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/*
* Copyright 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.
*/
#pragma once
#include "LayerTracing.h"
#include <perfetto/tracing.h>
#include <atomic>
namespace android {
/*
* Thread local storage used for fast (lock free) read of data source's properties.
*
*/
struct LayerDataSourceTlsState {
template <typename TraceContext>
explicit LayerDataSourceTlsState(const TraceContext& trace_context) {
auto dataSource = trace_context.GetDataSourceLocked();
mMode = dataSource.valid()
? dataSource->GetMode()
: perfetto::protos::pbzero::SurfaceFlingerLayersConfig::Mode::MODE_GENERATED;
}
LayerTracing::Mode mMode;
};
struct LayerDataSourceTraits : public perfetto::DefaultDataSourceTraits {
using TlsStateType = LayerDataSourceTlsState;
};
/*
* Defines the Perfetto custom data source 'android.surfaceflinger.layers'.
*
* Registers the data source with Perfetto, listens to Perfetto events (setup/start/flush/stop)
* and writes trace packets to Perfetto.
*
*/
class LayerDataSource : public perfetto::DataSource<LayerDataSource, LayerDataSourceTraits> {
public:
static void Initialize(LayerTracing&);
static void UnregisterLayerTracing();
void OnSetup(const SetupArgs&) override;
void OnStart(const StartArgs&) override;
void OnFlush(const FlushArgs&) override;
void OnStop(const StopArgs&) override;
LayerTracing::Mode GetMode() const;
static constexpr auto* kName = "android.surfaceflinger.layers";
static constexpr perfetto::BufferExhaustedPolicy kBufferExhaustedPolicy =
perfetto::BufferExhaustedPolicy::kStall;
static constexpr bool kRequiresCallbacksUnderLock = false;
private:
static std::atomic<LayerTracing*> mLayerTracing;
LayerTracing::Mode mMode;
std::uint32_t mFlags;
};
} // namespace android
PERFETTO_DECLARE_DATA_SOURCE_STATIC_MEMBERS(android::LayerDataSource);
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