| /* |
| * Copyright (C) 2013 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. |
| */ |
| |
| // TODO(b/129481165): remove the #pragma below and fix conversion issues |
| #pragma clang diagnostic push |
| #pragma clang diagnostic ignored "-Wconversion" |
| |
| #define ATRACE_TAG ATRACE_TAG_GRAPHICS |
| //#define LOG_NDEBUG 0 |
| |
| // This is needed for stdint.h to define INT64_MAX in C++ |
| #define __STDC_LIMIT_MACROS |
| |
| #include <math.h> |
| |
| #include <algorithm> |
| |
| #include <android-base/stringprintf.h> |
| #include <cutils/properties.h> |
| #include <log/log.h> |
| #include <utils/Thread.h> |
| #include <utils/Trace.h> |
| |
| #include <ui/FenceTime.h> |
| |
| #include "DispSync.h" |
| #include "EventLog/EventLog.h" |
| #include "SurfaceFlinger.h" |
| |
| using android::base::StringAppendF; |
| using std::max; |
| using std::min; |
| |
| namespace android { |
| |
| DispSync::~DispSync() = default; |
| DispSync::Callback::~Callback() = default; |
| |
| namespace impl { |
| |
| // Setting this to true adds a zero-phase tracer for correlating with hardware |
| // vsync events |
| static const bool kEnableZeroPhaseTracer = false; |
| |
| // This is the threshold used to determine when hardware vsync events are |
| // needed to re-synchronize the software vsync model with the hardware. The |
| // error metric used is the mean of the squared difference between each |
| // present time and the nearest software-predicted vsync. |
| static const nsecs_t kErrorThreshold = 160000000000; // 400 usec squared |
| |
| #undef LOG_TAG |
| #define LOG_TAG "DispSyncThread" |
| class DispSyncThread : public Thread { |
| public: |
| DispSyncThread(const char* name, bool showTraceDetailedInfo) |
| : mName(name), |
| mStop(false), |
| mModelLocked("DispSync:ModelLocked", false), |
| mPeriod(0), |
| mPhase(0), |
| mReferenceTime(0), |
| mWakeupLatency(0), |
| mFrameNumber(0), |
| mTraceDetailedInfo(showTraceDetailedInfo) {} |
| |
| virtual ~DispSyncThread() {} |
| |
| void updateModel(nsecs_t period, nsecs_t phase, nsecs_t referenceTime) { |
| if (mTraceDetailedInfo) ATRACE_CALL(); |
| Mutex::Autolock lock(mMutex); |
| |
| mPhase = phase; |
| const bool referenceTimeChanged = mReferenceTime != referenceTime; |
| mReferenceTime = referenceTime; |
| if (mPeriod != 0 && mPeriod != period && mReferenceTime != 0) { |
| // Inflate the reference time to be the most recent predicted |
| // vsync before the current time. |
| const nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC); |
| const nsecs_t baseTime = now - mReferenceTime; |
| const nsecs_t numOldPeriods = baseTime / mPeriod; |
| mReferenceTime = mReferenceTime + (numOldPeriods)*mPeriod; |
| } |
| mPeriod = period; |
| if (!mModelLocked && referenceTimeChanged) { |
| for (auto& eventListener : mEventListeners) { |
| eventListener.mLastEventTime = mReferenceTime + mPhase + eventListener.mPhase; |
| // If mLastEventTime is after mReferenceTime (can happen when positive phase offsets |
| // are used) we treat it as like it happened in previous period. |
| if (eventListener.mLastEventTime > mReferenceTime) { |
| eventListener.mLastEventTime -= mPeriod; |
| } |
| } |
| } |
| if (mTraceDetailedInfo) { |
| ATRACE_INT64("DispSync:Period", mPeriod); |
| ATRACE_INT64("DispSync:Phase", mPhase + mPeriod / 2); |
| ATRACE_INT64("DispSync:Reference Time", mReferenceTime); |
| } |
| ALOGV("[%s] updateModel: mPeriod = %" PRId64 ", mPhase = %" PRId64 |
| " mReferenceTime = %" PRId64, |
| mName, ns2us(mPeriod), ns2us(mPhase), ns2us(mReferenceTime)); |
| mCond.signal(); |
| } |
| |
| void stop() { |
| if (mTraceDetailedInfo) ATRACE_CALL(); |
| Mutex::Autolock lock(mMutex); |
| mStop = true; |
| mCond.signal(); |
| } |
| |
| void lockModel() { |
| Mutex::Autolock lock(mMutex); |
| mModelLocked = true; |
| } |
| |
| void unlockModel() { |
| Mutex::Autolock lock(mMutex); |
| mModelLocked = false; |
| } |
| |
| virtual bool threadLoop() { |
| status_t err; |
| nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC); |
| |
| while (true) { |
| std::vector<CallbackInvocation> callbackInvocations; |
| |
| nsecs_t targetTime = 0; |
| |
| { // Scope for lock |
| Mutex::Autolock lock(mMutex); |
| |
| if (mTraceDetailedInfo) { |
| ATRACE_INT64("DispSync:Frame", mFrameNumber); |
| } |
| ALOGV("[%s] Frame %" PRId64, mName, mFrameNumber); |
| ++mFrameNumber; |
| |
| if (mStop) { |
| return false; |
| } |
| |
| if (mPeriod == 0) { |
| err = mCond.wait(mMutex); |
| if (err != NO_ERROR) { |
| ALOGE("error waiting for new events: %s (%d)", strerror(-err), err); |
| return false; |
| } |
| continue; |
| } |
| |
| targetTime = computeNextEventTimeLocked(now); |
| |
| bool isWakeup = false; |
| |
| if (now < targetTime) { |
| if (mTraceDetailedInfo) ATRACE_NAME("DispSync waiting"); |
| |
| if (targetTime == INT64_MAX) { |
| ALOGV("[%s] Waiting forever", mName); |
| err = mCond.wait(mMutex); |
| } else { |
| ALOGV("[%s] Waiting until %" PRId64, mName, ns2us(targetTime)); |
| err = mCond.waitRelative(mMutex, targetTime - now); |
| } |
| |
| if (err == TIMED_OUT) { |
| isWakeup = true; |
| } else if (err != NO_ERROR) { |
| ALOGE("error waiting for next event: %s (%d)", strerror(-err), err); |
| return false; |
| } |
| } |
| |
| now = systemTime(SYSTEM_TIME_MONOTONIC); |
| |
| // Don't correct by more than 1.5 ms |
| static const nsecs_t kMaxWakeupLatency = us2ns(1500); |
| |
| if (isWakeup) { |
| mWakeupLatency = ((mWakeupLatency * 63) + (now - targetTime)) / 64; |
| mWakeupLatency = min(mWakeupLatency, kMaxWakeupLatency); |
| if (mTraceDetailedInfo) { |
| ATRACE_INT64("DispSync:WakeupLat", now - targetTime); |
| ATRACE_INT64("DispSync:AvgWakeupLat", mWakeupLatency); |
| } |
| } |
| |
| callbackInvocations = |
| gatherCallbackInvocationsLocked(now, computeNextRefreshLocked(0, now)); |
| } |
| |
| if (callbackInvocations.size() > 0) { |
| fireCallbackInvocations(callbackInvocations); |
| } |
| } |
| |
| return false; |
| } |
| |
| status_t addEventListener(const char* name, nsecs_t phase, DispSync::Callback* callback, |
| nsecs_t lastCallbackTime) { |
| if (mTraceDetailedInfo) ATRACE_CALL(); |
| Mutex::Autolock lock(mMutex); |
| |
| for (size_t i = 0; i < mEventListeners.size(); i++) { |
| if (mEventListeners[i].mCallback == callback) { |
| return BAD_VALUE; |
| } |
| } |
| |
| EventListener listener; |
| listener.mName = name; |
| listener.mPhase = phase; |
| listener.mCallback = callback; |
| |
| // We want to allow the firstmost future event to fire without |
| // allowing any past events to fire. To do this extrapolate from |
| // mReferenceTime the most recent hardware vsync, and pin the |
| // last event time there. |
| const nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC); |
| if (mPeriod != 0) { |
| const nsecs_t baseTime = now - mReferenceTime; |
| const nsecs_t numPeriodsSinceReference = baseTime / mPeriod; |
| const nsecs_t predictedReference = mReferenceTime + numPeriodsSinceReference * mPeriod; |
| const nsecs_t phaseCorrection = mPhase + listener.mPhase; |
| const nsecs_t predictedLastEventTime = predictedReference + phaseCorrection; |
| if (predictedLastEventTime >= now) { |
| // Make sure that the last event time does not exceed the current time. |
| // If it would, then back the last event time by a period. |
| listener.mLastEventTime = predictedLastEventTime - mPeriod; |
| } else { |
| listener.mLastEventTime = predictedLastEventTime; |
| } |
| } else { |
| listener.mLastEventTime = now + mPhase - mWakeupLatency; |
| } |
| |
| if (lastCallbackTime <= 0) { |
| // If there is no prior callback time, try to infer one based on the |
| // logical last event time. |
| listener.mLastCallbackTime = listener.mLastEventTime + mWakeupLatency; |
| } else { |
| listener.mLastCallbackTime = lastCallbackTime; |
| } |
| |
| mEventListeners.push_back(listener); |
| |
| mCond.signal(); |
| |
| return NO_ERROR; |
| } |
| |
| status_t removeEventListener(DispSync::Callback* callback, nsecs_t* outLastCallback) { |
| if (mTraceDetailedInfo) ATRACE_CALL(); |
| Mutex::Autolock lock(mMutex); |
| |
| for (std::vector<EventListener>::iterator it = mEventListeners.begin(); |
| it != mEventListeners.end(); ++it) { |
| if (it->mCallback == callback) { |
| *outLastCallback = it->mLastCallbackTime; |
| mEventListeners.erase(it); |
| mCond.signal(); |
| return NO_ERROR; |
| } |
| } |
| |
| return BAD_VALUE; |
| } |
| |
| status_t changePhaseOffset(DispSync::Callback* callback, nsecs_t phase) { |
| if (mTraceDetailedInfo) ATRACE_CALL(); |
| Mutex::Autolock lock(mMutex); |
| |
| for (auto& eventListener : mEventListeners) { |
| if (eventListener.mCallback == callback) { |
| const nsecs_t oldPhase = eventListener.mPhase; |
| eventListener.mPhase = phase; |
| |
| // Pretend that the last time this event was handled at the same frame but with the |
| // new offset to allow for a seamless offset change without double-firing or |
| // skipping. |
| nsecs_t diff = oldPhase - phase; |
| eventListener.mLastEventTime -= diff; |
| eventListener.mLastCallbackTime -= diff; |
| mCond.signal(); |
| return NO_ERROR; |
| } |
| } |
| return BAD_VALUE; |
| } |
| |
| nsecs_t computeNextRefresh(int periodOffset, nsecs_t now) const { |
| Mutex::Autolock lock(mMutex); |
| return computeNextRefreshLocked(periodOffset, now); |
| } |
| |
| private: |
| struct EventListener { |
| const char* mName; |
| nsecs_t mPhase; |
| nsecs_t mLastEventTime; |
| nsecs_t mLastCallbackTime; |
| DispSync::Callback* mCallback; |
| }; |
| |
| struct CallbackInvocation { |
| DispSync::Callback* mCallback; |
| nsecs_t mEventTime; |
| nsecs_t mExpectedVSyncTime; |
| }; |
| |
| nsecs_t computeNextEventTimeLocked(nsecs_t now) { |
| if (mTraceDetailedInfo) ATRACE_CALL(); |
| ALOGV("[%s] computeNextEventTimeLocked", mName); |
| nsecs_t nextEventTime = INT64_MAX; |
| for (size_t i = 0; i < mEventListeners.size(); i++) { |
| nsecs_t t = computeListenerNextEventTimeLocked(mEventListeners[i], now); |
| |
| if (t < nextEventTime) { |
| nextEventTime = t; |
| } |
| } |
| |
| ALOGV("[%s] nextEventTime = %" PRId64, mName, ns2us(nextEventTime)); |
| return nextEventTime; |
| } |
| |
| // Sanity check that the duration is close enough in length to a period without |
| // falling into double-rate vsyncs. |
| bool isCloseToPeriod(nsecs_t duration) { |
| // Ratio of 3/5 is arbitrary, but it must be greater than 1/2. |
| return duration < (3 * mPeriod) / 5; |
| } |
| |
| std::vector<CallbackInvocation> gatherCallbackInvocationsLocked(nsecs_t now, |
| nsecs_t expectedVSyncTime) { |
| if (mTraceDetailedInfo) ATRACE_CALL(); |
| ALOGV("[%s] gatherCallbackInvocationsLocked @ %" PRId64, mName, ns2us(now)); |
| |
| std::vector<CallbackInvocation> callbackInvocations; |
| nsecs_t onePeriodAgo = now - mPeriod; |
| |
| for (auto& eventListener : mEventListeners) { |
| nsecs_t t = computeListenerNextEventTimeLocked(eventListener, onePeriodAgo); |
| |
| if (t < now) { |
| if (isCloseToPeriod(now - eventListener.mLastCallbackTime)) { |
| eventListener.mLastEventTime = t; |
| ALOGV("[%s] [%s] Skipping event due to model error", mName, |
| eventListener.mName); |
| continue; |
| } |
| |
| CallbackInvocation ci; |
| ci.mCallback = eventListener.mCallback; |
| ci.mEventTime = t; |
| ci.mExpectedVSyncTime = expectedVSyncTime; |
| if (eventListener.mPhase < 0) { |
| ci.mExpectedVSyncTime += mPeriod; |
| } |
| ALOGV("[%s] [%s] Preparing to fire, latency: %" PRId64, mName, eventListener.mName, |
| t - eventListener.mLastEventTime); |
| callbackInvocations.push_back(ci); |
| eventListener.mLastEventTime = t; |
| eventListener.mLastCallbackTime = now; |
| } |
| } |
| |
| return callbackInvocations; |
| } |
| |
| nsecs_t computeListenerNextEventTimeLocked(const EventListener& listener, nsecs_t baseTime) { |
| if (mTraceDetailedInfo) ATRACE_CALL(); |
| ALOGV("[%s] [%s] computeListenerNextEventTimeLocked(%" PRId64 ")", mName, listener.mName, |
| ns2us(baseTime)); |
| |
| nsecs_t lastEventTime = listener.mLastEventTime + mWakeupLatency; |
| ALOGV("[%s] lastEventTime: %" PRId64, mName, ns2us(lastEventTime)); |
| if (baseTime < lastEventTime) { |
| baseTime = lastEventTime; |
| ALOGV("[%s] Clamping baseTime to lastEventTime -> %" PRId64, mName, ns2us(baseTime)); |
| } |
| |
| baseTime -= mReferenceTime; |
| ALOGV("[%s] Relative baseTime = %" PRId64, mName, ns2us(baseTime)); |
| nsecs_t phase = mPhase + listener.mPhase; |
| ALOGV("[%s] Phase = %" PRId64, mName, ns2us(phase)); |
| baseTime -= phase; |
| ALOGV("[%s] baseTime - phase = %" PRId64, mName, ns2us(baseTime)); |
| |
| // If our previous time is before the reference (because the reference |
| // has since been updated), the division by mPeriod will truncate |
| // towards zero instead of computing the floor. Since in all cases |
| // before the reference we want the next time to be effectively now, we |
| // set baseTime to -mPeriod so that numPeriods will be -1. |
| // When we add 1 and the phase, we will be at the correct event time for |
| // this period. |
| if (baseTime < 0) { |
| ALOGV("[%s] Correcting negative baseTime", mName); |
| baseTime = -mPeriod; |
| } |
| |
| nsecs_t numPeriods = baseTime / mPeriod; |
| ALOGV("[%s] numPeriods = %" PRId64, mName, numPeriods); |
| nsecs_t t = (numPeriods + 1) * mPeriod + phase; |
| ALOGV("[%s] t = %" PRId64, mName, ns2us(t)); |
| t += mReferenceTime; |
| ALOGV("[%s] Absolute t = %" PRId64, mName, ns2us(t)); |
| |
| // Check that it's been slightly more than half a period since the last |
| // event so that we don't accidentally fall into double-rate vsyncs |
| if (isCloseToPeriod(t - listener.mLastEventTime)) { |
| t += mPeriod; |
| ALOGV("[%s] Modifying t -> %" PRId64, mName, ns2us(t)); |
| } |
| |
| t -= mWakeupLatency; |
| ALOGV("[%s] Corrected for wakeup latency -> %" PRId64, mName, ns2us(t)); |
| |
| return t; |
| } |
| |
| void fireCallbackInvocations(const std::vector<CallbackInvocation>& callbacks) { |
| if (mTraceDetailedInfo) ATRACE_CALL(); |
| for (size_t i = 0; i < callbacks.size(); i++) { |
| callbacks[i].mCallback->onDispSyncEvent(callbacks[i].mEventTime, |
| callbacks[i].mExpectedVSyncTime); |
| } |
| } |
| |
| nsecs_t computeNextRefreshLocked(int periodOffset, nsecs_t now) const { |
| nsecs_t phase = mReferenceTime + mPhase; |
| if (mPeriod == 0) { |
| return 0; |
| } |
| return (((now - phase) / mPeriod) + periodOffset + 1) * mPeriod + phase; |
| } |
| |
| const char* const mName; |
| |
| bool mStop; |
| TracedOrdinal<bool> mModelLocked; |
| |
| nsecs_t mPeriod; |
| nsecs_t mPhase; |
| nsecs_t mReferenceTime; |
| nsecs_t mWakeupLatency; |
| |
| int64_t mFrameNumber; |
| |
| std::vector<EventListener> mEventListeners; |
| |
| mutable Mutex mMutex; |
| Condition mCond; |
| |
| // Flag to turn on logging in systrace. |
| const bool mTraceDetailedInfo; |
| }; |
| |
| #undef LOG_TAG |
| #define LOG_TAG "DispSync" |
| |
| class ZeroPhaseTracer : public DispSync::Callback { |
| public: |
| ZeroPhaseTracer() : mParity("ZERO_PHASE_VSYNC", false) {} |
| |
| virtual void onDispSyncEvent(nsecs_t /*when*/, nsecs_t /*expectedVSyncTimestamp*/) { |
| mParity = !mParity; |
| } |
| |
| private: |
| TracedOrdinal<bool> mParity; |
| }; |
| |
| DispSync::DispSync(const char* name, bool hasSyncFramework) |
| : mName(name), mIgnorePresentFences(!hasSyncFramework) { |
| // This flag offers the ability to turn on systrace logging from the shell. |
| char value[PROPERTY_VALUE_MAX]; |
| property_get("debug.sf.dispsync_trace_detailed_info", value, "0"); |
| mTraceDetailedInfo = atoi(value); |
| |
| mThread = new DispSyncThread(name, mTraceDetailedInfo); |
| mThread->run("DispSync", PRIORITY_URGENT_DISPLAY + PRIORITY_MORE_FAVORABLE); |
| |
| // set DispSync to SCHED_FIFO to minimize jitter |
| struct sched_param param = {0}; |
| param.sched_priority = 2; |
| if (sched_setscheduler(mThread->getTid(), SCHED_FIFO, ¶m) != 0) { |
| ALOGE("Couldn't set SCHED_FIFO for DispSyncThread"); |
| } |
| |
| beginResync(); |
| |
| if (mTraceDetailedInfo && kEnableZeroPhaseTracer) { |
| mZeroPhaseTracer = std::make_unique<ZeroPhaseTracer>(); |
| addEventListener("ZeroPhaseTracer", 0, mZeroPhaseTracer.get(), 0); |
| } |
| } |
| |
| DispSync::~DispSync() { |
| mThread->stop(); |
| mThread->requestExitAndWait(); |
| } |
| |
| void DispSync::reset() { |
| Mutex::Autolock lock(mMutex); |
| resetLocked(); |
| } |
| |
| void DispSync::resetLocked() { |
| mPhase = 0; |
| const size_t lastSampleIdx = (mFirstResyncSample + mNumResyncSamples - 1) % MAX_RESYNC_SAMPLES; |
| // Keep the most recent sample, when we resync to hardware we'll overwrite this |
| // with a more accurate signal |
| if (mResyncSamples[lastSampleIdx] != 0) { |
| mReferenceTime = mResyncSamples[lastSampleIdx]; |
| } |
| mModelUpdated = false; |
| for (size_t i = 0; i < MAX_RESYNC_SAMPLES; i++) { |
| mResyncSamples[i] = 0; |
| } |
| mNumResyncSamples = 0; |
| mFirstResyncSample = 0; |
| mNumResyncSamplesSincePresent = 0; |
| mThread->unlockModel(); |
| resetErrorLocked(); |
| } |
| |
| bool DispSync::addPresentFence(const std::shared_ptr<FenceTime>& fenceTime) { |
| Mutex::Autolock lock(mMutex); |
| |
| if (mIgnorePresentFences) { |
| return true; |
| } |
| |
| mPresentFences[mPresentSampleOffset] = fenceTime; |
| mPresentSampleOffset = (mPresentSampleOffset + 1) % NUM_PRESENT_SAMPLES; |
| mNumResyncSamplesSincePresent = 0; |
| |
| updateErrorLocked(); |
| |
| return !mModelUpdated || mError > kErrorThreshold; |
| } |
| |
| void DispSync::beginResync() { |
| Mutex::Autolock lock(mMutex); |
| ALOGV("[%s] beginResync", mName); |
| resetLocked(); |
| } |
| |
| bool DispSync::addResyncSample(nsecs_t timestamp, std::optional<nsecs_t> /*hwcVsyncPeriod*/, |
| bool* periodFlushed) { |
| Mutex::Autolock lock(mMutex); |
| |
| ALOGV("[%s] addResyncSample(%" PRId64 ")", mName, ns2us(timestamp)); |
| |
| *periodFlushed = false; |
| const size_t idx = (mFirstResyncSample + mNumResyncSamples) % MAX_RESYNC_SAMPLES; |
| mResyncSamples[idx] = timestamp; |
| if (mNumResyncSamples == 0) { |
| mPhase = 0; |
| ALOGV("[%s] First resync sample: mPeriod = %" PRId64 ", mPhase = 0, " |
| "mReferenceTime = %" PRId64, |
| mName, ns2us(mPeriod), ns2us(timestamp)); |
| } else if (mPendingPeriod > 0) { |
| // mNumResyncSamples > 0, so priorIdx won't overflow |
| const size_t priorIdx = (mFirstResyncSample + mNumResyncSamples - 1) % MAX_RESYNC_SAMPLES; |
| const nsecs_t lastTimestamp = mResyncSamples[priorIdx]; |
| |
| const nsecs_t observedVsync = std::abs(timestamp - lastTimestamp); |
| if (std::abs(observedVsync - mPendingPeriod) <= std::abs(observedVsync - mIntendedPeriod)) { |
| // Either the observed vsync is closer to the pending period, (and |
| // thus we detected a period change), or the period change will |
| // no-op. In either case, reset the model and flush the pending |
| // period. |
| resetLocked(); |
| mIntendedPeriod = mPendingPeriod; |
| mPeriod = mPendingPeriod; |
| mPendingPeriod = 0; |
| if (mTraceDetailedInfo) { |
| ATRACE_INT("DispSync:PendingPeriod", mPendingPeriod); |
| ATRACE_INT("DispSync:IntendedPeriod", mIntendedPeriod); |
| } |
| *periodFlushed = true; |
| } |
| } |
| // Always update the reference time with the most recent timestamp. |
| mReferenceTime = timestamp; |
| mThread->updateModel(mPeriod, mPhase, mReferenceTime); |
| |
| if (mNumResyncSamples < MAX_RESYNC_SAMPLES) { |
| mNumResyncSamples++; |
| } else { |
| mFirstResyncSample = (mFirstResyncSample + 1) % MAX_RESYNC_SAMPLES; |
| } |
| |
| updateModelLocked(); |
| |
| if (mNumResyncSamplesSincePresent++ > MAX_RESYNC_SAMPLES_WITHOUT_PRESENT) { |
| resetErrorLocked(); |
| } |
| |
| if (mIgnorePresentFences) { |
| // If we're ignoring the present fences we have no way to know whether |
| // or not we're synchronized with the HW vsyncs, so we just request |
| // that the HW vsync events be turned on. |
| return true; |
| } |
| |
| // Check against kErrorThreshold / 2 to add some hysteresis before having to |
| // resync again |
| bool modelLocked = mModelUpdated && mError < (kErrorThreshold / 2) && mPendingPeriod == 0; |
| ALOGV("[%s] addResyncSample returning %s", mName, modelLocked ? "locked" : "unlocked"); |
| if (modelLocked) { |
| *periodFlushed = true; |
| mThread->lockModel(); |
| } |
| return !modelLocked; |
| } |
| |
| void DispSync::endResync() { |
| mThread->lockModel(); |
| } |
| |
| status_t DispSync::addEventListener(const char* name, nsecs_t phase, Callback* callback, |
| nsecs_t lastCallbackTime) { |
| Mutex::Autolock lock(mMutex); |
| return mThread->addEventListener(name, phase, callback, lastCallbackTime); |
| } |
| |
| status_t DispSync::removeEventListener(Callback* callback, nsecs_t* outLastCallbackTime) { |
| Mutex::Autolock lock(mMutex); |
| return mThread->removeEventListener(callback, outLastCallbackTime); |
| } |
| |
| status_t DispSync::changePhaseOffset(Callback* callback, nsecs_t phase) { |
| Mutex::Autolock lock(mMutex); |
| return mThread->changePhaseOffset(callback, phase); |
| } |
| |
| void DispSync::setPeriod(nsecs_t period) { |
| Mutex::Autolock lock(mMutex); |
| |
| const bool pendingPeriodShouldChange = |
| period != mIntendedPeriod || (period == mIntendedPeriod && mPendingPeriod != 0); |
| |
| if (pendingPeriodShouldChange) { |
| mPendingPeriod = period; |
| } |
| if (mTraceDetailedInfo) { |
| ATRACE_INT("DispSync:IntendedPeriod", mIntendedPeriod); |
| ATRACE_INT("DispSync:PendingPeriod", mPendingPeriod); |
| } |
| } |
| |
| nsecs_t DispSync::getPeriod() { |
| // lock mutex as mPeriod changes multiple times in updateModelLocked |
| Mutex::Autolock lock(mMutex); |
| return mPeriod; |
| } |
| |
| void DispSync::updateModelLocked() { |
| ALOGV("[%s] updateModelLocked %zu", mName, mNumResyncSamples); |
| if (mNumResyncSamples >= MIN_RESYNC_SAMPLES_FOR_UPDATE) { |
| ALOGV("[%s] Computing...", mName); |
| nsecs_t durationSum = 0; |
| nsecs_t minDuration = INT64_MAX; |
| nsecs_t maxDuration = 0; |
| // We skip the first 2 samples because the first vsync duration on some |
| // devices may be much more inaccurate than on other devices, e.g. due |
| // to delays in ramping up from a power collapse. By doing so this |
| // actually increases the accuracy of the DispSync model even though |
| // we're effectively relying on fewer sample points. |
| static constexpr size_t numSamplesSkipped = 2; |
| for (size_t i = numSamplesSkipped; i < mNumResyncSamples; i++) { |
| size_t idx = (mFirstResyncSample + i) % MAX_RESYNC_SAMPLES; |
| size_t prev = (idx + MAX_RESYNC_SAMPLES - 1) % MAX_RESYNC_SAMPLES; |
| nsecs_t duration = mResyncSamples[idx] - mResyncSamples[prev]; |
| durationSum += duration; |
| minDuration = min(minDuration, duration); |
| maxDuration = max(maxDuration, duration); |
| } |
| |
| // Exclude the min and max from the average |
| durationSum -= minDuration + maxDuration; |
| mPeriod = durationSum / (mNumResyncSamples - numSamplesSkipped - 2); |
| |
| ALOGV("[%s] mPeriod = %" PRId64, mName, ns2us(mPeriod)); |
| |
| double sampleAvgX = 0; |
| double sampleAvgY = 0; |
| double scale = 2.0 * M_PI / double(mPeriod); |
| for (size_t i = numSamplesSkipped; i < mNumResyncSamples; i++) { |
| size_t idx = (mFirstResyncSample + i) % MAX_RESYNC_SAMPLES; |
| nsecs_t sample = mResyncSamples[idx] - mReferenceTime; |
| double samplePhase = double(sample % mPeriod) * scale; |
| sampleAvgX += cos(samplePhase); |
| sampleAvgY += sin(samplePhase); |
| } |
| |
| sampleAvgX /= double(mNumResyncSamples - numSamplesSkipped); |
| sampleAvgY /= double(mNumResyncSamples - numSamplesSkipped); |
| |
| mPhase = nsecs_t(atan2(sampleAvgY, sampleAvgX) / scale); |
| |
| ALOGV("[%s] mPhase = %" PRId64, mName, ns2us(mPhase)); |
| |
| if (mPhase < -(mPeriod / 2)) { |
| mPhase += mPeriod; |
| ALOGV("[%s] Adjusting mPhase -> %" PRId64, mName, ns2us(mPhase)); |
| } |
| |
| mThread->updateModel(mPeriod, mPhase, mReferenceTime); |
| mModelUpdated = true; |
| } |
| } |
| |
| void DispSync::updateErrorLocked() { |
| if (!mModelUpdated) { |
| return; |
| } |
| |
| int numErrSamples = 0; |
| nsecs_t sqErrSum = 0; |
| |
| for (size_t i = 0; i < NUM_PRESENT_SAMPLES; i++) { |
| // Only check for the cached value of signal time to avoid unecessary |
| // syscalls. It is the responsibility of the DispSync owner to |
| // call getSignalTime() periodically so the cache is updated when the |
| // fence signals. |
| nsecs_t time = mPresentFences[i]->getCachedSignalTime(); |
| if (time == Fence::SIGNAL_TIME_PENDING || time == Fence::SIGNAL_TIME_INVALID) { |
| continue; |
| } |
| |
| nsecs_t sample = time - mReferenceTime; |
| if (sample <= mPhase) { |
| continue; |
| } |
| |
| nsecs_t sampleErr = (sample - mPhase) % mPeriod; |
| if (sampleErr > mPeriod / 2) { |
| sampleErr -= mPeriod; |
| } |
| sqErrSum += sampleErr * sampleErr; |
| numErrSamples++; |
| } |
| |
| if (numErrSamples > 0) { |
| mError = sqErrSum / numErrSamples; |
| mZeroErrSamplesCount = 0; |
| } else { |
| mError = 0; |
| // Use mod ACCEPTABLE_ZERO_ERR_SAMPLES_COUNT to avoid log spam. |
| mZeroErrSamplesCount++; |
| ALOGE_IF((mZeroErrSamplesCount % ACCEPTABLE_ZERO_ERR_SAMPLES_COUNT) == 0, |
| "No present times for model error."); |
| } |
| |
| if (mTraceDetailedInfo) { |
| ATRACE_INT64("DispSync:Error", mError); |
| } |
| } |
| |
| void DispSync::resetErrorLocked() { |
| mPresentSampleOffset = 0; |
| mError = 0; |
| mZeroErrSamplesCount = 0; |
| if (mTraceDetailedInfo) { |
| ATRACE_INT64("DispSync:Error", mError); |
| } |
| for (size_t i = 0; i < NUM_PRESENT_SAMPLES; i++) { |
| mPresentFences[i] = FenceTime::NO_FENCE; |
| } |
| } |
| |
| nsecs_t DispSync::computeNextRefresh(int periodOffset, nsecs_t now) const { |
| Mutex::Autolock lock(mMutex); |
| nsecs_t phase = mReferenceTime + mPhase; |
| if (mPeriod == 0) { |
| return 0; |
| } |
| return (((now - phase) / mPeriod) + periodOffset + 1) * mPeriod + phase; |
| } |
| |
| void DispSync::setIgnorePresentFences(bool ignore) { |
| Mutex::Autolock lock(mMutex); |
| if (mIgnorePresentFences != ignore) { |
| mIgnorePresentFences = ignore; |
| resetLocked(); |
| } |
| } |
| |
| void DispSync::dump(std::string& result) const { |
| Mutex::Autolock lock(mMutex); |
| StringAppendF(&result, "present fences are %s\n", mIgnorePresentFences ? "ignored" : "used"); |
| StringAppendF(&result, "mPeriod: %" PRId64 " ns (%.3f fps)\n", mPeriod, 1000000000.0 / mPeriod); |
| StringAppendF(&result, "mPhase: %" PRId64 " ns\n", mPhase); |
| StringAppendF(&result, "mError: %" PRId64 " ns (sqrt=%.1f)\n", mError, sqrt(mError)); |
| StringAppendF(&result, "mNumResyncSamplesSincePresent: %d (limit %d)\n", |
| mNumResyncSamplesSincePresent, MAX_RESYNC_SAMPLES_WITHOUT_PRESENT); |
| StringAppendF(&result, "mNumResyncSamples: %zd (max %d)\n", mNumResyncSamples, |
| MAX_RESYNC_SAMPLES); |
| |
| result.append("mResyncSamples:\n"); |
| nsecs_t previous = -1; |
| for (size_t i = 0; i < mNumResyncSamples; i++) { |
| size_t idx = (mFirstResyncSample + i) % MAX_RESYNC_SAMPLES; |
| nsecs_t sampleTime = mResyncSamples[idx]; |
| if (i == 0) { |
| StringAppendF(&result, " %" PRId64 "\n", sampleTime); |
| } else { |
| StringAppendF(&result, " %" PRId64 " (+%" PRId64 ")\n", sampleTime, |
| sampleTime - previous); |
| } |
| previous = sampleTime; |
| } |
| |
| StringAppendF(&result, "mPresentFences [%d]:\n", NUM_PRESENT_SAMPLES); |
| nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC); |
| previous = Fence::SIGNAL_TIME_INVALID; |
| for (size_t i = 0; i < NUM_PRESENT_SAMPLES; i++) { |
| size_t idx = (i + mPresentSampleOffset) % NUM_PRESENT_SAMPLES; |
| nsecs_t presentTime = mPresentFences[idx]->getSignalTime(); |
| if (presentTime == Fence::SIGNAL_TIME_PENDING) { |
| StringAppendF(&result, " [unsignaled fence]\n"); |
| } else if (presentTime == Fence::SIGNAL_TIME_INVALID) { |
| StringAppendF(&result, " [invalid fence]\n"); |
| } else if (previous == Fence::SIGNAL_TIME_PENDING || |
| previous == Fence::SIGNAL_TIME_INVALID) { |
| StringAppendF(&result, " %" PRId64 " (%.3f ms ago)\n", presentTime, |
| (now - presentTime) / 1000000.0); |
| } else { |
| StringAppendF(&result, " %" PRId64 " (+%" PRId64 " / %.3f) (%.3f ms ago)\n", |
| presentTime, presentTime - previous, |
| (presentTime - previous) / (double)mPeriod, |
| (now - presentTime) / 1000000.0); |
| } |
| previous = presentTime; |
| } |
| |
| StringAppendF(&result, "current monotonic time: %" PRId64 "\n", now); |
| } |
| |
| nsecs_t DispSync::expectedPresentTime(nsecs_t now) { |
| // The HWC doesn't currently have a way to report additional latency. |
| // Assume that whatever we submit now will appear right after the flip. |
| // For a smart panel this might be 1. This is expressed in frames, |
| // rather than time, because we expect to have a constant frame delay |
| // regardless of the refresh rate. |
| const uint32_t hwcLatency = 0; |
| |
| // Ask DispSync when the next refresh will be (CLOCK_MONOTONIC). |
| return mThread->computeNextRefresh(hwcLatency, now); |
| } |
| |
| } // namespace impl |
| |
| } // namespace android |
| |
| // TODO(b/129481165): remove the #pragma below and fix conversion issues |
| #pragma clang diagnostic pop // ignored "-Wconversion" |
