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", cdev->dev.bus_id);
  56         printk(KERN_WARNING "cio: subchannel bus id: %s\n", sch->dev.bus_id);
  57         printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, "
  58                "vpm: %02x\n", sch->lpm, sch->opm, sch->vpm);
  59
  60         if (orb->tm.b) {
  61                 printk(KERN_WARNING "cio: orb indicates transport mode\n");
  62                 printk(KERN_WARNING "cio: last tcw:\n");
  63                 print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
  64                                (void *)(addr_t)orb->tm.tcw,
  65                                sizeof(struct tcw), 0);
  66         } else {
  67                 printk(KERN_WARNING "cio: orb indicates command mode\n");
  68                 if ((void *)(addr_t)orb->cmd.cpa == &private->sense_ccw ||
  69                     (void *)(addr_t)orb->cmd.cpa == cdev->private->iccws)
  70                         printk(KERN_WARNING "cio: last channel program "
  71                                "(intern):\n");
  72                 else
  73                         printk(KERN_WARNING "cio: last channel program:\n");
  74
  75                 print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
  76                                (void *)(addr_t)orb->cmd.cpa,
  77                                sizeof(struct ccw1), 0);
  78         }
  79         printk(KERN_WARNING "cio: ccw device state: %d\n",
  80                cdev->private->state);
  81         printk(KERN_WARNING "cio: store subchannel returned: cc=%d\n", cc);
  82         printk(KERN_WARNING "cio: schib:\n");
  83         print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
  84                        &schib, sizeof(schib), 0);
  85         printk(KERN_WARNING "cio: ccw device flags:\n");
  86         print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
  87                        &cdev->private->flags, sizeof(cdev->private->flags), 0);
  88 }
  89
  90 /*
  91  * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
  92  */
  93 static void
  94 ccw_device_timeout(unsigned long data)
  95 {
  96         struct ccw_device *cdev;
  97
  98         cdev = (struct ccw_device *) data;
  99         spin_lock_irq(cdev->ccwlock);
 100         if (timeout_log_enabled)
 101                 ccw_timeout_log(cdev);
 102         dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
 103         spin_unlock_irq(cdev->ccwlock);
 104 }
 105
 106 /*
 107  * Set timeout
 108  */
 109 void
 110 ccw_device_set_timeout(struct ccw_device *cdev, int expires)
 111 {
 112         if (expires == 0) {
 113                 del_timer(&cdev->private->timer);
 114                 return;
 115         }
 116         if (timer_pending(&cdev->private->timer)) {
 117                 if (mod_timer(&cdev->private->timer, jiffies + expires))
 118                         return;
 119         }
 120         cdev->private->timer.function = ccw_device_timeout;
 121         cdev->private->timer.data = (unsigned long) cdev;
 122         cdev->private->timer.expires = jiffies + expires;
 123         add_timer(&cdev->private->timer);
 124 }
 125
 126 /*
 127  * Cancel running i/o. This is called repeatedly since halt/clear are
 128  * asynchronous operations. We do one try with cio_cancel, two tries
 129  * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
 130  * Returns 0 if device now idle, -ENODEV for device not operational and
 131  * -EBUSY if an interrupt is expected (either from halt/clear or from a
 132  * status pending).
 133  */
 134 int
 135 ccw_device_cancel_halt_clear(struct ccw_device *cdev)
 136 {
 137         struct subchannel *sch;
 138         int ret;
 139
 140         sch = to_subchannel(cdev->dev.parent);
 141         ret = stsch(sch->schid, &sch->schib);
 142         if (ret || !sch->schib.pmcw.dnv)
 143                 return -ENODEV;
 144         if (!sch->schib.pmcw.ena)
 145                 /* Not operational -> done. */
 146                 return 0;
 147         /* Stage 1: cancel io. */
 148         if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) &&
 149             !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
 150                 if (!scsw_is_tm(&sch->schib.scsw)) {
 151                         ret = cio_cancel(sch);
 152                         if (ret != -EINVAL)
 153                                 return ret;
 154                 }
 155                 /* cancel io unsuccessful or not applicable (transport mode).
 156                  * Continue with asynchronous instructions. */
 157                 cdev->private->iretry = 3;      /* 3 halt retries. */
 158         }
 159         if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
 160                 /* Stage 2: halt io. */
 161                 if (cdev->private->iretry) {
 162                         cdev->private->iretry--;
 163                         ret = cio_halt(sch);
 164                         if (ret != -EBUSY)
 165                                 return (ret == 0) ? -EBUSY : ret;
 166                 }
 167                 /* halt io unsuccessful. */
 168                 cdev->private->iretry = 255;    /* 255 clear retries. */
 169         }
 170         /* Stage 3: clear io. */
 171         if (cdev->private->iretry) {
 172                 cdev->private->iretry--;
 173                 ret = cio_clear (sch);
 174                 return (ret == 0) ? -EBUSY : ret;
 175         }
 176         panic("Can't stop i/o on subchannel.\n");
 177 }
 178
 179 static int
 180 ccw_device_handle_oper(struct ccw_device *cdev)
 181 {
 182         struct subchannel *sch;
 183
 184         sch = to_subchannel(cdev->dev.parent);
 185         cdev->private->flags.recog_done = 1;
 186         /*
 187          * Check if cu type and device type still match. If
 188          * not, it is certainly another device and we have to
 189          * de- and re-register.
 190          */
 191         if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
 192             cdev->id.cu_model != cdev->private->senseid.cu_model ||
 193             cdev->id.dev_type != cdev->private->senseid.dev_type ||
 194             cdev->id.dev_model != cdev->private->senseid.dev_model) {
 195                 PREPARE_WORK(&cdev->private->kick_work,
 196                              ccw_device_do_unreg_rereg);
 197                 queue_work(ccw_device_work, &cdev->private->kick_work);
 198                 return 0;
 199         }
 200         cdev->private->flags.donotify = 1;
 201         return 1;
 202 }
 203
 204 /*
 205  * The machine won't give us any notification by machine check if a chpid has
 206  * been varied online on the SE so we have to find out by magic (i. e. driving
 207  * the channel subsystem to device selection and updating our path masks).
 208  */
 209 static void
 210 __recover_lost_chpids(struct subchannel *sch, int old_lpm)
 211 {
 212         int mask, i;
 213         struct chp_id chpid;
 214
 215         chp_id_init(&chpid);
 216         for (i = 0; i<8; i++) {
 217                 mask = 0x80 >> i;
 218                 if (!(sch->lpm & mask))
 219                         continue;
 220                 if (old_lpm & mask)
 221                         continue;
 222                 chpid.id = sch->schib.pmcw.chpid[i];
 223                 if (!chp_is_registered(chpid))
 224                         css_schedule_eval_all();
 225         }
 226 }
 227
 228 /*
 229  * Stop device recognition.
 230  */
 231 static void
 232 ccw_device_recog_done(struct ccw_device *cdev, int state)
 233 {
 234         struct subchannel *sch;
 235         int notify, old_lpm, same_dev;
 236
 237         sch = to_subchannel(cdev->dev.parent);
 238
 239         ccw_device_set_timeout(cdev, 0);
 240         cio_disable_subchannel(sch);
 241         /*
 242          * Now that we tried recognition, we have performed device selection
 243          * through ssch() and the path information is up to date.
 244          */
 245         old_lpm = sch->lpm;
 246         stsch(sch->schid, &sch->schib);
 247         sch->lpm = sch->schib.pmcw.pam & sch->opm;
 248         /* Check since device may again have become not operational. */
 249         if (!sch->schib.pmcw.dnv)
 250                 state = DEV_STATE_NOT_OPER;
 251         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
 252                 /* Force reprobe on all chpids. */
 253                 old_lpm = 0;
 254         if (sch->lpm != old_lpm)
 255                 __recover_lost_chpids(sch, old_lpm);
 256         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 257                 if (state == DEV_STATE_NOT_OPER) {
 258                         cdev->private->flags.recog_done = 1;
 259                         cdev->private->state = DEV_STATE_DISCONNECTED;
 260                         return;
 261                 }
 262                 /* Boxed devices don't need extra treatment. */
 263         }
 264         notify = 0;
 265         same_dev = 0; /* Keep the compiler quiet... */
 266         switch (state) {
 267         case DEV_STATE_NOT_OPER:
 268                 CIO_MSG_EVENT(2, "SenseID : unknown device %04x on "
 269                               "subchannel 0.%x.%04x\n",
 270                               cdev->private->dev_id.devno,
 271                               sch->schid.ssid, sch->schid.sch_no);
 272                 break;
 273         case DEV_STATE_OFFLINE:
 274                 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 275                         same_dev = ccw_device_handle_oper(cdev);
 276                         notify = 1;
 277                 }
 278                 /* fill out sense information */
 279                 memset(&cdev->id, 0, sizeof(cdev->id));
 280                 cdev->id.cu_type   = cdev->private->senseid.cu_type;
 281                 cdev->id.cu_model  = cdev->private->senseid.cu_model;
 282                 cdev->id.dev_type  = cdev->private->senseid.dev_type;
 283                 cdev->id.dev_model = cdev->private->senseid.dev_model;
 284                 if (notify) {
 285                         cdev->private->state = DEV_STATE_OFFLINE;
 286                         if (same_dev) {
 287                                 /* Get device online again. */
 288                                 ccw_device_online(cdev);
 289                                 wake_up(&cdev->private->wait_q);
 290                         }
 291                         return;
 292                 }
 293                 /* Issue device info message. */
 294                 CIO_MSG_EVENT(4, "SenseID : device 0.%x.%04x reports: "
 295                               "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
 296                               "%04X/%02X\n",
 297                               cdev->private->dev_id.ssid,
 298                               cdev->private->dev_id.devno,
 299                               cdev->id.cu_type, cdev->id.cu_model,
 300                               cdev->id.dev_type, cdev->id.dev_model);
 301                 break;
 302         case DEV_STATE_BOXED:
 303                 CIO_MSG_EVENT(0, "SenseID : boxed device %04x on "
 304                               " subchannel 0.%x.%04x\n",
 305                               cdev->private->dev_id.devno,
 306                               sch->schid.ssid, sch->schid.sch_no);
 307                 break;
 308         }
 309         cdev->private->state = state;
 310         io_subchannel_recog_done(cdev);
 311         if (state != DEV_STATE_NOT_OPER)
 312                 wake_up(&cdev->private->wait_q);
 313 }
 314
 315 /*
 316  * Function called from device_id.c after sense id has completed.
 317  */
 318 void
 319 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
 320 {
 321         switch (err) {
 322         case 0:
 323                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
 324                 break;
 325         case -ETIME:            /* Sense id stopped by timeout. */
 326                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 327                 break;
 328         default:
 329                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 330                 break;
 331         }
 332 }
 333
 334 int ccw_device_notify(struct ccw_device *cdev, int event)
 335 {
 336         if (!cdev->drv)
 337                 return 0;
 338         if (!cdev->online)
 339                 return 0;
 340         CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n",
 341                       cdev->private->dev_id.ssid, cdev->private->dev_id.devno,
 342                       event);
 343         return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0;
 344 }
 345
 346 static void cmf_reenable_delayed(struct work_struct *work)
 347 {
 348         struct ccw_device_private *priv;
 349         struct ccw_device *cdev;
 350
 351         priv = container_of(work, struct ccw_device_private, kick_work);
 352         cdev = priv->cdev;
 353         cmf_reenable(cdev);
 354 }
 355
 356 static void ccw_device_oper_notify(struct ccw_device *cdev)
 357 {
 358         if (ccw_device_notify(cdev, CIO_OPER)) {
 359                 /* Reenable channel measurements, if needed. */
 360                 PREPARE_WORK(&cdev->private->kick_work, cmf_reenable_delayed);
 361                 queue_work(ccw_device_work, &cdev->private->kick_work);
 362                 return;
 363         }
 364         /* Driver doesn't want device back. */
 365         ccw_device_set_notoper(cdev);
 366         PREPARE_WORK(&cdev->private->kick_work, ccw_device_do_unreg_rereg);
 367         queue_work(ccw_device_work, &cdev->private->kick_work);
 368 }
 369
 370 /*
 371  * Finished with online/offline processing.
 372  */
 373 static void
 374 ccw_device_done(struct ccw_device *cdev, int state)
 375 {
 376         struct subchannel *sch;
 377
 378         sch = to_subchannel(cdev->dev.parent);
 379
 380         ccw_device_set_timeout(cdev, 0);
 381
 382         if (state != DEV_STATE_ONLINE)
 383                 cio_disable_subchannel(sch);
 384
 385         /* Reset device status. */
 386         memset(&cdev->private->irb, 0, sizeof(struct irb));
 387
 388         cdev->private->state = state;
 389
 390
 391         if (state == DEV_STATE_BOXED)
 392                 CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n",
 393                               cdev->private->dev_id.devno, sch->schid.sch_no);
 394
 395         if (cdev->private->flags.donotify) {
 396                 cdev->private->flags.donotify = 0;
 397                 ccw_device_oper_notify(cdev);
 398         }
 399         wake_up(&cdev->private->wait_q);
 400
 401         if (css_init_done && state != DEV_STATE_ONLINE)
 402                 put_device (&cdev->dev);
 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         stsch(sch->schid, &sch->schib);
 554         /* Update lpm with verified path mask. */
 555         sch->lpm = sch->vpm;
 556         /* Repeat path verification? */
 557         if (cdev->private->flags.doverify) {
 558                 cdev->private->flags.doverify = 0;
 559                 ccw_device_verify_start(cdev);
 560                 return;
 561         }
 562         switch (err) {
 563         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 564                 cdev->private->options.pgroup = 0;
 565         case 0:
 566                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 567                 /* Deliver fake irb to device driver, if needed. */
 568                 if (cdev->private->flags.fake_irb) {
 569                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 570                         cdev->private->irb.scsw.cmd.cc = 1;
 571                         cdev->private->irb.scsw.cmd.fctl = SCSW_FCTL_START_FUNC;
 572                         cdev->private->irb.scsw.cmd.actl = SCSW_ACTL_START_PEND;
 573                         cdev->private->irb.scsw.cmd.stctl =
 574                                 SCSW_STCTL_STATUS_PEND;
 575                         cdev->private->flags.fake_irb = 0;
 576                         if (cdev->handler)
 577                                 cdev->handler(cdev, cdev->private->intparm,
 578                                               &cdev->private->irb);
 579                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 580                 }
 581                 break;
 582         case -ETIME:
 583                 /* Reset oper notify indication after verify error. */
 584                 cdev->private->flags.donotify = 0;
 585                 ccw_device_done(cdev, DEV_STATE_BOXED);
 586                 break;
 587         default:
 588                 /* Reset oper notify indication after verify error. */
 589                 cdev->private->flags.donotify = 0;
 590                 if (cdev->online) {
 591                         ccw_device_set_timeout(cdev, 0);
 592                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 593                 } else
 594                         ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 595                 break;
 596         }
 597 }
 598
 599 /*
 600  * Get device online.
 601  */
 602 int
 603 ccw_device_online(struct ccw_device *cdev)
 604 {
 605         struct subchannel *sch;
 606         int ret;
 607
 608         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 609             (cdev->private->state != DEV_STATE_BOXED))
 610                 return -EINVAL;
 611         sch = to_subchannel(cdev->dev.parent);
 612         if (css_init_done && !get_device(&cdev->dev))
 613                 return -ENODEV;
 614         ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
 615         if (ret != 0) {
 616                 /* Couldn't enable the subchannel for i/o. Sick device. */
 617                 if (ret == -ENODEV)
 618                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 619                 return ret;
 620         }
 621         /* Do we want to do path grouping? */
 622         if (!cdev->private->options.pgroup) {
 623                 /* Start initial path verification. */
 624                 cdev->private->state = DEV_STATE_VERIFY;
 625                 cdev->private->flags.doverify = 0;
 626                 ccw_device_verify_start(cdev);
 627                 return 0;
 628         }
 629         /* Do a SensePGID first. */
 630         cdev->private->state = DEV_STATE_SENSE_PGID;
 631         ccw_device_sense_pgid_start(cdev);
 632         return 0;
 633 }
 634
 635 void
 636 ccw_device_disband_done(struct ccw_device *cdev, int err)
 637 {
 638         switch (err) {
 639         case 0:
 640                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 641                 break;
 642         case -ETIME:
 643                 ccw_device_done(cdev, DEV_STATE_BOXED);
 644                 break;
 645         default:
 646                 cdev->private->flags.donotify = 0;
 647                 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 648                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 649                 break;
 650         }
 651 }
 652
 653 /*
 654  * Shutdown device.
 655  */
 656 int
 657 ccw_device_offline(struct ccw_device *cdev)
 658 {
 659         struct subchannel *sch;
 660
 661         if (ccw_device_is_orphan(cdev)) {
 662                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 663                 return 0;
 664         }
 665         sch = to_subchannel(cdev->dev.parent);
 666         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
 667                 return -ENODEV;
 668         if (scsw_actl(&sch->schib.scsw) != 0)
 669                 return -EBUSY;
 670         if (cdev->private->state != DEV_STATE_ONLINE)
 671                 return -EINVAL;
 672         /* Are we doing path grouping? */
 673         if (!cdev->private->options.pgroup) {
 674                 /* No, set state offline immediately. */
 675                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 676                 return 0;
 677         }
 678         /* Start Set Path Group commands. */
 679         cdev->private->state = DEV_STATE_DISBAND_PGID;
 680         ccw_device_disband_start(cdev);
 681         return 0;
 682 }
 683
 684 /*
 685  * Handle timeout in device online/offline process.
 686  */
 687 static void
 688 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 689 {
 690         int ret;
 691
 692         ret = ccw_device_cancel_halt_clear(cdev);
 693         switch (ret) {
 694         case 0:
 695                 ccw_device_done(cdev, DEV_STATE_BOXED);
 696                 break;
 697         case -ENODEV:
 698                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 699                 break;
 700         default:
 701                 ccw_device_set_timeout(cdev, 3*HZ);
 702         }
 703 }
 704
 705 /*
 706  * Handle not oper event in device recognition.
 707  */
 708 static void
 709 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 710 {
 711         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 712 }
 713
 714 /*
 715  * Handle not operational event in non-special state.
 716  */
 717 static void ccw_device_generic_notoper(struct ccw_device *cdev,
 718                                        enum dev_event dev_event)
 719 {
 720         struct subchannel *sch;
 721
 722         cdev->private->state = DEV_STATE_NOT_OPER;
 723         sch = to_subchannel(cdev->dev.parent);
 724         css_schedule_eval(sch->schid);
 725 }
 726
 727 /*
 728  * Handle path verification event.
 729  */
 730 static void
 731 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 732 {
 733         struct subchannel *sch;
 734
 735         if (cdev->private->state == DEV_STATE_W4SENSE) {
 736                 cdev->private->flags.doverify = 1;
 737                 return;
 738         }
 739         sch = to_subchannel(cdev->dev.parent);
 740         /*
 741          * Since we might not just be coming from an interrupt from the
 742          * subchannel we have to update the schib.
 743          */
 744         stsch(sch->schid, &sch->schib);
 745
 746         if (scsw_actl(&sch->schib.scsw) != 0 ||
 747             (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) ||
 748             (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) {
 749                 /*
 750                  * No final status yet or final status not yet delivered
 751                  * to the device driver. Can't do path verfication now,
 752                  * delay until final status was delivered.
 753                  */
 754                 cdev->private->flags.doverify = 1;
 755                 return;
 756         }
 757         /* Device is idle, we can do the path verification. */
 758         cdev->private->state = DEV_STATE_VERIFY;
 759         cdev->private->flags.doverify = 0;
 760         ccw_device_verify_start(cdev);
 761 }
 762
 763 /*
 764  * Got an interrupt for a normal io (state online).
 765  */
 766 static void
 767 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 768 {
 769         struct irb *irb;
 770         int is_cmd;
 771
 772         irb = (struct irb *) __LC_IRB;
 773         is_cmd = !scsw_is_tm(&irb->scsw);
 774         /* Check for unsolicited interrupt. */
 775         if (!scsw_is_solicited(&irb->scsw)) {
 776                 if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
 777                     !irb->esw.esw0.erw.cons) {
 778                         /* Unit check but no sense data. Need basic sense. */
 779                         if (ccw_device_do_sense(cdev, irb) != 0)
 780                                 goto call_handler_unsol;
 781                         memcpy(&cdev->private->irb, irb, sizeof(struct irb));
 782                         cdev->private->state = DEV_STATE_W4SENSE;
 783                         cdev->private->intparm = 0;
 784                         return;
 785                 }
 786 call_handler_unsol:
 787                 if (cdev->handler)
 788                         cdev->handler (cdev, 0, irb);
 789                 if (cdev->private->flags.doverify)
 790                         ccw_device_online_verify(cdev, 0);
 791                 return;
 792         }
 793         /* Accumulate status and find out if a basic sense is needed. */
 794         ccw_device_accumulate_irb(cdev, irb);
 795         if (is_cmd && cdev->private->flags.dosense) {
 796                 if (ccw_device_do_sense(cdev, irb) == 0) {
 797                         cdev->private->state = DEV_STATE_W4SENSE;
 798                 }
 799                 return;
 800         }
 801         /* Call the handler. */
 802         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 803                 /* Start delayed path verification. */
 804                 ccw_device_online_verify(cdev, 0);
 805 }
 806
 807 /*
 808  * Got an timeout in online state.
 809  */
 810 static void
 811 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 812 {
 813         int ret;
 814
 815         ccw_device_set_timeout(cdev, 0);
 816         ret = ccw_device_cancel_halt_clear(cdev);
 817         if (ret == -EBUSY) {
 818                 ccw_device_set_timeout(cdev, 3*HZ);
 819                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 820                 return;
 821         }
 822         if (ret == -ENODEV)
 823                 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 824         else if (cdev->handler)
 825                 cdev->handler(cdev, cdev->private->intparm,
 826                               ERR_PTR(-ETIMEDOUT));
 827 }
 828
 829 /*
 830  * Got an interrupt for a basic sense.
 831  */
 832 static void
 833 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 834 {
 835         struct irb *irb;
 836
 837         irb = (struct irb *) __LC_IRB;
 838         /* Check for unsolicited interrupt. */
 839         if (scsw_stctl(&irb->scsw) ==
 840             (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 841                 if (scsw_cc(&irb->scsw) == 1)
 842                         /* Basic sense hasn't started. Try again. */
 843                         ccw_device_do_sense(cdev, irb);
 844                 else {
 845                         CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited "
 846                                       "interrupt during w4sense...\n",
 847                                       cdev->private->dev_id.ssid,
 848                                       cdev->private->dev_id.devno);
 849                         if (cdev->handler)
 850                                 cdev->handler (cdev, 0, irb);
 851                 }
 852                 return;
 853         }
 854         /*
 855          * Check if a halt or clear has been issued in the meanwhile. If yes,
 856          * only deliver the halt/clear interrupt to the device driver as if it
 857          * had killed the original request.
 858          */
 859         if (scsw_fctl(&irb->scsw) &
 860             (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
 861                 /* Retry Basic Sense if requested. */
 862                 if (cdev->private->flags.intretry) {
 863                         cdev->private->flags.intretry = 0;
 864                         ccw_device_do_sense(cdev, irb);
 865                         return;
 866                 }
 867                 cdev->private->flags.dosense = 0;
 868                 memset(&cdev->private->irb, 0, sizeof(struct irb));
 869                 ccw_device_accumulate_irb(cdev, irb);
 870                 goto call_handler;
 871         }
 872         /* Add basic sense info to irb. */
 873         ccw_device_accumulate_basic_sense(cdev, irb);
 874         if (cdev->private->flags.dosense) {
 875                 /* Another basic sense is needed. */
 876                 ccw_device_do_sense(cdev, irb);
 877                 return;
 878         }
 879 call_handler:
 880         cdev->private->state = DEV_STATE_ONLINE;
 881         /* Call the handler. */
 882         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 883                 /* Start delayed path verification. */
 884                 ccw_device_online_verify(cdev, 0);
 885 }
 886
 887 static void
 888 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 889 {
 890         struct irb *irb;
 891
 892         irb = (struct irb *) __LC_IRB;
 893         /* Accumulate status. We don't do basic sense. */
 894         ccw_device_accumulate_irb(cdev, irb);
 895         /* Remember to clear irb to avoid residuals. */
 896         memset(&cdev->private->irb, 0, sizeof(struct irb));
 897         /* Try to start delayed device verification. */
 898         ccw_device_online_verify(cdev, 0);
 899         /* Note: Don't call handler for cio initiated clear! */
 900 }
 901
 902 static void
 903 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
 904 {
 905         struct subchannel *sch;
 906
 907         sch = to_subchannel(cdev->dev.parent);
 908         ccw_device_set_timeout(cdev, 0);
 909         /* Start delayed path verification. */
 910         ccw_device_online_verify(cdev, 0);
 911         /* OK, i/o is dead now. Call interrupt handler. */
 912         if (cdev->handler)
 913                 cdev->handler(cdev, cdev->private->intparm,
 914                               ERR_PTR(-EIO));
 915 }
 916
 917 static void
 918 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 919 {
 920         int ret;
 921
 922         ret = ccw_device_cancel_halt_clear(cdev);
 923         if (ret == -EBUSY) {
 924                 ccw_device_set_timeout(cdev, 3*HZ);
 925                 return;
 926         }
 927         /* Start delayed path verification. */
 928         ccw_device_online_verify(cdev, 0);
 929         if (cdev->handler)
 930                 cdev->handler(cdev, cdev->private->intparm,
 931                               ERR_PTR(-EIO));
 932 }
 933
 934 void ccw_device_kill_io(struct ccw_device *cdev)
 935 {
 936         int ret;
 937
 938         ret = ccw_device_cancel_halt_clear(cdev);
 939         if (ret == -EBUSY) {
 940                 ccw_device_set_timeout(cdev, 3*HZ);
 941                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 942                 return;
 943         }
 944         /* Start delayed path verification. */
 945         ccw_device_online_verify(cdev, 0);
 946         if (cdev->handler)
 947                 cdev->handler(cdev, cdev->private->intparm,
 948                               ERR_PTR(-EIO));
 949 }
 950
 951 static void
 952 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
 953 {
 954         /* Start verification after current task finished. */
 955         cdev->private->flags.doverify = 1;
 956 }
 957
 958 static void
 959 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
 960 {
 961         struct irb *irb;
 962
 963         switch (dev_event) {
 964         case DEV_EVENT_INTERRUPT:
 965                 irb = (struct irb *) __LC_IRB;
 966                 /* Check for unsolicited interrupt. */
 967                 if ((scsw_stctl(&irb->scsw) ==
 968                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
 969                     (!scsw_cc(&irb->scsw)))
 970                         /* FIXME: we should restart stlck here, but this
 971                          * is extremely unlikely ... */
 972                         goto out_wakeup;
 973
 974                 ccw_device_accumulate_irb(cdev, irb);
 975                 /* We don't care about basic sense etc. */
 976                 break;
 977         default: /* timeout */
 978                 break;
 979         }
 980 out_wakeup:
 981         wake_up(&cdev->private->wait_q);
 982 }
 983
 984 static void
 985 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
 986 {
 987         struct subchannel *sch;
 988
 989         sch = to_subchannel(cdev->dev.parent);
 990         if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0)
 991                 /* Couldn't enable the subchannel for i/o. Sick device. */
 992                 return;
 993
 994         /* After 60s the device recognition is considered to have failed. */
 995         ccw_device_set_timeout(cdev, 60*HZ);
 996
 997         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
 998         ccw_device_sense_id_start(cdev);
 999 }
1000
1001 void ccw_device_trigger_reprobe(struct ccw_device *cdev)
1002 {
1003         struct subchannel *sch;
1004
1005         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1006                 return;
1007
1008         sch = to_subchannel(cdev->dev.parent);
1009         /* Update some values. */
1010         if (stsch(sch->schid, &sch->schib))
1011                 return;
1012         if (!sch->schib.pmcw.dnv)
1013                 return;
1014         /*
1015          * The pim, pam, pom values may not be accurate, but they are the best
1016          * we have before performing device selection :/
1017          */
1018         sch->lpm = sch->schib.pmcw.pam & sch->opm;
1019         /* Re-set some bits in the pmcw that were lost. */
1020         sch->schib.pmcw.csense = 1;
1021         sch->schib.pmcw.ena = 0;
1022         if ((sch->lpm & (sch->lpm - 1)) != 0)
1023                 sch->schib.pmcw.mp = 1;
1024         /* We should also udate ssd info, but this has to wait. */
1025         /* Check if this is another device which appeared on the same sch. */
1026         if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1027                 PREPARE_WORK(&cdev->private->kick_work,
1028                              ccw_device_move_to_orphanage);
1029                 queue_work(slow_path_wq, &cdev->private->kick_work);
1030         } else
1031                 ccw_device_start_id(cdev, 0);
1032 }
1033
1034 static void
1035 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1036 {
1037         struct subchannel *sch;
1038
1039         sch = to_subchannel(cdev->dev.parent);
1040         /*
1041          * An interrupt in state offline means a previous disable was not
1042          * successful. Try again.
1043          */
1044         cio_disable_subchannel(sch);
1045 }
1046
1047 static void
1048 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1049 {
1050         retry_set_schib(cdev);
1051         cdev->private->state = DEV_STATE_ONLINE;
1052         dev_fsm_event(cdev, dev_event);
1053 }
1054
1055 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1056                                        enum dev_event dev_event)
1057 {
1058         cmf_retry_copy_block(cdev);
1059         cdev->private->state = DEV_STATE_ONLINE;
1060         dev_fsm_event(cdev, dev_event);
1061 }
1062
1063 static void
1064 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1065 {
1066         ccw_device_set_timeout(cdev, 0);
1067         if (dev_event == DEV_EVENT_NOTOPER)
1068                 cdev->private->state = DEV_STATE_NOT_OPER;
1069         else
1070                 cdev->private->state = DEV_STATE_OFFLINE;
1071         wake_up(&cdev->private->wait_q);
1072 }
1073
1074 static void
1075 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1076 {
1077         int ret;
1078
1079         ret = ccw_device_cancel_halt_clear(cdev);
1080         switch (ret) {
1081         case 0:
1082                 cdev->private->state = DEV_STATE_OFFLINE;
1083                 wake_up(&cdev->private->wait_q);
1084                 break;
1085         case -ENODEV:
1086                 cdev->private->state = DEV_STATE_NOT_OPER;
1087                 wake_up(&cdev->private->wait_q);
1088                 break;
1089         default:
1090                 ccw_device_set_timeout(cdev, HZ/10);
1091         }
1092 }
1093
1094 /*
1095  * No operation action. This is used e.g. to ignore a timeout event in
1096  * state offline.
1097  */
1098 static void
1099 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1100 {
1101 }
1102
1103 /*
1104  * Bug operation action.
1105  */
1106 static void
1107 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1108 {
1109         CIO_MSG_EVENT(0, "Internal state [%i][%i] not handled for device "
1110                       "0.%x.%04x\n", cdev->private->state, dev_event,
1111                       cdev->private->dev_id.ssid,
1112                       cdev->private->dev_id.devno);
1113         BUG();
1114 }
1115
1116 /*
1117  * device statemachine
1118  */
1119 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1120         [DEV_STATE_NOT_OPER] = {
1121                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1122                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1123                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1124                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1125         },
1126         [DEV_STATE_SENSE_PGID] = {
1127                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1128                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1129                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1130                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1131         },
1132         [DEV_STATE_SENSE_ID] = {
1133                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1134                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1135                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1136                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1137         },
1138         [DEV_STATE_OFFLINE] = {
1139                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1140                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1141                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1142                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1143         },
1144         [DEV_STATE_VERIFY] = {
1145                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1146                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1147                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1148                 [DEV_EVENT_VERIFY]      = ccw_device_delay_verify,
1149         },
1150         [DEV_STATE_ONLINE] = {
1151                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1152                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1153                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1154                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1155         },
1156         [DEV_STATE_W4SENSE] = {
1157                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1158                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1159                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1160                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1161         },
1162         [DEV_STATE_DISBAND_PGID] = {
1163                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1164                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1165                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1166                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1167         },
1168         [DEV_STATE_BOXED] = {
1169                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1170                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1171                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1172                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1173         },
1174         /* states to wait for i/o completion before doing something */
1175         [DEV_STATE_CLEAR_VERIFY] = {
1176                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1177                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1178                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1179                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1180         },
1181         [DEV_STATE_TIMEOUT_KILL] = {
1182                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1183                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1184                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1185                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1186         },
1187         [DEV_STATE_QUIESCE] = {
1188                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1189                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1190                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1191                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1192         },
1193         /* special states for devices gone not operational */
1194         [DEV_STATE_DISCONNECTED] = {
1195                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1196                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1197                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1198                 [DEV_EVENT_VERIFY]      = ccw_device_start_id,
1199         },
1200         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1201                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1202                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1203                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1204                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1205         },
1206         [DEV_STATE_CMFCHANGE] = {
1207                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1208                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1209                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1210                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1211         },
1212         [DEV_STATE_CMFUPDATE] = {
1213                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1214                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1215                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1216                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1217         },
1218 };
1219
1220 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);