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   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/config.h>
  13 #include <linux/init.h>
  14 #include <linux/jiffies.h>
  15 #include <linux/string.h>
  16
  17 #include <asm/ccwdev.h>
  18 #include <asm/cio.h>
  19
  20 #include "cio.h"
  21 #include "cio_debug.h"
  22 #include "css.h"
  23 #include "device.h"
  24 #include "chsc.h"
  25 #include "ioasm.h"
  26
  27 int
  28 device_is_online(struct subchannel *sch)
  29 {
  30         struct ccw_device *cdev;
  31
  32         if (!sch->dev.driver_data)
  33                 return 0;
  34         cdev = sch->dev.driver_data;
  35         return (cdev->private->state == DEV_STATE_ONLINE);
  36 }
  37
  38 int
  39 device_is_disconnected(struct subchannel *sch)
  40 {
  41         struct ccw_device *cdev;
  42
  43         if (!sch->dev.driver_data)
  44                 return 0;
  45         cdev = sch->dev.driver_data;
  46         return (cdev->private->state == DEV_STATE_DISCONNECTED ||
  47                 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
  48 }
  49
  50 void
  51 device_set_disconnected(struct subchannel *sch)
  52 {
  53         struct ccw_device *cdev;
  54
  55         if (!sch->dev.driver_data)
  56                 return;
  57         cdev = sch->dev.driver_data;
  58         ccw_device_set_timeout(cdev, 0);
  59         cdev->private->flags.fake_irb = 0;
  60         cdev->private->state = DEV_STATE_DISCONNECTED;
  61 }
  62
  63 void
  64 device_set_waiting(struct subchannel *sch)
  65 {
  66         struct ccw_device *cdev;
  67
  68         if (!sch->dev.driver_data)
  69                 return;
  70         cdev = sch->dev.driver_data;
  71         ccw_device_set_timeout(cdev, 10*HZ);
  72         cdev->private->state = DEV_STATE_WAIT4IO;
  73 }
  74
  75 /*
  76  * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
  77  */
  78 static void
  79 ccw_device_timeout(unsigned long data)
  80 {
  81         struct ccw_device *cdev;
  82
  83         cdev = (struct ccw_device *) data;
  84         spin_lock_irq(cdev->ccwlock);
  85         dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
  86         spin_unlock_irq(cdev->ccwlock);
  87 }
  88
  89 /*
  90  * Set timeout
  91  */
  92 void
  93 ccw_device_set_timeout(struct ccw_device *cdev, int expires)
  94 {
  95         if (expires == 0) {
  96                 del_timer(&cdev->private->timer);
  97                 return;
  98         }
  99         if (timer_pending(&cdev->private->timer)) {
 100                 if (mod_timer(&cdev->private->timer, jiffies + expires))
 101                         return;
 102         }
 103         cdev->private->timer.function = ccw_device_timeout;
 104         cdev->private->timer.data = (unsigned long) cdev;
 105         cdev->private->timer.expires = jiffies + expires;
 106         add_timer(&cdev->private->timer);
 107 }
 108
 109 /* Kill any pending timers after machine check. */
 110 void
 111 device_kill_pending_timer(struct subchannel *sch)
 112 {
 113         struct ccw_device *cdev;
 114
 115         if (!sch->dev.driver_data)
 116                 return;
 117         cdev = sch->dev.driver_data;
 118         ccw_device_set_timeout(cdev, 0);
 119 }
 120
 121 /*
 122  * Cancel running i/o. This is called repeatedly since halt/clear are
 123  * asynchronous operations. We do one try with cio_cancel, two tries
 124  * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
 125  * Returns 0 if device now idle, -ENODEV for device not operational and
 126  * -EBUSY if an interrupt is expected (either from halt/clear or from a
 127  * status pending).
 128  */
 129 int
 130 ccw_device_cancel_halt_clear(struct ccw_device *cdev)
 131 {
 132         struct subchannel *sch;
 133         int ret;
 134
 135         sch = to_subchannel(cdev->dev.parent);
 136         ret = stsch(sch->schid, &sch->schib);
 137         if (ret || !sch->schib.pmcw.dnv)
 138                 return -ENODEV;
 139         if (!sch->schib.pmcw.ena || sch->schib.scsw.actl == 0)
 140                 /* Not operational or no activity -> done. */
 141                 return 0;
 142         /* Stage 1: cancel io. */
 143         if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) &&
 144             !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
 145                 ret = cio_cancel(sch);
 146                 if (ret != -EINVAL)
 147                         return ret;
 148                 /* cancel io unsuccessful. From now on it is asynchronous. */
 149                 cdev->private->iretry = 3;      /* 3 halt retries. */
 150         }
 151         if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
 152                 /* Stage 2: halt io. */
 153                 if (cdev->private->iretry) {
 154                         cdev->private->iretry--;
 155                         ret = cio_halt(sch);
 156                         return (ret == 0) ? -EBUSY : ret;
 157                 }
 158                 /* halt io unsuccessful. */
 159                 cdev->private->iretry = 255;    /* 255 clear retries. */
 160         }
 161         /* Stage 3: clear io. */
 162         if (cdev->private->iretry) {
 163                 cdev->private->iretry--;
 164                 ret = cio_clear (sch);
 165                 return (ret == 0) ? -EBUSY : ret;
 166         }
 167         panic("Can't stop i/o on subchannel.\n");
 168 }
 169
 170 static int
 171 ccw_device_handle_oper(struct ccw_device *cdev)
 172 {
 173         struct subchannel *sch;
 174
 175         sch = to_subchannel(cdev->dev.parent);
 176         cdev->private->flags.recog_done = 1;
 177         /*
 178          * Check if cu type and device type still match. If
 179          * not, it is certainly another device and we have to
 180          * de- and re-register. Also check here for non-matching devno.
 181          */
 182         if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
 183             cdev->id.cu_model != cdev->private->senseid.cu_model ||
 184             cdev->id.dev_type != cdev->private->senseid.dev_type ||
 185             cdev->id.dev_model != cdev->private->senseid.dev_model ||
 186             cdev->private->devno != sch->schib.pmcw.dev) {
 187                 PREPARE_WORK(&cdev->private->kick_work,
 188                              ccw_device_do_unreg_rereg, (void *)cdev);
 189                 queue_work(ccw_device_work, &cdev->private->kick_work);
 190                 return 0;
 191         }
 192         cdev->private->flags.donotify = 1;
 193         return 1;
 194 }
 195
 196 /*
 197  * The machine won't give us any notification by machine check if a chpid has
 198  * been varied online on the SE so we have to find out by magic (i. e. driving
 199  * the channel subsystem to device selection and updating our path masks).
 200  */
 201 static inline void
 202 __recover_lost_chpids(struct subchannel *sch, int old_lpm)
 203 {
 204         int mask, i;
 205
 206         for (i = 0; i<8; i++) {
 207                 mask = 0x80 >> i;
 208                 if (!(sch->lpm & mask))
 209                         continue;
 210                 if (old_lpm & mask)
 211                         continue;
 212                 chpid_is_actually_online(sch->schib.pmcw.chpid[i]);
 213         }
 214 }
 215
 216 /*
 217  * Stop device recognition.
 218  */
 219 static void
 220 ccw_device_recog_done(struct ccw_device *cdev, int state)
 221 {
 222         struct subchannel *sch;
 223         int notify, old_lpm, same_dev;
 224
 225         sch = to_subchannel(cdev->dev.parent);
 226
 227         ccw_device_set_timeout(cdev, 0);
 228         cio_disable_subchannel(sch);
 229         /*
 230          * Now that we tried recognition, we have performed device selection
 231          * through ssch() and the path information is up to date.
 232          */
 233         old_lpm = sch->lpm;
 234         stsch(sch->schid, &sch->schib);
 235         sch->lpm = sch->schib.pmcw.pim &
 236                 sch->schib.pmcw.pam &
 237                 sch->schib.pmcw.pom &
 238                 sch->opm;
 239         /* Check since device may again have become not operational. */
 240         if (!sch->schib.pmcw.dnv)
 241                 state = DEV_STATE_NOT_OPER;
 242         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
 243                 /* Force reprobe on all chpids. */
 244                 old_lpm = 0;
 245         if (sch->lpm != old_lpm)
 246                 __recover_lost_chpids(sch, old_lpm);
 247         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 248                 if (state == DEV_STATE_NOT_OPER) {
 249                         cdev->private->flags.recog_done = 1;
 250                         cdev->private->state = DEV_STATE_DISCONNECTED;
 251                         return;
 252                 }
 253                 /* Boxed devices don't need extra treatment. */
 254         }
 255         notify = 0;
 256         same_dev = 0; /* Keep the compiler quiet... */
 257         switch (state) {
 258         case DEV_STATE_NOT_OPER:
 259                 CIO_DEBUG(KERN_WARNING, 2,
 260                           "SenseID : unknown device %04x on subchannel "
 261                           "0.%x.%04x\n", cdev->private->devno,
 262                           sch->schid.ssid, sch->schid.sch_no);
 263                 break;
 264         case DEV_STATE_OFFLINE:
 265                 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 266                         same_dev = ccw_device_handle_oper(cdev);
 267                         notify = 1;
 268                 }
 269                 /* fill out sense information */
 270                 cdev->id = (struct ccw_device_id) {
 271                         .cu_type   = cdev->private->senseid.cu_type,
 272                         .cu_model  = cdev->private->senseid.cu_model,
 273                         .dev_type  = cdev->private->senseid.dev_type,
 274                         .dev_model = cdev->private->senseid.dev_model,
 275                 };
 276                 if (notify) {
 277                         cdev->private->state = DEV_STATE_OFFLINE;
 278                         if (same_dev) {
 279                                 /* Get device online again. */
 280                                 ccw_device_online(cdev);
 281                                 wake_up(&cdev->private->wait_q);
 282                         }
 283                         return;
 284                 }
 285                 /* Issue device info message. */
 286                 CIO_DEBUG(KERN_INFO, 2, "SenseID : device 0.%x.%04x reports: "
 287                           "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
 288                           "%04X/%02X\n",
 289                           cdev->private->ssid, cdev->private->devno,
 290                           cdev->id.cu_type, cdev->id.cu_model,
 291                           cdev->id.dev_type, cdev->id.dev_model);
 292                 break;
 293         case DEV_STATE_BOXED:
 294                 CIO_DEBUG(KERN_WARNING, 2,
 295                           "SenseID : boxed device %04x on subchannel "
 296                           "0.%x.%04x\n", cdev->private->devno,
 297                           sch->schid.ssid, sch->schid.sch_no);
 298                 break;
 299         }
 300         cdev->private->state = state;
 301         io_subchannel_recog_done(cdev);
 302         if (state != DEV_STATE_NOT_OPER)
 303                 wake_up(&cdev->private->wait_q);
 304 }
 305
 306 /*
 307  * Function called from device_id.c after sense id has completed.
 308  */
 309 void
 310 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
 311 {
 312         switch (err) {
 313         case 0:
 314                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
 315                 break;
 316         case -ETIME:            /* Sense id stopped by timeout. */
 317                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 318                 break;
 319         default:
 320                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 321                 break;
 322         }
 323 }
 324
 325 static void
 326 ccw_device_oper_notify(void *data)
 327 {
 328         struct ccw_device *cdev;
 329         struct subchannel *sch;
 330         int ret;
 331
 332         cdev = (struct ccw_device *)data;
 333         sch = to_subchannel(cdev->dev.parent);
 334         ret = (sch->driver && sch->driver->notify) ?
 335                 sch->driver->notify(&sch->dev, CIO_OPER) : 0;
 336         if (!ret)
 337                 /* Driver doesn't want device back. */
 338                 ccw_device_do_unreg_rereg((void *)cdev);
 339         else {
 340                 /* Reenable channel measurements, if needed. */
 341                 cmf_reenable(cdev);
 342                 wake_up(&cdev->private->wait_q);
 343         }
 344 }
 345
 346 /*
 347  * Finished with online/offline processing.
 348  */
 349 static void
 350 ccw_device_done(struct ccw_device *cdev, int state)
 351 {
 352         struct subchannel *sch;
 353
 354         sch = to_subchannel(cdev->dev.parent);
 355
 356         if (state != DEV_STATE_ONLINE)
 357                 cio_disable_subchannel(sch);
 358
 359         /* Reset device status. */
 360         memset(&cdev->private->irb, 0, sizeof(struct irb));
 361
 362         cdev->private->state = state;
 363
 364
 365         if (state == DEV_STATE_BOXED)
 366                 CIO_DEBUG(KERN_WARNING, 2,
 367                           "Boxed device %04x on subchannel %04x\n",
 368                           cdev->private->devno, sch->schid.sch_no);
 369
 370         if (cdev->private->flags.donotify) {
 371                 cdev->private->flags.donotify = 0;
 372                 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify,
 373                              (void *)cdev);
 374                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 375         }
 376         wake_up(&cdev->private->wait_q);
 377
 378         if (css_init_done && state != DEV_STATE_ONLINE)
 379                 put_device (&cdev->dev);
 380 }
 381
 382 /*
 383  * Function called from device_pgid.c after sense path ground has completed.
 384  */
 385 void
 386 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
 387 {
 388         struct subchannel *sch;
 389
 390         sch = to_subchannel(cdev->dev.parent);
 391         switch (err) {
 392         case 0:
 393                 /* Start Path Group verification. */
 394                 sch->vpm = 0;   /* Start with no path groups set. */
 395                 cdev->private->state = DEV_STATE_VERIFY;
 396                 ccw_device_verify_start(cdev);
 397                 break;
 398         case -ETIME:            /* Sense path group id stopped by timeout. */
 399         case -EUSERS:           /* device is reserved for someone else. */
 400                 ccw_device_done(cdev, DEV_STATE_BOXED);
 401                 break;
 402         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 403                 cdev->private->options.pgroup = 0;
 404                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 405                 break;
 406         default:
 407                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 408                 break;
 409         }
 410 }
 411
 412 /*
 413  * Start device recognition.
 414  */
 415 int
 416 ccw_device_recognition(struct ccw_device *cdev)
 417 {
 418         struct subchannel *sch;
 419         int ret;
 420
 421         if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
 422             (cdev->private->state != DEV_STATE_BOXED))
 423                 return -EINVAL;
 424         sch = to_subchannel(cdev->dev.parent);
 425         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 426         if (ret != 0)
 427                 /* Couldn't enable the subchannel for i/o. Sick device. */
 428                 return ret;
 429
 430         /* After 60s the device recognition is considered to have failed. */
 431         ccw_device_set_timeout(cdev, 60*HZ);
 432
 433         /*
 434          * We used to start here with a sense pgid to find out whether a device
 435          * is locked by someone else. Unfortunately, the sense pgid command
 436          * code has other meanings on devices predating the path grouping
 437          * algorithm, so we start with sense id and box the device after an
 438          * timeout (or if sense pgid during path verification detects the device
 439          * is locked, as may happen on newer devices).
 440          */
 441         cdev->private->flags.recog_done = 0;
 442         cdev->private->state = DEV_STATE_SENSE_ID;
 443         ccw_device_sense_id_start(cdev);
 444         return 0;
 445 }
 446
 447 /*
 448  * Handle timeout in device recognition.
 449  */
 450 static void
 451 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 452 {
 453         int ret;
 454
 455         ret = ccw_device_cancel_halt_clear(cdev);
 456         switch (ret) {
 457         case 0:
 458                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 459                 break;
 460         case -ENODEV:
 461                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 462                 break;
 463         default:
 464                 ccw_device_set_timeout(cdev, 3*HZ);
 465         }
 466 }
 467
 468
 469 static void
 470 ccw_device_nopath_notify(void *data)
 471 {
 472         struct ccw_device *cdev;
 473         struct subchannel *sch;
 474         int ret;
 475
 476         cdev = (struct ccw_device *)data;
 477         sch = to_subchannel(cdev->dev.parent);
 478         /* Extra sanity. */
 479         if (sch->lpm)
 480                 return;
 481         ret = (sch->driver && sch->driver->notify) ?
 482                 sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0;
 483         if (!ret) {
 484                 if (get_device(&sch->dev)) {
 485                         /* Driver doesn't want to keep device. */
 486                         cio_disable_subchannel(sch);
 487                         if (get_device(&cdev->dev)) {
 488                                 PREPARE_WORK(&cdev->private->kick_work,
 489                                              ccw_device_call_sch_unregister,
 490                                              (void *)cdev);
 491                                 queue_work(ccw_device_work,
 492                                            &cdev->private->kick_work);
 493                         } else
 494                                 put_device(&sch->dev);
 495                 }
 496         } else {
 497                 cio_disable_subchannel(sch);
 498                 ccw_device_set_timeout(cdev, 0);
 499                 cdev->private->flags.fake_irb = 0;
 500                 cdev->private->state = DEV_STATE_DISCONNECTED;
 501                 wake_up(&cdev->private->wait_q);
 502         }
 503 }
 504
 505 void
 506 ccw_device_verify_done(struct ccw_device *cdev, int err)
 507 {
 508         cdev->private->flags.doverify = 0;
 509         switch (err) {
 510         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 511                 cdev->private->options.pgroup = 0;
 512         case 0:
 513                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 514                 /* Deliver fake irb to device driver, if needed. */
 515                 if (cdev->private->flags.fake_irb) {
 516                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 517                         cdev->private->irb.scsw = (struct scsw) {
 518                                 .cc = 1,
 519                                 .fctl = SCSW_FCTL_START_FUNC,
 520                                 .actl = SCSW_ACTL_START_PEND,
 521                                 .stctl = SCSW_STCTL_STATUS_PEND,
 522                         };
 523                         cdev->private->flags.fake_irb = 0;
 524                         if (cdev->handler)
 525                                 cdev->handler(cdev, cdev->private->intparm,
 526                                               &cdev->private->irb);
 527                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 528                 }
 529                 break;
 530         case -ETIME:
 531                 ccw_device_done(cdev, DEV_STATE_BOXED);
 532                 break;
 533         default:
 534                 PREPARE_WORK(&cdev->private->kick_work,
 535                              ccw_device_nopath_notify, (void *)cdev);
 536                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 537                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 538                 break;
 539         }
 540 }
 541
 542 /*
 543  * Get device online.
 544  */
 545 int
 546 ccw_device_online(struct ccw_device *cdev)
 547 {
 548         struct subchannel *sch;
 549         int ret;
 550
 551         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 552             (cdev->private->state != DEV_STATE_BOXED))
 553                 return -EINVAL;
 554         sch = to_subchannel(cdev->dev.parent);
 555         if (css_init_done && !get_device(&cdev->dev))
 556                 return -ENODEV;
 557         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 558         if (ret != 0) {
 559                 /* Couldn't enable the subchannel for i/o. Sick device. */
 560                 if (ret == -ENODEV)
 561                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 562                 return ret;
 563         }
 564         /* Do we want to do path grouping? */
 565         if (!cdev->private->options.pgroup) {
 566                 /* No, set state online immediately. */
 567                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 568                 return 0;
 569         }
 570         /* Do a SensePGID first. */
 571         cdev->private->state = DEV_STATE_SENSE_PGID;
 572         ccw_device_sense_pgid_start(cdev);
 573         return 0;
 574 }
 575
 576 void
 577 ccw_device_disband_done(struct ccw_device *cdev, int err)
 578 {
 579         switch (err) {
 580         case 0:
 581                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 582                 break;
 583         case -ETIME:
 584                 ccw_device_done(cdev, DEV_STATE_BOXED);
 585                 break;
 586         default:
 587                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 588                 break;
 589         }
 590 }
 591
 592 /*
 593  * Shutdown device.
 594  */
 595 int
 596 ccw_device_offline(struct ccw_device *cdev)
 597 {
 598         struct subchannel *sch;
 599
 600         sch = to_subchannel(cdev->dev.parent);
 601         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
 602                 return -ENODEV;
 603         if (cdev->private->state != DEV_STATE_ONLINE) {
 604                 if (sch->schib.scsw.actl != 0)
 605                         return -EBUSY;
 606                 return -EINVAL;
 607         }
 608         if (sch->schib.scsw.actl != 0)
 609                 return -EBUSY;
 610         /* Are we doing path grouping? */
 611         if (!cdev->private->options.pgroup) {
 612                 /* No, set state offline immediately. */
 613                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 614                 return 0;
 615         }
 616         /* Start Set Path Group commands. */
 617         cdev->private->state = DEV_STATE_DISBAND_PGID;
 618         ccw_device_disband_start(cdev);
 619         return 0;
 620 }
 621
 622 /*
 623  * Handle timeout in device online/offline process.
 624  */
 625 static void
 626 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 627 {
 628         int ret;
 629
 630         ret = ccw_device_cancel_halt_clear(cdev);
 631         switch (ret) {
 632         case 0:
 633                 ccw_device_done(cdev, DEV_STATE_BOXED);
 634                 break;
 635         case -ENODEV:
 636                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 637                 break;
 638         default:
 639                 ccw_device_set_timeout(cdev, 3*HZ);
 640         }
 641 }
 642
 643 /*
 644  * Handle not oper event in device recognition.
 645  */
 646 static void
 647 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 648 {
 649         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 650 }
 651
 652 /*
 653  * Handle not operational event while offline.
 654  */
 655 static void
 656 ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 657 {
 658         struct subchannel *sch;
 659
 660         cdev->private->state = DEV_STATE_NOT_OPER;
 661         sch = to_subchannel(cdev->dev.parent);
 662         if (get_device(&cdev->dev)) {
 663                 PREPARE_WORK(&cdev->private->kick_work,
 664                              ccw_device_call_sch_unregister, (void *)cdev);
 665                 queue_work(ccw_device_work, &cdev->private->kick_work);
 666         }
 667         wake_up(&cdev->private->wait_q);
 668 }
 669
 670 /*
 671  * Handle not operational event while online.
 672  */
 673 static void
 674 ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 675 {
 676         struct subchannel *sch;
 677
 678         sch = to_subchannel(cdev->dev.parent);
 679         if (sch->driver->notify &&
 680             sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) {
 681                         ccw_device_set_timeout(cdev, 0);
 682                         cdev->private->flags.fake_irb = 0;
 683                         cdev->private->state = DEV_STATE_DISCONNECTED;
 684                         wake_up(&cdev->private->wait_q);
 685                         return;
 686         }
 687         cdev->private->state = DEV_STATE_NOT_OPER;
 688         cio_disable_subchannel(sch);
 689         if (sch->schib.scsw.actl != 0) {
 690                 // FIXME: not-oper indication to device driver ?
 691                 ccw_device_call_handler(cdev);
 692         }
 693         if (get_device(&cdev->dev)) {
 694                 PREPARE_WORK(&cdev->private->kick_work,
 695                              ccw_device_call_sch_unregister, (void *)cdev);
 696                 queue_work(ccw_device_work, &cdev->private->kick_work);
 697         }
 698         wake_up(&cdev->private->wait_q);
 699 }
 700
 701 /*
 702  * Handle path verification event.
 703  */
 704 static void
 705 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 706 {
 707         struct subchannel *sch;
 708
 709         if (!cdev->private->options.pgroup)
 710                 return;
 711         if (cdev->private->state == DEV_STATE_W4SENSE) {
 712                 cdev->private->flags.doverify = 1;
 713                 return;
 714         }
 715         sch = to_subchannel(cdev->dev.parent);
 716         /*
 717          * Since we might not just be coming from an interrupt from the
 718          * subchannel we have to update the schib.
 719          */
 720         stsch(sch->schid, &sch->schib);
 721
 722         if (sch->schib.scsw.actl != 0 ||
 723             (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
 724                 /*
 725                  * No final status yet or final status not yet delivered
 726                  * to the device driver. Can't do path verfication now,
 727                  * delay until final status was delivered.
 728                  */
 729                 cdev->private->flags.doverify = 1;
 730                 return;
 731         }
 732         /* Device is idle, we can do the path verification. */
 733         cdev->private->state = DEV_STATE_VERIFY;
 734         ccw_device_verify_start(cdev);
 735 }
 736
 737 /*
 738  * Got an interrupt for a normal io (state online).
 739  */
 740 static void
 741 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 742 {
 743         struct irb *irb;
 744
 745         irb = (struct irb *) __LC_IRB;
 746         /* Check for unsolicited interrupt. */
 747         if ((irb->scsw.stctl ==
 748                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
 749             && (!irb->scsw.cc)) {
 750                 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 751                     !irb->esw.esw0.erw.cons) {
 752                         /* Unit check but no sense data. Need basic sense. */
 753                         if (ccw_device_do_sense(cdev, irb) != 0)
 754                                 goto call_handler_unsol;
 755                         memcpy(&cdev->private->irb, irb, sizeof(struct irb));
 756                         cdev->private->state = DEV_STATE_W4SENSE;
 757                         cdev->private->intparm = 0;
 758                         return;
 759                 }
 760 call_handler_unsol:
 761                 if (cdev->handler)
 762                         cdev->handler (cdev, 0, irb);
 763                 return;
 764         }
 765         /* Accumulate status and find out if a basic sense is needed. */
 766         ccw_device_accumulate_irb(cdev, irb);
 767         if (cdev->private->flags.dosense) {
 768                 if (ccw_device_do_sense(cdev, irb) == 0) {
 769                         cdev->private->state = DEV_STATE_W4SENSE;
 770                 }
 771                 return;
 772         }
 773         /* Call the handler. */
 774         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 775                 /* Start delayed path verification. */
 776                 ccw_device_online_verify(cdev, 0);
 777 }
 778
 779 /*
 780  * Got an timeout in online state.
 781  */
 782 static void
 783 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 784 {
 785         int ret;
 786
 787         ccw_device_set_timeout(cdev, 0);
 788         ret = ccw_device_cancel_halt_clear(cdev);
 789         if (ret == -EBUSY) {
 790                 ccw_device_set_timeout(cdev, 3*HZ);
 791                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 792                 return;
 793         }
 794         if (ret == -ENODEV) {
 795                 struct subchannel *sch;
 796
 797                 sch = to_subchannel(cdev->dev.parent);
 798                 if (!sch->lpm) {
 799                         PREPARE_WORK(&cdev->private->kick_work,
 800                                      ccw_device_nopath_notify, (void *)cdev);
 801                         queue_work(ccw_device_notify_work,
 802                                    &cdev->private->kick_work);
 803                 } else
 804                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 805         } else if (cdev->handler)
 806                 cdev->handler(cdev, cdev->private->intparm,
 807                               ERR_PTR(-ETIMEDOUT));
 808 }
 809
 810 /*
 811  * Got an interrupt for a basic sense.
 812  */
 813 void
 814 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 815 {
 816         struct irb *irb;
 817
 818         irb = (struct irb *) __LC_IRB;
 819         /* Check for unsolicited interrupt. */
 820         if (irb->scsw.stctl ==
 821                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 822                 if (irb->scsw.cc == 1)
 823                         /* Basic sense hasn't started. Try again. */
 824                         ccw_device_do_sense(cdev, irb);
 825                 else {
 826                         printk("Huh? %s(%s): unsolicited interrupt...\n",
 827                                __FUNCTION__, cdev->dev.bus_id);
 828                         if (cdev->handler)
 829                                 cdev->handler (cdev, 0, irb);
 830                 }
 831                 return;
 832         }
 833         /*
 834          * Check if a halt or clear has been issued in the meanwhile. If yes,
 835          * only deliver the halt/clear interrupt to the device driver as if it
 836          * had killed the original request.
 837          */
 838         if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
 839                 cdev->private->flags.dosense = 0;
 840                 memset(&cdev->private->irb, 0, sizeof(struct irb));
 841                 ccw_device_accumulate_irb(cdev, irb);
 842                 goto call_handler;
 843         }
 844         /* Add basic sense info to irb. */
 845         ccw_device_accumulate_basic_sense(cdev, irb);
 846         if (cdev->private->flags.dosense) {
 847                 /* Another basic sense is needed. */
 848                 ccw_device_do_sense(cdev, irb);
 849                 return;
 850         }
 851 call_handler:
 852         cdev->private->state = DEV_STATE_ONLINE;
 853         /* Call the handler. */
 854         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 855                 /* Start delayed path verification. */
 856                 ccw_device_online_verify(cdev, 0);
 857 }
 858
 859 static void
 860 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 861 {
 862         struct irb *irb;
 863
 864         irb = (struct irb *) __LC_IRB;
 865         /* Accumulate status. We don't do basic sense. */
 866         ccw_device_accumulate_irb(cdev, irb);
 867         /* Remember to clear irb to avoid residuals. */
 868         memset(&cdev->private->irb, 0, sizeof(struct irb));
 869         /* Try to start delayed device verification. */
 870         ccw_device_online_verify(cdev, 0);
 871         /* Note: Don't call handler for cio initiated clear! */
 872 }
 873
 874 static void
 875 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
 876 {
 877         struct subchannel *sch;
 878
 879         sch = to_subchannel(cdev->dev.parent);
 880         ccw_device_set_timeout(cdev, 0);
 881         /* OK, i/o is dead now. Call interrupt handler. */
 882         cdev->private->state = DEV_STATE_ONLINE;
 883         if (cdev->handler)
 884                 cdev->handler(cdev, cdev->private->intparm,
 885                               ERR_PTR(-ETIMEDOUT));
 886         if (!sch->lpm) {
 887                 PREPARE_WORK(&cdev->private->kick_work,
 888                              ccw_device_nopath_notify, (void *)cdev);
 889                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 890         } else if (cdev->private->flags.doverify)
 891                 /* Start delayed path verification. */
 892                 ccw_device_online_verify(cdev, 0);
 893 }
 894
 895 static void
 896 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 897 {
 898         int ret;
 899
 900         ret = ccw_device_cancel_halt_clear(cdev);
 901         if (ret == -EBUSY) {
 902                 ccw_device_set_timeout(cdev, 3*HZ);
 903                 return;
 904         }
 905         if (ret == -ENODEV) {
 906                 struct subchannel *sch;
 907
 908                 sch = to_subchannel(cdev->dev.parent);
 909                 if (!sch->lpm) {
 910                         PREPARE_WORK(&cdev->private->kick_work,
 911                                      ccw_device_nopath_notify, (void *)cdev);
 912                         queue_work(ccw_device_notify_work,
 913                                    &cdev->private->kick_work);
 914                 } else
 915                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 916                 return;
 917         }
 918         //FIXME: Can we get here?
 919         cdev->private->state = DEV_STATE_ONLINE;
 920         if (cdev->handler)
 921                 cdev->handler(cdev, cdev->private->intparm,
 922                               ERR_PTR(-ETIMEDOUT));
 923 }
 924
 925 static void
 926 ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event)
 927 {
 928         struct irb *irb;
 929         struct subchannel *sch;
 930
 931         irb = (struct irb *) __LC_IRB;
 932         /*
 933          * Accumulate status and find out if a basic sense is needed.
 934          * This is fine since we have already adapted the lpm.
 935          */
 936         ccw_device_accumulate_irb(cdev, irb);
 937         if (cdev->private->flags.dosense) {
 938                 if (ccw_device_do_sense(cdev, irb) == 0) {
 939                         cdev->private->state = DEV_STATE_W4SENSE;
 940                 }
 941                 return;
 942         }
 943
 944         /* Iff device is idle, reset timeout. */
 945         sch = to_subchannel(cdev->dev.parent);
 946         if (!stsch(sch->schid, &sch->schib))
 947                 if (sch->schib.scsw.actl == 0)
 948                         ccw_device_set_timeout(cdev, 0);
 949         /* Call the handler. */
 950         ccw_device_call_handler(cdev);
 951         if (!sch->lpm) {
 952                 PREPARE_WORK(&cdev->private->kick_work,
 953                              ccw_device_nopath_notify, (void *)cdev);
 954                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 955         } else if (cdev->private->flags.doverify)
 956                 ccw_device_online_verify(cdev, 0);
 957 }
 958
 959 static void
 960 ccw_device_wait4io_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 961 {
 962         int ret;
 963         struct subchannel *sch;
 964
 965         sch = to_subchannel(cdev->dev.parent);
 966         ccw_device_set_timeout(cdev, 0);
 967         ret = ccw_device_cancel_halt_clear(cdev);
 968         if (ret == -EBUSY) {
 969                 ccw_device_set_timeout(cdev, 3*HZ);
 970                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 971                 return;
 972         }
 973         if (ret == -ENODEV) {
 974                 if (!sch->lpm) {
 975                         PREPARE_WORK(&cdev->private->kick_work,
 976                                      ccw_device_nopath_notify, (void *)cdev);
 977                         queue_work(ccw_device_notify_work,
 978                                    &cdev->private->kick_work);
 979                 } else
 980                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 981                 return;
 982         }
 983         if (cdev->handler)
 984                 cdev->handler(cdev, cdev->private->intparm,
 985                               ERR_PTR(-ETIMEDOUT));
 986         if (!sch->lpm) {
 987                 PREPARE_WORK(&cdev->private->kick_work,
 988                              ccw_device_nopath_notify, (void *)cdev);
 989                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 990         } else if (cdev->private->flags.doverify)
 991                 /* Start delayed path verification. */
 992                 ccw_device_online_verify(cdev, 0);
 993 }
 994
 995 static void
 996 ccw_device_wait4io_verify(struct ccw_device *cdev, enum dev_event dev_event)
 997 {
 998         /* When the I/O has terminated, we have to start verification. */
 999         if (cdev->private->options.pgroup)
1000                 cdev->private->flags.doverify = 1;
1001 }
1002
1003 static void
1004 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1005 {
1006         struct irb *irb;
1007
1008         switch (dev_event) {
1009         case DEV_EVENT_INTERRUPT:
1010                 irb = (struct irb *) __LC_IRB;
1011                 /* Check for unsolicited interrupt. */
1012                 if ((irb->scsw.stctl ==
1013                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1014                     (!irb->scsw.cc))
1015                         /* FIXME: we should restart stlck here, but this
1016                          * is extremely unlikely ... */
1017                         goto out_wakeup;
1018
1019                 ccw_device_accumulate_irb(cdev, irb);
1020                 /* We don't care about basic sense etc. */
1021                 break;
1022         default: /* timeout */
1023                 break;
1024         }
1025 out_wakeup:
1026         wake_up(&cdev->private->wait_q);
1027 }
1028
1029 static void
1030 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1031 {
1032         struct subchannel *sch;
1033
1034         sch = to_subchannel(cdev->dev.parent);
1035         if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1036                 /* Couldn't enable the subchannel for i/o. Sick device. */
1037                 return;
1038
1039         /* After 60s the device recognition is considered to have failed. */
1040         ccw_device_set_timeout(cdev, 60*HZ);
1041
1042         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1043         ccw_device_sense_id_start(cdev);
1044 }
1045
1046 void
1047 device_trigger_reprobe(struct subchannel *sch)
1048 {
1049         struct ccw_device *cdev;
1050
1051         if (!sch->dev.driver_data)
1052                 return;
1053         cdev = sch->dev.driver_data;
1054         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1055                 return;
1056
1057         /* Update some values. */
1058         if (stsch(sch->schid, &sch->schib))
1059                 return;
1060
1061         /*
1062          * The pim, pam, pom values may not be accurate, but they are the best
1063          * we have before performing device selection :/
1064          */
1065         sch->lpm = sch->schib.pmcw.pim &
1066                 sch->schib.pmcw.pam &
1067                 sch->schib.pmcw.pom &
1068                 sch->opm;
1069         /* Re-set some bits in the pmcw that were lost. */
1070         sch->schib.pmcw.isc = 3;
1071         sch->schib.pmcw.csense = 1;
1072         sch->schib.pmcw.ena = 0;
1073         if ((sch->lpm & (sch->lpm - 1)) != 0)
1074                 sch->schib.pmcw.mp = 1;
1075         sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1076         /* We should also udate ssd info, but this has to wait. */
1077         ccw_device_start_id(cdev, 0);
1078 }
1079
1080 static void
1081 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1082 {
1083         struct subchannel *sch;
1084
1085         sch = to_subchannel(cdev->dev.parent);
1086         /*
1087          * An interrupt in state offline means a previous disable was not
1088          * successful. Try again.
1089          */
1090         cio_disable_subchannel(sch);
1091 }
1092
1093 static void
1094 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1095 {
1096         retry_set_schib(cdev);
1097         cdev->private->state = DEV_STATE_ONLINE;
1098         dev_fsm_event(cdev, dev_event);
1099 }
1100
1101 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1102                                        enum dev_event dev_event)
1103 {
1104         cmf_retry_copy_block(cdev);
1105         cdev->private->state = DEV_STATE_ONLINE;
1106         dev_fsm_event(cdev, dev_event);
1107 }
1108
1109 static void
1110 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1111 {
1112         ccw_device_set_timeout(cdev, 0);
1113         if (dev_event == DEV_EVENT_NOTOPER)
1114                 cdev->private->state = DEV_STATE_NOT_OPER;
1115         else
1116                 cdev->private->state = DEV_STATE_OFFLINE;
1117         wake_up(&cdev->private->wait_q);
1118 }
1119
1120 static void
1121 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1122 {
1123         int ret;
1124
1125         ret = ccw_device_cancel_halt_clear(cdev);
1126         switch (ret) {
1127         case 0:
1128                 cdev->private->state = DEV_STATE_OFFLINE;
1129                 wake_up(&cdev->private->wait_q);
1130                 break;
1131         case -ENODEV:
1132                 cdev->private->state = DEV_STATE_NOT_OPER;
1133                 wake_up(&cdev->private->wait_q);
1134                 break;
1135         default:
1136                 ccw_device_set_timeout(cdev, HZ/10);
1137         }
1138 }
1139
1140 /*
1141  * No operation action. This is used e.g. to ignore a timeout event in
1142  * state offline.
1143  */
1144 static void
1145 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1146 {
1147 }
1148
1149 /*
1150  * Bug operation action.
1151  */
1152 static void
1153 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1154 {
1155         printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
1156                cdev->private->state, dev_event);
1157         BUG();
1158 }
1159
1160 /*
1161  * device statemachine
1162  */
1163 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1164         [DEV_STATE_NOT_OPER] = {
1165                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1166                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1167                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1168                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1169         },
1170         [DEV_STATE_SENSE_PGID] = {
1171                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1172                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1173                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1174                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1175         },
1176         [DEV_STATE_SENSE_ID] = {
1177                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1178                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1179                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1180                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1181         },
1182         [DEV_STATE_OFFLINE] = {
1183                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1184                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1185                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1186                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1187         },
1188         [DEV_STATE_VERIFY] = {
1189                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1190                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1191                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1192                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1193         },
1194         [DEV_STATE_ONLINE] = {
1195                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1196                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1197                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1198                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1199         },
1200         [DEV_STATE_W4SENSE] = {
1201                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1202                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1203                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1204                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1205         },
1206         [DEV_STATE_DISBAND_PGID] = {
1207                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1208                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1209                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1210                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1211         },
1212         [DEV_STATE_BOXED] = {
1213                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1214                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1215                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1216                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1217         },
1218         /* states to wait for i/o completion before doing something */
1219         [DEV_STATE_CLEAR_VERIFY] = {
1220                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1221                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1222                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1223                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1224         },
1225         [DEV_STATE_TIMEOUT_KILL] = {
1226                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1227                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1228                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1229                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1230         },
1231         [DEV_STATE_WAIT4IO] = {
1232                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1233                 [DEV_EVENT_INTERRUPT]   = ccw_device_wait4io_irq,
1234                 [DEV_EVENT_TIMEOUT]     = ccw_device_wait4io_timeout,
1235                 [DEV_EVENT_VERIFY]      = ccw_device_wait4io_verify,
1236         },
1237         [DEV_STATE_QUIESCE] = {
1238                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1239                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1240                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1241                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1242         },
1243         /* special states for devices gone not operational */
1244         [DEV_STATE_DISCONNECTED] = {
1245                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1246                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1247                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1248                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1249         },
1250         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1251                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1252                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1253                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1254                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1255         },
1256         [DEV_STATE_CMFCHANGE] = {
1257                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1258                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1259                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1260                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1261         },
1262         [DEV_STATE_CMFUPDATE] = {
1263                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1264                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1265                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1266                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1267         },
1268 };
1269
1270 /*
1271  * io_subchannel_irq is called for "real" interrupts or for status
1272  * pending conditions on msch.
1273  */
1274 void
1275 io_subchannel_irq (struct device *pdev)
1276 {
1277         struct ccw_device *cdev;
1278
1279         cdev = to_subchannel(pdev)->dev.driver_data;
1280
1281         CIO_TRACE_EVENT (3, "IRQ");
1282         CIO_TRACE_EVENT (3, pdev->bus_id);
1283         if (cdev)
1284                 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1285 }
1286
1287 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);