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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;
Hannes Reinecke1a5dc162016-03-03 07:54:10 +0100168 struct list_head dh_list;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700169};
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700170
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700171struct 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
184struct rdac_dh_data {
Hannes Reinecke1a5dc162016-03-03 07:54:10 +0100185 struct list_head node;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700186 struct rdac_controller *ctlr;
Hannes Reinecke1a5dc162016-03-03 07:54:10 +0100187 struct scsi_device *sdev;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700188#define UNINITIALIZED_LUN (1 << 8)
189 unsigned lun;
Moger, Babueebe9b92011-04-08 11:37:40 -0600190
191#define RDAC_MODE 0
192#define RDAC_MODE_AVT 1
193#define RDAC_MODE_IOSHIP 2
194 unsigned char mode;
195
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700196#define RDAC_STATE_ACTIVE 0
197#define RDAC_STATE_PASSIVE 1
198 unsigned char state;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700199
200#define RDAC_LUN_UNOWNED 0
201#define RDAC_LUN_OWNED 1
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700202 char lun_state;
Moger, Babueebe9b92011-04-08 11:37:40 -0600203
204#define RDAC_PREFERRED 0
205#define RDAC_NON_PREFERRED 1
206 char preferred;
207
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700208 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
Moger, Babueebe9b92011-04-08 11:37:40 -0600216static const char *mode[] = {
217 "RDAC",
218 "AVT",
219 "IOSHIP",
220};
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700221static const char *lun_state[] =
222{
223 "unowned",
224 "owned",
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700225};
226
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700227struct 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
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700234static LIST_HEAD(ctlr_list);
235static DEFINE_SPINLOCK(list_lock);
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700236static struct workqueue_struct *kmpath_rdacd;
237static void send_mode_select(struct work_struct *work);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700238
Moger, Babudd784ed2009-09-03 21:42:28 -0600239/*
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 */
244static int rdac_logging = 1;
245module_param(rdac_logging, int, S_IRUGO|S_IWUSR);
246MODULE_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...) \
259do { \
260 if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \
261 sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \
262} while (0);
263
Hannes Reinecke32782552016-11-03 14:20:21 +0100264static unsigned int rdac_failover_get(struct rdac_controller *ctlr,
265 struct list_head *list,
266 unsigned char *cdb)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700267{
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700268 struct rdac_mode_common *common;
269 unsigned data_size;
Moger, Babu04b6e152011-02-11 15:14:08 -0700270 struct rdac_queue_data *qdata;
271 u8 *lun_table;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700272
Artem Savkov0648a072017-05-20 09:58:10 +0200273 if (ctlr->use_ms10) {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700274 struct rdac_pg_expanded *rdac_pg;
275
276 data_size = sizeof(struct rdac_pg_expanded);
Artem Savkov0648a072017-05-20 09:58:10 +0200277 rdac_pg = &ctlr->mode_select.expanded;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700278 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;
Moger, Babu04b6e152011-02-11 15:14:08 -0700284 lun_table = rdac_pg->lun_table;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700285 } else {
286 struct rdac_pg_legacy *rdac_pg;
287
288 data_size = sizeof(struct rdac_pg_legacy);
Artem Savkov0648a072017-05-20 09:58:10 +0200289 rdac_pg = &ctlr->mode_select.legacy;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700290 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;
Moger, Babu04b6e152011-02-11 15:14:08 -0700294 lun_table = rdac_pg->lun_table;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700295 }
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
Moger, Babu04b6e152011-02-11 15:14:08 -0700300 list_for_each_entry(qdata, list, entry) {
301 lun_table[qdata->h->lun] = 0x81;
302 }
303
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700304 /* Prepare the command. */
Artem Savkov0648a072017-05-20 09:58:10 +0200305 if (ctlr->use_ms10) {
Hannes Reinecke32782552016-11-03 14:20:21 +0100306 cdb[0] = MODE_SELECT_10;
307 cdb[7] = data_size >> 8;
308 cdb[8] = data_size & 0xff;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700309 } else {
Hannes Reinecke32782552016-11-03 14:20:21 +0100310 cdb[0] = MODE_SELECT;
311 cdb[4] = data_size;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700312 }
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700313
Hannes Reinecke32782552016-11-03 14:20:21 +0100314 return data_size;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700315}
316
317static void release_controller(struct kref *kref)
318{
319 struct rdac_controller *ctlr;
320 ctlr = container_of(kref, struct rdac_controller, kref);
321
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700322 list_del(&ctlr->node);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700323 kfree(ctlr);
324}
325
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700326static struct rdac_controller *get_controller(int index, char *array_name,
Chandra Seetharamand6857592011-07-27 11:22:56 -0700327 u8 *array_id, struct scsi_device *sdev)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700328{
329 struct rdac_controller *ctlr, *tmp;
330
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700331 list_for_each_entry(tmp, &ctlr_list, node) {
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700332 if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) &&
Chandra Seetharamand6857592011-07-27 11:22:56 -0700333 (tmp->index == index) &&
334 (tmp->host == sdev->host)) {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700335 kref_get(&tmp->kref);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700336 return tmp;
337 }
338 }
339 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
340 if (!ctlr)
Moger, Babu3569e532012-02-02 15:21:54 +0000341 return NULL;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700342
343 /* initialize fields of controller */
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700344 memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN);
345 ctlr->index = index;
Chandra Seetharamand6857592011-07-27 11:22:56 -0700346 ctlr->host = sdev->host;
Moger, Babu15276662009-09-03 21:42:21 -0600347 memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN);
348
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700349 kref_init(&ctlr->kref);
350 ctlr->use_ms10 = -1;
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700351 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);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700356 list_add(&ctlr->node, &ctlr_list);
Hannes Reinecke1a5dc162016-03-03 07:54:10 +0100357 INIT_LIST_HEAD(&ctlr->dh_list);
Moger, Babu3569e532012-02-02 15:21:54 +0000358
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700359 return ctlr;
360}
361
Moger, Babu15276662009-09-03 21:42:21 -0600362static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h,
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700363 char *array_name, u8 *array_id)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700364{
Hannes Reinecke32782552016-11-03 14:20:21 +0100365 int err = SCSI_DH_IO, i;
366 struct c8_inquiry *inqp = &h->inq.c8;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700367
Hannes Reinecke32782552016-11-03 14:20:21 +0100368 if (!scsi_get_vpd_page(sdev, 0xC8, (unsigned char *)inqp,
369 sizeof(struct c8_inquiry))) {
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700370 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;
Chandra Seetharaman8479fca2008-08-12 17:26:58 -0700375 h->lun = inqp->lun[7]; /* Uses only the last byte */
Moger, Babu15276662009-09-03 21:42:21 -0600376
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';
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700381 memset(array_id, 0, UNIQUE_ID_LEN);
382 memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len);
Hannes Reinecke32782552016-11-03 14:20:21 +0100383 err = SCSI_DH_OK;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700384 }
385 return err;
386}
387
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700388static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700389{
Hannes Reinecke32782552016-11-03 14:20:21 +0100390 int err = SCSI_DH_IO, access_state;
Hannes Reinecke1a5dc162016-03-03 07:54:10 +0100391 struct rdac_dh_data *tmp;
Hannes Reinecke32782552016-11-03 14:20:21 +0100392 struct c9_inquiry *inqp = &h->inq.c9;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700393
Chandra Seetharaman9eece962008-11-05 20:05:21 -0800394 h->state = RDAC_STATE_ACTIVE;
Hannes Reinecke32782552016-11-03 14:20:21 +0100395 if (!scsi_get_vpd_page(sdev, 0xC9, (unsigned char *)inqp,
396 sizeof(struct c9_inquiry))) {
Moger, Babu1c3afc42011-04-08 11:38:33 -0600397 /* 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 */
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700404
Moger, Babu1c3afc42011-04-08 11:38:33 -0600405 /* Update ownership */
Hannes Reinecke1a5dc162016-03-03 07:54:10 +0100406 if (inqp->avte_cvp & 0x1) {
Moger, Babu1c3afc42011-04-08 11:38:33 -0600407 h->lun_state = RDAC_LUN_OWNED;
Hannes Reinecke1a5dc162016-03-03 07:54:10 +0100408 access_state = SCSI_ACCESS_STATE_OPTIMAL;
409 } else {
Moger, Babu1c3afc42011-04-08 11:38:33 -0600410 h->lun_state = RDAC_LUN_UNOWNED;
Hannes Reinecke1a5dc162016-03-03 07:54:10 +0100411 if (h->mode == RDAC_MODE) {
Moger, Babu1c3afc42011-04-08 11:38:33 -0600412 h->state = RDAC_STATE_PASSIVE;
Hannes Reinecke1a5dc162016-03-03 07:54:10 +0100413 access_state = SCSI_ACCESS_STATE_STANDBY;
414 } else
415 access_state = SCSI_ACCESS_STATE_ACTIVE;
Moger, Babu1c3afc42011-04-08 11:38:33 -0600416 }
417
418 /* Update path prio*/
Hannes Reinecke1a5dc162016-03-03 07:54:10 +0100419 if (inqp->path_prio & 0x1) {
Moger, Babu1c3afc42011-04-08 11:38:33 -0600420 h->preferred = RDAC_PREFERRED;
Hannes Reinecke1a5dc162016-03-03 07:54:10 +0100421 access_state |= SCSI_ACCESS_STATE_PREFERRED;
422 } else
Moger, Babu1c3afc42011-04-08 11:38:33 -0600423 h->preferred = RDAC_NON_PREFERRED;
Hannes Reinecke1a5dc162016-03-03 07:54:10 +0100424 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();
Hannes Reinecke32782552016-11-03 14:20:21 +0100431 err = SCSI_DH_OK;
Moger, Babu1c3afc42011-04-08 11:38:33 -0600432 }
Chandra Seetharaman5a367562008-08-21 23:12:40 -0700433
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700434 return err;
435}
436
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700437static int initialize_controller(struct scsi_device *sdev,
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700438 struct rdac_dh_data *h, char *array_name, u8 *array_id)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700439{
Hannes Reinecke32782552016-11-03 14:20:21 +0100440 int err = SCSI_DH_IO, index;
441 struct c4_inquiry *inqp = &h->inq.c4;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700442
Hannes Reinecke32782552016-11-03 14:20:21 +0100443 if (!scsi_get_vpd_page(sdev, 0xC4, (unsigned char *)inqp,
444 sizeof(struct c4_inquiry))) {
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700445 /* get the controller index */
446 if (inqp->slot_id[1] == 0x31)
447 index = 0;
448 else
449 index = 1;
Moger, Babu3569e532012-02-02 15:21:54 +0000450
451 spin_lock(&list_lock);
Chandra Seetharamand6857592011-07-27 11:22:56 -0700452 h->ctlr = get_controller(index, array_name, array_id, sdev);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700453 if (!h->ctlr)
454 err = SCSI_DH_RES_TEMP_UNAVAIL;
Hannes Reinecke1a5dc162016-03-03 07:54:10 +0100455 else {
Hannes Reinecke1a5dc162016-03-03 07:54:10 +0100456 h->sdev = sdev;
Ye Binbc546c02021-01-13 14:31:03 +0800457 list_add_rcu(&h->node, &h->ctlr->dh_list);
Hannes Reinecke1a5dc162016-03-03 07:54:10 +0100458 }
Moger, Babu3569e532012-02-02 15:21:54 +0000459 spin_unlock(&list_lock);
Hannes Reinecke32782552016-11-03 14:20:21 +0100460 err = SCSI_DH_OK;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700461 }
462 return err;
463}
464
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700465static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700466{
Hannes Reinecke32782552016-11-03 14:20:21 +0100467 int err = SCSI_DH_IO;
468 struct c2_inquiry *inqp = &h->inq.c2;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700469
Hannes Reinecke32782552016-11-03 14:20:21 +0100470 if (!scsi_get_vpd_page(sdev, 0xC2, (unsigned char *)inqp,
471 sizeof(struct c2_inquiry))) {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700472 /*
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;
Hannes Reinecke32782552016-11-03 14:20:21 +0100480 err = SCSI_DH_OK;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700481 }
482 return err;
483}
484
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700485static int mode_select_handle_sense(struct scsi_device *sdev,
Hannes Reinecke32782552016-11-03 14:20:21 +0100486 struct scsi_sense_hdr *sense_hdr)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700487{
Hannes Reinecke32782552016-11-03 14:20:21 +0100488 int err = SCSI_DH_IO;
Christoph Hellwigee14c672015-08-27 14:16:59 +0200489 struct rdac_dh_data *h = sdev->handler_data;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700490
Hannes Reinecke32782552016-11-03 14:20:21 +0100491 if (!scsi_sense_valid(sense_hdr))
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700492 goto done;
493
Hannes Reinecke32782552016-11-03 14:20:21 +0100494 switch (sense_hdr->sense_key) {
Chauhan, Vijay7687fb92009-03-04 12:17:54 +0530495 case NO_SENSE:
496 case ABORTED_COMMAND:
497 case UNIT_ATTENTION:
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700498 err = SCSI_DH_RETRY;
Chauhan, Vijay7687fb92009-03-04 12:17:54 +0530499 break;
500 case NOT_READY:
Hannes Reinecke32782552016-11-03 14:20:21 +0100501 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
Chauhan, Vijay7687fb92009-03-04 12:17:54 +0530502 /* LUN Not Ready and is in the Process of Becoming
503 * Ready
504 */
505 err = SCSI_DH_RETRY;
506 break;
507 case ILLEGAL_REQUEST:
Hannes Reinecke32782552016-11-03 14:20:21 +0100508 if (sense_hdr->asc == 0x91 && sense_hdr->ascq == 0x36)
Chauhan, Vijay7687fb92009-03-04 12:17:54 +0530509 /*
510 * Command Lock contention
511 */
Hannes Reinecked2d06d42016-01-22 15:42:41 +0100512 err = SCSI_DH_IMM_RETRY;
Chauhan, Vijay7687fb92009-03-04 12:17:54 +0530513 break;
514 default:
Moger, Babudd784ed2009-09-03 21:42:28 -0600515 break;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700516 }
517
Moger, Babudd784ed2009-09-03 21:42:28 -0600518 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,
Hannes Reinecke32782552016-11-03 14:20:21 +0100521 sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
Moger, Babudd784ed2009-09-03 21:42:28 -0600522
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700523done:
524 return err;
525}
526
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700527static void send_mode_select(struct work_struct *work)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700528{
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700529 struct rdac_controller *ctlr =
530 container_of(work, struct rdac_controller, ms_work);
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700531 struct scsi_device *sdev = ctlr->ms_sdev;
Christoph Hellwigee14c672015-08-27 14:16:59 +0200532 struct rdac_dh_data *h = sdev->handler_data;
Hannes Reinecke32782552016-11-03 14:20:21 +0100533 int err = SCSI_DH_OK, retry_cnt = RDAC_RETRY_COUNT;
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700534 struct rdac_queue_data *tmp, *qdata;
535 LIST_HEAD(list);
Stephen Kitt92eb5062018-03-09 23:32:11 +0100536 unsigned char cdb[MAX_COMMAND_SIZE];
Hannes Reinecke32782552016-11-03 14:20:21 +0100537 struct scsi_sense_hdr sshdr;
538 unsigned int data_size;
539 u64 req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
540 REQ_FAILFAST_DRIVER;
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700541
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
Hannes Reinecke32782552016-11-03 14:20:21 +0100548 retry:
Martin Wilck57adf5d2019-09-04 15:52:29 +0000549 memset(cdb, 0, sizeof(cdb));
550
Hannes Reinecke32782552016-11-03 14:20:21 +0100551 data_size = rdac_failover_get(ctlr, &list, cdb);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700552
Moger, Babudd784ed2009-09-03 21:42:28 -0600553 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
554 "%s MODE_SELECT command",
555 (char *) h->ctlr->array_name, h->ctlr->index,
Chandra Seetharamanc85f8cb92008-11-05 20:06:37 -0800556 (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying");
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700557
Christoph Hellwigfcbfffe2017-02-23 16:02:37 +0100558 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)) {
Hannes Reinecke32782552016-11-03 14:20:21 +0100561 err = mode_select_handle_sense(sdev, &sshdr);
Chandra Seetharamanc85f8cb92008-11-05 20:06:37 -0800562 if (err == SCSI_DH_RETRY && retry_cnt--)
563 goto retry;
Hannes Reinecked2d06d42016-01-22 15:42:41 +0100564 if (err == SCSI_DH_IMM_RETRY)
565 goto retry;
Chandra Seetharamanc85f8cb92008-11-05 20:06:37 -0800566 }
Moger, Babudd784ed2009-09-03 21:42:28 -0600567 if (err == SCSI_DH_OK) {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700568 h->state = RDAC_STATE_ACTIVE;
Moger, Babudd784ed2009-09-03 21:42:28 -0600569 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
570 "MODE_SELECT completed",
571 (char *) h->ctlr->array_name, h->ctlr->index);
572 }
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700573
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700574 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
585static 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
Christoph Hellwigee14c672015-08-27 14:16:59 +0200595 qdata->h = sdev->handler_data;
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700596 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;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700609}
610
Chandra Seetharaman3ae31f62009-10-21 09:22:46 -0700611static int rdac_activate(struct scsi_device *sdev,
612 activate_complete fn, void *data)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700613{
Christoph Hellwigee14c672015-08-27 14:16:59 +0200614 struct rdac_dh_data *h = sdev->handler_data;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700615 int err = SCSI_DH_OK;
Moger, Babu3425fbf2011-04-08 11:39:30 -0600616 int act = 0;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700617
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700618 err = check_ownership(sdev, h);
619 if (err != SCSI_DH_OK)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700620 goto done;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700621
Moger, Babu3425fbf2011-04-08 11:39:30 -0600622 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) {
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700637 err = queue_mode_select(sdev, fn, data);
638 if (err == SCSI_DH_OK)
639 return 0;
640 }
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700641done:
Chandra Seetharaman3ae31f62009-10-21 09:22:46 -0700642 if (fn)
643 fn(data, err);
644 return 0;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700645}
646
Christoph Hellwig4c1cb672018-11-09 14:42:40 +0100647static blk_status_t rdac_prep_fn(struct scsi_device *sdev, struct request *req)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700648{
Christoph Hellwigee14c672015-08-27 14:16:59 +0200649 struct rdac_dh_data *h = sdev->handler_data;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700650
651 if (h->state != RDAC_STATE_ACTIVE) {
Christoph Hellwige8064022016-10-20 15:12:13 +0200652 req->rq_flags |= RQF_QUIET;
Christoph Hellwig4c1cb672018-11-09 14:42:40 +0100653 return BLK_STS_IOERR;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700654 }
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700655
Christoph Hellwig4c1cb672018-11-09 14:42:40 +0100656 return BLK_STS_OK;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700657}
658
Bart Van Asscheb8e162f2021-04-15 15:08:11 -0700659static enum scsi_disposition rdac_check_sense(struct scsi_device *sdev,
660 struct scsi_sense_hdr *sense_hdr)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700661{
Christoph Hellwigee14c672015-08-27 14:16:59 +0200662 struct rdac_dh_data *h = sdev->handler_data;
Moger, Babudd784ed2009-09-03 21:42:28 -0600663
664 RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, "
665 "I/O returned with sense %02x/%02x/%02x",
666 (char *) h->ctlr->array_name, h->ctlr->index,
667 sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
668
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700669 switch (sense_hdr->sense_key) {
670 case NOT_READY:
Chauhan, Vijay8f032262009-04-20 18:14:23 +0530671 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
672 /* LUN Not Ready - Logical Unit Not Ready and is in
673 * the process of becoming ready
674 * Just retry.
675 */
676 return ADD_TO_MLQUEUE;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700677 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81)
678 /* LUN Not Ready - Storage firmware incompatible
679 * Manual code synchonisation required.
680 *
681 * Nothing we can do here. Try to bypass the path.
682 */
683 return SUCCESS;
684 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1)
685 /* LUN Not Ready - Quiescense in progress
686 *
687 * Just retry and wait.
688 */
Mike Andersonc7dbb622008-08-12 12:11:57 -0700689 return ADD_TO_MLQUEUE;
Chauhan, Vijayaf50bb92009-03-17 18:51:40 +0530690 if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02)
691 /* LUN Not Ready - Quiescense in progress
692 * or has been achieved
693 * Just retry.
694 */
695 return ADD_TO_MLQUEUE;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700696 break;
697 case ILLEGAL_REQUEST:
698 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) {
699 /* Invalid Request - Current Logical Unit Ownership.
700 * Controller is not the current owner of the LUN,
701 * Fail the path, so that the other path be used.
702 */
703 h->state = RDAC_STATE_PASSIVE;
704 return SUCCESS;
705 }
706 break;
707 case UNIT_ATTENTION:
708 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
709 /*
710 * Power On, Reset, or Bus Device Reset, just retry.
711 */
Mike Andersonc7dbb622008-08-12 12:11:57 -0700712 return ADD_TO_MLQUEUE;
Chauhan, Vijayea41e412009-01-26 21:29:37 +0530713 if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02)
714 /*
715 * Quiescence in progress , just retry.
716 */
717 return ADD_TO_MLQUEUE;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700718 break;
719 }
720 /* success just means we do not care what scsi-ml does */
721 return SCSI_RETURN_NOT_HANDLED;
722}
723
Christoph Hellwigee14c672015-08-27 14:16:59 +0200724static int rdac_bus_attach(struct scsi_device *sdev)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700725{
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700726 struct rdac_dh_data *h;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700727 int err;
Moger, Babu15276662009-09-03 21:42:21 -0600728 char array_name[ARRAY_LABEL_LEN];
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700729 char array_id[UNIQUE_ID_LEN];
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700730
Christoph Hellwigcd377432014-09-13 19:59:51 -0700731 h = kzalloc(sizeof(*h) , GFP_KERNEL);
Christoph Hellwig1d520322014-09-14 11:08:21 -0700732 if (!h)
Hannes Reinecke2a8f7a02017-09-20 09:18:51 +0200733 return SCSI_DH_NOMEM;
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700734 h->lun = UNINITIALIZED_LUN;
735 h->state = RDAC_STATE_ACTIVE;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700736
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700737 err = get_lun_info(sdev, h, array_name, array_id);
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700738 if (err != SCSI_DH_OK)
739 goto failed;
740
Chandra Seetharamana53becc2011-07-20 14:18:56 -0700741 err = initialize_controller(sdev, h, array_name, array_id);
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700742 if (err != SCSI_DH_OK)
743 goto failed;
744
Moger, Babu87b79a52009-09-03 21:42:15 -0600745 err = check_ownership(sdev, h);
746 if (err != SCSI_DH_OK)
747 goto clean_ctlr;
748
749 err = set_mode_select(sdev, h);
750 if (err != SCSI_DH_OK)
751 goto clean_ctlr;
752
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700753 sdev_printk(KERN_NOTICE, sdev,
Moger, Babueebe9b92011-04-08 11:37:40 -0600754 "%s: LUN %d (%s) (%s)\n",
755 RDAC_NAME, h->lun, mode[(int)h->mode],
756 lun_state[(int)h->lun_state]);
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700757
Christoph Hellwigee14c672015-08-27 14:16:59 +0200758 sdev->handler_data = h;
Hannes Reinecke2a8f7a02017-09-20 09:18:51 +0200759 return SCSI_DH_OK;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700760
Moger, Babu87b79a52009-09-03 21:42:15 -0600761clean_ctlr:
Moger, Babu3569e532012-02-02 15:21:54 +0000762 spin_lock(&list_lock);
Moger, Babu87b79a52009-09-03 21:42:15 -0600763 kref_put(&h->ctlr->kref, release_controller);
Moger, Babu3569e532012-02-02 15:21:54 +0000764 spin_unlock(&list_lock);
Moger, Babu87b79a52009-09-03 21:42:15 -0600765
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700766failed:
Christoph Hellwigcd377432014-09-13 19:59:51 -0700767 kfree(h);
Hannes Reinecke2a8f7a02017-09-20 09:18:51 +0200768 return err;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700769}
770
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700771static void rdac_bus_detach( struct scsi_device *sdev )
772{
Christoph Hellwigee14c672015-08-27 14:16:59 +0200773 struct rdac_dh_data *h = sdev->handler_data;
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700774
Moger, Babu3569e532012-02-02 15:21:54 +0000775 if (h->ctlr && h->ctlr->ms_queued)
776 flush_workqueue(kmpath_rdacd);
777
Moger, Babu3569e532012-02-02 15:21:54 +0000778 spin_lock(&list_lock);
Hannes Reinecke1a5dc162016-03-03 07:54:10 +0100779 if (h->ctlr) {
780 list_del_rcu(&h->node);
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700781 kref_put(&h->ctlr->kref, release_controller);
Hannes Reinecke1a5dc162016-03-03 07:54:10 +0100782 }
Moger, Babu3569e532012-02-02 15:21:54 +0000783 spin_unlock(&list_lock);
Christoph Hellwigee14c672015-08-27 14:16:59 +0200784 sdev->handler_data = NULL;
Ye Binbc546c02021-01-13 14:31:03 +0800785 synchronize_rcu();
Christoph Hellwigcd377432014-09-13 19:59:51 -0700786 kfree(h);
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700787}
788
Christoph Hellwig1d520322014-09-14 11:08:21 -0700789static struct scsi_device_handler rdac_dh = {
790 .name = RDAC_NAME,
791 .module = THIS_MODULE,
792 .prep_fn = rdac_prep_fn,
793 .check_sense = rdac_check_sense,
794 .attach = rdac_bus_attach,
795 .detach = rdac_bus_detach,
796 .activate = rdac_activate,
Christoph Hellwig1d520322014-09-14 11:08:21 -0700797};
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700798
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700799static int __init rdac_init(void)
800{
801 int r;
802
803 r = scsi_register_device_handler(&rdac_dh);
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700804 if (r != 0) {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700805 printk(KERN_ERR "Failed to register scsi device handler.");
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700806 goto done;
807 }
808
809 /*
810 * Create workqueue to handle mode selects for rdac
811 */
812 kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd");
813 if (!kmpath_rdacd) {
814 scsi_unregister_device_handler(&rdac_dh);
815 printk(KERN_ERR "kmpath_rdacd creation failed.\n");
Richard Weinberger9fc397f2011-11-18 01:44:27 +0100816
817 r = -EINVAL;
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700818 }
819done:
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700820 return r;
821}
822
823static void __exit rdac_exit(void)
824{
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700825 destroy_workqueue(kmpath_rdacd);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700826 scsi_unregister_device_handler(&rdac_dh);
827}
828
829module_init(rdac_init);
830module_exit(rdac_exit);
831
Chauhan, Vijay5f7a6432011-09-02 13:26:32 +0530832MODULE_DESCRIPTION("Multipath LSI/Engenio/NetApp E-Series RDAC driver");
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700833MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
Moger, Babua0b990c2011-02-11 16:12:44 -0700834MODULE_VERSION("01.00.0000.0000");
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700835MODULE_LICENSE("GPL");