drivers/s390/cio/io_sch.h

   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
  10 struct 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
  25 static 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
  31 static 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  */
  44 enum 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  */
  70 struct 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  */
  92 struct 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
 104 enum 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
 113 struct 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
 162 static 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
 177 static 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
 192 static 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