diff options
Diffstat (limited to 'drivers/s390/cio/cio.h')
| -rw-r--r-- | drivers/s390/cio/cio.h | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/drivers/s390/cio/cio.h b/drivers/s390/cio/cio.h new file mode 100644 index 000000000..92eabbb5f --- /dev/null +++ b/drivers/s390/cio/cio.h @@ -0,0 +1,149 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef S390_CIO_H +#define S390_CIO_H + +#include <linux/mutex.h> +#include <linux/device.h> +#include <linux/mod_devicetable.h> +#include <asm/chpid.h> +#include <asm/cio.h> +#include <asm/fcx.h> +#include <asm/schid.h> +#include "chsc.h" + +/* + * path management control word + */ +struct pmcw { + u32 intparm; /* interruption parameter */ + u32 qf : 1; /* qdio facility */ + u32 w : 1; + 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)); + +/* I/O-Interruption Code as stored by TEST PENDING INTERRUPTION (TPI). */ +struct tpi_info { + struct subchannel_id schid; + u32 intparm; + u32 adapter_IO:1; + u32 :1; + u32 isc:3; + u32 :27; + u32 type:3; + u32 :12; +} __packed __aligned(4); + +/* Target SCHIB configuration. */ +struct schib_config { + u64 mba; + u32 intparm; + u16 mbi; + u32 isc:3; + u32 ena:1; + u32 mme:2; + u32 mp:1; + u32 csense:1; + u32 mbfc:1; +} __attribute__ ((packed)); + +/* + * subchannel information block + */ +struct schib { + struct pmcw pmcw; /* path management control word */ + union scsw scsw; /* subchannel status word */ + __u64 mba; /* measurement block address */ + __u8 mda[4]; /* model dependent area */ +} __attribute__ ((packed,aligned(4))); + +/* + * When rescheduled, todo's with higher values will overwrite those + * with lower values. + */ +enum sch_todo { + SCH_TODO_NOTHING, + SCH_TODO_EVAL, + SCH_TODO_UNREG, +}; + +/* 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_MSG = 2, + SUBCHANNEL_TYPE_ADM = 3, + } st; /* subchannel type */ + __u8 vpm; /* verified path mask */ + __u8 lpm; /* logical path mask */ + __u8 opm; /* operational path mask */ + struct schib schib; /* subchannel information block */ + int isc; /* desired interruption subclass */ + struct chsc_ssd_info ssd_info; /* subchannel description */ + struct device dev; /* entry in device tree */ + struct css_driver *driver; + enum sch_todo todo; + struct work_struct todo_work; + struct schib_config config; +} __attribute__ ((aligned(8))); + +DECLARE_PER_CPU_ALIGNED(struct irb, cio_irb); + +#define to_subchannel(n) container_of(n, struct subchannel, dev) + +extern int cio_enable_subchannel(struct subchannel *, u32); +extern int cio_disable_subchannel (struct subchannel *); +extern int cio_cancel (struct subchannel *); +extern int cio_clear (struct subchannel *); +extern int cio_cancel_halt_clear(struct subchannel *, int *); +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_set_options (struct subchannel *, int); +extern int cio_update_schib(struct subchannel *sch); +extern int cio_commit_config(struct subchannel *sch); + +int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key); +int cio_tm_intrg(struct subchannel *sch); + +/* Use with care. */ +#ifdef CONFIG_CCW_CONSOLE +extern struct subchannel *cio_probe_console(void); +extern int cio_is_console(struct subchannel_id); +extern void cio_register_early_subchannels(void); +extern void cio_tsch(struct subchannel *sch); +#else +#define cio_is_console(schid) 0 +static inline void cio_register_early_subchannels(void) {} +#endif + +#endif |