[PATCH 6.18 107/752] drm/xe/vm: Skip ufence association for CPU address mirror VMA during MAP

Sasha Levin
2026-02-28T17:49:38Z

From: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>

[ Upstream commit 7f08cc5b3cc3bf6416f8b55bff906f67ed75637d ]

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>
---
drivers/gpu/drm/xe/xe_vm.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index 2444800d0fd35..59ff911f8aad0 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/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)
--
2.51.0