gbm: Add GBM_BO_USE_LINEAR flag

Signed-off-by: Flora Cui <flora.cui@amd.com>
Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

src/gbm/backends/dri/gbm_dri.c

@@ -858,6 +858,8 @@ gbm_dri_bo_create(struct gbm_device *gbm,
       dri_use |= __DRI_IMAGE_USE_SCANOUT;
    if (usage & GBM_BO_USE_CURSOR)
       dri_use |= __DRI_IMAGE_USE_CURSOR;
+   if (usage & GBM_BO_USE_LINEAR)
+      dri_use |= __DRI_IMAGE_USE_LINEAR;
 
    /* Gallium drivers requires shared in order to get the handle/stride */
    dri_use |= __DRI_IMAGE_USE_SHARE;

src/gbm/main/gbm.h

@@ -209,6 +209,10 @@ enum gbm_bo_flags {
     * with GBM_BO_USE_CURSOR. but may not work for other combinations.
     */
    GBM_BO_USE_WRITE    = (1 << 3),
+   /**
+    * Buffer is linear, i.e. not tiled.
+    */
+   GBM_BO_USE_LINEAR = (1 << 4),
 };
 
 int