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https://github.com/edk2-porting/linux-next.git
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9d92a7e1b0
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>
128 lines
4.2 KiB
C
128 lines
4.2 KiB
C
#ifndef S390_CIO_H
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#define S390_CIO_H
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#include <linux/mutex.h>
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#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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#include <asm/chpid.h>
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#include <asm/cio.h>
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#include <asm/fcx.h>
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#include <asm/schid.h>
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#include "chsc.h"
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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 w : 1;
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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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union 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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/* 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_MSG = 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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int isc; /* desired interruption subclass */
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struct chsc_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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void *private; /* private per subchannel type data */
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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 *, u32);
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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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int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key);
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int cio_tm_intrg(struct subchannel *sch);
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int cio_create_sch_lock(struct subchannel *);
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void do_adapter_IO(u8 isc);
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void do_IRQ(struct pt_regs *);
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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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extern spinlock_t * cio_get_console_lock(void);
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extern void *cio_get_console_priv(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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#define cio_get_console_lock() NULL
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#define cio_get_console_priv() NULL
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#endif
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#endif
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