drm: GPU process manages VGEM fd.

ui/ozone/platform/drm/gpu/drm_device.h

 // 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.
 
 #ifndef UI_OZONE_PLATFORM_DRM_GPU_DRM_DEVICE_H_
 #define UI_OZONE_PLATFORM_DRM_GPU_DRM_DEVICE_H_
 
-#include <stdint.h>
-
-#include <vector>
-
 #include "base/callback.h"
 #include "base/files/file.h"
-#include "base/files/file_path.h"
-#include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_vector.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/rect_f.h"
 #include "ui/gfx/overlay_transform.h"
 #include "ui/ozone/ozone_export.h"
 #include "ui/ozone/platform/drm/common/scoped_drm_types.h"
 #include "ui/ozone/platform/drm/gpu/hardware_display_plane_manager.h"
 
 typedef struct _drmEventContext drmEventContext;
 typedef struct _drmModeModeInfo drmModeModeInfo;
 
 struct SkImageInfo;
 
 namespace base {
 class SingleThreadTaskRunner;
 }  // namespace base
 
 namespace ui {
 
 class HardwareDisplayPlaneManager;
 struct GammaRampRGBEntry;
 
+// Wraps /dev/dri/cardX device.
+class OZONE_EXPORT DrmDeviceBase
+    : public base::RefCountedThreadSafe<DrmDeviceBase> {
+ public:
+  // |task_runner| will be used to asynchronously page flip.
+  virtual void InitializeTaskRunner(
+      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner) = 0;
+
+  enum Type { DRM, VGEM };
+  virtual Type GetType() const = 0;
+
+  int get_fd() const { return file_.GetPlatformFile(); }
+  base::FilePath device_path() const { return device_path_; }
+
+ protected:
+  friend class base::RefCountedThreadSafe<DrmDeviceBase>;
+  DrmDeviceBase(const base::FilePath& device_path, base::File file);
+  virtual ~DrmDeviceBase();
+
+  // Path to GEM device.
+  const base::FilePath device_path_;
+
+  // GEM device.
+  base::File file_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DrmDeviceBase);
+};
+
 // Wraps DRM calls into a nice interface. Used to provide different
 // implementations of the DRM calls. For the actual implementation the DRM API
 // would be called. In unit tests this interface would be stubbed.
-class OZONE_EXPORT DrmDevice : public base::RefCountedThreadSafe<DrmDevice> {
+class OZONE_EXPORT DrmDevice : public DrmDeviceBase {
  public:
   typedef base::Callback<void(unsigned int /* frame */,
                               unsigned int /* seconds */,
                               unsigned int /* useconds */)> PageFlipCallback;
 
-  DrmDevice(const base::FilePath& device_path);
   DrmDevice(const base::FilePath& device_path, base::File file);
 
+  // GemDevice implementation:
+  void InitializeTaskRunner(
+      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner) override;
+  Type GetType() const override;
+
   // Open device.
   virtual bool Initialize();
 
-  // |task_runner| will be used to asynchronously page flip.
-  virtual void InitializeTaskRunner(
-      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
-
   // Get the CRTC state. This is generally used to save state before using the
   // CRTC. When the user finishes using the CRTC, the user should restore the
   // CRTC to it's initial state. Use |SetCrtc| to restore the state.
   virtual ScopedDrmCrtcPtr GetCrtc(uint32_t crtc_id);
 
   // Used to configure CRTC with ID |crtc_id| to use the connector in
   // |connectors|. The CRTC will be configured with mode |mode| and will display
   // the framebuffer with ID |framebuffer|. Before being able to display the
   // framebuffer, it should be registered with the CRTC using |AddFramebuffer|.
   virtual bool SetCrtc(uint32_t crtc_id,
@@ skipping 97 matching lines @@
   // Set the gamma ramp for |crtc_id| to reflect the ramps in |lut|.
   virtual bool SetGammaRamp(uint32_t crtc_id,
                             const std::vector<GammaRampRGBEntry>& lut);
 
   virtual bool SetCapability(uint64_t capability, uint64_t value);
 
   // Drm master related
   virtual bool SetMaster();
   virtual bool DropMaster();
 
-  int get_fd() const { return file_.GetPlatformFile(); }
-
-  base::FilePath device_path() const { return device_path_; }
-
   HardwareDisplayPlaneManager* plane_manager() { return plane_manager_.get(); }
 
  protected:
-  friend class base::RefCountedThreadSafe<DrmDevice>;
-
-  virtual ~DrmDevice();
+  ~DrmDevice() override;
 
   scoped_ptr<HardwareDisplayPlaneManager> plane_manager_;
 
  private:
   class IOWatcher;
   class PageFlipManager;
 
-  // Path to DRM device.
-  const base::FilePath device_path_;
-
-  // DRM device.
-  base::File file_;
-
   // Helper thread to perform IO listener operations.
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 
   // Watcher for |fd_| listening for page flip events.
   scoped_refptr<IOWatcher> watcher_;
 
   scoped_refptr<PageFlipManager> page_flip_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(DrmDevice);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_GPU_DRM_DEVICE_H_