git.oblomov.eu Git - linux-2.6/blob - drivers/s390/cio/device_fsm.c

   1 /*
   2  * drivers/s390/cio/device_fsm.c
   3  * finite state machine for device handling
   4  *
   5  *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
   6  *                       IBM Corporation
   7  *    Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
   8  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/jiffies.h>
  14 #include <linux/string.h>
  15
  16 #include <asm/ccwdev.h>
  17 #include <asm/cio.h>
  18 #include <asm/chpid.h>
  19
  20 #include "cio.h"
  21 #include "cio_debug.h"
  22 #include "css.h"
  23 #include "device.h"
  24 #include "chsc.h"
  25 #include "ioasm.h"
  26 #include "chp.h"
  27
  28 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                         css_schedule_eval_all();
 227         }
 228 }
 229
 230 /*
 231  * Stop device recognition.
 232  */
 233 static void
 234 ccw_device_recog_done(struct ccw_device *cdev, int state)
 235 {
 236         struct subchannel *sch;
 237         int notify, old_lpm, same_dev;
 238
 239         sch = to_subchannel(cdev->dev.parent);
 240
 241         ccw_device_set_timeout(cdev, 0);
 242         cio_disable_subchannel(sch);
 243         /*
 244          * Now that we tried recognition, we have performed device selection
 245          * through ssch() and the path information is up to date.
 246          */
 247         old_lpm = sch->lpm;
 248         stsch(sch->schid, &sch->schib);
 249         sch->lpm = sch->schib.pmcw.pam & sch->opm;
 250         /* Check since device may again have become not operational. */
 251         if (!sch->schib.pmcw.dnv)
 252                 state = DEV_STATE_NOT_OPER;
 253         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
 254                 /* Force reprobe on all chpids. */
 255                 old_lpm = 0;
 256         if (sch->lpm != old_lpm)
 257                 __recover_lost_chpids(sch, old_lpm);
 258         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 259                 if (state == DEV_STATE_NOT_OPER) {
 260                         cdev->private->flags.recog_done = 1;
 261                         cdev->private->state = DEV_STATE_DISCONNECTED;
 262                         return;
 263                 }
 264                 /* Boxed devices don't need extra treatment. */
 265         }
 266         notify = 0;
 267         same_dev = 0; /* Keep the compiler quiet... */
 268         switch (state) {
 269         case DEV_STATE_NOT_OPER:
 270                 CIO_DEBUG(KERN_WARNING, 2,
 271                           "SenseID : unknown device %04x on subchannel "
 272                           "0.%x.%04x\n", cdev->private->dev_id.devno,
 273                           sch->schid.ssid, sch->schid.sch_no);
 274                 break;
 275         case DEV_STATE_OFFLINE:
 276                 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 277                         same_dev = ccw_device_handle_oper(cdev);
 278                         notify = 1;
 279                 }
 280                 /* fill out sense information */
 281                 memset(&cdev->id, 0, sizeof(cdev->id));
 282                 cdev->id.cu_type   = cdev->private->senseid.cu_type;
 283                 cdev->id.cu_model  = cdev->private->senseid.cu_model;
 284                 cdev->id.dev_type  = cdev->private->senseid.dev_type;
 285                 cdev->id.dev_model = cdev->private->senseid.dev_model;
 286                 if (notify) {
 287                         cdev->private->state = DEV_STATE_OFFLINE;
 288                         if (same_dev) {
 289                                 /* Get device online again. */
 290                                 ccw_device_online(cdev);
 291                                 wake_up(&cdev->private->wait_q);
 292                         }
 293                         return;
 294                 }
 295                 /* Issue device info message. */
 296                 CIO_DEBUG(KERN_INFO, 2, "SenseID : device 0.%x.%04x reports: "
 297                           "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
 298                           "%04X/%02X\n",
 299                           cdev->private->dev_id.ssid,
 300                           cdev->private->dev_id.devno,
 301                           cdev->id.cu_type, cdev->id.cu_model,
 302                           cdev->id.dev_type, cdev->id.dev_model);
 303                 break;
 304         case DEV_STATE_BOXED:
 305                 CIO_DEBUG(KERN_WARNING, 2,
 306                           "SenseID : boxed device %04x on subchannel "
 307                           "0.%x.%04x\n", cdev->private->dev_id.devno,
 308                           sch->schid.ssid, sch->schid.sch_no);
 309                 break;
 310         }
 311         cdev->private->state = state;
 312         io_subchannel_recog_done(cdev);
 313         if (state != DEV_STATE_NOT_OPER)
 314                 wake_up(&cdev->private->wait_q);
 315 }
 316
 317 /*
 318  * Function called from device_id.c after sense id has completed.
 319  */
 320 void
 321 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
 322 {
 323         switch (err) {
 324         case 0:
 325                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
 326                 break;
 327         case -ETIME:            /* Sense id stopped by timeout. */
 328                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 329                 break;
 330         default:
 331                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 332                 break;
 333         }
 334 }
 335
 336 static void
 337 ccw_device_oper_notify(struct work_struct *work)
 338 {
 339         struct ccw_device_private *priv;
 340         struct ccw_device *cdev;
 341         struct subchannel *sch;
 342         int ret;
 343         unsigned long flags;
 344
 345         priv = container_of(work, struct ccw_device_private, kick_work);
 346         cdev = priv->cdev;
 347         spin_lock_irqsave(cdev->ccwlock, flags);
 348         sch = to_subchannel(cdev->dev.parent);
 349         if (sch->driver && sch->driver->notify) {
 350                 spin_unlock_irqrestore(cdev->ccwlock, flags);
 351                 ret = sch->driver->notify(&sch->dev, CIO_OPER);
 352                 spin_lock_irqsave(cdev->ccwlock, flags);
 353         } else
 354                 ret = 0;
 355         if (ret) {
 356                 /* Reenable channel measurements, if needed. */
 357                 spin_unlock_irqrestore(cdev->ccwlock, flags);
 358                 cmf_reenable(cdev);
 359                 spin_lock_irqsave(cdev->ccwlock, flags);
 360                 wake_up(&cdev->private->wait_q);
 361         }
 362         spin_unlock_irqrestore(cdev->ccwlock, flags);
 363         if (!ret)
 364                 /* Driver doesn't want device back. */
 365                 ccw_device_do_unreg_rereg(work);
 366 }
 367
 368 /*
 369  * Finished with online/offline processing.
 370  */
 371 static void
 372 ccw_device_done(struct ccw_device *cdev, int state)
 373 {
 374         struct subchannel *sch;
 375
 376         sch = to_subchannel(cdev->dev.parent);
 377
 378         ccw_device_set_timeout(cdev, 0);
 379
 380         if (state != DEV_STATE_ONLINE)
 381                 cio_disable_subchannel(sch);
 382
 383         /* Reset device status. */
 384         memset(&cdev->private->irb, 0, sizeof(struct irb));
 385
 386         cdev->private->state = state;
 387
 388
 389         if (state == DEV_STATE_BOXED)
 390                 CIO_DEBUG(KERN_WARNING, 2,
 391                           "Boxed device %04x on subchannel %04x\n",
 392                           cdev->private->dev_id.devno, sch->schid.sch_no);
 393
 394         if (cdev->private->flags.donotify) {
 395                 cdev->private->flags.donotify = 0;
 396                 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify);
 397                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 398         }
 399         wake_up(&cdev->private->wait_q);
 400
 401         if (css_init_done && state != DEV_STATE_ONLINE)
 402                 put_device (&cdev->dev);
 403 }
 404
 405 static int cmp_pgid(struct pgid *p1, struct pgid *p2)
 406 {
 407         char *c1;
 408         char *c2;
 409
 410         c1 = (char *)p1;
 411         c2 = (char *)p2;
 412
 413         return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
 414 }
 415
 416 static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
 417 {
 418         int i;
 419         int last;
 420
 421         last = 0;
 422         for (i = 0; i < 8; i++) {
 423                 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
 424                         /* No PGID yet */
 425                         continue;
 426                 if (cdev->private->pgid[last].inf.ps.state1 ==
 427                     SNID_STATE1_RESET) {
 428                         /* First non-zero PGID */
 429                         last = i;
 430                         continue;
 431                 }
 432                 if (cmp_pgid(&cdev->private->pgid[i],
 433                              &cdev->private->pgid[last]) == 0)
 434                         /* Non-conflicting PGIDs */
 435                         continue;
 436
 437                 /* PGID mismatch, can't pathgroup. */
 438                 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
 439                               "0.%x.%04x, can't pathgroup\n",
 440                               cdev->private->dev_id.ssid,
 441                               cdev->private->dev_id.devno);
 442                 cdev->private->options.pgroup = 0;
 443                 return;
 444         }
 445         if (cdev->private->pgid[last].inf.ps.state1 ==
 446             SNID_STATE1_RESET)
 447                 /* No previous pgid found */
 448                 memcpy(&cdev->private->pgid[0], &css[0]->global_pgid,
 449                        sizeof(struct pgid));
 450         else
 451                 /* Use existing pgid */
 452                 memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
 453                        sizeof(struct pgid));
 454 }
 455
 456 /*
 457  * Function called from device_pgid.c after sense path ground has completed.
 458  */
 459 void
 460 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
 461 {
 462         struct subchannel *sch;
 463
 464         sch = to_subchannel(cdev->dev.parent);
 465         switch (err) {
 466         case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
 467                 cdev->private->options.pgroup = 0;
 468                 break;
 469         case 0: /* success */
 470         case -EACCES: /* partial success, some paths not operational */
 471                 /* Check if all pgids are equal or 0. */
 472                 __ccw_device_get_common_pgid(cdev);
 473                 break;
 474         case -ETIME:            /* Sense path group id stopped by timeout. */
 475         case -EUSERS:           /* device is reserved for someone else. */
 476                 ccw_device_done(cdev, DEV_STATE_BOXED);
 477                 return;
 478         default:
 479                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 480                 return;
 481         }
 482         /* Start Path Group verification. */
 483         cdev->private->state = DEV_STATE_VERIFY;
 484         cdev->private->flags.doverify = 0;
 485         ccw_device_verify_start(cdev);
 486 }
 487
 488 /*
 489  * Start device recognition.
 490  */
 491 int
 492 ccw_device_recognition(struct ccw_device *cdev)
 493 {
 494         struct subchannel *sch;
 495         int ret;
 496
 497         if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
 498             (cdev->private->state != DEV_STATE_BOXED))
 499                 return -EINVAL;
 500         sch = to_subchannel(cdev->dev.parent);
 501         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 502         if (ret != 0)
 503                 /* Couldn't enable the subchannel for i/o. Sick device. */
 504                 return ret;
 505
 506         /* After 60s the device recognition is considered to have failed. */
 507         ccw_device_set_timeout(cdev, 60*HZ);
 508
 509         /*
 510          * We used to start here with a sense pgid to find out whether a device
 511          * is locked by someone else. Unfortunately, the sense pgid command
 512          * code has other meanings on devices predating the path grouping
 513          * algorithm, so we start with sense id and box the device after an
 514          * timeout (or if sense pgid during path verification detects the device
 515          * is locked, as may happen on newer devices).
 516          */
 517         cdev->private->flags.recog_done = 0;
 518         cdev->private->state = DEV_STATE_SENSE_ID;
 519         ccw_device_sense_id_start(cdev);
 520         return 0;
 521 }
 522
 523 /*
 524  * Handle timeout in device recognition.
 525  */
 526 static void
 527 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 528 {
 529         int ret;
 530
 531         ret = ccw_device_cancel_halt_clear(cdev);
 532         switch (ret) {
 533         case 0:
 534                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 535                 break;
 536         case -ENODEV:
 537                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 538                 break;
 539         default:
 540                 ccw_device_set_timeout(cdev, 3*HZ);
 541         }
 542 }
 543
 544
 545 static void
 546 ccw_device_nopath_notify(struct work_struct *work)
 547 {
 548         struct ccw_device_private *priv;
 549         struct ccw_device *cdev;
 550         struct subchannel *sch;
 551         int ret;
 552         unsigned long flags;
 553
 554         priv = container_of(work, struct ccw_device_private, kick_work);
 555         cdev = priv->cdev;
 556         spin_lock_irqsave(cdev->ccwlock, flags);
 557         sch = to_subchannel(cdev->dev.parent);
 558         /* Extra sanity. */
 559         if (sch->lpm)
 560                 goto out_unlock;
 561         if (sch->driver && sch->driver->notify) {
 562                 spin_unlock_irqrestore(cdev->ccwlock, flags);
 563                 ret = sch->driver->notify(&sch->dev, CIO_NO_PATH);
 564                 spin_lock_irqsave(cdev->ccwlock, flags);
 565         } else
 566                 ret = 0;
 567         if (!ret) {
 568                 if (get_device(&sch->dev)) {
 569                         /* Driver doesn't want to keep device. */
 570                         cio_disable_subchannel(sch);
 571                         if (get_device(&cdev->dev)) {
 572                                 PREPARE_WORK(&cdev->private->kick_work,
 573                                              ccw_device_call_sch_unregister);
 574                                 queue_work(ccw_device_work,
 575                                            &cdev->private->kick_work);
 576                         } else
 577                                 put_device(&sch->dev);
 578                 }
 579         } else {
 580                 cio_disable_subchannel(sch);
 581                 ccw_device_set_timeout(cdev, 0);
 582                 cdev->private->flags.fake_irb = 0;
 583                 cdev->private->state = DEV_STATE_DISCONNECTED;
 584                 wake_up(&cdev->private->wait_q);
 585         }
 586 out_unlock:
 587         spin_unlock_irqrestore(cdev->ccwlock, flags);
 588 }
 589
 590 void
 591 ccw_device_verify_done(struct ccw_device *cdev, int err)
 592 {
 593         struct subchannel *sch;
 594
 595         sch = to_subchannel(cdev->dev.parent);
 596         /* Update schib - pom may have changed. */
 597         stsch(sch->schid, &sch->schib);
 598         /* Update lpm with verified path mask. */
 599         sch->lpm = sch->vpm;
 600         /* Repeat path verification? */
 601         if (cdev->private->flags.doverify) {
 602                 cdev->private->flags.doverify = 0;
 603                 ccw_device_verify_start(cdev);
 604                 return;
 605         }
 606         switch (err) {
 607         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 608                 cdev->private->options.pgroup = 0;
 609         case 0:
 610                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 611                 /* Deliver fake irb to device driver, if needed. */
 612                 if (cdev->private->flags.fake_irb) {
 613                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 614                         cdev->private->irb.scsw.cc = 1;
 615                         cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC;
 616                         cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND;
 617                         cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND;
 618                         cdev->private->flags.fake_irb = 0;
 619                         if (cdev->handler)
 620                                 cdev->handler(cdev, cdev->private->intparm,
 621                                               &cdev->private->irb);
 622                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 623                 }
 624                 break;
 625         case -ETIME:
 626                 /* Reset oper notify indication after verify error. */
 627                 cdev->private->flags.donotify = 0;
 628                 ccw_device_done(cdev, DEV_STATE_BOXED);
 629                 break;
 630         default:
 631                 /* Reset oper notify indication after verify error. */
 632                 cdev->private->flags.donotify = 0;
 633                 if (cdev->online) {
 634                         PREPARE_WORK(&cdev->private->kick_work,
 635                                      ccw_device_nopath_notify);
 636                         queue_work(ccw_device_notify_work,
 637                                    &cdev->private->kick_work);
 638                 } else
 639                         ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 640                 break;
 641         }
 642 }
 643
 644 /*
 645  * Get device online.
 646  */
 647 int
 648 ccw_device_online(struct ccw_device *cdev)
 649 {
 650         struct subchannel *sch;
 651         int ret;
 652
 653         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 654             (cdev->private->state != DEV_STATE_BOXED))
 655                 return -EINVAL;
 656         sch = to_subchannel(cdev->dev.parent);
 657         if (css_init_done && !get_device(&cdev->dev))
 658                 return -ENODEV;
 659         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 660         if (ret != 0) {
 661                 /* Couldn't enable the subchannel for i/o. Sick device. */
 662                 if (ret == -ENODEV)
 663                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 664                 return ret;
 665         }
 666         /* Do we want to do path grouping? */
 667         if (!cdev->private->options.pgroup) {
 668                 /* Start initial path verification. */
 669                 cdev->private->state = DEV_STATE_VERIFY;
 670                 cdev->private->flags.doverify = 0;
 671                 ccw_device_verify_start(cdev);
 672                 return 0;
 673         }
 674         /* Do a SensePGID first. */
 675         cdev->private->state = DEV_STATE_SENSE_PGID;
 676         ccw_device_sense_pgid_start(cdev);
 677         return 0;
 678 }
 679
 680 void
 681 ccw_device_disband_done(struct ccw_device *cdev, int err)
 682 {
 683         switch (err) {
 684         case 0:
 685                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 686                 break;
 687         case -ETIME:
 688                 ccw_device_done(cdev, DEV_STATE_BOXED);
 689                 break;
 690         default:
 691                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 692                 break;
 693         }
 694 }
 695
 696 /*
 697  * Shutdown device.
 698  */
 699 int
 700 ccw_device_offline(struct ccw_device *cdev)
 701 {
 702         struct subchannel *sch;
 703
 704         if (ccw_device_is_orphan(cdev)) {
 705                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 706                 return 0;
 707         }
 708         sch = to_subchannel(cdev->dev.parent);
 709         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
 710                 return -ENODEV;
 711         if (cdev->private->state != DEV_STATE_ONLINE) {
 712                 if (sch->schib.scsw.actl != 0)
 713                         return -EBUSY;
 714                 return -EINVAL;
 715         }
 716         if (sch->schib.scsw.actl != 0)
 717                 return -EBUSY;
 718         /* Are we doing path grouping? */
 719         if (!cdev->private->options.pgroup) {
 720                 /* No, set state offline immediately. */
 721                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 722                 return 0;
 723         }
 724         /* Start Set Path Group commands. */
 725         cdev->private->state = DEV_STATE_DISBAND_PGID;
 726         ccw_device_disband_start(cdev);
 727         return 0;
 728 }
 729
 730 /*
 731  * Handle timeout in device online/offline process.
 732  */
 733 static void
 734 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 735 {
 736         int ret;
 737
 738         ret = ccw_device_cancel_halt_clear(cdev);
 739         switch (ret) {
 740         case 0:
 741                 ccw_device_done(cdev, DEV_STATE_BOXED);
 742                 break;
 743         case -ENODEV:
 744                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 745                 break;
 746         default:
 747                 ccw_device_set_timeout(cdev, 3*HZ);
 748         }
 749 }
 750
 751 /*
 752  * Handle not oper event in device recognition.
 753  */
 754 static void
 755 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 756 {
 757         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 758 }
 759
 760 /*
 761  * Handle not operational event while offline.
 762  */
 763 static void
 764 ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 765 {
 766         struct subchannel *sch;
 767
 768         cdev->private->state = DEV_STATE_NOT_OPER;
 769         sch = to_subchannel(cdev->dev.parent);
 770         if (get_device(&cdev->dev)) {
 771                 PREPARE_WORK(&cdev->private->kick_work,
 772                              ccw_device_call_sch_unregister);
 773                 queue_work(ccw_device_work, &cdev->private->kick_work);
 774         }
 775         wake_up(&cdev->private->wait_q);
 776 }
 777
 778 /*
 779  * Handle not operational event while online.
 780  */
 781 static void
 782 ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 783 {
 784         struct subchannel *sch;
 785         int ret;
 786
 787         sch = to_subchannel(cdev->dev.parent);
 788         if (sch->driver->notify) {
 789                 spin_unlock_irq(cdev->ccwlock);
 790                 ret = sch->driver->notify(&sch->dev,
 791                                           sch->lpm ? CIO_GONE : CIO_NO_PATH);
 792                 spin_lock_irq(cdev->ccwlock);
 793         } else
 794                 ret = 0;
 795         if (ret) {
 796                 ccw_device_set_timeout(cdev, 0);
 797                 cdev->private->flags.fake_irb = 0;
 798                 cdev->private->state = DEV_STATE_DISCONNECTED;
 799                 wake_up(&cdev->private->wait_q);
 800                 return;
 801         }
 802         cdev->private->state = DEV_STATE_NOT_OPER;
 803         cio_disable_subchannel(sch);
 804         if (sch->schib.scsw.actl != 0) {
 805                 // FIXME: not-oper indication to device driver ?
 806                 ccw_device_call_handler(cdev);
 807         }
 808         if (get_device(&cdev->dev)) {
 809                 PREPARE_WORK(&cdev->private->kick_work,
 810                              ccw_device_call_sch_unregister);
 811                 queue_work(ccw_device_work, &cdev->private->kick_work);
 812         }
 813         wake_up(&cdev->private->wait_q);
 814 }
 815
 816 /*
 817  * Handle path verification event.
 818  */
 819 static void
 820 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 821 {
 822         struct subchannel *sch;
 823
 824         if (cdev->private->state == DEV_STATE_W4SENSE) {
 825                 cdev->private->flags.doverify = 1;
 826                 return;
 827         }
 828         sch = to_subchannel(cdev->dev.parent);
 829         /*
 830          * Since we might not just be coming from an interrupt from the
 831          * subchannel we have to update the schib.
 832          */
 833         stsch(sch->schid, &sch->schib);
 834
 835         if (sch->schib.scsw.actl != 0 ||
 836             (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) ||
 837             (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
 838                 /*
 839                  * No final status yet or final status not yet delivered
 840                  * to the device driver. Can't do path verfication now,
 841                  * delay until final status was delivered.
 842                  */
 843                 cdev->private->flags.doverify = 1;
 844                 return;
 845         }
 846         /* Device is idle, we can do the path verification. */
 847         cdev->private->state = DEV_STATE_VERIFY;
 848         cdev->private->flags.doverify = 0;
 849         ccw_device_verify_start(cdev);
 850 }
 851
 852 /*
 853  * Got an interrupt for a normal io (state online).
 854  */
 855 static void
 856 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 857 {
 858         struct irb *irb;
 859
 860         irb = (struct irb *) __LC_IRB;
 861         /* Check for unsolicited interrupt. */
 862         if ((irb->scsw.stctl ==
 863                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
 864             && (!irb->scsw.cc)) {
 865                 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 866                     !irb->esw.esw0.erw.cons) {
 867                         /* Unit check but no sense data. Need basic sense. */
 868                         if (ccw_device_do_sense(cdev, irb) != 0)
 869                                 goto call_handler_unsol;
 870                         memcpy(&cdev->private->irb, irb, sizeof(struct irb));
 871                         cdev->private->state = DEV_STATE_W4SENSE;
 872                         cdev->private->intparm = 0;
 873                         return;
 874                 }
 875 call_handler_unsol:
 876                 if (cdev->handler)
 877                         cdev->handler (cdev, 0, irb);
 878                 if (cdev->private->flags.doverify)
 879                         ccw_device_online_verify(cdev, 0);
 880                 return;
 881         }
 882         /* Accumulate status and find out if a basic sense is needed. */
 883         ccw_device_accumulate_irb(cdev, irb);
 884         if (cdev->private->flags.dosense) {
 885                 if (ccw_device_do_sense(cdev, irb) == 0) {
 886                         cdev->private->state = DEV_STATE_W4SENSE;
 887                 }
 888                 return;
 889         }
 890         /* Call the handler. */
 891         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 892                 /* Start delayed path verification. */
 893                 ccw_device_online_verify(cdev, 0);
 894 }
 895
 896 /*
 897  * Got an timeout in online state.
 898  */
 899 static void
 900 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 901 {
 902         int ret;
 903
 904         ccw_device_set_timeout(cdev, 0);
 905         ret = ccw_device_cancel_halt_clear(cdev);
 906         if (ret == -EBUSY) {
 907                 ccw_device_set_timeout(cdev, 3*HZ);
 908                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 909                 return;
 910         }
 911         if (ret == -ENODEV) {
 912                 struct subchannel *sch;
 913
 914                 sch = to_subchannel(cdev->dev.parent);
 915                 if (!sch->lpm) {
 916                         PREPARE_WORK(&cdev->private->kick_work,
 917                                      ccw_device_nopath_notify);
 918                         queue_work(ccw_device_notify_work,
 919                                    &cdev->private->kick_work);
 920                 } else
 921                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 922         } else if (cdev->handler)
 923                 cdev->handler(cdev, cdev->private->intparm,
 924                               ERR_PTR(-ETIMEDOUT));
 925 }
 926
 927 /*
 928  * Got an interrupt for a basic sense.
 929  */
 930 static void
 931 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 932 {
 933         struct irb *irb;
 934
 935         irb = (struct irb *) __LC_IRB;
 936         /* Check for unsolicited interrupt. */
 937         if (irb->scsw.stctl ==
 938                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 939                 if (irb->scsw.cc == 1)
 940                         /* Basic sense hasn't started. Try again. */
 941                         ccw_device_do_sense(cdev, irb);
 942                 else {
 943                         printk(KERN_INFO "Huh? %s(%s): unsolicited "
 944                                "interrupt...\n",
 945                                __FUNCTION__, cdev->dev.bus_id);
 946                         if (cdev->handler)
 947                                 cdev->handler (cdev, 0, irb);
 948                 }
 949                 return;
 950         }
 951         /*
 952          * Check if a halt or clear has been issued in the meanwhile. If yes,
 953          * only deliver the halt/clear interrupt to the device driver as if it
 954          * had killed the original request.
 955          */
 956         if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
 957                 /* Retry Basic Sense if requested. */
 958                 if (cdev->private->flags.intretry) {
 959                         cdev->private->flags.intretry = 0;
 960                         ccw_device_do_sense(cdev, irb);
 961                         return;
 962                 }
 963                 cdev->private->flags.dosense = 0;
 964                 memset(&cdev->private->irb, 0, sizeof(struct irb));
 965                 ccw_device_accumulate_irb(cdev, irb);
 966                 goto call_handler;
 967         }
 968         /* Add basic sense info to irb. */
 969         ccw_device_accumulate_basic_sense(cdev, irb);
 970         if (cdev->private->flags.dosense) {
 971                 /* Another basic sense is needed. */
 972                 ccw_device_do_sense(cdev, irb);
 973                 return;
 974         }
 975 call_handler:
 976         cdev->private->state = DEV_STATE_ONLINE;
 977         /* Call the handler. */
 978         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 979                 /* Start delayed path verification. */
 980                 ccw_device_online_verify(cdev, 0);
 981 }
 982
 983 static void
 984 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 985 {
 986         struct irb *irb;
 987
 988         irb = (struct irb *) __LC_IRB;
 989         /* Accumulate status. We don't do basic sense. */
 990         ccw_device_accumulate_irb(cdev, irb);
 991         /* Remember to clear irb to avoid residuals. */
 992         memset(&cdev->private->irb, 0, sizeof(struct irb));
 993         /* Try to start delayed device verification. */
 994         ccw_device_online_verify(cdev, 0);
 995         /* Note: Don't call handler for cio initiated clear! */
 996 }
 997
 998 static void
 999 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
1000 {
1001         struct subchannel *sch;
1002
1003         sch = to_subchannel(cdev->dev.parent);
1004         ccw_device_set_timeout(cdev, 0);
1005         /* Start delayed path verification. */
1006         ccw_device_online_verify(cdev, 0);
1007         /* OK, i/o is dead now. Call interrupt handler. */
1008         if (cdev->handler)
1009                 cdev->handler(cdev, cdev->private->intparm,
1010                               ERR_PTR(-EIO));
1011 }
1012
1013 static void
1014 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1015 {
1016         int ret;
1017
1018         ret = ccw_device_cancel_halt_clear(cdev);
1019         if (ret == -EBUSY) {
1020                 ccw_device_set_timeout(cdev, 3*HZ);
1021                 return;
1022         }
1023         /* Start delayed path verification. */
1024         ccw_device_online_verify(cdev, 0);
1025         if (cdev->handler)
1026                 cdev->handler(cdev, cdev->private->intparm,
1027                               ERR_PTR(-EIO));
1028 }
1029
1030 void device_kill_io(struct subchannel *sch)
1031 {
1032         int ret;
1033         struct ccw_device *cdev;
1034
1035         cdev = sch->dev.driver_data;
1036         ret = ccw_device_cancel_halt_clear(cdev);
1037         if (ret == -EBUSY) {
1038                 ccw_device_set_timeout(cdev, 3*HZ);
1039                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
1040                 return;
1041         }
1042         /* Start delayed path verification. */
1043         ccw_device_online_verify(cdev, 0);
1044         if (cdev->handler)
1045                 cdev->handler(cdev, cdev->private->intparm,
1046                               ERR_PTR(-EIO));
1047 }
1048
1049 static void
1050 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
1051 {
1052         /* Start verification after current task finished. */
1053         cdev->private->flags.doverify = 1;
1054 }
1055
1056 static void
1057 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1058 {
1059         struct irb *irb;
1060
1061         switch (dev_event) {
1062         case DEV_EVENT_INTERRUPT:
1063                 irb = (struct irb *) __LC_IRB;
1064                 /* Check for unsolicited interrupt. */
1065                 if ((irb->scsw.stctl ==
1066                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1067                     (!irb->scsw.cc))
1068                         /* FIXME: we should restart stlck here, but this
1069                          * is extremely unlikely ... */
1070                         goto out_wakeup;
1071
1072                 ccw_device_accumulate_irb(cdev, irb);
1073                 /* We don't care about basic sense etc. */
1074                 break;
1075         default: /* timeout */
1076                 break;
1077         }
1078 out_wakeup:
1079         wake_up(&cdev->private->wait_q);
1080 }
1081
1082 static void
1083 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1084 {
1085         struct subchannel *sch;
1086
1087         sch = to_subchannel(cdev->dev.parent);
1088         if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1089                 /* Couldn't enable the subchannel for i/o. Sick device. */
1090                 return;
1091
1092         /* After 60s the device recognition is considered to have failed. */
1093         ccw_device_set_timeout(cdev, 60*HZ);
1094
1095         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1096         ccw_device_sense_id_start(cdev);
1097 }
1098
1099 void
1100 device_trigger_reprobe(struct subchannel *sch)
1101 {
1102         struct ccw_device *cdev;
1103
1104         if (!sch->dev.driver_data)
1105                 return;
1106         cdev = sch->dev.driver_data;
1107         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1108                 return;
1109
1110         /* Update some values. */
1111         if (stsch(sch->schid, &sch->schib))
1112                 return;
1113         if (!sch->schib.pmcw.dnv)
1114                 return;
1115         /*
1116          * The pim, pam, pom values may not be accurate, but they are the best
1117          * we have before performing device selection :/
1118          */
1119         sch->lpm = sch->schib.pmcw.pam & sch->opm;
1120         /* Re-set some bits in the pmcw that were lost. */
1121         sch->schib.pmcw.isc = 3;
1122         sch->schib.pmcw.csense = 1;
1123         sch->schib.pmcw.ena = 0;
1124         if ((sch->lpm & (sch->lpm - 1)) != 0)
1125                 sch->schib.pmcw.mp = 1;
1126         sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1127         /* We should also udate ssd info, but this has to wait. */
1128         /* Check if this is another device which appeared on the same sch. */
1129         if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1130                 PREPARE_WORK(&cdev->private->kick_work,
1131                              ccw_device_move_to_orphanage);
1132                 queue_work(ccw_device_work, &cdev->private->kick_work);
1133         } else
1134                 ccw_device_start_id(cdev, 0);
1135 }
1136
1137 static void
1138 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1139 {
1140         struct subchannel *sch;
1141
1142         sch = to_subchannel(cdev->dev.parent);
1143         /*
1144          * An interrupt in state offline means a previous disable was not
1145          * successful. Try again.
1146          */
1147         cio_disable_subchannel(sch);
1148 }
1149
1150 static void
1151 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1152 {
1153         retry_set_schib(cdev);
1154         cdev->private->state = DEV_STATE_ONLINE;
1155         dev_fsm_event(cdev, dev_event);
1156 }
1157
1158 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1159                                        enum dev_event dev_event)
1160 {
1161         cmf_retry_copy_block(cdev);
1162         cdev->private->state = DEV_STATE_ONLINE;
1163         dev_fsm_event(cdev, dev_event);
1164 }
1165
1166 static void
1167 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1168 {
1169         ccw_device_set_timeout(cdev, 0);
1170         if (dev_event == DEV_EVENT_NOTOPER)
1171                 cdev->private->state = DEV_STATE_NOT_OPER;
1172         else
1173                 cdev->private->state = DEV_STATE_OFFLINE;
1174         wake_up(&cdev->private->wait_q);
1175 }
1176
1177 static void
1178 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1179 {
1180         int ret;
1181
1182         ret = ccw_device_cancel_halt_clear(cdev);
1183         switch (ret) {
1184         case 0:
1185                 cdev->private->state = DEV_STATE_OFFLINE;
1186                 wake_up(&cdev->private->wait_q);
1187                 break;
1188         case -ENODEV:
1189                 cdev->private->state = DEV_STATE_NOT_OPER;
1190                 wake_up(&cdev->private->wait_q);
1191                 break;
1192         default:
1193                 ccw_device_set_timeout(cdev, HZ/10);
1194         }
1195 }
1196
1197 /*
1198  * No operation action. This is used e.g. to ignore a timeout event in
1199  * state offline.
1200  */
1201 static void
1202 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1203 {
1204 }
1205
1206 /*
1207  * Bug operation action.
1208  */
1209 static void
1210 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1211 {
1212         printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
1213                cdev->private->state, dev_event);
1214         BUG();
1215 }
1216
1217 /*
1218  * device statemachine
1219  */
1220 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1221         [DEV_STATE_NOT_OPER] = {
1222                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1223                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1224                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1225                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1226         },
1227         [DEV_STATE_SENSE_PGID] = {
1228                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1229                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1230                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1231                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1232         },
1233         [DEV_STATE_SENSE_ID] = {
1234                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1235                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1236                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1237                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1238         },
1239         [DEV_STATE_OFFLINE] = {
1240                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1241                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1242                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1243                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1244         },
1245         [DEV_STATE_VERIFY] = {
1246                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1247                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1248                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1249                 [DEV_EVENT_VERIFY]      = ccw_device_delay_verify,
1250         },
1251         [DEV_STATE_ONLINE] = {
1252                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1253                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1254                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1255                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1256         },
1257         [DEV_STATE_W4SENSE] = {
1258                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1259                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1260                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1261                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1262         },
1263         [DEV_STATE_DISBAND_PGID] = {
1264                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1265                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1266                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1267                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1268         },
1269         [DEV_STATE_BOXED] = {
1270                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1271                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1272                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1273                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1274         },
1275         /* states to wait for i/o completion before doing something */
1276         [DEV_STATE_CLEAR_VERIFY] = {
1277                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1278                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1279                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1280                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1281         },
1282         [DEV_STATE_TIMEOUT_KILL] = {
1283                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1284                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1285                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1286                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1287         },
1288         [DEV_STATE_QUIESCE] = {
1289                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1290                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1291                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1292                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1293         },
1294         /* special states for devices gone not operational */
1295         [DEV_STATE_DISCONNECTED] = {
1296                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1297                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1298                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1299                 [DEV_EVENT_VERIFY]      = ccw_device_start_id,
1300         },
1301         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1302                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1303                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1304                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1305                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1306         },
1307         [DEV_STATE_CMFCHANGE] = {
1308                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1309                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1310                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1311                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1312         },
1313         [DEV_STATE_CMFUPDATE] = {
1314                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1315                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1316                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1317                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1318         },
1319 };
1320
1321 /*
1322  * io_subchannel_irq is called for "real" interrupts or for status
1323  * pending conditions on msch.
1324  */
1325 void
1326 io_subchannel_irq (struct device *pdev)
1327 {
1328         struct ccw_device *cdev;
1329
1330         cdev = to_subchannel(pdev)->dev.driver_data;
1331
1332         CIO_TRACE_EVENT (3, "IRQ");
1333         CIO_TRACE_EVENT (3, pdev->bus_id);
1334         if (cdev)
1335                 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1336 }
1337
1338 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);