drm/amdgpu/ring: add no_scheduler flag

This allows IPs to flag whether a specific ring requires
a GPU scheduler or not.  E.g., sometimes instances of an
IP are asymmetric and have different capabilities.

Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -223,6 +223,7 @@ struct amdgpu_ring {
 	unsigned		vm_inv_eng;
 	struct dma_fence	*vmid_wait;
 	bool			has_compute_vm_bug;
+	bool			no_scheduler;
 
 	atomic_t		num_jobs[DRM_SCHED_PRIORITY_MAX];
 	struct mutex		priority_mutex;