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/*
* Copyright (C) 2012 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 <ui/Fence.h>
#define LOG_TAG "Fence"
#define ATRACE_TAG ATRACE_TAG_GRAPHICS
//#define LOG_NDEBUG 0
// We would eliminate the non-conforming zero-length array, but we can't since
// this is effectively included from the Linux kernel
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wzero-length-array"
#include <sync/sync.h>
#pragma clang diagnostic pop
#include <sys/types.h>
#include <unistd.h>
#include <utils/Log.h>
#include <utils/String8.h>
#include <utils/Trace.h>
namespace android {
const sp<Fence> Fence::NO_FENCE = sp<Fence>(new Fence);
Fence::Fence(int fenceFd) :
mFenceFd(fenceFd) {
}
Fence::Fence(base::unique_fd fenceFd) :
mFenceFd(std::move(fenceFd)) {
}
status_t Fence::wait(int timeout) {
ATRACE_CALL();
if (mFenceFd == -1) {
return NO_ERROR;
}
int err = sync_wait(mFenceFd, timeout);
return err < 0 ? -errno : status_t(NO_ERROR);
}
status_t Fence::waitForever(const char* logname) {
ATRACE_CALL();
if (mFenceFd == -1) {
return NO_ERROR;
}
int warningTimeout = 3000;
int err = sync_wait(mFenceFd, warningTimeout);
if (err < 0 && errno == ETIME) {
ALOGE("waitForever: %s: fence %d didn't signal in %u ms", logname, mFenceFd.get(),
warningTimeout);
struct sync_file_info* finfo = sync_file_info(mFenceFd);
if (finfo) {
// status: active(0) signaled(1) error(<0)
ALOGI("waitForever: fence(%s) status(%d)", finfo->name, finfo->status);
struct sync_fence_info* pinfo = sync_get_fence_info(finfo);
for (uint32_t i = 0; i < finfo->num_fences; i++) {
uint64_t ts_sec = pinfo[i].timestamp_ns / 1000000000LL;
uint64_t ts_usec = (pinfo[i].timestamp_ns % 1000000000LL) / 1000LL;
ALOGI("waitForever: sync point: timeline(%s) drv(%s) status(%d) timestamp(%" PRIu64
".%06" PRIu64 ")",
pinfo[i].obj_name, pinfo[i].driver_name, pinfo[i].status, ts_sec, ts_usec);
}
sync_file_info_free(finfo);
}
err = sync_wait(mFenceFd, TIMEOUT_NEVER);
}
return err < 0 ? -errno : status_t(NO_ERROR);
}
sp<Fence> Fence::merge(const char* name, const sp<Fence>& f1,
const sp<Fence>& f2) {
ATRACE_CALL();
int result;
// Merge the two fences. In the case where one of the fences is not a
// valid fence (e.g. NO_FENCE) we merge the one valid fence with itself so
// that a new fence with the given name is created.
if (f1->isValid() && f2->isValid()) {
result = sync_merge(name, f1->mFenceFd, f2->mFenceFd);
} else if (f1->isValid()) {
result = sync_merge(name, f1->mFenceFd, f1->mFenceFd);
} else if (f2->isValid()) {
result = sync_merge(name, f2->mFenceFd, f2->mFenceFd);
} else {
return NO_FENCE;
}
if (result == -1) {
status_t err = -errno;
ALOGE("merge: sync_merge(\"%s\", %d, %d) returned an error: %s (%d)",
name, f1->mFenceFd.get(), f2->mFenceFd.get(),
strerror(-err), err);
return NO_FENCE;
}
return sp<Fence>(new Fence(result));
}
sp<Fence> Fence::merge(const String8& name, const sp<Fence>& f1,
const sp<Fence>& f2) {
return merge(name.c_str(), f1, f2);
}
int Fence::dup() const {
return ::dup(mFenceFd);
}
nsecs_t Fence::getSignalTime() const {
if (mFenceFd == -1) {
return SIGNAL_TIME_INVALID;
}
struct sync_file_info* finfo = sync_file_info(mFenceFd);
if (finfo == nullptr) {
ALOGE("sync_file_info returned NULL for fd %d", mFenceFd.get());
return SIGNAL_TIME_INVALID;
}
if (finfo->status != 1) {
const auto status = finfo->status;
ALOGE_IF(status < 0, "%s: sync_file_info contains an error: <%d> for fd: <%d>", __func__,
status, mFenceFd.get());
sync_file_info_free(finfo);
return status < 0 ? SIGNAL_TIME_INVALID : SIGNAL_TIME_PENDING;
}
uint64_t timestamp = 0;
struct sync_fence_info* pinfo = sync_get_fence_info(finfo);
for (size_t i = 0; i < finfo->num_fences; i++) {
if (pinfo[i].timestamp_ns > timestamp) {
timestamp = pinfo[i].timestamp_ns;
}
}
sync_file_info_free(finfo);
return nsecs_t(timestamp);
}
size_t Fence::getFlattenedSize() const {
return 4;
}
size_t Fence::getFdCount() const {
return isValid() ? 1 : 0;
}
status_t Fence::flatten(void*& buffer, size_t& size, int*& fds, size_t& count) const {
if (size < getFlattenedSize() || count < getFdCount()) {
return NO_MEMORY;
}
// Cast to uint32_t since the size of a size_t can vary between 32- and
// 64-bit processes
FlattenableUtils::write(buffer, size, static_cast<uint32_t>(getFdCount()));
if (isValid()) {
*fds++ = mFenceFd;
count--;
}
return NO_ERROR;
}
status_t Fence::unflatten(void const*& buffer, size_t& size, int const*& fds, size_t& count) {
if (mFenceFd != -1) {
// Don't unflatten if we already have a valid fd.
return INVALID_OPERATION;
}
if (size < getFlattenedSize()) {
return NO_MEMORY;
}
uint32_t numFds;
FlattenableUtils::read(buffer, size, numFds);
if (numFds > 1) {
return BAD_VALUE;
}
if (count < numFds) {
return NO_MEMORY;
}
if (numFds) {
mFenceFd.reset(*fds++);
count--;
}
return NO_ERROR;
}
} // namespace android
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