NV04_PFIFO_CACHE1_DMA_PUSH
nvkm_wr32(device, NV04_PFIFO_CACHE1_DMA_PUSH, 0);
nvkm_wr32(device, NV04_PFIFO_CACHE1_DMA_PUSH,
nvkm_rd32(device, NV04_PFIFO_CACHE1_DMA_PUSH) | 1);
nvkm_mask(device, NV04_PFIFO_CACHE1_DMA_PUSH, 0x00000001, 0);