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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 <array>
#include <atomic>
#include <memory>
#include <optional>
#include <ui/DisplayId.h>
#include <ui/Fence.h>
#include <ui/FenceTime.h>
#include <scheduler/Features.h>
#include <scheduler/Time.h>
#include <scheduler/VsyncId.h>
#include <scheduler/interface/CompositeResult.h>
// TODO(b/185536303): Pull to FTL.
#include "../../../TracedOrdinal.h"
#include "../../../Utils/Dumper.h"
namespace android::scheduler {
struct IVsyncSource;
// Read-only interface to the metrics computed by FrameTargeter for the latest frame.
class FrameTarget {
public:
VsyncId vsyncId() const { return mVsyncId; }
// The time when the frame actually began, as opposed to when it had been scheduled to begin.
TimePoint frameBeginTime() const { return mFrameBeginTime; }
// Relative to when the frame actually began, as opposed to when it had been scheduled to begin.
Duration expectedFrameDuration() const { return mExpectedPresentTime - mFrameBeginTime; }
TimePoint expectedPresentTime() const { return mExpectedPresentTime; }
std::optional<TimePoint> earliestPresentTime() const { return mEarliestPresentTime; }
// The time of the VSYNC that preceded this frame. See `presentFenceForPastVsync` for details.
TimePoint pastVsyncTime(Period minFramePeriod) const;
// The present fence for the frame that had targeted the most recent VSYNC before this frame.
// If the target VSYNC for any given frame is more than `vsyncPeriod` in the future, then the
// VSYNC of at least one previous frame has not yet passed. In other words, this is NOT the
// `presentFenceForPreviousFrame` if running N VSYNCs ahead, but the one that should have been
// signaled by now (unless that frame missed).
const FenceTimePtr& presentFenceForPastVsync(Period minFramePeriod) const;
// Equivalent to `presentFenceForPastVsync` unless running N VSYNCs ahead.
const FenceTimePtr& presentFenceForPreviousFrame() const {
return mPresentFences.front().fenceTime;
}
bool isFramePending() const { return mFramePending; }
bool didMissFrame() const { return mFrameMissed; }
bool didMissHwcFrame() const { return mHwcFrameMissed && !mGpuFrameMissed; }
protected:
explicit FrameTarget(const std::string& displayLabel);
~FrameTarget() = default;
bool wouldPresentEarly(Period minFramePeriod) const;
// Equivalent to `pastVsyncTime` unless running N VSYNCs ahead.
TimePoint previousFrameVsyncTime(Period minFramePeriod) const {
return mExpectedPresentTime - minFramePeriod;
}
VsyncId mVsyncId;
TimePoint mFrameBeginTime;
TimePoint mExpectedPresentTime;
std::optional<TimePoint> mEarliestPresentTime;
TracedOrdinal<bool> mFramePending;
TracedOrdinal<bool> mFrameMissed;
TracedOrdinal<bool> mHwcFrameMissed;
TracedOrdinal<bool> mGpuFrameMissed;
struct FenceWithFenceTime {
sp<Fence> fence = Fence::NO_FENCE;
FenceTimePtr fenceTime = FenceTime::NO_FENCE;
};
std::array<FenceWithFenceTime, 2> mPresentFences;
private:
friend class FrameTargeterTestBase;
template <int N>
inline bool targetsVsyncsAhead(Period minFramePeriod) const {
static_assert(N > 1);
return expectedFrameDuration() > (N - 1) * minFramePeriod;
}
};
// Computes a display's per-frame metrics about past/upcoming targeting of present deadlines.
class FrameTargeter final : private FrameTarget {
public:
FrameTargeter(PhysicalDisplayId displayId, FeatureFlags flags)
: FrameTarget(to_string(displayId)),
mBackpressureGpuComposition(flags.test(Feature::kBackpressureGpuComposition)),
mSupportsExpectedPresentTime(flags.test(Feature::kExpectedPresentTime)) {}
const FrameTarget& target() const { return *this; }
struct BeginFrameArgs {
TimePoint frameBeginTime;
VsyncId vsyncId;
TimePoint expectedVsyncTime;
Duration sfWorkDuration;
Duration hwcMinWorkDuration;
};
void beginFrame(const BeginFrameArgs&, const IVsyncSource&);
std::optional<TimePoint> computeEarliestPresentTime(Period minFramePeriod,
Duration hwcMinWorkDuration);
// TODO(b/241285191): Merge with FrameTargeter::endFrame.
FenceTimePtr setPresentFence(sp<Fence>);
void endFrame(const CompositeResult&);
void dump(utils::Dumper&) const;
private:
friend class FrameTargeterTestBase;
// For tests.
using IsFencePendingFuncPtr = bool (*)(const FenceTimePtr&, int graceTimeMs);
void beginFrame(const BeginFrameArgs&, const IVsyncSource&, IsFencePendingFuncPtr);
FenceTimePtr setPresentFence(sp<Fence>, FenceTimePtr);
static bool isFencePending(const FenceTimePtr&, int graceTimeMs);
const bool mBackpressureGpuComposition;
const bool mSupportsExpectedPresentTime;
TimePoint mScheduledPresentTime;
CompositionCoverageFlags mCompositionCoverage;
std::atomic_uint mFrameMissedCount = 0;
std::atomic_uint mHwcFrameMissedCount = 0;
std::atomic_uint mGpuFrameMissedCount = 0;
};
} // namespace android::scheduler
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