[PATCH 4/6] drm/amdgpu: Add UAPI for disabling implicit sync per submission.

[Bas Nieuwenhuizen]

Per submission flag because:

1) Slightly simpler & more flexible than per context flag.
2) We'd need to extend the per-BO struct if we want to put
   it there.
3) Doing it per BO is annoying implementation wise as we
   disassociate it from the BO list before doing the fences.
4) I don't really anticipate an usecase for doing it per BO.
   (e.g. I don't think we need to selectively do implicit in
    radv and I don't see radeonsi tracking READ vs. WRITE at
    this point.)

Signed-off-by: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
---
 include/uapi/drm/amdgpu_drm.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/uapi/drm/amdgpu_drm.h b/include/uapi/drm/amdgpu_drm.h
index 96e32dafd4f0..d91fa707575c 100644
--- a/include/uapi/drm/amdgpu_drm.h
+++ b/include/uapi/drm/amdgpu_drm.h
@@ -610,6 +610,12 @@ struct drm_amdgpu_gem_va {
 #define AMDGPU_CHUNK_ID_SYNCOBJ_TIMELINE_SIGNAL  0x09
 #define AMDGPU_CHUNK_ID_CP_GFX_SHADOW   0x0a
 
+
+#define AMDGPU_CS_FLAGS_MASK       0x1
+/* Disable implicit sync on BOs wrt other
+ * submissions. */
+#define AMDGPU_CS_NO_IMPLICIT_SYNC 1
+
 struct drm_amdgpu_cs_chunk {
 	__u32		chunk_id;
 	__u32		length_dw;
-- 
2.45.2