diff options
Diffstat (limited to 'arch/powerpc/platforms/powernv/vas.h')
| -rw-r--r-- | arch/powerpc/platforms/powernv/vas.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/vas.h b/arch/powerpc/platforms/powernv/vas.h index 756cbc5335bc..ae0100fd35bb 100644 --- a/arch/powerpc/platforms/powernv/vas.h +++ b/arch/powerpc/platforms/powernv/vas.h @@ -447,4 +447,32 @@ static inline u64 read_hvwc_reg(struct vas_window *win, return in_be64(win->hvwc_map+reg); } +/* + * Encode/decode the Partition Send Window ID (PSWID) for a window in + * a way that we can uniquely identify any window in the system. i.e. + * we should be able to locate the 'struct vas_window' given the PSWID. + * + * Bits Usage + * 0:7 VAS id (8 bits) + * 8:15 Unused, 0 (3 bits) + * 16:31 Window id (16 bits) + */ +static inline u32 encode_pswid(int vasid, int winid) +{ + u32 pswid = 0; + + pswid |= vasid << (31 - 7); + pswid |= winid; + + return pswid; +} + +static inline void decode_pswid(u32 pswid, int *vasid, int *winid) +{ + if (vasid) + *vasid = pswid >> (31 - 7) & 0xFF; + + if (winid) + *winid = pswid & 0xFFFF; +} #endif /* _VAS_H */ |