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venus: force prime blit on Nvidia GPU

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Normally Venus on Nvidia GPUs takes the prime blit path. The exception
is when KWin or any wlroots based compositors are used:
1. KWin and wlroots based compositors always add LINEAR to dmabuf
   feedback tranches assuming LINEAR can be handled by GPU drivers.
2. Venus + Virgl only sees the compositor injected LINEAR mod since
   Virgl doesn't support explicit modifiers on the driver side.
3. Nvidia GPUs doesn't support LINEAR color attachment, and it's too
   late to reject LINEAR mod when the native image path has already
   been taken instead of the prime image path.

Gamescope requires VK_EXT_physical_device_drm and its runtime doesn't
use standard WSI extensions, so venus can spoof without impacting it.

Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40339>
This commit is contained in:
Yiwei Zhang 2026-03-11 02:14:35 -07:00 • committed by Marge Bot
parent 291ff330a4
commit 1a302155ee
1 changed files with 36 additions and 0 deletions
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36
src/virtio/vulkan/vn_wsi.c
View file

@ -138,6 +138,42 @@ vn_wsi_init(struct vn_physical_device *physical_dev)
physical_dev->renderer_driver_version <
VN_MAKE_NVIDIA_VERSION(590, 48, 1, 0));
/* Normally Venus on Nvidia GPUs takes the prime blit path. The exception
* is when KWin or any wlroots based compositors are used:
* 1. KWin and wlroots based compositors always add LINEAR to dmabuf
* feedback tranches assuming LINEAR can be handled by GPU drivers.
* 2. Venus + Virgl only sees the compositor injected LINEAR mod since
* Virgl doesn't support explicit modifiers on the driver side.
* 3. Nvidia GPUs doesn't support LINEAR color attachment, and it's too
* late to reject LINEAR mod when the native image path has already
* been taken instead of the prime image path.
*
* Gamescope requires VK_EXT_physical_device_drm and its runtime doesn't
* use standard WSI extensions, so venus can spoof without impacting it.
*/
struct vk_properties *props = &physical_dev->base.vk.properties;
const bool is_nvidia = props->vendorID == 0x10de;
const char *app_name = physical_dev->instance->base.vk.app_info.app_name;
const bool is_gamescope = app_name && strcmp(app_name, "gamescope") == 0;
if (is_nvidia && !is_gamescope) {
/* Fail same_gpu check on x11. See wsi_device_matches_drm_fd. */
physical_dev->base.vk.supported_extensions.EXT_pci_bus_info = false;
props->pciDomain = 0;
props->pciBus = 0;
props->pciDevice = 0;
props->pciFunction = 0;
/* Fail same_gpu check on wayland. See wsi_wl_display_init. */
physical_dev->base.vk.supported_extensions.EXT_physical_device_drm =
false;
props->drmHasPrimary = false;
props->drmHasRender = true;
props->drmPrimaryMajor = 0;
props->drmPrimaryMinor = 0;
props->drmRenderMajor = 0;
props->drmRenderMinor = 0;
}
const VkAllocationCallbacks *alloc =
&physical_dev->instance->base.vk.alloc;
VkResult result = wsi_device_init(