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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 <stddef.h>
#include <stdint.h>
#include <memory>
#include <string>
#include <vector>
#include "base/atomic_sequence_num.h"
#include "base/containers/scoped_ptr_hash_map.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/process/process.h"
#include "base/synchronization/lock.h"
#include "gpu/config/gpu_info.h"
#include "gpu/gpu_export.h"
#include "gpu/ipc/common/gpu_stream_constants.h"
#include "gpu/ipc/common/surface_handle.h"
#include "ipc/ipc_channel_handle.h"
#include "ipc/ipc_sync_channel.h"
#include "ipc/message_filter.h"
#include "ipc/message_router.h"
#include "ui/events/latency_info.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/gpu_memory_buffer.h"
#include "ui/gl/gpu_preference.h"
class GURL;
namespace base {
class WaitableEvent;
namespace IPC {
class SyncMessageFilter;
namespace gpu {
class GpuMemoryBufferManager;
namespace gpu {
class CommandBufferProxyImpl;
class GpuChannelHost;
class GPU_EXPORT GpuChannelHostFactory {
virtual ~GpuChannelHostFactory() {}
virtual bool IsMainThread() = 0;
virtual scoped_refptr<base::SingleThreadTaskRunner>
GetIOThreadTaskRunner() = 0;
virtual std::unique_ptr<base::SharedMemory> AllocateSharedMemory(
size_t size) = 0;
// Encapsulates an IPC channel between the client and one GPU process.
// On the GPU process side there's a corresponding GpuChannel.
// Every method can be called on any thread with a message loop, except for the
// IO thread.
class GPU_EXPORT GpuChannelHost
: public IPC::Sender,
public base::RefCountedThreadSafe<GpuChannelHost> {
// Must be called on the main thread (as defined by the factory).
static scoped_refptr<GpuChannelHost> Create(
GpuChannelHostFactory* factory,
int channel_id,
const gpu::GPUInfo& gpu_info,
const IPC::ChannelHandle& channel_handle,
base::WaitableEvent* shutdown_event,
gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager);
static const int32_t kDefaultStreamId = gpu::GPU_STREAM_DEFAULT;
static const gpu::GpuStreamPriority kDefaultStreamPriority =
bool IsLost() const {
return channel_filter_->IsLost();
int channel_id() const { return channel_id_; }
// The GPU stats reported by the GPU process.
const gpu::GPUInfo& gpu_info() const { return gpu_info_; }
// IPC::Sender implementation:
bool Send(IPC::Message* msg) override;
// Set an ordering barrier. AsyncFlushes any pending barriers on other
// routes. Combines multiple OrderingBarriers into a single AsyncFlush.
// Returns the flush ID for the stream or 0 if put offset was not changed.
uint32_t OrderingBarrier(int32_t route_id,
int32_t stream_id,
int32_t put_offset,
uint32_t flush_count,
const std::vector<ui::LatencyInfo>& latency_info,
bool put_offset_changed,
bool do_flush);
void FlushPendingStream(int32_t stream_id);
// Create and connect to a command buffer in the GPU process.
std::unique_ptr<CommandBufferProxyImpl> CreateCommandBuffer(
gpu::SurfaceHandle surface_handle,
const gfx::Size& size,
CommandBufferProxyImpl* share_group,
int32_t stream_id,
gpu::GpuStreamPriority stream_priority,
const std::vector<int32_t>& attribs,
const GURL& active_url,
gfx::GpuPreference gpu_preference);
// Destroy a command buffer created by this channel.
void DestroyCommandBuffer(CommandBufferProxyImpl* command_buffer);
// Destroy this channel. Must be called on the main thread, before
// destruction.
void DestroyChannel();
// Add a message route for the current message loop.
void AddRoute(int route_id, base::WeakPtr<IPC::Listener> listener);
// Add a message route to be handled on the provided |task_runner|.
void AddRouteWithTaskRunner(
int route_id,
base::WeakPtr<IPC::Listener> listener,
scoped_refptr<base::SingleThreadTaskRunner> task_runner);
// Remove the message route associated with |route_id|.
void RemoveRoute(int route_id);
GpuChannelHostFactory* factory() const { return factory_; }
gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager() const {
return gpu_memory_buffer_manager_;
// Returns a handle to the shared memory that can be sent via IPC to the
// GPU process. The caller is responsible for ensuring it is closed. Returns
// an invalid handle on failure.
base::SharedMemoryHandle ShareToGpuProcess(
base::SharedMemoryHandle source_handle);
// Reserve one unused transfer buffer ID.
int32_t ReserveTransferBufferId();
// Returns a GPU memory buffer handle to the buffer that can be sent via
// IPC to the GPU process. The caller is responsible for ensuring it is
// closed. Returns an invalid handle on failure.
gfx::GpuMemoryBufferHandle ShareGpuMemoryBufferToGpuProcess(
const gfx::GpuMemoryBufferHandle& source_handle,
bool* requires_sync_point);
// Reserve one unused image ID.
int32_t ReserveImageId();
// Generate a route ID guaranteed to be unique for this channel.
int32_t GenerateRouteID();
// Generate a stream ID guaranteed to be unique for this channel.
int32_t GenerateStreamID();
// Sends a synchronous nop to the server which validate that all previous IPC
// messages have been received. Once the synchronous nop has been sent to the
// server all previous flushes will all be marked as validated, including
// flushes for other streams on the same channel. Once a validation has been
// sent, it will return the highest validated flush id for the stream.
// If the validation fails (which can only happen upon context lost), the
// highest validated flush id will not change. If no flush ID were ever
// validated then it will return 0 (Note the lowest valid flush ID is 1).
uint32_t ValidateFlushIDReachedServer(int32_t stream_id, bool force_validate);
// Returns the highest validated flush ID for a given stream.
uint32_t GetHighestValidatedFlushID(int32_t stream_id);
friend class base::RefCountedThreadSafe<GpuChannelHost>;
// A filter used internally to route incoming messages from the IO thread
// to the correct message loop. It also maintains some shared state between
// all the contexts.
class MessageFilter : public IPC::MessageFilter {
// Called on the IO thread.
void AddRoute(int32_t route_id,
base::WeakPtr<IPC::Listener> listener,
scoped_refptr<base::SingleThreadTaskRunner> task_runner);
// Called on the IO thread.
void RemoveRoute(int32_t route_id);
// IPC::MessageFilter implementation
// (called on the IO thread):
bool OnMessageReceived(const IPC::Message& msg) override;
void OnChannelError() override;
// The following methods can be called on any thread.
// Whether the channel is lost.
bool IsLost() const;
struct ListenerInfo {
ListenerInfo(const ListenerInfo& other);
base::WeakPtr<IPC::Listener> listener;
scoped_refptr<base::SingleThreadTaskRunner> task_runner;
~MessageFilter() override;
// Threading notes: |listeners_| is only accessed on the IO thread. Every
// other field is protected by |lock_|.
base::hash_map<int32_t, ListenerInfo> listeners_;
// Protects all fields below this one.
mutable base::Lock lock_;
// Whether the channel has been lost.
bool lost_;
struct StreamFlushInfo {
StreamFlushInfo(const StreamFlushInfo& other);
// These are global per stream.
uint32_t next_stream_flush_id;
uint32_t flushed_stream_flush_id;
uint32_t verified_stream_flush_id;
// These are local per context.
bool flush_pending;
int32_t route_id;
int32_t put_offset;
uint32_t flush_count;
uint32_t flush_id;
std::vector<ui::LatencyInfo> latency_info;
GpuChannelHost(GpuChannelHostFactory* factory,
int channel_id,
const gpu::GPUInfo& gpu_info,
gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager);
~GpuChannelHost() override;
void Connect(const IPC::ChannelHandle& channel_handle,
base::WaitableEvent* shutdown_event);
bool InternalSend(IPC::Message* msg);
void InternalFlush(StreamFlushInfo* flush_info);
// Threading notes: all fields are constant during the lifetime of |this|
// except:
// - |next_image_id_|, atomic type
// - |next_route_id_|, atomic type
// - |next_stream_id_|, atomic type
// - |channel_| and |stream_flush_info_|, protected by |context_lock_|
GpuChannelHostFactory* const factory_;
const int channel_id_;
const gpu::GPUInfo gpu_info_;
scoped_refptr<MessageFilter> channel_filter_;
gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager_;
// A filter for sending messages from thread other than the main thread.
scoped_refptr<IPC::SyncMessageFilter> sync_filter_;
// Image IDs are allocated in sequence.
base::AtomicSequenceNumber next_image_id_;
// Route IDs are allocated in sequence.
base::AtomicSequenceNumber next_route_id_;
// Stream IDs are allocated in sequence.
base::AtomicSequenceNumber next_stream_id_;
// Protects channel_ and stream_flush_info_.
mutable base::Lock context_lock_;
std::unique_ptr<IPC::SyncChannel> channel_;
base::hash_map<int32_t, StreamFlushInfo> stream_flush_info_;
} // namespace gpu