drivers/s390/cio/device_fsm.c

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