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/*
* Copyright (C) 2023 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <optional>
#include "src/trace_processor/importers/etw/etw_tokenizer.h"
#include "perfetto/base/status.h"
#include "perfetto/ext/base/status_or.h"
#include "perfetto/protozero/proto_decoder.h"
#include "perfetto/protozero/proto_utils.h"
#include "src/trace_processor/importers/proto/packet_sequence_state.h"
#include "src/trace_processor/sorter/trace_sorter.h"
#include "src/trace_processor/storage/trace_storage.h"
#include "protos/perfetto/common/builtin_clock.pbzero.h"
#include "protos/perfetto/trace/etw/etw_event.pbzero.h"
#include "protos/perfetto/trace/etw/etw_event_bundle.pbzero.h"
namespace perfetto {
namespace trace_processor {
using protozero::ProtoDecoder;
using protozero::proto_utils::MakeTagVarInt;
using protozero::proto_utils::ParseVarInt;
using protos::pbzero::BuiltinClock;
using protos::pbzero::EtwTraceEventBundle;
PERFETTO_ALWAYS_INLINE
base::Status EtwTokenizer::TokenizeEtwBundle(TraceBlobView bundle,
PacketSequenceState* state) {
protos::pbzero::EtwTraceEventBundle::Decoder decoder(bundle.data(),
bundle.length());
// Cpu id can either be in the etw bundle or inside the individual
// EtwTraceEvent. If present at this level, we pass it to the TokenizeEtwEvent
// in case the EtwTraceEvent does not contain the cpu.
std::optional<uint32_t> bundle_cpu =
decoder.has_cpu() ? std::make_optional(decoder.cpu()) : std::nullopt;
for (auto it = decoder.event(); it; ++it) {
TokenizeEtwEvent(bundle_cpu, bundle.slice(it->data(), it->size()), state);
}
return base::OkStatus();
}
PERFETTO_ALWAYS_INLINE
base::Status EtwTokenizer::TokenizeEtwEvent(
std::optional<uint32_t> fallback_cpu,
TraceBlobView event,
PacketSequenceState* state) {
const uint8_t* data = event.data();
const size_t length = event.length();
ProtoDecoder decoder(data, length);
protos::pbzero::EtwTraceEvent::Decoder etw_decoder(data, length);
// Some ETW events lack CPU info; in that case, the bundle may
// provide it.
uint32_t cpu;
if (etw_decoder.has_cpu()) {
cpu = etw_decoder.cpu();
} else {
if (!fallback_cpu.has_value()) {
return base::ErrStatus(
"CPU field not found in EtwEvent and/or EtwEventBundle");
}
cpu = fallback_cpu.value();
}
static constexpr uint32_t kMaxCpuCount = 1024;
if (PERFETTO_UNLIKELY(cpu >= kMaxCpuCount)) {
return base::ErrStatus(
"CPU %u is greater than maximum allowed of %u. This is likely because "
"of trace corruption",
cpu, kMaxCpuCount);
}
uint64_t raw_timestamp = 0;
if (etw_decoder.has_timestamp()) {
raw_timestamp = etw_decoder.timestamp();
} else {
return base::ErrStatus("Timestamp field not found in EtwEvent");
}
base::StatusOr<int64_t> timestamp = static_cast<int64_t>(raw_timestamp);
// ClockTracker will increment some error stats if it failed to convert the
// timestamp so just return.
if (!timestamp.ok()) {
return timestamp.status();
}
context_->sorter->PushEtwEvent(cpu, *timestamp, std::move(event),
state->current_generation());
return base::OkStatus();
}
} // namespace trace_processor
} // namespace perfetto
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