release/src-rt-6.x/linux/linux-2.6/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 <asm/chpid.h>
   7 #include "chsc.h"
   8 #include "schid.h"
   9
  10 /*
  11  * path management control word
  12  */
  13 struct pmcw {
  14         __u32 intparm;          /* interruption parameter */
  15         __u32 qf   : 1;         /* qdio facility */
  16         __u32 res0 : 1;         /* reserved zeros */
  17         __u32 isc  : 3;         /* interruption sublass */
  18         __u32 res5 : 3;         /* reserved zeros */
  19         __u32 ena  : 1;         /* enabled */
  20         __u32 lm   : 2;         /* limit mode */
  21         __u32 mme  : 2;         /* measurement-mode enable */
  22         __u32 mp   : 1;         /* multipath mode */
  23         __u32 tf   : 1;         /* timing facility */
  24         __u32 dnv  : 1;         /* device number valid */
  25         __u32 dev  : 16;        /* device number */
  26         __u8  lpm;              /* logical path mask */
  27         __u8  pnom;             /* path not operational mask */
  28         __u8  lpum;             /* last path used mask */
  29         __u8  pim;              /* path installed mask */
  30         __u16 mbi;              /* measurement-block index */
  31         __u8  pom;              /* path operational mask */
  32         __u8  pam;              /* path available mask */
  33         __u8  chpid[8];         /* CHPID 0-7 (if available) */
  34         __u32 unused1 : 8;      /* reserved zeros */
  35         __u32 st      : 3;      /* subchannel type */
  36         __u32 unused2 : 18;     /* reserved zeros */
  37         __u32 mbfc    : 1;      /* measurement block format control */
  38         __u32 xmwme   : 1;      /* extended measurement word mode enable */
  39         __u32 csense  : 1;      /* concurrent sense; can be enabled ...*/
  40                                 /*  ... per MSCH, however, if facility */
  41                                 /*  ... is not installed, this results */
  42                                 /*  ... in an operand exception.       */
  43 } __attribute__ ((packed));
  44
  45 /*
  46  * subchannel information block
  47  */
  48 struct schib {
  49         struct pmcw pmcw;        /* path management control word */
  50         struct scsw scsw;        /* subchannel status word */
  51         __u64 mba;               /* measurement block address */
  52         __u8 mda[4];             /* model dependent area */
  53 } __attribute__ ((packed,aligned(4)));
  54
  55 /*
  56  * operation request block
  57  */
  58 struct orb {
  59         __u32 intparm;          /* interruption parameter */
  60         __u32 key  : 4;         /* flags, like key, suspend control, etc. */
  61         __u32 spnd : 1;         /* suspend control */
  62         __u32 res1 : 1;         /* reserved */
  63         __u32 mod  : 1;         /* modification control */
  64         __u32 sync : 1;         /* synchronize control */
  65         __u32 fmt  : 1;         /* format control */
  66         __u32 pfch : 1;         /* prefetch control */
  67         __u32 isic : 1;         /* initial-status-interruption control */
  68         __u32 alcc : 1;         /* address-limit-checking control */
  69         __u32 ssic : 1;         /* suppress-suspended-interr. control */
  70         __u32 res2 : 1;         /* reserved */
  71         __u32 c64  : 1;         /* IDAW/QDIO 64 bit control  */
  72         __u32 i2k  : 1;         /* IDAW 2/4kB block size control */
  73         __u32 lpm  : 8;         /* logical path mask */
  74         __u32 ils  : 1;         /* incorrect length */
  75         __u32 zero : 6;         /* reserved zeros */
  76         __u32 orbx : 1;         /* ORB extension control */
  77         __u32 cpa;              /* channel program address */
  78 }  __attribute__ ((packed,aligned(4)));
  79
  80 /* subchannel data structure used by I/O subroutines */
  81 struct subchannel {
  82         struct subchannel_id schid;
  83         spinlock_t *lock;       /* subchannel lock */
  84         struct mutex reg_mutex;
  85         enum {
  86                 SUBCHANNEL_TYPE_IO = 0,
  87                 SUBCHANNEL_TYPE_CHSC = 1,
  88                 SUBCHANNEL_TYPE_MESSAGE = 2,
  89                 SUBCHANNEL_TYPE_ADM = 3,
  90         } st;                   /* subchannel type */
  91
  92         struct {
  93                 unsigned int suspend:1; /* allow suspend */
  94                 unsigned int prefetch:1;/* deny prefetch */
  95                 unsigned int inter:1;   /* suppress intermediate interrupts */
  96         } __attribute__ ((packed)) options;
  97
  98         __u8 vpm;               /* verified path mask */
  99         __u8 lpm;               /* logical path mask */
 100         __u8 opm;               /* operational path mask */
 101         struct schib schib;     /* subchannel information block */
 102         struct orb orb;         /* operation request block */
 103         struct ccw1 sense_ccw;  /* static ccw for sense command */
 104         struct chsc_ssd_info ssd_info;  /* subchannel description */
 105         struct device dev;      /* entry in device tree */
 106         struct css_driver *driver;
 107 } __attribute__ ((aligned(8)));
 108
 109 #define IO_INTERRUPT_TYPE          0 /* I/O interrupt type */
 110
 111 #define to_subchannel(n) container_of(n, struct subchannel, dev)
 112
 113 extern int cio_validate_subchannel (struct subchannel *, struct subchannel_id);
 114 extern int cio_enable_subchannel (struct subchannel *, unsigned int);
 115 extern int cio_disable_subchannel (struct subchannel *);
 116 extern int cio_cancel (struct subchannel *);
 117 extern int cio_clear (struct subchannel *);
 118 extern int cio_resume (struct subchannel *);
 119 extern int cio_halt (struct subchannel *);
 120 extern int cio_start (struct subchannel *, struct ccw1 *, __u8);
 121 extern int cio_start_key (struct subchannel *, struct ccw1 *, __u8, __u8);
 122 extern int cio_cancel (struct subchannel *);
 123 extern int cio_set_options (struct subchannel *, int);
 124 extern int cio_get_options (struct subchannel *);
 125 extern int cio_modify (struct subchannel *);
 126
 127 int cio_create_sch_lock(struct subchannel *);
 128
 129 /* Use with care. */
 130 #ifdef CONFIG_CCW_CONSOLE
 131 extern struct subchannel *cio_probe_console(void);
 132 extern void cio_release_console(void);
 133 extern int cio_is_console(struct subchannel_id);
 134 extern struct subchannel *cio_get_console_subchannel(void);
 135 extern spinlock_t * cio_get_console_lock(void);
 136 #else
 137 #define cio_is_console(schid) 0
 138 #define cio_get_console_subchannel() NULL
 139 #define cio_get_console_lock() NULL;
 140 #endif
 141
 142 extern int cio_show_msg;
 143
 144 #endif