1/* 2 * Engenio/LSI RDAC SCSI Device Handler 3 * 4 * Copyright (C) 2005 Mike Christie. All rights reserved. 5 * Copyright (C) Chandra Seetharaman, IBM Corp. 2007 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 20 * 21 */ 22#include <scsi/scsi.h> 23#include <scsi/scsi_eh.h> 24#include <scsi/scsi_dh.h> 25#include <linux/workqueue.h> 26#include <linux/slab.h> 27 28#define RDAC_NAME "rdac" 29#define RDAC_RETRY_COUNT 5 30 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 2 117#define ARRAY_LABEL_LEN 31 118 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; 141 u8 index; 142 u8 array_name[ARRAY_LABEL_LEN]; 143 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; 148}; 149 150struct 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; 188 189#define RDAC_LUN_UNOWNED 0 190#define RDAC_LUN_OWNED 1 191#define RDAC_LUN_AVT 2 192 char lun_state; 193 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 202static const char *lun_state[] = 203{ 204 "unowned", 205 "owned", 206 "owned (AVT mode)", 207}; 208 209struct 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 216static LIST_HEAD(ctlr_list); 217static DEFINE_SPINLOCK(list_lock); 218static struct workqueue_struct *kmpath_rdacd; 219static void send_mode_select(struct work_struct *work); 220 221/* 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 246static 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; 258 259 rq = blk_get_request(q, rw, GFP_NOIO); 260 261 if (!rq) { 262 sdev_printk(KERN_INFO, sdev, 263 "get_rdac_req: blk_get_request failed.\n"); 264 return NULL; 265 } 266 267 if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) { 268 blk_put_request(rq); 269 sdev_printk(KERN_INFO, sdev, 270 "get_rdac_req: blk_rq_map_kern failed.\n"); 271 return NULL; 272 } 273 274 rq->cmd_type = REQ_TYPE_BLOCK_PC; 275 rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | 276 REQ_FAILFAST_DRIVER; 277 rq->retries = RDAC_RETRIES; 278 rq->timeout = RDAC_TIMEOUT; 279 280 return rq; 281} 282 283static struct request *rdac_failover_get(struct scsi_device *sdev, 284 struct rdac_dh_data *h) 285{ 286 struct request *rq; 287 struct rdac_mode_common *common; 288 unsigned data_size; 289 290 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; 301 } 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; 310 } 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]); 330 331 rq->sense = h->sense; 332 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); 333 rq->sense_len = 0; 334 335 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); 342 343 flush_workqueue(kmpath_rdacd); 344 spin_lock(&list_lock); 345 list_del(&ctlr->node); 346 spin_unlock(&list_lock); 347 kfree(ctlr); 348} 349 350static struct rdac_controller *get_controller(u8 *subsys_id, u8 *slot_id, 351 char *array_name) 352{ 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); 372 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; 379 380 kref_init(&ctlr->kref); 381 ctlr->use_ms10 = -1; 382 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); 387 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, 394 unsigned int len, struct rdac_dh_data *h) 395{ 396 struct request *rq; 397 struct request_queue *q = sdev->request_queue; 398 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); 410 411 rq->sense = h->sense; 412 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); 413 rq->sense_len = 0; 414 415 err = blk_execute_rq(q, NULL, rq, 1); 416 if (err == -EIO) 417 err = SCSI_DH_IO; 418 419 blk_put_request(rq); 420done: 421 return err; 422} 423 424static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h, 425 char *array_name) 426{ 427 int err, i; 428 struct c8_inquiry *inqp; 429 430 err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h); 431 if (err == SCSI_DH_OK) { 432 inqp = &h->inq.c8; 433 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; 438 h->lun = inqp->lun[7]; /* Uses only the last byte */ 439 440 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'; 444 } 445 return err; 446} 447 448static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h) 449{ 450 int err; 451 struct c9_inquiry *inqp; 452 453 h->lun_state = RDAC_LUN_UNOWNED; 454 h->state = RDAC_STATE_ACTIVE; 455 err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h); 456 if (err == SCSI_DH_OK) { 457 inqp = &h->inq.c9; 458 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 } 469 470 if (h->lun_state == RDAC_LUN_UNOWNED) 471 h->state = RDAC_STATE_PASSIVE; 472 473 return err; 474} 475 476static int initialize_controller(struct scsi_device *sdev, 477 struct rdac_dh_data *h, char *array_name) 478{ 479 int err; 480 struct c4_inquiry *inqp; 481 482 err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h); 483 if (err == SCSI_DH_OK) { 484 inqp = &h->inq.c4; 485 h->ctlr = get_controller(inqp->subsys_id, inqp->slot_id, 486 array_name); 487 if (!h->ctlr) 488 err = SCSI_DH_RES_TEMP_UNAVAIL; 489 } 490 return err; 491} 492 493static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h) 494{ 495 int err; 496 struct c2_inquiry *inqp; 497 498 err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h); 499 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 513static int mode_select_handle_sense(struct scsi_device *sdev, 514 unsigned char *sensebuf) 515{ 516 struct scsi_sense_hdr sense_hdr; 517 int err = SCSI_DH_IO, ret; 518 struct rdac_dh_data *h = get_rdac_data(sdev); 519 520 ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr); 521 if (!ret) 522 goto done; 523 524 switch (sense_hdr.sense_key) { 525 case NO_SENSE: 526 case ABORTED_COMMAND: 527 case UNIT_ATTENTION: 528 err = SCSI_DH_RETRY; 529 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: 545 break; 546 } 547 548 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 553done: 554 return err; 555} 556 557static void send_mode_select(struct work_struct *work) 558{ 559 struct rdac_controller *ctlr = 560 container_of(work, struct rdac_controller, ms_work); 561 struct request *rq; 562 struct scsi_device *sdev = ctlr->ms_sdev; 563 struct rdac_dh_data *h = get_rdac_data(sdev); 564 struct request_queue *q = sdev->request_queue; 565 int err, retry_cnt = RDAC_RETRY_COUNT; 566 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; 580 581retry: 582 err = SCSI_DH_RES_TEMP_UNAVAIL; 583 rq = rdac_failover_get(sdev, h); 584 if (!rq) 585 goto done; 586 587 list_for_each_entry(qdata, &list, entry) { 588 lun_table[qdata->h->lun] = 0x81; 589 } 590 591 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " 592 "%s MODE_SELECT command", 593 (char *) h->ctlr->array_name, h->ctlr->index, 594 (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying"); 595 596 err = blk_execute_rq(q, NULL, rq, 1); 597 blk_put_request(rq); 598 if (err != SCSI_DH_OK) { 599 err = mode_select_handle_sense(sdev, h->sense); 600 if (err == SCSI_DH_RETRY && retry_cnt--) 601 goto retry; 602 } 603 if (err == SCSI_DH_OK) { 604 h->state = RDAC_STATE_ACTIVE; 605 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " 606 "MODE_SELECT completed", 607 (char *) h->ctlr->array_name, h->ctlr->index); 608 } 609 610done: 611 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; 646} 647 648static int rdac_activate(struct scsi_device *sdev, 649 activate_complete fn, void *data) 650{ 651 struct rdac_dh_data *h = get_rdac_data(sdev); 652 int err = SCSI_DH_OK; 653 654 err = check_ownership(sdev, h); 655 if (err != SCSI_DH_OK) 656 goto done; 657 658 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 } 663done: 664 if (fn) 665 fn(data, err); 666 return 0; 667} 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); 686 687 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); 691 692 switch (sense_hdr->sense_key) { 693 case NOT_READY: 694 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; 700 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 */ 712 return ADD_TO_MLQUEUE; 713 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; 719 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 */ 735 return ADD_TO_MLQUEUE; 736 if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02) 737 /* 738 * Quiescence in progress , just retry. 739 */ 740 return ADD_TO_MLQUEUE; 741 break; 742 } 743 /* success just means we do not care what scsi-ml does */ 744 return SCSI_RETURN_NOT_HANDLED; 745} 746 747static const struct scsi_dh_devlist rdac_dev_list[] = { 748 {"IBM", "1722"}, 749 {"IBM", "1724"}, 750 {"IBM", "1726"}, 751 {"IBM", "1742"}, 752 {"IBM", "1745"}, 753 {"IBM", "1746"}, 754 {"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"}, 763 {"SUN", "LCSM100_I"}, 764 {"SUN", "LCSM100_S"}, 765 {"SUN", "LCSM100_E"}, 766 {"SUN", "LCSM100_F"}, 767 {"DELL", "MD3000"}, 768 {"DELL", "MD3000i"}, 769 {"DELL", "MD32xx"}, 770 {"DELL", "MD32xxi"}, 771 {"DELL", "MD36xxi"}, 772 {"LSI", "INF-01-00"}, 773 {"ENGENIO", "INF-01-00"}, 774 {"STK", "FLEXLINE 380"}, 775 {"SUN", "CSM100_R_FC"}, 776 {NULL, NULL}, 777}; 778 779static int rdac_bus_attach(struct scsi_device *sdev); 780static void rdac_bus_detach(struct scsi_device *sdev); 781 782static struct scsi_device_handler rdac_dh = { 783 .name = RDAC_NAME, 784 .module = THIS_MODULE, 785 .devlist = rdac_dev_list, 786 .prep_fn = rdac_prep_fn, 787 .check_sense = rdac_check_sense, 788 .attach = rdac_bus_attach, 789 .detach = rdac_bus_detach, 790 .activate = rdac_activate, 791}; 792 793static int rdac_bus_attach(struct scsi_device *sdev) 794{ 795 struct scsi_dh_data *scsi_dh_data; 796 struct rdac_dh_data *h; 797 unsigned long flags; 798 int err; 799 char array_name[ARRAY_LABEL_LEN]; 800 801 scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *) 802 + sizeof(*h) , GFP_KERNEL); 803 if (!scsi_dh_data) { 804 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n", 805 RDAC_NAME); 806 return 0; 807 } 808 809 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; 813 814 err = get_lun_info(sdev, h, array_name); 815 if (err != SCSI_DH_OK) 816 goto failed; 817 818 err = initialize_controller(sdev, h, array_name); 819 if (err != SCSI_DH_OK) 820 goto failed; 821 822 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; 829 830 if (!try_module_get(THIS_MODULE)) 831 goto clean_ctlr; 832 833 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); 836 837 sdev_printk(KERN_NOTICE, sdev, 838 "%s: LUN %d (%s)\n", 839 RDAC_NAME, h->lun, lun_state[(int)h->lun_state]); 840 841 return 0; 842 843clean_ctlr: 844 kref_put(&h->ctlr->kref, release_controller); 845 846failed: 847 kfree(scsi_dh_data); 848 sdev_printk(KERN_ERR, sdev, "%s: not attached\n", 849 RDAC_NAME); 850 return -EINVAL; 851} 852 853static 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); 869 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME); 870} 871 872 873 874static int __init rdac_init(void) 875{ 876 int r; 877 878 r = scsi_register_device_handler(&rdac_dh); 879 if (r != 0) { 880 printk(KERN_ERR "Failed to register scsi device handler."); 881 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: 893 return r; 894} 895 896static void __exit rdac_exit(void) 897{ 898 destroy_workqueue(kmpath_rdacd); 899 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"); 908