SILI_CMD_LEN
xa->tag * SILI_CMD_LEN, SILI_CMD_LEN, BUS_DMASYNC_PREWRITE);
xa->tag * SILI_CMD_LEN, SILI_CMD_LEN, BUS_DMASYNC_POSTWRITE);
bzero(ccb->ccb_cmd, SILI_CMD_LEN);
sp->sp_cmds = sili_dmamem_alloc(sc, SILI_CMD_LEN * SILI_MAX_CMDS,
ccb->ccb_cmd = SILI_DMA_KVA(sp->sp_cmds) + i * SILI_CMD_LEN;
ccb->ccb_cmd_dva = SILI_DMA_DVA(sp->sp_cmds) + i * SILI_CMD_LEN;