libs/vr/libvrflinger/display_surface.cpp

   1 #include "display_surface.h"
   2
   3 #include <private/android_filesystem_config.h>
   4 #include <utils/Trace.h>
   5
   6 #include <private/dvr/trusted_uids.h>
   7
   8 #include "display_service.h"
   9 #include "hardware_composer.h"
  10
  11 #define LOCAL_TRACE 1
  12
  13 using android::dvr::display::DisplayProtocol;
  14 using android::pdx::BorrowedChannelHandle;
  15 using android::pdx::ErrorStatus;
  16 using android::pdx::LocalChannelHandle;
  17 using android::pdx::LocalHandle;
  18 using android::pdx::Message;
  19 using android::pdx::RemoteChannelHandle;
  20 using android::pdx::Status;
  21 using android::pdx::rpc::DispatchRemoteMethod;
  22 using android::pdx::rpc::IfAnyOf;
  23
  24 namespace android {
  25 namespace dvr {
  26
  27 DisplaySurface::DisplaySurface(DisplayService* service,
  28                                SurfaceType surface_type, int surface_id,
  29                                int process_id, int user_id,
  30                                const display::SurfaceAttributes& attributes)
  31     : service_(service),
  32       surface_type_(surface_type),
  33       surface_id_(surface_id),
  34       process_id_(process_id),
  35       user_id_(user_id),
  36       attributes_(attributes),
  37       update_flags_(display::SurfaceUpdateFlags::NewSurface) {}
  38
  39 DisplaySurface::~DisplaySurface() {
  40   ALOGD_IF(LOCAL_TRACE,
  41            "DisplaySurface::~DisplaySurface: surface_id=%d process_id=%d",
  42            surface_id(), process_id());
  43 }
  44
  45 Status<void> DisplaySurface::HandleMessage(pdx::Message& message) {
  46   switch (message.GetOp()) {
  47     case DisplayProtocol::SetAttributes::Opcode:
  48       DispatchRemoteMethod<DisplayProtocol::SetAttributes>(
  49           *this, &DisplaySurface::OnSetAttributes, message);
  50       break;
  51
  52     case DisplayProtocol::GetSurfaceInfo::Opcode:
  53       DispatchRemoteMethod<DisplayProtocol::GetSurfaceInfo>(
  54           *this, &DisplaySurface::OnGetSurfaceInfo, message);
  55       break;
  56
  57     case DisplayProtocol::CreateQueue::Opcode:
  58       DispatchRemoteMethod<DisplayProtocol::CreateQueue>(
  59           *this, &DisplaySurface::OnCreateQueue, message);
  60       break;
  61   }
  62
  63   return {};
  64 }
  65
  66 Status<void> DisplaySurface::OnSetAttributes(
  67     pdx::Message& /*message*/, const display::SurfaceAttributes& attributes) {
  68   display::SurfaceUpdateFlags update_flags;
  69
  70   for (const auto& attribute : attributes) {
  71     const auto key = attribute.first;
  72     const auto* variant = &attribute.second;
  73     bool invalid_value = false;
  74     bool visibility_changed = false;
  75
  76     // Catch attributes that have significance to the display service.
  77     switch (key) {
  78       case display::SurfaceAttribute::ZOrder:
  79         invalid_value = !IfAnyOf<int32_t, int64_t, float>::Call(
  80             variant, [&](const auto& value) {
  81               if (z_order_ != value) {
  82                 visibility_changed = true;
  83                 z_order_ = value;
  84               }
  85             });
  86         break;
  87       case display::SurfaceAttribute::Visible:
  88         invalid_value = !IfAnyOf<int32_t, int64_t, bool>::Call(
  89             variant, [&](const auto& value) {
  90               if (visible_ != value) {
  91                 visibility_changed = true;
  92                 visible_ = value;
  93               }
  94             });
  95         break;
  96     }
  97
  98     // Only update the attribute map with valid values. This check also has the
  99     // effect of preventing special attributes handled above from being deleted
 100     // by an empty value.
 101     if (invalid_value) {
 102       ALOGW(
 103           "DisplaySurface::OnClientSetAttributes: Failed to set display "
 104           "surface attribute '%d' because of incompatible type: %d",
 105           key, variant->index());
 106     } else {
 107       // An empty value indicates the attribute should be deleted.
 108       if (variant->empty()) {
 109         auto search = attributes_.find(key);
 110         if (search != attributes_.end())
 111           attributes_.erase(search);
 112       } else {
 113         attributes_[key] = *variant;
 114       }
 115
 116       // All attribute changes generate a notification, even if the value
 117       // doesn't change. Visibility attributes set a flag only if the value
 118       // changes.
 119       update_flags.Set(display::SurfaceUpdateFlags::AttributesChanged);
 120       if (visibility_changed)
 121         update_flags.Set(display::SurfaceUpdateFlags::VisibilityChanged);
 122     }
 123   }
 124
 125   SurfaceUpdated(update_flags);
 126   return {};
 127 }
 128
 129 void DisplaySurface::SurfaceUpdated(display::SurfaceUpdateFlags update_flags) {
 130   ALOGD_IF(TRACE,
 131            "DisplaySurface::SurfaceUpdated: surface_id=%d update_flags=0x%x",
 132            surface_id(), update_flags.value());
 133
 134   update_flags_.Set(update_flags);
 135   service()->SurfaceUpdated(surface_type(), update_flags_);
 136 }
 137
 138 void DisplaySurface::ClearUpdate() {
 139   ALOGD_IF(TRACE > 1, "DisplaySurface::ClearUpdate: surface_id=%d",
 140            surface_id());
 141   update_flags_ = display::SurfaceUpdateFlags::None;
 142 }
 143
 144 Status<display::SurfaceInfo> DisplaySurface::OnGetSurfaceInfo(
 145     Message& /*message*/) {
 146   ALOGD_IF(
 147       TRACE,
 148       "DisplaySurface::OnGetSurfaceInfo: surface_id=%d visible=%d z_order=%d",
 149       surface_id(), visible(), z_order());
 150   return {{surface_id(), visible(), z_order()}};
 151 }
 152
 153 Status<void> DisplaySurface::RegisterQueue(
 154     const std::shared_ptr<ConsumerQueue>& consumer_queue) {
 155   ALOGD_IF(TRACE, "DisplaySurface::RegisterQueue: surface_id=%d queue_id=%d",
 156            surface_id(), consumer_queue->id());
 157   // Capture references for the lambda to work around apparent clang bug.
 158   // TODO(eieio): Figure out if there is a clang bug or C++11 ambiguity when
 159   // capturing self and consumer_queue by copy in the following case:
 160   //    auto self = Self();
 161   //    [self, consumer_queue](int events) {
 162   //        self->OnQueueEvent(consuemr_queue, events); }
 163   //
 164   struct State {
 165     std::shared_ptr<DisplaySurface> surface;
 166     std::shared_ptr<ConsumerQueue> queue;
 167   };
 168   State state{Self(), consumer_queue};
 169
 170   return service()->AddEventHandler(
 171       consumer_queue->queue_fd(), EPOLLIN | EPOLLHUP | EPOLLET,
 172       [state](int events) {
 173         state.surface->OnQueueEvent(state.queue, events);
 174       });
 175 }
 176
 177 Status<void> DisplaySurface::UnregisterQueue(
 178     const std::shared_ptr<ConsumerQueue>& consumer_queue) {
 179   ALOGD_IF(TRACE, "DisplaySurface::UnregisterQueue: surface_id=%d queue_id=%d",
 180            surface_id(), consumer_queue->id());
 181   return service()->RemoveEventHandler(consumer_queue->queue_fd());
 182 }
 183
 184 void DisplaySurface::OnQueueEvent(
 185     const std::shared_ptr<ConsumerQueue>& /*consumer_queue*/, int /*events*/) {
 186   ALOGE(
 187       "DisplaySurface::OnQueueEvent: ERROR base virtual method should not be "
 188       "called!!!");
 189 }
 190
 191 std::shared_ptr<ConsumerQueue> ApplicationDisplaySurface::GetQueue(
 192     int32_t queue_id) {
 193   ALOGD_IF(TRACE,
 194            "ApplicationDisplaySurface::GetQueue: surface_id=%d queue_id=%d",
 195            surface_id(), queue_id);
 196
 197   std::lock_guard<std::mutex> autolock(lock_);
 198   auto search = consumer_queues_.find(queue_id);
 199   if (search != consumer_queues_.end())
 200     return search->second;
 201   else
 202     return nullptr;
 203 }
 204
 205 std::vector<int32_t> ApplicationDisplaySurface::GetQueueIds() const {
 206   std::lock_guard<std::mutex> autolock(lock_);
 207   std::vector<int32_t> queue_ids;
 208   for (const auto& entry : consumer_queues_)
 209     queue_ids.push_back(entry.first);
 210   return queue_ids;
 211 }
 212
 213 Status<LocalChannelHandle> ApplicationDisplaySurface::OnCreateQueue(
 214     Message& /*message*/, const ProducerQueueConfig& config) {
 215   ATRACE_NAME("ApplicationDisplaySurface::OnCreateQueue");
 216   ALOGD_IF(TRACE,
 217            "ApplicationDisplaySurface::OnCreateQueue: surface_id=%d, "
 218            "meta_size_bytes=%zu",
 219            surface_id(), config.meta_size_bytes);
 220
 221   std::lock_guard<std::mutex> autolock(lock_);
 222   auto producer = ProducerQueue::Create(config, UsagePolicy{});
 223   if (!producer) {
 224     ALOGE(
 225         "ApplicationDisplaySurface::OnCreateQueue: Failed to create producer "
 226         "queue!");
 227     return ErrorStatus(ENOMEM);
 228   }
 229
 230   std::shared_ptr<ConsumerQueue> consumer =
 231       producer->CreateSilentConsumerQueue();
 232   auto status = RegisterQueue(consumer);
 233   if (!status) {
 234     ALOGE(
 235         "ApplicationDisplaySurface::OnCreateQueue: Failed to register consumer "
 236         "queue: %s",
 237         status.GetErrorMessage().c_str());
 238     return status.error_status();
 239   }
 240
 241   consumer_queues_[consumer->id()] = std::move(consumer);
 242
 243   SurfaceUpdated(display::SurfaceUpdateFlags::BuffersChanged);
 244   return std::move(producer->GetChannelHandle());
 245 }
 246
 247 void ApplicationDisplaySurface::OnQueueEvent(
 248     const std::shared_ptr<ConsumerQueue>& consumer_queue, int events) {
 249   ALOGD_IF(TRACE,
 250            "ApplicationDisplaySurface::OnQueueEvent: queue_id=%d events=%x",
 251            consumer_queue->id(), events);
 252
 253   std::lock_guard<std::mutex> autolock(lock_);
 254
 255   // Always give the queue a chance to handle its internal bookkeeping.
 256   consumer_queue->HandleQueueEvents();
 257
 258   // Check for hangup and remove a queue that is no longer needed.
 259   if (consumer_queue->hung_up()) {
 260     ALOGD_IF(TRACE, "ApplicationDisplaySurface::OnQueueEvent: Removing queue.");
 261     UnregisterQueue(consumer_queue);
 262     auto search = consumer_queues_.find(consumer_queue->id());
 263     if (search != consumer_queues_.end()) {
 264       consumer_queues_.erase(search);
 265     } else {
 266       ALOGE(
 267           "ApplicationDisplaySurface::OnQueueEvent: Failed to find queue_id=%d",
 268           consumer_queue->id());
 269     }
 270     SurfaceUpdated(display::SurfaceUpdateFlags::BuffersChanged);
 271   }
 272 }
 273
 274 std::vector<int32_t> DirectDisplaySurface::GetQueueIds() const {
 275   std::lock_guard<std::mutex> autolock(lock_);
 276   std::vector<int32_t> queue_ids;
 277   if (direct_queue_)
 278     queue_ids.push_back(direct_queue_->id());
 279   return queue_ids;
 280 }
 281
 282 Status<LocalChannelHandle> DirectDisplaySurface::OnCreateQueue(
 283     Message& /*message*/, const ProducerQueueConfig& config) {
 284   ATRACE_NAME("DirectDisplaySurface::OnCreateQueue");
 285   ALOGD_IF(
 286       TRACE,
 287       "DirectDisplaySurface::OnCreateQueue: surface_id=%d meta_size_bytes=%zu",
 288       surface_id(), config.meta_size_bytes);
 289
 290   std::lock_guard<std::mutex> autolock(lock_);
 291   if (!direct_queue_) {
 292     // Inject the hw composer usage flag to enable the display to read the
 293     // buffers.
 294     auto producer = ProducerQueue::Create(
 295         config, UsagePolicy{GraphicBuffer::USAGE_HW_COMPOSER, 0, 0, 0});
 296     if (!producer) {
 297       ALOGE(
 298           "DirectDisplaySurface::OnCreateQueue: Failed to create producer "
 299           "queue!");
 300       return ErrorStatus(ENOMEM);
 301     }
 302
 303     direct_queue_ = producer->CreateConsumerQueue();
 304     auto status = RegisterQueue(direct_queue_);
 305     if (!status) {
 306       ALOGE(
 307           "DirectDisplaySurface::OnCreateQueue: Failed to register consumer "
 308           "queue: %s",
 309           status.GetErrorMessage().c_str());
 310       return status.error_status();
 311     }
 312
 313     return std::move(producer->GetChannelHandle());
 314   } else {
 315     return ErrorStatus(EALREADY);
 316   }
 317 }
 318
 319 void DirectDisplaySurface::OnQueueEvent(
 320     const std::shared_ptr<ConsumerQueue>& consumer_queue, int events) {
 321   ALOGD_IF(TRACE, "DirectDisplaySurface::OnQueueEvent: queue_id=%d events=%x",
 322            consumer_queue->id(), events);
 323
 324   std::lock_guard<std::mutex> autolock(lock_);
 325
 326   // Always give the queue a chance to handle its internal bookkeeping.
 327   consumer_queue->HandleQueueEvents();
 328
 329   // Check for hangup and remove a queue that is no longer needed.
 330   if (consumer_queue->hung_up()) {
 331     ALOGD_IF(TRACE, "DirectDisplaySurface::OnQueueEvent: Removing queue.");
 332     UnregisterQueue(consumer_queue);
 333     direct_queue_ = nullptr;
 334   }
 335 }
 336
 337 void DirectDisplaySurface::DequeueBuffersLocked() {
 338   if (direct_queue_ == nullptr) {
 339     ALOGE(
 340         "DirectDisplaySurface::DequeueBuffersLocked: Consumer queue is not "
 341         "initialized.");
 342     return;
 343   }
 344
 345   while (true) {
 346     LocalHandle acquire_fence;
 347     size_t slot;
 348     auto buffer_status = direct_queue_->Dequeue(0, &slot, &acquire_fence);
 349     if (!buffer_status) {
 350       ALOGD_IF(
 351           TRACE > 1 && buffer_status.error() == ETIMEDOUT,
 352           "DirectDisplaySurface::DequeueBuffersLocked: All buffers dequeued.");
 353       ALOGE_IF(buffer_status.error() != ETIMEDOUT,
 354                "DirectDisplaySurface::DequeueBuffersLocked: Failed to dequeue "
 355                "buffer: %s",
 356                buffer_status.GetErrorMessage().c_str());
 357       return;
 358     }
 359     auto buffer_consumer = buffer_status.take();
 360
 361     if (!visible()) {
 362       ATRACE_NAME("DropFrameOnInvisibleSurface");
 363       ALOGD_IF(TRACE,
 364                "DirectDisplaySurface::DequeueBuffersLocked: Discarding "
 365                "buffer_id=%d on invisible surface.",
 366                buffer_consumer->id());
 367       buffer_consumer->Discard();
 368       continue;
 369     }
 370
 371     if (acquired_buffers_.IsFull()) {
 372       ALOGE(
 373           "DirectDisplaySurface::DequeueBuffersLocked: Posted buffers full, "
 374           "overwriting.");
 375       acquired_buffers_.PopBack();
 376     }
 377
 378     acquired_buffers_.Append(
 379         AcquiredBuffer(buffer_consumer, std::move(acquire_fence)));
 380   }
 381 }
 382
 383 AcquiredBuffer DirectDisplaySurface::AcquireCurrentBuffer() {
 384   std::lock_guard<std::mutex> autolock(lock_);
 385   DequeueBuffersLocked();
 386
 387   if (acquired_buffers_.IsEmpty()) {
 388     ALOGE(
 389         "DirectDisplaySurface::AcquireCurrentBuffer: attempt to acquire buffer "
 390         "when none are posted.");
 391     return AcquiredBuffer();
 392   }
 393   AcquiredBuffer buffer = std::move(acquired_buffers_.Front());
 394   acquired_buffers_.PopFront();
 395   ALOGD_IF(TRACE, "DirectDisplaySurface::AcquireCurrentBuffer: buffer_id=%d",
 396            buffer.buffer()->id());
 397   return buffer;
 398 }
 399
 400 AcquiredBuffer DirectDisplaySurface::AcquireNewestAvailableBuffer(
 401     AcquiredBuffer* skipped_buffer) {
 402   std::lock_guard<std::mutex> autolock(lock_);
 403   DequeueBuffersLocked();
 404
 405   AcquiredBuffer buffer;
 406   int frames = 0;
 407   // Basic latency stopgap for when the application misses a frame:
 408   // If the application recovers on the 2nd or 3rd (etc) frame after
 409   // missing, this code will skip frames to catch up by checking if
 410   // the next frame is also available.
 411   while (!acquired_buffers_.IsEmpty() &&
 412          acquired_buffers_.Front().IsAvailable()) {
 413     // Capture the skipped buffer into the result parameter.
 414     // Note that this API only supports skipping one buffer per vsync.
 415     if (frames > 0 && skipped_buffer)
 416       *skipped_buffer = std::move(buffer);
 417     ++frames;
 418     buffer = std::move(acquired_buffers_.Front());
 419     acquired_buffers_.PopFront();
 420     if (frames == 2)
 421       break;
 422   }
 423   ALOGD_IF(TRACE,
 424            "DirectDisplaySurface::AcquireNewestAvailableBuffer: buffer_id=%d",
 425            buffer.buffer()->id());
 426   return buffer;
 427 }
 428
 429 bool DirectDisplaySurface::IsBufferAvailable() {
 430   std::lock_guard<std::mutex> autolock(lock_);
 431   DequeueBuffersLocked();
 432
 433   return !acquired_buffers_.IsEmpty() &&
 434          acquired_buffers_.Front().IsAvailable();
 435 }
 436
 437 bool DirectDisplaySurface::IsBufferPosted() {
 438   std::lock_guard<std::mutex> autolock(lock_);
 439   DequeueBuffersLocked();
 440
 441   return !acquired_buffers_.IsEmpty();
 442 }
 443
 444 Status<std::shared_ptr<DisplaySurface>> DisplaySurface::Create(
 445     DisplayService* service, int surface_id, int process_id, int user_id,
 446     const display::SurfaceAttributes& attributes) {
 447   bool direct = false;
 448   auto search = attributes.find(display::SurfaceAttribute::Direct);
 449   if (search != attributes.end()) {
 450     if (!IfAnyOf<int32_t, int64_t, bool, float>::Get(&search->second,
 451                                                      &direct)) {
 452       ALOGE(
 453           "DisplaySurface::Create: Invalid type for SurfaceAttribute::Direct!");
 454       return ErrorStatus(EINVAL);
 455     }
 456   }
 457
 458   ALOGD_IF(TRACE,
 459            "DisplaySurface::Create: surface_id=%d process_id=%d user_id=%d "
 460            "direct=%d",
 461            surface_id, process_id, user_id, direct);
 462
 463   if (direct) {
 464     const bool trusted = user_id == AID_ROOT || IsTrustedUid(user_id);
 465     if (trusted) {
 466       return {std::shared_ptr<DisplaySurface>{new DirectDisplaySurface(
 467           service, surface_id, process_id, user_id, attributes)}};
 468     } else {
 469       ALOGE(
 470           "DisplaySurface::Create: Direct surfaces may only be created by "
 471           "trusted UIDs: user_id=%d",
 472           user_id);
 473       return ErrorStatus(EPERM);
 474     }
 475   } else {
 476     return {std::shared_ptr<DisplaySurface>{new ApplicationDisplaySurface(
 477         service, surface_id, process_id, user_id, attributes)}};
 478   }
 479 }
 480
 481 }  // namespace dvr
 482 }  // namespace android