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backend/native: Find render node directly via udev

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Don't try to find the card, and then the render node from it, just ask
udev to list the render nodes directly. This avoids running into
permission errors when the user cannot open /dev/dri/card* even without
mode setting capabilities.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3805>
This commit is contained in:
Jonas Ådahl
2024-06-12 10:54:59 +02:00
committed by Marge Bot
parent 014ea91a9d
commit 6bd2fd6a74
5 changed files with 44 additions and 42 deletions
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46
src/backends/native/meta-backend-native.c
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@ -418,38 +418,6 @@ create_render_device (MetaBackendNative *backend_native,
if (!device_file)
return NULL;
if (meta_backend_is_headless (backend))
{
int fd;
g_autofree char *render_node_path = NULL;
g_autoptr (MetaDeviceFile) render_node_device_file = NULL;
fd = meta_device_file_get_fd (device_file);
render_node_path = drmGetRenderDeviceNameFromFd (fd);
if (!render_node_path)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Couldn't find render node device for '%s'",
meta_device_file_get_path (device_file));
return NULL;
}
meta_topic (META_DEBUG_KMS, "Found render node '%s' from '%s'",
render_node_path,
meta_device_file_get_path (device_file));
render_node_device_file =
meta_device_pool_open (device_pool, render_node_path,
META_DEVICE_FILE_FLAG_NONE,
error);
if (!render_node_device_file)
return NULL;
g_clear_pointer (&device_file, meta_device_file_release);
device_file = g_steal_pointer (&render_node_device_file);
}
#ifdef HAVE_EGL_DEVICE
if (g_strcmp0 (getenv ("MUTTER_DEBUG_FORCE_EGL_STREAM"), "1") != 0)
#endif
@ -642,10 +610,22 @@ init_gpus (MetaBackendNative *native,
MetaBackend *backend = META_BACKEND (native);
MetaUdev *udev = meta_backend_native_get_udev (native);
g_autoptr (GError) local_error = NULL;
MetaUdevDeviceType device_type = 0;
GList *devices;
GList *l;
devices = meta_udev_list_drm_devices (udev, &local_error);
switch (native->mode)
{
case META_BACKEND_NATIVE_MODE_DEFAULT:
case META_BACKEND_NATIVE_MODE_TEST:
device_type = META_UDEV_DEVICE_TYPE_CARD;
break;
case META_BACKEND_NATIVE_MODE_HEADLESS:
device_type = META_UDEV_DEVICE_TYPE_RENDER_NODE;
break;
}
devices = meta_udev_list_drm_devices (udev, device_type, &local_error);
if (local_error)
{
g_propagate_error (error, g_steal_pointer (&local_error));