[Mesa-dev] [PATCH 4/5] intel/isl: Assert that we don't use CCS for storage images

[Jason Ekstrand]

I enabled CCS for storage images in the Vulkan driver and ran it through
the CTS.  It didn't result in any hangs but it demonstrated that the data
port cannot handle CCS.
---
 src/intel/isl/isl_surface_state.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/intel/isl/isl_surface_state.c b/src/intel/isl/isl_surface_state.c
index c7b220b..29ec289 100644
--- a/src/intel/isl/isl_surface_state.c
+++ b/src/intel/isl/isl_surface_state.c
@@ -537,6 +537,12 @@ isl_genX(surf_fill_state_s)(const struct isl_device *dev, void *state,
 
 #if GEN_GEN >= 7
    if (info->aux_surf && info->aux_usage != ISL_AUX_USAGE_NONE) {
+      /* The docs don't appear to say anything whatsoever about compression
+       * and the data port.  Testing seems to indicate that the data port
+       * completely ignores the AuxiliarySurfaceMode field.
+       */
+      assert(!(info->view->usage & ISL_SURF_USAGE_STORAGE_BIT));
+
       struct isl_tile_info tile_info;
       isl_surf_get_tile_info(dev, info->aux_surf, &tile_info);
       uint32_t pitch_in_tiles =
-- 
2.5.0.400.gff86faf