freedreno/a5xx: fix page faults on last level

We could alternatively fall back to using "old style" draw's for
mem<->gmem (ie. what <= a4xx do) when height is not aligned to 32,
but that is somewhat more work (and not really something that could
be applied to stable)

Cc: "18.0" <mesa-stable@lists.freedesktop.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

src/gallium/drivers/freedreno/a5xx/fd5_resource.c

@@ -73,6 +73,16 @@ setup_slices(struct fd_resource *rsc, uint32_t alignment, enum pipe_format forma
 			aligned_height = align(aligned_height, heightalign);
 		} else {
 			pitchalign = 64;
+
+			/* The blits used for mem<->gmem work at a granularity of
+			 * 32x32, which can cause faults due to over-fetch on the
+			 * last level.  The simple solution is to over-allocate a
+			 * bit the last level to ensure any over-fetch is harmless.
+			 * The pitch is already sufficiently aligned, but height
+			 * may not be:
+			 */
+			if (level == prsc->last_level)
+				aligned_height = align(aligned_height, 32);
 		}
 
 		if (layout == UTIL_FORMAT_LAYOUT_ASTC)