drm/amdgpu: provide the page fault queue to the VM code

We are going to need that for recoverable page faults.

Signed-off-by: Christian König <[e-mail]>
Reviewed-by: Felix Kuehling <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 	const struct amdgpu_vm_pte_funcs	*vm_pte_funcs;
 	struct drm_sched_rq			*vm_pte_rqs[AMDGPU_MAX_RINGS];
 	unsigned				vm_pte_num_rqs;
+	struct amdgpu_ring			*page_fault;
 
 	/* partial resident texture handling */
 	spinlock_t				prt_lock;

drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c

···
 				&sched->sched_rq[DRM_SCHED_PRIORITY_KERNEL];
 		}
 		adev->vm_manager.vm_pte_num_rqs = adev->sdma.num_instances - 1;
+		adev->vm_manager.page_fault = &adev->sdma.instance[0].page;
 	} else {
 		for (i = 0; i < adev->sdma.num_instances; i++) {
 			sched = &adev->sdma.instance[i].ring.sched;