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 "css.h"
   8#include "orb.h"
   9
  10struct io_subchannel_private {
  11        union orb orb;          /* operation request block */
  12        struct ccw1 sense_ccw;  /* static ccw for sense command */
  13        struct ccw_device *cdev;/* pointer to the child ccw device */
  14        struct {
  15                unsigned int suspend:1; /* allow suspend */
  16                unsigned int prefetch:1;/* deny prefetch */
  17                unsigned int inter:1;   /* suppress intermediate interrupts */
  18        } __packed options;
  19} __aligned(8);
  20
  21#define to_io_private(n) ((struct io_subchannel_private *) \
  22                          dev_get_drvdata(&(n)->dev))
  23#define set_io_private(n, p) (dev_set_drvdata(&(n)->dev, p))
  24
  25static inline struct ccw_device *sch_get_cdev(struct subchannel *sch)
  26{
  27        struct io_subchannel_private *priv = to_io_private(sch);
  28        return priv ? priv->cdev : NULL;
  29}
  30
  31static inline void sch_set_cdev(struct subchannel *sch,
  32                                struct ccw_device *cdev)
  33{
  34        struct io_subchannel_private *priv = to_io_private(sch);
  35        if (priv)
  36                priv->cdev = cdev;
  37}
  38
  39#define MAX_CIWS 8
  40
  41/*
  42 * Possible status values for a CCW request's I/O.
  43 */
  44enum io_status {
  45        IO_DONE,
  46        IO_RUNNING,
  47        IO_STATUS_ERROR,
  48        IO_PATH_ERROR,
  49        IO_REJECTED,
  50        IO_KILLED
  51};
  52
  53/**
  54 * ccw_request - Internal CCW request.
  55 * @cp: channel program to start
  56 * @timeout: maximum allowable time in jiffies between start I/O and interrupt
  57 * @maxretries: number of retries per I/O operation and path
  58 * @lpm: mask of paths to use
  59 * @check: optional callback that determines if results are final
  60 * @filter: optional callback to adjust request status based on IRB data
  61 * @callback: final callback
  62 * @data: user-defined pointer passed to all callbacks
  63 * @singlepath: if set, use only one path from @lpm per start I/O
  64 * @cancel: non-zero if request was cancelled
  65 * @done: non-zero if request was finished
  66 * @mask: current path mask
  67 * @retries: current number of retries
  68 * @drc: delayed return code
  69 */
  70struct ccw_request {
  71        struct ccw1 *cp;
  72        unsigned long timeout;
  73        u16 maxretries;
  74        u8 lpm;
  75        int (*check)(struct ccw_device *, void *);
  76        enum io_status (*filter)(struct ccw_device *, void *, struct irb *,
  77                                 enum io_status);
  78        void (*callback)(struct ccw_device *, void *, int);
  79        void *data;
  80        unsigned int singlepath:1;
  81        /* These fields are used internally. */
  82        unsigned int cancel:1;
  83        unsigned int done:1;
  84        u16 mask;
  85        u16 retries;
  86        int drc;
  87} __attribute__((packed));
  88
  89/*
  90 * sense-id response buffer layout
  91 */
  92struct senseid {
  93        /* common part */
  94        u8  reserved;   /* always 0x'FF' */
  95        u16 cu_type;    /* control unit type */
  96        u8  cu_model;   /* control unit model */
  97        u16 dev_type;   /* device type */
  98        u8  dev_model;  /* device model */
  99        u8  unused;     /* padding byte */
 100        /* extended part */
 101        struct ciw ciw[MAX_CIWS];       /* variable # of CIWs */
 102}  __attribute__ ((packed, aligned(4)));
 103
 104enum cdev_todo {
 105        CDEV_TODO_NOTHING,
 106        CDEV_TODO_ENABLE_CMF,
 107        CDEV_TODO_REBIND,
 108        CDEV_TODO_REGISTER,
 109        CDEV_TODO_UNREG,
 110        CDEV_TODO_UNREG_EVAL,
 111};
 112
 113struct ccw_device_private {
 114        struct ccw_device *cdev;
 115        struct subchannel *sch;
 116        int state;              /* device state */
 117        atomic_t onoff;
 118        struct ccw_dev_id dev_id;       /* device id */
 119        struct subchannel_id schid;     /* subchannel number */
 120        struct ccw_request req;         /* internal I/O request */
 121        int iretry;
 122        u8 pgid_valid_mask;     /* mask of valid PGIDs */
 123        u8 pgid_todo_mask;      /* mask of PGIDs to be adjusted */
 124        u8 pgid_reset_mask;     /* mask of PGIDs which were reset */
 125        u8 path_gone_mask;      /* mask of paths, that became unavailable */
 126        u8 path_new_mask;       /* mask of paths, that became available */
 127        struct {
 128                unsigned int fast:1;    /* post with "channel end" */
 129                unsigned int repall:1;  /* report every interrupt status */
 130                unsigned int pgroup:1;  /* do path grouping */
 131                unsigned int force:1;   /* allow forced online */
 132                unsigned int mpath:1;   /* do multipathing */
 133        } __attribute__ ((packed)) options;
 134        struct {
 135                unsigned int esid:1;        /* Ext. SenseID supported by HW */
 136                unsigned int dosense:1;     /* delayed SENSE required */
 137                unsigned int doverify:1;    /* delayed path verification */
 138                unsigned int donotify:1;    /* call notify function */
 139                unsigned int recog_done:1;  /* dev. recog. complete */
 140                unsigned int fake_irb:1;    /* deliver faked irb */
 141                unsigned int resuming:1;    /* recognition while resume */
 142                unsigned int pgroup:1;      /* pathgroup is set up */
 143                unsigned int mpath:1;       /* multipathing is set up */
 144                unsigned int initialized:1; /* set if initial reference held */
 145        } __attribute__((packed)) flags;
 146        unsigned long intparm;  /* user interruption parameter */
 147        struct qdio_irq *qdio_data;
 148        struct irb irb;         /* device status */
 149        struct senseid senseid; /* SenseID info */
 150        struct pgid pgid[8];    /* path group IDs per chpid*/
 151        struct ccw1 iccws[2];   /* ccws for SNID/SID/SPGID commands */
 152        struct work_struct todo_work;
 153        enum cdev_todo todo;
 154        wait_queue_head_t wait_q;
 155        struct timer_list timer;
 156        void *cmb;                      /* measurement information */
 157        struct list_head cmb_list;      /* list of measured devices */
 158        u64 cmb_start_time;             /* clock value of cmb reset */
 159        void *cmb_wait;                 /* deferred cmb enable/disable */
 160};
 161
 162static inline int rsch(struct subchannel_id schid)
 163{
 164        register struct subchannel_id reg1 asm("1") = schid;
 165        int ccode;
 166
 167        asm volatile(
 168                "       rsch\n"
 169                "       ipm     %0\n"
 170                "       srl     %0,28"
 171                : "=d" (ccode)
 172                : "d" (reg1)
 173                : "cc", "memory");
 174        return ccode;
 175}
 176
 177static inline int hsch(struct subchannel_id schid)
 178{
 179        register struct subchannel_id reg1 asm("1") = schid;
 180        int ccode;
 181
 182        asm volatile(
 183                "       hsch\n"
 184                "       ipm     %0\n"
 185                "       srl     %0,28"
 186                : "=d" (ccode)
 187                : "d" (reg1)
 188                : "cc");
 189        return ccode;
 190}
 191
 192static inline int xsch(struct subchannel_id schid)
 193{
 194        register struct subchannel_id reg1 asm("1") = schid;
 195        int ccode;
 196
 197        asm volatile(
 198                "       .insn   rre,0xb2760000,%1,0\n"
 199                "       ipm     %0\n"
 200                "       srl     %0,28"
 201                : "=d" (ccode)
 202                : "d" (reg1)
 203                : "cc");
 204        return ccode;
 205}
 206
 207#endif
 208