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Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -07001/*
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
26#define RDAC_NAME "rdac"
Chandra Seetharamanc85f8cb92008-11-05 20:06:37 -080027#define RDAC_RETRY_COUNT 5
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -070028
29/*
30 * LSI mode page stuff
31 *
32 * These struct definitions and the forming of the
33 * mode page were taken from the LSI RDAC 2.4 GPL'd
34 * driver, and then converted to Linux conventions.
35 */
36#define RDAC_QUIESCENCE_TIME 20;
37/*
38 * Page Codes
39 */
40#define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c
41
42/*
43 * Controller modes definitions
44 */
45#define RDAC_MODE_TRANSFER_SPECIFIED_LUNS 0x02
46
47/*
48 * RDAC Options field
49 */
50#define RDAC_FORCED_QUIESENCE 0x02
51
52#define RDAC_TIMEOUT (60 * HZ)
53#define RDAC_RETRIES 3
54
55struct rdac_mode_6_hdr {
56 u8 data_len;
57 u8 medium_type;
58 u8 device_params;
59 u8 block_desc_len;
60};
61
62struct rdac_mode_10_hdr {
63 u16 data_len;
64 u8 medium_type;
65 u8 device_params;
66 u16 reserved;
67 u16 block_desc_len;
68};
69
70struct rdac_mode_common {
71 u8 controller_serial[16];
72 u8 alt_controller_serial[16];
73 u8 rdac_mode[2];
74 u8 alt_rdac_mode[2];
75 u8 quiescence_timeout;
76 u8 rdac_options;
77};
78
79struct rdac_pg_legacy {
80 struct rdac_mode_6_hdr hdr;
81 u8 page_code;
82 u8 page_len;
83 struct rdac_mode_common common;
84#define MODE6_MAX_LUN 32
85 u8 lun_table[MODE6_MAX_LUN];
86 u8 reserved2[32];
87 u8 reserved3;
88 u8 reserved4;
89};
90
91struct rdac_pg_expanded {
92 struct rdac_mode_10_hdr hdr;
93 u8 page_code;
94 u8 subpage_code;
95 u8 page_len[2];
96 struct rdac_mode_common common;
97 u8 lun_table[256];
98 u8 reserved3;
99 u8 reserved4;
100};
101
102struct c9_inquiry {
103 u8 peripheral_info;
104 u8 page_code; /* 0xC9 */
105 u8 reserved1;
106 u8 page_len;
107 u8 page_id[4]; /* "vace" */
108 u8 avte_cvp;
109 u8 path_prio;
110 u8 reserved2[38];
111};
112
113#define SUBSYS_ID_LEN 16
114#define SLOT_ID_LEN 2
Moger, Babu15276662009-09-03 21:42:21 -0600115#define ARRAY_LABEL_LEN 31
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700116
117struct c4_inquiry {
118 u8 peripheral_info;
119 u8 page_code; /* 0xC4 */
120 u8 reserved1;
121 u8 page_len;
122 u8 page_id[4]; /* "subs" */
123 u8 subsys_id[SUBSYS_ID_LEN];
124 u8 revision[4];
125 u8 slot_id[SLOT_ID_LEN];
126 u8 reserved[2];
127};
128
129struct rdac_controller {
130 u8 subsys_id[SUBSYS_ID_LEN];
131 u8 slot_id[SLOT_ID_LEN];
132 int use_ms10;
133 struct kref kref;
134 struct list_head node; /* list of all controllers */
135 union {
136 struct rdac_pg_legacy legacy;
137 struct rdac_pg_expanded expanded;
138 } mode_select;
Moger, Babu15276662009-09-03 21:42:21 -0600139 u8 index;
140 u8 array_name[ARRAY_LABEL_LEN];
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700141};
142struct c8_inquiry {
143 u8 peripheral_info;
144 u8 page_code; /* 0xC8 */
145 u8 reserved1;
146 u8 page_len;
147 u8 page_id[4]; /* "edid" */
148 u8 reserved2[3];
149 u8 vol_uniq_id_len;
150 u8 vol_uniq_id[16];
151 u8 vol_user_label_len;
152 u8 vol_user_label[60];
153 u8 array_uniq_id_len;
154 u8 array_unique_id[16];
155 u8 array_user_label_len;
156 u8 array_user_label[60];
157 u8 lun[8];
158};
159
160struct c2_inquiry {
161 u8 peripheral_info;
162 u8 page_code; /* 0xC2 */
163 u8 reserved1;
164 u8 page_len;
165 u8 page_id[4]; /* "swr4" */
166 u8 sw_version[3];
167 u8 sw_date[3];
168 u8 features_enabled;
169 u8 max_lun_supported;
170 u8 partitions[239]; /* Total allocation length should be 0xFF */
171};
172
173struct rdac_dh_data {
174 struct rdac_controller *ctlr;
175#define UNINITIALIZED_LUN (1 << 8)
176 unsigned lun;
177#define RDAC_STATE_ACTIVE 0
178#define RDAC_STATE_PASSIVE 1
179 unsigned char state;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700180
181#define RDAC_LUN_UNOWNED 0
182#define RDAC_LUN_OWNED 1
183#define RDAC_LUN_AVT 2
184 char lun_state;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700185 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
186 union {
187 struct c2_inquiry c2;
188 struct c4_inquiry c4;
189 struct c8_inquiry c8;
190 struct c9_inquiry c9;
191 } inq;
192};
193
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700194static const char *lun_state[] =
195{
196 "unowned",
197 "owned",
198 "owned (AVT mode)",
199};
200
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700201static LIST_HEAD(ctlr_list);
202static DEFINE_SPINLOCK(list_lock);
203
204static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev)
205{
206 struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
207 BUG_ON(scsi_dh_data == NULL);
208 return ((struct rdac_dh_data *) scsi_dh_data->buf);
209}
210
211static struct request *get_rdac_req(struct scsi_device *sdev,
212 void *buffer, unsigned buflen, int rw)
213{
214 struct request *rq;
215 struct request_queue *q = sdev->request_queue;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700216
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700217 rq = blk_get_request(q, rw, GFP_NOIO);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700218
219 if (!rq) {
220 sdev_printk(KERN_INFO, sdev,
221 "get_rdac_req: blk_get_request failed.\n");
222 return NULL;
223 }
224
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700225 if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700226 blk_put_request(rq);
227 sdev_printk(KERN_INFO, sdev,
228 "get_rdac_req: blk_rq_map_kern failed.\n");
229 return NULL;
230 }
231
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700232 rq->cmd_type = REQ_TYPE_BLOCK_PC;
Mike Christie6000a362008-08-19 18:45:30 -0500233 rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
234 REQ_FAILFAST_DRIVER;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700235 rq->retries = RDAC_RETRIES;
236 rq->timeout = RDAC_TIMEOUT;
237
238 return rq;
239}
240
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700241static struct request *rdac_failover_get(struct scsi_device *sdev,
242 struct rdac_dh_data *h)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700243{
244 struct request *rq;
245 struct rdac_mode_common *common;
246 unsigned data_size;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700247
248 if (h->ctlr->use_ms10) {
249 struct rdac_pg_expanded *rdac_pg;
250
251 data_size = sizeof(struct rdac_pg_expanded);
252 rdac_pg = &h->ctlr->mode_select.expanded;
253 memset(rdac_pg, 0, data_size);
254 common = &rdac_pg->common;
255 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40;
256 rdac_pg->subpage_code = 0x1;
257 rdac_pg->page_len[0] = 0x01;
258 rdac_pg->page_len[1] = 0x28;
259 rdac_pg->lun_table[h->lun] = 0x81;
260 } else {
261 struct rdac_pg_legacy *rdac_pg;
262
263 data_size = sizeof(struct rdac_pg_legacy);
264 rdac_pg = &h->ctlr->mode_select.legacy;
265 memset(rdac_pg, 0, data_size);
266 common = &rdac_pg->common;
267 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER;
268 rdac_pg->page_len = 0x68;
269 rdac_pg->lun_table[h->lun] = 0x81;
270 }
271 common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS;
272 common->quiescence_timeout = RDAC_QUIESCENCE_TIME;
273 common->rdac_options = RDAC_FORCED_QUIESENCE;
274
275 /* get request for block layer packet command */
276 rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE);
277 if (!rq)
278 return NULL;
279
280 /* Prepare the command. */
281 if (h->ctlr->use_ms10) {
282 rq->cmd[0] = MODE_SELECT_10;
283 rq->cmd[7] = data_size >> 8;
284 rq->cmd[8] = data_size & 0xff;
285 } else {
286 rq->cmd[0] = MODE_SELECT;
287 rq->cmd[4] = data_size;
288 }
289 rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
290
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700291 rq->sense = h->sense;
292 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
293 rq->sense_len = 0;
294
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700295 return rq;
296}
297
298static void release_controller(struct kref *kref)
299{
300 struct rdac_controller *ctlr;
301 ctlr = container_of(kref, struct rdac_controller, kref);
302
303 spin_lock(&list_lock);
304 list_del(&ctlr->node);
305 spin_unlock(&list_lock);
306 kfree(ctlr);
307}
308
Moger, Babu15276662009-09-03 21:42:21 -0600309static struct rdac_controller *get_controller(u8 *subsys_id, u8 *slot_id,
310 char *array_name)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700311{
312 struct rdac_controller *ctlr, *tmp;
313
314 spin_lock(&list_lock);
315
316 list_for_each_entry(tmp, &ctlr_list, node) {
317 if ((memcmp(tmp->subsys_id, subsys_id, SUBSYS_ID_LEN) == 0) &&
318 (memcmp(tmp->slot_id, slot_id, SLOT_ID_LEN) == 0)) {
319 kref_get(&tmp->kref);
320 spin_unlock(&list_lock);
321 return tmp;
322 }
323 }
324 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
325 if (!ctlr)
326 goto done;
327
328 /* initialize fields of controller */
329 memcpy(ctlr->subsys_id, subsys_id, SUBSYS_ID_LEN);
330 memcpy(ctlr->slot_id, slot_id, SLOT_ID_LEN);
Moger, Babu15276662009-09-03 21:42:21 -0600331 memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN);
332
333 /* update the controller index */
334 if (slot_id[1] == 0x31)
335 ctlr->index = 0;
336 else
337 ctlr->index = 1;
338
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700339 kref_init(&ctlr->kref);
340 ctlr->use_ms10 = -1;
341 list_add(&ctlr->node, &ctlr_list);
342done:
343 spin_unlock(&list_lock);
344 return ctlr;
345}
346
347static int submit_inquiry(struct scsi_device *sdev, int page_code,
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700348 unsigned int len, struct rdac_dh_data *h)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700349{
350 struct request *rq;
351 struct request_queue *q = sdev->request_queue;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700352 int err = SCSI_DH_RES_TEMP_UNAVAIL;
353
354 rq = get_rdac_req(sdev, &h->inq, len, READ);
355 if (!rq)
356 goto done;
357
358 /* Prepare the command. */
359 rq->cmd[0] = INQUIRY;
360 rq->cmd[1] = 1;
361 rq->cmd[2] = page_code;
362 rq->cmd[4] = len;
363 rq->cmd_len = COMMAND_SIZE(INQUIRY);
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700364
365 rq->sense = h->sense;
366 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
367 rq->sense_len = 0;
368
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700369 err = blk_execute_rq(q, NULL, rq, 1);
370 if (err == -EIO)
371 err = SCSI_DH_IO;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700372
373 blk_put_request(rq);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700374done:
375 return err;
376}
377
Moger, Babu15276662009-09-03 21:42:21 -0600378static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h,
379 char *array_name)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700380{
Moger, Babu15276662009-09-03 21:42:21 -0600381 int err, i;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700382 struct c8_inquiry *inqp;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700383
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700384 err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700385 if (err == SCSI_DH_OK) {
386 inqp = &h->inq.c8;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700387 if (inqp->page_code != 0xc8)
388 return SCSI_DH_NOSYS;
389 if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' ||
390 inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd')
391 return SCSI_DH_NOSYS;
Chandra Seetharaman8479fca2008-08-12 17:26:58 -0700392 h->lun = inqp->lun[7]; /* Uses only the last byte */
Moger, Babu15276662009-09-03 21:42:21 -0600393
394 for(i=0; i<ARRAY_LABEL_LEN-1; ++i)
395 *(array_name+i) = inqp->array_user_label[(2*i)+1];
396
397 *(array_name+ARRAY_LABEL_LEN-1) = '\0';
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700398 }
399 return err;
400}
401
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700402static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700403{
404 int err;
405 struct c9_inquiry *inqp;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700406
Chandra Seetharamanfe426252008-08-12 17:26:59 -0700407 h->lun_state = RDAC_LUN_UNOWNED;
Chandra Seetharaman9eece962008-11-05 20:05:21 -0800408 h->state = RDAC_STATE_ACTIVE;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700409 err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700410 if (err == SCSI_DH_OK) {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700411 inqp = &h->inq.c9;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700412 if ((inqp->avte_cvp >> 7) == 0x1) {
413 /* LUN in AVT mode */
414 sdev_printk(KERN_NOTICE, sdev,
415 "%s: AVT mode detected\n",
416 RDAC_NAME);
417 h->lun_state = RDAC_LUN_AVT;
418 } else if ((inqp->avte_cvp & 0x1) != 0) {
419 /* LUN was owned by the controller */
420 h->lun_state = RDAC_LUN_OWNED;
421 }
422 }
423
Chandra Seetharaman5a367562008-08-21 23:12:40 -0700424 if (h->lun_state == RDAC_LUN_UNOWNED)
425 h->state = RDAC_STATE_PASSIVE;
426
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700427 return err;
428}
429
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700430static int initialize_controller(struct scsi_device *sdev,
Moger, Babu15276662009-09-03 21:42:21 -0600431 struct rdac_dh_data *h, char *array_name)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700432{
433 int err;
434 struct c4_inquiry *inqp;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700435
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700436 err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700437 if (err == SCSI_DH_OK) {
438 inqp = &h->inq.c4;
Moger, Babu15276662009-09-03 21:42:21 -0600439 h->ctlr = get_controller(inqp->subsys_id, inqp->slot_id,
440 array_name);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700441 if (!h->ctlr)
442 err = SCSI_DH_RES_TEMP_UNAVAIL;
443 }
444 return err;
445}
446
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700447static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700448{
449 int err;
450 struct c2_inquiry *inqp;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700451
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700452 err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700453 if (err == SCSI_DH_OK) {
454 inqp = &h->inq.c2;
455 /*
456 * If more than MODE6_MAX_LUN luns are supported, use
457 * mode select 10
458 */
459 if (inqp->max_lun_supported >= MODE6_MAX_LUN)
460 h->ctlr->use_ms10 = 1;
461 else
462 h->ctlr->use_ms10 = 0;
463 }
464 return err;
465}
466
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700467static int mode_select_handle_sense(struct scsi_device *sdev,
468 unsigned char *sensebuf)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700469{
470 struct scsi_sense_hdr sense_hdr;
Chauhan, Vijay7687fb92009-03-04 12:17:54 +0530471 int err = SCSI_DH_IO, ret;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700472
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700473 ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700474 if (!ret)
475 goto done;
476
477 err = SCSI_DH_OK;
Chauhan, Vijay7687fb92009-03-04 12:17:54 +0530478
479 switch (sense_hdr.sense_key) {
480 case NO_SENSE:
481 case ABORTED_COMMAND:
482 case UNIT_ATTENTION:
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700483 err = SCSI_DH_RETRY;
Chauhan, Vijay7687fb92009-03-04 12:17:54 +0530484 break;
485 case NOT_READY:
486 if (sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x01)
487 /* LUN Not Ready and is in the Process of Becoming
488 * Ready
489 */
490 err = SCSI_DH_RETRY;
491 break;
492 case ILLEGAL_REQUEST:
493 if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36)
494 /*
495 * Command Lock contention
496 */
497 err = SCSI_DH_RETRY;
498 break;
499 default:
500 sdev_printk(KERN_INFO, sdev,
501 "MODE_SELECT failed with sense %02x/%02x/%02x.\n",
502 sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700503 }
504
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700505done:
506 return err;
507}
508
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700509static int send_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700510{
511 struct request *rq;
512 struct request_queue *q = sdev->request_queue;
Chandra Seetharamanc85f8cb92008-11-05 20:06:37 -0800513 int err, retry_cnt = RDAC_RETRY_COUNT;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700514
Chandra Seetharamanc85f8cb92008-11-05 20:06:37 -0800515retry:
516 err = SCSI_DH_RES_TEMP_UNAVAIL;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700517 rq = rdac_failover_get(sdev, h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700518 if (!rq)
519 goto done;
520
Chandra Seetharamanc85f8cb92008-11-05 20:06:37 -0800521 sdev_printk(KERN_INFO, sdev, "%s MODE_SELECT command.\n",
522 (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying");
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700523
524 err = blk_execute_rq(q, NULL, rq, 1);
Chandra Seetharamanc85f8cb92008-11-05 20:06:37 -0800525 blk_put_request(rq);
526 if (err != SCSI_DH_OK) {
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700527 err = mode_select_handle_sense(sdev, h->sense);
Chandra Seetharamanc85f8cb92008-11-05 20:06:37 -0800528 if (err == SCSI_DH_RETRY && retry_cnt--)
529 goto retry;
530 }
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700531 if (err == SCSI_DH_OK)
532 h->state = RDAC_STATE_ACTIVE;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700533
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700534done:
535 return err;
536}
537
538static int rdac_activate(struct scsi_device *sdev)
539{
540 struct rdac_dh_data *h = get_rdac_data(sdev);
541 int err = SCSI_DH_OK;
542
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700543 err = check_ownership(sdev, h);
544 if (err != SCSI_DH_OK)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700545 goto done;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700546
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700547 if (h->lun_state == RDAC_LUN_UNOWNED)
548 err = send_mode_select(sdev, h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700549done:
550 return err;
551}
552
553static int rdac_prep_fn(struct scsi_device *sdev, struct request *req)
554{
555 struct rdac_dh_data *h = get_rdac_data(sdev);
556 int ret = BLKPREP_OK;
557
558 if (h->state != RDAC_STATE_ACTIVE) {
559 ret = BLKPREP_KILL;
560 req->cmd_flags |= REQ_QUIET;
561 }
562 return ret;
563
564}
565
566static int rdac_check_sense(struct scsi_device *sdev,
567 struct scsi_sense_hdr *sense_hdr)
568{
569 struct rdac_dh_data *h = get_rdac_data(sdev);
570 switch (sense_hdr->sense_key) {
571 case NOT_READY:
Chauhan, Vijay8f032262009-04-20 18:14:23 +0530572 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
573 /* LUN Not Ready - Logical Unit Not Ready and is in
574 * the process of becoming ready
575 * Just retry.
576 */
577 return ADD_TO_MLQUEUE;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700578 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81)
579 /* LUN Not Ready - Storage firmware incompatible
580 * Manual code synchonisation required.
581 *
582 * Nothing we can do here. Try to bypass the path.
583 */
584 return SUCCESS;
585 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1)
586 /* LUN Not Ready - Quiescense in progress
587 *
588 * Just retry and wait.
589 */
Mike Andersonc7dbb622008-08-12 12:11:57 -0700590 return ADD_TO_MLQUEUE;
Chauhan, Vijayaf50bb92009-03-17 18:51:40 +0530591 if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02)
592 /* LUN Not Ready - Quiescense in progress
593 * or has been achieved
594 * Just retry.
595 */
596 return ADD_TO_MLQUEUE;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700597 break;
598 case ILLEGAL_REQUEST:
599 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) {
600 /* Invalid Request - Current Logical Unit Ownership.
601 * Controller is not the current owner of the LUN,
602 * Fail the path, so that the other path be used.
603 */
604 h->state = RDAC_STATE_PASSIVE;
605 return SUCCESS;
606 }
607 break;
608 case UNIT_ATTENTION:
609 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
610 /*
611 * Power On, Reset, or Bus Device Reset, just retry.
612 */
Mike Andersonc7dbb622008-08-12 12:11:57 -0700613 return ADD_TO_MLQUEUE;
Chauhan, Vijayea41e412009-01-26 21:29:37 +0530614 if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02)
615 /*
616 * Quiescence in progress , just retry.
617 */
618 return ADD_TO_MLQUEUE;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700619 break;
620 }
621 /* success just means we do not care what scsi-ml does */
622 return SCSI_RETURN_NOT_HANDLED;
623}
624
Adrian Bunkf08c0762008-08-11 11:59:21 -0700625static const struct scsi_dh_devlist rdac_dev_list[] = {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700626 {"IBM", "1722"},
627 {"IBM", "1724"},
628 {"IBM", "1726"},
629 {"IBM", "1742"},
630 {"IBM", "1814"},
631 {"IBM", "1815"},
632 {"IBM", "1818"},
633 {"IBM", "3526"},
634 {"SGI", "TP9400"},
635 {"SGI", "TP9500"},
636 {"SGI", "IS"},
637 {"STK", "OPENstorage D280"},
638 {"SUN", "CSM200_R"},
Charlie Brady5bab0882009-08-26 14:16:57 -0400639 {"SUN", "LCSM100_I"},
640 {"SUN", "LCSM100_S"},
641 {"SUN", "LCSM100_E"},
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700642 {"SUN", "LCSM100_F"},
Yanqing_Liu@Dell.com650849d2008-10-02 12:18:33 -0500643 {"DELL", "MD3000"},
644 {"DELL", "MD3000i"},
Yanqing_Liu@Dell.comcdf69bb2009-08-17 14:31:42 -0500645 {"DELL", "MD32xx"},
646 {"DELL", "MD32xxi"},
Babu Moger273c4782008-11-10 16:17:48 -0700647 {"LSI", "INF-01-00"},
648 {"ENGENIO", "INF-01-00"},
Chandra Seetharaman4dbfb542009-08-12 12:43:20 -0700649 {"STK", "FLEXLINE 380"},
650 {"SUN", "CSM100_R_FC"},
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700651 {NULL, NULL},
652};
653
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700654static int rdac_bus_attach(struct scsi_device *sdev);
655static void rdac_bus_detach(struct scsi_device *sdev);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700656
657static struct scsi_device_handler rdac_dh = {
658 .name = RDAC_NAME,
659 .module = THIS_MODULE,
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700660 .devlist = rdac_dev_list,
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700661 .prep_fn = rdac_prep_fn,
662 .check_sense = rdac_check_sense,
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700663 .attach = rdac_bus_attach,
664 .detach = rdac_bus_detach,
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700665 .activate = rdac_activate,
666};
667
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700668static int rdac_bus_attach(struct scsi_device *sdev)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700669{
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700670 struct scsi_dh_data *scsi_dh_data;
671 struct rdac_dh_data *h;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700672 unsigned long flags;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700673 int err;
Moger, Babu15276662009-09-03 21:42:21 -0600674 char array_name[ARRAY_LABEL_LEN];
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700675
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700676 scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
677 + sizeof(*h) , GFP_KERNEL);
678 if (!scsi_dh_data) {
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700679 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700680 RDAC_NAME);
Chandra Seetharaman33af79d2008-07-16 17:35:08 -0700681 return 0;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700682 }
683
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700684 scsi_dh_data->scsi_dh = &rdac_dh;
685 h = (struct rdac_dh_data *) scsi_dh_data->buf;
686 h->lun = UNINITIALIZED_LUN;
687 h->state = RDAC_STATE_ACTIVE;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700688
Moger, Babu15276662009-09-03 21:42:21 -0600689 err = get_lun_info(sdev, h, array_name);
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700690 if (err != SCSI_DH_OK)
691 goto failed;
692
Moger, Babu15276662009-09-03 21:42:21 -0600693 err = initialize_controller(sdev, h, array_name);
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700694 if (err != SCSI_DH_OK)
695 goto failed;
696
Moger, Babu87b79a52009-09-03 21:42:15 -0600697 err = check_ownership(sdev, h);
698 if (err != SCSI_DH_OK)
699 goto clean_ctlr;
700
701 err = set_mode_select(sdev, h);
702 if (err != SCSI_DH_OK)
703 goto clean_ctlr;
704
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700705 if (!try_module_get(THIS_MODULE))
Moger, Babu87b79a52009-09-03 21:42:15 -0600706 goto clean_ctlr;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700707
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700708 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
709 sdev->scsi_dh_data = scsi_dh_data;
710 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700711
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700712 sdev_printk(KERN_NOTICE, sdev,
713 "%s: LUN %d (%s)\n",
714 RDAC_NAME, h->lun, lun_state[(int)h->lun_state]);
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700715
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700716 return 0;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700717
Moger, Babu87b79a52009-09-03 21:42:15 -0600718clean_ctlr:
719 kref_put(&h->ctlr->kref, release_controller);
720
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700721failed:
722 kfree(scsi_dh_data);
723 sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
724 RDAC_NAME);
725 return -EINVAL;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700726}
727
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700728static void rdac_bus_detach( struct scsi_device *sdev )
729{
730 struct scsi_dh_data *scsi_dh_data;
731 struct rdac_dh_data *h;
732 unsigned long flags;
733
734 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
735 scsi_dh_data = sdev->scsi_dh_data;
736 sdev->scsi_dh_data = NULL;
737 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
738
739 h = (struct rdac_dh_data *) scsi_dh_data->buf;
740 if (h->ctlr)
741 kref_put(&h->ctlr->kref, release_controller);
742 kfree(scsi_dh_data);
743 module_put(THIS_MODULE);
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700744 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME);
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700745}
746
747
748
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700749static int __init rdac_init(void)
750{
751 int r;
752
753 r = scsi_register_device_handler(&rdac_dh);
754 if (r != 0)
755 printk(KERN_ERR "Failed to register scsi device handler.");
756 return r;
757}
758
759static void __exit rdac_exit(void)
760{
761 scsi_unregister_device_handler(&rdac_dh);
762}
763
764module_init(rdac_init);
765module_exit(rdac_exit);
766
767MODULE_DESCRIPTION("Multipath LSI/Engenio RDAC driver");
768MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
769MODULE_LICENSE("GPL");