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Looks possible to switch from CPU binding to GPU binding mid exec, and if that happens for the same dma-resv we might use two fence slots, once for the dummy fence, and another for the actual GPU bind. References: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/698 Signed-off-by: Matthew Auld <matthew.auld@intel.com> Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com> Cc: Matthew Brost <matthew.brost@intel.com> Reviewed-by: José Roberto de Souza <jose.souza@intel.com>