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efi/arm: Fix boot crash with CONFIG_CPUMASK_OFFSTACK=y
[mirror_ubuntu-artful-kernel.git] / drivers / scsi / device_handler / scsi_dh_rdac.c
1 /*
2 * LSI/Engenio/NetApp E-Series 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 struct list_head dh_list;
169 };
170
171 struct c2_inquiry {
172 u8 peripheral_info;
173 u8 page_code; /* 0xC2 */
174 u8 reserved1;
175 u8 page_len;
176 u8 page_id[4]; /* "swr4" */
177 u8 sw_version[3];
178 u8 sw_date[3];
179 u8 features_enabled;
180 u8 max_lun_supported;
181 u8 partitions[239]; /* Total allocation length should be 0xFF */
182 };
183
184 struct rdac_dh_data {
185 struct list_head node;
186 struct rdac_controller *ctlr;
187 struct scsi_device *sdev;
188 #define UNINITIALIZED_LUN (1 << 8)
189 unsigned lun;
190
191 #define RDAC_MODE 0
192 #define RDAC_MODE_AVT 1
193 #define RDAC_MODE_IOSHIP 2
194 unsigned char mode;
195
196 #define RDAC_STATE_ACTIVE 0
197 #define RDAC_STATE_PASSIVE 1
198 unsigned char state;
199
200 #define RDAC_LUN_UNOWNED 0
201 #define RDAC_LUN_OWNED 1
202 char lun_state;
203
204 #define RDAC_PREFERRED 0
205 #define RDAC_NON_PREFERRED 1
206 char preferred;
207
208 union {
209 struct c2_inquiry c2;
210 struct c4_inquiry c4;
211 struct c8_inquiry c8;
212 struct c9_inquiry c9;
213 } inq;
214 };
215
216 static const char *mode[] = {
217 "RDAC",
218 "AVT",
219 "IOSHIP",
220 };
221 static const char *lun_state[] =
222 {
223 "unowned",
224 "owned",
225 };
226
227 struct rdac_queue_data {
228 struct list_head entry;
229 struct rdac_dh_data *h;
230 activate_complete callback_fn;
231 void *callback_data;
232 };
233
234 static LIST_HEAD(ctlr_list);
235 static DEFINE_SPINLOCK(list_lock);
236 static struct workqueue_struct *kmpath_rdacd;
237 static void send_mode_select(struct work_struct *work);
238
239 /*
240 * module parameter to enable rdac debug logging.
241 * 2 bits for each type of logging, only two types defined for now
242 * Can be enhanced if required at later point
243 */
244 static int rdac_logging = 1;
245 module_param(rdac_logging, int, S_IRUGO|S_IWUSR);
246 MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, "
247 "Default is 1 - failover logging enabled, "
248 "set it to 0xF to enable all the logs");
249
250 #define RDAC_LOG_FAILOVER 0
251 #define RDAC_LOG_SENSE 2
252
253 #define RDAC_LOG_BITS 2
254
255 #define RDAC_LOG_LEVEL(SHIFT) \
256 ((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1))
257
258 #define RDAC_LOG(SHIFT, sdev, f, arg...) \
259 do { \
260 if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \
261 sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \
262 } while (0);
263
264 static unsigned int rdac_failover_get(struct rdac_controller *ctlr,
265 struct list_head *list,
266 unsigned char *cdb)
267 {
268 struct scsi_device *sdev = ctlr->ms_sdev;
269 struct rdac_dh_data *h = sdev->handler_data;
270 struct rdac_mode_common *common;
271 unsigned data_size;
272 struct rdac_queue_data *qdata;
273 u8 *lun_table;
274
275 if (h->ctlr->use_ms10) {
276 struct rdac_pg_expanded *rdac_pg;
277
278 data_size = sizeof(struct rdac_pg_expanded);
279 rdac_pg = &h->ctlr->mode_select.expanded;
280 memset(rdac_pg, 0, data_size);
281 common = &rdac_pg->common;
282 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40;
283 rdac_pg->subpage_code = 0x1;
284 rdac_pg->page_len[0] = 0x01;
285 rdac_pg->page_len[1] = 0x28;
286 lun_table = rdac_pg->lun_table;
287 } else {
288 struct rdac_pg_legacy *rdac_pg;
289
290 data_size = sizeof(struct rdac_pg_legacy);
291 rdac_pg = &h->ctlr->mode_select.legacy;
292 memset(rdac_pg, 0, data_size);
293 common = &rdac_pg->common;
294 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER;
295 rdac_pg->page_len = 0x68;
296 lun_table = rdac_pg->lun_table;
297 }
298 common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS;
299 common->quiescence_timeout = RDAC_QUIESCENCE_TIME;
300 common->rdac_options = RDAC_FORCED_QUIESENCE;
301
302 list_for_each_entry(qdata, list, entry) {
303 lun_table[qdata->h->lun] = 0x81;
304 }
305
306 /* Prepare the command. */
307 if (h->ctlr->use_ms10) {
308 cdb[0] = MODE_SELECT_10;
309 cdb[7] = data_size >> 8;
310 cdb[8] = data_size & 0xff;
311 } else {
312 cdb[0] = MODE_SELECT;
313 cdb[4] = data_size;
314 }
315
316 return data_size;
317 }
318
319 static void release_controller(struct kref *kref)
320 {
321 struct rdac_controller *ctlr;
322 ctlr = container_of(kref, struct rdac_controller, kref);
323
324 list_del(&ctlr->node);
325 kfree(ctlr);
326 }
327
328 static struct rdac_controller *get_controller(int index, char *array_name,
329 u8 *array_id, struct scsi_device *sdev)
330 {
331 struct rdac_controller *ctlr, *tmp;
332
333 list_for_each_entry(tmp, &ctlr_list, node) {
334 if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) &&
335 (tmp->index == index) &&
336 (tmp->host == sdev->host)) {
337 kref_get(&tmp->kref);
338 return tmp;
339 }
340 }
341 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
342 if (!ctlr)
343 return NULL;
344
345 /* initialize fields of controller */
346 memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN);
347 ctlr->index = index;
348 ctlr->host = sdev->host;
349 memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN);
350
351 kref_init(&ctlr->kref);
352 ctlr->use_ms10 = -1;
353 ctlr->ms_queued = 0;
354 ctlr->ms_sdev = NULL;
355 spin_lock_init(&ctlr->ms_lock);
356 INIT_WORK(&ctlr->ms_work, send_mode_select);
357 INIT_LIST_HEAD(&ctlr->ms_head);
358 list_add(&ctlr->node, &ctlr_list);
359 INIT_LIST_HEAD(&ctlr->dh_list);
360
361 return ctlr;
362 }
363
364 static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h,
365 char *array_name, u8 *array_id)
366 {
367 int err = SCSI_DH_IO, i;
368 struct c8_inquiry *inqp = &h->inq.c8;
369
370 if (!scsi_get_vpd_page(sdev, 0xC8, (unsigned char *)inqp,
371 sizeof(struct c8_inquiry))) {
372 if (inqp->page_code != 0xc8)
373 return SCSI_DH_NOSYS;
374 if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' ||
375 inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd')
376 return SCSI_DH_NOSYS;
377 h->lun = inqp->lun[7]; /* Uses only the last byte */
378
379 for(i=0; i<ARRAY_LABEL_LEN-1; ++i)
380 *(array_name+i) = inqp->array_user_label[(2*i)+1];
381
382 *(array_name+ARRAY_LABEL_LEN-1) = '\0';
383 memset(array_id, 0, UNIQUE_ID_LEN);
384 memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len);
385 err = SCSI_DH_OK;
386 }
387 return err;
388 }
389
390 static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h)
391 {
392 int err = SCSI_DH_IO, access_state;
393 struct rdac_dh_data *tmp;
394 struct c9_inquiry *inqp = &h->inq.c9;
395
396 h->state = RDAC_STATE_ACTIVE;
397 if (!scsi_get_vpd_page(sdev, 0xC9, (unsigned char *)inqp,
398 sizeof(struct c9_inquiry))) {
399 /* detect the operating mode */
400 if ((inqp->avte_cvp >> 5) & 0x1)
401 h->mode = RDAC_MODE_IOSHIP; /* LUN in IOSHIP mode */
402 else if (inqp->avte_cvp >> 7)
403 h->mode = RDAC_MODE_AVT; /* LUN in AVT mode */
404 else
405 h->mode = RDAC_MODE; /* LUN in RDAC mode */
406
407 /* Update ownership */
408 if (inqp->avte_cvp & 0x1) {
409 h->lun_state = RDAC_LUN_OWNED;
410 access_state = SCSI_ACCESS_STATE_OPTIMAL;
411 } else {
412 h->lun_state = RDAC_LUN_UNOWNED;
413 if (h->mode == RDAC_MODE) {
414 h->state = RDAC_STATE_PASSIVE;
415 access_state = SCSI_ACCESS_STATE_STANDBY;
416 } else
417 access_state = SCSI_ACCESS_STATE_ACTIVE;
418 }
419
420 /* Update path prio*/
421 if (inqp->path_prio & 0x1) {
422 h->preferred = RDAC_PREFERRED;
423 access_state |= SCSI_ACCESS_STATE_PREFERRED;
424 } else
425 h->preferred = RDAC_NON_PREFERRED;
426 rcu_read_lock();
427 list_for_each_entry_rcu(tmp, &h->ctlr->dh_list, node) {
428 /* h->sdev should always be valid */
429 BUG_ON(!tmp->sdev);
430 tmp->sdev->access_state = access_state;
431 }
432 rcu_read_unlock();
433 err = SCSI_DH_OK;
434 }
435
436 return err;
437 }
438
439 static int initialize_controller(struct scsi_device *sdev,
440 struct rdac_dh_data *h, char *array_name, u8 *array_id)
441 {
442 int err = SCSI_DH_IO, index;
443 struct c4_inquiry *inqp = &h->inq.c4;
444
445 if (!scsi_get_vpd_page(sdev, 0xC4, (unsigned char *)inqp,
446 sizeof(struct c4_inquiry))) {
447 /* get the controller index */
448 if (inqp->slot_id[1] == 0x31)
449 index = 0;
450 else
451 index = 1;
452
453 spin_lock(&list_lock);
454 h->ctlr = get_controller(index, array_name, array_id, sdev);
455 if (!h->ctlr)
456 err = SCSI_DH_RES_TEMP_UNAVAIL;
457 else {
458 list_add_rcu(&h->node, &h->ctlr->dh_list);
459 h->sdev = sdev;
460 }
461 spin_unlock(&list_lock);
462 err = SCSI_DH_OK;
463 }
464 return err;
465 }
466
467 static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
468 {
469 int err = SCSI_DH_IO;
470 struct c2_inquiry *inqp = &h->inq.c2;
471
472 if (!scsi_get_vpd_page(sdev, 0xC2, (unsigned char *)inqp,
473 sizeof(struct c2_inquiry))) {
474 /*
475 * If more than MODE6_MAX_LUN luns are supported, use
476 * mode select 10
477 */
478 if (inqp->max_lun_supported >= MODE6_MAX_LUN)
479 h->ctlr->use_ms10 = 1;
480 else
481 h->ctlr->use_ms10 = 0;
482 err = SCSI_DH_OK;
483 }
484 return err;
485 }
486
487 static int mode_select_handle_sense(struct scsi_device *sdev,
488 struct scsi_sense_hdr *sense_hdr)
489 {
490 int err = SCSI_DH_IO;
491 struct rdac_dh_data *h = sdev->handler_data;
492
493 if (!scsi_sense_valid(sense_hdr))
494 goto done;
495
496 switch (sense_hdr->sense_key) {
497 case NO_SENSE:
498 case ABORTED_COMMAND:
499 case UNIT_ATTENTION:
500 err = SCSI_DH_RETRY;
501 break;
502 case NOT_READY:
503 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
504 /* LUN Not Ready and is in the Process of Becoming
505 * Ready
506 */
507 err = SCSI_DH_RETRY;
508 break;
509 case ILLEGAL_REQUEST:
510 if (sense_hdr->asc == 0x91 && sense_hdr->ascq == 0x36)
511 /*
512 * Command Lock contention
513 */
514 err = SCSI_DH_IMM_RETRY;
515 break;
516 default:
517 break;
518 }
519
520 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
521 "MODE_SELECT returned with sense %02x/%02x/%02x",
522 (char *) h->ctlr->array_name, h->ctlr->index,
523 sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
524
525 done:
526 return err;
527 }
528
529 static void send_mode_select(struct work_struct *work)
530 {
531 struct rdac_controller *ctlr =
532 container_of(work, struct rdac_controller, ms_work);
533 struct scsi_device *sdev = ctlr->ms_sdev;
534 struct rdac_dh_data *h = sdev->handler_data;
535 int err = SCSI_DH_OK, retry_cnt = RDAC_RETRY_COUNT;
536 struct rdac_queue_data *tmp, *qdata;
537 LIST_HEAD(list);
538 unsigned char cdb[COMMAND_SIZE(MODE_SELECT_10)];
539 struct scsi_sense_hdr sshdr;
540 unsigned int data_size;
541 u64 req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
542 REQ_FAILFAST_DRIVER;
543
544 spin_lock(&ctlr->ms_lock);
545 list_splice_init(&ctlr->ms_head, &list);
546 ctlr->ms_queued = 0;
547 ctlr->ms_sdev = NULL;
548 spin_unlock(&ctlr->ms_lock);
549
550 retry:
551 data_size = rdac_failover_get(ctlr, &list, cdb);
552
553 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
554 "%s MODE_SELECT command",
555 (char *) h->ctlr->array_name, h->ctlr->index,
556 (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying");
557
558 if (scsi_execute_req_flags(sdev, cdb, DMA_TO_DEVICE,
559 &h->ctlr->mode_select, data_size, &sshdr,
560 RDAC_TIMEOUT * HZ,
561 RDAC_RETRIES, NULL, req_flags, 0)) {
562 err = mode_select_handle_sense(sdev, &sshdr);
563 if (err == SCSI_DH_RETRY && retry_cnt--)
564 goto retry;
565 if (err == SCSI_DH_IMM_RETRY)
566 goto retry;
567 }
568 if (err == SCSI_DH_OK) {
569 h->state = RDAC_STATE_ACTIVE;
570 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
571 "MODE_SELECT completed",
572 (char *) h->ctlr->array_name, h->ctlr->index);
573 }
574
575 list_for_each_entry_safe(qdata, tmp, &list, entry) {
576 list_del(&qdata->entry);
577 if (err == SCSI_DH_OK)
578 qdata->h->state = RDAC_STATE_ACTIVE;
579 if (qdata->callback_fn)
580 qdata->callback_fn(qdata->callback_data, err);
581 kfree(qdata);
582 }
583 return;
584 }
585
586 static int queue_mode_select(struct scsi_device *sdev,
587 activate_complete fn, void *data)
588 {
589 struct rdac_queue_data *qdata;
590 struct rdac_controller *ctlr;
591
592 qdata = kzalloc(sizeof(*qdata), GFP_KERNEL);
593 if (!qdata)
594 return SCSI_DH_RETRY;
595
596 qdata->h = sdev->handler_data;
597 qdata->callback_fn = fn;
598 qdata->callback_data = data;
599
600 ctlr = qdata->h->ctlr;
601 spin_lock(&ctlr->ms_lock);
602 list_add_tail(&qdata->entry, &ctlr->ms_head);
603 if (!ctlr->ms_queued) {
604 ctlr->ms_queued = 1;
605 ctlr->ms_sdev = sdev;
606 queue_work(kmpath_rdacd, &ctlr->ms_work);
607 }
608 spin_unlock(&ctlr->ms_lock);
609 return SCSI_DH_OK;
610 }
611
612 static int rdac_activate(struct scsi_device *sdev,
613 activate_complete fn, void *data)
614 {
615 struct rdac_dh_data *h = sdev->handler_data;
616 int err = SCSI_DH_OK;
617 int act = 0;
618
619 err = check_ownership(sdev, h);
620 if (err != SCSI_DH_OK)
621 goto done;
622
623 switch (h->mode) {
624 case RDAC_MODE:
625 if (h->lun_state == RDAC_LUN_UNOWNED)
626 act = 1;
627 break;
628 case RDAC_MODE_IOSHIP:
629 if ((h->lun_state == RDAC_LUN_UNOWNED) &&
630 (h->preferred == RDAC_PREFERRED))
631 act = 1;
632 break;
633 default:
634 break;
635 }
636
637 if (act) {
638 err = queue_mode_select(sdev, fn, data);
639 if (err == SCSI_DH_OK)
640 return 0;
641 }
642 done:
643 if (fn)
644 fn(data, err);
645 return 0;
646 }
647
648 static int rdac_prep_fn(struct scsi_device *sdev, struct request *req)
649 {
650 struct rdac_dh_data *h = sdev->handler_data;
651 int ret = BLKPREP_OK;
652
653 if (h->state != RDAC_STATE_ACTIVE) {
654 ret = BLKPREP_KILL;
655 req->rq_flags |= RQF_QUIET;
656 }
657 return ret;
658
659 }
660
661 static int rdac_check_sense(struct scsi_device *sdev,
662 struct scsi_sense_hdr *sense_hdr)
663 {
664 struct rdac_dh_data *h = sdev->handler_data;
665
666 RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, "
667 "I/O returned with sense %02x/%02x/%02x",
668 (char *) h->ctlr->array_name, h->ctlr->index,
669 sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
670
671 switch (sense_hdr->sense_key) {
672 case NOT_READY:
673 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
674 /* LUN Not Ready - Logical Unit Not Ready and is in
675 * the process of becoming ready
676 * Just retry.
677 */
678 return ADD_TO_MLQUEUE;
679 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81)
680 /* LUN Not Ready - Storage firmware incompatible
681 * Manual code synchonisation required.
682 *
683 * Nothing we can do here. Try to bypass the path.
684 */
685 return SUCCESS;
686 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1)
687 /* LUN Not Ready - Quiescense in progress
688 *
689 * Just retry and wait.
690 */
691 return ADD_TO_MLQUEUE;
692 if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02)
693 /* LUN Not Ready - Quiescense in progress
694 * or has been achieved
695 * Just retry.
696 */
697 return ADD_TO_MLQUEUE;
698 break;
699 case ILLEGAL_REQUEST:
700 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) {
701 /* Invalid Request - Current Logical Unit Ownership.
702 * Controller is not the current owner of the LUN,
703 * Fail the path, so that the other path be used.
704 */
705 h->state = RDAC_STATE_PASSIVE;
706 return SUCCESS;
707 }
708 break;
709 case UNIT_ATTENTION:
710 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
711 /*
712 * Power On, Reset, or Bus Device Reset, just retry.
713 */
714 return ADD_TO_MLQUEUE;
715 if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02)
716 /*
717 * Quiescence in progress , just retry.
718 */
719 return ADD_TO_MLQUEUE;
720 break;
721 }
722 /* success just means we do not care what scsi-ml does */
723 return SCSI_RETURN_NOT_HANDLED;
724 }
725
726 static int rdac_bus_attach(struct scsi_device *sdev)
727 {
728 struct rdac_dh_data *h;
729 int err;
730 char array_name[ARRAY_LABEL_LEN];
731 char array_id[UNIQUE_ID_LEN];
732
733 h = kzalloc(sizeof(*h) , GFP_KERNEL);
734 if (!h)
735 return -ENOMEM;
736 h->lun = UNINITIALIZED_LUN;
737 h->state = RDAC_STATE_ACTIVE;
738
739 err = get_lun_info(sdev, h, array_name, array_id);
740 if (err != SCSI_DH_OK)
741 goto failed;
742
743 err = initialize_controller(sdev, h, array_name, array_id);
744 if (err != SCSI_DH_OK)
745 goto failed;
746
747 err = check_ownership(sdev, h);
748 if (err != SCSI_DH_OK)
749 goto clean_ctlr;
750
751 err = set_mode_select(sdev, h);
752 if (err != SCSI_DH_OK)
753 goto clean_ctlr;
754
755 sdev_printk(KERN_NOTICE, sdev,
756 "%s: LUN %d (%s) (%s)\n",
757 RDAC_NAME, h->lun, mode[(int)h->mode],
758 lun_state[(int)h->lun_state]);
759
760 sdev->handler_data = h;
761 return 0;
762
763 clean_ctlr:
764 spin_lock(&list_lock);
765 kref_put(&h->ctlr->kref, release_controller);
766 spin_unlock(&list_lock);
767
768 failed:
769 kfree(h);
770 return -EINVAL;
771 }
772
773 static void rdac_bus_detach( struct scsi_device *sdev )
774 {
775 struct rdac_dh_data *h = sdev->handler_data;
776
777 if (h->ctlr && h->ctlr->ms_queued)
778 flush_workqueue(kmpath_rdacd);
779
780 spin_lock(&list_lock);
781 if (h->ctlr) {
782 list_del_rcu(&h->node);
783 h->sdev = NULL;
784 kref_put(&h->ctlr->kref, release_controller);
785 }
786 spin_unlock(&list_lock);
787 sdev->handler_data = NULL;
788 kfree(h);
789 }
790
791 static struct scsi_device_handler rdac_dh = {
792 .name = RDAC_NAME,
793 .module = THIS_MODULE,
794 .prep_fn = rdac_prep_fn,
795 .check_sense = rdac_check_sense,
796 .attach = rdac_bus_attach,
797 .detach = rdac_bus_detach,
798 .activate = rdac_activate,
799 };
800
801 static int __init rdac_init(void)
802 {
803 int r;
804
805 r = scsi_register_device_handler(&rdac_dh);
806 if (r != 0) {
807 printk(KERN_ERR "Failed to register scsi device handler.");
808 goto done;
809 }
810
811 /*
812 * Create workqueue to handle mode selects for rdac
813 */
814 kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd");
815 if (!kmpath_rdacd) {
816 scsi_unregister_device_handler(&rdac_dh);
817 printk(KERN_ERR "kmpath_rdacd creation failed.\n");
818
819 r = -EINVAL;
820 }
821 done:
822 return r;
823 }
824
825 static void __exit rdac_exit(void)
826 {
827 destroy_workqueue(kmpath_rdacd);
828 scsi_unregister_device_handler(&rdac_dh);
829 }
830
831 module_init(rdac_init);
832 module_exit(rdac_exit);
833
834 MODULE_DESCRIPTION("Multipath LSI/Engenio/NetApp E-Series RDAC driver");
835 MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
836 MODULE_VERSION("01.00.0000.0000");
837 MODULE_LICENSE("GPL");
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