drm/xe/vm: Skip ufence association for CPU address mirror VMA during MAP

[ Upstream commit 7f08cc5 ]

The MAP operation for a CPU address mirror VMA does not require ufence
association because such mappings are not GPU-synchronized and do not
participate in GPU job completion signaling.

Remove the unnecessary ufence addition for this case to avoid -EBUSY
failure in check_ufence of unbind ops.

Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20251125075628.1182481-6-himal.prasad.ghimiray@intel.com
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: hghimira

drivers/gpu/drm/xe/xe_vm.c

@@ -3179,7 +3179,8 @@ static void op_add_ufence(struct xe_vm *vm, struct xe_vma_op *op,
 {
 	switch (op->base.op) {
 	case DRM_GPUVA_OP_MAP:
-		vma_add_ufence(op->map.vma, ufence);
+		if (!xe_vma_is_cpu_addr_mirror(op->map.vma))
+			vma_add_ufence(op->map.vma, ufence);
 		break;
 	case DRM_GPUVA_OP_REMAP:
 		if (op->remap.prev)