Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/s390/char/tape_core.c | |
3 | * basic function of the tape device driver | |
4 | * | |
5 | * S390 and zSeries version | |
4111796d | 6 | * Copyright (C) 2001,2005 IBM Deutschland Entwicklung GmbH, IBM Corporation |
1da177e4 LT |
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> | |
4111796d | 11 | * Stefan Bader <shbader@de.ibm.com> |
1da177e4 LT |
12 | */ |
13 | ||
1da177e4 LT |
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 *); | |
4111796d | 31 | static void tape_delayed_next_request(void * data); |
1da177e4 LT |
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 | |
3fd3c0a5 | 110 | tape_medium_state_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
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 | |
3fd3c0a5 | 122 | tape_first_minor_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
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 | |
3fd3c0a5 | 134 | tape_state_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
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 | |
3fd3c0a5 | 147 | tape_operation_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
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 | |
3fd3c0a5 | 174 | tape_blocksize_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
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); | |
f976069a PO |
212 | DBF_EVENT(4, "old ts:\t\n"); |
213 | if (device->tape_state < TS_SIZE && device->tape_state >=0 ) | |
1da177e4 LT |
214 | str = tape_state_verbose[device->tape_state]; |
215 | else | |
216 | str = "UNKNOWN TS"; | |
217 | DBF_EVENT(4, "%s\n", str); | |
218 | DBF_EVENT(4, "new ts:\t\n"); | |
f976069a | 219 | if (newstate < TS_SIZE && newstate >= 0) |
1da177e4 LT |
220 | str = tape_state_verbose[newstate]; |
221 | else | |
222 | str = "UNKNOWN TS"; | |
223 | DBF_EVENT(4, "%s\n", str); | |
224 | device->tape_state = newstate; | |
225 | wake_up(&device->state_change_wq); | |
226 | } | |
227 | ||
228 | void | |
229 | tape_med_state_set(struct tape_device *device, enum tape_medium_state newstate) | |
230 | { | |
231 | if (device->medium_state == newstate) | |
232 | return; | |
233 | switch(newstate){ | |
234 | case MS_UNLOADED: | |
235 | device->tape_generic_status |= GMT_DR_OPEN(~0); | |
236 | PRINT_INFO("(%s): Tape is unloaded\n", | |
237 | device->cdev->dev.bus_id); | |
238 | break; | |
239 | case MS_LOADED: | |
240 | device->tape_generic_status &= ~GMT_DR_OPEN(~0); | |
241 | PRINT_INFO("(%s): Tape has been mounted\n", | |
242 | device->cdev->dev.bus_id); | |
243 | break; | |
244 | default: | |
245 | // print nothing | |
246 | break; | |
247 | } | |
248 | device->medium_state = newstate; | |
249 | wake_up(&device->state_change_wq); | |
250 | } | |
251 | ||
252 | /* | |
253 | * Stop running ccw. Has to be called with the device lock held. | |
254 | */ | |
255 | static inline int | |
4111796d | 256 | __tape_cancel_io(struct tape_device *device, struct tape_request *request) |
1da177e4 LT |
257 | { |
258 | int retries; | |
259 | int rc; | |
260 | ||
261 | /* Check if interrupt has already been processed */ | |
262 | if (request->callback == NULL) | |
263 | return 0; | |
264 | ||
265 | rc = 0; | |
266 | for (retries = 0; retries < 5; retries++) { | |
267 | rc = ccw_device_clear(device->cdev, (long) request); | |
268 | ||
4111796d SB |
269 | switch (rc) { |
270 | case 0: | |
271 | request->status = TAPE_REQUEST_DONE; | |
272 | return 0; | |
273 | case -EBUSY: | |
274 | request->status = TAPE_REQUEST_CANCEL; | |
275 | schedule_work(&device->tape_dnr); | |
276 | return 0; | |
277 | case -ENODEV: | |
278 | DBF_EXCEPTION(2, "device gone, retry\n"); | |
279 | break; | |
280 | case -EIO: | |
281 | DBF_EXCEPTION(2, "I/O error, retry\n"); | |
282 | break; | |
283 | default: | |
284 | BUG(); | |
1da177e4 | 285 | } |
1da177e4 LT |
286 | } |
287 | ||
288 | return rc; | |
289 | } | |
290 | ||
291 | /* | |
292 | * Add device into the sorted list, giving it the first | |
293 | * available minor number. | |
294 | */ | |
295 | static int | |
296 | tape_assign_minor(struct tape_device *device) | |
297 | { | |
298 | struct tape_device *tmp; | |
299 | int minor; | |
300 | ||
301 | minor = 0; | |
302 | write_lock(&tape_device_lock); | |
303 | list_for_each_entry(tmp, &tape_device_list, node) { | |
304 | if (minor < tmp->first_minor) | |
305 | break; | |
306 | minor += TAPE_MINORS_PER_DEV; | |
307 | } | |
308 | if (minor >= 256) { | |
309 | write_unlock(&tape_device_lock); | |
310 | return -ENODEV; | |
311 | } | |
312 | device->first_minor = minor; | |
313 | list_add_tail(&device->node, &tmp->node); | |
314 | write_unlock(&tape_device_lock); | |
315 | return 0; | |
316 | } | |
317 | ||
318 | /* remove device from the list */ | |
319 | static void | |
320 | tape_remove_minor(struct tape_device *device) | |
321 | { | |
322 | write_lock(&tape_device_lock); | |
323 | list_del_init(&device->node); | |
324 | device->first_minor = -1; | |
325 | write_unlock(&tape_device_lock); | |
326 | } | |
327 | ||
328 | /* | |
329 | * Set a device online. | |
330 | * | |
331 | * This function is called by the common I/O layer to move a device from the | |
332 | * detected but offline into the online state. | |
333 | * If we return an error (RC < 0) the device remains in the offline state. This | |
334 | * can happen if the device is assigned somewhere else, for example. | |
335 | */ | |
336 | int | |
337 | tape_generic_online(struct tape_device *device, | |
338 | struct tape_discipline *discipline) | |
339 | { | |
340 | int rc; | |
341 | ||
342 | DBF_LH(6, "tape_enable_device(%p, %p)\n", device, discipline); | |
343 | ||
344 | if (device->tape_state != TS_INIT) { | |
345 | DBF_LH(3, "Tapestate not INIT (%d)\n", device->tape_state); | |
346 | return -EINVAL; | |
347 | } | |
348 | ||
349 | /* Let the discipline have a go at the device. */ | |
350 | device->discipline = discipline; | |
351 | if (!try_module_get(discipline->owner)) { | |
352 | PRINT_ERR("Cannot get module. Module gone.\n"); | |
353 | return -EINVAL; | |
354 | } | |
355 | ||
356 | rc = discipline->setup_device(device); | |
357 | if (rc) | |
358 | goto out; | |
359 | rc = tape_assign_minor(device); | |
360 | if (rc) | |
361 | goto out_discipline; | |
362 | ||
363 | rc = tapechar_setup_device(device); | |
364 | if (rc) | |
365 | goto out_minor; | |
366 | rc = tapeblock_setup_device(device); | |
367 | if (rc) | |
368 | goto out_char; | |
369 | ||
370 | tape_state_set(device, TS_UNUSED); | |
371 | ||
372 | DBF_LH(3, "(%08x): Drive set online\n", device->cdev_id); | |
373 | ||
374 | return 0; | |
375 | ||
376 | out_char: | |
377 | tapechar_cleanup_device(device); | |
378 | out_discipline: | |
379 | device->discipline->cleanup_device(device); | |
380 | device->discipline = NULL; | |
381 | out_minor: | |
382 | tape_remove_minor(device); | |
383 | out: | |
384 | module_put(discipline->owner); | |
385 | return rc; | |
386 | } | |
387 | ||
388 | static inline void | |
389 | tape_cleanup_device(struct tape_device *device) | |
390 | { | |
391 | tapeblock_cleanup_device(device); | |
392 | tapechar_cleanup_device(device); | |
393 | device->discipline->cleanup_device(device); | |
394 | module_put(device->discipline->owner); | |
395 | tape_remove_minor(device); | |
396 | tape_med_state_set(device, MS_UNKNOWN); | |
397 | } | |
398 | ||
399 | /* | |
400 | * Set device offline. | |
401 | * | |
402 | * Called by the common I/O layer if the drive should set offline on user | |
403 | * request. We may prevent this by returning an error. | |
404 | * Manual offline is only allowed while the drive is not in use. | |
405 | */ | |
406 | int | |
407 | tape_generic_offline(struct tape_device *device) | |
408 | { | |
409 | if (!device) { | |
410 | PRINT_ERR("tape_generic_offline: no such device\n"); | |
411 | return -ENODEV; | |
412 | } | |
413 | ||
414 | DBF_LH(3, "(%08x): tape_generic_offline(%p)\n", | |
415 | device->cdev_id, device); | |
416 | ||
417 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
418 | switch (device->tape_state) { | |
419 | case TS_INIT: | |
420 | case TS_NOT_OPER: | |
421 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
422 | break; | |
423 | case TS_UNUSED: | |
424 | tape_state_set(device, TS_INIT); | |
425 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
426 | tape_cleanup_device(device); | |
427 | break; | |
428 | default: | |
429 | DBF_EVENT(3, "(%08x): Set offline failed " | |
430 | "- drive in use.\n", | |
431 | device->cdev_id); | |
432 | PRINT_WARN("(%s): Set offline failed " | |
433 | "- drive in use.\n", | |
434 | device->cdev->dev.bus_id); | |
435 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
436 | return -EBUSY; | |
437 | } | |
438 | ||
439 | DBF_LH(3, "(%08x): Drive set offline.\n", device->cdev_id); | |
440 | return 0; | |
441 | } | |
442 | ||
443 | /* | |
444 | * Allocate memory for a new device structure. | |
445 | */ | |
446 | static struct tape_device * | |
447 | tape_alloc_device(void) | |
448 | { | |
449 | struct tape_device *device; | |
450 | ||
88abaab4 | 451 | device = kzalloc(sizeof(struct tape_device), GFP_KERNEL); |
1da177e4 LT |
452 | if (device == NULL) { |
453 | DBF_EXCEPTION(2, "ti:no mem\n"); | |
454 | PRINT_INFO ("can't allocate memory for " | |
455 | "tape info structure\n"); | |
456 | return ERR_PTR(-ENOMEM); | |
457 | } | |
88abaab4 | 458 | device->modeset_byte = kmalloc(1, GFP_KERNEL | GFP_DMA); |
1da177e4 LT |
459 | if (device->modeset_byte == NULL) { |
460 | DBF_EXCEPTION(2, "ti:no mem\n"); | |
461 | PRINT_INFO("can't allocate memory for modeset byte\n"); | |
462 | kfree(device); | |
463 | return ERR_PTR(-ENOMEM); | |
464 | } | |
465 | INIT_LIST_HEAD(&device->req_queue); | |
466 | INIT_LIST_HEAD(&device->node); | |
467 | init_waitqueue_head(&device->state_change_wq); | |
468 | device->tape_state = TS_INIT; | |
469 | device->medium_state = MS_UNKNOWN; | |
470 | *device->modeset_byte = 0; | |
471 | device->first_minor = -1; | |
472 | atomic_set(&device->ref_count, 1); | |
4111796d | 473 | INIT_WORK(&device->tape_dnr, tape_delayed_next_request, device); |
1da177e4 LT |
474 | |
475 | return device; | |
476 | } | |
477 | ||
478 | /* | |
479 | * Get a reference to an existing device structure. This will automatically | |
480 | * increment the reference count. | |
481 | */ | |
482 | struct tape_device * | |
483 | tape_get_device_reference(struct tape_device *device) | |
484 | { | |
485 | DBF_EVENT(4, "tape_get_device_reference(%p) = %i\n", device, | |
486 | atomic_inc_return(&device->ref_count)); | |
487 | ||
488 | return device; | |
489 | } | |
490 | ||
491 | /* | |
492 | * Decrease the reference counter of a devices structure. If the | |
493 | * reference counter reaches zero free the device structure. | |
494 | * The function returns a NULL pointer to be used by the caller | |
495 | * for clearing reference pointers. | |
496 | */ | |
497 | struct tape_device * | |
498 | tape_put_device(struct tape_device *device) | |
499 | { | |
500 | int remain; | |
501 | ||
502 | remain = atomic_dec_return(&device->ref_count); | |
503 | if (remain > 0) { | |
504 | DBF_EVENT(4, "tape_put_device(%p) -> %i\n", device, remain); | |
505 | } else { | |
506 | if (remain < 0) { | |
507 | DBF_EVENT(4, "put device without reference\n"); | |
508 | PRINT_ERR("put device without reference\n"); | |
509 | } else { | |
510 | DBF_EVENT(4, "tape_free_device(%p)\n", device); | |
511 | kfree(device->modeset_byte); | |
512 | kfree(device); | |
513 | } | |
514 | } | |
515 | ||
516 | return NULL; | |
517 | } | |
518 | ||
519 | /* | |
520 | * Find tape device by a device index. | |
521 | */ | |
522 | struct tape_device * | |
523 | tape_get_device(int devindex) | |
524 | { | |
525 | struct tape_device *device, *tmp; | |
526 | ||
527 | device = ERR_PTR(-ENODEV); | |
528 | read_lock(&tape_device_lock); | |
529 | list_for_each_entry(tmp, &tape_device_list, node) { | |
530 | if (tmp->first_minor / TAPE_MINORS_PER_DEV == devindex) { | |
531 | device = tape_get_device_reference(tmp); | |
532 | break; | |
533 | } | |
534 | } | |
535 | read_unlock(&tape_device_lock); | |
536 | return device; | |
537 | } | |
538 | ||
539 | /* | |
540 | * Driverfs tape probe function. | |
541 | */ | |
542 | int | |
543 | tape_generic_probe(struct ccw_device *cdev) | |
544 | { | |
545 | struct tape_device *device; | |
546 | ||
547 | device = tape_alloc_device(); | |
548 | if (IS_ERR(device)) | |
549 | return -ENODEV; | |
550 | PRINT_INFO("tape device %s found\n", cdev->dev.bus_id); | |
551 | cdev->dev.driver_data = device; | |
552 | device->cdev = cdev; | |
553 | device->cdev_id = busid_to_int(cdev->dev.bus_id); | |
554 | cdev->handler = __tape_do_irq; | |
555 | ||
556 | ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP); | |
557 | sysfs_create_group(&cdev->dev.kobj, &tape_attr_group); | |
558 | ||
559 | return 0; | |
560 | } | |
561 | ||
562 | static inline void | |
563 | __tape_discard_requests(struct tape_device *device) | |
564 | { | |
565 | struct tape_request * request; | |
566 | struct list_head * l, *n; | |
567 | ||
568 | list_for_each_safe(l, n, &device->req_queue) { | |
569 | request = list_entry(l, struct tape_request, list); | |
570 | if (request->status == TAPE_REQUEST_IN_IO) | |
571 | request->status = TAPE_REQUEST_DONE; | |
572 | list_del(&request->list); | |
573 | ||
574 | /* Decrease ref_count for removed request. */ | |
575 | request->device = tape_put_device(device); | |
576 | request->rc = -EIO; | |
577 | if (request->callback != NULL) | |
578 | request->callback(request, request->callback_data); | |
579 | } | |
580 | } | |
581 | ||
582 | /* | |
583 | * Driverfs tape remove function. | |
584 | * | |
585 | * This function is called whenever the common I/O layer detects the device | |
586 | * gone. This can happen at any time and we cannot refuse. | |
587 | */ | |
588 | void | |
589 | tape_generic_remove(struct ccw_device *cdev) | |
590 | { | |
591 | struct tape_device * device; | |
592 | ||
593 | device = cdev->dev.driver_data; | |
594 | if (!device) { | |
595 | PRINT_ERR("No device pointer in tape_generic_remove!\n"); | |
596 | return; | |
597 | } | |
598 | DBF_LH(3, "(%08x): tape_generic_remove(%p)\n", device->cdev_id, cdev); | |
599 | ||
600 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
601 | switch (device->tape_state) { | |
602 | case TS_INIT: | |
603 | tape_state_set(device, TS_NOT_OPER); | |
604 | case TS_NOT_OPER: | |
605 | /* | |
606 | * Nothing to do. | |
607 | */ | |
608 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
609 | break; | |
610 | case TS_UNUSED: | |
611 | /* | |
612 | * Need only to release the device. | |
613 | */ | |
614 | tape_state_set(device, TS_NOT_OPER); | |
615 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
616 | tape_cleanup_device(device); | |
617 | break; | |
618 | default: | |
619 | /* | |
620 | * There may be requests on the queue. We will not get | |
621 | * an interrupt for a request that was running. So we | |
622 | * just post them all as I/O errors. | |
623 | */ | |
624 | DBF_EVENT(3, "(%08x): Drive in use vanished!\n", | |
625 | device->cdev_id); | |
626 | PRINT_WARN("(%s): Drive in use vanished - " | |
627 | "expect trouble!\n", | |
628 | device->cdev->dev.bus_id); | |
629 | PRINT_WARN("State was %i\n", device->tape_state); | |
630 | tape_state_set(device, TS_NOT_OPER); | |
631 | __tape_discard_requests(device); | |
632 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
633 | tape_cleanup_device(device); | |
634 | } | |
635 | ||
636 | if (cdev->dev.driver_data != NULL) { | |
637 | sysfs_remove_group(&cdev->dev.kobj, &tape_attr_group); | |
638 | cdev->dev.driver_data = tape_put_device(cdev->dev.driver_data); | |
639 | } | |
640 | } | |
641 | ||
642 | /* | |
643 | * Allocate a new tape ccw request | |
644 | */ | |
645 | struct tape_request * | |
646 | tape_alloc_request(int cplength, int datasize) | |
647 | { | |
648 | struct tape_request *request; | |
649 | ||
650 | if (datasize > PAGE_SIZE || (cplength*sizeof(struct ccw1)) > PAGE_SIZE) | |
651 | BUG(); | |
652 | ||
653 | DBF_LH(6, "tape_alloc_request(%d, %d)\n", cplength, datasize); | |
654 | ||
88abaab4 | 655 | request = kzalloc(sizeof(struct tape_request), GFP_KERNEL); |
1da177e4 LT |
656 | if (request == NULL) { |
657 | DBF_EXCEPTION(1, "cqra nomem\n"); | |
658 | return ERR_PTR(-ENOMEM); | |
659 | } | |
1da177e4 LT |
660 | /* allocate channel program */ |
661 | if (cplength > 0) { | |
88abaab4 | 662 | request->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
663 | GFP_ATOMIC | GFP_DMA); |
664 | if (request->cpaddr == NULL) { | |
665 | DBF_EXCEPTION(1, "cqra nomem\n"); | |
666 | kfree(request); | |
667 | return ERR_PTR(-ENOMEM); | |
668 | } | |
1da177e4 LT |
669 | } |
670 | /* alloc small kernel buffer */ | |
671 | if (datasize > 0) { | |
88abaab4 | 672 | request->cpdata = kzalloc(datasize, GFP_KERNEL | GFP_DMA); |
1da177e4 LT |
673 | if (request->cpdata == NULL) { |
674 | DBF_EXCEPTION(1, "cqra nomem\n"); | |
17fd682e | 675 | kfree(request->cpaddr); |
1da177e4 LT |
676 | kfree(request); |
677 | return ERR_PTR(-ENOMEM); | |
678 | } | |
1da177e4 LT |
679 | } |
680 | DBF_LH(6, "New request %p(%p/%p)\n", request, request->cpaddr, | |
681 | request->cpdata); | |
682 | ||
683 | return request; | |
684 | } | |
685 | ||
686 | /* | |
687 | * Free tape ccw request | |
688 | */ | |
689 | void | |
690 | tape_free_request (struct tape_request * request) | |
691 | { | |
692 | DBF_LH(6, "Free request %p\n", request); | |
693 | ||
694 | if (request->device != NULL) { | |
695 | request->device = tape_put_device(request->device); | |
696 | } | |
17fd682e JJ |
697 | kfree(request->cpdata); |
698 | kfree(request->cpaddr); | |
1da177e4 LT |
699 | kfree(request); |
700 | } | |
701 | ||
4111796d SB |
702 | static inline int |
703 | __tape_start_io(struct tape_device *device, struct tape_request *request) | |
704 | { | |
705 | int rc; | |
706 | ||
707 | #ifdef CONFIG_S390_TAPE_BLOCK | |
708 | if (request->op == TO_BLOCK) | |
709 | device->discipline->check_locate(device, request); | |
710 | #endif | |
711 | rc = ccw_device_start( | |
712 | device->cdev, | |
713 | request->cpaddr, | |
714 | (unsigned long) request, | |
715 | 0x00, | |
716 | request->options | |
717 | ); | |
718 | if (rc == 0) { | |
719 | request->status = TAPE_REQUEST_IN_IO; | |
720 | } else if (rc == -EBUSY) { | |
721 | /* The common I/O subsystem is currently busy. Retry later. */ | |
722 | request->status = TAPE_REQUEST_QUEUED; | |
723 | schedule_work(&device->tape_dnr); | |
724 | rc = 0; | |
725 | } else { | |
726 | /* Start failed. Remove request and indicate failure. */ | |
727 | DBF_EVENT(1, "tape: start request failed with RC = %i\n", rc); | |
728 | } | |
729 | return rc; | |
730 | } | |
731 | ||
1da177e4 | 732 | static inline void |
4111796d | 733 | __tape_start_next_request(struct tape_device *device) |
1da177e4 LT |
734 | { |
735 | struct list_head *l, *n; | |
736 | struct tape_request *request; | |
737 | int rc; | |
738 | ||
4111796d | 739 | DBF_LH(6, "__tape_start_next_request(%p)\n", device); |
1da177e4 LT |
740 | /* |
741 | * Try to start each request on request queue until one is | |
742 | * started successful. | |
743 | */ | |
744 | list_for_each_safe(l, n, &device->req_queue) { | |
745 | request = list_entry(l, struct tape_request, list); | |
4111796d SB |
746 | |
747 | /* | |
748 | * Avoid race condition if bottom-half was triggered more than | |
749 | * once. | |
750 | */ | |
751 | if (request->status == TAPE_REQUEST_IN_IO) | |
752 | return; | |
5f384338 MH |
753 | /* |
754 | * Request has already been stopped. We have to wait until | |
755 | * the request is removed from the queue in the interrupt | |
756 | * handling. | |
757 | */ | |
758 | if (request->status == TAPE_REQUEST_DONE) | |
759 | return; | |
4111796d SB |
760 | |
761 | /* | |
762 | * We wanted to cancel the request but the common I/O layer | |
763 | * was busy at that time. This can only happen if this | |
764 | * function is called by delayed_next_request. | |
765 | * Otherwise we start the next request on the queue. | |
766 | */ | |
767 | if (request->status == TAPE_REQUEST_CANCEL) { | |
768 | rc = __tape_cancel_io(device, request); | |
769 | } else { | |
770 | rc = __tape_start_io(device, request); | |
1da177e4 | 771 | } |
4111796d SB |
772 | if (rc == 0) |
773 | return; | |
1da177e4 | 774 | |
4111796d | 775 | /* Set ending status. */ |
1da177e4 LT |
776 | request->rc = rc; |
777 | request->status = TAPE_REQUEST_DONE; | |
4111796d SB |
778 | |
779 | /* Remove from request queue. */ | |
780 | list_del(&request->list); | |
781 | ||
782 | /* Do callback. */ | |
783 | if (request->callback != NULL) | |
784 | request->callback(request, request->callback_data); | |
1da177e4 LT |
785 | } |
786 | } | |
787 | ||
788 | static void | |
4111796d | 789 | tape_delayed_next_request(void *data) |
1da177e4 | 790 | { |
4111796d | 791 | struct tape_device * device; |
1da177e4 | 792 | |
4111796d SB |
793 | device = (struct tape_device *) data; |
794 | DBF_LH(6, "tape_delayed_next_request(%p)\n", device); | |
795 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
796 | __tape_start_next_request(device); | |
797 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
798 | } | |
799 | ||
800 | static inline void | |
801 | __tape_end_request( | |
802 | struct tape_device * device, | |
803 | struct tape_request * request, | |
804 | int rc) | |
805 | { | |
806 | DBF_LH(6, "__tape_end_request(%p, %p, %i)\n", device, request, rc); | |
807 | if (request) { | |
808 | request->rc = rc; | |
809 | request->status = TAPE_REQUEST_DONE; | |
810 | ||
811 | /* Remove from request queue. */ | |
812 | list_del(&request->list); | |
813 | ||
814 | /* Do callback. */ | |
815 | if (request->callback != NULL) | |
816 | request->callback(request, request->callback_data); | |
817 | } | |
1da177e4 LT |
818 | |
819 | /* Start next request. */ | |
820 | if (!list_empty(&device->req_queue)) | |
4111796d | 821 | __tape_start_next_request(device); |
1da177e4 LT |
822 | } |
823 | ||
824 | /* | |
825 | * Write sense data to console/dbf | |
826 | */ | |
827 | void | |
828 | tape_dump_sense(struct tape_device* device, struct tape_request *request, | |
829 | struct irb *irb) | |
830 | { | |
831 | unsigned int *sptr; | |
832 | ||
833 | PRINT_INFO("-------------------------------------------------\n"); | |
834 | PRINT_INFO("DSTAT : %02x CSTAT: %02x CPA: %04x\n", | |
835 | irb->scsw.dstat, irb->scsw.cstat, irb->scsw.cpa); | |
836 | PRINT_INFO("DEVICE: %s\n", device->cdev->dev.bus_id); | |
837 | if (request != NULL) | |
838 | PRINT_INFO("OP : %s\n", tape_op_verbose[request->op]); | |
839 | ||
840 | sptr = (unsigned int *) irb->ecw; | |
841 | PRINT_INFO("Sense data: %08X %08X %08X %08X \n", | |
842 | sptr[0], sptr[1], sptr[2], sptr[3]); | |
843 | PRINT_INFO("Sense data: %08X %08X %08X %08X \n", | |
844 | sptr[4], sptr[5], sptr[6], sptr[7]); | |
845 | PRINT_INFO("--------------------------------------------------\n"); | |
846 | } | |
847 | ||
848 | /* | |
849 | * Write sense data to dbf | |
850 | */ | |
851 | void | |
852 | tape_dump_sense_dbf(struct tape_device *device, struct tape_request *request, | |
853 | struct irb *irb) | |
854 | { | |
855 | unsigned int *sptr; | |
856 | const char* op; | |
857 | ||
858 | if (request != NULL) | |
859 | op = tape_op_verbose[request->op]; | |
860 | else | |
861 | op = "---"; | |
862 | DBF_EVENT(3, "DSTAT : %02x CSTAT: %02x\n", | |
863 | irb->scsw.dstat,irb->scsw.cstat); | |
864 | DBF_EVENT(3, "DEVICE: %08x OP\t: %s\n", device->cdev_id, op); | |
865 | sptr = (unsigned int *) irb->ecw; | |
866 | DBF_EVENT(3, "%08x %08x\n", sptr[0], sptr[1]); | |
867 | DBF_EVENT(3, "%08x %08x\n", sptr[2], sptr[3]); | |
868 | DBF_EVENT(3, "%08x %08x\n", sptr[4], sptr[5]); | |
869 | DBF_EVENT(3, "%08x %08x\n", sptr[6], sptr[7]); | |
870 | } | |
871 | ||
872 | /* | |
873 | * I/O helper function. Adds the request to the request queue | |
874 | * and starts it if the tape is idle. Has to be called with | |
875 | * the device lock held. | |
876 | */ | |
877 | static inline int | |
4111796d | 878 | __tape_start_request(struct tape_device *device, struct tape_request *request) |
1da177e4 LT |
879 | { |
880 | int rc; | |
881 | ||
882 | switch (request->op) { | |
883 | case TO_MSEN: | |
884 | case TO_ASSIGN: | |
885 | case TO_UNASSIGN: | |
886 | case TO_READ_ATTMSG: | |
887 | if (device->tape_state == TS_INIT) | |
888 | break; | |
889 | if (device->tape_state == TS_UNUSED) | |
890 | break; | |
891 | default: | |
892 | if (device->tape_state == TS_BLKUSE) | |
893 | break; | |
894 | if (device->tape_state != TS_IN_USE) | |
895 | return -ENODEV; | |
896 | } | |
897 | ||
898 | /* Increase use count of device for the added request. */ | |
899 | request->device = tape_get_device_reference(device); | |
900 | ||
901 | if (list_empty(&device->req_queue)) { | |
902 | /* No other requests are on the queue. Start this one. */ | |
4111796d SB |
903 | rc = __tape_start_io(device, request); |
904 | if (rc) | |
1da177e4 | 905 | return rc; |
4111796d | 906 | |
1da177e4 LT |
907 | DBF_LH(5, "Request %p added for execution.\n", request); |
908 | list_add(&request->list, &device->req_queue); | |
1da177e4 LT |
909 | } else { |
910 | DBF_LH(5, "Request %p add to queue.\n", request); | |
1da177e4 | 911 | request->status = TAPE_REQUEST_QUEUED; |
4111796d | 912 | list_add_tail(&request->list, &device->req_queue); |
1da177e4 LT |
913 | } |
914 | return 0; | |
915 | } | |
916 | ||
917 | /* | |
918 | * Add the request to the request queue, try to start it if the | |
919 | * tape is idle. Return without waiting for end of i/o. | |
920 | */ | |
921 | int | |
922 | tape_do_io_async(struct tape_device *device, struct tape_request *request) | |
923 | { | |
924 | int rc; | |
925 | ||
926 | DBF_LH(6, "tape_do_io_async(%p, %p)\n", device, request); | |
927 | ||
928 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
929 | /* Add request to request queue and try to start it. */ | |
4111796d | 930 | rc = __tape_start_request(device, request); |
1da177e4 LT |
931 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
932 | return rc; | |
933 | } | |
934 | ||
935 | /* | |
936 | * tape_do_io/__tape_wake_up | |
937 | * Add the request to the request queue, try to start it if the | |
938 | * tape is idle and wait uninterruptible for its completion. | |
939 | */ | |
940 | static void | |
941 | __tape_wake_up(struct tape_request *request, void *data) | |
942 | { | |
943 | request->callback = NULL; | |
944 | wake_up((wait_queue_head_t *) data); | |
945 | } | |
946 | ||
947 | int | |
948 | tape_do_io(struct tape_device *device, struct tape_request *request) | |
949 | { | |
950 | wait_queue_head_t wq; | |
951 | int rc; | |
952 | ||
953 | init_waitqueue_head(&wq); | |
954 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
955 | /* Setup callback */ | |
956 | request->callback = __tape_wake_up; | |
957 | request->callback_data = &wq; | |
958 | /* Add request to request queue and try to start it. */ | |
4111796d | 959 | rc = __tape_start_request(device, request); |
1da177e4 LT |
960 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
961 | if (rc) | |
962 | return rc; | |
963 | /* Request added to the queue. Wait for its completion. */ | |
964 | wait_event(wq, (request->callback == NULL)); | |
965 | /* Get rc from request */ | |
966 | return request->rc; | |
967 | } | |
968 | ||
969 | /* | |
970 | * tape_do_io_interruptible/__tape_wake_up_interruptible | |
971 | * Add the request to the request queue, try to start it if the | |
972 | * tape is idle and wait uninterruptible for its completion. | |
973 | */ | |
974 | static void | |
975 | __tape_wake_up_interruptible(struct tape_request *request, void *data) | |
976 | { | |
977 | request->callback = NULL; | |
978 | wake_up_interruptible((wait_queue_head_t *) data); | |
979 | } | |
980 | ||
981 | int | |
982 | tape_do_io_interruptible(struct tape_device *device, | |
983 | struct tape_request *request) | |
984 | { | |
985 | wait_queue_head_t wq; | |
986 | int rc; | |
987 | ||
988 | init_waitqueue_head(&wq); | |
989 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
990 | /* Setup callback */ | |
991 | request->callback = __tape_wake_up_interruptible; | |
992 | request->callback_data = &wq; | |
4111796d | 993 | rc = __tape_start_request(device, request); |
1da177e4 LT |
994 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
995 | if (rc) | |
996 | return rc; | |
997 | /* Request added to the queue. Wait for its completion. */ | |
998 | rc = wait_event_interruptible(wq, (request->callback == NULL)); | |
999 | if (rc != -ERESTARTSYS) | |
1000 | /* Request finished normally. */ | |
1001 | return request->rc; | |
4111796d | 1002 | |
1da177e4 LT |
1003 | /* Interrupted by a signal. We have to stop the current request. */ |
1004 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
4111796d SB |
1005 | rc = __tape_cancel_io(device, request); |
1006 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 | 1007 | if (rc == 0) { |
4111796d SB |
1008 | /* Wait for the interrupt that acknowledges the halt. */ |
1009 | do { | |
1010 | rc = wait_event_interruptible( | |
1011 | wq, | |
1012 | (request->callback == NULL) | |
1013 | ); | |
4cd190a7 | 1014 | } while (rc == -ERESTARTSYS); |
4111796d | 1015 | |
1da177e4 LT |
1016 | DBF_EVENT(3, "IO stopped on %08x\n", device->cdev_id); |
1017 | rc = -ERESTARTSYS; | |
1018 | } | |
1da177e4 LT |
1019 | return rc; |
1020 | } | |
1021 | ||
5f384338 MH |
1022 | /* |
1023 | * Stop running ccw. | |
1024 | */ | |
1025 | int | |
1026 | tape_cancel_io(struct tape_device *device, struct tape_request *request) | |
1027 | { | |
1028 | int rc; | |
1029 | ||
1030 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1031 | rc = __tape_cancel_io(device, request); | |
1032 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1033 | return rc; | |
1034 | } | |
1035 | ||
1da177e4 LT |
1036 | /* |
1037 | * Tape interrupt routine, called from the ccw_device layer | |
1038 | */ | |
1039 | static void | |
1040 | __tape_do_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb) | |
1041 | { | |
1042 | struct tape_device *device; | |
1043 | struct tape_request *request; | |
1da177e4 LT |
1044 | int rc; |
1045 | ||
1046 | device = (struct tape_device *) cdev->dev.driver_data; | |
1047 | if (device == NULL) { | |
1048 | PRINT_ERR("could not get device structure for %s " | |
1049 | "in interrupt\n", cdev->dev.bus_id); | |
1050 | return; | |
1051 | } | |
1052 | request = (struct tape_request *) intparm; | |
1053 | ||
1054 | DBF_LH(6, "__tape_do_irq(device=%p, request=%p)\n", device, request); | |
1055 | ||
1056 | /* On special conditions irb is an error pointer */ | |
1057 | if (IS_ERR(irb)) { | |
4111796d | 1058 | /* FIXME: What to do with the request? */ |
1da177e4 LT |
1059 | switch (PTR_ERR(irb)) { |
1060 | case -ETIMEDOUT: | |
1061 | PRINT_WARN("(%s): Request timed out\n", | |
1062 | cdev->dev.bus_id); | |
1063 | case -EIO: | |
4111796d | 1064 | __tape_end_request(device, request, -EIO); |
1da177e4 LT |
1065 | break; |
1066 | default: | |
1067 | PRINT_ERR("(%s): Unexpected i/o error %li\n", | |
1068 | cdev->dev.bus_id, | |
1069 | PTR_ERR(irb)); | |
1070 | } | |
1071 | return; | |
1072 | } | |
1073 | ||
4111796d SB |
1074 | /* |
1075 | * If the condition code is not zero and the start function bit is | |
1076 | * still set, this is an deferred error and the last start I/O did | |
842d3fba SB |
1077 | * not succeed. At this point the condition that caused the deferred |
1078 | * error might still apply. So we just schedule the request to be | |
1079 | * started later. | |
4111796d | 1080 | */ |
5f384338 MH |
1081 | if (irb->scsw.cc != 0 && (irb->scsw.fctl & SCSW_FCTL_START_FUNC) && |
1082 | (request->status == TAPE_REQUEST_IN_IO)) { | |
1083 | DBF_EVENT(3,"(%08x): deferred cc=%i, fctl=%i. restarting\n", | |
1084 | device->cdev_id, irb->scsw.cc, irb->scsw.fctl); | |
842d3fba | 1085 | request->status = TAPE_REQUEST_QUEUED; |
5f384338 | 1086 | schedule_delayed_work(&device->tape_dnr, HZ); |
4111796d SB |
1087 | return; |
1088 | } | |
1089 | ||
1da177e4 LT |
1090 | /* May be an unsolicited irq */ |
1091 | if(request != NULL) | |
1092 | request->rescnt = irb->scsw.count; | |
1093 | ||
1094 | if (irb->scsw.dstat != 0x0c) { | |
1095 | /* Set the 'ONLINE' flag depending on sense byte 1 */ | |
1096 | if(*(((__u8 *) irb->ecw) + 1) & SENSE_DRIVE_ONLINE) | |
1097 | device->tape_generic_status |= GMT_ONLINE(~0); | |
1098 | else | |
1099 | device->tape_generic_status &= ~GMT_ONLINE(~0); | |
1100 | ||
1101 | /* | |
1102 | * Any request that does not come back with channel end | |
1103 | * and device end is unusual. Log the sense data. | |
1104 | */ | |
1105 | DBF_EVENT(3,"-- Tape Interrupthandler --\n"); | |
1106 | tape_dump_sense_dbf(device, request, irb); | |
1107 | } else { | |
1108 | /* Upon normal completion the device _is_ online */ | |
1109 | device->tape_generic_status |= GMT_ONLINE(~0); | |
1110 | } | |
1111 | if (device->tape_state == TS_NOT_OPER) { | |
1112 | DBF_EVENT(6, "tape:device is not operational\n"); | |
1113 | return; | |
1114 | } | |
1115 | ||
1116 | /* | |
1117 | * Request that were canceled still come back with an interrupt. | |
1118 | * To detect these request the state will be set to TAPE_REQUEST_DONE. | |
1119 | */ | |
1120 | if(request != NULL && request->status == TAPE_REQUEST_DONE) { | |
4111796d | 1121 | __tape_end_request(device, request, -EIO); |
1da177e4 LT |
1122 | return; |
1123 | } | |
1124 | ||
1125 | rc = device->discipline->irq(device, request, irb); | |
1126 | /* | |
1127 | * rc < 0 : request finished unsuccessfully. | |
1128 | * rc == TAPE_IO_SUCCESS: request finished successfully. | |
1129 | * rc == TAPE_IO_PENDING: request is still running. Ignore rc. | |
1130 | * rc == TAPE_IO_RETRY: request finished but needs another go. | |
1131 | * rc == TAPE_IO_STOP: request needs to get terminated. | |
1132 | */ | |
1da177e4 | 1133 | switch (rc) { |
4111796d SB |
1134 | case TAPE_IO_SUCCESS: |
1135 | /* Upon normal completion the device _is_ online */ | |
1136 | device->tape_generic_status |= GMT_ONLINE(~0); | |
1137 | __tape_end_request(device, request, rc); | |
1138 | break; | |
1139 | case TAPE_IO_PENDING: | |
1140 | break; | |
1141 | case TAPE_IO_RETRY: | |
1142 | rc = __tape_start_io(device, request); | |
1143 | if (rc) | |
1144 | __tape_end_request(device, request, rc); | |
1145 | break; | |
1146 | case TAPE_IO_STOP: | |
1147 | rc = __tape_cancel_io(device, request); | |
1148 | if (rc) | |
1149 | __tape_end_request(device, request, rc); | |
1150 | break; | |
1151 | default: | |
1152 | if (rc > 0) { | |
1153 | DBF_EVENT(6, "xunknownrc\n"); | |
1154 | PRINT_ERR("Invalid return code from discipline " | |
1155 | "interrupt function.\n"); | |
1156 | __tape_end_request(device, request, -EIO); | |
1157 | } else { | |
1158 | __tape_end_request(device, request, rc); | |
1159 | } | |
1160 | break; | |
1da177e4 LT |
1161 | } |
1162 | } | |
1163 | ||
1164 | /* | |
1165 | * Tape device open function used by tape_char & tape_block frontends. | |
1166 | */ | |
1167 | int | |
1168 | tape_open(struct tape_device *device) | |
1169 | { | |
1170 | int rc; | |
1171 | ||
1172 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1173 | if (device->tape_state == TS_NOT_OPER) { | |
1174 | DBF_EVENT(6, "TAPE:nodev\n"); | |
1175 | rc = -ENODEV; | |
1176 | } else if (device->tape_state == TS_IN_USE) { | |
1177 | DBF_EVENT(6, "TAPE:dbusy\n"); | |
1178 | rc = -EBUSY; | |
1179 | } else if (device->tape_state == TS_BLKUSE) { | |
1180 | DBF_EVENT(6, "TAPE:dbusy\n"); | |
1181 | rc = -EBUSY; | |
1182 | } else if (device->discipline != NULL && | |
1183 | !try_module_get(device->discipline->owner)) { | |
1184 | DBF_EVENT(6, "TAPE:nodisc\n"); | |
1185 | rc = -ENODEV; | |
1186 | } else { | |
1187 | tape_state_set(device, TS_IN_USE); | |
1188 | rc = 0; | |
1189 | } | |
1190 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1191 | return rc; | |
1192 | } | |
1193 | ||
1194 | /* | |
1195 | * Tape device release function used by tape_char & tape_block frontends. | |
1196 | */ | |
1197 | int | |
1198 | tape_release(struct tape_device *device) | |
1199 | { | |
1200 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1201 | if (device->tape_state == TS_IN_USE) | |
1202 | tape_state_set(device, TS_UNUSED); | |
1203 | module_put(device->discipline->owner); | |
1204 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1205 | return 0; | |
1206 | } | |
1207 | ||
1208 | /* | |
1209 | * Execute a magnetic tape command a number of times. | |
1210 | */ | |
1211 | int | |
1212 | tape_mtop(struct tape_device *device, int mt_op, int mt_count) | |
1213 | { | |
1214 | tape_mtop_fn fn; | |
1215 | int rc; | |
1216 | ||
1217 | DBF_EVENT(6, "TAPE:mtio\n"); | |
1218 | DBF_EVENT(6, "TAPE:ioop: %x\n", mt_op); | |
1219 | DBF_EVENT(6, "TAPE:arg: %x\n", mt_count); | |
1220 | ||
1221 | if (mt_op < 0 || mt_op >= TAPE_NR_MTOPS) | |
1222 | return -EINVAL; | |
1223 | fn = device->discipline->mtop_array[mt_op]; | |
1224 | if (fn == NULL) | |
1225 | return -EINVAL; | |
1226 | ||
1227 | /* We assume that the backends can handle count up to 500. */ | |
1228 | if (mt_op == MTBSR || mt_op == MTFSR || mt_op == MTFSF || | |
1229 | mt_op == MTBSF || mt_op == MTFSFM || mt_op == MTBSFM) { | |
1230 | rc = 0; | |
1231 | for (; mt_count > 500; mt_count -= 500) | |
1232 | if ((rc = fn(device, 500)) != 0) | |
1233 | break; | |
1234 | if (rc == 0) | |
1235 | rc = fn(device, mt_count); | |
1236 | } else | |
1237 | rc = fn(device, mt_count); | |
1238 | return rc; | |
1239 | ||
1240 | } | |
1241 | ||
1242 | /* | |
1243 | * Tape init function. | |
1244 | */ | |
1245 | static int | |
1246 | tape_init (void) | |
1247 | { | |
66a464db | 1248 | TAPE_DBF_AREA = debug_register ( "tape", 2, 2, 4*sizeof(long)); |
1da177e4 LT |
1249 | debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view); |
1250 | #ifdef DBF_LIKE_HELL | |
1251 | debug_set_level(TAPE_DBF_AREA, 6); | |
1252 | #endif | |
e018ba1f | 1253 | DBF_EVENT(3, "tape init\n"); |
1da177e4 LT |
1254 | tape_proc_init(); |
1255 | tapechar_init (); | |
1256 | tapeblock_init (); | |
1257 | return 0; | |
1258 | } | |
1259 | ||
1260 | /* | |
1261 | * Tape exit function. | |
1262 | */ | |
1263 | static void | |
1264 | tape_exit(void) | |
1265 | { | |
1266 | DBF_EVENT(6, "tape exit\n"); | |
1267 | ||
1268 | /* Get rid of the frontends */ | |
1269 | tapechar_exit(); | |
1270 | tapeblock_exit(); | |
1271 | tape_proc_cleanup(); | |
1272 | debug_unregister (TAPE_DBF_AREA); | |
1273 | } | |
1274 | ||
1275 | MODULE_AUTHOR("(C) 2001 IBM Deutschland Entwicklung GmbH by Carsten Otte and " | |
1276 | "Michael Holzheu (cotte@de.ibm.com,holzheu@de.ibm.com)"); | |
e018ba1f | 1277 | MODULE_DESCRIPTION("Linux on zSeries channel attached tape device driver"); |
1da177e4 LT |
1278 | MODULE_LICENSE("GPL"); |
1279 | ||
1280 | module_init(tape_init); | |
1281 | module_exit(tape_exit); | |
1282 | ||
1283 | EXPORT_SYMBOL(tape_generic_remove); | |
1284 | EXPORT_SYMBOL(tape_generic_probe); | |
1285 | EXPORT_SYMBOL(tape_generic_online); | |
1286 | EXPORT_SYMBOL(tape_generic_offline); | |
1287 | EXPORT_SYMBOL(tape_put_device); | |
1288 | EXPORT_SYMBOL(tape_get_device_reference); | |
1289 | EXPORT_SYMBOL(tape_state_verbose); | |
1290 | EXPORT_SYMBOL(tape_op_verbose); | |
1291 | EXPORT_SYMBOL(tape_state_set); | |
1292 | EXPORT_SYMBOL(tape_med_state_set); | |
1293 | EXPORT_SYMBOL(tape_alloc_request); | |
1294 | EXPORT_SYMBOL(tape_free_request); | |
1295 | EXPORT_SYMBOL(tape_dump_sense); | |
1296 | EXPORT_SYMBOL(tape_dump_sense_dbf); | |
1297 | EXPORT_SYMBOL(tape_do_io); | |
1298 | EXPORT_SYMBOL(tape_do_io_async); | |
1299 | EXPORT_SYMBOL(tape_do_io_interruptible); | |
5f384338 | 1300 | EXPORT_SYMBOL(tape_cancel_io); |
1da177e4 | 1301 | EXPORT_SYMBOL(tape_mtop); |