git.oblomov.eu Git - linux-2.6/blob - drivers/s390/char/tape_core.c

   1 /*
   2  *  drivers/s390/char/tape_core.c
   3  *    basic function of the tape device driver
   4  *
   5  *  S390 and zSeries version
   6  *    Copyright IBM Corp. 2001,2006
   7  *    Author(s): Carsten Otte <cotte@de.ibm.com>
   8  *               Michael Holzheu <holzheu@de.ibm.com>
   9  *               Tuan Ngo-Anh <ngoanh@de.ibm.com>
  10  *               Martin Schwidefsky <schwidefsky@de.ibm.com>
  11  *               Stefan Bader <shbader@de.ibm.com>
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/init.h>      // for kernel parameters
  16 #include <linux/kmod.h>      // for requesting modules
  17 #include <linux/spinlock.h>  // for locks
  18 #include <linux/vmalloc.h>
  19 #include <linux/list.h>
  20
  21 #include <asm/types.h>       // for variable types
  22
  23 #define TAPE_DBF_AREA   tape_core_dbf
  24
  25 #include "tape.h"
  26 #include "tape_std.h"
  27
  28 #define PRINTK_HEADER "TAPE_CORE: "
  29 #define LONG_BUSY_TIMEOUT 180 /* seconds */
  30
  31 static void __tape_do_irq (struct ccw_device *, unsigned long, struct irb *);
  32 static void tape_delayed_next_request(struct work_struct *);
  33 static void tape_long_busy_timeout(unsigned long data);
  34
  35 /*
  36  * One list to contain all tape devices of all disciplines, so
  37  * we can assign the devices to minor numbers of the same major
  38  * The list is protected by the rwlock
  39  */
  40 static LIST_HEAD(tape_device_list);
  41 static DEFINE_RWLOCK(tape_device_lock);
  42
  43 /*
  44  * Pointer to debug area.
  45  */
  46 debug_info_t *TAPE_DBF_AREA = NULL;
  47 EXPORT_SYMBOL(TAPE_DBF_AREA);
  48
  49 /*
  50  * Printable strings for tape enumerations.
  51  */
  52 const char *tape_state_verbose[TS_SIZE] =
  53 {
  54         [TS_UNUSED]   = "UNUSED",
  55         [TS_IN_USE]   = "IN_USE",
  56         [TS_BLKUSE]   = "BLKUSE",
  57         [TS_INIT]     = "INIT  ",
  58         [TS_NOT_OPER] = "NOT_OP"
  59 };
  60
  61 const char *tape_op_verbose[TO_SIZE] =
  62 {
  63         [TO_BLOCK] = "BLK",     [TO_BSB] = "BSB",
  64         [TO_BSF] = "BSF",       [TO_DSE] = "DSE",
  65         [TO_FSB] = "FSB",       [TO_FSF] = "FSF",
  66         [TO_LBL] = "LBL",       [TO_NOP] = "NOP",
  67         [TO_RBA] = "RBA",       [TO_RBI] = "RBI",
  68         [TO_RFO] = "RFO",       [TO_REW] = "REW",
  69         [TO_RUN] = "RUN",       [TO_WRI] = "WRI",
  70         [TO_WTM] = "WTM",       [TO_MSEN] = "MSN",
  71         [TO_LOAD] = "LOA",      [TO_READ_CONFIG] = "RCF",
  72         [TO_READ_ATTMSG] = "RAT",
  73         [TO_DIS] = "DIS",       [TO_ASSIGN] = "ASS",
  74         [TO_UNASSIGN] = "UAS",  [TO_CRYPT_ON] = "CON",
  75         [TO_CRYPT_OFF] = "COF", [TO_KEKL_SET] = "KLS",
  76         [TO_KEKL_QUERY] = "KLQ",[TO_RDC] = "RDC",
  77 };
  78
  79 static int
  80 busid_to_int(char *bus_id)
  81 {
  82         int     dec;
  83         int     d;
  84         char *  s;
  85
  86         for(s = bus_id, d = 0; *s != '\0' && *s != '.'; s++)
  87                 d = (d * 10) + (*s - '0');
  88         dec = d;
  89         for(s++, d = 0; *s != '\0' && *s != '.'; s++)
  90                 d = (d * 10) + (*s - '0');
  91         dec = (dec << 8) + d;
  92
  93         for(s++; *s != '\0'; s++) {
  94                 if (*s >= '0' && *s <= '9') {
  95                         d = *s - '0';
  96                 } else if (*s >= 'a' && *s <= 'f') {
  97                         d = *s - 'a' + 10;
  98                 } else {
  99                         d = *s - 'A' + 10;
 100                 }
 101                 dec = (dec << 4) + d;
 102         }
 103
 104         return dec;
 105 }
 106
 107 /*
 108  * Some channel attached tape specific attributes.
 109  *
 110  * FIXME: In the future the first_minor and blocksize attribute should be
 111  *        replaced by a link to the cdev tree.
 112  */
 113 static ssize_t
 114 tape_medium_state_show(struct device *dev, struct device_attribute *attr, char *buf)
 115 {
 116         struct tape_device *tdev;
 117
 118         tdev = (struct tape_device *) dev->driver_data;
 119         return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->medium_state);
 120 }
 121
 122 static
 123 DEVICE_ATTR(medium_state, 0444, tape_medium_state_show, NULL);
 124
 125 static ssize_t
 126 tape_first_minor_show(struct device *dev, struct device_attribute *attr, char *buf)
 127 {
 128         struct tape_device *tdev;
 129
 130         tdev = (struct tape_device *) dev->driver_data;
 131         return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->first_minor);
 132 }
 133
 134 static
 135 DEVICE_ATTR(first_minor, 0444, tape_first_minor_show, NULL);
 136
 137 static ssize_t
 138 tape_state_show(struct device *dev, struct device_attribute *attr, char *buf)
 139 {
 140         struct tape_device *tdev;
 141
 142         tdev = (struct tape_device *) dev->driver_data;
 143         return scnprintf(buf, PAGE_SIZE, "%s\n", (tdev->first_minor < 0) ?
 144                 "OFFLINE" : tape_state_verbose[tdev->tape_state]);
 145 }
 146
 147 static
 148 DEVICE_ATTR(state, 0444, tape_state_show, NULL);
 149
 150 static ssize_t
 151 tape_operation_show(struct device *dev, struct device_attribute *attr, char *buf)
 152 {
 153         struct tape_device *tdev;
 154         ssize_t rc;
 155
 156         tdev = (struct tape_device *) dev->driver_data;
 157         if (tdev->first_minor < 0)
 158                 return scnprintf(buf, PAGE_SIZE, "N/A\n");
 159
 160         spin_lock_irq(get_ccwdev_lock(tdev->cdev));
 161         if (list_empty(&tdev->req_queue))
 162                 rc = scnprintf(buf, PAGE_SIZE, "---\n");
 163         else {
 164                 struct tape_request *req;
 165
 166                 req = list_entry(tdev->req_queue.next, struct tape_request,
 167                         list);
 168                 rc = scnprintf(buf,PAGE_SIZE, "%s\n", tape_op_verbose[req->op]);
 169         }
 170         spin_unlock_irq(get_ccwdev_lock(tdev->cdev));
 171         return rc;
 172 }
 173
 174 static
 175 DEVICE_ATTR(operation, 0444, tape_operation_show, NULL);
 176
 177 static ssize_t
 178 tape_blocksize_show(struct device *dev, struct device_attribute *attr, char *buf)
 179 {
 180         struct tape_device *tdev;
 181
 182         tdev = (struct tape_device *) dev->driver_data;
 183
 184         return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->char_data.block_size);
 185 }
 186
 187 static
 188 DEVICE_ATTR(blocksize, 0444, tape_blocksize_show, NULL);
 189
 190 static struct attribute *tape_attrs[] = {
 191         &dev_attr_medium_state.attr,
 192         &dev_attr_first_minor.attr,
 193         &dev_attr_state.attr,
 194         &dev_attr_operation.attr,
 195         &dev_attr_blocksize.attr,
 196         NULL
 197 };
 198
 199 static struct attribute_group tape_attr_group = {
 200         .attrs = tape_attrs,
 201 };
 202
 203 /*
 204  * Tape state functions
 205  */
 206 void
 207 tape_state_set(struct tape_device *device, enum tape_state newstate)
 208 {
 209         const char *str;
 210
 211         if (device->tape_state == TS_NOT_OPER) {
 212                 DBF_EVENT(3, "ts_set err: not oper\n");
 213                 return;
 214         }
 215         DBF_EVENT(4, "ts. dev:  %x\n", device->first_minor);
 216         DBF_EVENT(4, "old ts:\t\n");
 217         if (device->tape_state < TS_SIZE && device->tape_state >=0 )
 218                 str = tape_state_verbose[device->tape_state];
 219         else
 220                 str = "UNKNOWN TS";
 221         DBF_EVENT(4, "%s\n", str);
 222         DBF_EVENT(4, "new ts:\t\n");
 223         if (newstate < TS_SIZE && newstate >= 0)
 224                 str = tape_state_verbose[newstate];
 225         else
 226                 str = "UNKNOWN TS";
 227         DBF_EVENT(4, "%s\n", str);
 228         device->tape_state = newstate;
 229         wake_up(&device->state_change_wq);
 230 }
 231
 232 void
 233 tape_med_state_set(struct tape_device *device, enum tape_medium_state newstate)
 234 {
 235         if (device->medium_state == newstate)
 236                 return;
 237         switch(newstate){
 238         case MS_UNLOADED:
 239                 device->tape_generic_status |= GMT_DR_OPEN(~0);
 240                 PRINT_INFO("(%s): Tape is unloaded\n",
 241                            device->cdev->dev.bus_id);
 242                 break;
 243         case MS_LOADED:
 244                 device->tape_generic_status &= ~GMT_DR_OPEN(~0);
 245                 PRINT_INFO("(%s): Tape has been mounted\n",
 246                            device->cdev->dev.bus_id);
 247                 break;
 248         default:
 249                 // print nothing
 250                 break;
 251         }
 252         device->medium_state = newstate;
 253         wake_up(&device->state_change_wq);
 254 }
 255
 256 /*
 257  * Stop running ccw. Has to be called with the device lock held.
 258  */
 259 static int
 260 __tape_cancel_io(struct tape_device *device, struct tape_request *request)
 261 {
 262         int retries;
 263         int rc;
 264
 265         /* Check if interrupt has already been processed */
 266         if (request->callback == NULL)
 267                 return 0;
 268
 269         rc = 0;
 270         for (retries = 0; retries < 5; retries++) {
 271                 rc = ccw_device_clear(device->cdev, (long) request);
 272
 273                 switch (rc) {
 274                         case 0:
 275                                 request->status = TAPE_REQUEST_DONE;
 276                                 return 0;
 277                         case -EBUSY:
 278                                 request->status = TAPE_REQUEST_CANCEL;
 279                                 schedule_delayed_work(&device->tape_dnr, 0);
 280                                 return 0;
 281                         case -ENODEV:
 282                                 DBF_EXCEPTION(2, "device gone, retry\n");
 283                                 break;
 284                         case -EIO:
 285                                 DBF_EXCEPTION(2, "I/O error, retry\n");
 286                                 break;
 287                         default:
 288                                 BUG();
 289                 }
 290         }
 291
 292         return rc;
 293 }
 294
 295 /*
 296  * Add device into the sorted list, giving it the first
 297  * available minor number.
 298  */
 299 static int
 300 tape_assign_minor(struct tape_device *device)
 301 {
 302         struct tape_device *tmp;
 303         int minor;
 304
 305         minor = 0;
 306         write_lock(&tape_device_lock);
 307         list_for_each_entry(tmp, &tape_device_list, node) {
 308                 if (minor < tmp->first_minor)
 309                         break;
 310                 minor += TAPE_MINORS_PER_DEV;
 311         }
 312         if (minor >= 256) {
 313                 write_unlock(&tape_device_lock);
 314                 return -ENODEV;
 315         }
 316         device->first_minor = minor;
 317         list_add_tail(&device->node, &tmp->node);
 318         write_unlock(&tape_device_lock);
 319         return 0;
 320 }
 321
 322 /* remove device from the list */
 323 static void
 324 tape_remove_minor(struct tape_device *device)
 325 {
 326         write_lock(&tape_device_lock);
 327         list_del_init(&device->node);
 328         device->first_minor = -1;
 329         write_unlock(&tape_device_lock);
 330 }
 331
 332 /*
 333  * Set a device online.
 334  *
 335  * This function is called by the common I/O layer to move a device from the
 336  * detected but offline into the online state.
 337  * If we return an error (RC < 0) the device remains in the offline state. This
 338  * can happen if the device is assigned somewhere else, for example.
 339  */
 340 int
 341 tape_generic_online(struct tape_device *device,
 342                    struct tape_discipline *discipline)
 343 {
 344         int rc;
 345
 346         DBF_LH(6, "tape_enable_device(%p, %p)\n", device, discipline);
 347
 348         if (device->tape_state != TS_INIT) {
 349                 DBF_LH(3, "Tapestate not INIT (%d)\n", device->tape_state);
 350                 return -EINVAL;
 351         }
 352
 353         init_timer(&device->lb_timeout);
 354         device->lb_timeout.function = tape_long_busy_timeout;
 355
 356         /* Let the discipline have a go at the device. */
 357         device->discipline = discipline;
 358         if (!try_module_get(discipline->owner)) {
 359                 PRINT_ERR("Cannot get module. Module gone.\n");
 360                 return -EINVAL;
 361         }
 362
 363         rc = discipline->setup_device(device);
 364         if (rc)
 365                 goto out;
 366         rc = tape_assign_minor(device);
 367         if (rc)
 368                 goto out_discipline;
 369
 370         rc = tapechar_setup_device(device);
 371         if (rc)
 372                 goto out_minor;
 373         rc = tapeblock_setup_device(device);
 374         if (rc)
 375                 goto out_char;
 376
 377         tape_state_set(device, TS_UNUSED);
 378
 379         DBF_LH(3, "(%08x): Drive set online\n", device->cdev_id);
 380
 381         return 0;
 382
 383 out_char:
 384         tapechar_cleanup_device(device);
 385 out_discipline:
 386         device->discipline->cleanup_device(device);
 387         device->discipline = NULL;
 388 out_minor:
 389         tape_remove_minor(device);
 390 out:
 391         module_put(discipline->owner);
 392         return rc;
 393 }
 394
 395 static void
 396 tape_cleanup_device(struct tape_device *device)
 397 {
 398         tapeblock_cleanup_device(device);
 399         tapechar_cleanup_device(device);
 400         device->discipline->cleanup_device(device);
 401         module_put(device->discipline->owner);
 402         tape_remove_minor(device);
 403         tape_med_state_set(device, MS_UNKNOWN);
 404 }
 405
 406 /*
 407  * Set device offline.
 408  *
 409  * Called by the common I/O layer if the drive should set offline on user
 410  * request. We may prevent this by returning an error.
 411  * Manual offline is only allowed while the drive is not in use.
 412  */
 413 int
 414 tape_generic_offline(struct tape_device *device)
 415 {
 416         if (!device) {
 417                 PRINT_ERR("tape_generic_offline: no such device\n");
 418                 return -ENODEV;
 419         }
 420
 421         DBF_LH(3, "(%08x): tape_generic_offline(%p)\n",
 422                 device->cdev_id, device);
 423
 424         spin_lock_irq(get_ccwdev_lock(device->cdev));
 425         switch (device->tape_state) {
 426                 case TS_INIT:
 427                 case TS_NOT_OPER:
 428                         spin_unlock_irq(get_ccwdev_lock(device->cdev));
 429                         break;
 430                 case TS_UNUSED:
 431                         tape_state_set(device, TS_INIT);
 432                         spin_unlock_irq(get_ccwdev_lock(device->cdev));
 433                         tape_cleanup_device(device);
 434                         break;
 435                 default:
 436                         DBF_EVENT(3, "(%08x): Set offline failed "
 437                                 "- drive in use.\n",
 438                                 device->cdev_id);
 439                         PRINT_WARN("(%s): Set offline failed "
 440                                 "- drive in use.\n",
 441                                 device->cdev->dev.bus_id);
 442                         spin_unlock_irq(get_ccwdev_lock(device->cdev));
 443                         return -EBUSY;
 444         }
 445
 446         DBF_LH(3, "(%08x): Drive set offline.\n", device->cdev_id);
 447         return 0;
 448 }
 449
 450 /*
 451  * Allocate memory for a new device structure.
 452  */
 453 static struct tape_device *
 454 tape_alloc_device(void)
 455 {
 456         struct tape_device *device;
 457
 458         device = kzalloc(sizeof(struct tape_device), GFP_KERNEL);
 459         if (device == NULL) {
 460                 DBF_EXCEPTION(2, "ti:no mem\n");
 461                 PRINT_INFO ("can't allocate memory for "
 462                             "tape info structure\n");
 463                 return ERR_PTR(-ENOMEM);
 464         }
 465         device->modeset_byte = kmalloc(1, GFP_KERNEL | GFP_DMA);
 466         if (device->modeset_byte == NULL) {
 467                 DBF_EXCEPTION(2, "ti:no mem\n");
 468                 PRINT_INFO("can't allocate memory for modeset byte\n");
 469                 kfree(device);
 470                 return ERR_PTR(-ENOMEM);
 471         }
 472         INIT_LIST_HEAD(&device->req_queue);
 473         INIT_LIST_HEAD(&device->node);
 474         init_waitqueue_head(&device->state_change_wq);
 475         device->tape_state = TS_INIT;
 476         device->medium_state = MS_UNKNOWN;
 477         *device->modeset_byte = 0;
 478         device->first_minor = -1;
 479         atomic_set(&device->ref_count, 1);
 480         INIT_DELAYED_WORK(&device->tape_dnr, tape_delayed_next_request);
 481
 482         return device;
 483 }
 484
 485 /*
 486  * Get a reference to an existing device structure. This will automatically
 487  * increment the reference count.
 488  */
 489 struct tape_device *
 490 tape_get_device_reference(struct tape_device *device)
 491 {
 492         DBF_EVENT(4, "tape_get_device_reference(%p) = %i\n", device,
 493                 atomic_inc_return(&device->ref_count));
 494
 495         return device;
 496 }
 497
 498 /*
 499  * Decrease the reference counter of a devices structure. If the
 500  * reference counter reaches zero free the device structure.
 501  * The function returns a NULL pointer to be used by the caller
 502  * for clearing reference pointers.
 503  */
 504 struct tape_device *
 505 tape_put_device(struct tape_device *device)
 506 {
 507         int remain;
 508
 509         remain = atomic_dec_return(&device->ref_count);
 510         if (remain > 0) {
 511                 DBF_EVENT(4, "tape_put_device(%p) -> %i\n", device, remain);
 512         } else {
 513                 if (remain < 0) {
 514                         DBF_EVENT(4, "put device without reference\n");
 515                         PRINT_ERR("put device without reference\n");
 516                 } else {
 517                         DBF_EVENT(4, "tape_free_device(%p)\n", device);
 518                         kfree(device->modeset_byte);
 519                         kfree(device);
 520                 }
 521         }
 522
 523         return NULL;
 524 }
 525
 526 /*
 527  * Find tape device by a device index.
 528  */
 529 struct tape_device *
 530 tape_get_device(int devindex)
 531 {
 532         struct tape_device *device, *tmp;
 533
 534         device = ERR_PTR(-ENODEV);
 535         read_lock(&tape_device_lock);
 536         list_for_each_entry(tmp, &tape_device_list, node) {
 537                 if (tmp->first_minor / TAPE_MINORS_PER_DEV == devindex) {
 538                         device = tape_get_device_reference(tmp);
 539                         break;
 540                 }
 541         }
 542         read_unlock(&tape_device_lock);
 543         return device;
 544 }
 545
 546 /*
 547  * Driverfs tape probe function.
 548  */
 549 int
 550 tape_generic_probe(struct ccw_device *cdev)
 551 {
 552         struct tape_device *device;
 553         int ret;
 554
 555         device = tape_alloc_device();
 556         if (IS_ERR(device))
 557                 return -ENODEV;
 558         ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP);
 559         ret = sysfs_create_group(&cdev->dev.kobj, &tape_attr_group);
 560         if (ret) {
 561                 tape_put_device(device);
 562                 PRINT_ERR("probe failed for tape device %s\n", cdev->dev.bus_id);
 563                 return ret;
 564         }
 565         cdev->dev.driver_data = device;
 566         cdev->handler = __tape_do_irq;
 567         device->cdev = cdev;
 568         device->cdev_id = busid_to_int(cdev->dev.bus_id);
 569         PRINT_INFO("tape device %s found\n", cdev->dev.bus_id);
 570         return ret;
 571 }
 572
 573 static void
 574 __tape_discard_requests(struct tape_device *device)
 575 {
 576         struct tape_request *   request;
 577         struct list_head *      l, *n;
 578
 579         list_for_each_safe(l, n, &device->req_queue) {
 580                 request = list_entry(l, struct tape_request, list);
 581                 if (request->status == TAPE_REQUEST_IN_IO)
 582                         request->status = TAPE_REQUEST_DONE;
 583                 list_del(&request->list);
 584
 585                 /* Decrease ref_count for removed request. */
 586                 request->device = tape_put_device(device);
 587                 request->rc = -EIO;
 588                 if (request->callback != NULL)
 589                         request->callback(request, request->callback_data);
 590         }
 591 }
 592
 593 /*
 594  * Driverfs tape remove function.
 595  *
 596  * This function is called whenever the common I/O layer detects the device
 597  * gone. This can happen at any time and we cannot refuse.
 598  */
 599 void
 600 tape_generic_remove(struct ccw_device *cdev)
 601 {
 602         struct tape_device *    device;
 603
 604         device = cdev->dev.driver_data;
 605         if (!device) {
 606                 PRINT_ERR("No device pointer in tape_generic_remove!\n");
 607                 return;
 608         }
 609         DBF_LH(3, "(%08x): tape_generic_remove(%p)\n", device->cdev_id, cdev);
 610
 611         spin_lock_irq(get_ccwdev_lock(device->cdev));
 612         switch (device->tape_state) {
 613                 case TS_INIT:
 614                         tape_state_set(device, TS_NOT_OPER);
 615                 case TS_NOT_OPER:
 616                         /*
 617                          * Nothing to do.
 618                          */
 619                         spin_unlock_irq(get_ccwdev_lock(device->cdev));
 620                         break;
 621                 case TS_UNUSED:
 622                         /*
 623                          * Need only to release the device.
 624                          */
 625                         tape_state_set(device, TS_NOT_OPER);
 626                         spin_unlock_irq(get_ccwdev_lock(device->cdev));
 627                         tape_cleanup_device(device);
 628                         break;
 629                 default:
 630                         /*
 631                          * There may be requests on the queue. We will not get
 632                          * an interrupt for a request that was running. So we
 633                          * just post them all as I/O errors.
 634                          */
 635                         DBF_EVENT(3, "(%08x): Drive in use vanished!\n",
 636                                 device->cdev_id);
 637                         PRINT_WARN("(%s): Drive in use vanished - "
 638                                 "expect trouble!\n",
 639                                 device->cdev->dev.bus_id);
 640                         PRINT_WARN("State was %i\n", device->tape_state);
 641                         tape_state_set(device, TS_NOT_OPER);
 642                         __tape_discard_requests(device);
 643                         spin_unlock_irq(get_ccwdev_lock(device->cdev));
 644                         tape_cleanup_device(device);
 645         }
 646
 647         if (cdev->dev.driver_data != NULL) {
 648                 sysfs_remove_group(&cdev->dev.kobj, &tape_attr_group);
 649                 cdev->dev.driver_data = tape_put_device(cdev->dev.driver_data);
 650         }
 651 }
 652
 653 /*
 654  * Allocate a new tape ccw request
 655  */
 656 struct tape_request *
 657 tape_alloc_request(int cplength, int datasize)
 658 {
 659         struct tape_request *request;
 660
 661         if (datasize > PAGE_SIZE || (cplength*sizeof(struct ccw1)) > PAGE_SIZE)
 662                 BUG();
 663
 664         DBF_LH(6, "tape_alloc_request(%d, %d)\n", cplength, datasize);
 665
 666         request = kzalloc(sizeof(struct tape_request), GFP_KERNEL);
 667         if (request == NULL) {
 668                 DBF_EXCEPTION(1, "cqra nomem\n");
 669                 return ERR_PTR(-ENOMEM);
 670         }
 671         /* allocate channel program */
 672         if (cplength > 0) {
 673                 request->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
 674                                           GFP_ATOMIC | GFP_DMA);
 675                 if (request->cpaddr == NULL) {
 676                         DBF_EXCEPTION(1, "cqra nomem\n");
 677                         kfree(request);
 678                         return ERR_PTR(-ENOMEM);
 679                 }
 680         }
 681         /* alloc small kernel buffer */
 682         if (datasize > 0) {
 683                 request->cpdata = kzalloc(datasize, GFP_KERNEL | GFP_DMA);
 684                 if (request->cpdata == NULL) {
 685                         DBF_EXCEPTION(1, "cqra nomem\n");
 686                         kfree(request->cpaddr);
 687                         kfree(request);
 688                         return ERR_PTR(-ENOMEM);
 689                 }
 690         }
 691         DBF_LH(6, "New request %p(%p/%p)\n", request, request->cpaddr,
 692                 request->cpdata);
 693
 694         return request;
 695 }
 696
 697 /*
 698  * Free tape ccw request
 699  */
 700 void
 701 tape_free_request (struct tape_request * request)
 702 {
 703         DBF_LH(6, "Free request %p\n", request);
 704
 705         if (request->device != NULL) {
 706                 request->device = tape_put_device(request->device);
 707         }
 708         kfree(request->cpdata);
 709         kfree(request->cpaddr);
 710         kfree(request);
 711 }
 712
 713 static int
 714 __tape_start_io(struct tape_device *device, struct tape_request *request)
 715 {
 716         int rc;
 717
 718 #ifdef CONFIG_S390_TAPE_BLOCK
 719         if (request->op == TO_BLOCK)
 720                 device->discipline->check_locate(device, request);
 721 #endif
 722         rc = ccw_device_start(
 723                 device->cdev,
 724                 request->cpaddr,
 725                 (unsigned long) request,
 726                 0x00,
 727                 request->options
 728         );
 729         if (rc == 0) {
 730                 request->status = TAPE_REQUEST_IN_IO;
 731         } else if (rc == -EBUSY) {
 732                 /* The common I/O subsystem is currently busy. Retry later. */
 733                 request->status = TAPE_REQUEST_QUEUED;
 734                 schedule_delayed_work(&device->tape_dnr, 0);
 735                 rc = 0;
 736         } else {
 737                 /* Start failed. Remove request and indicate failure. */
 738                 DBF_EVENT(1, "tape: start request failed with RC = %i\n", rc);
 739         }
 740         return rc;
 741 }
 742
 743 static void
 744 __tape_start_next_request(struct tape_device *device)
 745 {
 746         struct list_head *l, *n;
 747         struct tape_request *request;
 748         int rc;
 749
 750         DBF_LH(6, "__tape_start_next_request(%p)\n", device);
 751         /*
 752          * Try to start each request on request queue until one is
 753          * started successful.
 754          */
 755         list_for_each_safe(l, n, &device->req_queue) {
 756                 request = list_entry(l, struct tape_request, list);
 757
 758                 /*
 759                  * Avoid race condition if bottom-half was triggered more than
 760                  * once.
 761                  */
 762                 if (request->status == TAPE_REQUEST_IN_IO)
 763                         return;
 764                 /*
 765                  * Request has already been stopped. We have to wait until
 766                  * the request is removed from the queue in the interrupt
 767                  * handling.
 768                  */
 769                 if (request->status == TAPE_REQUEST_DONE)
 770                         return;
 771
 772                 /*
 773                  * We wanted to cancel the request but the common I/O layer
 774                  * was busy at that time. This can only happen if this
 775                  * function is called by delayed_next_request.
 776                  * Otherwise we start the next request on the queue.
 777                  */
 778                 if (request->status == TAPE_REQUEST_CANCEL) {
 779                         rc = __tape_cancel_io(device, request);
 780                 } else {
 781                         rc = __tape_start_io(device, request);
 782                 }
 783                 if (rc == 0)
 784                         return;
 785
 786                 /* Set ending status. */
 787                 request->rc = rc;
 788                 request->status = TAPE_REQUEST_DONE;
 789
 790                 /* Remove from request queue. */
 791                 list_del(&request->list);
 792
 793                 /* Do callback. */
 794                 if (request->callback != NULL)
 795                         request->callback(request, request->callback_data);
 796         }
 797 }
 798
 799 static void
 800 tape_delayed_next_request(struct work_struct *work)
 801 {
 802         struct tape_device *device =
 803                 container_of(work, struct tape_device, tape_dnr.work);
 804
 805         DBF_LH(6, "tape_delayed_next_request(%p)\n", device);
 806         spin_lock_irq(get_ccwdev_lock(device->cdev));
 807         __tape_start_next_request(device);
 808         spin_unlock_irq(get_ccwdev_lock(device->cdev));
 809 }
 810
 811 static void tape_long_busy_timeout(unsigned long data)
 812 {
 813         struct tape_request *request;
 814         struct tape_device *device;
 815
 816         device = (struct tape_device *) data;
 817         spin_lock_irq(get_ccwdev_lock(device->cdev));
 818         request = list_entry(device->req_queue.next, struct tape_request, list);
 819         if (request->status != TAPE_REQUEST_LONG_BUSY)
 820                 BUG();
 821         DBF_LH(6, "%08x: Long busy timeout.\n", device->cdev_id);
 822         __tape_start_next_request(device);
 823         device->lb_timeout.data = (unsigned long) tape_put_device(device);
 824         spin_unlock_irq(get_ccwdev_lock(device->cdev));
 825 }
 826
 827 static void
 828 __tape_end_request(
 829         struct tape_device *    device,
 830         struct tape_request *   request,
 831         int                     rc)
 832 {
 833         DBF_LH(6, "__tape_end_request(%p, %p, %i)\n", device, request, rc);
 834         if (request) {
 835                 request->rc = rc;
 836                 request->status = TAPE_REQUEST_DONE;
 837
 838                 /* Remove from request queue. */
 839                 list_del(&request->list);
 840
 841                 /* Do callback. */
 842                 if (request->callback != NULL)
 843                         request->callback(request, request->callback_data);
 844         }
 845
 846         /* Start next request. */
 847         if (!list_empty(&device->req_queue))
 848                 __tape_start_next_request(device);
 849 }
 850
 851 /*
 852  * Write sense data to console/dbf
 853  */
 854 void
 855 tape_dump_sense(struct tape_device* device, struct tape_request *request,
 856                 struct irb *irb)
 857 {
 858         unsigned int *sptr;
 859
 860         PRINT_INFO("-------------------------------------------------\n");
 861         PRINT_INFO("DSTAT : %02x  CSTAT: %02x   CPA: %04x\n",
 862                    irb->scsw.dstat, irb->scsw.cstat, irb->scsw.cpa);
 863         PRINT_INFO("DEVICE: %s\n", device->cdev->dev.bus_id);
 864         if (request != NULL)
 865                 PRINT_INFO("OP    : %s\n", tape_op_verbose[request->op]);
 866
 867         sptr = (unsigned int *) irb->ecw;
 868         PRINT_INFO("Sense data: %08X %08X %08X %08X \n",
 869                    sptr[0], sptr[1], sptr[2], sptr[3]);
 870         PRINT_INFO("Sense data: %08X %08X %08X %08X \n",
 871                    sptr[4], sptr[5], sptr[6], sptr[7]);
 872         PRINT_INFO("--------------------------------------------------\n");
 873 }
 874
 875 /*
 876  * Write sense data to dbf
 877  */
 878 void
 879 tape_dump_sense_dbf(struct tape_device *device, struct tape_request *request,
 880                     struct irb *irb)
 881 {
 882         unsigned int *sptr;
 883         const char* op;
 884
 885         if (request != NULL)
 886                 op = tape_op_verbose[request->op];
 887         else
 888                 op = "---";
 889         DBF_EVENT(3, "DSTAT : %02x   CSTAT: %02x\n",
 890                   irb->scsw.dstat,irb->scsw.cstat);
 891         DBF_EVENT(3, "DEVICE: %08x OP\t: %s\n", device->cdev_id, op);
 892         sptr = (unsigned int *) irb->ecw;
 893         DBF_EVENT(3, "%08x %08x\n", sptr[0], sptr[1]);
 894         DBF_EVENT(3, "%08x %08x\n", sptr[2], sptr[3]);
 895         DBF_EVENT(3, "%08x %08x\n", sptr[4], sptr[5]);
 896         DBF_EVENT(3, "%08x %08x\n", sptr[6], sptr[7]);
 897 }
 898
 899 /*
 900  * I/O helper function. Adds the request to the request queue
 901  * and starts it if the tape is idle. Has to be called with
 902  * the device lock held.
 903  */
 904 static int
 905 __tape_start_request(struct tape_device *device, struct tape_request *request)
 906 {
 907         int rc;
 908
 909         switch (request->op) {
 910                 case TO_MSEN:
 911                 case TO_ASSIGN:
 912                 case TO_UNASSIGN:
 913                 case TO_READ_ATTMSG:
 914                 case TO_RDC:
 915                         if (device->tape_state == TS_INIT)
 916                                 break;
 917                         if (device->tape_state == TS_UNUSED)
 918                                 break;
 919                 default:
 920                         if (device->tape_state == TS_BLKUSE)
 921                                 break;
 922                         if (device->tape_state != TS_IN_USE)
 923                                 return -ENODEV;
 924         }
 925
 926         /* Increase use count of device for the added request. */
 927         request->device = tape_get_device_reference(device);
 928
 929         if (list_empty(&device->req_queue)) {
 930                 /* No other requests are on the queue. Start this one. */
 931                 rc = __tape_start_io(device, request);
 932                 if (rc)
 933                         return rc;
 934
 935                 DBF_LH(5, "Request %p added for execution.\n", request);
 936                 list_add(&request->list, &device->req_queue);
 937         } else {
 938                 DBF_LH(5, "Request %p add to queue.\n", request);
 939                 request->status = TAPE_REQUEST_QUEUED;
 940                 list_add_tail(&request->list, &device->req_queue);
 941         }
 942         return 0;
 943 }
 944
 945 /*
 946  * Add the request to the request queue, try to start it if the
 947  * tape is idle. Return without waiting for end of i/o.
 948  */
 949 int
 950 tape_do_io_async(struct tape_device *device, struct tape_request *request)
 951 {
 952         int rc;
 953
 954         DBF_LH(6, "tape_do_io_async(%p, %p)\n", device, request);
 955
 956         spin_lock_irq(get_ccwdev_lock(device->cdev));
 957         /* Add request to request queue and try to start it. */
 958         rc = __tape_start_request(device, request);
 959         spin_unlock_irq(get_ccwdev_lock(device->cdev));
 960         return rc;
 961 }
 962
 963 /*
 964  * tape_do_io/__tape_wake_up
 965  * Add the request to the request queue, try to start it if the
 966  * tape is idle and wait uninterruptible for its completion.
 967  */
 968 static void
 969 __tape_wake_up(struct tape_request *request, void *data)
 970 {
 971         request->callback = NULL;
 972         wake_up((wait_queue_head_t *) data);
 973 }
 974
 975 int
 976 tape_do_io(struct tape_device *device, struct tape_request *request)
 977 {
 978         wait_queue_head_t wq;
 979         int rc;
 980
 981         init_waitqueue_head(&wq);
 982         spin_lock_irq(get_ccwdev_lock(device->cdev));
 983         /* Setup callback */
 984         request->callback = __tape_wake_up;
 985         request->callback_data = &wq;
 986         /* Add request to request queue and try to start it. */
 987         rc = __tape_start_request(device, request);
 988         spin_unlock_irq(get_ccwdev_lock(device->cdev));
 989         if (rc)
 990                 return rc;
 991         /* Request added to the queue. Wait for its completion. */
 992         wait_event(wq, (request->callback == NULL));
 993         /* Get rc from request */
 994         return request->rc;
 995 }
 996
 997 /*
 998  * tape_do_io_interruptible/__tape_wake_up_interruptible
 999  * Add the request to the request queue, try to start it if the
1000  * tape is idle and wait uninterruptible for its completion.
1001  */
1002 static void
1003 __tape_wake_up_interruptible(struct tape_request *request, void *data)
1004 {
1005         request->callback = NULL;
1006         wake_up_interruptible((wait_queue_head_t *) data);
1007 }
1008
1009 int
1010 tape_do_io_interruptible(struct tape_device *device,
1011                          struct tape_request *request)
1012 {
1013         wait_queue_head_t wq;
1014         int rc;
1015
1016         init_waitqueue_head(&wq);
1017         spin_lock_irq(get_ccwdev_lock(device->cdev));
1018         /* Setup callback */
1019         request->callback = __tape_wake_up_interruptible;
1020         request->callback_data = &wq;
1021         rc = __tape_start_request(device, request);
1022         spin_unlock_irq(get_ccwdev_lock(device->cdev));
1023         if (rc)
1024                 return rc;
1025         /* Request added to the queue. Wait for its completion. */
1026         rc = wait_event_interruptible(wq, (request->callback == NULL));
1027         if (rc != -ERESTARTSYS)
1028                 /* Request finished normally. */
1029                 return request->rc;
1030
1031         /* Interrupted by a signal. We have to stop the current request. */
1032         spin_lock_irq(get_ccwdev_lock(device->cdev));
1033         rc = __tape_cancel_io(device, request);
1034         spin_unlock_irq(get_ccwdev_lock(device->cdev));
1035         if (rc == 0) {
1036                 /* Wait for the interrupt that acknowledges the halt. */
1037                 do {
1038                         rc = wait_event_interruptible(
1039                                 wq,
1040                                 (request->callback == NULL)
1041                         );
1042                 } while (rc == -ERESTARTSYS);
1043
1044                 DBF_EVENT(3, "IO stopped on %08x\n", device->cdev_id);
1045                 rc = -ERESTARTSYS;
1046         }
1047         return rc;
1048 }
1049
1050 /*
1051  * Stop running ccw.
1052  */
1053 int
1054 tape_cancel_io(struct tape_device *device, struct tape_request *request)
1055 {
1056         int rc;
1057
1058         spin_lock_irq(get_ccwdev_lock(device->cdev));
1059         rc = __tape_cancel_io(device, request);
1060         spin_unlock_irq(get_ccwdev_lock(device->cdev));
1061         return rc;
1062 }
1063
1064 /*
1065  * Tape interrupt routine, called from the ccw_device layer
1066  */
1067 static void
1068 __tape_do_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1069 {
1070         struct tape_device *device;
1071         struct tape_request *request;
1072         int rc;
1073
1074         device = (struct tape_device *) cdev->dev.driver_data;
1075         if (device == NULL) {
1076                 PRINT_ERR("could not get device structure for %s "
1077                           "in interrupt\n", cdev->dev.bus_id);
1078                 return;
1079         }
1080         request = (struct tape_request *) intparm;
1081
1082         DBF_LH(6, "__tape_do_irq(device=%p, request=%p)\n", device, request);
1083
1084         /* On special conditions irb is an error pointer */
1085         if (IS_ERR(irb)) {
1086                 /* FIXME: What to do with the request? */
1087                 switch (PTR_ERR(irb)) {
1088                         case -ETIMEDOUT:
1089                                 PRINT_WARN("(%s): Request timed out\n",
1090                                         cdev->dev.bus_id);
1091                         case -EIO:
1092                                 __tape_end_request(device, request, -EIO);
1093                                 break;
1094                         default:
1095                                 PRINT_ERR("(%s): Unexpected i/o error %li\n",
1096                                         cdev->dev.bus_id,
1097                                         PTR_ERR(irb));
1098                 }
1099                 return;
1100         }
1101
1102         /*
1103          * If the condition code is not zero and the start function bit is
1104          * still set, this is an deferred error and the last start I/O did
1105          * not succeed. At this point the condition that caused the deferred
1106          * error might still apply. So we just schedule the request to be
1107          * started later.
1108          */
1109         if (irb->scsw.cc != 0 && (irb->scsw.fctl & SCSW_FCTL_START_FUNC) &&
1110             (request->status == TAPE_REQUEST_IN_IO)) {
1111                 DBF_EVENT(3,"(%08x): deferred cc=%i, fctl=%i. restarting\n",
1112                         device->cdev_id, irb->scsw.cc, irb->scsw.fctl);
1113                 request->status = TAPE_REQUEST_QUEUED;
1114                 schedule_delayed_work(&device->tape_dnr, HZ);
1115                 return;
1116         }
1117
1118         /* May be an unsolicited irq */
1119         if(request != NULL)
1120                 request->rescnt = irb->scsw.count;
1121         else if ((irb->scsw.dstat == 0x85 || irb->scsw.dstat == 0x80) &&
1122                  !list_empty(&device->req_queue)) {
1123                 /* Not Ready to Ready after long busy ? */
1124                 struct tape_request *req;
1125                 req = list_entry(device->req_queue.next,
1126                                  struct tape_request, list);
1127                 if (req->status == TAPE_REQUEST_LONG_BUSY) {
1128                         DBF_EVENT(3, "(%08x): del timer\n", device->cdev_id);
1129                         if (del_timer(&device->lb_timeout)) {
1130                                 device->lb_timeout.data = (unsigned long)
1131                                         tape_put_device(device);
1132                                 __tape_start_next_request(device);
1133                         }
1134                         return;
1135                 }
1136         }
1137         if (irb->scsw.dstat != 0x0c) {
1138                 /* Set the 'ONLINE' flag depending on sense byte 1 */
1139                 if(*(((__u8 *) irb->ecw) + 1) & SENSE_DRIVE_ONLINE)
1140                         device->tape_generic_status |= GMT_ONLINE(~0);
1141                 else
1142                         device->tape_generic_status &= ~GMT_ONLINE(~0);
1143
1144                 /*
1145                  * Any request that does not come back with channel end
1146                  * and device end is unusual. Log the sense data.
1147                  */
1148                 DBF_EVENT(3,"-- Tape Interrupthandler --\n");
1149                 tape_dump_sense_dbf(device, request, irb);
1150         } else {
1151                 /* Upon normal completion the device _is_ online */
1152                 device->tape_generic_status |= GMT_ONLINE(~0);
1153         }
1154         if (device->tape_state == TS_NOT_OPER) {
1155                 DBF_EVENT(6, "tape:device is not operational\n");
1156                 return;
1157         }
1158
1159         /*
1160          * Request that were canceled still come back with an interrupt.
1161          * To detect these request the state will be set to TAPE_REQUEST_DONE.
1162          */
1163         if(request != NULL && request->status == TAPE_REQUEST_DONE) {
1164                 __tape_end_request(device, request, -EIO);
1165                 return;
1166         }
1167
1168         rc = device->discipline->irq(device, request, irb);
1169         /*
1170          * rc < 0 : request finished unsuccessfully.
1171          * rc == TAPE_IO_SUCCESS: request finished successfully.
1172          * rc == TAPE_IO_PENDING: request is still running. Ignore rc.
1173          * rc == TAPE_IO_RETRY: request finished but needs another go.
1174          * rc == TAPE_IO_STOP: request needs to get terminated.
1175          */
1176         switch (rc) {
1177                 case TAPE_IO_SUCCESS:
1178                         /* Upon normal completion the device _is_ online */
1179                         device->tape_generic_status |= GMT_ONLINE(~0);
1180                         __tape_end_request(device, request, rc);
1181                         break;
1182                 case TAPE_IO_PENDING:
1183                         break;
1184                 case TAPE_IO_LONG_BUSY:
1185                         device->lb_timeout.data =
1186                                 (unsigned long)tape_get_device_reference(device);
1187                         device->lb_timeout.expires = jiffies +
1188                                 LONG_BUSY_TIMEOUT * HZ;
1189                         DBF_EVENT(3, "(%08x): add timer\n", device->cdev_id);
1190                         add_timer(&device->lb_timeout);
1191                         request->status = TAPE_REQUEST_LONG_BUSY;
1192                         break;
1193                 case TAPE_IO_RETRY:
1194                         rc = __tape_start_io(device, request);
1195                         if (rc)
1196                                 __tape_end_request(device, request, rc);
1197                         break;
1198                 case TAPE_IO_STOP:
1199                         rc = __tape_cancel_io(device, request);
1200                         if (rc)
1201                                 __tape_end_request(device, request, rc);
1202                         break;
1203                 default:
1204                         if (rc > 0) {
1205                                 DBF_EVENT(6, "xunknownrc\n");
1206                                 PRINT_ERR("Invalid return code from discipline "
1207                                         "interrupt function.\n");
1208                                 __tape_end_request(device, request, -EIO);
1209                         } else {
1210                                 __tape_end_request(device, request, rc);
1211                         }
1212                         break;
1213         }
1214 }
1215
1216 /*
1217  * Tape device open function used by tape_char & tape_block frontends.
1218  */
1219 int
1220 tape_open(struct tape_device *device)
1221 {
1222         int rc;
1223
1224         spin_lock(get_ccwdev_lock(device->cdev));
1225         if (device->tape_state == TS_NOT_OPER) {
1226                 DBF_EVENT(6, "TAPE:nodev\n");
1227                 rc = -ENODEV;
1228         } else if (device->tape_state == TS_IN_USE) {
1229                 DBF_EVENT(6, "TAPE:dbusy\n");
1230                 rc = -EBUSY;
1231         } else if (device->tape_state == TS_BLKUSE) {
1232                 DBF_EVENT(6, "TAPE:dbusy\n");
1233                 rc = -EBUSY;
1234         } else if (device->discipline != NULL &&
1235                    !try_module_get(device->discipline->owner)) {
1236                 DBF_EVENT(6, "TAPE:nodisc\n");
1237                 rc = -ENODEV;
1238         } else {
1239                 tape_state_set(device, TS_IN_USE);
1240                 rc = 0;
1241         }
1242         spin_unlock(get_ccwdev_lock(device->cdev));
1243         return rc;
1244 }
1245
1246 /*
1247  * Tape device release function used by tape_char & tape_block frontends.
1248  */
1249 int
1250 tape_release(struct tape_device *device)
1251 {
1252         spin_lock(get_ccwdev_lock(device->cdev));
1253         if (device->tape_state == TS_IN_USE)
1254                 tape_state_set(device, TS_UNUSED);
1255         module_put(device->discipline->owner);
1256         spin_unlock(get_ccwdev_lock(device->cdev));
1257         return 0;
1258 }
1259
1260 /*
1261  * Execute a magnetic tape command a number of times.
1262  */
1263 int
1264 tape_mtop(struct tape_device *device, int mt_op, int mt_count)
1265 {
1266         tape_mtop_fn fn;
1267         int rc;
1268
1269         DBF_EVENT(6, "TAPE:mtio\n");
1270         DBF_EVENT(6, "TAPE:ioop: %x\n", mt_op);
1271         DBF_EVENT(6, "TAPE:arg:  %x\n", mt_count);
1272
1273         if (mt_op < 0 || mt_op >= TAPE_NR_MTOPS)
1274                 return -EINVAL;
1275         fn = device->discipline->mtop_array[mt_op];
1276         if (fn == NULL)
1277                 return -EINVAL;
1278
1279         /* We assume that the backends can handle count up to 500. */
1280         if (mt_op == MTBSR  || mt_op == MTFSR  || mt_op == MTFSF  ||
1281             mt_op == MTBSF  || mt_op == MTFSFM || mt_op == MTBSFM) {
1282                 rc = 0;
1283                 for (; mt_count > 500; mt_count -= 500)
1284                         if ((rc = fn(device, 500)) != 0)
1285                                 break;
1286                 if (rc == 0)
1287                         rc = fn(device, mt_count);
1288         } else
1289                 rc = fn(device, mt_count);
1290         return rc;
1291
1292 }
1293
1294 /*
1295  * Tape init function.
1296  */
1297 static int
1298 tape_init (void)
1299 {
1300         TAPE_DBF_AREA = debug_register ( "tape", 2, 2, 4*sizeof(long));
1301         debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view);
1302 #ifdef DBF_LIKE_HELL
1303         debug_set_level(TAPE_DBF_AREA, 6);
1304 #endif
1305         DBF_EVENT(3, "tape init\n");
1306         tape_proc_init();
1307         tapechar_init ();
1308         tapeblock_init ();
1309         return 0;
1310 }
1311
1312 /*
1313  * Tape exit function.
1314  */
1315 static void
1316 tape_exit(void)
1317 {
1318         DBF_EVENT(6, "tape exit\n");
1319
1320         /* Get rid of the frontends */
1321         tapechar_exit();
1322         tapeblock_exit();
1323         tape_proc_cleanup();
1324         debug_unregister (TAPE_DBF_AREA);
1325 }
1326
1327 MODULE_AUTHOR("(C) 2001 IBM Deutschland Entwicklung GmbH by Carsten Otte and "
1328               "Michael Holzheu (cotte@de.ibm.com,holzheu@de.ibm.com)");
1329 MODULE_DESCRIPTION("Linux on zSeries channel attached tape device driver");
1330 MODULE_LICENSE("GPL");
1331
1332 module_init(tape_init);
1333 module_exit(tape_exit);
1334
1335 EXPORT_SYMBOL(tape_generic_remove);
1336 EXPORT_SYMBOL(tape_generic_probe);
1337 EXPORT_SYMBOL(tape_generic_online);
1338 EXPORT_SYMBOL(tape_generic_offline);
1339 EXPORT_SYMBOL(tape_put_device);
1340 EXPORT_SYMBOL(tape_get_device_reference);
1341 EXPORT_SYMBOL(tape_state_verbose);
1342 EXPORT_SYMBOL(tape_op_verbose);
1343 EXPORT_SYMBOL(tape_state_set);
1344 EXPORT_SYMBOL(tape_med_state_set);
1345 EXPORT_SYMBOL(tape_alloc_request);
1346 EXPORT_SYMBOL(tape_free_request);
1347 EXPORT_SYMBOL(tape_dump_sense);
1348 EXPORT_SYMBOL(tape_dump_sense_dbf);
1349 EXPORT_SYMBOL(tape_do_io);
1350 EXPORT_SYMBOL(tape_do_io_async);
1351 EXPORT_SYMBOL(tape_do_io_interruptible);
1352 EXPORT_SYMBOL(tape_cancel_io);
1353 EXPORT_SYMBOL(tape_mtop);