drivers/s390/cio/cio.h

   1 #ifndef S390_CIO_H
   2 #define S390_CIO_H
   3
   4 #include <linux/mutex.h>
   5 #include <linux/device.h>
   6 #include <linux/mod_devicetable.h>
   7 #include <asm/chpid.h>
   8 #include <asm/cio.h>
   9 #include <asm/fcx.h>
  10 #include <asm/schid.h>
  11 #include "chsc.h"
  12
  13 /*
  14  * path management control word
  15  */
  16 struct pmcw {
  17         u32 intparm;            /* interruption parameter */
  18         u32 qf   : 1;           /* qdio facility */
  19         u32 w    : 1;
  20         u32 isc  : 3;           /* interruption sublass */
  21         u32 res5 : 3;           /* reserved zeros */
  22         u32 ena  : 1;           /* enabled */
  23         u32 lm   : 2;           /* limit mode */
  24         u32 mme  : 2;           /* measurement-mode enable */
  25         u32 mp   : 1;           /* multipath mode */
  26         u32 tf   : 1;           /* timing facility */
  27         u32 dnv  : 1;           /* device number valid */
  28         u32 dev  : 16;          /* device number */
  29         u8  lpm;                /* logical path mask */
  30         u8  pnom;               /* path not operational mask */
  31         u8  lpum;               /* last path used mask */
  32         u8  pim;                /* path installed mask */
  33         u16 mbi;                /* measurement-block index */
  34         u8  pom;                /* path operational mask */
  35         u8  pam;                /* path available mask */
  36         u8  chpid[8];           /* CHPID 0-7 (if available) */
  37         u32 unused1 : 8;        /* reserved zeros */
  38         u32 st      : 3;        /* subchannel type */
  39         u32 unused2 : 18;       /* reserved zeros */
  40         u32 mbfc    : 1;        /* measurement block format control */
  41         u32 xmwme   : 1;        /* extended measurement word mode enable */
  42         u32 csense  : 1;        /* concurrent sense; can be enabled ...*/
  43                                 /*  ... per MSCH, however, if facility */
  44                                 /*  ... is not installed, this results */
  45                                 /*  ... in an operand exception.       */
  46 } __attribute__ ((packed));
  47
  48 /* Target SCHIB configuration. */
  49 struct schib_config {
  50         u64 mba;
  51         u32 intparm;
  52         u16 mbi;
  53         u32 isc:3;
  54         u32 ena:1;
  55         u32 mme:2;
  56         u32 mp:1;
  57         u32 csense:1;
  58         u32 mbfc:1;
  59 } __attribute__ ((packed));
  60
  61 /*
  62  * subchannel information block
  63  */
  64 struct schib {
  65         struct pmcw pmcw;        /* path management control word */
  66         union scsw scsw;         /* subchannel status word */
  67         __u64 mba;               /* measurement block address */
  68         __u8 mda[4];             /* model dependent area */
  69 } __attribute__ ((packed,aligned(4)));
  70
  71 /*
  72  * When rescheduled, todo's with higher values will overwrite those
  73  * with lower values.
  74  */
  75 enum sch_todo {
  76         SCH_TODO_NOTHING,
  77         SCH_TODO_EVAL,
  78         SCH_TODO_UNREG,
  79 };
  80
  81 /* subchannel data structure used by I/O subroutines */
  82 struct subchannel {
  83         struct subchannel_id schid;
  84         spinlock_t *lock;       /* subchannel lock */
  85         struct mutex reg_mutex;
  86         enum {
  87                 SUBCHANNEL_TYPE_IO = 0,
  88                 SUBCHANNEL_TYPE_CHSC = 1,
  89                 SUBCHANNEL_TYPE_MSG = 2,
  90                 SUBCHANNEL_TYPE_ADM = 3,
  91         } st;                   /* subchannel type */
  92         __u8 vpm;               /* verified path mask */
  93         __u8 lpm;               /* logical path mask */
  94         __u8 opm;               /* operational path mask */
  95         struct schib schib;     /* subchannel information block */
  96         int isc; /* desired interruption subclass */
  97         struct chsc_ssd_info ssd_info;  /* subchannel description */
  98         struct device dev;      /* entry in device tree */
  99         struct css_driver *driver;
 100         enum sch_todo todo;
 101         struct work_struct todo_work;
 102         struct schib_config config;
 103 } __attribute__ ((aligned(8)));
 104
 105 #define to_subchannel(n) container_of(n, struct subchannel, dev)
 106
 107 extern int cio_validate_subchannel (struct subchannel *, struct subchannel_id);
 108 extern int cio_enable_subchannel(struct subchannel *, u32);
 109 extern int cio_disable_subchannel (struct subchannel *);
 110 extern int cio_cancel (struct subchannel *);
 111 extern int cio_clear (struct subchannel *);
 112 extern int cio_resume (struct subchannel *);
 113 extern int cio_halt (struct subchannel *);
 114 extern int cio_start (struct subchannel *, struct ccw1 *, __u8);
 115 extern int cio_start_key (struct subchannel *, struct ccw1 *, __u8, __u8);
 116 extern int cio_cancel (struct subchannel *);
 117 extern int cio_set_options (struct subchannel *, int);
 118 extern int cio_update_schib(struct subchannel *sch);
 119 extern int cio_commit_config(struct subchannel *sch);
 120
 121 int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key);
 122 int cio_tm_intrg(struct subchannel *sch);
 123
 124 /* Use with care. */
 125 #ifdef CONFIG_CCW_CONSOLE
 126 extern struct subchannel *cio_probe_console(void);
 127 extern int cio_is_console(struct subchannel_id);
 128 extern void cio_register_early_subchannels(void);
 129 extern void cio_tsch(struct subchannel *sch);
 130 #else
 131 #define cio_is_console(schid) 0
 132 static inline void cio_register_early_subchannels(void) {}
 133 #endif
 134
 135 #endif