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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; | |
1a5dc166 | 168 | struct list_head dh_list; |
a53becc9 CS |
169 | }; |
170 | ||
fbd7ab3e CS |
171 | struct c2_inquiry { |
172 | u8 peripheral_info; | |
173 | u8 page_code; /* 0xC2 */ | |
174 | u8 reserved1; | |
175 | u8 page_len; | |
176 | u8 page_id[4]; /* "swr4" */ | |
177 | u8 sw_version[3]; | |
178 | u8 sw_date[3]; | |
179 | u8 features_enabled; | |
180 | u8 max_lun_supported; | |
181 | u8 partitions[239]; /* Total allocation length should be 0xFF */ | |
182 | }; | |
183 | ||
184 | struct rdac_dh_data { | |
1a5dc166 | 185 | struct list_head node; |
fbd7ab3e | 186 | struct rdac_controller *ctlr; |
1a5dc166 | 187 | struct scsi_device *sdev; |
fbd7ab3e CS |
188 | #define UNINITIALIZED_LUN (1 << 8) |
189 | unsigned lun; | |
eebe9b96 MB |
190 | |
191 | #define RDAC_MODE 0 | |
192 | #define RDAC_MODE_AVT 1 | |
193 | #define RDAC_MODE_IOSHIP 2 | |
194 | unsigned char mode; | |
195 | ||
fbd7ab3e CS |
196 | #define RDAC_STATE_ACTIVE 0 |
197 | #define RDAC_STATE_PASSIVE 1 | |
198 | unsigned char state; | |
ca9f0089 HR |
199 | |
200 | #define RDAC_LUN_UNOWNED 0 | |
201 | #define RDAC_LUN_OWNED 1 | |
ca9f0089 | 202 | char lun_state; |
eebe9b96 MB |
203 | |
204 | #define RDAC_PREFERRED 0 | |
205 | #define RDAC_NON_PREFERRED 1 | |
206 | char preferred; | |
207 | ||
fbd7ab3e CS |
208 | unsigned char sense[SCSI_SENSE_BUFFERSIZE]; |
209 | union { | |
210 | struct c2_inquiry c2; | |
211 | struct c4_inquiry c4; | |
212 | struct c8_inquiry c8; | |
213 | struct c9_inquiry c9; | |
214 | } inq; | |
215 | }; | |
216 | ||
eebe9b96 MB |
217 | static const char *mode[] = { |
218 | "RDAC", | |
219 | "AVT", | |
220 | "IOSHIP", | |
221 | }; | |
ca9f0089 HR |
222 | static const char *lun_state[] = |
223 | { | |
224 | "unowned", | |
225 | "owned", | |
ca9f0089 HR |
226 | }; |
227 | ||
970f3f47 CS |
228 | struct rdac_queue_data { |
229 | struct list_head entry; | |
230 | struct rdac_dh_data *h; | |
231 | activate_complete callback_fn; | |
232 | void *callback_data; | |
233 | }; | |
234 | ||
fbd7ab3e CS |
235 | static LIST_HEAD(ctlr_list); |
236 | static DEFINE_SPINLOCK(list_lock); | |
970f3f47 CS |
237 | static struct workqueue_struct *kmpath_rdacd; |
238 | static void send_mode_select(struct work_struct *work); | |
fbd7ab3e | 239 | |
dd784edc MB |
240 | /* |
241 | * module parameter to enable rdac debug logging. | |
242 | * 2 bits for each type of logging, only two types defined for now | |
243 | * Can be enhanced if required at later point | |
244 | */ | |
245 | static int rdac_logging = 1; | |
246 | module_param(rdac_logging, int, S_IRUGO|S_IWUSR); | |
247 | MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, " | |
248 | "Default is 1 - failover logging enabled, " | |
249 | "set it to 0xF to enable all the logs"); | |
250 | ||
251 | #define RDAC_LOG_FAILOVER 0 | |
252 | #define RDAC_LOG_SENSE 2 | |
253 | ||
254 | #define RDAC_LOG_BITS 2 | |
255 | ||
256 | #define RDAC_LOG_LEVEL(SHIFT) \ | |
257 | ((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1)) | |
258 | ||
259 | #define RDAC_LOG(SHIFT, sdev, f, arg...) \ | |
260 | do { \ | |
261 | if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \ | |
262 | sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \ | |
263 | } while (0); | |
264 | ||
fbd7ab3e CS |
265 | static struct request *get_rdac_req(struct scsi_device *sdev, |
266 | void *buffer, unsigned buflen, int rw) | |
267 | { | |
268 | struct request *rq; | |
269 | struct request_queue *q = sdev->request_queue; | |
fbd7ab3e | 270 | |
ca9f0089 | 271 | rq = blk_get_request(q, rw, GFP_NOIO); |
fbd7ab3e | 272 | |
a492f075 | 273 | if (IS_ERR(rq)) { |
fbd7ab3e CS |
274 | sdev_printk(KERN_INFO, sdev, |
275 | "get_rdac_req: blk_get_request failed.\n"); | |
276 | return NULL; | |
277 | } | |
f27b087b | 278 | blk_rq_set_block_pc(rq); |
fbd7ab3e | 279 | |
ca9f0089 | 280 | if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) { |
fbd7ab3e CS |
281 | blk_put_request(rq); |
282 | sdev_printk(KERN_INFO, sdev, | |
283 | "get_rdac_req: blk_rq_map_kern failed.\n"); | |
284 | return NULL; | |
285 | } | |
286 | ||
6000a368 MC |
287 | rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | |
288 | REQ_FAILFAST_DRIVER; | |
fbd7ab3e CS |
289 | rq->retries = RDAC_RETRIES; |
290 | rq->timeout = RDAC_TIMEOUT; | |
291 | ||
292 | return rq; | |
293 | } | |
294 | ||
ca9f0089 | 295 | static struct request *rdac_failover_get(struct scsi_device *sdev, |
04b6e153 | 296 | struct rdac_dh_data *h, struct list_head *list) |
fbd7ab3e CS |
297 | { |
298 | struct request *rq; | |
299 | struct rdac_mode_common *common; | |
300 | unsigned data_size; | |
04b6e153 MB |
301 | struct rdac_queue_data *qdata; |
302 | u8 *lun_table; | |
fbd7ab3e CS |
303 | |
304 | if (h->ctlr->use_ms10) { | |
305 | struct rdac_pg_expanded *rdac_pg; | |
306 | ||
307 | data_size = sizeof(struct rdac_pg_expanded); | |
308 | rdac_pg = &h->ctlr->mode_select.expanded; | |
309 | memset(rdac_pg, 0, data_size); | |
310 | common = &rdac_pg->common; | |
311 | rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40; | |
312 | rdac_pg->subpage_code = 0x1; | |
313 | rdac_pg->page_len[0] = 0x01; | |
314 | rdac_pg->page_len[1] = 0x28; | |
04b6e153 | 315 | lun_table = rdac_pg->lun_table; |
fbd7ab3e CS |
316 | } else { |
317 | struct rdac_pg_legacy *rdac_pg; | |
318 | ||
319 | data_size = sizeof(struct rdac_pg_legacy); | |
320 | rdac_pg = &h->ctlr->mode_select.legacy; | |
321 | memset(rdac_pg, 0, data_size); | |
322 | common = &rdac_pg->common; | |
323 | rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER; | |
324 | rdac_pg->page_len = 0x68; | |
04b6e153 | 325 | lun_table = rdac_pg->lun_table; |
fbd7ab3e CS |
326 | } |
327 | common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS; | |
328 | common->quiescence_timeout = RDAC_QUIESCENCE_TIME; | |
329 | common->rdac_options = RDAC_FORCED_QUIESENCE; | |
330 | ||
04b6e153 MB |
331 | list_for_each_entry(qdata, list, entry) { |
332 | lun_table[qdata->h->lun] = 0x81; | |
333 | } | |
334 | ||
fbd7ab3e CS |
335 | /* get request for block layer packet command */ |
336 | rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE); | |
337 | if (!rq) | |
338 | return NULL; | |
339 | ||
340 | /* Prepare the command. */ | |
341 | if (h->ctlr->use_ms10) { | |
342 | rq->cmd[0] = MODE_SELECT_10; | |
343 | rq->cmd[7] = data_size >> 8; | |
344 | rq->cmd[8] = data_size & 0xff; | |
345 | } else { | |
346 | rq->cmd[0] = MODE_SELECT; | |
347 | rq->cmd[4] = data_size; | |
348 | } | |
349 | rq->cmd_len = COMMAND_SIZE(rq->cmd[0]); | |
350 | ||
ca9f0089 HR |
351 | rq->sense = h->sense; |
352 | memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); | |
353 | rq->sense_len = 0; | |
354 | ||
fbd7ab3e CS |
355 | return rq; |
356 | } | |
357 | ||
358 | static void release_controller(struct kref *kref) | |
359 | { | |
360 | struct rdac_controller *ctlr; | |
361 | ctlr = container_of(kref, struct rdac_controller, kref); | |
362 | ||
fbd7ab3e | 363 | list_del(&ctlr->node); |
fbd7ab3e CS |
364 | kfree(ctlr); |
365 | } | |
366 | ||
a53becc9 | 367 | static struct rdac_controller *get_controller(int index, char *array_name, |
d6857595 | 368 | u8 *array_id, struct scsi_device *sdev) |
fbd7ab3e CS |
369 | { |
370 | struct rdac_controller *ctlr, *tmp; | |
371 | ||
fbd7ab3e | 372 | list_for_each_entry(tmp, &ctlr_list, node) { |
a53becc9 | 373 | if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) && |
d6857595 CS |
374 | (tmp->index == index) && |
375 | (tmp->host == sdev->host)) { | |
fbd7ab3e | 376 | kref_get(&tmp->kref); |
fbd7ab3e CS |
377 | return tmp; |
378 | } | |
379 | } | |
380 | ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC); | |
381 | if (!ctlr) | |
3569e537 | 382 | return NULL; |
fbd7ab3e CS |
383 | |
384 | /* initialize fields of controller */ | |
a53becc9 CS |
385 | memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN); |
386 | ctlr->index = index; | |
d6857595 | 387 | ctlr->host = sdev->host; |
1527666e MB |
388 | memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN); |
389 | ||
fbd7ab3e CS |
390 | kref_init(&ctlr->kref); |
391 | ctlr->use_ms10 = -1; | |
970f3f47 CS |
392 | ctlr->ms_queued = 0; |
393 | ctlr->ms_sdev = NULL; | |
394 | spin_lock_init(&ctlr->ms_lock); | |
395 | INIT_WORK(&ctlr->ms_work, send_mode_select); | |
396 | INIT_LIST_HEAD(&ctlr->ms_head); | |
fbd7ab3e | 397 | list_add(&ctlr->node, &ctlr_list); |
1a5dc166 | 398 | INIT_LIST_HEAD(&ctlr->dh_list); |
3569e537 | 399 | |
fbd7ab3e CS |
400 | return ctlr; |
401 | } | |
402 | ||
403 | static int submit_inquiry(struct scsi_device *sdev, int page_code, | |
ca9f0089 | 404 | unsigned int len, struct rdac_dh_data *h) |
fbd7ab3e CS |
405 | { |
406 | struct request *rq; | |
407 | struct request_queue *q = sdev->request_queue; | |
fbd7ab3e CS |
408 | int err = SCSI_DH_RES_TEMP_UNAVAIL; |
409 | ||
410 | rq = get_rdac_req(sdev, &h->inq, len, READ); | |
411 | if (!rq) | |
412 | goto done; | |
413 | ||
414 | /* Prepare the command. */ | |
415 | rq->cmd[0] = INQUIRY; | |
416 | rq->cmd[1] = 1; | |
417 | rq->cmd[2] = page_code; | |
418 | rq->cmd[4] = len; | |
419 | rq->cmd_len = COMMAND_SIZE(INQUIRY); | |
ca9f0089 HR |
420 | |
421 | rq->sense = h->sense; | |
422 | memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); | |
423 | rq->sense_len = 0; | |
424 | ||
fbd7ab3e CS |
425 | err = blk_execute_rq(q, NULL, rq, 1); |
426 | if (err == -EIO) | |
427 | err = SCSI_DH_IO; | |
ca9f0089 HR |
428 | |
429 | blk_put_request(rq); | |
fbd7ab3e CS |
430 | done: |
431 | return err; | |
432 | } | |
433 | ||
1527666e | 434 | static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h, |
a53becc9 | 435 | char *array_name, u8 *array_id) |
fbd7ab3e | 436 | { |
1527666e | 437 | int err, i; |
fbd7ab3e | 438 | struct c8_inquiry *inqp; |
fbd7ab3e | 439 | |
ca9f0089 | 440 | err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h); |
fbd7ab3e CS |
441 | if (err == SCSI_DH_OK) { |
442 | inqp = &h->inq.c8; | |
ca9f0089 HR |
443 | if (inqp->page_code != 0xc8) |
444 | return SCSI_DH_NOSYS; | |
445 | if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' || | |
446 | inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd') | |
447 | return SCSI_DH_NOSYS; | |
8479fca1 | 448 | h->lun = inqp->lun[7]; /* Uses only the last byte */ |
1527666e MB |
449 | |
450 | for(i=0; i<ARRAY_LABEL_LEN-1; ++i) | |
451 | *(array_name+i) = inqp->array_user_label[(2*i)+1]; | |
452 | ||
453 | *(array_name+ARRAY_LABEL_LEN-1) = '\0'; | |
a53becc9 CS |
454 | memset(array_id, 0, UNIQUE_ID_LEN); |
455 | memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len); | |
fbd7ab3e CS |
456 | } |
457 | return err; | |
458 | } | |
459 | ||
ca9f0089 | 460 | static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h) |
fbd7ab3e | 461 | { |
1a5dc166 HR |
462 | int err, access_state; |
463 | struct rdac_dh_data *tmp; | |
fbd7ab3e | 464 | struct c9_inquiry *inqp; |
fbd7ab3e | 465 | |
9eece961 | 466 | h->state = RDAC_STATE_ACTIVE; |
ca9f0089 | 467 | err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h); |
fbd7ab3e | 468 | if (err == SCSI_DH_OK) { |
fbd7ab3e | 469 | inqp = &h->inq.c9; |
1c3afc42 MB |
470 | /* detect the operating mode */ |
471 | if ((inqp->avte_cvp >> 5) & 0x1) | |
472 | h->mode = RDAC_MODE_IOSHIP; /* LUN in IOSHIP mode */ | |
473 | else if (inqp->avte_cvp >> 7) | |
474 | h->mode = RDAC_MODE_AVT; /* LUN in AVT mode */ | |
475 | else | |
476 | h->mode = RDAC_MODE; /* LUN in RDAC mode */ | |
477 | ||
478 | /* Update ownership */ | |
1a5dc166 | 479 | if (inqp->avte_cvp & 0x1) { |
ca9f0089 | 480 | h->lun_state = RDAC_LUN_OWNED; |
1a5dc166 HR |
481 | access_state = SCSI_ACCESS_STATE_OPTIMAL; |
482 | } else { | |
1c3afc42 | 483 | h->lun_state = RDAC_LUN_UNOWNED; |
1a5dc166 | 484 | if (h->mode == RDAC_MODE) { |
1c3afc42 | 485 | h->state = RDAC_STATE_PASSIVE; |
1a5dc166 HR |
486 | access_state = SCSI_ACCESS_STATE_STANDBY; |
487 | } else | |
488 | access_state = SCSI_ACCESS_STATE_ACTIVE; | |
ca9f0089 | 489 | } |
ca9f0089 | 490 | |
1c3afc42 | 491 | /* Update path prio*/ |
1a5dc166 | 492 | if (inqp->path_prio & 0x1) { |
1c3afc42 | 493 | h->preferred = RDAC_PREFERRED; |
1a5dc166 HR |
494 | access_state |= SCSI_ACCESS_STATE_PREFERRED; |
495 | } else | |
1c3afc42 | 496 | h->preferred = RDAC_NON_PREFERRED; |
1a5dc166 HR |
497 | rcu_read_lock(); |
498 | list_for_each_entry_rcu(tmp, &h->ctlr->dh_list, node) { | |
499 | /* h->sdev should always be valid */ | |
500 | BUG_ON(!tmp->sdev); | |
501 | tmp->sdev->access_state = access_state; | |
502 | } | |
503 | rcu_read_unlock(); | |
1c3afc42 | 504 | } |
5a36756b | 505 | |
fbd7ab3e CS |
506 | return err; |
507 | } | |
508 | ||
ca9f0089 | 509 | static int initialize_controller(struct scsi_device *sdev, |
a53becc9 | 510 | struct rdac_dh_data *h, char *array_name, u8 *array_id) |
fbd7ab3e | 511 | { |
a53becc9 | 512 | int err, index; |
fbd7ab3e | 513 | struct c4_inquiry *inqp; |
fbd7ab3e | 514 | |
ca9f0089 | 515 | err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h); |
fbd7ab3e CS |
516 | if (err == SCSI_DH_OK) { |
517 | inqp = &h->inq.c4; | |
a53becc9 CS |
518 | /* get the controller index */ |
519 | if (inqp->slot_id[1] == 0x31) | |
520 | index = 0; | |
521 | else | |
522 | index = 1; | |
3569e537 MB |
523 | |
524 | spin_lock(&list_lock); | |
d6857595 | 525 | h->ctlr = get_controller(index, array_name, array_id, sdev); |
fbd7ab3e CS |
526 | if (!h->ctlr) |
527 | err = SCSI_DH_RES_TEMP_UNAVAIL; | |
1a5dc166 HR |
528 | else { |
529 | list_add_rcu(&h->node, &h->ctlr->dh_list); | |
530 | h->sdev = sdev; | |
531 | } | |
3569e537 | 532 | spin_unlock(&list_lock); |
fbd7ab3e CS |
533 | } |
534 | return err; | |
535 | } | |
536 | ||
ca9f0089 | 537 | static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h) |
fbd7ab3e CS |
538 | { |
539 | int err; | |
540 | struct c2_inquiry *inqp; | |
fbd7ab3e | 541 | |
ca9f0089 | 542 | err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h); |
fbd7ab3e CS |
543 | if (err == SCSI_DH_OK) { |
544 | inqp = &h->inq.c2; | |
545 | /* | |
546 | * If more than MODE6_MAX_LUN luns are supported, use | |
547 | * mode select 10 | |
548 | */ | |
549 | if (inqp->max_lun_supported >= MODE6_MAX_LUN) | |
550 | h->ctlr->use_ms10 = 1; | |
551 | else | |
552 | h->ctlr->use_ms10 = 0; | |
553 | } | |
554 | return err; | |
555 | } | |
556 | ||
ca9f0089 | 557 | static int mode_select_handle_sense(struct scsi_device *sdev, |
970f3f47 | 558 | unsigned char *sensebuf) |
fbd7ab3e CS |
559 | { |
560 | struct scsi_sense_hdr sense_hdr; | |
7687fb92 | 561 | int err = SCSI_DH_IO, ret; |
ee14c674 | 562 | struct rdac_dh_data *h = sdev->handler_data; |
fbd7ab3e | 563 | |
ca9f0089 | 564 | ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr); |
fbd7ab3e CS |
565 | if (!ret) |
566 | goto done; | |
567 | ||
7687fb92 CV |
568 | switch (sense_hdr.sense_key) { |
569 | case NO_SENSE: | |
570 | case ABORTED_COMMAND: | |
571 | case UNIT_ATTENTION: | |
fbd7ab3e | 572 | err = SCSI_DH_RETRY; |
7687fb92 CV |
573 | break; |
574 | case NOT_READY: | |
575 | if (sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x01) | |
576 | /* LUN Not Ready and is in the Process of Becoming | |
577 | * Ready | |
578 | */ | |
579 | err = SCSI_DH_RETRY; | |
580 | break; | |
581 | case ILLEGAL_REQUEST: | |
582 | if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36) | |
583 | /* | |
584 | * Command Lock contention | |
585 | */ | |
d2d06d4f | 586 | err = SCSI_DH_IMM_RETRY; |
7687fb92 CV |
587 | break; |
588 | default: | |
dd784edc | 589 | break; |
fbd7ab3e CS |
590 | } |
591 | ||
dd784edc MB |
592 | RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " |
593 | "MODE_SELECT returned with sense %02x/%02x/%02x", | |
594 | (char *) h->ctlr->array_name, h->ctlr->index, | |
595 | sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq); | |
596 | ||
fbd7ab3e CS |
597 | done: |
598 | return err; | |
599 | } | |
600 | ||
970f3f47 | 601 | static void send_mode_select(struct work_struct *work) |
fbd7ab3e | 602 | { |
970f3f47 CS |
603 | struct rdac_controller *ctlr = |
604 | container_of(work, struct rdac_controller, ms_work); | |
fbd7ab3e | 605 | struct request *rq; |
970f3f47 | 606 | struct scsi_device *sdev = ctlr->ms_sdev; |
ee14c674 | 607 | struct rdac_dh_data *h = sdev->handler_data; |
fbd7ab3e | 608 | struct request_queue *q = sdev->request_queue; |
c85f8cb9 | 609 | int err, retry_cnt = RDAC_RETRY_COUNT; |
970f3f47 CS |
610 | struct rdac_queue_data *tmp, *qdata; |
611 | LIST_HEAD(list); | |
970f3f47 CS |
612 | |
613 | spin_lock(&ctlr->ms_lock); | |
614 | list_splice_init(&ctlr->ms_head, &list); | |
615 | ctlr->ms_queued = 0; | |
616 | ctlr->ms_sdev = NULL; | |
617 | spin_unlock(&ctlr->ms_lock); | |
618 | ||
c85f8cb9 CS |
619 | retry: |
620 | err = SCSI_DH_RES_TEMP_UNAVAIL; | |
04b6e153 | 621 | rq = rdac_failover_get(sdev, h, &list); |
fbd7ab3e CS |
622 | if (!rq) |
623 | goto done; | |
624 | ||
dd784edc MB |
625 | RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " |
626 | "%s MODE_SELECT command", | |
627 | (char *) h->ctlr->array_name, h->ctlr->index, | |
c85f8cb9 | 628 | (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying"); |
fbd7ab3e CS |
629 | |
630 | err = blk_execute_rq(q, NULL, rq, 1); | |
c85f8cb9 CS |
631 | blk_put_request(rq); |
632 | if (err != SCSI_DH_OK) { | |
ca9f0089 | 633 | err = mode_select_handle_sense(sdev, h->sense); |
c85f8cb9 CS |
634 | if (err == SCSI_DH_RETRY && retry_cnt--) |
635 | goto retry; | |
d2d06d4f HR |
636 | if (err == SCSI_DH_IMM_RETRY) |
637 | goto retry; | |
c85f8cb9 | 638 | } |
dd784edc | 639 | if (err == SCSI_DH_OK) { |
fbd7ab3e | 640 | h->state = RDAC_STATE_ACTIVE; |
dd784edc MB |
641 | RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " |
642 | "MODE_SELECT completed", | |
643 | (char *) h->ctlr->array_name, h->ctlr->index); | |
644 | } | |
ca9f0089 | 645 | |
fbd7ab3e | 646 | done: |
970f3f47 CS |
647 | list_for_each_entry_safe(qdata, tmp, &list, entry) { |
648 | list_del(&qdata->entry); | |
649 | if (err == SCSI_DH_OK) | |
650 | qdata->h->state = RDAC_STATE_ACTIVE; | |
651 | if (qdata->callback_fn) | |
652 | qdata->callback_fn(qdata->callback_data, err); | |
653 | kfree(qdata); | |
654 | } | |
655 | return; | |
656 | } | |
657 | ||
658 | static int queue_mode_select(struct scsi_device *sdev, | |
659 | activate_complete fn, void *data) | |
660 | { | |
661 | struct rdac_queue_data *qdata; | |
662 | struct rdac_controller *ctlr; | |
663 | ||
664 | qdata = kzalloc(sizeof(*qdata), GFP_KERNEL); | |
665 | if (!qdata) | |
666 | return SCSI_DH_RETRY; | |
667 | ||
ee14c674 | 668 | qdata->h = sdev->handler_data; |
970f3f47 CS |
669 | qdata->callback_fn = fn; |
670 | qdata->callback_data = data; | |
671 | ||
672 | ctlr = qdata->h->ctlr; | |
673 | spin_lock(&ctlr->ms_lock); | |
674 | list_add_tail(&qdata->entry, &ctlr->ms_head); | |
675 | if (!ctlr->ms_queued) { | |
676 | ctlr->ms_queued = 1; | |
677 | ctlr->ms_sdev = sdev; | |
678 | queue_work(kmpath_rdacd, &ctlr->ms_work); | |
679 | } | |
680 | spin_unlock(&ctlr->ms_lock); | |
681 | return SCSI_DH_OK; | |
fbd7ab3e CS |
682 | } |
683 | ||
3ae31f6a CS |
684 | static int rdac_activate(struct scsi_device *sdev, |
685 | activate_complete fn, void *data) | |
fbd7ab3e | 686 | { |
ee14c674 | 687 | struct rdac_dh_data *h = sdev->handler_data; |
fbd7ab3e | 688 | int err = SCSI_DH_OK; |
3425fbfe | 689 | int act = 0; |
fbd7ab3e | 690 | |
ca9f0089 HR |
691 | err = check_ownership(sdev, h); |
692 | if (err != SCSI_DH_OK) | |
fbd7ab3e | 693 | goto done; |
fbd7ab3e | 694 | |
3425fbfe MB |
695 | switch (h->mode) { |
696 | case RDAC_MODE: | |
697 | if (h->lun_state == RDAC_LUN_UNOWNED) | |
698 | act = 1; | |
699 | break; | |
700 | case RDAC_MODE_IOSHIP: | |
701 | if ((h->lun_state == RDAC_LUN_UNOWNED) && | |
702 | (h->preferred == RDAC_PREFERRED)) | |
703 | act = 1; | |
704 | break; | |
705 | default: | |
706 | break; | |
707 | } | |
708 | ||
709 | if (act) { | |
970f3f47 CS |
710 | err = queue_mode_select(sdev, fn, data); |
711 | if (err == SCSI_DH_OK) | |
712 | return 0; | |
713 | } | |
fbd7ab3e | 714 | done: |
3ae31f6a CS |
715 | if (fn) |
716 | fn(data, err); | |
717 | return 0; | |
fbd7ab3e CS |
718 | } |
719 | ||
720 | static int rdac_prep_fn(struct scsi_device *sdev, struct request *req) | |
721 | { | |
ee14c674 | 722 | struct rdac_dh_data *h = sdev->handler_data; |
fbd7ab3e CS |
723 | int ret = BLKPREP_OK; |
724 | ||
725 | if (h->state != RDAC_STATE_ACTIVE) { | |
726 | ret = BLKPREP_KILL; | |
e8064021 | 727 | req->rq_flags |= RQF_QUIET; |
fbd7ab3e CS |
728 | } |
729 | return ret; | |
730 | ||
731 | } | |
732 | ||
733 | static int rdac_check_sense(struct scsi_device *sdev, | |
734 | struct scsi_sense_hdr *sense_hdr) | |
735 | { | |
ee14c674 | 736 | struct rdac_dh_data *h = sdev->handler_data; |
dd784edc MB |
737 | |
738 | RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, " | |
739 | "I/O returned with sense %02x/%02x/%02x", | |
740 | (char *) h->ctlr->array_name, h->ctlr->index, | |
741 | sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq); | |
742 | ||
fbd7ab3e CS |
743 | switch (sense_hdr->sense_key) { |
744 | case NOT_READY: | |
8f032263 CV |
745 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01) |
746 | /* LUN Not Ready - Logical Unit Not Ready and is in | |
747 | * the process of becoming ready | |
748 | * Just retry. | |
749 | */ | |
750 | return ADD_TO_MLQUEUE; | |
fbd7ab3e CS |
751 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81) |
752 | /* LUN Not Ready - Storage firmware incompatible | |
753 | * Manual code synchonisation required. | |
754 | * | |
755 | * Nothing we can do here. Try to bypass the path. | |
756 | */ | |
757 | return SUCCESS; | |
758 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1) | |
759 | /* LUN Not Ready - Quiescense in progress | |
760 | * | |
761 | * Just retry and wait. | |
762 | */ | |
c7dbb627 | 763 | return ADD_TO_MLQUEUE; |
af50bb99 CV |
764 | if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02) |
765 | /* LUN Not Ready - Quiescense in progress | |
766 | * or has been achieved | |
767 | * Just retry. | |
768 | */ | |
769 | return ADD_TO_MLQUEUE; | |
fbd7ab3e CS |
770 | break; |
771 | case ILLEGAL_REQUEST: | |
772 | if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) { | |
773 | /* Invalid Request - Current Logical Unit Ownership. | |
774 | * Controller is not the current owner of the LUN, | |
775 | * Fail the path, so that the other path be used. | |
776 | */ | |
777 | h->state = RDAC_STATE_PASSIVE; | |
778 | return SUCCESS; | |
779 | } | |
780 | break; | |
781 | case UNIT_ATTENTION: | |
782 | if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00) | |
783 | /* | |
784 | * Power On, Reset, or Bus Device Reset, just retry. | |
ea41e415 CV |
785 | */ |
786 | return ADD_TO_MLQUEUE; | |
787 | if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02) | |
788 | /* | |
789 | * Quiescence in progress , just retry. | |
fbd7ab3e | 790 | */ |
c7dbb627 | 791 | return ADD_TO_MLQUEUE; |
fbd7ab3e CS |
792 | break; |
793 | } | |
794 | /* success just means we do not care what scsi-ml does */ | |
795 | return SCSI_RETURN_NOT_HANDLED; | |
796 | } | |
797 | ||
ee14c674 | 798 | static int rdac_bus_attach(struct scsi_device *sdev) |
fbd7ab3e | 799 | { |
fbd7ab3e | 800 | struct rdac_dh_data *h; |
ca9f0089 | 801 | int err; |
1527666e | 802 | char array_name[ARRAY_LABEL_LEN]; |
a53becc9 | 803 | char array_id[UNIQUE_ID_LEN]; |
fbd7ab3e | 804 | |
cd37743f | 805 | h = kzalloc(sizeof(*h) , GFP_KERNEL); |
1d520328 | 806 | if (!h) |
ee14c674 | 807 | return -ENOMEM; |
765cbc6d HR |
808 | h->lun = UNINITIALIZED_LUN; |
809 | h->state = RDAC_STATE_ACTIVE; | |
ca9f0089 | 810 | |
a53becc9 | 811 | err = get_lun_info(sdev, h, array_name, array_id); |
ca9f0089 HR |
812 | if (err != SCSI_DH_OK) |
813 | goto failed; | |
814 | ||
a53becc9 | 815 | err = initialize_controller(sdev, h, array_name, array_id); |
ca9f0089 HR |
816 | if (err != SCSI_DH_OK) |
817 | goto failed; | |
818 | ||
87b79a53 MB |
819 | err = check_ownership(sdev, h); |
820 | if (err != SCSI_DH_OK) | |
821 | goto clean_ctlr; | |
822 | ||
823 | err = set_mode_select(sdev, h); | |
824 | if (err != SCSI_DH_OK) | |
825 | goto clean_ctlr; | |
826 | ||
ca9f0089 | 827 | sdev_printk(KERN_NOTICE, sdev, |
eebe9b96 MB |
828 | "%s: LUN %d (%s) (%s)\n", |
829 | RDAC_NAME, h->lun, mode[(int)h->mode], | |
830 | lun_state[(int)h->lun_state]); | |
fbd7ab3e | 831 | |
ee14c674 CH |
832 | sdev->handler_data = h; |
833 | return 0; | |
ca9f0089 | 834 | |
87b79a53 | 835 | clean_ctlr: |
3569e537 | 836 | spin_lock(&list_lock); |
87b79a53 | 837 | kref_put(&h->ctlr->kref, release_controller); |
3569e537 | 838 | spin_unlock(&list_lock); |
87b79a53 | 839 | |
ca9f0089 | 840 | failed: |
cd37743f | 841 | kfree(h); |
ee14c674 | 842 | return -EINVAL; |
fbd7ab3e CS |
843 | } |
844 | ||
765cbc6d HR |
845 | static void rdac_bus_detach( struct scsi_device *sdev ) |
846 | { | |
ee14c674 | 847 | struct rdac_dh_data *h = sdev->handler_data; |
765cbc6d | 848 | |
3569e537 MB |
849 | if (h->ctlr && h->ctlr->ms_queued) |
850 | flush_workqueue(kmpath_rdacd); | |
851 | ||
3569e537 | 852 | spin_lock(&list_lock); |
1a5dc166 HR |
853 | if (h->ctlr) { |
854 | list_del_rcu(&h->node); | |
855 | h->sdev = NULL; | |
765cbc6d | 856 | kref_put(&h->ctlr->kref, release_controller); |
1a5dc166 | 857 | } |
3569e537 | 858 | spin_unlock(&list_lock); |
ee14c674 | 859 | sdev->handler_data = NULL; |
cd37743f | 860 | kfree(h); |
765cbc6d HR |
861 | } |
862 | ||
1d520328 CH |
863 | static struct scsi_device_handler rdac_dh = { |
864 | .name = RDAC_NAME, | |
865 | .module = THIS_MODULE, | |
866 | .prep_fn = rdac_prep_fn, | |
867 | .check_sense = rdac_check_sense, | |
868 | .attach = rdac_bus_attach, | |
869 | .detach = rdac_bus_detach, | |
870 | .activate = rdac_activate, | |
1d520328 | 871 | }; |
765cbc6d | 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"); | |
9fc397fc RW |
890 | |
891 | r = -EINVAL; | |
970f3f47 CS |
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 | ||
5f7a6433 | 906 | MODULE_DESCRIPTION("Multipath LSI/Engenio/NetApp E-Series RDAC driver"); |
fbd7ab3e | 907 | MODULE_AUTHOR("Mike Christie, Chandra Seetharaman"); |
a0b990c6 | 908 | MODULE_VERSION("01.00.0000.0000"); |
fbd7ab3e | 909 | MODULE_LICENSE("GPL"); |