Mesa (master): i965: Implement brw_bo_map_unsynchronized() with MAP_ASYNC

[Matt Turner]

Module: Mesa
Branch: master
Commit: ce17d4c5f5489e88554a8ef59f8cc6e453953336
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=ce17d4c5f5489e88554a8ef59f8cc6e453953336

Author: Matt Turner <mattst88 at gmail.com>
Date:   Wed May 31 21:12:01 2017 -0700

i965: Implement brw_bo_map_unsynchronized() with MAP_ASYNC

This way we can let brw_bo_map() choose the best mapping type.

Part of the patch inlines map_gtt() into brw_bo_map_gtt() (and removes
map_gtt()). brw_bo_map_gtt() just wrapped map_gtt() with locking and a
call to set_domain(). map_gtt() is called by brw_bo_map_unsynchronized()
to avoid the call to set_domain(). With the MAP_ASYNC flag, we now have
the same behavior previously provided by brw_bo_map_unsynchronized().

Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

---

 src/mesa/drivers/dri/i965/brw_bufmgr.c | 49 +++++++---------------------------
 1 file changed, 9 insertions(+), 40 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_bufmgr.c b/src/mesa/drivers/dri/i965/brw_bufmgr.c
index 9e5847fb60..4ab72cd3e5 100644
--- a/src/mesa/drivers/dri/i965/brw_bufmgr.c
+++ b/src/mesa/drivers/dri/i965/brw_bufmgr.c
@@ -702,10 +702,12 @@ brw_bo_map_cpu(struct brw_context *brw, struct brw_bo *bo, unsigned flags)
 }
 
 static void *
-map_gtt(struct brw_bo *bo)
+brw_bo_map_gtt(struct brw_context *brw, struct brw_bo *bo, unsigned flags)
 {
    struct brw_bufmgr *bufmgr = bo->bufmgr;
 
+   pthread_mutex_lock(&bufmgr->lock);
+
    /* Get a mapping of the buffer if we haven't before. */
    if (bo->map_gtt == NULL) {
       struct drm_i915_gem_mmap_gtt mmap_arg;
@@ -721,6 +723,7 @@ map_gtt(struct brw_bo *bo)
       if (ret != 0) {
          DBG("%s:%d: Error preparing buffer map %d (%s): %s .\n",
              __FILE__, __LINE__, bo->gem_handle, bo->name, strerror(errno));
+         pthread_mutex_unlock(&bufmgr->lock);
          return NULL;
       }
 
@@ -731,39 +734,15 @@ map_gtt(struct brw_bo *bo)
          bo->map_gtt = NULL;
          DBG("%s:%d: Error mapping buffer %d (%s): %s .\n",
              __FILE__, __LINE__, bo->gem_handle, bo->name, strerror(errno));
+         pthread_mutex_unlock(&bufmgr->lock);
          return NULL;
       }
+      bo->map_count++;
    }
 
    DBG("bo_map_gtt: %d (%s) -> %p\n", bo->gem_handle, bo->name,
        bo->map_gtt);
 
-   bo->map_count++;
-   return bo->map_gtt;
-}
-
-static void *
-brw_bo_map_gtt(struct brw_context *brw, struct brw_bo *bo, unsigned flags)
-{
-   struct brw_bufmgr *bufmgr = bo->bufmgr;
-
-   pthread_mutex_lock(&bufmgr->lock);
-
-   void *map = map_gtt(bo);
-   if (map == NULL) {
-      pthread_mutex_unlock(&bufmgr->lock);
-      return NULL;
-   }
-
-   /* Now move it to the GTT domain so that the GPU and CPU
-    * caches are flushed and the GPU isn't actively using the
-    * buffer.
-    *
-    * The pagefault handler does this domain change for us when
-    * it has unbound the BO from the GTT, but it's up to us to
-    * tell it when we're about to use things if we had done
-    * rendering and it still happens to be bound to the GTT.
-    */
    if (!(flags & MAP_ASYNC)) {
       set_domain(brw, "GTT mapping", bo,
                  I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
@@ -773,7 +752,7 @@ brw_bo_map_gtt(struct brw_context *brw, struct brw_bo *bo, unsigned flags)
    VG(VALGRIND_MAKE_MEM_DEFINED(bo->map_gtt, bo->size));
    pthread_mutex_unlock(&bufmgr->lock);
 
-   return map;
+   return bo->map_gtt;
 }
 
 /**
@@ -804,18 +783,8 @@ brw_bo_map_unsynchronized(struct brw_context *brw, struct brw_bo *bo)
     */
    if (!bufmgr->has_llc)
       return brw_bo_map_gtt(brw, bo, MAP_READ | MAP_WRITE);
-
-   pthread_mutex_lock(&bufmgr->lock);
-
-   void *map = map_gtt(bo);
-   if (map != NULL) {
-      bo_mark_mmaps_incoherent(bo);
-      VG(VALGRIND_MAKE_MEM_DEFINED(bo->map_gtt, bo->size));
-   }
-
-   pthread_mutex_unlock(&bufmgr->lock);
-
-   return map;
+   else
+      return brw_bo_map_gtt(brw, bo, MAP_READ | MAP_WRITE | MAP_ASYNC);
 }
 
 static bool