services/surfaceflinger/Scheduler/Scheduler.h - android_frameworks_native - Gitiles

 /*
  * Copyright 2018 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 <atomic>
 #include <functional>
 #include <memory>
 #include <mutex>
 #include <optional>
 #include <unordered_map>

 // TODO(b/129481165): remove the #pragma below and fix conversion issues
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wconversion"
 #pragma clang diagnostic ignored "-Wextra"
 #include <ui/GraphicTypes.h>
 #pragma clang diagnostic pop // ignored "-Wconversion -Wextra"

 #include "EventThread.h"
 #include "LayerHistory.h"
 #include "OneShotTimer.h"
 #include "RefreshRateConfigs.h"
 #include "SchedulerUtils.h"

 namespace android {

 using namespace std::chrono_literals;
 using scheduler::LayerHistory;

 class FenceTime;
 class InjectVSyncSource;
 class PredictedVsyncTracer;

 namespace scheduler {
 class VsyncController;
 class VSyncDispatch;
 class VSyncTracker;
 } // namespace scheduler

 namespace frametimeline {
 class TokenManager;
 } // namespace frametimeline

 struct ISchedulerCallback {
     virtual void setVsyncEnabled(bool) = 0;
     virtual void changeRefreshRate(const scheduler::RefreshRateConfigs::RefreshRate&,
                                    scheduler::RefreshRateConfigEvent) = 0;
     virtual void repaintEverythingForHWC() = 0;
     virtual void kernelTimerChanged(bool expired) = 0;
     virtual void triggerOnFrameRateOverridesChanged() = 0;

 protected:
     ~ISchedulerCallback() = default;
 };

 class Scheduler {
 public:
     using RefreshRate = scheduler::RefreshRateConfigs::RefreshRate;
     using ModeEvent = scheduler::RefreshRateConfigEvent;

     Scheduler(const scheduler::RefreshRateConfigs&, ISchedulerCallback&);
     ~Scheduler();

     using ConnectionHandle = scheduler::ConnectionHandle;
     ConnectionHandle createConnection(const char* connectionName, frametimeline::TokenManager*,
                                       std::chrono::nanoseconds workDuration,
                                       std::chrono::nanoseconds readyDuration,
                                       impl::EventThread::InterceptVSyncsCallback);

     sp<IDisplayEventConnection> createDisplayEventConnection(
             ConnectionHandle, ISurfaceComposer::EventRegistrationFlags eventRegistration = {});

     sp<EventThreadConnection> getEventConnection(ConnectionHandle);

     void onHotplugReceived(ConnectionHandle, PhysicalDisplayId, bool connected);
     void onPrimaryDisplayModeChanged(ConnectionHandle, PhysicalDisplayId, DisplayModeId,
                                      nsecs_t vsyncPeriod) EXCLUDES(mFeatureStateLock);
     void onNonPrimaryDisplayModeChanged(ConnectionHandle, PhysicalDisplayId, DisplayModeId,
                                         nsecs_t vsyncPeriod);
     void onScreenAcquired(ConnectionHandle);
     void onScreenReleased(ConnectionHandle);

     void onFrameRateOverridesChanged(ConnectionHandle, PhysicalDisplayId)
             EXCLUDES(mFrameRateOverridesMutex) EXCLUDES(mConnectionsLock);

     // Modifies work duration in the event thread.
     void setDuration(ConnectionHandle, std::chrono::nanoseconds workDuration,
                      std::chrono::nanoseconds readyDuration);

     DisplayStatInfo getDisplayStatInfo(nsecs_t now);

     // Returns injector handle if injection has toggled, or an invalid handle otherwise.
     ConnectionHandle enableVSyncInjection(bool enable);
     // Returns false if injection is disabled.
     bool injectVSync(nsecs_t when, nsecs_t expectedVSyncTime, nsecs_t deadlineTimestamp);
     void enableHardwareVsync();
     void disableHardwareVsync(bool makeUnavailable);

     // Resyncs the scheduler to hardware vsync.
     // If makeAvailable is true, then hardware vsync will be turned on.
     // Otherwise, if hardware vsync is not already enabled then this method will
     // no-op.
     // The period is the vsync period from the current display configuration.
     void resyncToHardwareVsync(bool makeAvailable, nsecs_t period);
     void resync();

     // Passes a vsync sample to VsyncController. periodFlushed will be true if
     // VsyncController detected that the vsync period changed, and false otherwise.
     void addResyncSample(nsecs_t timestamp, std::optional<nsecs_t> hwcVsyncPeriod,
                          bool* periodFlushed);
     void addPresentFence(const std::shared_ptr<FenceTime>&);
     void setIgnorePresentFences(bool ignore);

     // Layers are registered on creation, and unregistered when the weak reference expires.
     void registerLayer(Layer*);
     void recordLayerHistory(Layer*, nsecs_t presentTime, LayerHistory::LayerUpdateType updateType);
     void setModeChangePending(bool pending);

     // Detects content using layer history, and selects a matching refresh rate.
     void chooseRefreshRateForContent();

     bool isIdleTimerEnabled() const { return mIdleTimer.has_value(); }
     void resetIdleTimer();

     // Function that resets the touch timer.
     void notifyTouchEvent();

     void setDisplayPowerState(bool normal);

     scheduler::VSyncDispatch& getVsyncDispatch() { return *mVsyncSchedule.dispatch; }

     // Returns true if a given vsync timestamp is considered valid vsync
     // for a given uid
     bool isVsyncValid(nsecs_t expectedVsyncTimestamp, uid_t uid) const
             EXCLUDES(mFrameRateOverridesMutex);

     void dump(std::string&) const;
     void dump(ConnectionHandle, std::string&) const;
     void dumpVsync(std::string&) const;

     // Get the appropriate refresh for current conditions.
     std::optional<DisplayModeId> getPreferredModeId();

     // Notifies the scheduler about a refresh rate timeline change.
     void onNewVsyncPeriodChangeTimeline(const hal::VsyncPeriodChangeTimeline& timeline);

     // Notifies the scheduler when the display was refreshed
     void onDisplayRefreshed(nsecs_t timestamp);

     // Notifies the scheduler when the display size has changed. Called from SF's main thread
     void onPrimaryDisplayAreaChanged(uint32_t displayArea);

     size_t getEventThreadConnectionCount(ConnectionHandle handle);

     std::unique_ptr<VSyncSource> makePrimaryDispSyncSource(const char* name,
                                                            std::chrono::nanoseconds workDuration,
                                                            std::chrono::nanoseconds readyDuration,
                                                            bool traceVsync = true);

     // Stores the preferred refresh rate that an app should run at.
     // FrameRateOverride.refreshRateHz == 0 means no preference.
     void setPreferredRefreshRateForUid(FrameRateOverride) EXCLUDES(mFrameRateOverridesMutex);
     // Retrieves the overridden refresh rate for a given uid.
     std::optional<Fps> getFrameRateOverride(uid_t uid) const EXCLUDES(mFrameRateOverridesMutex);

 private:
     friend class TestableScheduler;

     // In order to make sure that the features don't override themselves, we need a state machine
     // to keep track which feature requested the config change.
     enum class ContentDetectionState { Off, On };
     enum class TimerState { Reset, Expired };
     enum class TouchState { Inactive, Active };

     struct Options {
         // Whether to use idle timer callbacks that support the kernel timer.
         bool supportKernelTimer;
         // Whether to use content detection at all.
         bool useContentDetection;
     };

     struct VsyncSchedule {
         std::unique_ptr<scheduler::VsyncController> controller;
         std::unique_ptr<scheduler::VSyncTracker> tracker;
         std::unique_ptr<scheduler::VSyncDispatch> dispatch;
     };

     // Unlike the testing constructor, this creates the VsyncSchedule, LayerHistory, and timers.
     Scheduler(const scheduler::RefreshRateConfigs&, ISchedulerCallback&, Options);

     // Used by tests to inject mocks.
     Scheduler(VsyncSchedule, const scheduler::RefreshRateConfigs&, ISchedulerCallback&,
               std::unique_ptr<LayerHistory>, Options);

     static VsyncSchedule createVsyncSchedule(bool supportKernelIdleTimer);
     static std::unique_ptr<LayerHistory> createLayerHistory(const scheduler::RefreshRateConfigs&);

     // Create a connection on the given EventThread.
     ConnectionHandle createConnection(std::unique_ptr<EventThread>);
     sp<EventThreadConnection> createConnectionInternal(
             EventThread*, ISurfaceComposer::EventRegistrationFlags eventRegistration = {});

     // Update feature state machine to given state when corresponding timer resets or expires.
     void kernelIdleTimerCallback(TimerState);
     void idleTimerCallback(TimerState);
     void touchTimerCallback(TimerState);
     void displayPowerTimerCallback(TimerState);

     // handles various timer features to change the refresh rate.
     template <class T>
     bool handleTimerStateChanged(T* currentState, T newState);

     void setVsyncPeriod(nsecs_t period);

     // This function checks whether individual features that are affecting the refresh rate
     // selection were initialized, prioritizes them, and calculates the DisplayModeId
     // for the suggested refresh rate.
     DisplayModeId calculateRefreshRateModeId(
             scheduler::RefreshRateConfigs::GlobalSignals* consideredSignals = nullptr)
             REQUIRES(mFeatureStateLock);

     void dispatchCachedReportedMode() REQUIRES(mFeatureStateLock);
     bool updateFrameRateOverrides(scheduler::RefreshRateConfigs::GlobalSignals consideredSignals,
                                   Fps displayRefreshRate) REQUIRES(mFeatureStateLock)
             EXCLUDES(mFrameRateOverridesMutex);

     impl::EventThread::ThrottleVsyncCallback makeThrottleVsyncCallback() const;

     // Stores EventThread associated with a given VSyncSource, and an initial EventThreadConnection.
     struct Connection {
         sp<EventThreadConnection> connection;
         std::unique_ptr<EventThread> thread;
     };

     ConnectionHandle::Id mNextConnectionHandleId = 0;
     mutable std::mutex mConnectionsLock;
     std::unordered_map<ConnectionHandle, Connection> mConnections GUARDED_BY(mConnectionsLock);

     bool mInjectVSyncs = false;
     InjectVSyncSource* mVSyncInjector = nullptr;
     ConnectionHandle mInjectorConnectionHandle;

     std::mutex mHWVsyncLock;
     bool mPrimaryHWVsyncEnabled GUARDED_BY(mHWVsyncLock) = false;
     bool mHWVsyncAvailable GUARDED_BY(mHWVsyncLock) = false;

     std::atomic<nsecs_t> mLastResyncTime = 0;

     const Options mOptions;
     VsyncSchedule mVsyncSchedule;

     // Used to choose refresh rate if content detection is enabled.
     const std::unique_ptr<LayerHistory> mLayerHistory;

     // Timer that records time between requests for next vsync.
     std::optional<scheduler::OneShotTimer> mIdleTimer;
     // Timer used to monitor touch events.
     std::optional<scheduler::OneShotTimer> mTouchTimer;
     // Timer used to monitor display power mode.
     std::optional<scheduler::OneShotTimer> mDisplayPowerTimer;

     ISchedulerCallback& mSchedulerCallback;

     // In order to make sure that the features don't override themselves, we need a state machine
     // to keep track which feature requested the config change.
     mutable std::mutex mFeatureStateLock;

     struct {
         TimerState idleTimer = TimerState::Reset;
         TouchState touch = TouchState::Inactive;
         TimerState displayPowerTimer = TimerState::Expired;

         std::optional<DisplayModeId> modeId;
         LayerHistory::Summary contentRequirements;

         bool isDisplayPowerStateNormal = true;

         // Used to cache the last parameters of onPrimaryDisplayModeChanged
         struct ModeChangedParams {
             ConnectionHandle handle;
             PhysicalDisplayId displayId;
             DisplayModeId modeId;
             nsecs_t vsyncPeriod;
         };

         std::optional<ModeChangedParams> cachedModeChangedParams;
     } mFeatures GUARDED_BY(mFeatureStateLock);

     const scheduler::RefreshRateConfigs& mRefreshRateConfigs;

     std::mutex mVsyncTimelineLock;
     std::optional<hal::VsyncPeriodChangeTimeline> mLastVsyncPeriodChangeTimeline
             GUARDED_BY(mVsyncTimelineLock);
     static constexpr std::chrono::nanoseconds MAX_VSYNC_APPLIED_TIME = 200ms;

     const std::unique_ptr<PredictedVsyncTracer> mPredictedVsyncTracer;

     // The frame rate override lists need their own mutex as they are being read
     // by SurfaceFlinger, Scheduler and EventThread (as a callback) to prevent deadlocks
     mutable std::mutex mFrameRateOverridesMutex;

     // mappings between a UID and a preferred refresh rate that this app would
     // run at.
     scheduler::RefreshRateConfigs::UidToFrameRateOverride mFrameRateOverridesByContent
             GUARDED_BY(mFrameRateOverridesMutex);
     scheduler::RefreshRateConfigs::UidToFrameRateOverride mFrameRateOverridesFromBackdoor
             GUARDED_BY(mFrameRateOverridesMutex);
 };

 } // namespace android
	/*
	* Copyright 2018 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 <atomic>
	#include <functional>
	#include <memory>
	#include <mutex>
	#include <optional>
	#include <unordered_map>

	// TODO(b/129481165): remove the #pragma below and fix conversion issues
	#pragma clang diagnostic push
	#pragma clang diagnostic ignored "-Wconversion"
	#pragma clang diagnostic ignored "-Wextra"
	#include <ui/GraphicTypes.h>
	#pragma clang diagnostic pop // ignored "-Wconversion -Wextra"

	#include "EventThread.h"
	#include "LayerHistory.h"
	#include "OneShotTimer.h"
	#include "RefreshRateConfigs.h"
	#include "SchedulerUtils.h"

	namespace android {

	using namespace std::chrono_literals;
	using scheduler::LayerHistory;

	class FenceTime;
	class InjectVSyncSource;
	class PredictedVsyncTracer;

	namespace scheduler {
	class VsyncController;
	class VSyncDispatch;
	class VSyncTracker;
	} // namespace scheduler

	namespace frametimeline {
	class TokenManager;
	} // namespace frametimeline

	struct ISchedulerCallback {
	virtual void setVsyncEnabled(bool) = 0;
	virtual void changeRefreshRate(const scheduler::RefreshRateConfigs::RefreshRate&,
	scheduler::RefreshRateConfigEvent) = 0;
	virtual void repaintEverythingForHWC() = 0;
	virtual void kernelTimerChanged(bool expired) = 0;
	virtual void triggerOnFrameRateOverridesChanged() = 0;

	protected:
	~ISchedulerCallback() = default;
	};

	class Scheduler {
	public:
	using RefreshRate = scheduler::RefreshRateConfigs::RefreshRate;
	using ModeEvent = scheduler::RefreshRateConfigEvent;

	Scheduler(const scheduler::RefreshRateConfigs&, ISchedulerCallback&);
	~Scheduler();

	using ConnectionHandle = scheduler::ConnectionHandle;
	ConnectionHandle createConnection(const char* connectionName, frametimeline::TokenManager*,
	std::chrono::nanoseconds workDuration,
	std::chrono::nanoseconds readyDuration,
	impl::EventThread::InterceptVSyncsCallback);

	sp<IDisplayEventConnection> createDisplayEventConnection(
	ConnectionHandle, ISurfaceComposer::EventRegistrationFlags eventRegistration = {});

	sp<EventThreadConnection> getEventConnection(ConnectionHandle);

	void onHotplugReceived(ConnectionHandle, PhysicalDisplayId, bool connected);
	void onPrimaryDisplayModeChanged(ConnectionHandle, PhysicalDisplayId, DisplayModeId,
	nsecs_t vsyncPeriod) EXCLUDES(mFeatureStateLock);
	void onNonPrimaryDisplayModeChanged(ConnectionHandle, PhysicalDisplayId, DisplayModeId,
	nsecs_t vsyncPeriod);
	void onScreenAcquired(ConnectionHandle);
	void onScreenReleased(ConnectionHandle);

	void onFrameRateOverridesChanged(ConnectionHandle, PhysicalDisplayId)
	EXCLUDES(mFrameRateOverridesMutex) EXCLUDES(mConnectionsLock);

	// Modifies work duration in the event thread.
	void setDuration(ConnectionHandle, std::chrono::nanoseconds workDuration,
	std::chrono::nanoseconds readyDuration);

	DisplayStatInfo getDisplayStatInfo(nsecs_t now);

	// Returns injector handle if injection has toggled, or an invalid handle otherwise.
	ConnectionHandle enableVSyncInjection(bool enable);
	// Returns false if injection is disabled.
	bool injectVSync(nsecs_t when, nsecs_t expectedVSyncTime, nsecs_t deadlineTimestamp);
	void enableHardwareVsync();
	void disableHardwareVsync(bool makeUnavailable);

	// Resyncs the scheduler to hardware vsync.
	// If makeAvailable is true, then hardware vsync will be turned on.
	// Otherwise, if hardware vsync is not already enabled then this method will
	// no-op.
	// The period is the vsync period from the current display configuration.
	void resyncToHardwareVsync(bool makeAvailable, nsecs_t period);
	void resync();

	// Passes a vsync sample to VsyncController. periodFlushed will be true if
	// VsyncController detected that the vsync period changed, and false otherwise.
	void addResyncSample(nsecs_t timestamp, std::optional<nsecs_t> hwcVsyncPeriod,
	bool* periodFlushed);
	void addPresentFence(const std::shared_ptr<FenceTime>&);
	void setIgnorePresentFences(bool ignore);

	// Layers are registered on creation, and unregistered when the weak reference expires.
	void registerLayer(Layer*);
	void recordLayerHistory(Layer*, nsecs_t presentTime, LayerHistory::LayerUpdateType updateType);
	void setModeChangePending(bool pending);

	// Detects content using layer history, and selects a matching refresh rate.
	void chooseRefreshRateForContent();

	bool isIdleTimerEnabled() const { return mIdleTimer.has_value(); }
	void resetIdleTimer();

	// Function that resets the touch timer.
	void notifyTouchEvent();

	void setDisplayPowerState(bool normal);

	scheduler::VSyncDispatch& getVsyncDispatch() { return *mVsyncSchedule.dispatch; }

	// Returns true if a given vsync timestamp is considered valid vsync
	// for a given uid
	bool isVsyncValid(nsecs_t expectedVsyncTimestamp, uid_t uid) const
	EXCLUDES(mFrameRateOverridesMutex);

	void dump(std::string&) const;
	void dump(ConnectionHandle, std::string&) const;
	void dumpVsync(std::string&) const;

	// Get the appropriate refresh for current conditions.
	std::optional<DisplayModeId> getPreferredModeId();

	// Notifies the scheduler about a refresh rate timeline change.
	void onNewVsyncPeriodChangeTimeline(const hal::VsyncPeriodChangeTimeline& timeline);

	// Notifies the scheduler when the display was refreshed
	void onDisplayRefreshed(nsecs_t timestamp);

	// Notifies the scheduler when the display size has changed. Called from SF's main thread
	void onPrimaryDisplayAreaChanged(uint32_t displayArea);

	size_t getEventThreadConnectionCount(ConnectionHandle handle);

	std::unique_ptr<VSyncSource> makePrimaryDispSyncSource(const char* name,
	std::chrono::nanoseconds workDuration,
	std::chrono::nanoseconds readyDuration,
	bool traceVsync = true);

	// Stores the preferred refresh rate that an app should run at.
	// FrameRateOverride.refreshRateHz == 0 means no preference.
	void setPreferredRefreshRateForUid(FrameRateOverride) EXCLUDES(mFrameRateOverridesMutex);
	// Retrieves the overridden refresh rate for a given uid.
	std::optional<Fps> getFrameRateOverride(uid_t uid) const EXCLUDES(mFrameRateOverridesMutex);

	private:
	friend class TestableScheduler;

	// In order to make sure that the features don't override themselves, we need a state machine
	// to keep track which feature requested the config change.
	enum class ContentDetectionState { Off, On };
	enum class TimerState { Reset, Expired };
	enum class TouchState { Inactive, Active };

	struct Options {
	// Whether to use idle timer callbacks that support the kernel timer.
	bool supportKernelTimer;
	// Whether to use content detection at all.
	bool useContentDetection;
	};

	struct VsyncSchedule {
	std::unique_ptr<scheduler::VsyncController> controller;
	std::unique_ptr<scheduler::VSyncTracker> tracker;
	std::unique_ptr<scheduler::VSyncDispatch> dispatch;
	};

	// Unlike the testing constructor, this creates the VsyncSchedule, LayerHistory, and timers.
	Scheduler(const scheduler::RefreshRateConfigs&, ISchedulerCallback&, Options);

	// Used by tests to inject mocks.
	Scheduler(VsyncSchedule, const scheduler::RefreshRateConfigs&, ISchedulerCallback&,
	std::unique_ptr<LayerHistory>, Options);

	static VsyncSchedule createVsyncSchedule(bool supportKernelIdleTimer);
	static std::unique_ptr<LayerHistory> createLayerHistory(const scheduler::RefreshRateConfigs&);

	// Create a connection on the given EventThread.
	ConnectionHandle createConnection(std::unique_ptr<EventThread>);
	sp<EventThreadConnection> createConnectionInternal(
	EventThread*, ISurfaceComposer::EventRegistrationFlags eventRegistration = {});

	// Update feature state machine to given state when corresponding timer resets or expires.
	void kernelIdleTimerCallback(TimerState);
	void idleTimerCallback(TimerState);
	void touchTimerCallback(TimerState);
	void displayPowerTimerCallback(TimerState);

	// handles various timer features to change the refresh rate.
	template <class T>
	bool handleTimerStateChanged(T* currentState, T newState);

	void setVsyncPeriod(nsecs_t period);

	// This function checks whether individual features that are affecting the refresh rate
	// selection were initialized, prioritizes them, and calculates the DisplayModeId
	// for the suggested refresh rate.
	DisplayModeId calculateRefreshRateModeId(
	scheduler::RefreshRateConfigs::GlobalSignals* consideredSignals = nullptr)
	REQUIRES(mFeatureStateLock);

	void dispatchCachedReportedMode() REQUIRES(mFeatureStateLock);
	bool updateFrameRateOverrides(scheduler::RefreshRateConfigs::GlobalSignals consideredSignals,
	Fps displayRefreshRate) REQUIRES(mFeatureStateLock)
	EXCLUDES(mFrameRateOverridesMutex);

	impl::EventThread::ThrottleVsyncCallback makeThrottleVsyncCallback() const;

	// Stores EventThread associated with a given VSyncSource, and an initial EventThreadConnection.
	struct Connection {
	sp<EventThreadConnection> connection;
	std::unique_ptr<EventThread> thread;
	};

	ConnectionHandle::Id mNextConnectionHandleId = 0;
	mutable std::mutex mConnectionsLock;
	std::unordered_map<ConnectionHandle, Connection> mConnections GUARDED_BY(mConnectionsLock);

	bool mInjectVSyncs = false;
	InjectVSyncSource* mVSyncInjector = nullptr;
	ConnectionHandle mInjectorConnectionHandle;

	std::mutex mHWVsyncLock;
	bool mPrimaryHWVsyncEnabled GUARDED_BY(mHWVsyncLock) = false;
	bool mHWVsyncAvailable GUARDED_BY(mHWVsyncLock) = false;

	std::atomic<nsecs_t> mLastResyncTime = 0;

	const Options mOptions;
	VsyncSchedule mVsyncSchedule;

	// Used to choose refresh rate if content detection is enabled.
	const std::unique_ptr<LayerHistory> mLayerHistory;

	// Timer that records time between requests for next vsync.
	std::optional<scheduler::OneShotTimer> mIdleTimer;
	// Timer used to monitor touch events.
	std::optional<scheduler::OneShotTimer> mTouchTimer;
	// Timer used to monitor display power mode.
	std::optional<scheduler::OneShotTimer> mDisplayPowerTimer;

	ISchedulerCallback& mSchedulerCallback;

	// In order to make sure that the features don't override themselves, we need a state machine
	// to keep track which feature requested the config change.
	mutable std::mutex mFeatureStateLock;

	struct {
	TimerState idleTimer = TimerState::Reset;
	TouchState touch = TouchState::Inactive;
	TimerState displayPowerTimer = TimerState::Expired;

	std::optional<DisplayModeId> modeId;
	LayerHistory::Summary contentRequirements;

	bool isDisplayPowerStateNormal = true;

	// Used to cache the last parameters of onPrimaryDisplayModeChanged
	struct ModeChangedParams {
	ConnectionHandle handle;
	PhysicalDisplayId displayId;
	DisplayModeId modeId;
	nsecs_t vsyncPeriod;
	};

	std::optional<ModeChangedParams> cachedModeChangedParams;
	} mFeatures GUARDED_BY(mFeatureStateLock);

	const scheduler::RefreshRateConfigs& mRefreshRateConfigs;

	std::mutex mVsyncTimelineLock;
	std::optional<hal::VsyncPeriodChangeTimeline> mLastVsyncPeriodChangeTimeline
	GUARDED_BY(mVsyncTimelineLock);
	static constexpr std::chrono::nanoseconds MAX_VSYNC_APPLIED_TIME = 200ms;

	const std::unique_ptr<PredictedVsyncTracer> mPredictedVsyncTracer;

	// The frame rate override lists need their own mutex as they are being read
	// by SurfaceFlinger, Scheduler and EventThread (as a callback) to prevent deadlocks
	mutable std::mutex mFrameRateOverridesMutex;

	// mappings between a UID and a preferred refresh rate that this app would
	// run at.
	scheduler::RefreshRateConfigs::UidToFrameRateOverride mFrameRateOverridesByContent
	GUARDED_BY(mFrameRateOverridesMutex);
	scheduler::RefreshRateConfigs::UidToFrameRateOverride mFrameRateOverridesFromBackdoor
	GUARDED_BY(mFrameRateOverridesMutex);
	};

	} // namespace android