718 lines
23 KiB
C++
718 lines
23 KiB
C++
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define ATRACE_TAG ATRACE_TAG_GRAPHICS
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//#define LOG_NDEBUG 0
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// This is needed for stdint.h to define INT64_MAX in C++
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#define __STDC_LIMIT_MACROS
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#include <math.h>
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#include <cutils/iosched_policy.h>
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#include <cutils/log.h>
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#include <ui/Fence.h>
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#include <utils/String8.h>
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#include <utils/Thread.h>
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#include <utils/Trace.h>
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#include <utils/Vector.h>
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#include "DispSync.h"
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#include "EventLog/EventLog.h"
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#include <algorithm>
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using std::max;
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using std::min;
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namespace android {
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// Setting this to true enables verbose tracing that can be used to debug
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// vsync event model or phase issues.
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static const bool kTraceDetailedInfo = false;
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// Setting this to true adds a zero-phase tracer for correlating with hardware
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// vsync events
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static const bool kEnableZeroPhaseTracer = false;
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// This is the threshold used to determine when hardware vsync events are
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// needed to re-synchronize the software vsync model with the hardware. The
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// error metric used is the mean of the squared difference between each
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// present time and the nearest software-predicted vsync.
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static const nsecs_t kErrorThreshold = 160000000000; // 400 usec squared
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// This is the offset from the present fence timestamps to the corresponding
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// vsync event.
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static const int64_t kPresentTimeOffset = PRESENT_TIME_OFFSET_FROM_VSYNC_NS;
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#undef LOG_TAG
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#define LOG_TAG "DispSyncThread"
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class DispSyncThread: public Thread {
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public:
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DispSyncThread(const char* name):
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mName(name),
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mStop(false),
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mPeriod(0),
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mPhase(0),
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mReferenceTime(0),
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mWakeupLatency(0),
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mFrameNumber(0) {}
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virtual ~DispSyncThread() {}
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void updateModel(nsecs_t period, nsecs_t phase, nsecs_t referenceTime) {
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if (kTraceDetailedInfo) ATRACE_CALL();
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Mutex::Autolock lock(mMutex);
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mPeriod = period;
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mPhase = phase;
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mReferenceTime = referenceTime;
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ALOGV("[%s] updateModel: mPeriod = %" PRId64 ", mPhase = %" PRId64
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" mReferenceTime = %" PRId64, mName, ns2us(mPeriod),
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ns2us(mPhase), ns2us(mReferenceTime));
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mCond.signal();
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}
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void stop() {
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if (kTraceDetailedInfo) ATRACE_CALL();
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Mutex::Autolock lock(mMutex);
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mStop = true;
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mCond.signal();
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}
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virtual bool threadLoop() {
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status_t err;
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nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);
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while (true) {
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Vector<CallbackInvocation> callbackInvocations;
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nsecs_t targetTime = 0;
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{ // Scope for lock
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Mutex::Autolock lock(mMutex);
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if (kTraceDetailedInfo) {
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ATRACE_INT64("DispSync:Frame", mFrameNumber);
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}
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ALOGV("[%s] Frame %" PRId64, mName, mFrameNumber);
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++mFrameNumber;
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if (mStop) {
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return false;
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}
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if (mPeriod == 0) {
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err = mCond.wait(mMutex);
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if (err != NO_ERROR) {
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ALOGE("error waiting for new events: %s (%d)",
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strerror(-err), err);
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return false;
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}
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continue;
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}
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targetTime = computeNextEventTimeLocked(now);
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bool isWakeup = false;
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if (now < targetTime) {
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if (kTraceDetailedInfo) ATRACE_NAME("DispSync waiting");
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if (targetTime == INT64_MAX) {
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ALOGV("[%s] Waiting forever", mName);
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err = mCond.wait(mMutex);
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} else {
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ALOGV("[%s] Waiting until %" PRId64, mName,
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ns2us(targetTime));
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err = mCond.waitRelative(mMutex, targetTime - now);
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}
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if (err == TIMED_OUT) {
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isWakeup = true;
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} else if (err != NO_ERROR) {
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ALOGE("error waiting for next event: %s (%d)",
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strerror(-err), err);
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return false;
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}
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}
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now = systemTime(SYSTEM_TIME_MONOTONIC);
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// Don't correct by more than 1.5 ms
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static const nsecs_t kMaxWakeupLatency = us2ns(1500);
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if (isWakeup) {
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mWakeupLatency = ((mWakeupLatency * 63) +
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(now - targetTime)) / 64;
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mWakeupLatency = min(mWakeupLatency, kMaxWakeupLatency);
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if (kTraceDetailedInfo) {
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ATRACE_INT64("DispSync:WakeupLat", now - targetTime);
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ATRACE_INT64("DispSync:AvgWakeupLat", mWakeupLatency);
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}
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}
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callbackInvocations = gatherCallbackInvocationsLocked(now);
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}
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if (callbackInvocations.size() > 0) {
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fireCallbackInvocations(callbackInvocations);
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}
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}
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return false;
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}
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status_t addEventListener(const char* name, nsecs_t phase,
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const sp<DispSync::Callback>& callback) {
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if (kTraceDetailedInfo) ATRACE_CALL();
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Mutex::Autolock lock(mMutex);
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for (size_t i = 0; i < mEventListeners.size(); i++) {
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if (mEventListeners[i].mCallback == callback) {
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return BAD_VALUE;
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}
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}
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EventListener listener;
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listener.mName = name;
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listener.mPhase = phase;
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listener.mCallback = callback;
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// We want to allow the firstmost future event to fire without
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// allowing any past events to fire
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listener.mLastEventTime = systemTime() - mPeriod / 2 + mPhase -
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mWakeupLatency;
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mEventListeners.push(listener);
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mCond.signal();
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return NO_ERROR;
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}
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status_t removeEventListener(const sp<DispSync::Callback>& callback) {
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if (kTraceDetailedInfo) ATRACE_CALL();
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Mutex::Autolock lock(mMutex);
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for (size_t i = 0; i < mEventListeners.size(); i++) {
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if (mEventListeners[i].mCallback == callback) {
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mEventListeners.removeAt(i);
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mCond.signal();
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return NO_ERROR;
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}
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}
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return BAD_VALUE;
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}
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// This method is only here to handle the kIgnorePresentFences case.
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bool hasAnyEventListeners() {
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if (kTraceDetailedInfo) ATRACE_CALL();
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Mutex::Autolock lock(mMutex);
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return !mEventListeners.empty();
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}
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private:
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struct EventListener {
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const char* mName;
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nsecs_t mPhase;
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nsecs_t mLastEventTime;
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sp<DispSync::Callback> mCallback;
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};
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struct CallbackInvocation {
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sp<DispSync::Callback> mCallback;
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nsecs_t mEventTime;
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};
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nsecs_t computeNextEventTimeLocked(nsecs_t now) {
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if (kTraceDetailedInfo) ATRACE_CALL();
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ALOGV("[%s] computeNextEventTimeLocked", mName);
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nsecs_t nextEventTime = INT64_MAX;
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for (size_t i = 0; i < mEventListeners.size(); i++) {
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nsecs_t t = computeListenerNextEventTimeLocked(mEventListeners[i],
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now);
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if (t < nextEventTime) {
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nextEventTime = t;
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}
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}
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ALOGV("[%s] nextEventTime = %" PRId64, mName, ns2us(nextEventTime));
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return nextEventTime;
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}
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Vector<CallbackInvocation> gatherCallbackInvocationsLocked(nsecs_t now) {
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if (kTraceDetailedInfo) ATRACE_CALL();
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ALOGV("[%s] gatherCallbackInvocationsLocked @ %" PRId64, mName,
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ns2us(now));
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Vector<CallbackInvocation> callbackInvocations;
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nsecs_t onePeriodAgo = now - mPeriod;
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for (size_t i = 0; i < mEventListeners.size(); i++) {
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nsecs_t t = computeListenerNextEventTimeLocked(mEventListeners[i],
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onePeriodAgo);
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if (t < now) {
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CallbackInvocation ci;
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ci.mCallback = mEventListeners[i].mCallback;
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ci.mEventTime = t;
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ALOGV("[%s] [%s] Preparing to fire", mName,
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mEventListeners[i].mName);
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callbackInvocations.push(ci);
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mEventListeners.editItemAt(i).mLastEventTime = t;
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}
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}
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return callbackInvocations;
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}
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nsecs_t computeListenerNextEventTimeLocked(const EventListener& listener,
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nsecs_t baseTime) {
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if (kTraceDetailedInfo) ATRACE_CALL();
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ALOGV("[%s] [%s] computeListenerNextEventTimeLocked(%" PRId64 ")",
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mName, listener.mName, ns2us(baseTime));
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nsecs_t lastEventTime = listener.mLastEventTime + mWakeupLatency;
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ALOGV("[%s] lastEventTime: %" PRId64, mName, ns2us(lastEventTime));
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if (baseTime < lastEventTime) {
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baseTime = lastEventTime;
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ALOGV("[%s] Clamping baseTime to lastEventTime -> %" PRId64, mName,
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ns2us(baseTime));
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}
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baseTime -= mReferenceTime;
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ALOGV("[%s] Relative baseTime = %" PRId64, mName, ns2us(baseTime));
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nsecs_t phase = mPhase + listener.mPhase;
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ALOGV("[%s] Phase = %" PRId64, mName, ns2us(phase));
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baseTime -= phase;
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ALOGV("[%s] baseTime - phase = %" PRId64, mName, ns2us(baseTime));
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// If our previous time is before the reference (because the reference
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// has since been updated), the division by mPeriod will truncate
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// towards zero instead of computing the floor. Since in all cases
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// before the reference we want the next time to be effectively now, we
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// set baseTime to -mPeriod so that numPeriods will be -1.
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// When we add 1 and the phase, we will be at the correct event time for
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// this period.
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if (baseTime < 0) {
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ALOGV("[%s] Correcting negative baseTime", mName);
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baseTime = -mPeriod;
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}
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nsecs_t numPeriods = baseTime / mPeriod;
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ALOGV("[%s] numPeriods = %" PRId64, mName, numPeriods);
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nsecs_t t = (numPeriods + 1) * mPeriod + phase;
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ALOGV("[%s] t = %" PRId64, mName, ns2us(t));
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t += mReferenceTime;
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ALOGV("[%s] Absolute t = %" PRId64, mName, ns2us(t));
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// Check that it's been slightly more than half a period since the last
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// event so that we don't accidentally fall into double-rate vsyncs
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if (t - listener.mLastEventTime < (3 * mPeriod / 5)) {
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t += mPeriod;
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ALOGV("[%s] Modifying t -> %" PRId64, mName, ns2us(t));
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}
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t -= mWakeupLatency;
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ALOGV("[%s] Corrected for wakeup latency -> %" PRId64, mName, ns2us(t));
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return t;
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}
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void fireCallbackInvocations(const Vector<CallbackInvocation>& callbacks) {
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if (kTraceDetailedInfo) ATRACE_CALL();
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for (size_t i = 0; i < callbacks.size(); i++) {
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callbacks[i].mCallback->onDispSyncEvent(callbacks[i].mEventTime);
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}
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}
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const char* const mName;
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bool mStop;
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nsecs_t mPeriod;
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nsecs_t mPhase;
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nsecs_t mReferenceTime;
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nsecs_t mWakeupLatency;
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int64_t mFrameNumber;
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Vector<EventListener> mEventListeners;
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Mutex mMutex;
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Condition mCond;
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};
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#undef LOG_TAG
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#define LOG_TAG "DispSync"
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class ZeroPhaseTracer : public DispSync::Callback {
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public:
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ZeroPhaseTracer() : mParity(false) {}
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virtual void onDispSyncEvent(nsecs_t /*when*/) {
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mParity = !mParity;
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ATRACE_INT("ZERO_PHASE_VSYNC", mParity ? 1 : 0);
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}
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private:
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bool mParity;
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};
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DispSync::DispSync(const char* name) :
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mName(name),
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mRefreshSkipCount(0),
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mThread(new DispSyncThread(name)) {
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mThread->run("DispSync", PRIORITY_URGENT_DISPLAY + PRIORITY_MORE_FAVORABLE);
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// set DispSync to SCHED_FIFO to minimize jitter
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struct sched_param param = {0};
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param.sched_priority = 2;
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if (sched_setscheduler(mThread->getTid(), SCHED_FIFO, ¶m) != 0) {
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ALOGE("Couldn't set SCHED_FIFO for DispSyncThread");
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}
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android_set_rt_ioprio(mThread->getTid(), 1);
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reset();
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beginResync();
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if (kTraceDetailedInfo) {
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// If we're not getting present fences then the ZeroPhaseTracer
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// would prevent HW vsync event from ever being turned off.
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// Even if we're just ignoring the fences, the zero-phase tracing is
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// not needed because any time there is an event registered we will
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// turn on the HW vsync events.
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if (!kIgnorePresentFences && kEnableZeroPhaseTracer) {
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addEventListener("ZeroPhaseTracer", 0, new ZeroPhaseTracer());
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}
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}
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}
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DispSync::~DispSync() {}
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void DispSync::reset() {
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Mutex::Autolock lock(mMutex);
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mPhase = 0;
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mReferenceTime = 0;
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mModelUpdated = false;
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mNumResyncSamples = 0;
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mFirstResyncSample = 0;
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mNumResyncSamplesSincePresent = 0;
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#ifdef HH_VSYNC_ISSUE
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mNumPresentWithoutResyncSamples = 0;
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#endif
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resetErrorLocked();
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}
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bool DispSync::addPresentFence(const sp<Fence>& fence) {
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Mutex::Autolock lock(mMutex);
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mPresentFences[mPresentSampleOffset] = fence;
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mPresentTimes[mPresentSampleOffset] = 0;
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mPresentSampleOffset = (mPresentSampleOffset + 1) % NUM_PRESENT_SAMPLES;
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mNumResyncSamplesSincePresent = 0;
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for (size_t i = 0; i < NUM_PRESENT_SAMPLES; i++) {
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const sp<Fence>& f(mPresentFences[i]);
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if (f != NULL) {
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nsecs_t t = f->getSignalTime();
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if (t < INT64_MAX) {
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mPresentFences[i].clear();
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mPresentTimes[i] = t + kPresentTimeOffset;
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}
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}
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}
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updateErrorLocked();
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#ifdef HH_VSYNC_ISSUE
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// This is a workaround for b/25845510.
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// If we have no resync samples after many presents, something is wrong with
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// HW vsync. Tell SF to disable HW vsync now and re-enable it next time.
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if (mNumResyncSamples == 0 &&
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mNumPresentWithoutResyncSamples++ > MAX_PRESENT_WITHOUT_RESYNC_SAMPLES) {
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mNumPresentWithoutResyncSamples = 0;
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return false;
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}
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#endif
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return !mModelUpdated || mError > kErrorThreshold;
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}
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void DispSync::beginResync() {
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Mutex::Autolock lock(mMutex);
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ALOGV("[%s] beginResync", mName);
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mModelUpdated = false;
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mNumResyncSamples = 0;
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#ifdef HH_VSYNC_ISSUE
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mNumPresentWithoutResyncSamples = 0;
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#endif
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}
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bool DispSync::addResyncSample(nsecs_t timestamp) {
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Mutex::Autolock lock(mMutex);
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ALOGV("[%s] addResyncSample(%" PRId64 ")", mName, ns2us(timestamp));
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size_t idx = (mFirstResyncSample + mNumResyncSamples) % MAX_RESYNC_SAMPLES;
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mResyncSamples[idx] = timestamp;
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if (mNumResyncSamples == 0) {
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mPhase = 0;
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mReferenceTime = timestamp;
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ALOGV("[%s] First resync sample: mPeriod = %" PRId64 ", mPhase = 0, "
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"mReferenceTime = %" PRId64, mName, ns2us(mPeriod),
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ns2us(mReferenceTime));
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mThread->updateModel(mPeriod, mPhase, mReferenceTime);
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}
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if (mNumResyncSamples < MAX_RESYNC_SAMPLES) {
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mNumResyncSamples++;
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} else {
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mFirstResyncSample = (mFirstResyncSample + 1) % MAX_RESYNC_SAMPLES;
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}
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updateModelLocked();
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if (mNumResyncSamplesSincePresent++ > MAX_RESYNC_SAMPLES_WITHOUT_PRESENT) {
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resetErrorLocked();
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}
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if (kIgnorePresentFences) {
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// If we don't have the sync framework we will never have
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// addPresentFence called. This means we have no way to know whether
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// or not we're synchronized with the HW vsyncs, so we just request
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// that the HW vsync events be turned on whenever we need to generate
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// SW vsync events.
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return mThread->hasAnyEventListeners();
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}
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// Check against kErrorThreshold / 2 to add some hysteresis before having to
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// resync again
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bool modelLocked = mModelUpdated && mError < (kErrorThreshold / 2);
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ALOGV("[%s] addResyncSample returning %s", mName,
|
|
modelLocked ? "locked" : "unlocked");
|
|
return !modelLocked;
|
|
}
|
|
|
|
void DispSync::endResync() {
|
|
}
|
|
|
|
status_t DispSync::addEventListener(const char* name, nsecs_t phase,
|
|
const sp<Callback>& callback) {
|
|
Mutex::Autolock lock(mMutex);
|
|
return mThread->addEventListener(name, phase, callback);
|
|
}
|
|
|
|
void DispSync::setRefreshSkipCount(int count) {
|
|
Mutex::Autolock lock(mMutex);
|
|
ALOGD("setRefreshSkipCount(%d)", count);
|
|
mRefreshSkipCount = count;
|
|
updateModelLocked();
|
|
}
|
|
|
|
status_t DispSync::removeEventListener(const sp<Callback>& callback) {
|
|
Mutex::Autolock lock(mMutex);
|
|
return mThread->removeEventListener(callback);
|
|
}
|
|
|
|
void DispSync::setPeriod(nsecs_t period) {
|
|
Mutex::Autolock lock(mMutex);
|
|
mPeriod = period;
|
|
mPhase = 0;
|
|
mReferenceTime = 0;
|
|
mThread->updateModel(mPeriod, mPhase, mReferenceTime);
|
|
}
|
|
|
|
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;
|
|
for (size_t i = 1; 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 - 3);
|
|
|
|
ALOGV("[%s] mPeriod = %" PRId64, mName, ns2us(mPeriod));
|
|
|
|
double sampleAvgX = 0;
|
|
double sampleAvgY = 0;
|
|
double scale = 2.0 * M_PI / double(mPeriod);
|
|
// Intentionally skip the first sample
|
|
for (size_t i = 1; 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 - 1);
|
|
sampleAvgY /= double(mNumResyncSamples - 1);
|
|
|
|
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));
|
|
}
|
|
|
|
if (kTraceDetailedInfo) {
|
|
ATRACE_INT64("DispSync:Period", mPeriod);
|
|
ATRACE_INT64("DispSync:Phase", mPhase + mPeriod / 2);
|
|
}
|
|
|
|
// Artificially inflate the period if requested.
|
|
mPeriod += mPeriod * mRefreshSkipCount;
|
|
|
|
mThread->updateModel(mPeriod, mPhase, mReferenceTime);
|
|
mModelUpdated = true;
|
|
}
|
|
}
|
|
|
|
void DispSync::updateErrorLocked() {
|
|
if (!mModelUpdated) {
|
|
return;
|
|
}
|
|
|
|
// Need to compare present fences against the un-adjusted refresh period,
|
|
// since they might arrive between two events.
|
|
nsecs_t period = mPeriod / (1 + mRefreshSkipCount);
|
|
|
|
int numErrSamples = 0;
|
|
nsecs_t sqErrSum = 0;
|
|
|
|
for (size_t i = 0; i < NUM_PRESENT_SAMPLES; i++) {
|
|
nsecs_t sample = mPresentTimes[i] - mReferenceTime;
|
|
if (sample > mPhase) {
|
|
nsecs_t sampleErr = (sample - mPhase) % period;
|
|
if (sampleErr > period / 2) {
|
|
sampleErr -= period;
|
|
}
|
|
sqErrSum += sampleErr * sampleErr;
|
|
numErrSamples++;
|
|
}
|
|
}
|
|
|
|
if (numErrSamples > 0) {
|
|
mError = sqErrSum / numErrSamples;
|
|
} else {
|
|
mError = 0;
|
|
}
|
|
|
|
if (kTraceDetailedInfo) {
|
|
ATRACE_INT64("DispSync:Error", mError);
|
|
}
|
|
}
|
|
|
|
void DispSync::resetErrorLocked() {
|
|
mPresentSampleOffset = 0;
|
|
mError = 0;
|
|
for (size_t i = 0; i < NUM_PRESENT_SAMPLES; i++) {
|
|
mPresentFences[i].clear();
|
|
mPresentTimes[i] = 0;
|
|
}
|
|
}
|
|
|
|
nsecs_t DispSync::computeNextRefresh(int periodOffset) const {
|
|
Mutex::Autolock lock(mMutex);
|
|
nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);
|
|
nsecs_t phase = mReferenceTime + mPhase;
|
|
return (((now - phase) / mPeriod) + periodOffset + 1) * mPeriod + phase;
|
|
}
|
|
|
|
void DispSync::dump(String8& result) const {
|
|
Mutex::Autolock lock(mMutex);
|
|
result.appendFormat("present fences are %s\n",
|
|
kIgnorePresentFences ? "ignored" : "used");
|
|
result.appendFormat("mPeriod: %" PRId64 " ns (%.3f fps; skipCount=%d)\n",
|
|
mPeriod, 1000000000.0 / mPeriod, mRefreshSkipCount);
|
|
result.appendFormat("mPhase: %" PRId64 " ns\n", mPhase);
|
|
result.appendFormat("mError: %" PRId64 " ns (sqrt=%.1f)\n",
|
|
mError, sqrt(mError));
|
|
result.appendFormat("mNumResyncSamplesSincePresent: %d (limit %d)\n",
|
|
mNumResyncSamplesSincePresent, MAX_RESYNC_SAMPLES_WITHOUT_PRESENT);
|
|
result.appendFormat("mNumResyncSamples: %zd (max %d)\n",
|
|
mNumResyncSamples, MAX_RESYNC_SAMPLES);
|
|
|
|
result.appendFormat("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) {
|
|
result.appendFormat(" %" PRId64 "\n", sampleTime);
|
|
} else {
|
|
result.appendFormat(" %" PRId64 " (+%" PRId64 ")\n",
|
|
sampleTime, sampleTime - previous);
|
|
}
|
|
previous = sampleTime;
|
|
}
|
|
|
|
result.appendFormat("mPresentFences / mPresentTimes [%d]:\n",
|
|
NUM_PRESENT_SAMPLES);
|
|
nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);
|
|
previous = 0;
|
|
for (size_t i = 0; i < NUM_PRESENT_SAMPLES; i++) {
|
|
size_t idx = (i + mPresentSampleOffset) % NUM_PRESENT_SAMPLES;
|
|
bool signaled = mPresentFences[idx] == NULL;
|
|
nsecs_t presentTime = mPresentTimes[idx];
|
|
if (!signaled) {
|
|
result.appendFormat(" [unsignaled fence]\n");
|
|
} else if (presentTime == 0) {
|
|
result.appendFormat(" 0\n");
|
|
} else if (previous == 0) {
|
|
result.appendFormat(" %" PRId64 " (%.3f ms ago)\n", presentTime,
|
|
(now - presentTime) / 1000000.0);
|
|
} else {
|
|
result.appendFormat(" %" PRId64 " (+%" PRId64 " / %.3f) (%.3f ms ago)\n",
|
|
presentTime, presentTime - previous,
|
|
(presentTime - previous) / (double) mPeriod,
|
|
(now - presentTime) / 1000000.0);
|
|
}
|
|
previous = presentTime;
|
|
}
|
|
|
|
result.appendFormat("current monotonic time: %" PRId64 "\n", now);
|
|
}
|
|
|
|
} // namespace android
|