From e2d7418c1d4428ea4f7c3f5e3e2b7a2b0a0790a5 Mon Sep 17 00:00:00 2001
From: Carlos Garcia Campos <cgarcia@igalia.com>
Date: Wed, 30 Oct 2024 14:39:03 +0100
Subject: [PATCH] Disable DMABuf renderer for NVIDIA proprietary drivers

Bug: https://bugs.webkit.org/show_bug.cgi?id=262607
Bug-Debian: https://bugs.debian.org/1039720
Origin: https://github.com/WebKit/WebKit/pull/18614

===================================================================

Gbp-Pq: Name disable-nvidia-dmabuf.patch
---
 .../gtk/AcceleratedBackingStoreDMABuf.cpp     | 32 +++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/Source/WebKit/UIProcess/gtk/AcceleratedBackingStoreDMABuf.cpp b/Source/WebKit/UIProcess/gtk/AcceleratedBackingStoreDMABuf.cpp
index 95f8f8a3cc..965e16a4e3 100644
--- a/Source/WebKit/UIProcess/gtk/AcceleratedBackingStoreDMABuf.cpp
+++ b/Source/WebKit/UIProcess/gtk/AcceleratedBackingStoreDMABuf.cpp
@@ -38,6 +38,7 @@
 #include <WebCore/IntRect.h>
 #include <WebCore/NotImplemented.h>
 #include <WebCore/PlatformDisplay.h>
+#include <WebCore/PlatformDisplaySurfaceless.h>
 #include <WebCore/ShareableBitmap.h>
 #include <WebCore/SharedMemory.h>
 #include <epoxy/egl.h>
@@ -51,6 +52,7 @@
 
 #if USE(GBM)
 #include <WebCore/DRMDeviceManager.h>
+#include <WebCore/PlatformDisplayGBM.h>
 #include <gbm.h>
 
 static constexpr uint64_t s_dmabufInvalidModifier = DRM_FORMAT_MOD_INVALID;
@@ -66,6 +68,33 @@ namespace WebKit {
 
 WTF_MAKE_TZONE_ALLOCATED_IMPL(AcceleratedBackingStoreDMABuf);
 
+static bool isNVIDIA()
+{
+    const char* forceDMABuf = getenv("WEBKIT_FORCE_DMABUF_RENDERER");
+    if (forceDMABuf && strcmp(forceDMABuf, "0"))
+        return false;
+
+    std::unique_ptr<WebCore::PlatformDisplay> platformDisplay;
+#if USE(GBM)
+    const char* disableGBM = getenv("WEBKIT_DMABUF_RENDERER_DISABLE_GBM");
+    if (!disableGBM || !strcmp(disableGBM, "0")) {
+
+        auto& manager = WebCore::DRMDeviceManager::singleton();
+        if (!manager.isInitialized())
+            manager.initializeMainDevice(drmRenderNodeDevice());
+        if (auto* device = manager.mainGBMDeviceNode(WebCore::DRMDeviceManager::NodeType::Render))
+            platformDisplay = WebCore::PlatformDisplayGBM::create(device);
+    }
+#endif
+    if (!platformDisplay)
+        platformDisplay = WebCore::PlatformDisplaySurfaceless::create();
+
+    WebCore::GLContext::ScopedGLContext glContext(WebCore::GLContext::createOffscreen(platformDisplay ? *platformDisplay : WebCore::PlatformDisplay::sharedDisplay()));
+    if (strstr(reinterpret_cast<const char*>(glGetString(GL_VENDOR)), "NVIDIA"))
+        return true;
+    return false;
+}
+
 OptionSet<DMABufRendererBufferMode> AcceleratedBackingStoreDMABuf::rendererBufferMode()
 {
     static OptionSet<DMABufRendererBufferMode> mode;
@@ -81,6 +110,9 @@ OptionSet<DMABufRendererBufferMode> AcceleratedBackingStoreDMABuf::rendererBuffe
             return;
         }
 
+        if (isNVIDIA())
+            return;
+
         mode.add(DMABufRendererBufferMode::SharedMemory);
 
         const char* forceSHM = getenv("WEBKIT_DMABUF_RENDERER_FORCE_SHM");
-- 
2.30.2