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Linux 4.19.133
[linux/fpc-iii.git] / drivers / scsi / device_handler / scsi_dh_rdac.c
blob6c629ef1bc4e328fbee9f18b1102380e82a5cdfb
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 rdac_mode_common *common;
269 unsigned data_size;
270 struct rdac_queue_data *qdata;
271 u8 *lun_table;
272
273 if (ctlr->use_ms10) {
274 struct rdac_pg_expanded *rdac_pg;
275
276 data_size = sizeof(struct rdac_pg_expanded);
277 rdac_pg = &ctlr->mode_select.expanded;
278 memset(rdac_pg, 0, data_size);
279 common = &rdac_pg->common;
280 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40;
281 rdac_pg->subpage_code = 0x1;
282 rdac_pg->page_len[0] = 0x01;
283 rdac_pg->page_len[1] = 0x28;
284 lun_table = rdac_pg->lun_table;
285 } else {
286 struct rdac_pg_legacy *rdac_pg;
287
288 data_size = sizeof(struct rdac_pg_legacy);
289 rdac_pg = &ctlr->mode_select.legacy;
290 memset(rdac_pg, 0, data_size);
291 common = &rdac_pg->common;
292 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER;
293 rdac_pg->page_len = 0x68;
294 lun_table = rdac_pg->lun_table;
295 }
296 common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS;
297 common->quiescence_timeout = RDAC_QUIESCENCE_TIME;
298 common->rdac_options = RDAC_FORCED_QUIESENCE;
299
300 list_for_each_entry(qdata, list, entry) {
301 lun_table[qdata->h->lun] = 0x81;
302 }
303
304 /* Prepare the command. */
305 if (ctlr->use_ms10) {
306 cdb[0] = MODE_SELECT_10;
307 cdb[7] = data_size >> 8;
308 cdb[8] = data_size & 0xff;
309 } else {
310 cdb[0] = MODE_SELECT;
311 cdb[4] = data_size;
312 }
313
314 return data_size;
315 }
316
317 static void release_controller(struct kref *kref)
318 {
319 struct rdac_controller *ctlr;
320 ctlr = container_of(kref, struct rdac_controller, kref);
321
322 list_del(&ctlr->node);
323 kfree(ctlr);
324 }
325
326 static struct rdac_controller *get_controller(int index, char *array_name,
327 u8 *array_id, struct scsi_device *sdev)
328 {
329 struct rdac_controller *ctlr, *tmp;
330
331 list_for_each_entry(tmp, &ctlr_list, node) {
332 if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) &&
333 (tmp->index == index) &&
334 (tmp->host == sdev->host)) {
335 kref_get(&tmp->kref);
336 return tmp;
337 }
338 }
339 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
340 if (!ctlr)
341 return NULL;
342
343 /* initialize fields of controller */
344 memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN);
345 ctlr->index = index;
346 ctlr->host = sdev->host;
347 memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN);
348
349 kref_init(&ctlr->kref);
350 ctlr->use_ms10 = -1;
351 ctlr->ms_queued = 0;
352 ctlr->ms_sdev = NULL;
353 spin_lock_init(&ctlr->ms_lock);
354 INIT_WORK(&ctlr->ms_work, send_mode_select);
355 INIT_LIST_HEAD(&ctlr->ms_head);
356 list_add(&ctlr->node, &ctlr_list);
357 INIT_LIST_HEAD(&ctlr->dh_list);
358
359 return ctlr;
360 }
361
362 static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h,
363 char *array_name, u8 *array_id)
364 {
365 int err = SCSI_DH_IO, i;
366 struct c8_inquiry *inqp = &h->inq.c8;
367
368 if (!scsi_get_vpd_page(sdev, 0xC8, (unsigned char *)inqp,
369 sizeof(struct c8_inquiry))) {
370 if (inqp->page_code != 0xc8)
371 return SCSI_DH_NOSYS;
372 if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' ||
373 inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd')
374 return SCSI_DH_NOSYS;
375 h->lun = inqp->lun[7]; /* Uses only the last byte */
376
377 for(i=0; i<ARRAY_LABEL_LEN-1; ++i)
378 *(array_name+i) = inqp->array_user_label[(2*i)+1];
379
380 *(array_name+ARRAY_LABEL_LEN-1) = '\0';
381 memset(array_id, 0, UNIQUE_ID_LEN);
382 memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len);
383 err = SCSI_DH_OK;
384 }
385 return err;
386 }
387
388 static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h)
389 {
390 int err = SCSI_DH_IO, access_state;
391 struct rdac_dh_data *tmp;
392 struct c9_inquiry *inqp = &h->inq.c9;
393
394 h->state = RDAC_STATE_ACTIVE;
395 if (!scsi_get_vpd_page(sdev, 0xC9, (unsigned char *)inqp,
396 sizeof(struct c9_inquiry))) {
397 /* detect the operating mode */
398 if ((inqp->avte_cvp >> 5) & 0x1)
399 h->mode = RDAC_MODE_IOSHIP; /* LUN in IOSHIP mode */
400 else if (inqp->avte_cvp >> 7)
401 h->mode = RDAC_MODE_AVT; /* LUN in AVT mode */
402 else
403 h->mode = RDAC_MODE; /* LUN in RDAC mode */
404
405 /* Update ownership */
406 if (inqp->avte_cvp & 0x1) {
407 h->lun_state = RDAC_LUN_OWNED;
408 access_state = SCSI_ACCESS_STATE_OPTIMAL;
409 } else {
410 h->lun_state = RDAC_LUN_UNOWNED;
411 if (h->mode == RDAC_MODE) {
412 h->state = RDAC_STATE_PASSIVE;
413 access_state = SCSI_ACCESS_STATE_STANDBY;
414 } else
415 access_state = SCSI_ACCESS_STATE_ACTIVE;
416 }
417
418 /* Update path prio*/
419 if (inqp->path_prio & 0x1) {
420 h->preferred = RDAC_PREFERRED;
421 access_state |= SCSI_ACCESS_STATE_PREFERRED;
422 } else
423 h->preferred = RDAC_NON_PREFERRED;
424 rcu_read_lock();
425 list_for_each_entry_rcu(tmp, &h->ctlr->dh_list, node) {
426 /* h->sdev should always be valid */
427 BUG_ON(!tmp->sdev);
428 tmp->sdev->access_state = access_state;
429 }
430 rcu_read_unlock();
431 err = SCSI_DH_OK;
432 }
433
434 return err;
435 }
436
437 static int initialize_controller(struct scsi_device *sdev,
438 struct rdac_dh_data *h, char *array_name, u8 *array_id)
439 {
440 int err = SCSI_DH_IO, index;
441 struct c4_inquiry *inqp = &h->inq.c4;
442
443 if (!scsi_get_vpd_page(sdev, 0xC4, (unsigned char *)inqp,
444 sizeof(struct c4_inquiry))) {
445 /* get the controller index */
446 if (inqp->slot_id[1] == 0x31)
447 index = 0;
448 else
449 index = 1;
450
451 spin_lock(&list_lock);
452 h->ctlr = get_controller(index, array_name, array_id, sdev);
453 if (!h->ctlr)
454 err = SCSI_DH_RES_TEMP_UNAVAIL;
455 else {
456 list_add_rcu(&h->node, &h->ctlr->dh_list);
457 h->sdev = sdev;
458 }
459 spin_unlock(&list_lock);
460 err = SCSI_DH_OK;
461 }
462 return err;
463 }
464
465 static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
466 {
467 int err = SCSI_DH_IO;
468 struct c2_inquiry *inqp = &h->inq.c2;
469
470 if (!scsi_get_vpd_page(sdev, 0xC2, (unsigned char *)inqp,
471 sizeof(struct c2_inquiry))) {
472 /*
473 * If more than MODE6_MAX_LUN luns are supported, use
474 * mode select 10
475 */
476 if (inqp->max_lun_supported >= MODE6_MAX_LUN)
477 h->ctlr->use_ms10 = 1;
478 else
479 h->ctlr->use_ms10 = 0;
480 err = SCSI_DH_OK;
481 }
482 return err;
483 }
484
485 static int mode_select_handle_sense(struct scsi_device *sdev,
486 struct scsi_sense_hdr *sense_hdr)
487 {
488 int err = SCSI_DH_IO;
489 struct rdac_dh_data *h = sdev->handler_data;
490
491 if (!scsi_sense_valid(sense_hdr))
492 goto done;
493
494 switch (sense_hdr->sense_key) {
495 case NO_SENSE:
496 case ABORTED_COMMAND:
497 case UNIT_ATTENTION:
498 err = SCSI_DH_RETRY;
499 break;
500 case NOT_READY:
501 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
502 /* LUN Not Ready and is in the Process of Becoming
503 * Ready
504 */
505 err = SCSI_DH_RETRY;
506 break;
507 case ILLEGAL_REQUEST:
508 if (sense_hdr->asc == 0x91 && sense_hdr->ascq == 0x36)
509 /*
510 * Command Lock contention
511 */
512 err = SCSI_DH_IMM_RETRY;
513 break;
514 default:
515 break;
516 }
517
518 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
519 "MODE_SELECT returned with sense %02x/%02x/%02x",
520 (char *) h->ctlr->array_name, h->ctlr->index,
521 sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
522
523 done:
524 return err;
525 }
526
527 static void send_mode_select(struct work_struct *work)
528 {
529 struct rdac_controller *ctlr =
530 container_of(work, struct rdac_controller, ms_work);
531 struct scsi_device *sdev = ctlr->ms_sdev;
532 struct rdac_dh_data *h = sdev->handler_data;
533 int err = SCSI_DH_OK, retry_cnt = RDAC_RETRY_COUNT;
534 struct rdac_queue_data *tmp, *qdata;
535 LIST_HEAD(list);
536 unsigned char cdb[MAX_COMMAND_SIZE];
537 struct scsi_sense_hdr sshdr;
538 unsigned int data_size;
539 u64 req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
540 REQ_FAILFAST_DRIVER;
541
542 spin_lock(&ctlr->ms_lock);
543 list_splice_init(&ctlr->ms_head, &list);
544 ctlr->ms_queued = 0;
545 ctlr->ms_sdev = NULL;
546 spin_unlock(&ctlr->ms_lock);
547
548 retry:
549 memset(cdb, 0, sizeof(cdb));
550
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(sdev, cdb, DMA_TO_DEVICE, &h->ctlr->mode_select,
559 data_size, NULL, &sshdr, RDAC_TIMEOUT * HZ,
560 RDAC_RETRIES, req_flags, 0, NULL)) {
561 err = mode_select_handle_sense(sdev, &sshdr);
562 if (err == SCSI_DH_RETRY && retry_cnt--)
563 goto retry;
564 if (err == SCSI_DH_IMM_RETRY)
565 goto retry;
566 }
567 if (err == SCSI_DH_OK) {
568 h->state = RDAC_STATE_ACTIVE;
569 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
570 "MODE_SELECT completed",
571 (char *) h->ctlr->array_name, h->ctlr->index);
572 }
573
574 list_for_each_entry_safe(qdata, tmp, &list, entry) {
575 list_del(&qdata->entry);
576 if (err == SCSI_DH_OK)
577 qdata->h->state = RDAC_STATE_ACTIVE;
578 if (qdata->callback_fn)
579 qdata->callback_fn(qdata->callback_data, err);
580 kfree(qdata);
581 }
582 return;
583 }
584
585 static int queue_mode_select(struct scsi_device *sdev,
586 activate_complete fn, void *data)
587 {
588 struct rdac_queue_data *qdata;
589 struct rdac_controller *ctlr;
590
591 qdata = kzalloc(sizeof(*qdata), GFP_KERNEL);
592 if (!qdata)
593 return SCSI_DH_RETRY;
594
595 qdata->h = sdev->handler_data;
596 qdata->callback_fn = fn;
597 qdata->callback_data = data;
598
599 ctlr = qdata->h->ctlr;
600 spin_lock(&ctlr->ms_lock);
601 list_add_tail(&qdata->entry, &ctlr->ms_head);
602 if (!ctlr->ms_queued) {
603 ctlr->ms_queued = 1;
604 ctlr->ms_sdev = sdev;
605 queue_work(kmpath_rdacd, &ctlr->ms_work);
606 }
607 spin_unlock(&ctlr->ms_lock);
608 return SCSI_DH_OK;
609 }
610
611 static int rdac_activate(struct scsi_device *sdev,
612 activate_complete fn, void *data)
613 {
614 struct rdac_dh_data *h = sdev->handler_data;
615 int err = SCSI_DH_OK;
616 int act = 0;
617
618 err = check_ownership(sdev, h);
619 if (err != SCSI_DH_OK)
620 goto done;
621
622 switch (h->mode) {
623 case RDAC_MODE:
624 if (h->lun_state == RDAC_LUN_UNOWNED)
625 act = 1;
626 break;
627 case RDAC_MODE_IOSHIP:
628 if ((h->lun_state == RDAC_LUN_UNOWNED) &&
629 (h->preferred == RDAC_PREFERRED))
630 act = 1;
631 break;
632 default:
633 break;
634 }
635
636 if (act) {
637 err = queue_mode_select(sdev, fn, data);
638 if (err == SCSI_DH_OK)
639 return 0;
640 }
641 done:
642 if (fn)
643 fn(data, err);
644 return 0;
645 }
646
647 static int rdac_prep_fn(struct scsi_device *sdev, struct request *req)
648 {
649 struct rdac_dh_data *h = sdev->handler_data;
650 int ret = BLKPREP_OK;
651
652 if (h->state != RDAC_STATE_ACTIVE) {
653 ret = BLKPREP_KILL;
654 req->rq_flags |= RQF_QUIET;
655 }
656 return ret;
657
658 }
659
660 static int rdac_check_sense(struct scsi_device *sdev,
661 struct scsi_sense_hdr *sense_hdr)
662 {
663 struct rdac_dh_data *h = sdev->handler_data;
664
665 RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, "
666 "I/O returned with sense %02x/%02x/%02x",
667 (char *) h->ctlr->array_name, h->ctlr->index,
668 sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
669
670 switch (sense_hdr->sense_key) {
671 case NOT_READY:
672 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
673 /* LUN Not Ready - Logical Unit Not Ready and is in
674 * the process of becoming ready
675 * Just retry.
676 */
677 return ADD_TO_MLQUEUE;
678 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81)
679 /* LUN Not Ready - Storage firmware incompatible
680 * Manual code synchonisation required.
681 *
682 * Nothing we can do here. Try to bypass the path.
683 */
684 return SUCCESS;
685 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1)
686 /* LUN Not Ready - Quiescense in progress
687 *
688 * Just retry and wait.
689 */
690 return ADD_TO_MLQUEUE;
691 if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02)
692 /* LUN Not Ready - Quiescense in progress
693 * or has been achieved
694 * Just retry.
695 */
696 return ADD_TO_MLQUEUE;
697 break;
698 case ILLEGAL_REQUEST:
699 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) {
700 /* Invalid Request - Current Logical Unit Ownership.
701 * Controller is not the current owner of the LUN,
702 * Fail the path, so that the other path be used.
703 */
704 h->state = RDAC_STATE_PASSIVE;
705 return SUCCESS;
706 }
707 break;
708 case UNIT_ATTENTION:
709 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
710 /*
711 * Power On, Reset, or Bus Device Reset, just retry.
712 */
713 return ADD_TO_MLQUEUE;
714 if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02)
715 /*
716 * Quiescence in progress , just retry.
717 */
718 return ADD_TO_MLQUEUE;
719 break;
720 }
721 /* success just means we do not care what scsi-ml does */
722 return SCSI_RETURN_NOT_HANDLED;
723 }
724
725 static int rdac_bus_attach(struct scsi_device *sdev)
726 {
727 struct rdac_dh_data *h;
728 int err;
729 char array_name[ARRAY_LABEL_LEN];
730 char array_id[UNIQUE_ID_LEN];
731
732 h = kzalloc(sizeof(*h) , GFP_KERNEL);
733 if (!h)
734 return SCSI_DH_NOMEM;
735 h->lun = UNINITIALIZED_LUN;
736 h->state = RDAC_STATE_ACTIVE;
737
738 err = get_lun_info(sdev, h, array_name, array_id);
739 if (err != SCSI_DH_OK)
740 goto failed;
741
742 err = initialize_controller(sdev, h, array_name, array_id);
743 if (err != SCSI_DH_OK)
744 goto failed;
745
746 err = check_ownership(sdev, h);
747 if (err != SCSI_DH_OK)
748 goto clean_ctlr;
749
750 err = set_mode_select(sdev, h);
751 if (err != SCSI_DH_OK)
752 goto clean_ctlr;
753
754 sdev_printk(KERN_NOTICE, sdev,
755 "%s: LUN %d (%s) (%s)\n",
756 RDAC_NAME, h->lun, mode[(int)h->mode],
757 lun_state[(int)h->lun_state]);
758
759 sdev->handler_data = h;
760 return SCSI_DH_OK;
761
762 clean_ctlr:
763 spin_lock(&list_lock);
764 kref_put(&h->ctlr->kref, release_controller);
765 spin_unlock(&list_lock);
766
767 failed:
768 kfree(h);
769 return err;
770 }
771
772 static void rdac_bus_detach( struct scsi_device *sdev )
773 {
774 struct rdac_dh_data *h = sdev->handler_data;
775
776 if (h->ctlr && h->ctlr->ms_queued)
777 flush_workqueue(kmpath_rdacd);
778
779 spin_lock(&list_lock);
780 if (h->ctlr) {
781 list_del_rcu(&h->node);
782 h->sdev = NULL;
783 kref_put(&h->ctlr->kref, release_controller);
784 }
785 spin_unlock(&list_lock);
786 sdev->handler_data = NULL;
787 kfree(h);
788 }
789
790 static struct scsi_device_handler rdac_dh = {
791 .name = RDAC_NAME,
792 .module = THIS_MODULE,
793 .prep_fn = rdac_prep_fn,
794 .check_sense = rdac_check_sense,
795 .attach = rdac_bus_attach,
796 .detach = rdac_bus_detach,
797 .activate = rdac_activate,
798 };
799
800 static int __init rdac_init(void)
801 {
802 int r;
803
804 r = scsi_register_device_handler(&rdac_dh);
805 if (r != 0) {
806 printk(KERN_ERR "Failed to register scsi device handler.");
807 goto done;
808 }
809
810 /*
811 * Create workqueue to handle mode selects for rdac
812 */
813 kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd");
814 if (!kmpath_rdacd) {
815 scsi_unregister_device_handler(&rdac_dh);
816 printk(KERN_ERR "kmpath_rdacd creation failed.\n");
817
818 r = -EINVAL;
819 }
820 done:
821 return r;
822 }
823
824 static void __exit rdac_exit(void)
825 {
826 destroy_workqueue(kmpath_rdacd);
827 scsi_unregister_device_handler(&rdac_dh);
828 }
829
830 module_init(rdac_init);
831 module_exit(rdac_exit);
832
833 MODULE_DESCRIPTION("Multipath LSI/Engenio/NetApp E-Series RDAC driver");
834 MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
835 MODULE_VERSION("01.00.0000.0000");
836 MODULE_LICENSE("GPL");
Linux with added FPC-III support