drm/radeon/kms: add info query for backend map

The 3D driver need to get the pipe to backend
map to certain things.  Add a query to get the
info.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/drm/radeon_drm.h b/include/drm/radeon_drm.h
index 787f7b6fd622..b65be6054a18 100644
--- a/include/drm/radeon_drm.h
+++ b/include/drm/radeon_drm.h
@@ -911,6 +911,7 @@ struct drm_radeon_cs {
 #define RADEON_INFO_NUM_BACKENDS        0x0a /* DB/backends for r600+ - need for OQ */
 #define RADEON_INFO_NUM_TILE_PIPES      0x0b /* tile pipes for r600+ */
 #define RADEON_INFO_FUSION_GART_WORKING 0x0c /* fusion writes to GTT were broken before this */
+#define RADEON_INFO_BACKEND_MAP         0x0d /* pipe to backend map, needed by mesa */
 
 struct drm_radeon_info {
         uint32_t                request;