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 void
  63 device_set_waiting(struct subchannel *sch)
  64 {
  65         struct ccw_device *cdev;
  66
  67         if (!sch->dev.driver_data)
  68                 return;
  69         cdev = sch->dev.driver_data;
  70         ccw_device_set_timeout(cdev, 10*HZ);
  71         cdev->private->state = DEV_STATE_WAIT4IO;
  72 }
  73
  74 /*
  75  * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
  76  */
  77 static void
  78 ccw_device_timeout(unsigned long data)
  79 {
  80         struct ccw_device *cdev;
  81
  82         cdev = (struct ccw_device *) data;
  83         spin_lock_irq(cdev->ccwlock);
  84         dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
  85         spin_unlock_irq(cdev->ccwlock);
  86 }
  87
  88 /*
  89  * Set timeout
  90  */
  91 void
  92 ccw_device_set_timeout(struct ccw_device *cdev, int expires)
  93 {
  94         if (expires == 0) {
  95                 del_timer(&cdev->private->timer);
  96                 return;
  97         }
  98         if (timer_pending(&cdev->private->timer)) {
  99                 if (mod_timer(&cdev->private->timer, jiffies + expires))
 100                         return;
 101         }
 102         cdev->private->timer.function = ccw_device_timeout;
 103         cdev->private->timer.data = (unsigned long) cdev;
 104         cdev->private->timer.expires = jiffies + expires;
 105         add_timer(&cdev->private->timer);
 106 }
 107
 108 /* Kill any pending timers after machine check. */
 109 void
 110 device_kill_pending_timer(struct subchannel *sch)
 111 {
 112         struct ccw_device *cdev;
 113
 114         if (!sch->dev.driver_data)
 115                 return;
 116         cdev = sch->dev.driver_data;
 117         ccw_device_set_timeout(cdev, 0);
 118 }
 119
 120 /*
 121  * Cancel running i/o. This is called repeatedly since halt/clear are
 122  * asynchronous operations. We do one try with cio_cancel, two tries
 123  * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
 124  * Returns 0 if device now idle, -ENODEV for device not operational and
 125  * -EBUSY if an interrupt is expected (either from halt/clear or from a
 126  * status pending).
 127  */
 128 int
 129 ccw_device_cancel_halt_clear(struct ccw_device *cdev)
 130 {
 131         struct subchannel *sch;
 132         int ret;
 133
 134         sch = to_subchannel(cdev->dev.parent);
 135         ret = stsch(sch->schid, &sch->schib);
 136         if (ret || !sch->schib.pmcw.dnv)
 137                 return -ENODEV;
 138         if (!sch->schib.pmcw.ena || sch->schib.scsw.actl == 0)
 139                 /* Not operational or no activity -> done. */
 140                 return 0;
 141         /* Stage 1: cancel io. */
 142         if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) &&
 143             !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
 144                 ret = cio_cancel(sch);
 145                 if (ret != -EINVAL)
 146                         return ret;
 147                 /* cancel io unsuccessful. From now on it is asynchronous. */
 148                 cdev->private->iretry = 3;      /* 3 halt retries. */
 149         }
 150         if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
 151                 /* Stage 2: halt io. */
 152                 if (cdev->private->iretry) {
 153                         cdev->private->iretry--;
 154                         ret = cio_halt(sch);
 155                         if (ret != -EBUSY)
 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 static inline int cmp_pgid(struct pgid *p1, struct pgid *p2)
 383 {
 384         char *c1;
 385         char *c2;
 386
 387         c1 = (char *)p1;
 388         c2 = (char *)p2;
 389
 390         return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
 391 }
 392
 393 static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
 394 {
 395         int i;
 396         int last;
 397
 398         last = 0;
 399         for (i = 0; i < 8; i++) {
 400                 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
 401                         /* No PGID yet */
 402                         continue;
 403                 if (cdev->private->pgid[last].inf.ps.state1 ==
 404                     SNID_STATE1_RESET) {
 405                         /* First non-zero PGID */
 406                         last = i;
 407                         continue;
 408                 }
 409                 if (cmp_pgid(&cdev->private->pgid[i],
 410                              &cdev->private->pgid[last]) == 0)
 411                         /* Non-conflicting PGIDs */
 412                         continue;
 413
 414                 /* PGID mismatch, can't pathgroup. */
 415                 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
 416                               "0.%x.%04x, can't pathgroup\n",
 417                               cdev->private->ssid, cdev->private->devno);
 418                 cdev->private->options.pgroup = 0;
 419                 return;
 420         }
 421         if (cdev->private->pgid[last].inf.ps.state1 ==
 422             SNID_STATE1_RESET)
 423                 /* No previous pgid found */
 424                 memcpy(&cdev->private->pgid[0], &css[0]->global_pgid,
 425                        sizeof(struct pgid));
 426         else
 427                 /* Use existing pgid */
 428                 memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
 429                        sizeof(struct pgid));
 430 }
 431
 432 /*
 433  * Function called from device_pgid.c after sense path ground has completed.
 434  */
 435 void
 436 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
 437 {
 438         struct subchannel *sch;
 439
 440         sch = to_subchannel(cdev->dev.parent);
 441         switch (err) {
 442         case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
 443                 cdev->private->options.pgroup = 0;
 444                 break;
 445         case 0: /* success */
 446         case -EACCES: /* partial success, some paths not operational */
 447                 /* Check if all pgids are equal or 0. */
 448                 __ccw_device_get_common_pgid(cdev);
 449                 break;
 450         case -ETIME:            /* Sense path group id stopped by timeout. */
 451         case -EUSERS:           /* device is reserved for someone else. */
 452                 ccw_device_done(cdev, DEV_STATE_BOXED);
 453                 return;
 454         default:
 455                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 456                 return;
 457         }
 458         /* Start Path Group verification. */
 459         sch->vpm = 0;   /* Start with no path groups set. */
 460         cdev->private->state = DEV_STATE_VERIFY;
 461         ccw_device_verify_start(cdev);
 462 }
 463
 464 /*
 465  * Start device recognition.
 466  */
 467 int
 468 ccw_device_recognition(struct ccw_device *cdev)
 469 {
 470         struct subchannel *sch;
 471         int ret;
 472
 473         if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
 474             (cdev->private->state != DEV_STATE_BOXED))
 475                 return -EINVAL;
 476         sch = to_subchannel(cdev->dev.parent);
 477         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 478         if (ret != 0)
 479                 /* Couldn't enable the subchannel for i/o. Sick device. */
 480                 return ret;
 481
 482         /* After 60s the device recognition is considered to have failed. */
 483         ccw_device_set_timeout(cdev, 60*HZ);
 484
 485         /*
 486          * We used to start here with a sense pgid to find out whether a device
 487          * is locked by someone else. Unfortunately, the sense pgid command
 488          * code has other meanings on devices predating the path grouping
 489          * algorithm, so we start with sense id and box the device after an
 490          * timeout (or if sense pgid during path verification detects the device
 491          * is locked, as may happen on newer devices).
 492          */
 493         cdev->private->flags.recog_done = 0;
 494         cdev->private->state = DEV_STATE_SENSE_ID;
 495         ccw_device_sense_id_start(cdev);
 496         return 0;
 497 }
 498
 499 /*
 500  * Handle timeout in device recognition.
 501  */
 502 static void
 503 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 504 {
 505         int ret;
 506
 507         ret = ccw_device_cancel_halt_clear(cdev);
 508         switch (ret) {
 509         case 0:
 510                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 511                 break;
 512         case -ENODEV:
 513                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 514                 break;
 515         default:
 516                 ccw_device_set_timeout(cdev, 3*HZ);
 517         }
 518 }
 519
 520
 521 static void
 522 ccw_device_nopath_notify(void *data)
 523 {
 524         struct ccw_device *cdev;
 525         struct subchannel *sch;
 526         int ret;
 527
 528         cdev = (struct ccw_device *)data;
 529         sch = to_subchannel(cdev->dev.parent);
 530         /* Extra sanity. */
 531         if (sch->lpm)
 532                 return;
 533         ret = (sch->driver && sch->driver->notify) ?
 534                 sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0;
 535         if (!ret) {
 536                 if (get_device(&sch->dev)) {
 537                         /* Driver doesn't want to keep device. */
 538                         cio_disable_subchannel(sch);
 539                         if (get_device(&cdev->dev)) {
 540                                 PREPARE_WORK(&cdev->private->kick_work,
 541                                              ccw_device_call_sch_unregister,
 542                                              (void *)cdev);
 543                                 queue_work(ccw_device_work,
 544                                            &cdev->private->kick_work);
 545                         } else
 546                                 put_device(&sch->dev);
 547                 }
 548         } else {
 549                 cio_disable_subchannel(sch);
 550                 ccw_device_set_timeout(cdev, 0);
 551                 cdev->private->flags.fake_irb = 0;
 552                 cdev->private->state = DEV_STATE_DISCONNECTED;
 553                 wake_up(&cdev->private->wait_q);
 554         }
 555 }
 556
 557 void
 558 ccw_device_verify_done(struct ccw_device *cdev, int err)
 559 {
 560         cdev->private->flags.doverify = 0;
 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 = (struct scsw) {
 570                                 .cc = 1,
 571                                 .fctl = SCSW_FCTL_START_FUNC,
 572                                 .actl = SCSW_ACTL_START_PEND,
 573                                 .stctl = SCSW_STCTL_STATUS_PEND,
 574                         };
 575                         cdev->private->flags.fake_irb = 0;
 576                         if (cdev->handler)
 577                                 cdev->handler(cdev, cdev->private->intparm,
 578                                               &cdev->private->irb);
 579                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 580                 }
 581                 break;
 582         case -ETIME:
 583                 ccw_device_done(cdev, DEV_STATE_BOXED);
 584                 break;
 585         default:
 586                 PREPARE_WORK(&cdev->private->kick_work,
 587                              ccw_device_nopath_notify, (void *)cdev);
 588                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 589                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 590                 break;
 591         }
 592 }
 593
 594 /*
 595  * Get device online.
 596  */
 597 int
 598 ccw_device_online(struct ccw_device *cdev)
 599 {
 600         struct subchannel *sch;
 601         int ret;
 602
 603         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 604             (cdev->private->state != DEV_STATE_BOXED))
 605                 return -EINVAL;
 606         sch = to_subchannel(cdev->dev.parent);
 607         if (css_init_done && !get_device(&cdev->dev))
 608                 return -ENODEV;
 609         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 610         if (ret != 0) {
 611                 /* Couldn't enable the subchannel for i/o. Sick device. */
 612                 if (ret == -ENODEV)
 613                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 614                 return ret;
 615         }
 616         /* Do we want to do path grouping? */
 617         if (!cdev->private->options.pgroup) {
 618                 /* Start initial path verification. */
 619                 cdev->private->state = DEV_STATE_VERIFY;
 620                 ccw_device_verify_start(cdev);
 621                 return 0;
 622         }
 623         /* Do a SensePGID first. */
 624         cdev->private->state = DEV_STATE_SENSE_PGID;
 625         ccw_device_sense_pgid_start(cdev);
 626         return 0;
 627 }
 628
 629 void
 630 ccw_device_disband_done(struct ccw_device *cdev, int err)
 631 {
 632         switch (err) {
 633         case 0:
 634                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 635                 break;
 636         case -ETIME:
 637                 ccw_device_done(cdev, DEV_STATE_BOXED);
 638                 break;
 639         default:
 640                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 641                 break;
 642         }
 643 }
 644
 645 /*
 646  * Shutdown device.
 647  */
 648 int
 649 ccw_device_offline(struct ccw_device *cdev)
 650 {
 651         struct subchannel *sch;
 652
 653         sch = to_subchannel(cdev->dev.parent);
 654         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
 655                 return -ENODEV;
 656         if (cdev->private->state != DEV_STATE_ONLINE) {
 657                 if (sch->schib.scsw.actl != 0)
 658                         return -EBUSY;
 659                 return -EINVAL;
 660         }
 661         if (sch->schib.scsw.actl != 0)
 662                 return -EBUSY;
 663         /* Are we doing path grouping? */
 664         if (!cdev->private->options.pgroup) {
 665                 /* No, set state offline immediately. */
 666                 sch->vpm = 0;
 667                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 668                 return 0;
 669         }
 670         /* Start Set Path Group commands. */
 671         cdev->private->state = DEV_STATE_DISBAND_PGID;
 672         ccw_device_disband_start(cdev);
 673         return 0;
 674 }
 675
 676 /*
 677  * Handle timeout in device online/offline process.
 678  */
 679 static void
 680 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 681 {
 682         int ret;
 683
 684         ret = ccw_device_cancel_halt_clear(cdev);
 685         switch (ret) {
 686         case 0:
 687                 ccw_device_done(cdev, DEV_STATE_BOXED);
 688                 break;
 689         case -ENODEV:
 690                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 691                 break;
 692         default:
 693                 ccw_device_set_timeout(cdev, 3*HZ);
 694         }
 695 }
 696
 697 /*
 698  * Handle not oper event in device recognition.
 699  */
 700 static void
 701 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 702 {
 703         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 704 }
 705
 706 /*
 707  * Handle not operational event while offline.
 708  */
 709 static void
 710 ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 711 {
 712         struct subchannel *sch;
 713
 714         cdev->private->state = DEV_STATE_NOT_OPER;
 715         sch = to_subchannel(cdev->dev.parent);
 716         if (get_device(&cdev->dev)) {
 717                 PREPARE_WORK(&cdev->private->kick_work,
 718                              ccw_device_call_sch_unregister, (void *)cdev);
 719                 queue_work(ccw_device_work, &cdev->private->kick_work);
 720         }
 721         wake_up(&cdev->private->wait_q);
 722 }
 723
 724 /*
 725  * Handle not operational event while online.
 726  */
 727 static void
 728 ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 729 {
 730         struct subchannel *sch;
 731
 732         sch = to_subchannel(cdev->dev.parent);
 733         if (sch->driver->notify &&
 734             sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) {
 735                         ccw_device_set_timeout(cdev, 0);
 736                         cdev->private->flags.fake_irb = 0;
 737                         cdev->private->state = DEV_STATE_DISCONNECTED;
 738                         wake_up(&cdev->private->wait_q);
 739                         return;
 740         }
 741         cdev->private->state = DEV_STATE_NOT_OPER;
 742         cio_disable_subchannel(sch);
 743         if (sch->schib.scsw.actl != 0) {
 744                 // FIXME: not-oper indication to device driver ?
 745                 ccw_device_call_handler(cdev);
 746         }
 747         if (get_device(&cdev->dev)) {
 748                 PREPARE_WORK(&cdev->private->kick_work,
 749                              ccw_device_call_sch_unregister, (void *)cdev);
 750                 queue_work(ccw_device_work, &cdev->private->kick_work);
 751         }
 752         wake_up(&cdev->private->wait_q);
 753 }
 754
 755 /*
 756  * Handle path verification event.
 757  */
 758 static void
 759 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 760 {
 761         struct subchannel *sch;
 762
 763         if (cdev->private->state == DEV_STATE_W4SENSE) {
 764                 cdev->private->flags.doverify = 1;
 765                 return;
 766         }
 767         sch = to_subchannel(cdev->dev.parent);
 768         /*
 769          * Since we might not just be coming from an interrupt from the
 770          * subchannel we have to update the schib.
 771          */
 772         stsch(sch->schid, &sch->schib);
 773
 774         if (sch->schib.scsw.actl != 0 ||
 775             (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
 776                 /*
 777                  * No final status yet or final status not yet delivered
 778                  * to the device driver. Can't do path verfication now,
 779                  * delay until final status was delivered.
 780                  */
 781                 cdev->private->flags.doverify = 1;
 782                 return;
 783         }
 784         /* Device is idle, we can do the path verification. */
 785         cdev->private->state = DEV_STATE_VERIFY;
 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, (void *)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("Huh? %s(%s): unsolicited interrupt...\n",
 879                                __FUNCTION__, cdev->dev.bus_id);
 880                         if (cdev->handler)
 881                                 cdev->handler (cdev, 0, irb);
 882                 }
 883                 return;
 884         }
 885         /*
 886          * Check if a halt or clear has been issued in the meanwhile. If yes,
 887          * only deliver the halt/clear interrupt to the device driver as if it
 888          * had killed the original request.
 889          */
 890         if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
 891                 cdev->private->flags.dosense = 0;
 892                 memset(&cdev->private->irb, 0, sizeof(struct irb));
 893                 ccw_device_accumulate_irb(cdev, irb);
 894                 goto call_handler;
 895         }
 896         /* Add basic sense info to irb. */
 897         ccw_device_accumulate_basic_sense(cdev, irb);
 898         if (cdev->private->flags.dosense) {
 899                 /* Another basic sense is needed. */
 900                 ccw_device_do_sense(cdev, irb);
 901                 return;
 902         }
 903 call_handler:
 904         cdev->private->state = DEV_STATE_ONLINE;
 905         /* Call the handler. */
 906         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 907                 /* Start delayed path verification. */
 908                 ccw_device_online_verify(cdev, 0);
 909 }
 910
 911 static void
 912 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 913 {
 914         struct irb *irb;
 915
 916         irb = (struct irb *) __LC_IRB;
 917         /* Accumulate status. We don't do basic sense. */
 918         ccw_device_accumulate_irb(cdev, irb);
 919         /* Remember to clear irb to avoid residuals. */
 920         memset(&cdev->private->irb, 0, sizeof(struct irb));
 921         /* Try to start delayed device verification. */
 922         ccw_device_online_verify(cdev, 0);
 923         /* Note: Don't call handler for cio initiated clear! */
 924 }
 925
 926 static void
 927 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
 928 {
 929         struct subchannel *sch;
 930
 931         sch = to_subchannel(cdev->dev.parent);
 932         ccw_device_set_timeout(cdev, 0);
 933         /* OK, i/o is dead now. Call interrupt handler. */
 934         cdev->private->state = DEV_STATE_ONLINE;
 935         if (cdev->handler)
 936                 cdev->handler(cdev, cdev->private->intparm,
 937                               ERR_PTR(-ETIMEDOUT));
 938         if (!sch->lpm) {
 939                 PREPARE_WORK(&cdev->private->kick_work,
 940                              ccw_device_nopath_notify, (void *)cdev);
 941                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 942         } else if (cdev->private->flags.doverify)
 943                 /* Start delayed path verification. */
 944                 ccw_device_online_verify(cdev, 0);
 945 }
 946
 947 static void
 948 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 949 {
 950         int ret;
 951
 952         ret = ccw_device_cancel_halt_clear(cdev);
 953         if (ret == -EBUSY) {
 954                 ccw_device_set_timeout(cdev, 3*HZ);
 955                 return;
 956         }
 957         if (ret == -ENODEV) {
 958                 struct subchannel *sch;
 959
 960                 sch = to_subchannel(cdev->dev.parent);
 961                 if (!sch->lpm) {
 962                         PREPARE_WORK(&cdev->private->kick_work,
 963                                      ccw_device_nopath_notify, (void *)cdev);
 964                         queue_work(ccw_device_notify_work,
 965                                    &cdev->private->kick_work);
 966                 } else
 967                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 968                 return;
 969         }
 970         //FIXME: Can we get here?
 971         cdev->private->state = DEV_STATE_ONLINE;
 972         if (cdev->handler)
 973                 cdev->handler(cdev, cdev->private->intparm,
 974                               ERR_PTR(-ETIMEDOUT));
 975 }
 976
 977 static void
 978 ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event)
 979 {
 980         struct irb *irb;
 981         struct subchannel *sch;
 982
 983         irb = (struct irb *) __LC_IRB;
 984         /*
 985          * Accumulate status and find out if a basic sense is needed.
 986          * This is fine since we have already adapted the lpm.
 987          */
 988         ccw_device_accumulate_irb(cdev, irb);
 989         if (cdev->private->flags.dosense) {
 990                 if (ccw_device_do_sense(cdev, irb) == 0) {
 991                         cdev->private->state = DEV_STATE_W4SENSE;
 992                 }
 993                 return;
 994         }
 995
 996         /* Iff device is idle, reset timeout. */
 997         sch = to_subchannel(cdev->dev.parent);
 998         if (!stsch(sch->schid, &sch->schib))
 999                 if (sch->schib.scsw.actl == 0)
1000                         ccw_device_set_timeout(cdev, 0);
1001         /* Call the handler. */
1002         ccw_device_call_handler(cdev);
1003         if (!sch->lpm) {
1004                 PREPARE_WORK(&cdev->private->kick_work,
1005                              ccw_device_nopath_notify, (void *)cdev);
1006                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
1007         } else if (cdev->private->flags.doverify)
1008                 ccw_device_online_verify(cdev, 0);
1009 }
1010
1011 static void
1012 ccw_device_wait4io_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1013 {
1014         int ret;
1015         struct subchannel *sch;
1016
1017         sch = to_subchannel(cdev->dev.parent);
1018         ccw_device_set_timeout(cdev, 0);
1019         ret = ccw_device_cancel_halt_clear(cdev);
1020         if (ret == -EBUSY) {
1021                 ccw_device_set_timeout(cdev, 3*HZ);
1022                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
1023                 return;
1024         }
1025         if (ret == -ENODEV) {
1026                 if (!sch->lpm) {
1027                         PREPARE_WORK(&cdev->private->kick_work,
1028                                      ccw_device_nopath_notify, (void *)cdev);
1029                         queue_work(ccw_device_notify_work,
1030                                    &cdev->private->kick_work);
1031                 } else
1032                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1033                 return;
1034         }
1035         if (cdev->handler)
1036                 cdev->handler(cdev, cdev->private->intparm,
1037                               ERR_PTR(-ETIMEDOUT));
1038         if (!sch->lpm) {
1039                 PREPARE_WORK(&cdev->private->kick_work,
1040                              ccw_device_nopath_notify, (void *)cdev);
1041                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
1042         } else if (cdev->private->flags.doverify)
1043                 /* Start delayed path verification. */
1044                 ccw_device_online_verify(cdev, 0);
1045 }
1046
1047 static void
1048 ccw_device_wait4io_verify(struct ccw_device *cdev, enum dev_event dev_event)
1049 {
1050         /* When the I/O has terminated, we have to start verification. */
1051         cdev->private->flags.doverify = 1;
1052 }
1053
1054 static void
1055 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1056 {
1057         struct irb *irb;
1058
1059         switch (dev_event) {
1060         case DEV_EVENT_INTERRUPT:
1061                 irb = (struct irb *) __LC_IRB;
1062                 /* Check for unsolicited interrupt. */
1063                 if ((irb->scsw.stctl ==
1064                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1065                     (!irb->scsw.cc))
1066                         /* FIXME: we should restart stlck here, but this
1067                          * is extremely unlikely ... */
1068                         goto out_wakeup;
1069
1070                 ccw_device_accumulate_irb(cdev, irb);
1071                 /* We don't care about basic sense etc. */
1072                 break;
1073         default: /* timeout */
1074                 break;
1075         }
1076 out_wakeup:
1077         wake_up(&cdev->private->wait_q);
1078 }
1079
1080 static void
1081 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1082 {
1083         struct subchannel *sch;
1084
1085         sch = to_subchannel(cdev->dev.parent);
1086         if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1087                 /* Couldn't enable the subchannel for i/o. Sick device. */
1088                 return;
1089
1090         /* After 60s the device recognition is considered to have failed. */
1091         ccw_device_set_timeout(cdev, 60*HZ);
1092
1093         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1094         ccw_device_sense_id_start(cdev);
1095 }
1096
1097 void
1098 device_trigger_reprobe(struct subchannel *sch)
1099 {
1100         struct ccw_device *cdev;
1101
1102         if (!sch->dev.driver_data)
1103                 return;
1104         cdev = sch->dev.driver_data;
1105         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1106                 return;
1107
1108         /* Update some values. */
1109         if (stsch(sch->schid, &sch->schib))
1110                 return;
1111
1112         /*
1113          * The pim, pam, pom values may not be accurate, but they are the best
1114          * we have before performing device selection :/
1115          */
1116         sch->lpm = sch->schib.pmcw.pim &
1117                 sch->schib.pmcw.pam &
1118                 sch->schib.pmcw.pom &
1119                 sch->opm;
1120         /* Re-set some bits in the pmcw that were lost. */
1121         sch->schib.pmcw.isc = 3;
1122         sch->schib.pmcw.csense = 1;
1123         sch->schib.pmcw.ena = 0;
1124         if ((sch->lpm & (sch->lpm - 1)) != 0)
1125                 sch->schib.pmcw.mp = 1;
1126         sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1127         /* We should also udate ssd info, but this has to wait. */
1128         ccw_device_start_id(cdev, 0);
1129 }
1130
1131 static void
1132 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1133 {
1134         struct subchannel *sch;
1135
1136         sch = to_subchannel(cdev->dev.parent);
1137         /*
1138          * An interrupt in state offline means a previous disable was not
1139          * successful. Try again.
1140          */
1141         cio_disable_subchannel(sch);
1142 }
1143
1144 static void
1145 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1146 {
1147         retry_set_schib(cdev);
1148         cdev->private->state = DEV_STATE_ONLINE;
1149         dev_fsm_event(cdev, dev_event);
1150 }
1151
1152 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1153                                        enum dev_event dev_event)
1154 {
1155         cmf_retry_copy_block(cdev);
1156         cdev->private->state = DEV_STATE_ONLINE;
1157         dev_fsm_event(cdev, dev_event);
1158 }
1159
1160 static void
1161 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1162 {
1163         ccw_device_set_timeout(cdev, 0);
1164         if (dev_event == DEV_EVENT_NOTOPER)
1165                 cdev->private->state = DEV_STATE_NOT_OPER;
1166         else
1167                 cdev->private->state = DEV_STATE_OFFLINE;
1168         wake_up(&cdev->private->wait_q);
1169 }
1170
1171 static void
1172 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1173 {
1174         int ret;
1175
1176         ret = ccw_device_cancel_halt_clear(cdev);
1177         switch (ret) {
1178         case 0:
1179                 cdev->private->state = DEV_STATE_OFFLINE;
1180                 wake_up(&cdev->private->wait_q);
1181                 break;
1182         case -ENODEV:
1183                 cdev->private->state = DEV_STATE_NOT_OPER;
1184                 wake_up(&cdev->private->wait_q);
1185                 break;
1186         default:
1187                 ccw_device_set_timeout(cdev, HZ/10);
1188         }
1189 }
1190
1191 /*
1192  * No operation action. This is used e.g. to ignore a timeout event in
1193  * state offline.
1194  */
1195 static void
1196 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1197 {
1198 }
1199
1200 /*
1201  * Bug operation action.
1202  */
1203 static void
1204 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1205 {
1206         printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
1207                cdev->private->state, dev_event);
1208         BUG();
1209 }
1210
1211 /*
1212  * device statemachine
1213  */
1214 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1215         [DEV_STATE_NOT_OPER] = {
1216                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1217                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1218                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1219                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1220         },
1221         [DEV_STATE_SENSE_PGID] = {
1222                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1223                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1224                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1225                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1226         },
1227         [DEV_STATE_SENSE_ID] = {
1228                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1229                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1230                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1231                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1232         },
1233         [DEV_STATE_OFFLINE] = {
1234                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1235                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1236                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1237                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1238         },
1239         [DEV_STATE_VERIFY] = {
1240                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1241                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1242                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1243                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1244         },
1245         [DEV_STATE_ONLINE] = {
1246                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1247                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1248                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1249                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1250         },
1251         [DEV_STATE_W4SENSE] = {
1252                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1253                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1254                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1255                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1256         },
1257         [DEV_STATE_DISBAND_PGID] = {
1258                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1259                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1260                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1261                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1262         },
1263         [DEV_STATE_BOXED] = {
1264                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1265                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1266                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1267                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1268         },
1269         /* states to wait for i/o completion before doing something */
1270         [DEV_STATE_CLEAR_VERIFY] = {
1271                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1272                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1273                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1274                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1275         },
1276         [DEV_STATE_TIMEOUT_KILL] = {
1277                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1278                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1279                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1280                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1281         },
1282         [DEV_STATE_WAIT4IO] = {
1283                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1284                 [DEV_EVENT_INTERRUPT]   = ccw_device_wait4io_irq,
1285                 [DEV_EVENT_TIMEOUT]     = ccw_device_wait4io_timeout,
1286                 [DEV_EVENT_VERIFY]      = ccw_device_wait4io_verify,
1287         },
1288         [DEV_STATE_QUIESCE] = {
1289                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1290                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1291                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1292                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1293         },
1294         /* special states for devices gone not operational */
1295         [DEV_STATE_DISCONNECTED] = {
1296                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1297                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1298                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1299                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1300         },
1301         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1302                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1303                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1304                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1305                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1306         },
1307         [DEV_STATE_CMFCHANGE] = {
1308                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1309                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1310                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1311                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1312         },
1313         [DEV_STATE_CMFUPDATE] = {
1314                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1315                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1316                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1317                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1318         },
1319 };
1320
1321 /*
1322  * io_subchannel_irq is called for "real" interrupts or for status
1323  * pending conditions on msch.
1324  */
1325 void
1326 io_subchannel_irq (struct device *pdev)
1327 {
1328         struct ccw_device *cdev;
1329
1330         cdev = to_subchannel(pdev)->dev.driver_data;
1331
1332         CIO_TRACE_EVENT (3, "IRQ");
1333         CIO_TRACE_EVENT (3, pdev->bus_id);
1334         if (cdev)
1335                 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1336 }
1337
1338 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);