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

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