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Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -07001/*
Chauhan, Vijay5f7a6432011-09-02 13:26:32 +05302 * LSI/Engenio/NetApp E-Series RDAC SCSI Device Handler
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -07003 *
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>
Chandra Seetharaman970f3f42009-10-21 09:22:51 -070025#include <linux/workqueue.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090026#include <linux/slab.h>
Paul Gortmakeracf3368f2011-05-27 09:47:43 -040027#include <linux/module.h>
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -070028
29#define RDAC_NAME "rdac"
Chandra Seetharamanc85f8cb92008-11-05 20:06:37 -080030#define RDAC_RETRY_COUNT 5
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -070031
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 */
Phil Carmody497888c2011-07-14 15:07:13 +030039#define RDAC_QUIESCENCE_TIME 20
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -070040/*
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
58struct rdac_mode_6_hdr {
59 u8 data_len;
60 u8 medium_type;
61 u8 device_params;
62 u8 block_desc_len;
63};
64
65struct 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
73struct 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
82struct 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
94struct 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
105struct 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
Moger, Babu15276662009-09-03 21:42:21 -0600118#define ARRAY_LABEL_LEN 31
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700119
120struct 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
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700132#define UNIQUE_ID_LEN 16
133struct 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
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700151struct rdac_controller {
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700152 u8 array_id[UNIQUE_ID_LEN];
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700153 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;
Moger, Babu15276662009-09-03 21:42:21 -0600160 u8 index;
161 u8 array_name[ARRAY_LABEL_LEN];
Chandra Seetharamand6857592011-07-27 11:22:56 -0700162 struct Scsi_Host *host;
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700163 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;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700168};
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700169
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700170struct c2_inquiry {
171 u8 peripheral_info;
172 u8 page_code; /* 0xC2 */
173 u8 reserved1;
174 u8 page_len;
175 u8 page_id[4]; /* "swr4" */
176 u8 sw_version[3];
177 u8 sw_date[3];
178 u8 features_enabled;
179 u8 max_lun_supported;
180 u8 partitions[239]; /* Total allocation length should be 0xFF */
181};
182
183struct rdac_dh_data {
184 struct rdac_controller *ctlr;
185#define UNINITIALIZED_LUN (1 << 8)
186 unsigned lun;
Moger, Babueebe9b92011-04-08 11:37:40 -0600187
188#define RDAC_MODE 0
189#define RDAC_MODE_AVT 1
190#define RDAC_MODE_IOSHIP 2
191 unsigned char mode;
192
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700193#define RDAC_STATE_ACTIVE 0
194#define RDAC_STATE_PASSIVE 1
195 unsigned char state;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700196
197#define RDAC_LUN_UNOWNED 0
198#define RDAC_LUN_OWNED 1
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700199 char lun_state;
Moger, Babueebe9b92011-04-08 11:37:40 -0600200
201#define RDAC_PREFERRED 0
202#define RDAC_NON_PREFERRED 1
203 char preferred;
204
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700205 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
206 union {
207 struct c2_inquiry c2;
208 struct c4_inquiry c4;
209 struct c8_inquiry c8;
210 struct c9_inquiry c9;
211 } inq;
212};
213
Moger, Babueebe9b92011-04-08 11:37:40 -0600214static const char *mode[] = {
215 "RDAC",
216 "AVT",
217 "IOSHIP",
218};
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700219static const char *lun_state[] =
220{
221 "unowned",
222 "owned",
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700223};
224
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700225struct rdac_queue_data {
226 struct list_head entry;
227 struct rdac_dh_data *h;
228 activate_complete callback_fn;
229 void *callback_data;
230};
231
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700232static LIST_HEAD(ctlr_list);
233static DEFINE_SPINLOCK(list_lock);
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700234static struct workqueue_struct *kmpath_rdacd;
235static void send_mode_select(struct work_struct *work);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700236
Moger, Babudd784ed2009-09-03 21:42:28 -0600237/*
238 * module parameter to enable rdac debug logging.
239 * 2 bits for each type of logging, only two types defined for now
240 * Can be enhanced if required at later point
241 */
242static int rdac_logging = 1;
243module_param(rdac_logging, int, S_IRUGO|S_IWUSR);
244MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, "
245 "Default is 1 - failover logging enabled, "
246 "set it to 0xF to enable all the logs");
247
248#define RDAC_LOG_FAILOVER 0
249#define RDAC_LOG_SENSE 2
250
251#define RDAC_LOG_BITS 2
252
253#define RDAC_LOG_LEVEL(SHIFT) \
254 ((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1))
255
256#define RDAC_LOG(SHIFT, sdev, f, arg...) \
257do { \
258 if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \
259 sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \
260} while (0);
261
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700262static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev)
263{
264 struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
265 BUG_ON(scsi_dh_data == NULL);
266 return ((struct rdac_dh_data *) scsi_dh_data->buf);
267}
268
269static struct request *get_rdac_req(struct scsi_device *sdev,
270 void *buffer, unsigned buflen, int rw)
271{
272 struct request *rq;
273 struct request_queue *q = sdev->request_queue;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700274
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700275 rq = blk_get_request(q, rw, GFP_NOIO);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700276
277 if (!rq) {
278 sdev_printk(KERN_INFO, sdev,
279 "get_rdac_req: blk_get_request failed.\n");
280 return NULL;
281 }
282
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700283 if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700284 blk_put_request(rq);
285 sdev_printk(KERN_INFO, sdev,
286 "get_rdac_req: blk_rq_map_kern failed.\n");
287 return NULL;
288 }
289
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700290 rq->cmd_type = REQ_TYPE_BLOCK_PC;
Mike Christie6000a362008-08-19 18:45:30 -0500291 rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
292 REQ_FAILFAST_DRIVER;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700293 rq->retries = RDAC_RETRIES;
294 rq->timeout = RDAC_TIMEOUT;
295
296 return rq;
297}
298
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700299static struct request *rdac_failover_get(struct scsi_device *sdev,
Moger, Babu04b6e152011-02-11 15:14:08 -0700300 struct rdac_dh_data *h, struct list_head *list)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700301{
302 struct request *rq;
303 struct rdac_mode_common *common;
304 unsigned data_size;
Moger, Babu04b6e152011-02-11 15:14:08 -0700305 struct rdac_queue_data *qdata;
306 u8 *lun_table;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700307
308 if (h->ctlr->use_ms10) {
309 struct rdac_pg_expanded *rdac_pg;
310
311 data_size = sizeof(struct rdac_pg_expanded);
312 rdac_pg = &h->ctlr->mode_select.expanded;
313 memset(rdac_pg, 0, data_size);
314 common = &rdac_pg->common;
315 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40;
316 rdac_pg->subpage_code = 0x1;
317 rdac_pg->page_len[0] = 0x01;
318 rdac_pg->page_len[1] = 0x28;
Moger, Babu04b6e152011-02-11 15:14:08 -0700319 lun_table = rdac_pg->lun_table;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700320 } else {
321 struct rdac_pg_legacy *rdac_pg;
322
323 data_size = sizeof(struct rdac_pg_legacy);
324 rdac_pg = &h->ctlr->mode_select.legacy;
325 memset(rdac_pg, 0, data_size);
326 common = &rdac_pg->common;
327 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER;
328 rdac_pg->page_len = 0x68;
Moger, Babu04b6e152011-02-11 15:14:08 -0700329 lun_table = rdac_pg->lun_table;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700330 }
331 common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS;
332 common->quiescence_timeout = RDAC_QUIESCENCE_TIME;
333 common->rdac_options = RDAC_FORCED_QUIESENCE;
334
Moger, Babu04b6e152011-02-11 15:14:08 -0700335 list_for_each_entry(qdata, list, entry) {
336 lun_table[qdata->h->lun] = 0x81;
337 }
338
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700339 /* get request for block layer packet command */
340 rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE);
341 if (!rq)
342 return NULL;
343
344 /* Prepare the command. */
345 if (h->ctlr->use_ms10) {
346 rq->cmd[0] = MODE_SELECT_10;
347 rq->cmd[7] = data_size >> 8;
348 rq->cmd[8] = data_size & 0xff;
349 } else {
350 rq->cmd[0] = MODE_SELECT;
351 rq->cmd[4] = data_size;
352 }
353 rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
354
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700355 rq->sense = h->sense;
356 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
357 rq->sense_len = 0;
358
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700359 return rq;
360}
361
362static void release_controller(struct kref *kref)
363{
364 struct rdac_controller *ctlr;
365 ctlr = container_of(kref, struct rdac_controller, kref);
366
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700367 list_del(&ctlr->node);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700368 kfree(ctlr);
369}
370
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700371static struct rdac_controller *get_controller(int index, char *array_name,
Chandra Seetharamand6857592011-07-27 11:22:56 -0700372 u8 *array_id, struct scsi_device *sdev)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700373{
374 struct rdac_controller *ctlr, *tmp;
375
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700376 list_for_each_entry(tmp, &ctlr_list, node) {
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700377 if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) &&
Chandra Seetharamand6857592011-07-27 11:22:56 -0700378 (tmp->index == index) &&
379 (tmp->host == sdev->host)) {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700380 kref_get(&tmp->kref);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700381 return tmp;
382 }
383 }
384 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
385 if (!ctlr)
Moger, Babu3569e532012-02-02 15:21:54 +0000386 return NULL;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700387
388 /* initialize fields of controller */
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700389 memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN);
390 ctlr->index = index;
Chandra Seetharamand6857592011-07-27 11:22:56 -0700391 ctlr->host = sdev->host;
Moger, Babu15276662009-09-03 21:42:21 -0600392 memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN);
393
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700394 kref_init(&ctlr->kref);
395 ctlr->use_ms10 = -1;
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700396 ctlr->ms_queued = 0;
397 ctlr->ms_sdev = NULL;
398 spin_lock_init(&ctlr->ms_lock);
399 INIT_WORK(&ctlr->ms_work, send_mode_select);
400 INIT_LIST_HEAD(&ctlr->ms_head);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700401 list_add(&ctlr->node, &ctlr_list);
Moger, Babu3569e532012-02-02 15:21:54 +0000402
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700403 return ctlr;
404}
405
406static int submit_inquiry(struct scsi_device *sdev, int page_code,
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700407 unsigned int len, struct rdac_dh_data *h)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700408{
409 struct request *rq;
410 struct request_queue *q = sdev->request_queue;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700411 int err = SCSI_DH_RES_TEMP_UNAVAIL;
412
413 rq = get_rdac_req(sdev, &h->inq, len, READ);
414 if (!rq)
415 goto done;
416
417 /* Prepare the command. */
418 rq->cmd[0] = INQUIRY;
419 rq->cmd[1] = 1;
420 rq->cmd[2] = page_code;
421 rq->cmd[4] = len;
422 rq->cmd_len = COMMAND_SIZE(INQUIRY);
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700423
424 rq->sense = h->sense;
425 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
426 rq->sense_len = 0;
427
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700428 err = blk_execute_rq(q, NULL, rq, 1);
429 if (err == -EIO)
430 err = SCSI_DH_IO;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700431
432 blk_put_request(rq);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700433done:
434 return err;
435}
436
Moger, Babu15276662009-09-03 21:42:21 -0600437static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h,
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700438 char *array_name, u8 *array_id)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700439{
Moger, Babu15276662009-09-03 21:42:21 -0600440 int err, i;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700441 struct c8_inquiry *inqp;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700442
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700443 err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700444 if (err == SCSI_DH_OK) {
445 inqp = &h->inq.c8;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700446 if (inqp->page_code != 0xc8)
447 return SCSI_DH_NOSYS;
448 if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' ||
449 inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd')
450 return SCSI_DH_NOSYS;
Chandra Seetharaman8479fca2008-08-12 17:26:58 -0700451 h->lun = inqp->lun[7]; /* Uses only the last byte */
Moger, Babu15276662009-09-03 21:42:21 -0600452
453 for(i=0; i<ARRAY_LABEL_LEN-1; ++i)
454 *(array_name+i) = inqp->array_user_label[(2*i)+1];
455
456 *(array_name+ARRAY_LABEL_LEN-1) = '\0';
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700457 memset(array_id, 0, UNIQUE_ID_LEN);
458 memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700459 }
460 return err;
461}
462
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700463static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700464{
465 int err;
466 struct c9_inquiry *inqp;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700467
Chandra Seetharaman9eece962008-11-05 20:05:21 -0800468 h->state = RDAC_STATE_ACTIVE;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700469 err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700470 if (err == SCSI_DH_OK) {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700471 inqp = &h->inq.c9;
Moger, Babu1c3afc42011-04-08 11:38:33 -0600472 /* detect the operating mode */
473 if ((inqp->avte_cvp >> 5) & 0x1)
474 h->mode = RDAC_MODE_IOSHIP; /* LUN in IOSHIP mode */
475 else if (inqp->avte_cvp >> 7)
476 h->mode = RDAC_MODE_AVT; /* LUN in AVT mode */
477 else
478 h->mode = RDAC_MODE; /* LUN in RDAC mode */
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700479
Moger, Babu1c3afc42011-04-08 11:38:33 -0600480 /* Update ownership */
481 if (inqp->avte_cvp & 0x1)
482 h->lun_state = RDAC_LUN_OWNED;
483 else {
484 h->lun_state = RDAC_LUN_UNOWNED;
485 if (h->mode == RDAC_MODE)
486 h->state = RDAC_STATE_PASSIVE;
487 }
488
489 /* Update path prio*/
490 if (inqp->path_prio & 0x1)
491 h->preferred = RDAC_PREFERRED;
492 else
493 h->preferred = RDAC_NON_PREFERRED;
494 }
Chandra Seetharaman5a367562008-08-21 23:12:40 -0700495
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700496 return err;
497}
498
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700499static int initialize_controller(struct scsi_device *sdev,
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700500 struct rdac_dh_data *h, char *array_name, u8 *array_id)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700501{
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700502 int err, index;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700503 struct c4_inquiry *inqp;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700504
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700505 err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700506 if (err == SCSI_DH_OK) {
507 inqp = &h->inq.c4;
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700508 /* get the controller index */
509 if (inqp->slot_id[1] == 0x31)
510 index = 0;
511 else
512 index = 1;
Moger, Babu3569e532012-02-02 15:21:54 +0000513
514 spin_lock(&list_lock);
Chandra Seetharamand6857592011-07-27 11:22:56 -0700515 h->ctlr = get_controller(index, array_name, array_id, sdev);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700516 if (!h->ctlr)
517 err = SCSI_DH_RES_TEMP_UNAVAIL;
Moger, Babu3569e532012-02-02 15:21:54 +0000518 spin_unlock(&list_lock);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700519 }
520 return err;
521}
522
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700523static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700524{
525 int err;
526 struct c2_inquiry *inqp;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700527
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700528 err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700529 if (err == SCSI_DH_OK) {
530 inqp = &h->inq.c2;
531 /*
532 * If more than MODE6_MAX_LUN luns are supported, use
533 * mode select 10
534 */
535 if (inqp->max_lun_supported >= MODE6_MAX_LUN)
536 h->ctlr->use_ms10 = 1;
537 else
538 h->ctlr->use_ms10 = 0;
539 }
540 return err;
541}
542
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700543static int mode_select_handle_sense(struct scsi_device *sdev,
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700544 unsigned char *sensebuf)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700545{
546 struct scsi_sense_hdr sense_hdr;
Chauhan, Vijay7687fb92009-03-04 12:17:54 +0530547 int err = SCSI_DH_IO, ret;
Moger, Babudd784ed2009-09-03 21:42:28 -0600548 struct rdac_dh_data *h = get_rdac_data(sdev);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700549
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700550 ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700551 if (!ret)
552 goto done;
553
Chauhan, Vijay7687fb92009-03-04 12:17:54 +0530554 switch (sense_hdr.sense_key) {
555 case NO_SENSE:
556 case ABORTED_COMMAND:
557 case UNIT_ATTENTION:
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700558 err = SCSI_DH_RETRY;
Chauhan, Vijay7687fb92009-03-04 12:17:54 +0530559 break;
560 case NOT_READY:
561 if (sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x01)
562 /* LUN Not Ready and is in the Process of Becoming
563 * Ready
564 */
565 err = SCSI_DH_RETRY;
566 break;
567 case ILLEGAL_REQUEST:
568 if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36)
569 /*
570 * Command Lock contention
571 */
572 err = SCSI_DH_RETRY;
573 break;
574 default:
Moger, Babudd784ed2009-09-03 21:42:28 -0600575 break;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700576 }
577
Moger, Babudd784ed2009-09-03 21:42:28 -0600578 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
579 "MODE_SELECT returned with sense %02x/%02x/%02x",
580 (char *) h->ctlr->array_name, h->ctlr->index,
581 sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq);
582
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700583done:
584 return err;
585}
586
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700587static void send_mode_select(struct work_struct *work)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700588{
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700589 struct rdac_controller *ctlr =
590 container_of(work, struct rdac_controller, ms_work);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700591 struct request *rq;
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700592 struct scsi_device *sdev = ctlr->ms_sdev;
593 struct rdac_dh_data *h = get_rdac_data(sdev);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700594 struct request_queue *q = sdev->request_queue;
Chandra Seetharamanc85f8cb92008-11-05 20:06:37 -0800595 int err, retry_cnt = RDAC_RETRY_COUNT;
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700596 struct rdac_queue_data *tmp, *qdata;
597 LIST_HEAD(list);
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700598
599 spin_lock(&ctlr->ms_lock);
600 list_splice_init(&ctlr->ms_head, &list);
601 ctlr->ms_queued = 0;
602 ctlr->ms_sdev = NULL;
603 spin_unlock(&ctlr->ms_lock);
604
Chandra Seetharamanc85f8cb92008-11-05 20:06:37 -0800605retry:
606 err = SCSI_DH_RES_TEMP_UNAVAIL;
Moger, Babu04b6e152011-02-11 15:14:08 -0700607 rq = rdac_failover_get(sdev, h, &list);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700608 if (!rq)
609 goto done;
610
Moger, Babudd784ed2009-09-03 21:42:28 -0600611 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
612 "%s MODE_SELECT command",
613 (char *) h->ctlr->array_name, h->ctlr->index,
Chandra Seetharamanc85f8cb92008-11-05 20:06:37 -0800614 (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying");
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700615
616 err = blk_execute_rq(q, NULL, rq, 1);
Chandra Seetharamanc85f8cb92008-11-05 20:06:37 -0800617 blk_put_request(rq);
618 if (err != SCSI_DH_OK) {
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700619 err = mode_select_handle_sense(sdev, h->sense);
Chandra Seetharamanc85f8cb92008-11-05 20:06:37 -0800620 if (err == SCSI_DH_RETRY && retry_cnt--)
621 goto retry;
622 }
Moger, Babudd784ed2009-09-03 21:42:28 -0600623 if (err == SCSI_DH_OK) {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700624 h->state = RDAC_STATE_ACTIVE;
Moger, Babudd784ed2009-09-03 21:42:28 -0600625 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
626 "MODE_SELECT completed",
627 (char *) h->ctlr->array_name, h->ctlr->index);
628 }
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700629
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700630done:
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700631 list_for_each_entry_safe(qdata, tmp, &list, entry) {
632 list_del(&qdata->entry);
633 if (err == SCSI_DH_OK)
634 qdata->h->state = RDAC_STATE_ACTIVE;
635 if (qdata->callback_fn)
636 qdata->callback_fn(qdata->callback_data, err);
637 kfree(qdata);
638 }
639 return;
640}
641
642static int queue_mode_select(struct scsi_device *sdev,
643 activate_complete fn, void *data)
644{
645 struct rdac_queue_data *qdata;
646 struct rdac_controller *ctlr;
647
648 qdata = kzalloc(sizeof(*qdata), GFP_KERNEL);
649 if (!qdata)
650 return SCSI_DH_RETRY;
651
652 qdata->h = get_rdac_data(sdev);
653 qdata->callback_fn = fn;
654 qdata->callback_data = data;
655
656 ctlr = qdata->h->ctlr;
657 spin_lock(&ctlr->ms_lock);
658 list_add_tail(&qdata->entry, &ctlr->ms_head);
659 if (!ctlr->ms_queued) {
660 ctlr->ms_queued = 1;
661 ctlr->ms_sdev = sdev;
662 queue_work(kmpath_rdacd, &ctlr->ms_work);
663 }
664 spin_unlock(&ctlr->ms_lock);
665 return SCSI_DH_OK;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700666}
667
Chandra Seetharaman3ae31f62009-10-21 09:22:46 -0700668static int rdac_activate(struct scsi_device *sdev,
669 activate_complete fn, void *data)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700670{
671 struct rdac_dh_data *h = get_rdac_data(sdev);
672 int err = SCSI_DH_OK;
Moger, Babu3425fbf2011-04-08 11:39:30 -0600673 int act = 0;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700674
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700675 err = check_ownership(sdev, h);
676 if (err != SCSI_DH_OK)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700677 goto done;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700678
Moger, Babu3425fbf2011-04-08 11:39:30 -0600679 switch (h->mode) {
680 case RDAC_MODE:
681 if (h->lun_state == RDAC_LUN_UNOWNED)
682 act = 1;
683 break;
684 case RDAC_MODE_IOSHIP:
685 if ((h->lun_state == RDAC_LUN_UNOWNED) &&
686 (h->preferred == RDAC_PREFERRED))
687 act = 1;
688 break;
689 default:
690 break;
691 }
692
693 if (act) {
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700694 err = queue_mode_select(sdev, fn, data);
695 if (err == SCSI_DH_OK)
696 return 0;
697 }
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700698done:
Chandra Seetharaman3ae31f62009-10-21 09:22:46 -0700699 if (fn)
700 fn(data, err);
701 return 0;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700702}
703
704static int rdac_prep_fn(struct scsi_device *sdev, struct request *req)
705{
706 struct rdac_dh_data *h = get_rdac_data(sdev);
707 int ret = BLKPREP_OK;
708
709 if (h->state != RDAC_STATE_ACTIVE) {
710 ret = BLKPREP_KILL;
711 req->cmd_flags |= REQ_QUIET;
712 }
713 return ret;
714
715}
716
717static int rdac_check_sense(struct scsi_device *sdev,
718 struct scsi_sense_hdr *sense_hdr)
719{
720 struct rdac_dh_data *h = get_rdac_data(sdev);
Moger, Babudd784ed2009-09-03 21:42:28 -0600721
722 RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, "
723 "I/O returned with sense %02x/%02x/%02x",
724 (char *) h->ctlr->array_name, h->ctlr->index,
725 sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
726
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700727 switch (sense_hdr->sense_key) {
728 case NOT_READY:
Chauhan, Vijay8f032262009-04-20 18:14:23 +0530729 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
730 /* LUN Not Ready - Logical Unit Not Ready and is in
731 * the process of becoming ready
732 * Just retry.
733 */
734 return ADD_TO_MLQUEUE;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700735 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81)
736 /* LUN Not Ready - Storage firmware incompatible
737 * Manual code synchonisation required.
738 *
739 * Nothing we can do here. Try to bypass the path.
740 */
741 return SUCCESS;
742 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1)
743 /* LUN Not Ready - Quiescense in progress
744 *
745 * Just retry and wait.
746 */
Mike Andersonc7dbb622008-08-12 12:11:57 -0700747 return ADD_TO_MLQUEUE;
Chauhan, Vijayaf50bb92009-03-17 18:51:40 +0530748 if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02)
749 /* LUN Not Ready - Quiescense in progress
750 * or has been achieved
751 * Just retry.
752 */
753 return ADD_TO_MLQUEUE;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700754 break;
755 case ILLEGAL_REQUEST:
756 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) {
757 /* Invalid Request - Current Logical Unit Ownership.
758 * Controller is not the current owner of the LUN,
759 * Fail the path, so that the other path be used.
760 */
761 h->state = RDAC_STATE_PASSIVE;
762 return SUCCESS;
763 }
764 break;
765 case UNIT_ATTENTION:
766 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
767 /*
768 * Power On, Reset, or Bus Device Reset, just retry.
769 */
Mike Andersonc7dbb622008-08-12 12:11:57 -0700770 return ADD_TO_MLQUEUE;
Chauhan, Vijayea41e412009-01-26 21:29:37 +0530771 if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02)
772 /*
773 * Quiescence in progress , just retry.
774 */
775 return ADD_TO_MLQUEUE;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700776 break;
777 }
778 /* success just means we do not care what scsi-ml does */
779 return SCSI_RETURN_NOT_HANDLED;
780}
781
Adrian Bunkf08c0762008-08-11 11:59:21 -0700782static const struct scsi_dh_devlist rdac_dev_list[] = {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700783 {"IBM", "1722"},
784 {"IBM", "1724"},
785 {"IBM", "1726"},
786 {"IBM", "1742"},
Moger, Babu6f4fdda2009-11-04 12:36:16 -0700787 {"IBM", "1745"},
788 {"IBM", "1746"},
Stewart, Sean4df01b02013-09-11 22:54:07 +0000789 {"IBM", "1813"},
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700790 {"IBM", "1814"},
791 {"IBM", "1815"},
792 {"IBM", "1818"},
793 {"IBM", "3526"},
Moger, Babu35204772012-09-04 17:05:15 +0000794 {"SGI", "TP9"},
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700795 {"SGI", "IS"},
796 {"STK", "OPENstorage D280"},
Moger, Babue7ba29d2012-09-04 17:04:33 +0000797 {"STK", "FLEXLINE 380"},
Moger, Babu35204772012-09-04 17:05:15 +0000798 {"SUN", "CSM"},
799 {"SUN", "LCSM100"},
Moger, Babue7ba29d2012-09-04 17:04:33 +0000800 {"SUN", "STK6580_6780"},
801 {"SUN", "SUN_6180"},
802 {"SUN", "ArrayStorage"},
Moger, Babu35204772012-09-04 17:05:15 +0000803 {"DELL", "MD3"},
Moger, Babue7ba29d2012-09-04 17:04:33 +0000804 {"NETAPP", "INF-01-00"},
Babu Moger273c4782008-11-10 16:17:48 -0700805 {"LSI", "INF-01-00"},
806 {"ENGENIO", "INF-01-00"},
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700807 {NULL, NULL},
808};
809
Moger, Babubee89ea2011-12-01 15:01:40 -0500810static bool rdac_match(struct scsi_device *sdev)
811{
812 int i;
813
814 if (scsi_device_tpgs(sdev))
815 return false;
816
817 for (i = 0; rdac_dev_list[i].vendor; i++) {
818 if (!strncmp(sdev->vendor, rdac_dev_list[i].vendor,
819 strlen(rdac_dev_list[i].vendor)) &&
820 !strncmp(sdev->model, rdac_dev_list[i].model,
821 strlen(rdac_dev_list[i].model))) {
822 return true;
823 }
824 }
825 return false;
826}
827
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700828static int rdac_bus_attach(struct scsi_device *sdev);
829static void rdac_bus_detach(struct scsi_device *sdev);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700830
831static struct scsi_device_handler rdac_dh = {
832 .name = RDAC_NAME,
833 .module = THIS_MODULE,
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700834 .devlist = rdac_dev_list,
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700835 .prep_fn = rdac_prep_fn,
836 .check_sense = rdac_check_sense,
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700837 .attach = rdac_bus_attach,
838 .detach = rdac_bus_detach,
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700839 .activate = rdac_activate,
Moger, Babubee89ea2011-12-01 15:01:40 -0500840 .match = rdac_match,
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700841};
842
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700843static int rdac_bus_attach(struct scsi_device *sdev)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700844{
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700845 struct scsi_dh_data *scsi_dh_data;
846 struct rdac_dh_data *h;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700847 unsigned long flags;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700848 int err;
Moger, Babu15276662009-09-03 21:42:21 -0600849 char array_name[ARRAY_LABEL_LEN];
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700850 char array_id[UNIQUE_ID_LEN];
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700851
Hillf Danton9dfeb312011-02-11 15:17:33 -0700852 scsi_dh_data = kzalloc(sizeof(*scsi_dh_data)
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700853 + sizeof(*h) , GFP_KERNEL);
854 if (!scsi_dh_data) {
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700855 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700856 RDAC_NAME);
Moger, Babu1315da32012-09-04 17:13:18 +0000857 return -ENOMEM;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700858 }
859
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700860 scsi_dh_data->scsi_dh = &rdac_dh;
861 h = (struct rdac_dh_data *) scsi_dh_data->buf;
862 h->lun = UNINITIALIZED_LUN;
863 h->state = RDAC_STATE_ACTIVE;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700864
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700865 err = get_lun_info(sdev, h, array_name, array_id);
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700866 if (err != SCSI_DH_OK)
867 goto failed;
868
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700869 err = initialize_controller(sdev, h, array_name, array_id);
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700870 if (err != SCSI_DH_OK)
871 goto failed;
872
Moger, Babu87b79a52009-09-03 21:42:15 -0600873 err = check_ownership(sdev, h);
874 if (err != SCSI_DH_OK)
875 goto clean_ctlr;
876
877 err = set_mode_select(sdev, h);
878 if (err != SCSI_DH_OK)
879 goto clean_ctlr;
880
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700881 if (!try_module_get(THIS_MODULE))
Moger, Babu87b79a52009-09-03 21:42:15 -0600882 goto clean_ctlr;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700883
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700884 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
885 sdev->scsi_dh_data = scsi_dh_data;
886 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700887
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700888 sdev_printk(KERN_NOTICE, sdev,
Moger, Babueebe9b92011-04-08 11:37:40 -0600889 "%s: LUN %d (%s) (%s)\n",
890 RDAC_NAME, h->lun, mode[(int)h->mode],
891 lun_state[(int)h->lun_state]);
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700892
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700893 return 0;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700894
Moger, Babu87b79a52009-09-03 21:42:15 -0600895clean_ctlr:
Moger, Babu3569e532012-02-02 15:21:54 +0000896 spin_lock(&list_lock);
Moger, Babu87b79a52009-09-03 21:42:15 -0600897 kref_put(&h->ctlr->kref, release_controller);
Moger, Babu3569e532012-02-02 15:21:54 +0000898 spin_unlock(&list_lock);
Moger, Babu87b79a52009-09-03 21:42:15 -0600899
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700900failed:
901 kfree(scsi_dh_data);
902 sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
903 RDAC_NAME);
904 return -EINVAL;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700905}
906
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700907static void rdac_bus_detach( struct scsi_device *sdev )
908{
909 struct scsi_dh_data *scsi_dh_data;
910 struct rdac_dh_data *h;
911 unsigned long flags;
912
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700913 scsi_dh_data = sdev->scsi_dh_data;
Moger, Babu3569e532012-02-02 15:21:54 +0000914 h = (struct rdac_dh_data *) scsi_dh_data->buf;
915 if (h->ctlr && h->ctlr->ms_queued)
916 flush_workqueue(kmpath_rdacd);
917
918 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700919 sdev->scsi_dh_data = NULL;
920 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
921
Moger, Babu3569e532012-02-02 15:21:54 +0000922 spin_lock(&list_lock);
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700923 if (h->ctlr)
924 kref_put(&h->ctlr->kref, release_controller);
Moger, Babu3569e532012-02-02 15:21:54 +0000925 spin_unlock(&list_lock);
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700926 kfree(scsi_dh_data);
927 module_put(THIS_MODULE);
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700928 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME);
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700929}
930
931
932
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700933static int __init rdac_init(void)
934{
935 int r;
936
937 r = scsi_register_device_handler(&rdac_dh);
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700938 if (r != 0) {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700939 printk(KERN_ERR "Failed to register scsi device handler.");
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700940 goto done;
941 }
942
943 /*
944 * Create workqueue to handle mode selects for rdac
945 */
946 kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd");
947 if (!kmpath_rdacd) {
948 scsi_unregister_device_handler(&rdac_dh);
949 printk(KERN_ERR "kmpath_rdacd creation failed.\n");
Richard Weinberger9fc397f2011-11-18 01:44:27 +0100950
951 r = -EINVAL;
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700952 }
953done:
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700954 return r;
955}
956
957static void __exit rdac_exit(void)
958{
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700959 destroy_workqueue(kmpath_rdacd);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700960 scsi_unregister_device_handler(&rdac_dh);
961}
962
963module_init(rdac_init);
964module_exit(rdac_exit);
965
Chauhan, Vijay5f7a6432011-09-02 13:26:32 +0530966MODULE_DESCRIPTION("Multipath LSI/Engenio/NetApp E-Series RDAC driver");
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700967MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
Moger, Babua0b990c2011-02-11 16:12:44 -0700968MODULE_VERSION("01.00.0000.0000");
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700969MODULE_LICENSE("GPL");