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Commit 24416fa5 authored by TreeHugger Robot's avatar TreeHugger Robot Committed by Android (Google) Code Review
Browse files

Merge "Send power hints from surfaceflinger using the PowerAdvisor"

parents 5f0ef012 ef51fbaf

libs/renderengine/include/renderengine/RenderEngine.h

+4 −0
Original line number Diff line number Diff line
@@ -189,6 +189,10 @@ public: 
    static void validateInputBufferUsage(const sp<GraphicBuffer>&);

    static void validateOutputBufferUsage(const sp<GraphicBuffer>&);



    // Allows flinger to get the render engine thread id for power management with ADPF

    // Returns the tid of the renderengine thread if it's threaded, and std::nullopt otherwise

    virtual std::optional<pid_t> getRenderEngineTid() const { return std::nullopt; }



protected:

    RenderEngine() : RenderEngine(RenderEngineType::GLES) {}

libs/renderengine/threaded/RenderEngineThreaded.cpp

+14 −0
Original line number Diff line number Diff line
@@ -389,6 +389,20 @@ void RenderEngineThreaded::onActiveDisplaySizeChanged(ui::Size size) { 
    mCondition.notify_one();

}



std::optional<pid_t> RenderEngineThreaded::getRenderEngineTid() const {

    std::promise<pid_t> tidPromise;

    std::future<pid_t> tidFuture = tidPromise.get_future();

    {

        std::lock_guard lock(mThreadMutex);

        mFunctionCalls.push([&tidPromise](renderengine::RenderEngine& instance) {

            tidPromise.set_value(gettid());

        });

    }



    mCondition.notify_one();

    return std::make_optional(tidFuture.get());

}



} // namespace threaded

} // namespace renderengine

} // namespace android

libs/renderengine/threaded/RenderEngineThreaded.h

+1 −0
Original line number Diff line number Diff line
@@ -66,6 +66,7 @@ public: 
    int getContextPriority() override;

    bool supportsBackgroundBlur() override;

    void onActiveDisplaySizeChanged(ui::Size size) override;

    std::optional<pid_t> getRenderEngineTid() const override;



protected:

    void mapExternalTextureBuffer(const sp<GraphicBuffer>& buffer, bool isRenderable) override;

services/surfaceflinger/CompositionEngine/tests/MockPowerAdvisor.h

+1 −2
Original line number Diff line number Diff line
@@ -39,11 +39,10 @@ public: 
    MOCK_METHOD(bool, supportsPowerHintSession, (), (override));

    MOCK_METHOD(bool, isPowerHintSessionRunning, (), (override));

    MOCK_METHOD(void, setTargetWorkDuration, (int64_t targetDurationNanos), (override));

    MOCK_METHOD(void, setPowerHintSessionThreadIds, (const std::vector<int32_t>& threadIds),

                (override));

    MOCK_METHOD(void, sendActualWorkDuration, (int64_t actualDurationNanos, nsecs_t timestamp),

                (override));

    MOCK_METHOD(void, enablePowerHint, (bool enabled), (override));

    MOCK_METHOD(bool, startPowerHintSession, (const std::vector<int32_t>& threadIds), (override));

};



} // namespace mock

services/surfaceflinger/DisplayHardware/PowerAdvisor.cpp

+107 −70
Original line number Diff line number Diff line
@@ -93,13 +93,6 @@ void PowerAdvisor::init() { 


void PowerAdvisor::onBootFinished() {

    mBootFinished.store(true);

    {

        std::lock_guard lock(mPowerHalMutex);

        HalWrapper* halWrapper = getPowerHal();

        if (halWrapper != nullptr && usePowerHintSession()) {

            mPowerHintSessionRunning = halWrapper->startPowerHintSession();

        }

    }

}



void PowerAdvisor::setExpensiveRenderingExpected(DisplayId displayId, bool expected) {
@@ -156,7 +149,6 @@ void PowerAdvisor::notifyDisplayUpdateImminent() { 
// checks both if it supports and if it's enabled

bool PowerAdvisor::usePowerHintSession() {

    // uses cached value since the underlying support and flag are unlikely to change at runtime

    ALOGE_IF(!mPowerHintEnabled.has_value(), "Power hint session cannot be used before boot!");

    return mPowerHintEnabled.value_or(false) && supportsPowerHintSession();

}
@@ -175,10 +167,7 @@ bool PowerAdvisor::isPowerHintSessionRunning() { 
}



void PowerAdvisor::setTargetWorkDuration(int64_t targetDurationNanos) {

    // we check "supports" here not "usePowerHintSession" because this needs to work

    // before the session is actually running, and "use" will always fail before boot

    // we store the values passed in before boot to start the session with during onBootFinished

    if (!supportsPowerHintSession()) {

    if (!usePowerHintSession()) {

        ALOGV("Power hint session target duration cannot be set, skipping");

        return;

    }
@@ -186,24 +175,7 @@ void PowerAdvisor::setTargetWorkDuration(int64_t targetDurationNanos) { 
        std::lock_guard lock(mPowerHalMutex);

        HalWrapper* const halWrapper = getPowerHal();

        if (halWrapper != nullptr) {

            halWrapper->setTargetWorkDuration(targetDurationNanos);

        }

    }

}



void PowerAdvisor::setPowerHintSessionThreadIds(const std::vector<int32_t>& threadIds) {

    // we check "supports" here not "usePowerHintSession" because this needs to wsork

    // before the session is actually running, and "use" will always fail before boot.

    // we store the values passed in before boot to start the session with during onBootFinished

    if (!supportsPowerHintSession()) {

        ALOGV("Power hint session thread ids cannot be set, skipping");

        return;

    }

    {

        std::lock_guard lock(mPowerHalMutex);

        HalWrapper* const halWrapper = getPowerHal();

        if (halWrapper != nullptr) {

            halWrapper->setPowerHintSessionThreadIds(const_cast<std::vector<int32_t>&>(threadIds));

            halWrapper->setTargetWorkDuration(targetDurationNanos - kTargetSafetyMargin.count());

        }

    }

}
@@ -227,6 +199,21 @@ void PowerAdvisor::enablePowerHint(bool enabled) { 
    mPowerHintEnabled = enabled;

}



bool PowerAdvisor::startPowerHintSession(const std::vector<int32_t>& threadIds) {

    if (!usePowerHintSession()) {

        ALOGI("Power hint session cannot be started, skipping");

    }

    {

        std::lock_guard lock(mPowerHalMutex);

        HalWrapper* halWrapper = getPowerHal();

        if (halWrapper != nullptr && usePowerHintSession()) {

            halWrapper->setPowerHintSessionThreadIds(threadIds);

            mPowerHintSessionRunning = halWrapper->startPowerHintSession();

        }

    }

    return mPowerHintSessionRunning;

}



class HidlPowerHalWrapper : public PowerAdvisor::HalWrapper {

public:

    HidlPowerHalWrapper(sp<V1_3::IPower> powerHal) : mPowerHal(std::move(powerHal)) {}
@@ -307,11 +294,10 @@ public: 
            mHasDisplayUpdateImminent = false;

        }



        // This just gives a number not a binder status, so no .isOk()

        mSupportsPowerHints = mPowerHal->getInterfaceVersion() >= 2;

        mSupportsPowerHint = checkPowerHintSessionSupported();



        if (mSupportsPowerHints) {

            mPowerHintQueue.reserve(MAX_QUEUE_SIZE);

        if (mSupportsPowerHint) {

            mPowerHintQueue.reserve(kMaxQueueSize);

        }

    }
@@ -356,7 +342,14 @@ public: 
    }



    // only version 2+ of the aidl supports power hint sessions, hidl has no support

    bool supportsPowerHintSession() override { return mSupportsPowerHints; }

    bool supportsPowerHintSession() override { return mSupportsPowerHint; }



    bool checkPowerHintSessionSupported() {

        int64_t unused;

        // Try to get preferred rate to determine if hint sessions are supported

        // We check for isOk not EX_UNSUPPORTED_OPERATION to lump other errors

        return mPowerHal->getHintSessionPreferredRate(&unused).isOk();

    }



    bool isPowerHintSessionRunning() override { return mPowerHintSession != nullptr; }
@@ -382,38 +375,43 @@ public: 
    }



    bool startPowerHintSession() override {

        if (mPowerHintSession != nullptr || !mPowerHintTargetDuration.has_value() ||

            mPowerHintThreadIds.empty()) {

        if (mPowerHintSession != nullptr || mPowerHintThreadIds.empty()) {

            ALOGV("Cannot start power hint session, skipping");

            return false;

        }

        auto ret = mPowerHal->createHintSession(getpid(), static_cast<int32_t>(getuid()),

                                                mPowerHintThreadIds, *mPowerHintTargetDuration,

                                                mPowerHintThreadIds, mTargetDuration,

                                                &mPowerHintSession);

        if (!ret.isOk()) {

            ALOGW("Failed to start power hint session with error: %s",

                  ret.exceptionToString(ret.exceptionCode()).c_str());

            // Indicate to the poweradvisor that this wrapper likely needs to be remade

            mShouldReconnectHal = true;

        } else {

            mLastTargetDurationSent = mTargetDuration;

        }

        return isPowerHintSessionRunning();

    }



    bool shouldSetTargetDuration(int64_t targetDurationNanos) {

        if (!mLastTargetDurationSent.has_value()) {

            return true;

        }



        // report if the change in target from our last submission to now exceeds the threshold

        return abs(1.0 -

                   static_cast<double>(*mLastTargetDurationSent) /

                   static_cast<double>(mLastTargetDurationSent) /

                           static_cast<double>(targetDurationNanos)) >=

                ALLOWED_TARGET_DEVIATION_PERCENT;

                kAllowedTargetDeviationPercent;

    }



    void setTargetWorkDuration(int64_t targetDurationNanos) override {

        mPowerHintTargetDuration = targetDurationNanos;

        if (shouldSetTargetDuration(targetDurationNanos) && isPowerHintSessionRunning()) {

        ATRACE_CALL();

        mTargetDuration = targetDurationNanos;

        if (sTraceHintSessionData) ATRACE_INT64("Time target", targetDurationNanos);

        if (!sNormalizeTarget && shouldSetTargetDuration(targetDurationNanos) &&

            isPowerHintSessionRunning()) {

            if (mLastActualDurationSent.has_value()) {

                // update the error term here since we are actually sending an update to powerhal

                if (sTraceHintSessionData)

                    ATRACE_INT64("Target error term",

                                 targetDurationNanos - *mLastActualDurationSent);

            }

            ALOGV("Sending target time: %lld ns", static_cast<long long>(targetDurationNanos));

            mLastTargetDurationSent = targetDurationNanos;

            auto ret = mPowerHintSession->updateTargetWorkDuration(targetDurationNanos);

            if (!ret.isOk()) {
@@ -426,23 +424,27 @@ public: 


    bool shouldReportActualDurationsNow() {

        // report if we have never reported before or have exceeded the max queue size

        if (!mLastMessageReported.has_value() || mPowerHintQueue.size() >= MAX_QUEUE_SIZE) {

        if (!mLastActualDurationSent.has_value() || mPowerHintQueue.size() >= kMaxQueueSize) {

            return true;

        }



        if (!mActualDuration.has_value()) {

            return false;

        }



        // duration of most recent timing

        const double mostRecentActualDuration =

                static_cast<double>(mPowerHintQueue.back().durationNanos);

        const double mostRecentActualDuration = static_cast<double>(*mActualDuration);

        // duration of the last timing actually reported to the powerhal

        const double lastReportedActualDuration =

                static_cast<double>(mLastMessageReported->durationNanos);

        const double lastReportedActualDuration = static_cast<double>(*mLastActualDurationSent);



        // report if the change in duration from then to now exceeds the threshold

        return abs(1.0 - mostRecentActualDuration / lastReportedActualDuration) >=

                ALLOWED_ACTUAL_DEVIATION_PERCENT;

                kAllowedActualDeviationPercent;

    }



    void sendActualWorkDuration(int64_t actualDurationNanos, nsecs_t timeStampNanos) override {

        ATRACE_CALL();



        if (actualDurationNanos < 0 || !isPowerHintSessionRunning()) {

            ALOGV("Failed to send actual work duration, skipping");

            return;
@@ -450,13 +452,31 @@ public: 


        WorkDuration duration;

        duration.durationNanos = actualDurationNanos;

        mActualDuration = actualDurationNanos;



        // normalize the sent values to a pre-set target

        if (sNormalizeTarget) {

            duration.durationNanos += mLastTargetDurationSent - mTargetDuration;

        }

        duration.timeStampNanos = timeStampNanos;

        mPowerHintQueue.push_back(duration);



        long long targetNsec = mTargetDuration;

        long long durationNsec = actualDurationNanos;



        if (sTraceHintSessionData) {

            ATRACE_INT64("Measured duration", durationNsec);

            ATRACE_INT64("Target error term", targetNsec - durationNsec);

        }



        ALOGV("Sending actual work duration of: %lld on target: %lld with error: %lld",

              durationNsec, targetNsec, targetNsec - durationNsec);



        // This rate limiter queues similar duration reports to the powerhal into

        // batches to avoid excessive binder calls. The criteria to send a given batch

        // are outlined in shouldReportActualDurationsNow()

        if (shouldReportActualDurationsNow()) {

            ALOGV("Sending hint update batch");

            auto ret = mPowerHintSession->reportActualWorkDuration(mPowerHintQueue);

            if (!ret.isOk()) {

                ALOGW("Failed to report actual work durations with error: %s",
@@ -464,7 +484,8 @@ public: 
                mShouldReconnectHal = true;

            }

            mPowerHintQueue.clear();

            mLastMessageReported = duration;

            // we save the non-normalized value here to detect % changes

            mLastActualDurationSent = actualDurationNanos;

        }

    }
@@ -472,32 +493,48 @@ public: 


    std::vector<int32_t> getPowerHintSessionThreadIds() override { return mPowerHintThreadIds; }



    std::optional<int64_t> getTargetWorkDuration() override { return mPowerHintTargetDuration; }

    std::optional<int64_t> getTargetWorkDuration() override { return mTargetDuration; }



private:

    // max number of messages allowed in mPowerHintQueue before reporting is forced

    static constexpr int32_t MAX_QUEUE_SIZE = 15;

    // max percent the actual duration can vary without causing a report (eg: 0.1 = 10%)

    static constexpr double ALLOWED_ACTUAL_DEVIATION_PERCENT = 0.1;

    // max percent the target duration can vary without causing a report (eg: 0.05 = 5%)

    static constexpr double ALLOWED_TARGET_DEVIATION_PERCENT = 0.05;



    const sp<IPower> mPowerHal = nullptr;

    bool mHasExpensiveRendering = false;

    bool mHasDisplayUpdateImminent = false;

    bool mShouldReconnectHal = false; // used to indicate an error state and need for reconstruction

    // Used to indicate an error state and need for reconstruction

    bool mShouldReconnectHal = false;

    // This is not thread safe, but is currently protected by mPowerHalMutex so it needs no lock

    sp<IPowerHintSession> mPowerHintSession = nullptr;

    // Queue of actual durations saved to report

    std::vector<WorkDuration> mPowerHintQueue;

    // halwrapper owns these values so we can init when we want and reconnect if broken

    std::optional<int64_t> mPowerHintTargetDuration;

    // The latest un-normalized values we have received for target and actual

    int64_t mTargetDuration = kDefaultTarget;

    std::optional<int64_t> mActualDuration;

    // The list of thread ids, stored so we can restart the session from this class if needed

    std::vector<int32_t> mPowerHintThreadIds;

    // keep track of the last messages sent for rate limiter change detection

    std::optional<WorkDuration> mLastMessageReported;

    std::optional<int64_t> mLastTargetDurationSent;

    bool mSupportsPowerHints;

    bool mSupportsPowerHint;

    // Keep track of the last messages sent for rate limiter change detection

    std::optional<int64_t> mLastActualDurationSent;

    int64_t mLastTargetDurationSent = kDefaultTarget;

    // Whether to normalize all the actual values as error terms relative to a constant target

    // This saves a binder call by not setting the target, and should not affect the pid values

    static const bool sNormalizeTarget;

    // Whether we should emit ATRACE_INT data for hint sessions

    static const bool sTraceHintSessionData;

    // Max number of messages allowed in mPowerHintQueue before reporting is forced

    static constexpr int32_t kMaxQueueSize = 15;

    // Max percent the actual duration can vary without causing a report (eg: 0.1 = 10%)

    static constexpr double kAllowedActualDeviationPercent = 0.1;

    // Max percent the target duration can vary without causing a report (eg: 0.05 = 5%)

    static constexpr double kAllowedTargetDeviationPercent = 0.05;

    // Target used for init and normalization, the actual value does not really matter

    static constexpr int64_t kDefaultTarget = 50000000;

};



const bool AidlPowerHalWrapper::sTraceHintSessionData =

        base::GetBoolProperty(std::string("debug.sf.trace_hint_sessions"), false);



const bool AidlPowerHalWrapper::sNormalizeTarget =

        base::GetBoolProperty(std::string("debug.sf.normalize_hint_session_durations"), true);



PowerAdvisor::HalWrapper* PowerAdvisor::getPowerHal() {

    static std::unique_ptr<HalWrapper> sHalWrapper = nullptr;

    static bool sHasHal = true;