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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * standard tape device functions for ibm tapes. |
4 | * | |
5 | * S390 and zSeries version | |
a53c8fab | 6 | * Copyright IBM Corp. 2001, 2002 |
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> | |
11 | * Stefan Bader <shbader@de.ibm.com> | |
12 | */ | |
13 | ||
bb509912 MH |
14 | #define KMSG_COMPONENT "tape" |
15 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
16 | ||
1da177e4 LT |
17 | #include <linux/stddef.h> |
18 | #include <linux/kernel.h> | |
19 | #include <linux/bio.h> | |
20 | #include <linux/timer.h> | |
21 | ||
22 | #include <asm/types.h> | |
23 | #include <asm/idals.h> | |
24 | #include <asm/ebcdic.h> | |
25 | #include <asm/tape390.h> | |
26 | ||
27 | #define TAPE_DBF_AREA tape_core_dbf | |
28 | ||
29 | #include "tape.h" | |
30 | #include "tape_std.h" | |
31 | ||
1da177e4 LT |
32 | /* |
33 | * tape_std_assign | |
34 | */ | |
35 | static void | |
9c6c273a | 36 | tape_std_assign_timeout(struct timer_list *t) |
1da177e4 | 37 | { |
9c6c273a KC |
38 | struct tape_request * request = from_timer(request, t, timer); |
39 | struct tape_device * device = request->device; | |
5f384338 | 40 | int rc; |
1da177e4 | 41 | |
6aa0d3a9 | 42 | BUG_ON(!device); |
1da177e4 | 43 | |
5f384338 | 44 | DBF_EVENT(3, "%08x: Assignment timeout. Device busy.\n", |
1da177e4 | 45 | device->cdev_id); |
5f384338 MH |
46 | rc = tape_cancel_io(device, request); |
47 | if(rc) | |
f2166bb1 SO |
48 | DBF_EVENT(3, "(%08x): Assign timeout: Cancel failed with rc = " |
49 | "%i\n", device->cdev_id, rc); | |
1da177e4 LT |
50 | } |
51 | ||
52 | int | |
53 | tape_std_assign(struct tape_device *device) | |
54 | { | |
55 | int rc; | |
1da177e4 LT |
56 | struct tape_request *request; |
57 | ||
58 | request = tape_alloc_request(2, 11); | |
59 | if (IS_ERR(request)) | |
60 | return PTR_ERR(request); | |
61 | ||
62 | request->op = TO_ASSIGN; | |
63 | tape_ccw_cc(request->cpaddr, ASSIGN, 11, request->cpdata); | |
64 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); | |
65 | ||
66 | /* | |
67 | * The assign command sometimes blocks if the device is assigned | |
68 | * to another host (actually this shouldn't happen but it does). | |
69 | * So we set up a timeout for this call. | |
70 | */ | |
9c6c273a | 71 | timer_setup(&request->timer, tape_std_assign_timeout, 0); |
213fca9e | 72 | mod_timer(&request->timer, jiffies + msecs_to_jiffies(2000)); |
1da177e4 LT |
73 | |
74 | rc = tape_do_io_interruptible(device, request); | |
75 | ||
9c6c273a | 76 | del_timer_sync(&request->timer); |
1da177e4 LT |
77 | |
78 | if (rc != 0) { | |
1da177e4 LT |
79 | DBF_EVENT(3, "%08x: assign failed - device might be busy\n", |
80 | device->cdev_id); | |
81 | } else { | |
82 | DBF_EVENT(3, "%08x: Tape assigned\n", device->cdev_id); | |
83 | } | |
84 | tape_free_request(request); | |
85 | return rc; | |
86 | } | |
87 | ||
88 | /* | |
89 | * tape_std_unassign | |
90 | */ | |
91 | int | |
92 | tape_std_unassign (struct tape_device *device) | |
93 | { | |
94 | int rc; | |
95 | struct tape_request *request; | |
96 | ||
97 | if (device->tape_state == TS_NOT_OPER) { | |
98 | DBF_EVENT(3, "(%08x): Can't unassign device\n", | |
99 | device->cdev_id); | |
1da177e4 LT |
100 | return -EIO; |
101 | } | |
102 | ||
103 | request = tape_alloc_request(2, 11); | |
104 | if (IS_ERR(request)) | |
105 | return PTR_ERR(request); | |
106 | ||
107 | request->op = TO_UNASSIGN; | |
108 | tape_ccw_cc(request->cpaddr, UNASSIGN, 11, request->cpdata); | |
109 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); | |
110 | ||
111 | if ((rc = tape_do_io(device, request)) != 0) { | |
112 | DBF_EVENT(3, "%08x: Unassign failed\n", device->cdev_id); | |
1da177e4 LT |
113 | } else { |
114 | DBF_EVENT(3, "%08x: Tape unassigned\n", device->cdev_id); | |
115 | } | |
116 | tape_free_request(request); | |
117 | return rc; | |
118 | } | |
119 | ||
120 | /* | |
121 | * TAPE390_DISPLAY: Show a string on the tape display. | |
122 | */ | |
123 | int | |
124 | tape_std_display(struct tape_device *device, struct display_struct *disp) | |
125 | { | |
126 | struct tape_request *request; | |
127 | int rc; | |
128 | ||
129 | request = tape_alloc_request(2, 17); | |
130 | if (IS_ERR(request)) { | |
131 | DBF_EVENT(3, "TAPE: load display failed\n"); | |
132 | return PTR_ERR(request); | |
133 | } | |
134 | request->op = TO_DIS; | |
135 | ||
136 | *(unsigned char *) request->cpdata = disp->cntrl; | |
137 | DBF_EVENT(5, "TAPE: display cntrl=%04x\n", disp->cntrl); | |
138 | memcpy(((unsigned char *) request->cpdata) + 1, disp->message1, 8); | |
139 | memcpy(((unsigned char *) request->cpdata) + 9, disp->message2, 8); | |
140 | ASCEBC(((unsigned char*) request->cpdata) + 1, 16); | |
141 | ||
142 | tape_ccw_cc(request->cpaddr, LOAD_DISPLAY, 17, request->cpdata); | |
143 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); | |
144 | ||
145 | rc = tape_do_io_interruptible(device, request); | |
146 | tape_free_request(request); | |
147 | return rc; | |
148 | } | |
149 | ||
150 | /* | |
151 | * Read block id. | |
152 | */ | |
153 | int | |
154 | tape_std_read_block_id(struct tape_device *device, __u64 *id) | |
155 | { | |
156 | struct tape_request *request; | |
157 | int rc; | |
158 | ||
159 | request = tape_alloc_request(3, 8); | |
160 | if (IS_ERR(request)) | |
161 | return PTR_ERR(request); | |
162 | request->op = TO_RBI; | |
163 | /* setup ccws */ | |
164 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
165 | tape_ccw_cc(request->cpaddr + 1, READ_BLOCK_ID, 8, request->cpdata); | |
166 | tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); | |
167 | /* execute it */ | |
168 | rc = tape_do_io(device, request); | |
169 | if (rc == 0) | |
170 | /* Get result from read buffer. */ | |
171 | *id = *(__u64 *) request->cpdata; | |
172 | tape_free_request(request); | |
173 | return rc; | |
174 | } | |
175 | ||
176 | int | |
177 | tape_std_terminate_write(struct tape_device *device) | |
178 | { | |
179 | int rc; | |
180 | ||
181 | if(device->required_tapemarks == 0) | |
182 | return 0; | |
183 | ||
184 | DBF_LH(5, "tape%d: terminate write %dxEOF\n", device->first_minor, | |
185 | device->required_tapemarks); | |
186 | ||
187 | rc = tape_mtop(device, MTWEOF, device->required_tapemarks); | |
188 | if (rc) | |
189 | return rc; | |
190 | ||
191 | device->required_tapemarks = 0; | |
192 | return tape_mtop(device, MTBSR, 1); | |
193 | } | |
194 | ||
195 | /* | |
196 | * MTLOAD: Loads the tape. | |
197 | * The default implementation just wait until the tape medium state changes | |
198 | * to MS_LOADED. | |
199 | */ | |
200 | int | |
201 | tape_std_mtload(struct tape_device *device, int count) | |
202 | { | |
203 | return wait_event_interruptible(device->state_change_wq, | |
204 | (device->medium_state == MS_LOADED)); | |
205 | } | |
206 | ||
207 | /* | |
208 | * MTSETBLK: Set block size. | |
209 | */ | |
210 | int | |
211 | tape_std_mtsetblk(struct tape_device *device, int count) | |
212 | { | |
213 | struct idal_buffer *new; | |
214 | ||
215 | DBF_LH(6, "tape_std_mtsetblk(%d)\n", count); | |
216 | if (count <= 0) { | |
217 | /* | |
218 | * Just set block_size to 0. tapechar_read/tapechar_write | |
219 | * will realloc the idal buffer if a bigger one than the | |
220 | * current is needed. | |
221 | */ | |
222 | device->char_data.block_size = 0; | |
223 | return 0; | |
224 | } | |
225 | if (device->char_data.idal_buf != NULL && | |
226 | device->char_data.idal_buf->size == count) | |
227 | /* We already have a idal buffer of that size. */ | |
228 | return 0; | |
229 | ||
230 | if (count > MAX_BLOCKSIZE) { | |
231 | DBF_EVENT(3, "Invalid block size (%d > %d) given.\n", | |
232 | count, MAX_BLOCKSIZE); | |
1da177e4 LT |
233 | return -EINVAL; |
234 | } | |
235 | ||
236 | /* Allocate a new idal buffer. */ | |
237 | new = idal_buffer_alloc(count, 0); | |
0983e568 | 238 | if (IS_ERR(new)) |
1da177e4 LT |
239 | return -ENOMEM; |
240 | if (device->char_data.idal_buf != NULL) | |
241 | idal_buffer_free(device->char_data.idal_buf); | |
242 | device->char_data.idal_buf = new; | |
243 | device->char_data.block_size = count; | |
244 | ||
245 | DBF_LH(6, "new blocksize is %d\n", device->char_data.block_size); | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
250 | /* | |
251 | * MTRESET: Set block size to 0. | |
252 | */ | |
253 | int | |
254 | tape_std_mtreset(struct tape_device *device, int count) | |
255 | { | |
256 | DBF_EVENT(6, "TCHAR:devreset:\n"); | |
257 | device->char_data.block_size = 0; | |
258 | return 0; | |
259 | } | |
260 | ||
261 | /* | |
262 | * MTFSF: Forward space over 'count' file marks. The tape is positioned | |
263 | * at the EOT (End of Tape) side of the file mark. | |
264 | */ | |
265 | int | |
266 | tape_std_mtfsf(struct tape_device *device, int mt_count) | |
267 | { | |
268 | struct tape_request *request; | |
269 | struct ccw1 *ccw; | |
270 | ||
271 | request = tape_alloc_request(mt_count + 2, 0); | |
272 | if (IS_ERR(request)) | |
273 | return PTR_ERR(request); | |
274 | request->op = TO_FSF; | |
275 | /* setup ccws */ | |
276 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
277 | device->modeset_byte); | |
278 | ccw = tape_ccw_repeat(ccw, FORSPACEFILE, mt_count); | |
279 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
280 | ||
281 | /* execute it */ | |
282 | return tape_do_io_free(device, request); | |
283 | } | |
284 | ||
285 | /* | |
286 | * MTFSR: Forward space over 'count' tape blocks (blocksize is set | |
287 | * via MTSETBLK. | |
288 | */ | |
289 | int | |
290 | tape_std_mtfsr(struct tape_device *device, int mt_count) | |
291 | { | |
292 | struct tape_request *request; | |
293 | struct ccw1 *ccw; | |
294 | int rc; | |
295 | ||
296 | request = tape_alloc_request(mt_count + 2, 0); | |
297 | if (IS_ERR(request)) | |
298 | return PTR_ERR(request); | |
299 | request->op = TO_FSB; | |
300 | /* setup ccws */ | |
301 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
302 | device->modeset_byte); | |
303 | ccw = tape_ccw_repeat(ccw, FORSPACEBLOCK, mt_count); | |
304 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
305 | ||
306 | /* execute it */ | |
307 | rc = tape_do_io(device, request); | |
308 | if (rc == 0 && request->rescnt > 0) { | |
309 | DBF_LH(3, "FSR over tapemark\n"); | |
310 | rc = 1; | |
311 | } | |
312 | tape_free_request(request); | |
313 | ||
314 | return rc; | |
315 | } | |
316 | ||
317 | /* | |
318 | * MTBSR: Backward space over 'count' tape blocks. | |
319 | * (blocksize is set via MTSETBLK. | |
320 | */ | |
321 | int | |
322 | tape_std_mtbsr(struct tape_device *device, int mt_count) | |
323 | { | |
324 | struct tape_request *request; | |
325 | struct ccw1 *ccw; | |
326 | int rc; | |
327 | ||
328 | request = tape_alloc_request(mt_count + 2, 0); | |
329 | if (IS_ERR(request)) | |
330 | return PTR_ERR(request); | |
331 | request->op = TO_BSB; | |
332 | /* setup ccws */ | |
333 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
334 | device->modeset_byte); | |
335 | ccw = tape_ccw_repeat(ccw, BACKSPACEBLOCK, mt_count); | |
336 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
337 | ||
338 | /* execute it */ | |
339 | rc = tape_do_io(device, request); | |
340 | if (rc == 0 && request->rescnt > 0) { | |
341 | DBF_LH(3, "BSR over tapemark\n"); | |
342 | rc = 1; | |
343 | } | |
344 | tape_free_request(request); | |
345 | ||
346 | return rc; | |
347 | } | |
348 | ||
349 | /* | |
350 | * MTWEOF: Write 'count' file marks at the current position. | |
351 | */ | |
352 | int | |
353 | tape_std_mtweof(struct tape_device *device, int mt_count) | |
354 | { | |
355 | struct tape_request *request; | |
356 | struct ccw1 *ccw; | |
357 | ||
358 | request = tape_alloc_request(mt_count + 2, 0); | |
359 | if (IS_ERR(request)) | |
360 | return PTR_ERR(request); | |
361 | request->op = TO_WTM; | |
362 | /* setup ccws */ | |
363 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
364 | device->modeset_byte); | |
365 | ccw = tape_ccw_repeat(ccw, WRITETAPEMARK, mt_count); | |
366 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
367 | ||
368 | /* execute it */ | |
369 | return tape_do_io_free(device, request); | |
370 | } | |
371 | ||
372 | /* | |
373 | * MTBSFM: Backward space over 'count' file marks. | |
374 | * The tape is positioned at the BOT (Begin Of Tape) side of the | |
375 | * last skipped file mark. | |
376 | */ | |
377 | int | |
378 | tape_std_mtbsfm(struct tape_device *device, int mt_count) | |
379 | { | |
380 | struct tape_request *request; | |
381 | struct ccw1 *ccw; | |
382 | ||
383 | request = tape_alloc_request(mt_count + 2, 0); | |
384 | if (IS_ERR(request)) | |
385 | return PTR_ERR(request); | |
386 | request->op = TO_BSF; | |
387 | /* setup ccws */ | |
388 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
389 | device->modeset_byte); | |
390 | ccw = tape_ccw_repeat(ccw, BACKSPACEFILE, mt_count); | |
391 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
392 | ||
393 | /* execute it */ | |
394 | return tape_do_io_free(device, request); | |
395 | } | |
396 | ||
397 | /* | |
398 | * MTBSF: Backward space over 'count' file marks. The tape is positioned at | |
399 | * the EOT (End of Tape) side of the last skipped file mark. | |
400 | */ | |
401 | int | |
402 | tape_std_mtbsf(struct tape_device *device, int mt_count) | |
403 | { | |
404 | struct tape_request *request; | |
405 | struct ccw1 *ccw; | |
406 | int rc; | |
407 | ||
408 | request = tape_alloc_request(mt_count + 2, 0); | |
409 | if (IS_ERR(request)) | |
410 | return PTR_ERR(request); | |
411 | request->op = TO_BSF; | |
412 | /* setup ccws */ | |
413 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
414 | device->modeset_byte); | |
415 | ccw = tape_ccw_repeat(ccw, BACKSPACEFILE, mt_count); | |
416 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
417 | /* execute it */ | |
418 | rc = tape_do_io_free(device, request); | |
419 | if (rc == 0) { | |
420 | rc = tape_mtop(device, MTFSR, 1); | |
421 | if (rc > 0) | |
422 | rc = 0; | |
423 | } | |
424 | return rc; | |
425 | } | |
426 | ||
427 | /* | |
428 | * MTFSFM: Forward space over 'count' file marks. | |
429 | * The tape is positioned at the BOT (Begin Of Tape) side | |
430 | * of the last skipped file mark. | |
431 | */ | |
432 | int | |
433 | tape_std_mtfsfm(struct tape_device *device, int mt_count) | |
434 | { | |
435 | struct tape_request *request; | |
436 | struct ccw1 *ccw; | |
437 | int rc; | |
438 | ||
439 | request = tape_alloc_request(mt_count + 2, 0); | |
440 | if (IS_ERR(request)) | |
441 | return PTR_ERR(request); | |
442 | request->op = TO_FSF; | |
443 | /* setup ccws */ | |
444 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
445 | device->modeset_byte); | |
446 | ccw = tape_ccw_repeat(ccw, FORSPACEFILE, mt_count); | |
447 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
448 | /* execute it */ | |
449 | rc = tape_do_io_free(device, request); | |
450 | if (rc == 0) { | |
451 | rc = tape_mtop(device, MTBSR, 1); | |
452 | if (rc > 0) | |
453 | rc = 0; | |
454 | } | |
455 | ||
456 | return rc; | |
457 | } | |
458 | ||
459 | /* | |
460 | * MTREW: Rewind the tape. | |
461 | */ | |
462 | int | |
463 | tape_std_mtrew(struct tape_device *device, int mt_count) | |
464 | { | |
465 | struct tape_request *request; | |
466 | ||
467 | request = tape_alloc_request(3, 0); | |
468 | if (IS_ERR(request)) | |
469 | return PTR_ERR(request); | |
470 | request->op = TO_REW; | |
471 | /* setup ccws */ | |
472 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
473 | device->modeset_byte); | |
474 | tape_ccw_cc(request->cpaddr + 1, REWIND, 0, NULL); | |
475 | tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); | |
476 | ||
477 | /* execute it */ | |
478 | return tape_do_io_free(device, request); | |
479 | } | |
480 | ||
481 | /* | |
482 | * MTOFFL: Rewind the tape and put the drive off-line. | |
483 | * Implement 'rewind unload' | |
484 | */ | |
485 | int | |
486 | tape_std_mtoffl(struct tape_device *device, int mt_count) | |
487 | { | |
488 | struct tape_request *request; | |
489 | ||
490 | request = tape_alloc_request(3, 0); | |
491 | if (IS_ERR(request)) | |
492 | return PTR_ERR(request); | |
493 | request->op = TO_RUN; | |
494 | /* setup ccws */ | |
495 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
496 | tape_ccw_cc(request->cpaddr + 1, REWIND_UNLOAD, 0, NULL); | |
497 | tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); | |
498 | ||
499 | /* execute it */ | |
500 | return tape_do_io_free(device, request); | |
501 | } | |
502 | ||
503 | /* | |
504 | * MTNOP: 'No operation'. | |
505 | */ | |
506 | int | |
507 | tape_std_mtnop(struct tape_device *device, int mt_count) | |
508 | { | |
509 | struct tape_request *request; | |
510 | ||
511 | request = tape_alloc_request(2, 0); | |
512 | if (IS_ERR(request)) | |
513 | return PTR_ERR(request); | |
514 | request->op = TO_NOP; | |
515 | /* setup ccws */ | |
516 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
517 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); | |
518 | /* execute it */ | |
519 | return tape_do_io_free(device, request); | |
520 | } | |
521 | ||
522 | /* | |
523 | * MTEOM: positions at the end of the portion of the tape already used | |
524 | * for recordind data. MTEOM positions after the last file mark, ready for | |
525 | * appending another file. | |
526 | */ | |
527 | int | |
528 | tape_std_mteom(struct tape_device *device, int mt_count) | |
529 | { | |
530 | int rc; | |
531 | ||
532 | /* | |
533 | * Seek from the beginning of tape (rewind). | |
534 | */ | |
535 | if ((rc = tape_mtop(device, MTREW, 1)) < 0) | |
536 | return rc; | |
537 | ||
538 | /* | |
539 | * The logical end of volume is given by two sewuential tapemarks. | |
540 | * Look for this by skipping to the next file (over one tapemark) | |
541 | * and then test for another one (fsr returns 1 if a tapemark was | |
542 | * encountered). | |
543 | */ | |
544 | do { | |
545 | if ((rc = tape_mtop(device, MTFSF, 1)) < 0) | |
546 | return rc; | |
547 | if ((rc = tape_mtop(device, MTFSR, 1)) < 0) | |
548 | return rc; | |
549 | } while (rc == 0); | |
550 | ||
551 | return tape_mtop(device, MTBSR, 1); | |
552 | } | |
553 | ||
554 | /* | |
555 | * MTRETEN: Retension the tape, i.e. forward space to end of tape and rewind. | |
556 | */ | |
557 | int | |
558 | tape_std_mtreten(struct tape_device *device, int mt_count) | |
559 | { | |
560 | struct tape_request *request; | |
1da177e4 LT |
561 | |
562 | request = tape_alloc_request(4, 0); | |
563 | if (IS_ERR(request)) | |
564 | return PTR_ERR(request); | |
565 | request->op = TO_FSF; | |
566 | /* setup ccws */ | |
567 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
568 | tape_ccw_cc(request->cpaddr + 1,FORSPACEFILE, 0, NULL); | |
569 | tape_ccw_cc(request->cpaddr + 2, NOP, 0, NULL); | |
570 | tape_ccw_end(request->cpaddr + 3, CCW_CMD_TIC, 0, request->cpaddr); | |
571 | /* execute it, MTRETEN rc gets ignored */ | |
160fbf2e | 572 | tape_do_io_interruptible(device, request); |
1da177e4 LT |
573 | tape_free_request(request); |
574 | return tape_mtop(device, MTREW, 1); | |
575 | } | |
576 | ||
577 | /* | |
578 | * MTERASE: erases the tape. | |
579 | */ | |
580 | int | |
581 | tape_std_mterase(struct tape_device *device, int mt_count) | |
582 | { | |
583 | struct tape_request *request; | |
584 | ||
585 | request = tape_alloc_request(6, 0); | |
586 | if (IS_ERR(request)) | |
587 | return PTR_ERR(request); | |
588 | request->op = TO_DSE; | |
589 | /* setup ccws */ | |
590 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
591 | tape_ccw_cc(request->cpaddr + 1, REWIND, 0, NULL); | |
592 | tape_ccw_cc(request->cpaddr + 2, ERASE_GAP, 0, NULL); | |
593 | tape_ccw_cc(request->cpaddr + 3, DATA_SEC_ERASE, 0, NULL); | |
594 | tape_ccw_cc(request->cpaddr + 4, REWIND, 0, NULL); | |
595 | tape_ccw_end(request->cpaddr + 5, NOP, 0, NULL); | |
596 | ||
597 | /* execute it */ | |
598 | return tape_do_io_free(device, request); | |
599 | } | |
600 | ||
601 | /* | |
602 | * MTUNLOAD: Rewind the tape and unload it. | |
603 | */ | |
604 | int | |
605 | tape_std_mtunload(struct tape_device *device, int mt_count) | |
606 | { | |
607 | return tape_mtop(device, MTOFFL, mt_count); | |
608 | } | |
609 | ||
610 | /* | |
611 | * MTCOMPRESSION: used to enable compression. | |
612 | * Sets the IDRC on/off. | |
613 | */ | |
614 | int | |
615 | tape_std_mtcompression(struct tape_device *device, int mt_count) | |
616 | { | |
617 | struct tape_request *request; | |
618 | ||
619 | if (mt_count < 0 || mt_count > 1) { | |
620 | DBF_EXCEPTION(6, "xcom parm\n"); | |
1da177e4 LT |
621 | return -EINVAL; |
622 | } | |
623 | request = tape_alloc_request(2, 0); | |
624 | if (IS_ERR(request)) | |
625 | return PTR_ERR(request); | |
626 | request->op = TO_NOP; | |
627 | /* setup ccws */ | |
4925c7e2 MH |
628 | if (mt_count == 0) |
629 | *device->modeset_byte &= ~0x08; | |
630 | else | |
631 | *device->modeset_byte |= 0x08; | |
1da177e4 LT |
632 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); |
633 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); | |
634 | /* execute it */ | |
635 | return tape_do_io_free(device, request); | |
636 | } | |
637 | ||
638 | /* | |
639 | * Read Block | |
640 | */ | |
641 | struct tape_request * | |
642 | tape_std_read_block(struct tape_device *device, size_t count) | |
643 | { | |
644 | struct tape_request *request; | |
645 | ||
646 | /* | |
647 | * We have to alloc 4 ccws in order to be able to transform request | |
648 | * into a read backward request in error case. | |
649 | */ | |
650 | request = tape_alloc_request(4, 0); | |
651 | if (IS_ERR(request)) { | |
652 | DBF_EXCEPTION(6, "xrbl fail"); | |
653 | return request; | |
654 | } | |
655 | request->op = TO_RFO; | |
656 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
657 | tape_ccw_end_idal(request->cpaddr + 1, READ_FORWARD, | |
658 | device->char_data.idal_buf); | |
659 | DBF_EVENT(6, "xrbl ccwg\n"); | |
660 | return request; | |
661 | } | |
662 | ||
663 | /* | |
664 | * Read Block backward transformation function. | |
665 | */ | |
666 | void | |
667 | tape_std_read_backward(struct tape_device *device, struct tape_request *request) | |
668 | { | |
669 | /* | |
670 | * We have allocated 4 ccws in tape_std_read, so we can now | |
671 | * transform the request to a read backward, followed by a | |
672 | * forward space block. | |
673 | */ | |
674 | request->op = TO_RBA; | |
675 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
676 | tape_ccw_cc_idal(request->cpaddr + 1, READ_BACKWARD, | |
677 | device->char_data.idal_buf); | |
678 | tape_ccw_cc(request->cpaddr + 2, FORSPACEBLOCK, 0, NULL); | |
679 | tape_ccw_end(request->cpaddr + 3, NOP, 0, NULL); | |
680 | DBF_EVENT(6, "xrop ccwg");} | |
681 | ||
682 | /* | |
683 | * Write Block | |
684 | */ | |
685 | struct tape_request * | |
686 | tape_std_write_block(struct tape_device *device, size_t count) | |
687 | { | |
688 | struct tape_request *request; | |
689 | ||
690 | request = tape_alloc_request(2, 0); | |
691 | if (IS_ERR(request)) { | |
692 | DBF_EXCEPTION(6, "xwbl fail\n"); | |
693 | return request; | |
694 | } | |
695 | request->op = TO_WRI; | |
696 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
697 | tape_ccw_end_idal(request->cpaddr + 1, WRITE_CMD, | |
698 | device->char_data.idal_buf); | |
699 | DBF_EVENT(6, "xwbl ccwg\n"); | |
700 | return request; | |
701 | } | |
702 | ||
703 | /* | |
704 | * This routine is called by frontend after an ENOSP on write | |
705 | */ | |
706 | void | |
707 | tape_std_process_eov(struct tape_device *device) | |
708 | { | |
709 | /* | |
710 | * End of volume: We have to backspace the last written record, then | |
711 | * we TRY to write a tapemark and then backspace over the written TM | |
712 | */ | |
713 | if (tape_mtop(device, MTBSR, 1) == 0 && | |
714 | tape_mtop(device, MTWEOF, 1) == 0) { | |
715 | tape_mtop(device, MTBSR, 1); | |
716 | } | |
717 | } | |
718 | ||
719 | EXPORT_SYMBOL(tape_std_assign); | |
720 | EXPORT_SYMBOL(tape_std_unassign); | |
721 | EXPORT_SYMBOL(tape_std_display); | |
722 | EXPORT_SYMBOL(tape_std_read_block_id); | |
723 | EXPORT_SYMBOL(tape_std_mtload); | |
724 | EXPORT_SYMBOL(tape_std_mtsetblk); | |
725 | EXPORT_SYMBOL(tape_std_mtreset); | |
726 | EXPORT_SYMBOL(tape_std_mtfsf); | |
727 | EXPORT_SYMBOL(tape_std_mtfsr); | |
728 | EXPORT_SYMBOL(tape_std_mtbsr); | |
729 | EXPORT_SYMBOL(tape_std_mtweof); | |
730 | EXPORT_SYMBOL(tape_std_mtbsfm); | |
731 | EXPORT_SYMBOL(tape_std_mtbsf); | |
732 | EXPORT_SYMBOL(tape_std_mtfsfm); | |
733 | EXPORT_SYMBOL(tape_std_mtrew); | |
734 | EXPORT_SYMBOL(tape_std_mtoffl); | |
735 | EXPORT_SYMBOL(tape_std_mtnop); | |
736 | EXPORT_SYMBOL(tape_std_mteom); | |
737 | EXPORT_SYMBOL(tape_std_mtreten); | |
738 | EXPORT_SYMBOL(tape_std_mterase); | |
739 | EXPORT_SYMBOL(tape_std_mtunload); | |
740 | EXPORT_SYMBOL(tape_std_mtcompression); | |
741 | EXPORT_SYMBOL(tape_std_read_block); | |
742 | EXPORT_SYMBOL(tape_std_read_backward); | |
743 | EXPORT_SYMBOL(tape_std_write_block); | |
744 | EXPORT_SYMBOL(tape_std_process_eov); |