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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>
Chandra Seetharaman970f3f42009-10-21 09:22:51 -070025#include <linux/workqueue.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090026#include <linux/slab.h>
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -070027
28#define RDAC_NAME "rdac"
Chandra Seetharamanc85f8cb92008-11-05 20:06:37 -080029#define RDAC_RETRY_COUNT 5
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -070030
31/*
32 * LSI mode page stuff
33 *
34 * These struct definitions and the forming of the
35 * mode page were taken from the LSI RDAC 2.4 GPL'd
36 * driver, and then converted to Linux conventions.
37 */
38#define RDAC_QUIESCENCE_TIME 20;
39/*
40 * Page Codes
41 */
42#define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c
43
44/*
45 * Controller modes definitions
46 */
47#define RDAC_MODE_TRANSFER_SPECIFIED_LUNS 0x02
48
49/*
50 * RDAC Options field
51 */
52#define RDAC_FORCED_QUIESENCE 0x02
53
54#define RDAC_TIMEOUT (60 * HZ)
55#define RDAC_RETRIES 3
56
57struct rdac_mode_6_hdr {
58 u8 data_len;
59 u8 medium_type;
60 u8 device_params;
61 u8 block_desc_len;
62};
63
64struct rdac_mode_10_hdr {
65 u16 data_len;
66 u8 medium_type;
67 u8 device_params;
68 u16 reserved;
69 u16 block_desc_len;
70};
71
72struct rdac_mode_common {
73 u8 controller_serial[16];
74 u8 alt_controller_serial[16];
75 u8 rdac_mode[2];
76 u8 alt_rdac_mode[2];
77 u8 quiescence_timeout;
78 u8 rdac_options;
79};
80
81struct rdac_pg_legacy {
82 struct rdac_mode_6_hdr hdr;
83 u8 page_code;
84 u8 page_len;
85 struct rdac_mode_common common;
86#define MODE6_MAX_LUN 32
87 u8 lun_table[MODE6_MAX_LUN];
88 u8 reserved2[32];
89 u8 reserved3;
90 u8 reserved4;
91};
92
93struct rdac_pg_expanded {
94 struct rdac_mode_10_hdr hdr;
95 u8 page_code;
96 u8 subpage_code;
97 u8 page_len[2];
98 struct rdac_mode_common common;
99 u8 lun_table[256];
100 u8 reserved3;
101 u8 reserved4;
102};
103
104struct c9_inquiry {
105 u8 peripheral_info;
106 u8 page_code; /* 0xC9 */
107 u8 reserved1;
108 u8 page_len;
109 u8 page_id[4]; /* "vace" */
110 u8 avte_cvp;
111 u8 path_prio;
112 u8 reserved2[38];
113};
114
115#define SUBSYS_ID_LEN 16
116#define SLOT_ID_LEN 2
Moger, Babu15276662009-09-03 21:42:21 -0600117#define ARRAY_LABEL_LEN 31
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700118
119struct c4_inquiry {
120 u8 peripheral_info;
121 u8 page_code; /* 0xC4 */
122 u8 reserved1;
123 u8 page_len;
124 u8 page_id[4]; /* "subs" */
125 u8 subsys_id[SUBSYS_ID_LEN];
126 u8 revision[4];
127 u8 slot_id[SLOT_ID_LEN];
128 u8 reserved[2];
129};
130
131struct rdac_controller {
132 u8 subsys_id[SUBSYS_ID_LEN];
133 u8 slot_id[SLOT_ID_LEN];
134 int use_ms10;
135 struct kref kref;
136 struct list_head node; /* list of all controllers */
137 union {
138 struct rdac_pg_legacy legacy;
139 struct rdac_pg_expanded expanded;
140 } mode_select;
Moger, Babu15276662009-09-03 21:42:21 -0600141 u8 index;
142 u8 array_name[ARRAY_LABEL_LEN];
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700143 spinlock_t ms_lock;
144 int ms_queued;
145 struct work_struct ms_work;
146 struct scsi_device *ms_sdev;
147 struct list_head ms_head;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700148};
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700149
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700150struct c8_inquiry {
151 u8 peripheral_info;
152 u8 page_code; /* 0xC8 */
153 u8 reserved1;
154 u8 page_len;
155 u8 page_id[4]; /* "edid" */
156 u8 reserved2[3];
157 u8 vol_uniq_id_len;
158 u8 vol_uniq_id[16];
159 u8 vol_user_label_len;
160 u8 vol_user_label[60];
161 u8 array_uniq_id_len;
162 u8 array_unique_id[16];
163 u8 array_user_label_len;
164 u8 array_user_label[60];
165 u8 lun[8];
166};
167
168struct c2_inquiry {
169 u8 peripheral_info;
170 u8 page_code; /* 0xC2 */
171 u8 reserved1;
172 u8 page_len;
173 u8 page_id[4]; /* "swr4" */
174 u8 sw_version[3];
175 u8 sw_date[3];
176 u8 features_enabled;
177 u8 max_lun_supported;
178 u8 partitions[239]; /* Total allocation length should be 0xFF */
179};
180
181struct rdac_dh_data {
182 struct rdac_controller *ctlr;
183#define UNINITIALIZED_LUN (1 << 8)
184 unsigned lun;
185#define RDAC_STATE_ACTIVE 0
186#define RDAC_STATE_PASSIVE 1
187 unsigned char state;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700188
189#define RDAC_LUN_UNOWNED 0
190#define RDAC_LUN_OWNED 1
191#define RDAC_LUN_AVT 2
192 char lun_state;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700193 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
194 union {
195 struct c2_inquiry c2;
196 struct c4_inquiry c4;
197 struct c8_inquiry c8;
198 struct c9_inquiry c9;
199 } inq;
200};
201
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700202static const char *lun_state[] =
203{
204 "unowned",
205 "owned",
206 "owned (AVT mode)",
207};
208
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700209struct rdac_queue_data {
210 struct list_head entry;
211 struct rdac_dh_data *h;
212 activate_complete callback_fn;
213 void *callback_data;
214};
215
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700216static LIST_HEAD(ctlr_list);
217static DEFINE_SPINLOCK(list_lock);
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700218static struct workqueue_struct *kmpath_rdacd;
219static void send_mode_select(struct work_struct *work);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700220
Moger, Babudd784ed2009-09-03 21:42:28 -0600221/*
222 * module parameter to enable rdac debug logging.
223 * 2 bits for each type of logging, only two types defined for now
224 * Can be enhanced if required at later point
225 */
226static int rdac_logging = 1;
227module_param(rdac_logging, int, S_IRUGO|S_IWUSR);
228MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, "
229 "Default is 1 - failover logging enabled, "
230 "set it to 0xF to enable all the logs");
231
232#define RDAC_LOG_FAILOVER 0
233#define RDAC_LOG_SENSE 2
234
235#define RDAC_LOG_BITS 2
236
237#define RDAC_LOG_LEVEL(SHIFT) \
238 ((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1))
239
240#define RDAC_LOG(SHIFT, sdev, f, arg...) \
241do { \
242 if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \
243 sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \
244} while (0);
245
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700246static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev)
247{
248 struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
249 BUG_ON(scsi_dh_data == NULL);
250 return ((struct rdac_dh_data *) scsi_dh_data->buf);
251}
252
253static struct request *get_rdac_req(struct scsi_device *sdev,
254 void *buffer, unsigned buflen, int rw)
255{
256 struct request *rq;
257 struct request_queue *q = sdev->request_queue;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700258
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700259 rq = blk_get_request(q, rw, GFP_NOIO);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700260
261 if (!rq) {
262 sdev_printk(KERN_INFO, sdev,
263 "get_rdac_req: blk_get_request failed.\n");
264 return NULL;
265 }
266
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700267 if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700268 blk_put_request(rq);
269 sdev_printk(KERN_INFO, sdev,
270 "get_rdac_req: blk_rq_map_kern failed.\n");
271 return NULL;
272 }
273
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700274 rq->cmd_type = REQ_TYPE_BLOCK_PC;
Mike Christie6000a362008-08-19 18:45:30 -0500275 rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
276 REQ_FAILFAST_DRIVER;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700277 rq->retries = RDAC_RETRIES;
278 rq->timeout = RDAC_TIMEOUT;
279
280 return rq;
281}
282
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700283static struct request *rdac_failover_get(struct scsi_device *sdev,
284 struct rdac_dh_data *h)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700285{
286 struct request *rq;
287 struct rdac_mode_common *common;
288 unsigned data_size;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700289
290 if (h->ctlr->use_ms10) {
291 struct rdac_pg_expanded *rdac_pg;
292
293 data_size = sizeof(struct rdac_pg_expanded);
294 rdac_pg = &h->ctlr->mode_select.expanded;
295 memset(rdac_pg, 0, data_size);
296 common = &rdac_pg->common;
297 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40;
298 rdac_pg->subpage_code = 0x1;
299 rdac_pg->page_len[0] = 0x01;
300 rdac_pg->page_len[1] = 0x28;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700301 } else {
302 struct rdac_pg_legacy *rdac_pg;
303
304 data_size = sizeof(struct rdac_pg_legacy);
305 rdac_pg = &h->ctlr->mode_select.legacy;
306 memset(rdac_pg, 0, data_size);
307 common = &rdac_pg->common;
308 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER;
309 rdac_pg->page_len = 0x68;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700310 }
311 common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS;
312 common->quiescence_timeout = RDAC_QUIESCENCE_TIME;
313 common->rdac_options = RDAC_FORCED_QUIESENCE;
314
315 /* get request for block layer packet command */
316 rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE);
317 if (!rq)
318 return NULL;
319
320 /* Prepare the command. */
321 if (h->ctlr->use_ms10) {
322 rq->cmd[0] = MODE_SELECT_10;
323 rq->cmd[7] = data_size >> 8;
324 rq->cmd[8] = data_size & 0xff;
325 } else {
326 rq->cmd[0] = MODE_SELECT;
327 rq->cmd[4] = data_size;
328 }
329 rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
330
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700331 rq->sense = h->sense;
332 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
333 rq->sense_len = 0;
334
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700335 return rq;
336}
337
338static void release_controller(struct kref *kref)
339{
340 struct rdac_controller *ctlr;
341 ctlr = container_of(kref, struct rdac_controller, kref);
342
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700343 flush_workqueue(kmpath_rdacd);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700344 spin_lock(&list_lock);
345 list_del(&ctlr->node);
346 spin_unlock(&list_lock);
347 kfree(ctlr);
348}
349
Moger, Babu15276662009-09-03 21:42:21 -0600350static struct rdac_controller *get_controller(u8 *subsys_id, u8 *slot_id,
351 char *array_name)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700352{
353 struct rdac_controller *ctlr, *tmp;
354
355 spin_lock(&list_lock);
356
357 list_for_each_entry(tmp, &ctlr_list, node) {
358 if ((memcmp(tmp->subsys_id, subsys_id, SUBSYS_ID_LEN) == 0) &&
359 (memcmp(tmp->slot_id, slot_id, SLOT_ID_LEN) == 0)) {
360 kref_get(&tmp->kref);
361 spin_unlock(&list_lock);
362 return tmp;
363 }
364 }
365 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
366 if (!ctlr)
367 goto done;
368
369 /* initialize fields of controller */
370 memcpy(ctlr->subsys_id, subsys_id, SUBSYS_ID_LEN);
371 memcpy(ctlr->slot_id, slot_id, SLOT_ID_LEN);
Moger, Babu15276662009-09-03 21:42:21 -0600372 memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN);
373
374 /* update the controller index */
375 if (slot_id[1] == 0x31)
376 ctlr->index = 0;
377 else
378 ctlr->index = 1;
379
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700380 kref_init(&ctlr->kref);
381 ctlr->use_ms10 = -1;
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700382 ctlr->ms_queued = 0;
383 ctlr->ms_sdev = NULL;
384 spin_lock_init(&ctlr->ms_lock);
385 INIT_WORK(&ctlr->ms_work, send_mode_select);
386 INIT_LIST_HEAD(&ctlr->ms_head);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700387 list_add(&ctlr->node, &ctlr_list);
388done:
389 spin_unlock(&list_lock);
390 return ctlr;
391}
392
393static int submit_inquiry(struct scsi_device *sdev, int page_code,
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700394 unsigned int len, struct rdac_dh_data *h)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700395{
396 struct request *rq;
397 struct request_queue *q = sdev->request_queue;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700398 int err = SCSI_DH_RES_TEMP_UNAVAIL;
399
400 rq = get_rdac_req(sdev, &h->inq, len, READ);
401 if (!rq)
402 goto done;
403
404 /* Prepare the command. */
405 rq->cmd[0] = INQUIRY;
406 rq->cmd[1] = 1;
407 rq->cmd[2] = page_code;
408 rq->cmd[4] = len;
409 rq->cmd_len = COMMAND_SIZE(INQUIRY);
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700410
411 rq->sense = h->sense;
412 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
413 rq->sense_len = 0;
414
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700415 err = blk_execute_rq(q, NULL, rq, 1);
416 if (err == -EIO)
417 err = SCSI_DH_IO;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700418
419 blk_put_request(rq);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700420done:
421 return err;
422}
423
Moger, Babu15276662009-09-03 21:42:21 -0600424static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h,
425 char *array_name)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700426{
Moger, Babu15276662009-09-03 21:42:21 -0600427 int err, i;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700428 struct c8_inquiry *inqp;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700429
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700430 err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700431 if (err == SCSI_DH_OK) {
432 inqp = &h->inq.c8;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700433 if (inqp->page_code != 0xc8)
434 return SCSI_DH_NOSYS;
435 if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' ||
436 inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd')
437 return SCSI_DH_NOSYS;
Chandra Seetharaman8479fca2008-08-12 17:26:58 -0700438 h->lun = inqp->lun[7]; /* Uses only the last byte */
Moger, Babu15276662009-09-03 21:42:21 -0600439
440 for(i=0; i<ARRAY_LABEL_LEN-1; ++i)
441 *(array_name+i) = inqp->array_user_label[(2*i)+1];
442
443 *(array_name+ARRAY_LABEL_LEN-1) = '\0';
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700444 }
445 return err;
446}
447
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700448static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700449{
450 int err;
451 struct c9_inquiry *inqp;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700452
Chandra Seetharamanfe426252008-08-12 17:26:59 -0700453 h->lun_state = RDAC_LUN_UNOWNED;
Chandra Seetharaman9eece962008-11-05 20:05:21 -0800454 h->state = RDAC_STATE_ACTIVE;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700455 err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700456 if (err == SCSI_DH_OK) {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700457 inqp = &h->inq.c9;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700458 if ((inqp->avte_cvp >> 7) == 0x1) {
459 /* LUN in AVT mode */
460 sdev_printk(KERN_NOTICE, sdev,
461 "%s: AVT mode detected\n",
462 RDAC_NAME);
463 h->lun_state = RDAC_LUN_AVT;
464 } else if ((inqp->avte_cvp & 0x1) != 0) {
465 /* LUN was owned by the controller */
466 h->lun_state = RDAC_LUN_OWNED;
467 }
468 }
469
Chandra Seetharaman5a367562008-08-21 23:12:40 -0700470 if (h->lun_state == RDAC_LUN_UNOWNED)
471 h->state = RDAC_STATE_PASSIVE;
472
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700473 return err;
474}
475
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700476static int initialize_controller(struct scsi_device *sdev,
Moger, Babu15276662009-09-03 21:42:21 -0600477 struct rdac_dh_data *h, char *array_name)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700478{
479 int err;
480 struct c4_inquiry *inqp;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700481
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700482 err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700483 if (err == SCSI_DH_OK) {
484 inqp = &h->inq.c4;
Moger, Babu15276662009-09-03 21:42:21 -0600485 h->ctlr = get_controller(inqp->subsys_id, inqp->slot_id,
486 array_name);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700487 if (!h->ctlr)
488 err = SCSI_DH_RES_TEMP_UNAVAIL;
489 }
490 return err;
491}
492
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700493static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700494{
495 int err;
496 struct c2_inquiry *inqp;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700497
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700498 err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700499 if (err == SCSI_DH_OK) {
500 inqp = &h->inq.c2;
501 /*
502 * If more than MODE6_MAX_LUN luns are supported, use
503 * mode select 10
504 */
505 if (inqp->max_lun_supported >= MODE6_MAX_LUN)
506 h->ctlr->use_ms10 = 1;
507 else
508 h->ctlr->use_ms10 = 0;
509 }
510 return err;
511}
512
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700513static int mode_select_handle_sense(struct scsi_device *sdev,
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700514 unsigned char *sensebuf)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700515{
516 struct scsi_sense_hdr sense_hdr;
Chauhan, Vijay7687fb92009-03-04 12:17:54 +0530517 int err = SCSI_DH_IO, ret;
Moger, Babudd784ed2009-09-03 21:42:28 -0600518 struct rdac_dh_data *h = get_rdac_data(sdev);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700519
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700520 ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700521 if (!ret)
522 goto done;
523
Chauhan, Vijay7687fb92009-03-04 12:17:54 +0530524 switch (sense_hdr.sense_key) {
525 case NO_SENSE:
526 case ABORTED_COMMAND:
527 case UNIT_ATTENTION:
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700528 err = SCSI_DH_RETRY;
Chauhan, Vijay7687fb92009-03-04 12:17:54 +0530529 break;
530 case NOT_READY:
531 if (sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x01)
532 /* LUN Not Ready and is in the Process of Becoming
533 * Ready
534 */
535 err = SCSI_DH_RETRY;
536 break;
537 case ILLEGAL_REQUEST:
538 if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36)
539 /*
540 * Command Lock contention
541 */
542 err = SCSI_DH_RETRY;
543 break;
544 default:
Moger, Babudd784ed2009-09-03 21:42:28 -0600545 break;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700546 }
547
Moger, Babudd784ed2009-09-03 21:42:28 -0600548 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
549 "MODE_SELECT returned with sense %02x/%02x/%02x",
550 (char *) h->ctlr->array_name, h->ctlr->index,
551 sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq);
552
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700553done:
554 return err;
555}
556
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700557static void send_mode_select(struct work_struct *work)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700558{
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700559 struct rdac_controller *ctlr =
560 container_of(work, struct rdac_controller, ms_work);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700561 struct request *rq;
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700562 struct scsi_device *sdev = ctlr->ms_sdev;
563 struct rdac_dh_data *h = get_rdac_data(sdev);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700564 struct request_queue *q = sdev->request_queue;
Chandra Seetharamanc85f8cb92008-11-05 20:06:37 -0800565 int err, retry_cnt = RDAC_RETRY_COUNT;
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700566 struct rdac_queue_data *tmp, *qdata;
567 LIST_HEAD(list);
568 u8 *lun_table;
569
570 spin_lock(&ctlr->ms_lock);
571 list_splice_init(&ctlr->ms_head, &list);
572 ctlr->ms_queued = 0;
573 ctlr->ms_sdev = NULL;
574 spin_unlock(&ctlr->ms_lock);
575
576 if (ctlr->use_ms10)
577 lun_table = ctlr->mode_select.expanded.lun_table;
578 else
579 lun_table = ctlr->mode_select.legacy.lun_table;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700580
Chandra Seetharamanc85f8cb92008-11-05 20:06:37 -0800581retry:
582 err = SCSI_DH_RES_TEMP_UNAVAIL;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700583 rq = rdac_failover_get(sdev, h);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700584 if (!rq)
585 goto done;
586
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700587 list_for_each_entry(qdata, &list, entry) {
588 lun_table[qdata->h->lun] = 0x81;
589 }
590
Moger, Babudd784ed2009-09-03 21:42:28 -0600591 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
592 "%s MODE_SELECT command",
593 (char *) h->ctlr->array_name, h->ctlr->index,
Chandra Seetharamanc85f8cb92008-11-05 20:06:37 -0800594 (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying");
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700595
596 err = blk_execute_rq(q, NULL, rq, 1);
Chandra Seetharamanc85f8cb92008-11-05 20:06:37 -0800597 blk_put_request(rq);
598 if (err != SCSI_DH_OK) {
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700599 err = mode_select_handle_sense(sdev, h->sense);
Chandra Seetharamanc85f8cb92008-11-05 20:06:37 -0800600 if (err == SCSI_DH_RETRY && retry_cnt--)
601 goto retry;
602 }
Moger, Babudd784ed2009-09-03 21:42:28 -0600603 if (err == SCSI_DH_OK) {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700604 h->state = RDAC_STATE_ACTIVE;
Moger, Babudd784ed2009-09-03 21:42:28 -0600605 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
606 "MODE_SELECT completed",
607 (char *) h->ctlr->array_name, h->ctlr->index);
608 }
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700609
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700610done:
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700611 list_for_each_entry_safe(qdata, tmp, &list, entry) {
612 list_del(&qdata->entry);
613 if (err == SCSI_DH_OK)
614 qdata->h->state = RDAC_STATE_ACTIVE;
615 if (qdata->callback_fn)
616 qdata->callback_fn(qdata->callback_data, err);
617 kfree(qdata);
618 }
619 return;
620}
621
622static int queue_mode_select(struct scsi_device *sdev,
623 activate_complete fn, void *data)
624{
625 struct rdac_queue_data *qdata;
626 struct rdac_controller *ctlr;
627
628 qdata = kzalloc(sizeof(*qdata), GFP_KERNEL);
629 if (!qdata)
630 return SCSI_DH_RETRY;
631
632 qdata->h = get_rdac_data(sdev);
633 qdata->callback_fn = fn;
634 qdata->callback_data = data;
635
636 ctlr = qdata->h->ctlr;
637 spin_lock(&ctlr->ms_lock);
638 list_add_tail(&qdata->entry, &ctlr->ms_head);
639 if (!ctlr->ms_queued) {
640 ctlr->ms_queued = 1;
641 ctlr->ms_sdev = sdev;
642 queue_work(kmpath_rdacd, &ctlr->ms_work);
643 }
644 spin_unlock(&ctlr->ms_lock);
645 return SCSI_DH_OK;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700646}
647
Chandra Seetharaman3ae31f62009-10-21 09:22:46 -0700648static int rdac_activate(struct scsi_device *sdev,
649 activate_complete fn, void *data)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700650{
651 struct rdac_dh_data *h = get_rdac_data(sdev);
652 int err = SCSI_DH_OK;
653
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700654 err = check_ownership(sdev, h);
655 if (err != SCSI_DH_OK)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700656 goto done;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700657
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700658 if (h->lun_state == RDAC_LUN_UNOWNED) {
659 err = queue_mode_select(sdev, fn, data);
660 if (err == SCSI_DH_OK)
661 return 0;
662 }
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700663done:
Chandra Seetharaman3ae31f62009-10-21 09:22:46 -0700664 if (fn)
665 fn(data, err);
666 return 0;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700667}
668
669static int rdac_prep_fn(struct scsi_device *sdev, struct request *req)
670{
671 struct rdac_dh_data *h = get_rdac_data(sdev);
672 int ret = BLKPREP_OK;
673
674 if (h->state != RDAC_STATE_ACTIVE) {
675 ret = BLKPREP_KILL;
676 req->cmd_flags |= REQ_QUIET;
677 }
678 return ret;
679
680}
681
682static int rdac_check_sense(struct scsi_device *sdev,
683 struct scsi_sense_hdr *sense_hdr)
684{
685 struct rdac_dh_data *h = get_rdac_data(sdev);
Moger, Babudd784ed2009-09-03 21:42:28 -0600686
687 RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, "
688 "I/O returned with sense %02x/%02x/%02x",
689 (char *) h->ctlr->array_name, h->ctlr->index,
690 sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
691
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700692 switch (sense_hdr->sense_key) {
693 case NOT_READY:
Chauhan, Vijay8f032262009-04-20 18:14:23 +0530694 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
695 /* LUN Not Ready - Logical Unit Not Ready and is in
696 * the process of becoming ready
697 * Just retry.
698 */
699 return ADD_TO_MLQUEUE;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700700 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81)
701 /* LUN Not Ready - Storage firmware incompatible
702 * Manual code synchonisation required.
703 *
704 * Nothing we can do here. Try to bypass the path.
705 */
706 return SUCCESS;
707 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1)
708 /* LUN Not Ready - Quiescense in progress
709 *
710 * Just retry and wait.
711 */
Mike Andersonc7dbb622008-08-12 12:11:57 -0700712 return ADD_TO_MLQUEUE;
Chauhan, Vijayaf50bb92009-03-17 18:51:40 +0530713 if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02)
714 /* LUN Not Ready - Quiescense in progress
715 * or has been achieved
716 * Just retry.
717 */
718 return ADD_TO_MLQUEUE;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700719 break;
720 case ILLEGAL_REQUEST:
721 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) {
722 /* Invalid Request - Current Logical Unit Ownership.
723 * Controller is not the current owner of the LUN,
724 * Fail the path, so that the other path be used.
725 */
726 h->state = RDAC_STATE_PASSIVE;
727 return SUCCESS;
728 }
729 break;
730 case UNIT_ATTENTION:
731 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
732 /*
733 * Power On, Reset, or Bus Device Reset, just retry.
734 */
Mike Andersonc7dbb622008-08-12 12:11:57 -0700735 return ADD_TO_MLQUEUE;
Chauhan, Vijayea41e412009-01-26 21:29:37 +0530736 if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02)
737 /*
738 * Quiescence in progress , just retry.
739 */
740 return ADD_TO_MLQUEUE;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700741 break;
742 }
743 /* success just means we do not care what scsi-ml does */
744 return SCSI_RETURN_NOT_HANDLED;
745}
746
Adrian Bunkf08c0762008-08-11 11:59:21 -0700747static const struct scsi_dh_devlist rdac_dev_list[] = {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700748 {"IBM", "1722"},
749 {"IBM", "1724"},
750 {"IBM", "1726"},
751 {"IBM", "1742"},
Moger, Babu6f4fdda2009-11-04 12:36:16 -0700752 {"IBM", "1745"},
753 {"IBM", "1746"},
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700754 {"IBM", "1814"},
755 {"IBM", "1815"},
756 {"IBM", "1818"},
757 {"IBM", "3526"},
758 {"SGI", "TP9400"},
759 {"SGI", "TP9500"},
760 {"SGI", "IS"},
761 {"STK", "OPENstorage D280"},
762 {"SUN", "CSM200_R"},
Charlie Brady5bab0882009-08-26 14:16:57 -0400763 {"SUN", "LCSM100_I"},
764 {"SUN", "LCSM100_S"},
765 {"SUN", "LCSM100_E"},
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700766 {"SUN", "LCSM100_F"},
Yanqing_Liu@Dell.com650849d2008-10-02 12:18:33 -0500767 {"DELL", "MD3000"},
768 {"DELL", "MD3000i"},
Yanqing_Liu@Dell.comcdf69bb2009-08-17 14:31:42 -0500769 {"DELL", "MD32xx"},
770 {"DELL", "MD32xxi"},
Yanqing_Liu@Dell.com2cf75f12010-05-19 12:31:36 -0500771 {"DELL", "MD36xxi"},
Babu Moger273c4782008-11-10 16:17:48 -0700772 {"LSI", "INF-01-00"},
773 {"ENGENIO", "INF-01-00"},
Chandra Seetharaman4dbfb542009-08-12 12:43:20 -0700774 {"STK", "FLEXLINE 380"},
775 {"SUN", "CSM100_R_FC"},
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700776 {NULL, NULL},
777};
778
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700779static int rdac_bus_attach(struct scsi_device *sdev);
780static void rdac_bus_detach(struct scsi_device *sdev);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700781
782static struct scsi_device_handler rdac_dh = {
783 .name = RDAC_NAME,
784 .module = THIS_MODULE,
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700785 .devlist = rdac_dev_list,
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700786 .prep_fn = rdac_prep_fn,
787 .check_sense = rdac_check_sense,
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700788 .attach = rdac_bus_attach,
789 .detach = rdac_bus_detach,
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700790 .activate = rdac_activate,
791};
792
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700793static int rdac_bus_attach(struct scsi_device *sdev)
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700794{
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700795 struct scsi_dh_data *scsi_dh_data;
796 struct rdac_dh_data *h;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700797 unsigned long flags;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700798 int err;
Moger, Babu15276662009-09-03 21:42:21 -0600799 char array_name[ARRAY_LABEL_LEN];
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700800
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700801 scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
802 + sizeof(*h) , GFP_KERNEL);
803 if (!scsi_dh_data) {
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700804 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700805 RDAC_NAME);
Chandra Seetharaman33af79d2008-07-16 17:35:08 -0700806 return 0;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700807 }
808
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700809 scsi_dh_data->scsi_dh = &rdac_dh;
810 h = (struct rdac_dh_data *) scsi_dh_data->buf;
811 h->lun = UNINITIALIZED_LUN;
812 h->state = RDAC_STATE_ACTIVE;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700813
Moger, Babu15276662009-09-03 21:42:21 -0600814 err = get_lun_info(sdev, h, array_name);
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700815 if (err != SCSI_DH_OK)
816 goto failed;
817
Moger, Babu15276662009-09-03 21:42:21 -0600818 err = initialize_controller(sdev, h, array_name);
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700819 if (err != SCSI_DH_OK)
820 goto failed;
821
Moger, Babu87b79a52009-09-03 21:42:15 -0600822 err = check_ownership(sdev, h);
823 if (err != SCSI_DH_OK)
824 goto clean_ctlr;
825
826 err = set_mode_select(sdev, h);
827 if (err != SCSI_DH_OK)
828 goto clean_ctlr;
829
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700830 if (!try_module_get(THIS_MODULE))
Moger, Babu87b79a52009-09-03 21:42:15 -0600831 goto clean_ctlr;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700832
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700833 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
834 sdev->scsi_dh_data = scsi_dh_data;
835 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700836
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700837 sdev_printk(KERN_NOTICE, sdev,
838 "%s: LUN %d (%s)\n",
839 RDAC_NAME, h->lun, lun_state[(int)h->lun_state]);
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700840
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700841 return 0;
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700842
Moger, Babu87b79a52009-09-03 21:42:15 -0600843clean_ctlr:
844 kref_put(&h->ctlr->kref, release_controller);
845
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700846failed:
847 kfree(scsi_dh_data);
848 sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
849 RDAC_NAME);
850 return -EINVAL;
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700851}
852
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700853static void rdac_bus_detach( struct scsi_device *sdev )
854{
855 struct scsi_dh_data *scsi_dh_data;
856 struct rdac_dh_data *h;
857 unsigned long flags;
858
859 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
860 scsi_dh_data = sdev->scsi_dh_data;
861 sdev->scsi_dh_data = NULL;
862 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
863
864 h = (struct rdac_dh_data *) scsi_dh_data->buf;
865 if (h->ctlr)
866 kref_put(&h->ctlr->kref, release_controller);
867 kfree(scsi_dh_data);
868 module_put(THIS_MODULE);
Hannes Reineckeca9f0082008-07-17 16:53:15 -0700869 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME);
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700870}
871
872
873
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700874static int __init rdac_init(void)
875{
876 int r;
877
878 r = scsi_register_device_handler(&rdac_dh);
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700879 if (r != 0) {
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700880 printk(KERN_ERR "Failed to register scsi device handler.");
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700881 goto done;
882 }
883
884 /*
885 * Create workqueue to handle mode selects for rdac
886 */
887 kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd");
888 if (!kmpath_rdacd) {
889 scsi_unregister_device_handler(&rdac_dh);
890 printk(KERN_ERR "kmpath_rdacd creation failed.\n");
891 }
892done:
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700893 return r;
894}
895
896static void __exit rdac_exit(void)
897{
Chandra Seetharaman970f3f42009-10-21 09:22:51 -0700898 destroy_workqueue(kmpath_rdacd);
Chandra Seetharamanfbd7ab32008-05-01 14:49:52 -0700899 scsi_unregister_device_handler(&rdac_dh);
900}
901
902module_init(rdac_init);
903module_exit(rdac_exit);
904
905MODULE_DESCRIPTION("Multipath LSI/Engenio RDAC driver");
906MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
907MODULE_LICENSE("GPL");