Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/s390/char/tape_core.c |
| 3 | * basic function of the tape device driver |
| 4 | * |
| 5 | * S390 and zSeries version |
Michael Holzheu | cced1dd | 2007-02-05 21:18:26 +0100 | [diff] [blame] | 6 | * Copyright IBM Corp. 2001,2006 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 11 | * Stefan Bader <shbader@de.ibm.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | */ |
| 13 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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: " |
Michael Holzheu | cced1dd | 2007-02-05 21:18:26 +0100 | [diff] [blame] | 29 | #define LONG_BUSY_TIMEOUT 180 /* seconds */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
| 31 | static void __tape_do_irq (struct ccw_device *, unsigned long, struct irb *); |
Martin Schwidefsky | c163753 | 2006-12-08 15:53:57 +0100 | [diff] [blame] | 32 | static void tape_delayed_next_request(struct work_struct *); |
Michael Holzheu | cced1dd | 2007-02-05 21:18:26 +0100 | [diff] [blame] | 33 | static void tape_long_busy_timeout(unsigned long data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Denis Cheng | c11ca97 | 2008-01-26 14:11:13 +0100 | [diff] [blame] | 40 | static LIST_HEAD(tape_device_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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", |
Michael Holzheu | cced1dd | 2007-02-05 21:18:26 +0100 | [diff] [blame] | 74 | [TO_UNASSIGN] = "UAS", [TO_CRYPT_ON] = "CON", |
| 75 | [TO_CRYPT_OFF] = "COF", [TO_KEKL_SET] = "KLS", |
Michael Holzheu | e296306 | 2007-05-04 18:47:53 +0200 | [diff] [blame] | 76 | [TO_KEKL_QUERY] = "KLQ",[TO_RDC] = "RDC", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | }; |
| 78 | |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 79 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 114 | tape_medium_state_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 126 | tape_first_minor_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 138 | tape_state_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 151 | tape_operation_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 178 | tape_blocksize_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Peter Oberparleiter | f976069 | 2006-04-10 22:53:49 -0700 | [diff] [blame] | 216 | DBF_EVENT(4, "old ts:\t\n"); |
| 217 | if (device->tape_state < TS_SIZE && device->tape_state >=0 ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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"); |
Peter Oberparleiter | f976069 | 2006-04-10 22:53:49 -0700 | [diff] [blame] | 223 | if (newstate < TS_SIZE && newstate >= 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 259 | static int |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 260 | __tape_cancel_io(struct tape_device *device, struct tape_request *request) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 273 | switch (rc) { |
| 274 | case 0: |
| 275 | request->status = TAPE_REQUEST_DONE; |
| 276 | return 0; |
| 277 | case -EBUSY: |
| 278 | request->status = TAPE_REQUEST_CANCEL; |
Martin Schwidefsky | c163753 | 2006-12-08 15:53:57 +0100 | [diff] [blame] | 279 | schedule_delayed_work(&device->tape_dnr, 0); |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 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(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Michael Holzheu | cced1dd | 2007-02-05 21:18:26 +0100 | [diff] [blame] | 353 | init_timer(&device->lb_timeout); |
| 354 | device->lb_timeout.function = tape_long_busy_timeout; |
| 355 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 395 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Eric Sesterhenn | 88abaab | 2006-03-24 03:15:31 -0800 | [diff] [blame] | 458 | device = kzalloc(sizeof(struct tape_device), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Eric Sesterhenn | 88abaab | 2006-03-24 03:15:31 -0800 | [diff] [blame] | 465 | device->modeset_byte = kmalloc(1, GFP_KERNEL | GFP_DMA); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Martin Schwidefsky | c163753 | 2006-12-08 15:53:57 +0100 | [diff] [blame] | 480 | INIT_DELAYED_WORK(&device->tape_dnr, tape_delayed_next_request); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Heiko Carstens | d7cf0d5 | 2006-07-18 13:46:58 +0200 | [diff] [blame] | 553 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | |
| 555 | device = tape_alloc_device(); |
| 556 | if (IS_ERR(device)) |
| 557 | return -ENODEV; |
Heiko Carstens | d7cf0d5 | 2006-07-18 13:46:58 +0200 | [diff] [blame] | 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 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | cdev->dev.driver_data = device; |
Heiko Carstens | d7cf0d5 | 2006-07-18 13:46:58 +0200 | [diff] [blame] | 566 | cdev->handler = __tape_do_irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | device->cdev = cdev; |
| 568 | device->cdev_id = busid_to_int(cdev->dev.bus_id); |
Heiko Carstens | d7cf0d5 | 2006-07-18 13:46:58 +0200 | [diff] [blame] | 569 | PRINT_INFO("tape device %s found\n", cdev->dev.bus_id); |
| 570 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | } |
| 572 | |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 573 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Eric Sesterhenn | 88abaab | 2006-03-24 03:15:31 -0800 | [diff] [blame] | 666 | request = kzalloc(sizeof(struct tape_request), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | if (request == NULL) { |
| 668 | DBF_EXCEPTION(1, "cqra nomem\n"); |
| 669 | return ERR_PTR(-ENOMEM); |
| 670 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | /* allocate channel program */ |
| 672 | if (cplength > 0) { |
Eric Sesterhenn | 88abaab | 2006-03-24 03:15:31 -0800 | [diff] [blame] | 673 | request->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | } |
| 681 | /* alloc small kernel buffer */ |
| 682 | if (datasize > 0) { |
Eric Sesterhenn | 88abaab | 2006-03-24 03:15:31 -0800 | [diff] [blame] | 683 | request->cpdata = kzalloc(datasize, GFP_KERNEL | GFP_DMA); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | if (request->cpdata == NULL) { |
| 685 | DBF_EXCEPTION(1, "cqra nomem\n"); |
Jesper Juhl | 17fd682 | 2005-11-07 01:01:30 -0800 | [diff] [blame] | 686 | kfree(request->cpaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | kfree(request); |
| 688 | return ERR_PTR(-ENOMEM); |
| 689 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Jesper Juhl | 17fd682 | 2005-11-07 01:01:30 -0800 | [diff] [blame] | 708 | kfree(request->cpdata); |
| 709 | kfree(request->cpaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | kfree(request); |
| 711 | } |
| 712 | |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 713 | static int |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 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; |
Martin Schwidefsky | c163753 | 2006-12-08 15:53:57 +0100 | [diff] [blame] | 734 | schedule_delayed_work(&device->tape_dnr, 0); |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 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 | |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 743 | static void |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 744 | __tape_start_next_request(struct tape_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | { |
| 746 | struct list_head *l, *n; |
| 747 | struct tape_request *request; |
| 748 | int rc; |
| 749 | |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 750 | DBF_LH(6, "__tape_start_next_request(%p)\n", device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 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; |
Michael Holzheu | 5f38433 | 2006-03-24 03:15:28 -0800 | [diff] [blame] | 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; |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 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. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | request->rc = rc; |
| 788 | request->status = TAPE_REQUEST_DONE; |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | } |
| 797 | } |
| 798 | |
| 799 | static void |
Martin Schwidefsky | c163753 | 2006-12-08 15:53:57 +0100 | [diff] [blame] | 800 | tape_delayed_next_request(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | { |
Martin Schwidefsky | c163753 | 2006-12-08 15:53:57 +0100 | [diff] [blame] | 802 | struct tape_device *device = |
| 803 | container_of(work, struct tape_device, tape_dnr.work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 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 | |
Michael Holzheu | cced1dd | 2007-02-05 21:18:26 +0100 | [diff] [blame] | 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 | |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 827 | static void |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 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 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | |
| 846 | /* Start next request. */ |
| 847 | if (!list_empty(&device->req_queue)) |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 848 | __tape_start_next_request(device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 904 | static int |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 905 | __tape_start_request(struct tape_device *device, struct tape_request *request) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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: |
Michael Holzheu | e296306 | 2007-05-04 18:47:53 +0200 | [diff] [blame] | 914 | case TO_RDC: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. */ |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 931 | rc = __tape_start_io(device, request); |
| 932 | if (rc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | return rc; |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 934 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | DBF_LH(5, "Request %p added for execution.\n", request); |
| 936 | list_add(&request->list, &device->req_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | } else { |
| 938 | DBF_LH(5, "Request %p add to queue.\n", request); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | request->status = TAPE_REQUEST_QUEUED; |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 940 | list_add_tail(&request->list, &device->req_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. */ |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 958 | rc = __tape_start_request(device, request); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. */ |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 987 | rc = __tape_start_request(device, request); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 1021 | rc = __tape_start_request(device, request); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 1030 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | /* Interrupted by a signal. We have to stop the current request. */ |
| 1032 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 1033 | rc = __tape_cancel_io(device, request); |
| 1034 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | if (rc == 0) { |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 1036 | /* Wait for the interrupt that acknowledges the halt. */ |
| 1037 | do { |
| 1038 | rc = wait_event_interruptible( |
| 1039 | wq, |
| 1040 | (request->callback == NULL) |
| 1041 | ); |
Michael Holzheu | 4cd190a | 2006-03-24 03:15:27 -0800 | [diff] [blame] | 1042 | } while (rc == -ERESTARTSYS); |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 1043 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | DBF_EVENT(3, "IO stopped on %08x\n", device->cdev_id); |
| 1045 | rc = -ERESTARTSYS; |
| 1046 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | return rc; |
| 1048 | } |
| 1049 | |
| 1050 | /* |
Michael Holzheu | 5f38433 | 2006-03-24 03:15:28 -0800 | [diff] [blame] | 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 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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)) { |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 1086 | /* FIXME: What to do with the request? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | switch (PTR_ERR(irb)) { |
| 1088 | case -ETIMEDOUT: |
| 1089 | PRINT_WARN("(%s): Request timed out\n", |
| 1090 | cdev->dev.bus_id); |
| 1091 | case -EIO: |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 1092 | __tape_end_request(device, request, -EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 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 |
Stefan Bader | 842d3fb | 2006-03-24 03:15:26 -0800 | [diff] [blame] | 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. |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 1108 | */ |
Michael Holzheu | 5f38433 | 2006-03-24 03:15:28 -0800 | [diff] [blame] | 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); |
Stefan Bader | 842d3fb | 2006-03-24 03:15:26 -0800 | [diff] [blame] | 1113 | request->status = TAPE_REQUEST_QUEUED; |
Michael Holzheu | 5f38433 | 2006-03-24 03:15:28 -0800 | [diff] [blame] | 1114 | schedule_delayed_work(&device->tape_dnr, HZ); |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 1115 | return; |
| 1116 | } |
| 1117 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | /* May be an unsolicited irq */ |
| 1119 | if(request != NULL) |
| 1120 | request->rescnt = irb->scsw.count; |
Michael Holzheu | cced1dd | 2007-02-05 21:18:26 +0100 | [diff] [blame] | 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 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) { |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 1164 | __tape_end_request(device, request, -EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | switch (rc) { |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 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; |
Michael Holzheu | cced1dd | 2007-02-05 21:18:26 +0100 | [diff] [blame] | 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; |
Stefan Bader | 4111796 | 2005-07-27 11:45:04 -0700 | [diff] [blame] | 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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | { |
Michael Holzheu | 66a464d | 2005-06-25 14:55:33 -0700 | [diff] [blame] | 1300 | TAPE_DBF_AREA = debug_register ( "tape", 2, 2, 4*sizeof(long)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Heiko Carstens | e018ba1 | 2006-02-01 03:06:31 -0800 | [diff] [blame] | 1305 | DBF_EVENT(3, "tape init\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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)"); |
Heiko Carstens | e018ba1 | 2006-02-01 03:06:31 -0800 | [diff] [blame] | 1329 | MODULE_DESCRIPTION("Linux on zSeries channel attached tape device driver"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Michael Holzheu | 5f38433 | 2006-03-24 03:15:28 -0800 | [diff] [blame] | 1352 | EXPORT_SYMBOL(tape_cancel_io); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | EXPORT_SYMBOL(tape_mtop); |