[Intel-xe] [PATCH 3/4] drm/gpuva: Add drm_gpuva_for_each_op_reverse

[Matthew Brost]

Xe will make use of this, add helper to walk op list in reverse when
unwinding GPUVA operations.

Signed-off-by: Matthew Brost <matthew.brost at intel.com>
---
 include/drm/drm_gpuva_mgr.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/drm/drm_gpuva_mgr.h b/include/drm/drm_gpuva_mgr.h
index ed8d50200cc3..b2024ae19fd4 100644
--- a/include/drm/drm_gpuva_mgr.h
+++ b/include/drm/drm_gpuva_mgr.h
@@ -557,6 +557,16 @@ struct drm_gpuva_ops {
 #define drm_gpuva_for_each_op_from_reverse(op, ops) \
 	list_for_each_entry_from_reverse(op, &(ops)->list, entry)
 
+/**
+ * drm_gpuva_for_each_op_reverse - iterator to walk over &drm_gpuva_ops in reverse
+ * @op: &drm_gpuva_op to assign in each iteration step
+ * @ops: &drm_gpuva_ops to walk
+ *
+ * This iterator walks over all ops within a given list of operations in reverse
+ */
+#define drm_gpuva_for_each_op_reverse(op, ops) \
+	list_for_each_entry_reverse(op, &(ops)->list, entry)
+
 /**
  * drm_gpuva_first_op() - returns the first &drm_gpuva_op from &drm_gpuva_ops
  * @ops: the &drm_gpuva_ops to get the fist &drm_gpuva_op from
-- 
2.34.1