drivers/s390/cio/device_fsm.c

   1 /*
   2  * drivers/s390/cio/device_fsm.c
   3  * finite state machine for device handling
   4  *
   5  *    Copyright IBM Corp. 2002,2008
   6  *    Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
   7  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/jiffies.h>
  13 #include <linux/string.h>
  14
  15 #include <asm/ccwdev.h>
  16 #include <asm/cio.h>
  17 #include <asm/chpid.h>
  18
  19 #include "cio.h"
  20 #include "cio_debug.h"
  21 #include "css.h"
  22 #include "device.h"
  23 #include "chsc.h"
  24 #include "ioasm.h"
  25 #include "chp.h"
  26
  27 static int timeout_log_enabled;
  28
  29 static int __init ccw_timeout_log_setup(char *unused)
  30 {
  31         timeout_log_enabled = 1;
  32         return 1;
  33 }
  34
  35 __setup("ccw_timeout_log", ccw_timeout_log_setup);
  36
  37 static void ccw_timeout_log(struct ccw_device *cdev)
  38 {
  39         struct schib schib;
  40         struct subchannel *sch;
  41         struct io_subchannel_private *private;
  42         union orb *orb;
  43         int cc;
  44
  45         sch = to_subchannel(cdev->dev.parent);
  46         private = to_io_private(sch);
  47         orb = &private->orb;
  48         cc = stsch(sch->schid, &schib);
  49
  50         printk(KERN_WARNING "cio: ccw device timeout occurred at %llx, "
  51                "device information:\n", get_clock());
  52         printk(KERN_WARNING "cio: orb:\n");
  53         print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
  54                        orb, sizeof(*orb), 0);
  55         printk(KERN_WARNING "cio: ccw device bus id: %s\n", cdev->dev.bus_id);
  56         printk(KERN_WARNING "cio: subchannel bus id: %s\n", sch->dev.bus_id);
  57         printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, "
  58                "vpm: %02x\n", sch->lpm, sch->opm, sch->vpm);
  59
  60         if (orb->tm.b) {
  61                 printk(KERN_WARNING "cio: orb indicates transport mode\n");
  62                 printk(KERN_WARNING "cio: last tcw:\n");
  63                 print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
  64                                (void *)(addr_t)orb->tm.tcw,
  65                                sizeof(struct tcw), 0);
  66         } else {
  67                 printk(KERN_WARNING "cio: orb indicates command mode\n");
  68                 if ((void *)(addr_t)orb->cmd.cpa == &private->sense_ccw ||
  69                     (void *)(addr_t)orb->cmd.cpa == cdev->private->iccws)
  70                         printk(KERN_WARNING "cio: last channel program "
  71                                "(intern):\n");
  72                 else
  73                         printk(KERN_WARNING "cio: last channel program:\n");
  74
  75                 print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
  76                                (void *)(addr_t)orb->cmd.cpa,
  77                                sizeof(struct ccw1), 0);
  78         }
  79         printk(KERN_WARNING "cio: ccw device state: %d\n",
  80                cdev->private->state);
  81         printk(KERN_WARNING "cio: store subchannel returned: cc=%d\n", cc);
  82         printk(KERN_WARNING "cio: schib:\n");
  83         print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
  84                        &schib, sizeof(schib), 0);
  85         printk(KERN_WARNING "cio: ccw device flags:\n");
  86         print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
  87                        &cdev->private->flags, sizeof(cdev->private->flags), 0);
  88 }
  89
  90 /*
  91  * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
  92  */
  93 static void
  94 ccw_device_timeout(unsigned long data)
  95 {
  96         struct ccw_device *cdev;
  97
  98         cdev = (struct ccw_device *) data;
  99         spin_lock_irq(cdev->ccwlock);
 100         if (timeout_log_enabled)
 101                 ccw_timeout_log(cdev);
 102         dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
 103         spin_unlock_irq(cdev->ccwlock);
 104 }
 105
 106 /*
 107  * Set timeout
 108  */
 109 void
 110 ccw_device_set_timeout(struct ccw_device *cdev, int expires)
 111 {
 112         if (expires == 0) {
 113                 del_timer(&cdev->private->timer);
 114                 return;
 115         }
 116         if (timer_pending(&cdev->private->timer)) {
 117                 if (mod_timer(&cdev->private->timer, jiffies + expires))
 118                         return;
 119         }
 120         cdev->private->timer.function = ccw_device_timeout;
 121         cdev->private->timer.data = (unsigned long) cdev;
 122         cdev->private->timer.expires = jiffies + expires;
 123         add_timer(&cdev->private->timer);
 124 }
 125
 126 /*
 127  * Cancel running i/o. This is called repeatedly since halt/clear are
 128  * asynchronous operations. We do one try with cio_cancel, two tries
 129  * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
 130  * Returns 0 if device now idle, -ENODEV for device not operational and
 131  * -EBUSY if an interrupt is expected (either from halt/clear or from a
 132  * status pending).
 133  */
 134 int
 135 ccw_device_cancel_halt_clear(struct ccw_device *cdev)
 136 {
 137         struct subchannel *sch;
 138         int ret;
 139
 140         sch = to_subchannel(cdev->dev.parent);
 141         ret = stsch(sch->schid, &sch->schib);
 142         if (ret || !sch->schib.pmcw.dnv)
 143                 return -ENODEV;
 144         if (!sch->schib.pmcw.ena)
 145                 /* Not operational -> done. */
 146                 return 0;
 147         /* Stage 1: cancel io. */
 148         if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) &&
 149             !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
 150                 if (!scsw_is_tm(&sch->schib.scsw)) {
 151                         ret = cio_cancel(sch);
 152                         if (ret != -EINVAL)
 153                                 return ret;
 154                 }
 155                 /* cancel io unsuccessful or not applicable (transport mode).
 156                  * Continue with asynchronous instructions. */
 157                 cdev->private->iretry = 3;      /* 3 halt retries. */
 158         }
 159         if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
 160                 /* Stage 2: halt io. */
 161                 if (cdev->private->iretry) {
 162                         cdev->private->iretry--;
 163                         ret = cio_halt(sch);
 164                         if (ret != -EBUSY)
 165                                 return (ret == 0) ? -EBUSY : ret;
 166                 }
 167                 /* halt io unsuccessful. */
 168                 cdev->private->iretry = 255;    /* 255 clear retries. */
 169         }
 170         /* Stage 3: clear io. */
 171         if (cdev->private->iretry) {
 172                 cdev->private->iretry--;
 173                 ret = cio_clear (sch);
 174                 return (ret == 0) ? -EBUSY : ret;
 175         }
 176         panic("Can't stop i/o on subchannel.\n");
 177 }
 178
 179 static int
 180 ccw_device_handle_oper(struct ccw_device *cdev)
 181 {
 182         struct subchannel *sch;
 183
 184         sch = to_subchannel(cdev->dev.parent);
 185         cdev->private->flags.recog_done = 1;
 186         /*
 187          * Check if cu type and device type still match. If
 188          * not, it is certainly another device and we have to
 189          * de- and re-register.
 190          */
 191         if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
 192             cdev->id.cu_model != cdev->private->senseid.cu_model ||
 193             cdev->id.dev_type != cdev->private->senseid.dev_type ||
 194             cdev->id.dev_model != cdev->private->senseid.dev_model) {
 195                 PREPARE_WORK(&cdev->private->kick_work,
 196                              ccw_device_do_unreg_rereg);
 197                 queue_work(ccw_device_work, &cdev->private->kick_work);
 198                 return 0;
 199         }
 200         cdev->private->flags.donotify = 1;
 201         return 1;
 202 }
 203
 204 /*
 205  * The machine won't give us any notification by machine check if a chpid has
 206  * been varied online on the SE so we have to find out by magic (i. e. driving
 207  * the channel subsystem to device selection and updating our path masks).
 208  */
 209 static void
 210 __recover_lost_chpids(struct subchannel *sch, int old_lpm)
 211 {
 212         int mask, i;
 213         struct chp_id chpid;
 214
 215         chp_id_init(&chpid);
 216         for (i = 0; i<8; i++) {
 217                 mask = 0x80 >> i;
 218                 if (!(sch->lpm & mask))
 219                         continue;
 220                 if (old_lpm & mask)
 221                         continue;
 222                 chpid.id = sch->schib.pmcw.chpid[i];
 223                 if (!chp_is_registered(chpid))
 224                         css_schedule_eval_all();
 225         }
 226 }
 227
 228 /*
 229  * Stop device recognition.
 230  */
 231 static void
 232 ccw_device_recog_done(struct ccw_device *cdev, int state)
 233 {
 234         struct subchannel *sch;
 235         int notify, old_lpm, same_dev;
 236
 237         sch = to_subchannel(cdev->dev.parent);
 238
 239         ccw_device_set_timeout(cdev, 0);
 240         cio_disable_subchannel(sch);
 241         /*
 242          * Now that we tried recognition, we have performed device selection
 243          * through ssch() and the path information is up to date.
 244          */
 245         old_lpm = sch->lpm;
 246         stsch(sch->schid, &sch->schib);
 247         sch->lpm = sch->schib.pmcw.pam & sch->opm;
 248         /* Check since device may again have become not operational. */
 249         if (!sch->schib.pmcw.dnv)
 250                 state = DEV_STATE_NOT_OPER;
 251         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
 252                 /* Force reprobe on all chpids. */
 253                 old_lpm = 0;
 254         if (sch->lpm != old_lpm)
 255                 __recover_lost_chpids(sch, old_lpm);
 256         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 257                 if (state == DEV_STATE_NOT_OPER) {
 258                         cdev->private->flags.recog_done = 1;
 259                         cdev->private->state = DEV_STATE_DISCONNECTED;
 260                         return;
 261                 }
 262                 /* Boxed devices don't need extra treatment. */
 263         }
 264         notify = 0;
 265         same_dev = 0; /* Keep the compiler quiet... */
 266         switch (state) {
 267         case DEV_STATE_NOT_OPER:
 268                 CIO_MSG_EVENT(2, "SenseID : unknown device %04x on "
 269                               "subchannel 0.%x.%04x\n",
 270                               cdev->private->dev_id.devno,
 271                               sch->schid.ssid, sch->schid.sch_no);
 272                 break;
 273         case DEV_STATE_OFFLINE:
 274                 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 275                         same_dev = ccw_device_handle_oper(cdev);
 276                         notify = 1;
 277                 }
 278                 /* fill out sense information */
 279                 memset(&cdev->id, 0, sizeof(cdev->id));
 280                 cdev->id.cu_type   = cdev->private->senseid.cu_type;
 281                 cdev->id.cu_model  = cdev->private->senseid.cu_model;
 282                 cdev->id.dev_type  = cdev->private->senseid.dev_type;
 283                 cdev->id.dev_model = cdev->private->senseid.dev_model;
 284                 if (notify) {
 285                         cdev->private->state = DEV_STATE_OFFLINE;
 286                         if (same_dev) {
 287                                 /* Get device online again. */
 288                                 ccw_device_online(cdev);
 289                                 wake_up(&cdev->private->wait_q);
 290                         }
 291                         return;
 292                 }
 293                 /* Issue device info message. */
 294                 CIO_MSG_EVENT(4, "SenseID : device 0.%x.%04x reports: "
 295                               "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
 296                               "%04X/%02X\n",
 297                               cdev->private->dev_id.ssid,
 298                               cdev->private->dev_id.devno,
 299                               cdev->id.cu_type, cdev->id.cu_model,
 300                               cdev->id.dev_type, cdev->id.dev_model);
 301                 break;
 302         case DEV_STATE_BOXED:
 303                 CIO_MSG_EVENT(0, "SenseID : boxed device %04x on "
 304                               " subchannel 0.%x.%04x\n",
 305                               cdev->private->dev_id.devno,
 306                               sch->schid.ssid, sch->schid.sch_no);
 307                 break;
 308         }
 309         cdev->private->state = state;
 310         io_subchannel_recog_done(cdev);
 311         if (state != DEV_STATE_NOT_OPER)
 312                 wake_up(&cdev->private->wait_q);
 313 }
 314
 315 /*
 316  * Function called from device_id.c after sense id has completed.
 317  */
 318 void
 319 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
 320 {
 321         switch (err) {
 322         case 0:
 323                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
 324                 break;
 325         case -ETIME:            /* Sense id stopped by timeout. */
 326                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 327                 break;
 328         default:
 329                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 330                 break;
 331         }
 332 }
 333
 334 int ccw_device_notify(struct ccw_device *cdev, int event)
 335 {
 336         if (!cdev->drv)
 337                 return 0;
 338         if (!cdev->online)
 339                 return 0;
 340         return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0;
 341 }
 342
 343 static void
 344 ccw_device_oper_notify(struct work_struct *work)
 345 {
 346         struct ccw_device_private *priv;
 347         struct ccw_device *cdev;
 348         int ret;
 349
 350         priv = container_of(work, struct ccw_device_private, kick_work);
 351         cdev = priv->cdev;
 352         ret = ccw_device_notify(cdev, CIO_OPER);
 353         if (ret) {
 354                 /* Reenable channel measurements, if needed. */
 355                 cmf_reenable(cdev);
 356                 wake_up(&cdev->private->wait_q);
 357         } else
 358                 /* Driver doesn't want device back. */
 359                 ccw_device_do_unreg_rereg(work);
 360 }
 361
 362 /*
 363  * Finished with online/offline processing.
 364  */
 365 static void
 366 ccw_device_done(struct ccw_device *cdev, int state)
 367 {
 368         struct subchannel *sch;
 369
 370         sch = to_subchannel(cdev->dev.parent);
 371
 372         ccw_device_set_timeout(cdev, 0);
 373
 374         if (state != DEV_STATE_ONLINE)
 375                 cio_disable_subchannel(sch);
 376
 377         /* Reset device status. */
 378         memset(&cdev->private->irb, 0, sizeof(struct irb));
 379
 380         cdev->private->state = state;
 381
 382
 383         if (state == DEV_STATE_BOXED)
 384                 CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n",
 385                               cdev->private->dev_id.devno, sch->schid.sch_no);
 386
 387         if (cdev->private->flags.donotify) {
 388                 cdev->private->flags.donotify = 0;
 389                 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify);
 390                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 391         }
 392         wake_up(&cdev->private->wait_q);
 393
 394         if (css_init_done && state != DEV_STATE_ONLINE)
 395                 put_device (&cdev->dev);
 396 }
 397
 398 static int cmp_pgid(struct pgid *p1, struct pgid *p2)
 399 {
 400         char *c1;
 401         char *c2;
 402
 403         c1 = (char *)p1;
 404         c2 = (char *)p2;
 405
 406         return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
 407 }
 408
 409 static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
 410 {
 411         int i;
 412         int last;
 413
 414         last = 0;
 415         for (i = 0; i < 8; i++) {
 416                 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
 417                         /* No PGID yet */
 418                         continue;
 419                 if (cdev->private->pgid[last].inf.ps.state1 ==
 420                     SNID_STATE1_RESET) {
 421                         /* First non-zero PGID */
 422                         last = i;
 423                         continue;
 424                 }
 425                 if (cmp_pgid(&cdev->private->pgid[i],
 426                              &cdev->private->pgid[last]) == 0)
 427                         /* Non-conflicting PGIDs */
 428                         continue;
 429
 430                 /* PGID mismatch, can't pathgroup. */
 431                 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
 432                               "0.%x.%04x, can't pathgroup\n",
 433                               cdev->private->dev_id.ssid,
 434                               cdev->private->dev_id.devno);
 435                 cdev->private->options.pgroup = 0;
 436                 return;
 437         }
 438         if (cdev->private->pgid[last].inf.ps.state1 ==
 439             SNID_STATE1_RESET)
 440                 /* No previous pgid found */
 441                 memcpy(&cdev->private->pgid[0],
 442                        &channel_subsystems[0]->global_pgid,
 443                        sizeof(struct pgid));
 444         else
 445                 /* Use existing pgid */
 446                 memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
 447                        sizeof(struct pgid));
 448 }
 449
 450 /*
 451  * Function called from device_pgid.c after sense path ground has completed.
 452  */
 453 void
 454 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
 455 {
 456         struct subchannel *sch;
 457
 458         sch = to_subchannel(cdev->dev.parent);
 459         switch (err) {
 460         case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
 461                 cdev->private->options.pgroup = 0;
 462                 break;
 463         case 0: /* success */
 464         case -EACCES: /* partial success, some paths not operational */
 465                 /* Check if all pgids are equal or 0. */
 466                 __ccw_device_get_common_pgid(cdev);
 467                 break;
 468         case -ETIME:            /* Sense path group id stopped by timeout. */
 469         case -EUSERS:           /* device is reserved for someone else. */
 470                 ccw_device_done(cdev, DEV_STATE_BOXED);
 471                 return;
 472         default:
 473                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 474                 return;
 475         }
 476         /* Start Path Group verification. */
 477         cdev->private->state = DEV_STATE_VERIFY;
 478         cdev->private->flags.doverify = 0;
 479         ccw_device_verify_start(cdev);
 480 }
 481
 482 /*
 483  * Start device recognition.
 484  */
 485 int
 486 ccw_device_recognition(struct ccw_device *cdev)
 487 {
 488         struct subchannel *sch;
 489         int ret;
 490
 491         if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
 492             (cdev->private->state != DEV_STATE_BOXED))
 493                 return -EINVAL;
 494         sch = to_subchannel(cdev->dev.parent);
 495         ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
 496         if (ret != 0)
 497                 /* Couldn't enable the subchannel for i/o. Sick device. */
 498                 return ret;
 499
 500         /* After 60s the device recognition is considered to have failed. */
 501         ccw_device_set_timeout(cdev, 60*HZ);
 502
 503         /*
 504          * We used to start here with a sense pgid to find out whether a device
 505          * is locked by someone else. Unfortunately, the sense pgid command
 506          * code has other meanings on devices predating the path grouping
 507          * algorithm, so we start with sense id and box the device after an
 508          * timeout (or if sense pgid during path verification detects the device
 509          * is locked, as may happen on newer devices).
 510          */
 511         cdev->private->flags.recog_done = 0;
 512         cdev->private->state = DEV_STATE_SENSE_ID;
 513         ccw_device_sense_id_start(cdev);
 514         return 0;
 515 }
 516
 517 /*
 518  * Handle timeout in device recognition.
 519  */
 520 static void
 521 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 522 {
 523         int ret;
 524
 525         ret = ccw_device_cancel_halt_clear(cdev);
 526         switch (ret) {
 527         case 0:
 528                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 529                 break;
 530         case -ENODEV:
 531                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 532                 break;
 533         default:
 534                 ccw_device_set_timeout(cdev, 3*HZ);
 535         }
 536 }
 537
 538
 539 void
 540 ccw_device_verify_done(struct ccw_device *cdev, int err)
 541 {
 542         struct subchannel *sch;
 543
 544         sch = to_subchannel(cdev->dev.parent);
 545         /* Update schib - pom may have changed. */
 546         stsch(sch->schid, &sch->schib);
 547         /* Update lpm with verified path mask. */
 548         sch->lpm = sch->vpm;
 549         /* Repeat path verification? */
 550         if (cdev->private->flags.doverify) {
 551                 cdev->private->flags.doverify = 0;
 552                 ccw_device_verify_start(cdev);
 553                 return;
 554         }
 555         switch (err) {
 556         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 557                 cdev->private->options.pgroup = 0;
 558         case 0:
 559                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 560                 /* Deliver fake irb to device driver, if needed. */
 561                 if (cdev->private->flags.fake_irb) {
 562                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 563                         cdev->private->irb.scsw.cmd.cc = 1;
 564                         cdev->private->irb.scsw.cmd.fctl = SCSW_FCTL_START_FUNC;
 565                         cdev->private->irb.scsw.cmd.actl = SCSW_ACTL_START_PEND;
 566                         cdev->private->irb.scsw.cmd.stctl =
 567                                 SCSW_STCTL_STATUS_PEND;
 568                         cdev->private->flags.fake_irb = 0;
 569                         if (cdev->handler)
 570                                 cdev->handler(cdev, cdev->private->intparm,
 571                                               &cdev->private->irb);
 572                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 573                 }
 574                 break;
 575         case -ETIME:
 576                 /* Reset oper notify indication after verify error. */
 577                 cdev->private->flags.donotify = 0;
 578                 ccw_device_done(cdev, DEV_STATE_BOXED);
 579                 break;
 580         default:
 581                 /* Reset oper notify indication after verify error. */
 582                 cdev->private->flags.donotify = 0;
 583                 if (cdev->online) {
 584                         ccw_device_set_timeout(cdev, 0);
 585                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 586                 } else
 587                         ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 588                 break;
 589         }
 590 }
 591
 592 /*
 593  * Get device online.
 594  */
 595 int
 596 ccw_device_online(struct ccw_device *cdev)
 597 {
 598         struct subchannel *sch;
 599         int ret;
 600
 601         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 602             (cdev->private->state != DEV_STATE_BOXED))
 603                 return -EINVAL;
 604         sch = to_subchannel(cdev->dev.parent);
 605         if (css_init_done && !get_device(&cdev->dev))
 606                 return -ENODEV;
 607         ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
 608         if (ret != 0) {
 609                 /* Couldn't enable the subchannel for i/o. Sick device. */
 610                 if (ret == -ENODEV)
 611                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 612                 return ret;
 613         }
 614         /* Do we want to do path grouping? */
 615         if (!cdev->private->options.pgroup) {
 616                 /* Start initial path verification. */
 617                 cdev->private->state = DEV_STATE_VERIFY;
 618                 cdev->private->flags.doverify = 0;
 619                 ccw_device_verify_start(cdev);
 620                 return 0;
 621         }
 622         /* Do a SensePGID first. */
 623         cdev->private->state = DEV_STATE_SENSE_PGID;
 624         ccw_device_sense_pgid_start(cdev);
 625         return 0;
 626 }
 627
 628 void
 629 ccw_device_disband_done(struct ccw_device *cdev, int err)
 630 {
 631         switch (err) {
 632         case 0:
 633                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 634                 break;
 635         case -ETIME:
 636                 ccw_device_done(cdev, DEV_STATE_BOXED);
 637                 break;
 638         default:
 639                 cdev->private->flags.donotify = 0;
 640                 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 641                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 642                 break;
 643         }
 644 }
 645
 646 /*
 647  * Shutdown device.
 648  */
 649 int
 650 ccw_device_offline(struct ccw_device *cdev)
 651 {
 652         struct subchannel *sch;
 653
 654         if (ccw_device_is_orphan(cdev)) {
 655                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 656                 return 0;
 657         }
 658         sch = to_subchannel(cdev->dev.parent);
 659         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
 660                 return -ENODEV;
 661         if (scsw_actl(&sch->schib.scsw) != 0)
 662                 return -EBUSY;
 663         if (cdev->private->state != DEV_STATE_ONLINE)
 664                 return -EINVAL;
 665         /* Are we doing path grouping? */
 666         if (!cdev->private->options.pgroup) {
 667                 /* No, set state offline immediately. */
 668                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 669                 return 0;
 670         }
 671         /* Start Set Path Group commands. */
 672         cdev->private->state = DEV_STATE_DISBAND_PGID;
 673         ccw_device_disband_start(cdev);
 674         return 0;
 675 }
 676
 677 /*
 678  * Handle timeout in device online/offline process.
 679  */
 680 static void
 681 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 682 {
 683         int ret;
 684
 685         ret = ccw_device_cancel_halt_clear(cdev);
 686         switch (ret) {
 687         case 0:
 688                 ccw_device_done(cdev, DEV_STATE_BOXED);
 689                 break;
 690         case -ENODEV:
 691                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 692                 break;
 693         default:
 694                 ccw_device_set_timeout(cdev, 3*HZ);
 695         }
 696 }
 697
 698 /*
 699  * Handle not oper event in device recognition.
 700  */
 701 static void
 702 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 703 {
 704         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 705 }
 706
 707 /*
 708  * Handle not operational event in non-special state.
 709  */
 710 static void ccw_device_generic_notoper(struct ccw_device *cdev,
 711                                        enum dev_event dev_event)
 712 {
 713         struct subchannel *sch;
 714
 715         cdev->private->state = DEV_STATE_NOT_OPER;
 716         sch = to_subchannel(cdev->dev.parent);
 717         css_schedule_eval(sch->schid);
 718 }
 719
 720 /*
 721  * Handle path verification event.
 722  */
 723 static void
 724 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 725 {
 726         struct subchannel *sch;
 727
 728         if (cdev->private->state == DEV_STATE_W4SENSE) {
 729                 cdev->private->flags.doverify = 1;
 730                 return;
 731         }
 732         sch = to_subchannel(cdev->dev.parent);
 733         /*
 734          * Since we might not just be coming from an interrupt from the
 735          * subchannel we have to update the schib.
 736          */
 737         stsch(sch->schid, &sch->schib);
 738
 739         if (scsw_actl(&sch->schib.scsw) != 0 ||
 740             (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) ||
 741             (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) {
 742                 /*
 743                  * No final status yet or final status not yet delivered
 744                  * to the device driver. Can't do path verfication now,
 745                  * delay until final status was delivered.
 746                  */
 747                 cdev->private->flags.doverify = 1;
 748                 return;
 749         }
 750         /* Device is idle, we can do the path verification. */
 751         cdev->private->state = DEV_STATE_VERIFY;
 752         cdev->private->flags.doverify = 0;
 753         ccw_device_verify_start(cdev);
 754 }
 755
 756 /*
 757  * Got an interrupt for a normal io (state online).
 758  */
 759 static void
 760 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 761 {
 762         struct irb *irb;
 763         int is_cmd;
 764
 765         irb = (struct irb *) __LC_IRB;
 766         is_cmd = !scsw_is_tm(&irb->scsw);
 767         /* Check for unsolicited interrupt. */
 768         if (!scsw_is_solicited(&irb->scsw)) {
 769                 if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
 770                     !irb->esw.esw0.erw.cons) {
 771                         /* Unit check but no sense data. Need basic sense. */
 772                         if (ccw_device_do_sense(cdev, irb) != 0)
 773                                 goto call_handler_unsol;
 774                         memcpy(&cdev->private->irb, irb, sizeof(struct irb));
 775                         cdev->private->state = DEV_STATE_W4SENSE;
 776                         cdev->private->intparm = 0;
 777                         return;
 778                 }
 779 call_handler_unsol:
 780                 if (cdev->handler)
 781                         cdev->handler (cdev, 0, irb);
 782                 if (cdev->private->flags.doverify)
 783                         ccw_device_online_verify(cdev, 0);
 784                 return;
 785         }
 786         /* Accumulate status and find out if a basic sense is needed. */
 787         ccw_device_accumulate_irb(cdev, irb);
 788         if (is_cmd && cdev->private->flags.dosense) {
 789                 if (ccw_device_do_sense(cdev, irb) == 0) {
 790                         cdev->private->state = DEV_STATE_W4SENSE;
 791                 }
 792                 return;
 793         }
 794         /* Call the handler. */
 795         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 796                 /* Start delayed path verification. */
 797                 ccw_device_online_verify(cdev, 0);
 798 }
 799
 800 /*
 801  * Got an timeout in online state.
 802  */
 803 static void
 804 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 805 {
 806         int ret;
 807
 808         ccw_device_set_timeout(cdev, 0);
 809         ret = ccw_device_cancel_halt_clear(cdev);
 810         if (ret == -EBUSY) {
 811                 ccw_device_set_timeout(cdev, 3*HZ);
 812                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 813                 return;
 814         }
 815         if (ret == -ENODEV)
 816                 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 817         else if (cdev->handler)
 818                 cdev->handler(cdev, cdev->private->intparm,
 819                               ERR_PTR(-ETIMEDOUT));
 820 }
 821
 822 /*
 823  * Got an interrupt for a basic sense.
 824  */
 825 static void
 826 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 827 {
 828         struct irb *irb;
 829
 830         irb = (struct irb *) __LC_IRB;
 831         /* Check for unsolicited interrupt. */
 832         if (scsw_stctl(&irb->scsw) ==
 833             (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 834                 if (scsw_cc(&irb->scsw) == 1)
 835                         /* Basic sense hasn't started. Try again. */
 836                         ccw_device_do_sense(cdev, irb);
 837                 else {
 838                         CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited "
 839                                       "interrupt during w4sense...\n",
 840                                       cdev->private->dev_id.ssid,
 841                                       cdev->private->dev_id.devno);
 842                         if (cdev->handler)
 843                                 cdev->handler (cdev, 0, irb);
 844                 }
 845                 return;
 846         }
 847         /*
 848          * Check if a halt or clear has been issued in the meanwhile. If yes,
 849          * only deliver the halt/clear interrupt to the device driver as if it
 850          * had killed the original request.
 851          */
 852         if (scsw_fctl(&irb->scsw) &
 853             (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
 854                 /* Retry Basic Sense if requested. */
 855                 if (cdev->private->flags.intretry) {
 856                         cdev->private->flags.intretry = 0;
 857                         ccw_device_do_sense(cdev, irb);
 858                         return;
 859                 }
 860                 cdev->private->flags.dosense = 0;
 861                 memset(&cdev->private->irb, 0, sizeof(struct irb));
 862                 ccw_device_accumulate_irb(cdev, irb);
 863                 goto call_handler;
 864         }
 865         /* Add basic sense info to irb. */
 866         ccw_device_accumulate_basic_sense(cdev, irb);
 867         if (cdev->private->flags.dosense) {
 868                 /* Another basic sense is needed. */
 869                 ccw_device_do_sense(cdev, irb);
 870                 return;
 871         }
 872 call_handler:
 873         cdev->private->state = DEV_STATE_ONLINE;
 874         /* Call the handler. */
 875         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 876                 /* Start delayed path verification. */
 877                 ccw_device_online_verify(cdev, 0);
 878 }
 879
 880 static void
 881 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 882 {
 883         struct irb *irb;
 884
 885         irb = (struct irb *) __LC_IRB;
 886         /* Accumulate status. We don't do basic sense. */
 887         ccw_device_accumulate_irb(cdev, irb);
 888         /* Remember to clear irb to avoid residuals. */
 889         memset(&cdev->private->irb, 0, sizeof(struct irb));
 890         /* Try to start delayed device verification. */
 891         ccw_device_online_verify(cdev, 0);
 892         /* Note: Don't call handler for cio initiated clear! */
 893 }
 894
 895 static void
 896 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
 897 {
 898         struct subchannel *sch;
 899
 900         sch = to_subchannel(cdev->dev.parent);
 901         ccw_device_set_timeout(cdev, 0);
 902         /* Start delayed path verification. */
 903         ccw_device_online_verify(cdev, 0);
 904         /* OK, i/o is dead now. Call interrupt handler. */
 905         if (cdev->handler)
 906                 cdev->handler(cdev, cdev->private->intparm,
 907                               ERR_PTR(-EIO));
 908 }
 909
 910 static void
 911 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 912 {
 913         int ret;
 914
 915         ret = ccw_device_cancel_halt_clear(cdev);
 916         if (ret == -EBUSY) {
 917                 ccw_device_set_timeout(cdev, 3*HZ);
 918                 return;
 919         }
 920         /* Start delayed path verification. */
 921         ccw_device_online_verify(cdev, 0);
 922         if (cdev->handler)
 923                 cdev->handler(cdev, cdev->private->intparm,
 924                               ERR_PTR(-EIO));
 925 }
 926
 927 void ccw_device_kill_io(struct ccw_device *cdev)
 928 {
 929         int ret;
 930
 931         ret = ccw_device_cancel_halt_clear(cdev);
 932         if (ret == -EBUSY) {
 933                 ccw_device_set_timeout(cdev, 3*HZ);
 934                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 935                 return;
 936         }
 937         /* Start delayed path verification. */
 938         ccw_device_online_verify(cdev, 0);
 939         if (cdev->handler)
 940                 cdev->handler(cdev, cdev->private->intparm,
 941                               ERR_PTR(-EIO));
 942 }
 943
 944 static void
 945 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
 946 {
 947         /* Start verification after current task finished. */
 948         cdev->private->flags.doverify = 1;
 949 }
 950
 951 static void
 952 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
 953 {
 954         struct irb *irb;
 955
 956         switch (dev_event) {
 957         case DEV_EVENT_INTERRUPT:
 958                 irb = (struct irb *) __LC_IRB;
 959                 /* Check for unsolicited interrupt. */
 960                 if ((scsw_stctl(&irb->scsw) ==
 961                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
 962                     (!scsw_cc(&irb->scsw)))
 963                         /* FIXME: we should restart stlck here, but this
 964                          * is extremely unlikely ... */
 965                         goto out_wakeup;
 966
 967                 ccw_device_accumulate_irb(cdev, irb);
 968                 /* We don't care about basic sense etc. */
 969                 break;
 970         default: /* timeout */
 971                 break;
 972         }
 973 out_wakeup:
 974         wake_up(&cdev->private->wait_q);
 975 }
 976
 977 static void
 978 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
 979 {
 980         struct subchannel *sch;
 981
 982         sch = to_subchannel(cdev->dev.parent);
 983         if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0)
 984                 /* Couldn't enable the subchannel for i/o. Sick device. */
 985                 return;
 986
 987         /* After 60s the device recognition is considered to have failed. */
 988         ccw_device_set_timeout(cdev, 60*HZ);
 989
 990         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
 991         ccw_device_sense_id_start(cdev);
 992 }
 993
 994 void ccw_device_trigger_reprobe(struct ccw_device *cdev)
 995 {
 996         struct subchannel *sch;
 997
 998         if (cdev->private->state != DEV_STATE_DISCONNECTED)
 999                 return;
1000
1001         sch = to_subchannel(cdev->dev.parent);
1002         /* Update some values. */
1003         if (stsch(sch->schid, &sch->schib))
1004                 return;
1005         if (!sch->schib.pmcw.dnv)
1006                 return;
1007         /*
1008          * The pim, pam, pom values may not be accurate, but they are the best
1009          * we have before performing device selection :/
1010          */
1011         sch->lpm = sch->schib.pmcw.pam & sch->opm;
1012         /* Re-set some bits in the pmcw that were lost. */
1013         sch->schib.pmcw.csense = 1;
1014         sch->schib.pmcw.ena = 0;
1015         if ((sch->lpm & (sch->lpm - 1)) != 0)
1016                 sch->schib.pmcw.mp = 1;
1017         /* We should also udate ssd info, but this has to wait. */
1018         /* Check if this is another device which appeared on the same sch. */
1019         if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1020                 PREPARE_WORK(&cdev->private->kick_work,
1021                              ccw_device_move_to_orphanage);
1022                 queue_work(slow_path_wq, &cdev->private->kick_work);
1023         } else
1024                 ccw_device_start_id(cdev, 0);
1025 }
1026
1027 static void
1028 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1029 {
1030         struct subchannel *sch;
1031
1032         sch = to_subchannel(cdev->dev.parent);
1033         /*
1034          * An interrupt in state offline means a previous disable was not
1035          * successful. Try again.
1036          */
1037         cio_disable_subchannel(sch);
1038 }
1039
1040 static void
1041 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1042 {
1043         retry_set_schib(cdev);
1044         cdev->private->state = DEV_STATE_ONLINE;
1045         dev_fsm_event(cdev, dev_event);
1046 }
1047
1048 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1049                                        enum dev_event dev_event)
1050 {
1051         cmf_retry_copy_block(cdev);
1052         cdev->private->state = DEV_STATE_ONLINE;
1053         dev_fsm_event(cdev, dev_event);
1054 }
1055
1056 static void
1057 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1058 {
1059         ccw_device_set_timeout(cdev, 0);
1060         if (dev_event == DEV_EVENT_NOTOPER)
1061                 cdev->private->state = DEV_STATE_NOT_OPER;
1062         else
1063                 cdev->private->state = DEV_STATE_OFFLINE;
1064         wake_up(&cdev->private->wait_q);
1065 }
1066
1067 static void
1068 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1069 {
1070         int ret;
1071
1072         ret = ccw_device_cancel_halt_clear(cdev);
1073         switch (ret) {
1074         case 0:
1075                 cdev->private->state = DEV_STATE_OFFLINE;
1076                 wake_up(&cdev->private->wait_q);
1077                 break;
1078         case -ENODEV:
1079                 cdev->private->state = DEV_STATE_NOT_OPER;
1080                 wake_up(&cdev->private->wait_q);
1081                 break;
1082         default:
1083                 ccw_device_set_timeout(cdev, HZ/10);
1084         }
1085 }
1086
1087 /*
1088  * No operation action. This is used e.g. to ignore a timeout event in
1089  * state offline.
1090  */
1091 static void
1092 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1093 {
1094 }
1095
1096 /*
1097  * Bug operation action.
1098  */
1099 static void
1100 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1101 {
1102         CIO_MSG_EVENT(0, "Internal state [%i][%i] not handled for device "
1103                       "0.%x.%04x\n", cdev->private->state, dev_event,
1104                       cdev->private->dev_id.ssid,
1105                       cdev->private->dev_id.devno);
1106         BUG();
1107 }
1108
1109 /*
1110  * device statemachine
1111  */
1112 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1113         [DEV_STATE_NOT_OPER] = {
1114                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1115                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1116                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1117                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1118         },
1119         [DEV_STATE_SENSE_PGID] = {
1120                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1121                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1122                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1123                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1124         },
1125         [DEV_STATE_SENSE_ID] = {
1126                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1127                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1128                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1129                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1130         },
1131         [DEV_STATE_OFFLINE] = {
1132                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1133                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1134                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1135                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1136         },
1137         [DEV_STATE_VERIFY] = {
1138                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1139                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1140                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1141                 [DEV_EVENT_VERIFY]      = ccw_device_delay_verify,
1142         },
1143         [DEV_STATE_ONLINE] = {
1144                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1145                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1146                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1147                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1148         },
1149         [DEV_STATE_W4SENSE] = {
1150                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1151                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1152                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1153                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1154         },
1155         [DEV_STATE_DISBAND_PGID] = {
1156                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1157                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1158                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1159                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1160         },
1161         [DEV_STATE_BOXED] = {
1162                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1163                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1164                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1165                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1166         },
1167         /* states to wait for i/o completion before doing something */
1168         [DEV_STATE_CLEAR_VERIFY] = {
1169                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1170                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1171                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1172                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1173         },
1174         [DEV_STATE_TIMEOUT_KILL] = {
1175                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1176                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1177                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1178                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1179         },
1180         [DEV_STATE_QUIESCE] = {
1181                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1182                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1183                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1184                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1185         },
1186         /* special states for devices gone not operational */
1187         [DEV_STATE_DISCONNECTED] = {
1188                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1189                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1190                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1191                 [DEV_EVENT_VERIFY]      = ccw_device_start_id,
1192         },
1193         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1194                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1195                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1196                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1197                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1198         },
1199         [DEV_STATE_CMFCHANGE] = {
1200                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1201                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1202                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1203                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1204         },
1205         [DEV_STATE_CMFUPDATE] = {
1206                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1207                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1208                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1209                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1210         },
1211 };
1212
1213 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);