1/* 2 * LSI/Engenio/NetApp E-Series 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#include <linux/module.h> 28 29#define RDAC_NAME "rdac" 30#define RDAC_RETRY_COUNT 5 31 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 */ 39#define RDAC_QUIESCENCE_TIME 20 40/* 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 2 118#define ARRAY_LABEL_LEN 31 119 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}; 131 132#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 151struct rdac_controller { 152 u8 array_id[UNIQUE_ID_LEN]; 153 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; 160 u8 index; 161 u8 array_name[ARRAY_LABEL_LEN]; 162 struct Scsi_Host *host; 163 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; 168}; 169 170struct c2_inquiry { 171 u8 peripheral_info; 172 u8 page_code; /* 0xC2 */ 173 u8 reserved1; 174 u8 page_len; 175 u8 page_id[4]; /* "swr4" */ 176 u8 sw_version[3]; 177 u8 sw_date[3]; 178 u8 features_enabled; 179 u8 max_lun_supported; 180 u8 partitions[239]; /* Total allocation length should be 0xFF */ 181}; 182 183struct rdac_dh_data { 184 struct scsi_dh_data dh_data; 185 struct rdac_controller *ctlr; 186#define UNINITIALIZED_LUN (1 << 8) 187 unsigned lun; 188 189#define RDAC_MODE 0 190#define RDAC_MODE_AVT 1 191#define RDAC_MODE_IOSHIP 2 192 unsigned char mode; 193 194#define RDAC_STATE_ACTIVE 0 195#define RDAC_STATE_PASSIVE 1 196 unsigned char state; 197 198#define RDAC_LUN_UNOWNED 0 199#define RDAC_LUN_OWNED 1 200 char lun_state; 201 202#define RDAC_PREFERRED 0 203#define RDAC_NON_PREFERRED 1 204 char preferred; 205 206 unsigned char sense[SCSI_SENSE_BUFFERSIZE]; 207 union { 208 struct c2_inquiry c2; 209 struct c4_inquiry c4; 210 struct c8_inquiry c8; 211 struct c9_inquiry c9; 212 } inq; 213}; 214 215static const char *mode[] = { 216 "RDAC", 217 "AVT", 218 "IOSHIP", 219}; 220static const char *lun_state[] = 221{ 222 "unowned", 223 "owned", 224}; 225 226struct rdac_queue_data { 227 struct list_head entry; 228 struct rdac_dh_data *h; 229 activate_complete callback_fn; 230 void *callback_data; 231}; 232 233static LIST_HEAD(ctlr_list); 234static DEFINE_SPINLOCK(list_lock); 235static struct workqueue_struct *kmpath_rdacd; 236static void send_mode_select(struct work_struct *work); 237 238/* 239 * module parameter to enable rdac debug logging. 240 * 2 bits for each type of logging, only two types defined for now 241 * Can be enhanced if required at later point 242 */ 243static int rdac_logging = 1; 244module_param(rdac_logging, int, S_IRUGO|S_IWUSR); 245MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, " 246 "Default is 1 - failover logging enabled, " 247 "set it to 0xF to enable all the logs"); 248 249#define RDAC_LOG_FAILOVER 0 250#define RDAC_LOG_SENSE 2 251 252#define RDAC_LOG_BITS 2 253 254#define RDAC_LOG_LEVEL(SHIFT) \ 255 ((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1)) 256 257#define RDAC_LOG(SHIFT, sdev, f, arg...) \ 258do { \ 259 if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \ 260 sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \ 261} while (0); 262 263static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev) 264{ 265 return container_of(sdev->scsi_dh_data, struct rdac_dh_data, dh_data); 266} 267 268static struct request *get_rdac_req(struct scsi_device *sdev, 269 void *buffer, unsigned buflen, int rw) 270{ 271 struct request *rq; 272 struct request_queue *q = sdev->request_queue; 273 274 rq = blk_get_request(q, rw, GFP_NOIO); 275 276 if (IS_ERR(rq)) { 277 sdev_printk(KERN_INFO, sdev, 278 "get_rdac_req: blk_get_request failed.\n"); 279 return NULL; 280 } 281 blk_rq_set_block_pc(rq); 282 283 if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) { 284 blk_put_request(rq); 285 sdev_printk(KERN_INFO, sdev, 286 "get_rdac_req: blk_rq_map_kern failed.\n"); 287 return NULL; 288 } 289 290 rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | 291 REQ_FAILFAST_DRIVER; 292 rq->retries = RDAC_RETRIES; 293 rq->timeout = RDAC_TIMEOUT; 294 295 return rq; 296} 297 298static struct request *rdac_failover_get(struct scsi_device *sdev, 299 struct rdac_dh_data *h, struct list_head *list) 300{ 301 struct request *rq; 302 struct rdac_mode_common *common; 303 unsigned data_size; 304 struct rdac_queue_data *qdata; 305 u8 *lun_table; 306 307 if (h->ctlr->use_ms10) { 308 struct rdac_pg_expanded *rdac_pg; 309 310 data_size = sizeof(struct rdac_pg_expanded); 311 rdac_pg = &h->ctlr->mode_select.expanded; 312 memset(rdac_pg, 0, data_size); 313 common = &rdac_pg->common; 314 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40; 315 rdac_pg->subpage_code = 0x1; 316 rdac_pg->page_len[0] = 0x01; 317 rdac_pg->page_len[1] = 0x28; 318 lun_table = rdac_pg->lun_table; 319 } else { 320 struct rdac_pg_legacy *rdac_pg; 321 322 data_size = sizeof(struct rdac_pg_legacy); 323 rdac_pg = &h->ctlr->mode_select.legacy; 324 memset(rdac_pg, 0, data_size); 325 common = &rdac_pg->common; 326 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER; 327 rdac_pg->page_len = 0x68; 328 lun_table = rdac_pg->lun_table; 329 } 330 common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS; 331 common->quiescence_timeout = RDAC_QUIESCENCE_TIME; 332 common->rdac_options = RDAC_FORCED_QUIESENCE; 333 334 list_for_each_entry(qdata, list, entry) { 335 lun_table[qdata->h->lun] = 0x81; 336 } 337 338 /* get request for block layer packet command */ 339 rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE); 340 if (!rq) 341 return NULL; 342 343 /* Prepare the command. */ 344 if (h->ctlr->use_ms10) { 345 rq->cmd[0] = MODE_SELECT_10; 346 rq->cmd[7] = data_size >> 8; 347 rq->cmd[8] = data_size & 0xff; 348 } else { 349 rq->cmd[0] = MODE_SELECT; 350 rq->cmd[4] = data_size; 351 } 352 rq->cmd_len = COMMAND_SIZE(rq->cmd[0]); 353 354 rq->sense = h->sense; 355 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); 356 rq->sense_len = 0; 357 358 return rq; 359} 360 361static void release_controller(struct kref *kref) 362{ 363 struct rdac_controller *ctlr; 364 ctlr = container_of(kref, struct rdac_controller, kref); 365 366 list_del(&ctlr->node); 367 kfree(ctlr); 368} 369 370static struct rdac_controller *get_controller(int index, char *array_name, 371 u8 *array_id, struct scsi_device *sdev) 372{ 373 struct rdac_controller *ctlr, *tmp; 374 375 list_for_each_entry(tmp, &ctlr_list, node) { 376 if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) && 377 (tmp->index == index) && 378 (tmp->host == sdev->host)) { 379 kref_get(&tmp->kref); 380 return tmp; 381 } 382 } 383 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC); 384 if (!ctlr) 385 return NULL; 386 387 /* initialize fields of controller */ 388 memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN); 389 ctlr->index = index; 390 ctlr->host = sdev->host; 391 memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN); 392 393 kref_init(&ctlr->kref); 394 ctlr->use_ms10 = -1; 395 ctlr->ms_queued = 0; 396 ctlr->ms_sdev = NULL; 397 spin_lock_init(&ctlr->ms_lock); 398 INIT_WORK(&ctlr->ms_work, send_mode_select); 399 INIT_LIST_HEAD(&ctlr->ms_head); 400 list_add(&ctlr->node, &ctlr_list); 401 402 return ctlr; 403} 404 405static int submit_inquiry(struct scsi_device *sdev, int page_code, 406 unsigned int len, struct rdac_dh_data *h) 407{ 408 struct request *rq; 409 struct request_queue *q = sdev->request_queue; 410 int err = SCSI_DH_RES_TEMP_UNAVAIL; 411 412 rq = get_rdac_req(sdev, &h->inq, len, READ); 413 if (!rq) 414 goto done; 415 416 /* Prepare the command. */ 417 rq->cmd[0] = INQUIRY; 418 rq->cmd[1] = 1; 419 rq->cmd[2] = page_code; 420 rq->cmd[4] = len; 421 rq->cmd_len = COMMAND_SIZE(INQUIRY); 422 423 rq->sense = h->sense; 424 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); 425 rq->sense_len = 0; 426 427 err = blk_execute_rq(q, NULL, rq, 1); 428 if (err == -EIO) 429 err = SCSI_DH_IO; 430 431 blk_put_request(rq); 432done: 433 return err; 434} 435 436static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h, 437 char *array_name, u8 *array_id) 438{ 439 int err, i; 440 struct c8_inquiry *inqp; 441 442 err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h); 443 if (err == SCSI_DH_OK) { 444 inqp = &h->inq.c8; 445 if (inqp->page_code != 0xc8) 446 return SCSI_DH_NOSYS; 447 if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' || 448 inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd') 449 return SCSI_DH_NOSYS; 450 h->lun = inqp->lun[7]; /* Uses only the last byte */ 451 452 for(i=0; i<ARRAY_LABEL_LEN-1; ++i) 453 *(array_name+i) = inqp->array_user_label[(2*i)+1]; 454 455 *(array_name+ARRAY_LABEL_LEN-1) = '\0'; 456 memset(array_id, 0, UNIQUE_ID_LEN); 457 memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len); 458 } 459 return err; 460} 461 462static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h) 463{ 464 int err; 465 struct c9_inquiry *inqp; 466 467 h->state = RDAC_STATE_ACTIVE; 468 err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h); 469 if (err == SCSI_DH_OK) { 470 inqp = &h->inq.c9; 471 /* detect the operating mode */ 472 if ((inqp->avte_cvp >> 5) & 0x1) 473 h->mode = RDAC_MODE_IOSHIP; /* LUN in IOSHIP mode */ 474 else if (inqp->avte_cvp >> 7) 475 h->mode = RDAC_MODE_AVT; /* LUN in AVT mode */ 476 else 477 h->mode = RDAC_MODE; /* LUN in RDAC mode */ 478 479 /* Update ownership */ 480 if (inqp->avte_cvp & 0x1) 481 h->lun_state = RDAC_LUN_OWNED; 482 else { 483 h->lun_state = RDAC_LUN_UNOWNED; 484 if (h->mode == RDAC_MODE) 485 h->state = RDAC_STATE_PASSIVE; 486 } 487 488 /* Update path prio*/ 489 if (inqp->path_prio & 0x1) 490 h->preferred = RDAC_PREFERRED; 491 else 492 h->preferred = RDAC_NON_PREFERRED; 493 } 494 495 return err; 496} 497 498static int initialize_controller(struct scsi_device *sdev, 499 struct rdac_dh_data *h, char *array_name, u8 *array_id) 500{ 501 int err, index; 502 struct c4_inquiry *inqp; 503 504 err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h); 505 if (err == SCSI_DH_OK) { 506 inqp = &h->inq.c4; 507 /* get the controller index */ 508 if (inqp->slot_id[1] == 0x31) 509 index = 0; 510 else 511 index = 1; 512 513 spin_lock(&list_lock); 514 h->ctlr = get_controller(index, array_name, array_id, sdev); 515 if (!h->ctlr) 516 err = SCSI_DH_RES_TEMP_UNAVAIL; 517 spin_unlock(&list_lock); 518 } 519 return err; 520} 521 522static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h) 523{ 524 int err; 525 struct c2_inquiry *inqp; 526 527 err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h); 528 if (err == SCSI_DH_OK) { 529 inqp = &h->inq.c2; 530 /* 531 * If more than MODE6_MAX_LUN luns are supported, use 532 * mode select 10 533 */ 534 if (inqp->max_lun_supported >= MODE6_MAX_LUN) 535 h->ctlr->use_ms10 = 1; 536 else 537 h->ctlr->use_ms10 = 0; 538 } 539 return err; 540} 541 542static int mode_select_handle_sense(struct scsi_device *sdev, 543 unsigned char *sensebuf) 544{ 545 struct scsi_sense_hdr sense_hdr; 546 int err = SCSI_DH_IO, ret; 547 struct rdac_dh_data *h = get_rdac_data(sdev); 548 549 ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr); 550 if (!ret) 551 goto done; 552 553 switch (sense_hdr.sense_key) { 554 case NO_SENSE: 555 case ABORTED_COMMAND: 556 case UNIT_ATTENTION: 557 err = SCSI_DH_RETRY; 558 break; 559 case NOT_READY: 560 if (sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x01) 561 /* LUN Not Ready and is in the Process of Becoming 562 * Ready 563 */ 564 err = SCSI_DH_RETRY; 565 break; 566 case ILLEGAL_REQUEST: 567 if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36) 568 /* 569 * Command Lock contention 570 */ 571 err = SCSI_DH_IMM_RETRY; 572 break; 573 default: 574 break; 575 } 576 577 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " 578 "MODE_SELECT returned with sense %02x/%02x/%02x", 579 (char *) h->ctlr->array_name, h->ctlr->index, 580 sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq); 581 582done: 583 return err; 584} 585 586static void send_mode_select(struct work_struct *work) 587{ 588 struct rdac_controller *ctlr = 589 container_of(work, struct rdac_controller, ms_work); 590 struct request *rq; 591 struct scsi_device *sdev = ctlr->ms_sdev; 592 struct rdac_dh_data *h = get_rdac_data(sdev); 593 struct request_queue *q = sdev->request_queue; 594 int err, retry_cnt = RDAC_RETRY_COUNT; 595 struct rdac_queue_data *tmp, *qdata; 596 LIST_HEAD(list); 597 598 spin_lock(&ctlr->ms_lock); 599 list_splice_init(&ctlr->ms_head, &list); 600 ctlr->ms_queued = 0; 601 ctlr->ms_sdev = NULL; 602 spin_unlock(&ctlr->ms_lock); 603 604retry: 605 err = SCSI_DH_RES_TEMP_UNAVAIL; 606 rq = rdac_failover_get(sdev, h, &list); 607 if (!rq) 608 goto done; 609 610 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " 611 "%s MODE_SELECT command", 612 (char *) h->ctlr->array_name, h->ctlr->index, 613 (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying"); 614 615 err = blk_execute_rq(q, NULL, rq, 1); 616 blk_put_request(rq); 617 if (err != SCSI_DH_OK) { 618 err = mode_select_handle_sense(sdev, h->sense); 619 if (err == SCSI_DH_RETRY && retry_cnt--) 620 goto retry; 621 if (err == SCSI_DH_IMM_RETRY) 622 goto retry; 623 } 624 if (err == SCSI_DH_OK) { 625 h->state = RDAC_STATE_ACTIVE; 626 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " 627 "MODE_SELECT completed", 628 (char *) h->ctlr->array_name, h->ctlr->index); 629 } 630 631done: 632 list_for_each_entry_safe(qdata, tmp, &list, entry) { 633 list_del(&qdata->entry); 634 if (err == SCSI_DH_OK) 635 qdata->h->state = RDAC_STATE_ACTIVE; 636 if (qdata->callback_fn) 637 qdata->callback_fn(qdata->callback_data, err); 638 kfree(qdata); 639 } 640 return; 641} 642 643static int queue_mode_select(struct scsi_device *sdev, 644 activate_complete fn, void *data) 645{ 646 struct rdac_queue_data *qdata; 647 struct rdac_controller *ctlr; 648 649 qdata = kzalloc(sizeof(*qdata), GFP_KERNEL); 650 if (!qdata) 651 return SCSI_DH_RETRY; 652 653 qdata->h = get_rdac_data(sdev); 654 qdata->callback_fn = fn; 655 qdata->callback_data = data; 656 657 ctlr = qdata->h->ctlr; 658 spin_lock(&ctlr->ms_lock); 659 list_add_tail(&qdata->entry, &ctlr->ms_head); 660 if (!ctlr->ms_queued) { 661 ctlr->ms_queued = 1; 662 ctlr->ms_sdev = sdev; 663 queue_work(kmpath_rdacd, &ctlr->ms_work); 664 } 665 spin_unlock(&ctlr->ms_lock); 666 return SCSI_DH_OK; 667} 668 669static int rdac_activate(struct scsi_device *sdev, 670 activate_complete fn, void *data) 671{ 672 struct rdac_dh_data *h = get_rdac_data(sdev); 673 int err = SCSI_DH_OK; 674 int act = 0; 675 676 err = check_ownership(sdev, h); 677 if (err != SCSI_DH_OK) 678 goto done; 679 680 switch (h->mode) { 681 case RDAC_MODE: 682 if (h->lun_state == RDAC_LUN_UNOWNED) 683 act = 1; 684 break; 685 case RDAC_MODE_IOSHIP: 686 if ((h->lun_state == RDAC_LUN_UNOWNED) && 687 (h->preferred == RDAC_PREFERRED)) 688 act = 1; 689 break; 690 default: 691 break; 692 } 693 694 if (act) { 695 err = queue_mode_select(sdev, fn, data); 696 if (err == SCSI_DH_OK) 697 return 0; 698 } 699done: 700 if (fn) 701 fn(data, err); 702 return 0; 703} 704 705static int rdac_prep_fn(struct scsi_device *sdev, struct request *req) 706{ 707 struct rdac_dh_data *h = get_rdac_data(sdev); 708 int ret = BLKPREP_OK; 709 710 if (h->state != RDAC_STATE_ACTIVE) { 711 ret = BLKPREP_KILL; 712 req->cmd_flags |= REQ_QUIET; 713 } 714 return ret; 715 716} 717 718static int rdac_check_sense(struct scsi_device *sdev, 719 struct scsi_sense_hdr *sense_hdr) 720{ 721 struct rdac_dh_data *h = get_rdac_data(sdev); 722 723 RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, " 724 "I/O returned with sense %02x/%02x/%02x", 725 (char *) h->ctlr->array_name, h->ctlr->index, 726 sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq); 727 728 switch (sense_hdr->sense_key) { 729 case NOT_READY: 730 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01) 731 /* LUN Not Ready - Logical Unit Not Ready and is in 732 * the process of becoming ready 733 * Just retry. 734 */ 735 return ADD_TO_MLQUEUE; 736 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81) 737 /* LUN Not Ready - Storage firmware incompatible 738 * Manual code synchonisation required. 739 * 740 * Nothing we can do here. Try to bypass the path. 741 */ 742 return SUCCESS; 743 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1) 744 /* LUN Not Ready - Quiescense in progress 745 * 746 * Just retry and wait. 747 */ 748 return ADD_TO_MLQUEUE; 749 if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02) 750 /* LUN Not Ready - Quiescense in progress 751 * or has been achieved 752 * Just retry. 753 */ 754 return ADD_TO_MLQUEUE; 755 break; 756 case ILLEGAL_REQUEST: 757 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) { 758 /* Invalid Request - Current Logical Unit Ownership. 759 * Controller is not the current owner of the LUN, 760 * Fail the path, so that the other path be used. 761 */ 762 h->state = RDAC_STATE_PASSIVE; 763 return SUCCESS; 764 } 765 break; 766 case UNIT_ATTENTION: 767 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00) 768 /* 769 * Power On, Reset, or Bus Device Reset, just retry. 770 */ 771 return ADD_TO_MLQUEUE; 772 if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02) 773 /* 774 * Quiescence in progress , just retry. 775 */ 776 return ADD_TO_MLQUEUE; 777 break; 778 } 779 /* success just means we do not care what scsi-ml does */ 780 return SCSI_RETURN_NOT_HANDLED; 781} 782 783static const struct { 784 char *vendor; 785 char *model; 786} rdac_dev_list[] = { 787 {"IBM", "1722"}, 788 {"IBM", "1724"}, 789 {"IBM", "1726"}, 790 {"IBM", "1742"}, 791 {"IBM", "1745"}, 792 {"IBM", "1746"}, 793 {"IBM", "1813"}, 794 {"IBM", "1814"}, 795 {"IBM", "1815"}, 796 {"IBM", "1818"}, 797 {"IBM", "3526"}, 798 {"SGI", "TP9"}, 799 {"SGI", "IS"}, 800 {"STK", "OPENstorage D280"}, 801 {"STK", "FLEXLINE 380"}, 802 {"SUN", "CSM"}, 803 {"SUN", "LCSM100"}, 804 {"SUN", "STK6580_6780"}, 805 {"SUN", "SUN_6180"}, 806 {"SUN", "ArrayStorage"}, 807 {"DELL", "MD3"}, 808 {"NETAPP", "INF-01-00"}, 809 {"LSI", "INF-01-00"}, 810 {"ENGENIO", "INF-01-00"}, 811 {NULL, NULL}, 812}; 813 814static bool rdac_match(struct scsi_device *sdev) 815{ 816 int i; 817 818 if (scsi_device_tpgs(sdev)) 819 return false; 820 821 for (i = 0; rdac_dev_list[i].vendor; i++) { 822 if (!strncmp(sdev->vendor, rdac_dev_list[i].vendor, 823 strlen(rdac_dev_list[i].vendor)) && 824 !strncmp(sdev->model, rdac_dev_list[i].model, 825 strlen(rdac_dev_list[i].model))) { 826 return true; 827 } 828 } 829 return false; 830} 831 832static struct scsi_dh_data *rdac_bus_attach(struct scsi_device *sdev) 833{ 834 struct rdac_dh_data *h; 835 int err; 836 char array_name[ARRAY_LABEL_LEN]; 837 char array_id[UNIQUE_ID_LEN]; 838 839 h = kzalloc(sizeof(*h) , GFP_KERNEL); 840 if (!h) 841 return ERR_PTR(-ENOMEM); 842 h->lun = UNINITIALIZED_LUN; 843 h->state = RDAC_STATE_ACTIVE; 844 845 err = get_lun_info(sdev, h, array_name, array_id); 846 if (err != SCSI_DH_OK) 847 goto failed; 848 849 err = initialize_controller(sdev, h, array_name, array_id); 850 if (err != SCSI_DH_OK) 851 goto failed; 852 853 err = check_ownership(sdev, h); 854 if (err != SCSI_DH_OK) 855 goto clean_ctlr; 856 857 err = set_mode_select(sdev, h); 858 if (err != SCSI_DH_OK) 859 goto clean_ctlr; 860 861 sdev_printk(KERN_NOTICE, sdev, 862 "%s: LUN %d (%s) (%s)\n", 863 RDAC_NAME, h->lun, mode[(int)h->mode], 864 lun_state[(int)h->lun_state]); 865 866 return &h->dh_data; 867 868clean_ctlr: 869 spin_lock(&list_lock); 870 kref_put(&h->ctlr->kref, release_controller); 871 spin_unlock(&list_lock); 872 873failed: 874 kfree(h); 875 return ERR_PTR(-EINVAL); 876} 877 878static void rdac_bus_detach( struct scsi_device *sdev ) 879{ 880 struct rdac_dh_data *h = get_rdac_data(sdev); 881 882 if (h->ctlr && h->ctlr->ms_queued) 883 flush_workqueue(kmpath_rdacd); 884 885 spin_lock(&list_lock); 886 if (h->ctlr) 887 kref_put(&h->ctlr->kref, release_controller); 888 spin_unlock(&list_lock); 889 kfree(h); 890} 891 892static struct scsi_device_handler rdac_dh = { 893 .name = RDAC_NAME, 894 .module = THIS_MODULE, 895 .prep_fn = rdac_prep_fn, 896 .check_sense = rdac_check_sense, 897 .attach = rdac_bus_attach, 898 .detach = rdac_bus_detach, 899 .activate = rdac_activate, 900 .match = rdac_match, 901}; 902 903static int __init rdac_init(void) 904{ 905 int r; 906 907 r = scsi_register_device_handler(&rdac_dh); 908 if (r != 0) { 909 printk(KERN_ERR "Failed to register scsi device handler."); 910 goto done; 911 } 912 913 /* 914 * Create workqueue to handle mode selects for rdac 915 */ 916 kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd"); 917 if (!kmpath_rdacd) { 918 scsi_unregister_device_handler(&rdac_dh); 919 printk(KERN_ERR "kmpath_rdacd creation failed.\n"); 920 921 r = -EINVAL; 922 } 923done: 924 return r; 925} 926 927static void __exit rdac_exit(void) 928{ 929 destroy_workqueue(kmpath_rdacd); 930 scsi_unregister_device_handler(&rdac_dh); 931} 932 933module_init(rdac_init); 934module_exit(rdac_exit); 935 936MODULE_DESCRIPTION("Multipath LSI/Engenio/NetApp E-Series RDAC driver"); 937MODULE_AUTHOR("Mike Christie, Chandra Seetharaman"); 938MODULE_VERSION("01.00.0000.0000"); 939MODULE_LICENSE("GPL"); 940