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                         if (ret != -EBUSY)
 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.pam & sch->opm;
 236         /* Check since device may again have become not operational. */
 237         if (!sch->schib.pmcw.dnv)
 238                 state = DEV_STATE_NOT_OPER;
 239         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
 240                 /* Force reprobe on all chpids. */
 241                 old_lpm = 0;
 242         if (sch->lpm != old_lpm)
 243                 __recover_lost_chpids(sch, old_lpm);
 244         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 245                 if (state == DEV_STATE_NOT_OPER) {
 246                         cdev->private->flags.recog_done = 1;
 247                         cdev->private->state = DEV_STATE_DISCONNECTED;
 248                         return;
 249                 }
 250                 /* Boxed devices don't need extra treatment. */
 251         }
 252         notify = 0;
 253         same_dev = 0; /* Keep the compiler quiet... */
 254         switch (state) {
 255         case DEV_STATE_NOT_OPER:
 256                 CIO_DEBUG(KERN_WARNING, 2,
 257                           "SenseID : unknown device %04x on subchannel "
 258                           "0.%x.%04x\n", cdev->private->devno,
 259                           sch->schid.ssid, sch->schid.sch_no);
 260                 break;
 261         case DEV_STATE_OFFLINE:
 262                 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 263                         same_dev = ccw_device_handle_oper(cdev);
 264                         notify = 1;
 265                 }
 266                 /* fill out sense information */
 267                 memset(&cdev->id, 0, sizeof(cdev->id));
 268                 cdev->id.cu_type   = cdev->private->senseid.cu_type;
 269                 cdev->id.cu_model  = cdev->private->senseid.cu_model;
 270                 cdev->id.dev_type  = cdev->private->senseid.dev_type;
 271                 cdev->id.dev_model = cdev->private->senseid.dev_model;
 272                 if (notify) {
 273                         cdev->private->state = DEV_STATE_OFFLINE;
 274                         if (same_dev) {
 275                                 /* Get device online again. */
 276                                 ccw_device_online(cdev);
 277                                 wake_up(&cdev->private->wait_q);
 278                         }
 279                         return;
 280                 }
 281                 /* Issue device info message. */
 282                 CIO_DEBUG(KERN_INFO, 2, "SenseID : device 0.%x.%04x reports: "
 283                           "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
 284                           "%04X/%02X\n",
 285                           cdev->private->ssid, cdev->private->devno,
 286                           cdev->id.cu_type, cdev->id.cu_model,
 287                           cdev->id.dev_type, cdev->id.dev_model);
 288                 break;
 289         case DEV_STATE_BOXED:
 290                 CIO_DEBUG(KERN_WARNING, 2,
 291                           "SenseID : boxed device %04x on subchannel "
 292                           "0.%x.%04x\n", cdev->private->devno,
 293                           sch->schid.ssid, sch->schid.sch_no);
 294                 break;
 295         }
 296         cdev->private->state = state;
 297         io_subchannel_recog_done(cdev);
 298         if (state != DEV_STATE_NOT_OPER)
 299                 wake_up(&cdev->private->wait_q);
 300 }
 301
 302 /*
 303  * Function called from device_id.c after sense id has completed.
 304  */
 305 void
 306 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
 307 {
 308         switch (err) {
 309         case 0:
 310                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
 311                 break;
 312         case -ETIME:            /* Sense id stopped by timeout. */
 313                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 314                 break;
 315         default:
 316                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 317                 break;
 318         }
 319 }
 320
 321 static void
 322 ccw_device_oper_notify(void *data)
 323 {
 324         struct ccw_device *cdev;
 325         struct subchannel *sch;
 326         int ret;
 327
 328         cdev = (struct ccw_device *)data;
 329         sch = to_subchannel(cdev->dev.parent);
 330         ret = (sch->driver && sch->driver->notify) ?
 331                 sch->driver->notify(&sch->dev, CIO_OPER) : 0;
 332         if (!ret)
 333                 /* Driver doesn't want device back. */
 334                 ccw_device_do_unreg_rereg((void *)cdev);
 335         else {
 336                 /* Reenable channel measurements, if needed. */
 337                 cmf_reenable(cdev);
 338                 wake_up(&cdev->private->wait_q);
 339         }
 340 }
 341
 342 /*
 343  * Finished with online/offline processing.
 344  */
 345 static void
 346 ccw_device_done(struct ccw_device *cdev, int state)
 347 {
 348         struct subchannel *sch;
 349
 350         sch = to_subchannel(cdev->dev.parent);
 351
 352         if (state != DEV_STATE_ONLINE)
 353                 cio_disable_subchannel(sch);
 354
 355         /* Reset device status. */
 356         memset(&cdev->private->irb, 0, sizeof(struct irb));
 357
 358         cdev->private->state = state;
 359
 360
 361         if (state == DEV_STATE_BOXED)
 362                 CIO_DEBUG(KERN_WARNING, 2,
 363                           "Boxed device %04x on subchannel %04x\n",
 364                           cdev->private->devno, sch->schid.sch_no);
 365
 366         if (cdev->private->flags.donotify) {
 367                 cdev->private->flags.donotify = 0;
 368                 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify,
 369                              (void *)cdev);
 370                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 371         }
 372         wake_up(&cdev->private->wait_q);
 373
 374         if (css_init_done && state != DEV_STATE_ONLINE)
 375                 put_device (&cdev->dev);
 376 }
 377
 378 static inline int cmp_pgid(struct pgid *p1, struct pgid *p2)
 379 {
 380         char *c1;
 381         char *c2;
 382
 383         c1 = (char *)p1;
 384         c2 = (char *)p2;
 385
 386         return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
 387 }
 388
 389 static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
 390 {
 391         int i;
 392         int last;
 393
 394         last = 0;
 395         for (i = 0; i < 8; i++) {
 396                 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
 397                         /* No PGID yet */
 398                         continue;
 399                 if (cdev->private->pgid[last].inf.ps.state1 ==
 400                     SNID_STATE1_RESET) {
 401                         /* First non-zero PGID */
 402                         last = i;
 403                         continue;
 404                 }
 405                 if (cmp_pgid(&cdev->private->pgid[i],
 406                              &cdev->private->pgid[last]) == 0)
 407                         /* Non-conflicting PGIDs */
 408                         continue;
 409
 410                 /* PGID mismatch, can't pathgroup. */
 411                 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
 412                               "0.%x.%04x, can't pathgroup\n",
 413                               cdev->private->ssid, cdev->private->devno);
 414                 cdev->private->options.pgroup = 0;
 415                 return;
 416         }
 417         if (cdev->private->pgid[last].inf.ps.state1 ==
 418             SNID_STATE1_RESET)
 419                 /* No previous pgid found */
 420                 memcpy(&cdev->private->pgid[0], &css[0]->global_pgid,
 421                        sizeof(struct pgid));
 422         else
 423                 /* Use existing pgid */
 424                 memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
 425                        sizeof(struct pgid));
 426 }
 427
 428 /*
 429  * Function called from device_pgid.c after sense path ground has completed.
 430  */
 431 void
 432 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
 433 {
 434         struct subchannel *sch;
 435
 436         sch = to_subchannel(cdev->dev.parent);
 437         switch (err) {
 438         case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
 439                 cdev->private->options.pgroup = 0;
 440                 break;
 441         case 0: /* success */
 442         case -EACCES: /* partial success, some paths not operational */
 443                 /* Check if all pgids are equal or 0. */
 444                 __ccw_device_get_common_pgid(cdev);
 445                 break;
 446         case -ETIME:            /* Sense path group id stopped by timeout. */
 447         case -EUSERS:           /* device is reserved for someone else. */
 448                 ccw_device_done(cdev, DEV_STATE_BOXED);
 449                 return;
 450         default:
 451                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 452                 return;
 453         }
 454         /* Start Path Group verification. */
 455         cdev->private->state = DEV_STATE_VERIFY;
 456         cdev->private->flags.doverify = 0;
 457         ccw_device_verify_start(cdev);
 458 }
 459
 460 /*
 461  * Start device recognition.
 462  */
 463 int
 464 ccw_device_recognition(struct ccw_device *cdev)
 465 {
 466         struct subchannel *sch;
 467         int ret;
 468
 469         if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
 470             (cdev->private->state != DEV_STATE_BOXED))
 471                 return -EINVAL;
 472         sch = to_subchannel(cdev->dev.parent);
 473         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 474         if (ret != 0)
 475                 /* Couldn't enable the subchannel for i/o. Sick device. */
 476                 return ret;
 477
 478         /* After 60s the device recognition is considered to have failed. */
 479         ccw_device_set_timeout(cdev, 60*HZ);
 480
 481         /*
 482          * We used to start here with a sense pgid to find out whether a device
 483          * is locked by someone else. Unfortunately, the sense pgid command
 484          * code has other meanings on devices predating the path grouping
 485          * algorithm, so we start with sense id and box the device after an
 486          * timeout (or if sense pgid during path verification detects the device
 487          * is locked, as may happen on newer devices).
 488          */
 489         cdev->private->flags.recog_done = 0;
 490         cdev->private->state = DEV_STATE_SENSE_ID;
 491         ccw_device_sense_id_start(cdev);
 492         return 0;
 493 }
 494
 495 /*
 496  * Handle timeout in device recognition.
 497  */
 498 static void
 499 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 500 {
 501         int ret;
 502
 503         ret = ccw_device_cancel_halt_clear(cdev);
 504         switch (ret) {
 505         case 0:
 506                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 507                 break;
 508         case -ENODEV:
 509                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 510                 break;
 511         default:
 512                 ccw_device_set_timeout(cdev, 3*HZ);
 513         }
 514 }
 515
 516
 517 static void
 518 ccw_device_nopath_notify(void *data)
 519 {
 520         struct ccw_device *cdev;
 521         struct subchannel *sch;
 522         int ret;
 523
 524         cdev = (struct ccw_device *)data;
 525         sch = to_subchannel(cdev->dev.parent);
 526         /* Extra sanity. */
 527         if (sch->lpm)
 528                 return;
 529         ret = (sch->driver && sch->driver->notify) ?
 530                 sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0;
 531         if (!ret) {
 532                 if (get_device(&sch->dev)) {
 533                         /* Driver doesn't want to keep device. */
 534                         cio_disable_subchannel(sch);
 535                         if (get_device(&cdev->dev)) {
 536                                 PREPARE_WORK(&cdev->private->kick_work,
 537                                              ccw_device_call_sch_unregister,
 538                                              (void *)cdev);
 539                                 queue_work(ccw_device_work,
 540                                            &cdev->private->kick_work);
 541                         } else
 542                                 put_device(&sch->dev);
 543                 }
 544         } else {
 545                 cio_disable_subchannel(sch);
 546                 ccw_device_set_timeout(cdev, 0);
 547                 cdev->private->flags.fake_irb = 0;
 548                 cdev->private->state = DEV_STATE_DISCONNECTED;
 549                 wake_up(&cdev->private->wait_q);
 550         }
 551 }
 552
 553 void
 554 ccw_device_verify_done(struct ccw_device *cdev, int err)
 555 {
 556         struct subchannel *sch;
 557
 558         sch = to_subchannel(cdev->dev.parent);
 559         /* Update schib - pom may have changed. */
 560         stsch(sch->schid, &sch->schib);
 561         /* Update lpm with verified path mask. */
 562         sch->lpm = sch->vpm;
 563         /* Repeat path verification? */
 564         if (cdev->private->flags.doverify) {
 565                 cdev->private->flags.doverify = 0;
 566                 ccw_device_verify_start(cdev);
 567                 return;
 568         }
 569         switch (err) {
 570         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 571                 cdev->private->options.pgroup = 0;
 572         case 0:
 573                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 574                 /* Deliver fake irb to device driver, if needed. */
 575                 if (cdev->private->flags.fake_irb) {
 576                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 577                         cdev->private->irb.scsw.cc = 1;
 578                         cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC;
 579                         cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND;
 580                         cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND;
 581                         cdev->private->flags.fake_irb = 0;
 582                         if (cdev->handler)
 583                                 cdev->handler(cdev, cdev->private->intparm,
 584                                               &cdev->private->irb);
 585                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 586                 }
 587                 break;
 588         case -ETIME:
 589                 ccw_device_done(cdev, DEV_STATE_BOXED);
 590                 break;
 591         default:
 592                 PREPARE_WORK(&cdev->private->kick_work,
 593                              ccw_device_nopath_notify, (void *)cdev);
 594                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 595                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 596                 break;
 597         }
 598 }
 599
 600 /*
 601  * Get device online.
 602  */
 603 int
 604 ccw_device_online(struct ccw_device *cdev)
 605 {
 606         struct subchannel *sch;
 607         int ret;
 608
 609         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 610             (cdev->private->state != DEV_STATE_BOXED))
 611                 return -EINVAL;
 612         sch = to_subchannel(cdev->dev.parent);
 613         if (css_init_done && !get_device(&cdev->dev))
 614                 return -ENODEV;
 615         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 616         if (ret != 0) {
 617                 /* Couldn't enable the subchannel for i/o. Sick device. */
 618                 if (ret == -ENODEV)
 619                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 620                 return ret;
 621         }
 622         /* Do we want to do path grouping? */
 623         if (!cdev->private->options.pgroup) {
 624                 /* Start initial path verification. */
 625                 cdev->private->state = DEV_STATE_VERIFY;
 626                 cdev->private->flags.doverify = 0;
 627                 ccw_device_verify_start(cdev);
 628                 return 0;
 629         }
 630         /* Do a SensePGID first. */
 631         cdev->private->state = DEV_STATE_SENSE_PGID;
 632         ccw_device_sense_pgid_start(cdev);
 633         return 0;
 634 }
 635
 636 void
 637 ccw_device_disband_done(struct ccw_device *cdev, int err)
 638 {
 639         switch (err) {
 640         case 0:
 641                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 642                 break;
 643         case -ETIME:
 644                 ccw_device_done(cdev, DEV_STATE_BOXED);
 645                 break;
 646         default:
 647                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 648                 break;
 649         }
 650 }
 651
 652 /*
 653  * Shutdown device.
 654  */
 655 int
 656 ccw_device_offline(struct ccw_device *cdev)
 657 {
 658         struct subchannel *sch;
 659
 660         sch = to_subchannel(cdev->dev.parent);
 661         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
 662                 return -ENODEV;
 663         if (cdev->private->state != DEV_STATE_ONLINE) {
 664                 if (sch->schib.scsw.actl != 0)
 665                         return -EBUSY;
 666                 return -EINVAL;
 667         }
 668         if (sch->schib.scsw.actl != 0)
 669                 return -EBUSY;
 670         /* Are we doing path grouping? */
 671         if (!cdev->private->options.pgroup) {
 672                 /* No, set state offline immediately. */
 673                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 674                 return 0;
 675         }
 676         /* Start Set Path Group commands. */
 677         cdev->private->state = DEV_STATE_DISBAND_PGID;
 678         ccw_device_disband_start(cdev);
 679         return 0;
 680 }
 681
 682 /*
 683  * Handle timeout in device online/offline process.
 684  */
 685 static void
 686 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 687 {
 688         int ret;
 689
 690         ret = ccw_device_cancel_halt_clear(cdev);
 691         switch (ret) {
 692         case 0:
 693                 ccw_device_done(cdev, DEV_STATE_BOXED);
 694                 break;
 695         case -ENODEV:
 696                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 697                 break;
 698         default:
 699                 ccw_device_set_timeout(cdev, 3*HZ);
 700         }
 701 }
 702
 703 /*
 704  * Handle not oper event in device recognition.
 705  */
 706 static void
 707 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 708 {
 709         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 710 }
 711
 712 /*
 713  * Handle not operational event while offline.
 714  */
 715 static void
 716 ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 717 {
 718         struct subchannel *sch;
 719
 720         cdev->private->state = DEV_STATE_NOT_OPER;
 721         sch = to_subchannel(cdev->dev.parent);
 722         if (get_device(&cdev->dev)) {
 723                 PREPARE_WORK(&cdev->private->kick_work,
 724                              ccw_device_call_sch_unregister, (void *)cdev);
 725                 queue_work(ccw_device_work, &cdev->private->kick_work);
 726         }
 727         wake_up(&cdev->private->wait_q);
 728 }
 729
 730 /*
 731  * Handle not operational event while online.
 732  */
 733 static void
 734 ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 735 {
 736         struct subchannel *sch;
 737
 738         sch = to_subchannel(cdev->dev.parent);
 739         if (sch->driver->notify &&
 740             sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) {
 741                         ccw_device_set_timeout(cdev, 0);
 742                         cdev->private->flags.fake_irb = 0;
 743                         cdev->private->state = DEV_STATE_DISCONNECTED;
 744                         wake_up(&cdev->private->wait_q);
 745                         return;
 746         }
 747         cdev->private->state = DEV_STATE_NOT_OPER;
 748         cio_disable_subchannel(sch);
 749         if (sch->schib.scsw.actl != 0) {
 750                 // FIXME: not-oper indication to device driver ?
 751                 ccw_device_call_handler(cdev);
 752         }
 753         if (get_device(&cdev->dev)) {
 754                 PREPARE_WORK(&cdev->private->kick_work,
 755                              ccw_device_call_sch_unregister, (void *)cdev);
 756                 queue_work(ccw_device_work, &cdev->private->kick_work);
 757         }
 758         wake_up(&cdev->private->wait_q);
 759 }
 760
 761 /*
 762  * Handle path verification event.
 763  */
 764 static void
 765 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 766 {
 767         struct subchannel *sch;
 768
 769         if (cdev->private->state == DEV_STATE_W4SENSE) {
 770                 cdev->private->flags.doverify = 1;
 771                 return;
 772         }
 773         sch = to_subchannel(cdev->dev.parent);
 774         /*
 775          * Since we might not just be coming from an interrupt from the
 776          * subchannel we have to update the schib.
 777          */
 778         stsch(sch->schid, &sch->schib);
 779
 780         if (sch->schib.scsw.actl != 0 ||
 781             (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) ||
 782             (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
 783                 /*
 784                  * No final status yet or final status not yet delivered
 785                  * to the device driver. Can't do path verfication now,
 786                  * delay until final status was delivered.
 787                  */
 788                 cdev->private->flags.doverify = 1;
 789                 return;
 790         }
 791         /* Device is idle, we can do the path verification. */
 792         cdev->private->state = DEV_STATE_VERIFY;
 793         cdev->private->flags.doverify = 0;
 794         ccw_device_verify_start(cdev);
 795 }
 796
 797 /*
 798  * Got an interrupt for a normal io (state online).
 799  */
 800 static void
 801 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 802 {
 803         struct irb *irb;
 804
 805         irb = (struct irb *) __LC_IRB;
 806         /* Check for unsolicited interrupt. */
 807         if ((irb->scsw.stctl ==
 808                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
 809             && (!irb->scsw.cc)) {
 810                 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 811                     !irb->esw.esw0.erw.cons) {
 812                         /* Unit check but no sense data. Need basic sense. */
 813                         if (ccw_device_do_sense(cdev, irb) != 0)
 814                                 goto call_handler_unsol;
 815                         memcpy(&cdev->private->irb, irb, sizeof(struct irb));
 816                         cdev->private->state = DEV_STATE_W4SENSE;
 817                         cdev->private->intparm = 0;
 818                         return;
 819                 }
 820 call_handler_unsol:
 821                 if (cdev->handler)
 822                         cdev->handler (cdev, 0, irb);
 823                 return;
 824         }
 825         /* Accumulate status and find out if a basic sense is needed. */
 826         ccw_device_accumulate_irb(cdev, irb);
 827         if (cdev->private->flags.dosense) {
 828                 if (ccw_device_do_sense(cdev, irb) == 0) {
 829                         cdev->private->state = DEV_STATE_W4SENSE;
 830                 }
 831                 return;
 832         }
 833         /* Call the handler. */
 834         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 835                 /* Start delayed path verification. */
 836                 ccw_device_online_verify(cdev, 0);
 837 }
 838
 839 /*
 840  * Got an timeout in online state.
 841  */
 842 static void
 843 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 844 {
 845         int ret;
 846
 847         ccw_device_set_timeout(cdev, 0);
 848         ret = ccw_device_cancel_halt_clear(cdev);
 849         if (ret == -EBUSY) {
 850                 ccw_device_set_timeout(cdev, 3*HZ);
 851                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 852                 return;
 853         }
 854         if (ret == -ENODEV) {
 855                 struct subchannel *sch;
 856
 857                 sch = to_subchannel(cdev->dev.parent);
 858                 if (!sch->lpm) {
 859                         PREPARE_WORK(&cdev->private->kick_work,
 860                                      ccw_device_nopath_notify, (void *)cdev);
 861                         queue_work(ccw_device_notify_work,
 862                                    &cdev->private->kick_work);
 863                 } else
 864                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 865         } else if (cdev->handler)
 866                 cdev->handler(cdev, cdev->private->intparm,
 867                               ERR_PTR(-ETIMEDOUT));
 868 }
 869
 870 /*
 871  * Got an interrupt for a basic sense.
 872  */
 873 void
 874 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 875 {
 876         struct irb *irb;
 877
 878         irb = (struct irb *) __LC_IRB;
 879         /* Check for unsolicited interrupt. */
 880         if (irb->scsw.stctl ==
 881                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 882                 if (irb->scsw.cc == 1)
 883                         /* Basic sense hasn't started. Try again. */
 884                         ccw_device_do_sense(cdev, irb);
 885                 else {
 886                         printk("Huh? %s(%s): unsolicited interrupt...\n",
 887                                __FUNCTION__, cdev->dev.bus_id);
 888                         if (cdev->handler)
 889                                 cdev->handler (cdev, 0, irb);
 890                 }
 891                 return;
 892         }
 893         /*
 894          * Check if a halt or clear has been issued in the meanwhile. If yes,
 895          * only deliver the halt/clear interrupt to the device driver as if it
 896          * had killed the original request.
 897          */
 898         if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
 899                 cdev->private->flags.dosense = 0;
 900                 memset(&cdev->private->irb, 0, sizeof(struct irb));
 901                 ccw_device_accumulate_irb(cdev, irb);
 902                 goto call_handler;
 903         }
 904         /* Add basic sense info to irb. */
 905         ccw_device_accumulate_basic_sense(cdev, irb);
 906         if (cdev->private->flags.dosense) {
 907                 /* Another basic sense is needed. */
 908                 ccw_device_do_sense(cdev, irb);
 909                 return;
 910         }
 911 call_handler:
 912         cdev->private->state = DEV_STATE_ONLINE;
 913         /* Call the handler. */
 914         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 915                 /* Start delayed path verification. */
 916                 ccw_device_online_verify(cdev, 0);
 917 }
 918
 919 static void
 920 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 921 {
 922         struct irb *irb;
 923
 924         irb = (struct irb *) __LC_IRB;
 925         /* Accumulate status. We don't do basic sense. */
 926         ccw_device_accumulate_irb(cdev, irb);
 927         /* Remember to clear irb to avoid residuals. */
 928         memset(&cdev->private->irb, 0, sizeof(struct irb));
 929         /* Try to start delayed device verification. */
 930         ccw_device_online_verify(cdev, 0);
 931         /* Note: Don't call handler for cio initiated clear! */
 932 }
 933
 934 static void
 935 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
 936 {
 937         struct subchannel *sch;
 938
 939         sch = to_subchannel(cdev->dev.parent);
 940         ccw_device_set_timeout(cdev, 0);
 941         /* OK, i/o is dead now. Call interrupt handler. */
 942         cdev->private->state = DEV_STATE_ONLINE;
 943         if (cdev->handler)
 944                 cdev->handler(cdev, cdev->private->intparm,
 945                               ERR_PTR(-ETIMEDOUT));
 946         if (!sch->lpm) {
 947                 PREPARE_WORK(&cdev->private->kick_work,
 948                              ccw_device_nopath_notify, (void *)cdev);
 949                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 950         } else if (cdev->private->flags.doverify)
 951                 /* Start delayed path verification. */
 952                 ccw_device_online_verify(cdev, 0);
 953 }
 954
 955 static void
 956 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 957 {
 958         int ret;
 959
 960         ret = ccw_device_cancel_halt_clear(cdev);
 961         if (ret == -EBUSY) {
 962                 ccw_device_set_timeout(cdev, 3*HZ);
 963                 return;
 964         }
 965         if (ret == -ENODEV) {
 966                 struct subchannel *sch;
 967
 968                 sch = to_subchannel(cdev->dev.parent);
 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,
 973                                    &cdev->private->kick_work);
 974                 } else
 975                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 976                 return;
 977         }
 978         //FIXME: Can we get here?
 979         cdev->private->state = DEV_STATE_ONLINE;
 980         if (cdev->handler)
 981                 cdev->handler(cdev, cdev->private->intparm,
 982                               ERR_PTR(-ETIMEDOUT));
 983 }
 984
 985 static void
 986 ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event)
 987 {
 988         struct irb *irb;
 989         struct subchannel *sch;
 990
 991         irb = (struct irb *) __LC_IRB;
 992         /*
 993          * Accumulate status and find out if a basic sense is needed.
 994          * This is fine since we have already adapted the lpm.
 995          */
 996         ccw_device_accumulate_irb(cdev, irb);
 997         if (cdev->private->flags.dosense) {
 998                 if (ccw_device_do_sense(cdev, irb) == 0) {
 999                         cdev->private->state = DEV_STATE_W4SENSE;
1000                 }
1001                 return;
1002         }
1003
1004         /* Iff device is idle, reset timeout. */
1005         sch = to_subchannel(cdev->dev.parent);
1006         if (!stsch(sch->schid, &sch->schib))
1007                 if (sch->schib.scsw.actl == 0)
1008                         ccw_device_set_timeout(cdev, 0);
1009         /* Call the handler. */
1010         ccw_device_call_handler(cdev);
1011         if (!sch->lpm) {
1012                 PREPARE_WORK(&cdev->private->kick_work,
1013                              ccw_device_nopath_notify, (void *)cdev);
1014                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
1015         } else if (cdev->private->flags.doverify)
1016                 ccw_device_online_verify(cdev, 0);
1017 }
1018
1019 static void
1020 ccw_device_wait4io_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1021 {
1022         int ret;
1023         struct subchannel *sch;
1024
1025         sch = to_subchannel(cdev->dev.parent);
1026         ccw_device_set_timeout(cdev, 0);
1027         ret = ccw_device_cancel_halt_clear(cdev);
1028         if (ret == -EBUSY) {
1029                 ccw_device_set_timeout(cdev, 3*HZ);
1030                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
1031                 return;
1032         }
1033         if (ret == -ENODEV) {
1034                 if (!sch->lpm) {
1035                         PREPARE_WORK(&cdev->private->kick_work,
1036                                      ccw_device_nopath_notify, (void *)cdev);
1037                         queue_work(ccw_device_notify_work,
1038                                    &cdev->private->kick_work);
1039                 } else
1040                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1041                 return;
1042         }
1043         if (cdev->handler)
1044                 cdev->handler(cdev, cdev->private->intparm,
1045                               ERR_PTR(-ETIMEDOUT));
1046         if (!sch->lpm) {
1047                 PREPARE_WORK(&cdev->private->kick_work,
1048                              ccw_device_nopath_notify, (void *)cdev);
1049                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
1050         } else if (cdev->private->flags.doverify)
1051                 /* Start delayed path verification. */
1052                 ccw_device_online_verify(cdev, 0);
1053 }
1054
1055 static void
1056 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
1057 {
1058         /* Start verification after current task finished. */
1059         cdev->private->flags.doverify = 1;
1060 }
1061
1062 static void
1063 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1064 {
1065         struct irb *irb;
1066
1067         switch (dev_event) {
1068         case DEV_EVENT_INTERRUPT:
1069                 irb = (struct irb *) __LC_IRB;
1070                 /* Check for unsolicited interrupt. */
1071                 if ((irb->scsw.stctl ==
1072                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1073                     (!irb->scsw.cc))
1074                         /* FIXME: we should restart stlck here, but this
1075                          * is extremely unlikely ... */
1076                         goto out_wakeup;
1077
1078                 ccw_device_accumulate_irb(cdev, irb);
1079                 /* We don't care about basic sense etc. */
1080                 break;
1081         default: /* timeout */
1082                 break;
1083         }
1084 out_wakeup:
1085         wake_up(&cdev->private->wait_q);
1086 }
1087
1088 static void
1089 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1090 {
1091         struct subchannel *sch;
1092
1093         sch = to_subchannel(cdev->dev.parent);
1094         if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1095                 /* Couldn't enable the subchannel for i/o. Sick device. */
1096                 return;
1097
1098         /* After 60s the device recognition is considered to have failed. */
1099         ccw_device_set_timeout(cdev, 60*HZ);
1100
1101         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1102         ccw_device_sense_id_start(cdev);
1103 }
1104
1105 void
1106 device_trigger_reprobe(struct subchannel *sch)
1107 {
1108         struct ccw_device *cdev;
1109
1110         if (!sch->dev.driver_data)
1111                 return;
1112         cdev = sch->dev.driver_data;
1113         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1114                 return;
1115
1116         /* Update some values. */
1117         if (stsch(sch->schid, &sch->schib))
1118                 return;
1119
1120         /*
1121          * The pim, pam, pom values may not be accurate, but they are the best
1122          * we have before performing device selection :/
1123          */
1124         sch->lpm = sch->schib.pmcw.pam & sch->opm;
1125         /* Re-set some bits in the pmcw that were lost. */
1126         sch->schib.pmcw.isc = 3;
1127         sch->schib.pmcw.csense = 1;
1128         sch->schib.pmcw.ena = 0;
1129         if ((sch->lpm & (sch->lpm - 1)) != 0)
1130                 sch->schib.pmcw.mp = 1;
1131         sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1132         /* We should also udate ssd info, but this has to wait. */
1133         ccw_device_start_id(cdev, 0);
1134 }
1135
1136 static void
1137 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1138 {
1139         struct subchannel *sch;
1140
1141         sch = to_subchannel(cdev->dev.parent);
1142         /*
1143          * An interrupt in state offline means a previous disable was not
1144          * successful. Try again.
1145          */
1146         cio_disable_subchannel(sch);
1147 }
1148
1149 static void
1150 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1151 {
1152         retry_set_schib(cdev);
1153         cdev->private->state = DEV_STATE_ONLINE;
1154         dev_fsm_event(cdev, dev_event);
1155 }
1156
1157 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1158                                        enum dev_event dev_event)
1159 {
1160         cmf_retry_copy_block(cdev);
1161         cdev->private->state = DEV_STATE_ONLINE;
1162         dev_fsm_event(cdev, dev_event);
1163 }
1164
1165 static void
1166 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1167 {
1168         ccw_device_set_timeout(cdev, 0);
1169         if (dev_event == DEV_EVENT_NOTOPER)
1170                 cdev->private->state = DEV_STATE_NOT_OPER;
1171         else
1172                 cdev->private->state = DEV_STATE_OFFLINE;
1173         wake_up(&cdev->private->wait_q);
1174 }
1175
1176 static void
1177 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1178 {
1179         int ret;
1180
1181         ret = ccw_device_cancel_halt_clear(cdev);
1182         switch (ret) {
1183         case 0:
1184                 cdev->private->state = DEV_STATE_OFFLINE;
1185                 wake_up(&cdev->private->wait_q);
1186                 break;
1187         case -ENODEV:
1188                 cdev->private->state = DEV_STATE_NOT_OPER;
1189                 wake_up(&cdev->private->wait_q);
1190                 break;
1191         default:
1192                 ccw_device_set_timeout(cdev, HZ/10);
1193         }
1194 }
1195
1196 /*
1197  * No operation action. This is used e.g. to ignore a timeout event in
1198  * state offline.
1199  */
1200 static void
1201 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1202 {
1203 }
1204
1205 /*
1206  * Bug operation action.
1207  */
1208 static void
1209 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1210 {
1211         printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
1212                cdev->private->state, dev_event);
1213         BUG();
1214 }
1215
1216 /*
1217  * device statemachine
1218  */
1219 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1220         [DEV_STATE_NOT_OPER] = {
1221                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1222                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1223                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1224                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1225         },
1226         [DEV_STATE_SENSE_PGID] = {
1227                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1228                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1229                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1230                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1231         },
1232         [DEV_STATE_SENSE_ID] = {
1233                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1234                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1235                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1236                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1237         },
1238         [DEV_STATE_OFFLINE] = {
1239                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1240                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1241                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1242                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1243         },
1244         [DEV_STATE_VERIFY] = {
1245                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1246                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1247                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1248                 [DEV_EVENT_VERIFY]      = ccw_device_delay_verify,
1249         },
1250         [DEV_STATE_ONLINE] = {
1251                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1252                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1253                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1254                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1255         },
1256         [DEV_STATE_W4SENSE] = {
1257                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1258                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1259                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1260                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1261         },
1262         [DEV_STATE_DISBAND_PGID] = {
1263                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1264                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1265                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1266                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1267         },
1268         [DEV_STATE_BOXED] = {
1269                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1270                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1271                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1272                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1273         },
1274         /* states to wait for i/o completion before doing something */
1275         [DEV_STATE_CLEAR_VERIFY] = {
1276                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1277                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1278                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1279                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1280         },
1281         [DEV_STATE_TIMEOUT_KILL] = {
1282                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1283                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1284                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1285                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1286         },
1287         [DEV_STATE_WAIT4IO] = {
1288                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1289                 [DEV_EVENT_INTERRUPT]   = ccw_device_wait4io_irq,
1290                 [DEV_EVENT_TIMEOUT]     = ccw_device_wait4io_timeout,
1291                 [DEV_EVENT_VERIFY]      = ccw_device_delay_verify,
1292         },
1293         [DEV_STATE_QUIESCE] = {
1294                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1295                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1296                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1297                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1298         },
1299         /* special states for devices gone not operational */
1300         [DEV_STATE_DISCONNECTED] = {
1301                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1302                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1303                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1304                 [DEV_EVENT_VERIFY]      = ccw_device_start_id,
1305         },
1306         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1307                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1308                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1309                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1310                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1311         },
1312         [DEV_STATE_CMFCHANGE] = {
1313                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1314                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1315                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1316                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1317         },
1318         [DEV_STATE_CMFUPDATE] = {
1319                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1320                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1321                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1322                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1323         },
1324 };
1325
1326 /*
1327  * io_subchannel_irq is called for "real" interrupts or for status
1328  * pending conditions on msch.
1329  */
1330 void
1331 io_subchannel_irq (struct device *pdev)
1332 {
1333         struct ccw_device *cdev;
1334
1335         cdev = to_subchannel(pdev)->dev.driver_data;
1336
1337         CIO_TRACE_EVENT (3, "IRQ");
1338         CIO_TRACE_EVENT (3, pdev->bus_id);
1339         if (cdev)
1340                 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1341 }
1342
1343 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);