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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/s390/char/tape_core.c | |
3 | * basic function of the tape device driver | |
4 | * | |
5 | * S390 and zSeries version | |
6 | * Copyright (C) 2001,2002 IBM Deutschland Entwicklung GmbH, IBM Corporation | |
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 | */ | |
12 | ||
13 | #include <linux/config.h> | |
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 | ||
30 | static void __tape_do_irq (struct ccw_device *, unsigned long, struct irb *); | |
31 | static void __tape_remove_request(struct tape_device *, struct tape_request *); | |
32 | ||
33 | /* | |
34 | * One list to contain all tape devices of all disciplines, so | |
35 | * we can assign the devices to minor numbers of the same major | |
36 | * The list is protected by the rwlock | |
37 | */ | |
38 | static struct list_head tape_device_list = LIST_HEAD_INIT(tape_device_list); | |
39 | static DEFINE_RWLOCK(tape_device_lock); | |
40 | ||
41 | /* | |
42 | * Pointer to debug area. | |
43 | */ | |
44 | debug_info_t *TAPE_DBF_AREA = NULL; | |
45 | EXPORT_SYMBOL(TAPE_DBF_AREA); | |
46 | ||
47 | /* | |
48 | * Printable strings for tape enumerations. | |
49 | */ | |
50 | const char *tape_state_verbose[TS_SIZE] = | |
51 | { | |
52 | [TS_UNUSED] = "UNUSED", | |
53 | [TS_IN_USE] = "IN_USE", | |
54 | [TS_BLKUSE] = "BLKUSE", | |
55 | [TS_INIT] = "INIT ", | |
56 | [TS_NOT_OPER] = "NOT_OP" | |
57 | }; | |
58 | ||
59 | const char *tape_op_verbose[TO_SIZE] = | |
60 | { | |
61 | [TO_BLOCK] = "BLK", [TO_BSB] = "BSB", | |
62 | [TO_BSF] = "BSF", [TO_DSE] = "DSE", | |
63 | [TO_FSB] = "FSB", [TO_FSF] = "FSF", | |
64 | [TO_LBL] = "LBL", [TO_NOP] = "NOP", | |
65 | [TO_RBA] = "RBA", [TO_RBI] = "RBI", | |
66 | [TO_RFO] = "RFO", [TO_REW] = "REW", | |
67 | [TO_RUN] = "RUN", [TO_WRI] = "WRI", | |
68 | [TO_WTM] = "WTM", [TO_MSEN] = "MSN", | |
69 | [TO_LOAD] = "LOA", [TO_READ_CONFIG] = "RCF", | |
70 | [TO_READ_ATTMSG] = "RAT", | |
71 | [TO_DIS] = "DIS", [TO_ASSIGN] = "ASS", | |
72 | [TO_UNASSIGN] = "UAS" | |
73 | }; | |
74 | ||
75 | static inline int | |
76 | busid_to_int(char *bus_id) | |
77 | { | |
78 | int dec; | |
79 | int d; | |
80 | char * s; | |
81 | ||
82 | for(s = bus_id, d = 0; *s != '\0' && *s != '.'; s++) | |
83 | d = (d * 10) + (*s - '0'); | |
84 | dec = d; | |
85 | for(s++, d = 0; *s != '\0' && *s != '.'; s++) | |
86 | d = (d * 10) + (*s - '0'); | |
87 | dec = (dec << 8) + d; | |
88 | ||
89 | for(s++; *s != '\0'; s++) { | |
90 | if (*s >= '0' && *s <= '9') { | |
91 | d = *s - '0'; | |
92 | } else if (*s >= 'a' && *s <= 'f') { | |
93 | d = *s - 'a' + 10; | |
94 | } else { | |
95 | d = *s - 'A' + 10; | |
96 | } | |
97 | dec = (dec << 4) + d; | |
98 | } | |
99 | ||
100 | return dec; | |
101 | } | |
102 | ||
103 | /* | |
104 | * Some channel attached tape specific attributes. | |
105 | * | |
106 | * FIXME: In the future the first_minor and blocksize attribute should be | |
107 | * replaced by a link to the cdev tree. | |
108 | */ | |
109 | static ssize_t | |
110 | tape_medium_state_show(struct device *dev, char *buf) | |
111 | { | |
112 | struct tape_device *tdev; | |
113 | ||
114 | tdev = (struct tape_device *) dev->driver_data; | |
115 | return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->medium_state); | |
116 | } | |
117 | ||
118 | static | |
119 | DEVICE_ATTR(medium_state, 0444, tape_medium_state_show, NULL); | |
120 | ||
121 | static ssize_t | |
122 | tape_first_minor_show(struct device *dev, char *buf) | |
123 | { | |
124 | struct tape_device *tdev; | |
125 | ||
126 | tdev = (struct tape_device *) dev->driver_data; | |
127 | return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->first_minor); | |
128 | } | |
129 | ||
130 | static | |
131 | DEVICE_ATTR(first_minor, 0444, tape_first_minor_show, NULL); | |
132 | ||
133 | static ssize_t | |
134 | tape_state_show(struct device *dev, char *buf) | |
135 | { | |
136 | struct tape_device *tdev; | |
137 | ||
138 | tdev = (struct tape_device *) dev->driver_data; | |
139 | return scnprintf(buf, PAGE_SIZE, "%s\n", (tdev->first_minor < 0) ? | |
140 | "OFFLINE" : tape_state_verbose[tdev->tape_state]); | |
141 | } | |
142 | ||
143 | static | |
144 | DEVICE_ATTR(state, 0444, tape_state_show, NULL); | |
145 | ||
146 | static ssize_t | |
147 | tape_operation_show(struct device *dev, char *buf) | |
148 | { | |
149 | struct tape_device *tdev; | |
150 | ssize_t rc; | |
151 | ||
152 | tdev = (struct tape_device *) dev->driver_data; | |
153 | if (tdev->first_minor < 0) | |
154 | return scnprintf(buf, PAGE_SIZE, "N/A\n"); | |
155 | ||
156 | spin_lock_irq(get_ccwdev_lock(tdev->cdev)); | |
157 | if (list_empty(&tdev->req_queue)) | |
158 | rc = scnprintf(buf, PAGE_SIZE, "---\n"); | |
159 | else { | |
160 | struct tape_request *req; | |
161 | ||
162 | req = list_entry(tdev->req_queue.next, struct tape_request, | |
163 | list); | |
164 | rc = scnprintf(buf,PAGE_SIZE, "%s\n", tape_op_verbose[req->op]); | |
165 | } | |
166 | spin_unlock_irq(get_ccwdev_lock(tdev->cdev)); | |
167 | return rc; | |
168 | } | |
169 | ||
170 | static | |
171 | DEVICE_ATTR(operation, 0444, tape_operation_show, NULL); | |
172 | ||
173 | static ssize_t | |
174 | tape_blocksize_show(struct device *dev, char *buf) | |
175 | { | |
176 | struct tape_device *tdev; | |
177 | ||
178 | tdev = (struct tape_device *) dev->driver_data; | |
179 | ||
180 | return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->char_data.block_size); | |
181 | } | |
182 | ||
183 | static | |
184 | DEVICE_ATTR(blocksize, 0444, tape_blocksize_show, NULL); | |
185 | ||
186 | static struct attribute *tape_attrs[] = { | |
187 | &dev_attr_medium_state.attr, | |
188 | &dev_attr_first_minor.attr, | |
189 | &dev_attr_state.attr, | |
190 | &dev_attr_operation.attr, | |
191 | &dev_attr_blocksize.attr, | |
192 | NULL | |
193 | }; | |
194 | ||
195 | static struct attribute_group tape_attr_group = { | |
196 | .attrs = tape_attrs, | |
197 | }; | |
198 | ||
199 | /* | |
200 | * Tape state functions | |
201 | */ | |
202 | void | |
203 | tape_state_set(struct tape_device *device, enum tape_state newstate) | |
204 | { | |
205 | const char *str; | |
206 | ||
207 | if (device->tape_state == TS_NOT_OPER) { | |
208 | DBF_EVENT(3, "ts_set err: not oper\n"); | |
209 | return; | |
210 | } | |
211 | DBF_EVENT(4, "ts. dev: %x\n", device->first_minor); | |
212 | if (device->tape_state < TO_SIZE && device->tape_state >= 0) | |
213 | str = tape_state_verbose[device->tape_state]; | |
214 | else | |
215 | str = "UNKNOWN TS"; | |
216 | DBF_EVENT(4, "old ts: %s\n", str); | |
217 | if (device->tape_state < TO_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 < TO_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 inline int | |
260 | __tape_halt_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 | if (rc == 0) { /* Termination successful */ | |
274 | request->rc = -EIO; | |
275 | request->status = TAPE_REQUEST_DONE; | |
276 | return 0; | |
277 | } | |
278 | ||
279 | if (rc == -ENODEV) | |
280 | DBF_EXCEPTION(2, "device gone, retry\n"); | |
281 | else if (rc == -EIO) | |
282 | DBF_EXCEPTION(2, "I/O error, retry\n"); | |
283 | else if (rc == -EBUSY) | |
284 | DBF_EXCEPTION(2, "device busy, retry late\n"); | |
285 | else | |
286 | BUG(); | |
287 | } | |
288 | ||
289 | return rc; | |
290 | } | |
291 | ||
292 | /* | |
293 | * Add device into the sorted list, giving it the first | |
294 | * available minor number. | |
295 | */ | |
296 | static int | |
297 | tape_assign_minor(struct tape_device *device) | |
298 | { | |
299 | struct tape_device *tmp; | |
300 | int minor; | |
301 | ||
302 | minor = 0; | |
303 | write_lock(&tape_device_lock); | |
304 | list_for_each_entry(tmp, &tape_device_list, node) { | |
305 | if (minor < tmp->first_minor) | |
306 | break; | |
307 | minor += TAPE_MINORS_PER_DEV; | |
308 | } | |
309 | if (minor >= 256) { | |
310 | write_unlock(&tape_device_lock); | |
311 | return -ENODEV; | |
312 | } | |
313 | device->first_minor = minor; | |
314 | list_add_tail(&device->node, &tmp->node); | |
315 | write_unlock(&tape_device_lock); | |
316 | return 0; | |
317 | } | |
318 | ||
319 | /* remove device from the list */ | |
320 | static void | |
321 | tape_remove_minor(struct tape_device *device) | |
322 | { | |
323 | write_lock(&tape_device_lock); | |
324 | list_del_init(&device->node); | |
325 | device->first_minor = -1; | |
326 | write_unlock(&tape_device_lock); | |
327 | } | |
328 | ||
329 | /* | |
330 | * Set a device online. | |
331 | * | |
332 | * This function is called by the common I/O layer to move a device from the | |
333 | * detected but offline into the online state. | |
334 | * If we return an error (RC < 0) the device remains in the offline state. This | |
335 | * can happen if the device is assigned somewhere else, for example. | |
336 | */ | |
337 | int | |
338 | tape_generic_online(struct tape_device *device, | |
339 | struct tape_discipline *discipline) | |
340 | { | |
341 | int rc; | |
342 | ||
343 | DBF_LH(6, "tape_enable_device(%p, %p)\n", device, discipline); | |
344 | ||
345 | if (device->tape_state != TS_INIT) { | |
346 | DBF_LH(3, "Tapestate not INIT (%d)\n", device->tape_state); | |
347 | return -EINVAL; | |
348 | } | |
349 | ||
350 | /* Let the discipline have a go at the device. */ | |
351 | device->discipline = discipline; | |
352 | if (!try_module_get(discipline->owner)) { | |
353 | PRINT_ERR("Cannot get module. Module gone.\n"); | |
354 | return -EINVAL; | |
355 | } | |
356 | ||
357 | rc = discipline->setup_device(device); | |
358 | if (rc) | |
359 | goto out; | |
360 | rc = tape_assign_minor(device); | |
361 | if (rc) | |
362 | goto out_discipline; | |
363 | ||
364 | rc = tapechar_setup_device(device); | |
365 | if (rc) | |
366 | goto out_minor; | |
367 | rc = tapeblock_setup_device(device); | |
368 | if (rc) | |
369 | goto out_char; | |
370 | ||
371 | tape_state_set(device, TS_UNUSED); | |
372 | ||
373 | DBF_LH(3, "(%08x): Drive set online\n", device->cdev_id); | |
374 | ||
375 | return 0; | |
376 | ||
377 | out_char: | |
378 | tapechar_cleanup_device(device); | |
379 | out_discipline: | |
380 | device->discipline->cleanup_device(device); | |
381 | device->discipline = NULL; | |
382 | out_minor: | |
383 | tape_remove_minor(device); | |
384 | out: | |
385 | module_put(discipline->owner); | |
386 | return rc; | |
387 | } | |
388 | ||
389 | static inline void | |
390 | tape_cleanup_device(struct tape_device *device) | |
391 | { | |
392 | tapeblock_cleanup_device(device); | |
393 | tapechar_cleanup_device(device); | |
394 | device->discipline->cleanup_device(device); | |
395 | module_put(device->discipline->owner); | |
396 | tape_remove_minor(device); | |
397 | tape_med_state_set(device, MS_UNKNOWN); | |
398 | } | |
399 | ||
400 | /* | |
401 | * Set device offline. | |
402 | * | |
403 | * Called by the common I/O layer if the drive should set offline on user | |
404 | * request. We may prevent this by returning an error. | |
405 | * Manual offline is only allowed while the drive is not in use. | |
406 | */ | |
407 | int | |
408 | tape_generic_offline(struct tape_device *device) | |
409 | { | |
410 | if (!device) { | |
411 | PRINT_ERR("tape_generic_offline: no such device\n"); | |
412 | return -ENODEV; | |
413 | } | |
414 | ||
415 | DBF_LH(3, "(%08x): tape_generic_offline(%p)\n", | |
416 | device->cdev_id, device); | |
417 | ||
418 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
419 | switch (device->tape_state) { | |
420 | case TS_INIT: | |
421 | case TS_NOT_OPER: | |
422 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
423 | break; | |
424 | case TS_UNUSED: | |
425 | tape_state_set(device, TS_INIT); | |
426 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
427 | tape_cleanup_device(device); | |
428 | break; | |
429 | default: | |
430 | DBF_EVENT(3, "(%08x): Set offline failed " | |
431 | "- drive in use.\n", | |
432 | device->cdev_id); | |
433 | PRINT_WARN("(%s): Set offline failed " | |
434 | "- drive in use.\n", | |
435 | device->cdev->dev.bus_id); | |
436 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
437 | return -EBUSY; | |
438 | } | |
439 | ||
440 | DBF_LH(3, "(%08x): Drive set offline.\n", device->cdev_id); | |
441 | return 0; | |
442 | } | |
443 | ||
444 | /* | |
445 | * Allocate memory for a new device structure. | |
446 | */ | |
447 | static struct tape_device * | |
448 | tape_alloc_device(void) | |
449 | { | |
450 | struct tape_device *device; | |
451 | ||
452 | device = (struct tape_device *) | |
453 | kmalloc(sizeof(struct tape_device), GFP_KERNEL); | |
454 | if (device == NULL) { | |
455 | DBF_EXCEPTION(2, "ti:no mem\n"); | |
456 | PRINT_INFO ("can't allocate memory for " | |
457 | "tape info structure\n"); | |
458 | return ERR_PTR(-ENOMEM); | |
459 | } | |
460 | memset(device, 0, sizeof(struct tape_device)); | |
461 | device->modeset_byte = (char *) kmalloc(1, GFP_KERNEL | GFP_DMA); | |
462 | if (device->modeset_byte == NULL) { | |
463 | DBF_EXCEPTION(2, "ti:no mem\n"); | |
464 | PRINT_INFO("can't allocate memory for modeset byte\n"); | |
465 | kfree(device); | |
466 | return ERR_PTR(-ENOMEM); | |
467 | } | |
468 | INIT_LIST_HEAD(&device->req_queue); | |
469 | INIT_LIST_HEAD(&device->node); | |
470 | init_waitqueue_head(&device->state_change_wq); | |
471 | device->tape_state = TS_INIT; | |
472 | device->medium_state = MS_UNKNOWN; | |
473 | *device->modeset_byte = 0; | |
474 | device->first_minor = -1; | |
475 | atomic_set(&device->ref_count, 1); | |
476 | ||
477 | return device; | |
478 | } | |
479 | ||
480 | /* | |
481 | * Get a reference to an existing device structure. This will automatically | |
482 | * increment the reference count. | |
483 | */ | |
484 | struct tape_device * | |
485 | tape_get_device_reference(struct tape_device *device) | |
486 | { | |
487 | DBF_EVENT(4, "tape_get_device_reference(%p) = %i\n", device, | |
488 | atomic_inc_return(&device->ref_count)); | |
489 | ||
490 | return device; | |
491 | } | |
492 | ||
493 | /* | |
494 | * Decrease the reference counter of a devices structure. If the | |
495 | * reference counter reaches zero free the device structure. | |
496 | * The function returns a NULL pointer to be used by the caller | |
497 | * for clearing reference pointers. | |
498 | */ | |
499 | struct tape_device * | |
500 | tape_put_device(struct tape_device *device) | |
501 | { | |
502 | int remain; | |
503 | ||
504 | remain = atomic_dec_return(&device->ref_count); | |
505 | if (remain > 0) { | |
506 | DBF_EVENT(4, "tape_put_device(%p) -> %i\n", device, remain); | |
507 | } else { | |
508 | if (remain < 0) { | |
509 | DBF_EVENT(4, "put device without reference\n"); | |
510 | PRINT_ERR("put device without reference\n"); | |
511 | } else { | |
512 | DBF_EVENT(4, "tape_free_device(%p)\n", device); | |
513 | kfree(device->modeset_byte); | |
514 | kfree(device); | |
515 | } | |
516 | } | |
517 | ||
518 | return NULL; | |
519 | } | |
520 | ||
521 | /* | |
522 | * Find tape device by a device index. | |
523 | */ | |
524 | struct tape_device * | |
525 | tape_get_device(int devindex) | |
526 | { | |
527 | struct tape_device *device, *tmp; | |
528 | ||
529 | device = ERR_PTR(-ENODEV); | |
530 | read_lock(&tape_device_lock); | |
531 | list_for_each_entry(tmp, &tape_device_list, node) { | |
532 | if (tmp->first_minor / TAPE_MINORS_PER_DEV == devindex) { | |
533 | device = tape_get_device_reference(tmp); | |
534 | break; | |
535 | } | |
536 | } | |
537 | read_unlock(&tape_device_lock); | |
538 | return device; | |
539 | } | |
540 | ||
541 | /* | |
542 | * Driverfs tape probe function. | |
543 | */ | |
544 | int | |
545 | tape_generic_probe(struct ccw_device *cdev) | |
546 | { | |
547 | struct tape_device *device; | |
548 | ||
549 | device = tape_alloc_device(); | |
550 | if (IS_ERR(device)) | |
551 | return -ENODEV; | |
552 | PRINT_INFO("tape device %s found\n", cdev->dev.bus_id); | |
553 | cdev->dev.driver_data = device; | |
554 | device->cdev = cdev; | |
555 | device->cdev_id = busid_to_int(cdev->dev.bus_id); | |
556 | cdev->handler = __tape_do_irq; | |
557 | ||
558 | ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP); | |
559 | sysfs_create_group(&cdev->dev.kobj, &tape_attr_group); | |
560 | ||
561 | return 0; | |
562 | } | |
563 | ||
564 | static inline void | |
565 | __tape_discard_requests(struct tape_device *device) | |
566 | { | |
567 | struct tape_request * request; | |
568 | struct list_head * l, *n; | |
569 | ||
570 | list_for_each_safe(l, n, &device->req_queue) { | |
571 | request = list_entry(l, struct tape_request, list); | |
572 | if (request->status == TAPE_REQUEST_IN_IO) | |
573 | request->status = TAPE_REQUEST_DONE; | |
574 | list_del(&request->list); | |
575 | ||
576 | /* Decrease ref_count for removed request. */ | |
577 | request->device = tape_put_device(device); | |
578 | request->rc = -EIO; | |
579 | if (request->callback != NULL) | |
580 | request->callback(request, request->callback_data); | |
581 | } | |
582 | } | |
583 | ||
584 | /* | |
585 | * Driverfs tape remove function. | |
586 | * | |
587 | * This function is called whenever the common I/O layer detects the device | |
588 | * gone. This can happen at any time and we cannot refuse. | |
589 | */ | |
590 | void | |
591 | tape_generic_remove(struct ccw_device *cdev) | |
592 | { | |
593 | struct tape_device * device; | |
594 | ||
595 | device = cdev->dev.driver_data; | |
596 | if (!device) { | |
597 | PRINT_ERR("No device pointer in tape_generic_remove!\n"); | |
598 | return; | |
599 | } | |
600 | DBF_LH(3, "(%08x): tape_generic_remove(%p)\n", device->cdev_id, cdev); | |
601 | ||
602 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
603 | switch (device->tape_state) { | |
604 | case TS_INIT: | |
605 | tape_state_set(device, TS_NOT_OPER); | |
606 | case TS_NOT_OPER: | |
607 | /* | |
608 | * Nothing to do. | |
609 | */ | |
610 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
611 | break; | |
612 | case TS_UNUSED: | |
613 | /* | |
614 | * Need only to release the device. | |
615 | */ | |
616 | tape_state_set(device, TS_NOT_OPER); | |
617 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
618 | tape_cleanup_device(device); | |
619 | break; | |
620 | default: | |
621 | /* | |
622 | * There may be requests on the queue. We will not get | |
623 | * an interrupt for a request that was running. So we | |
624 | * just post them all as I/O errors. | |
625 | */ | |
626 | DBF_EVENT(3, "(%08x): Drive in use vanished!\n", | |
627 | device->cdev_id); | |
628 | PRINT_WARN("(%s): Drive in use vanished - " | |
629 | "expect trouble!\n", | |
630 | device->cdev->dev.bus_id); | |
631 | PRINT_WARN("State was %i\n", device->tape_state); | |
632 | tape_state_set(device, TS_NOT_OPER); | |
633 | __tape_discard_requests(device); | |
634 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
635 | tape_cleanup_device(device); | |
636 | } | |
637 | ||
638 | if (cdev->dev.driver_data != NULL) { | |
639 | sysfs_remove_group(&cdev->dev.kobj, &tape_attr_group); | |
640 | cdev->dev.driver_data = tape_put_device(cdev->dev.driver_data); | |
641 | } | |
642 | } | |
643 | ||
644 | /* | |
645 | * Allocate a new tape ccw request | |
646 | */ | |
647 | struct tape_request * | |
648 | tape_alloc_request(int cplength, int datasize) | |
649 | { | |
650 | struct tape_request *request; | |
651 | ||
652 | if (datasize > PAGE_SIZE || (cplength*sizeof(struct ccw1)) > PAGE_SIZE) | |
653 | BUG(); | |
654 | ||
655 | DBF_LH(6, "tape_alloc_request(%d, %d)\n", cplength, datasize); | |
656 | ||
657 | request = (struct tape_request *) kmalloc(sizeof(struct tape_request), | |
658 | GFP_KERNEL); | |
659 | if (request == NULL) { | |
660 | DBF_EXCEPTION(1, "cqra nomem\n"); | |
661 | return ERR_PTR(-ENOMEM); | |
662 | } | |
663 | memset(request, 0, sizeof(struct tape_request)); | |
664 | /* allocate channel program */ | |
665 | if (cplength > 0) { | |
666 | request->cpaddr = kmalloc(cplength*sizeof(struct ccw1), | |
667 | GFP_ATOMIC | GFP_DMA); | |
668 | if (request->cpaddr == NULL) { | |
669 | DBF_EXCEPTION(1, "cqra nomem\n"); | |
670 | kfree(request); | |
671 | return ERR_PTR(-ENOMEM); | |
672 | } | |
673 | memset(request->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
674 | } | |
675 | /* alloc small kernel buffer */ | |
676 | if (datasize > 0) { | |
677 | request->cpdata = kmalloc(datasize, GFP_KERNEL | GFP_DMA); | |
678 | if (request->cpdata == NULL) { | |
679 | DBF_EXCEPTION(1, "cqra nomem\n"); | |
680 | if (request->cpaddr != NULL) | |
681 | kfree(request->cpaddr); | |
682 | kfree(request); | |
683 | return ERR_PTR(-ENOMEM); | |
684 | } | |
685 | memset(request->cpdata, 0, datasize); | |
686 | } | |
687 | DBF_LH(6, "New request %p(%p/%p)\n", request, request->cpaddr, | |
688 | request->cpdata); | |
689 | ||
690 | return request; | |
691 | } | |
692 | ||
693 | /* | |
694 | * Free tape ccw request | |
695 | */ | |
696 | void | |
697 | tape_free_request (struct tape_request * request) | |
698 | { | |
699 | DBF_LH(6, "Free request %p\n", request); | |
700 | ||
701 | if (request->device != NULL) { | |
702 | request->device = tape_put_device(request->device); | |
703 | } | |
704 | if (request->cpdata != NULL) | |
705 | kfree(request->cpdata); | |
706 | if (request->cpaddr != NULL) | |
707 | kfree(request->cpaddr); | |
708 | kfree(request); | |
709 | } | |
710 | ||
711 | static inline void | |
712 | __tape_do_io_list(struct tape_device *device) | |
713 | { | |
714 | struct list_head *l, *n; | |
715 | struct tape_request *request; | |
716 | int rc; | |
717 | ||
718 | DBF_LH(6, "__tape_do_io_list(%p)\n", device); | |
719 | /* | |
720 | * Try to start each request on request queue until one is | |
721 | * started successful. | |
722 | */ | |
723 | list_for_each_safe(l, n, &device->req_queue) { | |
724 | request = list_entry(l, struct tape_request, list); | |
725 | #ifdef CONFIG_S390_TAPE_BLOCK | |
726 | if (request->op == TO_BLOCK) | |
727 | device->discipline->check_locate(device, request); | |
728 | #endif | |
729 | rc = ccw_device_start(device->cdev, request->cpaddr, | |
730 | (unsigned long) request, 0x00, | |
731 | request->options); | |
732 | if (rc == 0) { | |
733 | request->status = TAPE_REQUEST_IN_IO; | |
734 | break; | |
735 | } | |
736 | /* Start failed. Remove request and indicate failure. */ | |
737 | DBF_EVENT(1, "tape: DOIO failed with er = %i\n", rc); | |
738 | ||
739 | /* Set ending status and do callback. */ | |
740 | request->rc = rc; | |
741 | request->status = TAPE_REQUEST_DONE; | |
742 | __tape_remove_request(device, request); | |
743 | } | |
744 | } | |
745 | ||
746 | static void | |
747 | __tape_remove_request(struct tape_device *device, struct tape_request *request) | |
748 | { | |
749 | /* Remove from request queue. */ | |
750 | list_del(&request->list); | |
751 | ||
752 | /* Do callback. */ | |
753 | if (request->callback != NULL) | |
754 | request->callback(request, request->callback_data); | |
755 | ||
756 | /* Start next request. */ | |
757 | if (!list_empty(&device->req_queue)) | |
758 | __tape_do_io_list(device); | |
759 | } | |
760 | ||
761 | /* | |
762 | * Write sense data to console/dbf | |
763 | */ | |
764 | void | |
765 | tape_dump_sense(struct tape_device* device, struct tape_request *request, | |
766 | struct irb *irb) | |
767 | { | |
768 | unsigned int *sptr; | |
769 | ||
770 | PRINT_INFO("-------------------------------------------------\n"); | |
771 | PRINT_INFO("DSTAT : %02x CSTAT: %02x CPA: %04x\n", | |
772 | irb->scsw.dstat, irb->scsw.cstat, irb->scsw.cpa); | |
773 | PRINT_INFO("DEVICE: %s\n", device->cdev->dev.bus_id); | |
774 | if (request != NULL) | |
775 | PRINT_INFO("OP : %s\n", tape_op_verbose[request->op]); | |
776 | ||
777 | sptr = (unsigned int *) irb->ecw; | |
778 | PRINT_INFO("Sense data: %08X %08X %08X %08X \n", | |
779 | sptr[0], sptr[1], sptr[2], sptr[3]); | |
780 | PRINT_INFO("Sense data: %08X %08X %08X %08X \n", | |
781 | sptr[4], sptr[5], sptr[6], sptr[7]); | |
782 | PRINT_INFO("--------------------------------------------------\n"); | |
783 | } | |
784 | ||
785 | /* | |
786 | * Write sense data to dbf | |
787 | */ | |
788 | void | |
789 | tape_dump_sense_dbf(struct tape_device *device, struct tape_request *request, | |
790 | struct irb *irb) | |
791 | { | |
792 | unsigned int *sptr; | |
793 | const char* op; | |
794 | ||
795 | if (request != NULL) | |
796 | op = tape_op_verbose[request->op]; | |
797 | else | |
798 | op = "---"; | |
799 | DBF_EVENT(3, "DSTAT : %02x CSTAT: %02x\n", | |
800 | irb->scsw.dstat,irb->scsw.cstat); | |
801 | DBF_EVENT(3, "DEVICE: %08x OP\t: %s\n", device->cdev_id, op); | |
802 | sptr = (unsigned int *) irb->ecw; | |
803 | DBF_EVENT(3, "%08x %08x\n", sptr[0], sptr[1]); | |
804 | DBF_EVENT(3, "%08x %08x\n", sptr[2], sptr[3]); | |
805 | DBF_EVENT(3, "%08x %08x\n", sptr[4], sptr[5]); | |
806 | DBF_EVENT(3, "%08x %08x\n", sptr[6], sptr[7]); | |
807 | } | |
808 | ||
809 | /* | |
810 | * I/O helper function. Adds the request to the request queue | |
811 | * and starts it if the tape is idle. Has to be called with | |
812 | * the device lock held. | |
813 | */ | |
814 | static inline int | |
815 | __tape_do_io(struct tape_device *device, struct tape_request *request) | |
816 | { | |
817 | int rc; | |
818 | ||
819 | switch (request->op) { | |
820 | case TO_MSEN: | |
821 | case TO_ASSIGN: | |
822 | case TO_UNASSIGN: | |
823 | case TO_READ_ATTMSG: | |
824 | if (device->tape_state == TS_INIT) | |
825 | break; | |
826 | if (device->tape_state == TS_UNUSED) | |
827 | break; | |
828 | default: | |
829 | if (device->tape_state == TS_BLKUSE) | |
830 | break; | |
831 | if (device->tape_state != TS_IN_USE) | |
832 | return -ENODEV; | |
833 | } | |
834 | ||
835 | /* Increase use count of device for the added request. */ | |
836 | request->device = tape_get_device_reference(device); | |
837 | ||
838 | if (list_empty(&device->req_queue)) { | |
839 | /* No other requests are on the queue. Start this one. */ | |
840 | #ifdef CONFIG_S390_TAPE_BLOCK | |
841 | if (request->op == TO_BLOCK) | |
842 | device->discipline->check_locate(device, request); | |
843 | #endif | |
844 | rc = ccw_device_start(device->cdev, request->cpaddr, | |
845 | (unsigned long) request, 0x00, | |
846 | request->options); | |
847 | if (rc) { | |
848 | DBF_EVENT(1, "tape: DOIO failed with rc = %i\n", rc); | |
849 | return rc; | |
850 | } | |
851 | DBF_LH(5, "Request %p added for execution.\n", request); | |
852 | list_add(&request->list, &device->req_queue); | |
853 | request->status = TAPE_REQUEST_IN_IO; | |
854 | } else { | |
855 | DBF_LH(5, "Request %p add to queue.\n", request); | |
856 | list_add_tail(&request->list, &device->req_queue); | |
857 | request->status = TAPE_REQUEST_QUEUED; | |
858 | } | |
859 | return 0; | |
860 | } | |
861 | ||
862 | /* | |
863 | * Add the request to the request queue, try to start it if the | |
864 | * tape is idle. Return without waiting for end of i/o. | |
865 | */ | |
866 | int | |
867 | tape_do_io_async(struct tape_device *device, struct tape_request *request) | |
868 | { | |
869 | int rc; | |
870 | ||
871 | DBF_LH(6, "tape_do_io_async(%p, %p)\n", device, request); | |
872 | ||
873 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
874 | /* Add request to request queue and try to start it. */ | |
875 | rc = __tape_do_io(device, request); | |
876 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
877 | return rc; | |
878 | } | |
879 | ||
880 | /* | |
881 | * tape_do_io/__tape_wake_up | |
882 | * Add the request to the request queue, try to start it if the | |
883 | * tape is idle and wait uninterruptible for its completion. | |
884 | */ | |
885 | static void | |
886 | __tape_wake_up(struct tape_request *request, void *data) | |
887 | { | |
888 | request->callback = NULL; | |
889 | wake_up((wait_queue_head_t *) data); | |
890 | } | |
891 | ||
892 | int | |
893 | tape_do_io(struct tape_device *device, struct tape_request *request) | |
894 | { | |
895 | wait_queue_head_t wq; | |
896 | int rc; | |
897 | ||
898 | init_waitqueue_head(&wq); | |
899 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
900 | /* Setup callback */ | |
901 | request->callback = __tape_wake_up; | |
902 | request->callback_data = &wq; | |
903 | /* Add request to request queue and try to start it. */ | |
904 | rc = __tape_do_io(device, request); | |
905 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
906 | if (rc) | |
907 | return rc; | |
908 | /* Request added to the queue. Wait for its completion. */ | |
909 | wait_event(wq, (request->callback == NULL)); | |
910 | /* Get rc from request */ | |
911 | return request->rc; | |
912 | } | |
913 | ||
914 | /* | |
915 | * tape_do_io_interruptible/__tape_wake_up_interruptible | |
916 | * Add the request to the request queue, try to start it if the | |
917 | * tape is idle and wait uninterruptible for its completion. | |
918 | */ | |
919 | static void | |
920 | __tape_wake_up_interruptible(struct tape_request *request, void *data) | |
921 | { | |
922 | request->callback = NULL; | |
923 | wake_up_interruptible((wait_queue_head_t *) data); | |
924 | } | |
925 | ||
926 | int | |
927 | tape_do_io_interruptible(struct tape_device *device, | |
928 | struct tape_request *request) | |
929 | { | |
930 | wait_queue_head_t wq; | |
931 | int rc; | |
932 | ||
933 | init_waitqueue_head(&wq); | |
934 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
935 | /* Setup callback */ | |
936 | request->callback = __tape_wake_up_interruptible; | |
937 | request->callback_data = &wq; | |
938 | rc = __tape_do_io(device, request); | |
939 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
940 | if (rc) | |
941 | return rc; | |
942 | /* Request added to the queue. Wait for its completion. */ | |
943 | rc = wait_event_interruptible(wq, (request->callback == NULL)); | |
944 | if (rc != -ERESTARTSYS) | |
945 | /* Request finished normally. */ | |
946 | return request->rc; | |
947 | /* Interrupted by a signal. We have to stop the current request. */ | |
948 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
949 | rc = __tape_halt_io(device, request); | |
950 | if (rc == 0) { | |
951 | DBF_EVENT(3, "IO stopped on %08x\n", device->cdev_id); | |
952 | rc = -ERESTARTSYS; | |
953 | } | |
954 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
955 | return rc; | |
956 | } | |
957 | ||
958 | /* | |
959 | * Handle requests that return an i/o error in the irb. | |
960 | */ | |
961 | static inline void | |
962 | tape_handle_killed_request( | |
963 | struct tape_device *device, | |
964 | struct tape_request *request) | |
965 | { | |
966 | if(request != NULL) { | |
967 | /* Set ending status. FIXME: Should the request be retried? */ | |
968 | request->rc = -EIO; | |
969 | request->status = TAPE_REQUEST_DONE; | |
970 | __tape_remove_request(device, request); | |
971 | } else { | |
972 | __tape_do_io_list(device); | |
973 | } | |
974 | } | |
975 | ||
976 | /* | |
977 | * Tape interrupt routine, called from the ccw_device layer | |
978 | */ | |
979 | static void | |
980 | __tape_do_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb) | |
981 | { | |
982 | struct tape_device *device; | |
983 | struct tape_request *request; | |
984 | int final; | |
985 | int rc; | |
986 | ||
987 | device = (struct tape_device *) cdev->dev.driver_data; | |
988 | if (device == NULL) { | |
989 | PRINT_ERR("could not get device structure for %s " | |
990 | "in interrupt\n", cdev->dev.bus_id); | |
991 | return; | |
992 | } | |
993 | request = (struct tape_request *) intparm; | |
994 | ||
995 | DBF_LH(6, "__tape_do_irq(device=%p, request=%p)\n", device, request); | |
996 | ||
997 | /* On special conditions irb is an error pointer */ | |
998 | if (IS_ERR(irb)) { | |
999 | switch (PTR_ERR(irb)) { | |
1000 | case -ETIMEDOUT: | |
1001 | PRINT_WARN("(%s): Request timed out\n", | |
1002 | cdev->dev.bus_id); | |
1003 | case -EIO: | |
1004 | tape_handle_killed_request(device, request); | |
1005 | break; | |
1006 | default: | |
1007 | PRINT_ERR("(%s): Unexpected i/o error %li\n", | |
1008 | cdev->dev.bus_id, | |
1009 | PTR_ERR(irb)); | |
1010 | } | |
1011 | return; | |
1012 | } | |
1013 | ||
1014 | /* May be an unsolicited irq */ | |
1015 | if(request != NULL) | |
1016 | request->rescnt = irb->scsw.count; | |
1017 | ||
1018 | if (irb->scsw.dstat != 0x0c) { | |
1019 | /* Set the 'ONLINE' flag depending on sense byte 1 */ | |
1020 | if(*(((__u8 *) irb->ecw) + 1) & SENSE_DRIVE_ONLINE) | |
1021 | device->tape_generic_status |= GMT_ONLINE(~0); | |
1022 | else | |
1023 | device->tape_generic_status &= ~GMT_ONLINE(~0); | |
1024 | ||
1025 | /* | |
1026 | * Any request that does not come back with channel end | |
1027 | * and device end is unusual. Log the sense data. | |
1028 | */ | |
1029 | DBF_EVENT(3,"-- Tape Interrupthandler --\n"); | |
1030 | tape_dump_sense_dbf(device, request, irb); | |
1031 | } else { | |
1032 | /* Upon normal completion the device _is_ online */ | |
1033 | device->tape_generic_status |= GMT_ONLINE(~0); | |
1034 | } | |
1035 | if (device->tape_state == TS_NOT_OPER) { | |
1036 | DBF_EVENT(6, "tape:device is not operational\n"); | |
1037 | return; | |
1038 | } | |
1039 | ||
1040 | /* | |
1041 | * Request that were canceled still come back with an interrupt. | |
1042 | * To detect these request the state will be set to TAPE_REQUEST_DONE. | |
1043 | */ | |
1044 | if(request != NULL && request->status == TAPE_REQUEST_DONE) { | |
1045 | __tape_remove_request(device, request); | |
1046 | return; | |
1047 | } | |
1048 | ||
1049 | rc = device->discipline->irq(device, request, irb); | |
1050 | /* | |
1051 | * rc < 0 : request finished unsuccessfully. | |
1052 | * rc == TAPE_IO_SUCCESS: request finished successfully. | |
1053 | * rc == TAPE_IO_PENDING: request is still running. Ignore rc. | |
1054 | * rc == TAPE_IO_RETRY: request finished but needs another go. | |
1055 | * rc == TAPE_IO_STOP: request needs to get terminated. | |
1056 | */ | |
1057 | final = 0; | |
1058 | switch (rc) { | |
1059 | case TAPE_IO_SUCCESS: | |
1060 | /* Upon normal completion the device _is_ online */ | |
1061 | device->tape_generic_status |= GMT_ONLINE(~0); | |
1062 | final = 1; | |
1063 | break; | |
1064 | case TAPE_IO_PENDING: | |
1065 | break; | |
1066 | case TAPE_IO_RETRY: | |
1067 | #ifdef CONFIG_S390_TAPE_BLOCK | |
1068 | if (request->op == TO_BLOCK) | |
1069 | device->discipline->check_locate(device, request); | |
1070 | #endif | |
1071 | rc = ccw_device_start(cdev, request->cpaddr, | |
1072 | (unsigned long) request, 0x00, | |
1073 | request->options); | |
1074 | if (rc) { | |
1075 | DBF_EVENT(1, "tape: DOIO failed with er = %i\n", rc); | |
1076 | final = 1; | |
1077 | } | |
1078 | break; | |
1079 | case TAPE_IO_STOP: | |
1080 | __tape_halt_io(device, request); | |
1081 | break; | |
1082 | default: | |
1083 | if (rc > 0) { | |
1084 | DBF_EVENT(6, "xunknownrc\n"); | |
1085 | PRINT_ERR("Invalid return code from discipline " | |
1086 | "interrupt function.\n"); | |
1087 | rc = -EIO; | |
1088 | } | |
1089 | final = 1; | |
1090 | break; | |
1091 | } | |
1092 | if (final) { | |
1093 | /* May be an unsolicited irq */ | |
1094 | if(request != NULL) { | |
1095 | /* Set ending status. */ | |
1096 | request->rc = rc; | |
1097 | request->status = TAPE_REQUEST_DONE; | |
1098 | __tape_remove_request(device, request); | |
1099 | } else { | |
1100 | __tape_do_io_list(device); | |
1101 | } | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | /* | |
1106 | * Tape device open function used by tape_char & tape_block frontends. | |
1107 | */ | |
1108 | int | |
1109 | tape_open(struct tape_device *device) | |
1110 | { | |
1111 | int rc; | |
1112 | ||
1113 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1114 | if (device->tape_state == TS_NOT_OPER) { | |
1115 | DBF_EVENT(6, "TAPE:nodev\n"); | |
1116 | rc = -ENODEV; | |
1117 | } else if (device->tape_state == TS_IN_USE) { | |
1118 | DBF_EVENT(6, "TAPE:dbusy\n"); | |
1119 | rc = -EBUSY; | |
1120 | } else if (device->tape_state == TS_BLKUSE) { | |
1121 | DBF_EVENT(6, "TAPE:dbusy\n"); | |
1122 | rc = -EBUSY; | |
1123 | } else if (device->discipline != NULL && | |
1124 | !try_module_get(device->discipline->owner)) { | |
1125 | DBF_EVENT(6, "TAPE:nodisc\n"); | |
1126 | rc = -ENODEV; | |
1127 | } else { | |
1128 | tape_state_set(device, TS_IN_USE); | |
1129 | rc = 0; | |
1130 | } | |
1131 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1132 | return rc; | |
1133 | } | |
1134 | ||
1135 | /* | |
1136 | * Tape device release function used by tape_char & tape_block frontends. | |
1137 | */ | |
1138 | int | |
1139 | tape_release(struct tape_device *device) | |
1140 | { | |
1141 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1142 | if (device->tape_state == TS_IN_USE) | |
1143 | tape_state_set(device, TS_UNUSED); | |
1144 | module_put(device->discipline->owner); | |
1145 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1146 | return 0; | |
1147 | } | |
1148 | ||
1149 | /* | |
1150 | * Execute a magnetic tape command a number of times. | |
1151 | */ | |
1152 | int | |
1153 | tape_mtop(struct tape_device *device, int mt_op, int mt_count) | |
1154 | { | |
1155 | tape_mtop_fn fn; | |
1156 | int rc; | |
1157 | ||
1158 | DBF_EVENT(6, "TAPE:mtio\n"); | |
1159 | DBF_EVENT(6, "TAPE:ioop: %x\n", mt_op); | |
1160 | DBF_EVENT(6, "TAPE:arg: %x\n", mt_count); | |
1161 | ||
1162 | if (mt_op < 0 || mt_op >= TAPE_NR_MTOPS) | |
1163 | return -EINVAL; | |
1164 | fn = device->discipline->mtop_array[mt_op]; | |
1165 | if (fn == NULL) | |
1166 | return -EINVAL; | |
1167 | ||
1168 | /* We assume that the backends can handle count up to 500. */ | |
1169 | if (mt_op == MTBSR || mt_op == MTFSR || mt_op == MTFSF || | |
1170 | mt_op == MTBSF || mt_op == MTFSFM || mt_op == MTBSFM) { | |
1171 | rc = 0; | |
1172 | for (; mt_count > 500; mt_count -= 500) | |
1173 | if ((rc = fn(device, 500)) != 0) | |
1174 | break; | |
1175 | if (rc == 0) | |
1176 | rc = fn(device, mt_count); | |
1177 | } else | |
1178 | rc = fn(device, mt_count); | |
1179 | return rc; | |
1180 | ||
1181 | } | |
1182 | ||
1183 | /* | |
1184 | * Tape init function. | |
1185 | */ | |
1186 | static int | |
1187 | tape_init (void) | |
1188 | { | |
1189 | TAPE_DBF_AREA = debug_register ( "tape", 1, 2, 4*sizeof(long)); | |
1190 | debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view); | |
1191 | #ifdef DBF_LIKE_HELL | |
1192 | debug_set_level(TAPE_DBF_AREA, 6); | |
1193 | #endif | |
1194 | DBF_EVENT(3, "tape init: ($Revision: 1.51 $)\n"); | |
1195 | tape_proc_init(); | |
1196 | tapechar_init (); | |
1197 | tapeblock_init (); | |
1198 | return 0; | |
1199 | } | |
1200 | ||
1201 | /* | |
1202 | * Tape exit function. | |
1203 | */ | |
1204 | static void | |
1205 | tape_exit(void) | |
1206 | { | |
1207 | DBF_EVENT(6, "tape exit\n"); | |
1208 | ||
1209 | /* Get rid of the frontends */ | |
1210 | tapechar_exit(); | |
1211 | tapeblock_exit(); | |
1212 | tape_proc_cleanup(); | |
1213 | debug_unregister (TAPE_DBF_AREA); | |
1214 | } | |
1215 | ||
1216 | MODULE_AUTHOR("(C) 2001 IBM Deutschland Entwicklung GmbH by Carsten Otte and " | |
1217 | "Michael Holzheu (cotte@de.ibm.com,holzheu@de.ibm.com)"); | |
1218 | MODULE_DESCRIPTION("Linux on zSeries channel attached " | |
1219 | "tape device driver ($Revision: 1.51 $)"); | |
1220 | MODULE_LICENSE("GPL"); | |
1221 | ||
1222 | module_init(tape_init); | |
1223 | module_exit(tape_exit); | |
1224 | ||
1225 | EXPORT_SYMBOL(tape_generic_remove); | |
1226 | EXPORT_SYMBOL(tape_generic_probe); | |
1227 | EXPORT_SYMBOL(tape_generic_online); | |
1228 | EXPORT_SYMBOL(tape_generic_offline); | |
1229 | EXPORT_SYMBOL(tape_put_device); | |
1230 | EXPORT_SYMBOL(tape_get_device_reference); | |
1231 | EXPORT_SYMBOL(tape_state_verbose); | |
1232 | EXPORT_SYMBOL(tape_op_verbose); | |
1233 | EXPORT_SYMBOL(tape_state_set); | |
1234 | EXPORT_SYMBOL(tape_med_state_set); | |
1235 | EXPORT_SYMBOL(tape_alloc_request); | |
1236 | EXPORT_SYMBOL(tape_free_request); | |
1237 | EXPORT_SYMBOL(tape_dump_sense); | |
1238 | EXPORT_SYMBOL(tape_dump_sense_dbf); | |
1239 | EXPORT_SYMBOL(tape_do_io); | |
1240 | EXPORT_SYMBOL(tape_do_io_async); | |
1241 | EXPORT_SYMBOL(tape_do_io_interruptible); | |
1242 | EXPORT_SYMBOL(tape_mtop); |