[8/8][Ozone-Dri] Pass DRM FD to GPU process on hotplug event

ui/ozone/platform/dri/ozone_platform_gbm.cc

 // Copyright 2014 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 "ui/ozone/platform/dri/ozone_platform_gbm.h"
 
 #include <dlfcn.h>
 #include <gbm.h>
 #include <stdlib.h>
 
 #include "base/at_exit.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "ui/base/cursor/ozone/bitmap_cursor_factory_ozone.h"
 #include "ui/events/ozone/device/device_manager.h"
 #include "ui/events/ozone/evdev/event_factory_evdev.h"
 #include "ui/events/ozone/layout/keyboard_layout_engine_manager.h"
 #include "ui/ozone/platform/dri/display_manager.h"
 #include "ui/ozone/platform/dri/dri_cursor.h"
 #include "ui/ozone/platform/dri/dri_gpu_platform_support.h"
 #include "ui/ozone/platform/dri/dri_gpu_platform_support_host.h"
 #include "ui/ozone/platform/dri/dri_util.h"
 #include "ui/ozone/platform/dri/dri_window.h"
 #include "ui/ozone/platform/dri/dri_window_delegate_manager.h"
 #include "ui/ozone/platform/dri/dri_window_manager.h"
+#include "ui/ozone/platform/dri/drm_device_generator.h"
 #include "ui/ozone/platform/dri/drm_device_manager.h"
 #include "ui/ozone/platform/dri/gbm_buffer.h"
 #include "ui/ozone/platform/dri/gbm_surface.h"
 #include "ui/ozone/platform/dri/gbm_surface_factory.h"
 #include "ui/ozone/platform/dri/gbm_wrapper.h"
 #include "ui/ozone/platform/dri/native_display_delegate_dri.h"
 #include "ui/ozone/platform/dri/native_display_delegate_proxy.h"
 #include "ui/ozone/platform/dri/scanout_buffer.h"
 #include "ui/ozone/platform/dri/screen_manager.h"
 #include "ui/ozone/public/cursor_factory_ozone.h"
@@ skipping 31 matching lines @@
   void* glapi_lib_;
 
   DISALLOW_COPY_AND_ASSIGN(GlApiLoader);
 };
 
 class GbmBufferGenerator : public ScanoutBufferGenerator {
  public:
   GbmBufferGenerator() {}
   ~GbmBufferGenerator() override {}
 
+  // ScanoutBufferGenerator:
   scoped_refptr<ScanoutBuffer> Create(const scoped_refptr<DriWrapper>& drm,
                                       const gfx::Size& size) override {
     scoped_refptr<GbmWrapper> gbm(static_cast<GbmWrapper*>(drm.get()));
     return GbmBuffer::CreateBuffer(gbm, SurfaceFactoryOzone::RGBA_8888, size,
                                    true);
   }
 
  protected:
   DISALLOW_COPY_AND_ASSIGN(GbmBufferGenerator);
 };
 
+class GbmDeviceGenerator : public DrmDeviceGenerator {
+ public:
+  GbmDeviceGenerator() {}
+  ~GbmDeviceGenerator() override {}
+
+  // DrmDeviceGenerator:
+  scoped_refptr<DriWrapper> CreateDevice(const base::FilePath& path,
+                                         base::File file) override {
+    scoped_refptr<DriWrapper> drm = new GbmWrapper(path, file.Pass());
+    drm->Initialize();
+    return drm;
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(GbmDeviceGenerator);
+};
+
 class OzonePlatformGbm : public OzonePlatform {
  public:
   OzonePlatformGbm(bool use_surfaceless) : use_surfaceless_(use_surfaceless) {
   }
   ~OzonePlatformGbm() override {}
 
   // OzonePlatform:
   ui::SurfaceFactoryOzone* GetSurfaceFactoryOzone() override {
     return surface_factory_ozone_.get();
   }
@@ skipping 63 matching lines @@
     // This makes sure that simple targets that do not handle display
     // configuration can still use the primary display.
     ForceInitializationOfPrimaryDisplay(gbm_, screen_manager_.get());
 
     window_delegate_manager_.reset(new DriWindowDelegateManager());
     if (!surface_factory_ozone_)
       surface_factory_ozone_.reset(new GbmSurfaceFactory(use_surfaceless_));
 
     surface_factory_ozone_->InitializeGpu(gbm_, drm_device_manager_.get(),
                                           window_delegate_manager_.get());
-    scoped_ptr<NativeDisplayDelegateDri> ndd(
-        new NativeDisplayDelegateDri(screen_manager_.get(), gbm_));
+    scoped_ptr<NativeDisplayDelegateDri> ndd(new NativeDisplayDelegateDri(
+        screen_manager_.get(), gbm_,
+        scoped_ptr<DrmDeviceGenerator>(new GbmDeviceGenerator())));
     gpu_platform_support_.reset(new DriGpuPlatformSupport(
         drm_device_manager_.get(), window_delegate_manager_.get(),
         screen_manager_.get(), ndd.Pass()));
   }
 
  private:
   bool use_surfaceless_;
   scoped_ptr<GlApiLoader> gl_api_loader_;
   scoped_refptr<GbmWrapper> gbm_;
   scoped_ptr<DrmDeviceManager> drm_device_manager_;
@@ skipping 26 matching lines @@
 OzonePlatform* CreateOzonePlatformGbm() {
   base::CommandLine* cmd = base::CommandLine::ForCurrentProcess();
 #if defined(USE_MESA_PLATFORM_NULL)
   // Only works with surfaceless.
   cmd->AppendSwitch(switches::kOzoneUseSurfaceless);
 #endif
   return new OzonePlatformGbm(cmd->HasSwitch(switches::kOzoneUseSurfaceless));
 }
 
 }  // namespace ui