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(cohuck@de.ibm.com)
   8  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/config.h>
  13 #include <linux/init.h>
  14
  15 #include <asm/ccwdev.h>
  16 #include <asm/qdio.h>
  17
  18 #include "cio.h"
  19 #include "cio_debug.h"
  20 #include "css.h"
  21 #include "device.h"
  22 #include "chsc.h"
  23 #include "ioasm.h"
  24 #include "qdio.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->irq, &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->irq, &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 %04x\n",
 260                           cdev->private->devno, sch->irq);
 261                 break;
 262         case DEV_STATE_OFFLINE:
 263                 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 264                         same_dev = ccw_device_handle_oper(cdev);
 265                         notify = 1;
 266                 }
 267                 /* fill out sense information */
 268                 cdev->id = (struct ccw_device_id) {
 269                         .cu_type   = cdev->private->senseid.cu_type,
 270                         .cu_model  = cdev->private->senseid.cu_model,
 271                         .dev_type  = cdev->private->senseid.dev_type,
 272                         .dev_model = cdev->private->senseid.dev_model,
 273                 };
 274                 if (notify) {
 275                         cdev->private->state = DEV_STATE_OFFLINE;
 276                         if (same_dev) {
 277                                 /* Get device online again. */
 278                                 ccw_device_online(cdev);
 279                                 wake_up(&cdev->private->wait_q);
 280                         }
 281                         return;
 282                 }
 283                 /* Issue device info message. */
 284                 CIO_DEBUG(KERN_INFO, 2, "SenseID : device %04x reports: "
 285                           "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
 286                           "%04X/%02X\n", cdev->private->devno,
 287                           cdev->id.cu_type, cdev->id.cu_model,
 288                           cdev->id.dev_type, cdev->id.dev_model);
 289                 break;
 290         case DEV_STATE_BOXED:
 291                 CIO_DEBUG(KERN_WARNING, 2,
 292                           "SenseID : boxed device %04x on subchannel %04x\n",
 293                           cdev->private->devno, sch->irq);
 294                 break;
 295         }
 296         cdev->private->state = state;
 297         io_subchannel_recog_done(cdev);
 298         if (state != DEV_STATE_NOT_OPER)
 299                 wake_up(&cdev->private->wait_q);
 300 }
 301
 302 /*
 303  * Function called from device_id.c after sense id has completed.
 304  */
 305 void
 306 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
 307 {
 308         switch (err) {
 309         case 0:
 310                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
 311                 break;
 312         case -ETIME:            /* Sense id stopped by timeout. */
 313                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 314                 break;
 315         default:
 316                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 317                 break;
 318         }
 319 }
 320
 321 static void
 322 ccw_device_oper_notify(void *data)
 323 {
 324         struct ccw_device *cdev;
 325         struct subchannel *sch;
 326         int ret;
 327
 328         cdev = (struct ccw_device *)data;
 329         sch = to_subchannel(cdev->dev.parent);
 330         ret = (sch->driver && sch->driver->notify) ?
 331                 sch->driver->notify(&sch->dev, CIO_OPER) : 0;
 332         if (!ret)
 333                 /* Driver doesn't want device back. */
 334                 ccw_device_do_unreg_rereg((void *)cdev);
 335         else
 336                 wake_up(&cdev->private->wait_q);
 337 }
 338
 339 /*
 340  * Finished with online/offline processing.
 341  */
 342 static void
 343 ccw_device_done(struct ccw_device *cdev, int state)
 344 {
 345         struct subchannel *sch;
 346
 347         sch = to_subchannel(cdev->dev.parent);
 348
 349         if (state != DEV_STATE_ONLINE)
 350                 cio_disable_subchannel(sch);
 351
 352         /* Reset device status. */
 353         memset(&cdev->private->irb, 0, sizeof(struct irb));
 354
 355         cdev->private->state = state;
 356
 357
 358         if (state == DEV_STATE_BOXED)
 359                 CIO_DEBUG(KERN_WARNING, 2,
 360                           "Boxed device %04x on subchannel %04x\n",
 361                           cdev->private->devno, sch->irq);
 362
 363         if (cdev->private->flags.donotify) {
 364                 cdev->private->flags.donotify = 0;
 365                 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify,
 366                              (void *)cdev);
 367                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 368         }
 369         wake_up(&cdev->private->wait_q);
 370
 371         if (css_init_done && state != DEV_STATE_ONLINE)
 372                 put_device (&cdev->dev);
 373 }
 374
 375 /*
 376  * Function called from device_pgid.c after sense path ground has completed.
 377  */
 378 void
 379 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
 380 {
 381         struct subchannel *sch;
 382
 383         sch = to_subchannel(cdev->dev.parent);
 384         switch (err) {
 385         case 0:
 386                 /* Start Path Group verification. */
 387                 sch->vpm = 0;   /* Start with no path groups set. */
 388                 cdev->private->state = DEV_STATE_VERIFY;
 389                 ccw_device_verify_start(cdev);
 390                 break;
 391         case -ETIME:            /* Sense path group id stopped by timeout. */
 392         case -EUSERS:           /* device is reserved for someone else. */
 393                 ccw_device_done(cdev, DEV_STATE_BOXED);
 394                 break;
 395         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 396                 cdev->private->options.pgroup = 0;
 397                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 398                 break;
 399         default:
 400                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 401                 break;
 402         }
 403 }
 404
 405 /*
 406  * Start device recognition.
 407  */
 408 int
 409 ccw_device_recognition(struct ccw_device *cdev)
 410 {
 411         struct subchannel *sch;
 412         int ret;
 413
 414         if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
 415             (cdev->private->state != DEV_STATE_BOXED))
 416                 return -EINVAL;
 417         sch = to_subchannel(cdev->dev.parent);
 418         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 419         if (ret != 0)
 420                 /* Couldn't enable the subchannel for i/o. Sick device. */
 421                 return ret;
 422
 423         /* After 60s the device recognition is considered to have failed. */
 424         ccw_device_set_timeout(cdev, 60*HZ);
 425
 426         /*
 427          * We used to start here with a sense pgid to find out whether a device
 428          * is locked by someone else. Unfortunately, the sense pgid command
 429          * code has other meanings on devices predating the path grouping
 430          * algorithm, so we start with sense id and box the device after an
 431          * timeout (or if sense pgid during path verification detects the device
 432          * is locked, as may happen on newer devices).
 433          */
 434         cdev->private->flags.recog_done = 0;
 435         cdev->private->state = DEV_STATE_SENSE_ID;
 436         ccw_device_sense_id_start(cdev);
 437         return 0;
 438 }
 439
 440 /*
 441  * Handle timeout in device recognition.
 442  */
 443 static void
 444 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 445 {
 446         int ret;
 447
 448         ret = ccw_device_cancel_halt_clear(cdev);
 449         switch (ret) {
 450         case 0:
 451                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 452                 break;
 453         case -ENODEV:
 454                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 455                 break;
 456         default:
 457                 ccw_device_set_timeout(cdev, 3*HZ);
 458         }
 459 }
 460
 461
 462 static void
 463 ccw_device_nopath_notify(void *data)
 464 {
 465         struct ccw_device *cdev;
 466         struct subchannel *sch;
 467         int ret;
 468
 469         cdev = (struct ccw_device *)data;
 470         sch = to_subchannel(cdev->dev.parent);
 471         /* Extra sanity. */
 472         if (sch->lpm)
 473                 return;
 474         ret = (sch->driver && sch->driver->notify) ?
 475                 sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0;
 476         if (!ret) {
 477                 if (get_device(&sch->dev)) {
 478                         /* Driver doesn't want to keep device. */
 479                         cio_disable_subchannel(sch);
 480                         if (get_device(&cdev->dev)) {
 481                                 PREPARE_WORK(&cdev->private->kick_work,
 482                                              ccw_device_call_sch_unregister,
 483                                              (void *)cdev);
 484                                 queue_work(ccw_device_work,
 485                                            &cdev->private->kick_work);
 486                         } else
 487                                 put_device(&sch->dev);
 488                 }
 489         } else {
 490                 cio_disable_subchannel(sch);
 491                 ccw_device_set_timeout(cdev, 0);
 492                 cdev->private->flags.fake_irb = 0;
 493                 cdev->private->state = DEV_STATE_DISCONNECTED;
 494                 wake_up(&cdev->private->wait_q);
 495         }
 496 }
 497
 498 void
 499 ccw_device_verify_done(struct ccw_device *cdev, int err)
 500 {
 501         cdev->private->flags.doverify = 0;
 502         switch (err) {
 503         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 504                 cdev->private->options.pgroup = 0;
 505         case 0:
 506                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 507                 /* Deliver fake irb to device driver, if needed. */
 508                 if (cdev->private->flags.fake_irb) {
 509                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 510                         cdev->private->irb.scsw = (struct scsw) {
 511                                 .cc = 1,
 512                                 .fctl = SCSW_FCTL_START_FUNC,
 513                                 .actl = SCSW_ACTL_START_PEND,
 514                                 .stctl = SCSW_STCTL_STATUS_PEND,
 515                         };
 516                         cdev->private->flags.fake_irb = 0;
 517                         if (cdev->handler)
 518                                 cdev->handler(cdev, cdev->private->intparm,
 519                                               &cdev->private->irb);
 520                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 521                 }
 522                 break;
 523         case -ETIME:
 524                 ccw_device_done(cdev, DEV_STATE_BOXED);
 525                 break;
 526         default:
 527                 PREPARE_WORK(&cdev->private->kick_work,
 528                              ccw_device_nopath_notify, (void *)cdev);
 529                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 530                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 531                 break;
 532         }
 533 }
 534
 535 /*
 536  * Get device online.
 537  */
 538 int
 539 ccw_device_online(struct ccw_device *cdev)
 540 {
 541         struct subchannel *sch;
 542         int ret;
 543
 544         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 545             (cdev->private->state != DEV_STATE_BOXED))
 546                 return -EINVAL;
 547         sch = to_subchannel(cdev->dev.parent);
 548         if (css_init_done && !get_device(&cdev->dev))
 549                 return -ENODEV;
 550         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 551         if (ret != 0) {
 552                 /* Couldn't enable the subchannel for i/o. Sick device. */
 553                 if (ret == -ENODEV)
 554                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 555                 return ret;
 556         }
 557         /* Do we want to do path grouping? */
 558         if (!cdev->private->options.pgroup) {
 559                 /* No, set state online immediately. */
 560                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 561                 return 0;
 562         }
 563         /* Do a SensePGID first. */
 564         cdev->private->state = DEV_STATE_SENSE_PGID;
 565         ccw_device_sense_pgid_start(cdev);
 566         return 0;
 567 }
 568
 569 void
 570 ccw_device_disband_done(struct ccw_device *cdev, int err)
 571 {
 572         switch (err) {
 573         case 0:
 574                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 575                 break;
 576         case -ETIME:
 577                 ccw_device_done(cdev, DEV_STATE_BOXED);
 578                 break;
 579         default:
 580                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 581                 break;
 582         }
 583 }
 584
 585 /*
 586  * Shutdown device.
 587  */
 588 int
 589 ccw_device_offline(struct ccw_device *cdev)
 590 {
 591         struct subchannel *sch;
 592
 593         sch = to_subchannel(cdev->dev.parent);
 594         if (stsch(sch->irq, &sch->schib) || !sch->schib.pmcw.dnv)
 595                 return -ENODEV;
 596         if (cdev->private->state != DEV_STATE_ONLINE) {
 597                 if (sch->schib.scsw.actl != 0)
 598                         return -EBUSY;
 599                 return -EINVAL;
 600         }
 601         if (sch->schib.scsw.actl != 0)
 602                 return -EBUSY;
 603         /* Are we doing path grouping? */
 604         if (!cdev->private->options.pgroup) {
 605                 /* No, set state offline immediately. */
 606                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 607                 return 0;
 608         }
 609         /* Start Set Path Group commands. */
 610         cdev->private->state = DEV_STATE_DISBAND_PGID;
 611         ccw_device_disband_start(cdev);
 612         return 0;
 613 }
 614
 615 /*
 616  * Handle timeout in device online/offline process.
 617  */
 618 static void
 619 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 620 {
 621         int ret;
 622
 623         ret = ccw_device_cancel_halt_clear(cdev);
 624         switch (ret) {
 625         case 0:
 626                 ccw_device_done(cdev, DEV_STATE_BOXED);
 627                 break;
 628         case -ENODEV:
 629                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 630                 break;
 631         default:
 632                 ccw_device_set_timeout(cdev, 3*HZ);
 633         }
 634 }
 635
 636 /*
 637  * Handle not oper event in device recognition.
 638  */
 639 static void
 640 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 641 {
 642         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 643 }
 644
 645 /*
 646  * Handle not operational event while offline.
 647  */
 648 static void
 649 ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 650 {
 651         struct subchannel *sch;
 652
 653         cdev->private->state = DEV_STATE_NOT_OPER;
 654         sch = to_subchannel(cdev->dev.parent);
 655         if (get_device(&cdev->dev)) {
 656                 PREPARE_WORK(&cdev->private->kick_work,
 657                              ccw_device_call_sch_unregister, (void *)cdev);
 658                 queue_work(ccw_device_work, &cdev->private->kick_work);
 659         }
 660         wake_up(&cdev->private->wait_q);
 661 }
 662
 663 /*
 664  * Handle not operational event while online.
 665  */
 666 static void
 667 ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 668 {
 669         struct subchannel *sch;
 670
 671         sch = to_subchannel(cdev->dev.parent);
 672         if (sch->driver->notify &&
 673             sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) {
 674                         ccw_device_set_timeout(cdev, 0);
 675                         cdev->private->flags.fake_irb = 0;
 676                         cdev->private->state = DEV_STATE_DISCONNECTED;
 677                         wake_up(&cdev->private->wait_q);
 678                         return;
 679         }
 680         cdev->private->state = DEV_STATE_NOT_OPER;
 681         cio_disable_subchannel(sch);
 682         if (sch->schib.scsw.actl != 0) {
 683                 // FIXME: not-oper indication to device driver ?
 684                 ccw_device_call_handler(cdev);
 685         }
 686         if (get_device(&cdev->dev)) {
 687                 PREPARE_WORK(&cdev->private->kick_work,
 688                              ccw_device_call_sch_unregister, (void *)cdev);
 689                 queue_work(ccw_device_work, &cdev->private->kick_work);
 690         }
 691         wake_up(&cdev->private->wait_q);
 692 }
 693
 694 /*
 695  * Handle path verification event.
 696  */
 697 static void
 698 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 699 {
 700         struct subchannel *sch;
 701
 702         if (!cdev->private->options.pgroup)
 703                 return;
 704         if (cdev->private->state == DEV_STATE_W4SENSE) {
 705                 cdev->private->flags.doverify = 1;
 706                 return;
 707         }
 708         sch = to_subchannel(cdev->dev.parent);
 709         /*
 710          * Since we might not just be coming from an interrupt from the
 711          * subchannel we have to update the schib.
 712          */
 713         stsch(sch->irq, &sch->schib);
 714
 715         if (sch->schib.scsw.actl != 0 ||
 716             (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
 717                 /*
 718                  * No final status yet or final status not yet delivered
 719                  * to the device driver. Can't do path verfication now,
 720                  * delay until final status was delivered.
 721                  */
 722                 cdev->private->flags.doverify = 1;
 723                 return;
 724         }
 725         /* Device is idle, we can do the path verification. */
 726         cdev->private->state = DEV_STATE_VERIFY;
 727         ccw_device_verify_start(cdev);
 728 }
 729
 730 /*
 731  * Got an interrupt for a normal io (state online).
 732  */
 733 static void
 734 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 735 {
 736         struct irb *irb;
 737
 738         irb = (struct irb *) __LC_IRB;
 739         /* Check for unsolicited interrupt. */
 740         if ((irb->scsw.stctl ==
 741                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
 742             && (!irb->scsw.cc)) {
 743                 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 744                     !irb->esw.esw0.erw.cons) {
 745                         /* Unit check but no sense data. Need basic sense. */
 746                         if (ccw_device_do_sense(cdev, irb) != 0)
 747                                 goto call_handler_unsol;
 748                         memcpy(irb, &cdev->private->irb, sizeof(struct irb));
 749                         cdev->private->state = DEV_STATE_W4SENSE;
 750                         cdev->private->intparm = 0;
 751                         return;
 752                 }
 753 call_handler_unsol:
 754                 if (cdev->handler)
 755                         cdev->handler (cdev, 0, irb);
 756                 return;
 757         }
 758         /* Accumulate status and find out if a basic sense is needed. */
 759         ccw_device_accumulate_irb(cdev, irb);
 760         if (cdev->private->flags.dosense) {
 761                 if (ccw_device_do_sense(cdev, irb) == 0) {
 762                         cdev->private->state = DEV_STATE_W4SENSE;
 763                 }
 764                 return;
 765         }
 766         /* Call the handler. */
 767         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 768                 /* Start delayed path verification. */
 769                 ccw_device_online_verify(cdev, 0);
 770 }
 771
 772 /*
 773  * Got an timeout in online state.
 774  */
 775 static void
 776 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 777 {
 778         int ret;
 779
 780         ccw_device_set_timeout(cdev, 0);
 781         ret = ccw_device_cancel_halt_clear(cdev);
 782         if (ret == -EBUSY) {
 783                 ccw_device_set_timeout(cdev, 3*HZ);
 784                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 785                 return;
 786         }
 787         if (ret == -ENODEV) {
 788                 struct subchannel *sch;
 789
 790                 sch = to_subchannel(cdev->dev.parent);
 791                 if (!sch->lpm) {
 792                         PREPARE_WORK(&cdev->private->kick_work,
 793                                      ccw_device_nopath_notify, (void *)cdev);
 794                         queue_work(ccw_device_notify_work,
 795                                    &cdev->private->kick_work);
 796                 } else
 797                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 798         } else if (cdev->handler)
 799                 cdev->handler(cdev, cdev->private->intparm,
 800                               ERR_PTR(-ETIMEDOUT));
 801 }
 802
 803 /*
 804  * Got an interrupt for a basic sense.
 805  */
 806 void
 807 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 808 {
 809         struct irb *irb;
 810
 811         irb = (struct irb *) __LC_IRB;
 812         /* Check for unsolicited interrupt. */
 813         if (irb->scsw.stctl ==
 814                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 815                 if (irb->scsw.cc == 1)
 816                         /* Basic sense hasn't started. Try again. */
 817                         ccw_device_do_sense(cdev, irb);
 818                 else {
 819                         printk("Huh? %s(%s): unsolicited interrupt...\n",
 820                                __FUNCTION__, cdev->dev.bus_id);
 821                         if (cdev->handler)
 822                                 cdev->handler (cdev, 0, irb);
 823                 }
 824                 return;
 825         }
 826         /* Add basic sense info to irb. */
 827         ccw_device_accumulate_basic_sense(cdev, irb);
 828         if (cdev->private->flags.dosense) {
 829                 /* Another basic sense is needed. */
 830                 ccw_device_do_sense(cdev, irb);
 831                 return;
 832         }
 833         cdev->private->state = DEV_STATE_ONLINE;
 834         /* Call the handler. */
 835         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 836                 /* Start delayed path verification. */
 837                 ccw_device_online_verify(cdev, 0);
 838 }
 839
 840 static void
 841 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 842 {
 843         struct irb *irb;
 844
 845         irb = (struct irb *) __LC_IRB;
 846         /* Accumulate status. We don't do basic sense. */
 847         ccw_device_accumulate_irb(cdev, irb);
 848         /* Try to start delayed device verification. */
 849         ccw_device_online_verify(cdev, 0);
 850         /* Note: Don't call handler for cio initiated clear! */
 851 }
 852
 853 static void
 854 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
 855 {
 856         struct subchannel *sch;
 857
 858         sch = to_subchannel(cdev->dev.parent);
 859         ccw_device_set_timeout(cdev, 0);
 860         /* OK, i/o is dead now. Call interrupt handler. */
 861         cdev->private->state = DEV_STATE_ONLINE;
 862         if (cdev->handler)
 863                 cdev->handler(cdev, cdev->private->intparm,
 864                               ERR_PTR(-ETIMEDOUT));
 865         if (!sch->lpm) {
 866                 PREPARE_WORK(&cdev->private->kick_work,
 867                              ccw_device_nopath_notify, (void *)cdev);
 868                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 869         } else if (cdev->private->flags.doverify)
 870                 /* Start delayed path verification. */
 871                 ccw_device_online_verify(cdev, 0);
 872 }
 873
 874 static void
 875 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 876 {
 877         int ret;
 878
 879         ret = ccw_device_cancel_halt_clear(cdev);
 880         if (ret == -EBUSY) {
 881                 ccw_device_set_timeout(cdev, 3*HZ);
 882                 return;
 883         }
 884         if (ret == -ENODEV) {
 885                 struct subchannel *sch;
 886
 887                 sch = to_subchannel(cdev->dev.parent);
 888                 if (!sch->lpm) {
 889                         PREPARE_WORK(&cdev->private->kick_work,
 890                                      ccw_device_nopath_notify, (void *)cdev);
 891                         queue_work(ccw_device_notify_work,
 892                                    &cdev->private->kick_work);
 893                 } else
 894                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 895                 return;
 896         }
 897         //FIXME: Can we get here?
 898         cdev->private->state = DEV_STATE_ONLINE;
 899         if (cdev->handler)
 900                 cdev->handler(cdev, cdev->private->intparm,
 901                               ERR_PTR(-ETIMEDOUT));
 902 }
 903
 904 static void
 905 ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event)
 906 {
 907         struct irb *irb;
 908         struct subchannel *sch;
 909
 910         irb = (struct irb *) __LC_IRB;
 911         /*
 912          * Accumulate status and find out if a basic sense is needed.
 913          * This is fine since we have already adapted the lpm.
 914          */
 915         ccw_device_accumulate_irb(cdev, irb);
 916         if (cdev->private->flags.dosense) {
 917                 if (ccw_device_do_sense(cdev, irb) == 0) {
 918                         cdev->private->state = DEV_STATE_W4SENSE;
 919                 }
 920                 return;
 921         }
 922
 923         /* Iff device is idle, reset timeout. */
 924         sch = to_subchannel(cdev->dev.parent);
 925         if (!stsch(sch->irq, &sch->schib))
 926                 if (sch->schib.scsw.actl == 0)
 927                         ccw_device_set_timeout(cdev, 0);
 928         /* Call the handler. */
 929         ccw_device_call_handler(cdev);
 930         if (!sch->lpm) {
 931                 PREPARE_WORK(&cdev->private->kick_work,
 932                              ccw_device_nopath_notify, (void *)cdev);
 933                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 934         } else if (cdev->private->flags.doverify)
 935                 ccw_device_online_verify(cdev, 0);
 936 }
 937
 938 static void
 939 ccw_device_wait4io_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 940 {
 941         int ret;
 942         struct subchannel *sch;
 943
 944         sch = to_subchannel(cdev->dev.parent);
 945         ccw_device_set_timeout(cdev, 0);
 946         ret = ccw_device_cancel_halt_clear(cdev);
 947         if (ret == -EBUSY) {
 948                 ccw_device_set_timeout(cdev, 3*HZ);
 949                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 950                 return;
 951         }
 952         if (ret == -ENODEV) {
 953                 if (!sch->lpm) {
 954                         PREPARE_WORK(&cdev->private->kick_work,
 955                                      ccw_device_nopath_notify, (void *)cdev);
 956                         queue_work(ccw_device_notify_work,
 957                                    &cdev->private->kick_work);
 958                 } else
 959                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 960                 return;
 961         }
 962         if (cdev->handler)
 963                 cdev->handler(cdev, cdev->private->intparm,
 964                               ERR_PTR(-ETIMEDOUT));
 965         if (!sch->lpm) {
 966                 PREPARE_WORK(&cdev->private->kick_work,
 967                              ccw_device_nopath_notify, (void *)cdev);
 968                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 969         } else if (cdev->private->flags.doverify)
 970                 /* Start delayed path verification. */
 971                 ccw_device_online_verify(cdev, 0);
 972 }
 973
 974 static void
 975 ccw_device_wait4io_verify(struct ccw_device *cdev, enum dev_event dev_event)
 976 {
 977         /* When the I/O has terminated, we have to start verification. */
 978         if (cdev->private->options.pgroup)
 979                 cdev->private->flags.doverify = 1;
 980 }
 981
 982 static void
 983 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
 984 {
 985         struct irb *irb;
 986
 987         switch (dev_event) {
 988         case DEV_EVENT_INTERRUPT:
 989                 irb = (struct irb *) __LC_IRB;
 990                 /* Check for unsolicited interrupt. */
 991                 if ((irb->scsw.stctl ==
 992                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
 993                     (!irb->scsw.cc))
 994                         /* FIXME: we should restart stlck here, but this
 995                          * is extremely unlikely ... */
 996                         goto out_wakeup;
 997
 998                 ccw_device_accumulate_irb(cdev, irb);
 999                 /* We don't care about basic sense etc. */
1000                 break;
1001         default: /* timeout */
1002                 break;
1003         }
1004 out_wakeup:
1005         wake_up(&cdev->private->wait_q);
1006 }
1007
1008 static void
1009 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1010 {
1011         struct subchannel *sch;
1012
1013         sch = to_subchannel(cdev->dev.parent);
1014         if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1015                 /* Couldn't enable the subchannel for i/o. Sick device. */
1016                 return;
1017
1018         /* After 60s the device recognition is considered to have failed. */
1019         ccw_device_set_timeout(cdev, 60*HZ);
1020
1021         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1022         ccw_device_sense_id_start(cdev);
1023 }
1024
1025 void
1026 device_trigger_reprobe(struct subchannel *sch)
1027 {
1028         struct ccw_device *cdev;
1029
1030         if (!sch->dev.driver_data)
1031                 return;
1032         cdev = sch->dev.driver_data;
1033         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1034                 return;
1035
1036         /* Update some values. */
1037         if (stsch(sch->irq, &sch->schib))
1038                 return;
1039
1040         /*
1041          * The pim, pam, pom values may not be accurate, but they are the best
1042          * we have before performing device selection :/
1043          */
1044         sch->lpm = sch->schib.pmcw.pim &
1045                 sch->schib.pmcw.pam &
1046                 sch->schib.pmcw.pom &
1047                 sch->opm;
1048         /* Re-set some bits in the pmcw that were lost. */
1049         sch->schib.pmcw.isc = 3;
1050         sch->schib.pmcw.csense = 1;
1051         sch->schib.pmcw.ena = 0;
1052         if ((sch->lpm & (sch->lpm - 1)) != 0)
1053                 sch->schib.pmcw.mp = 1;
1054         sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1055         /* We should also udate ssd info, but this has to wait. */
1056         ccw_device_start_id(cdev, 0);
1057 }
1058
1059 static void
1060 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1061 {
1062         struct subchannel *sch;
1063
1064         sch = to_subchannel(cdev->dev.parent);
1065         /*
1066          * An interrupt in state offline means a previous disable was not
1067          * successful. Try again.
1068          */
1069         cio_disable_subchannel(sch);
1070 }
1071
1072 static void
1073 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1074 {
1075         retry_set_schib(cdev);
1076         cdev->private->state = DEV_STATE_ONLINE;
1077         dev_fsm_event(cdev, dev_event);
1078 }
1079
1080
1081 static void
1082 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1083 {
1084         ccw_device_set_timeout(cdev, 0);
1085         if (dev_event == DEV_EVENT_NOTOPER)
1086                 cdev->private->state = DEV_STATE_NOT_OPER;
1087         else
1088                 cdev->private->state = DEV_STATE_OFFLINE;
1089         wake_up(&cdev->private->wait_q);
1090 }
1091
1092 static void
1093 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1094 {
1095         int ret;
1096
1097         ret = ccw_device_cancel_halt_clear(cdev);
1098         switch (ret) {
1099         case 0:
1100                 cdev->private->state = DEV_STATE_OFFLINE;
1101                 wake_up(&cdev->private->wait_q);
1102                 break;
1103         case -ENODEV:
1104                 cdev->private->state = DEV_STATE_NOT_OPER;
1105                 wake_up(&cdev->private->wait_q);
1106                 break;
1107         default:
1108                 ccw_device_set_timeout(cdev, HZ/10);
1109         }
1110 }
1111
1112 /*
1113  * No operation action. This is used e.g. to ignore a timeout event in
1114  * state offline.
1115  */
1116 static void
1117 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1118 {
1119 }
1120
1121 /*
1122  * Bug operation action.
1123  */
1124 static void
1125 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1126 {
1127         printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
1128                cdev->private->state, dev_event);
1129         BUG();
1130 }
1131
1132 /*
1133  * device statemachine
1134  */
1135 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1136         [DEV_STATE_NOT_OPER] = {
1137                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1138                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1139                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1140                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1141         },
1142         [DEV_STATE_SENSE_PGID] = {
1143                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1144                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1145                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1146                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1147         },
1148         [DEV_STATE_SENSE_ID] = {
1149                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1150                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1151                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1152                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1153         },
1154         [DEV_STATE_OFFLINE] = {
1155                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1156                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1157                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1158                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1159         },
1160         [DEV_STATE_VERIFY] = {
1161                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1162                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1163                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1164                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1165         },
1166         [DEV_STATE_ONLINE] = {
1167                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1168                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1169                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1170                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1171         },
1172         [DEV_STATE_W4SENSE] = {
1173                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1174                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1175                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1176                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1177         },
1178         [DEV_STATE_DISBAND_PGID] = {
1179                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1180                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1181                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1182                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1183         },
1184         [DEV_STATE_BOXED] = {
1185                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1186                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1187                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1188                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1189         },
1190         /* states to wait for i/o completion before doing something */
1191         [DEV_STATE_CLEAR_VERIFY] = {
1192                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1193                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1194                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1195                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1196         },
1197         [DEV_STATE_TIMEOUT_KILL] = {
1198                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1199                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1200                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1201                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1202         },
1203         [DEV_STATE_WAIT4IO] = {
1204                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1205                 [DEV_EVENT_INTERRUPT]   = ccw_device_wait4io_irq,
1206                 [DEV_EVENT_TIMEOUT]     = ccw_device_wait4io_timeout,
1207                 [DEV_EVENT_VERIFY]      = ccw_device_wait4io_verify,
1208         },
1209         [DEV_STATE_QUIESCE] = {
1210                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1211                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1212                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1213                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1214         },
1215         /* special states for devices gone not operational */
1216         [DEV_STATE_DISCONNECTED] = {
1217                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1218                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1219                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1220                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1221         },
1222         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1223                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1224                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1225                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1226                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1227         },
1228         [DEV_STATE_CMFCHANGE] = {
1229                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1230                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1231                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1232                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1233         },
1234 };
1235
1236 /*
1237  * io_subchannel_irq is called for "real" interrupts or for status
1238  * pending conditions on msch.
1239  */
1240 void
1241 io_subchannel_irq (struct device *pdev)
1242 {
1243         struct ccw_device *cdev;
1244
1245         cdev = to_subchannel(pdev)->dev.driver_data;
1246
1247         CIO_TRACE_EVENT (3, "IRQ");
1248         CIO_TRACE_EVENT (3, pdev->bus_id);
1249         if (cdev)
1250                 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1251 }
1252
1253 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);