diff options
| author | Cornelia Huck <cornelia.huck@de.ibm.com> | 2008-07-14 09:59:05 +0200 |
|---|---|---|
| committer | Heiko Carstens <heiko.carstens@de.ibm.com> | 2008-07-14 10:02:12 +0200 |
| commit | 9d92a7e1b0d095c8be96ce5e592c6c5541684631 (patch) | |
| tree | 22cfca810de07a7d7f87f17a89de0ae10d462038 /include/asm-s390/schid.h | |
| parent | 683c5418e6ac9f40f925dab6f547a5b0a4ad43c6 (diff) | |
[S390] cio: Add chsc subchannel driver.
This patch adds a driver for subchannels of type chsc.
A device /dev/chsc is created which may be used to issue ioctls to:
- obtain information about the machine's I/O configuration
- dynamically change the machine's I/O configuration via
asynchronous chsc commands
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Diffstat (limited to 'include/asm-s390/schid.h')
| -rw-r--r-- | include/asm-s390/schid.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/include/asm-s390/schid.h b/include/asm-s390/schid.h new file mode 100644 index 00000000000..5017ffa78e0 --- /dev/null +++ b/include/asm-s390/schid.h @@ -0,0 +1,28 @@ +#ifndef ASM_SCHID_H +#define ASM_SCHID_H + +struct subchannel_id { + __u32 cssid : 8; + __u32 : 4; + __u32 m : 1; + __u32 ssid : 2; + __u32 one : 1; + __u32 sch_no : 16; +} __attribute__ ((packed, aligned(4))); + + +/* Helper function for sane state of pre-allocated subchannel_id. */ +static inline void +init_subchannel_id(struct subchannel_id *schid) +{ + memset(schid, 0, sizeof(struct subchannel_id)); + schid->one = 1; +} + +static inline int +schid_equal(struct subchannel_id *schid1, struct subchannel_id *schid2) +{ + return !memcmp(schid1, schid2, sizeof(struct subchannel_id)); +} + +#endif /* ASM_SCHID_H */ |