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 rdac_mode_common *common; |
269 | unsigned data_size; |
270 | struct rdac_queue_data *qdata; |
271 | u8 *lun_table; |
272 | |
273 | if (ctlr->use_ms10) { |
274 | struct rdac_pg_expanded *rdac_pg; |
275 | |
276 | data_size = sizeof(struct rdac_pg_expanded); |
277 | rdac_pg = &ctlr->mode_select.expanded; |
278 | memset(rdac_pg, 0, data_size); |
279 | common = &rdac_pg->common; |
280 | rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40; |
281 | rdac_pg->subpage_code = 0x1; |
282 | rdac_pg->page_len[0] = 0x01; |
283 | rdac_pg->page_len[1] = 0x28; |
284 | lun_table = rdac_pg->lun_table; |
285 | } else { |
286 | struct rdac_pg_legacy *rdac_pg; |
287 | |
288 | data_size = sizeof(struct rdac_pg_legacy); |
289 | rdac_pg = &ctlr->mode_select.legacy; |
290 | memset(rdac_pg, 0, data_size); |
291 | common = &rdac_pg->common; |
292 | rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER; |
293 | rdac_pg->page_len = 0x68; |
294 | lun_table = rdac_pg->lun_table; |
295 | } |
296 | common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS; |
297 | common->quiescence_timeout = RDAC_QUIESCENCE_TIME; |
298 | common->rdac_options = RDAC_FORCED_QUIESENCE; |
299 | |
300 | list_for_each_entry(qdata, list, entry) { |
301 | lun_table[qdata->h->lun] = 0x81; |
302 | } |
303 | |
304 | /* Prepare the command. */ |
305 | if (ctlr->use_ms10) { |
306 | cdb[0] = MODE_SELECT_10; |
307 | cdb[7] = data_size >> 8; |
308 | cdb[8] = data_size & 0xff; |
309 | } else { |
310 | cdb[0] = MODE_SELECT; |
311 | cdb[4] = data_size; |
312 | } |
313 | |
314 | return data_size; |
315 | } |
316 | |
317 | static void release_controller(struct kref *kref) |
318 | { |
319 | struct rdac_controller *ctlr; |
320 | ctlr = container_of(kref, struct rdac_controller, kref); |
321 | |
322 | list_del(entry: &ctlr->node); |
323 | kfree(objp: ctlr); |
324 | } |
325 | |
326 | static struct rdac_controller *get_controller(int index, char *array_name, |
327 | u8 *array_id, struct scsi_device *sdev) |
328 | { |
329 | struct rdac_controller *ctlr, *tmp; |
330 | |
331 | list_for_each_entry(tmp, &ctlr_list, node) { |
332 | if ((memcmp(p: tmp->array_id, q: array_id, UNIQUE_ID_LEN) == 0) && |
333 | (tmp->index == index) && |
334 | (tmp->host == sdev->host)) { |
335 | kref_get(kref: &tmp->kref); |
336 | return tmp; |
337 | } |
338 | } |
339 | ctlr = kmalloc(size: sizeof(*ctlr), GFP_ATOMIC); |
340 | if (!ctlr) |
341 | return NULL; |
342 | |
343 | /* initialize fields of controller */ |
344 | memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN); |
345 | ctlr->index = index; |
346 | ctlr->host = sdev->host; |
347 | memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN); |
348 | |
349 | kref_init(kref: &ctlr->kref); |
350 | ctlr->use_ms10 = -1; |
351 | ctlr->ms_queued = 0; |
352 | ctlr->ms_sdev = NULL; |
353 | spin_lock_init(&ctlr->ms_lock); |
354 | INIT_WORK(&ctlr->ms_work, send_mode_select); |
355 | INIT_LIST_HEAD(list: &ctlr->ms_head); |
356 | list_add(new: &ctlr->node, head: &ctlr_list); |
357 | INIT_LIST_HEAD(list: &ctlr->dh_list); |
358 | |
359 | return ctlr; |
360 | } |
361 | |
362 | static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h, |
363 | char *array_name, u8 *array_id) |
364 | { |
365 | int err = SCSI_DH_IO, i; |
366 | struct c8_inquiry *inqp = &h->inq.c8; |
367 | |
368 | if (!scsi_get_vpd_page(sdev, page: 0xC8, buf: (unsigned char *)inqp, |
369 | buf_len: sizeof(struct c8_inquiry))) { |
370 | if (inqp->page_code != 0xc8) |
371 | return SCSI_DH_NOSYS; |
372 | if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' || |
373 | inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd') |
374 | return SCSI_DH_NOSYS; |
375 | h->lun = inqp->lun[7]; /* Uses only the last byte */ |
376 | |
377 | for(i=0; i<ARRAY_LABEL_LEN-1; ++i) |
378 | *(array_name+i) = inqp->array_user_label[(2*i)+1]; |
379 | |
380 | *(array_name+ARRAY_LABEL_LEN-1) = '\0'; |
381 | memset(array_id, 0, UNIQUE_ID_LEN); |
382 | memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len); |
383 | err = SCSI_DH_OK; |
384 | } |
385 | return err; |
386 | } |
387 | |
388 | static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h) |
389 | { |
390 | int err = SCSI_DH_IO, access_state; |
391 | struct rdac_dh_data *tmp; |
392 | struct c9_inquiry *inqp = &h->inq.c9; |
393 | |
394 | h->state = RDAC_STATE_ACTIVE; |
395 | if (!scsi_get_vpd_page(sdev, page: 0xC9, buf: (unsigned char *)inqp, |
396 | buf_len: sizeof(struct c9_inquiry))) { |
397 | /* detect the operating mode */ |
398 | if ((inqp->avte_cvp >> 5) & 0x1) |
399 | h->mode = RDAC_MODE_IOSHIP; /* LUN in IOSHIP mode */ |
400 | else if (inqp->avte_cvp >> 7) |
401 | h->mode = RDAC_MODE_AVT; /* LUN in AVT mode */ |
402 | else |
403 | h->mode = RDAC_MODE; /* LUN in RDAC mode */ |
404 | |
405 | /* Update ownership */ |
406 | if (inqp->avte_cvp & 0x1) { |
407 | h->lun_state = RDAC_LUN_OWNED; |
408 | access_state = SCSI_ACCESS_STATE_OPTIMAL; |
409 | } else { |
410 | h->lun_state = RDAC_LUN_UNOWNED; |
411 | if (h->mode == RDAC_MODE) { |
412 | h->state = RDAC_STATE_PASSIVE; |
413 | access_state = SCSI_ACCESS_STATE_STANDBY; |
414 | } else |
415 | access_state = SCSI_ACCESS_STATE_ACTIVE; |
416 | } |
417 | |
418 | /* Update path prio*/ |
419 | if (inqp->path_prio & 0x1) { |
420 | h->preferred = RDAC_PREFERRED; |
421 | access_state |= SCSI_ACCESS_STATE_PREFERRED; |
422 | } else |
423 | h->preferred = RDAC_NON_PREFERRED; |
424 | rcu_read_lock(); |
425 | list_for_each_entry_rcu(tmp, &h->ctlr->dh_list, node) { |
426 | /* h->sdev should always be valid */ |
427 | BUG_ON(!tmp->sdev); |
428 | tmp->sdev->access_state = access_state; |
429 | } |
430 | rcu_read_unlock(); |
431 | err = SCSI_DH_OK; |
432 | } |
433 | |
434 | return err; |
435 | } |
436 | |
437 | static int initialize_controller(struct scsi_device *sdev, |
438 | struct rdac_dh_data *h, char *array_name, u8 *array_id) |
439 | { |
440 | int err = SCSI_DH_IO, index; |
441 | struct c4_inquiry *inqp = &h->inq.c4; |
442 | |
443 | if (!scsi_get_vpd_page(sdev, page: 0xC4, buf: (unsigned char *)inqp, |
444 | buf_len: sizeof(struct c4_inquiry))) { |
445 | /* get the controller index */ |
446 | if (inqp->slot_id[1] == 0x31) |
447 | index = 0; |
448 | else |
449 | index = 1; |
450 | |
451 | spin_lock(lock: &list_lock); |
452 | h->ctlr = get_controller(index, array_name, array_id, sdev); |
453 | if (!h->ctlr) |
454 | err = SCSI_DH_RES_TEMP_UNAVAIL; |
455 | else { |
456 | h->sdev = sdev; |
457 | list_add_rcu(new: &h->node, head: &h->ctlr->dh_list); |
458 | } |
459 | spin_unlock(lock: &list_lock); |
460 | err = SCSI_DH_OK; |
461 | } |
462 | return err; |
463 | } |
464 | |
465 | static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h) |
466 | { |
467 | int err = SCSI_DH_IO; |
468 | struct c2_inquiry *inqp = &h->inq.c2; |
469 | |
470 | if (!scsi_get_vpd_page(sdev, page: 0xC2, buf: (unsigned char *)inqp, |
471 | buf_len: sizeof(struct c2_inquiry))) { |
472 | /* |
473 | * If more than MODE6_MAX_LUN luns are supported, use |
474 | * mode select 10 |
475 | */ |
476 | if (inqp->max_lun_supported >= MODE6_MAX_LUN) |
477 | h->ctlr->use_ms10 = 1; |
478 | else |
479 | h->ctlr->use_ms10 = 0; |
480 | err = SCSI_DH_OK; |
481 | } |
482 | return err; |
483 | } |
484 | |
485 | static int mode_select_handle_sense(struct scsi_device *sdev, |
486 | struct scsi_sense_hdr *sense_hdr) |
487 | { |
488 | int err = SCSI_DH_IO; |
489 | struct rdac_dh_data *h = sdev->handler_data; |
490 | |
491 | if (!scsi_sense_valid(sshdr: sense_hdr)) |
492 | goto done; |
493 | |
494 | switch (sense_hdr->sense_key) { |
495 | case NO_SENSE: |
496 | case ABORTED_COMMAND: |
497 | case UNIT_ATTENTION: |
498 | err = SCSI_DH_RETRY; |
499 | break; |
500 | case NOT_READY: |
501 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01) |
502 | /* LUN Not Ready and is in the Process of Becoming |
503 | * Ready |
504 | */ |
505 | err = SCSI_DH_RETRY; |
506 | break; |
507 | case ILLEGAL_REQUEST: |
508 | if (sense_hdr->asc == 0x91 && sense_hdr->ascq == 0x36) |
509 | /* |
510 | * Command Lock contention |
511 | */ |
512 | err = SCSI_DH_IMM_RETRY; |
513 | break; |
514 | default: |
515 | break; |
516 | } |
517 | |
518 | RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " |
519 | "MODE_SELECT returned with sense %02x/%02x/%02x" , |
520 | (char *) h->ctlr->array_name, h->ctlr->index, |
521 | sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq); |
522 | |
523 | done: |
524 | return err; |
525 | } |
526 | |
527 | static void send_mode_select(struct work_struct *work) |
528 | { |
529 | struct rdac_controller *ctlr = |
530 | container_of(work, struct rdac_controller, ms_work); |
531 | struct scsi_device *sdev = ctlr->ms_sdev; |
532 | struct rdac_dh_data *h = sdev->handler_data; |
533 | int rc, err, retry_cnt = RDAC_RETRY_COUNT; |
534 | struct rdac_queue_data *tmp, *qdata; |
535 | LIST_HEAD(list); |
536 | unsigned char cdb[MAX_COMMAND_SIZE]; |
537 | struct scsi_sense_hdr sshdr; |
538 | unsigned int data_size; |
539 | blk_opf_t opf = REQ_OP_DRV_OUT | REQ_FAILFAST_DEV | |
540 | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER; |
541 | const struct scsi_exec_args exec_args = { |
542 | .sshdr = &sshdr, |
543 | }; |
544 | |
545 | spin_lock(lock: &ctlr->ms_lock); |
546 | list_splice_init(list: &ctlr->ms_head, head: &list); |
547 | ctlr->ms_queued = 0; |
548 | ctlr->ms_sdev = NULL; |
549 | spin_unlock(lock: &ctlr->ms_lock); |
550 | |
551 | retry: |
552 | memset(cdb, 0, sizeof(cdb)); |
553 | |
554 | data_size = rdac_failover_get(ctlr, list: &list, cdb); |
555 | |
556 | RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " |
557 | "%s MODE_SELECT command" , |
558 | (char *) h->ctlr->array_name, h->ctlr->index, |
559 | (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying" ); |
560 | |
561 | rc = scsi_execute_cmd(sdev, cmd: cdb, opf, buffer: &h->ctlr->mode_select, bufflen: data_size, |
562 | RDAC_TIMEOUT * HZ, RDAC_RETRIES, args: &exec_args); |
563 | if (!rc) { |
564 | h->state = RDAC_STATE_ACTIVE; |
565 | RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " |
566 | "MODE_SELECT completed" , |
567 | (char *) h->ctlr->array_name, h->ctlr->index); |
568 | err = SCSI_DH_OK; |
569 | } else if (rc < 0) { |
570 | err = SCSI_DH_IO; |
571 | } else { |
572 | err = mode_select_handle_sense(sdev, sense_hdr: &sshdr); |
573 | if (err == SCSI_DH_RETRY && retry_cnt--) |
574 | goto retry; |
575 | if (err == SCSI_DH_IMM_RETRY) |
576 | goto retry; |
577 | } |
578 | |
579 | list_for_each_entry_safe(qdata, tmp, &list, entry) { |
580 | list_del(entry: &qdata->entry); |
581 | if (err == SCSI_DH_OK) |
582 | qdata->h->state = RDAC_STATE_ACTIVE; |
583 | if (qdata->callback_fn) |
584 | qdata->callback_fn(qdata->callback_data, err); |
585 | kfree(objp: qdata); |
586 | } |
587 | return; |
588 | } |
589 | |
590 | static int queue_mode_select(struct scsi_device *sdev, |
591 | activate_complete fn, void *data) |
592 | { |
593 | struct rdac_queue_data *qdata; |
594 | struct rdac_controller *ctlr; |
595 | |
596 | qdata = kzalloc(size: sizeof(*qdata), GFP_KERNEL); |
597 | if (!qdata) |
598 | return SCSI_DH_RETRY; |
599 | |
600 | qdata->h = sdev->handler_data; |
601 | qdata->callback_fn = fn; |
602 | qdata->callback_data = data; |
603 | |
604 | ctlr = qdata->h->ctlr; |
605 | spin_lock(lock: &ctlr->ms_lock); |
606 | list_add_tail(new: &qdata->entry, head: &ctlr->ms_head); |
607 | if (!ctlr->ms_queued) { |
608 | ctlr->ms_queued = 1; |
609 | ctlr->ms_sdev = sdev; |
610 | queue_work(wq: kmpath_rdacd, work: &ctlr->ms_work); |
611 | } |
612 | spin_unlock(lock: &ctlr->ms_lock); |
613 | return SCSI_DH_OK; |
614 | } |
615 | |
616 | static int rdac_activate(struct scsi_device *sdev, |
617 | activate_complete fn, void *data) |
618 | { |
619 | struct rdac_dh_data *h = sdev->handler_data; |
620 | int err = SCSI_DH_OK; |
621 | int act = 0; |
622 | |
623 | err = check_ownership(sdev, h); |
624 | if (err != SCSI_DH_OK) |
625 | goto done; |
626 | |
627 | switch (h->mode) { |
628 | case RDAC_MODE: |
629 | if (h->lun_state == RDAC_LUN_UNOWNED) |
630 | act = 1; |
631 | break; |
632 | case RDAC_MODE_IOSHIP: |
633 | if ((h->lun_state == RDAC_LUN_UNOWNED) && |
634 | (h->preferred == RDAC_PREFERRED)) |
635 | act = 1; |
636 | break; |
637 | default: |
638 | break; |
639 | } |
640 | |
641 | if (act) { |
642 | err = queue_mode_select(sdev, fn, data); |
643 | if (err == SCSI_DH_OK) |
644 | return 0; |
645 | } |
646 | done: |
647 | if (fn) |
648 | fn(data, err); |
649 | return 0; |
650 | } |
651 | |
652 | static blk_status_t rdac_prep_fn(struct scsi_device *sdev, struct request *req) |
653 | { |
654 | struct rdac_dh_data *h = sdev->handler_data; |
655 | |
656 | if (h->state != RDAC_STATE_ACTIVE) { |
657 | req->rq_flags |= RQF_QUIET; |
658 | return BLK_STS_IOERR; |
659 | } |
660 | |
661 | return BLK_STS_OK; |
662 | } |
663 | |
664 | static enum scsi_disposition rdac_check_sense(struct scsi_device *sdev, |
665 | struct scsi_sense_hdr *sense_hdr) |
666 | { |
667 | struct rdac_dh_data *h = sdev->handler_data; |
668 | |
669 | RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, " |
670 | "I/O returned with sense %02x/%02x/%02x" , |
671 | (char *) h->ctlr->array_name, h->ctlr->index, |
672 | sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq); |
673 | |
674 | switch (sense_hdr->sense_key) { |
675 | case NOT_READY: |
676 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01) |
677 | /* LUN Not Ready - Logical Unit Not Ready and is in |
678 | * the process of becoming ready |
679 | * Just retry. |
680 | */ |
681 | return ADD_TO_MLQUEUE; |
682 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81) |
683 | /* LUN Not Ready - Storage firmware incompatible |
684 | * Manual code synchonisation required. |
685 | * |
686 | * Nothing we can do here. Try to bypass the path. |
687 | */ |
688 | return SUCCESS; |
689 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1) |
690 | /* LUN Not Ready - Quiescense in progress |
691 | * |
692 | * Just retry and wait. |
693 | */ |
694 | return ADD_TO_MLQUEUE; |
695 | if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02) |
696 | /* LUN Not Ready - Quiescense in progress |
697 | * or has been achieved |
698 | * Just retry. |
699 | */ |
700 | return ADD_TO_MLQUEUE; |
701 | break; |
702 | case ILLEGAL_REQUEST: |
703 | if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) { |
704 | /* Invalid Request - Current Logical Unit Ownership. |
705 | * Controller is not the current owner of the LUN, |
706 | * Fail the path, so that the other path be used. |
707 | */ |
708 | h->state = RDAC_STATE_PASSIVE; |
709 | return SUCCESS; |
710 | } |
711 | break; |
712 | case UNIT_ATTENTION: |
713 | if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00) |
714 | /* |
715 | * Power On, Reset, or Bus Device Reset, just retry. |
716 | */ |
717 | return ADD_TO_MLQUEUE; |
718 | if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02) |
719 | /* |
720 | * Quiescence in progress , just retry. |
721 | */ |
722 | return ADD_TO_MLQUEUE; |
723 | break; |
724 | } |
725 | /* success just means we do not care what scsi-ml does */ |
726 | return SCSI_RETURN_NOT_HANDLED; |
727 | } |
728 | |
729 | static int rdac_bus_attach(struct scsi_device *sdev) |
730 | { |
731 | struct rdac_dh_data *h; |
732 | int err; |
733 | char array_name[ARRAY_LABEL_LEN]; |
734 | char array_id[UNIQUE_ID_LEN]; |
735 | |
736 | h = kzalloc(size: sizeof(*h) , GFP_KERNEL); |
737 | if (!h) |
738 | return SCSI_DH_NOMEM; |
739 | h->lun = UNINITIALIZED_LUN; |
740 | h->state = RDAC_STATE_ACTIVE; |
741 | |
742 | err = get_lun_info(sdev, h, array_name, array_id); |
743 | if (err != SCSI_DH_OK) |
744 | goto failed; |
745 | |
746 | err = initialize_controller(sdev, h, array_name, array_id); |
747 | if (err != SCSI_DH_OK) |
748 | goto failed; |
749 | |
750 | err = check_ownership(sdev, h); |
751 | if (err != SCSI_DH_OK) |
752 | goto clean_ctlr; |
753 | |
754 | err = set_mode_select(sdev, h); |
755 | if (err != SCSI_DH_OK) |
756 | goto clean_ctlr; |
757 | |
758 | sdev_printk(KERN_NOTICE, sdev, |
759 | "%s: LUN %d (%s) (%s)\n" , |
760 | RDAC_NAME, h->lun, mode[(int)h->mode], |
761 | lun_state[(int)h->lun_state]); |
762 | |
763 | sdev->handler_data = h; |
764 | return SCSI_DH_OK; |
765 | |
766 | clean_ctlr: |
767 | spin_lock(lock: &list_lock); |
768 | kref_put(kref: &h->ctlr->kref, release: release_controller); |
769 | spin_unlock(lock: &list_lock); |
770 | |
771 | failed: |
772 | kfree(objp: h); |
773 | return err; |
774 | } |
775 | |
776 | static void rdac_bus_detach( struct scsi_device *sdev ) |
777 | { |
778 | struct rdac_dh_data *h = sdev->handler_data; |
779 | |
780 | if (h->ctlr && h->ctlr->ms_queued) |
781 | flush_workqueue(kmpath_rdacd); |
782 | |
783 | spin_lock(lock: &list_lock); |
784 | if (h->ctlr) { |
785 | list_del_rcu(entry: &h->node); |
786 | kref_put(kref: &h->ctlr->kref, release: release_controller); |
787 | } |
788 | spin_unlock(lock: &list_lock); |
789 | sdev->handler_data = NULL; |
790 | synchronize_rcu(); |
791 | kfree(objp: h); |
792 | } |
793 | |
794 | static struct scsi_device_handler rdac_dh = { |
795 | .name = RDAC_NAME, |
796 | .module = THIS_MODULE, |
797 | .prep_fn = rdac_prep_fn, |
798 | .check_sense = rdac_check_sense, |
799 | .attach = rdac_bus_attach, |
800 | .detach = rdac_bus_detach, |
801 | .activate = rdac_activate, |
802 | }; |
803 | |
804 | static int __init rdac_init(void) |
805 | { |
806 | int r; |
807 | |
808 | r = scsi_register_device_handler(scsi_dh: &rdac_dh); |
809 | if (r != 0) { |
810 | printk(KERN_ERR "Failed to register scsi device handler." ); |
811 | goto done; |
812 | } |
813 | |
814 | /* |
815 | * Create workqueue to handle mode selects for rdac |
816 | */ |
817 | kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd" ); |
818 | if (!kmpath_rdacd) { |
819 | scsi_unregister_device_handler(scsi_dh: &rdac_dh); |
820 | printk(KERN_ERR "kmpath_rdacd creation failed.\n" ); |
821 | |
822 | r = -EINVAL; |
823 | } |
824 | done: |
825 | return r; |
826 | } |
827 | |
828 | static void __exit rdac_exit(void) |
829 | { |
830 | destroy_workqueue(wq: kmpath_rdacd); |
831 | scsi_unregister_device_handler(scsi_dh: &rdac_dh); |
832 | } |
833 | |
834 | module_init(rdac_init); |
835 | module_exit(rdac_exit); |
836 | |
837 | MODULE_DESCRIPTION("Multipath LSI/Engenio/NetApp E-Series RDAC driver" ); |
838 | MODULE_AUTHOR("Mike Christie, Chandra Seetharaman" ); |
839 | MODULE_VERSION("01.00.0000.0000" ); |
840 | MODULE_LICENSE("GPL" ); |
841 | |