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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.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/390223051): Remove C-library calls to fix the errors.
#pragma allow_unsafe_libc_calls
#endif
#include "gpu/command_buffer/client/dawn_client_memory_transfer_service.h"
#include "base/memory/raw_ptr.h"
#include "gpu/command_buffer/client/cmd_buffer_helper.h"
#include "gpu/command_buffer/client/mapped_memory.h"
#include "gpu/command_buffer/common/dawn_memory_transfer_handle.h"
namespace gpu {
namespace webgpu {
class DawnClientMemoryTransferService::ReadHandleImpl
: public dawn::wire::client::MemoryTransferService::ReadHandle {
public:
ReadHandleImpl(void* ptr,
MemoryTransferHandle handle,
DawnClientMemoryTransferService* service)
: ReadHandle(), ptr_(ptr), handle_(handle), service_(service) {}
~ReadHandleImpl() override {
// The shared memory can't be freed until the server consumes it. Add the
// the pointer to a list of blocks to process on the next Flush.
service_->MarkHandleFree(ptr_);
}
// Get the serialization size of SerializeCreate.
size_t SerializeCreateSize() override { return sizeof(MemoryTransferHandle); }
// Serialize the handle into |serialize_pointer| so it can be received by the
// service.
void SerializeCreate(void* serialize_pointer) override {
*reinterpret_cast<MemoryTransferHandle*>(serialize_pointer) = handle_;
}
const void* GetData() override { return ptr_; }
bool DeserializeDataUpdate(const void* deserialize_pointer,
size_t deserialize_size,
size_t offset,
size_t size) override {
// No data is deserialized because we're using shared memory.
DCHECK_EQ(deserialize_size, 0u);
return true;
}
private:
raw_ptr<void> ptr_; // Pointer to client-side shared memory.
MemoryTransferHandle handle_;
raw_ptr<DawnClientMemoryTransferService> service_;
};
class DawnClientMemoryTransferService::WriteHandleImpl
: public dawn::wire::client::MemoryTransferService::WriteHandle {
public:
WriteHandleImpl(void* ptr,
MemoryTransferHandle handle,
DawnClientMemoryTransferService* service)
: WriteHandle(), ptr_(ptr), handle_(handle), service_(service) {}
~WriteHandleImpl() override {
// The shared memory can't be freed until the server consumes it. Add
// the pointer to a list of blocks to process on the next Flush.
service_->MarkHandleFree(ptr_);
}
// Get the serialization size of SerializeCreate.
size_t SerializeCreateSize() override { return sizeof(MemoryTransferHandle); }
// Serialize the handle into |serialize_pointer| so it can be received by the
// service.
void SerializeCreate(void* serialize_pointer) override {
*reinterpret_cast<MemoryTransferHandle*>(serialize_pointer) = handle_;
}
void* GetData() override { return ptr_; }
size_t SizeOfSerializeDataUpdate(size_t offset, size_t size) override {
// No data is serialized because we're using shared memory.
return 0;
}
void SerializeDataUpdate(void* serialize_pointer,
size_t offset,
size_t size) override {
// No data is serialized because we're using shared memory.
}
private:
raw_ptr<void> ptr_;
MemoryTransferHandle handle_;
raw_ptr<DawnClientMemoryTransferService> service_;
};
DawnClientMemoryTransferService::DawnClientMemoryTransferService(
MappedMemoryManager* mapped_memory)
: dawn::wire::client::MemoryTransferService(),
mapped_memory_(mapped_memory) {}
DawnClientMemoryTransferService::~DawnClientMemoryTransferService() = default;
dawn::wire::client::MemoryTransferService::ReadHandle*
DawnClientMemoryTransferService::CreateReadHandle(size_t size) {
MemoryTransferHandle handle = {};
void* ptr = AllocateHandle(size, &handle);
if (ptr == nullptr) {
return nullptr;
}
return new ReadHandleImpl(ptr, handle, this);
}
dawn::wire::client::MemoryTransferService::WriteHandle*
DawnClientMemoryTransferService::CreateWriteHandle(size_t size) {
MemoryTransferHandle handle = {};
void* ptr = AllocateHandle(size, &handle);
if (ptr == nullptr) {
return nullptr;
}
// Zero-initialize the data.
memset(ptr, 0, handle.size);
return new WriteHandleImpl(ptr, handle, this);
}
void* DawnClientMemoryTransferService::AllocateHandle(
size_t size,
MemoryTransferHandle* handle) {
if (size > std::numeric_limits<uint32_t>::max() || disconnected_) {
return nullptr;
}
DCHECK(handle);
handle->size = static_cast<uint32_t>(size);
// If size is zero, actually allocate a byte to prevent later failures
size_t alloc_size = size == 0 ? 1 : size;
DCHECK(mapped_memory_);
return mapped_memory_->Alloc(
alloc_size, &handle->shm_id, &handle->shm_offset,
TransferBufferAllocationOption::kReturnNullOnOOM);
}
void DawnClientMemoryTransferService::MarkHandleFree(void* ptr) {
free_blocks_.push_back(ptr);
}
void DawnClientMemoryTransferService::FreeHandles(CommandBufferHelper* helper) {
std::vector<raw_ptr<void, VectorExperimental>> to_free =
std::move(free_blocks_);
if (to_free.size() > 0) {
int32_t token = helper->InsertToken();
for (void* ptr : to_free) {
mapped_memory_->FreePendingToken(ptr, token);
}
}
}
void DawnClientMemoryTransferService::Disconnect() {
disconnected_ = true;
}
} // namespace webgpu
} // namespace gpu
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