NV_MEM_ACCESS_WO
#define NV_MEM_ACCESS_RW (NV_MEM_ACCESS_RO | NV_MEM_ACCESS_WO)
dmaobj->access = NV_MEM_ACCESS_WO;
case NV_MEM_ACCESS_WO:
case NV_MEM_ACCESS_WO:
case NV_MEM_ACCESS_WO: