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virtio: Add USE_CURSOR buffer padding

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This change modifies buffer allocation to include necessary padding
for buffers with the BO_USE_CURSOR flag. This behavior mirrors
identical logic in the i915, xe, and mtk implementations.

Bug: b/426503691
Change-Id: Ic572a970dcde0606fa9ec5844c57d3136c5d0b84
(cherry picked from commit f13b0faac8501a3bf3eb90f2fd07107728576876)
This commit is contained in:
Andrew Wolfers 2025-06-23 17:00:47 +00:00
parent 035900982f
commit 34fcb9cbe2
1 changed files with 22 additions and 0 deletions
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22
virtgpu_virgl.c
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@ -421,6 +421,28 @@ static void virgl_add_combinations(struct driver *drv, const uint32_t *drm_forma
static int virgl_2d_dumb_bo_create(struct bo *bo, uint32_t width, uint32_t height, uint32_t format,
uint64_t use_flags)
{
/*
* For cursor buffer, add padding as needed to reach a known cursor-plane-supported
* buffer size, as reported by the cursor capability properties.
*
* If the requested dimensions exceed either of the reported capabilities, or if the
* capabilities couldn't be read, silently fallback by continuing without additional
* padding. The buffer can still be used normally, and be committed to non-cursor
* planes.
*/
if (bo->meta.use_flags & BO_USE_CURSOR) {
uint64_t cursor_width = 0;
uint64_t cursor_height = 0;
// These values are not properly set in virtio, and will return the default dimensions of 64x64.
bool err = drmGetCap(bo->drv->fd, DRM_CAP_CURSOR_WIDTH, &cursor_width) ||
drmGetCap(bo->drv->fd, DRM_CAP_CURSOR_HEIGHT, &cursor_height);
if (!err && width <= cursor_width && height <= cursor_height) {
width = cursor_width;
height = cursor_height;
}
}
if (bo->meta.format != DRM_FORMAT_R8) {
width = ALIGN(width, MESA_LLVMPIPE_TILE_SIZE);
height = ALIGN(height, MESA_LLVMPIPE_TILE_SIZE);