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 26 #define RDAC_NAME "rdac" 27 #define RDAC_RETRY_COUNT 5 28 29 /* 30 * LSI mode page stuff 31 * 32 * These struct definitions and the forming of the 33 * mode page were taken from the LSI RDAC 2.4 GPL'd 34 * driver, and then converted to Linux conventions. 35 */ 36 #define RDAC_QUIESCENCE_TIME 20; 37 /* 38 * Page Codes 39 */ 40 #define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c 41 42 /* 43 * Controller modes definitions 44 */ 45 #define RDAC_MODE_TRANSFER_SPECIFIED_LUNS 0x02 46 47 /* 48 * RDAC Options field 49 */ 50 #define RDAC_FORCED_QUIESENCE 0x02 51 52 #define RDAC_TIMEOUT (60 * HZ) 53 #define RDAC_RETRIES 3 54 55 struct rdac_mode_6_hdr { 56 u8 data_len; 57 u8 medium_type; 58 u8 device_params; 59 u8 block_desc_len; 60 }; 61 62 struct rdac_mode_10_hdr { 63 u16 data_len; 64 u8 medium_type; 65 u8 device_params; 66 u16 reserved; 67 u16 block_desc_len; 68 }; 69 70 struct rdac_mode_common { 71 u8 controller_serial[16]; 72 u8 alt_controller_serial[16]; 73 u8 rdac_mode[2]; 74 u8 alt_rdac_mode[2]; 75 u8 quiescence_timeout; 76 u8 rdac_options; 77 }; 78 79 struct rdac_pg_legacy { 80 struct rdac_mode_6_hdr hdr; 81 u8 page_code; 82 u8 page_len; 83 struct rdac_mode_common common; 84 #define MODE6_MAX_LUN 32 85 u8 lun_table[MODE6_MAX_LUN]; 86 u8 reserved2[32]; 87 u8 reserved3; 88 u8 reserved4; 89 }; 90 91 struct rdac_pg_expanded { 92 struct rdac_mode_10_hdr hdr; 93 u8 page_code; 94 u8 subpage_code; 95 u8 page_len[2]; 96 struct rdac_mode_common common; 97 u8 lun_table[256]; 98 u8 reserved3; 99 u8 reserved4; 100 }; 101 102 struct c9_inquiry { 103 u8 peripheral_info; 104 u8 page_code; /* 0xC9 */ 105 u8 reserved1; 106 u8 page_len; 107 u8 page_id[4]; /* "vace" */ 108 u8 avte_cvp; 109 u8 path_prio; 110 u8 reserved2[38]; 111 }; 112 113 #define SUBSYS_ID_LEN 16 114 #define SLOT_ID_LEN 2 115 #define ARRAY_LABEL_LEN 31 116 117 struct c4_inquiry { 118 u8 peripheral_info; 119 u8 page_code; /* 0xC4 */ 120 u8 reserved1; 121 u8 page_len; 122 u8 page_id[4]; /* "subs" */ 123 u8 subsys_id[SUBSYS_ID_LEN]; 124 u8 revision[4]; 125 u8 slot_id[SLOT_ID_LEN]; 126 u8 reserved[2]; 127 }; 128 129 struct rdac_controller { 130 u8 subsys_id[SUBSYS_ID_LEN]; 131 u8 slot_id[SLOT_ID_LEN]; 132 int use_ms10; 133 struct kref kref; 134 struct list_head node; /* list of all controllers */ 135 union { 136 struct rdac_pg_legacy legacy; 137 struct rdac_pg_expanded expanded; 138 } mode_select; 139 u8 index; 140 u8 array_name[ARRAY_LABEL_LEN]; 141 }; 142 struct c8_inquiry { 143 u8 peripheral_info; 144 u8 page_code; /* 0xC8 */ 145 u8 reserved1; 146 u8 page_len; 147 u8 page_id[4]; /* "edid" */ 148 u8 reserved2[3]; 149 u8 vol_uniq_id_len; 150 u8 vol_uniq_id[16]; 151 u8 vol_user_label_len; 152 u8 vol_user_label[60]; 153 u8 array_uniq_id_len; 154 u8 array_unique_id[16]; 155 u8 array_user_label_len; 156 u8 array_user_label[60]; 157 u8 lun[8]; 158 }; 159 160 struct c2_inquiry { 161 u8 peripheral_info; 162 u8 page_code; /* 0xC2 */ 163 u8 reserved1; 164 u8 page_len; 165 u8 page_id[4]; /* "swr4" */ 166 u8 sw_version[3]; 167 u8 sw_date[3]; 168 u8 features_enabled; 169 u8 max_lun_supported; 170 u8 partitions[239]; /* Total allocation length should be 0xFF */ 171 }; 172 173 struct rdac_dh_data { 174 struct rdac_controller *ctlr; 175 #define UNINITIALIZED_LUN (1 << 8) 176 unsigned lun; 177 #define RDAC_STATE_ACTIVE 0 178 #define RDAC_STATE_PASSIVE 1 179 unsigned char state; 180 181 #define RDAC_LUN_UNOWNED 0 182 #define RDAC_LUN_OWNED 1 183 #define RDAC_LUN_AVT 2 184 char lun_state; 185 unsigned char sense[SCSI_SENSE_BUFFERSIZE]; 186 union { 187 struct c2_inquiry c2; 188 struct c4_inquiry c4; 189 struct c8_inquiry c8; 190 struct c9_inquiry c9; 191 } inq; 192 }; 193 194 static const char *lun_state[] = 195 { 196 "unowned", 197 "owned", 198 "owned (AVT mode)", 199 }; 200 201 static LIST_HEAD(ctlr_list); 202 static DEFINE_SPINLOCK(list_lock); 203 204 /* 205 * module parameter to enable rdac debug logging. 206 * 2 bits for each type of logging, only two types defined for now 207 * Can be enhanced if required at later point 208 */ 209 static int rdac_logging = 1; 210 module_param(rdac_logging, int, S_IRUGO|S_IWUSR); 211 MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, " 212 "Default is 1 - failover logging enabled, " 213 "set it to 0xF to enable all the logs"); 214 215 #define RDAC_LOG_FAILOVER 0 216 #define RDAC_LOG_SENSE 2 217 218 #define RDAC_LOG_BITS 2 219 220 #define RDAC_LOG_LEVEL(SHIFT) \ 221 ((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1)) 222 223 #define RDAC_LOG(SHIFT, sdev, f, arg...) \ 224 do { \ 225 if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \ 226 sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \ 227 } while (0); 228 229 static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev) 230 { 231 struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data; 232 BUG_ON(scsi_dh_data == NULL); 233 return ((struct rdac_dh_data *) scsi_dh_data->buf); 234 } 235 236 static struct request *get_rdac_req(struct scsi_device *sdev, 237 void *buffer, unsigned buflen, int rw) 238 { 239 struct request *rq; 240 struct request_queue *q = sdev->request_queue; 241 242 rq = blk_get_request(q, rw, GFP_NOIO); 243 244 if (!rq) { 245 sdev_printk(KERN_INFO, sdev, 246 "get_rdac_req: blk_get_request failed.\n"); 247 return NULL; 248 } 249 250 if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) { 251 blk_put_request(rq); 252 sdev_printk(KERN_INFO, sdev, 253 "get_rdac_req: blk_rq_map_kern failed.\n"); 254 return NULL; 255 } 256 257 rq->cmd_type = REQ_TYPE_BLOCK_PC; 258 rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | 259 REQ_FAILFAST_DRIVER; 260 rq->retries = RDAC_RETRIES; 261 rq->timeout = RDAC_TIMEOUT; 262 263 return rq; 264 } 265 266 static struct request *rdac_failover_get(struct scsi_device *sdev, 267 struct rdac_dh_data *h) 268 { 269 struct request *rq; 270 struct rdac_mode_common *common; 271 unsigned data_size; 272 273 if (h->ctlr->use_ms10) { 274 struct rdac_pg_expanded *rdac_pg; 275 276 data_size = sizeof(struct rdac_pg_expanded); 277 rdac_pg = &h->ctlr->mode_select.expanded; 278 memset(rdac_pg, 0, data_size); 279 common = &rdac_pg->common; 280 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40; 281 rdac_pg->subpage_code = 0x1; 282 rdac_pg->page_len[0] = 0x01; 283 rdac_pg->page_len[1] = 0x28; 284 rdac_pg->lun_table[h->lun] = 0x81; 285 } else { 286 struct rdac_pg_legacy *rdac_pg; 287 288 data_size = sizeof(struct rdac_pg_legacy); 289 rdac_pg = &h->ctlr->mode_select.legacy; 290 memset(rdac_pg, 0, data_size); 291 common = &rdac_pg->common; 292 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER; 293 rdac_pg->page_len = 0x68; 294 rdac_pg->lun_table[h->lun] = 0x81; 295 } 296 common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS; 297 common->quiescence_timeout = RDAC_QUIESCENCE_TIME; 298 common->rdac_options = RDAC_FORCED_QUIESENCE; 299 300 /* get request for block layer packet command */ 301 rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE); 302 if (!rq) 303 return NULL; 304 305 /* Prepare the command. */ 306 if (h->ctlr->use_ms10) { 307 rq->cmd[0] = MODE_SELECT_10; 308 rq->cmd[7] = data_size >> 8; 309 rq->cmd[8] = data_size & 0xff; 310 } else { 311 rq->cmd[0] = MODE_SELECT; 312 rq->cmd[4] = data_size; 313 } 314 rq->cmd_len = COMMAND_SIZE(rq->cmd[0]); 315 316 rq->sense = h->sense; 317 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); 318 rq->sense_len = 0; 319 320 return rq; 321 } 322 323 static void release_controller(struct kref *kref) 324 { 325 struct rdac_controller *ctlr; 326 ctlr = container_of(kref, struct rdac_controller, kref); 327 328 spin_lock(&list_lock); 329 list_del(&ctlr->node); 330 spin_unlock(&list_lock); 331 kfree(ctlr); 332 } 333 334 static struct rdac_controller *get_controller(u8 *subsys_id, u8 *slot_id, 335 char *array_name) 336 { 337 struct rdac_controller *ctlr, *tmp; 338 339 spin_lock(&list_lock); 340 341 list_for_each_entry(tmp, &ctlr_list, node) { 342 if ((memcmp(tmp->subsys_id, subsys_id, SUBSYS_ID_LEN) == 0) && 343 (memcmp(tmp->slot_id, slot_id, SLOT_ID_LEN) == 0)) { 344 kref_get(&tmp->kref); 345 spin_unlock(&list_lock); 346 return tmp; 347 } 348 } 349 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC); 350 if (!ctlr) 351 goto done; 352 353 /* initialize fields of controller */ 354 memcpy(ctlr->subsys_id, subsys_id, SUBSYS_ID_LEN); 355 memcpy(ctlr->slot_id, slot_id, SLOT_ID_LEN); 356 memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN); 357 358 /* update the controller index */ 359 if (slot_id[1] == 0x31) 360 ctlr->index = 0; 361 else 362 ctlr->index = 1; 363 364 kref_init(&ctlr->kref); 365 ctlr->use_ms10 = -1; 366 list_add(&ctlr->node, &ctlr_list); 367 done: 368 spin_unlock(&list_lock); 369 return ctlr; 370 } 371 372 static int submit_inquiry(struct scsi_device *sdev, int page_code, 373 unsigned int len, struct rdac_dh_data *h) 374 { 375 struct request *rq; 376 struct request_queue *q = sdev->request_queue; 377 int err = SCSI_DH_RES_TEMP_UNAVAIL; 378 379 rq = get_rdac_req(sdev, &h->inq, len, READ); 380 if (!rq) 381 goto done; 382 383 /* Prepare the command. */ 384 rq->cmd[0] = INQUIRY; 385 rq->cmd[1] = 1; 386 rq->cmd[2] = page_code; 387 rq->cmd[4] = len; 388 rq->cmd_len = COMMAND_SIZE(INQUIRY); 389 390 rq->sense = h->sense; 391 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); 392 rq->sense_len = 0; 393 394 err = blk_execute_rq(q, NULL, rq, 1); 395 if (err == -EIO) 396 err = SCSI_DH_IO; 397 398 blk_put_request(rq); 399 done: 400 return err; 401 } 402 403 static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h, 404 char *array_name) 405 { 406 int err, i; 407 struct c8_inquiry *inqp; 408 409 err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h); 410 if (err == SCSI_DH_OK) { 411 inqp = &h->inq.c8; 412 if (inqp->page_code != 0xc8) 413 return SCSI_DH_NOSYS; 414 if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' || 415 inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd') 416 return SCSI_DH_NOSYS; 417 h->lun = inqp->lun[7]; /* Uses only the last byte */ 418 419 for(i=0; i<ARRAY_LABEL_LEN-1; ++i) 420 *(array_name+i) = inqp->array_user_label[(2*i)+1]; 421 422 *(array_name+ARRAY_LABEL_LEN-1) = '\0'; 423 } 424 return err; 425 } 426 427 static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h) 428 { 429 int err; 430 struct c9_inquiry *inqp; 431 432 h->lun_state = RDAC_LUN_UNOWNED; 433 h->state = RDAC_STATE_ACTIVE; 434 err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h); 435 if (err == SCSI_DH_OK) { 436 inqp = &h->inq.c9; 437 if ((inqp->avte_cvp >> 7) == 0x1) { 438 /* LUN in AVT mode */ 439 sdev_printk(KERN_NOTICE, sdev, 440 "%s: AVT mode detected\n", 441 RDAC_NAME); 442 h->lun_state = RDAC_LUN_AVT; 443 } else if ((inqp->avte_cvp & 0x1) != 0) { 444 /* LUN was owned by the controller */ 445 h->lun_state = RDAC_LUN_OWNED; 446 } 447 } 448 449 if (h->lun_state == RDAC_LUN_UNOWNED) 450 h->state = RDAC_STATE_PASSIVE; 451 452 return err; 453 } 454 455 static int initialize_controller(struct scsi_device *sdev, 456 struct rdac_dh_data *h, char *array_name) 457 { 458 int err; 459 struct c4_inquiry *inqp; 460 461 err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h); 462 if (err == SCSI_DH_OK) { 463 inqp = &h->inq.c4; 464 h->ctlr = get_controller(inqp->subsys_id, inqp->slot_id, 465 array_name); 466 if (!h->ctlr) 467 err = SCSI_DH_RES_TEMP_UNAVAIL; 468 } 469 return err; 470 } 471 472 static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h) 473 { 474 int err; 475 struct c2_inquiry *inqp; 476 477 err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h); 478 if (err == SCSI_DH_OK) { 479 inqp = &h->inq.c2; 480 /* 481 * If more than MODE6_MAX_LUN luns are supported, use 482 * mode select 10 483 */ 484 if (inqp->max_lun_supported >= MODE6_MAX_LUN) 485 h->ctlr->use_ms10 = 1; 486 else 487 h->ctlr->use_ms10 = 0; 488 } 489 return err; 490 } 491 492 static int mode_select_handle_sense(struct scsi_device *sdev, 493 unsigned char *sensebuf) 494 { 495 struct scsi_sense_hdr sense_hdr; 496 int err = SCSI_DH_IO, ret; 497 struct rdac_dh_data *h = get_rdac_data(sdev); 498 499 ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr); 500 if (!ret) 501 goto done; 502 503 switch (sense_hdr.sense_key) { 504 case NO_SENSE: 505 case ABORTED_COMMAND: 506 case UNIT_ATTENTION: 507 err = SCSI_DH_RETRY; 508 break; 509 case NOT_READY: 510 if (sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x01) 511 /* LUN Not Ready and is in the Process of Becoming 512 * Ready 513 */ 514 err = SCSI_DH_RETRY; 515 break; 516 case ILLEGAL_REQUEST: 517 if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36) 518 /* 519 * Command Lock contention 520 */ 521 err = SCSI_DH_RETRY; 522 break; 523 default: 524 break; 525 } 526 527 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " 528 "MODE_SELECT returned with sense %02x/%02x/%02x", 529 (char *) h->ctlr->array_name, h->ctlr->index, 530 sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq); 531 532 done: 533 return err; 534 } 535 536 static int send_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h) 537 { 538 struct request *rq; 539 struct request_queue *q = sdev->request_queue; 540 int err, retry_cnt = RDAC_RETRY_COUNT; 541 542 retry: 543 err = SCSI_DH_RES_TEMP_UNAVAIL; 544 rq = rdac_failover_get(sdev, h); 545 if (!rq) 546 goto done; 547 548 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " 549 "%s MODE_SELECT command", 550 (char *) h->ctlr->array_name, h->ctlr->index, 551 (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying"); 552 553 err = blk_execute_rq(q, NULL, rq, 1); 554 blk_put_request(rq); 555 if (err != SCSI_DH_OK) { 556 err = mode_select_handle_sense(sdev, h->sense); 557 if (err == SCSI_DH_RETRY && retry_cnt--) 558 goto retry; 559 } 560 if (err == SCSI_DH_OK) { 561 h->state = RDAC_STATE_ACTIVE; 562 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " 563 "MODE_SELECT completed", 564 (char *) h->ctlr->array_name, h->ctlr->index); 565 } 566 567 done: 568 return err; 569 } 570 571 static int rdac_activate(struct scsi_device *sdev) 572 { 573 struct rdac_dh_data *h = get_rdac_data(sdev); 574 int err = SCSI_DH_OK; 575 576 err = check_ownership(sdev, h); 577 if (err != SCSI_DH_OK) 578 goto done; 579 580 if (h->lun_state == RDAC_LUN_UNOWNED) 581 err = send_mode_select(sdev, h); 582 done: 583 return err; 584 } 585 586 static int rdac_prep_fn(struct scsi_device *sdev, struct request *req) 587 { 588 struct rdac_dh_data *h = get_rdac_data(sdev); 589 int ret = BLKPREP_OK; 590 591 if (h->state != RDAC_STATE_ACTIVE) { 592 ret = BLKPREP_KILL; 593 req->cmd_flags |= REQ_QUIET; 594 } 595 return ret; 596 597 } 598 599 static int rdac_check_sense(struct scsi_device *sdev, 600 struct scsi_sense_hdr *sense_hdr) 601 { 602 struct rdac_dh_data *h = get_rdac_data(sdev); 603 604 RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, " 605 "I/O returned with sense %02x/%02x/%02x", 606 (char *) h->ctlr->array_name, h->ctlr->index, 607 sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq); 608 609 switch (sense_hdr->sense_key) { 610 case NOT_READY: 611 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01) 612 /* LUN Not Ready - Logical Unit Not Ready and is in 613 * the process of becoming ready 614 * Just retry. 615 */ 616 return ADD_TO_MLQUEUE; 617 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81) 618 /* LUN Not Ready - Storage firmware incompatible 619 * Manual code synchonisation required. 620 * 621 * Nothing we can do here. Try to bypass the path. 622 */ 623 return SUCCESS; 624 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1) 625 /* LUN Not Ready - Quiescense in progress 626 * 627 * Just retry and wait. 628 */ 629 return ADD_TO_MLQUEUE; 630 if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02) 631 /* LUN Not Ready - Quiescense in progress 632 * or has been achieved 633 * Just retry. 634 */ 635 return ADD_TO_MLQUEUE; 636 break; 637 case ILLEGAL_REQUEST: 638 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) { 639 /* Invalid Request - Current Logical Unit Ownership. 640 * Controller is not the current owner of the LUN, 641 * Fail the path, so that the other path be used. 642 */ 643 h->state = RDAC_STATE_PASSIVE; 644 return SUCCESS; 645 } 646 break; 647 case UNIT_ATTENTION: 648 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00) 649 /* 650 * Power On, Reset, or Bus Device Reset, just retry. 651 */ 652 return ADD_TO_MLQUEUE; 653 if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02) 654 /* 655 * Quiescence in progress , just retry. 656 */ 657 return ADD_TO_MLQUEUE; 658 break; 659 } 660 /* success just means we do not care what scsi-ml does */ 661 return SCSI_RETURN_NOT_HANDLED; 662 } 663 664 static const struct scsi_dh_devlist rdac_dev_list[] = { 665 {"IBM", "1722"}, 666 {"IBM", "1724"}, 667 {"IBM", "1726"}, 668 {"IBM", "1742"}, 669 {"IBM", "1814"}, 670 {"IBM", "1815"}, 671 {"IBM", "1818"}, 672 {"IBM", "3526"}, 673 {"SGI", "TP9400"}, 674 {"SGI", "TP9500"}, 675 {"SGI", "IS"}, 676 {"STK", "OPENstorage D280"}, 677 {"SUN", "CSM200_R"}, 678 {"SUN", "LCSM100_I"}, 679 {"SUN", "LCSM100_S"}, 680 {"SUN", "LCSM100_E"}, 681 {"SUN", "LCSM100_F"}, 682 {"DELL", "MD3000"}, 683 {"DELL", "MD3000i"}, 684 {"DELL", "MD32xx"}, 685 {"DELL", "MD32xxi"}, 686 {"LSI", "INF-01-00"}, 687 {"ENGENIO", "INF-01-00"}, 688 {"STK", "FLEXLINE 380"}, 689 {"SUN", "CSM100_R_FC"}, 690 {NULL, NULL}, 691 }; 692 693 static int rdac_bus_attach(struct scsi_device *sdev); 694 static void rdac_bus_detach(struct scsi_device *sdev); 695 696 static struct scsi_device_handler rdac_dh = { 697 .name = RDAC_NAME, 698 .module = THIS_MODULE, 699 .devlist = rdac_dev_list, 700 .prep_fn = rdac_prep_fn, 701 .check_sense = rdac_check_sense, 702 .attach = rdac_bus_attach, 703 .detach = rdac_bus_detach, 704 .activate = rdac_activate, 705 }; 706 707 static int rdac_bus_attach(struct scsi_device *sdev) 708 { 709 struct scsi_dh_data *scsi_dh_data; 710 struct rdac_dh_data *h; 711 unsigned long flags; 712 int err; 713 char array_name[ARRAY_LABEL_LEN]; 714 715 scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *) 716 + sizeof(*h) , GFP_KERNEL); 717 if (!scsi_dh_data) { 718 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n", 719 RDAC_NAME); 720 return 0; 721 } 722 723 scsi_dh_data->scsi_dh = &rdac_dh; 724 h = (struct rdac_dh_data *) scsi_dh_data->buf; 725 h->lun = UNINITIALIZED_LUN; 726 h->state = RDAC_STATE_ACTIVE; 727 728 err = get_lun_info(sdev, h, array_name); 729 if (err != SCSI_DH_OK) 730 goto failed; 731 732 err = initialize_controller(sdev, h, array_name); 733 if (err != SCSI_DH_OK) 734 goto failed; 735 736 err = check_ownership(sdev, h); 737 if (err != SCSI_DH_OK) 738 goto clean_ctlr; 739 740 err = set_mode_select(sdev, h); 741 if (err != SCSI_DH_OK) 742 goto clean_ctlr; 743 744 if (!try_module_get(THIS_MODULE)) 745 goto clean_ctlr; 746 747 spin_lock_irqsave(sdev->request_queue->queue_lock, flags); 748 sdev->scsi_dh_data = scsi_dh_data; 749 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); 750 751 sdev_printk(KERN_NOTICE, sdev, 752 "%s: LUN %d (%s)\n", 753 RDAC_NAME, h->lun, lun_state[(int)h->lun_state]); 754 755 return 0; 756 757 clean_ctlr: 758 kref_put(&h->ctlr->kref, release_controller); 759 760 failed: 761 kfree(scsi_dh_data); 762 sdev_printk(KERN_ERR, sdev, "%s: not attached\n", 763 RDAC_NAME); 764 return -EINVAL; 765 } 766 767 static void rdac_bus_detach( struct scsi_device *sdev ) 768 { 769 struct scsi_dh_data *scsi_dh_data; 770 struct rdac_dh_data *h; 771 unsigned long flags; 772 773 spin_lock_irqsave(sdev->request_queue->queue_lock, flags); 774 scsi_dh_data = sdev->scsi_dh_data; 775 sdev->scsi_dh_data = NULL; 776 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); 777 778 h = (struct rdac_dh_data *) scsi_dh_data->buf; 779 if (h->ctlr) 780 kref_put(&h->ctlr->kref, release_controller); 781 kfree(scsi_dh_data); 782 module_put(THIS_MODULE); 783 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME); 784 } 785 786 787 788 static int __init rdac_init(void) 789 { 790 int r; 791 792 r = scsi_register_device_handler(&rdac_dh); 793 if (r != 0) 794 printk(KERN_ERR "Failed to register scsi device handler."); 795 return r; 796 } 797 798 static void __exit rdac_exit(void) 799 { 800 scsi_unregister_device_handler(&rdac_dh); 801 } 802 803 module_init(rdac_init); 804 module_exit(rdac_exit); 805 806 MODULE_DESCRIPTION("Multipath LSI/Engenio RDAC driver"); 807 MODULE_AUTHOR("Mike Christie, Chandra Seetharaman"); 808 MODULE_LICENSE("GPL"); 809