Chandra Seetharaman | dd172d7 | 2007-07-12 17:30:05 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Engenio/LSI RDAC DM HW 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_cmnd.h> |
| 24 | #include <scsi/scsi_eh.h> |
| 25 | |
| 26 | #define DM_MSG_PREFIX "multipath rdac" |
| 27 | |
| 28 | #include "dm.h" |
| 29 | #include "dm-hw-handler.h" |
| 30 | |
| 31 | #define RDAC_DM_HWH_NAME "rdac" |
| 32 | #define RDAC_DM_HWH_VER "0.4" |
| 33 | |
| 34 | /* |
| 35 | * LSI mode page stuff |
| 36 | * |
| 37 | * These struct definitions and the forming of the |
| 38 | * mode page were taken from the LSI RDAC 2.4 GPL'd |
| 39 | * driver, and then converted to Linux conventions. |
| 40 | */ |
| 41 | #define RDAC_QUIESCENCE_TIME 20; |
| 42 | /* |
| 43 | * Page Codes |
| 44 | */ |
| 45 | #define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c |
| 46 | |
| 47 | /* |
| 48 | * Controller modes definitions |
| 49 | */ |
| 50 | #define RDAC_MODE_TRANSFER_ALL_LUNS 0x01 |
| 51 | #define RDAC_MODE_TRANSFER_SPECIFIED_LUNS 0x02 |
| 52 | |
| 53 | /* |
| 54 | * RDAC Options field |
| 55 | */ |
| 56 | #define RDAC_FORCED_QUIESENCE 0x02 |
| 57 | |
| 58 | #define RDAC_FAILOVER_TIMEOUT (60 * HZ) |
| 59 | |
| 60 | struct rdac_mode_6_hdr { |
| 61 | u8 data_len; |
| 62 | u8 medium_type; |
| 63 | u8 device_params; |
| 64 | u8 block_desc_len; |
| 65 | }; |
| 66 | |
| 67 | struct rdac_mode_10_hdr { |
| 68 | u16 data_len; |
| 69 | u8 medium_type; |
| 70 | u8 device_params; |
| 71 | u16 reserved; |
| 72 | u16 block_desc_len; |
| 73 | }; |
| 74 | |
| 75 | struct rdac_mode_common { |
| 76 | u8 controller_serial[16]; |
| 77 | u8 alt_controller_serial[16]; |
| 78 | u8 rdac_mode[2]; |
| 79 | u8 alt_rdac_mode[2]; |
| 80 | u8 quiescence_timeout; |
| 81 | u8 rdac_options; |
| 82 | }; |
| 83 | |
| 84 | struct rdac_pg_legacy { |
| 85 | struct rdac_mode_6_hdr hdr; |
| 86 | u8 page_code; |
| 87 | u8 page_len; |
| 88 | struct rdac_mode_common common; |
| 89 | #define MODE6_MAX_LUN 32 |
| 90 | u8 lun_table[MODE6_MAX_LUN]; |
| 91 | u8 reserved2[32]; |
| 92 | u8 reserved3; |
| 93 | u8 reserved4; |
| 94 | }; |
| 95 | |
| 96 | struct rdac_pg_expanded { |
| 97 | struct rdac_mode_10_hdr hdr; |
| 98 | u8 page_code; |
| 99 | u8 subpage_code; |
| 100 | u8 page_len[2]; |
| 101 | struct rdac_mode_common common; |
| 102 | u8 lun_table[256]; |
| 103 | u8 reserved3; |
| 104 | u8 reserved4; |
| 105 | }; |
| 106 | |
| 107 | struct c9_inquiry { |
| 108 | u8 peripheral_info; |
| 109 | u8 page_code; /* 0xC9 */ |
| 110 | u8 reserved1; |
| 111 | u8 page_len; |
| 112 | u8 page_id[4]; /* "vace" */ |
| 113 | u8 avte_cvp; |
| 114 | u8 path_prio; |
| 115 | u8 reserved2[38]; |
| 116 | }; |
| 117 | |
| 118 | #define SUBSYS_ID_LEN 16 |
| 119 | #define SLOT_ID_LEN 2 |
| 120 | |
| 121 | struct c4_inquiry { |
| 122 | u8 peripheral_info; |
| 123 | u8 page_code; /* 0xC4 */ |
| 124 | u8 reserved1; |
| 125 | u8 page_len; |
| 126 | u8 page_id[4]; /* "subs" */ |
| 127 | u8 subsys_id[SUBSYS_ID_LEN]; |
| 128 | u8 revision[4]; |
| 129 | u8 slot_id[SLOT_ID_LEN]; |
| 130 | u8 reserved[2]; |
| 131 | }; |
| 132 | |
| 133 | struct rdac_controller { |
| 134 | u8 subsys_id[SUBSYS_ID_LEN]; |
| 135 | u8 slot_id[SLOT_ID_LEN]; |
| 136 | int use_10_ms; |
| 137 | struct kref kref; |
| 138 | struct list_head node; /* list of all controllers */ |
| 139 | spinlock_t lock; |
| 140 | int submitted; |
| 141 | struct list_head cmd_list; /* list of commands to be submitted */ |
| 142 | union { |
| 143 | struct rdac_pg_legacy legacy; |
| 144 | struct rdac_pg_expanded expanded; |
| 145 | } mode_select; |
| 146 | }; |
| 147 | struct c8_inquiry { |
| 148 | u8 peripheral_info; |
| 149 | u8 page_code; /* 0xC8 */ |
| 150 | u8 reserved1; |
| 151 | u8 page_len; |
| 152 | u8 page_id[4]; /* "edid" */ |
| 153 | u8 reserved2[3]; |
| 154 | u8 vol_uniq_id_len; |
| 155 | u8 vol_uniq_id[16]; |
| 156 | u8 vol_user_label_len; |
| 157 | u8 vol_user_label[60]; |
| 158 | u8 array_uniq_id_len; |
| 159 | u8 array_unique_id[16]; |
| 160 | u8 array_user_label_len; |
| 161 | u8 array_user_label[60]; |
| 162 | u8 lun[8]; |
| 163 | }; |
| 164 | |
| 165 | struct c2_inquiry { |
| 166 | u8 peripheral_info; |
| 167 | u8 page_code; /* 0xC2 */ |
| 168 | u8 reserved1; |
| 169 | u8 page_len; |
| 170 | u8 page_id[4]; /* "swr4" */ |
| 171 | u8 sw_version[3]; |
| 172 | u8 sw_date[3]; |
| 173 | u8 features_enabled; |
| 174 | u8 max_lun_supported; |
| 175 | u8 partitions[239]; /* Total allocation length should be 0xFF */ |
| 176 | }; |
| 177 | |
| 178 | struct rdac_handler { |
| 179 | struct list_head entry; /* list waiting to submit MODE SELECT */ |
| 180 | unsigned timeout; |
| 181 | struct rdac_controller *ctlr; |
| 182 | #define UNINITIALIZED_LUN (1 << 8) |
| 183 | unsigned lun; |
| 184 | unsigned char sense[SCSI_SENSE_BUFFERSIZE]; |
| 185 | struct dm_path *path; |
| 186 | struct work_struct work; |
| 187 | #define SEND_C2_INQUIRY 1 |
| 188 | #define SEND_C4_INQUIRY 2 |
| 189 | #define SEND_C8_INQUIRY 3 |
| 190 | #define SEND_C9_INQUIRY 4 |
| 191 | #define SEND_MODE_SELECT 5 |
| 192 | int cmd_to_send; |
| 193 | union { |
| 194 | struct c2_inquiry c2; |
| 195 | struct c4_inquiry c4; |
| 196 | struct c8_inquiry c8; |
| 197 | struct c9_inquiry c9; |
| 198 | } inq; |
| 199 | }; |
| 200 | |
| 201 | static LIST_HEAD(ctlr_list); |
| 202 | static DEFINE_SPINLOCK(list_lock); |
| 203 | static struct workqueue_struct *rdac_wkqd; |
| 204 | |
| 205 | static inline int had_failures(struct request *req, int error) |
| 206 | { |
| 207 | return (error || host_byte(req->errors) != DID_OK || |
| 208 | msg_byte(req->errors) != COMMAND_COMPLETE); |
| 209 | } |
| 210 | |
| 211 | static void rdac_resubmit_all(struct rdac_handler *h) |
| 212 | { |
| 213 | struct rdac_controller *ctlr = h->ctlr; |
| 214 | struct rdac_handler *tmp, *h1; |
| 215 | |
| 216 | spin_lock(&ctlr->lock); |
| 217 | list_for_each_entry_safe(h1, tmp, &ctlr->cmd_list, entry) { |
| 218 | h1->cmd_to_send = SEND_C9_INQUIRY; |
| 219 | queue_work(rdac_wkqd, &h1->work); |
| 220 | list_del(&h1->entry); |
| 221 | } |
| 222 | ctlr->submitted = 0; |
| 223 | spin_unlock(&ctlr->lock); |
| 224 | } |
| 225 | |
| 226 | static void mode_select_endio(struct request *req, int error) |
| 227 | { |
| 228 | struct rdac_handler *h = req->end_io_data; |
| 229 | struct scsi_sense_hdr sense_hdr; |
| 230 | int sense = 0, fail = 0; |
| 231 | |
| 232 | if (had_failures(req, error)) { |
| 233 | fail = 1; |
| 234 | goto failed; |
| 235 | } |
| 236 | |
| 237 | if (status_byte(req->errors) == CHECK_CONDITION) { |
| 238 | scsi_normalize_sense(req->sense, SCSI_SENSE_BUFFERSIZE, |
| 239 | &sense_hdr); |
| 240 | sense = (sense_hdr.sense_key << 16) | (sense_hdr.asc << 8) | |
| 241 | sense_hdr.ascq; |
| 242 | /* If it is retryable failure, submit the c9 inquiry again */ |
| 243 | if (sense == 0x59136 || sense == 0x68b02 || sense == 0xb8b02 || |
| 244 | sense == 0x62900) { |
| 245 | /* 0x59136 - Command lock contention |
| 246 | * 0x[6b]8b02 - Quiesense in progress or achieved |
| 247 | * 0x62900 - Power On, Reset, or Bus Device Reset |
| 248 | */ |
| 249 | h->cmd_to_send = SEND_C9_INQUIRY; |
| 250 | queue_work(rdac_wkqd, &h->work); |
| 251 | goto done; |
| 252 | } |
| 253 | if (sense) |
| 254 | DMINFO("MODE_SELECT failed on %s with sense 0x%x", |
| 255 | h->path->dev->name, sense); |
| 256 | } |
| 257 | failed: |
| 258 | if (fail || sense) |
| 259 | dm_pg_init_complete(h->path, MP_FAIL_PATH); |
| 260 | else |
| 261 | dm_pg_init_complete(h->path, 0); |
| 262 | |
| 263 | done: |
| 264 | rdac_resubmit_all(h); |
| 265 | __blk_put_request(req->q, req); |
| 266 | } |
| 267 | |
| 268 | static struct request *get_rdac_req(struct rdac_handler *h, |
| 269 | void *buffer, unsigned buflen, int rw) |
| 270 | { |
| 271 | struct request *rq; |
| 272 | struct request_queue *q = bdev_get_queue(h->path->dev->bdev); |
| 273 | |
| 274 | rq = blk_get_request(q, rw, GFP_KERNEL); |
| 275 | |
| 276 | if (!rq) { |
| 277 | DMINFO("get_rdac_req: blk_get_request failed"); |
| 278 | return NULL; |
| 279 | } |
| 280 | |
| 281 | if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_KERNEL)) { |
| 282 | blk_put_request(rq); |
| 283 | DMINFO("get_rdac_req: blk_rq_map_kern failed"); |
| 284 | return NULL; |
| 285 | } |
| 286 | |
Chandra Seetharaman | dd172d7 | 2007-07-12 17:30:05 +0100 | [diff] [blame] | 287 | rq->sense = h->sense; |
| 288 | memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); |
| 289 | rq->sense_len = 0; |
| 290 | |
| 291 | rq->end_io_data = h; |
| 292 | rq->timeout = h->timeout; |
| 293 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
Andrew Vasquez | f99ba18 | 2007-08-27 15:25:01 -0700 | [diff] [blame] | 294 | rq->cmd_flags |= REQ_FAILFAST | REQ_NOMERGE; |
Chandra Seetharaman | dd172d7 | 2007-07-12 17:30:05 +0100 | [diff] [blame] | 295 | return rq; |
| 296 | } |
| 297 | |
| 298 | static struct request *rdac_failover_get(struct rdac_handler *h) |
| 299 | { |
| 300 | struct request *rq; |
| 301 | struct rdac_mode_common *common; |
| 302 | unsigned data_size; |
| 303 | |
| 304 | if (h->ctlr->use_10_ms) { |
| 305 | struct rdac_pg_expanded *rdac_pg; |
| 306 | |
| 307 | data_size = sizeof(struct rdac_pg_expanded); |
| 308 | rdac_pg = &h->ctlr->mode_select.expanded; |
| 309 | memset(rdac_pg, 0, data_size); |
| 310 | common = &rdac_pg->common; |
| 311 | rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40; |
| 312 | rdac_pg->subpage_code = 0x1; |
| 313 | rdac_pg->page_len[0] = 0x01; |
| 314 | rdac_pg->page_len[1] = 0x28; |
| 315 | rdac_pg->lun_table[h->lun] = 0x81; |
| 316 | } else { |
| 317 | struct rdac_pg_legacy *rdac_pg; |
| 318 | |
| 319 | data_size = sizeof(struct rdac_pg_legacy); |
| 320 | rdac_pg = &h->ctlr->mode_select.legacy; |
| 321 | memset(rdac_pg, 0, data_size); |
| 322 | common = &rdac_pg->common; |
| 323 | rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER; |
| 324 | rdac_pg->page_len = 0x68; |
| 325 | rdac_pg->lun_table[h->lun] = 0x81; |
| 326 | } |
| 327 | common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS; |
| 328 | common->quiescence_timeout = RDAC_QUIESCENCE_TIME; |
| 329 | common->rdac_options = RDAC_FORCED_QUIESENCE; |
| 330 | |
| 331 | /* get request for block layer packet command */ |
| 332 | rq = get_rdac_req(h, &h->ctlr->mode_select, data_size, WRITE); |
| 333 | if (!rq) { |
| 334 | DMERR("rdac_failover_get: no rq"); |
| 335 | return NULL; |
| 336 | } |
| 337 | |
| 338 | /* Prepare the command. */ |
| 339 | if (h->ctlr->use_10_ms) { |
| 340 | rq->cmd[0] = MODE_SELECT_10; |
| 341 | rq->cmd[7] = data_size >> 8; |
| 342 | rq->cmd[8] = data_size & 0xff; |
| 343 | } else { |
| 344 | rq->cmd[0] = MODE_SELECT; |
| 345 | rq->cmd[4] = data_size; |
| 346 | } |
| 347 | rq->cmd_len = COMMAND_SIZE(rq->cmd[0]); |
| 348 | |
| 349 | return rq; |
| 350 | } |
| 351 | |
| 352 | /* Acquires h->ctlr->lock */ |
| 353 | static void submit_mode_select(struct rdac_handler *h) |
| 354 | { |
| 355 | struct request *rq; |
| 356 | struct request_queue *q = bdev_get_queue(h->path->dev->bdev); |
| 357 | |
| 358 | spin_lock(&h->ctlr->lock); |
| 359 | if (h->ctlr->submitted) { |
| 360 | list_add(&h->entry, &h->ctlr->cmd_list); |
| 361 | goto drop_lock; |
| 362 | } |
| 363 | |
| 364 | if (!q) { |
| 365 | DMINFO("submit_mode_select: no queue"); |
| 366 | goto fail_path; |
| 367 | } |
| 368 | |
| 369 | rq = rdac_failover_get(h); |
| 370 | if (!rq) { |
| 371 | DMERR("submit_mode_select: no rq"); |
| 372 | goto fail_path; |
| 373 | } |
| 374 | |
| 375 | DMINFO("queueing MODE_SELECT command on %s", h->path->dev->name); |
| 376 | |
| 377 | blk_execute_rq_nowait(q, NULL, rq, 1, mode_select_endio); |
| 378 | h->ctlr->submitted = 1; |
| 379 | goto drop_lock; |
| 380 | fail_path: |
| 381 | dm_pg_init_complete(h->path, MP_FAIL_PATH); |
| 382 | drop_lock: |
| 383 | spin_unlock(&h->ctlr->lock); |
| 384 | } |
| 385 | |
| 386 | static void release_ctlr(struct kref *kref) |
| 387 | { |
| 388 | struct rdac_controller *ctlr; |
| 389 | ctlr = container_of(kref, struct rdac_controller, kref); |
| 390 | |
| 391 | spin_lock(&list_lock); |
| 392 | list_del(&ctlr->node); |
| 393 | spin_unlock(&list_lock); |
| 394 | kfree(ctlr); |
| 395 | } |
| 396 | |
| 397 | static struct rdac_controller *get_controller(u8 *subsys_id, u8 *slot_id) |
| 398 | { |
| 399 | struct rdac_controller *ctlr, *tmp; |
| 400 | |
| 401 | spin_lock(&list_lock); |
| 402 | |
| 403 | list_for_each_entry(tmp, &ctlr_list, node) { |
| 404 | if ((memcmp(tmp->subsys_id, subsys_id, SUBSYS_ID_LEN) == 0) && |
| 405 | (memcmp(tmp->slot_id, slot_id, SLOT_ID_LEN) == 0)) { |
| 406 | kref_get(&tmp->kref); |
| 407 | spin_unlock(&list_lock); |
| 408 | return tmp; |
| 409 | } |
| 410 | } |
| 411 | ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC); |
| 412 | if (!ctlr) |
| 413 | goto done; |
| 414 | |
| 415 | /* initialize fields of controller */ |
| 416 | memcpy(ctlr->subsys_id, subsys_id, SUBSYS_ID_LEN); |
| 417 | memcpy(ctlr->slot_id, slot_id, SLOT_ID_LEN); |
| 418 | kref_init(&ctlr->kref); |
| 419 | spin_lock_init(&ctlr->lock); |
| 420 | ctlr->submitted = 0; |
| 421 | ctlr->use_10_ms = -1; |
| 422 | INIT_LIST_HEAD(&ctlr->cmd_list); |
| 423 | list_add(&ctlr->node, &ctlr_list); |
| 424 | done: |
| 425 | spin_unlock(&list_lock); |
| 426 | return ctlr; |
| 427 | } |
| 428 | |
| 429 | static void c4_endio(struct request *req, int error) |
| 430 | { |
| 431 | struct rdac_handler *h = req->end_io_data; |
| 432 | struct c4_inquiry *sp; |
| 433 | |
| 434 | if (had_failures(req, error)) { |
| 435 | dm_pg_init_complete(h->path, MP_FAIL_PATH); |
| 436 | goto done; |
| 437 | } |
| 438 | |
| 439 | sp = &h->inq.c4; |
| 440 | |
| 441 | h->ctlr = get_controller(sp->subsys_id, sp->slot_id); |
| 442 | |
| 443 | if (h->ctlr) { |
| 444 | h->cmd_to_send = SEND_C9_INQUIRY; |
| 445 | queue_work(rdac_wkqd, &h->work); |
| 446 | } else |
| 447 | dm_pg_init_complete(h->path, MP_FAIL_PATH); |
| 448 | done: |
| 449 | __blk_put_request(req->q, req); |
| 450 | } |
| 451 | |
| 452 | static void c2_endio(struct request *req, int error) |
| 453 | { |
| 454 | struct rdac_handler *h = req->end_io_data; |
| 455 | struct c2_inquiry *sp; |
| 456 | |
| 457 | if (had_failures(req, error)) { |
| 458 | dm_pg_init_complete(h->path, MP_FAIL_PATH); |
| 459 | goto done; |
| 460 | } |
| 461 | |
| 462 | sp = &h->inq.c2; |
| 463 | |
| 464 | /* If more than MODE6_MAX_LUN luns are supported, use mode select 10 */ |
| 465 | if (sp->max_lun_supported >= MODE6_MAX_LUN) |
| 466 | h->ctlr->use_10_ms = 1; |
| 467 | else |
| 468 | h->ctlr->use_10_ms = 0; |
| 469 | |
| 470 | h->cmd_to_send = SEND_MODE_SELECT; |
| 471 | queue_work(rdac_wkqd, &h->work); |
| 472 | done: |
| 473 | __blk_put_request(req->q, req); |
| 474 | } |
| 475 | |
| 476 | static void c9_endio(struct request *req, int error) |
| 477 | { |
| 478 | struct rdac_handler *h = req->end_io_data; |
| 479 | struct c9_inquiry *sp; |
| 480 | |
| 481 | if (had_failures(req, error)) { |
| 482 | dm_pg_init_complete(h->path, MP_FAIL_PATH); |
| 483 | goto done; |
| 484 | } |
| 485 | |
| 486 | /* We need to look at the sense keys here to take clear action. |
| 487 | * For now simple logic: If the host is in AVT mode or if controller |
| 488 | * owns the lun, return dm_pg_init_complete(), otherwise submit |
| 489 | * MODE SELECT. |
| 490 | */ |
| 491 | sp = &h->inq.c9; |
| 492 | |
| 493 | /* If in AVT mode, return success */ |
| 494 | if ((sp->avte_cvp >> 7) == 0x1) { |
| 495 | dm_pg_init_complete(h->path, 0); |
| 496 | goto done; |
| 497 | } |
| 498 | |
| 499 | /* If the controller on this path owns the LUN, return success */ |
| 500 | if (sp->avte_cvp & 0x1) { |
| 501 | dm_pg_init_complete(h->path, 0); |
| 502 | goto done; |
| 503 | } |
| 504 | |
| 505 | if (h->ctlr) { |
| 506 | if (h->ctlr->use_10_ms == -1) |
| 507 | h->cmd_to_send = SEND_C2_INQUIRY; |
| 508 | else |
| 509 | h->cmd_to_send = SEND_MODE_SELECT; |
| 510 | } else |
| 511 | h->cmd_to_send = SEND_C4_INQUIRY; |
| 512 | queue_work(rdac_wkqd, &h->work); |
| 513 | done: |
| 514 | __blk_put_request(req->q, req); |
| 515 | } |
| 516 | |
| 517 | static void c8_endio(struct request *req, int error) |
| 518 | { |
| 519 | struct rdac_handler *h = req->end_io_data; |
| 520 | struct c8_inquiry *sp; |
| 521 | |
| 522 | if (had_failures(req, error)) { |
| 523 | dm_pg_init_complete(h->path, MP_FAIL_PATH); |
| 524 | goto done; |
| 525 | } |
| 526 | |
| 527 | /* We need to look at the sense keys here to take clear action. |
| 528 | * For now simple logic: Get the lun from the inquiry page. |
| 529 | */ |
| 530 | sp = &h->inq.c8; |
| 531 | h->lun = sp->lun[7]; /* currently it uses only one byte */ |
| 532 | h->cmd_to_send = SEND_C9_INQUIRY; |
| 533 | queue_work(rdac_wkqd, &h->work); |
| 534 | done: |
| 535 | __blk_put_request(req->q, req); |
| 536 | } |
| 537 | |
| 538 | static void submit_inquiry(struct rdac_handler *h, int page_code, |
| 539 | unsigned int len, rq_end_io_fn endio) |
| 540 | { |
| 541 | struct request *rq; |
| 542 | struct request_queue *q = bdev_get_queue(h->path->dev->bdev); |
| 543 | |
| 544 | if (!q) |
| 545 | goto fail_path; |
| 546 | |
| 547 | rq = get_rdac_req(h, &h->inq, len, READ); |
| 548 | if (!rq) |
| 549 | goto fail_path; |
| 550 | |
| 551 | /* Prepare the command. */ |
| 552 | rq->cmd[0] = INQUIRY; |
| 553 | rq->cmd[1] = 1; |
| 554 | rq->cmd[2] = page_code; |
| 555 | rq->cmd[4] = len; |
| 556 | rq->cmd_len = COMMAND_SIZE(INQUIRY); |
| 557 | blk_execute_rq_nowait(q, NULL, rq, 1, endio); |
| 558 | return; |
| 559 | |
| 560 | fail_path: |
| 561 | dm_pg_init_complete(h->path, MP_FAIL_PATH); |
| 562 | } |
| 563 | |
| 564 | static void service_wkq(struct work_struct *work) |
| 565 | { |
| 566 | struct rdac_handler *h = container_of(work, struct rdac_handler, work); |
| 567 | |
| 568 | switch (h->cmd_to_send) { |
| 569 | case SEND_C2_INQUIRY: |
| 570 | submit_inquiry(h, 0xC2, sizeof(struct c2_inquiry), c2_endio); |
| 571 | break; |
| 572 | case SEND_C4_INQUIRY: |
| 573 | submit_inquiry(h, 0xC4, sizeof(struct c4_inquiry), c4_endio); |
| 574 | break; |
| 575 | case SEND_C8_INQUIRY: |
| 576 | submit_inquiry(h, 0xC8, sizeof(struct c8_inquiry), c8_endio); |
| 577 | break; |
| 578 | case SEND_C9_INQUIRY: |
| 579 | submit_inquiry(h, 0xC9, sizeof(struct c9_inquiry), c9_endio); |
| 580 | break; |
| 581 | case SEND_MODE_SELECT: |
| 582 | submit_mode_select(h); |
| 583 | break; |
| 584 | default: |
| 585 | BUG(); |
| 586 | } |
| 587 | } |
| 588 | /* |
| 589 | * only support subpage2c until we confirm that this is just a matter of |
| 590 | * of updating firmware or not, and RDAC (basic AVT works already) for now |
| 591 | * but we can add these in in when we get time and testers |
| 592 | */ |
| 593 | static int rdac_create(struct hw_handler *hwh, unsigned argc, char **argv) |
| 594 | { |
| 595 | struct rdac_handler *h; |
| 596 | unsigned timeout; |
| 597 | |
| 598 | if (argc == 0) { |
| 599 | /* No arguments: use defaults */ |
| 600 | timeout = RDAC_FAILOVER_TIMEOUT; |
| 601 | } else if (argc != 1) { |
| 602 | DMWARN("incorrect number of arguments"); |
| 603 | return -EINVAL; |
| 604 | } else { |
| 605 | if (sscanf(argv[1], "%u", &timeout) != 1) { |
| 606 | DMWARN("invalid timeout value"); |
| 607 | return -EINVAL; |
| 608 | } |
| 609 | } |
| 610 | |
| 611 | h = kzalloc(sizeof(*h), GFP_KERNEL); |
| 612 | if (!h) |
| 613 | return -ENOMEM; |
| 614 | |
| 615 | hwh->context = h; |
| 616 | h->timeout = timeout; |
| 617 | h->lun = UNINITIALIZED_LUN; |
| 618 | INIT_WORK(&h->work, service_wkq); |
| 619 | DMWARN("using RDAC command with timeout %u", h->timeout); |
| 620 | |
| 621 | return 0; |
| 622 | } |
| 623 | |
| 624 | static void rdac_destroy(struct hw_handler *hwh) |
| 625 | { |
| 626 | struct rdac_handler *h = hwh->context; |
| 627 | |
| 628 | if (h->ctlr) |
| 629 | kref_put(&h->ctlr->kref, release_ctlr); |
| 630 | kfree(h); |
| 631 | hwh->context = NULL; |
| 632 | } |
| 633 | |
| 634 | static unsigned rdac_error(struct hw_handler *hwh, struct bio *bio) |
| 635 | { |
| 636 | /* Try default handler */ |
| 637 | return dm_scsi_err_handler(hwh, bio); |
| 638 | } |
| 639 | |
| 640 | static void rdac_pg_init(struct hw_handler *hwh, unsigned bypassed, |
| 641 | struct dm_path *path) |
| 642 | { |
| 643 | struct rdac_handler *h = hwh->context; |
| 644 | |
| 645 | h->path = path; |
| 646 | switch (h->lun) { |
| 647 | case UNINITIALIZED_LUN: |
| 648 | submit_inquiry(h, 0xC8, sizeof(struct c8_inquiry), c8_endio); |
| 649 | break; |
| 650 | default: |
| 651 | submit_inquiry(h, 0xC9, sizeof(struct c9_inquiry), c9_endio); |
| 652 | } |
| 653 | } |
| 654 | |
| 655 | static struct hw_handler_type rdac_handler = { |
| 656 | .name = RDAC_DM_HWH_NAME, |
| 657 | .module = THIS_MODULE, |
| 658 | .create = rdac_create, |
| 659 | .destroy = rdac_destroy, |
| 660 | .pg_init = rdac_pg_init, |
| 661 | .error = rdac_error, |
| 662 | }; |
| 663 | |
| 664 | static int __init rdac_init(void) |
| 665 | { |
Bryn M. Reeves | c7ac86d | 2007-10-19 22:29:32 +0100 | [diff] [blame] | 666 | int r; |
Chandra Seetharaman | dd172d7 | 2007-07-12 17:30:05 +0100 | [diff] [blame] | 667 | |
| 668 | rdac_wkqd = create_singlethread_workqueue("rdac_wkqd"); |
| 669 | if (!rdac_wkqd) { |
| 670 | DMERR("Failed to create workqueue rdac_wkqd."); |
Chandra Seetharaman | dd172d7 | 2007-07-12 17:30:05 +0100 | [diff] [blame] | 671 | return -ENOMEM; |
| 672 | } |
| 673 | |
Bryn M. Reeves | c7ac86d | 2007-10-19 22:29:32 +0100 | [diff] [blame] | 674 | r = dm_register_hw_handler(&rdac_handler); |
| 675 | if (r < 0) { |
| 676 | DMERR("%s: register failed %d", RDAC_DM_HWH_NAME, r); |
| 677 | destroy_workqueue(rdac_wkqd); |
| 678 | return r; |
| 679 | } |
| 680 | |
Chandra Seetharaman | dd172d7 | 2007-07-12 17:30:05 +0100 | [diff] [blame] | 681 | DMINFO("%s: version %s loaded", RDAC_DM_HWH_NAME, RDAC_DM_HWH_VER); |
| 682 | return 0; |
| 683 | } |
| 684 | |
| 685 | static void __exit rdac_exit(void) |
| 686 | { |
| 687 | int r = dm_unregister_hw_handler(&rdac_handler); |
| 688 | |
| 689 | destroy_workqueue(rdac_wkqd); |
| 690 | if (r < 0) |
| 691 | DMERR("%s: unregister failed %d", RDAC_DM_HWH_NAME, r); |
| 692 | } |
| 693 | |
| 694 | module_init(rdac_init); |
| 695 | module_exit(rdac_exit); |
| 696 | |
| 697 | MODULE_DESCRIPTION("DM Multipath LSI/Engenio RDAC support"); |
| 698 | MODULE_AUTHOR("Mike Christie, Chandra Seetharaman"); |
| 699 | MODULE_LICENSE("GPL"); |
| 700 | MODULE_VERSION(RDAC_DM_HWH_VER); |