drivers/s390/char/tape_core.c

   1 /*
   2  *    basic function of the tape device driver
   3  *
   4  *  S390 and zSeries version
   5  *    Copyright IBM Corp. 2001, 2009
   6  *    Author(s): Carsten Otte <cotte@de.ibm.com>
   7  *               Michael Holzheu <holzheu@de.ibm.com>
   8  *               Tuan Ngo-Anh <ngoanh@de.ibm.com>
   9  *               Martin Schwidefsky <schwidefsky@de.ibm.com>
  10  *               Stefan Bader <shbader@de.ibm.com>
  11  */
  12
  13 #define KMSG_COMPONENT "tape"
  14 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  15
  16 #include <linux/module.h>
  17 #include <linux/init.h>      // for kernel parameters
  18 #include <linux/kmod.h>      // for requesting modules
  19 #include <linux/spinlock.h>  // for locks
  20 #include <linux/vmalloc.h>
  21 #include <linux/list.h>
  22 #include <linux/slab.h>
  23
  24 #include <asm/types.h>       // for variable types
  25
  26 #define TAPE_DBF_AREA   tape_core_dbf
  27
  28 #include "tape.h"
  29 #include "tape_std.h"
  30
  31 #define LONG_BUSY_TIMEOUT 180 /* seconds */
  32
  33 static void __tape_do_irq (struct ccw_device *, unsigned long, struct irb *);
  34 static void tape_delayed_next_request(struct work_struct *);
  35 static void tape_long_busy_timeout(struct timer_list *t);
  36
  37 /*
  38  * One list to contain all tape devices of all disciplines, so
  39  * we can assign the devices to minor numbers of the same major
  40  * The list is protected by the rwlock
  41  */
  42 static LIST_HEAD(tape_device_list);
  43 static DEFINE_RWLOCK(tape_device_lock);
  44
  45 /*
  46  * Pointer to debug area.
  47  */
  48 debug_info_t *TAPE_DBF_AREA = NULL;
  49 EXPORT_SYMBOL(TAPE_DBF_AREA);
  50
  51 /*
  52  * Printable strings for tape enumerations.
  53  */
  54 const char *tape_state_verbose[TS_SIZE] =
  55 {
  56         [TS_UNUSED]   = "UNUSED",
  57         [TS_IN_USE]   = "IN_USE",
  58         [TS_BLKUSE]   = "BLKUSE",
  59         [TS_INIT]     = "INIT  ",
  60         [TS_NOT_OPER] = "NOT_OP"
  61 };
  62
  63 const char *tape_op_verbose[TO_SIZE] =
  64 {
  65         [TO_BLOCK] = "BLK",     [TO_BSB] = "BSB",
  66         [TO_BSF] = "BSF",       [TO_DSE] = "DSE",
  67         [TO_FSB] = "FSB",       [TO_FSF] = "FSF",
  68         [TO_LBL] = "LBL",       [TO_NOP] = "NOP",
  69         [TO_RBA] = "RBA",       [TO_RBI] = "RBI",
  70         [TO_RFO] = "RFO",       [TO_REW] = "REW",
  71         [TO_RUN] = "RUN",       [TO_WRI] = "WRI",
  72         [TO_WTM] = "WTM",       [TO_MSEN] = "MSN",
  73         [TO_LOAD] = "LOA",      [TO_READ_CONFIG] = "RCF",
  74         [TO_READ_ATTMSG] = "RAT",
  75         [TO_DIS] = "DIS",       [TO_ASSIGN] = "ASS",
  76         [TO_UNASSIGN] = "UAS",  [TO_CRYPT_ON] = "CON",
  77         [TO_CRYPT_OFF] = "COF", [TO_KEKL_SET] = "KLS",
  78         [TO_KEKL_QUERY] = "KLQ",[TO_RDC] = "RDC",
  79 };
  80
  81 static int devid_to_int(struct ccw_dev_id *dev_id)
  82 {
  83         return dev_id->devno + (dev_id->ssid << 16);
  84 }
  85
  86 /*
  87  * Some channel attached tape specific attributes.
  88  *
  89  * FIXME: In the future the first_minor and blocksize attribute should be
  90  *        replaced by a link to the cdev tree.
  91  */
  92 static ssize_t
  93 tape_medium_state_show(struct device *dev, struct device_attribute *attr, char *buf)
  94 {
  95         struct tape_device *tdev;
  96
  97         tdev = dev_get_drvdata(dev);
  98         return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->medium_state);
  99 }
 100
 101 static
 102 DEVICE_ATTR(medium_state, 0444, tape_medium_state_show, NULL);
 103
 104 static ssize_t
 105 tape_first_minor_show(struct device *dev, struct device_attribute *attr, char *buf)
 106 {
 107         struct tape_device *tdev;
 108
 109         tdev = dev_get_drvdata(dev);
 110         return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->first_minor);
 111 }
 112
 113 static
 114 DEVICE_ATTR(first_minor, 0444, tape_first_minor_show, NULL);
 115
 116 static ssize_t
 117 tape_state_show(struct device *dev, struct device_attribute *attr, char *buf)
 118 {
 119         struct tape_device *tdev;
 120
 121         tdev = dev_get_drvdata(dev);
 122         return scnprintf(buf, PAGE_SIZE, "%s\n", (tdev->first_minor < 0) ?
 123                 "OFFLINE" : tape_state_verbose[tdev->tape_state]);
 124 }
 125
 126 static
 127 DEVICE_ATTR(state, 0444, tape_state_show, NULL);
 128
 129 static ssize_t
 130 tape_operation_show(struct device *dev, struct device_attribute *attr, char *buf)
 131 {
 132         struct tape_device *tdev;
 133         ssize_t rc;
 134
 135         tdev = dev_get_drvdata(dev);
 136         if (tdev->first_minor < 0)
 137                 return scnprintf(buf, PAGE_SIZE, "N/A\n");
 138
 139         spin_lock_irq(get_ccwdev_lock(tdev->cdev));
 140         if (list_empty(&tdev->req_queue))
 141                 rc = scnprintf(buf, PAGE_SIZE, "---\n");
 142         else {
 143                 struct tape_request *req;
 144
 145                 req = list_entry(tdev->req_queue.next, struct tape_request,
 146                         list);
 147                 rc = scnprintf(buf,PAGE_SIZE, "%s\n", tape_op_verbose[req->op]);
 148         }
 149         spin_unlock_irq(get_ccwdev_lock(tdev->cdev));
 150         return rc;
 151 }
 152
 153 static
 154 DEVICE_ATTR(operation, 0444, tape_operation_show, NULL);
 155
 156 static ssize_t
 157 tape_blocksize_show(struct device *dev, struct device_attribute *attr, char *buf)
 158 {
 159         struct tape_device *tdev;
 160
 161         tdev = dev_get_drvdata(dev);
 162
 163         return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->char_data.block_size);
 164 }
 165
 166 static
 167 DEVICE_ATTR(blocksize, 0444, tape_blocksize_show, NULL);
 168
 169 static struct attribute *tape_attrs[] = {
 170         &dev_attr_medium_state.attr,
 171         &dev_attr_first_minor.attr,
 172         &dev_attr_state.attr,
 173         &dev_attr_operation.attr,
 174         &dev_attr_blocksize.attr,
 175         NULL
 176 };
 177
 178 static const struct attribute_group tape_attr_group = {
 179         .attrs = tape_attrs,
 180 };
 181
 182 /*
 183  * Tape state functions
 184  */
 185 void
 186 tape_state_set(struct tape_device *device, enum tape_state newstate)
 187 {
 188         const char *str;
 189
 190         if (device->tape_state == TS_NOT_OPER) {
 191                 DBF_EVENT(3, "ts_set err: not oper\n");
 192                 return;
 193         }
 194         DBF_EVENT(4, "ts. dev:  %x\n", device->first_minor);
 195         DBF_EVENT(4, "old ts:\t\n");
 196         if (device->tape_state < TS_SIZE && device->tape_state >=0 )
 197                 str = tape_state_verbose[device->tape_state];
 198         else
 199                 str = "UNKNOWN TS";
 200         DBF_EVENT(4, "%s\n", str);
 201         DBF_EVENT(4, "new ts:\t\n");
 202         if (newstate < TS_SIZE && newstate >= 0)
 203                 str = tape_state_verbose[newstate];
 204         else
 205                 str = "UNKNOWN TS";
 206         DBF_EVENT(4, "%s\n", str);
 207         device->tape_state = newstate;
 208         wake_up(&device->state_change_wq);
 209 }
 210
 211 struct tape_med_state_work_data {
 212         struct tape_device *device;
 213         enum tape_medium_state state;
 214         struct work_struct  work;
 215 };
 216
 217 static void
 218 tape_med_state_work_handler(struct work_struct *work)
 219 {
 220         static char env_state_loaded[] = "MEDIUM_STATE=LOADED";
 221         static char env_state_unloaded[] = "MEDIUM_STATE=UNLOADED";
 222         struct tape_med_state_work_data *p =
 223                 container_of(work, struct tape_med_state_work_data, work);
 224         struct tape_device *device = p->device;
 225         char *envp[] = { NULL, NULL };
 226
 227         switch (p->state) {
 228         case MS_UNLOADED:
 229                 pr_info("%s: The tape cartridge has been successfully "
 230                         "unloaded\n", dev_name(&device->cdev->dev));
 231                 envp[0] = env_state_unloaded;
 232                 kobject_uevent_env(&device->cdev->dev.kobj, KOBJ_CHANGE, envp);
 233                 break;
 234         case MS_LOADED:
 235                 pr_info("%s: A tape cartridge has been mounted\n",
 236                         dev_name(&device->cdev->dev));
 237                 envp[0] = env_state_loaded;
 238                 kobject_uevent_env(&device->cdev->dev.kobj, KOBJ_CHANGE, envp);
 239                 break;
 240         default:
 241                 break;
 242         }
 243         tape_put_device(device);
 244         kfree(p);
 245 }
 246
 247 static void
 248 tape_med_state_work(struct tape_device *device, enum tape_medium_state state)
 249 {
 250         struct tape_med_state_work_data *p;
 251
 252         p = kzalloc(sizeof(*p), GFP_ATOMIC);
 253         if (p) {
 254                 INIT_WORK(&p->work, tape_med_state_work_handler);
 255                 p->device = tape_get_device(device);
 256                 p->state = state;
 257                 schedule_work(&p->work);
 258         }
 259 }
 260
 261 void
 262 tape_med_state_set(struct tape_device *device, enum tape_medium_state newstate)
 263 {
 264         enum tape_medium_state oldstate;
 265
 266         oldstate = device->medium_state;
 267         if (oldstate == newstate)
 268                 return;
 269         device->medium_state = newstate;
 270         switch(newstate){
 271         case MS_UNLOADED:
 272                 device->tape_generic_status |= GMT_DR_OPEN(~0);
 273                 if (oldstate == MS_LOADED)
 274                         tape_med_state_work(device, MS_UNLOADED);
 275                 break;
 276         case MS_LOADED:
 277                 device->tape_generic_status &= ~GMT_DR_OPEN(~0);
 278                 if (oldstate == MS_UNLOADED)
 279                         tape_med_state_work(device, MS_LOADED);
 280                 break;
 281         default:
 282                 break;
 283         }
 284         wake_up(&device->state_change_wq);
 285 }
 286
 287 /*
 288  * Stop running ccw. Has to be called with the device lock held.
 289  */
 290 static int
 291 __tape_cancel_io(struct tape_device *device, struct tape_request *request)
 292 {
 293         int retries;
 294         int rc;
 295
 296         /* Check if interrupt has already been processed */
 297         if (request->callback == NULL)
 298                 return 0;
 299
 300         rc = 0;
 301         for (retries = 0; retries < 5; retries++) {
 302                 rc = ccw_device_clear(device->cdev, (long) request);
 303
 304                 switch (rc) {
 305                         case 0:
 306                                 request->status = TAPE_REQUEST_DONE;
 307                                 return 0;
 308                         case -EBUSY:
 309                                 request->status = TAPE_REQUEST_CANCEL;
 310                                 schedule_delayed_work(&device->tape_dnr, 0);
 311                                 return 0;
 312                         case -ENODEV:
 313                                 DBF_EXCEPTION(2, "device gone, retry\n");
 314                                 break;
 315                         case -EIO:
 316                                 DBF_EXCEPTION(2, "I/O error, retry\n");
 317                                 break;
 318                         default:
 319                                 BUG();
 320                 }
 321         }
 322
 323         return rc;
 324 }
 325
 326 /*
 327  * Add device into the sorted list, giving it the first
 328  * available minor number.
 329  */
 330 static int
 331 tape_assign_minor(struct tape_device *device)
 332 {
 333         struct tape_device *tmp;
 334         int minor;
 335
 336         minor = 0;
 337         write_lock(&tape_device_lock);
 338         list_for_each_entry(tmp, &tape_device_list, node) {
 339                 if (minor < tmp->first_minor)
 340                         break;
 341                 minor += TAPE_MINORS_PER_DEV;
 342         }
 343         if (minor >= 256) {
 344                 write_unlock(&tape_device_lock);
 345                 return -ENODEV;
 346         }
 347         device->first_minor = minor;
 348         list_add_tail(&device->node, &tmp->node);
 349         write_unlock(&tape_device_lock);
 350         return 0;
 351 }
 352
 353 /* remove device from the list */
 354 static void
 355 tape_remove_minor(struct tape_device *device)
 356 {
 357         write_lock(&tape_device_lock);
 358         list_del_init(&device->node);
 359         device->first_minor = -1;
 360         write_unlock(&tape_device_lock);
 361 }
 362
 363 /*
 364  * Set a device online.
 365  *
 366  * This function is called by the common I/O layer to move a device from the
 367  * detected but offline into the online state.
 368  * If we return an error (RC < 0) the device remains in the offline state. This
 369  * can happen if the device is assigned somewhere else, for example.
 370  */
 371 int
 372 tape_generic_online(struct tape_device *device,
 373                    struct tape_discipline *discipline)
 374 {
 375         int rc;
 376
 377         DBF_LH(6, "tape_enable_device(%p, %p)\n", device, discipline);
 378
 379         if (device->tape_state != TS_INIT) {
 380                 DBF_LH(3, "Tapestate not INIT (%d)\n", device->tape_state);
 381                 return -EINVAL;
 382         }
 383
 384         timer_setup(&device->lb_timeout, tape_long_busy_timeout, 0);
 385
 386         /* Let the discipline have a go at the device. */
 387         device->discipline = discipline;
 388         if (!try_module_get(discipline->owner)) {
 389                 return -EINVAL;
 390         }
 391
 392         rc = discipline->setup_device(device);
 393         if (rc)
 394                 goto out;
 395         rc = tape_assign_minor(device);
 396         if (rc)
 397                 goto out_discipline;
 398
 399         rc = tapechar_setup_device(device);
 400         if (rc)
 401                 goto out_minor;
 402
 403         tape_state_set(device, TS_UNUSED);
 404
 405         DBF_LH(3, "(%08x): Drive set online\n", device->cdev_id);
 406
 407         return 0;
 408
 409 out_minor:
 410         tape_remove_minor(device);
 411 out_discipline:
 412         device->discipline->cleanup_device(device);
 413         device->discipline = NULL;
 414 out:
 415         module_put(discipline->owner);
 416         return rc;
 417 }
 418
 419 static void
 420 tape_cleanup_device(struct tape_device *device)
 421 {
 422         tapechar_cleanup_device(device);
 423         device->discipline->cleanup_device(device);
 424         module_put(device->discipline->owner);
 425         tape_remove_minor(device);
 426         tape_med_state_set(device, MS_UNKNOWN);
 427 }
 428
 429 /*
 430  * Suspend device.
 431  *
 432  * Called by the common I/O layer if the drive should be suspended on user
 433  * request. We refuse to suspend if the device is loaded or in use for the
 434  * following reason:
 435  * While the Linux guest is suspended, it might be logged off which causes
 436  * devices to be detached. Tape devices are automatically rewound and unloaded
 437  * during DETACH processing (unless the tape device was attached with the
 438  * NOASSIGN or MULTIUSER option). After rewind/unload, there is no way to
 439  * resume the original state of the tape device, since we would need to
 440  * manually re-load the cartridge which was active at suspend time.
 441  */
 442 int tape_generic_pm_suspend(struct ccw_device *cdev)
 443 {
 444         struct tape_device *device;
 445
 446         device = dev_get_drvdata(&cdev->dev);
 447         if (!device) {
 448                 return -ENODEV;
 449         }
 450
 451         DBF_LH(3, "(%08x): tape_generic_pm_suspend(%p)\n",
 452                 device->cdev_id, device);
 453
 454         if (device->medium_state != MS_UNLOADED) {
 455                 pr_err("A cartridge is loaded in tape device %s, "
 456                        "refusing to suspend\n", dev_name(&cdev->dev));
 457                 return -EBUSY;
 458         }
 459
 460         spin_lock_irq(get_ccwdev_lock(device->cdev));
 461         switch (device->tape_state) {
 462                 case TS_INIT:
 463                 case TS_NOT_OPER:
 464                 case TS_UNUSED:
 465                         spin_unlock_irq(get_ccwdev_lock(device->cdev));
 466                         break;
 467                 default:
 468                         pr_err("Tape device %s is busy, refusing to "
 469                                "suspend\n", dev_name(&cdev->dev));
 470                         spin_unlock_irq(get_ccwdev_lock(device->cdev));
 471                         return -EBUSY;
 472         }
 473
 474         DBF_LH(3, "(%08x): Drive suspended.\n", device->cdev_id);
 475         return 0;
 476 }
 477
 478 /*
 479  * Set device offline.
 480  *
 481  * Called by the common I/O layer if the drive should set offline on user
 482  * request. We may prevent this by returning an error.
 483  * Manual offline is only allowed while the drive is not in use.
 484  */
 485 int
 486 tape_generic_offline(struct ccw_device *cdev)
 487 {
 488         struct tape_device *device;
 489
 490         device = dev_get_drvdata(&cdev->dev);
 491         if (!device) {
 492                 return -ENODEV;
 493         }
 494
 495         DBF_LH(3, "(%08x): tape_generic_offline(%p)\n",
 496                 device->cdev_id, device);
 497
 498         spin_lock_irq(get_ccwdev_lock(device->cdev));
 499         switch (device->tape_state) {
 500                 case TS_INIT:
 501                 case TS_NOT_OPER:
 502                         spin_unlock_irq(get_ccwdev_lock(device->cdev));
 503                         break;
 504                 case TS_UNUSED:
 505                         tape_state_set(device, TS_INIT);
 506                         spin_unlock_irq(get_ccwdev_lock(device->cdev));
 507                         tape_cleanup_device(device);
 508                         break;
 509                 default:
 510                         DBF_EVENT(3, "(%08x): Set offline failed "
 511                                 "- drive in use.\n",
 512                                 device->cdev_id);
 513                         spin_unlock_irq(get_ccwdev_lock(device->cdev));
 514                         return -EBUSY;
 515         }
 516
 517         DBF_LH(3, "(%08x): Drive set offline.\n", device->cdev_id);
 518         return 0;
 519 }
 520
 521 /*
 522  * Allocate memory for a new device structure.
 523  */
 524 static struct tape_device *
 525 tape_alloc_device(void)
 526 {
 527         struct tape_device *device;
 528
 529         device = kzalloc(sizeof(struct tape_device), GFP_KERNEL);
 530         if (device == NULL) {
 531                 DBF_EXCEPTION(2, "ti:no mem\n");
 532                 return ERR_PTR(-ENOMEM);
 533         }
 534         device->modeset_byte = kmalloc(1, GFP_KERNEL | GFP_DMA);
 535         if (device->modeset_byte == NULL) {
 536                 DBF_EXCEPTION(2, "ti:no mem\n");
 537                 kfree(device);
 538                 return ERR_PTR(-ENOMEM);
 539         }
 540         mutex_init(&device->mutex);
 541         INIT_LIST_HEAD(&device->req_queue);
 542         INIT_LIST_HEAD(&device->node);
 543         init_waitqueue_head(&device->state_change_wq);
 544         init_waitqueue_head(&device->wait_queue);
 545         device->tape_state = TS_INIT;
 546         device->medium_state = MS_UNKNOWN;
 547         *device->modeset_byte = 0;
 548         device->first_minor = -1;
 549         atomic_set(&device->ref_count, 1);
 550         INIT_DELAYED_WORK(&device->tape_dnr, tape_delayed_next_request);
 551
 552         return device;
 553 }
 554
 555 /*
 556  * Get a reference to an existing device structure. This will automatically
 557  * increment the reference count.
 558  */
 559 struct tape_device *
 560 tape_get_device(struct tape_device *device)
 561 {
 562         int count;
 563
 564         count = atomic_inc_return(&device->ref_count);
 565         DBF_EVENT(4, "tape_get_device(%p) = %i\n", device, count);
 566         return device;
 567 }
 568
 569 /*
 570  * Decrease the reference counter of a devices structure. If the
 571  * reference counter reaches zero free the device structure.
 572  * The function returns a NULL pointer to be used by the caller
 573  * for clearing reference pointers.
 574  */
 575 void
 576 tape_put_device(struct tape_device *device)
 577 {
 578         int count;
 579
 580         count = atomic_dec_return(&device->ref_count);
 581         DBF_EVENT(4, "tape_put_device(%p) -> %i\n", device, count);
 582         BUG_ON(count < 0);
 583         if (count == 0) {
 584                 kfree(device->modeset_byte);
 585                 kfree(device);
 586         }
 587 }
 588
 589 /*
 590  * Find tape device by a device index.
 591  */
 592 struct tape_device *
 593 tape_find_device(int devindex)
 594 {
 595         struct tape_device *device, *tmp;
 596
 597         device = ERR_PTR(-ENODEV);
 598         read_lock(&tape_device_lock);
 599         list_for_each_entry(tmp, &tape_device_list, node) {
 600                 if (tmp->first_minor / TAPE_MINORS_PER_DEV == devindex) {
 601                         device = tape_get_device(tmp);
 602                         break;
 603                 }
 604         }
 605         read_unlock(&tape_device_lock);
 606         return device;
 607 }
 608
 609 /*
 610  * Driverfs tape probe function.
 611  */
 612 int
 613 tape_generic_probe(struct ccw_device *cdev)
 614 {
 615         struct tape_device *device;
 616         int ret;
 617         struct ccw_dev_id dev_id;
 618
 619         device = tape_alloc_device();
 620         if (IS_ERR(device))
 621                 return -ENODEV;
 622         ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP |
 623                                      CCWDEV_DO_MULTIPATH);
 624         ret = sysfs_create_group(&cdev->dev.kobj, &tape_attr_group);
 625         if (ret) {
 626                 tape_put_device(device);
 627                 return ret;
 628         }
 629         dev_set_drvdata(&cdev->dev, device);
 630         cdev->handler = __tape_do_irq;
 631         device->cdev = cdev;
 632         ccw_device_get_id(cdev, &dev_id);
 633         device->cdev_id = devid_to_int(&dev_id);
 634         return ret;
 635 }
 636
 637 static void
 638 __tape_discard_requests(struct tape_device *device)
 639 {
 640         struct tape_request *   request;
 641         struct list_head *      l, *n;
 642
 643         list_for_each_safe(l, n, &device->req_queue) {
 644                 request = list_entry(l, struct tape_request, list);
 645                 if (request->status == TAPE_REQUEST_IN_IO)
 646                         request->status = TAPE_REQUEST_DONE;
 647                 list_del(&request->list);
 648
 649                 /* Decrease ref_count for removed request. */
 650                 request->device = NULL;
 651                 tape_put_device(device);
 652                 request->rc = -EIO;
 653                 if (request->callback != NULL)
 654                         request->callback(request, request->callback_data);
 655         }
 656 }
 657
 658 /*
 659  * Driverfs tape remove function.
 660  *
 661  * This function is called whenever the common I/O layer detects the device
 662  * gone. This can happen at any time and we cannot refuse.
 663  */
 664 void
 665 tape_generic_remove(struct ccw_device *cdev)
 666 {
 667         struct tape_device *    device;
 668
 669         device = dev_get_drvdata(&cdev->dev);
 670         if (!device) {
 671                 return;
 672         }
 673         DBF_LH(3, "(%08x): tape_generic_remove(%p)\n", device->cdev_id, cdev);
 674
 675         spin_lock_irq(get_ccwdev_lock(device->cdev));
 676         switch (device->tape_state) {
 677                 case TS_INIT:
 678                         tape_state_set(device, TS_NOT_OPER);
 679                 case TS_NOT_OPER:
 680                         /*
 681                          * Nothing to do.
 682                          */
 683                         spin_unlock_irq(get_ccwdev_lock(device->cdev));
 684                         break;
 685                 case TS_UNUSED:
 686                         /*
 687                          * Need only to release the device.
 688                          */
 689                         tape_state_set(device, TS_NOT_OPER);
 690                         spin_unlock_irq(get_ccwdev_lock(device->cdev));
 691                         tape_cleanup_device(device);
 692                         break;
 693                 default:
 694                         /*
 695                          * There may be requests on the queue. We will not get
 696                          * an interrupt for a request that was running. So we
 697                          * just post them all as I/O errors.
 698                          */
 699                         DBF_EVENT(3, "(%08x): Drive in use vanished!\n",
 700                                 device->cdev_id);
 701                         pr_warn("%s: A tape unit was detached while in use\n",
 702                                 dev_name(&device->cdev->dev));
 703                         tape_state_set(device, TS_NOT_OPER);
 704                         __tape_discard_requests(device);
 705                         spin_unlock_irq(get_ccwdev_lock(device->cdev));
 706                         tape_cleanup_device(device);
 707         }
 708
 709         device = dev_get_drvdata(&cdev->dev);
 710         if (device) {
 711                 sysfs_remove_group(&cdev->dev.kobj, &tape_attr_group);
 712                 dev_set_drvdata(&cdev->dev, NULL);
 713                 tape_put_device(device);
 714         }
 715 }
 716
 717 /*
 718  * Allocate a new tape ccw request
 719  */
 720 struct tape_request *
 721 tape_alloc_request(int cplength, int datasize)
 722 {
 723         struct tape_request *request;
 724
 725         BUG_ON(datasize > PAGE_SIZE || (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
 726
 727         DBF_LH(6, "tape_alloc_request(%d, %d)\n", cplength, datasize);
 728
 729         request = kzalloc(sizeof(struct tape_request), GFP_KERNEL);
 730         if (request == NULL) {
 731                 DBF_EXCEPTION(1, "cqra nomem\n");
 732                 return ERR_PTR(-ENOMEM);
 733         }
 734         /* allocate channel program */
 735         if (cplength > 0) {
 736                 request->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
 737                                           GFP_ATOMIC | GFP_DMA);
 738                 if (request->cpaddr == NULL) {
 739                         DBF_EXCEPTION(1, "cqra nomem\n");
 740                         kfree(request);
 741                         return ERR_PTR(-ENOMEM);
 742                 }
 743         }
 744         /* alloc small kernel buffer */
 745         if (datasize > 0) {
 746                 request->cpdata = kzalloc(datasize, GFP_KERNEL | GFP_DMA);
 747                 if (request->cpdata == NULL) {
 748                         DBF_EXCEPTION(1, "cqra nomem\n");
 749                         kfree(request->cpaddr);
 750                         kfree(request);
 751                         return ERR_PTR(-ENOMEM);
 752                 }
 753         }
 754         DBF_LH(6, "New request %p(%p/%p)\n", request, request->cpaddr,
 755                 request->cpdata);
 756
 757         return request;
 758 }
 759
 760 /*
 761  * Free tape ccw request
 762  */
 763 void
 764 tape_free_request (struct tape_request * request)
 765 {
 766         DBF_LH(6, "Free request %p\n", request);
 767
 768         if (request->device)
 769                 tape_put_device(request->device);
 770         kfree(request->cpdata);
 771         kfree(request->cpaddr);
 772         kfree(request);
 773 }
 774
 775 static int
 776 __tape_start_io(struct tape_device *device, struct tape_request *request)
 777 {
 778         int rc;
 779
 780         rc = ccw_device_start(
 781                 device->cdev,
 782                 request->cpaddr,
 783                 (unsigned long) request,
 784                 0x00,
 785                 request->options
 786         );
 787         if (rc == 0) {
 788                 request->status = TAPE_REQUEST_IN_IO;
 789         } else if (rc == -EBUSY) {
 790                 /* The common I/O subsystem is currently busy. Retry later. */
 791                 request->status = TAPE_REQUEST_QUEUED;
 792                 schedule_delayed_work(&device->tape_dnr, 0);
 793                 rc = 0;
 794         } else {
 795                 /* Start failed. Remove request and indicate failure. */
 796                 DBF_EVENT(1, "tape: start request failed with RC = %i\n", rc);
 797         }
 798         return rc;
 799 }
 800
 801 static void
 802 __tape_start_next_request(struct tape_device *device)
 803 {
 804         struct list_head *l, *n;
 805         struct tape_request *request;
 806         int rc;
 807
 808         DBF_LH(6, "__tape_start_next_request(%p)\n", device);
 809         /*
 810          * Try to start each request on request queue until one is
 811          * started successful.
 812          */
 813         list_for_each_safe(l, n, &device->req_queue) {
 814                 request = list_entry(l, struct tape_request, list);
 815
 816                 /*
 817                  * Avoid race condition if bottom-half was triggered more than
 818                  * once.
 819                  */
 820                 if (request->status == TAPE_REQUEST_IN_IO)
 821                         return;
 822                 /*
 823                  * Request has already been stopped. We have to wait until
 824                  * the request is removed from the queue in the interrupt
 825                  * handling.
 826                  */
 827                 if (request->status == TAPE_REQUEST_DONE)
 828                         return;
 829
 830                 /*
 831                  * We wanted to cancel the request but the common I/O layer
 832                  * was busy at that time. This can only happen if this
 833                  * function is called by delayed_next_request.
 834                  * Otherwise we start the next request on the queue.
 835                  */
 836                 if (request->status == TAPE_REQUEST_CANCEL) {
 837                         rc = __tape_cancel_io(device, request);
 838                 } else {
 839                         rc = __tape_start_io(device, request);
 840                 }
 841                 if (rc == 0)
 842                         return;
 843
 844                 /* Set ending status. */
 845                 request->rc = rc;
 846                 request->status = TAPE_REQUEST_DONE;
 847
 848                 /* Remove from request queue. */
 849                 list_del(&request->list);
 850
 851                 /* Do callback. */
 852                 if (request->callback != NULL)
 853                         request->callback(request, request->callback_data);
 854         }
 855 }
 856
 857 static void
 858 tape_delayed_next_request(struct work_struct *work)
 859 {
 860         struct tape_device *device =
 861                 container_of(work, struct tape_device, tape_dnr.work);
 862
 863         DBF_LH(6, "tape_delayed_next_request(%p)\n", device);
 864         spin_lock_irq(get_ccwdev_lock(device->cdev));
 865         __tape_start_next_request(device);
 866         spin_unlock_irq(get_ccwdev_lock(device->cdev));
 867 }
 868
 869 static void tape_long_busy_timeout(struct timer_list *t)
 870 {
 871         struct tape_device *device = from_timer(device, t, lb_timeout);
 872         struct tape_request *request;
 873
 874         spin_lock_irq(get_ccwdev_lock(device->cdev));
 875         request = list_entry(device->req_queue.next, struct tape_request, list);
 876         BUG_ON(request->status != TAPE_REQUEST_LONG_BUSY);
 877         DBF_LH(6, "%08x: Long busy timeout.\n", device->cdev_id);
 878         __tape_start_next_request(device);
 879         tape_put_device(device);
 880         spin_unlock_irq(get_ccwdev_lock(device->cdev));
 881 }
 882
 883 static void
 884 __tape_end_request(
 885         struct tape_device *    device,
 886         struct tape_request *   request,
 887         int                     rc)
 888 {
 889         DBF_LH(6, "__tape_end_request(%p, %p, %i)\n", device, request, rc);
 890         if (request) {
 891                 request->rc = rc;
 892                 request->status = TAPE_REQUEST_DONE;
 893
 894                 /* Remove from request queue. */
 895                 list_del(&request->list);
 896
 897                 /* Do callback. */
 898                 if (request->callback != NULL)
 899                         request->callback(request, request->callback_data);
 900         }
 901
 902         /* Start next request. */
 903         if (!list_empty(&device->req_queue))
 904                 __tape_start_next_request(device);
 905 }
 906
 907 /*
 908  * Write sense data to dbf
 909  */
 910 void
 911 tape_dump_sense_dbf(struct tape_device *device, struct tape_request *request,
 912                     struct irb *irb)
 913 {
 914         unsigned int *sptr;
 915         const char* op;
 916
 917         if (request != NULL)
 918                 op = tape_op_verbose[request->op];
 919         else
 920                 op = "---";
 921         DBF_EVENT(3, "DSTAT : %02x   CSTAT: %02x\n",
 922                   irb->scsw.cmd.dstat, irb->scsw.cmd.cstat);
 923         DBF_EVENT(3, "DEVICE: %08x OP\t: %s\n", device->cdev_id, op);
 924         sptr = (unsigned int *) irb->ecw;
 925         DBF_EVENT(3, "%08x %08x\n", sptr[0], sptr[1]);
 926         DBF_EVENT(3, "%08x %08x\n", sptr[2], sptr[3]);
 927         DBF_EVENT(3, "%08x %08x\n", sptr[4], sptr[5]);
 928         DBF_EVENT(3, "%08x %08x\n", sptr[6], sptr[7]);
 929 }
 930
 931 /*
 932  * I/O helper function. Adds the request to the request queue
 933  * and starts it if the tape is idle. Has to be called with
 934  * the device lock held.
 935  */
 936 static int
 937 __tape_start_request(struct tape_device *device, struct tape_request *request)
 938 {
 939         int rc;
 940
 941         switch (request->op) {
 942                 case TO_MSEN:
 943                 case TO_ASSIGN:
 944                 case TO_UNASSIGN:
 945                 case TO_READ_ATTMSG:
 946                 case TO_RDC:
 947                         if (device->tape_state == TS_INIT)
 948                                 break;
 949                         if (device->tape_state == TS_UNUSED)
 950                                 break;
 951                 default:
 952                         if (device->tape_state == TS_BLKUSE)
 953                                 break;
 954                         if (device->tape_state != TS_IN_USE)
 955                                 return -ENODEV;
 956         }
 957
 958         /* Increase use count of device for the added request. */
 959         request->device = tape_get_device(device);
 960
 961         if (list_empty(&device->req_queue)) {
 962                 /* No other requests are on the queue. Start this one. */
 963                 rc = __tape_start_io(device, request);
 964                 if (rc)
 965                         return rc;
 966
 967                 DBF_LH(5, "Request %p added for execution.\n", request);
 968                 list_add(&request->list, &device->req_queue);
 969         } else {
 970                 DBF_LH(5, "Request %p add to queue.\n", request);
 971                 request->status = TAPE_REQUEST_QUEUED;
 972                 list_add_tail(&request->list, &device->req_queue);
 973         }
 974         return 0;
 975 }
 976
 977 /*
 978  * Add the request to the request queue, try to start it if the
 979  * tape is idle. Return without waiting for end of i/o.
 980  */
 981 int
 982 tape_do_io_async(struct tape_device *device, struct tape_request *request)
 983 {
 984         int rc;
 985
 986         DBF_LH(6, "tape_do_io_async(%p, %p)\n", device, request);
 987
 988         spin_lock_irq(get_ccwdev_lock(device->cdev));
 989         /* Add request to request queue and try to start it. */
 990         rc = __tape_start_request(device, request);
 991         spin_unlock_irq(get_ccwdev_lock(device->cdev));
 992         return rc;
 993 }
 994
 995 /*
 996  * tape_do_io/__tape_wake_up
 997  * Add the request to the request queue, try to start it if the
 998  * tape is idle and wait uninterruptible for its completion.
 999  */
1000 static void
1001 __tape_wake_up(struct tape_request *request, void *data)
1002 {
1003         request->callback = NULL;
1004         wake_up((wait_queue_head_t *) data);
1005 }
1006
1007 int
1008 tape_do_io(struct tape_device *device, struct tape_request *request)
1009 {
1010         int rc;
1011
1012         spin_lock_irq(get_ccwdev_lock(device->cdev));
1013         /* Setup callback */
1014         request->callback = __tape_wake_up;
1015         request->callback_data = &device->wait_queue;
1016         /* Add request to request queue and try to start it. */
1017         rc = __tape_start_request(device, request);
1018         spin_unlock_irq(get_ccwdev_lock(device->cdev));
1019         if (rc)
1020                 return rc;
1021         /* Request added to the queue. Wait for its completion. */
1022         wait_event(device->wait_queue, (request->callback == NULL));
1023         /* Get rc from request */
1024         return request->rc;
1025 }
1026
1027 /*
1028  * tape_do_io_interruptible/__tape_wake_up_interruptible
1029  * Add the request to the request queue, try to start it if the
1030  * tape is idle and wait uninterruptible for its completion.
1031  */
1032 static void
1033 __tape_wake_up_interruptible(struct tape_request *request, void *data)
1034 {
1035         request->callback = NULL;
1036         wake_up_interruptible((wait_queue_head_t *) data);
1037 }
1038
1039 int
1040 tape_do_io_interruptible(struct tape_device *device,
1041                          struct tape_request *request)
1042 {
1043         int rc;
1044
1045         spin_lock_irq(get_ccwdev_lock(device->cdev));
1046         /* Setup callback */
1047         request->callback = __tape_wake_up_interruptible;
1048         request->callback_data = &device->wait_queue;
1049         rc = __tape_start_request(device, request);
1050         spin_unlock_irq(get_ccwdev_lock(device->cdev));
1051         if (rc)
1052                 return rc;
1053         /* Request added to the queue. Wait for its completion. */
1054         rc = wait_event_interruptible(device->wait_queue,
1055                                       (request->callback == NULL));
1056         if (rc != -ERESTARTSYS)
1057                 /* Request finished normally. */
1058                 return request->rc;
1059
1060         /* Interrupted by a signal. We have to stop the current request. */
1061         spin_lock_irq(get_ccwdev_lock(device->cdev));
1062         rc = __tape_cancel_io(device, request);
1063         spin_unlock_irq(get_ccwdev_lock(device->cdev));
1064         if (rc == 0) {
1065                 /* Wait for the interrupt that acknowledges the halt. */
1066                 do {
1067                         rc = wait_event_interruptible(
1068                                 device->wait_queue,
1069                                 (request->callback == NULL)
1070                         );
1071                 } while (rc == -ERESTARTSYS);
1072
1073                 DBF_EVENT(3, "IO stopped on %08x\n", device->cdev_id);
1074                 rc = -ERESTARTSYS;
1075         }
1076         return rc;
1077 }
1078
1079 /*
1080  * Stop running ccw.
1081  */
1082 int
1083 tape_cancel_io(struct tape_device *device, struct tape_request *request)
1084 {
1085         int rc;
1086
1087         spin_lock_irq(get_ccwdev_lock(device->cdev));
1088         rc = __tape_cancel_io(device, request);
1089         spin_unlock_irq(get_ccwdev_lock(device->cdev));
1090         return rc;
1091 }
1092
1093 /*
1094  * Tape interrupt routine, called from the ccw_device layer
1095  */
1096 static void
1097 __tape_do_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1098 {
1099         struct tape_device *device;
1100         struct tape_request *request;
1101         int rc;
1102
1103         device = dev_get_drvdata(&cdev->dev);
1104         if (device == NULL) {
1105                 return;
1106         }
1107         request = (struct tape_request *) intparm;
1108
1109         DBF_LH(6, "__tape_do_irq(device=%p, request=%p)\n", device, request);
1110
1111         /* On special conditions irb is an error pointer */
1112         if (IS_ERR(irb)) {
1113                 /* FIXME: What to do with the request? */
1114                 switch (PTR_ERR(irb)) {
1115                         case -ETIMEDOUT:
1116                                 DBF_LH(1, "(%08x): Request timed out\n",
1117                                        device->cdev_id);
1118                         case -EIO:
1119                                 __tape_end_request(device, request, -EIO);
1120                                 break;
1121                         default:
1122                                 DBF_LH(1, "(%08x): Unexpected i/o error %li\n",
1123                                        device->cdev_id, PTR_ERR(irb));
1124                 }
1125                 return;
1126         }
1127
1128         /*
1129          * If the condition code is not zero and the start function bit is
1130          * still set, this is an deferred error and the last start I/O did
1131          * not succeed. At this point the condition that caused the deferred
1132          * error might still apply. So we just schedule the request to be
1133          * started later.
1134          */
1135         if (irb->scsw.cmd.cc != 0 &&
1136             (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1137             (request->status == TAPE_REQUEST_IN_IO)) {
1138                 DBF_EVENT(3,"(%08x): deferred cc=%i, fctl=%i. restarting\n",
1139                         device->cdev_id, irb->scsw.cmd.cc, irb->scsw.cmd.fctl);
1140                 request->status = TAPE_REQUEST_QUEUED;
1141                 schedule_delayed_work(&device->tape_dnr, HZ);
1142                 return;
1143         }
1144
1145         /* May be an unsolicited irq */
1146         if(request != NULL)
1147                 request->rescnt = irb->scsw.cmd.count;
1148         else if ((irb->scsw.cmd.dstat == 0x85 || irb->scsw.cmd.dstat == 0x80) &&
1149                  !list_empty(&device->req_queue)) {
1150                 /* Not Ready to Ready after long busy ? */
1151                 struct tape_request *req;
1152                 req = list_entry(device->req_queue.next,
1153                                  struct tape_request, list);
1154                 if (req->status == TAPE_REQUEST_LONG_BUSY) {
1155                         DBF_EVENT(3, "(%08x): del timer\n", device->cdev_id);
1156                         if (del_timer(&device->lb_timeout)) {
1157                                 tape_put_device(device);
1158                                 __tape_start_next_request(device);
1159                         }
1160                         return;
1161                 }
1162         }
1163         if (irb->scsw.cmd.dstat != 0x0c) {
1164                 /* Set the 'ONLINE' flag depending on sense byte 1 */
1165                 if(*(((__u8 *) irb->ecw) + 1) & SENSE_DRIVE_ONLINE)
1166                         device->tape_generic_status |= GMT_ONLINE(~0);
1167                 else
1168                         device->tape_generic_status &= ~GMT_ONLINE(~0);
1169
1170                 /*
1171                  * Any request that does not come back with channel end
1172                  * and device end is unusual. Log the sense data.
1173                  */
1174                 DBF_EVENT(3,"-- Tape Interrupthandler --\n");
1175                 tape_dump_sense_dbf(device, request, irb);
1176         } else {
1177                 /* Upon normal completion the device _is_ online */
1178                 device->tape_generic_status |= GMT_ONLINE(~0);
1179         }
1180         if (device->tape_state == TS_NOT_OPER) {
1181                 DBF_EVENT(6, "tape:device is not operational\n");
1182                 return;
1183         }
1184
1185         /*
1186          * Request that were canceled still come back with an interrupt.
1187          * To detect these request the state will be set to TAPE_REQUEST_DONE.
1188          */
1189         if(request != NULL && request->status == TAPE_REQUEST_DONE) {
1190                 __tape_end_request(device, request, -EIO);
1191                 return;
1192         }
1193
1194         rc = device->discipline->irq(device, request, irb);
1195         /*
1196          * rc < 0 : request finished unsuccessfully.
1197          * rc == TAPE_IO_SUCCESS: request finished successfully.
1198          * rc == TAPE_IO_PENDING: request is still running. Ignore rc.
1199          * rc == TAPE_IO_RETRY: request finished but needs another go.
1200          * rc == TAPE_IO_STOP: request needs to get terminated.
1201          */
1202         switch (rc) {
1203                 case TAPE_IO_SUCCESS:
1204                         /* Upon normal completion the device _is_ online */
1205                         device->tape_generic_status |= GMT_ONLINE(~0);
1206                         __tape_end_request(device, request, rc);
1207                         break;
1208                 case TAPE_IO_PENDING:
1209                         break;
1210                 case TAPE_IO_LONG_BUSY:
1211                         device->lb_timeout.expires = jiffies +
1212                                 LONG_BUSY_TIMEOUT * HZ;
1213                         DBF_EVENT(3, "(%08x): add timer\n", device->cdev_id);
1214                         add_timer(&device->lb_timeout);
1215                         request->status = TAPE_REQUEST_LONG_BUSY;
1216                         break;
1217                 case TAPE_IO_RETRY:
1218                         rc = __tape_start_io(device, request);
1219                         if (rc)
1220                                 __tape_end_request(device, request, rc);
1221                         break;
1222                 case TAPE_IO_STOP:
1223                         rc = __tape_cancel_io(device, request);
1224                         if (rc)
1225                                 __tape_end_request(device, request, rc);
1226                         break;
1227                 default:
1228                         if (rc > 0) {
1229                                 DBF_EVENT(6, "xunknownrc\n");
1230                                 __tape_end_request(device, request, -EIO);
1231                         } else {
1232                                 __tape_end_request(device, request, rc);
1233                         }
1234                         break;
1235         }
1236 }
1237
1238 /*
1239  * Tape device open function used by tape_char frontend.
1240  */
1241 int
1242 tape_open(struct tape_device *device)
1243 {
1244         int rc;
1245
1246         spin_lock_irq(get_ccwdev_lock(device->cdev));
1247         if (device->tape_state == TS_NOT_OPER) {
1248                 DBF_EVENT(6, "TAPE:nodev\n");
1249                 rc = -ENODEV;
1250         } else if (device->tape_state == TS_IN_USE) {
1251                 DBF_EVENT(6, "TAPE:dbusy\n");
1252                 rc = -EBUSY;
1253         } else if (device->tape_state == TS_BLKUSE) {
1254                 DBF_EVENT(6, "TAPE:dbusy\n");
1255                 rc = -EBUSY;
1256         } else if (device->discipline != NULL &&
1257                    !try_module_get(device->discipline->owner)) {
1258                 DBF_EVENT(6, "TAPE:nodisc\n");
1259                 rc = -ENODEV;
1260         } else {
1261                 tape_state_set(device, TS_IN_USE);
1262                 rc = 0;
1263         }
1264         spin_unlock_irq(get_ccwdev_lock(device->cdev));
1265         return rc;
1266 }
1267
1268 /*
1269  * Tape device release function used by tape_char frontend.
1270  */
1271 int
1272 tape_release(struct tape_device *device)
1273 {
1274         spin_lock_irq(get_ccwdev_lock(device->cdev));
1275         if (device->tape_state == TS_IN_USE)
1276                 tape_state_set(device, TS_UNUSED);
1277         module_put(device->discipline->owner);
1278         spin_unlock_irq(get_ccwdev_lock(device->cdev));
1279         return 0;
1280 }
1281
1282 /*
1283  * Execute a magnetic tape command a number of times.
1284  */
1285 int
1286 tape_mtop(struct tape_device *device, int mt_op, int mt_count)
1287 {
1288         tape_mtop_fn fn;
1289         int rc;
1290
1291         DBF_EVENT(6, "TAPE:mtio\n");
1292         DBF_EVENT(6, "TAPE:ioop: %x\n", mt_op);
1293         DBF_EVENT(6, "TAPE:arg:  %x\n", mt_count);
1294
1295         if (mt_op < 0 || mt_op >= TAPE_NR_MTOPS)
1296                 return -EINVAL;
1297         fn = device->discipline->mtop_array[mt_op];
1298         if (fn == NULL)
1299                 return -EINVAL;
1300
1301         /* We assume that the backends can handle count up to 500. */
1302         if (mt_op == MTBSR  || mt_op == MTFSR  || mt_op == MTFSF  ||
1303             mt_op == MTBSF  || mt_op == MTFSFM || mt_op == MTBSFM) {
1304                 rc = 0;
1305                 for (; mt_count > 500; mt_count -= 500)
1306                         if ((rc = fn(device, 500)) != 0)
1307                                 break;
1308                 if (rc == 0)
1309                         rc = fn(device, mt_count);
1310         } else
1311                 rc = fn(device, mt_count);
1312         return rc;
1313
1314 }
1315
1316 /*
1317  * Tape init function.
1318  */
1319 static int
1320 tape_init (void)
1321 {
1322         TAPE_DBF_AREA = debug_register ( "tape", 2, 2, 4*sizeof(long));
1323         debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view);
1324 #ifdef DBF_LIKE_HELL
1325         debug_set_level(TAPE_DBF_AREA, 6);
1326 #endif
1327         DBF_EVENT(3, "tape init\n");
1328         tape_proc_init();
1329         tapechar_init ();
1330         return 0;
1331 }
1332
1333 /*
1334  * Tape exit function.
1335  */
1336 static void
1337 tape_exit(void)
1338 {
1339         DBF_EVENT(6, "tape exit\n");
1340
1341         /* Get rid of the frontends */
1342         tapechar_exit();
1343         tape_proc_cleanup();
1344         debug_unregister (TAPE_DBF_AREA);
1345 }
1346
1347 MODULE_AUTHOR("(C) 2001 IBM Deutschland Entwicklung GmbH by Carsten Otte and "
1348               "Michael Holzheu (cotte@de.ibm.com,holzheu@de.ibm.com)");
1349 MODULE_DESCRIPTION("Linux on zSeries channel attached tape device driver");
1350 MODULE_LICENSE("GPL");
1351
1352 module_init(tape_init);
1353 module_exit(tape_exit);
1354
1355 EXPORT_SYMBOL(tape_generic_remove);
1356 EXPORT_SYMBOL(tape_generic_probe);
1357 EXPORT_SYMBOL(tape_generic_online);
1358 EXPORT_SYMBOL(tape_generic_offline);
1359 EXPORT_SYMBOL(tape_generic_pm_suspend);
1360 EXPORT_SYMBOL(tape_put_device);
1361 EXPORT_SYMBOL(tape_get_device);
1362 EXPORT_SYMBOL(tape_state_verbose);
1363 EXPORT_SYMBOL(tape_op_verbose);
1364 EXPORT_SYMBOL(tape_state_set);
1365 EXPORT_SYMBOL(tape_med_state_set);
1366 EXPORT_SYMBOL(tape_alloc_request);
1367 EXPORT_SYMBOL(tape_free_request);
1368 EXPORT_SYMBOL(tape_dump_sense_dbf);
1369 EXPORT_SYMBOL(tape_do_io);
1370 EXPORT_SYMBOL(tape_do_io_async);
1371 EXPORT_SYMBOL(tape_do_io_interruptible);
1372 EXPORT_SYMBOL(tape_cancel_io);
1373 EXPORT_SYMBOL(tape_mtop);