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(cohuck@de.ibm.com)
   8  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/config.h>
  13 #include <linux/init.h>
  14
  15 #include <asm/ccwdev.h>
  16 #include <asm/qdio.h>
  17
  18 #include "cio.h"
  19 #include "cio_debug.h"
  20 #include "css.h"
  21 #include "device.h"
  22 #include "chsc.h"
  23 #include "ioasm.h"
  24 #include "qdio.h"
  25
  26 int
  27 device_is_online(struct subchannel *sch)
  28 {
  29         struct ccw_device *cdev;
  30
  31         if (!sch->dev.driver_data)
  32                 return 0;
  33         cdev = sch->dev.driver_data;
  34         return (cdev->private->state == DEV_STATE_ONLINE);
  35 }
  36
  37 int
  38 device_is_disconnected(struct subchannel *sch)
  39 {
  40         struct ccw_device *cdev;
  41
  42         if (!sch->dev.driver_data)
  43                 return 0;
  44         cdev = sch->dev.driver_data;
  45         return (cdev->private->state == DEV_STATE_DISCONNECTED ||
  46                 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
  47 }
  48
  49 void
  50 device_set_disconnected(struct subchannel *sch)
  51 {
  52         struct ccw_device *cdev;
  53
  54         if (!sch->dev.driver_data)
  55                 return;
  56         cdev = sch->dev.driver_data;
  57         ccw_device_set_timeout(cdev, 0);
  58         cdev->private->flags.fake_irb = 0;
  59         cdev->private->state = DEV_STATE_DISCONNECTED;
  60 }
  61
  62 void
  63 device_set_waiting(struct subchannel *sch)
  64 {
  65         struct ccw_device *cdev;
  66
  67         if (!sch->dev.driver_data)
  68                 return;
  69         cdev = sch->dev.driver_data;
  70         ccw_device_set_timeout(cdev, 10*HZ);
  71         cdev->private->state = DEV_STATE_WAIT4IO;
  72 }
  73
  74 /*
  75  * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
  76  */
  77 static void
  78 ccw_device_timeout(unsigned long data)
  79 {
  80         struct ccw_device *cdev;
  81
  82         cdev = (struct ccw_device *) data;
  83         spin_lock_irq(cdev->ccwlock);
  84         dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
  85         spin_unlock_irq(cdev->ccwlock);
  86 }
  87
  88 /*
  89  * Set timeout
  90  */
  91 void
  92 ccw_device_set_timeout(struct ccw_device *cdev, int expires)
  93 {
  94         if (expires == 0) {
  95                 del_timer(&cdev->private->timer);
  96                 return;
  97         }
  98         if (timer_pending(&cdev->private->timer)) {
  99                 if (mod_timer(&cdev->private->timer, jiffies + expires))
 100                         return;
 101         }
 102         cdev->private->timer.function = ccw_device_timeout;
 103         cdev->private->timer.data = (unsigned long) cdev;
 104         cdev->private->timer.expires = jiffies + expires;
 105         add_timer(&cdev->private->timer);
 106 }
 107
 108 /* Kill any pending timers after machine check. */
 109 void
 110 device_kill_pending_timer(struct subchannel *sch)
 111 {
 112         struct ccw_device *cdev;
 113
 114         if (!sch->dev.driver_data)
 115                 return;
 116         cdev = sch->dev.driver_data;
 117         ccw_device_set_timeout(cdev, 0);
 118 }
 119
 120 /*
 121  * Cancel running i/o. This is called repeatedly since halt/clear are
 122  * asynchronous operations. We do one try with cio_cancel, two tries
 123  * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
 124  * Returns 0 if device now idle, -ENODEV for device not operational and
 125  * -EBUSY if an interrupt is expected (either from halt/clear or from a
 126  * status pending).
 127  */
 128 int
 129 ccw_device_cancel_halt_clear(struct ccw_device *cdev)
 130 {
 131         struct subchannel *sch;
 132         int ret;
 133
 134         sch = to_subchannel(cdev->dev.parent);
 135         ret = stsch(sch->irq, &sch->schib);
 136         if (ret || !sch->schib.pmcw.dnv)
 137                 return -ENODEV;
 138         if (!sch->schib.pmcw.ena || sch->schib.scsw.actl == 0)
 139                 /* Not operational or no activity -> done. */
 140                 return 0;
 141         /* Stage 1: cancel io. */
 142         if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) &&
 143             !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
 144                 ret = cio_cancel(sch);
 145                 if (ret != -EINVAL)
 146                         return ret;
 147                 /* cancel io unsuccessful. From now on it is asynchronous. */
 148                 cdev->private->iretry = 3;      /* 3 halt retries. */
 149         }
 150         if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
 151                 /* Stage 2: halt io. */
 152                 if (cdev->private->iretry) {
 153                         cdev->private->iretry--;
 154                         ret = cio_halt(sch);
 155                         return (ret == 0) ? -EBUSY : ret;
 156                 }
 157                 /* halt io unsuccessful. */
 158                 cdev->private->iretry = 255;    /* 255 clear retries. */
 159         }
 160         /* Stage 3: clear io. */
 161         if (cdev->private->iretry) {
 162                 cdev->private->iretry--;
 163                 ret = cio_clear (sch);
 164                 return (ret == 0) ? -EBUSY : ret;
 165         }
 166         panic("Can't stop i/o on subchannel.\n");
 167 }
 168
 169 static int
 170 ccw_device_handle_oper(struct ccw_device *cdev)
 171 {
 172         struct subchannel *sch;
 173
 174         sch = to_subchannel(cdev->dev.parent);
 175         cdev->private->flags.recog_done = 1;
 176         /*
 177          * Check if cu type and device type still match. If
 178          * not, it is certainly another device and we have to
 179          * de- and re-register. Also check here for non-matching devno.
 180          */
 181         if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
 182             cdev->id.cu_model != cdev->private->senseid.cu_model ||
 183             cdev->id.dev_type != cdev->private->senseid.dev_type ||
 184             cdev->id.dev_model != cdev->private->senseid.dev_model ||
 185             cdev->private->devno != sch->schib.pmcw.dev) {
 186                 PREPARE_WORK(&cdev->private->kick_work,
 187                              ccw_device_do_unreg_rereg, (void *)cdev);
 188                 queue_work(ccw_device_work, &cdev->private->kick_work);
 189                 return 0;
 190         }
 191         cdev->private->flags.donotify = 1;
 192         return 1;
 193 }
 194
 195 /*
 196  * The machine won't give us any notification by machine check if a chpid has
 197  * been varied online on the SE so we have to find out by magic (i. e. driving
 198  * the channel subsystem to device selection and updating our path masks).
 199  */
 200 static inline void
 201 __recover_lost_chpids(struct subchannel *sch, int old_lpm)
 202 {
 203         int mask, i;
 204
 205         for (i = 0; i<8; i++) {
 206                 mask = 0x80 >> i;
 207                 if (!(sch->lpm & mask))
 208                         continue;
 209                 if (old_lpm & mask)
 210                         continue;
 211                 chpid_is_actually_online(sch->schib.pmcw.chpid[i]);
 212         }
 213 }
 214
 215 /*
 216  * Stop device recognition.
 217  */
 218 static void
 219 ccw_device_recog_done(struct ccw_device *cdev, int state)
 220 {
 221         struct subchannel *sch;
 222         int notify, old_lpm, same_dev;
 223
 224         sch = to_subchannel(cdev->dev.parent);
 225
 226         ccw_device_set_timeout(cdev, 0);
 227         cio_disable_subchannel(sch);
 228         /*
 229          * Now that we tried recognition, we have performed device selection
 230          * through ssch() and the path information is up to date.
 231          */
 232         old_lpm = sch->lpm;
 233         stsch(sch->irq, &sch->schib);
 234         sch->lpm = sch->schib.pmcw.pim &
 235                 sch->schib.pmcw.pam &
 236                 sch->schib.pmcw.pom &
 237                 sch->opm;
 238         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
 239                 /* Force reprobe on all chpids. */
 240                 old_lpm = 0;
 241         if (sch->lpm != old_lpm)
 242                 __recover_lost_chpids(sch, old_lpm);
 243         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 244                 if (state == DEV_STATE_NOT_OPER) {
 245                         cdev->private->flags.recog_done = 1;
 246                         cdev->private->state = DEV_STATE_DISCONNECTED;
 247                         return;
 248                 }
 249                 /* Boxed devices don't need extra treatment. */
 250         }
 251         notify = 0;
 252         same_dev = 0; /* Keep the compiler quiet... */
 253         switch (state) {
 254         case DEV_STATE_NOT_OPER:
 255                 CIO_DEBUG(KERN_WARNING, 2,
 256                           "SenseID : unknown device %04x on subchannel %04x\n",
 257                           cdev->private->devno, sch->irq);
 258                 break;
 259         case DEV_STATE_OFFLINE:
 260                 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 261                         same_dev = ccw_device_handle_oper(cdev);
 262                         notify = 1;
 263                 }
 264                 /* fill out sense information */
 265                 cdev->id = (struct ccw_device_id) {
 266                         .cu_type   = cdev->private->senseid.cu_type,
 267                         .cu_model  = cdev->private->senseid.cu_model,
 268                         .dev_type  = cdev->private->senseid.dev_type,
 269                         .dev_model = cdev->private->senseid.dev_model,
 270                 };
 271                 if (notify) {
 272                         cdev->private->state = DEV_STATE_OFFLINE;
 273                         if (same_dev) {
 274                                 /* Get device online again. */
 275                                 ccw_device_online(cdev);
 276                                 wake_up(&cdev->private->wait_q);
 277                         }
 278                         return;
 279                 }
 280                 /* Issue device info message. */
 281                 CIO_DEBUG(KERN_INFO, 2, "SenseID : device %04x reports: "
 282                           "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
 283                           "%04X/%02X\n", cdev->private->devno,
 284                           cdev->id.cu_type, cdev->id.cu_model,
 285                           cdev->id.dev_type, cdev->id.dev_model);
 286                 break;
 287         case DEV_STATE_BOXED:
 288                 CIO_DEBUG(KERN_WARNING, 2,
 289                           "SenseID : boxed device %04x on subchannel %04x\n",
 290                           cdev->private->devno, sch->irq);
 291                 break;
 292         }
 293         cdev->private->state = state;
 294         io_subchannel_recog_done(cdev);
 295         if (state != DEV_STATE_NOT_OPER)
 296                 wake_up(&cdev->private->wait_q);
 297 }
 298
 299 /*
 300  * Function called from device_id.c after sense id has completed.
 301  */
 302 void
 303 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
 304 {
 305         switch (err) {
 306         case 0:
 307                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
 308                 break;
 309         case -ETIME:            /* Sense id stopped by timeout. */
 310                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 311                 break;
 312         default:
 313                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 314                 break;
 315         }
 316 }
 317
 318 static void
 319 ccw_device_oper_notify(void *data)
 320 {
 321         struct ccw_device *cdev;
 322         struct subchannel *sch;
 323         int ret;
 324
 325         cdev = (struct ccw_device *)data;
 326         sch = to_subchannel(cdev->dev.parent);
 327         ret = (sch->driver && sch->driver->notify) ?
 328                 sch->driver->notify(&sch->dev, CIO_OPER) : 0;
 329         if (!ret)
 330                 /* Driver doesn't want device back. */
 331                 ccw_device_do_unreg_rereg((void *)cdev);
 332         else
 333                 wake_up(&cdev->private->wait_q);
 334 }
 335
 336 /*
 337  * Finished with online/offline processing.
 338  */
 339 static void
 340 ccw_device_done(struct ccw_device *cdev, int state)
 341 {
 342         struct subchannel *sch;
 343
 344         sch = to_subchannel(cdev->dev.parent);
 345
 346         if (state != DEV_STATE_ONLINE)
 347                 cio_disable_subchannel(sch);
 348
 349         /* Reset device status. */
 350         memset(&cdev->private->irb, 0, sizeof(struct irb));
 351
 352         cdev->private->state = state;
 353
 354
 355         if (state == DEV_STATE_BOXED)
 356                 CIO_DEBUG(KERN_WARNING, 2,
 357                           "Boxed device %04x on subchannel %04x\n",
 358                           cdev->private->devno, sch->irq);
 359
 360         if (cdev->private->flags.donotify) {
 361                 cdev->private->flags.donotify = 0;
 362                 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify,
 363                              (void *)cdev);
 364                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 365         }
 366         wake_up(&cdev->private->wait_q);
 367
 368         if (css_init_done && state != DEV_STATE_ONLINE)
 369                 put_device (&cdev->dev);
 370 }
 371
 372 /*
 373  * Function called from device_pgid.c after sense path ground has completed.
 374  */
 375 void
 376 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
 377 {
 378         struct subchannel *sch;
 379
 380         sch = to_subchannel(cdev->dev.parent);
 381         switch (err) {
 382         case 0:
 383                 /* Start Path Group verification. */
 384                 sch->vpm = 0;   /* Start with no path groups set. */
 385                 cdev->private->state = DEV_STATE_VERIFY;
 386                 ccw_device_verify_start(cdev);
 387                 break;
 388         case -ETIME:            /* Sense path group id stopped by timeout. */
 389         case -EUSERS:           /* device is reserved for someone else. */
 390                 ccw_device_done(cdev, DEV_STATE_BOXED);
 391                 break;
 392         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 393                 cdev->private->options.pgroup = 0;
 394                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 395                 break;
 396         default:
 397                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 398                 break;
 399         }
 400 }
 401
 402 /*
 403  * Start device recognition.
 404  */
 405 int
 406 ccw_device_recognition(struct ccw_device *cdev)
 407 {
 408         struct subchannel *sch;
 409         int ret;
 410
 411         if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
 412             (cdev->private->state != DEV_STATE_BOXED))
 413                 return -EINVAL;
 414         sch = to_subchannel(cdev->dev.parent);
 415         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 416         if (ret != 0)
 417                 /* Couldn't enable the subchannel for i/o. Sick device. */
 418                 return ret;
 419
 420         /* After 60s the device recognition is considered to have failed. */
 421         ccw_device_set_timeout(cdev, 60*HZ);
 422
 423         /*
 424          * We used to start here with a sense pgid to find out whether a device
 425          * is locked by someone else. Unfortunately, the sense pgid command
 426          * code has other meanings on devices predating the path grouping
 427          * algorithm, so we start with sense id and box the device after an
 428          * timeout (or if sense pgid during path verification detects the device
 429          * is locked, as may happen on newer devices).
 430          */
 431         cdev->private->flags.recog_done = 0;
 432         cdev->private->state = DEV_STATE_SENSE_ID;
 433         ccw_device_sense_id_start(cdev);
 434         return 0;
 435 }
 436
 437 /*
 438  * Handle timeout in device recognition.
 439  */
 440 static void
 441 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 442 {
 443         int ret;
 444
 445         ret = ccw_device_cancel_halt_clear(cdev);
 446         switch (ret) {
 447         case 0:
 448                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 449                 break;
 450         case -ENODEV:
 451                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 452                 break;
 453         default:
 454                 ccw_device_set_timeout(cdev, 3*HZ);
 455         }
 456 }
 457
 458
 459 static void
 460 ccw_device_nopath_notify(void *data)
 461 {
 462         struct ccw_device *cdev;
 463         struct subchannel *sch;
 464         int ret;
 465
 466         cdev = (struct ccw_device *)data;
 467         sch = to_subchannel(cdev->dev.parent);
 468         /* Extra sanity. */
 469         if (sch->lpm)
 470                 return;
 471         ret = (sch->driver && sch->driver->notify) ?
 472                 sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0;
 473         if (!ret) {
 474                 if (get_device(&sch->dev)) {
 475                         /* Driver doesn't want to keep device. */
 476                         cio_disable_subchannel(sch);
 477                         if (get_device(&cdev->dev)) {
 478                                 PREPARE_WORK(&cdev->private->kick_work,
 479                                              ccw_device_call_sch_unregister,
 480                                              (void *)cdev);
 481                                 queue_work(ccw_device_work,
 482                                            &cdev->private->kick_work);
 483                         } else
 484                                 put_device(&sch->dev);
 485                 }
 486         } else {
 487                 cio_disable_subchannel(sch);
 488                 ccw_device_set_timeout(cdev, 0);
 489                 cdev->private->flags.fake_irb = 0;
 490                 cdev->private->state = DEV_STATE_DISCONNECTED;
 491                 wake_up(&cdev->private->wait_q);
 492         }
 493 }
 494
 495 void
 496 ccw_device_verify_done(struct ccw_device *cdev, int err)
 497 {
 498         cdev->private->flags.doverify = 0;
 499         switch (err) {
 500         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 501                 cdev->private->options.pgroup = 0;
 502         case 0:
 503                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 504                 /* Deliver fake irb to device driver, if needed. */
 505                 if (cdev->private->flags.fake_irb) {
 506                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 507                         cdev->private->irb.scsw = (struct scsw) {
 508                                 .cc = 1,
 509                                 .fctl = SCSW_FCTL_START_FUNC,
 510                                 .actl = SCSW_ACTL_START_PEND,
 511                                 .stctl = SCSW_STCTL_STATUS_PEND,
 512                         };
 513                         cdev->private->flags.fake_irb = 0;
 514                         if (cdev->handler)
 515                                 cdev->handler(cdev, cdev->private->intparm,
 516                                               &cdev->private->irb);
 517                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 518                 }
 519                 break;
 520         case -ETIME:
 521                 ccw_device_done(cdev, DEV_STATE_BOXED);
 522                 break;
 523         default:
 524                 PREPARE_WORK(&cdev->private->kick_work,
 525                              ccw_device_nopath_notify, (void *)cdev);
 526                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 527                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 528                 break;
 529         }
 530 }
 531
 532 /*
 533  * Get device online.
 534  */
 535 int
 536 ccw_device_online(struct ccw_device *cdev)
 537 {
 538         struct subchannel *sch;
 539         int ret;
 540
 541         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 542             (cdev->private->state != DEV_STATE_BOXED))
 543                 return -EINVAL;
 544         sch = to_subchannel(cdev->dev.parent);
 545         if (css_init_done && !get_device(&cdev->dev))
 546                 return -ENODEV;
 547         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 548         if (ret != 0) {
 549                 /* Couldn't enable the subchannel for i/o. Sick device. */
 550                 if (ret == -ENODEV)
 551                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 552                 return ret;
 553         }
 554         /* Do we want to do path grouping? */
 555         if (!cdev->private->options.pgroup) {
 556                 /* No, set state online immediately. */
 557                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 558                 return 0;
 559         }
 560         /* Do a SensePGID first. */
 561         cdev->private->state = DEV_STATE_SENSE_PGID;
 562         ccw_device_sense_pgid_start(cdev);
 563         return 0;
 564 }
 565
 566 void
 567 ccw_device_disband_done(struct ccw_device *cdev, int err)
 568 {
 569         switch (err) {
 570         case 0:
 571                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 572                 break;
 573         case -ETIME:
 574                 ccw_device_done(cdev, DEV_STATE_BOXED);
 575                 break;
 576         default:
 577                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 578                 break;
 579         }
 580 }
 581
 582 /*
 583  * Shutdown device.
 584  */
 585 int
 586 ccw_device_offline(struct ccw_device *cdev)
 587 {
 588         struct subchannel *sch;
 589
 590         sch = to_subchannel(cdev->dev.parent);
 591         if (stsch(sch->irq, &sch->schib) || !sch->schib.pmcw.dnv)
 592                 return -ENODEV;
 593         if (cdev->private->state != DEV_STATE_ONLINE) {
 594                 if (sch->schib.scsw.actl != 0)
 595                         return -EBUSY;
 596                 return -EINVAL;
 597         }
 598         if (sch->schib.scsw.actl != 0)
 599                 return -EBUSY;
 600         /* Are we doing path grouping? */
 601         if (!cdev->private->options.pgroup) {
 602                 /* No, set state offline immediately. */
 603                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 604                 return 0;
 605         }
 606         /* Start Set Path Group commands. */
 607         cdev->private->state = DEV_STATE_DISBAND_PGID;
 608         ccw_device_disband_start(cdev);
 609         return 0;
 610 }
 611
 612 /*
 613  * Handle timeout in device online/offline process.
 614  */
 615 static void
 616 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 617 {
 618         int ret;
 619
 620         ret = ccw_device_cancel_halt_clear(cdev);
 621         switch (ret) {
 622         case 0:
 623                 ccw_device_done(cdev, DEV_STATE_BOXED);
 624                 break;
 625         case -ENODEV:
 626                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 627                 break;
 628         default:
 629                 ccw_device_set_timeout(cdev, 3*HZ);
 630         }
 631 }
 632
 633 /*
 634  * Handle not oper event in device recognition.
 635  */
 636 static void
 637 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 638 {
 639         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 640 }
 641
 642 /*
 643  * Handle not operational event while offline.
 644  */
 645 static void
 646 ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 647 {
 648         struct subchannel *sch;
 649
 650         cdev->private->state = DEV_STATE_NOT_OPER;
 651         sch = to_subchannel(cdev->dev.parent);
 652         if (get_device(&cdev->dev)) {
 653                 PREPARE_WORK(&cdev->private->kick_work,
 654                              ccw_device_call_sch_unregister, (void *)cdev);
 655                 queue_work(ccw_device_work, &cdev->private->kick_work);
 656         }
 657         wake_up(&cdev->private->wait_q);
 658 }
 659
 660 /*
 661  * Handle not operational event while online.
 662  */
 663 static void
 664 ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 665 {
 666         struct subchannel *sch;
 667
 668         sch = to_subchannel(cdev->dev.parent);
 669         if (sch->driver->notify &&
 670             sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) {
 671                         ccw_device_set_timeout(cdev, 0);
 672                         cdev->private->flags.fake_irb = 0;
 673                         cdev->private->state = DEV_STATE_DISCONNECTED;
 674                         wake_up(&cdev->private->wait_q);
 675                         return;
 676         }
 677         cdev->private->state = DEV_STATE_NOT_OPER;
 678         cio_disable_subchannel(sch);
 679         if (sch->schib.scsw.actl != 0) {
 680                 // FIXME: not-oper indication to device driver ?
 681                 ccw_device_call_handler(cdev);
 682         }
 683         if (get_device(&cdev->dev)) {
 684                 PREPARE_WORK(&cdev->private->kick_work,
 685                              ccw_device_call_sch_unregister, (void *)cdev);
 686                 queue_work(ccw_device_work, &cdev->private->kick_work);
 687         }
 688         wake_up(&cdev->private->wait_q);
 689 }
 690
 691 /*
 692  * Handle path verification event.
 693  */
 694 static void
 695 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 696 {
 697         struct subchannel *sch;
 698
 699         if (!cdev->private->options.pgroup)
 700                 return;
 701         if (cdev->private->state == DEV_STATE_W4SENSE) {
 702                 cdev->private->flags.doverify = 1;
 703                 return;
 704         }
 705         sch = to_subchannel(cdev->dev.parent);
 706         /*
 707          * Since we might not just be coming from an interrupt from the
 708          * subchannel we have to update the schib.
 709          */
 710         stsch(sch->irq, &sch->schib);
 711
 712         if (sch->schib.scsw.actl != 0 ||
 713             (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
 714                 /*
 715                  * No final status yet or final status not yet delivered
 716                  * to the device driver. Can't do path verfication now,
 717                  * delay until final status was delivered.
 718                  */
 719                 cdev->private->flags.doverify = 1;
 720                 return;
 721         }
 722         /* Device is idle, we can do the path verification. */
 723         cdev->private->state = DEV_STATE_VERIFY;
 724         ccw_device_verify_start(cdev);
 725 }
 726
 727 /*
 728  * Got an interrupt for a normal io (state online).
 729  */
 730 static void
 731 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 732 {
 733         struct irb *irb;
 734
 735         irb = (struct irb *) __LC_IRB;
 736         /* Check for unsolicited interrupt. */
 737         if ((irb->scsw.stctl ==
 738                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
 739             && (!irb->scsw.cc)) {
 740                 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 741                     !irb->esw.esw0.erw.cons) {
 742                         /* Unit check but no sense data. Need basic sense. */
 743                         if (ccw_device_do_sense(cdev, irb) != 0)
 744                                 goto call_handler_unsol;
 745                         memcpy(irb, &cdev->private->irb, sizeof(struct irb));
 746                         cdev->private->state = DEV_STATE_W4SENSE;
 747                         cdev->private->intparm = 0;
 748                         return;
 749                 }
 750 call_handler_unsol:
 751                 if (cdev->handler)
 752                         cdev->handler (cdev, 0, irb);
 753                 return;
 754         }
 755         /* Accumulate status and find out if a basic sense is needed. */
 756         ccw_device_accumulate_irb(cdev, irb);
 757         if (cdev->private->flags.dosense) {
 758                 if (ccw_device_do_sense(cdev, irb) == 0) {
 759                         cdev->private->state = DEV_STATE_W4SENSE;
 760                 }
 761                 return;
 762         }
 763         /* Call the handler. */
 764         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 765                 /* Start delayed path verification. */
 766                 ccw_device_online_verify(cdev, 0);
 767 }
 768
 769 /*
 770  * Got an timeout in online state.
 771  */
 772 static void
 773 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 774 {
 775         int ret;
 776
 777         ccw_device_set_timeout(cdev, 0);
 778         ret = ccw_device_cancel_halt_clear(cdev);
 779         if (ret == -EBUSY) {
 780                 ccw_device_set_timeout(cdev, 3*HZ);
 781                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 782                 return;
 783         }
 784         if (ret == -ENODEV) {
 785                 struct subchannel *sch;
 786
 787                 sch = to_subchannel(cdev->dev.parent);
 788                 if (!sch->lpm) {
 789                         PREPARE_WORK(&cdev->private->kick_work,
 790                                      ccw_device_nopath_notify, (void *)cdev);
 791                         queue_work(ccw_device_notify_work,
 792                                    &cdev->private->kick_work);
 793                 } else
 794                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 795         } else if (cdev->handler)
 796                 cdev->handler(cdev, cdev->private->intparm,
 797                               ERR_PTR(-ETIMEDOUT));
 798 }
 799
 800 /*
 801  * Got an interrupt for a basic sense.
 802  */
 803 void
 804 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 805 {
 806         struct irb *irb;
 807
 808         irb = (struct irb *) __LC_IRB;
 809         /* Check for unsolicited interrupt. */
 810         if (irb->scsw.stctl ==
 811                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 812                 if (irb->scsw.cc == 1)
 813                         /* Basic sense hasn't started. Try again. */
 814                         ccw_device_do_sense(cdev, irb);
 815                 else {
 816                         printk("Huh? %s(%s): unsolicited interrupt...\n",
 817                                __FUNCTION__, cdev->dev.bus_id);
 818                         if (cdev->handler)
 819                                 cdev->handler (cdev, 0, irb);
 820                 }
 821                 return;
 822         }
 823         /* Add basic sense info to irb. */
 824         ccw_device_accumulate_basic_sense(cdev, irb);
 825         if (cdev->private->flags.dosense) {
 826                 /* Another basic sense is needed. */
 827                 ccw_device_do_sense(cdev, irb);
 828                 return;
 829         }
 830         cdev->private->state = DEV_STATE_ONLINE;
 831         /* Call the handler. */
 832         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 833                 /* Start delayed path verification. */
 834                 ccw_device_online_verify(cdev, 0);
 835 }
 836
 837 static void
 838 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 839 {
 840         struct irb *irb;
 841
 842         irb = (struct irb *) __LC_IRB;
 843         /* Accumulate status. We don't do basic sense. */
 844         ccw_device_accumulate_irb(cdev, irb);
 845         /* Try to start delayed device verification. */
 846         ccw_device_online_verify(cdev, 0);
 847         /* Note: Don't call handler for cio initiated clear! */
 848 }
 849
 850 static void
 851 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
 852 {
 853         struct subchannel *sch;
 854
 855         sch = to_subchannel(cdev->dev.parent);
 856         ccw_device_set_timeout(cdev, 0);
 857         /* OK, i/o is dead now. Call interrupt handler. */
 858         cdev->private->state = DEV_STATE_ONLINE;
 859         if (cdev->handler)
 860                 cdev->handler(cdev, cdev->private->intparm,
 861                               ERR_PTR(-ETIMEDOUT));
 862         if (!sch->lpm) {
 863                 PREPARE_WORK(&cdev->private->kick_work,
 864                              ccw_device_nopath_notify, (void *)cdev);
 865                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 866         } else if (cdev->private->flags.doverify)
 867                 /* Start delayed path verification. */
 868                 ccw_device_online_verify(cdev, 0);
 869 }
 870
 871 static void
 872 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 873 {
 874         int ret;
 875
 876         ret = ccw_device_cancel_halt_clear(cdev);
 877         if (ret == -EBUSY) {
 878                 ccw_device_set_timeout(cdev, 3*HZ);
 879                 return;
 880         }
 881         if (ret == -ENODEV) {
 882                 struct subchannel *sch;
 883
 884                 sch = to_subchannel(cdev->dev.parent);
 885                 if (!sch->lpm) {
 886                         PREPARE_WORK(&cdev->private->kick_work,
 887                                      ccw_device_nopath_notify, (void *)cdev);
 888                         queue_work(ccw_device_notify_work,
 889                                    &cdev->private->kick_work);
 890                 } else
 891                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 892                 return;
 893         }
 894         //FIXME: Can we get here?
 895         cdev->private->state = DEV_STATE_ONLINE;
 896         if (cdev->handler)
 897                 cdev->handler(cdev, cdev->private->intparm,
 898                               ERR_PTR(-ETIMEDOUT));
 899 }
 900
 901 static void
 902 ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event)
 903 {
 904         struct irb *irb;
 905         struct subchannel *sch;
 906
 907         irb = (struct irb *) __LC_IRB;
 908         /*
 909          * Accumulate status and find out if a basic sense is needed.
 910          * This is fine since we have already adapted the lpm.
 911          */
 912         ccw_device_accumulate_irb(cdev, irb);
 913         if (cdev->private->flags.dosense) {
 914                 if (ccw_device_do_sense(cdev, irb) == 0) {
 915                         cdev->private->state = DEV_STATE_W4SENSE;
 916                 }
 917                 return;
 918         }
 919
 920         /* Iff device is idle, reset timeout. */
 921         sch = to_subchannel(cdev->dev.parent);
 922         if (!stsch(sch->irq, &sch->schib))
 923                 if (sch->schib.scsw.actl == 0)
 924                         ccw_device_set_timeout(cdev, 0);
 925         /* Call the handler. */
 926         ccw_device_call_handler(cdev);
 927         if (!sch->lpm) {
 928                 PREPARE_WORK(&cdev->private->kick_work,
 929                              ccw_device_nopath_notify, (void *)cdev);
 930                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 931         } else if (cdev->private->flags.doverify)
 932                 ccw_device_online_verify(cdev, 0);
 933 }
 934
 935 static void
 936 ccw_device_wait4io_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 937 {
 938         int ret;
 939         struct subchannel *sch;
 940
 941         sch = to_subchannel(cdev->dev.parent);
 942         ccw_device_set_timeout(cdev, 0);
 943         ret = ccw_device_cancel_halt_clear(cdev);
 944         if (ret == -EBUSY) {
 945                 ccw_device_set_timeout(cdev, 3*HZ);
 946                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 947                 return;
 948         }
 949         if (ret == -ENODEV) {
 950                 if (!sch->lpm) {
 951                         PREPARE_WORK(&cdev->private->kick_work,
 952                                      ccw_device_nopath_notify, (void *)cdev);
 953                         queue_work(ccw_device_notify_work,
 954                                    &cdev->private->kick_work);
 955                 } else
 956                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 957                 return;
 958         }
 959         if (cdev->handler)
 960                 cdev->handler(cdev, cdev->private->intparm,
 961                               ERR_PTR(-ETIMEDOUT));
 962         if (!sch->lpm) {
 963                 PREPARE_WORK(&cdev->private->kick_work,
 964                              ccw_device_nopath_notify, (void *)cdev);
 965                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 966         } else if (cdev->private->flags.doverify)
 967                 /* Start delayed path verification. */
 968                 ccw_device_online_verify(cdev, 0);
 969 }
 970
 971 static void
 972 ccw_device_wait4io_verify(struct ccw_device *cdev, enum dev_event dev_event)
 973 {
 974         /* When the I/O has terminated, we have to start verification. */
 975         if (cdev->private->options.pgroup)
 976                 cdev->private->flags.doverify = 1;
 977 }
 978
 979 static void
 980 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
 981 {
 982         struct irb *irb;
 983
 984         switch (dev_event) {
 985         case DEV_EVENT_INTERRUPT:
 986                 irb = (struct irb *) __LC_IRB;
 987                 /* Check for unsolicited interrupt. */
 988                 if ((irb->scsw.stctl ==
 989                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
 990                     (!irb->scsw.cc))
 991                         /* FIXME: we should restart stlck here, but this
 992                          * is extremely unlikely ... */
 993                         goto out_wakeup;
 994
 995                 ccw_device_accumulate_irb(cdev, irb);
 996                 /* We don't care about basic sense etc. */
 997                 break;
 998         default: /* timeout */
 999                 break;
1000         }
1001 out_wakeup:
1002         wake_up(&cdev->private->wait_q);
1003 }
1004
1005 static void
1006 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1007 {
1008         struct subchannel *sch;
1009
1010         sch = to_subchannel(cdev->dev.parent);
1011         if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1012                 /* Couldn't enable the subchannel for i/o. Sick device. */
1013                 return;
1014
1015         /* After 60s the device recognition is considered to have failed. */
1016         ccw_device_set_timeout(cdev, 60*HZ);
1017
1018         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1019         ccw_device_sense_id_start(cdev);
1020 }
1021
1022 void
1023 device_trigger_reprobe(struct subchannel *sch)
1024 {
1025         struct ccw_device *cdev;
1026
1027         if (!sch->dev.driver_data)
1028                 return;
1029         cdev = sch->dev.driver_data;
1030         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1031                 return;
1032
1033         /* Update some values. */
1034         if (stsch(sch->irq, &sch->schib))
1035                 return;
1036
1037         /*
1038          * The pim, pam, pom values may not be accurate, but they are the best
1039          * we have before performing device selection :/
1040          */
1041         sch->lpm = sch->schib.pmcw.pim &
1042                 sch->schib.pmcw.pam &
1043                 sch->schib.pmcw.pom &
1044                 sch->opm;
1045         /* Re-set some bits in the pmcw that were lost. */
1046         sch->schib.pmcw.isc = 3;
1047         sch->schib.pmcw.csense = 1;
1048         sch->schib.pmcw.ena = 0;
1049         if ((sch->lpm & (sch->lpm - 1)) != 0)
1050                 sch->schib.pmcw.mp = 1;
1051         sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1052         /* We should also udate ssd info, but this has to wait. */
1053         ccw_device_start_id(cdev, 0);
1054 }
1055
1056 static void
1057 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1058 {
1059         struct subchannel *sch;
1060
1061         sch = to_subchannel(cdev->dev.parent);
1062         /*
1063          * An interrupt in state offline means a previous disable was not
1064          * successful. Try again.
1065          */
1066         cio_disable_subchannel(sch);
1067 }
1068
1069 static void
1070 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1071 {
1072         retry_set_schib(cdev);
1073         cdev->private->state = DEV_STATE_ONLINE;
1074         dev_fsm_event(cdev, dev_event);
1075 }
1076
1077
1078 static void
1079 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1080 {
1081         ccw_device_set_timeout(cdev, 0);
1082         if (dev_event == DEV_EVENT_NOTOPER)
1083                 cdev->private->state = DEV_STATE_NOT_OPER;
1084         else
1085                 cdev->private->state = DEV_STATE_OFFLINE;
1086         wake_up(&cdev->private->wait_q);
1087 }
1088
1089 static void
1090 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1091 {
1092         int ret;
1093
1094         ret = ccw_device_cancel_halt_clear(cdev);
1095         switch (ret) {
1096         case 0:
1097                 cdev->private->state = DEV_STATE_OFFLINE;
1098                 wake_up(&cdev->private->wait_q);
1099                 break;
1100         case -ENODEV:
1101                 cdev->private->state = DEV_STATE_NOT_OPER;
1102                 wake_up(&cdev->private->wait_q);
1103                 break;
1104         default:
1105                 ccw_device_set_timeout(cdev, HZ/10);
1106         }
1107 }
1108
1109 /*
1110  * No operation action. This is used e.g. to ignore a timeout event in
1111  * state offline.
1112  */
1113 static void
1114 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1115 {
1116 }
1117
1118 /*
1119  * Bug operation action.
1120  */
1121 static void
1122 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1123 {
1124         printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
1125                cdev->private->state, dev_event);
1126         BUG();
1127 }
1128
1129 /*
1130  * device statemachine
1131  */
1132 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1133         [DEV_STATE_NOT_OPER] = {
1134                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1135                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1136                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1137                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1138         },
1139         [DEV_STATE_SENSE_PGID] = {
1140                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1141                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1142                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1143                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1144         },
1145         [DEV_STATE_SENSE_ID] = {
1146                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1147                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1148                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1149                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1150         },
1151         [DEV_STATE_OFFLINE] = {
1152                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1153                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1154                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1155                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1156         },
1157         [DEV_STATE_VERIFY] = {
1158                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1159                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1160                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1161                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1162         },
1163         [DEV_STATE_ONLINE] = {
1164                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1165                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1166                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1167                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1168         },
1169         [DEV_STATE_W4SENSE] = {
1170                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1171                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1172                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1173                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1174         },
1175         [DEV_STATE_DISBAND_PGID] = {
1176                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1177                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1178                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1179                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1180         },
1181         [DEV_STATE_BOXED] = {
1182                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1183                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1184                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1185                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1186         },
1187         /* states to wait for i/o completion before doing something */
1188         [DEV_STATE_CLEAR_VERIFY] = {
1189                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1190                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1191                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1192                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1193         },
1194         [DEV_STATE_TIMEOUT_KILL] = {
1195                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1196                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1197                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1198                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1199         },
1200         [DEV_STATE_WAIT4IO] = {
1201                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1202                 [DEV_EVENT_INTERRUPT]   = ccw_device_wait4io_irq,
1203                 [DEV_EVENT_TIMEOUT]     = ccw_device_wait4io_timeout,
1204                 [DEV_EVENT_VERIFY]      = ccw_device_wait4io_verify,
1205         },
1206         [DEV_STATE_QUIESCE] = {
1207                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1208                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1209                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1210                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1211         },
1212         /* special states for devices gone not operational */
1213         [DEV_STATE_DISCONNECTED] = {
1214                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1215                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1216                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1217                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1218         },
1219         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1220                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1221                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1222                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1223                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1224         },
1225         [DEV_STATE_CMFCHANGE] = {
1226                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1227                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1228                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1229                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1230         },
1231 };
1232
1233 /*
1234  * io_subchannel_irq is called for "real" interrupts or for status
1235  * pending conditions on msch.
1236  */
1237 void
1238 io_subchannel_irq (struct device *pdev)
1239 {
1240         struct ccw_device *cdev;
1241
1242         cdev = to_subchannel(pdev)->dev.driver_data;
1243
1244         CIO_TRACE_EVENT (3, "IRQ");
1245         CIO_TRACE_EVENT (3, pdev->bus_id);
1246         if (cdev)
1247                 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1248 }
1249
1250 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);