| /* |
| * Copyright 2022 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. |
| */ |
| |
| #include "VsyncThread.h" |
| |
| #include <utils/ThreadDefs.h> |
| |
| #include <thread> |
| |
| #include "Time.h" |
| |
| namespace aidl::android::hardware::graphics::composer3::impl { |
| namespace { |
| |
| // Returns the timepoint of the next vsync after the 'now' timepoint that is |
| // a multiple of 'vsyncPeriod' in-phase/offset-from 'previousSync'. |
| // |
| // Some examples: |
| // * vsyncPeriod=50ns previousVsync=500ns now=510ns => 550ns |
| // * vsyncPeriod=50ns previousVsync=300ns now=510ns => 550ns |
| // * vsyncPeriod=50ns previousVsync=500ns now=550ns => 550ns |
| TimePoint GetNextVsyncInPhase(Nanoseconds vsyncPeriod, TimePoint previousVsync, |
| TimePoint now) { |
| const auto elapsed = Nanoseconds(now - previousVsync); |
| const auto nextMultiple = (elapsed / vsyncPeriod) + 1; |
| return previousVsync + (nextMultiple * vsyncPeriod); |
| } |
| |
| } // namespace |
| |
| VsyncThread::VsyncThread(int64_t displayId) : mDisplayId(displayId) { |
| mPreviousVsync = std::chrono::steady_clock::now() - mVsyncPeriod; |
| } |
| |
| VsyncThread::~VsyncThread() { stop(); } |
| |
| HWC3::Error VsyncThread::start(int32_t vsyncPeriodNanos) { |
| DEBUG_LOG("%s for display:%" PRIu64, __FUNCTION__, mDisplayId); |
| |
| mVsyncPeriod = Nanoseconds(vsyncPeriodNanos); |
| |
| mThread = std::thread([this]() { threadLoop(); }); |
| |
| const std::string name = |
| "display_" + std::to_string(mDisplayId) + "_vsync_thread"; |
| |
| int ret = pthread_setname_np(mThread.native_handle(), name.c_str()); |
| if (ret != 0) { |
| ALOGE("%s: failed to set Vsync thread name: %s", __FUNCTION__, |
| strerror(ret)); |
| } |
| |
| struct sched_param param = { |
| .sched_priority = ANDROID_PRIORITY_DISPLAY, |
| }; |
| ret = pthread_setschedparam(mThread.native_handle(), SCHED_FIFO, ¶m); |
| if (ret != 0) { |
| ALOGE("%s: failed to set Vsync thread priority: %s", __FUNCTION__, |
| strerror(ret)); |
| } |
| |
| return HWC3::Error::None; |
| } |
| |
| HWC3::Error VsyncThread::stop() { |
| mShuttingDown.store(true); |
| mThread.join(); |
| |
| return HWC3::Error::None; |
| } |
| |
| HWC3::Error VsyncThread::setCallbacks( |
| const std::shared_ptr<IComposerCallback>& callback) { |
| DEBUG_LOG("%s for display:%" PRIu64, __FUNCTION__, mDisplayId); |
| |
| std::unique_lock<std::mutex> lock(mStateMutex); |
| |
| mCallbacks = callback; |
| |
| return HWC3::Error::None; |
| } |
| |
| HWC3::Error VsyncThread::setVsyncEnabled(bool enabled) { |
| DEBUG_LOG("%s for display:%" PRIu64 " enabled:%d", __FUNCTION__, mDisplayId, |
| enabled); |
| |
| std::unique_lock<std::mutex> lock(mStateMutex); |
| |
| mVsyncEnabled = enabled; |
| |
| return HWC3::Error::None; |
| } |
| |
| HWC3::Error VsyncThread::scheduleVsyncUpdate( |
| int32_t newVsyncPeriod, const VsyncPeriodChangeConstraints& constraints, |
| VsyncPeriodChangeTimeline* outTimeline) { |
| DEBUG_LOG("%s for display:%" PRIu64, __FUNCTION__, mDisplayId); |
| |
| PendingUpdate update; |
| update.period = Nanoseconds(newVsyncPeriod); |
| update.updateAfter = asTimePoint(constraints.desiredTimeNanos); |
| |
| std::unique_lock<std::mutex> lock(mStateMutex); |
| mPendingUpdate.emplace(std::move(update)); |
| |
| TimePoint nextVsync = |
| GetNextVsyncInPhase(mVsyncPeriod, mPreviousVsync, update.updateAfter); |
| |
| outTimeline->newVsyncAppliedTimeNanos = asNanosTimePoint(nextVsync); |
| outTimeline->refreshRequired = false; |
| outTimeline->refreshTimeNanos = 0; |
| |
| return HWC3::Error::None; |
| } |
| |
| Nanoseconds VsyncThread::updateVsyncPeriodLocked(TimePoint now) { |
| if (mPendingUpdate && now > mPendingUpdate->updateAfter) { |
| mVsyncPeriod = mPendingUpdate->period; |
| mPendingUpdate.reset(); |
| } |
| |
| return mVsyncPeriod; |
| } |
| |
| void VsyncThread::threadLoop() { |
| ALOGI("Vsync thread for display:%" PRId64 " starting", mDisplayId); |
| |
| Nanoseconds vsyncPeriod = mVsyncPeriod; |
| |
| int vsyncs = 0; |
| TimePoint previousLog = std::chrono::steady_clock::now(); |
| |
| while (!mShuttingDown.load()) { |
| TimePoint now = std::chrono::steady_clock::now(); |
| TimePoint nextVsync = GetNextVsyncInPhase(vsyncPeriod, mPreviousVsync, now); |
| |
| std::this_thread::sleep_until(nextVsync); |
| { |
| std::unique_lock<std::mutex> lock(mStateMutex); |
| |
| mPreviousVsync = nextVsync; |
| |
| // Display has finished refreshing at previous vsync period. Update the |
| // vsync period if there was a pending update. |
| vsyncPeriod = updateVsyncPeriodLocked(mPreviousVsync); |
| } |
| |
| if (mVsyncEnabled) { |
| if (mCallbacks) { |
| DEBUG_LOG("%s: for display:%" PRIu64 " calling vsync", __FUNCTION__, |
| mDisplayId); |
| mCallbacks->onVsync(mDisplayId, asNanosTimePoint(nextVsync), |
| asNanosDuration(vsyncPeriod)); |
| } |
| } |
| |
| static constexpr const int kLogIntervalSeconds = 60; |
| if (now > (previousLog + std::chrono::seconds(kLogIntervalSeconds))) { |
| DEBUG_LOG("%s: for display:%" PRIu64 " send %" PRIu32 |
| " in last %d seconds", |
| __FUNCTION__, mDisplayId, vsyncs, kLogIntervalSeconds); |
| previousLog = now; |
| vsyncs = 0; |
| } |
| ++vsyncs; |
| } |
| |
| ALOGI("Vsync thread for display:%" PRId64 " finished", mDisplayId); |
| } |
| |
| } // namespace aidl::android::hardware::graphics::composer3::impl |