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