intel: tell libdrm whether we want a cpu-ready or gpu-ready BO for regions.

This lets us avoid allocing new buffers for renderbuffers, finalized miptrees,
and PBO-uploaded textures when there's an unreferenced but still active one
cached, while also avoiding CPU waits for batchbuffers and CPU-uploaded
textures.  The size of BOs allocated for a desktop running current GL
cairogears on i915 is cut in half with this.

Note that this means we require libdrm 2.4.5.

1 files changed, 9 insertions, 3 deletions

diff --git a/src/mesa/drivers/dri/intel/intel_regions.c b/src/mesa/drivers/dri/intel/intel_regions.c
index ec85c4131a..749920502a 100644
--- a/src/mesa/drivers/dri/intel/intel_regions.c
+++ b/src/mesa/drivers/dri/intel/intel_regions.c
@@ -109,12 +109,18 @@ intel_region_alloc_internal(struct intel_context *intel,
 
 struct intel_region *
 intel_region_alloc(struct intel_context *intel,
-                   GLuint cpp, GLuint width, GLuint height, GLuint pitch)
+                   GLuint cpp, GLuint width, GLuint height, GLuint pitch,
+		   GLboolean expect_accelerated_upload)
 {
    dri_bo *buffer;
 
-   buffer = dri_bo_alloc(intel->bufmgr, "region",
-			 pitch * cpp * height, 64);
+   if (expect_accelerated_upload) {
+      buffer = drm_intel_bo_alloc_for_render(intel->bufmgr, "region",
+					     pitch * cpp * height, 64);
+   } else {
+      buffer = drm_intel_bo_alloc(intel->bufmgr, "region",
+				  pitch * cpp * height, 64);
+   }
 
    return intel_region_alloc_internal(intel, cpp, width, height, pitch, buffer);
 }