drm: GPU process manages VGEM fd.

ui/ozone/platform/drm/host/drm_display_host_manager.cc

Index: ui/ozone/platform/drm/host/drm_display_host_manager.cc
diff --git a/ui/ozone/platform/drm/host/drm_display_host_manager.cc b/ui/ozone/platform/drm/host/drm_display_host_manager.cc
index 93d43e2467de430ae2cec6ce1655f6eb33dd403d..05aeb2d2a7e8c7cbdb7e28be0cbd50d7ddb59777 100644
--- a/ui/ozone/platform/drm/host/drm_display_host_manager.cc
+++ b/ui/ozone/platform/drm/host/drm_display_host_manager.cc
@@ -31,6 +31,7 @@ typedef base::Callback<void(const base::FilePath&, scoped_ptr<DrmDeviceHandle>)>
     OnOpenDeviceReplyCallback;
 
 const char kDefaultGraphicsCardPattern[] = "/dev/dri/card%d";
+const char kVGEMCardPattern[] = "/sys/bus/platform/devices/vgem/drm/card%d";
 
 const char* kDisplayActionString[] = {
     "ADD",
@@ -40,10 +41,11 @@ const char* kDisplayActionString[] = {
 
 void OpenDeviceOnWorkerThread(
     const base::FilePath& path,
+    bool is_vgem,
     const scoped_refptr<base::TaskRunner>& reply_runner,
     const OnOpenDeviceReplyCallback& callback) {
   scoped_ptr<DrmDeviceHandle> handle(new DrmDeviceHandle());
-  handle->Initialize(path);
+  handle->Initialize(path, is_vgem);
   reply_runner->PostTask(
       FROM_HERE, base::Bind(callback, path, base::Passed(handle.Pass())));
 }
@@ -112,7 +114,7 @@ DrmDisplayHostManager::DrmDisplayHostManager(DrmGpuPlatformSupportHost* proxy,
     // graphics state.
     base::ThreadRestrictions::ScopedAllowIO allow_io;
     scoped_ptr<DrmDeviceHandle> handle(new DrmDeviceHandle());
-    if (!handle->Initialize(primary_graphics_card_path_)) {
+    if (!handle->Initialize(primary_graphics_card_path_, false)) {
       LOG(FATAL) << "Failed to open primary graphics card";
       return;
     }
@@ -249,7 +251,20 @@ void DrmDisplayHostManager::OnDeviceEvent(const DeviceEvent& event) {
   if (event.device_type() != DeviceEvent::DISPLAY)
     return;
 
-  event_queue_.push(DisplayEvent(event.action_type(), event.path()));
+  bool is_vgem = false;
+  for (int i = 0; i < 16; i++) {
+    struct stat vgem_stat;
+    std::string vgem_path = base::StringPrintf(kVGEMCardPattern, i);
+    if (stat(vgem_path.c_str(), &vgem_stat) == -1)
+      continue;
+
+    std::string card_path = base::StringPrintf(kDefaultGraphicsCardPattern, i);
+    if (card_path == event.path().value())
+      is_vgem = true;
+    break;
+  }
+
+  event_queue_.push(DisplayEvent(event.action_type(), event.path(), is_vgem));
   ProcessEvent();
 }
 
@@ -264,7 +279,7 @@ void DrmDisplayHostManager::ProcessEvent() {
         if (drm_devices_.find(event.path) == drm_devices_.end()) {
           task_pending_ = base::WorkerPool::PostTask(
               FROM_HERE,
-              base::Bind(&OpenDeviceOnWorkerThread, event.path,
+              base::Bind(&OpenDeviceOnWorkerThread, event.path, event.is_vgem,
                          base::ThreadTaskRunnerHandle::Get(),
                          base::Bind(&DrmDisplayHostManager::OnAddGraphicsDevice,
                                     weak_ptr_factory_.GetWeakPtr())),
@@ -305,7 +320,7 @@ void DrmDisplayHostManager::OnAddGraphicsDevice(
     base::ScopedFD file = handle->Duplicate();
     drm_devices_.add(path, handle.Pass());
     proxy_->Send(new OzoneGpuMsg_AddGraphicsDevice(
-        path, base::FileDescriptor(file.Pass())));
+        path, base::FileDescriptor(file.Pass()), handle->IsVgem()));
     NotifyDisplayDelegate();
   }
 
@@ -335,12 +350,14 @@ void DrmDisplayHostManager::OnChannelEstablished(
   // Send the primary device first since this is used to initialize graphics
   // state.
   proxy_->Send(new OzoneGpuMsg_AddGraphicsDevice(
-      it->first, base::FileDescriptor(it->second->Duplicate())));
+      it->first, base::FileDescriptor(it->second->Duplicate()),
+      it->second->IsVgem()));
 
   for (auto pair : drm_devices_) {
     if (pair.second->IsValid() && pair.first != primary_graphics_card_path_) {
       proxy_->Send(new OzoneGpuMsg_AddGraphicsDevice(
-          pair.first, base::FileDescriptor(pair.second->Duplicate())));
+          pair.first, base::FileDescriptor(pair.second->Duplicate()),
+          it->second->IsVgem()));
     }
   }