nvkm_sw_mthd
bool nvkm_sw_mthd(struct nvkm_sw *sw, int chid, int subc, u32 mthd, u32 data);
if (nvkm_sw_mthd(device->sw, chid, subc, mthd, data))
handled = nvkm_sw_mthd(sw, chid, subc, mthd, data);