LXR linux/drivers/s390/cio/io

   1#ifndef S390_IO_SCH_H
   2#define S390_IO_SCH_H
   3
   4#include <linux/types.h>
   5#include <asm/schid.h>
   6#include <asm/ccwdev.h>
   7#include <asm/irq.h>
   8#include "css.h"
   9#include "orb.h"
  10
  11struct io_subchannel_private {
  12        union orb orb;          /* operation request block */
  13        struct ccw1 sense_ccw;  /* static ccw for sense command */
  14        struct ccw_device *cdev;/* pointer to the child ccw device */
  15        struct {
  16                unsigned int suspend:1; /* allow suspend */
  17                unsigned int prefetch:1;/* deny prefetch */
  18                unsigned int inter:1;   /* suppress intermediate interrupts */
  19        } __packed options;
  20} __aligned(8);
  21
  22#define to_io_private(n) ((struct io_subchannel_private *) \
  23                          dev_get_drvdata(&(n)->dev))
  24#define set_io_private(n, p) (dev_set_drvdata(&(n)->dev, p))
  25
  26static inline struct ccw_device *sch_get_cdev(struct subchannel *sch)
  27{
  28        struct io_subchannel_private *priv = to_io_private(sch);
  29        return priv ? priv->cdev : NULL;
  30}
  31
  32static inline void sch_set_cdev(struct subchannel *sch,
  33                                struct ccw_device *cdev)
  34{
  35        struct io_subchannel_private *priv = to_io_private(sch);
  36        if (priv)
  37                priv->cdev = cdev;
  38}
  39
  40#define MAX_CIWS 8
  41
  42/*
  43 * Possible status values for a CCW request's I/O.
  44 */
  45enum io_status {
  46        IO_DONE,
  47        IO_RUNNING,
  48        IO_STATUS_ERROR,
  49        IO_PATH_ERROR,
  50        IO_REJECTED,
  51        IO_KILLED
  52};
  53
  54/**
  55 * ccw_request - Internal CCW request.
  56 * @cp: channel program to start
  57 * @timeout: maximum allowable time in jiffies between start I/O and interrupt
  58 * @maxretries: number of retries per I/O operation and path
  59 * @lpm: mask of paths to use
  60 * @check: optional callback that determines if results are final
  61 * @filter: optional callback to adjust request status based on IRB data
  62 * @callback: final callback
  63 * @data: user-defined pointer passed to all callbacks
  64 * @singlepath: if set, use only one path from @lpm per start I/O
  65 * @cancel: non-zero if request was cancelled
  66 * @done: non-zero if request was finished
  67 * @mask: current path mask
  68 * @retries: current number of retries
  69 * @drc: delayed return code
  70 */
  71struct ccw_request {
  72        struct ccw1 *cp;
  73        unsigned long timeout;
  74        u16 maxretries;
  75        u8 lpm;
  76        int (*check)(struct ccw_device *, void *);
  77        enum io_status (*filter)(struct ccw_device *, void *, struct irb *,
  78                                 enum io_status);
  79        void (*callback)(struct ccw_device *, void *, int);
  80        void *data;
  81        unsigned int singlepath:1;
  82        /* These fields are used internally. */
  83        unsigned int cancel:1;
  84        unsigned int done:1;
  85        u16 mask;
  86        u16 retries;
  87        int drc;
  88} __attribute__((packed));
  89
  90/*
  91 * sense-id response buffer layout
  92 */
  93struct senseid {
  94        /* common part */
  95        u8  reserved;   /* always 0x'FF' */
  96        u16 cu_type;    /* control unit type */
  97        u8  cu_model;   /* control unit model */
  98        u16 dev_type;   /* device type */
  99        u8  dev_model;  /* device model */
 100        u8  unused;     /* padding byte */
 101        /* extended part */
 102        struct ciw ciw[MAX_CIWS];       /* variable # of CIWs */
 103}  __attribute__ ((packed, aligned(4)));
 104
 105enum cdev_todo {
 106        CDEV_TODO_NOTHING,
 107        CDEV_TODO_ENABLE_CMF,
 108        CDEV_TODO_REBIND,
 109        CDEV_TODO_REGISTER,
 110        CDEV_TODO_UNREG,
 111        CDEV_TODO_UNREG_EVAL,
 112};
 113
 114#define FAKE_CMD_IRB    1
 115#define FAKE_TM_IRB     2
 116
 117struct ccw_device_private {
 118        struct ccw_device *cdev;
 119        struct subchannel *sch;
 120        int state;              /* device state */
 121        atomic_t onoff;
 122        struct ccw_dev_id dev_id;       /* device id */
 123        struct subchannel_id schid;     /* subchannel number */
 124        struct ccw_request req;         /* internal I/O request */
 125        int iretry;
 126        u8 pgid_valid_mask;     /* mask of valid PGIDs */
 127        u8 pgid_todo_mask;      /* mask of PGIDs to be adjusted */
 128        u8 pgid_reset_mask;     /* mask of PGIDs which were reset */
 129        u8 path_noirq_mask;     /* mask of paths for which no irq was
 130                                   received */
 131        u8 path_notoper_mask;   /* mask of paths which were found
 132                                   not operable */
 133        u8 path_gone_mask;      /* mask of paths, that became unavailable */
 134        u8 path_new_mask;       /* mask of paths, that became available */
 135        struct {
 136                unsigned int fast:1;    /* post with "channel end" */
 137                unsigned int repall:1;  /* report every interrupt status */
 138                unsigned int pgroup:1;  /* do path grouping */
 139                unsigned int force:1;   /* allow forced online */
 140                unsigned int mpath:1;   /* do multipathing */
 141        } __attribute__ ((packed)) options;
 142        struct {
 143                unsigned int esid:1;        /* Ext. SenseID supported by HW */
 144                unsigned int dosense:1;     /* delayed SENSE required */
 145                unsigned int doverify:1;    /* delayed path verification */
 146                unsigned int donotify:1;    /* call notify function */
 147                unsigned int recog_done:1;  /* dev. recog. complete */
 148                unsigned int fake_irb:2;    /* deliver faked irb */
 149                unsigned int resuming:1;    /* recognition while resume */
 150                unsigned int pgroup:1;      /* pathgroup is set up */
 151                unsigned int mpath:1;       /* multipathing is set up */
 152                unsigned int pgid_unknown:1;/* unknown pgid state */
 153                unsigned int initialized:1; /* set if initial reference held */
 154        } __attribute__((packed)) flags;
 155        unsigned long intparm;  /* user interruption parameter */
 156        struct qdio_irq *qdio_data;
 157        struct irb irb;         /* device status */
 158        struct senseid senseid; /* SenseID info */
 159        struct pgid pgid[8];    /* path group IDs per chpid*/
 160        struct ccw1 iccws[2];   /* ccws for SNID/SID/SPGID commands */
 161        struct work_struct todo_work;
 162        enum cdev_todo todo;
 163        wait_queue_head_t wait_q;
 164        struct timer_list timer;
 165        void *cmb;                      /* measurement information */
 166        struct list_head cmb_list;      /* list of measured devices */
 167        u64 cmb_start_time;             /* clock value of cmb reset */
 168        void *cmb_wait;                 /* deferred cmb enable/disable */
 169        enum interruption_class int_class;
 170};
 171
 172static inline int rsch(struct subchannel_id schid)
 173{
 174        register struct subchannel_id reg1 asm("1") = schid;
 175        int ccode;
 176
 177        asm volatile(
 178                "       rsch\n"
 179                "       ipm     %0\n"
 180                "       srl     %0,28"
 181                : "=d" (ccode)
 182                : "d" (reg1)
 183                : "cc", "memory");
 184        return ccode;
 185}
 186
 187static inline int hsch(struct subchannel_id schid)
 188{
 189        register struct subchannel_id reg1 asm("1") = schid;
 190        int ccode;
 191
 192        asm volatile(
 193                "       hsch\n"
 194                "       ipm     %0\n"
 195                "       srl     %0,28"
 196                : "=d" (ccode)
 197                : "d" (reg1)
 198                : "cc");
 199        return ccode;
 200}
 201
 202static inline int xsch(struct subchannel_id schid)
 203{
 204        register struct subchannel_id reg1 asm("1") = schid;
 205        int ccode;
 206
 207        asm volatile(
 208                "       .insn   rre,0xb2760000,%1,0\n"
 209                "       ipm     %0\n"
 210                "       srl     %0,28"
 211                : "=d" (ccode)
 212                : "d" (reg1)
 213                : "cc");
 214        return ccode;
 215}
 216
 217#endif
 218