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