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include: replace linux/module.h with "struct module" wherever possible
[linux-2.6/next.git] / drivers / scsi / device_handler / scsi_dh_rdac.c
blobac3934a48209375c951a7450ea4752e8d766dce4
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 #include <linux/module.h>
28
29 #define RDAC_NAME "rdac"
30 #define RDAC_RETRY_COUNT 5
31
32 /*
33 * LSI mode page stuff
34 *
35 * These struct definitions and the forming of the
36 * mode page were taken from the LSI RDAC 2.4 GPL'd
37 * driver, and then converted to Linux conventions.
38 */
39 #define RDAC_QUIESCENCE_TIME 20
40 /*
41 * Page Codes
42 */
43 #define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c
44
45 /*
46 * Controller modes definitions
47 */
48 #define RDAC_MODE_TRANSFER_SPECIFIED_LUNS 0x02
49
50 /*
51 * RDAC Options field
52 */
53 #define RDAC_FORCED_QUIESENCE 0x02
54
55 #define RDAC_TIMEOUT (60 * HZ)
56 #define RDAC_RETRIES 3
57
58 struct rdac_mode_6_hdr {
59 u8 data_len;
60 u8 medium_type;
61 u8 device_params;
62 u8 block_desc_len;
63 };
64
65 struct rdac_mode_10_hdr {
66 u16 data_len;
67 u8 medium_type;
68 u8 device_params;
69 u16 reserved;
70 u16 block_desc_len;
71 };
72
73 struct rdac_mode_common {
74 u8 controller_serial[16];
75 u8 alt_controller_serial[16];
76 u8 rdac_mode[2];
77 u8 alt_rdac_mode[2];
78 u8 quiescence_timeout;
79 u8 rdac_options;
80 };
81
82 struct rdac_pg_legacy {
83 struct rdac_mode_6_hdr hdr;
84 u8 page_code;
85 u8 page_len;
86 struct rdac_mode_common common;
87 #define MODE6_MAX_LUN 32
88 u8 lun_table[MODE6_MAX_LUN];
89 u8 reserved2[32];
90 u8 reserved3;
91 u8 reserved4;
92 };
93
94 struct rdac_pg_expanded {
95 struct rdac_mode_10_hdr hdr;
96 u8 page_code;
97 u8 subpage_code;
98 u8 page_len[2];
99 struct rdac_mode_common common;
100 u8 lun_table[256];
101 u8 reserved3;
102 u8 reserved4;
103 };
104
105 struct c9_inquiry {
106 u8 peripheral_info;
107 u8 page_code; /* 0xC9 */
108 u8 reserved1;
109 u8 page_len;
110 u8 page_id[4]; /* "vace" */
111 u8 avte_cvp;
112 u8 path_prio;
113 u8 reserved2[38];
114 };
115
116 #define SUBSYS_ID_LEN 16
117 #define SLOT_ID_LEN 2
118 #define ARRAY_LABEL_LEN 31
119
120 struct c4_inquiry {
121 u8 peripheral_info;
122 u8 page_code; /* 0xC4 */
123 u8 reserved1;
124 u8 page_len;
125 u8 page_id[4]; /* "subs" */
126 u8 subsys_id[SUBSYS_ID_LEN];
127 u8 revision[4];
128 u8 slot_id[SLOT_ID_LEN];
129 u8 reserved[2];
130 };
131
132 #define UNIQUE_ID_LEN 16
133 struct c8_inquiry {
134 u8 peripheral_info;
135 u8 page_code; /* 0xC8 */
136 u8 reserved1;
137 u8 page_len;
138 u8 page_id[4]; /* "edid" */
139 u8 reserved2[3];
140 u8 vol_uniq_id_len;
141 u8 vol_uniq_id[16];
142 u8 vol_user_label_len;
143 u8 vol_user_label[60];
144 u8 array_uniq_id_len;
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
151 struct rdac_controller {
152 u8 array_id[UNIQUE_ID_LEN];
153 int use_ms10;
154 struct kref kref;
155 struct list_head node; /* list of all controllers */
156 union {
157 struct rdac_pg_legacy legacy;
158 struct rdac_pg_expanded expanded;
159 } mode_select;
160 u8 index;
161 u8 array_name[ARRAY_LABEL_LEN];
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
170 struct c2_inquiry {
171 u8 peripheral_info;
172 u8 page_code; /* 0xC2 */
173 u8 reserved1;
174 u8 page_len;
175 u8 page_id[4]; /* "swr4" */
176 u8 sw_version[3];
177 u8 sw_date[3];
178 u8 features_enabled;
179 u8 max_lun_supported;
180 u8 partitions[239]; /* Total allocation length should be 0xFF */
181 };
182
183 struct 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
214 static const char *mode[] = {
215 "RDAC",
216 "AVT",
217 "IOSHIP",
218 };
219 static const char *lun_state[] =
220 {
221 "unowned",
222 "owned",
223 };
224
225 struct 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
232 static LIST_HEAD(ctlr_list);
233 static DEFINE_SPINLOCK(list_lock);
234 static struct workqueue_struct *kmpath_rdacd;
235 static void send_mode_select(struct work_struct *work);
236
237 /*
238 * module parameter to enable rdac debug logging.
239 * 2 bits for each type of logging, only two types defined for now
240 * Can be enhanced if required at later point
241 */
242 static int rdac_logging = 1;
243 module_param(rdac_logging, int, S_IRUGO|S_IWUSR);
244 MODULE_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...) \
257 do { \
258 if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \
259 sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \
260 } while (0);
261
262 static 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
269 static 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
299 static 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 /* get request for block layer packet command */
340 rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE);
341 if (!rq)
342 return NULL;
343
344 /* Prepare the command. */
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
362 static void release_controller(struct kref *kref)
363 {
364 struct rdac_controller *ctlr;
365 ctlr = container_of(kref, struct rdac_controller, kref);
366
367 flush_workqueue(kmpath_rdacd);
368 spin_lock(&list_lock);
369 list_del(&ctlr->node);
370 spin_unlock(&list_lock);
371 kfree(ctlr);
372 }
373
374 static struct rdac_controller *get_controller(int index, char *array_name,
375 u8 *array_id, struct scsi_device *sdev)
376 {
377 struct rdac_controller *ctlr, *tmp;
378
379 spin_lock(&list_lock);
380
381 list_for_each_entry(tmp, &ctlr_list, node) {
382 if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) &&
383 (tmp->index == index) &&
384 (tmp->host == sdev->host)) {
385 kref_get(&tmp->kref);
386 spin_unlock(&list_lock);
387 return tmp;
388 }
389 }
390 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
391 if (!ctlr)
392 goto done;
393
394 /* initialize fields of controller */
395 memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN);
396 ctlr->index = index;
397 ctlr->host = sdev->host;
398 memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN);
399
400 kref_init(&ctlr->kref);
401 ctlr->use_ms10 = -1;
402 ctlr->ms_queued = 0;
403 ctlr->ms_sdev = NULL;
404 spin_lock_init(&ctlr->ms_lock);
405 INIT_WORK(&ctlr->ms_work, send_mode_select);
406 INIT_LIST_HEAD(&ctlr->ms_head);
407 list_add(&ctlr->node, &ctlr_list);
408 done:
409 spin_unlock(&list_lock);
410 return ctlr;
411 }
412
413 static int submit_inquiry(struct scsi_device *sdev, int page_code,
414 unsigned int len, struct rdac_dh_data *h)
415 {
416 struct request *rq;
417 struct request_queue *q = sdev->request_queue;
418 int err = SCSI_DH_RES_TEMP_UNAVAIL;
419
420 rq = get_rdac_req(sdev, &h->inq, len, READ);
421 if (!rq)
422 goto done;
423
424 /* Prepare the command. */
425 rq->cmd[0] = INQUIRY;
426 rq->cmd[1] = 1;
427 rq->cmd[2] = page_code;
428 rq->cmd[4] = len;
429 rq->cmd_len = COMMAND_SIZE(INQUIRY);
430
431 rq->sense = h->sense;
432 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
433 rq->sense_len = 0;
434
435 err = blk_execute_rq(q, NULL, rq, 1);
436 if (err == -EIO)
437 err = SCSI_DH_IO;
438
439 blk_put_request(rq);
440 done:
441 return err;
442 }
443
444 static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h,
445 char *array_name, u8 *array_id)
446 {
447 int err, i;
448 struct c8_inquiry *inqp;
449
450 err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h);
451 if (err == SCSI_DH_OK) {
452 inqp = &h->inq.c8;
453 if (inqp->page_code != 0xc8)
454 return SCSI_DH_NOSYS;
455 if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' ||
456 inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd')
457 return SCSI_DH_NOSYS;
458 h->lun = inqp->lun[7]; /* Uses only the last byte */
459
460 for(i=0; i<ARRAY_LABEL_LEN-1; ++i)
461 *(array_name+i) = inqp->array_user_label[(2*i)+1];
462
463 *(array_name+ARRAY_LABEL_LEN-1) = '\0';
464 memset(array_id, 0, UNIQUE_ID_LEN);
465 memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len);
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, u8 *array_id)
508 {
509 int err, index;
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 /* get the controller index */
516 if (inqp->slot_id[1] == 0x31)
517 index = 0;
518 else
519 index = 1;
520 h->ctlr = get_controller(index, array_name, array_id, sdev);
521 if (!h->ctlr)
522 err = SCSI_DH_RES_TEMP_UNAVAIL;
523 }
524 return err;
525 }
526
527 static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
528 {
529 int err;
530 struct c2_inquiry *inqp;
531
532 err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h);
533 if (err == SCSI_DH_OK) {
534 inqp = &h->inq.c2;
535 /*
536 * If more than MODE6_MAX_LUN luns are supported, use
537 * mode select 10
538 */
539 if (inqp->max_lun_supported >= MODE6_MAX_LUN)
540 h->ctlr->use_ms10 = 1;
541 else
542 h->ctlr->use_ms10 = 0;
543 }
544 return err;
545 }
546
547 static int mode_select_handle_sense(struct scsi_device *sdev,
548 unsigned char *sensebuf)
549 {
550 struct scsi_sense_hdr sense_hdr;
551 int err = SCSI_DH_IO, ret;
552 struct rdac_dh_data *h = get_rdac_data(sdev);
553
554 ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr);
555 if (!ret)
556 goto done;
557
558 switch (sense_hdr.sense_key) {
559 case NO_SENSE:
560 case ABORTED_COMMAND:
561 case UNIT_ATTENTION:
562 err = SCSI_DH_RETRY;
563 break;
564 case NOT_READY:
565 if (sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x01)
566 /* LUN Not Ready and is in the Process of Becoming
567 * Ready
568 */
569 err = SCSI_DH_RETRY;
570 break;
571 case ILLEGAL_REQUEST:
572 if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36)
573 /*
574 * Command Lock contention
575 */
576 err = SCSI_DH_RETRY;
577 break;
578 default:
579 break;
580 }
581
582 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
583 "MODE_SELECT returned with sense %02x/%02x/%02x",
584 (char *) h->ctlr->array_name, h->ctlr->index,
585 sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq);
586
587 done:
588 return err;
589 }
590
591 static void send_mode_select(struct work_struct *work)
592 {
593 struct rdac_controller *ctlr =
594 container_of(work, struct rdac_controller, ms_work);
595 struct request *rq;
596 struct scsi_device *sdev = ctlr->ms_sdev;
597 struct rdac_dh_data *h = get_rdac_data(sdev);
598 struct request_queue *q = sdev->request_queue;
599 int err, retry_cnt = RDAC_RETRY_COUNT;
600 struct rdac_queue_data *tmp, *qdata;
601 LIST_HEAD(list);
602
603 spin_lock(&ctlr->ms_lock);
604 list_splice_init(&ctlr->ms_head, &list);
605 ctlr->ms_queued = 0;
606 ctlr->ms_sdev = NULL;
607 spin_unlock(&ctlr->ms_lock);
608
609 retry:
610 err = SCSI_DH_RES_TEMP_UNAVAIL;
611 rq = rdac_failover_get(sdev, h, &list);
612 if (!rq)
613 goto done;
614
615 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
616 "%s MODE_SELECT command",
617 (char *) h->ctlr->array_name, h->ctlr->index,
618 (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying");
619
620 err = blk_execute_rq(q, NULL, rq, 1);
621 blk_put_request(rq);
622 if (err != SCSI_DH_OK) {
623 err = mode_select_handle_sense(sdev, h->sense);
624 if (err == SCSI_DH_RETRY && retry_cnt--)
625 goto retry;
626 }
627 if (err == SCSI_DH_OK) {
628 h->state = RDAC_STATE_ACTIVE;
629 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
630 "MODE_SELECT completed",
631 (char *) h->ctlr->array_name, h->ctlr->index);
632 }
633
634 done:
635 list_for_each_entry_safe(qdata, tmp, &list, entry) {
636 list_del(&qdata->entry);
637 if (err == SCSI_DH_OK)
638 qdata->h->state = RDAC_STATE_ACTIVE;
639 if (qdata->callback_fn)
640 qdata->callback_fn(qdata->callback_data, err);
641 kfree(qdata);
642 }
643 return;
644 }
645
646 static int queue_mode_select(struct scsi_device *sdev,
647 activate_complete fn, void *data)
648 {
649 struct rdac_queue_data *qdata;
650 struct rdac_controller *ctlr;
651
652 qdata = kzalloc(sizeof(*qdata), GFP_KERNEL);
653 if (!qdata)
654 return SCSI_DH_RETRY;
655
656 qdata->h = get_rdac_data(sdev);
657 qdata->callback_fn = fn;
658 qdata->callback_data = data;
659
660 ctlr = qdata->h->ctlr;
661 spin_lock(&ctlr->ms_lock);
662 list_add_tail(&qdata->entry, &ctlr->ms_head);
663 if (!ctlr->ms_queued) {
664 ctlr->ms_queued = 1;
665 ctlr->ms_sdev = sdev;
666 queue_work(kmpath_rdacd, &ctlr->ms_work);
667 }
668 spin_unlock(&ctlr->ms_lock);
669 return SCSI_DH_OK;
670 }
671
672 static int rdac_activate(struct scsi_device *sdev,
673 activate_complete fn, void *data)
674 {
675 struct rdac_dh_data *h = get_rdac_data(sdev);
676 int err = SCSI_DH_OK;
677 int act = 0;
678
679 err = check_ownership(sdev, h);
680 if (err != SCSI_DH_OK)
681 goto done;
682
683 switch (h->mode) {
684 case RDAC_MODE:
685 if (h->lun_state == RDAC_LUN_UNOWNED)
686 act = 1;
687 break;
688 case RDAC_MODE_IOSHIP:
689 if ((h->lun_state == RDAC_LUN_UNOWNED) &&
690 (h->preferred == RDAC_PREFERRED))
691 act = 1;
692 break;
693 default:
694 break;
695 }
696
697 if (act) {
698 err = queue_mode_select(sdev, fn, data);
699 if (err == SCSI_DH_OK)
700 return 0;
701 }
702 done:
703 if (fn)
704 fn(data, err);
705 return 0;
706 }
707
708 static int rdac_prep_fn(struct scsi_device *sdev, struct request *req)
709 {
710 struct rdac_dh_data *h = get_rdac_data(sdev);
711 int ret = BLKPREP_OK;
712
713 if (h->state != RDAC_STATE_ACTIVE) {
714 ret = BLKPREP_KILL;
715 req->cmd_flags |= REQ_QUIET;
716 }
717 return ret;
718
719 }
720
721 static int rdac_check_sense(struct scsi_device *sdev,
722 struct scsi_sense_hdr *sense_hdr)
723 {
724 struct rdac_dh_data *h = get_rdac_data(sdev);
725
726 RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, "
727 "I/O returned with sense %02x/%02x/%02x",
728 (char *) h->ctlr->array_name, h->ctlr->index,
729 sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
730
731 switch (sense_hdr->sense_key) {
732 case NOT_READY:
733 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
734 /* LUN Not Ready - Logical Unit Not Ready and is in
735 * the process of becoming ready
736 * Just retry.
737 */
738 return ADD_TO_MLQUEUE;
739 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81)
740 /* LUN Not Ready - Storage firmware incompatible
741 * Manual code synchonisation required.
742 *
743 * Nothing we can do here. Try to bypass the path.
744 */
745 return SUCCESS;
746 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1)
747 /* LUN Not Ready - Quiescense in progress
748 *
749 * Just retry and wait.
750 */
751 return ADD_TO_MLQUEUE;
752 if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02)
753 /* LUN Not Ready - Quiescense in progress
754 * or has been achieved
755 * Just retry.
756 */
757 return ADD_TO_MLQUEUE;
758 break;
759 case ILLEGAL_REQUEST:
760 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) {
761 /* Invalid Request - Current Logical Unit Ownership.
762 * Controller is not the current owner of the LUN,
763 * Fail the path, so that the other path be used.
764 */
765 h->state = RDAC_STATE_PASSIVE;
766 return SUCCESS;
767 }
768 break;
769 case UNIT_ATTENTION:
770 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
771 /*
772 * Power On, Reset, or Bus Device Reset, just retry.
773 */
774 return ADD_TO_MLQUEUE;
775 if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02)
776 /*
777 * Quiescence in progress , just retry.
778 */
779 return ADD_TO_MLQUEUE;
780 break;
781 }
782 /* success just means we do not care what scsi-ml does */
783 return SCSI_RETURN_NOT_HANDLED;
784 }
785
786 static const struct scsi_dh_devlist rdac_dev_list[] = {
787 {"IBM", "1722"},
788 {"IBM", "1724"},
789 {"IBM", "1726"},
790 {"IBM", "1742"},
791 {"IBM", "1745"},
792 {"IBM", "1746"},
793 {"IBM", "1814"},
794 {"IBM", "1815"},
795 {"IBM", "1818"},
796 {"IBM", "3526"},
797 {"SGI", "TP9400"},
798 {"SGI", "TP9500"},
799 {"SGI", "IS"},
800 {"STK", "OPENstorage D280"},
801 {"SUN", "CSM200_R"},
802 {"SUN", "LCSM100_I"},
803 {"SUN", "LCSM100_S"},
804 {"SUN", "LCSM100_E"},
805 {"SUN", "LCSM100_F"},
806 {"DELL", "MD3000"},
807 {"DELL", "MD3000i"},
808 {"DELL", "MD32xx"},
809 {"DELL", "MD32xxi"},
810 {"DELL", "MD36xxi"},
811 {"DELL", "MD36xxf"},
812 {"LSI", "INF-01-00"},
813 {"ENGENIO", "INF-01-00"},
814 {"STK", "FLEXLINE 380"},
815 {"SUN", "CSM100_R_FC"},
816 {"SUN", "STK6580_6780"},
817 {"SUN", "SUN_6180"},
818 {NULL, NULL},
819 };
820
821 static int rdac_bus_attach(struct scsi_device *sdev);
822 static void rdac_bus_detach(struct scsi_device *sdev);
823
824 static struct scsi_device_handler rdac_dh = {
825 .name = RDAC_NAME,
826 .module = THIS_MODULE,
827 .devlist = rdac_dev_list,
828 .prep_fn = rdac_prep_fn,
829 .check_sense = rdac_check_sense,
830 .attach = rdac_bus_attach,
831 .detach = rdac_bus_detach,
832 .activate = rdac_activate,
833 };
834
835 static int rdac_bus_attach(struct scsi_device *sdev)
836 {
837 struct scsi_dh_data *scsi_dh_data;
838 struct rdac_dh_data *h;
839 unsigned long flags;
840 int err;
841 char array_name[ARRAY_LABEL_LEN];
842 char array_id[UNIQUE_ID_LEN];
843
844 scsi_dh_data = kzalloc(sizeof(*scsi_dh_data)
845 + sizeof(*h) , GFP_KERNEL);
846 if (!scsi_dh_data) {
847 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
848 RDAC_NAME);
849 return 0;
850 }
851
852 scsi_dh_data->scsi_dh = &rdac_dh;
853 h = (struct rdac_dh_data *) scsi_dh_data->buf;
854 h->lun = UNINITIALIZED_LUN;
855 h->state = RDAC_STATE_ACTIVE;
856
857 err = get_lun_info(sdev, h, array_name, array_id);
858 if (err != SCSI_DH_OK)
859 goto failed;
860
861 err = initialize_controller(sdev, h, array_name, array_id);
862 if (err != SCSI_DH_OK)
863 goto failed;
864
865 err = check_ownership(sdev, h);
866 if (err != SCSI_DH_OK)
867 goto clean_ctlr;
868
869 err = set_mode_select(sdev, h);
870 if (err != SCSI_DH_OK)
871 goto clean_ctlr;
872
873 if (!try_module_get(THIS_MODULE))
874 goto clean_ctlr;
875
876 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
877 sdev->scsi_dh_data = scsi_dh_data;
878 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
879
880 sdev_printk(KERN_NOTICE, sdev,
881 "%s: LUN %d (%s) (%s)\n",
882 RDAC_NAME, h->lun, mode[(int)h->mode],
883 lun_state[(int)h->lun_state]);
884
885 return 0;
886
887 clean_ctlr:
888 kref_put(&h->ctlr->kref, release_controller);
889
890 failed:
891 kfree(scsi_dh_data);
892 sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
893 RDAC_NAME);
894 return -EINVAL;
895 }
896
897 static void rdac_bus_detach( struct scsi_device *sdev )
898 {
899 struct scsi_dh_data *scsi_dh_data;
900 struct rdac_dh_data *h;
901 unsigned long flags;
902
903 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
904 scsi_dh_data = sdev->scsi_dh_data;
905 sdev->scsi_dh_data = NULL;
906 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
907
908 h = (struct rdac_dh_data *) scsi_dh_data->buf;
909 if (h->ctlr)
910 kref_put(&h->ctlr->kref, release_controller);
911 kfree(scsi_dh_data);
912 module_put(THIS_MODULE);
913 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME);
914 }
915
916
917
918 static int __init rdac_init(void)
919 {
920 int r;
921
922 r = scsi_register_device_handler(&rdac_dh);
923 if (r != 0) {
924 printk(KERN_ERR "Failed to register scsi device handler.");
925 goto done;
926 }
927
928 /*
929 * Create workqueue to handle mode selects for rdac
930 */
931 kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd");
932 if (!kmpath_rdacd) {
933 scsi_unregister_device_handler(&rdac_dh);
934 printk(KERN_ERR "kmpath_rdacd creation failed.\n");
935 }
936 done:
937 return r;
938 }
939
940 static void __exit rdac_exit(void)
941 {
942 destroy_workqueue(kmpath_rdacd);
943 scsi_unregister_device_handler(&rdac_dh);
944 }
945
946 module_init(rdac_init);
947 module_exit(rdac_exit);
948
949 MODULE_DESCRIPTION("Multipath LSI/Engenio RDAC driver");
950 MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
951 MODULE_VERSION("01.00.0000.0000");
952 MODULE_LICENSE("GPL");
linux-next