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  */
  18 struct pmcw {
  19         u32 intparm;            /* interruption parameter */
  20         u32 qf   : 1;           /* qdio facility */
  21         u32 w    : 1;
  22         u32 isc  : 3;           /* interruption subclass */
  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. */
  51 struct 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  */
  66 struct 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  */
  77 enum 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 */
  84 struct 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 core
 108          * frees it.  Use driver_set_override() to set or clear it.
 109          */
 110         const char *driver_override;
 111 } __attribute__ ((aligned(8)));
 112
 113 DECLARE_PER_CPU_ALIGNED(struct irb, cio_irb);
 114
 115 #define to_subchannel(n) container_of(n, struct subchannel, dev)
 116
 117 extern int cio_enable_subchannel(struct subchannel *, u32);
 118 extern int cio_disable_subchannel (struct subchannel *);
 119 extern int cio_cancel (struct subchannel *);
 120 extern int cio_clear (struct subchannel *);
 121 extern int cio_cancel_halt_clear(struct subchannel *, int *);
 122 extern int cio_resume (struct subchannel *);
 123 extern int cio_halt (struct subchannel *);
 124 extern int cio_start (struct subchannel *, struct ccw1 *, __u8);
 125 extern int cio_start_key (struct subchannel *, struct ccw1 *, __u8, __u8);
 126 extern int cio_set_options (struct subchannel *, int);
 127 extern int cio_update_schib(struct subchannel *sch);
 128 extern int cio_commit_config(struct subchannel *sch);
 129
 130 int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key);
 131 int cio_tm_intrg(struct subchannel *sch);
 132
 133 extern int __init airq_init(void);
 134
 135 /* Use with care. */
 136 #ifdef CONFIG_CCW_CONSOLE
 137 extern struct subchannel *cio_probe_console(void);
 138 extern int cio_is_console(struct subchannel_id);
 139 extern void cio_register_early_subchannels(void);
 140 extern void cio_tsch(struct subchannel *sch);
 141 #else
 142 #define cio_is_console(schid) 0
 143 static inline void cio_register_early_subchannels(void) {}
 144 #endif
 145
 146 #endif