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