From 9d92a7e1b0d095c8be96ce5e592c6c5541684631 Mon Sep 17 00:00:00 2001 From: Cornelia Huck Date: Mon, 14 Jul 2008 09:59:05 +0200 Subject: [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 Signed-off-by: Martin Schwidefsky Signed-off-by: Heiko Carstens --- include/asm-s390/schid.h | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 include/asm-s390/schid.h (limited to 'include/asm-s390/schid.h') diff --git a/include/asm-s390/schid.h b/include/asm-s390/schid.h new file mode 100644 index 000000000000..5017ffa78e04 --- /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 */ -- cgit v1.2.3