iris/bufmgr: Add iris_pat_index_for_bo_flags()

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Suggested-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22878>

src/gallium/drivers/iris/iris_bufmgr.h

@@ -539,6 +539,22 @@ iris_bo_bump_seqno(struct iris_bo *bo, uint64_t seqno,
       prev_seqno = tmp;
 }
 
+/**
+ * Return the pat index based on the bo allocation flags.
+ */
+static inline uint32_t
+iris_pat_index_for_bo_flags(const struct intel_device_info *devinfo,
+                            unsigned alloc_flags)
+{
+   if (alloc_flags & BO_ALLOC_COHERENT)
+      return devinfo->pat.coherent;
+
+   if (alloc_flags & (BO_ALLOC_SHARED | BO_ALLOC_SCANOUT))
+      return devinfo->pat.scanout;
+
+   return devinfo->pat.writeback;
+}
+
 enum iris_memory_zone iris_memzone_for_address(uint64_t address);
 
 int iris_bufmgr_create_screen_id(struct iris_bufmgr *bufmgr);