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staging: brcm80211: assure common sources are truly common
[zen-stable.git] / drivers / scsi / device_handler / scsi_dh_rdac.c
blob5be3ae15cb71b858a7402b06a6c10923facd1edf
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 struct rdac_controller {
132 u8 subsys_id[SUBSYS_ID_LEN];
133 u8 slot_id[SLOT_ID_LEN];
134 int use_ms10;
135 struct kref kref;
136 struct list_head node; /* list of all controllers */
137 union {
138 struct rdac_pg_legacy legacy;
139 struct rdac_pg_expanded expanded;
140 } mode_select;
141 u8 index;
142 u8 array_name[ARRAY_LABEL_LEN];
143 spinlock_t ms_lock;
144 int ms_queued;
145 struct work_struct ms_work;
146 struct scsi_device *ms_sdev;
147 struct list_head ms_head;
148 };
149
150 struct c8_inquiry {
151 u8 peripheral_info;
152 u8 page_code; /* 0xC8 */
153 u8 reserved1;
154 u8 page_len;
155 u8 page_id[4]; /* "edid" */
156 u8 reserved2[3];
157 u8 vol_uniq_id_len;
158 u8 vol_uniq_id[16];
159 u8 vol_user_label_len;
160 u8 vol_user_label[60];
161 u8 array_uniq_id_len;
162 u8 array_unique_id[16];
163 u8 array_user_label_len;
164 u8 array_user_label[60];
165 u8 lun[8];
166 };
167
168 struct c2_inquiry {
169 u8 peripheral_info;
170 u8 page_code; /* 0xC2 */
171 u8 reserved1;
172 u8 page_len;
173 u8 page_id[4]; /* "swr4" */
174 u8 sw_version[3];
175 u8 sw_date[3];
176 u8 features_enabled;
177 u8 max_lun_supported;
178 u8 partitions[239]; /* Total allocation length should be 0xFF */
179 };
180
181 struct rdac_dh_data {
182 struct rdac_controller *ctlr;
183 #define UNINITIALIZED_LUN (1 << 8)
184 unsigned lun;
185 #define RDAC_STATE_ACTIVE 0
186 #define RDAC_STATE_PASSIVE 1
187 unsigned char state;
188
189 #define RDAC_LUN_UNOWNED 0
190 #define RDAC_LUN_OWNED 1
191 #define RDAC_LUN_AVT 2
192 char lun_state;
193 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
194 union {
195 struct c2_inquiry c2;
196 struct c4_inquiry c4;
197 struct c8_inquiry c8;
198 struct c9_inquiry c9;
199 } inq;
200 };
201
202 static const char *lun_state[] =
203 {
204 "unowned",
205 "owned",
206 "owned (AVT mode)",
207 };
208
209 struct rdac_queue_data {
210 struct list_head entry;
211 struct rdac_dh_data *h;
212 activate_complete callback_fn;
213 void *callback_data;
214 };
215
216 static LIST_HEAD(ctlr_list);
217 static DEFINE_SPINLOCK(list_lock);
218 static struct workqueue_struct *kmpath_rdacd;
219 static void send_mode_select(struct work_struct *work);
220
221 /*
222 * module parameter to enable rdac debug logging.
223 * 2 bits for each type of logging, only two types defined for now
224 * Can be enhanced if required at later point
225 */
226 static int rdac_logging = 1;
227 module_param(rdac_logging, int, S_IRUGO|S_IWUSR);
228 MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, "
229 "Default is 1 - failover logging enabled, "
230 "set it to 0xF to enable all the logs");
231
232 #define RDAC_LOG_FAILOVER 0
233 #define RDAC_LOG_SENSE 2
234
235 #define RDAC_LOG_BITS 2
236
237 #define RDAC_LOG_LEVEL(SHIFT) \
238 ((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1))
239
240 #define RDAC_LOG(SHIFT, sdev, f, arg...) \
241 do { \
242 if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \
243 sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \
244 } while (0);
245
246 static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev)
247 {
248 struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
249 BUG_ON(scsi_dh_data == NULL);
250 return ((struct rdac_dh_data *) scsi_dh_data->buf);
251 }
252
253 static struct request *get_rdac_req(struct scsi_device *sdev,
254 void *buffer, unsigned buflen, int rw)
255 {
256 struct request *rq;
257 struct request_queue *q = sdev->request_queue;
258
259 rq = blk_get_request(q, rw, GFP_NOIO);
260
261 if (!rq) {
262 sdev_printk(KERN_INFO, sdev,
263 "get_rdac_req: blk_get_request failed.\n");
264 return NULL;
265 }
266
267 if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) {
268 blk_put_request(rq);
269 sdev_printk(KERN_INFO, sdev,
270 "get_rdac_req: blk_rq_map_kern failed.\n");
271 return NULL;
272 }
273
274 rq->cmd_type = REQ_TYPE_BLOCK_PC;
275 rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
276 REQ_FAILFAST_DRIVER;
277 rq->retries = RDAC_RETRIES;
278 rq->timeout = RDAC_TIMEOUT;
279
280 return rq;
281 }
282
283 static struct request *rdac_failover_get(struct scsi_device *sdev,
284 struct rdac_dh_data *h)
285 {
286 struct request *rq;
287 struct rdac_mode_common *common;
288 unsigned data_size;
289
290 if (h->ctlr->use_ms10) {
291 struct rdac_pg_expanded *rdac_pg;
292
293 data_size = sizeof(struct rdac_pg_expanded);
294 rdac_pg = &h->ctlr->mode_select.expanded;
295 memset(rdac_pg, 0, data_size);
296 common = &rdac_pg->common;
297 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40;
298 rdac_pg->subpage_code = 0x1;
299 rdac_pg->page_len[0] = 0x01;
300 rdac_pg->page_len[1] = 0x28;
301 } else {
302 struct rdac_pg_legacy *rdac_pg;
303
304 data_size = sizeof(struct rdac_pg_legacy);
305 rdac_pg = &h->ctlr->mode_select.legacy;
306 memset(rdac_pg, 0, data_size);
307 common = &rdac_pg->common;
308 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER;
309 rdac_pg->page_len = 0x68;
310 }
311 common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS;
312 common->quiescence_timeout = RDAC_QUIESCENCE_TIME;
313 common->rdac_options = RDAC_FORCED_QUIESENCE;
314
315 /* get request for block layer packet command */
316 rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE);
317 if (!rq)
318 return NULL;
319
320 /* Prepare the command. */
321 if (h->ctlr->use_ms10) {
322 rq->cmd[0] = MODE_SELECT_10;
323 rq->cmd[7] = data_size >> 8;
324 rq->cmd[8] = data_size & 0xff;
325 } else {
326 rq->cmd[0] = MODE_SELECT;
327 rq->cmd[4] = data_size;
328 }
329 rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
330
331 rq->sense = h->sense;
332 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
333 rq->sense_len = 0;
334
335 return rq;
336 }
337
338 static void release_controller(struct kref *kref)
339 {
340 struct rdac_controller *ctlr;
341 ctlr = container_of(kref, struct rdac_controller, kref);
342
343 flush_workqueue(kmpath_rdacd);
344 spin_lock(&list_lock);
345 list_del(&ctlr->node);
346 spin_unlock(&list_lock);
347 kfree(ctlr);
348 }
349
350 static struct rdac_controller *get_controller(u8 *subsys_id, u8 *slot_id,
351 char *array_name)
352 {
353 struct rdac_controller *ctlr, *tmp;
354
355 spin_lock(&list_lock);
356
357 list_for_each_entry(tmp, &ctlr_list, node) {
358 if ((memcmp(tmp->subsys_id, subsys_id, SUBSYS_ID_LEN) == 0) &&
359 (memcmp(tmp->slot_id, slot_id, SLOT_ID_LEN) == 0)) {
360 kref_get(&tmp->kref);
361 spin_unlock(&list_lock);
362 return tmp;
363 }
364 }
365 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
366 if (!ctlr)
367 goto done;
368
369 /* initialize fields of controller */
370 memcpy(ctlr->subsys_id, subsys_id, SUBSYS_ID_LEN);
371 memcpy(ctlr->slot_id, slot_id, SLOT_ID_LEN);
372 memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN);
373
374 /* update the controller index */
375 if (slot_id[1] == 0x31)
376 ctlr->index = 0;
377 else
378 ctlr->index = 1;
379
380 kref_init(&ctlr->kref);
381 ctlr->use_ms10 = -1;
382 ctlr->ms_queued = 0;
383 ctlr->ms_sdev = NULL;
384 spin_lock_init(&ctlr->ms_lock);
385 INIT_WORK(&ctlr->ms_work, send_mode_select);
386 INIT_LIST_HEAD(&ctlr->ms_head);
387 list_add(&ctlr->node, &ctlr_list);
388 done:
389 spin_unlock(&list_lock);
390 return ctlr;
391 }
392
393 static int submit_inquiry(struct scsi_device *sdev, int page_code,
394 unsigned int len, struct rdac_dh_data *h)
395 {
396 struct request *rq;
397 struct request_queue *q = sdev->request_queue;
398 int err = SCSI_DH_RES_TEMP_UNAVAIL;
399
400 rq = get_rdac_req(sdev, &h->inq, len, READ);
401 if (!rq)
402 goto done;
403
404 /* Prepare the command. */
405 rq->cmd[0] = INQUIRY;
406 rq->cmd[1] = 1;
407 rq->cmd[2] = page_code;
408 rq->cmd[4] = len;
409 rq->cmd_len = COMMAND_SIZE(INQUIRY);
410
411 rq->sense = h->sense;
412 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
413 rq->sense_len = 0;
414
415 err = blk_execute_rq(q, NULL, rq, 1);
416 if (err == -EIO)
417 err = SCSI_DH_IO;
418
419 blk_put_request(rq);
420 done:
421 return err;
422 }
423
424 static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h,
425 char *array_name)
426 {
427 int err, i;
428 struct c8_inquiry *inqp;
429
430 err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h);
431 if (err == SCSI_DH_OK) {
432 inqp = &h->inq.c8;
433 if (inqp->page_code != 0xc8)
434 return SCSI_DH_NOSYS;
435 if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' ||
436 inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd')
437 return SCSI_DH_NOSYS;
438 h->lun = inqp->lun[7]; /* Uses only the last byte */
439
440 for(i=0; i<ARRAY_LABEL_LEN-1; ++i)
441 *(array_name+i) = inqp->array_user_label[(2*i)+1];
442
443 *(array_name+ARRAY_LABEL_LEN-1) = '\0';
444 }
445 return err;
446 }
447
448 static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h)
449 {
450 int err;
451 struct c9_inquiry *inqp;
452
453 h->lun_state = RDAC_LUN_UNOWNED;
454 h->state = RDAC_STATE_ACTIVE;
455 err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h);
456 if (err == SCSI_DH_OK) {
457 inqp = &h->inq.c9;
458 if ((inqp->avte_cvp >> 7) == 0x1) {
459 /* LUN in AVT mode */
460 sdev_printk(KERN_NOTICE, sdev,
461 "%s: AVT mode detected\n",
462 RDAC_NAME);
463 h->lun_state = RDAC_LUN_AVT;
464 } else if ((inqp->avte_cvp & 0x1) != 0) {
465 /* LUN was owned by the controller */
466 h->lun_state = RDAC_LUN_OWNED;
467 }
468 }
469
470 if (h->lun_state == RDAC_LUN_UNOWNED)
471 h->state = RDAC_STATE_PASSIVE;
472
473 return err;
474 }
475
476 static int initialize_controller(struct scsi_device *sdev,
477 struct rdac_dh_data *h, char *array_name)
478 {
479 int err;
480 struct c4_inquiry *inqp;
481
482 err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h);
483 if (err == SCSI_DH_OK) {
484 inqp = &h->inq.c4;
485 h->ctlr = get_controller(inqp->subsys_id, inqp->slot_id,
486 array_name);
487 if (!h->ctlr)
488 err = SCSI_DH_RES_TEMP_UNAVAIL;
489 }
490 return err;
491 }
492
493 static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
494 {
495 int err;
496 struct c2_inquiry *inqp;
497
498 err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h);
499 if (err == SCSI_DH_OK) {
500 inqp = &h->inq.c2;
501 /*
502 * If more than MODE6_MAX_LUN luns are supported, use
503 * mode select 10
504 */
505 if (inqp->max_lun_supported >= MODE6_MAX_LUN)
506 h->ctlr->use_ms10 = 1;
507 else
508 h->ctlr->use_ms10 = 0;
509 }
510 return err;
511 }
512
513 static int mode_select_handle_sense(struct scsi_device *sdev,
514 unsigned char *sensebuf)
515 {
516 struct scsi_sense_hdr sense_hdr;
517 int err = SCSI_DH_IO, ret;
518 struct rdac_dh_data *h = get_rdac_data(sdev);
519
520 ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr);
521 if (!ret)
522 goto done;
523
524 switch (sense_hdr.sense_key) {
525 case NO_SENSE:
526 case ABORTED_COMMAND:
527 case UNIT_ATTENTION:
528 err = SCSI_DH_RETRY;
529 break;
530 case NOT_READY:
531 if (sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x01)
532 /* LUN Not Ready and is in the Process of Becoming
533 * Ready
534 */
535 err = SCSI_DH_RETRY;
536 break;
537 case ILLEGAL_REQUEST:
538 if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36)
539 /*
540 * Command Lock contention
541 */
542 err = SCSI_DH_RETRY;
543 break;
544 default:
545 break;
546 }
547
548 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
549 "MODE_SELECT returned with sense %02x/%02x/%02x",
550 (char *) h->ctlr->array_name, h->ctlr->index,
551 sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq);
552
553 done:
554 return err;
555 }
556
557 static void send_mode_select(struct work_struct *work)
558 {
559 struct rdac_controller *ctlr =
560 container_of(work, struct rdac_controller, ms_work);
561 struct request *rq;
562 struct scsi_device *sdev = ctlr->ms_sdev;
563 struct rdac_dh_data *h = get_rdac_data(sdev);
564 struct request_queue *q = sdev->request_queue;
565 int err, retry_cnt = RDAC_RETRY_COUNT;
566 struct rdac_queue_data *tmp, *qdata;
567 LIST_HEAD(list);
568 u8 *lun_table;
569
570 spin_lock(&ctlr->ms_lock);
571 list_splice_init(&ctlr->ms_head, &list);
572 ctlr->ms_queued = 0;
573 ctlr->ms_sdev = NULL;
574 spin_unlock(&ctlr->ms_lock);
575
576 if (ctlr->use_ms10)
577 lun_table = ctlr->mode_select.expanded.lun_table;
578 else
579 lun_table = ctlr->mode_select.legacy.lun_table;
580
581 retry:
582 err = SCSI_DH_RES_TEMP_UNAVAIL;
583 rq = rdac_failover_get(sdev, h);
584 if (!rq)
585 goto done;
586
587 list_for_each_entry(qdata, &list, entry) {
588 lun_table[qdata->h->lun] = 0x81;
589 }
590
591 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
592 "%s MODE_SELECT command",
593 (char *) h->ctlr->array_name, h->ctlr->index,
594 (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying");
595
596 err = blk_execute_rq(q, NULL, rq, 1);
597 blk_put_request(rq);
598 if (err != SCSI_DH_OK) {
599 err = mode_select_handle_sense(sdev, h->sense);
600 if (err == SCSI_DH_RETRY && retry_cnt--)
601 goto retry;
602 }
603 if (err == SCSI_DH_OK) {
604 h->state = RDAC_STATE_ACTIVE;
605 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
606 "MODE_SELECT completed",
607 (char *) h->ctlr->array_name, h->ctlr->index);
608 }
609
610 done:
611 list_for_each_entry_safe(qdata, tmp, &list, entry) {
612 list_del(&qdata->entry);
613 if (err == SCSI_DH_OK)
614 qdata->h->state = RDAC_STATE_ACTIVE;
615 if (qdata->callback_fn)
616 qdata->callback_fn(qdata->callback_data, err);
617 kfree(qdata);
618 }
619 return;
620 }
621
622 static int queue_mode_select(struct scsi_device *sdev,
623 activate_complete fn, void *data)
624 {
625 struct rdac_queue_data *qdata;
626 struct rdac_controller *ctlr;
627
628 qdata = kzalloc(sizeof(*qdata), GFP_KERNEL);
629 if (!qdata)
630 return SCSI_DH_RETRY;
631
632 qdata->h = get_rdac_data(sdev);
633 qdata->callback_fn = fn;
634 qdata->callback_data = data;
635
636 ctlr = qdata->h->ctlr;
637 spin_lock(&ctlr->ms_lock);
638 list_add_tail(&qdata->entry, &ctlr->ms_head);
639 if (!ctlr->ms_queued) {
640 ctlr->ms_queued = 1;
641 ctlr->ms_sdev = sdev;
642 queue_work(kmpath_rdacd, &ctlr->ms_work);
643 }
644 spin_unlock(&ctlr->ms_lock);
645 return SCSI_DH_OK;
646 }
647
648 static int rdac_activate(struct scsi_device *sdev,
649 activate_complete fn, void *data)
650 {
651 struct rdac_dh_data *h = get_rdac_data(sdev);
652 int err = SCSI_DH_OK;
653
654 err = check_ownership(sdev, h);
655 if (err != SCSI_DH_OK)
656 goto done;
657
658 if (h->lun_state == RDAC_LUN_UNOWNED) {
659 err = queue_mode_select(sdev, fn, data);
660 if (err == SCSI_DH_OK)
661 return 0;
662 }
663 done:
664 if (fn)
665 fn(data, err);
666 return 0;
667 }
668
669 static int rdac_prep_fn(struct scsi_device *sdev, struct request *req)
670 {
671 struct rdac_dh_data *h = get_rdac_data(sdev);
672 int ret = BLKPREP_OK;
673
674 if (h->state != RDAC_STATE_ACTIVE) {
675 ret = BLKPREP_KILL;
676 req->cmd_flags |= REQ_QUIET;
677 }
678 return ret;
679
680 }
681
682 static int rdac_check_sense(struct scsi_device *sdev,
683 struct scsi_sense_hdr *sense_hdr)
684 {
685 struct rdac_dh_data *h = get_rdac_data(sdev);
686
687 RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, "
688 "I/O returned with sense %02x/%02x/%02x",
689 (char *) h->ctlr->array_name, h->ctlr->index,
690 sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
691
692 switch (sense_hdr->sense_key) {
693 case NOT_READY:
694 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
695 /* LUN Not Ready - Logical Unit Not Ready and is in
696 * the process of becoming ready
697 * Just retry.
698 */
699 return ADD_TO_MLQUEUE;
700 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81)
701 /* LUN Not Ready - Storage firmware incompatible
702 * Manual code synchonisation required.
703 *
704 * Nothing we can do here. Try to bypass the path.
705 */
706 return SUCCESS;
707 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1)
708 /* LUN Not Ready - Quiescense in progress
709 *
710 * Just retry and wait.
711 */
712 return ADD_TO_MLQUEUE;
713 if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02)
714 /* LUN Not Ready - Quiescense in progress
715 * or has been achieved
716 * Just retry.
717 */
718 return ADD_TO_MLQUEUE;
719 break;
720 case ILLEGAL_REQUEST:
721 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) {
722 /* Invalid Request - Current Logical Unit Ownership.
723 * Controller is not the current owner of the LUN,
724 * Fail the path, so that the other path be used.
725 */
726 h->state = RDAC_STATE_PASSIVE;
727 return SUCCESS;
728 }
729 break;
730 case UNIT_ATTENTION:
731 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
732 /*
733 * Power On, Reset, or Bus Device Reset, just retry.
734 */
735 return ADD_TO_MLQUEUE;
736 if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02)
737 /*
738 * Quiescence in progress , just retry.
739 */
740 return ADD_TO_MLQUEUE;
741 break;
742 }
743 /* success just means we do not care what scsi-ml does */
744 return SCSI_RETURN_NOT_HANDLED;
745 }
746
747 static const struct scsi_dh_devlist rdac_dev_list[] = {
748 {"IBM", "1722"},
749 {"IBM", "1724"},
750 {"IBM", "1726"},
751 {"IBM", "1742"},
752 {"IBM", "1745"},
753 {"IBM", "1746"},
754 {"IBM", "1814"},
755 {"IBM", "1815"},
756 {"IBM", "1818"},
757 {"IBM", "3526"},
758 {"SGI", "TP9400"},
759 {"SGI", "TP9500"},
760 {"SGI", "IS"},
761 {"STK", "OPENstorage D280"},
762 {"SUN", "CSM200_R"},
763 {"SUN", "LCSM100_I"},
764 {"SUN", "LCSM100_S"},
765 {"SUN", "LCSM100_E"},
766 {"SUN", "LCSM100_F"},
767 {"DELL", "MD3000"},
768 {"DELL", "MD3000i"},
769 {"DELL", "MD32xx"},
770 {"DELL", "MD32xxi"},
771 {"DELL", "MD36xxi"},
772 {"LSI", "INF-01-00"},
773 {"ENGENIO", "INF-01-00"},
774 {"STK", "FLEXLINE 380"},
775 {"SUN", "CSM100_R_FC"},
776 {"SUN", "STK6580_6780"},
777 {"SUN", "SUN_6180"},
778 {NULL, NULL},
779 };
780
781 static int rdac_bus_attach(struct scsi_device *sdev);
782 static void rdac_bus_detach(struct scsi_device *sdev);
783
784 static struct scsi_device_handler rdac_dh = {
785 .name = RDAC_NAME,
786 .module = THIS_MODULE,
787 .devlist = rdac_dev_list,
788 .prep_fn = rdac_prep_fn,
789 .check_sense = rdac_check_sense,
790 .attach = rdac_bus_attach,
791 .detach = rdac_bus_detach,
792 .activate = rdac_activate,
793 };
794
795 static int rdac_bus_attach(struct scsi_device *sdev)
796 {
797 struct scsi_dh_data *scsi_dh_data;
798 struct rdac_dh_data *h;
799 unsigned long flags;
800 int err;
801 char array_name[ARRAY_LABEL_LEN];
802
803 scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
804 + sizeof(*h) , GFP_KERNEL);
805 if (!scsi_dh_data) {
806 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
807 RDAC_NAME);
808 return 0;
809 }
810
811 scsi_dh_data->scsi_dh = &rdac_dh;
812 h = (struct rdac_dh_data *) scsi_dh_data->buf;
813 h->lun = UNINITIALIZED_LUN;
814 h->state = RDAC_STATE_ACTIVE;
815
816 err = get_lun_info(sdev, h, array_name);
817 if (err != SCSI_DH_OK)
818 goto failed;
819
820 err = initialize_controller(sdev, h, array_name);
821 if (err != SCSI_DH_OK)
822 goto failed;
823
824 err = check_ownership(sdev, h);
825 if (err != SCSI_DH_OK)
826 goto clean_ctlr;
827
828 err = set_mode_select(sdev, h);
829 if (err != SCSI_DH_OK)
830 goto clean_ctlr;
831
832 if (!try_module_get(THIS_MODULE))
833 goto clean_ctlr;
834
835 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
836 sdev->scsi_dh_data = scsi_dh_data;
837 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
838
839 sdev_printk(KERN_NOTICE, sdev,
840 "%s: LUN %d (%s)\n",
841 RDAC_NAME, h->lun, lun_state[(int)h->lun_state]);
842
843 return 0;
844
845 clean_ctlr:
846 kref_put(&h->ctlr->kref, release_controller);
847
848 failed:
849 kfree(scsi_dh_data);
850 sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
851 RDAC_NAME);
852 return -EINVAL;
853 }
854
855 static void rdac_bus_detach( struct scsi_device *sdev )
856 {
857 struct scsi_dh_data *scsi_dh_data;
858 struct rdac_dh_data *h;
859 unsigned long flags;
860
861 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
862 scsi_dh_data = sdev->scsi_dh_data;
863 sdev->scsi_dh_data = NULL;
864 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
865
866 h = (struct rdac_dh_data *) scsi_dh_data->buf;
867 if (h->ctlr)
868 kref_put(&h->ctlr->kref, release_controller);
869 kfree(scsi_dh_data);
870 module_put(THIS_MODULE);
871 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME);
872 }
873
874
875
876 static int __init rdac_init(void)
877 {
878 int r;
879
880 r = scsi_register_device_handler(&rdac_dh);
881 if (r != 0) {
882 printk(KERN_ERR "Failed to register scsi device handler.");
883 goto done;
884 }
885
886 /*
887 * Create workqueue to handle mode selects for rdac
888 */
889 kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd");
890 if (!kmpath_rdacd) {
891 scsi_unregister_device_handler(&rdac_dh);
892 printk(KERN_ERR "kmpath_rdacd creation failed.\n");
893 }
894 done:
895 return r;
896 }
897
898 static void __exit rdac_exit(void)
899 {
900 destroy_workqueue(kmpath_rdacd);
901 scsi_unregister_device_handler(&rdac_dh);
902 }
903
904 module_init(rdac_init);
905 module_exit(rdac_exit);
906
907 MODULE_DESCRIPTION("Multipath LSI/Engenio RDAC driver");
908 MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
909 MODULE_LICENSE("GPL");