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 | |
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 | ||
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: " | |
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 | */ | |
40 | static struct list_head tape_device_list = LIST_HEAD_INIT(tape_device_list); | |
41 | static DEFINE_RWLOCK(tape_device_lock); | |
42 | ||
43 | /* | |
44 | * Pointer to debug area. | |
45 | */ | |
46 | debug_info_t *TAPE_DBF_AREA = NULL; | |
47 | EXPORT_SYMBOL(TAPE_DBF_AREA); | |
48 | ||
49 | /* | |
50 | * Printable strings for tape enumerations. | |
51 | */ | |
52 | const char *tape_state_verbose[TS_SIZE] = | |
53 | { | |
54 | [TS_UNUSED] = "UNUSED", | |
55 | [TS_IN_USE] = "IN_USE", | |
56 | [TS_BLKUSE] = "BLKUSE", | |
57 | [TS_INIT] = "INIT ", | |
58 | [TS_NOT_OPER] = "NOT_OP" | |
59 | }; | |
60 | ||
61 | const char *tape_op_verbose[TO_SIZE] = | |
62 | { | |
63 | [TO_BLOCK] = "BLK", [TO_BSB] = "BSB", | |
64 | [TO_BSF] = "BSF", [TO_DSE] = "DSE", | |
65 | [TO_FSB] = "FSB", [TO_FSF] = "FSF", | |
66 | [TO_LBL] = "LBL", [TO_NOP] = "NOP", | |
67 | [TO_RBA] = "RBA", [TO_RBI] = "RBI", | |
68 | [TO_RFO] = "RFO", [TO_REW] = "REW", | |
69 | [TO_RUN] = "RUN", [TO_WRI] = "WRI", | |
70 | [TO_WTM] = "WTM", [TO_MSEN] = "MSN", | |
71 | [TO_LOAD] = "LOA", [TO_READ_CONFIG] = "RCF", | |
72 | [TO_READ_ATTMSG] = "RAT", | |
73 | [TO_DIS] = "DIS", [TO_ASSIGN] = "ASS", | |
cced1dd4 MH |
74 | [TO_UNASSIGN] = "UAS", [TO_CRYPT_ON] = "CON", |
75 | [TO_CRYPT_OFF] = "COF", [TO_KEKL_SET] = "KLS", | |
76 | [TO_KEKL_QUERY] = "KLQ", | |
1da177e4 LT |
77 | }; |
78 | ||
4d284cac | 79 | static int |
1da177e4 LT |
80 | busid_to_int(char *bus_id) |
81 | { | |
82 | int dec; | |
83 | int d; | |
84 | char * s; | |
85 | ||
86 | for(s = bus_id, d = 0; *s != '\0' && *s != '.'; s++) | |
87 | d = (d * 10) + (*s - '0'); | |
88 | dec = d; | |
89 | for(s++, d = 0; *s != '\0' && *s != '.'; s++) | |
90 | d = (d * 10) + (*s - '0'); | |
91 | dec = (dec << 8) + d; | |
92 | ||
93 | for(s++; *s != '\0'; s++) { | |
94 | if (*s >= '0' && *s <= '9') { | |
95 | d = *s - '0'; | |
96 | } else if (*s >= 'a' && *s <= 'f') { | |
97 | d = *s - 'a' + 10; | |
98 | } else { | |
99 | d = *s - 'A' + 10; | |
100 | } | |
101 | dec = (dec << 4) + d; | |
102 | } | |
103 | ||
104 | return dec; | |
105 | } | |
106 | ||
107 | /* | |
108 | * Some channel attached tape specific attributes. | |
109 | * | |
110 | * FIXME: In the future the first_minor and blocksize attribute should be | |
111 | * replaced by a link to the cdev tree. | |
112 | */ | |
113 | static ssize_t | |
3fd3c0a5 | 114 | tape_medium_state_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
115 | { |
116 | struct tape_device *tdev; | |
117 | ||
118 | tdev = (struct tape_device *) dev->driver_data; | |
119 | return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->medium_state); | |
120 | } | |
121 | ||
122 | static | |
123 | DEVICE_ATTR(medium_state, 0444, tape_medium_state_show, NULL); | |
124 | ||
125 | static ssize_t | |
3fd3c0a5 | 126 | tape_first_minor_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
127 | { |
128 | struct tape_device *tdev; | |
129 | ||
130 | tdev = (struct tape_device *) dev->driver_data; | |
131 | return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->first_minor); | |
132 | } | |
133 | ||
134 | static | |
135 | DEVICE_ATTR(first_minor, 0444, tape_first_minor_show, NULL); | |
136 | ||
137 | static ssize_t | |
3fd3c0a5 | 138 | tape_state_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
139 | { |
140 | struct tape_device *tdev; | |
141 | ||
142 | tdev = (struct tape_device *) dev->driver_data; | |
143 | return scnprintf(buf, PAGE_SIZE, "%s\n", (tdev->first_minor < 0) ? | |
144 | "OFFLINE" : tape_state_verbose[tdev->tape_state]); | |
145 | } | |
146 | ||
147 | static | |
148 | DEVICE_ATTR(state, 0444, tape_state_show, NULL); | |
149 | ||
150 | static ssize_t | |
3fd3c0a5 | 151 | tape_operation_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
152 | { |
153 | struct tape_device *tdev; | |
154 | ssize_t rc; | |
155 | ||
156 | tdev = (struct tape_device *) dev->driver_data; | |
157 | if (tdev->first_minor < 0) | |
158 | return scnprintf(buf, PAGE_SIZE, "N/A\n"); | |
159 | ||
160 | spin_lock_irq(get_ccwdev_lock(tdev->cdev)); | |
161 | if (list_empty(&tdev->req_queue)) | |
162 | rc = scnprintf(buf, PAGE_SIZE, "---\n"); | |
163 | else { | |
164 | struct tape_request *req; | |
165 | ||
166 | req = list_entry(tdev->req_queue.next, struct tape_request, | |
167 | list); | |
168 | rc = scnprintf(buf,PAGE_SIZE, "%s\n", tape_op_verbose[req->op]); | |
169 | } | |
170 | spin_unlock_irq(get_ccwdev_lock(tdev->cdev)); | |
171 | return rc; | |
172 | } | |
173 | ||
174 | static | |
175 | DEVICE_ATTR(operation, 0444, tape_operation_show, NULL); | |
176 | ||
177 | static ssize_t | |
3fd3c0a5 | 178 | tape_blocksize_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
179 | { |
180 | struct tape_device *tdev; | |
181 | ||
182 | tdev = (struct tape_device *) dev->driver_data; | |
183 | ||
184 | return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->char_data.block_size); | |
185 | } | |
186 | ||
187 | static | |
188 | DEVICE_ATTR(blocksize, 0444, tape_blocksize_show, NULL); | |
189 | ||
190 | static struct attribute *tape_attrs[] = { | |
191 | &dev_attr_medium_state.attr, | |
192 | &dev_attr_first_minor.attr, | |
193 | &dev_attr_state.attr, | |
194 | &dev_attr_operation.attr, | |
195 | &dev_attr_blocksize.attr, | |
196 | NULL | |
197 | }; | |
198 | ||
199 | static struct attribute_group tape_attr_group = { | |
200 | .attrs = tape_attrs, | |
201 | }; | |
202 | ||
203 | /* | |
204 | * Tape state functions | |
205 | */ | |
206 | void | |
207 | tape_state_set(struct tape_device *device, enum tape_state newstate) | |
208 | { | |
209 | const char *str; | |
210 | ||
211 | if (device->tape_state == TS_NOT_OPER) { | |
212 | DBF_EVENT(3, "ts_set err: not oper\n"); | |
213 | return; | |
214 | } | |
215 | DBF_EVENT(4, "ts. dev: %x\n", device->first_minor); | |
f976069a PO |
216 | DBF_EVENT(4, "old ts:\t\n"); |
217 | if (device->tape_state < TS_SIZE && device->tape_state >=0 ) | |
1da177e4 LT |
218 | str = tape_state_verbose[device->tape_state]; |
219 | else | |
220 | str = "UNKNOWN TS"; | |
221 | DBF_EVENT(4, "%s\n", str); | |
222 | DBF_EVENT(4, "new ts:\t\n"); | |
f976069a | 223 | if (newstate < TS_SIZE && newstate >= 0) |
1da177e4 LT |
224 | str = tape_state_verbose[newstate]; |
225 | else | |
226 | str = "UNKNOWN TS"; | |
227 | DBF_EVENT(4, "%s\n", str); | |
228 | device->tape_state = newstate; | |
229 | wake_up(&device->state_change_wq); | |
230 | } | |
231 | ||
232 | void | |
233 | tape_med_state_set(struct tape_device *device, enum tape_medium_state newstate) | |
234 | { | |
235 | if (device->medium_state == newstate) | |
236 | return; | |
237 | switch(newstate){ | |
238 | case MS_UNLOADED: | |
239 | device->tape_generic_status |= GMT_DR_OPEN(~0); | |
240 | PRINT_INFO("(%s): Tape is unloaded\n", | |
241 | device->cdev->dev.bus_id); | |
242 | break; | |
243 | case MS_LOADED: | |
244 | device->tape_generic_status &= ~GMT_DR_OPEN(~0); | |
245 | PRINT_INFO("(%s): Tape has been mounted\n", | |
246 | device->cdev->dev.bus_id); | |
247 | break; | |
248 | default: | |
249 | // print nothing | |
250 | break; | |
251 | } | |
252 | device->medium_state = newstate; | |
253 | wake_up(&device->state_change_wq); | |
254 | } | |
255 | ||
256 | /* | |
257 | * Stop running ccw. Has to be called with the device lock held. | |
258 | */ | |
4d284cac | 259 | static int |
4111796d | 260 | __tape_cancel_io(struct tape_device *device, struct tape_request *request) |
1da177e4 LT |
261 | { |
262 | int retries; | |
263 | int rc; | |
264 | ||
265 | /* Check if interrupt has already been processed */ | |
266 | if (request->callback == NULL) | |
267 | return 0; | |
268 | ||
269 | rc = 0; | |
270 | for (retries = 0; retries < 5; retries++) { | |
271 | rc = ccw_device_clear(device->cdev, (long) request); | |
272 | ||
4111796d SB |
273 | switch (rc) { |
274 | case 0: | |
275 | request->status = TAPE_REQUEST_DONE; | |
276 | return 0; | |
277 | case -EBUSY: | |
278 | request->status = TAPE_REQUEST_CANCEL; | |
c1637532 | 279 | schedule_delayed_work(&device->tape_dnr, 0); |
4111796d SB |
280 | return 0; |
281 | case -ENODEV: | |
282 | DBF_EXCEPTION(2, "device gone, retry\n"); | |
283 | break; | |
284 | case -EIO: | |
285 | DBF_EXCEPTION(2, "I/O error, retry\n"); | |
286 | break; | |
287 | default: | |
288 | BUG(); | |
1da177e4 | 289 | } |
1da177e4 LT |
290 | } |
291 | ||
292 | return rc; | |
293 | } | |
294 | ||
295 | /* | |
296 | * Add device into the sorted list, giving it the first | |
297 | * available minor number. | |
298 | */ | |
299 | static int | |
300 | tape_assign_minor(struct tape_device *device) | |
301 | { | |
302 | struct tape_device *tmp; | |
303 | int minor; | |
304 | ||
305 | minor = 0; | |
306 | write_lock(&tape_device_lock); | |
307 | list_for_each_entry(tmp, &tape_device_list, node) { | |
308 | if (minor < tmp->first_minor) | |
309 | break; | |
310 | minor += TAPE_MINORS_PER_DEV; | |
311 | } | |
312 | if (minor >= 256) { | |
313 | write_unlock(&tape_device_lock); | |
314 | return -ENODEV; | |
315 | } | |
316 | device->first_minor = minor; | |
317 | list_add_tail(&device->node, &tmp->node); | |
318 | write_unlock(&tape_device_lock); | |
319 | return 0; | |
320 | } | |
321 | ||
322 | /* remove device from the list */ | |
323 | static void | |
324 | tape_remove_minor(struct tape_device *device) | |
325 | { | |
326 | write_lock(&tape_device_lock); | |
327 | list_del_init(&device->node); | |
328 | device->first_minor = -1; | |
329 | write_unlock(&tape_device_lock); | |
330 | } | |
331 | ||
332 | /* | |
333 | * Set a device online. | |
334 | * | |
335 | * This function is called by the common I/O layer to move a device from the | |
336 | * detected but offline into the online state. | |
337 | * If we return an error (RC < 0) the device remains in the offline state. This | |
338 | * can happen if the device is assigned somewhere else, for example. | |
339 | */ | |
340 | int | |
341 | tape_generic_online(struct tape_device *device, | |
342 | struct tape_discipline *discipline) | |
343 | { | |
344 | int rc; | |
345 | ||
346 | DBF_LH(6, "tape_enable_device(%p, %p)\n", device, discipline); | |
347 | ||
348 | if (device->tape_state != TS_INIT) { | |
349 | DBF_LH(3, "Tapestate not INIT (%d)\n", device->tape_state); | |
350 | return -EINVAL; | |
351 | } | |
352 | ||
cced1dd4 MH |
353 | init_timer(&device->lb_timeout); |
354 | device->lb_timeout.function = tape_long_busy_timeout; | |
355 | ||
1da177e4 LT |
356 | /* Let the discipline have a go at the device. */ |
357 | device->discipline = discipline; | |
358 | if (!try_module_get(discipline->owner)) { | |
359 | PRINT_ERR("Cannot get module. Module gone.\n"); | |
360 | return -EINVAL; | |
361 | } | |
362 | ||
363 | rc = discipline->setup_device(device); | |
364 | if (rc) | |
365 | goto out; | |
366 | rc = tape_assign_minor(device); | |
367 | if (rc) | |
368 | goto out_discipline; | |
369 | ||
370 | rc = tapechar_setup_device(device); | |
371 | if (rc) | |
372 | goto out_minor; | |
373 | rc = tapeblock_setup_device(device); | |
374 | if (rc) | |
375 | goto out_char; | |
376 | ||
377 | tape_state_set(device, TS_UNUSED); | |
378 | ||
379 | DBF_LH(3, "(%08x): Drive set online\n", device->cdev_id); | |
380 | ||
381 | return 0; | |
382 | ||
383 | out_char: | |
384 | tapechar_cleanup_device(device); | |
385 | out_discipline: | |
386 | device->discipline->cleanup_device(device); | |
387 | device->discipline = NULL; | |
388 | out_minor: | |
389 | tape_remove_minor(device); | |
390 | out: | |
391 | module_put(discipline->owner); | |
392 | return rc; | |
393 | } | |
394 | ||
4d284cac | 395 | static void |
1da177e4 LT |
396 | tape_cleanup_device(struct tape_device *device) |
397 | { | |
398 | tapeblock_cleanup_device(device); | |
399 | tapechar_cleanup_device(device); | |
400 | device->discipline->cleanup_device(device); | |
401 | module_put(device->discipline->owner); | |
402 | tape_remove_minor(device); | |
403 | tape_med_state_set(device, MS_UNKNOWN); | |
404 | } | |
405 | ||
406 | /* | |
407 | * Set device offline. | |
408 | * | |
409 | * Called by the common I/O layer if the drive should set offline on user | |
410 | * request. We may prevent this by returning an error. | |
411 | * Manual offline is only allowed while the drive is not in use. | |
412 | */ | |
413 | int | |
414 | tape_generic_offline(struct tape_device *device) | |
415 | { | |
416 | if (!device) { | |
417 | PRINT_ERR("tape_generic_offline: no such device\n"); | |
418 | return -ENODEV; | |
419 | } | |
420 | ||
421 | DBF_LH(3, "(%08x): tape_generic_offline(%p)\n", | |
422 | device->cdev_id, device); | |
423 | ||
424 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
425 | switch (device->tape_state) { | |
426 | case TS_INIT: | |
427 | case TS_NOT_OPER: | |
428 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
429 | break; | |
430 | case TS_UNUSED: | |
431 | tape_state_set(device, TS_INIT); | |
432 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
433 | tape_cleanup_device(device); | |
434 | break; | |
435 | default: | |
436 | DBF_EVENT(3, "(%08x): Set offline failed " | |
437 | "- drive in use.\n", | |
438 | device->cdev_id); | |
439 | PRINT_WARN("(%s): Set offline failed " | |
440 | "- drive in use.\n", | |
441 | device->cdev->dev.bus_id); | |
442 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
443 | return -EBUSY; | |
444 | } | |
445 | ||
446 | DBF_LH(3, "(%08x): Drive set offline.\n", device->cdev_id); | |
447 | return 0; | |
448 | } | |
449 | ||
450 | /* | |
451 | * Allocate memory for a new device structure. | |
452 | */ | |
453 | static struct tape_device * | |
454 | tape_alloc_device(void) | |
455 | { | |
456 | struct tape_device *device; | |
457 | ||
88abaab4 | 458 | device = kzalloc(sizeof(struct tape_device), GFP_KERNEL); |
1da177e4 LT |
459 | if (device == NULL) { |
460 | DBF_EXCEPTION(2, "ti:no mem\n"); | |
461 | PRINT_INFO ("can't allocate memory for " | |
462 | "tape info structure\n"); | |
463 | return ERR_PTR(-ENOMEM); | |
464 | } | |
88abaab4 | 465 | device->modeset_byte = kmalloc(1, GFP_KERNEL | GFP_DMA); |
1da177e4 LT |
466 | if (device->modeset_byte == NULL) { |
467 | DBF_EXCEPTION(2, "ti:no mem\n"); | |
468 | PRINT_INFO("can't allocate memory for modeset byte\n"); | |
469 | kfree(device); | |
470 | return ERR_PTR(-ENOMEM); | |
471 | } | |
472 | INIT_LIST_HEAD(&device->req_queue); | |
473 | INIT_LIST_HEAD(&device->node); | |
474 | init_waitqueue_head(&device->state_change_wq); | |
475 | device->tape_state = TS_INIT; | |
476 | device->medium_state = MS_UNKNOWN; | |
477 | *device->modeset_byte = 0; | |
478 | device->first_minor = -1; | |
479 | atomic_set(&device->ref_count, 1); | |
c1637532 | 480 | INIT_DELAYED_WORK(&device->tape_dnr, tape_delayed_next_request); |
1da177e4 LT |
481 | |
482 | return device; | |
483 | } | |
484 | ||
485 | /* | |
486 | * Get a reference to an existing device structure. This will automatically | |
487 | * increment the reference count. | |
488 | */ | |
489 | struct tape_device * | |
490 | tape_get_device_reference(struct tape_device *device) | |
491 | { | |
492 | DBF_EVENT(4, "tape_get_device_reference(%p) = %i\n", device, | |
493 | atomic_inc_return(&device->ref_count)); | |
494 | ||
495 | return device; | |
496 | } | |
497 | ||
498 | /* | |
499 | * Decrease the reference counter of a devices structure. If the | |
500 | * reference counter reaches zero free the device structure. | |
501 | * The function returns a NULL pointer to be used by the caller | |
502 | * for clearing reference pointers. | |
503 | */ | |
504 | struct tape_device * | |
505 | tape_put_device(struct tape_device *device) | |
506 | { | |
507 | int remain; | |
508 | ||
509 | remain = atomic_dec_return(&device->ref_count); | |
510 | if (remain > 0) { | |
511 | DBF_EVENT(4, "tape_put_device(%p) -> %i\n", device, remain); | |
512 | } else { | |
513 | if (remain < 0) { | |
514 | DBF_EVENT(4, "put device without reference\n"); | |
515 | PRINT_ERR("put device without reference\n"); | |
516 | } else { | |
517 | DBF_EVENT(4, "tape_free_device(%p)\n", device); | |
518 | kfree(device->modeset_byte); | |
519 | kfree(device); | |
520 | } | |
521 | } | |
522 | ||
523 | return NULL; | |
524 | } | |
525 | ||
526 | /* | |
527 | * Find tape device by a device index. | |
528 | */ | |
529 | struct tape_device * | |
530 | tape_get_device(int devindex) | |
531 | { | |
532 | struct tape_device *device, *tmp; | |
533 | ||
534 | device = ERR_PTR(-ENODEV); | |
535 | read_lock(&tape_device_lock); | |
536 | list_for_each_entry(tmp, &tape_device_list, node) { | |
537 | if (tmp->first_minor / TAPE_MINORS_PER_DEV == devindex) { | |
538 | device = tape_get_device_reference(tmp); | |
539 | break; | |
540 | } | |
541 | } | |
542 | read_unlock(&tape_device_lock); | |
543 | return device; | |
544 | } | |
545 | ||
546 | /* | |
547 | * Driverfs tape probe function. | |
548 | */ | |
549 | int | |
550 | tape_generic_probe(struct ccw_device *cdev) | |
551 | { | |
552 | struct tape_device *device; | |
d7cf0d57 | 553 | int ret; |
1da177e4 LT |
554 | |
555 | device = tape_alloc_device(); | |
556 | if (IS_ERR(device)) | |
557 | return -ENODEV; | |
d7cf0d57 HC |
558 | ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP); |
559 | ret = sysfs_create_group(&cdev->dev.kobj, &tape_attr_group); | |
560 | if (ret) { | |
561 | tape_put_device(device); | |
562 | PRINT_ERR("probe failed for tape device %s\n", cdev->dev.bus_id); | |
563 | return ret; | |
564 | } | |
1da177e4 | 565 | cdev->dev.driver_data = device; |
d7cf0d57 | 566 | cdev->handler = __tape_do_irq; |
1da177e4 LT |
567 | device->cdev = cdev; |
568 | device->cdev_id = busid_to_int(cdev->dev.bus_id); | |
d7cf0d57 HC |
569 | PRINT_INFO("tape device %s found\n", cdev->dev.bus_id); |
570 | return ret; | |
1da177e4 LT |
571 | } |
572 | ||
4d284cac | 573 | static void |
1da177e4 LT |
574 | __tape_discard_requests(struct tape_device *device) |
575 | { | |
576 | struct tape_request * request; | |
577 | struct list_head * l, *n; | |
578 | ||
579 | list_for_each_safe(l, n, &device->req_queue) { | |
580 | request = list_entry(l, struct tape_request, list); | |
581 | if (request->status == TAPE_REQUEST_IN_IO) | |
582 | request->status = TAPE_REQUEST_DONE; | |
583 | list_del(&request->list); | |
584 | ||
585 | /* Decrease ref_count for removed request. */ | |
586 | request->device = tape_put_device(device); | |
587 | request->rc = -EIO; | |
588 | if (request->callback != NULL) | |
589 | request->callback(request, request->callback_data); | |
590 | } | |
591 | } | |
592 | ||
593 | /* | |
594 | * Driverfs tape remove function. | |
595 | * | |
596 | * This function is called whenever the common I/O layer detects the device | |
597 | * gone. This can happen at any time and we cannot refuse. | |
598 | */ | |
599 | void | |
600 | tape_generic_remove(struct ccw_device *cdev) | |
601 | { | |
602 | struct tape_device * device; | |
603 | ||
604 | device = cdev->dev.driver_data; | |
605 | if (!device) { | |
606 | PRINT_ERR("No device pointer in tape_generic_remove!\n"); | |
607 | return; | |
608 | } | |
609 | DBF_LH(3, "(%08x): tape_generic_remove(%p)\n", device->cdev_id, cdev); | |
610 | ||
611 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
612 | switch (device->tape_state) { | |
613 | case TS_INIT: | |
614 | tape_state_set(device, TS_NOT_OPER); | |
615 | case TS_NOT_OPER: | |
616 | /* | |
617 | * Nothing to do. | |
618 | */ | |
619 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
620 | break; | |
621 | case TS_UNUSED: | |
622 | /* | |
623 | * Need only to release the device. | |
624 | */ | |
625 | tape_state_set(device, TS_NOT_OPER); | |
626 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
627 | tape_cleanup_device(device); | |
628 | break; | |
629 | default: | |
630 | /* | |
631 | * There may be requests on the queue. We will not get | |
632 | * an interrupt for a request that was running. So we | |
633 | * just post them all as I/O errors. | |
634 | */ | |
635 | DBF_EVENT(3, "(%08x): Drive in use vanished!\n", | |
636 | device->cdev_id); | |
637 | PRINT_WARN("(%s): Drive in use vanished - " | |
638 | "expect trouble!\n", | |
639 | device->cdev->dev.bus_id); | |
640 | PRINT_WARN("State was %i\n", device->tape_state); | |
641 | tape_state_set(device, TS_NOT_OPER); | |
642 | __tape_discard_requests(device); | |
643 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
644 | tape_cleanup_device(device); | |
645 | } | |
646 | ||
647 | if (cdev->dev.driver_data != NULL) { | |
648 | sysfs_remove_group(&cdev->dev.kobj, &tape_attr_group); | |
649 | cdev->dev.driver_data = tape_put_device(cdev->dev.driver_data); | |
650 | } | |
651 | } | |
652 | ||
653 | /* | |
654 | * Allocate a new tape ccw request | |
655 | */ | |
656 | struct tape_request * | |
657 | tape_alloc_request(int cplength, int datasize) | |
658 | { | |
659 | struct tape_request *request; | |
660 | ||
661 | if (datasize > PAGE_SIZE || (cplength*sizeof(struct ccw1)) > PAGE_SIZE) | |
662 | BUG(); | |
663 | ||
664 | DBF_LH(6, "tape_alloc_request(%d, %d)\n", cplength, datasize); | |
665 | ||
88abaab4 | 666 | request = kzalloc(sizeof(struct tape_request), GFP_KERNEL); |
1da177e4 LT |
667 | if (request == NULL) { |
668 | DBF_EXCEPTION(1, "cqra nomem\n"); | |
669 | return ERR_PTR(-ENOMEM); | |
670 | } | |
1da177e4 LT |
671 | /* allocate channel program */ |
672 | if (cplength > 0) { | |
88abaab4 | 673 | request->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
674 | GFP_ATOMIC | GFP_DMA); |
675 | if (request->cpaddr == NULL) { | |
676 | DBF_EXCEPTION(1, "cqra nomem\n"); | |
677 | kfree(request); | |
678 | return ERR_PTR(-ENOMEM); | |
679 | } | |
1da177e4 LT |
680 | } |
681 | /* alloc small kernel buffer */ | |
682 | if (datasize > 0) { | |
88abaab4 | 683 | request->cpdata = kzalloc(datasize, GFP_KERNEL | GFP_DMA); |
1da177e4 LT |
684 | if (request->cpdata == NULL) { |
685 | DBF_EXCEPTION(1, "cqra nomem\n"); | |
17fd682e | 686 | kfree(request->cpaddr); |
1da177e4 LT |
687 | kfree(request); |
688 | return ERR_PTR(-ENOMEM); | |
689 | } | |
1da177e4 LT |
690 | } |
691 | DBF_LH(6, "New request %p(%p/%p)\n", request, request->cpaddr, | |
692 | request->cpdata); | |
693 | ||
694 | return request; | |
695 | } | |
696 | ||
697 | /* | |
698 | * Free tape ccw request | |
699 | */ | |
700 | void | |
701 | tape_free_request (struct tape_request * request) | |
702 | { | |
703 | DBF_LH(6, "Free request %p\n", request); | |
704 | ||
705 | if (request->device != NULL) { | |
706 | request->device = tape_put_device(request->device); | |
707 | } | |
17fd682e JJ |
708 | kfree(request->cpdata); |
709 | kfree(request->cpaddr); | |
1da177e4 LT |
710 | kfree(request); |
711 | } | |
712 | ||
4d284cac | 713 | static int |
4111796d SB |
714 | __tape_start_io(struct tape_device *device, struct tape_request *request) |
715 | { | |
716 | int rc; | |
717 | ||
718 | #ifdef CONFIG_S390_TAPE_BLOCK | |
719 | if (request->op == TO_BLOCK) | |
720 | device->discipline->check_locate(device, request); | |
721 | #endif | |
722 | rc = ccw_device_start( | |
723 | device->cdev, | |
724 | request->cpaddr, | |
725 | (unsigned long) request, | |
726 | 0x00, | |
727 | request->options | |
728 | ); | |
729 | if (rc == 0) { | |
730 | request->status = TAPE_REQUEST_IN_IO; | |
731 | } else if (rc == -EBUSY) { | |
732 | /* The common I/O subsystem is currently busy. Retry later. */ | |
733 | request->status = TAPE_REQUEST_QUEUED; | |
c1637532 | 734 | schedule_delayed_work(&device->tape_dnr, 0); |
4111796d SB |
735 | rc = 0; |
736 | } else { | |
737 | /* Start failed. Remove request and indicate failure. */ | |
738 | DBF_EVENT(1, "tape: start request failed with RC = %i\n", rc); | |
739 | } | |
740 | return rc; | |
741 | } | |
742 | ||
4d284cac | 743 | static void |
4111796d | 744 | __tape_start_next_request(struct tape_device *device) |
1da177e4 LT |
745 | { |
746 | struct list_head *l, *n; | |
747 | struct tape_request *request; | |
748 | int rc; | |
749 | ||
4111796d | 750 | DBF_LH(6, "__tape_start_next_request(%p)\n", device); |
1da177e4 LT |
751 | /* |
752 | * Try to start each request on request queue until one is | |
753 | * started successful. | |
754 | */ | |
755 | list_for_each_safe(l, n, &device->req_queue) { | |
756 | request = list_entry(l, struct tape_request, list); | |
4111796d SB |
757 | |
758 | /* | |
759 | * Avoid race condition if bottom-half was triggered more than | |
760 | * once. | |
761 | */ | |
762 | if (request->status == TAPE_REQUEST_IN_IO) | |
763 | return; | |
5f384338 MH |
764 | /* |
765 | * Request has already been stopped. We have to wait until | |
766 | * the request is removed from the queue in the interrupt | |
767 | * handling. | |
768 | */ | |
769 | if (request->status == TAPE_REQUEST_DONE) | |
770 | return; | |
4111796d SB |
771 | |
772 | /* | |
773 | * We wanted to cancel the request but the common I/O layer | |
774 | * was busy at that time. This can only happen if this | |
775 | * function is called by delayed_next_request. | |
776 | * Otherwise we start the next request on the queue. | |
777 | */ | |
778 | if (request->status == TAPE_REQUEST_CANCEL) { | |
779 | rc = __tape_cancel_io(device, request); | |
780 | } else { | |
781 | rc = __tape_start_io(device, request); | |
1da177e4 | 782 | } |
4111796d SB |
783 | if (rc == 0) |
784 | return; | |
1da177e4 | 785 | |
4111796d | 786 | /* Set ending status. */ |
1da177e4 LT |
787 | request->rc = rc; |
788 | request->status = TAPE_REQUEST_DONE; | |
4111796d SB |
789 | |
790 | /* Remove from request queue. */ | |
791 | list_del(&request->list); | |
792 | ||
793 | /* Do callback. */ | |
794 | if (request->callback != NULL) | |
795 | request->callback(request, request->callback_data); | |
1da177e4 LT |
796 | } |
797 | } | |
798 | ||
799 | static void | |
c1637532 | 800 | tape_delayed_next_request(struct work_struct *work) |
1da177e4 | 801 | { |
c1637532 MS |
802 | struct tape_device *device = |
803 | container_of(work, struct tape_device, tape_dnr.work); | |
1da177e4 | 804 | |
4111796d SB |
805 | DBF_LH(6, "tape_delayed_next_request(%p)\n", device); |
806 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
807 | __tape_start_next_request(device); | |
808 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
809 | } | |
810 | ||
cced1dd4 MH |
811 | static void tape_long_busy_timeout(unsigned long data) |
812 | { | |
813 | struct tape_request *request; | |
814 | struct tape_device *device; | |
815 | ||
816 | device = (struct tape_device *) data; | |
817 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
818 | request = list_entry(device->req_queue.next, struct tape_request, list); | |
819 | if (request->status != TAPE_REQUEST_LONG_BUSY) | |
820 | BUG(); | |
821 | DBF_LH(6, "%08x: Long busy timeout.\n", device->cdev_id); | |
822 | __tape_start_next_request(device); | |
823 | device->lb_timeout.data = (unsigned long) tape_put_device(device); | |
824 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
825 | } | |
826 | ||
4d284cac | 827 | static void |
4111796d SB |
828 | __tape_end_request( |
829 | struct tape_device * device, | |
830 | struct tape_request * request, | |
831 | int rc) | |
832 | { | |
833 | DBF_LH(6, "__tape_end_request(%p, %p, %i)\n", device, request, rc); | |
834 | if (request) { | |
835 | request->rc = rc; | |
836 | request->status = TAPE_REQUEST_DONE; | |
837 | ||
838 | /* Remove from request queue. */ | |
839 | list_del(&request->list); | |
840 | ||
841 | /* Do callback. */ | |
842 | if (request->callback != NULL) | |
843 | request->callback(request, request->callback_data); | |
844 | } | |
1da177e4 LT |
845 | |
846 | /* Start next request. */ | |
847 | if (!list_empty(&device->req_queue)) | |
4111796d | 848 | __tape_start_next_request(device); |
1da177e4 LT |
849 | } |
850 | ||
851 | /* | |
852 | * Write sense data to console/dbf | |
853 | */ | |
854 | void | |
855 | tape_dump_sense(struct tape_device* device, struct tape_request *request, | |
856 | struct irb *irb) | |
857 | { | |
858 | unsigned int *sptr; | |
859 | ||
860 | PRINT_INFO("-------------------------------------------------\n"); | |
861 | PRINT_INFO("DSTAT : %02x CSTAT: %02x CPA: %04x\n", | |
862 | irb->scsw.dstat, irb->scsw.cstat, irb->scsw.cpa); | |
863 | PRINT_INFO("DEVICE: %s\n", device->cdev->dev.bus_id); | |
864 | if (request != NULL) | |
865 | PRINT_INFO("OP : %s\n", tape_op_verbose[request->op]); | |
866 | ||
867 | sptr = (unsigned int *) irb->ecw; | |
868 | PRINT_INFO("Sense data: %08X %08X %08X %08X \n", | |
869 | sptr[0], sptr[1], sptr[2], sptr[3]); | |
870 | PRINT_INFO("Sense data: %08X %08X %08X %08X \n", | |
871 | sptr[4], sptr[5], sptr[6], sptr[7]); | |
872 | PRINT_INFO("--------------------------------------------------\n"); | |
873 | } | |
874 | ||
875 | /* | |
876 | * Write sense data to dbf | |
877 | */ | |
878 | void | |
879 | tape_dump_sense_dbf(struct tape_device *device, struct tape_request *request, | |
880 | struct irb *irb) | |
881 | { | |
882 | unsigned int *sptr; | |
883 | const char* op; | |
884 | ||
885 | if (request != NULL) | |
886 | op = tape_op_verbose[request->op]; | |
887 | else | |
888 | op = "---"; | |
889 | DBF_EVENT(3, "DSTAT : %02x CSTAT: %02x\n", | |
890 | irb->scsw.dstat,irb->scsw.cstat); | |
891 | DBF_EVENT(3, "DEVICE: %08x OP\t: %s\n", device->cdev_id, op); | |
892 | sptr = (unsigned int *) irb->ecw; | |
893 | DBF_EVENT(3, "%08x %08x\n", sptr[0], sptr[1]); | |
894 | DBF_EVENT(3, "%08x %08x\n", sptr[2], sptr[3]); | |
895 | DBF_EVENT(3, "%08x %08x\n", sptr[4], sptr[5]); | |
896 | DBF_EVENT(3, "%08x %08x\n", sptr[6], sptr[7]); | |
897 | } | |
898 | ||
899 | /* | |
900 | * I/O helper function. Adds the request to the request queue | |
901 | * and starts it if the tape is idle. Has to be called with | |
902 | * the device lock held. | |
903 | */ | |
4d284cac | 904 | static int |
4111796d | 905 | __tape_start_request(struct tape_device *device, struct tape_request *request) |
1da177e4 LT |
906 | { |
907 | int rc; | |
908 | ||
909 | switch (request->op) { | |
910 | case TO_MSEN: | |
911 | case TO_ASSIGN: | |
912 | case TO_UNASSIGN: | |
913 | case TO_READ_ATTMSG: | |
914 | if (device->tape_state == TS_INIT) | |
915 | break; | |
916 | if (device->tape_state == TS_UNUSED) | |
917 | break; | |
918 | default: | |
919 | if (device->tape_state == TS_BLKUSE) | |
920 | break; | |
921 | if (device->tape_state != TS_IN_USE) | |
922 | return -ENODEV; | |
923 | } | |
924 | ||
925 | /* Increase use count of device for the added request. */ | |
926 | request->device = tape_get_device_reference(device); | |
927 | ||
928 | if (list_empty(&device->req_queue)) { | |
929 | /* No other requests are on the queue. Start this one. */ | |
4111796d SB |
930 | rc = __tape_start_io(device, request); |
931 | if (rc) | |
1da177e4 | 932 | return rc; |
4111796d | 933 | |
1da177e4 LT |
934 | DBF_LH(5, "Request %p added for execution.\n", request); |
935 | list_add(&request->list, &device->req_queue); | |
1da177e4 LT |
936 | } else { |
937 | DBF_LH(5, "Request %p add to queue.\n", request); | |
1da177e4 | 938 | request->status = TAPE_REQUEST_QUEUED; |
4111796d | 939 | list_add_tail(&request->list, &device->req_queue); |
1da177e4 LT |
940 | } |
941 | return 0; | |
942 | } | |
943 | ||
944 | /* | |
945 | * Add the request to the request queue, try to start it if the | |
946 | * tape is idle. Return without waiting for end of i/o. | |
947 | */ | |
948 | int | |
949 | tape_do_io_async(struct tape_device *device, struct tape_request *request) | |
950 | { | |
951 | int rc; | |
952 | ||
953 | DBF_LH(6, "tape_do_io_async(%p, %p)\n", device, request); | |
954 | ||
955 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
956 | /* Add request to request queue and try to start it. */ | |
4111796d | 957 | rc = __tape_start_request(device, request); |
1da177e4 LT |
958 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
959 | return rc; | |
960 | } | |
961 | ||
962 | /* | |
963 | * tape_do_io/__tape_wake_up | |
964 | * Add the request to the request queue, try to start it if the | |
965 | * tape is idle and wait uninterruptible for its completion. | |
966 | */ | |
967 | static void | |
968 | __tape_wake_up(struct tape_request *request, void *data) | |
969 | { | |
970 | request->callback = NULL; | |
971 | wake_up((wait_queue_head_t *) data); | |
972 | } | |
973 | ||
974 | int | |
975 | tape_do_io(struct tape_device *device, struct tape_request *request) | |
976 | { | |
977 | wait_queue_head_t wq; | |
978 | int rc; | |
979 | ||
980 | init_waitqueue_head(&wq); | |
981 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
982 | /* Setup callback */ | |
983 | request->callback = __tape_wake_up; | |
984 | request->callback_data = &wq; | |
985 | /* Add request to request queue and try to start it. */ | |
4111796d | 986 | rc = __tape_start_request(device, request); |
1da177e4 LT |
987 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
988 | if (rc) | |
989 | return rc; | |
990 | /* Request added to the queue. Wait for its completion. */ | |
991 | wait_event(wq, (request->callback == NULL)); | |
992 | /* Get rc from request */ | |
993 | return request->rc; | |
994 | } | |
995 | ||
996 | /* | |
997 | * tape_do_io_interruptible/__tape_wake_up_interruptible | |
998 | * Add the request to the request queue, try to start it if the | |
999 | * tape is idle and wait uninterruptible for its completion. | |
1000 | */ | |
1001 | static void | |
1002 | __tape_wake_up_interruptible(struct tape_request *request, void *data) | |
1003 | { | |
1004 | request->callback = NULL; | |
1005 | wake_up_interruptible((wait_queue_head_t *) data); | |
1006 | } | |
1007 | ||
1008 | int | |
1009 | tape_do_io_interruptible(struct tape_device *device, | |
1010 | struct tape_request *request) | |
1011 | { | |
1012 | wait_queue_head_t wq; | |
1013 | int rc; | |
1014 | ||
1015 | init_waitqueue_head(&wq); | |
1016 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1017 | /* Setup callback */ | |
1018 | request->callback = __tape_wake_up_interruptible; | |
1019 | request->callback_data = &wq; | |
4111796d | 1020 | rc = __tape_start_request(device, request); |
1da177e4 LT |
1021 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1022 | if (rc) | |
1023 | return rc; | |
1024 | /* Request added to the queue. Wait for its completion. */ | |
1025 | rc = wait_event_interruptible(wq, (request->callback == NULL)); | |
1026 | if (rc != -ERESTARTSYS) | |
1027 | /* Request finished normally. */ | |
1028 | return request->rc; | |
4111796d | 1029 | |
1da177e4 LT |
1030 | /* Interrupted by a signal. We have to stop the current request. */ |
1031 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
4111796d SB |
1032 | rc = __tape_cancel_io(device, request); |
1033 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 | 1034 | if (rc == 0) { |
4111796d SB |
1035 | /* Wait for the interrupt that acknowledges the halt. */ |
1036 | do { | |
1037 | rc = wait_event_interruptible( | |
1038 | wq, | |
1039 | (request->callback == NULL) | |
1040 | ); | |
4cd190a7 | 1041 | } while (rc == -ERESTARTSYS); |
4111796d | 1042 | |
1da177e4 LT |
1043 | DBF_EVENT(3, "IO stopped on %08x\n", device->cdev_id); |
1044 | rc = -ERESTARTSYS; | |
1045 | } | |
1da177e4 LT |
1046 | return rc; |
1047 | } | |
1048 | ||
5f384338 MH |
1049 | /* |
1050 | * Stop running ccw. | |
1051 | */ | |
1052 | int | |
1053 | tape_cancel_io(struct tape_device *device, struct tape_request *request) | |
1054 | { | |
1055 | int rc; | |
1056 | ||
1057 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1058 | rc = __tape_cancel_io(device, request); | |
1059 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1060 | return rc; | |
1061 | } | |
1062 | ||
1da177e4 LT |
1063 | /* |
1064 | * Tape interrupt routine, called from the ccw_device layer | |
1065 | */ | |
1066 | static void | |
1067 | __tape_do_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb) | |
1068 | { | |
1069 | struct tape_device *device; | |
1070 | struct tape_request *request; | |
1da177e4 LT |
1071 | int rc; |
1072 | ||
1073 | device = (struct tape_device *) cdev->dev.driver_data; | |
1074 | if (device == NULL) { | |
1075 | PRINT_ERR("could not get device structure for %s " | |
1076 | "in interrupt\n", cdev->dev.bus_id); | |
1077 | return; | |
1078 | } | |
1079 | request = (struct tape_request *) intparm; | |
1080 | ||
1081 | DBF_LH(6, "__tape_do_irq(device=%p, request=%p)\n", device, request); | |
1082 | ||
1083 | /* On special conditions irb is an error pointer */ | |
1084 | if (IS_ERR(irb)) { | |
4111796d | 1085 | /* FIXME: What to do with the request? */ |
1da177e4 LT |
1086 | switch (PTR_ERR(irb)) { |
1087 | case -ETIMEDOUT: | |
1088 | PRINT_WARN("(%s): Request timed out\n", | |
1089 | cdev->dev.bus_id); | |
1090 | case -EIO: | |
4111796d | 1091 | __tape_end_request(device, request, -EIO); |
1da177e4 LT |
1092 | break; |
1093 | default: | |
1094 | PRINT_ERR("(%s): Unexpected i/o error %li\n", | |
1095 | cdev->dev.bus_id, | |
1096 | PTR_ERR(irb)); | |
1097 | } | |
1098 | return; | |
1099 | } | |
1100 | ||
4111796d SB |
1101 | /* |
1102 | * If the condition code is not zero and the start function bit is | |
1103 | * still set, this is an deferred error and the last start I/O did | |
842d3fba SB |
1104 | * not succeed. At this point the condition that caused the deferred |
1105 | * error might still apply. So we just schedule the request to be | |
1106 | * started later. | |
4111796d | 1107 | */ |
5f384338 MH |
1108 | if (irb->scsw.cc != 0 && (irb->scsw.fctl & SCSW_FCTL_START_FUNC) && |
1109 | (request->status == TAPE_REQUEST_IN_IO)) { | |
1110 | DBF_EVENT(3,"(%08x): deferred cc=%i, fctl=%i. restarting\n", | |
1111 | device->cdev_id, irb->scsw.cc, irb->scsw.fctl); | |
842d3fba | 1112 | request->status = TAPE_REQUEST_QUEUED; |
5f384338 | 1113 | schedule_delayed_work(&device->tape_dnr, HZ); |
4111796d SB |
1114 | return; |
1115 | } | |
1116 | ||
1da177e4 LT |
1117 | /* May be an unsolicited irq */ |
1118 | if(request != NULL) | |
1119 | request->rescnt = irb->scsw.count; | |
cced1dd4 MH |
1120 | else if ((irb->scsw.dstat == 0x85 || irb->scsw.dstat == 0x80) && |
1121 | !list_empty(&device->req_queue)) { | |
1122 | /* Not Ready to Ready after long busy ? */ | |
1123 | struct tape_request *req; | |
1124 | req = list_entry(device->req_queue.next, | |
1125 | struct tape_request, list); | |
1126 | if (req->status == TAPE_REQUEST_LONG_BUSY) { | |
1127 | DBF_EVENT(3, "(%08x): del timer\n", device->cdev_id); | |
1128 | if (del_timer(&device->lb_timeout)) { | |
1129 | device->lb_timeout.data = (unsigned long) | |
1130 | tape_put_device(device); | |
1131 | __tape_start_next_request(device); | |
1132 | } | |
1133 | return; | |
1134 | } | |
1135 | } | |
1da177e4 LT |
1136 | if (irb->scsw.dstat != 0x0c) { |
1137 | /* Set the 'ONLINE' flag depending on sense byte 1 */ | |
1138 | if(*(((__u8 *) irb->ecw) + 1) & SENSE_DRIVE_ONLINE) | |
1139 | device->tape_generic_status |= GMT_ONLINE(~0); | |
1140 | else | |
1141 | device->tape_generic_status &= ~GMT_ONLINE(~0); | |
1142 | ||
1143 | /* | |
1144 | * Any request that does not come back with channel end | |
1145 | * and device end is unusual. Log the sense data. | |
1146 | */ | |
1147 | DBF_EVENT(3,"-- Tape Interrupthandler --\n"); | |
1148 | tape_dump_sense_dbf(device, request, irb); | |
1149 | } else { | |
1150 | /* Upon normal completion the device _is_ online */ | |
1151 | device->tape_generic_status |= GMT_ONLINE(~0); | |
1152 | } | |
1153 | if (device->tape_state == TS_NOT_OPER) { | |
1154 | DBF_EVENT(6, "tape:device is not operational\n"); | |
1155 | return; | |
1156 | } | |
1157 | ||
1158 | /* | |
1159 | * Request that were canceled still come back with an interrupt. | |
1160 | * To detect these request the state will be set to TAPE_REQUEST_DONE. | |
1161 | */ | |
1162 | if(request != NULL && request->status == TAPE_REQUEST_DONE) { | |
4111796d | 1163 | __tape_end_request(device, request, -EIO); |
1da177e4 LT |
1164 | return; |
1165 | } | |
1166 | ||
1167 | rc = device->discipline->irq(device, request, irb); | |
1168 | /* | |
1169 | * rc < 0 : request finished unsuccessfully. | |
1170 | * rc == TAPE_IO_SUCCESS: request finished successfully. | |
1171 | * rc == TAPE_IO_PENDING: request is still running. Ignore rc. | |
1172 | * rc == TAPE_IO_RETRY: request finished but needs another go. | |
1173 | * rc == TAPE_IO_STOP: request needs to get terminated. | |
1174 | */ | |
1da177e4 | 1175 | switch (rc) { |
4111796d SB |
1176 | case TAPE_IO_SUCCESS: |
1177 | /* Upon normal completion the device _is_ online */ | |
1178 | device->tape_generic_status |= GMT_ONLINE(~0); | |
1179 | __tape_end_request(device, request, rc); | |
1180 | break; | |
1181 | case TAPE_IO_PENDING: | |
1182 | break; | |
cced1dd4 MH |
1183 | case TAPE_IO_LONG_BUSY: |
1184 | device->lb_timeout.data = | |
1185 | (unsigned long)tape_get_device_reference(device); | |
1186 | device->lb_timeout.expires = jiffies + | |
1187 | LONG_BUSY_TIMEOUT * HZ; | |
1188 | DBF_EVENT(3, "(%08x): add timer\n", device->cdev_id); | |
1189 | add_timer(&device->lb_timeout); | |
1190 | request->status = TAPE_REQUEST_LONG_BUSY; | |
1191 | break; | |
4111796d SB |
1192 | case TAPE_IO_RETRY: |
1193 | rc = __tape_start_io(device, request); | |
1194 | if (rc) | |
1195 | __tape_end_request(device, request, rc); | |
1196 | break; | |
1197 | case TAPE_IO_STOP: | |
1198 | rc = __tape_cancel_io(device, request); | |
1199 | if (rc) | |
1200 | __tape_end_request(device, request, rc); | |
1201 | break; | |
1202 | default: | |
1203 | if (rc > 0) { | |
1204 | DBF_EVENT(6, "xunknownrc\n"); | |
1205 | PRINT_ERR("Invalid return code from discipline " | |
1206 | "interrupt function.\n"); | |
1207 | __tape_end_request(device, request, -EIO); | |
1208 | } else { | |
1209 | __tape_end_request(device, request, rc); | |
1210 | } | |
1211 | break; | |
1da177e4 LT |
1212 | } |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * Tape device open function used by tape_char & tape_block frontends. | |
1217 | */ | |
1218 | int | |
1219 | tape_open(struct tape_device *device) | |
1220 | { | |
1221 | int rc; | |
1222 | ||
1223 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1224 | if (device->tape_state == TS_NOT_OPER) { | |
1225 | DBF_EVENT(6, "TAPE:nodev\n"); | |
1226 | rc = -ENODEV; | |
1227 | } else if (device->tape_state == TS_IN_USE) { | |
1228 | DBF_EVENT(6, "TAPE:dbusy\n"); | |
1229 | rc = -EBUSY; | |
1230 | } else if (device->tape_state == TS_BLKUSE) { | |
1231 | DBF_EVENT(6, "TAPE:dbusy\n"); | |
1232 | rc = -EBUSY; | |
1233 | } else if (device->discipline != NULL && | |
1234 | !try_module_get(device->discipline->owner)) { | |
1235 | DBF_EVENT(6, "TAPE:nodisc\n"); | |
1236 | rc = -ENODEV; | |
1237 | } else { | |
1238 | tape_state_set(device, TS_IN_USE); | |
1239 | rc = 0; | |
1240 | } | |
1241 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1242 | return rc; | |
1243 | } | |
1244 | ||
1245 | /* | |
1246 | * Tape device release function used by tape_char & tape_block frontends. | |
1247 | */ | |
1248 | int | |
1249 | tape_release(struct tape_device *device) | |
1250 | { | |
1251 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1252 | if (device->tape_state == TS_IN_USE) | |
1253 | tape_state_set(device, TS_UNUSED); | |
1254 | module_put(device->discipline->owner); | |
1255 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1256 | return 0; | |
1257 | } | |
1258 | ||
1259 | /* | |
1260 | * Execute a magnetic tape command a number of times. | |
1261 | */ | |
1262 | int | |
1263 | tape_mtop(struct tape_device *device, int mt_op, int mt_count) | |
1264 | { | |
1265 | tape_mtop_fn fn; | |
1266 | int rc; | |
1267 | ||
1268 | DBF_EVENT(6, "TAPE:mtio\n"); | |
1269 | DBF_EVENT(6, "TAPE:ioop: %x\n", mt_op); | |
1270 | DBF_EVENT(6, "TAPE:arg: %x\n", mt_count); | |
1271 | ||
1272 | if (mt_op < 0 || mt_op >= TAPE_NR_MTOPS) | |
1273 | return -EINVAL; | |
1274 | fn = device->discipline->mtop_array[mt_op]; | |
1275 | if (fn == NULL) | |
1276 | return -EINVAL; | |
1277 | ||
1278 | /* We assume that the backends can handle count up to 500. */ | |
1279 | if (mt_op == MTBSR || mt_op == MTFSR || mt_op == MTFSF || | |
1280 | mt_op == MTBSF || mt_op == MTFSFM || mt_op == MTBSFM) { | |
1281 | rc = 0; | |
1282 | for (; mt_count > 500; mt_count -= 500) | |
1283 | if ((rc = fn(device, 500)) != 0) | |
1284 | break; | |
1285 | if (rc == 0) | |
1286 | rc = fn(device, mt_count); | |
1287 | } else | |
1288 | rc = fn(device, mt_count); | |
1289 | return rc; | |
1290 | ||
1291 | } | |
1292 | ||
1293 | /* | |
1294 | * Tape init function. | |
1295 | */ | |
1296 | static int | |
1297 | tape_init (void) | |
1298 | { | |
66a464db | 1299 | TAPE_DBF_AREA = debug_register ( "tape", 2, 2, 4*sizeof(long)); |
1da177e4 LT |
1300 | debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view); |
1301 | #ifdef DBF_LIKE_HELL | |
1302 | debug_set_level(TAPE_DBF_AREA, 6); | |
1303 | #endif | |
e018ba1f | 1304 | DBF_EVENT(3, "tape init\n"); |
1da177e4 LT |
1305 | tape_proc_init(); |
1306 | tapechar_init (); | |
1307 | tapeblock_init (); | |
1308 | return 0; | |
1309 | } | |
1310 | ||
1311 | /* | |
1312 | * Tape exit function. | |
1313 | */ | |
1314 | static void | |
1315 | tape_exit(void) | |
1316 | { | |
1317 | DBF_EVENT(6, "tape exit\n"); | |
1318 | ||
1319 | /* Get rid of the frontends */ | |
1320 | tapechar_exit(); | |
1321 | tapeblock_exit(); | |
1322 | tape_proc_cleanup(); | |
1323 | debug_unregister (TAPE_DBF_AREA); | |
1324 | } | |
1325 | ||
1326 | MODULE_AUTHOR("(C) 2001 IBM Deutschland Entwicklung GmbH by Carsten Otte and " | |
1327 | "Michael Holzheu (cotte@de.ibm.com,holzheu@de.ibm.com)"); | |
e018ba1f | 1328 | MODULE_DESCRIPTION("Linux on zSeries channel attached tape device driver"); |
1da177e4 LT |
1329 | MODULE_LICENSE("GPL"); |
1330 | ||
1331 | module_init(tape_init); | |
1332 | module_exit(tape_exit); | |
1333 | ||
1334 | EXPORT_SYMBOL(tape_generic_remove); | |
1335 | EXPORT_SYMBOL(tape_generic_probe); | |
1336 | EXPORT_SYMBOL(tape_generic_online); | |
1337 | EXPORT_SYMBOL(tape_generic_offline); | |
1338 | EXPORT_SYMBOL(tape_put_device); | |
1339 | EXPORT_SYMBOL(tape_get_device_reference); | |
1340 | EXPORT_SYMBOL(tape_state_verbose); | |
1341 | EXPORT_SYMBOL(tape_op_verbose); | |
1342 | EXPORT_SYMBOL(tape_state_set); | |
1343 | EXPORT_SYMBOL(tape_med_state_set); | |
1344 | EXPORT_SYMBOL(tape_alloc_request); | |
1345 | EXPORT_SYMBOL(tape_free_request); | |
1346 | EXPORT_SYMBOL(tape_dump_sense); | |
1347 | EXPORT_SYMBOL(tape_dump_sense_dbf); | |
1348 | EXPORT_SYMBOL(tape_do_io); | |
1349 | EXPORT_SYMBOL(tape_do_io_async); | |
1350 | EXPORT_SYMBOL(tape_do_io_interruptible); | |
5f384338 | 1351 | EXPORT_SYMBOL(tape_cancel_io); |
1da177e4 | 1352 | EXPORT_SYMBOL(tape_mtop); |