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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 <stdlib.h>
#if defined(OS_WIN)
#include <windows.h>
#endif
#include "base/debug/trace_event.h"
#include "base/message_loop.h"
#include "base/rand_util.h"
#include "base/string_number_conversions.h"
#include "base/stringprintf.h"
#include "base/threading/platform_thread.h"
#include "build/build_config.h"
#include "content/common/gpu/gpu_config.h"
#include "content/gpu/gpu_child_thread.h"
#include "content/gpu/gpu_info_collector.h"
#include "content/gpu/gpu_process.h"
#include "content/gpu/gpu_watchdog_thread.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/gpu_switching_option.h"
#include "content/public/common/main_function_params.h"
#include "crypto/hmac.h"
#include "ui/gl/gl_implementation.h"
#include "ui/gl/gl_surface.h"
#include "ui/gl/gl_switches.h"
#include "ui/gl/gpu_switching_manager.h"
#if defined(OS_WIN)
#include "base/win/scoped_com_initializer.h"
#include "content/common/gpu/media/dxva_video_decode_accelerator.h"
#include "sandbox/win/src/sandbox.h"
#elif defined(OS_CHROMEOS) && defined(ARCH_CPU_ARMEL) && defined(USE_X11)
#include "content/common/gpu/media/exynos_video_decode_accelerator.h"
#include "content/common/gpu/media/omx_video_decode_accelerator.h"
#elif defined(OS_CHROMEOS) && defined(ARCH_CPU_X86_FAMILY) && defined(USE_X11)
#include "content/common/gpu/media/vaapi_video_decode_accelerator.h"
#endif
#if defined(USE_X11)
#include "ui/base/x/x11_util.h"
#endif
#if defined(OS_LINUX)
#include "content/public/common/sandbox_init.h"
#endif
const int kGpuTimeout = 10000;
namespace content {
namespace {
void WarmUpSandbox(const GPUInfo&, bool);
}
// Main function for starting the Gpu process.
int GpuMain(const MainFunctionParams& parameters) {
TRACE_EVENT0("gpu", "GpuMain");
base::Time start_time = base::Time::Now();
const CommandLine& command_line = parameters.command_line;
if (command_line.HasSwitch(switches::kGpuStartupDialog)) {
ChildProcess::WaitForDebugger("Gpu");
}
if (!command_line.HasSwitch(switches::kSingleProcess)) {
#if defined(OS_WIN)
// Prevent Windows from displaying a modal dialog on failures like not being
// able to load a DLL.
SetErrorMode(
SEM_FAILCRITICALERRORS |
SEM_NOGPFAULTERRORBOX |
SEM_NOOPENFILEERRORBOX);
#elif defined(USE_X11)
ui::SetDefaultX11ErrorHandlers();
#endif
}
if (command_line.HasSwitch(switches::kSupportsDualGpus) &&
command_line.HasSwitch(switches::kGpuSwitching)) {
std::string option = command_line.GetSwitchValueASCII(
switches::kGpuSwitching);
if (option == switches::kGpuSwitchingOptionNameForceDiscrete)
ui::GpuSwitchingManager::GetInstance()->ForceUseOfDiscreteGpu();
else if (option == switches::kGpuSwitchingOptionNameForceIntegrated)
ui::GpuSwitchingManager::GetInstance()->ForceUseOfIntegratedGpu();
}
// Initialization of the OpenGL bindings may fail, in which case we
// will need to tear down this process. However, we can not do so
// safely until the IPC channel is set up, because the detection of
// early return of a child process is implemented using an IPC
// channel error. If the IPC channel is not fully set up between the
// browser and GPU process, and the GPU process crashes or exits
// early, the browser process will never detect it. For this reason
// we defer tearing down the GPU process until receiving the
// GpuMsg_Initialize message from the browser.
bool dead_on_arrival = false;
MessageLoop::Type message_loop_type = MessageLoop::TYPE_IO;
#if defined(OS_WIN)
// Unless we're running on desktop GL, we don't need a UI message
// loop, so avoid its use to work around apparent problems with some
// third-party software.
if (command_line.HasSwitch(switches::kUseGL) &&
command_line.GetSwitchValueASCII(switches::kUseGL) ==
gfx::kGLImplementationDesktopName) {
message_loop_type = MessageLoop::TYPE_UI;
}
#elif defined(OS_LINUX)
message_loop_type = MessageLoop::TYPE_DEFAULT;
#endif
MessageLoop main_message_loop(message_loop_type);
base::PlatformThread::SetName("CrGpuMain");
// In addition to disabling the watchdog if the command line switch is
// present, disable the watchdog on valgrind because the code is expected
// to run slowly in that case.
bool enable_watchdog =
!CommandLine::ForCurrentProcess()->HasSwitch(
switches::kDisableGpuWatchdog) &&
!RunningOnValgrind();
// Disable the watchdog in debug builds because they tend to only be run by
// developers who will not appreciate the watchdog killing the GPU process.
#ifndef NDEBUG
enable_watchdog = false;
#endif
bool delayed_watchdog_enable = false;
#if defined(OS_CHROMEOS)
// Don't start watchdog immediately, to allow developers to switch to VT2 on
// startup.
delayed_watchdog_enable = true;
#endif
scoped_refptr<GpuWatchdogThread> watchdog_thread;
// Start the GPU watchdog only after anything that is expected to be time
// consuming has completed, otherwise the process is liable to be aborted.
if (enable_watchdog && !delayed_watchdog_enable) {
watchdog_thread = new GpuWatchdogThread(kGpuTimeout);
watchdog_thread->Start();
}
GPUInfo gpu_info;
// Get vendor_id, device_id, driver_version from browser process through
// commandline switches.
DCHECK(command_line.HasSwitch(switches::kGpuVendorID) &&
command_line.HasSwitch(switches::kGpuDeviceID) &&
command_line.HasSwitch(switches::kGpuDriverVersion));
bool success = base::HexStringToInt(
command_line.GetSwitchValueASCII(switches::kGpuVendorID),
reinterpret_cast<int*>(&(gpu_info.gpu.vendor_id)));
DCHECK(success);
success = base::HexStringToInt(
command_line.GetSwitchValueASCII(switches::kGpuDeviceID),
reinterpret_cast<int*>(&(gpu_info.gpu.device_id)));
DCHECK(success);
gpu_info.driver_vendor =
command_line.GetSwitchValueASCII(switches::kGpuDriverVendor);
gpu_info.driver_version =
command_line.GetSwitchValueASCII(switches::kGpuDriverVersion);
GetContentClient()->SetGpuInfo(gpu_info);
// We need to track that information for the WarmUpSandbox function.
bool initialized_gl_context = false;
// Load and initialize the GL implementation and locate the GL entry points.
if (gfx::GLSurface::InitializeOneOff()) {
if (!gpu_info_collector::CollectContextGraphicsInfo(&gpu_info))
VLOG(1) << "gpu_info_collector::CollectGraphicsInfo failed";
GetContentClient()->SetGpuInfo(gpu_info);
// We know that CollectGraphicsInfo will initialize a GLContext.
initialized_gl_context = true;
#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
if (gpu_info.gpu.vendor_id == 0x10de && // NVIDIA
gpu_info.driver_vendor == "NVIDIA") {
base::ThreadRestrictions::AssertIOAllowed();
if (access("/dev/nvidiactl", R_OK) != 0) {
VLOG(1) << "NVIDIA device file /dev/nvidiactl access denied";
gpu_info.gpu_accessible = false;
dead_on_arrival = true;
}
}
#endif // OS_CHROMEOS
} else {
VLOG(1) << "gfx::GLSurface::InitializeOneOff failed";
gpu_info.gpu_accessible = false;
gpu_info.finalized = true;
dead_on_arrival = true;
}
if (enable_watchdog && delayed_watchdog_enable) {
watchdog_thread = new GpuWatchdogThread(kGpuTimeout);
watchdog_thread->Start();
}
// OSMesa is expected to run very slowly, so disable the watchdog in that
// case.
if (enable_watchdog &&
gfx::GetGLImplementation() == gfx::kGLImplementationOSMesaGL) {
watchdog_thread->Stop();
watchdog_thread = NULL;
}
{
const bool should_initialize_gl_context = !initialized_gl_context &&
!dead_on_arrival;
// Warm up the current process before enabling the sandbox.
WarmUpSandbox(gpu_info, should_initialize_gl_context);
}
#if defined(OS_LINUX)
{
TRACE_EVENT0("gpu", "Initialize sandbox");
bool do_init_sandbox = true;
#if defined(OS_CHROMEOS) && defined(NDEBUG)
// On Chrome OS and when not on a debug build, initialize
// the GPU process' sandbox only for Intel GPUs.
do_init_sandbox = gpu_info.gpu.vendor_id == 0x8086; // Intel GPU.
#endif
if (do_init_sandbox) {
if (watchdog_thread.get())
watchdog_thread->Stop();
gpu_info.sandboxed = InitializeSandbox();
if (watchdog_thread.get())
watchdog_thread->Start();
}
}
#endif
#if defined(OS_WIN)
{
TRACE_EVENT0("gpu", "Lower token");
// For windows, if the target_services interface is not zero, the process
// is sandboxed and we must call LowerToken() before rendering untrusted
// content.
sandbox::TargetServices* target_services =
parameters.sandbox_info->target_services;
if (target_services) {
target_services->LowerToken();
gpu_info.sandboxed = true;
}
}
#endif
GpuProcess gpu_process;
GpuChildThread* child_thread = new GpuChildThread(watchdog_thread.get(),
dead_on_arrival, gpu_info);
child_thread->Init(start_time);
gpu_process.set_main_thread(child_thread);
{
TRACE_EVENT0("gpu", "Run Message Loop");
main_message_loop.Run();
}
child_thread->StopWatchdog();
return 0;
}
namespace {
#if defined(OS_LINUX)
void CreateDummyGlContext() {
scoped_refptr<gfx::GLSurface> surface(
gfx::GLSurface::CreateOffscreenGLSurface(false, gfx::Size(1, 1)));
if (!surface.get()) {
VLOG(1) << "gfx::GLSurface::CreateOffscreenGLSurface failed";
return;
}
// On Linux, this is needed to make sure /dev/nvidiactl has
// been opened and its descriptor cached.
scoped_refptr<gfx::GLContext> context(
gfx::GLContext::CreateGLContext(NULL,
surface,
gfx::PreferDiscreteGpu));
if (!context.get()) {
VLOG(1) << "gfx::GLContext::CreateGLContext failed";
return;
}
// Similarly, this is needed for /dev/nvidia0.
if (context->MakeCurrent(surface)) {
context->ReleaseCurrent(surface.get());
} else {
VLOG(1) << "gfx::GLContext::MakeCurrent failed";
}
}
#endif
void WarmUpSandbox(const GPUInfo& gpu_info,
bool should_initialize_gl_context) {
{
TRACE_EVENT0("gpu", "Warm up rand");
// Warm up the random subsystem, which needs to be done pre-sandbox on all
// platforms.
(void) base::RandUint64();
}
{
TRACE_EVENT0("gpu", "Warm up HMAC");
// Warm up the crypto subsystem, which needs to done pre-sandbox on all
// platforms.
crypto::HMAC hmac(crypto::HMAC::SHA256);
unsigned char key = '\0';
bool ret = hmac.Init(&key, sizeof(key));
(void) ret;
}
#if defined(OS_CHROMEOS) && defined(ARCH_CPU_ARMEL) && defined(USE_X11)
if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kUseExynosVda))
ExynosVideoDecodeAccelerator::PreSandboxInitialization();
else
OmxVideoDecodeAccelerator::PreSandboxInitialization();
#elif defined(OS_CHROMEOS) && defined(ARCH_CPU_X86_FAMILY) && defined(USE_X11)
VaapiVideoDecodeAccelerator::PreSandboxInitialization();
#endif
#if defined(OS_LINUX)
// We special case Optimus since the vendor_id we see may not be Nvidia.
bool uses_nvidia_driver = (gpu_info.gpu.vendor_id == 0x10de && // NVIDIA.
gpu_info.driver_vendor == "NVIDIA") ||
gpu_info.optimus;
if (uses_nvidia_driver && should_initialize_gl_context) {
// We need this on Nvidia to pre-open /dev/nvidiactl and /dev/nvidia0.
CreateDummyGlContext();
}
#endif
#if defined(OS_WIN)
{
TRACE_EVENT0("gpu", "Initialize COM");
base::win::ScopedCOMInitializer com_initializer;
}
{
TRACE_EVENT0("gpu", "Preload setupapi.dll");
// Preload this DLL because the sandbox prevents it from loading.
LoadLibrary(L"setupapi.dll");
}
{
TRACE_EVENT0("gpu", "Initialize DXVA");
// Initialize H/W video decoding stuff which fails in the sandbox.
DXVAVideoDecodeAccelerator::PreSandboxInitialization();
}
#endif
}
} // namespace.
} // namespace content
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