Commit | Line | Data |
---|---|---|
dd172d72 CS |
1 | /* |
2 | * Engenio/LSI RDAC DM HW handler | |
3 | * | |
4 | * Copyright (C) 2005 Mike Christie. All rights reserved. | |
5 | * Copyright (C) Chandra Seetharaman, IBM Corp. 2007 | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
20 | * | |
21 | */ | |
22 | #include <scsi/scsi.h> | |
23 | #include <scsi/scsi_cmnd.h> | |
24 | #include <scsi/scsi_eh.h> | |
25 | ||
26 | #define DM_MSG_PREFIX "multipath rdac" | |
27 | ||
28 | #include "dm.h" | |
29 | #include "dm-hw-handler.h" | |
30 | ||
31 | #define RDAC_DM_HWH_NAME "rdac" | |
32 | #define RDAC_DM_HWH_VER "0.4" | |
33 | ||
34 | /* | |
35 | * LSI mode page stuff | |
36 | * | |
37 | * These struct definitions and the forming of the | |
38 | * mode page were taken from the LSI RDAC 2.4 GPL'd | |
39 | * driver, and then converted to Linux conventions. | |
40 | */ | |
41 | #define RDAC_QUIESCENCE_TIME 20; | |
42 | /* | |
43 | * Page Codes | |
44 | */ | |
45 | #define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c | |
46 | ||
47 | /* | |
48 | * Controller modes definitions | |
49 | */ | |
50 | #define RDAC_MODE_TRANSFER_ALL_LUNS 0x01 | |
51 | #define RDAC_MODE_TRANSFER_SPECIFIED_LUNS 0x02 | |
52 | ||
53 | /* | |
54 | * RDAC Options field | |
55 | */ | |
56 | #define RDAC_FORCED_QUIESENCE 0x02 | |
57 | ||
58 | #define RDAC_FAILOVER_TIMEOUT (60 * HZ) | |
59 | ||
60 | struct rdac_mode_6_hdr { | |
61 | u8 data_len; | |
62 | u8 medium_type; | |
63 | u8 device_params; | |
64 | u8 block_desc_len; | |
65 | }; | |
66 | ||
67 | struct rdac_mode_10_hdr { | |
68 | u16 data_len; | |
69 | u8 medium_type; | |
70 | u8 device_params; | |
71 | u16 reserved; | |
72 | u16 block_desc_len; | |
73 | }; | |
74 | ||
75 | struct rdac_mode_common { | |
76 | u8 controller_serial[16]; | |
77 | u8 alt_controller_serial[16]; | |
78 | u8 rdac_mode[2]; | |
79 | u8 alt_rdac_mode[2]; | |
80 | u8 quiescence_timeout; | |
81 | u8 rdac_options; | |
82 | }; | |
83 | ||
84 | struct rdac_pg_legacy { | |
85 | struct rdac_mode_6_hdr hdr; | |
86 | u8 page_code; | |
87 | u8 page_len; | |
88 | struct rdac_mode_common common; | |
89 | #define MODE6_MAX_LUN 32 | |
90 | u8 lun_table[MODE6_MAX_LUN]; | |
91 | u8 reserved2[32]; | |
92 | u8 reserved3; | |
93 | u8 reserved4; | |
94 | }; | |
95 | ||
96 | struct rdac_pg_expanded { | |
97 | struct rdac_mode_10_hdr hdr; | |
98 | u8 page_code; | |
99 | u8 subpage_code; | |
100 | u8 page_len[2]; | |
101 | struct rdac_mode_common common; | |
102 | u8 lun_table[256]; | |
103 | u8 reserved3; | |
104 | u8 reserved4; | |
105 | }; | |
106 | ||
107 | struct c9_inquiry { | |
108 | u8 peripheral_info; | |
109 | u8 page_code; /* 0xC9 */ | |
110 | u8 reserved1; | |
111 | u8 page_len; | |
112 | u8 page_id[4]; /* "vace" */ | |
113 | u8 avte_cvp; | |
114 | u8 path_prio; | |
115 | u8 reserved2[38]; | |
116 | }; | |
117 | ||
118 | #define SUBSYS_ID_LEN 16 | |
119 | #define SLOT_ID_LEN 2 | |
120 | ||
121 | struct c4_inquiry { | |
122 | u8 peripheral_info; | |
123 | u8 page_code; /* 0xC4 */ | |
124 | u8 reserved1; | |
125 | u8 page_len; | |
126 | u8 page_id[4]; /* "subs" */ | |
127 | u8 subsys_id[SUBSYS_ID_LEN]; | |
128 | u8 revision[4]; | |
129 | u8 slot_id[SLOT_ID_LEN]; | |
130 | u8 reserved[2]; | |
131 | }; | |
132 | ||
133 | struct rdac_controller { | |
134 | u8 subsys_id[SUBSYS_ID_LEN]; | |
135 | u8 slot_id[SLOT_ID_LEN]; | |
136 | int use_10_ms; | |
137 | struct kref kref; | |
138 | struct list_head node; /* list of all controllers */ | |
139 | spinlock_t lock; | |
140 | int submitted; | |
141 | struct list_head cmd_list; /* list of commands to be submitted */ | |
142 | union { | |
143 | struct rdac_pg_legacy legacy; | |
144 | struct rdac_pg_expanded expanded; | |
145 | } mode_select; | |
146 | }; | |
147 | struct c8_inquiry { | |
148 | u8 peripheral_info; | |
149 | u8 page_code; /* 0xC8 */ | |
150 | u8 reserved1; | |
151 | u8 page_len; | |
152 | u8 page_id[4]; /* "edid" */ | |
153 | u8 reserved2[3]; | |
154 | u8 vol_uniq_id_len; | |
155 | u8 vol_uniq_id[16]; | |
156 | u8 vol_user_label_len; | |
157 | u8 vol_user_label[60]; | |
158 | u8 array_uniq_id_len; | |
159 | u8 array_unique_id[16]; | |
160 | u8 array_user_label_len; | |
161 | u8 array_user_label[60]; | |
162 | u8 lun[8]; | |
163 | }; | |
164 | ||
165 | struct c2_inquiry { | |
166 | u8 peripheral_info; | |
167 | u8 page_code; /* 0xC2 */ | |
168 | u8 reserved1; | |
169 | u8 page_len; | |
170 | u8 page_id[4]; /* "swr4" */ | |
171 | u8 sw_version[3]; | |
172 | u8 sw_date[3]; | |
173 | u8 features_enabled; | |
174 | u8 max_lun_supported; | |
175 | u8 partitions[239]; /* Total allocation length should be 0xFF */ | |
176 | }; | |
177 | ||
178 | struct rdac_handler { | |
179 | struct list_head entry; /* list waiting to submit MODE SELECT */ | |
180 | unsigned timeout; | |
181 | struct rdac_controller *ctlr; | |
182 | #define UNINITIALIZED_LUN (1 << 8) | |
183 | unsigned lun; | |
184 | unsigned char sense[SCSI_SENSE_BUFFERSIZE]; | |
185 | struct dm_path *path; | |
186 | struct work_struct work; | |
187 | #define SEND_C2_INQUIRY 1 | |
188 | #define SEND_C4_INQUIRY 2 | |
189 | #define SEND_C8_INQUIRY 3 | |
190 | #define SEND_C9_INQUIRY 4 | |
191 | #define SEND_MODE_SELECT 5 | |
192 | int cmd_to_send; | |
193 | union { | |
194 | struct c2_inquiry c2; | |
195 | struct c4_inquiry c4; | |
196 | struct c8_inquiry c8; | |
197 | struct c9_inquiry c9; | |
198 | } inq; | |
199 | }; | |
200 | ||
201 | static LIST_HEAD(ctlr_list); | |
202 | static DEFINE_SPINLOCK(list_lock); | |
203 | static struct workqueue_struct *rdac_wkqd; | |
204 | ||
205 | static inline int had_failures(struct request *req, int error) | |
206 | { | |
207 | return (error || host_byte(req->errors) != DID_OK || | |
208 | msg_byte(req->errors) != COMMAND_COMPLETE); | |
209 | } | |
210 | ||
211 | static void rdac_resubmit_all(struct rdac_handler *h) | |
212 | { | |
213 | struct rdac_controller *ctlr = h->ctlr; | |
214 | struct rdac_handler *tmp, *h1; | |
215 | ||
216 | spin_lock(&ctlr->lock); | |
217 | list_for_each_entry_safe(h1, tmp, &ctlr->cmd_list, entry) { | |
218 | h1->cmd_to_send = SEND_C9_INQUIRY; | |
219 | queue_work(rdac_wkqd, &h1->work); | |
220 | list_del(&h1->entry); | |
221 | } | |
222 | ctlr->submitted = 0; | |
223 | spin_unlock(&ctlr->lock); | |
224 | } | |
225 | ||
226 | static void mode_select_endio(struct request *req, int error) | |
227 | { | |
228 | struct rdac_handler *h = req->end_io_data; | |
229 | struct scsi_sense_hdr sense_hdr; | |
230 | int sense = 0, fail = 0; | |
231 | ||
232 | if (had_failures(req, error)) { | |
233 | fail = 1; | |
234 | goto failed; | |
235 | } | |
236 | ||
237 | if (status_byte(req->errors) == CHECK_CONDITION) { | |
238 | scsi_normalize_sense(req->sense, SCSI_SENSE_BUFFERSIZE, | |
239 | &sense_hdr); | |
240 | sense = (sense_hdr.sense_key << 16) | (sense_hdr.asc << 8) | | |
241 | sense_hdr.ascq; | |
242 | /* If it is retryable failure, submit the c9 inquiry again */ | |
243 | if (sense == 0x59136 || sense == 0x68b02 || sense == 0xb8b02 || | |
244 | sense == 0x62900) { | |
245 | /* 0x59136 - Command lock contention | |
246 | * 0x[6b]8b02 - Quiesense in progress or achieved | |
247 | * 0x62900 - Power On, Reset, or Bus Device Reset | |
248 | */ | |
249 | h->cmd_to_send = SEND_C9_INQUIRY; | |
250 | queue_work(rdac_wkqd, &h->work); | |
251 | goto done; | |
252 | } | |
253 | if (sense) | |
254 | DMINFO("MODE_SELECT failed on %s with sense 0x%x", | |
255 | h->path->dev->name, sense); | |
256 | } | |
257 | failed: | |
258 | if (fail || sense) | |
259 | dm_pg_init_complete(h->path, MP_FAIL_PATH); | |
260 | else | |
261 | dm_pg_init_complete(h->path, 0); | |
262 | ||
263 | done: | |
264 | rdac_resubmit_all(h); | |
265 | __blk_put_request(req->q, req); | |
266 | } | |
267 | ||
268 | static struct request *get_rdac_req(struct rdac_handler *h, | |
269 | void *buffer, unsigned buflen, int rw) | |
270 | { | |
271 | struct request *rq; | |
272 | struct request_queue *q = bdev_get_queue(h->path->dev->bdev); | |
273 | ||
274 | rq = blk_get_request(q, rw, GFP_KERNEL); | |
275 | ||
276 | if (!rq) { | |
277 | DMINFO("get_rdac_req: blk_get_request failed"); | |
278 | return NULL; | |
279 | } | |
280 | ||
281 | if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_KERNEL)) { | |
282 | blk_put_request(rq); | |
283 | DMINFO("get_rdac_req: blk_rq_map_kern failed"); | |
284 | return NULL; | |
285 | } | |
286 | ||
287 | memset(&rq->cmd, 0, BLK_MAX_CDB); | |
288 | rq->sense = h->sense; | |
289 | memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); | |
290 | rq->sense_len = 0; | |
291 | ||
292 | rq->end_io_data = h; | |
293 | rq->timeout = h->timeout; | |
294 | rq->cmd_type = REQ_TYPE_BLOCK_PC; | |
f99ba18a | 295 | rq->cmd_flags |= REQ_FAILFAST | REQ_NOMERGE; |
dd172d72 CS |
296 | return rq; |
297 | } | |
298 | ||
299 | static struct request *rdac_failover_get(struct rdac_handler *h) | |
300 | { | |
301 | struct request *rq; | |
302 | struct rdac_mode_common *common; | |
303 | unsigned data_size; | |
304 | ||
305 | if (h->ctlr->use_10_ms) { | |
306 | struct rdac_pg_expanded *rdac_pg; | |
307 | ||
308 | data_size = sizeof(struct rdac_pg_expanded); | |
309 | rdac_pg = &h->ctlr->mode_select.expanded; | |
310 | memset(rdac_pg, 0, data_size); | |
311 | common = &rdac_pg->common; | |
312 | rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40; | |
313 | rdac_pg->subpage_code = 0x1; | |
314 | rdac_pg->page_len[0] = 0x01; | |
315 | rdac_pg->page_len[1] = 0x28; | |
316 | rdac_pg->lun_table[h->lun] = 0x81; | |
317 | } else { | |
318 | struct rdac_pg_legacy *rdac_pg; | |
319 | ||
320 | data_size = sizeof(struct rdac_pg_legacy); | |
321 | rdac_pg = &h->ctlr->mode_select.legacy; | |
322 | memset(rdac_pg, 0, data_size); | |
323 | common = &rdac_pg->common; | |
324 | rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER; | |
325 | rdac_pg->page_len = 0x68; | |
326 | rdac_pg->lun_table[h->lun] = 0x81; | |
327 | } | |
328 | common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS; | |
329 | common->quiescence_timeout = RDAC_QUIESCENCE_TIME; | |
330 | common->rdac_options = RDAC_FORCED_QUIESENCE; | |
331 | ||
332 | /* get request for block layer packet command */ | |
333 | rq = get_rdac_req(h, &h->ctlr->mode_select, data_size, WRITE); | |
334 | if (!rq) { | |
335 | DMERR("rdac_failover_get: no rq"); | |
336 | return NULL; | |
337 | } | |
338 | ||
339 | /* Prepare the command. */ | |
340 | if (h->ctlr->use_10_ms) { | |
341 | rq->cmd[0] = MODE_SELECT_10; | |
342 | rq->cmd[7] = data_size >> 8; | |
343 | rq->cmd[8] = data_size & 0xff; | |
344 | } else { | |
345 | rq->cmd[0] = MODE_SELECT; | |
346 | rq->cmd[4] = data_size; | |
347 | } | |
348 | rq->cmd_len = COMMAND_SIZE(rq->cmd[0]); | |
349 | ||
350 | return rq; | |
351 | } | |
352 | ||
353 | /* Acquires h->ctlr->lock */ | |
354 | static void submit_mode_select(struct rdac_handler *h) | |
355 | { | |
356 | struct request *rq; | |
357 | struct request_queue *q = bdev_get_queue(h->path->dev->bdev); | |
358 | ||
359 | spin_lock(&h->ctlr->lock); | |
360 | if (h->ctlr->submitted) { | |
361 | list_add(&h->entry, &h->ctlr->cmd_list); | |
362 | goto drop_lock; | |
363 | } | |
364 | ||
365 | if (!q) { | |
366 | DMINFO("submit_mode_select: no queue"); | |
367 | goto fail_path; | |
368 | } | |
369 | ||
370 | rq = rdac_failover_get(h); | |
371 | if (!rq) { | |
372 | DMERR("submit_mode_select: no rq"); | |
373 | goto fail_path; | |
374 | } | |
375 | ||
376 | DMINFO("queueing MODE_SELECT command on %s", h->path->dev->name); | |
377 | ||
378 | blk_execute_rq_nowait(q, NULL, rq, 1, mode_select_endio); | |
379 | h->ctlr->submitted = 1; | |
380 | goto drop_lock; | |
381 | fail_path: | |
382 | dm_pg_init_complete(h->path, MP_FAIL_PATH); | |
383 | drop_lock: | |
384 | spin_unlock(&h->ctlr->lock); | |
385 | } | |
386 | ||
387 | static void release_ctlr(struct kref *kref) | |
388 | { | |
389 | struct rdac_controller *ctlr; | |
390 | ctlr = container_of(kref, struct rdac_controller, kref); | |
391 | ||
392 | spin_lock(&list_lock); | |
393 | list_del(&ctlr->node); | |
394 | spin_unlock(&list_lock); | |
395 | kfree(ctlr); | |
396 | } | |
397 | ||
398 | static struct rdac_controller *get_controller(u8 *subsys_id, u8 *slot_id) | |
399 | { | |
400 | struct rdac_controller *ctlr, *tmp; | |
401 | ||
402 | spin_lock(&list_lock); | |
403 | ||
404 | list_for_each_entry(tmp, &ctlr_list, node) { | |
405 | if ((memcmp(tmp->subsys_id, subsys_id, SUBSYS_ID_LEN) == 0) && | |
406 | (memcmp(tmp->slot_id, slot_id, SLOT_ID_LEN) == 0)) { | |
407 | kref_get(&tmp->kref); | |
408 | spin_unlock(&list_lock); | |
409 | return tmp; | |
410 | } | |
411 | } | |
412 | ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC); | |
413 | if (!ctlr) | |
414 | goto done; | |
415 | ||
416 | /* initialize fields of controller */ | |
417 | memcpy(ctlr->subsys_id, subsys_id, SUBSYS_ID_LEN); | |
418 | memcpy(ctlr->slot_id, slot_id, SLOT_ID_LEN); | |
419 | kref_init(&ctlr->kref); | |
420 | spin_lock_init(&ctlr->lock); | |
421 | ctlr->submitted = 0; | |
422 | ctlr->use_10_ms = -1; | |
423 | INIT_LIST_HEAD(&ctlr->cmd_list); | |
424 | list_add(&ctlr->node, &ctlr_list); | |
425 | done: | |
426 | spin_unlock(&list_lock); | |
427 | return ctlr; | |
428 | } | |
429 | ||
430 | static void c4_endio(struct request *req, int error) | |
431 | { | |
432 | struct rdac_handler *h = req->end_io_data; | |
433 | struct c4_inquiry *sp; | |
434 | ||
435 | if (had_failures(req, error)) { | |
436 | dm_pg_init_complete(h->path, MP_FAIL_PATH); | |
437 | goto done; | |
438 | } | |
439 | ||
440 | sp = &h->inq.c4; | |
441 | ||
442 | h->ctlr = get_controller(sp->subsys_id, sp->slot_id); | |
443 | ||
444 | if (h->ctlr) { | |
445 | h->cmd_to_send = SEND_C9_INQUIRY; | |
446 | queue_work(rdac_wkqd, &h->work); | |
447 | } else | |
448 | dm_pg_init_complete(h->path, MP_FAIL_PATH); | |
449 | done: | |
450 | __blk_put_request(req->q, req); | |
451 | } | |
452 | ||
453 | static void c2_endio(struct request *req, int error) | |
454 | { | |
455 | struct rdac_handler *h = req->end_io_data; | |
456 | struct c2_inquiry *sp; | |
457 | ||
458 | if (had_failures(req, error)) { | |
459 | dm_pg_init_complete(h->path, MP_FAIL_PATH); | |
460 | goto done; | |
461 | } | |
462 | ||
463 | sp = &h->inq.c2; | |
464 | ||
465 | /* If more than MODE6_MAX_LUN luns are supported, use mode select 10 */ | |
466 | if (sp->max_lun_supported >= MODE6_MAX_LUN) | |
467 | h->ctlr->use_10_ms = 1; | |
468 | else | |
469 | h->ctlr->use_10_ms = 0; | |
470 | ||
471 | h->cmd_to_send = SEND_MODE_SELECT; | |
472 | queue_work(rdac_wkqd, &h->work); | |
473 | done: | |
474 | __blk_put_request(req->q, req); | |
475 | } | |
476 | ||
477 | static void c9_endio(struct request *req, int error) | |
478 | { | |
479 | struct rdac_handler *h = req->end_io_data; | |
480 | struct c9_inquiry *sp; | |
481 | ||
482 | if (had_failures(req, error)) { | |
483 | dm_pg_init_complete(h->path, MP_FAIL_PATH); | |
484 | goto done; | |
485 | } | |
486 | ||
487 | /* We need to look at the sense keys here to take clear action. | |
488 | * For now simple logic: If the host is in AVT mode or if controller | |
489 | * owns the lun, return dm_pg_init_complete(), otherwise submit | |
490 | * MODE SELECT. | |
491 | */ | |
492 | sp = &h->inq.c9; | |
493 | ||
494 | /* If in AVT mode, return success */ | |
495 | if ((sp->avte_cvp >> 7) == 0x1) { | |
496 | dm_pg_init_complete(h->path, 0); | |
497 | goto done; | |
498 | } | |
499 | ||
500 | /* If the controller on this path owns the LUN, return success */ | |
501 | if (sp->avte_cvp & 0x1) { | |
502 | dm_pg_init_complete(h->path, 0); | |
503 | goto done; | |
504 | } | |
505 | ||
506 | if (h->ctlr) { | |
507 | if (h->ctlr->use_10_ms == -1) | |
508 | h->cmd_to_send = SEND_C2_INQUIRY; | |
509 | else | |
510 | h->cmd_to_send = SEND_MODE_SELECT; | |
511 | } else | |
512 | h->cmd_to_send = SEND_C4_INQUIRY; | |
513 | queue_work(rdac_wkqd, &h->work); | |
514 | done: | |
515 | __blk_put_request(req->q, req); | |
516 | } | |
517 | ||
518 | static void c8_endio(struct request *req, int error) | |
519 | { | |
520 | struct rdac_handler *h = req->end_io_data; | |
521 | struct c8_inquiry *sp; | |
522 | ||
523 | if (had_failures(req, error)) { | |
524 | dm_pg_init_complete(h->path, MP_FAIL_PATH); | |
525 | goto done; | |
526 | } | |
527 | ||
528 | /* We need to look at the sense keys here to take clear action. | |
529 | * For now simple logic: Get the lun from the inquiry page. | |
530 | */ | |
531 | sp = &h->inq.c8; | |
532 | h->lun = sp->lun[7]; /* currently it uses only one byte */ | |
533 | h->cmd_to_send = SEND_C9_INQUIRY; | |
534 | queue_work(rdac_wkqd, &h->work); | |
535 | done: | |
536 | __blk_put_request(req->q, req); | |
537 | } | |
538 | ||
539 | static void submit_inquiry(struct rdac_handler *h, int page_code, | |
540 | unsigned int len, rq_end_io_fn endio) | |
541 | { | |
542 | struct request *rq; | |
543 | struct request_queue *q = bdev_get_queue(h->path->dev->bdev); | |
544 | ||
545 | if (!q) | |
546 | goto fail_path; | |
547 | ||
548 | rq = get_rdac_req(h, &h->inq, len, READ); | |
549 | if (!rq) | |
550 | goto fail_path; | |
551 | ||
552 | /* Prepare the command. */ | |
553 | rq->cmd[0] = INQUIRY; | |
554 | rq->cmd[1] = 1; | |
555 | rq->cmd[2] = page_code; | |
556 | rq->cmd[4] = len; | |
557 | rq->cmd_len = COMMAND_SIZE(INQUIRY); | |
558 | blk_execute_rq_nowait(q, NULL, rq, 1, endio); | |
559 | return; | |
560 | ||
561 | fail_path: | |
562 | dm_pg_init_complete(h->path, MP_FAIL_PATH); | |
563 | } | |
564 | ||
565 | static void service_wkq(struct work_struct *work) | |
566 | { | |
567 | struct rdac_handler *h = container_of(work, struct rdac_handler, work); | |
568 | ||
569 | switch (h->cmd_to_send) { | |
570 | case SEND_C2_INQUIRY: | |
571 | submit_inquiry(h, 0xC2, sizeof(struct c2_inquiry), c2_endio); | |
572 | break; | |
573 | case SEND_C4_INQUIRY: | |
574 | submit_inquiry(h, 0xC4, sizeof(struct c4_inquiry), c4_endio); | |
575 | break; | |
576 | case SEND_C8_INQUIRY: | |
577 | submit_inquiry(h, 0xC8, sizeof(struct c8_inquiry), c8_endio); | |
578 | break; | |
579 | case SEND_C9_INQUIRY: | |
580 | submit_inquiry(h, 0xC9, sizeof(struct c9_inquiry), c9_endio); | |
581 | break; | |
582 | case SEND_MODE_SELECT: | |
583 | submit_mode_select(h); | |
584 | break; | |
585 | default: | |
586 | BUG(); | |
587 | } | |
588 | } | |
589 | /* | |
590 | * only support subpage2c until we confirm that this is just a matter of | |
591 | * of updating firmware or not, and RDAC (basic AVT works already) for now | |
592 | * but we can add these in in when we get time and testers | |
593 | */ | |
594 | static int rdac_create(struct hw_handler *hwh, unsigned argc, char **argv) | |
595 | { | |
596 | struct rdac_handler *h; | |
597 | unsigned timeout; | |
598 | ||
599 | if (argc == 0) { | |
600 | /* No arguments: use defaults */ | |
601 | timeout = RDAC_FAILOVER_TIMEOUT; | |
602 | } else if (argc != 1) { | |
603 | DMWARN("incorrect number of arguments"); | |
604 | return -EINVAL; | |
605 | } else { | |
606 | if (sscanf(argv[1], "%u", &timeout) != 1) { | |
607 | DMWARN("invalid timeout value"); | |
608 | return -EINVAL; | |
609 | } | |
610 | } | |
611 | ||
612 | h = kzalloc(sizeof(*h), GFP_KERNEL); | |
613 | if (!h) | |
614 | return -ENOMEM; | |
615 | ||
616 | hwh->context = h; | |
617 | h->timeout = timeout; | |
618 | h->lun = UNINITIALIZED_LUN; | |
619 | INIT_WORK(&h->work, service_wkq); | |
620 | DMWARN("using RDAC command with timeout %u", h->timeout); | |
621 | ||
622 | return 0; | |
623 | } | |
624 | ||
625 | static void rdac_destroy(struct hw_handler *hwh) | |
626 | { | |
627 | struct rdac_handler *h = hwh->context; | |
628 | ||
629 | if (h->ctlr) | |
630 | kref_put(&h->ctlr->kref, release_ctlr); | |
631 | kfree(h); | |
632 | hwh->context = NULL; | |
633 | } | |
634 | ||
635 | static unsigned rdac_error(struct hw_handler *hwh, struct bio *bio) | |
636 | { | |
637 | /* Try default handler */ | |
638 | return dm_scsi_err_handler(hwh, bio); | |
639 | } | |
640 | ||
641 | static void rdac_pg_init(struct hw_handler *hwh, unsigned bypassed, | |
642 | struct dm_path *path) | |
643 | { | |
644 | struct rdac_handler *h = hwh->context; | |
645 | ||
646 | h->path = path; | |
647 | switch (h->lun) { | |
648 | case UNINITIALIZED_LUN: | |
649 | submit_inquiry(h, 0xC8, sizeof(struct c8_inquiry), c8_endio); | |
650 | break; | |
651 | default: | |
652 | submit_inquiry(h, 0xC9, sizeof(struct c9_inquiry), c9_endio); | |
653 | } | |
654 | } | |
655 | ||
656 | static struct hw_handler_type rdac_handler = { | |
657 | .name = RDAC_DM_HWH_NAME, | |
658 | .module = THIS_MODULE, | |
659 | .create = rdac_create, | |
660 | .destroy = rdac_destroy, | |
661 | .pg_init = rdac_pg_init, | |
662 | .error = rdac_error, | |
663 | }; | |
664 | ||
665 | static int __init rdac_init(void) | |
666 | { | |
c7ac86de | 667 | int r; |
dd172d72 CS |
668 | |
669 | rdac_wkqd = create_singlethread_workqueue("rdac_wkqd"); | |
670 | if (!rdac_wkqd) { | |
671 | DMERR("Failed to create workqueue rdac_wkqd."); | |
dd172d72 CS |
672 | return -ENOMEM; |
673 | } | |
674 | ||
c7ac86de BR |
675 | r = dm_register_hw_handler(&rdac_handler); |
676 | if (r < 0) { | |
677 | DMERR("%s: register failed %d", RDAC_DM_HWH_NAME, r); | |
678 | destroy_workqueue(rdac_wkqd); | |
679 | return r; | |
680 | } | |
681 | ||
dd172d72 CS |
682 | DMINFO("%s: version %s loaded", RDAC_DM_HWH_NAME, RDAC_DM_HWH_VER); |
683 | return 0; | |
684 | } | |
685 | ||
686 | static void __exit rdac_exit(void) | |
687 | { | |
688 | int r = dm_unregister_hw_handler(&rdac_handler); | |
689 | ||
690 | destroy_workqueue(rdac_wkqd); | |
691 | if (r < 0) | |
692 | DMERR("%s: unregister failed %d", RDAC_DM_HWH_NAME, r); | |
693 | } | |
694 | ||
695 | module_init(rdac_init); | |
696 | module_exit(rdac_exit); | |
697 | ||
698 | MODULE_DESCRIPTION("DM Multipath LSI/Engenio RDAC support"); | |
699 | MODULE_AUTHOR("Mike Christie, Chandra Seetharaman"); | |
700 | MODULE_LICENSE("GPL"); | |
701 | MODULE_VERSION(RDAC_DM_HWH_VER); |