drivers/s390/cio/device_fsm.c

   1 /*
   2  * drivers/s390/cio/device_fsm.c
   3  * finite state machine for device handling
   4  *
   5  *    Copyright IBM Corp. 2002,2008
   6  *    Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
   7  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/jiffies.h>
  13 #include <linux/string.h>
  14
  15 #include <asm/ccwdev.h>
  16 #include <asm/cio.h>
  17 #include <asm/chpid.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 #include "chp.h"
  26
  27 static int timeout_log_enabled;
  28
  29 static int __init ccw_timeout_log_setup(char *unused)
  30 {
  31         timeout_log_enabled = 1;
  32         return 1;
  33 }
  34
  35 __setup("ccw_timeout_log", ccw_timeout_log_setup);
  36
  37 static void ccw_timeout_log(struct ccw_device *cdev)
  38 {
  39         struct schib schib;
  40         struct subchannel *sch;
  41         struct io_subchannel_private *private;
  42         union orb *orb;
  43         int cc;
  44
  45         sch = to_subchannel(cdev->dev.parent);
  46         private = to_io_private(sch);
  47         orb = &private->orb;
  48         cc = stsch(sch->schid, &schib);
  49
  50         printk(KERN_WARNING "cio: ccw device timeout occurred at %llx, "
  51                "device information:\n", get_clock());
  52         printk(KERN_WARNING "cio: orb:\n");
  53         print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
  54                        orb, sizeof(*orb), 0);
  55         printk(KERN_WARNING "cio: ccw device bus id: %s\n",
  56                dev_name(&cdev->dev));
  57         printk(KERN_WARNING "cio: subchannel bus id: %s\n",
  58                dev_name(&sch->dev));
  59         printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, "
  60                "vpm: %02x\n", sch->lpm, sch->opm, sch->vpm);
  61
  62         if (orb->tm.b) {
  63                 printk(KERN_WARNING "cio: orb indicates transport mode\n");
  64                 printk(KERN_WARNING "cio: last tcw:\n");
  65                 print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
  66                                (void *)(addr_t)orb->tm.tcw,
  67                                sizeof(struct tcw), 0);
  68         } else {
  69                 printk(KERN_WARNING "cio: orb indicates command mode\n");
  70                 if ((void *)(addr_t)orb->cmd.cpa == &private->sense_ccw ||
  71                     (void *)(addr_t)orb->cmd.cpa == cdev->private->iccws)
  72                         printk(KERN_WARNING "cio: last channel program "
  73                                "(intern):\n");
  74                 else
  75                         printk(KERN_WARNING "cio: last channel program:\n");
  76
  77                 print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
  78                                (void *)(addr_t)orb->cmd.cpa,
  79                                sizeof(struct ccw1), 0);
  80         }
  81         printk(KERN_WARNING "cio: ccw device state: %d\n",
  82                cdev->private->state);
  83         printk(KERN_WARNING "cio: store subchannel returned: cc=%d\n", cc);
  84         printk(KERN_WARNING "cio: schib:\n");
  85         print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
  86                        &schib, sizeof(schib), 0);
  87         printk(KERN_WARNING "cio: ccw device flags:\n");
  88         print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
  89                        &cdev->private->flags, sizeof(cdev->private->flags), 0);
  90 }
  91
  92 /*
  93  * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
  94  */
  95 static void
  96 ccw_device_timeout(unsigned long data)
  97 {
  98         struct ccw_device *cdev;
  99
 100         cdev = (struct ccw_device *) data;
 101         spin_lock_irq(cdev->ccwlock);
 102         if (timeout_log_enabled)
 103                 ccw_timeout_log(cdev);
 104         dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
 105         spin_unlock_irq(cdev->ccwlock);
 106 }
 107
 108 /*
 109  * Set timeout
 110  */
 111 void
 112 ccw_device_set_timeout(struct ccw_device *cdev, int expires)
 113 {
 114         if (expires == 0) {
 115                 del_timer(&cdev->private->timer);
 116                 return;
 117         }
 118         if (timer_pending(&cdev->private->timer)) {
 119                 if (mod_timer(&cdev->private->timer, jiffies + expires))
 120                         return;
 121         }
 122         cdev->private->timer.function = ccw_device_timeout;
 123         cdev->private->timer.data = (unsigned long) cdev;
 124         cdev->private->timer.expires = jiffies + expires;
 125         add_timer(&cdev->private->timer);
 126 }
 127
 128 /*
 129  * Cancel running i/o. This is called repeatedly since halt/clear are
 130  * asynchronous operations. We do one try with cio_cancel, two tries
 131  * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
 132  * Returns 0 if device now idle, -ENODEV for device not operational and
 133  * -EBUSY if an interrupt is expected (either from halt/clear or from a
 134  * status pending).
 135  */
 136 int
 137 ccw_device_cancel_halt_clear(struct ccw_device *cdev)
 138 {
 139         struct subchannel *sch;
 140         int ret;
 141
 142         sch = to_subchannel(cdev->dev.parent);
 143         if (cio_update_schib(sch))
 144                 return -ENODEV;
 145         if (!sch->schib.pmcw.ena)
 146                 /* Not operational -> done. */
 147                 return 0;
 148         /* Stage 1: cancel io. */
 149         if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) &&
 150             !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
 151                 if (!scsw_is_tm(&sch->schib.scsw)) {
 152                         ret = cio_cancel(sch);
 153                         if (ret != -EINVAL)
 154                                 return ret;
 155                 }
 156                 /* cancel io unsuccessful or not applicable (transport mode).
 157                  * Continue with asynchronous instructions. */
 158                 cdev->private->iretry = 3;      /* 3 halt retries. */
 159         }
 160         if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
 161                 /* Stage 2: halt io. */
 162                 if (cdev->private->iretry) {
 163                         cdev->private->iretry--;
 164                         ret = cio_halt(sch);
 165                         if (ret != -EBUSY)
 166                                 return (ret == 0) ? -EBUSY : ret;
 167                 }
 168                 /* halt io unsuccessful. */
 169                 cdev->private->iretry = 255;    /* 255 clear retries. */
 170         }
 171         /* Stage 3: clear io. */
 172         if (cdev->private->iretry) {
 173                 cdev->private->iretry--;
 174                 ret = cio_clear (sch);
 175                 return (ret == 0) ? -EBUSY : ret;
 176         }
 177         panic("Can't stop i/o on subchannel.\n");
 178 }
 179
 180 static int
 181 ccw_device_handle_oper(struct ccw_device *cdev)
 182 {
 183         struct subchannel *sch;
 184
 185         sch = to_subchannel(cdev->dev.parent);
 186         cdev->private->flags.recog_done = 1;
 187         /*
 188          * Check if cu type and device type still match. If
 189          * not, it is certainly another device and we have to
 190          * de- and re-register.
 191          */
 192         if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
 193             cdev->id.cu_model != cdev->private->senseid.cu_model ||
 194             cdev->id.dev_type != cdev->private->senseid.dev_type ||
 195             cdev->id.dev_model != cdev->private->senseid.dev_model) {
 196                 PREPARE_WORK(&cdev->private->kick_work,
 197                              ccw_device_do_unbind_bind);
 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 void
 211 __recover_lost_chpids(struct subchannel *sch, int old_lpm)
 212 {
 213         int mask, i;
 214         struct chp_id chpid;
 215
 216         chp_id_init(&chpid);
 217         for (i = 0; i<8; i++) {
 218                 mask = 0x80 >> i;
 219                 if (!(sch->lpm & mask))
 220                         continue;
 221                 if (old_lpm & mask)
 222                         continue;
 223                 chpid.id = sch->schib.pmcw.chpid[i];
 224                 if (!chp_is_registered(chpid))
 225                         css_schedule_eval_all();
 226         }
 227 }
 228
 229 /*
 230  * Stop device recognition.
 231  */
 232 static void
 233 ccw_device_recog_done(struct ccw_device *cdev, int state)
 234 {
 235         struct subchannel *sch;
 236         int notify, old_lpm, same_dev;
 237
 238         sch = to_subchannel(cdev->dev.parent);
 239
 240         ccw_device_set_timeout(cdev, 0);
 241         cio_disable_subchannel(sch);
 242         /*
 243          * Now that we tried recognition, we have performed device selection
 244          * through ssch() and the path information is up to date.
 245          */
 246         old_lpm = sch->lpm;
 247
 248         /* Check since device may again have become not operational. */
 249         if (cio_update_schib(sch))
 250                 state = DEV_STATE_NOT_OPER;
 251         else
 252                 sch->lpm = sch->schib.pmcw.pam & sch->opm;
 253
 254         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
 255                 /* Force reprobe on all chpids. */
 256                 old_lpm = 0;
 257         if (sch->lpm != old_lpm)
 258                 __recover_lost_chpids(sch, old_lpm);
 259         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 260                 if (state == DEV_STATE_NOT_OPER) {
 261                         cdev->private->flags.recog_done = 1;
 262                         cdev->private->state = DEV_STATE_DISCONNECTED;
 263                         return;
 264                 }
 265                 /* Boxed devices don't need extra treatment. */
 266         }
 267         notify = 0;
 268         same_dev = 0; /* Keep the compiler quiet... */
 269         switch (state) {
 270         case DEV_STATE_NOT_OPER:
 271                 CIO_MSG_EVENT(2, "SenseID : unknown device %04x on "
 272                               "subchannel 0.%x.%04x\n",
 273                               cdev->private->dev_id.devno,
 274                               sch->schid.ssid, sch->schid.sch_no);
 275                 break;
 276         case DEV_STATE_OFFLINE:
 277                 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 278                         same_dev = ccw_device_handle_oper(cdev);
 279                         notify = 1;
 280                 }
 281                 /* fill out sense information */
 282                 memset(&cdev->id, 0, sizeof(cdev->id));
 283                 cdev->id.cu_type   = cdev->private->senseid.cu_type;
 284                 cdev->id.cu_model  = cdev->private->senseid.cu_model;
 285                 cdev->id.dev_type  = cdev->private->senseid.dev_type;
 286                 cdev->id.dev_model = cdev->private->senseid.dev_model;
 287                 if (notify) {
 288                         cdev->private->state = DEV_STATE_OFFLINE;
 289                         if (same_dev) {
 290                                 /* Get device online again. */
 291                                 ccw_device_online(cdev);
 292                                 wake_up(&cdev->private->wait_q);
 293                         }
 294                         return;
 295                 }
 296                 /* Issue device info message. */
 297                 CIO_MSG_EVENT(4, "SenseID : device 0.%x.%04x reports: "
 298                               "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
 299                               "%04X/%02X\n",
 300                               cdev->private->dev_id.ssid,
 301                               cdev->private->dev_id.devno,
 302                               cdev->id.cu_type, cdev->id.cu_model,
 303                               cdev->id.dev_type, cdev->id.dev_model);
 304                 break;
 305         case DEV_STATE_BOXED:
 306                 CIO_MSG_EVENT(0, "SenseID : boxed device %04x on "
 307                               " subchannel 0.%x.%04x\n",
 308                               cdev->private->dev_id.devno,
 309                               sch->schid.ssid, sch->schid.sch_no);
 310                 break;
 311         }
 312         cdev->private->state = state;
 313         io_subchannel_recog_done(cdev);
 314         if (state != DEV_STATE_NOT_OPER)
 315                 wake_up(&cdev->private->wait_q);
 316 }
 317
 318 /*
 319  * Function called from device_id.c after sense id has completed.
 320  */
 321 void
 322 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
 323 {
 324         switch (err) {
 325         case 0:
 326                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
 327                 break;
 328         case -ETIME:            /* Sense id stopped by timeout. */
 329                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 330                 break;
 331         default:
 332                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 333                 break;
 334         }
 335 }
 336
 337 int ccw_device_notify(struct ccw_device *cdev, int event)
 338 {
 339         if (!cdev->drv)
 340                 return 0;
 341         if (!cdev->online)
 342                 return 0;
 343         CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n",
 344                       cdev->private->dev_id.ssid, cdev->private->dev_id.devno,
 345                       event);
 346         return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0;
 347 }
 348
 349 static void cmf_reenable_delayed(struct work_struct *work)
 350 {
 351         struct ccw_device_private *priv;
 352         struct ccw_device *cdev;
 353
 354         priv = container_of(work, struct ccw_device_private, kick_work);
 355         cdev = priv->cdev;
 356         cmf_reenable(cdev);
 357 }
 358
 359 static void ccw_device_oper_notify(struct ccw_device *cdev)
 360 {
 361         if (ccw_device_notify(cdev, CIO_OPER)) {
 362                 /* Reenable channel measurements, if needed. */
 363                 PREPARE_WORK(&cdev->private->kick_work, cmf_reenable_delayed);
 364                 queue_work(ccw_device_work, &cdev->private->kick_work);
 365                 return;
 366         }
 367         /* Driver doesn't want device back. */
 368         ccw_device_set_notoper(cdev);
 369         PREPARE_WORK(&cdev->private->kick_work, ccw_device_do_unbind_bind);
 370         queue_work(ccw_device_work, &cdev->private->kick_work);
 371 }
 372
 373 /*
 374  * Finished with online/offline processing.
 375  */
 376 static void
 377 ccw_device_done(struct ccw_device *cdev, int state)
 378 {
 379         struct subchannel *sch;
 380
 381         sch = to_subchannel(cdev->dev.parent);
 382
 383         ccw_device_set_timeout(cdev, 0);
 384
 385         if (state != DEV_STATE_ONLINE)
 386                 cio_disable_subchannel(sch);
 387
 388         /* Reset device status. */
 389         memset(&cdev->private->irb, 0, sizeof(struct irb));
 390
 391         cdev->private->state = state;
 392
 393
 394         if (state == DEV_STATE_BOXED)
 395                 CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n",
 396                               cdev->private->dev_id.devno, sch->schid.sch_no);
 397
 398         if (cdev->private->flags.donotify) {
 399                 cdev->private->flags.donotify = 0;
 400                 ccw_device_oper_notify(cdev);
 401         }
 402         wake_up(&cdev->private->wait_q);
 403 }
 404
 405 static int cmp_pgid(struct pgid *p1, struct pgid *p2)
 406 {
 407         char *c1;
 408         char *c2;
 409
 410         c1 = (char *)p1;
 411         c2 = (char *)p2;
 412
 413         return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
 414 }
 415
 416 static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
 417 {
 418         int i;
 419         int last;
 420
 421         last = 0;
 422         for (i = 0; i < 8; i++) {
 423                 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
 424                         /* No PGID yet */
 425                         continue;
 426                 if (cdev->private->pgid[last].inf.ps.state1 ==
 427                     SNID_STATE1_RESET) {
 428                         /* First non-zero PGID */
 429                         last = i;
 430                         continue;
 431                 }
 432                 if (cmp_pgid(&cdev->private->pgid[i],
 433                              &cdev->private->pgid[last]) == 0)
 434                         /* Non-conflicting PGIDs */
 435                         continue;
 436
 437                 /* PGID mismatch, can't pathgroup. */
 438                 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
 439                               "0.%x.%04x, can't pathgroup\n",
 440                               cdev->private->dev_id.ssid,
 441                               cdev->private->dev_id.devno);
 442                 cdev->private->options.pgroup = 0;
 443                 return;
 444         }
 445         if (cdev->private->pgid[last].inf.ps.state1 ==
 446             SNID_STATE1_RESET)
 447                 /* No previous pgid found */
 448                 memcpy(&cdev->private->pgid[0],
 449                        &channel_subsystems[0]->global_pgid,
 450                        sizeof(struct pgid));
 451         else
 452                 /* Use existing pgid */
 453                 memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
 454                        sizeof(struct pgid));
 455 }
 456
 457 /*
 458  * Function called from device_pgid.c after sense path ground has completed.
 459  */
 460 void
 461 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
 462 {
 463         struct subchannel *sch;
 464
 465         sch = to_subchannel(cdev->dev.parent);
 466         switch (err) {
 467         case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
 468                 cdev->private->options.pgroup = 0;
 469                 break;
 470         case 0: /* success */
 471         case -EACCES: /* partial success, some paths not operational */
 472                 /* Check if all pgids are equal or 0. */
 473                 __ccw_device_get_common_pgid(cdev);
 474                 break;
 475         case -ETIME:            /* Sense path group id stopped by timeout. */
 476         case -EUSERS:           /* device is reserved for someone else. */
 477                 ccw_device_done(cdev, DEV_STATE_BOXED);
 478                 return;
 479         default:
 480                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 481                 return;
 482         }
 483         /* Start Path Group verification. */
 484         cdev->private->state = DEV_STATE_VERIFY;
 485         cdev->private->flags.doverify = 0;
 486         ccw_device_verify_start(cdev);
 487 }
 488
 489 /*
 490  * Start device recognition.
 491  */
 492 int
 493 ccw_device_recognition(struct ccw_device *cdev)
 494 {
 495         struct subchannel *sch;
 496         int ret;
 497
 498         if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
 499             (cdev->private->state != DEV_STATE_BOXED))
 500                 return -EINVAL;
 501         sch = to_subchannel(cdev->dev.parent);
 502         ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
 503         if (ret != 0)
 504                 /* Couldn't enable the subchannel for i/o. Sick device. */
 505                 return ret;
 506
 507         /* After 60s the device recognition is considered to have failed. */
 508         ccw_device_set_timeout(cdev, 60*HZ);
 509
 510         /*
 511          * We used to start here with a sense pgid to find out whether a device
 512          * is locked by someone else. Unfortunately, the sense pgid command
 513          * code has other meanings on devices predating the path grouping
 514          * algorithm, so we start with sense id and box the device after an
 515          * timeout (or if sense pgid during path verification detects the device
 516          * is locked, as may happen on newer devices).
 517          */
 518         cdev->private->flags.recog_done = 0;
 519         cdev->private->state = DEV_STATE_SENSE_ID;
 520         ccw_device_sense_id_start(cdev);
 521         return 0;
 522 }
 523
 524 /*
 525  * Handle timeout in device recognition.
 526  */
 527 static void
 528 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 529 {
 530         int ret;
 531
 532         ret = ccw_device_cancel_halt_clear(cdev);
 533         switch (ret) {
 534         case 0:
 535                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 536                 break;
 537         case -ENODEV:
 538                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 539                 break;
 540         default:
 541                 ccw_device_set_timeout(cdev, 3*HZ);
 542         }
 543 }
 544
 545
 546 void
 547 ccw_device_verify_done(struct ccw_device *cdev, int err)
 548 {
 549         struct subchannel *sch;
 550
 551         sch = to_subchannel(cdev->dev.parent);
 552         /* Update schib - pom may have changed. */
 553         if (cio_update_schib(sch)) {
 554                 cdev->private->flags.donotify = 0;
 555                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 556                 return;
 557         }
 558         /* Update lpm with verified path mask. */
 559         sch->lpm = sch->vpm;
 560         /* Repeat path verification? */
 561         if (cdev->private->flags.doverify) {
 562                 cdev->private->flags.doverify = 0;
 563                 ccw_device_verify_start(cdev);
 564                 return;
 565         }
 566         switch (err) {
 567         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 568                 cdev->private->options.pgroup = 0;
 569         case 0:
 570                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 571                 /* Deliver fake irb to device driver, if needed. */
 572                 if (cdev->private->flags.fake_irb) {
 573                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 574                         cdev->private->irb.scsw.cmd.cc = 1;
 575                         cdev->private->irb.scsw.cmd.fctl = SCSW_FCTL_START_FUNC;
 576                         cdev->private->irb.scsw.cmd.actl = SCSW_ACTL_START_PEND;
 577                         cdev->private->irb.scsw.cmd.stctl =
 578                                 SCSW_STCTL_STATUS_PEND;
 579                         cdev->private->flags.fake_irb = 0;
 580                         if (cdev->handler)
 581                                 cdev->handler(cdev, cdev->private->intparm,
 582                                               &cdev->private->irb);
 583                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 584                 }
 585                 break;
 586         case -ETIME:
 587                 /* Reset oper notify indication after verify error. */
 588                 cdev->private->flags.donotify = 0;
 589                 ccw_device_done(cdev, DEV_STATE_BOXED);
 590                 break;
 591         default:
 592                 /* Reset oper notify indication after verify error. */
 593                 cdev->private->flags.donotify = 0;
 594                 if (cdev->online) {
 595                         ccw_device_set_timeout(cdev, 0);
 596                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 597                 } else
 598                         ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 599                 break;
 600         }
 601 }
 602
 603 /*
 604  * Get device online.
 605  */
 606 int
 607 ccw_device_online(struct ccw_device *cdev)
 608 {
 609         struct subchannel *sch;
 610         int ret;
 611
 612         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 613             (cdev->private->state != DEV_STATE_BOXED))
 614                 return -EINVAL;
 615         sch = to_subchannel(cdev->dev.parent);
 616         ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
 617         if (ret != 0) {
 618                 /* Couldn't enable the subchannel for i/o. Sick device. */
 619                 if (ret == -ENODEV)
 620                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 621                 return ret;
 622         }
 623         /* Do we want to do path grouping? */
 624         if (!cdev->private->options.pgroup) {
 625                 /* Start initial path verification. */
 626                 cdev->private->state = DEV_STATE_VERIFY;
 627                 cdev->private->flags.doverify = 0;
 628                 ccw_device_verify_start(cdev);
 629                 return 0;
 630         }
 631         /* Do a SensePGID first. */
 632         cdev->private->state = DEV_STATE_SENSE_PGID;
 633         ccw_device_sense_pgid_start(cdev);
 634         return 0;
 635 }
 636
 637 void
 638 ccw_device_disband_done(struct ccw_device *cdev, int err)
 639 {
 640         switch (err) {
 641         case 0:
 642                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 643                 break;
 644         case -ETIME:
 645                 ccw_device_done(cdev, DEV_STATE_BOXED);
 646                 break;
 647         default:
 648                 cdev->private->flags.donotify = 0;
 649                 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 650                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 651                 break;
 652         }
 653 }
 654
 655 /*
 656  * Shutdown device.
 657  */
 658 int
 659 ccw_device_offline(struct ccw_device *cdev)
 660 {
 661         struct subchannel *sch;
 662
 663         /* Allow ccw_device_offline while disconnected. */
 664         if (cdev->private->state == DEV_STATE_DISCONNECTED ||
 665             cdev->private->state == DEV_STATE_NOT_OPER) {
 666                 cdev->private->flags.donotify = 0;
 667                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 668                 return 0;
 669         }
 670         if (ccw_device_is_orphan(cdev)) {
 671                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 672                 return 0;
 673         }
 674         sch = to_subchannel(cdev->dev.parent);
 675         if (cio_update_schib(sch))
 676                 return -ENODEV;
 677         if (scsw_actl(&sch->schib.scsw) != 0)
 678                 return -EBUSY;
 679         if (cdev->private->state != DEV_STATE_ONLINE)
 680                 return -EINVAL;
 681         /* Are we doing path grouping? */
 682         if (!cdev->private->options.pgroup) {
 683                 /* No, set state offline immediately. */
 684                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 685                 return 0;
 686         }
 687         /* Start Set Path Group commands. */
 688         cdev->private->state = DEV_STATE_DISBAND_PGID;
 689         ccw_device_disband_start(cdev);
 690         return 0;
 691 }
 692
 693 /*
 694  * Handle timeout in device online/offline process.
 695  */
 696 static void
 697 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 698 {
 699         int ret;
 700
 701         ret = ccw_device_cancel_halt_clear(cdev);
 702         switch (ret) {
 703         case 0:
 704                 ccw_device_done(cdev, DEV_STATE_BOXED);
 705                 break;
 706         case -ENODEV:
 707                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 708                 break;
 709         default:
 710                 ccw_device_set_timeout(cdev, 3*HZ);
 711         }
 712 }
 713
 714 /*
 715  * Handle not oper event in device recognition.
 716  */
 717 static void
 718 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 719 {
 720         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 721 }
 722
 723 /*
 724  * Handle not operational event in non-special state.
 725  */
 726 static void ccw_device_generic_notoper(struct ccw_device *cdev,
 727                                        enum dev_event dev_event)
 728 {
 729         struct subchannel *sch;
 730
 731         ccw_device_set_notoper(cdev);
 732         sch = to_subchannel(cdev->dev.parent);
 733         css_schedule_eval(sch->schid);
 734 }
 735
 736 /*
 737  * Handle path verification event.
 738  */
 739 static void
 740 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 741 {
 742         struct subchannel *sch;
 743
 744         if (cdev->private->state == DEV_STATE_W4SENSE) {
 745                 cdev->private->flags.doverify = 1;
 746                 return;
 747         }
 748         sch = to_subchannel(cdev->dev.parent);
 749         /*
 750          * Since we might not just be coming from an interrupt from the
 751          * subchannel we have to update the schib.
 752          */
 753         if (cio_update_schib(sch)) {
 754                 ccw_device_verify_done(cdev, -ENODEV);
 755                 return;
 756         }
 757
 758         if (scsw_actl(&sch->schib.scsw) != 0 ||
 759             (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) ||
 760             (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) {
 761                 /*
 762                  * No final status yet or final status not yet delivered
 763                  * to the device driver. Can't do path verfication now,
 764                  * delay until final status was delivered.
 765                  */
 766                 cdev->private->flags.doverify = 1;
 767                 return;
 768         }
 769         /* Device is idle, we can do the path verification. */
 770         cdev->private->state = DEV_STATE_VERIFY;
 771         cdev->private->flags.doverify = 0;
 772         ccw_device_verify_start(cdev);
 773 }
 774
 775 /*
 776  * Got an interrupt for a normal io (state online).
 777  */
 778 static void
 779 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 780 {
 781         struct irb *irb;
 782         int is_cmd;
 783
 784         irb = (struct irb *) __LC_IRB;
 785         is_cmd = !scsw_is_tm(&irb->scsw);
 786         /* Check for unsolicited interrupt. */
 787         if (!scsw_is_solicited(&irb->scsw)) {
 788                 if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
 789                     !irb->esw.esw0.erw.cons) {
 790                         /* Unit check but no sense data. Need basic sense. */
 791                         if (ccw_device_do_sense(cdev, irb) != 0)
 792                                 goto call_handler_unsol;
 793                         memcpy(&cdev->private->irb, irb, sizeof(struct irb));
 794                         cdev->private->state = DEV_STATE_W4SENSE;
 795                         cdev->private->intparm = 0;
 796                         return;
 797                 }
 798 call_handler_unsol:
 799                 if (cdev->handler)
 800                         cdev->handler (cdev, 0, irb);
 801                 if (cdev->private->flags.doverify)
 802                         ccw_device_online_verify(cdev, 0);
 803                 return;
 804         }
 805         /* Accumulate status and find out if a basic sense is needed. */
 806         ccw_device_accumulate_irb(cdev, irb);
 807         if (is_cmd && cdev->private->flags.dosense) {
 808                 if (ccw_device_do_sense(cdev, irb) == 0) {
 809                         cdev->private->state = DEV_STATE_W4SENSE;
 810                 }
 811                 return;
 812         }
 813         /* Call the handler. */
 814         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 815                 /* Start delayed path verification. */
 816                 ccw_device_online_verify(cdev, 0);
 817 }
 818
 819 /*
 820  * Got an timeout in online state.
 821  */
 822 static void
 823 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 824 {
 825         int ret;
 826
 827         ccw_device_set_timeout(cdev, 0);
 828         ret = ccw_device_cancel_halt_clear(cdev);
 829         if (ret == -EBUSY) {
 830                 ccw_device_set_timeout(cdev, 3*HZ);
 831                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 832                 return;
 833         }
 834         if (ret == -ENODEV)
 835                 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 836         else if (cdev->handler)
 837                 cdev->handler(cdev, cdev->private->intparm,
 838                               ERR_PTR(-ETIMEDOUT));
 839 }
 840
 841 /*
 842  * Got an interrupt for a basic sense.
 843  */
 844 static void
 845 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 846 {
 847         struct irb *irb;
 848
 849         irb = (struct irb *) __LC_IRB;
 850         /* Check for unsolicited interrupt. */
 851         if (scsw_stctl(&irb->scsw) ==
 852             (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 853                 if (scsw_cc(&irb->scsw) == 1)
 854                         /* Basic sense hasn't started. Try again. */
 855                         ccw_device_do_sense(cdev, irb);
 856                 else {
 857                         CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited "
 858                                       "interrupt during w4sense...\n",
 859                                       cdev->private->dev_id.ssid,
 860                                       cdev->private->dev_id.devno);
 861                         if (cdev->handler)
 862                                 cdev->handler (cdev, 0, irb);
 863                 }
 864                 return;
 865         }
 866         /*
 867          * Check if a halt or clear has been issued in the meanwhile. If yes,
 868          * only deliver the halt/clear interrupt to the device driver as if it
 869          * had killed the original request.
 870          */
 871         if (scsw_fctl(&irb->scsw) &
 872             (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
 873                 /* Retry Basic Sense if requested. */
 874                 if (cdev->private->flags.intretry) {
 875                         cdev->private->flags.intretry = 0;
 876                         ccw_device_do_sense(cdev, irb);
 877                         return;
 878                 }
 879                 cdev->private->flags.dosense = 0;
 880                 memset(&cdev->private->irb, 0, sizeof(struct irb));
 881                 ccw_device_accumulate_irb(cdev, irb);
 882                 goto call_handler;
 883         }
 884         /* Add basic sense info to irb. */
 885         ccw_device_accumulate_basic_sense(cdev, irb);
 886         if (cdev->private->flags.dosense) {
 887                 /* Another basic sense is needed. */
 888                 ccw_device_do_sense(cdev, irb);
 889                 return;
 890         }
 891 call_handler:
 892         cdev->private->state = DEV_STATE_ONLINE;
 893         /* Call the handler. */
 894         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 895                 /* Start delayed path verification. */
 896                 ccw_device_online_verify(cdev, 0);
 897 }
 898
 899 static void
 900 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 901 {
 902         struct irb *irb;
 903
 904         irb = (struct irb *) __LC_IRB;
 905         /* Accumulate status. We don't do basic sense. */
 906         ccw_device_accumulate_irb(cdev, irb);
 907         /* Remember to clear irb to avoid residuals. */
 908         memset(&cdev->private->irb, 0, sizeof(struct irb));
 909         /* Try to start delayed device verification. */
 910         ccw_device_online_verify(cdev, 0);
 911         /* Note: Don't call handler for cio initiated clear! */
 912 }
 913
 914 static void
 915 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
 916 {
 917         struct subchannel *sch;
 918
 919         sch = to_subchannel(cdev->dev.parent);
 920         ccw_device_set_timeout(cdev, 0);
 921         /* Start delayed path verification. */
 922         ccw_device_online_verify(cdev, 0);
 923         /* OK, i/o is dead now. Call interrupt handler. */
 924         if (cdev->handler)
 925                 cdev->handler(cdev, cdev->private->intparm,
 926                               ERR_PTR(-EIO));
 927 }
 928
 929 static void
 930 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 931 {
 932         int ret;
 933
 934         ret = ccw_device_cancel_halt_clear(cdev);
 935         if (ret == -EBUSY) {
 936                 ccw_device_set_timeout(cdev, 3*HZ);
 937                 return;
 938         }
 939         /* Start delayed path verification. */
 940         ccw_device_online_verify(cdev, 0);
 941         if (cdev->handler)
 942                 cdev->handler(cdev, cdev->private->intparm,
 943                               ERR_PTR(-EIO));
 944 }
 945
 946 void ccw_device_kill_io(struct ccw_device *cdev)
 947 {
 948         int ret;
 949
 950         ret = ccw_device_cancel_halt_clear(cdev);
 951         if (ret == -EBUSY) {
 952                 ccw_device_set_timeout(cdev, 3*HZ);
 953                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 954                 return;
 955         }
 956         /* Start delayed path verification. */
 957         ccw_device_online_verify(cdev, 0);
 958         if (cdev->handler)
 959                 cdev->handler(cdev, cdev->private->intparm,
 960                               ERR_PTR(-EIO));
 961 }
 962
 963 static void
 964 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
 965 {
 966         /* Start verification after current task finished. */
 967         cdev->private->flags.doverify = 1;
 968 }
 969
 970 static void
 971 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
 972 {
 973         struct irb *irb;
 974
 975         switch (dev_event) {
 976         case DEV_EVENT_INTERRUPT:
 977                 irb = (struct irb *) __LC_IRB;
 978                 /* Check for unsolicited interrupt. */
 979                 if ((scsw_stctl(&irb->scsw) ==
 980                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
 981                     (!scsw_cc(&irb->scsw)))
 982                         /* FIXME: we should restart stlck here, but this
 983                          * is extremely unlikely ... */
 984                         goto out_wakeup;
 985
 986                 ccw_device_accumulate_irb(cdev, irb);
 987                 /* We don't care about basic sense etc. */
 988                 break;
 989         default: /* timeout */
 990                 break;
 991         }
 992 out_wakeup:
 993         wake_up(&cdev->private->wait_q);
 994 }
 995
 996 static void
 997 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
 998 {
 999         struct subchannel *sch;
1000
1001         sch = to_subchannel(cdev->dev.parent);
1002         if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0)
1003                 /* Couldn't enable the subchannel for i/o. Sick device. */
1004                 return;
1005
1006         /* After 60s the device recognition is considered to have failed. */
1007         ccw_device_set_timeout(cdev, 60*HZ);
1008
1009         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1010         ccw_device_sense_id_start(cdev);
1011 }
1012
1013 void ccw_device_trigger_reprobe(struct ccw_device *cdev)
1014 {
1015         struct subchannel *sch;
1016
1017         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1018                 return;
1019
1020         sch = to_subchannel(cdev->dev.parent);
1021         /* Update some values. */
1022         if (cio_update_schib(sch))
1023                 return;
1024         /*
1025          * The pim, pam, pom values may not be accurate, but they are the best
1026          * we have before performing device selection :/
1027          */
1028         sch->lpm = sch->schib.pmcw.pam & sch->opm;
1029         /*
1030          * Use the initial configuration since we can't be shure that the old
1031          * paths are valid.
1032          */
1033         io_subchannel_init_config(sch);
1034         if (cio_commit_config(sch))
1035                 return;
1036
1037         /* We should also udate ssd info, but this has to wait. */
1038         /* Check if this is another device which appeared on the same sch. */
1039         if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1040                 PREPARE_WORK(&cdev->private->kick_work,
1041                              ccw_device_move_to_orphanage);
1042                 queue_work(slow_path_wq, &cdev->private->kick_work);
1043         } else
1044                 ccw_device_start_id(cdev, 0);
1045 }
1046
1047 static void
1048 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1049 {
1050         struct subchannel *sch;
1051
1052         sch = to_subchannel(cdev->dev.parent);
1053         /*
1054          * An interrupt in state offline means a previous disable was not
1055          * successful - should not happen, but we try to disable again.
1056          */
1057         cio_disable_subchannel(sch);
1058 }
1059
1060 static void
1061 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1062 {
1063         retry_set_schib(cdev);
1064         cdev->private->state = DEV_STATE_ONLINE;
1065         dev_fsm_event(cdev, dev_event);
1066 }
1067
1068 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1069                                        enum dev_event dev_event)
1070 {
1071         cmf_retry_copy_block(cdev);
1072         cdev->private->state = DEV_STATE_ONLINE;
1073         dev_fsm_event(cdev, dev_event);
1074 }
1075
1076 static void
1077 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1078 {
1079         ccw_device_set_timeout(cdev, 0);
1080         if (dev_event == DEV_EVENT_NOTOPER)
1081                 cdev->private->state = DEV_STATE_NOT_OPER;
1082         else
1083                 cdev->private->state = DEV_STATE_OFFLINE;
1084         wake_up(&cdev->private->wait_q);
1085 }
1086
1087 static void
1088 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1089 {
1090         int ret;
1091
1092         ret = ccw_device_cancel_halt_clear(cdev);
1093         switch (ret) {
1094         case 0:
1095                 cdev->private->state = DEV_STATE_OFFLINE;
1096                 wake_up(&cdev->private->wait_q);
1097                 break;
1098         case -ENODEV:
1099                 cdev->private->state = DEV_STATE_NOT_OPER;
1100                 wake_up(&cdev->private->wait_q);
1101                 break;
1102         default:
1103                 ccw_device_set_timeout(cdev, HZ/10);
1104         }
1105 }
1106
1107 /*
1108  * No operation action. This is used e.g. to ignore a timeout event in
1109  * state offline.
1110  */
1111 static void
1112 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1113 {
1114 }
1115
1116 /*
1117  * Bug operation action.
1118  */
1119 static void
1120 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1121 {
1122         CIO_MSG_EVENT(0, "Internal state [%i][%i] not handled for device "
1123                       "0.%x.%04x\n", cdev->private->state, dev_event,
1124                       cdev->private->dev_id.ssid,
1125                       cdev->private->dev_id.devno);
1126         BUG();
1127 }
1128
1129 /*
1130  * device statemachine
1131  */
1132 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1133         [DEV_STATE_NOT_OPER] = {
1134                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1135                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1136                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1137                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1138         },
1139         [DEV_STATE_SENSE_PGID] = {
1140                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1141                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1142                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1143                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1144         },
1145         [DEV_STATE_SENSE_ID] = {
1146                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1147                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1148                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1149                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1150         },
1151         [DEV_STATE_OFFLINE] = {
1152                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1153                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1154                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1155                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1156         },
1157         [DEV_STATE_VERIFY] = {
1158                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1159                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1160                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1161                 [DEV_EVENT_VERIFY]      = ccw_device_delay_verify,
1162         },
1163         [DEV_STATE_ONLINE] = {
1164                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1165                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1166                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1167                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1168         },
1169         [DEV_STATE_W4SENSE] = {
1170                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1171                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1172                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1173                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1174         },
1175         [DEV_STATE_DISBAND_PGID] = {
1176                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1177                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1178                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1179                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1180         },
1181         [DEV_STATE_BOXED] = {
1182                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1183                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1184                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1185                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1186         },
1187         /* states to wait for i/o completion before doing something */
1188         [DEV_STATE_CLEAR_VERIFY] = {
1189                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1190                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1191                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1192                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1193         },
1194         [DEV_STATE_TIMEOUT_KILL] = {
1195                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1196                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1197                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1198                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1199         },
1200         [DEV_STATE_QUIESCE] = {
1201                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1202                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1203                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1204                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1205         },
1206         /* special states for devices gone not operational */
1207         [DEV_STATE_DISCONNECTED] = {
1208                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1209                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1210                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1211                 [DEV_EVENT_VERIFY]      = ccw_device_start_id,
1212         },
1213         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1214                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1215                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1216                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1217                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1218         },
1219         [DEV_STATE_CMFCHANGE] = {
1220                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1221                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1222                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1223                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1224         },
1225         [DEV_STATE_CMFUPDATE] = {
1226                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1227                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1228                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1229                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1230         },
1231 };
1232
1233 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);