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.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.cu_type   = cdev->private->senseid.cu_type;
 271                 cdev->id.cu_model  = cdev->private->senseid.cu_model;
 272                 cdev->id.dev_type  = cdev->private->senseid.dev_type;
 273                 cdev->id.dev_model = cdev->private->senseid.dev_model;
 274                 if (notify) {
 275                         cdev->private->state = DEV_STATE_OFFLINE;
 276                         if (same_dev) {
 277                                 /* Get device online again. */
 278                                 ccw_device_online(cdev);
 279                                 wake_up(&cdev->private->wait_q);
 280                         }
 281                         return;
 282                 }
 283                 /* Issue device info message. */
 284                 CIO_DEBUG(KERN_INFO, 2, "SenseID : device 0.%x.%04x reports: "
 285                           "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
 286                           "%04X/%02X\n",
 287                           cdev->private->ssid, cdev->private->devno,
 288                           cdev->id.cu_type, cdev->id.cu_model,
 289                           cdev->id.dev_type, cdev->id.dev_model);
 290                 break;
 291         case DEV_STATE_BOXED:
 292                 CIO_DEBUG(KERN_WARNING, 2,
 293                           "SenseID : boxed device %04x on subchannel "
 294                           "0.%x.%04x\n", cdev->private->devno,
 295                           sch->schid.ssid, sch->schid.sch_no);
 296                 break;
 297         }
 298         cdev->private->state = state;
 299         io_subchannel_recog_done(cdev);
 300         if (state != DEV_STATE_NOT_OPER)
 301                 wake_up(&cdev->private->wait_q);
 302 }
 303
 304 /*
 305  * Function called from device_id.c after sense id has completed.
 306  */
 307 void
 308 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
 309 {
 310         switch (err) {
 311         case 0:
 312                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
 313                 break;
 314         case -ETIME:            /* Sense id stopped by timeout. */
 315                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 316                 break;
 317         default:
 318                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 319                 break;
 320         }
 321 }
 322
 323 static void
 324 ccw_device_oper_notify(void *data)
 325 {
 326         struct ccw_device *cdev;
 327         struct subchannel *sch;
 328         int ret;
 329
 330         cdev = (struct ccw_device *)data;
 331         sch = to_subchannel(cdev->dev.parent);
 332         ret = (sch->driver && sch->driver->notify) ?
 333                 sch->driver->notify(&sch->dev, CIO_OPER) : 0;
 334         if (!ret)
 335                 /* Driver doesn't want device back. */
 336                 ccw_device_do_unreg_rereg((void *)cdev);
 337         else {
 338                 /* Reenable channel measurements, if needed. */
 339                 cmf_reenable(cdev);
 340                 wake_up(&cdev->private->wait_q);
 341         }
 342 }
 343
 344 /*
 345  * Finished with online/offline processing.
 346  */
 347 static void
 348 ccw_device_done(struct ccw_device *cdev, int state)
 349 {
 350         struct subchannel *sch;
 351
 352         sch = to_subchannel(cdev->dev.parent);
 353
 354         if (state != DEV_STATE_ONLINE)
 355                 cio_disable_subchannel(sch);
 356
 357         /* Reset device status. */
 358         memset(&cdev->private->irb, 0, sizeof(struct irb));
 359
 360         cdev->private->state = state;
 361
 362
 363         if (state == DEV_STATE_BOXED)
 364                 CIO_DEBUG(KERN_WARNING, 2,
 365                           "Boxed device %04x on subchannel %04x\n",
 366                           cdev->private->devno, sch->schid.sch_no);
 367
 368         if (cdev->private->flags.donotify) {
 369                 cdev->private->flags.donotify = 0;
 370                 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify,
 371                              (void *)cdev);
 372                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 373         }
 374         wake_up(&cdev->private->wait_q);
 375
 376         if (css_init_done && state != DEV_STATE_ONLINE)
 377                 put_device (&cdev->dev);
 378 }
 379
 380 static inline int cmp_pgid(struct pgid *p1, struct pgid *p2)
 381 {
 382         char *c1;
 383         char *c2;
 384
 385         c1 = (char *)p1;
 386         c2 = (char *)p2;
 387
 388         return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
 389 }
 390
 391 static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
 392 {
 393         int i;
 394         int last;
 395
 396         last = 0;
 397         for (i = 0; i < 8; i++) {
 398                 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
 399                         /* No PGID yet */
 400                         continue;
 401                 if (cdev->private->pgid[last].inf.ps.state1 ==
 402                     SNID_STATE1_RESET) {
 403                         /* First non-zero PGID */
 404                         last = i;
 405                         continue;
 406                 }
 407                 if (cmp_pgid(&cdev->private->pgid[i],
 408                              &cdev->private->pgid[last]) == 0)
 409                         /* Non-conflicting PGIDs */
 410                         continue;
 411
 412                 /* PGID mismatch, can't pathgroup. */
 413                 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
 414                               "0.%x.%04x, can't pathgroup\n",
 415                               cdev->private->ssid, cdev->private->devno);
 416                 cdev->private->options.pgroup = 0;
 417                 return;
 418         }
 419         if (cdev->private->pgid[last].inf.ps.state1 ==
 420             SNID_STATE1_RESET)
 421                 /* No previous pgid found */
 422                 memcpy(&cdev->private->pgid[0], &css[0]->global_pgid,
 423                        sizeof(struct pgid));
 424         else
 425                 /* Use existing pgid */
 426                 memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
 427                        sizeof(struct pgid));
 428 }
 429
 430 /*
 431  * Function called from device_pgid.c after sense path ground has completed.
 432  */
 433 void
 434 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
 435 {
 436         struct subchannel *sch;
 437
 438         sch = to_subchannel(cdev->dev.parent);
 439         switch (err) {
 440         case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
 441                 cdev->private->options.pgroup = 0;
 442                 break;
 443         case 0: /* success */
 444         case -EACCES: /* partial success, some paths not operational */
 445                 /* Check if all pgids are equal or 0. */
 446                 __ccw_device_get_common_pgid(cdev);
 447                 break;
 448         case -ETIME:            /* Sense path group id stopped by timeout. */
 449         case -EUSERS:           /* device is reserved for someone else. */
 450                 ccw_device_done(cdev, DEV_STATE_BOXED);
 451                 return;
 452         default:
 453                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 454                 return;
 455         }
 456         /* Start Path Group verification. */
 457         sch->vpm = 0;   /* Start with no path groups set. */
 458         cdev->private->state = DEV_STATE_VERIFY;
 459         ccw_device_verify_start(cdev);
 460 }
 461
 462 /*
 463  * Start device recognition.
 464  */
 465 int
 466 ccw_device_recognition(struct ccw_device *cdev)
 467 {
 468         struct subchannel *sch;
 469         int ret;
 470
 471         if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
 472             (cdev->private->state != DEV_STATE_BOXED))
 473                 return -EINVAL;
 474         sch = to_subchannel(cdev->dev.parent);
 475         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 476         if (ret != 0)
 477                 /* Couldn't enable the subchannel for i/o. Sick device. */
 478                 return ret;
 479
 480         /* After 60s the device recognition is considered to have failed. */
 481         ccw_device_set_timeout(cdev, 60*HZ);
 482
 483         /*
 484          * We used to start here with a sense pgid to find out whether a device
 485          * is locked by someone else. Unfortunately, the sense pgid command
 486          * code has other meanings on devices predating the path grouping
 487          * algorithm, so we start with sense id and box the device after an
 488          * timeout (or if sense pgid during path verification detects the device
 489          * is locked, as may happen on newer devices).
 490          */
 491         cdev->private->flags.recog_done = 0;
 492         cdev->private->state = DEV_STATE_SENSE_ID;
 493         ccw_device_sense_id_start(cdev);
 494         return 0;
 495 }
 496
 497 /*
 498  * Handle timeout in device recognition.
 499  */
 500 static void
 501 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 502 {
 503         int ret;
 504
 505         ret = ccw_device_cancel_halt_clear(cdev);
 506         switch (ret) {
 507         case 0:
 508                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 509                 break;
 510         case -ENODEV:
 511                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 512                 break;
 513         default:
 514                 ccw_device_set_timeout(cdev, 3*HZ);
 515         }
 516 }
 517
 518
 519 static void
 520 ccw_device_nopath_notify(void *data)
 521 {
 522         struct ccw_device *cdev;
 523         struct subchannel *sch;
 524         int ret;
 525
 526         cdev = (struct ccw_device *)data;
 527         sch = to_subchannel(cdev->dev.parent);
 528         /* Extra sanity. */
 529         if (sch->lpm)
 530                 return;
 531         ret = (sch->driver && sch->driver->notify) ?
 532                 sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0;
 533         if (!ret) {
 534                 if (get_device(&sch->dev)) {
 535                         /* Driver doesn't want to keep device. */
 536                         cio_disable_subchannel(sch);
 537                         if (get_device(&cdev->dev)) {
 538                                 PREPARE_WORK(&cdev->private->kick_work,
 539                                              ccw_device_call_sch_unregister,
 540                                              (void *)cdev);
 541                                 queue_work(ccw_device_work,
 542                                            &cdev->private->kick_work);
 543                         } else
 544                                 put_device(&sch->dev);
 545                 }
 546         } else {
 547                 cio_disable_subchannel(sch);
 548                 ccw_device_set_timeout(cdev, 0);
 549                 cdev->private->flags.fake_irb = 0;
 550                 cdev->private->state = DEV_STATE_DISCONNECTED;
 551                 wake_up(&cdev->private->wait_q);
 552         }
 553 }
 554
 555 void
 556 ccw_device_verify_done(struct ccw_device *cdev, int err)
 557 {
 558         cdev->private->flags.doverify = 0;
 559         switch (err) {
 560         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 561                 cdev->private->options.pgroup = 0;
 562         case 0:
 563                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 564                 /* Deliver fake irb to device driver, if needed. */
 565                 if (cdev->private->flags.fake_irb) {
 566                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 567                         cdev->private->irb.scsw.cc = 1;
 568                         cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC;
 569                         cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND;
 570                         cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND;
 571                         cdev->private->flags.fake_irb = 0;
 572                         if (cdev->handler)
 573                                 cdev->handler(cdev, cdev->private->intparm,
 574                                               &cdev->private->irb);
 575                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 576                 }
 577                 break;
 578         case -ETIME:
 579                 ccw_device_done(cdev, DEV_STATE_BOXED);
 580                 break;
 581         default:
 582                 PREPARE_WORK(&cdev->private->kick_work,
 583                              ccw_device_nopath_notify, (void *)cdev);
 584                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 585                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 586                 break;
 587         }
 588 }
 589
 590 /*
 591  * Get device online.
 592  */
 593 int
 594 ccw_device_online(struct ccw_device *cdev)
 595 {
 596         struct subchannel *sch;
 597         int ret;
 598
 599         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 600             (cdev->private->state != DEV_STATE_BOXED))
 601                 return -EINVAL;
 602         sch = to_subchannel(cdev->dev.parent);
 603         if (css_init_done && !get_device(&cdev->dev))
 604                 return -ENODEV;
 605         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 606         if (ret != 0) {
 607                 /* Couldn't enable the subchannel for i/o. Sick device. */
 608                 if (ret == -ENODEV)
 609                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 610                 return ret;
 611         }
 612         /* Do we want to do path grouping? */
 613         if (!cdev->private->options.pgroup) {
 614                 /* Start initial path verification. */
 615                 cdev->private->state = DEV_STATE_VERIFY;
 616                 ccw_device_verify_start(cdev);
 617                 return 0;
 618         }
 619         /* Do a SensePGID first. */
 620         cdev->private->state = DEV_STATE_SENSE_PGID;
 621         ccw_device_sense_pgid_start(cdev);
 622         return 0;
 623 }
 624
 625 void
 626 ccw_device_disband_done(struct ccw_device *cdev, int err)
 627 {
 628         switch (err) {
 629         case 0:
 630                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 631                 break;
 632         case -ETIME:
 633                 ccw_device_done(cdev, DEV_STATE_BOXED);
 634                 break;
 635         default:
 636                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 637                 break;
 638         }
 639 }
 640
 641 /*
 642  * Shutdown device.
 643  */
 644 int
 645 ccw_device_offline(struct ccw_device *cdev)
 646 {
 647         struct subchannel *sch;
 648
 649         sch = to_subchannel(cdev->dev.parent);
 650         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
 651                 return -ENODEV;
 652         if (cdev->private->state != DEV_STATE_ONLINE) {
 653                 if (sch->schib.scsw.actl != 0)
 654                         return -EBUSY;
 655                 return -EINVAL;
 656         }
 657         if (sch->schib.scsw.actl != 0)
 658                 return -EBUSY;
 659         /* Are we doing path grouping? */
 660         if (!cdev->private->options.pgroup) {
 661                 /* No, set state offline immediately. */
 662                 sch->vpm = 0;
 663                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 664                 return 0;
 665         }
 666         /* Start Set Path Group commands. */
 667         cdev->private->state = DEV_STATE_DISBAND_PGID;
 668         ccw_device_disband_start(cdev);
 669         return 0;
 670 }
 671
 672 /*
 673  * Handle timeout in device online/offline process.
 674  */
 675 static void
 676 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 677 {
 678         int ret;
 679
 680         ret = ccw_device_cancel_halt_clear(cdev);
 681         switch (ret) {
 682         case 0:
 683                 ccw_device_done(cdev, DEV_STATE_BOXED);
 684                 break;
 685         case -ENODEV:
 686                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 687                 break;
 688         default:
 689                 ccw_device_set_timeout(cdev, 3*HZ);
 690         }
 691 }
 692
 693 /*
 694  * Handle not oper event in device recognition.
 695  */
 696 static void
 697 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 698 {
 699         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 700 }
 701
 702 /*
 703  * Handle not operational event while offline.
 704  */
 705 static void
 706 ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 707 {
 708         struct subchannel *sch;
 709
 710         cdev->private->state = DEV_STATE_NOT_OPER;
 711         sch = to_subchannel(cdev->dev.parent);
 712         if (get_device(&cdev->dev)) {
 713                 PREPARE_WORK(&cdev->private->kick_work,
 714                              ccw_device_call_sch_unregister, (void *)cdev);
 715                 queue_work(ccw_device_work, &cdev->private->kick_work);
 716         }
 717         wake_up(&cdev->private->wait_q);
 718 }
 719
 720 /*
 721  * Handle not operational event while online.
 722  */
 723 static void
 724 ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 725 {
 726         struct subchannel *sch;
 727
 728         sch = to_subchannel(cdev->dev.parent);
 729         if (sch->driver->notify &&
 730             sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) {
 731                         ccw_device_set_timeout(cdev, 0);
 732                         cdev->private->flags.fake_irb = 0;
 733                         cdev->private->state = DEV_STATE_DISCONNECTED;
 734                         wake_up(&cdev->private->wait_q);
 735                         return;
 736         }
 737         cdev->private->state = DEV_STATE_NOT_OPER;
 738         cio_disable_subchannel(sch);
 739         if (sch->schib.scsw.actl != 0) {
 740                 // FIXME: not-oper indication to device driver ?
 741                 ccw_device_call_handler(cdev);
 742         }
 743         if (get_device(&cdev->dev)) {
 744                 PREPARE_WORK(&cdev->private->kick_work,
 745                              ccw_device_call_sch_unregister, (void *)cdev);
 746                 queue_work(ccw_device_work, &cdev->private->kick_work);
 747         }
 748         wake_up(&cdev->private->wait_q);
 749 }
 750
 751 /*
 752  * Handle path verification event.
 753  */
 754 static void
 755 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 756 {
 757         struct subchannel *sch;
 758
 759         if (cdev->private->state == DEV_STATE_W4SENSE) {
 760                 cdev->private->flags.doverify = 1;
 761                 return;
 762         }
 763         sch = to_subchannel(cdev->dev.parent);
 764         /*
 765          * Since we might not just be coming from an interrupt from the
 766          * subchannel we have to update the schib.
 767          */
 768         stsch(sch->schid, &sch->schib);
 769
 770         if (sch->schib.scsw.actl != 0 ||
 771             (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) ||
 772             (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
 773                 /*
 774                  * No final status yet or final status not yet delivered
 775                  * to the device driver. Can't do path verfication now,
 776                  * delay until final status was delivered.
 777                  */
 778                 cdev->private->flags.doverify = 1;
 779                 return;
 780         }
 781         /* Device is idle, we can do the path verification. */
 782         cdev->private->state = DEV_STATE_VERIFY;
 783         ccw_device_verify_start(cdev);
 784 }
 785
 786 /*
 787  * Got an interrupt for a normal io (state online).
 788  */
 789 static void
 790 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 791 {
 792         struct irb *irb;
 793
 794         irb = (struct irb *) __LC_IRB;
 795         /* Check for unsolicited interrupt. */
 796         if ((irb->scsw.stctl ==
 797                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
 798             && (!irb->scsw.cc)) {
 799                 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 800                     !irb->esw.esw0.erw.cons) {
 801                         /* Unit check but no sense data. Need basic sense. */
 802                         if (ccw_device_do_sense(cdev, irb) != 0)
 803                                 goto call_handler_unsol;
 804                         memcpy(&cdev->private->irb, irb, sizeof(struct irb));
 805                         cdev->private->state = DEV_STATE_W4SENSE;
 806                         cdev->private->intparm = 0;
 807                         return;
 808                 }
 809 call_handler_unsol:
 810                 if (cdev->handler)
 811                         cdev->handler (cdev, 0, irb);
 812                 return;
 813         }
 814         /* Accumulate status and find out if a basic sense is needed. */
 815         ccw_device_accumulate_irb(cdev, irb);
 816         if (cdev->private->flags.dosense) {
 817                 if (ccw_device_do_sense(cdev, irb) == 0) {
 818                         cdev->private->state = DEV_STATE_W4SENSE;
 819                 }
 820                 return;
 821         }
 822         /* Call the handler. */
 823         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 824                 /* Start delayed path verification. */
 825                 ccw_device_online_verify(cdev, 0);
 826 }
 827
 828 /*
 829  * Got an timeout in online state.
 830  */
 831 static void
 832 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 833 {
 834         int ret;
 835
 836         ccw_device_set_timeout(cdev, 0);
 837         ret = ccw_device_cancel_halt_clear(cdev);
 838         if (ret == -EBUSY) {
 839                 ccw_device_set_timeout(cdev, 3*HZ);
 840                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 841                 return;
 842         }
 843         if (ret == -ENODEV) {
 844                 struct subchannel *sch;
 845
 846                 sch = to_subchannel(cdev->dev.parent);
 847                 if (!sch->lpm) {
 848                         PREPARE_WORK(&cdev->private->kick_work,
 849                                      ccw_device_nopath_notify, (void *)cdev);
 850                         queue_work(ccw_device_notify_work,
 851                                    &cdev->private->kick_work);
 852                 } else
 853                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 854         } else if (cdev->handler)
 855                 cdev->handler(cdev, cdev->private->intparm,
 856                               ERR_PTR(-ETIMEDOUT));
 857 }
 858
 859 /*
 860  * Got an interrupt for a basic sense.
 861  */
 862 void
 863 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 864 {
 865         struct irb *irb;
 866
 867         irb = (struct irb *) __LC_IRB;
 868         /* Check for unsolicited interrupt. */
 869         if (irb->scsw.stctl ==
 870                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 871                 if (irb->scsw.cc == 1)
 872                         /* Basic sense hasn't started. Try again. */
 873                         ccw_device_do_sense(cdev, irb);
 874                 else {
 875                         printk("Huh? %s(%s): unsolicited interrupt...\n",
 876                                __FUNCTION__, cdev->dev.bus_id);
 877                         if (cdev->handler)
 878                                 cdev->handler (cdev, 0, irb);
 879                 }
 880                 return;
 881         }
 882         /*
 883          * Check if a halt or clear has been issued in the meanwhile. If yes,
 884          * only deliver the halt/clear interrupt to the device driver as if it
 885          * had killed the original request.
 886          */
 887         if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
 888                 cdev->private->flags.dosense = 0;
 889                 memset(&cdev->private->irb, 0, sizeof(struct irb));
 890                 ccw_device_accumulate_irb(cdev, irb);
 891                 goto call_handler;
 892         }
 893         /* Add basic sense info to irb. */
 894         ccw_device_accumulate_basic_sense(cdev, irb);
 895         if (cdev->private->flags.dosense) {
 896                 /* Another basic sense is needed. */
 897                 ccw_device_do_sense(cdev, irb);
 898                 return;
 899         }
 900 call_handler:
 901         cdev->private->state = DEV_STATE_ONLINE;
 902         /* Call the handler. */
 903         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 904                 /* Start delayed path verification. */
 905                 ccw_device_online_verify(cdev, 0);
 906 }
 907
 908 static void
 909 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 910 {
 911         struct irb *irb;
 912
 913         irb = (struct irb *) __LC_IRB;
 914         /* Accumulate status. We don't do basic sense. */
 915         ccw_device_accumulate_irb(cdev, irb);
 916         /* Remember to clear irb to avoid residuals. */
 917         memset(&cdev->private->irb, 0, sizeof(struct irb));
 918         /* Try to start delayed device verification. */
 919         ccw_device_online_verify(cdev, 0);
 920         /* Note: Don't call handler for cio initiated clear! */
 921 }
 922
 923 static void
 924 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
 925 {
 926         struct subchannel *sch;
 927
 928         sch = to_subchannel(cdev->dev.parent);
 929         ccw_device_set_timeout(cdev, 0);
 930         /* OK, i/o is dead now. Call interrupt handler. */
 931         cdev->private->state = DEV_STATE_ONLINE;
 932         if (cdev->handler)
 933                 cdev->handler(cdev, cdev->private->intparm,
 934                               ERR_PTR(-ETIMEDOUT));
 935         if (!sch->lpm) {
 936                 PREPARE_WORK(&cdev->private->kick_work,
 937                              ccw_device_nopath_notify, (void *)cdev);
 938                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 939         } else if (cdev->private->flags.doverify)
 940                 /* Start delayed path verification. */
 941                 ccw_device_online_verify(cdev, 0);
 942 }
 943
 944 static void
 945 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 946 {
 947         int ret;
 948
 949         ret = ccw_device_cancel_halt_clear(cdev);
 950         if (ret == -EBUSY) {
 951                 ccw_device_set_timeout(cdev, 3*HZ);
 952                 return;
 953         }
 954         if (ret == -ENODEV) {
 955                 struct subchannel *sch;
 956
 957                 sch = to_subchannel(cdev->dev.parent);
 958                 if (!sch->lpm) {
 959                         PREPARE_WORK(&cdev->private->kick_work,
 960                                      ccw_device_nopath_notify, (void *)cdev);
 961                         queue_work(ccw_device_notify_work,
 962                                    &cdev->private->kick_work);
 963                 } else
 964                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 965                 return;
 966         }
 967         //FIXME: Can we get here?
 968         cdev->private->state = DEV_STATE_ONLINE;
 969         if (cdev->handler)
 970                 cdev->handler(cdev, cdev->private->intparm,
 971                               ERR_PTR(-ETIMEDOUT));
 972 }
 973
 974 static void
 975 ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event)
 976 {
 977         struct irb *irb;
 978         struct subchannel *sch;
 979
 980         irb = (struct irb *) __LC_IRB;
 981         /*
 982          * Accumulate status and find out if a basic sense is needed.
 983          * This is fine since we have already adapted the lpm.
 984          */
 985         ccw_device_accumulate_irb(cdev, irb);
 986         if (cdev->private->flags.dosense) {
 987                 if (ccw_device_do_sense(cdev, irb) == 0) {
 988                         cdev->private->state = DEV_STATE_W4SENSE;
 989                 }
 990                 return;
 991         }
 992
 993         /* Iff device is idle, reset timeout. */
 994         sch = to_subchannel(cdev->dev.parent);
 995         if (!stsch(sch->schid, &sch->schib))
 996                 if (sch->schib.scsw.actl == 0)
 997                         ccw_device_set_timeout(cdev, 0);
 998         /* Call the handler. */
 999         ccw_device_call_handler(cdev);
1000         if (!sch->lpm) {
1001                 PREPARE_WORK(&cdev->private->kick_work,
1002                              ccw_device_nopath_notify, (void *)cdev);
1003                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
1004         } else if (cdev->private->flags.doverify)
1005                 ccw_device_online_verify(cdev, 0);
1006 }
1007
1008 static void
1009 ccw_device_wait4io_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1010 {
1011         int ret;
1012         struct subchannel *sch;
1013
1014         sch = to_subchannel(cdev->dev.parent);
1015         ccw_device_set_timeout(cdev, 0);
1016         ret = ccw_device_cancel_halt_clear(cdev);
1017         if (ret == -EBUSY) {
1018                 ccw_device_set_timeout(cdev, 3*HZ);
1019                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
1020                 return;
1021         }
1022         if (ret == -ENODEV) {
1023                 if (!sch->lpm) {
1024                         PREPARE_WORK(&cdev->private->kick_work,
1025                                      ccw_device_nopath_notify, (void *)cdev);
1026                         queue_work(ccw_device_notify_work,
1027                                    &cdev->private->kick_work);
1028                 } else
1029                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1030                 return;
1031         }
1032         if (cdev->handler)
1033                 cdev->handler(cdev, cdev->private->intparm,
1034                               ERR_PTR(-ETIMEDOUT));
1035         if (!sch->lpm) {
1036                 PREPARE_WORK(&cdev->private->kick_work,
1037                              ccw_device_nopath_notify, (void *)cdev);
1038                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
1039         } else if (cdev->private->flags.doverify)
1040                 /* Start delayed path verification. */
1041                 ccw_device_online_verify(cdev, 0);
1042 }
1043
1044 static void
1045 ccw_device_wait4io_verify(struct ccw_device *cdev, enum dev_event dev_event)
1046 {
1047         /* When the I/O has terminated, we have to start verification. */
1048         cdev->private->flags.doverify = 1;
1049 }
1050
1051 static void
1052 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1053 {
1054         struct irb *irb;
1055
1056         switch (dev_event) {
1057         case DEV_EVENT_INTERRUPT:
1058                 irb = (struct irb *) __LC_IRB;
1059                 /* Check for unsolicited interrupt. */
1060                 if ((irb->scsw.stctl ==
1061                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1062                     (!irb->scsw.cc))
1063                         /* FIXME: we should restart stlck here, but this
1064                          * is extremely unlikely ... */
1065                         goto out_wakeup;
1066
1067                 ccw_device_accumulate_irb(cdev, irb);
1068                 /* We don't care about basic sense etc. */
1069                 break;
1070         default: /* timeout */
1071                 break;
1072         }
1073 out_wakeup:
1074         wake_up(&cdev->private->wait_q);
1075 }
1076
1077 static void
1078 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1079 {
1080         struct subchannel *sch;
1081
1082         sch = to_subchannel(cdev->dev.parent);
1083         if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1084                 /* Couldn't enable the subchannel for i/o. Sick device. */
1085                 return;
1086
1087         /* After 60s the device recognition is considered to have failed. */
1088         ccw_device_set_timeout(cdev, 60*HZ);
1089
1090         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1091         ccw_device_sense_id_start(cdev);
1092 }
1093
1094 void
1095 device_trigger_reprobe(struct subchannel *sch)
1096 {
1097         struct ccw_device *cdev;
1098
1099         if (!sch->dev.driver_data)
1100                 return;
1101         cdev = sch->dev.driver_data;
1102         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1103                 return;
1104
1105         /* Update some values. */
1106         if (stsch(sch->schid, &sch->schib))
1107                 return;
1108
1109         /*
1110          * The pim, pam, pom values may not be accurate, but they are the best
1111          * we have before performing device selection :/
1112          */
1113         sch->lpm = sch->schib.pmcw.pim &
1114                 sch->schib.pmcw.pam &
1115                 sch->schib.pmcw.pom &
1116                 sch->opm;
1117         /* Re-set some bits in the pmcw that were lost. */
1118         sch->schib.pmcw.isc = 3;
1119         sch->schib.pmcw.csense = 1;
1120         sch->schib.pmcw.ena = 0;
1121         if ((sch->lpm & (sch->lpm - 1)) != 0)
1122                 sch->schib.pmcw.mp = 1;
1123         sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1124         /* We should also udate ssd info, but this has to wait. */
1125         ccw_device_start_id(cdev, 0);
1126 }
1127
1128 static void
1129 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1130 {
1131         struct subchannel *sch;
1132
1133         sch = to_subchannel(cdev->dev.parent);
1134         /*
1135          * An interrupt in state offline means a previous disable was not
1136          * successful. Try again.
1137          */
1138         cio_disable_subchannel(sch);
1139 }
1140
1141 static void
1142 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1143 {
1144         retry_set_schib(cdev);
1145         cdev->private->state = DEV_STATE_ONLINE;
1146         dev_fsm_event(cdev, dev_event);
1147 }
1148
1149 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1150                                        enum dev_event dev_event)
1151 {
1152         cmf_retry_copy_block(cdev);
1153         cdev->private->state = DEV_STATE_ONLINE;
1154         dev_fsm_event(cdev, dev_event);
1155 }
1156
1157 static void
1158 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1159 {
1160         ccw_device_set_timeout(cdev, 0);
1161         if (dev_event == DEV_EVENT_NOTOPER)
1162                 cdev->private->state = DEV_STATE_NOT_OPER;
1163         else
1164                 cdev->private->state = DEV_STATE_OFFLINE;
1165         wake_up(&cdev->private->wait_q);
1166 }
1167
1168 static void
1169 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1170 {
1171         int ret;
1172
1173         ret = ccw_device_cancel_halt_clear(cdev);
1174         switch (ret) {
1175         case 0:
1176                 cdev->private->state = DEV_STATE_OFFLINE;
1177                 wake_up(&cdev->private->wait_q);
1178                 break;
1179         case -ENODEV:
1180                 cdev->private->state = DEV_STATE_NOT_OPER;
1181                 wake_up(&cdev->private->wait_q);
1182                 break;
1183         default:
1184                 ccw_device_set_timeout(cdev, HZ/10);
1185         }
1186 }
1187
1188 /*
1189  * No operation action. This is used e.g. to ignore a timeout event in
1190  * state offline.
1191  */
1192 static void
1193 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1194 {
1195 }
1196
1197 /*
1198  * Bug operation action.
1199  */
1200 static void
1201 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1202 {
1203         printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
1204                cdev->private->state, dev_event);
1205         BUG();
1206 }
1207
1208 /*
1209  * device statemachine
1210  */
1211 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1212         [DEV_STATE_NOT_OPER] = {
1213                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1214                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1215                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1216                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1217         },
1218         [DEV_STATE_SENSE_PGID] = {
1219                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1220                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1221                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1222                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1223         },
1224         [DEV_STATE_SENSE_ID] = {
1225                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1226                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1227                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1228                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1229         },
1230         [DEV_STATE_OFFLINE] = {
1231                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1232                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1233                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1234                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1235         },
1236         [DEV_STATE_VERIFY] = {
1237                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1238                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1239                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1240                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1241         },
1242         [DEV_STATE_ONLINE] = {
1243                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1244                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1245                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1246                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1247         },
1248         [DEV_STATE_W4SENSE] = {
1249                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1250                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1251                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1252                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1253         },
1254         [DEV_STATE_DISBAND_PGID] = {
1255                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1256                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1257                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1258                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1259         },
1260         [DEV_STATE_BOXED] = {
1261                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1262                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1263                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1264                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1265         },
1266         /* states to wait for i/o completion before doing something */
1267         [DEV_STATE_CLEAR_VERIFY] = {
1268                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1269                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1270                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1271                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1272         },
1273         [DEV_STATE_TIMEOUT_KILL] = {
1274                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1275                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1276                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1277                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1278         },
1279         [DEV_STATE_WAIT4IO] = {
1280                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1281                 [DEV_EVENT_INTERRUPT]   = ccw_device_wait4io_irq,
1282                 [DEV_EVENT_TIMEOUT]     = ccw_device_wait4io_timeout,
1283                 [DEV_EVENT_VERIFY]      = ccw_device_wait4io_verify,
1284         },
1285         [DEV_STATE_QUIESCE] = {
1286                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1287                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1288                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1289                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1290         },
1291         /* special states for devices gone not operational */
1292         [DEV_STATE_DISCONNECTED] = {
1293                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1294                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1295                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1296                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1297         },
1298         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1299                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1300                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1301                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1302                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1303         },
1304         [DEV_STATE_CMFCHANGE] = {
1305                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1306                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1307                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1308                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1309         },
1310         [DEV_STATE_CMFUPDATE] = {
1311                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1312                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1313                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1314                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1315         },
1316 };
1317
1318 /*
1319  * io_subchannel_irq is called for "real" interrupts or for status
1320  * pending conditions on msch.
1321  */
1322 void
1323 io_subchannel_irq (struct device *pdev)
1324 {
1325         struct ccw_device *cdev;
1326
1327         cdev = to_subchannel(pdev)->dev.driver_data;
1328
1329         CIO_TRACE_EVENT (3, "IRQ");
1330         CIO_TRACE_EVENT (3, pdev->bus_id);
1331         if (cdev)
1332                 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1333 }
1334
1335 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);