[Mesa-dev] [PATCH 1/4] i965/blorp: Do pre-draw flush with two pipe-control writes

[Topi Pohjolainen]

by replacing brw_emit_mi_flush() with brw_render_cache_set_check_flush().
The latter splits the flush in two:

   brw_emit_pipe_control_flush(brw,
                               PIPE_CONTROL_DEPTH_CACHE_FLUSH |
                               PIPE_CONTROL_RENDER_TARGET_FLUSH |
                               PIPE_CONTROL_CS_STALL);

   brw_emit_pipe_control_flush(brw,
                               PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE |
                               PIPE_CONTROL_CONST_CACHE_INVALIDATE);

instead of

   int flags = PIPE_CONTROL_NO_WRITE | PIPE_CONTROL_RENDER_TARGET_FLUSH;
   if (brw->gen >= 6) {
      flags |= PIPE_CONTROL_INSTRUCTION_INVALIDATE |
               PIPE_CONTROL_CONST_CACHE_INVALIDATE |
               PIPE_CONTROL_DEPTH_CACHE_FLUSH |
               PIPE_CONTROL_VF_CACHE_INVALIDATE |
               PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE |
               PIPE_CONTROL_CS_STALL;
   }
   brw_emit_pipe_control_flush(brw, flags);

Signed-off-by: Topi Pohjolainen <topi.pohjolainen at intel.com>
---
 src/mesa/drivers/dri/i965/genX_blorp_exec.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/mesa/drivers/dri/i965/genX_blorp_exec.c b/src/mesa/drivers/dri/i965/genX_blorp_exec.c
index bb1dfa9..c0cbde5 100644
--- a/src/mesa/drivers/dri/i965/genX_blorp_exec.c
+++ b/src/mesa/drivers/dri/i965/genX_blorp_exec.c
@@ -25,6 +25,7 @@
 
 #include "intel_batchbuffer.h"
 #include "intel_mipmap_tree.h"
+#include "intel_fbo.h"
 
 #include "brw_context.h"
 #include "brw_state.h"
@@ -179,7 +180,9 @@ genX(blorp_exec)(struct blorp_batch *batch,
     * data with different formats, which blorp does for stencil and depth
     * data.
     */
-   brw_emit_mi_flush(brw);
+   if (params->src.enabled)
+      brw_render_cache_set_check_flush(brw, params->src.addr.buffer);
+   brw_render_cache_set_check_flush(brw, params->dst.addr.buffer);
 
    brw_select_pipeline(brw, BRW_RENDER_PIPELINE);
 
@@ -256,6 +259,8 @@ retry:
    brw->no_depth_or_stencil = false;
    brw->ib.type = -1;
 
+   brw_render_cache_set_add_bo(brw, params->dst.addr.buffer);
+
    /* Flush the sampler cache so any texturing from the destination is
     * coherent.
     */
-- 
2.5.5