Commit | Line | Data |
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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 | ||
c1637532 MS |
98 | struct tape_34xx_work { |
99 | struct tape_device *device; | |
100 | enum tape_op op; | |
101 | struct work_struct work; | |
102 | }; | |
103 | ||
1da177e4 LT |
104 | /* |
105 | * These functions are currently used only to schedule a medium_sense for | |
106 | * later execution. This is because we get an interrupt whenever a medium | |
107 | * is inserted but cannot call tape_do_io* from an interrupt context. | |
108 | * Maybe that's useful for other actions we want to start from the | |
109 | * interrupt handler. | |
110 | */ | |
111 | static void | |
c1637532 | 112 | tape_34xx_work_handler(struct work_struct *work) |
1da177e4 | 113 | { |
c1637532 MS |
114 | struct tape_34xx_work *p = |
115 | container_of(work, struct tape_34xx_work, work); | |
1da177e4 LT |
116 | |
117 | switch(p->op) { | |
118 | case TO_MSEN: | |
119 | tape_34xx_medium_sense(p->device); | |
120 | break; | |
121 | default: | |
122 | DBF_EVENT(3, "T34XX: internal error: unknown work\n"); | |
123 | } | |
124 | ||
125 | p->device = tape_put_device(p->device); | |
126 | kfree(p); | |
127 | } | |
128 | ||
129 | static int | |
130 | tape_34xx_schedule_work(struct tape_device *device, enum tape_op op) | |
131 | { | |
c1637532 | 132 | struct tape_34xx_work *p; |
1da177e4 | 133 | |
dd00cc48 | 134 | if ((p = kzalloc(sizeof(*p), GFP_ATOMIC)) == NULL) |
1da177e4 LT |
135 | return -ENOMEM; |
136 | ||
c1637532 | 137 | INIT_WORK(&p->work, tape_34xx_work_handler); |
1da177e4 LT |
138 | |
139 | p->device = tape_get_device_reference(device); | |
140 | p->op = op; | |
141 | ||
142 | schedule_work(&p->work); | |
143 | return 0; | |
144 | } | |
145 | ||
146 | /* | |
147 | * Done Handler is called when dev stat = DEVICE-END (successful operation) | |
148 | */ | |
149 | static inline int | |
150 | tape_34xx_done(struct tape_request *request) | |
151 | { | |
152 | DBF_EVENT(6, "%s done\n", tape_op_verbose[request->op]); | |
153 | ||
154 | switch (request->op) { | |
155 | case TO_DSE: | |
156 | case TO_RUN: | |
157 | case TO_WRI: | |
158 | case TO_WTM: | |
159 | case TO_ASSIGN: | |
160 | case TO_UNASSIGN: | |
161 | tape_34xx_delete_sbid_from(request->device, 0); | |
162 | break; | |
163 | default: | |
164 | ; | |
165 | } | |
166 | return TAPE_IO_SUCCESS; | |
167 | } | |
168 | ||
169 | static inline int | |
170 | tape_34xx_erp_failed(struct tape_request *request, int rc) | |
171 | { | |
172 | DBF_EVENT(3, "Error recovery failed for %s (RC=%d)\n", | |
173 | tape_op_verbose[request->op], rc); | |
174 | return rc; | |
175 | } | |
176 | ||
177 | static inline int | |
178 | tape_34xx_erp_succeeded(struct tape_request *request) | |
179 | { | |
180 | DBF_EVENT(3, "Error Recovery successful for %s\n", | |
181 | tape_op_verbose[request->op]); | |
182 | return tape_34xx_done(request); | |
183 | } | |
184 | ||
185 | static inline int | |
186 | tape_34xx_erp_retry(struct tape_request *request) | |
187 | { | |
188 | DBF_EVENT(3, "xerp retr %s\n", tape_op_verbose[request->op]); | |
189 | return TAPE_IO_RETRY; | |
190 | } | |
191 | ||
192 | /* | |
193 | * This function is called, when no request is outstanding and we get an | |
194 | * interrupt | |
195 | */ | |
196 | static int | |
197 | tape_34xx_unsolicited_irq(struct tape_device *device, struct irb *irb) | |
198 | { | |
23d805b6 | 199 | if (irb->scsw.cmd.dstat == 0x85) { /* READY */ |
1da177e4 LT |
200 | /* A medium was inserted in the drive. */ |
201 | DBF_EVENT(6, "xuud med\n"); | |
202 | tape_34xx_delete_sbid_from(device, 0); | |
203 | tape_34xx_schedule_work(device, TO_MSEN); | |
204 | } else { | |
205 | DBF_EVENT(3, "unsol.irq! dev end: %08x\n", device->cdev_id); | |
206 | PRINT_WARN("Unsolicited IRQ (Device End) caught.\n"); | |
207 | tape_dump_sense(device, NULL, irb); | |
208 | } | |
209 | return TAPE_IO_SUCCESS; | |
210 | } | |
211 | ||
212 | /* | |
213 | * Read Opposite Error Recovery Function: | |
214 | * Used, when Read Forward does not work | |
215 | */ | |
216 | static int | |
217 | tape_34xx_erp_read_opposite(struct tape_device *device, | |
218 | struct tape_request *request) | |
219 | { | |
220 | if (request->op == TO_RFO) { | |
221 | /* | |
222 | * We did read forward, but the data could not be read | |
223 | * *correctly*. We transform the request to a read backward | |
224 | * and try again. | |
225 | */ | |
226 | tape_std_read_backward(device, request); | |
227 | return tape_34xx_erp_retry(request); | |
228 | } | |
229 | if (request->op != TO_RBA) | |
230 | PRINT_ERR("read_opposite called with state:%s\n", | |
231 | tape_op_verbose[request->op]); | |
232 | /* | |
233 | * We tried to read forward and backward, but hat no | |
234 | * success -> failed. | |
235 | */ | |
236 | return tape_34xx_erp_failed(request, -EIO); | |
237 | } | |
238 | ||
239 | static int | |
240 | tape_34xx_erp_bug(struct tape_device *device, struct tape_request *request, | |
241 | struct irb *irb, int no) | |
242 | { | |
243 | if (request->op != TO_ASSIGN) { | |
244 | PRINT_WARN("An unexpected condition #%d was caught in " | |
245 | "tape error recovery.\n", no); | |
246 | PRINT_WARN("Please report this incident.\n"); | |
247 | if (request) | |
248 | PRINT_WARN("Operation of tape:%s\n", | |
249 | tape_op_verbose[request->op]); | |
250 | tape_dump_sense(device, request, irb); | |
251 | } | |
252 | return tape_34xx_erp_failed(request, -EIO); | |
253 | } | |
254 | ||
255 | /* | |
256 | * Handle data overrun between cu and drive. The channel speed might | |
257 | * be too slow. | |
258 | */ | |
259 | static int | |
260 | tape_34xx_erp_overrun(struct tape_device *device, struct tape_request *request, | |
261 | struct irb *irb) | |
262 | { | |
263 | if (irb->ecw[3] == 0x40) { | |
264 | PRINT_WARN ("Data overrun error between control-unit " | |
265 | "and drive. Use a faster channel connection, " | |
266 | "if possible! \n"); | |
267 | return tape_34xx_erp_failed(request, -EIO); | |
268 | } | |
269 | return tape_34xx_erp_bug(device, request, irb, -1); | |
270 | } | |
271 | ||
272 | /* | |
273 | * Handle record sequence error. | |
274 | */ | |
275 | static int | |
276 | tape_34xx_erp_sequence(struct tape_device *device, | |
277 | struct tape_request *request, struct irb *irb) | |
278 | { | |
279 | if (irb->ecw[3] == 0x41) { | |
280 | /* | |
281 | * cu detected incorrect block-id sequence on tape. | |
282 | */ | |
283 | PRINT_WARN("Illegal block-id sequence found!\n"); | |
284 | return tape_34xx_erp_failed(request, -EIO); | |
285 | } | |
286 | /* | |
287 | * Record sequence error bit is set, but erpa does not | |
288 | * show record sequence error. | |
289 | */ | |
290 | return tape_34xx_erp_bug(device, request, irb, -2); | |
291 | } | |
292 | ||
293 | /* | |
294 | * This function analyses the tape's sense-data in case of a unit-check. | |
295 | * If possible, it tries to recover from the error. Else the user is | |
296 | * informed about the problem. | |
297 | */ | |
298 | static int | |
299 | tape_34xx_unit_check(struct tape_device *device, struct tape_request *request, | |
300 | struct irb *irb) | |
301 | { | |
302 | int inhibit_cu_recovery; | |
303 | __u8* sense; | |
304 | ||
305 | inhibit_cu_recovery = (*device->modeset_byte & 0x80) ? 1 : 0; | |
306 | sense = irb->ecw; | |
307 | ||
308 | #ifdef CONFIG_S390_TAPE_BLOCK | |
309 | if (request->op == TO_BLOCK) { | |
310 | /* | |
311 | * Recovery for block device requests. Set the block_position | |
312 | * to something invalid and retry. | |
313 | */ | |
314 | device->blk_data.block_position = -1; | |
315 | if (request->retries-- <= 0) | |
316 | return tape_34xx_erp_failed(request, -EIO); | |
317 | else | |
318 | return tape_34xx_erp_retry(request); | |
319 | } | |
320 | #endif | |
321 | ||
322 | if ( | |
323 | sense[0] & SENSE_COMMAND_REJECT && | |
324 | sense[1] & SENSE_WRITE_PROTECT | |
325 | ) { | |
326 | if ( | |
327 | request->op == TO_DSE || | |
328 | request->op == TO_WRI || | |
329 | request->op == TO_WTM | |
330 | ) { | |
331 | /* medium is write protected */ | |
332 | return tape_34xx_erp_failed(request, -EACCES); | |
333 | } else { | |
334 | return tape_34xx_erp_bug(device, request, irb, -3); | |
335 | } | |
336 | } | |
337 | ||
338 | /* | |
339 | * Special cases for various tape-states when reaching | |
340 | * end of recorded area | |
341 | * | |
342 | * FIXME: Maybe a special case of the special case: | |
343 | * sense[0] == SENSE_EQUIPMENT_CHECK && | |
344 | * sense[1] == SENSE_DRIVE_ONLINE && | |
345 | * sense[3] == 0x47 (Volume Fenced) | |
346 | * | |
347 | * This was caused by continued FSF or FSR after an | |
348 | * 'End Of Data'. | |
349 | */ | |
350 | if (( | |
351 | sense[0] == SENSE_DATA_CHECK || | |
352 | sense[0] == SENSE_EQUIPMENT_CHECK || | |
353 | sense[0] == SENSE_EQUIPMENT_CHECK + SENSE_DEFERRED_UNIT_CHECK | |
354 | ) && ( | |
355 | sense[1] == SENSE_DRIVE_ONLINE || | |
356 | sense[1] == SENSE_BEGINNING_OF_TAPE + SENSE_WRITE_MODE | |
357 | )) { | |
358 | switch (request->op) { | |
359 | /* | |
360 | * sense[0] == SENSE_DATA_CHECK && | |
361 | * sense[1] == SENSE_DRIVE_ONLINE | |
362 | * sense[3] == 0x36 (End Of Data) | |
363 | * | |
364 | * Further seeks might return a 'Volume Fenced'. | |
365 | */ | |
366 | case TO_FSF: | |
367 | case TO_FSB: | |
368 | /* Trying to seek beyond end of recorded area */ | |
369 | return tape_34xx_erp_failed(request, -ENOSPC); | |
370 | case TO_BSB: | |
371 | return tape_34xx_erp_retry(request); | |
372 | ||
373 | /* | |
374 | * sense[0] == SENSE_DATA_CHECK && | |
375 | * sense[1] == SENSE_DRIVE_ONLINE && | |
376 | * sense[3] == 0x36 (End Of Data) | |
377 | */ | |
378 | case TO_LBL: | |
379 | /* Block could not be located. */ | |
380 | tape_34xx_delete_sbid_from(device, 0); | |
381 | return tape_34xx_erp_failed(request, -EIO); | |
382 | ||
383 | case TO_RFO: | |
384 | /* Read beyond end of recorded area -> 0 bytes read */ | |
385 | return tape_34xx_erp_failed(request, 0); | |
386 | ||
387 | /* | |
388 | * sense[0] == SENSE_EQUIPMENT_CHECK && | |
389 | * sense[1] == SENSE_DRIVE_ONLINE && | |
390 | * sense[3] == 0x38 (Physical End Of Volume) | |
391 | */ | |
392 | case TO_WRI: | |
393 | /* Writing at physical end of volume */ | |
394 | return tape_34xx_erp_failed(request, -ENOSPC); | |
395 | default: | |
396 | PRINT_ERR("Invalid op in %s:%i\n", | |
2a2cf6b1 | 397 | __func__, __LINE__); |
1da177e4 LT |
398 | return tape_34xx_erp_failed(request, 0); |
399 | } | |
400 | } | |
401 | ||
402 | /* Sensing special bits */ | |
403 | if (sense[0] & SENSE_BUS_OUT_CHECK) | |
404 | return tape_34xx_erp_retry(request); | |
405 | ||
406 | if (sense[0] & SENSE_DATA_CHECK) { | |
407 | /* | |
408 | * hardware failure, damaged tape or improper | |
409 | * operating conditions | |
410 | */ | |
411 | switch (sense[3]) { | |
412 | case 0x23: | |
413 | /* a read data check occurred */ | |
414 | if ((sense[2] & SENSE_TAPE_SYNC_MODE) || | |
415 | inhibit_cu_recovery) | |
416 | // data check is not permanent, may be | |
417 | // recovered. We always use async-mode with | |
418 | // cu-recovery, so this should *never* happen. | |
419 | return tape_34xx_erp_bug(device, request, | |
420 | irb, -4); | |
421 | ||
422 | /* data check is permanent, CU recovery has failed */ | |
423 | PRINT_WARN("Permanent read error\n"); | |
424 | return tape_34xx_erp_failed(request, -EIO); | |
425 | case 0x25: | |
426 | // a write data check occurred | |
427 | if ((sense[2] & SENSE_TAPE_SYNC_MODE) || | |
428 | inhibit_cu_recovery) | |
429 | // data check is not permanent, may be | |
430 | // recovered. We always use async-mode with | |
431 | // cu-recovery, so this should *never* happen. | |
432 | return tape_34xx_erp_bug(device, request, | |
433 | irb, -5); | |
434 | ||
435 | // data check is permanent, cu-recovery has failed | |
436 | PRINT_WARN("Permanent write error\n"); | |
437 | return tape_34xx_erp_failed(request, -EIO); | |
438 | case 0x26: | |
439 | /* Data Check (read opposite) occurred. */ | |
440 | return tape_34xx_erp_read_opposite(device, request); | |
441 | case 0x28: | |
442 | /* ID-Mark at tape start couldn't be written */ | |
443 | PRINT_WARN("ID-Mark could not be written.\n"); | |
444 | return tape_34xx_erp_failed(request, -EIO); | |
445 | case 0x31: | |
446 | /* Tape void. Tried to read beyond end of device. */ | |
447 | PRINT_WARN("Read beyond end of recorded area.\n"); | |
448 | return tape_34xx_erp_failed(request, -ENOSPC); | |
449 | case 0x41: | |
450 | /* Record sequence error. */ | |
451 | PRINT_WARN("Invalid block-id sequence found.\n"); | |
452 | return tape_34xx_erp_failed(request, -EIO); | |
453 | default: | |
454 | /* all data checks for 3480 should result in one of | |
455 | * the above erpa-codes. For 3490, other data-check | |
456 | * conditions do exist. */ | |
457 | if (device->cdev->id.driver_info == tape_3480) | |
458 | return tape_34xx_erp_bug(device, request, | |
459 | irb, -6); | |
460 | } | |
461 | } | |
462 | ||
463 | if (sense[0] & SENSE_OVERRUN) | |
464 | return tape_34xx_erp_overrun(device, request, irb); | |
465 | ||
466 | if (sense[1] & SENSE_RECORD_SEQUENCE_ERR) | |
467 | return tape_34xx_erp_sequence(device, request, irb); | |
468 | ||
469 | /* Sensing erpa codes */ | |
470 | switch (sense[3]) { | |
471 | case 0x00: | |
472 | /* Unit check with erpa code 0. Report and ignore. */ | |
473 | PRINT_WARN("Non-error sense was found. " | |
474 | "Unit-check will be ignored.\n"); | |
475 | return TAPE_IO_SUCCESS; | |
476 | case 0x21: | |
477 | /* | |
478 | * Data streaming not operational. CU will switch to | |
479 | * interlock mode. Reissue the command. | |
480 | */ | |
481 | PRINT_WARN("Data streaming not operational. " | |
482 | "Switching to interlock-mode.\n"); | |
483 | return tape_34xx_erp_retry(request); | |
484 | case 0x22: | |
485 | /* | |
486 | * Path equipment check. Might be drive adapter error, buffer | |
487 | * error on the lower interface, internal path not usable, | |
488 | * or error during cartridge load. | |
489 | */ | |
490 | PRINT_WARN("A path equipment check occurred. One of the " | |
491 | "following conditions occurred:\n"); | |
492 | PRINT_WARN("drive adapter error, buffer error on the lower " | |
493 | "interface, internal path not usable, error " | |
494 | "during cartridge load.\n"); | |
495 | return tape_34xx_erp_failed(request, -EIO); | |
496 | case 0x24: | |
497 | /* | |
498 | * Load display check. Load display was command was issued, | |
499 | * but the drive is displaying a drive check message. Can | |
500 | * be threated as "device end". | |
501 | */ | |
502 | return tape_34xx_erp_succeeded(request); | |
503 | case 0x27: | |
504 | /* | |
505 | * Command reject. May indicate illegal channel program or | |
506 | * buffer over/underrun. Since all channel programs are | |
507 | * issued by this driver and ought be correct, we assume a | |
508 | * over/underrun situation and retry the channel program. | |
509 | */ | |
510 | return tape_34xx_erp_retry(request); | |
511 | case 0x29: | |
512 | /* | |
513 | * Function incompatible. Either the tape is idrc compressed | |
514 | * but the hardware isn't capable to do idrc, or a perform | |
515 | * subsystem func is issued and the CU is not on-line. | |
516 | */ | |
517 | PRINT_WARN ("Function incompatible. Try to switch off idrc\n"); | |
518 | return tape_34xx_erp_failed(request, -EIO); | |
519 | case 0x2a: | |
520 | /* | |
521 | * Unsolicited environmental data. An internal counter | |
522 | * overflows, we can ignore this and reissue the cmd. | |
523 | */ | |
524 | return tape_34xx_erp_retry(request); | |
525 | case 0x2b: | |
526 | /* | |
527 | * Environmental data present. Indicates either unload | |
528 | * completed ok or read buffered log command completed ok. | |
529 | */ | |
530 | if (request->op == TO_RUN) { | |
531 | /* Rewind unload completed ok. */ | |
532 | tape_med_state_set(device, MS_UNLOADED); | |
533 | return tape_34xx_erp_succeeded(request); | |
534 | } | |
535 | /* tape_34xx doesn't use read buffered log commands. */ | |
536 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
537 | case 0x2c: | |
538 | /* | |
539 | * Permanent equipment check. CU has tried recovery, but | |
540 | * did not succeed. | |
541 | */ | |
542 | return tape_34xx_erp_failed(request, -EIO); | |
543 | case 0x2d: | |
544 | /* Data security erase failure. */ | |
545 | if (request->op == TO_DSE) | |
546 | return tape_34xx_erp_failed(request, -EIO); | |
547 | /* Data security erase failure, but no such command issued. */ | |
548 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
549 | case 0x2e: | |
550 | /* | |
551 | * Not capable. This indicates either that the drive fails | |
552 | * reading the format id mark or that that format specified | |
553 | * is not supported by the drive. | |
554 | */ | |
555 | PRINT_WARN("Drive not capable processing the tape format!\n"); | |
556 | return tape_34xx_erp_failed(request, -EMEDIUMTYPE); | |
557 | case 0x30: | |
558 | /* The medium is write protected. */ | |
559 | PRINT_WARN("Medium is write protected!\n"); | |
560 | return tape_34xx_erp_failed(request, -EACCES); | |
561 | case 0x32: | |
562 | // Tension loss. We cannot recover this, it's an I/O error. | |
563 | PRINT_WARN("The drive lost tape tension.\n"); | |
564 | return tape_34xx_erp_failed(request, -EIO); | |
565 | case 0x33: | |
566 | /* | |
567 | * Load Failure. The cartridge was not inserted correctly or | |
568 | * the tape is not threaded correctly. | |
569 | */ | |
570 | PRINT_WARN("Cartridge load failure. Reload the cartridge " | |
571 | "and try again.\n"); | |
572 | tape_34xx_delete_sbid_from(device, 0); | |
573 | return tape_34xx_erp_failed(request, -EIO); | |
574 | case 0x34: | |
575 | /* | |
576 | * Unload failure. The drive cannot maintain tape tension | |
577 | * and control tape movement during an unload operation. | |
578 | */ | |
579 | PRINT_WARN("Failure during cartridge unload. " | |
580 | "Please try manually.\n"); | |
581 | if (request->op == TO_RUN) | |
582 | return tape_34xx_erp_failed(request, -EIO); | |
583 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
584 | case 0x35: | |
585 | /* | |
586 | * Drive equipment check. One of the following: | |
587 | * - cu cannot recover from a drive detected error | |
588 | * - a check code message is shown on drive display | |
589 | * - the cartridge loader does not respond correctly | |
590 | * - a failure occurs during an index, load, or unload cycle | |
591 | */ | |
592 | PRINT_WARN("Equipment check! Please check the drive and " | |
593 | "the cartridge loader.\n"); | |
594 | return tape_34xx_erp_failed(request, -EIO); | |
595 | case 0x36: | |
596 | if (device->cdev->id.driver_info == tape_3490) | |
597 | /* End of data. */ | |
598 | return tape_34xx_erp_failed(request, -EIO); | |
599 | /* This erpa is reserved for 3480 */ | |
600 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
601 | case 0x37: | |
602 | /* | |
603 | * Tape length error. The tape is shorter than reported in | |
604 | * the beginning-of-tape data. | |
605 | */ | |
606 | PRINT_WARN("Tape length error.\n"); | |
607 | return tape_34xx_erp_failed(request, -EIO); | |
608 | case 0x38: | |
609 | /* | |
610 | * Physical end of tape. A read/write operation reached | |
611 | * the physical end of tape. | |
612 | */ | |
613 | if (request->op==TO_WRI || | |
614 | request->op==TO_DSE || | |
615 | request->op==TO_WTM) | |
616 | return tape_34xx_erp_failed(request, -ENOSPC); | |
617 | return tape_34xx_erp_failed(request, -EIO); | |
618 | case 0x39: | |
619 | /* Backward at Beginning of tape. */ | |
620 | return tape_34xx_erp_failed(request, -EIO); | |
621 | case 0x3a: | |
622 | /* Drive switched to not ready. */ | |
623 | PRINT_WARN("Drive not ready. Turn the ready/not ready switch " | |
624 | "to ready position and try again.\n"); | |
625 | return tape_34xx_erp_failed(request, -EIO); | |
626 | case 0x3b: | |
627 | /* Manual rewind or unload. This causes an I/O error. */ | |
628 | PRINT_WARN("Medium was rewound or unloaded manually.\n"); | |
629 | tape_34xx_delete_sbid_from(device, 0); | |
630 | return tape_34xx_erp_failed(request, -EIO); | |
631 | case 0x42: | |
632 | /* | |
633 | * Degraded mode. A condition that can cause degraded | |
634 | * performance is detected. | |
635 | */ | |
636 | PRINT_WARN("Subsystem is running in degraded mode.\n"); | |
637 | return tape_34xx_erp_retry(request); | |
638 | case 0x43: | |
639 | /* Drive not ready. */ | |
640 | tape_34xx_delete_sbid_from(device, 0); | |
641 | tape_med_state_set(device, MS_UNLOADED); | |
642 | /* Some commands commands are successful even in this case */ | |
643 | if (sense[1] & SENSE_DRIVE_ONLINE) { | |
644 | switch(request->op) { | |
645 | case TO_ASSIGN: | |
646 | case TO_UNASSIGN: | |
647 | case TO_DIS: | |
648 | case TO_NOP: | |
649 | return tape_34xx_done(request); | |
650 | break; | |
651 | default: | |
652 | break; | |
653 | } | |
654 | } | |
655 | PRINT_WARN("The drive is not ready.\n"); | |
656 | return tape_34xx_erp_failed(request, -ENOMEDIUM); | |
657 | case 0x44: | |
658 | /* Locate Block unsuccessful. */ | |
659 | if (request->op != TO_BLOCK && request->op != TO_LBL) | |
660 | /* No locate block was issued. */ | |
661 | return tape_34xx_erp_bug(device, request, | |
662 | irb, sense[3]); | |
663 | return tape_34xx_erp_failed(request, -EIO); | |
664 | case 0x45: | |
665 | /* The drive is assigned to a different channel path. */ | |
666 | PRINT_WARN("The drive is assigned elsewhere.\n"); | |
667 | return tape_34xx_erp_failed(request, -EIO); | |
668 | case 0x46: | |
669 | /* | |
670 | * Drive not on-line. Drive may be switched offline, | |
671 | * the power supply may be switched off or | |
672 | * the drive address may not be set correctly. | |
673 | */ | |
674 | PRINT_WARN("The drive is not on-line."); | |
675 | return tape_34xx_erp_failed(request, -EIO); | |
676 | case 0x47: | |
677 | /* Volume fenced. CU reports volume integrity is lost. */ | |
678 | PRINT_WARN("Volume fenced. The volume integrity is lost.\n"); | |
679 | tape_34xx_delete_sbid_from(device, 0); | |
680 | return tape_34xx_erp_failed(request, -EIO); | |
681 | case 0x48: | |
682 | /* Log sense data and retry request. */ | |
683 | return tape_34xx_erp_retry(request); | |
684 | case 0x49: | |
685 | /* Bus out check. A parity check error on the bus was found. */ | |
686 | PRINT_WARN("Bus out check. A data transfer over the bus " | |
687 | "has been corrupted.\n"); | |
688 | return tape_34xx_erp_failed(request, -EIO); | |
689 | case 0x4a: | |
690 | /* Control unit erp failed. */ | |
691 | PRINT_WARN("The control unit I/O error recovery failed.\n"); | |
692 | return tape_34xx_erp_failed(request, -EIO); | |
693 | case 0x4b: | |
694 | /* | |
695 | * CU and drive incompatible. The drive requests micro-program | |
696 | * patches, which are not available on the CU. | |
697 | */ | |
698 | PRINT_WARN("The drive needs microprogram patches from the " | |
699 | "control unit, which are not available.\n"); | |
700 | return tape_34xx_erp_failed(request, -EIO); | |
701 | case 0x4c: | |
702 | /* | |
703 | * Recovered Check-One failure. Cu develops a hardware error, | |
704 | * but is able to recover. | |
705 | */ | |
706 | return tape_34xx_erp_retry(request); | |
707 | case 0x4d: | |
708 | if (device->cdev->id.driver_info == tape_3490) | |
709 | /* | |
710 | * Resetting event received. Since the driver does | |
711 | * not support resetting event recovery (which has to | |
712 | * be handled by the I/O Layer), retry our command. | |
713 | */ | |
714 | return tape_34xx_erp_retry(request); | |
715 | /* This erpa is reserved for 3480. */ | |
716 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
717 | case 0x4e: | |
718 | if (device->cdev->id.driver_info == tape_3490) { | |
719 | /* | |
720 | * Maximum block size exceeded. This indicates, that | |
721 | * the block to be written is larger than allowed for | |
722 | * buffered mode. | |
723 | */ | |
724 | PRINT_WARN("Maximum block size for buffered " | |
725 | "mode exceeded.\n"); | |
726 | return tape_34xx_erp_failed(request, -ENOBUFS); | |
727 | } | |
728 | /* This erpa is reserved for 3480. */ | |
729 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
730 | case 0x50: | |
731 | /* | |
732 | * Read buffered log (Overflow). CU is running in extended | |
733 | * buffered log mode, and a counter overflows. This should | |
734 | * never happen, since we're never running in extended | |
735 | * buffered log mode. | |
736 | */ | |
737 | return tape_34xx_erp_retry(request); | |
738 | case 0x51: | |
739 | /* | |
740 | * Read buffered log (EOV). EOF processing occurs while the | |
741 | * CU is in extended buffered log mode. This should never | |
742 | * happen, since we're never running in extended buffered | |
743 | * log mode. | |
744 | */ | |
745 | return tape_34xx_erp_retry(request); | |
746 | case 0x52: | |
747 | /* End of Volume complete. Rewind unload completed ok. */ | |
748 | if (request->op == TO_RUN) { | |
749 | tape_med_state_set(device, MS_UNLOADED); | |
750 | tape_34xx_delete_sbid_from(device, 0); | |
751 | return tape_34xx_erp_succeeded(request); | |
752 | } | |
753 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
754 | case 0x53: | |
755 | /* Global command intercept. */ | |
756 | return tape_34xx_erp_retry(request); | |
757 | case 0x54: | |
758 | /* Channel interface recovery (temporary). */ | |
759 | return tape_34xx_erp_retry(request); | |
760 | case 0x55: | |
761 | /* Channel interface recovery (permanent). */ | |
762 | PRINT_WARN("A permanent channel interface error occurred.\n"); | |
763 | return tape_34xx_erp_failed(request, -EIO); | |
764 | case 0x56: | |
765 | /* Channel protocol error. */ | |
766 | PRINT_WARN("A channel protocol error occurred.\n"); | |
767 | return tape_34xx_erp_failed(request, -EIO); | |
768 | case 0x57: | |
769 | if (device->cdev->id.driver_info == tape_3480) { | |
770 | /* Attention intercept. */ | |
771 | PRINT_WARN("An attention intercept occurred, " | |
772 | "which will be recovered.\n"); | |
773 | return tape_34xx_erp_retry(request); | |
774 | } else { | |
775 | /* Global status intercept. */ | |
776 | PRINT_WARN("An global status intercept was received, " | |
777 | "which will be recovered.\n"); | |
778 | return tape_34xx_erp_retry(request); | |
779 | } | |
780 | case 0x5a: | |
781 | /* | |
782 | * Tape length incompatible. The tape inserted is too long, | |
783 | * which could cause damage to the tape or the drive. | |
784 | */ | |
785 | PRINT_WARN("Tape Length Incompatible\n"); | |
786 | PRINT_WARN("Tape length exceeds IBM enhanced capacity " | |
787 | "cartdridge length or a medium\n"); | |
788 | PRINT_WARN("with EC-CST identification mark has been mounted " | |
789 | "in a device that writes\n"); | |
790 | PRINT_WARN("3480 or 3480 XF format.\n"); | |
791 | return tape_34xx_erp_failed(request, -EIO); | |
792 | case 0x5b: | |
793 | /* Format 3480 XF incompatible */ | |
794 | if (sense[1] & SENSE_BEGINNING_OF_TAPE) | |
795 | /* The tape will get overwritten. */ | |
796 | return tape_34xx_erp_retry(request); | |
797 | PRINT_WARN("Format 3480 XF Incompatible\n"); | |
798 | PRINT_WARN("Medium has been created in 3480 format. " | |
799 | "To change the format writes\n"); | |
800 | PRINT_WARN("must be issued at BOT.\n"); | |
801 | return tape_34xx_erp_failed(request, -EIO); | |
802 | case 0x5c: | |
803 | /* Format 3480-2 XF incompatible */ | |
804 | PRINT_WARN("Format 3480-2 XF Incompatible\n"); | |
805 | PRINT_WARN("Device can only read 3480 or 3480 XF format.\n"); | |
806 | return tape_34xx_erp_failed(request, -EIO); | |
807 | case 0x5d: | |
808 | /* Tape length violation. */ | |
809 | PRINT_WARN("Tape Length Violation\n"); | |
810 | PRINT_WARN("The mounted tape exceeds IBM Enhanced Capacity " | |
811 | "Cartdridge System Tape length.\n"); | |
812 | PRINT_WARN("This may cause damage to the drive or tape when " | |
813 | "processing to the EOV\n"); | |
814 | return tape_34xx_erp_failed(request, -EMEDIUMTYPE); | |
815 | case 0x5e: | |
816 | /* Compaction algorithm incompatible. */ | |
817 | PRINT_WARN("Compaction Algorithm Incompatible\n"); | |
818 | PRINT_WARN("The volume is recorded using an incompatible " | |
819 | "compaction algorithm,\n"); | |
820 | PRINT_WARN("which is not supported by the device.\n"); | |
821 | return tape_34xx_erp_failed(request, -EMEDIUMTYPE); | |
822 | ||
823 | /* The following erpas should have been covered earlier. */ | |
824 | case 0x23: /* Read data check. */ | |
825 | case 0x25: /* Write data check. */ | |
826 | case 0x26: /* Data check (read opposite). */ | |
827 | case 0x28: /* Write id mark check. */ | |
828 | case 0x31: /* Tape void. */ | |
829 | case 0x40: /* Overrun error. */ | |
830 | case 0x41: /* Record sequence error. */ | |
831 | /* All other erpas are reserved for future use. */ | |
832 | default: | |
833 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
834 | } | |
835 | } | |
836 | ||
837 | /* | |
838 | * 3480/3490 interrupt handler | |
839 | */ | |
840 | static int | |
841 | tape_34xx_irq(struct tape_device *device, struct tape_request *request, | |
842 | struct irb *irb) | |
843 | { | |
844 | if (request == NULL) | |
845 | return tape_34xx_unsolicited_irq(device, irb); | |
846 | ||
23d805b6 PO |
847 | if ((irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) && |
848 | (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) && | |
1da177e4 LT |
849 | (request->op == TO_WRI)) { |
850 | /* Write at end of volume */ | |
851 | PRINT_INFO("End of volume\n"); /* XXX */ | |
852 | return tape_34xx_erp_failed(request, -ENOSPC); | |
853 | } | |
854 | ||
23d805b6 | 855 | if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) |
1da177e4 LT |
856 | return tape_34xx_unit_check(device, request, irb); |
857 | ||
23d805b6 | 858 | if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) { |
1da177e4 LT |
859 | /* |
860 | * A unit exception occurs on skipping over a tapemark block. | |
861 | */ | |
23d805b6 | 862 | if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) { |
1da177e4 LT |
863 | if (request->op == TO_BSB || request->op == TO_FSB) |
864 | request->rescnt++; | |
865 | else | |
866 | DBF_EVENT(5, "Unit Exception!\n"); | |
867 | } | |
868 | return tape_34xx_done(request); | |
869 | } | |
870 | ||
871 | DBF_EVENT(6, "xunknownirq\n"); | |
872 | PRINT_ERR("Unexpected interrupt.\n"); | |
873 | PRINT_ERR("Current op is: %s", tape_op_verbose[request->op]); | |
874 | tape_dump_sense(device, request, irb); | |
875 | return TAPE_IO_STOP; | |
876 | } | |
877 | ||
878 | /* | |
879 | * ioctl_overload | |
880 | */ | |
881 | static int | |
882 | tape_34xx_ioctl(struct tape_device *device, unsigned int cmd, unsigned long arg) | |
883 | { | |
884 | if (cmd == TAPE390_DISPLAY) { | |
885 | struct display_struct disp; | |
886 | ||
887 | if (copy_from_user(&disp, (char __user *) arg, sizeof(disp)) != 0) | |
888 | return -EFAULT; | |
889 | ||
890 | return tape_std_display(device, &disp); | |
891 | } else | |
892 | return -EINVAL; | |
893 | } | |
894 | ||
895 | static inline void | |
896 | tape_34xx_append_new_sbid(struct tape_34xx_block_id bid, struct list_head *l) | |
897 | { | |
898 | struct tape_34xx_sbid * new_sbid; | |
899 | ||
900 | new_sbid = kmalloc(sizeof(*new_sbid), GFP_ATOMIC); | |
901 | if (!new_sbid) | |
902 | return; | |
903 | ||
904 | new_sbid->bid = bid; | |
905 | list_add(&new_sbid->list, l); | |
906 | } | |
907 | ||
908 | /* | |
909 | * Build up the search block ID list. The block ID consists of a logical | |
910 | * block number and a hardware specific part. The hardware specific part | |
911 | * helps the tape drive to speed up searching for a specific block. | |
912 | */ | |
913 | static void | |
914 | tape_34xx_add_sbid(struct tape_device *device, struct tape_34xx_block_id bid) | |
915 | { | |
916 | struct list_head * sbid_list; | |
917 | struct tape_34xx_sbid * sbid; | |
918 | struct list_head * l; | |
919 | ||
920 | /* | |
921 | * immediately return if there is no list at all or the block to add | |
922 | * is located in segment 1 of wrap 0 because this position is used | |
923 | * if no hardware position data is supplied. | |
924 | */ | |
925 | sbid_list = (struct list_head *) device->discdata; | |
926 | if (!sbid_list || (bid.segment < 2 && bid.wrap == 0)) | |
927 | return; | |
928 | ||
929 | /* | |
930 | * Search the position where to insert the new entry. Hardware | |
931 | * acceleration uses only the segment and wrap number. So we | |
932 | * need only one entry for a specific wrap/segment combination. | |
933 | * If there is a block with a lower number but the same hard- | |
934 | * ware position data we just update the block number in the | |
935 | * existing entry. | |
936 | */ | |
937 | list_for_each(l, sbid_list) { | |
938 | sbid = list_entry(l, struct tape_34xx_sbid, list); | |
939 | ||
940 | if ( | |
941 | (sbid->bid.segment == bid.segment) && | |
942 | (sbid->bid.wrap == bid.wrap) | |
943 | ) { | |
944 | if (bid.block < sbid->bid.block) | |
945 | sbid->bid = bid; | |
946 | else return; | |
947 | break; | |
948 | } | |
949 | ||
950 | /* Sort in according to logical block number. */ | |
951 | if (bid.block < sbid->bid.block) { | |
952 | tape_34xx_append_new_sbid(bid, l->prev); | |
953 | break; | |
954 | } | |
955 | } | |
956 | /* List empty or new block bigger than last entry. */ | |
957 | if (l == sbid_list) | |
958 | tape_34xx_append_new_sbid(bid, l->prev); | |
959 | ||
960 | DBF_LH(4, "Current list is:\n"); | |
961 | list_for_each(l, sbid_list) { | |
962 | sbid = list_entry(l, struct tape_34xx_sbid, list); | |
963 | DBF_LH(4, "%d:%03d@%05d\n", | |
964 | sbid->bid.wrap, | |
965 | sbid->bid.segment, | |
966 | sbid->bid.block | |
967 | ); | |
968 | } | |
969 | } | |
970 | ||
971 | /* | |
972 | * Delete all entries from the search block ID list that belong to tape blocks | |
973 | * equal or higher than the given number. | |
974 | */ | |
975 | static void | |
976 | tape_34xx_delete_sbid_from(struct tape_device *device, int from) | |
977 | { | |
978 | struct list_head * sbid_list; | |
979 | struct tape_34xx_sbid * sbid; | |
980 | struct list_head * l; | |
981 | struct list_head * n; | |
982 | ||
983 | sbid_list = (struct list_head *) device->discdata; | |
984 | if (!sbid_list) | |
985 | return; | |
986 | ||
987 | list_for_each_safe(l, n, sbid_list) { | |
988 | sbid = list_entry(l, struct tape_34xx_sbid, list); | |
989 | if (sbid->bid.block >= from) { | |
990 | DBF_LH(4, "Delete sbid %d:%03d@%05d\n", | |
991 | sbid->bid.wrap, | |
992 | sbid->bid.segment, | |
993 | sbid->bid.block | |
994 | ); | |
995 | list_del(l); | |
996 | kfree(sbid); | |
997 | } | |
998 | } | |
999 | } | |
1000 | ||
1001 | /* | |
1002 | * Merge hardware position data into a block id. | |
1003 | */ | |
1004 | static void | |
1005 | tape_34xx_merge_sbid( | |
1006 | struct tape_device * device, | |
1007 | struct tape_34xx_block_id * bid | |
1008 | ) { | |
1009 | struct tape_34xx_sbid * sbid; | |
1010 | struct tape_34xx_sbid * sbid_to_use; | |
1011 | struct list_head * sbid_list; | |
1012 | struct list_head * l; | |
1013 | ||
1014 | sbid_list = (struct list_head *) device->discdata; | |
1015 | bid->wrap = 0; | |
1016 | bid->segment = 1; | |
1017 | ||
1018 | if (!sbid_list || list_empty(sbid_list)) | |
1019 | return; | |
1020 | ||
1021 | sbid_to_use = NULL; | |
1022 | list_for_each(l, sbid_list) { | |
1023 | sbid = list_entry(l, struct tape_34xx_sbid, list); | |
1024 | ||
1025 | if (sbid->bid.block >= bid->block) | |
1026 | break; | |
1027 | sbid_to_use = sbid; | |
1028 | } | |
1029 | if (sbid_to_use) { | |
1030 | bid->wrap = sbid_to_use->bid.wrap; | |
1031 | bid->segment = sbid_to_use->bid.segment; | |
1032 | DBF_LH(4, "Use %d:%03d@%05d for %05d\n", | |
1033 | sbid_to_use->bid.wrap, | |
1034 | sbid_to_use->bid.segment, | |
1035 | sbid_to_use->bid.block, | |
1036 | bid->block | |
1037 | ); | |
1038 | } | |
1039 | } | |
1040 | ||
1041 | static int | |
1042 | tape_34xx_setup_device(struct tape_device * device) | |
1043 | { | |
1044 | int rc; | |
1045 | struct list_head * discdata; | |
1046 | ||
1047 | DBF_EVENT(6, "34xx device setup\n"); | |
1048 | if ((rc = tape_std_assign(device)) == 0) { | |
1049 | if ((rc = tape_34xx_medium_sense(device)) != 0) { | |
1050 | DBF_LH(3, "34xx medium sense returned %d\n", rc); | |
1051 | } | |
1052 | } | |
1053 | discdata = kmalloc(sizeof(struct list_head), GFP_KERNEL); | |
1054 | if (discdata) { | |
1055 | INIT_LIST_HEAD(discdata); | |
1056 | device->discdata = discdata; | |
1057 | } | |
1058 | ||
1059 | return rc; | |
1060 | } | |
1061 | ||
1062 | static void | |
1063 | tape_34xx_cleanup_device(struct tape_device *device) | |
1064 | { | |
1065 | tape_std_unassign(device); | |
1066 | ||
1067 | if (device->discdata) { | |
1068 | tape_34xx_delete_sbid_from(device, 0); | |
1069 | kfree(device->discdata); | |
1070 | device->discdata = NULL; | |
1071 | } | |
1072 | } | |
1073 | ||
1074 | ||
1075 | /* | |
1076 | * MTTELL: Tell block. Return the number of block relative to current file. | |
1077 | */ | |
1078 | static int | |
1079 | tape_34xx_mttell(struct tape_device *device, int mt_count) | |
1080 | { | |
1081 | struct { | |
1082 | struct tape_34xx_block_id cbid; | |
1083 | struct tape_34xx_block_id dbid; | |
1084 | } __attribute__ ((packed)) block_id; | |
1085 | int rc; | |
1086 | ||
1087 | rc = tape_std_read_block_id(device, (__u64 *) &block_id); | |
1088 | if (rc) | |
1089 | return rc; | |
1090 | ||
1091 | tape_34xx_add_sbid(device, block_id.cbid); | |
1092 | return block_id.cbid.block; | |
1093 | } | |
1094 | ||
1095 | /* | |
1096 | * MTSEEK: seek to the specified block. | |
1097 | */ | |
1098 | static int | |
1099 | tape_34xx_mtseek(struct tape_device *device, int mt_count) | |
1100 | { | |
1101 | struct tape_request *request; | |
1102 | struct tape_34xx_block_id * bid; | |
1103 | ||
1104 | if (mt_count > 0x3fffff) { | |
1105 | DBF_EXCEPTION(6, "xsee parm\n"); | |
1106 | return -EINVAL; | |
1107 | } | |
1108 | request = tape_alloc_request(3, 4); | |
1109 | if (IS_ERR(request)) | |
1110 | return PTR_ERR(request); | |
1111 | ||
1112 | /* setup ccws */ | |
1113 | request->op = TO_LBL; | |
1114 | bid = (struct tape_34xx_block_id *) request->cpdata; | |
1115 | bid->format = (*device->modeset_byte & 0x08) ? | |
1116 | TAPE34XX_FMT_3480_XF : TAPE34XX_FMT_3480; | |
1117 | bid->block = mt_count; | |
1118 | tape_34xx_merge_sbid(device, bid); | |
1119 | ||
1120 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
1121 | tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata); | |
1122 | tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); | |
1123 | ||
1124 | /* execute it */ | |
1125 | return tape_do_io_free(device, request); | |
1126 | } | |
1127 | ||
1128 | #ifdef CONFIG_S390_TAPE_BLOCK | |
1129 | /* | |
1130 | * Tape block read for 34xx. | |
1131 | */ | |
1132 | static struct tape_request * | |
1133 | tape_34xx_bread(struct tape_device *device, struct request *req) | |
1134 | { | |
1135 | struct tape_request *request; | |
1136 | struct ccw1 *ccw; | |
5705f702 | 1137 | int count = 0; |
1da177e4 LT |
1138 | unsigned off; |
1139 | char *dst; | |
1140 | struct bio_vec *bv; | |
5705f702 | 1141 | struct req_iterator iter; |
1da177e4 LT |
1142 | struct tape_34xx_block_id * start_block; |
1143 | ||
1144 | DBF_EVENT(6, "xBREDid:"); | |
1145 | ||
1146 | /* Count the number of blocks for the request. */ | |
5705f702 N |
1147 | rq_for_each_segment(bv, req, iter) |
1148 | count += bv->bv_len >> (TAPEBLOCK_HSEC_S2B + 9); | |
1da177e4 LT |
1149 | |
1150 | /* Allocate the ccw request. */ | |
1151 | request = tape_alloc_request(3+count+1, 8); | |
1152 | if (IS_ERR(request)) | |
1153 | return request; | |
1154 | ||
1155 | /* Setup ccws. */ | |
1156 | request->op = TO_BLOCK; | |
1157 | start_block = (struct tape_34xx_block_id *) request->cpdata; | |
1158 | start_block->block = req->sector >> TAPEBLOCK_HSEC_S2B; | |
1159 | DBF_EVENT(6, "start_block = %i\n", start_block->block); | |
1160 | ||
1161 | ccw = request->cpaddr; | |
1162 | ccw = tape_ccw_cc(ccw, MODE_SET_DB, 1, device->modeset_byte); | |
1163 | ||
1164 | /* | |
1165 | * We always setup a nop after the mode set ccw. This slot is | |
1166 | * used in tape_std_check_locate to insert a locate ccw if the | |
1167 | * current tape position doesn't match the start block to be read. | |
1168 | * The second nop will be filled with a read block id which is in | |
1169 | * turn used by tape_34xx_free_bread to populate the segment bid | |
1170 | * table. | |
1171 | */ | |
1172 | ccw = tape_ccw_cc(ccw, NOP, 0, NULL); | |
1173 | ccw = tape_ccw_cc(ccw, NOP, 0, NULL); | |
1174 | ||
5705f702 | 1175 | rq_for_each_segment(bv, req, iter) { |
6c92e699 JA |
1176 | dst = kmap(bv->bv_page) + bv->bv_offset; |
1177 | for (off = 0; off < bv->bv_len; off += TAPEBLOCK_HSEC_SIZE) { | |
1178 | ccw->flags = CCW_FLAG_CC; | |
1179 | ccw->cmd_code = READ_FORWARD; | |
1180 | ccw->count = TAPEBLOCK_HSEC_SIZE; | |
1181 | set_normalized_cda(ccw, (void*) __pa(dst)); | |
1182 | ccw++; | |
1183 | dst += TAPEBLOCK_HSEC_SIZE; | |
1184 | } | |
1da177e4 LT |
1185 | } |
1186 | ||
1187 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
1188 | DBF_EVENT(6, "xBREDccwg\n"); | |
1189 | return request; | |
1190 | } | |
1191 | ||
1192 | static void | |
1193 | tape_34xx_free_bread (struct tape_request *request) | |
1194 | { | |
1195 | struct ccw1* ccw; | |
1196 | ||
1197 | ccw = request->cpaddr; | |
1198 | if ((ccw + 2)->cmd_code == READ_BLOCK_ID) { | |
1199 | struct { | |
1200 | struct tape_34xx_block_id cbid; | |
1201 | struct tape_34xx_block_id dbid; | |
1202 | } __attribute__ ((packed)) *rbi_data; | |
1203 | ||
1204 | rbi_data = request->cpdata; | |
1205 | ||
1206 | if (request->device) | |
1207 | tape_34xx_add_sbid(request->device, rbi_data->cbid); | |
1208 | } | |
1209 | ||
1210 | /* Last ccw is a nop and doesn't need clear_normalized_cda */ | |
1211 | for (; ccw->flags & CCW_FLAG_CC; ccw++) | |
1212 | if (ccw->cmd_code == READ_FORWARD) | |
1213 | clear_normalized_cda(ccw); | |
1214 | tape_free_request(request); | |
1215 | } | |
1216 | ||
1217 | /* | |
1218 | * check_locate is called just before the tape request is passed to | |
1219 | * the common io layer for execution. It has to check the current | |
1220 | * tape position and insert a locate ccw if it doesn't match the | |
1221 | * start block for the request. | |
1222 | */ | |
1223 | static void | |
1224 | tape_34xx_check_locate(struct tape_device *device, struct tape_request *request) | |
1225 | { | |
1226 | struct tape_34xx_block_id * start_block; | |
1227 | ||
1228 | start_block = (struct tape_34xx_block_id *) request->cpdata; | |
1229 | if (start_block->block == device->blk_data.block_position) | |
1230 | return; | |
1231 | ||
1232 | DBF_LH(4, "Block seek(%06d+%06d)\n", start_block->block, device->bof); | |
1233 | start_block->wrap = 0; | |
1234 | start_block->segment = 1; | |
1235 | start_block->format = (*device->modeset_byte & 0x08) ? | |
1236 | TAPE34XX_FMT_3480_XF : | |
1237 | TAPE34XX_FMT_3480; | |
1238 | start_block->block = start_block->block + device->bof; | |
1239 | tape_34xx_merge_sbid(device, start_block); | |
1240 | tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata); | |
1241 | tape_ccw_cc(request->cpaddr + 2, READ_BLOCK_ID, 8, request->cpdata); | |
1242 | } | |
1243 | #endif | |
1244 | ||
1245 | /* | |
1246 | * List of 3480/3490 magnetic tape commands. | |
1247 | */ | |
1248 | static tape_mtop_fn tape_34xx_mtop[TAPE_NR_MTOPS] = { | |
1249 | [MTRESET] = tape_std_mtreset, | |
1250 | [MTFSF] = tape_std_mtfsf, | |
1251 | [MTBSF] = tape_std_mtbsf, | |
1252 | [MTFSR] = tape_std_mtfsr, | |
1253 | [MTBSR] = tape_std_mtbsr, | |
1254 | [MTWEOF] = tape_std_mtweof, | |
1255 | [MTREW] = tape_std_mtrew, | |
1256 | [MTOFFL] = tape_std_mtoffl, | |
1257 | [MTNOP] = tape_std_mtnop, | |
1258 | [MTRETEN] = tape_std_mtreten, | |
1259 | [MTBSFM] = tape_std_mtbsfm, | |
1260 | [MTFSFM] = tape_std_mtfsfm, | |
1261 | [MTEOM] = tape_std_mteom, | |
1262 | [MTERASE] = tape_std_mterase, | |
1263 | [MTRAS1] = NULL, | |
1264 | [MTRAS2] = NULL, | |
1265 | [MTRAS3] = NULL, | |
1266 | [MTSETBLK] = tape_std_mtsetblk, | |
1267 | [MTSETDENSITY] = NULL, | |
1268 | [MTSEEK] = tape_34xx_mtseek, | |
1269 | [MTTELL] = tape_34xx_mttell, | |
1270 | [MTSETDRVBUFFER] = NULL, | |
1271 | [MTFSS] = NULL, | |
1272 | [MTBSS] = NULL, | |
1273 | [MTWSM] = NULL, | |
1274 | [MTLOCK] = NULL, | |
1275 | [MTUNLOCK] = NULL, | |
1276 | [MTLOAD] = tape_std_mtload, | |
1277 | [MTUNLOAD] = tape_std_mtunload, | |
1278 | [MTCOMPRESSION] = tape_std_mtcompression, | |
1279 | [MTSETPART] = NULL, | |
1280 | [MTMKPART] = NULL | |
1281 | }; | |
1282 | ||
1283 | /* | |
1284 | * Tape discipline structure for 3480 and 3490. | |
1285 | */ | |
1286 | static struct tape_discipline tape_discipline_34xx = { | |
1287 | .owner = THIS_MODULE, | |
1288 | .setup_device = tape_34xx_setup_device, | |
1289 | .cleanup_device = tape_34xx_cleanup_device, | |
1290 | .process_eov = tape_std_process_eov, | |
1291 | .irq = tape_34xx_irq, | |
1292 | .read_block = tape_std_read_block, | |
1293 | .write_block = tape_std_write_block, | |
1294 | #ifdef CONFIG_S390_TAPE_BLOCK | |
1295 | .bread = tape_34xx_bread, | |
1296 | .free_bread = tape_34xx_free_bread, | |
1297 | .check_locate = tape_34xx_check_locate, | |
1298 | #endif | |
1299 | .ioctl_fn = tape_34xx_ioctl, | |
1300 | .mtop_array = tape_34xx_mtop | |
1301 | }; | |
1302 | ||
1303 | static struct ccw_device_id tape_34xx_ids[] = { | |
d2c993d8 HC |
1304 | { CCW_DEVICE_DEVTYPE(0x3480, 0, 0x3480, 0), .driver_info = tape_3480}, |
1305 | { CCW_DEVICE_DEVTYPE(0x3490, 0, 0x3490, 0), .driver_info = tape_3490}, | |
1306 | { /* end of list */ }, | |
1da177e4 LT |
1307 | }; |
1308 | ||
1309 | static int | |
1310 | tape_34xx_online(struct ccw_device *cdev) | |
1311 | { | |
1312 | return tape_generic_online( | |
1313 | cdev->dev.driver_data, | |
1314 | &tape_discipline_34xx | |
1315 | ); | |
1316 | } | |
1317 | ||
1318 | static int | |
1319 | tape_34xx_offline(struct ccw_device *cdev) | |
1320 | { | |
1321 | return tape_generic_offline(cdev->dev.driver_data); | |
1322 | } | |
1323 | ||
1324 | static struct ccw_driver tape_34xx_driver = { | |
1325 | .name = "tape_34xx", | |
1326 | .owner = THIS_MODULE, | |
1327 | .ids = tape_34xx_ids, | |
1328 | .probe = tape_generic_probe, | |
1329 | .remove = tape_generic_remove, | |
1330 | .set_online = tape_34xx_online, | |
1331 | .set_offline = tape_34xx_offline, | |
1332 | }; | |
1333 | ||
1334 | static int | |
1335 | tape_34xx_init (void) | |
1336 | { | |
1337 | int rc; | |
1338 | ||
66a464db | 1339 | TAPE_DBF_AREA = debug_register ( "tape_34xx", 2, 2, 4*sizeof(long)); |
1da177e4 LT |
1340 | debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view); |
1341 | #ifdef DBF_LIKE_HELL | |
1342 | debug_set_level(TAPE_DBF_AREA, 6); | |
1343 | #endif | |
1344 | ||
e018ba1f | 1345 | DBF_EVENT(3, "34xx init\n"); |
1da177e4 LT |
1346 | /* Register driver for 3480/3490 tapes. */ |
1347 | rc = ccw_driver_register(&tape_34xx_driver); | |
1348 | if (rc) | |
1349 | DBF_EVENT(3, "34xx init failed\n"); | |
1350 | else | |
1351 | DBF_EVENT(3, "34xx registered\n"); | |
1352 | return rc; | |
1353 | } | |
1354 | ||
1355 | static void | |
1356 | tape_34xx_exit(void) | |
1357 | { | |
1358 | ccw_driver_unregister(&tape_34xx_driver); | |
1359 | ||
1360 | debug_unregister(TAPE_DBF_AREA); | |
1361 | } | |
1362 | ||
1363 | MODULE_DEVICE_TABLE(ccw, tape_34xx_ids); | |
1364 | MODULE_AUTHOR("(C) 2001-2002 IBM Deutschland Entwicklung GmbH"); | |
e018ba1f | 1365 | MODULE_DESCRIPTION("Linux on zSeries channel attached 3480 tape device driver"); |
1da177e4 LT |
1366 | MODULE_LICENSE("GPL"); |
1367 | ||
1368 | module_init(tape_34xx_init); | |
1369 | module_exit(tape_34xx_exit); |