drm/radeon: rework the vm_flush interface

Pass the vm and ring index rather than an IB.  This allows
us to use the vm_flush interface for non-IB cases in the
future.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
diff --git a/drivers/gpu/drm/radeon/ni.c b/drivers/gpu/drm/radeon/ni.c
index f920a2c..9a46f7d 100644
--- a/drivers/gpu/drm/radeon/ni.c
+++ b/drivers/gpu/drm/radeon/ni.c
@@ -1565,10 +1565,9 @@
  * Update the page table base and flush the VM TLB
  * using the CP (cayman-si).
  */
-void cayman_vm_flush(struct radeon_device *rdev, struct radeon_ib *ib)
+void cayman_vm_flush(struct radeon_device *rdev, int ridx, struct radeon_vm *vm)
 {
-	struct radeon_ring *ring = &rdev->ring[ib->ring];
-	struct radeon_vm *vm = ib->vm;
+	struct radeon_ring *ring = &rdev->ring[ridx];
 
 	if (vm == NULL)
 		return;
@@ -1588,5 +1587,5 @@
 
 	/* bits 0-7 are the VM contexts0-7 */
 	radeon_ring_write(ring, PACKET0(VM_INVALIDATE_REQUEST, 0));
-	radeon_ring_write(ring, 1 << ib->vm->id);
+	radeon_ring_write(ring, 1 << vm->id);
 }