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

   1 /*
   2  * drivers/s390/cio/device_fsm.c
   3  * finite state machine for device handling
   4  *
   5  *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
   6  *                       IBM Corporation
   7  *    Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
   8  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/jiffies.h>
  14 #include <linux/string.h>
  15
  16 #include <asm/ccwdev.h>
  17 #include <asm/cio.h>
  18 #include <asm/chpid.h>
  19
  20 #include "cio.h"
  21 #include "cio_debug.h"
  22 #include "css.h"
  23 #include "device.h"
  24 #include "chsc.h"
  25 #include "ioasm.h"
  26 #include "chp.h"
  27
  28 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 void
 548 ccw_device_verify_done(struct ccw_device *cdev, int err)
 549 {
 550         struct subchannel *sch;
 551
 552         sch = to_subchannel(cdev->dev.parent);
 553         /* Update schib - pom may have changed. */
 554         stsch(sch->schid, &sch->schib);
 555         /* Update lpm with verified path mask. */
 556         sch->lpm = sch->vpm;
 557         /* Repeat path verification? */
 558         if (cdev->private->flags.doverify) {
 559                 cdev->private->flags.doverify = 0;
 560                 ccw_device_verify_start(cdev);
 561                 return;
 562         }
 563         switch (err) {
 564         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 565                 cdev->private->options.pgroup = 0;
 566         case 0:
 567                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 568                 /* Deliver fake irb to device driver, if needed. */
 569                 if (cdev->private->flags.fake_irb) {
 570                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 571                         cdev->private->irb.scsw.cc = 1;
 572                         cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC;
 573                         cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND;
 574                         cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND;
 575                         cdev->private->flags.fake_irb = 0;
 576                         if (cdev->handler)
 577                                 cdev->handler(cdev, cdev->private->intparm,
 578                                               &cdev->private->irb);
 579                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 580                 }
 581                 break;
 582         case -ETIME:
 583                 /* Reset oper notify indication after verify error. */
 584                 cdev->private->flags.donotify = 0;
 585                 ccw_device_done(cdev, DEV_STATE_BOXED);
 586                 break;
 587         default:
 588                 /* Reset oper notify indication after verify error. */
 589                 cdev->private->flags.donotify = 0;
 590                 if (cdev->online)
 591                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 592                 else
 593                         ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 594                 break;
 595         }
 596 }
 597
 598 /*
 599  * Get device online.
 600  */
 601 int
 602 ccw_device_online(struct ccw_device *cdev)
 603 {
 604         struct subchannel *sch;
 605         int ret;
 606
 607         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 608             (cdev->private->state != DEV_STATE_BOXED))
 609                 return -EINVAL;
 610         sch = to_subchannel(cdev->dev.parent);
 611         if (css_init_done && !get_device(&cdev->dev))
 612                 return -ENODEV;
 613         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 614         if (ret != 0) {
 615                 /* Couldn't enable the subchannel for i/o. Sick device. */
 616                 if (ret == -ENODEV)
 617                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 618                 return ret;
 619         }
 620         /* Do we want to do path grouping? */
 621         if (!cdev->private->options.pgroup) {
 622                 /* Start initial path verification. */
 623                 cdev->private->state = DEV_STATE_VERIFY;
 624                 cdev->private->flags.doverify = 0;
 625                 ccw_device_verify_start(cdev);
 626                 return 0;
 627         }
 628         /* Do a SensePGID first. */
 629         cdev->private->state = DEV_STATE_SENSE_PGID;
 630         ccw_device_sense_pgid_start(cdev);
 631         return 0;
 632 }
 633
 634 void
 635 ccw_device_disband_done(struct ccw_device *cdev, int err)
 636 {
 637         switch (err) {
 638         case 0:
 639                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 640                 break;
 641         case -ETIME:
 642                 ccw_device_done(cdev, DEV_STATE_BOXED);
 643                 break;
 644         default:
 645                 cdev->private->flags.donotify = 0;
 646                 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 647                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 648                 break;
 649         }
 650 }
 651
 652 /*
 653  * Shutdown device.
 654  */
 655 int
 656 ccw_device_offline(struct ccw_device *cdev)
 657 {
 658         struct subchannel *sch;
 659
 660         if (ccw_device_is_orphan(cdev)) {
 661                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 662                 return 0;
 663         }
 664         sch = to_subchannel(cdev->dev.parent);
 665         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
 666                 return -ENODEV;
 667         if (cdev->private->state != DEV_STATE_ONLINE) {
 668                 if (sch->schib.scsw.actl != 0)
 669                         return -EBUSY;
 670                 return -EINVAL;
 671         }
 672         if (sch->schib.scsw.actl != 0)
 673                 return -EBUSY;
 674         /* Are we doing path grouping? */
 675         if (!cdev->private->options.pgroup) {
 676                 /* No, set state offline immediately. */
 677                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 678                 return 0;
 679         }
 680         /* Start Set Path Group commands. */
 681         cdev->private->state = DEV_STATE_DISBAND_PGID;
 682         ccw_device_disband_start(cdev);
 683         return 0;
 684 }
 685
 686 /*
 687  * Handle timeout in device online/offline process.
 688  */
 689 static void
 690 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 691 {
 692         int ret;
 693
 694         ret = ccw_device_cancel_halt_clear(cdev);
 695         switch (ret) {
 696         case 0:
 697                 ccw_device_done(cdev, DEV_STATE_BOXED);
 698                 break;
 699         case -ENODEV:
 700                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 701                 break;
 702         default:
 703                 ccw_device_set_timeout(cdev, 3*HZ);
 704         }
 705 }
 706
 707 /*
 708  * Handle not oper event in device recognition.
 709  */
 710 static void
 711 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 712 {
 713         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 714 }
 715
 716 /*
 717  * Handle not operational event in non-special state.
 718  */
 719 static void ccw_device_generic_notoper(struct ccw_device *cdev,
 720                                        enum dev_event dev_event)
 721 {
 722         struct subchannel *sch;
 723
 724         cdev->private->state = DEV_STATE_NOT_OPER;
 725         sch = to_subchannel(cdev->dev.parent);
 726         css_schedule_eval(sch->schid);
 727 }
 728
 729 /*
 730  * Handle path verification event.
 731  */
 732 static void
 733 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 734 {
 735         struct subchannel *sch;
 736
 737         if (cdev->private->state == DEV_STATE_W4SENSE) {
 738                 cdev->private->flags.doverify = 1;
 739                 return;
 740         }
 741         sch = to_subchannel(cdev->dev.parent);
 742         /*
 743          * Since we might not just be coming from an interrupt from the
 744          * subchannel we have to update the schib.
 745          */
 746         stsch(sch->schid, &sch->schib);
 747
 748         if (sch->schib.scsw.actl != 0 ||
 749             (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) ||
 750             (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
 751                 /*
 752                  * No final status yet or final status not yet delivered
 753                  * to the device driver. Can't do path verfication now,
 754                  * delay until final status was delivered.
 755                  */
 756                 cdev->private->flags.doverify = 1;
 757                 return;
 758         }
 759         /* Device is idle, we can do the path verification. */
 760         cdev->private->state = DEV_STATE_VERIFY;
 761         cdev->private->flags.doverify = 0;
 762         ccw_device_verify_start(cdev);
 763 }
 764
 765 /*
 766  * Got an interrupt for a normal io (state online).
 767  */
 768 static void
 769 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 770 {
 771         struct irb *irb;
 772
 773         irb = (struct irb *) __LC_IRB;
 774         /* Check for unsolicited interrupt. */
 775         if ((irb->scsw.stctl ==
 776                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
 777             && (!irb->scsw.cc)) {
 778                 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 779                     !irb->esw.esw0.erw.cons) {
 780                         /* Unit check but no sense data. Need basic sense. */
 781                         if (ccw_device_do_sense(cdev, irb) != 0)
 782                                 goto call_handler_unsol;
 783                         memcpy(&cdev->private->irb, irb, sizeof(struct irb));
 784                         cdev->private->state = DEV_STATE_W4SENSE;
 785                         cdev->private->intparm = 0;
 786                         return;
 787                 }
 788 call_handler_unsol:
 789                 if (cdev->handler)
 790                         cdev->handler (cdev, 0, irb);
 791                 if (cdev->private->flags.doverify)
 792                         ccw_device_online_verify(cdev, 0);
 793                 return;
 794         }
 795         /* Accumulate status and find out if a basic sense is needed. */
 796         ccw_device_accumulate_irb(cdev, irb);
 797         if (cdev->private->flags.dosense) {
 798                 if (ccw_device_do_sense(cdev, irb) == 0) {
 799                         cdev->private->state = DEV_STATE_W4SENSE;
 800                 }
 801                 return;
 802         }
 803         /* Call the handler. */
 804         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 805                 /* Start delayed path verification. */
 806                 ccw_device_online_verify(cdev, 0);
 807 }
 808
 809 /*
 810  * Got an timeout in online state.
 811  */
 812 static void
 813 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 814 {
 815         int ret;
 816
 817         ccw_device_set_timeout(cdev, 0);
 818         ret = ccw_device_cancel_halt_clear(cdev);
 819         if (ret == -EBUSY) {
 820                 ccw_device_set_timeout(cdev, 3*HZ);
 821                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 822                 return;
 823         }
 824         if (ret == -ENODEV)
 825                 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 826         else if (cdev->handler)
 827                 cdev->handler(cdev, cdev->private->intparm,
 828                               ERR_PTR(-ETIMEDOUT));
 829 }
 830
 831 /*
 832  * Got an interrupt for a basic sense.
 833  */
 834 static void
 835 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 836 {
 837         struct irb *irb;
 838
 839         irb = (struct irb *) __LC_IRB;
 840         /* Check for unsolicited interrupt. */
 841         if (irb->scsw.stctl ==
 842                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 843                 if (irb->scsw.cc == 1)
 844                         /* Basic sense hasn't started. Try again. */
 845                         ccw_device_do_sense(cdev, irb);
 846                 else {
 847                         CIO_MSG_EVENT(2, "Huh? 0.%x.%04x: unsolicited "
 848                                       "interrupt during w4sense...\n",
 849                                       cdev->private->dev_id.ssid,
 850                                       cdev->private->dev_id.devno);
 851                         if (cdev->handler)
 852                                 cdev->handler (cdev, 0, irb);
 853                 }
 854                 return;
 855         }
 856         /*
 857          * Check if a halt or clear has been issued in the meanwhile. If yes,
 858          * only deliver the halt/clear interrupt to the device driver as if it
 859          * had killed the original request.
 860          */
 861         if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
 862                 /* Retry Basic Sense if requested. */
 863                 if (cdev->private->flags.intretry) {
 864                         cdev->private->flags.intretry = 0;
 865                         ccw_device_do_sense(cdev, irb);
 866                         return;
 867                 }
 868                 cdev->private->flags.dosense = 0;
 869                 memset(&cdev->private->irb, 0, sizeof(struct irb));
 870                 ccw_device_accumulate_irb(cdev, irb);
 871                 goto call_handler;
 872         }
 873         /* Add basic sense info to irb. */
 874         ccw_device_accumulate_basic_sense(cdev, irb);
 875         if (cdev->private->flags.dosense) {
 876                 /* Another basic sense is needed. */
 877                 ccw_device_do_sense(cdev, irb);
 878                 return;
 879         }
 880 call_handler:
 881         cdev->private->state = DEV_STATE_ONLINE;
 882         /* Call the handler. */
 883         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 884                 /* Start delayed path verification. */
 885                 ccw_device_online_verify(cdev, 0);
 886 }
 887
 888 static void
 889 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 890 {
 891         struct irb *irb;
 892
 893         irb = (struct irb *) __LC_IRB;
 894         /* Accumulate status. We don't do basic sense. */
 895         ccw_device_accumulate_irb(cdev, irb);
 896         /* Remember to clear irb to avoid residuals. */
 897         memset(&cdev->private->irb, 0, sizeof(struct irb));
 898         /* Try to start delayed device verification. */
 899         ccw_device_online_verify(cdev, 0);
 900         /* Note: Don't call handler for cio initiated clear! */
 901 }
 902
 903 static void
 904 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
 905 {
 906         struct subchannel *sch;
 907
 908         sch = to_subchannel(cdev->dev.parent);
 909         ccw_device_set_timeout(cdev, 0);
 910         /* Start delayed path verification. */
 911         ccw_device_online_verify(cdev, 0);
 912         /* OK, i/o is dead now. Call interrupt handler. */
 913         if (cdev->handler)
 914                 cdev->handler(cdev, cdev->private->intparm,
 915                               ERR_PTR(-EIO));
 916 }
 917
 918 static void
 919 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 920 {
 921         int ret;
 922
 923         ret = ccw_device_cancel_halt_clear(cdev);
 924         if (ret == -EBUSY) {
 925                 ccw_device_set_timeout(cdev, 3*HZ);
 926                 return;
 927         }
 928         /* Start delayed path verification. */
 929         ccw_device_online_verify(cdev, 0);
 930         if (cdev->handler)
 931                 cdev->handler(cdev, cdev->private->intparm,
 932                               ERR_PTR(-EIO));
 933 }
 934
 935 void device_kill_io(struct subchannel *sch)
 936 {
 937         int ret;
 938         struct ccw_device *cdev;
 939
 940         cdev = sch->dev.driver_data;
 941         ret = ccw_device_cancel_halt_clear(cdev);
 942         if (ret == -EBUSY) {
 943                 ccw_device_set_timeout(cdev, 3*HZ);
 944                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 945                 return;
 946         }
 947         /* Start delayed path verification. */
 948         ccw_device_online_verify(cdev, 0);
 949         if (cdev->handler)
 950                 cdev->handler(cdev, cdev->private->intparm,
 951                               ERR_PTR(-EIO));
 952 }
 953
 954 static void
 955 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
 956 {
 957         /* Start verification after current task finished. */
 958         cdev->private->flags.doverify = 1;
 959 }
 960
 961 static void
 962 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
 963 {
 964         struct irb *irb;
 965
 966         switch (dev_event) {
 967         case DEV_EVENT_INTERRUPT:
 968                 irb = (struct irb *) __LC_IRB;
 969                 /* Check for unsolicited interrupt. */
 970                 if ((irb->scsw.stctl ==
 971                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
 972                     (!irb->scsw.cc))
 973                         /* FIXME: we should restart stlck here, but this
 974                          * is extremely unlikely ... */
 975                         goto out_wakeup;
 976
 977                 ccw_device_accumulate_irb(cdev, irb);
 978                 /* We don't care about basic sense etc. */
 979                 break;
 980         default: /* timeout */
 981                 break;
 982         }
 983 out_wakeup:
 984         wake_up(&cdev->private->wait_q);
 985 }
 986
 987 static void
 988 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
 989 {
 990         struct subchannel *sch;
 991
 992         sch = to_subchannel(cdev->dev.parent);
 993         if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
 994                 /* Couldn't enable the subchannel for i/o. Sick device. */
 995                 return;
 996
 997         /* After 60s the device recognition is considered to have failed. */
 998         ccw_device_set_timeout(cdev, 60*HZ);
 999
1000         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1001         ccw_device_sense_id_start(cdev);
1002 }
1003
1004 void
1005 device_trigger_reprobe(struct subchannel *sch)
1006 {
1007         struct ccw_device *cdev;
1008
1009         if (!sch->dev.driver_data)
1010                 return;
1011         cdev = sch->dev.driver_data;
1012         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1013                 return;
1014
1015         /* Update some values. */
1016         if (stsch(sch->schid, &sch->schib))
1017                 return;
1018         if (!sch->schib.pmcw.dnv)
1019                 return;
1020         /*
1021          * The pim, pam, pom values may not be accurate, but they are the best
1022          * we have before performing device selection :/
1023          */
1024         sch->lpm = sch->schib.pmcw.pam & sch->opm;
1025         /* Re-set some bits in the pmcw that were lost. */
1026         sch->schib.pmcw.isc = 3;
1027         sch->schib.pmcw.csense = 1;
1028         sch->schib.pmcw.ena = 0;
1029         if ((sch->lpm & (sch->lpm - 1)) != 0)
1030                 sch->schib.pmcw.mp = 1;
1031         sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1032         /* We should also udate ssd info, but this has to wait. */
1033         /* Check if this is another device which appeared on the same sch. */
1034         if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1035                 PREPARE_WORK(&cdev->private->kick_work,
1036                              ccw_device_move_to_orphanage);
1037                 queue_work(slow_path_wq, &cdev->private->kick_work);
1038         } else
1039                 ccw_device_start_id(cdev, 0);
1040 }
1041
1042 static void
1043 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1044 {
1045         struct subchannel *sch;
1046
1047         sch = to_subchannel(cdev->dev.parent);
1048         /*
1049          * An interrupt in state offline means a previous disable was not
1050          * successful. Try again.
1051          */
1052         cio_disable_subchannel(sch);
1053 }
1054
1055 static void
1056 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1057 {
1058         retry_set_schib(cdev);
1059         cdev->private->state = DEV_STATE_ONLINE;
1060         dev_fsm_event(cdev, dev_event);
1061 }
1062
1063 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1064                                        enum dev_event dev_event)
1065 {
1066         cmf_retry_copy_block(cdev);
1067         cdev->private->state = DEV_STATE_ONLINE;
1068         dev_fsm_event(cdev, dev_event);
1069 }
1070
1071 static void
1072 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1073 {
1074         ccw_device_set_timeout(cdev, 0);
1075         if (dev_event == DEV_EVENT_NOTOPER)
1076                 cdev->private->state = DEV_STATE_NOT_OPER;
1077         else
1078                 cdev->private->state = DEV_STATE_OFFLINE;
1079         wake_up(&cdev->private->wait_q);
1080 }
1081
1082 static void
1083 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1084 {
1085         int ret;
1086
1087         ret = ccw_device_cancel_halt_clear(cdev);
1088         switch (ret) {
1089         case 0:
1090                 cdev->private->state = DEV_STATE_OFFLINE;
1091                 wake_up(&cdev->private->wait_q);
1092                 break;
1093         case -ENODEV:
1094                 cdev->private->state = DEV_STATE_NOT_OPER;
1095                 wake_up(&cdev->private->wait_q);
1096                 break;
1097         default:
1098                 ccw_device_set_timeout(cdev, HZ/10);
1099         }
1100 }
1101
1102 /*
1103  * No operation action. This is used e.g. to ignore a timeout event in
1104  * state offline.
1105  */
1106 static void
1107 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1108 {
1109 }
1110
1111 /*
1112  * Bug operation action.
1113  */
1114 static void
1115 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1116 {
1117         CIO_MSG_EVENT(0, "dev_jumptable[%i][%i] == NULL\n",
1118                       cdev->private->state, dev_event);
1119         BUG();
1120 }
1121
1122 /*
1123  * device statemachine
1124  */
1125 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1126         [DEV_STATE_NOT_OPER] = {
1127                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1128                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1129                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1130                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1131         },
1132         [DEV_STATE_SENSE_PGID] = {
1133                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1134                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1135                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1136                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1137         },
1138         [DEV_STATE_SENSE_ID] = {
1139                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1140                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1141                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1142                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1143         },
1144         [DEV_STATE_OFFLINE] = {
1145                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1146                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1147                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1148                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1149         },
1150         [DEV_STATE_VERIFY] = {
1151                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1152                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1153                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1154                 [DEV_EVENT_VERIFY]      = ccw_device_delay_verify,
1155         },
1156         [DEV_STATE_ONLINE] = {
1157                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1158                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1159                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1160                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1161         },
1162         [DEV_STATE_W4SENSE] = {
1163                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1164                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1165                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1166                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1167         },
1168         [DEV_STATE_DISBAND_PGID] = {
1169                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1170                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1171                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1172                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1173         },
1174         [DEV_STATE_BOXED] = {
1175                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1176                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1177                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1178                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1179         },
1180         /* states to wait for i/o completion before doing something */
1181         [DEV_STATE_CLEAR_VERIFY] = {
1182                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1183                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1184                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1185                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1186         },
1187         [DEV_STATE_TIMEOUT_KILL] = {
1188                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1189                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1190                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1191                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1192         },
1193         [DEV_STATE_QUIESCE] = {
1194                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1195                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1196                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1197                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1198         },
1199         /* special states for devices gone not operational */
1200         [DEV_STATE_DISCONNECTED] = {
1201                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1202                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1203                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1204                 [DEV_EVENT_VERIFY]      = ccw_device_start_id,
1205         },
1206         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1207                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1208                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1209                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1210                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1211         },
1212         [DEV_STATE_CMFCHANGE] = {
1213                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1214                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1215                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1216                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1217         },
1218         [DEV_STATE_CMFUPDATE] = {
1219                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1220                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1221                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1222                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1223         },
1224 };
1225
1226 /*
1227  * io_subchannel_irq is called for "real" interrupts or for status
1228  * pending conditions on msch.
1229  */
1230 void
1231 io_subchannel_irq (struct device *pdev)
1232 {
1233         struct ccw_device *cdev;
1234
1235         cdev = to_subchannel(pdev)->dev.driver_data;
1236
1237         CIO_TRACE_EVENT (3, "IRQ");
1238         CIO_TRACE_EVENT (3, pdev->bus_id);
1239         if (cdev)
1240                 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1241 }
1242
1243 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);