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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>
57 lines
1.0 KiB
C
57 lines
1.0 KiB
C
/*
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* drivers/s390/cio/chpid.h
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*
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* Copyright IBM Corp. 2007
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* Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
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*/
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#ifndef _ASM_S390_CHPID_H
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#define _ASM_S390_CHPID_H _ASM_S390_CHPID_H
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#include <linux/string.h>
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#include <asm/types.h>
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#define __MAX_CHPID 255
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struct chp_id {
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u8 reserved1;
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u8 cssid;
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u8 reserved2;
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u8 id;
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} __attribute__((packed));
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static inline void chp_id_init(struct chp_id *chpid)
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{
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memset(chpid, 0, sizeof(struct chp_id));
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}
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static inline int chp_id_is_equal(struct chp_id *a, struct chp_id *b)
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{
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return (a->id == b->id) && (a->cssid == b->cssid);
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}
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static inline void chp_id_next(struct chp_id *chpid)
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{
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if (chpid->id < __MAX_CHPID)
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chpid->id++;
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else {
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chpid->id = 0;
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chpid->cssid++;
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}
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}
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#ifdef __KERNEL__
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#include <asm/cio.h>
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static inline int chp_id_is_valid(struct chp_id *chpid)
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{
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return (chpid->cssid <= __MAX_CSSID);
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}
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#define chp_id_for_each(c) \
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for (chp_id_init(c); chp_id_is_valid(c); chp_id_next(c))
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#endif /* __KERNEL */
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#endif /* _ASM_S390_CHPID_H */
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