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
  19 #include "cio.h"
  20 #include "cio_debug.h"
  21 #include "css.h"
  22 #include "device.h"
  23 #include "chsc.h"
  24 #include "ioasm.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->schid, &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->schid, &sch->schib);
 234         sch->lpm = sch->schib.pmcw.pim &
 235                 sch->schib.pmcw.pam &
 236                 sch->schib.pmcw.pom &
 237                 sch->opm;
 238         /* Check since device may again have become not operational. */
 239         if (!sch->schib.pmcw.dnv)
 240                 state = DEV_STATE_NOT_OPER;
 241         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
 242                 /* Force reprobe on all chpids. */
 243                 old_lpm = 0;
 244         if (sch->lpm != old_lpm)
 245                 __recover_lost_chpids(sch, old_lpm);
 246         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 247                 if (state == DEV_STATE_NOT_OPER) {
 248                         cdev->private->flags.recog_done = 1;
 249                         cdev->private->state = DEV_STATE_DISCONNECTED;
 250                         return;
 251                 }
 252                 /* Boxed devices don't need extra treatment. */
 253         }
 254         notify = 0;
 255         same_dev = 0; /* Keep the compiler quiet... */
 256         switch (state) {
 257         case DEV_STATE_NOT_OPER:
 258                 CIO_DEBUG(KERN_WARNING, 2,
 259                           "SenseID : unknown device %04x on subchannel "
 260                           "0.%x.%04x\n", cdev->private->devno,
 261                           sch->schid.ssid, sch->schid.sch_no);
 262                 break;
 263         case DEV_STATE_OFFLINE:
 264                 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 265                         same_dev = ccw_device_handle_oper(cdev);
 266                         notify = 1;
 267                 }
 268                 /* fill out sense information */
 269                 cdev->id = (struct ccw_device_id) {
 270                         .cu_type   = cdev->private->senseid.cu_type,
 271                         .cu_model  = cdev->private->senseid.cu_model,
 272                         .dev_type  = cdev->private->senseid.dev_type,
 273                         .dev_model = cdev->private->senseid.dev_model,
 274                 };
 275                 if (notify) {
 276                         cdev->private->state = DEV_STATE_OFFLINE;
 277                         if (same_dev) {
 278                                 /* Get device online again. */
 279                                 ccw_device_online(cdev);
 280                                 wake_up(&cdev->private->wait_q);
 281                         }
 282                         return;
 283                 }
 284                 /* Issue device info message. */
 285                 CIO_DEBUG(KERN_INFO, 2, "SenseID : device 0.%x.%04x reports: "
 286                           "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
 287                           "%04X/%02X\n",
 288                           cdev->private->ssid, cdev->private->devno,
 289                           cdev->id.cu_type, cdev->id.cu_model,
 290                           cdev->id.dev_type, cdev->id.dev_model);
 291                 break;
 292         case DEV_STATE_BOXED:
 293                 CIO_DEBUG(KERN_WARNING, 2,
 294                           "SenseID : boxed device %04x on subchannel "
 295                           "0.%x.%04x\n", cdev->private->devno,
 296                           sch->schid.ssid, sch->schid.sch_no);
 297                 break;
 298         }
 299         cdev->private->state = state;
 300         io_subchannel_recog_done(cdev);
 301         if (state != DEV_STATE_NOT_OPER)
 302                 wake_up(&cdev->private->wait_q);
 303 }
 304
 305 /*
 306  * Function called from device_id.c after sense id has completed.
 307  */
 308 void
 309 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
 310 {
 311         switch (err) {
 312         case 0:
 313                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
 314                 break;
 315         case -ETIME:            /* Sense id stopped by timeout. */
 316                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 317                 break;
 318         default:
 319                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 320                 break;
 321         }
 322 }
 323
 324 static void
 325 ccw_device_oper_notify(void *data)
 326 {
 327         struct ccw_device *cdev;
 328         struct subchannel *sch;
 329         int ret;
 330
 331         cdev = (struct ccw_device *)data;
 332         sch = to_subchannel(cdev->dev.parent);
 333         ret = (sch->driver && sch->driver->notify) ?
 334                 sch->driver->notify(&sch->dev, CIO_OPER) : 0;
 335         if (!ret)
 336                 /* Driver doesn't want device back. */
 337                 ccw_device_do_unreg_rereg((void *)cdev);
 338         else {
 339                 /* Reenable channel measurements, if needed. */
 340                 cmf_reenable(cdev);
 341                 wake_up(&cdev->private->wait_q);
 342         }
 343 }
 344
 345 /*
 346  * Finished with online/offline processing.
 347  */
 348 static void
 349 ccw_device_done(struct ccw_device *cdev, int state)
 350 {
 351         struct subchannel *sch;
 352
 353         sch = to_subchannel(cdev->dev.parent);
 354
 355         if (state != DEV_STATE_ONLINE)
 356                 cio_disable_subchannel(sch);
 357
 358         /* Reset device status. */
 359         memset(&cdev->private->irb, 0, sizeof(struct irb));
 360
 361         cdev->private->state = state;
 362
 363
 364         if (state == DEV_STATE_BOXED)
 365                 CIO_DEBUG(KERN_WARNING, 2,
 366                           "Boxed device %04x on subchannel %04x\n",
 367                           cdev->private->devno, sch->schid.sch_no);
 368
 369         if (cdev->private->flags.donotify) {
 370                 cdev->private->flags.donotify = 0;
 371                 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify,
 372                              (void *)cdev);
 373                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 374         }
 375         wake_up(&cdev->private->wait_q);
 376
 377         if (css_init_done && state != DEV_STATE_ONLINE)
 378                 put_device (&cdev->dev);
 379 }
 380
 381 /*
 382  * Function called from device_pgid.c after sense path ground has completed.
 383  */
 384 void
 385 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
 386 {
 387         struct subchannel *sch;
 388
 389         sch = to_subchannel(cdev->dev.parent);
 390         switch (err) {
 391         case 0:
 392                 /* Start Path Group verification. */
 393                 sch->vpm = 0;   /* Start with no path groups set. */
 394                 cdev->private->state = DEV_STATE_VERIFY;
 395                 ccw_device_verify_start(cdev);
 396                 break;
 397         case -ETIME:            /* Sense path group id stopped by timeout. */
 398         case -EUSERS:           /* device is reserved for someone else. */
 399                 ccw_device_done(cdev, DEV_STATE_BOXED);
 400                 break;
 401         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 402                 cdev->private->options.pgroup = 0;
 403                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 404                 break;
 405         default:
 406                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 407                 break;
 408         }
 409 }
 410
 411 /*
 412  * Start device recognition.
 413  */
 414 int
 415 ccw_device_recognition(struct ccw_device *cdev)
 416 {
 417         struct subchannel *sch;
 418         int ret;
 419
 420         if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
 421             (cdev->private->state != DEV_STATE_BOXED))
 422                 return -EINVAL;
 423         sch = to_subchannel(cdev->dev.parent);
 424         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 425         if (ret != 0)
 426                 /* Couldn't enable the subchannel for i/o. Sick device. */
 427                 return ret;
 428
 429         /* After 60s the device recognition is considered to have failed. */
 430         ccw_device_set_timeout(cdev, 60*HZ);
 431
 432         /*
 433          * We used to start here with a sense pgid to find out whether a device
 434          * is locked by someone else. Unfortunately, the sense pgid command
 435          * code has other meanings on devices predating the path grouping
 436          * algorithm, so we start with sense id and box the device after an
 437          * timeout (or if sense pgid during path verification detects the device
 438          * is locked, as may happen on newer devices).
 439          */
 440         cdev->private->flags.recog_done = 0;
 441         cdev->private->state = DEV_STATE_SENSE_ID;
 442         ccw_device_sense_id_start(cdev);
 443         return 0;
 444 }
 445
 446 /*
 447  * Handle timeout in device recognition.
 448  */
 449 static void
 450 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 451 {
 452         int ret;
 453
 454         ret = ccw_device_cancel_halt_clear(cdev);
 455         switch (ret) {
 456         case 0:
 457                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 458                 break;
 459         case -ENODEV:
 460                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 461                 break;
 462         default:
 463                 ccw_device_set_timeout(cdev, 3*HZ);
 464         }
 465 }
 466
 467
 468 static void
 469 ccw_device_nopath_notify(void *data)
 470 {
 471         struct ccw_device *cdev;
 472         struct subchannel *sch;
 473         int ret;
 474
 475         cdev = (struct ccw_device *)data;
 476         sch = to_subchannel(cdev->dev.parent);
 477         /* Extra sanity. */
 478         if (sch->lpm)
 479                 return;
 480         ret = (sch->driver && sch->driver->notify) ?
 481                 sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0;
 482         if (!ret) {
 483                 if (get_device(&sch->dev)) {
 484                         /* Driver doesn't want to keep device. */
 485                         cio_disable_subchannel(sch);
 486                         if (get_device(&cdev->dev)) {
 487                                 PREPARE_WORK(&cdev->private->kick_work,
 488                                              ccw_device_call_sch_unregister,
 489                                              (void *)cdev);
 490                                 queue_work(ccw_device_work,
 491                                            &cdev->private->kick_work);
 492                         } else
 493                                 put_device(&sch->dev);
 494                 }
 495         } else {
 496                 cio_disable_subchannel(sch);
 497                 ccw_device_set_timeout(cdev, 0);
 498                 cdev->private->flags.fake_irb = 0;
 499                 cdev->private->state = DEV_STATE_DISCONNECTED;
 500                 wake_up(&cdev->private->wait_q);
 501         }
 502 }
 503
 504 void
 505 ccw_device_verify_done(struct ccw_device *cdev, int err)
 506 {
 507         cdev->private->flags.doverify = 0;
 508         switch (err) {
 509         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 510                 cdev->private->options.pgroup = 0;
 511         case 0:
 512                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 513                 /* Deliver fake irb to device driver, if needed. */
 514                 if (cdev->private->flags.fake_irb) {
 515                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 516                         cdev->private->irb.scsw = (struct scsw) {
 517                                 .cc = 1,
 518                                 .fctl = SCSW_FCTL_START_FUNC,
 519                                 .actl = SCSW_ACTL_START_PEND,
 520                                 .stctl = SCSW_STCTL_STATUS_PEND,
 521                         };
 522                         cdev->private->flags.fake_irb = 0;
 523                         if (cdev->handler)
 524                                 cdev->handler(cdev, cdev->private->intparm,
 525                                               &cdev->private->irb);
 526                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 527                 }
 528                 break;
 529         case -ETIME:
 530                 ccw_device_done(cdev, DEV_STATE_BOXED);
 531                 break;
 532         default:
 533                 PREPARE_WORK(&cdev->private->kick_work,
 534                              ccw_device_nopath_notify, (void *)cdev);
 535                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 536                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 537                 break;
 538         }
 539 }
 540
 541 /*
 542  * Get device online.
 543  */
 544 int
 545 ccw_device_online(struct ccw_device *cdev)
 546 {
 547         struct subchannel *sch;
 548         int ret;
 549
 550         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 551             (cdev->private->state != DEV_STATE_BOXED))
 552                 return -EINVAL;
 553         sch = to_subchannel(cdev->dev.parent);
 554         if (css_init_done && !get_device(&cdev->dev))
 555                 return -ENODEV;
 556         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 557         if (ret != 0) {
 558                 /* Couldn't enable the subchannel for i/o. Sick device. */
 559                 if (ret == -ENODEV)
 560                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 561                 return ret;
 562         }
 563         /* Do we want to do path grouping? */
 564         if (!cdev->private->options.pgroup) {
 565                 /* No, set state online immediately. */
 566                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 567                 return 0;
 568         }
 569         /* Do a SensePGID first. */
 570         cdev->private->state = DEV_STATE_SENSE_PGID;
 571         ccw_device_sense_pgid_start(cdev);
 572         return 0;
 573 }
 574
 575 void
 576 ccw_device_disband_done(struct ccw_device *cdev, int err)
 577 {
 578         switch (err) {
 579         case 0:
 580                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 581                 break;
 582         case -ETIME:
 583                 ccw_device_done(cdev, DEV_STATE_BOXED);
 584                 break;
 585         default:
 586                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 587                 break;
 588         }
 589 }
 590
 591 /*
 592  * Shutdown device.
 593  */
 594 int
 595 ccw_device_offline(struct ccw_device *cdev)
 596 {
 597         struct subchannel *sch;
 598
 599         sch = to_subchannel(cdev->dev.parent);
 600         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
 601                 return -ENODEV;
 602         if (cdev->private->state != DEV_STATE_ONLINE) {
 603                 if (sch->schib.scsw.actl != 0)
 604                         return -EBUSY;
 605                 return -EINVAL;
 606         }
 607         if (sch->schib.scsw.actl != 0)
 608                 return -EBUSY;
 609         /* Are we doing path grouping? */
 610         if (!cdev->private->options.pgroup) {
 611                 /* No, set state offline immediately. */
 612                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 613                 return 0;
 614         }
 615         /* Start Set Path Group commands. */
 616         cdev->private->state = DEV_STATE_DISBAND_PGID;
 617         ccw_device_disband_start(cdev);
 618         return 0;
 619 }
 620
 621 /*
 622  * Handle timeout in device online/offline process.
 623  */
 624 static void
 625 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 626 {
 627         int ret;
 628
 629         ret = ccw_device_cancel_halt_clear(cdev);
 630         switch (ret) {
 631         case 0:
 632                 ccw_device_done(cdev, DEV_STATE_BOXED);
 633                 break;
 634         case -ENODEV:
 635                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 636                 break;
 637         default:
 638                 ccw_device_set_timeout(cdev, 3*HZ);
 639         }
 640 }
 641
 642 /*
 643  * Handle not oper event in device recognition.
 644  */
 645 static void
 646 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 647 {
 648         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 649 }
 650
 651 /*
 652  * Handle not operational event while offline.
 653  */
 654 static void
 655 ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 656 {
 657         struct subchannel *sch;
 658
 659         cdev->private->state = DEV_STATE_NOT_OPER;
 660         sch = to_subchannel(cdev->dev.parent);
 661         if (get_device(&cdev->dev)) {
 662                 PREPARE_WORK(&cdev->private->kick_work,
 663                              ccw_device_call_sch_unregister, (void *)cdev);
 664                 queue_work(ccw_device_work, &cdev->private->kick_work);
 665         }
 666         wake_up(&cdev->private->wait_q);
 667 }
 668
 669 /*
 670  * Handle not operational event while online.
 671  */
 672 static void
 673 ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 674 {
 675         struct subchannel *sch;
 676
 677         sch = to_subchannel(cdev->dev.parent);
 678         if (sch->driver->notify &&
 679             sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) {
 680                         ccw_device_set_timeout(cdev, 0);
 681                         cdev->private->flags.fake_irb = 0;
 682                         cdev->private->state = DEV_STATE_DISCONNECTED;
 683                         wake_up(&cdev->private->wait_q);
 684                         return;
 685         }
 686         cdev->private->state = DEV_STATE_NOT_OPER;
 687         cio_disable_subchannel(sch);
 688         if (sch->schib.scsw.actl != 0) {
 689                 // FIXME: not-oper indication to device driver ?
 690                 ccw_device_call_handler(cdev);
 691         }
 692         if (get_device(&cdev->dev)) {
 693                 PREPARE_WORK(&cdev->private->kick_work,
 694                              ccw_device_call_sch_unregister, (void *)cdev);
 695                 queue_work(ccw_device_work, &cdev->private->kick_work);
 696         }
 697         wake_up(&cdev->private->wait_q);
 698 }
 699
 700 /*
 701  * Handle path verification event.
 702  */
 703 static void
 704 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 705 {
 706         struct subchannel *sch;
 707
 708         if (!cdev->private->options.pgroup)
 709                 return;
 710         if (cdev->private->state == DEV_STATE_W4SENSE) {
 711                 cdev->private->flags.doverify = 1;
 712                 return;
 713         }
 714         sch = to_subchannel(cdev->dev.parent);
 715         /*
 716          * Since we might not just be coming from an interrupt from the
 717          * subchannel we have to update the schib.
 718          */
 719         stsch(sch->schid, &sch->schib);
 720
 721         if (sch->schib.scsw.actl != 0 ||
 722             (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
 723                 /*
 724                  * No final status yet or final status not yet delivered
 725                  * to the device driver. Can't do path verfication now,
 726                  * delay until final status was delivered.
 727                  */
 728                 cdev->private->flags.doverify = 1;
 729                 return;
 730         }
 731         /* Device is idle, we can do the path verification. */
 732         cdev->private->state = DEV_STATE_VERIFY;
 733         ccw_device_verify_start(cdev);
 734 }
 735
 736 /*
 737  * Got an interrupt for a normal io (state online).
 738  */
 739 static void
 740 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 741 {
 742         struct irb *irb;
 743
 744         irb = (struct irb *) __LC_IRB;
 745         /* Check for unsolicited interrupt. */
 746         if ((irb->scsw.stctl ==
 747                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
 748             && (!irb->scsw.cc)) {
 749                 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 750                     !irb->esw.esw0.erw.cons) {
 751                         /* Unit check but no sense data. Need basic sense. */
 752                         if (ccw_device_do_sense(cdev, irb) != 0)
 753                                 goto call_handler_unsol;
 754                         memcpy(&cdev->private->irb, irb, sizeof(struct irb));
 755                         cdev->private->state = DEV_STATE_W4SENSE;
 756                         cdev->private->intparm = 0;
 757                         return;
 758                 }
 759 call_handler_unsol:
 760                 if (cdev->handler)
 761                         cdev->handler (cdev, 0, irb);
 762                 return;
 763         }
 764         /* Accumulate status and find out if a basic sense is needed. */
 765         ccw_device_accumulate_irb(cdev, irb);
 766         if (cdev->private->flags.dosense) {
 767                 if (ccw_device_do_sense(cdev, irb) == 0) {
 768                         cdev->private->state = DEV_STATE_W4SENSE;
 769                 }
 770                 return;
 771         }
 772         /* Call the handler. */
 773         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 774                 /* Start delayed path verification. */
 775                 ccw_device_online_verify(cdev, 0);
 776 }
 777
 778 /*
 779  * Got an timeout in online state.
 780  */
 781 static void
 782 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 783 {
 784         int ret;
 785
 786         ccw_device_set_timeout(cdev, 0);
 787         ret = ccw_device_cancel_halt_clear(cdev);
 788         if (ret == -EBUSY) {
 789                 ccw_device_set_timeout(cdev, 3*HZ);
 790                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 791                 return;
 792         }
 793         if (ret == -ENODEV) {
 794                 struct subchannel *sch;
 795
 796                 sch = to_subchannel(cdev->dev.parent);
 797                 if (!sch->lpm) {
 798                         PREPARE_WORK(&cdev->private->kick_work,
 799                                      ccw_device_nopath_notify, (void *)cdev);
 800                         queue_work(ccw_device_notify_work,
 801                                    &cdev->private->kick_work);
 802                 } else
 803                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 804         } else if (cdev->handler)
 805                 cdev->handler(cdev, cdev->private->intparm,
 806                               ERR_PTR(-ETIMEDOUT));
 807 }
 808
 809 /*
 810  * Got an interrupt for a basic sense.
 811  */
 812 void
 813 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 814 {
 815         struct irb *irb;
 816
 817         irb = (struct irb *) __LC_IRB;
 818         /* Check for unsolicited interrupt. */
 819         if (irb->scsw.stctl ==
 820                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 821                 if (irb->scsw.cc == 1)
 822                         /* Basic sense hasn't started. Try again. */
 823                         ccw_device_do_sense(cdev, irb);
 824                 else {
 825                         printk("Huh? %s(%s): unsolicited interrupt...\n",
 826                                __FUNCTION__, cdev->dev.bus_id);
 827                         if (cdev->handler)
 828                                 cdev->handler (cdev, 0, irb);
 829                 }
 830                 return;
 831         }
 832         /*
 833          * Check if a halt or clear has been issued in the meanwhile. If yes,
 834          * only deliver the halt/clear interrupt to the device driver as if it
 835          * had killed the original request.
 836          */
 837         if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
 838                 cdev->private->flags.dosense = 0;
 839                 memset(&cdev->private->irb, 0, sizeof(struct irb));
 840                 ccw_device_accumulate_irb(cdev, irb);
 841                 goto call_handler;
 842         }
 843         /* Add basic sense info to irb. */
 844         ccw_device_accumulate_basic_sense(cdev, irb);
 845         if (cdev->private->flags.dosense) {
 846                 /* Another basic sense is needed. */
 847                 ccw_device_do_sense(cdev, irb);
 848                 return;
 849         }
 850 call_handler:
 851         cdev->private->state = DEV_STATE_ONLINE;
 852         /* Call the handler. */
 853         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 854                 /* Start delayed path verification. */
 855                 ccw_device_online_verify(cdev, 0);
 856 }
 857
 858 static void
 859 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 860 {
 861         struct irb *irb;
 862
 863         irb = (struct irb *) __LC_IRB;
 864         /* Accumulate status. We don't do basic sense. */
 865         ccw_device_accumulate_irb(cdev, irb);
 866         /* Remember to clear irb to avoid residuals. */
 867         memset(&cdev->private->irb, 0, sizeof(struct irb));
 868         /* Try to start delayed device verification. */
 869         ccw_device_online_verify(cdev, 0);
 870         /* Note: Don't call handler for cio initiated clear! */
 871 }
 872
 873 static void
 874 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
 875 {
 876         struct subchannel *sch;
 877
 878         sch = to_subchannel(cdev->dev.parent);
 879         ccw_device_set_timeout(cdev, 0);
 880         /* OK, i/o is dead now. Call interrupt handler. */
 881         cdev->private->state = DEV_STATE_ONLINE;
 882         if (cdev->handler)
 883                 cdev->handler(cdev, cdev->private->intparm,
 884                               ERR_PTR(-ETIMEDOUT));
 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, &cdev->private->kick_work);
 889         } else if (cdev->private->flags.doverify)
 890                 /* Start delayed path verification. */
 891                 ccw_device_online_verify(cdev, 0);
 892 }
 893
 894 static void
 895 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 896 {
 897         int ret;
 898
 899         ret = ccw_device_cancel_halt_clear(cdev);
 900         if (ret == -EBUSY) {
 901                 ccw_device_set_timeout(cdev, 3*HZ);
 902                 return;
 903         }
 904         if (ret == -ENODEV) {
 905                 struct subchannel *sch;
 906
 907                 sch = to_subchannel(cdev->dev.parent);
 908                 if (!sch->lpm) {
 909                         PREPARE_WORK(&cdev->private->kick_work,
 910                                      ccw_device_nopath_notify, (void *)cdev);
 911                         queue_work(ccw_device_notify_work,
 912                                    &cdev->private->kick_work);
 913                 } else
 914                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 915                 return;
 916         }
 917         //FIXME: Can we get here?
 918         cdev->private->state = DEV_STATE_ONLINE;
 919         if (cdev->handler)
 920                 cdev->handler(cdev, cdev->private->intparm,
 921                               ERR_PTR(-ETIMEDOUT));
 922 }
 923
 924 static void
 925 ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event)
 926 {
 927         struct irb *irb;
 928         struct subchannel *sch;
 929
 930         irb = (struct irb *) __LC_IRB;
 931         /*
 932          * Accumulate status and find out if a basic sense is needed.
 933          * This is fine since we have already adapted the lpm.
 934          */
 935         ccw_device_accumulate_irb(cdev, irb);
 936         if (cdev->private->flags.dosense) {
 937                 if (ccw_device_do_sense(cdev, irb) == 0) {
 938                         cdev->private->state = DEV_STATE_W4SENSE;
 939                 }
 940                 return;
 941         }
 942
 943         /* Iff device is idle, reset timeout. */
 944         sch = to_subchannel(cdev->dev.parent);
 945         if (!stsch(sch->schid, &sch->schib))
 946                 if (sch->schib.scsw.actl == 0)
 947                         ccw_device_set_timeout(cdev, 0);
 948         /* Call the handler. */
 949         ccw_device_call_handler(cdev);
 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, &cdev->private->kick_work);
 954         } else if (cdev->private->flags.doverify)
 955                 ccw_device_online_verify(cdev, 0);
 956 }
 957
 958 static void
 959 ccw_device_wait4io_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 960 {
 961         int ret;
 962         struct subchannel *sch;
 963
 964         sch = to_subchannel(cdev->dev.parent);
 965         ccw_device_set_timeout(cdev, 0);
 966         ret = ccw_device_cancel_halt_clear(cdev);
 967         if (ret == -EBUSY) {
 968                 ccw_device_set_timeout(cdev, 3*HZ);
 969                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 970                 return;
 971         }
 972         if (ret == -ENODEV) {
 973                 if (!sch->lpm) {
 974                         PREPARE_WORK(&cdev->private->kick_work,
 975                                      ccw_device_nopath_notify, (void *)cdev);
 976                         queue_work(ccw_device_notify_work,
 977                                    &cdev->private->kick_work);
 978                 } else
 979                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 980                 return;
 981         }
 982         if (cdev->handler)
 983                 cdev->handler(cdev, cdev->private->intparm,
 984                               ERR_PTR(-ETIMEDOUT));
 985         if (!sch->lpm) {
 986                 PREPARE_WORK(&cdev->private->kick_work,
 987                              ccw_device_nopath_notify, (void *)cdev);
 988                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 989         } else if (cdev->private->flags.doverify)
 990                 /* Start delayed path verification. */
 991                 ccw_device_online_verify(cdev, 0);
 992 }
 993
 994 static void
 995 ccw_device_wait4io_verify(struct ccw_device *cdev, enum dev_event dev_event)
 996 {
 997         /* When the I/O has terminated, we have to start verification. */
 998         if (cdev->private->options.pgroup)
 999                 cdev->private->flags.doverify = 1;
1000 }
1001
1002 static void
1003 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1004 {
1005         struct irb *irb;
1006
1007         switch (dev_event) {
1008         case DEV_EVENT_INTERRUPT:
1009                 irb = (struct irb *) __LC_IRB;
1010                 /* Check for unsolicited interrupt. */
1011                 if ((irb->scsw.stctl ==
1012                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1013                     (!irb->scsw.cc))
1014                         /* FIXME: we should restart stlck here, but this
1015                          * is extremely unlikely ... */
1016                         goto out_wakeup;
1017
1018                 ccw_device_accumulate_irb(cdev, irb);
1019                 /* We don't care about basic sense etc. */
1020                 break;
1021         default: /* timeout */
1022                 break;
1023         }
1024 out_wakeup:
1025         wake_up(&cdev->private->wait_q);
1026 }
1027
1028 static void
1029 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1030 {
1031         struct subchannel *sch;
1032
1033         sch = to_subchannel(cdev->dev.parent);
1034         if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1035                 /* Couldn't enable the subchannel for i/o. Sick device. */
1036                 return;
1037
1038         /* After 60s the device recognition is considered to have failed. */
1039         ccw_device_set_timeout(cdev, 60*HZ);
1040
1041         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1042         ccw_device_sense_id_start(cdev);
1043 }
1044
1045 void
1046 device_trigger_reprobe(struct subchannel *sch)
1047 {
1048         struct ccw_device *cdev;
1049
1050         if (!sch->dev.driver_data)
1051                 return;
1052         cdev = sch->dev.driver_data;
1053         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1054                 return;
1055
1056         /* Update some values. */
1057         if (stsch(sch->schid, &sch->schib))
1058                 return;
1059
1060         /*
1061          * The pim, pam, pom values may not be accurate, but they are the best
1062          * we have before performing device selection :/
1063          */
1064         sch->lpm = sch->schib.pmcw.pim &
1065                 sch->schib.pmcw.pam &
1066                 sch->schib.pmcw.pom &
1067                 sch->opm;
1068         /* Re-set some bits in the pmcw that were lost. */
1069         sch->schib.pmcw.isc = 3;
1070         sch->schib.pmcw.csense = 1;
1071         sch->schib.pmcw.ena = 0;
1072         if ((sch->lpm & (sch->lpm - 1)) != 0)
1073                 sch->schib.pmcw.mp = 1;
1074         sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1075         /* We should also udate ssd info, but this has to wait. */
1076         ccw_device_start_id(cdev, 0);
1077 }
1078
1079 static void
1080 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1081 {
1082         struct subchannel *sch;
1083
1084         sch = to_subchannel(cdev->dev.parent);
1085         /*
1086          * An interrupt in state offline means a previous disable was not
1087          * successful. Try again.
1088          */
1089         cio_disable_subchannel(sch);
1090 }
1091
1092 static void
1093 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1094 {
1095         retry_set_schib(cdev);
1096         cdev->private->state = DEV_STATE_ONLINE;
1097         dev_fsm_event(cdev, dev_event);
1098 }
1099
1100 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1101                                        enum dev_event dev_event)
1102 {
1103         cmf_retry_copy_block(cdev);
1104         cdev->private->state = DEV_STATE_ONLINE;
1105         dev_fsm_event(cdev, dev_event);
1106 }
1107
1108 static void
1109 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1110 {
1111         ccw_device_set_timeout(cdev, 0);
1112         if (dev_event == DEV_EVENT_NOTOPER)
1113                 cdev->private->state = DEV_STATE_NOT_OPER;
1114         else
1115                 cdev->private->state = DEV_STATE_OFFLINE;
1116         wake_up(&cdev->private->wait_q);
1117 }
1118
1119 static void
1120 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1121 {
1122         int ret;
1123
1124         ret = ccw_device_cancel_halt_clear(cdev);
1125         switch (ret) {
1126         case 0:
1127                 cdev->private->state = DEV_STATE_OFFLINE;
1128                 wake_up(&cdev->private->wait_q);
1129                 break;
1130         case -ENODEV:
1131                 cdev->private->state = DEV_STATE_NOT_OPER;
1132                 wake_up(&cdev->private->wait_q);
1133                 break;
1134         default:
1135                 ccw_device_set_timeout(cdev, HZ/10);
1136         }
1137 }
1138
1139 /*
1140  * No operation action. This is used e.g. to ignore a timeout event in
1141  * state offline.
1142  */
1143 static void
1144 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1145 {
1146 }
1147
1148 /*
1149  * Bug operation action.
1150  */
1151 static void
1152 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1153 {
1154         printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
1155                cdev->private->state, dev_event);
1156         BUG();
1157 }
1158
1159 /*
1160  * device statemachine
1161  */
1162 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1163         [DEV_STATE_NOT_OPER] = {
1164                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1165                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1166                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1167                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1168         },
1169         [DEV_STATE_SENSE_PGID] = {
1170                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1171                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1172                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1173                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1174         },
1175         [DEV_STATE_SENSE_ID] = {
1176                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1177                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1178                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1179                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1180         },
1181         [DEV_STATE_OFFLINE] = {
1182                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1183                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1184                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1185                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1186         },
1187         [DEV_STATE_VERIFY] = {
1188                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1189                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1190                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1191                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1192         },
1193         [DEV_STATE_ONLINE] = {
1194                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1195                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1196                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1197                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1198         },
1199         [DEV_STATE_W4SENSE] = {
1200                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1201                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1202                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1203                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1204         },
1205         [DEV_STATE_DISBAND_PGID] = {
1206                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1207                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1208                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1209                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1210         },
1211         [DEV_STATE_BOXED] = {
1212                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1213                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1214                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1215                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1216         },
1217         /* states to wait for i/o completion before doing something */
1218         [DEV_STATE_CLEAR_VERIFY] = {
1219                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1220                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1221                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1222                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1223         },
1224         [DEV_STATE_TIMEOUT_KILL] = {
1225                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1226                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1227                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1228                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1229         },
1230         [DEV_STATE_WAIT4IO] = {
1231                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1232                 [DEV_EVENT_INTERRUPT]   = ccw_device_wait4io_irq,
1233                 [DEV_EVENT_TIMEOUT]     = ccw_device_wait4io_timeout,
1234                 [DEV_EVENT_VERIFY]      = ccw_device_wait4io_verify,
1235         },
1236         [DEV_STATE_QUIESCE] = {
1237                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1238                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1239                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1240                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1241         },
1242         /* special states for devices gone not operational */
1243         [DEV_STATE_DISCONNECTED] = {
1244                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1245                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1246                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1247                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1248         },
1249         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1250                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1251                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1252                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1253                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1254         },
1255         [DEV_STATE_CMFCHANGE] = {
1256                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1257                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1258                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1259                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1260         },
1261         [DEV_STATE_CMFUPDATE] = {
1262                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1263                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1264                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1265                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1266         },
1267 };
1268
1269 /*
1270  * io_subchannel_irq is called for "real" interrupts or for status
1271  * pending conditions on msch.
1272  */
1273 void
1274 io_subchannel_irq (struct device *pdev)
1275 {
1276         struct ccw_device *cdev;
1277
1278         cdev = to_subchannel(pdev)->dev.driver_data;
1279
1280         CIO_TRACE_EVENT (3, "IRQ");
1281         CIO_TRACE_EVENT (3, pdev->bus_id);
1282         if (cdev)
1283                 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1284 }
1285
1286 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);