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fbd7ab3e CS |
1 | /* |
2 | * Engenio/LSI 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> | |
970f3f47 | 25 | #include <linux/workqueue.h> |
5a0e3ad6 | 26 | #include <linux/slab.h> |
fbd7ab3e CS |
27 | |
28 | #define RDAC_NAME "rdac" | |
c85f8cb9 | 29 | #define RDAC_RETRY_COUNT 5 |
fbd7ab3e CS |
30 | |
31 | /* | |
32 | * LSI mode page stuff | |
33 | * | |
34 | * These struct definitions and the forming of the | |
35 | * mode page were taken from the LSI RDAC 2.4 GPL'd | |
36 | * driver, and then converted to Linux conventions. | |
37 | */ | |
38 | #define RDAC_QUIESCENCE_TIME 20; | |
39 | /* | |
40 | * Page Codes | |
41 | */ | |
42 | #define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c | |
43 | ||
44 | /* | |
45 | * Controller modes definitions | |
46 | */ | |
47 | #define RDAC_MODE_TRANSFER_SPECIFIED_LUNS 0x02 | |
48 | ||
49 | /* | |
50 | * RDAC Options field | |
51 | */ | |
52 | #define RDAC_FORCED_QUIESENCE 0x02 | |
53 | ||
54 | #define RDAC_TIMEOUT (60 * HZ) | |
55 | #define RDAC_RETRIES 3 | |
56 | ||
57 | struct rdac_mode_6_hdr { | |
58 | u8 data_len; | |
59 | u8 medium_type; | |
60 | u8 device_params; | |
61 | u8 block_desc_len; | |
62 | }; | |
63 | ||
64 | struct rdac_mode_10_hdr { | |
65 | u16 data_len; | |
66 | u8 medium_type; | |
67 | u8 device_params; | |
68 | u16 reserved; | |
69 | u16 block_desc_len; | |
70 | }; | |
71 | ||
72 | struct rdac_mode_common { | |
73 | u8 controller_serial[16]; | |
74 | u8 alt_controller_serial[16]; | |
75 | u8 rdac_mode[2]; | |
76 | u8 alt_rdac_mode[2]; | |
77 | u8 quiescence_timeout; | |
78 | u8 rdac_options; | |
79 | }; | |
80 | ||
81 | struct rdac_pg_legacy { | |
82 | struct rdac_mode_6_hdr hdr; | |
83 | u8 page_code; | |
84 | u8 page_len; | |
85 | struct rdac_mode_common common; | |
86 | #define MODE6_MAX_LUN 32 | |
87 | u8 lun_table[MODE6_MAX_LUN]; | |
88 | u8 reserved2[32]; | |
89 | u8 reserved3; | |
90 | u8 reserved4; | |
91 | }; | |
92 | ||
93 | struct rdac_pg_expanded { | |
94 | struct rdac_mode_10_hdr hdr; | |
95 | u8 page_code; | |
96 | u8 subpage_code; | |
97 | u8 page_len[2]; | |
98 | struct rdac_mode_common common; | |
99 | u8 lun_table[256]; | |
100 | u8 reserved3; | |
101 | u8 reserved4; | |
102 | }; | |
103 | ||
104 | struct c9_inquiry { | |
105 | u8 peripheral_info; | |
106 | u8 page_code; /* 0xC9 */ | |
107 | u8 reserved1; | |
108 | u8 page_len; | |
109 | u8 page_id[4]; /* "vace" */ | |
110 | u8 avte_cvp; | |
111 | u8 path_prio; | |
112 | u8 reserved2[38]; | |
113 | }; | |
114 | ||
115 | #define SUBSYS_ID_LEN 16 | |
116 | #define SLOT_ID_LEN 2 | |
1527666e | 117 | #define ARRAY_LABEL_LEN 31 |
fbd7ab3e CS |
118 | |
119 | struct c4_inquiry { | |
120 | u8 peripheral_info; | |
121 | u8 page_code; /* 0xC4 */ | |
122 | u8 reserved1; | |
123 | u8 page_len; | |
124 | u8 page_id[4]; /* "subs" */ | |
125 | u8 subsys_id[SUBSYS_ID_LEN]; | |
126 | u8 revision[4]; | |
127 | u8 slot_id[SLOT_ID_LEN]; | |
128 | u8 reserved[2]; | |
129 | }; | |
130 | ||
131 | struct rdac_controller { | |
132 | u8 subsys_id[SUBSYS_ID_LEN]; | |
133 | u8 slot_id[SLOT_ID_LEN]; | |
134 | int use_ms10; | |
135 | struct kref kref; | |
136 | struct list_head node; /* list of all controllers */ | |
137 | union { | |
138 | struct rdac_pg_legacy legacy; | |
139 | struct rdac_pg_expanded expanded; | |
140 | } mode_select; | |
1527666e MB |
141 | u8 index; |
142 | u8 array_name[ARRAY_LABEL_LEN]; | |
970f3f47 CS |
143 | spinlock_t ms_lock; |
144 | int ms_queued; | |
145 | struct work_struct ms_work; | |
146 | struct scsi_device *ms_sdev; | |
147 | struct list_head ms_head; | |
fbd7ab3e | 148 | }; |
970f3f47 | 149 | |
fbd7ab3e CS |
150 | struct c8_inquiry { |
151 | u8 peripheral_info; | |
152 | u8 page_code; /* 0xC8 */ | |
153 | u8 reserved1; | |
154 | u8 page_len; | |
155 | u8 page_id[4]; /* "edid" */ | |
156 | u8 reserved2[3]; | |
157 | u8 vol_uniq_id_len; | |
158 | u8 vol_uniq_id[16]; | |
159 | u8 vol_user_label_len; | |
160 | u8 vol_user_label[60]; | |
161 | u8 array_uniq_id_len; | |
162 | u8 array_unique_id[16]; | |
163 | u8 array_user_label_len; | |
164 | u8 array_user_label[60]; | |
165 | u8 lun[8]; | |
166 | }; | |
167 | ||
168 | struct c2_inquiry { | |
169 | u8 peripheral_info; | |
170 | u8 page_code; /* 0xC2 */ | |
171 | u8 reserved1; | |
172 | u8 page_len; | |
173 | u8 page_id[4]; /* "swr4" */ | |
174 | u8 sw_version[3]; | |
175 | u8 sw_date[3]; | |
176 | u8 features_enabled; | |
177 | u8 max_lun_supported; | |
178 | u8 partitions[239]; /* Total allocation length should be 0xFF */ | |
179 | }; | |
180 | ||
181 | struct rdac_dh_data { | |
182 | struct rdac_controller *ctlr; | |
183 | #define UNINITIALIZED_LUN (1 << 8) | |
184 | unsigned lun; | |
185 | #define RDAC_STATE_ACTIVE 0 | |
186 | #define RDAC_STATE_PASSIVE 1 | |
187 | unsigned char state; | |
ca9f0089 HR |
188 | |
189 | #define RDAC_LUN_UNOWNED 0 | |
190 | #define RDAC_LUN_OWNED 1 | |
191 | #define RDAC_LUN_AVT 2 | |
192 | char lun_state; | |
fbd7ab3e CS |
193 | unsigned char sense[SCSI_SENSE_BUFFERSIZE]; |
194 | union { | |
195 | struct c2_inquiry c2; | |
196 | struct c4_inquiry c4; | |
197 | struct c8_inquiry c8; | |
198 | struct c9_inquiry c9; | |
199 | } inq; | |
200 | }; | |
201 | ||
ca9f0089 HR |
202 | static const char *lun_state[] = |
203 | { | |
204 | "unowned", | |
205 | "owned", | |
206 | "owned (AVT mode)", | |
207 | }; | |
208 | ||
970f3f47 CS |
209 | struct rdac_queue_data { |
210 | struct list_head entry; | |
211 | struct rdac_dh_data *h; | |
212 | activate_complete callback_fn; | |
213 | void *callback_data; | |
214 | }; | |
215 | ||
fbd7ab3e CS |
216 | static LIST_HEAD(ctlr_list); |
217 | static DEFINE_SPINLOCK(list_lock); | |
970f3f47 CS |
218 | static struct workqueue_struct *kmpath_rdacd; |
219 | static void send_mode_select(struct work_struct *work); | |
fbd7ab3e | 220 | |
dd784edc MB |
221 | /* |
222 | * module parameter to enable rdac debug logging. | |
223 | * 2 bits for each type of logging, only two types defined for now | |
224 | * Can be enhanced if required at later point | |
225 | */ | |
226 | static int rdac_logging = 1; | |
227 | module_param(rdac_logging, int, S_IRUGO|S_IWUSR); | |
228 | MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, " | |
229 | "Default is 1 - failover logging enabled, " | |
230 | "set it to 0xF to enable all the logs"); | |
231 | ||
232 | #define RDAC_LOG_FAILOVER 0 | |
233 | #define RDAC_LOG_SENSE 2 | |
234 | ||
235 | #define RDAC_LOG_BITS 2 | |
236 | ||
237 | #define RDAC_LOG_LEVEL(SHIFT) \ | |
238 | ((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1)) | |
239 | ||
240 | #define RDAC_LOG(SHIFT, sdev, f, arg...) \ | |
241 | do { \ | |
242 | if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \ | |
243 | sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \ | |
244 | } while (0); | |
245 | ||
fbd7ab3e CS |
246 | static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev) |
247 | { | |
248 | struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data; | |
249 | BUG_ON(scsi_dh_data == NULL); | |
250 | return ((struct rdac_dh_data *) scsi_dh_data->buf); | |
251 | } | |
252 | ||
253 | static struct request *get_rdac_req(struct scsi_device *sdev, | |
254 | void *buffer, unsigned buflen, int rw) | |
255 | { | |
256 | struct request *rq; | |
257 | struct request_queue *q = sdev->request_queue; | |
fbd7ab3e | 258 | |
ca9f0089 | 259 | rq = blk_get_request(q, rw, GFP_NOIO); |
fbd7ab3e CS |
260 | |
261 | if (!rq) { | |
262 | sdev_printk(KERN_INFO, sdev, | |
263 | "get_rdac_req: blk_get_request failed.\n"); | |
264 | return NULL; | |
265 | } | |
266 | ||
ca9f0089 | 267 | if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) { |
fbd7ab3e CS |
268 | blk_put_request(rq); |
269 | sdev_printk(KERN_INFO, sdev, | |
270 | "get_rdac_req: blk_rq_map_kern failed.\n"); | |
271 | return NULL; | |
272 | } | |
273 | ||
fbd7ab3e | 274 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
6000a368 MC |
275 | rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | |
276 | REQ_FAILFAST_DRIVER; | |
fbd7ab3e CS |
277 | rq->retries = RDAC_RETRIES; |
278 | rq->timeout = RDAC_TIMEOUT; | |
279 | ||
280 | return rq; | |
281 | } | |
282 | ||
ca9f0089 | 283 | static struct request *rdac_failover_get(struct scsi_device *sdev, |
04b6e153 | 284 | struct rdac_dh_data *h, struct list_head *list) |
fbd7ab3e CS |
285 | { |
286 | struct request *rq; | |
287 | struct rdac_mode_common *common; | |
288 | unsigned data_size; | |
04b6e153 MB |
289 | struct rdac_queue_data *qdata; |
290 | u8 *lun_table; | |
fbd7ab3e CS |
291 | |
292 | if (h->ctlr->use_ms10) { | |
293 | struct rdac_pg_expanded *rdac_pg; | |
294 | ||
295 | data_size = sizeof(struct rdac_pg_expanded); | |
296 | rdac_pg = &h->ctlr->mode_select.expanded; | |
297 | memset(rdac_pg, 0, data_size); | |
298 | common = &rdac_pg->common; | |
299 | rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40; | |
300 | rdac_pg->subpage_code = 0x1; | |
301 | rdac_pg->page_len[0] = 0x01; | |
302 | rdac_pg->page_len[1] = 0x28; | |
04b6e153 | 303 | lun_table = rdac_pg->lun_table; |
fbd7ab3e CS |
304 | } else { |
305 | struct rdac_pg_legacy *rdac_pg; | |
306 | ||
307 | data_size = sizeof(struct rdac_pg_legacy); | |
308 | rdac_pg = &h->ctlr->mode_select.legacy; | |
309 | memset(rdac_pg, 0, data_size); | |
310 | common = &rdac_pg->common; | |
311 | rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER; | |
312 | rdac_pg->page_len = 0x68; | |
04b6e153 | 313 | lun_table = rdac_pg->lun_table; |
fbd7ab3e CS |
314 | } |
315 | common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS; | |
316 | common->quiescence_timeout = RDAC_QUIESCENCE_TIME; | |
317 | common->rdac_options = RDAC_FORCED_QUIESENCE; | |
318 | ||
04b6e153 MB |
319 | list_for_each_entry(qdata, list, entry) { |
320 | lun_table[qdata->h->lun] = 0x81; | |
321 | } | |
322 | ||
fbd7ab3e CS |
323 | /* get request for block layer packet command */ |
324 | rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE); | |
325 | if (!rq) | |
326 | return NULL; | |
327 | ||
328 | /* Prepare the command. */ | |
329 | if (h->ctlr->use_ms10) { | |
330 | rq->cmd[0] = MODE_SELECT_10; | |
331 | rq->cmd[7] = data_size >> 8; | |
332 | rq->cmd[8] = data_size & 0xff; | |
333 | } else { | |
334 | rq->cmd[0] = MODE_SELECT; | |
335 | rq->cmd[4] = data_size; | |
336 | } | |
337 | rq->cmd_len = COMMAND_SIZE(rq->cmd[0]); | |
338 | ||
ca9f0089 HR |
339 | rq->sense = h->sense; |
340 | memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); | |
341 | rq->sense_len = 0; | |
342 | ||
fbd7ab3e CS |
343 | return rq; |
344 | } | |
345 | ||
346 | static void release_controller(struct kref *kref) | |
347 | { | |
348 | struct rdac_controller *ctlr; | |
349 | ctlr = container_of(kref, struct rdac_controller, kref); | |
350 | ||
970f3f47 | 351 | flush_workqueue(kmpath_rdacd); |
fbd7ab3e CS |
352 | spin_lock(&list_lock); |
353 | list_del(&ctlr->node); | |
354 | spin_unlock(&list_lock); | |
355 | kfree(ctlr); | |
356 | } | |
357 | ||
1527666e MB |
358 | static struct rdac_controller *get_controller(u8 *subsys_id, u8 *slot_id, |
359 | char *array_name) | |
fbd7ab3e CS |
360 | { |
361 | struct rdac_controller *ctlr, *tmp; | |
362 | ||
363 | spin_lock(&list_lock); | |
364 | ||
365 | list_for_each_entry(tmp, &ctlr_list, node) { | |
366 | if ((memcmp(tmp->subsys_id, subsys_id, SUBSYS_ID_LEN) == 0) && | |
367 | (memcmp(tmp->slot_id, slot_id, SLOT_ID_LEN) == 0)) { | |
368 | kref_get(&tmp->kref); | |
369 | spin_unlock(&list_lock); | |
370 | return tmp; | |
371 | } | |
372 | } | |
373 | ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC); | |
374 | if (!ctlr) | |
375 | goto done; | |
376 | ||
377 | /* initialize fields of controller */ | |
378 | memcpy(ctlr->subsys_id, subsys_id, SUBSYS_ID_LEN); | |
379 | memcpy(ctlr->slot_id, slot_id, SLOT_ID_LEN); | |
1527666e MB |
380 | memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN); |
381 | ||
382 | /* update the controller index */ | |
383 | if (slot_id[1] == 0x31) | |
384 | ctlr->index = 0; | |
385 | else | |
386 | ctlr->index = 1; | |
387 | ||
fbd7ab3e CS |
388 | kref_init(&ctlr->kref); |
389 | ctlr->use_ms10 = -1; | |
970f3f47 CS |
390 | ctlr->ms_queued = 0; |
391 | ctlr->ms_sdev = NULL; | |
392 | spin_lock_init(&ctlr->ms_lock); | |
393 | INIT_WORK(&ctlr->ms_work, send_mode_select); | |
394 | INIT_LIST_HEAD(&ctlr->ms_head); | |
fbd7ab3e CS |
395 | list_add(&ctlr->node, &ctlr_list); |
396 | done: | |
397 | spin_unlock(&list_lock); | |
398 | return ctlr; | |
399 | } | |
400 | ||
401 | static int submit_inquiry(struct scsi_device *sdev, int page_code, | |
ca9f0089 | 402 | unsigned int len, struct rdac_dh_data *h) |
fbd7ab3e CS |
403 | { |
404 | struct request *rq; | |
405 | struct request_queue *q = sdev->request_queue; | |
fbd7ab3e CS |
406 | int err = SCSI_DH_RES_TEMP_UNAVAIL; |
407 | ||
408 | rq = get_rdac_req(sdev, &h->inq, len, READ); | |
409 | if (!rq) | |
410 | goto done; | |
411 | ||
412 | /* Prepare the command. */ | |
413 | rq->cmd[0] = INQUIRY; | |
414 | rq->cmd[1] = 1; | |
415 | rq->cmd[2] = page_code; | |
416 | rq->cmd[4] = len; | |
417 | rq->cmd_len = COMMAND_SIZE(INQUIRY); | |
ca9f0089 HR |
418 | |
419 | rq->sense = h->sense; | |
420 | memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); | |
421 | rq->sense_len = 0; | |
422 | ||
fbd7ab3e CS |
423 | err = blk_execute_rq(q, NULL, rq, 1); |
424 | if (err == -EIO) | |
425 | err = SCSI_DH_IO; | |
ca9f0089 HR |
426 | |
427 | blk_put_request(rq); | |
fbd7ab3e CS |
428 | done: |
429 | return err; | |
430 | } | |
431 | ||
1527666e MB |
432 | static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h, |
433 | char *array_name) | |
fbd7ab3e | 434 | { |
1527666e | 435 | int err, i; |
fbd7ab3e | 436 | struct c8_inquiry *inqp; |
fbd7ab3e | 437 | |
ca9f0089 | 438 | err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h); |
fbd7ab3e CS |
439 | if (err == SCSI_DH_OK) { |
440 | inqp = &h->inq.c8; | |
ca9f0089 HR |
441 | if (inqp->page_code != 0xc8) |
442 | return SCSI_DH_NOSYS; | |
443 | if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' || | |
444 | inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd') | |
445 | return SCSI_DH_NOSYS; | |
8479fca1 | 446 | h->lun = inqp->lun[7]; /* Uses only the last byte */ |
1527666e MB |
447 | |
448 | for(i=0; i<ARRAY_LABEL_LEN-1; ++i) | |
449 | *(array_name+i) = inqp->array_user_label[(2*i)+1]; | |
450 | ||
451 | *(array_name+ARRAY_LABEL_LEN-1) = '\0'; | |
fbd7ab3e CS |
452 | } |
453 | return err; | |
454 | } | |
455 | ||
ca9f0089 | 456 | static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h) |
fbd7ab3e CS |
457 | { |
458 | int err; | |
459 | struct c9_inquiry *inqp; | |
fbd7ab3e | 460 | |
fe42625c | 461 | h->lun_state = RDAC_LUN_UNOWNED; |
9eece961 | 462 | h->state = RDAC_STATE_ACTIVE; |
ca9f0089 | 463 | err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h); |
fbd7ab3e | 464 | if (err == SCSI_DH_OK) { |
fbd7ab3e | 465 | inqp = &h->inq.c9; |
ca9f0089 HR |
466 | if ((inqp->avte_cvp >> 7) == 0x1) { |
467 | /* LUN in AVT mode */ | |
468 | sdev_printk(KERN_NOTICE, sdev, | |
469 | "%s: AVT mode detected\n", | |
470 | RDAC_NAME); | |
471 | h->lun_state = RDAC_LUN_AVT; | |
472 | } else if ((inqp->avte_cvp & 0x1) != 0) { | |
473 | /* LUN was owned by the controller */ | |
474 | h->lun_state = RDAC_LUN_OWNED; | |
475 | } | |
476 | } | |
477 | ||
5a36756b CS |
478 | if (h->lun_state == RDAC_LUN_UNOWNED) |
479 | h->state = RDAC_STATE_PASSIVE; | |
480 | ||
fbd7ab3e CS |
481 | return err; |
482 | } | |
483 | ||
ca9f0089 | 484 | static int initialize_controller(struct scsi_device *sdev, |
1527666e | 485 | struct rdac_dh_data *h, char *array_name) |
fbd7ab3e CS |
486 | { |
487 | int err; | |
488 | struct c4_inquiry *inqp; | |
fbd7ab3e | 489 | |
ca9f0089 | 490 | err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h); |
fbd7ab3e CS |
491 | if (err == SCSI_DH_OK) { |
492 | inqp = &h->inq.c4; | |
1527666e MB |
493 | h->ctlr = get_controller(inqp->subsys_id, inqp->slot_id, |
494 | array_name); | |
fbd7ab3e CS |
495 | if (!h->ctlr) |
496 | err = SCSI_DH_RES_TEMP_UNAVAIL; | |
497 | } | |
498 | return err; | |
499 | } | |
500 | ||
ca9f0089 | 501 | static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h) |
fbd7ab3e CS |
502 | { |
503 | int err; | |
504 | struct c2_inquiry *inqp; | |
fbd7ab3e | 505 | |
ca9f0089 | 506 | err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h); |
fbd7ab3e CS |
507 | if (err == SCSI_DH_OK) { |
508 | inqp = &h->inq.c2; | |
509 | /* | |
510 | * If more than MODE6_MAX_LUN luns are supported, use | |
511 | * mode select 10 | |
512 | */ | |
513 | if (inqp->max_lun_supported >= MODE6_MAX_LUN) | |
514 | h->ctlr->use_ms10 = 1; | |
515 | else | |
516 | h->ctlr->use_ms10 = 0; | |
517 | } | |
518 | return err; | |
519 | } | |
520 | ||
ca9f0089 | 521 | static int mode_select_handle_sense(struct scsi_device *sdev, |
970f3f47 | 522 | unsigned char *sensebuf) |
fbd7ab3e CS |
523 | { |
524 | struct scsi_sense_hdr sense_hdr; | |
7687fb92 | 525 | int err = SCSI_DH_IO, ret; |
dd784edc | 526 | struct rdac_dh_data *h = get_rdac_data(sdev); |
fbd7ab3e | 527 | |
ca9f0089 | 528 | ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr); |
fbd7ab3e CS |
529 | if (!ret) |
530 | goto done; | |
531 | ||
7687fb92 CV |
532 | switch (sense_hdr.sense_key) { |
533 | case NO_SENSE: | |
534 | case ABORTED_COMMAND: | |
535 | case UNIT_ATTENTION: | |
fbd7ab3e | 536 | err = SCSI_DH_RETRY; |
7687fb92 CV |
537 | break; |
538 | case NOT_READY: | |
539 | if (sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x01) | |
540 | /* LUN Not Ready and is in the Process of Becoming | |
541 | * Ready | |
542 | */ | |
543 | err = SCSI_DH_RETRY; | |
544 | break; | |
545 | case ILLEGAL_REQUEST: | |
546 | if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36) | |
547 | /* | |
548 | * Command Lock contention | |
549 | */ | |
550 | err = SCSI_DH_RETRY; | |
551 | break; | |
552 | default: | |
dd784edc | 553 | break; |
fbd7ab3e CS |
554 | } |
555 | ||
dd784edc MB |
556 | RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " |
557 | "MODE_SELECT returned with sense %02x/%02x/%02x", | |
558 | (char *) h->ctlr->array_name, h->ctlr->index, | |
559 | sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq); | |
560 | ||
fbd7ab3e CS |
561 | done: |
562 | return err; | |
563 | } | |
564 | ||
970f3f47 | 565 | static void send_mode_select(struct work_struct *work) |
fbd7ab3e | 566 | { |
970f3f47 CS |
567 | struct rdac_controller *ctlr = |
568 | container_of(work, struct rdac_controller, ms_work); | |
fbd7ab3e | 569 | struct request *rq; |
970f3f47 CS |
570 | struct scsi_device *sdev = ctlr->ms_sdev; |
571 | struct rdac_dh_data *h = get_rdac_data(sdev); | |
fbd7ab3e | 572 | struct request_queue *q = sdev->request_queue; |
c85f8cb9 | 573 | int err, retry_cnt = RDAC_RETRY_COUNT; |
970f3f47 CS |
574 | struct rdac_queue_data *tmp, *qdata; |
575 | LIST_HEAD(list); | |
970f3f47 CS |
576 | |
577 | spin_lock(&ctlr->ms_lock); | |
578 | list_splice_init(&ctlr->ms_head, &list); | |
579 | ctlr->ms_queued = 0; | |
580 | ctlr->ms_sdev = NULL; | |
581 | spin_unlock(&ctlr->ms_lock); | |
582 | ||
c85f8cb9 CS |
583 | retry: |
584 | err = SCSI_DH_RES_TEMP_UNAVAIL; | |
04b6e153 | 585 | rq = rdac_failover_get(sdev, h, &list); |
fbd7ab3e CS |
586 | if (!rq) |
587 | goto done; | |
588 | ||
dd784edc MB |
589 | RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " |
590 | "%s MODE_SELECT command", | |
591 | (char *) h->ctlr->array_name, h->ctlr->index, | |
c85f8cb9 | 592 | (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying"); |
fbd7ab3e CS |
593 | |
594 | err = blk_execute_rq(q, NULL, rq, 1); | |
c85f8cb9 CS |
595 | blk_put_request(rq); |
596 | if (err != SCSI_DH_OK) { | |
ca9f0089 | 597 | err = mode_select_handle_sense(sdev, h->sense); |
c85f8cb9 CS |
598 | if (err == SCSI_DH_RETRY && retry_cnt--) |
599 | goto retry; | |
600 | } | |
dd784edc | 601 | if (err == SCSI_DH_OK) { |
fbd7ab3e | 602 | h->state = RDAC_STATE_ACTIVE; |
dd784edc MB |
603 | RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " |
604 | "MODE_SELECT completed", | |
605 | (char *) h->ctlr->array_name, h->ctlr->index); | |
606 | } | |
ca9f0089 | 607 | |
fbd7ab3e | 608 | done: |
970f3f47 CS |
609 | list_for_each_entry_safe(qdata, tmp, &list, entry) { |
610 | list_del(&qdata->entry); | |
611 | if (err == SCSI_DH_OK) | |
612 | qdata->h->state = RDAC_STATE_ACTIVE; | |
613 | if (qdata->callback_fn) | |
614 | qdata->callback_fn(qdata->callback_data, err); | |
615 | kfree(qdata); | |
616 | } | |
617 | return; | |
618 | } | |
619 | ||
620 | static int queue_mode_select(struct scsi_device *sdev, | |
621 | activate_complete fn, void *data) | |
622 | { | |
623 | struct rdac_queue_data *qdata; | |
624 | struct rdac_controller *ctlr; | |
625 | ||
626 | qdata = kzalloc(sizeof(*qdata), GFP_KERNEL); | |
627 | if (!qdata) | |
628 | return SCSI_DH_RETRY; | |
629 | ||
630 | qdata->h = get_rdac_data(sdev); | |
631 | qdata->callback_fn = fn; | |
632 | qdata->callback_data = data; | |
633 | ||
634 | ctlr = qdata->h->ctlr; | |
635 | spin_lock(&ctlr->ms_lock); | |
636 | list_add_tail(&qdata->entry, &ctlr->ms_head); | |
637 | if (!ctlr->ms_queued) { | |
638 | ctlr->ms_queued = 1; | |
639 | ctlr->ms_sdev = sdev; | |
640 | queue_work(kmpath_rdacd, &ctlr->ms_work); | |
641 | } | |
642 | spin_unlock(&ctlr->ms_lock); | |
643 | return SCSI_DH_OK; | |
fbd7ab3e CS |
644 | } |
645 | ||
3ae31f6a CS |
646 | static int rdac_activate(struct scsi_device *sdev, |
647 | activate_complete fn, void *data) | |
fbd7ab3e CS |
648 | { |
649 | struct rdac_dh_data *h = get_rdac_data(sdev); | |
650 | int err = SCSI_DH_OK; | |
651 | ||
ca9f0089 HR |
652 | err = check_ownership(sdev, h); |
653 | if (err != SCSI_DH_OK) | |
fbd7ab3e | 654 | goto done; |
fbd7ab3e | 655 | |
970f3f47 CS |
656 | if (h->lun_state == RDAC_LUN_UNOWNED) { |
657 | err = queue_mode_select(sdev, fn, data); | |
658 | if (err == SCSI_DH_OK) | |
659 | return 0; | |
660 | } | |
fbd7ab3e | 661 | done: |
3ae31f6a CS |
662 | if (fn) |
663 | fn(data, err); | |
664 | return 0; | |
fbd7ab3e CS |
665 | } |
666 | ||
667 | static int rdac_prep_fn(struct scsi_device *sdev, struct request *req) | |
668 | { | |
669 | struct rdac_dh_data *h = get_rdac_data(sdev); | |
670 | int ret = BLKPREP_OK; | |
671 | ||
672 | if (h->state != RDAC_STATE_ACTIVE) { | |
673 | ret = BLKPREP_KILL; | |
674 | req->cmd_flags |= REQ_QUIET; | |
675 | } | |
676 | return ret; | |
677 | ||
678 | } | |
679 | ||
680 | static int rdac_check_sense(struct scsi_device *sdev, | |
681 | struct scsi_sense_hdr *sense_hdr) | |
682 | { | |
683 | struct rdac_dh_data *h = get_rdac_data(sdev); | |
dd784edc MB |
684 | |
685 | RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, " | |
686 | "I/O returned with sense %02x/%02x/%02x", | |
687 | (char *) h->ctlr->array_name, h->ctlr->index, | |
688 | sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq); | |
689 | ||
fbd7ab3e CS |
690 | switch (sense_hdr->sense_key) { |
691 | case NOT_READY: | |
8f032263 CV |
692 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01) |
693 | /* LUN Not Ready - Logical Unit Not Ready and is in | |
694 | * the process of becoming ready | |
695 | * Just retry. | |
696 | */ | |
697 | return ADD_TO_MLQUEUE; | |
fbd7ab3e CS |
698 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81) |
699 | /* LUN Not Ready - Storage firmware incompatible | |
700 | * Manual code synchonisation required. | |
701 | * | |
702 | * Nothing we can do here. Try to bypass the path. | |
703 | */ | |
704 | return SUCCESS; | |
705 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1) | |
706 | /* LUN Not Ready - Quiescense in progress | |
707 | * | |
708 | * Just retry and wait. | |
709 | */ | |
c7dbb627 | 710 | return ADD_TO_MLQUEUE; |
af50bb99 CV |
711 | if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02) |
712 | /* LUN Not Ready - Quiescense in progress | |
713 | * or has been achieved | |
714 | * Just retry. | |
715 | */ | |
716 | return ADD_TO_MLQUEUE; | |
fbd7ab3e CS |
717 | break; |
718 | case ILLEGAL_REQUEST: | |
719 | if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) { | |
720 | /* Invalid Request - Current Logical Unit Ownership. | |
721 | * Controller is not the current owner of the LUN, | |
722 | * Fail the path, so that the other path be used. | |
723 | */ | |
724 | h->state = RDAC_STATE_PASSIVE; | |
725 | return SUCCESS; | |
726 | } | |
727 | break; | |
728 | case UNIT_ATTENTION: | |
729 | if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00) | |
730 | /* | |
731 | * Power On, Reset, or Bus Device Reset, just retry. | |
ea41e415 CV |
732 | */ |
733 | return ADD_TO_MLQUEUE; | |
734 | if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02) | |
735 | /* | |
736 | * Quiescence in progress , just retry. | |
fbd7ab3e | 737 | */ |
c7dbb627 | 738 | return ADD_TO_MLQUEUE; |
fbd7ab3e CS |
739 | break; |
740 | } | |
741 | /* success just means we do not care what scsi-ml does */ | |
742 | return SCSI_RETURN_NOT_HANDLED; | |
743 | } | |
744 | ||
f08c0761 | 745 | static const struct scsi_dh_devlist rdac_dev_list[] = { |
fbd7ab3e CS |
746 | {"IBM", "1722"}, |
747 | {"IBM", "1724"}, | |
748 | {"IBM", "1726"}, | |
749 | {"IBM", "1742"}, | |
6f4fdda4 MB |
750 | {"IBM", "1745"}, |
751 | {"IBM", "1746"}, | |
fbd7ab3e CS |
752 | {"IBM", "1814"}, |
753 | {"IBM", "1815"}, | |
754 | {"IBM", "1818"}, | |
755 | {"IBM", "3526"}, | |
756 | {"SGI", "TP9400"}, | |
757 | {"SGI", "TP9500"}, | |
758 | {"SGI", "IS"}, | |
759 | {"STK", "OPENstorage D280"}, | |
760 | {"SUN", "CSM200_R"}, | |
5bab0885 CB |
761 | {"SUN", "LCSM100_I"}, |
762 | {"SUN", "LCSM100_S"}, | |
763 | {"SUN", "LCSM100_E"}, | |
fbd7ab3e | 764 | {"SUN", "LCSM100_F"}, |
650849d7 YD |
765 | {"DELL", "MD3000"}, |
766 | {"DELL", "MD3000i"}, | |
cdf69bb9 YD |
767 | {"DELL", "MD32xx"}, |
768 | {"DELL", "MD32xxi"}, | |
2cf75f1c | 769 | {"DELL", "MD36xxi"}, |
bc898c97 | 770 | {"DELL", "MD36xxf"}, |
273c4781 BM |
771 | {"LSI", "INF-01-00"}, |
772 | {"ENGENIO", "INF-01-00"}, | |
4dbfb544 CS |
773 | {"STK", "FLEXLINE 380"}, |
774 | {"SUN", "CSM100_R_FC"}, | |
15660676 CV |
775 | {"SUN", "STK6580_6780"}, |
776 | {"SUN", "SUN_6180"}, | |
fbd7ab3e CS |
777 | {NULL, NULL}, |
778 | }; | |
779 | ||
765cbc6d HR |
780 | static int rdac_bus_attach(struct scsi_device *sdev); |
781 | static void rdac_bus_detach(struct scsi_device *sdev); | |
fbd7ab3e CS |
782 | |
783 | static struct scsi_device_handler rdac_dh = { | |
784 | .name = RDAC_NAME, | |
785 | .module = THIS_MODULE, | |
765cbc6d | 786 | .devlist = rdac_dev_list, |
fbd7ab3e CS |
787 | .prep_fn = rdac_prep_fn, |
788 | .check_sense = rdac_check_sense, | |
765cbc6d HR |
789 | .attach = rdac_bus_attach, |
790 | .detach = rdac_bus_detach, | |
fbd7ab3e CS |
791 | .activate = rdac_activate, |
792 | }; | |
793 | ||
765cbc6d | 794 | static int rdac_bus_attach(struct scsi_device *sdev) |
fbd7ab3e | 795 | { |
fbd7ab3e CS |
796 | struct scsi_dh_data *scsi_dh_data; |
797 | struct rdac_dh_data *h; | |
fbd7ab3e | 798 | unsigned long flags; |
ca9f0089 | 799 | int err; |
1527666e | 800 | char array_name[ARRAY_LABEL_LEN]; |
fbd7ab3e | 801 | |
9dfeb315 | 802 | scsi_dh_data = kzalloc(sizeof(*scsi_dh_data) |
765cbc6d HR |
803 | + sizeof(*h) , GFP_KERNEL); |
804 | if (!scsi_dh_data) { | |
ca9f0089 | 805 | sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n", |
765cbc6d | 806 | RDAC_NAME); |
33af79d1 | 807 | return 0; |
765cbc6d | 808 | } |
33af79d1 | 809 | |
765cbc6d HR |
810 | scsi_dh_data->scsi_dh = &rdac_dh; |
811 | h = (struct rdac_dh_data *) scsi_dh_data->buf; | |
812 | h->lun = UNINITIALIZED_LUN; | |
813 | h->state = RDAC_STATE_ACTIVE; | |
ca9f0089 | 814 | |
1527666e | 815 | err = get_lun_info(sdev, h, array_name); |
ca9f0089 HR |
816 | if (err != SCSI_DH_OK) |
817 | goto failed; | |
818 | ||
1527666e | 819 | err = initialize_controller(sdev, h, array_name); |
ca9f0089 HR |
820 | if (err != SCSI_DH_OK) |
821 | goto failed; | |
822 | ||
87b79a53 MB |
823 | err = check_ownership(sdev, h); |
824 | if (err != SCSI_DH_OK) | |
825 | goto clean_ctlr; | |
826 | ||
827 | err = set_mode_select(sdev, h); | |
828 | if (err != SCSI_DH_OK) | |
829 | goto clean_ctlr; | |
830 | ||
ca9f0089 | 831 | if (!try_module_get(THIS_MODULE)) |
87b79a53 | 832 | goto clean_ctlr; |
ca9f0089 | 833 | |
765cbc6d HR |
834 | spin_lock_irqsave(sdev->request_queue->queue_lock, flags); |
835 | sdev->scsi_dh_data = scsi_dh_data; | |
836 | spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); | |
fbd7ab3e | 837 | |
ca9f0089 HR |
838 | sdev_printk(KERN_NOTICE, sdev, |
839 | "%s: LUN %d (%s)\n", | |
840 | RDAC_NAME, h->lun, lun_state[(int)h->lun_state]); | |
fbd7ab3e | 841 | |
fbd7ab3e | 842 | return 0; |
ca9f0089 | 843 | |
87b79a53 MB |
844 | clean_ctlr: |
845 | kref_put(&h->ctlr->kref, release_controller); | |
846 | ||
ca9f0089 HR |
847 | failed: |
848 | kfree(scsi_dh_data); | |
849 | sdev_printk(KERN_ERR, sdev, "%s: not attached\n", | |
850 | RDAC_NAME); | |
851 | return -EINVAL; | |
fbd7ab3e CS |
852 | } |
853 | ||
765cbc6d HR |
854 | static void rdac_bus_detach( struct scsi_device *sdev ) |
855 | { | |
856 | struct scsi_dh_data *scsi_dh_data; | |
857 | struct rdac_dh_data *h; | |
858 | unsigned long flags; | |
859 | ||
860 | spin_lock_irqsave(sdev->request_queue->queue_lock, flags); | |
861 | scsi_dh_data = sdev->scsi_dh_data; | |
862 | sdev->scsi_dh_data = NULL; | |
863 | spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); | |
864 | ||
865 | h = (struct rdac_dh_data *) scsi_dh_data->buf; | |
866 | if (h->ctlr) | |
867 | kref_put(&h->ctlr->kref, release_controller); | |
868 | kfree(scsi_dh_data); | |
869 | module_put(THIS_MODULE); | |
ca9f0089 | 870 | sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME); |
765cbc6d HR |
871 | } |
872 | ||
873 | ||
874 | ||
fbd7ab3e CS |
875 | static int __init rdac_init(void) |
876 | { | |
877 | int r; | |
878 | ||
879 | r = scsi_register_device_handler(&rdac_dh); | |
970f3f47 | 880 | if (r != 0) { |
fbd7ab3e | 881 | printk(KERN_ERR "Failed to register scsi device handler."); |
970f3f47 CS |
882 | goto done; |
883 | } | |
884 | ||
885 | /* | |
886 | * Create workqueue to handle mode selects for rdac | |
887 | */ | |
888 | kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd"); | |
889 | if (!kmpath_rdacd) { | |
890 | scsi_unregister_device_handler(&rdac_dh); | |
891 | printk(KERN_ERR "kmpath_rdacd creation failed.\n"); | |
892 | } | |
893 | done: | |
fbd7ab3e CS |
894 | return r; |
895 | } | |
896 | ||
897 | static void __exit rdac_exit(void) | |
898 | { | |
970f3f47 | 899 | destroy_workqueue(kmpath_rdacd); |
fbd7ab3e CS |
900 | scsi_unregister_device_handler(&rdac_dh); |
901 | } | |
902 | ||
903 | module_init(rdac_init); | |
904 | module_exit(rdac_exit); | |
905 | ||
906 | MODULE_DESCRIPTION("Multipath LSI/Engenio RDAC driver"); | |
907 | MODULE_AUTHOR("Mike Christie, Chandra Seetharaman"); | |
a0b990c6 | 908 | MODULE_VERSION("01.00.0000.0000"); |
fbd7ab3e | 909 | MODULE_LICENSE("GPL"); |