drm/amdgpu: Add new ring callback to insert memory sync

Used to flush and invalidate various caches.

v2: Rename function hook

Signed-off-by: Andrey Grodzovsky <[email protected]>
Reviewed-by: Luben Tuikov <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

Author: Andrey Grodzovsky

drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h

@@ -195,6 +195,7 @@ struct amdgpu_ring_funcs {
 	/* Try to soft recover the ring to make the fence signal */
 	void (*soft_recovery)(struct amdgpu_ring *ring, unsigned vmid);
 	int (*preempt_ib)(struct amdgpu_ring *ring);
+	void (*emit_mem_sync)(struct amdgpu_ring *ring);
 };
 
 struct amdgpu_ring {