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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "gpu/command_buffer/service/command_buffer_service.h"
#include <stddef.h>
#include <stdint.h>
#include <limits>
#include <memory>
#include "base/logging.h"
#include "base/memory/ptr_util.h"
#include "base/trace_event/trace_event.h"
#include "gpu/command_buffer/common/cmd_buffer_common.h"
#include "gpu/command_buffer/common/command_buffer_shared.h"
#include "gpu/command_buffer/service/transfer_buffer_manager.h"
using ::base::SharedMemory;
namespace gpu {
namespace {
class MemoryBufferBacking : public BufferBacking {
public:
explicit MemoryBufferBacking(size_t size)
: memory_(new char[size]), size_(size) {}
~MemoryBufferBacking() override {}
void* GetMemory() const override { return memory_.get(); }
size_t GetSize() const override { return size_; }
private:
std::unique_ptr<char[]> memory_;
size_t size_;
DISALLOW_COPY_AND_ASSIGN(MemoryBufferBacking);
};
} // anonymous namespace
CommandBufferService::CommandBufferService(
CommandBufferServiceClient* client,
TransferBufferManager* transfer_buffer_manager)
: client_(client), transfer_buffer_manager_(transfer_buffer_manager) {
DCHECK(client_);
DCHECK(transfer_buffer_manager_);
state_.token = 0;
}
CommandBufferService::~CommandBufferService() {}
void CommandBufferService::UpdateState() {
++state_.generation;
if (shared_state_)
shared_state_->Write(state_);
}
void CommandBufferService::Flush(int32_t put_offset,
AsyncAPIInterface* handler) {
DCHECK(handler);
if (put_offset < 0 || put_offset >= num_entries_) {
SetParseError(gpu::error::kOutOfBounds);
return;
}
TRACE_EVENT1("gpu", "CommandBufferService:PutChanged", "handler",
handler->GetLogPrefix().as_string());
put_offset_ = put_offset;
DCHECK(buffer_);
if (state_.error != error::kNoError)
return;
DCHECK(scheduled());
if (paused_) {
paused_ = false;
TRACE_COUNTER_ID1("gpu", "CommandBufferService::Paused", this, paused_);
}
handler->BeginDecoding();
int end = put_offset_ < state_.get_offset ? num_entries_ : put_offset_;
while (put_offset_ != state_.get_offset) {
int num_entries = end - state_.get_offset;
int entries_processed = 0;
error::Error error =
handler->DoCommands(kParseCommandsSlice, buffer_ + state_.get_offset,
num_entries, &entries_processed);
state_.get_offset += entries_processed;
DCHECK_LE(state_.get_offset, num_entries_);
if (state_.get_offset == num_entries_) {
end = put_offset_;
state_.get_offset = 0;
}
if (error::IsError(error)) {
SetParseError(error);
break;
}
if (client_->OnCommandBatchProcessed() ==
CommandBufferServiceClient::kPauseExecution) {
paused_ = true;
TRACE_COUNTER_ID1("gpu", "CommandBufferService::Paused", this, paused_);
break;
}
if (!scheduled())
break;
}
handler->EndDecoding();
}
void CommandBufferService::SetGetBuffer(int32_t transfer_buffer_id) {
DCHECK_EQ(put_offset_, state_.get_offset); // Only if it's empty.
put_offset_ = 0;
state_.get_offset = 0;
++state_.set_get_buffer_count;
// If the buffer is invalid we handle it gracefully.
// This means ring_buffer_ can be NULL.
ring_buffer_ = GetTransferBuffer(transfer_buffer_id);
ring_buffer_id_ = transfer_buffer_id;
if (ring_buffer_) {
int32_t size = ring_buffer_->size();
volatile void* memory = ring_buffer_->memory();
// check proper alignments.
DCHECK_EQ(
0u, (reinterpret_cast<intptr_t>(memory)) % alignof(CommandBufferEntry));
DCHECK_EQ(0u, size % sizeof(CommandBufferEntry));
num_entries_ = size / sizeof(CommandBufferEntry);
buffer_ = reinterpret_cast<volatile CommandBufferEntry*>(memory);
} else {
num_entries_ = 0;
buffer_ = nullptr;
}
UpdateState();
}
void CommandBufferService::SetSharedStateBuffer(
std::unique_ptr<BufferBacking> shared_state_buffer) {
shared_state_buffer_ = std::move(shared_state_buffer);
DCHECK(shared_state_buffer_->GetSize() >= sizeof(*shared_state_));
shared_state_ =
static_cast<CommandBufferSharedState*>(shared_state_buffer_->GetMemory());
UpdateState();
}
CommandBuffer::State CommandBufferService::GetState() {
return state_;
}
void CommandBufferService::SetReleaseCount(uint64_t release_count) {
DLOG_IF(ERROR, release_count < state_.release_count)
<< "Non-monotonic SetReleaseCount";
state_.release_count = release_count;
UpdateState();
}
scoped_refptr<Buffer> CommandBufferService::CreateTransferBuffer(size_t size,
int32_t* id) {
static int32_t next_id = 1;
*id = next_id++;
auto result = CreateTransferBufferWithId(size, *id);
if (!result)
*id = -1;
return result;
}
void CommandBufferService::DestroyTransferBuffer(int32_t id) {
transfer_buffer_manager_->DestroyTransferBuffer(id);
if (id == ring_buffer_id_) {
ring_buffer_id_ = -1;
ring_buffer_ = nullptr;
buffer_ = nullptr;
num_entries_ = 0;
state_.get_offset = 0;
put_offset_ = 0;
}
}
scoped_refptr<Buffer> CommandBufferService::GetTransferBuffer(int32_t id) {
return transfer_buffer_manager_->GetTransferBuffer(id);
}
bool CommandBufferService::RegisterTransferBuffer(
int32_t id,
std::unique_ptr<BufferBacking> buffer) {
return transfer_buffer_manager_->RegisterTransferBuffer(id,
std::move(buffer));
}
scoped_refptr<Buffer> CommandBufferService::CreateTransferBufferWithId(
size_t size,
int32_t id) {
if (!RegisterTransferBuffer(id,
base::MakeUnique<MemoryBufferBacking>(size))) {
SetParseError(gpu::error::kOutOfBounds);
return nullptr;
}
return GetTransferBuffer(id);
}
void CommandBufferService::SetToken(int32_t token) {
state_.token = token;
UpdateState();
}
void CommandBufferService::SetParseError(error::Error error) {
if (state_.error == error::kNoError) {
state_.error = error;
client_->OnParseError();
}
}
void CommandBufferService::SetContextLostReason(
error::ContextLostReason reason) {
state_.context_lost_reason = reason;
}
void CommandBufferService::SetScheduled(bool scheduled) {
TRACE_EVENT2("gpu", "CommandBufferService:SetScheduled", "this", this,
"scheduled", scheduled);
scheduled_ = scheduled;
}
} // namespace gpu
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