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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 | |
cced1dd4 | 6 | * Copyright IBM Corp. 2001,2006 |
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 | ||
ab640db0 | 14 | #define KMSG_COMPONENT "tape" |
1da177e4 LT |
15 | #include <linux/module.h> |
16 | #include <linux/init.h> // for kernel parameters | |
17 | #include <linux/kmod.h> // for requesting modules | |
18 | #include <linux/spinlock.h> // for locks | |
19 | #include <linux/vmalloc.h> | |
20 | #include <linux/list.h> | |
21 | ||
22 | #include <asm/types.h> // for variable types | |
23 | ||
24 | #define TAPE_DBF_AREA tape_core_dbf | |
25 | ||
26 | #include "tape.h" | |
27 | #include "tape_std.h" | |
28 | ||
cced1dd4 | 29 | #define LONG_BUSY_TIMEOUT 180 /* seconds */ |
1da177e4 LT |
30 | |
31 | static void __tape_do_irq (struct ccw_device *, unsigned long, struct irb *); | |
c1637532 | 32 | static void tape_delayed_next_request(struct work_struct *); |
cced1dd4 | 33 | static void tape_long_busy_timeout(unsigned long data); |
1da177e4 LT |
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 | */ | |
c11ca97e | 40 | static LIST_HEAD(tape_device_list); |
1da177e4 LT |
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", | |
cced1dd4 MH |
74 | [TO_UNASSIGN] = "UAS", [TO_CRYPT_ON] = "CON", |
75 | [TO_CRYPT_OFF] = "COF", [TO_KEKL_SET] = "KLS", | |
e2963062 | 76 | [TO_KEKL_QUERY] = "KLQ",[TO_RDC] = "RDC", |
1da177e4 LT |
77 | }; |
78 | ||
f455adcf | 79 | static int devid_to_int(struct ccw_dev_id *dev_id) |
1da177e4 | 80 | { |
f455adcf | 81 | return dev_id->devno + (dev_id->ssid << 16); |
1da177e4 LT |
82 | } |
83 | ||
84 | /* | |
85 | * Some channel attached tape specific attributes. | |
86 | * | |
87 | * FIXME: In the future the first_minor and blocksize attribute should be | |
88 | * replaced by a link to the cdev tree. | |
89 | */ | |
90 | static ssize_t | |
3fd3c0a5 | 91 | tape_medium_state_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
92 | { |
93 | struct tape_device *tdev; | |
94 | ||
95 | tdev = (struct tape_device *) dev->driver_data; | |
96 | return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->medium_state); | |
97 | } | |
98 | ||
99 | static | |
100 | DEVICE_ATTR(medium_state, 0444, tape_medium_state_show, NULL); | |
101 | ||
102 | static ssize_t | |
3fd3c0a5 | 103 | tape_first_minor_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
104 | { |
105 | struct tape_device *tdev; | |
106 | ||
107 | tdev = (struct tape_device *) dev->driver_data; | |
108 | return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->first_minor); | |
109 | } | |
110 | ||
111 | static | |
112 | DEVICE_ATTR(first_minor, 0444, tape_first_minor_show, NULL); | |
113 | ||
114 | static ssize_t | |
3fd3c0a5 | 115 | tape_state_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
116 | { |
117 | struct tape_device *tdev; | |
118 | ||
119 | tdev = (struct tape_device *) dev->driver_data; | |
120 | return scnprintf(buf, PAGE_SIZE, "%s\n", (tdev->first_minor < 0) ? | |
121 | "OFFLINE" : tape_state_verbose[tdev->tape_state]); | |
122 | } | |
123 | ||
124 | static | |
125 | DEVICE_ATTR(state, 0444, tape_state_show, NULL); | |
126 | ||
127 | static ssize_t | |
3fd3c0a5 | 128 | tape_operation_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
129 | { |
130 | struct tape_device *tdev; | |
131 | ssize_t rc; | |
132 | ||
133 | tdev = (struct tape_device *) dev->driver_data; | |
134 | if (tdev->first_minor < 0) | |
135 | return scnprintf(buf, PAGE_SIZE, "N/A\n"); | |
136 | ||
137 | spin_lock_irq(get_ccwdev_lock(tdev->cdev)); | |
138 | if (list_empty(&tdev->req_queue)) | |
139 | rc = scnprintf(buf, PAGE_SIZE, "---\n"); | |
140 | else { | |
141 | struct tape_request *req; | |
142 | ||
143 | req = list_entry(tdev->req_queue.next, struct tape_request, | |
144 | list); | |
145 | rc = scnprintf(buf,PAGE_SIZE, "%s\n", tape_op_verbose[req->op]); | |
146 | } | |
147 | spin_unlock_irq(get_ccwdev_lock(tdev->cdev)); | |
148 | return rc; | |
149 | } | |
150 | ||
151 | static | |
152 | DEVICE_ATTR(operation, 0444, tape_operation_show, NULL); | |
153 | ||
154 | static ssize_t | |
3fd3c0a5 | 155 | tape_blocksize_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
156 | { |
157 | struct tape_device *tdev; | |
158 | ||
159 | tdev = (struct tape_device *) dev->driver_data; | |
160 | ||
161 | return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->char_data.block_size); | |
162 | } | |
163 | ||
164 | static | |
165 | DEVICE_ATTR(blocksize, 0444, tape_blocksize_show, NULL); | |
166 | ||
167 | static struct attribute *tape_attrs[] = { | |
168 | &dev_attr_medium_state.attr, | |
169 | &dev_attr_first_minor.attr, | |
170 | &dev_attr_state.attr, | |
171 | &dev_attr_operation.attr, | |
172 | &dev_attr_blocksize.attr, | |
173 | NULL | |
174 | }; | |
175 | ||
176 | static struct attribute_group tape_attr_group = { | |
177 | .attrs = tape_attrs, | |
178 | }; | |
179 | ||
180 | /* | |
181 | * Tape state functions | |
182 | */ | |
183 | void | |
184 | tape_state_set(struct tape_device *device, enum tape_state newstate) | |
185 | { | |
186 | const char *str; | |
187 | ||
188 | if (device->tape_state == TS_NOT_OPER) { | |
189 | DBF_EVENT(3, "ts_set err: not oper\n"); | |
190 | return; | |
191 | } | |
192 | DBF_EVENT(4, "ts. dev: %x\n", device->first_minor); | |
f976069a PO |
193 | DBF_EVENT(4, "old ts:\t\n"); |
194 | if (device->tape_state < TS_SIZE && device->tape_state >=0 ) | |
1da177e4 LT |
195 | str = tape_state_verbose[device->tape_state]; |
196 | else | |
197 | str = "UNKNOWN TS"; | |
198 | DBF_EVENT(4, "%s\n", str); | |
199 | DBF_EVENT(4, "new ts:\t\n"); | |
f976069a | 200 | if (newstate < TS_SIZE && newstate >= 0) |
1da177e4 LT |
201 | str = tape_state_verbose[newstate]; |
202 | else | |
203 | str = "UNKNOWN TS"; | |
204 | DBF_EVENT(4, "%s\n", str); | |
205 | device->tape_state = newstate; | |
206 | wake_up(&device->state_change_wq); | |
207 | } | |
208 | ||
209 | void | |
210 | tape_med_state_set(struct tape_device *device, enum tape_medium_state newstate) | |
211 | { | |
212 | if (device->medium_state == newstate) | |
213 | return; | |
214 | switch(newstate){ | |
215 | case MS_UNLOADED: | |
216 | device->tape_generic_status |= GMT_DR_OPEN(~0); | |
ab640db0 CO |
217 | dev_info(&device->cdev->dev, "The tape cartridge has been " |
218 | "successfully unloaded\n"); | |
1da177e4 LT |
219 | break; |
220 | case MS_LOADED: | |
221 | device->tape_generic_status &= ~GMT_DR_OPEN(~0); | |
ab640db0 CO |
222 | dev_info(&device->cdev->dev, "A tape cartridge has been " |
223 | "mounted\n"); | |
1da177e4 LT |
224 | break; |
225 | default: | |
226 | // print nothing | |
227 | break; | |
228 | } | |
229 | device->medium_state = newstate; | |
230 | wake_up(&device->state_change_wq); | |
231 | } | |
232 | ||
233 | /* | |
234 | * Stop running ccw. Has to be called with the device lock held. | |
235 | */ | |
4d284cac | 236 | static int |
4111796d | 237 | __tape_cancel_io(struct tape_device *device, struct tape_request *request) |
1da177e4 LT |
238 | { |
239 | int retries; | |
240 | int rc; | |
241 | ||
242 | /* Check if interrupt has already been processed */ | |
243 | if (request->callback == NULL) | |
244 | return 0; | |
245 | ||
246 | rc = 0; | |
247 | for (retries = 0; retries < 5; retries++) { | |
248 | rc = ccw_device_clear(device->cdev, (long) request); | |
249 | ||
4111796d SB |
250 | switch (rc) { |
251 | case 0: | |
252 | request->status = TAPE_REQUEST_DONE; | |
253 | return 0; | |
254 | case -EBUSY: | |
255 | request->status = TAPE_REQUEST_CANCEL; | |
c1637532 | 256 | schedule_delayed_work(&device->tape_dnr, 0); |
4111796d SB |
257 | return 0; |
258 | case -ENODEV: | |
259 | DBF_EXCEPTION(2, "device gone, retry\n"); | |
260 | break; | |
261 | case -EIO: | |
262 | DBF_EXCEPTION(2, "I/O error, retry\n"); | |
263 | break; | |
264 | default: | |
265 | BUG(); | |
1da177e4 | 266 | } |
1da177e4 LT |
267 | } |
268 | ||
269 | return rc; | |
270 | } | |
271 | ||
272 | /* | |
273 | * Add device into the sorted list, giving it the first | |
274 | * available minor number. | |
275 | */ | |
276 | static int | |
277 | tape_assign_minor(struct tape_device *device) | |
278 | { | |
279 | struct tape_device *tmp; | |
280 | int minor; | |
281 | ||
282 | minor = 0; | |
283 | write_lock(&tape_device_lock); | |
284 | list_for_each_entry(tmp, &tape_device_list, node) { | |
285 | if (minor < tmp->first_minor) | |
286 | break; | |
287 | minor += TAPE_MINORS_PER_DEV; | |
288 | } | |
289 | if (minor >= 256) { | |
290 | write_unlock(&tape_device_lock); | |
291 | return -ENODEV; | |
292 | } | |
293 | device->first_minor = minor; | |
294 | list_add_tail(&device->node, &tmp->node); | |
295 | write_unlock(&tape_device_lock); | |
296 | return 0; | |
297 | } | |
298 | ||
299 | /* remove device from the list */ | |
300 | static void | |
301 | tape_remove_minor(struct tape_device *device) | |
302 | { | |
303 | write_lock(&tape_device_lock); | |
304 | list_del_init(&device->node); | |
305 | device->first_minor = -1; | |
306 | write_unlock(&tape_device_lock); | |
307 | } | |
308 | ||
309 | /* | |
310 | * Set a device online. | |
311 | * | |
312 | * This function is called by the common I/O layer to move a device from the | |
313 | * detected but offline into the online state. | |
314 | * If we return an error (RC < 0) the device remains in the offline state. This | |
315 | * can happen if the device is assigned somewhere else, for example. | |
316 | */ | |
317 | int | |
318 | tape_generic_online(struct tape_device *device, | |
319 | struct tape_discipline *discipline) | |
320 | { | |
321 | int rc; | |
322 | ||
323 | DBF_LH(6, "tape_enable_device(%p, %p)\n", device, discipline); | |
324 | ||
325 | if (device->tape_state != TS_INIT) { | |
326 | DBF_LH(3, "Tapestate not INIT (%d)\n", device->tape_state); | |
327 | return -EINVAL; | |
328 | } | |
329 | ||
cced1dd4 MH |
330 | init_timer(&device->lb_timeout); |
331 | device->lb_timeout.function = tape_long_busy_timeout; | |
332 | ||
1da177e4 LT |
333 | /* Let the discipline have a go at the device. */ |
334 | device->discipline = discipline; | |
335 | if (!try_module_get(discipline->owner)) { | |
1da177e4 LT |
336 | return -EINVAL; |
337 | } | |
338 | ||
339 | rc = discipline->setup_device(device); | |
340 | if (rc) | |
341 | goto out; | |
342 | rc = tape_assign_minor(device); | |
343 | if (rc) | |
344 | goto out_discipline; | |
345 | ||
346 | rc = tapechar_setup_device(device); | |
347 | if (rc) | |
348 | goto out_minor; | |
349 | rc = tapeblock_setup_device(device); | |
350 | if (rc) | |
351 | goto out_char; | |
352 | ||
353 | tape_state_set(device, TS_UNUSED); | |
354 | ||
355 | DBF_LH(3, "(%08x): Drive set online\n", device->cdev_id); | |
356 | ||
357 | return 0; | |
358 | ||
359 | out_char: | |
360 | tapechar_cleanup_device(device); | |
361 | out_discipline: | |
362 | device->discipline->cleanup_device(device); | |
363 | device->discipline = NULL; | |
364 | out_minor: | |
365 | tape_remove_minor(device); | |
366 | out: | |
367 | module_put(discipline->owner); | |
368 | return rc; | |
369 | } | |
370 | ||
4d284cac | 371 | static void |
1da177e4 LT |
372 | tape_cleanup_device(struct tape_device *device) |
373 | { | |
374 | tapeblock_cleanup_device(device); | |
375 | tapechar_cleanup_device(device); | |
376 | device->discipline->cleanup_device(device); | |
377 | module_put(device->discipline->owner); | |
378 | tape_remove_minor(device); | |
379 | tape_med_state_set(device, MS_UNKNOWN); | |
380 | } | |
381 | ||
382 | /* | |
383 | * Set device offline. | |
384 | * | |
385 | * Called by the common I/O layer if the drive should set offline on user | |
386 | * request. We may prevent this by returning an error. | |
387 | * Manual offline is only allowed while the drive is not in use. | |
388 | */ | |
389 | int | |
4d7a3cdf | 390 | tape_generic_offline(struct ccw_device *cdev) |
1da177e4 | 391 | { |
4d7a3cdf FM |
392 | struct tape_device *device; |
393 | ||
394 | device = cdev->dev.driver_data; | |
1da177e4 | 395 | if (!device) { |
1da177e4 LT |
396 | return -ENODEV; |
397 | } | |
398 | ||
399 | DBF_LH(3, "(%08x): tape_generic_offline(%p)\n", | |
400 | device->cdev_id, device); | |
401 | ||
402 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
403 | switch (device->tape_state) { | |
404 | case TS_INIT: | |
405 | case TS_NOT_OPER: | |
406 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
407 | break; | |
408 | case TS_UNUSED: | |
409 | tape_state_set(device, TS_INIT); | |
410 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
411 | tape_cleanup_device(device); | |
412 | break; | |
413 | default: | |
414 | DBF_EVENT(3, "(%08x): Set offline failed " | |
415 | "- drive in use.\n", | |
416 | device->cdev_id); | |
1da177e4 LT |
417 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
418 | return -EBUSY; | |
419 | } | |
420 | ||
421 | DBF_LH(3, "(%08x): Drive set offline.\n", device->cdev_id); | |
422 | return 0; | |
423 | } | |
424 | ||
425 | /* | |
426 | * Allocate memory for a new device structure. | |
427 | */ | |
428 | static struct tape_device * | |
429 | tape_alloc_device(void) | |
430 | { | |
431 | struct tape_device *device; | |
432 | ||
88abaab4 | 433 | device = kzalloc(sizeof(struct tape_device), GFP_KERNEL); |
1da177e4 LT |
434 | if (device == NULL) { |
435 | DBF_EXCEPTION(2, "ti:no mem\n"); | |
1da177e4 LT |
436 | return ERR_PTR(-ENOMEM); |
437 | } | |
88abaab4 | 438 | device->modeset_byte = kmalloc(1, GFP_KERNEL | GFP_DMA); |
1da177e4 LT |
439 | if (device->modeset_byte == NULL) { |
440 | DBF_EXCEPTION(2, "ti:no mem\n"); | |
1da177e4 LT |
441 | kfree(device); |
442 | return ERR_PTR(-ENOMEM); | |
443 | } | |
444 | INIT_LIST_HEAD(&device->req_queue); | |
445 | INIT_LIST_HEAD(&device->node); | |
446 | init_waitqueue_head(&device->state_change_wq); | |
4657fb8a | 447 | init_waitqueue_head(&device->wait_queue); |
1da177e4 LT |
448 | device->tape_state = TS_INIT; |
449 | device->medium_state = MS_UNKNOWN; | |
450 | *device->modeset_byte = 0; | |
451 | device->first_minor = -1; | |
452 | atomic_set(&device->ref_count, 1); | |
c1637532 | 453 | INIT_DELAYED_WORK(&device->tape_dnr, tape_delayed_next_request); |
1da177e4 LT |
454 | |
455 | return device; | |
456 | } | |
457 | ||
458 | /* | |
459 | * Get a reference to an existing device structure. This will automatically | |
460 | * increment the reference count. | |
461 | */ | |
462 | struct tape_device * | |
463 | tape_get_device_reference(struct tape_device *device) | |
464 | { | |
465 | DBF_EVENT(4, "tape_get_device_reference(%p) = %i\n", device, | |
466 | atomic_inc_return(&device->ref_count)); | |
467 | ||
468 | return device; | |
469 | } | |
470 | ||
471 | /* | |
472 | * Decrease the reference counter of a devices structure. If the | |
473 | * reference counter reaches zero free the device structure. | |
474 | * The function returns a NULL pointer to be used by the caller | |
475 | * for clearing reference pointers. | |
476 | */ | |
477 | struct tape_device * | |
478 | tape_put_device(struct tape_device *device) | |
479 | { | |
480 | int remain; | |
481 | ||
482 | remain = atomic_dec_return(&device->ref_count); | |
483 | if (remain > 0) { | |
484 | DBF_EVENT(4, "tape_put_device(%p) -> %i\n", device, remain); | |
485 | } else { | |
486 | if (remain < 0) { | |
487 | DBF_EVENT(4, "put device without reference\n"); | |
1da177e4 LT |
488 | } else { |
489 | DBF_EVENT(4, "tape_free_device(%p)\n", device); | |
490 | kfree(device->modeset_byte); | |
491 | kfree(device); | |
492 | } | |
493 | } | |
494 | ||
495 | return NULL; | |
496 | } | |
497 | ||
498 | /* | |
499 | * Find tape device by a device index. | |
500 | */ | |
501 | struct tape_device * | |
502 | tape_get_device(int devindex) | |
503 | { | |
504 | struct tape_device *device, *tmp; | |
505 | ||
506 | device = ERR_PTR(-ENODEV); | |
507 | read_lock(&tape_device_lock); | |
508 | list_for_each_entry(tmp, &tape_device_list, node) { | |
509 | if (tmp->first_minor / TAPE_MINORS_PER_DEV == devindex) { | |
510 | device = tape_get_device_reference(tmp); | |
511 | break; | |
512 | } | |
513 | } | |
514 | read_unlock(&tape_device_lock); | |
515 | return device; | |
516 | } | |
517 | ||
518 | /* | |
519 | * Driverfs tape probe function. | |
520 | */ | |
521 | int | |
522 | tape_generic_probe(struct ccw_device *cdev) | |
523 | { | |
524 | struct tape_device *device; | |
d7cf0d57 | 525 | int ret; |
f455adcf | 526 | struct ccw_dev_id dev_id; |
1da177e4 LT |
527 | |
528 | device = tape_alloc_device(); | |
529 | if (IS_ERR(device)) | |
530 | return -ENODEV; | |
d7cf0d57 HC |
531 | ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP); |
532 | ret = sysfs_create_group(&cdev->dev.kobj, &tape_attr_group); | |
533 | if (ret) { | |
534 | tape_put_device(device); | |
d7cf0d57 HC |
535 | return ret; |
536 | } | |
1da177e4 | 537 | cdev->dev.driver_data = device; |
d7cf0d57 | 538 | cdev->handler = __tape_do_irq; |
1da177e4 | 539 | device->cdev = cdev; |
f455adcf CH |
540 | ccw_device_get_id(cdev, &dev_id); |
541 | device->cdev_id = devid_to_int(&dev_id); | |
d7cf0d57 | 542 | return ret; |
1da177e4 LT |
543 | } |
544 | ||
4d284cac | 545 | static void |
1da177e4 LT |
546 | __tape_discard_requests(struct tape_device *device) |
547 | { | |
548 | struct tape_request * request; | |
549 | struct list_head * l, *n; | |
550 | ||
551 | list_for_each_safe(l, n, &device->req_queue) { | |
552 | request = list_entry(l, struct tape_request, list); | |
553 | if (request->status == TAPE_REQUEST_IN_IO) | |
554 | request->status = TAPE_REQUEST_DONE; | |
555 | list_del(&request->list); | |
556 | ||
557 | /* Decrease ref_count for removed request. */ | |
558 | request->device = tape_put_device(device); | |
559 | request->rc = -EIO; | |
560 | if (request->callback != NULL) | |
561 | request->callback(request, request->callback_data); | |
562 | } | |
563 | } | |
564 | ||
565 | /* | |
566 | * Driverfs tape remove function. | |
567 | * | |
568 | * This function is called whenever the common I/O layer detects the device | |
569 | * gone. This can happen at any time and we cannot refuse. | |
570 | */ | |
571 | void | |
572 | tape_generic_remove(struct ccw_device *cdev) | |
573 | { | |
574 | struct tape_device * device; | |
575 | ||
576 | device = cdev->dev.driver_data; | |
577 | if (!device) { | |
1da177e4 LT |
578 | return; |
579 | } | |
580 | DBF_LH(3, "(%08x): tape_generic_remove(%p)\n", device->cdev_id, cdev); | |
581 | ||
582 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
583 | switch (device->tape_state) { | |
584 | case TS_INIT: | |
585 | tape_state_set(device, TS_NOT_OPER); | |
586 | case TS_NOT_OPER: | |
587 | /* | |
588 | * Nothing to do. | |
589 | */ | |
590 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
591 | break; | |
592 | case TS_UNUSED: | |
593 | /* | |
594 | * Need only to release the device. | |
595 | */ | |
596 | tape_state_set(device, TS_NOT_OPER); | |
597 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
598 | tape_cleanup_device(device); | |
599 | break; | |
600 | default: | |
601 | /* | |
602 | * There may be requests on the queue. We will not get | |
603 | * an interrupt for a request that was running. So we | |
604 | * just post them all as I/O errors. | |
605 | */ | |
606 | DBF_EVENT(3, "(%08x): Drive in use vanished!\n", | |
607 | device->cdev_id); | |
ab640db0 CO |
608 | dev_warn(&device->cdev->dev, "A tape unit was detached" |
609 | " while in use\n"); | |
1da177e4 LT |
610 | tape_state_set(device, TS_NOT_OPER); |
611 | __tape_discard_requests(device); | |
612 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
613 | tape_cleanup_device(device); | |
614 | } | |
615 | ||
616 | if (cdev->dev.driver_data != NULL) { | |
617 | sysfs_remove_group(&cdev->dev.kobj, &tape_attr_group); | |
618 | cdev->dev.driver_data = tape_put_device(cdev->dev.driver_data); | |
619 | } | |
620 | } | |
621 | ||
622 | /* | |
623 | * Allocate a new tape ccw request | |
624 | */ | |
625 | struct tape_request * | |
626 | tape_alloc_request(int cplength, int datasize) | |
627 | { | |
628 | struct tape_request *request; | |
629 | ||
6aa0d3a9 | 630 | BUG_ON(datasize > PAGE_SIZE || (cplength*sizeof(struct ccw1)) > PAGE_SIZE); |
1da177e4 LT |
631 | |
632 | DBF_LH(6, "tape_alloc_request(%d, %d)\n", cplength, datasize); | |
633 | ||
88abaab4 | 634 | request = kzalloc(sizeof(struct tape_request), GFP_KERNEL); |
1da177e4 LT |
635 | if (request == NULL) { |
636 | DBF_EXCEPTION(1, "cqra nomem\n"); | |
637 | return ERR_PTR(-ENOMEM); | |
638 | } | |
1da177e4 LT |
639 | /* allocate channel program */ |
640 | if (cplength > 0) { | |
88abaab4 | 641 | request->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
642 | GFP_ATOMIC | GFP_DMA); |
643 | if (request->cpaddr == NULL) { | |
644 | DBF_EXCEPTION(1, "cqra nomem\n"); | |
645 | kfree(request); | |
646 | return ERR_PTR(-ENOMEM); | |
647 | } | |
1da177e4 LT |
648 | } |
649 | /* alloc small kernel buffer */ | |
650 | if (datasize > 0) { | |
88abaab4 | 651 | request->cpdata = kzalloc(datasize, GFP_KERNEL | GFP_DMA); |
1da177e4 LT |
652 | if (request->cpdata == NULL) { |
653 | DBF_EXCEPTION(1, "cqra nomem\n"); | |
17fd682e | 654 | kfree(request->cpaddr); |
1da177e4 LT |
655 | kfree(request); |
656 | return ERR_PTR(-ENOMEM); | |
657 | } | |
1da177e4 LT |
658 | } |
659 | DBF_LH(6, "New request %p(%p/%p)\n", request, request->cpaddr, | |
660 | request->cpdata); | |
661 | ||
662 | return request; | |
663 | } | |
664 | ||
665 | /* | |
666 | * Free tape ccw request | |
667 | */ | |
668 | void | |
669 | tape_free_request (struct tape_request * request) | |
670 | { | |
671 | DBF_LH(6, "Free request %p\n", request); | |
672 | ||
673 | if (request->device != NULL) { | |
674 | request->device = tape_put_device(request->device); | |
675 | } | |
17fd682e JJ |
676 | kfree(request->cpdata); |
677 | kfree(request->cpaddr); | |
1da177e4 LT |
678 | kfree(request); |
679 | } | |
680 | ||
4d284cac | 681 | static int |
4111796d SB |
682 | __tape_start_io(struct tape_device *device, struct tape_request *request) |
683 | { | |
684 | int rc; | |
685 | ||
686 | #ifdef CONFIG_S390_TAPE_BLOCK | |
687 | if (request->op == TO_BLOCK) | |
688 | device->discipline->check_locate(device, request); | |
689 | #endif | |
690 | rc = ccw_device_start( | |
691 | device->cdev, | |
692 | request->cpaddr, | |
693 | (unsigned long) request, | |
694 | 0x00, | |
695 | request->options | |
696 | ); | |
697 | if (rc == 0) { | |
698 | request->status = TAPE_REQUEST_IN_IO; | |
699 | } else if (rc == -EBUSY) { | |
700 | /* The common I/O subsystem is currently busy. Retry later. */ | |
701 | request->status = TAPE_REQUEST_QUEUED; | |
c1637532 | 702 | schedule_delayed_work(&device->tape_dnr, 0); |
4111796d SB |
703 | rc = 0; |
704 | } else { | |
705 | /* Start failed. Remove request and indicate failure. */ | |
706 | DBF_EVENT(1, "tape: start request failed with RC = %i\n", rc); | |
707 | } | |
708 | return rc; | |
709 | } | |
710 | ||
4d284cac | 711 | static void |
4111796d | 712 | __tape_start_next_request(struct tape_device *device) |
1da177e4 LT |
713 | { |
714 | struct list_head *l, *n; | |
715 | struct tape_request *request; | |
716 | int rc; | |
717 | ||
4111796d | 718 | DBF_LH(6, "__tape_start_next_request(%p)\n", device); |
1da177e4 LT |
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); | |
4111796d SB |
725 | |
726 | /* | |
727 | * Avoid race condition if bottom-half was triggered more than | |
728 | * once. | |
729 | */ | |
730 | if (request->status == TAPE_REQUEST_IN_IO) | |
731 | return; | |
5f384338 MH |
732 | /* |
733 | * Request has already been stopped. We have to wait until | |
734 | * the request is removed from the queue in the interrupt | |
735 | * handling. | |
736 | */ | |
737 | if (request->status == TAPE_REQUEST_DONE) | |
738 | return; | |
4111796d SB |
739 | |
740 | /* | |
741 | * We wanted to cancel the request but the common I/O layer | |
742 | * was busy at that time. This can only happen if this | |
743 | * function is called by delayed_next_request. | |
744 | * Otherwise we start the next request on the queue. | |
745 | */ | |
746 | if (request->status == TAPE_REQUEST_CANCEL) { | |
747 | rc = __tape_cancel_io(device, request); | |
748 | } else { | |
749 | rc = __tape_start_io(device, request); | |
1da177e4 | 750 | } |
4111796d SB |
751 | if (rc == 0) |
752 | return; | |
1da177e4 | 753 | |
4111796d | 754 | /* Set ending status. */ |
1da177e4 LT |
755 | request->rc = rc; |
756 | request->status = TAPE_REQUEST_DONE; | |
4111796d SB |
757 | |
758 | /* Remove from request queue. */ | |
759 | list_del(&request->list); | |
760 | ||
761 | /* Do callback. */ | |
762 | if (request->callback != NULL) | |
763 | request->callback(request, request->callback_data); | |
1da177e4 LT |
764 | } |
765 | } | |
766 | ||
767 | static void | |
c1637532 | 768 | tape_delayed_next_request(struct work_struct *work) |
1da177e4 | 769 | { |
c1637532 MS |
770 | struct tape_device *device = |
771 | container_of(work, struct tape_device, tape_dnr.work); | |
1da177e4 | 772 | |
4111796d SB |
773 | DBF_LH(6, "tape_delayed_next_request(%p)\n", device); |
774 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
775 | __tape_start_next_request(device); | |
776 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
777 | } | |
778 | ||
cced1dd4 MH |
779 | static void tape_long_busy_timeout(unsigned long data) |
780 | { | |
781 | struct tape_request *request; | |
782 | struct tape_device *device; | |
783 | ||
784 | device = (struct tape_device *) data; | |
785 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
786 | request = list_entry(device->req_queue.next, struct tape_request, list); | |
6aa0d3a9 | 787 | BUG_ON(request->status != TAPE_REQUEST_LONG_BUSY); |
cced1dd4 MH |
788 | DBF_LH(6, "%08x: Long busy timeout.\n", device->cdev_id); |
789 | __tape_start_next_request(device); | |
790 | device->lb_timeout.data = (unsigned long) tape_put_device(device); | |
791 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
792 | } | |
793 | ||
4d284cac | 794 | static void |
4111796d SB |
795 | __tape_end_request( |
796 | struct tape_device * device, | |
797 | struct tape_request * request, | |
798 | int rc) | |
799 | { | |
800 | DBF_LH(6, "__tape_end_request(%p, %p, %i)\n", device, request, rc); | |
801 | if (request) { | |
802 | request->rc = rc; | |
803 | request->status = TAPE_REQUEST_DONE; | |
804 | ||
805 | /* Remove from request queue. */ | |
806 | list_del(&request->list); | |
807 | ||
808 | /* Do callback. */ | |
809 | if (request->callback != NULL) | |
810 | request->callback(request, request->callback_data); | |
811 | } | |
1da177e4 LT |
812 | |
813 | /* Start next request. */ | |
814 | if (!list_empty(&device->req_queue)) | |
4111796d | 815 | __tape_start_next_request(device); |
1da177e4 LT |
816 | } |
817 | ||
1da177e4 LT |
818 | /* |
819 | * Write sense data to dbf | |
820 | */ | |
821 | void | |
822 | tape_dump_sense_dbf(struct tape_device *device, struct tape_request *request, | |
823 | struct irb *irb) | |
824 | { | |
825 | unsigned int *sptr; | |
826 | const char* op; | |
827 | ||
828 | if (request != NULL) | |
829 | op = tape_op_verbose[request->op]; | |
830 | else | |
831 | op = "---"; | |
832 | DBF_EVENT(3, "DSTAT : %02x CSTAT: %02x\n", | |
23d805b6 | 833 | irb->scsw.cmd.dstat, irb->scsw.cmd.cstat); |
1da177e4 LT |
834 | DBF_EVENT(3, "DEVICE: %08x OP\t: %s\n", device->cdev_id, op); |
835 | sptr = (unsigned int *) irb->ecw; | |
836 | DBF_EVENT(3, "%08x %08x\n", sptr[0], sptr[1]); | |
837 | DBF_EVENT(3, "%08x %08x\n", sptr[2], sptr[3]); | |
838 | DBF_EVENT(3, "%08x %08x\n", sptr[4], sptr[5]); | |
839 | DBF_EVENT(3, "%08x %08x\n", sptr[6], sptr[7]); | |
840 | } | |
841 | ||
842 | /* | |
843 | * I/O helper function. Adds the request to the request queue | |
844 | * and starts it if the tape is idle. Has to be called with | |
845 | * the device lock held. | |
846 | */ | |
4d284cac | 847 | static int |
4111796d | 848 | __tape_start_request(struct tape_device *device, struct tape_request *request) |
1da177e4 LT |
849 | { |
850 | int rc; | |
851 | ||
852 | switch (request->op) { | |
853 | case TO_MSEN: | |
854 | case TO_ASSIGN: | |
855 | case TO_UNASSIGN: | |
856 | case TO_READ_ATTMSG: | |
e2963062 | 857 | case TO_RDC: |
1da177e4 LT |
858 | if (device->tape_state == TS_INIT) |
859 | break; | |
860 | if (device->tape_state == TS_UNUSED) | |
861 | break; | |
862 | default: | |
863 | if (device->tape_state == TS_BLKUSE) | |
864 | break; | |
865 | if (device->tape_state != TS_IN_USE) | |
866 | return -ENODEV; | |
867 | } | |
868 | ||
869 | /* Increase use count of device for the added request. */ | |
870 | request->device = tape_get_device_reference(device); | |
871 | ||
872 | if (list_empty(&device->req_queue)) { | |
873 | /* No other requests are on the queue. Start this one. */ | |
4111796d SB |
874 | rc = __tape_start_io(device, request); |
875 | if (rc) | |
1da177e4 | 876 | return rc; |
4111796d | 877 | |
1da177e4 LT |
878 | DBF_LH(5, "Request %p added for execution.\n", request); |
879 | list_add(&request->list, &device->req_queue); | |
1da177e4 LT |
880 | } else { |
881 | DBF_LH(5, "Request %p add to queue.\n", request); | |
1da177e4 | 882 | request->status = TAPE_REQUEST_QUEUED; |
4111796d | 883 | list_add_tail(&request->list, &device->req_queue); |
1da177e4 LT |
884 | } |
885 | return 0; | |
886 | } | |
887 | ||
888 | /* | |
889 | * Add the request to the request queue, try to start it if the | |
890 | * tape is idle. Return without waiting for end of i/o. | |
891 | */ | |
892 | int | |
893 | tape_do_io_async(struct tape_device *device, struct tape_request *request) | |
894 | { | |
895 | int rc; | |
896 | ||
897 | DBF_LH(6, "tape_do_io_async(%p, %p)\n", device, request); | |
898 | ||
899 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
900 | /* Add request to request queue and try to start it. */ | |
4111796d | 901 | rc = __tape_start_request(device, request); |
1da177e4 LT |
902 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
903 | return rc; | |
904 | } | |
905 | ||
906 | /* | |
907 | * tape_do_io/__tape_wake_up | |
908 | * Add the request to the request queue, try to start it if the | |
909 | * tape is idle and wait uninterruptible for its completion. | |
910 | */ | |
911 | static void | |
912 | __tape_wake_up(struct tape_request *request, void *data) | |
913 | { | |
914 | request->callback = NULL; | |
915 | wake_up((wait_queue_head_t *) data); | |
916 | } | |
917 | ||
918 | int | |
919 | tape_do_io(struct tape_device *device, struct tape_request *request) | |
920 | { | |
1da177e4 LT |
921 | int rc; |
922 | ||
1da177e4 LT |
923 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
924 | /* Setup callback */ | |
925 | request->callback = __tape_wake_up; | |
4657fb8a | 926 | request->callback_data = &device->wait_queue; |
1da177e4 | 927 | /* Add request to request queue and try to start it. */ |
4111796d | 928 | rc = __tape_start_request(device, request); |
1da177e4 LT |
929 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
930 | if (rc) | |
931 | return rc; | |
932 | /* Request added to the queue. Wait for its completion. */ | |
4657fb8a | 933 | wait_event(device->wait_queue, (request->callback == NULL)); |
1da177e4 LT |
934 | /* Get rc from request */ |
935 | return request->rc; | |
936 | } | |
937 | ||
938 | /* | |
939 | * tape_do_io_interruptible/__tape_wake_up_interruptible | |
940 | * Add the request to the request queue, try to start it if the | |
941 | * tape is idle and wait uninterruptible for its completion. | |
942 | */ | |
943 | static void | |
944 | __tape_wake_up_interruptible(struct tape_request *request, void *data) | |
945 | { | |
946 | request->callback = NULL; | |
947 | wake_up_interruptible((wait_queue_head_t *) data); | |
948 | } | |
949 | ||
950 | int | |
951 | tape_do_io_interruptible(struct tape_device *device, | |
952 | struct tape_request *request) | |
953 | { | |
1da177e4 LT |
954 | int rc; |
955 | ||
1da177e4 LT |
956 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
957 | /* Setup callback */ | |
958 | request->callback = __tape_wake_up_interruptible; | |
4657fb8a | 959 | request->callback_data = &device->wait_queue; |
4111796d | 960 | rc = __tape_start_request(device, request); |
1da177e4 LT |
961 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
962 | if (rc) | |
963 | return rc; | |
964 | /* Request added to the queue. Wait for its completion. */ | |
4657fb8a MS |
965 | rc = wait_event_interruptible(device->wait_queue, |
966 | (request->callback == NULL)); | |
1da177e4 LT |
967 | if (rc != -ERESTARTSYS) |
968 | /* Request finished normally. */ | |
969 | return request->rc; | |
4111796d | 970 | |
1da177e4 LT |
971 | /* Interrupted by a signal. We have to stop the current request. */ |
972 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
4111796d SB |
973 | rc = __tape_cancel_io(device, request); |
974 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 | 975 | if (rc == 0) { |
4111796d SB |
976 | /* Wait for the interrupt that acknowledges the halt. */ |
977 | do { | |
978 | rc = wait_event_interruptible( | |
4657fb8a | 979 | device->wait_queue, |
4111796d SB |
980 | (request->callback == NULL) |
981 | ); | |
4cd190a7 | 982 | } while (rc == -ERESTARTSYS); |
4111796d | 983 | |
1da177e4 LT |
984 | DBF_EVENT(3, "IO stopped on %08x\n", device->cdev_id); |
985 | rc = -ERESTARTSYS; | |
986 | } | |
1da177e4 LT |
987 | return rc; |
988 | } | |
989 | ||
5f384338 MH |
990 | /* |
991 | * Stop running ccw. | |
992 | */ | |
993 | int | |
994 | tape_cancel_io(struct tape_device *device, struct tape_request *request) | |
995 | { | |
996 | int rc; | |
997 | ||
998 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
999 | rc = __tape_cancel_io(device, request); | |
1000 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1001 | return rc; | |
1002 | } | |
1003 | ||
1da177e4 LT |
1004 | /* |
1005 | * Tape interrupt routine, called from the ccw_device layer | |
1006 | */ | |
1007 | static void | |
1008 | __tape_do_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb) | |
1009 | { | |
1010 | struct tape_device *device; | |
1011 | struct tape_request *request; | |
1da177e4 LT |
1012 | int rc; |
1013 | ||
1014 | device = (struct tape_device *) cdev->dev.driver_data; | |
1015 | if (device == NULL) { | |
1da177e4 LT |
1016 | return; |
1017 | } | |
1018 | request = (struct tape_request *) intparm; | |
1019 | ||
1020 | DBF_LH(6, "__tape_do_irq(device=%p, request=%p)\n", device, request); | |
1021 | ||
1022 | /* On special conditions irb is an error pointer */ | |
1023 | if (IS_ERR(irb)) { | |
4111796d | 1024 | /* FIXME: What to do with the request? */ |
1da177e4 LT |
1025 | switch (PTR_ERR(irb)) { |
1026 | case -ETIMEDOUT: | |
ab640db0 | 1027 | DBF_LH(1, "(%s): Request timed out\n", |
2a0217d5 | 1028 | dev_name(&cdev->dev)); |
1da177e4 | 1029 | case -EIO: |
4111796d | 1030 | __tape_end_request(device, request, -EIO); |
1da177e4 LT |
1031 | break; |
1032 | default: | |
ab640db0 | 1033 | DBF_LH(1, "(%s): Unexpected i/o error %li\n", |
2a0217d5 | 1034 | dev_name(&cdev->dev), |
1da177e4 LT |
1035 | PTR_ERR(irb)); |
1036 | } | |
1037 | return; | |
1038 | } | |
1039 | ||
4111796d SB |
1040 | /* |
1041 | * If the condition code is not zero and the start function bit is | |
1042 | * still set, this is an deferred error and the last start I/O did | |
842d3fba SB |
1043 | * not succeed. At this point the condition that caused the deferred |
1044 | * error might still apply. So we just schedule the request to be | |
1045 | * started later. | |
4111796d | 1046 | */ |
23d805b6 PO |
1047 | if (irb->scsw.cmd.cc != 0 && |
1048 | (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) && | |
5f384338 MH |
1049 | (request->status == TAPE_REQUEST_IN_IO)) { |
1050 | DBF_EVENT(3,"(%08x): deferred cc=%i, fctl=%i. restarting\n", | |
23d805b6 | 1051 | device->cdev_id, irb->scsw.cmd.cc, irb->scsw.cmd.fctl); |
842d3fba | 1052 | request->status = TAPE_REQUEST_QUEUED; |
5f384338 | 1053 | schedule_delayed_work(&device->tape_dnr, HZ); |
4111796d SB |
1054 | return; |
1055 | } | |
1056 | ||
1da177e4 LT |
1057 | /* May be an unsolicited irq */ |
1058 | if(request != NULL) | |
23d805b6 PO |
1059 | request->rescnt = irb->scsw.cmd.count; |
1060 | else if ((irb->scsw.cmd.dstat == 0x85 || irb->scsw.cmd.dstat == 0x80) && | |
cced1dd4 MH |
1061 | !list_empty(&device->req_queue)) { |
1062 | /* Not Ready to Ready after long busy ? */ | |
1063 | struct tape_request *req; | |
1064 | req = list_entry(device->req_queue.next, | |
1065 | struct tape_request, list); | |
1066 | if (req->status == TAPE_REQUEST_LONG_BUSY) { | |
1067 | DBF_EVENT(3, "(%08x): del timer\n", device->cdev_id); | |
1068 | if (del_timer(&device->lb_timeout)) { | |
1069 | device->lb_timeout.data = (unsigned long) | |
1070 | tape_put_device(device); | |
1071 | __tape_start_next_request(device); | |
1072 | } | |
1073 | return; | |
1074 | } | |
1075 | } | |
23d805b6 | 1076 | if (irb->scsw.cmd.dstat != 0x0c) { |
1da177e4 LT |
1077 | /* Set the 'ONLINE' flag depending on sense byte 1 */ |
1078 | if(*(((__u8 *) irb->ecw) + 1) & SENSE_DRIVE_ONLINE) | |
1079 | device->tape_generic_status |= GMT_ONLINE(~0); | |
1080 | else | |
1081 | device->tape_generic_status &= ~GMT_ONLINE(~0); | |
1082 | ||
1083 | /* | |
1084 | * Any request that does not come back with channel end | |
1085 | * and device end is unusual. Log the sense data. | |
1086 | */ | |
1087 | DBF_EVENT(3,"-- Tape Interrupthandler --\n"); | |
1088 | tape_dump_sense_dbf(device, request, irb); | |
1089 | } else { | |
1090 | /* Upon normal completion the device _is_ online */ | |
1091 | device->tape_generic_status |= GMT_ONLINE(~0); | |
1092 | } | |
1093 | if (device->tape_state == TS_NOT_OPER) { | |
1094 | DBF_EVENT(6, "tape:device is not operational\n"); | |
1095 | return; | |
1096 | } | |
1097 | ||
1098 | /* | |
1099 | * Request that were canceled still come back with an interrupt. | |
1100 | * To detect these request the state will be set to TAPE_REQUEST_DONE. | |
1101 | */ | |
1102 | if(request != NULL && request->status == TAPE_REQUEST_DONE) { | |
4111796d | 1103 | __tape_end_request(device, request, -EIO); |
1da177e4 LT |
1104 | return; |
1105 | } | |
1106 | ||
1107 | rc = device->discipline->irq(device, request, irb); | |
1108 | /* | |
1109 | * rc < 0 : request finished unsuccessfully. | |
1110 | * rc == TAPE_IO_SUCCESS: request finished successfully. | |
1111 | * rc == TAPE_IO_PENDING: request is still running. Ignore rc. | |
1112 | * rc == TAPE_IO_RETRY: request finished but needs another go. | |
1113 | * rc == TAPE_IO_STOP: request needs to get terminated. | |
1114 | */ | |
1da177e4 | 1115 | switch (rc) { |
4111796d SB |
1116 | case TAPE_IO_SUCCESS: |
1117 | /* Upon normal completion the device _is_ online */ | |
1118 | device->tape_generic_status |= GMT_ONLINE(~0); | |
1119 | __tape_end_request(device, request, rc); | |
1120 | break; | |
1121 | case TAPE_IO_PENDING: | |
1122 | break; | |
cced1dd4 MH |
1123 | case TAPE_IO_LONG_BUSY: |
1124 | device->lb_timeout.data = | |
1125 | (unsigned long)tape_get_device_reference(device); | |
1126 | device->lb_timeout.expires = jiffies + | |
1127 | LONG_BUSY_TIMEOUT * HZ; | |
1128 | DBF_EVENT(3, "(%08x): add timer\n", device->cdev_id); | |
1129 | add_timer(&device->lb_timeout); | |
1130 | request->status = TAPE_REQUEST_LONG_BUSY; | |
1131 | break; | |
4111796d SB |
1132 | case TAPE_IO_RETRY: |
1133 | rc = __tape_start_io(device, request); | |
1134 | if (rc) | |
1135 | __tape_end_request(device, request, rc); | |
1136 | break; | |
1137 | case TAPE_IO_STOP: | |
1138 | rc = __tape_cancel_io(device, request); | |
1139 | if (rc) | |
1140 | __tape_end_request(device, request, rc); | |
1141 | break; | |
1142 | default: | |
1143 | if (rc > 0) { | |
1144 | DBF_EVENT(6, "xunknownrc\n"); | |
4111796d SB |
1145 | __tape_end_request(device, request, -EIO); |
1146 | } else { | |
1147 | __tape_end_request(device, request, rc); | |
1148 | } | |
1149 | break; | |
1da177e4 LT |
1150 | } |
1151 | } | |
1152 | ||
1153 | /* | |
1154 | * Tape device open function used by tape_char & tape_block frontends. | |
1155 | */ | |
1156 | int | |
1157 | tape_open(struct tape_device *device) | |
1158 | { | |
1159 | int rc; | |
1160 | ||
b3c21e49 | 1161 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1da177e4 LT |
1162 | if (device->tape_state == TS_NOT_OPER) { |
1163 | DBF_EVENT(6, "TAPE:nodev\n"); | |
1164 | rc = -ENODEV; | |
1165 | } else if (device->tape_state == TS_IN_USE) { | |
1166 | DBF_EVENT(6, "TAPE:dbusy\n"); | |
1167 | rc = -EBUSY; | |
1168 | } else if (device->tape_state == TS_BLKUSE) { | |
1169 | DBF_EVENT(6, "TAPE:dbusy\n"); | |
1170 | rc = -EBUSY; | |
1171 | } else if (device->discipline != NULL && | |
1172 | !try_module_get(device->discipline->owner)) { | |
1173 | DBF_EVENT(6, "TAPE:nodisc\n"); | |
1174 | rc = -ENODEV; | |
1175 | } else { | |
1176 | tape_state_set(device, TS_IN_USE); | |
1177 | rc = 0; | |
1178 | } | |
b3c21e49 | 1179 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1da177e4 LT |
1180 | return rc; |
1181 | } | |
1182 | ||
1183 | /* | |
1184 | * Tape device release function used by tape_char & tape_block frontends. | |
1185 | */ | |
1186 | int | |
1187 | tape_release(struct tape_device *device) | |
1188 | { | |
b3c21e49 | 1189 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1da177e4 LT |
1190 | if (device->tape_state == TS_IN_USE) |
1191 | tape_state_set(device, TS_UNUSED); | |
1192 | module_put(device->discipline->owner); | |
b3c21e49 | 1193 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1da177e4 LT |
1194 | return 0; |
1195 | } | |
1196 | ||
1197 | /* | |
1198 | * Execute a magnetic tape command a number of times. | |
1199 | */ | |
1200 | int | |
1201 | tape_mtop(struct tape_device *device, int mt_op, int mt_count) | |
1202 | { | |
1203 | tape_mtop_fn fn; | |
1204 | int rc; | |
1205 | ||
1206 | DBF_EVENT(6, "TAPE:mtio\n"); | |
1207 | DBF_EVENT(6, "TAPE:ioop: %x\n", mt_op); | |
1208 | DBF_EVENT(6, "TAPE:arg: %x\n", mt_count); | |
1209 | ||
1210 | if (mt_op < 0 || mt_op >= TAPE_NR_MTOPS) | |
1211 | return -EINVAL; | |
1212 | fn = device->discipline->mtop_array[mt_op]; | |
1213 | if (fn == NULL) | |
1214 | return -EINVAL; | |
1215 | ||
1216 | /* We assume that the backends can handle count up to 500. */ | |
1217 | if (mt_op == MTBSR || mt_op == MTFSR || mt_op == MTFSF || | |
1218 | mt_op == MTBSF || mt_op == MTFSFM || mt_op == MTBSFM) { | |
1219 | rc = 0; | |
1220 | for (; mt_count > 500; mt_count -= 500) | |
1221 | if ((rc = fn(device, 500)) != 0) | |
1222 | break; | |
1223 | if (rc == 0) | |
1224 | rc = fn(device, mt_count); | |
1225 | } else | |
1226 | rc = fn(device, mt_count); | |
1227 | return rc; | |
1228 | ||
1229 | } | |
1230 | ||
1231 | /* | |
1232 | * Tape init function. | |
1233 | */ | |
1234 | static int | |
1235 | tape_init (void) | |
1236 | { | |
66a464db | 1237 | TAPE_DBF_AREA = debug_register ( "tape", 2, 2, 4*sizeof(long)); |
1da177e4 LT |
1238 | debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view); |
1239 | #ifdef DBF_LIKE_HELL | |
1240 | debug_set_level(TAPE_DBF_AREA, 6); | |
1241 | #endif | |
e018ba1f | 1242 | DBF_EVENT(3, "tape init\n"); |
1da177e4 LT |
1243 | tape_proc_init(); |
1244 | tapechar_init (); | |
1245 | tapeblock_init (); | |
1246 | return 0; | |
1247 | } | |
1248 | ||
1249 | /* | |
1250 | * Tape exit function. | |
1251 | */ | |
1252 | static void | |
1253 | tape_exit(void) | |
1254 | { | |
1255 | DBF_EVENT(6, "tape exit\n"); | |
1256 | ||
1257 | /* Get rid of the frontends */ | |
1258 | tapechar_exit(); | |
1259 | tapeblock_exit(); | |
1260 | tape_proc_cleanup(); | |
1261 | debug_unregister (TAPE_DBF_AREA); | |
1262 | } | |
1263 | ||
1264 | MODULE_AUTHOR("(C) 2001 IBM Deutschland Entwicklung GmbH by Carsten Otte and " | |
1265 | "Michael Holzheu (cotte@de.ibm.com,holzheu@de.ibm.com)"); | |
e018ba1f | 1266 | MODULE_DESCRIPTION("Linux on zSeries channel attached tape device driver"); |
1da177e4 LT |
1267 | MODULE_LICENSE("GPL"); |
1268 | ||
1269 | module_init(tape_init); | |
1270 | module_exit(tape_exit); | |
1271 | ||
1272 | EXPORT_SYMBOL(tape_generic_remove); | |
1273 | EXPORT_SYMBOL(tape_generic_probe); | |
1274 | EXPORT_SYMBOL(tape_generic_online); | |
1275 | EXPORT_SYMBOL(tape_generic_offline); | |
1276 | EXPORT_SYMBOL(tape_put_device); | |
1277 | EXPORT_SYMBOL(tape_get_device_reference); | |
1278 | EXPORT_SYMBOL(tape_state_verbose); | |
1279 | EXPORT_SYMBOL(tape_op_verbose); | |
1280 | EXPORT_SYMBOL(tape_state_set); | |
1281 | EXPORT_SYMBOL(tape_med_state_set); | |
1282 | EXPORT_SYMBOL(tape_alloc_request); | |
1283 | EXPORT_SYMBOL(tape_free_request); | |
1da177e4 LT |
1284 | EXPORT_SYMBOL(tape_dump_sense_dbf); |
1285 | EXPORT_SYMBOL(tape_do_io); | |
1286 | EXPORT_SYMBOL(tape_do_io_async); | |
1287 | EXPORT_SYMBOL(tape_do_io_interruptible); | |
5f384338 | 1288 | EXPORT_SYMBOL(tape_cancel_io); |
1da177e4 | 1289 | EXPORT_SYMBOL(tape_mtop); |