6ab4879a0d
Add a reg_mutex to prevent unregistering a subchannel before it has been registered. Since 2.6.17, we've seen oopses in kslowcrw when a device is found to be not operational during sense id when doing initial device recognition; it is not clear yet why that particular problem was not (yet) observed with earlier kernels... Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
147 lines
5 KiB
C
147 lines
5 KiB
C
#ifndef S390_CIO_H
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#define S390_CIO_H
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#include "schid.h"
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#include <linux/mutex.h>
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/*
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* where we put the ssd info
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*/
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struct ssd_info {
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__u8 valid:1;
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__u8 type:7; /* subchannel type */
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__u8 chpid[8]; /* chpids */
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__u16 fla[8]; /* full link addresses */
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} __attribute__ ((packed));
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/*
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* path management control word
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*/
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struct pmcw {
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__u32 intparm; /* interruption parameter */
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__u32 qf : 1; /* qdio facility */
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__u32 res0 : 1; /* reserved zeros */
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__u32 isc : 3; /* interruption sublass */
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__u32 res5 : 3; /* reserved zeros */
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__u32 ena : 1; /* enabled */
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__u32 lm : 2; /* limit mode */
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__u32 mme : 2; /* measurement-mode enable */
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__u32 mp : 1; /* multipath mode */
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__u32 tf : 1; /* timing facility */
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__u32 dnv : 1; /* device number valid */
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__u32 dev : 16; /* device number */
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__u8 lpm; /* logical path mask */
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__u8 pnom; /* path not operational mask */
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__u8 lpum; /* last path used mask */
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__u8 pim; /* path installed mask */
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__u16 mbi; /* measurement-block index */
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__u8 pom; /* path operational mask */
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__u8 pam; /* path available mask */
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__u8 chpid[8]; /* CHPID 0-7 (if available) */
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__u32 unused1 : 8; /* reserved zeros */
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__u32 st : 3; /* subchannel type */
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__u32 unused2 : 18; /* reserved zeros */
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__u32 mbfc : 1; /* measurement block format control */
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__u32 xmwme : 1; /* extended measurement word mode enable */
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__u32 csense : 1; /* concurrent sense; can be enabled ...*/
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/* ... per MSCH, however, if facility */
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/* ... is not installed, this results */
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/* ... in an operand exception. */
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} __attribute__ ((packed));
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/*
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* subchannel information block
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*/
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struct schib {
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struct pmcw pmcw; /* path management control word */
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struct scsw scsw; /* subchannel status word */
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__u64 mba; /* measurement block address */
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__u8 mda[4]; /* model dependent area */
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} __attribute__ ((packed,aligned(4)));
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/*
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* operation request block
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*/
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struct orb {
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__u32 intparm; /* interruption parameter */
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__u32 key : 4; /* flags, like key, suspend control, etc. */
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__u32 spnd : 1; /* suspend control */
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__u32 res1 : 1; /* reserved */
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__u32 mod : 1; /* modification control */
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__u32 sync : 1; /* synchronize control */
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__u32 fmt : 1; /* format control */
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__u32 pfch : 1; /* prefetch control */
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__u32 isic : 1; /* initial-status-interruption control */
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__u32 alcc : 1; /* address-limit-checking control */
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__u32 ssic : 1; /* suppress-suspended-interr. control */
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__u32 res2 : 1; /* reserved */
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__u32 c64 : 1; /* IDAW/QDIO 64 bit control */
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__u32 i2k : 1; /* IDAW 2/4kB block size control */
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__u32 lpm : 8; /* logical path mask */
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__u32 ils : 1; /* incorrect length */
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__u32 zero : 6; /* reserved zeros */
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__u32 orbx : 1; /* ORB extension control */
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__u32 cpa; /* channel program address */
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} __attribute__ ((packed,aligned(4)));
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/* subchannel data structure used by I/O subroutines */
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struct subchannel {
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struct subchannel_id schid;
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spinlock_t lock; /* subchannel lock */
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struct mutex reg_mutex;
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enum {
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SUBCHANNEL_TYPE_IO = 0,
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SUBCHANNEL_TYPE_CHSC = 1,
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SUBCHANNEL_TYPE_MESSAGE = 2,
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SUBCHANNEL_TYPE_ADM = 3,
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} st; /* subchannel type */
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struct {
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unsigned int suspend:1; /* allow suspend */
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unsigned int prefetch:1;/* deny prefetch */
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unsigned int inter:1; /* suppress intermediate interrupts */
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} __attribute__ ((packed)) options;
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__u8 vpm; /* verified path mask */
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__u8 lpm; /* logical path mask */
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__u8 opm; /* operational path mask */
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struct schib schib; /* subchannel information block */
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struct orb orb; /* operation request block */
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struct ccw1 sense_ccw; /* static ccw for sense command */
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struct ssd_info ssd_info; /* subchannel description */
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struct device dev; /* entry in device tree */
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struct css_driver *driver;
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} __attribute__ ((aligned(8)));
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#define IO_INTERRUPT_TYPE 0 /* I/O interrupt type */
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#define to_subchannel(n) container_of(n, struct subchannel, dev)
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extern int cio_validate_subchannel (struct subchannel *, struct subchannel_id);
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extern int cio_enable_subchannel (struct subchannel *, unsigned int);
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extern int cio_disable_subchannel (struct subchannel *);
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extern int cio_cancel (struct subchannel *);
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extern int cio_clear (struct subchannel *);
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extern int cio_resume (struct subchannel *);
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extern int cio_halt (struct subchannel *);
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extern int cio_start (struct subchannel *, struct ccw1 *, __u8);
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extern int cio_start_key (struct subchannel *, struct ccw1 *, __u8, __u8);
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extern int cio_cancel (struct subchannel *);
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extern int cio_set_options (struct subchannel *, int);
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extern int cio_get_options (struct subchannel *);
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extern int cio_modify (struct subchannel *);
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/* Use with care. */
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#ifdef CONFIG_CCW_CONSOLE
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extern struct subchannel *cio_probe_console(void);
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extern void cio_release_console(void);
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extern int cio_is_console(struct subchannel_id);
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extern struct subchannel *cio_get_console_subchannel(void);
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#else
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#define cio_is_console(schid) 0
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#define cio_get_console_subchannel() NULL
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#endif
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extern int cio_show_msg;
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#endif
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