drm/nvc0: import initial vm backend

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 42d1ad6..d17ffea 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -909,8 +909,9 @@
 			break;
 		}
 
-		ret = nouveau_vm_get(dev_priv->bar1_vm, mem->bus.size, 12,
-				     NV_MEM_ACCESS_RW, &vram->bar_vma);
+		ret = nouveau_vm_get(dev_priv->bar1_vm, mem->bus.size,
+				     vram->page_shift, NV_MEM_ACCESS_RW,
+				     &vram->bar_vma);
 		if (ret)
 			return ret;