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         int cc;
  43
  44         sch = to_subchannel(cdev->dev.parent);
  45         private = to_io_private(sch);
  46         cc = stsch(sch->schid, &schib);
  47
  48         printk(KERN_WARNING "cio: ccw device timeout occurred at %llx, "
  49                "device information:\n", get_clock());
  50         printk(KERN_WARNING "cio: orb:\n");
  51         print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
  52                        &private->orb, sizeof(private->orb), 0);
  53         printk(KERN_WARNING "cio: ccw device bus id: %s\n", cdev->dev.bus_id);
  54         printk(KERN_WARNING "cio: subchannel bus id: %s\n", sch->dev.bus_id);
  55         printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, "
  56                "vpm: %02x\n", sch->lpm, sch->opm, sch->vpm);
  57
  58         if ((void *)(addr_t)private->orb.cpa == &private->sense_ccw ||
  59             (void *)(addr_t)private->orb.cpa == cdev->private->iccws)
  60                 printk(KERN_WARNING "cio: last channel program (intern):\n");
  61         else
  62                 printk(KERN_WARNING "cio: last channel program:\n");
  63
  64         print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
  65                        (void *)(addr_t)private->orb.cpa,
  66                        sizeof(struct ccw1), 0);
  67         printk(KERN_WARNING "cio: ccw device state: %d\n",
  68                cdev->private->state);
  69         printk(KERN_WARNING "cio: store subchannel returned: cc=%d\n", cc);
  70         printk(KERN_WARNING "cio: schib:\n");
  71         print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
  72                        &schib, sizeof(schib), 0);
  73         printk(KERN_WARNING "cio: ccw device flags:\n");
  74         print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
  75                        &cdev->private->flags, sizeof(cdev->private->flags), 0);
  76 }
  77
  78 /*
  79  * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
  80  */
  81 static void
  82 ccw_device_timeout(unsigned long data)
  83 {
  84         struct ccw_device *cdev;
  85
  86         cdev = (struct ccw_device *) data;
  87         spin_lock_irq(cdev->ccwlock);
  88         if (timeout_log_enabled)
  89                 ccw_timeout_log(cdev);
  90         dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
  91         spin_unlock_irq(cdev->ccwlock);
  92 }
  93
  94 /*
  95  * Set timeout
  96  */
  97 void
  98 ccw_device_set_timeout(struct ccw_device *cdev, int expires)
  99 {
 100         if (expires == 0) {
 101                 del_timer(&cdev->private->timer);
 102                 return;
 103         }
 104         if (timer_pending(&cdev->private->timer)) {
 105                 if (mod_timer(&cdev->private->timer, jiffies + expires))
 106                         return;
 107         }
 108         cdev->private->timer.function = ccw_device_timeout;
 109         cdev->private->timer.data = (unsigned long) cdev;
 110         cdev->private->timer.expires = jiffies + expires;
 111         add_timer(&cdev->private->timer);
 112 }
 113
 114 /*
 115  * Cancel running i/o. This is called repeatedly since halt/clear are
 116  * asynchronous operations. We do one try with cio_cancel, two tries
 117  * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
 118  * Returns 0 if device now idle, -ENODEV for device not operational and
 119  * -EBUSY if an interrupt is expected (either from halt/clear or from a
 120  * status pending).
 121  */
 122 int
 123 ccw_device_cancel_halt_clear(struct ccw_device *cdev)
 124 {
 125         struct subchannel *sch;
 126         int ret;
 127
 128         sch = to_subchannel(cdev->dev.parent);
 129         ret = stsch(sch->schid, &sch->schib);
 130         if (ret || !sch->schib.pmcw.dnv)
 131                 return -ENODEV;
 132         if (!sch->schib.pmcw.ena)
 133                 /* Not operational -> done. */
 134                 return 0;
 135         /* Stage 1: cancel io. */
 136         if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) &&
 137             !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
 138                 ret = cio_cancel(sch);
 139                 if (ret != -EINVAL)
 140                         return ret;
 141                 /* cancel io unsuccessful. From now on it is asynchronous. */
 142                 cdev->private->iretry = 3;      /* 3 halt retries. */
 143         }
 144         if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
 145                 /* Stage 2: halt io. */
 146                 if (cdev->private->iretry) {
 147                         cdev->private->iretry--;
 148                         ret = cio_halt(sch);
 149                         if (ret != -EBUSY)
 150                                 return (ret == 0) ? -EBUSY : ret;
 151                 }
 152                 /* halt io unsuccessful. */
 153                 cdev->private->iretry = 255;    /* 255 clear retries. */
 154         }
 155         /* Stage 3: clear io. */
 156         if (cdev->private->iretry) {
 157                 cdev->private->iretry--;
 158                 ret = cio_clear (sch);
 159                 return (ret == 0) ? -EBUSY : ret;
 160         }
 161         panic("Can't stop i/o on subchannel.\n");
 162 }
 163
 164 static int
 165 ccw_device_handle_oper(struct ccw_device *cdev)
 166 {
 167         struct subchannel *sch;
 168
 169         sch = to_subchannel(cdev->dev.parent);
 170         cdev->private->flags.recog_done = 1;
 171         /*
 172          * Check if cu type and device type still match. If
 173          * not, it is certainly another device and we have to
 174          * de- and re-register.
 175          */
 176         if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
 177             cdev->id.cu_model != cdev->private->senseid.cu_model ||
 178             cdev->id.dev_type != cdev->private->senseid.dev_type ||
 179             cdev->id.dev_model != cdev->private->senseid.dev_model) {
 180                 PREPARE_WORK(&cdev->private->kick_work,
 181                              ccw_device_do_unreg_rereg);
 182                 queue_work(ccw_device_work, &cdev->private->kick_work);
 183                 return 0;
 184         }
 185         cdev->private->flags.donotify = 1;
 186         return 1;
 187 }
 188
 189 /*
 190  * The machine won't give us any notification by machine check if a chpid has
 191  * been varied online on the SE so we have to find out by magic (i. e. driving
 192  * the channel subsystem to device selection and updating our path masks).
 193  */
 194 static void
 195 __recover_lost_chpids(struct subchannel *sch, int old_lpm)
 196 {
 197         int mask, i;
 198         struct chp_id chpid;
 199
 200         chp_id_init(&chpid);
 201         for (i = 0; i<8; i++) {
 202                 mask = 0x80 >> i;
 203                 if (!(sch->lpm & mask))
 204                         continue;
 205                 if (old_lpm & mask)
 206                         continue;
 207                 chpid.id = sch->schib.pmcw.chpid[i];
 208                 if (!chp_is_registered(chpid))
 209                         css_schedule_eval_all();
 210         }
 211 }
 212
 213 /*
 214  * Stop device recognition.
 215  */
 216 static void
 217 ccw_device_recog_done(struct ccw_device *cdev, int state)
 218 {
 219         struct subchannel *sch;
 220         int notify, old_lpm, same_dev;
 221
 222         sch = to_subchannel(cdev->dev.parent);
 223
 224         ccw_device_set_timeout(cdev, 0);
 225         cio_disable_subchannel(sch);
 226         /*
 227          * Now that we tried recognition, we have performed device selection
 228          * through ssch() and the path information is up to date.
 229          */
 230         old_lpm = sch->lpm;
 231         stsch(sch->schid, &sch->schib);
 232         sch->lpm = sch->schib.pmcw.pam & sch->opm;
 233         /* Check since device may again have become not operational. */
 234         if (!sch->schib.pmcw.dnv)
 235                 state = DEV_STATE_NOT_OPER;
 236         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
 237                 /* Force reprobe on all chpids. */
 238                 old_lpm = 0;
 239         if (sch->lpm != old_lpm)
 240                 __recover_lost_chpids(sch, old_lpm);
 241         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 242                 if (state == DEV_STATE_NOT_OPER) {
 243                         cdev->private->flags.recog_done = 1;
 244                         cdev->private->state = DEV_STATE_DISCONNECTED;
 245                         return;
 246                 }
 247                 /* Boxed devices don't need extra treatment. */
 248         }
 249         notify = 0;
 250         same_dev = 0; /* Keep the compiler quiet... */
 251         switch (state) {
 252         case DEV_STATE_NOT_OPER:
 253                 CIO_MSG_EVENT(2, "SenseID : unknown device %04x on "
 254                               "subchannel 0.%x.%04x\n",
 255                               cdev->private->dev_id.devno,
 256                               sch->schid.ssid, sch->schid.sch_no);
 257                 break;
 258         case DEV_STATE_OFFLINE:
 259                 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 260                         same_dev = ccw_device_handle_oper(cdev);
 261                         notify = 1;
 262                 }
 263                 /* fill out sense information */
 264                 memset(&cdev->id, 0, sizeof(cdev->id));
 265                 cdev->id.cu_type   = cdev->private->senseid.cu_type;
 266                 cdev->id.cu_model  = cdev->private->senseid.cu_model;
 267                 cdev->id.dev_type  = cdev->private->senseid.dev_type;
 268                 cdev->id.dev_model = cdev->private->senseid.dev_model;
 269                 if (notify) {
 270                         cdev->private->state = DEV_STATE_OFFLINE;
 271                         if (same_dev) {
 272                                 /* Get device online again. */
 273                                 ccw_device_online(cdev);
 274                                 wake_up(&cdev->private->wait_q);
 275                         }
 276                         return;
 277                 }
 278                 /* Issue device info message. */
 279                 CIO_MSG_EVENT(4, "SenseID : device 0.%x.%04x reports: "
 280                               "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
 281                               "%04X/%02X\n",
 282                               cdev->private->dev_id.ssid,
 283                               cdev->private->dev_id.devno,
 284                               cdev->id.cu_type, cdev->id.cu_model,
 285                               cdev->id.dev_type, cdev->id.dev_model);
 286                 break;
 287         case DEV_STATE_BOXED:
 288                 CIO_MSG_EVENT(0, "SenseID : boxed device %04x on "
 289                               " subchannel 0.%x.%04x\n",
 290                               cdev->private->dev_id.devno,
 291                               sch->schid.ssid, sch->schid.sch_no);
 292                 break;
 293         }
 294         cdev->private->state = state;
 295         io_subchannel_recog_done(cdev);
 296         if (state != DEV_STATE_NOT_OPER)
 297                 wake_up(&cdev->private->wait_q);
 298 }
 299
 300 /*
 301  * Function called from device_id.c after sense id has completed.
 302  */
 303 void
 304 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
 305 {
 306         switch (err) {
 307         case 0:
 308                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
 309                 break;
 310         case -ETIME:            /* Sense id stopped by timeout. */
 311                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 312                 break;
 313         default:
 314                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 315                 break;
 316         }
 317 }
 318
 319 int ccw_device_notify(struct ccw_device *cdev, int event)
 320 {
 321         if (!cdev->drv)
 322                 return 0;
 323         if (!cdev->online)
 324                 return 0;
 325         return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0;
 326 }
 327
 328 static void
 329 ccw_device_oper_notify(struct work_struct *work)
 330 {
 331         struct ccw_device_private *priv;
 332         struct ccw_device *cdev;
 333         int ret;
 334         unsigned long flags;
 335
 336         priv = container_of(work, struct ccw_device_private, kick_work);
 337         cdev = priv->cdev;
 338         ret = ccw_device_notify(cdev, CIO_OPER);
 339         spin_lock_irqsave(cdev->ccwlock, flags);
 340         if (ret) {
 341                 /* Reenable channel measurements, if needed. */
 342                 spin_unlock_irqrestore(cdev->ccwlock, flags);
 343                 cmf_reenable(cdev);
 344                 spin_lock_irqsave(cdev->ccwlock, flags);
 345                 wake_up(&cdev->private->wait_q);
 346         }
 347         spin_unlock_irqrestore(cdev->ccwlock, flags);
 348         if (!ret)
 349                 /* Driver doesn't want device back. */
 350                 ccw_device_do_unreg_rereg(work);
 351 }
 352
 353 /*
 354  * Finished with online/offline processing.
 355  */
 356 static void
 357 ccw_device_done(struct ccw_device *cdev, int state)
 358 {
 359         struct subchannel *sch;
 360
 361         sch = to_subchannel(cdev->dev.parent);
 362
 363         ccw_device_set_timeout(cdev, 0);
 364
 365         if (state != DEV_STATE_ONLINE)
 366                 cio_disable_subchannel(sch);
 367
 368         /* Reset device status. */
 369         memset(&cdev->private->irb, 0, sizeof(struct irb));
 370
 371         cdev->private->state = state;
 372
 373
 374         if (state == DEV_STATE_BOXED)
 375                 CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n",
 376                               cdev->private->dev_id.devno, sch->schid.sch_no);
 377
 378         if (cdev->private->flags.donotify) {
 379                 cdev->private->flags.donotify = 0;
 380                 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify);
 381                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 382         }
 383         wake_up(&cdev->private->wait_q);
 384
 385         if (css_init_done && state != DEV_STATE_ONLINE)
 386                 put_device (&cdev->dev);
 387 }
 388
 389 static int cmp_pgid(struct pgid *p1, struct pgid *p2)
 390 {
 391         char *c1;
 392         char *c2;
 393
 394         c1 = (char *)p1;
 395         c2 = (char *)p2;
 396
 397         return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
 398 }
 399
 400 static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
 401 {
 402         int i;
 403         int last;
 404
 405         last = 0;
 406         for (i = 0; i < 8; i++) {
 407                 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
 408                         /* No PGID yet */
 409                         continue;
 410                 if (cdev->private->pgid[last].inf.ps.state1 ==
 411                     SNID_STATE1_RESET) {
 412                         /* First non-zero PGID */
 413                         last = i;
 414                         continue;
 415                 }
 416                 if (cmp_pgid(&cdev->private->pgid[i],
 417                              &cdev->private->pgid[last]) == 0)
 418                         /* Non-conflicting PGIDs */
 419                         continue;
 420
 421                 /* PGID mismatch, can't pathgroup. */
 422                 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
 423                               "0.%x.%04x, can't pathgroup\n",
 424                               cdev->private->dev_id.ssid,
 425                               cdev->private->dev_id.devno);
 426                 cdev->private->options.pgroup = 0;
 427                 return;
 428         }
 429         if (cdev->private->pgid[last].inf.ps.state1 ==
 430             SNID_STATE1_RESET)
 431                 /* No previous pgid found */
 432                 memcpy(&cdev->private->pgid[0],
 433                        &channel_subsystems[0]->global_pgid,
 434                        sizeof(struct pgid));
 435         else
 436                 /* Use existing pgid */
 437                 memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
 438                        sizeof(struct pgid));
 439 }
 440
 441 /*
 442  * Function called from device_pgid.c after sense path ground has completed.
 443  */
 444 void
 445 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
 446 {
 447         struct subchannel *sch;
 448
 449         sch = to_subchannel(cdev->dev.parent);
 450         switch (err) {
 451         case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
 452                 cdev->private->options.pgroup = 0;
 453                 break;
 454         case 0: /* success */
 455         case -EACCES: /* partial success, some paths not operational */
 456                 /* Check if all pgids are equal or 0. */
 457                 __ccw_device_get_common_pgid(cdev);
 458                 break;
 459         case -ETIME:            /* Sense path group id stopped by timeout. */
 460         case -EUSERS:           /* device is reserved for someone else. */
 461                 ccw_device_done(cdev, DEV_STATE_BOXED);
 462                 return;
 463         default:
 464                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 465                 return;
 466         }
 467         /* Start Path Group verification. */
 468         cdev->private->state = DEV_STATE_VERIFY;
 469         cdev->private->flags.doverify = 0;
 470         ccw_device_verify_start(cdev);
 471 }
 472
 473 /*
 474  * Start device recognition.
 475  */
 476 int
 477 ccw_device_recognition(struct ccw_device *cdev)
 478 {
 479         struct subchannel *sch;
 480         int ret;
 481
 482         if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
 483             (cdev->private->state != DEV_STATE_BOXED))
 484                 return -EINVAL;
 485         sch = to_subchannel(cdev->dev.parent);
 486         ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
 487         if (ret != 0)
 488                 /* Couldn't enable the subchannel for i/o. Sick device. */
 489                 return ret;
 490
 491         /* After 60s the device recognition is considered to have failed. */
 492         ccw_device_set_timeout(cdev, 60*HZ);
 493
 494         /*
 495          * We used to start here with a sense pgid to find out whether a device
 496          * is locked by someone else. Unfortunately, the sense pgid command
 497          * code has other meanings on devices predating the path grouping
 498          * algorithm, so we start with sense id and box the device after an
 499          * timeout (or if sense pgid during path verification detects the device
 500          * is locked, as may happen on newer devices).
 501          */
 502         cdev->private->flags.recog_done = 0;
 503         cdev->private->state = DEV_STATE_SENSE_ID;
 504         ccw_device_sense_id_start(cdev);
 505         return 0;
 506 }
 507
 508 /*
 509  * Handle timeout in device recognition.
 510  */
 511 static void
 512 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 513 {
 514         int ret;
 515
 516         ret = ccw_device_cancel_halt_clear(cdev);
 517         switch (ret) {
 518         case 0:
 519                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 520                 break;
 521         case -ENODEV:
 522                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 523                 break;
 524         default:
 525                 ccw_device_set_timeout(cdev, 3*HZ);
 526         }
 527 }
 528
 529
 530 void
 531 ccw_device_verify_done(struct ccw_device *cdev, int err)
 532 {
 533         struct subchannel *sch;
 534
 535         sch = to_subchannel(cdev->dev.parent);
 536         /* Update schib - pom may have changed. */
 537         stsch(sch->schid, &sch->schib);
 538         /* Update lpm with verified path mask. */
 539         sch->lpm = sch->vpm;
 540         /* Repeat path verification? */
 541         if (cdev->private->flags.doverify) {
 542                 cdev->private->flags.doverify = 0;
 543                 ccw_device_verify_start(cdev);
 544                 return;
 545         }
 546         switch (err) {
 547         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 548                 cdev->private->options.pgroup = 0;
 549         case 0:
 550                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 551                 /* Deliver fake irb to device driver, if needed. */
 552                 if (cdev->private->flags.fake_irb) {
 553                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 554                         cdev->private->irb.scsw.cc = 1;
 555                         cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC;
 556                         cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND;
 557                         cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND;
 558                         cdev->private->flags.fake_irb = 0;
 559                         if (cdev->handler)
 560                                 cdev->handler(cdev, cdev->private->intparm,
 561                                               &cdev->private->irb);
 562                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 563                 }
 564                 break;
 565         case -ETIME:
 566                 /* Reset oper notify indication after verify error. */
 567                 cdev->private->flags.donotify = 0;
 568                 ccw_device_done(cdev, DEV_STATE_BOXED);
 569                 break;
 570         default:
 571                 /* Reset oper notify indication after verify error. */
 572                 cdev->private->flags.donotify = 0;
 573                 if (cdev->online) {
 574                         ccw_device_set_timeout(cdev, 0);
 575                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 576                 } else
 577                         ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 578                 break;
 579         }
 580 }
 581
 582 /*
 583  * Get device online.
 584  */
 585 int
 586 ccw_device_online(struct ccw_device *cdev)
 587 {
 588         struct subchannel *sch;
 589         int ret;
 590
 591         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 592             (cdev->private->state != DEV_STATE_BOXED))
 593                 return -EINVAL;
 594         sch = to_subchannel(cdev->dev.parent);
 595         if (css_init_done && !get_device(&cdev->dev))
 596                 return -ENODEV;
 597         ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
 598         if (ret != 0) {
 599                 /* Couldn't enable the subchannel for i/o. Sick device. */
 600                 if (ret == -ENODEV)
 601                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 602                 return ret;
 603         }
 604         /* Do we want to do path grouping? */
 605         if (!cdev->private->options.pgroup) {
 606                 /* Start initial path verification. */
 607                 cdev->private->state = DEV_STATE_VERIFY;
 608                 cdev->private->flags.doverify = 0;
 609                 ccw_device_verify_start(cdev);
 610                 return 0;
 611         }
 612         /* Do a SensePGID first. */
 613         cdev->private->state = DEV_STATE_SENSE_PGID;
 614         ccw_device_sense_pgid_start(cdev);
 615         return 0;
 616 }
 617
 618 void
 619 ccw_device_disband_done(struct ccw_device *cdev, int err)
 620 {
 621         switch (err) {
 622         case 0:
 623                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 624                 break;
 625         case -ETIME:
 626                 ccw_device_done(cdev, DEV_STATE_BOXED);
 627                 break;
 628         default:
 629                 cdev->private->flags.donotify = 0;
 630                 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 631                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 632                 break;
 633         }
 634 }
 635
 636 /*
 637  * Shutdown device.
 638  */
 639 int
 640 ccw_device_offline(struct ccw_device *cdev)
 641 {
 642         struct subchannel *sch;
 643
 644         if (ccw_device_is_orphan(cdev)) {
 645                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 646                 return 0;
 647         }
 648         sch = to_subchannel(cdev->dev.parent);
 649         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
 650                 return -ENODEV;
 651         if (cdev->private->state != DEV_STATE_ONLINE) {
 652                 if (sch->schib.scsw.actl != 0)
 653                         return -EBUSY;
 654                 return -EINVAL;
 655         }
 656         if (sch->schib.scsw.actl != 0)
 657                 return -EBUSY;
 658         /* Are we doing path grouping? */
 659         if (!cdev->private->options.pgroup) {
 660                 /* No, set state offline immediately. */
 661                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 662                 return 0;
 663         }
 664         /* Start Set Path Group commands. */
 665         cdev->private->state = DEV_STATE_DISBAND_PGID;
 666         ccw_device_disband_start(cdev);
 667         return 0;
 668 }
 669
 670 /*
 671  * Handle timeout in device online/offline process.
 672  */
 673 static void
 674 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 675 {
 676         int ret;
 677
 678         ret = ccw_device_cancel_halt_clear(cdev);
 679         switch (ret) {
 680         case 0:
 681                 ccw_device_done(cdev, DEV_STATE_BOXED);
 682                 break;
 683         case -ENODEV:
 684                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 685                 break;
 686         default:
 687                 ccw_device_set_timeout(cdev, 3*HZ);
 688         }
 689 }
 690
 691 /*
 692  * Handle not oper event in device recognition.
 693  */
 694 static void
 695 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 696 {
 697         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 698 }
 699
 700 /*
 701  * Handle not operational event in non-special state.
 702  */
 703 static void ccw_device_generic_notoper(struct ccw_device *cdev,
 704                                        enum dev_event dev_event)
 705 {
 706         struct subchannel *sch;
 707
 708         cdev->private->state = DEV_STATE_NOT_OPER;
 709         sch = to_subchannel(cdev->dev.parent);
 710         css_schedule_eval(sch->schid);
 711 }
 712
 713 /*
 714  * Handle path verification event.
 715  */
 716 static void
 717 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 718 {
 719         struct subchannel *sch;
 720
 721         if (cdev->private->state == DEV_STATE_W4SENSE) {
 722                 cdev->private->flags.doverify = 1;
 723                 return;
 724         }
 725         sch = to_subchannel(cdev->dev.parent);
 726         /*
 727          * Since we might not just be coming from an interrupt from the
 728          * subchannel we have to update the schib.
 729          */
 730         stsch(sch->schid, &sch->schib);
 731
 732         if (sch->schib.scsw.actl != 0 ||
 733             (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) ||
 734             (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
 735                 /*
 736                  * No final status yet or final status not yet delivered
 737                  * to the device driver. Can't do path verfication now,
 738                  * delay until final status was delivered.
 739                  */
 740                 cdev->private->flags.doverify = 1;
 741                 return;
 742         }
 743         /* Device is idle, we can do the path verification. */
 744         cdev->private->state = DEV_STATE_VERIFY;
 745         cdev->private->flags.doverify = 0;
 746         ccw_device_verify_start(cdev);
 747 }
 748
 749 /*
 750  * Got an interrupt for a normal io (state online).
 751  */
 752 static void
 753 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 754 {
 755         struct irb *irb;
 756
 757         irb = (struct irb *) __LC_IRB;
 758         /* Check for unsolicited interrupt. */
 759         if ((irb->scsw.stctl ==
 760                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
 761             && (!irb->scsw.cc)) {
 762                 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 763                     !irb->esw.esw0.erw.cons) {
 764                         /* Unit check but no sense data. Need basic sense. */
 765                         if (ccw_device_do_sense(cdev, irb) != 0)
 766                                 goto call_handler_unsol;
 767                         memcpy(&cdev->private->irb, irb, sizeof(struct irb));
 768                         cdev->private->state = DEV_STATE_W4SENSE;
 769                         cdev->private->intparm = 0;
 770                         return;
 771                 }
 772 call_handler_unsol:
 773                 if (cdev->handler)
 774                         cdev->handler (cdev, 0, irb);
 775                 if (cdev->private->flags.doverify)
 776                         ccw_device_online_verify(cdev, 0);
 777                 return;
 778         }
 779         /* Accumulate status and find out if a basic sense is needed. */
 780         ccw_device_accumulate_irb(cdev, irb);
 781         if (cdev->private->flags.dosense) {
 782                 if (ccw_device_do_sense(cdev, irb) == 0) {
 783                         cdev->private->state = DEV_STATE_W4SENSE;
 784                 }
 785                 return;
 786         }
 787         /* Call the handler. */
 788         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 789                 /* Start delayed path verification. */
 790                 ccw_device_online_verify(cdev, 0);
 791 }
 792
 793 /*
 794  * Got an timeout in online state.
 795  */
 796 static void
 797 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 798 {
 799         int ret;
 800
 801         ccw_device_set_timeout(cdev, 0);
 802         ret = ccw_device_cancel_halt_clear(cdev);
 803         if (ret == -EBUSY) {
 804                 ccw_device_set_timeout(cdev, 3*HZ);
 805                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 806                 return;
 807         }
 808         if (ret == -ENODEV)
 809                 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 810         else if (cdev->handler)
 811                 cdev->handler(cdev, cdev->private->intparm,
 812                               ERR_PTR(-ETIMEDOUT));
 813 }
 814
 815 /*
 816  * Got an interrupt for a basic sense.
 817  */
 818 static void
 819 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 820 {
 821         struct irb *irb;
 822
 823         irb = (struct irb *) __LC_IRB;
 824         /* Check for unsolicited interrupt. */
 825         if (irb->scsw.stctl ==
 826                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 827                 if (irb->scsw.cc == 1)
 828                         /* Basic sense hasn't started. Try again. */
 829                         ccw_device_do_sense(cdev, irb);
 830                 else {
 831                         CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited "
 832                                       "interrupt during w4sense...\n",
 833                                       cdev->private->dev_id.ssid,
 834                                       cdev->private->dev_id.devno);
 835                         if (cdev->handler)
 836                                 cdev->handler (cdev, 0, irb);
 837                 }
 838                 return;
 839         }
 840         /*
 841          * Check if a halt or clear has been issued in the meanwhile. If yes,
 842          * only deliver the halt/clear interrupt to the device driver as if it
 843          * had killed the original request.
 844          */
 845         if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
 846                 /* Retry Basic Sense if requested. */
 847                 if (cdev->private->flags.intretry) {
 848                         cdev->private->flags.intretry = 0;
 849                         ccw_device_do_sense(cdev, irb);
 850                         return;
 851                 }
 852                 cdev->private->flags.dosense = 0;
 853                 memset(&cdev->private->irb, 0, sizeof(struct irb));
 854                 ccw_device_accumulate_irb(cdev, irb);
 855                 goto call_handler;
 856         }
 857         /* Add basic sense info to irb. */
 858         ccw_device_accumulate_basic_sense(cdev, irb);
 859         if (cdev->private->flags.dosense) {
 860                 /* Another basic sense is needed. */
 861                 ccw_device_do_sense(cdev, irb);
 862                 return;
 863         }
 864 call_handler:
 865         cdev->private->state = DEV_STATE_ONLINE;
 866         /* Call the handler. */
 867         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 868                 /* Start delayed path verification. */
 869                 ccw_device_online_verify(cdev, 0);
 870 }
 871
 872 static void
 873 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 874 {
 875         struct irb *irb;
 876
 877         irb = (struct irb *) __LC_IRB;
 878         /* Accumulate status. We don't do basic sense. */
 879         ccw_device_accumulate_irb(cdev, irb);
 880         /* Remember to clear irb to avoid residuals. */
 881         memset(&cdev->private->irb, 0, sizeof(struct irb));
 882         /* Try to start delayed device verification. */
 883         ccw_device_online_verify(cdev, 0);
 884         /* Note: Don't call handler for cio initiated clear! */
 885 }
 886
 887 static void
 888 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
 889 {
 890         struct subchannel *sch;
 891
 892         sch = to_subchannel(cdev->dev.parent);
 893         ccw_device_set_timeout(cdev, 0);
 894         /* Start delayed path verification. */
 895         ccw_device_online_verify(cdev, 0);
 896         /* OK, i/o is dead now. Call interrupt handler. */
 897         if (cdev->handler)
 898                 cdev->handler(cdev, cdev->private->intparm,
 899                               ERR_PTR(-EIO));
 900 }
 901
 902 static void
 903 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 904 {
 905         int ret;
 906
 907         ret = ccw_device_cancel_halt_clear(cdev);
 908         if (ret == -EBUSY) {
 909                 ccw_device_set_timeout(cdev, 3*HZ);
 910                 return;
 911         }
 912         /* Start delayed path verification. */
 913         ccw_device_online_verify(cdev, 0);
 914         if (cdev->handler)
 915                 cdev->handler(cdev, cdev->private->intparm,
 916                               ERR_PTR(-EIO));
 917 }
 918
 919 void ccw_device_kill_io(struct ccw_device *cdev)
 920 {
 921         int ret;
 922
 923         ret = ccw_device_cancel_halt_clear(cdev);
 924         if (ret == -EBUSY) {
 925                 ccw_device_set_timeout(cdev, 3*HZ);
 926                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 927                 return;
 928         }
 929         /* Start delayed path verification. */
 930         ccw_device_online_verify(cdev, 0);
 931         if (cdev->handler)
 932                 cdev->handler(cdev, cdev->private->intparm,
 933                               ERR_PTR(-EIO));
 934 }
 935
 936 static void
 937 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
 938 {
 939         /* Start verification after current task finished. */
 940         cdev->private->flags.doverify = 1;
 941 }
 942
 943 static void
 944 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
 945 {
 946         struct irb *irb;
 947
 948         switch (dev_event) {
 949         case DEV_EVENT_INTERRUPT:
 950                 irb = (struct irb *) __LC_IRB;
 951                 /* Check for unsolicited interrupt. */
 952                 if ((irb->scsw.stctl ==
 953                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
 954                     (!irb->scsw.cc))
 955                         /* FIXME: we should restart stlck here, but this
 956                          * is extremely unlikely ... */
 957                         goto out_wakeup;
 958
 959                 ccw_device_accumulate_irb(cdev, irb);
 960                 /* We don't care about basic sense etc. */
 961                 break;
 962         default: /* timeout */
 963                 break;
 964         }
 965 out_wakeup:
 966         wake_up(&cdev->private->wait_q);
 967 }
 968
 969 static void
 970 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
 971 {
 972         struct subchannel *sch;
 973
 974         sch = to_subchannel(cdev->dev.parent);
 975         if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0)
 976                 /* Couldn't enable the subchannel for i/o. Sick device. */
 977                 return;
 978
 979         /* After 60s the device recognition is considered to have failed. */
 980         ccw_device_set_timeout(cdev, 60*HZ);
 981
 982         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
 983         ccw_device_sense_id_start(cdev);
 984 }
 985
 986 void ccw_device_trigger_reprobe(struct ccw_device *cdev)
 987 {
 988         struct subchannel *sch;
 989
 990         if (cdev->private->state != DEV_STATE_DISCONNECTED)
 991                 return;
 992
 993         sch = to_subchannel(cdev->dev.parent);
 994         /* Update some values. */
 995         if (stsch(sch->schid, &sch->schib))
 996                 return;
 997         if (!sch->schib.pmcw.dnv)
 998                 return;
 999         /*
1000          * The pim, pam, pom values may not be accurate, but they are the best
1001          * we have before performing device selection :/
1002          */
1003         sch->lpm = sch->schib.pmcw.pam & sch->opm;
1004         /* Re-set some bits in the pmcw that were lost. */
1005         sch->schib.pmcw.csense = 1;
1006         sch->schib.pmcw.ena = 0;
1007         if ((sch->lpm & (sch->lpm - 1)) != 0)
1008                 sch->schib.pmcw.mp = 1;
1009         /* We should also udate ssd info, but this has to wait. */
1010         /* Check if this is another device which appeared on the same sch. */
1011         if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1012                 PREPARE_WORK(&cdev->private->kick_work,
1013                              ccw_device_move_to_orphanage);
1014                 queue_work(slow_path_wq, &cdev->private->kick_work);
1015         } else
1016                 ccw_device_start_id(cdev, 0);
1017 }
1018
1019 static void
1020 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1021 {
1022         struct subchannel *sch;
1023
1024         sch = to_subchannel(cdev->dev.parent);
1025         /*
1026          * An interrupt in state offline means a previous disable was not
1027          * successful. Try again.
1028          */
1029         cio_disable_subchannel(sch);
1030 }
1031
1032 static void
1033 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1034 {
1035         retry_set_schib(cdev);
1036         cdev->private->state = DEV_STATE_ONLINE;
1037         dev_fsm_event(cdev, dev_event);
1038 }
1039
1040 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1041                                        enum dev_event dev_event)
1042 {
1043         cmf_retry_copy_block(cdev);
1044         cdev->private->state = DEV_STATE_ONLINE;
1045         dev_fsm_event(cdev, dev_event);
1046 }
1047
1048 static void
1049 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1050 {
1051         ccw_device_set_timeout(cdev, 0);
1052         if (dev_event == DEV_EVENT_NOTOPER)
1053                 cdev->private->state = DEV_STATE_NOT_OPER;
1054         else
1055                 cdev->private->state = DEV_STATE_OFFLINE;
1056         wake_up(&cdev->private->wait_q);
1057 }
1058
1059 static void
1060 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1061 {
1062         int ret;
1063
1064         ret = ccw_device_cancel_halt_clear(cdev);
1065         switch (ret) {
1066         case 0:
1067                 cdev->private->state = DEV_STATE_OFFLINE;
1068                 wake_up(&cdev->private->wait_q);
1069                 break;
1070         case -ENODEV:
1071                 cdev->private->state = DEV_STATE_NOT_OPER;
1072                 wake_up(&cdev->private->wait_q);
1073                 break;
1074         default:
1075                 ccw_device_set_timeout(cdev, HZ/10);
1076         }
1077 }
1078
1079 /*
1080  * No operation action. This is used e.g. to ignore a timeout event in
1081  * state offline.
1082  */
1083 static void
1084 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1085 {
1086 }
1087
1088 /*
1089  * Bug operation action.
1090  */
1091 static void
1092 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1093 {
1094         CIO_MSG_EVENT(0, "Internal state [%i][%i] not handled for device "
1095                       "0.%x.%04x\n", cdev->private->state, dev_event,
1096                       cdev->private->dev_id.ssid,
1097                       cdev->private->dev_id.devno);
1098         BUG();
1099 }
1100
1101 /*
1102  * device statemachine
1103  */
1104 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1105         [DEV_STATE_NOT_OPER] = {
1106                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1107                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1108                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1109                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1110         },
1111         [DEV_STATE_SENSE_PGID] = {
1112                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1113                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1114                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1115                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1116         },
1117         [DEV_STATE_SENSE_ID] = {
1118                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1119                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1120                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1121                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1122         },
1123         [DEV_STATE_OFFLINE] = {
1124                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1125                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1126                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1127                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1128         },
1129         [DEV_STATE_VERIFY] = {
1130                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1131                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1132                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1133                 [DEV_EVENT_VERIFY]      = ccw_device_delay_verify,
1134         },
1135         [DEV_STATE_ONLINE] = {
1136                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1137                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1138                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1139                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1140         },
1141         [DEV_STATE_W4SENSE] = {
1142                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1143                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1144                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1145                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1146         },
1147         [DEV_STATE_DISBAND_PGID] = {
1148                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1149                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1150                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1151                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1152         },
1153         [DEV_STATE_BOXED] = {
1154                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1155                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1156                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1157                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1158         },
1159         /* states to wait for i/o completion before doing something */
1160         [DEV_STATE_CLEAR_VERIFY] = {
1161                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1162                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1163                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1164                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1165         },
1166         [DEV_STATE_TIMEOUT_KILL] = {
1167                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1168                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1169                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1170                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1171         },
1172         [DEV_STATE_QUIESCE] = {
1173                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1174                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1175                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1176                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1177         },
1178         /* special states for devices gone not operational */
1179         [DEV_STATE_DISCONNECTED] = {
1180                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1181                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1182                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1183                 [DEV_EVENT_VERIFY]      = ccw_device_start_id,
1184         },
1185         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1186                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1187                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1188                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1189                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1190         },
1191         [DEV_STATE_CMFCHANGE] = {
1192                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1193                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1194                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1195                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1196         },
1197         [DEV_STATE_CMFUPDATE] = {
1198                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1199                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1200                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1201                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1202         },
1203 };
1204
1205 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);