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Revert "gma500: Fix dependencies"
[zen-stable.git] / drivers / scsi / device_handler / scsi_dh_rdac.c
blobe7fc70d6b478734fb2b71f34f91400d331ee8070
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
186 #define RDAC_MODE 0
187 #define RDAC_MODE_AVT 1
188 #define RDAC_MODE_IOSHIP 2
189 unsigned char mode;
190
191 #define RDAC_STATE_ACTIVE 0
192 #define RDAC_STATE_PASSIVE 1
193 unsigned char state;
194
195 #define RDAC_LUN_UNOWNED 0
196 #define RDAC_LUN_OWNED 1
197 char lun_state;
198
199 #define RDAC_PREFERRED 0
200 #define RDAC_NON_PREFERRED 1
201 char preferred;
202
203 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
204 union {
205 struct c2_inquiry c2;
206 struct c4_inquiry c4;
207 struct c8_inquiry c8;
208 struct c9_inquiry c9;
209 } inq;
210 };
211
212 static const char *mode[] = {
213 "RDAC",
214 "AVT",
215 "IOSHIP",
216 };
217 static const char *lun_state[] =
218 {
219 "unowned",
220 "owned",
221 };
222
223 struct rdac_queue_data {
224 struct list_head entry;
225 struct rdac_dh_data *h;
226 activate_complete callback_fn;
227 void *callback_data;
228 };
229
230 static LIST_HEAD(ctlr_list);
231 static DEFINE_SPINLOCK(list_lock);
232 static struct workqueue_struct *kmpath_rdacd;
233 static void send_mode_select(struct work_struct *work);
234
235 /*
236 * module parameter to enable rdac debug logging.
237 * 2 bits for each type of logging, only two types defined for now
238 * Can be enhanced if required at later point
239 */
240 static int rdac_logging = 1;
241 module_param(rdac_logging, int, S_IRUGO|S_IWUSR);
242 MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, "
243 "Default is 1 - failover logging enabled, "
244 "set it to 0xF to enable all the logs");
245
246 #define RDAC_LOG_FAILOVER 0
247 #define RDAC_LOG_SENSE 2
248
249 #define RDAC_LOG_BITS 2
250
251 #define RDAC_LOG_LEVEL(SHIFT) \
252 ((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1))
253
254 #define RDAC_LOG(SHIFT, sdev, f, arg...) \
255 do { \
256 if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \
257 sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \
258 } while (0);
259
260 static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev)
261 {
262 struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
263 BUG_ON(scsi_dh_data == NULL);
264 return ((struct rdac_dh_data *) scsi_dh_data->buf);
265 }
266
267 static struct request *get_rdac_req(struct scsi_device *sdev,
268 void *buffer, unsigned buflen, int rw)
269 {
270 struct request *rq;
271 struct request_queue *q = sdev->request_queue;
272
273 rq = blk_get_request(q, rw, GFP_NOIO);
274
275 if (!rq) {
276 sdev_printk(KERN_INFO, sdev,
277 "get_rdac_req: blk_get_request failed.\n");
278 return NULL;
279 }
280
281 if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) {
282 blk_put_request(rq);
283 sdev_printk(KERN_INFO, sdev,
284 "get_rdac_req: blk_rq_map_kern failed.\n");
285 return NULL;
286 }
287
288 rq->cmd_type = REQ_TYPE_BLOCK_PC;
289 rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
290 REQ_FAILFAST_DRIVER;
291 rq->retries = RDAC_RETRIES;
292 rq->timeout = RDAC_TIMEOUT;
293
294 return rq;
295 }
296
297 static struct request *rdac_failover_get(struct scsi_device *sdev,
298 struct rdac_dh_data *h, struct list_head *list)
299 {
300 struct request *rq;
301 struct rdac_mode_common *common;
302 unsigned data_size;
303 struct rdac_queue_data *qdata;
304 u8 *lun_table;
305
306 if (h->ctlr->use_ms10) {
307 struct rdac_pg_expanded *rdac_pg;
308
309 data_size = sizeof(struct rdac_pg_expanded);
310 rdac_pg = &h->ctlr->mode_select.expanded;
311 memset(rdac_pg, 0, data_size);
312 common = &rdac_pg->common;
313 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40;
314 rdac_pg->subpage_code = 0x1;
315 rdac_pg->page_len[0] = 0x01;
316 rdac_pg->page_len[1] = 0x28;
317 lun_table = rdac_pg->lun_table;
318 } else {
319 struct rdac_pg_legacy *rdac_pg;
320
321 data_size = sizeof(struct rdac_pg_legacy);
322 rdac_pg = &h->ctlr->mode_select.legacy;
323 memset(rdac_pg, 0, data_size);
324 common = &rdac_pg->common;
325 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER;
326 rdac_pg->page_len = 0x68;
327 lun_table = rdac_pg->lun_table;
328 }
329 common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS;
330 common->quiescence_timeout = RDAC_QUIESCENCE_TIME;
331 common->rdac_options = RDAC_FORCED_QUIESENCE;
332
333 list_for_each_entry(qdata, list, entry) {
334 lun_table[qdata->h->lun] = 0x81;
335 }
336
337 /* get request for block layer packet command */
338 rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE);
339 if (!rq)
340 return NULL;
341
342 /* Prepare the command. */
343 if (h->ctlr->use_ms10) {
344 rq->cmd[0] = MODE_SELECT_10;
345 rq->cmd[7] = data_size >> 8;
346 rq->cmd[8] = data_size & 0xff;
347 } else {
348 rq->cmd[0] = MODE_SELECT;
349 rq->cmd[4] = data_size;
350 }
351 rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
352
353 rq->sense = h->sense;
354 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
355 rq->sense_len = 0;
356
357 return rq;
358 }
359
360 static void release_controller(struct kref *kref)
361 {
362 struct rdac_controller *ctlr;
363 ctlr = container_of(kref, struct rdac_controller, kref);
364
365 flush_workqueue(kmpath_rdacd);
366 spin_lock(&list_lock);
367 list_del(&ctlr->node);
368 spin_unlock(&list_lock);
369 kfree(ctlr);
370 }
371
372 static struct rdac_controller *get_controller(u8 *subsys_id, u8 *slot_id,
373 char *array_name)
374 {
375 struct rdac_controller *ctlr, *tmp;
376
377 spin_lock(&list_lock);
378
379 list_for_each_entry(tmp, &ctlr_list, node) {
380 if ((memcmp(tmp->subsys_id, subsys_id, SUBSYS_ID_LEN) == 0) &&
381 (memcmp(tmp->slot_id, slot_id, SLOT_ID_LEN) == 0)) {
382 kref_get(&tmp->kref);
383 spin_unlock(&list_lock);
384 return tmp;
385 }
386 }
387 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
388 if (!ctlr)
389 goto done;
390
391 /* initialize fields of controller */
392 memcpy(ctlr->subsys_id, subsys_id, SUBSYS_ID_LEN);
393 memcpy(ctlr->slot_id, slot_id, SLOT_ID_LEN);
394 memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN);
395
396 /* update the controller index */
397 if (slot_id[1] == 0x31)
398 ctlr->index = 0;
399 else
400 ctlr->index = 1;
401
402 kref_init(&ctlr->kref);
403 ctlr->use_ms10 = -1;
404 ctlr->ms_queued = 0;
405 ctlr->ms_sdev = NULL;
406 spin_lock_init(&ctlr->ms_lock);
407 INIT_WORK(&ctlr->ms_work, send_mode_select);
408 INIT_LIST_HEAD(&ctlr->ms_head);
409 list_add(&ctlr->node, &ctlr_list);
410 done:
411 spin_unlock(&list_lock);
412 return ctlr;
413 }
414
415 static int submit_inquiry(struct scsi_device *sdev, int page_code,
416 unsigned int len, struct rdac_dh_data *h)
417 {
418 struct request *rq;
419 struct request_queue *q = sdev->request_queue;
420 int err = SCSI_DH_RES_TEMP_UNAVAIL;
421
422 rq = get_rdac_req(sdev, &h->inq, len, READ);
423 if (!rq)
424 goto done;
425
426 /* Prepare the command. */
427 rq->cmd[0] = INQUIRY;
428 rq->cmd[1] = 1;
429 rq->cmd[2] = page_code;
430 rq->cmd[4] = len;
431 rq->cmd_len = COMMAND_SIZE(INQUIRY);
432
433 rq->sense = h->sense;
434 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
435 rq->sense_len = 0;
436
437 err = blk_execute_rq(q, NULL, rq, 1);
438 if (err == -EIO)
439 err = SCSI_DH_IO;
440
441 blk_put_request(rq);
442 done:
443 return err;
444 }
445
446 static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h,
447 char *array_name)
448 {
449 int err, i;
450 struct c8_inquiry *inqp;
451
452 err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h);
453 if (err == SCSI_DH_OK) {
454 inqp = &h->inq.c8;
455 if (inqp->page_code != 0xc8)
456 return SCSI_DH_NOSYS;
457 if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' ||
458 inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd')
459 return SCSI_DH_NOSYS;
460 h->lun = inqp->lun[7]; /* Uses only the last byte */
461
462 for(i=0; i<ARRAY_LABEL_LEN-1; ++i)
463 *(array_name+i) = inqp->array_user_label[(2*i)+1];
464
465 *(array_name+ARRAY_LABEL_LEN-1) = '\0';
466 }
467 return err;
468 }
469
470 static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h)
471 {
472 int err;
473 struct c9_inquiry *inqp;
474
475 h->state = RDAC_STATE_ACTIVE;
476 err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h);
477 if (err == SCSI_DH_OK) {
478 inqp = &h->inq.c9;
479 /* detect the operating mode */
480 if ((inqp->avte_cvp >> 5) & 0x1)
481 h->mode = RDAC_MODE_IOSHIP; /* LUN in IOSHIP mode */
482 else if (inqp->avte_cvp >> 7)
483 h->mode = RDAC_MODE_AVT; /* LUN in AVT mode */
484 else
485 h->mode = RDAC_MODE; /* LUN in RDAC mode */
486
487 /* Update ownership */
488 if (inqp->avte_cvp & 0x1)
489 h->lun_state = RDAC_LUN_OWNED;
490 else {
491 h->lun_state = RDAC_LUN_UNOWNED;
492 if (h->mode == RDAC_MODE)
493 h->state = RDAC_STATE_PASSIVE;
494 }
495
496 /* Update path prio*/
497 if (inqp->path_prio & 0x1)
498 h->preferred = RDAC_PREFERRED;
499 else
500 h->preferred = RDAC_NON_PREFERRED;
501 }
502
503 return err;
504 }
505
506 static int initialize_controller(struct scsi_device *sdev,
507 struct rdac_dh_data *h, char *array_name)
508 {
509 int err;
510 struct c4_inquiry *inqp;
511
512 err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h);
513 if (err == SCSI_DH_OK) {
514 inqp = &h->inq.c4;
515 h->ctlr = get_controller(inqp->subsys_id, inqp->slot_id,
516 array_name);
517 if (!h->ctlr)
518 err = SCSI_DH_RES_TEMP_UNAVAIL;
519 }
520 return err;
521 }
522
523 static 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 * If more than MODE6_MAX_LUN luns are supported, use
533 * mode select 10
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
543 static 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 /* LUN Not Ready and is in the Process of Becoming
563 * Ready
564 */
565 err = SCSI_DH_RETRY;
566 break;
567 case ILLEGAL_REQUEST:
568 if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36)
569 /*
570 * Command Lock contention
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
583 done:
584 return err;
585 }
586
587 static 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
605 retry:
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
630 done:
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
642 static 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
668 static 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 }
698 done:
699 if (fn)
700 fn(data, err);
701 return 0;
702 }
703
704 static 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
717 static 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 /* LUN Not Ready - Logical Unit Not Ready and is in
731 * the process of becoming ready
732 * Just retry.
733 */
734 return ADD_TO_MLQUEUE;
735 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81)
736 /* LUN Not Ready - Storage firmware incompatible
737 * Manual code synchonisation required.
738 *
739 * Nothing we can do here. Try to bypass the path.
740 */
741 return SUCCESS;
742 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1)
743 /* LUN Not Ready - Quiescense in progress
744 *
745 * Just retry and wait.
746 */
747 return ADD_TO_MLQUEUE;
748 if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02)
749 /* LUN Not Ready - Quiescense in progress
750 * or has been achieved
751 * Just retry.
752 */
753 return ADD_TO_MLQUEUE;
754 break;
755 case ILLEGAL_REQUEST:
756 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) {
757 /* Invalid Request - Current Logical Unit Ownership.
758 * Controller is not the current owner of the LUN,
759 * Fail the path, so that the other path be used.
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 * Power On, Reset, or Bus Device Reset, just retry.
769 */
770 return ADD_TO_MLQUEUE;
771 if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02)
772 /*
773 * Quiescence in progress , just retry.
774 */
775 return ADD_TO_MLQUEUE;
776 break;
777 }
778 /* success just means we do not care what scsi-ml does */
779 return SCSI_RETURN_NOT_HANDLED;
780 }
781
782 static 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", "TP9400"},
794 {"SGI", "TP9500"},
795 {"SGI", "IS"},
796 {"STK", "OPENstorage D280"},
797 {"SUN", "CSM200_R"},
798 {"SUN", "LCSM100_I"},
799 {"SUN", "LCSM100_S"},
800 {"SUN", "LCSM100_E"},
801 {"SUN", "LCSM100_F"},
802 {"DELL", "MD3000"},
803 {"DELL", "MD3000i"},
804 {"DELL", "MD32xx"},
805 {"DELL", "MD32xxi"},
806 {"DELL", "MD36xxi"},
807 {"DELL", "MD36xxf"},
808 {"LSI", "INF-01-00"},
809 {"ENGENIO", "INF-01-00"},
810 {"STK", "FLEXLINE 380"},
811 {"SUN", "CSM100_R_FC"},
812 {"SUN", "STK6580_6780"},
813 {"SUN", "SUN_6180"},
814 {NULL, NULL},
815 };
816
817 static int rdac_bus_attach(struct scsi_device *sdev);
818 static void rdac_bus_detach(struct scsi_device *sdev);
819
820 static struct scsi_device_handler rdac_dh = {
821 .name = RDAC_NAME,
822 .module = THIS_MODULE,
823 .devlist = rdac_dev_list,
824 .prep_fn = rdac_prep_fn,
825 .check_sense = rdac_check_sense,
826 .attach = rdac_bus_attach,
827 .detach = rdac_bus_detach,
828 .activate = rdac_activate,
829 };
830
831 static int rdac_bus_attach(struct scsi_device *sdev)
832 {
833 struct scsi_dh_data *scsi_dh_data;
834 struct rdac_dh_data *h;
835 unsigned long flags;
836 int err;
837 char array_name[ARRAY_LABEL_LEN];
838
839 scsi_dh_data = kzalloc(sizeof(*scsi_dh_data)
840 + sizeof(*h) , GFP_KERNEL);
841 if (!scsi_dh_data) {
842 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
843 RDAC_NAME);
844 return 0;
845 }
846
847 scsi_dh_data->scsi_dh = &rdac_dh;
848 h = (struct rdac_dh_data *) scsi_dh_data->buf;
849 h->lun = UNINITIALIZED_LUN;
850 h->state = RDAC_STATE_ACTIVE;
851
852 err = get_lun_info(sdev, h, array_name);
853 if (err != SCSI_DH_OK)
854 goto failed;
855
856 err = initialize_controller(sdev, h, array_name);
857 if (err != SCSI_DH_OK)
858 goto failed;
859
860 err = check_ownership(sdev, h);
861 if (err != SCSI_DH_OK)
862 goto clean_ctlr;
863
864 err = set_mode_select(sdev, h);
865 if (err != SCSI_DH_OK)
866 goto clean_ctlr;
867
868 if (!try_module_get(THIS_MODULE))
869 goto clean_ctlr;
870
871 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
872 sdev->scsi_dh_data = scsi_dh_data;
873 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
874
875 sdev_printk(KERN_NOTICE, sdev,
876 "%s: LUN %d (%s) (%s)\n",
877 RDAC_NAME, h->lun, mode[(int)h->mode],
878 lun_state[(int)h->lun_state]);
879
880 return 0;
881
882 clean_ctlr:
883 kref_put(&h->ctlr->kref, release_controller);
884
885 failed:
886 kfree(scsi_dh_data);
887 sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
888 RDAC_NAME);
889 return -EINVAL;
890 }
891
892 static void rdac_bus_detach( struct scsi_device *sdev )
893 {
894 struct scsi_dh_data *scsi_dh_data;
895 struct rdac_dh_data *h;
896 unsigned long flags;
897
898 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
899 scsi_dh_data = sdev->scsi_dh_data;
900 sdev->scsi_dh_data = NULL;
901 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
902
903 h = (struct rdac_dh_data *) scsi_dh_data->buf;
904 if (h->ctlr)
905 kref_put(&h->ctlr->kref, release_controller);
906 kfree(scsi_dh_data);
907 module_put(THIS_MODULE);
908 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME);
909 }
910
911
912
913 static int __init rdac_init(void)
914 {
915 int r;
916
917 r = scsi_register_device_handler(&rdac_dh);
918 if (r != 0) {
919 printk(KERN_ERR "Failed to register scsi device handler.");
920 goto done;
921 }
922
923 /*
924 * Create workqueue to handle mode selects for rdac
925 */
926 kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd");
927 if (!kmpath_rdacd) {
928 scsi_unregister_device_handler(&rdac_dh);
929 printk(KERN_ERR "kmpath_rdacd creation failed.\n");
930 }
931 done:
932 return r;
933 }
934
935 static void __exit rdac_exit(void)
936 {
937 destroy_workqueue(kmpath_rdacd);
938 scsi_unregister_device_handler(&rdac_dh);
939 }
940
941 module_init(rdac_init);
942 module_exit(rdac_exit);
943
944 MODULE_DESCRIPTION("Multipath LSI/Engenio RDAC driver");
945 MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
946 MODULE_VERSION("01.00.0000.0000");
947 MODULE_LICENSE("GPL");