sna: Pass inplace hint for sna_copy_boxes fallback

In the unlikely event that this makes a difference, provide the hint as
to when we do not read back from the destination and so a streaming copy
would be preferable.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 4 insertions, 3 deletions

diff --git a/src/sna/sna_accel.c b/src/sna/sna_accel.c
index 37385ebe..1e9ee166 100644
--- a/src/sna/sna_accel.c
+++ b/src/sna/sna_accel.c
@@ -3283,9 +3283,10 @@ fallback:
 			assert_pixmap_contains_box(dst_pixmap,
 						   RegionExtents(&region));
 
-			mode = MOVE_WRITE;
-			if (alu != GXcopy)
-				mode |= MOVE_READ;
+			if (alu_overwrites(alu))
+				mode = MOVE_WRITE | MOVE_INPLACE_HINT;
+			else
+				mode = MOVE_WRITE | MOVE_READ;
 			if (!sna_drawable_move_region_to_cpu(&dst_pixmap->drawable,
 							     &region, mode))
 				goto out;