[Beignet] [PATCH v2 4/4] HSW: Restore L3 control register to disable SLM mode.

[Yang Rong]

It seems L3 control register is per context in IVB, but not per context
in HSW, so need restore the L3 control register, otherwise, it may cause screen flick.
this patch may hurt some performance.

Signed-off-by: Yang Rong <rong.r.yang at intel.com>
---
 src/intel/intel_gpgpu.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/src/intel/intel_gpgpu.c b/src/intel/intel_gpgpu.c
index 20b832a..a1bd672 100644
--- a/src/intel/intel_gpgpu.c
+++ b/src/intel/intel_gpgpu.c
@@ -124,6 +124,9 @@ intel_gpgpu_set_L3_t *intel_gpgpu_set_L3 = NULL;
 typedef uint32_t (intel_gpgpu_get_scratch_index_t)(uint32_t size);
 intel_gpgpu_get_scratch_index_t *intel_gpgpu_get_scratch_index = NULL;
 
+typedef void (intel_gpgpu_post_action_t)(intel_gpgpu_t *gpgpu, int32_t flush_mode);
+intel_gpgpu_post_action_t *intel_gpgpu_post_action = NULL;
+
 static void
 intel_gpgpu_sync(void *buf)
 {
@@ -480,6 +483,24 @@ intel_gpgpu_batch_start(intel_gpgpu_t *gpgpu)
 }
 
 static void
+intel_gpgpu_post_action_gen7(intel_gpgpu_t *gpgpu, int32_t flush_mode)
+{
+  if(flush_mode)
+    intel_gpgpu_pipe_control(gpgpu);
+}
+
+static void
+intel_gpgpu_post_action_gen75(intel_gpgpu_t *gpgpu, int32_t flush_mode)
+{
+  /* flush force for set L3 */
+  intel_gpgpu_pipe_control(gpgpu);
+
+  /* Restore L3 control to disable SLM mode,
+     otherwise, may affect 3D pipeline */
+  intel_gpgpu_set_L3(gpgpu, 0);
+}
+
+static void
 intel_gpgpu_batch_end(intel_gpgpu_t *gpgpu, int32_t flush_mode)
 {
   /* Insert PIPE_CONTROL for time stamp of end*/
@@ -501,7 +522,7 @@ intel_gpgpu_batch_end(intel_gpgpu_t *gpgpu, int32_t flush_mode)
     ADVANCE_BATCH(gpgpu->batch);
   }
 
-  if(flush_mode) intel_gpgpu_pipe_control(gpgpu);
+  intel_gpgpu_post_action(gpgpu, flush_mode);
   intel_batchbuffer_end_atomic(gpgpu->batch);
 }
 
@@ -1224,6 +1245,7 @@ intel_set_gpgpu_callbacks(int device_id)
     intel_gpgpu_set_L3 = intel_gpgpu_set_L3_gen75;
     cl_gpgpu_get_cache_ctrl = (cl_gpgpu_get_cache_ctrl_cb *)intel_gpgpu_get_cache_ctrl_gen75;
     intel_gpgpu_get_scratch_index = intel_gpgpu_get_scratch_index_gen75;
+    intel_gpgpu_post_action = intel_gpgpu_post_action_gen75;
   }
   else if (IS_IVYBRIDGE(device_id)) {
     cl_gpgpu_bind_image = (cl_gpgpu_bind_image_cb *) intel_gpgpu_bind_image_gen7;
@@ -1233,6 +1255,7 @@ intel_set_gpgpu_callbacks(int device_id)
       intel_gpgpu_set_L3 = intel_gpgpu_set_L3_gen7;
     cl_gpgpu_get_cache_ctrl = (cl_gpgpu_get_cache_ctrl_cb *)intel_gpgpu_get_cache_ctrl_gen7;
     intel_gpgpu_get_scratch_index = intel_gpgpu_get_scratch_index_gen7;
+    intel_gpgpu_post_action = intel_gpgpu_post_action_gen7;
   }
   else
     assert(0);
-- 
1.8.3.2