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Commit 708ebfbc authored by Ady Abraham's avatar Ady Abraham
Browse files

SF: add a backdoor to introduce a janky frame to HWC 

Bug: 346503493
Test: adb shell service call SurfaceFlinger 1046 i32 3Test: adb root && adb shell service call SurfaceFlinger 1046 i32 3
Flag: EXEMPT bugfix
Change-Id: Ic4a837ef06aca40a24db9c1121e19e3e1a1e0d80
parent 7a3c56f8

services/surfaceflinger/CompositionEngine/src/Output.cpp

+6 −0
Original line number Diff line number Diff line
@@ -895,6 +895,12 @@ void Output::writeCompositionState(const compositionengine::CompositionRefreshAr 
                                         })) {

        editState().earliestPresentTime = frameTargetPtrOpt->get()->earliestPresentTime();

        editState().expectedPresentTime = frameTargetPtrOpt->get()->expectedPresentTime().ns();

        const auto debugPresentDelay = frameTargetPtrOpt->get()->debugPresentDelay();

        if (debugPresentDelay) {

            SFTRACE_FORMAT_INSTANT("DEBUG delaying presentation by %.2fms",

                                   debugPresentDelay->ns() / 1e6f);

            editState().expectedPresentTime += debugPresentDelay->ns();

        }

    }

    editState().frameInterval = refreshArgs.frameInterval;

    editState().powerCallback = refreshArgs.powerCallback;

services/surfaceflinger/Scheduler/Scheduler.cpp

+5 −1
Original line number Diff line number Diff line
@@ -203,12 +203,16 @@ void Scheduler::run() { 


void Scheduler::onFrameSignal(ICompositor& compositor, VsyncId vsyncId,

                              TimePoint expectedVsyncTime) {

    const auto debugPresentDelay = mDebugPresentDelay.load();

    mDebugPresentDelay.store(std::nullopt);



    const FrameTargeter::BeginFrameArgs beginFrameArgs =

            {.frameBeginTime = SchedulerClock::now(),

             .vsyncId = vsyncId,

             .expectedVsyncTime = expectedVsyncTime,

             .sfWorkDuration = mVsyncModulator->getVsyncConfig().sfWorkDuration,

             .hwcMinWorkDuration = mVsyncConfiguration->getCurrentConfigs().hwcMinWorkDuration};

             .hwcMinWorkDuration = mVsyncConfiguration->getCurrentConfigs().hwcMinWorkDuration,

             .debugPresentTimeDelay = debugPresentDelay};



    ftl::NonNull<const Display*> pacesetterPtr = pacesetterPtrLocked();

    pacesetterPtr->targeterPtr->beginFrame(beginFrameArgs, *pacesetterPtr->schedulePtr);

services/surfaceflinger/Scheduler/Scheduler.h

+4 −0
Original line number Diff line number Diff line
@@ -337,6 +337,8 @@ public: 
    // recovery should begin.

    void addBufferStuffedUids(BufferStuffingMap bufferStuffedUids);



    void setDebugPresentDelay(TimePoint delay) { mDebugPresentDelay = delay; }



private:

    friend class TestableScheduler;
@@ -602,6 +604,8 @@ private: 


    FrameRateOverrideMappings mFrameRateOverrideMappings;

    SmallAreaDetectionAllowMappings mSmallAreaDetectionAllowMappings;



    std::atomic<std::optional<TimePoint>> mDebugPresentDelay;

};



} // namespace scheduler

services/surfaceflinger/Scheduler/include/scheduler/FrameTargeter.h

+4 −0
Original line number Diff line number Diff line
@@ -53,6 +53,8 @@ public: 


    TimePoint expectedPresentTime() const { return mExpectedPresentTime; }



    std::optional<TimePoint> debugPresentDelay() const { return mDebugPresentTimeDelay; }



    std::optional<TimePoint> earliestPresentTime() const { return mEarliestPresentTime; }



    // Equivalent to `expectedSignaledPresentFence` unless running N VSYNCs ahead.
@@ -84,6 +86,7 @@ protected: 
    TimePoint mFrameBeginTime;

    TimePoint mExpectedPresentTime;

    std::optional<TimePoint> mEarliestPresentTime;

    std::optional<TimePoint> mDebugPresentTimeDelay;



    TracedOrdinal<bool> mFramePending;

    TracedOrdinal<bool> mFrameMissed;
@@ -135,6 +138,7 @@ public: 
        TimePoint expectedVsyncTime;

        Duration sfWorkDuration;

        Duration hwcMinWorkDuration;

        std::optional<TimePoint> debugPresentTimeDelay; // used to introduce jank for testing

    };



    void beginFrame(const BeginFrameArgs&, const IVsyncSource&);

services/surfaceflinger/Scheduler/src/FrameTargeter.cpp

+1 −0
Original line number Diff line number Diff line
@@ -86,6 +86,7 @@ void FrameTargeter::beginFrame(const BeginFrameArgs& args, const IVsyncSource& v 
                               IsFencePendingFuncPtr isFencePendingFuncPtr) {

    mVsyncId = args.vsyncId;

    mFrameBeginTime = args.frameBeginTime;

    mDebugPresentTimeDelay = args.debugPresentTimeDelay;



    // The `expectedVsyncTime`, which was predicted when this frame was scheduled, is normally in

    // the future relative to `frameBeginTime`, but may not be for delayed frames. Adjust