mxms_structlen
size = mxms_headerlen(mxm) + mxms_structlen(mxm);
u8 *fini = desc + mxms_structlen(mxm) - 1;
u16 size = mxms_headerlen(mxm) + mxms_structlen(mxm);
u16 mxms_structlen(struct nvkm_mxm *);