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.c

@@ -261,7 +261,8 @@ int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,
 	mutex_init(&ring->priority_mutex);
 
 	if (ring->funcs->type >= AMDGPU_RING_TYPE_GFX &&
-	    ring->funcs->type <= AMDGPU_RING_TYPE_VCN_JPEG) {
+	    ring->funcs->type <= AMDGPU_RING_TYPE_VCN_JPEG &&
+	    !ring->no_scheduler) {
 		hw_ip = ring->funcs->type;
 		num_sched = &adev->gpu_sched[hw_ip][hw_prio].num_scheds;
 		adev->gpu_sched[hw_ip][hw_prio].sched[(*num_sched)++] =

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;