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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"
27
28/*
29 * LSI mode page stuff
30 *
31 * These struct definitions and the forming of the
32 * mode page were taken from the LSI RDAC 2.4 GPL'd
33 * driver, and then converted to Linux conventions.
34 */
35#define RDAC_QUIESCENCE_TIME 20;
36/*
37 * Page Codes
38 */
39#define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c
40
41/*
42 * Controller modes definitions
43 */
44#define RDAC_MODE_TRANSFER_SPECIFIED_LUNS 0x02
45
46/*
47 * RDAC Options field
48 */
49#define RDAC_FORCED_QUIESENCE 0x02
50
51#define RDAC_TIMEOUT (60 * HZ)
52#define RDAC_RETRIES 3
53
54struct rdac_mode_6_hdr {
55 u8 data_len;
56 u8 medium_type;
57 u8 device_params;
58 u8 block_desc_len;
59};
60
61struct rdac_mode_10_hdr {
62 u16 data_len;
63 u8 medium_type;
64 u8 device_params;
65 u16 reserved;
66 u16 block_desc_len;
67};
68
69struct rdac_mode_common {
70 u8 controller_serial[16];
71 u8 alt_controller_serial[16];
72 u8 rdac_mode[2];
73 u8 alt_rdac_mode[2];
74 u8 quiescence_timeout;
75 u8 rdac_options;
76};
77
78struct rdac_pg_legacy {
79 struct rdac_mode_6_hdr hdr;
80 u8 page_code;
81 u8 page_len;
82 struct rdac_mode_common common;
83#define MODE6_MAX_LUN 32
84 u8 lun_table[MODE6_MAX_LUN];
85 u8 reserved2[32];
86 u8 reserved3;
87 u8 reserved4;
88};
89
90struct rdac_pg_expanded {
91 struct rdac_mode_10_hdr hdr;
92 u8 page_code;
93 u8 subpage_code;
94 u8 page_len[2];
95 struct rdac_mode_common common;
96 u8 lun_table[256];
97 u8 reserved3;
98 u8 reserved4;
99};
100
101struct c9_inquiry {
102 u8 peripheral_info;
103 u8 page_code; /* 0xC9 */
104 u8 reserved1;
105 u8 page_len;
106 u8 page_id[4]; /* "vace" */
107 u8 avte_cvp;
108 u8 path_prio;
109 u8 reserved2[38];
110};
111
112#define SUBSYS_ID_LEN 16
113#define SLOT_ID_LEN 2
114
115struct c4_inquiry {
116 u8 peripheral_info;
117 u8 page_code; /* 0xC4 */
118 u8 reserved1;
119 u8 page_len;
120 u8 page_id[4]; /* "subs" */
121 u8 subsys_id[SUBSYS_ID_LEN];
122 u8 revision[4];
123 u8 slot_id[SLOT_ID_LEN];
124 u8 reserved[2];
125};
126
127struct rdac_controller {
128 u8 subsys_id[SUBSYS_ID_LEN];
129 u8 slot_id[SLOT_ID_LEN];
130 int use_ms10;
131 struct kref kref;
132 struct list_head node; /* list of all controllers */
133 union {
134 struct rdac_pg_legacy legacy;
135 struct rdac_pg_expanded expanded;
136 } mode_select;
137};
138struct c8_inquiry {
139 u8 peripheral_info;
140 u8 page_code; /* 0xC8 */
141 u8 reserved1;
142 u8 page_len;
143 u8 page_id[4]; /* "edid" */
144 u8 reserved2[3];
145 u8 vol_uniq_id_len;
146 u8 vol_uniq_id[16];
147 u8 vol_user_label_len;
148 u8 vol_user_label[60];
149 u8 array_uniq_id_len;
150 u8 array_unique_id[16];
151 u8 array_user_label_len;
152 u8 array_user_label[60];
153 u8 lun[8];
154};
155
156struct c2_inquiry {
157 u8 peripheral_info;
158 u8 page_code; /* 0xC2 */
159 u8 reserved1;
160 u8 page_len;
161 u8 page_id[4]; /* "swr4" */
162 u8 sw_version[3];
163 u8 sw_date[3];
164 u8 features_enabled;
165 u8 max_lun_supported;
166 u8 partitions[239]; /* Total allocation length should be 0xFF */
167};
168
169struct rdac_dh_data {
170 struct rdac_controller *ctlr;
171#define UNINITIALIZED_LUN (1 << 8)
172 unsigned lun;
173#define RDAC_STATE_ACTIVE 0
174#define RDAC_STATE_PASSIVE 1
175 unsigned char state;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700176
177#define RDAC_LUN_UNOWNED 0
178#define RDAC_LUN_OWNED 1
179#define RDAC_LUN_AVT 2
180 char lun_state;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700181 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
182 union {
183 struct c2_inquiry c2;
184 struct c4_inquiry c4;
185 struct c8_inquiry c8;
186 struct c9_inquiry c9;
187 } inq;
188};
189
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700190static const char *lun_state[] =
191{
192 "unowned",
193 "owned",
194 "owned (AVT mode)",
195};
196
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700197static LIST_HEAD(ctlr_list);
198static DEFINE_SPINLOCK(list_lock);
199
200static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev)
201{
202 struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
203 BUG_ON(scsi_dh_data == NULL);
204 return ((struct rdac_dh_data *) scsi_dh_data->buf);
205}
206
207static struct request *get_rdac_req(struct scsi_device *sdev,
208 void *buffer, unsigned buflen, int rw)
209{
210 struct request *rq;
211 struct request_queue *q = sdev->request_queue;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700212
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700213 rq = blk_get_request(q, rw, GFP_NOIO);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700214
215 if (!rq) {
216 sdev_printk(KERN_INFO, sdev,
217 "get_rdac_req: blk_get_request failed.\n");
218 return NULL;
219 }
220
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700221 if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700222 blk_put_request(rq);
223 sdev_printk(KERN_INFO, sdev,
224 "get_rdac_req: blk_rq_map_kern failed.\n");
225 return NULL;
226 }
227
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700228 rq->cmd_type = REQ_TYPE_BLOCK_PC;
Mike Christie6000a362008-08-19 18:45:30 -0500229 rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
230 REQ_FAILFAST_DRIVER;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700231 rq->retries = RDAC_RETRIES;
232 rq->timeout = RDAC_TIMEOUT;
233
234 return rq;
235}
236
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700237static struct request *rdac_failover_get(struct scsi_device *sdev,
238 struct rdac_dh_data *h)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700239{
240 struct request *rq;
241 struct rdac_mode_common *common;
242 unsigned data_size;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700243
244 if (h->ctlr->use_ms10) {
245 struct rdac_pg_expanded *rdac_pg;
246
247 data_size = sizeof(struct rdac_pg_expanded);
248 rdac_pg = &h->ctlr->mode_select.expanded;
249 memset(rdac_pg, 0, data_size);
250 common = &rdac_pg->common;
251 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40;
252 rdac_pg->subpage_code = 0x1;
253 rdac_pg->page_len[0] = 0x01;
254 rdac_pg->page_len[1] = 0x28;
255 rdac_pg->lun_table[h->lun] = 0x81;
256 } else {
257 struct rdac_pg_legacy *rdac_pg;
258
259 data_size = sizeof(struct rdac_pg_legacy);
260 rdac_pg = &h->ctlr->mode_select.legacy;
261 memset(rdac_pg, 0, data_size);
262 common = &rdac_pg->common;
263 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER;
264 rdac_pg->page_len = 0x68;
265 rdac_pg->lun_table[h->lun] = 0x81;
266 }
267 common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS;
268 common->quiescence_timeout = RDAC_QUIESCENCE_TIME;
269 common->rdac_options = RDAC_FORCED_QUIESENCE;
270
271 /* get request for block layer packet command */
272 rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE);
273 if (!rq)
274 return NULL;
275
276 /* Prepare the command. */
277 if (h->ctlr->use_ms10) {
278 rq->cmd[0] = MODE_SELECT_10;
279 rq->cmd[7] = data_size >> 8;
280 rq->cmd[8] = data_size & 0xff;
281 } else {
282 rq->cmd[0] = MODE_SELECT;
283 rq->cmd[4] = data_size;
284 }
285 rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
286
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700287 rq->sense = h->sense;
288 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
289 rq->sense_len = 0;
290
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700291 return rq;
292}
293
294static void release_controller(struct kref *kref)
295{
296 struct rdac_controller *ctlr;
297 ctlr = container_of(kref, struct rdac_controller, kref);
298
299 spin_lock(&list_lock);
300 list_del(&ctlr->node);
301 spin_unlock(&list_lock);
302 kfree(ctlr);
303}
304
305static struct rdac_controller *get_controller(u8 *subsys_id, u8 *slot_id)
306{
307 struct rdac_controller *ctlr, *tmp;
308
309 spin_lock(&list_lock);
310
311 list_for_each_entry(tmp, &ctlr_list, node) {
312 if ((memcmp(tmp->subsys_id, subsys_id, SUBSYS_ID_LEN) == 0) &&
313 (memcmp(tmp->slot_id, slot_id, SLOT_ID_LEN) == 0)) {
314 kref_get(&tmp->kref);
315 spin_unlock(&list_lock);
316 return tmp;
317 }
318 }
319 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
320 if (!ctlr)
321 goto done;
322
323 /* initialize fields of controller */
324 memcpy(ctlr->subsys_id, subsys_id, SUBSYS_ID_LEN);
325 memcpy(ctlr->slot_id, slot_id, SLOT_ID_LEN);
326 kref_init(&ctlr->kref);
327 ctlr->use_ms10 = -1;
328 list_add(&ctlr->node, &ctlr_list);
329done:
330 spin_unlock(&list_lock);
331 return ctlr;
332}
333
334static int submit_inquiry(struct scsi_device *sdev, int page_code,
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700335 unsigned int len, struct rdac_dh_data *h)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700336{
337 struct request *rq;
338 struct request_queue *q = sdev->request_queue;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700339 int err = SCSI_DH_RES_TEMP_UNAVAIL;
340
341 rq = get_rdac_req(sdev, &h->inq, len, READ);
342 if (!rq)
343 goto done;
344
345 /* Prepare the command. */
346 rq->cmd[0] = INQUIRY;
347 rq->cmd[1] = 1;
348 rq->cmd[2] = page_code;
349 rq->cmd[4] = len;
350 rq->cmd_len = COMMAND_SIZE(INQUIRY);
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700351
352 rq->sense = h->sense;
353 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
354 rq->sense_len = 0;
355
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700356 err = blk_execute_rq(q, NULL, rq, 1);
357 if (err == -EIO)
358 err = SCSI_DH_IO;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700359
360 blk_put_request(rq);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700361done:
362 return err;
363}
364
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700365static int get_lun(struct scsi_device *sdev, struct rdac_dh_data *h)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700366{
367 int err;
368 struct c8_inquiry *inqp;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700369
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700370 err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700371 if (err == SCSI_DH_OK) {
372 inqp = &h->inq.c8;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700373 if (inqp->page_code != 0xc8)
374 return SCSI_DH_NOSYS;
375 if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' ||
376 inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd')
377 return SCSI_DH_NOSYS;
Chandra Seetharaman8479fca2008-08-12 17:26:58 -0700378 h->lun = inqp->lun[7]; /* Uses only the last byte */
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700379 }
380 return err;
381}
382
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700383static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700384{
385 int err;
386 struct c9_inquiry *inqp;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700387
Chandra Seetharamanfe426252008-08-12 17:26:59 -0700388 h->lun_state = RDAC_LUN_UNOWNED;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700389 err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700390 if (err == SCSI_DH_OK) {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700391 inqp = &h->inq.c9;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700392 if ((inqp->avte_cvp >> 7) == 0x1) {
393 /* LUN in AVT mode */
394 sdev_printk(KERN_NOTICE, sdev,
395 "%s: AVT mode detected\n",
396 RDAC_NAME);
397 h->lun_state = RDAC_LUN_AVT;
398 } else if ((inqp->avte_cvp & 0x1) != 0) {
399 /* LUN was owned by the controller */
400 h->lun_state = RDAC_LUN_OWNED;
401 }
402 }
403
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700404 return err;
405}
406
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700407static int initialize_controller(struct scsi_device *sdev,
408 struct rdac_dh_data *h)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700409{
410 int err;
411 struct c4_inquiry *inqp;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700412
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700413 err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700414 if (err == SCSI_DH_OK) {
415 inqp = &h->inq.c4;
416 h->ctlr = get_controller(inqp->subsys_id, inqp->slot_id);
417 if (!h->ctlr)
418 err = SCSI_DH_RES_TEMP_UNAVAIL;
419 }
420 return err;
421}
422
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700423static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700424{
425 int err;
426 struct c2_inquiry *inqp;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700427
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700428 err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700429 if (err == SCSI_DH_OK) {
430 inqp = &h->inq.c2;
431 /*
432 * If more than MODE6_MAX_LUN luns are supported, use
433 * mode select 10
434 */
435 if (inqp->max_lun_supported >= MODE6_MAX_LUN)
436 h->ctlr->use_ms10 = 1;
437 else
438 h->ctlr->use_ms10 = 0;
439 }
440 return err;
441}
442
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700443static int mode_select_handle_sense(struct scsi_device *sdev,
444 unsigned char *sensebuf)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700445{
446 struct scsi_sense_hdr sense_hdr;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700447 int sense, err = SCSI_DH_IO, ret;
448
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700449 ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700450 if (!ret)
451 goto done;
452
453 err = SCSI_DH_OK;
454 sense = (sense_hdr.sense_key << 16) | (sense_hdr.asc << 8) |
455 sense_hdr.ascq;
456 /* If it is retryable failure, submit the c9 inquiry again */
457 if (sense == 0x59136 || sense == 0x68b02 || sense == 0xb8b02 ||
458 sense == 0x62900) {
459 /* 0x59136 - Command lock contention
460 * 0x[6b]8b02 - Quiesense in progress or achieved
461 * 0x62900 - Power On, Reset, or Bus Device Reset
462 */
463 err = SCSI_DH_RETRY;
464 }
465
466 if (sense)
467 sdev_printk(KERN_INFO, sdev,
468 "MODE_SELECT failed with sense 0x%x.\n", sense);
469done:
470 return err;
471}
472
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700473static int send_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700474{
475 struct request *rq;
476 struct request_queue *q = sdev->request_queue;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700477 int err = SCSI_DH_RES_TEMP_UNAVAIL;
478
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700479 rq = rdac_failover_get(sdev, h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700480 if (!rq)
481 goto done;
482
483 sdev_printk(KERN_INFO, sdev, "queueing MODE_SELECT command.\n");
484
485 err = blk_execute_rq(q, NULL, rq, 1);
486 if (err != SCSI_DH_OK)
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700487 err = mode_select_handle_sense(sdev, h->sense);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700488 if (err == SCSI_DH_OK)
489 h->state = RDAC_STATE_ACTIVE;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700490
491 blk_put_request(rq);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700492done:
493 return err;
494}
495
496static int rdac_activate(struct scsi_device *sdev)
497{
498 struct rdac_dh_data *h = get_rdac_data(sdev);
499 int err = SCSI_DH_OK;
500
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700501 err = check_ownership(sdev, h);
502 if (err != SCSI_DH_OK)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700503 goto done;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700504
505 if (!h->ctlr) {
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700506 err = initialize_controller(sdev, h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700507 if (err != SCSI_DH_OK)
508 goto done;
509 }
510
511 if (h->ctlr->use_ms10 == -1) {
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700512 err = set_mode_select(sdev, h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700513 if (err != SCSI_DH_OK)
514 goto done;
515 }
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700516 if (h->lun_state == RDAC_LUN_UNOWNED)
517 err = send_mode_select(sdev, h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700518done:
519 return err;
520}
521
522static int rdac_prep_fn(struct scsi_device *sdev, struct request *req)
523{
524 struct rdac_dh_data *h = get_rdac_data(sdev);
525 int ret = BLKPREP_OK;
526
527 if (h->state != RDAC_STATE_ACTIVE) {
528 ret = BLKPREP_KILL;
529 req->cmd_flags |= REQ_QUIET;
530 }
531 return ret;
532
533}
534
535static int rdac_check_sense(struct scsi_device *sdev,
536 struct scsi_sense_hdr *sense_hdr)
537{
538 struct rdac_dh_data *h = get_rdac_data(sdev);
539 switch (sense_hdr->sense_key) {
540 case NOT_READY:
541 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81)
542 /* LUN Not Ready - Storage firmware incompatible
543 * Manual code synchonisation required.
544 *
545 * Nothing we can do here. Try to bypass the path.
546 */
547 return SUCCESS;
548 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1)
549 /* LUN Not Ready - Quiescense in progress
550 *
551 * Just retry and wait.
552 */
Mike Andersonc7dbb622008-08-12 12:11:57 -0700553 return ADD_TO_MLQUEUE;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700554 break;
555 case ILLEGAL_REQUEST:
556 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) {
557 /* Invalid Request - Current Logical Unit Ownership.
558 * Controller is not the current owner of the LUN,
559 * Fail the path, so that the other path be used.
560 */
561 h->state = RDAC_STATE_PASSIVE;
562 return SUCCESS;
563 }
564 break;
565 case UNIT_ATTENTION:
566 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
567 /*
568 * Power On, Reset, or Bus Device Reset, just retry.
569 */
Mike Andersonc7dbb622008-08-12 12:11:57 -0700570 return ADD_TO_MLQUEUE;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700571 break;
572 }
573 /* success just means we do not care what scsi-ml does */
574 return SCSI_RETURN_NOT_HANDLED;
575}
576
Adrian Bunkf08c0762008-08-11 11:59:21 -0700577static const struct scsi_dh_devlist rdac_dev_list[] = {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700578 {"IBM", "1722"},
579 {"IBM", "1724"},
580 {"IBM", "1726"},
581 {"IBM", "1742"},
582 {"IBM", "1814"},
583 {"IBM", "1815"},
584 {"IBM", "1818"},
585 {"IBM", "3526"},
586 {"SGI", "TP9400"},
587 {"SGI", "TP9500"},
588 {"SGI", "IS"},
589 {"STK", "OPENstorage D280"},
590 {"SUN", "CSM200_R"},
591 {"SUN", "LCSM100_F"},
Yanqing_Liu@Dell.com650849d2008-10-02 12:18:33 -0500592 {"DELL", "MD3000"},
593 {"DELL", "MD3000i"},
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700594 {NULL, NULL},
595};
596
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700597static int rdac_bus_attach(struct scsi_device *sdev);
598static void rdac_bus_detach(struct scsi_device *sdev);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700599
600static struct scsi_device_handler rdac_dh = {
601 .name = RDAC_NAME,
602 .module = THIS_MODULE,
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700603 .devlist = rdac_dev_list,
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700604 .prep_fn = rdac_prep_fn,
605 .check_sense = rdac_check_sense,
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700606 .attach = rdac_bus_attach,
607 .detach = rdac_bus_detach,
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700608 .activate = rdac_activate,
609};
610
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700611static int rdac_bus_attach(struct scsi_device *sdev)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700612{
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700613 struct scsi_dh_data *scsi_dh_data;
614 struct rdac_dh_data *h;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700615 unsigned long flags;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700616 int err;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700617
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700618 scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
619 + sizeof(*h) , GFP_KERNEL);
620 if (!scsi_dh_data) {
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700621 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700622 RDAC_NAME);
Chandra Seetharaman33af79d2008-07-16 17:35:08 -0700623 return 0;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700624 }
625
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700626 scsi_dh_data->scsi_dh = &rdac_dh;
627 h = (struct rdac_dh_data *) scsi_dh_data->buf;
628 h->lun = UNINITIALIZED_LUN;
629 h->state = RDAC_STATE_ACTIVE;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700630
631 err = get_lun(sdev, h);
632 if (err != SCSI_DH_OK)
633 goto failed;
634
635 err = check_ownership(sdev, h);
636 if (err != SCSI_DH_OK)
637 goto failed;
638
639 if (!try_module_get(THIS_MODULE))
640 goto failed;
641
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700642 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
643 sdev->scsi_dh_data = scsi_dh_data;
644 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700645
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700646 sdev_printk(KERN_NOTICE, sdev,
647 "%s: LUN %d (%s)\n",
648 RDAC_NAME, h->lun, lun_state[(int)h->lun_state]);
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700649
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700650 return 0;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700651
652failed:
653 kfree(scsi_dh_data);
654 sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
655 RDAC_NAME);
656 return -EINVAL;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700657}
658
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700659static void rdac_bus_detach( struct scsi_device *sdev )
660{
661 struct scsi_dh_data *scsi_dh_data;
662 struct rdac_dh_data *h;
663 unsigned long flags;
664
665 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
666 scsi_dh_data = sdev->scsi_dh_data;
667 sdev->scsi_dh_data = NULL;
668 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
669
670 h = (struct rdac_dh_data *) scsi_dh_data->buf;
671 if (h->ctlr)
672 kref_put(&h->ctlr->kref, release_controller);
673 kfree(scsi_dh_data);
674 module_put(THIS_MODULE);
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700675 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME);
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700676}
677
678
679
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700680static int __init rdac_init(void)
681{
682 int r;
683
684 r = scsi_register_device_handler(&rdac_dh);
685 if (r != 0)
686 printk(KERN_ERR "Failed to register scsi device handler.");
687 return r;
688}
689
690static void __exit rdac_exit(void)
691{
692 scsi_unregister_device_handler(&rdac_dh);
693}
694
695module_init(rdac_init);
696module_exit(rdac_exit);
697
698MODULE_DESCRIPTION("Multipath LSI/Engenio RDAC driver");
699MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
700MODULE_LICENSE("GPL");