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/*
* Copyright 2019 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.
*/
#define ATRACE_TAG ATRACE_TAG_GRAPHICS
#undef LOG_TAG
#define LOG_TAG "VSyncReactor"
//#define LOG_NDEBUG 0
#include "VSyncReactor.h"
#include <cutils/properties.h>
#include <log/log.h>
#include <utils/Trace.h>
#include "../TracedOrdinal.h"
#include "TimeKeeper.h"
#include "VSyncDispatch.h"
#include "VSyncTracker.h"
namespace android::scheduler {
using base::StringAppendF;
VsyncController::~VsyncController() = default;
Clock::~Clock() = default;
nsecs_t SystemClock::now() const {
return systemTime(SYSTEM_TIME_MONOTONIC);
}
VSyncReactor::VSyncReactor(std::unique_ptr<Clock> clock, VSyncTracker& tracker,
size_t pendingFenceLimit, bool supportKernelIdleTimer)
: mClock(std::move(clock)),
mTracker(tracker),
mPendingLimit(pendingFenceLimit),
mSupportKernelIdleTimer(supportKernelIdleTimer) {}
VSyncReactor::~VSyncReactor() = default;
bool VSyncReactor::addPresentFence(const std::shared_ptr<android::FenceTime>& fence) {
if (!fence) {
return false;
}
nsecs_t const signalTime = fence->getCachedSignalTime();
if (signalTime == Fence::SIGNAL_TIME_INVALID) {
return true;
}
std::lock_guard lock(mMutex);
if (mExternalIgnoreFences || mInternalIgnoreFences) {
return true;
}
bool timestampAccepted = true;
for (auto it = mUnfiredFences.begin(); it != mUnfiredFences.end();) {
auto const time = (*it)->getCachedSignalTime();
if (time == Fence::SIGNAL_TIME_PENDING) {
it++;
} else if (time == Fence::SIGNAL_TIME_INVALID) {
it = mUnfiredFences.erase(it);
} else {
timestampAccepted &= mTracker.addVsyncTimestamp(time);
it = mUnfiredFences.erase(it);
}
}
if (signalTime == Fence::SIGNAL_TIME_PENDING) {
if (mPendingLimit == mUnfiredFences.size()) {
mUnfiredFences.erase(mUnfiredFences.begin());
}
mUnfiredFences.push_back(fence);
} else {
timestampAccepted &= mTracker.addVsyncTimestamp(signalTime);
}
if (!timestampAccepted) {
mMoreSamplesNeeded = true;
setIgnorePresentFencesInternal(true);
mPeriodConfirmationInProgress = true;
}
return mMoreSamplesNeeded;
}
void VSyncReactor::setIgnorePresentFences(bool ignore) {
std::lock_guard lock(mMutex);
mExternalIgnoreFences = ignore;
updateIgnorePresentFencesInternal();
}
void VSyncReactor::setIgnorePresentFencesInternal(bool ignore) {
mInternalIgnoreFences = ignore;
updateIgnorePresentFencesInternal();
}
void VSyncReactor::updateIgnorePresentFencesInternal() {
if (mExternalIgnoreFences || mInternalIgnoreFences) {
mUnfiredFences.clear();
}
}
void VSyncReactor::startPeriodTransitionInternal(nsecs_t newPeriod) {
ATRACE_CALL();
mPeriodConfirmationInProgress = true;
mPeriodTransitioningTo = newPeriod;
mMoreSamplesNeeded = true;
setIgnorePresentFencesInternal(true);
}
void VSyncReactor::endPeriodTransition() {
ATRACE_CALL();
mPeriodTransitioningTo.reset();
mPeriodConfirmationInProgress = false;
mLastHwVsync.reset();
}
void VSyncReactor::startPeriodTransition(nsecs_t period) {
ATRACE_INT64("VSR-setPeriod", period);
std::lock_guard lock(mMutex);
mLastHwVsync.reset();
if (!mSupportKernelIdleTimer && period == mTracker.currentPeriod()) {
endPeriodTransition();
setIgnorePresentFencesInternal(false);
mMoreSamplesNeeded = false;
} else {
startPeriodTransitionInternal(period);
}
}
bool VSyncReactor::periodConfirmed(nsecs_t vsync_timestamp, std::optional<nsecs_t> HwcVsyncPeriod) {
if (!mPeriodConfirmationInProgress) {
return false;
}
if (!mLastHwVsync && !HwcVsyncPeriod) {
return false;
}
const bool periodIsChanging =
mPeriodTransitioningTo && (*mPeriodTransitioningTo != mTracker.currentPeriod());
if (mSupportKernelIdleTimer && !periodIsChanging) {
// Clear out the Composer-provided period and use the allowance logic below
HwcVsyncPeriod = {};
}
auto const period = mPeriodTransitioningTo ? *mPeriodTransitioningTo : mTracker.currentPeriod();
static constexpr int allowancePercent = 10;
static constexpr std::ratio<allowancePercent, 100> allowancePercentRatio;
auto const allowance = period * allowancePercentRatio.num / allowancePercentRatio.den;
if (HwcVsyncPeriod) {
return std::abs(*HwcVsyncPeriod - period) < allowance;
}
auto const distance = vsync_timestamp - *mLastHwVsync;
return std::abs(distance - period) < allowance;
}
bool VSyncReactor::addHwVsyncTimestamp(nsecs_t timestamp, std::optional<nsecs_t> hwcVsyncPeriod,
bool* periodFlushed) {
assert(periodFlushed);
std::lock_guard lock(mMutex);
if (periodConfirmed(timestamp, hwcVsyncPeriod)) {
ATRACE_NAME("VSR: period confirmed");
if (mPeriodTransitioningTo) {
mTracker.setPeriod(*mPeriodTransitioningTo);
*periodFlushed = true;
}
if (mLastHwVsync) {
mTracker.addVsyncTimestamp(*mLastHwVsync);
}
mTracker.addVsyncTimestamp(timestamp);
endPeriodTransition();
mMoreSamplesNeeded = mTracker.needsMoreSamples();
} else if (mPeriodConfirmationInProgress) {
ATRACE_NAME("VSR: still confirming period");
mLastHwVsync = timestamp;
mMoreSamplesNeeded = true;
*periodFlushed = false;
} else {
ATRACE_NAME("VSR: adding sample");
*periodFlushed = false;
mTracker.addVsyncTimestamp(timestamp);
mMoreSamplesNeeded = mTracker.needsMoreSamples();
}
if (!mMoreSamplesNeeded) {
setIgnorePresentFencesInternal(false);
}
return mMoreSamplesNeeded;
}
void VSyncReactor::dump(std::string& result) const {
std::lock_guard lock(mMutex);
StringAppendF(&result, "VsyncReactor in use\n");
StringAppendF(&result, "Has %zu unfired fences\n", mUnfiredFences.size());
StringAppendF(&result, "mInternalIgnoreFences=%d mExternalIgnoreFences=%d\n",
mInternalIgnoreFences, mExternalIgnoreFences);
StringAppendF(&result, "mMoreSamplesNeeded=%d mPeriodConfirmationInProgress=%d\n",
mMoreSamplesNeeded, mPeriodConfirmationInProgress);
if (mPeriodTransitioningTo) {
StringAppendF(&result, "mPeriodTransitioningTo=%" PRId64 "\n", *mPeriodTransitioningTo);
} else {
StringAppendF(&result, "mPeriodTransitioningTo=nullptr\n");
}
if (mLastHwVsync) {
StringAppendF(&result, "Last HW vsync was %.2fms ago\n",
(mClock->now() - *mLastHwVsync) / 1e6f);
} else {
StringAppendF(&result, "No Last HW vsync\n");
}
StringAppendF(&result, "VSyncTracker:\n");
mTracker.dump(result);
}
} // namespace android::scheduler
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