Commit | Line | Data |
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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 | union { |
209 | struct c2_inquiry c2; | |
210 | struct c4_inquiry c4; | |
211 | struct c8_inquiry c8; | |
212 | struct c9_inquiry c9; | |
213 | } inq; | |
214 | }; | |
215 | ||
eebe9b96 MB |
216 | static const char *mode[] = { |
217 | "RDAC", | |
218 | "AVT", | |
219 | "IOSHIP", | |
220 | }; | |
ca9f0089 HR |
221 | static const char *lun_state[] = |
222 | { | |
223 | "unowned", | |
224 | "owned", | |
ca9f0089 HR |
225 | }; |
226 | ||
970f3f47 CS |
227 | struct rdac_queue_data { |
228 | struct list_head entry; | |
229 | struct rdac_dh_data *h; | |
230 | activate_complete callback_fn; | |
231 | void *callback_data; | |
232 | }; | |
233 | ||
fbd7ab3e CS |
234 | static LIST_HEAD(ctlr_list); |
235 | static DEFINE_SPINLOCK(list_lock); | |
970f3f47 CS |
236 | static struct workqueue_struct *kmpath_rdacd; |
237 | static void send_mode_select(struct work_struct *work); | |
fbd7ab3e | 238 | |
dd784edc MB |
239 | /* |
240 | * module parameter to enable rdac debug logging. | |
241 | * 2 bits for each type of logging, only two types defined for now | |
242 | * Can be enhanced if required at later point | |
243 | */ | |
244 | static int rdac_logging = 1; | |
245 | module_param(rdac_logging, int, S_IRUGO|S_IWUSR); | |
246 | MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, " | |
247 | "Default is 1 - failover logging enabled, " | |
248 | "set it to 0xF to enable all the logs"); | |
249 | ||
250 | #define RDAC_LOG_FAILOVER 0 | |
251 | #define RDAC_LOG_SENSE 2 | |
252 | ||
253 | #define RDAC_LOG_BITS 2 | |
254 | ||
255 | #define RDAC_LOG_LEVEL(SHIFT) \ | |
256 | ((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1)) | |
257 | ||
258 | #define RDAC_LOG(SHIFT, sdev, f, arg...) \ | |
259 | do { \ | |
260 | if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \ | |
261 | sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \ | |
262 | } while (0); | |
263 | ||
32782557 HR |
264 | static unsigned int rdac_failover_get(struct rdac_controller *ctlr, |
265 | struct list_head *list, | |
266 | unsigned char *cdb) | |
fbd7ab3e | 267 | { |
fbd7ab3e CS |
268 | struct rdac_mode_common *common; |
269 | unsigned data_size; | |
04b6e153 MB |
270 | struct rdac_queue_data *qdata; |
271 | u8 *lun_table; | |
fbd7ab3e | 272 | |
0648a07c | 273 | if (ctlr->use_ms10) { |
fbd7ab3e CS |
274 | struct rdac_pg_expanded *rdac_pg; |
275 | ||
276 | data_size = sizeof(struct rdac_pg_expanded); | |
0648a07c | 277 | rdac_pg = &ctlr->mode_select.expanded; |
fbd7ab3e CS |
278 | memset(rdac_pg, 0, data_size); |
279 | common = &rdac_pg->common; | |
280 | rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40; | |
281 | rdac_pg->subpage_code = 0x1; | |
282 | rdac_pg->page_len[0] = 0x01; | |
283 | rdac_pg->page_len[1] = 0x28; | |
04b6e153 | 284 | lun_table = rdac_pg->lun_table; |
fbd7ab3e CS |
285 | } else { |
286 | struct rdac_pg_legacy *rdac_pg; | |
287 | ||
288 | data_size = sizeof(struct rdac_pg_legacy); | |
0648a07c | 289 | rdac_pg = &ctlr->mode_select.legacy; |
fbd7ab3e CS |
290 | memset(rdac_pg, 0, data_size); |
291 | common = &rdac_pg->common; | |
292 | rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER; | |
293 | rdac_pg->page_len = 0x68; | |
04b6e153 | 294 | lun_table = rdac_pg->lun_table; |
fbd7ab3e CS |
295 | } |
296 | common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS; | |
297 | common->quiescence_timeout = RDAC_QUIESCENCE_TIME; | |
298 | common->rdac_options = RDAC_FORCED_QUIESENCE; | |
299 | ||
04b6e153 MB |
300 | list_for_each_entry(qdata, list, entry) { |
301 | lun_table[qdata->h->lun] = 0x81; | |
302 | } | |
303 | ||
fbd7ab3e | 304 | /* Prepare the command. */ |
0648a07c | 305 | if (ctlr->use_ms10) { |
32782557 HR |
306 | cdb[0] = MODE_SELECT_10; |
307 | cdb[7] = data_size >> 8; | |
308 | cdb[8] = data_size & 0xff; | |
fbd7ab3e | 309 | } else { |
32782557 HR |
310 | cdb[0] = MODE_SELECT; |
311 | cdb[4] = data_size; | |
fbd7ab3e | 312 | } |
fbd7ab3e | 313 | |
32782557 | 314 | return data_size; |
fbd7ab3e CS |
315 | } |
316 | ||
317 | static void release_controller(struct kref *kref) | |
318 | { | |
319 | struct rdac_controller *ctlr; | |
320 | ctlr = container_of(kref, struct rdac_controller, kref); | |
321 | ||
fbd7ab3e | 322 | list_del(&ctlr->node); |
fbd7ab3e CS |
323 | kfree(ctlr); |
324 | } | |
325 | ||
a53becc9 | 326 | static struct rdac_controller *get_controller(int index, char *array_name, |
d6857595 | 327 | u8 *array_id, struct scsi_device *sdev) |
fbd7ab3e CS |
328 | { |
329 | struct rdac_controller *ctlr, *tmp; | |
330 | ||
fbd7ab3e | 331 | list_for_each_entry(tmp, &ctlr_list, node) { |
a53becc9 | 332 | if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) && |
d6857595 CS |
333 | (tmp->index == index) && |
334 | (tmp->host == sdev->host)) { | |
fbd7ab3e | 335 | kref_get(&tmp->kref); |
fbd7ab3e CS |
336 | return tmp; |
337 | } | |
338 | } | |
339 | ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC); | |
340 | if (!ctlr) | |
3569e537 | 341 | return NULL; |
fbd7ab3e CS |
342 | |
343 | /* initialize fields of controller */ | |
a53becc9 CS |
344 | memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN); |
345 | ctlr->index = index; | |
d6857595 | 346 | ctlr->host = sdev->host; |
1527666e MB |
347 | memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN); |
348 | ||
fbd7ab3e CS |
349 | kref_init(&ctlr->kref); |
350 | ctlr->use_ms10 = -1; | |
970f3f47 CS |
351 | ctlr->ms_queued = 0; |
352 | ctlr->ms_sdev = NULL; | |
353 | spin_lock_init(&ctlr->ms_lock); | |
354 | INIT_WORK(&ctlr->ms_work, send_mode_select); | |
355 | INIT_LIST_HEAD(&ctlr->ms_head); | |
fbd7ab3e | 356 | list_add(&ctlr->node, &ctlr_list); |
1a5dc166 | 357 | INIT_LIST_HEAD(&ctlr->dh_list); |
3569e537 | 358 | |
fbd7ab3e CS |
359 | return ctlr; |
360 | } | |
361 | ||
1527666e | 362 | static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h, |
a53becc9 | 363 | char *array_name, u8 *array_id) |
fbd7ab3e | 364 | { |
32782557 HR |
365 | int err = SCSI_DH_IO, i; |
366 | struct c8_inquiry *inqp = &h->inq.c8; | |
fbd7ab3e | 367 | |
32782557 HR |
368 | if (!scsi_get_vpd_page(sdev, 0xC8, (unsigned char *)inqp, |
369 | sizeof(struct c8_inquiry))) { | |
ca9f0089 HR |
370 | if (inqp->page_code != 0xc8) |
371 | return SCSI_DH_NOSYS; | |
372 | if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' || | |
373 | inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd') | |
374 | return SCSI_DH_NOSYS; | |
8479fca1 | 375 | h->lun = inqp->lun[7]; /* Uses only the last byte */ |
1527666e MB |
376 | |
377 | for(i=0; i<ARRAY_LABEL_LEN-1; ++i) | |
378 | *(array_name+i) = inqp->array_user_label[(2*i)+1]; | |
379 | ||
380 | *(array_name+ARRAY_LABEL_LEN-1) = '\0'; | |
a53becc9 CS |
381 | memset(array_id, 0, UNIQUE_ID_LEN); |
382 | memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len); | |
32782557 | 383 | err = SCSI_DH_OK; |
fbd7ab3e CS |
384 | } |
385 | return err; | |
386 | } | |
387 | ||
ca9f0089 | 388 | static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h) |
fbd7ab3e | 389 | { |
32782557 | 390 | int err = SCSI_DH_IO, access_state; |
1a5dc166 | 391 | struct rdac_dh_data *tmp; |
32782557 | 392 | struct c9_inquiry *inqp = &h->inq.c9; |
fbd7ab3e | 393 | |
9eece961 | 394 | h->state = RDAC_STATE_ACTIVE; |
32782557 HR |
395 | if (!scsi_get_vpd_page(sdev, 0xC9, (unsigned char *)inqp, |
396 | sizeof(struct c9_inquiry))) { | |
1c3afc42 MB |
397 | /* detect the operating mode */ |
398 | if ((inqp->avte_cvp >> 5) & 0x1) | |
399 | h->mode = RDAC_MODE_IOSHIP; /* LUN in IOSHIP mode */ | |
400 | else if (inqp->avte_cvp >> 7) | |
401 | h->mode = RDAC_MODE_AVT; /* LUN in AVT mode */ | |
402 | else | |
403 | h->mode = RDAC_MODE; /* LUN in RDAC mode */ | |
404 | ||
405 | /* Update ownership */ | |
1a5dc166 | 406 | if (inqp->avte_cvp & 0x1) { |
ca9f0089 | 407 | h->lun_state = RDAC_LUN_OWNED; |
1a5dc166 HR |
408 | access_state = SCSI_ACCESS_STATE_OPTIMAL; |
409 | } else { | |
1c3afc42 | 410 | h->lun_state = RDAC_LUN_UNOWNED; |
1a5dc166 | 411 | if (h->mode == RDAC_MODE) { |
1c3afc42 | 412 | h->state = RDAC_STATE_PASSIVE; |
1a5dc166 HR |
413 | access_state = SCSI_ACCESS_STATE_STANDBY; |
414 | } else | |
415 | access_state = SCSI_ACCESS_STATE_ACTIVE; | |
ca9f0089 | 416 | } |
ca9f0089 | 417 | |
1c3afc42 | 418 | /* Update path prio*/ |
1a5dc166 | 419 | if (inqp->path_prio & 0x1) { |
1c3afc42 | 420 | h->preferred = RDAC_PREFERRED; |
1a5dc166 HR |
421 | access_state |= SCSI_ACCESS_STATE_PREFERRED; |
422 | } else | |
1c3afc42 | 423 | h->preferred = RDAC_NON_PREFERRED; |
1a5dc166 HR |
424 | rcu_read_lock(); |
425 | list_for_each_entry_rcu(tmp, &h->ctlr->dh_list, node) { | |
426 | /* h->sdev should always be valid */ | |
427 | BUG_ON(!tmp->sdev); | |
428 | tmp->sdev->access_state = access_state; | |
429 | } | |
430 | rcu_read_unlock(); | |
32782557 | 431 | err = SCSI_DH_OK; |
1c3afc42 | 432 | } |
5a36756b | 433 | |
fbd7ab3e CS |
434 | return err; |
435 | } | |
436 | ||
ca9f0089 | 437 | static int initialize_controller(struct scsi_device *sdev, |
a53becc9 | 438 | struct rdac_dh_data *h, char *array_name, u8 *array_id) |
fbd7ab3e | 439 | { |
32782557 HR |
440 | int err = SCSI_DH_IO, index; |
441 | struct c4_inquiry *inqp = &h->inq.c4; | |
fbd7ab3e | 442 | |
32782557 HR |
443 | if (!scsi_get_vpd_page(sdev, 0xC4, (unsigned char *)inqp, |
444 | sizeof(struct c4_inquiry))) { | |
a53becc9 CS |
445 | /* get the controller index */ |
446 | if (inqp->slot_id[1] == 0x31) | |
447 | index = 0; | |
448 | else | |
449 | index = 1; | |
3569e537 MB |
450 | |
451 | spin_lock(&list_lock); | |
d6857595 | 452 | h->ctlr = get_controller(index, array_name, array_id, sdev); |
fbd7ab3e CS |
453 | if (!h->ctlr) |
454 | err = SCSI_DH_RES_TEMP_UNAVAIL; | |
1a5dc166 HR |
455 | else { |
456 | list_add_rcu(&h->node, &h->ctlr->dh_list); | |
457 | h->sdev = sdev; | |
458 | } | |
3569e537 | 459 | spin_unlock(&list_lock); |
32782557 | 460 | err = SCSI_DH_OK; |
fbd7ab3e CS |
461 | } |
462 | return err; | |
463 | } | |
464 | ||
ca9f0089 | 465 | static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h) |
fbd7ab3e | 466 | { |
32782557 HR |
467 | int err = SCSI_DH_IO; |
468 | struct c2_inquiry *inqp = &h->inq.c2; | |
fbd7ab3e | 469 | |
32782557 HR |
470 | if (!scsi_get_vpd_page(sdev, 0xC2, (unsigned char *)inqp, |
471 | sizeof(struct c2_inquiry))) { | |
fbd7ab3e CS |
472 | /* |
473 | * If more than MODE6_MAX_LUN luns are supported, use | |
474 | * mode select 10 | |
475 | */ | |
476 | if (inqp->max_lun_supported >= MODE6_MAX_LUN) | |
477 | h->ctlr->use_ms10 = 1; | |
478 | else | |
479 | h->ctlr->use_ms10 = 0; | |
32782557 | 480 | err = SCSI_DH_OK; |
fbd7ab3e CS |
481 | } |
482 | return err; | |
483 | } | |
484 | ||
ca9f0089 | 485 | static int mode_select_handle_sense(struct scsi_device *sdev, |
32782557 | 486 | struct scsi_sense_hdr *sense_hdr) |
fbd7ab3e | 487 | { |
32782557 | 488 | int err = SCSI_DH_IO; |
ee14c674 | 489 | struct rdac_dh_data *h = sdev->handler_data; |
fbd7ab3e | 490 | |
32782557 | 491 | if (!scsi_sense_valid(sense_hdr)) |
fbd7ab3e CS |
492 | goto done; |
493 | ||
32782557 | 494 | switch (sense_hdr->sense_key) { |
7687fb92 CV |
495 | case NO_SENSE: |
496 | case ABORTED_COMMAND: | |
497 | case UNIT_ATTENTION: | |
fbd7ab3e | 498 | err = SCSI_DH_RETRY; |
7687fb92 CV |
499 | break; |
500 | case NOT_READY: | |
32782557 | 501 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01) |
7687fb92 CV |
502 | /* LUN Not Ready and is in the Process of Becoming |
503 | * Ready | |
504 | */ | |
505 | err = SCSI_DH_RETRY; | |
506 | break; | |
507 | case ILLEGAL_REQUEST: | |
32782557 | 508 | if (sense_hdr->asc == 0x91 && sense_hdr->ascq == 0x36) |
7687fb92 CV |
509 | /* |
510 | * Command Lock contention | |
511 | */ | |
d2d06d4f | 512 | err = SCSI_DH_IMM_RETRY; |
7687fb92 CV |
513 | break; |
514 | default: | |
dd784edc | 515 | break; |
fbd7ab3e CS |
516 | } |
517 | ||
dd784edc MB |
518 | RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " |
519 | "MODE_SELECT returned with sense %02x/%02x/%02x", | |
520 | (char *) h->ctlr->array_name, h->ctlr->index, | |
32782557 | 521 | sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq); |
dd784edc | 522 | |
fbd7ab3e CS |
523 | done: |
524 | return err; | |
525 | } | |
526 | ||
970f3f47 | 527 | static void send_mode_select(struct work_struct *work) |
fbd7ab3e | 528 | { |
970f3f47 CS |
529 | struct rdac_controller *ctlr = |
530 | container_of(work, struct rdac_controller, ms_work); | |
970f3f47 | 531 | struct scsi_device *sdev = ctlr->ms_sdev; |
ee14c674 | 532 | struct rdac_dh_data *h = sdev->handler_data; |
32782557 | 533 | int err = SCSI_DH_OK, retry_cnt = RDAC_RETRY_COUNT; |
970f3f47 CS |
534 | struct rdac_queue_data *tmp, *qdata; |
535 | LIST_HEAD(list); | |
92eb5062 | 536 | unsigned char cdb[MAX_COMMAND_SIZE]; |
32782557 HR |
537 | struct scsi_sense_hdr sshdr; |
538 | unsigned int data_size; | |
539 | u64 req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | | |
540 | REQ_FAILFAST_DRIVER; | |
970f3f47 CS |
541 | |
542 | spin_lock(&ctlr->ms_lock); | |
543 | list_splice_init(&ctlr->ms_head, &list); | |
544 | ctlr->ms_queued = 0; | |
545 | ctlr->ms_sdev = NULL; | |
546 | spin_unlock(&ctlr->ms_lock); | |
547 | ||
32782557 HR |
548 | retry: |
549 | data_size = rdac_failover_get(ctlr, &list, cdb); | |
fbd7ab3e | 550 | |
dd784edc MB |
551 | RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " |
552 | "%s MODE_SELECT command", | |
553 | (char *) h->ctlr->array_name, h->ctlr->index, | |
c85f8cb9 | 554 | (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying"); |
fbd7ab3e | 555 | |
fcbfffe2 CH |
556 | if (scsi_execute(sdev, cdb, DMA_TO_DEVICE, &h->ctlr->mode_select, |
557 | data_size, NULL, &sshdr, RDAC_TIMEOUT * HZ, | |
558 | RDAC_RETRIES, req_flags, 0, NULL)) { | |
32782557 | 559 | err = mode_select_handle_sense(sdev, &sshdr); |
c85f8cb9 CS |
560 | if (err == SCSI_DH_RETRY && retry_cnt--) |
561 | goto retry; | |
d2d06d4f HR |
562 | if (err == SCSI_DH_IMM_RETRY) |
563 | goto retry; | |
c85f8cb9 | 564 | } |
dd784edc | 565 | if (err == SCSI_DH_OK) { |
fbd7ab3e | 566 | h->state = RDAC_STATE_ACTIVE; |
dd784edc MB |
567 | RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " |
568 | "MODE_SELECT completed", | |
569 | (char *) h->ctlr->array_name, h->ctlr->index); | |
570 | } | |
ca9f0089 | 571 | |
970f3f47 CS |
572 | list_for_each_entry_safe(qdata, tmp, &list, entry) { |
573 | list_del(&qdata->entry); | |
574 | if (err == SCSI_DH_OK) | |
575 | qdata->h->state = RDAC_STATE_ACTIVE; | |
576 | if (qdata->callback_fn) | |
577 | qdata->callback_fn(qdata->callback_data, err); | |
578 | kfree(qdata); | |
579 | } | |
580 | return; | |
581 | } | |
582 | ||
583 | static int queue_mode_select(struct scsi_device *sdev, | |
584 | activate_complete fn, void *data) | |
585 | { | |
586 | struct rdac_queue_data *qdata; | |
587 | struct rdac_controller *ctlr; | |
588 | ||
589 | qdata = kzalloc(sizeof(*qdata), GFP_KERNEL); | |
590 | if (!qdata) | |
591 | return SCSI_DH_RETRY; | |
592 | ||
ee14c674 | 593 | qdata->h = sdev->handler_data; |
970f3f47 CS |
594 | qdata->callback_fn = fn; |
595 | qdata->callback_data = data; | |
596 | ||
597 | ctlr = qdata->h->ctlr; | |
598 | spin_lock(&ctlr->ms_lock); | |
599 | list_add_tail(&qdata->entry, &ctlr->ms_head); | |
600 | if (!ctlr->ms_queued) { | |
601 | ctlr->ms_queued = 1; | |
602 | ctlr->ms_sdev = sdev; | |
603 | queue_work(kmpath_rdacd, &ctlr->ms_work); | |
604 | } | |
605 | spin_unlock(&ctlr->ms_lock); | |
606 | return SCSI_DH_OK; | |
fbd7ab3e CS |
607 | } |
608 | ||
3ae31f6a CS |
609 | static int rdac_activate(struct scsi_device *sdev, |
610 | activate_complete fn, void *data) | |
fbd7ab3e | 611 | { |
ee14c674 | 612 | struct rdac_dh_data *h = sdev->handler_data; |
fbd7ab3e | 613 | int err = SCSI_DH_OK; |
3425fbfe | 614 | int act = 0; |
fbd7ab3e | 615 | |
ca9f0089 HR |
616 | err = check_ownership(sdev, h); |
617 | if (err != SCSI_DH_OK) | |
fbd7ab3e | 618 | goto done; |
fbd7ab3e | 619 | |
3425fbfe MB |
620 | switch (h->mode) { |
621 | case RDAC_MODE: | |
622 | if (h->lun_state == RDAC_LUN_UNOWNED) | |
623 | act = 1; | |
624 | break; | |
625 | case RDAC_MODE_IOSHIP: | |
626 | if ((h->lun_state == RDAC_LUN_UNOWNED) && | |
627 | (h->preferred == RDAC_PREFERRED)) | |
628 | act = 1; | |
629 | break; | |
630 | default: | |
631 | break; | |
632 | } | |
633 | ||
634 | if (act) { | |
970f3f47 CS |
635 | err = queue_mode_select(sdev, fn, data); |
636 | if (err == SCSI_DH_OK) | |
637 | return 0; | |
638 | } | |
fbd7ab3e | 639 | done: |
3ae31f6a CS |
640 | if (fn) |
641 | fn(data, err); | |
642 | return 0; | |
fbd7ab3e CS |
643 | } |
644 | ||
4c1cb67c | 645 | static blk_status_t rdac_prep_fn(struct scsi_device *sdev, struct request *req) |
fbd7ab3e | 646 | { |
ee14c674 | 647 | struct rdac_dh_data *h = sdev->handler_data; |
fbd7ab3e CS |
648 | |
649 | if (h->state != RDAC_STATE_ACTIVE) { | |
e8064021 | 650 | req->rq_flags |= RQF_QUIET; |
4c1cb67c | 651 | return BLK_STS_IOERR; |
fbd7ab3e | 652 | } |
fbd7ab3e | 653 | |
4c1cb67c | 654 | return BLK_STS_OK; |
fbd7ab3e CS |
655 | } |
656 | ||
657 | static int rdac_check_sense(struct scsi_device *sdev, | |
658 | struct scsi_sense_hdr *sense_hdr) | |
659 | { | |
ee14c674 | 660 | struct rdac_dh_data *h = sdev->handler_data; |
dd784edc MB |
661 | |
662 | RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, " | |
663 | "I/O returned with sense %02x/%02x/%02x", | |
664 | (char *) h->ctlr->array_name, h->ctlr->index, | |
665 | sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq); | |
666 | ||
fbd7ab3e CS |
667 | switch (sense_hdr->sense_key) { |
668 | case NOT_READY: | |
8f032263 CV |
669 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01) |
670 | /* LUN Not Ready - Logical Unit Not Ready and is in | |
671 | * the process of becoming ready | |
672 | * Just retry. | |
673 | */ | |
674 | return ADD_TO_MLQUEUE; | |
fbd7ab3e CS |
675 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81) |
676 | /* LUN Not Ready - Storage firmware incompatible | |
677 | * Manual code synchonisation required. | |
678 | * | |
679 | * Nothing we can do here. Try to bypass the path. | |
680 | */ | |
681 | return SUCCESS; | |
682 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1) | |
683 | /* LUN Not Ready - Quiescense in progress | |
684 | * | |
685 | * Just retry and wait. | |
686 | */ | |
c7dbb627 | 687 | return ADD_TO_MLQUEUE; |
af50bb99 CV |
688 | if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02) |
689 | /* LUN Not Ready - Quiescense in progress | |
690 | * or has been achieved | |
691 | * Just retry. | |
692 | */ | |
693 | return ADD_TO_MLQUEUE; | |
fbd7ab3e CS |
694 | break; |
695 | case ILLEGAL_REQUEST: | |
696 | if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) { | |
697 | /* Invalid Request - Current Logical Unit Ownership. | |
698 | * Controller is not the current owner of the LUN, | |
699 | * Fail the path, so that the other path be used. | |
700 | */ | |
701 | h->state = RDAC_STATE_PASSIVE; | |
702 | return SUCCESS; | |
703 | } | |
704 | break; | |
705 | case UNIT_ATTENTION: | |
706 | if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00) | |
707 | /* | |
708 | * Power On, Reset, or Bus Device Reset, just retry. | |
ea41e415 CV |
709 | */ |
710 | return ADD_TO_MLQUEUE; | |
711 | if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02) | |
712 | /* | |
713 | * Quiescence in progress , just retry. | |
fbd7ab3e | 714 | */ |
c7dbb627 | 715 | return ADD_TO_MLQUEUE; |
fbd7ab3e CS |
716 | break; |
717 | } | |
718 | /* success just means we do not care what scsi-ml does */ | |
719 | return SCSI_RETURN_NOT_HANDLED; | |
720 | } | |
721 | ||
ee14c674 | 722 | static int rdac_bus_attach(struct scsi_device *sdev) |
fbd7ab3e | 723 | { |
fbd7ab3e | 724 | struct rdac_dh_data *h; |
ca9f0089 | 725 | int err; |
1527666e | 726 | char array_name[ARRAY_LABEL_LEN]; |
a53becc9 | 727 | char array_id[UNIQUE_ID_LEN]; |
fbd7ab3e | 728 | |
cd37743f | 729 | h = kzalloc(sizeof(*h) , GFP_KERNEL); |
1d520328 | 730 | if (!h) |
2a8f7a03 | 731 | return SCSI_DH_NOMEM; |
765cbc6d HR |
732 | h->lun = UNINITIALIZED_LUN; |
733 | h->state = RDAC_STATE_ACTIVE; | |
ca9f0089 | 734 | |
a53becc9 | 735 | err = get_lun_info(sdev, h, array_name, array_id); |
ca9f0089 HR |
736 | if (err != SCSI_DH_OK) |
737 | goto failed; | |
738 | ||
a53becc9 | 739 | err = initialize_controller(sdev, h, array_name, array_id); |
ca9f0089 HR |
740 | if (err != SCSI_DH_OK) |
741 | goto failed; | |
742 | ||
87b79a53 MB |
743 | err = check_ownership(sdev, h); |
744 | if (err != SCSI_DH_OK) | |
745 | goto clean_ctlr; | |
746 | ||
747 | err = set_mode_select(sdev, h); | |
748 | if (err != SCSI_DH_OK) | |
749 | goto clean_ctlr; | |
750 | ||
ca9f0089 | 751 | sdev_printk(KERN_NOTICE, sdev, |
eebe9b96 MB |
752 | "%s: LUN %d (%s) (%s)\n", |
753 | RDAC_NAME, h->lun, mode[(int)h->mode], | |
754 | lun_state[(int)h->lun_state]); | |
fbd7ab3e | 755 | |
ee14c674 | 756 | sdev->handler_data = h; |
2a8f7a03 | 757 | return SCSI_DH_OK; |
ca9f0089 | 758 | |
87b79a53 | 759 | clean_ctlr: |
3569e537 | 760 | spin_lock(&list_lock); |
87b79a53 | 761 | kref_put(&h->ctlr->kref, release_controller); |
3569e537 | 762 | spin_unlock(&list_lock); |
87b79a53 | 763 | |
ca9f0089 | 764 | failed: |
cd37743f | 765 | kfree(h); |
2a8f7a03 | 766 | return err; |
fbd7ab3e CS |
767 | } |
768 | ||
765cbc6d HR |
769 | static void rdac_bus_detach( struct scsi_device *sdev ) |
770 | { | |
ee14c674 | 771 | struct rdac_dh_data *h = sdev->handler_data; |
765cbc6d | 772 | |
3569e537 MB |
773 | if (h->ctlr && h->ctlr->ms_queued) |
774 | flush_workqueue(kmpath_rdacd); | |
775 | ||
3569e537 | 776 | spin_lock(&list_lock); |
1a5dc166 HR |
777 | if (h->ctlr) { |
778 | list_del_rcu(&h->node); | |
779 | h->sdev = NULL; | |
765cbc6d | 780 | kref_put(&h->ctlr->kref, release_controller); |
1a5dc166 | 781 | } |
3569e537 | 782 | spin_unlock(&list_lock); |
ee14c674 | 783 | sdev->handler_data = NULL; |
cd37743f | 784 | kfree(h); |
765cbc6d HR |
785 | } |
786 | ||
1d520328 CH |
787 | static struct scsi_device_handler rdac_dh = { |
788 | .name = RDAC_NAME, | |
789 | .module = THIS_MODULE, | |
790 | .prep_fn = rdac_prep_fn, | |
791 | .check_sense = rdac_check_sense, | |
792 | .attach = rdac_bus_attach, | |
793 | .detach = rdac_bus_detach, | |
794 | .activate = rdac_activate, | |
1d520328 | 795 | }; |
765cbc6d | 796 | |
fbd7ab3e CS |
797 | static int __init rdac_init(void) |
798 | { | |
799 | int r; | |
800 | ||
801 | r = scsi_register_device_handler(&rdac_dh); | |
970f3f47 | 802 | if (r != 0) { |
fbd7ab3e | 803 | printk(KERN_ERR "Failed to register scsi device handler."); |
970f3f47 CS |
804 | goto done; |
805 | } | |
806 | ||
807 | /* | |
808 | * Create workqueue to handle mode selects for rdac | |
809 | */ | |
810 | kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd"); | |
811 | if (!kmpath_rdacd) { | |
812 | scsi_unregister_device_handler(&rdac_dh); | |
813 | printk(KERN_ERR "kmpath_rdacd creation failed.\n"); | |
9fc397fc RW |
814 | |
815 | r = -EINVAL; | |
970f3f47 CS |
816 | } |
817 | done: | |
fbd7ab3e CS |
818 | return r; |
819 | } | |
820 | ||
821 | static void __exit rdac_exit(void) | |
822 | { | |
970f3f47 | 823 | destroy_workqueue(kmpath_rdacd); |
fbd7ab3e CS |
824 | scsi_unregister_device_handler(&rdac_dh); |
825 | } | |
826 | ||
827 | module_init(rdac_init); | |
828 | module_exit(rdac_exit); | |
829 | ||
5f7a6433 | 830 | MODULE_DESCRIPTION("Multipath LSI/Engenio/NetApp E-Series RDAC driver"); |
fbd7ab3e | 831 | MODULE_AUTHOR("Mike Christie, Chandra Seetharaman"); |
a0b990c6 | 832 | MODULE_VERSION("01.00.0000.0000"); |
fbd7ab3e | 833 | MODULE_LICENSE("GPL"); |