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/*
* Copyright 2017 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.
*/
#undef LOG_TAG
#define LOG_TAG "SurfaceTracing"
#define ATRACE_TAG ATRACE_TAG_GRAPHICS
#include "SurfaceTracing.h"
#include <SurfaceFlinger.h>
#include <android-base/file.h>
#include <android-base/stringprintf.h>
#include <log/log.h>
#include <utils/SystemClock.h>
#include <utils/Trace.h>
namespace android {
SurfaceTracing::SurfaceTracing(SurfaceFlinger& flinger)
: mFlinger(flinger), mSfLock(flinger.mDrawingStateLock) {}
void SurfaceTracing::mainLoop() {
addFirstEntry();
bool enabled = true;
while (enabled) {
LayersTraceProto entry = traceWhenNotified();
enabled = addTraceToBuffer(entry);
}
}
void SurfaceTracing::addFirstEntry() {
LayersTraceProto entry;
{
std::scoped_lock lock(mSfLock);
entry = traceLayersLocked("tracing.enable");
}
addTraceToBuffer(entry);
}
LayersTraceProto SurfaceTracing::traceWhenNotified() {
std::unique_lock<std::mutex> lock(mSfLock);
mCanStartTrace.wait(lock);
android::base::ScopedLockAssertion assumeLock(mSfLock);
LayersTraceProto entry = traceLayersLocked(mWhere);
lock.unlock();
return entry;
}
bool SurfaceTracing::addTraceToBuffer(LayersTraceProto& entry) {
std::scoped_lock lock(mTraceLock);
mBuffer.emplace(std::move(entry));
if (mWriteToFile) {
writeProtoFileLocked();
mWriteToFile = false;
}
return mEnabled;
}
void SurfaceTracing::notify(const char* where) {
std::scoped_lock lock(mSfLock);
mWhere = where;
mCanStartTrace.notify_one();
}
void SurfaceTracing::writeToFileAsync() {
std::scoped_lock lock(mTraceLock);
mWriteToFile = true;
mCanStartTrace.notify_one();
}
void SurfaceTracing::LayersTraceBuffer::reset(size_t newSize) {
// use the swap trick to make sure memory is released
std::queue<LayersTraceProto>().swap(mStorage);
mSizeInBytes = newSize;
mUsedInBytes = 0U;
}
void SurfaceTracing::LayersTraceBuffer::emplace(LayersTraceProto&& proto) {
auto protoSize = proto.ByteSize();
while (mUsedInBytes + protoSize > mSizeInBytes) {
if (mStorage.empty()) {
return;
}
mUsedInBytes -= mStorage.front().ByteSize();
mStorage.pop();
}
mUsedInBytes += protoSize;
mStorage.emplace();
mStorage.back().Swap(&proto);
}
void SurfaceTracing::LayersTraceBuffer::flush(LayersTraceFileProto* fileProto) {
fileProto->mutable_entry()->Reserve(mStorage.size());
while (!mStorage.empty()) {
auto entry = fileProto->add_entry();
entry->Swap(&mStorage.front());
mStorage.pop();
}
}
void SurfaceTracing::enable() {
std::scoped_lock lock(mTraceLock);
if (mEnabled) {
return;
}
mBuffer.reset(mBufferSize);
mEnabled = true;
mThread = std::thread(&SurfaceTracing::mainLoop, this);
}
status_t SurfaceTracing::writeToFile() {
mThread.join();
return mLastErr;
}
bool SurfaceTracing::disable() {
std::scoped_lock lock(mTraceLock);
if (!mEnabled) {
return false;
}
mEnabled = false;
mWriteToFile = true;
mCanStartTrace.notify_all();
return true;
}
bool SurfaceTracing::isEnabled() const {
std::scoped_lock lock(mTraceLock);
return mEnabled;
}
void SurfaceTracing::setBufferSize(size_t bufferSizeInByte) {
std::scoped_lock lock(mTraceLock);
mBufferSize = bufferSizeInByte;
mBuffer.setSize(bufferSizeInByte);
}
void SurfaceTracing::setTraceFlags(uint32_t flags) {
std::scoped_lock lock(mSfLock);
mTraceFlags = flags;
}
LayersTraceProto SurfaceTracing::traceLayersLocked(const char* where) {
ATRACE_CALL();
LayersTraceProto entry;
entry.set_elapsed_realtime_nanos(elapsedRealtimeNano());
entry.set_where(where);
LayersProto layers(mFlinger.dumpProtoInfo(LayerVector::StateSet::Drawing, mTraceFlags));
entry.mutable_layers()->Swap(&layers);
return entry;
}
void SurfaceTracing::writeProtoFileLocked() {
ATRACE_CALL();
LayersTraceFileProto fileProto;
std::string output;
fileProto.set_magic_number(uint64_t(LayersTraceFileProto_MagicNumber_MAGIC_NUMBER_H) << 32 |
LayersTraceFileProto_MagicNumber_MAGIC_NUMBER_L);
mBuffer.flush(&fileProto);
mBuffer.reset(mBufferSize);
if (!fileProto.SerializeToString(&output)) {
ALOGE("Could not save the proto file! Permission denied");
mLastErr = PERMISSION_DENIED;
}
if (!android::base::WriteStringToFile(output, kDefaultFileName, S_IRWXU | S_IRGRP, getuid(),
getgid(), true)) {
ALOGE("Could not save the proto file! There are missing fields");
mLastErr = PERMISSION_DENIED;
}
mLastErr = NO_ERROR;
}
void SurfaceTracing::dump(std::string& result) const {
std::scoped_lock lock(mTraceLock);
base::StringAppendF(&result, "Tracing state: %s\n", mEnabled ? "enabled" : "disabled");
base::StringAppendF(&result, " number of entries: %zu (%.2fMB / %.2fMB)\n",
mBuffer.frameCount(), float(mBuffer.used()) / float(1_MB),
float(mBuffer.size()) / float(1_MB));
}
} // namespace android
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