Bug 1696071 - Add support for DMABuf to the blocklist. r=rmader

Differential Revision: https://phabricator.services.mozilla.com/D107019

gfx/config/gfxFeature.h

@@ -36,6 +36,7 @@ namespace gfx {
   _(OMTP, Feature, "Off Main Thread Painting")                           \
   _(WEBGPU, Feature, "WebGPU")                                           \
   _(X11_EGL, Feature, "X11 EGL")                                         \
+  _(DMABUF, Feature, "DMABUF")                                           \
   /* Add new entries above this comment */
 
 enum class Feature : uint32_t {

gfx/config/gfxVars.h

@@ -75,7 +75,8 @@ class gfxVarReceiver;
   _(UseAHardwareBufferContent, bool, false)                        \
   _(UseAHardwareBufferSharedSurface, bool, false)                  \
   _(UseEGL, bool, false)                                           \
-  _(DrmRenderDevice, nsCString, nsCString())
+  _(DrmRenderDevice, nsCString, nsCString())                       \
+  _(UseDMABuf, bool, false)
 
 /* Add new entries above this line. */
 

gfx/thebes/gfxPlatformGtk.cpp

@@ -60,7 +60,7 @@
 #  include <gdk/gdkwayland.h>
 #  include "mozilla/widget/nsWaylandDisplay.h"
 #  include "mozilla/widget/DMABufLibWrapper.h"
-#  include "mozilla/StaticPrefs_media.h"
+#  include "mozilla/StaticPrefs_widget.h"
 #endif
 
 #define GDK_PIXMAP_SIZE_MAX 32767
@@ -106,14 +106,13 @@ gfxPlatformGtk::gfxPlatformGtk() {
 #endif
 
     InitX11EGLConfig();
-
     if (IsWaylandDisplay() || gfxConfig::IsEnabled(Feature::X11_EGL)) {
       gfxVars::SetUseEGL(true);
+    }
 
-      nsCOMPtr<nsIGfxInfo> gfxInfo = components::GfxInfo::Service();
-      nsAutoCString drmRenderDevice;
-      gfxInfo->GetDrmRenderDevice(drmRenderDevice);
-      gfxVars::SetDrmRenderDevice(drmRenderDevice);
+    InitDmabufConfig();
+    if (gfxConfig::IsEnabled(Feature::DMABUF)) {
+      gfxVars::SetUseDMABuf(true);
     }
   }
 
@@ -121,7 +120,7 @@ gfxPlatformGtk::gfxPlatformGtk() {
 
 #ifdef MOZ_WAYLAND
   mUseWebGLDmabufBackend =
-      gfxVars::UseEGL() && GetDMABufDevice()->IsDMABufWebGLEnabled();
+      gfxVars::UseDMABuf() && GetDMABufDevice()->IsDMABufWebGLEnabled();
 #endif
 
   gPlatformFTLibrary = Factory::NewFTLibrary();
@@ -180,6 +179,49 @@ void gfxPlatformGtk::InitX11EGLConfig() {
 #endif
 }
 
+void gfxPlatformGtk::InitDmabufConfig() {
+  FeatureState& feature = gfxConfig::GetFeature(Feature::DMABUF);
+#ifdef MOZ_WAYLAND
+  feature.EnableByDefault();
+
+  if (StaticPrefs::widget_dmabuf_force_enabled_AtStartup()) {
+    feature.UserForceEnable("Force enabled by pref");
+  }
+
+  nsCString failureId;
+  int32_t status;
+  nsCOMPtr<nsIGfxInfo> gfxInfo = components::GfxInfo::Service();
+  if (NS_FAILED(gfxInfo->GetFeatureStatus(nsIGfxInfo::FEATURE_DMABUF, failureId,
+                                          &status))) {
+    feature.Disable(FeatureStatus::BlockedNoGfxInfo, "gfxInfo is broken",
+                    "FEATURE_FAILURE_NO_GFX_INFO"_ns);
+  } else if (status != nsIGfxInfo::FEATURE_STATUS_OK) {
+    feature.Disable(FeatureStatus::Blocklisted, "Blocklisted by gfxInfo",
+                    failureId);
+  }
+
+  if (!gfxVars::UseEGL()) {
+    feature.ForceDisable(FeatureStatus::Unavailable, "Requires EGL",
+                         "FEATURE_FAILURE_REQUIRES_EGL"_ns);
+  }
+
+  if (feature.IsEnabled()) {
+    nsAutoCString drmRenderDevice;
+    gfxInfo->GetDrmRenderDevice(drmRenderDevice);
+    gfxVars::SetDrmRenderDevice(drmRenderDevice);
+
+    if (!GetDMABufDevice()->Configure(failureId)) {
+      feature.ForceDisable(FeatureStatus::Failed, "Failed to configure",
+                           failureId);
+    }
+  }
+#else
+  feature.DisableByDefault(FeatureStatus::Unavailable,
+                           "Wayland support missing",
+                           "FEATURE_FAILURE_NO_WAYLAND"_ns);
+#endif
+}
+
 void gfxPlatformGtk::FlushContentDrawing() {
   if (gfxVars::UseXRender()) {
     XFlush(DefaultXDisplay());

gfx/thebes/gfxPlatformGtk.h

@@ -93,6 +93,7 @@ class gfxPlatformGtk final : public gfxPlatform {
 
  protected:
   void InitX11EGLConfig();
+  void InitDmabufConfig();
   void InitPlatformGPUProcessPrefs() override;
   bool CheckVariationFontSupport() override;
 

modules/libpref/init/StaticPrefList.yaml

@@ -10823,6 +10823,12 @@
   mirror: always
 
 #ifdef MOZ_WAYLAND
+# Whether to override the DMABuf blocklist.
+- name: widget.dmabuf.force-enabled
+  type: bool
+  value: false
+  mirror: once
+
 #ifdef NIGHTLY_BUILD
 # Keep those pref hidden on non-nightly builds to avoid people accidentally
 # turning it on.

widget/GfxInfoBase.cpp

@@ -234,6 +234,9 @@ static const char* GetPrefNameForFeature(int32_t aFeature) {
     case nsIGfxInfo::FEATURE_X11_EGL:
       name = BLOCKLIST_PREF_BRANCH "x11.egl";
       break;
+    case nsIGfxInfo::FEATURE_DMABUF:
+      name = BLOCKLIST_PREF_BRANCH "dmabuf";
+      break;
     default:
       MOZ_ASSERT_UNREACHABLE("Unexpected nsIGfxInfo feature?!");
       break;
@@ -432,6 +435,8 @@ static int32_t BlocklistFeatureToGfxFeature(const nsAString& aFeature) {
     return nsIGfxInfo::FEATURE_WEBRENDER_SOFTWARE;
   else if (aFeature.EqualsLiteral("X11_EGL"))
     return nsIGfxInfo::FEATURE_X11_EGL;
+  else if (aFeature.EqualsLiteral("DMABUF"))
+    return nsIGfxInfo::FEATURE_DMABUF;
 
   // If we don't recognize the feature, it may be new, and something
   // this version doesn't understand.  So, nothing to do.  This is
@@ -1294,6 +1299,7 @@ void GfxInfoBase::EvaluateDownloadedBlocklist(
                         nsIGfxInfo::FEATURE_GL_SWIZZLE,
                         nsIGfxInfo::FEATURE_ALLOW_WEBGL_OUT_OF_PROCESS,
                         nsIGfxInfo::FEATURE_X11_EGL,
+                        nsIGfxInfo::FEATURE_DMABUF,
                         0};
 
   // For every feature we know about, we evaluate whether this blocklist has a

widget/gtk/DMABufLibWrapper.cpp

@@ -168,7 +168,8 @@ nsDMABufDevice::nsDMABufDevice()
     : mXRGBFormat({true, false, GBM_FORMAT_XRGB8888, nullptr, 0}),
       mARGBFormat({true, true, GBM_FORMAT_ARGB8888, nullptr, 0}),
       mGbmDevice(nullptr),
-      mGbmFd(-1) {
+      mGbmFd(-1),
+      mInitialized(false) {
   if (GdkIsWaylandDisplay()) {
     wl_display* display = WaylandDisplayGetWLDisplay();
     mRegistry = (void*)wl_display_get_registry(display);
@@ -185,9 +186,12 @@ nsDMABufDevice::~nsDMABufDevice() {
   }
 }
 
-bool nsDMABufDevice::Configure() {
+bool nsDMABufDevice::Configure(nsACString& aFailureId) {
   LOGDMABUF(("nsDMABufDevice::Configure()"));
 
+  MOZ_ASSERT(!mInitialized);
+  mInitialized = true;
+
   bool isDMABufUsed = (
 #ifdef NIGHTLY_BUILD
       StaticPrefs::widget_dmabuf_textures_enabled() ||
@@ -199,11 +203,13 @@ bool nsDMABufDevice::Configure() {
   if (!isDMABufUsed) {
     // Disabled by user, just quit.
     LOGDMABUF(("IsDMABufEnabled(): Disabled by preferences."));
+    aFailureId = "FEATURE_FAILURE_NO_PREFS_ENABLED";
     return false;
   }
 
   if (!nsGbmLib::IsAvailable()) {
     LOGDMABUF(("nsGbmLib is not available!"));
+    aFailureId = "FEATURE_FAILURE_NO_LIBGBM";
     return false;
   }
 
@@ -212,6 +218,7 @@ bool nsDMABufDevice::Configure() {
     drm_render_node.Assign(gfx::gfxVars::DrmRenderDevice());
     if (drm_render_node.IsEmpty()) {
       LOGDMABUF(("Failed: We're missing DRM render device!\n"));
+      aFailureId = "FEATURE_FAILURE_NO_DRM_RENDER_NODE";
       return false;
     }
   }
@@ -219,6 +226,7 @@ bool nsDMABufDevice::Configure() {
   mGbmFd = open(drm_render_node.get(), O_RDWR);
   if (mGbmFd < 0) {
     LOGDMABUF(("Failed to open drm render node %s\n", drm_render_node.get()));
+    aFailureId = "FEATURE_FAILURE_BAD_DRM_RENDER_NODE";
     return false;
   }
 
@@ -226,6 +234,7 @@ bool nsDMABufDevice::Configure() {
   if (!mGbmDevice) {
     LOGDMABUF(
         ("Failed to create drm render device %s\n", drm_render_node.get()));
+    aFailureId = "FEATURE_FAILURE_NO_DRM_RENDER_DEVICE";
     close(mGbmFd);
     mGbmFd = -1;
     return false;
@@ -236,13 +245,17 @@ bool nsDMABufDevice::Configure() {
 }
 
 bool nsDMABufDevice::IsDMABufEnabled() {
-  static bool isDMABufEnabled = Configure();
-  return isDMABufEnabled;
+  if (!mInitialized) {
+    MOZ_ASSERT(!XRE_IsParentProcess());
+    nsCString failureId;
+    return Configure(failureId);
+  }
+  return !!mGbmDevice;
 }
 
 #ifdef NIGHTLY_BUILD
 bool nsDMABufDevice::IsDMABufTexturesEnabled() {
-  return gfx::gfxVars::UseEGL() && IsDMABufEnabled() &&
+  return gfx::gfxVars::UseDMABuf() && IsDMABufEnabled() &&
          StaticPrefs::widget_dmabuf_textures_enabled();
 }
 #else
@@ -257,7 +270,7 @@ bool nsDMABufDevice::IsDMABufVAAPIEnabled() {
        StaticPrefs::media_ffmpeg_vaapi_enabled(),
        gfx::gfxVars::CanUseHardwareVideoDecoding(), !XRE_IsRDDProcess()));
   return StaticPrefs::media_ffmpeg_vaapi_enabled() && !XRE_IsRDDProcess() &&
-         gfx::gfxVars::UseEGL() && IsDMABufEnabled() &&
+         gfx::gfxVars::UseDMABuf() && IsDMABufEnabled() &&
          gfx::gfxVars::CanUseHardwareVideoDecoding();
 }
 bool nsDMABufDevice::IsDMABufWebGLEnabled() {
@@ -266,7 +279,7 @@ bool nsDMABufDevice::IsDMABufWebGLEnabled() {
        "widget_dmabuf_webgl_enabled %d\n",
        gfx::gfxVars::UseEGL(), IsDMABufEnabled(),
        StaticPrefs::widget_dmabuf_webgl_enabled()));
-  return gfx::gfxVars::UseEGL() && IsDMABufEnabled() &&
+  return gfx::gfxVars::UseDMABuf() && IsDMABufEnabled() &&
          StaticPrefs::widget_dmabuf_webgl_enabled();
 }
 

widget/gtk/DMABufLibWrapper.h

@@ -150,10 +150,10 @@ class nsDMABufDevice {
   void ResetFormatsModifiers();
   void AddFormatModifier(bool aHasAlpha, int aFormat, uint32_t mModifierHi,
                          uint32_t mModifierLo);
+  bool Configure(nsACString& aFailureId);
 
  private:
   bool IsDMABufEnabled();
-  bool Configure();
 
   void* mRegistry;
 
@@ -162,6 +162,7 @@ class nsDMABufDevice {
 
   gbm_device* mGbmDevice;
   int mGbmFd;
+  bool mInitialized;
 };
 
 nsDMABufDevice* GetDMABufDevice();

widget/nsIGfxInfo.idl

@@ -175,8 +175,10 @@ interface nsIGfxInfo : nsISupports
   const long FEATURE_WEBRENDER_OPTIMIZED_SHADERS = 33;
   /* Whether we prefer EGL over GLX with X11, starting in 88. */
   const long FEATURE_X11_EGL = 34;
+  /* Whether DMABUF is supported, starting in 88. */
+  const long FEATURE_DMABUF = 35;
   /* the maximum feature value. */
-  const long FEATURE_MAX_VALUE = FEATURE_X11_EGL;
+  const long FEATURE_MAX_VALUE = FEATURE_DMABUF;
 
   /*
    * A set of return values from GetFeatureStatus