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drm/vmwgfx: Fix mob cursor allocation race

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Writes to SVGA_REG_CURSOR_MOBID did not wait for the buffers to be fully
populated. This sometimes results in the device not being aware of
the buffer when the cursor mob register was written.
Properly wait for the buffer to be fully populated before setting it
as a cursor mob.

Signed-off-by: Zack Rusin <zackr@vmware.com>
Fixes: 485d98d472 ("drm/vmwgfx: Add support for CursorMob and CursorBypass 4")
Reviewed-by: Martin Krastev <krastevm@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220318174332.440068-3-zack@kde.org
This commit is contained in:
Zack Rusin 2022-03-18 13:43:29 -04:00
parent 10a26e0d5f
commit ab709795e3
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
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@ -602,6 +602,14 @@ vmw_du_cursor_plane_prepare_fb(struct drm_plane *plane,
ret = ttm_bo_kmap(cm_bo, 0, PFN_UP(size), &vps->cm_map);
/*
* We just want to try to get mob bind to finish
* so that the first write to SVGA_REG_CURSOR_MOBID
* is done with a buffer that the device has already
* seen
*/
(void) ttm_bo_wait(cm_bo, false, false);
ttm_bo_unreserve(cm_bo);
if (unlikely(ret != 0)) {