LXR linux/drivers/s390/cio/cio.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef S390_CIO_H
   3#define S390_CIO_H
   4
   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 word
  17 */
  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 block
  65 */
  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 those
  75 * 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        char *driver_override; /* Driver name to force a match */
 107} __attribute__ ((aligned(8)));
 108
 109DECLARE_PER_CPU_ALIGNED(struct irb, cio_irb);
 110
 111#define to_subchannel(n) container_of(n, struct subchannel, dev)
 112
 113extern int cio_enable_subchannel(struct subchannel *, u32);
 114extern int cio_disable_subchannel (struct subchannel *);
 115extern int cio_cancel (struct subchannel *);
 116extern int cio_clear (struct subchannel *);
 117extern int cio_cancel_halt_clear(struct subchannel *, int *);
 118extern int cio_resume (struct subchannel *);
 119extern int cio_halt (struct subchannel *);
 120extern int cio_start (struct subchannel *, struct ccw1 *, __u8);
 121extern int cio_start_key (struct subchannel *, struct ccw1 *, __u8, __u8);
 122extern int cio_set_options (struct subchannel *, int);
 123extern int cio_update_schib(struct subchannel *sch);
 124extern int cio_commit_config(struct subchannel *sch);
 125
 126int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key);
 127int cio_tm_intrg(struct subchannel *sch);
 128
 129extern int __init airq_init(void);
 130
 131/* Use with care. */
 132#ifdef CONFIG_CCW_CONSOLE
 133extern struct subchannel *cio_probe_console(void);
 134extern int cio_is_console(struct subchannel_id);
 135extern void cio_register_early_subchannels(void);
 136extern void cio_tsch(struct subchannel *sch);
 137#else
 138#define cio_is_console(schid) 0
 139static inline void cio_register_early_subchannels(void) {}
 140#endif
 141
 142#endif
 143