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fbd7ab3e | 1 | /* |
5f7a6433 | 2 | * LSI/Engenio/NetApp E-Series RDAC SCSI Device Handler |
fbd7ab3e CS |
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> |
acf3368f | 27 | #include <linux/module.h> |
fbd7ab3e CS |
28 | |
29 | #define RDAC_NAME "rdac" | |
c85f8cb9 | 30 | #define RDAC_RETRY_COUNT 5 |
fbd7ab3e CS |
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 | */ | |
497888cf | 39 | #define RDAC_QUIESCENCE_TIME 20 |
fbd7ab3e CS |
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 | |
1527666e | 118 | #define ARRAY_LABEL_LEN 31 |
fbd7ab3e CS |
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 | ||
a53becc9 | 132 | #define UNIQUE_ID_LEN 16 |
fbd7ab3e CS |
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; | |
a53becc9 | 145 | u8 array_unique_id[UNIQUE_ID_LEN]; |
fbd7ab3e CS |
146 | u8 array_user_label_len; |
147 | u8 array_user_label[60]; | |
148 | u8 lun[8]; | |
149 | }; | |
150 | ||
a53becc9 CS |
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]; | |
d6857595 | 162 | struct Scsi_Host *host; |
a53becc9 CS |
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 | }; | |
169 | ||
fbd7ab3e CS |
170 | struct c2_inquiry { |
171 | u8 peripheral_info; | |
172 | u8 page_code; /* 0xC2 */ | |
173 | u8 reserved1; | |
174 | u8 page_len; | |
175 | u8 page_id[4]; /* "swr4" */ | |
176 | u8 sw_version[3]; | |
177 | u8 sw_date[3]; | |
178 | u8 features_enabled; | |
179 | u8 max_lun_supported; | |
180 | u8 partitions[239]; /* Total allocation length should be 0xFF */ | |
181 | }; | |
182 | ||
183 | struct rdac_dh_data { | |
184 | struct rdac_controller *ctlr; | |
185 | #define UNINITIALIZED_LUN (1 << 8) | |
186 | unsigned lun; | |
eebe9b96 MB |
187 | |
188 | #define RDAC_MODE 0 | |
189 | #define RDAC_MODE_AVT 1 | |
190 | #define RDAC_MODE_IOSHIP 2 | |
191 | unsigned char mode; | |
192 | ||
fbd7ab3e CS |
193 | #define RDAC_STATE_ACTIVE 0 |
194 | #define RDAC_STATE_PASSIVE 1 | |
195 | unsigned char state; | |
ca9f0089 HR |
196 | |
197 | #define RDAC_LUN_UNOWNED 0 | |
198 | #define RDAC_LUN_OWNED 1 | |
ca9f0089 | 199 | char lun_state; |
eebe9b96 MB |
200 | |
201 | #define RDAC_PREFERRED 0 | |
202 | #define RDAC_NON_PREFERRED 1 | |
203 | char preferred; | |
204 | ||
fbd7ab3e CS |
205 | unsigned char sense[SCSI_SENSE_BUFFERSIZE]; |
206 | union { | |
207 | struct c2_inquiry c2; | |
208 | struct c4_inquiry c4; | |
209 | struct c8_inquiry c8; | |
210 | struct c9_inquiry c9; | |
211 | } inq; | |
212 | }; | |
213 | ||
eebe9b96 MB |
214 | static const char *mode[] = { |
215 | "RDAC", | |
216 | "AVT", | |
217 | "IOSHIP", | |
218 | }; | |
ca9f0089 HR |
219 | static const char *lun_state[] = |
220 | { | |
221 | "unowned", | |
222 | "owned", | |
ca9f0089 HR |
223 | }; |
224 | ||
970f3f47 CS |
225 | struct rdac_queue_data { |
226 | struct list_head entry; | |
227 | struct rdac_dh_data *h; | |
228 | activate_complete callback_fn; | |
229 | void *callback_data; | |
230 | }; | |
231 | ||
fbd7ab3e CS |
232 | static LIST_HEAD(ctlr_list); |
233 | static DEFINE_SPINLOCK(list_lock); | |
970f3f47 CS |
234 | static struct workqueue_struct *kmpath_rdacd; |
235 | static void send_mode_select(struct work_struct *work); | |
fbd7ab3e | 236 | |
dd784edc MB |
237 | /* |
238 | * module parameter to enable rdac debug logging. | |
239 | * 2 bits for each type of logging, only two types defined for now | |
240 | * Can be enhanced if required at later point | |
241 | */ | |
242 | static int rdac_logging = 1; | |
243 | module_param(rdac_logging, int, S_IRUGO|S_IWUSR); | |
244 | MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, " | |
245 | "Default is 1 - failover logging enabled, " | |
246 | "set it to 0xF to enable all the logs"); | |
247 | ||
248 | #define RDAC_LOG_FAILOVER 0 | |
249 | #define RDAC_LOG_SENSE 2 | |
250 | ||
251 | #define RDAC_LOG_BITS 2 | |
252 | ||
253 | #define RDAC_LOG_LEVEL(SHIFT) \ | |
254 | ((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1)) | |
255 | ||
256 | #define RDAC_LOG(SHIFT, sdev, f, arg...) \ | |
257 | do { \ | |
258 | if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \ | |
259 | sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \ | |
260 | } while (0); | |
261 | ||
fbd7ab3e CS |
262 | static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev) |
263 | { | |
264 | struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data; | |
265 | BUG_ON(scsi_dh_data == NULL); | |
266 | return ((struct rdac_dh_data *) scsi_dh_data->buf); | |
267 | } | |
268 | ||
269 | static struct request *get_rdac_req(struct scsi_device *sdev, | |
270 | void *buffer, unsigned buflen, int rw) | |
271 | { | |
272 | struct request *rq; | |
273 | struct request_queue *q = sdev->request_queue; | |
fbd7ab3e | 274 | |
ca9f0089 | 275 | rq = blk_get_request(q, rw, GFP_NOIO); |
fbd7ab3e CS |
276 | |
277 | if (!rq) { | |
278 | sdev_printk(KERN_INFO, sdev, | |
279 | "get_rdac_req: blk_get_request failed.\n"); | |
280 | return NULL; | |
281 | } | |
282 | ||
ca9f0089 | 283 | if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) { |
fbd7ab3e CS |
284 | blk_put_request(rq); |
285 | sdev_printk(KERN_INFO, sdev, | |
286 | "get_rdac_req: blk_rq_map_kern failed.\n"); | |
287 | return NULL; | |
288 | } | |
289 | ||
fbd7ab3e | 290 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
6000a368 MC |
291 | rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | |
292 | REQ_FAILFAST_DRIVER; | |
fbd7ab3e CS |
293 | rq->retries = RDAC_RETRIES; |
294 | rq->timeout = RDAC_TIMEOUT; | |
295 | ||
296 | return rq; | |
297 | } | |
298 | ||
ca9f0089 | 299 | static struct request *rdac_failover_get(struct scsi_device *sdev, |
04b6e153 | 300 | struct rdac_dh_data *h, struct list_head *list) |
fbd7ab3e CS |
301 | { |
302 | struct request *rq; | |
303 | struct rdac_mode_common *common; | |
304 | unsigned data_size; | |
04b6e153 MB |
305 | struct rdac_queue_data *qdata; |
306 | u8 *lun_table; | |
fbd7ab3e CS |
307 | |
308 | if (h->ctlr->use_ms10) { | |
309 | struct rdac_pg_expanded *rdac_pg; | |
310 | ||
311 | data_size = sizeof(struct rdac_pg_expanded); | |
312 | rdac_pg = &h->ctlr->mode_select.expanded; | |
313 | memset(rdac_pg, 0, data_size); | |
314 | common = &rdac_pg->common; | |
315 | rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40; | |
316 | rdac_pg->subpage_code = 0x1; | |
317 | rdac_pg->page_len[0] = 0x01; | |
318 | rdac_pg->page_len[1] = 0x28; | |
04b6e153 | 319 | lun_table = rdac_pg->lun_table; |
fbd7ab3e CS |
320 | } else { |
321 | struct rdac_pg_legacy *rdac_pg; | |
322 | ||
323 | data_size = sizeof(struct rdac_pg_legacy); | |
324 | rdac_pg = &h->ctlr->mode_select.legacy; | |
325 | memset(rdac_pg, 0, data_size); | |
326 | common = &rdac_pg->common; | |
327 | rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER; | |
328 | rdac_pg->page_len = 0x68; | |
04b6e153 | 329 | lun_table = rdac_pg->lun_table; |
fbd7ab3e CS |
330 | } |
331 | common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS; | |
332 | common->quiescence_timeout = RDAC_QUIESCENCE_TIME; | |
333 | common->rdac_options = RDAC_FORCED_QUIESENCE; | |
334 | ||
04b6e153 MB |
335 | list_for_each_entry(qdata, list, entry) { |
336 | lun_table[qdata->h->lun] = 0x81; | |
337 | } | |
338 | ||
fbd7ab3e CS |
339 | /* get request for block layer packet command */ |
340 | rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE); | |
341 | if (!rq) | |
342 | return NULL; | |
343 | ||
344 | /* Prepare the command. */ | |
345 | if (h->ctlr->use_ms10) { | |
346 | rq->cmd[0] = MODE_SELECT_10; | |
347 | rq->cmd[7] = data_size >> 8; | |
348 | rq->cmd[8] = data_size & 0xff; | |
349 | } else { | |
350 | rq->cmd[0] = MODE_SELECT; | |
351 | rq->cmd[4] = data_size; | |
352 | } | |
353 | rq->cmd_len = COMMAND_SIZE(rq->cmd[0]); | |
354 | ||
ca9f0089 HR |
355 | rq->sense = h->sense; |
356 | memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); | |
357 | rq->sense_len = 0; | |
358 | ||
fbd7ab3e CS |
359 | return rq; |
360 | } | |
361 | ||
362 | static void release_controller(struct kref *kref) | |
363 | { | |
364 | struct rdac_controller *ctlr; | |
365 | ctlr = container_of(kref, struct rdac_controller, kref); | |
366 | ||
970f3f47 | 367 | flush_workqueue(kmpath_rdacd); |
fbd7ab3e CS |
368 | spin_lock(&list_lock); |
369 | list_del(&ctlr->node); | |
370 | spin_unlock(&list_lock); | |
371 | kfree(ctlr); | |
372 | } | |
373 | ||
a53becc9 | 374 | static struct rdac_controller *get_controller(int index, char *array_name, |
d6857595 | 375 | u8 *array_id, struct scsi_device *sdev) |
fbd7ab3e CS |
376 | { |
377 | struct rdac_controller *ctlr, *tmp; | |
378 | ||
379 | spin_lock(&list_lock); | |
380 | ||
381 | list_for_each_entry(tmp, &ctlr_list, node) { | |
a53becc9 | 382 | if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) && |
d6857595 CS |
383 | (tmp->index == index) && |
384 | (tmp->host == sdev->host)) { | |
fbd7ab3e CS |
385 | kref_get(&tmp->kref); |
386 | spin_unlock(&list_lock); | |
387 | return tmp; | |
388 | } | |
389 | } | |
390 | ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC); | |
391 | if (!ctlr) | |
392 | goto done; | |
393 | ||
394 | /* initialize fields of controller */ | |
a53becc9 CS |
395 | memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN); |
396 | ctlr->index = index; | |
d6857595 | 397 | ctlr->host = sdev->host; |
1527666e MB |
398 | memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN); |
399 | ||
fbd7ab3e CS |
400 | kref_init(&ctlr->kref); |
401 | ctlr->use_ms10 = -1; | |
970f3f47 CS |
402 | ctlr->ms_queued = 0; |
403 | ctlr->ms_sdev = NULL; | |
404 | spin_lock_init(&ctlr->ms_lock); | |
405 | INIT_WORK(&ctlr->ms_work, send_mode_select); | |
406 | INIT_LIST_HEAD(&ctlr->ms_head); | |
fbd7ab3e CS |
407 | list_add(&ctlr->node, &ctlr_list); |
408 | done: | |
409 | spin_unlock(&list_lock); | |
410 | return ctlr; | |
411 | } | |
412 | ||
413 | static int submit_inquiry(struct scsi_device *sdev, int page_code, | |
ca9f0089 | 414 | unsigned int len, struct rdac_dh_data *h) |
fbd7ab3e CS |
415 | { |
416 | struct request *rq; | |
417 | struct request_queue *q = sdev->request_queue; | |
fbd7ab3e CS |
418 | int err = SCSI_DH_RES_TEMP_UNAVAIL; |
419 | ||
420 | rq = get_rdac_req(sdev, &h->inq, len, READ); | |
421 | if (!rq) | |
422 | goto done; | |
423 | ||
424 | /* Prepare the command. */ | |
425 | rq->cmd[0] = INQUIRY; | |
426 | rq->cmd[1] = 1; | |
427 | rq->cmd[2] = page_code; | |
428 | rq->cmd[4] = len; | |
429 | rq->cmd_len = COMMAND_SIZE(INQUIRY); | |
ca9f0089 HR |
430 | |
431 | rq->sense = h->sense; | |
432 | memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); | |
433 | rq->sense_len = 0; | |
434 | ||
fbd7ab3e CS |
435 | err = blk_execute_rq(q, NULL, rq, 1); |
436 | if (err == -EIO) | |
437 | err = SCSI_DH_IO; | |
ca9f0089 HR |
438 | |
439 | blk_put_request(rq); | |
fbd7ab3e CS |
440 | done: |
441 | return err; | |
442 | } | |
443 | ||
1527666e | 444 | static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h, |
a53becc9 | 445 | char *array_name, u8 *array_id) |
fbd7ab3e | 446 | { |
1527666e | 447 | int err, i; |
fbd7ab3e | 448 | struct c8_inquiry *inqp; |
fbd7ab3e | 449 | |
ca9f0089 | 450 | err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h); |
fbd7ab3e CS |
451 | if (err == SCSI_DH_OK) { |
452 | inqp = &h->inq.c8; | |
ca9f0089 HR |
453 | if (inqp->page_code != 0xc8) |
454 | return SCSI_DH_NOSYS; | |
455 | if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' || | |
456 | inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd') | |
457 | return SCSI_DH_NOSYS; | |
8479fca1 | 458 | h->lun = inqp->lun[7]; /* Uses only the last byte */ |
1527666e MB |
459 | |
460 | for(i=0; i<ARRAY_LABEL_LEN-1; ++i) | |
461 | *(array_name+i) = inqp->array_user_label[(2*i)+1]; | |
462 | ||
463 | *(array_name+ARRAY_LABEL_LEN-1) = '\0'; | |
a53becc9 CS |
464 | memset(array_id, 0, UNIQUE_ID_LEN); |
465 | memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len); | |
fbd7ab3e CS |
466 | } |
467 | return err; | |
468 | } | |
469 | ||
ca9f0089 | 470 | static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h) |
fbd7ab3e CS |
471 | { |
472 | int err; | |
473 | struct c9_inquiry *inqp; | |
fbd7ab3e | 474 | |
9eece961 | 475 | h->state = RDAC_STATE_ACTIVE; |
ca9f0089 | 476 | err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h); |
fbd7ab3e | 477 | if (err == SCSI_DH_OK) { |
fbd7ab3e | 478 | inqp = &h->inq.c9; |
1c3afc42 MB |
479 | /* detect the operating mode */ |
480 | if ((inqp->avte_cvp >> 5) & 0x1) | |
481 | h->mode = RDAC_MODE_IOSHIP; /* LUN in IOSHIP mode */ | |
482 | else if (inqp->avte_cvp >> 7) | |
483 | h->mode = RDAC_MODE_AVT; /* LUN in AVT mode */ | |
484 | else | |
485 | h->mode = RDAC_MODE; /* LUN in RDAC mode */ | |
486 | ||
487 | /* Update ownership */ | |
488 | if (inqp->avte_cvp & 0x1) | |
ca9f0089 | 489 | h->lun_state = RDAC_LUN_OWNED; |
1c3afc42 MB |
490 | else { |
491 | h->lun_state = RDAC_LUN_UNOWNED; | |
492 | if (h->mode == RDAC_MODE) | |
493 | h->state = RDAC_STATE_PASSIVE; | |
ca9f0089 | 494 | } |
ca9f0089 | 495 | |
1c3afc42 MB |
496 | /* Update path prio*/ |
497 | if (inqp->path_prio & 0x1) | |
498 | h->preferred = RDAC_PREFERRED; | |
499 | else | |
500 | h->preferred = RDAC_NON_PREFERRED; | |
501 | } | |
5a36756b | 502 | |
fbd7ab3e CS |
503 | return err; |
504 | } | |
505 | ||
ca9f0089 | 506 | static int initialize_controller(struct scsi_device *sdev, |
a53becc9 | 507 | struct rdac_dh_data *h, char *array_name, u8 *array_id) |
fbd7ab3e | 508 | { |
a53becc9 | 509 | int err, index; |
fbd7ab3e | 510 | struct c4_inquiry *inqp; |
fbd7ab3e | 511 | |
ca9f0089 | 512 | err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h); |
fbd7ab3e CS |
513 | if (err == SCSI_DH_OK) { |
514 | inqp = &h->inq.c4; | |
a53becc9 CS |
515 | /* get the controller index */ |
516 | if (inqp->slot_id[1] == 0x31) | |
517 | index = 0; | |
518 | else | |
519 | index = 1; | |
d6857595 | 520 | h->ctlr = get_controller(index, array_name, array_id, sdev); |
fbd7ab3e CS |
521 | if (!h->ctlr) |
522 | err = SCSI_DH_RES_TEMP_UNAVAIL; | |
523 | } | |
524 | return err; | |
525 | } | |
526 | ||
ca9f0089 | 527 | static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h) |
fbd7ab3e CS |
528 | { |
529 | int err; | |
530 | struct c2_inquiry *inqp; | |
fbd7ab3e | 531 | |
ca9f0089 | 532 | err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h); |
fbd7ab3e CS |
533 | if (err == SCSI_DH_OK) { |
534 | inqp = &h->inq.c2; | |
535 | /* | |
536 | * If more than MODE6_MAX_LUN luns are supported, use | |
537 | * mode select 10 | |
538 | */ | |
539 | if (inqp->max_lun_supported >= MODE6_MAX_LUN) | |
540 | h->ctlr->use_ms10 = 1; | |
541 | else | |
542 | h->ctlr->use_ms10 = 0; | |
543 | } | |
544 | return err; | |
545 | } | |
546 | ||
ca9f0089 | 547 | static int mode_select_handle_sense(struct scsi_device *sdev, |
970f3f47 | 548 | unsigned char *sensebuf) |
fbd7ab3e CS |
549 | { |
550 | struct scsi_sense_hdr sense_hdr; | |
7687fb92 | 551 | int err = SCSI_DH_IO, ret; |
dd784edc | 552 | struct rdac_dh_data *h = get_rdac_data(sdev); |
fbd7ab3e | 553 | |
ca9f0089 | 554 | ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr); |
fbd7ab3e CS |
555 | if (!ret) |
556 | goto done; | |
557 | ||
7687fb92 CV |
558 | switch (sense_hdr.sense_key) { |
559 | case NO_SENSE: | |
560 | case ABORTED_COMMAND: | |
561 | case UNIT_ATTENTION: | |
fbd7ab3e | 562 | err = SCSI_DH_RETRY; |
7687fb92 CV |
563 | break; |
564 | case NOT_READY: | |
565 | if (sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x01) | |
566 | /* LUN Not Ready and is in the Process of Becoming | |
567 | * Ready | |
568 | */ | |
569 | err = SCSI_DH_RETRY; | |
570 | break; | |
571 | case ILLEGAL_REQUEST: | |
572 | if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36) | |
573 | /* | |
574 | * Command Lock contention | |
575 | */ | |
576 | err = SCSI_DH_RETRY; | |
577 | break; | |
578 | default: | |
dd784edc | 579 | break; |
fbd7ab3e CS |
580 | } |
581 | ||
dd784edc MB |
582 | RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " |
583 | "MODE_SELECT returned with sense %02x/%02x/%02x", | |
584 | (char *) h->ctlr->array_name, h->ctlr->index, | |
585 | sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq); | |
586 | ||
fbd7ab3e CS |
587 | done: |
588 | return err; | |
589 | } | |
590 | ||
970f3f47 | 591 | static void send_mode_select(struct work_struct *work) |
fbd7ab3e | 592 | { |
970f3f47 CS |
593 | struct rdac_controller *ctlr = |
594 | container_of(work, struct rdac_controller, ms_work); | |
fbd7ab3e | 595 | struct request *rq; |
970f3f47 CS |
596 | struct scsi_device *sdev = ctlr->ms_sdev; |
597 | struct rdac_dh_data *h = get_rdac_data(sdev); | |
fbd7ab3e | 598 | struct request_queue *q = sdev->request_queue; |
c85f8cb9 | 599 | int err, retry_cnt = RDAC_RETRY_COUNT; |
970f3f47 CS |
600 | struct rdac_queue_data *tmp, *qdata; |
601 | LIST_HEAD(list); | |
970f3f47 CS |
602 | |
603 | spin_lock(&ctlr->ms_lock); | |
604 | list_splice_init(&ctlr->ms_head, &list); | |
605 | ctlr->ms_queued = 0; | |
606 | ctlr->ms_sdev = NULL; | |
607 | spin_unlock(&ctlr->ms_lock); | |
608 | ||
c85f8cb9 CS |
609 | retry: |
610 | err = SCSI_DH_RES_TEMP_UNAVAIL; | |
04b6e153 | 611 | rq = rdac_failover_get(sdev, h, &list); |
fbd7ab3e CS |
612 | if (!rq) |
613 | goto done; | |
614 | ||
dd784edc MB |
615 | RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " |
616 | "%s MODE_SELECT command", | |
617 | (char *) h->ctlr->array_name, h->ctlr->index, | |
c85f8cb9 | 618 | (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying"); |
fbd7ab3e CS |
619 | |
620 | err = blk_execute_rq(q, NULL, rq, 1); | |
c85f8cb9 CS |
621 | blk_put_request(rq); |
622 | if (err != SCSI_DH_OK) { | |
ca9f0089 | 623 | err = mode_select_handle_sense(sdev, h->sense); |
c85f8cb9 CS |
624 | if (err == SCSI_DH_RETRY && retry_cnt--) |
625 | goto retry; | |
626 | } | |
dd784edc | 627 | if (err == SCSI_DH_OK) { |
fbd7ab3e | 628 | h->state = RDAC_STATE_ACTIVE; |
dd784edc MB |
629 | RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " |
630 | "MODE_SELECT completed", | |
631 | (char *) h->ctlr->array_name, h->ctlr->index); | |
632 | } | |
ca9f0089 | 633 | |
fbd7ab3e | 634 | done: |
970f3f47 CS |
635 | list_for_each_entry_safe(qdata, tmp, &list, entry) { |
636 | list_del(&qdata->entry); | |
637 | if (err == SCSI_DH_OK) | |
638 | qdata->h->state = RDAC_STATE_ACTIVE; | |
639 | if (qdata->callback_fn) | |
640 | qdata->callback_fn(qdata->callback_data, err); | |
641 | kfree(qdata); | |
642 | } | |
643 | return; | |
644 | } | |
645 | ||
646 | static int queue_mode_select(struct scsi_device *sdev, | |
647 | activate_complete fn, void *data) | |
648 | { | |
649 | struct rdac_queue_data *qdata; | |
650 | struct rdac_controller *ctlr; | |
651 | ||
652 | qdata = kzalloc(sizeof(*qdata), GFP_KERNEL); | |
653 | if (!qdata) | |
654 | return SCSI_DH_RETRY; | |
655 | ||
656 | qdata->h = get_rdac_data(sdev); | |
657 | qdata->callback_fn = fn; | |
658 | qdata->callback_data = data; | |
659 | ||
660 | ctlr = qdata->h->ctlr; | |
661 | spin_lock(&ctlr->ms_lock); | |
662 | list_add_tail(&qdata->entry, &ctlr->ms_head); | |
663 | if (!ctlr->ms_queued) { | |
664 | ctlr->ms_queued = 1; | |
665 | ctlr->ms_sdev = sdev; | |
666 | queue_work(kmpath_rdacd, &ctlr->ms_work); | |
667 | } | |
668 | spin_unlock(&ctlr->ms_lock); | |
669 | return SCSI_DH_OK; | |
fbd7ab3e CS |
670 | } |
671 | ||
3ae31f6a CS |
672 | static int rdac_activate(struct scsi_device *sdev, |
673 | activate_complete fn, void *data) | |
fbd7ab3e CS |
674 | { |
675 | struct rdac_dh_data *h = get_rdac_data(sdev); | |
676 | int err = SCSI_DH_OK; | |
3425fbfe | 677 | int act = 0; |
fbd7ab3e | 678 | |
ca9f0089 HR |
679 | err = check_ownership(sdev, h); |
680 | if (err != SCSI_DH_OK) | |
fbd7ab3e | 681 | goto done; |
fbd7ab3e | 682 | |
3425fbfe MB |
683 | switch (h->mode) { |
684 | case RDAC_MODE: | |
685 | if (h->lun_state == RDAC_LUN_UNOWNED) | |
686 | act = 1; | |
687 | break; | |
688 | case RDAC_MODE_IOSHIP: | |
689 | if ((h->lun_state == RDAC_LUN_UNOWNED) && | |
690 | (h->preferred == RDAC_PREFERRED)) | |
691 | act = 1; | |
692 | break; | |
693 | default: | |
694 | break; | |
695 | } | |
696 | ||
697 | if (act) { | |
970f3f47 CS |
698 | err = queue_mode_select(sdev, fn, data); |
699 | if (err == SCSI_DH_OK) | |
700 | return 0; | |
701 | } | |
fbd7ab3e | 702 | done: |
3ae31f6a CS |
703 | if (fn) |
704 | fn(data, err); | |
705 | return 0; | |
fbd7ab3e CS |
706 | } |
707 | ||
708 | static int rdac_prep_fn(struct scsi_device *sdev, struct request *req) | |
709 | { | |
710 | struct rdac_dh_data *h = get_rdac_data(sdev); | |
711 | int ret = BLKPREP_OK; | |
712 | ||
713 | if (h->state != RDAC_STATE_ACTIVE) { | |
714 | ret = BLKPREP_KILL; | |
715 | req->cmd_flags |= REQ_QUIET; | |
716 | } | |
717 | return ret; | |
718 | ||
719 | } | |
720 | ||
721 | static int rdac_check_sense(struct scsi_device *sdev, | |
722 | struct scsi_sense_hdr *sense_hdr) | |
723 | { | |
724 | struct rdac_dh_data *h = get_rdac_data(sdev); | |
dd784edc MB |
725 | |
726 | RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, " | |
727 | "I/O returned with sense %02x/%02x/%02x", | |
728 | (char *) h->ctlr->array_name, h->ctlr->index, | |
729 | sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq); | |
730 | ||
fbd7ab3e CS |
731 | switch (sense_hdr->sense_key) { |
732 | case NOT_READY: | |
8f032263 CV |
733 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01) |
734 | /* LUN Not Ready - Logical Unit Not Ready and is in | |
735 | * the process of becoming ready | |
736 | * Just retry. | |
737 | */ | |
738 | return ADD_TO_MLQUEUE; | |
fbd7ab3e CS |
739 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81) |
740 | /* LUN Not Ready - Storage firmware incompatible | |
741 | * Manual code synchonisation required. | |
742 | * | |
743 | * Nothing we can do here. Try to bypass the path. | |
744 | */ | |
745 | return SUCCESS; | |
746 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1) | |
747 | /* LUN Not Ready - Quiescense in progress | |
748 | * | |
749 | * Just retry and wait. | |
750 | */ | |
c7dbb627 | 751 | return ADD_TO_MLQUEUE; |
af50bb99 CV |
752 | if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02) |
753 | /* LUN Not Ready - Quiescense in progress | |
754 | * or has been achieved | |
755 | * Just retry. | |
756 | */ | |
757 | return ADD_TO_MLQUEUE; | |
fbd7ab3e CS |
758 | break; |
759 | case ILLEGAL_REQUEST: | |
760 | if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) { | |
761 | /* Invalid Request - Current Logical Unit Ownership. | |
762 | * Controller is not the current owner of the LUN, | |
763 | * Fail the path, so that the other path be used. | |
764 | */ | |
765 | h->state = RDAC_STATE_PASSIVE; | |
766 | return SUCCESS; | |
767 | } | |
768 | break; | |
769 | case UNIT_ATTENTION: | |
770 | if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00) | |
771 | /* | |
772 | * Power On, Reset, or Bus Device Reset, just retry. | |
ea41e415 CV |
773 | */ |
774 | return ADD_TO_MLQUEUE; | |
775 | if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02) | |
776 | /* | |
777 | * Quiescence in progress , just retry. | |
fbd7ab3e | 778 | */ |
c7dbb627 | 779 | return ADD_TO_MLQUEUE; |
fbd7ab3e CS |
780 | break; |
781 | } | |
782 | /* success just means we do not care what scsi-ml does */ | |
783 | return SCSI_RETURN_NOT_HANDLED; | |
784 | } | |
785 | ||
f08c0761 | 786 | static const struct scsi_dh_devlist rdac_dev_list[] = { |
fbd7ab3e CS |
787 | {"IBM", "1722"}, |
788 | {"IBM", "1724"}, | |
789 | {"IBM", "1726"}, | |
790 | {"IBM", "1742"}, | |
6f4fdda4 MB |
791 | {"IBM", "1745"}, |
792 | {"IBM", "1746"}, | |
fbd7ab3e CS |
793 | {"IBM", "1814"}, |
794 | {"IBM", "1815"}, | |
795 | {"IBM", "1818"}, | |
796 | {"IBM", "3526"}, | |
797 | {"SGI", "TP9400"}, | |
798 | {"SGI", "TP9500"}, | |
66195fc9 | 799 | {"SGI", "TP9700"}, |
fbd7ab3e CS |
800 | {"SGI", "IS"}, |
801 | {"STK", "OPENstorage D280"}, | |
802 | {"SUN", "CSM200_R"}, | |
5bab0885 CB |
803 | {"SUN", "LCSM100_I"}, |
804 | {"SUN", "LCSM100_S"}, | |
805 | {"SUN", "LCSM100_E"}, | |
fbd7ab3e | 806 | {"SUN", "LCSM100_F"}, |
650849d7 YD |
807 | {"DELL", "MD3000"}, |
808 | {"DELL", "MD3000i"}, | |
cdf69bb9 YD |
809 | {"DELL", "MD32xx"}, |
810 | {"DELL", "MD32xxi"}, | |
2cf75f1c | 811 | {"DELL", "MD36xxi"}, |
bc898c97 | 812 | {"DELL", "MD36xxf"}, |
273c4781 BM |
813 | {"LSI", "INF-01-00"}, |
814 | {"ENGENIO", "INF-01-00"}, | |
4dbfb544 CS |
815 | {"STK", "FLEXLINE 380"}, |
816 | {"SUN", "CSM100_R_FC"}, | |
15660676 CV |
817 | {"SUN", "STK6580_6780"}, |
818 | {"SUN", "SUN_6180"}, | |
66195fc9 | 819 | {"SUN", "ArrayStorage"}, |
fbd7ab3e CS |
820 | {NULL, NULL}, |
821 | }; | |
822 | ||
bee89eae MB |
823 | static bool rdac_match(struct scsi_device *sdev) |
824 | { | |
825 | int i; | |
826 | ||
827 | if (scsi_device_tpgs(sdev)) | |
828 | return false; | |
829 | ||
830 | for (i = 0; rdac_dev_list[i].vendor; i++) { | |
831 | if (!strncmp(sdev->vendor, rdac_dev_list[i].vendor, | |
832 | strlen(rdac_dev_list[i].vendor)) && | |
833 | !strncmp(sdev->model, rdac_dev_list[i].model, | |
834 | strlen(rdac_dev_list[i].model))) { | |
835 | return true; | |
836 | } | |
837 | } | |
838 | return false; | |
839 | } | |
840 | ||
765cbc6d HR |
841 | static int rdac_bus_attach(struct scsi_device *sdev); |
842 | static void rdac_bus_detach(struct scsi_device *sdev); | |
fbd7ab3e CS |
843 | |
844 | static struct scsi_device_handler rdac_dh = { | |
845 | .name = RDAC_NAME, | |
846 | .module = THIS_MODULE, | |
765cbc6d | 847 | .devlist = rdac_dev_list, |
fbd7ab3e CS |
848 | .prep_fn = rdac_prep_fn, |
849 | .check_sense = rdac_check_sense, | |
765cbc6d HR |
850 | .attach = rdac_bus_attach, |
851 | .detach = rdac_bus_detach, | |
fbd7ab3e | 852 | .activate = rdac_activate, |
bee89eae | 853 | .match = rdac_match, |
fbd7ab3e CS |
854 | }; |
855 | ||
765cbc6d | 856 | static int rdac_bus_attach(struct scsi_device *sdev) |
fbd7ab3e | 857 | { |
fbd7ab3e CS |
858 | struct scsi_dh_data *scsi_dh_data; |
859 | struct rdac_dh_data *h; | |
fbd7ab3e | 860 | unsigned long flags; |
ca9f0089 | 861 | int err; |
1527666e | 862 | char array_name[ARRAY_LABEL_LEN]; |
a53becc9 | 863 | char array_id[UNIQUE_ID_LEN]; |
fbd7ab3e | 864 | |
9dfeb315 | 865 | scsi_dh_data = kzalloc(sizeof(*scsi_dh_data) |
765cbc6d HR |
866 | + sizeof(*h) , GFP_KERNEL); |
867 | if (!scsi_dh_data) { | |
ca9f0089 | 868 | sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n", |
765cbc6d | 869 | RDAC_NAME); |
33af79d1 | 870 | return 0; |
765cbc6d | 871 | } |
33af79d1 | 872 | |
765cbc6d HR |
873 | scsi_dh_data->scsi_dh = &rdac_dh; |
874 | h = (struct rdac_dh_data *) scsi_dh_data->buf; | |
875 | h->lun = UNINITIALIZED_LUN; | |
876 | h->state = RDAC_STATE_ACTIVE; | |
ca9f0089 | 877 | |
a53becc9 | 878 | err = get_lun_info(sdev, h, array_name, array_id); |
ca9f0089 HR |
879 | if (err != SCSI_DH_OK) |
880 | goto failed; | |
881 | ||
a53becc9 | 882 | err = initialize_controller(sdev, h, array_name, array_id); |
ca9f0089 HR |
883 | if (err != SCSI_DH_OK) |
884 | goto failed; | |
885 | ||
87b79a53 MB |
886 | err = check_ownership(sdev, h); |
887 | if (err != SCSI_DH_OK) | |
888 | goto clean_ctlr; | |
889 | ||
890 | err = set_mode_select(sdev, h); | |
891 | if (err != SCSI_DH_OK) | |
892 | goto clean_ctlr; | |
893 | ||
ca9f0089 | 894 | if (!try_module_get(THIS_MODULE)) |
87b79a53 | 895 | goto clean_ctlr; |
ca9f0089 | 896 | |
765cbc6d HR |
897 | spin_lock_irqsave(sdev->request_queue->queue_lock, flags); |
898 | sdev->scsi_dh_data = scsi_dh_data; | |
899 | spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); | |
fbd7ab3e | 900 | |
ca9f0089 | 901 | sdev_printk(KERN_NOTICE, sdev, |
eebe9b96 MB |
902 | "%s: LUN %d (%s) (%s)\n", |
903 | RDAC_NAME, h->lun, mode[(int)h->mode], | |
904 | lun_state[(int)h->lun_state]); | |
fbd7ab3e | 905 | |
fbd7ab3e | 906 | return 0; |
ca9f0089 | 907 | |
87b79a53 MB |
908 | clean_ctlr: |
909 | kref_put(&h->ctlr->kref, release_controller); | |
910 | ||
ca9f0089 HR |
911 | failed: |
912 | kfree(scsi_dh_data); | |
913 | sdev_printk(KERN_ERR, sdev, "%s: not attached\n", | |
914 | RDAC_NAME); | |
915 | return -EINVAL; | |
fbd7ab3e CS |
916 | } |
917 | ||
765cbc6d HR |
918 | static void rdac_bus_detach( struct scsi_device *sdev ) |
919 | { | |
920 | struct scsi_dh_data *scsi_dh_data; | |
921 | struct rdac_dh_data *h; | |
922 | unsigned long flags; | |
923 | ||
924 | spin_lock_irqsave(sdev->request_queue->queue_lock, flags); | |
925 | scsi_dh_data = sdev->scsi_dh_data; | |
926 | sdev->scsi_dh_data = NULL; | |
927 | spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); | |
928 | ||
929 | h = (struct rdac_dh_data *) scsi_dh_data->buf; | |
930 | if (h->ctlr) | |
931 | kref_put(&h->ctlr->kref, release_controller); | |
932 | kfree(scsi_dh_data); | |
933 | module_put(THIS_MODULE); | |
ca9f0089 | 934 | sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME); |
765cbc6d HR |
935 | } |
936 | ||
937 | ||
938 | ||
fbd7ab3e CS |
939 | static int __init rdac_init(void) |
940 | { | |
941 | int r; | |
942 | ||
943 | r = scsi_register_device_handler(&rdac_dh); | |
970f3f47 | 944 | if (r != 0) { |
fbd7ab3e | 945 | printk(KERN_ERR "Failed to register scsi device handler."); |
970f3f47 CS |
946 | goto done; |
947 | } | |
948 | ||
949 | /* | |
950 | * Create workqueue to handle mode selects for rdac | |
951 | */ | |
952 | kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd"); | |
953 | if (!kmpath_rdacd) { | |
954 | scsi_unregister_device_handler(&rdac_dh); | |
955 | printk(KERN_ERR "kmpath_rdacd creation failed.\n"); | |
956 | } | |
957 | done: | |
fbd7ab3e CS |
958 | return r; |
959 | } | |
960 | ||
961 | static void __exit rdac_exit(void) | |
962 | { | |
970f3f47 | 963 | destroy_workqueue(kmpath_rdacd); |
fbd7ab3e CS |
964 | scsi_unregister_device_handler(&rdac_dh); |
965 | } | |
966 | ||
967 | module_init(rdac_init); | |
968 | module_exit(rdac_exit); | |
969 | ||
5f7a6433 | 970 | MODULE_DESCRIPTION("Multipath LSI/Engenio/NetApp E-Series RDAC driver"); |
fbd7ab3e | 971 | MODULE_AUTHOR("Mike Christie, Chandra Seetharaman"); |
a0b990c6 | 972 | MODULE_VERSION("01.00.0000.0000"); |
fbd7ab3e | 973 | MODULE_LICENSE("GPL"); |