| /* Copyright 2018 The TensorFlow Authors. All Rights Reserved. |
| |
| 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. |
| ==============================================================================*/ |
| |
| #ifndef TENSORFLOW_COMPILER_XLA_SERVICE_GPU_OUTFEED_MANAGER_H_ |
| #define TENSORFLOW_COMPILER_XLA_SERVICE_GPU_OUTFEED_MANAGER_H_ |
| |
| #include "tensorflow/compiler/xla/literal.h" |
| #include "tensorflow/compiler/xla/service/gpu/xfeed_queue.h" |
| #include "tensorflow/compiler/xla/shape_tree.h" |
| #include "tensorflow/core/platform/mutex.h" |
| #include "tensorflow/core/platform/notification.h" |
| #include "tensorflow/core/platform/stream_executor_no_cuda.h" |
| |
| namespace xla { |
| namespace gpu { |
| |
| // TODO(b/30467474) Once GPU outfeed implementation settles, consider |
| // folding back the cpu and gpu outfeed implementations into a generic |
| // one if possible. |
| |
| // Defines a buffer holding the destination for an outfeed in host memory and a |
| // notification when that triggers when the transfer is done. |
| class OutfeedBuffer { |
| public: |
| explicit OutfeedBuffer(int64 length) : length_(length) {} |
| |
| // Waits for the device transfer to be finished. |
| void WaitUntilAvailable() { done_.WaitForNotification(); } |
| |
| int64 length() const { return length_; } |
| void set_destination(std::unique_ptr<MutableBorrowingLiteral> destination) { |
| destination_ = std::move(destination); |
| } |
| MutableBorrowingLiteral* destination() { return destination_.get(); } |
| |
| // Callback to signal that this buffer is consumed. |
| void Done() { done_.Notify(); } |
| |
| private: |
| std::unique_ptr<MutableBorrowingLiteral> destination_; |
| const int64 length_; |
| tensorflow::Notification done_; |
| }; |
| |
| // Manages a thread-safe queue of buffers. The buffers are supposed to be |
| // produced by the transfer manager and consumed by the device. |
| class OutfeedManager |
| : public XfeedQueue<ShapeTree<std::unique_ptr<OutfeedBuffer>>*> { |
| public: |
| Status TransferLiteralFromOutfeed(se::StreamExecutor* executor, |
| MutableBorrowingLiteral literal); |
| }; |
| |
| // Returns the GPU outfeed manager for the given stream executor. |
| OutfeedManager* GetOrCreateOutfeedManager(se::StreamExecutor* executor); |
| |
| } // namespace gpu |
| } // namespace xla |
| |
| #endif // TENSORFLOW_COMPILER_XLA_SERVICE_GPU_OUTFEED_MANAGER_H_ |