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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>
29 lines
593 B
C
29 lines
593 B
C
#ifndef ASM_SCHID_H
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#define ASM_SCHID_H
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struct subchannel_id {
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__u32 cssid : 8;
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__u32 : 4;
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__u32 m : 1;
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__u32 ssid : 2;
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__u32 one : 1;
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__u32 sch_no : 16;
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} __attribute__ ((packed, aligned(4)));
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/* Helper function for sane state of pre-allocated subchannel_id. */
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static inline void
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init_subchannel_id(struct subchannel_id *schid)
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{
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memset(schid, 0, sizeof(struct subchannel_id));
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schid->one = 1;
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}
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static inline int
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schid_equal(struct subchannel_id *schid1, struct subchannel_id *schid2)
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{
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return !memcmp(schid1, schid2, sizeof(struct subchannel_id));
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}
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#endif /* ASM_SCHID_H */
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