NV_PFIFO_INTR_SEMAPHORE
if (stat & NV_PFIFO_INTR_SEMAPHORE) {
stat &= ~NV_PFIFO_INTR_SEMAPHORE;
nvkm_wr32(device, NV03_PFIFO_INTR_0, NV_PFIFO_INTR_SEMAPHORE);