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/*
* Copyright 2025 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 LOG_NDEBUG 0
#undef LOG_TAG
#define LOG_TAG "DependencyMonitor"
#include <ui/DependencyMonitor.h>
#include <ui/Fence.h>
#include <utils/Timers.h>
#include <inttypes.h>
namespace android {
void DependencyMonitor::addIngress(FenceTimePtr fence, std::string annotation) {
std::lock_guard lock(mMutex);
resolveLocked();
if (mDependencies.isFull() && !mDependencies.front().updateSignalTimes(true)) {
ALOGD("%s: Clobbering unresolved dependencies -- make me bigger!", mToken.c_str());
}
auto& entry = mDependencies.next();
entry.reset(mToken.c_str());
ALOGV("%" PRId64 "/%s: addIngress at CPU time %" PRId64 " (%s)", mDependencies.back().id,
mToken.c_str(), systemTime(), annotation.c_str());
mDependencies.back().ingress = {std::move(fence), std::move(annotation)};
}
void DependencyMonitor::addAccessCompletion(FenceTimePtr fence, std::string annotation) {
std::lock_guard lock(mMutex);
if (mDependencies.size() == 0) {
return;
}
ALOGV("%" PRId64 "/%s: addAccessCompletion at CPU time %" PRId64 " (%s)",
mDependencies.back().id, mToken.c_str(), systemTime(), annotation.c_str());
mDependencies.back().accessCompletions.emplace_back(std::move(fence), std::move(annotation));
}
void DependencyMonitor::addEgress(FenceTimePtr fence, std::string annotation) {
std::lock_guard lock(mMutex);
if (mDependencies.size() == 0) {
return;
}
ALOGV("%" PRId64 "/%s: addEgress at CPU time %" PRId64 " (%s)", mDependencies.back().id,
mToken.c_str(), systemTime(), annotation.c_str());
mDependencies.back().egress = {std::move(fence), std::move(annotation)};
}
void DependencyMonitor::resolveLocked() {
if (mDependencies.size() == 0) {
return;
}
for (size_t i = mDependencies.size(); i > 0; i--) {
auto& dependencyBlock = mDependencies[i - 1];
if (dependencyBlock.validated) {
continue;
}
if (!dependencyBlock.updateSignalTimes(false)) {
break;
}
dependencyBlock.validated = true;
dependencyBlock.checkUnsafeAccess();
}
}
bool DependencyMonitor::DependencyBlock::updateSignalTimes(bool excludeIngress) {
if (egress.fence->getSignalTime() == Fence::SIGNAL_TIME_PENDING) {
return false;
}
if (!excludeIngress && ingress.fence->getSignalTime() == Fence::SIGNAL_TIME_PENDING) {
return false;
}
for (auto& accessCompletion : accessCompletions) {
if (accessCompletion.fence->getSignalTime() == Fence::SIGNAL_TIME_PENDING) {
return false;
}
}
return true;
}
void DependencyMonitor::DependencyBlock::checkUnsafeAccess() const {
const nsecs_t egressTime = egress.fence->getCachedSignalTime();
const nsecs_t ingressTime = ingress.fence->getCachedSignalTime();
ALOGV_IF(egressTime != Fence::SIGNAL_TIME_INVALID,
"%" PRId64 "/%s: Egress time: %" PRId64 " (%s)", token, id, egressTime,
egress.annotation.c_str());
ALOGV_IF(Fence::isValidTimestamp(egressTime) && Fence::isValidTimestamp(ingressTime) &&
egressTime < ingressTime,
"%" PRId64 "/%s: Detected egress before ingress!: %" PRId64 " (%s) < %" PRId64 " (%s)",
id, token, egressTime, egress.annotation, ingressTime, ingress.annotation.c_str());
for (auto& accessCompletion : accessCompletions) {
const nsecs_t accessCompletionTime = accessCompletion.fence->getCachedSignalTime();
if (!Fence::isValidTimestamp(accessCompletionTime)) {
ALOGI("%" PRId64 "/%s: Detected invalid access completion! <%s>", id, token,
accessCompletion.annotation.c_str());
continue;
} else {
ALOGV("%" PRId64 "/%s: Access completion time: %" PRId64 " <%s>", id, token,
accessCompletionTime, accessCompletion.annotation.c_str());
}
ALOGI_IF(Fence::isValidTimestamp(egressTime) && accessCompletionTime > egressTime,
"%" PRId64 "/%s: Detected access completion after egress!: %" PRId64
" (%s) > %" PRId64 " (%s)",
id, token, accessCompletionTime, accessCompletion.annotation.c_str(), egressTime,
egress.annotation.c_str());
ALOGI_IF(Fence::isValidTimestamp(ingressTime) && accessCompletionTime < ingressTime,
"%" PRId64 "/%s: Detected access completion prior to ingress!: %" PRId64
" (%s) < %" PRId64 " (%s)",
id, token, accessCompletionTime, accessCompletion.annotation.c_str(), ingressTime,
ingress.annotation.c_str());
}
ALOGV_IF(ingressTime != Fence::SIGNAL_TIME_INVALID,
"%" PRId64 "/%s: Ingress time: %" PRId64 " (%s)", id, token, ingressTime,
ingress.annotation.c_str());
}
} // namespace android
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