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

   1 /*
   2  * drivers/s390/cio/device_fsm.c
   3  * finite state machine for device handling
   4  *
   5  *    Copyright 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         ret = stsch(sch->schid, &sch->schib);
 144         if (ret || !sch->schib.pmcw.dnv)
 145                 return -ENODEV;
 146         if (!sch->schib.pmcw.ena)
 147                 /* Not operational -> done. */
 148                 return 0;
 149         /* Stage 1: cancel io. */
 150         if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) &&
 151             !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
 152                 if (!scsw_is_tm(&sch->schib.scsw)) {
 153                         ret = cio_cancel(sch);
 154                         if (ret != -EINVAL)
 155                                 return ret;
 156                 }
 157                 /* cancel io unsuccessful or not applicable (transport mode).
 158                  * Continue with asynchronous instructions. */
 159                 cdev->private->iretry = 3;      /* 3 halt retries. */
 160         }
 161         if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
 162                 /* Stage 2: halt io. */
 163                 if (cdev->private->iretry) {
 164                         cdev->private->iretry--;
 165                         ret = cio_halt(sch);
 166                         if (ret != -EBUSY)
 167                                 return (ret == 0) ? -EBUSY : ret;
 168                 }
 169                 /* halt io unsuccessful. */
 170                 cdev->private->iretry = 255;    /* 255 clear retries. */
 171         }
 172         /* Stage 3: clear io. */
 173         if (cdev->private->iretry) {
 174                 cdev->private->iretry--;
 175                 ret = cio_clear (sch);
 176                 return (ret == 0) ? -EBUSY : ret;
 177         }
 178         panic("Can't stop i/o on subchannel.\n");
 179 }
 180
 181 static int
 182 ccw_device_handle_oper(struct ccw_device *cdev)
 183 {
 184         struct subchannel *sch;
 185
 186         sch = to_subchannel(cdev->dev.parent);
 187         cdev->private->flags.recog_done = 1;
 188         /*
 189          * Check if cu type and device type still match. If
 190          * not, it is certainly another device and we have to
 191          * de- and re-register.
 192          */
 193         if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
 194             cdev->id.cu_model != cdev->private->senseid.cu_model ||
 195             cdev->id.dev_type != cdev->private->senseid.dev_type ||
 196             cdev->id.dev_model != cdev->private->senseid.dev_model) {
 197                 PREPARE_WORK(&cdev->private->kick_work,
 198                              ccw_device_do_unreg_rereg);
 199                 queue_work(ccw_device_work, &cdev->private->kick_work);
 200                 return 0;
 201         }
 202         cdev->private->flags.donotify = 1;
 203         return 1;
 204 }
 205
 206 /*
 207  * The machine won't give us any notification by machine check if a chpid has
 208  * been varied online on the SE so we have to find out by magic (i. e. driving
 209  * the channel subsystem to device selection and updating our path masks).
 210  */
 211 static void
 212 __recover_lost_chpids(struct subchannel *sch, int old_lpm)
 213 {
 214         int mask, i;
 215         struct chp_id chpid;
 216
 217         chp_id_init(&chpid);
 218         for (i = 0; i<8; i++) {
 219                 mask = 0x80 >> i;
 220                 if (!(sch->lpm & mask))
 221                         continue;
 222                 if (old_lpm & mask)
 223                         continue;
 224                 chpid.id = sch->schib.pmcw.chpid[i];
 225                 if (!chp_is_registered(chpid))
 226                         css_schedule_eval_all();
 227         }
 228 }
 229
 230 /*
 231  * Stop device recognition.
 232  */
 233 static void
 234 ccw_device_recog_done(struct ccw_device *cdev, int state)
 235 {
 236         struct subchannel *sch;
 237         int notify, old_lpm, same_dev;
 238
 239         sch = to_subchannel(cdev->dev.parent);
 240
 241         ccw_device_set_timeout(cdev, 0);
 242         cio_disable_subchannel(sch);
 243         /*
 244          * Now that we tried recognition, we have performed device selection
 245          * through ssch() and the path information is up to date.
 246          */
 247         old_lpm = sch->lpm;
 248         stsch(sch->schid, &sch->schib);
 249         sch->lpm = sch->schib.pmcw.pam & sch->opm;
 250         /* Check since device may again have become not operational. */
 251         if (!sch->schib.pmcw.dnv)
 252                 state = DEV_STATE_NOT_OPER;
 253         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
 254                 /* Force reprobe on all chpids. */
 255                 old_lpm = 0;
 256         if (sch->lpm != old_lpm)
 257                 __recover_lost_chpids(sch, old_lpm);
 258         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 259                 if (state == DEV_STATE_NOT_OPER) {
 260                         cdev->private->flags.recog_done = 1;
 261                         cdev->private->state = DEV_STATE_DISCONNECTED;
 262                         return;
 263                 }
 264                 /* Boxed devices don't need extra treatment. */
 265         }
 266         notify = 0;
 267         same_dev = 0; /* Keep the compiler quiet... */
 268         switch (state) {
 269         case DEV_STATE_NOT_OPER:
 270                 CIO_MSG_EVENT(2, "SenseID : unknown device %04x on "
 271                               "subchannel 0.%x.%04x\n",
 272                               cdev->private->dev_id.devno,
 273                               sch->schid.ssid, sch->schid.sch_no);
 274                 break;
 275         case DEV_STATE_OFFLINE:
 276                 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 277                         same_dev = ccw_device_handle_oper(cdev);
 278                         notify = 1;
 279                 }
 280                 /* fill out sense information */
 281                 memset(&cdev->id, 0, sizeof(cdev->id));
 282                 cdev->id.cu_type   = cdev->private->senseid.cu_type;
 283                 cdev->id.cu_model  = cdev->private->senseid.cu_model;
 284                 cdev->id.dev_type  = cdev->private->senseid.dev_type;
 285                 cdev->id.dev_model = cdev->private->senseid.dev_model;
 286                 if (notify) {
 287                         cdev->private->state = DEV_STATE_OFFLINE;
 288                         if (same_dev) {
 289                                 /* Get device online again. */
 290                                 ccw_device_online(cdev);
 291                                 wake_up(&cdev->private->wait_q);
 292                         }
 293                         return;
 294                 }
 295                 /* Issue device info message. */
 296                 CIO_MSG_EVENT(4, "SenseID : device 0.%x.%04x reports: "
 297                               "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
 298                               "%04X/%02X\n",
 299                               cdev->private->dev_id.ssid,
 300                               cdev->private->dev_id.devno,
 301                               cdev->id.cu_type, cdev->id.cu_model,
 302                               cdev->id.dev_type, cdev->id.dev_model);
 303                 break;
 304         case DEV_STATE_BOXED:
 305                 CIO_MSG_EVENT(0, "SenseID : boxed device %04x on "
 306                               " subchannel 0.%x.%04x\n",
 307                               cdev->private->dev_id.devno,
 308                               sch->schid.ssid, sch->schid.sch_no);
 309                 break;
 310         }
 311         cdev->private->state = state;
 312         io_subchannel_recog_done(cdev);
 313         if (state != DEV_STATE_NOT_OPER)
 314                 wake_up(&cdev->private->wait_q);
 315 }
 316
 317 /*
 318  * Function called from device_id.c after sense id has completed.
 319  */
 320 void
 321 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
 322 {
 323         switch (err) {
 324         case 0:
 325                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
 326                 break;
 327         case -ETIME:            /* Sense id stopped by timeout. */
 328                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 329                 break;
 330         default:
 331                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 332                 break;
 333         }
 334 }
 335
 336 int ccw_device_notify(struct ccw_device *cdev, int event)
 337 {
 338         if (!cdev->drv)
 339                 return 0;
 340         if (!cdev->online)
 341                 return 0;
 342         CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n",
 343                       cdev->private->dev_id.ssid, cdev->private->dev_id.devno,
 344                       event);
 345         return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0;
 346 }
 347
 348 static void cmf_reenable_delayed(struct work_struct *work)
 349 {
 350         struct ccw_device_private *priv;
 351         struct ccw_device *cdev;
 352
 353         priv = container_of(work, struct ccw_device_private, kick_work);
 354         cdev = priv->cdev;
 355         cmf_reenable(cdev);
 356 }
 357
 358 static void ccw_device_oper_notify(struct ccw_device *cdev)
 359 {
 360         if (ccw_device_notify(cdev, CIO_OPER)) {
 361                 /* Reenable channel measurements, if needed. */
 362                 PREPARE_WORK(&cdev->private->kick_work, cmf_reenable_delayed);
 363                 queue_work(ccw_device_work, &cdev->private->kick_work);
 364                 return;
 365         }
 366         /* Driver doesn't want device back. */
 367         ccw_device_set_notoper(cdev);
 368         PREPARE_WORK(&cdev->private->kick_work, ccw_device_do_unreg_rereg);
 369         queue_work(ccw_device_work, &cdev->private->kick_work);
 370 }
 371
 372 /*
 373  * Finished with online/offline processing.
 374  */
 375 static void
 376 ccw_device_done(struct ccw_device *cdev, int state)
 377 {
 378         struct subchannel *sch;
 379
 380         sch = to_subchannel(cdev->dev.parent);
 381
 382         ccw_device_set_timeout(cdev, 0);
 383
 384         if (state != DEV_STATE_ONLINE)
 385                 cio_disable_subchannel(sch);
 386
 387         /* Reset device status. */
 388         memset(&cdev->private->irb, 0, sizeof(struct irb));
 389
 390         cdev->private->state = state;
 391
 392
 393         if (state == DEV_STATE_BOXED)
 394                 CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n",
 395                               cdev->private->dev_id.devno, sch->schid.sch_no);
 396
 397         if (cdev->private->flags.donotify) {
 398                 cdev->private->flags.donotify = 0;
 399                 ccw_device_oper_notify(cdev);
 400         }
 401         wake_up(&cdev->private->wait_q);
 402
 403         if (css_init_done && state != DEV_STATE_ONLINE)
 404                 put_device (&cdev->dev);
 405 }
 406
 407 static int cmp_pgid(struct pgid *p1, struct pgid *p2)
 408 {
 409         char *c1;
 410         char *c2;
 411
 412         c1 = (char *)p1;
 413         c2 = (char *)p2;
 414
 415         return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
 416 }
 417
 418 static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
 419 {
 420         int i;
 421         int last;
 422
 423         last = 0;
 424         for (i = 0; i < 8; i++) {
 425                 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
 426                         /* No PGID yet */
 427                         continue;
 428                 if (cdev->private->pgid[last].inf.ps.state1 ==
 429                     SNID_STATE1_RESET) {
 430                         /* First non-zero PGID */
 431                         last = i;
 432                         continue;
 433                 }
 434                 if (cmp_pgid(&cdev->private->pgid[i],
 435                              &cdev->private->pgid[last]) == 0)
 436                         /* Non-conflicting PGIDs */
 437                         continue;
 438
 439                 /* PGID mismatch, can't pathgroup. */
 440                 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
 441                               "0.%x.%04x, can't pathgroup\n",
 442                               cdev->private->dev_id.ssid,
 443                               cdev->private->dev_id.devno);
 444                 cdev->private->options.pgroup = 0;
 445                 return;
 446         }
 447         if (cdev->private->pgid[last].inf.ps.state1 ==
 448             SNID_STATE1_RESET)
 449                 /* No previous pgid found */
 450                 memcpy(&cdev->private->pgid[0],
 451                        &channel_subsystems[0]->global_pgid,
 452                        sizeof(struct pgid));
 453         else
 454                 /* Use existing pgid */
 455                 memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
 456                        sizeof(struct pgid));
 457 }
 458
 459 /*
 460  * Function called from device_pgid.c after sense path ground has completed.
 461  */
 462 void
 463 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
 464 {
 465         struct subchannel *sch;
 466
 467         sch = to_subchannel(cdev->dev.parent);
 468         switch (err) {
 469         case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
 470                 cdev->private->options.pgroup = 0;
 471                 break;
 472         case 0: /* success */
 473         case -EACCES: /* partial success, some paths not operational */
 474                 /* Check if all pgids are equal or 0. */
 475                 __ccw_device_get_common_pgid(cdev);
 476                 break;
 477         case -ETIME:            /* Sense path group id stopped by timeout. */
 478         case -EUSERS:           /* device is reserved for someone else. */
 479                 ccw_device_done(cdev, DEV_STATE_BOXED);
 480                 return;
 481         default:
 482                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 483                 return;
 484         }
 485         /* Start Path Group verification. */
 486         cdev->private->state = DEV_STATE_VERIFY;
 487         cdev->private->flags.doverify = 0;
 488         ccw_device_verify_start(cdev);
 489 }
 490
 491 /*
 492  * Start device recognition.
 493  */
 494 int
 495 ccw_device_recognition(struct ccw_device *cdev)
 496 {
 497         struct subchannel *sch;
 498         int ret;
 499
 500         if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
 501             (cdev->private->state != DEV_STATE_BOXED))
 502                 return -EINVAL;
 503         sch = to_subchannel(cdev->dev.parent);
 504         ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
 505         if (ret != 0)
 506                 /* Couldn't enable the subchannel for i/o. Sick device. */
 507                 return ret;
 508
 509         /* After 60s the device recognition is considered to have failed. */
 510         ccw_device_set_timeout(cdev, 60*HZ);
 511
 512         /*
 513          * We used to start here with a sense pgid to find out whether a device
 514          * is locked by someone else. Unfortunately, the sense pgid command
 515          * code has other meanings on devices predating the path grouping
 516          * algorithm, so we start with sense id and box the device after an
 517          * timeout (or if sense pgid during path verification detects the device
 518          * is locked, as may happen on newer devices).
 519          */
 520         cdev->private->flags.recog_done = 0;
 521         cdev->private->state = DEV_STATE_SENSE_ID;
 522         ccw_device_sense_id_start(cdev);
 523         return 0;
 524 }
 525
 526 /*
 527  * Handle timeout in device recognition.
 528  */
 529 static void
 530 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 531 {
 532         int ret;
 533
 534         ret = ccw_device_cancel_halt_clear(cdev);
 535         switch (ret) {
 536         case 0:
 537                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 538                 break;
 539         case -ENODEV:
 540                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 541                 break;
 542         default:
 543                 ccw_device_set_timeout(cdev, 3*HZ);
 544         }
 545 }
 546
 547
 548 void
 549 ccw_device_verify_done(struct ccw_device *cdev, int err)
 550 {
 551         struct subchannel *sch;
 552
 553         sch = to_subchannel(cdev->dev.parent);
 554         /* Update schib - pom may have changed. */
 555         stsch(sch->schid, &sch->schib);
 556         /* Update lpm with verified path mask. */
 557         sch->lpm = sch->vpm;
 558         /* Repeat path verification? */
 559         if (cdev->private->flags.doverify) {
 560                 cdev->private->flags.doverify = 0;
 561                 ccw_device_verify_start(cdev);
 562                 return;
 563         }
 564         switch (err) {
 565         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 566                 cdev->private->options.pgroup = 0;
 567         case 0:
 568                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 569                 /* Deliver fake irb to device driver, if needed. */
 570                 if (cdev->private->flags.fake_irb) {
 571                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 572                         cdev->private->irb.scsw.cmd.cc = 1;
 573                         cdev->private->irb.scsw.cmd.fctl = SCSW_FCTL_START_FUNC;
 574                         cdev->private->irb.scsw.cmd.actl = SCSW_ACTL_START_PEND;
 575                         cdev->private->irb.scsw.cmd.stctl =
 576                                 SCSW_STCTL_STATUS_PEND;
 577                         cdev->private->flags.fake_irb = 0;
 578                         if (cdev->handler)
 579                                 cdev->handler(cdev, cdev->private->intparm,
 580                                               &cdev->private->irb);
 581                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 582                 }
 583                 break;
 584         case -ETIME:
 585                 /* Reset oper notify indication after verify error. */
 586                 cdev->private->flags.donotify = 0;
 587                 ccw_device_done(cdev, DEV_STATE_BOXED);
 588                 break;
 589         default:
 590                 /* Reset oper notify indication after verify error. */
 591                 cdev->private->flags.donotify = 0;
 592                 if (cdev->online) {
 593                         ccw_device_set_timeout(cdev, 0);
 594                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 595                 } else
 596                         ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 597                 break;
 598         }
 599 }
 600
 601 /*
 602  * Get device online.
 603  */
 604 int
 605 ccw_device_online(struct ccw_device *cdev)
 606 {
 607         struct subchannel *sch;
 608         int ret;
 609
 610         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 611             (cdev->private->state != DEV_STATE_BOXED))
 612                 return -EINVAL;
 613         sch = to_subchannel(cdev->dev.parent);
 614         if (css_init_done && !get_device(&cdev->dev))
 615                 return -ENODEV;
 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 (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
 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         cdev->private->state = DEV_STATE_NOT_OPER;
 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         stsch(sch->schid, &sch->schib);
 754
 755         if (scsw_actl(&sch->schib.scsw) != 0 ||
 756             (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) ||
 757             (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) {
 758                 /*
 759                  * No final status yet or final status not yet delivered
 760                  * to the device driver. Can't do path verfication now,
 761                  * delay until final status was delivered.
 762                  */
 763                 cdev->private->flags.doverify = 1;
 764                 return;
 765         }
 766         /* Device is idle, we can do the path verification. */
 767         cdev->private->state = DEV_STATE_VERIFY;
 768         cdev->private->flags.doverify = 0;
 769         ccw_device_verify_start(cdev);
 770 }
 771
 772 /*
 773  * Got an interrupt for a normal io (state online).
 774  */
 775 static void
 776 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 777 {
 778         struct irb *irb;
 779         int is_cmd;
 780
 781         irb = (struct irb *) __LC_IRB;
 782         is_cmd = !scsw_is_tm(&irb->scsw);
 783         /* Check for unsolicited interrupt. */
 784         if (!scsw_is_solicited(&irb->scsw)) {
 785                 if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
 786                     !irb->esw.esw0.erw.cons) {
 787                         /* Unit check but no sense data. Need basic sense. */
 788                         if (ccw_device_do_sense(cdev, irb) != 0)
 789                                 goto call_handler_unsol;
 790                         memcpy(&cdev->private->irb, irb, sizeof(struct irb));
 791                         cdev->private->state = DEV_STATE_W4SENSE;
 792                         cdev->private->intparm = 0;
 793                         return;
 794                 }
 795 call_handler_unsol:
 796                 if (cdev->handler)
 797                         cdev->handler (cdev, 0, irb);
 798                 if (cdev->private->flags.doverify)
 799                         ccw_device_online_verify(cdev, 0);
 800                 return;
 801         }
 802         /* Accumulate status and find out if a basic sense is needed. */
 803         ccw_device_accumulate_irb(cdev, irb);
 804         if (is_cmd && cdev->private->flags.dosense) {
 805                 if (ccw_device_do_sense(cdev, irb) == 0) {
 806                         cdev->private->state = DEV_STATE_W4SENSE;
 807                 }
 808                 return;
 809         }
 810         /* Call the handler. */
 811         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 812                 /* Start delayed path verification. */
 813                 ccw_device_online_verify(cdev, 0);
 814 }
 815
 816 /*
 817  * Got an timeout in online state.
 818  */
 819 static void
 820 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 821 {
 822         int ret;
 823
 824         ccw_device_set_timeout(cdev, 0);
 825         ret = ccw_device_cancel_halt_clear(cdev);
 826         if (ret == -EBUSY) {
 827                 ccw_device_set_timeout(cdev, 3*HZ);
 828                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 829                 return;
 830         }
 831         if (ret == -ENODEV)
 832                 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 833         else if (cdev->handler)
 834                 cdev->handler(cdev, cdev->private->intparm,
 835                               ERR_PTR(-ETIMEDOUT));
 836 }
 837
 838 /*
 839  * Got an interrupt for a basic sense.
 840  */
 841 static void
 842 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 843 {
 844         struct irb *irb;
 845
 846         irb = (struct irb *) __LC_IRB;
 847         /* Check for unsolicited interrupt. */
 848         if (scsw_stctl(&irb->scsw) ==
 849             (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 850                 if (scsw_cc(&irb->scsw) == 1)
 851                         /* Basic sense hasn't started. Try again. */
 852                         ccw_device_do_sense(cdev, irb);
 853                 else {
 854                         CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited "
 855                                       "interrupt during w4sense...\n",
 856                                       cdev->private->dev_id.ssid,
 857                                       cdev->private->dev_id.devno);
 858                         if (cdev->handler)
 859                                 cdev->handler (cdev, 0, irb);
 860                 }
 861                 return;
 862         }
 863         /*
 864          * Check if a halt or clear has been issued in the meanwhile. If yes,
 865          * only deliver the halt/clear interrupt to the device driver as if it
 866          * had killed the original request.
 867          */
 868         if (scsw_fctl(&irb->scsw) &
 869             (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
 870                 /* Retry Basic Sense if requested. */
 871                 if (cdev->private->flags.intretry) {
 872                         cdev->private->flags.intretry = 0;
 873                         ccw_device_do_sense(cdev, irb);
 874                         return;
 875                 }
 876                 cdev->private->flags.dosense = 0;
 877                 memset(&cdev->private->irb, 0, sizeof(struct irb));
 878                 ccw_device_accumulate_irb(cdev, irb);
 879                 goto call_handler;
 880         }
 881         /* Add basic sense info to irb. */
 882         ccw_device_accumulate_basic_sense(cdev, irb);
 883         if (cdev->private->flags.dosense) {
 884                 /* Another basic sense is needed. */
 885                 ccw_device_do_sense(cdev, irb);
 886                 return;
 887         }
 888 call_handler:
 889         cdev->private->state = DEV_STATE_ONLINE;
 890         /* Call the handler. */
 891         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 892                 /* Start delayed path verification. */
 893                 ccw_device_online_verify(cdev, 0);
 894 }
 895
 896 static void
 897 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 898 {
 899         struct irb *irb;
 900
 901         irb = (struct irb *) __LC_IRB;
 902         /* Accumulate status. We don't do basic sense. */
 903         ccw_device_accumulate_irb(cdev, irb);
 904         /* Remember to clear irb to avoid residuals. */
 905         memset(&cdev->private->irb, 0, sizeof(struct irb));
 906         /* Try to start delayed device verification. */
 907         ccw_device_online_verify(cdev, 0);
 908         /* Note: Don't call handler for cio initiated clear! */
 909 }
 910
 911 static void
 912 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
 913 {
 914         struct subchannel *sch;
 915
 916         sch = to_subchannel(cdev->dev.parent);
 917         ccw_device_set_timeout(cdev, 0);
 918         /* Start delayed path verification. */
 919         ccw_device_online_verify(cdev, 0);
 920         /* OK, i/o is dead now. Call interrupt handler. */
 921         if (cdev->handler)
 922                 cdev->handler(cdev, cdev->private->intparm,
 923                               ERR_PTR(-EIO));
 924 }
 925
 926 static void
 927 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 928 {
 929         int ret;
 930
 931         ret = ccw_device_cancel_halt_clear(cdev);
 932         if (ret == -EBUSY) {
 933                 ccw_device_set_timeout(cdev, 3*HZ);
 934                 return;
 935         }
 936         /* Start delayed path verification. */
 937         ccw_device_online_verify(cdev, 0);
 938         if (cdev->handler)
 939                 cdev->handler(cdev, cdev->private->intparm,
 940                               ERR_PTR(-EIO));
 941 }
 942
 943 void ccw_device_kill_io(struct ccw_device *cdev)
 944 {
 945         int ret;
 946
 947         ret = ccw_device_cancel_halt_clear(cdev);
 948         if (ret == -EBUSY) {
 949                 ccw_device_set_timeout(cdev, 3*HZ);
 950                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 951                 return;
 952         }
 953         /* Start delayed path verification. */
 954         ccw_device_online_verify(cdev, 0);
 955         if (cdev->handler)
 956                 cdev->handler(cdev, cdev->private->intparm,
 957                               ERR_PTR(-EIO));
 958 }
 959
 960 static void
 961 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
 962 {
 963         /* Start verification after current task finished. */
 964         cdev->private->flags.doverify = 1;
 965 }
 966
 967 static void
 968 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
 969 {
 970         struct irb *irb;
 971
 972         switch (dev_event) {
 973         case DEV_EVENT_INTERRUPT:
 974                 irb = (struct irb *) __LC_IRB;
 975                 /* Check for unsolicited interrupt. */
 976                 if ((scsw_stctl(&irb->scsw) ==
 977                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
 978                     (!scsw_cc(&irb->scsw)))
 979                         /* FIXME: we should restart stlck here, but this
 980                          * is extremely unlikely ... */
 981                         goto out_wakeup;
 982
 983                 ccw_device_accumulate_irb(cdev, irb);
 984                 /* We don't care about basic sense etc. */
 985                 break;
 986         default: /* timeout */
 987                 break;
 988         }
 989 out_wakeup:
 990         wake_up(&cdev->private->wait_q);
 991 }
 992
 993 static void
 994 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
 995 {
 996         struct subchannel *sch;
 997
 998         sch = to_subchannel(cdev->dev.parent);
 999         if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0)
1000                 /* Couldn't enable the subchannel for i/o. Sick device. */
1001                 return;
1002
1003         /* After 60s the device recognition is considered to have failed. */
1004         ccw_device_set_timeout(cdev, 60*HZ);
1005
1006         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1007         ccw_device_sense_id_start(cdev);
1008 }
1009
1010 void ccw_device_trigger_reprobe(struct ccw_device *cdev)
1011 {
1012         struct subchannel *sch;
1013
1014         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1015                 return;
1016
1017         sch = to_subchannel(cdev->dev.parent);
1018         /* Update some values. */
1019         if (stsch(sch->schid, &sch->schib))
1020                 return;
1021         if (!sch->schib.pmcw.dnv)
1022                 return;
1023         /*
1024          * The pim, pam, pom values may not be accurate, but they are the best
1025          * we have before performing device selection :/
1026          */
1027         sch->lpm = sch->schib.pmcw.pam & sch->opm;
1028         /* Re-set some bits in the pmcw that were lost. */
1029         sch->schib.pmcw.csense = 1;
1030         sch->schib.pmcw.ena = 0;
1031         if ((sch->lpm & (sch->lpm - 1)) != 0)
1032                 sch->schib.pmcw.mp = 1;
1033         /* We should also udate ssd info, but this has to wait. */
1034         /* Check if this is another device which appeared on the same sch. */
1035         if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1036                 PREPARE_WORK(&cdev->private->kick_work,
1037                              ccw_device_move_to_orphanage);
1038                 queue_work(slow_path_wq, &cdev->private->kick_work);
1039         } else
1040                 ccw_device_start_id(cdev, 0);
1041 }
1042
1043 static void
1044 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1045 {
1046         struct subchannel *sch;
1047
1048         sch = to_subchannel(cdev->dev.parent);
1049         /*
1050          * An interrupt in state offline means a previous disable was not
1051          * successful. Try again.
1052          */
1053         cio_disable_subchannel(sch);
1054 }
1055
1056 static void
1057 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1058 {
1059         retry_set_schib(cdev);
1060         cdev->private->state = DEV_STATE_ONLINE;
1061         dev_fsm_event(cdev, dev_event);
1062 }
1063
1064 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1065                                        enum dev_event dev_event)
1066 {
1067         cmf_retry_copy_block(cdev);
1068         cdev->private->state = DEV_STATE_ONLINE;
1069         dev_fsm_event(cdev, dev_event);
1070 }
1071
1072 static void
1073 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1074 {
1075         ccw_device_set_timeout(cdev, 0);
1076         if (dev_event == DEV_EVENT_NOTOPER)
1077                 cdev->private->state = DEV_STATE_NOT_OPER;
1078         else
1079                 cdev->private->state = DEV_STATE_OFFLINE;
1080         wake_up(&cdev->private->wait_q);
1081 }
1082
1083 static void
1084 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1085 {
1086         int ret;
1087
1088         ret = ccw_device_cancel_halt_clear(cdev);
1089         switch (ret) {
1090         case 0:
1091                 cdev->private->state = DEV_STATE_OFFLINE;
1092                 wake_up(&cdev->private->wait_q);
1093                 break;
1094         case -ENODEV:
1095                 cdev->private->state = DEV_STATE_NOT_OPER;
1096                 wake_up(&cdev->private->wait_q);
1097                 break;
1098         default:
1099                 ccw_device_set_timeout(cdev, HZ/10);
1100         }
1101 }
1102
1103 /*
1104  * No operation action. This is used e.g. to ignore a timeout event in
1105  * state offline.
1106  */
1107 static void
1108 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1109 {
1110 }
1111
1112 /*
1113  * Bug operation action.
1114  */
1115 static void
1116 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1117 {
1118         CIO_MSG_EVENT(0, "Internal state [%i][%i] not handled for device "
1119                       "0.%x.%04x\n", cdev->private->state, dev_event,
1120                       cdev->private->dev_id.ssid,
1121                       cdev->private->dev_id.devno);
1122         BUG();
1123 }
1124
1125 /*
1126  * device statemachine
1127  */
1128 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1129         [DEV_STATE_NOT_OPER] = {
1130                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1131                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1132                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1133                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1134         },
1135         [DEV_STATE_SENSE_PGID] = {
1136                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1137                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1138                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1139                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1140         },
1141         [DEV_STATE_SENSE_ID] = {
1142                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1143                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1144                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1145                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1146         },
1147         [DEV_STATE_OFFLINE] = {
1148                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1149                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1150                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1151                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1152         },
1153         [DEV_STATE_VERIFY] = {
1154                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1155                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1156                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1157                 [DEV_EVENT_VERIFY]      = ccw_device_delay_verify,
1158         },
1159         [DEV_STATE_ONLINE] = {
1160                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1161                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1162                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1163                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1164         },
1165         [DEV_STATE_W4SENSE] = {
1166                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1167                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1168                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1169                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1170         },
1171         [DEV_STATE_DISBAND_PGID] = {
1172                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1173                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1174                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1175                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1176         },
1177         [DEV_STATE_BOXED] = {
1178                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1179                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1180                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1181                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1182         },
1183         /* states to wait for i/o completion before doing something */
1184         [DEV_STATE_CLEAR_VERIFY] = {
1185                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1186                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1187                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1188                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1189         },
1190         [DEV_STATE_TIMEOUT_KILL] = {
1191                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1192                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1193                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1194                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1195         },
1196         [DEV_STATE_QUIESCE] = {
1197                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1198                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1199                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1200                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1201         },
1202         /* special states for devices gone not operational */
1203         [DEV_STATE_DISCONNECTED] = {
1204                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1205                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1206                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1207                 [DEV_EVENT_VERIFY]      = ccw_device_start_id,
1208         },
1209         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1210                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1211                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1212                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1213                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1214         },
1215         [DEV_STATE_CMFCHANGE] = {
1216                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1217                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1218                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1219                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1220         },
1221         [DEV_STATE_CMFUPDATE] = {
1222                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1223                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1224                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1225                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1226         },
1227 };
1228
1229 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);