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venus: properly handle wsi implicit in-fence

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Vulkan is supposed to operate in explicit synchronization mode. However,
for legacy compositors that only support implicit fencing, we have to
extract the compositor implicit fence (release fence) and resolve it
properly.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39401>
This commit is contained in:
Yiwei Zhang 2026-01-18 23:55:33 -08:00 • committed by Marge Bot
parent 211c21725c
commit 849e3552e8
1 changed files with 18 additions and 1 deletions
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19
src/virtio/vulkan/vn_wsi.c
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@ -853,8 +853,25 @@ vn_AcquireNextImage2KHR(VkDevice device,
if (result != VK_SUCCESS && result != VK_SUBOPTIMAL_KHR)
return vn_error(dev->instance, result);
/* XXX this relies on renderer side doing implicit fencing */
int sync_fd = -1;
if (!dev->renderer->info.has_implicit_fencing) {
VkDeviceMemory mem_handle =
wsi_common_get_memory(pAcquireInfo->swapchain, *pImageIndex);
struct vn_device_memory *mem = vn_device_memory_from_handle(mem_handle);
struct vn_image *img = mem->dedicated_img;
if (img->wsi.is_prime_blit_src)
mem = img->wsi.blit_mem;
/* Only image buffer blit is tracked (both cpu and prime), so we use if
* condition below for potential new blit path supported on non-Linux
* platforms.
*/
if (mem) {
sync_fd =
vn_renderer_bo_export_sync_file(dev->renderer, mem->base_bo);
}
}
int sem_fd = -1, fence_fd = -1;
if (sync_fd >= 0) {