Since this is UAPI, it's good to document what exactly the guarantees
we're providing are.
Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>
---
include/uapi/drm/v3d_drm.h | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/include/uapi/drm/v3d_drm.h b/include/uapi/drm/v3d_drm.h
index 7b6627783608..f446656d00b1 100644
--- a/include/uapi/drm/v3d_drm.h
+++ b/include/uapi/drm/v3d_drm.h
@@ -58,6 +58,11 @@ struct drm_v3d_submit_cl {
* coordinate shader to determine where primitives land on the screen,
* then writes out the state updates and draw calls necessary per tile
* to the tile allocation BO.
+ *
+ * This BCL will block on any previous BCL submitted on the
+ * same FD, but not on any RCL or BCLs submitted by other
+ * clients -- that is left up to the submitter to control
+ * using in_sync_bcl if necessary.
*/
__u32 bcl_start;
@@ -69,6 +74,11 @@ struct drm_v3d_submit_cl {
* This is the second set of commands executed, which will either
* execute the tiles that have been set up by the BCL, or a fixed set
* of tiles (in the case of RCL-only blits).
+ *
+ * This RCL will block on this submit's BCL, and any previous
+ * RCL submitted on the same FD, but not on any RCL or BCLs
+ * submitted by other clients -- that is left up to the
+ * submitter to control using in_sync_rcl if necessary.
*/
__u32 rcl_start;
--
2.18.0
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