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   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         ccw_device_set_timeout(cdev, 0);
 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         cdev->private->state = DEV_STATE_VERIFY;
 458         cdev->private->flags.doverify = 0;
 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         struct subchannel *sch;
 559
 560         sch = to_subchannel(cdev->dev.parent);
 561         /* Update schib - pom may have changed. */
 562         stsch(sch->schid, &sch->schib);
 563         /* Update lpm with verified path mask. */
 564         sch->lpm = sch->vpm;
 565         /* Repeat path verification? */
 566         if (cdev->private->flags.doverify) {
 567                 cdev->private->flags.doverify = 0;
 568                 ccw_device_verify_start(cdev);
 569                 return;
 570         }
 571         switch (err) {
 572         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 573                 cdev->private->options.pgroup = 0;
 574         case 0:
 575                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 576                 /* Deliver fake irb to device driver, if needed. */
 577                 if (cdev->private->flags.fake_irb) {
 578                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 579                         cdev->private->irb.scsw.cc = 1;
 580                         cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC;
 581                         cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND;
 582                         cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND;
 583                         cdev->private->flags.fake_irb = 0;
 584                         if (cdev->handler)
 585                                 cdev->handler(cdev, cdev->private->intparm,
 586                                               &cdev->private->irb);
 587                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 588                 }
 589                 break;
 590         case -ETIME:
 591                 ccw_device_done(cdev, DEV_STATE_BOXED);
 592                 break;
 593         default:
 594                 PREPARE_WORK(&cdev->private->kick_work,
 595                              ccw_device_nopath_notify, (void *)cdev);
 596                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 597                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 598                 break;
 599         }
 600 }
 601
 602 /*
 603  * Get device online.
 604  */
 605 int
 606 ccw_device_online(struct ccw_device *cdev)
 607 {
 608         struct subchannel *sch;
 609         int ret;
 610
 611         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 612             (cdev->private->state != DEV_STATE_BOXED))
 613                 return -EINVAL;
 614         sch = to_subchannel(cdev->dev.parent);
 615         if (css_init_done && !get_device(&cdev->dev))
 616                 return -ENODEV;
 617         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 618         if (ret != 0) {
 619                 /* Couldn't enable the subchannel for i/o. Sick device. */
 620                 if (ret == -ENODEV)
 621                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 622                 return ret;
 623         }
 624         /* Do we want to do path grouping? */
 625         if (!cdev->private->options.pgroup) {
 626                 /* Start initial path verification. */
 627                 cdev->private->state = DEV_STATE_VERIFY;
 628                 cdev->private->flags.doverify = 0;
 629                 ccw_device_verify_start(cdev);
 630                 return 0;
 631         }
 632         /* Do a SensePGID first. */
 633         cdev->private->state = DEV_STATE_SENSE_PGID;
 634         ccw_device_sense_pgid_start(cdev);
 635         return 0;
 636 }
 637
 638 void
 639 ccw_device_disband_done(struct ccw_device *cdev, int err)
 640 {
 641         switch (err) {
 642         case 0:
 643                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 644                 break;
 645         case -ETIME:
 646                 ccw_device_done(cdev, DEV_STATE_BOXED);
 647                 break;
 648         default:
 649                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 650                 break;
 651         }
 652 }
 653
 654 /*
 655  * Shutdown device.
 656  */
 657 int
 658 ccw_device_offline(struct ccw_device *cdev)
 659 {
 660         struct subchannel *sch;
 661
 662         sch = to_subchannel(cdev->dev.parent);
 663         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
 664                 return -ENODEV;
 665         if (cdev->private->state != DEV_STATE_ONLINE) {
 666                 if (sch->schib.scsw.actl != 0)
 667                         return -EBUSY;
 668                 return -EINVAL;
 669         }
 670         if (sch->schib.scsw.actl != 0)
 671                 return -EBUSY;
 672         /* Are we doing path grouping? */
 673         if (!cdev->private->options.pgroup) {
 674                 /* No, set state offline immediately. */
 675                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 676                 return 0;
 677         }
 678         /* Start Set Path Group commands. */
 679         cdev->private->state = DEV_STATE_DISBAND_PGID;
 680         ccw_device_disband_start(cdev);
 681         return 0;
 682 }
 683
 684 /*
 685  * Handle timeout in device online/offline process.
 686  */
 687 static void
 688 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 689 {
 690         int ret;
 691
 692         ret = ccw_device_cancel_halt_clear(cdev);
 693         switch (ret) {
 694         case 0:
 695                 ccw_device_done(cdev, DEV_STATE_BOXED);
 696                 break;
 697         case -ENODEV:
 698                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 699                 break;
 700         default:
 701                 ccw_device_set_timeout(cdev, 3*HZ);
 702         }
 703 }
 704
 705 /*
 706  * Handle not oper event in device recognition.
 707  */
 708 static void
 709 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 710 {
 711         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 712 }
 713
 714 /*
 715  * Handle not operational event while offline.
 716  */
 717 static void
 718 ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 719 {
 720         struct subchannel *sch;
 721
 722         cdev->private->state = DEV_STATE_NOT_OPER;
 723         sch = to_subchannel(cdev->dev.parent);
 724         if (get_device(&cdev->dev)) {
 725                 PREPARE_WORK(&cdev->private->kick_work,
 726                              ccw_device_call_sch_unregister, (void *)cdev);
 727                 queue_work(ccw_device_work, &cdev->private->kick_work);
 728         }
 729         wake_up(&cdev->private->wait_q);
 730 }
 731
 732 /*
 733  * Handle not operational event while online.
 734  */
 735 static void
 736 ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 737 {
 738         struct subchannel *sch;
 739
 740         sch = to_subchannel(cdev->dev.parent);
 741         if (sch->driver->notify &&
 742             sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) {
 743                         ccw_device_set_timeout(cdev, 0);
 744                         cdev->private->flags.fake_irb = 0;
 745                         cdev->private->state = DEV_STATE_DISCONNECTED;
 746                         wake_up(&cdev->private->wait_q);
 747                         return;
 748         }
 749         cdev->private->state = DEV_STATE_NOT_OPER;
 750         cio_disable_subchannel(sch);
 751         if (sch->schib.scsw.actl != 0) {
 752                 // FIXME: not-oper indication to device driver ?
 753                 ccw_device_call_handler(cdev);
 754         }
 755         if (get_device(&cdev->dev)) {
 756                 PREPARE_WORK(&cdev->private->kick_work,
 757                              ccw_device_call_sch_unregister, (void *)cdev);
 758                 queue_work(ccw_device_work, &cdev->private->kick_work);
 759         }
 760         wake_up(&cdev->private->wait_q);
 761 }
 762
 763 /*
 764  * Handle path verification event.
 765  */
 766 static void
 767 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 768 {
 769         struct subchannel *sch;
 770
 771         if (cdev->private->state == DEV_STATE_W4SENSE) {
 772                 cdev->private->flags.doverify = 1;
 773                 return;
 774         }
 775         sch = to_subchannel(cdev->dev.parent);
 776         /*
 777          * Since we might not just be coming from an interrupt from the
 778          * subchannel we have to update the schib.
 779          */
 780         stsch(sch->schid, &sch->schib);
 781
 782         if (sch->schib.scsw.actl != 0 ||
 783             (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) ||
 784             (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
 785                 /*
 786                  * No final status yet or final status not yet delivered
 787                  * to the device driver. Can't do path verfication now,
 788                  * delay until final status was delivered.
 789                  */
 790                 cdev->private->flags.doverify = 1;
 791                 return;
 792         }
 793         /* Device is idle, we can do the path verification. */
 794         cdev->private->state = DEV_STATE_VERIFY;
 795         cdev->private->flags.doverify = 0;
 796         ccw_device_verify_start(cdev);
 797 }
 798
 799 /*
 800  * Got an interrupt for a normal io (state online).
 801  */
 802 static void
 803 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 804 {
 805         struct irb *irb;
 806
 807         irb = (struct irb *) __LC_IRB;
 808         /* Check for unsolicited interrupt. */
 809         if ((irb->scsw.stctl ==
 810                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
 811             && (!irb->scsw.cc)) {
 812                 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 813                     !irb->esw.esw0.erw.cons) {
 814                         /* Unit check but no sense data. Need basic sense. */
 815                         if (ccw_device_do_sense(cdev, irb) != 0)
 816                                 goto call_handler_unsol;
 817                         memcpy(&cdev->private->irb, irb, sizeof(struct irb));
 818                         cdev->private->state = DEV_STATE_W4SENSE;
 819                         cdev->private->intparm = 0;
 820                         return;
 821                 }
 822 call_handler_unsol:
 823                 if (cdev->handler)
 824                         cdev->handler (cdev, 0, irb);
 825                 return;
 826         }
 827         /* Accumulate status and find out if a basic sense is needed. */
 828         ccw_device_accumulate_irb(cdev, irb);
 829         if (cdev->private->flags.dosense) {
 830                 if (ccw_device_do_sense(cdev, irb) == 0) {
 831                         cdev->private->state = DEV_STATE_W4SENSE;
 832                 }
 833                 return;
 834         }
 835         /* Call the handler. */
 836         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 837                 /* Start delayed path verification. */
 838                 ccw_device_online_verify(cdev, 0);
 839 }
 840
 841 /*
 842  * Got an timeout in online state.
 843  */
 844 static void
 845 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 846 {
 847         int ret;
 848
 849         ccw_device_set_timeout(cdev, 0);
 850         ret = ccw_device_cancel_halt_clear(cdev);
 851         if (ret == -EBUSY) {
 852                 ccw_device_set_timeout(cdev, 3*HZ);
 853                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 854                 return;
 855         }
 856         if (ret == -ENODEV) {
 857                 struct subchannel *sch;
 858
 859                 sch = to_subchannel(cdev->dev.parent);
 860                 if (!sch->lpm) {
 861                         PREPARE_WORK(&cdev->private->kick_work,
 862                                      ccw_device_nopath_notify, (void *)cdev);
 863                         queue_work(ccw_device_notify_work,
 864                                    &cdev->private->kick_work);
 865                 } else
 866                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 867         } else if (cdev->handler)
 868                 cdev->handler(cdev, cdev->private->intparm,
 869                               ERR_PTR(-ETIMEDOUT));
 870 }
 871
 872 /*
 873  * Got an interrupt for a basic sense.
 874  */
 875 void
 876 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 877 {
 878         struct irb *irb;
 879
 880         irb = (struct irb *) __LC_IRB;
 881         /* Check for unsolicited interrupt. */
 882         if (irb->scsw.stctl ==
 883                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 884                 if (irb->scsw.cc == 1)
 885                         /* Basic sense hasn't started. Try again. */
 886                         ccw_device_do_sense(cdev, irb);
 887                 else {
 888                         printk("Huh? %s(%s): unsolicited interrupt...\n",
 889                                __FUNCTION__, cdev->dev.bus_id);
 890                         if (cdev->handler)
 891                                 cdev->handler (cdev, 0, irb);
 892                 }
 893                 return;
 894         }
 895         /*
 896          * Check if a halt or clear has been issued in the meanwhile. If yes,
 897          * only deliver the halt/clear interrupt to the device driver as if it
 898          * had killed the original request.
 899          */
 900         if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
 901                 cdev->private->flags.dosense = 0;
 902                 memset(&cdev->private->irb, 0, sizeof(struct irb));
 903                 ccw_device_accumulate_irb(cdev, irb);
 904                 goto call_handler;
 905         }
 906         /* Add basic sense info to irb. */
 907         ccw_device_accumulate_basic_sense(cdev, irb);
 908         if (cdev->private->flags.dosense) {
 909                 /* Another basic sense is needed. */
 910                 ccw_device_do_sense(cdev, irb);
 911                 return;
 912         }
 913 call_handler:
 914         cdev->private->state = DEV_STATE_ONLINE;
 915         /* Call the handler. */
 916         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 917                 /* Start delayed path verification. */
 918                 ccw_device_online_verify(cdev, 0);
 919 }
 920
 921 static void
 922 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 923 {
 924         struct irb *irb;
 925
 926         irb = (struct irb *) __LC_IRB;
 927         /* Accumulate status. We don't do basic sense. */
 928         ccw_device_accumulate_irb(cdev, irb);
 929         /* Remember to clear irb to avoid residuals. */
 930         memset(&cdev->private->irb, 0, sizeof(struct irb));
 931         /* Try to start delayed device verification. */
 932         ccw_device_online_verify(cdev, 0);
 933         /* Note: Don't call handler for cio initiated clear! */
 934 }
 935
 936 static void
 937 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
 938 {
 939         struct subchannel *sch;
 940
 941         sch = to_subchannel(cdev->dev.parent);
 942         ccw_device_set_timeout(cdev, 0);
 943         /* OK, i/o is dead now. Call interrupt handler. */
 944         cdev->private->state = DEV_STATE_ONLINE;
 945         if (cdev->handler)
 946                 cdev->handler(cdev, cdev->private->intparm,
 947                               ERR_PTR(-ETIMEDOUT));
 948         if (!sch->lpm) {
 949                 PREPARE_WORK(&cdev->private->kick_work,
 950                              ccw_device_nopath_notify, (void *)cdev);
 951                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 952         } else if (cdev->private->flags.doverify)
 953                 /* Start delayed path verification. */
 954                 ccw_device_online_verify(cdev, 0);
 955 }
 956
 957 static void
 958 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 959 {
 960         int ret;
 961
 962         ret = ccw_device_cancel_halt_clear(cdev);
 963         if (ret == -EBUSY) {
 964                 ccw_device_set_timeout(cdev, 3*HZ);
 965                 return;
 966         }
 967         if (ret == -ENODEV) {
 968                 struct subchannel *sch;
 969
 970                 sch = to_subchannel(cdev->dev.parent);
 971                 if (!sch->lpm) {
 972                         PREPARE_WORK(&cdev->private->kick_work,
 973                                      ccw_device_nopath_notify, (void *)cdev);
 974                         queue_work(ccw_device_notify_work,
 975                                    &cdev->private->kick_work);
 976                 } else
 977                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 978                 return;
 979         }
 980         //FIXME: Can we get here?
 981         cdev->private->state = DEV_STATE_ONLINE;
 982         if (cdev->handler)
 983                 cdev->handler(cdev, cdev->private->intparm,
 984                               ERR_PTR(-ETIMEDOUT));
 985 }
 986
 987 static void
 988 ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event)
 989 {
 990         struct irb *irb;
 991         struct subchannel *sch;
 992
 993         irb = (struct irb *) __LC_IRB;
 994         /*
 995          * Accumulate status and find out if a basic sense is needed.
 996          * This is fine since we have already adapted the lpm.
 997          */
 998         ccw_device_accumulate_irb(cdev, irb);
 999         if (cdev->private->flags.dosense) {
1000                 if (ccw_device_do_sense(cdev, irb) == 0) {
1001                         cdev->private->state = DEV_STATE_W4SENSE;
1002                 }
1003                 return;
1004         }
1005
1006         /* Iff device is idle, reset timeout. */
1007         sch = to_subchannel(cdev->dev.parent);
1008         if (!stsch(sch->schid, &sch->schib))
1009                 if (sch->schib.scsw.actl == 0)
1010                         ccw_device_set_timeout(cdev, 0);
1011         /* Call the handler. */
1012         ccw_device_call_handler(cdev);
1013         if (!sch->lpm) {
1014                 PREPARE_WORK(&cdev->private->kick_work,
1015                              ccw_device_nopath_notify, (void *)cdev);
1016                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
1017         } else if (cdev->private->flags.doverify)
1018                 ccw_device_online_verify(cdev, 0);
1019 }
1020
1021 static void
1022 ccw_device_wait4io_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1023 {
1024         int ret;
1025         struct subchannel *sch;
1026
1027         sch = to_subchannel(cdev->dev.parent);
1028         ccw_device_set_timeout(cdev, 0);
1029         ret = ccw_device_cancel_halt_clear(cdev);
1030         if (ret == -EBUSY) {
1031                 ccw_device_set_timeout(cdev, 3*HZ);
1032                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
1033                 return;
1034         }
1035         if (ret == -ENODEV) {
1036                 if (!sch->lpm) {
1037                         PREPARE_WORK(&cdev->private->kick_work,
1038                                      ccw_device_nopath_notify, (void *)cdev);
1039                         queue_work(ccw_device_notify_work,
1040                                    &cdev->private->kick_work);
1041                 } else
1042                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1043                 return;
1044         }
1045         if (cdev->handler)
1046                 cdev->handler(cdev, cdev->private->intparm,
1047                               ERR_PTR(-ETIMEDOUT));
1048         if (!sch->lpm) {
1049                 PREPARE_WORK(&cdev->private->kick_work,
1050                              ccw_device_nopath_notify, (void *)cdev);
1051                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
1052         } else if (cdev->private->flags.doverify)
1053                 /* Start delayed path verification. */
1054                 ccw_device_online_verify(cdev, 0);
1055 }
1056
1057 static void
1058 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
1059 {
1060         /* Start verification after current task finished. */
1061         cdev->private->flags.doverify = 1;
1062 }
1063
1064 static void
1065 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1066 {
1067         struct irb *irb;
1068
1069         switch (dev_event) {
1070         case DEV_EVENT_INTERRUPT:
1071                 irb = (struct irb *) __LC_IRB;
1072                 /* Check for unsolicited interrupt. */
1073                 if ((irb->scsw.stctl ==
1074                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1075                     (!irb->scsw.cc))
1076                         /* FIXME: we should restart stlck here, but this
1077                          * is extremely unlikely ... */
1078                         goto out_wakeup;
1079
1080                 ccw_device_accumulate_irb(cdev, irb);
1081                 /* We don't care about basic sense etc. */
1082                 break;
1083         default: /* timeout */
1084                 break;
1085         }
1086 out_wakeup:
1087         wake_up(&cdev->private->wait_q);
1088 }
1089
1090 static void
1091 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1092 {
1093         struct subchannel *sch;
1094
1095         sch = to_subchannel(cdev->dev.parent);
1096         if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1097                 /* Couldn't enable the subchannel for i/o. Sick device. */
1098                 return;
1099
1100         /* After 60s the device recognition is considered to have failed. */
1101         ccw_device_set_timeout(cdev, 60*HZ);
1102
1103         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1104         ccw_device_sense_id_start(cdev);
1105 }
1106
1107 void
1108 device_trigger_reprobe(struct subchannel *sch)
1109 {
1110         struct ccw_device *cdev;
1111
1112         if (!sch->dev.driver_data)
1113                 return;
1114         cdev = sch->dev.driver_data;
1115         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1116                 return;
1117
1118         /* Update some values. */
1119         if (stsch(sch->schid, &sch->schib))
1120                 return;
1121
1122         /*
1123          * The pim, pam, pom values may not be accurate, but they are the best
1124          * we have before performing device selection :/
1125          */
1126         sch->lpm = sch->schib.pmcw.pam & sch->opm;
1127         /* Re-set some bits in the pmcw that were lost. */
1128         sch->schib.pmcw.isc = 3;
1129         sch->schib.pmcw.csense = 1;
1130         sch->schib.pmcw.ena = 0;
1131         if ((sch->lpm & (sch->lpm - 1)) != 0)
1132                 sch->schib.pmcw.mp = 1;
1133         sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1134         /* We should also udate ssd info, but this has to wait. */
1135         ccw_device_start_id(cdev, 0);
1136 }
1137
1138 static void
1139 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1140 {
1141         struct subchannel *sch;
1142
1143         sch = to_subchannel(cdev->dev.parent);
1144         /*
1145          * An interrupt in state offline means a previous disable was not
1146          * successful. Try again.
1147          */
1148         cio_disable_subchannel(sch);
1149 }
1150
1151 static void
1152 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1153 {
1154         retry_set_schib(cdev);
1155         cdev->private->state = DEV_STATE_ONLINE;
1156         dev_fsm_event(cdev, dev_event);
1157 }
1158
1159 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1160                                        enum dev_event dev_event)
1161 {
1162         cmf_retry_copy_block(cdev);
1163         cdev->private->state = DEV_STATE_ONLINE;
1164         dev_fsm_event(cdev, dev_event);
1165 }
1166
1167 static void
1168 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1169 {
1170         ccw_device_set_timeout(cdev, 0);
1171         if (dev_event == DEV_EVENT_NOTOPER)
1172                 cdev->private->state = DEV_STATE_NOT_OPER;
1173         else
1174                 cdev->private->state = DEV_STATE_OFFLINE;
1175         wake_up(&cdev->private->wait_q);
1176 }
1177
1178 static void
1179 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1180 {
1181         int ret;
1182
1183         ret = ccw_device_cancel_halt_clear(cdev);
1184         switch (ret) {
1185         case 0:
1186                 cdev->private->state = DEV_STATE_OFFLINE;
1187                 wake_up(&cdev->private->wait_q);
1188                 break;
1189         case -ENODEV:
1190                 cdev->private->state = DEV_STATE_NOT_OPER;
1191                 wake_up(&cdev->private->wait_q);
1192                 break;
1193         default:
1194                 ccw_device_set_timeout(cdev, HZ/10);
1195         }
1196 }
1197
1198 /*
1199  * No operation action. This is used e.g. to ignore a timeout event in
1200  * state offline.
1201  */
1202 static void
1203 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1204 {
1205 }
1206
1207 /*
1208  * Bug operation action.
1209  */
1210 static void
1211 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1212 {
1213         printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
1214                cdev->private->state, dev_event);
1215         BUG();
1216 }
1217
1218 /*
1219  * device statemachine
1220  */
1221 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1222         [DEV_STATE_NOT_OPER] = {
1223                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1224                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1225                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1226                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1227         },
1228         [DEV_STATE_SENSE_PGID] = {
1229                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1230                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1231                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1232                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1233         },
1234         [DEV_STATE_SENSE_ID] = {
1235                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1236                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1237                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1238                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1239         },
1240         [DEV_STATE_OFFLINE] = {
1241                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1242                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1243                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1244                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1245         },
1246         [DEV_STATE_VERIFY] = {
1247                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1248                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1249                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1250                 [DEV_EVENT_VERIFY]      = ccw_device_delay_verify,
1251         },
1252         [DEV_STATE_ONLINE] = {
1253                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1254                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1255                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1256                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1257         },
1258         [DEV_STATE_W4SENSE] = {
1259                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1260                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1261                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1262                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1263         },
1264         [DEV_STATE_DISBAND_PGID] = {
1265                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1266                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1267                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1268                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1269         },
1270         [DEV_STATE_BOXED] = {
1271                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1272                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1273                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1274                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1275         },
1276         /* states to wait for i/o completion before doing something */
1277         [DEV_STATE_CLEAR_VERIFY] = {
1278                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1279                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1280                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1281                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1282         },
1283         [DEV_STATE_TIMEOUT_KILL] = {
1284                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1285                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1286                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1287                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1288         },
1289         [DEV_STATE_WAIT4IO] = {
1290                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1291                 [DEV_EVENT_INTERRUPT]   = ccw_device_wait4io_irq,
1292                 [DEV_EVENT_TIMEOUT]     = ccw_device_wait4io_timeout,
1293                 [DEV_EVENT_VERIFY]      = ccw_device_delay_verify,
1294         },
1295         [DEV_STATE_QUIESCE] = {
1296                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1297                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1298                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1299                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1300         },
1301         /* special states for devices gone not operational */
1302         [DEV_STATE_DISCONNECTED] = {
1303                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1304                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1305                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1306                 [DEV_EVENT_VERIFY]      = ccw_device_start_id,
1307         },
1308         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1309                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1310                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1311                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1312                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1313         },
1314         [DEV_STATE_CMFCHANGE] = {
1315                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1316                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1317                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1318                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1319         },
1320         [DEV_STATE_CMFUPDATE] = {
1321                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1322                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1323                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1324                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1325         },
1326 };
1327
1328 /*
1329  * io_subchannel_irq is called for "real" interrupts or for status
1330  * pending conditions on msch.
1331  */
1332 void
1333 io_subchannel_irq (struct device *pdev)
1334 {
1335         struct ccw_device *cdev;
1336
1337         cdev = to_subchannel(pdev)->dev.driver_data;
1338
1339         CIO_TRACE_EVENT (3, "IRQ");
1340         CIO_TRACE_EVENT (3, pdev->bus_id);
1341         if (cdev)
1342                 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1343 }
1344
1345 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);