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                           "cio: 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,
 297                           "cio: SenseID : device 0.%x.%04x reports: "
 298                           "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
 299                           "%04X/%02X\n",
 300                           cdev->private->dev_id.ssid,
 301                           cdev->private->dev_id.devno,
 302                           cdev->id.cu_type, cdev->id.cu_model,
 303                           cdev->id.dev_type, cdev->id.dev_model);
 304                 break;
 305         case DEV_STATE_BOXED:
 306                 CIO_DEBUG(KERN_WARNING, 2,
 307                           "cio: SenseID : boxed device %04x on subchannel "
 308                           "0.%x.%04x\n", cdev->private->dev_id.devno,
 309                           sch->schid.ssid, sch->schid.sch_no);
 310                 break;
 311         }
 312         cdev->private->state = state;
 313         io_subchannel_recog_done(cdev);
 314         if (state != DEV_STATE_NOT_OPER)
 315                 wake_up(&cdev->private->wait_q);
 316 }
 317
 318 /*
 319  * Function called from device_id.c after sense id has completed.
 320  */
 321 void
 322 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
 323 {
 324         switch (err) {
 325         case 0:
 326                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
 327                 break;
 328         case -ETIME:            /* Sense id stopped by timeout. */
 329                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 330                 break;
 331         default:
 332                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 333                 break;
 334         }
 335 }
 336
 337 static void
 338 ccw_device_oper_notify(struct work_struct *work)
 339 {
 340         struct ccw_device_private *priv;
 341         struct ccw_device *cdev;
 342         struct subchannel *sch;
 343         int ret;
 344         unsigned long flags;
 345
 346         priv = container_of(work, struct ccw_device_private, kick_work);
 347         cdev = priv->cdev;
 348         spin_lock_irqsave(cdev->ccwlock, flags);
 349         sch = to_subchannel(cdev->dev.parent);
 350         if (sch->driver && sch->driver->notify) {
 351                 spin_unlock_irqrestore(cdev->ccwlock, flags);
 352                 ret = sch->driver->notify(&sch->dev, CIO_OPER);
 353                 spin_lock_irqsave(cdev->ccwlock, flags);
 354         } else
 355                 ret = 0;
 356         if (ret) {
 357                 /* Reenable channel measurements, if needed. */
 358                 spin_unlock_irqrestore(cdev->ccwlock, flags);
 359                 cmf_reenable(cdev);
 360                 spin_lock_irqsave(cdev->ccwlock, flags);
 361                 wake_up(&cdev->private->wait_q);
 362         }
 363         spin_unlock_irqrestore(cdev->ccwlock, flags);
 364         if (!ret)
 365                 /* Driver doesn't want device back. */
 366                 ccw_device_do_unreg_rereg(work);
 367 }
 368
 369 /*
 370  * Finished with online/offline processing.
 371  */
 372 static void
 373 ccw_device_done(struct ccw_device *cdev, int state)
 374 {
 375         struct subchannel *sch;
 376
 377         sch = to_subchannel(cdev->dev.parent);
 378
 379         ccw_device_set_timeout(cdev, 0);
 380
 381         if (state != DEV_STATE_ONLINE)
 382                 cio_disable_subchannel(sch);
 383
 384         /* Reset device status. */
 385         memset(&cdev->private->irb, 0, sizeof(struct irb));
 386
 387         cdev->private->state = state;
 388
 389
 390         if (state == DEV_STATE_BOXED)
 391                 CIO_DEBUG(KERN_WARNING, 2,
 392                           "cio: Boxed device %04x on subchannel %04x\n",
 393                           cdev->private->dev_id.devno, sch->schid.sch_no);
 394
 395         if (cdev->private->flags.donotify) {
 396                 cdev->private->flags.donotify = 0;
 397                 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify);
 398                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 399         }
 400         wake_up(&cdev->private->wait_q);
 401
 402         if (css_init_done && state != DEV_STATE_ONLINE)
 403                 put_device (&cdev->dev);
 404 }
 405
 406 static int cmp_pgid(struct pgid *p1, struct pgid *p2)
 407 {
 408         char *c1;
 409         char *c2;
 410
 411         c1 = (char *)p1;
 412         c2 = (char *)p2;
 413
 414         return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
 415 }
 416
 417 static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
 418 {
 419         int i;
 420         int last;
 421
 422         last = 0;
 423         for (i = 0; i < 8; i++) {
 424                 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
 425                         /* No PGID yet */
 426                         continue;
 427                 if (cdev->private->pgid[last].inf.ps.state1 ==
 428                     SNID_STATE1_RESET) {
 429                         /* First non-zero PGID */
 430                         last = i;
 431                         continue;
 432                 }
 433                 if (cmp_pgid(&cdev->private->pgid[i],
 434                              &cdev->private->pgid[last]) == 0)
 435                         /* Non-conflicting PGIDs */
 436                         continue;
 437
 438                 /* PGID mismatch, can't pathgroup. */
 439                 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
 440                               "0.%x.%04x, can't pathgroup\n",
 441                               cdev->private->dev_id.ssid,
 442                               cdev->private->dev_id.devno);
 443                 cdev->private->options.pgroup = 0;
 444                 return;
 445         }
 446         if (cdev->private->pgid[last].inf.ps.state1 ==
 447             SNID_STATE1_RESET)
 448                 /* No previous pgid found */
 449                 memcpy(&cdev->private->pgid[0],
 450                        &channel_subsystems[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                 cdev->private->flags.donotify = 0;
 694                 if (get_device(&cdev->dev)) {
 695                         PREPARE_WORK(&cdev->private->kick_work,
 696                                      ccw_device_call_sch_unregister);
 697                         queue_work(ccw_device_work, &cdev->private->kick_work);
 698                 }
 699                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 700                 break;
 701         }
 702 }
 703
 704 /*
 705  * Shutdown device.
 706  */
 707 int
 708 ccw_device_offline(struct ccw_device *cdev)
 709 {
 710         struct subchannel *sch;
 711
 712         if (ccw_device_is_orphan(cdev)) {
 713                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 714                 return 0;
 715         }
 716         sch = to_subchannel(cdev->dev.parent);
 717         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
 718                 return -ENODEV;
 719         if (cdev->private->state != DEV_STATE_ONLINE) {
 720                 if (sch->schib.scsw.actl != 0)
 721                         return -EBUSY;
 722                 return -EINVAL;
 723         }
 724         if (sch->schib.scsw.actl != 0)
 725                 return -EBUSY;
 726         /* Are we doing path grouping? */
 727         if (!cdev->private->options.pgroup) {
 728                 /* No, set state offline immediately. */
 729                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 730                 return 0;
 731         }
 732         /* Start Set Path Group commands. */
 733         cdev->private->state = DEV_STATE_DISBAND_PGID;
 734         ccw_device_disband_start(cdev);
 735         return 0;
 736 }
 737
 738 /*
 739  * Handle timeout in device online/offline process.
 740  */
 741 static void
 742 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 743 {
 744         int ret;
 745
 746         ret = ccw_device_cancel_halt_clear(cdev);
 747         switch (ret) {
 748         case 0:
 749                 ccw_device_done(cdev, DEV_STATE_BOXED);
 750                 break;
 751         case -ENODEV:
 752                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 753                 break;
 754         default:
 755                 ccw_device_set_timeout(cdev, 3*HZ);
 756         }
 757 }
 758
 759 /*
 760  * Handle not oper event in device recognition.
 761  */
 762 static void
 763 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 764 {
 765         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 766 }
 767
 768 /*
 769  * Handle not operational event while offline.
 770  */
 771 static void
 772 ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 773 {
 774         struct subchannel *sch;
 775
 776         cdev->private->state = DEV_STATE_NOT_OPER;
 777         sch = to_subchannel(cdev->dev.parent);
 778         if (get_device(&cdev->dev)) {
 779                 PREPARE_WORK(&cdev->private->kick_work,
 780                              ccw_device_call_sch_unregister);
 781                 queue_work(ccw_device_work, &cdev->private->kick_work);
 782         }
 783         wake_up(&cdev->private->wait_q);
 784 }
 785
 786 /*
 787  * Handle not operational event while online.
 788  */
 789 static void
 790 ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 791 {
 792         struct subchannel *sch;
 793         int ret;
 794
 795         sch = to_subchannel(cdev->dev.parent);
 796         if (sch->driver->notify) {
 797                 spin_unlock_irq(cdev->ccwlock);
 798                 ret = sch->driver->notify(&sch->dev,
 799                                           sch->lpm ? CIO_GONE : CIO_NO_PATH);
 800                 spin_lock_irq(cdev->ccwlock);
 801         } else
 802                 ret = 0;
 803         if (ret) {
 804                 ccw_device_set_timeout(cdev, 0);
 805                 cdev->private->flags.fake_irb = 0;
 806                 cdev->private->state = DEV_STATE_DISCONNECTED;
 807                 wake_up(&cdev->private->wait_q);
 808                 return;
 809         }
 810         cdev->private->state = DEV_STATE_NOT_OPER;
 811         cio_disable_subchannel(sch);
 812         if (sch->schib.scsw.actl != 0) {
 813                 // FIXME: not-oper indication to device driver ?
 814                 ccw_device_call_handler(cdev);
 815         }
 816         if (get_device(&cdev->dev)) {
 817                 PREPARE_WORK(&cdev->private->kick_work,
 818                              ccw_device_call_sch_unregister);
 819                 queue_work(ccw_device_work, &cdev->private->kick_work);
 820         }
 821         wake_up(&cdev->private->wait_q);
 822 }
 823
 824 /*
 825  * Handle path verification event.
 826  */
 827 static void
 828 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 829 {
 830         struct subchannel *sch;
 831
 832         if (cdev->private->state == DEV_STATE_W4SENSE) {
 833                 cdev->private->flags.doverify = 1;
 834                 return;
 835         }
 836         sch = to_subchannel(cdev->dev.parent);
 837         /*
 838          * Since we might not just be coming from an interrupt from the
 839          * subchannel we have to update the schib.
 840          */
 841         stsch(sch->schid, &sch->schib);
 842
 843         if (sch->schib.scsw.actl != 0 ||
 844             (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) ||
 845             (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
 846                 /*
 847                  * No final status yet or final status not yet delivered
 848                  * to the device driver. Can't do path verfication now,
 849                  * delay until final status was delivered.
 850                  */
 851                 cdev->private->flags.doverify = 1;
 852                 return;
 853         }
 854         /* Device is idle, we can do the path verification. */
 855         cdev->private->state = DEV_STATE_VERIFY;
 856         cdev->private->flags.doverify = 0;
 857         ccw_device_verify_start(cdev);
 858 }
 859
 860 /*
 861  * Got an interrupt for a normal io (state online).
 862  */
 863 static void
 864 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 865 {
 866         struct irb *irb;
 867
 868         irb = (struct irb *) __LC_IRB;
 869         /* Check for unsolicited interrupt. */
 870         if ((irb->scsw.stctl ==
 871                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
 872             && (!irb->scsw.cc)) {
 873                 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 874                     !irb->esw.esw0.erw.cons) {
 875                         /* Unit check but no sense data. Need basic sense. */
 876                         if (ccw_device_do_sense(cdev, irb) != 0)
 877                                 goto call_handler_unsol;
 878                         memcpy(&cdev->private->irb, irb, sizeof(struct irb));
 879                         cdev->private->state = DEV_STATE_W4SENSE;
 880                         cdev->private->intparm = 0;
 881                         return;
 882                 }
 883 call_handler_unsol:
 884                 if (cdev->handler)
 885                         cdev->handler (cdev, 0, irb);
 886                 if (cdev->private->flags.doverify)
 887                         ccw_device_online_verify(cdev, 0);
 888                 return;
 889         }
 890         /* Accumulate status and find out if a basic sense is needed. */
 891         ccw_device_accumulate_irb(cdev, irb);
 892         if (cdev->private->flags.dosense) {
 893                 if (ccw_device_do_sense(cdev, irb) == 0) {
 894                         cdev->private->state = DEV_STATE_W4SENSE;
 895                 }
 896                 return;
 897         }
 898         /* Call the handler. */
 899         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 900                 /* Start delayed path verification. */
 901                 ccw_device_online_verify(cdev, 0);
 902 }
 903
 904 /*
 905  * Got an timeout in online state.
 906  */
 907 static void
 908 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 909 {
 910         int ret;
 911
 912         ccw_device_set_timeout(cdev, 0);
 913         ret = ccw_device_cancel_halt_clear(cdev);
 914         if (ret == -EBUSY) {
 915                 ccw_device_set_timeout(cdev, 3*HZ);
 916                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 917                 return;
 918         }
 919         if (ret == -ENODEV) {
 920                 struct subchannel *sch;
 921
 922                 sch = to_subchannel(cdev->dev.parent);
 923                 if (!sch->lpm) {
 924                         PREPARE_WORK(&cdev->private->kick_work,
 925                                      ccw_device_nopath_notify);
 926                         queue_work(ccw_device_notify_work,
 927                                    &cdev->private->kick_work);
 928                 } else
 929                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 930         } else if (cdev->handler)
 931                 cdev->handler(cdev, cdev->private->intparm,
 932                               ERR_PTR(-ETIMEDOUT));
 933 }
 934
 935 /*
 936  * Got an interrupt for a basic sense.
 937  */
 938 static void
 939 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 940 {
 941         struct irb *irb;
 942
 943         irb = (struct irb *) __LC_IRB;
 944         /* Check for unsolicited interrupt. */
 945         if (irb->scsw.stctl ==
 946                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 947                 if (irb->scsw.cc == 1)
 948                         /* Basic sense hasn't started. Try again. */
 949                         ccw_device_do_sense(cdev, irb);
 950                 else {
 951                         CIO_MSG_EVENT(2, "Huh? 0.%x.%04x: unsolicited "
 952                                       "interrupt during w4sense...\n",
 953                                       cdev->private->dev_id.ssid,
 954                                       cdev->private->dev_id.devno);
 955                         if (cdev->handler)
 956                                 cdev->handler (cdev, 0, irb);
 957                 }
 958                 return;
 959         }
 960         /*
 961          * Check if a halt or clear has been issued in the meanwhile. If yes,
 962          * only deliver the halt/clear interrupt to the device driver as if it
 963          * had killed the original request.
 964          */
 965         if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
 966                 /* Retry Basic Sense if requested. */
 967                 if (cdev->private->flags.intretry) {
 968                         cdev->private->flags.intretry = 0;
 969                         ccw_device_do_sense(cdev, irb);
 970                         return;
 971                 }
 972                 cdev->private->flags.dosense = 0;
 973                 memset(&cdev->private->irb, 0, sizeof(struct irb));
 974                 ccw_device_accumulate_irb(cdev, irb);
 975                 goto call_handler;
 976         }
 977         /* Add basic sense info to irb. */
 978         ccw_device_accumulate_basic_sense(cdev, irb);
 979         if (cdev->private->flags.dosense) {
 980                 /* Another basic sense is needed. */
 981                 ccw_device_do_sense(cdev, irb);
 982                 return;
 983         }
 984 call_handler:
 985         cdev->private->state = DEV_STATE_ONLINE;
 986         /* Call the handler. */
 987         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 988                 /* Start delayed path verification. */
 989                 ccw_device_online_verify(cdev, 0);
 990 }
 991
 992 static void
 993 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 994 {
 995         struct irb *irb;
 996
 997         irb = (struct irb *) __LC_IRB;
 998         /* Accumulate status. We don't do basic sense. */
 999         ccw_device_accumulate_irb(cdev, irb);
1000         /* Remember to clear irb to avoid residuals. */
1001         memset(&cdev->private->irb, 0, sizeof(struct irb));
1002         /* Try to start delayed device verification. */
1003         ccw_device_online_verify(cdev, 0);
1004         /* Note: Don't call handler for cio initiated clear! */
1005 }
1006
1007 static void
1008 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
1009 {
1010         struct subchannel *sch;
1011
1012         sch = to_subchannel(cdev->dev.parent);
1013         ccw_device_set_timeout(cdev, 0);
1014         /* Start delayed path verification. */
1015         ccw_device_online_verify(cdev, 0);
1016         /* OK, i/o is dead now. Call interrupt handler. */
1017         if (cdev->handler)
1018                 cdev->handler(cdev, cdev->private->intparm,
1019                               ERR_PTR(-EIO));
1020 }
1021
1022 static void
1023 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1024 {
1025         int ret;
1026
1027         ret = ccw_device_cancel_halt_clear(cdev);
1028         if (ret == -EBUSY) {
1029                 ccw_device_set_timeout(cdev, 3*HZ);
1030                 return;
1031         }
1032         /* Start delayed path verification. */
1033         ccw_device_online_verify(cdev, 0);
1034         if (cdev->handler)
1035                 cdev->handler(cdev, cdev->private->intparm,
1036                               ERR_PTR(-EIO));
1037 }
1038
1039 void device_kill_io(struct subchannel *sch)
1040 {
1041         int ret;
1042         struct ccw_device *cdev;
1043
1044         cdev = sch->dev.driver_data;
1045         ret = ccw_device_cancel_halt_clear(cdev);
1046         if (ret == -EBUSY) {
1047                 ccw_device_set_timeout(cdev, 3*HZ);
1048                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
1049                 return;
1050         }
1051         /* Start delayed path verification. */
1052         ccw_device_online_verify(cdev, 0);
1053         if (cdev->handler)
1054                 cdev->handler(cdev, cdev->private->intparm,
1055                               ERR_PTR(-EIO));
1056 }
1057
1058 static void
1059 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
1060 {
1061         /* Start verification after current task finished. */
1062         cdev->private->flags.doverify = 1;
1063 }
1064
1065 static void
1066 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1067 {
1068         struct irb *irb;
1069
1070         switch (dev_event) {
1071         case DEV_EVENT_INTERRUPT:
1072                 irb = (struct irb *) __LC_IRB;
1073                 /* Check for unsolicited interrupt. */
1074                 if ((irb->scsw.stctl ==
1075                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1076                     (!irb->scsw.cc))
1077                         /* FIXME: we should restart stlck here, but this
1078                          * is extremely unlikely ... */
1079                         goto out_wakeup;
1080
1081                 ccw_device_accumulate_irb(cdev, irb);
1082                 /* We don't care about basic sense etc. */
1083                 break;
1084         default: /* timeout */
1085                 break;
1086         }
1087 out_wakeup:
1088         wake_up(&cdev->private->wait_q);
1089 }
1090
1091 static void
1092 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1093 {
1094         struct subchannel *sch;
1095
1096         sch = to_subchannel(cdev->dev.parent);
1097         if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1098                 /* Couldn't enable the subchannel for i/o. Sick device. */
1099                 return;
1100
1101         /* After 60s the device recognition is considered to have failed. */
1102         ccw_device_set_timeout(cdev, 60*HZ);
1103
1104         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1105         ccw_device_sense_id_start(cdev);
1106 }
1107
1108 void
1109 device_trigger_reprobe(struct subchannel *sch)
1110 {
1111         struct ccw_device *cdev;
1112
1113         if (!sch->dev.driver_data)
1114                 return;
1115         cdev = sch->dev.driver_data;
1116         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1117                 return;
1118
1119         /* Update some values. */
1120         if (stsch(sch->schid, &sch->schib))
1121                 return;
1122         if (!sch->schib.pmcw.dnv)
1123                 return;
1124         /*
1125          * The pim, pam, pom values may not be accurate, but they are the best
1126          * we have before performing device selection :/
1127          */
1128         sch->lpm = sch->schib.pmcw.pam & sch->opm;
1129         /* Re-set some bits in the pmcw that were lost. */
1130         sch->schib.pmcw.isc = 3;
1131         sch->schib.pmcw.csense = 1;
1132         sch->schib.pmcw.ena = 0;
1133         if ((sch->lpm & (sch->lpm - 1)) != 0)
1134                 sch->schib.pmcw.mp = 1;
1135         sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1136         /* We should also udate ssd info, but this has to wait. */
1137         /* Check if this is another device which appeared on the same sch. */
1138         if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1139                 PREPARE_WORK(&cdev->private->kick_work,
1140                              ccw_device_move_to_orphanage);
1141                 queue_work(ccw_device_work, &cdev->private->kick_work);
1142         } else
1143                 ccw_device_start_id(cdev, 0);
1144 }
1145
1146 static void
1147 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1148 {
1149         struct subchannel *sch;
1150
1151         sch = to_subchannel(cdev->dev.parent);
1152         /*
1153          * An interrupt in state offline means a previous disable was not
1154          * successful. Try again.
1155          */
1156         cio_disable_subchannel(sch);
1157 }
1158
1159 static void
1160 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1161 {
1162         retry_set_schib(cdev);
1163         cdev->private->state = DEV_STATE_ONLINE;
1164         dev_fsm_event(cdev, dev_event);
1165 }
1166
1167 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1168                                        enum dev_event dev_event)
1169 {
1170         cmf_retry_copy_block(cdev);
1171         cdev->private->state = DEV_STATE_ONLINE;
1172         dev_fsm_event(cdev, dev_event);
1173 }
1174
1175 static void
1176 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1177 {
1178         ccw_device_set_timeout(cdev, 0);
1179         if (dev_event == DEV_EVENT_NOTOPER)
1180                 cdev->private->state = DEV_STATE_NOT_OPER;
1181         else
1182                 cdev->private->state = DEV_STATE_OFFLINE;
1183         wake_up(&cdev->private->wait_q);
1184 }
1185
1186 static void
1187 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1188 {
1189         int ret;
1190
1191         ret = ccw_device_cancel_halt_clear(cdev);
1192         switch (ret) {
1193         case 0:
1194                 cdev->private->state = DEV_STATE_OFFLINE;
1195                 wake_up(&cdev->private->wait_q);
1196                 break;
1197         case -ENODEV:
1198                 cdev->private->state = DEV_STATE_NOT_OPER;
1199                 wake_up(&cdev->private->wait_q);
1200                 break;
1201         default:
1202                 ccw_device_set_timeout(cdev, HZ/10);
1203         }
1204 }
1205
1206 /*
1207  * No operation action. This is used e.g. to ignore a timeout event in
1208  * state offline.
1209  */
1210 static void
1211 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1212 {
1213 }
1214
1215 /*
1216  * Bug operation action.
1217  */
1218 static void
1219 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1220 {
1221         CIO_MSG_EVENT(0, "dev_jumptable[%i][%i] == NULL\n",
1222                       cdev->private->state, dev_event);
1223         BUG();
1224 }
1225
1226 /*
1227  * device statemachine
1228  */
1229 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1230         [DEV_STATE_NOT_OPER] = {
1231                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1232                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1233                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1234                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1235         },
1236         [DEV_STATE_SENSE_PGID] = {
1237                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1238                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1239                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1240                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1241         },
1242         [DEV_STATE_SENSE_ID] = {
1243                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1244                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1245                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1246                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1247         },
1248         [DEV_STATE_OFFLINE] = {
1249                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1250                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1251                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1252                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1253         },
1254         [DEV_STATE_VERIFY] = {
1255                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1256                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1257                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1258                 [DEV_EVENT_VERIFY]      = ccw_device_delay_verify,
1259         },
1260         [DEV_STATE_ONLINE] = {
1261                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1262                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1263                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1264                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1265         },
1266         [DEV_STATE_W4SENSE] = {
1267                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1268                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1269                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1270                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1271         },
1272         [DEV_STATE_DISBAND_PGID] = {
1273                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1274                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1275                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1276                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1277         },
1278         [DEV_STATE_BOXED] = {
1279                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1280                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1281                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1282                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1283         },
1284         /* states to wait for i/o completion before doing something */
1285         [DEV_STATE_CLEAR_VERIFY] = {
1286                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1287                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1288                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1289                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1290         },
1291         [DEV_STATE_TIMEOUT_KILL] = {
1292                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1293                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1294                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1295                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1296         },
1297         [DEV_STATE_QUIESCE] = {
1298                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1299                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1300                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1301                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1302         },
1303         /* special states for devices gone not operational */
1304         [DEV_STATE_DISCONNECTED] = {
1305                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1306                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1307                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1308                 [DEV_EVENT_VERIFY]      = ccw_device_start_id,
1309         },
1310         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1311                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1312                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1313                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1314                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1315         },
1316         [DEV_STATE_CMFCHANGE] = {
1317                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1318                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1319                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1320                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1321         },
1322         [DEV_STATE_CMFUPDATE] = {
1323                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1324                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1325                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1326                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1327         },
1328 };
1329
1330 /*
1331  * io_subchannel_irq is called for "real" interrupts or for status
1332  * pending conditions on msch.
1333  */
1334 void
1335 io_subchannel_irq (struct device *pdev)
1336 {
1337         struct ccw_device *cdev;
1338
1339         cdev = to_subchannel(pdev)->dev.driver_data;
1340
1341         CIO_TRACE_EVENT (3, "IRQ");
1342         CIO_TRACE_EVENT (3, pdev->bus_id);
1343         if (cdev)
1344                 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1345 }
1346
1347 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);