i965: Track last location of bo used for the batch

[mesa.git] / src / mesa / drivers / dri / i965 / brw_bufmgr.h

diff --git a/src/mesa/drivers/dri/i965/brw_bufmgr.h b/src/mesa/drivers/dri/i965/brw_bufmgr.h
index 6a6051bb71ca1488d4833cac0347bd83391e166a..d09bc74c9c258bc0ed688bf77842000f4ee095c1 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_bufmgr.h
+++ b/src/mesa/drivers/dri/i965/brw_bufmgr.h
@@ -37,6 +37,7 @@
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>
+#include "util/u_atomic.h"
 #include "util/list.h"
 
 #if defined(__cplusplus)
@@ -75,6 +76,16 @@ struct brw_bo {
     */
    uint64_t offset64;
 
+   /**
+    * The validation list index for this buffer, or -1 when not in a batch.
+    * Note that a single buffer may be in multiple batches (contexts), and
+    * this is a global field, which refers to the last batch using the BO.
+    * It should not be considered authoritative, but can be used to avoid a
+    * linear walk of the validation list in the common case by guessing that
+    * exec_bos[bo->index] == bo and confirming whether that's the case.
+    */
+   unsigned index;
+
    /**
     * Boolean of whether the GPU is definitely not accessing the buffer.
     *
@@ -188,7 +199,11 @@ struct brw_bo *brw_bo_alloc_tiled_2d(struct brw_bufmgr *bufmgr,
                                      unsigned flags);
 
 /** Takes a reference on a buffer object */
-void brw_bo_reference(struct brw_bo *bo);
+static inline void
+brw_bo_reference(struct brw_bo *bo)
+{
+   p_atomic_inc(&bo->refcount);
+}
 
 /**
  * Releases a reference on a buffer object, freeing the data if