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1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef S390_CIO_H3#define S390_CIO_H4 5#include <linux/mutex.h>6#include <linux/device.h>7#include <linux/mod_devicetable.h>8#include <asm/chpid.h>9#include <asm/cio.h>10#include <asm/fcx.h>11#include <asm/schid.h>12#include <asm/tpi.h>13#include "chsc.h"14 15/*16 * path management control word17 */18struct pmcw {19 u32 intparm; /* interruption parameter */20 u32 qf : 1; /* qdio facility */21 u32 w : 1;22 u32 isc : 3; /* interruption sublass */23 u32 res5 : 3; /* reserved zeros */24 u32 ena : 1; /* enabled */25 u32 lm : 2; /* limit mode */26 u32 mme : 2; /* measurement-mode enable */27 u32 mp : 1; /* multipath mode */28 u32 tf : 1; /* timing facility */29 u32 dnv : 1; /* device number valid */30 u32 dev : 16; /* device number */31 u8 lpm; /* logical path mask */32 u8 pnom; /* path not operational mask */33 u8 lpum; /* last path used mask */34 u8 pim; /* path installed mask */35 u16 mbi; /* measurement-block index */36 u8 pom; /* path operational mask */37 u8 pam; /* path available mask */38 u8 chpid[8]; /* CHPID 0-7 (if available) */39 u32 unused1 : 8; /* reserved zeros */40 u32 st : 3; /* subchannel type */41 u32 unused2 : 18; /* reserved zeros */42 u32 mbfc : 1; /* measurement block format control */43 u32 xmwme : 1; /* extended measurement word mode enable */44 u32 csense : 1; /* concurrent sense; can be enabled ...*/45 /* ... per MSCH, however, if facility */46 /* ... is not installed, this results */47 /* ... in an operand exception. */48} __attribute__ ((packed));49 50/* Target SCHIB configuration. */51struct schib_config {52 u64 mba;53 u32 intparm;54 u16 mbi;55 u32 isc:3;56 u32 ena:1;57 u32 mme:2;58 u32 mp:1;59 u32 csense:1;60 u32 mbfc:1;61} __attribute__ ((packed));62 63/*64 * subchannel information block65 */66struct schib {67 struct pmcw pmcw; /* path management control word */68 union scsw scsw; /* subchannel status word */69 __u64 mba; /* measurement block address */70 __u8 mda[4]; /* model dependent area */71} __attribute__ ((packed,aligned(4)));72 73/*74 * When rescheduled, todo's with higher values will overwrite those75 * with lower values.76 */77enum sch_todo {78 SCH_TODO_NOTHING,79 SCH_TODO_EVAL,80 SCH_TODO_UNREG,81};82 83/* subchannel data structure used by I/O subroutines */84struct subchannel {85 struct subchannel_id schid;86 spinlock_t lock; /* subchannel lock */87 struct mutex reg_mutex;88 enum {89 SUBCHANNEL_TYPE_IO = 0,90 SUBCHANNEL_TYPE_CHSC = 1,91 SUBCHANNEL_TYPE_MSG = 2,92 SUBCHANNEL_TYPE_ADM = 3,93 } st; /* subchannel type */94 __u8 vpm; /* verified path mask */95 __u8 lpm; /* logical path mask */96 __u8 opm; /* operational path mask */97 struct schib schib; /* subchannel information block */98 int isc; /* desired interruption subclass */99 struct chsc_ssd_info ssd_info; /* subchannel description */100 struct device dev; /* entry in device tree */101 struct css_driver *driver;102 enum sch_todo todo;103 struct work_struct todo_work;104 struct schib_config config;105 u64 dma_mask;106 /*107 * Driver name to force a match. Do not set directly, because core108 * frees it. Use driver_set_override() to set or clear it.109 */110 const char *driver_override;111} __attribute__ ((aligned(8)));112 113DECLARE_PER_CPU_ALIGNED(struct irb, cio_irb);114 115#define to_subchannel(n) container_of(n, struct subchannel, dev)116 117extern int cio_enable_subchannel(struct subchannel *, u32);118extern int cio_disable_subchannel (struct subchannel *);119extern int cio_cancel (struct subchannel *);120extern int cio_clear (struct subchannel *);121extern int cio_cancel_halt_clear(struct subchannel *, int *);122extern int cio_resume (struct subchannel *);123extern int cio_halt (struct subchannel *);124extern int cio_start (struct subchannel *, struct ccw1 *, __u8);125extern int cio_start_key (struct subchannel *, struct ccw1 *, __u8, __u8);126extern int cio_set_options (struct subchannel *, int);127extern int cio_update_schib(struct subchannel *sch);128extern int cio_commit_config(struct subchannel *sch);129 130int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key);131int cio_tm_intrg(struct subchannel *sch);132 133extern int __init airq_init(void);134 135/* Use with care. */136#ifdef CONFIG_CCW_CONSOLE137extern struct subchannel *cio_probe_console(void);138extern int cio_is_console(struct subchannel_id);139extern void cio_register_early_subchannels(void);140extern void cio_tsch(struct subchannel *sch);141#else142#define cio_is_console(schid) 0143static inline void cio_register_early_subchannels(void) {}144#endif145 146#endif147