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 int
  29 device_is_online(struct subchannel *sch)
  30 {
  31         struct ccw_device *cdev;
  32
  33         if (!sch->dev.driver_data)
  34                 return 0;
  35         cdev = sch->dev.driver_data;
  36         return (cdev->private->state == DEV_STATE_ONLINE);
  37 }
  38
  39 int
  40 device_is_disconnected(struct subchannel *sch)
  41 {
  42         struct ccw_device *cdev;
  43
  44         if (!sch->dev.driver_data)
  45                 return 0;
  46         cdev = sch->dev.driver_data;
  47         return (cdev->private->state == DEV_STATE_DISCONNECTED ||
  48                 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
  49 }
  50
  51 void
  52 device_set_disconnected(struct subchannel *sch)
  53 {
  54         struct ccw_device *cdev;
  55
  56         if (!sch->dev.driver_data)
  57                 return;
  58         cdev = sch->dev.driver_data;
  59         ccw_device_set_timeout(cdev, 0);
  60         cdev->private->flags.fake_irb = 0;
  61         cdev->private->state = DEV_STATE_DISCONNECTED;
  62 }
  63
  64 void device_set_intretry(struct subchannel *sch)
  65 {
  66         struct ccw_device *cdev;
  67
  68         cdev = sch->dev.driver_data;
  69         if (!cdev)
  70                 return;
  71         cdev->private->flags.intretry = 1;
  72 }
  73
  74 int device_trigger_verify(struct subchannel *sch)
  75 {
  76         struct ccw_device *cdev;
  77
  78         cdev = sch->dev.driver_data;
  79         if (!cdev || !cdev->online)
  80                 return -EINVAL;
  81         dev_fsm_event(cdev, DEV_EVENT_VERIFY);
  82         return 0;
  83 }
  84
  85 /*
  86  * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
  87  */
  88 static void
  89 ccw_device_timeout(unsigned long data)
  90 {
  91         struct ccw_device *cdev;
  92
  93         cdev = (struct ccw_device *) data;
  94         spin_lock_irq(cdev->ccwlock);
  95         dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
  96         spin_unlock_irq(cdev->ccwlock);
  97 }
  98
  99 /*
 100  * Set timeout
 101  */
 102 void
 103 ccw_device_set_timeout(struct ccw_device *cdev, int expires)
 104 {
 105         if (expires == 0) {
 106                 del_timer(&cdev->private->timer);
 107                 return;
 108         }
 109         if (timer_pending(&cdev->private->timer)) {
 110                 if (mod_timer(&cdev->private->timer, jiffies + expires))
 111                         return;
 112         }
 113         cdev->private->timer.function = ccw_device_timeout;
 114         cdev->private->timer.data = (unsigned long) cdev;
 115         cdev->private->timer.expires = jiffies + expires;
 116         add_timer(&cdev->private->timer);
 117 }
 118
 119 /* Kill any pending timers after machine check. */
 120 void
 121 device_kill_pending_timer(struct subchannel *sch)
 122 {
 123         struct ccw_device *cdev;
 124
 125         if (!sch->dev.driver_data)
 126                 return;
 127         cdev = sch->dev.driver_data;
 128         ccw_device_set_timeout(cdev, 0);
 129 }
 130
 131 /*
 132  * Cancel running i/o. This is called repeatedly since halt/clear are
 133  * asynchronous operations. We do one try with cio_cancel, two tries
 134  * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
 135  * Returns 0 if device now idle, -ENODEV for device not operational and
 136  * -EBUSY if an interrupt is expected (either from halt/clear or from a
 137  * status pending).
 138  */
 139 int
 140 ccw_device_cancel_halt_clear(struct ccw_device *cdev)
 141 {
 142         struct subchannel *sch;
 143         int ret;
 144
 145         sch = to_subchannel(cdev->dev.parent);
 146         ret = stsch(sch->schid, &sch->schib);
 147         if (ret || !sch->schib.pmcw.dnv)
 148                 return -ENODEV;
 149         if (!sch->schib.pmcw.ena)
 150                 /* Not operational -> done. */
 151                 return 0;
 152         /* Stage 1: cancel io. */
 153         if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) &&
 154             !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
 155                 ret = cio_cancel(sch);
 156                 if (ret != -EINVAL)
 157                         return ret;
 158                 /* cancel io unsuccessful. From now on it is asynchronous. */
 159                 cdev->private->iretry = 3;      /* 3 halt retries. */
 160         }
 161         if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
 162                 /* Stage 2: halt io. */
 163                 if (cdev->private->iretry) {
 164                         cdev->private->iretry--;
 165                         ret = cio_halt(sch);
 166                         if (ret != -EBUSY)
 167                                 return (ret == 0) ? -EBUSY : ret;
 168                 }
 169                 /* halt io unsuccessful. */
 170                 cdev->private->iretry = 255;    /* 255 clear retries. */
 171         }
 172         /* Stage 3: clear io. */
 173         if (cdev->private->iretry) {
 174                 cdev->private->iretry--;
 175                 ret = cio_clear (sch);
 176                 return (ret == 0) ? -EBUSY : ret;
 177         }
 178         panic("Can't stop i/o on subchannel.\n");
 179 }
 180
 181 static int
 182 ccw_device_handle_oper(struct ccw_device *cdev)
 183 {
 184         struct subchannel *sch;
 185
 186         sch = to_subchannel(cdev->dev.parent);
 187         cdev->private->flags.recog_done = 1;
 188         /*
 189          * Check if cu type and device type still match. If
 190          * not, it is certainly another device and we have to
 191          * de- and re-register.
 192          */
 193         if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
 194             cdev->id.cu_model != cdev->private->senseid.cu_model ||
 195             cdev->id.dev_type != cdev->private->senseid.dev_type ||
 196             cdev->id.dev_model != cdev->private->senseid.dev_model) {
 197                 PREPARE_WORK(&cdev->private->kick_work,
 198                              ccw_device_do_unreg_rereg);
 199                 queue_work(ccw_device_work, &cdev->private->kick_work);
 200                 return 0;
 201         }
 202         cdev->private->flags.donotify = 1;
 203         return 1;
 204 }
 205
 206 /*
 207  * The machine won't give us any notification by machine check if a chpid has
 208  * been varied online on the SE so we have to find out by magic (i. e. driving
 209  * the channel subsystem to device selection and updating our path masks).
 210  */
 211 static void
 212 __recover_lost_chpids(struct subchannel *sch, int old_lpm)
 213 {
 214         int mask, i;
 215         struct chp_id chpid;
 216
 217         chp_id_init(&chpid);
 218         for (i = 0; i<8; i++) {
 219                 mask = 0x80 >> i;
 220                 if (!(sch->lpm & mask))
 221                         continue;
 222                 if (old_lpm & mask)
 223                         continue;
 224                 chpid.id = sch->schib.pmcw.chpid[i];
 225                 if (!chp_is_registered(chpid)) {
 226                         need_rescan = 1;
 227                         queue_work(slow_path_wq, &slow_path_work);
 228                 }
 229         }
 230 }
 231
 232 /*
 233  * Stop device recognition.
 234  */
 235 static void
 236 ccw_device_recog_done(struct ccw_device *cdev, int state)
 237 {
 238         struct subchannel *sch;
 239         int notify, old_lpm, same_dev;
 240
 241         sch = to_subchannel(cdev->dev.parent);
 242
 243         ccw_device_set_timeout(cdev, 0);
 244         cio_disable_subchannel(sch);
 245         /*
 246          * Now that we tried recognition, we have performed device selection
 247          * through ssch() and the path information is up to date.
 248          */
 249         old_lpm = sch->lpm;
 250         stsch(sch->schid, &sch->schib);
 251         sch->lpm = sch->schib.pmcw.pam & sch->opm;
 252         /* Check since device may again have become not operational. */
 253         if (!sch->schib.pmcw.dnv)
 254                 state = DEV_STATE_NOT_OPER;
 255         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
 256                 /* Force reprobe on all chpids. */
 257                 old_lpm = 0;
 258         if (sch->lpm != old_lpm)
 259                 __recover_lost_chpids(sch, old_lpm);
 260         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 261                 if (state == DEV_STATE_NOT_OPER) {
 262                         cdev->private->flags.recog_done = 1;
 263                         cdev->private->state = DEV_STATE_DISCONNECTED;
 264                         return;
 265                 }
 266                 /* Boxed devices don't need extra treatment. */
 267         }
 268         notify = 0;
 269         same_dev = 0; /* Keep the compiler quiet... */
 270         switch (state) {
 271         case DEV_STATE_NOT_OPER:
 272                 CIO_DEBUG(KERN_WARNING, 2,
 273                           "SenseID : unknown device %04x on subchannel "
 274                           "0.%x.%04x\n", cdev->private->dev_id.devno,
 275                           sch->schid.ssid, sch->schid.sch_no);
 276                 break;
 277         case DEV_STATE_OFFLINE:
 278                 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 279                         same_dev = ccw_device_handle_oper(cdev);
 280                         notify = 1;
 281                 }
 282                 /* fill out sense information */
 283                 memset(&cdev->id, 0, sizeof(cdev->id));
 284                 cdev->id.cu_type   = cdev->private->senseid.cu_type;
 285                 cdev->id.cu_model  = cdev->private->senseid.cu_model;
 286                 cdev->id.dev_type  = cdev->private->senseid.dev_type;
 287                 cdev->id.dev_model = cdev->private->senseid.dev_model;
 288                 if (notify) {
 289                         cdev->private->state = DEV_STATE_OFFLINE;
 290                         if (same_dev) {
 291                                 /* Get device online again. */
 292                                 ccw_device_online(cdev);
 293                                 wake_up(&cdev->private->wait_q);
 294                         }
 295                         return;
 296                 }
 297                 /* Issue device info message. */
 298                 CIO_DEBUG(KERN_INFO, 2, "SenseID : device 0.%x.%04x reports: "
 299                           "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
 300                           "%04X/%02X\n",
 301                           cdev->private->dev_id.ssid,
 302                           cdev->private->dev_id.devno,
 303                           cdev->id.cu_type, cdev->id.cu_model,
 304                           cdev->id.dev_type, cdev->id.dev_model);
 305                 break;
 306         case DEV_STATE_BOXED:
 307                 CIO_DEBUG(KERN_WARNING, 2,
 308                           "SenseID : boxed device %04x on subchannel "
 309                           "0.%x.%04x\n", cdev->private->dev_id.devno,
 310                           sch->schid.ssid, sch->schid.sch_no);
 311                 break;
 312         }
 313         cdev->private->state = state;
 314         io_subchannel_recog_done(cdev);
 315         if (state != DEV_STATE_NOT_OPER)
 316                 wake_up(&cdev->private->wait_q);
 317 }
 318
 319 /*
 320  * Function called from device_id.c after sense id has completed.
 321  */
 322 void
 323 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
 324 {
 325         switch (err) {
 326         case 0:
 327                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
 328                 break;
 329         case -ETIME:            /* Sense id stopped by timeout. */
 330                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 331                 break;
 332         default:
 333                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 334                 break;
 335         }
 336 }
 337
 338 static void
 339 ccw_device_oper_notify(struct work_struct *work)
 340 {
 341         struct ccw_device_private *priv;
 342         struct ccw_device *cdev;
 343         struct subchannel *sch;
 344         int ret;
 345         unsigned long flags;
 346
 347         priv = container_of(work, struct ccw_device_private, kick_work);
 348         cdev = priv->cdev;
 349         spin_lock_irqsave(cdev->ccwlock, flags);
 350         sch = to_subchannel(cdev->dev.parent);
 351         if (sch->driver && sch->driver->notify) {
 352                 spin_unlock_irqrestore(cdev->ccwlock, flags);
 353                 ret = sch->driver->notify(&sch->dev, CIO_OPER);
 354                 spin_lock_irqsave(cdev->ccwlock, flags);
 355         } else
 356                 ret = 0;
 357         if (ret) {
 358                 /* Reenable channel measurements, if needed. */
 359                 spin_unlock_irqrestore(cdev->ccwlock, flags);
 360                 cmf_reenable(cdev);
 361                 spin_lock_irqsave(cdev->ccwlock, flags);
 362                 wake_up(&cdev->private->wait_q);
 363         }
 364         spin_unlock_irqrestore(cdev->ccwlock, flags);
 365         if (!ret)
 366                 /* Driver doesn't want device back. */
 367                 ccw_device_do_unreg_rereg(work);
 368 }
 369
 370 /*
 371  * Finished with online/offline processing.
 372  */
 373 static void
 374 ccw_device_done(struct ccw_device *cdev, int state)
 375 {
 376         struct subchannel *sch;
 377
 378         sch = to_subchannel(cdev->dev.parent);
 379
 380         ccw_device_set_timeout(cdev, 0);
 381
 382         if (state != DEV_STATE_ONLINE)
 383                 cio_disable_subchannel(sch);
 384
 385         /* Reset device status. */
 386         memset(&cdev->private->irb, 0, sizeof(struct irb));
 387
 388         cdev->private->state = state;
 389
 390
 391         if (state == DEV_STATE_BOXED)
 392                 CIO_DEBUG(KERN_WARNING, 2,
 393                           "Boxed device %04x on subchannel %04x\n",
 394                           cdev->private->dev_id.devno, sch->schid.sch_no);
 395
 396         if (cdev->private->flags.donotify) {
 397                 cdev->private->flags.donotify = 0;
 398                 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify);
 399                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 400         }
 401         wake_up(&cdev->private->wait_q);
 402
 403         if (css_init_done && state != DEV_STATE_ONLINE)
 404                 put_device (&cdev->dev);
 405 }
 406
 407 static int cmp_pgid(struct pgid *p1, struct pgid *p2)
 408 {
 409         char *c1;
 410         char *c2;
 411
 412         c1 = (char *)p1;
 413         c2 = (char *)p2;
 414
 415         return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
 416 }
 417
 418 static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
 419 {
 420         int i;
 421         int last;
 422
 423         last = 0;
 424         for (i = 0; i < 8; i++) {
 425                 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
 426                         /* No PGID yet */
 427                         continue;
 428                 if (cdev->private->pgid[last].inf.ps.state1 ==
 429                     SNID_STATE1_RESET) {
 430                         /* First non-zero PGID */
 431                         last = i;
 432                         continue;
 433                 }
 434                 if (cmp_pgid(&cdev->private->pgid[i],
 435                              &cdev->private->pgid[last]) == 0)
 436                         /* Non-conflicting PGIDs */
 437                         continue;
 438
 439                 /* PGID mismatch, can't pathgroup. */
 440                 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
 441                               "0.%x.%04x, can't pathgroup\n",
 442                               cdev->private->dev_id.ssid,
 443                               cdev->private->dev_id.devno);
 444                 cdev->private->options.pgroup = 0;
 445                 return;
 446         }
 447         if (cdev->private->pgid[last].inf.ps.state1 ==
 448             SNID_STATE1_RESET)
 449                 /* No previous pgid found */
 450                 memcpy(&cdev->private->pgid[0], &css[0]->global_pgid,
 451                        sizeof(struct pgid));
 452         else
 453                 /* Use existing pgid */
 454                 memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
 455                        sizeof(struct pgid));
 456 }
 457
 458 /*
 459  * Function called from device_pgid.c after sense path ground has completed.
 460  */
 461 void
 462 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
 463 {
 464         struct subchannel *sch;
 465
 466         sch = to_subchannel(cdev->dev.parent);
 467         switch (err) {
 468         case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
 469                 cdev->private->options.pgroup = 0;
 470                 break;
 471         case 0: /* success */
 472         case -EACCES: /* partial success, some paths not operational */
 473                 /* Check if all pgids are equal or 0. */
 474                 __ccw_device_get_common_pgid(cdev);
 475                 break;
 476         case -ETIME:            /* Sense path group id stopped by timeout. */
 477         case -EUSERS:           /* device is reserved for someone else. */
 478                 ccw_device_done(cdev, DEV_STATE_BOXED);
 479                 return;
 480         default:
 481                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 482                 return;
 483         }
 484         /* Start Path Group verification. */
 485         cdev->private->state = DEV_STATE_VERIFY;
 486         cdev->private->flags.doverify = 0;
 487         ccw_device_verify_start(cdev);
 488 }
 489
 490 /*
 491  * Start device recognition.
 492  */
 493 int
 494 ccw_device_recognition(struct ccw_device *cdev)
 495 {
 496         struct subchannel *sch;
 497         int ret;
 498
 499         if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
 500             (cdev->private->state != DEV_STATE_BOXED))
 501                 return -EINVAL;
 502         sch = to_subchannel(cdev->dev.parent);
 503         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 504         if (ret != 0)
 505                 /* Couldn't enable the subchannel for i/o. Sick device. */
 506                 return ret;
 507
 508         /* After 60s the device recognition is considered to have failed. */
 509         ccw_device_set_timeout(cdev, 60*HZ);
 510
 511         /*
 512          * We used to start here with a sense pgid to find out whether a device
 513          * is locked by someone else. Unfortunately, the sense pgid command
 514          * code has other meanings on devices predating the path grouping
 515          * algorithm, so we start with sense id and box the device after an
 516          * timeout (or if sense pgid during path verification detects the device
 517          * is locked, as may happen on newer devices).
 518          */
 519         cdev->private->flags.recog_done = 0;
 520         cdev->private->state = DEV_STATE_SENSE_ID;
 521         ccw_device_sense_id_start(cdev);
 522         return 0;
 523 }
 524
 525 /*
 526  * Handle timeout in device recognition.
 527  */
 528 static void
 529 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 530 {
 531         int ret;
 532
 533         ret = ccw_device_cancel_halt_clear(cdev);
 534         switch (ret) {
 535         case 0:
 536                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 537                 break;
 538         case -ENODEV:
 539                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 540                 break;
 541         default:
 542                 ccw_device_set_timeout(cdev, 3*HZ);
 543         }
 544 }
 545
 546
 547 static void
 548 ccw_device_nopath_notify(struct work_struct *work)
 549 {
 550         struct ccw_device_private *priv;
 551         struct ccw_device *cdev;
 552         struct subchannel *sch;
 553         int ret;
 554         unsigned long flags;
 555
 556         priv = container_of(work, struct ccw_device_private, kick_work);
 557         cdev = priv->cdev;
 558         spin_lock_irqsave(cdev->ccwlock, flags);
 559         sch = to_subchannel(cdev->dev.parent);
 560         /* Extra sanity. */
 561         if (sch->lpm)
 562                 goto out_unlock;
 563         if (sch->driver && sch->driver->notify) {
 564                 spin_unlock_irqrestore(cdev->ccwlock, flags);
 565                 ret = sch->driver->notify(&sch->dev, CIO_NO_PATH);
 566                 spin_lock_irqsave(cdev->ccwlock, flags);
 567         } else
 568                 ret = 0;
 569         if (!ret) {
 570                 if (get_device(&sch->dev)) {
 571                         /* Driver doesn't want to keep device. */
 572                         cio_disable_subchannel(sch);
 573                         if (get_device(&cdev->dev)) {
 574                                 PREPARE_WORK(&cdev->private->kick_work,
 575                                              ccw_device_call_sch_unregister);
 576                                 queue_work(ccw_device_work,
 577                                            &cdev->private->kick_work);
 578                         } else
 579                                 put_device(&sch->dev);
 580                 }
 581         } else {
 582                 cio_disable_subchannel(sch);
 583                 ccw_device_set_timeout(cdev, 0);
 584                 cdev->private->flags.fake_irb = 0;
 585                 cdev->private->state = DEV_STATE_DISCONNECTED;
 586                 wake_up(&cdev->private->wait_q);
 587         }
 588 out_unlock:
 589         spin_unlock_irqrestore(cdev->ccwlock, flags);
 590 }
 591
 592 void
 593 ccw_device_verify_done(struct ccw_device *cdev, int err)
 594 {
 595         struct subchannel *sch;
 596
 597         sch = to_subchannel(cdev->dev.parent);
 598         /* Update schib - pom may have changed. */
 599         stsch(sch->schid, &sch->schib);
 600         /* Update lpm with verified path mask. */
 601         sch->lpm = sch->vpm;
 602         /* Repeat path verification? */
 603         if (cdev->private->flags.doverify) {
 604                 cdev->private->flags.doverify = 0;
 605                 ccw_device_verify_start(cdev);
 606                 return;
 607         }
 608         switch (err) {
 609         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 610                 cdev->private->options.pgroup = 0;
 611         case 0:
 612                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 613                 /* Deliver fake irb to device driver, if needed. */
 614                 if (cdev->private->flags.fake_irb) {
 615                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 616                         cdev->private->irb.scsw.cc = 1;
 617                         cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC;
 618                         cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND;
 619                         cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND;
 620                         cdev->private->flags.fake_irb = 0;
 621                         if (cdev->handler)
 622                                 cdev->handler(cdev, cdev->private->intparm,
 623                                               &cdev->private->irb);
 624                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 625                 }
 626                 break;
 627         case -ETIME:
 628                 /* Reset oper notify indication after verify error. */
 629                 cdev->private->flags.donotify = 0;
 630                 ccw_device_done(cdev, DEV_STATE_BOXED);
 631                 break;
 632         default:
 633                 /* Reset oper notify indication after verify error. */
 634                 cdev->private->flags.donotify = 0;
 635                 if (cdev->online) {
 636                         PREPARE_WORK(&cdev->private->kick_work,
 637                                      ccw_device_nopath_notify);
 638                         queue_work(ccw_device_notify_work,
 639                                    &cdev->private->kick_work);
 640                 } else
 641                         ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 642                 break;
 643         }
 644 }
 645
 646 /*
 647  * Get device online.
 648  */
 649 int
 650 ccw_device_online(struct ccw_device *cdev)
 651 {
 652         struct subchannel *sch;
 653         int ret;
 654
 655         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 656             (cdev->private->state != DEV_STATE_BOXED))
 657                 return -EINVAL;
 658         sch = to_subchannel(cdev->dev.parent);
 659         if (css_init_done && !get_device(&cdev->dev))
 660                 return -ENODEV;
 661         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 662         if (ret != 0) {
 663                 /* Couldn't enable the subchannel for i/o. Sick device. */
 664                 if (ret == -ENODEV)
 665                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 666                 return ret;
 667         }
 668         /* Do we want to do path grouping? */
 669         if (!cdev->private->options.pgroup) {
 670                 /* Start initial path verification. */
 671                 cdev->private->state = DEV_STATE_VERIFY;
 672                 cdev->private->flags.doverify = 0;
 673                 ccw_device_verify_start(cdev);
 674                 return 0;
 675         }
 676         /* Do a SensePGID first. */
 677         cdev->private->state = DEV_STATE_SENSE_PGID;
 678         ccw_device_sense_pgid_start(cdev);
 679         return 0;
 680 }
 681
 682 void
 683 ccw_device_disband_done(struct ccw_device *cdev, int err)
 684 {
 685         switch (err) {
 686         case 0:
 687                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 688                 break;
 689         case -ETIME:
 690                 ccw_device_done(cdev, DEV_STATE_BOXED);
 691                 break;
 692         default:
 693                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 694                 break;
 695         }
 696 }
 697
 698 /*
 699  * Shutdown device.
 700  */
 701 int
 702 ccw_device_offline(struct ccw_device *cdev)
 703 {
 704         struct subchannel *sch;
 705
 706         if (ccw_device_is_orphan(cdev)) {
 707                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 708                 return 0;
 709         }
 710         sch = to_subchannel(cdev->dev.parent);
 711         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
 712                 return -ENODEV;
 713         if (cdev->private->state != DEV_STATE_ONLINE) {
 714                 if (sch->schib.scsw.actl != 0)
 715                         return -EBUSY;
 716                 return -EINVAL;
 717         }
 718         if (sch->schib.scsw.actl != 0)
 719                 return -EBUSY;
 720         /* Are we doing path grouping? */
 721         if (!cdev->private->options.pgroup) {
 722                 /* No, set state offline immediately. */
 723                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 724                 return 0;
 725         }
 726         /* Start Set Path Group commands. */
 727         cdev->private->state = DEV_STATE_DISBAND_PGID;
 728         ccw_device_disband_start(cdev);
 729         return 0;
 730 }
 731
 732 /*
 733  * Handle timeout in device online/offline process.
 734  */
 735 static void
 736 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 737 {
 738         int ret;
 739
 740         ret = ccw_device_cancel_halt_clear(cdev);
 741         switch (ret) {
 742         case 0:
 743                 ccw_device_done(cdev, DEV_STATE_BOXED);
 744                 break;
 745         case -ENODEV:
 746                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 747                 break;
 748         default:
 749                 ccw_device_set_timeout(cdev, 3*HZ);
 750         }
 751 }
 752
 753 /*
 754  * Handle not oper event in device recognition.
 755  */
 756 static void
 757 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 758 {
 759         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 760 }
 761
 762 /*
 763  * Handle not operational event while offline.
 764  */
 765 static void
 766 ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 767 {
 768         struct subchannel *sch;
 769
 770         cdev->private->state = DEV_STATE_NOT_OPER;
 771         sch = to_subchannel(cdev->dev.parent);
 772         if (get_device(&cdev->dev)) {
 773                 PREPARE_WORK(&cdev->private->kick_work,
 774                              ccw_device_call_sch_unregister);
 775                 queue_work(ccw_device_work, &cdev->private->kick_work);
 776         }
 777         wake_up(&cdev->private->wait_q);
 778 }
 779
 780 /*
 781  * Handle not operational event while online.
 782  */
 783 static void
 784 ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 785 {
 786         struct subchannel *sch;
 787         int ret;
 788
 789         sch = to_subchannel(cdev->dev.parent);
 790         if (sch->driver->notify) {
 791                 spin_unlock_irq(cdev->ccwlock);
 792                 ret = sch->driver->notify(&sch->dev,
 793                                           sch->lpm ? CIO_GONE : CIO_NO_PATH);
 794                 spin_lock_irq(cdev->ccwlock);
 795         } else
 796                 ret = 0;
 797         if (ret) {
 798                 ccw_device_set_timeout(cdev, 0);
 799                 cdev->private->flags.fake_irb = 0;
 800                 cdev->private->state = DEV_STATE_DISCONNECTED;
 801                 wake_up(&cdev->private->wait_q);
 802                 return;
 803         }
 804         cdev->private->state = DEV_STATE_NOT_OPER;
 805         cio_disable_subchannel(sch);
 806         if (sch->schib.scsw.actl != 0) {
 807                 // FIXME: not-oper indication to device driver ?
 808                 ccw_device_call_handler(cdev);
 809         }
 810         if (get_device(&cdev->dev)) {
 811                 PREPARE_WORK(&cdev->private->kick_work,
 812                              ccw_device_call_sch_unregister);
 813                 queue_work(ccw_device_work, &cdev->private->kick_work);
 814         }
 815         wake_up(&cdev->private->wait_q);
 816 }
 817
 818 /*
 819  * Handle path verification event.
 820  */
 821 static void
 822 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 823 {
 824         struct subchannel *sch;
 825
 826         if (cdev->private->state == DEV_STATE_W4SENSE) {
 827                 cdev->private->flags.doverify = 1;
 828                 return;
 829         }
 830         sch = to_subchannel(cdev->dev.parent);
 831         /*
 832          * Since we might not just be coming from an interrupt from the
 833          * subchannel we have to update the schib.
 834          */
 835         stsch(sch->schid, &sch->schib);
 836
 837         if (sch->schib.scsw.actl != 0 ||
 838             (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) ||
 839             (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
 840                 /*
 841                  * No final status yet or final status not yet delivered
 842                  * to the device driver. Can't do path verfication now,
 843                  * delay until final status was delivered.
 844                  */
 845                 cdev->private->flags.doverify = 1;
 846                 return;
 847         }
 848         /* Device is idle, we can do the path verification. */
 849         cdev->private->state = DEV_STATE_VERIFY;
 850         cdev->private->flags.doverify = 0;
 851         ccw_device_verify_start(cdev);
 852 }
 853
 854 /*
 855  * Got an interrupt for a normal io (state online).
 856  */
 857 static void
 858 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 859 {
 860         struct irb *irb;
 861
 862         irb = (struct irb *) __LC_IRB;
 863         /* Check for unsolicited interrupt. */
 864         if ((irb->scsw.stctl ==
 865                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
 866             && (!irb->scsw.cc)) {
 867                 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 868                     !irb->esw.esw0.erw.cons) {
 869                         /* Unit check but no sense data. Need basic sense. */
 870                         if (ccw_device_do_sense(cdev, irb) != 0)
 871                                 goto call_handler_unsol;
 872                         memcpy(&cdev->private->irb, irb, sizeof(struct irb));
 873                         cdev->private->state = DEV_STATE_W4SENSE;
 874                         cdev->private->intparm = 0;
 875                         return;
 876                 }
 877 call_handler_unsol:
 878                 if (cdev->handler)
 879                         cdev->handler (cdev, 0, irb);
 880                 if (cdev->private->flags.doverify)
 881                         ccw_device_online_verify(cdev, 0);
 882                 return;
 883         }
 884         /* Accumulate status and find out if a basic sense is needed. */
 885         ccw_device_accumulate_irb(cdev, irb);
 886         if (cdev->private->flags.dosense) {
 887                 if (ccw_device_do_sense(cdev, irb) == 0) {
 888                         cdev->private->state = DEV_STATE_W4SENSE;
 889                 }
 890                 return;
 891         }
 892         /* Call the handler. */
 893         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 894                 /* Start delayed path verification. */
 895                 ccw_device_online_verify(cdev, 0);
 896 }
 897
 898 /*
 899  * Got an timeout in online state.
 900  */
 901 static void
 902 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 903 {
 904         int ret;
 905
 906         ccw_device_set_timeout(cdev, 0);
 907         ret = ccw_device_cancel_halt_clear(cdev);
 908         if (ret == -EBUSY) {
 909                 ccw_device_set_timeout(cdev, 3*HZ);
 910                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 911                 return;
 912         }
 913         if (ret == -ENODEV) {
 914                 struct subchannel *sch;
 915
 916                 sch = to_subchannel(cdev->dev.parent);
 917                 if (!sch->lpm) {
 918                         PREPARE_WORK(&cdev->private->kick_work,
 919                                      ccw_device_nopath_notify);
 920                         queue_work(ccw_device_notify_work,
 921                                    &cdev->private->kick_work);
 922                 } else
 923                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 924         } else if (cdev->handler)
 925                 cdev->handler(cdev, cdev->private->intparm,
 926                               ERR_PTR(-ETIMEDOUT));
 927 }
 928
 929 /*
 930  * Got an interrupt for a basic sense.
 931  */
 932 static void
 933 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 934 {
 935         struct irb *irb;
 936
 937         irb = (struct irb *) __LC_IRB;
 938         /* Check for unsolicited interrupt. */
 939         if (irb->scsw.stctl ==
 940                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 941                 if (irb->scsw.cc == 1)
 942                         /* Basic sense hasn't started. Try again. */
 943                         ccw_device_do_sense(cdev, irb);
 944                 else {
 945                         printk(KERN_INFO "Huh? %s(%s): unsolicited "
 946                                "interrupt...\n",
 947                                __FUNCTION__, cdev->dev.bus_id);
 948                         if (cdev->handler)
 949                                 cdev->handler (cdev, 0, irb);
 950                 }
 951                 return;
 952         }
 953         /*
 954          * Check if a halt or clear has been issued in the meanwhile. If yes,
 955          * only deliver the halt/clear interrupt to the device driver as if it
 956          * had killed the original request.
 957          */
 958         if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
 959                 /* Retry Basic Sense if requested. */
 960                 if (cdev->private->flags.intretry) {
 961                         cdev->private->flags.intretry = 0;
 962                         ccw_device_do_sense(cdev, irb);
 963                         return;
 964                 }
 965                 cdev->private->flags.dosense = 0;
 966                 memset(&cdev->private->irb, 0, sizeof(struct irb));
 967                 ccw_device_accumulate_irb(cdev, irb);
 968                 goto call_handler;
 969         }
 970         /* Add basic sense info to irb. */
 971         ccw_device_accumulate_basic_sense(cdev, irb);
 972         if (cdev->private->flags.dosense) {
 973                 /* Another basic sense is needed. */
 974                 ccw_device_do_sense(cdev, irb);
 975                 return;
 976         }
 977 call_handler:
 978         cdev->private->state = DEV_STATE_ONLINE;
 979         /* Call the handler. */
 980         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 981                 /* Start delayed path verification. */
 982                 ccw_device_online_verify(cdev, 0);
 983 }
 984
 985 static void
 986 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 987 {
 988         struct irb *irb;
 989
 990         irb = (struct irb *) __LC_IRB;
 991         /* Accumulate status. We don't do basic sense. */
 992         ccw_device_accumulate_irb(cdev, irb);
 993         /* Remember to clear irb to avoid residuals. */
 994         memset(&cdev->private->irb, 0, sizeof(struct irb));
 995         /* Try to start delayed device verification. */
 996         ccw_device_online_verify(cdev, 0);
 997         /* Note: Don't call handler for cio initiated clear! */
 998 }
 999
1000 static void
1001 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
1002 {
1003         struct subchannel *sch;
1004
1005         sch = to_subchannel(cdev->dev.parent);
1006         ccw_device_set_timeout(cdev, 0);
1007         /* Start delayed path verification. */
1008         ccw_device_online_verify(cdev, 0);
1009         /* OK, i/o is dead now. Call interrupt handler. */
1010         if (cdev->handler)
1011                 cdev->handler(cdev, cdev->private->intparm,
1012                               ERR_PTR(-EIO));
1013 }
1014
1015 static void
1016 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1017 {
1018         int ret;
1019
1020         ret = ccw_device_cancel_halt_clear(cdev);
1021         if (ret == -EBUSY) {
1022                 ccw_device_set_timeout(cdev, 3*HZ);
1023                 return;
1024         }
1025         /* Start delayed path verification. */
1026         ccw_device_online_verify(cdev, 0);
1027         if (cdev->handler)
1028                 cdev->handler(cdev, cdev->private->intparm,
1029                               ERR_PTR(-EIO));
1030 }
1031
1032 void device_kill_io(struct subchannel *sch)
1033 {
1034         int ret;
1035         struct ccw_device *cdev;
1036
1037         cdev = sch->dev.driver_data;
1038         ret = ccw_device_cancel_halt_clear(cdev);
1039         if (ret == -EBUSY) {
1040                 ccw_device_set_timeout(cdev, 3*HZ);
1041                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
1042                 return;
1043         }
1044         /* Start delayed path verification. */
1045         ccw_device_online_verify(cdev, 0);
1046         if (cdev->handler)
1047                 cdev->handler(cdev, cdev->private->intparm,
1048                               ERR_PTR(-EIO));
1049 }
1050
1051 static void
1052 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
1053 {
1054         /* Start verification after current task finished. */
1055         cdev->private->flags.doverify = 1;
1056 }
1057
1058 static void
1059 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1060 {
1061         struct irb *irb;
1062
1063         switch (dev_event) {
1064         case DEV_EVENT_INTERRUPT:
1065                 irb = (struct irb *) __LC_IRB;
1066                 /* Check for unsolicited interrupt. */
1067                 if ((irb->scsw.stctl ==
1068                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1069                     (!irb->scsw.cc))
1070                         /* FIXME: we should restart stlck here, but this
1071                          * is extremely unlikely ... */
1072                         goto out_wakeup;
1073
1074                 ccw_device_accumulate_irb(cdev, irb);
1075                 /* We don't care about basic sense etc. */
1076                 break;
1077         default: /* timeout */
1078                 break;
1079         }
1080 out_wakeup:
1081         wake_up(&cdev->private->wait_q);
1082 }
1083
1084 static void
1085 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1086 {
1087         struct subchannel *sch;
1088
1089         sch = to_subchannel(cdev->dev.parent);
1090         if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1091                 /* Couldn't enable the subchannel for i/o. Sick device. */
1092                 return;
1093
1094         /* After 60s the device recognition is considered to have failed. */
1095         ccw_device_set_timeout(cdev, 60*HZ);
1096
1097         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1098         ccw_device_sense_id_start(cdev);
1099 }
1100
1101 void
1102 device_trigger_reprobe(struct subchannel *sch)
1103 {
1104         struct ccw_device *cdev;
1105
1106         if (!sch->dev.driver_data)
1107                 return;
1108         cdev = sch->dev.driver_data;
1109         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1110                 return;
1111
1112         /* Update some values. */
1113         if (stsch(sch->schid, &sch->schib))
1114                 return;
1115         if (!sch->schib.pmcw.dnv)
1116                 return;
1117         /*
1118          * The pim, pam, pom values may not be accurate, but they are the best
1119          * we have before performing device selection :/
1120          */
1121         sch->lpm = sch->schib.pmcw.pam & sch->opm;
1122         /* Re-set some bits in the pmcw that were lost. */
1123         sch->schib.pmcw.isc = 3;
1124         sch->schib.pmcw.csense = 1;
1125         sch->schib.pmcw.ena = 0;
1126         if ((sch->lpm & (sch->lpm - 1)) != 0)
1127                 sch->schib.pmcw.mp = 1;
1128         sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1129         /* We should also udate ssd info, but this has to wait. */
1130         /* Check if this is another device which appeared on the same sch. */
1131         if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1132                 PREPARE_WORK(&cdev->private->kick_work,
1133                              ccw_device_move_to_orphanage);
1134                 queue_work(ccw_device_work, &cdev->private->kick_work);
1135         } else
1136                 ccw_device_start_id(cdev, 0);
1137 }
1138
1139 static void
1140 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1141 {
1142         struct subchannel *sch;
1143
1144         sch = to_subchannel(cdev->dev.parent);
1145         /*
1146          * An interrupt in state offline means a previous disable was not
1147          * successful. Try again.
1148          */
1149         cio_disable_subchannel(sch);
1150 }
1151
1152 static void
1153 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1154 {
1155         retry_set_schib(cdev);
1156         cdev->private->state = DEV_STATE_ONLINE;
1157         dev_fsm_event(cdev, dev_event);
1158 }
1159
1160 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1161                                        enum dev_event dev_event)
1162 {
1163         cmf_retry_copy_block(cdev);
1164         cdev->private->state = DEV_STATE_ONLINE;
1165         dev_fsm_event(cdev, dev_event);
1166 }
1167
1168 static void
1169 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1170 {
1171         ccw_device_set_timeout(cdev, 0);
1172         if (dev_event == DEV_EVENT_NOTOPER)
1173                 cdev->private->state = DEV_STATE_NOT_OPER;
1174         else
1175                 cdev->private->state = DEV_STATE_OFFLINE;
1176         wake_up(&cdev->private->wait_q);
1177 }
1178
1179 static void
1180 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1181 {
1182         int ret;
1183
1184         ret = ccw_device_cancel_halt_clear(cdev);
1185         switch (ret) {
1186         case 0:
1187                 cdev->private->state = DEV_STATE_OFFLINE;
1188                 wake_up(&cdev->private->wait_q);
1189                 break;
1190         case -ENODEV:
1191                 cdev->private->state = DEV_STATE_NOT_OPER;
1192                 wake_up(&cdev->private->wait_q);
1193                 break;
1194         default:
1195                 ccw_device_set_timeout(cdev, HZ/10);
1196         }
1197 }
1198
1199 /*
1200  * No operation action. This is used e.g. to ignore a timeout event in
1201  * state offline.
1202  */
1203 static void
1204 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1205 {
1206 }
1207
1208 /*
1209  * Bug operation action.
1210  */
1211 static void
1212 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1213 {
1214         printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
1215                cdev->private->state, dev_event);
1216         BUG();
1217 }
1218
1219 /*
1220  * device statemachine
1221  */
1222 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1223         [DEV_STATE_NOT_OPER] = {
1224                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1225                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1226                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1227                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1228         },
1229         [DEV_STATE_SENSE_PGID] = {
1230                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1231                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1232                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1233                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1234         },
1235         [DEV_STATE_SENSE_ID] = {
1236                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1237                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1238                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1239                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1240         },
1241         [DEV_STATE_OFFLINE] = {
1242                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1243                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1244                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1245                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1246         },
1247         [DEV_STATE_VERIFY] = {
1248                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1249                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1250                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1251                 [DEV_EVENT_VERIFY]      = ccw_device_delay_verify,
1252         },
1253         [DEV_STATE_ONLINE] = {
1254                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1255                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1256                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1257                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1258         },
1259         [DEV_STATE_W4SENSE] = {
1260                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1261                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1262                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1263                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1264         },
1265         [DEV_STATE_DISBAND_PGID] = {
1266                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1267                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1268                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1269                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1270         },
1271         [DEV_STATE_BOXED] = {
1272                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1273                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1274                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1275                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1276         },
1277         /* states to wait for i/o completion before doing something */
1278         [DEV_STATE_CLEAR_VERIFY] = {
1279                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1280                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1281                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1282                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1283         },
1284         [DEV_STATE_TIMEOUT_KILL] = {
1285                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1286                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1287                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1288                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1289         },
1290         [DEV_STATE_QUIESCE] = {
1291                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1292                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1293                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1294                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1295         },
1296         /* special states for devices gone not operational */
1297         [DEV_STATE_DISCONNECTED] = {
1298                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1299                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1300                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1301                 [DEV_EVENT_VERIFY]      = ccw_device_start_id,
1302         },
1303         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1304                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1305                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1306                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1307                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1308         },
1309         [DEV_STATE_CMFCHANGE] = {
1310                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1311                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1312                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1313                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1314         },
1315         [DEV_STATE_CMFUPDATE] = {
1316                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1317                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1318                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1319                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1320         },
1321 };
1322
1323 /*
1324  * io_subchannel_irq is called for "real" interrupts or for status
1325  * pending conditions on msch.
1326  */
1327 void
1328 io_subchannel_irq (struct device *pdev)
1329 {
1330         struct ccw_device *cdev;
1331
1332         cdev = to_subchannel(pdev)->dev.driver_data;
1333
1334         CIO_TRACE_EVENT (3, "IRQ");
1335         CIO_TRACE_EVENT (3, pdev->bus_id);
1336         if (cdev)
1337                 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1338 }
1339
1340 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);