drm/nouveau/bus/tu102-: prepare for GSP-RM

- disable BUS completely when GSP-RM detected
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230918202149.4343-8-skeggsb@gmail.com

drivers/gpu/drm/nouveau/nvkm/subdev/bus/gf100.c

@@ -24,6 +24,8 @@
  */
 #include "priv.h"
 
+#include <subdev/gsp.h>
+
 static void
 gf100_bus_intr(struct nvkm_bus *bus)
 {
@@ -72,5 +74,8 @@ int
 gf100_bus_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
 	      struct nvkm_bus **pbus)
 {
+	if (nvkm_gsp_rm(device->gsp))
+		return -ENODEV;
+
 	return nvkm_bus_new_(&gf100_bus, device, type, inst, pbus);
 }