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", | |
2a0217d5 | 218 | dev_name(&device->cdev->dev)); |
1da177e4 LT |
219 | break; |
220 | case MS_LOADED: | |
221 | device->tape_generic_status &= ~GMT_DR_OPEN(~0); | |
222 | PRINT_INFO("(%s): Tape has been mounted\n", | |
2a0217d5 | 223 | dev_name(&device->cdev->dev)); |
1da177e4 LT |
224 | break; |
225 | default: | |
226 | // print nothing | |
227 | break; | |
228 | } | |
229 | device->medium_state = newstate; | |
230 | wake_up(&device->state_change_wq); | |
231 | } | |
232 | ||
233 | /* | |
234 | * Stop running ccw. Has to be called with the device lock held. | |
235 | */ | |
4d284cac | 236 | static int |
4111796d | 237 | __tape_cancel_io(struct tape_device *device, struct tape_request *request) |
1da177e4 LT |
238 | { |
239 | int retries; | |
240 | int rc; | |
241 | ||
242 | /* Check if interrupt has already been processed */ | |
243 | if (request->callback == NULL) | |
244 | return 0; | |
245 | ||
246 | rc = 0; | |
247 | for (retries = 0; retries < 5; retries++) { | |
248 | rc = ccw_device_clear(device->cdev, (long) request); | |
249 | ||
4111796d SB |
250 | switch (rc) { |
251 | case 0: | |
252 | request->status = TAPE_REQUEST_DONE; | |
253 | return 0; | |
254 | case -EBUSY: | |
255 | request->status = TAPE_REQUEST_CANCEL; | |
c1637532 | 256 | schedule_delayed_work(&device->tape_dnr, 0); |
4111796d SB |
257 | return 0; |
258 | case -ENODEV: | |
259 | DBF_EXCEPTION(2, "device gone, retry\n"); | |
260 | break; | |
261 | case -EIO: | |
262 | DBF_EXCEPTION(2, "I/O error, retry\n"); | |
263 | break; | |
264 | default: | |
265 | BUG(); | |
1da177e4 | 266 | } |
1da177e4 LT |
267 | } |
268 | ||
269 | return rc; | |
270 | } | |
271 | ||
272 | /* | |
273 | * Add device into the sorted list, giving it the first | |
274 | * available minor number. | |
275 | */ | |
276 | static int | |
277 | tape_assign_minor(struct tape_device *device) | |
278 | { | |
279 | struct tape_device *tmp; | |
280 | int minor; | |
281 | ||
282 | minor = 0; | |
283 | write_lock(&tape_device_lock); | |
284 | list_for_each_entry(tmp, &tape_device_list, node) { | |
285 | if (minor < tmp->first_minor) | |
286 | break; | |
287 | minor += TAPE_MINORS_PER_DEV; | |
288 | } | |
289 | if (minor >= 256) { | |
290 | write_unlock(&tape_device_lock); | |
291 | return -ENODEV; | |
292 | } | |
293 | device->first_minor = minor; | |
294 | list_add_tail(&device->node, &tmp->node); | |
295 | write_unlock(&tape_device_lock); | |
296 | return 0; | |
297 | } | |
298 | ||
299 | /* remove device from the list */ | |
300 | static void | |
301 | tape_remove_minor(struct tape_device *device) | |
302 | { | |
303 | write_lock(&tape_device_lock); | |
304 | list_del_init(&device->node); | |
305 | device->first_minor = -1; | |
306 | write_unlock(&tape_device_lock); | |
307 | } | |
308 | ||
309 | /* | |
310 | * Set a device online. | |
311 | * | |
312 | * This function is called by the common I/O layer to move a device from the | |
313 | * detected but offline into the online state. | |
314 | * If we return an error (RC < 0) the device remains in the offline state. This | |
315 | * can happen if the device is assigned somewhere else, for example. | |
316 | */ | |
317 | int | |
318 | tape_generic_online(struct tape_device *device, | |
319 | struct tape_discipline *discipline) | |
320 | { | |
321 | int rc; | |
322 | ||
323 | DBF_LH(6, "tape_enable_device(%p, %p)\n", device, discipline); | |
324 | ||
325 | if (device->tape_state != TS_INIT) { | |
326 | DBF_LH(3, "Tapestate not INIT (%d)\n", device->tape_state); | |
327 | return -EINVAL; | |
328 | } | |
329 | ||
cced1dd4 MH |
330 | init_timer(&device->lb_timeout); |
331 | device->lb_timeout.function = tape_long_busy_timeout; | |
332 | ||
1da177e4 LT |
333 | /* Let the discipline have a go at the device. */ |
334 | device->discipline = discipline; | |
335 | if (!try_module_get(discipline->owner)) { | |
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", | |
2a0217d5 | 418 | dev_name(&device->cdev->dev)); |
1da177e4 LT |
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); | |
2a0217d5 KS |
541 | PRINT_ERR("probe failed for tape device %s\n", |
542 | dev_name(&cdev->dev)); | |
d7cf0d57 HC |
543 | return ret; |
544 | } | |
1da177e4 | 545 | cdev->dev.driver_data = device; |
d7cf0d57 | 546 | cdev->handler = __tape_do_irq; |
1da177e4 | 547 | device->cdev = cdev; |
f455adcf CH |
548 | ccw_device_get_id(cdev, &dev_id); |
549 | device->cdev_id = devid_to_int(&dev_id); | |
2a0217d5 | 550 | PRINT_INFO("tape device %s found\n", dev_name(&cdev->dev)); |
d7cf0d57 | 551 | return ret; |
1da177e4 LT |
552 | } |
553 | ||
4d284cac | 554 | static void |
1da177e4 LT |
555 | __tape_discard_requests(struct tape_device *device) |
556 | { | |
557 | struct tape_request * request; | |
558 | struct list_head * l, *n; | |
559 | ||
560 | list_for_each_safe(l, n, &device->req_queue) { | |
561 | request = list_entry(l, struct tape_request, list); | |
562 | if (request->status == TAPE_REQUEST_IN_IO) | |
563 | request->status = TAPE_REQUEST_DONE; | |
564 | list_del(&request->list); | |
565 | ||
566 | /* Decrease ref_count for removed request. */ | |
567 | request->device = tape_put_device(device); | |
568 | request->rc = -EIO; | |
569 | if (request->callback != NULL) | |
570 | request->callback(request, request->callback_data); | |
571 | } | |
572 | } | |
573 | ||
574 | /* | |
575 | * Driverfs tape remove function. | |
576 | * | |
577 | * This function is called whenever the common I/O layer detects the device | |
578 | * gone. This can happen at any time and we cannot refuse. | |
579 | */ | |
580 | void | |
581 | tape_generic_remove(struct ccw_device *cdev) | |
582 | { | |
583 | struct tape_device * device; | |
584 | ||
585 | device = cdev->dev.driver_data; | |
586 | if (!device) { | |
587 | PRINT_ERR("No device pointer in tape_generic_remove!\n"); | |
588 | return; | |
589 | } | |
590 | DBF_LH(3, "(%08x): tape_generic_remove(%p)\n", device->cdev_id, cdev); | |
591 | ||
592 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
593 | switch (device->tape_state) { | |
594 | case TS_INIT: | |
595 | tape_state_set(device, TS_NOT_OPER); | |
596 | case TS_NOT_OPER: | |
597 | /* | |
598 | * Nothing to do. | |
599 | */ | |
600 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
601 | break; | |
602 | case TS_UNUSED: | |
603 | /* | |
604 | * Need only to release the device. | |
605 | */ | |
606 | tape_state_set(device, TS_NOT_OPER); | |
607 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
608 | tape_cleanup_device(device); | |
609 | break; | |
610 | default: | |
611 | /* | |
612 | * There may be requests on the queue. We will not get | |
613 | * an interrupt for a request that was running. So we | |
614 | * just post them all as I/O errors. | |
615 | */ | |
616 | DBF_EVENT(3, "(%08x): Drive in use vanished!\n", | |
617 | device->cdev_id); | |
618 | PRINT_WARN("(%s): Drive in use vanished - " | |
619 | "expect trouble!\n", | |
2a0217d5 | 620 | dev_name(&device->cdev->dev)); |
1da177e4 LT |
621 | PRINT_WARN("State was %i\n", device->tape_state); |
622 | tape_state_set(device, TS_NOT_OPER); | |
623 | __tape_discard_requests(device); | |
624 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
625 | tape_cleanup_device(device); | |
626 | } | |
627 | ||
628 | if (cdev->dev.driver_data != NULL) { | |
629 | sysfs_remove_group(&cdev->dev.kobj, &tape_attr_group); | |
630 | cdev->dev.driver_data = tape_put_device(cdev->dev.driver_data); | |
631 | } | |
632 | } | |
633 | ||
634 | /* | |
635 | * Allocate a new tape ccw request | |
636 | */ | |
637 | struct tape_request * | |
638 | tape_alloc_request(int cplength, int datasize) | |
639 | { | |
640 | struct tape_request *request; | |
641 | ||
642 | if (datasize > PAGE_SIZE || (cplength*sizeof(struct ccw1)) > PAGE_SIZE) | |
643 | BUG(); | |
644 | ||
645 | DBF_LH(6, "tape_alloc_request(%d, %d)\n", cplength, datasize); | |
646 | ||
88abaab4 | 647 | request = kzalloc(sizeof(struct tape_request), GFP_KERNEL); |
1da177e4 LT |
648 | if (request == NULL) { |
649 | DBF_EXCEPTION(1, "cqra nomem\n"); | |
650 | return ERR_PTR(-ENOMEM); | |
651 | } | |
1da177e4 LT |
652 | /* allocate channel program */ |
653 | if (cplength > 0) { | |
88abaab4 | 654 | request->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
655 | GFP_ATOMIC | GFP_DMA); |
656 | if (request->cpaddr == NULL) { | |
657 | DBF_EXCEPTION(1, "cqra nomem\n"); | |
658 | kfree(request); | |
659 | return ERR_PTR(-ENOMEM); | |
660 | } | |
1da177e4 LT |
661 | } |
662 | /* alloc small kernel buffer */ | |
663 | if (datasize > 0) { | |
88abaab4 | 664 | request->cpdata = kzalloc(datasize, GFP_KERNEL | GFP_DMA); |
1da177e4 LT |
665 | if (request->cpdata == NULL) { |
666 | DBF_EXCEPTION(1, "cqra nomem\n"); | |
17fd682e | 667 | kfree(request->cpaddr); |
1da177e4 LT |
668 | kfree(request); |
669 | return ERR_PTR(-ENOMEM); | |
670 | } | |
1da177e4 LT |
671 | } |
672 | DBF_LH(6, "New request %p(%p/%p)\n", request, request->cpaddr, | |
673 | request->cpdata); | |
674 | ||
675 | return request; | |
676 | } | |
677 | ||
678 | /* | |
679 | * Free tape ccw request | |
680 | */ | |
681 | void | |
682 | tape_free_request (struct tape_request * request) | |
683 | { | |
684 | DBF_LH(6, "Free request %p\n", request); | |
685 | ||
686 | if (request->device != NULL) { | |
687 | request->device = tape_put_device(request->device); | |
688 | } | |
17fd682e JJ |
689 | kfree(request->cpdata); |
690 | kfree(request->cpaddr); | |
1da177e4 LT |
691 | kfree(request); |
692 | } | |
693 | ||
4d284cac | 694 | static int |
4111796d SB |
695 | __tape_start_io(struct tape_device *device, struct tape_request *request) |
696 | { | |
697 | int rc; | |
698 | ||
699 | #ifdef CONFIG_S390_TAPE_BLOCK | |
700 | if (request->op == TO_BLOCK) | |
701 | device->discipline->check_locate(device, request); | |
702 | #endif | |
703 | rc = ccw_device_start( | |
704 | device->cdev, | |
705 | request->cpaddr, | |
706 | (unsigned long) request, | |
707 | 0x00, | |
708 | request->options | |
709 | ); | |
710 | if (rc == 0) { | |
711 | request->status = TAPE_REQUEST_IN_IO; | |
712 | } else if (rc == -EBUSY) { | |
713 | /* The common I/O subsystem is currently busy. Retry later. */ | |
714 | request->status = TAPE_REQUEST_QUEUED; | |
c1637532 | 715 | schedule_delayed_work(&device->tape_dnr, 0); |
4111796d SB |
716 | rc = 0; |
717 | } else { | |
718 | /* Start failed. Remove request and indicate failure. */ | |
719 | DBF_EVENT(1, "tape: start request failed with RC = %i\n", rc); | |
720 | } | |
721 | return rc; | |
722 | } | |
723 | ||
4d284cac | 724 | static void |
4111796d | 725 | __tape_start_next_request(struct tape_device *device) |
1da177e4 LT |
726 | { |
727 | struct list_head *l, *n; | |
728 | struct tape_request *request; | |
729 | int rc; | |
730 | ||
4111796d | 731 | DBF_LH(6, "__tape_start_next_request(%p)\n", device); |
1da177e4 LT |
732 | /* |
733 | * Try to start each request on request queue until one is | |
734 | * started successful. | |
735 | */ | |
736 | list_for_each_safe(l, n, &device->req_queue) { | |
737 | request = list_entry(l, struct tape_request, list); | |
4111796d SB |
738 | |
739 | /* | |
740 | * Avoid race condition if bottom-half was triggered more than | |
741 | * once. | |
742 | */ | |
743 | if (request->status == TAPE_REQUEST_IN_IO) | |
744 | return; | |
5f384338 MH |
745 | /* |
746 | * Request has already been stopped. We have to wait until | |
747 | * the request is removed from the queue in the interrupt | |
748 | * handling. | |
749 | */ | |
750 | if (request->status == TAPE_REQUEST_DONE) | |
751 | return; | |
4111796d SB |
752 | |
753 | /* | |
754 | * We wanted to cancel the request but the common I/O layer | |
755 | * was busy at that time. This can only happen if this | |
756 | * function is called by delayed_next_request. | |
757 | * Otherwise we start the next request on the queue. | |
758 | */ | |
759 | if (request->status == TAPE_REQUEST_CANCEL) { | |
760 | rc = __tape_cancel_io(device, request); | |
761 | } else { | |
762 | rc = __tape_start_io(device, request); | |
1da177e4 | 763 | } |
4111796d SB |
764 | if (rc == 0) |
765 | return; | |
1da177e4 | 766 | |
4111796d | 767 | /* Set ending status. */ |
1da177e4 LT |
768 | request->rc = rc; |
769 | request->status = TAPE_REQUEST_DONE; | |
4111796d SB |
770 | |
771 | /* Remove from request queue. */ | |
772 | list_del(&request->list); | |
773 | ||
774 | /* Do callback. */ | |
775 | if (request->callback != NULL) | |
776 | request->callback(request, request->callback_data); | |
1da177e4 LT |
777 | } |
778 | } | |
779 | ||
780 | static void | |
c1637532 | 781 | tape_delayed_next_request(struct work_struct *work) |
1da177e4 | 782 | { |
c1637532 MS |
783 | struct tape_device *device = |
784 | container_of(work, struct tape_device, tape_dnr.work); | |
1da177e4 | 785 | |
4111796d SB |
786 | DBF_LH(6, "tape_delayed_next_request(%p)\n", device); |
787 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
788 | __tape_start_next_request(device); | |
789 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
790 | } | |
791 | ||
cced1dd4 MH |
792 | static void tape_long_busy_timeout(unsigned long data) |
793 | { | |
794 | struct tape_request *request; | |
795 | struct tape_device *device; | |
796 | ||
797 | device = (struct tape_device *) data; | |
798 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
799 | request = list_entry(device->req_queue.next, struct tape_request, list); | |
800 | if (request->status != TAPE_REQUEST_LONG_BUSY) | |
801 | BUG(); | |
802 | DBF_LH(6, "%08x: Long busy timeout.\n", device->cdev_id); | |
803 | __tape_start_next_request(device); | |
804 | device->lb_timeout.data = (unsigned long) tape_put_device(device); | |
805 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
806 | } | |
807 | ||
4d284cac | 808 | static void |
4111796d SB |
809 | __tape_end_request( |
810 | struct tape_device * device, | |
811 | struct tape_request * request, | |
812 | int rc) | |
813 | { | |
814 | DBF_LH(6, "__tape_end_request(%p, %p, %i)\n", device, request, rc); | |
815 | if (request) { | |
816 | request->rc = rc; | |
817 | request->status = TAPE_REQUEST_DONE; | |
818 | ||
819 | /* Remove from request queue. */ | |
820 | list_del(&request->list); | |
821 | ||
822 | /* Do callback. */ | |
823 | if (request->callback != NULL) | |
824 | request->callback(request, request->callback_data); | |
825 | } | |
1da177e4 LT |
826 | |
827 | /* Start next request. */ | |
828 | if (!list_empty(&device->req_queue)) | |
4111796d | 829 | __tape_start_next_request(device); |
1da177e4 LT |
830 | } |
831 | ||
832 | /* | |
833 | * Write sense data to console/dbf | |
834 | */ | |
835 | void | |
836 | tape_dump_sense(struct tape_device* device, struct tape_request *request, | |
837 | struct irb *irb) | |
838 | { | |
839 | unsigned int *sptr; | |
840 | ||
841 | PRINT_INFO("-------------------------------------------------\n"); | |
842 | PRINT_INFO("DSTAT : %02x CSTAT: %02x CPA: %04x\n", | |
23d805b6 | 843 | irb->scsw.cmd.dstat, irb->scsw.cmd.cstat, irb->scsw.cmd.cpa); |
2a0217d5 | 844 | PRINT_INFO("DEVICE: %s\n", dev_name(&device->cdev->dev)); |
1da177e4 LT |
845 | if (request != NULL) |
846 | PRINT_INFO("OP : %s\n", tape_op_verbose[request->op]); | |
847 | ||
848 | sptr = (unsigned int *) irb->ecw; | |
849 | PRINT_INFO("Sense data: %08X %08X %08X %08X \n", | |
850 | sptr[0], sptr[1], sptr[2], sptr[3]); | |
851 | PRINT_INFO("Sense data: %08X %08X %08X %08X \n", | |
852 | sptr[4], sptr[5], sptr[6], sptr[7]); | |
853 | PRINT_INFO("--------------------------------------------------\n"); | |
854 | } | |
855 | ||
856 | /* | |
857 | * Write sense data to dbf | |
858 | */ | |
859 | void | |
860 | tape_dump_sense_dbf(struct tape_device *device, struct tape_request *request, | |
861 | struct irb *irb) | |
862 | { | |
863 | unsigned int *sptr; | |
864 | const char* op; | |
865 | ||
866 | if (request != NULL) | |
867 | op = tape_op_verbose[request->op]; | |
868 | else | |
869 | op = "---"; | |
870 | DBF_EVENT(3, "DSTAT : %02x CSTAT: %02x\n", | |
23d805b6 | 871 | irb->scsw.cmd.dstat, irb->scsw.cmd.cstat); |
1da177e4 LT |
872 | DBF_EVENT(3, "DEVICE: %08x OP\t: %s\n", device->cdev_id, op); |
873 | sptr = (unsigned int *) irb->ecw; | |
874 | DBF_EVENT(3, "%08x %08x\n", sptr[0], sptr[1]); | |
875 | DBF_EVENT(3, "%08x %08x\n", sptr[2], sptr[3]); | |
876 | DBF_EVENT(3, "%08x %08x\n", sptr[4], sptr[5]); | |
877 | DBF_EVENT(3, "%08x %08x\n", sptr[6], sptr[7]); | |
878 | } | |
879 | ||
880 | /* | |
881 | * I/O helper function. Adds the request to the request queue | |
882 | * and starts it if the tape is idle. Has to be called with | |
883 | * the device lock held. | |
884 | */ | |
4d284cac | 885 | static int |
4111796d | 886 | __tape_start_request(struct tape_device *device, struct tape_request *request) |
1da177e4 LT |
887 | { |
888 | int rc; | |
889 | ||
890 | switch (request->op) { | |
891 | case TO_MSEN: | |
892 | case TO_ASSIGN: | |
893 | case TO_UNASSIGN: | |
894 | case TO_READ_ATTMSG: | |
e2963062 | 895 | case TO_RDC: |
1da177e4 LT |
896 | if (device->tape_state == TS_INIT) |
897 | break; | |
898 | if (device->tape_state == TS_UNUSED) | |
899 | break; | |
900 | default: | |
901 | if (device->tape_state == TS_BLKUSE) | |
902 | break; | |
903 | if (device->tape_state != TS_IN_USE) | |
904 | return -ENODEV; | |
905 | } | |
906 | ||
907 | /* Increase use count of device for the added request. */ | |
908 | request->device = tape_get_device_reference(device); | |
909 | ||
910 | if (list_empty(&device->req_queue)) { | |
911 | /* No other requests are on the queue. Start this one. */ | |
4111796d SB |
912 | rc = __tape_start_io(device, request); |
913 | if (rc) | |
1da177e4 | 914 | return rc; |
4111796d | 915 | |
1da177e4 LT |
916 | DBF_LH(5, "Request %p added for execution.\n", request); |
917 | list_add(&request->list, &device->req_queue); | |
1da177e4 LT |
918 | } else { |
919 | DBF_LH(5, "Request %p add to queue.\n", request); | |
1da177e4 | 920 | request->status = TAPE_REQUEST_QUEUED; |
4111796d | 921 | list_add_tail(&request->list, &device->req_queue); |
1da177e4 LT |
922 | } |
923 | return 0; | |
924 | } | |
925 | ||
926 | /* | |
927 | * Add the request to the request queue, try to start it if the | |
928 | * tape is idle. Return without waiting for end of i/o. | |
929 | */ | |
930 | int | |
931 | tape_do_io_async(struct tape_device *device, struct tape_request *request) | |
932 | { | |
933 | int rc; | |
934 | ||
935 | DBF_LH(6, "tape_do_io_async(%p, %p)\n", device, request); | |
936 | ||
937 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
938 | /* Add request to request queue and try to start it. */ | |
4111796d | 939 | rc = __tape_start_request(device, request); |
1da177e4 LT |
940 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
941 | return rc; | |
942 | } | |
943 | ||
944 | /* | |
945 | * tape_do_io/__tape_wake_up | |
946 | * Add the request to the request queue, try to start it if the | |
947 | * tape is idle and wait uninterruptible for its completion. | |
948 | */ | |
949 | static void | |
950 | __tape_wake_up(struct tape_request *request, void *data) | |
951 | { | |
952 | request->callback = NULL; | |
953 | wake_up((wait_queue_head_t *) data); | |
954 | } | |
955 | ||
956 | int | |
957 | tape_do_io(struct tape_device *device, struct tape_request *request) | |
958 | { | |
1da177e4 LT |
959 | int rc; |
960 | ||
1da177e4 LT |
961 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
962 | /* Setup callback */ | |
963 | request->callback = __tape_wake_up; | |
4657fb8a | 964 | request->callback_data = &device->wait_queue; |
1da177e4 | 965 | /* Add request to request queue and try to start it. */ |
4111796d | 966 | rc = __tape_start_request(device, request); |
1da177e4 LT |
967 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
968 | if (rc) | |
969 | return rc; | |
970 | /* Request added to the queue. Wait for its completion. */ | |
4657fb8a | 971 | wait_event(device->wait_queue, (request->callback == NULL)); |
1da177e4 LT |
972 | /* Get rc from request */ |
973 | return request->rc; | |
974 | } | |
975 | ||
976 | /* | |
977 | * tape_do_io_interruptible/__tape_wake_up_interruptible | |
978 | * Add the request to the request queue, try to start it if the | |
979 | * tape is idle and wait uninterruptible for its completion. | |
980 | */ | |
981 | static void | |
982 | __tape_wake_up_interruptible(struct tape_request *request, void *data) | |
983 | { | |
984 | request->callback = NULL; | |
985 | wake_up_interruptible((wait_queue_head_t *) data); | |
986 | } | |
987 | ||
988 | int | |
989 | tape_do_io_interruptible(struct tape_device *device, | |
990 | struct tape_request *request) | |
991 | { | |
1da177e4 LT |
992 | int rc; |
993 | ||
1da177e4 LT |
994 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
995 | /* Setup callback */ | |
996 | request->callback = __tape_wake_up_interruptible; | |
4657fb8a | 997 | request->callback_data = &device->wait_queue; |
4111796d | 998 | rc = __tape_start_request(device, request); |
1da177e4 LT |
999 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1000 | if (rc) | |
1001 | return rc; | |
1002 | /* Request added to the queue. Wait for its completion. */ | |
4657fb8a MS |
1003 | rc = wait_event_interruptible(device->wait_queue, |
1004 | (request->callback == NULL)); | |
1da177e4 LT |
1005 | if (rc != -ERESTARTSYS) |
1006 | /* Request finished normally. */ | |
1007 | return request->rc; | |
4111796d | 1008 | |
1da177e4 LT |
1009 | /* Interrupted by a signal. We have to stop the current request. */ |
1010 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
4111796d SB |
1011 | rc = __tape_cancel_io(device, request); |
1012 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 | 1013 | if (rc == 0) { |
4111796d SB |
1014 | /* Wait for the interrupt that acknowledges the halt. */ |
1015 | do { | |
1016 | rc = wait_event_interruptible( | |
4657fb8a | 1017 | device->wait_queue, |
4111796d SB |
1018 | (request->callback == NULL) |
1019 | ); | |
4cd190a7 | 1020 | } while (rc == -ERESTARTSYS); |
4111796d | 1021 | |
1da177e4 LT |
1022 | DBF_EVENT(3, "IO stopped on %08x\n", device->cdev_id); |
1023 | rc = -ERESTARTSYS; | |
1024 | } | |
1da177e4 LT |
1025 | return rc; |
1026 | } | |
1027 | ||
5f384338 MH |
1028 | /* |
1029 | * Stop running ccw. | |
1030 | */ | |
1031 | int | |
1032 | tape_cancel_io(struct tape_device *device, struct tape_request *request) | |
1033 | { | |
1034 | int rc; | |
1035 | ||
1036 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1037 | rc = __tape_cancel_io(device, request); | |
1038 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1039 | return rc; | |
1040 | } | |
1041 | ||
1da177e4 LT |
1042 | /* |
1043 | * Tape interrupt routine, called from the ccw_device layer | |
1044 | */ | |
1045 | static void | |
1046 | __tape_do_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb) | |
1047 | { | |
1048 | struct tape_device *device; | |
1049 | struct tape_request *request; | |
1da177e4 LT |
1050 | int rc; |
1051 | ||
1052 | device = (struct tape_device *) cdev->dev.driver_data; | |
1053 | if (device == NULL) { | |
1054 | PRINT_ERR("could not get device structure for %s " | |
2a0217d5 | 1055 | "in interrupt\n", dev_name(&cdev->dev)); |
1da177e4 LT |
1056 | return; |
1057 | } | |
1058 | request = (struct tape_request *) intparm; | |
1059 | ||
1060 | DBF_LH(6, "__tape_do_irq(device=%p, request=%p)\n", device, request); | |
1061 | ||
1062 | /* On special conditions irb is an error pointer */ | |
1063 | if (IS_ERR(irb)) { | |
4111796d | 1064 | /* FIXME: What to do with the request? */ |
1da177e4 LT |
1065 | switch (PTR_ERR(irb)) { |
1066 | case -ETIMEDOUT: | |
1067 | PRINT_WARN("(%s): Request timed out\n", | |
2a0217d5 | 1068 | dev_name(&cdev->dev)); |
1da177e4 | 1069 | case -EIO: |
4111796d | 1070 | __tape_end_request(device, request, -EIO); |
1da177e4 LT |
1071 | break; |
1072 | default: | |
1073 | PRINT_ERR("(%s): Unexpected i/o error %li\n", | |
2a0217d5 | 1074 | dev_name(&cdev->dev), |
1da177e4 LT |
1075 | PTR_ERR(irb)); |
1076 | } | |
1077 | return; | |
1078 | } | |
1079 | ||
4111796d SB |
1080 | /* |
1081 | * If the condition code is not zero and the start function bit is | |
1082 | * still set, this is an deferred error and the last start I/O did | |
842d3fba SB |
1083 | * not succeed. At this point the condition that caused the deferred |
1084 | * error might still apply. So we just schedule the request to be | |
1085 | * started later. | |
4111796d | 1086 | */ |
23d805b6 PO |
1087 | if (irb->scsw.cmd.cc != 0 && |
1088 | (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) && | |
5f384338 MH |
1089 | (request->status == TAPE_REQUEST_IN_IO)) { |
1090 | DBF_EVENT(3,"(%08x): deferred cc=%i, fctl=%i. restarting\n", | |
23d805b6 | 1091 | device->cdev_id, irb->scsw.cmd.cc, irb->scsw.cmd.fctl); |
842d3fba | 1092 | request->status = TAPE_REQUEST_QUEUED; |
5f384338 | 1093 | schedule_delayed_work(&device->tape_dnr, HZ); |
4111796d SB |
1094 | return; |
1095 | } | |
1096 | ||
1da177e4 LT |
1097 | /* May be an unsolicited irq */ |
1098 | if(request != NULL) | |
23d805b6 PO |
1099 | request->rescnt = irb->scsw.cmd.count; |
1100 | else if ((irb->scsw.cmd.dstat == 0x85 || irb->scsw.cmd.dstat == 0x80) && | |
cced1dd4 MH |
1101 | !list_empty(&device->req_queue)) { |
1102 | /* Not Ready to Ready after long busy ? */ | |
1103 | struct tape_request *req; | |
1104 | req = list_entry(device->req_queue.next, | |
1105 | struct tape_request, list); | |
1106 | if (req->status == TAPE_REQUEST_LONG_BUSY) { | |
1107 | DBF_EVENT(3, "(%08x): del timer\n", device->cdev_id); | |
1108 | if (del_timer(&device->lb_timeout)) { | |
1109 | device->lb_timeout.data = (unsigned long) | |
1110 | tape_put_device(device); | |
1111 | __tape_start_next_request(device); | |
1112 | } | |
1113 | return; | |
1114 | } | |
1115 | } | |
23d805b6 | 1116 | if (irb->scsw.cmd.dstat != 0x0c) { |
1da177e4 LT |
1117 | /* Set the 'ONLINE' flag depending on sense byte 1 */ |
1118 | if(*(((__u8 *) irb->ecw) + 1) & SENSE_DRIVE_ONLINE) | |
1119 | device->tape_generic_status |= GMT_ONLINE(~0); | |
1120 | else | |
1121 | device->tape_generic_status &= ~GMT_ONLINE(~0); | |
1122 | ||
1123 | /* | |
1124 | * Any request that does not come back with channel end | |
1125 | * and device end is unusual. Log the sense data. | |
1126 | */ | |
1127 | DBF_EVENT(3,"-- Tape Interrupthandler --\n"); | |
1128 | tape_dump_sense_dbf(device, request, irb); | |
1129 | } else { | |
1130 | /* Upon normal completion the device _is_ online */ | |
1131 | device->tape_generic_status |= GMT_ONLINE(~0); | |
1132 | } | |
1133 | if (device->tape_state == TS_NOT_OPER) { | |
1134 | DBF_EVENT(6, "tape:device is not operational\n"); | |
1135 | return; | |
1136 | } | |
1137 | ||
1138 | /* | |
1139 | * Request that were canceled still come back with an interrupt. | |
1140 | * To detect these request the state will be set to TAPE_REQUEST_DONE. | |
1141 | */ | |
1142 | if(request != NULL && request->status == TAPE_REQUEST_DONE) { | |
4111796d | 1143 | __tape_end_request(device, request, -EIO); |
1da177e4 LT |
1144 | return; |
1145 | } | |
1146 | ||
1147 | rc = device->discipline->irq(device, request, irb); | |
1148 | /* | |
1149 | * rc < 0 : request finished unsuccessfully. | |
1150 | * rc == TAPE_IO_SUCCESS: request finished successfully. | |
1151 | * rc == TAPE_IO_PENDING: request is still running. Ignore rc. | |
1152 | * rc == TAPE_IO_RETRY: request finished but needs another go. | |
1153 | * rc == TAPE_IO_STOP: request needs to get terminated. | |
1154 | */ | |
1da177e4 | 1155 | switch (rc) { |
4111796d SB |
1156 | case TAPE_IO_SUCCESS: |
1157 | /* Upon normal completion the device _is_ online */ | |
1158 | device->tape_generic_status |= GMT_ONLINE(~0); | |
1159 | __tape_end_request(device, request, rc); | |
1160 | break; | |
1161 | case TAPE_IO_PENDING: | |
1162 | break; | |
cced1dd4 MH |
1163 | case TAPE_IO_LONG_BUSY: |
1164 | device->lb_timeout.data = | |
1165 | (unsigned long)tape_get_device_reference(device); | |
1166 | device->lb_timeout.expires = jiffies + | |
1167 | LONG_BUSY_TIMEOUT * HZ; | |
1168 | DBF_EVENT(3, "(%08x): add timer\n", device->cdev_id); | |
1169 | add_timer(&device->lb_timeout); | |
1170 | request->status = TAPE_REQUEST_LONG_BUSY; | |
1171 | break; | |
4111796d SB |
1172 | case TAPE_IO_RETRY: |
1173 | rc = __tape_start_io(device, request); | |
1174 | if (rc) | |
1175 | __tape_end_request(device, request, rc); | |
1176 | break; | |
1177 | case TAPE_IO_STOP: | |
1178 | rc = __tape_cancel_io(device, request); | |
1179 | if (rc) | |
1180 | __tape_end_request(device, request, rc); | |
1181 | break; | |
1182 | default: | |
1183 | if (rc > 0) { | |
1184 | DBF_EVENT(6, "xunknownrc\n"); | |
1185 | PRINT_ERR("Invalid return code from discipline " | |
1186 | "interrupt function.\n"); | |
1187 | __tape_end_request(device, request, -EIO); | |
1188 | } else { | |
1189 | __tape_end_request(device, request, rc); | |
1190 | } | |
1191 | break; | |
1da177e4 LT |
1192 | } |
1193 | } | |
1194 | ||
1195 | /* | |
1196 | * Tape device open function used by tape_char & tape_block frontends. | |
1197 | */ | |
1198 | int | |
1199 | tape_open(struct tape_device *device) | |
1200 | { | |
1201 | int rc; | |
1202 | ||
b3c21e49 | 1203 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1da177e4 LT |
1204 | if (device->tape_state == TS_NOT_OPER) { |
1205 | DBF_EVENT(6, "TAPE:nodev\n"); | |
1206 | rc = -ENODEV; | |
1207 | } else if (device->tape_state == TS_IN_USE) { | |
1208 | DBF_EVENT(6, "TAPE:dbusy\n"); | |
1209 | rc = -EBUSY; | |
1210 | } else if (device->tape_state == TS_BLKUSE) { | |
1211 | DBF_EVENT(6, "TAPE:dbusy\n"); | |
1212 | rc = -EBUSY; | |
1213 | } else if (device->discipline != NULL && | |
1214 | !try_module_get(device->discipline->owner)) { | |
1215 | DBF_EVENT(6, "TAPE:nodisc\n"); | |
1216 | rc = -ENODEV; | |
1217 | } else { | |
1218 | tape_state_set(device, TS_IN_USE); | |
1219 | rc = 0; | |
1220 | } | |
b3c21e49 | 1221 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1da177e4 LT |
1222 | return rc; |
1223 | } | |
1224 | ||
1225 | /* | |
1226 | * Tape device release function used by tape_char & tape_block frontends. | |
1227 | */ | |
1228 | int | |
1229 | tape_release(struct tape_device *device) | |
1230 | { | |
b3c21e49 | 1231 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1da177e4 LT |
1232 | if (device->tape_state == TS_IN_USE) |
1233 | tape_state_set(device, TS_UNUSED); | |
1234 | module_put(device->discipline->owner); | |
b3c21e49 | 1235 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1da177e4 LT |
1236 | return 0; |
1237 | } | |
1238 | ||
1239 | /* | |
1240 | * Execute a magnetic tape command a number of times. | |
1241 | */ | |
1242 | int | |
1243 | tape_mtop(struct tape_device *device, int mt_op, int mt_count) | |
1244 | { | |
1245 | tape_mtop_fn fn; | |
1246 | int rc; | |
1247 | ||
1248 | DBF_EVENT(6, "TAPE:mtio\n"); | |
1249 | DBF_EVENT(6, "TAPE:ioop: %x\n", mt_op); | |
1250 | DBF_EVENT(6, "TAPE:arg: %x\n", mt_count); | |
1251 | ||
1252 | if (mt_op < 0 || mt_op >= TAPE_NR_MTOPS) | |
1253 | return -EINVAL; | |
1254 | fn = device->discipline->mtop_array[mt_op]; | |
1255 | if (fn == NULL) | |
1256 | return -EINVAL; | |
1257 | ||
1258 | /* We assume that the backends can handle count up to 500. */ | |
1259 | if (mt_op == MTBSR || mt_op == MTFSR || mt_op == MTFSF || | |
1260 | mt_op == MTBSF || mt_op == MTFSFM || mt_op == MTBSFM) { | |
1261 | rc = 0; | |
1262 | for (; mt_count > 500; mt_count -= 500) | |
1263 | if ((rc = fn(device, 500)) != 0) | |
1264 | break; | |
1265 | if (rc == 0) | |
1266 | rc = fn(device, mt_count); | |
1267 | } else | |
1268 | rc = fn(device, mt_count); | |
1269 | return rc; | |
1270 | ||
1271 | } | |
1272 | ||
1273 | /* | |
1274 | * Tape init function. | |
1275 | */ | |
1276 | static int | |
1277 | tape_init (void) | |
1278 | { | |
66a464db | 1279 | TAPE_DBF_AREA = debug_register ( "tape", 2, 2, 4*sizeof(long)); |
1da177e4 LT |
1280 | debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view); |
1281 | #ifdef DBF_LIKE_HELL | |
1282 | debug_set_level(TAPE_DBF_AREA, 6); | |
1283 | #endif | |
e018ba1f | 1284 | DBF_EVENT(3, "tape init\n"); |
1da177e4 LT |
1285 | tape_proc_init(); |
1286 | tapechar_init (); | |
1287 | tapeblock_init (); | |
1288 | return 0; | |
1289 | } | |
1290 | ||
1291 | /* | |
1292 | * Tape exit function. | |
1293 | */ | |
1294 | static void | |
1295 | tape_exit(void) | |
1296 | { | |
1297 | DBF_EVENT(6, "tape exit\n"); | |
1298 | ||
1299 | /* Get rid of the frontends */ | |
1300 | tapechar_exit(); | |
1301 | tapeblock_exit(); | |
1302 | tape_proc_cleanup(); | |
1303 | debug_unregister (TAPE_DBF_AREA); | |
1304 | } | |
1305 | ||
1306 | MODULE_AUTHOR("(C) 2001 IBM Deutschland Entwicklung GmbH by Carsten Otte and " | |
1307 | "Michael Holzheu (cotte@de.ibm.com,holzheu@de.ibm.com)"); | |
e018ba1f | 1308 | MODULE_DESCRIPTION("Linux on zSeries channel attached tape device driver"); |
1da177e4 LT |
1309 | MODULE_LICENSE("GPL"); |
1310 | ||
1311 | module_init(tape_init); | |
1312 | module_exit(tape_exit); | |
1313 | ||
1314 | EXPORT_SYMBOL(tape_generic_remove); | |
1315 | EXPORT_SYMBOL(tape_generic_probe); | |
1316 | EXPORT_SYMBOL(tape_generic_online); | |
1317 | EXPORT_SYMBOL(tape_generic_offline); | |
1318 | EXPORT_SYMBOL(tape_put_device); | |
1319 | EXPORT_SYMBOL(tape_get_device_reference); | |
1320 | EXPORT_SYMBOL(tape_state_verbose); | |
1321 | EXPORT_SYMBOL(tape_op_verbose); | |
1322 | EXPORT_SYMBOL(tape_state_set); | |
1323 | EXPORT_SYMBOL(tape_med_state_set); | |
1324 | EXPORT_SYMBOL(tape_alloc_request); | |
1325 | EXPORT_SYMBOL(tape_free_request); | |
1326 | EXPORT_SYMBOL(tape_dump_sense); | |
1327 | EXPORT_SYMBOL(tape_dump_sense_dbf); | |
1328 | EXPORT_SYMBOL(tape_do_io); | |
1329 | EXPORT_SYMBOL(tape_do_io_async); | |
1330 | EXPORT_SYMBOL(tape_do_io_interruptible); | |
5f384338 | 1331 | EXPORT_SYMBOL(tape_cancel_io); |
1da177e4 | 1332 | EXPORT_SYMBOL(tape_mtop); |