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 #include <asm/chpid.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 #include "chp.h"
  27
  28 static int timeout_log_enabled;
  29
  30 int
  31 device_is_online(struct subchannel *sch)
  32 {
  33         struct ccw_device *cdev;
  34
  35         if (!sch->dev.driver_data)
  36                 return 0;
  37         cdev = sch->dev.driver_data;
  38         return (cdev->private->state == DEV_STATE_ONLINE);
  39 }
  40
  41 int
  42 device_is_disconnected(struct subchannel *sch)
  43 {
  44         struct ccw_device *cdev;
  45
  46         if (!sch->dev.driver_data)
  47                 return 0;
  48         cdev = sch->dev.driver_data;
  49         return (cdev->private->state == DEV_STATE_DISCONNECTED ||
  50                 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
  51 }
  52
  53 void
  54 device_set_disconnected(struct subchannel *sch)
  55 {
  56         struct ccw_device *cdev;
  57
  58         if (!sch->dev.driver_data)
  59                 return;
  60         cdev = sch->dev.driver_data;
  61         ccw_device_set_timeout(cdev, 0);
  62         cdev->private->flags.fake_irb = 0;
  63         cdev->private->state = DEV_STATE_DISCONNECTED;
  64 }
  65
  66 void device_set_intretry(struct subchannel *sch)
  67 {
  68         struct ccw_device *cdev;
  69
  70         cdev = sch->dev.driver_data;
  71         if (!cdev)
  72                 return;
  73         cdev->private->flags.intretry = 1;
  74 }
  75
  76 int device_trigger_verify(struct subchannel *sch)
  77 {
  78         struct ccw_device *cdev;
  79
  80         cdev = sch->dev.driver_data;
  81         if (!cdev || !cdev->online)
  82                 return -EINVAL;
  83         dev_fsm_event(cdev, DEV_EVENT_VERIFY);
  84         return 0;
  85 }
  86
  87 static int __init ccw_timeout_log_setup(char *unused)
  88 {
  89         timeout_log_enabled = 1;
  90         return 1;
  91 }
  92
  93 __setup("ccw_timeout_log", ccw_timeout_log_setup);
  94
  95 static void ccw_timeout_log(struct ccw_device *cdev)
  96 {
  97         struct schib schib;
  98         struct subchannel *sch;
  99         int cc;
 100
 101         sch = to_subchannel(cdev->dev.parent);
 102         cc = stsch(sch->schid, &schib);
 103
 104         printk(KERN_WARNING "cio: ccw device timeout occurred at %llx, "
 105                "device information:\n", get_clock());
 106         printk(KERN_WARNING "cio: orb:\n");
 107         print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
 108                        &sch->orb, sizeof(sch->orb), 0);
 109         printk(KERN_WARNING "cio: ccw device bus id: %s\n", cdev->dev.bus_id);
 110         printk(KERN_WARNING "cio: subchannel bus id: %s\n", sch->dev.bus_id);
 111         printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, "
 112                "vpm: %02x\n", sch->lpm, sch->opm, sch->vpm);
 113
 114         if ((void *)(addr_t)sch->orb.cpa == &sch->sense_ccw ||
 115             (void *)(addr_t)sch->orb.cpa == cdev->private->iccws)
 116                 printk(KERN_WARNING "cio: last channel program (intern):\n");
 117         else
 118                 printk(KERN_WARNING "cio: last channel program:\n");
 119
 120         print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
 121                        (void *)(addr_t)sch->orb.cpa, sizeof(struct ccw1), 0);
 122         printk(KERN_WARNING "cio: ccw device state: %d\n",
 123                cdev->private->state);
 124         printk(KERN_WARNING "cio: store subchannel returned: cc=%d\n", cc);
 125         printk(KERN_WARNING "cio: schib:\n");
 126         print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
 127                        &schib, sizeof(schib), 0);
 128         printk(KERN_WARNING "cio: ccw device flags:\n");
 129         print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
 130                        &cdev->private->flags, sizeof(cdev->private->flags), 0);
 131 }
 132
 133 /*
 134  * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
 135  */
 136 static void
 137 ccw_device_timeout(unsigned long data)
 138 {
 139         struct ccw_device *cdev;
 140
 141         cdev = (struct ccw_device *) data;
 142         spin_lock_irq(cdev->ccwlock);
 143         if (timeout_log_enabled)
 144                 ccw_timeout_log(cdev);
 145         dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
 146         spin_unlock_irq(cdev->ccwlock);
 147 }
 148
 149 /*
 150  * Set timeout
 151  */
 152 void
 153 ccw_device_set_timeout(struct ccw_device *cdev, int expires)
 154 {
 155         if (expires == 0) {
 156                 del_timer(&cdev->private->timer);
 157                 return;
 158         }
 159         if (timer_pending(&cdev->private->timer)) {
 160                 if (mod_timer(&cdev->private->timer, jiffies + expires))
 161                         return;
 162         }
 163         cdev->private->timer.function = ccw_device_timeout;
 164         cdev->private->timer.data = (unsigned long) cdev;
 165         cdev->private->timer.expires = jiffies + expires;
 166         add_timer(&cdev->private->timer);
 167 }
 168
 169 /* Kill any pending timers after machine check. */
 170 void
 171 device_kill_pending_timer(struct subchannel *sch)
 172 {
 173         struct ccw_device *cdev;
 174
 175         if (!sch->dev.driver_data)
 176                 return;
 177         cdev = sch->dev.driver_data;
 178         ccw_device_set_timeout(cdev, 0);
 179 }
 180
 181 /*
 182  * Cancel running i/o. This is called repeatedly since halt/clear are
 183  * asynchronous operations. We do one try with cio_cancel, two tries
 184  * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
 185  * Returns 0 if device now idle, -ENODEV for device not operational and
 186  * -EBUSY if an interrupt is expected (either from halt/clear or from a
 187  * status pending).
 188  */
 189 int
 190 ccw_device_cancel_halt_clear(struct ccw_device *cdev)
 191 {
 192         struct subchannel *sch;
 193         int ret;
 194
 195         sch = to_subchannel(cdev->dev.parent);
 196         ret = stsch(sch->schid, &sch->schib);
 197         if (ret || !sch->schib.pmcw.dnv)
 198                 return -ENODEV;
 199         if (!sch->schib.pmcw.ena)
 200                 /* Not operational -> done. */
 201                 return 0;
 202         /* Stage 1: cancel io. */
 203         if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) &&
 204             !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
 205                 ret = cio_cancel(sch);
 206                 if (ret != -EINVAL)
 207                         return ret;
 208                 /* cancel io unsuccessful. From now on it is asynchronous. */
 209                 cdev->private->iretry = 3;      /* 3 halt retries. */
 210         }
 211         if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
 212                 /* Stage 2: halt io. */
 213                 if (cdev->private->iretry) {
 214                         cdev->private->iretry--;
 215                         ret = cio_halt(sch);
 216                         if (ret != -EBUSY)
 217                                 return (ret == 0) ? -EBUSY : ret;
 218                 }
 219                 /* halt io unsuccessful. */
 220                 cdev->private->iretry = 255;    /* 255 clear retries. */
 221         }
 222         /* Stage 3: clear io. */
 223         if (cdev->private->iretry) {
 224                 cdev->private->iretry--;
 225                 ret = cio_clear (sch);
 226                 return (ret == 0) ? -EBUSY : ret;
 227         }
 228         panic("Can't stop i/o on subchannel.\n");
 229 }
 230
 231 static int
 232 ccw_device_handle_oper(struct ccw_device *cdev)
 233 {
 234         struct subchannel *sch;
 235
 236         sch = to_subchannel(cdev->dev.parent);
 237         cdev->private->flags.recog_done = 1;
 238         /*
 239          * Check if cu type and device type still match. If
 240          * not, it is certainly another device and we have to
 241          * de- and re-register.
 242          */
 243         if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
 244             cdev->id.cu_model != cdev->private->senseid.cu_model ||
 245             cdev->id.dev_type != cdev->private->senseid.dev_type ||
 246             cdev->id.dev_model != cdev->private->senseid.dev_model) {
 247                 PREPARE_WORK(&cdev->private->kick_work,
 248                              ccw_device_do_unreg_rereg);
 249                 queue_work(ccw_device_work, &cdev->private->kick_work);
 250                 return 0;
 251         }
 252         cdev->private->flags.donotify = 1;
 253         return 1;
 254 }
 255
 256 /*
 257  * The machine won't give us any notification by machine check if a chpid has
 258  * been varied online on the SE so we have to find out by magic (i. e. driving
 259  * the channel subsystem to device selection and updating our path masks).
 260  */
 261 static void
 262 __recover_lost_chpids(struct subchannel *sch, int old_lpm)
 263 {
 264         int mask, i;
 265         struct chp_id chpid;
 266
 267         chp_id_init(&chpid);
 268         for (i = 0; i<8; i++) {
 269                 mask = 0x80 >> i;
 270                 if (!(sch->lpm & mask))
 271                         continue;
 272                 if (old_lpm & mask)
 273                         continue;
 274                 chpid.id = sch->schib.pmcw.chpid[i];
 275                 if (!chp_is_registered(chpid))
 276                         css_schedule_eval_all();
 277         }
 278 }
 279
 280 /*
 281  * Stop device recognition.
 282  */
 283 static void
 284 ccw_device_recog_done(struct ccw_device *cdev, int state)
 285 {
 286         struct subchannel *sch;
 287         int notify, old_lpm, same_dev;
 288
 289         sch = to_subchannel(cdev->dev.parent);
 290
 291         ccw_device_set_timeout(cdev, 0);
 292         cio_disable_subchannel(sch);
 293         /*
 294          * Now that we tried recognition, we have performed device selection
 295          * through ssch() and the path information is up to date.
 296          */
 297         old_lpm = sch->lpm;
 298         stsch(sch->schid, &sch->schib);
 299         sch->lpm = sch->schib.pmcw.pam & sch->opm;
 300         /* Check since device may again have become not operational. */
 301         if (!sch->schib.pmcw.dnv)
 302                 state = DEV_STATE_NOT_OPER;
 303         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
 304                 /* Force reprobe on all chpids. */
 305                 old_lpm = 0;
 306         if (sch->lpm != old_lpm)
 307                 __recover_lost_chpids(sch, old_lpm);
 308         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 309                 if (state == DEV_STATE_NOT_OPER) {
 310                         cdev->private->flags.recog_done = 1;
 311                         cdev->private->state = DEV_STATE_DISCONNECTED;
 312                         return;
 313                 }
 314                 /* Boxed devices don't need extra treatment. */
 315         }
 316         notify = 0;
 317         same_dev = 0; /* Keep the compiler quiet... */
 318         switch (state) {
 319         case DEV_STATE_NOT_OPER:
 320                 CIO_DEBUG(KERN_WARNING, 2,
 321                           "cio: SenseID : unknown device %04x on subchannel "
 322                           "0.%x.%04x\n", cdev->private->dev_id.devno,
 323                           sch->schid.ssid, sch->schid.sch_no);
 324                 break;
 325         case DEV_STATE_OFFLINE:
 326                 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 327                         same_dev = ccw_device_handle_oper(cdev);
 328                         notify = 1;
 329                 }
 330                 /* fill out sense information */
 331                 memset(&cdev->id, 0, sizeof(cdev->id));
 332                 cdev->id.cu_type   = cdev->private->senseid.cu_type;
 333                 cdev->id.cu_model  = cdev->private->senseid.cu_model;
 334                 cdev->id.dev_type  = cdev->private->senseid.dev_type;
 335                 cdev->id.dev_model = cdev->private->senseid.dev_model;
 336                 if (notify) {
 337                         cdev->private->state = DEV_STATE_OFFLINE;
 338                         if (same_dev) {
 339                                 /* Get device online again. */
 340                                 ccw_device_online(cdev);
 341                                 wake_up(&cdev->private->wait_q);
 342                         }
 343                         return;
 344                 }
 345                 /* Issue device info message. */
 346                 CIO_DEBUG(KERN_INFO, 2,
 347                           "cio: SenseID : device 0.%x.%04x reports: "
 348                           "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
 349                           "%04X/%02X\n",
 350                           cdev->private->dev_id.ssid,
 351                           cdev->private->dev_id.devno,
 352                           cdev->id.cu_type, cdev->id.cu_model,
 353                           cdev->id.dev_type, cdev->id.dev_model);
 354                 break;
 355         case DEV_STATE_BOXED:
 356                 CIO_DEBUG(KERN_WARNING, 2,
 357                           "cio: SenseID : boxed device %04x on subchannel "
 358                           "0.%x.%04x\n", cdev->private->dev_id.devno,
 359                           sch->schid.ssid, sch->schid.sch_no);
 360                 break;
 361         }
 362         cdev->private->state = state;
 363         io_subchannel_recog_done(cdev);
 364         if (state != DEV_STATE_NOT_OPER)
 365                 wake_up(&cdev->private->wait_q);
 366 }
 367
 368 /*
 369  * Function called from device_id.c after sense id has completed.
 370  */
 371 void
 372 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
 373 {
 374         switch (err) {
 375         case 0:
 376                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
 377                 break;
 378         case -ETIME:            /* Sense id stopped by timeout. */
 379                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 380                 break;
 381         default:
 382                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 383                 break;
 384         }
 385 }
 386
 387 static void
 388 ccw_device_oper_notify(struct work_struct *work)
 389 {
 390         struct ccw_device_private *priv;
 391         struct ccw_device *cdev;
 392         struct subchannel *sch;
 393         int ret;
 394         unsigned long flags;
 395
 396         priv = container_of(work, struct ccw_device_private, kick_work);
 397         cdev = priv->cdev;
 398         spin_lock_irqsave(cdev->ccwlock, flags);
 399         sch = to_subchannel(cdev->dev.parent);
 400         if (sch->driver && sch->driver->notify) {
 401                 spin_unlock_irqrestore(cdev->ccwlock, flags);
 402                 ret = sch->driver->notify(&sch->dev, CIO_OPER);
 403                 spin_lock_irqsave(cdev->ccwlock, flags);
 404         } else
 405                 ret = 0;
 406         if (ret) {
 407                 /* Reenable channel measurements, if needed. */
 408                 spin_unlock_irqrestore(cdev->ccwlock, flags);
 409                 cmf_reenable(cdev);
 410                 spin_lock_irqsave(cdev->ccwlock, flags);
 411                 wake_up(&cdev->private->wait_q);
 412         }
 413         spin_unlock_irqrestore(cdev->ccwlock, flags);
 414         if (!ret)
 415                 /* Driver doesn't want device back. */
 416                 ccw_device_do_unreg_rereg(work);
 417 }
 418
 419 /*
 420  * Finished with online/offline processing.
 421  */
 422 static void
 423 ccw_device_done(struct ccw_device *cdev, int state)
 424 {
 425         struct subchannel *sch;
 426
 427         sch = to_subchannel(cdev->dev.parent);
 428
 429         ccw_device_set_timeout(cdev, 0);
 430
 431         if (state != DEV_STATE_ONLINE)
 432                 cio_disable_subchannel(sch);
 433
 434         /* Reset device status. */
 435         memset(&cdev->private->irb, 0, sizeof(struct irb));
 436
 437         cdev->private->state = state;
 438
 439
 440         if (state == DEV_STATE_BOXED)
 441                 CIO_DEBUG(KERN_WARNING, 2,
 442                           "cio: Boxed device %04x on subchannel %04x\n",
 443                           cdev->private->dev_id.devno, sch->schid.sch_no);
 444
 445         if (cdev->private->flags.donotify) {
 446                 cdev->private->flags.donotify = 0;
 447                 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify);
 448                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 449         }
 450         wake_up(&cdev->private->wait_q);
 451
 452         if (css_init_done && state != DEV_STATE_ONLINE)
 453                 put_device (&cdev->dev);
 454 }
 455
 456 static int cmp_pgid(struct pgid *p1, struct pgid *p2)
 457 {
 458         char *c1;
 459         char *c2;
 460
 461         c1 = (char *)p1;
 462         c2 = (char *)p2;
 463
 464         return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
 465 }
 466
 467 static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
 468 {
 469         int i;
 470         int last;
 471
 472         last = 0;
 473         for (i = 0; i < 8; i++) {
 474                 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
 475                         /* No PGID yet */
 476                         continue;
 477                 if (cdev->private->pgid[last].inf.ps.state1 ==
 478                     SNID_STATE1_RESET) {
 479                         /* First non-zero PGID */
 480                         last = i;
 481                         continue;
 482                 }
 483                 if (cmp_pgid(&cdev->private->pgid[i],
 484                              &cdev->private->pgid[last]) == 0)
 485                         /* Non-conflicting PGIDs */
 486                         continue;
 487
 488                 /* PGID mismatch, can't pathgroup. */
 489                 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
 490                               "0.%x.%04x, can't pathgroup\n",
 491                               cdev->private->dev_id.ssid,
 492                               cdev->private->dev_id.devno);
 493                 cdev->private->options.pgroup = 0;
 494                 return;
 495         }
 496         if (cdev->private->pgid[last].inf.ps.state1 ==
 497             SNID_STATE1_RESET)
 498                 /* No previous pgid found */
 499                 memcpy(&cdev->private->pgid[0],
 500                        &channel_subsystems[0]->global_pgid,
 501                        sizeof(struct pgid));
 502         else
 503                 /* Use existing pgid */
 504                 memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
 505                        sizeof(struct pgid));
 506 }
 507
 508 /*
 509  * Function called from device_pgid.c after sense path ground has completed.
 510  */
 511 void
 512 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
 513 {
 514         struct subchannel *sch;
 515
 516         sch = to_subchannel(cdev->dev.parent);
 517         switch (err) {
 518         case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
 519                 cdev->private->options.pgroup = 0;
 520                 break;
 521         case 0: /* success */
 522         case -EACCES: /* partial success, some paths not operational */
 523                 /* Check if all pgids are equal or 0. */
 524                 __ccw_device_get_common_pgid(cdev);
 525                 break;
 526         case -ETIME:            /* Sense path group id stopped by timeout. */
 527         case -EUSERS:           /* device is reserved for someone else. */
 528                 ccw_device_done(cdev, DEV_STATE_BOXED);
 529                 return;
 530         default:
 531                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 532                 return;
 533         }
 534         /* Start Path Group verification. */
 535         cdev->private->state = DEV_STATE_VERIFY;
 536         cdev->private->flags.doverify = 0;
 537         ccw_device_verify_start(cdev);
 538 }
 539
 540 /*
 541  * Start device recognition.
 542  */
 543 int
 544 ccw_device_recognition(struct ccw_device *cdev)
 545 {
 546         struct subchannel *sch;
 547         int ret;
 548
 549         if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
 550             (cdev->private->state != DEV_STATE_BOXED))
 551                 return -EINVAL;
 552         sch = to_subchannel(cdev->dev.parent);
 553         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 554         if (ret != 0)
 555                 /* Couldn't enable the subchannel for i/o. Sick device. */
 556                 return ret;
 557
 558         /* After 60s the device recognition is considered to have failed. */
 559         ccw_device_set_timeout(cdev, 60*HZ);
 560
 561         /*
 562          * We used to start here with a sense pgid to find out whether a device
 563          * is locked by someone else. Unfortunately, the sense pgid command
 564          * code has other meanings on devices predating the path grouping
 565          * algorithm, so we start with sense id and box the device after an
 566          * timeout (or if sense pgid during path verification detects the device
 567          * is locked, as may happen on newer devices).
 568          */
 569         cdev->private->flags.recog_done = 0;
 570         cdev->private->state = DEV_STATE_SENSE_ID;
 571         ccw_device_sense_id_start(cdev);
 572         return 0;
 573 }
 574
 575 /*
 576  * Handle timeout in device recognition.
 577  */
 578 static void
 579 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 580 {
 581         int ret;
 582
 583         ret = ccw_device_cancel_halt_clear(cdev);
 584         switch (ret) {
 585         case 0:
 586                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 587                 break;
 588         case -ENODEV:
 589                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 590                 break;
 591         default:
 592                 ccw_device_set_timeout(cdev, 3*HZ);
 593         }
 594 }
 595
 596
 597 void
 598 ccw_device_verify_done(struct ccw_device *cdev, int err)
 599 {
 600         struct subchannel *sch;
 601
 602         sch = to_subchannel(cdev->dev.parent);
 603         /* Update schib - pom may have changed. */
 604         stsch(sch->schid, &sch->schib);
 605         /* Update lpm with verified path mask. */
 606         sch->lpm = sch->vpm;
 607         /* Repeat path verification? */
 608         if (cdev->private->flags.doverify) {
 609                 cdev->private->flags.doverify = 0;
 610                 ccw_device_verify_start(cdev);
 611                 return;
 612         }
 613         switch (err) {
 614         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 615                 cdev->private->options.pgroup = 0;
 616         case 0:
 617                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 618                 /* Deliver fake irb to device driver, if needed. */
 619                 if (cdev->private->flags.fake_irb) {
 620                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 621                         cdev->private->irb.scsw.cc = 1;
 622                         cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC;
 623                         cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND;
 624                         cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND;
 625                         cdev->private->flags.fake_irb = 0;
 626                         if (cdev->handler)
 627                                 cdev->handler(cdev, cdev->private->intparm,
 628                                               &cdev->private->irb);
 629                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 630                 }
 631                 break;
 632         case -ETIME:
 633                 /* Reset oper notify indication after verify error. */
 634                 cdev->private->flags.donotify = 0;
 635                 ccw_device_done(cdev, DEV_STATE_BOXED);
 636                 break;
 637         default:
 638                 /* Reset oper notify indication after verify error. */
 639                 cdev->private->flags.donotify = 0;
 640                 if (cdev->online)
 641                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 642                 else
 643                         ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 644                 break;
 645         }
 646 }
 647
 648 /*
 649  * Get device online.
 650  */
 651 int
 652 ccw_device_online(struct ccw_device *cdev)
 653 {
 654         struct subchannel *sch;
 655         int ret;
 656
 657         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 658             (cdev->private->state != DEV_STATE_BOXED))
 659                 return -EINVAL;
 660         sch = to_subchannel(cdev->dev.parent);
 661         if (css_init_done && !get_device(&cdev->dev))
 662                 return -ENODEV;
 663         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 664         if (ret != 0) {
 665                 /* Couldn't enable the subchannel for i/o. Sick device. */
 666                 if (ret == -ENODEV)
 667                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 668                 return ret;
 669         }
 670         /* Do we want to do path grouping? */
 671         if (!cdev->private->options.pgroup) {
 672                 /* Start initial path verification. */
 673                 cdev->private->state = DEV_STATE_VERIFY;
 674                 cdev->private->flags.doverify = 0;
 675                 ccw_device_verify_start(cdev);
 676                 return 0;
 677         }
 678         /* Do a SensePGID first. */
 679         cdev->private->state = DEV_STATE_SENSE_PGID;
 680         ccw_device_sense_pgid_start(cdev);
 681         return 0;
 682 }
 683
 684 void
 685 ccw_device_disband_done(struct ccw_device *cdev, int err)
 686 {
 687         switch (err) {
 688         case 0:
 689                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 690                 break;
 691         case -ETIME:
 692                 ccw_device_done(cdev, DEV_STATE_BOXED);
 693                 break;
 694         default:
 695                 cdev->private->flags.donotify = 0;
 696                 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 697                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 698                 break;
 699         }
 700 }
 701
 702 /*
 703  * Shutdown device.
 704  */
 705 int
 706 ccw_device_offline(struct ccw_device *cdev)
 707 {
 708         struct subchannel *sch;
 709
 710         if (ccw_device_is_orphan(cdev)) {
 711                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 712                 return 0;
 713         }
 714         sch = to_subchannel(cdev->dev.parent);
 715         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
 716                 return -ENODEV;
 717         if (cdev->private->state != DEV_STATE_ONLINE) {
 718                 if (sch->schib.scsw.actl != 0)
 719                         return -EBUSY;
 720                 return -EINVAL;
 721         }
 722         if (sch->schib.scsw.actl != 0)
 723                 return -EBUSY;
 724         /* Are we doing path grouping? */
 725         if (!cdev->private->options.pgroup) {
 726                 /* No, set state offline immediately. */
 727                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 728                 return 0;
 729         }
 730         /* Start Set Path Group commands. */
 731         cdev->private->state = DEV_STATE_DISBAND_PGID;
 732         ccw_device_disband_start(cdev);
 733         return 0;
 734 }
 735
 736 /*
 737  * Handle timeout in device online/offline process.
 738  */
 739 static void
 740 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 741 {
 742         int ret;
 743
 744         ret = ccw_device_cancel_halt_clear(cdev);
 745         switch (ret) {
 746         case 0:
 747                 ccw_device_done(cdev, DEV_STATE_BOXED);
 748                 break;
 749         case -ENODEV:
 750                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 751                 break;
 752         default:
 753                 ccw_device_set_timeout(cdev, 3*HZ);
 754         }
 755 }
 756
 757 /*
 758  * Handle not oper event in device recognition.
 759  */
 760 static void
 761 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 762 {
 763         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 764 }
 765
 766 /*
 767  * Handle not operational event in non-special state.
 768  */
 769 static void ccw_device_generic_notoper(struct ccw_device *cdev,
 770                                        enum dev_event dev_event)
 771 {
 772         struct subchannel *sch;
 773
 774         cdev->private->state = DEV_STATE_NOT_OPER;
 775         sch = to_subchannel(cdev->dev.parent);
 776         css_schedule_eval(sch->schid);
 777 }
 778
 779 /*
 780  * Handle path verification event.
 781  */
 782 static void
 783 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 784 {
 785         struct subchannel *sch;
 786
 787         if (cdev->private->state == DEV_STATE_W4SENSE) {
 788                 cdev->private->flags.doverify = 1;
 789                 return;
 790         }
 791         sch = to_subchannel(cdev->dev.parent);
 792         /*
 793          * Since we might not just be coming from an interrupt from the
 794          * subchannel we have to update the schib.
 795          */
 796         stsch(sch->schid, &sch->schib);
 797
 798         if (sch->schib.scsw.actl != 0 ||
 799             (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) ||
 800             (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
 801                 /*
 802                  * No final status yet or final status not yet delivered
 803                  * to the device driver. Can't do path verfication now,
 804                  * delay until final status was delivered.
 805                  */
 806                 cdev->private->flags.doverify = 1;
 807                 return;
 808         }
 809         /* Device is idle, we can do the path verification. */
 810         cdev->private->state = DEV_STATE_VERIFY;
 811         cdev->private->flags.doverify = 0;
 812         ccw_device_verify_start(cdev);
 813 }
 814
 815 /*
 816  * Got an interrupt for a normal io (state online).
 817  */
 818 static void
 819 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 820 {
 821         struct irb *irb;
 822
 823         irb = (struct irb *) __LC_IRB;
 824         /* Check for unsolicited interrupt. */
 825         if ((irb->scsw.stctl ==
 826                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
 827             && (!irb->scsw.cc)) {
 828                 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 829                     !irb->esw.esw0.erw.cons) {
 830                         /* Unit check but no sense data. Need basic sense. */
 831                         if (ccw_device_do_sense(cdev, irb) != 0)
 832                                 goto call_handler_unsol;
 833                         memcpy(&cdev->private->irb, irb, sizeof(struct irb));
 834                         cdev->private->state = DEV_STATE_W4SENSE;
 835                         cdev->private->intparm = 0;
 836                         return;
 837                 }
 838 call_handler_unsol:
 839                 if (cdev->handler)
 840                         cdev->handler (cdev, 0, irb);
 841                 if (cdev->private->flags.doverify)
 842                         ccw_device_online_verify(cdev, 0);
 843                 return;
 844         }
 845         /* Accumulate status and find out if a basic sense is needed. */
 846         ccw_device_accumulate_irb(cdev, irb);
 847         if (cdev->private->flags.dosense) {
 848                 if (ccw_device_do_sense(cdev, irb) == 0) {
 849                         cdev->private->state = DEV_STATE_W4SENSE;
 850                 }
 851                 return;
 852         }
 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 /*
 860  * Got an timeout in online state.
 861  */
 862 static void
 863 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 864 {
 865         int ret;
 866
 867         ccw_device_set_timeout(cdev, 0);
 868         ret = ccw_device_cancel_halt_clear(cdev);
 869         if (ret == -EBUSY) {
 870                 ccw_device_set_timeout(cdev, 3*HZ);
 871                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 872                 return;
 873         }
 874         if (ret == -ENODEV)
 875                 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 876         else if (cdev->handler)
 877                 cdev->handler(cdev, cdev->private->intparm,
 878                               ERR_PTR(-ETIMEDOUT));
 879 }
 880
 881 /*
 882  * Got an interrupt for a basic sense.
 883  */
 884 static void
 885 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 886 {
 887         struct irb *irb;
 888
 889         irb = (struct irb *) __LC_IRB;
 890         /* Check for unsolicited interrupt. */
 891         if (irb->scsw.stctl ==
 892                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 893                 if (irb->scsw.cc == 1)
 894                         /* Basic sense hasn't started. Try again. */
 895                         ccw_device_do_sense(cdev, irb);
 896                 else {
 897                         CIO_MSG_EVENT(2, "Huh? 0.%x.%04x: unsolicited "
 898                                       "interrupt during w4sense...\n",
 899                                       cdev->private->dev_id.ssid,
 900                                       cdev->private->dev_id.devno);
 901                         if (cdev->handler)
 902                                 cdev->handler (cdev, 0, irb);
 903                 }
 904                 return;
 905         }
 906         /*
 907          * Check if a halt or clear has been issued in the meanwhile. If yes,
 908          * only deliver the halt/clear interrupt to the device driver as if it
 909          * had killed the original request.
 910          */
 911         if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
 912                 /* Retry Basic Sense if requested. */
 913                 if (cdev->private->flags.intretry) {
 914                         cdev->private->flags.intretry = 0;
 915                         ccw_device_do_sense(cdev, irb);
 916                         return;
 917                 }
 918                 cdev->private->flags.dosense = 0;
 919                 memset(&cdev->private->irb, 0, sizeof(struct irb));
 920                 ccw_device_accumulate_irb(cdev, irb);
 921                 goto call_handler;
 922         }
 923         /* Add basic sense info to irb. */
 924         ccw_device_accumulate_basic_sense(cdev, irb);
 925         if (cdev->private->flags.dosense) {
 926                 /* Another basic sense is needed. */
 927                 ccw_device_do_sense(cdev, irb);
 928                 return;
 929         }
 930 call_handler:
 931         cdev->private->state = DEV_STATE_ONLINE;
 932         /* Call the handler. */
 933         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 934                 /* Start delayed path verification. */
 935                 ccw_device_online_verify(cdev, 0);
 936 }
 937
 938 static void
 939 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 940 {
 941         struct irb *irb;
 942
 943         irb = (struct irb *) __LC_IRB;
 944         /* Accumulate status. We don't do basic sense. */
 945         ccw_device_accumulate_irb(cdev, irb);
 946         /* Remember to clear irb to avoid residuals. */
 947         memset(&cdev->private->irb, 0, sizeof(struct irb));
 948         /* Try to start delayed device verification. */
 949         ccw_device_online_verify(cdev, 0);
 950         /* Note: Don't call handler for cio initiated clear! */
 951 }
 952
 953 static void
 954 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
 955 {
 956         struct subchannel *sch;
 957
 958         sch = to_subchannel(cdev->dev.parent);
 959         ccw_device_set_timeout(cdev, 0);
 960         /* Start delayed path verification. */
 961         ccw_device_online_verify(cdev, 0);
 962         /* OK, i/o is dead now. Call interrupt handler. */
 963         if (cdev->handler)
 964                 cdev->handler(cdev, cdev->private->intparm,
 965                               ERR_PTR(-EIO));
 966 }
 967
 968 static void
 969 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 970 {
 971         int ret;
 972
 973         ret = ccw_device_cancel_halt_clear(cdev);
 974         if (ret == -EBUSY) {
 975                 ccw_device_set_timeout(cdev, 3*HZ);
 976                 return;
 977         }
 978         /* Start delayed path verification. */
 979         ccw_device_online_verify(cdev, 0);
 980         if (cdev->handler)
 981                 cdev->handler(cdev, cdev->private->intparm,
 982                               ERR_PTR(-EIO));
 983 }
 984
 985 void device_kill_io(struct subchannel *sch)
 986 {
 987         int ret;
 988         struct ccw_device *cdev;
 989
 990         cdev = sch->dev.driver_data;
 991         ret = ccw_device_cancel_halt_clear(cdev);
 992         if (ret == -EBUSY) {
 993                 ccw_device_set_timeout(cdev, 3*HZ);
 994                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 995                 return;
 996         }
 997         /* Start delayed path verification. */
 998         ccw_device_online_verify(cdev, 0);
 999         if (cdev->handler)
1000                 cdev->handler(cdev, cdev->private->intparm,
1001                               ERR_PTR(-EIO));
1002 }
1003
1004 static void
1005 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
1006 {
1007         /* Start verification after current task finished. */
1008         cdev->private->flags.doverify = 1;
1009 }
1010
1011 static void
1012 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1013 {
1014         struct irb *irb;
1015
1016         switch (dev_event) {
1017         case DEV_EVENT_INTERRUPT:
1018                 irb = (struct irb *) __LC_IRB;
1019                 /* Check for unsolicited interrupt. */
1020                 if ((irb->scsw.stctl ==
1021                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1022                     (!irb->scsw.cc))
1023                         /* FIXME: we should restart stlck here, but this
1024                          * is extremely unlikely ... */
1025                         goto out_wakeup;
1026
1027                 ccw_device_accumulate_irb(cdev, irb);
1028                 /* We don't care about basic sense etc. */
1029                 break;
1030         default: /* timeout */
1031                 break;
1032         }
1033 out_wakeup:
1034         wake_up(&cdev->private->wait_q);
1035 }
1036
1037 static void
1038 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1039 {
1040         struct subchannel *sch;
1041
1042         sch = to_subchannel(cdev->dev.parent);
1043         if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1044                 /* Couldn't enable the subchannel for i/o. Sick device. */
1045                 return;
1046
1047         /* After 60s the device recognition is considered to have failed. */
1048         ccw_device_set_timeout(cdev, 60*HZ);
1049
1050         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1051         ccw_device_sense_id_start(cdev);
1052 }
1053
1054 void
1055 device_trigger_reprobe(struct subchannel *sch)
1056 {
1057         struct ccw_device *cdev;
1058
1059         if (!sch->dev.driver_data)
1060                 return;
1061         cdev = sch->dev.driver_data;
1062         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1063                 return;
1064
1065         /* Update some values. */
1066         if (stsch(sch->schid, &sch->schib))
1067                 return;
1068         if (!sch->schib.pmcw.dnv)
1069                 return;
1070         /*
1071          * The pim, pam, pom values may not be accurate, but they are the best
1072          * we have before performing device selection :/
1073          */
1074         sch->lpm = sch->schib.pmcw.pam & sch->opm;
1075         /* Re-set some bits in the pmcw that were lost. */
1076         sch->schib.pmcw.isc = 3;
1077         sch->schib.pmcw.csense = 1;
1078         sch->schib.pmcw.ena = 0;
1079         if ((sch->lpm & (sch->lpm - 1)) != 0)
1080                 sch->schib.pmcw.mp = 1;
1081         sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1082         /* We should also udate ssd info, but this has to wait. */
1083         /* Check if this is another device which appeared on the same sch. */
1084         if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1085                 PREPARE_WORK(&cdev->private->kick_work,
1086                              ccw_device_move_to_orphanage);
1087                 queue_work(slow_path_wq, &cdev->private->kick_work);
1088         } else
1089                 ccw_device_start_id(cdev, 0);
1090 }
1091
1092 static void
1093 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1094 {
1095         struct subchannel *sch;
1096
1097         sch = to_subchannel(cdev->dev.parent);
1098         /*
1099          * An interrupt in state offline means a previous disable was not
1100          * successful. Try again.
1101          */
1102         cio_disable_subchannel(sch);
1103 }
1104
1105 static void
1106 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1107 {
1108         retry_set_schib(cdev);
1109         cdev->private->state = DEV_STATE_ONLINE;
1110         dev_fsm_event(cdev, dev_event);
1111 }
1112
1113 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1114                                        enum dev_event dev_event)
1115 {
1116         cmf_retry_copy_block(cdev);
1117         cdev->private->state = DEV_STATE_ONLINE;
1118         dev_fsm_event(cdev, dev_event);
1119 }
1120
1121 static void
1122 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1123 {
1124         ccw_device_set_timeout(cdev, 0);
1125         if (dev_event == DEV_EVENT_NOTOPER)
1126                 cdev->private->state = DEV_STATE_NOT_OPER;
1127         else
1128                 cdev->private->state = DEV_STATE_OFFLINE;
1129         wake_up(&cdev->private->wait_q);
1130 }
1131
1132 static void
1133 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1134 {
1135         int ret;
1136
1137         ret = ccw_device_cancel_halt_clear(cdev);
1138         switch (ret) {
1139         case 0:
1140                 cdev->private->state = DEV_STATE_OFFLINE;
1141                 wake_up(&cdev->private->wait_q);
1142                 break;
1143         case -ENODEV:
1144                 cdev->private->state = DEV_STATE_NOT_OPER;
1145                 wake_up(&cdev->private->wait_q);
1146                 break;
1147         default:
1148                 ccw_device_set_timeout(cdev, HZ/10);
1149         }
1150 }
1151
1152 /*
1153  * No operation action. This is used e.g. to ignore a timeout event in
1154  * state offline.
1155  */
1156 static void
1157 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1158 {
1159 }
1160
1161 /*
1162  * Bug operation action.
1163  */
1164 static void
1165 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1166 {
1167         CIO_MSG_EVENT(0, "dev_jumptable[%i][%i] == NULL\n",
1168                       cdev->private->state, dev_event);
1169         BUG();
1170 }
1171
1172 /*
1173  * device statemachine
1174  */
1175 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1176         [DEV_STATE_NOT_OPER] = {
1177                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1178                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1179                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1180                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1181         },
1182         [DEV_STATE_SENSE_PGID] = {
1183                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1184                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1185                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1186                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1187         },
1188         [DEV_STATE_SENSE_ID] = {
1189                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1190                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1191                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1192                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1193         },
1194         [DEV_STATE_OFFLINE] = {
1195                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1196                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1197                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1198                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1199         },
1200         [DEV_STATE_VERIFY] = {
1201                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1202                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1203                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1204                 [DEV_EVENT_VERIFY]      = ccw_device_delay_verify,
1205         },
1206         [DEV_STATE_ONLINE] = {
1207                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1208                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1209                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1210                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1211         },
1212         [DEV_STATE_W4SENSE] = {
1213                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1214                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1215                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1216                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1217         },
1218         [DEV_STATE_DISBAND_PGID] = {
1219                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1220                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1221                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1222                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1223         },
1224         [DEV_STATE_BOXED] = {
1225                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1226                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1227                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1228                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1229         },
1230         /* states to wait for i/o completion before doing something */
1231         [DEV_STATE_CLEAR_VERIFY] = {
1232                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1233                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1234                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1235                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1236         },
1237         [DEV_STATE_TIMEOUT_KILL] = {
1238                 [DEV_EVENT_NOTOPER]     = ccw_device_generic_notoper,
1239                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1240                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1241                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1242         },
1243         [DEV_STATE_QUIESCE] = {
1244                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1245                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1246                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1247                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1248         },
1249         /* special states for devices gone not operational */
1250         [DEV_STATE_DISCONNECTED] = {
1251                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1252                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1253                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1254                 [DEV_EVENT_VERIFY]      = ccw_device_start_id,
1255         },
1256         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1257                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1258                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1259                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1260                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1261         },
1262         [DEV_STATE_CMFCHANGE] = {
1263                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1264                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1265                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1266                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1267         },
1268         [DEV_STATE_CMFUPDATE] = {
1269                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1270                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1271                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1272                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1273         },
1274 };
1275
1276 /*
1277  * io_subchannel_irq is called for "real" interrupts or for status
1278  * pending conditions on msch.
1279  */
1280 void
1281 io_subchannel_irq (struct device *pdev)
1282 {
1283         struct ccw_device *cdev;
1284
1285         cdev = to_subchannel(pdev)->dev.driver_data;
1286
1287         CIO_TRACE_EVENT (3, "IRQ");
1288         CIO_TRACE_EVENT (3, pdev->bus_id);
1289         if (cdev)
1290                 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1291 }
1292
1293 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);