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Merge remote-tracking branch 's5p/for-next'
[linux-2.6/next.git] / drivers / scsi / device_handler / scsi_dh_rdac.c
blob27c9d65d54a902443ff5b32fd4772666951c15dd
1 /*
2 * Engenio/LSI RDAC SCSI Device Handler
3 *
4 * Copyright (C) 2005 Mike Christie. All rights reserved.
5 * Copyright (C) Chandra Seetharaman, IBM Corp. 2007
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 *
21 */
22 #include <scsi/scsi.h>
23 #include <scsi/scsi_eh.h>
24 #include <scsi/scsi_dh.h>
25 #include <linux/workqueue.h>
26 #include <linux/slab.h>
27
28 #define RDAC_NAME "rdac"
29 #define RDAC_RETRY_COUNT 5
30
31 /*
32 * LSI mode page stuff
33 *
34 * These struct definitions and the forming of the
35 * mode page were taken from the LSI RDAC 2.4 GPL'd
36 * driver, and then converted to Linux conventions.
37 */
38 #define RDAC_QUIESCENCE_TIME 20
39 /*
40 * Page Codes
41 */
42 #define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c
43
44 /*
45 * Controller modes definitions
46 */
47 #define RDAC_MODE_TRANSFER_SPECIFIED_LUNS 0x02
48
49 /*
50 * RDAC Options field
51 */
52 #define RDAC_FORCED_QUIESENCE 0x02
53
54 #define RDAC_TIMEOUT (60 * HZ)
55 #define RDAC_RETRIES 3
56
57 struct rdac_mode_6_hdr {
58 u8 data_len;
59 u8 medium_type;
60 u8 device_params;
61 u8 block_desc_len;
62 };
63
64 struct rdac_mode_10_hdr {
65 u16 data_len;
66 u8 medium_type;
67 u8 device_params;
68 u16 reserved;
69 u16 block_desc_len;
70 };
71
72 struct rdac_mode_common {
73 u8 controller_serial[16];
74 u8 alt_controller_serial[16];
75 u8 rdac_mode[2];
76 u8 alt_rdac_mode[2];
77 u8 quiescence_timeout;
78 u8 rdac_options;
79 };
80
81 struct rdac_pg_legacy {
82 struct rdac_mode_6_hdr hdr;
83 u8 page_code;
84 u8 page_len;
85 struct rdac_mode_common common;
86 #define MODE6_MAX_LUN 32
87 u8 lun_table[MODE6_MAX_LUN];
88 u8 reserved2[32];
89 u8 reserved3;
90 u8 reserved4;
91 };
92
93 struct rdac_pg_expanded {
94 struct rdac_mode_10_hdr hdr;
95 u8 page_code;
96 u8 subpage_code;
97 u8 page_len[2];
98 struct rdac_mode_common common;
99 u8 lun_table[256];
100 u8 reserved3;
101 u8 reserved4;
102 };
103
104 struct c9_inquiry {
105 u8 peripheral_info;
106 u8 page_code; /* 0xC9 */
107 u8 reserved1;
108 u8 page_len;
109 u8 page_id[4]; /* "vace" */
110 u8 avte_cvp;
111 u8 path_prio;
112 u8 reserved2[38];
113 };
114
115 #define SUBSYS_ID_LEN 16
116 #define SLOT_ID_LEN 2
117 #define ARRAY_LABEL_LEN 31
118
119 struct c4_inquiry {
120 u8 peripheral_info;
121 u8 page_code; /* 0xC4 */
122 u8 reserved1;
123 u8 page_len;
124 u8 page_id[4]; /* "subs" */
125 u8 subsys_id[SUBSYS_ID_LEN];
126 u8 revision[4];
127 u8 slot_id[SLOT_ID_LEN];
128 u8 reserved[2];
129 };
130
131 #define UNIQUE_ID_LEN 16
132 struct c8_inquiry {
133 u8 peripheral_info;
134 u8 page_code; /* 0xC8 */
135 u8 reserved1;
136 u8 page_len;
137 u8 page_id[4]; /* "edid" */
138 u8 reserved2[3];
139 u8 vol_uniq_id_len;
140 u8 vol_uniq_id[16];
141 u8 vol_user_label_len;
142 u8 vol_user_label[60];
143 u8 array_uniq_id_len;
144 u8 array_unique_id[UNIQUE_ID_LEN];
145 u8 array_user_label_len;
146 u8 array_user_label[60];
147 u8 lun[8];
148 };
149
150 struct rdac_controller {
151 u8 array_id[UNIQUE_ID_LEN];
152 int use_ms10;
153 struct kref kref;
154 struct list_head node; /* list of all controllers */
155 union {
156 struct rdac_pg_legacy legacy;
157 struct rdac_pg_expanded expanded;
158 } mode_select;
159 u8 index;
160 u8 array_name[ARRAY_LABEL_LEN];
161 struct Scsi_Host *host;
162 spinlock_t ms_lock;
163 int ms_queued;
164 struct work_struct ms_work;
165 struct scsi_device *ms_sdev;
166 struct list_head ms_head;
167 };
168
169 struct c2_inquiry {
170 u8 peripheral_info;
171 u8 page_code; /* 0xC2 */
172 u8 reserved1;
173 u8 page_len;
174 u8 page_id[4]; /* "swr4" */
175 u8 sw_version[3];
176 u8 sw_date[3];
177 u8 features_enabled;
178 u8 max_lun_supported;
179 u8 partitions[239]; /* Total allocation length should be 0xFF */
180 };
181
182 struct rdac_dh_data {
183 struct rdac_controller *ctlr;
184 #define UNINITIALIZED_LUN (1 << 8)
185 unsigned lun;
186
187 #define RDAC_MODE 0
188 #define RDAC_MODE_AVT 1
189 #define RDAC_MODE_IOSHIP 2
190 unsigned char mode;
191
192 #define RDAC_STATE_ACTIVE 0
193 #define RDAC_STATE_PASSIVE 1
194 unsigned char state;
195
196 #define RDAC_LUN_UNOWNED 0
197 #define RDAC_LUN_OWNED 1
198 char lun_state;
199
200 #define RDAC_PREFERRED 0
201 #define RDAC_NON_PREFERRED 1
202 char preferred;
203
204 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
205 union {
206 struct c2_inquiry c2;
207 struct c4_inquiry c4;
208 struct c8_inquiry c8;
209 struct c9_inquiry c9;
210 } inq;
211 };
212
213 static const char *mode[] = {
214 "RDAC",
215 "AVT",
216 "IOSHIP",
217 };
218 static const char *lun_state[] =
219 {
220 "unowned",
221 "owned",
222 };
223
224 struct rdac_queue_data {
225 struct list_head entry;
226 struct rdac_dh_data *h;
227 activate_complete callback_fn;
228 void *callback_data;
229 };
230
231 static LIST_HEAD(ctlr_list);
232 static DEFINE_SPINLOCK(list_lock);
233 static struct workqueue_struct *kmpath_rdacd;
234 static void send_mode_select(struct work_struct *work);
235
236 /*
237 * module parameter to enable rdac debug logging.
238 * 2 bits for each type of logging, only two types defined for now
239 * Can be enhanced if required at later point
240 */
241 static int rdac_logging = 1;
242 module_param(rdac_logging, int, S_IRUGO|S_IWUSR);
243 MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, "
244 "Default is 1 - failover logging enabled, "
245 "set it to 0xF to enable all the logs");
246
247 #define RDAC_LOG_FAILOVER 0
248 #define RDAC_LOG_SENSE 2
249
250 #define RDAC_LOG_BITS 2
251
252 #define RDAC_LOG_LEVEL(SHIFT) \
253 ((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1))
254
255 #define RDAC_LOG(SHIFT, sdev, f, arg...) \
256 do { \
257 if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \
258 sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \
259 } while (0);
260
261 static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev)
262 {
263 struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
264 BUG_ON(scsi_dh_data == NULL);
265 return ((struct rdac_dh_data *) scsi_dh_data->buf);
266 }
267
268 static struct request *get_rdac_req(struct scsi_device *sdev,
269 void *buffer, unsigned buflen, int rw)
270 {
271 struct request *rq;
272 struct request_queue *q = sdev->request_queue;
273
274 rq = blk_get_request(q, rw, GFP_NOIO);
275
276 if (!rq) {
277 sdev_printk(KERN_INFO, sdev,
278 "get_rdac_req: blk_get_request failed.\n");
279 return NULL;
280 }
281
282 if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) {
283 blk_put_request(rq);
284 sdev_printk(KERN_INFO, sdev,
285 "get_rdac_req: blk_rq_map_kern failed.\n");
286 return NULL;
287 }
288
289 rq->cmd_type = REQ_TYPE_BLOCK_PC;
290 rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
291 REQ_FAILFAST_DRIVER;
292 rq->retries = RDAC_RETRIES;
293 rq->timeout = RDAC_TIMEOUT;
294
295 return rq;
296 }
297
298 static struct request *rdac_failover_get(struct scsi_device *sdev,
299 struct rdac_dh_data *h, struct list_head *list)
300 {
301 struct request *rq;
302 struct rdac_mode_common *common;
303 unsigned data_size;
304 struct rdac_queue_data *qdata;
305 u8 *lun_table;
306
307 if (h->ctlr->use_ms10) {
308 struct rdac_pg_expanded *rdac_pg;
309
310 data_size = sizeof(struct rdac_pg_expanded);
311 rdac_pg = &h->ctlr->mode_select.expanded;
312 memset(rdac_pg, 0, data_size);
313 common = &rdac_pg->common;
314 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40;
315 rdac_pg->subpage_code = 0x1;
316 rdac_pg->page_len[0] = 0x01;
317 rdac_pg->page_len[1] = 0x28;
318 lun_table = rdac_pg->lun_table;
319 } else {
320 struct rdac_pg_legacy *rdac_pg;
321
322 data_size = sizeof(struct rdac_pg_legacy);
323 rdac_pg = &h->ctlr->mode_select.legacy;
324 memset(rdac_pg, 0, data_size);
325 common = &rdac_pg->common;
326 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER;
327 rdac_pg->page_len = 0x68;
328 lun_table = rdac_pg->lun_table;
329 }
330 common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS;
331 common->quiescence_timeout = RDAC_QUIESCENCE_TIME;
332 common->rdac_options = RDAC_FORCED_QUIESENCE;
333
334 list_for_each_entry(qdata, list, entry) {
335 lun_table[qdata->h->lun] = 0x81;
336 }
337
338 /* get request for block layer packet command */
339 rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE);
340 if (!rq)
341 return NULL;
342
343 /* Prepare the command. */
344 if (h->ctlr->use_ms10) {
345 rq->cmd[0] = MODE_SELECT_10;
346 rq->cmd[7] = data_size >> 8;
347 rq->cmd[8] = data_size & 0xff;
348 } else {
349 rq->cmd[0] = MODE_SELECT;
350 rq->cmd[4] = data_size;
351 }
352 rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
353
354 rq->sense = h->sense;
355 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
356 rq->sense_len = 0;
357
358 return rq;
359 }
360
361 static void release_controller(struct kref *kref)
362 {
363 struct rdac_controller *ctlr;
364 ctlr = container_of(kref, struct rdac_controller, kref);
365
366 flush_workqueue(kmpath_rdacd);
367 spin_lock(&list_lock);
368 list_del(&ctlr->node);
369 spin_unlock(&list_lock);
370 kfree(ctlr);
371 }
372
373 static struct rdac_controller *get_controller(int index, char *array_name,
374 u8 *array_id, struct scsi_device *sdev)
375 {
376 struct rdac_controller *ctlr, *tmp;
377
378 spin_lock(&list_lock);
379
380 list_for_each_entry(tmp, &ctlr_list, node) {
381 if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) &&
382 (tmp->index == index) &&
383 (tmp->host == sdev->host)) {
384 kref_get(&tmp->kref);
385 spin_unlock(&list_lock);
386 return tmp;
387 }
388 }
389 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
390 if (!ctlr)
391 goto done;
392
393 /* initialize fields of controller */
394 memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN);
395 ctlr->index = index;
396 ctlr->host = sdev->host;
397 memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN);
398
399 kref_init(&ctlr->kref);
400 ctlr->use_ms10 = -1;
401 ctlr->ms_queued = 0;
402 ctlr->ms_sdev = NULL;
403 spin_lock_init(&ctlr->ms_lock);
404 INIT_WORK(&ctlr->ms_work, send_mode_select);
405 INIT_LIST_HEAD(&ctlr->ms_head);
406 list_add(&ctlr->node, &ctlr_list);
407 done:
408 spin_unlock(&list_lock);
409 return ctlr;
410 }
411
412 static int submit_inquiry(struct scsi_device *sdev, int page_code,
413 unsigned int len, struct rdac_dh_data *h)
414 {
415 struct request *rq;
416 struct request_queue *q = sdev->request_queue;
417 int err = SCSI_DH_RES_TEMP_UNAVAIL;
418
419 rq = get_rdac_req(sdev, &h->inq, len, READ);
420 if (!rq)
421 goto done;
422
423 /* Prepare the command. */
424 rq->cmd[0] = INQUIRY;
425 rq->cmd[1] = 1;
426 rq->cmd[2] = page_code;
427 rq->cmd[4] = len;
428 rq->cmd_len = COMMAND_SIZE(INQUIRY);
429
430 rq->sense = h->sense;
431 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
432 rq->sense_len = 0;
433
434 err = blk_execute_rq(q, NULL, rq, 1);
435 if (err == -EIO)
436 err = SCSI_DH_IO;
437
438 blk_put_request(rq);
439 done:
440 return err;
441 }
442
443 static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h,
444 char *array_name, u8 *array_id)
445 {
446 int err, i;
447 struct c8_inquiry *inqp;
448
449 err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h);
450 if (err == SCSI_DH_OK) {
451 inqp = &h->inq.c8;
452 if (inqp->page_code != 0xc8)
453 return SCSI_DH_NOSYS;
454 if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' ||
455 inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd')
456 return SCSI_DH_NOSYS;
457 h->lun = inqp->lun[7]; /* Uses only the last byte */
458
459 for(i=0; i<ARRAY_LABEL_LEN-1; ++i)
460 *(array_name+i) = inqp->array_user_label[(2*i)+1];
461
462 *(array_name+ARRAY_LABEL_LEN-1) = '\0';
463 memset(array_id, 0, UNIQUE_ID_LEN);
464 memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len);
465 }
466 return err;
467 }
468
469 static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h)
470 {
471 int err;
472 struct c9_inquiry *inqp;
473
474 h->state = RDAC_STATE_ACTIVE;
475 err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h);
476 if (err == SCSI_DH_OK) {
477 inqp = &h->inq.c9;
478 /* detect the operating mode */
479 if ((inqp->avte_cvp >> 5) & 0x1)
480 h->mode = RDAC_MODE_IOSHIP; /* LUN in IOSHIP mode */
481 else if (inqp->avte_cvp >> 7)
482 h->mode = RDAC_MODE_AVT; /* LUN in AVT mode */
483 else
484 h->mode = RDAC_MODE; /* LUN in RDAC mode */
485
486 /* Update ownership */
487 if (inqp->avte_cvp & 0x1)
488 h->lun_state = RDAC_LUN_OWNED;
489 else {
490 h->lun_state = RDAC_LUN_UNOWNED;
491 if (h->mode == RDAC_MODE)
492 h->state = RDAC_STATE_PASSIVE;
493 }
494
495 /* Update path prio*/
496 if (inqp->path_prio & 0x1)
497 h->preferred = RDAC_PREFERRED;
498 else
499 h->preferred = RDAC_NON_PREFERRED;
500 }
501
502 return err;
503 }
504
505 static int initialize_controller(struct scsi_device *sdev,
506 struct rdac_dh_data *h, char *array_name, u8 *array_id)
507 {
508 int err, index;
509 struct c4_inquiry *inqp;
510
511 err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h);
512 if (err == SCSI_DH_OK) {
513 inqp = &h->inq.c4;
514 /* get the controller index */
515 if (inqp->slot_id[1] == 0x31)
516 index = 0;
517 else
518 index = 1;
519 h->ctlr = get_controller(index, array_name, array_id, sdev);
520 if (!h->ctlr)
521 err = SCSI_DH_RES_TEMP_UNAVAIL;
522 }
523 return err;
524 }
525
526 static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
527 {
528 int err;
529 struct c2_inquiry *inqp;
530
531 err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h);
532 if (err == SCSI_DH_OK) {
533 inqp = &h->inq.c2;
534 /*
535 * If more than MODE6_MAX_LUN luns are supported, use
536 * mode select 10
537 */
538 if (inqp->max_lun_supported >= MODE6_MAX_LUN)
539 h->ctlr->use_ms10 = 1;
540 else
541 h->ctlr->use_ms10 = 0;
542 }
543 return err;
544 }
545
546 static int mode_select_handle_sense(struct scsi_device *sdev,
547 unsigned char *sensebuf)
548 {
549 struct scsi_sense_hdr sense_hdr;
550 int err = SCSI_DH_IO, ret;
551 struct rdac_dh_data *h = get_rdac_data(sdev);
552
553 ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr);
554 if (!ret)
555 goto done;
556
557 switch (sense_hdr.sense_key) {
558 case NO_SENSE:
559 case ABORTED_COMMAND:
560 case UNIT_ATTENTION:
561 err = SCSI_DH_RETRY;
562 break;
563 case NOT_READY:
564 if (sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x01)
565 /* LUN Not Ready and is in the Process of Becoming
566 * Ready
567 */
568 err = SCSI_DH_RETRY;
569 break;
570 case ILLEGAL_REQUEST:
571 if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36)
572 /*
573 * Command Lock contention
574 */
575 err = SCSI_DH_RETRY;
576 break;
577 default:
578 break;
579 }
580
581 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
582 "MODE_SELECT returned with sense %02x/%02x/%02x",
583 (char *) h->ctlr->array_name, h->ctlr->index,
584 sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq);
585
586 done:
587 return err;
588 }
589
590 static void send_mode_select(struct work_struct *work)
591 {
592 struct rdac_controller *ctlr =
593 container_of(work, struct rdac_controller, ms_work);
594 struct request *rq;
595 struct scsi_device *sdev = ctlr->ms_sdev;
596 struct rdac_dh_data *h = get_rdac_data(sdev);
597 struct request_queue *q = sdev->request_queue;
598 int err, retry_cnt = RDAC_RETRY_COUNT;
599 struct rdac_queue_data *tmp, *qdata;
600 LIST_HEAD(list);
601
602 spin_lock(&ctlr->ms_lock);
603 list_splice_init(&ctlr->ms_head, &list);
604 ctlr->ms_queued = 0;
605 ctlr->ms_sdev = NULL;
606 spin_unlock(&ctlr->ms_lock);
607
608 retry:
609 err = SCSI_DH_RES_TEMP_UNAVAIL;
610 rq = rdac_failover_get(sdev, h, &list);
611 if (!rq)
612 goto done;
613
614 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
615 "%s MODE_SELECT command",
616 (char *) h->ctlr->array_name, h->ctlr->index,
617 (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying");
618
619 err = blk_execute_rq(q, NULL, rq, 1);
620 blk_put_request(rq);
621 if (err != SCSI_DH_OK) {
622 err = mode_select_handle_sense(sdev, h->sense);
623 if (err == SCSI_DH_RETRY && retry_cnt--)
624 goto retry;
625 }
626 if (err == SCSI_DH_OK) {
627 h->state = RDAC_STATE_ACTIVE;
628 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
629 "MODE_SELECT completed",
630 (char *) h->ctlr->array_name, h->ctlr->index);
631 }
632
633 done:
634 list_for_each_entry_safe(qdata, tmp, &list, entry) {
635 list_del(&qdata->entry);
636 if (err == SCSI_DH_OK)
637 qdata->h->state = RDAC_STATE_ACTIVE;
638 if (qdata->callback_fn)
639 qdata->callback_fn(qdata->callback_data, err);
640 kfree(qdata);
641 }
642 return;
643 }
644
645 static int queue_mode_select(struct scsi_device *sdev,
646 activate_complete fn, void *data)
647 {
648 struct rdac_queue_data *qdata;
649 struct rdac_controller *ctlr;
650
651 qdata = kzalloc(sizeof(*qdata), GFP_KERNEL);
652 if (!qdata)
653 return SCSI_DH_RETRY;
654
655 qdata->h = get_rdac_data(sdev);
656 qdata->callback_fn = fn;
657 qdata->callback_data = data;
658
659 ctlr = qdata->h->ctlr;
660 spin_lock(&ctlr->ms_lock);
661 list_add_tail(&qdata->entry, &ctlr->ms_head);
662 if (!ctlr->ms_queued) {
663 ctlr->ms_queued = 1;
664 ctlr->ms_sdev = sdev;
665 queue_work(kmpath_rdacd, &ctlr->ms_work);
666 }
667 spin_unlock(&ctlr->ms_lock);
668 return SCSI_DH_OK;
669 }
670
671 static int rdac_activate(struct scsi_device *sdev,
672 activate_complete fn, void *data)
673 {
674 struct rdac_dh_data *h = get_rdac_data(sdev);
675 int err = SCSI_DH_OK;
676 int act = 0;
677
678 err = check_ownership(sdev, h);
679 if (err != SCSI_DH_OK)
680 goto done;
681
682 switch (h->mode) {
683 case RDAC_MODE:
684 if (h->lun_state == RDAC_LUN_UNOWNED)
685 act = 1;
686 break;
687 case RDAC_MODE_IOSHIP:
688 if ((h->lun_state == RDAC_LUN_UNOWNED) &&
689 (h->preferred == RDAC_PREFERRED))
690 act = 1;
691 break;
692 default:
693 break;
694 }
695
696 if (act) {
697 err = queue_mode_select(sdev, fn, data);
698 if (err == SCSI_DH_OK)
699 return 0;
700 }
701 done:
702 if (fn)
703 fn(data, err);
704 return 0;
705 }
706
707 static int rdac_prep_fn(struct scsi_device *sdev, struct request *req)
708 {
709 struct rdac_dh_data *h = get_rdac_data(sdev);
710 int ret = BLKPREP_OK;
711
712 if (h->state != RDAC_STATE_ACTIVE) {
713 ret = BLKPREP_KILL;
714 req->cmd_flags |= REQ_QUIET;
715 }
716 return ret;
717
718 }
719
720 static int rdac_check_sense(struct scsi_device *sdev,
721 struct scsi_sense_hdr *sense_hdr)
722 {
723 struct rdac_dh_data *h = get_rdac_data(sdev);
724
725 RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, "
726 "I/O returned with sense %02x/%02x/%02x",
727 (char *) h->ctlr->array_name, h->ctlr->index,
728 sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
729
730 switch (sense_hdr->sense_key) {
731 case NOT_READY:
732 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
733 /* LUN Not Ready - Logical Unit Not Ready and is in
734 * the process of becoming ready
735 * Just retry.
736 */
737 return ADD_TO_MLQUEUE;
738 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81)
739 /* LUN Not Ready - Storage firmware incompatible
740 * Manual code synchonisation required.
741 *
742 * Nothing we can do here. Try to bypass the path.
743 */
744 return SUCCESS;
745 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1)
746 /* LUN Not Ready - Quiescense in progress
747 *
748 * Just retry and wait.
749 */
750 return ADD_TO_MLQUEUE;
751 if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02)
752 /* LUN Not Ready - Quiescense in progress
753 * or has been achieved
754 * Just retry.
755 */
756 return ADD_TO_MLQUEUE;
757 break;
758 case ILLEGAL_REQUEST:
759 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) {
760 /* Invalid Request - Current Logical Unit Ownership.
761 * Controller is not the current owner of the LUN,
762 * Fail the path, so that the other path be used.
763 */
764 h->state = RDAC_STATE_PASSIVE;
765 return SUCCESS;
766 }
767 break;
768 case UNIT_ATTENTION:
769 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
770 /*
771 * Power On, Reset, or Bus Device Reset, just retry.
772 */
773 return ADD_TO_MLQUEUE;
774 if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02)
775 /*
776 * Quiescence in progress , just retry.
777 */
778 return ADD_TO_MLQUEUE;
779 break;
780 }
781 /* success just means we do not care what scsi-ml does */
782 return SCSI_RETURN_NOT_HANDLED;
783 }
784
785 static const struct scsi_dh_devlist rdac_dev_list[] = {
786 {"IBM", "1722"},
787 {"IBM", "1724"},
788 {"IBM", "1726"},
789 {"IBM", "1742"},
790 {"IBM", "1745"},
791 {"IBM", "1746"},
792 {"IBM", "1814"},
793 {"IBM", "1815"},
794 {"IBM", "1818"},
795 {"IBM", "3526"},
796 {"SGI", "TP9400"},
797 {"SGI", "TP9500"},
798 {"SGI", "IS"},
799 {"STK", "OPENstorage D280"},
800 {"SUN", "CSM200_R"},
801 {"SUN", "LCSM100_I"},
802 {"SUN", "LCSM100_S"},
803 {"SUN", "LCSM100_E"},
804 {"SUN", "LCSM100_F"},
805 {"DELL", "MD3000"},
806 {"DELL", "MD3000i"},
807 {"DELL", "MD32xx"},
808 {"DELL", "MD32xxi"},
809 {"DELL", "MD36xxi"},
810 {"DELL", "MD36xxf"},
811 {"LSI", "INF-01-00"},
812 {"ENGENIO", "INF-01-00"},
813 {"STK", "FLEXLINE 380"},
814 {"SUN", "CSM100_R_FC"},
815 {"SUN", "STK6580_6780"},
816 {"SUN", "SUN_6180"},
817 {NULL, NULL},
818 };
819
820 static int rdac_bus_attach(struct scsi_device *sdev);
821 static void rdac_bus_detach(struct scsi_device *sdev);
822
823 static struct scsi_device_handler rdac_dh = {
824 .name = RDAC_NAME,
825 .module = THIS_MODULE,
826 .devlist = rdac_dev_list,
827 .prep_fn = rdac_prep_fn,
828 .check_sense = rdac_check_sense,
829 .attach = rdac_bus_attach,
830 .detach = rdac_bus_detach,
831 .activate = rdac_activate,
832 };
833
834 static int rdac_bus_attach(struct scsi_device *sdev)
835 {
836 struct scsi_dh_data *scsi_dh_data;
837 struct rdac_dh_data *h;
838 unsigned long flags;
839 int err;
840 char array_name[ARRAY_LABEL_LEN];
841 char array_id[UNIQUE_ID_LEN];
842
843 scsi_dh_data = kzalloc(sizeof(*scsi_dh_data)
844 + sizeof(*h) , GFP_KERNEL);
845 if (!scsi_dh_data) {
846 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
847 RDAC_NAME);
848 return 0;
849 }
850
851 scsi_dh_data->scsi_dh = &rdac_dh;
852 h = (struct rdac_dh_data *) scsi_dh_data->buf;
853 h->lun = UNINITIALIZED_LUN;
854 h->state = RDAC_STATE_ACTIVE;
855
856 err = get_lun_info(sdev, h, array_name, array_id);
857 if (err != SCSI_DH_OK)
858 goto failed;
859
860 err = initialize_controller(sdev, h, array_name, array_id);
861 if (err != SCSI_DH_OK)
862 goto failed;
863
864 err = check_ownership(sdev, h);
865 if (err != SCSI_DH_OK)
866 goto clean_ctlr;
867
868 err = set_mode_select(sdev, h);
869 if (err != SCSI_DH_OK)
870 goto clean_ctlr;
871
872 if (!try_module_get(THIS_MODULE))
873 goto clean_ctlr;
874
875 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
876 sdev->scsi_dh_data = scsi_dh_data;
877 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
878
879 sdev_printk(KERN_NOTICE, sdev,
880 "%s: LUN %d (%s) (%s)\n",
881 RDAC_NAME, h->lun, mode[(int)h->mode],
882 lun_state[(int)h->lun_state]);
883
884 return 0;
885
886 clean_ctlr:
887 kref_put(&h->ctlr->kref, release_controller);
888
889 failed:
890 kfree(scsi_dh_data);
891 sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
892 RDAC_NAME);
893 return -EINVAL;
894 }
895
896 static void rdac_bus_detach( struct scsi_device *sdev )
897 {
898 struct scsi_dh_data *scsi_dh_data;
899 struct rdac_dh_data *h;
900 unsigned long flags;
901
902 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
903 scsi_dh_data = sdev->scsi_dh_data;
904 sdev->scsi_dh_data = NULL;
905 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
906
907 h = (struct rdac_dh_data *) scsi_dh_data->buf;
908 if (h->ctlr)
909 kref_put(&h->ctlr->kref, release_controller);
910 kfree(scsi_dh_data);
911 module_put(THIS_MODULE);
912 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME);
913 }
914
915
916
917 static int __init rdac_init(void)
918 {
919 int r;
920
921 r = scsi_register_device_handler(&rdac_dh);
922 if (r != 0) {
923 printk(KERN_ERR "Failed to register scsi device handler.");
924 goto done;
925 }
926
927 /*
928 * Create workqueue to handle mode selects for rdac
929 */
930 kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd");
931 if (!kmpath_rdacd) {
932 scsi_unregister_device_handler(&rdac_dh);
933 printk(KERN_ERR "kmpath_rdacd creation failed.\n");
934 }
935 done:
936 return r;
937 }
938
939 static void __exit rdac_exit(void)
940 {
941 destroy_workqueue(kmpath_rdacd);
942 scsi_unregister_device_handler(&rdac_dh);
943 }
944
945 module_init(rdac_init);
946 module_exit(rdac_exit);
947
948 MODULE_DESCRIPTION("Multipath LSI/Engenio RDAC driver");
949 MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
950 MODULE_VERSION("01.00.0000.0000");
951 MODULE_LICENSE("GPL");
linux-next