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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "SharedSurfacesParent.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/StaticPrefs_image.h"
#include "mozilla/gfx/Logging.h"
#include "mozilla/gfx/gfxVars.h"
#include "mozilla/gfx/GPUProcessManager.h"
#include "mozilla/layers/SharedSurfacesMemoryReport.h"
#include "mozilla/layers/SourceSurfaceSharedData.h"
#include "mozilla/layers/CompositorThread.h"
#include "mozilla/webrender/RenderSharedSurfaceTextureHost.h"
#include "mozilla/webrender/RenderThread.h"
#include "nsThreadUtils.h" // for GetCurrentEventTarget
namespace mozilla {
namespace layers {
using namespace mozilla::gfx;
StaticMonitor SharedSurfacesParent::sMonitor;
StaticAutoPtr<SharedSurfacesParent> SharedSurfacesParent::sInstance;
// Short wait to allow for a surface to be added, where the consumer has a
// different thread route.
static const TimeDuration kGetTimeout = TimeDuration::FromMilliseconds(50);
void SharedSurfacesParent::MappingTracker::NotifyExpiredLocked(
SourceSurfaceSharedDataWrapper* aSurface,
const StaticMonitorAutoLock& aAutoLock) {
RemoveObjectLocked(aSurface, aAutoLock);
mExpired.AppendElement(aSurface);
}
void SharedSurfacesParent::MappingTracker::TakeExpired(
nsTArray<RefPtr<gfx::SourceSurfaceSharedDataWrapper>>& aExpired,
const StaticMonitorAutoLock& aAutoLock) {
aExpired = std::move(mExpired);
}
void SharedSurfacesParent::MappingTracker::NotifyHandlerEnd() {
nsTArray<RefPtr<gfx::SourceSurfaceSharedDataWrapper>> expired;
{
StaticMonitorAutoLock lock(sMonitor);
TakeExpired(expired, lock);
}
SharedSurfacesParent::ExpireMap(expired);
}
SharedSurfacesParent::SharedSurfacesParent()
: mTracker(
StaticPrefs::image_mem_shared_unmap_min_expiration_ms_AtStartup(),
mozilla::GetCurrentEventTarget()) {}
/* static */
void SharedSurfacesParent::Initialize() {
MOZ_ASSERT(NS_IsMainThread());
StaticMonitorAutoLock lock(sMonitor);
if (!sInstance) {
sInstance = new SharedSurfacesParent();
}
}
/* static */
void SharedSurfacesParent::ShutdownRenderThread() {
// The main thread should blocked on waiting for the render thread to
// complete so this should be safe to release off the main thread.
MOZ_ASSERT(wr::RenderThread::IsInRenderThread());
StaticMonitorAutoLock lock(sMonitor);
MOZ_ASSERT(sInstance);
for (const auto& key : sInstance->mSurfaces.Keys()) {
// There may be lingering consumers of the surfaces that didn't get shutdown
// yet but since we are here, we know the render thread is finished and we
// can unregister everything.
wr::RenderThread::Get()->UnregisterExternalImageDuringShutdown(
wr::ToExternalImageId(key));
}
}
/* static */
void SharedSurfacesParent::Shutdown() {
// The compositor thread and render threads are shutdown, so this is the last
// thread that could use it. The expiration tracker needs to be freed on the
// main thread.
MOZ_ASSERT(NS_IsMainThread());
StaticMonitorAutoLock lock(sMonitor);
sInstance = nullptr;
}
/* static */
already_AddRefed<DataSourceSurface> SharedSurfacesParent::Get(
const wr::ExternalImageId& aId) {
StaticMonitorAutoLock lock(sMonitor);
if (!sInstance) {
gfxCriticalNote << "SSP:Get " << wr::AsUint64(aId) << " shtd";
return nullptr;
}
RefPtr<SourceSurfaceSharedDataWrapper> surface;
while (
!sInstance->mSurfaces.Get(wr::AsUint64(aId), getter_AddRefs(surface))) {
CVStatus status = lock.Wait(kGetTimeout);
if (status == CVStatus::Timeout) {
return nullptr;
}
}
return surface.forget();
}
/* static */
already_AddRefed<DataSourceSurface> SharedSurfacesParent::Acquire(
const wr::ExternalImageId& aId) {
StaticMonitorAutoLock lock(sMonitor);
if (!sInstance) {
gfxCriticalNote << "SSP:Acq " << wr::AsUint64(aId) << " shtd";
return nullptr;
}
RefPtr<SourceSurfaceSharedDataWrapper> surface;
sInstance->mSurfaces.Get(wr::AsUint64(aId), getter_AddRefs(surface));
if (surface) {
DebugOnly<bool> rv = surface->AddConsumer();
MOZ_ASSERT(!rv);
}
return surface.forget();
}
/* static */
bool SharedSurfacesParent::Release(const wr::ExternalImageId& aId,
bool aForCreator) {
StaticMonitorAutoLock lock(sMonitor);
if (!sInstance) {
return false;
}
uint64_t id = wr::AsUint64(aId);
RefPtr<SourceSurfaceSharedDataWrapper> surface;
sInstance->mSurfaces.Get(wr::AsUint64(aId), getter_AddRefs(surface));
if (!surface) {
return false;
}
if (surface->RemoveConsumer(aForCreator)) {
RemoveTrackingLocked(surface, lock);
wr::RenderThread::Get()->UnregisterExternalImage(wr::ToExternalImageId(id));
sInstance->mSurfaces.Remove(id);
}
return true;
}
/* static */
void SharedSurfacesParent::AddSameProcess(const wr::ExternalImageId& aId,
SourceSurfaceSharedData* aSurface) {
MOZ_ASSERT(XRE_IsParentProcess());
MOZ_ASSERT(NS_IsMainThread());
StaticMonitorAutoLock lock(sMonitor);
if (!sInstance) {
gfxCriticalNote << "SSP:Ads " << wr::AsUint64(aId) << " shtd";
return;
}
// If the child bridge detects it is in the combined UI/GPU process, then it
// will insert a wrapper surface holding the shared memory buffer directly.
// This is good because we avoid mapping the same shared memory twice, but
// still allow the original surface to be freed and remove the wrapper from
// the table when it is no longer needed.
RefPtr<SourceSurfaceSharedDataWrapper> surface =
new SourceSurfaceSharedDataWrapper();
surface->Init(aSurface);
uint64_t id = wr::AsUint64(aId);
MOZ_ASSERT(!sInstance->mSurfaces.Contains(id));
auto texture = MakeRefPtr<wr::RenderSharedSurfaceTextureHost>(surface);
wr::RenderThread::Get()->RegisterExternalImage(aId, texture.forget());
surface->AddConsumer();
sInstance->mSurfaces.InsertOrUpdate(id, std::move(surface));
lock.NotifyAll();
}
/* static */
void SharedSurfacesParent::DestroyProcess(base::ProcessId aPid) {
StaticMonitorAutoLock lock(sMonitor);
if (!sInstance) {
return;
}
// Note that the destruction of a parent may not be cheap if it still has a
// lot of surfaces still bound that require unmapping.
for (auto i = sInstance->mSurfaces.Iter(); !i.Done(); i.Next()) {
SourceSurfaceSharedDataWrapper* surface = i.Data();
if (surface->GetCreatorPid() == aPid && surface->HasCreatorRef() &&
surface->RemoveConsumer(/* aForCreator */ true)) {
RemoveTrackingLocked(surface, lock);
wr::RenderThread::Get()->UnregisterExternalImage(
wr::ToExternalImageId(i.Key()));
i.Remove();
}
}
}
/* static */
void SharedSurfacesParent::Add(const wr::ExternalImageId& aId,
SurfaceDescriptorShared&& aDesc,
base::ProcessId aPid) {
MOZ_ASSERT(CompositorThreadHolder::IsInCompositorThread());
MOZ_ASSERT(aPid != base::GetCurrentProcId());
RefPtr<SourceSurfaceSharedDataWrapper> surface =
new SourceSurfaceSharedDataWrapper();
// We preferentially map in new surfaces when they are initially received
// because we are likely to reference them in a display list soon. The unmap
// will ensure we add the surface to the expiration tracker. We do it outside
// the mutex to ensure we always lock the surface mutex first, and our mutex
// second, to avoid deadlock.
//
// Note that the surface wrapper maps in the given handle as read only.
surface->Init(aDesc.size(), aDesc.stride(), aDesc.format(),
std::move(aDesc.handle()), aPid);
StaticMonitorAutoLock lock(sMonitor);
if (!sInstance) {
gfxCriticalNote << "SSP:Add " << wr::AsUint64(aId) << " shtd";
return;
}
uint64_t id = wr::AsUint64(aId);
MOZ_ASSERT(!sInstance->mSurfaces.Contains(id));
auto texture = MakeRefPtr<wr::RenderSharedSurfaceTextureHost>(surface);
wr::RenderThread::Get()->RegisterExternalImage(aId, texture.forget());
surface->AddConsumer();
sInstance->mSurfaces.InsertOrUpdate(id, std::move(surface));
lock.NotifyAll();
}
/* static */
void SharedSurfacesParent::Remove(const wr::ExternalImageId& aId) {
DebugOnly<bool> rv = Release(aId, /* aForCreator */ true);
MOZ_ASSERT(rv);
}
/* static */
void SharedSurfacesParent::AddTrackingLocked(
SourceSurfaceSharedDataWrapper* aSurface,
const StaticMonitorAutoLock& aAutoLock) {
MOZ_ASSERT(!aSurface->GetExpirationState()->IsTracked());
sInstance->mTracker.AddObjectLocked(aSurface, aAutoLock);
}
/* static */
void SharedSurfacesParent::AddTracking(
SourceSurfaceSharedDataWrapper* aSurface) {
StaticMonitorAutoLock lock(sMonitor);
if (!sInstance) {
return;
}
AddTrackingLocked(aSurface, lock);
}
/* static */
void SharedSurfacesParent::RemoveTrackingLocked(
SourceSurfaceSharedDataWrapper* aSurface,
const StaticMonitorAutoLock& aAutoLock) {
if (!aSurface->GetExpirationState()->IsTracked()) {
return;
}
sInstance->mTracker.RemoveObjectLocked(aSurface, aAutoLock);
}
/* static */
void SharedSurfacesParent::RemoveTracking(
SourceSurfaceSharedDataWrapper* aSurface) {
StaticMonitorAutoLock lock(sMonitor);
if (!sInstance) {
return;
}
RemoveTrackingLocked(aSurface, lock);
}
/* static */
bool SharedSurfacesParent::AgeOneGenerationLocked(
nsTArray<RefPtr<SourceSurfaceSharedDataWrapper>>& aExpired,
const StaticMonitorAutoLock& aAutoLock) {
if (sInstance->mTracker.IsEmptyLocked(aAutoLock)) {
return false;
}
sInstance->mTracker.AgeOneGenerationLocked(aAutoLock);
sInstance->mTracker.TakeExpired(aExpired, aAutoLock);
return true;
}
/* static */
bool SharedSurfacesParent::AgeOneGeneration(
nsTArray<RefPtr<SourceSurfaceSharedDataWrapper>>& aExpired) {
StaticMonitorAutoLock lock(sMonitor);
if (!sInstance) {
return false;
}
return AgeOneGenerationLocked(aExpired, lock);
}
/* static */
bool SharedSurfacesParent::AgeAndExpireOneGeneration() {
nsTArray<RefPtr<SourceSurfaceSharedDataWrapper>> expired;
bool aged = AgeOneGeneration(expired);
ExpireMap(expired);
return aged;
}
/* static */
void SharedSurfacesParent::ExpireMap(
nsTArray<RefPtr<SourceSurfaceSharedDataWrapper>>& aExpired) {
for (auto& surface : aExpired) {
surface->ExpireMap();
}
}
/* static */
void SharedSurfacesParent::AccumulateMemoryReport(
base::ProcessId aPid, SharedSurfacesMemoryReport& aReport) {
StaticMonitorAutoLock lock(sMonitor);
if (!sInstance) {
return;
}
for (const auto& entry : sInstance->mSurfaces) {
SourceSurfaceSharedDataWrapper* surface = entry.GetData();
if (surface->GetCreatorPid() == aPid) {
aReport.mSurfaces.insert(std::make_pair(
entry.GetKey(),
SharedSurfacesMemoryReport::SurfaceEntry{
aPid, surface->GetSize(), surface->Stride(),
surface->GetConsumers(), surface->HasCreatorRef()}));
}
}
}
/* static */
bool SharedSurfacesParent::AccumulateMemoryReport(
SharedSurfacesMemoryReport& aReport) {
if (XRE_IsParentProcess()) {
GPUProcessManager* gpm = GPUProcessManager::Get();
if (!gpm || gpm->GPUProcessPid() != base::kInvalidProcessId) {
return false;
}
} else if (!XRE_IsGPUProcess()) {
return false;
}
StaticMonitorAutoLock lock(sMonitor);
if (!sInstance) {
return true;
}
for (const auto& entry : sInstance->mSurfaces) {
SourceSurfaceSharedDataWrapper* surface = entry.GetData();
aReport.mSurfaces.insert(std::make_pair(
entry.GetKey(),
SharedSurfacesMemoryReport::SurfaceEntry{
surface->GetCreatorPid(), surface->GetSize(), surface->Stride(),
surface->GetConsumers(), surface->HasCreatorRef()}));
}
return true;
}
} // namespace layers
} // namespace mozilla