Pileus Git - ~andy/linux/blob - drivers/s390/cio/device_fsm.c

   1 /*
   2  * drivers/s390/cio/device_fsm.c
   3  * finite state machine for device handling
   4  *
   5  *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
   6  *                       IBM Corporation
   7  *    Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
   8  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/jiffies.h>
  14 #include <linux/string.h>
  15
  16 #include <asm/ccwdev.h>
  17 #include <asm/cio.h>
  18
  19 #include "cio.h"
  20 #include "cio_debug.h"
  21 #include "css.h"
  22 #include "device.h"
  23 #include "chsc.h"
  24 #include "ioasm.h"
  25
  26 int
  27 device_is_online(struct subchannel *sch)
  28 {
  29         struct ccw_device *cdev;
  30
  31         if (!sch->dev.driver_data)
  32                 return 0;
  33         cdev = sch->dev.driver_data;
  34         return (cdev->private->state == DEV_STATE_ONLINE);
  35 }
  36
  37 int
  38 device_is_disconnected(struct subchannel *sch)
  39 {
  40         struct ccw_device *cdev;
  41
  42         if (!sch->dev.driver_data)
  43                 return 0;
  44         cdev = sch->dev.driver_data;
  45         return (cdev->private->state == DEV_STATE_DISCONNECTED ||
  46                 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
  47 }
  48
  49 void
  50 device_set_disconnected(struct subchannel *sch)
  51 {
  52         struct ccw_device *cdev;
  53
  54         if (!sch->dev.driver_data)
  55                 return;
  56         cdev = sch->dev.driver_data;
  57         ccw_device_set_timeout(cdev, 0);
  58         cdev->private->flags.fake_irb = 0;
  59         cdev->private->state = DEV_STATE_DISCONNECTED;
  60 }
  61
  62 void
  63 device_set_waiting(struct subchannel *sch)
  64 {
  65         struct ccw_device *cdev;
  66
  67         if (!sch->dev.driver_data)
  68                 return;
  69         cdev = sch->dev.driver_data;
  70         ccw_device_set_timeout(cdev, 10*HZ);
  71         cdev->private->state = DEV_STATE_WAIT4IO;
  72 }
  73
  74 /*
  75  * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
  76  */
  77 static void
  78 ccw_device_timeout(unsigned long data)
  79 {
  80         struct ccw_device *cdev;
  81
  82         cdev = (struct ccw_device *) data;
  83         spin_lock_irq(cdev->ccwlock);
  84         dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
  85         spin_unlock_irq(cdev->ccwlock);
  86 }
  87
  88 /*
  89  * Set timeout
  90  */
  91 void
  92 ccw_device_set_timeout(struct ccw_device *cdev, int expires)
  93 {
  94         if (expires == 0) {
  95                 del_timer(&cdev->private->timer);
  96                 return;
  97         }
  98         if (timer_pending(&cdev->private->timer)) {
  99                 if (mod_timer(&cdev->private->timer, jiffies + expires))
 100                         return;
 101         }
 102         cdev->private->timer.function = ccw_device_timeout;
 103         cdev->private->timer.data = (unsigned long) cdev;
 104         cdev->private->timer.expires = jiffies + expires;
 105         add_timer(&cdev->private->timer);
 106 }
 107
 108 /* Kill any pending timers after machine check. */
 109 void
 110 device_kill_pending_timer(struct subchannel *sch)
 111 {
 112         struct ccw_device *cdev;
 113
 114         if (!sch->dev.driver_data)
 115                 return;
 116         cdev = sch->dev.driver_data;
 117         ccw_device_set_timeout(cdev, 0);
 118 }
 119
 120 /*
 121  * Cancel running i/o. This is called repeatedly since halt/clear are
 122  * asynchronous operations. We do one try with cio_cancel, two tries
 123  * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
 124  * Returns 0 if device now idle, -ENODEV for device not operational and
 125  * -EBUSY if an interrupt is expected (either from halt/clear or from a
 126  * status pending).
 127  */
 128 int
 129 ccw_device_cancel_halt_clear(struct ccw_device *cdev)
 130 {
 131         struct subchannel *sch;
 132         int ret;
 133
 134         sch = to_subchannel(cdev->dev.parent);
 135         ret = stsch(sch->schid, &sch->schib);
 136         if (ret || !sch->schib.pmcw.dnv)
 137                 return -ENODEV;
 138         if (!sch->schib.pmcw.ena || sch->schib.scsw.actl == 0)
 139                 /* Not operational or no activity -> done. */
 140                 return 0;
 141         /* Stage 1: cancel io. */
 142         if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) &&
 143             !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
 144                 ret = cio_cancel(sch);
 145                 if (ret != -EINVAL)
 146                         return ret;
 147                 /* cancel io unsuccessful. From now on it is asynchronous. */
 148                 cdev->private->iretry = 3;      /* 3 halt retries. */
 149         }
 150         if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
 151                 /* Stage 2: halt io. */
 152                 if (cdev->private->iretry) {
 153                         cdev->private->iretry--;
 154                         ret = cio_halt(sch);
 155                         return (ret == 0) ? -EBUSY : ret;
 156                 }
 157                 /* halt io unsuccessful. */
 158                 cdev->private->iretry = 255;    /* 255 clear retries. */
 159         }
 160         /* Stage 3: clear io. */
 161         if (cdev->private->iretry) {
 162                 cdev->private->iretry--;
 163                 ret = cio_clear (sch);
 164                 return (ret == 0) ? -EBUSY : ret;
 165         }
 166         panic("Can't stop i/o on subchannel.\n");
 167 }
 168
 169 static int
 170 ccw_device_handle_oper(struct ccw_device *cdev)
 171 {
 172         struct subchannel *sch;
 173
 174         sch = to_subchannel(cdev->dev.parent);
 175         cdev->private->flags.recog_done = 1;
 176         /*
 177          * Check if cu type and device type still match. If
 178          * not, it is certainly another device and we have to
 179          * de- and re-register. Also check here for non-matching devno.
 180          */
 181         if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
 182             cdev->id.cu_model != cdev->private->senseid.cu_model ||
 183             cdev->id.dev_type != cdev->private->senseid.dev_type ||
 184             cdev->id.dev_model != cdev->private->senseid.dev_model ||
 185             cdev->private->devno != sch->schib.pmcw.dev) {
 186                 PREPARE_WORK(&cdev->private->kick_work,
 187                              ccw_device_do_unreg_rereg, (void *)cdev);
 188                 queue_work(ccw_device_work, &cdev->private->kick_work);
 189                 return 0;
 190         }
 191         cdev->private->flags.donotify = 1;
 192         return 1;
 193 }
 194
 195 /*
 196  * The machine won't give us any notification by machine check if a chpid has
 197  * been varied online on the SE so we have to find out by magic (i. e. driving
 198  * the channel subsystem to device selection and updating our path masks).
 199  */
 200 static inline void
 201 __recover_lost_chpids(struct subchannel *sch, int old_lpm)
 202 {
 203         int mask, i;
 204
 205         for (i = 0; i<8; i++) {
 206                 mask = 0x80 >> i;
 207                 if (!(sch->lpm & mask))
 208                         continue;
 209                 if (old_lpm & mask)
 210                         continue;
 211                 chpid_is_actually_online(sch->schib.pmcw.chpid[i]);
 212         }
 213 }
 214
 215 /*
 216  * Stop device recognition.
 217  */
 218 static void
 219 ccw_device_recog_done(struct ccw_device *cdev, int state)
 220 {
 221         struct subchannel *sch;
 222         int notify, old_lpm, same_dev;
 223
 224         sch = to_subchannel(cdev->dev.parent);
 225
 226         ccw_device_set_timeout(cdev, 0);
 227         cio_disable_subchannel(sch);
 228         /*
 229          * Now that we tried recognition, we have performed device selection
 230          * through ssch() and the path information is up to date.
 231          */
 232         old_lpm = sch->lpm;
 233         stsch(sch->schid, &sch->schib);
 234         sch->lpm = sch->schib.pmcw.pim &
 235                 sch->schib.pmcw.pam &
 236                 sch->schib.pmcw.pom &
 237                 sch->opm;
 238         /* Check since device may again have become not operational. */
 239         if (!sch->schib.pmcw.dnv)
 240                 state = DEV_STATE_NOT_OPER;
 241         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
 242                 /* Force reprobe on all chpids. */
 243                 old_lpm = 0;
 244         if (sch->lpm != old_lpm)
 245                 __recover_lost_chpids(sch, old_lpm);
 246         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 247                 if (state == DEV_STATE_NOT_OPER) {
 248                         cdev->private->flags.recog_done = 1;
 249                         cdev->private->state = DEV_STATE_DISCONNECTED;
 250                         return;
 251                 }
 252                 /* Boxed devices don't need extra treatment. */
 253         }
 254         notify = 0;
 255         same_dev = 0; /* Keep the compiler quiet... */
 256         switch (state) {
 257         case DEV_STATE_NOT_OPER:
 258                 CIO_DEBUG(KERN_WARNING, 2,
 259                           "SenseID : unknown device %04x on subchannel "
 260                           "0.%x.%04x\n", cdev->private->devno,
 261                           sch->schid.ssid, sch->schid.sch_no);
 262                 break;
 263         case DEV_STATE_OFFLINE:
 264                 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 265                         same_dev = ccw_device_handle_oper(cdev);
 266                         notify = 1;
 267                 }
 268                 /* fill out sense information */
 269                 cdev->id = (struct ccw_device_id) {
 270                         .cu_type   = cdev->private->senseid.cu_type,
 271                         .cu_model  = cdev->private->senseid.cu_model,
 272                         .dev_type  = cdev->private->senseid.dev_type,
 273                         .dev_model = cdev->private->senseid.dev_model,
 274                 };
 275                 if (notify) {
 276                         cdev->private->state = DEV_STATE_OFFLINE;
 277                         if (same_dev) {
 278                                 /* Get device online again. */
 279                                 ccw_device_online(cdev);
 280                                 wake_up(&cdev->private->wait_q);
 281                         }
 282                         return;
 283                 }
 284                 /* Issue device info message. */
 285                 CIO_DEBUG(KERN_INFO, 2, "SenseID : device 0.%x.%04x reports: "
 286                           "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
 287                           "%04X/%02X\n",
 288                           cdev->private->ssid, cdev->private->devno,
 289                           cdev->id.cu_type, cdev->id.cu_model,
 290                           cdev->id.dev_type, cdev->id.dev_model);
 291                 break;
 292         case DEV_STATE_BOXED:
 293                 CIO_DEBUG(KERN_WARNING, 2,
 294                           "SenseID : boxed device %04x on subchannel "
 295                           "0.%x.%04x\n", cdev->private->devno,
 296                           sch->schid.ssid, sch->schid.sch_no);
 297                 break;
 298         }
 299         cdev->private->state = state;
 300         io_subchannel_recog_done(cdev);
 301         if (state != DEV_STATE_NOT_OPER)
 302                 wake_up(&cdev->private->wait_q);
 303 }
 304
 305 /*
 306  * Function called from device_id.c after sense id has completed.
 307  */
 308 void
 309 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
 310 {
 311         switch (err) {
 312         case 0:
 313                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
 314                 break;
 315         case -ETIME:            /* Sense id stopped by timeout. */
 316                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 317                 break;
 318         default:
 319                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 320                 break;
 321         }
 322 }
 323
 324 static void
 325 ccw_device_oper_notify(void *data)
 326 {
 327         struct ccw_device *cdev;
 328         struct subchannel *sch;
 329         int ret;
 330
 331         cdev = (struct ccw_device *)data;
 332         sch = to_subchannel(cdev->dev.parent);
 333         ret = (sch->driver && sch->driver->notify) ?
 334                 sch->driver->notify(&sch->dev, CIO_OPER) : 0;
 335         if (!ret)
 336                 /* Driver doesn't want device back. */
 337                 ccw_device_do_unreg_rereg((void *)cdev);
 338         else {
 339                 /* Reenable channel measurements, if needed. */
 340                 cmf_reenable(cdev);
 341                 wake_up(&cdev->private->wait_q);
 342         }
 343 }
 344
 345 /*
 346  * Finished with online/offline processing.
 347  */
 348 static void
 349 ccw_device_done(struct ccw_device *cdev, int state)
 350 {
 351         struct subchannel *sch;
 352
 353         sch = to_subchannel(cdev->dev.parent);
 354
 355         if (state != DEV_STATE_ONLINE)
 356                 cio_disable_subchannel(sch);
 357
 358         /* Reset device status. */
 359         memset(&cdev->private->irb, 0, sizeof(struct irb));
 360
 361         cdev->private->state = state;
 362
 363
 364         if (state == DEV_STATE_BOXED)
 365                 CIO_DEBUG(KERN_WARNING, 2,
 366                           "Boxed device %04x on subchannel %04x\n",
 367                           cdev->private->devno, sch->schid.sch_no);
 368
 369         if (cdev->private->flags.donotify) {
 370                 cdev->private->flags.donotify = 0;
 371                 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify,
 372                              (void *)cdev);
 373                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 374         }
 375         wake_up(&cdev->private->wait_q);
 376
 377         if (css_init_done && state != DEV_STATE_ONLINE)
 378                 put_device (&cdev->dev);
 379 }
 380
 381 static inline int cmp_pgid(struct pgid *p1, struct pgid *p2)
 382 {
 383         char *c1;
 384         char *c2;
 385
 386         c1 = (char *)p1;
 387         c2 = (char *)p2;
 388
 389         return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
 390 }
 391
 392 static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
 393 {
 394         int i;
 395         int last;
 396
 397         last = 0;
 398         for (i = 0; i < 8; i++) {
 399                 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
 400                         /* No PGID yet */
 401                         continue;
 402                 if (cdev->private->pgid[last].inf.ps.state1 ==
 403                     SNID_STATE1_RESET) {
 404                         /* First non-zero PGID */
 405                         last = i;
 406                         continue;
 407                 }
 408                 if (cmp_pgid(&cdev->private->pgid[i],
 409                              &cdev->private->pgid[last]) == 0)
 410                         /* Non-conflicting PGIDs */
 411                         continue;
 412
 413                 /* PGID mismatch, can't pathgroup. */
 414                 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
 415                               "0.%x.%04x, can't pathgroup\n",
 416                               cdev->private->ssid, cdev->private->devno);
 417                 cdev->private->options.pgroup = 0;
 418                 return;
 419         }
 420         if (cdev->private->pgid[last].inf.ps.state1 ==
 421             SNID_STATE1_RESET)
 422                 /* No previous pgid found */
 423                 memcpy(&cdev->private->pgid[0], &css[0]->global_pgid,
 424                        sizeof(struct pgid));
 425         else
 426                 /* Use existing pgid */
 427                 memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
 428                        sizeof(struct pgid));
 429 }
 430
 431 /*
 432  * Function called from device_pgid.c after sense path ground has completed.
 433  */
 434 void
 435 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
 436 {
 437         struct subchannel *sch;
 438
 439         sch = to_subchannel(cdev->dev.parent);
 440         switch (err) {
 441         case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
 442                 cdev->private->options.pgroup = 0;
 443                 break;
 444         case 0: /* success */
 445         case -EACCES: /* partial success, some paths not operational */
 446                 /* Check if all pgids are equal or 0. */
 447                 __ccw_device_get_common_pgid(cdev);
 448                 break;
 449         case -ETIME:            /* Sense path group id stopped by timeout. */
 450         case -EUSERS:           /* device is reserved for someone else. */
 451                 ccw_device_done(cdev, DEV_STATE_BOXED);
 452                 return;
 453         default:
 454                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 455                 return;
 456         }
 457         /* Start Path Group verification. */
 458         sch->vpm = 0;   /* Start with no path groups set. */
 459         cdev->private->state = DEV_STATE_VERIFY;
 460         ccw_device_verify_start(cdev);
 461 }
 462
 463 /*
 464  * Start device recognition.
 465  */
 466 int
 467 ccw_device_recognition(struct ccw_device *cdev)
 468 {
 469         struct subchannel *sch;
 470         int ret;
 471
 472         if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
 473             (cdev->private->state != DEV_STATE_BOXED))
 474                 return -EINVAL;
 475         sch = to_subchannel(cdev->dev.parent);
 476         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 477         if (ret != 0)
 478                 /* Couldn't enable the subchannel for i/o. Sick device. */
 479                 return ret;
 480
 481         /* After 60s the device recognition is considered to have failed. */
 482         ccw_device_set_timeout(cdev, 60*HZ);
 483
 484         /*
 485          * We used to start here with a sense pgid to find out whether a device
 486          * is locked by someone else. Unfortunately, the sense pgid command
 487          * code has other meanings on devices predating the path grouping
 488          * algorithm, so we start with sense id and box the device after an
 489          * timeout (or if sense pgid during path verification detects the device
 490          * is locked, as may happen on newer devices).
 491          */
 492         cdev->private->flags.recog_done = 0;
 493         cdev->private->state = DEV_STATE_SENSE_ID;
 494         ccw_device_sense_id_start(cdev);
 495         return 0;
 496 }
 497
 498 /*
 499  * Handle timeout in device recognition.
 500  */
 501 static void
 502 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 503 {
 504         int ret;
 505
 506         ret = ccw_device_cancel_halt_clear(cdev);
 507         switch (ret) {
 508         case 0:
 509                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 510                 break;
 511         case -ENODEV:
 512                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 513                 break;
 514         default:
 515                 ccw_device_set_timeout(cdev, 3*HZ);
 516         }
 517 }
 518
 519
 520 static void
 521 ccw_device_nopath_notify(void *data)
 522 {
 523         struct ccw_device *cdev;
 524         struct subchannel *sch;
 525         int ret;
 526
 527         cdev = (struct ccw_device *)data;
 528         sch = to_subchannel(cdev->dev.parent);
 529         /* Extra sanity. */
 530         if (sch->lpm)
 531                 return;
 532         ret = (sch->driver && sch->driver->notify) ?
 533                 sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0;
 534         if (!ret) {
 535                 if (get_device(&sch->dev)) {
 536                         /* Driver doesn't want to keep device. */
 537                         cio_disable_subchannel(sch);
 538                         if (get_device(&cdev->dev)) {
 539                                 PREPARE_WORK(&cdev->private->kick_work,
 540                                              ccw_device_call_sch_unregister,
 541                                              (void *)cdev);
 542                                 queue_work(ccw_device_work,
 543                                            &cdev->private->kick_work);
 544                         } else
 545                                 put_device(&sch->dev);
 546                 }
 547         } else {
 548                 cio_disable_subchannel(sch);
 549                 ccw_device_set_timeout(cdev, 0);
 550                 cdev->private->flags.fake_irb = 0;
 551                 cdev->private->state = DEV_STATE_DISCONNECTED;
 552                 wake_up(&cdev->private->wait_q);
 553         }
 554 }
 555
 556 void
 557 ccw_device_verify_done(struct ccw_device *cdev, int err)
 558 {
 559         cdev->private->flags.doverify = 0;
 560         switch (err) {
 561         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 562                 cdev->private->options.pgroup = 0;
 563         case 0:
 564                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 565                 /* Deliver fake irb to device driver, if needed. */
 566                 if (cdev->private->flags.fake_irb) {
 567                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 568                         cdev->private->irb.scsw = (struct scsw) {
 569                                 .cc = 1,
 570                                 .fctl = SCSW_FCTL_START_FUNC,
 571                                 .actl = SCSW_ACTL_START_PEND,
 572                                 .stctl = SCSW_STCTL_STATUS_PEND,
 573                         };
 574                         cdev->private->flags.fake_irb = 0;
 575                         if (cdev->handler)
 576                                 cdev->handler(cdev, cdev->private->intparm,
 577                                               &cdev->private->irb);
 578                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 579                 }
 580                 break;
 581         case -ETIME:
 582                 ccw_device_done(cdev, DEV_STATE_BOXED);
 583                 break;
 584         default:
 585                 PREPARE_WORK(&cdev->private->kick_work,
 586                              ccw_device_nopath_notify, (void *)cdev);
 587                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 588                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 589                 break;
 590         }
 591 }
 592
 593 /*
 594  * Get device online.
 595  */
 596 int
 597 ccw_device_online(struct ccw_device *cdev)
 598 {
 599         struct subchannel *sch;
 600         int ret;
 601
 602         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 603             (cdev->private->state != DEV_STATE_BOXED))
 604                 return -EINVAL;
 605         sch = to_subchannel(cdev->dev.parent);
 606         if (css_init_done && !get_device(&cdev->dev))
 607                 return -ENODEV;
 608         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 609         if (ret != 0) {
 610                 /* Couldn't enable the subchannel for i/o. Sick device. */
 611                 if (ret == -ENODEV)
 612                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 613                 return ret;
 614         }
 615         /* Do we want to do path grouping? */
 616         if (!cdev->private->options.pgroup) {
 617                 /* Start initial path verification. */
 618                 cdev->private->state = DEV_STATE_VERIFY;
 619                 ccw_device_verify_start(cdev);
 620                 return 0;
 621         }
 622         /* Do a SensePGID first. */
 623         cdev->private->state = DEV_STATE_SENSE_PGID;
 624         ccw_device_sense_pgid_start(cdev);
 625         return 0;
 626 }
 627
 628 void
 629 ccw_device_disband_done(struct ccw_device *cdev, int err)
 630 {
 631         switch (err) {
 632         case 0:
 633                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 634                 break;
 635         case -ETIME:
 636                 ccw_device_done(cdev, DEV_STATE_BOXED);
 637                 break;
 638         default:
 639                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 640                 break;
 641         }
 642 }
 643
 644 /*
 645  * Shutdown device.
 646  */
 647 int
 648 ccw_device_offline(struct ccw_device *cdev)
 649 {
 650         struct subchannel *sch;
 651
 652         sch = to_subchannel(cdev->dev.parent);
 653         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
 654                 return -ENODEV;
 655         if (cdev->private->state != DEV_STATE_ONLINE) {
 656                 if (sch->schib.scsw.actl != 0)
 657                         return -EBUSY;
 658                 return -EINVAL;
 659         }
 660         if (sch->schib.scsw.actl != 0)
 661                 return -EBUSY;
 662         /* Are we doing path grouping? */
 663         if (!cdev->private->options.pgroup) {
 664                 /* No, set state offline immediately. */
 665                 sch->vpm = 0;
 666                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 667                 return 0;
 668         }
 669         /* Start Set Path Group commands. */
 670         cdev->private->state = DEV_STATE_DISBAND_PGID;
 671         ccw_device_disband_start(cdev);
 672         return 0;
 673 }
 674
 675 /*
 676  * Handle timeout in device online/offline process.
 677  */
 678 static void
 679 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 680 {
 681         int ret;
 682
 683         ret = ccw_device_cancel_halt_clear(cdev);
 684         switch (ret) {
 685         case 0:
 686                 ccw_device_done(cdev, DEV_STATE_BOXED);
 687                 break;
 688         case -ENODEV:
 689                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 690                 break;
 691         default:
 692                 ccw_device_set_timeout(cdev, 3*HZ);
 693         }
 694 }
 695
 696 /*
 697  * Handle not oper event in device recognition.
 698  */
 699 static void
 700 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 701 {
 702         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 703 }
 704
 705 /*
 706  * Handle not operational event while offline.
 707  */
 708 static void
 709 ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 710 {
 711         struct subchannel *sch;
 712
 713         cdev->private->state = DEV_STATE_NOT_OPER;
 714         sch = to_subchannel(cdev->dev.parent);
 715         if (get_device(&cdev->dev)) {
 716                 PREPARE_WORK(&cdev->private->kick_work,
 717                              ccw_device_call_sch_unregister, (void *)cdev);
 718                 queue_work(ccw_device_work, &cdev->private->kick_work);
 719         }
 720         wake_up(&cdev->private->wait_q);
 721 }
 722
 723 /*
 724  * Handle not operational event while online.
 725  */
 726 static void
 727 ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 728 {
 729         struct subchannel *sch;
 730
 731         sch = to_subchannel(cdev->dev.parent);
 732         if (sch->driver->notify &&
 733             sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) {
 734                         ccw_device_set_timeout(cdev, 0);
 735                         cdev->private->flags.fake_irb = 0;
 736                         cdev->private->state = DEV_STATE_DISCONNECTED;
 737                         wake_up(&cdev->private->wait_q);
 738                         return;
 739         }
 740         cdev->private->state = DEV_STATE_NOT_OPER;
 741         cio_disable_subchannel(sch);
 742         if (sch->schib.scsw.actl != 0) {
 743                 // FIXME: not-oper indication to device driver ?
 744                 ccw_device_call_handler(cdev);
 745         }
 746         if (get_device(&cdev->dev)) {
 747                 PREPARE_WORK(&cdev->private->kick_work,
 748                              ccw_device_call_sch_unregister, (void *)cdev);
 749                 queue_work(ccw_device_work, &cdev->private->kick_work);
 750         }
 751         wake_up(&cdev->private->wait_q);
 752 }
 753
 754 /*
 755  * Handle path verification event.
 756  */
 757 static void
 758 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 759 {
 760         struct subchannel *sch;
 761
 762         if (cdev->private->state == DEV_STATE_W4SENSE) {
 763                 cdev->private->flags.doverify = 1;
 764                 return;
 765         }
 766         sch = to_subchannel(cdev->dev.parent);
 767         /*
 768          * Since we might not just be coming from an interrupt from the
 769          * subchannel we have to update the schib.
 770          */
 771         stsch(sch->schid, &sch->schib);
 772
 773         if (sch->schib.scsw.actl != 0 ||
 774             (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
 775                 /*
 776                  * No final status yet or final status not yet delivered
 777                  * to the device driver. Can't do path verfication now,
 778                  * delay until final status was delivered.
 779                  */
 780                 cdev->private->flags.doverify = 1;
 781                 return;
 782         }
 783         /* Device is idle, we can do the path verification. */
 784         cdev->private->state = DEV_STATE_VERIFY;
 785         ccw_device_verify_start(cdev);
 786 }
 787
 788 /*
 789  * Got an interrupt for a normal io (state online).
 790  */
 791 static void
 792 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 793 {
 794         struct irb *irb;
 795
 796         irb = (struct irb *) __LC_IRB;
 797         /* Check for unsolicited interrupt. */
 798         if ((irb->scsw.stctl ==
 799                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
 800             && (!irb->scsw.cc)) {
 801                 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 802                     !irb->esw.esw0.erw.cons) {
 803                         /* Unit check but no sense data. Need basic sense. */
 804                         if (ccw_device_do_sense(cdev, irb) != 0)
 805                                 goto call_handler_unsol;
 806                         memcpy(&cdev->private->irb, irb, sizeof(struct irb));
 807                         cdev->private->state = DEV_STATE_W4SENSE;
 808                         cdev->private->intparm = 0;
 809                         return;
 810                 }
 811 call_handler_unsol:
 812                 if (cdev->handler)
 813                         cdev->handler (cdev, 0, irb);
 814                 return;
 815         }
 816         /* Accumulate status and find out if a basic sense is needed. */
 817         ccw_device_accumulate_irb(cdev, irb);
 818         if (cdev->private->flags.dosense) {
 819                 if (ccw_device_do_sense(cdev, irb) == 0) {
 820                         cdev->private->state = DEV_STATE_W4SENSE;
 821                 }
 822                 return;
 823         }
 824         /* Call the handler. */
 825         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 826                 /* Start delayed path verification. */
 827                 ccw_device_online_verify(cdev, 0);
 828 }
 829
 830 /*
 831  * Got an timeout in online state.
 832  */
 833 static void
 834 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 835 {
 836         int ret;
 837
 838         ccw_device_set_timeout(cdev, 0);
 839         ret = ccw_device_cancel_halt_clear(cdev);
 840         if (ret == -EBUSY) {
 841                 ccw_device_set_timeout(cdev, 3*HZ);
 842                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 843                 return;
 844         }
 845         if (ret == -ENODEV) {
 846                 struct subchannel *sch;
 847
 848                 sch = to_subchannel(cdev->dev.parent);
 849                 if (!sch->lpm) {
 850                         PREPARE_WORK(&cdev->private->kick_work,
 851                                      ccw_device_nopath_notify, (void *)cdev);
 852                         queue_work(ccw_device_notify_work,
 853                                    &cdev->private->kick_work);
 854                 } else
 855                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 856         } else if (cdev->handler)
 857                 cdev->handler(cdev, cdev->private->intparm,
 858                               ERR_PTR(-ETIMEDOUT));
 859 }
 860
 861 /*
 862  * Got an interrupt for a basic sense.
 863  */
 864 void
 865 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 866 {
 867         struct irb *irb;
 868
 869         irb = (struct irb *) __LC_IRB;
 870         /* Check for unsolicited interrupt. */
 871         if (irb->scsw.stctl ==
 872                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 873                 if (irb->scsw.cc == 1)
 874                         /* Basic sense hasn't started. Try again. */
 875                         ccw_device_do_sense(cdev, irb);
 876                 else {
 877                         printk("Huh? %s(%s): unsolicited interrupt...\n",
 878                                __FUNCTION__, cdev->dev.bus_id);
 879                         if (cdev->handler)
 880                                 cdev->handler (cdev, 0, irb);
 881                 }
 882                 return;
 883         }
 884         /*
 885          * Check if a halt or clear has been issued in the meanwhile. If yes,
 886          * only deliver the halt/clear interrupt to the device driver as if it
 887          * had killed the original request.
 888          */
 889         if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
 890                 cdev->private->flags.dosense = 0;
 891                 memset(&cdev->private->irb, 0, sizeof(struct irb));
 892                 ccw_device_accumulate_irb(cdev, irb);
 893                 goto call_handler;
 894         }
 895         /* Add basic sense info to irb. */
 896         ccw_device_accumulate_basic_sense(cdev, irb);
 897         if (cdev->private->flags.dosense) {
 898                 /* Another basic sense is needed. */
 899                 ccw_device_do_sense(cdev, irb);
 900                 return;
 901         }
 902 call_handler:
 903         cdev->private->state = DEV_STATE_ONLINE;
 904         /* Call the handler. */
 905         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 906                 /* Start delayed path verification. */
 907                 ccw_device_online_verify(cdev, 0);
 908 }
 909
 910 static void
 911 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 912 {
 913         struct irb *irb;
 914
 915         irb = (struct irb *) __LC_IRB;
 916         /* Accumulate status. We don't do basic sense. */
 917         ccw_device_accumulate_irb(cdev, irb);
 918         /* Remember to clear irb to avoid residuals. */
 919         memset(&cdev->private->irb, 0, sizeof(struct irb));
 920         /* Try to start delayed device verification. */
 921         ccw_device_online_verify(cdev, 0);
 922         /* Note: Don't call handler for cio initiated clear! */
 923 }
 924
 925 static void
 926 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
 927 {
 928         struct subchannel *sch;
 929
 930         sch = to_subchannel(cdev->dev.parent);
 931         ccw_device_set_timeout(cdev, 0);
 932         /* OK, i/o is dead now. Call interrupt handler. */
 933         cdev->private->state = DEV_STATE_ONLINE;
 934         if (cdev->handler)
 935                 cdev->handler(cdev, cdev->private->intparm,
 936                               ERR_PTR(-ETIMEDOUT));
 937         if (!sch->lpm) {
 938                 PREPARE_WORK(&cdev->private->kick_work,
 939                              ccw_device_nopath_notify, (void *)cdev);
 940                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 941         } else if (cdev->private->flags.doverify)
 942                 /* Start delayed path verification. */
 943                 ccw_device_online_verify(cdev, 0);
 944 }
 945
 946 static void
 947 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 948 {
 949         int ret;
 950
 951         ret = ccw_device_cancel_halt_clear(cdev);
 952         if (ret == -EBUSY) {
 953                 ccw_device_set_timeout(cdev, 3*HZ);
 954                 return;
 955         }
 956         if (ret == -ENODEV) {
 957                 struct subchannel *sch;
 958
 959                 sch = to_subchannel(cdev->dev.parent);
 960                 if (!sch->lpm) {
 961                         PREPARE_WORK(&cdev->private->kick_work,
 962                                      ccw_device_nopath_notify, (void *)cdev);
 963                         queue_work(ccw_device_notify_work,
 964                                    &cdev->private->kick_work);
 965                 } else
 966                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 967                 return;
 968         }
 969         //FIXME: Can we get here?
 970         cdev->private->state = DEV_STATE_ONLINE;
 971         if (cdev->handler)
 972                 cdev->handler(cdev, cdev->private->intparm,
 973                               ERR_PTR(-ETIMEDOUT));
 974 }
 975
 976 static void
 977 ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event)
 978 {
 979         struct irb *irb;
 980         struct subchannel *sch;
 981
 982         irb = (struct irb *) __LC_IRB;
 983         /*
 984          * Accumulate status and find out if a basic sense is needed.
 985          * This is fine since we have already adapted the lpm.
 986          */
 987         ccw_device_accumulate_irb(cdev, irb);
 988         if (cdev->private->flags.dosense) {
 989                 if (ccw_device_do_sense(cdev, irb) == 0) {
 990                         cdev->private->state = DEV_STATE_W4SENSE;
 991                 }
 992                 return;
 993         }
 994
 995         /* Iff device is idle, reset timeout. */
 996         sch = to_subchannel(cdev->dev.parent);
 997         if (!stsch(sch->schid, &sch->schib))
 998                 if (sch->schib.scsw.actl == 0)
 999                         ccw_device_set_timeout(cdev, 0);
1000         /* Call the handler. */
1001         ccw_device_call_handler(cdev);
1002         if (!sch->lpm) {
1003                 PREPARE_WORK(&cdev->private->kick_work,
1004                              ccw_device_nopath_notify, (void *)cdev);
1005                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
1006         } else if (cdev->private->flags.doverify)
1007                 ccw_device_online_verify(cdev, 0);
1008 }
1009
1010 static void
1011 ccw_device_wait4io_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1012 {
1013         int ret;
1014         struct subchannel *sch;
1015
1016         sch = to_subchannel(cdev->dev.parent);
1017         ccw_device_set_timeout(cdev, 0);
1018         ret = ccw_device_cancel_halt_clear(cdev);
1019         if (ret == -EBUSY) {
1020                 ccw_device_set_timeout(cdev, 3*HZ);
1021                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
1022                 return;
1023         }
1024         if (ret == -ENODEV) {
1025                 if (!sch->lpm) {
1026                         PREPARE_WORK(&cdev->private->kick_work,
1027                                      ccw_device_nopath_notify, (void *)cdev);
1028                         queue_work(ccw_device_notify_work,
1029                                    &cdev->private->kick_work);
1030                 } else
1031                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1032                 return;
1033         }
1034         if (cdev->handler)
1035                 cdev->handler(cdev, cdev->private->intparm,
1036                               ERR_PTR(-ETIMEDOUT));
1037         if (!sch->lpm) {
1038                 PREPARE_WORK(&cdev->private->kick_work,
1039                              ccw_device_nopath_notify, (void *)cdev);
1040                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
1041         } else if (cdev->private->flags.doverify)
1042                 /* Start delayed path verification. */
1043                 ccw_device_online_verify(cdev, 0);
1044 }
1045
1046 static void
1047 ccw_device_wait4io_verify(struct ccw_device *cdev, enum dev_event dev_event)
1048 {
1049         /* When the I/O has terminated, we have to start verification. */
1050         cdev->private->flags.doverify = 1;
1051 }
1052
1053 static void
1054 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1055 {
1056         struct irb *irb;
1057
1058         switch (dev_event) {
1059         case DEV_EVENT_INTERRUPT:
1060                 irb = (struct irb *) __LC_IRB;
1061                 /* Check for unsolicited interrupt. */
1062                 if ((irb->scsw.stctl ==
1063                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1064                     (!irb->scsw.cc))
1065                         /* FIXME: we should restart stlck here, but this
1066                          * is extremely unlikely ... */
1067                         goto out_wakeup;
1068
1069                 ccw_device_accumulate_irb(cdev, irb);
1070                 /* We don't care about basic sense etc. */
1071                 break;
1072         default: /* timeout */
1073                 break;
1074         }
1075 out_wakeup:
1076         wake_up(&cdev->private->wait_q);
1077 }
1078
1079 static void
1080 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1081 {
1082         struct subchannel *sch;
1083
1084         sch = to_subchannel(cdev->dev.parent);
1085         if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1086                 /* Couldn't enable the subchannel for i/o. Sick device. */
1087                 return;
1088
1089         /* After 60s the device recognition is considered to have failed. */
1090         ccw_device_set_timeout(cdev, 60*HZ);
1091
1092         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1093         ccw_device_sense_id_start(cdev);
1094 }
1095
1096 void
1097 device_trigger_reprobe(struct subchannel *sch)
1098 {
1099         struct ccw_device *cdev;
1100
1101         if (!sch->dev.driver_data)
1102                 return;
1103         cdev = sch->dev.driver_data;
1104         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1105                 return;
1106
1107         /* Update some values. */
1108         if (stsch(sch->schid, &sch->schib))
1109                 return;
1110
1111         /*
1112          * The pim, pam, pom values may not be accurate, but they are the best
1113          * we have before performing device selection :/
1114          */
1115         sch->lpm = sch->schib.pmcw.pim &
1116                 sch->schib.pmcw.pam &
1117                 sch->schib.pmcw.pom &
1118                 sch->opm;
1119         /* Re-set some bits in the pmcw that were lost. */
1120         sch->schib.pmcw.isc = 3;
1121         sch->schib.pmcw.csense = 1;
1122         sch->schib.pmcw.ena = 0;
1123         if ((sch->lpm & (sch->lpm - 1)) != 0)
1124                 sch->schib.pmcw.mp = 1;
1125         sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1126         /* We should also udate ssd info, but this has to wait. */
1127         ccw_device_start_id(cdev, 0);
1128 }
1129
1130 static void
1131 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1132 {
1133         struct subchannel *sch;
1134
1135         sch = to_subchannel(cdev->dev.parent);
1136         /*
1137          * An interrupt in state offline means a previous disable was not
1138          * successful. Try again.
1139          */
1140         cio_disable_subchannel(sch);
1141 }
1142
1143 static void
1144 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1145 {
1146         retry_set_schib(cdev);
1147         cdev->private->state = DEV_STATE_ONLINE;
1148         dev_fsm_event(cdev, dev_event);
1149 }
1150
1151 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1152                                        enum dev_event dev_event)
1153 {
1154         cmf_retry_copy_block(cdev);
1155         cdev->private->state = DEV_STATE_ONLINE;
1156         dev_fsm_event(cdev, dev_event);
1157 }
1158
1159 static void
1160 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1161 {
1162         ccw_device_set_timeout(cdev, 0);
1163         if (dev_event == DEV_EVENT_NOTOPER)
1164                 cdev->private->state = DEV_STATE_NOT_OPER;
1165         else
1166                 cdev->private->state = DEV_STATE_OFFLINE;
1167         wake_up(&cdev->private->wait_q);
1168 }
1169
1170 static void
1171 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1172 {
1173         int ret;
1174
1175         ret = ccw_device_cancel_halt_clear(cdev);
1176         switch (ret) {
1177         case 0:
1178                 cdev->private->state = DEV_STATE_OFFLINE;
1179                 wake_up(&cdev->private->wait_q);
1180                 break;
1181         case -ENODEV:
1182                 cdev->private->state = DEV_STATE_NOT_OPER;
1183                 wake_up(&cdev->private->wait_q);
1184                 break;
1185         default:
1186                 ccw_device_set_timeout(cdev, HZ/10);
1187         }
1188 }
1189
1190 /*
1191  * No operation action. This is used e.g. to ignore a timeout event in
1192  * state offline.
1193  */
1194 static void
1195 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1196 {
1197 }
1198
1199 /*
1200  * Bug operation action.
1201  */
1202 static void
1203 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1204 {
1205         printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
1206                cdev->private->state, dev_event);
1207         BUG();
1208 }
1209
1210 /*
1211  * device statemachine
1212  */
1213 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1214         [DEV_STATE_NOT_OPER] = {
1215                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1216                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1217                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1218                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1219         },
1220         [DEV_STATE_SENSE_PGID] = {
1221                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1222                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1223                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1224                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1225         },
1226         [DEV_STATE_SENSE_ID] = {
1227                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1228                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1229                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1230                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1231         },
1232         [DEV_STATE_OFFLINE] = {
1233                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1234                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1235                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1236                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1237         },
1238         [DEV_STATE_VERIFY] = {
1239                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1240                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1241                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1242                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1243         },
1244         [DEV_STATE_ONLINE] = {
1245                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1246                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1247                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1248                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1249         },
1250         [DEV_STATE_W4SENSE] = {
1251                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1252                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1253                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1254                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1255         },
1256         [DEV_STATE_DISBAND_PGID] = {
1257                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1258                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1259                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1260                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1261         },
1262         [DEV_STATE_BOXED] = {
1263                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1264                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1265                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1266                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1267         },
1268         /* states to wait for i/o completion before doing something */
1269         [DEV_STATE_CLEAR_VERIFY] = {
1270                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1271                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1272                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1273                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1274         },
1275         [DEV_STATE_TIMEOUT_KILL] = {
1276                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1277                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1278                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1279                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1280         },
1281         [DEV_STATE_WAIT4IO] = {
1282                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1283                 [DEV_EVENT_INTERRUPT]   = ccw_device_wait4io_irq,
1284                 [DEV_EVENT_TIMEOUT]     = ccw_device_wait4io_timeout,
1285                 [DEV_EVENT_VERIFY]      = ccw_device_wait4io_verify,
1286         },
1287         [DEV_STATE_QUIESCE] = {
1288                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1289                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1290                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1291                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1292         },
1293         /* special states for devices gone not operational */
1294         [DEV_STATE_DISCONNECTED] = {
1295                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1296                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1297                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1298                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1299         },
1300         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1301                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1302                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1303                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1304                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1305         },
1306         [DEV_STATE_CMFCHANGE] = {
1307                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1308                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1309                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1310                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1311         },
1312         [DEV_STATE_CMFUPDATE] = {
1313                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1314                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1315                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1316                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1317         },
1318 };
1319
1320 /*
1321  * io_subchannel_irq is called for "real" interrupts or for status
1322  * pending conditions on msch.
1323  */
1324 void
1325 io_subchannel_irq (struct device *pdev)
1326 {
1327         struct ccw_device *cdev;
1328
1329         cdev = to_subchannel(pdev)->dev.driver_data;
1330
1331         CIO_TRACE_EVENT (3, "IRQ");
1332         CIO_TRACE_EVENT (3, pdev->bus_id);
1333         if (cdev)
1334                 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1335 }
1336
1337 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);