err.no Git - linux-2.6/blob - drivers/s390/cio/device_fsm.c

   1 /*
   2  * drivers/s390/cio/device_fsm.c
   3  * finite state machine for device handling
   4  *
   5  *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
   6  *                       IBM Corporation
   7  *    Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
   8  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/jiffies.h>
  14 #include <linux/string.h>
  15
  16 #include <asm/ccwdev.h>
  17 #include <asm/cio.h>
  18 #include <asm/chpid.h>
  19
  20 #include "cio.h"
  21 #include "cio_debug.h"
  22 #include "css.h"
  23 #include "device.h"
  24 #include "chsc.h"
  25 #include "ioasm.h"
  26 #include "chp.h"
  27
  28 static int timeout_log_enabled;
  29
  30 int
  31 device_is_online(struct subchannel *sch)
  32 {
  33         struct ccw_device *cdev;
  34
  35         cdev = sch_get_cdev(sch);
  36         if (!cdev)
  37                 return 0;
  38         return (cdev->private->state == DEV_STATE_ONLINE);
  39 }
  40
  41 int
  42 device_is_disconnected(struct subchannel *sch)
  43 {
  44         struct ccw_device *cdev;
  45
  46         cdev = sch_get_cdev(sch);
  47         if (!cdev)
  48                 return 0;
  49         return (cdev->private->state == DEV_STATE_DISCONNECTED ||
  50                 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
  51 }
  52
  53 void
  54 device_set_disconnected(struct subchannel *sch)
  55 {
  56         struct ccw_device *cdev;
  57
  58         cdev = sch_get_cdev(sch);
  59         if (!cdev)
  60                 return;
  61         ccw_device_set_timeout(cdev, 0);
  62         cdev->private->flags.fake_irb = 0;
  63         cdev->private->state = DEV_STATE_DISCONNECTED;
  64         if (cdev->online)
  65                 ccw_device_schedule_recovery();
  66 }
  67
  68 void device_set_intretry(struct subchannel *sch)
  69 {
  70         struct ccw_device *cdev;
  71
  72         cdev = sch_get_cdev(sch);
  73         if (!cdev)
  74                 return;
  75         cdev->private->flags.intretry = 1;
  76 }
  77
  78 int device_trigger_verify(struct subchannel *sch)
  79 {
  80         struct ccw_device *cdev;
  81
  82         cdev = sch_get_cdev(sch);
  83         if (!cdev || !cdev->online)
  84                 return -EINVAL;
  85         dev_fsm_event(cdev, DEV_EVENT_VERIFY);
  86         return 0;
  87 }
  88
  89 static int __init ccw_timeout_log_setup(char *unused)
  90 {
  91         timeout_log_enabled = 1;
  92         return 1;
  93 }
  94
  95 __setup("ccw_timeout_log", ccw_timeout_log_setup);
  96
  97 static void ccw_timeout_log(struct ccw_device *cdev)
  98 {
  99         struct schib schib;
 100         struct subchannel *sch;
 101         struct io_subchannel_private *private;
 102         int cc;
 103
 104         sch = to_subchannel(cdev->dev.parent);
 105         private = to_io_private(sch);
 106         cc = stsch(sch->schid, &schib);
 107
 108         printk(KERN_WARNING "cio: ccw device timeout occurred at %llx, "
 109                "device information:\n", get_clock());
 110         printk(KERN_WARNING "cio: orb:\n");
 111         print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
 112                        &private->orb, sizeof(private->orb), 0);
 113         printk(KERN_WARNING "cio: ccw device bus id: %s\n", cdev->dev.bus_id);
 114         printk(KERN_WARNING "cio: subchannel bus id: %s\n", sch->dev.bus_id);
 115         printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, "
 116                "vpm: %02x\n", sch->lpm, sch->opm, sch->vpm);
 117
 118         if ((void *)(addr_t)private->orb.cpa == &private->sense_ccw ||
 119             (void *)(addr_t)private->orb.cpa == cdev->private->iccws)
 120                 printk(KERN_WARNING "cio: last channel program (intern):\n");
 121         else
 122                 printk(KERN_WARNING "cio: last channel program:\n");
 123
 124         print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
 125                        (void *)(addr_t)private->orb.cpa,
 126                        sizeof(struct ccw1), 0);
 127         printk(KERN_WARNING "cio: ccw device state: %d\n",
 128                cdev->private->state);
 129         printk(KERN_WARNING "cio: store subchannel returned: cc=%d\n", cc);
 130         printk(KERN_WARNING "cio: schib:\n");
 131         print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
 132                        &schib, sizeof(schib), 0);
 133         printk(KERN_WARNING "cio: ccw device flags:\n");
 134         print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
 135                        &cdev->private->flags, sizeof(cdev->private->flags), 0);
 136 }
 137
 138 /*
 139  * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
 140  */
 141 static void
 142 ccw_device_timeout(unsigned long data)
 143 {
 144         struct ccw_device *cdev;
 145
 146         cdev = (struct ccw_device *) data;
 147         spin_lock_irq(cdev->ccwlock);
 148         if (timeout_log_enabled)
 149                 ccw_timeout_log(cdev);
 150         dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
 151         spin_unlock_irq(cdev->ccwlock);
 152 }
 153
 154 /*
 155  * Set timeout
 156  */
 157 void
 158 ccw_device_set_timeout(struct ccw_device *cdev, int expires)
 159 {
 160         if (expires == 0) {
 161                 del_timer(&cdev->private->timer);
 162                 return;
 163         }
 164         if (timer_pending(&cdev->private->timer)) {
 165                 if (mod_timer(&cdev->private->timer, jiffies + expires))
 166                         return;
 167         }
 168         cdev->private->timer.function = ccw_device_timeout;
 169         cdev->private->timer.data = (unsigned long) cdev;
 170         cdev->private->timer.expires = jiffies + expires;
 171         add_timer(&cdev->private->timer);
 172 }
 173
 174 /* Kill any pending timers after machine check. */
 175 void
 176 device_kill_pending_timer(struct subchannel *sch)
 177 {
 178         struct ccw_device *cdev;
 179
 180         cdev = sch_get_cdev(sch);
 181         if (!cdev)
 182                 return;
 183         ccw_device_set_timeout(cdev, 0);
 184 }
 185
 186 /*
 187  * Cancel running i/o. This is called repeatedly since halt/clear are
 188  * asynchronous operations. We do one try with cio_cancel, two tries
 189  * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
 190  * Returns 0 if device now idle, -ENODEV for device not operational and
 191  * -EBUSY if an interrupt is expected (either from halt/clear or from a
 192  * status pending).
 193  */
 194 int
 195 ccw_device_cancel_halt_clear(struct ccw_device *cdev)
 196 {
 197         struct subchannel *sch;
 198         int ret;
 199
 200         sch = to_subchannel(cdev->dev.parent);
 201         ret = stsch(sch->schid, &sch->schib);
 202         if (ret || !sch->schib.pmcw.dnv)
 203                 return -ENODEV;
 204         if (!sch->schib.pmcw.ena)
 205                 /* Not operational -> done. */
 206                 return 0;
 207         /* Stage 1: cancel io. */
 208         if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) &&
 209             !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
 210                 ret = cio_cancel(sch);
 211                 if (ret != -EINVAL)
 212                         return ret;
 213                 /* cancel io unsuccessful. From now on it is asynchronous. */
 214                 cdev->private->iretry = 3;      /* 3 halt retries. */
 215         }
 216         if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
 217                 /* Stage 2: halt io. */
 218                 if (cdev->private->iretry) {
 219                         cdev->private->iretry--;
 220                         ret = cio_halt(sch);
 221                         if (ret != -EBUSY)
 222                                 return (ret == 0) ? -EBUSY : ret;
 223                 }
 224                 /* halt io unsuccessful. */
 225                 cdev->private->iretry = 255;    /* 255 clear retries. */
 226         }
 227         /* Stage 3: clear io. */
 228         if (cdev->private->iretry) {
 229                 cdev->private->iretry--;
 230                 ret = cio_clear (sch);
 231                 return (ret == 0) ? -EBUSY : ret;
 232         }
 233         panic("Can't stop i/o on subchannel.\n");
 234 }
 235
 236 static int
 237 ccw_device_handle_oper(struct ccw_device *cdev)
 238 {
 239         struct subchannel *sch;
 240
 241         sch = to_subchannel(cdev->dev.parent);
 242         cdev->private->flags.recog_done = 1;
 243         /*
 244          * Check if cu type and device type still match. If
 245          * not, it is certainly another device and we have to
 246          * de- and re-register.
 247          */
 248         if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
 249             cdev->id.cu_model != cdev->private->senseid.cu_model ||
 250             cdev->id.dev_type != cdev->private->senseid.dev_type ||
 251             cdev->id.dev_model != cdev->private->senseid.dev_model) {
 252                 PREPARE_WORK(&cdev->private->kick_work,
 253                              ccw_device_do_unreg_rereg);
 254                 queue_work(ccw_device_work, &cdev->private->kick_work);
 255                 return 0;
 256         }
 257         cdev->private->flags.donotify = 1;
 258         return 1;
 259 }
 260
 261 /*
 262  * The machine won't give us any notification by machine check if a chpid has
 263  * been varied online on the SE so we have to find out by magic (i. e. driving
 264  * the channel subsystem to device selection and updating our path masks).
 265  */
 266 static void
 267 __recover_lost_chpids(struct subchannel *sch, int old_lpm)
 268 {
 269         int mask, i;
 270         struct chp_id chpid;
 271
 272         chp_id_init(&chpid);
 273         for (i = 0; i<8; i++) {
 274                 mask = 0x80 >> i;
 275                 if (!(sch->lpm & mask))
 276                         continue;
 277                 if (old_lpm & mask)
 278                         continue;
 279                 chpid.id = sch->schib.pmcw.chpid[i];
 280                 if (!chp_is_registered(chpid))
 281                         css_schedule_eval_all();
 282         }
 283 }
 284
 285 /*
 286  * Stop device recognition.
 287  */
 288 static void
 289 ccw_device_recog_done(struct ccw_device *cdev, int state)
 290 {
 291         struct subchannel *sch;
 292         int notify, old_lpm, same_dev;
 293
 294         sch = to_subchannel(cdev->dev.parent);
 295
 296         ccw_device_set_timeout(cdev, 0);
 297         cio_disable_subchannel(sch);
 298         /*
 299          * Now that we tried recognition, we have performed device selection
 300          * through ssch() and the path information is up to date.
 301          */
 302         old_lpm = sch->lpm;
 303         stsch(sch->schid, &sch->schib);
 304         sch->lpm = sch->schib.pmcw.pam & sch->opm;
 305         /* Check since device may again have become not operational. */
 306         if (!sch->schib.pmcw.dnv)
 307                 state = DEV_STATE_NOT_OPER;
 308         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
 309                 /* Force reprobe on all chpids. */
 310                 old_lpm = 0;
 311         if (sch->lpm != old_lpm)
 312                 __recover_lost_chpids(sch, old_lpm);
 313         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 314                 if (state == DEV_STATE_NOT_OPER) {
 315                         cdev->private->flags.recog_done = 1;
 316                         cdev->private->state = DEV_STATE_DISCONNECTED;
 317                         return;
 318                 }
 319                 /* Boxed devices don't need extra treatment. */
 320         }
 321         notify = 0;
 322         same_dev = 0; /* Keep the compiler quiet... */
 323         switch (state) {
 324         case DEV_STATE_NOT_OPER:
 325                 CIO_DEBUG(KERN_WARNING, 2,
 326                           "SenseID : unknown device %04x on subchannel "
 327                           "0.%x.%04x\n", cdev->private->dev_id.devno,
 328                           sch->schid.ssid, sch->schid.sch_no);
 329                 break;
 330         case DEV_STATE_OFFLINE:
 331                 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 332                         same_dev = ccw_device_handle_oper(cdev);
 333                         notify = 1;
 334                 }
 335                 /* fill out sense information */
 336                 memset(&cdev->id, 0, sizeof(cdev->id));
 337                 cdev->id.cu_type   = cdev->private->senseid.cu_type;
 338                 cdev->id.cu_model  = cdev->private->senseid.cu_model;
 339                 cdev->id.dev_type  = cdev->private->senseid.dev_type;
 340                 cdev->id.dev_model = cdev->private->senseid.dev_model;
 341                 if (notify) {
 342                         cdev->private->state = DEV_STATE_OFFLINE;
 343                         if (same_dev) {
 344                                 /* Get device online again. */
 345                                 ccw_device_online(cdev);
 346                                 wake_up(&cdev->private->wait_q);
 347                         }
 348                         return;
 349                 }
 350                 /* Issue device info message. */
 351                 CIO_DEBUG(KERN_INFO, 2,
 352                           "SenseID : device 0.%x.%04x reports: "
 353                           "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
 354                           "%04X/%02X\n",
 355                           cdev->private->dev_id.ssid,
 356                           cdev->private->dev_id.devno,
 357                           cdev->id.cu_type, cdev->id.cu_model,
 358                           cdev->id.dev_type, cdev->id.dev_model);
 359                 break;
 360         case DEV_STATE_BOXED:
 361                 CIO_DEBUG(KERN_WARNING, 2,
 362                           "SenseID : boxed device %04x on subchannel "
 363                           "0.%x.%04x\n", cdev->private->dev_id.devno,
 364                           sch->schid.ssid, sch->schid.sch_no);
 365                 break;
 366         }
 367         cdev->private->state = state;
 368         io_subchannel_recog_done(cdev);
 369         if (state != DEV_STATE_NOT_OPER)
 370                 wake_up(&cdev->private->wait_q);
 371 }
 372
 373 /*
 374  * Function called from device_id.c after sense id has completed.
 375  */
 376 void
 377 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
 378 {
 379         switch (err) {
 380         case 0:
 381                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
 382                 break;
 383         case -ETIME:            /* Sense id stopped by timeout. */
 384                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 385                 break;
 386         default:
 387                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 388                 break;
 389         }
 390 }
 391
 392 static void
 393 ccw_device_oper_notify(struct work_struct *work)
 394 {
 395         struct ccw_device_private *priv;
 396         struct ccw_device *cdev;
 397         struct subchannel *sch;
 398         int ret;
 399         unsigned long flags;
 400
 401         priv = container_of(work, struct ccw_device_private, kick_work);
 402         cdev = priv->cdev;
 403         spin_lock_irqsave(cdev->ccwlock, flags);
 404         sch = to_subchannel(cdev->dev.parent);
 405         if (sch->driver && sch->driver->notify) {
 406                 spin_unlock_irqrestore(cdev->ccwlock, flags);
 407                 ret = sch->driver->notify(sch, CIO_OPER);
 408                 spin_lock_irqsave(cdev->ccwlock, flags);
 409         } else
 410                 ret = 0;
 411         if (ret) {
 412                 /* Reenable channel measurements, if needed. */
 413                 spin_unlock_irqrestore(cdev->ccwlock, flags);
 414                 cmf_reenable(cdev);
 415                 spin_lock_irqsave(cdev->ccwlock, flags);
 416                 wake_up(&cdev->private->wait_q);
 417         }
 418         spin_unlock_irqrestore(cdev->ccwlock, flags);
 419         if (!ret)
 420                 /* Driver doesn't want device back. */
 421                 ccw_device_do_unreg_rereg(work);
 422 }
 423
 424 /*
 425  * Finished with online/offline processing.
 426  */
 427 static void
 428 ccw_device_done(struct ccw_device *cdev, int state)
 429 {
 430         struct subchannel *sch;
 431
 432         sch = to_subchannel(cdev->dev.parent);
 433
 434         ccw_device_set_timeout(cdev, 0);
 435
 436         if (state != DEV_STATE_ONLINE)
 437                 cio_disable_subchannel(sch);
 438
 439         /* Reset device status. */
 440         memset(&cdev->private->irb, 0, sizeof(struct irb));
 441
 442         cdev->private->state = state;
 443
 444
 445         if (state == DEV_STATE_BOXED)
 446                 CIO_DEBUG(KERN_WARNING, 2,
 447                           "Boxed device %04x on subchannel %04x\n",
 448                           cdev->private->dev_id.devno, sch->schid.sch_no);
 449
 450         if (cdev->private->flags.donotify) {
 451                 cdev->private->flags.donotify = 0;
 452                 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify);
 453                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 454         }
 455         wake_up(&cdev->private->wait_q);
 456
 457         if (css_init_done && state != DEV_STATE_ONLINE)
 458                 put_device (&cdev->dev);
 459 }
 460
 461 static int cmp_pgid(struct pgid *p1, struct pgid *p2)
 462 {
 463         char *c1;
 464         char *c2;
 465
 466         c1 = (char *)p1;
 467         c2 = (char *)p2;
 468
 469         return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
 470 }
 471
 472 static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
 473 {
 474         int i;
 475         int last;
 476
 477         last = 0;
 478         for (i = 0; i < 8; i++) {
 479                 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
 480                         /* No PGID yet */
 481                         continue;
 482                 if (cdev->private->pgid[last].inf.ps.state1 ==
 483                     SNID_STATE1_RESET) {
 484                         /* First non-zero PGID */
 485                         last = i;
 486                         continue;
 487                 }
 488                 if (cmp_pgid(&cdev->private->pgid[i],
 489                              &cdev->private->pgid[last]) == 0)
 490                         /* Non-conflicting PGIDs */
 491                         continue;
 492
 493                 /* PGID mismatch, can't pathgroup. */
 494                 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
 495                               "0.%x.%04x, can't pathgroup\n",
 496                               cdev->private->dev_id.ssid,
 497                               cdev->private->dev_id.devno);
 498                 cdev->private->options.pgroup = 0;
 499                 return;
 500         }
 501         if (cdev->private->pgid[last].inf.ps.state1 ==
 502             SNID_STATE1_RESET)
 503                 /* No previous pgid found */
 504                 memcpy(&cdev->private->pgid[0],
 505                        &channel_subsystems[0]->global_pgid,
 506                        sizeof(struct pgid));
 507         else
 508                 /* Use existing pgid */
 509                 memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
 510                        sizeof(struct pgid));
 511 }
 512
 513 /*
 514  * Function called from device_pgid.c after sense path ground has completed.
 515  */
 516 void
 517 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
 518 {
 519         struct subchannel *sch;
 520
 521         sch = to_subchannel(cdev->dev.parent);
 522         switch (err) {
 523         case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
 524                 cdev->private->options.pgroup = 0;
 525                 break;
 526         case 0: /* success */
 527         case -EACCES: /* partial success, some paths not operational */
 528                 /* Check if all pgids are equal or 0. */
 529                 __ccw_device_get_common_pgid(cdev);
 530                 break;
 531         case -ETIME:            /* Sense path group id stopped by timeout. */
 532         case -EUSERS:           /* device is reserved for someone else. */
 533                 ccw_device_done(cdev, DEV_STATE_BOXED);
 534                 return;
 535         default:
 536                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 537                 return;
 538         }
 539         /* Start Path Group verification. */
 540         cdev->private->state = DEV_STATE_VERIFY;
 541         cdev->private->flags.doverify = 0;
 542         ccw_device_verify_start(cdev);
 543 }
 544
 545 /*
 546  * Start device recognition.
 547  */
 548 int
 549 ccw_device_recognition(struct ccw_device *cdev)
 550 {
 551         struct subchannel *sch;
 552         int ret;
 553
 554         if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
 555             (cdev->private->state != DEV_STATE_BOXED))
 556                 return -EINVAL;
 557         sch = to_subchannel(cdev->dev.parent);
 558         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc,
 559                                     (u32)(addr_t)sch);
 560         if (ret != 0)
 561                 /* Couldn't enable the subchannel for i/o. Sick device. */
 562                 return ret;
 563
 564         /* After 60s the device recognition is considered to have failed. */
 565         ccw_device_set_timeout(cdev, 60*HZ);
 566
 567         /*
 568          * We used to start here with a sense pgid to find out whether a device
 569          * is locked by someone else. Unfortunately, the sense pgid command
 570          * code has other meanings on devices predating the path grouping
 571          * algorithm, so we start with sense id and box the device after an
 572          * timeout (or if sense pgid during path verification detects the device
 573          * is locked, as may happen on newer devices).
 574          */
 575         cdev->private->flags.recog_done = 0;
 576         cdev->private->state = DEV_STATE_SENSE_ID;
 577         ccw_device_sense_id_start(cdev);
 578         return 0;
 579 }
 580
 581 /*
 582  * Handle timeout in device recognition.
 583  */
 584 static void
 585 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 586 {
 587         int ret;
 588
 589         ret = ccw_device_cancel_halt_clear(cdev);
 590         switch (ret) {
 591         case 0:
 592                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 593                 break;
 594         case -ENODEV:
 595                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 596                 break;
 597         default:
 598                 ccw_device_set_timeout(cdev, 3*HZ);
 599         }
 600 }
 601
 602
 603 void
 604 ccw_device_verify_done(struct ccw_device *cdev, int err)
 605 {
 606         struct subchannel *sch;
 607
 608         sch = to_subchannel(cdev->dev.parent);
 609         /* Update schib - pom may have changed. */
 610         stsch(sch->schid, &sch->schib);
 611         /* Update lpm with verified path mask. */
 612         sch->lpm = sch->vpm;
 613         /* Repeat path verification? */
 614         if (cdev->private->flags.doverify) {
 615                 cdev->private->flags.doverify = 0;
 616                 ccw_device_verify_start(cdev);
 617                 return;
 618         }
 619         switch (err) {
 620         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 621                 cdev->private->options.pgroup = 0;
 622         case 0:
 623                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 624                 /* Deliver fake irb to device driver, if needed. */
 625                 if (cdev->private->flags.fake_irb) {
 626                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 627                         cdev->private->irb.scsw.cc = 1;
 628                         cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC;
 629                         cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND;
 630                         cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND;
 631                         cdev->private->flags.fake_irb = 0;
 632                         if (cdev->handler)
 633                                 cdev->handler(cdev, cdev->private->intparm,
 634                                               &cdev->private->irb);
 635                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 636                 }
 637                 break;
 638         case -ETIME:
 639                 /* Reset oper notify indication after verify error. */
 640                 cdev->private->flags.donotify = 0;
 641                 ccw_device_done(cdev, DEV_STATE_BOXED);
 642                 break;
 643         default:
 644                 /* Reset oper notify indication after verify error. */
 645                 cdev->private->flags.donotify = 0;
 646                 if (cdev->online) {
 647                         ccw_device_set_timeout(cdev, 0);
 648                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 649                 } else
 650                         ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 651                 break;
 652         }
 653 }
 654
 655 /*
 656  * Get device online.
 657  */
 658 int
 659 ccw_device_online(struct ccw_device *cdev)
 660 {
 661         struct subchannel *sch;
 662         int ret;
 663
 664         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 665             (cdev->private->state != DEV_STATE_BOXED))
 666                 return -EINVAL;
 667         sch = to_subchannel(cdev->dev.parent);
 668         if (css_init_done && !get_device(&cdev->dev))
 669                 return -ENODEV;
 670         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc,
 671                                     (u32)(addr_t)sch);
 672         if (ret != 0) {
 673                 /* Couldn't enable the subchannel for i/o. Sick device. */
 674                 if (ret == -ENODEV)
 675                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 676                 return ret;
 677         }
 678         /* Do we want to do path grouping? */
 679         if (!cdev->private->options.pgroup) {
 680                 /* Start initial path verification. */
 681                 cdev->private->state = DEV_STATE_VERIFY;
 682                 cdev->private->flags.doverify = 0;
 683                 ccw_device_verify_start(cdev);
 684                 return 0;
 685         }
 686         /* Do a SensePGID first. */
 687         cdev->private->state = DEV_STATE_SENSE_PGID;
 688         ccw_device_sense_pgid_start(cdev);
 689         return 0;
 690 }
 691
 692 void
 693 ccw_device_disband_done(struct ccw_device *cdev, int err)
 694 {
 695         switch (err) {
 696         case 0:
 697                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 698                 break;
 699         case -ETIME:
 700                 ccw_device_done(cdev, DEV_STATE_BOXED);
 701                 break;
 702         default:
 703                 cdev->private->flags.donotify = 0;
 704                 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 705                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 706                 break;
 707         }
 708 }
 709
 710 /*
 711  * Shutdown device.
 712  */
 713 int
 714 ccw_device_offline(struct ccw_device *cdev)
 715 {
 716         struct subchannel *sch;
 717
 718         if (ccw_device_is_orphan(cdev)) {
 719                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 720                 return 0;
 721         }
 722         sch = to_subchannel(cdev->dev.parent);
 723         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
 724                 return -ENODEV;
 725         if (cdev->private->state != DEV_STATE_ONLINE) {
 726                 if (sch->schib.scsw.actl != 0)
 727                         return -EBUSY;
 728                 return -EINVAL;
 729         }
 730         if (sch->schib.scsw.actl != 0)
 731                 return -EBUSY;
 732         /* Are we doing path grouping? */
 733         if (!cdev->private->options.pgroup) {
 734                 /* No, set state offline immediately. */
 735                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 736                 return 0;
 737         }
 738         /* Start Set Path Group commands. */
 739         cdev->private->state = DEV_STATE_DISBAND_PGID;
 740         ccw_device_disband_start(cdev);
 741         return 0;
 742 }
 743
 744 /*
 745  * Handle timeout in device online/offline process.
 746  */
 747 static void
 748 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 749 {
 750         int ret;
 751
 752         ret = ccw_device_cancel_halt_clear(cdev);
 753         switch (ret) {
 754         case 0:
 755                 ccw_device_done(cdev, DEV_STATE_BOXED);
 756                 break;
 757         case -ENODEV:
 758                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 759                 break;
 760         default:
 761                 ccw_device_set_timeout(cdev, 3*HZ);
 762         }
 763 }
 764
 765 /*
 766  * Handle not oper event in device recognition.
 767  */
 768 static void
 769 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 770 {
 771         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 772 }
 773
 774 /*
 775  * Handle not operational event in non-special state.
 776  */
 777 static void ccw_device_generic_notoper(struct ccw_device *cdev,
 778                                        enum dev_event dev_event)
 779 {
 780         struct subchannel *sch;
 781
 782         cdev->private->state = DEV_STATE_NOT_OPER;
 783         sch = to_subchannel(cdev->dev.parent);
 784         css_schedule_eval(sch->schid);
 785 }
 786
 787 /*
 788  * Handle path verification event.
 789  */
 790 static void
 791 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 792 {
 793         struct subchannel *sch;
 794
 795         if (cdev->private->state == DEV_STATE_W4SENSE) {
 796                 cdev->private->flags.doverify = 1;
 797                 return;
 798         }
 799         sch = to_subchannel(cdev->dev.parent);
 800         /*
 801          * Since we might not just be coming from an interrupt from the
 802          * subchannel we have to update the schib.
 803          */
 804         stsch(sch->schid, &sch->schib);
 805
 806         if (sch->schib.scsw.actl != 0 ||
 807             (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) ||
 808             (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
 809                 /*
 810                  * No final status yet or final status not yet delivered
 811                  * to the device driver. Can't do path verfication now,
 812                  * delay until final status was delivered.
 813                  */
 814                 cdev->private->flags.doverify = 1;
 815                 return;
 816         }
 817         /* Device is idle, we can do the path verification. */
 818         cdev->private->state = DEV_STATE_VERIFY;
 819         cdev->private->flags.doverify = 0;
 820         ccw_device_verify_start(cdev);
 821 }
 822
 823 /*
 824  * Got an interrupt for a normal io (state online).
 825  */
 826 static void
 827 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 828 {
 829         struct irb *irb;
 830
 831         irb = (struct irb *) __LC_IRB;
 832         /* Check for unsolicited interrupt. */
 833         if ((irb->scsw.stctl ==
 834                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
 835             && (!irb->scsw.cc)) {
 836                 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 837                     !irb->esw.esw0.erw.cons) {
 838                         /* Unit check but no sense data. Need basic sense. */
 839                         if (ccw_device_do_sense(cdev, irb) != 0)
 840                                 goto call_handler_unsol;
 841                         memcpy(&cdev->private->irb, irb, sizeof(struct irb));
 842                         cdev->private->state = DEV_STATE_W4SENSE;
 843                         cdev->private->intparm = 0;
 844                         return;
 845                 }
 846 call_handler_unsol:
 847                 if (cdev->handler)
 848                         cdev->handler (cdev, 0, irb);
 849                 if (cdev->private->flags.doverify)
 850                         ccw_device_online_verify(cdev, 0);
 851                 return;
 852         }
 853         /* Accumulate status and find out if a basic sense is needed. */
 854         ccw_device_accumulate_irb(cdev, irb);
 855         if (cdev->private->flags.dosense) {
 856                 if (ccw_device_do_sense(cdev, irb) == 0) {
 857                         cdev->private->state = DEV_STATE_W4SENSE;
 858                 }
 859                 return;
 860         }
 861         /* Call the handler. */
 862         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 863                 /* Start delayed path verification. */
 864                 ccw_device_online_verify(cdev, 0);
 865 }
 866
 867 /*
 868  * Got an timeout in online state.
 869  */
 870 static void
 871 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 872 {
 873         int ret;
 874
 875         ccw_device_set_timeout(cdev, 0);
 876         ret = ccw_device_cancel_halt_clear(cdev);
 877         if (ret == -EBUSY) {
 878                 ccw_device_set_timeout(cdev, 3*HZ);
 879                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 880                 return;
 881         }
 882         if (ret == -ENODEV)
 883                 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 884         else if (cdev->handler)
 885                 cdev->handler(cdev, cdev->private->intparm,
 886                               ERR_PTR(-ETIMEDOUT));
 887 }
 888
 889 /*
 890  * Got an interrupt for a basic sense.
 891  */
 892 static void
 893 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 894 {
 895         struct irb *irb;
 896
 897         irb = (struct irb *) __LC_IRB;
 898         /* Check for unsolicited interrupt. */
 899         if (irb->scsw.stctl ==
 900                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 901                 if (irb->scsw.cc == 1)
 902                         /* Basic sense hasn't started. Try again. */
 903                         ccw_device_do_sense(cdev, irb);
 904                 else {
 905                         CIO_MSG_EVENT(2, "Huh? 0.%x.%04x: unsolicited "
 906                                       "interrupt during w4sense...\n",
 907                                       cdev->private->dev_id.ssid,
 908                                       cdev->private->dev_id.devno);
 909                         if (cdev->handler)
 910                                 cdev->handler (cdev, 0, irb);
 911                 }
 912                 return;
 913         }
 914         /*
 915          * Check if a halt or clear has been issued in the meanwhile. If yes,
 916          * only deliver the halt/clear interrupt to the device driver as if it
 917          * had killed the original request.
 918          */
 919         if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
 920                 /* Retry Basic Sense if requested. */
 921                 if (cdev->private->flags.intretry) {
 922                         cdev->private->flags.intretry = 0;
 923                         ccw_device_do_sense(cdev, irb);
 924                         return;
 925                 }
 926                 cdev->private->flags.dosense = 0;
 927                 memset(&cdev->private->irb, 0, sizeof(struct irb));
 928                 ccw_device_accumulate_irb(cdev, irb);
 929                 goto call_handler;
 930         }
 931         /* Add basic sense info to irb. */
 932         ccw_device_accumulate_basic_sense(cdev, irb);
 933         if (cdev->private->flags.dosense) {
 934                 /* Another basic sense is needed. */
 935                 ccw_device_do_sense(cdev, irb);
 936                 return;
 937         }
 938 call_handler:
 939         cdev->private->state = DEV_STATE_ONLINE;
 940         /* Call the handler. */
 941         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 942                 /* Start delayed path verification. */
 943                 ccw_device_online_verify(cdev, 0);
 944 }
 945
 946 static void
 947 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 948 {
 949         struct irb *irb;
 950
 951         irb = (struct irb *) __LC_IRB;
 952         /* Accumulate status. We don't do basic sense. */
 953         ccw_device_accumulate_irb(cdev, irb);
 954         /* Remember to clear irb to avoid residuals. */
 955         memset(&cdev->private->irb, 0, sizeof(struct irb));
 956         /* Try to start delayed device verification. */
 957         ccw_device_online_verify(cdev, 0);
 958         /* Note: Don't call handler for cio initiated clear! */
 959 }
 960
 961 static void
 962 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
 963 {
 964         struct subchannel *sch;
 965
 966         sch = to_subchannel(cdev->dev.parent);
 967         ccw_device_set_timeout(cdev, 0);
 968         /* Start delayed path verification. */
 969         ccw_device_online_verify(cdev, 0);
 970         /* OK, i/o is dead now. Call interrupt handler. */
 971         if (cdev->handler)
 972                 cdev->handler(cdev, cdev->private->intparm,
 973                               ERR_PTR(-EIO));
 974 }
 975
 976 static void
 977 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 978 {
 979         int ret;
 980
 981         ret = ccw_device_cancel_halt_clear(cdev);
 982         if (ret == -EBUSY) {
 983                 ccw_device_set_timeout(cdev, 3*HZ);
 984                 return;
 985         }
 986         /* Start delayed path verification. */
 987         ccw_device_online_verify(cdev, 0);
 988         if (cdev->handler)
 989                 cdev->handler(cdev, cdev->private->intparm,
 990                               ERR_PTR(-EIO));
 991 }
 992
 993 void device_kill_io(struct subchannel *sch)
 994 {
 995         int ret;
 996         struct ccw_device *cdev;
 997
 998         cdev = sch_get_cdev(sch);
 999         ret = ccw_device_cancel_halt_clear(cdev);
1000         if (ret == -EBUSY) {
1001                 ccw_device_set_timeout(cdev, 3*HZ);
1002                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
1003                 return;
1004         }
1005         /* Start delayed path verification. */
1006         ccw_device_online_verify(cdev, 0);
1007         if (cdev->handler)
1008                 cdev->handler(cdev, cdev->private->intparm,
1009                               ERR_PTR(-EIO));
1010 }
1011
1012 static void
1013 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
1014 {
1015         /* Start verification after current task finished. */
1016         cdev->private->flags.doverify = 1;
1017 }
1018
1019 static void
1020 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1021 {
1022         struct irb *irb;
1023
1024         switch (dev_event) {
1025         case DEV_EVENT_INTERRUPT:
1026                 irb = (struct irb *) __LC_IRB;
1027                 /* Check for unsolicited interrupt. */
1028                 if ((irb->scsw.stctl ==
1029                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1030                     (!irb->scsw.cc))
1031                         /* FIXME: we should restart stlck here, but this
1032                          * is extremely unlikely ... */
1033                         goto out_wakeup;
1034
1035                 ccw_device_accumulate_irb(cdev, irb);
1036                 /* We don't care about basic sense etc. */
1037                 break;
1038         default: /* timeout */
1039                 break;
1040         }
1041 out_wakeup:
1042         wake_up(&cdev->private->wait_q);
1043 }
1044
1045 static void
1046 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1047 {
1048         struct subchannel *sch;
1049
1050         sch = to_subchannel(cdev->dev.parent);
1051         if (cio_enable_subchannel(sch, sch->schib.pmcw.isc,
1052                                   (u32)(addr_t)sch) != 0)
1053                 /* Couldn't enable the subchannel for i/o. Sick device. */
1054                 return;
1055
1056         /* After 60s the device recognition is considered to have failed. */
1057         ccw_device_set_timeout(cdev, 60*HZ);
1058
1059         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1060         ccw_device_sense_id_start(cdev);
1061 }
1062
1063 void
1064 device_trigger_reprobe(struct subchannel *sch)
1065 {
1066         struct ccw_device *cdev;
1067
1068         cdev = sch_get_cdev(sch);
1069         if (!cdev)
1070                 return;
1071         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1072                 return;
1073
1074         /* Update some values. */
1075         if (stsch(sch->schid, &sch->schib))
1076                 return;
1077         if (!sch->schib.pmcw.dnv)
1078                 return;
1079         /*
1080          * The pim, pam, pom values may not be accurate, but they are the best
1081          * we have before performing device selection :/
1082          */
1083         sch->lpm = sch->schib.pmcw.pam & sch->opm;
1084         /* Re-set some bits in the pmcw that were lost. */
1085         sch->schib.pmcw.isc = 3;
1086         sch->schib.pmcw.csense = 1;
1087         sch->schib.pmcw.ena = 0;
1088         if ((sch->lpm & (sch->lpm - 1)) != 0)
1089                 sch->schib.pmcw.mp = 1;
1090         sch->schib.pmcw.intparm = (u32)(addr_t)sch;
1091         /* We should also udate ssd info, but this has to wait. */
1092         /* Check if this is another device which appeared on the same sch. */
1093         if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1094                 PREPARE_WORK(&cdev->private->kick_work,
1095                              ccw_device_move_to_orphanage);
1096                 queue_work(slow_path_wq, &cdev->private->kick_work);
1097         } else
1098                 ccw_device_start_id(cdev, 0);
1099 }
1100
1101 static void
1102 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1103 {
1104         struct subchannel *sch;
1105
1106         sch = to_subchannel(cdev->dev.parent);
1107         /*
1108          * An interrupt in state offline means a previous disable was not
1109          * successful. Try again.
1110          */
1111         cio_disable_subchannel(sch);
1112 }
1113
1114 static void
1115 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1116 {
1117         retry_set_schib(cdev);
1118         cdev->private->state = DEV_STATE_ONLINE;
1119         dev_fsm_event(cdev, dev_event);
1120 }
1121
1122 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1123                                        enum dev_event dev_event)
1124 {
1125         cmf_retry_copy_block(cdev);
1126         cdev->private->state = DEV_STATE_ONLINE;
1127         dev_fsm_event(cdev, dev_event);
1128 }
1129
1130 static void
1131 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1132 {
1133         ccw_device_set_timeout(cdev, 0);
1134         if (dev_event == DEV_EVENT_NOTOPER)
1135                 cdev->private->state = DEV_STATE_NOT_OPER;
1136         else
1137                 cdev->private->state = DEV_STATE_OFFLINE;
1138         wake_up(&cdev->private->wait_q);
1139 }
1140
1141 static void
1142 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1143 {
1144         int ret;
1145
1146         ret = ccw_device_cancel_halt_clear(cdev);
1147         switch (ret) {
1148         case 0:
1149                 cdev->private->state = DEV_STATE_OFFLINE;
1150                 wake_up(&cdev->private->wait_q);
1151                 break;
1152         case -ENODEV:
1153                 cdev->private->state = DEV_STATE_NOT_OPER;
1154                 wake_up(&cdev->private->wait_q);
1155                 break;
1156         default:
1157                 ccw_device_set_timeout(cdev, HZ/10);
1158         }
1159 }
1160
1161 /*
1162  * No operation action. This is used e.g. to ignore a timeout event in
1163  * state offline.
1164  */
1165 static void
1166 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1167 {
1168 }
1169
1170 /*
1171  * Bug operation action.
1172  */
1173 static void
1174 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1175 {
1176         CIO_MSG_EVENT(0, "dev_jumptable[%i][%i] == NULL\n",
1177                       cdev->private->state, dev_event);
1178         BUG();
1179 }
1180
1181 /*
1182  * device statemachine
1183  */
1184 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1185         [DEV_STATE_NOT_OPER] = {
1186                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1187                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1188                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1189                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1190         },
1191         [DEV_STATE_SENSE_PGID] = {
1192                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1193                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1194                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1195                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1196         },
1197         [DEV_STATE_SENSE_ID] = {
1198                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1199                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1200                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1201                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1202         },
1203         [DEV_STATE_OFFLINE] = {
1204                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1205                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1206                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1207                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1208         },
1209         [DEV_STATE_VERIFY] = {
1210                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1211                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1212                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1213                 [DEV_EVENT_VERIFY]      = ccw_device_delay_verify,
1214         },
1215         [DEV_STATE_ONLINE] = {
1216                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1217                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1218                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1219                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1220         },
1221         [DEV_STATE_W4SENSE] = {
1222                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1223                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1224                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1225                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1226         },
1227         [DEV_STATE_DISBAND_PGID] = {
1228                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1229                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1230                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1231                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1232         },
1233         [DEV_STATE_BOXED] = {
1234                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1235                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1236                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1237                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1238         },
1239         /* states to wait for i/o completion before doing something */
1240         [DEV_STATE_CLEAR_VERIFY] = {
1241                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1242                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1243                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1244                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1245         },
1246         [DEV_STATE_TIMEOUT_KILL] = {
1247                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1248                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1249                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1250                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1251         },
1252         [DEV_STATE_QUIESCE] = {
1253                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1254                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1255                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1256                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1257         },
1258         /* special states for devices gone not operational */
1259         [DEV_STATE_DISCONNECTED] = {
1260                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1261                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1262                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1263                 [DEV_EVENT_VERIFY]      = ccw_device_start_id,
1264         },
1265         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1266                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1267                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1268                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1269                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1270         },
1271         [DEV_STATE_CMFCHANGE] = {
1272                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1273                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1274                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1275                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1276         },
1277         [DEV_STATE_CMFUPDATE] = {
1278                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1279                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1280                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1281                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1282         },
1283 };
1284
1285 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);