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 | */ | |
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); | |
217 | PRINT_INFO("(%s): Tape is unloaded\n", | |
218 | device->cdev->dev.bus_id); | |
219 | break; | |
220 | case MS_LOADED: | |
221 | device->tape_generic_status &= ~GMT_DR_OPEN(~0); | |
222 | PRINT_INFO("(%s): Tape has been mounted\n", | |
223 | device->cdev->dev.bus_id); | |
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)) { | |
336 | PRINT_ERR("Cannot get module. Module gone.\n"); | |
337 | return -EINVAL; | |
338 | } | |
339 | ||
340 | rc = discipline->setup_device(device); | |
341 | if (rc) | |
342 | goto out; | |
343 | rc = tape_assign_minor(device); | |
344 | if (rc) | |
345 | goto out_discipline; | |
346 | ||
347 | rc = tapechar_setup_device(device); | |
348 | if (rc) | |
349 | goto out_minor; | |
350 | rc = tapeblock_setup_device(device); | |
351 | if (rc) | |
352 | goto out_char; | |
353 | ||
354 | tape_state_set(device, TS_UNUSED); | |
355 | ||
356 | DBF_LH(3, "(%08x): Drive set online\n", device->cdev_id); | |
357 | ||
358 | return 0; | |
359 | ||
360 | out_char: | |
361 | tapechar_cleanup_device(device); | |
362 | out_discipline: | |
363 | device->discipline->cleanup_device(device); | |
364 | device->discipline = NULL; | |
365 | out_minor: | |
366 | tape_remove_minor(device); | |
367 | out: | |
368 | module_put(discipline->owner); | |
369 | return rc; | |
370 | } | |
371 | ||
4d284cac | 372 | static void |
1da177e4 LT |
373 | tape_cleanup_device(struct tape_device *device) |
374 | { | |
375 | tapeblock_cleanup_device(device); | |
376 | tapechar_cleanup_device(device); | |
377 | device->discipline->cleanup_device(device); | |
378 | module_put(device->discipline->owner); | |
379 | tape_remove_minor(device); | |
380 | tape_med_state_set(device, MS_UNKNOWN); | |
381 | } | |
382 | ||
383 | /* | |
384 | * Set device offline. | |
385 | * | |
386 | * Called by the common I/O layer if the drive should set offline on user | |
387 | * request. We may prevent this by returning an error. | |
388 | * Manual offline is only allowed while the drive is not in use. | |
389 | */ | |
390 | int | |
391 | tape_generic_offline(struct tape_device *device) | |
392 | { | |
393 | if (!device) { | |
394 | PRINT_ERR("tape_generic_offline: no such device\n"); | |
395 | return -ENODEV; | |
396 | } | |
397 | ||
398 | DBF_LH(3, "(%08x): tape_generic_offline(%p)\n", | |
399 | device->cdev_id, device); | |
400 | ||
401 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
402 | switch (device->tape_state) { | |
403 | case TS_INIT: | |
404 | case TS_NOT_OPER: | |
405 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
406 | break; | |
407 | case TS_UNUSED: | |
408 | tape_state_set(device, TS_INIT); | |
409 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
410 | tape_cleanup_device(device); | |
411 | break; | |
412 | default: | |
413 | DBF_EVENT(3, "(%08x): Set offline failed " | |
414 | "- drive in use.\n", | |
415 | device->cdev_id); | |
416 | PRINT_WARN("(%s): Set offline failed " | |
417 | "- drive in use.\n", | |
418 | device->cdev->dev.bus_id); | |
419 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
420 | return -EBUSY; | |
421 | } | |
422 | ||
423 | DBF_LH(3, "(%08x): Drive set offline.\n", device->cdev_id); | |
424 | return 0; | |
425 | } | |
426 | ||
427 | /* | |
428 | * Allocate memory for a new device structure. | |
429 | */ | |
430 | static struct tape_device * | |
431 | tape_alloc_device(void) | |
432 | { | |
433 | struct tape_device *device; | |
434 | ||
88abaab4 | 435 | device = kzalloc(sizeof(struct tape_device), GFP_KERNEL); |
1da177e4 LT |
436 | if (device == NULL) { |
437 | DBF_EXCEPTION(2, "ti:no mem\n"); | |
438 | PRINT_INFO ("can't allocate memory for " | |
439 | "tape info structure\n"); | |
440 | return ERR_PTR(-ENOMEM); | |
441 | } | |
88abaab4 | 442 | device->modeset_byte = kmalloc(1, GFP_KERNEL | GFP_DMA); |
1da177e4 LT |
443 | if (device->modeset_byte == NULL) { |
444 | DBF_EXCEPTION(2, "ti:no mem\n"); | |
445 | PRINT_INFO("can't allocate memory for modeset byte\n"); | |
446 | kfree(device); | |
447 | return ERR_PTR(-ENOMEM); | |
448 | } | |
449 | INIT_LIST_HEAD(&device->req_queue); | |
450 | INIT_LIST_HEAD(&device->node); | |
451 | init_waitqueue_head(&device->state_change_wq); | |
4657fb8a | 452 | init_waitqueue_head(&device->wait_queue); |
1da177e4 LT |
453 | device->tape_state = TS_INIT; |
454 | device->medium_state = MS_UNKNOWN; | |
455 | *device->modeset_byte = 0; | |
456 | device->first_minor = -1; | |
457 | atomic_set(&device->ref_count, 1); | |
c1637532 | 458 | INIT_DELAYED_WORK(&device->tape_dnr, tape_delayed_next_request); |
1da177e4 LT |
459 | |
460 | return device; | |
461 | } | |
462 | ||
463 | /* | |
464 | * Get a reference to an existing device structure. This will automatically | |
465 | * increment the reference count. | |
466 | */ | |
467 | struct tape_device * | |
468 | tape_get_device_reference(struct tape_device *device) | |
469 | { | |
470 | DBF_EVENT(4, "tape_get_device_reference(%p) = %i\n", device, | |
471 | atomic_inc_return(&device->ref_count)); | |
472 | ||
473 | return device; | |
474 | } | |
475 | ||
476 | /* | |
477 | * Decrease the reference counter of a devices structure. If the | |
478 | * reference counter reaches zero free the device structure. | |
479 | * The function returns a NULL pointer to be used by the caller | |
480 | * for clearing reference pointers. | |
481 | */ | |
482 | struct tape_device * | |
483 | tape_put_device(struct tape_device *device) | |
484 | { | |
485 | int remain; | |
486 | ||
487 | remain = atomic_dec_return(&device->ref_count); | |
488 | if (remain > 0) { | |
489 | DBF_EVENT(4, "tape_put_device(%p) -> %i\n", device, remain); | |
490 | } else { | |
491 | if (remain < 0) { | |
492 | DBF_EVENT(4, "put device without reference\n"); | |
493 | PRINT_ERR("put device without reference\n"); | |
494 | } else { | |
495 | DBF_EVENT(4, "tape_free_device(%p)\n", device); | |
496 | kfree(device->modeset_byte); | |
497 | kfree(device); | |
498 | } | |
499 | } | |
500 | ||
501 | return NULL; | |
502 | } | |
503 | ||
504 | /* | |
505 | * Find tape device by a device index. | |
506 | */ | |
507 | struct tape_device * | |
508 | tape_get_device(int devindex) | |
509 | { | |
510 | struct tape_device *device, *tmp; | |
511 | ||
512 | device = ERR_PTR(-ENODEV); | |
513 | read_lock(&tape_device_lock); | |
514 | list_for_each_entry(tmp, &tape_device_list, node) { | |
515 | if (tmp->first_minor / TAPE_MINORS_PER_DEV == devindex) { | |
516 | device = tape_get_device_reference(tmp); | |
517 | break; | |
518 | } | |
519 | } | |
520 | read_unlock(&tape_device_lock); | |
521 | return device; | |
522 | } | |
523 | ||
524 | /* | |
525 | * Driverfs tape probe function. | |
526 | */ | |
527 | int | |
528 | tape_generic_probe(struct ccw_device *cdev) | |
529 | { | |
530 | struct tape_device *device; | |
d7cf0d57 | 531 | int ret; |
f455adcf | 532 | struct ccw_dev_id dev_id; |
1da177e4 LT |
533 | |
534 | device = tape_alloc_device(); | |
535 | if (IS_ERR(device)) | |
536 | return -ENODEV; | |
d7cf0d57 HC |
537 | ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP); |
538 | ret = sysfs_create_group(&cdev->dev.kobj, &tape_attr_group); | |
539 | if (ret) { | |
540 | tape_put_device(device); | |
541 | PRINT_ERR("probe failed for tape device %s\n", cdev->dev.bus_id); | |
542 | return ret; | |
543 | } | |
1da177e4 | 544 | cdev->dev.driver_data = device; |
d7cf0d57 | 545 | cdev->handler = __tape_do_irq; |
1da177e4 | 546 | device->cdev = cdev; |
f455adcf CH |
547 | ccw_device_get_id(cdev, &dev_id); |
548 | device->cdev_id = devid_to_int(&dev_id); | |
d7cf0d57 HC |
549 | PRINT_INFO("tape device %s found\n", cdev->dev.bus_id); |
550 | return ret; | |
1da177e4 LT |
551 | } |
552 | ||
4d284cac | 553 | static void |
1da177e4 LT |
554 | __tape_discard_requests(struct tape_device *device) |
555 | { | |
556 | struct tape_request * request; | |
557 | struct list_head * l, *n; | |
558 | ||
559 | list_for_each_safe(l, n, &device->req_queue) { | |
560 | request = list_entry(l, struct tape_request, list); | |
561 | if (request->status == TAPE_REQUEST_IN_IO) | |
562 | request->status = TAPE_REQUEST_DONE; | |
563 | list_del(&request->list); | |
564 | ||
565 | /* Decrease ref_count for removed request. */ | |
566 | request->device = tape_put_device(device); | |
567 | request->rc = -EIO; | |
568 | if (request->callback != NULL) | |
569 | request->callback(request, request->callback_data); | |
570 | } | |
571 | } | |
572 | ||
573 | /* | |
574 | * Driverfs tape remove function. | |
575 | * | |
576 | * This function is called whenever the common I/O layer detects the device | |
577 | * gone. This can happen at any time and we cannot refuse. | |
578 | */ | |
579 | void | |
580 | tape_generic_remove(struct ccw_device *cdev) | |
581 | { | |
582 | struct tape_device * device; | |
583 | ||
584 | device = cdev->dev.driver_data; | |
585 | if (!device) { | |
586 | PRINT_ERR("No device pointer in tape_generic_remove!\n"); | |
587 | return; | |
588 | } | |
589 | DBF_LH(3, "(%08x): tape_generic_remove(%p)\n", device->cdev_id, cdev); | |
590 | ||
591 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
592 | switch (device->tape_state) { | |
593 | case TS_INIT: | |
594 | tape_state_set(device, TS_NOT_OPER); | |
595 | case TS_NOT_OPER: | |
596 | /* | |
597 | * Nothing to do. | |
598 | */ | |
599 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
600 | break; | |
601 | case TS_UNUSED: | |
602 | /* | |
603 | * Need only to release the device. | |
604 | */ | |
605 | tape_state_set(device, TS_NOT_OPER); | |
606 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
607 | tape_cleanup_device(device); | |
608 | break; | |
609 | default: | |
610 | /* | |
611 | * There may be requests on the queue. We will not get | |
612 | * an interrupt for a request that was running. So we | |
613 | * just post them all as I/O errors. | |
614 | */ | |
615 | DBF_EVENT(3, "(%08x): Drive in use vanished!\n", | |
616 | device->cdev_id); | |
617 | PRINT_WARN("(%s): Drive in use vanished - " | |
618 | "expect trouble!\n", | |
619 | device->cdev->dev.bus_id); | |
620 | PRINT_WARN("State was %i\n", device->tape_state); | |
621 | tape_state_set(device, TS_NOT_OPER); | |
622 | __tape_discard_requests(device); | |
623 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
624 | tape_cleanup_device(device); | |
625 | } | |
626 | ||
627 | if (cdev->dev.driver_data != NULL) { | |
628 | sysfs_remove_group(&cdev->dev.kobj, &tape_attr_group); | |
629 | cdev->dev.driver_data = tape_put_device(cdev->dev.driver_data); | |
630 | } | |
631 | } | |
632 | ||
633 | /* | |
634 | * Allocate a new tape ccw request | |
635 | */ | |
636 | struct tape_request * | |
637 | tape_alloc_request(int cplength, int datasize) | |
638 | { | |
639 | struct tape_request *request; | |
640 | ||
641 | if (datasize > PAGE_SIZE || (cplength*sizeof(struct ccw1)) > PAGE_SIZE) | |
642 | BUG(); | |
643 | ||
644 | DBF_LH(6, "tape_alloc_request(%d, %d)\n", cplength, datasize); | |
645 | ||
88abaab4 | 646 | request = kzalloc(sizeof(struct tape_request), GFP_KERNEL); |
1da177e4 LT |
647 | if (request == NULL) { |
648 | DBF_EXCEPTION(1, "cqra nomem\n"); | |
649 | return ERR_PTR(-ENOMEM); | |
650 | } | |
1da177e4 LT |
651 | /* allocate channel program */ |
652 | if (cplength > 0) { | |
88abaab4 | 653 | request->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
654 | GFP_ATOMIC | GFP_DMA); |
655 | if (request->cpaddr == NULL) { | |
656 | DBF_EXCEPTION(1, "cqra nomem\n"); | |
657 | kfree(request); | |
658 | return ERR_PTR(-ENOMEM); | |
659 | } | |
1da177e4 LT |
660 | } |
661 | /* alloc small kernel buffer */ | |
662 | if (datasize > 0) { | |
88abaab4 | 663 | request->cpdata = kzalloc(datasize, GFP_KERNEL | GFP_DMA); |
1da177e4 LT |
664 | if (request->cpdata == NULL) { |
665 | DBF_EXCEPTION(1, "cqra nomem\n"); | |
17fd682e | 666 | kfree(request->cpaddr); |
1da177e4 LT |
667 | kfree(request); |
668 | return ERR_PTR(-ENOMEM); | |
669 | } | |
1da177e4 LT |
670 | } |
671 | DBF_LH(6, "New request %p(%p/%p)\n", request, request->cpaddr, | |
672 | request->cpdata); | |
673 | ||
674 | return request; | |
675 | } | |
676 | ||
677 | /* | |
678 | * Free tape ccw request | |
679 | */ | |
680 | void | |
681 | tape_free_request (struct tape_request * request) | |
682 | { | |
683 | DBF_LH(6, "Free request %p\n", request); | |
684 | ||
685 | if (request->device != NULL) { | |
686 | request->device = tape_put_device(request->device); | |
687 | } | |
17fd682e JJ |
688 | kfree(request->cpdata); |
689 | kfree(request->cpaddr); | |
1da177e4 LT |
690 | kfree(request); |
691 | } | |
692 | ||
4d284cac | 693 | static int |
4111796d SB |
694 | __tape_start_io(struct tape_device *device, struct tape_request *request) |
695 | { | |
696 | int rc; | |
697 | ||
698 | #ifdef CONFIG_S390_TAPE_BLOCK | |
699 | if (request->op == TO_BLOCK) | |
700 | device->discipline->check_locate(device, request); | |
701 | #endif | |
702 | rc = ccw_device_start( | |
703 | device->cdev, | |
704 | request->cpaddr, | |
705 | (unsigned long) request, | |
706 | 0x00, | |
707 | request->options | |
708 | ); | |
709 | if (rc == 0) { | |
710 | request->status = TAPE_REQUEST_IN_IO; | |
711 | } else if (rc == -EBUSY) { | |
712 | /* The common I/O subsystem is currently busy. Retry later. */ | |
713 | request->status = TAPE_REQUEST_QUEUED; | |
c1637532 | 714 | schedule_delayed_work(&device->tape_dnr, 0); |
4111796d SB |
715 | rc = 0; |
716 | } else { | |
717 | /* Start failed. Remove request and indicate failure. */ | |
718 | DBF_EVENT(1, "tape: start request failed with RC = %i\n", rc); | |
719 | } | |
720 | return rc; | |
721 | } | |
722 | ||
4d284cac | 723 | static void |
4111796d | 724 | __tape_start_next_request(struct tape_device *device) |
1da177e4 LT |
725 | { |
726 | struct list_head *l, *n; | |
727 | struct tape_request *request; | |
728 | int rc; | |
729 | ||
4111796d | 730 | DBF_LH(6, "__tape_start_next_request(%p)\n", device); |
1da177e4 LT |
731 | /* |
732 | * Try to start each request on request queue until one is | |
733 | * started successful. | |
734 | */ | |
735 | list_for_each_safe(l, n, &device->req_queue) { | |
736 | request = list_entry(l, struct tape_request, list); | |
4111796d SB |
737 | |
738 | /* | |
739 | * Avoid race condition if bottom-half was triggered more than | |
740 | * once. | |
741 | */ | |
742 | if (request->status == TAPE_REQUEST_IN_IO) | |
743 | return; | |
5f384338 MH |
744 | /* |
745 | * Request has already been stopped. We have to wait until | |
746 | * the request is removed from the queue in the interrupt | |
747 | * handling. | |
748 | */ | |
749 | if (request->status == TAPE_REQUEST_DONE) | |
750 | return; | |
4111796d SB |
751 | |
752 | /* | |
753 | * We wanted to cancel the request but the common I/O layer | |
754 | * was busy at that time. This can only happen if this | |
755 | * function is called by delayed_next_request. | |
756 | * Otherwise we start the next request on the queue. | |
757 | */ | |
758 | if (request->status == TAPE_REQUEST_CANCEL) { | |
759 | rc = __tape_cancel_io(device, request); | |
760 | } else { | |
761 | rc = __tape_start_io(device, request); | |
1da177e4 | 762 | } |
4111796d SB |
763 | if (rc == 0) |
764 | return; | |
1da177e4 | 765 | |
4111796d | 766 | /* Set ending status. */ |
1da177e4 LT |
767 | request->rc = rc; |
768 | request->status = TAPE_REQUEST_DONE; | |
4111796d SB |
769 | |
770 | /* Remove from request queue. */ | |
771 | list_del(&request->list); | |
772 | ||
773 | /* Do callback. */ | |
774 | if (request->callback != NULL) | |
775 | request->callback(request, request->callback_data); | |
1da177e4 LT |
776 | } |
777 | } | |
778 | ||
779 | static void | |
c1637532 | 780 | tape_delayed_next_request(struct work_struct *work) |
1da177e4 | 781 | { |
c1637532 MS |
782 | struct tape_device *device = |
783 | container_of(work, struct tape_device, tape_dnr.work); | |
1da177e4 | 784 | |
4111796d SB |
785 | DBF_LH(6, "tape_delayed_next_request(%p)\n", device); |
786 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
787 | __tape_start_next_request(device); | |
788 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
789 | } | |
790 | ||
cced1dd4 MH |
791 | static void tape_long_busy_timeout(unsigned long data) |
792 | { | |
793 | struct tape_request *request; | |
794 | struct tape_device *device; | |
795 | ||
796 | device = (struct tape_device *) data; | |
797 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
798 | request = list_entry(device->req_queue.next, struct tape_request, list); | |
799 | if (request->status != TAPE_REQUEST_LONG_BUSY) | |
800 | BUG(); | |
801 | DBF_LH(6, "%08x: Long busy timeout.\n", device->cdev_id); | |
802 | __tape_start_next_request(device); | |
803 | device->lb_timeout.data = (unsigned long) tape_put_device(device); | |
804 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
805 | } | |
806 | ||
4d284cac | 807 | static void |
4111796d SB |
808 | __tape_end_request( |
809 | struct tape_device * device, | |
810 | struct tape_request * request, | |
811 | int rc) | |
812 | { | |
813 | DBF_LH(6, "__tape_end_request(%p, %p, %i)\n", device, request, rc); | |
814 | if (request) { | |
815 | request->rc = rc; | |
816 | request->status = TAPE_REQUEST_DONE; | |
817 | ||
818 | /* Remove from request queue. */ | |
819 | list_del(&request->list); | |
820 | ||
821 | /* Do callback. */ | |
822 | if (request->callback != NULL) | |
823 | request->callback(request, request->callback_data); | |
824 | } | |
1da177e4 LT |
825 | |
826 | /* Start next request. */ | |
827 | if (!list_empty(&device->req_queue)) | |
4111796d | 828 | __tape_start_next_request(device); |
1da177e4 LT |
829 | } |
830 | ||
831 | /* | |
832 | * Write sense data to console/dbf | |
833 | */ | |
834 | void | |
835 | tape_dump_sense(struct tape_device* device, struct tape_request *request, | |
836 | struct irb *irb) | |
837 | { | |
838 | unsigned int *sptr; | |
839 | ||
840 | PRINT_INFO("-------------------------------------------------\n"); | |
841 | PRINT_INFO("DSTAT : %02x CSTAT: %02x CPA: %04x\n", | |
23d805b6 | 842 | irb->scsw.cmd.dstat, irb->scsw.cmd.cstat, irb->scsw.cmd.cpa); |
1da177e4 LT |
843 | PRINT_INFO("DEVICE: %s\n", device->cdev->dev.bus_id); |
844 | if (request != NULL) | |
845 | PRINT_INFO("OP : %s\n", tape_op_verbose[request->op]); | |
846 | ||
847 | sptr = (unsigned int *) irb->ecw; | |
848 | PRINT_INFO("Sense data: %08X %08X %08X %08X \n", | |
849 | sptr[0], sptr[1], sptr[2], sptr[3]); | |
850 | PRINT_INFO("Sense data: %08X %08X %08X %08X \n", | |
851 | sptr[4], sptr[5], sptr[6], sptr[7]); | |
852 | PRINT_INFO("--------------------------------------------------\n"); | |
853 | } | |
854 | ||
855 | /* | |
856 | * Write sense data to dbf | |
857 | */ | |
858 | void | |
859 | tape_dump_sense_dbf(struct tape_device *device, struct tape_request *request, | |
860 | struct irb *irb) | |
861 | { | |
862 | unsigned int *sptr; | |
863 | const char* op; | |
864 | ||
865 | if (request != NULL) | |
866 | op = tape_op_verbose[request->op]; | |
867 | else | |
868 | op = "---"; | |
869 | DBF_EVENT(3, "DSTAT : %02x CSTAT: %02x\n", | |
23d805b6 | 870 | irb->scsw.cmd.dstat, irb->scsw.cmd.cstat); |
1da177e4 LT |
871 | DBF_EVENT(3, "DEVICE: %08x OP\t: %s\n", device->cdev_id, op); |
872 | sptr = (unsigned int *) irb->ecw; | |
873 | DBF_EVENT(3, "%08x %08x\n", sptr[0], sptr[1]); | |
874 | DBF_EVENT(3, "%08x %08x\n", sptr[2], sptr[3]); | |
875 | DBF_EVENT(3, "%08x %08x\n", sptr[4], sptr[5]); | |
876 | DBF_EVENT(3, "%08x %08x\n", sptr[6], sptr[7]); | |
877 | } | |
878 | ||
879 | /* | |
880 | * I/O helper function. Adds the request to the request queue | |
881 | * and starts it if the tape is idle. Has to be called with | |
882 | * the device lock held. | |
883 | */ | |
4d284cac | 884 | static int |
4111796d | 885 | __tape_start_request(struct tape_device *device, struct tape_request *request) |
1da177e4 LT |
886 | { |
887 | int rc; | |
888 | ||
889 | switch (request->op) { | |
890 | case TO_MSEN: | |
891 | case TO_ASSIGN: | |
892 | case TO_UNASSIGN: | |
893 | case TO_READ_ATTMSG: | |
e2963062 | 894 | case TO_RDC: |
1da177e4 LT |
895 | if (device->tape_state == TS_INIT) |
896 | break; | |
897 | if (device->tape_state == TS_UNUSED) | |
898 | break; | |
899 | default: | |
900 | if (device->tape_state == TS_BLKUSE) | |
901 | break; | |
902 | if (device->tape_state != TS_IN_USE) | |
903 | return -ENODEV; | |
904 | } | |
905 | ||
906 | /* Increase use count of device for the added request. */ | |
907 | request->device = tape_get_device_reference(device); | |
908 | ||
909 | if (list_empty(&device->req_queue)) { | |
910 | /* No other requests are on the queue. Start this one. */ | |
4111796d SB |
911 | rc = __tape_start_io(device, request); |
912 | if (rc) | |
1da177e4 | 913 | return rc; |
4111796d | 914 | |
1da177e4 LT |
915 | DBF_LH(5, "Request %p added for execution.\n", request); |
916 | list_add(&request->list, &device->req_queue); | |
1da177e4 LT |
917 | } else { |
918 | DBF_LH(5, "Request %p add to queue.\n", request); | |
1da177e4 | 919 | request->status = TAPE_REQUEST_QUEUED; |
4111796d | 920 | list_add_tail(&request->list, &device->req_queue); |
1da177e4 LT |
921 | } |
922 | return 0; | |
923 | } | |
924 | ||
925 | /* | |
926 | * Add the request to the request queue, try to start it if the | |
927 | * tape is idle. Return without waiting for end of i/o. | |
928 | */ | |
929 | int | |
930 | tape_do_io_async(struct tape_device *device, struct tape_request *request) | |
931 | { | |
932 | int rc; | |
933 | ||
934 | DBF_LH(6, "tape_do_io_async(%p, %p)\n", device, request); | |
935 | ||
936 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
937 | /* Add request to request queue and try to start it. */ | |
4111796d | 938 | rc = __tape_start_request(device, request); |
1da177e4 LT |
939 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
940 | return rc; | |
941 | } | |
942 | ||
943 | /* | |
944 | * tape_do_io/__tape_wake_up | |
945 | * Add the request to the request queue, try to start it if the | |
946 | * tape is idle and wait uninterruptible for its completion. | |
947 | */ | |
948 | static void | |
949 | __tape_wake_up(struct tape_request *request, void *data) | |
950 | { | |
951 | request->callback = NULL; | |
952 | wake_up((wait_queue_head_t *) data); | |
953 | } | |
954 | ||
955 | int | |
956 | tape_do_io(struct tape_device *device, struct tape_request *request) | |
957 | { | |
1da177e4 LT |
958 | int rc; |
959 | ||
1da177e4 LT |
960 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
961 | /* Setup callback */ | |
962 | request->callback = __tape_wake_up; | |
4657fb8a | 963 | request->callback_data = &device->wait_queue; |
1da177e4 | 964 | /* Add request to request queue and try to start it. */ |
4111796d | 965 | rc = __tape_start_request(device, request); |
1da177e4 LT |
966 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
967 | if (rc) | |
968 | return rc; | |
969 | /* Request added to the queue. Wait for its completion. */ | |
4657fb8a | 970 | wait_event(device->wait_queue, (request->callback == NULL)); |
1da177e4 LT |
971 | /* Get rc from request */ |
972 | return request->rc; | |
973 | } | |
974 | ||
975 | /* | |
976 | * tape_do_io_interruptible/__tape_wake_up_interruptible | |
977 | * Add the request to the request queue, try to start it if the | |
978 | * tape is idle and wait uninterruptible for its completion. | |
979 | */ | |
980 | static void | |
981 | __tape_wake_up_interruptible(struct tape_request *request, void *data) | |
982 | { | |
983 | request->callback = NULL; | |
984 | wake_up_interruptible((wait_queue_head_t *) data); | |
985 | } | |
986 | ||
987 | int | |
988 | tape_do_io_interruptible(struct tape_device *device, | |
989 | struct tape_request *request) | |
990 | { | |
1da177e4 LT |
991 | int rc; |
992 | ||
1da177e4 LT |
993 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
994 | /* Setup callback */ | |
995 | request->callback = __tape_wake_up_interruptible; | |
4657fb8a | 996 | request->callback_data = &device->wait_queue; |
4111796d | 997 | rc = __tape_start_request(device, request); |
1da177e4 LT |
998 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
999 | if (rc) | |
1000 | return rc; | |
1001 | /* Request added to the queue. Wait for its completion. */ | |
4657fb8a MS |
1002 | rc = wait_event_interruptible(device->wait_queue, |
1003 | (request->callback == NULL)); | |
1da177e4 LT |
1004 | if (rc != -ERESTARTSYS) |
1005 | /* Request finished normally. */ | |
1006 | return request->rc; | |
4111796d | 1007 | |
1da177e4 LT |
1008 | /* Interrupted by a signal. We have to stop the current request. */ |
1009 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
4111796d SB |
1010 | rc = __tape_cancel_io(device, request); |
1011 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 | 1012 | if (rc == 0) { |
4111796d SB |
1013 | /* Wait for the interrupt that acknowledges the halt. */ |
1014 | do { | |
1015 | rc = wait_event_interruptible( | |
4657fb8a | 1016 | device->wait_queue, |
4111796d SB |
1017 | (request->callback == NULL) |
1018 | ); | |
4cd190a7 | 1019 | } while (rc == -ERESTARTSYS); |
4111796d | 1020 | |
1da177e4 LT |
1021 | DBF_EVENT(3, "IO stopped on %08x\n", device->cdev_id); |
1022 | rc = -ERESTARTSYS; | |
1023 | } | |
1da177e4 LT |
1024 | return rc; |
1025 | } | |
1026 | ||
5f384338 MH |
1027 | /* |
1028 | * Stop running ccw. | |
1029 | */ | |
1030 | int | |
1031 | tape_cancel_io(struct tape_device *device, struct tape_request *request) | |
1032 | { | |
1033 | int rc; | |
1034 | ||
1035 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1036 | rc = __tape_cancel_io(device, request); | |
1037 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1038 | return rc; | |
1039 | } | |
1040 | ||
1da177e4 LT |
1041 | /* |
1042 | * Tape interrupt routine, called from the ccw_device layer | |
1043 | */ | |
1044 | static void | |
1045 | __tape_do_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb) | |
1046 | { | |
1047 | struct tape_device *device; | |
1048 | struct tape_request *request; | |
1da177e4 LT |
1049 | int rc; |
1050 | ||
1051 | device = (struct tape_device *) cdev->dev.driver_data; | |
1052 | if (device == NULL) { | |
1053 | PRINT_ERR("could not get device structure for %s " | |
1054 | "in interrupt\n", cdev->dev.bus_id); | |
1055 | return; | |
1056 | } | |
1057 | request = (struct tape_request *) intparm; | |
1058 | ||
1059 | DBF_LH(6, "__tape_do_irq(device=%p, request=%p)\n", device, request); | |
1060 | ||
1061 | /* On special conditions irb is an error pointer */ | |
1062 | if (IS_ERR(irb)) { | |
4111796d | 1063 | /* FIXME: What to do with the request? */ |
1da177e4 LT |
1064 | switch (PTR_ERR(irb)) { |
1065 | case -ETIMEDOUT: | |
1066 | PRINT_WARN("(%s): Request timed out\n", | |
1067 | cdev->dev.bus_id); | |
1068 | case -EIO: | |
4111796d | 1069 | __tape_end_request(device, request, -EIO); |
1da177e4 LT |
1070 | break; |
1071 | default: | |
1072 | PRINT_ERR("(%s): Unexpected i/o error %li\n", | |
1073 | cdev->dev.bus_id, | |
1074 | PTR_ERR(irb)); | |
1075 | } | |
1076 | return; | |
1077 | } | |
1078 | ||
4111796d SB |
1079 | /* |
1080 | * If the condition code is not zero and the start function bit is | |
1081 | * still set, this is an deferred error and the last start I/O did | |
842d3fba SB |
1082 | * not succeed. At this point the condition that caused the deferred |
1083 | * error might still apply. So we just schedule the request to be | |
1084 | * started later. | |
4111796d | 1085 | */ |
23d805b6 PO |
1086 | if (irb->scsw.cmd.cc != 0 && |
1087 | (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) && | |
5f384338 MH |
1088 | (request->status == TAPE_REQUEST_IN_IO)) { |
1089 | DBF_EVENT(3,"(%08x): deferred cc=%i, fctl=%i. restarting\n", | |
23d805b6 | 1090 | device->cdev_id, irb->scsw.cmd.cc, irb->scsw.cmd.fctl); |
842d3fba | 1091 | request->status = TAPE_REQUEST_QUEUED; |
5f384338 | 1092 | schedule_delayed_work(&device->tape_dnr, HZ); |
4111796d SB |
1093 | return; |
1094 | } | |
1095 | ||
1da177e4 LT |
1096 | /* May be an unsolicited irq */ |
1097 | if(request != NULL) | |
23d805b6 PO |
1098 | request->rescnt = irb->scsw.cmd.count; |
1099 | else if ((irb->scsw.cmd.dstat == 0x85 || irb->scsw.cmd.dstat == 0x80) && | |
cced1dd4 MH |
1100 | !list_empty(&device->req_queue)) { |
1101 | /* Not Ready to Ready after long busy ? */ | |
1102 | struct tape_request *req; | |
1103 | req = list_entry(device->req_queue.next, | |
1104 | struct tape_request, list); | |
1105 | if (req->status == TAPE_REQUEST_LONG_BUSY) { | |
1106 | DBF_EVENT(3, "(%08x): del timer\n", device->cdev_id); | |
1107 | if (del_timer(&device->lb_timeout)) { | |
1108 | device->lb_timeout.data = (unsigned long) | |
1109 | tape_put_device(device); | |
1110 | __tape_start_next_request(device); | |
1111 | } | |
1112 | return; | |
1113 | } | |
1114 | } | |
23d805b6 | 1115 | if (irb->scsw.cmd.dstat != 0x0c) { |
1da177e4 LT |
1116 | /* Set the 'ONLINE' flag depending on sense byte 1 */ |
1117 | if(*(((__u8 *) irb->ecw) + 1) & SENSE_DRIVE_ONLINE) | |
1118 | device->tape_generic_status |= GMT_ONLINE(~0); | |
1119 | else | |
1120 | device->tape_generic_status &= ~GMT_ONLINE(~0); | |
1121 | ||
1122 | /* | |
1123 | * Any request that does not come back with channel end | |
1124 | * and device end is unusual. Log the sense data. | |
1125 | */ | |
1126 | DBF_EVENT(3,"-- Tape Interrupthandler --\n"); | |
1127 | tape_dump_sense_dbf(device, request, irb); | |
1128 | } else { | |
1129 | /* Upon normal completion the device _is_ online */ | |
1130 | device->tape_generic_status |= GMT_ONLINE(~0); | |
1131 | } | |
1132 | if (device->tape_state == TS_NOT_OPER) { | |
1133 | DBF_EVENT(6, "tape:device is not operational\n"); | |
1134 | return; | |
1135 | } | |
1136 | ||
1137 | /* | |
1138 | * Request that were canceled still come back with an interrupt. | |
1139 | * To detect these request the state will be set to TAPE_REQUEST_DONE. | |
1140 | */ | |
1141 | if(request != NULL && request->status == TAPE_REQUEST_DONE) { | |
4111796d | 1142 | __tape_end_request(device, request, -EIO); |
1da177e4 LT |
1143 | return; |
1144 | } | |
1145 | ||
1146 | rc = device->discipline->irq(device, request, irb); | |
1147 | /* | |
1148 | * rc < 0 : request finished unsuccessfully. | |
1149 | * rc == TAPE_IO_SUCCESS: request finished successfully. | |
1150 | * rc == TAPE_IO_PENDING: request is still running. Ignore rc. | |
1151 | * rc == TAPE_IO_RETRY: request finished but needs another go. | |
1152 | * rc == TAPE_IO_STOP: request needs to get terminated. | |
1153 | */ | |
1da177e4 | 1154 | switch (rc) { |
4111796d SB |
1155 | case TAPE_IO_SUCCESS: |
1156 | /* Upon normal completion the device _is_ online */ | |
1157 | device->tape_generic_status |= GMT_ONLINE(~0); | |
1158 | __tape_end_request(device, request, rc); | |
1159 | break; | |
1160 | case TAPE_IO_PENDING: | |
1161 | break; | |
cced1dd4 MH |
1162 | case TAPE_IO_LONG_BUSY: |
1163 | device->lb_timeout.data = | |
1164 | (unsigned long)tape_get_device_reference(device); | |
1165 | device->lb_timeout.expires = jiffies + | |
1166 | LONG_BUSY_TIMEOUT * HZ; | |
1167 | DBF_EVENT(3, "(%08x): add timer\n", device->cdev_id); | |
1168 | add_timer(&device->lb_timeout); | |
1169 | request->status = TAPE_REQUEST_LONG_BUSY; | |
1170 | break; | |
4111796d SB |
1171 | case TAPE_IO_RETRY: |
1172 | rc = __tape_start_io(device, request); | |
1173 | if (rc) | |
1174 | __tape_end_request(device, request, rc); | |
1175 | break; | |
1176 | case TAPE_IO_STOP: | |
1177 | rc = __tape_cancel_io(device, request); | |
1178 | if (rc) | |
1179 | __tape_end_request(device, request, rc); | |
1180 | break; | |
1181 | default: | |
1182 | if (rc > 0) { | |
1183 | DBF_EVENT(6, "xunknownrc\n"); | |
1184 | PRINT_ERR("Invalid return code from discipline " | |
1185 | "interrupt function.\n"); | |
1186 | __tape_end_request(device, request, -EIO); | |
1187 | } else { | |
1188 | __tape_end_request(device, request, rc); | |
1189 | } | |
1190 | break; | |
1da177e4 LT |
1191 | } |
1192 | } | |
1193 | ||
1194 | /* | |
1195 | * Tape device open function used by tape_char & tape_block frontends. | |
1196 | */ | |
1197 | int | |
1198 | tape_open(struct tape_device *device) | |
1199 | { | |
1200 | int rc; | |
1201 | ||
1202 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1203 | if (device->tape_state == TS_NOT_OPER) { | |
1204 | DBF_EVENT(6, "TAPE:nodev\n"); | |
1205 | rc = -ENODEV; | |
1206 | } else if (device->tape_state == TS_IN_USE) { | |
1207 | DBF_EVENT(6, "TAPE:dbusy\n"); | |
1208 | rc = -EBUSY; | |
1209 | } else if (device->tape_state == TS_BLKUSE) { | |
1210 | DBF_EVENT(6, "TAPE:dbusy\n"); | |
1211 | rc = -EBUSY; | |
1212 | } else if (device->discipline != NULL && | |
1213 | !try_module_get(device->discipline->owner)) { | |
1214 | DBF_EVENT(6, "TAPE:nodisc\n"); | |
1215 | rc = -ENODEV; | |
1216 | } else { | |
1217 | tape_state_set(device, TS_IN_USE); | |
1218 | rc = 0; | |
1219 | } | |
1220 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1221 | return rc; | |
1222 | } | |
1223 | ||
1224 | /* | |
1225 | * Tape device release function used by tape_char & tape_block frontends. | |
1226 | */ | |
1227 | int | |
1228 | tape_release(struct tape_device *device) | |
1229 | { | |
1230 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1231 | if (device->tape_state == TS_IN_USE) | |
1232 | tape_state_set(device, TS_UNUSED); | |
1233 | module_put(device->discipline->owner); | |
1234 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1235 | return 0; | |
1236 | } | |
1237 | ||
1238 | /* | |
1239 | * Execute a magnetic tape command a number of times. | |
1240 | */ | |
1241 | int | |
1242 | tape_mtop(struct tape_device *device, int mt_op, int mt_count) | |
1243 | { | |
1244 | tape_mtop_fn fn; | |
1245 | int rc; | |
1246 | ||
1247 | DBF_EVENT(6, "TAPE:mtio\n"); | |
1248 | DBF_EVENT(6, "TAPE:ioop: %x\n", mt_op); | |
1249 | DBF_EVENT(6, "TAPE:arg: %x\n", mt_count); | |
1250 | ||
1251 | if (mt_op < 0 || mt_op >= TAPE_NR_MTOPS) | |
1252 | return -EINVAL; | |
1253 | fn = device->discipline->mtop_array[mt_op]; | |
1254 | if (fn == NULL) | |
1255 | return -EINVAL; | |
1256 | ||
1257 | /* We assume that the backends can handle count up to 500. */ | |
1258 | if (mt_op == MTBSR || mt_op == MTFSR || mt_op == MTFSF || | |
1259 | mt_op == MTBSF || mt_op == MTFSFM || mt_op == MTBSFM) { | |
1260 | rc = 0; | |
1261 | for (; mt_count > 500; mt_count -= 500) | |
1262 | if ((rc = fn(device, 500)) != 0) | |
1263 | break; | |
1264 | if (rc == 0) | |
1265 | rc = fn(device, mt_count); | |
1266 | } else | |
1267 | rc = fn(device, mt_count); | |
1268 | return rc; | |
1269 | ||
1270 | } | |
1271 | ||
1272 | /* | |
1273 | * Tape init function. | |
1274 | */ | |
1275 | static int | |
1276 | tape_init (void) | |
1277 | { | |
66a464db | 1278 | TAPE_DBF_AREA = debug_register ( "tape", 2, 2, 4*sizeof(long)); |
1da177e4 LT |
1279 | debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view); |
1280 | #ifdef DBF_LIKE_HELL | |
1281 | debug_set_level(TAPE_DBF_AREA, 6); | |
1282 | #endif | |
e018ba1f | 1283 | DBF_EVENT(3, "tape init\n"); |
1da177e4 LT |
1284 | tape_proc_init(); |
1285 | tapechar_init (); | |
1286 | tapeblock_init (); | |
1287 | return 0; | |
1288 | } | |
1289 | ||
1290 | /* | |
1291 | * Tape exit function. | |
1292 | */ | |
1293 | static void | |
1294 | tape_exit(void) | |
1295 | { | |
1296 | DBF_EVENT(6, "tape exit\n"); | |
1297 | ||
1298 | /* Get rid of the frontends */ | |
1299 | tapechar_exit(); | |
1300 | tapeblock_exit(); | |
1301 | tape_proc_cleanup(); | |
1302 | debug_unregister (TAPE_DBF_AREA); | |
1303 | } | |
1304 | ||
1305 | MODULE_AUTHOR("(C) 2001 IBM Deutschland Entwicklung GmbH by Carsten Otte and " | |
1306 | "Michael Holzheu (cotte@de.ibm.com,holzheu@de.ibm.com)"); | |
e018ba1f | 1307 | MODULE_DESCRIPTION("Linux on zSeries channel attached tape device driver"); |
1da177e4 LT |
1308 | MODULE_LICENSE("GPL"); |
1309 | ||
1310 | module_init(tape_init); | |
1311 | module_exit(tape_exit); | |
1312 | ||
1313 | EXPORT_SYMBOL(tape_generic_remove); | |
1314 | EXPORT_SYMBOL(tape_generic_probe); | |
1315 | EXPORT_SYMBOL(tape_generic_online); | |
1316 | EXPORT_SYMBOL(tape_generic_offline); | |
1317 | EXPORT_SYMBOL(tape_put_device); | |
1318 | EXPORT_SYMBOL(tape_get_device_reference); | |
1319 | EXPORT_SYMBOL(tape_state_verbose); | |
1320 | EXPORT_SYMBOL(tape_op_verbose); | |
1321 | EXPORT_SYMBOL(tape_state_set); | |
1322 | EXPORT_SYMBOL(tape_med_state_set); | |
1323 | EXPORT_SYMBOL(tape_alloc_request); | |
1324 | EXPORT_SYMBOL(tape_free_request); | |
1325 | EXPORT_SYMBOL(tape_dump_sense); | |
1326 | EXPORT_SYMBOL(tape_dump_sense_dbf); | |
1327 | EXPORT_SYMBOL(tape_do_io); | |
1328 | EXPORT_SYMBOL(tape_do_io_async); | |
1329 | EXPORT_SYMBOL(tape_do_io_interruptible); | |
5f384338 | 1330 | EXPORT_SYMBOL(tape_cancel_io); |
1da177e4 | 1331 | EXPORT_SYMBOL(tape_mtop); |