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drm/vmwgfx: Update last_read_seqno under the fence lock

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There was a possible race in vmw_update_seqno. Because of this race it
was possible for last_read_seqno to go backwards. Remove this function
and replace it with vmw_update_fences which now sets and returns the
last_read_seqno while holding the fence lock. This serialization via the
fence lock ensures that last_read_seqno is monotonic again.

Signed-off-by: Ian Forbes <ian.forbes@broadcom.com>
Signed-off-by: Zack Rusin <zack.rusin@broadcom.com>
Link: https://lore.kernel.org/r/20250530183510.733175-1-ian.forbes@broadcom.com
This commit is contained in:
Ian Forbes
2025-05-30 13:35:08 -05:00
committed by Zack Rusin
parent a72002cb18
commit c82f55f4aa
7 changed files with 22 additions and 31 deletions
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2
drivers/gpu/drm/vmwgfx/vmwgfx_cmd.c
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@@ -544,7 +544,7 @@ int vmw_cmd_send_fence(struct vmw_private *dev_priv, uint32_t *seqno)
cmd_fence = (struct svga_fifo_cmd_fence *) fm;
cmd_fence->fence = *seqno;
vmw_cmd_commit_flush(dev_priv, bytes);
vmw_update_seqno(dev_priv);
vmw_fences_update(dev_priv->fman);
out_err:
return ret;