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1da177e4 LT |
1 | /* |
2 | * drivers/s390/char/tape_34xx.c | |
3 | * tape device discipline for 3480/3490 tapes. | |
4 | * | |
b6cba4ee | 5 | * Copyright (C) IBM Corp. 2001,2006 |
1da177e4 LT |
6 | * Author(s): Carsten Otte <cotte@de.ibm.com> |
7 | * Tuan Ngo-Anh <ngoanh@de.ibm.com> | |
8 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
9 | */ | |
10 | ||
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/init.h> | |
13 | #include <linux/bio.h> | |
14 | #include <linux/workqueue.h> | |
15 | ||
16 | #define TAPE_DBF_AREA tape_34xx_dbf | |
17 | ||
18 | #include "tape.h" | |
19 | #include "tape_std.h" | |
20 | ||
21 | #define PRINTK_HEADER "TAPE_34XX: " | |
22 | ||
23 | /* | |
24 | * Pointer to debug area. | |
25 | */ | |
26 | debug_info_t *TAPE_DBF_AREA = NULL; | |
27 | EXPORT_SYMBOL(TAPE_DBF_AREA); | |
28 | ||
1da177e4 LT |
29 | #define TAPE34XX_FMT_3480 0 |
30 | #define TAPE34XX_FMT_3480_2_XF 1 | |
31 | #define TAPE34XX_FMT_3480_XF 2 | |
32 | ||
33 | struct tape_34xx_block_id { | |
34 | unsigned int wrap : 1; | |
35 | unsigned int segment : 7; | |
36 | unsigned int format : 2; | |
37 | unsigned int block : 22; | |
38 | }; | |
39 | ||
40 | /* | |
41 | * A list of block ID's is used to faster seek blocks. | |
42 | */ | |
43 | struct tape_34xx_sbid { | |
44 | struct list_head list; | |
45 | struct tape_34xx_block_id bid; | |
46 | }; | |
47 | ||
48 | static void tape_34xx_delete_sbid_from(struct tape_device *, int); | |
49 | ||
50 | /* | |
51 | * Medium sense for 34xx tapes. There is no 'real' medium sense call. | |
52 | * So we just do a normal sense. | |
53 | */ | |
54 | static int | |
55 | tape_34xx_medium_sense(struct tape_device *device) | |
56 | { | |
57 | struct tape_request *request; | |
58 | unsigned char *sense; | |
59 | int rc; | |
60 | ||
61 | request = tape_alloc_request(1, 32); | |
62 | if (IS_ERR(request)) { | |
63 | DBF_EXCEPTION(6, "MSEN fail\n"); | |
64 | return PTR_ERR(request); | |
65 | } | |
66 | ||
67 | request->op = TO_MSEN; | |
68 | tape_ccw_end(request->cpaddr, SENSE, 32, request->cpdata); | |
69 | ||
70 | rc = tape_do_io_interruptible(device, request); | |
71 | if (request->rc == 0) { | |
72 | sense = request->cpdata; | |
73 | ||
74 | /* | |
75 | * This isn't quite correct. But since INTERVENTION_REQUIRED | |
76 | * means that the drive is 'neither ready nor on-line' it is | |
77 | * only slightly inaccurate to say there is no tape loaded if | |
78 | * the drive isn't online... | |
79 | */ | |
80 | if (sense[0] & SENSE_INTERVENTION_REQUIRED) | |
81 | tape_med_state_set(device, MS_UNLOADED); | |
82 | else | |
83 | tape_med_state_set(device, MS_LOADED); | |
84 | ||
85 | if (sense[1] & SENSE_WRITE_PROTECT) | |
86 | device->tape_generic_status |= GMT_WR_PROT(~0); | |
87 | else | |
88 | device->tape_generic_status &= ~GMT_WR_PROT(~0); | |
89 | } else { | |
90 | DBF_EVENT(4, "tape_34xx: medium sense failed with rc=%d\n", | |
91 | request->rc); | |
92 | } | |
93 | tape_free_request(request); | |
94 | ||
95 | return rc; | |
96 | } | |
97 | ||
98 | /* | |
99 | * These functions are currently used only to schedule a medium_sense for | |
100 | * later execution. This is because we get an interrupt whenever a medium | |
101 | * is inserted but cannot call tape_do_io* from an interrupt context. | |
102 | * Maybe that's useful for other actions we want to start from the | |
103 | * interrupt handler. | |
104 | */ | |
105 | static void | |
106 | tape_34xx_work_handler(void *data) | |
107 | { | |
108 | struct { | |
109 | struct tape_device *device; | |
110 | enum tape_op op; | |
111 | struct work_struct work; | |
112 | } *p = data; | |
113 | ||
114 | switch(p->op) { | |
115 | case TO_MSEN: | |
116 | tape_34xx_medium_sense(p->device); | |
117 | break; | |
118 | default: | |
119 | DBF_EVENT(3, "T34XX: internal error: unknown work\n"); | |
120 | } | |
121 | ||
122 | p->device = tape_put_device(p->device); | |
123 | kfree(p); | |
124 | } | |
125 | ||
126 | static int | |
127 | tape_34xx_schedule_work(struct tape_device *device, enum tape_op op) | |
128 | { | |
129 | struct { | |
130 | struct tape_device *device; | |
131 | enum tape_op op; | |
132 | struct work_struct work; | |
133 | } *p; | |
134 | ||
135 | if ((p = kmalloc(sizeof(*p), GFP_ATOMIC)) == NULL) | |
136 | return -ENOMEM; | |
137 | ||
138 | memset(p, 0, sizeof(*p)); | |
139 | INIT_WORK(&p->work, tape_34xx_work_handler, p); | |
140 | ||
141 | p->device = tape_get_device_reference(device); | |
142 | p->op = op; | |
143 | ||
144 | schedule_work(&p->work); | |
145 | return 0; | |
146 | } | |
147 | ||
148 | /* | |
149 | * Done Handler is called when dev stat = DEVICE-END (successful operation) | |
150 | */ | |
151 | static inline int | |
152 | tape_34xx_done(struct tape_request *request) | |
153 | { | |
154 | DBF_EVENT(6, "%s done\n", tape_op_verbose[request->op]); | |
155 | ||
156 | switch (request->op) { | |
157 | case TO_DSE: | |
158 | case TO_RUN: | |
159 | case TO_WRI: | |
160 | case TO_WTM: | |
161 | case TO_ASSIGN: | |
162 | case TO_UNASSIGN: | |
163 | tape_34xx_delete_sbid_from(request->device, 0); | |
164 | break; | |
165 | default: | |
166 | ; | |
167 | } | |
168 | return TAPE_IO_SUCCESS; | |
169 | } | |
170 | ||
171 | static inline int | |
172 | tape_34xx_erp_failed(struct tape_request *request, int rc) | |
173 | { | |
174 | DBF_EVENT(3, "Error recovery failed for %s (RC=%d)\n", | |
175 | tape_op_verbose[request->op], rc); | |
176 | return rc; | |
177 | } | |
178 | ||
179 | static inline int | |
180 | tape_34xx_erp_succeeded(struct tape_request *request) | |
181 | { | |
182 | DBF_EVENT(3, "Error Recovery successful for %s\n", | |
183 | tape_op_verbose[request->op]); | |
184 | return tape_34xx_done(request); | |
185 | } | |
186 | ||
187 | static inline int | |
188 | tape_34xx_erp_retry(struct tape_request *request) | |
189 | { | |
190 | DBF_EVENT(3, "xerp retr %s\n", tape_op_verbose[request->op]); | |
191 | return TAPE_IO_RETRY; | |
192 | } | |
193 | ||
194 | /* | |
195 | * This function is called, when no request is outstanding and we get an | |
196 | * interrupt | |
197 | */ | |
198 | static int | |
199 | tape_34xx_unsolicited_irq(struct tape_device *device, struct irb *irb) | |
200 | { | |
201 | if (irb->scsw.dstat == 0x85 /* READY */) { | |
202 | /* A medium was inserted in the drive. */ | |
203 | DBF_EVENT(6, "xuud med\n"); | |
204 | tape_34xx_delete_sbid_from(device, 0); | |
205 | tape_34xx_schedule_work(device, TO_MSEN); | |
206 | } else { | |
207 | DBF_EVENT(3, "unsol.irq! dev end: %08x\n", device->cdev_id); | |
208 | PRINT_WARN("Unsolicited IRQ (Device End) caught.\n"); | |
209 | tape_dump_sense(device, NULL, irb); | |
210 | } | |
211 | return TAPE_IO_SUCCESS; | |
212 | } | |
213 | ||
214 | /* | |
215 | * Read Opposite Error Recovery Function: | |
216 | * Used, when Read Forward does not work | |
217 | */ | |
218 | static int | |
219 | tape_34xx_erp_read_opposite(struct tape_device *device, | |
220 | struct tape_request *request) | |
221 | { | |
222 | if (request->op == TO_RFO) { | |
223 | /* | |
224 | * We did read forward, but the data could not be read | |
225 | * *correctly*. We transform the request to a read backward | |
226 | * and try again. | |
227 | */ | |
228 | tape_std_read_backward(device, request); | |
229 | return tape_34xx_erp_retry(request); | |
230 | } | |
231 | if (request->op != TO_RBA) | |
232 | PRINT_ERR("read_opposite called with state:%s\n", | |
233 | tape_op_verbose[request->op]); | |
234 | /* | |
235 | * We tried to read forward and backward, but hat no | |
236 | * success -> failed. | |
237 | */ | |
238 | return tape_34xx_erp_failed(request, -EIO); | |
239 | } | |
240 | ||
241 | static int | |
242 | tape_34xx_erp_bug(struct tape_device *device, struct tape_request *request, | |
243 | struct irb *irb, int no) | |
244 | { | |
245 | if (request->op != TO_ASSIGN) { | |
246 | PRINT_WARN("An unexpected condition #%d was caught in " | |
247 | "tape error recovery.\n", no); | |
248 | PRINT_WARN("Please report this incident.\n"); | |
249 | if (request) | |
250 | PRINT_WARN("Operation of tape:%s\n", | |
251 | tape_op_verbose[request->op]); | |
252 | tape_dump_sense(device, request, irb); | |
253 | } | |
254 | return tape_34xx_erp_failed(request, -EIO); | |
255 | } | |
256 | ||
257 | /* | |
258 | * Handle data overrun between cu and drive. The channel speed might | |
259 | * be too slow. | |
260 | */ | |
261 | static int | |
262 | tape_34xx_erp_overrun(struct tape_device *device, struct tape_request *request, | |
263 | struct irb *irb) | |
264 | { | |
265 | if (irb->ecw[3] == 0x40) { | |
266 | PRINT_WARN ("Data overrun error between control-unit " | |
267 | "and drive. Use a faster channel connection, " | |
268 | "if possible! \n"); | |
269 | return tape_34xx_erp_failed(request, -EIO); | |
270 | } | |
271 | return tape_34xx_erp_bug(device, request, irb, -1); | |
272 | } | |
273 | ||
274 | /* | |
275 | * Handle record sequence error. | |
276 | */ | |
277 | static int | |
278 | tape_34xx_erp_sequence(struct tape_device *device, | |
279 | struct tape_request *request, struct irb *irb) | |
280 | { | |
281 | if (irb->ecw[3] == 0x41) { | |
282 | /* | |
283 | * cu detected incorrect block-id sequence on tape. | |
284 | */ | |
285 | PRINT_WARN("Illegal block-id sequence found!\n"); | |
286 | return tape_34xx_erp_failed(request, -EIO); | |
287 | } | |
288 | /* | |
289 | * Record sequence error bit is set, but erpa does not | |
290 | * show record sequence error. | |
291 | */ | |
292 | return tape_34xx_erp_bug(device, request, irb, -2); | |
293 | } | |
294 | ||
295 | /* | |
296 | * This function analyses the tape's sense-data in case of a unit-check. | |
297 | * If possible, it tries to recover from the error. Else the user is | |
298 | * informed about the problem. | |
299 | */ | |
300 | static int | |
301 | tape_34xx_unit_check(struct tape_device *device, struct tape_request *request, | |
302 | struct irb *irb) | |
303 | { | |
304 | int inhibit_cu_recovery; | |
305 | __u8* sense; | |
306 | ||
307 | inhibit_cu_recovery = (*device->modeset_byte & 0x80) ? 1 : 0; | |
308 | sense = irb->ecw; | |
309 | ||
310 | #ifdef CONFIG_S390_TAPE_BLOCK | |
311 | if (request->op == TO_BLOCK) { | |
312 | /* | |
313 | * Recovery for block device requests. Set the block_position | |
314 | * to something invalid and retry. | |
315 | */ | |
316 | device->blk_data.block_position = -1; | |
317 | if (request->retries-- <= 0) | |
318 | return tape_34xx_erp_failed(request, -EIO); | |
319 | else | |
320 | return tape_34xx_erp_retry(request); | |
321 | } | |
322 | #endif | |
323 | ||
324 | if ( | |
325 | sense[0] & SENSE_COMMAND_REJECT && | |
326 | sense[1] & SENSE_WRITE_PROTECT | |
327 | ) { | |
328 | if ( | |
329 | request->op == TO_DSE || | |
330 | request->op == TO_WRI || | |
331 | request->op == TO_WTM | |
332 | ) { | |
333 | /* medium is write protected */ | |
334 | return tape_34xx_erp_failed(request, -EACCES); | |
335 | } else { | |
336 | return tape_34xx_erp_bug(device, request, irb, -3); | |
337 | } | |
338 | } | |
339 | ||
340 | /* | |
341 | * Special cases for various tape-states when reaching | |
342 | * end of recorded area | |
343 | * | |
344 | * FIXME: Maybe a special case of the special case: | |
345 | * sense[0] == SENSE_EQUIPMENT_CHECK && | |
346 | * sense[1] == SENSE_DRIVE_ONLINE && | |
347 | * sense[3] == 0x47 (Volume Fenced) | |
348 | * | |
349 | * This was caused by continued FSF or FSR after an | |
350 | * 'End Of Data'. | |
351 | */ | |
352 | if (( | |
353 | sense[0] == SENSE_DATA_CHECK || | |
354 | sense[0] == SENSE_EQUIPMENT_CHECK || | |
355 | sense[0] == SENSE_EQUIPMENT_CHECK + SENSE_DEFERRED_UNIT_CHECK | |
356 | ) && ( | |
357 | sense[1] == SENSE_DRIVE_ONLINE || | |
358 | sense[1] == SENSE_BEGINNING_OF_TAPE + SENSE_WRITE_MODE | |
359 | )) { | |
360 | switch (request->op) { | |
361 | /* | |
362 | * sense[0] == SENSE_DATA_CHECK && | |
363 | * sense[1] == SENSE_DRIVE_ONLINE | |
364 | * sense[3] == 0x36 (End Of Data) | |
365 | * | |
366 | * Further seeks might return a 'Volume Fenced'. | |
367 | */ | |
368 | case TO_FSF: | |
369 | case TO_FSB: | |
370 | /* Trying to seek beyond end of recorded area */ | |
371 | return tape_34xx_erp_failed(request, -ENOSPC); | |
372 | case TO_BSB: | |
373 | return tape_34xx_erp_retry(request); | |
374 | ||
375 | /* | |
376 | * sense[0] == SENSE_DATA_CHECK && | |
377 | * sense[1] == SENSE_DRIVE_ONLINE && | |
378 | * sense[3] == 0x36 (End Of Data) | |
379 | */ | |
380 | case TO_LBL: | |
381 | /* Block could not be located. */ | |
382 | tape_34xx_delete_sbid_from(device, 0); | |
383 | return tape_34xx_erp_failed(request, -EIO); | |
384 | ||
385 | case TO_RFO: | |
386 | /* Read beyond end of recorded area -> 0 bytes read */ | |
387 | return tape_34xx_erp_failed(request, 0); | |
388 | ||
389 | /* | |
390 | * sense[0] == SENSE_EQUIPMENT_CHECK && | |
391 | * sense[1] == SENSE_DRIVE_ONLINE && | |
392 | * sense[3] == 0x38 (Physical End Of Volume) | |
393 | */ | |
394 | case TO_WRI: | |
395 | /* Writing at physical end of volume */ | |
396 | return tape_34xx_erp_failed(request, -ENOSPC); | |
397 | default: | |
398 | PRINT_ERR("Invalid op in %s:%i\n", | |
399 | __FUNCTION__, __LINE__); | |
400 | return tape_34xx_erp_failed(request, 0); | |
401 | } | |
402 | } | |
403 | ||
404 | /* Sensing special bits */ | |
405 | if (sense[0] & SENSE_BUS_OUT_CHECK) | |
406 | return tape_34xx_erp_retry(request); | |
407 | ||
408 | if (sense[0] & SENSE_DATA_CHECK) { | |
409 | /* | |
410 | * hardware failure, damaged tape or improper | |
411 | * operating conditions | |
412 | */ | |
413 | switch (sense[3]) { | |
414 | case 0x23: | |
415 | /* a read data check occurred */ | |
416 | if ((sense[2] & SENSE_TAPE_SYNC_MODE) || | |
417 | inhibit_cu_recovery) | |
418 | // data check is not permanent, may be | |
419 | // recovered. We always use async-mode with | |
420 | // cu-recovery, so this should *never* happen. | |
421 | return tape_34xx_erp_bug(device, request, | |
422 | irb, -4); | |
423 | ||
424 | /* data check is permanent, CU recovery has failed */ | |
425 | PRINT_WARN("Permanent read error\n"); | |
426 | return tape_34xx_erp_failed(request, -EIO); | |
427 | case 0x25: | |
428 | // a write data check occurred | |
429 | if ((sense[2] & SENSE_TAPE_SYNC_MODE) || | |
430 | inhibit_cu_recovery) | |
431 | // data check is not permanent, may be | |
432 | // recovered. We always use async-mode with | |
433 | // cu-recovery, so this should *never* happen. | |
434 | return tape_34xx_erp_bug(device, request, | |
435 | irb, -5); | |
436 | ||
437 | // data check is permanent, cu-recovery has failed | |
438 | PRINT_WARN("Permanent write error\n"); | |
439 | return tape_34xx_erp_failed(request, -EIO); | |
440 | case 0x26: | |
441 | /* Data Check (read opposite) occurred. */ | |
442 | return tape_34xx_erp_read_opposite(device, request); | |
443 | case 0x28: | |
444 | /* ID-Mark at tape start couldn't be written */ | |
445 | PRINT_WARN("ID-Mark could not be written.\n"); | |
446 | return tape_34xx_erp_failed(request, -EIO); | |
447 | case 0x31: | |
448 | /* Tape void. Tried to read beyond end of device. */ | |
449 | PRINT_WARN("Read beyond end of recorded area.\n"); | |
450 | return tape_34xx_erp_failed(request, -ENOSPC); | |
451 | case 0x41: | |
452 | /* Record sequence error. */ | |
453 | PRINT_WARN("Invalid block-id sequence found.\n"); | |
454 | return tape_34xx_erp_failed(request, -EIO); | |
455 | default: | |
456 | /* all data checks for 3480 should result in one of | |
457 | * the above erpa-codes. For 3490, other data-check | |
458 | * conditions do exist. */ | |
459 | if (device->cdev->id.driver_info == tape_3480) | |
460 | return tape_34xx_erp_bug(device, request, | |
461 | irb, -6); | |
462 | } | |
463 | } | |
464 | ||
465 | if (sense[0] & SENSE_OVERRUN) | |
466 | return tape_34xx_erp_overrun(device, request, irb); | |
467 | ||
468 | if (sense[1] & SENSE_RECORD_SEQUENCE_ERR) | |
469 | return tape_34xx_erp_sequence(device, request, irb); | |
470 | ||
471 | /* Sensing erpa codes */ | |
472 | switch (sense[3]) { | |
473 | case 0x00: | |
474 | /* Unit check with erpa code 0. Report and ignore. */ | |
475 | PRINT_WARN("Non-error sense was found. " | |
476 | "Unit-check will be ignored.\n"); | |
477 | return TAPE_IO_SUCCESS; | |
478 | case 0x21: | |
479 | /* | |
480 | * Data streaming not operational. CU will switch to | |
481 | * interlock mode. Reissue the command. | |
482 | */ | |
483 | PRINT_WARN("Data streaming not operational. " | |
484 | "Switching to interlock-mode.\n"); | |
485 | return tape_34xx_erp_retry(request); | |
486 | case 0x22: | |
487 | /* | |
488 | * Path equipment check. Might be drive adapter error, buffer | |
489 | * error on the lower interface, internal path not usable, | |
490 | * or error during cartridge load. | |
491 | */ | |
492 | PRINT_WARN("A path equipment check occurred. One of the " | |
493 | "following conditions occurred:\n"); | |
494 | PRINT_WARN("drive adapter error, buffer error on the lower " | |
495 | "interface, internal path not usable, error " | |
496 | "during cartridge load.\n"); | |
497 | return tape_34xx_erp_failed(request, -EIO); | |
498 | case 0x24: | |
499 | /* | |
500 | * Load display check. Load display was command was issued, | |
501 | * but the drive is displaying a drive check message. Can | |
502 | * be threated as "device end". | |
503 | */ | |
504 | return tape_34xx_erp_succeeded(request); | |
505 | case 0x27: | |
506 | /* | |
507 | * Command reject. May indicate illegal channel program or | |
508 | * buffer over/underrun. Since all channel programs are | |
509 | * issued by this driver and ought be correct, we assume a | |
510 | * over/underrun situation and retry the channel program. | |
511 | */ | |
512 | return tape_34xx_erp_retry(request); | |
513 | case 0x29: | |
514 | /* | |
515 | * Function incompatible. Either the tape is idrc compressed | |
516 | * but the hardware isn't capable to do idrc, or a perform | |
517 | * subsystem func is issued and the CU is not on-line. | |
518 | */ | |
519 | PRINT_WARN ("Function incompatible. Try to switch off idrc\n"); | |
520 | return tape_34xx_erp_failed(request, -EIO); | |
521 | case 0x2a: | |
522 | /* | |
523 | * Unsolicited environmental data. An internal counter | |
524 | * overflows, we can ignore this and reissue the cmd. | |
525 | */ | |
526 | return tape_34xx_erp_retry(request); | |
527 | case 0x2b: | |
528 | /* | |
529 | * Environmental data present. Indicates either unload | |
530 | * completed ok or read buffered log command completed ok. | |
531 | */ | |
532 | if (request->op == TO_RUN) { | |
533 | /* Rewind unload completed ok. */ | |
534 | tape_med_state_set(device, MS_UNLOADED); | |
535 | return tape_34xx_erp_succeeded(request); | |
536 | } | |
537 | /* tape_34xx doesn't use read buffered log commands. */ | |
538 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
539 | case 0x2c: | |
540 | /* | |
541 | * Permanent equipment check. CU has tried recovery, but | |
542 | * did not succeed. | |
543 | */ | |
544 | return tape_34xx_erp_failed(request, -EIO); | |
545 | case 0x2d: | |
546 | /* Data security erase failure. */ | |
547 | if (request->op == TO_DSE) | |
548 | return tape_34xx_erp_failed(request, -EIO); | |
549 | /* Data security erase failure, but no such command issued. */ | |
550 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
551 | case 0x2e: | |
552 | /* | |
553 | * Not capable. This indicates either that the drive fails | |
554 | * reading the format id mark or that that format specified | |
555 | * is not supported by the drive. | |
556 | */ | |
557 | PRINT_WARN("Drive not capable processing the tape format!\n"); | |
558 | return tape_34xx_erp_failed(request, -EMEDIUMTYPE); | |
559 | case 0x30: | |
560 | /* The medium is write protected. */ | |
561 | PRINT_WARN("Medium is write protected!\n"); | |
562 | return tape_34xx_erp_failed(request, -EACCES); | |
563 | case 0x32: | |
564 | // Tension loss. We cannot recover this, it's an I/O error. | |
565 | PRINT_WARN("The drive lost tape tension.\n"); | |
566 | return tape_34xx_erp_failed(request, -EIO); | |
567 | case 0x33: | |
568 | /* | |
569 | * Load Failure. The cartridge was not inserted correctly or | |
570 | * the tape is not threaded correctly. | |
571 | */ | |
572 | PRINT_WARN("Cartridge load failure. Reload the cartridge " | |
573 | "and try again.\n"); | |
574 | tape_34xx_delete_sbid_from(device, 0); | |
575 | return tape_34xx_erp_failed(request, -EIO); | |
576 | case 0x34: | |
577 | /* | |
578 | * Unload failure. The drive cannot maintain tape tension | |
579 | * and control tape movement during an unload operation. | |
580 | */ | |
581 | PRINT_WARN("Failure during cartridge unload. " | |
582 | "Please try manually.\n"); | |
583 | if (request->op == TO_RUN) | |
584 | return tape_34xx_erp_failed(request, -EIO); | |
585 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
586 | case 0x35: | |
587 | /* | |
588 | * Drive equipment check. One of the following: | |
589 | * - cu cannot recover from a drive detected error | |
590 | * - a check code message is shown on drive display | |
591 | * - the cartridge loader does not respond correctly | |
592 | * - a failure occurs during an index, load, or unload cycle | |
593 | */ | |
594 | PRINT_WARN("Equipment check! Please check the drive and " | |
595 | "the cartridge loader.\n"); | |
596 | return tape_34xx_erp_failed(request, -EIO); | |
597 | case 0x36: | |
598 | if (device->cdev->id.driver_info == tape_3490) | |
599 | /* End of data. */ | |
600 | return tape_34xx_erp_failed(request, -EIO); | |
601 | /* This erpa is reserved for 3480 */ | |
602 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
603 | case 0x37: | |
604 | /* | |
605 | * Tape length error. The tape is shorter than reported in | |
606 | * the beginning-of-tape data. | |
607 | */ | |
608 | PRINT_WARN("Tape length error.\n"); | |
609 | return tape_34xx_erp_failed(request, -EIO); | |
610 | case 0x38: | |
611 | /* | |
612 | * Physical end of tape. A read/write operation reached | |
613 | * the physical end of tape. | |
614 | */ | |
615 | if (request->op==TO_WRI || | |
616 | request->op==TO_DSE || | |
617 | request->op==TO_WTM) | |
618 | return tape_34xx_erp_failed(request, -ENOSPC); | |
619 | return tape_34xx_erp_failed(request, -EIO); | |
620 | case 0x39: | |
621 | /* Backward at Beginning of tape. */ | |
622 | return tape_34xx_erp_failed(request, -EIO); | |
623 | case 0x3a: | |
624 | /* Drive switched to not ready. */ | |
625 | PRINT_WARN("Drive not ready. Turn the ready/not ready switch " | |
626 | "to ready position and try again.\n"); | |
627 | return tape_34xx_erp_failed(request, -EIO); | |
628 | case 0x3b: | |
629 | /* Manual rewind or unload. This causes an I/O error. */ | |
630 | PRINT_WARN("Medium was rewound or unloaded manually.\n"); | |
631 | tape_34xx_delete_sbid_from(device, 0); | |
632 | return tape_34xx_erp_failed(request, -EIO); | |
633 | case 0x42: | |
634 | /* | |
635 | * Degraded mode. A condition that can cause degraded | |
636 | * performance is detected. | |
637 | */ | |
638 | PRINT_WARN("Subsystem is running in degraded mode.\n"); | |
639 | return tape_34xx_erp_retry(request); | |
640 | case 0x43: | |
641 | /* Drive not ready. */ | |
642 | tape_34xx_delete_sbid_from(device, 0); | |
643 | tape_med_state_set(device, MS_UNLOADED); | |
644 | /* Some commands commands are successful even in this case */ | |
645 | if (sense[1] & SENSE_DRIVE_ONLINE) { | |
646 | switch(request->op) { | |
647 | case TO_ASSIGN: | |
648 | case TO_UNASSIGN: | |
649 | case TO_DIS: | |
650 | case TO_NOP: | |
651 | return tape_34xx_done(request); | |
652 | break; | |
653 | default: | |
654 | break; | |
655 | } | |
656 | } | |
657 | PRINT_WARN("The drive is not ready.\n"); | |
658 | return tape_34xx_erp_failed(request, -ENOMEDIUM); | |
659 | case 0x44: | |
660 | /* Locate Block unsuccessful. */ | |
661 | if (request->op != TO_BLOCK && request->op != TO_LBL) | |
662 | /* No locate block was issued. */ | |
663 | return tape_34xx_erp_bug(device, request, | |
664 | irb, sense[3]); | |
665 | return tape_34xx_erp_failed(request, -EIO); | |
666 | case 0x45: | |
667 | /* The drive is assigned to a different channel path. */ | |
668 | PRINT_WARN("The drive is assigned elsewhere.\n"); | |
669 | return tape_34xx_erp_failed(request, -EIO); | |
670 | case 0x46: | |
671 | /* | |
672 | * Drive not on-line. Drive may be switched offline, | |
673 | * the power supply may be switched off or | |
674 | * the drive address may not be set correctly. | |
675 | */ | |
676 | PRINT_WARN("The drive is not on-line."); | |
677 | return tape_34xx_erp_failed(request, -EIO); | |
678 | case 0x47: | |
679 | /* Volume fenced. CU reports volume integrity is lost. */ | |
680 | PRINT_WARN("Volume fenced. The volume integrity is lost.\n"); | |
681 | tape_34xx_delete_sbid_from(device, 0); | |
682 | return tape_34xx_erp_failed(request, -EIO); | |
683 | case 0x48: | |
684 | /* Log sense data and retry request. */ | |
685 | return tape_34xx_erp_retry(request); | |
686 | case 0x49: | |
687 | /* Bus out check. A parity check error on the bus was found. */ | |
688 | PRINT_WARN("Bus out check. A data transfer over the bus " | |
689 | "has been corrupted.\n"); | |
690 | return tape_34xx_erp_failed(request, -EIO); | |
691 | case 0x4a: | |
692 | /* Control unit erp failed. */ | |
693 | PRINT_WARN("The control unit I/O error recovery failed.\n"); | |
694 | return tape_34xx_erp_failed(request, -EIO); | |
695 | case 0x4b: | |
696 | /* | |
697 | * CU and drive incompatible. The drive requests micro-program | |
698 | * patches, which are not available on the CU. | |
699 | */ | |
700 | PRINT_WARN("The drive needs microprogram patches from the " | |
701 | "control unit, which are not available.\n"); | |
702 | return tape_34xx_erp_failed(request, -EIO); | |
703 | case 0x4c: | |
704 | /* | |
705 | * Recovered Check-One failure. Cu develops a hardware error, | |
706 | * but is able to recover. | |
707 | */ | |
708 | return tape_34xx_erp_retry(request); | |
709 | case 0x4d: | |
710 | if (device->cdev->id.driver_info == tape_3490) | |
711 | /* | |
712 | * Resetting event received. Since the driver does | |
713 | * not support resetting event recovery (which has to | |
714 | * be handled by the I/O Layer), retry our command. | |
715 | */ | |
716 | return tape_34xx_erp_retry(request); | |
717 | /* This erpa is reserved for 3480. */ | |
718 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
719 | case 0x4e: | |
720 | if (device->cdev->id.driver_info == tape_3490) { | |
721 | /* | |
722 | * Maximum block size exceeded. This indicates, that | |
723 | * the block to be written is larger than allowed for | |
724 | * buffered mode. | |
725 | */ | |
726 | PRINT_WARN("Maximum block size for buffered " | |
727 | "mode exceeded.\n"); | |
728 | return tape_34xx_erp_failed(request, -ENOBUFS); | |
729 | } | |
730 | /* This erpa is reserved for 3480. */ | |
731 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
732 | case 0x50: | |
733 | /* | |
734 | * Read buffered log (Overflow). CU is running in extended | |
735 | * buffered log mode, and a counter overflows. This should | |
736 | * never happen, since we're never running in extended | |
737 | * buffered log mode. | |
738 | */ | |
739 | return tape_34xx_erp_retry(request); | |
740 | case 0x51: | |
741 | /* | |
742 | * Read buffered log (EOV). EOF processing occurs while the | |
743 | * CU is in extended buffered log mode. This should never | |
744 | * happen, since we're never running in extended buffered | |
745 | * log mode. | |
746 | */ | |
747 | return tape_34xx_erp_retry(request); | |
748 | case 0x52: | |
749 | /* End of Volume complete. Rewind unload completed ok. */ | |
750 | if (request->op == TO_RUN) { | |
751 | tape_med_state_set(device, MS_UNLOADED); | |
752 | tape_34xx_delete_sbid_from(device, 0); | |
753 | return tape_34xx_erp_succeeded(request); | |
754 | } | |
755 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
756 | case 0x53: | |
757 | /* Global command intercept. */ | |
758 | return tape_34xx_erp_retry(request); | |
759 | case 0x54: | |
760 | /* Channel interface recovery (temporary). */ | |
761 | return tape_34xx_erp_retry(request); | |
762 | case 0x55: | |
763 | /* Channel interface recovery (permanent). */ | |
764 | PRINT_WARN("A permanent channel interface error occurred.\n"); | |
765 | return tape_34xx_erp_failed(request, -EIO); | |
766 | case 0x56: | |
767 | /* Channel protocol error. */ | |
768 | PRINT_WARN("A channel protocol error occurred.\n"); | |
769 | return tape_34xx_erp_failed(request, -EIO); | |
770 | case 0x57: | |
771 | if (device->cdev->id.driver_info == tape_3480) { | |
772 | /* Attention intercept. */ | |
773 | PRINT_WARN("An attention intercept occurred, " | |
774 | "which will be recovered.\n"); | |
775 | return tape_34xx_erp_retry(request); | |
776 | } else { | |
777 | /* Global status intercept. */ | |
778 | PRINT_WARN("An global status intercept was received, " | |
779 | "which will be recovered.\n"); | |
780 | return tape_34xx_erp_retry(request); | |
781 | } | |
782 | case 0x5a: | |
783 | /* | |
784 | * Tape length incompatible. The tape inserted is too long, | |
785 | * which could cause damage to the tape or the drive. | |
786 | */ | |
787 | PRINT_WARN("Tape Length Incompatible\n"); | |
788 | PRINT_WARN("Tape length exceeds IBM enhanced capacity " | |
789 | "cartdridge length or a medium\n"); | |
790 | PRINT_WARN("with EC-CST identification mark has been mounted " | |
791 | "in a device that writes\n"); | |
792 | PRINT_WARN("3480 or 3480 XF format.\n"); | |
793 | return tape_34xx_erp_failed(request, -EIO); | |
794 | case 0x5b: | |
795 | /* Format 3480 XF incompatible */ | |
796 | if (sense[1] & SENSE_BEGINNING_OF_TAPE) | |
797 | /* The tape will get overwritten. */ | |
798 | return tape_34xx_erp_retry(request); | |
799 | PRINT_WARN("Format 3480 XF Incompatible\n"); | |
800 | PRINT_WARN("Medium has been created in 3480 format. " | |
801 | "To change the format writes\n"); | |
802 | PRINT_WARN("must be issued at BOT.\n"); | |
803 | return tape_34xx_erp_failed(request, -EIO); | |
804 | case 0x5c: | |
805 | /* Format 3480-2 XF incompatible */ | |
806 | PRINT_WARN("Format 3480-2 XF Incompatible\n"); | |
807 | PRINT_WARN("Device can only read 3480 or 3480 XF format.\n"); | |
808 | return tape_34xx_erp_failed(request, -EIO); | |
809 | case 0x5d: | |
810 | /* Tape length violation. */ | |
811 | PRINT_WARN("Tape Length Violation\n"); | |
812 | PRINT_WARN("The mounted tape exceeds IBM Enhanced Capacity " | |
813 | "Cartdridge System Tape length.\n"); | |
814 | PRINT_WARN("This may cause damage to the drive or tape when " | |
815 | "processing to the EOV\n"); | |
816 | return tape_34xx_erp_failed(request, -EMEDIUMTYPE); | |
817 | case 0x5e: | |
818 | /* Compaction algorithm incompatible. */ | |
819 | PRINT_WARN("Compaction Algorithm Incompatible\n"); | |
820 | PRINT_WARN("The volume is recorded using an incompatible " | |
821 | "compaction algorithm,\n"); | |
822 | PRINT_WARN("which is not supported by the device.\n"); | |
823 | return tape_34xx_erp_failed(request, -EMEDIUMTYPE); | |
824 | ||
825 | /* The following erpas should have been covered earlier. */ | |
826 | case 0x23: /* Read data check. */ | |
827 | case 0x25: /* Write data check. */ | |
828 | case 0x26: /* Data check (read opposite). */ | |
829 | case 0x28: /* Write id mark check. */ | |
830 | case 0x31: /* Tape void. */ | |
831 | case 0x40: /* Overrun error. */ | |
832 | case 0x41: /* Record sequence error. */ | |
833 | /* All other erpas are reserved for future use. */ | |
834 | default: | |
835 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
836 | } | |
837 | } | |
838 | ||
839 | /* | |
840 | * 3480/3490 interrupt handler | |
841 | */ | |
842 | static int | |
843 | tape_34xx_irq(struct tape_device *device, struct tape_request *request, | |
844 | struct irb *irb) | |
845 | { | |
846 | if (request == NULL) | |
847 | return tape_34xx_unsolicited_irq(device, irb); | |
848 | ||
849 | if ((irb->scsw.dstat & DEV_STAT_UNIT_EXCEP) && | |
850 | (irb->scsw.dstat & DEV_STAT_DEV_END) && | |
851 | (request->op == TO_WRI)) { | |
852 | /* Write at end of volume */ | |
853 | PRINT_INFO("End of volume\n"); /* XXX */ | |
854 | return tape_34xx_erp_failed(request, -ENOSPC); | |
855 | } | |
856 | ||
857 | if (irb->scsw.dstat & DEV_STAT_UNIT_CHECK) | |
858 | return tape_34xx_unit_check(device, request, irb); | |
859 | ||
860 | if (irb->scsw.dstat & DEV_STAT_DEV_END) { | |
861 | /* | |
862 | * A unit exception occurs on skipping over a tapemark block. | |
863 | */ | |
864 | if (irb->scsw.dstat & DEV_STAT_UNIT_EXCEP) { | |
865 | if (request->op == TO_BSB || request->op == TO_FSB) | |
866 | request->rescnt++; | |
867 | else | |
868 | DBF_EVENT(5, "Unit Exception!\n"); | |
869 | } | |
870 | return tape_34xx_done(request); | |
871 | } | |
872 | ||
873 | DBF_EVENT(6, "xunknownirq\n"); | |
874 | PRINT_ERR("Unexpected interrupt.\n"); | |
875 | PRINT_ERR("Current op is: %s", tape_op_verbose[request->op]); | |
876 | tape_dump_sense(device, request, irb); | |
877 | return TAPE_IO_STOP; | |
878 | } | |
879 | ||
880 | /* | |
881 | * ioctl_overload | |
882 | */ | |
883 | static int | |
884 | tape_34xx_ioctl(struct tape_device *device, unsigned int cmd, unsigned long arg) | |
885 | { | |
886 | if (cmd == TAPE390_DISPLAY) { | |
887 | struct display_struct disp; | |
888 | ||
889 | if (copy_from_user(&disp, (char __user *) arg, sizeof(disp)) != 0) | |
890 | return -EFAULT; | |
891 | ||
892 | return tape_std_display(device, &disp); | |
893 | } else | |
894 | return -EINVAL; | |
895 | } | |
896 | ||
897 | static inline void | |
898 | tape_34xx_append_new_sbid(struct tape_34xx_block_id bid, struct list_head *l) | |
899 | { | |
900 | struct tape_34xx_sbid * new_sbid; | |
901 | ||
902 | new_sbid = kmalloc(sizeof(*new_sbid), GFP_ATOMIC); | |
903 | if (!new_sbid) | |
904 | return; | |
905 | ||
906 | new_sbid->bid = bid; | |
907 | list_add(&new_sbid->list, l); | |
908 | } | |
909 | ||
910 | /* | |
911 | * Build up the search block ID list. The block ID consists of a logical | |
912 | * block number and a hardware specific part. The hardware specific part | |
913 | * helps the tape drive to speed up searching for a specific block. | |
914 | */ | |
915 | static void | |
916 | tape_34xx_add_sbid(struct tape_device *device, struct tape_34xx_block_id bid) | |
917 | { | |
918 | struct list_head * sbid_list; | |
919 | struct tape_34xx_sbid * sbid; | |
920 | struct list_head * l; | |
921 | ||
922 | /* | |
923 | * immediately return if there is no list at all or the block to add | |
924 | * is located in segment 1 of wrap 0 because this position is used | |
925 | * if no hardware position data is supplied. | |
926 | */ | |
927 | sbid_list = (struct list_head *) device->discdata; | |
928 | if (!sbid_list || (bid.segment < 2 && bid.wrap == 0)) | |
929 | return; | |
930 | ||
931 | /* | |
932 | * Search the position where to insert the new entry. Hardware | |
933 | * acceleration uses only the segment and wrap number. So we | |
934 | * need only one entry for a specific wrap/segment combination. | |
935 | * If there is a block with a lower number but the same hard- | |
936 | * ware position data we just update the block number in the | |
937 | * existing entry. | |
938 | */ | |
939 | list_for_each(l, sbid_list) { | |
940 | sbid = list_entry(l, struct tape_34xx_sbid, list); | |
941 | ||
942 | if ( | |
943 | (sbid->bid.segment == bid.segment) && | |
944 | (sbid->bid.wrap == bid.wrap) | |
945 | ) { | |
946 | if (bid.block < sbid->bid.block) | |
947 | sbid->bid = bid; | |
948 | else return; | |
949 | break; | |
950 | } | |
951 | ||
952 | /* Sort in according to logical block number. */ | |
953 | if (bid.block < sbid->bid.block) { | |
954 | tape_34xx_append_new_sbid(bid, l->prev); | |
955 | break; | |
956 | } | |
957 | } | |
958 | /* List empty or new block bigger than last entry. */ | |
959 | if (l == sbid_list) | |
960 | tape_34xx_append_new_sbid(bid, l->prev); | |
961 | ||
962 | DBF_LH(4, "Current list is:\n"); | |
963 | list_for_each(l, sbid_list) { | |
964 | sbid = list_entry(l, struct tape_34xx_sbid, list); | |
965 | DBF_LH(4, "%d:%03d@%05d\n", | |
966 | sbid->bid.wrap, | |
967 | sbid->bid.segment, | |
968 | sbid->bid.block | |
969 | ); | |
970 | } | |
971 | } | |
972 | ||
973 | /* | |
974 | * Delete all entries from the search block ID list that belong to tape blocks | |
975 | * equal or higher than the given number. | |
976 | */ | |
977 | static void | |
978 | tape_34xx_delete_sbid_from(struct tape_device *device, int from) | |
979 | { | |
980 | struct list_head * sbid_list; | |
981 | struct tape_34xx_sbid * sbid; | |
982 | struct list_head * l; | |
983 | struct list_head * n; | |
984 | ||
985 | sbid_list = (struct list_head *) device->discdata; | |
986 | if (!sbid_list) | |
987 | return; | |
988 | ||
989 | list_for_each_safe(l, n, sbid_list) { | |
990 | sbid = list_entry(l, struct tape_34xx_sbid, list); | |
991 | if (sbid->bid.block >= from) { | |
992 | DBF_LH(4, "Delete sbid %d:%03d@%05d\n", | |
993 | sbid->bid.wrap, | |
994 | sbid->bid.segment, | |
995 | sbid->bid.block | |
996 | ); | |
997 | list_del(l); | |
998 | kfree(sbid); | |
999 | } | |
1000 | } | |
1001 | } | |
1002 | ||
1003 | /* | |
1004 | * Merge hardware position data into a block id. | |
1005 | */ | |
1006 | static void | |
1007 | tape_34xx_merge_sbid( | |
1008 | struct tape_device * device, | |
1009 | struct tape_34xx_block_id * bid | |
1010 | ) { | |
1011 | struct tape_34xx_sbid * sbid; | |
1012 | struct tape_34xx_sbid * sbid_to_use; | |
1013 | struct list_head * sbid_list; | |
1014 | struct list_head * l; | |
1015 | ||
1016 | sbid_list = (struct list_head *) device->discdata; | |
1017 | bid->wrap = 0; | |
1018 | bid->segment = 1; | |
1019 | ||
1020 | if (!sbid_list || list_empty(sbid_list)) | |
1021 | return; | |
1022 | ||
1023 | sbid_to_use = NULL; | |
1024 | list_for_each(l, sbid_list) { | |
1025 | sbid = list_entry(l, struct tape_34xx_sbid, list); | |
1026 | ||
1027 | if (sbid->bid.block >= bid->block) | |
1028 | break; | |
1029 | sbid_to_use = sbid; | |
1030 | } | |
1031 | if (sbid_to_use) { | |
1032 | bid->wrap = sbid_to_use->bid.wrap; | |
1033 | bid->segment = sbid_to_use->bid.segment; | |
1034 | DBF_LH(4, "Use %d:%03d@%05d for %05d\n", | |
1035 | sbid_to_use->bid.wrap, | |
1036 | sbid_to_use->bid.segment, | |
1037 | sbid_to_use->bid.block, | |
1038 | bid->block | |
1039 | ); | |
1040 | } | |
1041 | } | |
1042 | ||
1043 | static int | |
1044 | tape_34xx_setup_device(struct tape_device * device) | |
1045 | { | |
1046 | int rc; | |
1047 | struct list_head * discdata; | |
1048 | ||
1049 | DBF_EVENT(6, "34xx device setup\n"); | |
1050 | if ((rc = tape_std_assign(device)) == 0) { | |
1051 | if ((rc = tape_34xx_medium_sense(device)) != 0) { | |
1052 | DBF_LH(3, "34xx medium sense returned %d\n", rc); | |
1053 | } | |
1054 | } | |
1055 | discdata = kmalloc(sizeof(struct list_head), GFP_KERNEL); | |
1056 | if (discdata) { | |
1057 | INIT_LIST_HEAD(discdata); | |
1058 | device->discdata = discdata; | |
1059 | } | |
1060 | ||
1061 | return rc; | |
1062 | } | |
1063 | ||
1064 | static void | |
1065 | tape_34xx_cleanup_device(struct tape_device *device) | |
1066 | { | |
1067 | tape_std_unassign(device); | |
1068 | ||
1069 | if (device->discdata) { | |
1070 | tape_34xx_delete_sbid_from(device, 0); | |
1071 | kfree(device->discdata); | |
1072 | device->discdata = NULL; | |
1073 | } | |
1074 | } | |
1075 | ||
1076 | ||
1077 | /* | |
1078 | * MTTELL: Tell block. Return the number of block relative to current file. | |
1079 | */ | |
1080 | static int | |
1081 | tape_34xx_mttell(struct tape_device *device, int mt_count) | |
1082 | { | |
1083 | struct { | |
1084 | struct tape_34xx_block_id cbid; | |
1085 | struct tape_34xx_block_id dbid; | |
1086 | } __attribute__ ((packed)) block_id; | |
1087 | int rc; | |
1088 | ||
1089 | rc = tape_std_read_block_id(device, (__u64 *) &block_id); | |
1090 | if (rc) | |
1091 | return rc; | |
1092 | ||
1093 | tape_34xx_add_sbid(device, block_id.cbid); | |
1094 | return block_id.cbid.block; | |
1095 | } | |
1096 | ||
1097 | /* | |
1098 | * MTSEEK: seek to the specified block. | |
1099 | */ | |
1100 | static int | |
1101 | tape_34xx_mtseek(struct tape_device *device, int mt_count) | |
1102 | { | |
1103 | struct tape_request *request; | |
1104 | struct tape_34xx_block_id * bid; | |
1105 | ||
1106 | if (mt_count > 0x3fffff) { | |
1107 | DBF_EXCEPTION(6, "xsee parm\n"); | |
1108 | return -EINVAL; | |
1109 | } | |
1110 | request = tape_alloc_request(3, 4); | |
1111 | if (IS_ERR(request)) | |
1112 | return PTR_ERR(request); | |
1113 | ||
1114 | /* setup ccws */ | |
1115 | request->op = TO_LBL; | |
1116 | bid = (struct tape_34xx_block_id *) request->cpdata; | |
1117 | bid->format = (*device->modeset_byte & 0x08) ? | |
1118 | TAPE34XX_FMT_3480_XF : TAPE34XX_FMT_3480; | |
1119 | bid->block = mt_count; | |
1120 | tape_34xx_merge_sbid(device, bid); | |
1121 | ||
1122 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
1123 | tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata); | |
1124 | tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); | |
1125 | ||
1126 | /* execute it */ | |
1127 | return tape_do_io_free(device, request); | |
1128 | } | |
1129 | ||
1130 | #ifdef CONFIG_S390_TAPE_BLOCK | |
1131 | /* | |
1132 | * Tape block read for 34xx. | |
1133 | */ | |
1134 | static struct tape_request * | |
1135 | tape_34xx_bread(struct tape_device *device, struct request *req) | |
1136 | { | |
1137 | struct tape_request *request; | |
1138 | struct ccw1 *ccw; | |
1139 | int count = 0, i; | |
1140 | unsigned off; | |
1141 | char *dst; | |
1142 | struct bio_vec *bv; | |
1143 | struct bio *bio; | |
1144 | struct tape_34xx_block_id * start_block; | |
1145 | ||
1146 | DBF_EVENT(6, "xBREDid:"); | |
1147 | ||
1148 | /* Count the number of blocks for the request. */ | |
1149 | rq_for_each_bio(bio, req) { | |
1150 | bio_for_each_segment(bv, bio, i) { | |
1151 | count += bv->bv_len >> (TAPEBLOCK_HSEC_S2B + 9); | |
1152 | } | |
1153 | } | |
1154 | ||
1155 | /* Allocate the ccw request. */ | |
1156 | request = tape_alloc_request(3+count+1, 8); | |
1157 | if (IS_ERR(request)) | |
1158 | return request; | |
1159 | ||
1160 | /* Setup ccws. */ | |
1161 | request->op = TO_BLOCK; | |
1162 | start_block = (struct tape_34xx_block_id *) request->cpdata; | |
1163 | start_block->block = req->sector >> TAPEBLOCK_HSEC_S2B; | |
1164 | DBF_EVENT(6, "start_block = %i\n", start_block->block); | |
1165 | ||
1166 | ccw = request->cpaddr; | |
1167 | ccw = tape_ccw_cc(ccw, MODE_SET_DB, 1, device->modeset_byte); | |
1168 | ||
1169 | /* | |
1170 | * We always setup a nop after the mode set ccw. This slot is | |
1171 | * used in tape_std_check_locate to insert a locate ccw if the | |
1172 | * current tape position doesn't match the start block to be read. | |
1173 | * The second nop will be filled with a read block id which is in | |
1174 | * turn used by tape_34xx_free_bread to populate the segment bid | |
1175 | * table. | |
1176 | */ | |
1177 | ccw = tape_ccw_cc(ccw, NOP, 0, NULL); | |
1178 | ccw = tape_ccw_cc(ccw, NOP, 0, NULL); | |
1179 | ||
1180 | rq_for_each_bio(bio, req) { | |
1181 | bio_for_each_segment(bv, bio, i) { | |
1182 | dst = kmap(bv->bv_page) + bv->bv_offset; | |
1183 | for (off = 0; off < bv->bv_len; | |
1184 | off += TAPEBLOCK_HSEC_SIZE) { | |
1185 | ccw->flags = CCW_FLAG_CC; | |
1186 | ccw->cmd_code = READ_FORWARD; | |
1187 | ccw->count = TAPEBLOCK_HSEC_SIZE; | |
1188 | set_normalized_cda(ccw, (void*) __pa(dst)); | |
1189 | ccw++; | |
1190 | dst += TAPEBLOCK_HSEC_SIZE; | |
1191 | } | |
1192 | } | |
1193 | } | |
1194 | ||
1195 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
1196 | DBF_EVENT(6, "xBREDccwg\n"); | |
1197 | return request; | |
1198 | } | |
1199 | ||
1200 | static void | |
1201 | tape_34xx_free_bread (struct tape_request *request) | |
1202 | { | |
1203 | struct ccw1* ccw; | |
1204 | ||
1205 | ccw = request->cpaddr; | |
1206 | if ((ccw + 2)->cmd_code == READ_BLOCK_ID) { | |
1207 | struct { | |
1208 | struct tape_34xx_block_id cbid; | |
1209 | struct tape_34xx_block_id dbid; | |
1210 | } __attribute__ ((packed)) *rbi_data; | |
1211 | ||
1212 | rbi_data = request->cpdata; | |
1213 | ||
1214 | if (request->device) | |
1215 | tape_34xx_add_sbid(request->device, rbi_data->cbid); | |
1216 | } | |
1217 | ||
1218 | /* Last ccw is a nop and doesn't need clear_normalized_cda */ | |
1219 | for (; ccw->flags & CCW_FLAG_CC; ccw++) | |
1220 | if (ccw->cmd_code == READ_FORWARD) | |
1221 | clear_normalized_cda(ccw); | |
1222 | tape_free_request(request); | |
1223 | } | |
1224 | ||
1225 | /* | |
1226 | * check_locate is called just before the tape request is passed to | |
1227 | * the common io layer for execution. It has to check the current | |
1228 | * tape position and insert a locate ccw if it doesn't match the | |
1229 | * start block for the request. | |
1230 | */ | |
1231 | static void | |
1232 | tape_34xx_check_locate(struct tape_device *device, struct tape_request *request) | |
1233 | { | |
1234 | struct tape_34xx_block_id * start_block; | |
1235 | ||
1236 | start_block = (struct tape_34xx_block_id *) request->cpdata; | |
1237 | if (start_block->block == device->blk_data.block_position) | |
1238 | return; | |
1239 | ||
1240 | DBF_LH(4, "Block seek(%06d+%06d)\n", start_block->block, device->bof); | |
1241 | start_block->wrap = 0; | |
1242 | start_block->segment = 1; | |
1243 | start_block->format = (*device->modeset_byte & 0x08) ? | |
1244 | TAPE34XX_FMT_3480_XF : | |
1245 | TAPE34XX_FMT_3480; | |
1246 | start_block->block = start_block->block + device->bof; | |
1247 | tape_34xx_merge_sbid(device, start_block); | |
1248 | tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata); | |
1249 | tape_ccw_cc(request->cpaddr + 2, READ_BLOCK_ID, 8, request->cpdata); | |
1250 | } | |
1251 | #endif | |
1252 | ||
1253 | /* | |
1254 | * List of 3480/3490 magnetic tape commands. | |
1255 | */ | |
1256 | static tape_mtop_fn tape_34xx_mtop[TAPE_NR_MTOPS] = { | |
1257 | [MTRESET] = tape_std_mtreset, | |
1258 | [MTFSF] = tape_std_mtfsf, | |
1259 | [MTBSF] = tape_std_mtbsf, | |
1260 | [MTFSR] = tape_std_mtfsr, | |
1261 | [MTBSR] = tape_std_mtbsr, | |
1262 | [MTWEOF] = tape_std_mtweof, | |
1263 | [MTREW] = tape_std_mtrew, | |
1264 | [MTOFFL] = tape_std_mtoffl, | |
1265 | [MTNOP] = tape_std_mtnop, | |
1266 | [MTRETEN] = tape_std_mtreten, | |
1267 | [MTBSFM] = tape_std_mtbsfm, | |
1268 | [MTFSFM] = tape_std_mtfsfm, | |
1269 | [MTEOM] = tape_std_mteom, | |
1270 | [MTERASE] = tape_std_mterase, | |
1271 | [MTRAS1] = NULL, | |
1272 | [MTRAS2] = NULL, | |
1273 | [MTRAS3] = NULL, | |
1274 | [MTSETBLK] = tape_std_mtsetblk, | |
1275 | [MTSETDENSITY] = NULL, | |
1276 | [MTSEEK] = tape_34xx_mtseek, | |
1277 | [MTTELL] = tape_34xx_mttell, | |
1278 | [MTSETDRVBUFFER] = NULL, | |
1279 | [MTFSS] = NULL, | |
1280 | [MTBSS] = NULL, | |
1281 | [MTWSM] = NULL, | |
1282 | [MTLOCK] = NULL, | |
1283 | [MTUNLOCK] = NULL, | |
1284 | [MTLOAD] = tape_std_mtload, | |
1285 | [MTUNLOAD] = tape_std_mtunload, | |
1286 | [MTCOMPRESSION] = tape_std_mtcompression, | |
1287 | [MTSETPART] = NULL, | |
1288 | [MTMKPART] = NULL | |
1289 | }; | |
1290 | ||
1291 | /* | |
1292 | * Tape discipline structure for 3480 and 3490. | |
1293 | */ | |
1294 | static struct tape_discipline tape_discipline_34xx = { | |
1295 | .owner = THIS_MODULE, | |
1296 | .setup_device = tape_34xx_setup_device, | |
1297 | .cleanup_device = tape_34xx_cleanup_device, | |
1298 | .process_eov = tape_std_process_eov, | |
1299 | .irq = tape_34xx_irq, | |
1300 | .read_block = tape_std_read_block, | |
1301 | .write_block = tape_std_write_block, | |
1302 | #ifdef CONFIG_S390_TAPE_BLOCK | |
1303 | .bread = tape_34xx_bread, | |
1304 | .free_bread = tape_34xx_free_bread, | |
1305 | .check_locate = tape_34xx_check_locate, | |
1306 | #endif | |
1307 | .ioctl_fn = tape_34xx_ioctl, | |
1308 | .mtop_array = tape_34xx_mtop | |
1309 | }; | |
1310 | ||
1311 | static struct ccw_device_id tape_34xx_ids[] = { | |
d2c993d8 HC |
1312 | { CCW_DEVICE_DEVTYPE(0x3480, 0, 0x3480, 0), .driver_info = tape_3480}, |
1313 | { CCW_DEVICE_DEVTYPE(0x3490, 0, 0x3490, 0), .driver_info = tape_3490}, | |
1314 | { /* end of list */ }, | |
1da177e4 LT |
1315 | }; |
1316 | ||
1317 | static int | |
1318 | tape_34xx_online(struct ccw_device *cdev) | |
1319 | { | |
1320 | return tape_generic_online( | |
1321 | cdev->dev.driver_data, | |
1322 | &tape_discipline_34xx | |
1323 | ); | |
1324 | } | |
1325 | ||
1326 | static int | |
1327 | tape_34xx_offline(struct ccw_device *cdev) | |
1328 | { | |
1329 | return tape_generic_offline(cdev->dev.driver_data); | |
1330 | } | |
1331 | ||
1332 | static struct ccw_driver tape_34xx_driver = { | |
1333 | .name = "tape_34xx", | |
1334 | .owner = THIS_MODULE, | |
1335 | .ids = tape_34xx_ids, | |
1336 | .probe = tape_generic_probe, | |
1337 | .remove = tape_generic_remove, | |
1338 | .set_online = tape_34xx_online, | |
1339 | .set_offline = tape_34xx_offline, | |
1340 | }; | |
1341 | ||
1342 | static int | |
1343 | tape_34xx_init (void) | |
1344 | { | |
1345 | int rc; | |
1346 | ||
66a464db | 1347 | TAPE_DBF_AREA = debug_register ( "tape_34xx", 2, 2, 4*sizeof(long)); |
1da177e4 LT |
1348 | debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view); |
1349 | #ifdef DBF_LIKE_HELL | |
1350 | debug_set_level(TAPE_DBF_AREA, 6); | |
1351 | #endif | |
1352 | ||
e018ba1f | 1353 | DBF_EVENT(3, "34xx init\n"); |
1da177e4 LT |
1354 | /* Register driver for 3480/3490 tapes. */ |
1355 | rc = ccw_driver_register(&tape_34xx_driver); | |
1356 | if (rc) | |
1357 | DBF_EVENT(3, "34xx init failed\n"); | |
1358 | else | |
1359 | DBF_EVENT(3, "34xx registered\n"); | |
1360 | return rc; | |
1361 | } | |
1362 | ||
1363 | static void | |
1364 | tape_34xx_exit(void) | |
1365 | { | |
1366 | ccw_driver_unregister(&tape_34xx_driver); | |
1367 | ||
1368 | debug_unregister(TAPE_DBF_AREA); | |
1369 | } | |
1370 | ||
1371 | MODULE_DEVICE_TABLE(ccw, tape_34xx_ids); | |
1372 | MODULE_AUTHOR("(C) 2001-2002 IBM Deutschland Entwicklung GmbH"); | |
e018ba1f | 1373 | MODULE_DESCRIPTION("Linux on zSeries channel attached 3480 tape device driver"); |
1da177e4 LT |
1374 | MODULE_LICENSE("GPL"); |
1375 | ||
1376 | module_init(tape_34xx_init); | |
1377 | module_exit(tape_34xx_exit); |