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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 | ||
ab640db0 CO |
11 | #define KMSG_COMPONENT "tape" |
12 | ||
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> | |
15 | #include <linux/bio.h> | |
16 | #include <linux/workqueue.h> | |
17 | ||
18 | #define TAPE_DBF_AREA tape_34xx_dbf | |
19 | ||
20 | #include "tape.h" | |
21 | #include "tape_std.h" | |
22 | ||
1da177e4 LT |
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); | |
ab640db0 | 206 | tape_dump_sense_dbf(device, NULL, irb); |
1da177e4 LT |
207 | } |
208 | return TAPE_IO_SUCCESS; | |
209 | } | |
210 | ||
211 | /* | |
212 | * Read Opposite Error Recovery Function: | |
213 | * Used, when Read Forward does not work | |
214 | */ | |
215 | static int | |
216 | tape_34xx_erp_read_opposite(struct tape_device *device, | |
217 | struct tape_request *request) | |
218 | { | |
219 | if (request->op == TO_RFO) { | |
220 | /* | |
221 | * We did read forward, but the data could not be read | |
222 | * *correctly*. We transform the request to a read backward | |
223 | * and try again. | |
224 | */ | |
225 | tape_std_read_backward(device, request); | |
226 | return tape_34xx_erp_retry(request); | |
227 | } | |
ab640db0 | 228 | |
1da177e4 LT |
229 | /* |
230 | * We tried to read forward and backward, but hat no | |
231 | * success -> failed. | |
232 | */ | |
233 | return tape_34xx_erp_failed(request, -EIO); | |
234 | } | |
235 | ||
236 | static int | |
237 | tape_34xx_erp_bug(struct tape_device *device, struct tape_request *request, | |
238 | struct irb *irb, int no) | |
239 | { | |
240 | if (request->op != TO_ASSIGN) { | |
ab640db0 CO |
241 | dev_err(&device->cdev->dev, "An unexpected condition %d " |
242 | "occurred in tape error recovery\n", no); | |
243 | tape_dump_sense_dbf(device, request, irb); | |
1da177e4 LT |
244 | } |
245 | return tape_34xx_erp_failed(request, -EIO); | |
246 | } | |
247 | ||
248 | /* | |
249 | * Handle data overrun between cu and drive. The channel speed might | |
250 | * be too slow. | |
251 | */ | |
252 | static int | |
253 | tape_34xx_erp_overrun(struct tape_device *device, struct tape_request *request, | |
254 | struct irb *irb) | |
255 | { | |
256 | if (irb->ecw[3] == 0x40) { | |
ab640db0 CO |
257 | dev_warn (&device->cdev->dev, "A data overrun occurred between" |
258 | " the control unit and tape unit\n"); | |
1da177e4 LT |
259 | return tape_34xx_erp_failed(request, -EIO); |
260 | } | |
261 | return tape_34xx_erp_bug(device, request, irb, -1); | |
262 | } | |
263 | ||
264 | /* | |
265 | * Handle record sequence error. | |
266 | */ | |
267 | static int | |
268 | tape_34xx_erp_sequence(struct tape_device *device, | |
269 | struct tape_request *request, struct irb *irb) | |
270 | { | |
271 | if (irb->ecw[3] == 0x41) { | |
272 | /* | |
273 | * cu detected incorrect block-id sequence on tape. | |
274 | */ | |
ab640db0 CO |
275 | dev_warn (&device->cdev->dev, "The block ID sequence on the " |
276 | "tape is incorrect\n"); | |
1da177e4 LT |
277 | return tape_34xx_erp_failed(request, -EIO); |
278 | } | |
279 | /* | |
280 | * Record sequence error bit is set, but erpa does not | |
281 | * show record sequence error. | |
282 | */ | |
283 | return tape_34xx_erp_bug(device, request, irb, -2); | |
284 | } | |
285 | ||
286 | /* | |
287 | * This function analyses the tape's sense-data in case of a unit-check. | |
288 | * If possible, it tries to recover from the error. Else the user is | |
289 | * informed about the problem. | |
290 | */ | |
291 | static int | |
292 | tape_34xx_unit_check(struct tape_device *device, struct tape_request *request, | |
293 | struct irb *irb) | |
294 | { | |
295 | int inhibit_cu_recovery; | |
296 | __u8* sense; | |
297 | ||
298 | inhibit_cu_recovery = (*device->modeset_byte & 0x80) ? 1 : 0; | |
299 | sense = irb->ecw; | |
300 | ||
301 | #ifdef CONFIG_S390_TAPE_BLOCK | |
302 | if (request->op == TO_BLOCK) { | |
303 | /* | |
304 | * Recovery for block device requests. Set the block_position | |
305 | * to something invalid and retry. | |
306 | */ | |
307 | device->blk_data.block_position = -1; | |
308 | if (request->retries-- <= 0) | |
309 | return tape_34xx_erp_failed(request, -EIO); | |
310 | else | |
311 | return tape_34xx_erp_retry(request); | |
312 | } | |
313 | #endif | |
314 | ||
315 | if ( | |
316 | sense[0] & SENSE_COMMAND_REJECT && | |
317 | sense[1] & SENSE_WRITE_PROTECT | |
318 | ) { | |
319 | if ( | |
320 | request->op == TO_DSE || | |
321 | request->op == TO_WRI || | |
322 | request->op == TO_WTM | |
323 | ) { | |
324 | /* medium is write protected */ | |
325 | return tape_34xx_erp_failed(request, -EACCES); | |
326 | } else { | |
327 | return tape_34xx_erp_bug(device, request, irb, -3); | |
328 | } | |
329 | } | |
330 | ||
331 | /* | |
332 | * Special cases for various tape-states when reaching | |
333 | * end of recorded area | |
334 | * | |
335 | * FIXME: Maybe a special case of the special case: | |
336 | * sense[0] == SENSE_EQUIPMENT_CHECK && | |
337 | * sense[1] == SENSE_DRIVE_ONLINE && | |
338 | * sense[3] == 0x47 (Volume Fenced) | |
339 | * | |
340 | * This was caused by continued FSF or FSR after an | |
341 | * 'End Of Data'. | |
342 | */ | |
343 | if (( | |
344 | sense[0] == SENSE_DATA_CHECK || | |
345 | sense[0] == SENSE_EQUIPMENT_CHECK || | |
346 | sense[0] == SENSE_EQUIPMENT_CHECK + SENSE_DEFERRED_UNIT_CHECK | |
347 | ) && ( | |
348 | sense[1] == SENSE_DRIVE_ONLINE || | |
349 | sense[1] == SENSE_BEGINNING_OF_TAPE + SENSE_WRITE_MODE | |
350 | )) { | |
351 | switch (request->op) { | |
352 | /* | |
353 | * sense[0] == SENSE_DATA_CHECK && | |
354 | * sense[1] == SENSE_DRIVE_ONLINE | |
355 | * sense[3] == 0x36 (End Of Data) | |
356 | * | |
357 | * Further seeks might return a 'Volume Fenced'. | |
358 | */ | |
359 | case TO_FSF: | |
360 | case TO_FSB: | |
361 | /* Trying to seek beyond end of recorded area */ | |
362 | return tape_34xx_erp_failed(request, -ENOSPC); | |
363 | case TO_BSB: | |
364 | return tape_34xx_erp_retry(request); | |
365 | ||
366 | /* | |
367 | * sense[0] == SENSE_DATA_CHECK && | |
368 | * sense[1] == SENSE_DRIVE_ONLINE && | |
369 | * sense[3] == 0x36 (End Of Data) | |
370 | */ | |
371 | case TO_LBL: | |
372 | /* Block could not be located. */ | |
373 | tape_34xx_delete_sbid_from(device, 0); | |
374 | return tape_34xx_erp_failed(request, -EIO); | |
375 | ||
376 | case TO_RFO: | |
377 | /* Read beyond end of recorded area -> 0 bytes read */ | |
378 | return tape_34xx_erp_failed(request, 0); | |
379 | ||
380 | /* | |
381 | * sense[0] == SENSE_EQUIPMENT_CHECK && | |
382 | * sense[1] == SENSE_DRIVE_ONLINE && | |
383 | * sense[3] == 0x38 (Physical End Of Volume) | |
384 | */ | |
385 | case TO_WRI: | |
386 | /* Writing at physical end of volume */ | |
387 | return tape_34xx_erp_failed(request, -ENOSPC); | |
388 | default: | |
1da177e4 LT |
389 | return tape_34xx_erp_failed(request, 0); |
390 | } | |
391 | } | |
392 | ||
393 | /* Sensing special bits */ | |
394 | if (sense[0] & SENSE_BUS_OUT_CHECK) | |
395 | return tape_34xx_erp_retry(request); | |
396 | ||
397 | if (sense[0] & SENSE_DATA_CHECK) { | |
398 | /* | |
399 | * hardware failure, damaged tape or improper | |
400 | * operating conditions | |
401 | */ | |
402 | switch (sense[3]) { | |
403 | case 0x23: | |
404 | /* a read data check occurred */ | |
405 | if ((sense[2] & SENSE_TAPE_SYNC_MODE) || | |
406 | inhibit_cu_recovery) | |
407 | // data check is not permanent, may be | |
408 | // recovered. We always use async-mode with | |
409 | // cu-recovery, so this should *never* happen. | |
410 | return tape_34xx_erp_bug(device, request, | |
411 | irb, -4); | |
412 | ||
413 | /* data check is permanent, CU recovery has failed */ | |
ab640db0 CO |
414 | dev_warn (&device->cdev->dev, "A read error occurred " |
415 | "that cannot be recovered\n"); | |
1da177e4 LT |
416 | return tape_34xx_erp_failed(request, -EIO); |
417 | case 0x25: | |
418 | // a write data check occurred | |
419 | if ((sense[2] & SENSE_TAPE_SYNC_MODE) || | |
420 | inhibit_cu_recovery) | |
421 | // data check is not permanent, may be | |
422 | // recovered. We always use async-mode with | |
423 | // cu-recovery, so this should *never* happen. | |
424 | return tape_34xx_erp_bug(device, request, | |
425 | irb, -5); | |
426 | ||
427 | // data check is permanent, cu-recovery has failed | |
ab640db0 CO |
428 | dev_warn (&device->cdev->dev, "A write error on the " |
429 | "tape cannot be recovered\n"); | |
1da177e4 LT |
430 | return tape_34xx_erp_failed(request, -EIO); |
431 | case 0x26: | |
432 | /* Data Check (read opposite) occurred. */ | |
433 | return tape_34xx_erp_read_opposite(device, request); | |
434 | case 0x28: | |
435 | /* ID-Mark at tape start couldn't be written */ | |
ab640db0 CO |
436 | dev_warn (&device->cdev->dev, "Writing the ID-mark " |
437 | "failed\n"); | |
1da177e4 LT |
438 | return tape_34xx_erp_failed(request, -EIO); |
439 | case 0x31: | |
440 | /* Tape void. Tried to read beyond end of device. */ | |
ab640db0 CO |
441 | dev_warn (&device->cdev->dev, "Reading the tape beyond" |
442 | " the end of the recorded area failed\n"); | |
1da177e4 LT |
443 | return tape_34xx_erp_failed(request, -ENOSPC); |
444 | case 0x41: | |
445 | /* Record sequence error. */ | |
ab640db0 CO |
446 | dev_warn (&device->cdev->dev, "The tape contains an " |
447 | "incorrect block ID sequence\n"); | |
1da177e4 LT |
448 | return tape_34xx_erp_failed(request, -EIO); |
449 | default: | |
450 | /* all data checks for 3480 should result in one of | |
451 | * the above erpa-codes. For 3490, other data-check | |
452 | * conditions do exist. */ | |
453 | if (device->cdev->id.driver_info == tape_3480) | |
454 | return tape_34xx_erp_bug(device, request, | |
455 | irb, -6); | |
456 | } | |
457 | } | |
458 | ||
459 | if (sense[0] & SENSE_OVERRUN) | |
460 | return tape_34xx_erp_overrun(device, request, irb); | |
461 | ||
462 | if (sense[1] & SENSE_RECORD_SEQUENCE_ERR) | |
463 | return tape_34xx_erp_sequence(device, request, irb); | |
464 | ||
465 | /* Sensing erpa codes */ | |
466 | switch (sense[3]) { | |
467 | case 0x00: | |
468 | /* Unit check with erpa code 0. Report and ignore. */ | |
1da177e4 LT |
469 | return TAPE_IO_SUCCESS; |
470 | case 0x21: | |
471 | /* | |
472 | * Data streaming not operational. CU will switch to | |
473 | * interlock mode. Reissue the command. | |
474 | */ | |
1da177e4 LT |
475 | return tape_34xx_erp_retry(request); |
476 | case 0x22: | |
477 | /* | |
478 | * Path equipment check. Might be drive adapter error, buffer | |
479 | * error on the lower interface, internal path not usable, | |
480 | * or error during cartridge load. | |
481 | */ | |
ab640db0 CO |
482 | dev_warn (&device->cdev->dev, "A path equipment check occurred" |
483 | " for the tape device\n"); | |
1da177e4 LT |
484 | return tape_34xx_erp_failed(request, -EIO); |
485 | case 0x24: | |
486 | /* | |
487 | * Load display check. Load display was command was issued, | |
488 | * but the drive is displaying a drive check message. Can | |
489 | * be threated as "device end". | |
490 | */ | |
491 | return tape_34xx_erp_succeeded(request); | |
492 | case 0x27: | |
493 | /* | |
494 | * Command reject. May indicate illegal channel program or | |
495 | * buffer over/underrun. Since all channel programs are | |
496 | * issued by this driver and ought be correct, we assume a | |
497 | * over/underrun situation and retry the channel program. | |
498 | */ | |
499 | return tape_34xx_erp_retry(request); | |
500 | case 0x29: | |
501 | /* | |
502 | * Function incompatible. Either the tape is idrc compressed | |
503 | * but the hardware isn't capable to do idrc, or a perform | |
504 | * subsystem func is issued and the CU is not on-line. | |
505 | */ | |
1da177e4 LT |
506 | return tape_34xx_erp_failed(request, -EIO); |
507 | case 0x2a: | |
508 | /* | |
509 | * Unsolicited environmental data. An internal counter | |
510 | * overflows, we can ignore this and reissue the cmd. | |
511 | */ | |
512 | return tape_34xx_erp_retry(request); | |
513 | case 0x2b: | |
514 | /* | |
515 | * Environmental data present. Indicates either unload | |
516 | * completed ok or read buffered log command completed ok. | |
517 | */ | |
518 | if (request->op == TO_RUN) { | |
519 | /* Rewind unload completed ok. */ | |
520 | tape_med_state_set(device, MS_UNLOADED); | |
521 | return tape_34xx_erp_succeeded(request); | |
522 | } | |
523 | /* tape_34xx doesn't use read buffered log commands. */ | |
524 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
525 | case 0x2c: | |
526 | /* | |
527 | * Permanent equipment check. CU has tried recovery, but | |
528 | * did not succeed. | |
529 | */ | |
530 | return tape_34xx_erp_failed(request, -EIO); | |
531 | case 0x2d: | |
532 | /* Data security erase failure. */ | |
533 | if (request->op == TO_DSE) | |
534 | return tape_34xx_erp_failed(request, -EIO); | |
535 | /* Data security erase failure, but no such command issued. */ | |
536 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
537 | case 0x2e: | |
538 | /* | |
539 | * Not capable. This indicates either that the drive fails | |
540 | * reading the format id mark or that that format specified | |
541 | * is not supported by the drive. | |
542 | */ | |
ab640db0 CO |
543 | dev_warn (&device->cdev->dev, "The tape unit cannot process " |
544 | "the tape format\n"); | |
1da177e4 LT |
545 | return tape_34xx_erp_failed(request, -EMEDIUMTYPE); |
546 | case 0x30: | |
547 | /* The medium is write protected. */ | |
ab640db0 CO |
548 | dev_warn (&device->cdev->dev, "The tape medium is write-" |
549 | "protected\n"); | |
1da177e4 LT |
550 | return tape_34xx_erp_failed(request, -EACCES); |
551 | case 0x32: | |
552 | // Tension loss. We cannot recover this, it's an I/O error. | |
ab640db0 CO |
553 | dev_warn (&device->cdev->dev, "The tape does not have the " |
554 | "required tape tension\n"); | |
1da177e4 LT |
555 | return tape_34xx_erp_failed(request, -EIO); |
556 | case 0x33: | |
557 | /* | |
558 | * Load Failure. The cartridge was not inserted correctly or | |
559 | * the tape is not threaded correctly. | |
560 | */ | |
ab640db0 CO |
561 | dev_warn (&device->cdev->dev, "The tape unit failed to load" |
562 | " the cartridge\n"); | |
1da177e4 LT |
563 | tape_34xx_delete_sbid_from(device, 0); |
564 | return tape_34xx_erp_failed(request, -EIO); | |
565 | case 0x34: | |
566 | /* | |
567 | * Unload failure. The drive cannot maintain tape tension | |
568 | * and control tape movement during an unload operation. | |
569 | */ | |
ab640db0 CO |
570 | dev_warn (&device->cdev->dev, "Automatic unloading of the tape" |
571 | " cartridge failed\n"); | |
1da177e4 LT |
572 | if (request->op == TO_RUN) |
573 | return tape_34xx_erp_failed(request, -EIO); | |
574 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
575 | case 0x35: | |
576 | /* | |
577 | * Drive equipment check. One of the following: | |
578 | * - cu cannot recover from a drive detected error | |
579 | * - a check code message is shown on drive display | |
580 | * - the cartridge loader does not respond correctly | |
581 | * - a failure occurs during an index, load, or unload cycle | |
582 | */ | |
ab640db0 CO |
583 | dev_warn (&device->cdev->dev, "An equipment check has occurred" |
584 | " on the tape unit\n"); | |
1da177e4 LT |
585 | return tape_34xx_erp_failed(request, -EIO); |
586 | case 0x36: | |
587 | if (device->cdev->id.driver_info == tape_3490) | |
588 | /* End of data. */ | |
589 | return tape_34xx_erp_failed(request, -EIO); | |
590 | /* This erpa is reserved for 3480 */ | |
591 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
592 | case 0x37: | |
593 | /* | |
594 | * Tape length error. The tape is shorter than reported in | |
595 | * the beginning-of-tape data. | |
596 | */ | |
ab640db0 CO |
597 | dev_warn (&device->cdev->dev, "The tape information states an" |
598 | " incorrect length\n"); | |
1da177e4 LT |
599 | return tape_34xx_erp_failed(request, -EIO); |
600 | case 0x38: | |
601 | /* | |
602 | * Physical end of tape. A read/write operation reached | |
603 | * the physical end of tape. | |
604 | */ | |
605 | if (request->op==TO_WRI || | |
606 | request->op==TO_DSE || | |
607 | request->op==TO_WTM) | |
608 | return tape_34xx_erp_failed(request, -ENOSPC); | |
609 | return tape_34xx_erp_failed(request, -EIO); | |
610 | case 0x39: | |
611 | /* Backward at Beginning of tape. */ | |
612 | return tape_34xx_erp_failed(request, -EIO); | |
613 | case 0x3a: | |
614 | /* Drive switched to not ready. */ | |
ab640db0 | 615 | dev_warn (&device->cdev->dev, "The tape unit is not ready\n"); |
1da177e4 LT |
616 | return tape_34xx_erp_failed(request, -EIO); |
617 | case 0x3b: | |
618 | /* Manual rewind or unload. This causes an I/O error. */ | |
ab640db0 CO |
619 | dev_warn (&device->cdev->dev, "The tape medium has been " |
620 | "rewound or unloaded manually\n"); | |
1da177e4 LT |
621 | tape_34xx_delete_sbid_from(device, 0); |
622 | return tape_34xx_erp_failed(request, -EIO); | |
623 | case 0x42: | |
624 | /* | |
625 | * Degraded mode. A condition that can cause degraded | |
626 | * performance is detected. | |
627 | */ | |
ab640db0 CO |
628 | dev_warn (&device->cdev->dev, "The tape subsystem is running " |
629 | "in degraded mode\n"); | |
1da177e4 LT |
630 | return tape_34xx_erp_retry(request); |
631 | case 0x43: | |
632 | /* Drive not ready. */ | |
633 | tape_34xx_delete_sbid_from(device, 0); | |
634 | tape_med_state_set(device, MS_UNLOADED); | |
635 | /* Some commands commands are successful even in this case */ | |
636 | if (sense[1] & SENSE_DRIVE_ONLINE) { | |
637 | switch(request->op) { | |
638 | case TO_ASSIGN: | |
639 | case TO_UNASSIGN: | |
640 | case TO_DIS: | |
641 | case TO_NOP: | |
642 | return tape_34xx_done(request); | |
643 | break; | |
644 | default: | |
645 | break; | |
646 | } | |
647 | } | |
1da177e4 LT |
648 | return tape_34xx_erp_failed(request, -ENOMEDIUM); |
649 | case 0x44: | |
650 | /* Locate Block unsuccessful. */ | |
651 | if (request->op != TO_BLOCK && request->op != TO_LBL) | |
652 | /* No locate block was issued. */ | |
653 | return tape_34xx_erp_bug(device, request, | |
654 | irb, sense[3]); | |
655 | return tape_34xx_erp_failed(request, -EIO); | |
656 | case 0x45: | |
657 | /* The drive is assigned to a different channel path. */ | |
ab640db0 CO |
658 | dev_warn (&device->cdev->dev, "The tape unit is already " |
659 | "assigned\n"); | |
1da177e4 LT |
660 | return tape_34xx_erp_failed(request, -EIO); |
661 | case 0x46: | |
662 | /* | |
663 | * Drive not on-line. Drive may be switched offline, | |
664 | * the power supply may be switched off or | |
665 | * the drive address may not be set correctly. | |
666 | */ | |
ab640db0 | 667 | dev_warn (&device->cdev->dev, "The tape unit is not online\n"); |
1da177e4 LT |
668 | return tape_34xx_erp_failed(request, -EIO); |
669 | case 0x47: | |
670 | /* Volume fenced. CU reports volume integrity is lost. */ | |
ab640db0 CO |
671 | dev_warn (&device->cdev->dev, "The control unit has fenced " |
672 | "access to the tape volume\n"); | |
1da177e4 LT |
673 | tape_34xx_delete_sbid_from(device, 0); |
674 | return tape_34xx_erp_failed(request, -EIO); | |
675 | case 0x48: | |
676 | /* Log sense data and retry request. */ | |
677 | return tape_34xx_erp_retry(request); | |
678 | case 0x49: | |
679 | /* Bus out check. A parity check error on the bus was found. */ | |
ab640db0 CO |
680 | dev_warn (&device->cdev->dev, "A parity error occurred on the " |
681 | "tape bus\n"); | |
1da177e4 LT |
682 | return tape_34xx_erp_failed(request, -EIO); |
683 | case 0x4a: | |
684 | /* Control unit erp failed. */ | |
ab640db0 CO |
685 | dev_warn (&device->cdev->dev, "I/O error recovery failed on " |
686 | "the tape control unit\n"); | |
1da177e4 LT |
687 | return tape_34xx_erp_failed(request, -EIO); |
688 | case 0x4b: | |
689 | /* | |
690 | * CU and drive incompatible. The drive requests micro-program | |
691 | * patches, which are not available on the CU. | |
692 | */ | |
ab640db0 CO |
693 | dev_warn (&device->cdev->dev, "The tape unit requires a " |
694 | "firmware update\n"); | |
1da177e4 LT |
695 | return tape_34xx_erp_failed(request, -EIO); |
696 | case 0x4c: | |
697 | /* | |
698 | * Recovered Check-One failure. Cu develops a hardware error, | |
699 | * but is able to recover. | |
700 | */ | |
701 | return tape_34xx_erp_retry(request); | |
702 | case 0x4d: | |
703 | if (device->cdev->id.driver_info == tape_3490) | |
704 | /* | |
705 | * Resetting event received. Since the driver does | |
706 | * not support resetting event recovery (which has to | |
707 | * be handled by the I/O Layer), retry our command. | |
708 | */ | |
709 | return tape_34xx_erp_retry(request); | |
710 | /* This erpa is reserved for 3480. */ | |
711 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
712 | case 0x4e: | |
713 | if (device->cdev->id.driver_info == tape_3490) { | |
714 | /* | |
715 | * Maximum block size exceeded. This indicates, that | |
716 | * the block to be written is larger than allowed for | |
717 | * buffered mode. | |
718 | */ | |
ab640db0 CO |
719 | dev_warn (&device->cdev->dev, "The maximum block size" |
720 | " for buffered mode is exceeded\n"); | |
1da177e4 LT |
721 | return tape_34xx_erp_failed(request, -ENOBUFS); |
722 | } | |
723 | /* This erpa is reserved for 3480. */ | |
724 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
725 | case 0x50: | |
726 | /* | |
727 | * Read buffered log (Overflow). CU is running in extended | |
728 | * buffered log mode, and a counter overflows. This should | |
729 | * never happen, since we're never running in extended | |
730 | * buffered log mode. | |
731 | */ | |
732 | return tape_34xx_erp_retry(request); | |
733 | case 0x51: | |
734 | /* | |
735 | * Read buffered log (EOV). EOF processing occurs while the | |
736 | * CU is in extended buffered log mode. This should never | |
737 | * happen, since we're never running in extended buffered | |
738 | * log mode. | |
739 | */ | |
740 | return tape_34xx_erp_retry(request); | |
741 | case 0x52: | |
742 | /* End of Volume complete. Rewind unload completed ok. */ | |
743 | if (request->op == TO_RUN) { | |
744 | tape_med_state_set(device, MS_UNLOADED); | |
745 | tape_34xx_delete_sbid_from(device, 0); | |
746 | return tape_34xx_erp_succeeded(request); | |
747 | } | |
748 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
749 | case 0x53: | |
750 | /* Global command intercept. */ | |
751 | return tape_34xx_erp_retry(request); | |
752 | case 0x54: | |
753 | /* Channel interface recovery (temporary). */ | |
754 | return tape_34xx_erp_retry(request); | |
755 | case 0x55: | |
756 | /* Channel interface recovery (permanent). */ | |
ab640db0 CO |
757 | dev_warn (&device->cdev->dev, "A channel interface error cannot be" |
758 | " recovered\n"); | |
1da177e4 LT |
759 | return tape_34xx_erp_failed(request, -EIO); |
760 | case 0x56: | |
761 | /* Channel protocol error. */ | |
ab640db0 CO |
762 | dev_warn (&device->cdev->dev, "A channel protocol error " |
763 | "occurred\n"); | |
1da177e4 LT |
764 | return tape_34xx_erp_failed(request, -EIO); |
765 | case 0x57: | |
766 | if (device->cdev->id.driver_info == tape_3480) { | |
767 | /* Attention intercept. */ | |
1da177e4 LT |
768 | return tape_34xx_erp_retry(request); |
769 | } else { | |
770 | /* Global status intercept. */ | |
1da177e4 LT |
771 | return tape_34xx_erp_retry(request); |
772 | } | |
773 | case 0x5a: | |
774 | /* | |
775 | * Tape length incompatible. The tape inserted is too long, | |
776 | * which could cause damage to the tape or the drive. | |
777 | */ | |
ab640db0 CO |
778 | dev_warn (&device->cdev->dev, "The tape unit does not support " |
779 | "the tape length\n"); | |
1da177e4 LT |
780 | return tape_34xx_erp_failed(request, -EIO); |
781 | case 0x5b: | |
782 | /* Format 3480 XF incompatible */ | |
783 | if (sense[1] & SENSE_BEGINNING_OF_TAPE) | |
784 | /* The tape will get overwritten. */ | |
785 | return tape_34xx_erp_retry(request); | |
ab640db0 CO |
786 | dev_warn (&device->cdev->dev, "The tape unit does not support" |
787 | " format 3480 XF\n"); | |
1da177e4 LT |
788 | return tape_34xx_erp_failed(request, -EIO); |
789 | case 0x5c: | |
790 | /* Format 3480-2 XF incompatible */ | |
ab640db0 CO |
791 | dev_warn (&device->cdev->dev, "The tape unit does not support tape " |
792 | "format 3480-2 XF\n"); | |
1da177e4 LT |
793 | return tape_34xx_erp_failed(request, -EIO); |
794 | case 0x5d: | |
795 | /* Tape length violation. */ | |
ab640db0 CO |
796 | dev_warn (&device->cdev->dev, "The tape unit does not support" |
797 | " the current tape length\n"); | |
1da177e4 LT |
798 | return tape_34xx_erp_failed(request, -EMEDIUMTYPE); |
799 | case 0x5e: | |
800 | /* Compaction algorithm incompatible. */ | |
ab640db0 CO |
801 | dev_warn (&device->cdev->dev, "The tape unit does not support" |
802 | " the compaction algorithm\n"); | |
1da177e4 LT |
803 | return tape_34xx_erp_failed(request, -EMEDIUMTYPE); |
804 | ||
805 | /* The following erpas should have been covered earlier. */ | |
806 | case 0x23: /* Read data check. */ | |
807 | case 0x25: /* Write data check. */ | |
808 | case 0x26: /* Data check (read opposite). */ | |
809 | case 0x28: /* Write id mark check. */ | |
810 | case 0x31: /* Tape void. */ | |
811 | case 0x40: /* Overrun error. */ | |
812 | case 0x41: /* Record sequence error. */ | |
813 | /* All other erpas are reserved for future use. */ | |
814 | default: | |
815 | return tape_34xx_erp_bug(device, request, irb, sense[3]); | |
816 | } | |
817 | } | |
818 | ||
819 | /* | |
820 | * 3480/3490 interrupt handler | |
821 | */ | |
822 | static int | |
823 | tape_34xx_irq(struct tape_device *device, struct tape_request *request, | |
824 | struct irb *irb) | |
825 | { | |
826 | if (request == NULL) | |
827 | return tape_34xx_unsolicited_irq(device, irb); | |
828 | ||
23d805b6 PO |
829 | if ((irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) && |
830 | (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) && | |
1da177e4 LT |
831 | (request->op == TO_WRI)) { |
832 | /* Write at end of volume */ | |
1da177e4 LT |
833 | return tape_34xx_erp_failed(request, -ENOSPC); |
834 | } | |
835 | ||
23d805b6 | 836 | if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) |
1da177e4 LT |
837 | return tape_34xx_unit_check(device, request, irb); |
838 | ||
23d805b6 | 839 | if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) { |
1da177e4 LT |
840 | /* |
841 | * A unit exception occurs on skipping over a tapemark block. | |
842 | */ | |
23d805b6 | 843 | if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) { |
1da177e4 LT |
844 | if (request->op == TO_BSB || request->op == TO_FSB) |
845 | request->rescnt++; | |
846 | else | |
847 | DBF_EVENT(5, "Unit Exception!\n"); | |
848 | } | |
849 | return tape_34xx_done(request); | |
850 | } | |
851 | ||
852 | DBF_EVENT(6, "xunknownirq\n"); | |
ab640db0 | 853 | tape_dump_sense_dbf(device, request, irb); |
1da177e4 LT |
854 | return TAPE_IO_STOP; |
855 | } | |
856 | ||
857 | /* | |
858 | * ioctl_overload | |
859 | */ | |
860 | static int | |
861 | tape_34xx_ioctl(struct tape_device *device, unsigned int cmd, unsigned long arg) | |
862 | { | |
863 | if (cmd == TAPE390_DISPLAY) { | |
864 | struct display_struct disp; | |
865 | ||
866 | if (copy_from_user(&disp, (char __user *) arg, sizeof(disp)) != 0) | |
867 | return -EFAULT; | |
868 | ||
869 | return tape_std_display(device, &disp); | |
870 | } else | |
871 | return -EINVAL; | |
872 | } | |
873 | ||
874 | static inline void | |
875 | tape_34xx_append_new_sbid(struct tape_34xx_block_id bid, struct list_head *l) | |
876 | { | |
877 | struct tape_34xx_sbid * new_sbid; | |
878 | ||
879 | new_sbid = kmalloc(sizeof(*new_sbid), GFP_ATOMIC); | |
880 | if (!new_sbid) | |
881 | return; | |
882 | ||
883 | new_sbid->bid = bid; | |
884 | list_add(&new_sbid->list, l); | |
885 | } | |
886 | ||
887 | /* | |
888 | * Build up the search block ID list. The block ID consists of a logical | |
889 | * block number and a hardware specific part. The hardware specific part | |
890 | * helps the tape drive to speed up searching for a specific block. | |
891 | */ | |
892 | static void | |
893 | tape_34xx_add_sbid(struct tape_device *device, struct tape_34xx_block_id bid) | |
894 | { | |
895 | struct list_head * sbid_list; | |
896 | struct tape_34xx_sbid * sbid; | |
897 | struct list_head * l; | |
898 | ||
899 | /* | |
900 | * immediately return if there is no list at all or the block to add | |
901 | * is located in segment 1 of wrap 0 because this position is used | |
902 | * if no hardware position data is supplied. | |
903 | */ | |
904 | sbid_list = (struct list_head *) device->discdata; | |
905 | if (!sbid_list || (bid.segment < 2 && bid.wrap == 0)) | |
906 | return; | |
907 | ||
908 | /* | |
909 | * Search the position where to insert the new entry. Hardware | |
910 | * acceleration uses only the segment and wrap number. So we | |
911 | * need only one entry for a specific wrap/segment combination. | |
912 | * If there is a block with a lower number but the same hard- | |
913 | * ware position data we just update the block number in the | |
914 | * existing entry. | |
915 | */ | |
916 | list_for_each(l, sbid_list) { | |
917 | sbid = list_entry(l, struct tape_34xx_sbid, list); | |
918 | ||
919 | if ( | |
920 | (sbid->bid.segment == bid.segment) && | |
921 | (sbid->bid.wrap == bid.wrap) | |
922 | ) { | |
923 | if (bid.block < sbid->bid.block) | |
924 | sbid->bid = bid; | |
925 | else return; | |
926 | break; | |
927 | } | |
928 | ||
929 | /* Sort in according to logical block number. */ | |
930 | if (bid.block < sbid->bid.block) { | |
931 | tape_34xx_append_new_sbid(bid, l->prev); | |
932 | break; | |
933 | } | |
934 | } | |
935 | /* List empty or new block bigger than last entry. */ | |
936 | if (l == sbid_list) | |
937 | tape_34xx_append_new_sbid(bid, l->prev); | |
938 | ||
939 | DBF_LH(4, "Current list is:\n"); | |
940 | list_for_each(l, sbid_list) { | |
941 | sbid = list_entry(l, struct tape_34xx_sbid, list); | |
942 | DBF_LH(4, "%d:%03d@%05d\n", | |
943 | sbid->bid.wrap, | |
944 | sbid->bid.segment, | |
945 | sbid->bid.block | |
946 | ); | |
947 | } | |
948 | } | |
949 | ||
950 | /* | |
951 | * Delete all entries from the search block ID list that belong to tape blocks | |
952 | * equal or higher than the given number. | |
953 | */ | |
954 | static void | |
955 | tape_34xx_delete_sbid_from(struct tape_device *device, int from) | |
956 | { | |
957 | struct list_head * sbid_list; | |
958 | struct tape_34xx_sbid * sbid; | |
959 | struct list_head * l; | |
960 | struct list_head * n; | |
961 | ||
962 | sbid_list = (struct list_head *) device->discdata; | |
963 | if (!sbid_list) | |
964 | return; | |
965 | ||
966 | list_for_each_safe(l, n, sbid_list) { | |
967 | sbid = list_entry(l, struct tape_34xx_sbid, list); | |
968 | if (sbid->bid.block >= from) { | |
969 | DBF_LH(4, "Delete sbid %d:%03d@%05d\n", | |
970 | sbid->bid.wrap, | |
971 | sbid->bid.segment, | |
972 | sbid->bid.block | |
973 | ); | |
974 | list_del(l); | |
975 | kfree(sbid); | |
976 | } | |
977 | } | |
978 | } | |
979 | ||
980 | /* | |
981 | * Merge hardware position data into a block id. | |
982 | */ | |
983 | static void | |
984 | tape_34xx_merge_sbid( | |
985 | struct tape_device * device, | |
986 | struct tape_34xx_block_id * bid | |
987 | ) { | |
988 | struct tape_34xx_sbid * sbid; | |
989 | struct tape_34xx_sbid * sbid_to_use; | |
990 | struct list_head * sbid_list; | |
991 | struct list_head * l; | |
992 | ||
993 | sbid_list = (struct list_head *) device->discdata; | |
994 | bid->wrap = 0; | |
995 | bid->segment = 1; | |
996 | ||
997 | if (!sbid_list || list_empty(sbid_list)) | |
998 | return; | |
999 | ||
1000 | sbid_to_use = NULL; | |
1001 | list_for_each(l, sbid_list) { | |
1002 | sbid = list_entry(l, struct tape_34xx_sbid, list); | |
1003 | ||
1004 | if (sbid->bid.block >= bid->block) | |
1005 | break; | |
1006 | sbid_to_use = sbid; | |
1007 | } | |
1008 | if (sbid_to_use) { | |
1009 | bid->wrap = sbid_to_use->bid.wrap; | |
1010 | bid->segment = sbid_to_use->bid.segment; | |
1011 | DBF_LH(4, "Use %d:%03d@%05d for %05d\n", | |
1012 | sbid_to_use->bid.wrap, | |
1013 | sbid_to_use->bid.segment, | |
1014 | sbid_to_use->bid.block, | |
1015 | bid->block | |
1016 | ); | |
1017 | } | |
1018 | } | |
1019 | ||
1020 | static int | |
1021 | tape_34xx_setup_device(struct tape_device * device) | |
1022 | { | |
1023 | int rc; | |
1024 | struct list_head * discdata; | |
1025 | ||
1026 | DBF_EVENT(6, "34xx device setup\n"); | |
1027 | if ((rc = tape_std_assign(device)) == 0) { | |
1028 | if ((rc = tape_34xx_medium_sense(device)) != 0) { | |
1029 | DBF_LH(3, "34xx medium sense returned %d\n", rc); | |
1030 | } | |
1031 | } | |
1032 | discdata = kmalloc(sizeof(struct list_head), GFP_KERNEL); | |
1033 | if (discdata) { | |
1034 | INIT_LIST_HEAD(discdata); | |
1035 | device->discdata = discdata; | |
1036 | } | |
1037 | ||
1038 | return rc; | |
1039 | } | |
1040 | ||
1041 | static void | |
1042 | tape_34xx_cleanup_device(struct tape_device *device) | |
1043 | { | |
1044 | tape_std_unassign(device); | |
1045 | ||
1046 | if (device->discdata) { | |
1047 | tape_34xx_delete_sbid_from(device, 0); | |
1048 | kfree(device->discdata); | |
1049 | device->discdata = NULL; | |
1050 | } | |
1051 | } | |
1052 | ||
1053 | ||
1054 | /* | |
1055 | * MTTELL: Tell block. Return the number of block relative to current file. | |
1056 | */ | |
1057 | static int | |
1058 | tape_34xx_mttell(struct tape_device *device, int mt_count) | |
1059 | { | |
1060 | struct { | |
1061 | struct tape_34xx_block_id cbid; | |
1062 | struct tape_34xx_block_id dbid; | |
1063 | } __attribute__ ((packed)) block_id; | |
1064 | int rc; | |
1065 | ||
1066 | rc = tape_std_read_block_id(device, (__u64 *) &block_id); | |
1067 | if (rc) | |
1068 | return rc; | |
1069 | ||
1070 | tape_34xx_add_sbid(device, block_id.cbid); | |
1071 | return block_id.cbid.block; | |
1072 | } | |
1073 | ||
1074 | /* | |
1075 | * MTSEEK: seek to the specified block. | |
1076 | */ | |
1077 | static int | |
1078 | tape_34xx_mtseek(struct tape_device *device, int mt_count) | |
1079 | { | |
1080 | struct tape_request *request; | |
1081 | struct tape_34xx_block_id * bid; | |
1082 | ||
1083 | if (mt_count > 0x3fffff) { | |
1084 | DBF_EXCEPTION(6, "xsee parm\n"); | |
1085 | return -EINVAL; | |
1086 | } | |
1087 | request = tape_alloc_request(3, 4); | |
1088 | if (IS_ERR(request)) | |
1089 | return PTR_ERR(request); | |
1090 | ||
1091 | /* setup ccws */ | |
1092 | request->op = TO_LBL; | |
1093 | bid = (struct tape_34xx_block_id *) request->cpdata; | |
1094 | bid->format = (*device->modeset_byte & 0x08) ? | |
1095 | TAPE34XX_FMT_3480_XF : TAPE34XX_FMT_3480; | |
1096 | bid->block = mt_count; | |
1097 | tape_34xx_merge_sbid(device, bid); | |
1098 | ||
1099 | tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); | |
1100 | tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata); | |
1101 | tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); | |
1102 | ||
1103 | /* execute it */ | |
1104 | return tape_do_io_free(device, request); | |
1105 | } | |
1106 | ||
1107 | #ifdef CONFIG_S390_TAPE_BLOCK | |
1108 | /* | |
1109 | * Tape block read for 34xx. | |
1110 | */ | |
1111 | static struct tape_request * | |
1112 | tape_34xx_bread(struct tape_device *device, struct request *req) | |
1113 | { | |
1114 | struct tape_request *request; | |
1115 | struct ccw1 *ccw; | |
5705f702 | 1116 | int count = 0; |
1da177e4 LT |
1117 | unsigned off; |
1118 | char *dst; | |
1119 | struct bio_vec *bv; | |
5705f702 | 1120 | struct req_iterator iter; |
1da177e4 LT |
1121 | struct tape_34xx_block_id * start_block; |
1122 | ||
1123 | DBF_EVENT(6, "xBREDid:"); | |
1124 | ||
1125 | /* Count the number of blocks for the request. */ | |
5705f702 N |
1126 | rq_for_each_segment(bv, req, iter) |
1127 | count += bv->bv_len >> (TAPEBLOCK_HSEC_S2B + 9); | |
1da177e4 LT |
1128 | |
1129 | /* Allocate the ccw request. */ | |
1130 | request = tape_alloc_request(3+count+1, 8); | |
1131 | if (IS_ERR(request)) | |
1132 | return request; | |
1133 | ||
1134 | /* Setup ccws. */ | |
1135 | request->op = TO_BLOCK; | |
1136 | start_block = (struct tape_34xx_block_id *) request->cpdata; | |
83096ebf | 1137 | start_block->block = blk_rq_pos(req) >> TAPEBLOCK_HSEC_S2B; |
1da177e4 LT |
1138 | DBF_EVENT(6, "start_block = %i\n", start_block->block); |
1139 | ||
1140 | ccw = request->cpaddr; | |
1141 | ccw = tape_ccw_cc(ccw, MODE_SET_DB, 1, device->modeset_byte); | |
1142 | ||
1143 | /* | |
1144 | * We always setup a nop after the mode set ccw. This slot is | |
1145 | * used in tape_std_check_locate to insert a locate ccw if the | |
1146 | * current tape position doesn't match the start block to be read. | |
1147 | * The second nop will be filled with a read block id which is in | |
1148 | * turn used by tape_34xx_free_bread to populate the segment bid | |
1149 | * table. | |
1150 | */ | |
1151 | ccw = tape_ccw_cc(ccw, NOP, 0, NULL); | |
1152 | ccw = tape_ccw_cc(ccw, NOP, 0, NULL); | |
1153 | ||
5705f702 | 1154 | rq_for_each_segment(bv, req, iter) { |
6c92e699 JA |
1155 | dst = kmap(bv->bv_page) + bv->bv_offset; |
1156 | for (off = 0; off < bv->bv_len; off += TAPEBLOCK_HSEC_SIZE) { | |
1157 | ccw->flags = CCW_FLAG_CC; | |
1158 | ccw->cmd_code = READ_FORWARD; | |
1159 | ccw->count = TAPEBLOCK_HSEC_SIZE; | |
1160 | set_normalized_cda(ccw, (void*) __pa(dst)); | |
1161 | ccw++; | |
1162 | dst += TAPEBLOCK_HSEC_SIZE; | |
1163 | } | |
1da177e4 LT |
1164 | } |
1165 | ||
1166 | ccw = tape_ccw_end(ccw, NOP, 0, NULL); | |
1167 | DBF_EVENT(6, "xBREDccwg\n"); | |
1168 | return request; | |
1169 | } | |
1170 | ||
1171 | static void | |
1172 | tape_34xx_free_bread (struct tape_request *request) | |
1173 | { | |
1174 | struct ccw1* ccw; | |
1175 | ||
1176 | ccw = request->cpaddr; | |
1177 | if ((ccw + 2)->cmd_code == READ_BLOCK_ID) { | |
1178 | struct { | |
1179 | struct tape_34xx_block_id cbid; | |
1180 | struct tape_34xx_block_id dbid; | |
1181 | } __attribute__ ((packed)) *rbi_data; | |
1182 | ||
1183 | rbi_data = request->cpdata; | |
1184 | ||
1185 | if (request->device) | |
1186 | tape_34xx_add_sbid(request->device, rbi_data->cbid); | |
1187 | } | |
1188 | ||
1189 | /* Last ccw is a nop and doesn't need clear_normalized_cda */ | |
1190 | for (; ccw->flags & CCW_FLAG_CC; ccw++) | |
1191 | if (ccw->cmd_code == READ_FORWARD) | |
1192 | clear_normalized_cda(ccw); | |
1193 | tape_free_request(request); | |
1194 | } | |
1195 | ||
1196 | /* | |
1197 | * check_locate is called just before the tape request is passed to | |
1198 | * the common io layer for execution. It has to check the current | |
1199 | * tape position and insert a locate ccw if it doesn't match the | |
1200 | * start block for the request. | |
1201 | */ | |
1202 | static void | |
1203 | tape_34xx_check_locate(struct tape_device *device, struct tape_request *request) | |
1204 | { | |
1205 | struct tape_34xx_block_id * start_block; | |
1206 | ||
1207 | start_block = (struct tape_34xx_block_id *) request->cpdata; | |
1208 | if (start_block->block == device->blk_data.block_position) | |
1209 | return; | |
1210 | ||
1211 | DBF_LH(4, "Block seek(%06d+%06d)\n", start_block->block, device->bof); | |
1212 | start_block->wrap = 0; | |
1213 | start_block->segment = 1; | |
1214 | start_block->format = (*device->modeset_byte & 0x08) ? | |
1215 | TAPE34XX_FMT_3480_XF : | |
1216 | TAPE34XX_FMT_3480; | |
1217 | start_block->block = start_block->block + device->bof; | |
1218 | tape_34xx_merge_sbid(device, start_block); | |
1219 | tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata); | |
1220 | tape_ccw_cc(request->cpaddr + 2, READ_BLOCK_ID, 8, request->cpdata); | |
1221 | } | |
1222 | #endif | |
1223 | ||
1224 | /* | |
1225 | * List of 3480/3490 magnetic tape commands. | |
1226 | */ | |
1227 | static tape_mtop_fn tape_34xx_mtop[TAPE_NR_MTOPS] = { | |
1228 | [MTRESET] = tape_std_mtreset, | |
1229 | [MTFSF] = tape_std_mtfsf, | |
1230 | [MTBSF] = tape_std_mtbsf, | |
1231 | [MTFSR] = tape_std_mtfsr, | |
1232 | [MTBSR] = tape_std_mtbsr, | |
1233 | [MTWEOF] = tape_std_mtweof, | |
1234 | [MTREW] = tape_std_mtrew, | |
1235 | [MTOFFL] = tape_std_mtoffl, | |
1236 | [MTNOP] = tape_std_mtnop, | |
1237 | [MTRETEN] = tape_std_mtreten, | |
1238 | [MTBSFM] = tape_std_mtbsfm, | |
1239 | [MTFSFM] = tape_std_mtfsfm, | |
1240 | [MTEOM] = tape_std_mteom, | |
1241 | [MTERASE] = tape_std_mterase, | |
1242 | [MTRAS1] = NULL, | |
1243 | [MTRAS2] = NULL, | |
1244 | [MTRAS3] = NULL, | |
1245 | [MTSETBLK] = tape_std_mtsetblk, | |
1246 | [MTSETDENSITY] = NULL, | |
1247 | [MTSEEK] = tape_34xx_mtseek, | |
1248 | [MTTELL] = tape_34xx_mttell, | |
1249 | [MTSETDRVBUFFER] = NULL, | |
1250 | [MTFSS] = NULL, | |
1251 | [MTBSS] = NULL, | |
1252 | [MTWSM] = NULL, | |
1253 | [MTLOCK] = NULL, | |
1254 | [MTUNLOCK] = NULL, | |
1255 | [MTLOAD] = tape_std_mtload, | |
1256 | [MTUNLOAD] = tape_std_mtunload, | |
1257 | [MTCOMPRESSION] = tape_std_mtcompression, | |
1258 | [MTSETPART] = NULL, | |
1259 | [MTMKPART] = NULL | |
1260 | }; | |
1261 | ||
1262 | /* | |
1263 | * Tape discipline structure for 3480 and 3490. | |
1264 | */ | |
1265 | static struct tape_discipline tape_discipline_34xx = { | |
1266 | .owner = THIS_MODULE, | |
1267 | .setup_device = tape_34xx_setup_device, | |
1268 | .cleanup_device = tape_34xx_cleanup_device, | |
1269 | .process_eov = tape_std_process_eov, | |
1270 | .irq = tape_34xx_irq, | |
1271 | .read_block = tape_std_read_block, | |
1272 | .write_block = tape_std_write_block, | |
1273 | #ifdef CONFIG_S390_TAPE_BLOCK | |
1274 | .bread = tape_34xx_bread, | |
1275 | .free_bread = tape_34xx_free_bread, | |
1276 | .check_locate = tape_34xx_check_locate, | |
1277 | #endif | |
1278 | .ioctl_fn = tape_34xx_ioctl, | |
1279 | .mtop_array = tape_34xx_mtop | |
1280 | }; | |
1281 | ||
1282 | static struct ccw_device_id tape_34xx_ids[] = { | |
d2c993d8 HC |
1283 | { CCW_DEVICE_DEVTYPE(0x3480, 0, 0x3480, 0), .driver_info = tape_3480}, |
1284 | { CCW_DEVICE_DEVTYPE(0x3490, 0, 0x3490, 0), .driver_info = tape_3490}, | |
1285 | { /* end of list */ }, | |
1da177e4 LT |
1286 | }; |
1287 | ||
1288 | static int | |
1289 | tape_34xx_online(struct ccw_device *cdev) | |
1290 | { | |
1291 | return tape_generic_online( | |
1292 | cdev->dev.driver_data, | |
1293 | &tape_discipline_34xx | |
1294 | ); | |
1295 | } | |
1296 | ||
1da177e4 LT |
1297 | static struct ccw_driver tape_34xx_driver = { |
1298 | .name = "tape_34xx", | |
1299 | .owner = THIS_MODULE, | |
1300 | .ids = tape_34xx_ids, | |
1301 | .probe = tape_generic_probe, | |
1302 | .remove = tape_generic_remove, | |
1303 | .set_online = tape_34xx_online, | |
4d7a3cdf | 1304 | .set_offline = tape_generic_offline, |
1da177e4 LT |
1305 | }; |
1306 | ||
1307 | static int | |
1308 | tape_34xx_init (void) | |
1309 | { | |
1310 | int rc; | |
1311 | ||
66a464db | 1312 | TAPE_DBF_AREA = debug_register ( "tape_34xx", 2, 2, 4*sizeof(long)); |
1da177e4 LT |
1313 | debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view); |
1314 | #ifdef DBF_LIKE_HELL | |
1315 | debug_set_level(TAPE_DBF_AREA, 6); | |
1316 | #endif | |
1317 | ||
e018ba1f | 1318 | DBF_EVENT(3, "34xx init\n"); |
1da177e4 LT |
1319 | /* Register driver for 3480/3490 tapes. */ |
1320 | rc = ccw_driver_register(&tape_34xx_driver); | |
1321 | if (rc) | |
1322 | DBF_EVENT(3, "34xx init failed\n"); | |
1323 | else | |
1324 | DBF_EVENT(3, "34xx registered\n"); | |
1325 | return rc; | |
1326 | } | |
1327 | ||
1328 | static void | |
1329 | tape_34xx_exit(void) | |
1330 | { | |
1331 | ccw_driver_unregister(&tape_34xx_driver); | |
1332 | ||
1333 | debug_unregister(TAPE_DBF_AREA); | |
1334 | } | |
1335 | ||
1336 | MODULE_DEVICE_TABLE(ccw, tape_34xx_ids); | |
1337 | MODULE_AUTHOR("(C) 2001-2002 IBM Deutschland Entwicklung GmbH"); | |
e018ba1f | 1338 | MODULE_DESCRIPTION("Linux on zSeries channel attached 3480 tape device driver"); |
1da177e4 LT |
1339 | MODULE_LICENSE("GPL"); |
1340 | ||
1341 | module_init(tape_34xx_init); | |
1342 | module_exit(tape_34xx_exit); |