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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#include <linux/module.h>
28
29#define RDAC_NAME "rdac"
30#define RDAC_RETRY_COUNT 5
31
32
33
34
35
36
37
38
39#define RDAC_QUIESCENCE_TIME 20
40
41
42
43#define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c
44
45
46
47
48#define RDAC_MODE_TRANSFER_SPECIFIED_LUNS 0x02
49
50
51
52
53#define RDAC_FORCED_QUIESENCE 0x02
54
55#define RDAC_TIMEOUT (60 * HZ)
56#define RDAC_RETRIES 3
57
58struct rdac_mode_6_hdr {
59 u8 data_len;
60 u8 medium_type;
61 u8 device_params;
62 u8 block_desc_len;
63};
64
65struct 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
73struct 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
82struct 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
94struct 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
105struct c9_inquiry {
106 u8 peripheral_info;
107 u8 page_code;
108 u8 reserved1;
109 u8 page_len;
110 u8 page_id[4];
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
118#define ARRAY_LABEL_LEN 31
119
120struct c4_inquiry {
121 u8 peripheral_info;
122 u8 page_code;
123 u8 reserved1;
124 u8 page_len;
125 u8 page_id[4];
126 u8 subsys_id[SUBSYS_ID_LEN];
127 u8 revision[4];
128 u8 slot_id[SLOT_ID_LEN];
129 u8 reserved[2];
130};
131
132#define UNIQUE_ID_LEN 16
133struct c8_inquiry {
134 u8 peripheral_info;
135 u8 page_code;
136 u8 reserved1;
137 u8 page_len;
138 u8 page_id[4];
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;
145 u8 array_unique_id[UNIQUE_ID_LEN];
146 u8 array_user_label_len;
147 u8 array_user_label[60];
148 u8 lun[8];
149};
150
151struct rdac_controller {
152 u8 array_id[UNIQUE_ID_LEN];
153 int use_ms10;
154 struct kref kref;
155 struct list_head node;
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];
162 struct Scsi_Host *host;
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
170struct c2_inquiry {
171 u8 peripheral_info;
172 u8 page_code;
173 u8 reserved1;
174 u8 page_len;
175 u8 page_id[4];
176 u8 sw_version[3];
177 u8 sw_date[3];
178 u8 features_enabled;
179 u8 max_lun_supported;
180 u8 partitions[239];
181};
182
183struct rdac_dh_data {
184 struct rdac_controller *ctlr;
185#define UNINITIALIZED_LUN (1 << 8)
186 unsigned lun;
187
188#define RDAC_MODE 0
189#define RDAC_MODE_AVT 1
190#define RDAC_MODE_IOSHIP 2
191 unsigned char mode;
192
193#define RDAC_STATE_ACTIVE 0
194#define RDAC_STATE_PASSIVE 1
195 unsigned char state;
196
197#define RDAC_LUN_UNOWNED 0
198#define RDAC_LUN_OWNED 1
199 char lun_state;
200
201#define RDAC_PREFERRED 0
202#define RDAC_NON_PREFERRED 1
203 char preferred;
204
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
214static const char *mode[] = {
215 "RDAC",
216 "AVT",
217 "IOSHIP",
218};
219static const char *lun_state[] =
220{
221 "unowned",
222 "owned",
223};
224
225struct 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
232static LIST_HEAD(ctlr_list);
233static DEFINE_SPINLOCK(list_lock);
234static struct workqueue_struct *kmpath_rdacd;
235static void send_mode_select(struct work_struct *work);
236
237
238
239
240
241
242static int rdac_logging = 1;
243module_param(rdac_logging, int, S_IRUGO|S_IWUSR);
244MODULE_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...) \
257do { \
258 if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \
259 sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \
260} while (0);
261
262static 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
269static 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;
274
275 rq = blk_get_request(q, rw, GFP_NOIO);
276
277 if (!rq) {
278 sdev_printk(KERN_INFO, sdev,
279 "get_rdac_req: blk_get_request failed.\n");
280 return NULL;
281 }
282
283 if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) {
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
290 rq->cmd_type = REQ_TYPE_BLOCK_PC;
291 rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
292 REQ_FAILFAST_DRIVER;
293 rq->retries = RDAC_RETRIES;
294 rq->timeout = RDAC_TIMEOUT;
295
296 return rq;
297}
298
299static struct request *rdac_failover_get(struct scsi_device *sdev,
300 struct rdac_dh_data *h, struct list_head *list)
301{
302 struct request *rq;
303 struct rdac_mode_common *common;
304 unsigned data_size;
305 struct rdac_queue_data *qdata;
306 u8 *lun_table;
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;
319 lun_table = rdac_pg->lun_table;
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;
329 lun_table = rdac_pg->lun_table;
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
335 list_for_each_entry(qdata, list, entry) {
336 lun_table[qdata->h->lun] = 0x81;
337 }
338
339
340 rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE);
341 if (!rq)
342 return NULL;
343
344
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
355 rq->sense = h->sense;
356 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
357 rq->sense_len = 0;
358
359 return rq;
360}
361
362static void release_controller(struct kref *kref)
363{
364 struct rdac_controller *ctlr;
365 ctlr = container_of(kref, struct rdac_controller, kref);
366
367 list_del(&ctlr->node);
368 kfree(ctlr);
369}
370
371static struct rdac_controller *get_controller(int index, char *array_name,
372 u8 *array_id, struct scsi_device *sdev)
373{
374 struct rdac_controller *ctlr, *tmp;
375
376 list_for_each_entry(tmp, &ctlr_list, node) {
377 if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) &&
378 (tmp->index == index) &&
379 (tmp->host == sdev->host)) {
380 kref_get(&tmp->kref);
381 return tmp;
382 }
383 }
384 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
385 if (!ctlr)
386 return NULL;
387
388
389 memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN);
390 ctlr->index = index;
391 ctlr->host = sdev->host;
392 memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN);
393
394 kref_init(&ctlr->kref);
395 ctlr->use_ms10 = -1;
396 ctlr->ms_queued = 0;
397 ctlr->ms_sdev = NULL;
398 spin_lock_init(&ctlr->ms_lock);
399 INIT_WORK(&ctlr->ms_work, send_mode_select);
400 INIT_LIST_HEAD(&ctlr->ms_head);
401 list_add(&ctlr->node, &ctlr_list);
402
403 return ctlr;
404}
405
406static int submit_inquiry(struct scsi_device *sdev, int page_code,
407 unsigned int len, struct rdac_dh_data *h)
408{
409 struct request *rq;
410 struct request_queue *q = sdev->request_queue;
411 int err = SCSI_DH_RES_TEMP_UNAVAIL;
412
413 rq = get_rdac_req(sdev, &h->inq, len, READ);
414 if (!rq)
415 goto done;
416
417
418 rq->cmd[0] = INQUIRY;
419 rq->cmd[1] = 1;
420 rq->cmd[2] = page_code;
421 rq->cmd[4] = len;
422 rq->cmd_len = COMMAND_SIZE(INQUIRY);
423
424 rq->sense = h->sense;
425 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
426 rq->sense_len = 0;
427
428 err = blk_execute_rq(q, NULL, rq, 1);
429 if (err == -EIO)
430 err = SCSI_DH_IO;
431
432 blk_put_request(rq);
433done:
434 return err;
435}
436
437static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h,
438 char *array_name, u8 *array_id)
439{
440 int err, i;
441 struct c8_inquiry *inqp;
442
443 err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h);
444 if (err == SCSI_DH_OK) {
445 inqp = &h->inq.c8;
446 if (inqp->page_code != 0xc8)
447 return SCSI_DH_NOSYS;
448 if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' ||
449 inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd')
450 return SCSI_DH_NOSYS;
451 h->lun = inqp->lun[7];
452
453 for(i=0; i<ARRAY_LABEL_LEN-1; ++i)
454 *(array_name+i) = inqp->array_user_label[(2*i)+1];
455
456 *(array_name+ARRAY_LABEL_LEN-1) = '\0';
457 memset(array_id, 0, UNIQUE_ID_LEN);
458 memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len);
459 }
460 return err;
461}
462
463static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h)
464{
465 int err;
466 struct c9_inquiry *inqp;
467
468 h->state = RDAC_STATE_ACTIVE;
469 err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h);
470 if (err == SCSI_DH_OK) {
471 inqp = &h->inq.c9;
472
473 if ((inqp->avte_cvp >> 5) & 0x1)
474 h->mode = RDAC_MODE_IOSHIP;
475 else if (inqp->avte_cvp >> 7)
476 h->mode = RDAC_MODE_AVT;
477 else
478 h->mode = RDAC_MODE;
479
480
481 if (inqp->avte_cvp & 0x1)
482 h->lun_state = RDAC_LUN_OWNED;
483 else {
484 h->lun_state = RDAC_LUN_UNOWNED;
485 if (h->mode == RDAC_MODE)
486 h->state = RDAC_STATE_PASSIVE;
487 }
488
489
490 if (inqp->path_prio & 0x1)
491 h->preferred = RDAC_PREFERRED;
492 else
493 h->preferred = RDAC_NON_PREFERRED;
494 }
495
496 return err;
497}
498
499static int initialize_controller(struct scsi_device *sdev,
500 struct rdac_dh_data *h, char *array_name, u8 *array_id)
501{
502 int err, index;
503 struct c4_inquiry *inqp;
504
505 err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h);
506 if (err == SCSI_DH_OK) {
507 inqp = &h->inq.c4;
508
509 if (inqp->slot_id[1] == 0x31)
510 index = 0;
511 else
512 index = 1;
513
514 spin_lock(&list_lock);
515 h->ctlr = get_controller(index, array_name, array_id, sdev);
516 if (!h->ctlr)
517 err = SCSI_DH_RES_TEMP_UNAVAIL;
518 spin_unlock(&list_lock);
519 }
520 return err;
521}
522
523static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
524{
525 int err;
526 struct c2_inquiry *inqp;
527
528 err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h);
529 if (err == SCSI_DH_OK) {
530 inqp = &h->inq.c2;
531
532
533
534
535 if (inqp->max_lun_supported >= MODE6_MAX_LUN)
536 h->ctlr->use_ms10 = 1;
537 else
538 h->ctlr->use_ms10 = 0;
539 }
540 return err;
541}
542
543static int mode_select_handle_sense(struct scsi_device *sdev,
544 unsigned char *sensebuf)
545{
546 struct scsi_sense_hdr sense_hdr;
547 int err = SCSI_DH_IO, ret;
548 struct rdac_dh_data *h = get_rdac_data(sdev);
549
550 ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr);
551 if (!ret)
552 goto done;
553
554 switch (sense_hdr.sense_key) {
555 case NO_SENSE:
556 case ABORTED_COMMAND:
557 case UNIT_ATTENTION:
558 err = SCSI_DH_RETRY;
559 break;
560 case NOT_READY:
561 if (sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x01)
562
563
564
565 err = SCSI_DH_RETRY;
566 break;
567 case ILLEGAL_REQUEST:
568 if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36)
569
570
571
572 err = SCSI_DH_RETRY;
573 break;
574 default:
575 break;
576 }
577
578 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
579 "MODE_SELECT returned with sense %02x/%02x/%02x",
580 (char *) h->ctlr->array_name, h->ctlr->index,
581 sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq);
582
583done:
584 return err;
585}
586
587static void send_mode_select(struct work_struct *work)
588{
589 struct rdac_controller *ctlr =
590 container_of(work, struct rdac_controller, ms_work);
591 struct request *rq;
592 struct scsi_device *sdev = ctlr->ms_sdev;
593 struct rdac_dh_data *h = get_rdac_data(sdev);
594 struct request_queue *q = sdev->request_queue;
595 int err, retry_cnt = RDAC_RETRY_COUNT;
596 struct rdac_queue_data *tmp, *qdata;
597 LIST_HEAD(list);
598
599 spin_lock(&ctlr->ms_lock);
600 list_splice_init(&ctlr->ms_head, &list);
601 ctlr->ms_queued = 0;
602 ctlr->ms_sdev = NULL;
603 spin_unlock(&ctlr->ms_lock);
604
605retry:
606 err = SCSI_DH_RES_TEMP_UNAVAIL;
607 rq = rdac_failover_get(sdev, h, &list);
608 if (!rq)
609 goto done;
610
611 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
612 "%s MODE_SELECT command",
613 (char *) h->ctlr->array_name, h->ctlr->index,
614 (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying");
615
616 err = blk_execute_rq(q, NULL, rq, 1);
617 blk_put_request(rq);
618 if (err != SCSI_DH_OK) {
619 err = mode_select_handle_sense(sdev, h->sense);
620 if (err == SCSI_DH_RETRY && retry_cnt--)
621 goto retry;
622 }
623 if (err == SCSI_DH_OK) {
624 h->state = RDAC_STATE_ACTIVE;
625 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
626 "MODE_SELECT completed",
627 (char *) h->ctlr->array_name, h->ctlr->index);
628 }
629
630done:
631 list_for_each_entry_safe(qdata, tmp, &list, entry) {
632 list_del(&qdata->entry);
633 if (err == SCSI_DH_OK)
634 qdata->h->state = RDAC_STATE_ACTIVE;
635 if (qdata->callback_fn)
636 qdata->callback_fn(qdata->callback_data, err);
637 kfree(qdata);
638 }
639 return;
640}
641
642static int queue_mode_select(struct scsi_device *sdev,
643 activate_complete fn, void *data)
644{
645 struct rdac_queue_data *qdata;
646 struct rdac_controller *ctlr;
647
648 qdata = kzalloc(sizeof(*qdata), GFP_KERNEL);
649 if (!qdata)
650 return SCSI_DH_RETRY;
651
652 qdata->h = get_rdac_data(sdev);
653 qdata->callback_fn = fn;
654 qdata->callback_data = data;
655
656 ctlr = qdata->h->ctlr;
657 spin_lock(&ctlr->ms_lock);
658 list_add_tail(&qdata->entry, &ctlr->ms_head);
659 if (!ctlr->ms_queued) {
660 ctlr->ms_queued = 1;
661 ctlr->ms_sdev = sdev;
662 queue_work(kmpath_rdacd, &ctlr->ms_work);
663 }
664 spin_unlock(&ctlr->ms_lock);
665 return SCSI_DH_OK;
666}
667
668static int rdac_activate(struct scsi_device *sdev,
669 activate_complete fn, void *data)
670{
671 struct rdac_dh_data *h = get_rdac_data(sdev);
672 int err = SCSI_DH_OK;
673 int act = 0;
674
675 err = check_ownership(sdev, h);
676 if (err != SCSI_DH_OK)
677 goto done;
678
679 switch (h->mode) {
680 case RDAC_MODE:
681 if (h->lun_state == RDAC_LUN_UNOWNED)
682 act = 1;
683 break;
684 case RDAC_MODE_IOSHIP:
685 if ((h->lun_state == RDAC_LUN_UNOWNED) &&
686 (h->preferred == RDAC_PREFERRED))
687 act = 1;
688 break;
689 default:
690 break;
691 }
692
693 if (act) {
694 err = queue_mode_select(sdev, fn, data);
695 if (err == SCSI_DH_OK)
696 return 0;
697 }
698done:
699 if (fn)
700 fn(data, err);
701 return 0;
702}
703
704static int rdac_prep_fn(struct scsi_device *sdev, struct request *req)
705{
706 struct rdac_dh_data *h = get_rdac_data(sdev);
707 int ret = BLKPREP_OK;
708
709 if (h->state != RDAC_STATE_ACTIVE) {
710 ret = BLKPREP_KILL;
711 req->cmd_flags |= REQ_QUIET;
712 }
713 return ret;
714
715}
716
717static int rdac_check_sense(struct scsi_device *sdev,
718 struct scsi_sense_hdr *sense_hdr)
719{
720 struct rdac_dh_data *h = get_rdac_data(sdev);
721
722 RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, "
723 "I/O returned with sense %02x/%02x/%02x",
724 (char *) h->ctlr->array_name, h->ctlr->index,
725 sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
726
727 switch (sense_hdr->sense_key) {
728 case NOT_READY:
729 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
730
731
732
733
734 return ADD_TO_MLQUEUE;
735 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81)
736
737
738
739
740
741 return SUCCESS;
742 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1)
743
744
745
746
747 return ADD_TO_MLQUEUE;
748 if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02)
749
750
751
752
753 return ADD_TO_MLQUEUE;
754 break;
755 case ILLEGAL_REQUEST:
756 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) {
757
758
759
760
761 h->state = RDAC_STATE_PASSIVE;
762 return SUCCESS;
763 }
764 break;
765 case UNIT_ATTENTION:
766 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
767
768
769
770 return ADD_TO_MLQUEUE;
771 if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02)
772
773
774
775 return ADD_TO_MLQUEUE;
776 break;
777 }
778
779 return SCSI_RETURN_NOT_HANDLED;
780}
781
782static const struct scsi_dh_devlist rdac_dev_list[] = {
783 {"IBM", "1722"},
784 {"IBM", "1724"},
785 {"IBM", "1726"},
786 {"IBM", "1742"},
787 {"IBM", "1745"},
788 {"IBM", "1746"},
789 {"IBM", "1814"},
790 {"IBM", "1815"},
791 {"IBM", "1818"},
792 {"IBM", "3526"},
793 {"SGI", "TP9"},
794 {"SGI", "IS"},
795 {"STK", "OPENstorage D280"},
796 {"STK", "FLEXLINE 380"},
797 {"SUN", "CSM"},
798 {"SUN", "LCSM100"},
799 {"SUN", "STK6580_6780"},
800 {"SUN", "SUN_6180"},
801 {"SUN", "ArrayStorage"},
802 {"DELL", "MD3"},
803 {"NETAPP", "INF-01-00"},
804 {"LSI", "INF-01-00"},
805 {"ENGENIO", "INF-01-00"},
806 {NULL, NULL},
807};
808
809static bool rdac_match(struct scsi_device *sdev)
810{
811 int i;
812
813 if (scsi_device_tpgs(sdev))
814 return false;
815
816 for (i = 0; rdac_dev_list[i].vendor; i++) {
817 if (!strncmp(sdev->vendor, rdac_dev_list[i].vendor,
818 strlen(rdac_dev_list[i].vendor)) &&
819 !strncmp(sdev->model, rdac_dev_list[i].model,
820 strlen(rdac_dev_list[i].model))) {
821 return true;
822 }
823 }
824 return false;
825}
826
827static int rdac_bus_attach(struct scsi_device *sdev);
828static void rdac_bus_detach(struct scsi_device *sdev);
829
830static struct scsi_device_handler rdac_dh = {
831 .name = RDAC_NAME,
832 .module = THIS_MODULE,
833 .devlist = rdac_dev_list,
834 .prep_fn = rdac_prep_fn,
835 .check_sense = rdac_check_sense,
836 .attach = rdac_bus_attach,
837 .detach = rdac_bus_detach,
838 .activate = rdac_activate,
839 .match = rdac_match,
840};
841
842static int rdac_bus_attach(struct scsi_device *sdev)
843{
844 struct scsi_dh_data *scsi_dh_data;
845 struct rdac_dh_data *h;
846 unsigned long flags;
847 int err;
848 char array_name[ARRAY_LABEL_LEN];
849 char array_id[UNIQUE_ID_LEN];
850
851 scsi_dh_data = kzalloc(sizeof(*scsi_dh_data)
852 + sizeof(*h) , GFP_KERNEL);
853 if (!scsi_dh_data) {
854 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
855 RDAC_NAME);
856 return -ENOMEM;
857 }
858
859 scsi_dh_data->scsi_dh = &rdac_dh;
860 h = (struct rdac_dh_data *) scsi_dh_data->buf;
861 h->lun = UNINITIALIZED_LUN;
862 h->state = RDAC_STATE_ACTIVE;
863
864 err = get_lun_info(sdev, h, array_name, array_id);
865 if (err != SCSI_DH_OK)
866 goto failed;
867
868 err = initialize_controller(sdev, h, array_name, array_id);
869 if (err != SCSI_DH_OK)
870 goto failed;
871
872 err = check_ownership(sdev, h);
873 if (err != SCSI_DH_OK)
874 goto clean_ctlr;
875
876 err = set_mode_select(sdev, h);
877 if (err != SCSI_DH_OK)
878 goto clean_ctlr;
879
880 if (!try_module_get(THIS_MODULE))
881 goto clean_ctlr;
882
883 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
884 sdev->scsi_dh_data = scsi_dh_data;
885 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
886
887 sdev_printk(KERN_NOTICE, sdev,
888 "%s: LUN %d (%s) (%s)\n",
889 RDAC_NAME, h->lun, mode[(int)h->mode],
890 lun_state[(int)h->lun_state]);
891
892 return 0;
893
894clean_ctlr:
895 spin_lock(&list_lock);
896 kref_put(&h->ctlr->kref, release_controller);
897 spin_unlock(&list_lock);
898
899failed:
900 kfree(scsi_dh_data);
901 sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
902 RDAC_NAME);
903 return -EINVAL;
904}
905
906static void rdac_bus_detach( struct scsi_device *sdev )
907{
908 struct scsi_dh_data *scsi_dh_data;
909 struct rdac_dh_data *h;
910 unsigned long flags;
911
912 scsi_dh_data = sdev->scsi_dh_data;
913 h = (struct rdac_dh_data *) scsi_dh_data->buf;
914 if (h->ctlr && h->ctlr->ms_queued)
915 flush_workqueue(kmpath_rdacd);
916
917 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
918 sdev->scsi_dh_data = NULL;
919 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
920
921 spin_lock(&list_lock);
922 if (h->ctlr)
923 kref_put(&h->ctlr->kref, release_controller);
924 spin_unlock(&list_lock);
925 kfree(scsi_dh_data);
926 module_put(THIS_MODULE);
927 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME);
928}
929
930
931
932static int __init rdac_init(void)
933{
934 int r;
935
936 r = scsi_register_device_handler(&rdac_dh);
937 if (r != 0) {
938 printk(KERN_ERR "Failed to register scsi device handler.");
939 goto done;
940 }
941
942
943
944
945 kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd");
946 if (!kmpath_rdacd) {
947 scsi_unregister_device_handler(&rdac_dh);
948 printk(KERN_ERR "kmpath_rdacd creation failed.\n");
949
950 r = -EINVAL;
951 }
952done:
953 return r;
954}
955
956static void __exit rdac_exit(void)
957{
958 destroy_workqueue(kmpath_rdacd);
959 scsi_unregister_device_handler(&rdac_dh);
960}
961
962module_init(rdac_init);
963module_exit(rdac_exit);
964
965MODULE_DESCRIPTION("Multipath LSI/Engenio/NetApp E-Series RDAC driver");
966MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
967MODULE_VERSION("01.00.0000.0000");
968MODULE_LICENSE("GPL");
969
