Snap for 10453563 from 72852e8c2a7cefa7fccb30178de813752c9c7bf7 to mainline-mediaprovider-releaseaml_mpr_341614010aml_mpr_341511070aml_mpr_341411070aml_mpr_341313030aml_mpr_341111030aml_mpr_341111020aml_mpr_341015090aml_mpr_341015030aml_mpr_340919000android14-mainline-mediaprovider-release

Change-Id: I80467ca967b9a074fc7cbb2b2f8d58f4478321ab

103 files changed, 26171 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..39a013b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,18 @@
+# SPDX-License-Identifier: GPL-2.0-only
+TRACEEVENT-CFLAGS
+libtraceevent-dynamic-list
+libtraceevent.so.*
+.pc
+patches
+*.o
+build_prefix
+build_uninstall
+*~
+\#*\#
+.#*
+*.cmd
+*.so
+.*.d
+ep_version.h
+libtraceevent.pc
+lib/
diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..649e64a
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,53 @@
+package {
+    default_applicable_licenses: ["external_libtraceevent_license"],
+}
+
+// See: http://go/android-license-faq
+license {
+    name: "external_libtraceevent_license",
+
+    visibility: [":__subpackages__"],
+
+    license_kinds: [
+        "SPDX-license-identifier-GPL-2.0",
+        "SPDX-license-identifier-GPL-2.0-only",
+        "SPDX-license-identifier-GPL-2.0+",
+        "SPDX-license-identifier-GPL-2.0-or-later",
+        "SPDX-license-identifier-LGPL-2.1",
+        "SPDX-license-identifier-LGPL-2.1+",
+    ],
+
+    license_text: [
+        "LICENSE",
+    ],
+}
+
+cc_library {
+    name: "libtraceevent",
+
+    // Restrict visibility due to GPL license
+    visibility: [
+        "//external/libtracefs:__subpackages__",
+        "//external/trace-cmd:__subpackages__",
+    ],
+
+    local_include_dirs: [
+        "include/traceevent",
+        "include",
+        "src",
+    ],
+
+    export_include_dirs: [
+        "include/traceevent",
+    ],
+
+    srcs: ["src/*.c"],
+
+    cflags: [
+        "-D_GNU_SOURCE",
+        "-Wno-unused-parameter",
+        "-Wno-pointer-arith",
+    ],
+
+    c_std: "gnu99",
+}
diff --git a/Documentation/.gitignore b/Documentation/.gitignore
new file mode 100644
index 0000000..bdc8252
--- /dev/null
+++ b/Documentation/.gitignore
@@ -0,0 +1,3 @@
+*.m
+*.3
+*.html
diff --git a/Documentation/Makefile b/Documentation/Makefile
new file mode 100644
index 0000000..39f2be4
--- /dev/null
+++ b/Documentation/Makefile
@@ -0,0 +1,221 @@
+include ../scripts/utilities.mak
+include ../scripts/utils.mk
+
+# This Makefile and manpage XSL files were taken from tools/perf/Documentation
+# and modified for libtraceevent.
+
+MAN3_TXT= \
+	$(wildcard libtraceevent-*.txt) \
+	libtraceevent.txt
+
+MAN_TXT = $(MAN3_TXT)
+_MAN_XML=$(patsubst %.txt,%.xml,$(MAN_TXT))
+_MAN_HTML=$(patsubst %.txt,%.html,$(MAN_TXT))
+_DOC_MAN3=$(patsubst %.txt,%.m,$(MAN3_TXT))
+
+OUTPUT		:= $(obj)/Documentation/
+
+MAN_XML=$(addprefix $(OUTPUT),$(_MAN_XML))
+MAN_HTML=$(addprefix $(OUTPUT),$(_MAN_HTML))
+DOC_MAN3=$(addprefix $(OUTPUT),$(_DOC_MAN3))
+
+# Make the path relative to DESTDIR, not prefix
+ifndef DESTDIR
+prefix?=$(HOME)
+endif
+bindir?=$(prefix)/bin
+htmldir?=$(prefix)/share/doc/libtraceevent-doc
+pdfdir?=$(prefix)/share/doc/libtraceevent-doc
+mandir?=$(prefix)/share/man
+man3dir=$(mandir)/man3
+
+ASCIIDOC=asciidoc
+ASCIIDOC_EXTRA = --unsafe -f asciidoc.conf
+ASCIIDOC_HTML = xhtml11
+MANPAGE_XSL = manpage-normal.xsl
+XMLTO_EXTRA =
+INSTALL?=install
+RM ?= rm -f
+
+ifdef USE_ASCIIDOCTOR
+ASCIIDOC = asciidoctor
+ASCIIDOC_EXTRA = -a compat-mode
+ASCIIDOC_EXTRA += -I. -rasciidoctor-extensions
+ASCIIDOC_EXTRA += -a mansource="libtraceevent" -a manmanual="libtraceevent Manual"
+ASCIIDOC_HTML = xhtml5
+endif
+
+XMLTO=xmlto
+
+_tmp_tool_path := $(call get-executable,$(ASCIIDOC))
+ifeq ($(_tmp_tool_path),)
+	missing_tools = $(ASCIIDOC)
+endif
+
+ifndef USE_ASCIIDOCTOR
+_tmp_tool_path := $(call get-executable,$(XMLTO))
+ifeq ($(_tmp_tool_path),)
+	missing_tools += $(XMLTO)
+endif
+endif
+
+#
+# For asciidoc ...
+#	-7.1.2,	no extra settings are needed.
+#	8.0-,	set ASCIIDOC8.
+#
+
+#
+# For docbook-xsl ...
+#	-1.68.1,	set ASCIIDOC_NO_ROFF? (based on changelog from 1.73.0)
+#	1.69.0,		no extra settings are needed?
+#	1.69.1-1.71.0,	set DOCBOOK_SUPPRESS_SP?
+#	1.71.1,		no extra settings are needed?
+#	1.72.0,		set DOCBOOK_XSL_172.
+#	1.73.0-,	set ASCIIDOC_NO_ROFF
+#
+
+#
+# If you had been using DOCBOOK_XSL_172 in an attempt to get rid
+# of 'the ".ft C" problem' in your generated manpages, and you
+# instead ended up with weird characters around callouts, try
+# using ASCIIDOC_NO_ROFF instead (it works fine with ASCIIDOC8).
+#
+
+ifdef ASCIIDOC8
+ASCIIDOC_EXTRA += -a asciidoc7compatible
+endif
+ifdef DOCBOOK_XSL_172
+ASCIIDOC_EXTRA += -a libtraceevent-asciidoc-no-roff
+MANPAGE_XSL = manpage-1.72.xsl
+else
+	ifdef ASCIIDOC_NO_ROFF
+	# docbook-xsl after 1.72 needs the regular XSL, but will not
+	# pass-thru raw roff codes from asciidoc.conf, so turn them off.
+	ASCIIDOC_EXTRA += -a libtraceevent-asciidoc-no-roff
+	endif
+endif
+ifdef MAN_BOLD_LITERAL
+XMLTO_EXTRA += -m manpage-bold-literal.xsl
+endif
+ifdef DOCBOOK_SUPPRESS_SP
+XMLTO_EXTRA += -m manpage-suppress-sp.xsl
+endif
+
+SHELL_PATH ?= $(SHELL)
+# Shell quote;
+SHELL_PATH_SQ = $(subst ','\'',$(SHELL_PATH))
+
+DESTDIR ?=
+DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
+
+export DESTDIR DESTDIR_SQ
+
+#
+# Please note that there is a minor bug in asciidoc.
+# The version after 6.0.3 _will_ include the patch found here:
+#   http://marc.theaimsgroup.com/?l=libtraceevent&m=111558757202243&w=2
+#
+# Until that version is released you may have to apply the patch
+# yourself - yes, all 6 characters of it!
+#
+QUIET_SUBDIR0  = +$(MAKE) -C # space to separate -C and subdir
+QUIET_SUBDIR1  =
+
+ifneq ($(findstring $(MAKEFLAGS),w),w)
+PRINT_DIR = --no-print-directory
+else # "make -w"
+NO_SUBDIR = :
+endif
+
+ifneq ($(findstring $(MAKEFLAGS),s),s)
+ifneq ($(V),1)
+	QUIET_ASCIIDOC	= @echo '  ASCIIDOC '$@;
+	QUIET_XMLTO	= @echo '  XMLTO    '$@;
+	QUIET_SUBDIR0	= +@subdir=
+	QUIET_SUBDIR1	= ;$(NO_SUBDIR) \
+			   echo '  SUBDIR   ' $$subdir; \
+			  $(MAKE) $(PRINT_DIR) -C $$subdir
+	export V
+endif
+endif
+
+all: html man
+
+man: man3
+man3: $(DOC_MAN3)
+
+html: $(MAN_HTML)
+
+$(MAN_HTML) $(DOC_MAN3): asciidoc.conf
+
+install: install-man install-html
+
+check-man-tools:
+ifdef missing_tools
+	$(error "You need to install $(missing_tools) for man pages")
+endif
+
+$(OUTPUT)install-%.3: $(OUTPUT)%.3
+	$(Q)$(call do_install,$<,$(man3dir),644)
+
+do-install-man: man $(patsubst $(OUTPUT)%,$(OUTPUT)install-%,$(wildcard $(OUTPUT)*.3))
+
+install-man: check-man-tools man
+	$(Q)$(MAKE) -C . do-install-man
+
+install-%.txt: $(OUTPUT)%.html
+	$(Q)$(call do_install,$<,$(htmldir),644)
+
+do-install-html: html $(addprefix install-,$(wildcard *.txt))
+
+install-html: check-man-tools html do-install-html
+
+uninstall: uninstall-man uninstall-html
+
+uninstall-man:
+	$(call QUIET_UNINST, Documentation-man) \
+		$(Q)$(RM) $(addprefix $(DESTDIR)$(man3dir)/,$(DOC_MAN3))
+
+uninstall-html:
+	$(call QUIET_UNINST, Documentation-html) \
+		$(Q)$(RM) $(addprefix $(DESTDIR)$(htmldir)/,$(MAN_HTML))
+
+ifdef missing_tools
+  DO_INSTALL_MAN = $(warning Please install $(missing_tools) to have the man pages installed)
+else
+  DO_INSTALL_MAN = do-install-man
+endif
+
+CLEAN_FILES =					\
+	$(MAN_XML) $(addsuffix +,$(MAN_XML))	\
+	$(MAN_HTML) $(addsuffix +,$(MAN_HTML))	\
+	$(DOC_MAN3) $(OUTPUT)*.3 $(OUTPUT)*.m
+
+clean:
+	$(call QUIET_CLEAN, Documentation) $(RM) $(CLEAN_FILES)
+
+ifdef USE_ASCIIDOCTOR
+$(OUTPUT)%.3 : $(OUTPUT)%.txt
+	$(QUIET_ASCIIDOC)$(RM) $@+ $@ && \
+	$(ASCIIDOC) -b manpage -d manpage \
+		$(ASCIIDOC_EXTRA) -alibtraceevent_version=$(EVENT_PARSE_VERSION) -o $@+ $< && \
+	mv $@+ $@
+endif
+
+$(OUTPUT)%.m : $(OUTPUT)%.xml
+	$(QUIET_XMLTO)$(RM) $@ && \
+	$(XMLTO) -o $(OUTPUT). -m $(MANPAGE_XSL) $(XMLTO_EXTRA) man $<; \
+	touch $@
+
+$(OUTPUT)%.xml : %.txt
+	$(QUIET_ASCIIDOC)$(RM) $@+ $@ && \
+	$(ASCIIDOC) -b docbook -d manpage \
+		$(ASCIIDOC_EXTRA) -alibtraceevent_version=$(EVENT_PARSE_VERSION) -o $@+ $< && \
+	mv $@+ $@
+
+$(MAN_HTML): $(OUTPUT)%.html : %.txt
+	$(QUIET_ASCIIDOC)$(RM) $@+ $@ && \
+	$(ASCIIDOC) -b $(ASCIIDOC_HTML) -d manpage \
+		$(ASCIIDOC_EXTRA) -alibtraceevent_version=$(EVENT_PARSE_VERSION) -o $@+ $< && \
+	mv $@+ $@
diff --git a/Documentation/asciidoc.conf b/Documentation/asciidoc.conf
new file mode 100644
index 0000000..0759571
--- /dev/null
+++ b/Documentation/asciidoc.conf
@@ -0,0 +1,120 @@
+## linktep: macro
+#
+# Usage: linktep:command[manpage-section]
+#
+# Note, {0} is the manpage section, while {target} is the command.
+#
+# Show TEP link as: <command>(<section>); if section is defined, else just show
+# the command.
+
+[macros]
+(?su)[\\]?(?P<name>linktep):(?P<target>\S*?)\[(?P<attrlist>.*?)\]=
+
+[attributes]
+asterisk=&#42;
+plus=&#43;
+caret=&#94;
+startsb=&#91;
+endsb=&#93;
+tilde=&#126;
+
+ifdef::backend-docbook[]
+[linktep-inlinemacro]
+{0%{target}}
+{0#<citerefentry>}
+{0#<refentrytitle>{target}</refentrytitle><manvolnum>{0}</manvolnum>}
+{0#</citerefentry>}
+endif::backend-docbook[]
+
+ifdef::backend-docbook[]
+ifndef::tep-asciidoc-no-roff[]
+# "unbreak" docbook-xsl v1.68 for manpages. v1.69 works with or without this.
+# v1.72 breaks with this because it replaces dots not in roff requests.
+[listingblock]
+<example><title>{title}</title>
+<literallayout>
+ifdef::doctype-manpage[]
+&#10;.ft C&#10;
+endif::doctype-manpage[]
+|
+ifdef::doctype-manpage[]
+&#10;.ft&#10;
+endif::doctype-manpage[]
+</literallayout>
+{title#}</example>
+endif::tep-asciidoc-no-roff[]
+
+ifdef::tep-asciidoc-no-roff[]
+ifdef::doctype-manpage[]
+# The following two small workarounds insert a simple paragraph after screen
+[listingblock]
+<example><title>{title}</title>
+<literallayout>
+|
+</literallayout><simpara></simpara>
+{title#}</example>
+
+[verseblock]
+<formalpara{id? id="{id}"}><title>{title}</title><para>
+{title%}<literallayout{id? id="{id}"}>
+{title#}<literallayout>
+|
+</literallayout>
+{title#}</para></formalpara>
+{title%}<simpara></simpara>
+endif::doctype-manpage[]
+endif::tep-asciidoc-no-roff[]
+endif::backend-docbook[]
+
+ifdef::doctype-manpage[]
+ifdef::backend-docbook[]
+[header]
+template::[header-declarations]
+<refentry>
+<refmeta>
+<refentrytitle>{mantitle}</refentrytitle>
+<manvolnum>{manvolnum}</manvolnum>
+<refmiscinfo class="source">libtraceevent</refmiscinfo>
+<refmiscinfo class="version">{libtraceevent_version}</refmiscinfo>
+<refmiscinfo class="manual">libtraceevent Manual</refmiscinfo>
+</refmeta>
+<refnamediv>
+  <refname>{manname1}</refname>
+  <refname>{manname2}</refname>
+  <refname>{manname3}</refname>
+  <refname>{manname4}</refname>
+  <refname>{manname5}</refname>
+  <refname>{manname6}</refname>
+  <refname>{manname7}</refname>
+  <refname>{manname8}</refname>
+  <refname>{manname9}</refname>
+  <refname>{manname10}</refname>
+  <refname>{manname11}</refname>
+  <refname>{manname12}</refname>
+  <refname>{manname13}</refname>
+  <refname>{manname14}</refname>
+  <refname>{manname15}</refname>
+  <refname>{manname16}</refname>
+  <refname>{manname17}</refname>
+  <refname>{manname18}</refname>
+  <refname>{manname19}</refname>
+  <refname>{manname20}</refname>
+  <refname>{manname21}</refname>
+  <refname>{manname22}</refname>
+  <refname>{manname23}</refname>
+  <refname>{manname24}</refname>
+  <refname>{manname25}</refname>
+  <refname>{manname26}</refname>
+  <refname>{manname27}</refname>
+  <refname>{manname28}</refname>
+  <refname>{manname29}</refname>
+  <refname>{manname30}</refname>
+  <refpurpose>{manpurpose}</refpurpose>
+</refnamediv>
+endif::backend-docbook[]
+endif::doctype-manpage[]
+
+ifdef::backend-xhtml11[]
+[linktep-inlinemacro]
+<a href="{target}.html">{target}{0?({0})}</a>
+endif::backend-xhtml11[]
diff --git a/Documentation/libtraceevent-commands.txt b/Documentation/libtraceevent-commands.txt
new file mode 100644
index 0000000..cea3001
--- /dev/null
+++ b/Documentation/libtraceevent-commands.txt
@@ -0,0 +1,153 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_register_comm, tep_override_comm, tep_is_pid_registered,
+tep_data_comm_from_pid, tep_data_pid_from_comm, tep_cmdline_pid -
+Manage pid to process name mappings.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+int *tep_register_comm*(struct tep_handle pass:[*]_tep_, const char pass:[*]_comm_, int _pid_);
+int *tep_override_comm*(struct tep_handle pass:[*]_tep_, const char pass:[*]_comm_, int _pid_);
+bool *tep_is_pid_registered*(struct tep_handle pass:[*]_tep_, int _pid_);
+const char pass:[*]*tep_data_comm_from_pid*(struct tep_handle pass:[*]_pevent_, int _pid_);
+struct cmdline pass:[*]*tep_data_pid_from_comm*(struct tep_handle pass:[*]_pevent_, const char pass:[*]_comm_, struct cmdline pass:[*]_next_);
+int *tep_cmdline_pid*(struct tep_handle pass:[*]_pevent_, struct cmdline pass:[*]_cmdline_);
+--
+
+DESCRIPTION
+-----------
+These functions can be used to handle the mapping between pid and process name.
+The library builds a cache of these mappings, which is used to display the name
+of the process, instead of its pid. This information can be retrieved from
+tracefs/saved_cmdlines file.
+
+The *tep_register_comm()* function registers a _pid_ / process name mapping.
+If a command with the same _pid_ is already registered, an error is returned.
+The _pid_ argument is the process ID, the _comm_ argument is the process name,
+_tep_ is the event context. The _comm_ is duplicated internally.
+
+The *tep_override_comm()* function registers a _pid_ / process name mapping.
+If a process with the same pid is already registered, the process name string is
+udapted with the new one. The _pid_ argument is the process ID, the _comm_
+argument is the process name, _tep_ is the event context. The _comm_ is
+duplicated internally.
+
+The *tep_is_pid_registered()* function checks if a pid has a process name
+mapping registered. The _pid_ argument is the process ID, _tep_ is the event
+context.
+
+The *tep_data_comm_from_pid()* function returns the process name for a given
+pid. The _pid_ argument is the process ID, _tep_ is the event context.
+The returned string should not be freed, but will be freed when the _tep_
+handler is closed.
+
+The *tep_data_pid_from_comm()* function returns a pid for a given process name.
+The _comm_ argument is the process name, _tep_ is the event context.
+The argument _next_ is the cmdline structure to search for the next pid.
+As there may be more than one pid for a given process, the result of this call
+can be passed back into a recurring call in the _next_ parameter, to search for
+the next pid. If _next_ is NULL, it will return the first pid associated with
+the _comm_. The function performs a linear search, so it may be slow.
+
+The *tep_cmdline_pid()* function returns the pid associated with a given
+_cmdline_. The _tep_ argument is the event context.
+
+RETURN VALUE
+------------
+*tep_register_comm()* function returns 0 on success. In case of an error -1 is
+returned and errno is set to indicate the cause of the problem: ENOMEM, if there
+is not enough memory to duplicate the _comm_ or EEXIST if a mapping for this
+_pid_ is already registered.
+
+*tep_override_comm()* function returns 0 on success. In case of an error -1 is
+returned and errno is set to indicate the cause of the problem: ENOMEM, if there
+is not enough memory to duplicate the _comm_.
+
+*tep_is_pid_registered()* function returns true if the _pid_ has a process name
+mapped to it, false otherwise.
+
+*tep_data_comm_from_pid()* function returns the process name as string, or the
+string "<...>" if there is no mapping for the given pid.
+
+*tep_data_pid_from_comm()* function returns a pointer to a struct cmdline, that
+holds a pid for a given process, or NULL if none is found. This result can be
+passed back into a recurring call as the _next_ parameter of the function.
+
+*tep_cmdline_pid()* functions returns the pid for the give cmdline. If _cmdline_
+ is NULL, then -1 is returned.
+
+EXAMPLE
+-------
+The following example registers pid for command "ls", in context of event _tep_
+and performs various searches for pid / process name mappings:
+[source,c]
+--
+#include <event-parse.h>
+...
+int ret;
+int ls_pid = 1021;
+struct tep_handle *tep = tep_alloc();
+...
+	ret = tep_register_comm(tep, "ls", ls_pid);
+	if (ret != 0 && errno == EEXIST)
+		ret = tep_override_comm(tep, "ls", ls_pid);
+	if (ret != 0) {
+		/* Failed to register pid / command mapping */
+	}
+...
+	if (tep_is_pid_registered(tep, ls_pid) == 0) {
+		/* Command mapping for ls_pid is not registered */
+	}
+...
+	const char *comm = tep_data_comm_from_pid(tep, ls_pid);
+	if (comm) {
+		/* Found process name for ls_pid */
+	}
+...
+	int pid;
+	struct cmdline *cmd = tep_data_pid_from_comm(tep, "ls", NULL);
+	while (cmd) {
+		pid = tep_cmdline_pid(tep, cmd);
+		/* Found pid for process "ls" */
+		cmd = tep_data_pid_from_comm(tep, "ls", cmd);
+	}
+--
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-cpus.txt b/Documentation/libtraceevent-cpus.txt
new file mode 100644
index 0000000..aff4223
--- /dev/null
+++ b/Documentation/libtraceevent-cpus.txt
@@ -0,0 +1,77 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_get_cpus, tep_set_cpus - Get / set the number of CPUs, which have a tracing
+buffer representing it. Note, the buffer may be empty.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+int *tep_get_cpus*(struct tep_handle pass:[*]_tep_);
+void *tep_set_cpus*(struct tep_handle pass:[*]_tep_, int _cpus_);
+--
+
+DESCRIPTION
+-----------
+The *tep_get_cpus()* function gets the number of CPUs, which have a tracing
+buffer representing it. The _tep_ argument is trace event parser context.
+
+The *tep_set_cpus()* function sets the number of CPUs, which have a tracing
+buffer representing it. The _tep_ argument is trace event parser context.
+The _cpu_ argument is the number of CPUs with tracing data.
+
+RETURN VALUE
+------------
+The *tep_get_cpus()* functions returns the number of CPUs, which have tracing
+data recorded.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+	tep_set_cpus(tep, 5);
+...
+	printf("We have tracing data for %d CPUs", tep_get_cpus(tep));
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-debug.txt b/Documentation/libtraceevent-debug.txt
new file mode 100644
index 0000000..ff1d06d
--- /dev/null
+++ b/Documentation/libtraceevent-debug.txt
@@ -0,0 +1,95 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_print_printk, tep_print_funcs, tep_set_test_filters, tep_plugin_print_options -
+Print libtraceevent internal information.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+*#include <trace-seq.h>*
+
+void *tep_print_printk*(struct tep_handle pass:[*]tep);
+void *tep_print_funcs*(struct tep_handle pass:[*]tep);
+void *tep_set_test_filters*(struct tep_handle pass:[*]tep, int test_filters);
+void *tep_plugin_print_options*(struct trace_seq pass:[*]s);
+--
+
+DESCRIPTION
+-----------
+The *tep_print_printk()* function prints the printk string formats that were
+stored for this tracing session. The _tep_ argument is trace event parser context.
+
+The *tep_print_funcs()* function prints the stored function name to address mapping
+for this tracing session. The _tep_ argument is trace event parser context.
+
+The *tep_set_test_filters()* function sets a flag to test a filter string. If this
+flag is set, when *tep_filter_add_filter_str()* API as called, it will print the filter
+string instead of adding it. The _tep_ argument is trace event parser context.
+The _test_filters_ argument is the test flag that will be set.
+
+The *tep_plugin_print_options()* function writes a list of the registered plugin options
+into _s_.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+#include <trace-seq.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+	tep_print_printk(tep);
+...
+	tep_print_funcs(tep);
+...
+struct tep_event_filter *filter = tep_filter_alloc(tep);
+	tep_set_test_filters(tep, 1);
+	tep_filter_add_filter_str(filter, "sched/sched_wakeup:target_cpu==1");
+	tep_set_test_filters(tep, 0);
+	tep_filter_free(filter);
+...
+struct trace_seq seq;
+trace_seq_init(&seq);
+
+	tep_plugin_print_options(&s);
+...
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-endian_read.txt b/Documentation/libtraceevent-endian_read.txt
new file mode 100644
index 0000000..372d52a
--- /dev/null
+++ b/Documentation/libtraceevent-endian_read.txt
@@ -0,0 +1,78 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_read_number - Reads a number from raw data.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+unsigned long long *tep_read_number*(struct tep_handle pass:[*]_tep_, const void pass:[*]_ptr_, int _size_);
+--
+
+DESCRIPTION
+-----------
+The *tep_read_number()* function reads an integer from raw data, taking into
+account the endianness of the raw data and the current host. The _tep_ argument
+is the trace event parser context. The _ptr_ is a pointer to the raw data, where
+the integer is, and the _size_ is the size of the integer.
+
+RETURN VALUE
+------------
+The *tep_read_number()* function returns the integer in the byte order of
+the current host. In case of an error, 0 is returned.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+void process_record(struct tep_record *record)
+{
+	int offset = 24;
+	int data = tep_read_number(tep, record->data + offset, 4);
+
+	/* Read the 4 bytes at the offset 24 of data as an integer */
+}
+...
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-event_find.txt b/Documentation/libtraceevent-event_find.txt
new file mode 100644
index 0000000..56d76b1
--- /dev/null
+++ b/Documentation/libtraceevent-event_find.txt
@@ -0,0 +1,103 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_find_event,tep_find_event_by_name,tep_find_event_by_record -
+Find events by given key.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+struct tep_event pass:[*]*tep_find_event*(struct tep_handle pass:[*]_tep_, int _id_);
+struct tep_event pass:[*]*tep_find_event_by_name*(struct tep_handle pass:[*]_tep_, const char pass:[*]_sys_, const char pass:[*]_name_);
+struct tep_event pass:[*]*tep_find_event_by_record*(struct tep_handle pass:[*]_tep_, struct tep_record pass:[*]_record_);
+--
+
+DESCRIPTION
+-----------
+This set of functions can be used to search for an event, based on a given
+criteria. All functions require a pointer to a _tep_, trace event parser
+context.
+
+The *tep_find_event()* function searches for an event by given event _id_. The
+event ID is assigned dynamically and can be viewed in event's format file,
+"ID" field.
+
+The *tep_find_event_by_name()* function searches for an event by given
+event _name_, under the system _sys_. If the _sys_ is NULL (not specified),
+the first event with _name_ is returned.
+
+The tep_find_event_by_record()* function searches for an event from a given
+_record_.
+
+RETURN VALUE
+------------
+All these functions return a pointer to the found event, or NULL if there is no
+such event.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+struct tep_event *event;
+
+event = tep_find_event(tep, 1857);
+if (event == NULL) {
+	/* There is no event with ID 1857 */
+}
+
+event = tep_find_event_by_name(tep, "kvm", "kvm_exit");
+if (event == NULL) {
+	/* There is no kvm_exit event, from kvm system */
+}
+
+void event_from_record(struct tep_record *record)
+{
+ struct tep_event *event = tep_find_event_by_record(tep, record);
+	if (event == NULL) {
+		/* There is no event from given record */
+	}
+}
+...
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-event_get.txt b/Documentation/libtraceevent-event_get.txt
new file mode 100644
index 0000000..488f176
--- /dev/null
+++ b/Documentation/libtraceevent-event_get.txt
@@ -0,0 +1,99 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_get_event, tep_get_first_event, tep_get_events_count - Access events.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+struct tep_event pass:[*]*tep_get_event*(struct tep_handle pass:[*]_tep_, int _index_);
+struct tep_event pass:[*]*tep_get_first_event*(struct tep_handle pass:[*]_tep_);
+int *tep_get_events_count*(struct tep_handle pass:[*]_tep_);
+--
+
+DESCRIPTION
+-----------
+The *tep_get_event()* function returns a pointer to event at the given _index_.
+The _tep_ argument is trace event parser context, the _index_ is the index of
+the requested event.
+
+The *tep_get_first_event()* function returns a pointer to the first event.
+As events are stored in an array, this function returns the pointer to the
+beginning of the array. The _tep_ argument is trace event parser context.
+
+The *tep_get_events_count()* function returns the number of the events
+in the array. The _tep_ argument is trace event parser context.
+
+RETURN VALUE
+------------
+The *tep_get_event()* returns a pointer to the event located at _index_.
+NULL is returned in case of error, in case there are no events or _index_ is
+out of range.
+
+The *tep_get_first_event()* returns a pointer to the first event. NULL is
+returned in case of error, or in case there are no events.
+
+The *tep_get_events_count()* returns the number of the events. 0 is
+returned in case of error, or in case there are no events.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+int i,count = tep_get_events_count(tep);
+struct tep_event *event, *events = tep_get_first_event(tep);
+
+if (events == NULL) {
+	/* There are no events */
+} else {
+	for (i = 0; i < count; i++) {
+		event = (events+i);
+		/* process events[i] */
+	}
+
+	/* Get the last event */
+	event = tep_get_event(tep, count-1);
+}
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-event_list.txt b/Documentation/libtraceevent-event_list.txt
new file mode 100644
index 0000000..a958b18
--- /dev/null
+++ b/Documentation/libtraceevent-event_list.txt
@@ -0,0 +1,122 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_list_events, tep_list_events_copy -
+Get list of events, sorted by given criteria.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+enum *tep_event_sort_type* {
+	_TEP_EVENT_SORT_ID_,
+	_TEP_EVENT_SORT_NAME_,
+	_TEP_EVENT_SORT_SYSTEM_,
+};
+
+struct tep_event pass:[*]pass:[*]*tep_list_events*(struct tep_handle pass:[*]_tep_, enum tep_event_sort_type _sort_type_);
+struct tep_event pass:[*]pass:[*]*tep_list_events_copy*(struct tep_handle pass:[*]_tep_, enum tep_event_sort_type _sort_type_);
+--
+
+DESCRIPTION
+-----------
+The *tep_list_events()* function returns an array of pointers to the events,
+sorted by the _sort_type_ criteria. The last element of the array is NULL.
+The returned memory must not be freed, it is managed by the library.
+The function is not thread safe. The _tep_ argument is trace event parser
+context. The _sort_type_ argument is the required sort criteria:
+[verse]
+--
+	_TEP_EVENT_SORT_ID_	- sort by the event ID.
+	_TEP_EVENT_SORT_NAME_	- sort by the event (name, system, id) triplet.
+	_TEP_EVENT_SORT_SYSTEM_	- sort by the event (system, name, id) triplet.
+--
+
+The *tep_list_events_copy()* is a thread safe version of _tep_list_events()_.
+It has the same behavior, but the returned array is allocated internally and
+must be freed by the caller. Note that the content of the array must not be
+freed (see the EXAMPLE below).
+
+RETURN VALUE
+------------
+The *tep_list_events()* function returns an array of pointers to events.
+In case of an error, NULL is returned. The returned array must not be freed,
+it is managed by the library.
+
+The *tep_list_events_copy()* function returns an array of pointers to events.
+In case of an error, NULL is returned. The returned array must be freed by
+the caller.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+int i;
+struct tep_event_format **events;
+
+i=0;
+events = tep_list_events(tep, TEP_EVENT_SORT_ID);
+if (events == NULL) {
+	/* Failed to get the events, sorted by ID */
+} else {
+	while(events[i]) {
+		/* walk through the list of the events, sorted by ID */
+		i++;
+	}
+}
+
+i=0;
+events = tep_list_events_copy(tep, TEP_EVENT_SORT_NAME);
+if (events == NULL) {
+	/* Failed to get the events, sorted by name */
+} else {
+	while(events[i]) {
+		/* walk through the list of the events, sorted by name */
+		i++;
+	}
+	free(events);
+}
+
+...
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-event_print.txt b/Documentation/libtraceevent-event_print.txt
new file mode 100644
index 0000000..6a5946a
--- /dev/null
+++ b/Documentation/libtraceevent-event_print.txt
@@ -0,0 +1,130 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_print_event - Writes event information into a trace sequence.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+*#include <trace-seq.h>*
+
+void *tep_print_event*(struct tep_handle pass:[*]_tep_, struct trace_seqpass:[*]_s_, struct tep_record pass:[*]_record_, const char pass:[*]_fmt_, _..._)
+--
+
+DESCRIPTION
+-----------
+
+The *tep_print_event()* function parses the event information of the given
+_record_ and writes it into the trace sequence _s_, according to the format
+string _fmt_. The desired information is specified after the format string.
+The _fmt_ is printf-like format string, following arguments are supported:
+[verse]
+--
+	TEP_PRINT_PID, "%d"  - PID of the event.
+	TEP_PRINT_CPU, "%d"  - Event CPU.
+	TEP_PRINT_COMM, "%s" - Event command string.
+	TEP_PRINT_NAME, "%s" - Event name.
+	TEP_PRINT_LATENCY, "%s" - Latency of the event. It prints 4 or more
+			fields - interrupt state, scheduling state,
+			current context, and preemption count.
+			Field 1 is the interrupt enabled state:
+				d : Interrupts are disabled
+				. : Interrupts are enabled
+				X : The architecture does not support this
+				    information
+			Field 2 is the "need resched" state.
+				N : The task is set to call the scheduler when
+				    possible, as another higher priority task
+				    may need to be scheduled in.
+				. : The task is not set to call the scheduler.
+			Field 3 is the context state.
+				. : Normal context
+				s : Soft interrupt context
+				h : Hard interrupt context
+				H : Hard interrupt context which triggered
+				    during soft interrupt context.
+				z : NMI context
+				Z : NMI context which triggered during hard
+				    interrupt context
+			Field 4 is the preemption count.
+				. : The preempt count is zero.
+			On preemptible kernels (where the task can be scheduled
+			out in arbitrary locations while in kernel context), the
+			preempt count, when non zero, will prevent the kernel
+			from scheduling out the current task. The preempt count
+			number is displayed when it is not zero.
+			Depending on the kernel, it may show other fields
+			(lock depth, or migration disabled, which are unique to
+			specialized kernels).
+	TEP_PRINT_TIME, %d - event time stamp. A divisor and precision can be
+			specified as part of this format string:
+			"%precision.divisord". Example:
+			"%3.1000d" - divide the time by 1000 and print the first
+			3 digits before the dot. Thus, the time stamp
+			"123456000" will be printed as "123.456"
+	TEP_PRINT_INFO, "%s" - event information.
+	TEP_PRINT_INFO_RAW, "%s" - event information, in raw format.
+
+--
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+#include <trace-seq.h>
+...
+struct trace_seq seq;
+trace_seq_init(&seq);
+struct tep_handle *tep = tep_alloc();
+...
+void print_my_event(struct tep_record *record)
+{
+	trace_seq_reset(&seq);
+	tep_print_event(tep, s, record, "%16s-%-5d [%03d] %s %6.1000d %s %s",
+			TEP_PRINT_COMM, TEP_PRINT_PID, TEP_PRINT_CPU,
+			TEP_PRINT_LATENCY, TEP_PRINT_TIME, TEP_PRINT_NAME,
+			TEP_PRINT_INFO);
+}
+...
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*trace-seq.h*
+	Header file to include in order to have access to trace sequences related APIs.
+	Trace sequences are used to allow a function to call several other functions
+	to create a string of data to use.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-field_find.txt b/Documentation/libtraceevent-field_find.txt
new file mode 100644
index 0000000..5e4071c
--- /dev/null
+++ b/Documentation/libtraceevent-field_find.txt
@@ -0,0 +1,118 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_find_common_field, tep_find_field, tep_find_any_field -
+Search for a field in an event.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+struct tep_format_field pass:[*]*tep_find_common_field*(struct tep_event pass:[*]_event_, const char pass:[*]_name_);
+struct tep_format_field pass:[*]*tep_find_field*(struct tep_event_ormat pass:[*]_event_, const char pass:[*]_name_);
+struct tep_format_field pass:[*]*tep_find_any_field*(struct tep_event pass:[*]_event_, const char pass:[*]_name_);
+--
+
+DESCRIPTION
+-----------
+These functions search for a field with given name in an event. The field
+returned can be used to find the field content from within a data record.
+
+The *tep_find_common_field()* function searches for a common field with _name_
+in the _event_.
+
+The *tep_find_field()* function searches for an event specific field with
+_name_ in the _event_.
+
+The *tep_find_any_field()* function searches for any field with _name_ in the
+_event_.
+
+RETURN VALUE
+------------
+The _tep_find_common_field(), *tep_find_field()* and _tep_find_any_field()_
+functions return a pointer to the found field, or NULL in case there is no field
+with the requested name.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+void get_htimer_info(struct tep_handle *tep, struct tep_record *record)
+{
+	struct tep_format_field *field;
+	struct tep_event *event;
+	long long softexpires;
+	int mode;
+	int pid;
+
+	event = tep_find_event_by_name(tep, "timer", "hrtimer_start");
+
+	field = tep_find_common_field(event, "common_pid");
+	if (field == NULL) {
+		/* Cannot find "common_pid" field in the event */
+	} else {
+		/* Get pid from the data record */
+		pid = tep_read_number(tep, record->data + field->offset,
+				      field->size);
+	}
+
+	field = tep_find_field(event, "softexpires");
+	if (field == NULL) {
+		/* Cannot find "softexpires" event specific field in the event */
+	} else {
+		/* Get softexpires parameter from the data record */
+		softexpires = tep_read_number(tep, record->data + field->offset,
+					      field->size);
+	}
+
+	field = tep_find_any_field(event, "mode");
+	if (field == NULL) {
+		/* Cannot find "mode" field in the event */
+	} else
+	{
+		/* Get mode parameter from the data record */
+		mode = tep_read_number(tep, record->data + field->offset,
+				       field->size);
+	}
+}
+...
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-field_get_val.txt b/Documentation/libtraceevent-field_get_val.txt
new file mode 100644
index 0000000..6a5f1cd
--- /dev/null
+++ b/Documentation/libtraceevent-field_get_val.txt
@@ -0,0 +1,122 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_get_any_field_val, tep_get_common_field_val, tep_get_field_val,
+tep_get_field_raw - Get value of a field.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+*#include <trace-seq.h>*
+
+int *tep_get_any_field_val*(struct trace_seq pass:[*]_s_, struct tep_event pass:[*]_event_, const char pass:[*]_name_, struct tep_record pass:[*]_record_, unsigned long long pass:[*]_val_, int _err_);
+int *tep_get_common_field_val*(struct trace_seq pass:[*]_s_, struct tep_event pass:[*]_event_, const char pass:[*]_name_, struct tep_record pass:[*]_record_, unsigned long long pass:[*]_val_, int _err_);
+int *tep_get_field_val*(struct trace_seq pass:[*]_s_, struct tep_event pass:[*]_event_, const char pass:[*]_name_, struct tep_record pass:[*]_record_, unsigned long long pass:[*]_val_, int _err_);
+void pass:[*]*tep_get_field_raw*(struct trace_seq pass:[*]_s_, struct tep_event pass:[*]_event_, const char pass:[*]_name_, struct tep_record pass:[*]_record_, int pass:[*]_len_, int _err_);
+--
+
+DESCRIPTION
+-----------
+These functions can be used to find a field and retrieve its value.
+
+The *tep_get_any_field_val()* function searches in the _record_ for a field
+with _name_, part of the _event_. If the field is found, its value is stored in
+_val_. If there is an error and _err_ is not zero, then an error string is
+written into _s_.
+
+The *tep_get_common_field_val()* function does the same as
+*tep_get_any_field_val()*, but searches only in the common fields. This works
+for any event as all events include the common fields.
+
+The *tep_get_field_val()* function does the same as *tep_get_any_field_val()*,
+but searches only in the event specific fields.
+
+The *tep_get_field_raw()* function searches in the _record_ for a field with
+_name_, part of the _event_. If the field is found, a pointer to where the field
+exists in the record's raw data is returned. The size of the data is stored in
+_len_. If there is an error and _err_ is not zero, then an error string is
+written into _s_.
+
+RETURN VALUE
+------------
+The *tep_get_any_field_val()*, *tep_get_common_field_val()* and
+*tep_get_field_val()* functions return 0 on success, or -1 in case of an error.
+
+The *tep_get_field_raw()* function returns a pointer to field's raw data, and
+places the length of this data in _len_. In case of an error NULL is returned.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+#include <trace-seq.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+struct tep_event *event = tep_find_event_by_name(tep, "kvm", "kvm_exit");
+...
+void process_record(struct tep_record *record)
+{
+	int len;
+	char *comm;
+	struct tep_event *event;
+	unsigned long long val;
+
+	event = tep_find_event_by_record(tep, record);
+	if (event != NULL) {
+		if (tep_get_common_field_val(NULL, event, "common_type",
+					     record, &val, 0) == 0) {
+			/* Got the value of common type field */
+		}
+		if (tep_get_field_val(NULL, event, "pid", record, &val, 0) == 0) {
+			/* Got the value of pid specific field */
+		}
+		comm = tep_get_field_raw(NULL, event, "comm", record, &len, 0);
+		if (comm != NULL) {
+			/* Got a pointer to the comm event specific field */
+		}
+	}
+}
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*trace-seq.h*
+	Header file to include in order to have access to trace sequences
+	related APIs. Trace sequences are used to allow a function to call
+	several other functions to create a string of data to use.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-field_print.txt b/Documentation/libtraceevent-field_print.txt
new file mode 100644
index 0000000..3844fd1
--- /dev/null
+++ b/Documentation/libtraceevent-field_print.txt
@@ -0,0 +1,135 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_print_field_content, tep_print_fields, tep_print_num_field, tep_print_func_field, tep_record_print_fields, tep_record_print_selected_fields -
+Print the field content.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+*#include <trace-seq.h>*
+
+void *tep_print_field_content*(struct trace_seq pass:[*]_s_, void pass:[*]_data_, int size, struct tep_format_field pass:[*]_field_);
+void *tep_print_fields*(struct trace_seq pass:[*]_s_, void pass:[*]_data_, int _size_, struct tep_event pass:[*]_event_);
+int *tep_print_num_field*(struct trace_seq pass:[*]_s_, const char pass:[*]_fmt_, struct tep_event pass:[*]_event_, const char pass:[*]_name_, struct tep_record pass:[*]_record_, int _err_);
+int *tep_print_func_field*(struct trace_seq pass:[*]_s_, const char pass:[*]_fmt_, struct tep_event pass:[*]_event_, const char pass:[*]_name_, struct tep_record pass:[*]_record_, int _err_);
+void *tep_record_print_fields*(struct trace_seq pass:[*]_s_, struct tep_record pass:[*]_record_, struct tep_event pass:[*]_event_);
+void *tep_record_print_selected_fields*(struct trace_seq pass:[*]_s_, struct tep_record pass:[*]_record_, struct tep_event pass:[*]_event_, int _select_mask_);
+--
+
+DESCRIPTION
+-----------
+These functions print recorded field's data, according to the field's type.
+
+The *tep_print_field_content()* function extracts from the recorded raw _data_ value of
+the _field_ and prints it into _s_, according to the field type.
+
+The *tep_print_fields()* prints each field name followed by the record's field
+value according to the field's type:
+[verse]
+--
+"field1_name=field1_value field2_name=field2_value ..."
+--
+It iterates all fields of the _event_, and calls *tep_print_field_content()* for each of
+them.
+
+The *tep_print_num_field()* function prints a numeric field with given format
+string. A search is performed in the _event_ for a field with _name_. If such
+field is found, its value is extracted from the _record_ and is printed in the
+_s_, according to the given format string _fmt_. If the argument _err_ is
+non-zero, and an error occures - it is printed in the _s_.
+
+The *tep_print_func_field()* function prints a function field with given format
+string.  A search is performed in the _event_ for a field with _name_. If such
+field is found, its value is extracted from the _record_. The value is assumed
+to be a function address, and a search is perform to find the name of this
+function. The function name (if found) and its address are printed in the _s_,
+according to the given format string _fmt_. If the argument _err_ is non-zero,
+and an error occures - it is printed in _s_.
+
+The *tep_record_print_fields()* prints the field's name followed by its value
+for all record's field.
+
+The *tep_record_print_selected_fields()* prints the field's name followed by
+its value for selected subset of record field. The fields to be printed are
+defined by the _select_mask_ bit mask.
+
+RETURN VALUE
+------------
+The *tep_print_num_field()* and *tep_print_func_field()* functions return 1
+on success, -1 in case of an error or 0 if the print buffer _s_ is full.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+#include <trace-seq.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+struct trace_seq seq;
+trace_seq_init(&seq);
+struct tep_event *event = tep_find_event_by_name(tep, "timer", "hrtimer_start");
+...
+void process_record(struct tep_record *record)
+{
+	struct tep_format_field *field_pid = tep_find_common_field(event, "common_pid");
+
+	trace_seq_reset(&seq);
+
+	/* Print the value of "common_pid" */
+	tep_print_field_content(&seq, record->data, record->size, field_pid);
+
+	/* Print all fields of the "hrtimer_start" event */
+	tep_print_fields(&seq, record->data, record->size, event);
+
+	/* Print the value of "expires" field with custom format string */
+	tep_print_num_field(&seq, " timer expires in %llu ", event, "expires", record, 0);
+
+	/* Print the address and the name of "function" field with custom format string */
+	tep_print_func_field(&seq, " timer function is %s ", event, "function", record, 0);
+ }
+ ...
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*trace-seq.h*
+	Header file to include in order to have access to trace sequences related APIs.
+	Trace sequences are used to allow a function to call several other functions
+	to create a string of data to use.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-field_read.txt b/Documentation/libtraceevent-field_read.txt
new file mode 100644
index 0000000..cc322fb
--- /dev/null
+++ b/Documentation/libtraceevent-field_read.txt
@@ -0,0 +1,81 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_read_number_field - Reads a number from raw data.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+int *tep_read_number_field*(struct tep_format_field pass:[*]_field_, const void pass:[*]_data_, unsigned long long pass:[*]_value_);
+--
+
+DESCRIPTION
+-----------
+The *tep_read_number_field()* function reads the value of the _field_ from the
+raw _data_ and stores it in the _value_. The function sets the _value_ according
+to the endianness of the raw data and the current machine and stores it in
+_value_.
+
+RETURN VALUE
+------------
+The *tep_read_number_field()* function retunrs 0 in case of success, or -1 in
+case of an error.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+struct tep_event *event = tep_find_event_by_name(tep, "timer", "hrtimer_start");
+...
+void process_record(struct tep_record *record)
+{
+	unsigned long long pid;
+	struct tep_format_field *field_pid = tep_find_common_field(event, "common_pid");
+
+	if (tep_read_number_field(field_pid, record->data, &pid) != 0) {
+		/* Failed to get "common_pid" value */
+	}
+}
+...
+--
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-fields.txt b/Documentation/libtraceevent-fields.txt
new file mode 100644
index 0000000..99b302f
--- /dev/null
+++ b/Documentation/libtraceevent-fields.txt
@@ -0,0 +1,105 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_event_common_fields, tep_event_fields - Get a list of fields for an event.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+struct tep_format_field pass:[*]pass:[*]*tep_event_common_fields*(struct tep_event pass:[*]_event_);
+struct tep_format_field pass:[*]pass:[*]*tep_event_fields*(struct tep_event pass:[*]_event_);
+--
+
+DESCRIPTION
+-----------
+The *tep_event_common_fields()* function returns an array of pointers to common
+fields for the _event_. The array is allocated in the function and must be freed
+by free(). The last element of the array is NULL.
+
+The *tep_event_fields()* function returns an array of pointers to event specific
+fields for the _event_. The array is allocated in the function and must be freed
+by free(). The last element of the array is NULL.
+
+RETURN VALUE
+------------
+Both *tep_event_common_fields()* and *tep_event_fields()* functions return
+an array of pointers to tep_format_field structures in case of success, or
+NULL in case of an error.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+int i;
+struct tep_format_field **fields;
+struct tep_event *event = tep_find_event_by_name(tep, "kvm", "kvm_exit");
+if (event != NULL) {
+	fields = tep_event_common_fields(event);
+	if (fields != NULL) {
+		i = 0;
+		while (fields[i]) {
+			/*
+			  walk through the list of the common fields
+			  of the kvm_exit event
+			*/
+			i++;
+		}
+		free(fields);
+	}
+	fields = tep_event_fields(event);
+	if (fields != NULL) {
+		i = 0;
+		while (fields[i]) {
+			/*
+			  walk through the list of the event specific
+			  fields of the kvm_exit event
+			*/
+			i++;
+		}
+		free(fields);
+	}
+}
+...
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-file_endian.txt b/Documentation/libtraceevent-file_endian.txt
new file mode 100644
index 0000000..4d13227
--- /dev/null
+++ b/Documentation/libtraceevent-file_endian.txt
@@ -0,0 +1,91 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_is_file_bigendian, tep_set_file_bigendian - Get / set the endianness of the
+raw data being accessed by the tep handler.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+enum *tep_endian* {
+	TEP_LITTLE_ENDIAN = 0,
+	TEP_BIG_ENDIAN
+};
+
+bool *tep_is_file_bigendian*(struct tep_handle pass:[*]_tep_);
+void *tep_set_file_bigendian*(struct tep_handle pass:[*]_tep_, enum tep_endian _endian_);
+
+--
+DESCRIPTION
+-----------
+The *tep_is_file_bigendian()* function gets the endianness of the raw data,
+being accessed by the tep handler. The _tep_ argument is trace event parser
+context.
+
+The *tep_set_file_bigendian()* function sets the endianness of raw data being
+accessed by the tep handler. The _tep_ argument is trace event parser context.
+[verse]
+--
+The _endian_ argument is the endianness:
+	_TEP_LITTLE_ENDIAN_ - the raw data is in little endian format,
+	_TEP_BIG_ENDIAN_ - the raw data is in big endian format.
+--
+RETURN VALUE
+------------
+The *tep_is_file_bigendian()* function returns true if the data is in bigendian
+format, false otherwise.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+	tep_set_file_bigendian(tep, TEP_LITTLE_ENDIAN);
+...
+	if (tep_is_file_bigendian(tep)) {
+		/* The raw data is in big endian */
+	} else {
+		/* The raw data is in little endian */
+	}
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-filter.txt b/Documentation/libtraceevent-filter.txt
new file mode 100644
index 0000000..f3eacf6
--- /dev/null
+++ b/Documentation/libtraceevent-filter.txt
@@ -0,0 +1,209 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_filter_alloc, tep_filter_free, tep_filter_reset, tep_filter_make_string,
+tep_filter_copy, tep_filter_compare, tep_filter_match, tep_event_filtered,
+tep_filter_remove_event, tep_filter_strerror, tep_filter_add_filter_str -
+Event filter related APIs.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+struct tep_event_filter pass:[*]*tep_filter_alloc*(struct tep_handle pass:[*]_tep_);
+void *tep_filter_free*(struct tep_event_filter pass:[*]_filter_);
+void *tep_filter_reset*(struct tep_event_filter pass:[*]_filter_);
+enum tep_errno *tep_filter_add_filter_str*(struct tep_event_filter pass:[*]_filter_, const char pass:[*]_filter_str_);
+int *tep_event_filtered*(struct tep_event_filter pass:[*]_filter_, int _event_id_);
+int *tep_filter_remove_event*(struct tep_event_filter pass:[*]_filter_, int _event_id_);
+enum tep_errno *tep_filter_match*(struct tep_event_filter pass:[*]_filter_, struct tep_record pass:[*]_record_);
+int *tep_filter_copy*(struct tep_event_filter pass:[*]_dest_, struct tep_event_filter pass:[*]_source_);
+int *tep_filter_compare*(struct tep_event_filter pass:[*]_filter1_, struct tep_event_filter pass:[*]_filter2_);
+char pass:[*]*tep_filter_make_string*(struct tep_event_filter pass:[*]_filter_, int _event_id_);
+int *tep_filter_strerror*(struct tep_event_filter pass:[*]_filter_, enum tep_errno _err_, char pass:[*]buf, size_t _buflen_);
+--
+
+DESCRIPTION
+-----------
+Filters can be attached to traced events. They can be used to filter out various
+events when outputting them. Each event can be filtered based on its parameters,
+described in the event's format file. This set of functions can be used to
+create, delete, modify and attach event filters.
+
+The *tep_filter_alloc()* function creates a new event filter. The _tep_ argument
+is the trace event parser context.
+
+The *tep_filter_free()* function frees an event filter and all resources that it
+had used.
+
+The *tep_filter_reset()* function removes all rules from an event filter and
+resets it.
+
+The *tep_filter_add_filter_str()* function adds a new rule to the _filter_. The
+_filter_str_ argument is the filter string, that contains the rule.
+
+The *tep_event_filtered()* function checks if the event with _event_id_ has
+_filter_.
+
+The *tep_filter_remove_event()* function removes a _filter_ for an event with
+_event_id_.
+
+The *tep_filter_match()* function tests if a _record_ matches given _filter_.
+
+The *tep_filter_copy()* function copies a _source_ filter into a _dest_ filter.
+
+The *tep_filter_compare()* function compares two filers - _filter1_ and _filter2_.
+
+The *tep_filter_make_string()* function constructs a string, displaying
+the _filter_ contents for given _event_id_.
+
+The *tep_filter_strerror()* function copies the _filter_ error buffer into the
+given _buf_ with the size _buflen_. If the error buffer is empty, in the _buf_
+is copied a string, describing the error _err_.
+
+RETURN VALUE
+------------
+The *tep_filter_alloc()* function returns a pointer to the newly created event
+filter, or NULL in case of an error.
+
+The *tep_filter_add_filter_str()* function returns 0 if the rule was
+successfully added or a negative error code.  Use *tep_filter_strerror()* to see
+actual error message in case of an error.
+
+The *tep_event_filtered()* function returns 1 if the filter is found for given
+event, or 0 otherwise.
+
+The *tep_filter_remove_event()* function returns 1 if the vent was removed, or
+0 if the event was not found.
+
+The *tep_filter_match()* function returns _tep_errno_, according to the result:
+[verse]
+--
+_pass:[TEP_ERRNO__FILTER_MATCH]_	- filter found for event, the record matches.
+_pass:[TEP_ERRNO__FILTER_MISS]_		- filter found for event, the record does not match.
+_pass:[TEP_ERRNO__FILTER_NOT_FOUND]_	- no filter found for record's event.
+_pass:[TEP_ERRNO__NO_FILTER]_		- no rules in the filter.
+--
+or any other _tep_errno_, if an error occurred during the test.
+
+The *tep_filter_copy()* function returns 0 on success or -1 if not all rules
+ were copied.
+
+The *tep_filter_compare()* function returns 1 if the two filters hold the same
+content, or 0 if they do not.
+
+The *tep_filter_make_string()* function returns a string, which must be freed
+with free(), or NULL in case of an error.
+
+The *tep_filter_strerror()* function returns 0 if message was filled
+successfully, or -1 in case of an error.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+char errstr[200];
+int ret;
+
+struct tep_event_filter *filter = tep_filter_alloc(tep);
+struct tep_event_filter *filter1 = tep_filter_alloc(tep);
+ret = tep_filter_add_filter_str(filter, "sched/sched_wakeup:target_cpu==1");
+if(ret < 0) {
+	tep_filter_strerror(filter, ret, errstr, sizeof(errstr));
+	/* Failed to add a new rule to the filter, the error string is in errstr */
+}
+if (tep_filter_copy(filter1, filter) != 0) {
+	/* Failed to copy filter in filter1 */
+}
+...
+if (tep_filter_compare(filter, filter1) != 1) {
+	/* Both filters are different */
+}
+...
+void process_record(struct tep_handle *tep, struct tep_record *record)
+{
+	struct tep_event *event;
+	char *fstring;
+
+	event = tep_find_event_by_record(tep, record);
+
+	if (tep_event_filtered(filter, event->id) == 1) {
+		/* The event has filter */
+		fstring = tep_filter_make_string(filter, event->id);
+		if (fstring != NULL) {
+			/* The filter for the event is in fstring */
+			free(fstring);
+		}
+	}
+
+	switch (tep_filter_match(filter, record)) {
+	case TEP_ERRNO__FILTER_MATCH:
+		/* The filter matches the record */
+		break;
+	case TEP_ERRNO__FILTER_MISS:
+		/* The filter does not match the record */
+		break;
+	case TEP_ERRNO__FILTER_NOT_FOUND:
+		/* No filter found for record's event */
+		break;
+	case TEP_ERRNO__NO_FILTER:
+		/* There are no rules in the filter */
+		break
+	default:
+		/* An error occurred during the test */
+		break;
+	}
+
+	if (tep_filter_remove_event(filter, event->id) == 1) {
+		/* The event was removed from the filter */
+	}
+}
+
+...
+tep_filter_reset(filter);
+...
+tep_filter_free(filter);
+tep_filter_free(filter1);
+...
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-func_apis.txt b/Documentation/libtraceevent-func_apis.txt
new file mode 100644
index 0000000..1b836a1
--- /dev/null
+++ b/Documentation/libtraceevent-func_apis.txt
@@ -0,0 +1,168 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_set_function_resolver, tep_reset_function_resolver, tep_register_function, tep_register_print_string,
+tep_get_function_count - function related tep APIs
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+typedef char pass:[*](*tep_func_resolver_t*)(void pass:[*]_priv_, unsigned long long pass:[*]_addrp_, char pass:[**]_modp_);
+int *tep_set_function_resolver*(struct tep_handle pass:[*]_tep_, tep_func_resolver_t pass:[*]_func_, void pass:[*]_priv_);
+void *tep_reset_function_resolver*(struct tep_handle pass:[*]_tep_);
+int *tep_register_function*(struct tep_handle pass:[*]_tep_, char pass:[*]_name_, unsigned long long _addr_, char pass:[*]_mod_);
+int *tep_register_print_string*(struct tep_handle pass:[*]_tep_, const char pass:[*]_fmt_, unsigned long long _addr_);
+int *tep_get_function_count*(struct tep_handle *_tep_)
+--
+
+DESCRIPTION
+-----------
+Some tools may have already a way to resolve the kernel functions. These APIs
+allow them to keep using it instead of duplicating all the entries inside.
+
+The _tep_func_resolver_t_ type is the prototype of the alternative kernel
+functions resolver. This function receives a pointer to its custom context
+(set with the *tep_set_function_resolver()* call ) and the address of a kernel
+function, which has to be resolved. In case of success, it should return
+the name of the function and its module (if any) in _modp_.
+
+The *tep_set_function_resolver()* function registers _func_ as an alternative
+kernel functions resolver. The _tep_ argument is trace event parser context.
+The _priv_ argument is a custom context of the _func_ function. The function
+resolver is used by the APIs *tep_find_function*(3),
+*tep_find_function_address*(3), and *tep_print_func_field()* to resolve
+a function address to a function name.
+
+The *tep_reset_function_resolver()* function resets the kernel functions
+resolver to the default function.  The _tep_ argument is trace event parser
+context.
+
+
+These APIs can be used to find function name and start address, by given
+address. The given address does not have to be exact, it will select
+the function that would contain it.
+
+The *tep_register_function()* function registers a function name mapped to an
+address and (optional) module. This mapping is used in case the function tracer
+or events have "%pS" parameter in its format string. It is common to pass in
+the kallsyms function names with their corresponding addresses with this
+function. The _tep_ argument is the trace event parser context. The _name_ is
+the name of the function, the string is copied internally. The _addr_ is the
+start address of the function. The _mod_ is the kernel module the function may
+be in (NULL for none).
+
+The *tep_register_print_string()* function  registers a string by the address
+it was stored in the kernel. Some strings internal to the kernel with static
+address are passed to certain events. The "%s" in the event's format field
+which has an address needs to know what string would be at that address. The
+tep_register_print_string() supplies the parsing with the mapping between kernel
+addresses and those strings. The _tep_ argument is the trace event parser
+context. The _fmt_ is the string to register, it is copied internally.
+The _addr_ is the address the string was located at.
+
+*tep_get_function_count*() returns the number of registered functions in a tep handler.
+
+RETURN VALUE
+------------
+The *tep_set_function_resolver()* function returns 0 in case of success, or -1
+in case of an error.
+
+The *tep_register_function()* function returns 0 in case of success. In case of
+an error -1 is returned, and errno is set to the appropriate error number.
+
+The *tep_register_print_string()* function returns 0 in case of success. In case
+of an error -1 is returned, and errno is set to the appropriate error number.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+char *my_resolve_kernel_addr(void *context,
+			     unsigned long long *addrp, char **modp)
+{
+	struct db *function_database = context;
+	struct symbol *sym = sql_lookup(function_database, *addrp);
+
+	if (!sym)
+		return NULL;
+
+	*modp = sym->module_name;
+	return sym->name;
+}
+
+void show_function( unsigned long long addr)
+{
+	unsigned long long fstart;
+	const char *fname;
+
+	if (tep_set_function_resolver(tep, my_resolve_kernel_addr,
+				      function_database) != 0) {
+		/* failed to register my_resolve_kernel_addr */
+	}
+
+	/* These APIs use my_resolve_kernel_addr() to resolve the addr */
+	fname = tep_find_function(tep, addr);
+	fstart = tep_find_function_address(tep, addr);
+
+	/*
+	   addr is in function named fname, starting at fstart address,
+	   at offset (addr - fstart)
+	*/
+
+	tep_reset_function_resolver(tep);
+
+}
+...
+	if (tep_register_function(tep, "kvm_exit",
+				(unsigned long long) 0x12345678, "kvm") != 0) {
+		/* Failed to register kvm_exit address mapping */
+	}
+...
+	if (tep_register_print_string(tep, "print string",
+				(unsigned long long) 0x87654321, NULL) != 0) {
+		/* Failed to register "print string" address mapping */
+	}
+...
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-func_find.txt b/Documentation/libtraceevent-func_find.txt
new file mode 100644
index 0000000..26fac68
--- /dev/null
+++ b/Documentation/libtraceevent-func_find.txt
@@ -0,0 +1,131 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_find_function,tep_find_function_address,tep_find_function_info - Find function name / start address.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+const char pass:[*]*tep_find_function*(struct tep_handle pass:[*]_tep_, unsigned long long _addr_);
+unsigned long long *tep_find_function_address*(struct tep_handle pass:[*]_tep_, unsigned long long _addr_);
+int *tep_find_function_info*(struct tep_handle pass:[*]_tep_, unsigned long long _addr_, const char pass:[**]_name_,
+			   unsigned long long pass:[*]_start_, unsigned long pass:[*]_size_);
+--
+
+DESCRIPTION
+-----------
+These functions can be used to find function name and start address, by given
+address. The given address does not have to be exact, it will select the function
+that would contain it.
+
+The *tep_find_function()* function returns the function name, which contains the
+given address _addr_. The _tep_ argument is the trace event parser context.
+
+The *tep_find_function_address()* function returns the function start address,
+by given address _addr_. The _addr_ does not have to be exact, it will select the
+function that would contain it. The _tep_ argument is the trace event parser context.
+
+The *tep_find_function_info()* function retrieves the _name_, starting address (_start_),
+and the function text _size_ of the function at _address_, if it is found. Note,
+if the _tep_ handle has a function resolver (used by perf), then _size_ is set to
+zero.
+
+RETURN VALUE
+------------
+The *tep_find_function()* function returns the function name, or NULL in case
+it cannot be found.
+
+The *tep_find_function_address()* function returns the function start address,
+or 0 in case it cannot be found.
+
+The *tep_find_function_info()* function returns 1 if a function is found for the
+given address, or 0 if it is not.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+void show_function_name(unsigned long long addr)
+{
+	const char *fname = tep_find_function(tep, addr);
+
+	if (fname)
+		printf("Found function %s at 0x%0llx\n", fname, addr);
+	else
+		printf("No function found at 0x%0llx\n", addr);
+}
+
+void show_function_start_addr(unsigned long long addr)
+{
+	const char *fname = tep_find_function(tep, addr);
+	unsigned long long fstart;
+
+	if (!fname) {
+		printf("No function found at 0x%0llx\n", addr);
+		return;
+	}
+
+	fstart = tep_find_function_address(tep, addr);
+	printf("Function %s at 0x%llx starts at 0x%0llx\n",
+	       fname, addr, fstart);
+}
+
+void show_function_info(unsigned long long addr)
+{
+	const char *fname;
+	unsigned long long fstart;
+	unsigned long size;
+
+	ret = tep_find_function_info(tep, addr, &fname, &fstart, &size);
+	if (!ret) {
+		printf("No function found at 0x%0lx\n", addr);
+		return;
+	}
+
+	printf("Function %s at 0x%lx starts at 0x%0lx and is %ld in size\n",
+	       fname, addr, fstart, size);
+}
+...
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-handle.txt b/Documentation/libtraceevent-handle.txt
new file mode 100644
index 0000000..64528eb
--- /dev/null
+++ b/Documentation/libtraceevent-handle.txt
@@ -0,0 +1,108 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_alloc, tep_free,tep_ref, tep_unref,tep_get_ref, tep_kbuffer - Create, destroy, manage
+references of trace event parser context.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+struct tep_handle pass:[*]*tep_alloc*(void);
+void *tep_free*(struct tep_handle pass:[*]_tep_);
+void *tep_ref*(struct tep_handle pass:[*]_tep_);
+void *tep_unref*(struct tep_handle pass:[*]_tep_);
+int *tep_get_ref*(struct tep_handle pass:[*]_tep_);
+--
+
+DESCRIPTION
+-----------
+These are the main functions to create and destroy tep_handle - the main
+structure, representing the trace event parser context. This context is used as
+the input parameter of most library APIs.
+
+The *tep_alloc()* function allocates and initializes the tep context.
+
+The *tep_free()* function will decrement the reference of the _tep_ handler.
+When there is no more references, then it will free the handler, as well
+as clean up all its resources that it had used. The argument _tep_ is
+the pointer to the trace event parser context.
+
+The *tep_ref()* function adds a reference to the _tep_ handler.
+
+The *tep_unref()* function removes a reference from the _tep_ handler. When
+the last reference is removed, the _tep_ is destroyed, and all resources that
+it had used are cleaned up.
+
+The *tep_ref_get()* functions gets the current references of the _tep_ handler.
+
+The *tep_kbuffer()* function allocates a kbuffer descriptor that can be used to
+parse raw data that is represented by the _tep_ handle descriptor. It must be freed
+with *kbuf_free(3)*.
+
+RETURN VALUE
+------------
+*tep_alloc()* returns a pointer to a newly created tep_handle structure.
+NULL is returned in case there is not enough free memory to allocate it.
+
+*tep_ref_get()* returns the current references of _tep_.
+If _tep_ is NULL, 0 is returned.
+
+*tep_kbuffer()* returns a kbuffer descriptor that can parse the raw data that
+represents the tep handle. Must be freed with *kbuf_free(3)*.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+
+...
+struct tep_handle *tep = tep_alloc();
+...
+int ref = tep_get_ref(tep);
+tep_ref(tep);
+if ( (ref+1) != tep_get_ref(tep)) {
+	/* Something wrong happened, the counter is not incremented by 1 */
+}
+tep_unref(tep);
+...
+tep_free(tep);
+...
+--
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-header_page.txt b/Documentation/libtraceevent-header_page.txt
new file mode 100644
index 0000000..31b66e0
--- /dev/null
+++ b/Documentation/libtraceevent-header_page.txt
@@ -0,0 +1,102 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_get_header_page_size, tep_get_header_timestamp_size, tep_is_old_format -
+Get the data stored in the header page, in kernel context.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+int *tep_get_header_page_size*(struct tep_handle pass:[*]_tep_);
+int *tep_get_header_timestamp_size*(struct tep_handle pass:[*]_tep_);
+bool *tep_is_old_format*(struct tep_handle pass:[*]_tep_);
+--
+DESCRIPTION
+-----------
+These functions retrieve information from kernel context, stored in tracefs
+events/header_page. Old kernels do not have header page info, so default values
+from user space context are used.
+
+The *tep_get_header_page_size()* function returns the size of a long integer,
+in kernel context. The _tep_ argument is trace event parser context.
+This information is retrieved from tracefs events/header_page, "commit" field.
+
+The *tep_get_header_timestamp_size()* function returns the size of timestamps,
+in kernel context. The _tep_ argument is trace event parser context. This
+information is retrieved from tracefs events/header_page, "timestamp" field.
+
+The *tep_is_old_format()* function returns true if the kernel predates
+the addition of events/header_page, otherwise it returns false.
+
+RETURN VALUE
+------------
+The *tep_get_header_page_size()* function returns the size of a long integer,
+in bytes.
+
+The *tep_get_header_timestamp_size()* function returns the size of timestamps,
+in bytes.
+
+The *tep_is_old_format()* function returns true, if an old kernel is used to
+generate the tracing data, which has no event/header_page. If the kernel is new,
+or _tep_ is NULL, false is returned.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+	int longsize;
+	int timesize;
+	bool old;
+
+	longsize = tep_get_header_page_size(tep);
+	timesize = tep_get_header_timestamp_size(tep);
+	old = tep_is_old_format(tep);
+
+	printf ("%s kernel is used to generate the tracing data.\n",
+		old?"Old":"New");
+	printf("The size of a long integer is %d bytes.\n", longsize);
+	printf("The timestamps size is %d bytes.\n", timesize);
+...
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-host_endian.txt b/Documentation/libtraceevent-host_endian.txt
new file mode 100644
index 0000000..76d309a
--- /dev/null
+++ b/Documentation/libtraceevent-host_endian.txt
@@ -0,0 +1,104 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_is_bigendian, tep_is_local_bigendian, tep_set_local_bigendian - Get / set
+the endianness of the local machine.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+enum *tep_endian* {
+	TEP_LITTLE_ENDIAN = 0,
+	TEP_BIG_ENDIAN
+};
+
+int *tep_is_bigendian*(void);
+bool *tep_is_local_bigendian*(struct tep_handle pass:[*]_tep_);
+void *tep_set_local_bigendian*(struct tep_handle pass:[*]_tep_, enum tep_endian _endian_);
+--
+
+DESCRIPTION
+-----------
+
+The *tep_is_bigendian()* gets the endianness of the machine, executing
+the function.
+
+The *tep_is_local_bigendian()* function gets the endianness of the local
+machine, saved in the _tep_ handler. The _tep_ argument is the trace event
+parser context. This API is a bit faster than *tep_is_bigendian()*, as it
+returns cached endianness of the local machine instead of checking it each time.
+
+The *tep_set_local_bigendian()* function sets the endianness of the local
+machine in the _tep_ handler. The _tep_ argument is trace event parser context.
+The _endian_ argument is the endianness:
+[verse]
+--
+	_TEP_LITTLE_ENDIAN_ - the machine is little endian,
+	_TEP_BIG_ENDIAN_ - the machine is big endian.
+--
+
+RETURN VALUE
+------------
+The *tep_is_bigendian()* function returns non zero if the endianness of the
+machine, executing the code, is big endian and zero otherwise.
+
+The *tep_is_local_bigendian()* function returns true, if the endianness of the
+local machine, saved in the _tep_ handler, is big endian, or false otherwise.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+	if (tep_is_bigendian())
+		tep_set_local_bigendian(tep, TEP_BIG_ENDIAN);
+	else
+		tep_set_local_bigendian(tep, TEP_LITTLE_ENDIAN);
+...
+	if (tep_is_local_bigendian(tep))
+		printf("This machine you are running on is bigendian\n");
+	else
+		printf("This machine you are running on is little endian\n");
+
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-kbuffer-create.txt b/Documentation/libtraceevent-kbuffer-create.txt
new file mode 100644
index 0000000..12e5d6c
--- /dev/null
+++ b/Documentation/libtraceevent-kbuffer-create.txt
@@ -0,0 +1,207 @@
+libtraceevent(3)
+================
+
+NAME
+----
+kbuffer_alloc, kbuffer_free, kbuffer_load_subbuffer, kbuffer_subbuffer_size, kbuffer_start_of_data - Creating of kbuffer element to parse
+the Linux kernel tracing ring buffer
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <kbuffer.h>*
+
+enum kbuffer_endian {
+	KBUFFER_ENDIAN_BIG,
+	KBUFFER_ENDIAN_LITTLE,
+	KBUFFER_ENDIAN_SAME_AS_HOST,
+};
+
+enum kbuffer_long_size {
+	KBUFFER_LSIZE_4,
+	KBUFFER_LSIZE_8,
+	KBUFFER_LSIZE_SAME_AS_HOST,
+};
+
+struct kbuffer;
+struct tep_handle;
+
+struct kbuffer pass:[*]*kbuffer_alloc*(enum kbuffer_long_size _size_, enum kbuffer_endian _endian_);
+void *kbuffer_free*(struct kbuffer pass:[*]_kbuf_);
+int *kbuffer_load_subbuffer*(struct kbuffer pass:[*]_kbuf_, void pass:[*]_subbuffer_);
+int *kbuffer_subbuffer_size*(struct kbuffer pass:[*]_kbuf);
+int *kbuffer_start_of_data*(struct kbuffer pass:[*]_kbuf_);
+--
+
+DESCRIPTION
+-----------
+These functions create a _kbuffer_ handle that can be used to parse the raw sub buffers
+of the Linux kernel tracing ring buffer. The ring buffer is found in the tracefs
+directory, and can be retrieved by *tracefs_instance_get_file(3)* at
+*per_cpu/cpuX/trace_pipe_raw* where *X* is replaced by the per CPU number of
+the specified ring buffer. The ring buffer inside the kernel is split up per
+CPU, such that the raw ring buffer must be retrieved per CPU as well.
+
+The *kbuffer_alloc()* will create a descriptor that can be used to manage a sub buffer
+read by the ring buffer. The _size_ parameter denotes what the word size is
+for the given buffer (note, this works from reading raw data from machines other
+than the machine that is calling this function). The _endian_ denotes the endian
+for the machine.
+
+If _endian_ is set to _KBUFFER_ENDIAN_SAME_AS_HOST_ the endian will be set to the same
+as the host endianess, which is useful when the application is reading the
+ring buffer data directly from the same machine it is running on.
+
+If _size_ is set to _KBUFFER_LSIZE_SAME_AS_HOST_, if the word size is 8, it will
+set the kbuffer descriptor to long size of 8. But if the size is 4, then it
+will then perform a *uname(2)* call, and if the _machine_ field has the string "64"
+in it, it will be set to 8 byte long size and not 4 byte. This is because the
+ring buffer long size is dependent on the kernel and not user space.
+
+The *kbuffer_free()* function will free the resources created by *kbuffer_alloc()*.
+
+The *kbuffer_load_subbuffer()* will take a _subbuffer_ which is a raw data blob
+from the tracefs *trace_pipe_raw* file. The Linux tracing ring buffer is broken up
+into sub buffers. Each sub buffer is as stand alone data segment that has all the
+information to split out the individual events and time stamps. This sub buffer
+is what kbuffer uses to walk the events.
+
+The *kbuffer_subbuffer_size()* returns the location of the end of the last event
+on the sub-buffer. It does not return the size of the sub-buffer itself.
+
+The *kbuffer_start_of_data()* function returns the offset of where the actual
+data load of the sub-buffer begins.
+
+RETURN VALUE
+------------
+*kbuffer_alloc()* returns an allocated kbuffer descriptor or NULL on error.
+The returned descriptor must be freed with *kbuffer_free()*
+
+*kbuffer_load_subbuffer()* returns 0 on success and -1 on error.
+
+*kbuffer_subbuffer_size()* returns the index on the subbuffer where the end
+of the last event is located.
+
+*kbuffer_start_of_data()* returns the offset of where the data begins on the
+sub-buffer loaded in _kbuf_.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+#include <kbuffer.h>
+
+int main (int argc, char **argv)
+{
+	unsigned long long ts;
+	struct kbuffer *kbuf;
+	struct stat st;
+	char *buf;
+	void *event;
+	int ret;
+	int fd;
+	int i = 0;
+
+	if (argc < 2) {
+		printf("usage: %s raw-subbuffer-page\n", argv[0]);
+		printf(" Try: dd count=1 bs=4096 if=/sys/kernel/tracing/per_cpu/cpu0/trace_pipe_raw of=/tmp/file\n");
+		exit(0);
+	}
+
+	if (stat(argv[1], &st) < 0) {
+		perror("stat");
+		exit(-1);
+	}
+
+	buf = malloc(st.st_size);
+	if (!buf) {
+		perror("Allocating buffer");
+		exit(-1);
+	}
+
+	fd = open(argv[1], O_RDONLY);
+	if (fd < 0) {
+		perror(argv[1]);
+		exit(-1);
+	}
+
+	ret = read(fd, buf, st.st_size);
+	if (ret < 0) {
+		perror("Reading buffer");
+		exit(-1);
+	}
+	close(fd);
+
+	kbuf = kbuffer_alloc(KBUFFER_ENDIAN_SAME_AS_HOST,
+			     KBUFFER_LSIZE_SAME_AS_HOST);
+	if (!kbuf) {
+		perror("Creating kbuffer");
+		exit(-1);
+	}
+	ret = kbuffer_load_subbuffer(kbuf, buf);
+	if (ret < 0) {
+		perror("Loading sub bufer");
+		exit(-1);
+	}
+
+	if (kbuffer_subbuffer_size(kbuf) > st.st_size) {
+		fprintf(stderr, "kbuffer is bigger than raw size %d > %ld\n",
+			kbuffer_subbuffer_size(kbuf), st.st_size);
+		exit(-1);
+	}
+
+	printf("Kbuffer data starts at %d\n", kbuffer_start_of_data(kbuf));
+	do {
+		event = kbuffer_read_event(kbuf, &ts);
+		if (event) {
+			printf(" event %3d ts:%lld\n", i++, ts);
+			event = kbuffer_next_event(kbuf, NULL);
+		}
+	} while (event);
+
+	if (!event)
+		printf("Finished sub buffer\n");
+
+	kbuffer_free(kbuf);
+
+	return 0;
+}
+--
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-kbuffer-read.txt b/Documentation/libtraceevent-kbuffer-read.txt
new file mode 100644
index 0000000..68184ad
--- /dev/null
+++ b/Documentation/libtraceevent-kbuffer-read.txt
@@ -0,0 +1,246 @@
+libtraceevent(3)
+================
+
+NAME
+----
+kbuffer_read_event, kbuffer_next_event, kbuffer_missed_events, kbuffer_event_size, kbuffer_curr_size,
+kbuffer_curr_offset, kbuffer_curr_index -
+Functions to read through the kbuffer sub buffer.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <kbuffer.h>*
+
+void pass:[*]*kbuffer_read_event*(struct kbuffer pass:[*]_kbuf_, unsigned long long pass:[*]_ts_);
+void pass:[*]*kbuffer_next_event*(struct kbuffer pass:[*]_kbuf_, unsigned long long pass:[*]_ts_);
+void pass:[*]*kbuffer_read_at_offset*(struct kbuffer pass:[*]_kbuf_, int _offset_, unsigned long long pass:[*]_ts_);
+int *kbuffer_missed_events*(struct kbuffer pass:[*]_kbuf_);
+int *kbuffer_event_size*(struct kbuffer pass:[*]_kbuf_);
+int *kbuffer_curr_size*(struct kbuffer pass:[*]_kbuf_);
+int *kbuffer_curr_offset*(struct kbuffer pass:[*]_kbuf_);
+int *kbuffer_curr_index*(struct kbuffer pass:[*]_kbuf_);
+--
+
+DESCRIPTION
+-----------
+The function *kbuffer_read_event()* reads the next event in the _kbuf_ descriptor
+and if _ts_ is non NULL, will place its timestamp into it. This does not modify the _kbuf_
+descriptor, and calling this function mulitple times will return the same result.
+
+The function *kbuffer_next_event()* will return the next event in the _kbuf_ descriptor.
+It will also set the _ts_ to the timestamp of the returned event. NULL is returned
+if there are no more events and _ts_ will be undefined. Note, if this is called directly
+after a *kbuffer_load_subbuffer()* then it will likely give an unexpected result, as it
+will return the second event and not the first event. Usually this function is only used
+to move to the next event and to know if there's any more events to read, and
+*kbuffer_read_event()* is always called first.
+
+The function *kbuffer_read_at_offset()* returns the event located at a given _offset_ from
+the beginning of the sub-buffer. This offset can be retrieved by *kbuffer_curr_offset()*.
+If _ts_ points to an unsigned long long, then it will be set to the event at the given
+offset's timestamp.
+
+If the sub-buffer had missed events before it, then *kbuffer_missed_events()* will return
+the non zero. If it returns -1, that means there were missed events, but the exact number
+of missed events is unknown. If it returns a positive number, then the number of missed events
+is the return value.
+
+The *kbuffer_event_size()* function returns the size of the data portion of the current event
+(the one that would be returned by *kbuffer_read_event()*.
+
+The *kbuffer_curr_size()* function returns the entire record size of the current event
+(the one that would be returned by *kbuffer_read_event()*. The difference here is that the
+return value includes the size of the event record meta data that is not part of what
+is returned by *kbuffer_read_event()*.
+
+The *kbuffer_curr_offset()* function returns the offset from the beginning of the sub-buffer
+of where the current event's meta data for the record begins. The first event will
+not be at offset zero. This offset can be used to retrieve the event with
+*kbuffer_read_at_offset()*.
+
+The *kbuffer_curr_index()* function returns the index from the beginning of the data
+portion of the sub-buffer where the current evnet's meta data is located.
+The first event will likely be zero, but may not be if there's a timestamp attached to it.
+
+RETURN VALUE
+------------
+*kbuffer_read_event()* returns the event that the _kbuf_ descriptor is currently at,
+or NULL if the last event was passed (by *kbuffer_next_event()*).
+
+*kbuffer_next_event()* returns the next event after the current event or NULL if there
+are no more events.
+
+*kbuffer_read_at_offset()* returns the event at a given _offset_ from the start of
+the sub-buffer stored in _kbuf_, or NULL if there exists no event. Note, _offset_
+only needs to be an offset that lands on the record, or is at the start of it. It does
+not need to be exactly at the beginning of the record.
+
+*kbuffer_missed_events()* returns 0 if there were no missed events before loaded sub-buffer.
+Returns -1 if there were an unknown number of missed events, or if the number of missed events
+is known, that number will be returned.
+
+*kbuffer_event_size()* returns the size of the data payload of the current event of _kbuf_.
+
+*kbuffer_curr_size()* returns the size of the entire record of the current event of _kbuf_.
+This includes the size of the meta data for that record.
+
+*kbuf_curr_offset()* returns the offset of the current record from the beginning of the _kbuf_
+sub-buffer.
+
+*kbuf_curr_index()* returns the index of the current record from the beginning of the _kbuf_
+data section.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+#include <kbuffer.h>
+
+int main (int argc, char **argv)
+{
+	unsigned long long ts;
+	struct kbuffer *kbuf;
+	struct stat st;
+	char *buf;
+	void *event;
+	int save_offset = -1;
+	int record_size;
+	int offset;
+	int index;
+	int size;
+	int ret;
+	int fd;
+	int i = 0;
+
+	if (argc < 2) {
+		printf("usage: %s raw-subbuffer-page\n", argv[0]);
+		printf(" Try: dd count=1 bs=4096 if=/sys/kernel/tracing/per_cpu/cpu0/trace_pipe_raw of=/tmp/file\n");
+		exit(0);
+	}
+
+	if (stat(argv[1], &st) < 0) {
+		perror("stat");
+		exit(-1);
+	}
+
+	buf = malloc(st.st_size);
+	if (!buf) {
+		perror("Allocating buffer");
+		exit(-1);
+	}
+
+	fd = open(argv[1], O_RDONLY);
+	if (fd < 0) {
+		perror(argv[1]);
+		exit(-1);
+	}
+
+	ret = read(fd, buf, st.st_size);
+	if (ret < 0) {
+		perror("Reading buffer");
+		exit(-1);
+	}
+	close(fd);
+
+	kbuf = kbuffer_alloc(KBUFFER_ENDIAN_SAME_AS_HOST,
+			     KBUFFER_LSIZE_SAME_AS_HOST);
+	if (!kbuf) {
+		perror("Creating kbuffer");
+		exit(-1);
+	}
+	ret = kbuffer_load_subbuffer(kbuf, buf);
+	if (ret < 0) {
+		perror("Loading sub bufer");
+		exit(-1);
+	}
+
+	if (kbuffer_subbuffer_size(kbuf) > st.st_size) {
+		fprintf(stderr, "kbuffer is bigger than raw size %d > %ld\n",
+			kbuffer_subbuffer_size(kbuf), st.st_size);
+		exit(-1);
+	}
+
+	ret = kbuffer_missed_events(kbuf);
+	if (ret) {
+		if (ret > 0)
+			printf("Missed %d events before this buffer\n", ret);
+		else
+			printf("Missed unknown number of events before this buffer\n");
+	}
+	do {
+		event = kbuffer_read_event(kbuf, &ts);
+		if (event) {
+			record_size = kbuffer_curr_size(kbuf);
+			offset = kbuffer_curr_offset(kbuf);
+			index = kbuffer_curr_index(kbuf);
+			size = kbuffer_event_size(kbuf);
+
+			if (i == 20)
+				save_offset = offset;
+			printf(" event %3d ts:%lld\trecord_size:%d size:%d\tindex:%d offset:%d\n",
+			       i++, ts, record_size, size, index, offset);
+			event = kbuffer_next_event(kbuf, NULL);
+		}
+	} while (event);
+
+	if (!event)
+		printf("Finished sub buffer\n");
+
+	if (save_offset > 0) {
+		event = kbuffer_read_at_offset(kbuf, save_offset, &ts);
+		if (!event) {
+			fprintf(stderr, "Funny, can't find event 20 at offset %d\n", save_offset);
+			exit(-1);
+		}
+		record_size = kbuffer_curr_size(kbuf);
+		offset = kbuffer_curr_offset(kbuf);
+		index = kbuffer_curr_index(kbuf);
+		size = kbuffer_event_size(kbuf);
+
+		printf("\n saved event 20 ts:%lld\trecord_size:%d size:%d\tindex:%d offset:%d\n\n",
+		       ts, record_size, size, index, offset);
+	}
+	kbuffer_free(kbuf);
+
+	return 0;
+}
+--
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-kbuffer-timestamp.txt b/Documentation/libtraceevent-kbuffer-timestamp.txt
new file mode 100644
index 0000000..d7de225
--- /dev/null
+++ b/Documentation/libtraceevent-kbuffer-timestamp.txt
@@ -0,0 +1,208 @@
+libtraceevent(3)
+================
+
+NAME
+----
+kbuffer_timestamp, kbuffer_subbuf_timestamp -
+Functions that read various data of a kbuffer descriptor
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <kbuffer.h>*
+
+unsigned long long *kbuffer_timestamp*(struct kbuffer pass:[*]_kbuf_);
+unsigned long long *kbuffer_subbuf_timestamp*(struct kbuffer pass:[*]_kbuf_, void pass:[*]_subbuf_);
+--
+
+DESCRIPTION
+-----------
+The function *kbuffer_timestamp()* returns the timestamp of the current event of _kbuf_.
+
+The function *kbuffer_subbuf_timestamp()* returns the timestamp for the sub-buffer
+that was loaded in _kbuf_. This usually is (but not guaranteed to be) the timestamp
+of the first event on the sub-buffer.
+
+The function *kbuffer_start_of_data()* returns the offset of where the delta
+
+RETURN VALUE
+------------
+*kbuffer_read_event()* returns the event that the _kbuf_ descriptor is currently at,
+or NULL if the last event was passed (by *kbuffer_next_event()*).
+
+*kbuffer_next_event()* returns the next event after the current event or NULL if there
+are no more events.
+
+*kbuffer_read_at_offset()* returns the event at a given _offset_ from the start of
+the sub-buffer stored in _kbuf_, or NULL if there exists no event. Note, _offset_
+only needs to be an offset that lands on the record, or is at the start of it. It does
+not need to be exactly at the beginning of the record.
+
+*kbuffer_missed_events()* returns 0 if there were no missed events before loaded sub-buffer.
+Returns -1 if there were an unknown number of missed events, or if the number of missed events
+is known, that number will be returned.
+
+*kbuffer_event_size()* returns the size of the data payload of the current event of _kbuf_.
+
+*kbuffer_curr_size()* returns the size of the entire record of the current event of _kbuf_.
+This includes the size of the meta data for that record.
+
+*kbuf_curr_offset()* returns the offset of the current record from the beginning of the _kbuf_
+sub-buffer.
+
+*kbuf_curr_index()* returns the index of the current record from the beginning of the _kbuf_
+data section.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+#include <kbuffer.h>
+
+int main (int argc, char **argv)
+{
+	unsigned long long ts;
+	struct kbuffer *kbuf;
+	struct stat st;
+	char *buf;
+	void *event;
+	int save_offset = -1;
+	int record_size;
+	int offset;
+	int index;
+	int size;
+	int ret;
+	int fd;
+	int i = 0;
+
+	if (argc < 2) {
+		printf("usage: %s raw-subbuffer-page\n", argv[0]);
+		printf(" Try: dd count=1 bs=4096 if=/sys/kernel/tracing/per_cpu/cpu0/trace_pipe_raw of=/tmp/file\n");
+		exit(0);
+	}
+
+	if (stat(argv[1], &st) < 0) {
+		perror("stat");
+		exit(-1);
+	}
+
+	buf = malloc(st.st_size);
+	if (!buf) {
+		perror("Allocating buffer");
+		exit(-1);
+	}
+
+	fd = open(argv[1], O_RDONLY);
+	if (fd < 0) {
+		perror(argv[1]);
+		exit(-1);
+	}
+
+	ret = read(fd, buf, st.st_size);
+	if (ret < 0) {
+		perror("Reading buffer");
+		exit(-1);
+	}
+	close(fd);
+
+	kbuf = kbuffer_alloc(KBUFFER_ENDIAN_SAME_AS_HOST,
+			     KBUFFER_LSIZE_SAME_AS_HOST);
+	if (!kbuf) {
+		perror("Creating kbuffer");
+		exit(-1);
+	}
+	ret = kbuffer_load_subbuffer(kbuf, buf);
+	if (ret < 0) {
+		perror("Loading sub bufer");
+		exit(-1);
+	}
+
+	if (kbuffer_subbuffer_size(kbuf) > st.st_size) {
+		fprintf(stderr, "kbuffer is bigger than raw size %d > %ld\n",
+			kbuffer_subbuffer_size(kbuf), st.st_size);
+		exit(-1);
+	}
+
+	ret = kbuffer_missed_events(kbuf);
+	if (ret) {
+		if (ret > 0)
+			printf("Missed %d events before this buffer\n", ret);
+		else
+			printf("Missed unknown number of events before this buffer\n");
+	}
+	do {
+		event = kbuffer_read_event(kbuf, &ts);
+		if (event) {
+			record_size = kbuffer_curr_size(kbuf);
+			offset = kbuffer_curr_offset(kbuf);
+			index = kbuffer_curr_index(kbuf);
+			size = kbuffer_event_size(kbuf);
+
+			if (i == 20)
+				save_offset = offset;
+			printf(" event %3d ts:%lld\trecord_size:%d size:%d\tindex:%d offset:%d\n",
+			       i++, ts, record_size, size, index, offset);
+			event = kbuffer_next_event(kbuf, NULL);
+		}
+	} while (event);
+
+	if (!event)
+		printf("Finished sub buffer\n");
+
+	if (save_offset > 0) {
+		event = kbuffer_read_at_offset(kbuf, save_offset, &ts);
+		if (!event) {
+			fprintf(stderr, "Funny, can't find event 20 at offset %d\n", save_offset);
+			exit(-1);
+		}
+		record_size = kbuffer_curr_size(kbuf);
+		offset = kbuffer_curr_offset(kbuf);
+		index = kbuffer_curr_index(kbuf);
+		size = kbuffer_event_size(kbuf);
+
+		printf("\n saved event 20 ts:%lld\trecord_size:%d size:%d\tindex:%d offset:%d\n\n",
+		       ts, record_size, size, index, offset);
+	}
+	kbuffer_free(kbuf);
+
+	return 0;
+}
+--
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-kvm-plugin.txt b/Documentation/libtraceevent-kvm-plugin.txt
new file mode 100644
index 0000000..a02e786
--- /dev/null
+++ b/Documentation/libtraceevent-kvm-plugin.txt
@@ -0,0 +1,252 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_plugin_kvm_get_func, tep_plugin_kvm_put_func - Add function name for instruction pointer of kvm plugin
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+const char pass:[*]*tep_plugin_kvm_get_func*(struct tep_event pass:[*]event,
+				    struct tep_record pass:[*]record,
+				    unsigned long long pass:[*]paddr);
+void *tep_plugin_kvm_put_func*(const char pass:[*]func);
+--
+
+DESCRIPTION
+-----------
+The functions *tep_plugin_kvm_get_func()* and *tep_plugin_kvm_put_func()*
+are not to be called by an application, but instead are to be defined by
+an application.
+
+Certain events (like kvm_exit and kvm_entry) have the instruction pointer
+of where in the guest the context changed from guest to host. As the host
+only knows the instruction pointer and does not have information about what
+function in the guest that instruction pointer belongs to, it can only print
+the address.
+
+But the application may have more information about the guest, and know where
+the guest was when the exit occurred, and also even know the function name
+of that address.
+
+The KVM plugin for libtraceevent is called on these events, and then calls
+*tep_plugin_kvm_get_func()* to see if that function can resolve the instruction
+pointer address to a real function name. If the return is non NULL, it will
+print the function in the output for that event.
+
+These functions are currently defined as weak functions within the plugin, as
+to not require them to be defined elsewhere. For an application to override
+the weak function, it will need to define the function in a file that gets
+compiled with *-rdynamic*. That will tell the dynamic linker to examine that
+object file and use function names to resolve weak functions in other shared
+objects (in this case the KVM plugin shared object).
+
+If the application defines *tep_plugin_kvm_get_func()*, it must use the above
+prototype. The _event_ will hold the KVM event that has the instruction pointer
+field. The _record_ will be the instance of that event. The application's function
+does not need to use these parameters, but they may be useful for finding the
+function name for the address. The _paddr_ is a pointer to a 64 bit value (where
+only 32 bits may be used on 32 bit machines). This value is the instruction
+pointer to look up. If the application knows the start address of the function
+as well, it can set _paddr_ to that address, and the KVM plugin will also
+append a "+offset" to the function name where the offset is the original
+value in _paddr_ minus the value in _paddr_ when it is called. Finally,
+the application should return the function name as a nul terminated string
+if one is found.
+
+If the returned string of *tep_plugin_kvm_get_func()* was allocated, the KVM plugin
+will call *tep_plugin_kvm_put_func()* when it is through with it, passing the
+value returned by *tep_plugin_kvm_get_func()* as _func_. This allows the application
+to free it if necessary.
+
+RETURN VALUE
+------------
+The *tep_plugin_kvm_get_func()* is not to be called by the application but instead
+is to be defined by the application. It should return a nul terminated string representing
+the function for the given instruction pointer passed to it by reference in _paddr_. It
+can then optionally update the _paddr_ to a value that holds the start of the function.
+The string returned may be freed by the *tep_plugin_kvm_put_func()* that the application
+should define to clean up the string.
+
+The below example needs to be compiled with the *-rdynamic* flag so that the dynamic
+linker can resolve the *tep_plugin_kvm_get_func()* and *tep_plugin_kvm_put_func()* functions.
+
+When run against a trace.dat file produced by *trace-cmd(1)* recording the kvm_exit and
+kvm_entry events on a guest, and then the guest's /proc/kallsyms file is passed as the
+second parameter, the output produced will look something like:
+
+[source,c]
+--
+CPU 0/KVM-20407 83156.177626 [000] kvm_exit     reason APIC_ACCESS rip 0xffffffffb0056ee2 exit native_apic_mem_write+0x2 info 10b0 0
+CPU 0/KVM-20407 83156.177632 [000] kvm_entry     vcpu 0 rip 0xffffffffb0056ee8 enter native_apic_mem_write+0x8
+--
+
+But without those callbacks, it would look like:
+
+[source,c]
+--
+CPU 0/KVM-20407 83156.177626 [000] kvm_exit     reason APIC_ACCESS rip 0xffffffffb0056ee2 info 10b0 0
+CPU 0/KVM-20407 83156.177632 [000] kvm_entry     vcpu 0 rip 0xffffffffb0056ee8
+--
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <stdio.h>
+#include <stdlib.h>
+#include <event-parse.h>
+#include <trace-cmd.h>
+#include <sys/stat.h>
+
+static struct tep_handle *tep;
+
+const char *tep_plugin_kvm_get_func(struct tep_event *event, struct tep_record *record,
+				    unsigned long long *paddr)
+{
+	const char *func;
+	char *event_func;
+	char *ename;
+
+	func = tep_find_function(tep, *paddr);
+	if (!func)
+		return NULL;
+
+	if (strcmp(event->name, "kvm_exit") == 0)
+		ename = "exit";
+	else
+		ename = "enter";
+
+	/*
+	 * Normally, passing back func directly is sufficient and then
+	 * tep_plugin_kvm_put_func() would not be required. But this example
+	 * is showing how to handle allocation of the returned string.
+	 */
+	event_func = malloc(strlen(ename) + strlen(func) + 2);
+	if (!event_func)
+		return NULL;
+	sprintf(event_func, "%s %s", ename, func);
+
+	*paddr = tep_find_function_address(tep, *paddr);
+
+	return event_func;
+}
+
+void tep_plugin_kvm_put_func(const char *func)
+{
+	char *f = (char *)func;
+
+	free(f);
+}
+
+static int show_event(struct tracecmd_input *handle, struct tep_event *event,
+		      struct tep_record *record, int cpu, void *data)
+{
+	static struct trace_seq seq;
+	tep = data;
+
+	if (!seq.buffer)
+		trace_seq_init(&seq);
+
+	trace_seq_reset(&seq);
+	tep_print_event(tracecmd_get_tep(handle), &seq, record,
+			"%s-%d\t%6.1000d [%03d] %s\t%s\n",
+			TEP_PRINT_COMM, TEP_PRINT_PID,
+			TEP_PRINT_TIME, TEP_PRINT_CPU,
+			TEP_PRINT_NAME, TEP_PRINT_INFO);
+	trace_seq_terminate(&seq);
+	trace_seq_do_printf(&seq);
+	return 0;
+}
+
+int main(int argc, char **argv)
+{
+	struct tracecmd_input *handle;
+	struct tep_handle *guest_tep;
+	struct stat st;
+	FILE *fp;
+	char *buf;
+
+	if (argc < 3) {
+		printf("usage: trace.dat guest_kallsyms_file\n");
+		exit(-1);
+	}
+
+	handle = tracecmd_open(argv[1], 0);
+	if (!handle) {
+		perror(argv[1]);
+		exit(-1);
+	}
+
+	/* Just for kallsyms parsing */
+	guest_tep = tep_alloc();
+	if (!guest_tep)
+		exit(-1);
+
+	if (stat(argv[2], &st) < 0) {
+		perror(argv[2]);
+		exit(-1);
+	}
+
+	buf = malloc(st.st_size + 1);
+	if (!buf)
+		exit(-1);
+
+	fp = fopen(argv[2], "r");
+	if (!fp) {
+		perror(argv[2]);
+		exit(-1);
+	}
+
+	if (fread(buf, st.st_size, 1, fp) < 0) {
+		perror(argv[2]);
+		exit(-1);
+	}
+
+	buf[st.st_size] = '\0';
+
+	if (tep_parse_kallsyms(guest_tep, buf) < 0) {
+		printf("Failed to parse %s\n", argv[2]);
+		exit(-1);
+	}
+	free(buf);
+
+	tracecmd_follow_event(handle, "kvm", "kvm_exit", show_event, guest_tep);
+	tracecmd_follow_event(handle, "kvm", "kvm_entry", show_event, guest_tep);
+
+	tracecmd_iterate_events(handle, NULL, 0, NULL, NULL);
+
+	tep_free(guest_tep);
+	tracecmd_close(handle);
+}
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-log.txt b/Documentation/libtraceevent-log.txt
new file mode 100644
index 0000000..a236e2a
--- /dev/null
+++ b/Documentation/libtraceevent-log.txt
@@ -0,0 +1,90 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_set_loglevel - Set log level of the library
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+enum *tep_loglevel* {
+	TEP_LOG_NONE = 0,
+	TEP_LOG_CRITICAL,
+	TEP_LOG_ERROR,
+	TEP_LOG_WARNING,
+	TEP_LOG_INFO,
+	TEP_LOG_DEBUG,
+	TEP_LOG_ALL
+};
+
+int *tep_set_loglevel*(enum tep_loglevel _level_);
+
+--
+DESCRIPTION
+-----------
+The *tep_set_loglevel()* function sets the level of the library logs that will be printed
+on the console. Library log levels are:
+[verse]
+--
+	_TEP_LOG_NONE_ - Do not print any logs.
+	_TEP_LOG_CRITICAL_ - Print critical logs, problem that may cause a crash.
+	_TEP_LOG_ERROR_ - Print error logs, problem that could break the main logic of an API.
+	_TEP_LOG_WARNING_ - Print warnings, problem that could limit the result of an API.
+	_TEP_LOG_INFO_ - Print information about normal execution of an API.
+	_TEP_LOG_DEBUG_ - Print debug information.
+	_TEP_LOG_ALL_ - Print logs from all levels.
+--
+Setting the log level to specific value means that logs from the previous levels will be printed
+too. For example _TEP_LOG_WARNING_ will print any logs with severity _TEP_LOG_WARNING_,
+_TEP_LOG_ERROR_ and _TEP_LOG_CRITICAL_. The default log level is _TEP_LOG_CRITICAL_.
+
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+
+tep_set_loglevel(TEP_LOG_ALL);
+...
+/* call libtraceevent APIs and observe any logs they produce */
+...
+tep_set_loglevel(TEP_LOG_CRITICAL);
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-long_size.txt b/Documentation/libtraceevent-long_size.txt
new file mode 100644
index 0000000..c4b358a
--- /dev/null
+++ b/Documentation/libtraceevent-long_size.txt
@@ -0,0 +1,78 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_get_long_size, tep_set_long_size - Get / set the size of a long integer on
+the machine, where the trace is generated, in bytes
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+int *tep_get_long_size*(strucqt tep_handle pass:[*]_tep_);
+void *tep_set_long_size*(struct tep_handle pass:[*]_tep_, int _long_size_);
+--
+
+DESCRIPTION
+-----------
+The *tep_get_long_size()* function returns the size of a long integer on the machine,
+where the trace is generated. The _tep_ argument is trace event parser context.
+
+The *tep_set_long_size()* function sets the size of a long integer on the machine,
+where the trace is generated. The _tep_ argument is trace event parser context.
+The _long_size_ is the size of a long integer, in bytes.
+
+RETURN VALUE
+------------
+The *tep_get_long_size()* function returns the size of a long integer on the machine,
+where the trace is generated, in bytes.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+tep_set_long_size(tep, 4);
+...
+int long_size = tep_get_long_size(tep);
+...
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-page_size.txt b/Documentation/libtraceevent-page_size.txt
new file mode 100644
index 0000000..6d0dd36
--- /dev/null
+++ b/Documentation/libtraceevent-page_size.txt
@@ -0,0 +1,90 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_get_page_size, tep_set_page_size, tep_get_sub_buffer_size - Get / set the size of a memory page on
+the machine, where the trace is generated
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+int *tep_get_page_size*(struct tep_handle pass:[*]_tep_);
+void *tep_set_page_size*(struct tep_handle pass:[*]_tep_, int _page_size_);
+int *tep_get_sub_buffer_size*(struct tep_handle pass:[*]_tep_);
+--
+
+DESCRIPTION
+-----------
+The *tep_get_page_size()* function returns the size of a memory page on
+the machine, where the trace is generated. The _tep_ argument is trace
+event parser context.
+
+The *tep_set_page_size()* function stores in the _tep_ context the size of a
+memory page on the machine, where the trace is generated.
+The _tep_ argument is trace event parser context.
+The _page_size_ argument is the size of a memory page, in bytes.
+
+The *tep_get_sub_buffer_size()* returns the size of each "sub buffer" of the
+ring buffer. The Linux kernel ring buffer is broken up into sections called
+sub buffers. This returns the size of those buffers.
+
+RETURN VALUE
+------------
+The *tep_get_page_size()* function returns size of the memory page, in bytes.
+
+The *tep_get_sub_buffer_size()* function returns the number of bytes each sub
+buffer is made up of.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <unistd.h>
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+	int page_size = getpagesize();
+
+	tep_set_page_size(tep, page_size);
+
+	printf("The page size for this machine is %d\n", tep_get_page_size(tep));
+
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-parse-files.txt b/Documentation/libtraceevent-parse-files.txt
new file mode 100644
index 0000000..bb2facb
--- /dev/null
+++ b/Documentation/libtraceevent-parse-files.txt
@@ -0,0 +1,149 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_parse_saved_cmdlines, tep_parse_printk_formats, tep_parse_kallsyms
+- Parsing functions to load mappings
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+int *tep_parse_saved_cmdlines*(struct tep_handle pass:[*]_tep_, const char pass:[*]_buf_);
+int *tep_parse_printk_formats*(struct tep_handle pass:[*]_tep_, const char pass:[*]_buf_);
+int *tep_parse_kallsyms*(struct tep_handle pass:[*]_tep_, const char pass:[*]_buf_);
+--
+
+DESCRIPTION
+-----------
+*tep_parse_saved_cmdlines()* is a helper function to parse content in the tracefs
+file system of the "saved_cmdlines" file (stored in a string buffer passed in by _buf_)
+and loads the mapping of the process IDs (pid) to the comm names in the
+_tep_ handler. The events store the pid and this is used to be able to show the
+process names associated to those process ids. It parses the string _buf_ that
+holds the content of saved_cmdlines and ends with a nul character ('\0').
+
+*tep_parse_printk_formats()* is a helper function to parse content in the tracefs
+file system of the "printk_formats" file (stored in a string buffer passed in by _buf_)
+and loads the mapping of addresses of strings that may be referenced by events.
+Events only store the address of constant strings in the kernel, and the mapping
+of their address to the string is exported to user space in the printk_formats
+file. It parses the string _buf_ that holds the content of printk_formats and
+ends with a nul character ('\0').
+
+*tep_parse_kallsyms()* is a helper function to parse the Linux kernel /proc/kallsyms format
+(stored in a string buffer passed in by _buf_) and load the functions into the
+_tep_ handler such that function IP addresses can be mapped to their name when
+parsing events with %pS in the print format field. It parses the string _buf_ that
+holds the content of /proc/kallsyms and ends with a nul character ('\0').
+
+RETURN VALUE
+------------
+The *tep_parse_saved_cmdlines*() function returns 0 in case of success, or -1
+in case of an error.
+
+The *tep_parse_printk_formats*() function returns 0 in case of success, or -1
+in case of an error.
+
+The *tep_parse_kallsyms*() function returns 0 in case of success, or -1
+in case of an error.
+
+EXAMPLE
+-------
+[source,c]
+--
+...
+#include <event-parse.h>
+#include <tracefs.h>
+#include <stdlib.h>
+
+int load_cmdlines(struct tep_handle *tep)
+{
+        char *buf = NULL;
+        int r;
+
+        buf = tracefs_instance_file_read(NULL, "saved_cmdlines", NULL);
+        if (!buf)
+                return -1;
+        r = tep_parse_saved_cmdlines(tep, buf);
+        free(buf);
+        return r;
+}
+
+int load_print_strings(struct tep_handle *tep)
+{
+        char *buf = NULL;
+        int r;
+
+        buf = tracefs_instance_file_read(NULL, "printk_formats", NULL);
+        if (!buf)
+                return -1;
+        r = tep_parse_printk_formats(tep, buf);
+        free(buf);
+        return r;
+}
+
+int load_kallsyms(struct tep_handle *tep)
+{
+        char *line = NULL;
+        char *buf = NULL;
+        size_t sz = 0;
+        FILE *fp;
+        int len = 0;
+        int r;
+
+        fp = fopen("/proc/kallsyms", "r");
+        while ((r = getline(&line, &sz, fp)) >= 0) {
+                buf = realloc(buf, len + r + 1);
+                memcpy(buf + len, line, r);
+                len += r;
+        }
+        free(line);
+        fclose(fp);
+        if (!buf)
+                return -1;
+        buf[len] = 0;
+
+        r = tep_parse_kallsyms(tep, buf);
+        free(buf);
+        return r;
+}
+...
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1), *tep_register_comm*(3), *tep_register_function*(3),
+*tep_register_print_string*(3)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, coauthor of *libtraceevent*.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-parse_event.txt b/Documentation/libtraceevent-parse_event.txt
new file mode 100644
index 0000000..466d157
--- /dev/null
+++ b/Documentation/libtraceevent-parse_event.txt
@@ -0,0 +1,90 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_parse_event, tep_parse_format - Parse the event format information
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+enum tep_errno *tep_parse_event*(struct tep_handle pass:[*]_tep_, const char pass:[*]_buf_, unsigned long _size_, const char pass:[*]_sys_);
+enum tep_errno *tep_parse_format*(struct tep_handle pass:[*]_tep_, struct tep_event pass:[*]pass:[*]_eventp_, const char pass:[*]_buf_, unsigned long _size_, const char pass:[*]_sys_);
+--
+
+DESCRIPTION
+-----------
+The *tep_parse_event()* function parses the event format and creates an event
+structure to quickly parse raw data for a given event. The _tep_ argument is
+the trace event parser context. The created event structure is stored in the
+_tep_ context. The _buf_ argument is a buffer with _size_, where the event
+format data is. The event format data can be taken from
+tracefs/events/.../.../format files. The _sys_ argument is the system of
+the event.
+
+The *tep_parse_format()* function does the same as *tep_parse_event()*. The only
+difference is in the extra _eventp_ argument, where the newly created event
+structure is returned.
+
+RETURN VALUE
+------------
+Both *tep_parse_event()* and *tep_parse_format()* functions return 0 on success,
+or TEP_ERRNO__... in case of an error.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+char *buf;
+int size;
+struct tep_event *event = NULL;
+buf = read_file("/sys/kernel/tracing/events/ftrace/print/format", &size);
+if (tep_parse_event(tep, buf, size, "ftrace") != 0) {
+	/* Failed to parse the ftrace print format */
+}
+
+if (tep_parse_format(tep, &event, buf, size, "ftrace") != 0) {
+	/* Failed to parse the ftrace print format */
+}
+...
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-parse_head.txt b/Documentation/libtraceevent-parse_head.txt
new file mode 100644
index 0000000..22b0a4f
--- /dev/null
+++ b/Documentation/libtraceevent-parse_head.txt
@@ -0,0 +1,82 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_parse_header_page - Parses the data stored in the header page.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+int *tep_parse_header_page*(struct tep_handle pass:[*]_tep_, char pass:[*]_buf_, unsigned long _size_, int _long_size_);
+--
+
+DESCRIPTION
+-----------
+The *tep_parse_header_page()* function parses the header page data from _buf_,
+and initializes the _tep_, trace event parser context, with it. The buffer
+_buf_ is with _size_, and is supposed to be copied from
+tracefs/events/header_page.
+
+Some old kernels do not have header page info, in this case the
+*tep_parse_header_page()* function  can be called with _size_ equal to 0. The
+_tep_ context is initialized with default values. The _long_size_ can be used in
+this use case, to set the size of a long integer to be used.
+
+RETURN VALUE
+------------
+The *tep_parse_header_page()* function returns 0 in case of success, or -1
+in case of an error.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+char *buf;
+int size;
+buf = read_file("/sys/kernel/tracing/events/header_page", &size);
+if (tep_parse_header_page(tep, buf, size, sizeof(unsigned long)) != 0) {
+	/* Failed to parse the header page */
+}
+...
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-plugins.txt b/Documentation/libtraceevent-plugins.txt
new file mode 100644
index 0000000..4ca78d4
--- /dev/null
+++ b/Documentation/libtraceevent-plugins.txt
@@ -0,0 +1,150 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_load_plugins, tep_unload_plugins, tep_load_plugins_hook, tep_add_plugin_path,
+tep_plugin_add_option - Load / unload traceevent plugins.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+struct tep_plugin_list pass:[*]*tep_load_plugins*(struct tep_handle pass:[*]_tep_);
+void *tep_unload_plugins*(struct tep_plugin_list pass:[*]_plugin_list_, struct tep_handle pass:[*]_tep_);
+void *tep_load_plugins_hook*(struct tep_handle pass:[*]_tep_, const char pass:[*]_suffix_,
+			   void (pass:[*]_load_plugin_)(struct tep_handle pass:[*]tep,
+					       const char pass:[*]path,
+					       const char pass:[*]name,
+					       void pass:[*]data),
+			   void pass:[*]_data_);
+int *tep_add_plugin_path*(struct tep_handle pass:[*]tep, char pass:[*]path,
+			  enum tep_plugin_load_priority prio);
+int *tep_plugin_add_option*(const char pass:[*]_name_, const char pass:[*]_val_);
+--
+
+DESCRIPTION
+-----------
+The *tep_load_plugins()* function loads all plugins, located in the plugin
+directories. The _tep_ argument is trace event parser context.
+The plugin directories are :
+[verse]
+--
+	- Directories, specified in _tep_->plugins_dir with priority TEP_PLUGIN_FIRST
+	- System's plugin directory, defined at the library compile time. It
+	  depends on the library installation prefix and usually is
+	  _(install_preffix)/lib/traceevent/plugins_
+	- Directory, defined by the environment variable _TRACEEVENT_PLUGIN_DIR_
+	- User's plugin directory, located at _~/.local/lib/traceevent/plugins_
+	- Directories, specified in _tep_->plugins_dir with priority TEP_PLUGIN_LAST
+--
+Loading of plugins can be controlled by the _tep_flags_, using the
+*tep_set_flag()* API:
+[verse]
+--
+	_TEP_DISABLE_SYS_PLUGINS_	- do not load plugins, located in
+					the system's plugin directory.
+	_TEP_DISABLE_PLUGINS_		- do not load any plugins.
+--
+The *tep_set_flag()* API needs to be called before *tep_load_plugins()*, if
+loading of all plugins is not the desired case.
+
+The *tep_unload_plugins()* function unloads the plugins, previously loaded by
+*tep_load_plugins()*. The _tep_ argument is trace event parser context. The
+_plugin_list_ is the list of loaded plugins, returned by
+the *tep_load_plugins()* function.
+
+The *tep_load_plugins_hook()* function walks through all directories with plugins
+and calls user specified *load_plugin()* hook for each plugin file. Only files
+with given _suffix_ are considered to be plugins. The _data_ is a user specified
+context, passed to *load_plugin()*. Directories and the walk order are the same
+as in *tep_load_plugins()* API.
+
+The *tep_add_plugin_path()* functions adds additional directories with plugins in
+the _tep_->plugins_dir list. It must be called before *tep_load_plugins()* in order
+for the plugins from the new directories to be loaded. The _tep_ argument is
+the trace event parser context. The _path_ is the full path to the new plugin
+directory. The _prio_ argument specifies the loading priority order for the
+new directory of plugins. The loading priority is important in case of different
+versions of the same plugin located in multiple plugin directories.The last loaded
+plugin wins. The priority can be:
+[verse]
+--
+	_TEP_PLUGIN_FIRST_	- Load plugins from this directory first
+	_TEP_PLUGIN_LAST_	- Load plugins from this directory last
+--
+Where the plugins in TEP_PLUGIN_LAST" will take precedence over the
+plugins in the other directories.
+
+The *tep_plugin_add_option()* sets options defined by a plugin. The _name_ is the
+name of the option to set to _val_. Plugins can add options to change its behavior
+and *tep_plugin_add_option()* is used by the application to make those modifications.
+
+
+RETURN VALUE
+------------
+The *tep_load_plugins()* function returns a list of successfully loaded plugins,
+or NULL in case no plugins are loaded.
+The *tep_add_plugin_path()* function returns -1 in case of an error, 0 otherwise.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+tep_add_plugin_path(tep, "~/dev_plugins", TEP_PLUGIN_LAST);
+...
+struct tep_plugin_list *plugins = tep_load_plugins(tep);
+if (plugins == NULL) {
+	/* no plugins are loaded */
+}
+...
+tep_unload_plugins(plugins, tep);
+...
+void print_plugin(struct tep_handle *tep, const char *path,
+		  const char *name, void *data)
+{
+	pritnf("Found libtraceevent plugin %s/%s\n", path, name);
+}
+...
+tep_load_plugins_hook(tep, ".so", print_plugin, NULL);
+...
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1), *tep_set_flag*(3)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-record_parse.txt b/Documentation/libtraceevent-record_parse.txt
new file mode 100644
index 0000000..dbc3a76
--- /dev/null
+++ b/Documentation/libtraceevent-record_parse.txt
@@ -0,0 +1,137 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_data_type, tep_data_pid,tep_data_preempt_count, tep_data_flags -
+Extract common fields from a record.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+enum *trace_flag_type* {
+	_TRACE_FLAG_IRQS_OFF_,
+	_TRACE_FLAG_IRQS_NOSUPPORT_,
+	_TRACE_FLAG_NEED_RESCHED_,
+	_TRACE_FLAG_HARDIRQ_,
+	_TRACE_FLAG_SOFTIRQ_,
+};
+
+int *tep_data_type*(struct tep_handle pass:[*]_tep_, struct tep_record pass:[*]_rec_);
+int *tep_data_pid*(struct tep_handle pass:[*]_tep_, struct tep_record pass:[*]_rec_);
+int *tep_data_preempt_count*(struct tep_handle pass:[*]_tep_, struct tep_record pass:[*]_rec_);
+int *tep_data_flags*(struct tep_handle pass:[*]_tep_, struct tep_record pass:[*]_rec_);
+--
+
+DESCRIPTION
+-----------
+This set of functions can be used to extract common fields from a record.
+
+The *tep_data_type()* function gets the event id from the record _rec_.
+It reads the "common_type" field. The _tep_ argument is the trace event parser
+context.
+
+The *tep_data_pid()* function gets the process id from the record _rec_.
+It reads the "common_pid" field. The _tep_ argument is the trace event parser
+context.
+
+The *tep_data_preempt_count()* function gets the preemption count from the
+record _rec_. It reads the "common_preempt_count" field. The _tep_ argument is
+the trace event parser context.
+
+The *tep_data_flags()* function gets the latency flags from the record _rec_.
+It reads the "common_flags" field. The _tep_ argument is the trace event parser
+context. Supported latency flags are:
+[verse]
+--
+	_TRACE_FLAG_IRQS_OFF_,		Interrupts are disabled.
+	_TRACE_FLAG_IRQS_NOSUPPORT_,	Reading IRQ flag is not supported by the architecture.
+	_TRACE_FLAG_NEED_RESCHED_,	Task needs rescheduling.
+	_TRACE_FLAG_HARDIRQ_,		Hard IRQ is running.
+	_TRACE_FLAG_SOFTIRQ_,		Soft IRQ is running.
+--
+
+RETURN VALUE
+------------
+The *tep_data_type()* function returns an integer, representing the event id.
+
+The *tep_data_pid()* function returns an integer, representing the process id
+
+The *tep_data_preempt_count()* function returns an integer, representing the
+preemption count.
+
+The *tep_data_flags()* function returns an integer, representing the latency
+flags. Look at the _trace_flag_type_ enum for supported flags.
+
+All these functions in case of an error return a negative integer.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+void process_record(struct tep_record *record)
+{
+	int data;
+
+	data = tep_data_type(tep, record);
+	if (data >= 0) {
+		/* Got the ID of the event */
+	}
+
+	data = tep_data_pid(tep, record);
+	if (data >= 0) {
+		/* Got the process ID */
+	}
+
+	data = tep_data_preempt_count(tep, record);
+	if (data >= 0) {
+		/* Got the preemption count */
+	}
+
+	data = tep_data_flags(tep, record);
+	if (data >= 0) {
+		/* Got the latency flags */
+	}
+}
+...
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-reg_event_handler.txt b/Documentation/libtraceevent-reg_event_handler.txt
new file mode 100644
index 0000000..90ab7f0
--- /dev/null
+++ b/Documentation/libtraceevent-reg_event_handler.txt
@@ -0,0 +1,156 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_register_event_handler, tep_unregister_event_handler -  Register /
+unregisters a callback function to parse an event information.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+enum *tep_reg_handler* {
+	_TEP_REGISTER_SUCCESS_,
+	_TEP_REGISTER_SUCCESS_OVERWRITE_,
+};
+
+int *tep_register_event_handler*(struct tep_handle pass:[*]_tep_, int _id_, const char pass:[*]_sys_name_, const char pass:[*]_event_name_, tep_event_handler_func _func_, void pass:[*]_context_);
+int *tep_unregister_event_handler*(struct tep_handle pass:[*]tep, int id, const char pass:[*]sys_name, const char pass:[*]event_name, tep_event_handler_func func, void pass:[*]_context_);
+
+typedef int (*pass:[*]tep_event_handler_func*)(struct trace_seq pass:[*]s, struct tep_record pass:[*]record, struct tep_event pass:[*]event, void pass:[*]context);
+--
+
+DESCRIPTION
+-----------
+The *tep_register_event_handler()* function registers a handler function,
+which is going to be called to parse the information for a given event.
+The _tep_ argument is the trace event parser context. The _id_ argument is
+the id of the event. The _sys_name_ argument is the name of the system,
+the event belongs to. The _event_name_ argument is the name of the event.
+If _id_ is >= 0, it is used to find the event, otherwise _sys_name_ and
+_event_name_ are used. The _func_ is a pointer to the function, which is going
+to be called to parse the event information. The _context_ argument is a pointer
+to the context data, which will be passed to the _func_. If a handler function
+for the same event is already registered, it will be overridden with the new
+one. This mechanism allows a developer to override the parsing of a given event.
+If for some reason the default print format is not sufficient, the developer
+can register a function for an event to be used to parse the data instead.
+
+The *tep_unregister_event_handler()* function unregisters the handler function,
+previously registered with *tep_register_event_handler()*. The _tep_ argument
+is the trace event parser context. The _id_, _sys_name_, _event_name_, _func_,
+and _context_ are the same arguments, as when the callback function _func_ was
+registered.
+
+The _tep_event_handler_func_ is the type of the custom event handler
+function. The _s_ argument is the trace sequence, it can be used to create a
+custom string, describing the event. A _record_  to get the event from is passed
+as input parameter and also the _event_ - the handle to the record's event. The
+_context_ is custom context, set when the custom event handler is registered.
+
+RETURN VALUE
+------------
+The *tep_register_event_handler()* function returns _TEP_REGISTER_SUCCESS_
+if the new handler is registered successfully or
+_TEP_REGISTER_SUCCESS_OVERWRITE_ if an existing handler is overwritten.
+If there is not  enough memory to complete the registration,
+TEP_ERRNO__MEM_ALLOC_FAILED is returned.
+
+The *tep_unregister_event_handler()* function returns 0 if _func_ was removed
+successful or, -1 if the event was not found.
+
+The _tep_event_handler_func_ should return -1 in case of an error,
+or 0 otherwise.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+#include <trace-seq.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+int timer_expire_handler(struct trace_seq *s, struct tep_record *record,
+			 struct tep_event *event, void *context)
+{
+	trace_seq_printf(s, "hrtimer=");
+
+	if (tep_print_num_field(s, "0x%llx", event, "timer", record, 0) == -1)
+		tep_print_num_field(s, "0x%llx", event, "hrtimer", record, 1);
+
+	trace_seq_printf(s, " now=");
+
+	tep_print_num_field(s, "%llu", event, "now", record, 1);
+
+	tep_print_func_field(s, " function=%s", event, "function", record, 0);
+
+	return 0;
+}
+...
+	int ret;
+
+	ret = tep_register_event_handler(tep, -1, "timer", "hrtimer_expire_entry",
+					 timer_expire_handler, NULL);
+	if (ret < 0) {
+		char buf[32];
+
+		tep_strerror(tep, ret, buf, 32)
+		printf("Failed to register handler for hrtimer_expire_entry: %s\n", buf);
+	} else {
+		switch (ret) {
+		case TEP_REGISTER_SUCCESS:
+			printf ("Registered handler for hrtimer_expire_entry\n");
+			break;
+		case TEP_REGISTER_SUCCESS_OVERWRITE:
+			printf ("Overwrote handler for hrtimer_expire_entry\n");
+			break;
+		}
+	}
+...
+	ret = tep_unregister_event_handler(tep, -1, "timer", "hrtimer_expire_entry",
+					   timer_expire_handler, NULL);
+	if ( ret )
+		printf ("Failed to unregister handler for hrtimer_expire_entry\n");
+
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*trace-seq.h*
+	Header file to include in order to have access to trace sequences
+	related APIs. Trace sequences are used to allow a function to call
+	several other functions to create a string of data to use.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-reg_print_func.txt b/Documentation/libtraceevent-reg_print_func.txt
new file mode 100644
index 0000000..b3c8491
--- /dev/null
+++ b/Documentation/libtraceevent-reg_print_func.txt
@@ -0,0 +1,155 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_register_print_function,tep_unregister_print_function -
+Registers / Unregisters a helper function.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+enum *tep_func_arg_type* {
+	TEP_FUNC_ARG_VOID,
+	TEP_FUNC_ARG_INT,
+	TEP_FUNC_ARG_LONG,
+	TEP_FUNC_ARG_STRING,
+	TEP_FUNC_ARG_PTR,
+	TEP_FUNC_ARG_MAX_TYPES
+};
+
+typedef unsigned long long (*pass:[*]tep_func_handler*)(struct trace_seq pass:[*]s, unsigned long long pass:[*]args);
+
+int *tep_register_print_function*(struct tep_handle pass:[*]_tep_, tep_func_handler _func_, enum tep_func_arg_type _ret_type_, char pass:[*]_name_, _..._);
+int *tep_unregister_print_function*(struct tep_handle pass:[*]_tep_, tep_func_handler _func_, char pass:[*]_name_);
+--
+
+DESCRIPTION
+-----------
+Some events may have helper functions in the print format arguments.
+This allows a plugin to dynamically create a way to process one of
+these functions.
+
+The *tep_register_print_function()* registers such helper function. The _tep_
+argument is the trace event parser context. The _func_ argument  is a pointer
+to the helper function. The _ret_type_ argument is  the return type of the
+helper function, value from the _tep_func_arg_type_ enum. The _name_ is the name
+of the helper function, as seen in the print format arguments. The _..._ is a
+variable list of _tep_func_arg_type_ enums, the _func_ function arguments.
+This list must end with _TEP_FUNC_ARG_VOID_. See 'EXAMPLE' section.
+
+The *tep_unregister_print_function()* unregisters a helper function, previously
+registered with *tep_register_print_function()*. The _tep_ argument is the
+trace event parser context. The _func_ and _name_ arguments are the same, used
+when the helper function was registered.
+
+The _tep_func_handler_ is the type of the helper function. The _s_ argument is
+the trace sequence, it can be used to create a custom string.
+The _args_  is a list of arguments, defined when the helper function was
+registered.
+
+RETURN VALUE
+------------
+The *tep_register_print_function()* function returns 0 in case of success.
+In case of an error, TEP_ERRNO_... code is returned.
+
+The *tep_unregister_print_function()* returns 0 in case of success, or -1 in
+case of an error.
+
+EXAMPLE
+-------
+Some events have internal functions calls, that appear in the print format
+output. For example "tracefs/events/i915/g4x_wm/format" has:
+[source,c]
+--
+print fmt: "pipe %c, frame=%u, scanline=%u, wm %d/%d/%d, sr %s/%d/%d/%d, hpll %s/%d/%d/%d, fbc %s",
+	    ((REC->pipe) + 'A'), REC->frame, REC->scanline, REC->primary,
+	    REC->sprite, REC->cursor, yesno(REC->cxsr), REC->sr_plane,
+	    REC->sr_cursor, REC->sr_fbc, yesno(REC->hpll), REC->hpll_plane,
+	    REC->hpll_cursor, REC->hpll_fbc, yesno(REC->fbc)
+--
+Notice the call to function *yesno()* in the print arguments. In the kernel
+context, this function has the following implementation:
+[source,c]
+--
+static const char *yesno(int x)
+{
+	static const char *yes = "yes";
+	static const char *no = "no";
+
+	return x ? yes : no;
+}
+--
+The user space event parser has no idea how to handle this *yesno()* function.
+The *tep_register_print_function()* API can be used to register a user space
+helper function, mapped to the kernel's *yesno()*:
+[source,c]
+--
+#include <event-parse.h>
+#include <trace-seq.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+static const char *yes_no_helper(int x)
+{
+	return x ? "yes" : "no";
+}
+...
+	if ( tep_register_print_function(tep,
+				    yes_no_helper,
+				    TEP_FUNC_ARG_STRING,
+				    "yesno",
+				    TEP_FUNC_ARG_INT,
+				    TEP_FUNC_ARG_VOID) != 0) {
+		/* Failed to register yes_no_helper function */
+	}
+
+/*
+   Now, when the event parser encounters this yesno() function, it will know
+   how to handle it.
+*/
+...
+	if (tep_unregister_print_function(tep, yes_no_helper, "yesno") != 0) {
+		/* Failed to unregister yes_no_helper function */
+	}
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*trace-seq.h*
+	Header file to include in order to have access to trace sequences
+	related APIs. Trace sequences are used to allow a function to call
+	several other functions to create a string of data to use.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-set_flag.txt b/Documentation/libtraceevent-set_flag.txt
new file mode 100644
index 0000000..c11dd00
--- /dev/null
+++ b/Documentation/libtraceevent-set_flag.txt
@@ -0,0 +1,104 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_set_flag, tep_clear_flag, tep_test_flag -
+Manage flags of trace event parser context.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+enum *tep_flag* {
+	_TEP_NSEC_OUTPUT_,
+	_TEP_DISABLE_SYS_PLUGINS_,
+	_TEP_DISABLE_PLUGINS_
+};
+void *tep_set_flag*(struct tep_handle pass:[*]_tep_, enum tep_flag _flag_);
+void *tep_clear_flag*(struct tep_handle pass:[*]_tep_, enum tep_flag _flag_);
+bool *tep_test_flag*(struct tep_handle pass:[*]_tep_, enum tep_flag _flag_);
+--
+
+DESCRIPTION
+-----------
+Trace event parser context flags are defined in *enum tep_flag*:
+[verse]
+--
+_TEP_NSEC_OUTPUT_ - print event's timestamp in nano seconds, instead of micro seconds.
+_TEP_DISABLE_SYS_PLUGINS_ - disable plugins, located in system's plugin
+			directory. This directory is defined at library compile
+			time, and usually depends on library installation
+			prefix: (install_preffix)/lib/traceevent/plugins
+_TEP_DISABLE_PLUGINS_ - disable all library plugins:
+			- in system's plugin directory
+			- in directory, defined by the environment variable _TRACEEVENT_PLUGIN_DIR_
+			- in user's home directory, _~/.traceevent/plugins_
+--
+Note: plugin related flags must me set before calling *tep_load_plugins()* API.
+
+The *tep_set_flag()* function sets _flag_ to _tep_ context.
+
+The *tep_clear_flag()* function clears _flag_ from _tep_ context.
+
+The *tep_test_flag()* function tests if _flag_ is set to _tep_ context.
+
+RETURN VALUE
+------------
+*tep_test_flag()* function returns true if _flag_ is set, false otherwise.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+/* Print timestamps in nanoseconds */
+tep_set_flag(tep,  TEP_NSEC_OUTPUT);
+...
+if (tep_test_flag(tep, TEP_NSEC_OUTPUT)) {
+	/* print timestamps in nanoseconds */
+} else {
+	/* print timestamps in microseconds */
+}
+...
+/* Print timestamps in microseconds */
+tep_clear_flag(tep, TEP_NSEC_OUTPUT);
+...
+--
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-strerror.txt b/Documentation/libtraceevent-strerror.txt
new file mode 100644
index 0000000..fa53344
--- /dev/null
+++ b/Documentation/libtraceevent-strerror.txt
@@ -0,0 +1,85 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_strerror - Returns a string describing regular errno and tep error number.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+int *tep_strerror*(struct tep_handle pass:[*]_tep_, enum tep_errno _errnum_, char pass:[*]_buf_, size_t _buflen_);
+
+--
+DESCRIPTION
+-----------
+The *tep_strerror()* function converts tep error number into a human
+readable string.
+The _tep_ argument is trace event parser context. The _errnum_ is a regular
+errno, defined in errno.h, or a tep error number. The string, describing this
+error number is copied in the _buf_ argument. The _buflen_ argument is
+the size of the _buf_.
+
+It as a thread safe wrapper around strerror_r(). The library function has two
+different behaviors - POSIX and GNU specific. The *tep_strerror()* API always
+behaves as the POSIX version - the error string is copied in the user supplied
+buffer.
+
+RETURN VALUE
+------------
+The *tep_strerror()* function returns 0, if a valid _errnum_ is passed and the
+string is copied into _buf_. If _errnum_ is not a valid error number,
+-1 is returned and _buf_ is not modified.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+char buf[32];
+char *pool = calloc(1, 128);
+if (tep == NULL) {
+	tep_strerror(tep, TEP_ERRNO__MEM_ALLOC_FAILED, buf, 32);
+	printf ("The pool is not initialized, %s", buf);
+}
+...
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent-tseq.txt b/Documentation/libtraceevent-tseq.txt
new file mode 100644
index 0000000..03dd748
--- /dev/null
+++ b/Documentation/libtraceevent-tseq.txt
@@ -0,0 +1,158 @@
+libtraceevent(3)
+================
+
+NAME
+----
+trace_seq_init, trace_seq_destroy, trace_seq_reset, trace_seq_terminate,
+trace_seq_putc, trace_seq_puts, trace_seq_printf, trace_seq_vprintf,
+trace_seq_do_fprintf, trace_seq_do_printf -
+Initialize / destroy a trace sequence.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+*#include <trace-seq.h>*
+
+void *trace_seq_init*(struct trace_seq pass:[*]_s_);
+void *trace_seq_destroy*(struct trace_seq pass:[*]_s_);
+void *trace_seq_reset*(struct trace_seq pass:[*]_s_);
+void *trace_seq_terminate*(struct trace_seq pass:[*]_s_);
+int *trace_seq_putc*(struct trace_seq pass:[*]_s_, unsigned char _c_);
+int *trace_seq_puts*(struct trace_seq pass:[*]_s_, const char pass:[*]_str_);
+int *trace_seq_printf*(struct trace_seq pass:[*]_s_, const char pass:[*]_fmt_, _..._);
+int *trace_seq_vprintf*(struct trace_seq pass:[*]_s_, const char pass:[*]_fmt_, va_list _args_);
+int *trace_seq_do_printf*(struct trace_seq pass:[*]_s_);
+int *trace_seq_do_fprintf*(struct trace_seq pass:[*]_s_, FILE pass:[*]_fp_);
+--
+
+DESCRIPTION
+-----------
+Trace sequences are used to allow a function to call several other functions
+to create a string of data to use.
+
+The *trace_seq_init()* function initializes the trace sequence _s_.
+
+The *trace_seq_destroy()* function destroys the trace sequence _s_ and frees
+all its resources that it had used.
+
+The *trace_seq_reset()* function re-initializes the trace sequence _s_. All
+characters already written in _s_ will be deleted.
+
+The *trace_seq_terminate()* function terminates the trace sequence _s_. It puts
+the null character pass:['\0'] at the end of the buffer.
+
+The *trace_seq_putc()* function puts a single character _c_ in the trace
+sequence _s_.
+
+The *trace_seq_puts()* function puts a NULL terminated string _str_ in the
+trace sequence _s_.
+
+The *trace_seq_printf()* function puts a formated string _fmt _with
+variable arguments _..._ in the trace sequence _s_.
+
+The *trace_seq_vprintf()* function puts a formated string _fmt _with
+list of arguments _args_ in the trace sequence _s_.
+
+The *trace_seq_do_printf()* function prints the buffer of trace sequence _s_ to
+the standard output stdout.
+
+The *trace_seq_do_fprintf()* function prints the buffer of trace sequence _s_
+to the given file _fp_.
+
+RETURN VALUE
+------------
+Both *trace_seq_putc()* and *trace_seq_puts()* functions return the number of
+characters put in the trace sequence, or 0 in case of an error
+
+Both *trace_seq_printf()* and *trace_seq_vprintf()* functions return 0 if the
+trace oversizes the buffer's free space, the number of characters printed, or
+a negative value in case of an error.
+
+Both *trace_seq_do_printf()* and *trace_seq_do_fprintf()* functions return the
+number of printed characters, or -1 in case of an error.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+#include <trace-seq.h>
+...
+struct trace_seq seq;
+trace_seq_init(&seq);
+...
+void foo_seq_print(struct trace_seq *tseq, char *format, ...)
+{
+	va_list ap;
+	va_start(ap, format);
+	if (trace_seq_vprintf(tseq, format, ap) <= 0) {
+		/* Failed to print in the trace sequence */
+	}
+	va_end(ap);
+}
+
+trace_seq_reset(&seq);
+
+char *str = " MAN page example";
+if (trace_seq_puts(&seq, str) != strlen(str)) {
+	/* Failed to put str in the trace sequence */
+}
+if (trace_seq_putc(&seq, ':') != 1) {
+	/* Failed to put ':' in the trace sequence */
+}
+if (trace_seq_printf(&seq, " trace sequence: %d", 1) <= 0) {
+	/* Failed to print in the trace sequence */
+}
+foo_seq_print( &seq, "  %d\n", 2);
+
+trace_seq_terminate(&seq);
+...
+
+if (trace_seq_do_printf(&seq) < 0 ) {
+	/* Failed to print the sequence buffer to the standard output */
+}
+FILE *fp = fopen("trace.txt", "w");
+if (trace_seq_do_fprintf(&seq, fp) < 0 ) [
+	/* Failed to print the sequence buffer to the trace.txt file */
+}
+
+trace_seq_destroy(&seq);
+...
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*trace-seq.h*
+	Header file to include in order to have access to trace sequences related APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*libtraceevent*(3), *trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/libtraceevent.txt b/Documentation/libtraceevent.txt
new file mode 100644
index 0000000..0502769
--- /dev/null
+++ b/Documentation/libtraceevent.txt
@@ -0,0 +1,246 @@
+libtraceevent(3)
+================
+
+NAME
+----
+libtraceevent - Linux kernel trace event library
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+Management of tep handler data structure and access of its members:
+	struct tep_handle pass:[*]*tep_alloc*(void);
+	void *tep_free*(struct tep_handle pass:[*]_tep_);
+	void *tep_ref*(struct tep_handle pass:[*]_tep_);
+	void *tep_unref*(struct tep_handle pass:[*]_tep_);
+	int *tep_get_ref*(struct tep_handle pass:[*]_tep_);
+	void *tep_set_flag*(struct tep_handle pass:[*]_tep_, enum tep_flag _flag_);
+	void *tep_clear_flag*(struct tep_handle pass:[*]_tep_, enum tep_flag _flag_);
+	bool *tep_test_flag*(struct tep_handle pass:[*]_tep_, enum tep_flag _flags_);
+	int *tep_get_cpus*(struct tep_handle pass:[*]_tep_);
+	void *tep_set_cpus*(struct tep_handle pass:[*]_tep_, int _cpus_);
+	int *tep_get_long_size*(strucqt tep_handle pass:[*]_tep_);
+	void *tep_set_long_size*(struct tep_handle pass:[*]_tep_, int _long_size_);
+	int *tep_get_page_size*(struct tep_handle pass:[*]_tep_);
+	void *tep_set_page_size*(struct tep_handle pass:[*]_tep_, int _page_size_);
+	int *tep_get_sub_buffer_size*(struct tep_handle pass:[*]_tep_);
+	int *tep_get_header_page_size*(struct tep_handle pass:[*]_tep_);
+	int *tep_get_header_timestamp_size*(struct tep_handle pass:[*]_tep_);
+	bool *tep_is_old_format*(struct tep_handle pass:[*]_tep_);
+	int *tep_strerror*(struct tep_handle pass:[*]_tep_, enum tep_errno _errnum_, char pass:[*]_buf_, size_t _buflen_);
+	struct kbuffer pass:[*]*tep_kbuffer*(struct tep_handle pass:[*]:_tep_);
+
+Register / unregister APIs:
+	int *tep_register_function*(struct tep_handle pass:[*]_tep_, char pass:[*]_name_, unsigned long long _addr_, char pass:[*]_mod_);
+	int *tep_register_event_handler*(struct tep_handle pass:[*]_tep_, int _id_, const char pass:[*]_sys_name_, const char pass:[*]_event_name_, tep_event_handler_func _func_, void pass:[*]_context_);
+	int *tep_unregister_event_handler*(struct tep_handle pass:[*]tep, int id, const char pass:[*]sys_name, const char pass:[*]event_name, tep_event_handler_func func, void pass:[*]_context_);
+	int *tep_register_print_string*(struct tep_handle pass:[*]_tep_, const char pass:[*]_fmt_, unsigned long long _addr_);
+	int *tep_register_print_function*(struct tep_handle pass:[*]_tep_, tep_func_handler _func_, enum tep_func_arg_type _ret_type_, char pass:[*]_name_, _..._);
+	int *tep_unregister_print_function*(struct tep_handle pass:[*]_tep_, tep_func_handler _func_, char pass:[*]_name_);
+	int *tep_get_function_count*(struct tep_handle *_tep_);
+
+Trace printk parsing:
+	void *tep_print_printk*(struct tep_handle pass:[*]tep);
+	void *tep_print_funcs*(struct tep_handle pass:[*]tep);
+	void *tep_set_test_filters*(struct tep_handle pass:[*]tep, int test_filters);
+	void *tep_plugin_print_options*(struct trace_seq pass:[*]s);
+	int *tep_plugin_add_option*(const char pass:[*]_name_, const char pass:[*]_val_);
+
+Meta data parsing:
+	int *tep_parse_saved_cmdlines*(struct tep_handle pass:[*]_tep_, const char pass:[*]_buf_);
+	int *tep_parse_printk_formats*(struct tep_handle pass:[*]_tep_, const char pass:[*]_buf_);
+	int *tep_parse_kallsyms*(struct tep_handle pass:[*]_tep_, const char pass:[*]_buf_);
+
+Plugins management:
+	struct tep_plugin_list pass:[*]*tep_load_plugins*(struct tep_handle pass:[*]_tep_);
+	void *tep_unload_plugins*(struct tep_plugin_list pass:[*]_plugin_list_, struct tep_handle pass:[*]_tep_);
+	char pass:[*]pass:[*]*tep_plugin_list_options*(void);
+	void *tep_plugin_free_options_list*(char pass:[*]pass:[*]_list_);
+	int *tep_plugin_add_options*(const char pass:[*]_name_, struct tep_plugin_option pass:[*]_options_);
+	void *tep_plugin_remove_options*(struct tep_plugin_option pass:[*]_options_);
+	void *tep_print_plugins*(struct trace_seq pass:[*]_s_, const char pass:[*]_prefix_, const char pass:[*]_suffix_, const struct tep_plugin_list pass:[*]_list_);
+	void *tep_load_plugins_hook*(struct tep_handle pass:[*]_tep_, const char pass:[*]_suffix_,
+			   void (pass:[*]_load_plugin_)(struct tep_handle pass:[*]tep,
+					       const char pass:[*]path,
+					       const char pass:[*]name,
+					       void pass:[*]data),
+			   void pass:[*]_data_);
+	int *tep_add_plugin_path*(struct tep_handle pass:[*]tep, char pass:[*]path,
+			  enum tep_plugin_load_priority prio);
+
+Event related APIs:
+	struct tep_event pass:[*]*tep_get_event*(struct tep_handle pass:[*]_tep_, int _index_);
+	struct tep_event pass:[*]*tep_get_first_event*(struct tep_handle pass:[*]_tep_);
+	int *tep_get_events_count*(struct tep_handle pass:[*]_tep_);
+	struct tep_event pass:[*]pass:[*]*tep_list_events*(struct tep_handle pass:[*]_tep_, enum tep_event_sort_type _sort_type_);
+	struct tep_event pass:[*]pass:[*]*tep_list_events_copy*(struct tep_handle pass:[*]_tep_, enum tep_event_sort_type _sort_type_);
+	void *tep_print_event*(struct tep_handle pass:[*]_tep_, struct trace_seq pass:[*]_s_, struct tep_record pass:[*]_record_, const char pass:[*]_fmt_, _..._);
+
+Event finding:
+	struct tep_event pass:[*]*tep_find_event*(struct tep_handle pass:[*]_tep_, int _id_);
+	struct tep_event pass:[*]*tep_find_event_by_name*(struct tep_handle pass:[*]_tep_, const char pass:[*]_sys_, const char pass:[*]_name_);
+	struct tep_event pass:[*]*tep_find_event_by_record*(struct tep_handle pass:[*]_tep_, struct tep_record pass:[*]_record_);
+
+Parsing of event files:
+	int *tep_parse_header_page*(struct tep_handle pass:[*]_tep_, char pass:[*]_buf_, unsigned long _size_, int _long_size_);
+	enum tep_errno *tep_parse_event*(struct tep_handle pass:[*]_tep_, const char pass:[*]_buf_, unsigned long _size_, const char pass:[*]_sys_);
+	enum tep_errno *tep_parse_format*(struct tep_handle pass:[*]_tep_, struct tep_event pass:[*]pass:[*]_eventp_, const char pass:[*]_buf_, unsigned long _size_, const char pass:[*]_sys_);
+
+APIs related to fields from event's format files:
+	struct tep_format_field pass:[*]pass:[*]*tep_event_common_fields*(struct tep_event pass:[*]_event_);
+	struct tep_format_field pass:[*]pass:[*]*tep_event_fields*(struct tep_event pass:[*]_event_);
+	void pass:[*]*tep_get_field_raw*(struct trace_seq pass:[*]_s_, struct tep_event pass:[*]_event_, const char pass:[*]_name_, struct tep_record pass:[*]_record_, int pass:[*]_len_, int _err_);
+	int *tep_get_field_val*(struct trace_seq pass:[*]_s_, struct tep_event pass:[*]_event_, const char pass:[*]_name_, struct tep_record pass:[*]_record_, unsigned long long pass:[*]_val_, int _err_);
+	int *tep_get_common_field_val*(struct trace_seq pass:[*]_s_, struct tep_event pass:[*]_event_, const char pass:[*]_name_, struct tep_record pass:[*]_record_, unsigned long long pass:[*]_val_, int _err_);
+	int *tep_get_any_field_val*(struct trace_seq pass:[*]_s_, struct tep_event pass:[*]_event_, const char pass:[*]_name_, struct tep_record pass:[*]_record_, unsigned long long pass:[*]_val_, int _err_);
+	int *tep_read_number_field*(struct tep_format_field pass:[*]_field_, const void pass:[*]_data_, unsigned long long pass:[*]_value_);
+
+Event fields printing:
+	void *tep_print_field_content*(struct trace_seq pass:[*]_s_, void pass:[*]_data_, int size, struct tep_format_field pass:[*]_field_);
+	void *tep_print_fields*(struct trace_seq pass:[*]_s_, void pass:[*]_data_, int _size_, struct tep_event pass:[*]_event_);
+	int *tep_print_num_field*(struct trace_seq pass:[*]_s_, const char pass:[*]_fmt_, struct tep_event pass:[*]_event_, const char pass:[*]_name_, struct tep_record pass:[*]_record_, int _err_);
+	int *tep_print_func_field*(struct trace_seq pass:[*]_s_, const char pass:[*]_fmt_, struct tep_event pass:[*]_event_, const char pass:[*]_name_, struct tep_record pass:[*]_record_, int _err_);
+	void *tep_record_print_fields*(struct trace_seq pass:[*]_s_, struct tep_record pass:[*]_record_, struct tep_event pass:[*]_event_);
+	void *tep_record_print_selected_fields*(struct trace_seq pass:[*]_s_, struct tep_record pass:[*]_record_, struct tep_event pass:[*]_event_, int _select_mask_);
+
+Event fields finding:
+	struct tep_format_field pass:[*]*tep_find_common_field*(struct tep_event pass:[*]_event_, const char pass:[*]_name_);
+	struct tep_format_field pass:[*]*tep_find_field*(struct tep_event_ormat pass:[*]_event_, const char pass:[*]_name_);
+	struct tep_format_field pass:[*]*tep_find_any_field*(struct tep_event pass:[*]_event_, const char pass:[*]_name_);
+
+Functions resolver:
+	int *tep_set_function_resolver*(struct tep_handle pass:[*]_tep_, tep_func_resolver_t pass:[*]_func_, void pass:[*]_priv_);
+	void *tep_reset_function_resolver*(struct tep_handle pass:[*]_tep_);
+	const char pass:[*]*tep_find_function*(struct tep_handle pass:[*]_tep_, unsigned long long _addr_);
+	unsigned long long *tep_find_function_address*(struct tep_handle pass:[*]_tep_, unsigned long long _addr_);
+	int *tep_find_function_info*(struct tep_handle pass:[*]_tep_, unsigned long long _addr_, const char pass:[**]_name_,
+			   unsigned long long pass:[*]_start_, unsigned long pass:[*]_size_);
+
+Filter management:
+	struct tep_event_filter pass:[*]*tep_filter_alloc*(struct tep_handle pass:[*]_tep_);
+	enum tep_errno *tep_filter_add_filter_str*(struct tep_event_filter pass:[*]_filter_, const char pass:[*]_filter_str_);
+	enum tep_errno *tep_filter_match*(struct tep_event_filter pass:[*]_filter_, struct tep_record pass:[*]_record_);
+	int *tep_filter_strerror*(struct tep_event_filter pass:[*]_filter_, enum tep_errno _err_, char pass:[*]buf, size_t _buflen_);
+	int *tep_event_filtered*(struct tep_event_filter pass:[*]_filter_, int _event_id_);
+	void *tep_filter_reset*(struct tep_event_filter pass:[*]_filter_);
+	void *tep_filter_free*(struct tep_event_filter pass:[*]_filter_);
+	char pass:[*]*tep_filter_make_string*(struct tep_event_filter pass:[*]_filter_, int _event_id_);
+	int *tep_filter_remove_event*(struct tep_event_filter pass:[*]_filter_, int _event_id_);
+	int *tep_filter_copy*(struct tep_event_filter pass:[*]_dest_, struct tep_event_filter pass:[*]_source_);
+	int *tep_filter_compare*(struct tep_event_filter pass:[*]_filter1_, struct tep_event_filter pass:[*]_filter2_);
+
+Parsing various data from the records:
+	int *tep_data_type*(struct tep_handle pass:[*]_tep_, struct tep_record pass:[*]_rec_);
+	int *tep_data_pid*(struct tep_handle pass:[*]_tep_, struct tep_record pass:[*]_rec_);
+	int *tep_data_preempt_count*(struct tep_handle pass:[*]_tep_, struct tep_record pass:[*]_rec_);
+	int *tep_data_flags*(struct tep_handle pass:[*]_tep_, struct tep_record pass:[*]_rec_);
+
+Command and task related APIs:
+	const char pass:[*]*tep_data_comm_from_pid*(struct tep_handle pass:[*]_tep_, int _pid_);
+	struct cmdline pass:[*]*tep_data_pid_from_comm*(struct tep_handle pass:[*]_tep_, const char pass:[*]_comm_, struct cmdline pass:[*]_next_);
+	int *tep_register_comm*(struct tep_handle pass:[*]_tep_, const char pass:[*]_comm_, int _pid_);
+	int *tep_override_comm*(struct tep_handle pass:[*]_tep_, const char pass:[*]_comm_, int _pid_);
+	bool *tep_is_pid_registered*(struct tep_handle pass:[*]_tep_, int _pid_);
+	int *tep_cmdline_pid*(struct tep_handle pass:[*]_tep_, struct cmdline pass:[*]_cmdline_);
+
+Endian related APIs:
+	int *tep_is_bigendian*(void);
+	unsigned long long *tep_read_number*(struct tep_handle pass:[*]_tep_, const void pass:[*]_ptr_, int _size_);
+	bool *tep_is_file_bigendian*(struct tep_handle pass:[*]_tep_);
+	void *tep_set_file_bigendian*(struct tep_handle pass:[*]_tep_, enum tep_endian _endian_);
+	bool *tep_is_local_bigendian*(struct tep_handle pass:[*]_tep_);
+	void *tep_set_local_bigendian*(struct tep_handle pass:[*]_tep_, enum tep_endian _endian_);
+
+Control library logs:
+	int *tep_set_loglevel*(enum tep_loglevel _level_);
+
+KVM plugin calllbacks: (Defined by the application and complied with -rdynamic)
+	const char pass:[*]*tep_plugin_kvm_get_func*(struct tep_event pass:[*]event,
+				    struct tep_record pass:[*]record,
+				    unsigned long long pass:[*]paddr);
+	void *tep_plugin_kvm_put_func*(const char pass:[*]func);
+
+Trace sequences:
+*#include <trace-seq.h>*
+	void *trace_seq_init*(struct trace_seq pass:[*]_s_);
+	void *trace_seq_reset*(struct trace_seq pass:[*]_s_);
+	void *trace_seq_destroy*(struct trace_seq pass:[*]_s_);
+	int *trace_seq_printf*(struct trace_seq pass:[*]_s_, const char pass:[*]_fmt_, ...);
+	int *trace_seq_vprintf*(struct trace_seq pass:[*]_s_, const char pass:[*]_fmt_, va_list _args_);
+	int *trace_seq_puts*(struct trace_seq pass:[*]_s_, const char pass:[*]_str_);
+	int *trace_seq_putc*(struct trace_seq pass:[*]_s_, unsigned char _c_);
+	void *trace_seq_terminate*(struct trace_seq pass:[*]_s_);
+	int *trace_seq_do_fprintf*(struct trace_seq pass:[*]_s_, FILE pass:[*]_fp_);
+	int *trace_seq_do_printf*(struct trace_seq pass:[*]_s_);
+
+kbuffer parsing:
+#include <kbuffer.h>
+	struct kbuffer pass:[*]*kbuffer_alloc*(enum kbuffer_long_size _size_, enum kbuffer_endian _endian_);
+	void *kbuffer_free*(struct kbuffer pass:[*]_kbuf_);
+	int *kbuffer_load_subbuffer*(struct kbuffer pass:[*]_kbuf_, void pass:[*]_subbuffer_);
+	int *kbuffer_subbuffer_size*(struct kbuffer pass:[*]_kbuf);
+	int *kbuffer_start_of_data*(struct kbuffer pass:[*]_kbuf_);
+	unsigned long long *kbuffer_timestamp*(struct kbuffer pass:[*]_kbuf_);
+	unsigned long long *kbuffer_subbuf_timestamp*(struct kbuffer pass:[*]_kbuf_, void pass:[*]_subbuf_);
+	void pass:[*]*kbuffer_read_event*(struct kbuffer pass:[*]_kbuf_, unsigned long long pass:[*]_ts_);
+	void pass:[*]*kbuffer_next_event*(struct kbuffer pass:[*]_kbuf_, unsigned long long pass:[*]_ts_);
+	void pass:[*]*kbuffer_read_at_offset*(struct kbuffer pass:[*]_kbuf_, int _offset_, unsigned long long pass:[*]_ts_);
+	int *kbuffer_missed_events*(struct kbuffer pass:[*]_kbuf_);
+	int *kbuffer_event_size*(struct kbuffer pass:[*]_kbuf_);
+	int *kbuffer_curr_size*(struct kbuffer pass:[*]_kbuf_);
+	int *kbuffer_curr_offset*(struct kbuffer pass:[*]_kbuf_);
+	int *kbuffer_curr_index*(struct kbuffer pass:[*]_kbuf_);
+--
+
+DESCRIPTION
+-----------
+The libtraceevent(3) library provides APIs to access kernel tracepoint events,
+located in the tracefs file system under the events directory.
+
+ENVIRONMENT
+-----------
+[verse]
+--
+TRACEEVENT_PLUGIN_DIR
+	Additional plugin directory. All shared object files, located in this directory will be loaded as traceevent plugins.
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*trace-seq.h*
+	Header file to include in order to have access to trace sequences related APIs.
+	Trace sequences are used to allow a function to call several other functions
+	to create a string of data to use.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+*trace-cmd*(1)
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
diff --git a/Documentation/manpage-1.72.xsl b/Documentation/manpage-1.72.xsl
new file mode 100644
index 0000000..b4d315c
--- /dev/null
+++ b/Documentation/manpage-1.72.xsl
@@ -0,0 +1,14 @@
+<!-- manpage-1.72.xsl:
+     special settings for manpages rendered from asciidoc+docbook
+     handles peculiarities in docbook-xsl 1.72.0 -->
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+		version="1.0">
+
+<xsl:import href="manpage-base.xsl"/>
+
+<!-- these are the special values for the roff control characters
+     needed for docbook-xsl 1.72.0 -->
+<xsl:param name="git.docbook.backslash">&#x2593;</xsl:param>
+<xsl:param name="git.docbook.dot"      >&#x2302;</xsl:param>
+
+</xsl:stylesheet>
diff --git a/Documentation/manpage-base.xsl b/Documentation/manpage-base.xsl
new file mode 100644
index 0000000..a264fa6
--- /dev/null
+++ b/Documentation/manpage-base.xsl
@@ -0,0 +1,35 @@
+<!-- manpage-base.xsl:
+     special formatting for manpages rendered from asciidoc+docbook -->
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+		version="1.0">
+
+<!-- these params silence some output from xmlto -->
+<xsl:param name="man.output.quietly" select="1"/>
+<xsl:param name="refentry.meta.get.quietly" select="1"/>
+
+<!-- convert asciidoc callouts to man page format;
+     git.docbook.backslash and git.docbook.dot params
+     must be supplied by another XSL file or other means -->
+<xsl:template match="co">
+	<xsl:value-of select="concat(
+			      $git.docbook.backslash,'fB(',
+			      substring-after(@id,'-'),')',
+			      $git.docbook.backslash,'fR')"/>
+</xsl:template>
+<xsl:template match="calloutlist">
+	<xsl:value-of select="$git.docbook.dot"/>
+	<xsl:text>sp&#10;</xsl:text>
+	<xsl:apply-templates/>
+	<xsl:text>&#10;</xsl:text>
+</xsl:template>
+<xsl:template match="callout">
+	<xsl:value-of select="concat(
+			      $git.docbook.backslash,'fB',
+			      substring-after(@arearefs,'-'),
+			      '. ',$git.docbook.backslash,'fR')"/>
+	<xsl:apply-templates/>
+	<xsl:value-of select="$git.docbook.dot"/>
+	<xsl:text>br&#10;</xsl:text>
+</xsl:template>
+
+</xsl:stylesheet>
diff --git a/Documentation/manpage-bold-literal.xsl b/Documentation/manpage-bold-literal.xsl
new file mode 100644
index 0000000..608eb5d
--- /dev/null
+++ b/Documentation/manpage-bold-literal.xsl
@@ -0,0 +1,17 @@
+<!-- manpage-bold-literal.xsl:
+     special formatting for manpages rendered from asciidoc+docbook -->
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+		version="1.0">
+
+<!-- render literal text as bold (instead of plain or monospace);
+     this makes literal text easier to distinguish in manpages
+     viewed on a tty -->
+<xsl:template match="literal">
+	<xsl:value-of select="$git.docbook.backslash"/>
+	<xsl:text>fB</xsl:text>
+	<xsl:apply-templates/>
+	<xsl:value-of select="$git.docbook.backslash"/>
+	<xsl:text>fR</xsl:text>
+</xsl:template>
+
+</xsl:stylesheet>
diff --git a/Documentation/manpage-normal.xsl b/Documentation/manpage-normal.xsl
new file mode 100644
index 0000000..a48f5b1
--- /dev/null
+++ b/Documentation/manpage-normal.xsl
@@ -0,0 +1,13 @@
+<!-- manpage-normal.xsl:
+     special settings for manpages rendered from asciidoc+docbook
+     handles anything we want to keep away from docbook-xsl 1.72.0 -->
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+		version="1.0">
+
+<xsl:import href="manpage-base.xsl"/>
+
+<!-- these are the normal values for the roff control characters -->
+<xsl:param name="git.docbook.backslash">\</xsl:param>
+<xsl:param name="git.docbook.dot"	>.</xsl:param>
+
+</xsl:stylesheet>
diff --git a/Documentation/manpage-suppress-sp.xsl b/Documentation/manpage-suppress-sp.xsl
new file mode 100644
index 0000000..a63c763
--- /dev/null
+++ b/Documentation/manpage-suppress-sp.xsl
@@ -0,0 +1,21 @@
+<!-- manpage-suppress-sp.xsl:
+     special settings for manpages rendered from asciidoc+docbook
+     handles erroneous, inline .sp in manpage output of some
+     versions of docbook-xsl -->
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+		version="1.0">
+
+<!-- attempt to work around spurious .sp at the tail of the line
+     that some versions of docbook stylesheets seem to add -->
+<xsl:template match="simpara">
+  <xsl:variable name="content">
+    <xsl:apply-templates/>
+  </xsl:variable>
+  <xsl:value-of select="normalize-space($content)"/>
+  <xsl:if test="not(ancestor::authorblurb) and
+                not(ancestor::personblurb)">
+    <xsl:text>&#10;&#10;</xsl:text>
+  </xsl:if>
+</xsl:template>
+
+</xsl:stylesheet>
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..915311d
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,865 @@
+Valid-License-Identifier: GPL-2.0
+Valid-License-Identifier: GPL-2.0-only
+Valid-License-Identifier: GPL-2.0+
+Valid-License-Identifier: GPL-2.0-or-later
+SPDX-URL: https://spdx.org/licenses/GPL-2.0.html
+Usage-Guide:
+  To use this license in source code, put one of the following SPDX
+  tag/value pairs into a comment according to the placement
+  guidelines in the licensing rules documentation.
+  For 'GNU General Public License (GPL) version 2 only' use:
+    SPDX-License-Identifier: GPL-2.0
+  or
+    SPDX-License-Identifier: GPL-2.0-only
+  For 'GNU General Public License (GPL) version 2 or any later version' use:
+    SPDX-License-Identifier: GPL-2.0+
+  or
+    SPDX-License-Identifier: GPL-2.0-or-later
+License-Text:
+
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+                       51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+			    Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+  Finally, any free program is threatened constantly by software
+patents.  We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary.  To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+		    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language.  (Hereinafter, translation is included without limitation in
+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+  2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+    a) You must cause the modified files to carry prominent notices
+    stating that you changed the files and the date of any change.
+
+    b) You must cause any work that you distribute or publish, that in
+    whole or in part contains or is derived from the Program or any
+    part thereof, to be licensed as a whole at no charge to all third
+    parties under the terms of this License.
+
+    c) If the modified program normally reads commands interactively
+    when run, you must cause it, when started running for such
+    interactive use in the most ordinary way, to print or display an
+    announcement including an appropriate copyright notice and a
+    notice that there is no warranty (or else, saying that you provide
+    a warranty) and that users may redistribute the program under
+    these conditions, and telling the user how to view a copy of this
+    License.  (Exception: if the Program itself is interactive but
+    does not normally print such an announcement, your work based on
+    the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works.  But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+  3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+    a) Accompany it with the complete corresponding machine-readable
+    source code, which must be distributed under the terms of Sections
+    1 and 2 above on a medium customarily used for software interchange; or,
+
+    b) Accompany it with a written offer, valid for at least three
+    years, to give any third party, for a charge no more than your
+    cost of physically performing source distribution, a complete
+    machine-readable copy of the corresponding source code, to be
+    distributed under the terms of Sections 1 and 2 above on a medium
+    customarily used for software interchange; or,
+
+    c) Accompany it with the information you received as to the offer
+    to distribute corresponding source code.  (This alternative is
+    allowed only for noncommercial distribution and only if you
+    received the program in object code or executable form with such
+    an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it.  For an executable work, complete source
+code means all the source code for all modules it contains, plus any
+associated interface definition files, plus the scripts used to
+control compilation and installation of the executable.  However, as a
+special exception, the source code distributed need not include
+anything that is normally distributed (in either source or binary
+form) with the major components (compiler, kernel, and so on) of the
+operating system on which the executable runs, unless that component
+itself accompanies the executable.
+
+If distribution of executable or object code is made by offering
+access to copy from a designated place, then offering equivalent
+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+  4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License.  Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+  5. You are not required to accept this License, since you have not
+signed it.  However, nothing else grants you permission to modify or
+distribute the Program or its derivative works.  These actions are
+prohibited by law if you do not accept this License.  Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+  6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions.  You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+  7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all.  For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices.  Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+			    NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+		     END OF TERMS AND CONDITIONS
+
+	    How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Library General
+Public License instead of this License.
+
+-------------------------------------------------------------------------
+
+Valid-License-Identifier: LGPL-2.1
+Valid-License-Identifier: LGPL-2.1+
+SPDX-URL: https://spdx.org/licenses/LGPL-2.1.html
+Usage-Guide:
+  To use this license in source code, put one of the following SPDX
+  tag/value pairs into a comment according to the placement
+  guidelines in the licensing rules documentation.
+  For 'GNU Lesser General Public License (LGPL) version 2.1 only' use:
+    SPDX-License-Identifier: LGPL-2.1
+  For 'GNU Lesser General Public License (LGPL) version 2.1 or any later
+  version' use:
+    SPDX-License-Identifier: LGPL-2.1+
+License-Text:
+
+GNU LESSER GENERAL PUBLIC LICENSE
+Version 2.1, February 1999
+
+Copyright (C) 1991, 1999 Free Software Foundation, Inc.
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+[This is the first released version of the Lesser GPL. It also counts as
+the successor of the GNU Library Public License, version 2, hence the
+version number 2.1.]
+
+Preamble
+
+The licenses for most software are designed to take away your freedom to
+share and change it. By contrast, the GNU General Public Licenses are
+intended to guarantee your freedom to share and change free software--to
+make sure the software is free for all its users.
+
+This license, the Lesser General Public License, applies to some specially
+designated software packages--typically libraries--of the Free Software
+Foundation and other authors who decide to use it. You can use it too, but
+we suggest you first think carefully about whether this license or the
+ordinary General Public License is the better strategy to use in any
+particular case, based on the explanations below.
+
+When we speak of free software, we are referring to freedom of use, not
+price. Our General Public Licenses are designed to make sure that you have
+the freedom to distribute copies of free software (and charge for this
+service if you wish); that you receive source code or can get it if you
+want it; that you can change the software and use pieces of it in new free
+programs; and that you are informed that you can do these things.
+
+To protect your rights, we need to make restrictions that forbid
+distributors to deny you these rights or to ask you to surrender these
+rights. These restrictions translate to certain responsibilities for you if
+you distribute copies of the library or if you modify it.
+
+For example, if you distribute copies of the library, whether gratis or for
+a fee, you must give the recipients all the rights that we gave you. You
+must make sure that they, too, receive or can get the source code. If you
+link other code with the library, you must provide complete object files to
+the recipients, so that they can relink them with the library after making
+changes to the library and recompiling it. And you must show them these
+terms so they know their rights.
+
+We protect your rights with a two-step method: (1) we copyright the
+library, and (2) we offer you this license, which gives you legal
+permission to copy, distribute and/or modify the library.
+
+To protect each distributor, we want to make it very clear that there is no
+warranty for the free library. Also, if the library is modified by someone
+else and passed on, the recipients should know that what they have is not
+the original version, so that the original author's reputation will not be
+affected by problems that might be introduced by others.
+
+Finally, software patents pose a constant threat to the existence of any
+free program. We wish to make sure that a company cannot effectively
+restrict the users of a free program by obtaining a restrictive license
+from a patent holder. Therefore, we insist that any patent license obtained
+for a version of the library must be consistent with the full freedom of
+use specified in this license.
+
+Most GNU software, including some libraries, is covered by the ordinary GNU
+General Public License. This license, the GNU Lesser General Public
+License, applies to certain designated libraries, and is quite different
+from the ordinary General Public License. We use this license for certain
+libraries in order to permit linking those libraries into non-free
+programs.
+
+When a program is linked with a library, whether statically or using a
+shared library, the combination of the two is legally speaking a combined
+work, a derivative of the original library. The ordinary General Public
+License therefore permits such linking only if the entire combination fits
+its criteria of freedom. The Lesser General Public License permits more lax
+criteria for linking other code with the library.
+
+We call this license the "Lesser" General Public License because it does
+Less to protect the user's freedom than the ordinary General Public
+License. It also provides other free software developers Less of an
+advantage over competing non-free programs. These disadvantages are the
+reason we use the ordinary General Public License for many
+libraries. However, the Lesser license provides advantages in certain
+special circumstances.
+
+For example, on rare occasions, there may be a special need to encourage
+the widest possible use of a certain library, so that it becomes a de-facto
+standard. To achieve this, non-free programs must be allowed to use the
+library. A more frequent case is that a free library does the same job as
+widely used non-free libraries. In this case, there is little to gain by
+limiting the free library to free software only, so we use the Lesser
+General Public License.
+
+In other cases, permission to use a particular library in non-free programs
+enables a greater number of people to use a large body of free
+software. For example, permission to use the GNU C Library in non-free
+programs enables many more people to use the whole GNU operating system, as
+well as its variant, the GNU/Linux operating system.
+
+Although the Lesser General Public License is Less protective of the users'
+freedom, it does ensure that the user of a program that is linked with the
+Library has the freedom and the wherewithal to run that program using a
+modified version of the Library.
+
+The precise terms and conditions for copying, distribution and modification
+follow. Pay close attention to the difference between a "work based on the
+library" and a "work that uses the library". The former contains code
+derived from the library, whereas the latter must be combined with the
+library in order to run.
+
+TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+0. This License Agreement applies to any software library or other program
+   which contains a notice placed by the copyright holder or other
+   authorized party saying it may be distributed under the terms of this
+   Lesser General Public License (also called "this License"). Each
+   licensee is addressed as "you".
+
+   A "library" means a collection of software functions and/or data
+   prepared so as to be conveniently linked with application programs
+   (which use some of those functions and data) to form executables.
+
+   The "Library", below, refers to any such software library or work which
+   has been distributed under these terms. A "work based on the Library"
+   means either the Library or any derivative work under copyright law:
+   that is to say, a work containing the Library or a portion of it, either
+   verbatim or with modifications and/or translated straightforwardly into
+   another language. (Hereinafter, translation is included without
+   limitation in the term "modification".)
+
+   "Source code" for a work means the preferred form of the work for making
+   modifications to it. For a library, complete source code means all the
+   source code for all modules it contains, plus any associated interface
+   definition files, plus the scripts used to control compilation and
+   installation of the library.
+
+    Activities other than copying, distribution and modification are not
+    covered by this License; they are outside its scope. The act of running
+    a program using the Library is not restricted, and output from such a
+    program is covered only if its contents constitute a work based on the
+    Library (independent of the use of the Library in a tool for writing
+    it). Whether that is true depends on what the Library does and what the
+    program that uses the Library does.
+
+1. You may copy and distribute verbatim copies of the Library's complete
+   source code as you receive it, in any medium, provided that you
+   conspicuously and appropriately publish on each copy an appropriate
+   copyright notice and disclaimer of warranty; keep intact all the notices
+   that refer to this License and to the absence of any warranty; and
+   distribute a copy of this License along with the Library.
+
+   You may charge a fee for the physical act of transferring a copy, and
+   you may at your option offer warranty protection in exchange for a fee.
+
+2. You may modify your copy or copies of the Library or any portion of it,
+   thus forming a work based on the Library, and copy and distribute such
+   modifications or work under the terms of Section 1 above, provided that
+   you also meet all of these conditions:
+
+   a) The modified work must itself be a software library.
+
+   b) You must cause the files modified to carry prominent notices stating
+      that you changed the files and the date of any change.
+
+   c) You must cause the whole of the work to be licensed at no charge to
+      all third parties under the terms of this License.
+
+   d) If a facility in the modified Library refers to a function or a table
+      of data to be supplied by an application program that uses the
+      facility, other than as an argument passed when the facility is
+      invoked, then you must make a good faith effort to ensure that, in
+      the event an application does not supply such function or table, the
+      facility still operates, and performs whatever part of its purpose
+      remains meaningful.
+
+   (For example, a function in a library to compute square roots has a
+    purpose that is entirely well-defined independent of the
+    application. Therefore, Subsection 2d requires that any
+    application-supplied function or table used by this function must be
+    optional: if the application does not supply it, the square root
+    function must still compute square roots.)
+
+   These requirements apply to the modified work as a whole. If
+   identifiable sections of that work are not derived from the Library, and
+   can be reasonably considered independent and separate works in
+   themselves, then this License, and its terms, do not apply to those
+   sections when you distribute them as separate works. But when you
+   distribute the same sections as part of a whole which is a work based on
+   the Library, the distribution of the whole must be on the terms of this
+   License, whose permissions for other licensees extend to the entire
+   whole, and thus to each and every part regardless of who wrote it.
+
+   Thus, it is not the intent of this section to claim rights or contest
+   your rights to work written entirely by you; rather, the intent is to
+   exercise the right to control the distribution of derivative or
+   collective works based on the Library.
+
+   In addition, mere aggregation of another work not based on the Library
+   with the Library (or with a work based on the Library) on a volume of a
+   storage or distribution medium does not bring the other work under the
+   scope of this License.
+
+3. You may opt to apply the terms of the ordinary GNU General Public
+   License instead of this License to a given copy of the Library. To do
+   this, you must alter all the notices that refer to this License, so that
+   they refer to the ordinary GNU General Public License, version 2,
+   instead of to this License. (If a newer version than version 2 of the
+   ordinary GNU General Public License has appeared, then you can specify
+   that version instead if you wish.) Do not make any other change in these
+   notices.
+
+   Once this change is made in a given copy, it is irreversible for that
+   copy, so the ordinary GNU General Public License applies to all
+   subsequent copies and derivative works made from that copy.
+
+   This option is useful when you wish to copy part of the code of the
+   Library into a program that is not a library.
+
+4. You may copy and distribute the Library (or a portion or derivative of
+   it, under Section 2) in object code or executable form under the terms
+   of Sections 1 and 2 above provided that you accompany it with the
+   complete corresponding machine-readable source code, which must be
+   distributed under the terms of Sections 1 and 2 above on a medium
+   customarily used for software interchange.
+
+   If distribution of object code is made by offering access to copy from a
+   designated place, then offering equivalent access to copy the source
+   code from the same place satisfies the requirement to distribute the
+   source code, even though third parties are not compelled to copy the
+   source along with the object code.
+
+5. A program that contains no derivative of any portion of the Library, but
+   is designed to work with the Library by being compiled or linked with
+   it, is called a "work that uses the Library". Such a work, in isolation,
+   is not a derivative work of the Library, and therefore falls outside the
+   scope of this License.
+
+   However, linking a "work that uses the Library" with the Library creates
+   an executable that is a derivative of the Library (because it contains
+   portions of the Library), rather than a "work that uses the
+   library". The executable is therefore covered by this License. Section 6
+   states terms for distribution of such executables.
+
+   When a "work that uses the Library" uses material from a header file
+   that is part of the Library, the object code for the work may be a
+   derivative work of the Library even though the source code is
+   not. Whether this is true is especially significant if the work can be
+   linked without the Library, or if the work is itself a library. The
+   threshold for this to be true is not precisely defined by law.
+
+   If such an object file uses only numerical parameters, data structure
+   layouts and accessors, and small macros and small inline functions (ten
+   lines or less in length), then the use of the object file is
+   unrestricted, regardless of whether it is legally a derivative
+   work. (Executables containing this object code plus portions of the
+   Library will still fall under Section 6.)
+
+   Otherwise, if the work is a derivative of the Library, you may
+   distribute the object code for the work under the terms of Section
+   6. Any executables containing that work also fall under Section 6,
+   whether or not they are linked directly with the Library itself.
+
+6. As an exception to the Sections above, you may also combine or link a
+   "work that uses the Library" with the Library to produce a work
+   containing portions of the Library, and distribute that work under terms
+   of your choice, provided that the terms permit modification of the work
+   for the customer's own use and reverse engineering for debugging such
+   modifications.
+
+   You must give prominent notice with each copy of the work that the
+   Library is used in it and that the Library and its use are covered by
+   this License. You must supply a copy of this License. If the work during
+   execution displays copyright notices, you must include the copyright
+   notice for the Library among them, as well as a reference directing the
+   user to the copy of this License. Also, you must do one of these things:
+
+   a) Accompany the work with the complete corresponding machine-readable
+      source code for the Library including whatever changes were used in
+      the work (which must be distributed under Sections 1 and 2 above);
+      and, if the work is an executable linked with the Library, with the
+      complete machine-readable "work that uses the Library", as object
+      code and/or source code, so that the user can modify the Library and
+      then relink to produce a modified executable containing the modified
+      Library. (It is understood that the user who changes the contents of
+      definitions files in the Library will not necessarily be able to
+      recompile the application to use the modified definitions.)
+
+   b) Use a suitable shared library mechanism for linking with the
+      Library. A suitable mechanism is one that (1) uses at run time a copy
+      of the library already present on the user's computer system, rather
+      than copying library functions into the executable, and (2) will
+      operate properly with a modified version of the library, if the user
+      installs one, as long as the modified version is interface-compatible
+      with the version that the work was made with.
+
+   c) Accompany the work with a written offer, valid for at least three
+      years, to give the same user the materials specified in Subsection
+      6a, above, for a charge no more than the cost of performing this
+      distribution.
+
+   d) If distribution of the work is made by offering access to copy from a
+      designated place, offer equivalent access to copy the above specified
+      materials from the same place.
+
+   e) Verify that the user has already received a copy of these materials
+      or that you have already sent this user a copy.
+
+   For an executable, the required form of the "work that uses the Library"
+   must include any data and utility programs needed for reproducing the
+   executable from it. However, as a special exception, the materials to be
+   distributed need not include anything that is normally distributed (in
+   either source or binary form) with the major components (compiler,
+   kernel, and so on) of the operating system on which the executable runs,
+   unless that component itself accompanies the executable.
+
+   It may happen that this requirement contradicts the license restrictions
+   of other proprietary libraries that do not normally accompany the
+   operating system. Such a contradiction means you cannot use both them
+   and the Library together in an executable that you distribute.
+
+7. You may place library facilities that are a work based on the Library
+   side-by-side in a single library together with other library facilities
+   not covered by this License, and distribute such a combined library,
+   provided that the separate distribution of the work based on the Library
+   and of the other library facilities is otherwise permitted, and provided
+   that you do these two things:
+
+   a) Accompany the combined library with a copy of the same work based on
+      the Library, uncombined with any other library facilities. This must
+      be distributed under the terms of the Sections above.
+
+   b) Give prominent notice with the combined library of the fact that part
+      of it is a work based on the Library, and explaining where to find
+      the accompanying uncombined form of the same work.
+
+8. You may not copy, modify, sublicense, link with, or distribute the
+   Library except as expressly provided under this License. Any attempt
+   otherwise to copy, modify, sublicense, link with, or distribute the
+   Library is void, and will automatically terminate your rights under this
+   License. However, parties who have received copies, or rights, from you
+   under this License will not have their licenses terminated so long as
+   such parties remain in full compliance.
+
+9. You are not required to accept this License, since you have not signed
+   it. However, nothing else grants you permission to modify or distribute
+   the Library or its derivative works. These actions are prohibited by law
+   if you do not accept this License. Therefore, by modifying or
+   distributing the Library (or any work based on the Library), you
+   indicate your acceptance of this License to do so, and all its terms and
+   conditions for copying, distributing or modifying the Library or works
+   based on it.
+
+10. Each time you redistribute the Library (or any work based on the
+    Library), the recipient automatically receives a license from the
+    original licensor to copy, distribute, link with or modify the Library
+    subject to these terms and conditions. You may not impose any further
+    restrictions on the recipients' exercise of the rights granted
+    herein. You are not responsible for enforcing compliance by third
+    parties with this License.
+
+11. If, as a consequence of a court judgment or allegation of patent
+    infringement or for any other reason (not limited to patent issues),
+    conditions are imposed on you (whether by court order, agreement or
+    otherwise) that contradict the conditions of this License, they do not
+    excuse you from the conditions of this License. If you cannot
+    distribute so as to satisfy simultaneously your obligations under this
+    License and any other pertinent obligations, then as a consequence you
+    may not distribute the Library at all. For example, if a patent license
+    would not permit royalty-free redistribution of the Library by all
+    those who receive copies directly or indirectly through you, then the
+    only way you could satisfy both it and this License would be to refrain
+    entirely from distribution of the Library.
+
+    If any portion of this section is held invalid or unenforceable under
+    any particular circumstance, the balance of the section is intended to
+    apply, and the section as a whole is intended to apply in other
+    circumstances.
+
+    It is not the purpose of this section to induce you to infringe any
+    patents or other property right claims or to contest validity of any
+    such claims; this section has the sole purpose of protecting the
+    integrity of the free software distribution system which is implemented
+    by public license practices. Many people have made generous
+    contributions to the wide range of software distributed through that
+    system in reliance on consistent application of that system; it is up
+    to the author/donor to decide if he or she is willing to distribute
+    software through any other system and a licensee cannot impose that
+    choice.
+
+    This section is intended to make thoroughly clear what is believed to
+    be a consequence of the rest of this License.
+
+12. If the distribution and/or use of the Library is restricted in certain
+    countries either by patents or by copyrighted interfaces, the original
+    copyright holder who places the Library under this License may add an
+    explicit geographical distribution limitation excluding those
+    countries, so that distribution is permitted only in or among countries
+    not thus excluded. In such case, this License incorporates the
+    limitation as if written in the body of this License.
+
+13. The Free Software Foundation may publish revised and/or new versions of
+    the Lesser General Public License from time to time. Such new versions
+    will be similar in spirit to the present version, but may differ in
+    detail to address new problems or concerns.
+
+    Each version is given a distinguishing version number. If the Library
+    specifies a version number of this License which applies to it and "any
+    later version", you have the option of following the terms and
+    conditions either of that version or of any later version published by
+    the Free Software Foundation. If the Library does not specify a license
+    version number, you may choose any version ever published by the Free
+    Software Foundation.
+
+14. If you wish to incorporate parts of the Library into other free
+    programs whose distribution conditions are incompatible with these,
+    write to the author to ask for permission. For software which is
+    copyrighted by the Free Software Foundation, write to the Free Software
+    Foundation; we sometimes make exceptions for this. Our decision will be
+    guided by the two goals of preserving the free status of all
+    derivatives of our free software and of promoting the sharing and reuse
+    of software generally.
+
+NO WARRANTY
+
+15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+    FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
+    OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+    PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
+    EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
+    ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE LIBRARY IS WITH
+    YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
+    NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+    WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+    REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU FOR
+    DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL
+    DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE LIBRARY
+    (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED
+    INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF
+    THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF SUCH HOLDER OR
+    OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+
+END OF TERMS AND CONDITIONS
+
+How to Apply These Terms to Your New Libraries
+
+If you develop a new library, and you want it to be of the greatest
+possible use to the public, we recommend making it free software that
+everyone can redistribute and change. You can do so by permitting
+redistribution under these terms (or, alternatively, under the terms of the
+ordinary General Public License).
+
+To apply these terms, attach the following notices to the library. It is
+safest to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least the
+"copyright" line and a pointer to where the full notice is found.
+
+one line to give the library's name and an idea of what it does.
+Copyright (C) year name of author
+
+This library is free software; you can redistribute it and/or modify it
+under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or (at
+your option) any later version.
+
+This library is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this library; if not, write to the Free Software Foundation,
+Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA Also add
+information on how to contact you by electronic and paper mail.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the library, if
+necessary. Here is a sample; alter the names:
+
+Yoyodyne, Inc., hereby disclaims all copyright interest in
+the library `Frob' (a library for tweaking knobs) written
+by James Random Hacker.
+
+signature of Ty Coon, 1 April 1990
+Ty Coon, President of Vice
+That's all there is to it!
diff --git a/LICENSES/GPL-2.0 b/LICENSES/GPL-2.0
new file mode 100644
index 0000000..ff0812f
--- /dev/null
+++ b/LICENSES/GPL-2.0
@@ -0,0 +1,359 @@
+Valid-License-Identifier: GPL-2.0
+Valid-License-Identifier: GPL-2.0-only
+Valid-License-Identifier: GPL-2.0+
+Valid-License-Identifier: GPL-2.0-or-later
+SPDX-URL: https://spdx.org/licenses/GPL-2.0.html
+Usage-Guide:
+  To use this license in source code, put one of the following SPDX
+  tag/value pairs into a comment according to the placement
+  guidelines in the licensing rules documentation.
+  For 'GNU General Public License (GPL) version 2 only' use:
+    SPDX-License-Identifier: GPL-2.0
+  or
+    SPDX-License-Identifier: GPL-2.0-only
+  For 'GNU General Public License (GPL) version 2 or any later version' use:
+    SPDX-License-Identifier: GPL-2.0+
+  or
+    SPDX-License-Identifier: GPL-2.0-or-later
+License-Text:
+
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+                       51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+			    Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+  Finally, any free program is threatened constantly by software
+patents.  We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary.  To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+		    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language.  (Hereinafter, translation is included without limitation in
+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+  2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+    a) You must cause the modified files to carry prominent notices
+    stating that you changed the files and the date of any change.
+
+    b) You must cause any work that you distribute or publish, that in
+    whole or in part contains or is derived from the Program or any
+    part thereof, to be licensed as a whole at no charge to all third
+    parties under the terms of this License.
+
+    c) If the modified program normally reads commands interactively
+    when run, you must cause it, when started running for such
+    interactive use in the most ordinary way, to print or display an
+    announcement including an appropriate copyright notice and a
+    notice that there is no warranty (or else, saying that you provide
+    a warranty) and that users may redistribute the program under
+    these conditions, and telling the user how to view a copy of this
+    License.  (Exception: if the Program itself is interactive but
+    does not normally print such an announcement, your work based on
+    the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works.  But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+  3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+    a) Accompany it with the complete corresponding machine-readable
+    source code, which must be distributed under the terms of Sections
+    1 and 2 above on a medium customarily used for software interchange; or,
+
+    b) Accompany it with a written offer, valid for at least three
+    years, to give any third party, for a charge no more than your
+    cost of physically performing source distribution, a complete
+    machine-readable copy of the corresponding source code, to be
+    distributed under the terms of Sections 1 and 2 above on a medium
+    customarily used for software interchange; or,
+
+    c) Accompany it with the information you received as to the offer
+    to distribute corresponding source code.  (This alternative is
+    allowed only for noncommercial distribution and only if you
+    received the program in object code or executable form with such
+    an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it.  For an executable work, complete source
+code means all the source code for all modules it contains, plus any
+associated interface definition files, plus the scripts used to
+control compilation and installation of the executable.  However, as a
+special exception, the source code distributed need not include
+anything that is normally distributed (in either source or binary
+form) with the major components (compiler, kernel, and so on) of the
+operating system on which the executable runs, unless that component
+itself accompanies the executable.
+
+If distribution of executable or object code is made by offering
+access to copy from a designated place, then offering equivalent
+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+  4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License.  Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+  5. You are not required to accept this License, since you have not
+signed it.  However, nothing else grants you permission to modify or
+distribute the Program or its derivative works.  These actions are
+prohibited by law if you do not accept this License.  Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+  6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions.  You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+  7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all.  For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices.  Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+			    NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+		     END OF TERMS AND CONDITIONS
+
+	    How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Library General
+Public License instead of this License.
diff --git a/LICENSES/LGPL-2.1 b/LICENSES/LGPL-2.1
new file mode 100644
index 0000000..27bb434
--- /dev/null
+++ b/LICENSES/LGPL-2.1
@@ -0,0 +1,503 @@
+Valid-License-Identifier: LGPL-2.1
+Valid-License-Identifier: LGPL-2.1+
+SPDX-URL: https://spdx.org/licenses/LGPL-2.1.html
+Usage-Guide:
+  To use this license in source code, put one of the following SPDX
+  tag/value pairs into a comment according to the placement
+  guidelines in the licensing rules documentation.
+  For 'GNU Lesser General Public License (LGPL) version 2.1 only' use:
+    SPDX-License-Identifier: LGPL-2.1
+  For 'GNU Lesser General Public License (LGPL) version 2.1 or any later
+  version' use:
+    SPDX-License-Identifier: LGPL-2.1+
+License-Text:
+
+GNU LESSER GENERAL PUBLIC LICENSE
+Version 2.1, February 1999
+
+Copyright (C) 1991, 1999 Free Software Foundation, Inc.
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+[This is the first released version of the Lesser GPL. It also counts as
+the successor of the GNU Library Public License, version 2, hence the
+version number 2.1.]
+
+Preamble
+
+The licenses for most software are designed to take away your freedom to
+share and change it. By contrast, the GNU General Public Licenses are
+intended to guarantee your freedom to share and change free software--to
+make sure the software is free for all its users.
+
+This license, the Lesser General Public License, applies to some specially
+designated software packages--typically libraries--of the Free Software
+Foundation and other authors who decide to use it. You can use it too, but
+we suggest you first think carefully about whether this license or the
+ordinary General Public License is the better strategy to use in any
+particular case, based on the explanations below.
+
+When we speak of free software, we are referring to freedom of use, not
+price. Our General Public Licenses are designed to make sure that you have
+the freedom to distribute copies of free software (and charge for this
+service if you wish); that you receive source code or can get it if you
+want it; that you can change the software and use pieces of it in new free
+programs; and that you are informed that you can do these things.
+
+To protect your rights, we need to make restrictions that forbid
+distributors to deny you these rights or to ask you to surrender these
+rights. These restrictions translate to certain responsibilities for you if
+you distribute copies of the library or if you modify it.
+
+For example, if you distribute copies of the library, whether gratis or for
+a fee, you must give the recipients all the rights that we gave you. You
+must make sure that they, too, receive or can get the source code. If you
+link other code with the library, you must provide complete object files to
+the recipients, so that they can relink them with the library after making
+changes to the library and recompiling it. And you must show them these
+terms so they know their rights.
+
+We protect your rights with a two-step method: (1) we copyright the
+library, and (2) we offer you this license, which gives you legal
+permission to copy, distribute and/or modify the library.
+
+To protect each distributor, we want to make it very clear that there is no
+warranty for the free library. Also, if the library is modified by someone
+else and passed on, the recipients should know that what they have is not
+the original version, so that the original author's reputation will not be
+affected by problems that might be introduced by others.
+
+Finally, software patents pose a constant threat to the existence of any
+free program. We wish to make sure that a company cannot effectively
+restrict the users of a free program by obtaining a restrictive license
+from a patent holder. Therefore, we insist that any patent license obtained
+for a version of the library must be consistent with the full freedom of
+use specified in this license.
+
+Most GNU software, including some libraries, is covered by the ordinary GNU
+General Public License. This license, the GNU Lesser General Public
+License, applies to certain designated libraries, and is quite different
+from the ordinary General Public License. We use this license for certain
+libraries in order to permit linking those libraries into non-free
+programs.
+
+When a program is linked with a library, whether statically or using a
+shared library, the combination of the two is legally speaking a combined
+work, a derivative of the original library. The ordinary General Public
+License therefore permits such linking only if the entire combination fits
+its criteria of freedom. The Lesser General Public License permits more lax
+criteria for linking other code with the library.
+
+We call this license the "Lesser" General Public License because it does
+Less to protect the user's freedom than the ordinary General Public
+License. It also provides other free software developers Less of an
+advantage over competing non-free programs. These disadvantages are the
+reason we use the ordinary General Public License for many
+libraries. However, the Lesser license provides advantages in certain
+special circumstances.
+
+For example, on rare occasions, there may be a special need to encourage
+the widest possible use of a certain library, so that it becomes a de-facto
+standard. To achieve this, non-free programs must be allowed to use the
+library. A more frequent case is that a free library does the same job as
+widely used non-free libraries. In this case, there is little to gain by
+limiting the free library to free software only, so we use the Lesser
+General Public License.
+
+In other cases, permission to use a particular library in non-free programs
+enables a greater number of people to use a large body of free
+software. For example, permission to use the GNU C Library in non-free
+programs enables many more people to use the whole GNU operating system, as
+well as its variant, the GNU/Linux operating system.
+
+Although the Lesser General Public License is Less protective of the users'
+freedom, it does ensure that the user of a program that is linked with the
+Library has the freedom and the wherewithal to run that program using a
+modified version of the Library.
+
+The precise terms and conditions for copying, distribution and modification
+follow. Pay close attention to the difference between a "work based on the
+library" and a "work that uses the library". The former contains code
+derived from the library, whereas the latter must be combined with the
+library in order to run.
+
+TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+0. This License Agreement applies to any software library or other program
+   which contains a notice placed by the copyright holder or other
+   authorized party saying it may be distributed under the terms of this
+   Lesser General Public License (also called "this License"). Each
+   licensee is addressed as "you".
+
+   A "library" means a collection of software functions and/or data
+   prepared so as to be conveniently linked with application programs
+   (which use some of those functions and data) to form executables.
+
+   The "Library", below, refers to any such software library or work which
+   has been distributed under these terms. A "work based on the Library"
+   means either the Library or any derivative work under copyright law:
+   that is to say, a work containing the Library or a portion of it, either
+   verbatim or with modifications and/or translated straightforwardly into
+   another language. (Hereinafter, translation is included without
+   limitation in the term "modification".)
+
+   "Source code" for a work means the preferred form of the work for making
+   modifications to it. For a library, complete source code means all the
+   source code for all modules it contains, plus any associated interface
+   definition files, plus the scripts used to control compilation and
+   installation of the library.
+
+    Activities other than copying, distribution and modification are not
+    covered by this License; they are outside its scope. The act of running
+    a program using the Library is not restricted, and output from such a
+    program is covered only if its contents constitute a work based on the
+    Library (independent of the use of the Library in a tool for writing
+    it). Whether that is true depends on what the Library does and what the
+    program that uses the Library does.
+
+1. You may copy and distribute verbatim copies of the Library's complete
+   source code as you receive it, in any medium, provided that you
+   conspicuously and appropriately publish on each copy an appropriate
+   copyright notice and disclaimer of warranty; keep intact all the notices
+   that refer to this License and to the absence of any warranty; and
+   distribute a copy of this License along with the Library.
+
+   You may charge a fee for the physical act of transferring a copy, and
+   you may at your option offer warranty protection in exchange for a fee.
+
+2. You may modify your copy or copies of the Library or any portion of it,
+   thus forming a work based on the Library, and copy and distribute such
+   modifications or work under the terms of Section 1 above, provided that
+   you also meet all of these conditions:
+
+   a) The modified work must itself be a software library.
+
+   b) You must cause the files modified to carry prominent notices stating
+      that you changed the files and the date of any change.
+
+   c) You must cause the whole of the work to be licensed at no charge to
+      all third parties under the terms of this License.
+
+   d) If a facility in the modified Library refers to a function or a table
+      of data to be supplied by an application program that uses the
+      facility, other than as an argument passed when the facility is
+      invoked, then you must make a good faith effort to ensure that, in
+      the event an application does not supply such function or table, the
+      facility still operates, and performs whatever part of its purpose
+      remains meaningful.
+
+   (For example, a function in a library to compute square roots has a
+    purpose that is entirely well-defined independent of the
+    application. Therefore, Subsection 2d requires that any
+    application-supplied function or table used by this function must be
+    optional: if the application does not supply it, the square root
+    function must still compute square roots.)
+
+   These requirements apply to the modified work as a whole. If
+   identifiable sections of that work are not derived from the Library, and
+   can be reasonably considered independent and separate works in
+   themselves, then this License, and its terms, do not apply to those
+   sections when you distribute them as separate works. But when you
+   distribute the same sections as part of a whole which is a work based on
+   the Library, the distribution of the whole must be on the terms of this
+   License, whose permissions for other licensees extend to the entire
+   whole, and thus to each and every part regardless of who wrote it.
+
+   Thus, it is not the intent of this section to claim rights or contest
+   your rights to work written entirely by you; rather, the intent is to
+   exercise the right to control the distribution of derivative or
+   collective works based on the Library.
+
+   In addition, mere aggregation of another work not based on the Library
+   with the Library (or with a work based on the Library) on a volume of a
+   storage or distribution medium does not bring the other work under the
+   scope of this License.
+
+3. You may opt to apply the terms of the ordinary GNU General Public
+   License instead of this License to a given copy of the Library. To do
+   this, you must alter all the notices that refer to this License, so that
+   they refer to the ordinary GNU General Public License, version 2,
+   instead of to this License. (If a newer version than version 2 of the
+   ordinary GNU General Public License has appeared, then you can specify
+   that version instead if you wish.) Do not make any other change in these
+   notices.
+
+   Once this change is made in a given copy, it is irreversible for that
+   copy, so the ordinary GNU General Public License applies to all
+   subsequent copies and derivative works made from that copy.
+
+   This option is useful when you wish to copy part of the code of the
+   Library into a program that is not a library.
+
+4. You may copy and distribute the Library (or a portion or derivative of
+   it, under Section 2) in object code or executable form under the terms
+   of Sections 1 and 2 above provided that you accompany it with the
+   complete corresponding machine-readable source code, which must be
+   distributed under the terms of Sections 1 and 2 above on a medium
+   customarily used for software interchange.
+
+   If distribution of object code is made by offering access to copy from a
+   designated place, then offering equivalent access to copy the source
+   code from the same place satisfies the requirement to distribute the
+   source code, even though third parties are not compelled to copy the
+   source along with the object code.
+
+5. A program that contains no derivative of any portion of the Library, but
+   is designed to work with the Library by being compiled or linked with
+   it, is called a "work that uses the Library". Such a work, in isolation,
+   is not a derivative work of the Library, and therefore falls outside the
+   scope of this License.
+
+   However, linking a "work that uses the Library" with the Library creates
+   an executable that is a derivative of the Library (because it contains
+   portions of the Library), rather than a "work that uses the
+   library". The executable is therefore covered by this License. Section 6
+   states terms for distribution of such executables.
+
+   When a "work that uses the Library" uses material from a header file
+   that is part of the Library, the object code for the work may be a
+   derivative work of the Library even though the source code is
+   not. Whether this is true is especially significant if the work can be
+   linked without the Library, or if the work is itself a library. The
+   threshold for this to be true is not precisely defined by law.
+
+   If such an object file uses only numerical parameters, data structure
+   layouts and accessors, and small macros and small inline functions (ten
+   lines or less in length), then the use of the object file is
+   unrestricted, regardless of whether it is legally a derivative
+   work. (Executables containing this object code plus portions of the
+   Library will still fall under Section 6.)
+
+   Otherwise, if the work is a derivative of the Library, you may
+   distribute the object code for the work under the terms of Section
+   6. Any executables containing that work also fall under Section 6,
+   whether or not they are linked directly with the Library itself.
+
+6. As an exception to the Sections above, you may also combine or link a
+   "work that uses the Library" with the Library to produce a work
+   containing portions of the Library, and distribute that work under terms
+   of your choice, provided that the terms permit modification of the work
+   for the customer's own use and reverse engineering for debugging such
+   modifications.
+
+   You must give prominent notice with each copy of the work that the
+   Library is used in it and that the Library and its use are covered by
+   this License. You must supply a copy of this License. If the work during
+   execution displays copyright notices, you must include the copyright
+   notice for the Library among them, as well as a reference directing the
+   user to the copy of this License. Also, you must do one of these things:
+
+   a) Accompany the work with the complete corresponding machine-readable
+      source code for the Library including whatever changes were used in
+      the work (which must be distributed under Sections 1 and 2 above);
+      and, if the work is an executable linked with the Library, with the
+      complete machine-readable "work that uses the Library", as object
+      code and/or source code, so that the user can modify the Library and
+      then relink to produce a modified executable containing the modified
+      Library. (It is understood that the user who changes the contents of
+      definitions files in the Library will not necessarily be able to
+      recompile the application to use the modified definitions.)
+
+   b) Use a suitable shared library mechanism for linking with the
+      Library. A suitable mechanism is one that (1) uses at run time a copy
+      of the library already present on the user's computer system, rather
+      than copying library functions into the executable, and (2) will
+      operate properly with a modified version of the library, if the user
+      installs one, as long as the modified version is interface-compatible
+      with the version that the work was made with.
+
+   c) Accompany the work with a written offer, valid for at least three
+      years, to give the same user the materials specified in Subsection
+      6a, above, for a charge no more than the cost of performing this
+      distribution.
+
+   d) If distribution of the work is made by offering access to copy from a
+      designated place, offer equivalent access to copy the above specified
+      materials from the same place.
+
+   e) Verify that the user has already received a copy of these materials
+      or that you have already sent this user a copy.
+
+   For an executable, the required form of the "work that uses the Library"
+   must include any data and utility programs needed for reproducing the
+   executable from it. However, as a special exception, the materials to be
+   distributed need not include anything that is normally distributed (in
+   either source or binary form) with the major components (compiler,
+   kernel, and so on) of the operating system on which the executable runs,
+   unless that component itself accompanies the executable.
+
+   It may happen that this requirement contradicts the license restrictions
+   of other proprietary libraries that do not normally accompany the
+   operating system. Such a contradiction means you cannot use both them
+   and the Library together in an executable that you distribute.
+
+7. You may place library facilities that are a work based on the Library
+   side-by-side in a single library together with other library facilities
+   not covered by this License, and distribute such a combined library,
+   provided that the separate distribution of the work based on the Library
+   and of the other library facilities is otherwise permitted, and provided
+   that you do these two things:
+
+   a) Accompany the combined library with a copy of the same work based on
+      the Library, uncombined with any other library facilities. This must
+      be distributed under the terms of the Sections above.
+
+   b) Give prominent notice with the combined library of the fact that part
+      of it is a work based on the Library, and explaining where to find
+      the accompanying uncombined form of the same work.
+
+8. You may not copy, modify, sublicense, link with, or distribute the
+   Library except as expressly provided under this License. Any attempt
+   otherwise to copy, modify, sublicense, link with, or distribute the
+   Library is void, and will automatically terminate your rights under this
+   License. However, parties who have received copies, or rights, from you
+   under this License will not have their licenses terminated so long as
+   such parties remain in full compliance.
+
+9. You are not required to accept this License, since you have not signed
+   it. However, nothing else grants you permission to modify or distribute
+   the Library or its derivative works. These actions are prohibited by law
+   if you do not accept this License. Therefore, by modifying or
+   distributing the Library (or any work based on the Library), you
+   indicate your acceptance of this License to do so, and all its terms and
+   conditions for copying, distributing or modifying the Library or works
+   based on it.
+
+10. Each time you redistribute the Library (or any work based on the
+    Library), the recipient automatically receives a license from the
+    original licensor to copy, distribute, link with or modify the Library
+    subject to these terms and conditions. You may not impose any further
+    restrictions on the recipients' exercise of the rights granted
+    herein. You are not responsible for enforcing compliance by third
+    parties with this License.
+
+11. If, as a consequence of a court judgment or allegation of patent
+    infringement or for any other reason (not limited to patent issues),
+    conditions are imposed on you (whether by court order, agreement or
+    otherwise) that contradict the conditions of this License, they do not
+    excuse you from the conditions of this License. If you cannot
+    distribute so as to satisfy simultaneously your obligations under this
+    License and any other pertinent obligations, then as a consequence you
+    may not distribute the Library at all. For example, if a patent license
+    would not permit royalty-free redistribution of the Library by all
+    those who receive copies directly or indirectly through you, then the
+    only way you could satisfy both it and this License would be to refrain
+    entirely from distribution of the Library.
+
+    If any portion of this section is held invalid or unenforceable under
+    any particular circumstance, the balance of the section is intended to
+    apply, and the section as a whole is intended to apply in other
+    circumstances.
+
+    It is not the purpose of this section to induce you to infringe any
+    patents or other property right claims or to contest validity of any
+    such claims; this section has the sole purpose of protecting the
+    integrity of the free software distribution system which is implemented
+    by public license practices. Many people have made generous
+    contributions to the wide range of software distributed through that
+    system in reliance on consistent application of that system; it is up
+    to the author/donor to decide if he or she is willing to distribute
+    software through any other system and a licensee cannot impose that
+    choice.
+
+    This section is intended to make thoroughly clear what is believed to
+    be a consequence of the rest of this License.
+
+12. If the distribution and/or use of the Library is restricted in certain
+    countries either by patents or by copyrighted interfaces, the original
+    copyright holder who places the Library under this License may add an
+    explicit geographical distribution limitation excluding those
+    countries, so that distribution is permitted only in or among countries
+    not thus excluded. In such case, this License incorporates the
+    limitation as if written in the body of this License.
+
+13. The Free Software Foundation may publish revised and/or new versions of
+    the Lesser General Public License from time to time. Such new versions
+    will be similar in spirit to the present version, but may differ in
+    detail to address new problems or concerns.
+
+    Each version is given a distinguishing version number. If the Library
+    specifies a version number of this License which applies to it and "any
+    later version", you have the option of following the terms and
+    conditions either of that version or of any later version published by
+    the Free Software Foundation. If the Library does not specify a license
+    version number, you may choose any version ever published by the Free
+    Software Foundation.
+
+14. If you wish to incorporate parts of the Library into other free
+    programs whose distribution conditions are incompatible with these,
+    write to the author to ask for permission. For software which is
+    copyrighted by the Free Software Foundation, write to the Free Software
+    Foundation; we sometimes make exceptions for this. Our decision will be
+    guided by the two goals of preserving the free status of all
+    derivatives of our free software and of promoting the sharing and reuse
+    of software generally.
+
+NO WARRANTY
+
+15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+    FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
+    OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+    PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
+    EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
+    ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE LIBRARY IS WITH
+    YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
+    NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+    WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+    REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU FOR
+    DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL
+    DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE LIBRARY
+    (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED
+    INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF
+    THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF SUCH HOLDER OR
+    OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+
+END OF TERMS AND CONDITIONS
+
+How to Apply These Terms to Your New Libraries
+
+If you develop a new library, and you want it to be of the greatest
+possible use to the public, we recommend making it free software that
+everyone can redistribute and change. You can do so by permitting
+redistribution under these terms (or, alternatively, under the terms of the
+ordinary General Public License).
+
+To apply these terms, attach the following notices to the library. It is
+safest to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least the
+"copyright" line and a pointer to where the full notice is found.
+
+one line to give the library's name and an idea of what it does.
+Copyright (C) year name of author
+
+This library is free software; you can redistribute it and/or modify it
+under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or (at
+your option) any later version.
+
+This library is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this library; if not, write to the Free Software Foundation,
+Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA Also add
+information on how to contact you by electronic and paper mail.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the library, if
+necessary. Here is a sample; alter the names:
+
+Yoyodyne, Inc., hereby disclaims all copyright interest in
+the library `Frob' (a library for tweaking knobs) written
+by James Random Hacker.
+
+signature of Ty Coon, 1 April 1990
+Ty Coon, President of Vice
+That's all there is to it!
diff --git a/METADATA b/METADATA
new file mode 100644
index 0000000..764071d
--- /dev/null
+++ b/METADATA
@@ -0,0 +1,19 @@
+# This project was upgraded with external_updater.
+# Usage: tools/external_updater/updater.sh update libtraceevent
+# For more info, check https://cs.android.com/android/platform/superproject/+/master:tools/external_updater/README.md
+
+name: "libtraceevent"
+description: "libtraceevent is a library that provides APIs to access and configure kernel trace events through the tracefs filesystem."
+third_party {
+  url {
+    type: GIT
+    value: "https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git"
+  }
+  version: "libtraceevent-1.7.1"
+  license_type: RESTRICTED
+  last_upgrade_date {
+    year: 2023
+    month: 1
+    day: 18
+  }
+}
diff --git a/MODULE_LICENSE_GPL b/MODULE_LICENSE_GPL
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/MODULE_LICENSE_GPL
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..20d90be
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,443 @@
+# SPDX-License-Identifier: GPL-2.0
+# libtraceevent version
+EP_VERSION = 1
+EP_PATCHLEVEL = 7
+EP_EXTRAVERSION = 1
+EVENT_PARSE_VERSION = $(EP_VERSION).$(EP_PATCHLEVEL).$(EP_EXTRAVERSION)
+
+MAKEFLAGS += --no-print-directory
+
+
+# Makefiles suck: This macro sets a default value of $(2) for the
+# variable named by $(1), unless the variable has been set by
+# environment or command line. This is necessary for CC and AR
+# because make sets default values, so the simpler ?= approach
+# won't work as expected.
+define allow-override
+  $(if $(or $(findstring environment,$(origin $(1))),\
+            $(findstring command line,$(origin $(1)))),,\
+    $(eval $(1) = $(2)))
+endef
+
+# Allow setting CC and AR, or setting CROSS_COMPILE as a prefix.
+$(call allow-override,CC,$(CROSS_COMPILE)gcc)
+$(call allow-override,AR,$(CROSS_COMPILE)ar)
+$(call allow-override,NM,$(CROSS_COMPILE)nm)
+$(call allow-override,PKG_CONFIG,pkg-config)
+$(call allow-override,LD_SO_CONF_PATH,/etc/ld.so.conf.d/)
+$(call allow-override,LDCONFIG,ldconfig)
+
+EXT = -std=gnu99
+INSTALL = install
+
+# Use DESTDIR for installing into a different root directory.
+# This is useful for building a package. The program will be
+# installed in this directory as if it was the root directory.
+# Then the build tool can move it later.
+DESTDIR ?=
+DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
+
+LP64 := $(shell echo __LP64__ | ${CC} ${CFLAGS} -E -x c - | tail -n 1)
+ifeq ($(LP64), 1)
+  libdir_relative_temp = lib64
+else
+  libdir_relative_temp = lib
+endif
+
+libdir_relative ?= $(libdir_relative_temp)
+prefix ?= /usr/local
+libdir ?= $(prefix)/$(libdir_relative)
+man_dir ?= $(prefix)/share/man
+man_dir_SQ = '$(subst ','\'',$(man_dir))'
+pkgconfig_dir ?= $(word 1,$(shell $(PKG_CONFIG) 		\
+			--variable pc_path pkg-config | tr ":" " "))
+includedir_relative = include/traceevent
+includedir = $(prefix)/$(includedir_relative)
+includedir_SQ = '$(subst ','\'',$(includedir))'
+
+export man_dir man_dir_SQ INSTALL
+export DESTDIR DESTDIR_SQ
+export EP_VERSION EVENT_PARSE_VERSION
+
+# copy a bit from Linux kbuild
+
+ifeq ("$(origin V)", "command line")
+  VERBOSE = $(V)
+endif
+ifndef VERBOSE
+  VERBOSE = 0
+endif
+
+SILENT := $(if $(findstring s,$(filter-out --%,$(MAKEFLAGS))),1)
+
+ifeq ("$(origin O)", "command line")
+
+  saved-output := $(O)
+  BUILD_OUTPUT := $(shell cd $(O) && /bin/pwd)
+  $(if $(BUILD_OUTPUT),, \
+    $(error output directory "$(saved-output)" does not exist))
+
+else
+  BUILD_OUTPUT = $(CURDIR)
+endif
+
+srctree		:= $(if $(BUILD_SRC),$(BUILD_SRC),$(CURDIR))
+objtree		:= $(BUILD_OUTPUT)
+src		:= $(srctree)
+obj		:= $(objtree)
+bdir		:= $(obj)/lib
+
+export prefix src obj bdir
+
+PKG_CONFIG_SOURCE_FILE = libtraceevent.pc
+PKG_CONFIG_FILE := $(addprefix $(obj)/,$(PKG_CONFIG_SOURCE_FILE))
+
+export Q SILENT VERBOSE EXT
+
+# Include the utils
+include scripts/utils.mk
+
+include $(src)/scripts/features.mk
+
+# Shell quotes
+libdir_SQ = $(subst ','\'',$(libdir))
+libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
+
+CONFIG_INCLUDES = 
+CONFIG_LIBS	=
+CONFIG_FLAGS	=
+
+VERSION		= $(EP_VERSION)
+PATCHLEVEL	= $(EP_PATCHLEVEL)
+EXTRAVERSION	= $(EP_EXTRAVERSION)
+
+OBJ		= $@
+N		=
+
+LIBTRACEEVENT_STATIC = $(bdir)/libtraceevent.a
+LIBTRACEEVENT_SHARED = $(bdir)/libtraceevent.so.$(EVENT_PARSE_VERSION)
+
+EP_HEADERS_DIR = $(src)/include/traceevent
+
+INCLUDES = -I. -I $(srctree)/include -I $(EP_HEADERS_DIR) $(CONFIG_INCLUDES)
+
+export LIBTRACEEVENT_STATIC LIBTRACEEVENT_SHARED EP_HEADERS_DIR
+
+# Set compile option CFLAGS
+ifdef EXTRA_CFLAGS
+  CFLAGS := $(EXTRA_CFLAGS)
+else
+  CFLAGS := -g -Wall
+endif
+
+LIBS ?= -ldl
+export LIBS
+
+set_plugin_dir := 1
+
+# Set plugin_dir to prefered global plugin location
+# If we install under $HOME directory we go under
+# $(HOME)/.local/lib/traceevent/plugins
+#
+# We dont set PLUGIN_DIR in case we install under $HOME
+# directory, because by default the code looks under:
+# $(HOME)/.local/lib/traceevent/plugins by default.
+#
+ifeq ($(plugin_dir),)
+ifeq ($(prefix),$(HOME))
+override plugin_dir = $(HOME)/.local/lib/traceevent/plugins
+set_plugin_dir := 0
+else
+override plugin_dir = $(libdir)/traceevent/plugins
+endif
+export plugin_dir
+endif
+
+ifeq ($(set_plugin_dir),1)
+PLUGIN_DIR = -DPLUGIN_DIR="$(plugin_dir)"
+PLUGIN_DIR_SQ = '$(subst ','\'',$(PLUGIN_DIR))'
+export PLUGIN_DIR PLUGIN_DIR_SQ
+endif
+
+# Append required CFLAGS
+override CFLAGS += -fPIC
+override CFLAGS += $(CONFIG_FLAGS) $(INCLUDES) $(PLUGIN_DIR_SQ)
+override CFLAGS += $(udis86-flags) -D_GNU_SOURCE
+
+# Make sure 32 bit stat() works on large file systems
+override CFLAGS += -D_FILE_OFFSET_BITS=64
+
+ifeq ($(VERBOSE),1)
+  Q =
+else
+  Q = @
+endif
+
+# Disable command line variables (CFLAGS) override from top
+# level Makefile (perf), otherwise build Makefile will get
+# the same command line setup.
+MAKEOVERRIDES=
+
+export srctree CC LD CFLAGS V
+build := -f $(srctree)/build/Makefile.build dir=. obj
+
+LIB_TARGET := libtraceevent.so libtraceevent.a
+
+CMD_TARGETS = $(LIB_TARGET) $(PKG_CONFIG_FILE)
+
+TARGETS = $(CMD_TARGETS)
+
+all: all_cmd plugins
+
+$(bdir):
+	$(Q)mkdir -p $(bdir)
+
+LIB_TARGET  = libtraceevent.a libtraceevent.so
+LIB_INSTALL = libtraceevent.a libtraceevent.so*
+LIB_INSTALL := $(addprefix $(bdir)/,$(LIB_INSTALL))
+
+LIBTRACEEVENT_SHARED_SO = $(bdir)/libtraceevent.so
+LIBTRACEEVENT_SHARED_VERSION = $(bdir)/libtraceevent.so.$(EP_VERSION)
+
+export LIBTRACEEVENT_SHARED_SO LIBTRACEEVENT_SHARED_VERSION
+
+all_cmd: $(CMD_TARGETS)
+
+libtraceevent.a: $(bdir) $(LIBTRACEEVENT_STATIC)
+libtraceevent.so: $(bdir) $(LIBTRACEEVENT_SHARED)
+
+libs: libtraceevent.a libtraceevent.so
+
+$(LIBTRACEEVENT_STATIC): force
+	$(Q)$(call descend,$(src)/src,$@)
+
+$(LIBTRACEEVENT_SHARED): force
+	$(Q)$(call descend,$(src)/src,libtraceevent.so)
+
+$(bdir)/libtraceevent.so: $(bdir)/libtraceevent.so.$(EP_VERSION)
+	@ln -sf $(<F) $@
+
+define make_version.h
+  (echo '/* This file is automatically generated. Do not modify. */';		\
+   echo \#define VERSION_CODE $(shell						\
+   expr $(VERSION) \* 256 + $(PATCHLEVEL));					\
+   echo '#define EXTRAVERSION ' $(EXTRAVERSION);				\
+   echo '#define VERSION_STRING "'$(VERSION).$(PATCHLEVEL).$(EXTRAVERSION)'"';	\
+   echo '#define FILE_VERSION '$(FILE_VERSION);					\
+  ) > $1
+endef
+
+define update_version.h
+  ($(call make_version.h, $@.tmp);		\
+    if [ -r $@ ] && cmp -s $@ $@.tmp; then	\
+      rm -f $@.tmp;				\
+    else					\
+      echo '  UPDATE                 $@';	\
+      mv -f $@.tmp $@;				\
+    fi);
+endef
+
+VERSION_FILE = $(obj)/ep_version.h
+
+$(VERSION_FILE): force
+	$(Q)$(N)$(call update_version.h)
+
+define update_dir
+  (echo $1 > $@.tmp;				\
+   if [ -r $@ ] && cmp -s $@ $@.tmp; then	\
+     rm -f $@.tmp;				\
+   else						\
+     echo '  UPDATE                 $@';	\
+     mv -f $@.tmp $@;				\
+   fi);
+endef
+
+UTEST_DIR = utest
+
+test:	force $(LIBTRACEEVENT_STATIC)
+	$(Q)$(call descend,$(UTEST_DIR),test)
+
+VIM_TAGS = $(obj)/tags
+EMACS_TAGS = $(obj)/TAGS
+
+$(VIM_TAGS): force
+	$(RM) $(VIM_TAGS)
+	find $(src) -name '*.[ch]' | (cd $(obj) && xargs ctags --extra=+f --c-kinds=+px \
+	--regex-c++='/_PE\(([^,)]*).*/TEP_ERRNO__\1/')
+
+tags: $(VIM_TAGS)
+
+$(EMACS_TAGS): force
+	$(RM) $(EMACS_TAGS)
+	find $(src) -name '*.[ch]' | (cd $(obj) && xargs etags \
+	--regex='/_PE(\([^,)]*\).*/TEP_ERRNO__\1/')
+
+TAGS: $(EMACS_TAGS)
+
+define build_prefix
+	(echo $1 > $@.tmp;	\
+	if [ -r $@ ] && cmp -s $@ $@.tmp; then				\
+		rm -f $@.tmp;						\
+	else								\
+		$(PRINT_GEN)						\
+		mv -f $@.tmp $@;					\
+	fi);
+endef
+
+BUILD_PREFIX := $(obj)/build_prefix
+
+$(BUILD_PREFIX): force
+	$(Q)$(call build_prefix,$(prefix))
+
+define do_make_pkgconfig_file
+	cp -f ${PKG_CONFIG_SOURCE_FILE}.template ${PKG_CONFIG_FILE};	\
+	sed -i "s|INSTALL_PREFIX|${1}|g" ${PKG_CONFIG_FILE}; 		\
+	sed -i "s|LIB_VERSION|${EVENT_PARSE_VERSION}|g" ${PKG_CONFIG_FILE}; \
+	sed -i "s|LIB_DIR|${libdir_relative}|g" ${PKG_CONFIG_FILE}; \
+	sed -i "s|HEADER_DIR|$(includedir_relative)|g" ${PKG_CONFIG_FILE};
+endef
+
+$(PKG_CONFIG_FILE) : ${PKG_CONFIG_SOURCE_FILE}.template $(BUILD_PREFIX) $(VERSION_FILE)
+	$(Q)$(print_gen)$(call do_make_pkgconfig_file,$(prefix))
+
+define do_install_pkgconfig_file
+	if [ -n "${pkgconfig_dir}" ]; then 					\
+		$(call do_install,$(PKG_CONFIG_FILE),$(pkgconfig_dir),644); 	\
+	else 									\
+		(echo Failed to locate pkg-config directory) 1>&2;		\
+	fi
+endef
+
+
+ifeq ("$(DESTDIR)", "")
+# If DESTDIR is not defined, then test if after installing the library
+# and running ldconfig, if the library is visible by ld.so.
+# If not, add the path to /etc/ld.so.conf.d/trace.conf and run ldconfig again.
+define install_ld_config
+	if $(LDCONFIG); then \
+		if ! grep -q "^$(libdir)$$" $(LD_SO_CONF_PATH)/* ; then \
+			$(CC) -o $(objtree)/test $(srctree)/test.c -I $(includedir_SQ) \
+				-L $(libdir_SQ) -ltraceevent &> /dev/null; \
+			if ! $(objtree)/test &> /dev/null; then \
+				$(call print_install, trace.conf, $(LD_SO_CONF_PATH)) \
+				echo $(libdir_SQ) >> $(LD_SO_CONF_PATH)/trace.conf; \
+				$(LDCONFIG); \
+			fi; \
+			$(RM) $(objtree)/test; \
+		fi; \
+	fi
+endef
+else
+# If installing to a location for another machine or package, do not bother
+# with running ldconfig.
+define install_ld_config
+endef
+endif # DESTDIR = ""
+
+install: install_libs install_plugins
+
+install_libs: libs install_headers install_pkgconfig
+	$(Q)$(call do_install,$(LIBTRACEEVENT_SHARED),$(libdir_SQ)); \
+		cp -fpR $(LIB_INSTALL) $(DESTDIR)$(libdir_SQ)
+	$(Q)$(call install_ld_config)
+
+install_pkgconfig: $(PKG_CONFIG_FILE)
+	$(Q)$(call do_install_pkgconfig_file,$(prefix))
+
+install_headers:
+	$(Q)$(call do_install,$(EP_HEADERS_DIR)/event-parse.h,$(includedir_SQ),644);
+	$(Q)$(call do_install,$(EP_HEADERS_DIR)/event-utils.h,$(includedir_SQ),644);
+	$(Q)$(call do_install,$(EP_HEADERS_DIR)/trace-seq.h,$(includedir_SQ),644);
+	$(Q)$(call do_install,$(EP_HEADERS_DIR)/kbuffer.h,$(includedir_SQ),644)
+
+install: install_libs
+
+clean: clean_plugins clean_src
+	$(Q)$(call do_clean,\
+	    $(VERSION_FILE) $(obj)/tags $(obj)/TAGS $(PKG_CONFIG_FILE) \
+	    $(LIBTRACEEVENT_STATIC) $(LIBTRACEEVENT_SHARED) \
+	    $(LIBTRACEEVENT_SHARED_SO) $(LIBTRACEEVENT_SHARED_VERSION) \
+	    $(BUILD_PREFIX))
+
+define build_uninstall_script
+	$(Q)mkdir $(BUILD_OUTPUT)/tmp_build
+	$(Q)$(MAKE) -C $(srctree) DESTDIR=$(BUILD_OUTPUT)/tmp_build/ O=$(BUILD_OUTPUT) $1 > /dev/null
+	$(Q)find $(BUILD_OUTPUT)/tmp_build ! -type d -printf "%P\n" > $(BUILD_OUTPUT)/build_$2
+	$(Q)$(RM) -rf $(BUILD_OUTPUT)/tmp_build
+endef
+
+build_uninstall: $(BUILD_PREFIX)
+	$(call build_uninstall_script,install,uninstall)
+
+$(BUILD_OUTPUT)/build_uninstall: build_uninstall
+
+define uninstall_file
+	if [ -f $(DESTDIR)/$1 -o -h $(DESTDIR)/$1 ]; then \
+		$(call PRINT_UNINST,$(DESTDIR)$1)$(RM) $(DESTDIR)/$1; \
+	fi;
+endef
+
+uninstall: $(BUILD_OUTPUT)/build_uninstall
+	@$(foreach file,$(shell cat $(BUILD_OUTPUT)/build_uninstall),$(call uninstall_file,$(file)))
+
+PHONY += doc
+doc: check_doc
+	$(Q)$(call descend,$(src)/Documentation,)
+
+PHONY += doc-clean
+doc-clean:
+	$(MAKE) -C $(src)/Documentation clean
+
+PHONY += doc-install
+doc-install:
+	$(Q)$(call descend,$(src)/Documentation,install)
+
+check_doc: force
+	$(Q)$(src)/check-manpages.sh $(src)/Documentation
+
+
+PHONY += doc-uninstall
+doc-uninstall:
+	$(MAKE) -C $(src)/Documentation uninstall
+
+PHONY += help
+help:
+	@echo 'Possible targets:'
+	@echo''
+	@echo '  all                 - default, compile the library and the'\
+				      'plugins'
+	@echo '  plugins             - compile the plugins'
+	@echo '  install             - install the library, the plugins,'\
+					'the header and pkgconfig files'
+	@echo '  clean               - clean the library and the plugins object files'
+	@echo '  doc                 - compile the documentation files - man'\
+					'and html pages, in the Documentation directory'
+	@echo '  doc-clean           - clean the documentation files'
+	@echo '  doc-install         - install the man pages'
+	@echo '  doc-uninstall       - uninstall the man pages'
+	@echo''
+
+PHONY += plugins
+plugins:
+	$(Q)$(call descend,plugins,)
+
+PHONY += install_plugins
+install_plugins: plugins
+	$(Q)$(call descend,plugins,install)
+
+samples: libtraceevent.a force
+	$(Q)$(call descend,$(src)/samples,all)
+
+PHONY += clean_plugins
+clean_plugins:
+	$(Q)$(call descend_clean,plugins)
+
+PHONY += clean_src
+clean_src:
+	$(Q)$(call descend_clean,src)
+
+force:
+
+# Declare the contents of the .PHONY variable as phony.  We keep that
+# information in a variable so we can use it in if_changed and friends.
+.PHONY: $(PHONY)
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..7e72f72
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,2 @@
+kaleshsingh@google.com
+namhyung@google.com
diff --git a/README b/README
new file mode 100644
index 0000000..3bf05ad
--- /dev/null
+++ b/README
@@ -0,0 +1,52 @@
+
+The official repository is here:
+
+  https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
+
+
+To build:
+
+    make;
+    sudo make install;
+
+To build in a specific directory outside of the source directory:
+
+    make O=/path/to/build; sudo make O=/path/to/build
+
+  Note that the path needs to exist before building.
+
+To set the install path (the expected final location):
+
+    make prefix=/usr; sudo make O=/path/to/build
+
+To install in a directory not for the local system (for use to move
+to another machine):
+
+    make DESTDIR=/path/to/dest/ install
+
+  Note, if you have write permission to the DESTDIR, then there is
+  no reason to use sudo or switch to root.
+
+  Note, DESTDIR must end with '/', otherwise the files will be appended
+  to the path, which will most likely have unwanted results.
+
+Contributions:
+
+  For questions about the use of the library, please send email to:
+
+    linux-trace-users@vger.kernel.org
+
+    Subscribe: http://vger.kernel.org/vger-lists.html#linux-trace-users
+    Archives: https://lore.kernel.org/linux-trace-users/
+
+  For contributions to development, please send patches to:
+
+    linux-trace-devel@vger.kernel.org
+
+    Subscribe: http://vger.kernel.org/vger-lists.html#linux-trace-devel
+    Archives: https://lore.kernel.org/linux-trace-devel/
+
+  Note, this project follows the style of submitting patches as described
+  by the Linux kernel.
+
+     https://www.kernel.org/doc/html/v5.4/process/submitting-patches.html
diff --git a/check-manpages.sh b/check-manpages.sh
new file mode 100755
index 0000000..4e9850f
--- /dev/null
+++ b/check-manpages.sh
@@ -0,0 +1,78 @@
+#!/bin/bash
+# SPDX-License-Identifier: LGPL-2.1
+# Copyright (C) 2022, Google Inc, Steven Rostedt <rostedt@goodmis.org>
+#
+# This checks if any function is listed in a man page that is not listed
+# in the main man page.
+
+if [ $# -lt 1 ]; then
+	echo "usage: check-manpages man-page-path"
+	exit 1
+fi
+
+cd $1
+
+MAIN=libtraceevent
+MAIN_FILE=${MAIN}.txt
+
+PROCESSED=""
+
+# Ignore man pages that do not contain functions
+IGNORE=""
+
+for man in ${MAIN}-*.txt; do
+
+	for a in `sed -ne '/^NAME/,/^SYNOP/{/^[a-z]/{s/, *$//;s/,/\n/g;s/ //g;s/-.*$/-/;/-/{s/-//p;q};p}}' $man`; do
+		if [ "${PROCESSED/:${a} /}" != "${PROCESSED}" ]; then
+			P="${PROCESSED/:${a} */}"
+			echo "Found ${a} in ${man} and in ${P/* /}"
+		fi
+		PROCESSED="${man}:${a} ${PROCESSED}"
+		if [ "${IGNORE/$man/}" != "${IGNORE}" ]; then
+			continue
+		fi
+		if ! grep -q '\*'${a}'\*' $MAIN_FILE; then
+			if [ "$last" == "" ]; then
+				echo
+			fi
+			if [ "$last" != "$man" ]; then
+				echo "Missing functions from $MAIN_FILE that are in $man"
+				last=$man
+			fi
+			echo "   ${a}"
+		fi
+	done
+done
+
+DEPRECATED="*tep_print_field*"
+
+# Should not be used by applications, only internal use by trace-cmd
+IGNORE="*kbuffer_set_old_format* *kbuffer_raw_get* *kbuffer_ptr_delta* *kbuffer_translate_data*"
+
+HEADER=event-parse.h
+
+sed -ne 's/^[a-z].*[ \*]\([a-z_][a-z_]*\)(.*/\1/p' -e 's/^\([a-z_][a-z_]*\)(.*/\1/p' ../include/traceevent/{event-parse,trace-seq,kbuffer}.h | while read f; do
+	if ! grep -q '\*'${f}'\*' $MAIN_FILE; then
+		if [ "${DEPRECATED/\*$f\*/}" != "${DEPRECATED}" ]; then
+			continue;
+		fi
+		if [ "${IGNORE/\*$f\*/}" != "${IGNORE}" ]; then
+			continue;
+		fi
+		for head in event-parse.h trace-seq.h kbuffer.h; do
+			if grep -q $f ../include/traceevent/$head; then
+				if [ "$HEADER" != "$head" ]; then
+					last=""
+					HEADER=$head
+					break
+				fi
+			fi
+		done
+		if [ "$last" == "" ]; then
+			echo
+			echo "Missing functions from $MAIN_FILE that are in $HEADER"
+			last=$f
+		fi
+		echo "   ${f}"
+	fi
+done
diff --git a/include/asm/bug.h b/include/asm/bug.h
new file mode 100644
index 0000000..de8f8fe
--- /dev/null
+++ b/include/asm/bug.h
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _TOOLS_ASM_BUG_H
+#define _TOOLS_ASM_BUG_H
+
+#include <linux/compiler.h>
+#include <stdio.h>
+
+#define __WARN_printf(arg...)	do { fprintf(stderr, arg); fprintf(stderr, "\n");} while (0)
+
+#define WARN(condition, format...) ({		\
+	int __ret_warn_on = !!(condition);	\
+	if (unlikely(__ret_warn_on))		\
+		__WARN_printf(format);		\
+	unlikely(__ret_warn_on);		\
+})
+
+#define WARN_ON(condition) ({					\
+	int __ret_warn_on = !!(condition);			\
+	if (unlikely(__ret_warn_on))				\
+		__WARN_printf("assertion failed at %s:%d\n",	\
+				__FILE__, __LINE__);		\
+	unlikely(__ret_warn_on);				\
+})
+
+#define WARN_ON_ONCE(condition) ({			\
+	static int __warned;				\
+	int __ret_warn_once = !!(condition);		\
+							\
+	if (unlikely(__ret_warn_once && !__warned)) {	\
+		__warned = true;			\
+		WARN_ON(1);				\
+	}						\
+	unlikely(__ret_warn_once);			\
+})
+
+#define WARN_ONCE(condition, format...)	({	\
+	static int __warned;			\
+	int __ret_warn_once = !!(condition);	\
+						\
+	if (unlikely(__ret_warn_once))		\
+		if (WARN(!__warned, format)) 	\
+			__warned = 1;		\
+	unlikely(__ret_warn_once);		\
+})
+
+#endif /* _TOOLS_ASM_BUG_H */
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
new file mode 100644
index 0000000..b9d4322
--- /dev/null
+++ b/include/linux/compiler-gcc.h
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _TOOLS_LINUX_COMPILER_H_
+#error "Please don't include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead."
+#endif
+
+/*
+ * Common definitions for all gcc versions go here.
+ */
+#ifndef GCC_VERSION
+#define GCC_VERSION (__GNUC__ * 10000		\
+		     + __GNUC_MINOR__ * 100	\
+		     + __GNUC_PATCHLEVEL__)
+#endif
+
+#if GCC_VERSION >= 70000 && !defined(__CHECKER__)
+# define __fallthrough __attribute__ ((fallthrough))
+#endif
+
+#if GCC_VERSION >= 40300
+# define __compiletime_error(message) __attribute__((error(message)))
+#endif /* GCC_VERSION >= 40300 */
+
+/* &a[0] degrades to a pointer: a different type from an array */
+#define __must_be_array(a)	BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
+
+#ifndef __pure
+#define  __pure		__attribute__((pure))
+#endif
+#define  noinline	__attribute__((noinline))
+#ifdef __has_attribute
+#if __has_attribute(disable_tail_calls)
+#define __no_tail_call	__attribute__((disable_tail_calls))
+#endif
+#endif
+#ifndef __no_tail_call
+#if GCC_VERSION > 40201
+#define __no_tail_call	__attribute__((optimize("no-optimize-sibling-calls")))
+#else
+#define __no_tail_call
+#endif
+#endif
+#ifndef __packed
+#define __packed	__attribute__((packed))
+#endif
+#ifndef __noreturn
+#define __noreturn	__attribute__((noreturn))
+#endif
+#ifndef __aligned
+#define __aligned(x)	__attribute__((aligned(x)))
+#endif
+#define __printf(a, b)	__attribute__((format(printf, a, b)))
+#define __scanf(a, b)	__attribute__((format(scanf, a, b)))
+
+#if GCC_VERSION >= 50100
+#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
+#endif
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
new file mode 100644
index 0000000..2b3f735
--- /dev/null
+++ b/include/linux/compiler.h
@@ -0,0 +1,206 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _TOOLS_LINUX_COMPILER_H_
+#define _TOOLS_LINUX_COMPILER_H_
+
+#ifdef __GNUC__
+#include <linux/compiler-gcc.h>
+#endif
+
+#ifndef __compiletime_error
+# define __compiletime_error(message)
+#endif
+
+#ifdef __OPTIMIZE__
+# define __compiletime_assert(condition, msg, prefix, suffix)		\
+	do {								\
+		extern void prefix ## suffix(void) __compiletime_error(msg); \
+		if (!(condition))					\
+			prefix ## suffix();				\
+	} while (0)
+#else
+# define __compiletime_assert(condition, msg, prefix, suffix) do { } while (0)
+#endif
+
+#define _compiletime_assert(condition, msg, prefix, suffix) \
+	__compiletime_assert(condition, msg, prefix, suffix)
+
+/**
+ * compiletime_assert - break build and emit msg if condition is false
+ * @condition: a compile-time constant condition to check
+ * @msg:       a message to emit if condition is false
+ *
+ * In tradition of POSIX assert, this macro will break the build if the
+ * supplied condition is *false*, emitting the supplied error message if the
+ * compiler has support to do so.
+ */
+#define compiletime_assert(condition, msg) \
+	_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
+
+/* Optimization barrier */
+/* The "volatile" is due to gcc bugs */
+#define barrier() __asm__ __volatile__("": : :"memory")
+
+#ifndef __always_inline
+# define __always_inline	inline __attribute__((always_inline))
+#endif
+
+#ifndef noinline
+#define noinline
+#endif
+#ifndef __no_tail_call
+#define __no_tail_call
+#endif
+
+/* Are two types/vars the same type (ignoring qualifiers)? */
+#ifndef __same_type
+# define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
+#endif
+
+#ifdef __ANDROID__
+/*
+ * FIXME: Big hammer to get rid of tons of:
+ *   "warning: always_inline function might not be inlinable"
+ *
+ * At least on android-ndk-r12/platforms/android-24/arch-arm
+ */
+#undef __always_inline
+#define __always_inline	inline
+#endif
+
+#define __user
+#define __rcu
+#define __read_mostly
+
+#ifndef __attribute_const__
+# define __attribute_const__
+#endif
+
+#ifndef __maybe_unused
+# define __maybe_unused		__attribute__((unused))
+#endif
+
+#ifndef __used
+# define __used		__attribute__((__unused__))
+#endif
+
+#ifndef __packed
+# define __packed		__attribute__((__packed__))
+#endif
+
+#ifndef __force
+# define __force
+#endif
+
+#ifndef __weak
+# define __weak			__attribute__((weak))
+#endif
+
+#ifndef likely
+# define likely(x)		__builtin_expect(!!(x), 1)
+#endif
+
+#ifndef unlikely
+# define unlikely(x)		__builtin_expect(!!(x), 0)
+#endif
+
+#ifndef __init
+# define __init
+#endif
+
+#ifndef noinline
+# define noinline
+#endif
+
+#include <linux/types.h>
+
+/*
+ * Following functions are taken from kernel sources and
+ * break aliasing rules in their original form.
+ *
+ * While kernel is compiled with -fno-strict-aliasing,
+ * perf uses -Wstrict-aliasing=3 which makes build fail
+ * under gcc 4.4.
+ *
+ * Using extra __may_alias__ type to allow aliasing
+ * in this case.
+ */
+typedef __u8  __attribute__((__may_alias__))  __u8_alias_t;
+typedef __u16 __attribute__((__may_alias__)) __u16_alias_t;
+typedef __u32 __attribute__((__may_alias__)) __u32_alias_t;
+typedef __u64 __attribute__((__may_alias__)) __u64_alias_t;
+
+static __always_inline void __read_once_size(const volatile void *p, void *res, int size)
+{
+	switch (size) {
+	case 1: *(__u8_alias_t  *) res = *(volatile __u8_alias_t  *) p; break;
+	case 2: *(__u16_alias_t *) res = *(volatile __u16_alias_t *) p; break;
+	case 4: *(__u32_alias_t *) res = *(volatile __u32_alias_t *) p; break;
+	case 8: *(__u64_alias_t *) res = *(volatile __u64_alias_t *) p; break;
+	default:
+		barrier();
+		__builtin_memcpy((void *)res, (const void *)p, size);
+		barrier();
+	}
+}
+
+static __always_inline void __write_once_size(volatile void *p, void *res, int size)
+{
+	switch (size) {
+	case 1: *(volatile  __u8_alias_t *) p = *(__u8_alias_t  *) res; break;
+	case 2: *(volatile __u16_alias_t *) p = *(__u16_alias_t *) res; break;
+	case 4: *(volatile __u32_alias_t *) p = *(__u32_alias_t *) res; break;
+	case 8: *(volatile __u64_alias_t *) p = *(__u64_alias_t *) res; break;
+	default:
+		barrier();
+		__builtin_memcpy((void *)p, (const void *)res, size);
+		barrier();
+	}
+}
+
+/*
+ * Prevent the compiler from merging or refetching reads or writes. The
+ * compiler is also forbidden from reordering successive instances of
+ * READ_ONCE and WRITE_ONCE, but only when the compiler is aware of some
+ * particular ordering. One way to make the compiler aware of ordering is to
+ * put the two invocations of READ_ONCE or WRITE_ONCE in different C
+ * statements.
+ *
+ * These two macros will also work on aggregate data types like structs or
+ * unions. If the size of the accessed data type exceeds the word size of
+ * the machine (e.g., 32 bits or 64 bits) READ_ONCE() and WRITE_ONCE() will
+ * fall back to memcpy and print a compile-time warning.
+ *
+ * Their two major use cases are: (1) Mediating communication between
+ * process-level code and irq/NMI handlers, all running on the same CPU,
+ * and (2) Ensuring that the compiler does not fold, spindle, or otherwise
+ * mutilate accesses that either do not require ordering or that interact
+ * with an explicit memory barrier or atomic instruction that provides the
+ * required ordering.
+ */
+
+#define READ_ONCE(x)					\
+({							\
+	union { typeof(x) __val; char __c[1]; } __u =	\
+		{ .__c = { 0 } };			\
+	__read_once_size(&(x), __u.__c, sizeof(x));	\
+	__u.__val;					\
+})
+
+#define WRITE_ONCE(x, val)				\
+({							\
+	union { typeof(x) __val; char __c[1]; } __u =	\
+		{ .__val = (val) }; 			\
+	__write_once_size(&(x), __u.__c, sizeof(x));	\
+	__u.__val;					\
+})
+
+
+#ifndef __fallthrough
+# define __fallthrough
+#endif
+
+/* Indirect macros required for expanded argument pasting, eg. __LINE__. */
+#define ___PASTE(a, b) a##b
+#define __PASTE(a, b) ___PASTE(a, b)
+
+#endif /* _TOOLS_LINUX_COMPILER_H */
diff --git a/include/linux/time64.h b/include/linux/time64.h
new file mode 100644
index 0000000..55fa644
--- /dev/null
+++ b/include/linux/time64.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _TOOLS_LINUX_TIME64_H
+#define _TOOLS_LINUX_TIME64_H
+
+#define MSEC_PER_SEC	1000L
+#define USEC_PER_MSEC	1000L
+#define NSEC_PER_USEC	1000L
+#define NSEC_PER_MSEC	1000000L
+#define USEC_PER_SEC	1000000L
+#define NSEC_PER_SEC	1000000000L
+#define FSEC_PER_SEC	1000000000000000LL
+
+#endif /* _LINUX_TIME64_H */
diff --git a/include/traceevent/event-parse.h b/include/traceevent/event-parse.h
new file mode 100644
index 0000000..2171ad7
--- /dev/null
+++ b/include/traceevent/event-parse.h
@@ -0,0 +1,823 @@
+/* SPDX-License-Identifier: LGPL-2.1 */
+/*
+ * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ *
+ */
+#ifndef __TEP_PARSE_EVENTS_H
+#define __TEP_PARSE_EVENTS_H
+
+#include <stdbool.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <regex.h>
+#include <string.h>
+
+#include "trace-seq.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef __maybe_unused
+#define __maybe_unused __attribute__((unused))
+#endif
+
+#ifndef DEBUG_RECORD
+#define DEBUG_RECORD 0
+#endif
+
+struct tep_record {
+	unsigned long long	ts;
+	unsigned long long	offset;
+	long long		missed_events;	/* buffer dropped events before */
+	int			record_size;	/* size of binary record */
+	int			size;		/* size of data */
+	void			*data;
+	int			cpu;
+	int			ref_count;
+	int			locked;		/* Do not free, even if ref_count is zero */
+	void			*priv;
+#if DEBUG_RECORD
+	struct tep_record	*prev;
+	struct tep_record	*next;
+	long			alloc_addr;
+#endif
+};
+
+/* ----------------------- tep ----------------------- */
+
+struct tep_handle;
+struct tep_event;
+
+typedef int (*tep_event_handler_func)(struct trace_seq *s,
+				      struct tep_record *record,
+				      struct tep_event *event,
+				      void *context);
+
+typedef int (*tep_plugin_load_func)(struct tep_handle *tep);
+typedef int (*tep_plugin_unload_func)(struct tep_handle *tep);
+
+struct tep_plugin_option {
+	struct tep_plugin_option	*next;
+	void				*handle;
+	char				*file;
+	char				*name;
+	char				*plugin_alias;
+	char				*description;
+	const char			*value;
+	void				*priv;
+	int				set;
+};
+
+/*
+ * Plugin hooks that can be called:
+ *
+ * TEP_PLUGIN_LOADER:  (required)
+ *   The function name to initialized the plugin.
+ *
+ *   int TEP_PLUGIN_LOADER(struct tep_handle *tep)
+ *
+ * TEP_PLUGIN_UNLOADER:  (optional)
+ *   The function called just before unloading
+ *
+ *   int TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
+ *
+ * TEP_PLUGIN_OPTIONS:  (optional)
+ *   Plugin options that can be set before loading
+ *
+ *   struct tep_plugin_option TEP_PLUGIN_OPTIONS[] = {
+ *	{
+ *		.name = "option-name",
+ *		.plugin_alias = "override-file-name", (optional)
+ *		.description = "description of option to show users",
+ *	},
+ *	{
+ *		.name = NULL,
+ *	},
+ *   };
+ *
+ *   Array must end with .name = NULL;
+ *
+ *
+ *   .plugin_alias is used to give a shorter name to access
+ *   the vairable. Useful if a plugin handles more than one event.
+ *
+ *   If .value is not set, then it is considered a boolean and only
+ *   .set will be processed. If .value is defined, then it is considered
+ *   a string option and .set will be ignored.
+ *
+ * TEP_PLUGIN_ALIAS: (optional)
+ *   The name to use for finding options (uses filename if not defined)
+ */
+#define TEP_PLUGIN_LOADER tep_plugin_loader
+#define TEP_PLUGIN_UNLOADER tep_plugin_unloader
+#define TEP_PLUGIN_OPTIONS tep_plugin_options
+#define TEP_PLUGIN_ALIAS tep_plugin_alias
+#define _MAKE_STR(x)	#x
+#define MAKE_STR(x)	_MAKE_STR(x)
+#define TEP_PLUGIN_LOADER_NAME MAKE_STR(TEP_PLUGIN_LOADER)
+#define TEP_PLUGIN_UNLOADER_NAME MAKE_STR(TEP_PLUGIN_UNLOADER)
+#define TEP_PLUGIN_OPTIONS_NAME MAKE_STR(TEP_PLUGIN_OPTIONS)
+#define TEP_PLUGIN_ALIAS_NAME MAKE_STR(TEP_PLUGIN_ALIAS)
+
+enum tep_format_flags {
+	TEP_FIELD_IS_ARRAY	= 1,
+	TEP_FIELD_IS_POINTER	= 2,
+	TEP_FIELD_IS_SIGNED	= 4,
+	TEP_FIELD_IS_STRING	= 8,
+	TEP_FIELD_IS_DYNAMIC	= 16,
+	TEP_FIELD_IS_LONG	= 32,
+	TEP_FIELD_IS_FLAG	= 64,
+	TEP_FIELD_IS_SYMBOLIC	= 128,
+	TEP_FIELD_IS_RELATIVE	= 256,
+};
+
+struct tep_format_field {
+	struct tep_format_field	*next;
+	struct tep_event	*event;
+	char			*type;
+	char			*name;
+	char			*alias;
+	int			offset;
+	int			size;
+	unsigned int		arraylen;
+	unsigned int		elementsize;
+	unsigned long		flags;
+};
+
+struct tep_format {
+	int			nr_common;
+	int			nr_fields;
+	struct tep_format_field	*common_fields;
+	struct tep_format_field	*fields;
+};
+
+struct tep_print_arg_atom {
+	char			*atom;
+};
+
+struct tep_print_arg_string {
+	char			*string;
+	int			offset;		// for backward compatibility
+	struct tep_format_field	*field;
+};
+
+struct tep_print_arg_bitmask {
+	char			*bitmask;
+	int			offset;		// for backward compatibility
+	struct tep_format_field	*field;
+};
+
+struct tep_print_arg_field {
+	char			*name;
+	struct tep_format_field	*field;
+};
+
+struct tep_print_flag_sym {
+	struct tep_print_flag_sym	*next;
+	char				*value;
+	char				*str;
+};
+
+struct tep_print_arg_typecast {
+	char 			*type;
+	struct tep_print_arg	*item;
+};
+
+struct tep_print_arg_flags {
+	struct tep_print_arg		*field;
+	char				*delim;
+	struct tep_print_flag_sym	*flags;
+};
+
+struct tep_print_arg_symbol {
+	struct tep_print_arg		*field;
+	struct tep_print_flag_sym	*symbols;
+};
+
+struct tep_print_arg_hex {
+	struct tep_print_arg	*field;
+	struct tep_print_arg	*size;
+};
+
+struct tep_print_arg_int_array {
+	struct tep_print_arg	*field;
+	struct tep_print_arg	*count;
+	struct tep_print_arg	*el_size;
+};
+
+struct tep_print_arg_dynarray {
+	struct tep_format_field	*field;
+	struct tep_print_arg	*index;
+};
+
+struct tep_print_arg;
+
+struct tep_print_arg_op {
+	char			*op;
+	int			prio;
+	struct tep_print_arg	*left;
+	struct tep_print_arg	*right;
+};
+
+struct tep_function_handler;
+
+struct tep_print_arg_func {
+	struct tep_function_handler	*func;
+	struct tep_print_arg		*args;
+};
+
+enum tep_print_arg_type {
+	TEP_PRINT_NULL,
+	TEP_PRINT_ATOM,
+	TEP_PRINT_FIELD,
+	TEP_PRINT_FLAGS,
+	TEP_PRINT_SYMBOL,
+	TEP_PRINT_HEX,
+	TEP_PRINT_INT_ARRAY,
+	TEP_PRINT_TYPE,
+	TEP_PRINT_STRING,
+	TEP_PRINT_BSTRING,
+	TEP_PRINT_DYNAMIC_ARRAY,
+	TEP_PRINT_OP,
+	TEP_PRINT_FUNC,
+	TEP_PRINT_BITMASK,
+	TEP_PRINT_DYNAMIC_ARRAY_LEN,
+	TEP_PRINT_HEX_STR,
+	TEP_PRINT_CPUMASK,
+};
+
+struct tep_print_arg {
+	struct tep_print_arg		*next;
+	enum tep_print_arg_type		type;
+	union {
+		struct tep_print_arg_atom	atom;
+		struct tep_print_arg_field	field;
+		struct tep_print_arg_typecast	typecast;
+		struct tep_print_arg_flags	flags;
+		struct tep_print_arg_symbol	symbol;
+		struct tep_print_arg_hex	hex;
+		struct tep_print_arg_int_array	int_array;
+		struct tep_print_arg_func	func;
+		struct tep_print_arg_string	string;
+		struct tep_print_arg_bitmask	bitmask;
+		struct tep_print_arg_op		op;
+		struct tep_print_arg_dynarray	dynarray;
+	};
+};
+
+struct tep_print_parse;
+
+struct tep_print_fmt {
+	char			*format;
+	struct tep_print_arg	*args;
+	struct tep_print_parse	*print_cache;
+};
+
+struct tep_event {
+	struct tep_handle	*tep;
+	char			*name;
+	int			id;
+	int			flags;
+	struct tep_format	format;
+	struct tep_print_fmt	print_fmt;
+	char			*system;
+	tep_event_handler_func	handler;
+	void			*context;
+};
+
+enum {
+	TEP_EVENT_FL_ISFTRACE	= 0x01,
+	TEP_EVENT_FL_ISPRINT	= 0x02,
+	TEP_EVENT_FL_ISBPRINT	= 0x04,
+	TEP_EVENT_FL_ISFUNCENT	= 0x10,
+	TEP_EVENT_FL_ISFUNCRET	= 0x20,
+	TEP_EVENT_FL_NOHANDLE	= 0x40,
+	TEP_EVENT_FL_PRINTRAW	= 0x80,
+
+	TEP_EVENT_FL_FAILED	= 0x80000000
+};
+
+enum tep_event_sort_type {
+	TEP_EVENT_SORT_ID,
+	TEP_EVENT_SORT_NAME,
+	TEP_EVENT_SORT_SYSTEM,
+};
+
+enum tep_event_type {
+	TEP_EVENT_ERROR,
+	TEP_EVENT_NONE,
+	TEP_EVENT_SPACE,
+	TEP_EVENT_NEWLINE,
+	TEP_EVENT_OP,
+	TEP_EVENT_DELIM,
+	TEP_EVENT_ITEM,
+	TEP_EVENT_DQUOTE,
+	TEP_EVENT_SQUOTE,
+};
+
+typedef unsigned long long (*tep_func_handler)(struct trace_seq *s,
+					       unsigned long long *args);
+
+enum tep_func_arg_type {
+	TEP_FUNC_ARG_VOID,
+	TEP_FUNC_ARG_INT,
+	TEP_FUNC_ARG_LONG,
+	TEP_FUNC_ARG_STRING,
+	TEP_FUNC_ARG_PTR,
+	TEP_FUNC_ARG_MAX_TYPES
+};
+
+enum tep_flag {
+	TEP_NSEC_OUTPUT		= 1,	/* output in NSECS */
+	TEP_DISABLE_SYS_PLUGINS	= 1 << 1,
+	TEP_DISABLE_PLUGINS	= 1 << 2,
+};
+
+#define TEP_ERRORS 							      \
+	_PE(MEM_ALLOC_FAILED,	"failed to allocate memory"),		      \
+	_PE(PARSE_EVENT_FAILED,	"failed to parse event"),		      \
+	_PE(READ_ID_FAILED,	"failed to read event id"),		      \
+	_PE(READ_FORMAT_FAILED,	"failed to read event format"),		      \
+	_PE(READ_PRINT_FAILED,	"failed to read event print fmt"), 	      \
+	_PE(OLD_FTRACE_ARG_FAILED,"failed to allocate field name for ftrace"),\
+	_PE(INVALID_ARG_TYPE,	"invalid argument type"),		      \
+	_PE(INVALID_EXP_TYPE,	"invalid expression type"),		      \
+	_PE(INVALID_OP_TYPE,	"invalid operator type"),		      \
+	_PE(INVALID_EVENT_NAME,	"invalid event name"),			      \
+	_PE(EVENT_NOT_FOUND,	"no event found"),			      \
+	_PE(SYNTAX_ERROR,	"syntax error"),			      \
+	_PE(ILLEGAL_RVALUE,	"illegal rvalue"),			      \
+	_PE(ILLEGAL_LVALUE,	"illegal lvalue for string comparison"),      \
+	_PE(INVALID_REGEX,	"regex did not compute"),		      \
+	_PE(ILLEGAL_STRING_CMP,	"illegal comparison for string"), 	      \
+	_PE(ILLEGAL_INTEGER_CMP,"illegal comparison for integer"), 	      \
+	_PE(REPARENT_NOT_OP,	"cannot reparent other than OP"),	      \
+	_PE(REPARENT_FAILED,	"failed to reparent filter OP"),	      \
+	_PE(BAD_FILTER_ARG,	"bad arg in filter tree"),		      \
+	_PE(UNEXPECTED_TYPE,	"unexpected type (not a value)"),	      \
+	_PE(ILLEGAL_TOKEN,	"illegal token"),			      \
+	_PE(INVALID_PAREN,	"open parenthesis cannot come here"), 	      \
+	_PE(UNBALANCED_PAREN,	"unbalanced number of parenthesis"),	      \
+	_PE(UNKNOWN_TOKEN,	"unknown token"),			      \
+	_PE(FILTER_NOT_FOUND,	"no filter found"),			      \
+	_PE(NOT_A_NUMBER,	"must have number field"),		      \
+	_PE(NO_FILTER,		"no filters exists"),			      \
+	_PE(FILTER_MISS,	"record does not match to filter")
+
+#undef _PE
+#define _PE(__code, __str) TEP_ERRNO__ ## __code
+enum tep_errno {
+	TEP_ERRNO__SUCCESS			= 0,
+	TEP_ERRNO__FILTER_MATCH			= TEP_ERRNO__SUCCESS,
+
+	/*
+	 * Choose an arbitrary negative big number not to clash with standard
+	 * errno since SUS requires the errno has distinct positive values.
+	 * See 'Issue 6' in the link below.
+	 *
+	 * https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/errno.h.html
+	 */
+	__TEP_ERRNO__START			= -100000,
+
+	TEP_ERRORS,
+
+	__TEP_ERRNO__END,
+};
+#undef _PE
+
+struct tep_plugin_list;
+
+#define INVALID_PLUGIN_LIST_OPTION	((char **)((unsigned long)-1))
+
+enum tep_plugin_load_priority {
+	TEP_PLUGIN_FIRST,
+	TEP_PLUGIN_LAST,
+};
+
+int tep_add_plugin_path(struct tep_handle *tep, char *path,
+			enum tep_plugin_load_priority prio);
+struct tep_plugin_list *tep_load_plugins(struct tep_handle *tep);
+void tep_unload_plugins(struct tep_plugin_list *plugin_list,
+			struct tep_handle *tep);
+void tep_load_plugins_hook(struct tep_handle *tep, const char *suffix,
+			   void (*load_plugin)(struct tep_handle *tep,
+					       const char *path,
+					       const char *name,
+					       void *data),
+			   void *data);
+char **tep_plugin_list_options(void);
+void tep_plugin_free_options_list(char **list);
+int tep_plugin_add_options(const char *name,
+			   struct tep_plugin_option *options);
+int tep_plugin_add_option(const char *name, const char *val);
+void tep_plugin_remove_options(struct tep_plugin_option *options);
+void tep_plugin_print_options(struct trace_seq *s);
+void tep_print_plugins(struct trace_seq *s,
+			const char *prefix, const char *suffix,
+			const struct tep_plugin_list *list);
+
+/* tep_handle */
+typedef char *(tep_func_resolver_t)(void *priv,
+				    unsigned long long *addrp, char **modp);
+void tep_set_flag(struct tep_handle *tep, int flag);
+void tep_clear_flag(struct tep_handle *tep, enum tep_flag flag);
+bool tep_test_flag(struct tep_handle *tep, enum tep_flag flags);
+
+static inline int tep_is_bigendian(void)
+{
+	unsigned char str[] = { 0x1, 0x2, 0x3, 0x4 };
+	unsigned int val;
+
+	memcpy(&val, str, 4);
+	return val == 0x01020304;
+}
+
+/* taken from kernel/trace/trace.h */
+enum trace_flag_type {
+	TRACE_FLAG_IRQS_OFF		= 0x01,
+	TRACE_FLAG_IRQS_NOSUPPORT	= 0x02,
+	TRACE_FLAG_NEED_RESCHED		= 0x04,
+	TRACE_FLAG_HARDIRQ		= 0x08,
+	TRACE_FLAG_SOFTIRQ		= 0x10,
+};
+
+int tep_set_function_resolver(struct tep_handle *tep,
+			      tep_func_resolver_t *func, void *priv);
+void tep_reset_function_resolver(struct tep_handle *tep);
+int tep_register_comm(struct tep_handle *tep, const char *comm, int pid);
+int tep_override_comm(struct tep_handle *tep, const char *comm, int pid);
+int tep_parse_saved_cmdlines(struct tep_handle *tep, const char *buf);
+int tep_parse_kallsyms(struct tep_handle *tep, const char *kallsyms);
+int tep_register_function(struct tep_handle *tep, char *name,
+			  unsigned long long addr, char *mod);
+int tep_parse_printk_formats(struct tep_handle *tep, const char *buf);
+int tep_register_print_string(struct tep_handle *tep, const char *fmt,
+			      unsigned long long addr);
+bool tep_is_pid_registered(struct tep_handle *tep, int pid);
+
+struct tep_event *tep_get_event(struct tep_handle *tep, int index);
+
+#define TEP_PRINT_INFO		"INFO"
+#define TEP_PRINT_INFO_RAW	"INFO_RAW"
+#define TEP_PRINT_COMM		"COMM"
+#define TEP_PRINT_LATENCY	"LATENCY"
+#define TEP_PRINT_NAME		"NAME"
+#define TEP_PRINT_PID		1U
+#define TEP_PRINT_TIME		2U
+#define TEP_PRINT_CPU		3U
+
+void tep_print_event(struct tep_handle *tep, struct trace_seq *s,
+		     struct tep_record *record, const char *fmt, ...)
+	__attribute__ ((format (printf, 4, 5)));
+
+int tep_parse_header_page(struct tep_handle *tep, char *buf, unsigned long size,
+			  int long_size);
+
+enum tep_errno tep_parse_event(struct tep_handle *tep, const char *buf,
+			       unsigned long size, const char *sys);
+enum tep_errno tep_parse_format(struct tep_handle *tep,
+				struct tep_event **eventp,
+				const char *buf,
+				unsigned long size, const char *sys);
+
+void *tep_get_field_raw(struct trace_seq *s, struct tep_event *event,
+			const char *name, struct tep_record *record,
+			int *len, int err);
+
+int tep_get_field_val(struct trace_seq *s, struct tep_event *event,
+		      const char *name, struct tep_record *record,
+		      unsigned long long *val, int err);
+int tep_get_common_field_val(struct trace_seq *s, struct tep_event *event,
+			     const char *name, struct tep_record *record,
+			     unsigned long long *val, int err);
+int tep_get_any_field_val(struct trace_seq *s, struct tep_event *event,
+			  const char *name, struct tep_record *record,
+			  unsigned long long *val, int err);
+
+int tep_print_num_field(struct trace_seq *s, const char *fmt,
+			struct tep_event *event, const char *name,
+			struct tep_record *record, int err);
+
+int tep_print_func_field(struct trace_seq *s, const char *fmt,
+			 struct tep_event *event, const char *name,
+			 struct tep_record *record, int err);
+
+enum tep_reg_handler {
+	TEP_REGISTER_SUCCESS = 0,
+	TEP_REGISTER_SUCCESS_OVERWRITE,
+};
+
+int tep_register_event_handler(struct tep_handle *tep, int id,
+			       const char *sys_name, const char *event_name,
+			       tep_event_handler_func func, void *context);
+int tep_unregister_event_handler(struct tep_handle *tep, int id,
+				 const char *sys_name, const char *event_name,
+				 tep_event_handler_func func, void *context);
+int tep_register_print_function(struct tep_handle *tep,
+				tep_func_handler func,
+				enum tep_func_arg_type ret_type,
+				char *name, ...);
+int tep_unregister_print_function(struct tep_handle *tep,
+				  tep_func_handler func, char *name);
+
+struct tep_format_field *tep_find_common_field(struct tep_event *event, const char *name);
+struct tep_format_field *tep_find_field(struct tep_event *event, const char *name);
+struct tep_format_field *tep_find_any_field(struct tep_event *event, const char *name);
+
+const char *tep_find_function(struct tep_handle *tep, unsigned long long addr);
+unsigned long long
+tep_find_function_address(struct tep_handle *tep, unsigned long long addr);
+int tep_find_function_info(struct tep_handle *tep, unsigned long long addr,
+			   const char **name, unsigned long long *start,
+			   unsigned long *size);
+unsigned long long tep_read_number(struct tep_handle *tep, const void *ptr, int size);
+int tep_read_number_field(struct tep_format_field *field, const void *data,
+			  unsigned long long *value);
+
+struct tep_event *tep_get_first_event(struct tep_handle *tep);
+int tep_get_events_count(struct tep_handle *tep);
+struct tep_event *tep_find_event(struct tep_handle *tep, int id);
+
+struct tep_event *
+tep_find_event_by_name(struct tep_handle *tep, const char *sys, const char *name);
+struct tep_event *
+tep_find_event_by_record(struct tep_handle *tep, struct tep_record *record);
+
+int tep_data_type(struct tep_handle *tep, struct tep_record *rec);
+int tep_data_pid(struct tep_handle *tep, struct tep_record *rec);
+int tep_data_preempt_count(struct tep_handle *tep, struct tep_record *rec);
+int tep_data_flags(struct tep_handle *tep, struct tep_record *rec);
+const char *tep_data_comm_from_pid(struct tep_handle *tep, int pid);
+struct tep_cmdline;
+struct tep_cmdline *tep_data_pid_from_comm(struct tep_handle *tep, const char *comm,
+					   struct tep_cmdline *next);
+int tep_cmdline_pid(struct tep_handle *tep, struct tep_cmdline *cmdline);
+
+void tep_print_field_content(struct trace_seq *s, void *data, int size,
+			     struct tep_format_field *field);
+void tep_record_print_fields(struct trace_seq *s,
+			     struct tep_record *record,
+			     struct tep_event *event);
+void tep_record_print_selected_fields(struct trace_seq *s,
+				      struct tep_record *record,
+				      struct tep_event *event,
+				      unsigned long long select_mask);
+void tep_print_fields(struct trace_seq *s, void *data,
+		      int size __maybe_unused, struct tep_event *event);
+int tep_strerror(struct tep_handle *tep, enum tep_errno errnum,
+		 char *buf, size_t buflen);
+
+struct tep_event **tep_list_events(struct tep_handle *tep, enum tep_event_sort_type);
+struct tep_event **tep_list_events_copy(struct tep_handle *tep,
+					enum tep_event_sort_type);
+struct tep_format_field **tep_event_common_fields(struct tep_event *event);
+struct tep_format_field **tep_event_fields(struct tep_event *event);
+
+int tep_get_function_count(struct tep_handle *tep);
+
+enum tep_endian {
+        TEP_LITTLE_ENDIAN = 0,
+        TEP_BIG_ENDIAN
+};
+int tep_get_cpus(struct tep_handle *tep);
+void tep_set_cpus(struct tep_handle *tep, int cpus);
+int tep_get_long_size(struct tep_handle *tep);
+void tep_set_long_size(struct tep_handle *tep, int long_size);
+int tep_get_page_size(struct tep_handle *tep);
+int tep_get_sub_buffer_size(struct tep_handle *tep);
+void tep_set_page_size(struct tep_handle *tep, int _page_size);
+bool tep_is_file_bigendian(struct tep_handle *tep);
+void tep_set_file_bigendian(struct tep_handle *tep, enum tep_endian endian);
+bool tep_is_local_bigendian(struct tep_handle *tep);
+void tep_set_local_bigendian(struct tep_handle *tep, enum tep_endian endian);
+int tep_get_header_page_size(struct tep_handle *tep);
+int tep_get_header_timestamp_size(struct tep_handle *tep);
+bool tep_is_old_format(struct tep_handle *tep);
+void tep_set_test_filters(struct tep_handle *tep, int test_filters);
+
+struct tep_handle *tep_alloc(void);
+void tep_free(struct tep_handle *tep);
+void tep_ref(struct tep_handle *tep);
+void tep_unref(struct tep_handle *tep);
+int tep_get_ref(struct tep_handle *tep);
+
+struct kbuffer *tep_kbuffer(struct tep_handle *tep);
+
+/* for debugging */
+void tep_print_funcs(struct tep_handle *tep);
+void tep_print_printk(struct tep_handle *tep);
+
+/* ----------------------- filtering ----------------------- */
+
+enum tep_filter_boolean_type {
+	TEP_FILTER_FALSE,
+	TEP_FILTER_TRUE,
+};
+
+enum tep_filter_op_type {
+	TEP_FILTER_OP_AND = 1,
+	TEP_FILTER_OP_OR,
+	TEP_FILTER_OP_NOT,
+};
+
+enum tep_filter_cmp_type {
+	TEP_FILTER_CMP_NONE,
+	TEP_FILTER_CMP_EQ,
+	TEP_FILTER_CMP_NE,
+	TEP_FILTER_CMP_GT,
+	TEP_FILTER_CMP_LT,
+	TEP_FILTER_CMP_GE,
+	TEP_FILTER_CMP_LE,
+	TEP_FILTER_CMP_MATCH,
+	TEP_FILTER_CMP_NOT_MATCH,
+	TEP_FILTER_CMP_REGEX,
+	TEP_FILTER_CMP_NOT_REGEX,
+};
+
+enum tep_filter_exp_type {
+	TEP_FILTER_EXP_NONE,
+	TEP_FILTER_EXP_ADD,
+	TEP_FILTER_EXP_SUB,
+	TEP_FILTER_EXP_MUL,
+	TEP_FILTER_EXP_DIV,
+	TEP_FILTER_EXP_MOD,
+	TEP_FILTER_EXP_RSHIFT,
+	TEP_FILTER_EXP_LSHIFT,
+	TEP_FILTER_EXP_AND,
+	TEP_FILTER_EXP_OR,
+	TEP_FILTER_EXP_XOR,
+	TEP_FILTER_EXP_NOT,
+};
+
+enum tep_filter_arg_type {
+	TEP_FILTER_ARG_NONE,
+	TEP_FILTER_ARG_BOOLEAN,
+	TEP_FILTER_ARG_VALUE,
+	TEP_FILTER_ARG_FIELD,
+	TEP_FILTER_ARG_EXP,
+	TEP_FILTER_ARG_OP,
+	TEP_FILTER_ARG_NUM,
+	TEP_FILTER_ARG_STR,
+};
+
+enum tep_filter_value_type {
+	TEP_FILTER_NUMBER,
+	TEP_FILTER_STRING,
+	TEP_FILTER_CHAR
+};
+
+struct tep_filter_arg;
+
+struct tep_filter_arg_boolean {
+	enum tep_filter_boolean_type	value;
+};
+
+struct tep_filter_arg_field {
+	struct tep_format_field		*field;
+};
+
+struct tep_filter_arg_value {
+	enum tep_filter_value_type	type;
+	union {
+		char			*str;
+		unsigned long long	val;
+	};
+};
+
+struct tep_filter_arg_op {
+	enum tep_filter_op_type		type;
+	struct tep_filter_arg		*left;
+	struct tep_filter_arg		*right;
+};
+
+struct tep_filter_arg_exp {
+	enum tep_filter_exp_type	type;
+	struct tep_filter_arg		*left;
+	struct tep_filter_arg		*right;
+};
+
+struct tep_filter_arg_num {
+	enum tep_filter_cmp_type	type;
+	struct tep_filter_arg		*left;
+	struct tep_filter_arg		*right;
+};
+
+struct tep_filter_arg_str {
+	enum tep_filter_cmp_type	type;
+	struct tep_format_field		*field;
+	char				*val;
+	char				*buffer;
+	regex_t				reg;
+};
+
+struct tep_filter_arg {
+	enum tep_filter_arg_type		type;
+	union {
+		struct tep_filter_arg_boolean	boolean;
+		struct tep_filter_arg_field	field;
+		struct tep_filter_arg_value	value;
+		struct tep_filter_arg_op	op;
+		struct tep_filter_arg_exp	exp;
+		struct tep_filter_arg_num	num;
+		struct tep_filter_arg_str	str;
+	};
+};
+
+struct tep_filter_type {
+	int			event_id;
+	struct tep_event	*event;
+	struct tep_filter_arg	*filter;
+};
+
+#define TEP_FILTER_ERROR_BUFSZ  1024
+
+struct tep_event_filter {
+	struct tep_handle	*tep;
+	int			filters;
+	struct tep_filter_type	*event_filters;
+	char			error_buffer[TEP_FILTER_ERROR_BUFSZ];
+};
+
+struct tep_event_filter *tep_filter_alloc(struct tep_handle *tep);
+
+/* for backward compatibility */
+#define FILTER_NONE		TEP_ERRNO__NO_FILTER
+#define FILTER_NOEXIST		TEP_ERRNO__FILTER_NOT_FOUND
+#define FILTER_MISS		TEP_ERRNO__FILTER_MISS
+#define FILTER_MATCH		TEP_ERRNO__FILTER_MATCH
+
+enum tep_errno tep_filter_add_filter_str(struct tep_event_filter *filter,
+					 const char *filter_str);
+
+enum tep_errno tep_filter_match(struct tep_event_filter *filter,
+				struct tep_record *record);
+
+int tep_filter_strerror(struct tep_event_filter *filter, enum tep_errno err,
+			char *buf, size_t buflen);
+
+int tep_event_filtered(struct tep_event_filter *filter,
+		       int event_id);
+
+void tep_filter_reset(struct tep_event_filter *filter);
+
+void tep_filter_free(struct tep_event_filter *filter);
+
+char *tep_filter_make_string(struct tep_event_filter *filter, int event_id);
+
+int tep_filter_remove_event(struct tep_event_filter *filter,
+			    int event_id);
+
+int tep_filter_copy(struct tep_event_filter *dest, struct tep_event_filter *source);
+
+int tep_filter_compare(struct tep_event_filter *filter1, struct tep_event_filter *filter2);
+
+/* Control library logs */
+enum tep_loglevel {
+	TEP_LOG_NONE = 0,
+	TEP_LOG_CRITICAL,
+	TEP_LOG_ERROR,
+	TEP_LOG_WARNING,
+	TEP_LOG_INFO,
+	TEP_LOG_DEBUG,
+	TEP_LOG_ALL
+};
+void tep_set_loglevel(enum tep_loglevel level);
+
+/*
+ * Part of the KVM plugin. Will pass the current @event and @record
+ * as well as a pointer to the address to a guest kernel function.
+ * This is currently a weak function defined in the KVM plugin and
+ * should never be called. But a tool can override it, and this will
+ * be called when the kvm plugin has an address it needs the function
+ * name of.
+ *
+ * This function should return the function name for the given address
+ * and optionally, it can update @paddr to include the start of the function
+ * such that the kvm plugin can include an offset.
+ *
+ * For an application to be able to override the weak version in the
+ * plugin, it must be compiled with the gcc -rdynamic option that will
+ * allow the dynamic linker to use the application's function to
+ * override this callback.
+ */
+const char *tep_plugin_kvm_get_func(struct tep_event *event,
+				    struct tep_record *record,
+				    unsigned long long *paddr);
+
+/*
+ * tep_plugin_kvm_put_func() is another weak function that can be used
+ * to call back into the application if the function name returned by
+ * tep_plugin_kvm_get_func() needs to be freed.
+ */
+void tep_plugin_kvm_put_func(const char *func);
+
+/* DEPRECATED */
+void tep_print_field(struct trace_seq *s, void *data,
+		     struct tep_format_field *field);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _PARSE_EVENTS_H */
diff --git a/include/traceevent/event-utils.h b/include/traceevent/event-utils.h
new file mode 100644
index 0000000..44f7968
--- /dev/null
+++ b/include/traceevent/event-utils.h
@@ -0,0 +1,80 @@
+/* SPDX-License-Identifier: LGPL-2.1 */
+/*
+ * Copyright (C) 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ *
+ */
+#ifndef __TEP_EVENT_UTIL_H
+#define __TEP_EVENT_UTIL_H
+
+#include <ctype.h>
+#include <stdarg.h>
+#include <stdbool.h>
+
+#include "event-parse.h"
+
+void tep_warning(const char *fmt, ...);
+void tep_info(const char *fmt, ...);
+
+/* Can be overridden */
+int tep_vprint(const char *name, enum tep_loglevel level,
+	       bool print_err, const char *fmt, va_list ap);
+
+/* The actual call of tep_vprint() for overrides to use */
+int __tep_vprint(const char *name, enum tep_loglevel level,
+		 bool print_err, const char *fmt, va_list ap);
+
+
+#define __deprecated(msg) __attribute__((deprecated("msg")))
+
+/* For backward compatibilty, do not use */
+int tep_vwarning(const char *name, const char *fmt, va_list ap) __deprecated(Use tep_vprint instead);
+void pr_stat(const char *fmt, ...) __deprecated(Use tep_info instead);
+void vpr_stat(const char *fmt, va_list ap) __deprecated(Use tep_vprint instead);
+void __pr_stat(const char *fmt, ...) __deprecated(Use tep_info instead);;
+void __vpr_stat(const char *fmt, va_list ap) __deprecated(Use tep_vprint instead);;
+
+#define min(x, y) ({				\
+	typeof(x) _min1 = (x);			\
+	typeof(y) _min2 = (y);			\
+	(void) (&_min1 == &_min2);		\
+	_min1 < _min2 ? _min1 : _min2; })
+
+static inline char *strim(char *string)
+{
+	char *ret;
+
+	if (!string)
+		return NULL;
+	while (*string) {
+		if (!isspace(*string))
+			break;
+		string++;
+	}
+	ret = string;
+
+	string = ret + strlen(ret) - 1;
+	while (string > ret) {
+		if (!isspace(*string))
+			break;
+		string--;
+	}
+	string[1] = 0;
+
+	return ret;
+}
+
+static inline int has_text(const char *text)
+{
+	if (!text)
+		return 0;
+
+	while (*text) {
+		if (!isspace(*text))
+			return 1;
+		text++;
+	}
+
+	return 0;
+}
+
+#endif
diff --git a/include/traceevent/kbuffer.h b/include/traceevent/kbuffer.h
new file mode 100644
index 0000000..ca638bc
--- /dev/null
+++ b/include/traceevent/kbuffer.h
@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: LGPL-2.1 */
+/*
+ * Copyright (C) 2012 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ *
+ */
+#ifndef _KBUFFER_H
+#define _KBUFFER_H
+
+#ifndef TS_SHIFT
+#define TS_SHIFT		27
+#endif
+
+enum kbuffer_endian {
+	KBUFFER_ENDIAN_BIG,
+	KBUFFER_ENDIAN_LITTLE,
+	KBUFFER_ENDIAN_SAME_AS_HOST,
+};
+
+enum kbuffer_long_size {
+	KBUFFER_LSIZE_4,
+	KBUFFER_LSIZE_8,
+	KBUFFER_LSIZE_SAME_AS_HOST,
+};
+
+enum {
+	KBUFFER_TYPE_PADDING		= 29,
+	KBUFFER_TYPE_TIME_EXTEND	= 30,
+	KBUFFER_TYPE_TIME_STAMP		= 31,
+};
+
+struct kbuffer;
+
+struct kbuffer *kbuffer_alloc(enum kbuffer_long_size size, enum kbuffer_endian endian);
+void kbuffer_free(struct kbuffer *kbuf);
+int kbuffer_load_subbuffer(struct kbuffer *kbuf, void *subbuffer);
+void *kbuffer_read_event(struct kbuffer *kbuf, unsigned long long *ts);
+void *kbuffer_next_event(struct kbuffer *kbuf, unsigned long long *ts);
+unsigned long long kbuffer_timestamp(struct kbuffer *kbuf);
+unsigned long long kbuffer_subbuf_timestamp(struct kbuffer *kbuf, void *subbuf);
+unsigned int kbuffer_ptr_delta(struct kbuffer *kbuf, void *ptr);
+
+void *kbuffer_translate_data(int swap, void *data, unsigned int *size);
+
+void *kbuffer_read_at_offset(struct kbuffer *kbuf, int offset, unsigned long long *ts);
+
+int kbuffer_curr_index(struct kbuffer *kbuf);
+
+int kbuffer_curr_offset(struct kbuffer *kbuf);
+int kbuffer_curr_size(struct kbuffer *kbuf);
+int kbuffer_event_size(struct kbuffer *kbuf);
+int kbuffer_missed_events(struct kbuffer *kbuf);
+int kbuffer_subbuffer_size(struct kbuffer *kbuf);
+
+void kbuffer_set_old_format(struct kbuffer *kbuf);
+int kbuffer_start_of_data(struct kbuffer *kbuf);
+
+/* Debugging */
+
+struct kbuffer_raw_info {
+	int			type;
+	int			length;
+	unsigned long long	delta;
+	void			*next;
+};
+
+/* Read raw data */
+struct kbuffer_raw_info *kbuffer_raw_get(struct kbuffer *kbuf, void *subbuf,
+					 struct kbuffer_raw_info *info);
+
+#endif /* _K_BUFFER_H */
diff --git a/include/traceevent/trace-seq.h b/include/traceevent/trace-seq.h
new file mode 100644
index 0000000..217492f
--- /dev/null
+++ b/include/traceevent/trace-seq.h
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ *
+ */
+
+#ifndef _TRACE_SEQ_H
+#define _TRACE_SEQ_H
+
+#include <stdarg.h>
+#include <stdio.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* ----------------------- trace_seq ----------------------- */
+
+#ifndef TRACE_SEQ_BUF_SIZE
+#define TRACE_SEQ_BUF_SIZE 4096
+#endif
+
+enum trace_seq_fail {
+	TRACE_SEQ__GOOD,
+	TRACE_SEQ__BUFFER_POISONED,
+	TRACE_SEQ__MEM_ALLOC_FAILED,
+};
+
+/*
+ * Trace sequences are used to allow a function to call several other functions
+ * to create a string of data to use (up to a max of PAGE_SIZE).
+ */
+
+struct trace_seq {
+	char			*buffer;
+	unsigned int		buffer_size;
+	unsigned int		len;
+	unsigned int		readpos;
+	enum trace_seq_fail	state;
+};
+
+void trace_seq_init(struct trace_seq *s);
+void trace_seq_reset(struct trace_seq *s);
+void trace_seq_destroy(struct trace_seq *s);
+
+extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
+	__attribute__ ((format (printf, 2, 3)));
+extern int trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
+	__attribute__ ((format (printf, 2, 0)));
+
+extern int trace_seq_puts(struct trace_seq *s, const char *str);
+extern int trace_seq_putc(struct trace_seq *s, unsigned char c);
+
+extern void trace_seq_terminate(struct trace_seq *s);
+
+extern int trace_seq_do_fprintf(struct trace_seq *s, FILE *fp);
+extern int trace_seq_do_printf(struct trace_seq *s);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _TRACE_SEQ_H */
diff --git a/libtraceevent.pc.template b/libtraceevent.pc.template
new file mode 100644
index 0000000..1ab046f
--- /dev/null
+++ b/libtraceevent.pc.template
@@ -0,0 +1,10 @@
+prefix=INSTALL_PREFIX
+libdir=${prefix}/LIB_DIR
+includedir=${prefix}/HEADER_DIR
+
+Name: libtraceevent
+URL: https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
+Description: Linux kernel trace event library
+Version: LIB_VERSION
+Cflags: -I${includedir}
+Libs: -L${libdir} -ltraceevent
diff --git a/plugins/Build b/plugins/Build
new file mode 100644
index 0000000..dd4da82
--- /dev/null
+++ b/plugins/Build
@@ -0,0 +1,12 @@
+plugin_jbd2-y         += plugin_jbd2.o
+plugin_hrtimer-y      += plugin_hrtimer.o
+plugin_kmem-y         += plugin_kmem.o
+plugin_kvm-y          += plugin_kvm.o
+plugin_mac80211-y     += plugin_mac80211.o
+plugin_sched_switch-y += plugin_sched_switch.o
+plugin_function-y     += plugin_function.o
+plugin_futex-y        += plugin_futex.o
+plugin_xen-y          += plugin_xen.o
+plugin_scsi-y         += plugin_scsi.o
+plugin_cfg80211-y     += plugin_cfg80211.o
+plugin_tlb-y          += plugin_tlb.o
\ No newline at end of file
diff --git a/plugins/Makefile b/plugins/Makefile
new file mode 100644
index 0000000..4c8cb17
--- /dev/null
+++ b/plugins/Makefile
@@ -0,0 +1,166 @@
+# SPDX-License-Identifier: GPL-2.0
+
+#MAKEFLAGS += --no-print-directory
+
+
+# Makefiles suck: This macro sets a default value of $(2) for the
+# variable named by $(1), unless the variable has been set by
+# environment or command line. This is necessary for CC and AR
+# because make sets default values, so the simpler ?= approach
+# won't work as expected.
+define allow-override
+  $(if $(or $(findstring environment,$(origin $(1))),\
+            $(findstring command line,$(origin $(1)))),,\
+    $(eval $(1) = $(2)))
+endef
+
+# Allow setting CC and AR, or setting CROSS_COMPILE as a prefix.
+$(call allow-override,CC,$(CROSS_COMPILE)gcc)
+$(call allow-override,AR,$(CROSS_COMPILE)ar)
+$(call allow-override,NM,$(CROSS_COMPILE)nm)
+$(call allow-override,PKG_CONFIG,pkg-config)
+
+EXT = -std=gnu99
+INSTALL = install
+
+# Use DESTDIR for installing into a different root directory.
+# This is useful for building a package. The program will be
+# installed in this directory as if it was the root directory.
+# Then the build tool can move it later.
+DESTDIR ?=
+DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
+
+LP64 := $(shell echo __LP64__ | ${CC} ${CFLAGS} -E -x c - | tail -n 1)
+ifeq ($(LP64), 1)
+  libdir_relative_tmp = lib64
+else
+  libdir_relative_tmp = lib
+endif
+
+libdir_relative ?= $(libdir_relative_tmp)
+prefix ?= /usr/local
+libdir = $(prefix)/$(libdir_relative)
+
+include ../scripts/utils.mk
+
+# copy a bit from Linux kbuild
+
+ifeq ("$(origin V)", "command line")
+  VERBOSE = $(V)
+endif
+ifndef VERBOSE
+  VERBOSE = 0
+endif
+
+# Shell quotes
+plugin_dir_SQ = $(subst ','\'',$(plugin_dir))
+
+CONFIG_INCLUDES =
+CONFIG_LIBS    =
+CONFIG_FLAGS   =
+
+OBJ            = $@
+N              =
+
+INCLUDES = -I. -I.. -I../src -I $(srctree)/include -I $(EP_HEADERS_DIR) $(CONFIG_INCLUDES)
+
+# Set compile option CFLAGS
+ifdef EXTRA_CFLAGS
+  CFLAGS := $(EXTRA_CFLAGS)
+else
+  CFLAGS := -g -Wall
+endif
+
+# Append required CFLAGS
+override CFLAGS += -fPIC
+override CFLAGS += $(CONFIG_FLAGS) $(INCLUDES) $(PLUGIN_DIR_SQ)
+override CFLAGS += $(udis86-flags) -D_GNU_SOURCE
+
+ifeq ($(VERBOSE),1)
+  Q =
+else
+  Q = @
+endif
+
+export srctree OUTPUT CC LD CFLAGS V
+
+DYNAMIC_LIST_FILE := $(bdir)/libtraceevent-dynamic-list
+
+PLUGINS  = plugin_jbd2.so
+PLUGINS += plugin_hrtimer.so
+PLUGINS += plugin_kmem.so
+PLUGINS += plugin_kvm.so
+PLUGINS += plugin_mac80211.so
+PLUGINS += plugin_sched_switch.so
+PLUGINS += plugin_function.so
+PLUGINS += plugin_futex.so
+PLUGINS += plugin_xen.so
+PLUGINS += plugin_scsi.so
+PLUGINS += plugin_cfg80211.so
+PLUGINS += plugin_tlb.so
+
+PLUGINS := $(PLUGINS:%.so=$(bdir)/%.so)
+DEPS := $(PLUGINS:$(bdir)/%.so=$(bdir)/.%.d)
+
+plugins: $(PLUGINS) $(DYNAMIC_LIST_FILE)
+
+$(PLUGINS): | $(bdir)
+$(DEPS): | $(bdir)
+
+$(bdir)/%.so: $(srctree)/plugins/%.c
+	$(Q)$(call do_plugin_build)
+
+define update_dir
+  (echo $1 > $@.tmp;                           \
+   if [ -r $@ ] && cmp -s $@ $@.tmp; then      \
+     rm -f $@.tmp;                             \
+   else                                                \
+     echo '  UPDATE                 $@';       \
+     mv -f $@.tmp $@;                          \
+   fi);
+endef
+
+tags:	force
+	$(RM) tags
+	find . -name '*.[ch]' | xargs ctags --extra=+f --c-kinds=+px \
+	--regex-c++='/_PE\(([^,)]*).*/TEP_ERRNO__\1/'
+
+TAGS:	force
+	$(RM) TAGS
+	find . -name '*.[ch]' | xargs etags \
+	--regex='/_PE(\([^,)]*\).*/TEP_ERRNO__\1/'
+
+define do_install_plugins
+       for plugin in $1; do                            \
+         $(call do_install,$$plugin,$(plugin_dir_SQ)); \
+       done
+endef
+
+define do_generate_dynamic_list_file
+	symbol_type=`$(NM) -u -D $1 | awk 'NF>1 {print $$1}' | \
+	xargs echo "U w W" | tr 'w ' 'W\n' | sort -u | xargs echo`;\
+	if [ "$$symbol_type" = "U W" ];then				\
+		(echo '{';                                              \
+		$(NM) -u -D $1 | awk 'NF>1 {sub("@.*", "", $$2); print "\t"$$2";"}' | sort -u;\
+		echo '};';                                              \
+		) > $2;                                                 \
+	else                                                            \
+		(echo Either missing one of [$1] or bad version of $(NM)) 1>&2;\
+		fi
+endef
+
+$(DYNAMIC_LIST_FILE): $(PLUGINS)
+	$(Q)($(print_gen)$(call do_generate_dynamic_list_file, $(PLUGINS), $@))
+
+install: $(PLUGINS)
+	$(Q)$(call do_install_plugins, $(PLUGINS))
+
+clean:
+	$(Q)$(call do_clean, $(DYNAMIC_LIST_FILE) $(PLUGINS))
+
+PHONY += force plugins $(DYNAMIC_LIST_FILE)
+force:
+
+# Declare the contents of the .PHONY variable as phony.  We keep that
+# information in a variable so we can use it in if_changed and friends.
+.PHONY: $(PHONY)
diff --git a/plugins/plugin_cfg80211.c b/plugins/plugin_cfg80211.c
new file mode 100644
index 0000000..3d43b56
--- /dev/null
+++ b/plugins/plugin_cfg80211.c
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+#include <endian.h>
+#include "event-parse.h"
+
+/*
+ * From glibc endian.h, for older systems where it is not present, e.g.: RHEL5,
+ * Fedora6.
+ */
+#ifndef le16toh
+# if __BYTE_ORDER == __LITTLE_ENDIAN
+#  define le16toh(x) (x)
+# else
+#  define le16toh(x) __bswap_16 (x)
+# endif
+#endif
+
+
+static unsigned long long
+process___le16_to_cpup(struct trace_seq *s, unsigned long long *args)
+{
+	uint16_t *val = (uint16_t *) (unsigned long) args[0];
+	return val ? (long long) le16toh(*val) : 0;
+}
+
+int TEP_PLUGIN_LOADER(struct tep_handle *tep)
+{
+	tep_register_print_function(tep,
+				    process___le16_to_cpup,
+				    TEP_FUNC_ARG_INT,
+				    "__le16_to_cpup",
+				    TEP_FUNC_ARG_PTR,
+				    TEP_FUNC_ARG_VOID);
+	return 0;
+}
+
+void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
+{
+	tep_unregister_print_function(tep, process___le16_to_cpup,
+				      "__le16_to_cpup");
+}
diff --git a/plugins/plugin_function.c b/plugins/plugin_function.c
new file mode 100644
index 0000000..2d6509b
--- /dev/null
+++ b/plugins/plugin_function.c
@@ -0,0 +1,322 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "event-parse.h"
+#include "event-utils.h"
+#include "trace-seq.h"
+
+#define __weak __attribute__((weak))
+
+/* Export this for applications to override it */
+__weak const char *tep_func_repeat_format = "%6.1000d";
+
+static struct func_stack {
+	int size;
+	char **stack;
+} *fstack;
+
+static int cpus = -1;
+
+#define STK_BLK 10
+
+struct tep_plugin_option plugin_options[] =
+{
+	{
+		.name = "parent",
+		.plugin_alias = "ftrace",
+		.description =
+		"Print parent of functions for function events",
+	},
+	{
+		.name = "indent",
+		.plugin_alias = "ftrace",
+		.description =
+		"Try to show function call indents, based on parents",
+		.set = 1,
+	},
+	{
+		.name = "offset",
+		.plugin_alias = "ftrace",
+		.description =
+		"Show function names as well as their offsets",
+		.set = 0,
+	},
+	{
+		.name = NULL,
+	}
+};
+
+static struct tep_plugin_option *ftrace_parent = &plugin_options[0];
+static struct tep_plugin_option *ftrace_indent = &plugin_options[1];
+static struct tep_plugin_option *ftrace_offset = &plugin_options[2];
+
+static void add_child(struct func_stack *stack, const char *child, int pos)
+{
+	int i;
+
+	if (!child)
+		return;
+
+	if (pos < stack->size)
+		free(stack->stack[pos]);
+	else {
+		char **ptr;
+
+		ptr = realloc(stack->stack, sizeof(char *) *
+			      (stack->size + STK_BLK));
+		if (!ptr) {
+			tep_warning("could not allocate plugin memory\n");
+			return;
+		}
+
+		stack->stack = ptr;
+
+		for (i = stack->size; i < stack->size + STK_BLK; i++)
+			stack->stack[i] = NULL;
+		stack->size += STK_BLK;
+	}
+
+	stack->stack[pos] = strdup(child);
+}
+
+static int add_and_get_index(const char *parent, const char *child, int cpu)
+{
+	int i;
+
+	if (cpu < 0)
+		return 0;
+
+	if (cpu > cpus) {
+		struct func_stack *ptr;
+
+		ptr = realloc(fstack, sizeof(*fstack) * (cpu + 1));
+		if (!ptr) {
+			tep_warning("could not allocate plugin memory\n");
+			return 0;
+		}
+
+		fstack = ptr;
+
+		/* Account for holes in the cpu count */
+		for (i = cpus + 1; i <= cpu; i++)
+			memset(&fstack[i], 0, sizeof(fstack[i]));
+		cpus = cpu;
+	}
+
+	for (i = 0; i < fstack[cpu].size && fstack[cpu].stack[i]; i++) {
+		if (strcmp(parent, fstack[cpu].stack[i]) == 0) {
+			add_child(&fstack[cpu], child, i+1);
+			return i;
+		}
+	}
+
+	/* Not found */
+	add_child(&fstack[cpu], parent, 0);
+	add_child(&fstack[cpu], child, 1);
+	return 0;
+}
+
+static void show_function(struct trace_seq *s, struct tep_handle *tep,
+			  const char *func, unsigned long long function)
+{
+	unsigned long long offset;
+
+	trace_seq_printf(s, "%s", func);
+	if (ftrace_offset->set) {
+		offset = tep_find_function_address(tep, function);
+		trace_seq_printf(s, "+0x%x ", (int)(function - offset));
+	}
+}
+
+static int function_handler(struct trace_seq *s, struct tep_record *record,
+			    struct tep_event *event, void *context)
+{
+	struct tep_handle *tep = event->tep;
+	unsigned long long function;
+	unsigned long long pfunction;
+	const char *func;
+	const char *parent;
+	int index = 0;
+
+	if (tep_get_field_val(s, event, "ip", record, &function, 1))
+		return trace_seq_putc(s, '!');
+
+	func = tep_find_function(tep, function);
+
+	if (tep_get_field_val(s, event, "parent_ip", record, &pfunction, 1))
+		return trace_seq_putc(s, '!');
+
+	parent = tep_find_function(tep, pfunction);
+
+	if (parent && ftrace_indent->set)
+		index = add_and_get_index(parent, func, record->cpu);
+
+	trace_seq_printf(s, "%*s", index*3, "");
+
+	if (func)
+		show_function(s, tep, func, function);
+	else
+		trace_seq_printf(s, "0x%llx", function);
+
+	if (ftrace_parent->set) {
+		trace_seq_printf(s, " <-- ");
+		if (parent)
+			show_function(s, tep, parent, pfunction);
+		else
+			trace_seq_printf(s, "0x%llx", pfunction);
+	}
+
+	return 0;
+}
+
+static int trace_func_repeat_handler(struct trace_seq *s, struct tep_record *record,
+				    struct tep_event *event, void *context)
+{
+	struct tep_handle *tep = event->tep;
+	unsigned long long count, top_delta, bottom_delta;
+	struct tep_record dummy;
+
+	function_handler(s, record, event, context);
+
+	if (tep_get_field_val(s, event, "count", record, &count, 1))
+		return trace_seq_putc(s, '!');
+
+	if (tep_get_field_val(s, event, "top_delta_ts", record, &top_delta, 1))
+		return trace_seq_putc(s, '!');
+
+	if (tep_get_field_val(s, event, "bottom_delta_ts", record, &bottom_delta, 1))
+		return trace_seq_putc(s, '!');
+
+	trace_seq_printf(s, " (count: %lld  last_ts: ", count);
+
+	memcpy(&dummy, record, sizeof(dummy));
+	dummy.ts -= (top_delta << 32) | bottom_delta;
+
+	tep_print_event(tep, s, &dummy, tep_func_repeat_format, TEP_PRINT_TIME);
+
+	trace_seq_puts(s, ")");
+
+	return 0;
+}
+
+static int
+trace_stack_handler(struct trace_seq *s, struct tep_record *record,
+		    struct tep_event *event, void *context)
+{
+	struct tep_format_field *field;
+	unsigned long long addr;
+	const char *func;
+	int long_size;
+	void *data = record->data;
+
+	field = tep_find_any_field(event, "caller");
+	if (!field) {
+		trace_seq_printf(s, "<CANT FIND FIELD %s>", "caller");
+		return 0;
+	}
+
+	trace_seq_puts(s, "<stack trace >\n");
+
+	long_size = tep_get_long_size(event->tep);
+
+	for (data += field->offset; data < record->data + record->size;
+	     data += long_size) {
+		addr = tep_read_number(event->tep, data, long_size);
+
+		if ((long_size == 8 && addr == (unsigned long long)-1) ||
+		    ((int)addr == -1))
+			break;
+
+		func = tep_find_function(event->tep, addr);
+		if (func) {
+			trace_seq_puts(s, "=> ");
+			show_function(s, event->tep, func, addr);
+			trace_seq_printf(s, " (%llx)\n", addr);
+		} else
+			trace_seq_printf(s, "=> %llx\n", addr);
+	}
+
+	return 0;
+}
+
+static int
+trace_raw_data_handler(struct trace_seq *s, struct tep_record *record,
+		    struct tep_event *event, void *context)
+{
+	struct tep_format_field *field;
+	unsigned long long id;
+	int long_size;
+	void *data = record->data;
+
+	if (tep_get_field_val(s, event, "id", record, &id, 1))
+		return trace_seq_putc(s, '!');
+
+	trace_seq_printf(s, "# %llx", id);
+
+	field = tep_find_any_field(event, "buf");
+	if (!field) {
+		trace_seq_printf(s, "<CANT FIND FIELD %s>", "buf");
+		return 0;
+	}
+
+	long_size = tep_get_long_size(event->tep);
+
+	for (data += field->offset; data < record->data + record->size;
+	     data += long_size) {
+		int size = sizeof(long);
+		int left = (record->data + record->size) - data;
+		int i;
+
+		if (size > left)
+			size = left;
+
+		for (i = 0; i < size; i++)
+			trace_seq_printf(s, " %02x", *(unsigned char *)(data + i));
+	}
+
+	return 0;
+}
+
+int TEP_PLUGIN_LOADER(struct tep_handle *tep)
+{
+	tep_register_event_handler(tep, -1, "ftrace", "function",
+				   function_handler, NULL);
+
+	tep_register_event_handler(tep, -1, "ftrace", "kernel_stack",
+				      trace_stack_handler, NULL);
+
+	tep_register_event_handler(tep, -1, "ftrace", "raw_data",
+				      trace_raw_data_handler, NULL);
+
+	tep_register_event_handler(tep, -1, "ftrace", "func_repeats",
+				      trace_func_repeat_handler, NULL);
+
+	tep_plugin_add_options("ftrace", plugin_options);
+
+	return 0;
+}
+
+void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
+{
+	int i, x;
+
+	tep_unregister_event_handler(tep, -1, "ftrace", "function",
+				     function_handler, NULL);
+
+	for (i = 0; i <= cpus; i++) {
+		for (x = 0; x < fstack[i].size && fstack[i].stack[x]; x++)
+			free(fstack[i].stack[x]);
+		free(fstack[i].stack);
+	}
+
+	tep_plugin_remove_options(plugin_options);
+
+	free(fstack);
+	fstack = NULL;
+	cpus = -1;
+}
diff --git a/plugins/plugin_futex.c b/plugins/plugin_futex.c
new file mode 100644
index 0000000..eb7c9f8
--- /dev/null
+++ b/plugins/plugin_futex.c
@@ -0,0 +1,123 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2017 National Instruments Corp.
+ *
+ * Author: Julia Cartwright <julia@ni.com>
+ *
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <linux/futex.h>
+
+#include "event-parse.h"
+
+#define ARRAY_SIZE(_a) (sizeof(_a) / sizeof((_a)[0]))
+
+struct futex_args {
+	unsigned long long	uaddr;
+	unsigned long long	op;
+	unsigned long long	val;
+	unsigned long long	utime; /* or val2 */
+	unsigned long long	uaddr2;
+	unsigned long long	val3;
+};
+
+struct futex_op {
+	const char	*name;
+	const char	*fmt_val;
+	const char	*fmt_utime;
+	const char	*fmt_uaddr2;
+	const char	*fmt_val3;
+};
+
+static const struct futex_op futex_op_tbl[] = {
+	{            "FUTEX_WAIT", " val=0x%08llx", " utime=0x%08llx",               NULL,             NULL },
+	{            "FUTEX_WAKE",     " val=%llu",              NULL,               NULL,             NULL },
+	{              "FUTEX_FD",     " val=%llu",              NULL,               NULL,             NULL },
+	{         "FUTEX_REQUEUE",     " val=%llu",      " val2=%llu", " uaddr2=0x%08llx",             NULL },
+	{     "FUTEX_CMP_REQUEUE",     " val=%llu",      " val2=%llu", " uaddr2=0x%08llx", " val3=0x%08llx" },
+	{         "FUTEX_WAKE_OP",     " val=%llu",      " val2=%llu", " uaddr2=0x%08llx", " val3=0x%08llx" },
+	{         "FUTEX_LOCK_PI",            NULL, " utime=0x%08llx",               NULL,             NULL },
+	{       "FUTEX_UNLOCK_PI",            NULL,              NULL,               NULL,             NULL },
+	{      "FUTEX_TRYLOCK_PI",            NULL,              NULL,               NULL,             NULL },
+	{     "FUTEX_WAIT_BITSET", " val=0x%08llx", " utime=0x%08llx",               NULL, " val3=0x%08llx" },
+	{     "FUTEX_WAKE_BITSET",     " val=%llu",              NULL,               NULL, " val3=0x%08llx" },
+	{ "FUTEX_WAIT_REQUEUE_PI", " val=0x%08llx", " utime=0x%08llx", " uaddr2=0x%08llx", " val3=0x%08llx" },
+	{  "FUTEX_CMP_REQUEUE_PI",     " val=%llu",      " val2=%llu", " uaddr2=0x%08llx", " val3=0x%08llx" },
+};
+
+
+static void futex_print(struct trace_seq *s, const struct futex_args *args,
+			const struct futex_op *fop)
+{
+	trace_seq_printf(s, " uaddr=0x%08llx", args->uaddr);
+
+	if (fop->fmt_val)
+		trace_seq_printf(s, fop->fmt_val, args->val);
+
+	if (fop->fmt_utime)
+		trace_seq_printf(s,fop->fmt_utime, args->utime);
+
+	if (fop->fmt_uaddr2)
+		trace_seq_printf(s, fop->fmt_uaddr2, args->uaddr2);
+
+	if (fop->fmt_val3)
+		trace_seq_printf(s, fop->fmt_val3, args->val3);
+}
+
+static int futex_handler(struct trace_seq *s, struct tep_record *record,
+			 struct tep_event *event, void *context)
+{
+	const struct futex_op *fop;
+	struct futex_args args;
+	unsigned long long cmd;
+
+	if (tep_get_field_val(s, event, "uaddr", record, &args.uaddr, 1))
+		return 1;
+
+	if (tep_get_field_val(s, event, "op", record, &args.op, 1))
+		return 1;
+
+	if (tep_get_field_val(s, event, "val", record, &args.val, 1))
+		return 1;
+
+	if (tep_get_field_val(s, event, "utime", record, &args.utime, 1))
+		return 1;
+
+	if (tep_get_field_val(s, event, "uaddr2", record, &args.uaddr2, 1))
+		return 1;
+
+	if (tep_get_field_val(s, event, "val3", record, &args.val3, 1))
+		return 1;
+
+	cmd = args.op & FUTEX_CMD_MASK;
+	if (cmd >= ARRAY_SIZE(futex_op_tbl))
+		return 1;
+
+	fop = &futex_op_tbl[cmd];
+
+	trace_seq_printf(s, "op=%s", fop->name);
+
+	if (args.op & FUTEX_PRIVATE_FLAG)
+		trace_seq_puts(s, "|FUTEX_PRIVATE_FLAG");
+
+	if (args.op & FUTEX_CLOCK_REALTIME)
+		trace_seq_puts(s, "|FUTEX_CLOCK_REALTIME");
+
+	futex_print(s, &args, fop);
+	return 0;
+}
+
+int TEP_PLUGIN_LOADER(struct tep_handle *tep)
+{
+	tep_register_event_handler(tep, -1, "syscalls", "sys_enter_futex",
+				   futex_handler, NULL);
+	return 0;
+}
+
+void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
+{
+	tep_unregister_event_handler(tep, -1, "syscalls", "sys_enter_futex",
+				     futex_handler, NULL);
+}
diff --git a/plugins/plugin_hrtimer.c b/plugins/plugin_hrtimer.c
new file mode 100644
index 0000000..d984667
--- /dev/null
+++ b/plugins/plugin_hrtimer.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2009 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ * Copyright (C) 2009 Johannes Berg <johannes@sipsolutions.net>
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "event-parse.h"
+#include "trace-seq.h"
+
+static int timer_expire_handler(struct trace_seq *s,
+				struct tep_record *record,
+				struct tep_event *event, void *context)
+{
+	trace_seq_printf(s, "hrtimer=");
+
+	if (tep_print_num_field(s, "0x%llx", event, "timer",
+				record, 0) == -1)
+		tep_print_num_field(s, "0x%llx", event, "hrtimer",
+				    record, 1);
+
+	trace_seq_printf(s, " now=");
+
+	tep_print_num_field(s, "%llu", event, "now", record, 1);
+
+	tep_print_func_field(s, " function=%s", event, "function",
+				record, 0);
+	return 0;
+}
+
+static int timer_start_handler(struct trace_seq *s,
+			       struct tep_record *record,
+			       struct tep_event *event, void *context)
+{
+	trace_seq_printf(s, "hrtimer=");
+
+	if (tep_print_num_field(s, "0x%llx", event, "timer",
+				record, 0) == -1)
+		tep_print_num_field(s, "0x%llx", event, "hrtimer",
+				    record, 1);
+
+	tep_print_func_field(s, " function=%s", event, "function",
+			     record, 0);
+
+	trace_seq_printf(s, " expires=");
+	tep_print_num_field(s, "%llu", event, "expires", record, 1);
+
+	trace_seq_printf(s, " softexpires=");
+	tep_print_num_field(s, "%llu", event, "softexpires", record, 1);
+	return 0;
+}
+
+int TEP_PLUGIN_LOADER(struct tep_handle *tep)
+{
+	tep_register_event_handler(tep, -1,
+				   "timer", "hrtimer_expire_entry",
+				   timer_expire_handler, NULL);
+
+	tep_register_event_handler(tep, -1, "timer", "hrtimer_start",
+				   timer_start_handler, NULL);
+	return 0;
+}
+
+void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
+{
+	tep_unregister_event_handler(tep, -1,
+				     "timer", "hrtimer_expire_entry",
+				     timer_expire_handler, NULL);
+
+	tep_unregister_event_handler(tep, -1, "timer", "hrtimer_start",
+				     timer_start_handler, NULL);
+}
diff --git a/plugins/plugin_jbd2.c b/plugins/plugin_jbd2.c
new file mode 100644
index 0000000..69111a6
--- /dev/null
+++ b/plugins/plugin_jbd2.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "event-parse.h"
+#include "trace-seq.h"
+
+#define MINORBITS	20
+#define MINORMASK	((1U << MINORBITS) - 1)
+
+#define MAJOR(dev)	((unsigned int) ((dev) >> MINORBITS))
+#define MINOR(dev)	((unsigned int) ((dev) & MINORMASK))
+
+static unsigned long long
+process_jbd2_dev_to_name(struct trace_seq *s, unsigned long long *args)
+{
+	unsigned int dev = args[0];
+
+	trace_seq_printf(s, "%d:%d", MAJOR(dev), MINOR(dev));
+	return 0;
+}
+
+static unsigned long long
+process_jiffies_to_msecs(struct trace_seq *s, unsigned long long *args)
+{
+	unsigned long long jiffies = args[0];
+
+	trace_seq_printf(s, "%lld", jiffies);
+	return jiffies;
+}
+
+int TEP_PLUGIN_LOADER(struct tep_handle *tep)
+{
+	tep_register_print_function(tep,
+				    process_jbd2_dev_to_name,
+				    TEP_FUNC_ARG_STRING,
+				    "jbd2_dev_to_name",
+				    TEP_FUNC_ARG_INT,
+				    TEP_FUNC_ARG_VOID);
+
+	tep_register_print_function(tep,
+				    process_jiffies_to_msecs,
+				    TEP_FUNC_ARG_LONG,
+				    "jiffies_to_msecs",
+				    TEP_FUNC_ARG_LONG,
+				    TEP_FUNC_ARG_VOID);
+	return 0;
+}
+
+void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
+{
+	tep_unregister_print_function(tep, process_jbd2_dev_to_name,
+				      "jbd2_dev_to_name");
+
+	tep_unregister_print_function(tep, process_jiffies_to_msecs,
+				      "jiffies_to_msecs");
+}
diff --git a/plugins/plugin_kmem.c b/plugins/plugin_kmem.c
new file mode 100644
index 0000000..4b4f7f9
--- /dev/null
+++ b/plugins/plugin_kmem.c
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2009 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "event-parse.h"
+#include "trace-seq.h"
+
+static int call_site_handler(struct trace_seq *s, struct tep_record *record,
+			     struct tep_event *event, void *context)
+{
+	struct tep_format_field *field;
+	unsigned long long val, addr;
+	void *data = record->data;
+	const char *func;
+
+	field = tep_find_field(event, "call_site");
+	if (!field)
+		return 1;
+
+	if (tep_read_number_field(field, data, &val))
+		return 1;
+
+	func = tep_find_function(event->tep, val);
+	if (!func)
+		return 1;
+
+	addr = tep_find_function_address(event->tep, val);
+
+	trace_seq_printf(s, "(%s+0x%x) ", func, (int)(val - addr));
+	return 1;
+}
+
+int TEP_PLUGIN_LOADER(struct tep_handle *tep)
+{
+	tep_register_event_handler(tep, -1, "kmem", "kfree",
+				   call_site_handler, NULL);
+
+	tep_register_event_handler(tep, -1, "kmem", "kmalloc",
+				   call_site_handler, NULL);
+
+	tep_register_event_handler(tep, -1, "kmem", "kmalloc_node",
+				   call_site_handler, NULL);
+
+	tep_register_event_handler(tep, -1, "kmem", "kmem_cache_alloc",
+				   call_site_handler, NULL);
+
+	tep_register_event_handler(tep, -1, "kmem",
+				   "kmem_cache_alloc_node",
+				   call_site_handler, NULL);
+
+	tep_register_event_handler(tep, -1, "kmem", "kmem_cache_free",
+				   call_site_handler, NULL);
+	return 0;
+}
+
+void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
+{
+	tep_unregister_event_handler(tep, -1, "kmem", "kfree",
+				     call_site_handler, NULL);
+
+	tep_unregister_event_handler(tep, -1, "kmem", "kmalloc",
+				     call_site_handler, NULL);
+
+	tep_unregister_event_handler(tep, -1, "kmem", "kmalloc_node",
+				     call_site_handler, NULL);
+
+	tep_unregister_event_handler(tep, -1, "kmem", "kmem_cache_alloc",
+				     call_site_handler, NULL);
+
+	tep_unregister_event_handler(tep, -1, "kmem",
+				     "kmem_cache_alloc_node",
+				     call_site_handler, NULL);
+
+	tep_unregister_event_handler(tep, -1, "kmem", "kmem_cache_free",
+				     call_site_handler, NULL);
+}
diff --git a/plugins/plugin_kvm.c b/plugins/plugin_kvm.c
new file mode 100644
index 0000000..9852c35
--- /dev/null
+++ b/plugins/plugin_kvm.c
@@ -0,0 +1,591 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2009 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+
+#include "event-parse.h"
+#include "trace-seq.h"
+
+#define __weak __attribute__((weak))
+
+#ifdef HAVE_UDIS86
+
+#include <udis86.h>
+
+static ud_t ud;
+
+static void init_disassembler(void)
+{
+	ud_init(&ud);
+	ud_set_syntax(&ud, UD_SYN_ATT);
+}
+
+static const char *disassemble(unsigned char *insn, int len, uint64_t rip,
+			       int cr0_pe, int eflags_vm,
+			       int cs_d, int cs_l)
+{
+	int mode;
+
+	if (!cr0_pe)
+		mode = 16;
+	else if (eflags_vm)
+		mode = 16;
+	else if (cs_l)
+		mode = 64;
+	else if (cs_d)
+		mode = 32;
+	else
+		mode = 16;
+
+	ud_set_pc(&ud, rip);
+	ud_set_mode(&ud, mode);
+	ud_set_input_buffer(&ud, insn, len);
+	ud_disassemble(&ud);
+	return ud_insn_asm(&ud);
+}
+
+#else
+
+static void init_disassembler(void)
+{
+}
+
+static const char *disassemble(unsigned char *insn, int len, uint64_t rip,
+			       int cr0_pe, int eflags_vm,
+			       int cs_d, int cs_l)
+{
+	static char out[15*3+1];
+	int i;
+
+	for (i = 0; i < len; ++i)
+		sprintf(out + i * 3, "%02x ", insn[i]);
+	out[len*3-1] = '\0';
+	return out;
+}
+
+#endif
+
+
+#define VMX_EXIT_REASONS			\
+	_ER(EXCEPTION_NMI,	 0)		\
+	_ER(EXTERNAL_INTERRUPT,	 1)		\
+	_ER(TRIPLE_FAULT,	 2)		\
+	_ER(PENDING_INTERRUPT,	 7)		\
+	_ER(NMI_WINDOW,		 8)		\
+	_ER(TASK_SWITCH,	 9)		\
+	_ER(CPUID,		 10)		\
+	_ER(HLT,		 12)		\
+	_ER(INVD,		 13)		\
+	_ER(INVLPG,		 14)		\
+	_ER(RDPMC,		 15)		\
+	_ER(RDTSC,		 16)		\
+	_ER(VMCALL,		 18)		\
+	_ER(VMCLEAR,		 19)		\
+	_ER(VMLAUNCH,		 20)		\
+	_ER(VMPTRLD,		 21)		\
+	_ER(VMPTRST,		 22)		\
+	_ER(VMREAD,		 23)		\
+	_ER(VMRESUME,		 24)		\
+	_ER(VMWRITE,		 25)		\
+	_ER(VMOFF,		 26)		\
+	_ER(VMON,		 27)		\
+	_ER(CR_ACCESS,		 28)		\
+	_ER(DR_ACCESS,		 29)		\
+	_ER(IO_INSTRUCTION,	 30)		\
+	_ER(MSR_READ,		 31)		\
+	_ER(MSR_WRITE,		 32)		\
+	_ER(MWAIT_INSTRUCTION,	 36)		\
+	_ER(MONITOR_INSTRUCTION, 39)		\
+	_ER(PAUSE_INSTRUCTION,	 40)		\
+	_ER(MCE_DURING_VMENTRY,	 41)		\
+	_ER(TPR_BELOW_THRESHOLD, 43)		\
+	_ER(APIC_ACCESS,	 44)		\
+	_ER(EOI_INDUCED,	 45)		\
+	_ER(EPT_VIOLATION,	 48)		\
+	_ER(EPT_MISCONFIG,	 49)		\
+	_ER(INVEPT,		 50)		\
+	_ER(PREEMPTION_TIMER,	 52)		\
+	_ER(WBINVD,		 54)		\
+	_ER(XSETBV,		 55)		\
+	_ER(APIC_WRITE,		 56)		\
+	_ER(INVPCID,		 58)		\
+	_ER(PML_FULL,		 62)		\
+	_ER(XSAVES,		 63)		\
+	_ER(XRSTORS,		 64)
+
+#define SVM_EXIT_REASONS \
+	_ER(EXIT_READ_CR0,	0x000)		\
+	_ER(EXIT_READ_CR3,	0x003)		\
+	_ER(EXIT_READ_CR4,	0x004)		\
+	_ER(EXIT_READ_CR8,	0x008)		\
+	_ER(EXIT_WRITE_CR0,	0x010)		\
+	_ER(EXIT_WRITE_CR3,	0x013)		\
+	_ER(EXIT_WRITE_CR4,	0x014)		\
+	_ER(EXIT_WRITE_CR8,	0x018)		\
+	_ER(EXIT_READ_DR0,	0x020)		\
+	_ER(EXIT_READ_DR1,	0x021)		\
+	_ER(EXIT_READ_DR2,	0x022)		\
+	_ER(EXIT_READ_DR3,	0x023)		\
+	_ER(EXIT_READ_DR4,	0x024)		\
+	_ER(EXIT_READ_DR5,	0x025)		\
+	_ER(EXIT_READ_DR6,	0x026)		\
+	_ER(EXIT_READ_DR7,	0x027)		\
+	_ER(EXIT_WRITE_DR0,	0x030)		\
+	_ER(EXIT_WRITE_DR1,	0x031)		\
+	_ER(EXIT_WRITE_DR2,	0x032)		\
+	_ER(EXIT_WRITE_DR3,	0x033)		\
+	_ER(EXIT_WRITE_DR4,	0x034)		\
+	_ER(EXIT_WRITE_DR5,	0x035)		\
+	_ER(EXIT_WRITE_DR6,	0x036)		\
+	_ER(EXIT_WRITE_DR7,	0x037)		\
+	_ER(EXIT_EXCP_DE,	0x040)		\
+	_ER(EXIT_EXCP_DB,	0x041)		\
+	_ER(EXIT_EXCP_BP,	0x043)		\
+	_ER(EXIT_EXCP_OF,	0x044)		\
+	_ER(EXIT_EXCP_BR,	0x045)		\
+	_ER(EXIT_EXCP_UD,	0x046)		\
+	_ER(EXIT_EXCP_NM,	0x047)		\
+	_ER(EXIT_EXCP_DF,	0x048)		\
+	_ER(EXIT_EXCP_TS,	0x04a)		\
+	_ER(EXIT_EXCP_NP,	0x04b)		\
+	_ER(EXIT_EXCP_SS,	0x04c)		\
+	_ER(EXIT_EXCP_GP,	0x04d)		\
+	_ER(EXIT_EXCP_PF,	0x04e)		\
+	_ER(EXIT_EXCP_MF,	0x050)		\
+	_ER(EXIT_EXCP_AC,	0x051)		\
+	_ER(EXIT_EXCP_MC,	0x052)		\
+	_ER(EXIT_EXCP_XF,	0x053)		\
+	_ER(EXIT_INTR,		0x060)		\
+	_ER(EXIT_NMI,		0x061)		\
+	_ER(EXIT_SMI,		0x062)		\
+	_ER(EXIT_INIT,		0x063)		\
+	_ER(EXIT_VINTR,		0x064)		\
+	_ER(EXIT_CR0_SEL_WRITE,	0x065)		\
+	_ER(EXIT_IDTR_READ,	0x066)		\
+	_ER(EXIT_GDTR_READ,	0x067)		\
+	_ER(EXIT_LDTR_READ,	0x068)		\
+	_ER(EXIT_TR_READ,	0x069)		\
+	_ER(EXIT_IDTR_WRITE,	0x06a)		\
+	_ER(EXIT_GDTR_WRITE,	0x06b)		\
+	_ER(EXIT_LDTR_WRITE,	0x06c)		\
+	_ER(EXIT_TR_WRITE,	0x06d)		\
+	_ER(EXIT_RDTSC,		0x06e)		\
+	_ER(EXIT_RDPMC,		0x06f)		\
+	_ER(EXIT_PUSHF,		0x070)		\
+	_ER(EXIT_POPF,		0x071)		\
+	_ER(EXIT_CPUID,		0x072)		\
+	_ER(EXIT_RSM,		0x073)		\
+	_ER(EXIT_IRET,		0x074)		\
+	_ER(EXIT_SWINT,		0x075)		\
+	_ER(EXIT_INVD,		0x076)		\
+	_ER(EXIT_PAUSE,		0x077)		\
+	_ER(EXIT_HLT,		0x078)		\
+	_ER(EXIT_INVLPG,	0x079)		\
+	_ER(EXIT_INVLPGA,	0x07a)		\
+	_ER(EXIT_IOIO,		0x07b)		\
+	_ER(EXIT_MSR,		0x07c)		\
+	_ER(EXIT_TASK_SWITCH,	0x07d)		\
+	_ER(EXIT_FERR_FREEZE,	0x07e)		\
+	_ER(EXIT_SHUTDOWN,	0x07f)		\
+	_ER(EXIT_VMRUN,		0x080)		\
+	_ER(EXIT_VMMCALL,	0x081)		\
+	_ER(EXIT_VMLOAD,	0x082)		\
+	_ER(EXIT_VMSAVE,	0x083)		\
+	_ER(EXIT_STGI,		0x084)		\
+	_ER(EXIT_CLGI,		0x085)		\
+	_ER(EXIT_SKINIT,	0x086)		\
+	_ER(EXIT_RDTSCP,	0x087)		\
+	_ER(EXIT_ICEBP,		0x088)		\
+	_ER(EXIT_WBINVD,	0x089)		\
+	_ER(EXIT_MONITOR,	0x08a)		\
+	_ER(EXIT_MWAIT,		0x08b)		\
+	_ER(EXIT_MWAIT_COND,	0x08c)		\
+	_ER(EXIT_XSETBV,	0x08d)		\
+	_ER(EXIT_NPF, 		0x400)		\
+	_ER(EXIT_AVIC_INCOMPLETE_IPI,		0x401)	\
+	_ER(EXIT_AVIC_UNACCELERATED_ACCESS,	0x402)	\
+	_ER(EXIT_ERR,		-1)
+
+#define _ER(reason, val)	{ #reason, val },
+struct str_values {
+	const char	*str;
+	int		val;
+};
+
+static struct str_values vmx_exit_reasons[] = {
+	VMX_EXIT_REASONS
+	{ NULL, -1}
+};
+
+static struct str_values svm_exit_reasons[] = {
+	SVM_EXIT_REASONS
+	{ NULL, -1}
+};
+
+static struct isa_exit_reasons {
+	unsigned isa;
+	struct str_values *strings;
+} isa_exit_reasons[] = {
+	{ .isa = 1, .strings = vmx_exit_reasons },
+	{ .isa = 2, .strings = svm_exit_reasons },
+	{ }
+};
+
+static const char *find_exit_reason(unsigned isa, int val)
+{
+	struct str_values *strings = NULL;
+	int i;
+
+	for (i = 0; isa_exit_reasons[i].strings; ++i)
+		if (isa_exit_reasons[i].isa == isa) {
+			strings = isa_exit_reasons[i].strings;
+			break;
+		}
+	if (!strings)
+		return "UNKNOWN-ISA";
+	for (i = 0; strings[i].str; i++)
+		if (strings[i].val == val)
+			break;
+
+	return strings[i].str;
+}
+
+static int print_exit_reason(struct trace_seq *s, struct tep_record *record,
+			     struct tep_event *event, const char *field)
+{
+	unsigned long long isa;
+	unsigned long long val;
+	const char *reason;
+
+	if (tep_get_field_val(s, event, field, record, &val, 1) < 0)
+		return -1;
+
+	if (tep_get_field_val(s, event, "isa", record, &isa, 0) < 0)
+		isa = 1;
+
+	reason = find_exit_reason(isa, val);
+	if (reason)
+		trace_seq_printf(s, "reason %s", reason);
+	else
+		trace_seq_printf(s, "reason UNKNOWN (%llu)", val);
+	return 0;
+}
+
+__weak const char *tep_plugin_kvm_get_func(struct tep_event *event,
+					   struct tep_record *record,
+					   unsigned long long *val)
+{
+	return NULL;
+}
+
+__weak void tep_plugin_kvm_put_func(const char *func)
+{
+}
+
+
+static void add_rip_function(struct trace_seq *s, struct tep_record *record,
+			     struct tep_event *event, unsigned long long rip)
+{
+	unsigned long long ip = rip;
+	const char *func;
+
+	func = tep_plugin_kvm_get_func(event, record, &ip);
+	if (func) {
+		trace_seq_printf(s, " %s", func);
+		/* The application may upate ip to the start of the function */
+		if (ip != rip)
+			trace_seq_printf(s, "+0x%0llx", rip - ip);
+		tep_plugin_kvm_put_func(func);
+	}
+}
+
+static int kvm_exit_handler(struct trace_seq *s, struct tep_record *record,
+			    struct tep_event *event, void *context)
+{
+	unsigned long long info1 = 0, info2 = 0;
+	unsigned long long rip;
+
+	if (print_exit_reason(s, record, event, "exit_reason") < 0)
+		return -1;
+
+	if (tep_get_field_val(s, event, "guest_rip", record, &rip, 1) < 0)
+		return -1;
+
+	trace_seq_printf(s, " rip 0x%llx", rip);
+
+	add_rip_function(s, record, event, rip);
+
+	if (tep_get_field_val(s, event, "info1", record, &info1, 0) >= 0
+	    && tep_get_field_val(s, event, "info2", record, &info2, 0) >= 0)
+		trace_seq_printf(s, " info %llx %llx", info1, info2);
+
+	return 0;
+}
+
+static int kvm_entry_handler(struct trace_seq *s, struct tep_record *record,
+			    struct tep_event *event, void *context)
+{
+	unsigned long long rip;
+
+	tep_print_num_field(s, " vcpu %u", event, "vcpu_id", record, 1);
+
+	if (tep_get_field_val(s, event, "rip", record, &rip, 1) < 0)
+		return -1;
+
+	trace_seq_printf(s, " rip 0x%llx", rip);
+	add_rip_function(s, record, event, rip);
+
+	return 0;
+}
+
+#define KVM_EMUL_INSN_F_CR0_PE (1 << 0)
+#define KVM_EMUL_INSN_F_EFL_VM (1 << 1)
+#define KVM_EMUL_INSN_F_CS_D   (1 << 2)
+#define KVM_EMUL_INSN_F_CS_L   (1 << 3)
+
+static int kvm_emulate_insn_handler(struct trace_seq *s,
+				    struct tep_record *record,
+				    struct tep_event *event, void *context)
+{
+	unsigned long long rip, csbase, len, flags, failed;
+	int llen;
+	uint8_t *insn;
+	const char *disasm;
+
+	if (tep_get_field_val(s, event, "rip", record, &rip, 1) < 0)
+		return -1;
+
+	if (tep_get_field_val(s, event, "csbase", record, &csbase, 1) < 0)
+		return -1;
+
+	if (tep_get_field_val(s, event, "len", record, &len, 1) < 0)
+		return -1;
+
+	if (tep_get_field_val(s, event, "flags", record, &flags, 1) < 0)
+		return -1;
+
+	if (tep_get_field_val(s, event, "failed", record, &failed, 1) < 0)
+		return -1;
+
+	insn = tep_get_field_raw(s, event, "insn", record, &llen, 1);
+	if (!insn)
+		return -1;
+
+	disasm = disassemble(insn, len, rip,
+			     flags & KVM_EMUL_INSN_F_CR0_PE,
+			     flags & KVM_EMUL_INSN_F_EFL_VM,
+			     flags & KVM_EMUL_INSN_F_CS_D,
+			     flags & KVM_EMUL_INSN_F_CS_L);
+
+	trace_seq_printf(s, "%llx:%llx", csbase, rip);
+	add_rip_function(s, record, event, rip);
+	trace_seq_printf(s, ": %s%s", disasm, failed ? " FAIL" : "");
+	return 0;
+}
+
+static int kvm_nested_vmexit_inject_handler(struct trace_seq *s, struct tep_record *record,
+					    struct tep_event *event, void *context)
+{
+	if (print_exit_reason(s, record, event, "exit_code") < 0)
+		return -1;
+
+	tep_print_num_field(s, " info1 %llx", event, "exit_info1", record, 1);
+	tep_print_num_field(s, " info2 %llx", event, "exit_info2", record, 1);
+	tep_print_num_field(s, " int_info %llx", event, "exit_int_info", record, 1);
+	tep_print_num_field(s, " int_info_err %llx", event, "exit_int_info_err", record, 1);
+
+	return 0;
+}
+
+static int kvm_nested_vmexit_handler(struct trace_seq *s, struct tep_record *record,
+				     struct tep_event *event, void *context)
+{
+	unsigned long long rip;
+
+	if (tep_get_field_val(s, event, "rip", record, &rip, 1) < 0)
+		return -1;
+
+	trace_seq_printf(s, " rip %llx", rip);
+	add_rip_function(s, record, event, rip);
+
+	return kvm_nested_vmexit_inject_handler(s, record, event, context);
+}
+
+union kvm_mmu_page_role {
+	unsigned word;
+	struct {
+		unsigned level:4;
+		unsigned cr4_pae:1;
+		unsigned quadrant:2;
+		unsigned direct:1;
+		unsigned access:3;
+		unsigned invalid:1;
+		unsigned nxe:1;
+		unsigned cr0_wp:1;
+		unsigned smep_and_not_wp:1;
+		unsigned smap_and_not_wp:1;
+		unsigned pad_for_nice_hex_output:8;
+		unsigned smm:8;
+	};
+};
+
+static int kvm_mmu_print_role(struct trace_seq *s, struct tep_record *record,
+			      struct tep_event *event, void *context)
+{
+	unsigned long long val;
+	static const char *access_str[] = {
+		"---", "--x", "w--", "w-x", "-u-", "-ux", "wu-", "wux"
+	};
+	union kvm_mmu_page_role role;
+
+	if (tep_get_field_val(s, event, "role", record, &val, 1) < 0)
+		return -1;
+
+	role.word = (int)val;
+
+	/*
+	 * We can only use the structure if file is of the same
+	 * endianness.
+	 */
+	if (tep_is_file_bigendian(event->tep) ==
+	    tep_is_local_bigendian(event->tep)) {
+
+		trace_seq_printf(s, "%u q%u%s %s%s %spae %snxe %swp%s%s%s",
+				 role.level,
+				 role.quadrant,
+				 role.direct ? " direct" : "",
+				 access_str[role.access],
+				 role.invalid ? " invalid" : "",
+				 role.cr4_pae ? "" : "!",
+				 role.nxe ? "" : "!",
+				 role.cr0_wp ? "" : "!",
+				 role.smep_and_not_wp ? " smep" : "",
+				 role.smap_and_not_wp ? " smap" : "",
+				 role.smm ? " smm" : "");
+	} else
+		trace_seq_printf(s, "WORD: %08x", role.word);
+
+	tep_print_num_field(s, " root %u ",  event,
+			    "root_count", record, 1);
+
+	if (tep_get_field_val(s, event, "unsync", record, &val, 1) < 0)
+		return -1;
+
+	trace_seq_printf(s, "%s%c",  val ? "unsync" : "sync", 0);
+	return 0;
+}
+
+static int kvm_mmu_get_page_handler(struct trace_seq *s,
+				    struct tep_record *record,
+				    struct tep_event *event, void *context)
+{
+	unsigned long long val;
+
+	if (tep_get_field_val(s, event, "created", record, &val, 1) < 0)
+		return -1;
+
+	trace_seq_printf(s, "%s ", val ? "new" : "existing");
+
+	if (tep_get_field_val(s, event, "gfn", record, &val, 1) < 0)
+		return -1;
+
+	trace_seq_printf(s, "sp gfn %llx ", val);
+	return kvm_mmu_print_role(s, record, event, context);
+}
+
+#define PT_WRITABLE_SHIFT 1
+#define PT_WRITABLE_MASK (1ULL << PT_WRITABLE_SHIFT)
+
+static unsigned long long
+process_is_writable_pte(struct trace_seq *s, unsigned long long *args)
+{
+	unsigned long pte = args[0];
+	return pte & PT_WRITABLE_MASK;
+}
+
+int TEP_PLUGIN_LOADER(struct tep_handle *tep)
+{
+	init_disassembler();
+
+	tep_register_event_handler(tep, -1, "kvm", "kvm_exit",
+				   kvm_exit_handler, NULL);
+
+	tep_register_event_handler(tep, -1, "kvm", "kvm_entry",
+				   kvm_entry_handler, NULL);
+
+	tep_register_event_handler(tep, -1, "kvm", "kvm_emulate_insn",
+				   kvm_emulate_insn_handler, NULL);
+
+	tep_register_event_handler(tep, -1, "kvm", "kvm_nested_vmexit",
+				   kvm_nested_vmexit_handler, NULL);
+
+	tep_register_event_handler(tep, -1, "kvm", "kvm_nested_vmexit_inject",
+				   kvm_nested_vmexit_inject_handler, NULL);
+
+	tep_register_event_handler(tep, -1, "kvmmmu", "kvm_mmu_get_page",
+				   kvm_mmu_get_page_handler, NULL);
+
+	tep_register_event_handler(tep, -1, "kvmmmu", "kvm_mmu_sync_page",
+				   kvm_mmu_print_role, NULL);
+
+	tep_register_event_handler(tep, -1,
+				   "kvmmmu", "kvm_mmu_unsync_page",
+				   kvm_mmu_print_role, NULL);
+
+	tep_register_event_handler(tep, -1, "kvmmmu", "kvm_mmu_zap_page",
+				   kvm_mmu_print_role, NULL);
+
+	tep_register_event_handler(tep, -1, "kvmmmu",
+			"kvm_mmu_prepare_zap_page", kvm_mmu_print_role,
+			NULL);
+
+	tep_register_print_function(tep,
+				    process_is_writable_pte,
+				    TEP_FUNC_ARG_INT,
+				    "is_writable_pte",
+				    TEP_FUNC_ARG_LONG,
+				    TEP_FUNC_ARG_VOID);
+	return 0;
+}
+
+void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
+{
+	tep_unregister_event_handler(tep, -1, "kvm", "kvm_exit",
+				     kvm_exit_handler, NULL);
+
+	tep_unregister_event_handler(tep, -1, "kvm", "kvm_entry",
+				     kvm_entry_handler, NULL);
+
+	tep_unregister_event_handler(tep, -1, "kvm", "kvm_emulate_insn",
+				     kvm_emulate_insn_handler, NULL);
+
+	tep_unregister_event_handler(tep, -1, "kvm", "kvm_nested_vmexit",
+				     kvm_nested_vmexit_handler, NULL);
+
+	tep_unregister_event_handler(tep, -1, "kvm", "kvm_nested_vmexit_inject",
+				     kvm_nested_vmexit_inject_handler, NULL);
+
+	tep_unregister_event_handler(tep, -1, "kvmmmu", "kvm_mmu_get_page",
+				     kvm_mmu_get_page_handler, NULL);
+
+	tep_unregister_event_handler(tep, -1, "kvmmmu", "kvm_mmu_sync_page",
+				     kvm_mmu_print_role, NULL);
+
+	tep_unregister_event_handler(tep, -1,
+				     "kvmmmu", "kvm_mmu_unsync_page",
+				     kvm_mmu_print_role, NULL);
+
+	tep_unregister_event_handler(tep, -1, "kvmmmu", "kvm_mmu_zap_page",
+				     kvm_mmu_print_role, NULL);
+
+	tep_unregister_event_handler(tep, -1, "kvmmmu",
+			"kvm_mmu_prepare_zap_page", kvm_mmu_print_role,
+			NULL);
+
+	tep_unregister_print_function(tep, process_is_writable_pte,
+				      "is_writable_pte");
+}
diff --git a/plugins/plugin_mac80211.c b/plugins/plugin_mac80211.c
new file mode 100644
index 0000000..f48071e
--- /dev/null
+++ b/plugins/plugin_mac80211.c
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2009 Johannes Berg <johannes@sipsolutions.net>
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "event-parse.h"
+#include "trace-seq.h"
+
+#define INDENT 65
+
+static void print_string(struct trace_seq *s, struct tep_event *event,
+			 const char *name, const void *data)
+{
+	struct tep_format_field *f = tep_find_field(event, name);
+	int offset;
+	int length;
+
+	if (!f) {
+		trace_seq_printf(s, "NOTFOUND:%s", name);
+		return;
+	}
+
+	offset = f->offset;
+	length = f->size;
+
+	if (!strncmp(f->type, "__data_loc", 10)) {
+		unsigned long long v;
+		if (tep_read_number_field(f, data, &v)) {
+			trace_seq_printf(s, "invalid_data_loc");
+			return;
+		}
+		offset = v & 0xffff;
+		length = v >> 16;
+	}
+
+	trace_seq_printf(s, "%.*s", length, (char *)data + offset);
+}
+
+#define SF(fn)	tep_print_num_field(s, fn ":%d", event, fn, record, 0)
+#define SFX(fn)	tep_print_num_field(s, fn ":%#x", event, fn, record, 0)
+#define SP()	trace_seq_putc(s, ' ')
+
+static int drv_bss_info_changed(struct trace_seq *s,
+				struct tep_record *record,
+				struct tep_event *event, void *context)
+{
+	void *data = record->data;
+
+	print_string(s, event, "wiphy_name", data);
+	trace_seq_printf(s, " vif:");
+	print_string(s, event, "vif_name", data);
+	tep_print_num_field(s, "(%d)", event, "vif_type", record, 1);
+
+	trace_seq_printf(s, "\n%*s", INDENT, "");
+	SF("assoc"); SP();
+	SF("aid"); SP();
+	SF("cts"); SP();
+	SF("shortpre"); SP();
+	SF("shortslot"); SP();
+	SF("dtimper"); SP();
+	trace_seq_printf(s, "\n%*s", INDENT, "");
+	SF("bcnint"); SP();
+	SFX("assoc_cap"); SP();
+	SFX("basic_rates"); SP();
+	SF("enable_beacon");
+	trace_seq_printf(s, "\n%*s", INDENT, "");
+	SF("ht_operation_mode");
+
+	return 0;
+}
+
+int TEP_PLUGIN_LOADER(struct tep_handle *tep)
+{
+	tep_register_event_handler(tep, -1, "mac80211",
+				   "drv_bss_info_changed",
+				   drv_bss_info_changed, NULL);
+	return 0;
+}
+
+void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
+{
+	tep_unregister_event_handler(tep, -1, "mac80211",
+				     "drv_bss_info_changed",
+				     drv_bss_info_changed, NULL);
+}
diff --git a/plugins/plugin_sched_switch.c b/plugins/plugin_sched_switch.c
new file mode 100644
index 0000000..8752cae
--- /dev/null
+++ b/plugins/plugin_sched_switch.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "event-parse.h"
+#include "trace-seq.h"
+
+static void write_state(struct trace_seq *s, int val)
+{
+	const char states[] = "SDTtZXxW";
+	int found = 0;
+	int i;
+
+	for (i = 0; i < (sizeof(states) - 1); i++) {
+		if (!(val & (1 << i)))
+			continue;
+
+		if (found)
+			trace_seq_putc(s, '|');
+
+		found = 1;
+		trace_seq_putc(s, states[i]);
+	}
+
+	if (!found)
+		trace_seq_putc(s, 'R');
+}
+
+static void write_and_save_comm(struct tep_format_field *field,
+				struct tep_record *record,
+				struct trace_seq *s, int pid)
+{
+	const char *comm;
+	int len;
+
+	comm = (char *)(record->data + field->offset);
+	len = s->len;
+	trace_seq_printf(s, "%.*s",
+			 field->size, comm);
+
+	/* make sure the comm has a \0 at the end. */
+	trace_seq_terminate(s);
+	comm = &s->buffer[len];
+
+	/* Help out the comm to ids. This will handle dups */
+	tep_register_comm(field->event->tep, comm, pid);
+}
+
+static int sched_wakeup_handler(struct trace_seq *s,
+				struct tep_record *record,
+				struct tep_event *event, void *context)
+{
+	struct tep_format_field *field;
+	unsigned long long val;
+
+	if (tep_get_field_val(s, event, "pid", record, &val, 1))
+		return trace_seq_putc(s, '!');
+
+	field = tep_find_any_field(event, "comm");
+	if (field) {
+		write_and_save_comm(field, record, s, val);
+		trace_seq_putc(s, ':');
+	}
+	trace_seq_printf(s, "%lld", val);
+
+	if (tep_get_field_val(s, event, "prio", record, &val, 1) == 0)
+		trace_seq_printf(s, " [%lld]", val);
+
+	if (tep_get_field_val(s, event, "success", record, &val, 0) == 0)
+		trace_seq_printf(s, " success=%lld", val);
+
+	if (tep_get_field_val(s, event, "target_cpu", record, &val, 0) == 0)
+		trace_seq_printf(s, " CPU:%03llu", val);
+
+	return 0;
+}
+
+static int sched_switch_handler(struct trace_seq *s,
+				struct tep_record *record,
+				struct tep_event *event, void *context)
+{
+	struct tep_format_field *field;
+	unsigned long long val;
+
+	if (tep_get_field_val(s, event, "prev_pid", record, &val, 1))
+		return trace_seq_putc(s, '!');
+
+	field = tep_find_any_field(event, "prev_comm");
+	if (field) {
+		write_and_save_comm(field, record, s, val);
+		trace_seq_putc(s, ':');
+	}
+	trace_seq_printf(s, "%lld ", val);
+
+	if (tep_get_field_val(s, event, "prev_prio", record, &val, 1) == 0)
+		trace_seq_printf(s, "[%d] ", (int) val);
+
+	if (tep_get_field_val(s,  event, "prev_state", record, &val, 1) == 0)
+		write_state(s, val);
+
+	trace_seq_puts(s, " ==> ");
+
+	if (tep_get_field_val(s, event, "next_pid", record, &val, 1))
+		return trace_seq_putc(s, '!');
+
+	field = tep_find_any_field(event, "next_comm");
+	if (field) {
+		write_and_save_comm(field, record, s, val);
+		trace_seq_putc(s, ':');
+	}
+	trace_seq_printf(s, "%lld", val);
+
+	if (tep_get_field_val(s, event, "next_prio", record, &val, 1) == 0)
+		trace_seq_printf(s, " [%d]", (int) val);
+
+	return 0;
+}
+
+int TEP_PLUGIN_LOADER(struct tep_handle *tep)
+{
+	tep_register_event_handler(tep, -1, "sched", "sched_switch",
+				   sched_switch_handler, NULL);
+
+	tep_register_event_handler(tep, -1, "sched", "sched_wakeup",
+				   sched_wakeup_handler, NULL);
+
+	tep_register_event_handler(tep, -1, "sched", "sched_wakeup_new",
+				   sched_wakeup_handler, NULL);
+	return 0;
+}
+
+void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
+{
+	tep_unregister_event_handler(tep, -1, "sched", "sched_switch",
+				     sched_switch_handler, NULL);
+
+	tep_unregister_event_handler(tep, -1, "sched", "sched_wakeup",
+				     sched_wakeup_handler, NULL);
+
+	tep_unregister_event_handler(tep, -1, "sched", "sched_wakeup_new",
+				     sched_wakeup_handler, NULL);
+}
diff --git a/plugins/plugin_scsi.c b/plugins/plugin_scsi.c
new file mode 100644
index 0000000..5d0387a
--- /dev/null
+++ b/plugins/plugin_scsi.c
@@ -0,0 +1,434 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+#include "event-parse.h"
+#include "trace-seq.h"
+
+typedef unsigned long sector_t;
+typedef uint64_t u64;
+typedef unsigned int u32;
+
+/*
+ *      SCSI opcodes
+ */
+#define TEST_UNIT_READY			0x00
+#define REZERO_UNIT			0x01
+#define REQUEST_SENSE			0x03
+#define FORMAT_UNIT			0x04
+#define READ_BLOCK_LIMITS		0x05
+#define REASSIGN_BLOCKS			0x07
+#define INITIALIZE_ELEMENT_STATUS	0x07
+#define READ_6				0x08
+#define WRITE_6				0x0a
+#define SEEK_6				0x0b
+#define READ_REVERSE			0x0f
+#define WRITE_FILEMARKS			0x10
+#define SPACE				0x11
+#define INQUIRY				0x12
+#define RECOVER_BUFFERED_DATA		0x14
+#define MODE_SELECT			0x15
+#define RESERVE				0x16
+#define RELEASE				0x17
+#define COPY				0x18
+#define ERASE				0x19
+#define MODE_SENSE			0x1a
+#define START_STOP			0x1b
+#define RECEIVE_DIAGNOSTIC		0x1c
+#define SEND_DIAGNOSTIC			0x1d
+#define ALLOW_MEDIUM_REMOVAL		0x1e
+
+#define READ_FORMAT_CAPACITIES		0x23
+#define SET_WINDOW			0x24
+#define READ_CAPACITY			0x25
+#define READ_10				0x28
+#define WRITE_10			0x2a
+#define SEEK_10				0x2b
+#define POSITION_TO_ELEMENT		0x2b
+#define WRITE_VERIFY			0x2e
+#define VERIFY				0x2f
+#define SEARCH_HIGH			0x30
+#define SEARCH_EQUAL			0x31
+#define SEARCH_LOW			0x32
+#define SET_LIMITS			0x33
+#define PRE_FETCH			0x34
+#define READ_POSITION			0x34
+#define SYNCHRONIZE_CACHE		0x35
+#define LOCK_UNLOCK_CACHE		0x36
+#define READ_DEFECT_DATA		0x37
+#define MEDIUM_SCAN			0x38
+#define COMPARE				0x39
+#define COPY_VERIFY			0x3a
+#define WRITE_BUFFER			0x3b
+#define READ_BUFFER			0x3c
+#define UPDATE_BLOCK			0x3d
+#define READ_LONG			0x3e
+#define WRITE_LONG			0x3f
+#define CHANGE_DEFINITION		0x40
+#define WRITE_SAME			0x41
+#define UNMAP				0x42
+#define READ_TOC			0x43
+#define READ_HEADER			0x44
+#define GET_EVENT_STATUS_NOTIFICATION	0x4a
+#define LOG_SELECT			0x4c
+#define LOG_SENSE			0x4d
+#define XDWRITEREAD_10			0x53
+#define MODE_SELECT_10			0x55
+#define RESERVE_10			0x56
+#define RELEASE_10			0x57
+#define MODE_SENSE_10			0x5a
+#define PERSISTENT_RESERVE_IN		0x5e
+#define PERSISTENT_RESERVE_OUT		0x5f
+#define VARIABLE_LENGTH_CMD		0x7f
+#define REPORT_LUNS			0xa0
+#define SECURITY_PROTOCOL_IN		0xa2
+#define MAINTENANCE_IN			0xa3
+#define MAINTENANCE_OUT			0xa4
+#define MOVE_MEDIUM			0xa5
+#define EXCHANGE_MEDIUM			0xa6
+#define READ_12				0xa8
+#define SERVICE_ACTION_OUT_12		0xa9
+#define WRITE_12			0xaa
+#define SERVICE_ACTION_IN_12		0xab
+#define WRITE_VERIFY_12			0xae
+#define VERIFY_12			0xaf
+#define SEARCH_HIGH_12			0xb0
+#define SEARCH_EQUAL_12			0xb1
+#define SEARCH_LOW_12			0xb2
+#define SECURITY_PROTOCOL_OUT		0xb5
+#define READ_ELEMENT_STATUS		0xb8
+#define SEND_VOLUME_TAG			0xb6
+#define WRITE_LONG_2			0xea
+#define EXTENDED_COPY			0x83
+#define RECEIVE_COPY_RESULTS		0x84
+#define ACCESS_CONTROL_IN		0x86
+#define ACCESS_CONTROL_OUT		0x87
+#define READ_16				0x88
+#define WRITE_16			0x8a
+#define READ_ATTRIBUTE			0x8c
+#define WRITE_ATTRIBUTE			0x8d
+#define VERIFY_16			0x8f
+#define SYNCHRONIZE_CACHE_16		0x91
+#define WRITE_SAME_16			0x93
+#define SERVICE_ACTION_BIDIRECTIONAL	0x9d
+#define SERVICE_ACTION_IN_16		0x9e
+#define SERVICE_ACTION_OUT_16		0x9f
+/* values for service action in */
+#define	SAI_READ_CAPACITY_16		0x10
+#define SAI_GET_LBA_STATUS		0x12
+/* values for VARIABLE_LENGTH_CMD service action codes
+ * see spc4r17 Section D.3.5, table D.7 and D.8 */
+#define VLC_SA_RECEIVE_CREDENTIAL	0x1800
+/* values for maintenance in */
+#define MI_REPORT_IDENTIFYING_INFORMATION		0x05
+#define MI_REPORT_TARGET_PGS				0x0a
+#define MI_REPORT_ALIASES				0x0b
+#define MI_REPORT_SUPPORTED_OPERATION_CODES		0x0c
+#define MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS	0x0d
+#define MI_REPORT_PRIORITY				0x0e
+#define MI_REPORT_TIMESTAMP				0x0f
+#define MI_MANAGEMENT_PROTOCOL_IN			0x10
+/* value for MI_REPORT_TARGET_PGS ext header */
+#define MI_EXT_HDR_PARAM_FMT		0x20
+/* values for maintenance out */
+#define MO_SET_IDENTIFYING_INFORMATION	0x06
+#define MO_SET_TARGET_PGS		0x0a
+#define MO_CHANGE_ALIASES		0x0b
+#define MO_SET_PRIORITY			0x0e
+#define MO_SET_TIMESTAMP		0x0f
+#define MO_MANAGEMENT_PROTOCOL_OUT	0x10
+/* values for variable length command */
+#define XDREAD_32			0x03
+#define XDWRITE_32			0x04
+#define XPWRITE_32			0x06
+#define XDWRITEREAD_32			0x07
+#define READ_32				0x09
+#define VERIFY_32			0x0a
+#define WRITE_32			0x0b
+#define WRITE_SAME_32			0x0d
+
+#define SERVICE_ACTION16(cdb) (cdb[1] & 0x1f)
+#define SERVICE_ACTION32(cdb) ((cdb[8] << 8) | cdb[9])
+
+static const char *
+scsi_trace_misc(struct trace_seq *, unsigned char *, int);
+
+static const char *
+scsi_trace_rw6(struct trace_seq *p, unsigned char *cdb, int len)
+{
+	const char *ret = p->buffer + p->len;
+	sector_t lba = 0, txlen = 0;
+
+	lba |= ((cdb[1] & 0x1F) << 16);
+	lba |=  (cdb[2] << 8);
+	lba |=   cdb[3];
+	txlen = cdb[4];
+
+	trace_seq_printf(p, "lba=%llu txlen=%llu",
+			 (unsigned long long)lba, (unsigned long long)txlen);
+	trace_seq_putc(p, 0);
+	return ret;
+}
+
+static const char *
+scsi_trace_rw10(struct trace_seq *p, unsigned char *cdb, int len)
+{
+	const char *ret = p->buffer + p->len;
+	sector_t lba = 0, txlen = 0;
+
+	lba |= (cdb[2] << 24);
+	lba |= (cdb[3] << 16);
+	lba |= (cdb[4] << 8);
+	lba |=  cdb[5];
+	txlen |= (cdb[7] << 8);
+	txlen |=  cdb[8];
+
+	trace_seq_printf(p, "lba=%llu txlen=%llu protect=%u",
+			 (unsigned long long)lba, (unsigned long long)txlen,
+			 cdb[1] >> 5);
+
+	if (cdb[0] == WRITE_SAME)
+		trace_seq_printf(p, " unmap=%u", cdb[1] >> 3 & 1);
+
+	trace_seq_putc(p, 0);
+	return ret;
+}
+
+static const char *
+scsi_trace_rw12(struct trace_seq *p, unsigned char *cdb, int len)
+{
+	const char *ret = p->buffer + p->len;
+	sector_t lba = 0, txlen = 0;
+
+	lba |= (cdb[2] << 24);
+	lba |= (cdb[3] << 16);
+	lba |= (cdb[4] << 8);
+	lba |=  cdb[5];
+	txlen |= (cdb[6] << 24);
+	txlen |= (cdb[7] << 16);
+	txlen |= (cdb[8] << 8);
+	txlen |=  cdb[9];
+
+	trace_seq_printf(p, "lba=%llu txlen=%llu protect=%u",
+			 (unsigned long long)lba, (unsigned long long)txlen,
+			 cdb[1] >> 5);
+	trace_seq_putc(p, 0);
+	return ret;
+}
+
+static const char *
+scsi_trace_rw16(struct trace_seq *p, unsigned char *cdb, int len)
+{
+	const char *ret = p->buffer + p->len;
+	sector_t lba = 0, txlen = 0;
+
+	lba |= ((u64)cdb[2] << 56);
+	lba |= ((u64)cdb[3] << 48);
+	lba |= ((u64)cdb[4] << 40);
+	lba |= ((u64)cdb[5] << 32);
+	lba |= (cdb[6] << 24);
+	lba |= (cdb[7] << 16);
+	lba |= (cdb[8] << 8);
+	lba |=  cdb[9];
+	txlen |= (cdb[10] << 24);
+	txlen |= (cdb[11] << 16);
+	txlen |= (cdb[12] << 8);
+	txlen |=  cdb[13];
+
+	trace_seq_printf(p, "lba=%llu txlen=%llu protect=%u",
+			 (unsigned long long)lba, (unsigned long long)txlen,
+			 cdb[1] >> 5);
+
+	if (cdb[0] == WRITE_SAME_16)
+		trace_seq_printf(p, " unmap=%u", cdb[1] >> 3 & 1);
+
+	trace_seq_putc(p, 0);
+	return ret;
+}
+
+static const char *
+scsi_trace_rw32(struct trace_seq *p, unsigned char *cdb, int len)
+{
+	const char *ret = p->buffer + p->len, *cmd;
+	sector_t lba = 0, txlen = 0;
+	u32 ei_lbrt = 0;
+
+	switch (SERVICE_ACTION32(cdb)) {
+	case READ_32:
+		cmd = "READ";
+		break;
+	case VERIFY_32:
+		cmd = "VERIFY";
+		break;
+	case WRITE_32:
+		cmd = "WRITE";
+		break;
+	case WRITE_SAME_32:
+		cmd = "WRITE_SAME";
+		break;
+	default:
+		trace_seq_printf(p, "UNKNOWN");
+		goto out;
+	}
+
+	lba |= ((u64)cdb[12] << 56);
+	lba |= ((u64)cdb[13] << 48);
+	lba |= ((u64)cdb[14] << 40);
+	lba |= ((u64)cdb[15] << 32);
+	lba |= (cdb[16] << 24);
+	lba |= (cdb[17] << 16);
+	lba |= (cdb[18] << 8);
+	lba |=  cdb[19];
+	ei_lbrt |= (cdb[20] << 24);
+	ei_lbrt |= (cdb[21] << 16);
+	ei_lbrt |= (cdb[22] << 8);
+	ei_lbrt |=  cdb[23];
+	txlen |= (cdb[28] << 24);
+	txlen |= (cdb[29] << 16);
+	txlen |= (cdb[30] << 8);
+	txlen |=  cdb[31];
+
+	trace_seq_printf(p, "%s_32 lba=%llu txlen=%llu protect=%u ei_lbrt=%u",
+			 cmd, (unsigned long long)lba,
+			 (unsigned long long)txlen, cdb[10] >> 5, ei_lbrt);
+
+	if (SERVICE_ACTION32(cdb) == WRITE_SAME_32)
+		trace_seq_printf(p, " unmap=%u", cdb[10] >> 3 & 1);
+
+out:
+	trace_seq_putc(p, 0);
+	return ret;
+}
+
+static const char *
+scsi_trace_unmap(struct trace_seq *p, unsigned char *cdb, int len)
+{
+	const char *ret = p->buffer + p->len;
+	unsigned int regions = cdb[7] << 8 | cdb[8];
+
+	trace_seq_printf(p, "regions=%u", (regions - 8) / 16);
+	trace_seq_putc(p, 0);
+	return ret;
+}
+
+static const char *
+scsi_trace_service_action_in(struct trace_seq *p, unsigned char *cdb, int len)
+{
+	const char *ret = p->buffer + p->len, *cmd;
+	sector_t lba = 0;
+	u32 alloc_len = 0;
+
+	switch (SERVICE_ACTION16(cdb)) {
+	case SAI_READ_CAPACITY_16:
+		cmd = "READ_CAPACITY_16";
+		break;
+	case SAI_GET_LBA_STATUS:
+		cmd = "GET_LBA_STATUS";
+		break;
+	default:
+		trace_seq_printf(p, "UNKNOWN");
+		goto out;
+	}
+
+	lba |= ((u64)cdb[2] << 56);
+	lba |= ((u64)cdb[3] << 48);
+	lba |= ((u64)cdb[4] << 40);
+	lba |= ((u64)cdb[5] << 32);
+	lba |= (cdb[6] << 24);
+	lba |= (cdb[7] << 16);
+	lba |= (cdb[8] << 8);
+	lba |=  cdb[9];
+	alloc_len |= (cdb[10] << 24);
+	alloc_len |= (cdb[11] << 16);
+	alloc_len |= (cdb[12] << 8);
+	alloc_len |=  cdb[13];
+
+	trace_seq_printf(p, "%s lba=%llu alloc_len=%u", cmd,
+			 (unsigned long long)lba, alloc_len);
+
+out:
+	trace_seq_putc(p, 0);
+	return ret;
+}
+
+static const char *
+scsi_trace_varlen(struct trace_seq *p, unsigned char *cdb, int len)
+{
+	switch (SERVICE_ACTION32(cdb)) {
+	case READ_32:
+	case VERIFY_32:
+	case WRITE_32:
+	case WRITE_SAME_32:
+		return scsi_trace_rw32(p, cdb, len);
+	default:
+		return scsi_trace_misc(p, cdb, len);
+	}
+}
+
+static const char *
+scsi_trace_misc(struct trace_seq *p, unsigned char *cdb, int len)
+{
+	const char *ret = p->buffer + p->len;
+
+	trace_seq_printf(p, "-");
+	trace_seq_putc(p, 0);
+	return ret;
+}
+
+const char *
+scsi_trace_parse_cdb(struct trace_seq *p, unsigned char *cdb, int len)
+{
+	switch (cdb[0]) {
+	case READ_6:
+	case WRITE_6:
+		return scsi_trace_rw6(p, cdb, len);
+	case READ_10:
+	case VERIFY:
+	case WRITE_10:
+	case WRITE_SAME:
+		return scsi_trace_rw10(p, cdb, len);
+	case READ_12:
+	case VERIFY_12:
+	case WRITE_12:
+		return scsi_trace_rw12(p, cdb, len);
+	case READ_16:
+	case VERIFY_16:
+	case WRITE_16:
+	case WRITE_SAME_16:
+		return scsi_trace_rw16(p, cdb, len);
+	case UNMAP:
+		return scsi_trace_unmap(p, cdb, len);
+	case SERVICE_ACTION_IN_16:
+		return scsi_trace_service_action_in(p, cdb, len);
+	case VARIABLE_LENGTH_CMD:
+		return scsi_trace_varlen(p, cdb, len);
+	default:
+		return scsi_trace_misc(p, cdb, len);
+	}
+}
+
+unsigned long long process_scsi_trace_parse_cdb(struct trace_seq *s,
+						unsigned long long *args)
+{
+	scsi_trace_parse_cdb(s, (unsigned char *) (unsigned long) args[1], args[2]);
+	return 0;
+}
+
+int TEP_PLUGIN_LOADER(struct tep_handle *tep)
+{
+	tep_register_print_function(tep,
+				    process_scsi_trace_parse_cdb,
+				    TEP_FUNC_ARG_STRING,
+				    "scsi_trace_parse_cdb",
+				    TEP_FUNC_ARG_PTR,
+				    TEP_FUNC_ARG_PTR,
+				    TEP_FUNC_ARG_INT,
+				    TEP_FUNC_ARG_VOID);
+	return 0;
+}
+
+void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
+{
+	tep_unregister_print_function(tep, process_scsi_trace_parse_cdb,
+				      "scsi_trace_parse_cdb");
+}
diff --git a/plugins/plugin_tlb.c b/plugins/plugin_tlb.c
new file mode 100644
index 0000000..43657fb
--- /dev/null
+++ b/plugins/plugin_tlb.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2015 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "event-parse.h"
+
+enum tlb_flush_reason {
+	TLB_FLUSH_ON_TASK_SWITCH,
+	TLB_REMOTE_SHOOTDOWN,
+	TLB_LOCAL_SHOOTDOWN,
+	TLB_LOCAL_MM_SHOOTDOWN,
+	NR_TLB_FLUSH_REASONS,
+};
+
+static int tlb_flush_handler(struct trace_seq *s, struct tep_record *record,
+			     struct tep_event *event, void *context)
+{
+	unsigned long long val;
+
+	trace_seq_printf(s, "pages=");
+
+	tep_print_num_field(s, "%ld", event, "pages", record, 1);
+
+	if (tep_get_field_val(s, event, "reason", record, &val, 1) < 0)
+		return -1;
+
+	trace_seq_puts(s, " reason=");
+
+	switch (val) {
+	case TLB_FLUSH_ON_TASK_SWITCH:
+		trace_seq_puts(s, "flush on task switch");
+		break;
+	case TLB_REMOTE_SHOOTDOWN:
+		trace_seq_puts(s, "remote shootdown");
+		break;
+	case TLB_LOCAL_SHOOTDOWN:
+		trace_seq_puts(s, "local shootdown");
+		break;
+	case TLB_LOCAL_MM_SHOOTDOWN:
+		trace_seq_puts(s, "local mm shootdown");
+		break;
+	}
+
+	trace_seq_printf(s, " (%lld)", val);
+
+	return 0;
+}
+
+int TEP_PLUGIN_LOADER(struct tep_handle *tep)
+{
+	tep_register_event_handler(tep, -1, "tlb", "tlb_flush",
+				   tlb_flush_handler, NULL);
+
+	return 0;
+}
+
+void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
+{
+	tep_unregister_event_handler(tep, -1,
+				     "tlb", "tlb_flush",
+				     tlb_flush_handler, NULL);
+}
diff --git a/plugins/plugin_xen.c b/plugins/plugin_xen.c
new file mode 100644
index 0000000..993b208
--- /dev/null
+++ b/plugins/plugin_xen.c
@@ -0,0 +1,138 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "event-parse.h"
+#include "trace-seq.h"
+
+#define __HYPERVISOR_set_trap_table			0
+#define __HYPERVISOR_mmu_update				1
+#define __HYPERVISOR_set_gdt				2
+#define __HYPERVISOR_stack_switch			3
+#define __HYPERVISOR_set_callbacks			4
+#define __HYPERVISOR_fpu_taskswitch			5
+#define __HYPERVISOR_sched_op_compat			6
+#define __HYPERVISOR_dom0_op				7
+#define __HYPERVISOR_set_debugreg			8
+#define __HYPERVISOR_get_debugreg			9
+#define __HYPERVISOR_update_descriptor			10
+#define __HYPERVISOR_memory_op				12
+#define __HYPERVISOR_multicall				13
+#define __HYPERVISOR_update_va_mapping			14
+#define __HYPERVISOR_set_timer_op			15
+#define __HYPERVISOR_event_channel_op_compat		16
+#define __HYPERVISOR_xen_version			17
+#define __HYPERVISOR_console_io				18
+#define __HYPERVISOR_physdev_op_compat			19
+#define __HYPERVISOR_grant_table_op			20
+#define __HYPERVISOR_vm_assist				21
+#define __HYPERVISOR_update_va_mapping_otherdomain	22
+#define __HYPERVISOR_iret				23 /* x86 only */
+#define __HYPERVISOR_vcpu_op				24
+#define __HYPERVISOR_set_segment_base			25 /* x86/64 only */
+#define __HYPERVISOR_mmuext_op				26
+#define __HYPERVISOR_acm_op				27
+#define __HYPERVISOR_nmi_op				28
+#define __HYPERVISOR_sched_op				29
+#define __HYPERVISOR_callback_op			30
+#define __HYPERVISOR_xenoprof_op			31
+#define __HYPERVISOR_event_channel_op			32
+#define __HYPERVISOR_physdev_op				33
+#define __HYPERVISOR_hvm_op				34
+#define __HYPERVISOR_tmem_op				38
+
+/* Architecture-specific hypercall definitions. */
+#define __HYPERVISOR_arch_0				48
+#define __HYPERVISOR_arch_1				49
+#define __HYPERVISOR_arch_2				50
+#define __HYPERVISOR_arch_3				51
+#define __HYPERVISOR_arch_4				52
+#define __HYPERVISOR_arch_5				53
+#define __HYPERVISOR_arch_6				54
+#define __HYPERVISOR_arch_7				55
+
+#define N(x)	[__HYPERVISOR_##x] = "("#x")"
+static const char *xen_hypercall_names[] = {
+	N(set_trap_table),
+	N(mmu_update),
+	N(set_gdt),
+	N(stack_switch),
+	N(set_callbacks),
+	N(fpu_taskswitch),
+	N(sched_op_compat),
+	N(dom0_op),
+	N(set_debugreg),
+	N(get_debugreg),
+	N(update_descriptor),
+	N(memory_op),
+	N(multicall),
+	N(update_va_mapping),
+	N(set_timer_op),
+	N(event_channel_op_compat),
+	N(xen_version),
+	N(console_io),
+	N(physdev_op_compat),
+	N(grant_table_op),
+	N(vm_assist),
+	N(update_va_mapping_otherdomain),
+	N(iret),
+	N(vcpu_op),
+	N(set_segment_base),
+	N(mmuext_op),
+	N(acm_op),
+	N(nmi_op),
+	N(sched_op),
+	N(callback_op),
+	N(xenoprof_op),
+	N(event_channel_op),
+	N(physdev_op),
+	N(hvm_op),
+
+/* Architecture-specific hypercall definitions. */
+	N(arch_0),
+	N(arch_1),
+	N(arch_2),
+	N(arch_3),
+	N(arch_4),
+	N(arch_5),
+	N(arch_6),
+	N(arch_7),
+};
+#undef N
+
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+
+static const char *xen_hypercall_name(unsigned op)
+{
+	if (op < ARRAY_SIZE(xen_hypercall_names) &&
+	    xen_hypercall_names[op] != NULL)
+		return xen_hypercall_names[op];
+
+	return "";
+}
+
+unsigned long long process_xen_hypercall_name(struct trace_seq *s,
+					      unsigned long long *args)
+{
+	unsigned int op = args[0];
+
+	trace_seq_printf(s, "%s", xen_hypercall_name(op));
+	return 0;
+}
+
+int TEP_PLUGIN_LOADER(struct tep_handle *tep)
+{
+	tep_register_print_function(tep,
+				    process_xen_hypercall_name,
+				    TEP_FUNC_ARG_STRING,
+				    "xen_hypercall_name",
+				    TEP_FUNC_ARG_INT,
+				    TEP_FUNC_ARG_VOID);
+	return 0;
+}
+
+void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
+{
+	tep_unregister_print_function(tep, process_xen_hypercall_name,
+				      "xen_hypercall_name");
+}
diff --git a/samples/Makefile b/samples/Makefile
new file mode 100644
index 0000000..2962611
--- /dev/null
+++ b/samples/Makefile
@@ -0,0 +1,26 @@
+# SPDX-License-Identifier: LGPL-2.1
+
+include $(src)/scripts/utils.mk
+
+TARGETS :=
+TARGETS += test-event
+
+sdir := $(obj)/samples
+
+TARGETS := $(patsubst %,$(sdir)/%,$(TARGETS))
+
+all: $(TARGETS)
+
+$(sdir):
+	@mkdir -p $(sdir)
+
+$(TARGETS): $(sdir) $(LIBTRACEEVENT_STATIC)
+
+$(sdir)/%: $(bdir)/%.o
+	$(call do_sample_build,$@,$<)
+
+$(bdir)/%.o: $(bdir)/%.c
+	$(Q)$(CC) -o $@ -c $< $(CFLAGS) $(INCLUDES)
+
+clean:
+	$(Q)$(call do_clean,$(sdir)/*)
diff --git a/samples/test-event.c b/samples/test-event.c
new file mode 100644
index 0000000..b25da1e
--- /dev/null
+++ b/samples/test-event.c
@@ -0,0 +1,154 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2022 Google Inc, Steven Rostedt <rostedt@goodmis.org>
+ */
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <getopt.h>
+#include <event-parse.h>
+
+static char *argv0;
+
+static char *get_this_name(void)
+{
+	static char *this_name;
+	char *arg;
+	char *p;
+
+	if (this_name)
+		return this_name;
+
+	arg = argv0;
+	p = arg+strlen(arg);
+
+	while (p >= arg && *p != '/')
+		p--;
+	p++;
+
+	this_name = p;
+	return p;
+}
+
+static void usage(void)
+{
+	char *p = get_this_name();
+
+	printf("usage: %s [options]\n"
+	       " -h : this message\n"
+	       " -s system : the system for the event\n"
+	       " -e format : the event format file\n"
+	       " -f file : file to read the event from\n"
+	       "      otherwise, reads from stdin\n"
+	       "\n",p);
+	exit(-1);
+}
+
+static void __vdie(const char *fmt, va_list ap, int err)
+{
+	int ret = errno;
+	char *p = get_this_name();
+
+	if (err && errno)
+		perror(p);
+	else
+		ret = -1;
+
+	fprintf(stderr, "  ");
+	vfprintf(stderr, fmt, ap);
+
+	fprintf(stderr, "\n");
+	exit(ret);
+}
+
+void die(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	__vdie(fmt, ap, 0);
+	va_end(ap);
+}
+
+void pdie(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	__vdie(fmt, ap, 1);
+	va_end(ap);
+}
+
+/* Must be a power of two */
+#define BUFALLOC	1024
+#define BUFMASK		(~(BUFALLOC - 1))
+
+int main(int argc, char **argv)
+{
+	struct tep_handle *tep;
+	struct tep_event *event;
+	FILE *file = stdin;
+	FILE *fp = NULL;
+	char *system = NULL;
+	char *event_buf = NULL;
+	int esize = 0;
+	int c;
+
+	argv0 = argv[0];
+
+	while ((c = getopt(argc, argv, "hs:e:f:")) >= 0) {
+		switch (c) {
+		case 's':
+			system = optarg;
+			break;
+		case 'e':
+			event_buf = optarg;
+			file = NULL;
+			break;
+		case 'f':
+			fp = fopen(optarg, "r");
+			if (!fp)
+				pdie("%s", optarg);
+			file = fp;
+			break;
+		case 'h':
+			usage();
+		}
+	}
+	if (file) {
+		char *line = NULL;
+		size_t n = 0;
+		int len;
+
+		while (getline(&line, &n, file) > 0) {
+			len = strlen(line) + 1;
+
+			if (((esize - 1) & BUFMASK) < ((esize + len) & BUFMASK)) {
+				int a;
+
+				a = (esize + len + BUFALLOC - 1) & BUFMASK;
+				event_buf = realloc(event_buf, a);
+				if (!event_buf)
+					pdie("allocating event");
+			}
+			strcpy(event_buf + esize, line);
+			esize += len - 1;
+		}
+		free(line);
+	}
+
+	tep = tep_alloc();
+	if (!tep)
+		pdie("Allocating tep handle");
+
+	tep_set_loglevel(TEP_LOG_ALL);
+
+	if (!system)
+		system = "test";
+
+	if (tep_parse_format(tep, &event, event_buf, esize, system))
+		die("Failed to parse event");
+
+}
diff --git a/scripts/features.mk b/scripts/features.mk
new file mode 100644
index 0000000..9c7f8c3
--- /dev/null
+++ b/scripts/features.mk
@@ -0,0 +1,37 @@
+# SPDX-License-Identifier: GPL-2.0
+
+# taken from perf which was based on Linux Kbuild
+# try-cc
+# Usage: option = $(call try-cc, source-to-build, cc-options)
+try-cc = $(shell sh -c							\
+	'TMP="$(BUILD_OUTPUT)$(TMPOUT).$$$$";						\
+	echo "$(1)" |							\
+	$(CC) -x c - $(2) -o "$$TMP" > /dev/null 2>&1 && echo y;	\
+	rm -f "$$TMP"')
+
+define SOURCE_PTRACE
+#include <stdio.h>
+#include <sys/ptrace.h>
+
+int main (void)
+{
+	int ret;
+	ret = ptrace(PTRACE_ATTACH, 0, NULL, 0);
+	ptrace(PTRACE_TRACEME, 0, NULL, 0);
+	ptrace(PTRACE_GETSIGINFO, 0, NULL, NULL);
+	ptrace(PTRACE_GETEVENTMSG, 0, NULL, NULL);
+	ptrace(PTRACE_SETOPTIONS, NULL, NULL,
+		       PTRACE_O_TRACEFORK |
+		       PTRACE_O_TRACEVFORK |
+		       PTRACE_O_TRACECLONE |
+		       PTRACE_O_TRACEEXIT);
+	ptrace(PTRACE_CONT, NULL, NULL, 0);
+	ptrace(PTRACE_DETACH, 0, NULL, NULL);
+	ptrace(PTRACE_SETOPTIONS, 0, NULL,
+	       PTRACE_O_TRACEFORK |
+	       PTRACE_O_TRACEVFORK |
+	       PTRACE_O_TRACECLONE |
+	       PTRACE_O_TRACEEXIT);
+	return ret;
+}
+endef
diff --git a/scripts/utilities.mak b/scripts/utilities.mak
new file mode 100644
index 0000000..4852b55
--- /dev/null
+++ b/scripts/utilities.mak
@@ -0,0 +1,180 @@
+# SPDX-License-Identifier: GPL-2.0
+# This allows us to work with the newline character:
+define newline
+
+
+endef
+newline := $(newline)
+
+# nl-escape
+#
+# Usage: escape = $(call nl-escape[,escape])
+#
+# This is used as the common way to specify
+# what should replace a newline when escaping
+# newlines; the default is a bizarre string.
+#
+nl-escape = $(if $(1),$(1),m822df3020w6a44id34bt574ctac44eb9f4n)
+
+# escape-nl
+#
+# Usage: escaped-text = $(call escape-nl,text[,escape])
+#
+# GNU make's $(shell ...) function converts to a
+# single space each newline character in the output
+# produced during the expansion; this may not be
+# desirable.
+#
+# The only solution is to change each newline into
+# something that won't be converted, so that the
+# information can be recovered later with
+# $(call unescape-nl...)
+#
+escape-nl = $(subst $(newline),$(call nl-escape,$(2)),$(1))
+
+# unescape-nl
+#
+# Usage: text = $(call unescape-nl,escaped-text[,escape])
+#
+# See escape-nl.
+#
+unescape-nl = $(subst $(call nl-escape,$(2)),$(newline),$(1))
+
+# shell-escape-nl
+#
+# Usage: $(shell some-command | $(call shell-escape-nl[,escape]))
+#
+# Use this to escape newlines from within a shell call;
+# the default escape is a bizarre string.
+#
+# NOTE: The escape is used directly as a string constant
+#       in an `awk' program that is delimited by shell
+#       single-quotes, so be wary of the characters
+#       that are chosen.
+#
+define shell-escape-nl
+awk 'NR==1 {t=$$0} NR>1 {t=t "$(nl-escape)" $$0} END {printf t}'
+endef
+
+# shell-unescape-nl
+#
+# Usage: $(shell some-command | $(call shell-unescape-nl[,escape]))
+#
+# Use this to unescape newlines from within a shell call;
+# the default escape is a bizarre string.
+#
+# NOTE: The escape is used directly as an extended regular
+#       expression constant in an `awk' program that is
+#       delimited by shell single-quotes, so be wary
+#       of the characters that are chosen.
+#
+# (The bash shell has a bug where `{gsub(...),...}' is
+#  misinterpreted as a brace expansion; this can be
+#  overcome by putting a space between `{' and `gsub').
+#
+define shell-unescape-nl
+awk 'NR==1 {t=$$0} NR>1 {t=t "\n" $$0} END { gsub(/$(nl-escape)/,"\n",t); printf t }'
+endef
+
+# escape-for-shell-sq
+#
+# Usage: embeddable-text = $(call escape-for-shell-sq,text)
+#
+# This function produces text that is suitable for
+# embedding in a shell string that is delimited by
+# single-quotes.
+#
+escape-for-shell-sq =  $(subst ','\'',$(1))
+
+# shell-sq
+#
+# Usage: single-quoted-and-escaped-text = $(call shell-sq,text)
+#
+shell-sq = '$(escape-for-shell-sq)'
+
+# shell-wordify
+#
+# Usage: wordified-text = $(call shell-wordify,text)
+#
+# For instance:
+#
+#  |define text
+#  |hello
+#  |world
+#  |endef
+#  |
+#  |target:
+#  |	echo $(call shell-wordify,$(text))
+#
+# At least GNU make gets confused by expanding a newline
+# within the context of a command line of a makefile rule
+# (this is in constrast to a `$(shell ...)' function call,
+# which can handle it just fine).
+#
+# This function avoids the problem by producing a string
+# that works as a shell word, regardless of whether or
+# not it contains a newline.
+#
+# If the text to be wordified contains a newline, then
+# an intrictate shell command substitution is constructed
+# to render the text as a single line; when the shell
+# processes the resulting escaped text, it transforms
+# it into the original unescaped text.
+#
+# If the text does not contain a newline, then this function
+# produces the same results as the `$(shell-sq)' function.
+#
+shell-wordify = $(if $(findstring $(newline),$(1)),$(_sw-esc-nl),$(shell-sq))
+define _sw-esc-nl
+"$$(echo $(call escape-nl,$(shell-sq),$(2)) | $(call shell-unescape-nl,$(2)))"
+endef
+
+# is-absolute
+#
+# Usage: bool-value = $(call is-absolute,path)
+#
+is-absolute = $(shell echo $(shell-sq) | grep -q ^/ && echo y)
+
+# lookup
+#
+# Usage: absolute-executable-path-or-empty = $(call lookup,path)
+#
+# (It's necessary to use `sh -c' because GNU make messes up by
+#  trying too hard and getting things wrong).
+#
+lookup = $(call unescape-nl,$(shell sh -c $(_l-sh)))
+_l-sh = $(call shell-sq,command -v $(shell-sq) | $(call shell-escape-nl,))
+
+# is-executable
+#
+# Usage: bool-value = $(call is-executable,path)
+#
+# (It's necessary to use `sh -c' because GNU make messes up by
+#  trying too hard and getting things wrong).
+#
+is-executable = $(call _is-executable-helper,$(shell-sq))
+_is-executable-helper = $(shell sh -c $(_is-executable-sh))
+_is-executable-sh = $(call shell-sq,test -f $(1) -a -x $(1) && echo y)
+
+# get-executable
+#
+# Usage: absolute-executable-path-or-empty = $(call get-executable,path)
+#
+# The goal is to get an absolute path for an executable;
+# the `command -v' is defined by POSIX, but it's not
+# necessarily very portable, so it's only used if
+# relative path resolution is requested, as determined
+# by the presence of a leading `/'.
+#
+get-executable = $(if $(1),$(if $(is-absolute),$(_ge-abspath),$(lookup)))
+_ge-abspath = $(if $(is-executable),$(1))
+
+# get-supplied-or-default-executable
+#
+# Usage: absolute-executable-path-or-empty = $(call get-executable-or-default,variable,default)
+#
+define get-executable-or-default
+$(if $($(1)),$(call _ge_attempt,$($(1)),$(1)),$(call _ge_attempt,$(2)))
+endef
+_ge_attempt = $(if $(get-executable),$(get-executable),$(call _gea_err,$(2)))
+_gea_err  = $(if $(1),$(error Please set '$(1)' appropriately))
diff --git a/scripts/utils.mk b/scripts/utils.mk
new file mode 100644
index 0000000..7139088
--- /dev/null
+++ b/scripts/utils.mk
@@ -0,0 +1,182 @@
+# SPDX-License-Identifier: LGPL-2.1
+
+# Utils
+
+ PWD		:= $(shell /bin/pwd)
+ GOBJ		= $(notdir $(strip $@))
+ BASE1		= $(notdir $(strip $1))
+ BASE2		= $(notdir $(strip $2))
+ BASEPWD	= $(notdir $(strip $(PWD)))
+
+
+ifeq ($(VERBOSE),1)
+  Q =
+  S =
+else
+  Q = @
+  S = -s
+endif
+
+# Use empty print_* macros if either SILENT or VERBOSE.
+ifeq ($(findstring 1,$(SILENT)$(VERBOSE)),1)
+  print_compile =
+  print_app_build =
+  print_fpic_compile =
+  print_shared_lib_compile =
+  print_plugin_obj_compile =
+  print_plugin_build =
+  print_install =
+  print_uninstall =
+  print_gen =
+  print_update =
+  print_descend =
+  print_clean =
+else
+  print_compile =		echo '  COMPILE            '$(GOBJ);
+  print_app_build =		echo '  BUILD              '$(GOBJ);
+  print_fpic_compile =		echo '  COMPILE FPIC       '$(GOBJ);
+  print_shared_lib_compile =	echo '  COMPILE SHARED LIB '$(GOBJ);
+  print_plugin_obj_compile =	echo '  COMPILE PLUGIN OBJ '$(GOBJ);
+  print_plugin_build =		echo '  BUILD PLUGIN       '$(GOBJ);
+  print_static_lib_build =	echo '  BUILD STATIC LIB   '$(GOBJ);
+  print_install =		echo '  INSTALL     '$1'	to	$(DESTDIR_SQ)$2';
+  print_uninstall =		echo '  UNINSTALL     $(DESTDIR_SQ)$1';
+  print_gen =			echo '  GEN                '$(GOBJ);
+  print_update =		echo '  UPDATE             '$(GOBJ);
+  print_descend =		echo '  DESCEND            '$(BASE1) $(BASE2);
+  print_clean =			echo '  CLEAN              '$(BASEPWD);
+endif
+
+do_fpic_compile =					\
+	($(print_fpic_compile)				\
+	$(CC) -c $(CPPFLAGS) $(CFLAGS) $(EXT) -fPIC $< -o $@)
+
+do_compile =							\
+	($(if $(GENERATE_PIC), $(do_fpic_compile),		\
+	 $(print_compile)					\
+	 $(CC) -c $(CPPFLAGS) $(CFLAGS) $(EXT) $< -o $@))
+
+do_app_build =						\
+	($(print_app_build)				\
+	$(CC) $^ -rdynamic -o $@ $(LDFLAGS) $(CONFIG_LIBS) $(LIBS))
+
+do_build_static_lib =				\
+	($(print_static_lib_build)		\
+	if [ -f $@ ]; then			\
+	    mv $@ $@.rm; $(RM) $@.rm;		\
+	fi;					\
+	$(AR) rcs $@ $^)
+
+do_compile_shared_library =			\
+	($(print_shared_lib_compile)		\
+	$(CC) --shared $^ '-Wl,-soname,$(1),-rpath=$$ORIGIN' -o $@ $(LDFLAGS) $(LIBS))
+
+do_compile_plugin_obj =				\
+	($(print_plugin_obj_compile)		\
+	$(CC) -c $(CPPFLAGS) $(CFLAGS) -fPIC -o $@ $<)
+
+do_plugin_build =				\
+	($(print_plugin_build)			\
+	$(CC) $(CFLAGS) $(LDFLAGS) -shared -nostartfiles -o $@ $<)
+
+do_compile_python_plugin_obj =			\
+	($(print_plugin_obj_compile)		\
+	$(CC) -c $(CPPFLAGS) $(CFLAGS) $(PYTHON_DIR_SQ) $(PYTHON_INCLUDES) -fPIC -o $@ $<)
+
+do_python_plugin_build =			\
+	($(print_plugin_build)			\
+	$(CC) $< -shared $(LDFLAGS) $(PYTHON_LDFLAGS) -o $@)
+
+do_clean =					\
+	($(print_clean)				\
+	$(RM) $1)
+
+do_sample_build =							\
+	$(Q)($(print_sample_build)					\
+	$(CC) -o $1 $2 $(CFLAGS) $(LIBTRACEEVENT_STATIC) -ldl)
+
+do_sample_obj =									\
+	$(Q)($(print_sample_obj)						\
+	$(CC) -g -Wall -c $(CFLAGS) -o $1 $2 -I../include/)
+
+#
+# Define a callable command for descending to a new directory
+#
+# Call by doing: $(call descend,directory[,target])
+#
+descend = \
+	($(print_descend)		\
+	mkdir -p $(obj)/$(BASE1); \
+	$(MAKE) $(PRINT_DIR) bdir=$(obj)/$(BASE1) -C $(1) $(2))
+
+descend_clean = \
+	$(MAKE) $(PRINT_DIR) bdir=$(obj)/$(BASE1) -C $(1) clean
+
+define make_version.h
+	(echo '/* This file is automatically generated. Do not modify. */';		\
+	echo \#define VERSION_CODE $(shell						\
+	expr $(VERSION) \* 256 + $(PATCHLEVEL));					\
+	echo '#define EXTRAVERSION ' $(EXTRAVERSION);					\
+	echo '#define VERSION_STRING "'$(VERSION).$(PATCHLEVEL).$(EXTRAVERSION)'"';	\
+	echo '#define FILE_VERSION '$(FILE_VERSION);					\
+	if [ -d $(src)/.git ]; then							\
+	  d=`git diff`;									\
+	  x="";										\
+	  if [ ! -z "$$d" ]; then x="+"; fi;						\
+	  echo '#define VERSION_GIT "'$(shell 						\
+		git log -1 --pretty=format:"%H" 2>/dev/null)$$x'"';			\
+	else										\
+	  echo '#define VERSION_GIT "not-a-git-repo"';					\
+	fi										\
+	) > $1
+endef
+
+define update_version.h
+	($(call make_version.h, $@.tmp);				\
+	if [ -r $@ ] && cmp -s $@ $@.tmp; then				\
+		rm -f $@.tmp;						\
+	else								\
+		$(print_update)						\
+		mv -f $@.tmp $@;					\
+	fi);
+endef
+
+define update_dir
+	(echo $1 > $@.tmp;	\
+	if [ -r $@ ] && cmp -s $@ $@.tmp; then				\
+		rm -f $@.tmp;						\
+	else								\
+		$(print_update)						\
+		mv -f $@.tmp $@;					\
+	fi);
+endef
+
+define build_prefix
+	(echo $1 > $@.tmp;	\
+	if [ -r $@ ] && cmp -s $@ $@.tmp; then				\
+		rm -f $@.tmp;						\
+	else								\
+		$(print_update)						\
+		mv -f $@.tmp $@;					\
+	fi);
+endef
+
+define do_install_mkdir
+	if [ ! -d '$(DESTDIR_SQ)$1' ]; then		\
+		$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1';	\
+	fi
+endef
+
+define do_install
+	$(print_install)				\
+	$(call do_install_mkdir,$2);			\
+	$(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR_SQ)$2'
+endef
+
+define do_install_pkgconfig_file
+	if [ -n "${pkgconfig_dir}" ]; then 					\
+		$(call do_install,$(PKG_CONFIG_FILE),$(pkgconfig_dir),644); 	\
+	else 									\
+		(echo Failed to locate pkg-config directory) 1>&2;		\
+	fi
+endef
diff --git a/src/Build b/src/Build
new file mode 100644
index 0000000..f9a5d79
--- /dev/null
+++ b/src/Build
@@ -0,0 +1,8 @@
+libtraceevent-y += event-parse.o
+libtraceevent-y += event-plugin.o
+libtraceevent-y += trace-seq.o
+libtraceevent-y += parse-filter.o
+libtraceevent-y += parse-utils.o
+libtraceevent-y += kbuffer-parse.o
+libtraceevent-y += tep_strerror.o
+libtraceevent-y += event-parse-api.o
diff --git a/src/Makefile b/src/Makefile
new file mode 100644
index 0000000..53bb570
--- /dev/null
+++ b/src/Makefile
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: LGPL-2.1
+
+include $(src)/scripts/utils.mk
+
+OBJS =
+OBJS += event-parse-api.o
+OBJS += event-parse.o
+OBJS += event-plugin.o
+OBJS += kbuffer-parse.o
+OBJS += parse-filter.o
+OBJS += parse-utils.o
+OBJS += tep_strerror.o
+OBJS += trace-seq.o
+
+OBJS := $(OBJS:%.o=$(bdir)/%.o)
+DEPS := $(OBJS:$(bdir)/%.o=$(bdir)/.%.d)
+
+$(bdir)/%.o: %.c
+	$(Q)$(call do_fpic_compile)
+
+$(LIBTRACEEVENT_STATIC): $(OBJS)
+	$(Q)$(call do_build_static_lib)
+
+$(LIBTRACEEVENT_SHARED): $(OBJS)
+	$(Q)$(call do_compile_shared_library,$(notdir $(LIBTRACEEVENT_SHARED_VERSION)))
+
+$(LIBTRACEEVENT_SHARED_VERSION): $(LIBTRACEEVENT_SHARED)
+	@ln -sf $(<F) $@
+
+$(LIBTRACEEVENT_SHARED_SO): $(LIBTRACEEVENT_SHARED_VERSION)
+	@ln -sf $(<F) $@
+
+libtraceevent.so: $(LIBTRACEEVENT_SHARED_SO)
+
+libtraceevent: $(libtraceevent-y)
+	$(Q)$(MAKE) $(build)=libtraceevent
+
+$(DEPS): $(bdir)/.%.d: %.c
+	$(Q)$(CC) -M -MT $(bdir)/$*.o $(CPPFLAGS) $(CFLAGS) $< > $@
+
+$(OBJS): $(bdir)/%.o : $(bdir)/.%.d
+
+$(OBJS): | $(bdir)
+$(DEPS): | $(bdir)
+
+clean:
+	$(Q)$(call do_clean,$(OBJS) $(DEPS))
+
+dep_includes := $(wildcard $(DEPS))
+
+ifneq ($(dep_includes),)
+  include $(dep_includes)
+endif
+
+.PHONY: $(LIBTRACEEVENT_SHARED_SO) $(LIBTRACEEVENT_STATIC)
diff --git a/src/event-parse-api.c b/src/event-parse-api.c
new file mode 100644
index 0000000..268a586
--- /dev/null
+++ b/src/event-parse-api.c
@@ -0,0 +1,362 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ *
+ */
+
+#include "event-parse.h"
+#include "event-parse-local.h"
+#include "event-utils.h"
+
+/**
+ * tep_get_event - returns the event with the given index
+ * @tep: a handle to the tep_handle
+ * @index: index of the requested event, in the range 0 .. nr_events
+ *
+ * This returns pointer to the element of the events array with the given index
+ * If @tep is NULL, or @index is not in the range 0 .. nr_events, NULL is returned.
+ */
+struct tep_event *tep_get_event(struct tep_handle *tep, int index)
+{
+	if (tep && tep->events && index < tep->nr_events)
+		return tep->events[index];
+
+	return NULL;
+}
+
+/**
+ * tep_get_first_event - returns the first event in the events array
+ * @tep: a handle to the tep_handle
+ *
+ * This returns pointer to the first element of the events array
+ * If @tep is NULL, NULL is returned.
+ */
+struct tep_event *tep_get_first_event(struct tep_handle *tep)
+{
+	return tep_get_event(tep, 0);
+}
+
+/**
+ * tep_get_events_count - get the number of defined events
+ * @tep: a handle to the tep_handle
+ *
+ * This returns number of elements in event array
+ * If @tep is NULL, 0 is returned.
+ */
+int tep_get_events_count(struct tep_handle *tep)
+{
+	if (tep)
+		return tep->nr_events;
+	return 0;
+}
+
+/**
+ * tep_get_events_count - get the number of defined events
+ * @tep: a handle to the tep_handle
+ *
+ * This returns number of elements in event array
+ * If @tep is NULL, 0 is returned.
+ */
+int tep_get_function_count(struct tep_handle *tep)
+{
+	if (tep)
+		return tep->func_count;
+	return 0;
+}
+
+/**
+ * tep_set_flag - set event parser flag
+ * @tep: a handle to the tep_handle
+ * @flag: flag, or combination of flags to be set
+ * can be any combination from enum tep_flag
+ *
+ * This sets a flag or combination of flags from enum tep_flag
+ */
+void tep_set_flag(struct tep_handle *tep, int flag)
+{
+	if (tep)
+		tep->flags |= flag;
+}
+
+/**
+ * tep_clear_flag - clear event parser flag
+ * @tep: a handle to the tep_handle
+ * @flag: flag to be cleared
+ *
+ * This clears a tep flag
+ */
+void tep_clear_flag(struct tep_handle *tep, enum tep_flag flag)
+{
+	if (tep)
+		tep->flags &= ~flag;
+}
+
+/**
+ * tep_test_flag - check the state of event parser flag
+ * @tep: a handle to the tep_handle
+ * @flag: flag to be checked
+ *
+ * This returns the state of the requested tep flag.
+ * Returns: true if the flag is set, false otherwise.
+ */
+bool tep_test_flag(struct tep_handle *tep, enum tep_flag flag)
+{
+	if (tep)
+		return tep->flags & flag;
+	return false;
+}
+
+__hidden unsigned short data2host2(struct tep_handle *tep, unsigned short data)
+{
+	unsigned short swap;
+
+	if (!tep || tep->host_bigendian == tep->file_bigendian)
+		return data;
+
+	swap = ((data & 0xffULL) << 8) |
+		((data & (0xffULL << 8)) >> 8);
+
+	return swap;
+}
+
+__hidden unsigned int data2host4(struct tep_handle *tep, unsigned int data)
+{
+	unsigned int swap;
+
+	if (!tep || tep->host_bigendian == tep->file_bigendian)
+		return data;
+
+	swap = ((data & 0xffULL) << 24) |
+		((data & (0xffULL << 8)) << 8) |
+		((data & (0xffULL << 16)) >> 8) |
+		((data & (0xffULL << 24)) >> 24);
+
+	return swap;
+}
+
+__hidden  unsigned long long
+data2host8(struct tep_handle *tep, unsigned long long data)
+{
+	unsigned long long swap;
+
+	if (!tep || tep->host_bigendian == tep->file_bigendian)
+		return data;
+
+	swap = ((data & 0xffULL) << 56) |
+		((data & (0xffULL << 8)) << 40) |
+		((data & (0xffULL << 16)) << 24) |
+		((data & (0xffULL << 24)) << 8) |
+		((data & (0xffULL << 32)) >> 8) |
+		((data & (0xffULL << 40)) >> 24) |
+		((data & (0xffULL << 48)) >> 40) |
+		((data & (0xffULL << 56)) >> 56);
+
+	return swap;
+}
+
+/**
+ * tep_get_header_page_size - get size of the header page
+ * @tep: a handle to the tep_handle
+ *
+ * This returns size of the header page
+ * If @tep is NULL, 0 is returned.
+ */
+int tep_get_header_page_size(struct tep_handle *tep)
+{
+	if (tep)
+		return tep->header_page_size_size;
+	return 0;
+}
+
+/**
+ * tep_get_header_timestamp_size - get size of the timestamp in the header page
+ * @tep: a handle to the tep_handle
+ *
+ * This returns size of the timestamp in the header page
+ * If @tep is NULL, 0 is returned.
+ */
+int tep_get_header_timestamp_size(struct tep_handle *tep)
+{
+	if (tep)
+		return tep->header_page_ts_size;
+	return 0;
+}
+
+/**
+ * tep_get_cpus - get the number of CPUs
+ * @tep: a handle to the tep_handle
+ *
+ * This returns the number of CPUs
+ * If @tep is NULL, 0 is returned.
+ */
+int tep_get_cpus(struct tep_handle *tep)
+{
+	if (tep)
+		return tep->cpus;
+	return 0;
+}
+
+/**
+ * tep_set_cpus - set the number of CPUs
+ * @tep: a handle to the tep_handle
+ *
+ * This sets the number of CPUs
+ */
+void tep_set_cpus(struct tep_handle *tep, int cpus)
+{
+	if (tep)
+		tep->cpus = cpus;
+}
+
+/**
+ * tep_get_long_size - get the size of a long integer on the traced machine
+ * @tep: a handle to the tep_handle
+ *
+ * This returns the size of a long integer on the traced machine
+ * If @tep is NULL, 0 is returned.
+ */
+int tep_get_long_size(struct tep_handle *tep)
+{
+	if (tep)
+		return tep->long_size;
+	return 0;
+}
+
+/**
+ * tep_set_long_size - set the size of a long integer on the traced machine
+ * @tep: a handle to the tep_handle
+ * @size: size, in bytes, of a long integer
+ *
+ * This sets the size of a long integer on the traced machine
+ */
+void tep_set_long_size(struct tep_handle *tep, int long_size)
+{
+	if (tep)
+		tep->long_size = long_size;
+}
+
+/**
+ * tep_get_page_size - get the size of a memory page on the traced machine
+ * @tep: a handle to the tep_handle
+ *
+ * This returns the size of a memory page on the traced machine
+ * If @tep is NULL, 0 is returned.
+ */
+int tep_get_page_size(struct tep_handle *tep)
+{
+	if (tep)
+		return tep->page_size;
+	return 0;
+}
+
+/**
+ * tep_set_page_size - set the size of a memory page on the traced machine
+ * @tep: a handle to the tep_handle
+ * @_page_size: size of a memory page, in bytes
+ *
+ * This sets the size of a memory page on the traced machine
+ */
+void tep_set_page_size(struct tep_handle *tep, int _page_size)
+{
+	if (tep)
+		tep->page_size = _page_size;
+}
+
+/**
+ * tep_get_sub_buffer_size - get the size of a trace buffer page
+ * @tep: a handle to the tep_handle
+ *
+ * This returns the size of a trace buffer page on the traced machine.
+ * If @tep is NULL then -1 is returned.
+ */
+int tep_get_sub_buffer_size(struct tep_handle *tep)
+{
+	if (!tep)
+		return -1;
+
+	return tep->header_page_data_size + tep->header_page_data_offset;
+}
+
+/**
+ * tep_is_file_bigendian - return the endian of the file
+ * @tep: a handle to the tep_handle
+ *
+ * This returns true if the file is in big endian order
+ * If @tep is NULL, false is returned.
+ */
+bool tep_is_file_bigendian(struct tep_handle *tep)
+{
+	if (tep)
+		return (tep->file_bigendian == TEP_BIG_ENDIAN);
+	return false;
+}
+
+/**
+ * tep_set_file_bigendian - set if the file is in big endian order
+ * @tep: a handle to the tep_handle
+ * @endian: non zero, if the file is in big endian order
+ *
+ * This sets if the file is in big endian order
+ */
+void tep_set_file_bigendian(struct tep_handle *tep, enum tep_endian endian)
+{
+	if (tep)
+		tep->file_bigendian = endian;
+}
+
+/**
+ * tep_is_local_bigendian - return the endian of the saved local machine
+ * @tep: a handle to the tep_handle
+ *
+ * This returns true if the saved local machine in @tep is big endian.
+ * If @tep is NULL, false is returned.
+ */
+bool tep_is_local_bigendian(struct tep_handle *tep)
+{
+	if (tep)
+		return (tep->host_bigendian == TEP_BIG_ENDIAN);
+	return 0;
+}
+
+/**
+ * tep_set_local_bigendian - set the stored local machine endian order
+ * @tep: a handle to the tep_handle
+ * @endian: non zero, if the local host has big endian order
+ *
+ * This sets the endian order for the local machine.
+ */
+void tep_set_local_bigendian(struct tep_handle *tep, enum tep_endian endian)
+{
+	if (tep)
+		tep->host_bigendian = endian;
+}
+
+/**
+ * tep_is_old_format - get if an old kernel is used
+ * @tep: a handle to the tep_handle
+ *
+ * This returns true, if an old kernel is used to generate the tracing events or
+ * false if a new kernel is used. Old kernels did not have header page info.
+ * If @tep is NULL, false is returned.
+ */
+bool tep_is_old_format(struct tep_handle *tep)
+{
+	if (tep)
+		return tep->old_format;
+	return false;
+}
+
+/**
+ * tep_set_test_filters - set a flag to test a filter string
+ * @tep: a handle to the tep_handle
+ * @test_filters: the new value of the test_filters flag
+ *
+ * This sets a flag to test a filter string. If this flag is set, when
+ * tep_filter_add_filter_str() API as called,it will print the filter string
+ * instead of adding it.
+ */
+void tep_set_test_filters(struct tep_handle *tep, int test_filters)
+{
+	if (tep)
+		tep->test_filters = test_filters;
+}
diff --git a/src/event-parse-local.h b/src/event-parse-local.h
new file mode 100644
index 0000000..c6bfc61
--- /dev/null
+++ b/src/event-parse-local.h
@@ -0,0 +1,127 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ *
+ */
+
+#ifndef _PARSE_EVENTS_INT_H
+#define _PARSE_EVENTS_INT_H
+
+struct tep_cmdline;
+struct cmdline_list;
+struct func_map;
+struct func_list;
+struct event_handler;
+struct func_resolver;
+struct tep_plugins_dir;
+
+#define __hidden __attribute__((visibility ("hidden")))
+
+struct tep_handle {
+	int ref_count;
+
+	int header_page_ts_offset;
+	int header_page_ts_size;
+	int header_page_size_offset;
+	int header_page_size_size;
+	int header_page_data_offset;
+	int header_page_data_size;
+	int header_page_overwrite;
+
+	enum tep_endian file_bigendian;
+	enum tep_endian host_bigendian;
+
+	int old_format;
+
+	int cpus;
+	int long_size;
+	int page_size;
+
+	struct tep_cmdline *cmdlines;
+	struct cmdline_list *cmdlist;
+	int cmdline_count;
+
+	struct func_map *func_map;
+	struct func_resolver *func_resolver;
+	struct func_list *funclist;
+	unsigned int func_count;
+
+	struct printk_map *printk_map;
+	struct printk_list *printklist;
+	unsigned int printk_count;
+
+	struct tep_event **events;
+	int nr_events;
+	struct tep_event **sort_events;
+	enum tep_event_sort_type last_type;
+
+	int type_offset;
+	int type_size;
+
+	int pid_offset;
+	int pid_size;
+
+	int pc_offset;
+	int pc_size;
+
+	int flags_offset;
+	int flags_size;
+
+	int ld_offset;
+	int ld_size;
+
+	int test_filters;
+
+	int flags;
+
+	struct tep_format_field *bprint_ip_field;
+	struct tep_format_field *bprint_fmt_field;
+	struct tep_format_field *bprint_buf_field;
+
+	struct event_handler *handlers;
+	struct tep_function_handler *func_handlers;
+
+	/* cache */
+	struct tep_event *last_event;
+
+	struct tep_plugins_dir *plugins_dir;
+
+	const char *input_buf;
+	unsigned long long input_buf_ptr;
+	unsigned long long input_buf_siz;
+};
+
+enum tep_print_parse_type {
+	PRINT_FMT_STRING,
+	PRINT_FMT_ARG_DIGIT,
+	PRINT_FMT_ARG_POINTER,
+	PRINT_FMT_ARG_STRING,
+};
+
+struct tep_print_parse {
+	struct tep_print_parse	*next;
+
+	char				*format;
+	int				ls;
+	enum tep_print_parse_type	type;
+	struct tep_print_arg		*arg;
+	struct tep_print_arg		*len_as_arg;
+};
+
+void free_tep_event(struct tep_event *event);
+void free_tep_format_field(struct tep_format_field *field);
+void free_tep_plugin_paths(struct tep_handle *tep);
+
+unsigned short data2host2(struct tep_handle *tep, unsigned short data);
+unsigned int data2host4(struct tep_handle *tep, unsigned int data);
+unsigned long long data2host8(struct tep_handle *tep, unsigned long long data);
+
+/* access to the internal parser */
+int peek_char(struct tep_handle *tep);
+void init_input_buf(struct tep_handle *tep, const char *buf, unsigned long long size);
+unsigned long long get_input_buf_ptr(struct tep_handle *tep);
+const char *get_input_buf(struct tep_handle *tep);
+enum tep_event_type read_token(struct tep_handle *tep, char **tok);
+void free_token(char *tok);
+
+#endif /* _PARSE_EVENTS_INT_H */
diff --git a/src/event-parse.c b/src/event-parse.c
new file mode 100644
index 0000000..e655087
--- /dev/null
+++ b/src/event-parse.c
@@ -0,0 +1,8592 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ *
+ *
+ *  The parts for function graph printing was taken and modified from the
+ *  Linux Kernel that were written by
+ *    - Copyright (C) 2009  Frederic Weisbecker,
+ *  Frederic Weisbecker gave his permission to relicense the code to
+ *  the Lesser General Public License.
+ */
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <ctype.h>
+#include <errno.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <limits.h>
+#include <linux/time64.h>
+
+#include <netinet/in.h>
+#include "event-parse.h"
+
+#include "event-parse-local.h"
+#include "event-utils.h"
+#include "trace-seq.h"
+
+static int is_flag_field;
+static int is_symbolic_field;
+
+static int show_warning = 1;
+
+#define do_warning(fmt, ...)				\
+	do {						\
+		if (show_warning)			\
+			tep_warning(fmt, ##__VA_ARGS__);\
+	} while (0)
+
+#define do_warning_event(event, fmt, ...)				\
+	do {								\
+		if (!show_warning)					\
+			continue;					\
+									\
+		if (event)						\
+			tep_warning("[%s:%s] " fmt, event->system,	\
+				    event->name, ##__VA_ARGS__);	\
+		else							\
+			tep_warning(fmt, ##__VA_ARGS__);		\
+	} while (0)
+
+/**
+ * init_input_buf - init buffer for parsing
+ * @buf: buffer to parse
+ * @size: the size of the buffer
+ *
+ * Initializes the internal buffer that tep_read_token() will parse.
+ */
+__hidden void init_input_buf(struct tep_handle *tep, const char *buf,
+		unsigned long long size)
+{
+	tep->input_buf = buf;
+	tep->input_buf_siz = size;
+	tep->input_buf_ptr = 0;
+}
+
+__hidden const char *get_input_buf(struct tep_handle *tep)
+{
+	return tep->input_buf;
+}
+
+__hidden unsigned long long get_input_buf_ptr(struct tep_handle *tep)
+{
+	return tep->input_buf_ptr;
+}
+
+struct event_handler {
+	struct event_handler		*next;
+	int				id;
+	const char			*sys_name;
+	const char			*event_name;
+	tep_event_handler_func		func;
+	void				*context;
+};
+
+struct func_params {
+	struct func_params	*next;
+	enum tep_func_arg_type	type;
+};
+
+struct tep_function_handler {
+	struct tep_function_handler	*next;
+	enum tep_func_arg_type		ret_type;
+	char				*name;
+	tep_func_handler		func;
+	struct func_params		*params;
+	int				nr_args;
+};
+
+static unsigned long long
+process_defined_func(struct trace_seq *s, void *data, int size,
+		     struct tep_event *event, struct tep_print_arg *arg);
+
+static void free_func_handle(struct tep_function_handler *func);
+
+void breakpoint(void)
+{
+	static int x;
+	x++;
+}
+
+static const char *get_event_type(enum tep_event_type type)
+{
+	switch (type) {
+	case TEP_EVENT_ERROR: return "ERROR";
+	case TEP_EVENT_NONE: return "NONE";
+	case TEP_EVENT_SPACE: return "SPACE";
+	case TEP_EVENT_NEWLINE: return "NEWLINE";
+	case TEP_EVENT_OP: return "OP";
+	case TEP_EVENT_DELIM: return "DELIM";
+	case TEP_EVENT_ITEM: return "ITEM";
+	case TEP_EVENT_DQUOTE: return "DQUOTE";
+	case TEP_EVENT_SQUOTE: return "SQUOTE";
+	}
+	return "(UNKNOWN)";
+}
+
+static struct tep_print_arg *alloc_arg(void)
+{
+	return calloc(1, sizeof(struct tep_print_arg));
+}
+
+struct tep_cmdline {
+	char *comm;
+	int pid;
+};
+
+static int cmdline_cmp(const void *a, const void *b)
+{
+	const struct tep_cmdline *ca = a;
+	const struct tep_cmdline *cb = b;
+
+	if (ca->pid < cb->pid)
+		return -1;
+	if (ca->pid > cb->pid)
+		return 1;
+
+	return 0;
+}
+
+/* Looking for where to place the key */
+static int cmdline_slot_cmp(const void *a, const void *b)
+{
+	const struct tep_cmdline *ca = a;
+	const struct tep_cmdline *cb = b;
+	const struct tep_cmdline *cb1 = cb + 1;
+
+	if (ca->pid < cb->pid)
+		return -1;
+
+	if (ca->pid > cb->pid) {
+		if (ca->pid <= cb1->pid)
+			return 0;
+		return 1;
+	}
+
+	return 0;
+}
+
+struct cmdline_list {
+	struct cmdline_list	*next;
+	char			*comm;
+	int			pid;
+};
+
+static int cmdline_init(struct tep_handle *tep)
+{
+	struct cmdline_list *cmdlist = tep->cmdlist;
+	struct cmdline_list *item;
+	struct tep_cmdline *cmdlines;
+	int i;
+
+	cmdlines = malloc(sizeof(*cmdlines) * tep->cmdline_count);
+	if (!cmdlines)
+		return -1;
+
+	i = 0;
+	while (cmdlist) {
+		cmdlines[i].pid = cmdlist->pid;
+		cmdlines[i].comm = cmdlist->comm;
+		i++;
+		item = cmdlist;
+		cmdlist = cmdlist->next;
+		free(item);
+	}
+
+	qsort(cmdlines, tep->cmdline_count, sizeof(*cmdlines), cmdline_cmp);
+
+	tep->cmdlines = cmdlines;
+	tep->cmdlist = NULL;
+
+	return 0;
+}
+
+static const char *find_cmdline(struct tep_handle *tep, int pid)
+{
+	const struct tep_cmdline *comm;
+	struct tep_cmdline key;
+
+	if (!pid)
+		return "<idle>";
+
+	if (!tep->cmdlines && cmdline_init(tep))
+		return "<not enough memory for cmdlines!>";
+
+	key.pid = pid;
+
+	comm = bsearch(&key, tep->cmdlines, tep->cmdline_count,
+		       sizeof(*tep->cmdlines), cmdline_cmp);
+
+	if (comm)
+		return comm->comm;
+	return "<...>";
+}
+
+/**
+ * tep_is_pid_registered - return if a pid has a cmdline registered
+ * @tep: a handle to the trace event parser context
+ * @pid: The pid to check if it has a cmdline registered with.
+ *
+ * Returns true if the pid has a cmdline mapped to it
+ * false otherwise.
+ */
+bool tep_is_pid_registered(struct tep_handle *tep, int pid)
+{
+	const struct tep_cmdline *comm;
+	struct tep_cmdline key;
+
+	if (!pid)
+		return true;
+
+	if (!tep->cmdlines && cmdline_init(tep))
+		return false;
+
+	key.pid = pid;
+
+	comm = bsearch(&key, tep->cmdlines, tep->cmdline_count,
+		       sizeof(*tep->cmdlines), cmdline_cmp);
+
+	if (comm)
+		return true;
+	return false;
+}
+
+/*
+ * If the command lines have been converted to an array, then
+ * we must add this pid. This is much slower than when cmdlines
+ * are added before the array is initialized.
+ */
+static int add_new_comm(struct tep_handle *tep,
+			const char *comm, int pid, bool override)
+{
+	struct tep_cmdline *cmdlines = tep->cmdlines;
+	struct tep_cmdline *cmdline;
+	struct tep_cmdline key;
+	char *new_comm;
+	int cnt;
+
+	if (!pid)
+		return 0;
+
+	/* avoid duplicates */
+	key.pid = pid;
+
+	cmdline = bsearch(&key, tep->cmdlines, tep->cmdline_count,
+			  sizeof(*tep->cmdlines), cmdline_cmp);
+	if (cmdline) {
+		if (!override) {
+			errno = EEXIST;
+			return -1;
+		}
+		new_comm = strdup(comm);
+		if (!new_comm) {
+			errno = ENOMEM;
+			return -1;
+		}
+		free(cmdline->comm);
+		cmdline->comm = new_comm;
+
+		return 0;
+	}
+
+	cmdlines = realloc(cmdlines, sizeof(*cmdlines) * (tep->cmdline_count + 1));
+	if (!cmdlines) {
+		errno = ENOMEM;
+		return -1;
+	}
+	tep->cmdlines = cmdlines;
+
+	key.comm = strdup(comm);
+	if (!key.comm) {
+		errno = ENOMEM;
+		return -1;
+	}
+
+	if (!tep->cmdline_count) {
+		/* no entries yet */
+		tep->cmdlines[0] = key;
+		tep->cmdline_count++;
+		return 0;
+	}
+
+	/* Now find where we want to store the new cmdline */
+	cmdline = bsearch(&key, tep->cmdlines, tep->cmdline_count - 1,
+			  sizeof(*tep->cmdlines), cmdline_slot_cmp);
+
+	cnt = tep->cmdline_count;
+	if (cmdline) {
+		/* cmdline points to the one before the spot we want */
+		cmdline++;
+		cnt -= cmdline - tep->cmdlines;
+
+	} else {
+		/* The new entry is either before or after the list */
+		if (key.pid > tep->cmdlines[tep->cmdline_count - 1].pid) {
+			tep->cmdlines[tep->cmdline_count++] = key;
+			return 0;
+		}
+		cmdline = &tep->cmdlines[0];
+	}
+	memmove(cmdline + 1, cmdline, (cnt * sizeof(*cmdline)));
+	*cmdline = key;
+
+	tep->cmdline_count++;
+
+	return 0;
+}
+
+static int _tep_register_comm(struct tep_handle *tep,
+			      const char *comm, int pid, bool override)
+{
+	struct cmdline_list *item;
+
+	if (tep->cmdlines)
+		return add_new_comm(tep, comm, pid, override);
+
+	item = malloc(sizeof(*item));
+	if (!item)
+		return -1;
+
+	if (comm)
+		item->comm = strdup(comm);
+	else
+		item->comm = strdup("<...>");
+	if (!item->comm) {
+		free(item);
+		return -1;
+	}
+	item->pid = pid;
+	item->next = tep->cmdlist;
+
+	tep->cmdlist = item;
+	tep->cmdline_count++;
+
+	return 0;
+}
+
+/**
+ * tep_register_comm - register a pid / comm mapping
+ * @tep: a handle to the trace event parser context
+ * @comm: the command line to register
+ * @pid: the pid to map the command line to
+ *
+ * This adds a mapping to search for command line names with
+ * a given pid. The comm is duplicated. If a command with the same pid
+ * already exist, -1 is returned and errno is set to EEXIST
+ */
+int tep_register_comm(struct tep_handle *tep, const char *comm, int pid)
+{
+	return _tep_register_comm(tep, comm, pid, false);
+}
+
+/**
+ * tep_override_comm - register a pid / comm mapping
+ * @tep: a handle to the trace event parser context
+ * @comm: the command line to register
+ * @pid: the pid to map the command line to
+ *
+ * This adds a mapping to search for command line names with
+ * a given pid. The comm is duplicated. If a command with the same pid
+ * already exist, the command string is udapted with the new one
+ */
+int tep_override_comm(struct tep_handle *tep, const char *comm, int pid)
+{
+	if (!tep->cmdlines && cmdline_init(tep)) {
+		errno = ENOMEM;
+		return -1;
+	}
+	return _tep_register_comm(tep, comm, pid, true);
+}
+
+/**
+ * tep_parse_saved_cmdlines - parse the comms from the saved_cmdlines file
+ * @tep: a handle to the trace event parser
+ * @buf: A string buffer that holds the content of saved_cmdlines and ends with '\0'
+ *
+ * This is a helper function to parse the comms in the tracefs saved_cmdlines
+ * file (stored in a string buffer) and load the comms into the @tep handler
+ * such that comm name matches an process ID (pid). This is used to show
+ * the names of the processes as the events only hold the pid.
+ *
+ * Returns 0 on success, and -1 on error.
+ */
+int tep_parse_saved_cmdlines(struct tep_handle *tep, const char *buf)
+{
+	char *copy;
+	char *comm;
+	char *line;
+	char *next = NULL;
+	int pid;
+	int ret = -1;
+	int n;
+
+	copy = strdup(buf);
+	if (!copy)
+		return -1;
+
+	line = strtok_r(copy, "\n", &next);
+	while (line) {
+		errno = 0;
+		n = sscanf(line, "%d %m[^\n]s", &pid, &comm);
+		if (errno || n != 2 || !comm)
+			goto out;
+		tep_register_comm(tep, comm, pid);
+		free(comm);
+		line = strtok_r(NULL, "\n", &next);
+	}
+	ret = 0;
+ out:
+	free(copy);
+	return ret;
+}
+
+struct func_map {
+	unsigned long long		addr;
+	char				*func;
+	char				*mod;
+};
+
+struct func_list {
+	struct func_list	*next;
+	unsigned long long	addr;
+	char			*func;
+	char			*mod;
+};
+
+static int func_cmp(const void *a, const void *b)
+{
+	const struct func_map *fa = a;
+	const struct func_map *fb = b;
+
+	if (fa->addr < fb->addr)
+		return -1;
+	if (fa->addr > fb->addr)
+		return 1;
+
+	return 0;
+}
+
+/*
+ * We are searching for a record in between, not an exact
+ * match.
+ */
+static int func_bcmp(const void *a, const void *b)
+{
+	const struct func_map *fa = a;
+	const struct func_map *fb = b;
+
+	if ((fa->addr == fb->addr) ||
+
+	    (fa->addr > fb->addr &&
+	     fa->addr < (fb+1)->addr))
+		return 0;
+
+	if (fa->addr < fb->addr)
+		return -1;
+
+	return 1;
+}
+
+static int func_map_init(struct tep_handle *tep)
+{
+	struct func_list *funclist;
+	struct func_list *item;
+	struct func_map *func_map;
+	int i;
+
+	func_map = malloc(sizeof(*func_map) * (tep->func_count + 1));
+	if (!func_map)
+		return -1;
+
+	funclist = tep->funclist;
+
+	i = 0;
+	while (funclist) {
+		func_map[i].func = funclist->func;
+		func_map[i].addr = funclist->addr;
+		func_map[i].mod = funclist->mod;
+		i++;
+		item = funclist;
+		funclist = funclist->next;
+		free(item);
+	}
+
+	qsort(func_map, tep->func_count, sizeof(*func_map), func_cmp);
+
+	/*
+	 * Add a special record at the end.
+	 */
+	func_map[tep->func_count].func = NULL;
+	func_map[tep->func_count].addr = 0;
+	func_map[tep->func_count].mod = NULL;
+
+	tep->func_map = func_map;
+	tep->funclist = NULL;
+
+	return 0;
+}
+
+static struct func_map *
+__find_func(struct tep_handle *tep, unsigned long long addr)
+{
+	struct func_map *func;
+	struct func_map key;
+
+	if (!tep->func_map)
+		func_map_init(tep);
+
+	key.addr = addr;
+
+	func = bsearch(&key, tep->func_map, tep->func_count,
+		       sizeof(*tep->func_map), func_bcmp);
+
+	return func;
+}
+
+struct func_resolver {
+	tep_func_resolver_t	*func;
+	void			*priv;
+	struct func_map		map;
+};
+
+/**
+ * tep_set_function_resolver - set an alternative function resolver
+ * @tep: a handle to the trace event parser context
+ * @resolver: function to be used
+ * @priv: resolver function private state.
+ *
+ * Some tools may have already a way to resolve kernel functions, allow them to
+ * keep using it instead of duplicating all the entries inside tep->funclist.
+ */
+int tep_set_function_resolver(struct tep_handle *tep,
+			      tep_func_resolver_t *func, void *priv)
+{
+	struct func_resolver *resolver = malloc(sizeof(*resolver));
+
+	if (resolver == NULL)
+		return -1;
+
+	resolver->func = func;
+	resolver->priv = priv;
+
+	free(tep->func_resolver);
+	tep->func_resolver = resolver;
+
+	return 0;
+}
+
+/**
+ * tep_reset_function_resolver - reset alternative function resolver
+ * @tep: a handle to the trace event parser context
+ *
+ * Stop using whatever alternative resolver was set, use the default
+ * one instead.
+ */
+void tep_reset_function_resolver(struct tep_handle *tep)
+{
+	free(tep->func_resolver);
+	tep->func_resolver = NULL;
+}
+
+static struct func_map *
+find_func(struct tep_handle *tep, unsigned long long addr)
+{
+	struct func_map *map;
+
+	if (!tep->func_resolver)
+		return __find_func(tep, addr);
+
+	map = &tep->func_resolver->map;
+	map->mod  = NULL;
+	map->addr = addr;
+	map->func = tep->func_resolver->func(tep->func_resolver->priv,
+					     &map->addr, &map->mod);
+	if (map->func == NULL)
+		return NULL;
+
+	return map;
+}
+
+/**
+ * tep_find_function_info - find a function by a given address
+ * @tep: a handle to the trace event parser context
+ * @addr: the address to find the function with
+ * @name: Return the name of the function (if found)
+ * @start: Return the start of the function (if found)
+ * @size: Return the size of the function (if found)
+ *
+ * Returns 1 if found, and 0 if it is not.
+ *  If found then @name will point to the name of the function.
+ *                @start: will contain the starting address of the function.
+ *                @size: will contain the size of the function.
+ */
+int tep_find_function_info(struct tep_handle *tep, unsigned long long addr,
+			   const char **name, unsigned long long *start,
+			   unsigned long *size)
+{
+	struct func_map *map;
+
+	map = find_func(tep, addr);
+	if (!map)
+		return 0;
+
+	if (name)
+		*name = map->func;
+	if (start)
+		*start = map->addr;
+	if (size) {
+		if (!tep->func_resolver)
+			*size = map[1].addr - map->addr;
+		else
+			*size = 0;
+	}
+
+	return 1;
+}
+
+/**
+ * tep_find_function - find a function by a given address
+ * @tep: a handle to the trace event parser context
+ * @addr: the address to find the function with
+ *
+ * Returns a pointer to the function stored that has the given
+ * address. Note, the address does not have to be exact, it
+ * will select the function that would contain the address.
+ */
+const char *tep_find_function(struct tep_handle *tep, unsigned long long addr)
+{
+	struct func_map *map;
+
+	map = find_func(tep, addr);
+	if (!map)
+		return NULL;
+
+	return map->func;
+}
+
+/**
+ * tep_find_function_address - find a function address by a given address
+ * @tep: a handle to the trace event parser context
+ * @addr: the address to find the function with
+ *
+ * Returns the address the function starts at. This can be used in
+ * conjunction with tep_find_function to print both the function
+ * name and the function offset.
+ */
+unsigned long long
+tep_find_function_address(struct tep_handle *tep, unsigned long long addr)
+{
+	struct func_map *map;
+
+	map = find_func(tep, addr);
+	if (!map)
+		return 0;
+
+	return map->addr;
+}
+
+/**
+ * tep_register_function - register a function with a given address
+ * @tep: a handle to the trace event parser context
+ * @function: the function name to register
+ * @addr: the address the function starts at
+ * @mod: the kernel module the function may be in (NULL for none)
+ *
+ * This registers a function name with an address and module.
+ * The @func passed in is duplicated.
+ */
+int tep_register_function(struct tep_handle *tep, char *func,
+			  unsigned long long addr, char *mod)
+{
+	struct func_list *item = malloc(sizeof(*item));
+
+	if (!item)
+		return -1;
+
+	item->next = tep->funclist;
+	item->func = strdup(func);
+	if (!item->func)
+		goto out_free;
+
+	if (mod) {
+		item->mod = strdup(mod);
+		if (!item->mod)
+			goto out_free_func;
+	} else
+		item->mod = NULL;
+	item->addr = addr;
+
+	tep->funclist = item;
+	tep->func_count++;
+
+	return 0;
+
+out_free_func:
+	free(item->func);
+	item->func = NULL;
+out_free:
+	free(item);
+	errno = ENOMEM;
+	return -1;
+}
+
+/**
+ * tep_parse_kallsyms - load functions from a read of /proc/kallsyms
+ * @tep: a handle to the trace event parser
+ * @kallsyms: A string buffer that holds the content of /proc/kallsyms and ends with '\0'
+ *
+ * This is a helper function to parse the Linux kernel /proc/kallsyms
+ * format (stored in a string buffer) and load the functions into
+ * the @tep handler such that function IP addresses can be mapped to
+ * their name when parsing events with %pS in the print format field.
+ *
+ * Returns 0 on success, and -1 on error.
+ */
+int tep_parse_kallsyms(struct tep_handle *tep, const char *kallsyms)
+{
+	unsigned long long addr;
+	char *copy;
+	char *func;
+	char *line;
+	char *next = NULL;
+	char *mod;
+	char ch;
+	int ret = -1;
+
+	copy = strdup(kallsyms);
+	if (!copy)
+		return -1;
+
+	line = strtok_r(copy, "\n", &next);
+	while (line) {
+		int func_start, func_end = 0;
+		int mod_start, mod_end = 0;
+		int n;
+
+		mod = NULL;
+		errno = 0;
+		n = sscanf(line, "%16llx %c %n%*s%n%*1[\t][%n%*s%n",
+			   &addr, &ch, &func_start, &func_end, &mod_start, &mod_end);
+		if (errno)
+			goto out;
+
+		if (n != 2 || !func_end) {
+			tep_warning("Failed to parse kallsyms n=%d func_end=%d",
+				    n, func_end);
+			goto out;
+		}
+
+		func = line + func_start;
+		/*
+		 * Hacks for
+		 *  - arm arch that adds a lot of bogus '$a' functions
+		 *  - x86-64 that reports per-cpu variable offsets as absolute
+		 */
+		if (func[0] != '$' && ch != 'A' && ch != 'a') {
+			line[func_end] = 0;
+			if (mod_end) {
+				mod = line + mod_start;
+				/* truncate the extra ']' */
+				line[mod_end - 1] = 0;
+			}
+			tep_register_function(tep, func, addr, mod);
+		}
+
+		line = strtok_r(NULL, "\n", &next);
+	}
+	free(line);
+	ret = 0;
+ out:
+	free(copy);
+
+	return ret;
+}
+
+/**
+ * tep_print_funcs - print out the stored functions
+ * @tep: a handle to the trace event parser context
+ *
+ * This prints out the stored functions.
+ */
+void tep_print_funcs(struct tep_handle *tep)
+{
+	int i;
+
+	if (!tep->func_map)
+		func_map_init(tep);
+
+	for (i = 0; i < (int)tep->func_count; i++) {
+		printf("%016llx %s",
+		       tep->func_map[i].addr,
+		       tep->func_map[i].func);
+		if (tep->func_map[i].mod)
+			printf(" [%s]\n", tep->func_map[i].mod);
+		else
+			printf("\n");
+	}
+}
+
+struct printk_map {
+	unsigned long long		addr;
+	char				*printk;
+};
+
+struct printk_list {
+	struct printk_list	*next;
+	unsigned long long	addr;
+	char			*printk;
+};
+
+static int printk_cmp(const void *a, const void *b)
+{
+	const struct printk_map *pa = a;
+	const struct printk_map *pb = b;
+
+	if (pa->addr < pb->addr)
+		return -1;
+	if (pa->addr > pb->addr)
+		return 1;
+
+	return 0;
+}
+
+static int printk_map_init(struct tep_handle *tep)
+{
+	struct printk_list *printklist;
+	struct printk_list *item;
+	struct printk_map *printk_map;
+	int i;
+
+	printk_map = malloc(sizeof(*printk_map) * (tep->printk_count + 1));
+	if (!printk_map)
+		return -1;
+
+	printklist = tep->printklist;
+
+	i = 0;
+	while (printklist) {
+		printk_map[i].printk = printklist->printk;
+		printk_map[i].addr = printklist->addr;
+		i++;
+		item = printklist;
+		printklist = printklist->next;
+		free(item);
+	}
+
+	qsort(printk_map, tep->printk_count, sizeof(*printk_map), printk_cmp);
+
+	tep->printk_map = printk_map;
+	tep->printklist = NULL;
+
+	return 0;
+}
+
+static struct printk_map *
+find_printk(struct tep_handle *tep, unsigned long long addr)
+{
+	struct printk_map *printk;
+	struct printk_map key;
+
+	if (!tep->printk_map && printk_map_init(tep))
+		return NULL;
+
+	key.addr = addr;
+
+	printk = bsearch(&key, tep->printk_map, tep->printk_count,
+			 sizeof(*tep->printk_map), printk_cmp);
+
+	return printk;
+}
+
+/**
+ * tep_register_print_string - register a string by its address
+ * @tep: a handle to the trace event parser context
+ * @fmt: the string format to register
+ * @addr: the address the string was located at
+ *
+ * This registers a string by the address it was stored in the kernel.
+ * The @fmt passed in is duplicated.
+ */
+int tep_register_print_string(struct tep_handle *tep, const char *fmt,
+			      unsigned long long addr)
+{
+	struct printk_list *item = malloc(sizeof(*item));
+	char *p;
+
+	if (!item)
+		return -1;
+
+	item->next = tep->printklist;
+	item->addr = addr;
+
+	/* Strip off quotes and '\n' from the end */
+	if (fmt[0] == '"')
+		fmt++;
+	item->printk = strdup(fmt);
+	if (!item->printk)
+		goto out_free;
+
+	p = item->printk + strlen(item->printk) - 1;
+	if (*p == '"')
+		*p = 0;
+
+	p -= 2;
+	if (strcmp(p, "\\n") == 0)
+		*p = 0;
+
+	tep->printklist = item;
+	tep->printk_count++;
+
+	return 0;
+
+out_free:
+	free(item);
+	errno = ENOMEM;
+	return -1;
+}
+
+/**
+ * tep_print_printk - print out the stored strings
+ * @tep: a handle to the trace event parser context
+ *
+ * This prints the string formats that were stored.
+ */
+void tep_print_printk(struct tep_handle *tep)
+{
+	int i;
+
+	if (!tep->printk_map)
+		printk_map_init(tep);
+
+	for (i = 0; i < (int)tep->printk_count; i++) {
+		printf("%016llx %s\n",
+		       tep->printk_map[i].addr,
+		       tep->printk_map[i].printk);
+	}
+}
+
+/**
+ * tep_parse_printk_formats - Parse the address to strings
+ * @tep: a handle to the trace event parser
+ * @buf: A string buffer that holds the content of printk_formats and ends with '\0'
+ *
+ * This is a helper function to parse the address to printk formats in
+ * the kernel. Some events use %s to a kernel address that holds a constant
+ * string. The printk_formats file has a mapping of these addresses to the
+ * strings that are in the kernel. This parses the content of that file
+ * and registers those strings and their addresses so that the parsing of
+ * events can display the string as the event only has the address of the string.
+ *
+ * Returns 0 on success, and -1 on error.
+ */
+int tep_parse_printk_formats(struct tep_handle *tep, const char *buf)
+{
+	unsigned long long addr;
+	char *addr_str;
+	char *printk;
+	char *copy;
+	char *line;
+	char *next;
+	char *fmt;
+	int ret = -1;
+
+	copy = strdup(buf);
+	if (!copy)
+		return -1;
+
+	line = strtok_r(copy, "\n", &next);
+	while (line) {
+		addr_str = strtok_r(line, ":", &fmt);
+		if (!addr_str) {
+			tep_warning("printk format with empty entry");
+			break;
+		}
+		addr = strtoull(addr_str, NULL, 16);
+		/* fmt still has a space, skip it */
+		printk = strdup(fmt+1);
+		if (!printk)
+			goto out;
+		line = strtok_r(NULL, "\n", &next);
+		tep_register_print_string(tep, printk, addr);
+		free(printk);
+	}
+	ret = 0;
+ out:
+	free(copy);
+	return ret;
+}
+
+static struct tep_event *alloc_event(void)
+{
+	return calloc(1, sizeof(struct tep_event));
+}
+
+static int add_event(struct tep_handle *tep, struct tep_event *event)
+{
+	int i;
+	struct tep_event **events = realloc(tep->events, sizeof(event) *
+					    (tep->nr_events + 1));
+	if (!events)
+		return -1;
+
+	tep->events = events;
+
+	for (i = 0; i < tep->nr_events; i++) {
+		if (tep->events[i]->id > event->id)
+			break;
+	}
+	if (i < tep->nr_events)
+		memmove(&tep->events[i + 1],
+			&tep->events[i],
+			sizeof(event) * (tep->nr_events - i));
+
+	tep->events[i] = event;
+	tep->nr_events++;
+
+	event->tep = tep;
+
+	return 0;
+}
+
+static int event_item_type(enum tep_event_type type)
+{
+	switch (type) {
+	case TEP_EVENT_ITEM ... TEP_EVENT_SQUOTE:
+		return 1;
+	case TEP_EVENT_ERROR ... TEP_EVENT_DELIM:
+	default:
+		return 0;
+	}
+}
+
+static void free_flag_sym(struct tep_print_flag_sym *fsym)
+{
+	struct tep_print_flag_sym *next;
+
+	while (fsym) {
+		next = fsym->next;
+		free(fsym->value);
+		free(fsym->str);
+		free(fsym);
+		fsym = next;
+	}
+}
+
+static void free_arg(struct tep_print_arg *arg)
+{
+	struct tep_print_arg *farg;
+
+	if (!arg)
+		return;
+
+	switch (arg->type) {
+	case TEP_PRINT_ATOM:
+		free(arg->atom.atom);
+		break;
+	case TEP_PRINT_FIELD:
+		free(arg->field.name);
+		break;
+	case TEP_PRINT_FLAGS:
+		free_arg(arg->flags.field);
+		free(arg->flags.delim);
+		free_flag_sym(arg->flags.flags);
+		break;
+	case TEP_PRINT_SYMBOL:
+		free_arg(arg->symbol.field);
+		free_flag_sym(arg->symbol.symbols);
+		break;
+	case TEP_PRINT_HEX:
+	case TEP_PRINT_HEX_STR:
+		free_arg(arg->hex.field);
+		free_arg(arg->hex.size);
+		break;
+	case TEP_PRINT_INT_ARRAY:
+		free_arg(arg->int_array.field);
+		free_arg(arg->int_array.count);
+		free_arg(arg->int_array.el_size);
+		break;
+	case TEP_PRINT_TYPE:
+		free(arg->typecast.type);
+		free_arg(arg->typecast.item);
+		break;
+	case TEP_PRINT_STRING:
+	case TEP_PRINT_BSTRING:
+		free(arg->string.string);
+		break;
+	case TEP_PRINT_BITMASK:
+	case TEP_PRINT_CPUMASK:
+		free(arg->bitmask.bitmask);
+		break;
+	case TEP_PRINT_DYNAMIC_ARRAY:
+	case TEP_PRINT_DYNAMIC_ARRAY_LEN:
+		free(arg->dynarray.index);
+		break;
+	case TEP_PRINT_OP:
+		free(arg->op.op);
+		free_arg(arg->op.left);
+		free_arg(arg->op.right);
+		break;
+	case TEP_PRINT_FUNC:
+		while (arg->func.args) {
+			farg = arg->func.args;
+			arg->func.args = farg->next;
+			free_arg(farg);
+		}
+		break;
+
+	case TEP_PRINT_NULL:
+	default:
+		break;
+	}
+
+	free(arg);
+}
+
+static enum tep_event_type get_type(int ch)
+{
+	if (ch == '\n')
+		return TEP_EVENT_NEWLINE;
+	if (isspace(ch))
+		return TEP_EVENT_SPACE;
+	if (isalnum(ch) || ch == '_')
+		return TEP_EVENT_ITEM;
+	if (ch == '\'')
+		return TEP_EVENT_SQUOTE;
+	if (ch == '"')
+		return TEP_EVENT_DQUOTE;
+	if (!isprint(ch))
+		return TEP_EVENT_NONE;
+	if (ch == '(' || ch == ')' || ch == ',')
+		return TEP_EVENT_DELIM;
+
+	return TEP_EVENT_OP;
+}
+
+static int __read_char(struct tep_handle *tep)
+{
+	if (tep->input_buf_ptr >= tep->input_buf_siz)
+		return -1;
+
+	return tep->input_buf[tep->input_buf_ptr++];
+}
+
+/**
+ * peek_char - peek at the next character that will be read
+ *
+ * Returns the next character read, or -1 if end of buffer.
+ */
+__hidden int peek_char(struct tep_handle *tep)
+{
+	if (tep->input_buf_ptr >= tep->input_buf_siz)
+		return -1;
+
+	return tep->input_buf[tep->input_buf_ptr];
+}
+
+static int extend_token(char **tok, char *buf, int size)
+{
+	char *newtok = realloc(*tok, size);
+
+	if (!newtok) {
+		free(*tok);
+		*tok = NULL;
+		return -1;
+	}
+
+	if (!*tok)
+		strcpy(newtok, buf);
+	else
+		strcat(newtok, buf);
+	*tok = newtok;
+
+	return 0;
+}
+
+static enum tep_event_type force_token(struct tep_handle *tep, const char *str,
+		char **tok);
+
+static enum tep_event_type __read_token(struct tep_handle *tep, char **tok)
+{
+	char buf[BUFSIZ];
+	int ch, last_ch, quote_ch, next_ch;
+	int i = 0;
+	int tok_size = 0;
+	enum tep_event_type type;
+
+	*tok = NULL;
+
+
+	ch = __read_char(tep);
+	if (ch < 0)
+		return TEP_EVENT_NONE;
+
+	type = get_type(ch);
+	if (type == TEP_EVENT_NONE)
+		return type;
+
+	buf[i++] = ch;
+
+	switch (type) {
+	case TEP_EVENT_NEWLINE:
+	case TEP_EVENT_DELIM:
+		if (asprintf(tok, "%c", ch) < 0)
+			return TEP_EVENT_ERROR;
+
+		return type;
+
+	case TEP_EVENT_OP:
+		switch (ch) {
+		case '-':
+			next_ch = peek_char(tep);
+			if (next_ch == '>') {
+				buf[i++] = __read_char(tep);
+				break;
+			}
+			/* fall through */
+		case '+':
+		case '|':
+		case '&':
+		case '>':
+		case '<':
+			last_ch = ch;
+			ch = peek_char(tep);
+			if (ch != last_ch)
+				goto test_equal;
+			buf[i++] = __read_char(tep);
+			switch (last_ch) {
+			case '>':
+			case '<':
+				goto test_equal;
+			default:
+				break;
+			}
+			break;
+		case '!':
+		case '=':
+			goto test_equal;
+		default: /* what should we do instead? */
+			break;
+		}
+		buf[i] = 0;
+		*tok = strdup(buf);
+		return type;
+
+ test_equal:
+		ch = peek_char(tep);
+		if (ch == '=')
+			buf[i++] = __read_char(tep);
+		goto out;
+
+	case TEP_EVENT_DQUOTE:
+	case TEP_EVENT_SQUOTE:
+		/* don't keep quotes */
+		i--;
+		quote_ch = ch;
+		last_ch = 0;
+ concat:
+		do {
+			if (i == (BUFSIZ - 1)) {
+				buf[i] = 0;
+				tok_size += BUFSIZ;
+
+				if (extend_token(tok, buf, tok_size) < 0)
+					return TEP_EVENT_NONE;
+				i = 0;
+			}
+			last_ch = ch;
+			ch = __read_char(tep);
+			buf[i++] = ch;
+			/* the '\' '\' will cancel itself */
+			if (ch == '\\' && last_ch == '\\')
+				last_ch = 0;
+			/* Break out if the file is corrupted and giving non print chars */
+			if (ch <= 0)
+				break;
+		} while ((ch != quote_ch && isprint(ch)) || last_ch == '\\' || ch == '\n');
+		/* remove the last quote */
+		i--;
+
+		if (ch <= 0)
+			type = TEP_EVENT_NONE;
+
+		/*
+		 * For strings (double quotes) check the next token.
+		 * If it is another string, concatinate the two.
+		 */
+		if (type == TEP_EVENT_DQUOTE) {
+			unsigned long long save_input_buf_ptr = tep->input_buf_ptr;
+
+			do {
+				ch = __read_char(tep);
+			} while (isspace(ch));
+			if (ch == '"')
+				goto concat;
+			tep->input_buf_ptr = save_input_buf_ptr;
+		}
+
+		goto out;
+
+	case TEP_EVENT_ERROR ... TEP_EVENT_SPACE:
+	case TEP_EVENT_ITEM:
+	default:
+		break;
+	}
+
+	while (get_type(peek_char(tep)) == type) {
+		if (i == (BUFSIZ - 1)) {
+			buf[i] = 0;
+			tok_size += BUFSIZ;
+
+			if (extend_token(tok, buf, tok_size) < 0)
+				return TEP_EVENT_NONE;
+			i = 0;
+		}
+		ch = __read_char(tep);
+		buf[i++] = ch;
+	}
+
+ out:
+	buf[i] = 0;
+	if (extend_token(tok, buf, tok_size + i + 1) < 0)
+		return TEP_EVENT_NONE;
+
+	if (type == TEP_EVENT_ITEM) {
+		/*
+		 * Older versions of the kernel has a bug that
+		 * creates invalid symbols and will break the mac80211
+		 * parsing. This is a work around to that bug.
+		 *
+		 * See Linux kernel commit:
+		 *  811cb50baf63461ce0bdb234927046131fc7fa8b
+		 */
+		if (strcmp(*tok, "LOCAL_PR_FMT") == 0) {
+			free(*tok);
+			*tok = NULL;
+			return force_token(tep, "\"%s\" ", tok);
+		} else if (strcmp(*tok, "STA_PR_FMT") == 0) {
+			free(*tok);
+			*tok = NULL;
+			return force_token(tep, "\" sta:%pM\" ", tok);
+		} else if (strcmp(*tok, "VIF_PR_FMT") == 0) {
+			free(*tok);
+			*tok = NULL;
+			return force_token(tep, "\" vif:%p(%d)\" ", tok);
+		}
+	}
+
+	return type;
+}
+
+static enum tep_event_type force_token(struct tep_handle *tep, const char *str,
+		char **tok)
+{
+	const char *save_input_buf;
+	unsigned long long save_input_buf_ptr;
+	unsigned long long save_input_buf_siz;
+	enum tep_event_type type;
+	
+	/* save off the current input pointers */
+	save_input_buf = tep->input_buf;
+	save_input_buf_ptr = tep->input_buf_ptr;
+	save_input_buf_siz = tep->input_buf_siz;
+
+	init_input_buf(tep, str, strlen(str));
+
+	type = __read_token(tep, tok);
+
+	/* reset back to original token */
+	tep->input_buf = save_input_buf;
+	tep->input_buf_ptr = save_input_buf_ptr;
+	tep->input_buf_siz = save_input_buf_siz;
+
+	return type;
+}
+
+/**
+ * free_token - free a token returned by tep_read_token
+ * @token: the token to free
+ */
+__hidden void free_token(char *tok)
+{
+	if (tok)
+		free(tok);
+}
+
+/**
+ * read_token - access to utilities to use the tep parser
+ * @tok: The token to return
+ *
+ * This will parse tokens from the string given by
+ * tep_init_data().
+ *
+ * Returns the token type.
+ */
+__hidden enum tep_event_type read_token(struct tep_handle *tep, char **tok)
+{
+	enum tep_event_type type;
+
+	for (;;) {
+		type = __read_token(tep, tok);
+		if (type != TEP_EVENT_SPACE)
+			return type;
+
+		free_token(*tok);
+	}
+
+	/* not reached */
+	*tok = NULL;
+	return TEP_EVENT_NONE;
+}
+
+/* no newline */
+static enum tep_event_type read_token_item(struct tep_handle *tep, char **tok)
+{
+	enum tep_event_type type;
+
+	for (;;) {
+		type = __read_token(tep, tok);
+		if (type != TEP_EVENT_SPACE && type != TEP_EVENT_NEWLINE)
+			return type;
+		free_token(*tok);
+		*tok = NULL;
+	}
+
+	/* not reached */
+	*tok = NULL;
+	return TEP_EVENT_NONE;
+}
+
+static int test_type(enum tep_event_type type, enum tep_event_type expect)
+{
+	if (type != expect) {
+		do_warning("Error: expected type %d (%s) but read %d (%s)",
+			   expect, get_event_type(expect),
+			   type, get_event_type(type));
+		return -1;
+	}
+	return 0;
+}
+
+static int test_type_token(enum tep_event_type type, const char *token,
+		    enum tep_event_type expect, const char *expect_tok)
+{
+	if (type != expect) {
+		do_warning("Error: expected type %d (%s) but read %d (%s)",
+			   expect, get_event_type(expect),
+			   type, get_event_type(type));
+		return -1;
+	}
+
+	if (strcmp(token, expect_tok) != 0) {
+		do_warning("Error: expected '%s' but read '%s'",
+		    expect_tok, token);
+		return -1;
+	}
+	return 0;
+}
+
+static int __read_expect_type(struct tep_handle *tep, enum tep_event_type expect,
+		char **tok, int newline_ok)
+{
+	enum tep_event_type type;
+
+	if (newline_ok)
+		type = read_token(tep, tok);
+	else
+		type = read_token_item(tep, tok);
+	return test_type(type, expect);
+}
+
+static int read_expect_type(struct tep_handle *tep, enum tep_event_type expect,
+		char **tok)
+{
+	return __read_expect_type(tep, expect, tok, 1);
+}
+
+static int __read_expected(struct tep_handle *tep, enum tep_event_type expect,
+		const char *str, int newline_ok)
+{
+	enum tep_event_type type;
+	char *token;
+	int ret;
+
+	if (newline_ok)
+		type = read_token(tep, &token);
+	else
+		type = read_token_item(tep, &token);
+
+	ret = test_type_token(type, token, expect, str);
+
+	free_token(token);
+
+	return ret;
+}
+
+static int read_expected(struct tep_handle *tep, enum tep_event_type expect,
+		const char *str)
+{
+	return __read_expected(tep, expect, str, 1);
+}
+
+static int read_expected_item(struct tep_handle *tep, enum tep_event_type expect,
+		const char *str)
+{
+	return __read_expected(tep, expect, str, 0);
+}
+
+static char *event_read_name(struct tep_handle *tep)
+{
+	char *token;
+
+	if (read_expected(tep, TEP_EVENT_ITEM, "name") < 0)
+		return NULL;
+
+	if (read_expected(tep, TEP_EVENT_OP, ":") < 0)
+		return NULL;
+
+	if (read_expect_type(tep, TEP_EVENT_ITEM, &token) < 0)
+		goto fail;
+
+	return token;
+
+ fail:
+	free_token(token);
+	return NULL;
+}
+
+static int event_read_id(struct tep_handle *tep)
+{
+	char *token;
+	int id;
+
+	if (read_expected_item(tep, TEP_EVENT_ITEM, "ID") < 0)
+		return -1;
+
+	if (read_expected(tep, TEP_EVENT_OP, ":") < 0)
+		return -1;
+
+	if (read_expect_type(tep, TEP_EVENT_ITEM, &token) < 0)
+		goto fail;
+
+	id = strtoul(token, NULL, 0);
+	free_token(token);
+	return id;
+
+ fail:
+	free_token(token);
+	return -1;
+}
+
+static int field_is_string(struct tep_format_field *field)
+{
+	if ((field->flags & TEP_FIELD_IS_ARRAY) &&
+	    (strstr(field->type, "char") || strstr(field->type, "u8") ||
+	     strstr(field->type, "s8")))
+		return 1;
+
+	return 0;
+}
+
+static int field_is_dynamic(struct tep_format_field *field)
+{
+	if (strncmp(field->type, "__data_loc", 10) == 0)
+		return 1;
+
+	return 0;
+}
+
+static int field_is_relative_dynamic(struct tep_format_field *field)
+{
+	if (strncmp(field->type, "__rel_loc", 9) == 0)
+		return 1;
+
+	return 0;
+}
+
+static int field_is_long(struct tep_format_field *field)
+{
+	/* includes long long */
+	if (strstr(field->type, "long"))
+		return 1;
+
+	return 0;
+}
+
+static unsigned int type_size(const char *name)
+{
+	/* This covers all TEP_FIELD_IS_STRING types. */
+	static struct {
+		const char *type;
+		unsigned int size;
+	} table[] = {
+		{ "u8",   1 },
+		{ "u16",  2 },
+		{ "u32",  4 },
+		{ "u64",  8 },
+		{ "s8",   1 },
+		{ "s16",  2 },
+		{ "s32",  4 },
+		{ "s64",  8 },
+		{ "char", 1 },
+		{ },
+	};
+	int i;
+
+	for (i = 0; table[i].type; i++) {
+		if (!strcmp(table[i].type, name))
+			return table[i].size;
+	}
+
+	return 0;
+}
+
+static int append(char **buf, const char *delim, const char *str)
+{
+	char *new_buf;
+
+	new_buf = realloc(*buf, strlen(*buf) + strlen(delim) + strlen(str) + 1);
+	if (!new_buf)
+		return -1;
+	strcat(new_buf, delim);
+	strcat(new_buf, str);
+	*buf = new_buf;
+	return 0;
+}
+
+static int event_read_fields(struct tep_handle *tep, struct tep_event *event,
+		struct tep_format_field **fields)
+{
+	struct tep_format_field *field = NULL;
+	enum tep_event_type type;
+	char *token;
+	char *last_token;
+	char *delim = " ";
+	int count = 0;
+	int ret;
+
+	do {
+		unsigned int size_dynamic = 0;
+
+		type = read_token(tep, &token);
+		if (type == TEP_EVENT_NEWLINE) {
+			free_token(token);
+			return count;
+		}
+
+		count++;
+
+		if (test_type_token(type, token, TEP_EVENT_ITEM, "field"))
+			goto fail;
+		free_token(token);
+
+		type = read_token(tep, &token);
+		/*
+		 * The ftrace fields may still use the "special" name.
+		 * Just ignore it.
+		 */
+		if (event->flags & TEP_EVENT_FL_ISFTRACE &&
+		    type == TEP_EVENT_ITEM && strcmp(token, "special") == 0) {
+			free_token(token);
+			type = read_token(tep, &token);
+		}
+
+		if (test_type_token(type, token, TEP_EVENT_OP, ":") < 0)
+			goto fail;
+
+		free_token(token);
+		if (read_expect_type(tep, TEP_EVENT_ITEM, &token) < 0)
+			goto fail;
+
+		last_token = token;
+
+		field = calloc(1, sizeof(*field));
+		if (!field)
+			goto fail;
+
+		field->event = event;
+
+		/* read the rest of the type */
+		for (;;) {
+			type = read_token(tep, &token);
+			if (type == TEP_EVENT_ITEM ||
+			    (type == TEP_EVENT_OP && strcmp(token, "*") == 0) ||
+			    /*
+			     * Some of the ftrace fields are broken and have
+			     * an illegal "." in them.
+			     */
+			    (event->flags & TEP_EVENT_FL_ISFTRACE &&
+			     type == TEP_EVENT_OP && strcmp(token, ".") == 0)) {
+
+				if (strcmp(token, "*") == 0)
+					field->flags |= TEP_FIELD_IS_POINTER;
+
+				if (field->type) {
+					ret = append(&field->type, delim, last_token);
+					free(last_token);
+					if (ret < 0)
+						goto fail;
+				} else
+					field->type = last_token;
+				last_token = token;
+				delim = " ";
+				continue;
+			}
+
+			/* Handle __attribute__((user)) */
+			if ((type == TEP_EVENT_DELIM) &&
+			    strcmp("__attribute__", last_token) == 0 &&
+			    token[0] == '(') {
+				int depth = 1;
+				int ret;
+
+				ret = append(&field->type, " ", last_token);
+				ret |= append(&field->type, "", "(");
+				if (ret < 0)
+					goto fail;
+
+				delim = " ";
+				while ((type = read_token(tep, &token)) != TEP_EVENT_NONE) {
+					if (type == TEP_EVENT_DELIM) {
+						if (token[0] == '(')
+							depth++;
+						else if (token[0] == ')')
+							depth--;
+						if (!depth)
+							break;
+						ret = append(&field->type, "", token);
+						delim = "";
+					} else {
+						ret = append(&field->type, delim, token);
+						delim = " ";
+					}
+					if (ret < 0)
+						goto fail;
+					free(last_token);
+					last_token = token;
+				}
+				continue;
+			}
+			break;
+		}
+
+		if (!field->type) {
+			do_warning_event(event, "%s: no type found", __func__);
+			goto fail;
+		}
+		field->name = field->alias = last_token;
+
+		if (test_type(type, TEP_EVENT_OP))
+			goto fail;
+
+		if (strcmp(token, "[") == 0) {
+			enum tep_event_type last_type = type;
+			char *brackets = token;
+
+			field->flags |= TEP_FIELD_IS_ARRAY;
+
+			type = read_token(tep, &token);
+
+			if (type == TEP_EVENT_ITEM)
+				field->arraylen = strtoul(token, NULL, 0);
+			else
+				field->arraylen = 0;
+
+		        while (strcmp(token, "]") != 0) {
+				const char *delim;
+
+				if (last_type == TEP_EVENT_ITEM &&
+				    type == TEP_EVENT_ITEM)
+					delim = " ";
+				else
+					delim = "";
+
+				last_type = type;
+
+				ret = append(&brackets, delim, token);
+				if (ret < 0) {
+					free(brackets);
+					goto fail;
+				}
+				/* We only care about the last token */
+				field->arraylen = strtoul(token, NULL, 0);
+				free_token(token);
+				type = read_token(tep, &token);
+				if (type == TEP_EVENT_NONE) {
+					free(brackets);
+					do_warning_event(event, "failed to find token");
+					goto fail;
+				}
+			}
+
+			free_token(token);
+
+			ret = append(&brackets, "", "]");
+			if (ret < 0) {
+				free(brackets);
+				goto fail_expect;
+			}
+
+			/* add brackets to type */
+
+			type = read_token(tep, &token);
+			/*
+			 * If the next token is not an OP, then it is of
+			 * the format: type [] item;
+			 */
+			if (type == TEP_EVENT_ITEM) {
+				ret = append(&field->type, " ", field->name);
+				if (ret < 0) {
+					free(brackets);
+					goto fail;
+				}
+				ret = append(&field->type, "", brackets);
+
+				size_dynamic = type_size(field->name);
+				free_token(field->name);
+				field->name = field->alias = token;
+				type = read_token(tep, &token);
+			} else {
+				ret = append(&field->type, "", brackets);
+				if (ret < 0) {
+					free(brackets);
+					goto fail;
+				}
+			}
+			free(brackets);
+		}
+
+		if (field_is_string(field))
+			field->flags |= TEP_FIELD_IS_STRING;
+		if (field_is_dynamic(field))
+			field->flags |= TEP_FIELD_IS_DYNAMIC;
+		if (field_is_relative_dynamic(field))
+			field->flags |= TEP_FIELD_IS_DYNAMIC | TEP_FIELD_IS_RELATIVE;
+		if (field_is_long(field))
+			field->flags |= TEP_FIELD_IS_LONG;
+
+		if (test_type_token(type, token,  TEP_EVENT_OP, ";"))
+			goto fail;
+		free_token(token);
+
+		if (read_expected(tep, TEP_EVENT_ITEM, "offset") < 0)
+			goto fail_expect;
+
+		if (read_expected(tep, TEP_EVENT_OP, ":") < 0)
+			goto fail_expect;
+
+		if (read_expect_type(tep, TEP_EVENT_ITEM, &token))
+			goto fail;
+		field->offset = strtoul(token, NULL, 0);
+		free_token(token);
+
+		if (read_expected(tep, TEP_EVENT_OP, ";") < 0)
+			goto fail_expect;
+
+		if (read_expected(tep, TEP_EVENT_ITEM, "size") < 0)
+			goto fail_expect;
+
+		if (read_expected(tep, TEP_EVENT_OP, ":") < 0)
+			goto fail_expect;
+
+		if (read_expect_type(tep, TEP_EVENT_ITEM, &token))
+			goto fail;
+		field->size = strtoul(token, NULL, 0);
+		free_token(token);
+
+		/*
+		 * The old data format before dynamic arrays had dynamic
+		 * strings defined with just a 2 byte offset (the length
+		 * is defined by the strlen() of the string. To process them
+		 * correctly, check if the field is dynamic and has a size of
+		 * 2 bytes. All current dynamic events have a size of 4.
+		 */
+		if ((field->flags & TEP_FIELD_IS_DYNAMIC) && field->size == 2)
+			field->flags |= TEP_FIELD_IS_STRING | TEP_FIELD_IS_ARRAY;
+
+		if (read_expected(tep, TEP_EVENT_OP, ";") < 0)
+			goto fail_expect;
+
+		type = read_token(tep, &token);
+		if (type != TEP_EVENT_NEWLINE) {
+			/* newer versions of the kernel have a "signed" type */
+			if (test_type_token(type, token, TEP_EVENT_ITEM, "signed"))
+				goto fail;
+
+			free_token(token);
+
+			if (read_expected(tep, TEP_EVENT_OP, ":") < 0)
+				goto fail_expect;
+
+			if (read_expect_type(tep, TEP_EVENT_ITEM, &token))
+				goto fail;
+
+			if (strtoul(token, NULL, 0))
+				field->flags |= TEP_FIELD_IS_SIGNED;
+
+			free_token(token);
+			if (read_expected(tep, TEP_EVENT_OP, ";") < 0)
+				goto fail_expect;
+
+			if (read_expect_type(tep, TEP_EVENT_NEWLINE, &token))
+				goto fail;
+		}
+
+		free_token(token);
+
+		if (field->flags & (TEP_FIELD_IS_ARRAY | TEP_FIELD_IS_DYNAMIC)) {
+			if (field->arraylen)
+				field->elementsize = field->size / field->arraylen;
+			else if (field->flags & TEP_FIELD_IS_DYNAMIC)
+				field->elementsize = size_dynamic;
+			else if (field->flags & TEP_FIELD_IS_STRING)
+				field->elementsize = 1;
+			else if (field->flags & TEP_FIELD_IS_LONG)
+				field->elementsize = event->tep ?
+						     event->tep->long_size :
+						     sizeof(long);
+		} else
+			field->elementsize = field->size;
+
+		*fields = field;
+		fields = &field->next;
+		field = NULL;
+
+	} while (1);
+
+	return 0;
+
+fail:
+	free_token(token);
+fail_expect:
+	if (field) {
+		free(field->type);
+		free(field->name);
+		free(field);
+	}
+	return -1;
+}
+
+static int event_read_format(struct tep_event *event)
+{
+	char *token;
+	int ret;
+
+	if (read_expected_item(event->tep, TEP_EVENT_ITEM, "format") < 0)
+		return -1;
+
+	if (read_expected(event->tep, TEP_EVENT_OP, ":") < 0)
+		return -1;
+
+	if (read_expect_type(event->tep, TEP_EVENT_NEWLINE, &token))
+		goto fail;
+	free_token(token);
+
+	ret = event_read_fields(event->tep, event, &event->format.common_fields);
+	if (ret < 0)
+		return ret;
+	event->format.nr_common = ret;
+
+	ret = event_read_fields(event->tep, event, &event->format.fields);
+	if (ret < 0)
+		return ret;
+	event->format.nr_fields = ret;
+
+	return 0;
+
+ fail:
+	free_token(token);
+	return -1;
+}
+
+static enum tep_event_type
+process_arg_token(struct tep_event *event, struct tep_print_arg *arg,
+		  char **tok, enum tep_event_type type);
+
+static enum tep_event_type
+process_arg(struct tep_event *event, struct tep_print_arg *arg, char **tok)
+{
+	enum tep_event_type type;
+	char *token;
+
+	type = read_token(event->tep, &token);
+	*tok = token;
+
+	return process_arg_token(event, arg, tok, type);
+}
+
+static enum tep_event_type
+process_op(struct tep_event *event, struct tep_print_arg *arg, char **tok);
+
+/*
+ * For __print_symbolic() and __print_flags, we need to completely
+ * evaluate the first argument, which defines what to print next.
+ */
+static enum tep_event_type
+process_field_arg(struct tep_event *event, struct tep_print_arg *arg, char **tok)
+{
+	enum tep_event_type type;
+
+	type = process_arg(event, arg, tok);
+
+	while (type == TEP_EVENT_OP) {
+		type = process_op(event, arg, tok);
+	}
+
+	return type;
+}
+
+static enum tep_event_type
+process_cond(struct tep_event *event, struct tep_print_arg *top, char **tok)
+{
+	struct tep_print_arg *arg, *left, *right;
+	enum tep_event_type type;
+	char *token = NULL;
+
+	arg = alloc_arg();
+	left = alloc_arg();
+	right = alloc_arg();
+
+	if (!arg || !left || !right) {
+		do_warning_event(event, "%s: not enough memory!", __func__);
+		/* arg will be freed at out_free */
+		free_arg(left);
+		free_arg(right);
+		goto out_free;
+	}
+
+	arg->type = TEP_PRINT_OP;
+	arg->op.left = left;
+	arg->op.right = right;
+
+	*tok = NULL;
+	type = process_arg(event, left, &token);
+
+ again:
+	if (type == TEP_EVENT_ERROR)
+		goto out_free;
+
+	/* Handle other operations in the arguments */
+	if (type == TEP_EVENT_OP && strcmp(token, ":") != 0) {
+		type = process_op(event, left, &token);
+		goto again;
+	}
+
+	if (test_type_token(type, token, TEP_EVENT_OP, ":"))
+		goto out_free;
+
+	arg->op.op = token;
+
+	type = process_arg(event, right, &token);
+
+	top->op.right = arg;
+
+	*tok = token;
+	return type;
+
+out_free:
+	/* Top may point to itself */
+	top->op.right = NULL;
+	free_token(token);
+	free_arg(arg);
+	return TEP_EVENT_ERROR;
+}
+
+static enum tep_event_type
+process_array(struct tep_event *event, struct tep_print_arg *top, char **tok)
+{
+	struct tep_print_arg *arg;
+	enum tep_event_type type;
+	char *token = NULL;
+
+	arg = alloc_arg();
+	if (!arg) {
+		do_warning_event(event, "%s: not enough memory!", __func__);
+		/* '*tok' is set to top->op.op.  No need to free. */
+		*tok = NULL;
+		return TEP_EVENT_ERROR;
+	}
+
+	*tok = NULL;
+	type = process_arg(event, arg, &token);
+	if (test_type_token(type, token, TEP_EVENT_OP, "]"))
+		goto out_free;
+
+	top->op.right = arg;
+
+	free_token(token);
+	type = read_token_item(event->tep, &token);
+	*tok = token;
+
+	return type;
+
+out_free:
+	free_token(token);
+	free_arg(arg);
+	return TEP_EVENT_ERROR;
+}
+
+static int get_op_prio(char *op)
+{
+	if (strlen(op) == 1) {
+		switch (op[0]) {
+		case '~':
+		case '!':
+			return 4;
+		case '*':
+		case '/':
+		case '%':
+			return 6;
+		case '+':
+		case '-':
+			return 7;
+			/* '>>' and '<<' are 8 */
+		case '<':
+		case '>':
+			return 9;
+			/* '==' and '!=' are 10 */
+		case '&':
+			return 11;
+		case '^':
+			return 12;
+		case '|':
+			return 13;
+		case '?':
+			return 16;
+		default:
+			do_warning("unknown op '%c'", op[0]);
+			return -1;
+		}
+	} else {
+		if (strcmp(op, "++") == 0 ||
+		    strcmp(op, "--") == 0) {
+			return 3;
+		} else if (strcmp(op, ">>") == 0 ||
+			   strcmp(op, "<<") == 0) {
+			return 8;
+		} else if (strcmp(op, ">=") == 0 ||
+			   strcmp(op, "<=") == 0) {
+			return 9;
+		} else if (strcmp(op, "==") == 0 ||
+			   strcmp(op, "!=") == 0) {
+			return 10;
+		} else if (strcmp(op, "&&") == 0) {
+			return 14;
+		} else if (strcmp(op, "||") == 0) {
+			return 15;
+		} else {
+			do_warning("unknown op '%s'", op);
+			return -1;
+		}
+	}
+}
+
+static int set_op_prio(struct tep_print_arg *arg)
+{
+
+	/* single ops are the greatest */
+	if (!arg->op.left || arg->op.left->type == TEP_PRINT_NULL)
+		arg->op.prio = 0;
+	else
+		arg->op.prio = get_op_prio(arg->op.op);
+
+	return arg->op.prio;
+}
+
+static int consolidate_op_arg(struct tep_print_arg *arg)
+{
+	unsigned long long val, left, right;
+	int ret = 0;
+
+	if (arg->type != TEP_PRINT_OP)
+		return 0;
+
+	if (arg->op.left)
+		ret = consolidate_op_arg(arg->op.left);
+	if (ret < 0)
+		return ret;
+
+	if (arg->op.right)
+		ret = consolidate_op_arg(arg->op.right);
+	if (ret < 0)
+		return ret;
+
+	if (!arg->op.left || !arg->op.right)
+		return 0;
+
+	if (arg->op.left->type != TEP_PRINT_ATOM ||
+	    arg->op.right->type != TEP_PRINT_ATOM)
+		return 0;
+
+	/* Two atoms, we can do the operation now. */
+	left = strtoull(arg->op.left->atom.atom, NULL, 0);
+	right = strtoull(arg->op.right->atom.atom, NULL, 0);
+
+	switch (arg->op.op[0]) {
+	case '>':
+		switch (arg->op.op[1]) {
+		case '>':
+			val = left >> right;
+			break;
+		case '=':
+			val = left >= right;
+			break;
+		default:
+			val = left > right;
+			break;
+		}
+		break;
+	case '<':
+		switch (arg->op.op[1]) {
+		case '<':
+			val = left << right;
+			break;
+		case '=':
+			val = left <= right;
+			break;
+		default:
+			val = left < right;
+			break;
+		}
+		break;
+	case '&':
+		switch (arg->op.op[1]) {
+		case '&':
+			val = left && right;
+			break;
+		default:
+			val = left & right;
+			break;
+		}
+		break;
+	case '|':
+		switch (arg->op.op[1]) {
+		case '|':
+			val = left || right;
+			break;
+		default:
+			val = left | right;
+			break;
+		}
+		break;
+	case '-':
+		val = left - right;
+		break;
+	case '+':
+		val = left + right;
+		break;
+	case '*':
+		val = left * right;
+		break;
+	case '^':
+		val = left ^ right;
+		break;
+	case '/':
+		val = left / right;
+		break;
+	case '%':
+		val = left % right;
+		break;
+	case '=':
+		/* Only '==' is called here */
+		val = left == right;
+		break;
+	case '!':
+		/* Only '!=' is called here. */
+		val = left != right;
+		break;
+	default:
+		return 0;
+	}
+
+	free_arg(arg->op.left);
+	free_arg(arg->op.right);
+
+	arg->type = TEP_PRINT_ATOM;
+	free(arg->op.op);
+	return asprintf(&arg->atom.atom, "%lld", val) < 0 ? -1 : 0;
+}
+
+/* Note, *tok does not get freed, but will most likely be saved */
+static enum tep_event_type
+process_op(struct tep_event *event, struct tep_print_arg *arg, char **tok)
+{
+	struct tep_print_arg *left, *right = NULL;
+	enum tep_event_type type;
+	char *token;
+
+	/* the op is passed in via tok */
+	token = *tok;
+
+	if (arg->type == TEP_PRINT_OP && !arg->op.left) {
+		/* handle single op */
+		switch (token[0]) {
+		case '~':
+		case '!':
+		case '+':
+		case '-':
+			break;
+		default:
+			do_warning_event(event, "bad op token %s", token);
+			goto out_free;
+
+		}
+		if (token[1]) {
+			do_warning_event(event, "bad op token %s", token);
+			goto out_free;
+		}
+
+		/* make an empty left */
+		left = alloc_arg();
+		if (!left)
+			goto out_warn_free;
+
+		left->type = TEP_PRINT_NULL;
+		arg->op.left = left;
+
+		right = alloc_arg();
+		if (!right)
+			goto out_warn_free;
+
+		arg->op.right = right;
+
+		/* do not free the token, it belongs to an op */
+		*tok = NULL;
+		type = process_arg(event, right, tok);
+
+	} else if (strcmp(token, "?") == 0) {
+
+		left = alloc_arg();
+		if (!left)
+			goto out_warn_free;
+
+		/* copy the top arg to the left */
+		*left = *arg;
+
+		arg->type = TEP_PRINT_OP;
+		arg->op.op = token;
+		arg->op.left = left;
+		arg->op.right = NULL;
+		arg->op.prio = 0;
+
+		/* it will set arg->op.right */
+		type = process_cond(event, arg, tok);
+
+	} else if (strcmp(token, ">>") == 0 ||
+		   strcmp(token, "<<") == 0 ||
+		   strcmp(token, "&") == 0 ||
+		   strcmp(token, "|") == 0 ||
+		   strcmp(token, "&&") == 0 ||
+		   strcmp(token, "||") == 0 ||
+		   strcmp(token, "-") == 0 ||
+		   strcmp(token, "+") == 0 ||
+		   strcmp(token, "*") == 0 ||
+		   strcmp(token, "^") == 0 ||
+		   strcmp(token, "/") == 0 ||
+		   strcmp(token, "%") == 0 ||
+		   strcmp(token, "<") == 0 ||
+		   strcmp(token, ">") == 0 ||
+		   strcmp(token, "<=") == 0 ||
+		   strcmp(token, ">=") == 0 ||
+		   strcmp(token, "==") == 0 ||
+		   strcmp(token, "!=") == 0) {
+
+		left = alloc_arg();
+		if (!left)
+			goto out_warn_free;
+
+		/* copy the top arg to the left */
+		*left = *arg;
+
+		arg->type = TEP_PRINT_OP;
+		arg->op.op = token;
+		arg->op.left = left;
+		arg->op.right = NULL;
+
+		if (set_op_prio(arg) == -1) {
+			event->flags |= TEP_EVENT_FL_FAILED;
+			/* arg->op.op (= token) will be freed at out_free */
+			arg->op.op = NULL;
+			goto out_free;
+		}
+
+		type = read_token_item(event->tep, &token);
+		*tok = token;
+
+		/* could just be a type pointer */
+		if ((strcmp(arg->op.op, "*") == 0) &&
+		    type == TEP_EVENT_DELIM && (strcmp(token, ")") == 0)) {
+			int ret;
+
+			if (left->type != TEP_PRINT_ATOM) {
+				do_warning_event(event, "bad pointer type");
+				goto out_free;
+			}
+			ret = append(&left->atom.atom, " ", "*");
+			if (ret < 0)
+				goto out_warn_free;
+
+			free(arg->op.op);
+			*arg = *left;
+			free(left);
+
+			return type;
+		}
+
+		right = alloc_arg();
+		if (!right)
+			goto out_warn_free;
+
+		type = process_arg_token(event, right, tok, type);
+		if (type == TEP_EVENT_ERROR) {
+			free_arg(right);
+			/* token was freed in process_arg_token() via *tok */
+			token = NULL;
+			goto out_free;
+		}
+
+		if (right->type == TEP_PRINT_OP &&
+		    get_op_prio(arg->op.op) < get_op_prio(right->op.op)) {
+			struct tep_print_arg tmp;
+
+			/* rotate ops according to the priority */
+			arg->op.right = right->op.left;
+
+			tmp = *arg;
+			*arg = *right;
+			*right = tmp;
+
+			arg->op.left = right;
+		} else {
+			arg->op.right = right;
+		}
+
+	} else if (strcmp(token, "[") == 0) {
+
+		left = alloc_arg();
+		if (!left)
+			goto out_warn_free;
+
+		*left = *arg;
+
+		arg->type = TEP_PRINT_OP;
+		arg->op.op = token;
+		arg->op.left = left;
+		arg->op.right = NULL;
+
+		arg->op.prio = 0;
+
+		/* it will set arg->op.right */
+		type = process_array(event, arg, tok);
+
+	} else {
+		do_warning_event(event, "unknown op '%s'", token);
+		event->flags |= TEP_EVENT_FL_FAILED;
+		/* the arg is now the left side */
+		goto out_free;
+	}
+
+	if (type == TEP_EVENT_OP && strcmp(*tok, ":") != 0) {
+		int prio;
+
+		/* higher prios need to be closer to the root */
+		prio = get_op_prio(*tok);
+
+		if (prio > arg->op.prio)
+			return process_op(event, arg, tok);
+
+		return process_op(event, right, tok);
+	}
+
+	return type;
+
+out_warn_free:
+	do_warning_event(event, "%s: not enough memory!", __func__);
+out_free:
+	free_token(token);
+	*tok = NULL;
+	return TEP_EVENT_ERROR;
+}
+
+static enum tep_event_type
+process_entry(struct tep_event *event __maybe_unused, struct tep_print_arg *arg,
+	      char **tok)
+{
+	enum tep_event_type type;
+	char *field;
+	char *token;
+
+	type = read_token_item(event->tep, &token);
+	/*
+	 * Check if REC happens to be surrounded by parenthesis, and
+	 * return if that's the case, as "(REC)->" is valid.
+	 * but return TEP_EVENT_ITEM.
+	 */
+	if (type == TEP_EVENT_DELIM && strcmp(token, ")") == 0) {
+		*tok = token;
+		return TEP_EVENT_ITEM;
+	}
+
+	if (test_type_token(type, token,  TEP_EVENT_OP, "->"))
+		goto out_free;
+
+	free_token(token);
+
+	if (read_expect_type(event->tep, TEP_EVENT_ITEM, &token) < 0)
+		goto out_free;
+	field = token;
+
+	arg->type = TEP_PRINT_FIELD;
+	arg->field.name = field;
+
+	arg->field.field = tep_find_any_field(event, arg->field.name);
+
+	if (is_flag_field) {
+		arg->field.field->flags |= TEP_FIELD_IS_FLAG;
+		is_flag_field = 0;
+	} else if (is_symbolic_field) {
+		arg->field.field->flags |= TEP_FIELD_IS_SYMBOLIC;
+		is_symbolic_field = 0;
+	}
+
+	type = read_token(event->tep, &token);
+	*tok = token;
+
+	return type;
+
+ out_free:
+	free_token(token);
+	*tok = NULL;
+	return TEP_EVENT_ERROR;
+}
+
+static int alloc_and_process_delim(struct tep_event *event, char *next_token,
+				   struct tep_print_arg **print_arg)
+{
+	struct tep_print_arg *field;
+	enum tep_event_type type;
+	char *token;
+	int ret = 0;
+
+	field = alloc_arg();
+	if (!field) {
+		do_warning_event(event, "%s: not enough memory!", __func__);
+		errno = ENOMEM;
+		return -1;
+	}
+
+	type = process_arg(event, field, &token);
+
+	/* We do allow operators */
+	if (type == TEP_EVENT_OP) {
+		type = process_op(event, field, &token);
+
+		if (consolidate_op_arg(field) < 0)
+			type = TEP_EVENT_ERROR;
+
+		if (type == TEP_EVENT_ERROR)
+			goto out_error;
+	}
+
+	if (test_type_token(type, token, TEP_EVENT_DELIM, next_token))
+		goto out_error;
+
+	*print_arg = field;
+
+out_free_token:
+	free_token(token);
+
+	return ret;
+out_error:
+	errno = EINVAL;
+	ret = -1;
+	free_arg(field);
+	goto out_free_token;
+}
+
+static char *arg_eval (struct tep_print_arg *arg);
+
+static unsigned long long
+eval_type_str(unsigned long long val, const char *type, int pointer)
+{
+	int sign = 0;
+	char *ref;
+	int len;
+
+	len = strlen(type);
+	if (len < 2) {
+		do_warning("invalid type: %s", type);
+		return val;
+	}
+
+	if (pointer) {
+
+		if (type[len-1] != '*') {
+			do_warning("pointer expected with non pointer type");
+			return val;
+		}
+
+		ref = malloc(len);
+		if (!ref) {
+			do_warning("%s: not enough memory!", __func__);
+			return val;
+		}
+		memcpy(ref, type, len);
+
+		/* chop off the " *" */
+		ref[len - 2] = 0;
+
+		val = eval_type_str(val, ref, 0);
+		free(ref);
+		return val;
+	}
+
+	/* check if this is a pointer */
+	if (type[len - 1] == '*')
+		return val;
+
+	/* Try to figure out the arg size*/
+	if (strncmp(type, "struct", 6) == 0)
+		/* all bets off */
+		return val;
+
+	if (strcmp(type, "u8") == 0)
+		return val & 0xff;
+
+	if (strcmp(type, "u16") == 0)
+		return val & 0xffff;
+
+	if (strcmp(type, "u32") == 0)
+		return val & 0xffffffff;
+
+	if (strcmp(type, "u64") == 0 ||
+	    strcmp(type, "s64") == 0)
+		return val;
+
+	if (strcmp(type, "s8") == 0)
+		return (unsigned long long)(char)val & 0xff;
+
+	if (strcmp(type, "s16") == 0)
+		return (unsigned long long)(short)val & 0xffff;
+
+	if (strcmp(type, "s32") == 0)
+		return (unsigned long long)(int)val & 0xffffffff;
+
+	if (strncmp(type, "unsigned ", 9) == 0) {
+		sign = 0;
+		type += 9;
+	}
+
+	if (strcmp(type, "char") == 0) {
+		if (sign)
+			return (unsigned long long)(char)val & 0xff;
+		else
+			return val & 0xff;
+	}
+
+	if (strcmp(type, "short") == 0) {
+		if (sign)
+			return (unsigned long long)(short)val & 0xffff;
+		else
+			return val & 0xffff;
+	}
+
+	if (strcmp(type, "int") == 0) {
+		if (sign)
+			return (unsigned long long)(int)val & 0xffffffff;
+		else
+			return val & 0xffffffff;
+	}
+
+	return val;
+}
+
+/*
+ * Try to figure out the type.
+ */
+static unsigned long long
+eval_type(unsigned long long val, struct tep_print_arg *arg, int pointer)
+{
+	if (arg->type != TEP_PRINT_TYPE) {
+		do_warning("expected type argument");
+		return 0;
+	}
+
+	return eval_type_str(val, arg->typecast.type, pointer);
+}
+
+static int arg_num_eval(struct tep_print_arg *arg, long long *val)
+{
+	long long left, right;
+	int ret = 1;
+
+	switch (arg->type) {
+	case TEP_PRINT_ATOM:
+		*val = strtoll(arg->atom.atom, NULL, 0);
+		break;
+	case TEP_PRINT_TYPE:
+		ret = arg_num_eval(arg->typecast.item, val);
+		if (!ret)
+			break;
+		*val = eval_type(*val, arg, 0);
+		break;
+	case TEP_PRINT_OP:
+		switch (arg->op.op[0]) {
+		case '|':
+			ret = arg_num_eval(arg->op.left, &left);
+			if (!ret)
+				break;
+			ret = arg_num_eval(arg->op.right, &right);
+			if (!ret)
+				break;
+			if (arg->op.op[1])
+				*val = left || right;
+			else
+				*val = left | right;
+			break;
+		case '&':
+			ret = arg_num_eval(arg->op.left, &left);
+			if (!ret)
+				break;
+			ret = arg_num_eval(arg->op.right, &right);
+			if (!ret)
+				break;
+			if (arg->op.op[1])
+				*val = left && right;
+			else
+				*val = left & right;
+			break;
+		case '<':
+			ret = arg_num_eval(arg->op.left, &left);
+			if (!ret)
+				break;
+			ret = arg_num_eval(arg->op.right, &right);
+			if (!ret)
+				break;
+			switch (arg->op.op[1]) {
+			case 0:
+				*val = left < right;
+				break;
+			case '<':
+				*val = left << right;
+				break;
+			case '=':
+				*val = left <= right;
+				break;
+			default:
+				do_warning("unknown op '%s'", arg->op.op);
+				ret = 0;
+			}
+			break;
+		case '>':
+			ret = arg_num_eval(arg->op.left, &left);
+			if (!ret)
+				break;
+			ret = arg_num_eval(arg->op.right, &right);
+			if (!ret)
+				break;
+			switch (arg->op.op[1]) {
+			case 0:
+				*val = left > right;
+				break;
+			case '>':
+				*val = left >> right;
+				break;
+			case '=':
+				*val = left >= right;
+				break;
+			default:
+				do_warning("unknown op '%s'", arg->op.op);
+				ret = 0;
+			}
+			break;
+		case '=':
+			ret = arg_num_eval(arg->op.left, &left);
+			if (!ret)
+				break;
+			ret = arg_num_eval(arg->op.right, &right);
+			if (!ret)
+				break;
+
+			if (arg->op.op[1] != '=') {
+				do_warning("unknown op '%s'", arg->op.op);
+				ret = 0;
+			} else
+				*val = left == right;
+			break;
+		case '!':
+			ret = arg_num_eval(arg->op.left, &left);
+			if (!ret)
+				break;
+			ret = arg_num_eval(arg->op.right, &right);
+			if (!ret)
+				break;
+
+			switch (arg->op.op[1]) {
+			case '=':
+				*val = left != right;
+				break;
+			default:
+				do_warning("unknown op '%s'", arg->op.op);
+				ret = 0;
+			}
+			break;
+		case '-':
+			/* check for negative */
+			if (arg->op.left->type == TEP_PRINT_NULL)
+				left = 0;
+			else
+				ret = arg_num_eval(arg->op.left, &left);
+			if (!ret)
+				break;
+			ret = arg_num_eval(arg->op.right, &right);
+			if (!ret)
+				break;
+			*val = left - right;
+			break;
+		case '+':
+			if (arg->op.left->type == TEP_PRINT_NULL)
+				left = 0;
+			else
+				ret = arg_num_eval(arg->op.left, &left);
+			if (!ret)
+				break;
+			ret = arg_num_eval(arg->op.right, &right);
+			if (!ret)
+				break;
+			*val = left + right;
+			break;
+		case '~':
+			ret = arg_num_eval(arg->op.right, &right);
+			if (!ret)
+				break;
+			*val = ~right;
+			break;
+		default:
+			do_warning("unknown op '%s'", arg->op.op);
+			ret = 0;
+		}
+		break;
+
+	case TEP_PRINT_NULL:
+	case TEP_PRINT_FIELD ... TEP_PRINT_SYMBOL:
+	case TEP_PRINT_STRING:
+	case TEP_PRINT_BSTRING:
+	case TEP_PRINT_BITMASK:
+	case TEP_PRINT_CPUMASK:
+	default:
+		do_warning("invalid eval type %d", arg->type);
+		ret = 0;
+
+	}
+	return ret;
+}
+
+static char *arg_eval (struct tep_print_arg *arg)
+{
+	long long val;
+	static char buf[24];
+
+	switch (arg->type) {
+	case TEP_PRINT_ATOM:
+		return arg->atom.atom;
+	case TEP_PRINT_TYPE:
+		return arg_eval(arg->typecast.item);
+	case TEP_PRINT_OP:
+		if (!arg_num_eval(arg, &val))
+			break;
+		sprintf(buf, "%lld", val);
+		return buf;
+
+	case TEP_PRINT_NULL:
+	case TEP_PRINT_FIELD ... TEP_PRINT_SYMBOL:
+	case TEP_PRINT_STRING:
+	case TEP_PRINT_BSTRING:
+	case TEP_PRINT_BITMASK:
+	case TEP_PRINT_CPUMASK:
+	default:
+		do_warning("invalid eval type %d", arg->type);
+		break;
+	}
+
+	return NULL;
+}
+
+static enum tep_event_type
+process_fields(struct tep_event *event, struct tep_print_flag_sym **list, char **tok)
+{
+	enum tep_event_type type;
+	struct tep_print_arg *arg = NULL;
+	struct tep_print_flag_sym *field;
+	char *token = *tok;
+	char *value;
+
+	do {
+		free_token(token);
+		type = read_token_item(event->tep, &token);
+		if (test_type_token(type, token, TEP_EVENT_OP, "{"))
+			break;
+
+		arg = alloc_arg();
+		if (!arg)
+			goto out_free;
+
+		free_token(token);
+		type = process_arg(event, arg, &token);
+
+		if (type == TEP_EVENT_OP)
+			type = process_op(event, arg, &token);
+
+		if (type == TEP_EVENT_ERROR)
+			goto out_free;
+
+		if (test_type_token(type, token, TEP_EVENT_DELIM, ","))
+			goto out_free;
+
+		field = calloc(1, sizeof(*field));
+		if (!field)
+			goto out_free;
+
+		value = arg_eval(arg);
+		if (value == NULL)
+			goto out_free_field;
+		field->value = strdup(value);
+		if (field->value == NULL)
+			goto out_free_field;
+
+		free_arg(arg);
+		arg = alloc_arg();
+		if (!arg)
+			goto out_free;
+
+		free_token(token);
+		type = process_arg(event, arg, &token);
+		if (test_type_token(type, token, TEP_EVENT_OP, "}"))
+			goto out_free_field;
+
+		value = arg_eval(arg);
+		if (value == NULL)
+			goto out_free_field;
+		field->str = strdup(value);
+		if (field->str == NULL)
+			goto out_free_field;
+		free_arg(arg);
+		arg = NULL;
+
+		*list = field;
+		list = &field->next;
+
+		free_token(token);
+		type = read_token_item(event->tep, &token);
+	} while (type == TEP_EVENT_DELIM && strcmp(token, ",") == 0);
+
+	*tok = token;
+	return type;
+
+out_free_field:
+	free_flag_sym(field);
+out_free:
+	free_arg(arg);
+	free_token(token);
+	*tok = NULL;
+
+	return TEP_EVENT_ERROR;
+}
+
+static enum tep_event_type
+process_flags(struct tep_event *event, struct tep_print_arg *arg, char **tok)
+{
+	struct tep_print_arg *field;
+	enum tep_event_type type;
+	char *token = NULL;
+
+	memset(arg, 0, sizeof(*arg));
+	arg->type = TEP_PRINT_FLAGS;
+
+	field = alloc_arg();
+	if (!field) {
+		do_warning_event(event, "%s: not enough memory!", __func__);
+		goto out_free;
+	}
+
+	type = process_field_arg(event, field, &token);
+
+	/* Handle operations in the first argument */
+	while (type == TEP_EVENT_OP)
+		type = process_op(event, field, &token);
+
+	if (test_type_token(type, token, TEP_EVENT_DELIM, ","))
+		goto out_free_field;
+	free_token(token);
+
+	arg->flags.field = field;
+
+	type = read_token_item(event->tep, &token);
+	if (event_item_type(type)) {
+		arg->flags.delim = token;
+		type = read_token_item(event->tep, &token);
+	}
+
+	if (test_type_token(type, token, TEP_EVENT_DELIM, ","))
+		goto out_free;
+
+	type = process_fields(event, &arg->flags.flags, &token);
+	if (test_type_token(type, token, TEP_EVENT_DELIM, ")"))
+		goto out_free;
+
+	free_token(token);
+	type = read_token_item(event->tep, tok);
+	return type;
+
+out_free_field:
+	free_arg(field);
+out_free:
+	free_token(token);
+	*tok = NULL;
+	return TEP_EVENT_ERROR;
+}
+
+static enum tep_event_type
+process_symbols(struct tep_event *event, struct tep_print_arg *arg, char **tok)
+{
+	struct tep_print_arg *field;
+	enum tep_event_type type;
+	char *token = NULL;
+
+	memset(arg, 0, sizeof(*arg));
+	arg->type = TEP_PRINT_SYMBOL;
+
+	field = alloc_arg();
+	if (!field) {
+		do_warning_event(event, "%s: not enough memory!", __func__);
+		goto out_free;
+	}
+
+	type = process_field_arg(event, field, &token);
+
+	if (test_type_token(type, token, TEP_EVENT_DELIM, ","))
+		goto out_free_field;
+
+	arg->symbol.field = field;
+
+	type = process_fields(event, &arg->symbol.symbols, &token);
+	if (test_type_token(type, token, TEP_EVENT_DELIM, ")"))
+		goto out_free;
+
+	free_token(token);
+	type = read_token_item(event->tep, tok);
+	return type;
+
+out_free_field:
+	free_arg(field);
+out_free:
+	free_token(token);
+	*tok = NULL;
+	return TEP_EVENT_ERROR;
+}
+
+static enum tep_event_type
+process_hex_common(struct tep_event *event, struct tep_print_arg *arg,
+		   char **tok, enum tep_print_arg_type type)
+{
+	memset(arg, 0, sizeof(*arg));
+	arg->type = type;
+
+	if (alloc_and_process_delim(event, ",", &arg->hex.field))
+		goto out;
+
+	if (alloc_and_process_delim(event, ")", &arg->hex.size))
+		goto free_field;
+
+	return read_token_item(event->tep, tok);
+
+free_field:
+	free_arg(arg->hex.field);
+	arg->hex.field = NULL;
+out:
+	*tok = NULL;
+	return TEP_EVENT_ERROR;
+}
+
+static enum tep_event_type
+process_hex(struct tep_event *event, struct tep_print_arg *arg, char **tok)
+{
+	return process_hex_common(event, arg, tok, TEP_PRINT_HEX);
+}
+
+static enum tep_event_type
+process_hex_str(struct tep_event *event, struct tep_print_arg *arg,
+		char **tok)
+{
+	return process_hex_common(event, arg, tok, TEP_PRINT_HEX_STR);
+}
+
+static enum tep_event_type
+process_int_array(struct tep_event *event, struct tep_print_arg *arg, char **tok)
+{
+	memset(arg, 0, sizeof(*arg));
+	arg->type = TEP_PRINT_INT_ARRAY;
+
+	if (alloc_and_process_delim(event, ",", &arg->int_array.field))
+		goto out;
+
+	if (alloc_and_process_delim(event, ",", &arg->int_array.count))
+		goto free_field;
+
+	if (alloc_and_process_delim(event, ")", &arg->int_array.el_size))
+		goto free_size;
+
+	return read_token_item(event->tep, tok);
+
+free_size:
+	free_arg(arg->int_array.count);
+	arg->int_array.count = NULL;
+free_field:
+	free_arg(arg->int_array.field);
+	arg->int_array.field = NULL;
+out:
+	*tok = NULL;
+	return TEP_EVENT_ERROR;
+}
+
+static enum tep_event_type
+process_dynamic_array(struct tep_event *event, struct tep_print_arg *arg, char **tok)
+{
+	struct tep_format_field *field;
+	enum tep_event_type type;
+	char *token;
+
+	memset(arg, 0, sizeof(*arg));
+	arg->type = TEP_PRINT_DYNAMIC_ARRAY;
+
+	/*
+	 * The item within the parenthesis is another field that holds
+	 * the index into where the array starts.
+	 */
+	type = read_token(event->tep, &token);
+	*tok = token;
+	if (type != TEP_EVENT_ITEM)
+		goto out_free;
+
+	/* Find the field */
+
+	field = tep_find_field(event, token);
+	if (!field)
+		goto out_free;
+
+	arg->dynarray.field = field;
+	arg->dynarray.index = 0;
+
+	if (read_expected(event->tep, TEP_EVENT_DELIM, ")") < 0)
+		goto out_free;
+
+	free_token(token);
+	type = read_token_item(event->tep, &token);
+	*tok = token;
+	if (type != TEP_EVENT_OP || strcmp(token, "[") != 0)
+		return type;
+
+	free_token(token);
+	arg = alloc_arg();
+	if (!arg) {
+		do_warning_event(event, "%s: not enough memory!", __func__);
+		*tok = NULL;
+		return TEP_EVENT_ERROR;
+	}
+
+	type = process_arg(event, arg, &token);
+	if (type == TEP_EVENT_ERROR)
+		goto out_free_arg;
+
+	if (!test_type_token(type, token, TEP_EVENT_OP, "]"))
+		goto out_free_arg;
+
+	free_token(token);
+	type = read_token_item(event->tep, tok);
+	return type;
+
+ out_free_arg:
+	free_arg(arg);
+ out_free:
+	free_token(token);
+	*tok = NULL;
+	return TEP_EVENT_ERROR;
+}
+
+static enum tep_event_type
+process_dynamic_array_len(struct tep_event *event, struct tep_print_arg *arg,
+			  char **tok)
+{
+	struct tep_format_field *field;
+	enum tep_event_type type;
+	char *token;
+
+	if (read_expect_type(event->tep, TEP_EVENT_ITEM, &token) < 0)
+		goto out_free;
+
+	arg->type = TEP_PRINT_DYNAMIC_ARRAY_LEN;
+
+	/* Find the field */
+	field = tep_find_field(event, token);
+	if (!field)
+		goto out_free;
+
+	arg->dynarray.field = field;
+	arg->dynarray.index = 0;
+
+	if (read_expected(event->tep, TEP_EVENT_DELIM, ")") < 0)
+		goto out_err;
+
+	free_token(token);
+	type = read_token(event->tep, &token);
+	*tok = token;
+
+	return type;
+
+ out_free:
+	free_token(token);
+ out_err:
+	*tok = NULL;
+	return TEP_EVENT_ERROR;
+}
+
+static enum tep_event_type
+process_paren(struct tep_event *event, struct tep_print_arg *arg, char **tok)
+{
+	struct tep_print_arg *item_arg;
+	enum tep_event_type type;
+	char *token;
+
+	type = process_arg(event, arg, &token);
+
+	if (type == TEP_EVENT_ERROR)
+		goto out_free;
+
+	if (type == TEP_EVENT_OP)
+		type = process_op(event, arg, &token);
+
+	if (type == TEP_EVENT_ERROR)
+		goto out_free;
+
+	/*
+	 * If REC is surrounded by parenthesis, the process_arg()
+	 * will return TEP_EVENT_ITEM with token == ")". In
+	 * this case, we need to continue processing the item
+	 * and return.
+	 */
+	if (type == TEP_EVENT_ITEM && strcmp(token, ")") == 0) {
+		free_token(token);
+		return process_entry(event, arg, tok);
+	}
+
+	if (test_type_token(type, token, TEP_EVENT_DELIM, ")"))
+		goto out_free;
+
+	free_token(token);
+	type = read_token_item(event->tep, &token);
+
+	/*
+	 * If the next token is an item or another open paren, then
+	 * this was a typecast.
+	 */
+	if (event_item_type(type) ||
+	    (type == TEP_EVENT_DELIM && strcmp(token, "(") == 0)) {
+
+		/* make this a typecast and contine */
+
+		/* prevous must be an atom */
+		if (arg->type != TEP_PRINT_ATOM) {
+			do_warning_event(event, "previous needed to be TEP_PRINT_ATOM");
+			goto out_free;
+		}
+
+		item_arg = alloc_arg();
+		if (!item_arg) {
+			do_warning_event(event, "%s: not enough memory!",
+					 __func__);
+			goto out_free;
+		}
+
+		arg->type = TEP_PRINT_TYPE;
+		arg->typecast.type = arg->atom.atom;
+		arg->typecast.item = item_arg;
+		type = process_arg_token(event, item_arg, &token, type);
+
+	}
+
+	*tok = token;
+	return type;
+
+ out_free:
+	free_token(token);
+	*tok = NULL;
+	return TEP_EVENT_ERROR;
+}
+
+
+static enum tep_event_type
+process_str(struct tep_event *event, struct tep_print_arg *arg, char **tok)
+{
+	enum tep_event_type type;
+	char *token;
+
+	if (read_expect_type(event->tep, TEP_EVENT_ITEM, &token) < 0)
+		goto out_free;
+
+	arg->type = TEP_PRINT_STRING;
+	arg->string.string = token;
+	arg->string.offset = -1;
+	arg->string.field = NULL;
+
+	if (read_expected(event->tep, TEP_EVENT_DELIM, ")") < 0)
+		goto out_err;
+
+	type = read_token(event->tep, &token);
+	*tok = token;
+
+	return type;
+
+ out_free:
+	free_token(token);
+ out_err:
+	*tok = NULL;
+	return TEP_EVENT_ERROR;
+}
+
+static enum tep_event_type
+process_bitmask(struct tep_event *event, struct tep_print_arg *arg, char **tok)
+{
+	enum tep_event_type type;
+	char *token;
+
+	if (read_expect_type(event->tep, TEP_EVENT_ITEM, &token) < 0)
+		goto out_free;
+
+	arg->type = TEP_PRINT_BITMASK;
+	arg->bitmask.bitmask = token;
+	arg->bitmask.offset = -1;
+	arg->bitmask.field = NULL;
+
+	if (read_expected(event->tep, TEP_EVENT_DELIM, ")") < 0)
+		goto out_err;
+
+	type = read_token(event->tep, &token);
+	*tok = token;
+
+	return type;
+
+ out_free:
+	free_token(token);
+ out_err:
+	*tok = NULL;
+	return TEP_EVENT_ERROR;
+}
+
+static enum tep_event_type
+process_cpumask(struct tep_event *event __maybe_unused, struct tep_print_arg *arg,
+		char **tok)
+{
+	enum tep_event_type type = process_bitmask(event, arg, tok);
+	if (type != TEP_EVENT_ERROR)
+		arg->type = TEP_PRINT_CPUMASK;
+
+	return type;
+}
+
+static struct tep_function_handler *
+find_func_handler(struct tep_handle *tep, char *func_name)
+{
+	struct tep_function_handler *func;
+
+	if (!tep)
+		return NULL;
+
+	for (func = tep->func_handlers; func; func = func->next) {
+		if (strcmp(func->name, func_name) == 0)
+			break;
+	}
+
+	return func;
+}
+
+static void remove_func_handler(struct tep_handle *tep, char *func_name)
+{
+	struct tep_function_handler *func;
+	struct tep_function_handler **next;
+
+	next = &tep->func_handlers;
+	while ((func = *next)) {
+		if (strcmp(func->name, func_name) == 0) {
+			*next = func->next;
+			free_func_handle(func);
+			break;
+		}
+		next = &func->next;
+	}
+}
+
+static enum tep_event_type
+process_func_handler(struct tep_event *event, struct tep_function_handler *func,
+		     struct tep_print_arg *arg, char **tok)
+{
+	struct tep_print_arg **next_arg;
+	struct tep_print_arg *farg;
+	enum tep_event_type type;
+	char *token;
+	int i;
+
+	arg->type = TEP_PRINT_FUNC;
+	arg->func.func = func;
+
+	*tok = NULL;
+
+	next_arg = &(arg->func.args);
+	for (i = 0; i < func->nr_args; i++) {
+		farg = alloc_arg();
+		if (!farg) {
+			do_warning_event(event, "%s: not enough memory!",
+					 __func__);
+			return TEP_EVENT_ERROR;
+		}
+
+		type = process_arg(event, farg, &token);
+		if (i < (func->nr_args - 1)) {
+			if (type != TEP_EVENT_DELIM || strcmp(token, ",") != 0) {
+				do_warning_event(event,
+					"Error: function '%s()' expects %d arguments but event %s only uses %d",
+					func->name, func->nr_args,
+					event->name, i + 1);
+				goto err;
+			}
+		} else {
+			if (type != TEP_EVENT_DELIM || strcmp(token, ")") != 0) {
+				do_warning_event(event,
+					"Error: function '%s()' only expects %d arguments but event %s has more",
+					func->name, func->nr_args, event->name);
+				goto err;
+			}
+		}
+
+		*next_arg = farg;
+		next_arg = &(farg->next);
+		free_token(token);
+	}
+
+	type = read_token(event->tep, &token);
+	*tok = token;
+
+	return type;
+
+err:
+	free_arg(farg);
+	free_token(token);
+	return TEP_EVENT_ERROR;
+}
+
+static enum tep_event_type
+process_builtin_expect(struct tep_event *event, struct tep_print_arg *arg, char **tok)
+{
+	enum tep_event_type type;
+	char *token = NULL;
+
+	/* Handle __builtin_expect( cond, #) */
+	type = process_arg(event, arg, &token);
+
+	if (type != TEP_EVENT_DELIM || token[0] != ',')
+		goto out_free;
+
+	free_token(token);
+
+	/* We don't care what the second parameter is of the __builtin_expect() */
+	if (read_expect_type(event->tep, TEP_EVENT_ITEM, &token) < 0)
+		goto out_free;
+
+	if (read_expected(event->tep, TEP_EVENT_DELIM, ")") < 0)
+		goto out_free;
+
+	free_token(token);
+	type = read_token_item(event->tep, tok);
+	return type;
+
+out_free:
+	free_token(token);
+	*tok = NULL;
+	return TEP_EVENT_ERROR;
+}
+
+static enum tep_event_type
+process_sizeof(struct tep_event *event, struct tep_print_arg *arg, char **tok)
+{
+	struct tep_format_field *field;
+	enum tep_event_type type;
+	char *token = NULL;
+	bool ok = false;
+	int ret;
+
+	type = read_token_item(event->tep, &token);
+
+	arg->type = TEP_PRINT_ATOM;
+
+	/* We handle some sizeof types */
+	if (strcmp(token, "unsigned") == 0) {
+		free_token(token);
+		type = read_token_item(event->tep, &token);
+
+		if (type == TEP_EVENT_ERROR)
+			goto error;
+
+		if (type != TEP_EVENT_ITEM)
+			ok = true;
+	}
+
+	if (ok || strcmp(token, "int") == 0) {
+		arg->atom.atom = strdup("4");
+
+	} else if (strcmp(token, "long") == 0) {
+		free_token(token);
+		type = read_token_item(event->tep, &token);
+
+		if (token && strcmp(token, "long") == 0) {
+			arg->atom.atom = strdup("8");
+		} else {
+			switch (event->tep->long_size) {
+			case 4:
+				arg->atom.atom = strdup("4");
+				break;
+			case 8:
+				arg->atom.atom = strdup("8");
+				break;
+			default:
+				/* long size not defined yet, fail to parse it */
+				goto error;
+			}
+			/* The token is the next token */
+			ok = true;
+		}
+	} else if (strcmp(token, "REC") == 0) {
+
+		free_token(token);
+		type = read_token_item(event->tep, &token);
+
+		if (test_type_token(type, token,  TEP_EVENT_OP, "->"))
+			goto error;
+		free_token(token);
+
+		if (read_expect_type(event->tep, TEP_EVENT_ITEM, &token) < 0)
+			goto error;
+
+		field = tep_find_any_field(event, token);
+		/* Can't handle arrays (yet) */
+		if (!field || field->flags & TEP_FIELD_IS_ARRAY)
+			goto error;
+
+		ret = asprintf(&arg->atom.atom, "%d", field->size);
+		if (ret < 0)
+			goto error;
+
+	} else if (!ok) {
+		goto error;
+	}
+
+	if (!ok) {
+		free_token(token);
+		type = read_token_item(event->tep, tok);
+	}
+	if (test_type_token(type, token,  TEP_EVENT_DELIM, ")"))
+		goto error;
+
+	free_token(token);
+	return read_token_item(event->tep, tok);
+error:
+	free_token(token);
+	*tok = NULL;
+	return TEP_EVENT_ERROR;
+}
+
+static enum tep_event_type
+process_function(struct tep_event *event, struct tep_print_arg *arg,
+		 char *token, char **tok)
+{
+	struct tep_function_handler *func;
+
+	if (strcmp(token, "__print_flags") == 0) {
+		free_token(token);
+		is_flag_field = 1;
+		return process_flags(event, arg, tok);
+	}
+	if (strcmp(token, "__print_symbolic") == 0) {
+		free_token(token);
+		is_symbolic_field = 1;
+		return process_symbols(event, arg, tok);
+	}
+	if (strcmp(token, "__print_hex") == 0) {
+		free_token(token);
+		return process_hex(event, arg, tok);
+	}
+	if (strcmp(token, "__print_hex_str") == 0) {
+		free_token(token);
+		return process_hex_str(event, arg, tok);
+	}
+	if (strcmp(token, "__print_array") == 0) {
+		free_token(token);
+		return process_int_array(event, arg, tok);
+	}
+	if (strcmp(token, "__get_str") == 0 ||
+	    strcmp(token, "__get_rel_str") == 0) {
+		free_token(token);
+		return process_str(event, arg, tok);
+	}
+	if (strcmp(token, "__get_bitmask") == 0 ||
+	    strcmp(token, "__get_rel_bitmask") == 0) {
+		free_token(token);
+		return process_bitmask(event, arg, tok);
+	}
+	if (strcmp(token, "__get_cpumask") == 0 ||
+	    strcmp(token, "__get_rel_cpumask") == 0) {
+		free_token(token);
+		return process_cpumask(event, arg, tok);
+	}
+	if (strcmp(token, "__get_dynamic_array") == 0 ||
+	    strcmp(token, "__get_rel_dynamic_array") == 0 ||
+	    strcmp(token, "__get_sockaddr") == 0 ||
+	    strcmp(token, "__get_sockaddr_rel") == 0) {
+		free_token(token);
+		return process_dynamic_array(event, arg, tok);
+	}
+	if (strcmp(token, "__get_dynamic_array_len") == 0 ||
+	    strcmp(token, "__get_rel_dynamic_array_len") == 0) {
+		free_token(token);
+		return process_dynamic_array_len(event, arg, tok);
+	}
+	if (strcmp(token, "__builtin_expect") == 0) {
+		free_token(token);
+		return process_builtin_expect(event, arg, tok);
+	}
+	if (strcmp(token, "sizeof") == 0) {
+		free_token(token);
+		return process_sizeof(event, arg, tok);
+	}
+
+	func = find_func_handler(event->tep, token);
+	if (func) {
+		free_token(token);
+		return process_func_handler(event, func, arg, tok);
+	}
+
+	do_warning_event(event, "function %s not defined", token);
+	free_token(token);
+	return TEP_EVENT_ERROR;
+}
+
+static enum tep_event_type
+process_arg_token(struct tep_event *event, struct tep_print_arg *arg,
+		  char **tok, enum tep_event_type type)
+{
+	char *token;
+	char *atom;
+
+	token = *tok;
+
+	switch (type) {
+	case TEP_EVENT_ITEM:
+		if (strcmp(token, "REC") == 0) {
+			free_token(token);
+			type = process_entry(event, arg, &token);
+			break;
+		}
+		atom = token;
+		/* test the next token */
+		type = read_token_item(event->tep, &token);
+
+		/*
+		 * If the next token is a parenthesis, then this
+		 * is a function.
+		 */
+		if (type == TEP_EVENT_DELIM && strcmp(token, "(") == 0) {
+			free_token(token);
+			token = NULL;
+			/* this will free atom. */
+			type = process_function(event, arg, atom, &token);
+			break;
+		}
+		/* atoms can be more than one token long */
+		while (type == TEP_EVENT_ITEM) {
+			int ret;
+
+			ret = append(&atom, " ", token);
+			if (ret < 0) {
+				free(atom);
+				*tok = NULL;
+				free_token(token);
+				return TEP_EVENT_ERROR;
+			}
+			free_token(token);
+			type = read_token_item(event->tep, &token);
+		}
+
+		arg->type = TEP_PRINT_ATOM;
+		arg->atom.atom = atom;
+		break;
+
+	case TEP_EVENT_DQUOTE:
+	case TEP_EVENT_SQUOTE:
+		arg->type = TEP_PRINT_ATOM;
+		arg->atom.atom = token;
+		type = read_token_item(event->tep, &token);
+		break;
+	case TEP_EVENT_DELIM:
+		if (strcmp(token, "(") == 0) {
+			free_token(token);
+			type = process_paren(event, arg, &token);
+			break;
+		}
+	case TEP_EVENT_OP:
+		/* handle single ops */
+		arg->type = TEP_PRINT_OP;
+		arg->op.op = token;
+		arg->op.left = NULL;
+		type = process_op(event, arg, &token);
+
+		/* On error, the op is freed */
+		if (type == TEP_EVENT_ERROR)
+			arg->op.op = NULL;
+
+		/* return error type if errored */
+		break;
+
+	case TEP_EVENT_ERROR ... TEP_EVENT_NEWLINE:
+	default:
+		do_warning_event(event, "unexpected type %d", type);
+		return TEP_EVENT_ERROR;
+	}
+	*tok = token;
+
+	return type;
+}
+
+static int event_read_print_args(struct tep_event *event, struct tep_print_arg **list)
+{
+	enum tep_event_type type = TEP_EVENT_ERROR;
+	struct tep_print_arg *arg;
+	char *token;
+	int args = 0;
+
+	do {
+		if (type == TEP_EVENT_NEWLINE) {
+			type = read_token_item(event->tep, &token);
+			continue;
+		}
+
+		arg = alloc_arg();
+		if (!arg) {
+			do_warning_event(event, "%s: not enough memory!",
+					 __func__);
+			return -1;
+		}
+
+		type = process_arg(event, arg, &token);
+
+		if (type == TEP_EVENT_ERROR) {
+			free_token(token);
+			free_arg(arg);
+			return -1;
+		}
+
+		*list = arg;
+		args++;
+
+		if (type == TEP_EVENT_OP) {
+			type = process_op(event, arg, &token);
+			free_token(token);
+
+			if (consolidate_op_arg(arg) < 0)
+				type = TEP_EVENT_ERROR;
+
+			if (type == TEP_EVENT_ERROR) {
+				*list = NULL;
+				free_arg(arg);
+				return -1;
+			}
+			list = &arg->next;
+			continue;
+		}
+
+		if (type == TEP_EVENT_DELIM && strcmp(token, ",") == 0) {
+			free_token(token);
+			*list = arg;
+			list = &arg->next;
+			continue;
+		}
+		break;
+	} while (type != TEP_EVENT_NONE);
+
+	if (type != TEP_EVENT_NONE && type != TEP_EVENT_ERROR)
+		free_token(token);
+
+	return args;
+}
+
+static int event_read_print(struct tep_event *event)
+{
+	enum tep_event_type type;
+	char *token;
+	int ret;
+
+	if (read_expected_item(event->tep, TEP_EVENT_ITEM, "print") < 0)
+		return -1;
+
+	if (read_expected(event->tep, TEP_EVENT_ITEM, "fmt") < 0)
+		return -1;
+
+	if (read_expected(event->tep, TEP_EVENT_OP, ":") < 0)
+		return -1;
+
+	if (read_expect_type(event->tep, TEP_EVENT_DQUOTE, &token) < 0)
+		goto fail;
+
+ concat:
+	event->print_fmt.format = token;
+	event->print_fmt.args = NULL;
+
+	/* ok to have no arg */
+	type = read_token_item(event->tep, &token);
+
+	if (type == TEP_EVENT_NONE)
+		return 0;
+
+	/* Handle concatenation of print lines */
+	if (type == TEP_EVENT_DQUOTE) {
+		char *cat;
+
+		if (asprintf(&cat, "%s%s", event->print_fmt.format, token) < 0)
+			goto fail;
+		free_token(token);
+		free_token(event->print_fmt.format);
+		event->print_fmt.format = NULL;
+		token = cat;
+		goto concat;
+	}
+			     
+	if (test_type_token(type, token, TEP_EVENT_DELIM, ","))
+		goto fail;
+
+	free_token(token);
+
+	ret = event_read_print_args(event, &event->print_fmt.args);
+	if (ret < 0)
+		return -1;
+
+	return ret;
+
+ fail:
+	free_token(token);
+	return -1;
+}
+
+/**
+ * tep_find_common_field - return a common field by event
+ * @event: handle for the event
+ * @name: the name of the common field to return
+ *
+ * Returns a common field from the event by the given @name.
+ * This only searches the common fields and not all field.
+ */
+struct tep_format_field *
+tep_find_common_field(struct tep_event *event, const char *name)
+{
+	struct tep_format_field *format;
+
+	for (format = event->format.common_fields;
+	     format; format = format->next) {
+		if (strcmp(format->name, name) == 0)
+			break;
+	}
+
+	return format;
+}
+
+/**
+ * tep_find_field - find a non-common field
+ * @event: handle for the event
+ * @name: the name of the non-common field
+ *
+ * Returns a non-common field by the given @name.
+ * This does not search common fields.
+ */
+struct tep_format_field *
+tep_find_field(struct tep_event *event, const char *name)
+{
+	struct tep_format_field *format;
+
+	for (format = event->format.fields;
+	     format; format = format->next) {
+		if (strcmp(format->name, name) == 0)
+			break;
+	}
+
+	return format;
+}
+
+/**
+ * tep_find_any_field - find any field by name
+ * @event: handle for the event
+ * @name: the name of the field
+ *
+ * Returns a field by the given @name.
+ * This searches the common field names first, then
+ * the non-common ones if a common one was not found.
+ */
+struct tep_format_field *
+tep_find_any_field(struct tep_event *event, const char *name)
+{
+	struct tep_format_field *format;
+
+	format = tep_find_common_field(event, name);
+	if (format)
+		return format;
+	return tep_find_field(event, name);
+}
+
+/**
+ * tep_read_number - read a number from data
+ * @tep: a handle to the trace event parser context
+ * @ptr: the raw data
+ * @size: the size of the data that holds the number
+ *
+ * Returns the number (converted to host) from the
+ * raw data.
+ */
+unsigned long long tep_read_number(struct tep_handle *tep,
+				   const void *ptr, int size)
+{
+	unsigned long long val;
+
+	switch (size) {
+	case 1:
+		return *(unsigned char *)ptr;
+	case 2:
+		return data2host2(tep, *(unsigned short *)ptr);
+	case 4:
+		return data2host4(tep, *(unsigned int *)ptr);
+	case 8:
+		memcpy(&val, (ptr), sizeof(unsigned long long));
+		return data2host8(tep, val);
+	default:
+		/* BUG! */
+		return 0;
+	}
+}
+
+/**
+ * tep_read_number_field - read a number from data
+ * @field: a handle to the field
+ * @data: the raw data to read
+ * @value: the value to place the number in
+ *
+ * Reads raw data according to a field offset and size,
+ * and translates it into @value.
+ *
+ * Returns 0 on success, -1 otherwise.
+ */
+int tep_read_number_field(struct tep_format_field *field, const void *data,
+			  unsigned long long *value)
+{
+	if (!field)
+		return -1;
+	switch (field->size) {
+	case 1:
+	case 2:
+	case 4:
+	case 8:
+		*value = tep_read_number(field->event->tep,
+					 data + field->offset, field->size);
+		return 0;
+	default:
+		return -1;
+	}
+}
+
+static int get_common_info(struct tep_handle *tep,
+			   const char *type, int *offset, int *size)
+{
+	struct tep_event *event;
+	struct tep_format_field *field;
+
+	/*
+	 * All events should have the same common elements.
+	 * Pick any event to find where the type is;
+	 */
+	if (!tep->events) {
+		do_warning("no event_list!");
+		return -1;
+	}
+
+	event = tep->events[0];
+	field = tep_find_common_field(event, type);
+	if (!field)
+		return -1;
+
+	*offset = field->offset;
+	*size = field->size;
+
+	return 0;
+}
+
+static int __parse_common(struct tep_handle *tep, void *data,
+			  int *size, int *offset, const char *name)
+{
+	int ret;
+
+	if (!*size) {
+		ret = get_common_info(tep, name, offset, size);
+		if (ret < 0)
+			return ret;
+	}
+	return tep_read_number(tep, data + *offset, *size);
+}
+
+static int trace_parse_common_type(struct tep_handle *tep, void *data)
+{
+	return __parse_common(tep, data,
+			      &tep->type_size, &tep->type_offset,
+			      "common_type");
+}
+
+static int parse_common_pid(struct tep_handle *tep, void *data)
+{
+	return __parse_common(tep, data,
+			      &tep->pid_size, &tep->pid_offset,
+			      "common_pid");
+}
+
+static int parse_common_pc(struct tep_handle *tep, void *data)
+{
+	return __parse_common(tep, data,
+			      &tep->pc_size, &tep->pc_offset,
+			      "common_preempt_count");
+}
+
+static int parse_common_flags(struct tep_handle *tep, void *data)
+{
+	return __parse_common(tep, data,
+			      &tep->flags_size, &tep->flags_offset,
+			      "common_flags");
+}
+
+static int parse_common_lock_depth(struct tep_handle *tep, void *data)
+{
+	return __parse_common(tep, data,
+			      &tep->ld_size, &tep->ld_offset,
+			      "common_lock_depth");
+}
+
+static int parse_common_migrate_disable(struct tep_handle *tep, void *data)
+{
+	return __parse_common(tep, data,
+			      &tep->ld_size, &tep->ld_offset,
+			      "common_migrate_disable");
+}
+
+static int events_id_cmp(const void *a, const void *b);
+
+/**
+ * tep_find_event - find an event by given id
+ * @tep: a handle to the trace event parser context
+ * @id: the id of the event
+ *
+ * Returns an event that has a given @id.
+ */
+struct tep_event *tep_find_event(struct tep_handle *tep, int id)
+{
+	struct tep_event **eventptr;
+	struct tep_event key;
+	struct tep_event *pkey = &key;
+
+	/* Check cache first */
+	if (tep->last_event && tep->last_event->id == id)
+		return tep->last_event;
+
+	key.id = id;
+
+	eventptr = bsearch(&pkey, tep->events, tep->nr_events,
+			   sizeof(*tep->events), events_id_cmp);
+
+	if (eventptr) {
+		tep->last_event = *eventptr;
+		return *eventptr;
+	}
+
+	return NULL;
+}
+
+/**
+ * tep_find_event_by_name - find an event by given name
+ * @tep: a handle to the trace event parser context
+ * @sys: the system name to search for
+ * @name: the name of the event to search for
+ *
+ * This returns an event with a given @name and under the system
+ * @sys. If @sys is NULL the first event with @name is returned.
+ */
+struct tep_event *
+tep_find_event_by_name(struct tep_handle *tep,
+		       const char *sys, const char *name)
+{
+	struct tep_event *event = NULL;
+	int i;
+
+	if (tep->last_event &&
+	    strcmp(tep->last_event->name, name) == 0 &&
+	    (!sys || strcmp(tep->last_event->system, sys) == 0))
+		return tep->last_event;
+
+	for (i = 0; i < tep->nr_events; i++) {
+		event = tep->events[i];
+		if (strcmp(event->name, name) == 0) {
+			if (!sys)
+				break;
+			if (strcmp(event->system, sys) == 0)
+				break;
+		}
+	}
+	if (i == tep->nr_events)
+		event = NULL;
+
+	tep->last_event = event;
+	return event;
+}
+
+static unsigned long long test_for_symbol(struct tep_handle *tep,
+					  struct tep_print_arg *arg)
+{
+	unsigned long long val = 0;
+	struct func_list *item = tep->funclist;
+	char *func;
+	int i;
+
+	if (isdigit(arg->atom.atom[0]))
+		return 0;
+
+	/* Linear search but only happens once (see after the loop) */
+	for (i = 0; i < (int)tep->func_count; i++) {
+		unsigned long long addr;
+		const char *name;
+
+		if (tep->func_map) {
+			addr = tep->func_map[i].addr;
+			name = tep->func_map[i].func;
+		} else if (item) {
+			addr = item->addr;
+			name = item->func;
+			item = item->next;
+		} else
+			break;
+
+		if (strcmp(arg->atom.atom, name) == 0) {
+			val = addr;
+			break;
+		}
+	}
+
+	/*
+	 * This modifies the arg to hardcode the value
+	 * and will not loop again.
+	 */
+	func = realloc(arg->atom.atom, 32);
+	if (func) {
+		snprintf(func, 32, "%lld", val);
+		arg->atom.atom = func;
+	}
+	return val;
+}
+
+#define TEP_OFFSET_LEN_MASK		0xffff
+#define TEP_LEN_SHIFT			16
+
+static void dynamic_offset(struct tep_handle *tep, int size, void *data,
+			   int data_size, unsigned int *offset, unsigned int *len)
+{
+	unsigned long long val;
+	unsigned int o, l;
+
+	/*
+	 * The total allocated length of the dynamic array is
+	 * stored in the top half of the field and the offset
+	 * is in the bottom half of the 32 bit field.
+	 */
+	val = tep_read_number(tep, data, size);
+
+	/* Check for overflows */
+	o = (unsigned int)(val & TEP_OFFSET_LEN_MASK);
+
+	/* If there's no length, then just make the length the size of the data */
+	if (size == 2)
+		l = data_size - o;
+	else
+		l = (unsigned int)((val >> TEP_LEN_SHIFT) & TEP_OFFSET_LEN_MASK);
+
+	if (offset)
+		*offset = o > data_size ? 0 : o;
+	if (len)
+		*len = o + l > data_size ? 0 : l;
+}
+
+static inline void dynamic_offset_field(struct tep_handle *tep,
+					struct tep_format_field *field,
+					void *data, int size,
+					unsigned int *offset,
+					unsigned int *len)
+{
+	/* Test for overflow */
+	if (field->offset + field->size > size) {
+		if (offset)
+			*offset = 0;
+		if (len)
+			*len = 0;
+		return;
+	}
+	dynamic_offset(tep, field->size, data + field->offset, size, offset, len);
+	if (field->flags & TEP_FIELD_IS_RELATIVE)
+		*offset += field->offset + field->size;
+}
+
+static bool check_data_offset_size(struct tep_event *event, const char *field_name,
+				    int data_size, int field_offset, int field_size)
+{
+	/* Check to make sure the field is within the data */
+	if (field_offset + field_size <= data_size)
+		return false;
+
+	tep_warning("Event '%s' field '%s' goes beyond the size of the event (%d > %d)",
+		    event->name, field_name, field_offset + field_size, data_size);
+	return true;
+}
+
+static unsigned long long
+eval_num_arg(void *data, int size, struct tep_event *event, struct tep_print_arg *arg)
+{
+	struct tep_handle *tep = event->tep;
+	unsigned long long val = 0;
+	unsigned long long left, right;
+	struct tep_print_arg *typearg = NULL;
+	struct tep_print_arg *larg;
+	unsigned int offset;
+	unsigned int field_size;
+
+	switch (arg->type) {
+	case TEP_PRINT_NULL:
+		/* ?? */
+		return 0;
+	case TEP_PRINT_ATOM:
+		val = strtoull(arg->atom.atom, NULL, 0);
+		if (!val)
+			val = test_for_symbol(tep, arg);
+		return val;
+	case TEP_PRINT_FIELD:
+		if (!arg->field.field) {
+			arg->field.field = tep_find_any_field(event, arg->field.name);
+			if (!arg->field.field)
+				goto out_warning_field;
+		}
+		if (check_data_offset_size(event, arg->field.name, size,
+					   arg->field.field->offset,
+					   arg->field.field->size)) {
+			val = 0;
+			break;
+		}
+		/* must be a number */
+		val = tep_read_number(tep, data + arg->field.field->offset,
+				      arg->field.field->size);
+		break;
+	case TEP_PRINT_FLAGS:
+	case TEP_PRINT_SYMBOL:
+	case TEP_PRINT_INT_ARRAY:
+	case TEP_PRINT_HEX:
+	case TEP_PRINT_HEX_STR:
+		break;
+	case TEP_PRINT_TYPE:
+		val = eval_num_arg(data, size, event, arg->typecast.item);
+		return eval_type(val, arg, 0);
+	case TEP_PRINT_STRING:
+	case TEP_PRINT_BSTRING:
+	case TEP_PRINT_BITMASK:
+	case TEP_PRINT_CPUMASK:
+		return 0;
+	case TEP_PRINT_FUNC: {
+		struct trace_seq s;
+		trace_seq_init(&s);
+		val = process_defined_func(&s, data, size, event, arg);
+		trace_seq_destroy(&s);
+		return val;
+	}
+	case TEP_PRINT_OP:
+		if (strcmp(arg->op.op, "[") == 0) {
+			/*
+			 * Arrays are special, since we don't want
+			 * to read the arg as is.
+			 */
+			right = eval_num_arg(data, size, event, arg->op.right);
+
+			/* handle typecasts */
+			larg = arg->op.left;
+			while (larg->type == TEP_PRINT_TYPE) {
+				if (!typearg)
+					typearg = larg;
+				larg = larg->typecast.item;
+			}
+
+			/* Default to long size */
+			field_size = tep->long_size;
+
+			switch (larg->type) {
+			case TEP_PRINT_DYNAMIC_ARRAY:
+				dynamic_offset_field(tep, larg->dynarray.field, data,
+						     size, &offset, NULL);
+				offset += right;
+				if (larg->dynarray.field->elementsize)
+					field_size = larg->dynarray.field->elementsize;
+				break;
+			case TEP_PRINT_FIELD:
+				if (!larg->field.field) {
+					larg->field.field =
+						tep_find_any_field(event, larg->field.name);
+					if (!larg->field.field) {
+						arg = larg;
+						goto out_warning_field;
+					}
+				}
+				field_size = larg->field.field->elementsize;
+				offset = larg->field.field->offset +
+					right * larg->field.field->elementsize;
+				break;
+			default:
+				goto default_op; /* oops, all bets off */
+			}
+			if (check_data_offset_size(event, arg->field.name, size,
+						   offset, field_size)) {
+				val = 0;
+				break;
+			}
+			val = tep_read_number(tep,
+					      data + offset, field_size);
+			if (typearg)
+				val = eval_type(val, typearg, 1);
+			break;
+		} else if (strcmp(arg->op.op, "?") == 0) {
+			left = eval_num_arg(data, size, event, arg->op.left);
+			arg = arg->op.right;
+			if (left)
+				val = eval_num_arg(data, size, event, arg->op.left);
+			else
+				val = eval_num_arg(data, size, event, arg->op.right);
+			break;
+		}
+ default_op:
+		left = eval_num_arg(data, size, event, arg->op.left);
+		right = eval_num_arg(data, size, event, arg->op.right);
+		switch (arg->op.op[0]) {
+		case '!':
+			switch (arg->op.op[1]) {
+			case 0:
+				val = !right;
+				break;
+			case '=':
+				val = left != right;
+				break;
+			default:
+				goto out_warning_op;
+			}
+			break;
+		case '~':
+			val = ~right;
+			break;
+		case '|':
+			if (arg->op.op[1])
+				val = left || right;
+			else
+				val = left | right;
+			break;
+		case '&':
+			if (arg->op.op[1])
+				val = left && right;
+			else
+				val = left & right;
+			break;
+		case '<':
+			switch (arg->op.op[1]) {
+			case 0:
+				val = left < right;
+				break;
+			case '<':
+				val = left << right;
+				break;
+			case '=':
+				val = left <= right;
+				break;
+			default:
+				goto out_warning_op;
+			}
+			break;
+		case '>':
+			switch (arg->op.op[1]) {
+			case 0:
+				val = left > right;
+				break;
+			case '>':
+				val = left >> right;
+				break;
+			case '=':
+				val = left >= right;
+				break;
+			default:
+				goto out_warning_op;
+			}
+			break;
+		case '=':
+			if (arg->op.op[1] != '=')
+				goto out_warning_op;
+
+			val = left == right;
+			break;
+		case '-':
+			val = left - right;
+			break;
+		case '+':
+			val = left + right;
+			break;
+		case '/':
+			val = left / right;
+			break;
+		case '%':
+			val = left % right;
+			break;
+		case '*':
+			val = left * right;
+			break;
+		default:
+			goto out_warning_op;
+		}
+		break;
+	case TEP_PRINT_DYNAMIC_ARRAY_LEN:
+		dynamic_offset_field(tep, arg->dynarray.field, data, size,
+				     NULL, &field_size);
+		val = field_size;
+		break;
+	case TEP_PRINT_DYNAMIC_ARRAY:
+		/* Without [], we pass the address to the dynamic data */
+		dynamic_offset_field(tep, arg->dynarray.field, data, size,
+				     &offset, NULL);
+		if (check_data_offset_size(event, arg->field.name, size,
+					   offset, 0)) {
+			val = (unsigned long)data;
+			break;
+		}
+		val = (unsigned long)data + offset;
+		break;
+	default: /* not sure what to do there */
+		return 0;
+	}
+	return val;
+
+out_warning_op:
+	do_warning_event(event, "%s: unknown op '%s'", __func__, arg->op.op);
+	return 0;
+
+out_warning_field:
+	do_warning_event(event, "%s: field %s not found",
+			 __func__, arg->field.name);
+	return 0;
+}
+
+struct flag {
+	const char *name;
+	unsigned long long value;
+};
+
+static const struct flag flags[] = {
+	{ "HI_SOFTIRQ", 0 },
+	{ "TIMER_SOFTIRQ", 1 },
+	{ "NET_TX_SOFTIRQ", 2 },
+	{ "NET_RX_SOFTIRQ", 3 },
+	{ "BLOCK_SOFTIRQ", 4 },
+	{ "IRQ_POLL_SOFTIRQ", 5 },
+	{ "TASKLET_SOFTIRQ", 6 },
+	{ "SCHED_SOFTIRQ", 7 },
+	{ "HRTIMER_SOFTIRQ", 8 },
+	{ "RCU_SOFTIRQ", 9 },
+
+	{ "HRTIMER_NORESTART", 0 },
+	{ "HRTIMER_RESTART", 1 },
+};
+
+static long long eval_flag(const char *flag)
+{
+	int i;
+
+	/*
+	 * Some flags in the format files do not get converted.
+	 * If the flag is not numeric, see if it is something that
+	 * we already know about.
+	 */
+	if (isdigit(flag[0]))
+		return strtoull(flag, NULL, 0);
+
+	for (i = 0; i < (int)(sizeof(flags)/sizeof(flags[0])); i++)
+		if (strcmp(flags[i].name, flag) == 0)
+			return flags[i].value;
+
+	return -1LL;
+}
+
+static void print_str_to_seq(struct trace_seq *s, const char *format,
+			     int len_arg, const char *str)
+{
+	if (len_arg >= 0)
+		trace_seq_printf(s, format, len_arg, str);
+	else
+		trace_seq_printf(s, format, str);
+}
+
+static void print_bitmask_to_seq(struct tep_handle *tep,
+				 struct trace_seq *s, const char *format,
+				 int len_arg, const void *data, int size)
+{
+	int nr_bits = size * 8;
+	int str_size = (nr_bits + 3) / 4;
+	int len = 0;
+	char buf[3];
+	char *str;
+	int index;
+	int i;
+
+	/*
+	 * The kernel likes to put in commas every 32 bits, we
+	 * can do the same.
+	 */
+	str_size += (nr_bits - 1) / 32;
+
+	str = malloc(str_size + 1);
+	if (!str) {
+		do_warning("%s: not enough memory!", __func__);
+		return;
+	}
+	str[str_size] = 0;
+
+	/* Start out with -2 for the two chars per byte */
+	for (i = str_size - 2; i >= 0; i -= 2) {
+		/*
+		 * data points to a bit mask of size bytes.
+		 * In the kernel, this is an array of long words, thus
+		 * endianness is very important.
+		 */
+		if (tep->file_bigendian)
+			index = size - (len + 1);
+		else
+			index = len;
+
+		snprintf(buf, 3, "%02x", *((unsigned char *)data + index));
+		memcpy(str + i, buf, 2);
+		len++;
+		if (!(len & 3) && i > 0) {
+			i--;
+			str[i] = ',';
+		}
+	}
+
+	if (len_arg >= 0)
+		trace_seq_printf(s, format, len_arg, str);
+	else
+		trace_seq_printf(s, format, str);
+
+	free(str);
+}
+
+#define log10(n)               \
+(			       \
+	n < 10UL ? 0 :	       \
+	n < 100UL ? 1 :	       \
+	n < 1000UL ? 2 :       \
+	n < 10000UL ? 3 :      \
+	n < 100000UL ? 4 :     \
+	n < 1000000UL ? 5 :    \
+	n < 10000000UL ? 6 :   \
+	n < 100000000UL ? 7 :  \
+	n < 1000000000UL ? 8 : \
+	9		       \
+)
+
+/* ilog10(0) should be 1 but the 0 simplifies below math */
+#define ilog10(n)    \
+(                     \
+	n == 0 ? 0UL : \
+	n == 1 ? 10UL : \
+	n == 2 ? 100UL : \
+	n == 3 ? 1000UL : \
+	n == 4 ? 10000UL : \
+	n == 5 ? 100000UL : \
+	n == 6 ? 1000000UL : \
+	n == 7 ? 10000000UL : \
+	n == 8 ? 100000000UL : \
+		 1000000000UL   \
+)
+
+static unsigned int cpumask_worst_size(unsigned int nr_bits)
+{
+	/*
+	 * Printing all the CPUs separated by a comma is a decent bound for the
+	 * maximum memory required to print a cpumask (a slightly better bound
+	 * is chunks of 2 bits set, i.e. 0-1,3-4,6-7...).
+	 *
+	 * e.g. for nr_bits=132:
+	 * - 131 commas
+	 * - 10 * 1 chars for CPUS [0, 9]
+	 * - 90 * 2 chars for CPUS [10-99]
+	 * - 32 * 3 chars for CPUS [100-131]
+	 */
+	unsigned int last_cpu = nr_bits - 1;
+	unsigned int nr_chars = nr_bits - 1;
+	int last_lvl = log10(last_cpu);
+
+	/* All log10 levels before the last one have all values used */
+	for (int lvl = 0; lvl < last_lvl; lvl++) {
+		int nr_values = ilog10(lvl + 1) - ilog10(lvl);
+
+		nr_chars += nr_values * (lvl + 1);
+	}
+	/* Last level is incomplete */
+	nr_chars += (nr_bits - ilog10(last_lvl)) * (last_lvl + 1);
+
+	return nr_chars;
+}
+
+static void print_cpumask_to_seq(struct tep_handle *tep,
+				 struct trace_seq *s, const char *format,
+				 int len_arg, const void *data, int size)
+{
+	int firstone = -1, firstzero = -1;
+	int nr_bits = size * 8;
+	bool first = true;
+	int str_size = 0;
+	char buf[12]; /* '-' + log10(2^32) + 1 digits + '\0' */
+	char *str;
+	int index;
+	int i;
+
+	str = malloc(cpumask_worst_size(nr_bits) + 1);
+	if (!str) {
+		do_warning("%s: not enough memory!", __func__);
+		return;
+	}
+
+	for (i = 0; i < size; i++) {
+		unsigned char byte;
+		int fmtsize;
+
+		if (tep->file_bigendian)
+			index = size - (i + 1);
+		else
+			index = i;
+
+		/* Byte by byte scan, not the best... */
+		byte = *(((unsigned char *)data) + index);
+more:
+		/* First find a bit set to one...*/
+		if (firstone < 0 && byte) {
+			/*
+			 * Set all lower bits, so a later ffz on this same byte
+			 * is guaranteed to find a later bit.
+			 */
+			firstone = ffs(byte) - 1;
+			byte |= (1 << firstone) - 1;
+			firstone += i * 8;
+		}
+
+		if (firstone < 0)
+			continue;
+
+		/* ...Then find a bit set to zero */
+		if ((~byte) & 0xFF) {
+			/*
+			 * Clear all lower bits, so a later ffs on this same
+			 * byte is guaranteed to find a later bit.
+			 */
+			firstzero = ffs(~byte) - 1;
+			byte &= ~((1 << (firstzero)) - 1);
+			firstzero += i * 8;
+		} else if (i == size - 1) { /* ...Or reach the end of the mask */
+			firstzero = nr_bits;
+			byte = 0;
+		} else {
+			continue;
+		}
+
+		/* We've found a bit set to one, and a later bit set to zero. */
+		if (!first) {
+			str[str_size] = ',';
+			str_size++;
+		}
+		first = false;
+
+		/* It takes {log10(number) + 1} chars to format a number */
+		fmtsize = log10(firstone) + 1;
+		snprintf(buf, fmtsize + 1, "%d", firstone);
+		memcpy(str + str_size, buf, fmtsize);
+		str_size += fmtsize;
+
+		if (firstzero > firstone + 1) {
+			fmtsize = log10(firstzero - 1) + 2;
+			snprintf(buf, fmtsize + 1, "-%d", firstzero - 1);
+			memcpy(str + str_size, buf, fmtsize);
+			str_size += fmtsize;
+		}
+
+		firstzero = firstone = -1;
+		if (byte)
+			goto more;
+	}
+
+	str[str_size] = 0;
+	str_size++;
+
+	if (len_arg >= 0)
+		trace_seq_printf(s, format, len_arg, str);
+	else
+		trace_seq_printf(s, format, str);
+
+	free(str);
+}
+
+static void print_str_arg(struct trace_seq *s, void *data, int size,
+			  struct tep_event *event, const char *format,
+			  int len_arg, struct tep_print_arg *arg)
+{
+	struct tep_handle *tep = event->tep;
+	struct tep_print_flag_sym *flag;
+	struct tep_format_field *field;
+	struct printk_map *printk;
+	unsigned int offset, len;
+	long long val, fval;
+	unsigned long long addr;
+	char *str;
+	unsigned char *hex;
+	int print;
+	int i;
+
+	switch (arg->type) {
+	case TEP_PRINT_NULL:
+		/* ?? */
+		return;
+	case TEP_PRINT_ATOM:
+		print_str_to_seq(s, format, len_arg, arg->atom.atom);
+		return;
+	case TEP_PRINT_FIELD:
+		field = arg->field.field;
+		if (!field) {
+			field = tep_find_any_field(event, arg->field.name);
+			if (!field) {
+				str = arg->field.name;
+				goto out_warning_field;
+			}
+			arg->field.field = field;
+		}
+		/* Zero sized fields, mean the rest of the data */
+		len = field->size ? : size - field->offset;
+
+		/*
+		 * Some events pass in pointers. If this is not an array
+		 * and the size is the same as long_size, assume that it
+		 * is a pointer.
+		 */
+		if (!(field->flags & TEP_FIELD_IS_ARRAY) &&
+		    field->size == tep->long_size) {
+
+			/* Handle heterogeneous recording and processing
+			 * architectures
+			 *
+			 * CASE I:
+			 * Traces recorded on 32-bit devices (32-bit
+			 * addressing) and processed on 64-bit devices:
+			 * In this case, only 32 bits should be read.
+			 *
+			 * CASE II:
+			 * Traces recorded on 64 bit devices and processed
+			 * on 32-bit devices:
+			 * In this case, 64 bits must be read.
+			 */
+			addr = (tep->long_size == 8) ?
+				*(unsigned long long *)(data + field->offset) :
+				(unsigned long long)*(unsigned int *)(data + field->offset);
+
+			/* Check if it matches a print format */
+			printk = find_printk(tep, addr);
+			if (printk)
+				trace_seq_puts(s, printk->printk);
+			else
+				trace_seq_printf(s, "%llx", addr);
+			break;
+		}
+		str = malloc(len + 1);
+		if (!str) {
+			do_warning_event(event, "%s: not enough memory!",
+					 __func__);
+			return;
+		}
+		memcpy(str, data + field->offset, len);
+		str[len] = 0;
+		print_str_to_seq(s, format, len_arg, str);
+		free(str);
+		break;
+	case TEP_PRINT_FLAGS:
+		val = eval_num_arg(data, size, event, arg->flags.field);
+		print = 0;
+		for (flag = arg->flags.flags; flag; flag = flag->next) {
+			fval = eval_flag(flag->value);
+			if (!val && fval < 0) {
+				print_str_to_seq(s, format, len_arg, flag->str);
+				break;
+			}
+			if (fval > 0 && (val & fval) == fval) {
+				if (print && arg->flags.delim)
+					trace_seq_puts(s, arg->flags.delim);
+				print_str_to_seq(s, format, len_arg, flag->str);
+				print = 1;
+				val &= ~fval;
+			}
+		}
+		if (val) {
+			if (print && arg->flags.delim)
+				trace_seq_puts(s, arg->flags.delim);
+			trace_seq_printf(s, "0x%llx", val);
+		}
+		break;
+	case TEP_PRINT_SYMBOL:
+		val = eval_num_arg(data, size, event, arg->symbol.field);
+		for (flag = arg->symbol.symbols; flag; flag = flag->next) {
+			fval = eval_flag(flag->value);
+			if (val == fval) {
+				print_str_to_seq(s, format, len_arg, flag->str);
+				break;
+			}
+		}
+		if (!flag)
+			trace_seq_printf(s, "0x%llx", val);
+		break;
+	case TEP_PRINT_HEX:
+	case TEP_PRINT_HEX_STR:
+		if (arg->hex.field->type == TEP_PRINT_DYNAMIC_ARRAY) {
+			dynamic_offset_field(tep, arg->hex.field->dynarray.field, data,
+				             size, &offset, NULL);
+			hex = data + offset;
+		} else {
+			field = arg->hex.field->field.field;
+			if (!field) {
+				str = arg->hex.field->field.name;
+				field = tep_find_any_field(event, str);
+				if (!field)
+					goto out_warning_field;
+				arg->hex.field->field.field = field;
+			}
+			hex = data + field->offset;
+		}
+		len = eval_num_arg(data, size, event, arg->hex.size);
+		for (i = 0; i < len; i++) {
+			if (i && arg->type == TEP_PRINT_HEX)
+				trace_seq_putc(s, ' ');
+			trace_seq_printf(s, "%02x", hex[i]);
+		}
+		break;
+
+	case TEP_PRINT_INT_ARRAY: {
+		void *num;
+		int el_size;
+
+		if (arg->int_array.field->type == TEP_PRINT_DYNAMIC_ARRAY) {
+			dynamic_offset_field(tep, arg->int_array.field->dynarray.field, data,
+					     size, &offset, NULL);
+			num = data + offset;
+		} else {
+			field = arg->int_array.field->field.field;
+			if (!field) {
+				str = arg->int_array.field->field.name;
+				field = tep_find_any_field(event, str);
+				if (!field)
+					goto out_warning_field;
+				arg->int_array.field->field.field = field;
+			}
+			num = data + field->offset;
+		}
+		len = eval_num_arg(data, size, event, arg->int_array.count);
+		el_size = eval_num_arg(data, size, event,
+				       arg->int_array.el_size);
+		for (i = 0; i < len; i++) {
+			if (i)
+				trace_seq_putc(s, ' ');
+
+			if (el_size == 1) {
+				trace_seq_printf(s, "%u", *(uint8_t *)num);
+			} else if (el_size == 2) {
+				trace_seq_printf(s, "%u", *(uint16_t *)num);
+			} else if (el_size == 4) {
+				trace_seq_printf(s, "%u", *(uint32_t *)num);
+			} else if (el_size == 8) {
+				trace_seq_printf(s, "%"PRIu64, *(uint64_t *)num);
+			} else {
+				trace_seq_printf(s, "BAD SIZE:%d 0x%x",
+						 el_size, *(uint8_t *)num);
+				el_size = 1;
+			}
+
+			num += el_size;
+		}
+		break;
+	}
+	case TEP_PRINT_TYPE:
+		break;
+	case TEP_PRINT_STRING: {
+		if (!arg->string.field) {
+			arg->string.field = tep_find_any_field(event, arg->string.string);
+			if (!arg->string.field)
+				break;
+			arg->string.offset = arg->string.field->offset;
+		}
+		dynamic_offset_field(tep, arg->string.field, data, size, &offset, &len);
+		/* Do not attempt to save zero length dynamic strings */
+		if (!len)
+			break;
+		print_str_to_seq(s, format, len_arg, ((char *)data) + offset);
+		break;
+	}
+	case TEP_PRINT_BSTRING:
+		print_str_to_seq(s, format, len_arg, arg->string.string);
+		break;
+	case TEP_PRINT_BITMASK: {
+		if (!arg->bitmask.field) {
+			arg->bitmask.field = tep_find_any_field(event, arg->bitmask.bitmask);
+			if (!arg->bitmask.field)
+				break;
+			arg->bitmask.offset = arg->bitmask.field->offset;
+		}
+		dynamic_offset_field(tep, arg->bitmask.field, data, size, &offset, &len);
+		print_bitmask_to_seq(tep, s, format, len_arg,
+				     data + offset, len);
+		break;
+	}
+	case TEP_PRINT_CPUMASK: {
+		if (!arg->bitmask.field) {
+			arg->bitmask.field = tep_find_any_field(event, arg->bitmask.bitmask);
+			arg->bitmask.offset = arg->bitmask.field->offset;
+		}
+		if (!arg->bitmask.field)
+			break;
+		dynamic_offset_field(tep, arg->bitmask.field, data, size, &offset, &len);
+		print_cpumask_to_seq(tep, s, format, len_arg,
+				     data + offset, len);
+		break;
+	}
+	case TEP_PRINT_OP:
+		/*
+		 * The only op for string should be ? :
+		 */
+		if (arg->op.op[0] != '?')
+			return;
+		val = eval_num_arg(data, size, event, arg->op.left);
+		if (val)
+			print_str_arg(s, data, size, event,
+				      format, len_arg, arg->op.right->op.left);
+		else
+			print_str_arg(s, data, size, event,
+				      format, len_arg, arg->op.right->op.right);
+		break;
+	case TEP_PRINT_FUNC:
+		process_defined_func(s, data, size, event, arg);
+		break;
+	default:
+		/* well... */
+		break;
+	}
+
+	return;
+
+out_warning_field:
+	do_warning_event(event, "%s: field %s not found",
+			 __func__, arg->field.name);
+}
+
+static unsigned long long
+process_defined_func(struct trace_seq *s, void *data, int size,
+		     struct tep_event *event, struct tep_print_arg *arg)
+{
+	struct tep_function_handler *func_handle = arg->func.func;
+	struct func_params *param;
+	unsigned long long *args;
+	unsigned long long ret;
+	struct tep_print_arg *farg;
+	struct trace_seq str;
+	struct save_str {
+		struct save_str *next;
+		char *str;
+	} *strings = NULL, *string;
+	int i;
+
+	if (!func_handle->nr_args) {
+		ret = (*func_handle->func)(s, NULL);
+		goto out;
+	}
+
+	farg = arg->func.args;
+	param = func_handle->params;
+
+	ret = ULLONG_MAX;
+	args = malloc(sizeof(*args) * func_handle->nr_args);
+	if (!args)
+		goto out;
+
+	for (i = 0; i < func_handle->nr_args; i++) {
+		switch (param->type) {
+		case TEP_FUNC_ARG_INT:
+		case TEP_FUNC_ARG_LONG:
+		case TEP_FUNC_ARG_PTR:
+			args[i] = eval_num_arg(data, size, event, farg);
+			break;
+		case TEP_FUNC_ARG_STRING:
+			trace_seq_init(&str);
+			print_str_arg(&str, data, size, event, "%s", -1, farg);
+			trace_seq_terminate(&str);
+			string = malloc(sizeof(*string));
+			if (!string) {
+				do_warning_event(event, "%s(%d): malloc str",
+						 __func__, __LINE__);
+				goto out_free;
+			}
+			string->next = strings;
+			string->str = strdup(str.buffer);
+			if (!string->str) {
+				free(string);
+				do_warning_event(event, "%s(%d): malloc str",
+						 __func__, __LINE__);
+				goto out_free;
+			}
+			args[i] = (uintptr_t)string->str;
+			strings = string;
+			trace_seq_destroy(&str);
+			break;
+		default:
+			/*
+			 * Something went totally wrong, this is not
+			 * an input error, something in this code broke.
+			 */
+			do_warning_event(event, "Unexpected end of arguments\n");
+			goto out_free;
+		}
+		farg = farg->next;
+		param = param->next;
+	}
+
+	ret = (*func_handle->func)(s, args);
+out_free:
+	free(args);
+	while (strings) {
+		string = strings;
+		strings = string->next;
+		free(string->str);
+		free(string);
+	}
+
+ out:
+	/* TBD : handle return type here */
+	return ret;
+}
+
+static void free_args(struct tep_print_arg *args)
+{
+	struct tep_print_arg *next;
+
+	while (args) {
+		next = args->next;
+
+		free_arg(args);
+		args = next;
+	}
+}
+
+static struct tep_print_arg *make_bprint_args(char *fmt, void *data, int size, struct tep_event *event)
+{
+	struct tep_handle *tep = event->tep;
+	struct tep_format_field *field, *ip_field;
+	struct tep_print_arg *args, *arg, **next;
+	unsigned long long ip, val;
+	char *ptr;
+	void *bptr;
+	int vsize = 0;
+
+	field = tep->bprint_buf_field;
+	ip_field = tep->bprint_ip_field;
+
+	if (!field) {
+		field = tep_find_field(event, "buf");
+		if (!field) {
+			do_warning_event(event, "can't find buffer field for binary printk");
+			return NULL;
+		}
+		ip_field = tep_find_field(event, "ip");
+		if (!ip_field) {
+			do_warning_event(event, "can't find ip field for binary printk");
+			return NULL;
+		}
+		tep->bprint_buf_field = field;
+		tep->bprint_ip_field = ip_field;
+	}
+
+	ip = tep_read_number(tep, data + ip_field->offset, ip_field->size);
+
+	/*
+	 * The first arg is the IP pointer.
+	 */
+	args = alloc_arg();
+	if (!args) {
+		do_warning_event(event, "%s(%d): not enough memory!",
+				 __func__, __LINE__);
+		return NULL;
+	}
+	arg = args;
+	arg->next = NULL;
+	next = &arg->next;
+
+	arg->type = TEP_PRINT_ATOM;
+		
+	if (asprintf(&arg->atom.atom, "%lld", ip) < 0)
+		goto out_free;
+
+	/* skip the first "%ps: " */
+	for (ptr = fmt + 5, bptr = data + field->offset;
+	     bptr < data + size && *ptr; ptr++) {
+		int ls = 0;
+
+		if (*ptr == '%') {
+ process_again:
+			ptr++;
+			switch (*ptr) {
+			case '%':
+				break;
+			case 'l':
+				ls++;
+				goto process_again;
+			case 'L':
+				ls = 2;
+				goto process_again;
+			case '0' ... '9':
+				goto process_again;
+			case '.':
+				goto process_again;
+			case '#':
+				goto process_again;
+			case 'z':
+			case 'Z':
+				ls = 1;
+				goto process_again;
+			case 'p':
+				ls = 1;
+				if (isalnum(ptr[1])) {
+					ptr++;
+					/* Check for special pointers */
+					switch (*ptr) {
+					case 's':
+					case 'S':
+					case 'x':
+						break;
+					case 'f':
+					case 'F':
+						/*
+						 * Pre-5.5 kernels use %pf and
+						 * %pF for printing symbols
+						 * while kernels since 5.5 use
+						 * %pfw for fwnodes. So check
+						 * %p[fF] isn't followed by 'w'.
+						 */
+						if (ptr[1] != 'w')
+							break;
+						/* fall through */
+					default:
+						/*
+						 * Older kernels do not process
+						 * dereferenced pointers.
+						 * Only process if the pointer
+						 * value is a printable.
+						 */
+						if (isprint(*(char *)bptr))
+							goto process_string;
+					}
+				}
+				/* fall through */
+			case 'd':
+			case 'u':
+			case 'i':
+			case 'x':
+			case 'X':
+			case 'o':
+				switch (ls) {
+				case 0:
+					vsize = 4;
+					break;
+				case 1:
+					vsize = tep->long_size;
+					break;
+				case 2:
+					vsize = 8;
+					break;
+				default:
+					vsize = ls; /* ? */
+					break;
+				}
+			/* fall through */
+			case '*':
+				if (*ptr == '*')
+					vsize = 4;
+
+				/* the pointers are always 4 bytes aligned */
+				bptr = (void *)(((unsigned long)bptr + 3) &
+						~3);
+				val = tep_read_number(tep, bptr, vsize);
+				bptr += vsize;
+				arg = alloc_arg();
+				if (!arg) {
+					do_warning_event(event, "%s(%d): not enough memory!",
+						   __func__, __LINE__);
+					goto out_free;
+				}
+				arg->next = NULL;
+				arg->type = TEP_PRINT_ATOM;
+				if (asprintf(&arg->atom.atom, "%lld", val) < 0) {
+					free(arg);
+					goto out_free;
+				}
+				*next = arg;
+				next = &arg->next;
+				/*
+				 * The '*' case means that an arg is used as the length.
+				 * We need to continue to figure out for what.
+				 */
+				if (*ptr == '*')
+					goto process_again;
+
+				break;
+			case 's':
+ process_string:
+				arg = alloc_arg();
+				if (!arg) {
+					do_warning_event(event, "%s(%d): not enough memory!",
+						   __func__, __LINE__);
+					goto out_free;
+				}
+				arg->next = NULL;
+				arg->type = TEP_PRINT_BSTRING;
+				arg->string.string = strdup(bptr);
+				if (!arg->string.string) {
+					free(arg);
+					goto out_free;
+				}
+				bptr += strlen(bptr) + 1;
+				*next = arg;
+				next = &arg->next;
+			default:
+				break;
+			}
+		}
+	}
+
+	return args;
+
+out_free:
+	free_args(args);
+	return NULL;
+}
+
+static char *
+get_bprint_format(void *data, int size __maybe_unused,
+		  struct tep_event *event)
+{
+	struct tep_handle *tep = event->tep;
+	unsigned long long addr;
+	struct tep_format_field *field;
+	struct printk_map *printk;
+	char *format;
+
+	field = tep->bprint_fmt_field;
+
+	if (!field) {
+		field = tep_find_field(event, "fmt");
+		if (!field) {
+			do_warning_event(event, "can't find format field for binary printk");
+			return NULL;
+		}
+		tep->bprint_fmt_field = field;
+	}
+
+	addr = tep_read_number(tep, data + field->offset, field->size);
+
+	printk = find_printk(tep, addr);
+	if (!printk) {
+		if (asprintf(&format, "%%ps: (NO FORMAT FOUND at %llx)\n", addr) < 0)
+			return NULL;
+		return format;
+	}
+
+	if (asprintf(&format, "%s: %s", "%ps", printk->printk) < 0)
+		return NULL;
+
+	return format;
+}
+
+static int print_mac_arg(struct trace_seq *s, const char *format,
+			 void *data, int size, struct tep_event *event,
+			 struct tep_print_arg *arg)
+{
+	const char *fmt = "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x";
+	bool reverse = false;
+	unsigned char *buf;
+	int ret = 0;
+
+	if (arg->type == TEP_PRINT_FUNC) {
+		process_defined_func(s, data, size, event, arg);
+		return 0;
+	}
+
+	/* evaluate if the arg has a type cast */
+	while (arg->type == TEP_PRINT_TYPE)
+		arg = arg->typecast.item;
+
+	if (arg->type != TEP_PRINT_FIELD) {
+		trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d",
+				 arg->type);
+		return 0;
+	}
+
+	if (format[0] == 'm') {
+		fmt = "%.2x%.2x%.2x%.2x%.2x%.2x";
+	} else if (format[0] == 'M' && format[1] == 'F') {
+		fmt = "%.2x-%.2x-%.2x-%.2x-%.2x-%.2x";
+		ret++;
+	}
+	if (format[1] == 'R') {
+		reverse = true;
+		ret++;
+	}
+
+	if (!arg->field.field) {
+		arg->field.field =
+			tep_find_any_field(event, arg->field.name);
+		if (!arg->field.field) {
+			do_warning_event(event, "%s: field %s not found",
+					 __func__, arg->field.name);
+			return ret;
+		}
+	}
+	if (arg->field.field->size != 6) {
+		trace_seq_printf(s, "INVALIDMAC");
+		return ret;
+	}
+
+	buf = data + arg->field.field->offset;
+	if (reverse)
+		trace_seq_printf(s, fmt, buf[5], buf[4], buf[3], buf[2], buf[1], buf[0]);
+	else
+		trace_seq_printf(s, fmt, buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
+
+	return ret;
+}
+
+static int parse_ip4_print_args(struct tep_handle *tep,
+				const char *ptr, bool *reverse)
+{
+	int ret = 0;
+
+	*reverse = false;
+
+	/* hnbl */
+	switch (*ptr) {
+	case 'h':
+		if (tep->file_bigendian)
+			*reverse = false;
+		else
+			*reverse = true;
+		ret++;
+		break;
+	case 'l':
+		*reverse = true;
+		ret++;
+		break;
+	case 'n':
+	case 'b':
+		ret++;
+		/* fall through */
+	default:
+		*reverse = false;
+		break;
+	}
+
+	return ret;
+}
+
+static void print_ip4_addr(struct trace_seq *s, char i, bool reverse, unsigned char *buf)
+{
+	const char *fmt;
+
+	if (i == 'i')
+		fmt = "%03d.%03d.%03d.%03d";
+	else
+		fmt = "%d.%d.%d.%d";
+
+	if (reverse)
+		trace_seq_printf(s, fmt, buf[3], buf[2], buf[1], buf[0]);
+	else
+		trace_seq_printf(s, fmt, buf[0], buf[1], buf[2], buf[3]);
+
+}
+
+static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
+{
+	return ((unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
+		(unsigned long)(a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
+}
+
+static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
+{
+	return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
+}
+
+static void print_ip6c_addr(struct trace_seq *s, unsigned char *addr)
+{
+	int i, j, range;
+	unsigned char zerolength[8];
+	int longest = 1;
+	int colonpos = -1;
+	uint16_t word;
+	uint8_t hi, lo;
+	bool needcolon = false;
+	bool useIPv4;
+	struct in6_addr in6;
+
+	memcpy(&in6, addr, sizeof(struct in6_addr));
+
+	useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
+
+	memset(zerolength, 0, sizeof(zerolength));
+
+	if (useIPv4)
+		range = 6;
+	else
+		range = 8;
+
+	/* find position of longest 0 run */
+	for (i = 0; i < range; i++) {
+		for (j = i; j < range; j++) {
+			if (in6.s6_addr16[j] != 0)
+				break;
+			zerolength[i]++;
+		}
+	}
+	for (i = 0; i < range; i++) {
+		if (zerolength[i] > longest) {
+			longest = zerolength[i];
+			colonpos = i;
+		}
+	}
+	if (longest == 1)		/* don't compress a single 0 */
+		colonpos = -1;
+
+	/* emit address */
+	for (i = 0; i < range; i++) {
+		if (i == colonpos) {
+			if (needcolon || i == 0)
+				trace_seq_printf(s, ":");
+			trace_seq_printf(s, ":");
+			needcolon = false;
+			i += longest - 1;
+			continue;
+		}
+		if (needcolon) {
+			trace_seq_printf(s, ":");
+			needcolon = false;
+		}
+		/* hex u16 without leading 0s */
+		word = ntohs(in6.s6_addr16[i]);
+		hi = word >> 8;
+		lo = word & 0xff;
+		if (hi)
+			trace_seq_printf(s, "%x%02x", hi, lo);
+		else
+			trace_seq_printf(s, "%x", lo);
+
+		needcolon = true;
+	}
+
+	if (useIPv4) {
+		if (needcolon)
+			trace_seq_printf(s, ":");
+		print_ip4_addr(s, 'I', false, &in6.s6_addr[12]);
+	}
+
+	return;
+}
+
+static void print_ip6_addr(struct trace_seq *s, char i, unsigned char *buf)
+{
+	int j;
+
+	for (j = 0; j < 16; j += 2) {
+		trace_seq_printf(s, "%02x%02x", buf[j], buf[j+1]);
+		if (i == 'I' && j < 14)
+			trace_seq_printf(s, ":");
+	}
+}
+
+/*
+ * %pi4   print an IPv4 address with leading zeros
+ * %pI4   print an IPv4 address without leading zeros
+ * %pi6   print an IPv6 address without colons
+ * %pI6   print an IPv6 address with colons
+ * %pI6c  print an IPv6 address in compressed form with colons
+ * %pISpc print an IP address based on sockaddr; p adds port.
+ */
+static int print_ipv4_arg(struct trace_seq *s, const char *ptr, char i,
+			  void *data, int size, struct tep_event *event,
+			  struct tep_print_arg *arg)
+{
+	bool reverse = false;
+	unsigned char *buf;
+	int ret;
+
+	ret = parse_ip4_print_args(event->tep, ptr, &reverse);
+
+	if (arg->type == TEP_PRINT_FUNC) {
+		process_defined_func(s, data, size, event, arg);
+		return ret;
+	}
+
+	/* evaluate if the arg has a type cast */
+	while (arg->type == TEP_PRINT_TYPE)
+		arg = arg->typecast.item;
+
+	if (arg->type != TEP_PRINT_FIELD) {
+		trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d", arg->type);
+		return ret;
+	}
+
+	if (!arg->field.field) {
+		arg->field.field =
+			tep_find_any_field(event, arg->field.name);
+		if (!arg->field.field) {
+			do_warning("%s: field %s not found",
+				   __func__, arg->field.name);
+			return ret;
+		}
+	}
+
+	buf = data + arg->field.field->offset;
+
+	if (arg->field.field->size != 4) {
+		trace_seq_printf(s, "INVALIDIPv4");
+		return ret;
+	}
+
+	print_ip4_addr(s, i, reverse, buf);
+	return ret;
+
+}
+
+static int print_ipv6_arg(struct trace_seq *s, const char *ptr, char i,
+			  void *data, int size, struct tep_event *event,
+			  struct tep_print_arg *arg)
+{
+	char have_c = 0;
+	unsigned char *buf;
+	int rc = 0;
+
+	/* pI6c */
+	if (i == 'I' && *ptr == 'c') {
+		have_c = 1;
+		ptr++;
+		rc++;
+	}
+
+	if (arg->type == TEP_PRINT_FUNC) {
+		process_defined_func(s, data, size, event, arg);
+		return rc;
+	}
+
+	/* evaluate if the arg has a type cast */
+	while (arg->type == TEP_PRINT_TYPE)
+		arg = arg->typecast.item;
+
+	if (arg->type != TEP_PRINT_FIELD) {
+		trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d", arg->type);
+		return rc;
+	}
+
+	if (!arg->field.field) {
+		arg->field.field =
+			tep_find_any_field(event, arg->field.name);
+		if (!arg->field.field) {
+			do_warning("%s: field %s not found",
+				   __func__, arg->field.name);
+			return rc;
+		}
+	}
+
+	buf = data + arg->field.field->offset;
+
+	if (arg->field.field->size != 16) {
+		trace_seq_printf(s, "INVALIDIPv6");
+		return rc;
+	}
+
+	if (have_c)
+		print_ip6c_addr(s, buf);
+	else
+		print_ip6_addr(s, i, buf);
+
+	return rc;
+}
+
+static int print_ipsa_arg(struct trace_seq *s, const char *ptr, char i,
+			  void *data, int size, struct tep_event *event,
+			  struct tep_print_arg *arg)
+{
+	char have_c = 0, have_p = 0;
+	unsigned char *buf;
+	struct sockaddr_storage *sa;
+	bool reverse = false;
+	unsigned int offset;
+	unsigned int len;
+	int rc = 0;
+	int ret;
+
+	/* pISpc */
+	if (i == 'I') {
+		if (*ptr == 'p') {
+			have_p = 1;
+			ptr++;
+			rc++;
+		}
+		if (*ptr == 'c') {
+			have_c = 1;
+			ptr++;
+			rc++;
+		}
+	}
+	ret = parse_ip4_print_args(event->tep, ptr, &reverse);
+	ptr += ret;
+	rc += ret;
+
+	if (arg->type == TEP_PRINT_FUNC) {
+		process_defined_func(s, data, size, event, arg);
+		return rc;
+	}
+
+	/* evaluate if the arg has a type cast */
+	while (arg->type == TEP_PRINT_TYPE)
+		arg = arg->typecast.item;
+
+	if (arg->type == TEP_PRINT_FIELD) {
+
+		if (!arg->field.field) {
+			arg->field.field =
+				tep_find_any_field(event, arg->field.name);
+			if (!arg->field.field) {
+				do_warning("%s: field %s not found",
+					   __func__, arg->field.name);
+				return rc;
+			}
+		}
+
+		offset = arg->field.field->offset;
+		len = arg->field.field->size;
+
+	} else if (arg->type == TEP_PRINT_DYNAMIC_ARRAY) {
+
+		dynamic_offset_field(event->tep, arg->dynarray.field, data,
+				     size, &offset, &len);
+
+	} else {
+		trace_seq_printf(s, "ARG NOT FIELD NOR DYNAMIC ARRAY BUT TYPE %d",
+				 arg->type);
+		return rc;
+	}
+
+	sa = (struct sockaddr_storage *)(data + offset);
+
+	if (sa->ss_family == AF_INET) {
+		struct sockaddr_in *sa4 = (struct sockaddr_in *) sa;
+
+		if (len < sizeof(struct sockaddr_in)) {
+			trace_seq_printf(s, "INVALIDIPv4");
+			return rc;
+		}
+
+		print_ip4_addr(s, i, reverse, (unsigned char *) &sa4->sin_addr);
+		if (have_p)
+			trace_seq_printf(s, ":%d", ntohs(sa4->sin_port));
+
+
+	} else if (sa->ss_family == AF_INET6) {
+		struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) sa;
+
+		if (len < sizeof(struct sockaddr_in6)) {
+			trace_seq_printf(s, "INVALIDIPv6");
+			return rc;
+		}
+
+		if (have_p)
+			trace_seq_printf(s, "[");
+
+		buf = (unsigned char *) &sa6->sin6_addr;
+		if (have_c)
+			print_ip6c_addr(s, buf);
+		else
+			print_ip6_addr(s, i, buf);
+
+		if (have_p)
+			trace_seq_printf(s, "]:%d", ntohs(sa6->sin6_port));
+	}
+
+	return rc;
+}
+
+static int print_ip_arg(struct trace_seq *s, const char *ptr,
+			void *data, int size, struct tep_event *event,
+			struct tep_print_arg *arg)
+{
+	char i = *ptr;  /* 'i' or 'I' */
+	int rc = 1;
+
+	/* IP version */
+	ptr++;
+
+	switch (*ptr) {
+	case '4':
+		rc += print_ipv4_arg(s, ptr + 1, i, data, size, event, arg);
+		break;
+	case '6':
+		rc += print_ipv6_arg(s, ptr + 1, i, data, size, event, arg);
+		break;
+	case 'S':
+		rc += print_ipsa_arg(s, ptr + 1, i, data, size, event, arg);
+		break;
+	default:
+		return 0;
+	}
+
+	return rc;
+}
+
+static const int guid_index[16] = {3, 2, 1, 0, 5, 4, 7, 6, 8, 9, 10, 11, 12, 13, 14, 15};
+static const int uuid_index[16] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
+
+static int print_uuid_arg(struct trace_seq *s, const char *ptr,
+			void *data, int size, struct tep_event *event,
+			struct tep_print_arg *arg)
+{
+	const int *index = uuid_index;
+	char *format = "%02x";
+	int ret = 0;
+	char *buf;
+	int i;
+
+	switch (*(ptr + 1)) {
+	case 'L':
+		format = "%02X";
+		/* fall through */
+	case 'l':
+		index = guid_index;
+		ret++;
+		break;
+	case 'B':
+		format = "%02X";
+		/* fall through */
+	case 'b':
+		ret++;
+		break;
+	}
+
+	if (arg->type == TEP_PRINT_FUNC) {
+		process_defined_func(s, data, size, event, arg);
+		return ret;
+	}
+
+	/* evaluate if the arg has a type cast */
+	while (arg->type == TEP_PRINT_TYPE)
+		arg = arg->typecast.item;
+
+	if (arg->type != TEP_PRINT_FIELD) {
+		trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d", arg->type);
+		return ret;
+	}
+
+	if (!arg->field.field) {
+		arg->field.field =
+			tep_find_any_field(event, arg->field.name);
+		if (!arg->field.field) {
+			do_warning("%s: field %s not found",
+				   __func__, arg->field.name);
+			return ret;
+		}
+	}
+
+	if (arg->field.field->size != 16) {
+		trace_seq_printf(s, "INVALIDUUID");
+		return ret;
+	}
+
+	buf = data + arg->field.field->offset;
+
+	for (i = 0; i < 16; i++) {
+		trace_seq_printf(s, format, buf[index[i]] & 0xff);
+		switch (i) {
+		case 3:
+		case 5:
+		case 7:
+		case 9:
+			trace_seq_printf(s, "-");
+			break;
+		}
+	}
+
+	return ret;
+}
+
+static int print_raw_buff_arg(struct trace_seq *s, const char *ptr,
+			      void *data, int size, struct tep_event *event,
+			      struct tep_print_arg *arg, int print_len)
+{
+	unsigned int offset, arr_len;
+	int plen = print_len;
+	char *delim = " ";
+	int ret = 0;
+	char *buf;
+	int i;
+
+	switch (*(ptr + 1)) {
+	case 'C':
+		delim = ":";
+		ret++;
+		break;
+	case 'D':
+		delim = "-";
+		ret++;
+		break;
+	case 'N':
+		delim = "";
+		ret++;
+		break;
+	}
+
+	if (arg->type == TEP_PRINT_FUNC) {
+		process_defined_func(s, data, size, event, arg);
+		return ret;
+	}
+
+	if (arg->type != TEP_PRINT_DYNAMIC_ARRAY) {
+		trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d", arg->type);
+		return ret;
+	}
+
+	dynamic_offset_field(event->tep, arg->dynarray.field, data, size,
+			     &offset, &arr_len);
+	buf = data + offset;
+
+	if (arr_len < plen)
+		plen = arr_len;
+
+	if (plen < 1)
+		return ret;
+
+	trace_seq_printf(s, "%02x", buf[0] & 0xff);
+	for (i = 1; i < plen; i++)
+		trace_seq_printf(s, "%s%02x", delim, buf[i] & 0xff);
+
+	return ret;
+}
+
+static int is_printable_array(char *p, unsigned int len)
+{
+	unsigned int i;
+
+	for (i = 0; i < len && p[i]; i++)
+		if (!isprint(p[i]) && !isspace(p[i]))
+		    return 0;
+	return 1;
+}
+
+static void print_field_raw(struct trace_seq *s, void *data, int size,
+			     struct tep_format_field *field)
+{
+	struct tep_handle *tep = field->event->tep;
+	unsigned int offset, len, i;
+	unsigned long long val;
+
+	if (field->flags & TEP_FIELD_IS_ARRAY) {
+		if (field->flags & TEP_FIELD_IS_DYNAMIC) {
+			dynamic_offset_field(tep, field, data, size, &offset, &len);
+		} else {
+			offset = field->offset;
+			len = field->size;
+		}
+		if (field->flags & TEP_FIELD_IS_STRING &&
+		    is_printable_array(data + offset, len)) {
+			trace_seq_printf(s, "%s", (char *)data + offset);
+		} else {
+			trace_seq_puts(s, "ARRAY[");
+			for (i = 0; i < len; i++) {
+				if (i)
+					trace_seq_puts(s, ", ");
+				trace_seq_printf(s, "%02x",
+						 *((unsigned char *)data + offset + i));
+			}
+			trace_seq_putc(s, ']');
+			field->flags &= ~TEP_FIELD_IS_STRING;
+		}
+	} else {
+		val = tep_read_number(tep, data + field->offset,
+				      field->size);
+		if (field->flags & TEP_FIELD_IS_POINTER) {
+			trace_seq_printf(s, "0x%llx", val);
+		} else if (field->flags & TEP_FIELD_IS_SIGNED) {
+			switch (field->size) {
+			case 4:
+				/*
+				 * If field is long then print it in hex.
+				 * A long usually stores pointers.
+				 */
+				if (field->flags & TEP_FIELD_IS_LONG)
+					trace_seq_printf(s, "0x%x", (int)val);
+				else
+					trace_seq_printf(s, "%d", (int)val);
+				break;
+			case 2:
+				trace_seq_printf(s, "%2d", (short)val);
+				break;
+			case 1:
+				trace_seq_printf(s, "%1d", (char)val);
+				break;
+			default:
+				trace_seq_printf(s, "%lld", val);
+			}
+		} else {
+			if (field->flags & TEP_FIELD_IS_LONG)
+				trace_seq_printf(s, "0x%llx", val);
+			else
+				trace_seq_printf(s, "%llu", val);
+		}
+	}
+	trace_seq_terminate(s);
+}
+
+static int print_parse_data(struct tep_print_parse *parse, struct trace_seq *s,
+			    void *data, int size, struct tep_event *event);
+
+static inline void print_field(struct trace_seq *s, void *data, int size,
+				    struct tep_format_field *field,
+				    struct tep_print_parse **parse_ptr)
+{
+	struct tep_event *event = field->event;
+	struct tep_print_parse *start_parse;
+	struct tep_print_parse *parse;
+	struct tep_print_arg *arg;
+	bool has_0x = false;
+
+	parse = parse_ptr ? *parse_ptr : event->print_fmt.print_cache;
+
+	if (!parse || event->flags & TEP_EVENT_FL_FAILED)
+		goto out;
+
+	if (field->flags & (TEP_FIELD_IS_ARRAY | TEP_FIELD_IS_STRING))
+		goto out;
+
+	start_parse = parse;
+	do {
+		if (parse->type == PRINT_FMT_STRING) {
+			int len = strlen(parse->format);
+
+			if (len > 1 &&
+			    strcmp(parse->format + (len -2), "0x") == 0)
+				has_0x = true;
+			else
+				has_0x = false;
+
+			goto next;
+		}
+
+		arg = parse->arg;
+
+		while (arg && arg->type == TEP_PRINT_TYPE)
+			arg = arg->typecast.item;
+
+		if (!arg || arg->type != TEP_PRINT_FIELD ||
+		    arg->field.field != field) {
+			has_0x = false;
+			goto next;
+		}
+
+		if (has_0x)
+			trace_seq_puts(s, "0x");
+
+		print_parse_data(parse, s, data, size, event);
+
+		if (parse_ptr)
+			*parse_ptr = parse->next;
+
+		return;
+
+ next:
+		parse = parse->next ? parse->next :
+				      event->print_fmt.print_cache;
+	} while (parse != start_parse);
+
+ out:
+	/* Not found. */
+	print_field_raw(s, data, size, field);
+}
+
+/**
+ * tep_print_field_content - write out the raw content of a field
+ * @s:    The trace_seq to write the content into
+ * @data: The payload to extract the field from.
+ * @size: The size of the payload.
+ * @field: The field to extract
+ *
+ * Use @field to find the field content from within @data and write it
+ * in human readable format into @s.
+ *
+ * It will not write anything on error (s->len will not move)
+ */
+void tep_print_field_content(struct trace_seq *s, void *data, int size,
+			     struct tep_format_field *field)
+{
+	print_field(s, data, size, field, NULL);
+}
+
+/** DEPRECATED **/
+void tep_print_field(struct trace_seq *s, void *data,
+		     struct tep_format_field *field)
+{
+	/* unsafe to use, should pass in size */
+	print_field(s, data, 4096, field, NULL);
+}
+
+static inline void
+print_selected_fields(struct trace_seq *s, void *data, int size,
+		      struct tep_event *event,
+		      unsigned long long ignore_mask)
+{
+	struct tep_print_parse *parse = event->print_fmt.print_cache;
+	struct tep_format_field *field;
+	unsigned long long field_mask = 1;
+
+	field = event->format.fields;
+	for(; field; field = field->next, field_mask <<= 1) {
+		if (field_mask & ignore_mask)
+			continue;
+
+		trace_seq_printf(s, " %s=", field->name);
+		print_field(s, data, size, field, &parse);
+	}
+}
+
+void tep_print_fields(struct trace_seq *s, void *data,
+		      int size, struct tep_event *event)
+{
+	print_selected_fields(s, data, size, event, 0);
+}
+
+/**
+ * tep_record_print_fields - print the field name followed by the
+ * record's field value.
+ * @s: The seq to print to
+ * @record: The record to get the event from
+ * @event: The event that the field is for
+ */
+void tep_record_print_fields(struct trace_seq *s,
+			     struct tep_record *record,
+			     struct tep_event *event)
+{
+	print_selected_fields(s, record->data, record->size, event, 0);
+}
+
+/**
+ * tep_record_print_selected_fields - print the field name followed by the
+ * record's field value for a selected subset of record fields.
+ * @s: The seq to print to
+ * @record: The record to get the event from
+ * @event: The event that the field is for
+ * @select_mask: Bit mask defining the fields to print
+ */
+void tep_record_print_selected_fields(struct trace_seq *s,
+				      struct tep_record *record,
+				      struct tep_event *event,
+				      unsigned long long select_mask)
+{
+	unsigned long long ignore_mask = ~select_mask;
+
+	print_selected_fields(s, record->data, record->size, event, ignore_mask);
+}
+
+static int print_function(struct trace_seq *s, const char *format,
+			  void *data, int size, struct tep_event *event,
+			  struct tep_print_arg *arg)
+{
+	struct func_map *func;
+	unsigned long long val;
+
+	val = eval_num_arg(data, size, event, arg);
+	func = find_func(event->tep, val);
+	if (func) {
+		trace_seq_puts(s, func->func);
+		if (*format == 'F' || *format == 'S')
+			trace_seq_printf(s, "+0x%llx", val - func->addr);
+	} else {
+		if (event->tep->long_size == 4)
+			trace_seq_printf(s, "0x%lx", (long)val);
+		else
+			trace_seq_printf(s, "0x%llx", (long long)val);
+	}
+
+	return 0;
+}
+
+static int print_arg_pointer(struct trace_seq *s, const char *format, int plen,
+			     void *data, int size,
+			     struct tep_event *event, struct tep_print_arg *arg)
+{
+	unsigned long long val;
+	int ret = 1;
+
+	if (arg->type == TEP_PRINT_BSTRING) {
+		trace_seq_puts(s, arg->string.string);
+		return 0;
+	}
+	while (*format) {
+		if (*format == 'p') {
+			format++;
+			break;
+		}
+		format++;
+	}
+
+	switch (*format) {
+	case 'F':
+	case 'f':
+	case 'S':
+	case 's':
+		ret += print_function(s, format, data, size, event, arg);
+		break;
+	case 'M':
+	case 'm':
+		ret += print_mac_arg(s, format, data, size, event, arg);
+		break;
+	case 'I':
+	case 'i':
+		ret += print_ip_arg(s, format, data, size, event, arg);
+		break;
+	case 'U':
+		ret += print_uuid_arg(s, format, data, size, event, arg);
+		break;
+	case 'h':
+		ret += print_raw_buff_arg(s, format, data, size, event, arg, plen);
+		break;
+	default:
+		ret = 0;
+		val = eval_num_arg(data, size, event, arg);
+		trace_seq_printf(s, "%p", (void *)(intptr_t)val);
+		break;
+	}
+
+	return ret;
+
+}
+
+static int print_arg_number(struct trace_seq *s, const char *format, int plen,
+			    void *data, int size, int ls,
+			    struct tep_event *event, struct tep_print_arg *arg)
+{
+	unsigned long long val;
+
+	val = eval_num_arg(data, size, event, arg);
+
+	switch (ls) {
+	case -2:
+		if (plen >= 0)
+			trace_seq_printf(s, format, plen, (char)val);
+		else
+			trace_seq_printf(s, format, (char)val);
+		break;
+	case -1:
+		if (plen >= 0)
+			trace_seq_printf(s, format, plen, (short)val);
+		else
+			trace_seq_printf(s, format, (short)val);
+		break;
+	case 0:
+		if (plen >= 0)
+			trace_seq_printf(s, format, plen, (int)val);
+		else
+			trace_seq_printf(s, format, (int)val);
+		break;
+	case 1:
+		if (plen >= 0)
+			trace_seq_printf(s, format, plen, (long)val);
+		else
+			trace_seq_printf(s, format, (long)val);
+		break;
+	case 2:
+		if (plen >= 0)
+			trace_seq_printf(s, format, plen, (long long)val);
+		else
+			trace_seq_printf(s, format, (long long)val);
+		break;
+	default:
+		do_warning_event(event, "bad count (%d)", ls);
+		event->flags |= TEP_EVENT_FL_FAILED;
+	}
+	return 0;
+}
+
+
+static void print_arg_string(struct trace_seq *s, const char *format, int plen,
+			     void *data, int size,
+			     struct tep_event *event, struct tep_print_arg *arg)
+{
+	struct trace_seq p;
+
+	/* Use helper trace_seq */
+	trace_seq_init(&p);
+	print_str_arg(&p, data, size, event,
+		      format, plen, arg);
+	trace_seq_terminate(&p);
+	trace_seq_puts(s, p.buffer);
+	trace_seq_destroy(&p);
+}
+
+static int parse_arg_format_pointer(const char *format)
+{
+	int ret = 0;
+	int index;
+	int loop;
+
+	switch (*format) {
+	case 'F':
+	case 'S':
+	case 'f':
+	case 's':
+		ret++;
+		break;
+	case 'M':
+	case 'm':
+		/* [mM]R , [mM]F */
+		switch (format[1]) {
+		case 'R':
+		case 'F':
+			ret++;
+			break;
+		}
+		ret++;
+		break;
+	case 'I':
+	case 'i':
+		index = 2;
+		loop = 1;
+		switch (format[1]) {
+		case 'S':
+			/*[S][pfs]*/
+			while (loop) {
+				switch (format[index]) {
+				case 'p':
+				case 'f':
+				case 's':
+					ret++;
+					index++;
+					break;
+				default:
+					loop = 0;
+					break;
+				}
+			}
+			/* fall through */
+		case '4':
+			/* [4S][hnbl] */
+			switch (format[index]) {
+			case 'h':
+			case 'n':
+			case 'l':
+			case 'b':
+				ret++;
+				index++;
+				break;
+			}
+			if (format[1] == '4') {
+				ret++;
+				break;
+			}
+			/* fall through */
+		case '6':
+			/* [6S]c */
+			if (format[index] == 'c')
+				ret++;
+			ret++;
+			break;
+		}
+		ret++;
+		break;
+	case 'U':
+		switch (format[1]) {
+		case 'L':
+		case 'l':
+		case 'B':
+		case 'b':
+			ret++;
+			break;
+		}
+		ret++;
+		break;
+	case 'h':
+		switch (format[1]) {
+		case 'C':
+		case 'D':
+		case 'N':
+			ret++;
+			break;
+		}
+		ret++;
+		break;
+	default:
+		break;
+	}
+
+	return ret;
+}
+
+static void free_parse_args(struct tep_print_parse *arg)
+{
+	struct tep_print_parse *del;
+
+	while (arg) {
+		del = arg;
+		arg = del->next;
+		free(del->format);
+		free(del);
+	}
+}
+
+static int parse_arg_add(struct tep_print_parse **parse, char *format,
+			 enum tep_print_parse_type type,
+			 struct tep_print_arg *arg,
+			 struct tep_print_arg *len_as_arg,
+			 int ls)
+{
+	struct tep_print_parse *parg = NULL;
+
+	parg = calloc(1, sizeof(*parg));
+	if (!parg)
+		goto error;
+	parg->format = strdup(format);
+	if (!parg->format)
+		goto error;
+	parg->type = type;
+	parg->arg = arg;
+	parg->len_as_arg = len_as_arg;
+	parg->ls = ls;
+	*parse = parg;
+	return 0;
+error:
+	if (parg) {
+		free(parg->format);
+		free(parg);
+	}
+	return -1;
+}
+
+static int parse_arg_format(struct tep_print_parse **parse,
+			    struct tep_event *event,
+			    const char *format, struct tep_print_arg **arg)
+{
+	struct tep_print_arg *len_arg = NULL;
+	char print_format[32];
+	const char *start = format;
+	int ret = 0;
+	int ls = 0;
+	int res;
+	int len;
+
+	format++;
+	ret++;
+	for (; *format; format++) {
+		switch (*format) {
+		case '#':
+			/* FIXME: need to handle properly */
+			break;
+		case 'h':
+			ls--;
+			break;
+		case 'l':
+			ls++;
+			break;
+		case 'L':
+			ls = 2;
+			break;
+		case 'z':
+		case 'Z':
+			ls = 1;
+			break;
+		case '.':
+		case '0' ... '9':
+		case '-':
+			break;
+		case '*':
+			/* The argument is the length. */
+			if (!*arg) {
+				do_warning_event(event, "no argument match");
+				event->flags |= TEP_EVENT_FL_FAILED;
+				goto out_failed;
+			}
+			if (len_arg) {
+				do_warning_event(event, "argument already matched");
+				event->flags |= TEP_EVENT_FL_FAILED;
+				goto out_failed;
+			}
+			len_arg = *arg;
+			*arg = (*arg)->next;
+			break;
+		case 'p':
+			if (!*arg) {
+				do_warning_event(event, "no argument match");
+				event->flags |= TEP_EVENT_FL_FAILED;
+				goto out_failed;
+			}
+			res = parse_arg_format_pointer(format + 1);
+			if (res > 0) {
+				format += res;
+				ret += res;
+			}
+			len = ((unsigned long)format + 1) -
+				(unsigned long)start;
+			/* should never happen */
+			if (len > 31) {
+				do_warning_event(event, "bad format!");
+				event->flags |= TEP_EVENT_FL_FAILED;
+				len = 31;
+			}
+			memcpy(print_format, start, len);
+			print_format[len] = 0;
+
+			parse_arg_add(parse, print_format,
+				      PRINT_FMT_ARG_POINTER, *arg, len_arg, ls);
+			*arg = (*arg)->next;
+			ret++;
+			return ret;
+		case 'd':
+		case 'u':
+		case 'i':
+		case 'x':
+		case 'X':
+		case 'o':
+			if (!*arg) {
+				do_warning_event(event, "no argument match");
+				event->flags |= TEP_EVENT_FL_FAILED;
+				goto out_failed;
+			}
+
+			len = ((unsigned long)format + 1) -
+				(unsigned long)start;
+
+			/* should never happen */
+			if (len > 30) {
+				do_warning_event(event, "bad format!");
+				event->flags |= TEP_EVENT_FL_FAILED;
+				len = 31;
+			}
+			memcpy(print_format, start, len);
+			print_format[len] = 0;
+
+			if (event->tep->long_size == 8 && ls == 1 &&
+			    sizeof(long) != 8) {
+				char *p;
+
+				/* make %l into %ll */
+				if (ls == 1 && (p = strchr(print_format, 'l')))
+					memmove(p+1, p, strlen(p)+1);
+				ls = 2;
+			}
+			if (ls < -2 || ls > 2) {
+				do_warning_event(event, "bad count (%d)", ls);
+				event->flags |= TEP_EVENT_FL_FAILED;
+			}
+			parse_arg_add(parse, print_format,
+				      PRINT_FMT_ARG_DIGIT, *arg, len_arg, ls);
+			*arg = (*arg)->next;
+			ret++;
+			return ret;
+		case 's':
+			if (!*arg) {
+				do_warning_event(event, "no matching argument");
+				event->flags |= TEP_EVENT_FL_FAILED;
+				goto out_failed;
+			}
+
+			len = ((unsigned long)format + 1) -
+				(unsigned long)start;
+
+			/* should never happen */
+			if (len > 31) {
+				do_warning_event(event, "bad format!");
+				event->flags |= TEP_EVENT_FL_FAILED;
+				len = 31;
+			}
+
+			memcpy(print_format, start, len);
+			print_format[len] = 0;
+
+			parse_arg_add(parse, print_format,
+					PRINT_FMT_ARG_STRING, *arg, len_arg, 0);
+			*arg = (*arg)->next;
+			ret++;
+			return ret;
+		default:
+			snprintf(print_format, 32, ">%c<", *format);
+			parse_arg_add(parse, print_format,
+					PRINT_FMT_STRING, NULL, NULL, 0);
+			ret++;
+			return ret;
+		}
+		ret++;
+	}
+
+out_failed:
+	return ret;
+
+}
+
+static int parse_arg_string(struct tep_print_parse **parse, const char *format)
+{
+	struct trace_seq s;
+	int ret = 0;
+
+	trace_seq_init(&s);
+	for (; *format; format++) {
+		if (*format == '\\') {
+			format++;
+			ret++;
+			switch (*format) {
+			case 'n':
+				trace_seq_putc(&s, '\n');
+				break;
+			case 't':
+				trace_seq_putc(&s, '\t');
+				break;
+			case 'r':
+				trace_seq_putc(&s, '\r');
+				break;
+			case '\\':
+				trace_seq_putc(&s, '\\');
+				break;
+			default:
+				trace_seq_putc(&s, *format);
+				break;
+			}
+		} else if (*format == '%') {
+			if (*(format + 1) == '%') {
+				trace_seq_putc(&s, '%');
+				format++;
+				ret++;
+			} else
+				break;
+		} else
+			trace_seq_putc(&s, *format);
+
+		ret++;
+	}
+	trace_seq_terminate(&s);
+	parse_arg_add(parse, s.buffer, PRINT_FMT_STRING, NULL, NULL, 0);
+	trace_seq_destroy(&s);
+
+	return ret;
+}
+
+static struct tep_print_parse *
+parse_args(struct tep_event *event, const char *format, struct tep_print_arg *arg)
+{
+	struct tep_print_parse *parse_ret = NULL;
+	struct tep_print_parse **parse = NULL;
+	int ret;
+	int len;
+
+	len = strlen(format);
+	while (*format) {
+		if (!parse_ret)
+			parse = &parse_ret;
+		if (*format == '%' && *(format + 1) != '%')
+			ret = parse_arg_format(parse, event, format, &arg);
+		else
+			ret = parse_arg_string(parse, format);
+		if (*parse)
+			parse = &((*parse)->next);
+
+		len -= ret;
+		if (len > 0)
+			format += ret;
+		else
+			break;
+	}
+	return parse_ret;
+}
+
+static int print_parse_data(struct tep_print_parse *parse, struct trace_seq *s,
+			    void *data, int size, struct tep_event *event)
+{
+	int len_arg;
+
+	if (parse->len_as_arg)
+		len_arg = eval_num_arg(data, size, event, parse->len_as_arg);
+
+	switch (parse->type) {
+	case PRINT_FMT_ARG_DIGIT:
+		print_arg_number(s, parse->format,
+				 parse->len_as_arg ? len_arg : -1, data,
+				 size, parse->ls, event, parse->arg);
+		break;
+	case PRINT_FMT_ARG_POINTER:
+		print_arg_pointer(s, parse->format,
+				  parse->len_as_arg ? len_arg : 1,
+				  data, size, event, parse->arg);
+		break;
+	case PRINT_FMT_ARG_STRING:
+		print_arg_string(s, parse->format,
+				 parse->len_as_arg ? len_arg : -1,
+				 data, size, event, parse->arg);
+		break;
+	case PRINT_FMT_STRING:
+	default:
+		trace_seq_printf(s, "%s", parse->format);
+		/* Return 1 on non field. */
+		return 1;
+	}
+	/* Return 0 on field being processed. */
+	return 0;
+}
+
+static void print_event_cache(struct tep_print_parse *parse, struct trace_seq *s,
+			      void *data, int size, struct tep_event *event)
+{
+	while (parse) {
+		print_parse_data(parse, s, data, size, event);
+		parse = parse->next;
+	}
+}
+
+static void pretty_print(struct trace_seq *s, void *data, int size, struct tep_event *event)
+{
+	struct tep_print_parse *parse = event->print_fmt.print_cache;
+	struct tep_print_arg *args = NULL;
+	char *bprint_fmt = NULL;
+
+	if (event->flags & TEP_EVENT_FL_FAILED) {
+		trace_seq_printf(s, "[FAILED TO PARSE]");
+		tep_print_fields(s, data, size, event);
+		return;
+	}
+
+	if (event->flags & TEP_EVENT_FL_ISBPRINT) {
+		bprint_fmt = get_bprint_format(data, size, event);
+		args = make_bprint_args(bprint_fmt, data, size, event);
+		parse = parse_args(event, bprint_fmt, args);
+	}
+
+	print_event_cache(parse, s, data, size, event);
+
+	if (event->flags & TEP_EVENT_FL_ISBPRINT) {
+		free_parse_args(parse);
+		free_args(args);
+		free(bprint_fmt);
+	}
+}
+
+/*
+ * This parses out the Latency format (interrupts disabled,
+ * need rescheduling, in hard/soft interrupt, preempt count
+ * and lock depth) and places it into the trace_seq.
+ */
+static void data_latency_format(struct tep_handle *tep, struct trace_seq *s,
+				char *format, struct tep_record *record)
+{
+	static int check_lock_depth = 1;
+	static int check_migrate_disable = 1;
+	static int lock_depth_exists;
+	static int migrate_disable_exists;
+	unsigned int lat_flags;
+	struct trace_seq sq;
+	unsigned int pc;
+	int lock_depth = 0;
+	int migrate_disable = 0;
+	int hardirq;
+	int softirq;
+	void *data = record->data;
+
+	trace_seq_init(&sq);
+	lat_flags = parse_common_flags(tep, data);
+	pc = parse_common_pc(tep, data);
+	/* lock_depth may not always exist */
+	if (lock_depth_exists)
+		lock_depth = parse_common_lock_depth(tep, data);
+	else if (check_lock_depth) {
+		lock_depth = parse_common_lock_depth(tep, data);
+		if (lock_depth < 0)
+			check_lock_depth = 0;
+		else
+			lock_depth_exists = 1;
+	}
+
+	/* migrate_disable may not always exist */
+	if (migrate_disable_exists)
+		migrate_disable = parse_common_migrate_disable(tep, data);
+	else if (check_migrate_disable) {
+		migrate_disable = parse_common_migrate_disable(tep, data);
+		if (migrate_disable < 0)
+			check_migrate_disable = 0;
+		else
+			migrate_disable_exists = 1;
+	}
+
+	hardirq = lat_flags & TRACE_FLAG_HARDIRQ;
+	softirq = lat_flags & TRACE_FLAG_SOFTIRQ;
+
+	trace_seq_printf(&sq, "%c%c%c",
+	       (lat_flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
+	       (lat_flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
+	       'X' : '.',
+	       (lat_flags & TRACE_FLAG_NEED_RESCHED) ?
+	       'N' : '.',
+	       (hardirq && softirq) ? 'H' :
+	       hardirq ? 'h' : softirq ? 's' : '.');
+
+	if (pc & 0xf)
+		trace_seq_printf(&sq, "%x", pc & 0xf);
+	else
+		trace_seq_printf(&sq, ".");
+
+	if (pc & 0xf0)
+		trace_seq_printf(&sq, "%x", pc >> 4);
+	else
+		trace_seq_printf(&sq, ".");
+
+	if (migrate_disable_exists) {
+		if (migrate_disable < 0)
+			trace_seq_printf(&sq, ".");
+		else
+			trace_seq_printf(&sq, "%d", migrate_disable);
+	}
+
+	if (lock_depth_exists) {
+		if (lock_depth < 0)
+			trace_seq_printf(&sq, ".");
+		else
+			trace_seq_printf(&sq, "%d", lock_depth);
+	}
+
+	if (sq.state == TRACE_SEQ__MEM_ALLOC_FAILED) {
+		s->state = TRACE_SEQ__MEM_ALLOC_FAILED;
+		return;
+	}
+
+	trace_seq_terminate(&sq);
+	trace_seq_puts(s, sq.buffer);
+	trace_seq_destroy(&sq);
+	trace_seq_terminate(s);
+}
+
+/**
+ * tep_data_type - parse out the given event type
+ * @tep: a handle to the trace event parser context
+ * @rec: the record to read from
+ *
+ * This returns the event id from the @rec.
+ */
+int tep_data_type(struct tep_handle *tep, struct tep_record *rec)
+{
+	return trace_parse_common_type(tep, rec->data);
+}
+
+/**
+ * tep_data_pid - parse the PID from record
+ * @tep: a handle to the trace event parser context
+ * @rec: the record to parse
+ *
+ * This returns the PID from a record.
+ */
+int tep_data_pid(struct tep_handle *tep, struct tep_record *rec)
+{
+	return parse_common_pid(tep, rec->data);
+}
+
+/**
+ * tep_data_preempt_count - parse the preempt count from the record
+ * @tep: a handle to the trace event parser context
+ * @rec: the record to parse
+ *
+ * This returns the preempt count from a record.
+ */
+int tep_data_preempt_count(struct tep_handle *tep, struct tep_record *rec)
+{
+	return parse_common_pc(tep, rec->data);
+}
+
+/**
+ * tep_data_flags - parse the latency flags from the record
+ * @tep: a handle to the trace event parser context
+ * @rec: the record to parse
+ *
+ * This returns the latency flags from a record.
+ *
+ *  Use trace_flag_type enum for the flags (see event-parse.h).
+ */
+int tep_data_flags(struct tep_handle *tep, struct tep_record *rec)
+{
+	return parse_common_flags(tep, rec->data);
+}
+
+/**
+ * tep_data_comm_from_pid - return the command line from PID
+ * @tep: a handle to the trace event parser context
+ * @pid: the PID of the task to search for
+ *
+ * This returns a pointer to the command line that has the given
+ * @pid.
+ */
+const char *tep_data_comm_from_pid(struct tep_handle *tep, int pid)
+{
+	const char *comm;
+
+	comm = find_cmdline(tep, pid);
+	return comm;
+}
+
+static struct tep_cmdline *
+pid_from_cmdlist(struct tep_handle *tep, const char *comm, struct tep_cmdline *next)
+{
+	struct cmdline_list *cmdlist = (struct cmdline_list *)next;
+
+	if (cmdlist)
+		cmdlist = cmdlist->next;
+	else
+		cmdlist = tep->cmdlist;
+
+	while (cmdlist && strcmp(cmdlist->comm, comm) != 0)
+		cmdlist = cmdlist->next;
+
+	return (struct tep_cmdline *)cmdlist;
+}
+
+/**
+ * tep_data_pid_from_comm - return the pid from a given comm
+ * @tep: a handle to the trace event parser context
+ * @comm: the cmdline to find the pid from
+ * @next: the cmdline structure to find the next comm
+ *
+ * This returns the cmdline structure that holds a pid for a given
+ * comm, or NULL if none found. As there may be more than one pid for
+ * a given comm, the result of this call can be passed back into
+ * a recurring call in the @next parameter, and then it will find the
+ * next pid.
+ * Also, it does a linear search, so it may be slow.
+ */
+struct tep_cmdline *tep_data_pid_from_comm(struct tep_handle *tep, const char *comm,
+					   struct tep_cmdline *next)
+{
+	struct tep_cmdline *cmdline;
+
+	/*
+	 * If the cmdlines have not been converted yet, then use
+	 * the list.
+	 */
+	if (!tep->cmdlines)
+		return pid_from_cmdlist(tep, comm, next);
+
+	if (next) {
+		/*
+		 * The next pointer could have been still from
+		 * a previous call before cmdlines were created
+		 */
+		if (next < tep->cmdlines ||
+		    next >= tep->cmdlines + tep->cmdline_count)
+			next = NULL;
+		else
+			cmdline  = next++;
+	}
+
+	if (!next)
+		cmdline = tep->cmdlines;
+
+	while (cmdline < tep->cmdlines + tep->cmdline_count) {
+		if (strcmp(cmdline->comm, comm) == 0)
+			return cmdline;
+		cmdline++;
+	}
+	return NULL;
+}
+
+/**
+ * tep_cmdline_pid - return the pid associated to a given cmdline
+ * @tep: a handle to the trace event parser context
+ * @cmdline: The cmdline structure to get the pid from
+ *
+ * Returns the pid for a give cmdline. If @cmdline is NULL, then
+ * -1 is returned.
+ */
+int tep_cmdline_pid(struct tep_handle *tep, struct tep_cmdline *cmdline)
+{
+	struct cmdline_list *cmdlist = (struct cmdline_list *)cmdline;
+
+	if (!cmdline)
+		return -1;
+
+	/*
+	 * If cmdlines have not been created yet, or cmdline is
+	 * not part of the array, then treat it as a cmdlist instead.
+	 */
+	if (!tep->cmdlines ||
+	    cmdline < tep->cmdlines ||
+	    cmdline >= tep->cmdlines + tep->cmdline_count)
+		return cmdlist->pid;
+
+	return cmdline->pid;
+}
+
+/*
+ * This parses the raw @data using the given @event information and
+ * writes the print format into the trace_seq.
+ */
+static void print_event_info(struct trace_seq *s, char *format, bool raw,
+			     struct tep_event *event, struct tep_record *record)
+{
+	int print_pretty = 1;
+
+	if (raw || (event->flags & TEP_EVENT_FL_PRINTRAW))
+		tep_print_fields(s, record->data, record->size, event);
+	else {
+
+		if (event->handler && !(event->flags & TEP_EVENT_FL_NOHANDLE))
+			print_pretty = event->handler(s, record, event,
+						      event->context);
+
+		if (print_pretty)
+			pretty_print(s, record->data, record->size, event);
+	}
+
+	trace_seq_terminate(s);
+}
+
+/**
+ * tep_find_event_by_record - return the event from a given record
+ * @tep: a handle to the trace event parser context
+ * @record: The record to get the event from
+ *
+ * Returns the associated event for a given record, or NULL if non is
+ * is found.
+ */
+struct tep_event *
+tep_find_event_by_record(struct tep_handle *tep, struct tep_record *record)
+{
+	int type;
+
+	if (record->size < 0) {
+		do_warning("ug! negative record size %d", record->size);
+		return NULL;
+	}
+
+	type = trace_parse_common_type(tep, record->data);
+
+	return tep_find_event(tep, type);
+}
+
+/*
+ * Writes the timestamp of the record into @s. Time divisor and precision can be
+ * specified as part of printf @format string. Example:
+ *	"%3.1000d" - divide the time by 1000 and print the first 3 digits
+ *	before the dot. Thus, the timestamp "123456000" will be printed as
+ *	"123.456"
+ */
+static void print_event_time(struct tep_handle *tep, struct trace_seq *s,
+				 char *format, struct tep_event *event,
+				 struct tep_record *record)
+{
+	unsigned long long time;
+	char *divstr;
+	int prec = 0, pr;
+	int div = 0;
+	int p10 = 1;
+
+	if (isdigit(*(format + 1)))
+		prec = atoi(format + 1);
+	divstr = strchr(format, '.');
+	if (divstr && isdigit(*(divstr + 1)))
+		div = atoi(divstr + 1);
+	time = record->ts;
+	if (div) {
+		time += div / 2;
+		time /= div;
+	}
+	pr = prec;
+	while (pr--)
+		p10 *= 10;
+
+	if (p10 > 1)
+		trace_seq_printf(s, "%5llu.%0*llu", time / p10, prec, time % p10);
+	else
+		trace_seq_printf(s, "%12llu", time);
+}
+
+struct print_event_type {
+	enum {
+		EVENT_TYPE_INT = 1,
+		EVENT_TYPE_STRING,
+		EVENT_TYPE_UNKNOWN,
+	} type;
+	char format[32];
+};
+
+static void print_string(struct tep_handle *tep, struct trace_seq *s,
+			 struct tep_record *record, struct tep_event *event,
+			 const char *arg, struct print_event_type *type)
+{
+	const char *comm;
+	int pid;
+
+	if (strncmp(arg, TEP_PRINT_LATENCY, strlen(TEP_PRINT_LATENCY)) == 0) {
+		data_latency_format(tep, s, type->format, record);
+	} else if (strncmp(arg, TEP_PRINT_COMM, strlen(TEP_PRINT_COMM)) == 0) {
+		pid = parse_common_pid(tep, record->data);
+		comm = find_cmdline(tep, pid);
+		trace_seq_printf(s, type->format, comm);
+	} else if (strncmp(arg, TEP_PRINT_INFO_RAW, strlen(TEP_PRINT_INFO_RAW)) == 0) {
+		print_event_info(s, type->format, true, event, record);
+	} else if (strncmp(arg, TEP_PRINT_INFO, strlen(TEP_PRINT_INFO)) == 0) {
+		print_event_info(s, type->format, false, event, record);
+	} else if  (strncmp(arg, TEP_PRINT_NAME, strlen(TEP_PRINT_NAME)) == 0) {
+		trace_seq_printf(s, type->format, event->name);
+	} else {
+		trace_seq_printf(s, "[UNKNOWN TEP TYPE %s]", arg);
+	}
+
+}
+
+static void print_int(struct tep_handle *tep, struct trace_seq *s,
+		      struct tep_record *record, struct tep_event *event,
+		      int arg, struct print_event_type *type)
+{
+	int param;
+
+	switch (arg) {
+	case TEP_PRINT_CPU:
+		param = record->cpu;
+		break;
+	case TEP_PRINT_PID:
+		param = parse_common_pid(tep, record->data);
+		break;
+	case TEP_PRINT_TIME:
+		return print_event_time(tep, s, type->format, event, record);
+	default:
+		return;
+	}
+	trace_seq_printf(s, type->format, param);
+}
+
+static int tep_print_event_param_type(char *format,
+				      struct print_event_type *type)
+{
+	char *str = format + 1;
+	int i = 1;
+
+	type->type = EVENT_TYPE_UNKNOWN;
+	while (*str) {
+		switch (*str) {
+		case 'd':
+		case 'u':
+		case 'i':
+		case 'x':
+		case 'X':
+		case 'o':
+			type->type = EVENT_TYPE_INT;
+			break;
+		case 's':
+			type->type = EVENT_TYPE_STRING;
+			break;
+		}
+		str++;
+		i++;
+		if (type->type != EVENT_TYPE_UNKNOWN)
+			break;
+	}
+	memset(type->format, 0, 32);
+	memcpy(type->format, format, i < 32 ? i : 31);
+	return i;
+}
+
+/**
+ * tep_print_event - Write various event information
+ * @tep: a handle to the trace event parser context
+ * @s: the trace_seq to write to
+ * @record: The record to get the event from
+ * @format: a printf format string. Supported event fileds:
+ *	TEP_PRINT_PID, "%d" - event PID
+ *	TEP_PRINT_CPU, "%d" - event CPU
+ *	TEP_PRINT_COMM, "%s" - event command string
+ *	TEP_PRINT_NAME, "%s" - event name
+ *	TEP_PRINT_LATENCY, "%s" - event latency
+ *	TEP_PRINT_TIME, %d - event time stamp. A divisor and precision
+ *			can be specified as part of this format string:
+ *			"%precision.divisord". Example:
+ *			"%3.1000d" - divide the time by 1000 and print the first
+ *			3 digits before the dot. Thus, the time stamp
+ *			"123456000" will be printed as "123.456"
+ *	TEP_PRINT_INFO, "%s" - event information. If any width is specified in
+ *			the format string, the event information will be printed
+ *			in raw format.
+ * Writes the specified event information into @s.
+ */
+void tep_print_event(struct tep_handle *tep, struct trace_seq *s,
+		     struct tep_record *record, const char *fmt, ...)
+{
+	struct print_event_type type;
+	struct tep_event *event;
+	char *current;
+	char *format;
+	char *str;
+	int offset;
+	va_list args;
+
+	event = tep_find_event_by_record(tep, record);
+	if (!event) {
+		trace_seq_printf(s, "[UNKNOWN EVENT]");
+		return;
+	}
+
+	str = current = format = strdup(fmt);
+	if (!format)
+		return;
+
+	va_start(args, fmt);
+	while (*current) {
+		current = strchr(str, '%');
+		if (!current) {
+			trace_seq_puts(s, str);
+			break;
+		}
+		memset(&type, 0, sizeof(type));
+		offset = tep_print_event_param_type(current, &type);
+		*current = '\0';
+		trace_seq_puts(s, str);
+		current += offset;
+		switch (type.type) {
+		case EVENT_TYPE_STRING:
+			print_string(tep, s, record, event,
+				     va_arg(args, char*), &type);
+			break;
+		case EVENT_TYPE_INT:
+			print_int(tep, s, record, event,
+				  va_arg(args, int), &type);
+			break;
+		case EVENT_TYPE_UNKNOWN:
+		default:
+			trace_seq_printf(s, "[UNKNOWN TYPE]");
+			break;
+		}
+		str = current;
+
+	}
+	va_end(args);
+	free(format);
+}
+
+static int events_id_cmp(const void *a, const void *b)
+{
+	struct tep_event * const * ea = a;
+	struct tep_event * const * eb = b;
+
+	if ((*ea)->id < (*eb)->id)
+		return -1;
+
+	if ((*ea)->id > (*eb)->id)
+		return 1;
+
+	return 0;
+}
+
+static int events_name_cmp(const void *a, const void *b)
+{
+	struct tep_event * const * ea = a;
+	struct tep_event * const * eb = b;
+	int res;
+
+	res = strcmp((*ea)->name, (*eb)->name);
+	if (res)
+		return res;
+
+	res = strcmp((*ea)->system, (*eb)->system);
+	if (res)
+		return res;
+
+	return events_id_cmp(a, b);
+}
+
+static int events_system_cmp(const void *a, const void *b)
+{
+	struct tep_event * const * ea = a;
+	struct tep_event * const * eb = b;
+	int res;
+
+	res = strcmp((*ea)->system, (*eb)->system);
+	if (res)
+		return res;
+
+	res = strcmp((*ea)->name, (*eb)->name);
+	if (res)
+		return res;
+
+	return events_id_cmp(a, b);
+}
+
+static struct tep_event **list_events_copy(struct tep_handle *tep)
+{
+	struct tep_event **events;
+
+	if (!tep)
+		return NULL;
+
+	events = malloc(sizeof(*events) * (tep->nr_events + 1));
+	if (!events)
+		return NULL;
+
+	memcpy(events, tep->events, sizeof(*events) * tep->nr_events);
+	events[tep->nr_events] = NULL;
+	return events;
+}
+
+static void list_events_sort(struct tep_event **events, int nr_events,
+			     enum tep_event_sort_type sort_type)
+{
+	int (*sort)(const void *a, const void *b);
+
+	switch (sort_type) {
+	case TEP_EVENT_SORT_ID:
+		sort = events_id_cmp;
+		break;
+	case TEP_EVENT_SORT_NAME:
+		sort = events_name_cmp;
+		break;
+	case TEP_EVENT_SORT_SYSTEM:
+		sort = events_system_cmp;
+		break;
+	default:
+		sort = NULL;
+	}
+
+	if (sort)
+		qsort(events, nr_events, sizeof(*events), sort);
+}
+
+/**
+ * tep_list_events - Get events, sorted by given criteria.
+ * @tep: a handle to the tep context
+ * @sort_type: desired sort order of the events in the array
+ *
+ * Returns an array of pointers to all events, sorted by the given
+ * @sort_type criteria. The last element of the array is NULL. The returned
+ * memory must not be freed, it is managed by the library.
+ * The function is not thread safe.
+ */
+struct tep_event **tep_list_events(struct tep_handle *tep,
+				   enum tep_event_sort_type sort_type)
+{
+	struct tep_event **events;
+
+	if (!tep)
+		return NULL;
+
+	events = tep->sort_events;
+	if (events && tep->last_type == sort_type)
+		return events;
+
+	if (!events) {
+		events = list_events_copy(tep);
+		if (!events)
+			return NULL;
+
+		tep->sort_events = events;
+
+		/* the internal events are sorted by id */
+		if (sort_type == TEP_EVENT_SORT_ID) {
+			tep->last_type = sort_type;
+			return events;
+		}
+	}
+
+	list_events_sort(events, tep->nr_events, sort_type);
+	tep->last_type = sort_type;
+
+	return events;
+}
+
+
+/**
+ * tep_list_events_copy - Thread safe version of tep_list_events()
+ * @tep: a handle to the tep context
+ * @sort_type: desired sort order of the events in the array
+ *
+ * Returns an array of pointers to all events, sorted by the given
+ * @sort_type criteria. The last element of the array is NULL. The returned
+ * array is newly allocated inside the function and must be freed by the caller
+ */
+struct tep_event **tep_list_events_copy(struct tep_handle *tep,
+					enum tep_event_sort_type sort_type)
+{
+	struct tep_event **events;
+
+	if (!tep)
+		return NULL;
+
+	events = list_events_copy(tep);
+	if (!events)
+		return NULL;
+
+	/* the internal events are sorted by id */
+	if (sort_type == TEP_EVENT_SORT_ID)
+		return events;
+
+	list_events_sort(events, tep->nr_events, sort_type);
+
+	return events;
+}
+
+static struct tep_format_field **
+get_event_fields(const char *type, const char *name,
+		 int count, struct tep_format_field *list)
+{
+	struct tep_format_field **fields;
+	struct tep_format_field *field;
+	int i = 0;
+
+	fields = malloc(sizeof(*fields) * (count + 1));
+	if (!fields)
+		return NULL;
+
+	for (field = list; field; field = field->next) {
+		fields[i++] = field;
+		if (i == count + 1) {
+			do_warning("event %s has more %s fields than specified",
+				name, type);
+			i--;
+			break;
+		}
+	}
+
+	if (i != count)
+		do_warning("event %s has less %s fields than specified",
+			name, type);
+
+	fields[i] = NULL;
+
+	return fields;
+}
+
+/**
+ * tep_event_common_fields - return a list of common fields for an event
+ * @event: the event to return the common fields of.
+ *
+ * Returns an allocated array of fields. The last item in the array is NULL.
+ * The array must be freed with free().
+ */
+struct tep_format_field **tep_event_common_fields(struct tep_event *event)
+{
+	return get_event_fields("common", event->name,
+				event->format.nr_common,
+				event->format.common_fields);
+}
+
+/**
+ * tep_event_fields - return a list of event specific fields for an event
+ * @event: the event to return the fields of.
+ *
+ * Returns an allocated array of fields. The last item in the array is NULL.
+ * The array must be freed with free().
+ */
+struct tep_format_field **tep_event_fields(struct tep_event *event)
+{
+	return get_event_fields("event", event->name,
+				event->format.nr_fields,
+				event->format.fields);
+}
+
+static void print_fields(struct trace_seq *s, struct tep_print_flag_sym *field)
+{
+	trace_seq_printf(s, "{ %s, %s }", field->value, field->str);
+	if (field->next) {
+		trace_seq_puts(s, ", ");
+		print_fields(s, field->next);
+	}
+}
+
+/* for debugging */
+static void print_args(struct tep_print_arg *args)
+{
+	int print_paren = 1;
+	struct trace_seq s;
+
+	switch (args->type) {
+	case TEP_PRINT_NULL:
+		printf("null");
+		break;
+	case TEP_PRINT_ATOM:
+		printf("%s", args->atom.atom);
+		break;
+	case TEP_PRINT_FIELD:
+		printf("REC->%s", args->field.name);
+		break;
+	case TEP_PRINT_FLAGS:
+		printf("__print_flags(");
+		print_args(args->flags.field);
+		printf(", %s, ", args->flags.delim);
+		trace_seq_init(&s);
+		print_fields(&s, args->flags.flags);
+		trace_seq_do_printf(&s);
+		trace_seq_destroy(&s);
+		printf(")");
+		break;
+	case TEP_PRINT_SYMBOL:
+		printf("__print_symbolic(");
+		print_args(args->symbol.field);
+		printf(", ");
+		trace_seq_init(&s);
+		print_fields(&s, args->symbol.symbols);
+		trace_seq_do_printf(&s);
+		trace_seq_destroy(&s);
+		printf(")");
+		break;
+	case TEP_PRINT_HEX:
+		printf("__print_hex(");
+		print_args(args->hex.field);
+		printf(", ");
+		print_args(args->hex.size);
+		printf(")");
+		break;
+	case TEP_PRINT_HEX_STR:
+		printf("__print_hex_str(");
+		print_args(args->hex.field);
+		printf(", ");
+		print_args(args->hex.size);
+		printf(")");
+		break;
+	case TEP_PRINT_INT_ARRAY:
+		printf("__print_array(");
+		print_args(args->int_array.field);
+		printf(", ");
+		print_args(args->int_array.count);
+		printf(", ");
+		print_args(args->int_array.el_size);
+		printf(")");
+		break;
+	case TEP_PRINT_STRING:
+	case TEP_PRINT_BSTRING:
+		printf("__get_str(%s)", args->string.string);
+		break;
+	case TEP_PRINT_BITMASK:
+		printf("__get_bitmask(%s)", args->bitmask.bitmask);
+		break;
+	case TEP_PRINT_CPUMASK:
+		printf("__get_cpumask(%s)", args->bitmask.bitmask);
+		break;
+	case TEP_PRINT_TYPE:
+		printf("(%s)", args->typecast.type);
+		print_args(args->typecast.item);
+		break;
+	case TEP_PRINT_OP:
+		if (strcmp(args->op.op, ":") == 0)
+			print_paren = 0;
+		if (print_paren)
+			printf("(");
+		print_args(args->op.left);
+		printf(" %s ", args->op.op);
+		print_args(args->op.right);
+		if (print_paren)
+			printf(")");
+		break;
+	default:
+		/* we should warn... */
+		return;
+	}
+	if (args->next) {
+		printf("\n");
+		print_args(args->next);
+	}
+}
+
+static void parse_header_field(struct tep_handle *tep, const char *field,
+			       int *offset, int *size, int mandatory)
+{
+	unsigned long long save_input_buf_ptr;
+	unsigned long long save_input_buf_siz;
+	char *token;
+	int type;
+
+	save_input_buf_ptr = tep->input_buf_ptr;
+	save_input_buf_siz = tep->input_buf_siz;
+
+	if (read_expected(tep, TEP_EVENT_ITEM, "field") < 0)
+		return;
+	if (read_expected(tep, TEP_EVENT_OP, ":") < 0)
+		return;
+
+	/* type */
+	if (read_expect_type(tep, TEP_EVENT_ITEM, &token) < 0)
+		goto fail;
+	free_token(token);
+
+	/*
+	 * If this is not a mandatory field, then test it first.
+	 */
+	if (mandatory) {
+		if (read_expected(tep, TEP_EVENT_ITEM, field) < 0)
+			return;
+	} else {
+		if (read_expect_type(tep, TEP_EVENT_ITEM, &token) < 0)
+			goto fail;
+		if (strcmp(token, field) != 0)
+			goto discard;
+		free_token(token);
+	}
+
+	if (read_expected(tep, TEP_EVENT_OP, ";") < 0)
+		return;
+	if (read_expected(tep, TEP_EVENT_ITEM, "offset") < 0)
+		return;
+	if (read_expected(tep, TEP_EVENT_OP, ":") < 0)
+		return;
+	if (read_expect_type(tep, TEP_EVENT_ITEM, &token) < 0)
+		goto fail;
+	*offset = atoi(token);
+	free_token(token);
+	if (read_expected(tep, TEP_EVENT_OP, ";") < 0)
+		return;
+	if (read_expected(tep, TEP_EVENT_ITEM, "size") < 0)
+		return;
+	if (read_expected(tep, TEP_EVENT_OP, ":") < 0)
+		return;
+	if (read_expect_type(tep, TEP_EVENT_ITEM, &token) < 0)
+		goto fail;
+	*size = atoi(token);
+	free_token(token);
+	if (read_expected(tep, TEP_EVENT_OP, ";") < 0)
+		return;
+	type = read_token(tep, &token);
+	if (type != TEP_EVENT_NEWLINE) {
+		/* newer versions of the kernel have a "signed" type */
+		if (type != TEP_EVENT_ITEM)
+			goto fail;
+
+		if (strcmp(token, "signed") != 0)
+			goto fail;
+
+		free_token(token);
+
+		if (read_expected(tep, TEP_EVENT_OP, ":") < 0)
+			return;
+
+		if (read_expect_type(tep, TEP_EVENT_ITEM, &token))
+			goto fail;
+
+		free_token(token);
+		if (read_expected(tep, TEP_EVENT_OP, ";") < 0)
+			return;
+
+		if (read_expect_type(tep, TEP_EVENT_NEWLINE, &token))
+			goto fail;
+	}
+ fail:
+	free_token(token);
+	return;
+
+ discard:
+	tep->input_buf_ptr = save_input_buf_ptr;
+	tep->input_buf_siz = save_input_buf_siz;
+	*offset = 0;
+	*size = 0;
+	free_token(token);
+}
+
+/**
+ * tep_parse_header_page - parse the data stored in the header page
+ * @tep: a handle to the trace event parser context
+ * @buf: the buffer storing the header page format string
+ * @size: the size of @buf
+ * @long_size: the long size to use if there is no header
+ *
+ * This parses the header page format for information on the
+ * ring buffer used. The @buf should be copied from
+ *
+ * /sys/kernel/debug/tracing/events/header_page
+ */
+int tep_parse_header_page(struct tep_handle *tep, char *buf, unsigned long size,
+			  int long_size)
+{
+	int ignore;
+
+	if (!size) {
+		/*
+		 * Old kernels did not have header page info.
+		 * Sorry but we just use what we find here in user space.
+		 */
+		tep->header_page_ts_size = sizeof(long long);
+		tep->header_page_size_size = long_size;
+		tep->header_page_data_offset = sizeof(long long) + long_size;
+		tep->header_page_data_size = getpagesize() - tep->header_page_data_offset;
+		tep->old_format = 1;
+		return -1;
+	}
+	init_input_buf(tep, buf, size);
+
+	parse_header_field(tep, "timestamp", &tep->header_page_ts_offset,
+			   &tep->header_page_ts_size, 1);
+	parse_header_field(tep, "commit", &tep->header_page_size_offset,
+			   &tep->header_page_size_size, 1);
+	parse_header_field(tep, "overwrite", &tep->header_page_overwrite,
+			   &ignore, 0);
+	parse_header_field(tep, "data", &tep->header_page_data_offset,
+			   &tep->header_page_data_size, 1);
+
+	return 0;
+}
+
+static int event_matches(struct tep_event *event,
+			 int id, const char *sys_name,
+			 const char *event_name)
+{
+	if (id >= 0 && id != event->id)
+		return 0;
+
+	if (event_name && (strcmp(event_name, event->name) != 0))
+		return 0;
+
+	if (sys_name && (strcmp(sys_name, event->system) != 0))
+		return 0;
+
+	return 1;
+}
+
+static void free_handler(struct event_handler *handle)
+{
+	free((void *)handle->sys_name);
+	free((void *)handle->event_name);
+	free(handle);
+}
+
+static int find_event_handle(struct tep_handle *tep, struct tep_event *event)
+{
+	struct event_handler *handle, **next;
+
+	for (next = &tep->handlers; *next;
+	     next = &(*next)->next) {
+		handle = *next;
+		if (event_matches(event, handle->id,
+				  handle->sys_name,
+				  handle->event_name))
+			break;
+	}
+
+	if (!(*next))
+		return 0;
+
+	tep_info("overriding event (%d) %s:%s with new print handler",
+		 event->id, event->system, event->name);
+
+	event->handler = handle->func;
+	event->context = handle->context;
+
+	*next = handle->next;
+	free_handler(handle);
+
+	return 1;
+}
+
+/**
+ * parse_format - parse the event format
+ * @buf: the buffer storing the event format string
+ * @size: the size of @buf
+ * @sys: the system the event belongs to
+ *
+ * This parses the event format and creates an event structure
+ * to quickly parse raw data for a given event.
+ *
+ * These files currently come from:
+ *
+ * /sys/kernel/debug/tracing/events/.../.../format
+ */
+static enum tep_errno parse_format(struct tep_event **eventp,
+				   struct tep_handle *tep, const char *buf,
+				   unsigned long size, const char *sys)
+{
+	struct tep_event *event;
+	int ret;
+
+	init_input_buf(tep, buf, size);
+
+	*eventp = event = alloc_event();
+	if (!event)
+		return TEP_ERRNO__MEM_ALLOC_FAILED;
+
+	event->name = event_read_name(tep);
+	if (!event->name) {
+		/* Bad event? */
+		ret = TEP_ERRNO__MEM_ALLOC_FAILED;
+		goto event_alloc_failed;
+	}
+
+	if (strcmp(sys, "ftrace") == 0) {
+		event->flags |= TEP_EVENT_FL_ISFTRACE;
+
+		if (strcmp(event->name, "bprint") == 0)
+			event->flags |= TEP_EVENT_FL_ISBPRINT;
+	}
+		
+	event->id = event_read_id(tep);
+	if (event->id < 0) {
+		ret = TEP_ERRNO__READ_ID_FAILED;
+		/*
+		 * This isn't an allocation error actually.
+		 * But as the ID is critical, just bail out.
+		 */
+		goto event_alloc_failed;
+	}
+
+	event->system = strdup(sys);
+	if (!event->system) {
+		ret = TEP_ERRNO__MEM_ALLOC_FAILED;
+		goto event_alloc_failed;
+	}
+
+	/* Add tep to event so that it can be referenced */
+	event->tep = tep;
+
+	ret = event_read_format(event);
+	if (ret < 0) {
+		ret = TEP_ERRNO__READ_FORMAT_FAILED;
+		goto event_parse_failed;
+	}
+
+	/*
+	 * If the event has an override, don't print warnings if the event
+	 * print format fails to parse.
+	 */
+	if (tep && find_event_handle(tep, event))
+		show_warning = 0;
+
+	ret = event_read_print(event);
+	show_warning = 1;
+
+	if (ret < 0) {
+		ret = TEP_ERRNO__READ_PRINT_FAILED;
+		goto event_parse_failed;
+	}
+
+	if (!ret && (event->flags & TEP_EVENT_FL_ISFTRACE)) {
+		struct tep_format_field *field;
+		struct tep_print_arg *arg, **list;
+
+		/* old ftrace had no args */
+		list = &event->print_fmt.args;
+		for (field = event->format.fields; field; field = field->next) {
+			arg = alloc_arg();
+			if (!arg) {
+				event->flags |= TEP_EVENT_FL_FAILED;
+				return TEP_ERRNO__OLD_FTRACE_ARG_FAILED;
+			}
+			arg->type = TEP_PRINT_FIELD;
+			arg->field.name = strdup(field->name);
+			if (!arg->field.name) {
+				event->flags |= TEP_EVENT_FL_FAILED;
+				free_arg(arg);
+				return TEP_ERRNO__OLD_FTRACE_ARG_FAILED;
+			}
+			arg->field.field = field;
+			*list = arg;
+			list = &arg->next;
+		}
+	}
+
+	if (!(event->flags & TEP_EVENT_FL_ISBPRINT))
+		event->print_fmt.print_cache = parse_args(event,
+							  event->print_fmt.format,
+							  event->print_fmt.args);
+
+	return 0;
+
+ event_parse_failed:
+	event->flags |= TEP_EVENT_FL_FAILED;
+	return ret;
+
+ event_alloc_failed:
+	free(event->system);
+	free(event->name);
+	free(event);
+	*eventp = NULL;
+	return ret;
+}
+
+static enum tep_errno
+__parse_event(struct tep_handle *tep,
+	      struct tep_event **eventp,
+	      const char *buf, unsigned long size,
+	      const char *sys)
+{
+	int ret = parse_format(eventp, tep, buf, size, sys);
+	struct tep_event *event = *eventp;
+
+	if (event == NULL)
+		return ret;
+
+	if (tep && add_event(tep, event)) {
+		ret = TEP_ERRNO__MEM_ALLOC_FAILED;
+		goto event_add_failed;
+	}
+
+#define PRINT_ARGS 0
+	if (PRINT_ARGS && event->print_fmt.args)
+		print_args(event->print_fmt.args);
+
+	return 0;
+
+event_add_failed:
+	free_tep_event(event);
+	return ret;
+}
+
+/**
+ * tep_parse_format - parse the event format
+ * @tep: a handle to the trace event parser context
+ * @eventp: returned format
+ * @buf: the buffer storing the event format string
+ * @size: the size of @buf
+ * @sys: the system the event belongs to
+ *
+ * This parses the event format and creates an event structure
+ * to quickly parse raw data for a given event.
+ *
+ * These files currently come from:
+ *
+ * /sys/kernel/debug/tracing/events/.../.../format
+ */
+enum tep_errno tep_parse_format(struct tep_handle *tep,
+				struct tep_event **eventp,
+				const char *buf,
+				unsigned long size, const char *sys)
+{
+	return __parse_event(tep, eventp, buf, size, sys);
+}
+
+/**
+ * tep_parse_event - parse the event format
+ * @tep: a handle to the trace event parser context
+ * @buf: the buffer storing the event format string
+ * @size: the size of @buf
+ * @sys: the system the event belongs to
+ *
+ * This parses the event format and creates an event structure
+ * to quickly parse raw data for a given event.
+ *
+ * These files currently come from:
+ *
+ * /sys/kernel/debug/tracing/events/.../.../format
+ */
+enum tep_errno tep_parse_event(struct tep_handle *tep, const char *buf,
+			       unsigned long size, const char *sys)
+{
+	struct tep_event *event = NULL;
+	return __parse_event(tep, &event, buf, size, sys);
+}
+
+int get_field_val(struct trace_seq *s, struct tep_format_field *field,
+		  const char *name, struct tep_record *record,
+		  unsigned long long *val, int err)
+{
+	if (!field) {
+		if (err)
+			trace_seq_printf(s, "<CANT FIND FIELD %s>", name);
+		return -1;
+	}
+
+	if (tep_read_number_field(field, record->data, val)) {
+		if (err)
+			trace_seq_printf(s, " %s=INVALID", name);
+		return -1;
+	}
+
+	return 0;
+}
+
+/**
+ * tep_get_field_raw - return the raw pointer into the data field
+ * @s: The seq to print to on error
+ * @event: the event that the field is for
+ * @name: The name of the field
+ * @record: The record with the field name.
+ * @len: place to store the field length.
+ * @err: print default error if failed.
+ *
+ * Returns a pointer into record->data of the field and places
+ * the length of the field in @len.
+ *
+ * On failure, it returns NULL.
+ */
+void *tep_get_field_raw(struct trace_seq *s, struct tep_event *event,
+			const char *name, struct tep_record *record,
+			int *len, int err)
+{
+	struct tep_format_field *field;
+	void *data = record->data;
+	unsigned offset;
+	int dummy;
+
+	if (!event)
+		return NULL;
+
+	field = tep_find_field(event, name);
+
+	if (!field) {
+		if (err)
+			trace_seq_printf(s, "<CANT FIND FIELD %s>", name);
+		return NULL;
+	}
+
+	/* Allow @len to be NULL */
+	if (!len)
+		len = &dummy;
+
+	offset = field->offset;
+	if (field->flags & TEP_FIELD_IS_DYNAMIC) {
+		offset = tep_read_number(event->tep,
+					 data + offset, field->size);
+		*len = offset >> 16;
+		offset &= 0xffff;
+		if (field->flags & TEP_FIELD_IS_RELATIVE)
+			offset += field->offset + field->size;
+	} else
+		*len = field->size;
+
+	return data + offset;
+}
+
+/**
+ * tep_get_field_val - find a field and return its value
+ * @s: The seq to print to on error
+ * @event: the event that the field is for
+ * @name: The name of the field
+ * @record: The record with the field name.
+ * @val: place to store the value of the field.
+ * @err: print default error if failed.
+ *
+ * Returns 0 on success -1 on field not found.
+ */
+int tep_get_field_val(struct trace_seq *s, struct tep_event *event,
+		      const char *name, struct tep_record *record,
+		      unsigned long long *val, int err)
+{
+	struct tep_format_field *field;
+
+	if (!event)
+		return -1;
+
+	field = tep_find_field(event, name);
+
+	return get_field_val(s, field, name, record, val, err);
+}
+
+/**
+ * tep_get_common_field_val - find a common field and return its value
+ * @s: The seq to print to on error
+ * @event: the event that the field is for
+ * @name: The name of the field
+ * @record: The record with the field name.
+ * @val: place to store the value of the field.
+ * @err: print default error if failed.
+ *
+ * Returns 0 on success -1 on field not found.
+ */
+int tep_get_common_field_val(struct trace_seq *s, struct tep_event *event,
+			     const char *name, struct tep_record *record,
+			     unsigned long long *val, int err)
+{
+	struct tep_format_field *field;
+
+	if (!event)
+		return -1;
+
+	field = tep_find_common_field(event, name);
+
+	return get_field_val(s, field, name, record, val, err);
+}
+
+/**
+ * tep_get_any_field_val - find a any field and return its value
+ * @s: The seq to print to on error
+ * @event: the event that the field is for
+ * @name: The name of the field
+ * @record: The record with the field name.
+ * @val: place to store the value of the field.
+ * @err: print default error if failed.
+ *
+ * Returns 0 on success -1 on field not found.
+ */
+int tep_get_any_field_val(struct trace_seq *s, struct tep_event *event,
+			  const char *name, struct tep_record *record,
+			  unsigned long long *val, int err)
+{
+	struct tep_format_field *field;
+
+	if (!event)
+		return -1;
+
+	field = tep_find_any_field(event, name);
+
+	return get_field_val(s, field, name, record, val, err);
+}
+
+/**
+ * tep_print_num_field - print a field and a format
+ * @s: The seq to print to
+ * @fmt: The printf format to print the field with.
+ * @event: the event that the field is for
+ * @name: The name of the field
+ * @record: The record with the field name.
+ * @err: print default error if failed.
+ *
+ * Returns positive value on success, negative in case of an error,
+ * or 0 if buffer is full.
+ */
+int tep_print_num_field(struct trace_seq *s, const char *fmt,
+			struct tep_event *event, const char *name,
+			struct tep_record *record, int err)
+{
+	struct tep_format_field *field = tep_find_field(event, name);
+	unsigned long long val;
+
+	if (!field)
+		goto failed;
+
+	if (tep_read_number_field(field, record->data, &val))
+		goto failed;
+
+	return trace_seq_printf(s, fmt, val);
+
+ failed:
+	if (err)
+		trace_seq_printf(s, "CAN'T FIND FIELD \"%s\"", name);
+	return -1;
+}
+
+/**
+ * tep_print_func_field - print a field and a format for function pointers
+ * @s: The seq to print to
+ * @fmt: The printf format to print the field with.
+ * @event: the event that the field is for
+ * @name: The name of the field
+ * @record: The record with the field name.
+ * @err: print default error if failed.
+ *
+ * Returns positive value on success, negative in case of an error,
+ * or 0 if buffer is full.
+ */
+int tep_print_func_field(struct trace_seq *s, const char *fmt,
+			 struct tep_event *event, const char *name,
+			 struct tep_record *record, int err)
+{
+	struct tep_format_field *field = tep_find_field(event, name);
+	struct tep_handle *tep = event->tep;
+	unsigned long long val;
+	struct func_map *func;
+	char tmp[128];
+
+	if (!field)
+		goto failed;
+
+	if (tep_read_number_field(field, record->data, &val))
+		goto failed;
+
+	func = find_func(tep, val);
+
+	if (func)
+		snprintf(tmp, 128, "%s/0x%llx", func->func, func->addr - val);
+	else
+		sprintf(tmp, "0x%08llx", val);
+
+	return trace_seq_printf(s, fmt, tmp);
+
+ failed:
+	if (err)
+		trace_seq_printf(s, "CAN'T FIND FIELD \"%s\"", name);
+	return -1;
+}
+
+static void free_func_handle(struct tep_function_handler *func)
+{
+	struct func_params *params;
+
+	free(func->name);
+
+	while (func->params) {
+		params = func->params;
+		func->params = params->next;
+		free(params);
+	}
+
+	free(func);
+}
+
+/**
+ * tep_register_print_function - register a helper function
+ * @tep: a handle to the trace event parser context
+ * @func: the function to process the helper function
+ * @ret_type: the return type of the helper function
+ * @name: the name of the helper function
+ * @parameters: A list of enum tep_func_arg_type
+ *
+ * Some events may have helper functions in the print format arguments.
+ * This allows a plugin to dynamically create a way to process one
+ * of these functions.
+ *
+ * The @parameters is a variable list of tep_func_arg_type enums that
+ * must end with TEP_FUNC_ARG_VOID.
+ */
+int tep_register_print_function(struct tep_handle *tep,
+				tep_func_handler func,
+				enum tep_func_arg_type ret_type,
+				char *name, ...)
+{
+	struct tep_function_handler *func_handle;
+	struct func_params **next_param;
+	struct func_params *param;
+	enum tep_func_arg_type type;
+	va_list ap;
+	int ret;
+
+	func_handle = find_func_handler(tep, name);
+	if (func_handle) {
+		/*
+		 * This is most like caused by the users own
+		 * plugins updating the function. This overrides the
+		 * system defaults.
+		 */
+		tep_info("override of function helper '%s'", name);
+		remove_func_handler(tep, name);
+	}
+
+	func_handle = calloc(1, sizeof(*func_handle));
+	if (!func_handle) {
+		do_warning("Failed to allocate function handler");
+		return TEP_ERRNO__MEM_ALLOC_FAILED;
+	}
+
+	func_handle->ret_type = ret_type;
+	func_handle->name = strdup(name);
+	func_handle->func = func;
+	if (!func_handle->name) {
+		do_warning("Failed to allocate function name");
+		free(func_handle);
+		return TEP_ERRNO__MEM_ALLOC_FAILED;
+	}
+
+	next_param = &(func_handle->params);
+	va_start(ap, name);
+	for (;;) {
+		type = va_arg(ap, enum tep_func_arg_type);
+		if (type == TEP_FUNC_ARG_VOID)
+			break;
+
+		if (type >= TEP_FUNC_ARG_MAX_TYPES) {
+			do_warning("Invalid argument type %d", type);
+			ret = TEP_ERRNO__INVALID_ARG_TYPE;
+			goto out_free;
+		}
+
+		param = malloc(sizeof(*param));
+		if (!param) {
+			do_warning("Failed to allocate function param");
+			ret = TEP_ERRNO__MEM_ALLOC_FAILED;
+			goto out_free;
+		}
+		param->type = type;
+		param->next = NULL;
+
+		*next_param = param;
+		next_param = &(param->next);
+
+		func_handle->nr_args++;
+	}
+	va_end(ap);
+
+	func_handle->next = tep->func_handlers;
+	tep->func_handlers = func_handle;
+
+	return 0;
+ out_free:
+	va_end(ap);
+	free_func_handle(func_handle);
+	return ret;
+}
+
+/**
+ * tep_unregister_print_function - unregister a helper function
+ * @tep: a handle to the trace event parser context
+ * @func: the function to process the helper function
+ * @name: the name of the helper function
+ *
+ * This function removes existing print handler for function @name.
+ *
+ * Returns 0 if the handler was removed successully, -1 otherwise.
+ */
+int tep_unregister_print_function(struct tep_handle *tep,
+				  tep_func_handler func, char *name)
+{
+	struct tep_function_handler *func_handle;
+
+	func_handle = find_func_handler(tep, name);
+	if (func_handle && func_handle->func == func) {
+		remove_func_handler(tep, name);
+		return 0;
+	}
+	return -1;
+}
+
+static struct tep_event *search_event(struct tep_handle *tep, int id,
+				      const char *sys_name,
+				      const char *event_name)
+{
+	struct tep_event *event;
+
+	if (id >= 0) {
+		/* search by id */
+		event = tep_find_event(tep, id);
+		if (!event)
+			return NULL;
+		if (event_name && (strcmp(event_name, event->name) != 0))
+			return NULL;
+		if (sys_name && (strcmp(sys_name, event->system) != 0))
+			return NULL;
+	} else {
+		event = tep_find_event_by_name(tep, sys_name, event_name);
+		if (!event)
+			return NULL;
+	}
+	return event;
+}
+
+/**
+ * tep_register_event_handler - register a way to parse an event
+ * @tep: a handle to the trace event parser context
+ * @id: the id of the event to register
+ * @sys_name: the system name the event belongs to
+ * @event_name: the name of the event
+ * @func: the function to call to parse the event information
+ * @context: the data to be passed to @func
+ *
+ * This function allows a developer to override the parsing of
+ * a given event. If for some reason the default print format
+ * is not sufficient, this function will register a function
+ * for an event to be used to parse the data instead.
+ *
+ * If @id is >= 0, then it is used to find the event.
+ * else @sys_name and @event_name are used.
+ *
+ * Returns:
+ *  TEP_REGISTER_SUCCESS_OVERWRITE if an existing handler is overwritten
+ *  TEP_REGISTER_SUCCESS if a new handler is registered successfully
+ *  negative TEP_ERRNO_... in case of an error
+ *
+ */
+int tep_register_event_handler(struct tep_handle *tep, int id,
+			       const char *sys_name, const char *event_name,
+			       tep_event_handler_func func, void *context)
+{
+	struct tep_event *event;
+	struct event_handler *handle;
+
+	event = search_event(tep, id, sys_name, event_name);
+	if (event == NULL)
+		goto not_found;
+
+	tep_info("overriding event (%d) %s:%s with new print handler",
+		 event->id, event->system, event->name);
+
+	event->handler = func;
+	event->context = context;
+	return TEP_REGISTER_SUCCESS_OVERWRITE;
+
+ not_found:
+	/* Save for later use. */
+	handle = calloc(1, sizeof(*handle));
+	if (!handle) {
+		do_warning("Failed to allocate event handler");
+		return TEP_ERRNO__MEM_ALLOC_FAILED;
+	}
+
+	handle->id = id;
+	if (event_name)
+		handle->event_name = strdup(event_name);
+	if (sys_name)
+		handle->sys_name = strdup(sys_name);
+
+	if ((event_name && !handle->event_name) ||
+	    (sys_name && !handle->sys_name)) {
+		do_warning("Failed to allocate event/sys name");
+		free((void *)handle->event_name);
+		free((void *)handle->sys_name);
+		free(handle);
+		return TEP_ERRNO__MEM_ALLOC_FAILED;
+	}
+
+	handle->func = func;
+	handle->next = tep->handlers;
+	tep->handlers = handle;
+	handle->context = context;
+
+	return TEP_REGISTER_SUCCESS;
+}
+
+static int handle_matches(struct event_handler *handler, int id,
+			  const char *sys_name, const char *event_name,
+			  tep_event_handler_func func, void *context)
+{
+	if (id >= 0 && id != handler->id)
+		return 0;
+
+	if (event_name && (strcmp(event_name, handler->event_name) != 0))
+		return 0;
+
+	if (sys_name && (strcmp(sys_name, handler->sys_name) != 0))
+		return 0;
+
+	if (func != handler->func || context != handler->context)
+		return 0;
+
+	return 1;
+}
+
+/**
+ * tep_unregister_event_handler - unregister an existing event handler
+ * @tep: a handle to the trace event parser context
+ * @id: the id of the event to unregister
+ * @sys_name: the system name the handler belongs to
+ * @event_name: the name of the event handler
+ * @func: the function to call to parse the event information
+ * @context: the data to be passed to @func
+ *
+ * This function removes existing event handler (parser).
+ *
+ * If @id is >= 0, then it is used to find the event.
+ * else @sys_name and @event_name are used.
+ *
+ * Returns 0 if handler was removed successfully, -1 if event was not found.
+ */
+int tep_unregister_event_handler(struct tep_handle *tep, int id,
+				 const char *sys_name, const char *event_name,
+				 tep_event_handler_func func, void *context)
+{
+	struct tep_event *event;
+	struct event_handler *handle;
+	struct event_handler **next;
+
+	event = search_event(tep, id, sys_name, event_name);
+	if (event == NULL)
+		goto not_found;
+
+	if (event->handler == func && event->context == context) {
+		tep_info("removing override handler for event (%d) %s:%s. Going back to default handler.",
+			 event->id, event->system, event->name);
+
+		event->handler = NULL;
+		event->context = NULL;
+		return 0;
+	}
+
+not_found:
+	for (next = &tep->handlers; *next; next = &(*next)->next) {
+		handle = *next;
+		if (handle_matches(handle, id, sys_name, event_name,
+				   func, context))
+			break;
+	}
+
+	if (!(*next))
+		return -1;
+
+	*next = handle->next;
+	free_handler(handle);
+
+	return 0;
+}
+
+/**
+ * tep_alloc - create a tep handle
+ */
+struct tep_handle *tep_alloc(void)
+{
+	struct tep_handle *tep = calloc(1, sizeof(*tep));
+
+	if (tep) {
+		tep->ref_count = 1;
+		tep->host_bigendian = tep_is_bigendian();
+	}
+
+	return tep;
+}
+
+void tep_ref(struct tep_handle *tep)
+{
+	tep->ref_count++;
+}
+
+int tep_get_ref(struct tep_handle *tep)
+{
+	if (tep)
+		return tep->ref_count;
+	return 0;
+}
+
+__hidden void free_tep_format_field(struct tep_format_field *field)
+{
+	free(field->type);
+	if (field->alias != field->name)
+		free(field->alias);
+	free(field->name);
+	free(field);
+}
+
+static void free_format_fields(struct tep_format_field *field)
+{
+	struct tep_format_field *next;
+
+	while (field) {
+		next = field->next;
+		free_tep_format_field(field);
+		field = next;
+	}
+}
+
+static void free_formats(struct tep_format *format)
+{
+	free_format_fields(format->common_fields);
+	free_format_fields(format->fields);
+}
+
+__hidden void free_tep_event(struct tep_event *event)
+{
+	free(event->name);
+	free(event->system);
+
+	free_formats(&event->format);
+
+	free(event->print_fmt.format);
+	free_args(event->print_fmt.args);
+	free_parse_args(event->print_fmt.print_cache);
+	free(event);
+}
+
+/**
+ * tep_free - free a tep handle
+ * @tep: the tep handle to free
+ */
+void tep_free(struct tep_handle *tep)
+{
+	struct cmdline_list *cmdlist, *cmdnext;
+	struct func_list *funclist, *funcnext;
+	struct printk_list *printklist, *printknext;
+	struct tep_function_handler *func_handler;
+	struct event_handler *handle;
+	int i;
+
+	if (!tep)
+		return;
+
+	cmdlist = tep->cmdlist;
+	funclist = tep->funclist;
+	printklist = tep->printklist;
+
+	tep->ref_count--;
+	if (tep->ref_count)
+		return;
+
+	if (tep->cmdlines) {
+		for (i = 0; i < tep->cmdline_count; i++)
+			free(tep->cmdlines[i].comm);
+		free(tep->cmdlines);
+	}
+
+	while (cmdlist) {
+		cmdnext = cmdlist->next;
+		free(cmdlist->comm);
+		free(cmdlist);
+		cmdlist = cmdnext;
+	}
+
+	if (tep->func_map) {
+		for (i = 0; i < (int)tep->func_count; i++) {
+			free(tep->func_map[i].func);
+			free(tep->func_map[i].mod);
+		}
+		free(tep->func_map);
+	}
+
+	while (funclist) {
+		funcnext = funclist->next;
+		free(funclist->func);
+		free(funclist->mod);
+		free(funclist);
+		funclist = funcnext;
+	}
+
+	while (tep->func_handlers) {
+		func_handler = tep->func_handlers;
+		tep->func_handlers = func_handler->next;
+		free_func_handle(func_handler);
+	}
+
+	if (tep->printk_map) {
+		for (i = 0; i < (int)tep->printk_count; i++)
+			free(tep->printk_map[i].printk);
+		free(tep->printk_map);
+	}
+
+	while (printklist) {
+		printknext = printklist->next;
+		free(printklist->printk);
+		free(printklist);
+		printklist = printknext;
+	}
+
+	for (i = 0; i < tep->nr_events; i++)
+		free_tep_event(tep->events[i]);
+
+	while (tep->handlers) {
+		handle = tep->handlers;
+		tep->handlers = handle->next;
+		free_handler(handle);
+	}
+
+	free(tep->events);
+	free(tep->sort_events);
+	free(tep->func_resolver);
+	free_tep_plugin_paths(tep);
+
+	free(tep);
+}
+
+void tep_unref(struct tep_handle *tep)
+{
+	tep_free(tep);
+}
diff --git a/src/event-plugin.c b/src/event-plugin.c
new file mode 100644
index 0000000..f42243f
--- /dev/null
+++ b/src/event-plugin.c
@@ -0,0 +1,711 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ *
+ */
+
+#include <ctype.h>
+#include <stdio.h>
+#include <string.h>
+#include <dlfcn.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <errno.h>
+#include "event-parse.h"
+#include "event-parse-local.h"
+#include "event-utils.h"
+#include "trace-seq.h"
+
+#define LOCAL_PLUGIN_DIR ".local/lib/traceevent/plugins/"
+
+static struct registered_plugin_options {
+	struct registered_plugin_options	*next;
+	struct tep_plugin_option		*options;
+} *registered_options;
+
+static struct trace_plugin_options {
+	struct trace_plugin_options	*next;
+	char				*plugin;
+	char				*option;
+	char				*value;
+} *trace_plugin_options;
+
+struct tep_plugin_list {
+	struct tep_plugin_list	*next;
+	char			*name;
+	void			*handle;
+};
+
+struct tep_plugins_dir {
+	struct tep_plugins_dir		*next;
+	char				*path;
+	enum tep_plugin_load_priority	prio;
+};
+
+static void lower_case(char *str)
+{
+	if (!str)
+		return;
+	for (; *str; str++)
+		*str = tolower(*str);
+}
+
+static int update_option_value(struct tep_plugin_option *op, const char *val)
+{
+	char *op_val;
+
+	if (!val) {
+		/* toggle, only if option is boolean */
+		if (op->value)
+			/* Warn? */
+			return 0;
+		op->set ^= 1;
+		return 0;
+	}
+
+	/*
+	 * If the option has a value then it takes a string
+	 * otherwise the option is a boolean.
+	 */
+	if (op->value) {
+		op->value = val;
+		return 0;
+	}
+
+	/* Option is boolean, must be either "1", "0", "true" or "false" */
+
+	op_val = strdup(val);
+	if (!op_val)
+		return -1;
+	lower_case(op_val);
+
+	if (strcmp(val, "1") == 0 || strcmp(val, "true") == 0)
+		op->set = 1;
+	else if (strcmp(val, "0") == 0 || strcmp(val, "false") == 0)
+		op->set = 0;
+	free(op_val);
+
+	return 0;
+}
+
+/**
+ * tep_plugin_list_options - get list of plugin options
+ *
+ * Returns an array of char strings that list the currently registered
+ * plugin options in the format of <plugin>:<option>. This list can be
+ * used by toggling the option.
+ *
+ * Returns NULL if there's no options registered. On error it returns
+ * INVALID_PLUGIN_LIST_OPTION
+ *
+ * Must be freed with tep_plugin_free_options_list().
+ */
+char **tep_plugin_list_options(void)
+{
+	struct registered_plugin_options *reg;
+	struct tep_plugin_option *op;
+	char **list = NULL;
+	char *name;
+	int count = 0;
+
+	for (reg = registered_options; reg; reg = reg->next) {
+		for (op = reg->options; op->name; op++) {
+			char *alias = op->plugin_alias ? op->plugin_alias : op->file;
+			char **temp = list;
+			int ret;
+
+			ret = asprintf(&name, "%s:%s", alias, op->name);
+			if (ret < 0)
+				goto err;
+
+			list = realloc(list, count + 2);
+			if (!list) {
+				list = temp;
+				free(name);
+				goto err;
+			}
+			list[count++] = name;
+			list[count] = NULL;
+		}
+	}
+	return list;
+
+ err:
+	while (--count >= 0)
+		free(list[count]);
+	free(list);
+
+	return INVALID_PLUGIN_LIST_OPTION;
+}
+
+void tep_plugin_free_options_list(char **list)
+{
+	int i;
+
+	if (!list)
+		return;
+
+	if (list == INVALID_PLUGIN_LIST_OPTION)
+		return;
+
+	for (i = 0; list[i]; i++)
+		free(list[i]);
+
+	free(list);
+}
+
+static int
+update_option(const char *file, struct tep_plugin_option *option)
+{
+	struct trace_plugin_options *op;
+	char *plugin;
+	int ret = 0;
+
+	if (option->plugin_alias) {
+		plugin = strdup(option->plugin_alias);
+		if (!plugin)
+			return -1;
+	} else {
+		char *p;
+		plugin = strdup(file);
+		if (!plugin)
+			return -1;
+		p = strstr(plugin, ".");
+		if (p)
+			*p = '\0';
+	}
+
+	/* first look for named options */
+	for (op = trace_plugin_options; op; op = op->next) {
+		if (!op->plugin)
+			continue;
+		if (strcmp(op->plugin, plugin) != 0)
+			continue;
+		if (strcmp(op->option, option->name) != 0)
+			continue;
+
+		ret = update_option_value(option, op->value);
+		if (ret)
+			goto out;
+		break;
+	}
+
+	/* first look for unnamed options */
+	for (op = trace_plugin_options; op; op = op->next) {
+		if (op->plugin)
+			continue;
+		if (strcmp(op->option, option->name) != 0)
+			continue;
+
+		ret = update_option_value(option, op->value);
+		break;
+	}
+
+ out:
+	free(plugin);
+	return ret;
+}
+
+/**
+ * tep_plugin_add_options - Add a set of options by a plugin
+ * @name: The name of the plugin adding the options
+ * @options: The set of options being loaded
+ *
+ * Sets the options with the values that have been added by user.
+ */
+int tep_plugin_add_options(const char *name,
+			   struct tep_plugin_option *options)
+{
+	struct registered_plugin_options *reg;
+
+	reg = malloc(sizeof(*reg));
+	if (!reg)
+		return -1;
+	reg->next = registered_options;
+	reg->options = options;
+	registered_options = reg;
+
+	while (options->name) {
+		update_option(name, options);
+		options++;
+	}
+	return 0;
+}
+
+/**
+ * tep_plugin_remove_options - remove plugin options that were registered
+ * @options: Options to removed that were registered with tep_plugin_add_options
+ */
+void tep_plugin_remove_options(struct tep_plugin_option *options)
+{
+	struct registered_plugin_options **last;
+	struct registered_plugin_options *reg;
+
+	for (last = &registered_options; *last; last = &(*last)->next) {
+		if ((*last)->options == options) {
+			reg = *last;
+			*last = reg->next;
+			free(reg);
+			return;
+		}
+	}
+}
+
+static int parse_option_name(char **option, char **plugin)
+{
+	char *p;
+
+	*plugin = NULL;
+
+	if ((p = strstr(*option, ":"))) {
+		*plugin = *option;
+		*p = '\0';
+		*option = strdup(p + 1);
+		if (!*option)
+			return -1;
+	}
+	return 0;
+}
+
+static struct tep_plugin_option *
+find_registered_option(const char *plugin, const char *option)
+{
+	struct registered_plugin_options *reg;
+	struct tep_plugin_option *op;
+	const char *op_plugin;
+
+	for (reg = registered_options; reg; reg = reg->next) {
+		for (op = reg->options; op->name; op++) {
+			if (op->plugin_alias)
+				op_plugin = op->plugin_alias;
+			else
+				op_plugin = op->file;
+
+			if (plugin && strcmp(plugin, op_plugin) != 0)
+				continue;
+			if (strcmp(option, op->name) != 0)
+				continue;
+
+			return op;
+		}
+	}
+
+	return NULL;
+}
+
+static int process_option(const char *plugin, const char *option, const char *val)
+{
+	struct tep_plugin_option *op;
+
+	op = find_registered_option(plugin, option);
+	if (!op)
+		return 0;
+
+	return update_option_value(op, val);
+}
+
+/**
+ * tep_plugin_add_option - add an option/val pair to set plugin options
+ * @name: The name of the option (format: <plugin>:<option> or just <option>)
+ * @val: (optional) the value for the option
+ *
+ * Modify a plugin option. If @val is given than the value of the option
+ * is set (note, some options just take a boolean, so @val must be either
+ * "1" or "0" or "true" or "false").
+ */
+int tep_plugin_add_option(const char *name, const char *val)
+{
+	struct trace_plugin_options *op;
+	char *option_str;
+	char *plugin;
+
+	option_str = strdup(name);
+	if (!option_str)
+		return -ENOMEM;
+
+	if (parse_option_name(&option_str, &plugin) < 0)
+		return -ENOMEM;
+
+	/* If the option exists, update the val */
+	for (op = trace_plugin_options; op; op = op->next) {
+		/* Both must be NULL or not NULL */
+		if ((!plugin || !op->plugin) && plugin != op->plugin)
+			continue;
+		if (plugin && strcmp(plugin, op->plugin) != 0)
+			continue;
+		if (strcmp(op->option, option_str) != 0)
+			continue;
+
+		/* update option */
+		free(op->value);
+		if (val) {
+			op->value = strdup(val);
+			if (!op->value)
+				goto out_free;
+		} else
+			op->value = NULL;
+
+		/* plugin and option_str don't get freed at the end */
+		free(plugin);
+		free(option_str);
+
+		plugin = op->plugin;
+		option_str = op->option;
+		break;
+	}
+
+	/* If not found, create */
+	if (!op) {
+		op = malloc(sizeof(*op));
+		if (!op)
+			goto out_free;
+		memset(op, 0, sizeof(*op));
+		op->plugin = plugin;
+		op->option = option_str;
+		if (val) {
+			op->value = strdup(val);
+			if (!op->value) {
+				free(op);
+				goto out_free;
+			}
+		}
+		op->next = trace_plugin_options;
+		trace_plugin_options = op;
+	}
+
+	return process_option(plugin, option_str, val);
+
+out_free:
+	free(plugin);
+	free(option_str);
+	return -ENOMEM;
+}
+
+static void print_op_data(struct trace_seq *s, const char *name,
+			  const char *op)
+{
+	if (op)
+		trace_seq_printf(s, "%8s:\t%s\n", name, op);
+}
+
+/**
+ * tep_plugin_print_options - print out the registered plugin options
+ * @s: The trace_seq descriptor to write the plugin options into
+ *
+ * Writes a list of options into trace_seq @s.
+ */
+void tep_plugin_print_options(struct trace_seq *s)
+{
+	struct registered_plugin_options *reg;
+	struct tep_plugin_option *op;
+
+	for (reg = registered_options; reg; reg = reg->next) {
+		if (reg != registered_options)
+			trace_seq_printf(s, "============\n");
+		for (op = reg->options; op->name; op++) {
+			if (op != reg->options)
+				trace_seq_printf(s, "------------\n");
+			print_op_data(s, "file", op->file);
+			print_op_data(s, "plugin", op->plugin_alias);
+			print_op_data(s, "option", op->name);
+			print_op_data(s, "desc", op->description);
+			print_op_data(s, "value", op->value);
+			trace_seq_printf(s, "%8s:\t%d\n", "set", op->set);
+		}
+	}
+}
+
+/**
+ * tep_print_plugins - print out the list of plugins loaded
+ * @s: the trace_seq descripter to write to
+ * @prefix: The prefix string to add before listing the option name
+ * @suffix: The suffix string ot append after the option name
+ * @list: The list of plugins (usually returned by tep_load_plugins()
+ *
+ * Writes to the trace_seq @s the list of plugins (files) that is
+ * returned by tep_load_plugins(). Use @prefix and @suffix for formating:
+ * @prefix = "  ", @suffix = "\n".
+ */
+void tep_print_plugins(struct trace_seq *s,
+		       const char *prefix, const char *suffix,
+		       const struct tep_plugin_list *list)
+{
+	while (list) {
+		trace_seq_printf(s, "%s%s%s", prefix, list->name, suffix);
+		list = list->next;
+	}
+}
+
+static void
+load_plugin(struct tep_handle *tep, const char *path,
+	    const char *file, void *data)
+{
+	struct tep_plugin_list **plugin_list = data;
+	struct tep_plugin_option *options;
+	tep_plugin_load_func func;
+	struct tep_plugin_list *list;
+	const char *alias;
+	char *plugin;
+	void *handle;
+	int ret;
+
+	ret = asprintf(&plugin, "%s/%s", path, file);
+	if (ret < 0) {
+		tep_warning("could not allocate plugin memory\n");
+		return;
+	}
+
+	handle = dlopen(plugin, RTLD_NOW | RTLD_GLOBAL);
+	if (!handle) {
+		tep_warning("could not load plugin '%s'\n%s\n",
+			    plugin, dlerror());
+		goto out_free;
+	}
+
+	alias = dlsym(handle, TEP_PLUGIN_ALIAS_NAME);
+	if (!alias)
+		alias = file;
+
+	options = dlsym(handle, TEP_PLUGIN_OPTIONS_NAME);
+	if (options) {
+		while (options->name) {
+			ret = update_option(alias, options);
+			if (ret < 0)
+				goto out_free;
+			options++;
+		}
+	}
+
+	func = dlsym(handle, TEP_PLUGIN_LOADER_NAME);
+	if (!func) {
+		tep_warning("could not find func '%s' in plugin '%s'\n%s\n",
+			    TEP_PLUGIN_LOADER_NAME, plugin, dlerror());
+		goto out_free;
+	}
+
+	list = malloc(sizeof(*list));
+	if (!list) {
+		tep_warning("could not allocate plugin memory\n");
+		goto out_free;
+	}
+
+	list->next = *plugin_list;
+	list->handle = handle;
+	list->name = plugin;
+	*plugin_list = list;
+
+	tep_info("registering plugin: %s", plugin);
+	func(tep);
+	return;
+
+ out_free:
+	free(plugin);
+}
+
+static void
+load_plugins_dir(struct tep_handle *tep, const char *suffix,
+		 const char *path,
+		 void (*load_plugin)(struct tep_handle *tep,
+				     const char *path,
+				     const char *name,
+				     void *data),
+		 void *data)
+{
+	struct dirent *dent;
+	struct stat st;
+	DIR *dir;
+	int ret;
+
+	ret = stat(path, &st);
+	if (ret < 0)
+		return;
+
+	if (!S_ISDIR(st.st_mode))
+		return;
+
+	dir = opendir(path);
+	if (!dir)
+		return;
+
+	while ((dent = readdir(dir))) {
+		const char *name = dent->d_name;
+
+		if (strcmp(name, ".") == 0 ||
+		    strcmp(name, "..") == 0)
+			continue;
+
+		/* Only load plugins that end in suffix */
+		if (strcmp(name + (strlen(name) - strlen(suffix)), suffix) != 0)
+			continue;
+
+		load_plugin(tep, path, name, data);
+	}
+
+	closedir(dir);
+}
+
+/**
+ * tep_load_plugins_hook - call a user specified callback to load a plugin
+ * @tep: handler to traceevent context
+ * @suffix: filter only plugin files with given suffix
+ * @load_plugin: user specified callback, called for each plugin file
+ * @data: custom context, passed to @load_plugin
+ *
+ * Searches for traceevent plugin files and calls @load_plugin for each
+ * The order of plugins search is:
+ *  - Directories, specified in @tep->plugins_dir and priority TEP_PLUGIN_FIRST
+ *  - Directory, specified at compile time with PLUGIN_TRACEEVENT_DIR
+ *  - Directory, specified by environment variable TRACEEVENT_PLUGIN_DIR
+ *  - In user's home: ~/.local/lib/traceevent/plugins/
+ *  - Directories, specified in @tep->plugins_dir and priority TEP_PLUGIN_LAST
+ *
+ */
+void tep_load_plugins_hook(struct tep_handle *tep, const char *suffix,
+			   void (*load_plugin)(struct tep_handle *tep,
+					       const char *path,
+					       const char *name,
+					       void *data),
+			   void *data)
+{
+	struct tep_plugins_dir *dir = NULL;
+	char *home;
+	char *path;
+	char *envdir;
+	int ret;
+
+	if (tep && tep->flags & TEP_DISABLE_PLUGINS)
+		return;
+
+	if (tep)
+		dir = tep->plugins_dir;
+	while (dir) {
+		if (dir->prio == TEP_PLUGIN_FIRST)
+			load_plugins_dir(tep, suffix, dir->path,
+					 load_plugin, data);
+		dir = dir->next;
+	}
+
+	/*
+	 * If a system plugin directory was defined,
+	 * check that first.
+	 */
+#ifdef PLUGIN_DIR
+	if (!tep || !(tep->flags & TEP_DISABLE_SYS_PLUGINS))
+		load_plugins_dir(tep, suffix, PLUGIN_DIR,
+				 load_plugin, data);
+#endif
+
+	/*
+	 * Next let the environment-set plugin directory
+	 * override the system defaults.
+	 */
+	envdir = getenv("TRACEEVENT_PLUGIN_DIR");
+	if (envdir)
+		load_plugins_dir(tep, suffix, envdir, load_plugin, data);
+
+	/*
+	 * Now let the home directory override the environment
+	 * or system defaults.
+	 */
+	home = getenv("HOME");
+	if (!home)
+		return;
+
+	ret = asprintf(&path, "%s/%s", home, LOCAL_PLUGIN_DIR);
+	if (ret < 0) {
+		tep_warning("could not allocate plugin memory\n");
+		return;
+	}
+
+	load_plugins_dir(tep, suffix, path, load_plugin, data);
+
+	if (tep)
+		dir = tep->plugins_dir;
+	while (dir) {
+		if (dir->prio == TEP_PLUGIN_LAST)
+			load_plugins_dir(tep, suffix, dir->path,
+					 load_plugin, data);
+		dir = dir->next;
+	}
+
+	free(path);
+}
+
+struct tep_plugin_list*
+tep_load_plugins(struct tep_handle *tep)
+{
+	struct tep_plugin_list *list = NULL;
+
+	tep_load_plugins_hook(tep, ".so", load_plugin, &list);
+	return list;
+}
+
+/**
+ * tep_add_plugin_path - Add a new plugin directory.
+ * @tep: Trace event handler.
+ * @path: Path to a directory. All plugin files in that
+ *	  directory will be loaded.
+ *@prio: Load priority of the plugins in that directory.
+ *
+ * Returns -1 in case of an error, 0 otherwise.
+ */
+int tep_add_plugin_path(struct tep_handle *tep, char *path,
+			enum tep_plugin_load_priority prio)
+{
+	struct tep_plugins_dir *dir;
+
+	if (!tep || !path)
+		return -1;
+
+	dir = calloc(1, sizeof(*dir));
+	if (!dir)
+		return -1;
+
+	dir->path = strdup(path);
+	if (!dir->path) {
+		free(dir);
+		return -1;
+	}
+	dir->prio = prio;
+	dir->next = tep->plugins_dir;
+	tep->plugins_dir = dir;
+
+	return 0;
+}
+
+__hidden void free_tep_plugin_paths(struct tep_handle *tep)
+{
+	struct tep_plugins_dir *dir;
+
+	if (!tep)
+		return;
+
+	dir = tep->plugins_dir;
+	while (dir) {
+		tep->plugins_dir = tep->plugins_dir->next;
+		free(dir->path);
+		free(dir);
+		dir = tep->plugins_dir;
+	}
+}
+
+void
+tep_unload_plugins(struct tep_plugin_list *plugin_list, struct tep_handle *tep)
+{
+	tep_plugin_unload_func func;
+	struct tep_plugin_list *list;
+
+	while (plugin_list) {
+		list = plugin_list;
+		plugin_list = list->next;
+		func = dlsym(list->handle, TEP_PLUGIN_UNLOADER_NAME);
+		if (func)
+			func(tep);
+		dlclose(list->handle);
+		free(list->name);
+		free(list);
+	}
+}
diff --git a/src/kbuffer-parse.c b/src/kbuffer-parse.c
new file mode 100644
index 0000000..390a789
--- /dev/null
+++ b/src/kbuffer-parse.c
@@ -0,0 +1,848 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ *
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+
+#include <sys/utsname.h>
+
+#include "kbuffer.h"
+
+#define MISSING_EVENTS (1UL << 31)
+#define MISSING_STORED (1UL << 30)
+
+#define COMMIT_MASK ((1 << 27) - 1)
+
+/* Absolute time stamps do not have the 5 MSB, take from the real time stamp */
+#define TS_MSB		(0xf8ULL << 56)
+
+enum {
+	KBUFFER_FL_HOST_BIG_ENDIAN	= (1<<0),
+	KBUFFER_FL_BIG_ENDIAN		= (1<<1),
+	KBUFFER_FL_LONG_8		= (1<<2),
+	KBUFFER_FL_OLD_FORMAT		= (1<<3),
+};
+
+#define ENDIAN_MASK (KBUFFER_FL_HOST_BIG_ENDIAN | KBUFFER_FL_BIG_ENDIAN)
+
+/** kbuffer
+ * @timestamp		- timestamp of current event
+ * @lost_events		- # of lost events between this subbuffer and previous
+ * @flags		- special flags of the kbuffer
+ * @subbuffer		- pointer to the sub-buffer page
+ * @data		- pointer to the start of data on the sub-buffer page
+ * @index		- index from @data to the @curr event data
+ * @curr		- offset from @data to the start of current event
+ *			   (includes metadata)
+ * @next		- offset from @data to the start of next event
+ * @size		- The size of data on @data
+ * @start		- The offset from @subbuffer where @data lives
+ * @first		- The offset from @subbuffer where the first non time stamp event lives
+ *
+ * @read_4		- Function to read 4 raw bytes (may swap)
+ * @read_8		- Function to read 8 raw bytes (may swap)
+ * @read_long		- Function to read a long word (4 or 8 bytes with needed swap)
+ */
+struct kbuffer {
+	unsigned long long 	timestamp;
+	long long		lost_events;
+	unsigned long		flags;
+	void			*subbuffer;
+	void			*data;
+	unsigned int		index;
+	unsigned int		curr;
+	unsigned int		next;
+	unsigned int		size;
+	unsigned int		start;
+	unsigned int		first;
+
+	unsigned int (*read_4)(void *ptr);
+	unsigned long long (*read_8)(void *ptr);
+	unsigned long long (*read_long)(struct kbuffer *kbuf, void *ptr);
+	int (*next_event)(struct kbuffer *kbuf);
+};
+
+static void *zmalloc(size_t size)
+{
+	return calloc(1, size);
+}
+
+static int host_is_bigendian(void)
+{
+	unsigned char str[] = { 0x1, 0x2, 0x3, 0x4 };
+	unsigned int *ptr;
+
+	ptr = (unsigned int *)str;
+	return *ptr == 0x01020304;
+}
+
+static int do_swap(struct kbuffer *kbuf)
+{
+	return ((kbuf->flags & KBUFFER_FL_HOST_BIG_ENDIAN) + kbuf->flags) &
+		ENDIAN_MASK;
+}
+
+static unsigned long long __read_8(void *ptr)
+{
+	unsigned long long data = *(unsigned long long *)ptr;
+
+	return data;
+}
+
+static unsigned long long __read_8_sw(void *ptr)
+{
+	unsigned long long data = *(unsigned long long *)ptr;
+	unsigned long long swap;
+
+	swap = ((data & 0xffULL) << 56) |
+		((data & (0xffULL << 8)) << 40) |
+		((data & (0xffULL << 16)) << 24) |
+		((data & (0xffULL << 24)) << 8) |
+		((data & (0xffULL << 32)) >> 8) |
+		((data & (0xffULL << 40)) >> 24) |
+		((data & (0xffULL << 48)) >> 40) |
+		((data & (0xffULL << 56)) >> 56);
+
+	return swap;
+}
+
+static unsigned int __read_4(void *ptr)
+{
+	unsigned int data = *(unsigned int *)ptr;
+
+	return data;
+}
+
+static unsigned int __read_4_sw(void *ptr)
+{
+	unsigned int data = *(unsigned int *)ptr;
+	unsigned int swap;
+
+	swap = ((data & 0xffULL) << 24) |
+		((data & (0xffULL << 8)) << 8) |
+		((data & (0xffULL << 16)) >> 8) |
+		((data & (0xffULL << 24)) >> 24);
+
+	return swap;
+}
+
+static unsigned long long read_8(struct kbuffer *kbuf, void *ptr)
+{
+	return kbuf->read_8(ptr);
+}
+
+static unsigned int read_4(struct kbuffer *kbuf, void *ptr)
+{
+	return kbuf->read_4(ptr);
+}
+
+static unsigned long long __read_long_8(struct kbuffer *kbuf, void *ptr)
+{
+	return kbuf->read_8(ptr);
+}
+
+static unsigned long long __read_long_4(struct kbuffer *kbuf, void *ptr)
+{
+	return kbuf->read_4(ptr);
+}
+
+static unsigned long long read_long(struct kbuffer *kbuf, void *ptr)
+{
+	return kbuf->read_long(kbuf, ptr);
+}
+
+static int calc_index(struct kbuffer *kbuf, void *ptr)
+{
+	return (unsigned long)ptr - (unsigned long)kbuf->data;
+}
+
+static int __next_event(struct kbuffer *kbuf);
+
+/*
+ * Just because sizeof(long) is 4 bytes, doesn't mean the OS isn't
+ * 64bits
+ */
+static bool host_is_32bit(void)
+{
+	struct utsname buf;
+	int ret;
+
+	ret = uname(&buf);
+	if (ret < 0) {
+		/* Oh well, just assume it is 32 bit */
+		return true;
+	}
+	/* If the uname machine value contains 64, assume the kernel is 64 bit */
+	return strstr(buf.machine, "64") == NULL;
+}
+
+/**
+ * kbuffer_alloc - allocat a new kbuffer
+ * @size;	enum to denote size of word
+ * @endian:	enum to denote endianness
+ *
+ * Allocates and returns a new kbuffer.
+ */
+struct kbuffer *
+kbuffer_alloc(enum kbuffer_long_size size, enum kbuffer_endian endian)
+{
+	struct kbuffer *kbuf;
+	int flags = 0;
+
+	switch (size) {
+	case KBUFFER_LSIZE_4:
+		break;
+	case KBUFFER_LSIZE_SAME_AS_HOST:
+		if (sizeof(long) != 8 && host_is_32bit())
+			break;
+		/* fallthrough */
+	case KBUFFER_LSIZE_8:
+		flags |= KBUFFER_FL_LONG_8;
+		break;
+	default:
+		return NULL;
+	}
+
+	switch (endian) {
+	case KBUFFER_ENDIAN_LITTLE:
+	case KBUFFER_ENDIAN_SAME_AS_HOST:
+		break;
+	case KBUFFER_ENDIAN_BIG:
+		flags |= KBUFFER_FL_BIG_ENDIAN;
+		break;
+	default:
+		return NULL;
+	}
+
+	kbuf = zmalloc(sizeof(*kbuf));
+	if (!kbuf)
+		return NULL;
+
+	kbuf->flags = flags;
+
+	if (host_is_bigendian()) {
+		if (endian == KBUFFER_ENDIAN_SAME_AS_HOST)
+			flags |= KBUFFER_FL_BIG_ENDIAN;
+		kbuf->flags |= KBUFFER_FL_HOST_BIG_ENDIAN;
+	}
+
+	if (do_swap(kbuf)) {
+		kbuf->read_8 = __read_8_sw;
+		kbuf->read_4 = __read_4_sw;
+	} else {
+		kbuf->read_8 = __read_8;
+		kbuf->read_4 = __read_4;
+	}
+
+	if (kbuf->flags & KBUFFER_FL_LONG_8)
+		kbuf->read_long = __read_long_8;
+	else
+		kbuf->read_long = __read_long_4;
+
+	/* May be changed by kbuffer_set_old_format() */
+	kbuf->next_event = __next_event;
+
+	return kbuf;
+}
+
+/** kbuffer_free - free an allocated kbuffer
+ * @kbuf:	The kbuffer to free
+ *
+ * Can take NULL as a parameter.
+ */
+void kbuffer_free(struct kbuffer *kbuf)
+{
+	free(kbuf);
+}
+
+static unsigned int type4host(struct kbuffer *kbuf,
+			      unsigned int type_len_ts)
+{
+	if (kbuf->flags & KBUFFER_FL_BIG_ENDIAN)
+		return (type_len_ts >> 29) & 3;
+	else
+		return type_len_ts & 3;
+}
+
+static unsigned int len4host(struct kbuffer *kbuf,
+			     unsigned int type_len_ts)
+{
+	if (kbuf->flags & KBUFFER_FL_BIG_ENDIAN)
+		return (type_len_ts >> 27) & 7;
+	else
+		return (type_len_ts >> 2) & 7;
+}
+
+static unsigned int type_len4host(struct kbuffer *kbuf,
+				  unsigned int type_len_ts)
+{
+	if (kbuf->flags & KBUFFER_FL_BIG_ENDIAN)
+		return (type_len_ts >> 27) & ((1 << 5) - 1);
+	else
+		return type_len_ts & ((1 << 5) - 1);
+}
+
+static unsigned int ts4host(struct kbuffer *kbuf,
+			    unsigned int type_len_ts)
+{
+	if (kbuf->flags & KBUFFER_FL_BIG_ENDIAN)
+		return type_len_ts & ((1 << 27) - 1);
+	else
+		return type_len_ts >> 5;
+}
+
+/*
+ * Linux 2.6.30 and earlier (not much ealier) had a different
+ * ring buffer format. It should be obsolete, but we handle it anyway.
+ */
+enum old_ring_buffer_type {
+	OLD_RINGBUF_TYPE_PADDING,
+	OLD_RINGBUF_TYPE_TIME_EXTEND,
+	OLD_RINGBUF_TYPE_TIME_STAMP,
+	OLD_RINGBUF_TYPE_DATA,
+};
+
+static unsigned int old_update_pointers(struct kbuffer *kbuf)
+{
+	unsigned long long extend;
+	unsigned int type_len_ts;
+	unsigned int type;
+	unsigned int len;
+	unsigned int delta;
+	unsigned int length;
+	void *ptr = kbuf->data + kbuf->curr;
+
+	type_len_ts = read_4(kbuf, ptr);
+	ptr += 4;
+
+	type = type4host(kbuf, type_len_ts);
+	len = len4host(kbuf, type_len_ts);
+	delta = ts4host(kbuf, type_len_ts);
+
+	switch (type) {
+	case OLD_RINGBUF_TYPE_PADDING:
+		kbuf->next = kbuf->size;
+		return 0;
+
+	case OLD_RINGBUF_TYPE_TIME_EXTEND:
+		extend = read_4(kbuf, ptr);
+		extend <<= TS_SHIFT;
+		extend += delta;
+		delta = extend;
+		ptr += 4;
+		length = 0;
+		break;
+
+	case OLD_RINGBUF_TYPE_TIME_STAMP:
+		/* should never happen! */
+		kbuf->curr = kbuf->size;
+		kbuf->next = kbuf->size;
+		kbuf->index = kbuf->size;
+		return -1;
+	default:
+		if (len)
+			length = len * 4;
+		else {
+			length = read_4(kbuf, ptr);
+			length -= 4;
+			ptr += 4;
+		}
+		break;
+	}
+
+	kbuf->timestamp += delta;
+	kbuf->index = calc_index(kbuf, ptr);
+	kbuf->next = kbuf->index + length;
+
+	return type;
+}
+
+static int __old_next_event(struct kbuffer *kbuf)
+{
+	int type;
+
+	do {
+		kbuf->curr = kbuf->next;
+		if (kbuf->next >= kbuf->size)
+			return -1;
+		type = old_update_pointers(kbuf);
+	} while (type == OLD_RINGBUF_TYPE_TIME_EXTEND || type == OLD_RINGBUF_TYPE_PADDING);
+
+	return 0;
+}
+
+static unsigned int
+translate_data(struct kbuffer *kbuf, void *data, void **rptr,
+	       unsigned long long *delta, int *length)
+{
+	unsigned long long extend, msb = 0;
+	unsigned int type_len_ts;
+	unsigned int type_len;
+
+	type_len_ts = read_4(kbuf, data);
+	data += 4;
+
+	type_len = type_len4host(kbuf, type_len_ts);
+	*delta = ts4host(kbuf, type_len_ts);
+
+	switch (type_len) {
+	case KBUFFER_TYPE_PADDING:
+		*length = read_4(kbuf, data);
+		break;
+
+	case KBUFFER_TYPE_TIME_STAMP:
+		msb = kbuf->timestamp & TS_MSB;
+		/* fall through */
+	case KBUFFER_TYPE_TIME_EXTEND:
+		extend = read_4(kbuf, data);
+		data += 4;
+		extend <<= TS_SHIFT;
+		extend += *delta;
+		*delta = extend | msb;
+		*length = 0;
+		break;
+
+	case 0:
+		*length = read_4(kbuf, data) - 4;
+		*length = (*length + 3) & ~3;
+		data += 4;
+		break;
+	default:
+		*length = type_len * 4;
+		break;
+	}
+
+	*rptr = data;
+
+	return type_len;
+}
+
+static unsigned int update_pointers(struct kbuffer *kbuf)
+{
+	unsigned long long delta;
+	unsigned int type_len;
+	int length;
+	void *ptr = kbuf->data + kbuf->curr;
+
+	type_len = translate_data(kbuf, ptr, &ptr, &delta, &length);
+
+	if (type_len == KBUFFER_TYPE_TIME_STAMP)
+		kbuf->timestamp = delta;
+	else
+		kbuf->timestamp += delta;
+
+	kbuf->index = calc_index(kbuf, ptr);
+	kbuf->next = kbuf->index + length;
+
+	return type_len;
+}
+
+/**
+ * kbuffer_translate_data - read raw data to get a record
+ * @swap:	Set to 1 if bytes in words need to be swapped when read
+ * @data:	The raw data to read
+ * @size:	Address to store the size of the event data.
+ *
+ * Returns a pointer to the event data. To determine the entire
+ * record size (record metadata + data) just add the difference between
+ * @data and the returned value to @size.
+ */
+void *kbuffer_translate_data(int swap, void *data, unsigned int *size)
+{
+	unsigned long long delta;
+	struct kbuffer kbuf;
+	int type_len;
+	int length;
+	void *ptr;
+
+	if (swap) {
+		kbuf.read_8 = __read_8_sw;
+		kbuf.read_4 = __read_4_sw;
+		kbuf.flags = host_is_bigendian() ? 0 : KBUFFER_FL_BIG_ENDIAN;
+	} else {
+		kbuf.read_8 = __read_8;
+		kbuf.read_4 = __read_4;
+		kbuf.flags = host_is_bigendian() ? KBUFFER_FL_BIG_ENDIAN: 0;
+	}
+
+	type_len = translate_data(&kbuf, data, &ptr, &delta, &length);
+	switch (type_len) {
+	case KBUFFER_TYPE_PADDING:
+	case KBUFFER_TYPE_TIME_EXTEND:
+	case KBUFFER_TYPE_TIME_STAMP:
+		return NULL;
+	}
+
+	*size = length;
+
+	return ptr;
+}
+
+static int __next_event(struct kbuffer *kbuf)
+{
+	int type;
+
+	do {
+		kbuf->curr = kbuf->next;
+		if (kbuf->next >= kbuf->size)
+			return -1;
+		type = update_pointers(kbuf);
+	} while (type == KBUFFER_TYPE_TIME_EXTEND ||
+		 type == KBUFFER_TYPE_TIME_STAMP ||
+		 type == KBUFFER_TYPE_PADDING);
+
+	return 0;
+}
+
+static int next_event(struct kbuffer *kbuf)
+{
+	return kbuf->next_event(kbuf);
+}
+
+/**
+ * kbuffer_next_event - increment the current pointer
+ * @kbuf:	The kbuffer to read
+ * @ts:		Address to store the next record's timestamp (may be NULL to ignore)
+ *
+ * Increments the pointers into the subbuffer of the kbuffer to point to the
+ * next event so that the next kbuffer_read_event() will return a
+ * new event.
+ *
+ * Returns the data of the next event if a new event exists on the subbuffer,
+ * NULL otherwise.
+ */
+void *kbuffer_next_event(struct kbuffer *kbuf, unsigned long long *ts)
+{
+	int ret;
+
+	if (!kbuf || !kbuf->subbuffer)
+		return NULL;
+
+	ret = next_event(kbuf);
+	if (ret < 0)
+		return NULL;
+
+	if (ts)
+		*ts = kbuf->timestamp;
+
+	return kbuf->data + kbuf->index;
+}
+
+/**
+ * kbuffer_load_subbuffer - load a new subbuffer into the kbuffer
+ * @kbuf:	The kbuffer to load
+ * @subbuffer:	The subbuffer to load into @kbuf.
+ *
+ * Load a new subbuffer (page) into @kbuf. This will reset all
+ * the pointers and update the @kbuf timestamp. The next read will
+ * return the first event on @subbuffer.
+ *
+ * Returns 0 on succes, -1 otherwise.
+ */
+int kbuffer_load_subbuffer(struct kbuffer *kbuf, void *subbuffer)
+{
+	unsigned long long flags;
+	void *ptr = subbuffer;
+
+	if (!kbuf || !subbuffer)
+		return -1;
+
+	kbuf->subbuffer = subbuffer;
+
+	kbuf->timestamp = read_8(kbuf, ptr);
+	ptr += 8;
+
+	kbuf->curr = 0;
+
+	if (kbuf->flags & KBUFFER_FL_LONG_8)
+		kbuf->start = 16;
+	else
+		kbuf->start = 12;
+
+	kbuf->data = subbuffer + kbuf->start;
+
+	flags = read_long(kbuf, ptr);
+	kbuf->size = (unsigned int)flags & COMMIT_MASK;
+
+	if (flags & MISSING_EVENTS) {
+		if (flags & MISSING_STORED) {
+			ptr = kbuf->data + kbuf->size;
+			kbuf->lost_events = read_long(kbuf, ptr);
+		} else
+			kbuf->lost_events = -1;
+	} else
+		kbuf->lost_events = 0;
+
+	kbuf->index = 0;
+	kbuf->next = 0;
+
+	next_event(kbuf);
+
+	/* save the first record from the page */
+	kbuf->first = kbuf->curr;
+
+	return 0;
+}
+
+/**
+ * kbuffer_subbuf_timestamp - read the timestamp from a sub buffer
+ * @kbuf:      The kbuffer to load
+ * @subbuf:    The subbuffer to read from.
+ *
+ * Return the timestamp from a subbuffer.
+ */
+unsigned long long kbuffer_subbuf_timestamp(struct kbuffer *kbuf, void *subbuf)
+{
+	return kbuf->read_8(subbuf);
+}
+
+/**
+ * kbuffer_ptr_delta - read the delta field from a record
+ * @kbuf:      The kbuffer to load
+ * @ptr:       The record in the buffe.
+ *
+ * Return the timestamp delta from a record
+ */
+unsigned int kbuffer_ptr_delta(struct kbuffer *kbuf, void *ptr)
+{
+	unsigned int type_len_ts;
+
+	type_len_ts = read_4(kbuf, ptr);
+	return ts4host(kbuf, type_len_ts);
+}
+
+
+/**
+ * kbuffer_read_event - read the next event in the kbuffer subbuffer
+ * @kbuf:	The kbuffer to read from
+ * @ts:		The address to store the timestamp of the event (may be NULL to ignore)
+ *
+ * Returns a pointer to the data part of the current event.
+ * NULL if no event is left on the subbuffer.
+ */
+void *kbuffer_read_event(struct kbuffer *kbuf, unsigned long long *ts)
+{
+	if (!kbuf || !kbuf->subbuffer)
+		return NULL;
+
+	if (kbuf->curr >= kbuf->size)
+		return NULL;
+
+	if (ts)
+		*ts = kbuf->timestamp;
+	return kbuf->data + kbuf->index;
+}
+
+/**
+ * kbuffer_timestamp - Return the timestamp of the current event
+ * @kbuf:	The kbuffer to read from
+ *
+ * Returns the timestamp of the current (next) event.
+ */
+unsigned long long kbuffer_timestamp(struct kbuffer *kbuf)
+{
+	return kbuf->timestamp;
+}
+
+/**
+ * kbuffer_read_at_offset - read the event that is at offset
+ * @kbuf:	The kbuffer to read from
+ * @offset:	The offset into the subbuffer
+ * @ts:		The address to store the timestamp of the event (may be NULL to ignore)
+ *
+ * The @offset must be an index from the @kbuf subbuffer beginning.
+ * If @offset is bigger than the stored subbuffer, NULL will be returned.
+ *
+ * Returns the data of the record that is at @offset. Note, @offset does
+ * not need to be the start of the record, the offset just needs to be
+ * in the record (or beginning of it).
+ *
+ * Note, the kbuf timestamp and pointers are updated to the
+ * returned record. That is, kbuffer_read_event() will return the same
+ * data and timestamp, and kbuffer_next_event() will increment from
+ * this record.
+ */
+void *kbuffer_read_at_offset(struct kbuffer *kbuf, int offset,
+			     unsigned long long *ts)
+{
+	void *data;
+
+	if (offset < kbuf->start)
+		offset = 0;
+	else
+		offset -= kbuf->start;
+
+	/* Reset the buffer */
+	kbuffer_load_subbuffer(kbuf, kbuf->subbuffer);
+	data = kbuffer_read_event(kbuf, ts);
+
+	while (kbuf->curr < offset) {
+		data = kbuffer_next_event(kbuf, ts);
+		if (!data)
+			break;
+	}
+
+	return data;
+}
+
+/**
+ * kbuffer_subbuffer_size - the size of the loaded subbuffer
+ * @kbuf:	The kbuffer to read from
+ *
+ * Returns the size of the subbuffer. Note, this size is
+ * where the last event resides. The stored subbuffer may actually be
+ * bigger due to padding and such.
+ */
+int kbuffer_subbuffer_size(struct kbuffer *kbuf)
+{
+	return kbuf->size;
+}
+
+/**
+ * kbuffer_curr_index - Return the index of the record
+ * @kbuf:	The kbuffer to read from
+ *
+ * Returns the index from the start of the data part of
+ * the subbuffer to the current location. Note this is not
+ * from the start of the subbuffer. An index of zero will
+ * point to the first record. Use kbuffer_curr_offset() for
+ * the actually offset (that can be used by kbuffer_read_at_offset())
+ */
+int kbuffer_curr_index(struct kbuffer *kbuf)
+{
+	return kbuf->curr;
+}
+
+/**
+ * kbuffer_curr_offset - Return the offset of the record
+ * @kbuf:	The kbuffer to read from
+ *
+ * Returns the offset from the start of the subbuffer to the
+ * current location.
+ */
+int kbuffer_curr_offset(struct kbuffer *kbuf)
+{
+	return kbuf->curr + kbuf->start;
+}
+
+/**
+ * kbuffer_event_size - return the size of the event data
+ * @kbuf:	The kbuffer to read
+ *
+ * Returns the size of the event data (the payload not counting
+ * the meta data of the record) of the current event.
+ */
+int kbuffer_event_size(struct kbuffer *kbuf)
+{
+	return kbuf->next - kbuf->index;
+}
+
+/**
+ * kbuffer_curr_size - return the size of the entire record
+ * @kbuf:	The kbuffer to read
+ *
+ * Returns the size of the entire record (meta data and payload)
+ * of the current event.
+ */
+int kbuffer_curr_size(struct kbuffer *kbuf)
+{
+	return kbuf->next - kbuf->curr;
+}
+
+/**
+ * kbuffer_missed_events - return the # of missed events from last event.
+ * @kbuf: 	The kbuffer to read from
+ *
+ * Returns the # of missed events (if recorded) before the current
+ * event. Note, only events on the beginning of a subbuffer can
+ * have missed events, all other events within the buffer will be
+ * zero.
+ */
+int kbuffer_missed_events(struct kbuffer *kbuf)
+{
+	/* Only the first event can have missed events */
+	if (kbuf->curr)
+		return 0;
+
+	return kbuf->lost_events;
+}
+
+/**
+ * kbuffer_set_old_forma - set the kbuffer to use the old format parsing
+ * @kbuf:	The kbuffer to set
+ *
+ * This is obsolete (or should be). The first kernels to use the
+ * new ring buffer had a slightly different ring buffer format
+ * (2.6.30 and earlier). It is still somewhat supported by kbuffer,
+ * but should not be counted on in the future.
+ */
+void kbuffer_set_old_format(struct kbuffer *kbuf)
+{
+	kbuf->flags |= KBUFFER_FL_OLD_FORMAT;
+
+	kbuf->next_event = __old_next_event;
+}
+
+/**
+ * kbuffer_start_of_data - return offset of where data starts on subbuffer
+ * @kbuf:	The kbuffer
+ *
+ * Returns the location on the subbuffer where the data starts.
+ */
+int kbuffer_start_of_data(struct kbuffer *kbuf)
+{
+	return kbuf->first + kbuf->start;
+}
+
+/**
+ * kbuffer_raw_get - get raw buffer info
+ * @kbuf:	The kbuffer
+ * @subbuf:	Start of mapped subbuffer
+ * @info:	Info descriptor to fill in
+ *
+ * For debugging. This can return internals of the ring buffer.
+ * Expects to have info->next set to what it will read.
+ * The type, length and timestamp delta will be filled in, and
+ * @info->next will be updated to the next element.
+ * The @subbuf is used to know if the info is passed the end of
+ * data and NULL will be returned if it is.
+ */
+struct kbuffer_raw_info *
+kbuffer_raw_get(struct kbuffer *kbuf, void *subbuf, struct kbuffer_raw_info *info)
+{
+	unsigned long long flags;
+	unsigned long long delta;
+	unsigned int type_len;
+	unsigned int size;
+	int start;
+	int length;
+	void *ptr = info->next;
+
+	if (!kbuf || !subbuf)
+		return NULL;
+
+	if (kbuf->flags & KBUFFER_FL_LONG_8)
+		start = 16;
+	else
+		start = 12;
+
+	flags = read_long(kbuf, subbuf + 8);
+	size = (unsigned int)flags & COMMIT_MASK;
+
+	if (ptr < subbuf || ptr >= subbuf + start + size)
+		return NULL;
+
+	type_len = translate_data(kbuf, ptr, &ptr, &delta, &length);
+
+	info->next = ptr + length;
+
+	info->type = type_len;
+	info->delta = delta;
+	info->length = length;
+
+	return info;
+}
diff --git a/src/parse-filter.c b/src/parse-filter.c
new file mode 100644
index 0000000..e448ee2
--- /dev/null
+++ b/src/parse-filter.c
@@ -0,0 +1,2283 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ *
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <errno.h>
+#include <sys/types.h>
+
+#include "event-parse.h"
+#include "event-parse-local.h"
+#include "event-utils.h"
+
+#define COMM "COMM"
+#define CPU "CPU"
+
+static struct tep_format_field comm = {
+	.name = "COMM",
+};
+
+static struct tep_format_field cpu = {
+	.name = "CPU",
+};
+
+struct event_list {
+	struct event_list	*next;
+	struct tep_event	*event;
+};
+
+static void show_error(struct tep_handle *tep, char *error_buf, const char *fmt, ...)
+{
+	unsigned long long index;
+	const char *input;
+	va_list ap;
+	int len;
+	int i;
+
+	input = get_input_buf(tep);
+	index = get_input_buf_ptr(tep);
+	len = input ? strlen(input) : 0;
+
+	if (len) {
+		strcpy(error_buf, input);
+		error_buf[len] = '\n';
+		for (i = 1; i < len && i < index; i++)
+			error_buf[len+i] = ' ';
+		error_buf[len + i] = '^';
+		error_buf[len + i + 1] = '\n';
+		len += i+2;
+	}
+
+	va_start(ap, fmt);
+	vsnprintf(error_buf + len, TEP_FILTER_ERROR_BUFSZ - len, fmt, ap);
+	va_end(ap);
+}
+
+static enum tep_event_type filter_read_token(struct tep_handle *tep, char **tok)
+{
+	enum tep_event_type type;
+	char *token = NULL;
+
+	do {
+		free_token(token);
+		type = read_token(tep, &token);
+	} while (type == TEP_EVENT_NEWLINE || type == TEP_EVENT_SPACE);
+
+	/* If token is = or ! check to see if the next char is ~ */
+	if (token &&
+	    (strcmp(token, "=") == 0 || strcmp(token, "!") == 0) &&
+	    peek_char(tep) == '~') {
+		/* append it */
+		*tok = malloc(3);
+		if (*tok == NULL) {
+			free_token(token);
+			return TEP_EVENT_ERROR;
+		}
+		sprintf(*tok, "%c%c", *token, '~');
+		free_token(token);
+		/* Now remove the '~' from the buffer */
+		read_token(tep, &token);
+		free_token(token);
+	} else
+		*tok = token;
+
+	return type;
+}
+
+static int filter_cmp(const void *a, const void *b)
+{
+	const struct tep_filter_type *ea = a;
+	const struct tep_filter_type *eb = b;
+
+	if (ea->event_id < eb->event_id)
+		return -1;
+
+	if (ea->event_id > eb->event_id)
+		return 1;
+
+	return 0;
+}
+
+static struct tep_filter_type *
+find_filter_type(struct tep_event_filter *filter, int id)
+{
+	struct tep_filter_type *filter_type;
+	struct tep_filter_type key;
+
+	key.event_id = id;
+
+	filter_type = bsearch(&key, filter->event_filters,
+			      filter->filters,
+			      sizeof(*filter->event_filters),
+			      filter_cmp);
+
+	return filter_type;
+}
+
+static struct tep_filter_type *
+add_filter_type(struct tep_event_filter *filter, int id)
+{
+	struct tep_filter_type *filter_type;
+	int i;
+
+	filter_type = find_filter_type(filter, id);
+	if (filter_type)
+		return filter_type;
+
+	filter_type = realloc(filter->event_filters,
+			      sizeof(*filter->event_filters) *
+			      (filter->filters + 1));
+	if (!filter_type)
+		return NULL;
+
+	filter->event_filters = filter_type;
+
+	for (i = 0; i < filter->filters; i++) {
+		if (filter->event_filters[i].event_id > id)
+			break;
+	}
+
+	if (i < filter->filters)
+		memmove(&filter->event_filters[i+1],
+			&filter->event_filters[i],
+			sizeof(*filter->event_filters) *
+			(filter->filters - i));
+
+	filter_type = &filter->event_filters[i];
+	filter_type->event_id = id;
+	filter_type->event = tep_find_event(filter->tep, id);
+	filter_type->filter = NULL;
+
+	filter->filters++;
+
+	return filter_type;
+}
+
+/**
+ * tep_filter_alloc - create a new event filter
+ * @tep: The tep that this filter is associated with
+ */
+struct tep_event_filter *tep_filter_alloc(struct tep_handle *tep)
+{
+	struct tep_event_filter *filter;
+
+	filter = malloc(sizeof(*filter));
+	if (filter == NULL)
+		return NULL;
+
+	memset(filter, 0, sizeof(*filter));
+	filter->tep = tep;
+	tep_ref(tep);
+
+	return filter;
+}
+
+static struct tep_filter_arg *allocate_arg(void)
+{
+	return calloc(1, sizeof(struct tep_filter_arg));
+}
+
+static void free_arg(struct tep_filter_arg *arg)
+{
+	if (!arg)
+		return;
+
+	switch (arg->type) {
+	case TEP_FILTER_ARG_NONE:
+	case TEP_FILTER_ARG_BOOLEAN:
+		break;
+
+	case TEP_FILTER_ARG_NUM:
+		free_arg(arg->num.left);
+		free_arg(arg->num.right);
+		break;
+
+	case TEP_FILTER_ARG_EXP:
+		free_arg(arg->exp.left);
+		free_arg(arg->exp.right);
+		break;
+
+	case TEP_FILTER_ARG_STR:
+		free(arg->str.val);
+		regfree(&arg->str.reg);
+		free(arg->str.buffer);
+		break;
+
+	case TEP_FILTER_ARG_VALUE:
+		if (arg->value.type == TEP_FILTER_STRING ||
+		    arg->value.type == TEP_FILTER_CHAR)
+			free(arg->value.str);
+		break;
+
+	case TEP_FILTER_ARG_OP:
+		free_arg(arg->op.left);
+		free_arg(arg->op.right);
+	default:
+		break;
+	}
+
+	free(arg);
+}
+
+static int add_event(struct event_list **events,
+		     struct tep_event *event)
+{
+	struct event_list *list;
+
+	list = malloc(sizeof(*list));
+	if (list == NULL)
+		return -1;
+
+	list->next = *events;
+	*events = list;
+	list->event = event;
+	return 0;
+}
+
+static int event_match(struct tep_event *event,
+		       regex_t *sreg, regex_t *ereg)
+{
+	if (sreg) {
+		return !regexec(sreg, event->system, 0, NULL, 0) &&
+			!regexec(ereg, event->name, 0, NULL, 0);
+	}
+
+	return !regexec(ereg, event->system, 0, NULL, 0) ||
+		!regexec(ereg, event->name, 0, NULL, 0);
+}
+
+static enum tep_errno
+find_event(struct tep_handle *tep, struct event_list **events,
+	   char *sys_name, char *event_name)
+{
+	struct tep_event *event;
+	regex_t ereg;
+	regex_t sreg;
+	int match = 0;
+	int fail = 0;
+	char *reg;
+	int ret;
+	int i;
+
+	if (!event_name) {
+		/* if no name is given, then swap sys and name */
+		event_name = sys_name;
+		sys_name = NULL;
+	}
+
+	ret = asprintf(&reg, "^%s$", event_name);
+	if (ret < 0)
+		return TEP_ERRNO__MEM_ALLOC_FAILED;
+
+	ret = regcomp(&ereg, reg, REG_ICASE|REG_NOSUB);
+	free(reg);
+
+	if (ret)
+		return TEP_ERRNO__INVALID_EVENT_NAME;
+
+	if (sys_name) {
+		ret = asprintf(&reg, "^%s$", sys_name);
+		if (ret < 0) {
+			regfree(&ereg);
+			return TEP_ERRNO__MEM_ALLOC_FAILED;
+		}
+
+		ret = regcomp(&sreg, reg, REG_ICASE|REG_NOSUB);
+		free(reg);
+		if (ret) {
+			regfree(&ereg);
+			return TEP_ERRNO__INVALID_EVENT_NAME;
+		}
+	}
+
+	for (i = 0; i < tep->nr_events; i++) {
+		event = tep->events[i];
+		if (event_match(event, sys_name ? &sreg : NULL, &ereg)) {
+			match = 1;
+			if (add_event(events, event) < 0) {
+				fail = 1;
+				break;
+			}
+		}
+	}
+
+	regfree(&ereg);
+	if (sys_name)
+		regfree(&sreg);
+
+	if (!match)
+		return TEP_ERRNO__EVENT_NOT_FOUND;
+	if (fail)
+		return TEP_ERRNO__MEM_ALLOC_FAILED;
+
+	return 0;
+}
+
+static void free_events(struct event_list *events)
+{
+	struct event_list *event;
+
+	while (events) {
+		event = events;
+		events = events->next;
+		free(event);
+	}
+}
+
+static enum tep_errno
+create_arg_item(struct tep_event *event, const char *token,
+		enum tep_event_type type, struct tep_filter_arg **parg, char *error_str)
+{
+	struct tep_format_field *field;
+	struct tep_filter_arg *arg;
+
+	arg = allocate_arg();
+	if (arg == NULL) {
+		show_error(event->tep, error_str, "failed to allocate filter arg");
+		return TEP_ERRNO__MEM_ALLOC_FAILED;
+	}
+
+	switch (type) {
+
+	case TEP_EVENT_SQUOTE:
+	case TEP_EVENT_DQUOTE:
+		arg->type = TEP_FILTER_ARG_VALUE;
+		arg->value.type =
+			type == TEP_EVENT_DQUOTE ? TEP_FILTER_STRING : TEP_FILTER_CHAR;
+		arg->value.str = strdup(token);
+		if (!arg->value.str) {
+			free_arg(arg);
+			show_error(event->tep, error_str, "failed to allocate string filter arg");
+			return TEP_ERRNO__MEM_ALLOC_FAILED;
+		}
+		break;
+	case TEP_EVENT_ITEM:
+		/* if it is a number, then convert it */
+		if (isdigit(token[0])) {
+			arg->type = TEP_FILTER_ARG_VALUE;
+			arg->value.type = TEP_FILTER_NUMBER;
+			arg->value.val = strtoull(token, NULL, 0);
+			break;
+		}
+		/* Consider this a field */
+		field = tep_find_any_field(event, token);
+		if (!field) {
+			/* If token is 'COMM' or 'CPU' then it is special */
+			if (strcmp(token, COMM) == 0) {
+				field = &comm;
+			} else if (strcmp(token, CPU) == 0) {
+				field = &cpu;
+			} else {
+				/* not a field, Make it false */
+				arg->type = TEP_FILTER_ARG_BOOLEAN;
+				arg->boolean.value = TEP_FILTER_FALSE;
+				break;
+			}
+		}
+		arg->type = TEP_FILTER_ARG_FIELD;
+		arg->field.field = field;
+		break;
+	default:
+		free_arg(arg);
+		show_error(event->tep, error_str, "expected a value but found %s", token);
+		return TEP_ERRNO__UNEXPECTED_TYPE;
+	}
+	*parg = arg;
+	return 0;
+}
+
+static struct tep_filter_arg *
+create_arg_op(enum tep_filter_op_type btype)
+{
+	struct tep_filter_arg *arg;
+
+	arg = allocate_arg();
+	if (!arg)
+		return NULL;
+
+	arg->type = TEP_FILTER_ARG_OP;
+	arg->op.type = btype;
+
+	return arg;
+}
+
+static struct tep_filter_arg *
+create_arg_exp(enum tep_filter_exp_type etype)
+{
+	struct tep_filter_arg *arg;
+
+	arg = allocate_arg();
+	if (!arg)
+		return NULL;
+
+	arg->type = TEP_FILTER_ARG_EXP;
+	arg->exp.type = etype;
+
+	return arg;
+}
+
+static struct tep_filter_arg *
+create_arg_cmp(enum tep_filter_cmp_type ctype)
+{
+	struct tep_filter_arg *arg;
+
+	arg = allocate_arg();
+	if (!arg)
+		return NULL;
+
+	/* Use NUM and change if necessary */
+	arg->type = TEP_FILTER_ARG_NUM;
+	arg->num.type = ctype;
+
+	return arg;
+}
+
+static enum tep_errno
+add_right(struct tep_handle *tep, struct tep_filter_arg *op,
+		struct tep_filter_arg *arg, char *error_str)
+{
+	struct tep_filter_arg *left;
+	char *str;
+	int op_type;
+	int ret;
+
+	switch (op->type) {
+	case TEP_FILTER_ARG_EXP:
+		if (op->exp.right)
+			goto out_fail;
+		op->exp.right = arg;
+		break;
+
+	case TEP_FILTER_ARG_OP:
+		if (op->op.right)
+			goto out_fail;
+		op->op.right = arg;
+		break;
+
+	case TEP_FILTER_ARG_NUM:
+		if (op->op.right)
+			goto out_fail;
+		/*
+		 * The arg must be num, str, or field
+		 */
+		switch (arg->type) {
+		case TEP_FILTER_ARG_VALUE:
+		case TEP_FILTER_ARG_FIELD:
+			break;
+		default:
+			show_error(tep, error_str, "Illegal rvalue");
+			return TEP_ERRNO__ILLEGAL_RVALUE;
+		}
+
+		/*
+		 * Depending on the type, we may need to
+		 * convert this to a string or regex.
+		 */
+		switch (arg->value.type) {
+		case TEP_FILTER_CHAR:
+			/*
+			 * A char should be converted to number if
+			 * the string is 1 byte, and the compare
+			 * is not a REGEX.
+			 */
+			if (strlen(arg->value.str) == 1 &&
+			    op->num.type != TEP_FILTER_CMP_REGEX &&
+			    op->num.type != TEP_FILTER_CMP_NOT_REGEX) {
+				arg->value.type = TEP_FILTER_NUMBER;
+				goto do_int;
+			}
+			/* fall through */
+		case TEP_FILTER_STRING:
+
+			/* convert op to a string arg */
+			op_type = op->num.type;
+			left = op->num.left;
+			str = arg->value.str;
+
+			/* reset the op for the new field */
+			memset(op, 0, sizeof(*op));
+
+			/*
+			 * If left arg was a field not found then
+			 * NULL the entire op.
+			 */
+			if (left->type == TEP_FILTER_ARG_BOOLEAN) {
+				free_arg(left);
+				free_arg(arg);
+				op->type = TEP_FILTER_ARG_BOOLEAN;
+				op->boolean.value = TEP_FILTER_FALSE;
+				break;
+			}
+
+			/* Left arg must be a field */
+			if (left->type != TEP_FILTER_ARG_FIELD) {
+				show_error(tep, error_str,
+					   "Illegal lvalue for string comparison");
+				return TEP_ERRNO__ILLEGAL_LVALUE;
+			}
+
+			/* Make sure this is a valid string compare */
+			switch (op_type) {
+			case TEP_FILTER_CMP_EQ:
+				op_type = TEP_FILTER_CMP_MATCH;
+				break;
+			case TEP_FILTER_CMP_NE:
+				op_type = TEP_FILTER_CMP_NOT_MATCH;
+				break;
+
+			case TEP_FILTER_CMP_REGEX:
+			case TEP_FILTER_CMP_NOT_REGEX:
+				ret = regcomp(&op->str.reg, str, REG_ICASE|REG_NOSUB);
+				if (ret) {
+					show_error(tep, error_str,
+						   "RegEx '%s' did not compute",
+						   str);
+					return TEP_ERRNO__INVALID_REGEX;
+				}
+				break;
+			default:
+				show_error(tep, error_str,
+					   "Illegal comparison for string");
+				return TEP_ERRNO__ILLEGAL_STRING_CMP;
+			}
+
+			op->type = TEP_FILTER_ARG_STR;
+			op->str.type = op_type;
+			op->str.field = left->field.field;
+			op->str.val = strdup(str);
+			if (!op->str.val) {
+				show_error(tep, error_str, "Failed to allocate string filter");
+				return TEP_ERRNO__MEM_ALLOC_FAILED;
+			}
+			/*
+			 * Need a buffer to copy data for tests
+			 */
+			op->str.buffer = malloc(op->str.field->size + 1);
+			if (!op->str.buffer) {
+				show_error(tep, error_str, "Failed to allocate string filter");
+				return TEP_ERRNO__MEM_ALLOC_FAILED;
+			}
+			/* Null terminate this buffer */
+			op->str.buffer[op->str.field->size] = 0;
+
+			/* We no longer have left or right args */
+			free_arg(arg);
+			free_arg(left);
+
+			break;
+
+		case TEP_FILTER_NUMBER:
+
+ do_int:
+			switch (op->num.type) {
+			case TEP_FILTER_CMP_REGEX:
+			case TEP_FILTER_CMP_NOT_REGEX:
+				show_error(tep, error_str,
+					   "Op not allowed with integers");
+				return TEP_ERRNO__ILLEGAL_INTEGER_CMP;
+
+			default:
+				break;
+			}
+
+			/* numeric compare */
+			op->num.right = arg;
+			break;
+		default:
+			goto out_fail;
+		}
+		break;
+	default:
+		goto out_fail;
+	}
+
+	return 0;
+
+ out_fail:
+	show_error(tep, error_str, "Syntax error");
+	return TEP_ERRNO__SYNTAX_ERROR;
+}
+
+static struct tep_filter_arg *
+rotate_op_right(struct tep_filter_arg *a, struct tep_filter_arg *b)
+{
+	struct tep_filter_arg *arg;
+
+	arg = a->op.right;
+	a->op.right = b;
+	return arg;
+}
+
+static enum tep_errno add_left(struct tep_filter_arg *op, struct tep_filter_arg *arg)
+{
+	switch (op->type) {
+	case TEP_FILTER_ARG_EXP:
+		if (arg->type == TEP_FILTER_ARG_OP)
+			arg = rotate_op_right(arg, op);
+		op->exp.left = arg;
+		break;
+
+	case TEP_FILTER_ARG_OP:
+		op->op.left = arg;
+		break;
+	case TEP_FILTER_ARG_NUM:
+		if (arg->type == TEP_FILTER_ARG_OP)
+			arg = rotate_op_right(arg, op);
+
+		/* left arg of compares must be a field */
+		if (arg->type != TEP_FILTER_ARG_FIELD &&
+		    arg->type != TEP_FILTER_ARG_BOOLEAN)
+			return TEP_ERRNO__INVALID_ARG_TYPE;
+		op->num.left = arg;
+		break;
+	default:
+		return TEP_ERRNO__INVALID_ARG_TYPE;
+	}
+	return 0;
+}
+
+enum op_type {
+	OP_NONE,
+	OP_BOOL,
+	OP_NOT,
+	OP_EXP,
+	OP_CMP,
+};
+
+static enum op_type process_op(const char *token,
+			       enum tep_filter_op_type *btype,
+			       enum tep_filter_cmp_type *ctype,
+			       enum tep_filter_exp_type *etype)
+{
+	*btype = TEP_FILTER_OP_NOT;
+	*etype = TEP_FILTER_EXP_NONE;
+	*ctype = TEP_FILTER_CMP_NONE;
+
+	if (strcmp(token, "&&") == 0)
+		*btype = TEP_FILTER_OP_AND;
+	else if (strcmp(token, "||") == 0)
+		*btype = TEP_FILTER_OP_OR;
+	else if (strcmp(token, "!") == 0)
+		return OP_NOT;
+
+	if (*btype != TEP_FILTER_OP_NOT)
+		return OP_BOOL;
+
+	/* Check for value expressions */
+	if (strcmp(token, "+") == 0) {
+		*etype = TEP_FILTER_EXP_ADD;
+	} else if (strcmp(token, "-") == 0) {
+		*etype = TEP_FILTER_EXP_SUB;
+	} else if (strcmp(token, "*") == 0) {
+		*etype = TEP_FILTER_EXP_MUL;
+	} else if (strcmp(token, "/") == 0) {
+		*etype = TEP_FILTER_EXP_DIV;
+	} else if (strcmp(token, "%") == 0) {
+		*etype = TEP_FILTER_EXP_MOD;
+	} else if (strcmp(token, ">>") == 0) {
+		*etype = TEP_FILTER_EXP_RSHIFT;
+	} else if (strcmp(token, "<<") == 0) {
+		*etype = TEP_FILTER_EXP_LSHIFT;
+	} else if (strcmp(token, "&") == 0) {
+		*etype = TEP_FILTER_EXP_AND;
+	} else if (strcmp(token, "|") == 0) {
+		*etype = TEP_FILTER_EXP_OR;
+	} else if (strcmp(token, "^") == 0) {
+		*etype = TEP_FILTER_EXP_XOR;
+	} else if (strcmp(token, "~") == 0)
+		*etype = TEP_FILTER_EXP_NOT;
+
+	if (*etype != TEP_FILTER_EXP_NONE)
+		return OP_EXP;
+
+	/* Check for compares */
+	if (strcmp(token, "==") == 0)
+		*ctype = TEP_FILTER_CMP_EQ;
+	else if (strcmp(token, "!=") == 0)
+		*ctype = TEP_FILTER_CMP_NE;
+	else if (strcmp(token, "<") == 0)
+		*ctype = TEP_FILTER_CMP_LT;
+	else if (strcmp(token, ">") == 0)
+		*ctype = TEP_FILTER_CMP_GT;
+	else if (strcmp(token, "<=") == 0)
+		*ctype = TEP_FILTER_CMP_LE;
+	else if (strcmp(token, ">=") == 0)
+		*ctype = TEP_FILTER_CMP_GE;
+	else if (strcmp(token, "=~") == 0)
+		*ctype = TEP_FILTER_CMP_REGEX;
+	else if (strcmp(token, "!~") == 0)
+		*ctype = TEP_FILTER_CMP_NOT_REGEX;
+	else
+		return OP_NONE;
+
+	return OP_CMP;
+}
+
+static int check_op_done(struct tep_filter_arg *arg)
+{
+	switch (arg->type) {
+	case TEP_FILTER_ARG_EXP:
+		return arg->exp.right != NULL;
+
+	case TEP_FILTER_ARG_OP:
+		return arg->op.right != NULL;
+
+	case TEP_FILTER_ARG_NUM:
+		return arg->num.right != NULL;
+
+	case TEP_FILTER_ARG_STR:
+		/* A string conversion is always done */
+		return 1;
+
+	case TEP_FILTER_ARG_BOOLEAN:
+		/* field not found, is ok */
+		return 1;
+
+	default:
+		return 0;
+	}
+}
+
+enum filter_vals {
+	FILTER_VAL_NORM,
+	FILTER_VAL_FALSE,
+	FILTER_VAL_TRUE,
+};
+
+static enum tep_errno
+reparent_op_arg(struct tep_handle *tep, struct tep_filter_arg *parent,
+		struct tep_filter_arg *old_child, struct tep_filter_arg *arg,
+		char *error_str)
+{
+	struct tep_filter_arg *other_child;
+	struct tep_filter_arg **ptr;
+
+	if (parent->type != TEP_FILTER_ARG_OP &&
+	    arg->type != TEP_FILTER_ARG_OP) {
+		show_error(tep, error_str, "can not reparent other than OP");
+		return TEP_ERRNO__REPARENT_NOT_OP;
+	}
+
+	/* Get the sibling */
+	if (old_child->op.right == arg) {
+		ptr = &old_child->op.right;
+		other_child = old_child->op.left;
+	} else if (old_child->op.left == arg) {
+		ptr = &old_child->op.left;
+		other_child = old_child->op.right;
+	} else {
+		show_error(tep, error_str, "Error in reparent op, find other child");
+		return TEP_ERRNO__REPARENT_FAILED;
+	}
+
+	/* Detach arg from old_child */
+	*ptr = NULL;
+
+	/* Check for root */
+	if (parent == old_child) {
+		free_arg(other_child);
+		*parent = *arg;
+		/* Free arg without recussion */
+		free(arg);
+		return 0;
+	}
+
+	if (parent->op.right == old_child)
+		ptr = &parent->op.right;
+	else if (parent->op.left == old_child)
+		ptr = &parent->op.left;
+	else {
+		show_error(tep, error_str, "Error in reparent op");
+		return TEP_ERRNO__REPARENT_FAILED;
+	}
+
+	*ptr = arg;
+
+	free_arg(old_child);
+	return 0;
+}
+
+/* Returns either filter_vals (success) or tep_errno (failfure) */
+static int test_arg(struct tep_handle *tep, struct tep_filter_arg *parent,
+		struct tep_filter_arg *arg, char *error_str)
+{
+	int lval, rval;
+
+	switch (arg->type) {
+
+		/* bad case */
+	case TEP_FILTER_ARG_BOOLEAN:
+		return FILTER_VAL_FALSE + arg->boolean.value;
+
+		/* good cases: */
+	case TEP_FILTER_ARG_STR:
+	case TEP_FILTER_ARG_VALUE:
+	case TEP_FILTER_ARG_FIELD:
+		return FILTER_VAL_NORM;
+
+	case TEP_FILTER_ARG_EXP:
+		lval = test_arg(tep, arg, arg->exp.left, error_str);
+		if (lval != FILTER_VAL_NORM)
+			return lval;
+		rval = test_arg(tep, arg, arg->exp.right, error_str);
+		if (rval != FILTER_VAL_NORM)
+			return rval;
+		return FILTER_VAL_NORM;
+
+	case TEP_FILTER_ARG_NUM:
+		lval = test_arg(tep, arg, arg->num.left, error_str);
+		if (lval != FILTER_VAL_NORM)
+			return lval;
+		rval = test_arg(tep, arg, arg->num.right, error_str);
+		if (rval != FILTER_VAL_NORM)
+			return rval;
+		return FILTER_VAL_NORM;
+
+	case TEP_FILTER_ARG_OP:
+		if (arg->op.type != TEP_FILTER_OP_NOT) {
+			lval = test_arg(tep, arg, arg->op.left, error_str);
+			switch (lval) {
+			case FILTER_VAL_NORM:
+				break;
+			case FILTER_VAL_TRUE:
+				if (arg->op.type == TEP_FILTER_OP_OR)
+					return FILTER_VAL_TRUE;
+				rval = test_arg(tep, arg, arg->op.right, error_str);
+				if (rval != FILTER_VAL_NORM)
+					return rval;
+
+				return reparent_op_arg(tep, parent, arg, arg->op.right,
+						       error_str);
+
+			case FILTER_VAL_FALSE:
+				if (arg->op.type == TEP_FILTER_OP_AND)
+					return FILTER_VAL_FALSE;
+				rval = test_arg(tep, arg, arg->op.right, error_str);
+				if (rval != FILTER_VAL_NORM)
+					return rval;
+
+				return reparent_op_arg(tep, parent, arg, arg->op.right,
+						       error_str);
+
+			default:
+				return lval;
+			}
+		}
+
+		rval = test_arg(tep, arg, arg->op.right, error_str);
+		switch (rval) {
+		case FILTER_VAL_NORM:
+		default:
+			break;
+
+		case FILTER_VAL_TRUE:
+			if (arg->op.type == TEP_FILTER_OP_OR)
+				return FILTER_VAL_TRUE;
+			if (arg->op.type == TEP_FILTER_OP_NOT)
+				return FILTER_VAL_FALSE;
+
+			return reparent_op_arg(tep, parent, arg, arg->op.left,
+					       error_str);
+
+		case FILTER_VAL_FALSE:
+			if (arg->op.type == TEP_FILTER_OP_AND)
+				return FILTER_VAL_FALSE;
+			if (arg->op.type == TEP_FILTER_OP_NOT)
+				return FILTER_VAL_TRUE;
+
+			return reparent_op_arg(tep, parent, arg, arg->op.left,
+					       error_str);
+		}
+
+		return rval;
+	default:
+		show_error(tep, error_str, "bad arg in filter tree");
+		return TEP_ERRNO__BAD_FILTER_ARG;
+	}
+	return FILTER_VAL_NORM;
+}
+
+/* Remove any unknown event fields */
+static int collapse_tree(struct tep_handle *tep, struct tep_filter_arg *arg,
+			 struct tep_filter_arg **arg_collapsed, char *error_str)
+{
+	int ret;
+
+	ret = test_arg(tep, arg, arg, error_str);
+	switch (ret) {
+	case FILTER_VAL_NORM:
+		break;
+
+	case FILTER_VAL_TRUE:
+	case FILTER_VAL_FALSE:
+		free_arg(arg);
+		arg = allocate_arg();
+		if (arg) {
+			arg->type = TEP_FILTER_ARG_BOOLEAN;
+			arg->boolean.value = ret == FILTER_VAL_TRUE;
+		} else {
+			show_error(tep, error_str, "Failed to allocate filter arg");
+			ret = TEP_ERRNO__MEM_ALLOC_FAILED;
+		}
+		break;
+
+	default:
+		/* test_arg() already set the error_str */
+		free_arg(arg);
+		arg = NULL;
+		break;
+	}
+
+	*arg_collapsed = arg;
+	return ret;
+}
+
+static enum tep_errno
+process_filter(struct tep_event *event, struct tep_filter_arg **parg,
+	       char *error_str, int not)
+{
+	enum tep_event_type type;
+	char *token = NULL;
+	struct tep_filter_arg *current_op = NULL;
+	struct tep_filter_arg *current_exp = NULL;
+	struct tep_filter_arg *left_item = NULL;
+	struct tep_filter_arg *arg = NULL;
+	enum op_type op_type;
+	enum tep_filter_op_type btype;
+	enum tep_filter_exp_type etype;
+	enum tep_filter_cmp_type ctype;
+	enum tep_errno ret;
+
+	*parg = NULL;
+
+	do {
+		free(token);
+		type = filter_read_token(event->tep, &token);
+		switch (type) {
+		case TEP_EVENT_SQUOTE:
+		case TEP_EVENT_DQUOTE:
+		case TEP_EVENT_ITEM:
+			ret = create_arg_item(event, token, type, &arg, error_str);
+			if (ret < 0)
+				goto fail;
+			if (!left_item)
+				left_item = arg;
+			else if (current_exp) {
+				ret = add_right(event->tep, current_exp, arg, error_str);
+				if (ret < 0)
+					goto fail;
+				left_item = NULL;
+				/* Not's only one one expression */
+				if (not) {
+					arg = NULL;
+					if (current_op)
+						goto fail_syntax;
+					free(token);
+					*parg = current_exp;
+					return 0;
+				}
+			} else
+				goto fail_syntax;
+			arg = NULL;
+			break;
+
+		case TEP_EVENT_DELIM:
+			if (*token == ',') {
+				show_error(event->tep, error_str, "Illegal token ','");
+				ret = TEP_ERRNO__ILLEGAL_TOKEN;
+				goto fail;
+			}
+
+			if (*token == '(') {
+				if (left_item) {
+					show_error(event->tep, error_str,
+						   "Open paren can not come after item");
+					ret = TEP_ERRNO__INVALID_PAREN;
+					goto fail;
+				}
+				if (current_exp) {
+					show_error(event->tep, error_str,
+						   "Open paren can not come after expression");
+					ret = TEP_ERRNO__INVALID_PAREN;
+					goto fail;
+				}
+
+				ret = process_filter(event, &arg, error_str, 0);
+				if (ret != TEP_ERRNO__UNBALANCED_PAREN) {
+					if (ret == 0) {
+						show_error(event->tep, error_str,
+							   "Unbalanced number of '('");
+						ret = TEP_ERRNO__UNBALANCED_PAREN;
+					}
+					goto fail;
+				}
+				ret = 0;
+
+				/* A not wants just one expression */
+				if (not) {
+					if (current_op)
+						goto fail_syntax;
+					*parg = arg;
+					return 0;
+				}
+
+				if (current_op)
+					ret = add_right(event->tep, current_op, arg, error_str);
+				else
+					current_exp = arg;
+
+				if (ret < 0)
+					goto fail;
+
+			} else { /* ')' */
+				if (!current_op && !current_exp)
+					goto fail_syntax;
+
+				/* Make sure everything is finished at this level */
+				if (current_exp && !check_op_done(current_exp))
+					goto fail_syntax;
+				if (current_op && !check_op_done(current_op))
+					goto fail_syntax;
+
+				if (current_op)
+					*parg = current_op;
+				else
+					*parg = current_exp;
+				free(token);
+				return TEP_ERRNO__UNBALANCED_PAREN;
+			}
+			break;
+
+		case TEP_EVENT_OP:
+			op_type = process_op(token, &btype, &ctype, &etype);
+
+			/* All expect a left arg except for NOT */
+			switch (op_type) {
+			case OP_BOOL:
+				/* Logic ops need a left expression */
+				if (!current_exp && !current_op)
+					goto fail_syntax;
+				/* fall through */
+			case OP_NOT:
+				/* logic only processes ops and exp */
+				if (left_item)
+					goto fail_syntax;
+				break;
+			case OP_EXP:
+			case OP_CMP:
+				if (!left_item)
+					goto fail_syntax;
+				break;
+			case OP_NONE:
+				show_error(event->tep, error_str,
+					   "Unknown op token %s", token);
+				ret = TEP_ERRNO__UNKNOWN_TOKEN;
+				goto fail;
+			}
+
+			ret = 0;
+			switch (op_type) {
+			case OP_BOOL:
+				arg = create_arg_op(btype);
+				if (arg == NULL)
+					goto fail_alloc;
+				if (current_op)
+					ret = add_left(arg, current_op);
+				else
+					ret = add_left(arg, current_exp);
+				current_op = arg;
+				current_exp = NULL;
+				break;
+
+			case OP_NOT:
+				arg = create_arg_op(btype);
+				if (arg == NULL)
+					goto fail_alloc;
+				if (current_op)
+					ret = add_right(event->tep, current_op, arg, error_str);
+				if (ret < 0)
+					goto fail;
+				current_exp = arg;
+				ret = process_filter(event, &arg, error_str, 1);
+				if (ret < 0)
+					goto fail;
+				ret = add_right(event->tep, current_exp, arg, error_str);
+				if (ret < 0)
+					goto fail;
+				break;
+
+			case OP_EXP:
+			case OP_CMP:
+				if (op_type == OP_EXP)
+					arg = create_arg_exp(etype);
+				else
+					arg = create_arg_cmp(ctype);
+				if (arg == NULL)
+					goto fail_alloc;
+
+				if (current_op)
+					ret = add_right(event->tep,current_op, arg, error_str);
+				if (ret < 0)
+					goto fail;
+				ret = add_left(arg, left_item);
+				if (ret < 0) {
+					arg = NULL;
+					goto fail_syntax;
+				}
+				current_exp = arg;
+				break;
+			default:
+				break;
+			}
+			arg = NULL;
+			if (ret < 0)
+				goto fail_syntax;
+			break;
+		case TEP_EVENT_NONE:
+			break;
+		case TEP_EVENT_ERROR:
+			goto fail_alloc;
+		default:
+			goto fail_syntax;
+		}
+	} while (type != TEP_EVENT_NONE);
+
+	if (!current_op && !current_exp)
+		goto fail_syntax;
+
+	if (!current_op)
+		current_op = current_exp;
+
+	ret = collapse_tree(event->tep, current_op, parg, error_str);
+	/* collapse_tree() may free current_op, and updates parg accordingly */
+	current_op = NULL;
+	if (ret < 0)
+		goto fail;
+
+	free(token);
+	return 0;
+
+ fail_alloc:
+	show_error(event->tep, error_str, "failed to allocate filter arg");
+	ret = TEP_ERRNO__MEM_ALLOC_FAILED;
+	goto fail;
+ fail_syntax:
+	show_error(event->tep, error_str, "Syntax error");
+	ret = TEP_ERRNO__SYNTAX_ERROR;
+ fail:
+	free_arg(current_op);
+	free_arg(current_exp);
+	free_arg(arg);
+	free(token);
+	return ret;
+}
+
+static enum tep_errno
+process_event(struct tep_event *event, const char *filter_str,
+	      struct tep_filter_arg **parg, char *error_str)
+{
+	int ret;
+
+	init_input_buf(event->tep, filter_str, strlen(filter_str));
+
+	ret = process_filter(event, parg, error_str, 0);
+	if (ret < 0)
+		return ret;
+
+	/* If parg is NULL, then make it into FALSE */
+	if (!*parg) {
+		*parg = allocate_arg();
+		if (*parg == NULL)
+			return TEP_ERRNO__MEM_ALLOC_FAILED;
+
+		(*parg)->type = TEP_FILTER_ARG_BOOLEAN;
+		(*parg)->boolean.value = TEP_FILTER_FALSE;
+	}
+
+	return 0;
+}
+
+static enum tep_errno
+filter_event(struct tep_event_filter *filter, struct tep_event *event,
+	     const char *filter_str, char *error_str)
+{
+	struct tep_filter_type *filter_type;
+	struct tep_filter_arg *arg;
+	enum tep_errno ret;
+
+	if (filter_str) {
+		ret = process_event(event, filter_str, &arg, error_str);
+		if (ret < 0)
+			return ret;
+
+	} else {
+		/* just add a TRUE arg */
+		arg = allocate_arg();
+		if (arg == NULL)
+			return TEP_ERRNO__MEM_ALLOC_FAILED;
+
+		arg->type = TEP_FILTER_ARG_BOOLEAN;
+		arg->boolean.value = TEP_FILTER_TRUE;
+	}
+
+	filter_type = add_filter_type(filter, event->id);
+	if (filter_type == NULL) {
+		free_arg(arg);
+		return TEP_ERRNO__MEM_ALLOC_FAILED;
+	}
+
+	if (filter_type->filter)
+		free_arg(filter_type->filter);
+	filter_type->filter = arg;
+
+	return 0;
+}
+
+static void filter_init_error_buf(struct tep_event_filter *filter)
+{
+	/* clear buffer to reset show error */
+	init_input_buf(filter->tep, "", 0);
+	filter->error_buffer[0] = '\0';
+}
+
+/**
+ * tep_filter_add_filter_str - add a new filter
+ * @filter: the event filter to add to
+ * @filter_str: the filter string that contains the filter
+ *
+ * Returns 0 if the filter was successfully added or a
+ * negative error code.  Use tep_filter_strerror() to see
+ * actual error message in case of error.
+ */
+enum tep_errno tep_filter_add_filter_str(struct tep_event_filter *filter,
+					 const char *filter_str)
+{
+	struct tep_handle *tep = filter->tep;
+	struct event_list *event;
+	struct event_list *events = NULL;
+	const char *filter_start;
+	const char *next_event;
+	char *this_event;
+	char *event_name = NULL;
+	char *sys_name = NULL;
+	char *sp;
+	enum tep_errno rtn = 0; /* TEP_ERRNO__SUCCESS */
+	int len;
+	int ret;
+
+	filter_init_error_buf(filter);
+
+	filter_start = strchr(filter_str, ':');
+	if (filter_start)
+		len = filter_start - filter_str;
+	else
+		len = strlen(filter_str);
+
+	do {
+		next_event = strchr(filter_str, ',');
+		if (next_event &&
+		    (!filter_start || next_event < filter_start))
+			len = next_event - filter_str;
+		else if (filter_start)
+			len = filter_start - filter_str;
+		else
+			len = strlen(filter_str);
+
+		this_event = malloc(len + 1);
+		if (this_event == NULL) {
+			/* This can only happen when events is NULL, but still */
+			free_events(events);
+			return TEP_ERRNO__MEM_ALLOC_FAILED;
+		}
+		memcpy(this_event, filter_str, len);
+		this_event[len] = 0;
+
+		if (next_event)
+			next_event++;
+
+		filter_str = next_event;
+
+		sys_name = strtok_r(this_event, "/", &sp);
+		event_name = strtok_r(NULL, "/", &sp);
+
+		if (!sys_name) {
+			/* This can only happen when events is NULL, but still */
+			free_events(events);
+			free(this_event);
+			return TEP_ERRNO__FILTER_NOT_FOUND;
+		}
+
+		/* Find this event */
+		ret = find_event(tep, &events, strim(sys_name), strim(event_name));
+		if (ret < 0) {
+			free_events(events);
+			free(this_event);
+			return ret;
+		}
+		free(this_event);
+	} while (filter_str);
+
+	/* Skip the ':' */
+	if (filter_start)
+		filter_start++;
+
+	/* filter starts here */
+	for (event = events; event; event = event->next) {
+		ret = filter_event(filter, event->event, filter_start,
+				   filter->error_buffer);
+		/* Failures are returned if a parse error happened */
+		if (ret < 0)
+			rtn = ret;
+
+		if (ret >= 0 && tep->test_filters) {
+			char *test;
+			test = tep_filter_make_string(filter, event->event->id);
+			if (test) {
+				printf(" '%s: %s'\n", event->event->name, test);
+				free(test);
+			}
+		}
+	}
+
+	free_events(events);
+
+	return rtn;
+}
+
+static void free_filter_type(struct tep_filter_type *filter_type)
+{
+	free_arg(filter_type->filter);
+}
+
+/**
+ * tep_filter_strerror - fill error message in a buffer
+ * @filter: the event filter contains error
+ * @err: the error code
+ * @buf: the buffer to be filled in
+ * @buflen: the size of the buffer
+ *
+ * Returns 0 if message was filled successfully, -1 if error
+ */
+int tep_filter_strerror(struct tep_event_filter *filter, enum tep_errno err,
+			char *buf, size_t buflen)
+{
+	if (err <= __TEP_ERRNO__START || err >= __TEP_ERRNO__END)
+		return -1;
+
+	if (strlen(filter->error_buffer) > 0) {
+		size_t len = snprintf(buf, buflen, "%s", filter->error_buffer);
+
+		if (len > buflen)
+			return -1;
+		return 0;
+	}
+
+	return tep_strerror(filter->tep, err, buf, buflen);
+}
+
+/**
+ * tep_filter_remove_event - remove a filter for an event
+ * @filter: the event filter to remove from
+ * @event_id: the event to remove a filter for
+ *
+ * Removes the filter saved for an event defined by @event_id
+ * from the @filter.
+ *
+ * Returns 1: if an event was removed
+ *   0: if the event was not found
+ */
+int tep_filter_remove_event(struct tep_event_filter *filter,
+			    int event_id)
+{
+	struct tep_filter_type *filter_type;
+	unsigned long len;
+
+	if (!filter->filters)
+		return 0;
+
+	filter_type = find_filter_type(filter, event_id);
+
+	if (!filter_type)
+		return 0;
+
+	free_filter_type(filter_type);
+
+	/* The filter_type points into the event_filters array */
+	len = (unsigned long)(filter->event_filters + filter->filters) -
+		(unsigned long)(filter_type + 1);
+
+	memmove(filter_type, filter_type + 1, len);
+	filter->filters--;
+
+	memset(&filter->event_filters[filter->filters], 0,
+	       sizeof(*filter_type));
+
+	return 1;
+}
+
+/**
+ * tep_filter_reset - clear all filters in a filter
+ * @filter: the event filter to reset
+ *
+ * Removes all filters from a filter and resets it.
+ */
+void tep_filter_reset(struct tep_event_filter *filter)
+{
+	int i;
+
+	for (i = 0; i < filter->filters; i++)
+		free_filter_type(&filter->event_filters[i]);
+
+	free(filter->event_filters);
+	filter->filters = 0;
+	filter->event_filters = NULL;
+}
+
+void tep_filter_free(struct tep_event_filter *filter)
+{
+	tep_unref(filter->tep);
+
+	tep_filter_reset(filter);
+
+	free(filter);
+}
+
+static char *arg_to_str(struct tep_event_filter *filter, struct tep_filter_arg *arg);
+
+static int copy_filter_type(struct tep_event_filter *filter,
+			    struct tep_event_filter *source,
+			    struct tep_filter_type *filter_type)
+{
+	struct tep_filter_arg *arg;
+	struct tep_event *event;
+	const char *sys;
+	const char *name;
+	char *str;
+
+	/* Can't assume that the tep's are the same */
+	sys = filter_type->event->system;
+	name = filter_type->event->name;
+	event = tep_find_event_by_name(filter->tep, sys, name);
+	if (!event)
+		return -1;
+
+	str = arg_to_str(source, filter_type->filter);
+	if (!str)
+		return -1;
+
+	if (strcmp(str, "TRUE") == 0 || strcmp(str, "FALSE") == 0) {
+		/* Add trivial event */
+		arg = allocate_arg();
+		if (arg == NULL) {
+			free(str);
+			return -1;
+		}
+
+		arg->type = TEP_FILTER_ARG_BOOLEAN;
+		if (strcmp(str, "TRUE") == 0)
+			arg->boolean.value = 1;
+		else
+			arg->boolean.value = 0;
+
+		filter_type = add_filter_type(filter, event->id);
+		if (filter_type == NULL) {
+			free(str);
+			free_arg(arg);
+			return -1;
+		}
+
+		filter_type->filter = arg;
+
+		free(str);
+		return 0;
+	}
+
+	filter_event(filter, event, str, NULL);
+	free(str);
+
+	return 0;
+}
+
+/**
+ * tep_filter_copy - copy a filter using another filter
+ * @dest - the filter to copy to
+ * @source - the filter to copy from
+ *
+ * Returns 0 on success and -1 if not all filters were copied
+ */
+int tep_filter_copy(struct tep_event_filter *dest, struct tep_event_filter *source)
+{
+	int ret = 0;
+	int i;
+
+	tep_filter_reset(dest);
+
+	for (i = 0; i < source->filters; i++) {
+		if (copy_filter_type(dest, source, &source->event_filters[i]))
+			ret = -1;
+	}
+	return ret;
+}
+
+static int test_filter(struct tep_event *event, struct tep_filter_arg *arg,
+		       struct tep_record *record, enum tep_errno *err);
+
+static const char *
+get_comm(struct tep_event *event, struct tep_record *record)
+{
+	const char *comm;
+	int pid;
+
+	pid = tep_data_pid(event->tep, record);
+	comm = tep_data_comm_from_pid(event->tep, pid);
+	return comm;
+}
+
+static unsigned long long
+get_value(struct tep_event *event,
+	  struct tep_format_field *field, struct tep_record *record)
+{
+	unsigned long long val;
+
+	/* Handle our dummy "comm" field */
+	if (field == &comm) {
+		const char *name;
+
+		name = get_comm(event, record);
+		return (unsigned long)name;
+	}
+
+	/* Handle our dummy "cpu" field */
+	if (field == &cpu)
+		return record->cpu;
+
+	tep_read_number_field(field, record->data, &val);
+
+	if (!(field->flags & TEP_FIELD_IS_SIGNED))
+		return val;
+
+	switch (field->size) {
+	case 1:
+		return (char)val;
+	case 2:
+		return (short)val;
+	case 4:
+		return (int)val;
+	case 8:
+		return (long long)val;
+	}
+	return val;
+}
+
+static unsigned long long
+get_arg_value(struct tep_event *event, struct tep_filter_arg *arg,
+	      struct tep_record *record, enum tep_errno *err);
+
+static unsigned long long
+get_exp_value(struct tep_event *event, struct tep_filter_arg *arg,
+	      struct tep_record *record, enum tep_errno *err)
+{
+	unsigned long long lval, rval;
+
+	lval = get_arg_value(event, arg->exp.left, record, err);
+	rval = get_arg_value(event, arg->exp.right, record, err);
+
+	if (*err) {
+		/*
+		 * There was an error, no need to process anymore.
+		 */
+		return 0;
+	}
+
+	switch (arg->exp.type) {
+	case TEP_FILTER_EXP_ADD:
+		return lval + rval;
+
+	case TEP_FILTER_EXP_SUB:
+		return lval - rval;
+
+	case TEP_FILTER_EXP_MUL:
+		return lval * rval;
+
+	case TEP_FILTER_EXP_DIV:
+		return lval / rval;
+
+	case TEP_FILTER_EXP_MOD:
+		return lval % rval;
+
+	case TEP_FILTER_EXP_RSHIFT:
+		return lval >> rval;
+
+	case TEP_FILTER_EXP_LSHIFT:
+		return lval << rval;
+
+	case TEP_FILTER_EXP_AND:
+		return lval & rval;
+
+	case TEP_FILTER_EXP_OR:
+		return lval | rval;
+
+	case TEP_FILTER_EXP_XOR:
+		return lval ^ rval;
+
+	case TEP_FILTER_EXP_NOT:
+	default:
+		if (!*err)
+			*err = TEP_ERRNO__INVALID_EXP_TYPE;
+	}
+	return 0;
+}
+
+static unsigned long long
+get_arg_value(struct tep_event *event, struct tep_filter_arg *arg,
+	      struct tep_record *record, enum tep_errno *err)
+{
+	switch (arg->type) {
+	case TEP_FILTER_ARG_FIELD:
+		return get_value(event, arg->field.field, record);
+
+	case TEP_FILTER_ARG_VALUE:
+		if (arg->value.type != TEP_FILTER_NUMBER) {
+			if (!*err)
+				*err = TEP_ERRNO__NOT_A_NUMBER;
+		}
+		return arg->value.val;
+
+	case TEP_FILTER_ARG_EXP:
+		return get_exp_value(event, arg, record, err);
+
+	default:
+		if (!*err)
+			*err = TEP_ERRNO__INVALID_ARG_TYPE;
+	}
+	return 0;
+}
+
+static int test_num(struct tep_event *event, struct tep_filter_arg *arg,
+		    struct tep_record *record, enum tep_errno *err)
+{
+	unsigned long long lval, rval;
+
+	lval = get_arg_value(event, arg->num.left, record, err);
+	rval = get_arg_value(event, arg->num.right, record, err);
+
+	if (*err) {
+		/*
+		 * There was an error, no need to process anymore.
+		 */
+		return 0;
+	}
+
+	switch (arg->num.type) {
+	case TEP_FILTER_CMP_EQ:
+		return lval == rval;
+
+	case TEP_FILTER_CMP_NE:
+		return lval != rval;
+
+	case TEP_FILTER_CMP_GT:
+		return lval > rval;
+
+	case TEP_FILTER_CMP_LT:
+		return lval < rval;
+
+	case TEP_FILTER_CMP_GE:
+		return lval >= rval;
+
+	case TEP_FILTER_CMP_LE:
+		return lval <= rval;
+
+	default:
+		if (!*err)
+			*err = TEP_ERRNO__ILLEGAL_INTEGER_CMP;
+		return 0;
+	}
+}
+
+static const char *get_field_str(struct tep_filter_arg *arg, struct tep_record *record)
+{
+	struct tep_event *event;
+	struct tep_handle *tep;
+	unsigned long long addr;
+	const char *val = NULL;
+	unsigned int size;
+	char hex[64];
+
+	/* If the field is not a string convert it */
+	if (arg->str.field->flags & TEP_FIELD_IS_STRING) {
+		val = record->data + arg->str.field->offset;
+		size = arg->str.field->size;
+
+		if (arg->str.field->flags & TEP_FIELD_IS_DYNAMIC) {
+			addr = *(unsigned int *)val;
+			size = addr >> 16;
+			addr &= 0xffff;
+			if (arg->str.field->flags & TEP_FIELD_IS_RELATIVE)
+				addr += arg->str.field->offset + arg->str.field->size;
+			val = record->data + addr;
+		}
+
+		/*
+		 * We need to copy the data since we can't be sure the field
+		 * is null terminated.
+		 */
+		if (*(val + size - 1)) {
+			/* copy it */
+			memcpy(arg->str.buffer, val, arg->str.field->size);
+			/* the buffer is already NULL terminated */
+			val = arg->str.buffer;
+		}
+
+	} else {
+		event = arg->str.field->event;
+		tep = event->tep;
+		addr = get_value(event, arg->str.field, record);
+
+		if (arg->str.field->flags & (TEP_FIELD_IS_POINTER | TEP_FIELD_IS_LONG))
+			/* convert to a kernel symbol */
+			val = tep_find_function(tep, addr);
+
+		if (val == NULL) {
+			/* just use the hex of the string name */
+			snprintf(hex, 64, "0x%llx", addr);
+			val = hex;
+		}
+	}
+
+	return val;
+}
+
+static int test_str(struct tep_event *event, struct tep_filter_arg *arg,
+		    struct tep_record *record, enum tep_errno *err)
+{
+	const char *val;
+
+	if (arg->str.field == &comm)
+		val = get_comm(event, record);
+	else
+		val = get_field_str(arg, record);
+
+	switch (arg->str.type) {
+	case TEP_FILTER_CMP_MATCH:
+		return strcmp(val, arg->str.val) == 0;
+
+	case TEP_FILTER_CMP_NOT_MATCH:
+		return strcmp(val, arg->str.val) != 0;
+
+	case TEP_FILTER_CMP_REGEX:
+		/* Returns zero on match */
+		return !regexec(&arg->str.reg, val, 0, NULL, 0);
+
+	case TEP_FILTER_CMP_NOT_REGEX:
+		return regexec(&arg->str.reg, val, 0, NULL, 0);
+
+	default:
+		if (!*err)
+			*err = TEP_ERRNO__ILLEGAL_STRING_CMP;
+		return 0;
+	}
+}
+
+static int test_op(struct tep_event *event, struct tep_filter_arg *arg,
+		   struct tep_record *record, enum tep_errno *err)
+{
+	switch (arg->op.type) {
+	case TEP_FILTER_OP_AND:
+		return test_filter(event, arg->op.left, record, err) &&
+			test_filter(event, arg->op.right, record, err);
+
+	case TEP_FILTER_OP_OR:
+		return test_filter(event, arg->op.left, record, err) ||
+			test_filter(event, arg->op.right, record, err);
+
+	case TEP_FILTER_OP_NOT:
+		return !test_filter(event, arg->op.right, record, err);
+
+	default:
+		if (!*err)
+			*err = TEP_ERRNO__INVALID_OP_TYPE;
+		return 0;
+	}
+}
+
+static int test_filter(struct tep_event *event, struct tep_filter_arg *arg,
+		       struct tep_record *record, enum tep_errno *err)
+{
+	if (*err) {
+		/*
+		 * There was an error, no need to process anymore.
+		 */
+		return 0;
+	}
+
+	switch (arg->type) {
+	case TEP_FILTER_ARG_BOOLEAN:
+		/* easy case */
+		return arg->boolean.value;
+
+	case TEP_FILTER_ARG_OP:
+		return test_op(event, arg, record, err);
+
+	case TEP_FILTER_ARG_NUM:
+		return test_num(event, arg, record, err);
+
+	case TEP_FILTER_ARG_STR:
+		return test_str(event, arg, record, err);
+
+	case TEP_FILTER_ARG_EXP:
+	case TEP_FILTER_ARG_VALUE:
+	case TEP_FILTER_ARG_FIELD:
+		/*
+		 * Expressions, fields and values evaluate
+		 * to true if they return non zero
+		 */
+		return !!get_arg_value(event, arg, record, err);
+
+	default:
+		if (!*err)
+			*err = TEP_ERRNO__INVALID_ARG_TYPE;
+		return 0;
+	}
+}
+
+/**
+ * tep_event_filtered - return true if event has filter
+ * @filter: filter struct with filter information
+ * @event_id: event id to test if filter exists
+ *
+ * Returns 1 if filter found for @event_id
+ *   otherwise 0;
+ */
+int tep_event_filtered(struct tep_event_filter *filter, int event_id)
+{
+	struct tep_filter_type *filter_type;
+
+	if (!filter->filters)
+		return 0;
+
+	filter_type = find_filter_type(filter, event_id);
+
+	return filter_type ? 1 : 0;
+}
+
+/**
+ * tep_filter_match - test if a record matches a filter
+ * @filter: filter struct with filter information
+ * @record: the record to test against the filter
+ *
+ * Returns: match result or error code (prefixed with TEP_ERRNO__)
+ * FILTER_MATCH - filter found for event and @record matches
+ * FILTER_MISS  - filter found for event and @record does not match
+ * FILTER_NOT_FOUND - no filter found for @record's event
+ * NO_FILTER - if no filters exist
+ * otherwise - error occurred during test
+ */
+enum tep_errno tep_filter_match(struct tep_event_filter *filter,
+				struct tep_record *record)
+{
+	struct tep_handle *tep = filter->tep;
+	struct tep_filter_type *filter_type;
+	int event_id;
+	int ret;
+	enum tep_errno err = 0;
+
+	filter_init_error_buf(filter);
+
+	if (!filter->filters)
+		return TEP_ERRNO__NO_FILTER;
+
+	event_id = tep_data_type(tep, record);
+
+	filter_type = find_filter_type(filter, event_id);
+	if (!filter_type)
+		return TEP_ERRNO__FILTER_NOT_FOUND;
+
+	ret = test_filter(filter_type->event, filter_type->filter, record, &err);
+	if (err)
+		return err;
+
+	return ret ? TEP_ERRNO__FILTER_MATCH : TEP_ERRNO__FILTER_MISS;
+}
+
+static char *op_to_str(struct tep_event_filter *filter, struct tep_filter_arg *arg)
+{
+	char *str = NULL;
+	char *left = NULL;
+	char *right = NULL;
+	char *op = NULL;
+	int left_val = -1;
+	int right_val = -1;
+	int val;
+
+	switch (arg->op.type) {
+	case TEP_FILTER_OP_AND:
+		op = "&&";
+		/* fall through */
+	case TEP_FILTER_OP_OR:
+		if (!op)
+			op = "||";
+
+		left = arg_to_str(filter, arg->op.left);
+		right = arg_to_str(filter, arg->op.right);
+		if (!left || !right)
+			break;
+
+		/* Try to consolidate boolean values */
+		if (strcmp(left, "TRUE") == 0)
+			left_val = 1;
+		else if (strcmp(left, "FALSE") == 0)
+			left_val = 0;
+
+		if (strcmp(right, "TRUE") == 0)
+			right_val = 1;
+		else if (strcmp(right, "FALSE") == 0)
+			right_val = 0;
+
+		if (left_val >= 0) {
+			if ((arg->op.type == TEP_FILTER_OP_AND && !left_val) ||
+			    (arg->op.type == TEP_FILTER_OP_OR && left_val)) {
+				/* Just return left value */
+				str = left;
+				left = NULL;
+				break;
+			}
+			if (right_val >= 0) {
+				/* just evaluate this. */
+				val = 0;
+				switch (arg->op.type) {
+				case TEP_FILTER_OP_AND:
+					val = left_val && right_val;
+					break;
+				case TEP_FILTER_OP_OR:
+					val = left_val || right_val;
+					break;
+				default:
+					break;
+				}
+				if (asprintf(&str, val ? "TRUE" : "FALSE") < 0)
+					str = NULL;
+				break;
+			}
+		}
+		if (right_val >= 0) {
+			if ((arg->op.type == TEP_FILTER_OP_AND && !right_val) ||
+			    (arg->op.type == TEP_FILTER_OP_OR && right_val)) {
+				/* Just return right value */
+				str = right;
+				right = NULL;
+				break;
+			}
+			/* The right value is meaningless */
+			str = left;
+			left = NULL;
+			break;
+		}
+
+		if (asprintf(&str, "(%s) %s (%s)", left, op, right) < 0)
+			str = NULL;
+		break;
+
+	case TEP_FILTER_OP_NOT:
+		op = "!";
+		right = arg_to_str(filter, arg->op.right);
+		if (!right)
+			break;
+
+		/* See if we can consolidate */
+		if (strcmp(right, "TRUE") == 0)
+			right_val = 1;
+		else if (strcmp(right, "FALSE") == 0)
+			right_val = 0;
+		if (right_val >= 0) {
+			/* just return the opposite */
+			if (asprintf(&str, right_val ? "FALSE" : "TRUE") < 0)
+				str = NULL;
+			break;
+		}
+		if (asprintf(&str, "%s(%s)", op, right) < 0)
+			str = NULL;
+		break;
+
+	default:
+		/* ?? */
+		break;
+	}
+	free(left);
+	free(right);
+	return str;
+}
+
+static char *val_to_str(struct tep_event_filter *filter, struct tep_filter_arg *arg)
+{
+	char *str = NULL;
+
+	if (asprintf(&str, "%lld", arg->value.val) < 0)
+		str = NULL;
+
+	return str;
+}
+
+static char *field_to_str(struct tep_event_filter *filter, struct tep_filter_arg *arg)
+{
+	return strdup(arg->field.field->name);
+}
+
+static char *exp_to_str(struct tep_event_filter *filter, struct tep_filter_arg *arg)
+{
+	char *lstr;
+	char *rstr;
+	char *op;
+	char *str = NULL;
+
+	lstr = arg_to_str(filter, arg->exp.left);
+	rstr = arg_to_str(filter, arg->exp.right);
+	if (!lstr || !rstr)
+		goto out;
+
+	switch (arg->exp.type) {
+	case TEP_FILTER_EXP_ADD:
+		op = "+";
+		break;
+	case TEP_FILTER_EXP_SUB:
+		op = "-";
+		break;
+	case TEP_FILTER_EXP_MUL:
+		op = "*";
+		break;
+	case TEP_FILTER_EXP_DIV:
+		op = "/";
+		break;
+	case TEP_FILTER_EXP_MOD:
+		op = "%";
+		break;
+	case TEP_FILTER_EXP_RSHIFT:
+		op = ">>";
+		break;
+	case TEP_FILTER_EXP_LSHIFT:
+		op = "<<";
+		break;
+	case TEP_FILTER_EXP_AND:
+		op = "&";
+		break;
+	case TEP_FILTER_EXP_OR:
+		op = "|";
+		break;
+	case TEP_FILTER_EXP_XOR:
+		op = "^";
+		break;
+	default:
+		op = "[ERROR IN EXPRESSION TYPE]";
+		break;
+	}
+
+	if (asprintf(&str, "%s %s %s", lstr, op, rstr) < 0)
+		str = NULL;
+out:
+	free(lstr);
+	free(rstr);
+
+	return str;
+}
+
+static char *num_to_str(struct tep_event_filter *filter, struct tep_filter_arg *arg)
+{
+	char *lstr;
+	char *rstr;
+	char *str = NULL;
+	char *op = NULL;
+
+	lstr = arg_to_str(filter, arg->num.left);
+	rstr = arg_to_str(filter, arg->num.right);
+	if (!lstr || !rstr)
+		goto out;
+
+	switch (arg->num.type) {
+	case TEP_FILTER_CMP_EQ:
+		op = "==";
+		/* fall through */
+	case TEP_FILTER_CMP_NE:
+		if (!op)
+			op = "!=";
+		/* fall through */
+	case TEP_FILTER_CMP_GT:
+		if (!op)
+			op = ">";
+		/* fall through */
+	case TEP_FILTER_CMP_LT:
+		if (!op)
+			op = "<";
+		/* fall through */
+	case TEP_FILTER_CMP_GE:
+		if (!op)
+			op = ">=";
+		/* fall through */
+	case TEP_FILTER_CMP_LE:
+		if (!op)
+			op = "<=";
+
+		if (asprintf(&str, "%s %s %s", lstr, op, rstr) < 0)
+			str = NULL;
+		break;
+
+	default:
+		/* ?? */
+		break;
+	}
+
+out:
+	free(lstr);
+	free(rstr);
+	return str;
+}
+
+static char *str_to_str(struct tep_event_filter *filter, struct tep_filter_arg *arg)
+{
+	char *str = NULL;
+	char *op = NULL;
+
+	switch (arg->str.type) {
+	case TEP_FILTER_CMP_MATCH:
+		op = "==";
+		/* fall through */
+	case TEP_FILTER_CMP_NOT_MATCH:
+		if (!op)
+			op = "!=";
+		/* fall through */
+	case TEP_FILTER_CMP_REGEX:
+		if (!op)
+			op = "=~";
+		/* fall through */
+	case TEP_FILTER_CMP_NOT_REGEX:
+		if (!op)
+			op = "!~";
+
+		if (asprintf(&str, "%s %s \"%s\"",
+			 arg->str.field->name, op, arg->str.val) < 0)
+			str = NULL;
+		break;
+
+	default:
+		/* ?? */
+		break;
+	}
+	return str;
+}
+
+static char *arg_to_str(struct tep_event_filter *filter, struct tep_filter_arg *arg)
+{
+	char *str = NULL;
+
+	switch (arg->type) {
+	case TEP_FILTER_ARG_BOOLEAN:
+		if (asprintf(&str, arg->boolean.value ? "TRUE" : "FALSE") < 0)
+			str = NULL;
+		return str;
+
+	case TEP_FILTER_ARG_OP:
+		return op_to_str(filter, arg);
+
+	case TEP_FILTER_ARG_NUM:
+		return num_to_str(filter, arg);
+
+	case TEP_FILTER_ARG_STR:
+		return str_to_str(filter, arg);
+
+	case TEP_FILTER_ARG_VALUE:
+		return val_to_str(filter, arg);
+
+	case TEP_FILTER_ARG_FIELD:
+		return field_to_str(filter, arg);
+
+	case TEP_FILTER_ARG_EXP:
+		return exp_to_str(filter, arg);
+
+	default:
+		/* ?? */
+		return NULL;
+	}
+
+}
+
+/**
+ * tep_filter_make_string - return a string showing the filter
+ * @filter: filter struct with filter information
+ * @event_id: the event id to return the filter string with
+ *
+ * Returns a string that displays the filter contents.
+ *  This string must be freed with free(str).
+ *  NULL is returned if no filter is found or allocation failed.
+ */
+char *
+tep_filter_make_string(struct tep_event_filter *filter, int event_id)
+{
+	struct tep_filter_type *filter_type;
+
+	if (!filter->filters)
+		return NULL;
+
+	filter_type = find_filter_type(filter, event_id);
+
+	if (!filter_type)
+		return NULL;
+
+	return arg_to_str(filter, filter_type->filter);
+}
+
+/**
+ * tep_filter_compare - compare two filters and return if they are the same
+ * @filter1: Filter to compare with @filter2
+ * @filter2: Filter to compare with @filter1
+ *
+ * Returns:
+ *  1 if the two filters hold the same content.
+ *  0 if they do not.
+ */
+int tep_filter_compare(struct tep_event_filter *filter1, struct tep_event_filter *filter2)
+{
+	struct tep_filter_type *filter_type1;
+	struct tep_filter_type *filter_type2;
+	char *str1, *str2;
+	int result;
+	int i;
+
+	/* Do the easy checks first */
+	if (filter1->filters != filter2->filters)
+		return 0;
+	if (!filter1->filters && !filter2->filters)
+		return 1;
+
+	/*
+	 * Now take a look at each of the events to see if they have the same
+	 * filters to them.
+	 */
+	for (i = 0; i < filter1->filters; i++) {
+		filter_type1 = &filter1->event_filters[i];
+		filter_type2 = find_filter_type(filter2, filter_type1->event_id);
+		if (!filter_type2)
+			break;
+		if (filter_type1->filter->type != filter_type2->filter->type)
+			break;
+		/* The best way to compare complex filters is with strings */
+		str1 = arg_to_str(filter1, filter_type1->filter);
+		str2 = arg_to_str(filter2, filter_type2->filter);
+		if (str1 && str2)
+			result = strcmp(str1, str2) != 0;
+		else
+			/* bail out if allocation fails */
+			result = 1;
+
+		free(str1);
+		free(str2);
+		if (result)
+			break;
+	}
+
+	if (i < filter1->filters)
+		return 0;
+	return 1;
+}
+
diff --git a/src/parse-utils.c b/src/parse-utils.c
new file mode 100644
index 0000000..9c38e1e
--- /dev/null
+++ b/src/parse-utils.c
@@ -0,0 +1,151 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ *
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <errno.h>
+
+#include "event-utils.h"
+#include "event-parse.h"
+#include "kbuffer.h"
+
+#define __weak __attribute__((weak))
+
+static int log_level = TEP_LOG_CRITICAL;
+
+/**
+ * tep_set_loglevel - set log level of the library
+ * @level: desired level of the library messages
+ */
+void tep_set_loglevel(enum tep_loglevel level)
+{
+	log_level = level;
+}
+
+/**
+ * tep_vprint - print library log messages
+ * @name: name of the library.
+ * @level: severity of the log message. This parameter is not used in this implementation, but as
+ *	   the function is weak and can be overridden, having the log level could be useful
+ *	   for other implementations.
+ * @print_err: whether to print the errno, if non zero.
+ * @fmt: printf format string of the message.
+ * @ap: list of printf parameters.
+ *
+ * This function is used to print all messages from traceevent, tracefs and trace-cmd libraries.
+ * It is defined as weak, so the application that uses those libraries can override it in order
+ * to implement its own logic for printing library logs.
+ *
+ * Return the value of errno at the function enter.
+ */
+int __weak tep_vprint(const char *name, enum tep_loglevel level,
+		      bool print_err, const char *fmt, va_list ap)
+{
+	return __tep_vprint(name, level, print_err, fmt, ap);
+}
+
+/**
+ * __tep_vprint - print library log messages
+ * @name: name of the library.
+ * @level: severity of the log message. This parameter is not used in this implementation, but as
+ *	   the function is weak and can be overridden, having the log level could be useful
+ *	   for other implementations.
+ * @print_err: whether to print the errno, if non zero.
+ * @fmt: printf format string of the message.
+ * @ap: list of printf parameters.
+ *
+ * This function is used to print all messages from traceevent, tracefs and trace-cmd libraries.
+ * It is defined as weak, so the application that uses those libraries can override it in order
+ * to implement its own logic for printing library logs.
+ *
+ * Return the value of errno at the function enter.
+ */
+int __tep_vprint(const char *name, enum tep_loglevel level,
+		      bool print_err, const char *fmt, va_list ap)
+{
+	int ret = errno;
+	FILE *fp = stdout;
+
+	if (level <= TEP_LOG_WARNING) {
+		fp = stderr;
+		if (errno && print_err) {
+			perror(name);
+			fprintf(stderr, "  ");
+		}
+	}
+	vfprintf(fp, fmt, ap);
+	fprintf(fp, "\n");
+
+	return ret;
+}
+
+void tep_warning(const char *fmt, ...)
+{
+	va_list ap;
+
+	if (log_level < TEP_LOG_WARNING)
+		return;
+
+	va_start(ap, fmt);
+	tep_vprint("libtraceevent", TEP_LOG_WARNING, true, fmt, ap);
+	va_end(ap);
+}
+
+
+void tep_info(const char *fmt, ...)
+{
+	va_list ap;
+
+	if (log_level < TEP_LOG_INFO)
+		return;
+
+	va_start(ap, fmt);
+	tep_vprint("libtraceevent", TEP_LOG_INFO, false, fmt, ap);
+	va_end(ap);
+}
+
+/* The below is for backward compatibility */
+int __weak tep_vwarning(const char *name, const char *fmt, va_list ap)
+{
+	return tep_vprint(name, TEP_LOG_WARNING, true, fmt, ap);
+}
+
+void pr_stat(const char *fmt, ...) __attribute__((weak, alias("tep_info")));
+void __pr_stat(const char *fmt, ...) __attribute__((weak, alias("tep_info")));
+
+void __weak __vpr_stat(const char *fmt, va_list ap)
+{
+	tep_vprint("libtraceevent", TEP_LOG_INFO, false, fmt, ap);
+}
+
+void vpr_stat(const char *fmt, va_list ap) __attribute__((weak, alias("__vpr_stat")));
+
+/**
+ * tep_kbuffer - return an allocated kbuffer that can be used for the tep handle
+ * @tep: the handle that will work with the kbuffer descriptor
+ *
+ * Allocates and returns a new kbuffer.
+ * The return must be freed by kbuffer_free();
+ */
+struct kbuffer *tep_kbuffer(struct tep_handle *tep)
+{
+	enum kbuffer_endian endian;
+	int long_size;
+
+	long_size = tep_get_long_size(tep);
+	if (long_size == 8)
+		long_size = KBUFFER_LSIZE_8;
+	else
+		long_size = KBUFFER_LSIZE_4;
+
+	if (tep_is_file_bigendian(tep))
+		endian = KBUFFER_ENDIAN_BIG;
+	else
+		endian = KBUFFER_ENDIAN_LITTLE;
+
+	return kbuffer_alloc(long_size, endian);
+}
diff --git a/src/tep_strerror.c b/src/tep_strerror.c
new file mode 100644
index 0000000..4ac2644
--- /dev/null
+++ b/src/tep_strerror.c
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: LGPL-2.1
+#undef _GNU_SOURCE
+#include <string.h>
+#include <stdio.h>
+
+#include "event-parse.h"
+
+#undef _PE
+#define _PE(code, str) str
+static const char * const tep_error_str[] = {
+	TEP_ERRORS
+};
+#undef _PE
+
+/*
+ * The tools so far have been using the strerror_r() GNU variant, that returns
+ * a string, be it the buffer passed or something else.
+ *
+ * But that, besides being tricky in cases where we expect that the function
+ * using strerror_r() returns the error formatted in a provided buffer (we have
+ * to check if it returned something else and copy that instead), breaks the
+ * build on systems not using glibc, like Alpine Linux, where musl libc is
+ * used.
+ *
+ * So, introduce yet another wrapper, str_error_r(), that has the GNU
+ * interface, but uses the portable XSI variant of strerror_r(), so that users
+ * rest asured that the provided buffer is used and it is what is returned.
+ */
+int tep_strerror(struct tep_handle *tep __maybe_unused,
+		 enum tep_errno errnum, char *buf, size_t buflen)
+{
+	const char *msg;
+	int idx;
+
+	if (!buflen)
+		return 0;
+
+	if (errnum >= 0) {
+		int err = strerror_r(errnum, buf, buflen);
+		buf[buflen - 1] = 0;
+		return err;
+	}
+
+	if (errnum <= __TEP_ERRNO__START ||
+	    errnum >= __TEP_ERRNO__END)
+		return -1;
+
+	idx = errnum - __TEP_ERRNO__START - 1;
+	msg = tep_error_str[idx];
+	snprintf(buf, buflen, "%s", msg);
+
+	return 0;
+}
diff --git a/src/trace-seq.c b/src/trace-seq.c
new file mode 100644
index 0000000..8d5ecd2
--- /dev/null
+++ b/src/trace-seq.c
@@ -0,0 +1,249 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2009 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ *
+ */
+#include "trace-seq.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+
+#include <asm/bug.h>
+#include "event-parse.h"
+#include "event-utils.h"
+
+/*
+ * The TRACE_SEQ_POISON is to catch the use of using
+ * a trace_seq structure after it was destroyed.
+ */
+#define TRACE_SEQ_POISON	((void *)0xdeadbeef)
+#define TRACE_SEQ_CHECK(s)						\
+do {									\
+	if (WARN_ONCE((s)->buffer == TRACE_SEQ_POISON,			\
+		      "Usage of trace_seq after it was destroyed"))	\
+		(s)->state = TRACE_SEQ__BUFFER_POISONED;		\
+} while (0)
+
+#define TRACE_SEQ_CHECK_RET_N(s, n)		\
+do {						\
+	TRACE_SEQ_CHECK(s);			\
+	if ((s)->state != TRACE_SEQ__GOOD)	\
+		return n; 			\
+} while (0)
+
+#define TRACE_SEQ_CHECK_RET(s)   TRACE_SEQ_CHECK_RET_N(s, )
+#define TRACE_SEQ_CHECK_RET0(s)  TRACE_SEQ_CHECK_RET_N(s, 0)
+
+/**
+ * trace_seq_init - initialize the trace_seq structure
+ * @s: a pointer to the trace_seq structure to initialize
+ */
+void trace_seq_init(struct trace_seq *s)
+{
+	s->len = 0;
+	s->readpos = 0;
+	s->buffer_size = TRACE_SEQ_BUF_SIZE;
+	s->buffer = malloc(s->buffer_size);
+	if (s->buffer != NULL)
+		s->state = TRACE_SEQ__GOOD;
+	else
+		s->state = TRACE_SEQ__MEM_ALLOC_FAILED;
+}
+
+/**
+ * trace_seq_reset - re-initialize the trace_seq structure
+ * @s: a pointer to the trace_seq structure to reset
+ */
+void trace_seq_reset(struct trace_seq *s)
+{
+	if (!s)
+		return;
+	TRACE_SEQ_CHECK(s);
+	s->len = 0;
+	s->readpos = 0;
+}
+
+/**
+ * trace_seq_destroy - free up memory of a trace_seq
+ * @s: a pointer to the trace_seq to free the buffer
+ *
+ * Only frees the buffer, not the trace_seq struct itself.
+ */
+void trace_seq_destroy(struct trace_seq *s)
+{
+	if (!s)
+		return;
+	TRACE_SEQ_CHECK_RET(s);
+	free(s->buffer);
+	s->buffer = TRACE_SEQ_POISON;
+}
+
+static void expand_buffer(struct trace_seq *s)
+{
+	char *buf;
+
+	buf = realloc(s->buffer, s->buffer_size + TRACE_SEQ_BUF_SIZE);
+	if (WARN_ONCE(!buf, "Can't allocate trace_seq buffer memory")) {
+		s->state = TRACE_SEQ__MEM_ALLOC_FAILED;
+		return;
+	}
+
+	s->buffer = buf;
+	s->buffer_size += TRACE_SEQ_BUF_SIZE;
+}
+
+/**
+ * trace_seq_printf - sequence printing of trace information
+ * @s: trace sequence descriptor
+ * @fmt: printf format string
+ *
+ * It returns 0 if the trace oversizes the buffer's free
+ * space, the number of characters printed, or a negative
+ * value in case of an error.
+ *
+ * The tracer may use either sequence operations or its own
+ * copy to user routines. To simplify formating of a trace
+ * trace_seq_printf is used to store strings into a special
+ * buffer (@s). Then the output may be either used by
+ * the sequencer or pulled into another buffer.
+ */
+int
+trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
+{
+	va_list ap;
+	int len;
+	int ret;
+
+ try_again:
+	TRACE_SEQ_CHECK_RET0(s);
+
+	len = (s->buffer_size - 1) - s->len;
+
+	va_start(ap, fmt);
+	ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
+	va_end(ap);
+
+	if (ret >= len) {
+		expand_buffer(s);
+		goto try_again;
+	}
+
+	if (ret > 0)
+		s->len += ret;
+
+	return ret;
+}
+
+/**
+ * trace_seq_vprintf - sequence printing of trace information
+ * @s: trace sequence descriptor
+ * @fmt: printf format string
+ *
+ * It returns 0 if the trace oversizes the buffer's free
+ * space, the number of characters printed, or a negative
+ * value in case of an error.
+ * *
+ * The tracer may use either sequence operations or its own
+ * copy to user routines. To simplify formating of a trace
+ * trace_seq_printf is used to store strings into a special
+ * buffer (@s). Then the output may be either used by
+ * the sequencer or pulled into another buffer.
+ */
+int
+trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
+{
+	int len;
+	int ret;
+
+ try_again:
+	TRACE_SEQ_CHECK_RET0(s);
+
+	len = (s->buffer_size - 1) - s->len;
+
+	ret = vsnprintf(s->buffer + s->len, len, fmt, args);
+
+	if (ret >= len) {
+		expand_buffer(s);
+		goto try_again;
+	}
+
+	if (ret > 0)
+		s->len += ret;
+
+	return ret;
+}
+
+/**
+ * trace_seq_puts - trace sequence printing of simple string
+ * @s: trace sequence descriptor
+ * @str: simple string to record
+ *
+ * The tracer may use either the sequence operations or its own
+ * copy to user routines. This function records a simple string
+ * into a special buffer (@s) for later retrieval by a sequencer
+ * or other mechanism.
+ */
+int trace_seq_puts(struct trace_seq *s, const char *str)
+{
+	int len;
+
+	TRACE_SEQ_CHECK_RET0(s);
+
+	len = strlen(str);
+
+	while (len > ((s->buffer_size - 1) - s->len))
+		expand_buffer(s);
+
+	TRACE_SEQ_CHECK_RET0(s);
+
+	memcpy(s->buffer + s->len, str, len);
+	s->len += len;
+
+	return len;
+}
+
+int trace_seq_putc(struct trace_seq *s, unsigned char c)
+{
+	TRACE_SEQ_CHECK_RET0(s);
+
+	while (s->len >= (s->buffer_size - 1))
+		expand_buffer(s);
+
+	TRACE_SEQ_CHECK_RET0(s);
+
+	s->buffer[s->len++] = c;
+
+	return 1;
+}
+
+void trace_seq_terminate(struct trace_seq *s)
+{
+	TRACE_SEQ_CHECK_RET(s);
+
+	/* There's always one character left on the buffer */
+	s->buffer[s->len] = 0;
+}
+
+int trace_seq_do_fprintf(struct trace_seq *s, FILE *fp)
+{
+	TRACE_SEQ_CHECK(s);
+
+	switch (s->state) {
+	case TRACE_SEQ__GOOD:
+		return fprintf(fp, "%.*s", s->len, s->buffer);
+	case TRACE_SEQ__BUFFER_POISONED:
+		fprintf(fp, "%s\n", "Usage of trace_seq after it was destroyed");
+		break;
+	case TRACE_SEQ__MEM_ALLOC_FAILED:
+		fprintf(fp, "%s\n", "Can't allocate trace_seq buffer memory");
+		break;
+	}
+	return -1;
+}
+
+int trace_seq_do_printf(struct trace_seq *s)
+{
+	return trace_seq_do_fprintf(s, stdout);
+}
diff --git a/test.c b/test.c
new file mode 100644
index 0000000..7566fac
--- /dev/null
+++ b/test.c
@@ -0,0 +1,7 @@
+#include <event-parse.h>
+
+int main ()
+{
+	tep_load_plugins(NULL);
+	return 0;
+}
diff --git a/utest/.gitignore b/utest/.gitignore
new file mode 100644
index 0000000..3620cd0
--- /dev/null
+++ b/utest/.gitignore
@@ -0,0 +1 @@
+trace-utest
diff --git a/utest/Makefile b/utest/Makefile
new file mode 100644
index 0000000..160bdb4
--- /dev/null
+++ b/utest/Makefile
@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: LGPL-2.1
+
+include $(src)/scripts/utils.mk
+
+TARGETS = $(bdir)/trace-utest
+
+OBJS =
+OBJS += trace-utest.o
+OBJS += traceevent-utest.o
+
+LIBS += -lcunit				\
+	-ldl				\
+	$(LIBTRACEEVENT_STATIC)
+
+OBJS := $(OBJS:%.o=$(bdir)/%.o)
+DEPS := $(OBJS:$(bdir)/%.o=$(bdir)/.%.d)
+
+$(OBJS): | $(bdir)
+$(DEPS): | $(bdir)
+
+$(bdir)/trace-utest: $(OBJS) $(LIBTRACEEVENT_STATIC)
+	$(Q)$(do_app_build)
+
+$(bdir)/%.o: %.c
+	$(Q)$(call do_fpic_compile)
+
+$(DEPS): $(bdir)/.%.d: %.c
+	$(Q)$(CC) -M $(CPPFLAGS) $(CFLAGS) $< > $@
+	$(Q)$(CC) -M -MT $(bdir)/$*.o $(CPPFLAGS) $(CFLAGS) $< > $@
+
+$(OBJS): $(bdir)/%.o : $(bdir)/.%.d
+
+dep_includes := $(wildcard $(DEPS))
+
+test: $(TARGETS)
+
+clean:
+	$(Q)$(call do_clean,$(TARGETS) $(bdir)/*.o $(bdir)/.*.d)
diff --git a/utest/README b/utest/README
new file mode 100644
index 0000000..87d6bd9
--- /dev/null
+++ b/utest/README
@@ -0,0 +1,17 @@
+
+Unit tests for libtraceevent library. The tests use CUnit framework:
+
+ http://cunit.sourceforge.net/
+
+which must be pre installed on the system, before building the unit tests.
+The framework can be downloaded, compiled and installed manually, or
+using a precompiled distro package:
+
+ Fedora:
+	 CUnit
+	 CUnit-devel
+
+ Ubuntu and Debian:
+	libcunit1
+	libcunit1-doc
+	libcunit1-dev
diff --git a/utest/trace-utest.c b/utest/trace-utest.c
new file mode 100644
index 0000000..1403c86
--- /dev/null
+++ b/utest/trace-utest.c
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2020, VMware, Tzvetomir Stoyanov <tz.stoyanov@gmail.com>
+ *
+ * Modified from libtracefs to libtraceevent:
+ *   Copyright (C) 2021, VMware, Steven Rostedt <rostedt@goodmis.org>
+ *
+ */
+#include <stdio.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <stdlib.h>
+
+#include <CUnit/CUnit.h>
+#include <CUnit/Basic.h>
+
+#include "trace-utest.h"
+
+enum unit_tests {
+	RUN_NONE	= 0,
+	RUN_TRACEEVENT	= (1 << 0),
+	RUN_ALL		= 0xFFFF
+};
+
+static void print_help(char **argv)
+{
+	printf("Usage: %s [OPTIONS]\n", basename(argv[0]));
+	printf("\t-s, --silent\tPrint test summary\n");
+	printf("\t-r, --run test\tRun specific test:\n");
+	printf("\t\t  traceevent   run libtraceevent tests\n");
+	printf("\t-h, --help\tPrint usage information\n");
+	exit(0);
+}
+
+int main(int argc, char **argv)
+{
+	CU_BasicRunMode verbose = CU_BRM_VERBOSE;
+	enum unit_tests tests = RUN_NONE;
+
+	for (;;) {
+		int c;
+		int index = 0;
+		const char *opts = "+hsr:";
+		static struct option long_options[] = {
+			{"silent", no_argument, NULL, 's'},
+			{"run", required_argument, NULL, 'r'},
+			{"help", no_argument, NULL, 'h'},
+			{NULL, 0, NULL, 0}
+		};
+
+		c = getopt_long (argc, argv, opts, long_options, &index);
+		if (c == -1)
+			break;
+		switch (c) {
+		case 'r':
+			if (strcmp(optarg, "traceevent") == 0)
+				tests |= RUN_TRACEEVENT;
+			else
+				print_help(argv);
+			break;
+		case 's':
+			verbose = CU_BRM_SILENT;
+			break;
+		case 'h':
+		default:
+			print_help(argv);
+			break;
+		}
+	}
+
+	if (tests == RUN_NONE)
+		tests = RUN_ALL;
+
+	if (CU_initialize_registry() != CUE_SUCCESS) {
+		printf("Test registry cannot be initialized\n");
+		return -1;
+	}
+
+	if (tests & RUN_TRACEEVENT)
+		test_traceevent_lib();
+
+	CU_basic_set_mode(verbose);
+	CU_basic_run_tests();
+	CU_cleanup_registry();
+	return 0;
+}
diff --git a/utest/trace-utest.h b/utest/trace-utest.h
new file mode 100644
index 0000000..2aa3455
--- /dev/null
+++ b/utest/trace-utest.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: LGPL-2.1 */
+/*
+ * Copyright (C) 2020, VMware, Tzvetomir Stoyanov <tz.stoyanov@gmail.com>
+ *
+ * Modified from libtracefs to libtraceevent:
+ *   Copyright (C) 2021, VMware, Steven Rostedt <rostedt@goodmis.org>
+ *
+ */
+#ifndef _TRACE_UTEST_H_
+#define _TRACE_UTEST_H_
+
+void test_traceevent_lib(void);
+
+#endif /* _TRACE_UTEST_H_ */
diff --git a/utest/traceevent-utest.c b/utest/traceevent-utest.c
new file mode 100644
index 0000000..ebd5eb9
--- /dev/null
+++ b/utest/traceevent-utest.c
@@ -0,0 +1,429 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2020, VMware, Tzvetomir Stoyanov <tz.stoyanov@gmail.com>
+ *
+ * Modified from libtracefs to libtraceevent:
+ *   Copyright (C) 2021, VMware, Steven Rostedt <rostedt@goodmis.org>
+ *
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <time.h>
+#include <dirent.h>
+#include <ftw.h>
+
+#include <CUnit/CUnit.h>
+#include <CUnit/Basic.h>
+
+#include "event-parse.h"
+#include "trace-seq.h"
+
+#define TRACEEVENT_SUITE	"traceevent library"
+
+#define DYN_STR_EVENT_SYSTEM		"irq"
+#define DYN_STR_FIELD			"name"
+#define DYN_STRING			"hello"
+#define DYN_STRING_FMT			"irq=0 handler=hello"
+static const char dyn_str_event[] =
+	"name: irq_handler_entry\n"
+	"ID: 1\n"
+	"format:\n"
+	"\tfield:unsigned short common_type;\toffset:0;\tsize:2;\tsigned:0;\n"
+	"\tfield:unsigned char common_flags;\toffset:2;\tsize:1;\tsigned:0;\n"
+	"\tfield:unsigned char common_preempt_count;\toffset:3;\tsize:1;\tsigned:0;\n"
+	"\tfield:int common_pid;\toffset:4;\tsize:4;\tsigned:1;\n"
+	"\n"
+        "\tfield:int irq;\toffset:8;\tsize:4;\tsigned:1;\n"
+        "\tfield:__data_loc char[] name;\toffset:12;\tsize:4;\tsigned:1;\n"
+	"\n"
+	"print fmt: \"irq=%d handler=%s\", REC->irq, __get_str(name)\n";
+
+static char dyn_str_data[] = {
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+	/* common type */		1, 0x00,
+#else
+	/* common type */		0x00, 1
+#endif
+	/* common flags */		0x00,
+	/* common_preempt_count */	0x00,
+	/* common_pid */		0x00, 0x00, 0x00, 0x00,
+	/* irq */			0x00, 0x00, 0x00, 0x00,
+
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+	/* name : offset */		16, 0x00,
+	/* name : length */		6, 0x00,
+#else
+	/* name : length */		0x00, 6,
+	/* name : offset */		0x00, 16,
+#endif
+	/* name */			'h', 'e', 'l', 'l', 'o', '\0',
+	/* padding */			0x00, 0x00
+};
+static void *dyn_str_event_data = (void *)dyn_str_data;
+
+static const char dyn_str_old_event[] =
+	"name: irq_handler_entry\n"
+	"ID: 2\n"
+	"format:\n"
+	"\tfield:unsigned short common_type;\toffset:0;\tsize:2;\n"
+	"\tfield:unsigned char common_flags;\toffset:2;\tsize:1;\n"
+	"\tfield:unsigned char common_preempt_count;\toffset:3;\tsize:1;\n"
+	"\tfield:int common_pid;\toffset:4;\tsize:4;\n"
+	"\n"
+        "\tfield:int irq;\toffset:8;\tsize:4;\n"
+        "\tfield:__data_loc name;\toffset:12;\tsize:2;\n"
+	"\n"
+	"print fmt: \"irq=%d handler=%s\", REC->irq, __get_str(name)\n";
+
+static char dyn_str_old_data[] = {
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+	/* common type */		2, 0x00,
+#else
+	/* common type */		0x00, 2
+#endif
+	/* common flags */		0x00,
+	/* common_preempt_count */	0x00,
+	/* common_pid */		0x00, 0x00, 0x00, 0x00,
+	/* irq */			0x00, 0x00, 0x00, 0x00,
+
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+	/* name : offset */		16, 0x00,
+#else
+	/* name : offset */		0x00, 16,
+#endif
+	/* padding */			0x00, 0x00,
+	/* name */			'h', 'e', 'l', 'l', 'o', '\0',
+	/* padding */			0x00, 0x00, 0x00
+};
+static void *dyn_str_old_event_data = (void *)dyn_str_old_data;
+
+#define CPUMASK_EVENT_SYSTEM "ipi"
+#define CPUMASK_EVENT_FIELD  "cpumask"
+static const char cpumask_event_format[] =
+	"name: ipi_send_cpumask\n"
+	"ID: 3\n"
+	"format:\n"
+	"\tfield:unsigned short common_type;\toffset:0;\tsize:2;\n"
+	"\tfield:unsigned char common_flags;\toffset:2;\tsize:1;\n"
+	"\tfield:unsigned char common_preempt_count;\toffset:3;\tsize:1;\n"
+	"\tfield:int common_pid;\toffset:4;\tsize:4;\n"
+	"\n"
+	"\tfield:__data_loc cpumask_t *[] cpumask;\toffset:8;\tsize:4;\tsigned:0;\n"
+	"\n"
+	"print fmt: \"cpumask=%s\", __get_cpumask(cpumask)\n";
+
+/* Mind the endianness! */
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+#define DECL_CPUMASK_EVENT_DATA(name, args...)			\
+	static char cpumask_##name##_event_data[] = {		\
+	/* common type */		3, 0x00,                \
+	/* common flags */		0x00,                   \
+	/* common_preempt_count */	0x00,                   \
+	/* common_pid */		0x00, 0x00, 0x00, 0x00, \
+	/* [offset, size] */            16, 0x00, 8, 0x00,      \
+	/* padding */			0x00, 0x00, 0x00, 0x00, \
+	/* cpumask */                   args,                   \
+}
+#else
+#define DECL_CPUMASK_EVENT_DATA(name, args...)			\
+static char cpumask_##name##_event_data[] = {                       \
+	/* common type */		0x00, 3,                \
+	/* common flags */		0x00,                   \
+	/* common_preempt_count */	0x00,                   \
+	/* common_pid */		0x00, 0x00, 0x00, 0x00, \
+	/* [offset, size] */            0x00, 8, 0x00, 16,      \
+	/* padding */			0x00, 0x00, 0x00, 0x00, \
+	/* cpumask */                   args,                   \
+}
+#endif
+
+#define SIZEOF_LONG0_FMT "[FAILED TO PARSE] s4=0 u4=0 s8=0 u8=0x0"
+#define SIZEOF_LONG4_FMT "int=4 unsigned=4 unsigned int=4 long=4 unsigned long=4 long long=8 unsigned long long=8 s4=4 u4=4 s8=8 u8=8"
+#define SIZEOF_LONG8_FMT "int=4 unsigned=4 unsigned int=4 long=8 unsigned long=8 long long=8 unsigned long long=8 s4=4 u4=4 s8=8 u8=8"
+
+static const char size_of_event[] =
+	"name: sizeof_event\n"
+	"ID: 23\n"
+	"format:\n"
+	"\tfield:unsigned short common_type;\toffset:0;\tsize:2;\tsigned:0;\n"
+	"\tfield:unsigned char common_flags;\toffset:2;\tsize:1;\tsigned:0;\n"
+	"\tfield:unsigned char common_preempt_count;\toffset:3;\tsize:1;\tsigned:0;\n"
+	"\tfield:int common_pid;\toffset:4;\tsize:4;\tsigned:1;\n"
+	"\n"
+        "\tfield:int s4;\toffset:8;\tsize:4;\tsigned:1;\n"
+        "\tfield:unsigned int u4;\toffset:12;\tsize:4;\tsigned:0;\n"
+        "\tfield:long long s8;\toffset:16;\tsize:8;\tsigned:1;\n"
+        "\tfield:unsigned long long u8;\toffset:24;\tsize:8;\tsigned:0;\n"
+	"\n"
+	"print fmt: \"int=%d unsigned=%d unsigned int=%d long=%d unsigned long=%d long long=%d unsigned long long=%d s4=%d u4=%d s8=%d u8=%d\", "
+	"sizeof(int), sizeof(unsigned), sizeof(unsigned int), sizeof(long), sizeof(unsigned long), "
+	"sizeof(long long), sizeof(unsigned long long), sizeof(REC->s4), "
+	"sizeof(REC->u4), sizeof(REC->s8), sizeof(REC->u8))\n";
+static char sizeof_data[] = {
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+	/* common type */		23, 0x00,
+#else
+	/* common type */		0x00, 23
+#endif
+	/* common flags */		0x00,
+	/* common_preempt_count */	0x00,
+	/* common_pid */		0x00, 0x00, 0x00, 0x00,
+	/* irq */			0x00, 0x00, 0x00, 0x00,
+
+	/* s4 */			0x00, 0x00, 0x00, 0x00,
+	/* u4 */			0x00, 0x00, 0x00, 0x00,
+	/* s8 */			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	/* u8 */			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+};
+static void *sizeof_event_data = (void *)sizeof_data;
+
+DECL_CPUMASK_EVENT_DATA(full, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff);
+#define CPUMASK_FULL     "ARRAY[ff, ff, ff, ff, ff, ff, ff, ff]"
+#define CPUMASK_FULL_FMT "cpumask=0-63"
+
+DECL_CPUMASK_EVENT_DATA(empty, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
+#define CPUMASK_EMPTY     "ARRAY[00, 00, 00, 00, 00, 00, 00, 00]"
+#define CPUMASK_EMPTY_FMT "cpumask="
+
+DECL_CPUMASK_EVENT_DATA(half, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55);
+#define CPUMASK_HALF     "ARRAY[55, 55, 55, 55, 55, 55, 55, 55]"
+#define CPUMASK_HALF_FMT "cpumask=0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62"
+
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+DECL_CPUMASK_EVENT_DATA(bytep1, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
+#define CPUMASK_BYTEP1     "ARRAY[01, 80, 00, 00, 00, 00, 00, 00]"
+#define CPUMASK_BYTEP1_FMT "cpumask=0,15"
+
+DECL_CPUMASK_EVENT_DATA(bytep2, 0x01, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00);
+#define CPUMASK_BYTEP2     "ARRAY[01, 00, 80, 00, 00, 00, 00, 00]"
+#define CPUMASK_BYTEP2_FMT "cpumask=0,23"
+
+DECL_CPUMASK_EVENT_DATA(bytepn, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80);
+#define CPUMASK_BYTEPN     "ARRAY[01, 00, 00, 00, 00, 00, 00, 80]"
+#define CPUMASK_BYTEPN_FMT "cpumask=0,63"
+
+#else
+
+DECL_CPUMASK_EVENT_DATA(bytep1, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x01);
+#define CPUMASK_BYTEP1     "ARRAY[00, 00, 00, 00, 00, 00, 80, 01]"
+#define CPUMASK_BYTEP1_FMT "cpumask=0,15"
+
+DECL_CPUMASK_EVENT_DATA(bytep2, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x01);
+#define CPUMASK_BYTEP2     "ARRAY[00, 00, 00, 00, 00, 80, 00, 01]"
+#define CPUMASK_BYTEP2_FMT "cpumask=0,23"
+
+DECL_CPUMASK_EVENT_DATA(bytepn, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01);
+#define CPUMASK_BYTEPN     "ARRAY[80, 00, 00, 00, 00, 00, 80, 01]"
+#define CPUMASK_BYTEPN_FMT "cpumask=0,63"
+#endif
+
+static struct tep_handle *test_tep;
+static struct trace_seq *test_seq;
+static struct trace_seq seq_storage;
+
+static void parse_dyn_str(const char *dyn_str, void *data, int size)
+{
+	struct tep_format_field *field;
+	struct tep_event *event;
+	struct tep_record record;
+
+	record.data = data;
+	record.size = size;
+
+	CU_TEST(tep_parse_format(test_tep, &event,
+				 dyn_str, strlen(dyn_str),
+				DYN_STR_EVENT_SYSTEM) == TEP_ERRNO__SUCCESS);
+
+	field = tep_find_any_field(event, DYN_STR_FIELD);
+	CU_TEST(field != NULL);
+	trace_seq_reset(test_seq);
+	tep_print_field_content(test_seq, data, size, field);
+	CU_TEST(strcmp(test_seq->buffer, DYN_STRING) == 0);
+
+	trace_seq_reset(test_seq);
+	tep_print_event(test_tep, test_seq, &record, "%s", TEP_PRINT_INFO);
+	trace_seq_do_printf(test_seq);
+	CU_TEST(strcmp(test_seq->buffer, DYN_STRING_FMT) == 0);
+}
+
+static void test_parse_dyn_str_event(void)
+{
+	parse_dyn_str(dyn_str_event, dyn_str_event_data, sizeof(dyn_str_data));
+}
+
+static void test_parse_dyn_str_old_event(void)
+{
+	parse_dyn_str(dyn_str_old_event, dyn_str_old_event_data, sizeof(dyn_str_old_data));
+}
+
+static void parse_cpumask(const char *format, void *data, int size,
+			  const char* expected_raw, const char* expected)
+{
+	struct tep_format_field *field;
+	struct tep_event *event;
+	struct tep_record record;
+
+	record.data = data;
+	record.size = size;
+
+	CU_TEST(tep_parse_format(test_tep, &event,
+				 format, strlen(format),
+				 CPUMASK_EVENT_SYSTEM) == TEP_ERRNO__SUCCESS);
+
+	field = tep_find_any_field(event, CPUMASK_EVENT_FIELD);
+	CU_TEST(field != NULL);
+
+	trace_seq_reset(test_seq);
+	tep_print_field_content(test_seq, data, size, field);
+	CU_TEST(strcmp(test_seq->buffer, expected_raw) == 0);
+
+	trace_seq_reset(test_seq);
+	tep_print_event(test_tep, test_seq, &record, "%s", TEP_PRINT_INFO);
+	trace_seq_do_printf(test_seq);
+	CU_TEST(strcmp(test_seq->buffer, expected) == 0);
+}
+
+static void test_parse_cpumask_full(void)
+{
+	parse_cpumask(cpumask_event_format,
+		      cpumask_full_event_data, sizeof(cpumask_full_event_data),
+		      CPUMASK_FULL, CPUMASK_FULL_FMT);
+}
+
+static void test_parse_cpumask_empty(void)
+{
+	parse_cpumask(cpumask_event_format,
+		      cpumask_empty_event_data, sizeof(cpumask_empty_event_data),
+		      CPUMASK_EMPTY, CPUMASK_EMPTY_FMT);
+}
+
+static void test_parse_cpumask_half(void)
+{
+	parse_cpumask(cpumask_event_format,
+		      cpumask_half_event_data, sizeof(cpumask_half_event_data),
+		      CPUMASK_HALF, CPUMASK_HALF_FMT);
+}
+
+static void test_parse_cpumask_bytep1(void)
+{
+	parse_cpumask(cpumask_event_format,
+		      cpumask_bytep1_event_data, sizeof(cpumask_bytep1_event_data),
+		      CPUMASK_BYTEP1, CPUMASK_BYTEP1_FMT);
+}
+
+static void test_parse_cpumask_bytep2(void)
+{
+	parse_cpumask(cpumask_event_format,
+		      cpumask_bytep2_event_data, sizeof(cpumask_bytep2_event_data),
+		      CPUMASK_BYTEP2, CPUMASK_BYTEP2_FMT);
+}
+
+static void test_parse_cpumask_bytepn(void)
+{
+	parse_cpumask(cpumask_event_format,
+		      cpumask_bytepn_event_data, sizeof(cpumask_bytepn_event_data),
+		      CPUMASK_BYTEPN, CPUMASK_BYTEPN_FMT);
+}
+
+static void test_parse_sizeof(int long_size, int value, const char *system,
+			      const char *test_str)
+{
+	struct tep_event *event;
+	struct tep_record record;
+	char *sizeof_event;
+	char *p;
+
+	tep_set_long_size(test_tep, long_size);
+
+	record.data = sizeof_event_data;
+	record.size = sizeof(sizeof_data);
+
+	sizeof_event = strdup(size_of_event);
+	CU_TEST(sizeof_event != NULL);
+
+	/* Set a new id */
+	p = strstr(sizeof_event, "ID: 2");
+	p[5] = '0' + value;
+
+	/* Handles endianess */
+	*(unsigned short *)sizeof_data = 20 + value;
+
+	CU_TEST(tep_parse_format(test_tep, &event, sizeof_event,
+				 strlen(sizeof_event),
+				 system) == TEP_ERRNO__SUCCESS);
+
+	trace_seq_reset(test_seq);
+	tep_print_event(test_tep, test_seq, &record, "%s", TEP_PRINT_INFO);
+	trace_seq_do_printf(test_seq);
+	CU_TEST(strcmp(test_seq->buffer, test_str) == 0);
+
+	free(sizeof_event);
+}
+
+static void test_parse_sizeof8(void)
+{
+	test_parse_sizeof(8, 3, "sizeof8", SIZEOF_LONG8_FMT);
+}
+
+static void test_parse_sizeof4(void)
+{
+	test_parse_sizeof(4, 4, "sizeof4", SIZEOF_LONG4_FMT);
+}
+
+static void test_parse_sizeof_undef(void)
+{
+	test_parse_sizeof(0, 5, "sizeof_undef", SIZEOF_LONG0_FMT);
+}
+
+static int test_suite_destroy(void)
+{
+	tep_free(test_tep);
+	trace_seq_destroy(test_seq);
+	return 0;
+}
+
+static int test_suite_init(void)
+{
+	test_seq = &seq_storage;
+	trace_seq_init(test_seq);
+	test_tep = tep_alloc();
+	if (!test_tep)
+		return 1;
+	return 0;
+}
+
+void test_traceevent_lib(void)
+{
+	CU_pSuite suite = NULL;
+
+	suite = CU_add_suite(TRACEEVENT_SUITE, test_suite_init, test_suite_destroy);
+	if (suite == NULL) {
+		fprintf(stderr, "Suite \"%s\" cannot be ceated\n", TRACEEVENT_SUITE);
+		return;
+	}
+	CU_add_test(suite, "parse dynamic string event",
+		    test_parse_dyn_str_event);
+	CU_add_test(suite, "parse old dynamic string event",
+		    test_parse_dyn_str_old_event);
+	CU_add_test(suite, "parse full cpumask",
+		    test_parse_cpumask_full);
+	CU_add_test(suite, "parse empty cpumask",
+		    test_parse_cpumask_empty);
+	CU_add_test(suite, "parse half-filled cpumask",
+		    test_parse_cpumask_half);
+	CU_add_test(suite, "parse cpumask spanning 2 bytes",
+		    test_parse_cpumask_bytep1);
+	CU_add_test(suite, "parse cpumask spanning 3 bytes",
+		    test_parse_cpumask_bytep2);
+	CU_add_test(suite, "parse cpumask spanning all bytes",
+		    test_parse_cpumask_bytepn);
+	CU_add_test(suite, "parse sizeof() 8byte values",
+		    test_parse_sizeof8);
+	CU_add_test(suite, "parse sizeof() 4byte values",
+		    test_parse_sizeof4);
+	CU_add_test(suite, "parse sizeof() no long size defined",
+		    test_parse_sizeof_undef);
+}