anv: Apply flush during WriteAccelerationStructures

We are reading accel header parameter those are updated by CS, so we
need to apply flushes to make L3 coherent with CS.

This fixes ray query tests on MTL:
- dEQP-VK.ray_query.*.serialization.*

Cc: mesa-stable

Signed-off-by: Sagar Ghuge <sagar.ghuge@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35590>

src/intel/vulkan/genX_query.c

@@ -2066,10 +2066,17 @@ genX(CmdWriteAccelerationStructuresPropertiesKHR)(
    ANV_FROM_HANDLE(anv_cmd_buffer, cmd_buffer, commandBuffer);
    ANV_FROM_HANDLE(anv_query_pool, pool, queryPool);
 
-   anv_add_pending_pipe_bits(cmd_buffer,
-                             ANV_PIPE_END_OF_PIPE_SYNC_BIT |
-                             ANV_PIPE_DATA_CACHE_FLUSH_BIT,
-                             "read BVH data using CS");
+   /* L1/L2 caches flushes should have been dealt with by pipeline barriers.
+    * Unfortunately some platforms require L3 flush because CS (reading the
+    * dispatch parameters) is not L3 coherent.
+    */
+   if (!ANV_DEVINFO_HAS_COHERENT_L3_CS(cmd_buffer->device->info)) {
+      anv_add_pending_pipe_bits(cmd_buffer,
+                                ANV_PIPE_END_OF_PIPE_SYNC_BIT |
+                                ANV_PIPE_DATA_CACHE_FLUSH_BIT,
+                                "read BVH data using CS");
+      genX(cmd_buffer_apply_pipe_flushes)(cmd_buffer);
+   }
 
    if (append_query_clear_flush(
           cmd_buffer, pool,