Commit | Line | Data |
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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 HR |
283 | static struct request *rdac_failover_get(struct scsi_device *sdev, |
284 | struct rdac_dh_data *h) | |
fbd7ab3e CS |
285 | { |
286 | struct request *rq; | |
287 | struct rdac_mode_common *common; | |
288 | unsigned data_size; | |
fbd7ab3e CS |
289 | |
290 | if (h->ctlr->use_ms10) { | |
291 | struct rdac_pg_expanded *rdac_pg; | |
292 | ||
293 | data_size = sizeof(struct rdac_pg_expanded); | |
294 | rdac_pg = &h->ctlr->mode_select.expanded; | |
295 | memset(rdac_pg, 0, data_size); | |
296 | common = &rdac_pg->common; | |
297 | rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40; | |
298 | rdac_pg->subpage_code = 0x1; | |
299 | rdac_pg->page_len[0] = 0x01; | |
300 | rdac_pg->page_len[1] = 0x28; | |
fbd7ab3e CS |
301 | } else { |
302 | struct rdac_pg_legacy *rdac_pg; | |
303 | ||
304 | data_size = sizeof(struct rdac_pg_legacy); | |
305 | rdac_pg = &h->ctlr->mode_select.legacy; | |
306 | memset(rdac_pg, 0, data_size); | |
307 | common = &rdac_pg->common; | |
308 | rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER; | |
309 | rdac_pg->page_len = 0x68; | |
fbd7ab3e CS |
310 | } |
311 | common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS; | |
312 | common->quiescence_timeout = RDAC_QUIESCENCE_TIME; | |
313 | common->rdac_options = RDAC_FORCED_QUIESENCE; | |
314 | ||
315 | /* get request for block layer packet command */ | |
316 | rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE); | |
317 | if (!rq) | |
318 | return NULL; | |
319 | ||
320 | /* Prepare the command. */ | |
321 | if (h->ctlr->use_ms10) { | |
322 | rq->cmd[0] = MODE_SELECT_10; | |
323 | rq->cmd[7] = data_size >> 8; | |
324 | rq->cmd[8] = data_size & 0xff; | |
325 | } else { | |
326 | rq->cmd[0] = MODE_SELECT; | |
327 | rq->cmd[4] = data_size; | |
328 | } | |
329 | rq->cmd_len = COMMAND_SIZE(rq->cmd[0]); | |
330 | ||
ca9f0089 HR |
331 | rq->sense = h->sense; |
332 | memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); | |
333 | rq->sense_len = 0; | |
334 | ||
fbd7ab3e CS |
335 | return rq; |
336 | } | |
337 | ||
338 | static void release_controller(struct kref *kref) | |
339 | { | |
340 | struct rdac_controller *ctlr; | |
341 | ctlr = container_of(kref, struct rdac_controller, kref); | |
342 | ||
970f3f47 | 343 | flush_workqueue(kmpath_rdacd); |
fbd7ab3e CS |
344 | spin_lock(&list_lock); |
345 | list_del(&ctlr->node); | |
346 | spin_unlock(&list_lock); | |
347 | kfree(ctlr); | |
348 | } | |
349 | ||
1527666e MB |
350 | static struct rdac_controller *get_controller(u8 *subsys_id, u8 *slot_id, |
351 | char *array_name) | |
fbd7ab3e CS |
352 | { |
353 | struct rdac_controller *ctlr, *tmp; | |
354 | ||
355 | spin_lock(&list_lock); | |
356 | ||
357 | list_for_each_entry(tmp, &ctlr_list, node) { | |
358 | if ((memcmp(tmp->subsys_id, subsys_id, SUBSYS_ID_LEN) == 0) && | |
359 | (memcmp(tmp->slot_id, slot_id, SLOT_ID_LEN) == 0)) { | |
360 | kref_get(&tmp->kref); | |
361 | spin_unlock(&list_lock); | |
362 | return tmp; | |
363 | } | |
364 | } | |
365 | ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC); | |
366 | if (!ctlr) | |
367 | goto done; | |
368 | ||
369 | /* initialize fields of controller */ | |
370 | memcpy(ctlr->subsys_id, subsys_id, SUBSYS_ID_LEN); | |
371 | memcpy(ctlr->slot_id, slot_id, SLOT_ID_LEN); | |
1527666e MB |
372 | memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN); |
373 | ||
374 | /* update the controller index */ | |
375 | if (slot_id[1] == 0x31) | |
376 | ctlr->index = 0; | |
377 | else | |
378 | ctlr->index = 1; | |
379 | ||
fbd7ab3e CS |
380 | kref_init(&ctlr->kref); |
381 | ctlr->use_ms10 = -1; | |
970f3f47 CS |
382 | ctlr->ms_queued = 0; |
383 | ctlr->ms_sdev = NULL; | |
384 | spin_lock_init(&ctlr->ms_lock); | |
385 | INIT_WORK(&ctlr->ms_work, send_mode_select); | |
386 | INIT_LIST_HEAD(&ctlr->ms_head); | |
fbd7ab3e CS |
387 | list_add(&ctlr->node, &ctlr_list); |
388 | done: | |
389 | spin_unlock(&list_lock); | |
390 | return ctlr; | |
391 | } | |
392 | ||
393 | static int submit_inquiry(struct scsi_device *sdev, int page_code, | |
ca9f0089 | 394 | unsigned int len, struct rdac_dh_data *h) |
fbd7ab3e CS |
395 | { |
396 | struct request *rq; | |
397 | struct request_queue *q = sdev->request_queue; | |
fbd7ab3e CS |
398 | int err = SCSI_DH_RES_TEMP_UNAVAIL; |
399 | ||
400 | rq = get_rdac_req(sdev, &h->inq, len, READ); | |
401 | if (!rq) | |
402 | goto done; | |
403 | ||
404 | /* Prepare the command. */ | |
405 | rq->cmd[0] = INQUIRY; | |
406 | rq->cmd[1] = 1; | |
407 | rq->cmd[2] = page_code; | |
408 | rq->cmd[4] = len; | |
409 | rq->cmd_len = COMMAND_SIZE(INQUIRY); | |
ca9f0089 HR |
410 | |
411 | rq->sense = h->sense; | |
412 | memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); | |
413 | rq->sense_len = 0; | |
414 | ||
fbd7ab3e CS |
415 | err = blk_execute_rq(q, NULL, rq, 1); |
416 | if (err == -EIO) | |
417 | err = SCSI_DH_IO; | |
ca9f0089 HR |
418 | |
419 | blk_put_request(rq); | |
fbd7ab3e CS |
420 | done: |
421 | return err; | |
422 | } | |
423 | ||
1527666e MB |
424 | static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h, |
425 | char *array_name) | |
fbd7ab3e | 426 | { |
1527666e | 427 | int err, i; |
fbd7ab3e | 428 | struct c8_inquiry *inqp; |
fbd7ab3e | 429 | |
ca9f0089 | 430 | err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h); |
fbd7ab3e CS |
431 | if (err == SCSI_DH_OK) { |
432 | inqp = &h->inq.c8; | |
ca9f0089 HR |
433 | if (inqp->page_code != 0xc8) |
434 | return SCSI_DH_NOSYS; | |
435 | if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' || | |
436 | inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd') | |
437 | return SCSI_DH_NOSYS; | |
8479fca1 | 438 | h->lun = inqp->lun[7]; /* Uses only the last byte */ |
1527666e MB |
439 | |
440 | for(i=0; i<ARRAY_LABEL_LEN-1; ++i) | |
441 | *(array_name+i) = inqp->array_user_label[(2*i)+1]; | |
442 | ||
443 | *(array_name+ARRAY_LABEL_LEN-1) = '\0'; | |
fbd7ab3e CS |
444 | } |
445 | return err; | |
446 | } | |
447 | ||
ca9f0089 | 448 | static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h) |
fbd7ab3e CS |
449 | { |
450 | int err; | |
451 | struct c9_inquiry *inqp; | |
fbd7ab3e | 452 | |
fe42625c | 453 | h->lun_state = RDAC_LUN_UNOWNED; |
9eece961 | 454 | h->state = RDAC_STATE_ACTIVE; |
ca9f0089 | 455 | err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h); |
fbd7ab3e | 456 | if (err == SCSI_DH_OK) { |
fbd7ab3e | 457 | inqp = &h->inq.c9; |
ca9f0089 HR |
458 | if ((inqp->avte_cvp >> 7) == 0x1) { |
459 | /* LUN in AVT mode */ | |
460 | sdev_printk(KERN_NOTICE, sdev, | |
461 | "%s: AVT mode detected\n", | |
462 | RDAC_NAME); | |
463 | h->lun_state = RDAC_LUN_AVT; | |
464 | } else if ((inqp->avte_cvp & 0x1) != 0) { | |
465 | /* LUN was owned by the controller */ | |
466 | h->lun_state = RDAC_LUN_OWNED; | |
467 | } | |
468 | } | |
469 | ||
5a36756b CS |
470 | if (h->lun_state == RDAC_LUN_UNOWNED) |
471 | h->state = RDAC_STATE_PASSIVE; | |
472 | ||
fbd7ab3e CS |
473 | return err; |
474 | } | |
475 | ||
ca9f0089 | 476 | static int initialize_controller(struct scsi_device *sdev, |
1527666e | 477 | struct rdac_dh_data *h, char *array_name) |
fbd7ab3e CS |
478 | { |
479 | int err; | |
480 | struct c4_inquiry *inqp; | |
fbd7ab3e | 481 | |
ca9f0089 | 482 | err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h); |
fbd7ab3e CS |
483 | if (err == SCSI_DH_OK) { |
484 | inqp = &h->inq.c4; | |
1527666e MB |
485 | h->ctlr = get_controller(inqp->subsys_id, inqp->slot_id, |
486 | array_name); | |
fbd7ab3e CS |
487 | if (!h->ctlr) |
488 | err = SCSI_DH_RES_TEMP_UNAVAIL; | |
489 | } | |
490 | return err; | |
491 | } | |
492 | ||
ca9f0089 | 493 | static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h) |
fbd7ab3e CS |
494 | { |
495 | int err; | |
496 | struct c2_inquiry *inqp; | |
fbd7ab3e | 497 | |
ca9f0089 | 498 | err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h); |
fbd7ab3e CS |
499 | if (err == SCSI_DH_OK) { |
500 | inqp = &h->inq.c2; | |
501 | /* | |
502 | * If more than MODE6_MAX_LUN luns are supported, use | |
503 | * mode select 10 | |
504 | */ | |
505 | if (inqp->max_lun_supported >= MODE6_MAX_LUN) | |
506 | h->ctlr->use_ms10 = 1; | |
507 | else | |
508 | h->ctlr->use_ms10 = 0; | |
509 | } | |
510 | return err; | |
511 | } | |
512 | ||
ca9f0089 | 513 | static int mode_select_handle_sense(struct scsi_device *sdev, |
970f3f47 | 514 | unsigned char *sensebuf) |
fbd7ab3e CS |
515 | { |
516 | struct scsi_sense_hdr sense_hdr; | |
7687fb92 | 517 | int err = SCSI_DH_IO, ret; |
dd784edc | 518 | struct rdac_dh_data *h = get_rdac_data(sdev); |
fbd7ab3e | 519 | |
ca9f0089 | 520 | ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr); |
fbd7ab3e CS |
521 | if (!ret) |
522 | goto done; | |
523 | ||
7687fb92 CV |
524 | switch (sense_hdr.sense_key) { |
525 | case NO_SENSE: | |
526 | case ABORTED_COMMAND: | |
527 | case UNIT_ATTENTION: | |
fbd7ab3e | 528 | err = SCSI_DH_RETRY; |
7687fb92 CV |
529 | break; |
530 | case NOT_READY: | |
531 | if (sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x01) | |
532 | /* LUN Not Ready and is in the Process of Becoming | |
533 | * Ready | |
534 | */ | |
535 | err = SCSI_DH_RETRY; | |
536 | break; | |
537 | case ILLEGAL_REQUEST: | |
538 | if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36) | |
539 | /* | |
540 | * Command Lock contention | |
541 | */ | |
542 | err = SCSI_DH_RETRY; | |
543 | break; | |
544 | default: | |
dd784edc | 545 | break; |
fbd7ab3e CS |
546 | } |
547 | ||
dd784edc MB |
548 | RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " |
549 | "MODE_SELECT returned with sense %02x/%02x/%02x", | |
550 | (char *) h->ctlr->array_name, h->ctlr->index, | |
551 | sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq); | |
552 | ||
fbd7ab3e CS |
553 | done: |
554 | return err; | |
555 | } | |
556 | ||
970f3f47 | 557 | static void send_mode_select(struct work_struct *work) |
fbd7ab3e | 558 | { |
970f3f47 CS |
559 | struct rdac_controller *ctlr = |
560 | container_of(work, struct rdac_controller, ms_work); | |
fbd7ab3e | 561 | struct request *rq; |
970f3f47 CS |
562 | struct scsi_device *sdev = ctlr->ms_sdev; |
563 | struct rdac_dh_data *h = get_rdac_data(sdev); | |
fbd7ab3e | 564 | struct request_queue *q = sdev->request_queue; |
c85f8cb9 | 565 | int err, retry_cnt = RDAC_RETRY_COUNT; |
970f3f47 CS |
566 | struct rdac_queue_data *tmp, *qdata; |
567 | LIST_HEAD(list); | |
568 | u8 *lun_table; | |
569 | ||
570 | spin_lock(&ctlr->ms_lock); | |
571 | list_splice_init(&ctlr->ms_head, &list); | |
572 | ctlr->ms_queued = 0; | |
573 | ctlr->ms_sdev = NULL; | |
574 | spin_unlock(&ctlr->ms_lock); | |
575 | ||
576 | if (ctlr->use_ms10) | |
577 | lun_table = ctlr->mode_select.expanded.lun_table; | |
578 | else | |
579 | lun_table = ctlr->mode_select.legacy.lun_table; | |
fbd7ab3e | 580 | |
c85f8cb9 CS |
581 | retry: |
582 | err = SCSI_DH_RES_TEMP_UNAVAIL; | |
ca9f0089 | 583 | rq = rdac_failover_get(sdev, h); |
fbd7ab3e CS |
584 | if (!rq) |
585 | goto done; | |
586 | ||
970f3f47 CS |
587 | list_for_each_entry(qdata, &list, entry) { |
588 | lun_table[qdata->h->lun] = 0x81; | |
589 | } | |
590 | ||
dd784edc MB |
591 | RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " |
592 | "%s MODE_SELECT command", | |
593 | (char *) h->ctlr->array_name, h->ctlr->index, | |
c85f8cb9 | 594 | (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying"); |
fbd7ab3e CS |
595 | |
596 | err = blk_execute_rq(q, NULL, rq, 1); | |
c85f8cb9 CS |
597 | blk_put_request(rq); |
598 | if (err != SCSI_DH_OK) { | |
ca9f0089 | 599 | err = mode_select_handle_sense(sdev, h->sense); |
c85f8cb9 CS |
600 | if (err == SCSI_DH_RETRY && retry_cnt--) |
601 | goto retry; | |
602 | } | |
dd784edc | 603 | if (err == SCSI_DH_OK) { |
fbd7ab3e | 604 | h->state = RDAC_STATE_ACTIVE; |
dd784edc MB |
605 | RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " |
606 | "MODE_SELECT completed", | |
607 | (char *) h->ctlr->array_name, h->ctlr->index); | |
608 | } | |
ca9f0089 | 609 | |
fbd7ab3e | 610 | done: |
970f3f47 CS |
611 | list_for_each_entry_safe(qdata, tmp, &list, entry) { |
612 | list_del(&qdata->entry); | |
613 | if (err == SCSI_DH_OK) | |
614 | qdata->h->state = RDAC_STATE_ACTIVE; | |
615 | if (qdata->callback_fn) | |
616 | qdata->callback_fn(qdata->callback_data, err); | |
617 | kfree(qdata); | |
618 | } | |
619 | return; | |
620 | } | |
621 | ||
622 | static int queue_mode_select(struct scsi_device *sdev, | |
623 | activate_complete fn, void *data) | |
624 | { | |
625 | struct rdac_queue_data *qdata; | |
626 | struct rdac_controller *ctlr; | |
627 | ||
628 | qdata = kzalloc(sizeof(*qdata), GFP_KERNEL); | |
629 | if (!qdata) | |
630 | return SCSI_DH_RETRY; | |
631 | ||
632 | qdata->h = get_rdac_data(sdev); | |
633 | qdata->callback_fn = fn; | |
634 | qdata->callback_data = data; | |
635 | ||
636 | ctlr = qdata->h->ctlr; | |
637 | spin_lock(&ctlr->ms_lock); | |
638 | list_add_tail(&qdata->entry, &ctlr->ms_head); | |
639 | if (!ctlr->ms_queued) { | |
640 | ctlr->ms_queued = 1; | |
641 | ctlr->ms_sdev = sdev; | |
642 | queue_work(kmpath_rdacd, &ctlr->ms_work); | |
643 | } | |
644 | spin_unlock(&ctlr->ms_lock); | |
645 | return SCSI_DH_OK; | |
fbd7ab3e CS |
646 | } |
647 | ||
3ae31f6a CS |
648 | static int rdac_activate(struct scsi_device *sdev, |
649 | activate_complete fn, void *data) | |
fbd7ab3e CS |
650 | { |
651 | struct rdac_dh_data *h = get_rdac_data(sdev); | |
652 | int err = SCSI_DH_OK; | |
653 | ||
ca9f0089 HR |
654 | err = check_ownership(sdev, h); |
655 | if (err != SCSI_DH_OK) | |
fbd7ab3e | 656 | goto done; |
fbd7ab3e | 657 | |
970f3f47 CS |
658 | if (h->lun_state == RDAC_LUN_UNOWNED) { |
659 | err = queue_mode_select(sdev, fn, data); | |
660 | if (err == SCSI_DH_OK) | |
661 | return 0; | |
662 | } | |
fbd7ab3e | 663 | done: |
3ae31f6a CS |
664 | if (fn) |
665 | fn(data, err); | |
666 | return 0; | |
fbd7ab3e CS |
667 | } |
668 | ||
669 | static int rdac_prep_fn(struct scsi_device *sdev, struct request *req) | |
670 | { | |
671 | struct rdac_dh_data *h = get_rdac_data(sdev); | |
672 | int ret = BLKPREP_OK; | |
673 | ||
674 | if (h->state != RDAC_STATE_ACTIVE) { | |
675 | ret = BLKPREP_KILL; | |
676 | req->cmd_flags |= REQ_QUIET; | |
677 | } | |
678 | return ret; | |
679 | ||
680 | } | |
681 | ||
682 | static int rdac_check_sense(struct scsi_device *sdev, | |
683 | struct scsi_sense_hdr *sense_hdr) | |
684 | { | |
685 | struct rdac_dh_data *h = get_rdac_data(sdev); | |
dd784edc MB |
686 | |
687 | RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, " | |
688 | "I/O returned with sense %02x/%02x/%02x", | |
689 | (char *) h->ctlr->array_name, h->ctlr->index, | |
690 | sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq); | |
691 | ||
fbd7ab3e CS |
692 | switch (sense_hdr->sense_key) { |
693 | case NOT_READY: | |
8f032263 CV |
694 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01) |
695 | /* LUN Not Ready - Logical Unit Not Ready and is in | |
696 | * the process of becoming ready | |
697 | * Just retry. | |
698 | */ | |
699 | return ADD_TO_MLQUEUE; | |
fbd7ab3e CS |
700 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81) |
701 | /* LUN Not Ready - Storage firmware incompatible | |
702 | * Manual code synchonisation required. | |
703 | * | |
704 | * Nothing we can do here. Try to bypass the path. | |
705 | */ | |
706 | return SUCCESS; | |
707 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1) | |
708 | /* LUN Not Ready - Quiescense in progress | |
709 | * | |
710 | * Just retry and wait. | |
711 | */ | |
c7dbb627 | 712 | return ADD_TO_MLQUEUE; |
af50bb99 CV |
713 | if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02) |
714 | /* LUN Not Ready - Quiescense in progress | |
715 | * or has been achieved | |
716 | * Just retry. | |
717 | */ | |
718 | return ADD_TO_MLQUEUE; | |
fbd7ab3e CS |
719 | break; |
720 | case ILLEGAL_REQUEST: | |
721 | if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) { | |
722 | /* Invalid Request - Current Logical Unit Ownership. | |
723 | * Controller is not the current owner of the LUN, | |
724 | * Fail the path, so that the other path be used. | |
725 | */ | |
726 | h->state = RDAC_STATE_PASSIVE; | |
727 | return SUCCESS; | |
728 | } | |
729 | break; | |
730 | case UNIT_ATTENTION: | |
731 | if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00) | |
732 | /* | |
733 | * Power On, Reset, or Bus Device Reset, just retry. | |
ea41e415 CV |
734 | */ |
735 | return ADD_TO_MLQUEUE; | |
736 | if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02) | |
737 | /* | |
738 | * Quiescence in progress , just retry. | |
fbd7ab3e | 739 | */ |
c7dbb627 | 740 | return ADD_TO_MLQUEUE; |
fbd7ab3e CS |
741 | break; |
742 | } | |
743 | /* success just means we do not care what scsi-ml does */ | |
744 | return SCSI_RETURN_NOT_HANDLED; | |
745 | } | |
746 | ||
f08c0761 | 747 | static const struct scsi_dh_devlist rdac_dev_list[] = { |
fbd7ab3e CS |
748 | {"IBM", "1722"}, |
749 | {"IBM", "1724"}, | |
750 | {"IBM", "1726"}, | |
751 | {"IBM", "1742"}, | |
6f4fdda4 MB |
752 | {"IBM", "1745"}, |
753 | {"IBM", "1746"}, | |
fbd7ab3e CS |
754 | {"IBM", "1814"}, |
755 | {"IBM", "1815"}, | |
756 | {"IBM", "1818"}, | |
757 | {"IBM", "3526"}, | |
758 | {"SGI", "TP9400"}, | |
759 | {"SGI", "TP9500"}, | |
760 | {"SGI", "IS"}, | |
761 | {"STK", "OPENstorage D280"}, | |
762 | {"SUN", "CSM200_R"}, | |
5bab0885 CB |
763 | {"SUN", "LCSM100_I"}, |
764 | {"SUN", "LCSM100_S"}, | |
765 | {"SUN", "LCSM100_E"}, | |
fbd7ab3e | 766 | {"SUN", "LCSM100_F"}, |
650849d7 YD |
767 | {"DELL", "MD3000"}, |
768 | {"DELL", "MD3000i"}, | |
cdf69bb9 YD |
769 | {"DELL", "MD32xx"}, |
770 | {"DELL", "MD32xxi"}, | |
273c4781 BM |
771 | {"LSI", "INF-01-00"}, |
772 | {"ENGENIO", "INF-01-00"}, | |
4dbfb544 CS |
773 | {"STK", "FLEXLINE 380"}, |
774 | {"SUN", "CSM100_R_FC"}, | |
fbd7ab3e CS |
775 | {NULL, NULL}, |
776 | }; | |
777 | ||
765cbc6d HR |
778 | static int rdac_bus_attach(struct scsi_device *sdev); |
779 | static void rdac_bus_detach(struct scsi_device *sdev); | |
fbd7ab3e CS |
780 | |
781 | static struct scsi_device_handler rdac_dh = { | |
782 | .name = RDAC_NAME, | |
783 | .module = THIS_MODULE, | |
765cbc6d | 784 | .devlist = rdac_dev_list, |
fbd7ab3e CS |
785 | .prep_fn = rdac_prep_fn, |
786 | .check_sense = rdac_check_sense, | |
765cbc6d HR |
787 | .attach = rdac_bus_attach, |
788 | .detach = rdac_bus_detach, | |
fbd7ab3e CS |
789 | .activate = rdac_activate, |
790 | }; | |
791 | ||
765cbc6d | 792 | static int rdac_bus_attach(struct scsi_device *sdev) |
fbd7ab3e | 793 | { |
fbd7ab3e CS |
794 | struct scsi_dh_data *scsi_dh_data; |
795 | struct rdac_dh_data *h; | |
fbd7ab3e | 796 | unsigned long flags; |
ca9f0089 | 797 | int err; |
1527666e | 798 | char array_name[ARRAY_LABEL_LEN]; |
fbd7ab3e | 799 | |
765cbc6d HR |
800 | scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *) |
801 | + sizeof(*h) , GFP_KERNEL); | |
802 | if (!scsi_dh_data) { | |
ca9f0089 | 803 | sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n", |
765cbc6d | 804 | RDAC_NAME); |
33af79d1 | 805 | return 0; |
765cbc6d | 806 | } |
33af79d1 | 807 | |
765cbc6d HR |
808 | scsi_dh_data->scsi_dh = &rdac_dh; |
809 | h = (struct rdac_dh_data *) scsi_dh_data->buf; | |
810 | h->lun = UNINITIALIZED_LUN; | |
811 | h->state = RDAC_STATE_ACTIVE; | |
ca9f0089 | 812 | |
1527666e | 813 | err = get_lun_info(sdev, h, array_name); |
ca9f0089 HR |
814 | if (err != SCSI_DH_OK) |
815 | goto failed; | |
816 | ||
1527666e | 817 | err = initialize_controller(sdev, h, array_name); |
ca9f0089 HR |
818 | if (err != SCSI_DH_OK) |
819 | goto failed; | |
820 | ||
87b79a53 MB |
821 | err = check_ownership(sdev, h); |
822 | if (err != SCSI_DH_OK) | |
823 | goto clean_ctlr; | |
824 | ||
825 | err = set_mode_select(sdev, h); | |
826 | if (err != SCSI_DH_OK) | |
827 | goto clean_ctlr; | |
828 | ||
ca9f0089 | 829 | if (!try_module_get(THIS_MODULE)) |
87b79a53 | 830 | goto clean_ctlr; |
ca9f0089 | 831 | |
765cbc6d HR |
832 | spin_lock_irqsave(sdev->request_queue->queue_lock, flags); |
833 | sdev->scsi_dh_data = scsi_dh_data; | |
834 | spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); | |
fbd7ab3e | 835 | |
ca9f0089 HR |
836 | sdev_printk(KERN_NOTICE, sdev, |
837 | "%s: LUN %d (%s)\n", | |
838 | RDAC_NAME, h->lun, lun_state[(int)h->lun_state]); | |
fbd7ab3e | 839 | |
fbd7ab3e | 840 | return 0; |
ca9f0089 | 841 | |
87b79a53 MB |
842 | clean_ctlr: |
843 | kref_put(&h->ctlr->kref, release_controller); | |
844 | ||
ca9f0089 HR |
845 | failed: |
846 | kfree(scsi_dh_data); | |
847 | sdev_printk(KERN_ERR, sdev, "%s: not attached\n", | |
848 | RDAC_NAME); | |
849 | return -EINVAL; | |
fbd7ab3e CS |
850 | } |
851 | ||
765cbc6d HR |
852 | static void rdac_bus_detach( struct scsi_device *sdev ) |
853 | { | |
854 | struct scsi_dh_data *scsi_dh_data; | |
855 | struct rdac_dh_data *h; | |
856 | unsigned long flags; | |
857 | ||
858 | spin_lock_irqsave(sdev->request_queue->queue_lock, flags); | |
859 | scsi_dh_data = sdev->scsi_dh_data; | |
860 | sdev->scsi_dh_data = NULL; | |
861 | spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); | |
862 | ||
863 | h = (struct rdac_dh_data *) scsi_dh_data->buf; | |
864 | if (h->ctlr) | |
865 | kref_put(&h->ctlr->kref, release_controller); | |
866 | kfree(scsi_dh_data); | |
867 | module_put(THIS_MODULE); | |
ca9f0089 | 868 | sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME); |
765cbc6d HR |
869 | } |
870 | ||
871 | ||
872 | ||
fbd7ab3e CS |
873 | static int __init rdac_init(void) |
874 | { | |
875 | int r; | |
876 | ||
877 | r = scsi_register_device_handler(&rdac_dh); | |
970f3f47 | 878 | if (r != 0) { |
fbd7ab3e | 879 | printk(KERN_ERR "Failed to register scsi device handler."); |
970f3f47 CS |
880 | goto done; |
881 | } | |
882 | ||
883 | /* | |
884 | * Create workqueue to handle mode selects for rdac | |
885 | */ | |
886 | kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd"); | |
887 | if (!kmpath_rdacd) { | |
888 | scsi_unregister_device_handler(&rdac_dh); | |
889 | printk(KERN_ERR "kmpath_rdacd creation failed.\n"); | |
890 | } | |
891 | done: | |
fbd7ab3e CS |
892 | return r; |
893 | } | |
894 | ||
895 | static void __exit rdac_exit(void) | |
896 | { | |
970f3f47 | 897 | destroy_workqueue(kmpath_rdacd); |
fbd7ab3e CS |
898 | scsi_unregister_device_handler(&rdac_dh); |
899 | } | |
900 | ||
901 | module_init(rdac_init); | |
902 | module_exit(rdac_exit); | |
903 | ||
904 | MODULE_DESCRIPTION("Multipath LSI/Engenio RDAC driver"); | |
905 | MODULE_AUTHOR("Mike Christie, Chandra Seetharaman"); | |
906 | MODULE_LICENSE("GPL"); |