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1da177e4 LT |
1 | /* |
2 | * drivers/s390/char/tape_34xx.c | |
3 | * tape device discipline for 3480/3490 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 | * Tuan Ngo-Anh <ngoanh@de.ibm.com> | |
9 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
10 | */ | |
11 | ||
12 | #include <linux/config.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/bio.h> | |
16 | #include <linux/workqueue.h> | |
17 | ||
18 | #define TAPE_DBF_AREA tape_34xx_dbf | |
19 | ||
20 | #include "tape.h" | |
21 | #include "tape_std.h" | |
22 | ||
23 | #define PRINTK_HEADER "TAPE_34XX: " | |
24 | ||
25 | /* | |
26 | * Pointer to debug area. | |
27 | */ | |
28 | debug_info_t *TAPE_DBF_AREA = NULL; | |
29 | EXPORT_SYMBOL(TAPE_DBF_AREA); | |
30 | ||
31 | enum tape_34xx_type { | |
32 | tape_3480, | |
33 | tape_3490, | |
34 | }; | |
35 | ||
36 | #define TAPE34XX_FMT_3480 0 | |
37 | #define TAPE34XX_FMT_3480_2_XF 1 | |
38 | #define TAPE34XX_FMT_3480_XF 2 | |
39 | ||
40 | struct tape_34xx_block_id { | |
41 | unsigned int wrap : 1; | |
42 | unsigned int segment : 7; | |
43 | unsigned int format : 2; | |
44 | unsigned int block : 22; | |
45 | }; | |
46 | ||
47 | /* | |
48 | * A list of block ID's is used to faster seek blocks. | |
49 | */ | |
50 | struct tape_34xx_sbid { | |
51 | struct list_head list; | |
52 | struct tape_34xx_block_id bid; | |
53 | }; | |
54 | ||
55 | static void tape_34xx_delete_sbid_from(struct tape_device *, int); | |
56 | ||
57 | /* | |
58 | * Medium sense for 34xx tapes. There is no 'real' medium sense call. | |
59 | * So we just do a normal sense. | |
60 | */ | |
61 | static int | |
62 | tape_34xx_medium_sense(struct tape_device *device) | |
63 | { | |
64 | struct tape_request *request; | |
65 | unsigned char *sense; | |
66 | int rc; | |
67 | ||
68 | request = tape_alloc_request(1, 32); | |
69 | if (IS_ERR(request)) { | |
70 | DBF_EXCEPTION(6, "MSEN fail\n"); | |
71 | return PTR_ERR(request); | |
72 | } | |
73 | ||
74 | request->op = TO_MSEN; | |
75 | tape_ccw_end(request->cpaddr, SENSE, 32, request->cpdata); | |
76 | ||
77 | rc = tape_do_io_interruptible(device, request); | |
78 | if (request->rc == 0) { | |
79 | sense = request->cpdata; | |
80 | ||
81 | /* | |
82 | * This isn't quite correct. But since INTERVENTION_REQUIRED | |
83 | * means that the drive is 'neither ready nor on-line' it is | |
84 | * only slightly inaccurate to say there is no tape loaded if | |
85 | * the drive isn't online... | |
86 | */ | |
87 | if (sense[0] & SENSE_INTERVENTION_REQUIRED) | |
88 | tape_med_state_set(device, MS_UNLOADED); | |
89 | else | |
90 | tape_med_state_set(device, MS_LOADED); | |
91 | ||
92 | if (sense[1] & SENSE_WRITE_PROTECT) | |
93 | device->tape_generic_status |= GMT_WR_PROT(~0); | |
94 | else | |
95 | device->tape_generic_status &= ~GMT_WR_PROT(~0); | |
96 | } else { | |
97 | DBF_EVENT(4, "tape_34xx: medium sense failed with rc=%d\n", | |
98 | request->rc); | |
99 | } | |
100 | tape_free_request(request); | |
101 | ||
102 | return rc; | |
103 | } | |
104 | ||
105 | /* | |
106 | * These functions are currently used only to schedule a medium_sense for | |
107 | * later execution. This is because we get an interrupt whenever a medium | |
108 | * is inserted but cannot call tape_do_io* from an interrupt context. | |
109 | * Maybe that's useful for other actions we want to start from the | |
110 | * interrupt handler. | |
111 | */ | |
112 | static void | |
113 | tape_34xx_work_handler(void *data) | |
114 | { | |
115 | struct { | |
116 | struct tape_device *device; | |
117 | enum tape_op op; | |
118 | struct work_struct work; | |
119 | } *p = data; | |
120 | ||
121 | switch(p->op) { | |
122 | case TO_MSEN: | |
123 | tape_34xx_medium_sense(p->device); | |
124 | break; | |
125 | default: | |
126 | DBF_EVENT(3, "T34XX: internal error: unknown work\n"); | |
127 | } | |
128 | ||
129 | p->device = tape_put_device(p->device); | |
130 | kfree(p); | |
131 | } | |
132 | ||
133 | static int | |
134 | tape_34xx_schedule_work(struct tape_device *device, enum tape_op op) | |
135 | { | |
136 | struct { | |
137 | struct tape_device *device; | |
138 | enum tape_op op; | |
139 | struct work_struct work; | |
140 | } *p; | |
141 | ||
142 | if ((p = kmalloc(sizeof(*p), GFP_ATOMIC)) == NULL) | |
143 | return -ENOMEM; | |
144 | ||
145 | memset(p, 0, sizeof(*p)); | |
146 | INIT_WORK(&p->work, tape_34xx_work_handler, p); | |
147 | ||
148 | p->device = tape_get_device_reference(device); | |
149 | p->op = op; | |
150 | ||
151 | schedule_work(&p->work); | |
152 | return 0; | |
153 | } | |
154 | ||
155 | /* | |
156 | * Done Handler is called when dev stat = DEVICE-END (successful operation) | |
157 | */ | |
158 | static inline int | |
159 | tape_34xx_done(struct tape_request *request) | |
160 | { | |
161 | DBF_EVENT(6, "%s done\n", tape_op_verbose[request->op]); | |
162 | ||
163 | switch (request->op) { | |
164 | case TO_DSE: | |
165 | case TO_RUN: | |
166 | case TO_WRI: | |
167 | case TO_WTM: | |
168 | case TO_ASSIGN: | |
169 | case TO_UNASSIGN: | |
170 | tape_34xx_delete_sbid_from(request->device, 0); | |
171 | break; | |
172 | default: | |
173 | ; | |
174 | } | |
175 | return TAPE_IO_SUCCESS; | |
176 | } | |
177 | ||
178 | static inline int | |
179 | tape_34xx_erp_failed(struct tape_request *request, int rc) | |
180 | { | |
181 | DBF_EVENT(3, "Error recovery failed for %s (RC=%d)\n", | |
182 | tape_op_verbose[request->op], rc); | |
183 | return rc; | |
184 | } | |
185 | ||
186 | static inline int | |
187 | tape_34xx_erp_succeeded(struct tape_request *request) | |
188 | { | |
189 | DBF_EVENT(3, "Error Recovery successful for %s\n", | |
190 | tape_op_verbose[request->op]); | |
191 | return tape_34xx_done(request); | |
192 | } | |
193 | ||
194 | static inline int | |
195 | tape_34xx_erp_retry(struct tape_request *request) | |
196 | { | |
197 | DBF_EVENT(3, "xerp retr %s\n", tape_op_verbose[request->op]); | |
198 | return TAPE_IO_RETRY; | |
199 | } | |
200 | ||
201 | /* | |
202 | * This function is called, when no request is outstanding and we get an | |
203 | * interrupt | |
204 | */ | |
205 | static int | |
206 | tape_34xx_unsolicited_irq(struct tape_device *device, struct irb *irb) | |
207 | { | |
208 | if (irb->scsw.dstat == 0x85 /* READY */) { | |
209 | /* A medium was inserted in the drive. */ | |
210 | DBF_EVENT(6, "xuud med\n"); | |
211 | tape_34xx_delete_sbid_from(device, 0); | |
212 | tape_34xx_schedule_work(device, TO_MSEN); | |
213 | } else { | |
214 | DBF_EVENT(3, "unsol.irq! dev end: %08x\n", device->cdev_id); | |
215 | PRINT_WARN("Unsolicited IRQ (Device End) caught.\n"); | |
216 | tape_dump_sense(device, NULL, irb); | |
217 | } | |
218 | return TAPE_IO_SUCCESS; | |
219 | } | |
220 | ||
221 | /* | |
222 | * Read Opposite Error Recovery Function: | |
223 | * Used, when Read Forward does not work | |
224 | */ | |
225 | static int | |
226 | tape_34xx_erp_read_opposite(struct tape_device *device, | |
227 | struct tape_request *request) | |
228 | { | |
229 | if (request->op == TO_RFO) { | |
230 | /* | |
231 | * We did read forward, but the data could not be read | |
232 | * *correctly*. We transform the request to a read backward | |
233 | * and try again. | |
234 | */ | |
235 | tape_std_read_backward(device, request); | |
236 | return tape_34xx_erp_retry(request); | |
237 | } | |
238 | if (request->op != TO_RBA) | |
239 | PRINT_ERR("read_opposite called with state:%s\n", | |
240 | tape_op_verbose[request->op]); | |
241 | /* | |
242 | * We tried to read forward and backward, but hat no | |
243 | * success -> failed. | |
244 | */ | |
245 | return tape_34xx_erp_failed(request, -EIO); | |
246 | } | |
247 | ||
248 | static int | |
249 | tape_34xx_erp_bug(struct tape_device *device, struct tape_request *request, | |
250 | struct irb *irb, int no) | |
251 | { | |
252 | if (request->op != TO_ASSIGN) { | |
253 | PRINT_WARN("An unexpected condition #%d was caught in " | |
254 | "tape error recovery.\n", no); | |
255 | PRINT_WARN("Please report this incident.\n"); | |
256 | if (request) | |
257 | PRINT_WARN("Operation of tape:%s\n", | |
258 | tape_op_verbose[request->op]); | |
259 | tape_dump_sense(device, request, irb); | |
260 | } | |
261 | return tape_34xx_erp_failed(request, -EIO); | |
262 | } | |
263 | ||
264 | /* | |
265 | * Handle data overrun between cu and drive. The channel speed might | |
266 | * be too slow. | |
267 | */ | |
268 | static int | |
269 | tape_34xx_erp_overrun(struct tape_device *device, struct tape_request *request, | |
270 | struct irb *irb) | |
271 | { | |
272 | if (irb->ecw[3] == 0x40) { | |
273 | PRINT_WARN ("Data overrun error between control-unit " | |
274 | "and drive. Use a faster channel connection, " | |
275 | "if possible! \n"); | |
276 | return tape_34xx_erp_failed(request, -EIO); | |
277 | } | |
278 | return tape_34xx_erp_bug(device, request, irb, -1); | |
279 | } | |
280 | ||
281 | /* | |
282 | * Handle record sequence error. | |
283 | */ | |
284 | static int | |
285 | tape_34xx_erp_sequence(struct tape_device *device, | |
286 | struct tape_request *request, struct irb *irb) | |
287 | { | |
288 | if (irb->ecw[3] == 0x41) { | |
289 | /* | |
290 | * cu detected incorrect block-id sequence on tape. | |
291 | */ | |
292 | PRINT_WARN("Illegal block-id sequence found!\n"); | |
293 | return tape_34xx_erp_failed(request, -EIO); | |
294 | } | |
295 | /* | |
296 | * Record sequence error bit is set, but erpa does not | |
297 | * show record sequence error. | |
298 | */ | |
299 | return tape_34xx_erp_bug(device, request, irb, -2); | |
300 | } | |
301 | ||
302 | /* | |
303 | * This function analyses the tape's sense-data in case of a unit-check. | |
304 | * If possible, it tries to recover from the error. Else the user is | |
305 | * informed about the problem. | |
306 | */ | |
307 | static int | |
308 | tape_34xx_unit_check(struct tape_device *device, struct tape_request *request, | |
309 | struct irb *irb) | |
310 | { | |
311 | int inhibit_cu_recovery; | |
312 | __u8* sense; | |
313 | ||
314 | inhibit_cu_recovery = (*device->modeset_byte & 0x80) ? 1 : 0; | |
315 | sense = irb->ecw; | |
316 | ||
317 | #ifdef CONFIG_S390_TAPE_BLOCK | |
318 | if (request->op == TO_BLOCK) { | |
319 | /* | |
320 | * Recovery for block device requests. Set the block_position | |
321 | * to something invalid and retry. | |
322 | */ | |
323 | device->blk_data.block_position = -1; | |
324 | if (request->retries-- <= 0) | |
325 | return tape_34xx_erp_failed(request, -EIO); | |
326 | else | |
327 | return tape_34xx_erp_retry(request); | |
328 | } | |
329 | #endif | |
330 | ||
331 | if ( | |
332 | sense[0] & SENSE_COMMAND_REJECT && | |
333 | sense[1] & SENSE_WRITE_PROTECT | |
334 | ) { | |
335 | if ( | |
336 | request->op == TO_DSE || | |
337 | request->op == TO_WRI || | |
338 | request->op == TO_WTM | |
339 | ) { | |
340 | /* medium is write protected */ | |
341 | return tape_34xx_erp_failed(request, -EACCES); | |
342 | } else { | |
343 | return tape_34xx_erp_bug(device, request, irb, -3); | |
344 | } | |
345 | } | |
346 | ||
347 | /* | |
348 | * Special cases for various tape-states when reaching | |
349 | * end of recorded area | |
350 | * | |
351 | * FIXME: Maybe a special case of the special case: | |
352 | * sense[0] == SENSE_EQUIPMENT_CHECK && | |
353 | * sense[1] == SENSE_DRIVE_ONLINE && | |
354 | * sense[3] == 0x47 (Volume Fenced) | |
355 | * | |
356 | * This was caused by continued FSF or FSR after an | |
357 | * 'End Of Data'. | |
358 | */ | |
359 | if (( | |
360 | sense[0] == SENSE_DATA_CHECK || | |
361 | sense[0] == SENSE_EQUIPMENT_CHECK || | |
362 | sense[0] == SENSE_EQUIPMENT_CHECK + SENSE_DEFERRED_UNIT_CHECK | |
363 | ) && ( | |
364 | sense[1] == SENSE_DRIVE_ONLINE || | |
365 | sense[1] == SENSE_BEGINNING_OF_TAPE + SENSE_WRITE_MODE | |
366 | )) { | |
367 | switch (request->op) { | |
368 | /* | |
369 | * sense[0] == SENSE_DATA_CHECK && | |
370 | * sense[1] == SENSE_DRIVE_ONLINE | |
371 | * sense[3] == 0x36 (End Of Data) | |
372 | * | |
373 | * Further seeks might return a 'Volume Fenced'. | |
374 | */ | |
375 | case TO_FSF: | |
376 | case TO_FSB: | |
377 | /* Trying to seek beyond end of recorded area */ | |
378 | return tape_34xx_erp_failed(request, -ENOSPC); | |
379 | case TO_BSB: | |
380 | return tape_34xx_erp_retry(request); | |
381 | ||
382 | /* | |
383 | * sense[0] == SENSE_DATA_CHECK && | |
384 | * sense[1] == SENSE_DRIVE_ONLINE && | |
385 | * sense[3] == 0x36 (End Of Data) | |
386 | */ | |
387 | case TO_LBL: | |
388 | /* Block could not be located. */ | |
389 | tape_34xx_delete_sbid_from(device, 0); | |
390 | return tape_34xx_erp_failed(request, -EIO); | |
391 | ||
392 | case TO_RFO: | |
393 | /* Read beyond end of recorded area -> 0 bytes read */ | |
394 | return tape_34xx_erp_failed(request, 0); | |
395 | ||
396 | /* | |
397 | * sense[0] == SENSE_EQUIPMENT_CHECK && | |
398 | * sense[1] == SENSE_DRIVE_ONLINE && | |
399 | * sense[3] == 0x38 (Physical End Of Volume) | |
400 | */ | |
401 | case TO_WRI: | |
402 | /* Writing at physical end of volume */ | |
403 | return tape_34xx_erp_failed(request, -ENOSPC); | |
404 | default: | |
405 | PRINT_ERR("Invalid op in %s:%i\n", | |
406 | __FUNCTION__, __LINE__); | |
407 | return tape_34xx_erp_failed(request, 0); | |
408 | } | |
409 | } | |
410 | ||
411 | /* Sensing special bits */ | |
412 | if (sense[0] & SENSE_BUS_OUT_CHECK) | |
413 | return tape_34xx_erp_retry(request); | |
414 | ||
415 | if (sense[0] & SENSE_DATA_CHECK) { | |
416 | /* | |
417 | * hardware failure, damaged tape or improper | |
418 | * operating conditions | |
419 | */ | |
420 | switch (sense[3]) { | |
421 | case 0x23: | |
422 | /* a read data check occurred */ | |
423 | if ((sense[2] & SENSE_TAPE_SYNC_MODE) || | |
424 | inhibit_cu_recovery) | |
425 | // data check is not permanent, may be | |
426 | // recovered. We always use async-mode with | |
427 | // cu-recovery, so this should *never* happen. | |
428 | return tape_34xx_erp_bug(device, request, | |
429 | irb, -4); | |
430 | ||
431 | /* data check is permanent, CU recovery has failed */ | |
432 | PRINT_WARN("Permanent read error\n"); | |
433 | return tape_34xx_erp_failed(request, -EIO); | |
434 | case 0x25: | |
435 | // a write data check occurred | |
436 | if ((sense[2] & SENSE_TAPE_SYNC_MODE) || | |
437 | inhibit_cu_recovery) | |
438 | // data check is not permanent, may be | |
439 | // recovered. We always use async-mode with | |
440 | // cu-recovery, so this should *never* happen. | |
441 | return tape_34xx_erp_bug(device, request, | |
442 | irb, -5); | |
443 | ||
444 | // data check is permanent, cu-recovery has failed | |
445 | PRINT_WARN("Permanent write error\n"); | |
446 | return tape_34xx_erp_failed(request, -EIO); | |
447 | case 0x26: | |
448 | /* Data Check (read opposite) occurred. */ | |
449 | return tape_34xx_erp_read_opposite(device, request); | |
450 | case 0x28: | |
451 | /* ID-Mark at tape start couldn't be written */ | |
452 | PRINT_WARN("ID-Mark could not be written.\n"); | |
453 | return tape_34xx_erp_failed(request, -EIO); | |
454 | case 0x31: | |
455 | /* Tape void. Tried to read beyond end of device. */ | |
456 | PRINT_WARN("Read beyond end of recorded area.\n"); | |
457 | return tape_34xx_erp_failed(request, -ENOSPC); | |
458 | case 0x41: | |
459 | /* Record sequence error. */ | |
460 | PRINT_WARN("Invalid block-id sequence found.\n"); | |
461 | return tape_34xx_erp_failed(request, -EIO); | |
462 | default: | |
463 | /* all data checks for 3480 should result in one of | |
464 | * the above erpa-codes. For 3490, other data-check | |
465 | * conditions do exist. */ | |
466 | if (device->cdev->id.driver_info == tape_3480) | |
467 | return tape_34xx_erp_bug(device, request, | |
468 | irb, -6); | |
469 | } | |
470 | } | |
471 | ||
472 | if (sense[0] & SENSE_OVERRUN) | |
473 | return tape_34xx_erp_overrun(device, request, irb); | |
474 | ||
475 | if (sense[1] & SENSE_RECORD_SEQUENCE_ERR) | |
476 | return tape_34xx_erp_sequence(device, request, irb); | |
477 | ||
478 | /* Sensing erpa codes */ | |
479 | switch (sense[3]) { | |
480 | case 0x00: | |
481 | /* Unit check with erpa code 0. Report and ignore. */ | |
482 | PRINT_WARN("Non-error sense was found. " | |
483 | "Unit-check will be ignored.\n"); | |
484 | return TAPE_IO_SUCCESS; | |
485 | case 0x21: | |
486 | /* | |
487 | * Data streaming not operational. CU will switch to | |
488 | * interlock mode. Reissue the command. | |
489 | */ | |
490 | PRINT_WARN("Data streaming not operational. " | |
491 | "Switching to interlock-mode.\n"); | |
492 | return tape_34xx_erp_retry(request); | |
493 | case 0x22: | |
494 | /* | |
495 | * Path equipment check. Might be drive adapter error, buffer | |
496 | * error on the lower interface, internal path not usable, | |
497 | * or error during cartridge load. | |
498 | */ | |
499 | PRINT_WARN("A path equipment check occurred. One of the " | |
500 | "following conditions occurred:\n"); | |
501 | PRINT_WARN("drive adapter error, buffer error on the lower " | |
502 | "interface, internal path not usable, error " | |
503 | "during cartridge load.\n"); | |
504 | return tape_34xx_erp_failed(request, -EIO); | |
505 | case 0x24: | |
506 | /* | |
507 | * Load display check. Load display was command was issued, | |
508 | * but the drive is displaying a drive check message. Can | |
509 | * be threated as "device end". | |
510 | */ | |
511 | return tape_34xx_erp_succeeded(request); | |
512 | case 0x27: | |
513 | /* | |
514 | * Command reject. May indicate illegal channel program or | |
515 | * buffer over/underrun. Since all channel programs are | |
516 | * issued by this driver and ought be correct, we assume a | |
517 | * over/underrun situation and retry the channel program. | |
518 | */ | |
519 | return tape_34xx_erp_retry(request); | |
520 | case 0x29: | |
521 | /* | |
522 | * Function incompatible. Either the tape is idrc compressed | |
523 | * but the hardware isn't capable to do idrc, or a perform | |
524 | * subsystem func is issued and the CU is not on-line. | |
525 | */ | |
526 | PRINT_WARN ("Function incompatible. Try to switch off idrc\n"); | |
527 | return tape_34xx_erp_failed(request, -EIO); | |
528 | case 0x2a: | |
529 | /* | |
530 | * Unsolicited environmental data. An internal counter | |
531 | * overflows, we can ignore this and reissue the cmd. | |
532 | */ | |
533 | return tape_34xx_erp_retry(request); | |
534 | case 0x2b: | |
535 | /* | |
536 | * Environmental data present. Indicates either unload | |
537 | * completed ok or read buffered log command completed ok. | |
538 | */ | |
539 | if (request->op == TO_RUN) { | |
540 | /* Rewind unload completed ok. */ | |
541 | tape_med_state_set(device, MS_UNLOADED); | |
542 | return tape_34xx_erp_succeeded(request); | |
543 | } | |
544 | /* tape_34xx doesn't use read buffered log commands. */ | |
545 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
546 | case 0x2c: | |
547 | /* | |
548 | * Permanent equipment check. CU has tried recovery, but | |
549 | * did not succeed. | |
550 | */ | |
551 | return tape_34xx_erp_failed(request, -EIO); | |
552 | case 0x2d: | |
553 | /* Data security erase failure. */ | |
554 | if (request->op == TO_DSE) | |
555 | return tape_34xx_erp_failed(request, -EIO); | |
556 | /* Data security erase failure, but no such command issued. */ | |
557 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
558 | case 0x2e: | |
559 | /* | |
560 | * Not capable. This indicates either that the drive fails | |
561 | * reading the format id mark or that that format specified | |
562 | * is not supported by the drive. | |
563 | */ | |
564 | PRINT_WARN("Drive not capable processing the tape format!\n"); | |
565 | return tape_34xx_erp_failed(request, -EMEDIUMTYPE); | |
566 | case 0x30: | |
567 | /* The medium is write protected. */ | |
568 | PRINT_WARN("Medium is write protected!\n"); | |
569 | return tape_34xx_erp_failed(request, -EACCES); | |
570 | case 0x32: | |
571 | // Tension loss. We cannot recover this, it's an I/O error. | |
572 | PRINT_WARN("The drive lost tape tension.\n"); | |
573 | return tape_34xx_erp_failed(request, -EIO); | |
574 | case 0x33: | |
575 | /* | |
576 | * Load Failure. The cartridge was not inserted correctly or | |
577 | * the tape is not threaded correctly. | |
578 | */ | |
579 | PRINT_WARN("Cartridge load failure. Reload the cartridge " | |
580 | "and try again.\n"); | |
581 | tape_34xx_delete_sbid_from(device, 0); | |
582 | return tape_34xx_erp_failed(request, -EIO); | |
583 | case 0x34: | |
584 | /* | |
585 | * Unload failure. The drive cannot maintain tape tension | |
586 | * and control tape movement during an unload operation. | |
587 | */ | |
588 | PRINT_WARN("Failure during cartridge unload. " | |
589 | "Please try manually.\n"); | |
590 | if (request->op == TO_RUN) | |
591 | return tape_34xx_erp_failed(request, -EIO); | |
592 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
593 | case 0x35: | |
594 | /* | |
595 | * Drive equipment check. One of the following: | |
596 | * - cu cannot recover from a drive detected error | |
597 | * - a check code message is shown on drive display | |
598 | * - the cartridge loader does not respond correctly | |
599 | * - a failure occurs during an index, load, or unload cycle | |
600 | */ | |
601 | PRINT_WARN("Equipment check! Please check the drive and " | |
602 | "the cartridge loader.\n"); | |
603 | return tape_34xx_erp_failed(request, -EIO); | |
604 | case 0x36: | |
605 | if (device->cdev->id.driver_info == tape_3490) | |
606 | /* End of data. */ | |
607 | return tape_34xx_erp_failed(request, -EIO); | |
608 | /* This erpa is reserved for 3480 */ | |
609 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
610 | case 0x37: | |
611 | /* | |
612 | * Tape length error. The tape is shorter than reported in | |
613 | * the beginning-of-tape data. | |
614 | */ | |
615 | PRINT_WARN("Tape length error.\n"); | |
616 | return tape_34xx_erp_failed(request, -EIO); | |
617 | case 0x38: | |
618 | /* | |
619 | * Physical end of tape. A read/write operation reached | |
620 | * the physical end of tape. | |
621 | */ | |
622 | if (request->op==TO_WRI || | |
623 | request->op==TO_DSE || | |
624 | request->op==TO_WTM) | |
625 | return tape_34xx_erp_failed(request, -ENOSPC); | |
626 | return tape_34xx_erp_failed(request, -EIO); | |
627 | case 0x39: | |
628 | /* Backward at Beginning of tape. */ | |
629 | return tape_34xx_erp_failed(request, -EIO); | |
630 | case 0x3a: | |
631 | /* Drive switched to not ready. */ | |
632 | PRINT_WARN("Drive not ready. Turn the ready/not ready switch " | |
633 | "to ready position and try again.\n"); | |
634 | return tape_34xx_erp_failed(request, -EIO); | |
635 | case 0x3b: | |
636 | /* Manual rewind or unload. This causes an I/O error. */ | |
637 | PRINT_WARN("Medium was rewound or unloaded manually.\n"); | |
638 | tape_34xx_delete_sbid_from(device, 0); | |
639 | return tape_34xx_erp_failed(request, -EIO); | |
640 | case 0x42: | |
641 | /* | |
642 | * Degraded mode. A condition that can cause degraded | |
643 | * performance is detected. | |
644 | */ | |
645 | PRINT_WARN("Subsystem is running in degraded mode.\n"); | |
646 | return tape_34xx_erp_retry(request); | |
647 | case 0x43: | |
648 | /* Drive not ready. */ | |
649 | tape_34xx_delete_sbid_from(device, 0); | |
650 | tape_med_state_set(device, MS_UNLOADED); | |
651 | /* Some commands commands are successful even in this case */ | |
652 | if (sense[1] & SENSE_DRIVE_ONLINE) { | |
653 | switch(request->op) { | |
654 | case TO_ASSIGN: | |
655 | case TO_UNASSIGN: | |
656 | case TO_DIS: | |
657 | case TO_NOP: | |
658 | return tape_34xx_done(request); | |
659 | break; | |
660 | default: | |
661 | break; | |
662 | } | |
663 | } | |
664 | PRINT_WARN("The drive is not ready.\n"); | |
665 | return tape_34xx_erp_failed(request, -ENOMEDIUM); | |
666 | case 0x44: | |
667 | /* Locate Block unsuccessful. */ | |
668 | if (request->op != TO_BLOCK && request->op != TO_LBL) | |
669 | /* No locate block was issued. */ | |
670 | return tape_34xx_erp_bug(device, request, | |
671 | irb, sense[3]); | |
672 | return tape_34xx_erp_failed(request, -EIO); | |
673 | case 0x45: | |
674 | /* The drive is assigned to a different channel path. */ | |
675 | PRINT_WARN("The drive is assigned elsewhere.\n"); | |
676 | return tape_34xx_erp_failed(request, -EIO); | |
677 | case 0x46: | |
678 | /* | |
679 | * Drive not on-line. Drive may be switched offline, | |
680 | * the power supply may be switched off or | |
681 | * the drive address may not be set correctly. | |
682 | */ | |
683 | PRINT_WARN("The drive is not on-line."); | |
684 | return tape_34xx_erp_failed(request, -EIO); | |
685 | case 0x47: | |
686 | /* Volume fenced. CU reports volume integrity is lost. */ | |
687 | PRINT_WARN("Volume fenced. The volume integrity is lost.\n"); | |
688 | tape_34xx_delete_sbid_from(device, 0); | |
689 | return tape_34xx_erp_failed(request, -EIO); | |
690 | case 0x48: | |
691 | /* Log sense data and retry request. */ | |
692 | return tape_34xx_erp_retry(request); | |
693 | case 0x49: | |
694 | /* Bus out check. A parity check error on the bus was found. */ | |
695 | PRINT_WARN("Bus out check. A data transfer over the bus " | |
696 | "has been corrupted.\n"); | |
697 | return tape_34xx_erp_failed(request, -EIO); | |
698 | case 0x4a: | |
699 | /* Control unit erp failed. */ | |
700 | PRINT_WARN("The control unit I/O error recovery failed.\n"); | |
701 | return tape_34xx_erp_failed(request, -EIO); | |
702 | case 0x4b: | |
703 | /* | |
704 | * CU and drive incompatible. The drive requests micro-program | |
705 | * patches, which are not available on the CU. | |
706 | */ | |
707 | PRINT_WARN("The drive needs microprogram patches from the " | |
708 | "control unit, which are not available.\n"); | |
709 | return tape_34xx_erp_failed(request, -EIO); | |
710 | case 0x4c: | |
711 | /* | |
712 | * Recovered Check-One failure. Cu develops a hardware error, | |
713 | * but is able to recover. | |
714 | */ | |
715 | return tape_34xx_erp_retry(request); | |
716 | case 0x4d: | |
717 | if (device->cdev->id.driver_info == tape_3490) | |
718 | /* | |
719 | * Resetting event received. Since the driver does | |
720 | * not support resetting event recovery (which has to | |
721 | * be handled by the I/O Layer), retry our command. | |
722 | */ | |
723 | return tape_34xx_erp_retry(request); | |
724 | /* This erpa is reserved for 3480. */ | |
725 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
726 | case 0x4e: | |
727 | if (device->cdev->id.driver_info == tape_3490) { | |
728 | /* | |
729 | * Maximum block size exceeded. This indicates, that | |
730 | * the block to be written is larger than allowed for | |
731 | * buffered mode. | |
732 | */ | |
733 | PRINT_WARN("Maximum block size for buffered " | |
734 | "mode exceeded.\n"); | |
735 | return tape_34xx_erp_failed(request, -ENOBUFS); | |
736 | } | |
737 | /* This erpa is reserved for 3480. */ | |
738 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
739 | case 0x50: | |
740 | /* | |
741 | * Read buffered log (Overflow). CU is running in extended | |
742 | * buffered log mode, and a counter overflows. This should | |
743 | * never happen, since we're never running in extended | |
744 | * buffered log mode. | |
745 | */ | |
746 | return tape_34xx_erp_retry(request); | |
747 | case 0x51: | |
748 | /* | |
749 | * Read buffered log (EOV). EOF processing occurs while the | |
750 | * CU is in extended buffered log mode. This should never | |
751 | * happen, since we're never running in extended buffered | |
752 | * log mode. | |
753 | */ | |
754 | return tape_34xx_erp_retry(request); | |
755 | case 0x52: | |
756 | /* End of Volume complete. Rewind unload completed ok. */ | |
757 | if (request->op == TO_RUN) { | |
758 | tape_med_state_set(device, MS_UNLOADED); | |
759 | tape_34xx_delete_sbid_from(device, 0); | |
760 | return tape_34xx_erp_succeeded(request); | |
761 | } | |
762 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
763 | case 0x53: | |
764 | /* Global command intercept. */ | |
765 | return tape_34xx_erp_retry(request); | |
766 | case 0x54: | |
767 | /* Channel interface recovery (temporary). */ | |
768 | return tape_34xx_erp_retry(request); | |
769 | case 0x55: | |
770 | /* Channel interface recovery (permanent). */ | |
771 | PRINT_WARN("A permanent channel interface error occurred.\n"); | |
772 | return tape_34xx_erp_failed(request, -EIO); | |
773 | case 0x56: | |
774 | /* Channel protocol error. */ | |
775 | PRINT_WARN("A channel protocol error occurred.\n"); | |
776 | return tape_34xx_erp_failed(request, -EIO); | |
777 | case 0x57: | |
778 | if (device->cdev->id.driver_info == tape_3480) { | |
779 | /* Attention intercept. */ | |
780 | PRINT_WARN("An attention intercept occurred, " | |
781 | "which will be recovered.\n"); | |
782 | return tape_34xx_erp_retry(request); | |
783 | } else { | |
784 | /* Global status intercept. */ | |
785 | PRINT_WARN("An global status intercept was received, " | |
786 | "which will be recovered.\n"); | |
787 | return tape_34xx_erp_retry(request); | |
788 | } | |
789 | case 0x5a: | |
790 | /* | |
791 | * Tape length incompatible. The tape inserted is too long, | |
792 | * which could cause damage to the tape or the drive. | |
793 | */ | |
794 | PRINT_WARN("Tape Length Incompatible\n"); | |
795 | PRINT_WARN("Tape length exceeds IBM enhanced capacity " | |
796 | "cartdridge length or a medium\n"); | |
797 | PRINT_WARN("with EC-CST identification mark has been mounted " | |
798 | "in a device that writes\n"); | |
799 | PRINT_WARN("3480 or 3480 XF format.\n"); | |
800 | return tape_34xx_erp_failed(request, -EIO); | |
801 | case 0x5b: | |
802 | /* Format 3480 XF incompatible */ | |
803 | if (sense[1] & SENSE_BEGINNING_OF_TAPE) | |
804 | /* The tape will get overwritten. */ | |
805 | return tape_34xx_erp_retry(request); | |
806 | PRINT_WARN("Format 3480 XF Incompatible\n"); | |
807 | PRINT_WARN("Medium has been created in 3480 format. " | |
808 | "To change the format writes\n"); | |
809 | PRINT_WARN("must be issued at BOT.\n"); | |
810 | return tape_34xx_erp_failed(request, -EIO); | |
811 | case 0x5c: | |
812 | /* Format 3480-2 XF incompatible */ | |
813 | PRINT_WARN("Format 3480-2 XF Incompatible\n"); | |
814 | PRINT_WARN("Device can only read 3480 or 3480 XF format.\n"); | |
815 | return tape_34xx_erp_failed(request, -EIO); | |
816 | case 0x5d: | |
817 | /* Tape length violation. */ | |
818 | PRINT_WARN("Tape Length Violation\n"); | |
819 | PRINT_WARN("The mounted tape exceeds IBM Enhanced Capacity " | |
820 | "Cartdridge System Tape length.\n"); | |
821 | PRINT_WARN("This may cause damage to the drive or tape when " | |
822 | "processing to the EOV\n"); | |
823 | return tape_34xx_erp_failed(request, -EMEDIUMTYPE); | |
824 | case 0x5e: | |
825 | /* Compaction algorithm incompatible. */ | |
826 | PRINT_WARN("Compaction Algorithm Incompatible\n"); | |
827 | PRINT_WARN("The volume is recorded using an incompatible " | |
828 | "compaction algorithm,\n"); | |
829 | PRINT_WARN("which is not supported by the device.\n"); | |
830 | return tape_34xx_erp_failed(request, -EMEDIUMTYPE); | |
831 | ||
832 | /* The following erpas should have been covered earlier. */ | |
833 | case 0x23: /* Read data check. */ | |
834 | case 0x25: /* Write data check. */ | |
835 | case 0x26: /* Data check (read opposite). */ | |
836 | case 0x28: /* Write id mark check. */ | |
837 | case 0x31: /* Tape void. */ | |
838 | case 0x40: /* Overrun error. */ | |
839 | case 0x41: /* Record sequence error. */ | |
840 | /* All other erpas are reserved for future use. */ | |
841 | default: | |
842 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
843 | } | |
844 | } | |
845 | ||
846 | /* | |
847 | * 3480/3490 interrupt handler | |
848 | */ | |
849 | static int | |
850 | tape_34xx_irq(struct tape_device *device, struct tape_request *request, | |
851 | struct irb *irb) | |
852 | { | |
853 | if (request == NULL) | |
854 | return tape_34xx_unsolicited_irq(device, irb); | |
855 | ||
856 | if ((irb->scsw.dstat & DEV_STAT_UNIT_EXCEP) && | |
857 | (irb->scsw.dstat & DEV_STAT_DEV_END) && | |
858 | (request->op == TO_WRI)) { | |
859 | /* Write at end of volume */ | |
860 | PRINT_INFO("End of volume\n"); /* XXX */ | |
861 | return tape_34xx_erp_failed(request, -ENOSPC); | |
862 | } | |
863 | ||
864 | if (irb->scsw.dstat & DEV_STAT_UNIT_CHECK) | |
865 | return tape_34xx_unit_check(device, request, irb); | |
866 | ||
867 | if (irb->scsw.dstat & DEV_STAT_DEV_END) { | |
868 | /* | |
869 | * A unit exception occurs on skipping over a tapemark block. | |
870 | */ | |
871 | if (irb->scsw.dstat & DEV_STAT_UNIT_EXCEP) { | |
872 | if (request->op == TO_BSB || request->op == TO_FSB) | |
873 | request->rescnt++; | |
874 | else | |
875 | DBF_EVENT(5, "Unit Exception!\n"); | |
876 | } | |
877 | return tape_34xx_done(request); | |
878 | } | |
879 | ||
880 | DBF_EVENT(6, "xunknownirq\n"); | |
881 | PRINT_ERR("Unexpected interrupt.\n"); | |
882 | PRINT_ERR("Current op is: %s", tape_op_verbose[request->op]); | |
883 | tape_dump_sense(device, request, irb); | |
884 | return TAPE_IO_STOP; | |
885 | } | |
886 | ||
887 | /* | |
888 | * ioctl_overload | |
889 | */ | |
890 | static int | |
891 | tape_34xx_ioctl(struct tape_device *device, unsigned int cmd, unsigned long arg) | |
892 | { | |
893 | if (cmd == TAPE390_DISPLAY) { | |
894 | struct display_struct disp; | |
895 | ||
896 | if (copy_from_user(&disp, (char __user *) arg, sizeof(disp)) != 0) | |
897 | return -EFAULT; | |
898 | ||
899 | return tape_std_display(device, &disp); | |
900 | } else | |
901 | return -EINVAL; | |
902 | } | |
903 | ||
904 | static inline void | |
905 | tape_34xx_append_new_sbid(struct tape_34xx_block_id bid, struct list_head *l) | |
906 | { | |
907 | struct tape_34xx_sbid * new_sbid; | |
908 | ||
909 | new_sbid = kmalloc(sizeof(*new_sbid), GFP_ATOMIC); | |
910 | if (!new_sbid) | |
911 | return; | |
912 | ||
913 | new_sbid->bid = bid; | |
914 | list_add(&new_sbid->list, l); | |
915 | } | |
916 | ||
917 | /* | |
918 | * Build up the search block ID list. The block ID consists of a logical | |
919 | * block number and a hardware specific part. The hardware specific part | |
920 | * helps the tape drive to speed up searching for a specific block. | |
921 | */ | |
922 | static void | |
923 | tape_34xx_add_sbid(struct tape_device *device, struct tape_34xx_block_id bid) | |
924 | { | |
925 | struct list_head * sbid_list; | |
926 | struct tape_34xx_sbid * sbid; | |
927 | struct list_head * l; | |
928 | ||
929 | /* | |
930 | * immediately return if there is no list at all or the block to add | |
931 | * is located in segment 1 of wrap 0 because this position is used | |
932 | * if no hardware position data is supplied. | |
933 | */ | |
934 | sbid_list = (struct list_head *) device->discdata; | |
935 | if (!sbid_list || (bid.segment < 2 && bid.wrap == 0)) | |
936 | return; | |
937 | ||
938 | /* | |
939 | * Search the position where to insert the new entry. Hardware | |
940 | * acceleration uses only the segment and wrap number. So we | |
941 | * need only one entry for a specific wrap/segment combination. | |
942 | * If there is a block with a lower number but the same hard- | |
943 | * ware position data we just update the block number in the | |
944 | * existing entry. | |
945 | */ | |
946 | list_for_each(l, sbid_list) { | |
947 | sbid = list_entry(l, struct tape_34xx_sbid, list); | |
948 | ||
949 | if ( | |
950 | (sbid->bid.segment == bid.segment) && | |
951 | (sbid->bid.wrap == bid.wrap) | |
952 | ) { | |
953 | if (bid.block < sbid->bid.block) | |
954 | sbid->bid = bid; | |
955 | else return; | |
956 | break; | |
957 | } | |
958 | ||
959 | /* Sort in according to logical block number. */ | |
960 | if (bid.block < sbid->bid.block) { | |
961 | tape_34xx_append_new_sbid(bid, l->prev); | |
962 | break; | |
963 | } | |
964 | } | |
965 | /* List empty or new block bigger than last entry. */ | |
966 | if (l == sbid_list) | |
967 | tape_34xx_append_new_sbid(bid, l->prev); | |
968 | ||
969 | DBF_LH(4, "Current list is:\n"); | |
970 | list_for_each(l, sbid_list) { | |
971 | sbid = list_entry(l, struct tape_34xx_sbid, list); | |
972 | DBF_LH(4, "%d:%03d@%05d\n", | |
973 | sbid->bid.wrap, | |
974 | sbid->bid.segment, | |
975 | sbid->bid.block | |
976 | ); | |
977 | } | |
978 | } | |
979 | ||
980 | /* | |
981 | * Delete all entries from the search block ID list that belong to tape blocks | |
982 | * equal or higher than the given number. | |
983 | */ | |
984 | static void | |
985 | tape_34xx_delete_sbid_from(struct tape_device *device, int from) | |
986 | { | |
987 | struct list_head * sbid_list; | |
988 | struct tape_34xx_sbid * sbid; | |
989 | struct list_head * l; | |
990 | struct list_head * n; | |
991 | ||
992 | sbid_list = (struct list_head *) device->discdata; | |
993 | if (!sbid_list) | |
994 | return; | |
995 | ||
996 | list_for_each_safe(l, n, sbid_list) { | |
997 | sbid = list_entry(l, struct tape_34xx_sbid, list); | |
998 | if (sbid->bid.block >= from) { | |
999 | DBF_LH(4, "Delete sbid %d:%03d@%05d\n", | |
1000 | sbid->bid.wrap, | |
1001 | sbid->bid.segment, | |
1002 | sbid->bid.block | |
1003 | ); | |
1004 | list_del(l); | |
1005 | kfree(sbid); | |
1006 | } | |
1007 | } | |
1008 | } | |
1009 | ||
1010 | /* | |
1011 | * Merge hardware position data into a block id. | |
1012 | */ | |
1013 | static void | |
1014 | tape_34xx_merge_sbid( | |
1015 | struct tape_device * device, | |
1016 | struct tape_34xx_block_id * bid | |
1017 | ) { | |
1018 | struct tape_34xx_sbid * sbid; | |
1019 | struct tape_34xx_sbid * sbid_to_use; | |
1020 | struct list_head * sbid_list; | |
1021 | struct list_head * l; | |
1022 | ||
1023 | sbid_list = (struct list_head *) device->discdata; | |
1024 | bid->wrap = 0; | |
1025 | bid->segment = 1; | |
1026 | ||
1027 | if (!sbid_list || list_empty(sbid_list)) | |
1028 | return; | |
1029 | ||
1030 | sbid_to_use = NULL; | |
1031 | list_for_each(l, sbid_list) { | |
1032 | sbid = list_entry(l, struct tape_34xx_sbid, list); | |
1033 | ||
1034 | if (sbid->bid.block >= bid->block) | |
1035 | break; | |
1036 | sbid_to_use = sbid; | |
1037 | } | |
1038 | if (sbid_to_use) { | |
1039 | bid->wrap = sbid_to_use->bid.wrap; | |
1040 | bid->segment = sbid_to_use->bid.segment; | |
1041 | DBF_LH(4, "Use %d:%03d@%05d for %05d\n", | |
1042 | sbid_to_use->bid.wrap, | |
1043 | sbid_to_use->bid.segment, | |
1044 | sbid_to_use->bid.block, | |
1045 | bid->block | |
1046 | ); | |
1047 | } | |
1048 | } | |
1049 | ||
1050 | static int | |
1051 | tape_34xx_setup_device(struct tape_device * device) | |
1052 | { | |
1053 | int rc; | |
1054 | struct list_head * discdata; | |
1055 | ||
1056 | DBF_EVENT(6, "34xx device setup\n"); | |
1057 | if ((rc = tape_std_assign(device)) == 0) { | |
1058 | if ((rc = tape_34xx_medium_sense(device)) != 0) { | |
1059 | DBF_LH(3, "34xx medium sense returned %d\n", rc); | |
1060 | } | |
1061 | } | |
1062 | discdata = kmalloc(sizeof(struct list_head), GFP_KERNEL); | |
1063 | if (discdata) { | |
1064 | INIT_LIST_HEAD(discdata); | |
1065 | device->discdata = discdata; | |
1066 | } | |
1067 | ||
1068 | return rc; | |
1069 | } | |
1070 | ||
1071 | static void | |
1072 | tape_34xx_cleanup_device(struct tape_device *device) | |
1073 | { | |
1074 | tape_std_unassign(device); | |
1075 | ||
1076 | if (device->discdata) { | |
1077 | tape_34xx_delete_sbid_from(device, 0); | |
1078 | kfree(device->discdata); | |
1079 | device->discdata = NULL; | |
1080 | } | |
1081 | } | |
1082 | ||
1083 | ||
1084 | /* | |
1085 | * MTTELL: Tell block. Return the number of block relative to current file. | |
1086 | */ | |
1087 | static int | |
1088 | tape_34xx_mttell(struct tape_device *device, int mt_count) | |
1089 | { | |
1090 | struct { | |
1091 | struct tape_34xx_block_id cbid; | |
1092 | struct tape_34xx_block_id dbid; | |
1093 | } __attribute__ ((packed)) block_id; | |
1094 | int rc; | |
1095 | ||
1096 | rc = tape_std_read_block_id(device, (__u64 *) &block_id); | |
1097 | if (rc) | |
1098 | return rc; | |
1099 | ||
1100 | tape_34xx_add_sbid(device, block_id.cbid); | |
1101 | return block_id.cbid.block; | |
1102 | } | |
1103 | ||
1104 | /* | |
1105 | * MTSEEK: seek to the specified block. | |
1106 | */ | |
1107 | static int | |
1108 | tape_34xx_mtseek(struct tape_device *device, int mt_count) | |
1109 | { | |
1110 | struct tape_request *request; | |
1111 | struct tape_34xx_block_id * bid; | |
1112 | ||
1113 | if (mt_count > 0x3fffff) { | |
1114 | DBF_EXCEPTION(6, "xsee parm\n"); | |
1115 | return -EINVAL; | |
1116 | } | |
1117 | request = tape_alloc_request(3, 4); | |
1118 | if (IS_ERR(request)) | |
1119 | return PTR_ERR(request); | |
1120 | ||
1121 | /* setup ccws */ | |
1122 | request->op = TO_LBL; | |
1123 | bid = (struct tape_34xx_block_id *) request->cpdata; | |
1124 | bid->format = (*device->modeset_byte & 0x08) ? | |
1125 | TAPE34XX_FMT_3480_XF : TAPE34XX_FMT_3480; | |
1126 | bid->block = mt_count; | |
1127 | tape_34xx_merge_sbid(device, bid); | |
1128 | ||
1129 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
1130 | tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata); | |
1131 | tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); | |
1132 | ||
1133 | /* execute it */ | |
1134 | return tape_do_io_free(device, request); | |
1135 | } | |
1136 | ||
1137 | #ifdef CONFIG_S390_TAPE_BLOCK | |
1138 | /* | |
1139 | * Tape block read for 34xx. | |
1140 | */ | |
1141 | static struct tape_request * | |
1142 | tape_34xx_bread(struct tape_device *device, struct request *req) | |
1143 | { | |
1144 | struct tape_request *request; | |
1145 | struct ccw1 *ccw; | |
1146 | int count = 0, i; | |
1147 | unsigned off; | |
1148 | char *dst; | |
1149 | struct bio_vec *bv; | |
1150 | struct bio *bio; | |
1151 | struct tape_34xx_block_id * start_block; | |
1152 | ||
1153 | DBF_EVENT(6, "xBREDid:"); | |
1154 | ||
1155 | /* Count the number of blocks for the request. */ | |
1156 | rq_for_each_bio(bio, req) { | |
1157 | bio_for_each_segment(bv, bio, i) { | |
1158 | count += bv->bv_len >> (TAPEBLOCK_HSEC_S2B + 9); | |
1159 | } | |
1160 | } | |
1161 | ||
1162 | /* Allocate the ccw request. */ | |
1163 | request = tape_alloc_request(3+count+1, 8); | |
1164 | if (IS_ERR(request)) | |
1165 | return request; | |
1166 | ||
1167 | /* Setup ccws. */ | |
1168 | request->op = TO_BLOCK; | |
1169 | start_block = (struct tape_34xx_block_id *) request->cpdata; | |
1170 | start_block->block = req->sector >> TAPEBLOCK_HSEC_S2B; | |
1171 | DBF_EVENT(6, "start_block = %i\n", start_block->block); | |
1172 | ||
1173 | ccw = request->cpaddr; | |
1174 | ccw = tape_ccw_cc(ccw, MODE_SET_DB, 1, device->modeset_byte); | |
1175 | ||
1176 | /* | |
1177 | * We always setup a nop after the mode set ccw. This slot is | |
1178 | * used in tape_std_check_locate to insert a locate ccw if the | |
1179 | * current tape position doesn't match the start block to be read. | |
1180 | * The second nop will be filled with a read block id which is in | |
1181 | * turn used by tape_34xx_free_bread to populate the segment bid | |
1182 | * table. | |
1183 | */ | |
1184 | ccw = tape_ccw_cc(ccw, NOP, 0, NULL); | |
1185 | ccw = tape_ccw_cc(ccw, NOP, 0, NULL); | |
1186 | ||
1187 | rq_for_each_bio(bio, req) { | |
1188 | bio_for_each_segment(bv, bio, i) { | |
1189 | dst = kmap(bv->bv_page) + bv->bv_offset; | |
1190 | for (off = 0; off < bv->bv_len; | |
1191 | off += TAPEBLOCK_HSEC_SIZE) { | |
1192 | ccw->flags = CCW_FLAG_CC; | |
1193 | ccw->cmd_code = READ_FORWARD; | |
1194 | ccw->count = TAPEBLOCK_HSEC_SIZE; | |
1195 | set_normalized_cda(ccw, (void*) __pa(dst)); | |
1196 | ccw++; | |
1197 | dst += TAPEBLOCK_HSEC_SIZE; | |
1198 | } | |
1199 | } | |
1200 | } | |
1201 | ||
1202 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
1203 | DBF_EVENT(6, "xBREDccwg\n"); | |
1204 | return request; | |
1205 | } | |
1206 | ||
1207 | static void | |
1208 | tape_34xx_free_bread (struct tape_request *request) | |
1209 | { | |
1210 | struct ccw1* ccw; | |
1211 | ||
1212 | ccw = request->cpaddr; | |
1213 | if ((ccw + 2)->cmd_code == READ_BLOCK_ID) { | |
1214 | struct { | |
1215 | struct tape_34xx_block_id cbid; | |
1216 | struct tape_34xx_block_id dbid; | |
1217 | } __attribute__ ((packed)) *rbi_data; | |
1218 | ||
1219 | rbi_data = request->cpdata; | |
1220 | ||
1221 | if (request->device) | |
1222 | tape_34xx_add_sbid(request->device, rbi_data->cbid); | |
1223 | } | |
1224 | ||
1225 | /* Last ccw is a nop and doesn't need clear_normalized_cda */ | |
1226 | for (; ccw->flags & CCW_FLAG_CC; ccw++) | |
1227 | if (ccw->cmd_code == READ_FORWARD) | |
1228 | clear_normalized_cda(ccw); | |
1229 | tape_free_request(request); | |
1230 | } | |
1231 | ||
1232 | /* | |
1233 | * check_locate is called just before the tape request is passed to | |
1234 | * the common io layer for execution. It has to check the current | |
1235 | * tape position and insert a locate ccw if it doesn't match the | |
1236 | * start block for the request. | |
1237 | */ | |
1238 | static void | |
1239 | tape_34xx_check_locate(struct tape_device *device, struct tape_request *request) | |
1240 | { | |
1241 | struct tape_34xx_block_id * start_block; | |
1242 | ||
1243 | start_block = (struct tape_34xx_block_id *) request->cpdata; | |
1244 | if (start_block->block == device->blk_data.block_position) | |
1245 | return; | |
1246 | ||
1247 | DBF_LH(4, "Block seek(%06d+%06d)\n", start_block->block, device->bof); | |
1248 | start_block->wrap = 0; | |
1249 | start_block->segment = 1; | |
1250 | start_block->format = (*device->modeset_byte & 0x08) ? | |
1251 | TAPE34XX_FMT_3480_XF : | |
1252 | TAPE34XX_FMT_3480; | |
1253 | start_block->block = start_block->block + device->bof; | |
1254 | tape_34xx_merge_sbid(device, start_block); | |
1255 | tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata); | |
1256 | tape_ccw_cc(request->cpaddr + 2, READ_BLOCK_ID, 8, request->cpdata); | |
1257 | } | |
1258 | #endif | |
1259 | ||
1260 | /* | |
1261 | * List of 3480/3490 magnetic tape commands. | |
1262 | */ | |
1263 | static tape_mtop_fn tape_34xx_mtop[TAPE_NR_MTOPS] = { | |
1264 | [MTRESET] = tape_std_mtreset, | |
1265 | [MTFSF] = tape_std_mtfsf, | |
1266 | [MTBSF] = tape_std_mtbsf, | |
1267 | [MTFSR] = tape_std_mtfsr, | |
1268 | [MTBSR] = tape_std_mtbsr, | |
1269 | [MTWEOF] = tape_std_mtweof, | |
1270 | [MTREW] = tape_std_mtrew, | |
1271 | [MTOFFL] = tape_std_mtoffl, | |
1272 | [MTNOP] = tape_std_mtnop, | |
1273 | [MTRETEN] = tape_std_mtreten, | |
1274 | [MTBSFM] = tape_std_mtbsfm, | |
1275 | [MTFSFM] = tape_std_mtfsfm, | |
1276 | [MTEOM] = tape_std_mteom, | |
1277 | [MTERASE] = tape_std_mterase, | |
1278 | [MTRAS1] = NULL, | |
1279 | [MTRAS2] = NULL, | |
1280 | [MTRAS3] = NULL, | |
1281 | [MTSETBLK] = tape_std_mtsetblk, | |
1282 | [MTSETDENSITY] = NULL, | |
1283 | [MTSEEK] = tape_34xx_mtseek, | |
1284 | [MTTELL] = tape_34xx_mttell, | |
1285 | [MTSETDRVBUFFER] = NULL, | |
1286 | [MTFSS] = NULL, | |
1287 | [MTBSS] = NULL, | |
1288 | [MTWSM] = NULL, | |
1289 | [MTLOCK] = NULL, | |
1290 | [MTUNLOCK] = NULL, | |
1291 | [MTLOAD] = tape_std_mtload, | |
1292 | [MTUNLOAD] = tape_std_mtunload, | |
1293 | [MTCOMPRESSION] = tape_std_mtcompression, | |
1294 | [MTSETPART] = NULL, | |
1295 | [MTMKPART] = NULL | |
1296 | }; | |
1297 | ||
1298 | /* | |
1299 | * Tape discipline structure for 3480 and 3490. | |
1300 | */ | |
1301 | static struct tape_discipline tape_discipline_34xx = { | |
1302 | .owner = THIS_MODULE, | |
1303 | .setup_device = tape_34xx_setup_device, | |
1304 | .cleanup_device = tape_34xx_cleanup_device, | |
1305 | .process_eov = tape_std_process_eov, | |
1306 | .irq = tape_34xx_irq, | |
1307 | .read_block = tape_std_read_block, | |
1308 | .write_block = tape_std_write_block, | |
1309 | #ifdef CONFIG_S390_TAPE_BLOCK | |
1310 | .bread = tape_34xx_bread, | |
1311 | .free_bread = tape_34xx_free_bread, | |
1312 | .check_locate = tape_34xx_check_locate, | |
1313 | #endif | |
1314 | .ioctl_fn = tape_34xx_ioctl, | |
1315 | .mtop_array = tape_34xx_mtop | |
1316 | }; | |
1317 | ||
1318 | static struct ccw_device_id tape_34xx_ids[] = { | |
1319 | { CCW_DEVICE_DEVTYPE(0x3480, 0, 0x3480, 0), driver_info: tape_3480}, | |
1320 | { CCW_DEVICE_DEVTYPE(0x3490, 0, 0x3490, 0), driver_info: tape_3490}, | |
1321 | { /* end of list */ } | |
1322 | }; | |
1323 | ||
1324 | static int | |
1325 | tape_34xx_online(struct ccw_device *cdev) | |
1326 | { | |
1327 | return tape_generic_online( | |
1328 | cdev->dev.driver_data, | |
1329 | &tape_discipline_34xx | |
1330 | ); | |
1331 | } | |
1332 | ||
1333 | static int | |
1334 | tape_34xx_offline(struct ccw_device *cdev) | |
1335 | { | |
1336 | return tape_generic_offline(cdev->dev.driver_data); | |
1337 | } | |
1338 | ||
1339 | static struct ccw_driver tape_34xx_driver = { | |
1340 | .name = "tape_34xx", | |
1341 | .owner = THIS_MODULE, | |
1342 | .ids = tape_34xx_ids, | |
1343 | .probe = tape_generic_probe, | |
1344 | .remove = tape_generic_remove, | |
1345 | .set_online = tape_34xx_online, | |
1346 | .set_offline = tape_34xx_offline, | |
1347 | }; | |
1348 | ||
1349 | static int | |
1350 | tape_34xx_init (void) | |
1351 | { | |
1352 | int rc; | |
1353 | ||
66a464db | 1354 | TAPE_DBF_AREA = debug_register ( "tape_34xx", 2, 2, 4*sizeof(long)); |
1da177e4 LT |
1355 | debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view); |
1356 | #ifdef DBF_LIKE_HELL | |
1357 | debug_set_level(TAPE_DBF_AREA, 6); | |
1358 | #endif | |
1359 | ||
66a464db | 1360 | DBF_EVENT(3, "34xx init: $Revision: 1.23 $\n"); |
1da177e4 LT |
1361 | /* Register driver for 3480/3490 tapes. */ |
1362 | rc = ccw_driver_register(&tape_34xx_driver); | |
1363 | if (rc) | |
1364 | DBF_EVENT(3, "34xx init failed\n"); | |
1365 | else | |
1366 | DBF_EVENT(3, "34xx registered\n"); | |
1367 | return rc; | |
1368 | } | |
1369 | ||
1370 | static void | |
1371 | tape_34xx_exit(void) | |
1372 | { | |
1373 | ccw_driver_unregister(&tape_34xx_driver); | |
1374 | ||
1375 | debug_unregister(TAPE_DBF_AREA); | |
1376 | } | |
1377 | ||
1378 | MODULE_DEVICE_TABLE(ccw, tape_34xx_ids); | |
1379 | MODULE_AUTHOR("(C) 2001-2002 IBM Deutschland Entwicklung GmbH"); | |
1380 | MODULE_DESCRIPTION("Linux on zSeries channel attached 3480 tape " | |
66a464db | 1381 | "device driver ($Revision: 1.23 $)"); |
1da177e4 LT |
1382 | MODULE_LICENSE("GPL"); |
1383 | ||
1384 | module_init(tape_34xx_init); | |
1385 | module_exit(tape_34xx_exit); |