iowrite16_native
#define nvif_wr16(a,b,c) nvif_wr((a), iowrite16_native, 2, (b), (u16)(c))
#define nvkm_wr16(d,a,v) iowrite16_native((v), (d)->pri + (a))
iowrite16_native(val, (void __force __iomem *)mem);