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1 | /* | |
2 | * LSI/Engenio/NetApp E-Series RDAC SCSI Device 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_eh.h> | |
24 | #include <scsi/scsi_dh.h> | |
25 | #include <linux/workqueue.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/module.h> | |
28 | ||
29 | #define RDAC_NAME "rdac" | |
30 | #define RDAC_RETRY_COUNT 5 | |
31 | ||
32 | /* | |
33 | * LSI mode page stuff | |
34 | * | |
35 | * These struct definitions and the forming of the | |
36 | * mode page were taken from the LSI RDAC 2.4 GPL'd | |
37 | * driver, and then converted to Linux conventions. | |
38 | */ | |
39 | #define RDAC_QUIESCENCE_TIME 20 | |
40 | /* | |
41 | * Page Codes | |
42 | */ | |
43 | #define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c | |
44 | ||
45 | /* | |
46 | * Controller modes definitions | |
47 | */ | |
48 | #define RDAC_MODE_TRANSFER_SPECIFIED_LUNS 0x02 | |
49 | ||
50 | /* | |
51 | * RDAC Options field | |
52 | */ | |
53 | #define RDAC_FORCED_QUIESENCE 0x02 | |
54 | ||
55 | #define RDAC_TIMEOUT (60 * HZ) | |
56 | #define RDAC_RETRIES 3 | |
57 | ||
58 | struct rdac_mode_6_hdr { | |
59 | u8 data_len; | |
60 | u8 medium_type; | |
61 | u8 device_params; | |
62 | u8 block_desc_len; | |
63 | }; | |
64 | ||
65 | struct rdac_mode_10_hdr { | |
66 | u16 data_len; | |
67 | u8 medium_type; | |
68 | u8 device_params; | |
69 | u16 reserved; | |
70 | u16 block_desc_len; | |
71 | }; | |
72 | ||
73 | struct rdac_mode_common { | |
74 | u8 controller_serial[16]; | |
75 | u8 alt_controller_serial[16]; | |
76 | u8 rdac_mode[2]; | |
77 | u8 alt_rdac_mode[2]; | |
78 | u8 quiescence_timeout; | |
79 | u8 rdac_options; | |
80 | }; | |
81 | ||
82 | struct rdac_pg_legacy { | |
83 | struct rdac_mode_6_hdr hdr; | |
84 | u8 page_code; | |
85 | u8 page_len; | |
86 | struct rdac_mode_common common; | |
87 | #define MODE6_MAX_LUN 32 | |
88 | u8 lun_table[MODE6_MAX_LUN]; | |
89 | u8 reserved2[32]; | |
90 | u8 reserved3; | |
91 | u8 reserved4; | |
92 | }; | |
93 | ||
94 | struct rdac_pg_expanded { | |
95 | struct rdac_mode_10_hdr hdr; | |
96 | u8 page_code; | |
97 | u8 subpage_code; | |
98 | u8 page_len[2]; | |
99 | struct rdac_mode_common common; | |
100 | u8 lun_table[256]; | |
101 | u8 reserved3; | |
102 | u8 reserved4; | |
103 | }; | |
104 | ||
105 | struct c9_inquiry { | |
106 | u8 peripheral_info; | |
107 | u8 page_code; /* 0xC9 */ | |
108 | u8 reserved1; | |
109 | u8 page_len; | |
110 | u8 page_id[4]; /* "vace" */ | |
111 | u8 avte_cvp; | |
112 | u8 path_prio; | |
113 | u8 reserved2[38]; | |
114 | }; | |
115 | ||
116 | #define SUBSYS_ID_LEN 16 | |
117 | #define SLOT_ID_LEN 2 | |
118 | #define ARRAY_LABEL_LEN 31 | |
119 | ||
120 | struct c4_inquiry { | |
121 | u8 peripheral_info; | |
122 | u8 page_code; /* 0xC4 */ | |
123 | u8 reserved1; | |
124 | u8 page_len; | |
125 | u8 page_id[4]; /* "subs" */ | |
126 | u8 subsys_id[SUBSYS_ID_LEN]; | |
127 | u8 revision[4]; | |
128 | u8 slot_id[SLOT_ID_LEN]; | |
129 | u8 reserved[2]; | |
130 | }; | |
131 | ||
132 | #define UNIQUE_ID_LEN 16 | |
133 | struct c8_inquiry { | |
134 | u8 peripheral_info; | |
135 | u8 page_code; /* 0xC8 */ | |
136 | u8 reserved1; | |
137 | u8 page_len; | |
138 | u8 page_id[4]; /* "edid" */ | |
139 | u8 reserved2[3]; | |
140 | u8 vol_uniq_id_len; | |
141 | u8 vol_uniq_id[16]; | |
142 | u8 vol_user_label_len; | |
143 | u8 vol_user_label[60]; | |
144 | u8 array_uniq_id_len; | |
145 | u8 array_unique_id[UNIQUE_ID_LEN]; | |
146 | u8 array_user_label_len; | |
147 | u8 array_user_label[60]; | |
148 | u8 lun[8]; | |
149 | }; | |
150 | ||
151 | struct rdac_controller { | |
152 | u8 array_id[UNIQUE_ID_LEN]; | |
153 | int use_ms10; | |
154 | struct kref kref; | |
155 | struct list_head node; /* list of all controllers */ | |
156 | union { | |
157 | struct rdac_pg_legacy legacy; | |
158 | struct rdac_pg_expanded expanded; | |
159 | } mode_select; | |
160 | u8 index; | |
161 | u8 array_name[ARRAY_LABEL_LEN]; | |
162 | struct Scsi_Host *host; | |
163 | spinlock_t ms_lock; | |
164 | int ms_queued; | |
165 | struct work_struct ms_work; | |
166 | struct scsi_device *ms_sdev; | |
167 | struct list_head ms_head; | |
168 | struct list_head dh_list; | |
169 | }; | |
170 | ||
171 | struct c2_inquiry { | |
172 | u8 peripheral_info; | |
173 | u8 page_code; /* 0xC2 */ | |
174 | u8 reserved1; | |
175 | u8 page_len; | |
176 | u8 page_id[4]; /* "swr4" */ | |
177 | u8 sw_version[3]; | |
178 | u8 sw_date[3]; | |
179 | u8 features_enabled; | |
180 | u8 max_lun_supported; | |
181 | u8 partitions[239]; /* Total allocation length should be 0xFF */ | |
182 | }; | |
183 | ||
184 | struct rdac_dh_data { | |
185 | struct list_head node; | |
186 | struct rdac_controller *ctlr; | |
187 | struct scsi_device *sdev; | |
188 | #define UNINITIALIZED_LUN (1 << 8) | |
189 | unsigned lun; | |
190 | ||
191 | #define RDAC_MODE 0 | |
192 | #define RDAC_MODE_AVT 1 | |
193 | #define RDAC_MODE_IOSHIP 2 | |
194 | unsigned char mode; | |
195 | ||
196 | #define RDAC_STATE_ACTIVE 0 | |
197 | #define RDAC_STATE_PASSIVE 1 | |
198 | unsigned char state; | |
199 | ||
200 | #define RDAC_LUN_UNOWNED 0 | |
201 | #define RDAC_LUN_OWNED 1 | |
202 | char lun_state; | |
203 | ||
204 | #define RDAC_PREFERRED 0 | |
205 | #define RDAC_NON_PREFERRED 1 | |
206 | char preferred; | |
207 | ||
208 | union { | |
209 | struct c2_inquiry c2; | |
210 | struct c4_inquiry c4; | |
211 | struct c8_inquiry c8; | |
212 | struct c9_inquiry c9; | |
213 | } inq; | |
214 | }; | |
215 | ||
216 | static const char *mode[] = { | |
217 | "RDAC", | |
218 | "AVT", | |
219 | "IOSHIP", | |
220 | }; | |
221 | static const char *lun_state[] = | |
222 | { | |
223 | "unowned", | |
224 | "owned", | |
225 | }; | |
226 | ||
227 | struct rdac_queue_data { | |
228 | struct list_head entry; | |
229 | struct rdac_dh_data *h; | |
230 | activate_complete callback_fn; | |
231 | void *callback_data; | |
232 | }; | |
233 | ||
234 | static LIST_HEAD(ctlr_list); | |
235 | static DEFINE_SPINLOCK(list_lock); | |
236 | static struct workqueue_struct *kmpath_rdacd; | |
237 | static void send_mode_select(struct work_struct *work); | |
238 | ||
239 | /* | |
240 | * module parameter to enable rdac debug logging. | |
241 | * 2 bits for each type of logging, only two types defined for now | |
242 | * Can be enhanced if required at later point | |
243 | */ | |
244 | static int rdac_logging = 1; | |
245 | module_param(rdac_logging, int, S_IRUGO|S_IWUSR); | |
246 | MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, " | |
247 | "Default is 1 - failover logging enabled, " | |
248 | "set it to 0xF to enable all the logs"); | |
249 | ||
250 | #define RDAC_LOG_FAILOVER 0 | |
251 | #define RDAC_LOG_SENSE 2 | |
252 | ||
253 | #define RDAC_LOG_BITS 2 | |
254 | ||
255 | #define RDAC_LOG_LEVEL(SHIFT) \ | |
256 | ((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1)) | |
257 | ||
258 | #define RDAC_LOG(SHIFT, sdev, f, arg...) \ | |
259 | do { \ | |
260 | if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \ | |
261 | sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \ | |
262 | } while (0); | |
263 | ||
264 | static unsigned int rdac_failover_get(struct rdac_controller *ctlr, | |
265 | struct list_head *list, | |
266 | unsigned char *cdb) | |
267 | { | |
268 | struct scsi_device *sdev = ctlr->ms_sdev; | |
269 | struct rdac_dh_data *h = sdev->handler_data; | |
270 | struct rdac_mode_common *common; | |
271 | unsigned data_size; | |
272 | struct rdac_queue_data *qdata; | |
273 | u8 *lun_table; | |
274 | ||
275 | if (h->ctlr->use_ms10) { | |
276 | struct rdac_pg_expanded *rdac_pg; | |
277 | ||
278 | data_size = sizeof(struct rdac_pg_expanded); | |
279 | rdac_pg = &h->ctlr->mode_select.expanded; | |
280 | memset(rdac_pg, 0, data_size); | |
281 | common = &rdac_pg->common; | |
282 | rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40; | |
283 | rdac_pg->subpage_code = 0x1; | |
284 | rdac_pg->page_len[0] = 0x01; | |
285 | rdac_pg->page_len[1] = 0x28; | |
286 | lun_table = rdac_pg->lun_table; | |
287 | } else { | |
288 | struct rdac_pg_legacy *rdac_pg; | |
289 | ||
290 | data_size = sizeof(struct rdac_pg_legacy); | |
291 | rdac_pg = &h->ctlr->mode_select.legacy; | |
292 | memset(rdac_pg, 0, data_size); | |
293 | common = &rdac_pg->common; | |
294 | rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER; | |
295 | rdac_pg->page_len = 0x68; | |
296 | lun_table = rdac_pg->lun_table; | |
297 | } | |
298 | common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS; | |
299 | common->quiescence_timeout = RDAC_QUIESCENCE_TIME; | |
300 | common->rdac_options = RDAC_FORCED_QUIESENCE; | |
301 | ||
302 | list_for_each_entry(qdata, list, entry) { | |
303 | lun_table[qdata->h->lun] = 0x81; | |
304 | } | |
305 | ||
306 | /* Prepare the command. */ | |
307 | if (h->ctlr->use_ms10) { | |
308 | cdb[0] = MODE_SELECT_10; | |
309 | cdb[7] = data_size >> 8; | |
310 | cdb[8] = data_size & 0xff; | |
311 | } else { | |
312 | cdb[0] = MODE_SELECT; | |
313 | cdb[4] = data_size; | |
314 | } | |
315 | ||
316 | return data_size; | |
317 | } | |
318 | ||
319 | static void release_controller(struct kref *kref) | |
320 | { | |
321 | struct rdac_controller *ctlr; | |
322 | ctlr = container_of(kref, struct rdac_controller, kref); | |
323 | ||
324 | list_del(&ctlr->node); | |
325 | kfree(ctlr); | |
326 | } | |
327 | ||
328 | static struct rdac_controller *get_controller(int index, char *array_name, | |
329 | u8 *array_id, struct scsi_device *sdev) | |
330 | { | |
331 | struct rdac_controller *ctlr, *tmp; | |
332 | ||
333 | list_for_each_entry(tmp, &ctlr_list, node) { | |
334 | if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) && | |
335 | (tmp->index == index) && | |
336 | (tmp->host == sdev->host)) { | |
337 | kref_get(&tmp->kref); | |
338 | return tmp; | |
339 | } | |
340 | } | |
341 | ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC); | |
342 | if (!ctlr) | |
343 | return NULL; | |
344 | ||
345 | /* initialize fields of controller */ | |
346 | memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN); | |
347 | ctlr->index = index; | |
348 | ctlr->host = sdev->host; | |
349 | memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN); | |
350 | ||
351 | kref_init(&ctlr->kref); | |
352 | ctlr->use_ms10 = -1; | |
353 | ctlr->ms_queued = 0; | |
354 | ctlr->ms_sdev = NULL; | |
355 | spin_lock_init(&ctlr->ms_lock); | |
356 | INIT_WORK(&ctlr->ms_work, send_mode_select); | |
357 | INIT_LIST_HEAD(&ctlr->ms_head); | |
358 | list_add(&ctlr->node, &ctlr_list); | |
359 | INIT_LIST_HEAD(&ctlr->dh_list); | |
360 | ||
361 | return ctlr; | |
362 | } | |
363 | ||
364 | static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h, | |
365 | char *array_name, u8 *array_id) | |
366 | { | |
367 | int err = SCSI_DH_IO, i; | |
368 | struct c8_inquiry *inqp = &h->inq.c8; | |
369 | ||
370 | if (!scsi_get_vpd_page(sdev, 0xC8, (unsigned char *)inqp, | |
371 | sizeof(struct c8_inquiry))) { | |
372 | if (inqp->page_code != 0xc8) | |
373 | return SCSI_DH_NOSYS; | |
374 | if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' || | |
375 | inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd') | |
376 | return SCSI_DH_NOSYS; | |
377 | h->lun = inqp->lun[7]; /* Uses only the last byte */ | |
378 | ||
379 | for(i=0; i<ARRAY_LABEL_LEN-1; ++i) | |
380 | *(array_name+i) = inqp->array_user_label[(2*i)+1]; | |
381 | ||
382 | *(array_name+ARRAY_LABEL_LEN-1) = '\0'; | |
383 | memset(array_id, 0, UNIQUE_ID_LEN); | |
384 | memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len); | |
385 | err = SCSI_DH_OK; | |
386 | } | |
387 | return err; | |
388 | } | |
389 | ||
390 | static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h) | |
391 | { | |
392 | int err = SCSI_DH_IO, access_state; | |
393 | struct rdac_dh_data *tmp; | |
394 | struct c9_inquiry *inqp = &h->inq.c9; | |
395 | ||
396 | h->state = RDAC_STATE_ACTIVE; | |
397 | if (!scsi_get_vpd_page(sdev, 0xC9, (unsigned char *)inqp, | |
398 | sizeof(struct c9_inquiry))) { | |
399 | /* detect the operating mode */ | |
400 | if ((inqp->avte_cvp >> 5) & 0x1) | |
401 | h->mode = RDAC_MODE_IOSHIP; /* LUN in IOSHIP mode */ | |
402 | else if (inqp->avte_cvp >> 7) | |
403 | h->mode = RDAC_MODE_AVT; /* LUN in AVT mode */ | |
404 | else | |
405 | h->mode = RDAC_MODE; /* LUN in RDAC mode */ | |
406 | ||
407 | /* Update ownership */ | |
408 | if (inqp->avte_cvp & 0x1) { | |
409 | h->lun_state = RDAC_LUN_OWNED; | |
410 | access_state = SCSI_ACCESS_STATE_OPTIMAL; | |
411 | } else { | |
412 | h->lun_state = RDAC_LUN_UNOWNED; | |
413 | if (h->mode == RDAC_MODE) { | |
414 | h->state = RDAC_STATE_PASSIVE; | |
415 | access_state = SCSI_ACCESS_STATE_STANDBY; | |
416 | } else | |
417 | access_state = SCSI_ACCESS_STATE_ACTIVE; | |
418 | } | |
419 | ||
420 | /* Update path prio*/ | |
421 | if (inqp->path_prio & 0x1) { | |
422 | h->preferred = RDAC_PREFERRED; | |
423 | access_state |= SCSI_ACCESS_STATE_PREFERRED; | |
424 | } else | |
425 | h->preferred = RDAC_NON_PREFERRED; | |
426 | rcu_read_lock(); | |
427 | list_for_each_entry_rcu(tmp, &h->ctlr->dh_list, node) { | |
428 | /* h->sdev should always be valid */ | |
429 | BUG_ON(!tmp->sdev); | |
430 | tmp->sdev->access_state = access_state; | |
431 | } | |
432 | rcu_read_unlock(); | |
433 | err = SCSI_DH_OK; | |
434 | } | |
435 | ||
436 | return err; | |
437 | } | |
438 | ||
439 | static int initialize_controller(struct scsi_device *sdev, | |
440 | struct rdac_dh_data *h, char *array_name, u8 *array_id) | |
441 | { | |
442 | int err = SCSI_DH_IO, index; | |
443 | struct c4_inquiry *inqp = &h->inq.c4; | |
444 | ||
445 | if (!scsi_get_vpd_page(sdev, 0xC4, (unsigned char *)inqp, | |
446 | sizeof(struct c4_inquiry))) { | |
447 | /* get the controller index */ | |
448 | if (inqp->slot_id[1] == 0x31) | |
449 | index = 0; | |
450 | else | |
451 | index = 1; | |
452 | ||
453 | spin_lock(&list_lock); | |
454 | h->ctlr = get_controller(index, array_name, array_id, sdev); | |
455 | if (!h->ctlr) | |
456 | err = SCSI_DH_RES_TEMP_UNAVAIL; | |
457 | else { | |
458 | list_add_rcu(&h->node, &h->ctlr->dh_list); | |
459 | h->sdev = sdev; | |
460 | } | |
461 | spin_unlock(&list_lock); | |
462 | err = SCSI_DH_OK; | |
463 | } | |
464 | return err; | |
465 | } | |
466 | ||
467 | static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h) | |
468 | { | |
469 | int err = SCSI_DH_IO; | |
470 | struct c2_inquiry *inqp = &h->inq.c2; | |
471 | ||
472 | if (!scsi_get_vpd_page(sdev, 0xC2, (unsigned char *)inqp, | |
473 | sizeof(struct c2_inquiry))) { | |
474 | /* | |
475 | * If more than MODE6_MAX_LUN luns are supported, use | |
476 | * mode select 10 | |
477 | */ | |
478 | if (inqp->max_lun_supported >= MODE6_MAX_LUN) | |
479 | h->ctlr->use_ms10 = 1; | |
480 | else | |
481 | h->ctlr->use_ms10 = 0; | |
482 | err = SCSI_DH_OK; | |
483 | } | |
484 | return err; | |
485 | } | |
486 | ||
487 | static int mode_select_handle_sense(struct scsi_device *sdev, | |
488 | struct scsi_sense_hdr *sense_hdr) | |
489 | { | |
490 | int err = SCSI_DH_IO; | |
491 | struct rdac_dh_data *h = sdev->handler_data; | |
492 | ||
493 | if (!scsi_sense_valid(sense_hdr)) | |
494 | goto done; | |
495 | ||
496 | switch (sense_hdr->sense_key) { | |
497 | case NO_SENSE: | |
498 | case ABORTED_COMMAND: | |
499 | case UNIT_ATTENTION: | |
500 | err = SCSI_DH_RETRY; | |
501 | break; | |
502 | case NOT_READY: | |
503 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01) | |
504 | /* LUN Not Ready and is in the Process of Becoming | |
505 | * Ready | |
506 | */ | |
507 | err = SCSI_DH_RETRY; | |
508 | break; | |
509 | case ILLEGAL_REQUEST: | |
510 | if (sense_hdr->asc == 0x91 && sense_hdr->ascq == 0x36) | |
511 | /* | |
512 | * Command Lock contention | |
513 | */ | |
514 | err = SCSI_DH_IMM_RETRY; | |
515 | break; | |
516 | default: | |
517 | break; | |
518 | } | |
519 | ||
520 | RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " | |
521 | "MODE_SELECT returned with sense %02x/%02x/%02x", | |
522 | (char *) h->ctlr->array_name, h->ctlr->index, | |
523 | sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq); | |
524 | ||
525 | done: | |
526 | return err; | |
527 | } | |
528 | ||
529 | static void send_mode_select(struct work_struct *work) | |
530 | { | |
531 | struct rdac_controller *ctlr = | |
532 | container_of(work, struct rdac_controller, ms_work); | |
533 | struct scsi_device *sdev = ctlr->ms_sdev; | |
534 | struct rdac_dh_data *h = sdev->handler_data; | |
535 | int err = SCSI_DH_OK, retry_cnt = RDAC_RETRY_COUNT; | |
536 | struct rdac_queue_data *tmp, *qdata; | |
537 | LIST_HEAD(list); | |
538 | unsigned char cdb[COMMAND_SIZE(MODE_SELECT_10)]; | |
539 | struct scsi_sense_hdr sshdr; | |
540 | unsigned int data_size; | |
541 | u64 req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | | |
542 | REQ_FAILFAST_DRIVER; | |
543 | ||
544 | spin_lock(&ctlr->ms_lock); | |
545 | list_splice_init(&ctlr->ms_head, &list); | |
546 | ctlr->ms_queued = 0; | |
547 | ctlr->ms_sdev = NULL; | |
548 | spin_unlock(&ctlr->ms_lock); | |
549 | ||
550 | retry: | |
551 | data_size = rdac_failover_get(ctlr, &list, cdb); | |
552 | ||
553 | RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " | |
554 | "%s MODE_SELECT command", | |
555 | (char *) h->ctlr->array_name, h->ctlr->index, | |
556 | (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying"); | |
557 | ||
558 | if (scsi_execute_req_flags(sdev, cdb, DMA_TO_DEVICE, | |
559 | &h->ctlr->mode_select, data_size, &sshdr, | |
560 | RDAC_TIMEOUT * HZ, | |
561 | RDAC_RETRIES, NULL, req_flags, 0)) { | |
562 | err = mode_select_handle_sense(sdev, &sshdr); | |
563 | if (err == SCSI_DH_RETRY && retry_cnt--) | |
564 | goto retry; | |
565 | if (err == SCSI_DH_IMM_RETRY) | |
566 | goto retry; | |
567 | } | |
568 | if (err == SCSI_DH_OK) { | |
569 | h->state = RDAC_STATE_ACTIVE; | |
570 | RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " | |
571 | "MODE_SELECT completed", | |
572 | (char *) h->ctlr->array_name, h->ctlr->index); | |
573 | } | |
574 | ||
575 | list_for_each_entry_safe(qdata, tmp, &list, entry) { | |
576 | list_del(&qdata->entry); | |
577 | if (err == SCSI_DH_OK) | |
578 | qdata->h->state = RDAC_STATE_ACTIVE; | |
579 | if (qdata->callback_fn) | |
580 | qdata->callback_fn(qdata->callback_data, err); | |
581 | kfree(qdata); | |
582 | } | |
583 | return; | |
584 | } | |
585 | ||
586 | static int queue_mode_select(struct scsi_device *sdev, | |
587 | activate_complete fn, void *data) | |
588 | { | |
589 | struct rdac_queue_data *qdata; | |
590 | struct rdac_controller *ctlr; | |
591 | ||
592 | qdata = kzalloc(sizeof(*qdata), GFP_KERNEL); | |
593 | if (!qdata) | |
594 | return SCSI_DH_RETRY; | |
595 | ||
596 | qdata->h = sdev->handler_data; | |
597 | qdata->callback_fn = fn; | |
598 | qdata->callback_data = data; | |
599 | ||
600 | ctlr = qdata->h->ctlr; | |
601 | spin_lock(&ctlr->ms_lock); | |
602 | list_add_tail(&qdata->entry, &ctlr->ms_head); | |
603 | if (!ctlr->ms_queued) { | |
604 | ctlr->ms_queued = 1; | |
605 | ctlr->ms_sdev = sdev; | |
606 | queue_work(kmpath_rdacd, &ctlr->ms_work); | |
607 | } | |
608 | spin_unlock(&ctlr->ms_lock); | |
609 | return SCSI_DH_OK; | |
610 | } | |
611 | ||
612 | static int rdac_activate(struct scsi_device *sdev, | |
613 | activate_complete fn, void *data) | |
614 | { | |
615 | struct rdac_dh_data *h = sdev->handler_data; | |
616 | int err = SCSI_DH_OK; | |
617 | int act = 0; | |
618 | ||
619 | err = check_ownership(sdev, h); | |
620 | if (err != SCSI_DH_OK) | |
621 | goto done; | |
622 | ||
623 | switch (h->mode) { | |
624 | case RDAC_MODE: | |
625 | if (h->lun_state == RDAC_LUN_UNOWNED) | |
626 | act = 1; | |
627 | break; | |
628 | case RDAC_MODE_IOSHIP: | |
629 | if ((h->lun_state == RDAC_LUN_UNOWNED) && | |
630 | (h->preferred == RDAC_PREFERRED)) | |
631 | act = 1; | |
632 | break; | |
633 | default: | |
634 | break; | |
635 | } | |
636 | ||
637 | if (act) { | |
638 | err = queue_mode_select(sdev, fn, data); | |
639 | if (err == SCSI_DH_OK) | |
640 | return 0; | |
641 | } | |
642 | done: | |
643 | if (fn) | |
644 | fn(data, err); | |
645 | return 0; | |
646 | } | |
647 | ||
648 | static int rdac_prep_fn(struct scsi_device *sdev, struct request *req) | |
649 | { | |
650 | struct rdac_dh_data *h = sdev->handler_data; | |
651 | int ret = BLKPREP_OK; | |
652 | ||
653 | if (h->state != RDAC_STATE_ACTIVE) { | |
654 | ret = BLKPREP_KILL; | |
655 | req->rq_flags |= RQF_QUIET; | |
656 | } | |
657 | return ret; | |
658 | ||
659 | } | |
660 | ||
661 | static int rdac_check_sense(struct scsi_device *sdev, | |
662 | struct scsi_sense_hdr *sense_hdr) | |
663 | { | |
664 | struct rdac_dh_data *h = sdev->handler_data; | |
665 | ||
666 | RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, " | |
667 | "I/O returned with sense %02x/%02x/%02x", | |
668 | (char *) h->ctlr->array_name, h->ctlr->index, | |
669 | sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq); | |
670 | ||
671 | switch (sense_hdr->sense_key) { | |
672 | case NOT_READY: | |
673 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01) | |
674 | /* LUN Not Ready - Logical Unit Not Ready and is in | |
675 | * the process of becoming ready | |
676 | * Just retry. | |
677 | */ | |
678 | return ADD_TO_MLQUEUE; | |
679 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81) | |
680 | /* LUN Not Ready - Storage firmware incompatible | |
681 | * Manual code synchonisation required. | |
682 | * | |
683 | * Nothing we can do here. Try to bypass the path. | |
684 | */ | |
685 | return SUCCESS; | |
686 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1) | |
687 | /* LUN Not Ready - Quiescense in progress | |
688 | * | |
689 | * Just retry and wait. | |
690 | */ | |
691 | return ADD_TO_MLQUEUE; | |
692 | if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02) | |
693 | /* LUN Not Ready - Quiescense in progress | |
694 | * or has been achieved | |
695 | * Just retry. | |
696 | */ | |
697 | return ADD_TO_MLQUEUE; | |
698 | break; | |
699 | case ILLEGAL_REQUEST: | |
700 | if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) { | |
701 | /* Invalid Request - Current Logical Unit Ownership. | |
702 | * Controller is not the current owner of the LUN, | |
703 | * Fail the path, so that the other path be used. | |
704 | */ | |
705 | h->state = RDAC_STATE_PASSIVE; | |
706 | return SUCCESS; | |
707 | } | |
708 | break; | |
709 | case UNIT_ATTENTION: | |
710 | if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00) | |
711 | /* | |
712 | * Power On, Reset, or Bus Device Reset, just retry. | |
713 | */ | |
714 | return ADD_TO_MLQUEUE; | |
715 | if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02) | |
716 | /* | |
717 | * Quiescence in progress , just retry. | |
718 | */ | |
719 | return ADD_TO_MLQUEUE; | |
720 | break; | |
721 | } | |
722 | /* success just means we do not care what scsi-ml does */ | |
723 | return SCSI_RETURN_NOT_HANDLED; | |
724 | } | |
725 | ||
726 | static int rdac_bus_attach(struct scsi_device *sdev) | |
727 | { | |
728 | struct rdac_dh_data *h; | |
729 | int err; | |
730 | char array_name[ARRAY_LABEL_LEN]; | |
731 | char array_id[UNIQUE_ID_LEN]; | |
732 | ||
733 | h = kzalloc(sizeof(*h) , GFP_KERNEL); | |
734 | if (!h) | |
735 | return -ENOMEM; | |
736 | h->lun = UNINITIALIZED_LUN; | |
737 | h->state = RDAC_STATE_ACTIVE; | |
738 | ||
739 | err = get_lun_info(sdev, h, array_name, array_id); | |
740 | if (err != SCSI_DH_OK) | |
741 | goto failed; | |
742 | ||
743 | err = initialize_controller(sdev, h, array_name, array_id); | |
744 | if (err != SCSI_DH_OK) | |
745 | goto failed; | |
746 | ||
747 | err = check_ownership(sdev, h); | |
748 | if (err != SCSI_DH_OK) | |
749 | goto clean_ctlr; | |
750 | ||
751 | err = set_mode_select(sdev, h); | |
752 | if (err != SCSI_DH_OK) | |
753 | goto clean_ctlr; | |
754 | ||
755 | sdev_printk(KERN_NOTICE, sdev, | |
756 | "%s: LUN %d (%s) (%s)\n", | |
757 | RDAC_NAME, h->lun, mode[(int)h->mode], | |
758 | lun_state[(int)h->lun_state]); | |
759 | ||
760 | sdev->handler_data = h; | |
761 | return 0; | |
762 | ||
763 | clean_ctlr: | |
764 | spin_lock(&list_lock); | |
765 | kref_put(&h->ctlr->kref, release_controller); | |
766 | spin_unlock(&list_lock); | |
767 | ||
768 | failed: | |
769 | kfree(h); | |
770 | return -EINVAL; | |
771 | } | |
772 | ||
773 | static void rdac_bus_detach( struct scsi_device *sdev ) | |
774 | { | |
775 | struct rdac_dh_data *h = sdev->handler_data; | |
776 | ||
777 | if (h->ctlr && h->ctlr->ms_queued) | |
778 | flush_workqueue(kmpath_rdacd); | |
779 | ||
780 | spin_lock(&list_lock); | |
781 | if (h->ctlr) { | |
782 | list_del_rcu(&h->node); | |
783 | h->sdev = NULL; | |
784 | kref_put(&h->ctlr->kref, release_controller); | |
785 | } | |
786 | spin_unlock(&list_lock); | |
787 | sdev->handler_data = NULL; | |
788 | kfree(h); | |
789 | } | |
790 | ||
791 | static struct scsi_device_handler rdac_dh = { | |
792 | .name = RDAC_NAME, | |
793 | .module = THIS_MODULE, | |
794 | .prep_fn = rdac_prep_fn, | |
795 | .check_sense = rdac_check_sense, | |
796 | .attach = rdac_bus_attach, | |
797 | .detach = rdac_bus_detach, | |
798 | .activate = rdac_activate, | |
799 | }; | |
800 | ||
801 | static int __init rdac_init(void) | |
802 | { | |
803 | int r; | |
804 | ||
805 | r = scsi_register_device_handler(&rdac_dh); | |
806 | if (r != 0) { | |
807 | printk(KERN_ERR "Failed to register scsi device handler."); | |
808 | goto done; | |
809 | } | |
810 | ||
811 | /* | |
812 | * Create workqueue to handle mode selects for rdac | |
813 | */ | |
814 | kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd"); | |
815 | if (!kmpath_rdacd) { | |
816 | scsi_unregister_device_handler(&rdac_dh); | |
817 | printk(KERN_ERR "kmpath_rdacd creation failed.\n"); | |
818 | ||
819 | r = -EINVAL; | |
820 | } | |
821 | done: | |
822 | return r; | |
823 | } | |
824 | ||
825 | static void __exit rdac_exit(void) | |
826 | { | |
827 | destroy_workqueue(kmpath_rdacd); | |
828 | scsi_unregister_device_handler(&rdac_dh); | |
829 | } | |
830 | ||
831 | module_init(rdac_init); | |
832 | module_exit(rdac_exit); | |
833 | ||
834 | MODULE_DESCRIPTION("Multipath LSI/Engenio/NetApp E-Series RDAC driver"); | |
835 | MODULE_AUTHOR("Mike Christie, Chandra Seetharaman"); | |
836 | MODULE_VERSION("01.00.0000.0000"); | |
837 | MODULE_LICENSE("GPL"); |