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_MSG_EVENT(2, "SenseID : unknown device %04x on "
 326                               "subchannel 0.%x.%04x\n",
 327                               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_MSG_EVENT(4, "SenseID : device 0.%x.%04x reports: "
 352                               "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
 353                               "%04X/%02X\n",
 354                               cdev->private->dev_id.ssid,
 355                               cdev->private->dev_id.devno,
 356                               cdev->id.cu_type, cdev->id.cu_model,
 357                               cdev->id.dev_type, cdev->id.dev_model);
 358                 break;
 359         case DEV_STATE_BOXED:
 360                 CIO_MSG_EVENT(0, "SenseID : boxed device %04x on "
 361                               " subchannel 0.%x.%04x\n",
 362                               cdev->private->dev_id.devno,
 363                               sch->schid.ssid, sch->schid.sch_no);
 364                 break;
 365         }
 366         cdev->private->state = state;
 367         io_subchannel_recog_done(cdev);
 368         if (state != DEV_STATE_NOT_OPER)
 369                 wake_up(&cdev->private->wait_q);
 370 }
 371
 372 /*
 373  * Function called from device_id.c after sense id has completed.
 374  */
 375 void
 376 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
 377 {
 378         switch (err) {
 379         case 0:
 380                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
 381                 break;
 382         case -ETIME:            /* Sense id stopped by timeout. */
 383                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 384                 break;
 385         default:
 386                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 387                 break;
 388         }
 389 }
 390
 391 static void
 392 ccw_device_oper_notify(struct work_struct *work)
 393 {
 394         struct ccw_device_private *priv;
 395         struct ccw_device *cdev;
 396         struct subchannel *sch;
 397         int ret;
 398         unsigned long flags;
 399
 400         priv = container_of(work, struct ccw_device_private, kick_work);
 401         cdev = priv->cdev;
 402         spin_lock_irqsave(cdev->ccwlock, flags);
 403         sch = to_subchannel(cdev->dev.parent);
 404         if (sch->driver && sch->driver->notify) {
 405                 spin_unlock_irqrestore(cdev->ccwlock, flags);
 406                 ret = sch->driver->notify(sch, CIO_OPER);
 407                 spin_lock_irqsave(cdev->ccwlock, flags);
 408         } else
 409                 ret = 0;
 410         if (ret) {
 411                 /* Reenable channel measurements, if needed. */
 412                 spin_unlock_irqrestore(cdev->ccwlock, flags);
 413                 cmf_reenable(cdev);
 414                 spin_lock_irqsave(cdev->ccwlock, flags);
 415                 wake_up(&cdev->private->wait_q);
 416         }
 417         spin_unlock_irqrestore(cdev->ccwlock, flags);
 418         if (!ret)
 419                 /* Driver doesn't want device back. */
 420                 ccw_device_do_unreg_rereg(work);
 421 }
 422
 423 /*
 424  * Finished with online/offline processing.
 425  */
 426 static void
 427 ccw_device_done(struct ccw_device *cdev, int state)
 428 {
 429         struct subchannel *sch;
 430
 431         sch = to_subchannel(cdev->dev.parent);
 432
 433         ccw_device_set_timeout(cdev, 0);
 434
 435         if (state != DEV_STATE_ONLINE)
 436                 cio_disable_subchannel(sch);
 437
 438         /* Reset device status. */
 439         memset(&cdev->private->irb, 0, sizeof(struct irb));
 440
 441         cdev->private->state = state;
 442
 443
 444         if (state == DEV_STATE_BOXED)
 445                 CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n",
 446                               cdev->private->dev_id.devno, sch->schid.sch_no);
 447
 448         if (cdev->private->flags.donotify) {
 449                 cdev->private->flags.donotify = 0;
 450                 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify);
 451                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 452         }
 453         wake_up(&cdev->private->wait_q);
 454
 455         if (css_init_done && state != DEV_STATE_ONLINE)
 456                 put_device (&cdev->dev);
 457 }
 458
 459 static int cmp_pgid(struct pgid *p1, struct pgid *p2)
 460 {
 461         char *c1;
 462         char *c2;
 463
 464         c1 = (char *)p1;
 465         c2 = (char *)p2;
 466
 467         return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
 468 }
 469
 470 static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
 471 {
 472         int i;
 473         int last;
 474
 475         last = 0;
 476         for (i = 0; i < 8; i++) {
 477                 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
 478                         /* No PGID yet */
 479                         continue;
 480                 if (cdev->private->pgid[last].inf.ps.state1 ==
 481                     SNID_STATE1_RESET) {
 482                         /* First non-zero PGID */
 483                         last = i;
 484                         continue;
 485                 }
 486                 if (cmp_pgid(&cdev->private->pgid[i],
 487                              &cdev->private->pgid[last]) == 0)
 488                         /* Non-conflicting PGIDs */
 489                         continue;
 490
 491                 /* PGID mismatch, can't pathgroup. */
 492                 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
 493                               "0.%x.%04x, can't pathgroup\n",
 494                               cdev->private->dev_id.ssid,
 495                               cdev->private->dev_id.devno);
 496                 cdev->private->options.pgroup = 0;
 497                 return;
 498         }
 499         if (cdev->private->pgid[last].inf.ps.state1 ==
 500             SNID_STATE1_RESET)
 501                 /* No previous pgid found */
 502                 memcpy(&cdev->private->pgid[0],
 503                        &channel_subsystems[0]->global_pgid,
 504                        sizeof(struct pgid));
 505         else
 506                 /* Use existing pgid */
 507                 memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
 508                        sizeof(struct pgid));
 509 }
 510
 511 /*
 512  * Function called from device_pgid.c after sense path ground has completed.
 513  */
 514 void
 515 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
 516 {
 517         struct subchannel *sch;
 518
 519         sch = to_subchannel(cdev->dev.parent);
 520         switch (err) {
 521         case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
 522                 cdev->private->options.pgroup = 0;
 523                 break;
 524         case 0: /* success */
 525         case -EACCES: /* partial success, some paths not operational */
 526                 /* Check if all pgids are equal or 0. */
 527                 __ccw_device_get_common_pgid(cdev);
 528                 break;
 529         case -ETIME:            /* Sense path group id stopped by timeout. */
 530         case -EUSERS:           /* device is reserved for someone else. */
 531                 ccw_device_done(cdev, DEV_STATE_BOXED);
 532                 return;
 533         default:
 534                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 535                 return;
 536         }
 537         /* Start Path Group verification. */
 538         cdev->private->state = DEV_STATE_VERIFY;
 539         cdev->private->flags.doverify = 0;
 540         ccw_device_verify_start(cdev);
 541 }
 542
 543 /*
 544  * Start device recognition.
 545  */
 546 int
 547 ccw_device_recognition(struct ccw_device *cdev)
 548 {
 549         struct subchannel *sch;
 550         int ret;
 551
 552         if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
 553             (cdev->private->state != DEV_STATE_BOXED))
 554                 return -EINVAL;
 555         sch = to_subchannel(cdev->dev.parent);
 556         ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
 557         if (ret != 0)
 558                 /* Couldn't enable the subchannel for i/o. Sick device. */
 559                 return ret;
 560
 561         /* After 60s the device recognition is considered to have failed. */
 562         ccw_device_set_timeout(cdev, 60*HZ);
 563
 564         /*
 565          * We used to start here with a sense pgid to find out whether a device
 566          * is locked by someone else. Unfortunately, the sense pgid command
 567          * code has other meanings on devices predating the path grouping
 568          * algorithm, so we start with sense id and box the device after an
 569          * timeout (or if sense pgid during path verification detects the device
 570          * is locked, as may happen on newer devices).
 571          */
 572         cdev->private->flags.recog_done = 0;
 573         cdev->private->state = DEV_STATE_SENSE_ID;
 574         ccw_device_sense_id_start(cdev);
 575         return 0;
 576 }
 577
 578 /*
 579  * Handle timeout in device recognition.
 580  */
 581 static void
 582 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 583 {
 584         int ret;
 585
 586         ret = ccw_device_cancel_halt_clear(cdev);
 587         switch (ret) {
 588         case 0:
 589                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 590                 break;
 591         case -ENODEV:
 592                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 593                 break;
 594         default:
 595                 ccw_device_set_timeout(cdev, 3*HZ);
 596         }
 597 }
 598
 599
 600 void
 601 ccw_device_verify_done(struct ccw_device *cdev, int err)
 602 {
 603         struct subchannel *sch;
 604
 605         sch = to_subchannel(cdev->dev.parent);
 606         /* Update schib - pom may have changed. */
 607         stsch(sch->schid, &sch->schib);
 608         /* Update lpm with verified path mask. */
 609         sch->lpm = sch->vpm;
 610         /* Repeat path verification? */
 611         if (cdev->private->flags.doverify) {
 612                 cdev->private->flags.doverify = 0;
 613                 ccw_device_verify_start(cdev);
 614                 return;
 615         }
 616         switch (err) {
 617         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 618                 cdev->private->options.pgroup = 0;
 619         case 0:
 620                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 621                 /* Deliver fake irb to device driver, if needed. */
 622                 if (cdev->private->flags.fake_irb) {
 623                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 624                         cdev->private->irb.scsw.cc = 1;
 625                         cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC;
 626                         cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND;
 627                         cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND;
 628                         cdev->private->flags.fake_irb = 0;
 629                         if (cdev->handler)
 630                                 cdev->handler(cdev, cdev->private->intparm,
 631                                               &cdev->private->irb);
 632                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 633                 }
 634                 break;
 635         case -ETIME:
 636                 /* Reset oper notify indication after verify error. */
 637                 cdev->private->flags.donotify = 0;
 638                 ccw_device_done(cdev, DEV_STATE_BOXED);
 639                 break;
 640         default:
 641                 /* Reset oper notify indication after verify error. */
 642                 cdev->private->flags.donotify = 0;
 643                 if (cdev->online) {
 644                         ccw_device_set_timeout(cdev, 0);
 645                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 646                 } else
 647                         ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 648                 break;
 649         }
 650 }
 651
 652 /*
 653  * Get device online.
 654  */
 655 int
 656 ccw_device_online(struct ccw_device *cdev)
 657 {
 658         struct subchannel *sch;
 659         int ret;
 660
 661         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 662             (cdev->private->state != DEV_STATE_BOXED))
 663                 return -EINVAL;
 664         sch = to_subchannel(cdev->dev.parent);
 665         if (css_init_done && !get_device(&cdev->dev))
 666                 return -ENODEV;
 667         ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
 668         if (ret != 0) {
 669                 /* Couldn't enable the subchannel for i/o. Sick device. */
 670                 if (ret == -ENODEV)
 671                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 672                 return ret;
 673         }
 674         /* Do we want to do path grouping? */
 675         if (!cdev->private->options.pgroup) {
 676                 /* Start initial path verification. */
 677                 cdev->private->state = DEV_STATE_VERIFY;
 678                 cdev->private->flags.doverify = 0;
 679                 ccw_device_verify_start(cdev);
 680                 return 0;
 681         }
 682         /* Do a SensePGID first. */
 683         cdev->private->state = DEV_STATE_SENSE_PGID;
 684         ccw_device_sense_pgid_start(cdev);
 685         return 0;
 686 }
 687
 688 void
 689 ccw_device_disband_done(struct ccw_device *cdev, int err)
 690 {
 691         switch (err) {
 692         case 0:
 693                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 694                 break;
 695         case -ETIME:
 696                 ccw_device_done(cdev, DEV_STATE_BOXED);
 697                 break;
 698         default:
 699                 cdev->private->flags.donotify = 0;
 700                 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 701                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 702                 break;
 703         }
 704 }
 705
 706 /*
 707  * Shutdown device.
 708  */
 709 int
 710 ccw_device_offline(struct ccw_device *cdev)
 711 {
 712         struct subchannel *sch;
 713
 714         if (ccw_device_is_orphan(cdev)) {
 715                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 716                 return 0;
 717         }
 718         sch = to_subchannel(cdev->dev.parent);
 719         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
 720                 return -ENODEV;
 721         if (cdev->private->state != DEV_STATE_ONLINE) {
 722                 if (sch->schib.scsw.actl != 0)
 723                         return -EBUSY;
 724                 return -EINVAL;
 725         }
 726         if (sch->schib.scsw.actl != 0)
 727                 return -EBUSY;
 728         /* Are we doing path grouping? */
 729         if (!cdev->private->options.pgroup) {
 730                 /* No, set state offline immediately. */
 731                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 732                 return 0;
 733         }
 734         /* Start Set Path Group commands. */
 735         cdev->private->state = DEV_STATE_DISBAND_PGID;
 736         ccw_device_disband_start(cdev);
 737         return 0;
 738 }
 739
 740 /*
 741  * Handle timeout in device online/offline process.
 742  */
 743 static void
 744 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 745 {
 746         int ret;
 747
 748         ret = ccw_device_cancel_halt_clear(cdev);
 749         switch (ret) {
 750         case 0:
 751                 ccw_device_done(cdev, DEV_STATE_BOXED);
 752                 break;
 753         case -ENODEV:
 754                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 755                 break;
 756         default:
 757                 ccw_device_set_timeout(cdev, 3*HZ);
 758         }
 759 }
 760
 761 /*
 762  * Handle not oper event in device recognition.
 763  */
 764 static void
 765 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 766 {
 767         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 768 }
 769
 770 /*
 771  * Handle not operational event in non-special state.
 772  */
 773 static void ccw_device_generic_notoper(struct ccw_device *cdev,
 774                                        enum dev_event dev_event)
 775 {
 776         struct subchannel *sch;
 777
 778         cdev->private->state = DEV_STATE_NOT_OPER;
 779         sch = to_subchannel(cdev->dev.parent);
 780         css_schedule_eval(sch->schid);
 781 }
 782
 783 /*
 784  * Handle path verification event.
 785  */
 786 static void
 787 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 788 {
 789         struct subchannel *sch;
 790
 791         if (cdev->private->state == DEV_STATE_W4SENSE) {
 792                 cdev->private->flags.doverify = 1;
 793                 return;
 794         }
 795         sch = to_subchannel(cdev->dev.parent);
 796         /*
 797          * Since we might not just be coming from an interrupt from the
 798          * subchannel we have to update the schib.
 799          */
 800         stsch(sch->schid, &sch->schib);
 801
 802         if (sch->schib.scsw.actl != 0 ||
 803             (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) ||
 804             (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
 805                 /*
 806                  * No final status yet or final status not yet delivered
 807                  * to the device driver. Can't do path verfication now,
 808                  * delay until final status was delivered.
 809                  */
 810                 cdev->private->flags.doverify = 1;
 811                 return;
 812         }
 813         /* Device is idle, we can do the path verification. */
 814         cdev->private->state = DEV_STATE_VERIFY;
 815         cdev->private->flags.doverify = 0;
 816         ccw_device_verify_start(cdev);
 817 }
 818
 819 /*
 820  * Got an interrupt for a normal io (state online).
 821  */
 822 static void
 823 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 824 {
 825         struct irb *irb;
 826
 827         irb = (struct irb *) __LC_IRB;
 828         /* Check for unsolicited interrupt. */
 829         if ((irb->scsw.stctl ==
 830                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
 831             && (!irb->scsw.cc)) {
 832                 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 833                     !irb->esw.esw0.erw.cons) {
 834                         /* Unit check but no sense data. Need basic sense. */
 835                         if (ccw_device_do_sense(cdev, irb) != 0)
 836                                 goto call_handler_unsol;
 837                         memcpy(&cdev->private->irb, irb, sizeof(struct irb));
 838                         cdev->private->state = DEV_STATE_W4SENSE;
 839                         cdev->private->intparm = 0;
 840                         return;
 841                 }
 842 call_handler_unsol:
 843                 if (cdev->handler)
 844                         cdev->handler (cdev, 0, irb);
 845                 if (cdev->private->flags.doverify)
 846                         ccw_device_online_verify(cdev, 0);
 847                 return;
 848         }
 849         /* Accumulate status and find out if a basic sense is needed. */
 850         ccw_device_accumulate_irb(cdev, irb);
 851         if (cdev->private->flags.dosense) {
 852                 if (ccw_device_do_sense(cdev, irb) == 0) {
 853                         cdev->private->state = DEV_STATE_W4SENSE;
 854                 }
 855                 return;
 856         }
 857         /* Call the handler. */
 858         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 859                 /* Start delayed path verification. */
 860                 ccw_device_online_verify(cdev, 0);
 861 }
 862
 863 /*
 864  * Got an timeout in online state.
 865  */
 866 static void
 867 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 868 {
 869         int ret;
 870
 871         ccw_device_set_timeout(cdev, 0);
 872         ret = ccw_device_cancel_halt_clear(cdev);
 873         if (ret == -EBUSY) {
 874                 ccw_device_set_timeout(cdev, 3*HZ);
 875                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 876                 return;
 877         }
 878         if (ret == -ENODEV)
 879                 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 880         else if (cdev->handler)
 881                 cdev->handler(cdev, cdev->private->intparm,
 882                               ERR_PTR(-ETIMEDOUT));
 883 }
 884
 885 /*
 886  * Got an interrupt for a basic sense.
 887  */
 888 static void
 889 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 890 {
 891         struct irb *irb;
 892
 893         irb = (struct irb *) __LC_IRB;
 894         /* Check for unsolicited interrupt. */
 895         if (irb->scsw.stctl ==
 896                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 897                 if (irb->scsw.cc == 1)
 898                         /* Basic sense hasn't started. Try again. */
 899                         ccw_device_do_sense(cdev, irb);
 900                 else {
 901                         CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited "
 902                                       "interrupt during w4sense...\n",
 903                                       cdev->private->dev_id.ssid,
 904                                       cdev->private->dev_id.devno);
 905                         if (cdev->handler)
 906                                 cdev->handler (cdev, 0, irb);
 907                 }
 908                 return;
 909         }
 910         /*
 911          * Check if a halt or clear has been issued in the meanwhile. If yes,
 912          * only deliver the halt/clear interrupt to the device driver as if it
 913          * had killed the original request.
 914          */
 915         if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
 916                 /* Retry Basic Sense if requested. */
 917                 if (cdev->private->flags.intretry) {
 918                         cdev->private->flags.intretry = 0;
 919                         ccw_device_do_sense(cdev, irb);
 920                         return;
 921                 }
 922                 cdev->private->flags.dosense = 0;
 923                 memset(&cdev->private->irb, 0, sizeof(struct irb));
 924                 ccw_device_accumulate_irb(cdev, irb);
 925                 goto call_handler;
 926         }
 927         /* Add basic sense info to irb. */
 928         ccw_device_accumulate_basic_sense(cdev, irb);
 929         if (cdev->private->flags.dosense) {
 930                 /* Another basic sense is needed. */
 931                 ccw_device_do_sense(cdev, irb);
 932                 return;
 933         }
 934 call_handler:
 935         cdev->private->state = DEV_STATE_ONLINE;
 936         /* Call the handler. */
 937         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 938                 /* Start delayed path verification. */
 939                 ccw_device_online_verify(cdev, 0);
 940 }
 941
 942 static void
 943 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 944 {
 945         struct irb *irb;
 946
 947         irb = (struct irb *) __LC_IRB;
 948         /* Accumulate status. We don't do basic sense. */
 949         ccw_device_accumulate_irb(cdev, irb);
 950         /* Remember to clear irb to avoid residuals. */
 951         memset(&cdev->private->irb, 0, sizeof(struct irb));
 952         /* Try to start delayed device verification. */
 953         ccw_device_online_verify(cdev, 0);
 954         /* Note: Don't call handler for cio initiated clear! */
 955 }
 956
 957 static void
 958 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
 959 {
 960         struct subchannel *sch;
 961
 962         sch = to_subchannel(cdev->dev.parent);
 963         ccw_device_set_timeout(cdev, 0);
 964         /* Start delayed path verification. */
 965         ccw_device_online_verify(cdev, 0);
 966         /* OK, i/o is dead now. Call interrupt handler. */
 967         if (cdev->handler)
 968                 cdev->handler(cdev, cdev->private->intparm,
 969                               ERR_PTR(-EIO));
 970 }
 971
 972 static void
 973 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 974 {
 975         int ret;
 976
 977         ret = ccw_device_cancel_halt_clear(cdev);
 978         if (ret == -EBUSY) {
 979                 ccw_device_set_timeout(cdev, 3*HZ);
 980                 return;
 981         }
 982         /* Start delayed path verification. */
 983         ccw_device_online_verify(cdev, 0);
 984         if (cdev->handler)
 985                 cdev->handler(cdev, cdev->private->intparm,
 986                               ERR_PTR(-EIO));
 987 }
 988
 989 void device_kill_io(struct subchannel *sch)
 990 {
 991         int ret;
 992         struct ccw_device *cdev;
 993
 994         cdev = sch_get_cdev(sch);
 995         ret = ccw_device_cancel_halt_clear(cdev);
 996         if (ret == -EBUSY) {
 997                 ccw_device_set_timeout(cdev, 3*HZ);
 998                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 999                 return;
1000         }
1001         /* Start delayed path verification. */
1002         ccw_device_online_verify(cdev, 0);
1003         if (cdev->handler)
1004                 cdev->handler(cdev, cdev->private->intparm,
1005                               ERR_PTR(-EIO));
1006 }
1007
1008 static void
1009 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
1010 {
1011         /* Start verification after current task finished. */
1012         cdev->private->flags.doverify = 1;
1013 }
1014
1015 static void
1016 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1017 {
1018         struct irb *irb;
1019
1020         switch (dev_event) {
1021         case DEV_EVENT_INTERRUPT:
1022                 irb = (struct irb *) __LC_IRB;
1023                 /* Check for unsolicited interrupt. */
1024                 if ((irb->scsw.stctl ==
1025                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1026                     (!irb->scsw.cc))
1027                         /* FIXME: we should restart stlck here, but this
1028                          * is extremely unlikely ... */
1029                         goto out_wakeup;
1030
1031                 ccw_device_accumulate_irb(cdev, irb);
1032                 /* We don't care about basic sense etc. */
1033                 break;
1034         default: /* timeout */
1035                 break;
1036         }
1037 out_wakeup:
1038         wake_up(&cdev->private->wait_q);
1039 }
1040
1041 static void
1042 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1043 {
1044         struct subchannel *sch;
1045
1046         sch = to_subchannel(cdev->dev.parent);
1047         if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0)
1048                 /* Couldn't enable the subchannel for i/o. Sick device. */
1049                 return;
1050
1051         /* After 60s the device recognition is considered to have failed. */
1052         ccw_device_set_timeout(cdev, 60*HZ);
1053
1054         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1055         ccw_device_sense_id_start(cdev);
1056 }
1057
1058 void
1059 device_trigger_reprobe(struct subchannel *sch)
1060 {
1061         struct ccw_device *cdev;
1062
1063         cdev = sch_get_cdev(sch);
1064         if (!cdev)
1065                 return;
1066         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1067                 return;
1068
1069         /* Update some values. */
1070         if (stsch(sch->schid, &sch->schib))
1071                 return;
1072         if (!sch->schib.pmcw.dnv)
1073                 return;
1074         /*
1075          * The pim, pam, pom values may not be accurate, but they are the best
1076          * we have before performing device selection :/
1077          */
1078         sch->lpm = sch->schib.pmcw.pam & sch->opm;
1079         /* Re-set some bits in the pmcw that were lost. */
1080         sch->schib.pmcw.csense = 1;
1081         sch->schib.pmcw.ena = 0;
1082         if ((sch->lpm & (sch->lpm - 1)) != 0)
1083                 sch->schib.pmcw.mp = 1;
1084         sch->schib.pmcw.intparm = (u32)(addr_t)sch;
1085         /* We should also udate ssd info, but this has to wait. */
1086         /* Check if this is another device which appeared on the same sch. */
1087         if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1088                 PREPARE_WORK(&cdev->private->kick_work,
1089                              ccw_device_move_to_orphanage);
1090                 queue_work(slow_path_wq, &cdev->private->kick_work);
1091         } else
1092                 ccw_device_start_id(cdev, 0);
1093 }
1094
1095 static void
1096 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1097 {
1098         struct subchannel *sch;
1099
1100         sch = to_subchannel(cdev->dev.parent);
1101         /*
1102          * An interrupt in state offline means a previous disable was not
1103          * successful. Try again.
1104          */
1105         cio_disable_subchannel(sch);
1106 }
1107
1108 static void
1109 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1110 {
1111         retry_set_schib(cdev);
1112         cdev->private->state = DEV_STATE_ONLINE;
1113         dev_fsm_event(cdev, dev_event);
1114 }
1115
1116 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1117                                        enum dev_event dev_event)
1118 {
1119         cmf_retry_copy_block(cdev);
1120         cdev->private->state = DEV_STATE_ONLINE;
1121         dev_fsm_event(cdev, dev_event);
1122 }
1123
1124 static void
1125 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1126 {
1127         ccw_device_set_timeout(cdev, 0);
1128         if (dev_event == DEV_EVENT_NOTOPER)
1129                 cdev->private->state = DEV_STATE_NOT_OPER;
1130         else
1131                 cdev->private->state = DEV_STATE_OFFLINE;
1132         wake_up(&cdev->private->wait_q);
1133 }
1134
1135 static void
1136 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1137 {
1138         int ret;
1139
1140         ret = ccw_device_cancel_halt_clear(cdev);
1141         switch (ret) {
1142         case 0:
1143                 cdev->private->state = DEV_STATE_OFFLINE;
1144                 wake_up(&cdev->private->wait_q);
1145                 break;
1146         case -ENODEV:
1147                 cdev->private->state = DEV_STATE_NOT_OPER;
1148                 wake_up(&cdev->private->wait_q);
1149                 break;
1150         default:
1151                 ccw_device_set_timeout(cdev, HZ/10);
1152         }
1153 }
1154
1155 /*
1156  * No operation action. This is used e.g. to ignore a timeout event in
1157  * state offline.
1158  */
1159 static void
1160 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1161 {
1162 }
1163
1164 /*
1165  * Bug operation action.
1166  */
1167 static void
1168 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1169 {
1170         CIO_MSG_EVENT(0, "Internal state [%i][%i] not handled for device "
1171                       "0.%x.%04x\n", cdev->private->state, dev_event,
1172                       cdev->private->dev_id.ssid,
1173                       cdev->private->dev_id.devno);
1174         BUG();
1175 }
1176
1177 /*
1178  * device statemachine
1179  */
1180 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1181         [DEV_STATE_NOT_OPER] = {
1182                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1183                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1184                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1185                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1186         },
1187         [DEV_STATE_SENSE_PGID] = {
1188                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1189                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1190                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1191                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1192         },
1193         [DEV_STATE_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_OFFLINE] = {
1200                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1201                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1202                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1203                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1204         },
1205         [DEV_STATE_VERIFY] = {
1206                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1207                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1208                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1209                 [DEV_EVENT_VERIFY]      = ccw_device_delay_verify,
1210         },
1211         [DEV_STATE_ONLINE] = {
1212                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1213                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1214                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1215                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1216         },
1217         [DEV_STATE_W4SENSE] = {
1218                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1219                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1220                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1221                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1222         },
1223         [DEV_STATE_DISBAND_PGID] = {
1224                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1225                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1226                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1227                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1228         },
1229         [DEV_STATE_BOXED] = {
1230                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1231                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1232                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1233                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1234         },
1235         /* states to wait for i/o completion before doing something */
1236         [DEV_STATE_CLEAR_VERIFY] = {
1237                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1238                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1239                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1240                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1241         },
1242         [DEV_STATE_TIMEOUT_KILL] = {
1243                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1244                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1245                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1246                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1247         },
1248         [DEV_STATE_QUIESCE] = {
1249                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1250                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1251                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1252                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1253         },
1254         /* special states for devices gone not operational */
1255         [DEV_STATE_DISCONNECTED] = {
1256                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1257                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1258                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1259                 [DEV_EVENT_VERIFY]      = ccw_device_start_id,
1260         },
1261         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1262                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1263                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1264                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1265                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1266         },
1267         [DEV_STATE_CMFCHANGE] = {
1268                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1269                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1270                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1271                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1272         },
1273         [DEV_STATE_CMFUPDATE] = {
1274                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1275                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1276                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1277                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1278         },
1279 };
1280
1281 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);