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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef GPU_COMMAND_BUFFER_CLIENT_DAWN_CLIENT_MEMORY_TRANSFER_SERVICE_H_
#define GPU_COMMAND_BUFFER_CLIENT_DAWN_CLIENT_MEMORY_TRANSFER_SERVICE_H_
#include <dawn/wire/WireClient.h>
#include <vector>
#include "base/memory/raw_ptr.h"
namespace gpu {
class CommandBufferHelper;
class MappedMemoryManager;
namespace webgpu {
struct MemoryTransferHandle;
class DawnClientMemoryTransferService
: public dawn::wire::client::MemoryTransferService {
public:
DawnClientMemoryTransferService(MappedMemoryManager* mapped_memory);
~DawnClientMemoryTransferService() override;
// Create a handle for reading shared memory data.
// This may fail and return nullptr.
ReadHandle* CreateReadHandle(size_t size) override;
// Create a handle for writing shared memory data.
// This may fail and return nullptr.
WriteHandle* CreateWriteHandle(size_t size) override;
// Free shared memory allocations after the next token passes on the GPU
// process.
void FreeHandles(CommandBufferHelper* helper);
void Disconnect();
private:
class ReadHandleImpl;
class WriteHandleImpl;
// Allocate a shared memory handle for the memory transfer.
void* AllocateHandle(size_t size, MemoryTransferHandle* handle);
// Mark a shared memory allocation as free. This should not be called more
// than once per block.
void MarkHandleFree(void* ptr);
// Found dangling on `linux-rel` in
// `gpu_tests.context_lost_integration_test.ContextLostIntegrationTest.
// ContextLost_WebGPUStressRequestDeviceAndRemoveLoop`
raw_ptr<MappedMemoryManager, DanglingUntriaged> mapped_memory_;
// Pointers to memory allocated by the MappedMemoryManager to free after
// the next Flush.
std::vector<raw_ptr<void, VectorExperimental>> free_blocks_;
// If disconnected, new handle creation always returns null.
bool disconnected_ = false;
};
} // namespace webgpu
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_CLIENT_DAWN_CLIENT_MEMORY_TRANSFER_SERVICE_H_
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