| #include <private/dvr/consumer_buffer.h> |
| |
| using android::pdx::LocalChannelHandle; |
| using android::pdx::LocalHandle; |
| using android::pdx::Status; |
| |
| namespace android { |
| namespace dvr { |
| |
| ConsumerBuffer::ConsumerBuffer(LocalChannelHandle channel) |
| : BASE(std::move(channel)) { |
| const int ret = ImportBuffer(); |
| if (ret < 0) { |
| ALOGE("ConsumerBuffer::ConsumerBuffer: Failed to import buffer: %s", |
| strerror(-ret)); |
| Close(ret); |
| } |
| } |
| |
| std::unique_ptr<ConsumerBuffer> ConsumerBuffer::Import( |
| LocalChannelHandle channel) { |
| ATRACE_NAME("ConsumerBuffer::Import"); |
| ALOGD_IF(TRACE, "ConsumerBuffer::Import: channel=%d", channel.value()); |
| return ConsumerBuffer::Create(std::move(channel)); |
| } |
| |
| std::unique_ptr<ConsumerBuffer> ConsumerBuffer::Import( |
| Status<LocalChannelHandle> status) { |
| return Import(status ? status.take() |
| : LocalChannelHandle{nullptr, -status.error()}); |
| } |
| |
| int ConsumerBuffer::LocalAcquire(DvrNativeBufferMetadata* out_meta, |
| LocalHandle* out_fence) { |
| if (!out_meta) |
| return -EINVAL; |
| |
| // The buffer can be acquired iff the buffer state for this client is posted. |
| uint32_t current_buffer_state = |
| buffer_state_->load(std::memory_order_acquire); |
| if (!BufferHubDefs::isClientPosted(current_buffer_state, |
| client_state_mask())) { |
| ALOGE( |
| "%s: Failed to acquire the buffer. The buffer is not posted, id=%d " |
| "state=%" PRIx32 " client_state_mask=%" PRIx32 ".", |
| __FUNCTION__, id(), current_buffer_state, client_state_mask()); |
| return -EBUSY; |
| } |
| |
| // Change the buffer state for this consumer from posted to acquired. |
| uint32_t updated_buffer_state = current_buffer_state ^ client_state_mask(); |
| while (!buffer_state_->compare_exchange_weak( |
| current_buffer_state, updated_buffer_state, std::memory_order_acq_rel, |
| std::memory_order_acquire)) { |
| ALOGD( |
| "%s Failed to acquire the buffer. Current buffer state was changed to " |
| "%" PRIx32 |
| " when trying to acquire the buffer and modify the buffer state to " |
| "%" PRIx32 ". About to try again if the buffer is still posted.", |
| __FUNCTION__, current_buffer_state, updated_buffer_state); |
| if (!BufferHubDefs::isClientPosted(current_buffer_state, |
| client_state_mask())) { |
| ALOGE( |
| "%s: Failed to acquire the buffer. The buffer is no longer posted, " |
| "id=%d state=%" PRIx32 " client_state_mask=%" PRIx32 ".", |
| __FUNCTION__, id(), current_buffer_state, client_state_mask()); |
| return -EBUSY; |
| } |
| // The failure of compare_exchange_weak updates current_buffer_state. |
| updated_buffer_state = current_buffer_state ^ client_state_mask(); |
| } |
| |
| // Copy the canonical metadata. |
| void* metadata_ptr = reinterpret_cast<void*>(&metadata_header_->metadata); |
| memcpy(out_meta, metadata_ptr, sizeof(DvrNativeBufferMetadata)); |
| // Fill in the user_metadata_ptr in address space of the local process. |
| if (out_meta->user_metadata_size) { |
| out_meta->user_metadata_ptr = |
| reinterpret_cast<uint64_t>(user_metadata_ptr_); |
| } else { |
| out_meta->user_metadata_ptr = 0; |
| } |
| |
| uint32_t fence_state = fence_state_->load(std::memory_order_acquire); |
| // If there is an acquire fence from producer, we need to return it. |
| // The producer state bit mask is kFirstClientBitMask for now. |
| if (fence_state & BufferHubDefs::kFirstClientBitMask) { |
| *out_fence = shared_acquire_fence_.Duplicate(); |
| } |
| |
| return 0; |
| } |
| |
| int ConsumerBuffer::Acquire(LocalHandle* ready_fence) { |
| return Acquire(ready_fence, nullptr, 0); |
| } |
| |
| int ConsumerBuffer::Acquire(LocalHandle* ready_fence, void* meta, |
| size_t user_metadata_size) { |
| ATRACE_NAME("ConsumerBuffer::Acquire"); |
| |
| if (const int error = CheckMetadata(user_metadata_size)) |
| return error; |
| |
| DvrNativeBufferMetadata canonical_meta; |
| if (const int error = LocalAcquire(&canonical_meta, ready_fence)) |
| return error; |
| |
| if (meta && user_metadata_size) { |
| void* metadata_src = |
| reinterpret_cast<void*>(canonical_meta.user_metadata_ptr); |
| if (metadata_src) { |
| memcpy(meta, metadata_src, user_metadata_size); |
| } else { |
| ALOGW("ConsumerBuffer::Acquire: no user-defined metadata."); |
| } |
| } |
| |
| auto status = InvokeRemoteMethod<BufferHubRPC::ConsumerAcquire>(); |
| if (!status) |
| return -status.error(); |
| return 0; |
| } |
| |
| int ConsumerBuffer::AcquireAsync(DvrNativeBufferMetadata* out_meta, |
| LocalHandle* out_fence) { |
| ATRACE_NAME("ConsumerBuffer::AcquireAsync"); |
| |
| if (const int error = LocalAcquire(out_meta, out_fence)) |
| return error; |
| |
| auto status = SendImpulse(BufferHubRPC::ConsumerAcquire::Opcode); |
| if (!status) |
| return -status.error(); |
| return 0; |
| } |
| |
| int ConsumerBuffer::LocalRelease(const DvrNativeBufferMetadata* meta, |
| const LocalHandle& release_fence) { |
| if (const int error = CheckMetadata(meta->user_metadata_size)) |
| return error; |
| |
| // Set the buffer state of this client to released if it is not already in |
| // released state. |
| uint32_t current_buffer_state = |
| buffer_state_->load(std::memory_order_acquire); |
| if (BufferHubDefs::isClientReleased(current_buffer_state, |
| client_state_mask())) { |
| return 0; |
| } |
| uint32_t updated_buffer_state = current_buffer_state & (~client_state_mask()); |
| while (!buffer_state_->compare_exchange_weak( |
| current_buffer_state, updated_buffer_state, std::memory_order_acq_rel, |
| std::memory_order_acquire)) { |
| ALOGD( |
| "%s: Failed to release the buffer. Current buffer state was changed to " |
| "%" PRIx32 |
| " when trying to release the buffer and modify the buffer state to " |
| "%" PRIx32 ". About to try again.", |
| __FUNCTION__, current_buffer_state, updated_buffer_state); |
| // The failure of compare_exchange_weak updates current_buffer_state. |
| updated_buffer_state = current_buffer_state & (~client_state_mask()); |
| } |
| |
| // On release, only the user requested metadata is copied back into the shared |
| // memory for metadata. Since there are multiple consumers, it doesn't make |
| // sense to send the canonical metadata back to the producer. However, one of |
| // the consumer can still choose to write up to user_metadata_size bytes of |
| // data into user_metadata_ptr. |
| if (meta->user_metadata_ptr && meta->user_metadata_size) { |
| void* metadata_src = reinterpret_cast<void*>(meta->user_metadata_ptr); |
| memcpy(user_metadata_ptr_, metadata_src, meta->user_metadata_size); |
| } |
| |
| // Send out the release fence through the shared epoll fd. Note that during |
| // releasing the producer is not expected to be polling on the fence. |
| if (const int error = UpdateSharedFence(release_fence, shared_release_fence_)) |
| return error; |
| |
| return 0; |
| } |
| |
| int ConsumerBuffer::Release(const LocalHandle& release_fence) { |
| ATRACE_NAME("ConsumerBuffer::Release"); |
| |
| DvrNativeBufferMetadata meta; |
| if (const int error = LocalRelease(&meta, release_fence)) |
| return error; |
| |
| return ReturnStatusOrError(InvokeRemoteMethod<BufferHubRPC::ConsumerRelease>( |
| BorrowedFence(release_fence.Borrow()))); |
| } |
| |
| int ConsumerBuffer::ReleaseAsync() { |
| DvrNativeBufferMetadata meta; |
| return ReleaseAsync(&meta, LocalHandle()); |
| } |
| |
| int ConsumerBuffer::ReleaseAsync(const DvrNativeBufferMetadata* meta, |
| const LocalHandle& release_fence) { |
| ATRACE_NAME("ConsumerBuffer::ReleaseAsync"); |
| |
| if (const int error = LocalRelease(meta, release_fence)) |
| return error; |
| |
| return ReturnStatusOrError( |
| SendImpulse(BufferHubRPC::ConsumerRelease::Opcode)); |
| } |
| |
| int ConsumerBuffer::Discard() { return Release(LocalHandle()); } |
| |
| } // namespace dvr |
| } // namespace android |