[PATCH v4 3/3] drm/xe: Skip adding PRL entry to NULL VMA

[Brian Nguyen <brian3.nguyen@intel.com>]

NULL VMAs have no corresponding PTE, so skip adding a PRL entry to avoid
an unnecessary PRL abort during unbind.

Signed-off-by: Brian Nguyen <brian3.nguyen@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
---
 drivers/gpu/drm/xe/xe_page_reclaim.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_page_reclaim.c b/drivers/gpu/drm/xe/xe_page_reclaim.c
index 60b0fda59ce3..da1ed99cd3f8 100644
--- a/drivers/gpu/drm/xe/xe_page_reclaim.c
+++ b/drivers/gpu/drm/xe/xe_page_reclaim.c
@@ -27,12 +27,18 @@
  * flushes.
  * - pat_index is transient display (1)
  *
+ * For cases of NULL VMA, there should be no corresponding PRL entry
+ * so skip over.
+ *
  * Return: true when page reclamation is unnecessary, false otherwise.
  */
 bool xe_page_reclaim_skip(struct xe_tile *tile, struct xe_vma *vma)
 {
 	u8 l3_policy;
 
+	if (xe_vma_is_null(vma))
+		return true;
+
 	l3_policy = xe_pat_index_get_l3_policy(tile->xe, vma->attr.pat_index);
 
 	/*
-- 
2.43.0