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diff --git a/bifrost/r25p0/kernel/drivers/gpu/arm/midgard/mali_kbase_sync.h b/bifrost/r25p0/kernel/drivers/gpu/arm/midgard/mali_kbase_sync.h
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+++ b/bifrost/r25p0/kernel/drivers/gpu/arm/midgard/mali_kbase_sync.h
@@ -0,0 +1,223 @@
+/*
+ *
+ * (C) COPYRIGHT 2012-2016, 2018-2019 ARM Limited. All rights reserved.
+ *
+ * This program is free software and is provided to you under the terms of the
+ * GNU General Public License version 2 as published by the Free Software
+ * Foundation, and any use by you of this program is subject to the terms
+ * of such GNU licence.
+ *
+ * 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, you can access it online at
+ * http://www.gnu.org/licenses/gpl-2.0.html.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ *
+ */
+
+/**
+ * @file mali_kbase_sync.h
+ *
+ * This file contains our internal "API" for explicit fences.
+ * It hides the implementation details of the actual explicit fence mechanism
+ * used (Android fences or sync file with DMA fences).
+ */
+
+#ifndef MALI_KBASE_SYNC_H
+#define MALI_KBASE_SYNC_H
+
+#include <linux/syscalls.h>
+#ifdef CONFIG_SYNC
+#include <sync.h>
+#endif
+#ifdef CONFIG_SYNC_FILE
+#include "mali_kbase_fence_defs.h"
+#include <linux/sync_file.h>
+#endif
+
+#include "mali_kbase.h"
+
+/**
+ * struct kbase_sync_fence_info - Information about a fence
+ * @fence: Pointer to fence (type is void*, as underlaying struct can differ)
+ * @name: The name given to this fence when it was created
+ * @status: < 0 means error, 0 means active, 1 means signaled
+ *
+ * Use kbase_sync_fence_in_info_get() or kbase_sync_fence_out_info_get()
+ * to get the information.
+ */
+struct kbase_sync_fence_info {
+	void *fence;
+	char name[32];
+	int status;
+};
+
+/**
+ * kbase_sync_fence_stream_create() - Create a stream object
+ * @name: Name of stream (only used to ease debugging/visualization)
+ * @out_fd: A file descriptor representing the created stream object
+ *
+ * Can map down to a timeline implementation in some implementations.
+ * Exposed as a file descriptor.
+ * Life-time controlled via the file descriptor:
+ * - dup to add a ref
+ * - close to remove a ref
+ *
+ * return: 0 on success, < 0 on error
+ */
+int kbase_sync_fence_stream_create(const char *name, int *const out_fd);
+
+/**
+ * kbase_sync_fence_out_create Create an explicit output fence to specified atom
+ * @katom: Atom to assign the new explicit fence to
+ * @stream_fd: File descriptor for stream object to create fence on
+ *
+ * return: Valid file descriptor to fence or < 0 on error
+ */
+int kbase_sync_fence_out_create(struct kbase_jd_atom *katom, int stream_fd);
+
+/**
+ * kbase_sync_fence_in_from_fd() Assigns an existing fence to specified atom
+ * @katom: Atom to assign the existing explicit fence to
+ * @fd: File descriptor to an existing fence
+ *
+ * Assigns an explicit input fence to atom.
+ * This can later be waited for by calling @kbase_sync_fence_in_wait
+ *
+ * return: 0 on success, < 0 on error
+ */
+int kbase_sync_fence_in_from_fd(struct kbase_jd_atom *katom, int fd);
+
+/**
+ * kbase_sync_fence_validate() - Validate a fd to be a valid fence
+ * @fd: File descriptor to check
+ *
+ * This function is only usable to catch unintentional user errors early,
+ * it does not stop malicious code changing the fd after this function returns.
+ *
+ * return 0: if fd is for a valid fence, < 0 if invalid
+ */
+int kbase_sync_fence_validate(int fd);
+
+/**
+ * kbase_sync_fence_out_trigger - Signal explicit output fence attached on katom
+ * @katom: Atom with an explicit fence to signal
+ * @result: < 0 means signal with error, 0 >= indicates success
+ *
+ * Signal output fence attached on katom and remove the fence from the atom.
+ *
+ * return: The "next" event code for atom, typically JOB_CANCELLED or EVENT_DONE
+ */
+enum base_jd_event_code
+kbase_sync_fence_out_trigger(struct kbase_jd_atom *katom, int result);
+
+/**
+ * kbase_sync_fence_in_wait() - Wait for explicit input fence to be signaled
+ * @katom: Atom with explicit fence to wait for
+ *
+ * If the fence is already signaled, then 0 is returned, and the caller must
+ * continue processing of the katom.
+ *
+ * If the fence isn't already signaled, then this kbase_sync framework will
+ * take responsibility to continue the processing once the fence is signaled.
+ *
+ * return: 0 if already signaled, otherwise 1
+ */
+int kbase_sync_fence_in_wait(struct kbase_jd_atom *katom);
+
+/**
+ * kbase_sync_fence_in_cancel_wait() - Cancel explicit input fence waits
+ * @katom: Atom to cancel wait for
+ *
+ * This function is fully responsible for continuing processing of this atom
+ * (remove_waiting_soft_job + finish_soft_job + jd_done + js_sched_all)
+ */
+void kbase_sync_fence_in_cancel_wait(struct kbase_jd_atom *katom);
+
+/**
+ * kbase_sync_fence_in_remove() - Remove the input fence from the katom
+ * @katom: Atom to remove explicit input fence for
+ *
+ * This will also release the corresponding reference.
+ */
+void kbase_sync_fence_in_remove(struct kbase_jd_atom *katom);
+
+/**
+ * kbase_sync_fence_out_remove() - Remove the output fence from the katom
+ * @katom: Atom to remove explicit output fence for
+ *
+ * This will also release the corresponding reference.
+ */
+void kbase_sync_fence_out_remove(struct kbase_jd_atom *katom);
+
+/**
+ * kbase_sync_fence_close_fd() - Close a file descriptor representing a fence
+ * @fd: File descriptor to close
+ */
+static inline void kbase_sync_fence_close_fd(int fd)
+{
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 17, 0)
+	ksys_close(fd);
+#else
+	sys_close(fd);
+#endif
+}
+
+/**
+ * kbase_sync_fence_in_info_get() - Retrieves information about input fence
+ * @katom: Atom to get fence information from
+ * @info: Struct to be filled with fence information
+ *
+ * return: 0 on success, < 0 on error
+ */
+int kbase_sync_fence_in_info_get(struct kbase_jd_atom *katom,
+				 struct kbase_sync_fence_info *info);
+
+/**
+ * kbase_sync_fence_out_info_get() - Retrieves information about output fence
+ * @katom: Atom to get fence information from
+ * @info: Struct to be filled with fence information
+ *
+ * return: 0 on success, < 0 on error
+ */
+int kbase_sync_fence_out_info_get(struct kbase_jd_atom *katom,
+				  struct kbase_sync_fence_info *info);
+
+#if defined(CONFIG_SYNC_FILE)
+#if (KERNEL_VERSION(4, 10, 0) > LINUX_VERSION_CODE)
+void kbase_sync_fence_info_get(struct fence *fence,
+			       struct kbase_sync_fence_info *info);
+#else
+void kbase_sync_fence_info_get(struct dma_fence *fence,
+			       struct kbase_sync_fence_info *info);
+#endif
+#endif
+
+/**
+ * kbase_sync_status_string() - Get string matching @status
+ * @status: Value of fence status.
+ *
+ * return: Pointer to string describing @status.
+ */
+const char *kbase_sync_status_string(int status);
+
+
+/*
+ * Internal worker used to continue processing of atom.
+ */
+void kbase_sync_fence_wait_worker(struct work_struct *data);
+
+#ifdef CONFIG_MALI_FENCE_DEBUG
+/**
+ * kbase_sync_fence_in_dump() Trigger a debug dump of atoms input fence state
+ * @katom: Atom to trigger fence debug dump for
+ */
+void kbase_sync_fence_in_dump(struct kbase_jd_atom *katom);
+#endif
+
+#endif /* MALI_KBASE_SYNC_H */