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1da177e4 LT |
1 | /* |
2 | * drivers/s390/char/tape_std.c | |
3 | * standard tape device functions for ibm tapes. | |
4 | * | |
5 | * S390 and zSeries version | |
6 | * Copyright (C) 2001,2002 IBM Deutschland Entwicklung GmbH, IBM Corporation | |
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 | |
36 | tape_std_assign_timeout(unsigned long data) | |
37 | { | |
38 | struct tape_request * request; | |
39 | struct tape_device * device; | |
5f384338 | 40 | int rc; |
1da177e4 LT |
41 | |
42 | request = (struct tape_request *) data; | |
6aa0d3a9 SG |
43 | device = request->device; |
44 | BUG_ON(!device); | |
1da177e4 | 45 | |
5f384338 | 46 | DBF_EVENT(3, "%08x: Assignment timeout. Device busy.\n", |
1da177e4 | 47 | device->cdev_id); |
5f384338 MH |
48 | rc = tape_cancel_io(device, request); |
49 | if(rc) | |
ab640db0 | 50 | DBF_EVENT(3, "(%s): Assign timeout: Cancel failed with rc = %i\n", |
2a0217d5 | 51 | dev_name(&device->cdev->dev), rc); |
1da177e4 LT |
52 | } |
53 | ||
54 | int | |
55 | tape_std_assign(struct tape_device *device) | |
56 | { | |
57 | int rc; | |
58 | struct timer_list timeout; | |
59 | struct tape_request *request; | |
60 | ||
61 | request = tape_alloc_request(2, 11); | |
62 | if (IS_ERR(request)) | |
63 | return PTR_ERR(request); | |
64 | ||
65 | request->op = TO_ASSIGN; | |
66 | tape_ccw_cc(request->cpaddr, ASSIGN, 11, request->cpdata); | |
67 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); | |
68 | ||
69 | /* | |
70 | * The assign command sometimes blocks if the device is assigned | |
71 | * to another host (actually this shouldn't happen but it does). | |
72 | * So we set up a timeout for this call. | |
73 | */ | |
6292b9ef | 74 | init_timer_on_stack(&timeout); |
1da177e4 LT |
75 | timeout.function = tape_std_assign_timeout; |
76 | timeout.data = (unsigned long) request; | |
77 | timeout.expires = jiffies + 2 * HZ; | |
78 | add_timer(&timeout); | |
79 | ||
80 | rc = tape_do_io_interruptible(device, request); | |
81 | ||
82 | del_timer(&timeout); | |
83 | ||
84 | if (rc != 0) { | |
1da177e4 LT |
85 | DBF_EVENT(3, "%08x: assign failed - device might be busy\n", |
86 | device->cdev_id); | |
87 | } else { | |
88 | DBF_EVENT(3, "%08x: Tape assigned\n", device->cdev_id); | |
89 | } | |
90 | tape_free_request(request); | |
91 | return rc; | |
92 | } | |
93 | ||
94 | /* | |
95 | * tape_std_unassign | |
96 | */ | |
97 | int | |
98 | tape_std_unassign (struct tape_device *device) | |
99 | { | |
100 | int rc; | |
101 | struct tape_request *request; | |
102 | ||
103 | if (device->tape_state == TS_NOT_OPER) { | |
104 | DBF_EVENT(3, "(%08x): Can't unassign device\n", | |
105 | device->cdev_id); | |
1da177e4 LT |
106 | return -EIO; |
107 | } | |
108 | ||
109 | request = tape_alloc_request(2, 11); | |
110 | if (IS_ERR(request)) | |
111 | return PTR_ERR(request); | |
112 | ||
113 | request->op = TO_UNASSIGN; | |
114 | tape_ccw_cc(request->cpaddr, UNASSIGN, 11, request->cpdata); | |
115 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); | |
116 | ||
117 | if ((rc = tape_do_io(device, request)) != 0) { | |
118 | DBF_EVENT(3, "%08x: Unassign failed\n", device->cdev_id); | |
1da177e4 LT |
119 | } else { |
120 | DBF_EVENT(3, "%08x: Tape unassigned\n", device->cdev_id); | |
121 | } | |
122 | tape_free_request(request); | |
123 | return rc; | |
124 | } | |
125 | ||
126 | /* | |
127 | * TAPE390_DISPLAY: Show a string on the tape display. | |
128 | */ | |
129 | int | |
130 | tape_std_display(struct tape_device *device, struct display_struct *disp) | |
131 | { | |
132 | struct tape_request *request; | |
133 | int rc; | |
134 | ||
135 | request = tape_alloc_request(2, 17); | |
136 | if (IS_ERR(request)) { | |
137 | DBF_EVENT(3, "TAPE: load display failed\n"); | |
138 | return PTR_ERR(request); | |
139 | } | |
140 | request->op = TO_DIS; | |
141 | ||
142 | *(unsigned char *) request->cpdata = disp->cntrl; | |
143 | DBF_EVENT(5, "TAPE: display cntrl=%04x\n", disp->cntrl); | |
144 | memcpy(((unsigned char *) request->cpdata) + 1, disp->message1, 8); | |
145 | memcpy(((unsigned char *) request->cpdata) + 9, disp->message2, 8); | |
146 | ASCEBC(((unsigned char*) request->cpdata) + 1, 16); | |
147 | ||
148 | tape_ccw_cc(request->cpaddr, LOAD_DISPLAY, 17, request->cpdata); | |
149 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); | |
150 | ||
151 | rc = tape_do_io_interruptible(device, request); | |
152 | tape_free_request(request); | |
153 | return rc; | |
154 | } | |
155 | ||
156 | /* | |
157 | * Read block id. | |
158 | */ | |
159 | int | |
160 | tape_std_read_block_id(struct tape_device *device, __u64 *id) | |
161 | { | |
162 | struct tape_request *request; | |
163 | int rc; | |
164 | ||
165 | request = tape_alloc_request(3, 8); | |
166 | if (IS_ERR(request)) | |
167 | return PTR_ERR(request); | |
168 | request->op = TO_RBI; | |
169 | /* setup ccws */ | |
170 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
171 | tape_ccw_cc(request->cpaddr + 1, READ_BLOCK_ID, 8, request->cpdata); | |
172 | tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); | |
173 | /* execute it */ | |
174 | rc = tape_do_io(device, request); | |
175 | if (rc == 0) | |
176 | /* Get result from read buffer. */ | |
177 | *id = *(__u64 *) request->cpdata; | |
178 | tape_free_request(request); | |
179 | return rc; | |
180 | } | |
181 | ||
182 | int | |
183 | tape_std_terminate_write(struct tape_device *device) | |
184 | { | |
185 | int rc; | |
186 | ||
187 | if(device->required_tapemarks == 0) | |
188 | return 0; | |
189 | ||
190 | DBF_LH(5, "tape%d: terminate write %dxEOF\n", device->first_minor, | |
191 | device->required_tapemarks); | |
192 | ||
193 | rc = tape_mtop(device, MTWEOF, device->required_tapemarks); | |
194 | if (rc) | |
195 | return rc; | |
196 | ||
197 | device->required_tapemarks = 0; | |
198 | return tape_mtop(device, MTBSR, 1); | |
199 | } | |
200 | ||
201 | /* | |
202 | * MTLOAD: Loads the tape. | |
203 | * The default implementation just wait until the tape medium state changes | |
204 | * to MS_LOADED. | |
205 | */ | |
206 | int | |
207 | tape_std_mtload(struct tape_device *device, int count) | |
208 | { | |
209 | return wait_event_interruptible(device->state_change_wq, | |
210 | (device->medium_state == MS_LOADED)); | |
211 | } | |
212 | ||
213 | /* | |
214 | * MTSETBLK: Set block size. | |
215 | */ | |
216 | int | |
217 | tape_std_mtsetblk(struct tape_device *device, int count) | |
218 | { | |
219 | struct idal_buffer *new; | |
220 | ||
221 | DBF_LH(6, "tape_std_mtsetblk(%d)\n", count); | |
222 | if (count <= 0) { | |
223 | /* | |
224 | * Just set block_size to 0. tapechar_read/tapechar_write | |
225 | * will realloc the idal buffer if a bigger one than the | |
226 | * current is needed. | |
227 | */ | |
228 | device->char_data.block_size = 0; | |
229 | return 0; | |
230 | } | |
231 | if (device->char_data.idal_buf != NULL && | |
232 | device->char_data.idal_buf->size == count) | |
233 | /* We already have a idal buffer of that size. */ | |
234 | return 0; | |
235 | ||
236 | if (count > MAX_BLOCKSIZE) { | |
237 | DBF_EVENT(3, "Invalid block size (%d > %d) given.\n", | |
238 | count, MAX_BLOCKSIZE); | |
1da177e4 LT |
239 | return -EINVAL; |
240 | } | |
241 | ||
242 | /* Allocate a new idal buffer. */ | |
243 | new = idal_buffer_alloc(count, 0); | |
0983e568 | 244 | if (IS_ERR(new)) |
1da177e4 LT |
245 | return -ENOMEM; |
246 | if (device->char_data.idal_buf != NULL) | |
247 | idal_buffer_free(device->char_data.idal_buf); | |
248 | device->char_data.idal_buf = new; | |
249 | device->char_data.block_size = count; | |
250 | ||
251 | DBF_LH(6, "new blocksize is %d\n", device->char_data.block_size); | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
256 | /* | |
257 | * MTRESET: Set block size to 0. | |
258 | */ | |
259 | int | |
260 | tape_std_mtreset(struct tape_device *device, int count) | |
261 | { | |
262 | DBF_EVENT(6, "TCHAR:devreset:\n"); | |
263 | device->char_data.block_size = 0; | |
264 | return 0; | |
265 | } | |
266 | ||
267 | /* | |
268 | * MTFSF: Forward space over 'count' file marks. The tape is positioned | |
269 | * at the EOT (End of Tape) side of the file mark. | |
270 | */ | |
271 | int | |
272 | tape_std_mtfsf(struct tape_device *device, int mt_count) | |
273 | { | |
274 | struct tape_request *request; | |
275 | struct ccw1 *ccw; | |
276 | ||
277 | request = tape_alloc_request(mt_count + 2, 0); | |
278 | if (IS_ERR(request)) | |
279 | return PTR_ERR(request); | |
280 | request->op = TO_FSF; | |
281 | /* setup ccws */ | |
282 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
283 | device->modeset_byte); | |
284 | ccw = tape_ccw_repeat(ccw, FORSPACEFILE, mt_count); | |
285 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
286 | ||
287 | /* execute it */ | |
288 | return tape_do_io_free(device, request); | |
289 | } | |
290 | ||
291 | /* | |
292 | * MTFSR: Forward space over 'count' tape blocks (blocksize is set | |
293 | * via MTSETBLK. | |
294 | */ | |
295 | int | |
296 | tape_std_mtfsr(struct tape_device *device, int mt_count) | |
297 | { | |
298 | struct tape_request *request; | |
299 | struct ccw1 *ccw; | |
300 | int rc; | |
301 | ||
302 | request = tape_alloc_request(mt_count + 2, 0); | |
303 | if (IS_ERR(request)) | |
304 | return PTR_ERR(request); | |
305 | request->op = TO_FSB; | |
306 | /* setup ccws */ | |
307 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
308 | device->modeset_byte); | |
309 | ccw = tape_ccw_repeat(ccw, FORSPACEBLOCK, mt_count); | |
310 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
311 | ||
312 | /* execute it */ | |
313 | rc = tape_do_io(device, request); | |
314 | if (rc == 0 && request->rescnt > 0) { | |
315 | DBF_LH(3, "FSR over tapemark\n"); | |
316 | rc = 1; | |
317 | } | |
318 | tape_free_request(request); | |
319 | ||
320 | return rc; | |
321 | } | |
322 | ||
323 | /* | |
324 | * MTBSR: Backward space over 'count' tape blocks. | |
325 | * (blocksize is set via MTSETBLK. | |
326 | */ | |
327 | int | |
328 | tape_std_mtbsr(struct tape_device *device, int mt_count) | |
329 | { | |
330 | struct tape_request *request; | |
331 | struct ccw1 *ccw; | |
332 | int rc; | |
333 | ||
334 | request = tape_alloc_request(mt_count + 2, 0); | |
335 | if (IS_ERR(request)) | |
336 | return PTR_ERR(request); | |
337 | request->op = TO_BSB; | |
338 | /* setup ccws */ | |
339 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
340 | device->modeset_byte); | |
341 | ccw = tape_ccw_repeat(ccw, BACKSPACEBLOCK, mt_count); | |
342 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
343 | ||
344 | /* execute it */ | |
345 | rc = tape_do_io(device, request); | |
346 | if (rc == 0 && request->rescnt > 0) { | |
347 | DBF_LH(3, "BSR over tapemark\n"); | |
348 | rc = 1; | |
349 | } | |
350 | tape_free_request(request); | |
351 | ||
352 | return rc; | |
353 | } | |
354 | ||
355 | /* | |
356 | * MTWEOF: Write 'count' file marks at the current position. | |
357 | */ | |
358 | int | |
359 | tape_std_mtweof(struct tape_device *device, int mt_count) | |
360 | { | |
361 | struct tape_request *request; | |
362 | struct ccw1 *ccw; | |
363 | ||
364 | request = tape_alloc_request(mt_count + 2, 0); | |
365 | if (IS_ERR(request)) | |
366 | return PTR_ERR(request); | |
367 | request->op = TO_WTM; | |
368 | /* setup ccws */ | |
369 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
370 | device->modeset_byte); | |
371 | ccw = tape_ccw_repeat(ccw, WRITETAPEMARK, mt_count); | |
372 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
373 | ||
374 | /* execute it */ | |
375 | return tape_do_io_free(device, request); | |
376 | } | |
377 | ||
378 | /* | |
379 | * MTBSFM: Backward space over 'count' file marks. | |
380 | * The tape is positioned at the BOT (Begin Of Tape) side of the | |
381 | * last skipped file mark. | |
382 | */ | |
383 | int | |
384 | tape_std_mtbsfm(struct tape_device *device, int mt_count) | |
385 | { | |
386 | struct tape_request *request; | |
387 | struct ccw1 *ccw; | |
388 | ||
389 | request = tape_alloc_request(mt_count + 2, 0); | |
390 | if (IS_ERR(request)) | |
391 | return PTR_ERR(request); | |
392 | request->op = TO_BSF; | |
393 | /* setup ccws */ | |
394 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
395 | device->modeset_byte); | |
396 | ccw = tape_ccw_repeat(ccw, BACKSPACEFILE, mt_count); | |
397 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
398 | ||
399 | /* execute it */ | |
400 | return tape_do_io_free(device, request); | |
401 | } | |
402 | ||
403 | /* | |
404 | * MTBSF: Backward space over 'count' file marks. The tape is positioned at | |
405 | * the EOT (End of Tape) side of the last skipped file mark. | |
406 | */ | |
407 | int | |
408 | tape_std_mtbsf(struct tape_device *device, int mt_count) | |
409 | { | |
410 | struct tape_request *request; | |
411 | struct ccw1 *ccw; | |
412 | int rc; | |
413 | ||
414 | request = tape_alloc_request(mt_count + 2, 0); | |
415 | if (IS_ERR(request)) | |
416 | return PTR_ERR(request); | |
417 | request->op = TO_BSF; | |
418 | /* setup ccws */ | |
419 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
420 | device->modeset_byte); | |
421 | ccw = tape_ccw_repeat(ccw, BACKSPACEFILE, mt_count); | |
422 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
423 | /* execute it */ | |
424 | rc = tape_do_io_free(device, request); | |
425 | if (rc == 0) { | |
426 | rc = tape_mtop(device, MTFSR, 1); | |
427 | if (rc > 0) | |
428 | rc = 0; | |
429 | } | |
430 | return rc; | |
431 | } | |
432 | ||
433 | /* | |
434 | * MTFSFM: Forward space over 'count' file marks. | |
435 | * The tape is positioned at the BOT (Begin Of Tape) side | |
436 | * of the last skipped file mark. | |
437 | */ | |
438 | int | |
439 | tape_std_mtfsfm(struct tape_device *device, int mt_count) | |
440 | { | |
441 | struct tape_request *request; | |
442 | struct ccw1 *ccw; | |
443 | int rc; | |
444 | ||
445 | request = tape_alloc_request(mt_count + 2, 0); | |
446 | if (IS_ERR(request)) | |
447 | return PTR_ERR(request); | |
448 | request->op = TO_FSF; | |
449 | /* setup ccws */ | |
450 | ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
451 | device->modeset_byte); | |
452 | ccw = tape_ccw_repeat(ccw, FORSPACEFILE, mt_count); | |
453 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
454 | /* execute it */ | |
455 | rc = tape_do_io_free(device, request); | |
456 | if (rc == 0) { | |
457 | rc = tape_mtop(device, MTBSR, 1); | |
458 | if (rc > 0) | |
459 | rc = 0; | |
460 | } | |
461 | ||
462 | return rc; | |
463 | } | |
464 | ||
465 | /* | |
466 | * MTREW: Rewind the tape. | |
467 | */ | |
468 | int | |
469 | tape_std_mtrew(struct tape_device *device, int mt_count) | |
470 | { | |
471 | struct tape_request *request; | |
472 | ||
473 | request = tape_alloc_request(3, 0); | |
474 | if (IS_ERR(request)) | |
475 | return PTR_ERR(request); | |
476 | request->op = TO_REW; | |
477 | /* setup ccws */ | |
478 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, | |
479 | device->modeset_byte); | |
480 | tape_ccw_cc(request->cpaddr + 1, REWIND, 0, NULL); | |
481 | tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); | |
482 | ||
483 | /* execute it */ | |
484 | return tape_do_io_free(device, request); | |
485 | } | |
486 | ||
487 | /* | |
488 | * MTOFFL: Rewind the tape and put the drive off-line. | |
489 | * Implement 'rewind unload' | |
490 | */ | |
491 | int | |
492 | tape_std_mtoffl(struct tape_device *device, int mt_count) | |
493 | { | |
494 | struct tape_request *request; | |
495 | ||
496 | request = tape_alloc_request(3, 0); | |
497 | if (IS_ERR(request)) | |
498 | return PTR_ERR(request); | |
499 | request->op = TO_RUN; | |
500 | /* setup ccws */ | |
501 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
502 | tape_ccw_cc(request->cpaddr + 1, REWIND_UNLOAD, 0, NULL); | |
503 | tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); | |
504 | ||
505 | /* execute it */ | |
506 | return tape_do_io_free(device, request); | |
507 | } | |
508 | ||
509 | /* | |
510 | * MTNOP: 'No operation'. | |
511 | */ | |
512 | int | |
513 | tape_std_mtnop(struct tape_device *device, int mt_count) | |
514 | { | |
515 | struct tape_request *request; | |
516 | ||
517 | request = tape_alloc_request(2, 0); | |
518 | if (IS_ERR(request)) | |
519 | return PTR_ERR(request); | |
520 | request->op = TO_NOP; | |
521 | /* setup ccws */ | |
522 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
523 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); | |
524 | /* execute it */ | |
525 | return tape_do_io_free(device, request); | |
526 | } | |
527 | ||
528 | /* | |
529 | * MTEOM: positions at the end of the portion of the tape already used | |
530 | * for recordind data. MTEOM positions after the last file mark, ready for | |
531 | * appending another file. | |
532 | */ | |
533 | int | |
534 | tape_std_mteom(struct tape_device *device, int mt_count) | |
535 | { | |
536 | int rc; | |
537 | ||
538 | /* | |
539 | * Seek from the beginning of tape (rewind). | |
540 | */ | |
541 | if ((rc = tape_mtop(device, MTREW, 1)) < 0) | |
542 | return rc; | |
543 | ||
544 | /* | |
545 | * The logical end of volume is given by two sewuential tapemarks. | |
546 | * Look for this by skipping to the next file (over one tapemark) | |
547 | * and then test for another one (fsr returns 1 if a tapemark was | |
548 | * encountered). | |
549 | */ | |
550 | do { | |
551 | if ((rc = tape_mtop(device, MTFSF, 1)) < 0) | |
552 | return rc; | |
553 | if ((rc = tape_mtop(device, MTFSR, 1)) < 0) | |
554 | return rc; | |
555 | } while (rc == 0); | |
556 | ||
557 | return tape_mtop(device, MTBSR, 1); | |
558 | } | |
559 | ||
560 | /* | |
561 | * MTRETEN: Retension the tape, i.e. forward space to end of tape and rewind. | |
562 | */ | |
563 | int | |
564 | tape_std_mtreten(struct tape_device *device, int mt_count) | |
565 | { | |
566 | struct tape_request *request; | |
567 | int rc; | |
568 | ||
569 | request = tape_alloc_request(4, 0); | |
570 | if (IS_ERR(request)) | |
571 | return PTR_ERR(request); | |
572 | request->op = TO_FSF; | |
573 | /* setup ccws */ | |
574 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
575 | tape_ccw_cc(request->cpaddr + 1,FORSPACEFILE, 0, NULL); | |
576 | tape_ccw_cc(request->cpaddr + 2, NOP, 0, NULL); | |
577 | tape_ccw_end(request->cpaddr + 3, CCW_CMD_TIC, 0, request->cpaddr); | |
578 | /* execute it, MTRETEN rc gets ignored */ | |
579 | rc = tape_do_io_interruptible(device, request); | |
580 | tape_free_request(request); | |
581 | return tape_mtop(device, MTREW, 1); | |
582 | } | |
583 | ||
584 | /* | |
585 | * MTERASE: erases the tape. | |
586 | */ | |
587 | int | |
588 | tape_std_mterase(struct tape_device *device, int mt_count) | |
589 | { | |
590 | struct tape_request *request; | |
591 | ||
592 | request = tape_alloc_request(6, 0); | |
593 | if (IS_ERR(request)) | |
594 | return PTR_ERR(request); | |
595 | request->op = TO_DSE; | |
596 | /* setup ccws */ | |
597 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
598 | tape_ccw_cc(request->cpaddr + 1, REWIND, 0, NULL); | |
599 | tape_ccw_cc(request->cpaddr + 2, ERASE_GAP, 0, NULL); | |
600 | tape_ccw_cc(request->cpaddr + 3, DATA_SEC_ERASE, 0, NULL); | |
601 | tape_ccw_cc(request->cpaddr + 4, REWIND, 0, NULL); | |
602 | tape_ccw_end(request->cpaddr + 5, NOP, 0, NULL); | |
603 | ||
604 | /* execute it */ | |
605 | return tape_do_io_free(device, request); | |
606 | } | |
607 | ||
608 | /* | |
609 | * MTUNLOAD: Rewind the tape and unload it. | |
610 | */ | |
611 | int | |
612 | tape_std_mtunload(struct tape_device *device, int mt_count) | |
613 | { | |
614 | return tape_mtop(device, MTOFFL, mt_count); | |
615 | } | |
616 | ||
617 | /* | |
618 | * MTCOMPRESSION: used to enable compression. | |
619 | * Sets the IDRC on/off. | |
620 | */ | |
621 | int | |
622 | tape_std_mtcompression(struct tape_device *device, int mt_count) | |
623 | { | |
624 | struct tape_request *request; | |
625 | ||
626 | if (mt_count < 0 || mt_count > 1) { | |
627 | DBF_EXCEPTION(6, "xcom parm\n"); | |
1da177e4 LT |
628 | return -EINVAL; |
629 | } | |
630 | request = tape_alloc_request(2, 0); | |
631 | if (IS_ERR(request)) | |
632 | return PTR_ERR(request); | |
633 | request->op = TO_NOP; | |
634 | /* setup ccws */ | |
4925c7e2 MH |
635 | if (mt_count == 0) |
636 | *device->modeset_byte &= ~0x08; | |
637 | else | |
638 | *device->modeset_byte |= 0x08; | |
1da177e4 LT |
639 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); |
640 | tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); | |
641 | /* execute it */ | |
642 | return tape_do_io_free(device, request); | |
643 | } | |
644 | ||
645 | /* | |
646 | * Read Block | |
647 | */ | |
648 | struct tape_request * | |
649 | tape_std_read_block(struct tape_device *device, size_t count) | |
650 | { | |
651 | struct tape_request *request; | |
652 | ||
653 | /* | |
654 | * We have to alloc 4 ccws in order to be able to transform request | |
655 | * into a read backward request in error case. | |
656 | */ | |
657 | request = tape_alloc_request(4, 0); | |
658 | if (IS_ERR(request)) { | |
659 | DBF_EXCEPTION(6, "xrbl fail"); | |
660 | return request; | |
661 | } | |
662 | request->op = TO_RFO; | |
663 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
664 | tape_ccw_end_idal(request->cpaddr + 1, READ_FORWARD, | |
665 | device->char_data.idal_buf); | |
666 | DBF_EVENT(6, "xrbl ccwg\n"); | |
667 | return request; | |
668 | } | |
669 | ||
670 | /* | |
671 | * Read Block backward transformation function. | |
672 | */ | |
673 | void | |
674 | tape_std_read_backward(struct tape_device *device, struct tape_request *request) | |
675 | { | |
676 | /* | |
677 | * We have allocated 4 ccws in tape_std_read, so we can now | |
678 | * transform the request to a read backward, followed by a | |
679 | * forward space block. | |
680 | */ | |
681 | request->op = TO_RBA; | |
682 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
683 | tape_ccw_cc_idal(request->cpaddr + 1, READ_BACKWARD, | |
684 | device->char_data.idal_buf); | |
685 | tape_ccw_cc(request->cpaddr + 2, FORSPACEBLOCK, 0, NULL); | |
686 | tape_ccw_end(request->cpaddr + 3, NOP, 0, NULL); | |
687 | DBF_EVENT(6, "xrop ccwg");} | |
688 | ||
689 | /* | |
690 | * Write Block | |
691 | */ | |
692 | struct tape_request * | |
693 | tape_std_write_block(struct tape_device *device, size_t count) | |
694 | { | |
695 | struct tape_request *request; | |
696 | ||
697 | request = tape_alloc_request(2, 0); | |
698 | if (IS_ERR(request)) { | |
699 | DBF_EXCEPTION(6, "xwbl fail\n"); | |
700 | return request; | |
701 | } | |
702 | request->op = TO_WRI; | |
703 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
704 | tape_ccw_end_idal(request->cpaddr + 1, WRITE_CMD, | |
705 | device->char_data.idal_buf); | |
706 | DBF_EVENT(6, "xwbl ccwg\n"); | |
707 | return request; | |
708 | } | |
709 | ||
710 | /* | |
711 | * This routine is called by frontend after an ENOSP on write | |
712 | */ | |
713 | void | |
714 | tape_std_process_eov(struct tape_device *device) | |
715 | { | |
716 | /* | |
717 | * End of volume: We have to backspace the last written record, then | |
718 | * we TRY to write a tapemark and then backspace over the written TM | |
719 | */ | |
720 | if (tape_mtop(device, MTBSR, 1) == 0 && | |
721 | tape_mtop(device, MTWEOF, 1) == 0) { | |
722 | tape_mtop(device, MTBSR, 1); | |
723 | } | |
724 | } | |
725 | ||
726 | EXPORT_SYMBOL(tape_std_assign); | |
727 | EXPORT_SYMBOL(tape_std_unassign); | |
728 | EXPORT_SYMBOL(tape_std_display); | |
729 | EXPORT_SYMBOL(tape_std_read_block_id); | |
730 | EXPORT_SYMBOL(tape_std_mtload); | |
731 | EXPORT_SYMBOL(tape_std_mtsetblk); | |
732 | EXPORT_SYMBOL(tape_std_mtreset); | |
733 | EXPORT_SYMBOL(tape_std_mtfsf); | |
734 | EXPORT_SYMBOL(tape_std_mtfsr); | |
735 | EXPORT_SYMBOL(tape_std_mtbsr); | |
736 | EXPORT_SYMBOL(tape_std_mtweof); | |
737 | EXPORT_SYMBOL(tape_std_mtbsfm); | |
738 | EXPORT_SYMBOL(tape_std_mtbsf); | |
739 | EXPORT_SYMBOL(tape_std_mtfsfm); | |
740 | EXPORT_SYMBOL(tape_std_mtrew); | |
741 | EXPORT_SYMBOL(tape_std_mtoffl); | |
742 | EXPORT_SYMBOL(tape_std_mtnop); | |
743 | EXPORT_SYMBOL(tape_std_mteom); | |
744 | EXPORT_SYMBOL(tape_std_mtreten); | |
745 | EXPORT_SYMBOL(tape_std_mterase); | |
746 | EXPORT_SYMBOL(tape_std_mtunload); | |
747 | EXPORT_SYMBOL(tape_std_mtcompression); | |
748 | EXPORT_SYMBOL(tape_std_read_block); | |
749 | EXPORT_SYMBOL(tape_std_read_backward); | |
750 | EXPORT_SYMBOL(tape_std_write_block); | |
751 | EXPORT_SYMBOL(tape_std_process_eov); |