summaryrefslogtreecommitdiffstats
path: root/gfx/layers/ipc/SharedSurfacesParent.cpp
blob: 932a7558adde6a0d7cbc52ddddac5f6ff412c201 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
/* -*- 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/CompositorManagerParent.h"
#include "mozilla/layers/CompositorThread.h"
#include "mozilla/webrender/RenderSharedSurfaceTextureHost.h"
#include "mozilla/webrender/RenderThread.h"
#include "nsThreadUtils.h"  // for GetCurrentSerialEventTarget

namespace mozilla {
namespace layers {

using namespace mozilla::gfx;

StaticMutex SharedSurfacesParent::sMutex;
StaticAutoPtr<SharedSurfacesParent> SharedSurfacesParent::sInstance;

void SharedSurfacesParent::MappingTracker::NotifyExpiredLocked(
    SourceSurfaceSharedDataWrapper* aSurface,
    const StaticMutexAutoLock& aAutoLock) {
  RemoveObjectLocked(aSurface, aAutoLock);
  mExpired.AppendElement(aSurface);
}

void SharedSurfacesParent::MappingTracker::TakeExpired(
    nsTArray<RefPtr<gfx::SourceSurfaceSharedDataWrapper>>& aExpired,
    const StaticMutexAutoLock& aAutoLock) {
  aExpired = std::move(mExpired);
}

void SharedSurfacesParent::MappingTracker::NotifyHandlerEnd() {
  nsTArray<RefPtr<gfx::SourceSurfaceSharedDataWrapper>> expired;
  {
    StaticMutexAutoLock lock(sMutex);
    TakeExpired(expired, lock);
  }

  SharedSurfacesParent::ExpireMap(expired);
}

SharedSurfacesParent::SharedSurfacesParent()
    : mTracker(
          StaticPrefs::image_mem_shared_unmap_min_expiration_ms_AtStartup(),
          mozilla::GetCurrentSerialEventTarget()) {}

/* static */
void SharedSurfacesParent::Initialize() {
  MOZ_ASSERT(NS_IsMainThread());
  StaticMutexAutoLock lock(sMutex);
  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());
  StaticMutexAutoLock lock(sMutex);
  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());
  StaticMutexAutoLock lock(sMutex);
  sInstance = nullptr;
}

/* static */
already_AddRefed<DataSourceSurface> SharedSurfacesParent::Get(
    const wr::ExternalImageId& aId) {
  RefPtr<SourceSurfaceSharedDataWrapper> surface;

  {
    StaticMutexAutoLock lock(sMutex);
    if (!sInstance) {
      gfxCriticalNote << "SSP:Get " << wr::AsUint64(aId) << " shtd";
      return nullptr;
    }

    if (sInstance->mSurfaces.Get(wr::AsUint64(aId), getter_AddRefs(surface))) {
      return surface.forget();
    }
  }

  // We cannot block the compositor thread since that's the thread the necessary
  // IPDL events would come in on.
  if (NS_WARN_IF(CompositorThreadHolder::IsInCompositorThread())) {
    return nullptr;
  }

  // Block until we see the relevant resource come in or the actor is destroyed.
  CompositorManagerParent::WaitForSharedSurface(aId);

  StaticMutexAutoLock lock(sMutex);
  if (!sInstance) {
    gfxCriticalNote << "SSP:Get " << wr::AsUint64(aId) << " shtd";
    return nullptr;
  }

  sInstance->mSurfaces.Get(wr::AsUint64(aId), getter_AddRefs(surface));
  return surface.forget();
}

/* static */
already_AddRefed<DataSourceSurface> SharedSurfacesParent::Acquire(
    const wr::ExternalImageId& aId) {
  StaticMutexAutoLock lock(sMutex);
  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) {
  StaticMutexAutoLock lock(sMutex);
  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());
  StaticMutexAutoLock lock(sMutex);
  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));
}

/* static */
void SharedSurfacesParent::RemoveAll(uint32_t aNamespace) {
  StaticMutexAutoLock lock(sMutex);
  if (!sInstance) {
    return;
  }

  auto* renderThread = wr::RenderThread::Get();

  // 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()) {
    if (static_cast<uint32_t>(i.Key() >> 32) != aNamespace) {
      continue;
    }

    SourceSurfaceSharedDataWrapper* surface = i.Data();
    if (surface->HasCreatorRef() &&
        surface->RemoveConsumer(/* aForCreator */ true)) {
      RemoveTrackingLocked(surface, lock);
      if (renderThread) {
        renderThread->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);

  StaticMutexAutoLock lock(sMutex);
  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));
}

/* 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 StaticMutexAutoLock& aAutoLock) {
  MOZ_ASSERT(!aSurface->GetExpirationState()->IsTracked());
  sInstance->mTracker.AddObjectLocked(aSurface, aAutoLock);
}

/* static */
void SharedSurfacesParent::AddTracking(
    SourceSurfaceSharedDataWrapper* aSurface) {
  StaticMutexAutoLock lock(sMutex);
  if (!sInstance) {
    return;
  }

  AddTrackingLocked(aSurface, lock);
}

/* static */
void SharedSurfacesParent::RemoveTrackingLocked(
    SourceSurfaceSharedDataWrapper* aSurface,
    const StaticMutexAutoLock& aAutoLock) {
  if (!aSurface->GetExpirationState()->IsTracked()) {
    return;
  }

  sInstance->mTracker.RemoveObjectLocked(aSurface, aAutoLock);
}

/* static */
void SharedSurfacesParent::RemoveTracking(
    SourceSurfaceSharedDataWrapper* aSurface) {
  StaticMutexAutoLock lock(sMutex);
  if (!sInstance) {
    return;
  }

  RemoveTrackingLocked(aSurface, lock);
}

/* static */
bool SharedSurfacesParent::AgeOneGenerationLocked(
    nsTArray<RefPtr<SourceSurfaceSharedDataWrapper>>& aExpired,
    const StaticMutexAutoLock& 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) {
  StaticMutexAutoLock lock(sMutex);
  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(
    uint32_t aNamespace, SharedSurfacesMemoryReport& aReport) {
  StaticMutexAutoLock lock(sMutex);
  if (!sInstance) {
    return;
  }

  for (const auto& entry : sInstance->mSurfaces) {
    if (static_cast<uint32_t>(entry.GetKey() >> 32) != aNamespace) {
      continue;
    }

    SourceSurfaceSharedDataWrapper* surface = entry.GetData();
    aReport.mSurfaces.insert(std::make_pair(
        entry.GetKey(),
        SharedSurfacesMemoryReport::SurfaceEntry{
            surface->GetCreatorPid(), 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;
  }

  StaticMutexAutoLock lock(sMutex);
  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