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

   1 /*
   2  * drivers/s390/cio/device_fsm.c
   3  * finite state machine for device handling
   4  *
   5  *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
   6  *                       IBM Corporation
   7  *    Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
   8  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/config.h>
  13 #include <linux/init.h>
  14 #include <linux/jiffies.h>
  15 #include <linux/string.h>
  16
  17 #include <asm/ccwdev.h>
  18 #include <asm/cio.h>
  19
  20 #include "cio.h"
  21 #include "cio_debug.h"
  22 #include "css.h"
  23 #include "device.h"
  24 #include "chsc.h"
  25 #include "ioasm.h"
  26
  27 int
  28 device_is_online(struct subchannel *sch)
  29 {
  30         struct ccw_device *cdev;
  31
  32         if (!sch->dev.driver_data)
  33                 return 0;
  34         cdev = sch->dev.driver_data;
  35         return (cdev->private->state == DEV_STATE_ONLINE);
  36 }
  37
  38 int
  39 device_is_disconnected(struct subchannel *sch)
  40 {
  41         struct ccw_device *cdev;
  42
  43         if (!sch->dev.driver_data)
  44                 return 0;
  45         cdev = sch->dev.driver_data;
  46         return (cdev->private->state == DEV_STATE_DISCONNECTED ||
  47                 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
  48 }
  49
  50 void
  51 device_set_disconnected(struct subchannel *sch)
  52 {
  53         struct ccw_device *cdev;
  54
  55         if (!sch->dev.driver_data)
  56                 return;
  57         cdev = sch->dev.driver_data;
  58         ccw_device_set_timeout(cdev, 0);
  59         cdev->private->flags.fake_irb = 0;
  60         cdev->private->state = DEV_STATE_DISCONNECTED;
  61 }
  62
  63 void
  64 device_set_waiting(struct subchannel *sch)
  65 {
  66         struct ccw_device *cdev;
  67
  68         if (!sch->dev.driver_data)
  69                 return;
  70         cdev = sch->dev.driver_data;
  71         ccw_device_set_timeout(cdev, 10*HZ);
  72         cdev->private->state = DEV_STATE_WAIT4IO;
  73 }
  74
  75 /*
  76  * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
  77  */
  78 static void
  79 ccw_device_timeout(unsigned long data)
  80 {
  81         struct ccw_device *cdev;
  82
  83         cdev = (struct ccw_device *) data;
  84         spin_lock_irq(cdev->ccwlock);
  85         dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
  86         spin_unlock_irq(cdev->ccwlock);
  87 }
  88
  89 /*
  90  * Set timeout
  91  */
  92 void
  93 ccw_device_set_timeout(struct ccw_device *cdev, int expires)
  94 {
  95         if (expires == 0) {
  96                 del_timer(&cdev->private->timer);
  97                 return;
  98         }
  99         if (timer_pending(&cdev->private->timer)) {
 100                 if (mod_timer(&cdev->private->timer, jiffies + expires))
 101                         return;
 102         }
 103         cdev->private->timer.function = ccw_device_timeout;
 104         cdev->private->timer.data = (unsigned long) cdev;
 105         cdev->private->timer.expires = jiffies + expires;
 106         add_timer(&cdev->private->timer);
 107 }
 108
 109 /* Kill any pending timers after machine check. */
 110 void
 111 device_kill_pending_timer(struct subchannel *sch)
 112 {
 113         struct ccw_device *cdev;
 114
 115         if (!sch->dev.driver_data)
 116                 return;
 117         cdev = sch->dev.driver_data;
 118         ccw_device_set_timeout(cdev, 0);
 119 }
 120
 121 /*
 122  * Cancel running i/o. This is called repeatedly since halt/clear are
 123  * asynchronous operations. We do one try with cio_cancel, two tries
 124  * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
 125  * Returns 0 if device now idle, -ENODEV for device not operational and
 126  * -EBUSY if an interrupt is expected (either from halt/clear or from a
 127  * status pending).
 128  */
 129 int
 130 ccw_device_cancel_halt_clear(struct ccw_device *cdev)
 131 {
 132         struct subchannel *sch;
 133         int ret;
 134
 135         sch = to_subchannel(cdev->dev.parent);
 136         ret = stsch(sch->schid, &sch->schib);
 137         if (ret || !sch->schib.pmcw.dnv)
 138                 return -ENODEV;
 139         if (!sch->schib.pmcw.ena || sch->schib.scsw.actl == 0)
 140                 /* Not operational or no activity -> done. */
 141                 return 0;
 142         /* Stage 1: cancel io. */
 143         if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) &&
 144             !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
 145                 ret = cio_cancel(sch);
 146                 if (ret != -EINVAL)
 147                         return ret;
 148                 /* cancel io unsuccessful. From now on it is asynchronous. */
 149                 cdev->private->iretry = 3;      /* 3 halt retries. */
 150         }
 151         if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
 152                 /* Stage 2: halt io. */
 153                 if (cdev->private->iretry) {
 154                         cdev->private->iretry--;
 155                         ret = cio_halt(sch);
 156                         return (ret == 0) ? -EBUSY : ret;
 157                 }
 158                 /* halt io unsuccessful. */
 159                 cdev->private->iretry = 255;    /* 255 clear retries. */
 160         }
 161         /* Stage 3: clear io. */
 162         if (cdev->private->iretry) {
 163                 cdev->private->iretry--;
 164                 ret = cio_clear (sch);
 165                 return (ret == 0) ? -EBUSY : ret;
 166         }
 167         panic("Can't stop i/o on subchannel.\n");
 168 }
 169
 170 static int
 171 ccw_device_handle_oper(struct ccw_device *cdev)
 172 {
 173         struct subchannel *sch;
 174
 175         sch = to_subchannel(cdev->dev.parent);
 176         cdev->private->flags.recog_done = 1;
 177         /*
 178          * Check if cu type and device type still match. If
 179          * not, it is certainly another device and we have to
 180          * de- and re-register. Also check here for non-matching devno.
 181          */
 182         if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
 183             cdev->id.cu_model != cdev->private->senseid.cu_model ||
 184             cdev->id.dev_type != cdev->private->senseid.dev_type ||
 185             cdev->id.dev_model != cdev->private->senseid.dev_model ||
 186             cdev->private->devno != sch->schib.pmcw.dev) {
 187                 PREPARE_WORK(&cdev->private->kick_work,
 188                              ccw_device_do_unreg_rereg, (void *)cdev);
 189                 queue_work(ccw_device_work, &cdev->private->kick_work);
 190                 return 0;
 191         }
 192         cdev->private->flags.donotify = 1;
 193         return 1;
 194 }
 195
 196 /*
 197  * The machine won't give us any notification by machine check if a chpid has
 198  * been varied online on the SE so we have to find out by magic (i. e. driving
 199  * the channel subsystem to device selection and updating our path masks).
 200  */
 201 static inline void
 202 __recover_lost_chpids(struct subchannel *sch, int old_lpm)
 203 {
 204         int mask, i;
 205
 206         for (i = 0; i<8; i++) {
 207                 mask = 0x80 >> i;
 208                 if (!(sch->lpm & mask))
 209                         continue;
 210                 if (old_lpm & mask)
 211                         continue;
 212                 chpid_is_actually_online(sch->schib.pmcw.chpid[i]);
 213         }
 214 }
 215
 216 /*
 217  * Stop device recognition.
 218  */
 219 static void
 220 ccw_device_recog_done(struct ccw_device *cdev, int state)
 221 {
 222         struct subchannel *sch;
 223         int notify, old_lpm, same_dev;
 224
 225         sch = to_subchannel(cdev->dev.parent);
 226
 227         ccw_device_set_timeout(cdev, 0);
 228         cio_disable_subchannel(sch);
 229         /*
 230          * Now that we tried recognition, we have performed device selection
 231          * through ssch() and the path information is up to date.
 232          */
 233         old_lpm = sch->lpm;
 234         stsch(sch->schid, &sch->schib);
 235         sch->lpm = sch->schib.pmcw.pim &
 236                 sch->schib.pmcw.pam &
 237                 sch->schib.pmcw.pom &
 238                 sch->opm;
 239         /* Check since device may again have become not operational. */
 240         if (!sch->schib.pmcw.dnv)
 241                 state = DEV_STATE_NOT_OPER;
 242         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
 243                 /* Force reprobe on all chpids. */
 244                 old_lpm = 0;
 245         if (sch->lpm != old_lpm)
 246                 __recover_lost_chpids(sch, old_lpm);
 247         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 248                 if (state == DEV_STATE_NOT_OPER) {
 249                         cdev->private->flags.recog_done = 1;
 250                         cdev->private->state = DEV_STATE_DISCONNECTED;
 251                         return;
 252                 }
 253                 /* Boxed devices don't need extra treatment. */
 254         }
 255         notify = 0;
 256         same_dev = 0; /* Keep the compiler quiet... */
 257         switch (state) {
 258         case DEV_STATE_NOT_OPER:
 259                 CIO_DEBUG(KERN_WARNING, 2,
 260                           "SenseID : unknown device %04x on subchannel "
 261                           "0.%x.%04x\n", cdev->private->devno,
 262                           sch->schid.ssid, sch->schid.sch_no);
 263                 break;
 264         case DEV_STATE_OFFLINE:
 265                 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 266                         same_dev = ccw_device_handle_oper(cdev);
 267                         notify = 1;
 268                 }
 269                 /* fill out sense information */
 270                 cdev->id = (struct ccw_device_id) {
 271                         .cu_type   = cdev->private->senseid.cu_type,
 272                         .cu_model  = cdev->private->senseid.cu_model,
 273                         .dev_type  = cdev->private->senseid.dev_type,
 274                         .dev_model = cdev->private->senseid.dev_model,
 275                 };
 276                 if (notify) {
 277                         cdev->private->state = DEV_STATE_OFFLINE;
 278                         if (same_dev) {
 279                                 /* Get device online again. */
 280                                 ccw_device_online(cdev);
 281                                 wake_up(&cdev->private->wait_q);
 282                         }
 283                         return;
 284                 }
 285                 /* Issue device info message. */
 286                 CIO_DEBUG(KERN_INFO, 2, "SenseID : device 0.%x.%04x reports: "
 287                           "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
 288                           "%04X/%02X\n",
 289                           cdev->private->ssid, cdev->private->devno,
 290                           cdev->id.cu_type, cdev->id.cu_model,
 291                           cdev->id.dev_type, cdev->id.dev_model);
 292                 break;
 293         case DEV_STATE_BOXED:
 294                 CIO_DEBUG(KERN_WARNING, 2,
 295                           "SenseID : boxed device %04x on subchannel "
 296                           "0.%x.%04x\n", cdev->private->devno,
 297                           sch->schid.ssid, sch->schid.sch_no);
 298                 break;
 299         }
 300         cdev->private->state = state;
 301         io_subchannel_recog_done(cdev);
 302         if (state != DEV_STATE_NOT_OPER)
 303                 wake_up(&cdev->private->wait_q);
 304 }
 305
 306 /*
 307  * Function called from device_id.c after sense id has completed.
 308  */
 309 void
 310 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
 311 {
 312         switch (err) {
 313         case 0:
 314                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
 315                 break;
 316         case -ETIME:            /* Sense id stopped by timeout. */
 317                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 318                 break;
 319         default:
 320                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 321                 break;
 322         }
 323 }
 324
 325 static void
 326 ccw_device_oper_notify(void *data)
 327 {
 328         struct ccw_device *cdev;
 329         struct subchannel *sch;
 330         int ret;
 331
 332         cdev = (struct ccw_device *)data;
 333         sch = to_subchannel(cdev->dev.parent);
 334         ret = (sch->driver && sch->driver->notify) ?
 335                 sch->driver->notify(&sch->dev, CIO_OPER) : 0;
 336         if (!ret)
 337                 /* Driver doesn't want device back. */
 338                 ccw_device_do_unreg_rereg((void *)cdev);
 339         else
 340                 wake_up(&cdev->private->wait_q);
 341 }
 342
 343 /*
 344  * Finished with online/offline processing.
 345  */
 346 static void
 347 ccw_device_done(struct ccw_device *cdev, int state)
 348 {
 349         struct subchannel *sch;
 350
 351         sch = to_subchannel(cdev->dev.parent);
 352
 353         if (state != DEV_STATE_ONLINE)
 354                 cio_disable_subchannel(sch);
 355
 356         /* Reset device status. */
 357         memset(&cdev->private->irb, 0, sizeof(struct irb));
 358
 359         cdev->private->state = state;
 360
 361
 362         if (state == DEV_STATE_BOXED)
 363                 CIO_DEBUG(KERN_WARNING, 2,
 364                           "Boxed device %04x on subchannel %04x\n",
 365                           cdev->private->devno, sch->schid.sch_no);
 366
 367         if (cdev->private->flags.donotify) {
 368                 cdev->private->flags.donotify = 0;
 369                 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify,
 370                              (void *)cdev);
 371                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 372         }
 373         wake_up(&cdev->private->wait_q);
 374
 375         if (css_init_done && state != DEV_STATE_ONLINE)
 376                 put_device (&cdev->dev);
 377 }
 378
 379 /*
 380  * Function called from device_pgid.c after sense path ground has completed.
 381  */
 382 void
 383 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
 384 {
 385         struct subchannel *sch;
 386
 387         sch = to_subchannel(cdev->dev.parent);
 388         switch (err) {
 389         case 0:
 390                 /* Start Path Group verification. */
 391                 sch->vpm = 0;   /* Start with no path groups set. */
 392                 cdev->private->state = DEV_STATE_VERIFY;
 393                 ccw_device_verify_start(cdev);
 394                 break;
 395         case -ETIME:            /* Sense path group id stopped by timeout. */
 396         case -EUSERS:           /* device is reserved for someone else. */
 397                 ccw_device_done(cdev, DEV_STATE_BOXED);
 398                 break;
 399         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 400                 cdev->private->options.pgroup = 0;
 401                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 402                 break;
 403         default:
 404                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 405                 break;
 406         }
 407 }
 408
 409 /*
 410  * Start device recognition.
 411  */
 412 int
 413 ccw_device_recognition(struct ccw_device *cdev)
 414 {
 415         struct subchannel *sch;
 416         int ret;
 417
 418         if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
 419             (cdev->private->state != DEV_STATE_BOXED))
 420                 return -EINVAL;
 421         sch = to_subchannel(cdev->dev.parent);
 422         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 423         if (ret != 0)
 424                 /* Couldn't enable the subchannel for i/o. Sick device. */
 425                 return ret;
 426
 427         /* After 60s the device recognition is considered to have failed. */
 428         ccw_device_set_timeout(cdev, 60*HZ);
 429
 430         /*
 431          * We used to start here with a sense pgid to find out whether a device
 432          * is locked by someone else. Unfortunately, the sense pgid command
 433          * code has other meanings on devices predating the path grouping
 434          * algorithm, so we start with sense id and box the device after an
 435          * timeout (or if sense pgid during path verification detects the device
 436          * is locked, as may happen on newer devices).
 437          */
 438         cdev->private->flags.recog_done = 0;
 439         cdev->private->state = DEV_STATE_SENSE_ID;
 440         ccw_device_sense_id_start(cdev);
 441         return 0;
 442 }
 443
 444 /*
 445  * Handle timeout in device recognition.
 446  */
 447 static void
 448 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 449 {
 450         int ret;
 451
 452         ret = ccw_device_cancel_halt_clear(cdev);
 453         switch (ret) {
 454         case 0:
 455                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 456                 break;
 457         case -ENODEV:
 458                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 459                 break;
 460         default:
 461                 ccw_device_set_timeout(cdev, 3*HZ);
 462         }
 463 }
 464
 465
 466 static void
 467 ccw_device_nopath_notify(void *data)
 468 {
 469         struct ccw_device *cdev;
 470         struct subchannel *sch;
 471         int ret;
 472
 473         cdev = (struct ccw_device *)data;
 474         sch = to_subchannel(cdev->dev.parent);
 475         /* Extra sanity. */
 476         if (sch->lpm)
 477                 return;
 478         ret = (sch->driver && sch->driver->notify) ?
 479                 sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0;
 480         if (!ret) {
 481                 if (get_device(&sch->dev)) {
 482                         /* Driver doesn't want to keep device. */
 483                         cio_disable_subchannel(sch);
 484                         if (get_device(&cdev->dev)) {
 485                                 PREPARE_WORK(&cdev->private->kick_work,
 486                                              ccw_device_call_sch_unregister,
 487                                              (void *)cdev);
 488                                 queue_work(ccw_device_work,
 489                                            &cdev->private->kick_work);
 490                         } else
 491                                 put_device(&sch->dev);
 492                 }
 493         } else {
 494                 cio_disable_subchannel(sch);
 495                 ccw_device_set_timeout(cdev, 0);
 496                 cdev->private->flags.fake_irb = 0;
 497                 cdev->private->state = DEV_STATE_DISCONNECTED;
 498                 wake_up(&cdev->private->wait_q);
 499         }
 500 }
 501
 502 void
 503 ccw_device_verify_done(struct ccw_device *cdev, int err)
 504 {
 505         cdev->private->flags.doverify = 0;
 506         switch (err) {
 507         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 508                 cdev->private->options.pgroup = 0;
 509         case 0:
 510                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 511                 /* Deliver fake irb to device driver, if needed. */
 512                 if (cdev->private->flags.fake_irb) {
 513                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 514                         cdev->private->irb.scsw = (struct scsw) {
 515                                 .cc = 1,
 516                                 .fctl = SCSW_FCTL_START_FUNC,
 517                                 .actl = SCSW_ACTL_START_PEND,
 518                                 .stctl = SCSW_STCTL_STATUS_PEND,
 519                         };
 520                         cdev->private->flags.fake_irb = 0;
 521                         if (cdev->handler)
 522                                 cdev->handler(cdev, cdev->private->intparm,
 523                                               &cdev->private->irb);
 524                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 525                 }
 526                 break;
 527         case -ETIME:
 528                 ccw_device_done(cdev, DEV_STATE_BOXED);
 529                 break;
 530         default:
 531                 PREPARE_WORK(&cdev->private->kick_work,
 532                              ccw_device_nopath_notify, (void *)cdev);
 533                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 534                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 535                 break;
 536         }
 537 }
 538
 539 /*
 540  * Get device online.
 541  */
 542 int
 543 ccw_device_online(struct ccw_device *cdev)
 544 {
 545         struct subchannel *sch;
 546         int ret;
 547
 548         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 549             (cdev->private->state != DEV_STATE_BOXED))
 550                 return -EINVAL;
 551         sch = to_subchannel(cdev->dev.parent);
 552         if (css_init_done && !get_device(&cdev->dev))
 553                 return -ENODEV;
 554         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 555         if (ret != 0) {
 556                 /* Couldn't enable the subchannel for i/o. Sick device. */
 557                 if (ret == -ENODEV)
 558                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 559                 return ret;
 560         }
 561         /* Do we want to do path grouping? */
 562         if (!cdev->private->options.pgroup) {
 563                 /* No, set state online immediately. */
 564                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 565                 return 0;
 566         }
 567         /* Do a SensePGID first. */
 568         cdev->private->state = DEV_STATE_SENSE_PGID;
 569         ccw_device_sense_pgid_start(cdev);
 570         return 0;
 571 }
 572
 573 void
 574 ccw_device_disband_done(struct ccw_device *cdev, int err)
 575 {
 576         switch (err) {
 577         case 0:
 578                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 579                 break;
 580         case -ETIME:
 581                 ccw_device_done(cdev, DEV_STATE_BOXED);
 582                 break;
 583         default:
 584                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 585                 break;
 586         }
 587 }
 588
 589 /*
 590  * Shutdown device.
 591  */
 592 int
 593 ccw_device_offline(struct ccw_device *cdev)
 594 {
 595         struct subchannel *sch;
 596
 597         sch = to_subchannel(cdev->dev.parent);
 598         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
 599                 return -ENODEV;
 600         if (cdev->private->state != DEV_STATE_ONLINE) {
 601                 if (sch->schib.scsw.actl != 0)
 602                         return -EBUSY;
 603                 return -EINVAL;
 604         }
 605         if (sch->schib.scsw.actl != 0)
 606                 return -EBUSY;
 607         /* Are we doing path grouping? */
 608         if (!cdev->private->options.pgroup) {
 609                 /* No, set state offline immediately. */
 610                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 611                 return 0;
 612         }
 613         /* Start Set Path Group commands. */
 614         cdev->private->state = DEV_STATE_DISBAND_PGID;
 615         ccw_device_disband_start(cdev);
 616         return 0;
 617 }
 618
 619 /*
 620  * Handle timeout in device online/offline process.
 621  */
 622 static void
 623 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 624 {
 625         int ret;
 626
 627         ret = ccw_device_cancel_halt_clear(cdev);
 628         switch (ret) {
 629         case 0:
 630                 ccw_device_done(cdev, DEV_STATE_BOXED);
 631                 break;
 632         case -ENODEV:
 633                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 634                 break;
 635         default:
 636                 ccw_device_set_timeout(cdev, 3*HZ);
 637         }
 638 }
 639
 640 /*
 641  * Handle not oper event in device recognition.
 642  */
 643 static void
 644 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 645 {
 646         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 647 }
 648
 649 /*
 650  * Handle not operational event while offline.
 651  */
 652 static void
 653 ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 654 {
 655         struct subchannel *sch;
 656
 657         cdev->private->state = DEV_STATE_NOT_OPER;
 658         sch = to_subchannel(cdev->dev.parent);
 659         if (get_device(&cdev->dev)) {
 660                 PREPARE_WORK(&cdev->private->kick_work,
 661                              ccw_device_call_sch_unregister, (void *)cdev);
 662                 queue_work(ccw_device_work, &cdev->private->kick_work);
 663         }
 664         wake_up(&cdev->private->wait_q);
 665 }
 666
 667 /*
 668  * Handle not operational event while online.
 669  */
 670 static void
 671 ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 672 {
 673         struct subchannel *sch;
 674
 675         sch = to_subchannel(cdev->dev.parent);
 676         if (sch->driver->notify &&
 677             sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) {
 678                         ccw_device_set_timeout(cdev, 0);
 679                         cdev->private->flags.fake_irb = 0;
 680                         cdev->private->state = DEV_STATE_DISCONNECTED;
 681                         wake_up(&cdev->private->wait_q);
 682                         return;
 683         }
 684         cdev->private->state = DEV_STATE_NOT_OPER;
 685         cio_disable_subchannel(sch);
 686         if (sch->schib.scsw.actl != 0) {
 687                 // FIXME: not-oper indication to device driver ?
 688                 ccw_device_call_handler(cdev);
 689         }
 690         if (get_device(&cdev->dev)) {
 691                 PREPARE_WORK(&cdev->private->kick_work,
 692                              ccw_device_call_sch_unregister, (void *)cdev);
 693                 queue_work(ccw_device_work, &cdev->private->kick_work);
 694         }
 695         wake_up(&cdev->private->wait_q);
 696 }
 697
 698 /*
 699  * Handle path verification event.
 700  */
 701 static void
 702 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 703 {
 704         struct subchannel *sch;
 705
 706         if (!cdev->private->options.pgroup)
 707                 return;
 708         if (cdev->private->state == DEV_STATE_W4SENSE) {
 709                 cdev->private->flags.doverify = 1;
 710                 return;
 711         }
 712         sch = to_subchannel(cdev->dev.parent);
 713         /*
 714          * Since we might not just be coming from an interrupt from the
 715          * subchannel we have to update the schib.
 716          */
 717         stsch(sch->schid, &sch->schib);
 718
 719         if (sch->schib.scsw.actl != 0 ||
 720             (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
 721                 /*
 722                  * No final status yet or final status not yet delivered
 723                  * to the device driver. Can't do path verfication now,
 724                  * delay until final status was delivered.
 725                  */
 726                 cdev->private->flags.doverify = 1;
 727                 return;
 728         }
 729         /* Device is idle, we can do the path verification. */
 730         cdev->private->state = DEV_STATE_VERIFY;
 731         ccw_device_verify_start(cdev);
 732 }
 733
 734 /*
 735  * Got an interrupt for a normal io (state online).
 736  */
 737 static void
 738 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 739 {
 740         struct irb *irb;
 741
 742         irb = (struct irb *) __LC_IRB;
 743         /* Check for unsolicited interrupt. */
 744         if ((irb->scsw.stctl ==
 745                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
 746             && (!irb->scsw.cc)) {
 747                 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 748                     !irb->esw.esw0.erw.cons) {
 749                         /* Unit check but no sense data. Need basic sense. */
 750                         if (ccw_device_do_sense(cdev, irb) != 0)
 751                                 goto call_handler_unsol;
 752                         memcpy(irb, &cdev->private->irb, sizeof(struct irb));
 753                         cdev->private->state = DEV_STATE_W4SENSE;
 754                         cdev->private->intparm = 0;
 755                         return;
 756                 }
 757 call_handler_unsol:
 758                 if (cdev->handler)
 759                         cdev->handler (cdev, 0, irb);
 760                 return;
 761         }
 762         /* Accumulate status and find out if a basic sense is needed. */
 763         ccw_device_accumulate_irb(cdev, irb);
 764         if (cdev->private->flags.dosense) {
 765                 if (ccw_device_do_sense(cdev, irb) == 0) {
 766                         cdev->private->state = DEV_STATE_W4SENSE;
 767                 }
 768                 return;
 769         }
 770         /* Call the handler. */
 771         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 772                 /* Start delayed path verification. */
 773                 ccw_device_online_verify(cdev, 0);
 774 }
 775
 776 /*
 777  * Got an timeout in online state.
 778  */
 779 static void
 780 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 781 {
 782         int ret;
 783
 784         ccw_device_set_timeout(cdev, 0);
 785         ret = ccw_device_cancel_halt_clear(cdev);
 786         if (ret == -EBUSY) {
 787                 ccw_device_set_timeout(cdev, 3*HZ);
 788                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 789                 return;
 790         }
 791         if (ret == -ENODEV) {
 792                 struct subchannel *sch;
 793
 794                 sch = to_subchannel(cdev->dev.parent);
 795                 if (!sch->lpm) {
 796                         PREPARE_WORK(&cdev->private->kick_work,
 797                                      ccw_device_nopath_notify, (void *)cdev);
 798                         queue_work(ccw_device_notify_work,
 799                                    &cdev->private->kick_work);
 800                 } else
 801                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 802         } else if (cdev->handler)
 803                 cdev->handler(cdev, cdev->private->intparm,
 804                               ERR_PTR(-ETIMEDOUT));
 805 }
 806
 807 /*
 808  * Got an interrupt for a basic sense.
 809  */
 810 void
 811 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 812 {
 813         struct irb *irb;
 814
 815         irb = (struct irb *) __LC_IRB;
 816         /* Check for unsolicited interrupt. */
 817         if (irb->scsw.stctl ==
 818                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 819                 if (irb->scsw.cc == 1)
 820                         /* Basic sense hasn't started. Try again. */
 821                         ccw_device_do_sense(cdev, irb);
 822                 else {
 823                         printk("Huh? %s(%s): unsolicited interrupt...\n",
 824                                __FUNCTION__, cdev->dev.bus_id);
 825                         if (cdev->handler)
 826                                 cdev->handler (cdev, 0, irb);
 827                 }
 828                 return;
 829         }
 830         /* Add basic sense info to irb. */
 831         ccw_device_accumulate_basic_sense(cdev, irb);
 832         if (cdev->private->flags.dosense) {
 833                 /* Another basic sense is needed. */
 834                 ccw_device_do_sense(cdev, irb);
 835                 return;
 836         }
 837         cdev->private->state = DEV_STATE_ONLINE;
 838         /* Call the handler. */
 839         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 840                 /* Start delayed path verification. */
 841                 ccw_device_online_verify(cdev, 0);
 842 }
 843
 844 static void
 845 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 846 {
 847         struct irb *irb;
 848
 849         irb = (struct irb *) __LC_IRB;
 850         /* Accumulate status. We don't do basic sense. */
 851         ccw_device_accumulate_irb(cdev, irb);
 852         /* Try to start delayed device verification. */
 853         ccw_device_online_verify(cdev, 0);
 854         /* Note: Don't call handler for cio initiated clear! */
 855 }
 856
 857 static void
 858 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
 859 {
 860         struct subchannel *sch;
 861
 862         sch = to_subchannel(cdev->dev.parent);
 863         ccw_device_set_timeout(cdev, 0);
 864         /* OK, i/o is dead now. Call interrupt handler. */
 865         cdev->private->state = DEV_STATE_ONLINE;
 866         if (cdev->handler)
 867                 cdev->handler(cdev, cdev->private->intparm,
 868                               ERR_PTR(-ETIMEDOUT));
 869         if (!sch->lpm) {
 870                 PREPARE_WORK(&cdev->private->kick_work,
 871                              ccw_device_nopath_notify, (void *)cdev);
 872                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 873         } else if (cdev->private->flags.doverify)
 874                 /* Start delayed path verification. */
 875                 ccw_device_online_verify(cdev, 0);
 876 }
 877
 878 static void
 879 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 880 {
 881         int ret;
 882
 883         ret = ccw_device_cancel_halt_clear(cdev);
 884         if (ret == -EBUSY) {
 885                 ccw_device_set_timeout(cdev, 3*HZ);
 886                 return;
 887         }
 888         if (ret == -ENODEV) {
 889                 struct subchannel *sch;
 890
 891                 sch = to_subchannel(cdev->dev.parent);
 892                 if (!sch->lpm) {
 893                         PREPARE_WORK(&cdev->private->kick_work,
 894                                      ccw_device_nopath_notify, (void *)cdev);
 895                         queue_work(ccw_device_notify_work,
 896                                    &cdev->private->kick_work);
 897                 } else
 898                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 899                 return;
 900         }
 901         //FIXME: Can we get here?
 902         cdev->private->state = DEV_STATE_ONLINE;
 903         if (cdev->handler)
 904                 cdev->handler(cdev, cdev->private->intparm,
 905                               ERR_PTR(-ETIMEDOUT));
 906 }
 907
 908 static void
 909 ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event)
 910 {
 911         struct irb *irb;
 912         struct subchannel *sch;
 913
 914         irb = (struct irb *) __LC_IRB;
 915         /*
 916          * Accumulate status and find out if a basic sense is needed.
 917          * This is fine since we have already adapted the lpm.
 918          */
 919         ccw_device_accumulate_irb(cdev, irb);
 920         if (cdev->private->flags.dosense) {
 921                 if (ccw_device_do_sense(cdev, irb) == 0) {
 922                         cdev->private->state = DEV_STATE_W4SENSE;
 923                 }
 924                 return;
 925         }
 926
 927         /* Iff device is idle, reset timeout. */
 928         sch = to_subchannel(cdev->dev.parent);
 929         if (!stsch(sch->schid, &sch->schib))
 930                 if (sch->schib.scsw.actl == 0)
 931                         ccw_device_set_timeout(cdev, 0);
 932         /* Call the handler. */
 933         ccw_device_call_handler(cdev);
 934         if (!sch->lpm) {
 935                 PREPARE_WORK(&cdev->private->kick_work,
 936                              ccw_device_nopath_notify, (void *)cdev);
 937                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 938         } else if (cdev->private->flags.doverify)
 939                 ccw_device_online_verify(cdev, 0);
 940 }
 941
 942 static void
 943 ccw_device_wait4io_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 944 {
 945         int ret;
 946         struct subchannel *sch;
 947
 948         sch = to_subchannel(cdev->dev.parent);
 949         ccw_device_set_timeout(cdev, 0);
 950         ret = ccw_device_cancel_halt_clear(cdev);
 951         if (ret == -EBUSY) {
 952                 ccw_device_set_timeout(cdev, 3*HZ);
 953                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 954                 return;
 955         }
 956         if (ret == -ENODEV) {
 957                 if (!sch->lpm) {
 958                         PREPARE_WORK(&cdev->private->kick_work,
 959                                      ccw_device_nopath_notify, (void *)cdev);
 960                         queue_work(ccw_device_notify_work,
 961                                    &cdev->private->kick_work);
 962                 } else
 963                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 964                 return;
 965         }
 966         if (cdev->handler)
 967                 cdev->handler(cdev, cdev->private->intparm,
 968                               ERR_PTR(-ETIMEDOUT));
 969         if (!sch->lpm) {
 970                 PREPARE_WORK(&cdev->private->kick_work,
 971                              ccw_device_nopath_notify, (void *)cdev);
 972                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 973         } else if (cdev->private->flags.doverify)
 974                 /* Start delayed path verification. */
 975                 ccw_device_online_verify(cdev, 0);
 976 }
 977
 978 static void
 979 ccw_device_wait4io_verify(struct ccw_device *cdev, enum dev_event dev_event)
 980 {
 981         /* When the I/O has terminated, we have to start verification. */
 982         if (cdev->private->options.pgroup)
 983                 cdev->private->flags.doverify = 1;
 984 }
 985
 986 static void
 987 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
 988 {
 989         struct irb *irb;
 990
 991         switch (dev_event) {
 992         case DEV_EVENT_INTERRUPT:
 993                 irb = (struct irb *) __LC_IRB;
 994                 /* Check for unsolicited interrupt. */
 995                 if ((irb->scsw.stctl ==
 996                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
 997                     (!irb->scsw.cc))
 998                         /* FIXME: we should restart stlck here, but this
 999                          * is extremely unlikely ... */
1000                         goto out_wakeup;
1001
1002                 ccw_device_accumulate_irb(cdev, irb);
1003                 /* We don't care about basic sense etc. */
1004                 break;
1005         default: /* timeout */
1006                 break;
1007         }
1008 out_wakeup:
1009         wake_up(&cdev->private->wait_q);
1010 }
1011
1012 static void
1013 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1014 {
1015         struct subchannel *sch;
1016
1017         sch = to_subchannel(cdev->dev.parent);
1018         if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1019                 /* Couldn't enable the subchannel for i/o. Sick device. */
1020                 return;
1021
1022         /* After 60s the device recognition is considered to have failed. */
1023         ccw_device_set_timeout(cdev, 60*HZ);
1024
1025         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1026         ccw_device_sense_id_start(cdev);
1027 }
1028
1029 void
1030 device_trigger_reprobe(struct subchannel *sch)
1031 {
1032         struct ccw_device *cdev;
1033
1034         if (!sch->dev.driver_data)
1035                 return;
1036         cdev = sch->dev.driver_data;
1037         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1038                 return;
1039
1040         /* Update some values. */
1041         if (stsch(sch->schid, &sch->schib))
1042                 return;
1043
1044         /*
1045          * The pim, pam, pom values may not be accurate, but they are the best
1046          * we have before performing device selection :/
1047          */
1048         sch->lpm = sch->schib.pmcw.pim &
1049                 sch->schib.pmcw.pam &
1050                 sch->schib.pmcw.pom &
1051                 sch->opm;
1052         /* Re-set some bits in the pmcw that were lost. */
1053         sch->schib.pmcw.isc = 3;
1054         sch->schib.pmcw.csense = 1;
1055         sch->schib.pmcw.ena = 0;
1056         if ((sch->lpm & (sch->lpm - 1)) != 0)
1057                 sch->schib.pmcw.mp = 1;
1058         sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1059         /* We should also udate ssd info, but this has to wait. */
1060         ccw_device_start_id(cdev, 0);
1061 }
1062
1063 static void
1064 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1065 {
1066         struct subchannel *sch;
1067
1068         sch = to_subchannel(cdev->dev.parent);
1069         /*
1070          * An interrupt in state offline means a previous disable was not
1071          * successful. Try again.
1072          */
1073         cio_disable_subchannel(sch);
1074 }
1075
1076 static void
1077 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1078 {
1079         retry_set_schib(cdev);
1080         cdev->private->state = DEV_STATE_ONLINE;
1081         dev_fsm_event(cdev, dev_event);
1082 }
1083
1084
1085 static void
1086 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1087 {
1088         ccw_device_set_timeout(cdev, 0);
1089         if (dev_event == DEV_EVENT_NOTOPER)
1090                 cdev->private->state = DEV_STATE_NOT_OPER;
1091         else
1092                 cdev->private->state = DEV_STATE_OFFLINE;
1093         wake_up(&cdev->private->wait_q);
1094 }
1095
1096 static void
1097 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1098 {
1099         int ret;
1100
1101         ret = ccw_device_cancel_halt_clear(cdev);
1102         switch (ret) {
1103         case 0:
1104                 cdev->private->state = DEV_STATE_OFFLINE;
1105                 wake_up(&cdev->private->wait_q);
1106                 break;
1107         case -ENODEV:
1108                 cdev->private->state = DEV_STATE_NOT_OPER;
1109                 wake_up(&cdev->private->wait_q);
1110                 break;
1111         default:
1112                 ccw_device_set_timeout(cdev, HZ/10);
1113         }
1114 }
1115
1116 /*
1117  * No operation action. This is used e.g. to ignore a timeout event in
1118  * state offline.
1119  */
1120 static void
1121 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1122 {
1123 }
1124
1125 /*
1126  * Bug operation action.
1127  */
1128 static void
1129 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1130 {
1131         printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
1132                cdev->private->state, dev_event);
1133         BUG();
1134 }
1135
1136 /*
1137  * device statemachine
1138  */
1139 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1140         [DEV_STATE_NOT_OPER] = {
1141                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1142                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1143                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1144                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1145         },
1146         [DEV_STATE_SENSE_PGID] = {
1147                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1148                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1149                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1150                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1151         },
1152         [DEV_STATE_SENSE_ID] = {
1153                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1154                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1155                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1156                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1157         },
1158         [DEV_STATE_OFFLINE] = {
1159                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1160                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1161                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1162                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1163         },
1164         [DEV_STATE_VERIFY] = {
1165                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1166                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1167                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1168                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1169         },
1170         [DEV_STATE_ONLINE] = {
1171                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1172                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1173                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1174                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1175         },
1176         [DEV_STATE_W4SENSE] = {
1177                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1178                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1179                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1180                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1181         },
1182         [DEV_STATE_DISBAND_PGID] = {
1183                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1184                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1185                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1186                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1187         },
1188         [DEV_STATE_BOXED] = {
1189                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1190                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1191                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1192                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1193         },
1194         /* states to wait for i/o completion before doing something */
1195         [DEV_STATE_CLEAR_VERIFY] = {
1196                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1197                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1198                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1199                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1200         },
1201         [DEV_STATE_TIMEOUT_KILL] = {
1202                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1203                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1204                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1205                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1206         },
1207         [DEV_STATE_WAIT4IO] = {
1208                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1209                 [DEV_EVENT_INTERRUPT]   = ccw_device_wait4io_irq,
1210                 [DEV_EVENT_TIMEOUT]     = ccw_device_wait4io_timeout,
1211                 [DEV_EVENT_VERIFY]      = ccw_device_wait4io_verify,
1212         },
1213         [DEV_STATE_QUIESCE] = {
1214                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1215                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1216                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1217                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1218         },
1219         /* special states for devices gone not operational */
1220         [DEV_STATE_DISCONNECTED] = {
1221                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1222                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1223                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1224                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1225         },
1226         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1227                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1228                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1229                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1230                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1231         },
1232         [DEV_STATE_CMFCHANGE] = {
1233                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1234                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1235                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1236                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1237         },
1238 };
1239
1240 /*
1241  * io_subchannel_irq is called for "real" interrupts or for status
1242  * pending conditions on msch.
1243  */
1244 void
1245 io_subchannel_irq (struct device *pdev)
1246 {
1247         struct ccw_device *cdev;
1248
1249         cdev = to_subchannel(pdev)->dev.driver_data;
1250
1251         CIO_TRACE_EVENT (3, "IRQ");
1252         CIO_TRACE_EVENT (3, pdev->bus_id);
1253         if (cdev)
1254                 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1255 }
1256
1257 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);