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 | |
3ef32e62 | 6 | * Copyright IBM Corp. 2001, 2009 |
1da177e4 LT |
7 | * Author(s): Carsten Otte <cotte@de.ibm.com> |
8 | * Michael Holzheu <holzheu@de.ibm.com> | |
9 | * Tuan Ngo-Anh <ngoanh@de.ibm.com> | |
10 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
4111796d | 11 | * Stefan Bader <shbader@de.ibm.com> |
1da177e4 LT |
12 | */ |
13 | ||
ab640db0 | 14 | #define KMSG_COMPONENT "tape" |
bb509912 MH |
15 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
16 | ||
1da177e4 LT |
17 | #include <linux/module.h> |
18 | #include <linux/init.h> // for kernel parameters | |
19 | #include <linux/kmod.h> // for requesting modules | |
20 | #include <linux/spinlock.h> // for locks | |
21 | #include <linux/vmalloc.h> | |
22 | #include <linux/list.h> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
1da177e4 LT |
24 | |
25 | #include <asm/types.h> // for variable types | |
26 | ||
27 | #define TAPE_DBF_AREA tape_core_dbf | |
28 | ||
29 | #include "tape.h" | |
30 | #include "tape_std.h" | |
31 | ||
cced1dd4 | 32 | #define LONG_BUSY_TIMEOUT 180 /* seconds */ |
1da177e4 LT |
33 | |
34 | static void __tape_do_irq (struct ccw_device *, unsigned long, struct irb *); | |
c1637532 | 35 | static void tape_delayed_next_request(struct work_struct *); |
cced1dd4 | 36 | static void tape_long_busy_timeout(unsigned long data); |
1da177e4 LT |
37 | |
38 | /* | |
39 | * One list to contain all tape devices of all disciplines, so | |
40 | * we can assign the devices to minor numbers of the same major | |
41 | * The list is protected by the rwlock | |
42 | */ | |
c11ca97e | 43 | static LIST_HEAD(tape_device_list); |
1da177e4 LT |
44 | static DEFINE_RWLOCK(tape_device_lock); |
45 | ||
46 | /* | |
47 | * Pointer to debug area. | |
48 | */ | |
49 | debug_info_t *TAPE_DBF_AREA = NULL; | |
50 | EXPORT_SYMBOL(TAPE_DBF_AREA); | |
51 | ||
52 | /* | |
53 | * Printable strings for tape enumerations. | |
54 | */ | |
55 | const char *tape_state_verbose[TS_SIZE] = | |
56 | { | |
57 | [TS_UNUSED] = "UNUSED", | |
58 | [TS_IN_USE] = "IN_USE", | |
59 | [TS_BLKUSE] = "BLKUSE", | |
60 | [TS_INIT] = "INIT ", | |
61 | [TS_NOT_OPER] = "NOT_OP" | |
62 | }; | |
63 | ||
64 | const char *tape_op_verbose[TO_SIZE] = | |
65 | { | |
66 | [TO_BLOCK] = "BLK", [TO_BSB] = "BSB", | |
67 | [TO_BSF] = "BSF", [TO_DSE] = "DSE", | |
68 | [TO_FSB] = "FSB", [TO_FSF] = "FSF", | |
69 | [TO_LBL] = "LBL", [TO_NOP] = "NOP", | |
70 | [TO_RBA] = "RBA", [TO_RBI] = "RBI", | |
71 | [TO_RFO] = "RFO", [TO_REW] = "REW", | |
72 | [TO_RUN] = "RUN", [TO_WRI] = "WRI", | |
73 | [TO_WTM] = "WTM", [TO_MSEN] = "MSN", | |
74 | [TO_LOAD] = "LOA", [TO_READ_CONFIG] = "RCF", | |
75 | [TO_READ_ATTMSG] = "RAT", | |
76 | [TO_DIS] = "DIS", [TO_ASSIGN] = "ASS", | |
cced1dd4 MH |
77 | [TO_UNASSIGN] = "UAS", [TO_CRYPT_ON] = "CON", |
78 | [TO_CRYPT_OFF] = "COF", [TO_KEKL_SET] = "KLS", | |
e2963062 | 79 | [TO_KEKL_QUERY] = "KLQ",[TO_RDC] = "RDC", |
1da177e4 LT |
80 | }; |
81 | ||
f455adcf | 82 | static int devid_to_int(struct ccw_dev_id *dev_id) |
1da177e4 | 83 | { |
f455adcf | 84 | return dev_id->devno + (dev_id->ssid << 16); |
1da177e4 LT |
85 | } |
86 | ||
87 | /* | |
88 | * Some channel attached tape specific attributes. | |
89 | * | |
90 | * FIXME: In the future the first_minor and blocksize attribute should be | |
91 | * replaced by a link to the cdev tree. | |
92 | */ | |
93 | static ssize_t | |
3fd3c0a5 | 94 | tape_medium_state_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
95 | { |
96 | struct tape_device *tdev; | |
97 | ||
dff59b64 | 98 | tdev = dev_get_drvdata(dev); |
1da177e4 LT |
99 | return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->medium_state); |
100 | } | |
101 | ||
102 | static | |
103 | DEVICE_ATTR(medium_state, 0444, tape_medium_state_show, NULL); | |
104 | ||
105 | static ssize_t | |
3fd3c0a5 | 106 | tape_first_minor_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
107 | { |
108 | struct tape_device *tdev; | |
109 | ||
dff59b64 | 110 | tdev = dev_get_drvdata(dev); |
1da177e4 LT |
111 | return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->first_minor); |
112 | } | |
113 | ||
114 | static | |
115 | DEVICE_ATTR(first_minor, 0444, tape_first_minor_show, NULL); | |
116 | ||
117 | static ssize_t | |
3fd3c0a5 | 118 | tape_state_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
119 | { |
120 | struct tape_device *tdev; | |
121 | ||
dff59b64 | 122 | tdev = dev_get_drvdata(dev); |
1da177e4 LT |
123 | return scnprintf(buf, PAGE_SIZE, "%s\n", (tdev->first_minor < 0) ? |
124 | "OFFLINE" : tape_state_verbose[tdev->tape_state]); | |
125 | } | |
126 | ||
127 | static | |
128 | DEVICE_ATTR(state, 0444, tape_state_show, NULL); | |
129 | ||
130 | static ssize_t | |
3fd3c0a5 | 131 | tape_operation_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
132 | { |
133 | struct tape_device *tdev; | |
134 | ssize_t rc; | |
135 | ||
dff59b64 | 136 | tdev = dev_get_drvdata(dev); |
1da177e4 LT |
137 | if (tdev->first_minor < 0) |
138 | return scnprintf(buf, PAGE_SIZE, "N/A\n"); | |
139 | ||
140 | spin_lock_irq(get_ccwdev_lock(tdev->cdev)); | |
141 | if (list_empty(&tdev->req_queue)) | |
142 | rc = scnprintf(buf, PAGE_SIZE, "---\n"); | |
143 | else { | |
144 | struct tape_request *req; | |
145 | ||
146 | req = list_entry(tdev->req_queue.next, struct tape_request, | |
147 | list); | |
148 | rc = scnprintf(buf,PAGE_SIZE, "%s\n", tape_op_verbose[req->op]); | |
149 | } | |
150 | spin_unlock_irq(get_ccwdev_lock(tdev->cdev)); | |
151 | return rc; | |
152 | } | |
153 | ||
154 | static | |
155 | DEVICE_ATTR(operation, 0444, tape_operation_show, NULL); | |
156 | ||
157 | static ssize_t | |
3fd3c0a5 | 158 | tape_blocksize_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
159 | { |
160 | struct tape_device *tdev; | |
161 | ||
dff59b64 | 162 | tdev = dev_get_drvdata(dev); |
1da177e4 LT |
163 | |
164 | return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->char_data.block_size); | |
165 | } | |
166 | ||
167 | static | |
168 | DEVICE_ATTR(blocksize, 0444, tape_blocksize_show, NULL); | |
169 | ||
170 | static struct attribute *tape_attrs[] = { | |
171 | &dev_attr_medium_state.attr, | |
172 | &dev_attr_first_minor.attr, | |
173 | &dev_attr_state.attr, | |
174 | &dev_attr_operation.attr, | |
175 | &dev_attr_blocksize.attr, | |
176 | NULL | |
177 | }; | |
178 | ||
179 | static struct attribute_group tape_attr_group = { | |
180 | .attrs = tape_attrs, | |
181 | }; | |
182 | ||
183 | /* | |
184 | * Tape state functions | |
185 | */ | |
186 | void | |
187 | tape_state_set(struct tape_device *device, enum tape_state newstate) | |
188 | { | |
189 | const char *str; | |
190 | ||
191 | if (device->tape_state == TS_NOT_OPER) { | |
192 | DBF_EVENT(3, "ts_set err: not oper\n"); | |
193 | return; | |
194 | } | |
195 | DBF_EVENT(4, "ts. dev: %x\n", device->first_minor); | |
f976069a PO |
196 | DBF_EVENT(4, "old ts:\t\n"); |
197 | if (device->tape_state < TS_SIZE && device->tape_state >=0 ) | |
1da177e4 LT |
198 | str = tape_state_verbose[device->tape_state]; |
199 | else | |
200 | str = "UNKNOWN TS"; | |
201 | DBF_EVENT(4, "%s\n", str); | |
202 | DBF_EVENT(4, "new ts:\t\n"); | |
f976069a | 203 | if (newstate < TS_SIZE && newstate >= 0) |
1da177e4 LT |
204 | str = tape_state_verbose[newstate]; |
205 | else | |
206 | str = "UNKNOWN TS"; | |
207 | DBF_EVENT(4, "%s\n", str); | |
208 | device->tape_state = newstate; | |
209 | wake_up(&device->state_change_wq); | |
210 | } | |
211 | ||
212 | void | |
213 | tape_med_state_set(struct tape_device *device, enum tape_medium_state newstate) | |
214 | { | |
215 | if (device->medium_state == newstate) | |
216 | return; | |
217 | switch(newstate){ | |
218 | case MS_UNLOADED: | |
219 | device->tape_generic_status |= GMT_DR_OPEN(~0); | |
53f8c573 | 220 | if (device->medium_state == MS_LOADED) |
59e36927 MH |
221 | pr_info("%s: The tape cartridge has been successfully " |
222 | "unloaded\n", dev_name(&device->cdev->dev)); | |
1da177e4 LT |
223 | break; |
224 | case MS_LOADED: | |
225 | device->tape_generic_status &= ~GMT_DR_OPEN(~0); | |
53f8c573 | 226 | if (device->medium_state == MS_UNLOADED) |
59e36927 MH |
227 | pr_info("%s: A tape cartridge has been mounted\n", |
228 | dev_name(&device->cdev->dev)); | |
1da177e4 LT |
229 | break; |
230 | default: | |
231 | // print nothing | |
232 | break; | |
233 | } | |
234 | device->medium_state = newstate; | |
235 | wake_up(&device->state_change_wq); | |
236 | } | |
237 | ||
238 | /* | |
239 | * Stop running ccw. Has to be called with the device lock held. | |
240 | */ | |
4d284cac | 241 | static int |
4111796d | 242 | __tape_cancel_io(struct tape_device *device, struct tape_request *request) |
1da177e4 LT |
243 | { |
244 | int retries; | |
245 | int rc; | |
246 | ||
247 | /* Check if interrupt has already been processed */ | |
248 | if (request->callback == NULL) | |
249 | return 0; | |
250 | ||
251 | rc = 0; | |
252 | for (retries = 0; retries < 5; retries++) { | |
253 | rc = ccw_device_clear(device->cdev, (long) request); | |
254 | ||
4111796d SB |
255 | switch (rc) { |
256 | case 0: | |
257 | request->status = TAPE_REQUEST_DONE; | |
258 | return 0; | |
259 | case -EBUSY: | |
260 | request->status = TAPE_REQUEST_CANCEL; | |
c1637532 | 261 | schedule_delayed_work(&device->tape_dnr, 0); |
4111796d SB |
262 | return 0; |
263 | case -ENODEV: | |
264 | DBF_EXCEPTION(2, "device gone, retry\n"); | |
265 | break; | |
266 | case -EIO: | |
267 | DBF_EXCEPTION(2, "I/O error, retry\n"); | |
268 | break; | |
269 | default: | |
270 | BUG(); | |
1da177e4 | 271 | } |
1da177e4 LT |
272 | } |
273 | ||
274 | return rc; | |
275 | } | |
276 | ||
277 | /* | |
278 | * Add device into the sorted list, giving it the first | |
279 | * available minor number. | |
280 | */ | |
281 | static int | |
282 | tape_assign_minor(struct tape_device *device) | |
283 | { | |
284 | struct tape_device *tmp; | |
285 | int minor; | |
286 | ||
287 | minor = 0; | |
288 | write_lock(&tape_device_lock); | |
289 | list_for_each_entry(tmp, &tape_device_list, node) { | |
290 | if (minor < tmp->first_minor) | |
291 | break; | |
292 | minor += TAPE_MINORS_PER_DEV; | |
293 | } | |
294 | if (minor >= 256) { | |
295 | write_unlock(&tape_device_lock); | |
296 | return -ENODEV; | |
297 | } | |
298 | device->first_minor = minor; | |
299 | list_add_tail(&device->node, &tmp->node); | |
300 | write_unlock(&tape_device_lock); | |
301 | return 0; | |
302 | } | |
303 | ||
304 | /* remove device from the list */ | |
305 | static void | |
306 | tape_remove_minor(struct tape_device *device) | |
307 | { | |
308 | write_lock(&tape_device_lock); | |
309 | list_del_init(&device->node); | |
310 | device->first_minor = -1; | |
311 | write_unlock(&tape_device_lock); | |
312 | } | |
313 | ||
314 | /* | |
315 | * Set a device online. | |
316 | * | |
317 | * This function is called by the common I/O layer to move a device from the | |
318 | * detected but offline into the online state. | |
319 | * If we return an error (RC < 0) the device remains in the offline state. This | |
320 | * can happen if the device is assigned somewhere else, for example. | |
321 | */ | |
322 | int | |
323 | tape_generic_online(struct tape_device *device, | |
324 | struct tape_discipline *discipline) | |
325 | { | |
326 | int rc; | |
327 | ||
328 | DBF_LH(6, "tape_enable_device(%p, %p)\n", device, discipline); | |
329 | ||
330 | if (device->tape_state != TS_INIT) { | |
331 | DBF_LH(3, "Tapestate not INIT (%d)\n", device->tape_state); | |
332 | return -EINVAL; | |
333 | } | |
334 | ||
cced1dd4 MH |
335 | init_timer(&device->lb_timeout); |
336 | device->lb_timeout.function = tape_long_busy_timeout; | |
337 | ||
1da177e4 LT |
338 | /* Let the discipline have a go at the device. */ |
339 | device->discipline = discipline; | |
340 | if (!try_module_get(discipline->owner)) { | |
1da177e4 LT |
341 | return -EINVAL; |
342 | } | |
343 | ||
344 | rc = discipline->setup_device(device); | |
345 | if (rc) | |
346 | goto out; | |
347 | rc = tape_assign_minor(device); | |
348 | if (rc) | |
349 | goto out_discipline; | |
350 | ||
351 | rc = tapechar_setup_device(device); | |
352 | if (rc) | |
353 | goto out_minor; | |
354 | rc = tapeblock_setup_device(device); | |
355 | if (rc) | |
356 | goto out_char; | |
357 | ||
358 | tape_state_set(device, TS_UNUSED); | |
359 | ||
360 | DBF_LH(3, "(%08x): Drive set online\n", device->cdev_id); | |
361 | ||
362 | return 0; | |
363 | ||
364 | out_char: | |
365 | tapechar_cleanup_device(device); | |
68d36bdb RK |
366 | out_minor: |
367 | tape_remove_minor(device); | |
1da177e4 LT |
368 | out_discipline: |
369 | device->discipline->cleanup_device(device); | |
370 | device->discipline = NULL; | |
1da177e4 LT |
371 | out: |
372 | module_put(discipline->owner); | |
373 | return rc; | |
374 | } | |
375 | ||
4d284cac | 376 | static void |
1da177e4 LT |
377 | tape_cleanup_device(struct tape_device *device) |
378 | { | |
379 | tapeblock_cleanup_device(device); | |
380 | tapechar_cleanup_device(device); | |
381 | device->discipline->cleanup_device(device); | |
382 | module_put(device->discipline->owner); | |
383 | tape_remove_minor(device); | |
384 | tape_med_state_set(device, MS_UNKNOWN); | |
385 | } | |
386 | ||
3ef32e62 FM |
387 | /* |
388 | * Suspend device. | |
389 | * | |
390 | * Called by the common I/O layer if the drive should be suspended on user | |
391 | * request. We refuse to suspend if the device is loaded or in use for the | |
392 | * following reason: | |
393 | * While the Linux guest is suspended, it might be logged off which causes | |
394 | * devices to be detached. Tape devices are automatically rewound and unloaded | |
395 | * during DETACH processing (unless the tape device was attached with the | |
396 | * NOASSIGN or MULTIUSER option). After rewind/unload, there is no way to | |
397 | * resume the original state of the tape device, since we would need to | |
398 | * manually re-load the cartridge which was active at suspend time. | |
399 | */ | |
400 | int tape_generic_pm_suspend(struct ccw_device *cdev) | |
401 | { | |
402 | struct tape_device *device; | |
403 | ||
4f0076f7 | 404 | device = dev_get_drvdata(&cdev->dev); |
3ef32e62 FM |
405 | if (!device) { |
406 | return -ENODEV; | |
407 | } | |
408 | ||
409 | DBF_LH(3, "(%08x): tape_generic_pm_suspend(%p)\n", | |
410 | device->cdev_id, device); | |
411 | ||
412 | if (device->medium_state != MS_UNLOADED) { | |
413 | pr_err("A cartridge is loaded in tape device %s, " | |
414 | "refusing to suspend\n", dev_name(&cdev->dev)); | |
415 | return -EBUSY; | |
416 | } | |
417 | ||
418 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
419 | switch (device->tape_state) { | |
420 | case TS_INIT: | |
421 | case TS_NOT_OPER: | |
422 | case TS_UNUSED: | |
423 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
424 | break; | |
425 | default: | |
426 | pr_err("Tape device %s is busy, refusing to " | |
427 | "suspend\n", dev_name(&cdev->dev)); | |
428 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
429 | return -EBUSY; | |
430 | } | |
431 | ||
432 | DBF_LH(3, "(%08x): Drive suspended.\n", device->cdev_id); | |
433 | return 0; | |
434 | } | |
435 | ||
1da177e4 LT |
436 | /* |
437 | * Set device offline. | |
438 | * | |
439 | * Called by the common I/O layer if the drive should set offline on user | |
440 | * request. We may prevent this by returning an error. | |
441 | * Manual offline is only allowed while the drive is not in use. | |
442 | */ | |
443 | int | |
4d7a3cdf | 444 | tape_generic_offline(struct ccw_device *cdev) |
1da177e4 | 445 | { |
4d7a3cdf FM |
446 | struct tape_device *device; |
447 | ||
dff59b64 | 448 | device = dev_get_drvdata(&cdev->dev); |
1da177e4 | 449 | if (!device) { |
1da177e4 LT |
450 | return -ENODEV; |
451 | } | |
452 | ||
453 | DBF_LH(3, "(%08x): tape_generic_offline(%p)\n", | |
454 | device->cdev_id, device); | |
455 | ||
456 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
457 | switch (device->tape_state) { | |
458 | case TS_INIT: | |
459 | case TS_NOT_OPER: | |
460 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
461 | break; | |
462 | case TS_UNUSED: | |
463 | tape_state_set(device, TS_INIT); | |
464 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
465 | tape_cleanup_device(device); | |
466 | break; | |
467 | default: | |
468 | DBF_EVENT(3, "(%08x): Set offline failed " | |
469 | "- drive in use.\n", | |
470 | device->cdev_id); | |
1da177e4 LT |
471 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
472 | return -EBUSY; | |
473 | } | |
474 | ||
475 | DBF_LH(3, "(%08x): Drive set offline.\n", device->cdev_id); | |
476 | return 0; | |
477 | } | |
478 | ||
479 | /* | |
480 | * Allocate memory for a new device structure. | |
481 | */ | |
482 | static struct tape_device * | |
483 | tape_alloc_device(void) | |
484 | { | |
485 | struct tape_device *device; | |
486 | ||
88abaab4 | 487 | device = kzalloc(sizeof(struct tape_device), GFP_KERNEL); |
1da177e4 LT |
488 | if (device == NULL) { |
489 | DBF_EXCEPTION(2, "ti:no mem\n"); | |
1da177e4 LT |
490 | return ERR_PTR(-ENOMEM); |
491 | } | |
88abaab4 | 492 | device->modeset_byte = kmalloc(1, GFP_KERNEL | GFP_DMA); |
1da177e4 LT |
493 | if (device->modeset_byte == NULL) { |
494 | DBF_EXCEPTION(2, "ti:no mem\n"); | |
1da177e4 LT |
495 | kfree(device); |
496 | return ERR_PTR(-ENOMEM); | |
497 | } | |
369a4632 | 498 | mutex_init(&device->mutex); |
1da177e4 LT |
499 | INIT_LIST_HEAD(&device->req_queue); |
500 | INIT_LIST_HEAD(&device->node); | |
501 | init_waitqueue_head(&device->state_change_wq); | |
4657fb8a | 502 | init_waitqueue_head(&device->wait_queue); |
1da177e4 LT |
503 | device->tape_state = TS_INIT; |
504 | device->medium_state = MS_UNKNOWN; | |
505 | *device->modeset_byte = 0; | |
506 | device->first_minor = -1; | |
507 | atomic_set(&device->ref_count, 1); | |
c1637532 | 508 | INIT_DELAYED_WORK(&device->tape_dnr, tape_delayed_next_request); |
1da177e4 LT |
509 | |
510 | return device; | |
511 | } | |
512 | ||
513 | /* | |
514 | * Get a reference to an existing device structure. This will automatically | |
515 | * increment the reference count. | |
516 | */ | |
517 | struct tape_device * | |
8fd138c3 | 518 | tape_get_device(struct tape_device *device) |
1da177e4 | 519 | { |
8fd138c3 | 520 | int count; |
1da177e4 | 521 | |
8fd138c3 MS |
522 | count = atomic_inc_return(&device->ref_count); |
523 | DBF_EVENT(4, "tape_get_device(%p) = %i\n", device, count); | |
1da177e4 LT |
524 | return device; |
525 | } | |
526 | ||
527 | /* | |
528 | * Decrease the reference counter of a devices structure. If the | |
529 | * reference counter reaches zero free the device structure. | |
530 | * The function returns a NULL pointer to be used by the caller | |
531 | * for clearing reference pointers. | |
532 | */ | |
8fd138c3 | 533 | void |
1da177e4 LT |
534 | tape_put_device(struct tape_device *device) |
535 | { | |
8fd138c3 | 536 | int count; |
1da177e4 | 537 | |
8fd138c3 MS |
538 | count = atomic_dec_return(&device->ref_count); |
539 | DBF_EVENT(4, "tape_put_device(%p) -> %i\n", device, count); | |
540 | BUG_ON(count < 0); | |
541 | if (count == 0) { | |
542 | kfree(device->modeset_byte); | |
543 | kfree(device); | |
1da177e4 | 544 | } |
1da177e4 LT |
545 | } |
546 | ||
547 | /* | |
548 | * Find tape device by a device index. | |
549 | */ | |
550 | struct tape_device * | |
8fd138c3 | 551 | tape_find_device(int devindex) |
1da177e4 LT |
552 | { |
553 | struct tape_device *device, *tmp; | |
554 | ||
555 | device = ERR_PTR(-ENODEV); | |
556 | read_lock(&tape_device_lock); | |
557 | list_for_each_entry(tmp, &tape_device_list, node) { | |
558 | if (tmp->first_minor / TAPE_MINORS_PER_DEV == devindex) { | |
8fd138c3 | 559 | device = tape_get_device(tmp); |
1da177e4 LT |
560 | break; |
561 | } | |
562 | } | |
563 | read_unlock(&tape_device_lock); | |
564 | return device; | |
565 | } | |
566 | ||
567 | /* | |
568 | * Driverfs tape probe function. | |
569 | */ | |
570 | int | |
571 | tape_generic_probe(struct ccw_device *cdev) | |
572 | { | |
573 | struct tape_device *device; | |
d7cf0d57 | 574 | int ret; |
f455adcf | 575 | struct ccw_dev_id dev_id; |
1da177e4 LT |
576 | |
577 | device = tape_alloc_device(); | |
578 | if (IS_ERR(device)) | |
579 | return -ENODEV; | |
454e1fa1 PO |
580 | ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP | |
581 | CCWDEV_DO_MULTIPATH); | |
d7cf0d57 HC |
582 | ret = sysfs_create_group(&cdev->dev.kobj, &tape_attr_group); |
583 | if (ret) { | |
584 | tape_put_device(device); | |
d7cf0d57 HC |
585 | return ret; |
586 | } | |
dff59b64 | 587 | dev_set_drvdata(&cdev->dev, device); |
d7cf0d57 | 588 | cdev->handler = __tape_do_irq; |
1da177e4 | 589 | device->cdev = cdev; |
f455adcf CH |
590 | ccw_device_get_id(cdev, &dev_id); |
591 | device->cdev_id = devid_to_int(&dev_id); | |
d7cf0d57 | 592 | return ret; |
1da177e4 LT |
593 | } |
594 | ||
4d284cac | 595 | static void |
1da177e4 LT |
596 | __tape_discard_requests(struct tape_device *device) |
597 | { | |
598 | struct tape_request * request; | |
599 | struct list_head * l, *n; | |
600 | ||
601 | list_for_each_safe(l, n, &device->req_queue) { | |
602 | request = list_entry(l, struct tape_request, list); | |
603 | if (request->status == TAPE_REQUEST_IN_IO) | |
604 | request->status = TAPE_REQUEST_DONE; | |
605 | list_del(&request->list); | |
606 | ||
607 | /* Decrease ref_count for removed request. */ | |
8fd138c3 MS |
608 | request->device = NULL; |
609 | tape_put_device(device); | |
1da177e4 LT |
610 | request->rc = -EIO; |
611 | if (request->callback != NULL) | |
612 | request->callback(request, request->callback_data); | |
613 | } | |
614 | } | |
615 | ||
616 | /* | |
617 | * Driverfs tape remove function. | |
618 | * | |
619 | * This function is called whenever the common I/O layer detects the device | |
620 | * gone. This can happen at any time and we cannot refuse. | |
621 | */ | |
622 | void | |
623 | tape_generic_remove(struct ccw_device *cdev) | |
624 | { | |
625 | struct tape_device * device; | |
626 | ||
dff59b64 | 627 | device = dev_get_drvdata(&cdev->dev); |
1da177e4 | 628 | if (!device) { |
1da177e4 LT |
629 | return; |
630 | } | |
631 | DBF_LH(3, "(%08x): tape_generic_remove(%p)\n", device->cdev_id, cdev); | |
632 | ||
633 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
634 | switch (device->tape_state) { | |
635 | case TS_INIT: | |
636 | tape_state_set(device, TS_NOT_OPER); | |
637 | case TS_NOT_OPER: | |
638 | /* | |
639 | * Nothing to do. | |
640 | */ | |
641 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
642 | break; | |
643 | case TS_UNUSED: | |
644 | /* | |
645 | * Need only to release the device. | |
646 | */ | |
647 | tape_state_set(device, TS_NOT_OPER); | |
648 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
649 | tape_cleanup_device(device); | |
650 | break; | |
651 | default: | |
652 | /* | |
653 | * There may be requests on the queue. We will not get | |
654 | * an interrupt for a request that was running. So we | |
655 | * just post them all as I/O errors. | |
656 | */ | |
657 | DBF_EVENT(3, "(%08x): Drive in use vanished!\n", | |
658 | device->cdev_id); | |
59e36927 MH |
659 | pr_warning("%s: A tape unit was detached while in " |
660 | "use\n", dev_name(&device->cdev->dev)); | |
1da177e4 LT |
661 | tape_state_set(device, TS_NOT_OPER); |
662 | __tape_discard_requests(device); | |
663 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
664 | tape_cleanup_device(device); | |
665 | } | |
666 | ||
8fd138c3 MS |
667 | device = dev_get_drvdata(&cdev->dev); |
668 | if (device) { | |
1da177e4 | 669 | sysfs_remove_group(&cdev->dev.kobj, &tape_attr_group); |
8fd138c3 MS |
670 | dev_set_drvdata(&cdev->dev, NULL); |
671 | tape_put_device(device); | |
1da177e4 LT |
672 | } |
673 | } | |
674 | ||
675 | /* | |
676 | * Allocate a new tape ccw request | |
677 | */ | |
678 | struct tape_request * | |
679 | tape_alloc_request(int cplength, int datasize) | |
680 | { | |
681 | struct tape_request *request; | |
682 | ||
6aa0d3a9 | 683 | BUG_ON(datasize > PAGE_SIZE || (cplength*sizeof(struct ccw1)) > PAGE_SIZE); |
1da177e4 LT |
684 | |
685 | DBF_LH(6, "tape_alloc_request(%d, %d)\n", cplength, datasize); | |
686 | ||
88abaab4 | 687 | request = kzalloc(sizeof(struct tape_request), GFP_KERNEL); |
1da177e4 LT |
688 | if (request == NULL) { |
689 | DBF_EXCEPTION(1, "cqra nomem\n"); | |
690 | return ERR_PTR(-ENOMEM); | |
691 | } | |
1da177e4 LT |
692 | /* allocate channel program */ |
693 | if (cplength > 0) { | |
88abaab4 | 694 | request->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
695 | GFP_ATOMIC | GFP_DMA); |
696 | if (request->cpaddr == NULL) { | |
697 | DBF_EXCEPTION(1, "cqra nomem\n"); | |
698 | kfree(request); | |
699 | return ERR_PTR(-ENOMEM); | |
700 | } | |
1da177e4 LT |
701 | } |
702 | /* alloc small kernel buffer */ | |
703 | if (datasize > 0) { | |
88abaab4 | 704 | request->cpdata = kzalloc(datasize, GFP_KERNEL | GFP_DMA); |
1da177e4 LT |
705 | if (request->cpdata == NULL) { |
706 | DBF_EXCEPTION(1, "cqra nomem\n"); | |
17fd682e | 707 | kfree(request->cpaddr); |
1da177e4 LT |
708 | kfree(request); |
709 | return ERR_PTR(-ENOMEM); | |
710 | } | |
1da177e4 LT |
711 | } |
712 | DBF_LH(6, "New request %p(%p/%p)\n", request, request->cpaddr, | |
713 | request->cpdata); | |
714 | ||
715 | return request; | |
716 | } | |
717 | ||
718 | /* | |
719 | * Free tape ccw request | |
720 | */ | |
721 | void | |
722 | tape_free_request (struct tape_request * request) | |
723 | { | |
724 | DBF_LH(6, "Free request %p\n", request); | |
725 | ||
8fd138c3 MS |
726 | if (request->device) |
727 | tape_put_device(request->device); | |
17fd682e JJ |
728 | kfree(request->cpdata); |
729 | kfree(request->cpaddr); | |
1da177e4 LT |
730 | kfree(request); |
731 | } | |
732 | ||
4d284cac | 733 | static int |
4111796d SB |
734 | __tape_start_io(struct tape_device *device, struct tape_request *request) |
735 | { | |
736 | int rc; | |
737 | ||
738 | #ifdef CONFIG_S390_TAPE_BLOCK | |
739 | if (request->op == TO_BLOCK) | |
740 | device->discipline->check_locate(device, request); | |
741 | #endif | |
742 | rc = ccw_device_start( | |
743 | device->cdev, | |
744 | request->cpaddr, | |
745 | (unsigned long) request, | |
746 | 0x00, | |
747 | request->options | |
748 | ); | |
749 | if (rc == 0) { | |
750 | request->status = TAPE_REQUEST_IN_IO; | |
751 | } else if (rc == -EBUSY) { | |
752 | /* The common I/O subsystem is currently busy. Retry later. */ | |
753 | request->status = TAPE_REQUEST_QUEUED; | |
c1637532 | 754 | schedule_delayed_work(&device->tape_dnr, 0); |
4111796d SB |
755 | rc = 0; |
756 | } else { | |
757 | /* Start failed. Remove request and indicate failure. */ | |
758 | DBF_EVENT(1, "tape: start request failed with RC = %i\n", rc); | |
759 | } | |
760 | return rc; | |
761 | } | |
762 | ||
4d284cac | 763 | static void |
4111796d | 764 | __tape_start_next_request(struct tape_device *device) |
1da177e4 LT |
765 | { |
766 | struct list_head *l, *n; | |
767 | struct tape_request *request; | |
768 | int rc; | |
769 | ||
4111796d | 770 | DBF_LH(6, "__tape_start_next_request(%p)\n", device); |
1da177e4 LT |
771 | /* |
772 | * Try to start each request on request queue until one is | |
773 | * started successful. | |
774 | */ | |
775 | list_for_each_safe(l, n, &device->req_queue) { | |
776 | request = list_entry(l, struct tape_request, list); | |
4111796d SB |
777 | |
778 | /* | |
779 | * Avoid race condition if bottom-half was triggered more than | |
780 | * once. | |
781 | */ | |
782 | if (request->status == TAPE_REQUEST_IN_IO) | |
783 | return; | |
5f384338 MH |
784 | /* |
785 | * Request has already been stopped. We have to wait until | |
786 | * the request is removed from the queue in the interrupt | |
787 | * handling. | |
788 | */ | |
789 | if (request->status == TAPE_REQUEST_DONE) | |
790 | return; | |
4111796d SB |
791 | |
792 | /* | |
793 | * We wanted to cancel the request but the common I/O layer | |
794 | * was busy at that time. This can only happen if this | |
795 | * function is called by delayed_next_request. | |
796 | * Otherwise we start the next request on the queue. | |
797 | */ | |
798 | if (request->status == TAPE_REQUEST_CANCEL) { | |
799 | rc = __tape_cancel_io(device, request); | |
800 | } else { | |
801 | rc = __tape_start_io(device, request); | |
1da177e4 | 802 | } |
4111796d SB |
803 | if (rc == 0) |
804 | return; | |
1da177e4 | 805 | |
4111796d | 806 | /* Set ending status. */ |
1da177e4 LT |
807 | request->rc = rc; |
808 | request->status = TAPE_REQUEST_DONE; | |
4111796d SB |
809 | |
810 | /* Remove from request queue. */ | |
811 | list_del(&request->list); | |
812 | ||
813 | /* Do callback. */ | |
814 | if (request->callback != NULL) | |
815 | request->callback(request, request->callback_data); | |
1da177e4 LT |
816 | } |
817 | } | |
818 | ||
819 | static void | |
c1637532 | 820 | tape_delayed_next_request(struct work_struct *work) |
1da177e4 | 821 | { |
c1637532 MS |
822 | struct tape_device *device = |
823 | container_of(work, struct tape_device, tape_dnr.work); | |
1da177e4 | 824 | |
4111796d SB |
825 | DBF_LH(6, "tape_delayed_next_request(%p)\n", device); |
826 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
827 | __tape_start_next_request(device); | |
828 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
829 | } | |
830 | ||
cced1dd4 MH |
831 | static void tape_long_busy_timeout(unsigned long data) |
832 | { | |
833 | struct tape_request *request; | |
834 | struct tape_device *device; | |
835 | ||
836 | device = (struct tape_device *) data; | |
837 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
838 | request = list_entry(device->req_queue.next, struct tape_request, list); | |
6aa0d3a9 | 839 | BUG_ON(request->status != TAPE_REQUEST_LONG_BUSY); |
cced1dd4 MH |
840 | DBF_LH(6, "%08x: Long busy timeout.\n", device->cdev_id); |
841 | __tape_start_next_request(device); | |
8fd138c3 MS |
842 | device->lb_timeout.data = 0UL; |
843 | tape_put_device(device); | |
cced1dd4 MH |
844 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
845 | } | |
846 | ||
4d284cac | 847 | static void |
4111796d SB |
848 | __tape_end_request( |
849 | struct tape_device * device, | |
850 | struct tape_request * request, | |
851 | int rc) | |
852 | { | |
853 | DBF_LH(6, "__tape_end_request(%p, %p, %i)\n", device, request, rc); | |
854 | if (request) { | |
855 | request->rc = rc; | |
856 | request->status = TAPE_REQUEST_DONE; | |
857 | ||
858 | /* Remove from request queue. */ | |
859 | list_del(&request->list); | |
860 | ||
861 | /* Do callback. */ | |
862 | if (request->callback != NULL) | |
863 | request->callback(request, request->callback_data); | |
864 | } | |
1da177e4 LT |
865 | |
866 | /* Start next request. */ | |
867 | if (!list_empty(&device->req_queue)) | |
4111796d | 868 | __tape_start_next_request(device); |
1da177e4 LT |
869 | } |
870 | ||
1da177e4 LT |
871 | /* |
872 | * Write sense data to dbf | |
873 | */ | |
874 | void | |
875 | tape_dump_sense_dbf(struct tape_device *device, struct tape_request *request, | |
876 | struct irb *irb) | |
877 | { | |
878 | unsigned int *sptr; | |
879 | const char* op; | |
880 | ||
881 | if (request != NULL) | |
882 | op = tape_op_verbose[request->op]; | |
883 | else | |
884 | op = "---"; | |
885 | DBF_EVENT(3, "DSTAT : %02x CSTAT: %02x\n", | |
23d805b6 | 886 | irb->scsw.cmd.dstat, irb->scsw.cmd.cstat); |
1da177e4 LT |
887 | DBF_EVENT(3, "DEVICE: %08x OP\t: %s\n", device->cdev_id, op); |
888 | sptr = (unsigned int *) irb->ecw; | |
889 | DBF_EVENT(3, "%08x %08x\n", sptr[0], sptr[1]); | |
890 | DBF_EVENT(3, "%08x %08x\n", sptr[2], sptr[3]); | |
891 | DBF_EVENT(3, "%08x %08x\n", sptr[4], sptr[5]); | |
892 | DBF_EVENT(3, "%08x %08x\n", sptr[6], sptr[7]); | |
893 | } | |
894 | ||
895 | /* | |
896 | * I/O helper function. Adds the request to the request queue | |
897 | * and starts it if the tape is idle. Has to be called with | |
898 | * the device lock held. | |
899 | */ | |
4d284cac | 900 | static int |
4111796d | 901 | __tape_start_request(struct tape_device *device, struct tape_request *request) |
1da177e4 LT |
902 | { |
903 | int rc; | |
904 | ||
905 | switch (request->op) { | |
906 | case TO_MSEN: | |
907 | case TO_ASSIGN: | |
908 | case TO_UNASSIGN: | |
909 | case TO_READ_ATTMSG: | |
e2963062 | 910 | case TO_RDC: |
1da177e4 LT |
911 | if (device->tape_state == TS_INIT) |
912 | break; | |
913 | if (device->tape_state == TS_UNUSED) | |
914 | break; | |
915 | default: | |
916 | if (device->tape_state == TS_BLKUSE) | |
917 | break; | |
918 | if (device->tape_state != TS_IN_USE) | |
919 | return -ENODEV; | |
920 | } | |
921 | ||
922 | /* Increase use count of device for the added request. */ | |
8fd138c3 | 923 | request->device = tape_get_device(device); |
1da177e4 LT |
924 | |
925 | if (list_empty(&device->req_queue)) { | |
926 | /* No other requests are on the queue. Start this one. */ | |
4111796d SB |
927 | rc = __tape_start_io(device, request); |
928 | if (rc) | |
1da177e4 | 929 | return rc; |
4111796d | 930 | |
1da177e4 LT |
931 | DBF_LH(5, "Request %p added for execution.\n", request); |
932 | list_add(&request->list, &device->req_queue); | |
1da177e4 LT |
933 | } else { |
934 | DBF_LH(5, "Request %p add to queue.\n", request); | |
1da177e4 | 935 | request->status = TAPE_REQUEST_QUEUED; |
4111796d | 936 | list_add_tail(&request->list, &device->req_queue); |
1da177e4 LT |
937 | } |
938 | return 0; | |
939 | } | |
940 | ||
941 | /* | |
942 | * Add the request to the request queue, try to start it if the | |
943 | * tape is idle. Return without waiting for end of i/o. | |
944 | */ | |
945 | int | |
946 | tape_do_io_async(struct tape_device *device, struct tape_request *request) | |
947 | { | |
948 | int rc; | |
949 | ||
950 | DBF_LH(6, "tape_do_io_async(%p, %p)\n", device, request); | |
951 | ||
952 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
953 | /* Add request to request queue and try to start it. */ | |
4111796d | 954 | rc = __tape_start_request(device, request); |
1da177e4 LT |
955 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
956 | return rc; | |
957 | } | |
958 | ||
959 | /* | |
960 | * tape_do_io/__tape_wake_up | |
961 | * Add the request to the request queue, try to start it if the | |
962 | * tape is idle and wait uninterruptible for its completion. | |
963 | */ | |
964 | static void | |
965 | __tape_wake_up(struct tape_request *request, void *data) | |
966 | { | |
967 | request->callback = NULL; | |
968 | wake_up((wait_queue_head_t *) data); | |
969 | } | |
970 | ||
971 | int | |
972 | tape_do_io(struct tape_device *device, struct tape_request *request) | |
973 | { | |
1da177e4 LT |
974 | int rc; |
975 | ||
1da177e4 LT |
976 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
977 | /* Setup callback */ | |
978 | request->callback = __tape_wake_up; | |
4657fb8a | 979 | request->callback_data = &device->wait_queue; |
1da177e4 | 980 | /* Add request to request queue and try to start it. */ |
4111796d | 981 | rc = __tape_start_request(device, request); |
1da177e4 LT |
982 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
983 | if (rc) | |
984 | return rc; | |
985 | /* Request added to the queue. Wait for its completion. */ | |
4657fb8a | 986 | wait_event(device->wait_queue, (request->callback == NULL)); |
1da177e4 LT |
987 | /* Get rc from request */ |
988 | return request->rc; | |
989 | } | |
990 | ||
991 | /* | |
992 | * tape_do_io_interruptible/__tape_wake_up_interruptible | |
993 | * Add the request to the request queue, try to start it if the | |
994 | * tape is idle and wait uninterruptible for its completion. | |
995 | */ | |
996 | static void | |
997 | __tape_wake_up_interruptible(struct tape_request *request, void *data) | |
998 | { | |
999 | request->callback = NULL; | |
1000 | wake_up_interruptible((wait_queue_head_t *) data); | |
1001 | } | |
1002 | ||
1003 | int | |
1004 | tape_do_io_interruptible(struct tape_device *device, | |
1005 | struct tape_request *request) | |
1006 | { | |
1da177e4 LT |
1007 | int rc; |
1008 | ||
1da177e4 LT |
1009 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1010 | /* Setup callback */ | |
1011 | request->callback = __tape_wake_up_interruptible; | |
4657fb8a | 1012 | request->callback_data = &device->wait_queue; |
4111796d | 1013 | rc = __tape_start_request(device, request); |
1da177e4 LT |
1014 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1015 | if (rc) | |
1016 | return rc; | |
1017 | /* Request added to the queue. Wait for its completion. */ | |
4657fb8a MS |
1018 | rc = wait_event_interruptible(device->wait_queue, |
1019 | (request->callback == NULL)); | |
1da177e4 LT |
1020 | if (rc != -ERESTARTSYS) |
1021 | /* Request finished normally. */ | |
1022 | return request->rc; | |
4111796d | 1023 | |
1da177e4 LT |
1024 | /* Interrupted by a signal. We have to stop the current request. */ |
1025 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
4111796d SB |
1026 | rc = __tape_cancel_io(device, request); |
1027 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 | 1028 | if (rc == 0) { |
4111796d SB |
1029 | /* Wait for the interrupt that acknowledges the halt. */ |
1030 | do { | |
1031 | rc = wait_event_interruptible( | |
4657fb8a | 1032 | device->wait_queue, |
4111796d SB |
1033 | (request->callback == NULL) |
1034 | ); | |
4cd190a7 | 1035 | } while (rc == -ERESTARTSYS); |
4111796d | 1036 | |
1da177e4 LT |
1037 | DBF_EVENT(3, "IO stopped on %08x\n", device->cdev_id); |
1038 | rc = -ERESTARTSYS; | |
1039 | } | |
1da177e4 LT |
1040 | return rc; |
1041 | } | |
1042 | ||
5f384338 MH |
1043 | /* |
1044 | * Stop running ccw. | |
1045 | */ | |
1046 | int | |
1047 | tape_cancel_io(struct tape_device *device, struct tape_request *request) | |
1048 | { | |
1049 | int rc; | |
1050 | ||
1051 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1052 | rc = __tape_cancel_io(device, request); | |
1053 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1054 | return rc; | |
1055 | } | |
1056 | ||
1da177e4 LT |
1057 | /* |
1058 | * Tape interrupt routine, called from the ccw_device layer | |
1059 | */ | |
1060 | static void | |
1061 | __tape_do_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb) | |
1062 | { | |
1063 | struct tape_device *device; | |
1064 | struct tape_request *request; | |
1da177e4 LT |
1065 | int rc; |
1066 | ||
dff59b64 | 1067 | device = dev_get_drvdata(&cdev->dev); |
1da177e4 | 1068 | if (device == NULL) { |
1da177e4 LT |
1069 | return; |
1070 | } | |
1071 | request = (struct tape_request *) intparm; | |
1072 | ||
1073 | DBF_LH(6, "__tape_do_irq(device=%p, request=%p)\n", device, request); | |
1074 | ||
1075 | /* On special conditions irb is an error pointer */ | |
1076 | if (IS_ERR(irb)) { | |
4111796d | 1077 | /* FIXME: What to do with the request? */ |
1da177e4 LT |
1078 | switch (PTR_ERR(irb)) { |
1079 | case -ETIMEDOUT: | |
f2166bb1 SO |
1080 | DBF_LH(1, "(%08x): Request timed out\n", |
1081 | device->cdev_id); | |
1da177e4 | 1082 | case -EIO: |
4111796d | 1083 | __tape_end_request(device, request, -EIO); |
1da177e4 LT |
1084 | break; |
1085 | default: | |
f2166bb1 SO |
1086 | DBF_LH(1, "(%08x): Unexpected i/o error %li\n", |
1087 | device->cdev_id, PTR_ERR(irb)); | |
1da177e4 LT |
1088 | } |
1089 | return; | |
1090 | } | |
1091 | ||
4111796d SB |
1092 | /* |
1093 | * If the condition code is not zero and the start function bit is | |
1094 | * still set, this is an deferred error and the last start I/O did | |
842d3fba SB |
1095 | * not succeed. At this point the condition that caused the deferred |
1096 | * error might still apply. So we just schedule the request to be | |
1097 | * started later. | |
4111796d | 1098 | */ |
23d805b6 PO |
1099 | if (irb->scsw.cmd.cc != 0 && |
1100 | (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) && | |
5f384338 MH |
1101 | (request->status == TAPE_REQUEST_IN_IO)) { |
1102 | DBF_EVENT(3,"(%08x): deferred cc=%i, fctl=%i. restarting\n", | |
23d805b6 | 1103 | device->cdev_id, irb->scsw.cmd.cc, irb->scsw.cmd.fctl); |
842d3fba | 1104 | request->status = TAPE_REQUEST_QUEUED; |
5f384338 | 1105 | schedule_delayed_work(&device->tape_dnr, HZ); |
4111796d SB |
1106 | return; |
1107 | } | |
1108 | ||
1da177e4 LT |
1109 | /* May be an unsolicited irq */ |
1110 | if(request != NULL) | |
23d805b6 PO |
1111 | request->rescnt = irb->scsw.cmd.count; |
1112 | else if ((irb->scsw.cmd.dstat == 0x85 || irb->scsw.cmd.dstat == 0x80) && | |
cced1dd4 MH |
1113 | !list_empty(&device->req_queue)) { |
1114 | /* Not Ready to Ready after long busy ? */ | |
1115 | struct tape_request *req; | |
1116 | req = list_entry(device->req_queue.next, | |
1117 | struct tape_request, list); | |
1118 | if (req->status == TAPE_REQUEST_LONG_BUSY) { | |
1119 | DBF_EVENT(3, "(%08x): del timer\n", device->cdev_id); | |
1120 | if (del_timer(&device->lb_timeout)) { | |
8fd138c3 MS |
1121 | device->lb_timeout.data = 0UL; |
1122 | tape_put_device(device); | |
cced1dd4 MH |
1123 | __tape_start_next_request(device); |
1124 | } | |
1125 | return; | |
1126 | } | |
1127 | } | |
23d805b6 | 1128 | if (irb->scsw.cmd.dstat != 0x0c) { |
1da177e4 LT |
1129 | /* Set the 'ONLINE' flag depending on sense byte 1 */ |
1130 | if(*(((__u8 *) irb->ecw) + 1) & SENSE_DRIVE_ONLINE) | |
1131 | device->tape_generic_status |= GMT_ONLINE(~0); | |
1132 | else | |
1133 | device->tape_generic_status &= ~GMT_ONLINE(~0); | |
1134 | ||
1135 | /* | |
1136 | * Any request that does not come back with channel end | |
1137 | * and device end is unusual. Log the sense data. | |
1138 | */ | |
1139 | DBF_EVENT(3,"-- Tape Interrupthandler --\n"); | |
1140 | tape_dump_sense_dbf(device, request, irb); | |
1141 | } else { | |
1142 | /* Upon normal completion the device _is_ online */ | |
1143 | device->tape_generic_status |= GMT_ONLINE(~0); | |
1144 | } | |
1145 | if (device->tape_state == TS_NOT_OPER) { | |
1146 | DBF_EVENT(6, "tape:device is not operational\n"); | |
1147 | return; | |
1148 | } | |
1149 | ||
1150 | /* | |
1151 | * Request that were canceled still come back with an interrupt. | |
1152 | * To detect these request the state will be set to TAPE_REQUEST_DONE. | |
1153 | */ | |
1154 | if(request != NULL && request->status == TAPE_REQUEST_DONE) { | |
4111796d | 1155 | __tape_end_request(device, request, -EIO); |
1da177e4 LT |
1156 | return; |
1157 | } | |
1158 | ||
1159 | rc = device->discipline->irq(device, request, irb); | |
1160 | /* | |
1161 | * rc < 0 : request finished unsuccessfully. | |
1162 | * rc == TAPE_IO_SUCCESS: request finished successfully. | |
1163 | * rc == TAPE_IO_PENDING: request is still running. Ignore rc. | |
1164 | * rc == TAPE_IO_RETRY: request finished but needs another go. | |
1165 | * rc == TAPE_IO_STOP: request needs to get terminated. | |
1166 | */ | |
1da177e4 | 1167 | switch (rc) { |
4111796d SB |
1168 | case TAPE_IO_SUCCESS: |
1169 | /* Upon normal completion the device _is_ online */ | |
1170 | device->tape_generic_status |= GMT_ONLINE(~0); | |
1171 | __tape_end_request(device, request, rc); | |
1172 | break; | |
1173 | case TAPE_IO_PENDING: | |
1174 | break; | |
cced1dd4 MH |
1175 | case TAPE_IO_LONG_BUSY: |
1176 | device->lb_timeout.data = | |
8fd138c3 | 1177 | (unsigned long) tape_get_device(device); |
cced1dd4 MH |
1178 | device->lb_timeout.expires = jiffies + |
1179 | LONG_BUSY_TIMEOUT * HZ; | |
1180 | DBF_EVENT(3, "(%08x): add timer\n", device->cdev_id); | |
1181 | add_timer(&device->lb_timeout); | |
1182 | request->status = TAPE_REQUEST_LONG_BUSY; | |
1183 | break; | |
4111796d SB |
1184 | case TAPE_IO_RETRY: |
1185 | rc = __tape_start_io(device, request); | |
1186 | if (rc) | |
1187 | __tape_end_request(device, request, rc); | |
1188 | break; | |
1189 | case TAPE_IO_STOP: | |
1190 | rc = __tape_cancel_io(device, request); | |
1191 | if (rc) | |
1192 | __tape_end_request(device, request, rc); | |
1193 | break; | |
1194 | default: | |
1195 | if (rc > 0) { | |
1196 | DBF_EVENT(6, "xunknownrc\n"); | |
4111796d SB |
1197 | __tape_end_request(device, request, -EIO); |
1198 | } else { | |
1199 | __tape_end_request(device, request, rc); | |
1200 | } | |
1201 | break; | |
1da177e4 LT |
1202 | } |
1203 | } | |
1204 | ||
1205 | /* | |
1206 | * Tape device open function used by tape_char & tape_block frontends. | |
1207 | */ | |
1208 | int | |
1209 | tape_open(struct tape_device *device) | |
1210 | { | |
1211 | int rc; | |
1212 | ||
b3c21e49 | 1213 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1da177e4 LT |
1214 | if (device->tape_state == TS_NOT_OPER) { |
1215 | DBF_EVENT(6, "TAPE:nodev\n"); | |
1216 | rc = -ENODEV; | |
1217 | } else if (device->tape_state == TS_IN_USE) { | |
1218 | DBF_EVENT(6, "TAPE:dbusy\n"); | |
1219 | rc = -EBUSY; | |
1220 | } else if (device->tape_state == TS_BLKUSE) { | |
1221 | DBF_EVENT(6, "TAPE:dbusy\n"); | |
1222 | rc = -EBUSY; | |
1223 | } else if (device->discipline != NULL && | |
1224 | !try_module_get(device->discipline->owner)) { | |
1225 | DBF_EVENT(6, "TAPE:nodisc\n"); | |
1226 | rc = -ENODEV; | |
1227 | } else { | |
1228 | tape_state_set(device, TS_IN_USE); | |
1229 | rc = 0; | |
1230 | } | |
b3c21e49 | 1231 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1da177e4 LT |
1232 | return rc; |
1233 | } | |
1234 | ||
1235 | /* | |
1236 | * Tape device release function used by tape_char & tape_block frontends. | |
1237 | */ | |
1238 | int | |
1239 | tape_release(struct tape_device *device) | |
1240 | { | |
b3c21e49 | 1241 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1da177e4 LT |
1242 | if (device->tape_state == TS_IN_USE) |
1243 | tape_state_set(device, TS_UNUSED); | |
1244 | module_put(device->discipline->owner); | |
b3c21e49 | 1245 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1da177e4 LT |
1246 | return 0; |
1247 | } | |
1248 | ||
1249 | /* | |
1250 | * Execute a magnetic tape command a number of times. | |
1251 | */ | |
1252 | int | |
1253 | tape_mtop(struct tape_device *device, int mt_op, int mt_count) | |
1254 | { | |
1255 | tape_mtop_fn fn; | |
1256 | int rc; | |
1257 | ||
1258 | DBF_EVENT(6, "TAPE:mtio\n"); | |
1259 | DBF_EVENT(6, "TAPE:ioop: %x\n", mt_op); | |
1260 | DBF_EVENT(6, "TAPE:arg: %x\n", mt_count); | |
1261 | ||
1262 | if (mt_op < 0 || mt_op >= TAPE_NR_MTOPS) | |
1263 | return -EINVAL; | |
1264 | fn = device->discipline->mtop_array[mt_op]; | |
1265 | if (fn == NULL) | |
1266 | return -EINVAL; | |
1267 | ||
1268 | /* We assume that the backends can handle count up to 500. */ | |
1269 | if (mt_op == MTBSR || mt_op == MTFSR || mt_op == MTFSF || | |
1270 | mt_op == MTBSF || mt_op == MTFSFM || mt_op == MTBSFM) { | |
1271 | rc = 0; | |
1272 | for (; mt_count > 500; mt_count -= 500) | |
1273 | if ((rc = fn(device, 500)) != 0) | |
1274 | break; | |
1275 | if (rc == 0) | |
1276 | rc = fn(device, mt_count); | |
1277 | } else | |
1278 | rc = fn(device, mt_count); | |
1279 | return rc; | |
1280 | ||
1281 | } | |
1282 | ||
1283 | /* | |
1284 | * Tape init function. | |
1285 | */ | |
1286 | static int | |
1287 | tape_init (void) | |
1288 | { | |
66a464db | 1289 | TAPE_DBF_AREA = debug_register ( "tape", 2, 2, 4*sizeof(long)); |
1da177e4 LT |
1290 | debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view); |
1291 | #ifdef DBF_LIKE_HELL | |
1292 | debug_set_level(TAPE_DBF_AREA, 6); | |
1293 | #endif | |
e018ba1f | 1294 | DBF_EVENT(3, "tape init\n"); |
1da177e4 LT |
1295 | tape_proc_init(); |
1296 | tapechar_init (); | |
1297 | tapeblock_init (); | |
1298 | return 0; | |
1299 | } | |
1300 | ||
1301 | /* | |
1302 | * Tape exit function. | |
1303 | */ | |
1304 | static void | |
1305 | tape_exit(void) | |
1306 | { | |
1307 | DBF_EVENT(6, "tape exit\n"); | |
1308 | ||
1309 | /* Get rid of the frontends */ | |
1310 | tapechar_exit(); | |
1311 | tapeblock_exit(); | |
1312 | tape_proc_cleanup(); | |
1313 | debug_unregister (TAPE_DBF_AREA); | |
1314 | } | |
1315 | ||
1316 | MODULE_AUTHOR("(C) 2001 IBM Deutschland Entwicklung GmbH by Carsten Otte and " | |
1317 | "Michael Holzheu (cotte@de.ibm.com,holzheu@de.ibm.com)"); | |
e018ba1f | 1318 | MODULE_DESCRIPTION("Linux on zSeries channel attached tape device driver"); |
1da177e4 LT |
1319 | MODULE_LICENSE("GPL"); |
1320 | ||
1321 | module_init(tape_init); | |
1322 | module_exit(tape_exit); | |
1323 | ||
1324 | EXPORT_SYMBOL(tape_generic_remove); | |
1325 | EXPORT_SYMBOL(tape_generic_probe); | |
1326 | EXPORT_SYMBOL(tape_generic_online); | |
1327 | EXPORT_SYMBOL(tape_generic_offline); | |
3ef32e62 | 1328 | EXPORT_SYMBOL(tape_generic_pm_suspend); |
1da177e4 | 1329 | EXPORT_SYMBOL(tape_put_device); |
8fd138c3 | 1330 | EXPORT_SYMBOL(tape_get_device); |
1da177e4 LT |
1331 | EXPORT_SYMBOL(tape_state_verbose); |
1332 | EXPORT_SYMBOL(tape_op_verbose); | |
1333 | EXPORT_SYMBOL(tape_state_set); | |
1334 | EXPORT_SYMBOL(tape_med_state_set); | |
1335 | EXPORT_SYMBOL(tape_alloc_request); | |
1336 | EXPORT_SYMBOL(tape_free_request); | |
1da177e4 LT |
1337 | EXPORT_SYMBOL(tape_dump_sense_dbf); |
1338 | EXPORT_SYMBOL(tape_do_io); | |
1339 | EXPORT_SYMBOL(tape_do_io_async); | |
1340 | EXPORT_SYMBOL(tape_do_io_interruptible); | |
5f384338 | 1341 | EXPORT_SYMBOL(tape_cancel_io); |
1da177e4 | 1342 | EXPORT_SYMBOL(tape_mtop); |