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