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 57 struct rdac_mode_6_hdr { 58 u8 data_len; 59 u8 medium_type; 60 u8 device_params; 61 u8 block_desc_len; 62 }; 63 64 struct 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 72 struct 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 81 struct 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 93 struct 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 }; 103 104 struct 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 31 118 119 struct 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 }; 130 131 struct 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 }; 149 150 struct 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 }; 167 168 struct 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 }; 180 181 struct rdac_dh_data { 182 struct rdac_controller *ctlr; 183 #define UNINITIALIZED_LUN (1 << 8) 184 unsigned lun; 185 186 #define RDAC_MODE 0 187 #define RDAC_MODE_AVT 1 188 #define RDAC_MODE_IOSHIP 2 189 unsigned char mode; 190 191 #define RDAC_STATE_ACTIVE 0 192 #define RDAC_STATE_PASSIVE 1 193 unsigned char state; 194 195 #define RDAC_LUN_UNOWNED 0 196 #define RDAC_LUN_OWNED 1 197 char lun_state; 198 199 #define RDAC_PREFERRED 0 200 #define RDAC_NON_PREFERRED 1 201 char preferred; 202 203 unsigned char sense[SCSI_SENSE_BUFFERSIZE]; 204 union { 205 struct c2_inquiry c2; 206 struct c4_inquiry c4; 207 struct c8_inquiry c8; 208 struct c9_inquiry c9; 209 } inq; 210 }; 211 212 static const char *mode[] = { 213 "RDAC", 214 "AVT", 215 "IOSHIP", 216 }; 217 static const char *lun_state[] = 218 { 219 "unowned", 220 "owned", 221 }; 222 223 struct rdac_queue_data { 224 struct list_head entry; 225 struct rdac_dh_data *h; 226 activate_complete callback_fn; 227 void *callback_data; 228 }; 229 230 static LIST_HEAD(ctlr_list); 231 static DEFINE_SPINLOCK(list_lock); 232 static struct workqueue_struct *kmpath_rdacd; 233 static void send_mode_select(struct work_struct *work); 234 235 /* 236 * module parameter to enable rdac debug logging. 237 * 2 bits for each type of logging, only two types defined for now 238 * Can be enhanced if required at later point 239 */ 240 static int rdac_logging = 1; 241 module_param(rdac_logging, int, S_IRUGO|S_IWUSR); 242 MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, " 243 "Default is 1 - failover logging enabled, " 244 "set it to 0xF to enable all the logs"); 245 246 #define RDAC_LOG_FAILOVER 0 247 #define RDAC_LOG_SENSE 2 248 249 #define RDAC_LOG_BITS 2 250 251 #define RDAC_LOG_LEVEL(SHIFT) \ 252 ((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1)) 253 254 #define RDAC_LOG(SHIFT, sdev, f, arg...) \ 255 do { \ 256 if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \ 257 sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \ 258 } while (0); 259 260 static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev) 261 { 262 struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data; 263 BUG_ON(scsi_dh_data == NULL); 264 return ((struct rdac_dh_data *) scsi_dh_data->buf); 265 } 266 267 static struct request *get_rdac_req(struct scsi_device *sdev, 268 void *buffer, unsigned buflen, int rw) 269 { 270 struct request *rq; 271 struct request_queue *q = sdev->request_queue; 272 273 rq = blk_get_request(q, rw, GFP_NOIO); 274 275 if (!rq) { 276 sdev_printk(KERN_INFO, sdev, 277 "get_rdac_req: blk_get_request failed.\n"); 278 return NULL; 279 } 280 281 if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) { 282 blk_put_request(rq); 283 sdev_printk(KERN_INFO, sdev, 284 "get_rdac_req: blk_rq_map_kern failed.\n"); 285 return NULL; 286 } 287 288 rq->cmd_type = REQ_TYPE_BLOCK_PC; 289 rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | 290 REQ_FAILFAST_DRIVER; 291 rq->retries = RDAC_RETRIES; 292 rq->timeout = RDAC_TIMEOUT; 293 294 return rq; 295 } 296 297 static struct request *rdac_failover_get(struct scsi_device *sdev, 298 struct rdac_dh_data *h, struct list_head *list) 299 { 300 struct request *rq; 301 struct rdac_mode_common *common; 302 unsigned data_size; 303 struct rdac_queue_data *qdata; 304 u8 *lun_table; 305 306 if (h->ctlr->use_ms10) { 307 struct rdac_pg_expanded *rdac_pg; 308 309 data_size = sizeof(struct rdac_pg_expanded); 310 rdac_pg = &h->ctlr->mode_select.expanded; 311 memset(rdac_pg, 0, data_size); 312 common = &rdac_pg->common; 313 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40; 314 rdac_pg->subpage_code = 0x1; 315 rdac_pg->page_len[0] = 0x01; 316 rdac_pg->page_len[1] = 0x28; 317 lun_table = rdac_pg->lun_table; 318 } else { 319 struct rdac_pg_legacy *rdac_pg; 320 321 data_size = sizeof(struct rdac_pg_legacy); 322 rdac_pg = &h->ctlr->mode_select.legacy; 323 memset(rdac_pg, 0, data_size); 324 common = &rdac_pg->common; 325 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER; 326 rdac_pg->page_len = 0x68; 327 lun_table = rdac_pg->lun_table; 328 } 329 common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS; 330 common->quiescence_timeout = RDAC_QUIESCENCE_TIME; 331 common->rdac_options = RDAC_FORCED_QUIESENCE; 332 333 list_for_each_entry(qdata, list, entry) { 334 lun_table[qdata->h->lun] = 0x81; 335 } 336 337 /* get request for block layer packet command */ 338 rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE); 339 if (!rq) 340 return NULL; 341 342 /* Prepare the command. */ 343 if (h->ctlr->use_ms10) { 344 rq->cmd[0] = MODE_SELECT_10; 345 rq->cmd[7] = data_size >> 8; 346 rq->cmd[8] = data_size & 0xff; 347 } else { 348 rq->cmd[0] = MODE_SELECT; 349 rq->cmd[4] = data_size; 350 } 351 rq->cmd_len = COMMAND_SIZE(rq->cmd[0]); 352 353 rq->sense = h->sense; 354 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); 355 rq->sense_len = 0; 356 357 return rq; 358 } 359 360 static void release_controller(struct kref *kref) 361 { 362 struct rdac_controller *ctlr; 363 ctlr = container_of(kref, struct rdac_controller, kref); 364 365 flush_workqueue(kmpath_rdacd); 366 spin_lock(&list_lock); 367 list_del(&ctlr->node); 368 spin_unlock(&list_lock); 369 kfree(ctlr); 370 } 371 372 static struct rdac_controller *get_controller(u8 *subsys_id, u8 *slot_id, 373 char *array_name) 374 { 375 struct rdac_controller *ctlr, *tmp; 376 377 spin_lock(&list_lock); 378 379 list_for_each_entry(tmp, &ctlr_list, node) { 380 if ((memcmp(tmp->subsys_id, subsys_id, SUBSYS_ID_LEN) == 0) && 381 (memcmp(tmp->slot_id, slot_id, SLOT_ID_LEN) == 0)) { 382 kref_get(&tmp->kref); 383 spin_unlock(&list_lock); 384 return tmp; 385 } 386 } 387 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC); 388 if (!ctlr) 389 goto done; 390 391 /* initialize fields of controller */ 392 memcpy(ctlr->subsys_id, subsys_id, SUBSYS_ID_LEN); 393 memcpy(ctlr->slot_id, slot_id, SLOT_ID_LEN); 394 memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN); 395 396 /* update the controller index */ 397 if (slot_id[1] == 0x31) 398 ctlr->index = 0; 399 else 400 ctlr->index = 1; 401 402 kref_init(&ctlr->kref); 403 ctlr->use_ms10 = -1; 404 ctlr->ms_queued = 0; 405 ctlr->ms_sdev = NULL; 406 spin_lock_init(&ctlr->ms_lock); 407 INIT_WORK(&ctlr->ms_work, send_mode_select); 408 INIT_LIST_HEAD(&ctlr->ms_head); 409 list_add(&ctlr->node, &ctlr_list); 410 done: 411 spin_unlock(&list_lock); 412 return ctlr; 413 } 414 415 static int submit_inquiry(struct scsi_device *sdev, int page_code, 416 unsigned int len, struct rdac_dh_data *h) 417 { 418 struct request *rq; 419 struct request_queue *q = sdev->request_queue; 420 int err = SCSI_DH_RES_TEMP_UNAVAIL; 421 422 rq = get_rdac_req(sdev, &h->inq, len, READ); 423 if (!rq) 424 goto done; 425 426 /* Prepare the command. */ 427 rq->cmd[0] = INQUIRY; 428 rq->cmd[1] = 1; 429 rq->cmd[2] = page_code; 430 rq->cmd[4] = len; 431 rq->cmd_len = COMMAND_SIZE(INQUIRY); 432 433 rq->sense = h->sense; 434 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); 435 rq->sense_len = 0; 436 437 err = blk_execute_rq(q, NULL, rq, 1); 438 if (err == -EIO) 439 err = SCSI_DH_IO; 440 441 blk_put_request(rq); 442 done: 443 return err; 444 } 445 446 static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h, 447 char *array_name) 448 { 449 int err, i; 450 struct c8_inquiry *inqp; 451 452 err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h); 453 if (err == SCSI_DH_OK) { 454 inqp = &h->inq.c8; 455 if (inqp->page_code != 0xc8) 456 return SCSI_DH_NOSYS; 457 if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' || 458 inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd') 459 return SCSI_DH_NOSYS; 460 h->lun = inqp->lun[7]; /* Uses only the last byte */ 461 462 for(i=0; i<ARRAY_LABEL_LEN-1; ++i) 463 *(array_name+i) = inqp->array_user_label[(2*i)+1]; 464 465 *(array_name+ARRAY_LABEL_LEN-1) = '\0'; 466 } 467 return err; 468 } 469 470 static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h) 471 { 472 int err; 473 struct c9_inquiry *inqp; 474 475 h->state = RDAC_STATE_ACTIVE; 476 err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h); 477 if (err == SCSI_DH_OK) { 478 inqp = &h->inq.c9; 479 /* detect the operating mode */ 480 if ((inqp->avte_cvp >> 5) & 0x1) 481 h->mode = RDAC_MODE_IOSHIP; /* LUN in IOSHIP mode */ 482 else if (inqp->avte_cvp >> 7) 483 h->mode = RDAC_MODE_AVT; /* LUN in AVT mode */ 484 else 485 h->mode = RDAC_MODE; /* LUN in RDAC mode */ 486 487 /* Update ownership */ 488 if (inqp->avte_cvp & 0x1) 489 h->lun_state = RDAC_LUN_OWNED; 490 else { 491 h->lun_state = RDAC_LUN_UNOWNED; 492 if (h->mode == RDAC_MODE) 493 h->state = RDAC_STATE_PASSIVE; 494 } 495 496 /* Update path prio*/ 497 if (inqp->path_prio & 0x1) 498 h->preferred = RDAC_PREFERRED; 499 else 500 h->preferred = RDAC_NON_PREFERRED; 501 } 502 503 return err; 504 } 505 506 static int initialize_controller(struct scsi_device *sdev, 507 struct rdac_dh_data *h, char *array_name) 508 { 509 int err; 510 struct c4_inquiry *inqp; 511 512 err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h); 513 if (err == SCSI_DH_OK) { 514 inqp = &h->inq.c4; 515 h->ctlr = get_controller(inqp->subsys_id, inqp->slot_id, 516 array_name); 517 if (!h->ctlr) 518 err = SCSI_DH_RES_TEMP_UNAVAIL; 519 } 520 return err; 521 } 522 523 static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h) 524 { 525 int err; 526 struct c2_inquiry *inqp; 527 528 err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h); 529 if (err == SCSI_DH_OK) { 530 inqp = &h->inq.c2; 531 /* 532 * If more than MODE6_MAX_LUN luns are supported, use 533 * mode select 10 534 */ 535 if (inqp->max_lun_supported >= MODE6_MAX_LUN) 536 h->ctlr->use_ms10 = 1; 537 else 538 h->ctlr->use_ms10 = 0; 539 } 540 return err; 541 } 542 543 static int mode_select_handle_sense(struct scsi_device *sdev, 544 unsigned char *sensebuf) 545 { 546 struct scsi_sense_hdr sense_hdr; 547 int err = SCSI_DH_IO, ret; 548 struct rdac_dh_data *h = get_rdac_data(sdev); 549 550 ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr); 551 if (!ret) 552 goto done; 553 554 switch (sense_hdr.sense_key) { 555 case NO_SENSE: 556 case ABORTED_COMMAND: 557 case UNIT_ATTENTION: 558 err = SCSI_DH_RETRY; 559 break; 560 case NOT_READY: 561 if (sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x01) 562 /* LUN Not Ready and is in the Process of Becoming 563 * Ready 564 */ 565 err = SCSI_DH_RETRY; 566 break; 567 case ILLEGAL_REQUEST: 568 if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36) 569 /* 570 * Command Lock contention 571 */ 572 err = SCSI_DH_RETRY; 573 break; 574 default: 575 break; 576 } 577 578 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " 579 "MODE_SELECT returned with sense %02x/%02x/%02x", 580 (char *) h->ctlr->array_name, h->ctlr->index, 581 sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq); 582 583 done: 584 return err; 585 } 586 587 static void send_mode_select(struct work_struct *work) 588 { 589 struct rdac_controller *ctlr = 590 container_of(work, struct rdac_controller, ms_work); 591 struct request *rq; 592 struct scsi_device *sdev = ctlr->ms_sdev; 593 struct rdac_dh_data *h = get_rdac_data(sdev); 594 struct request_queue *q = sdev->request_queue; 595 int err, retry_cnt = RDAC_RETRY_COUNT; 596 struct rdac_queue_data *tmp, *qdata; 597 LIST_HEAD(list); 598 599 spin_lock(&ctlr->ms_lock); 600 list_splice_init(&ctlr->ms_head, &list); 601 ctlr->ms_queued = 0; 602 ctlr->ms_sdev = NULL; 603 spin_unlock(&ctlr->ms_lock); 604 605 retry: 606 err = SCSI_DH_RES_TEMP_UNAVAIL; 607 rq = rdac_failover_get(sdev, h, &list); 608 if (!rq) 609 goto done; 610 611 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " 612 "%s MODE_SELECT command", 613 (char *) h->ctlr->array_name, h->ctlr->index, 614 (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying"); 615 616 err = blk_execute_rq(q, NULL, rq, 1); 617 blk_put_request(rq); 618 if (err != SCSI_DH_OK) { 619 err = mode_select_handle_sense(sdev, h->sense); 620 if (err == SCSI_DH_RETRY && retry_cnt--) 621 goto retry; 622 } 623 if (err == SCSI_DH_OK) { 624 h->state = RDAC_STATE_ACTIVE; 625 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " 626 "MODE_SELECT completed", 627 (char *) h->ctlr->array_name, h->ctlr->index); 628 } 629 630 done: 631 list_for_each_entry_safe(qdata, tmp, &list, entry) { 632 list_del(&qdata->entry); 633 if (err == SCSI_DH_OK) 634 qdata->h->state = RDAC_STATE_ACTIVE; 635 if (qdata->callback_fn) 636 qdata->callback_fn(qdata->callback_data, err); 637 kfree(qdata); 638 } 639 return; 640 } 641 642 static int queue_mode_select(struct scsi_device *sdev, 643 activate_complete fn, void *data) 644 { 645 struct rdac_queue_data *qdata; 646 struct rdac_controller *ctlr; 647 648 qdata = kzalloc(sizeof(*qdata), GFP_KERNEL); 649 if (!qdata) 650 return SCSI_DH_RETRY; 651 652 qdata->h = get_rdac_data(sdev); 653 qdata->callback_fn = fn; 654 qdata->callback_data = data; 655 656 ctlr = qdata->h->ctlr; 657 spin_lock(&ctlr->ms_lock); 658 list_add_tail(&qdata->entry, &ctlr->ms_head); 659 if (!ctlr->ms_queued) { 660 ctlr->ms_queued = 1; 661 ctlr->ms_sdev = sdev; 662 queue_work(kmpath_rdacd, &ctlr->ms_work); 663 } 664 spin_unlock(&ctlr->ms_lock); 665 return SCSI_DH_OK; 666 } 667 668 static int rdac_activate(struct scsi_device *sdev, 669 activate_complete fn, void *data) 670 { 671 struct rdac_dh_data *h = get_rdac_data(sdev); 672 int err = SCSI_DH_OK; 673 int act = 0; 674 675 err = check_ownership(sdev, h); 676 if (err != SCSI_DH_OK) 677 goto done; 678 679 switch (h->mode) { 680 case RDAC_MODE: 681 if (h->lun_state == RDAC_LUN_UNOWNED) 682 act = 1; 683 break; 684 case RDAC_MODE_IOSHIP: 685 if ((h->lun_state == RDAC_LUN_UNOWNED) && 686 (h->preferred == RDAC_PREFERRED)) 687 act = 1; 688 break; 689 default: 690 break; 691 } 692 693 if (act) { 694 err = queue_mode_select(sdev, fn, data); 695 if (err == SCSI_DH_OK) 696 return 0; 697 } 698 done: 699 if (fn) 700 fn(data, err); 701 return 0; 702 } 703 704 static int rdac_prep_fn(struct scsi_device *sdev, struct request *req) 705 { 706 struct rdac_dh_data *h = get_rdac_data(sdev); 707 int ret = BLKPREP_OK; 708 709 if (h->state != RDAC_STATE_ACTIVE) { 710 ret = BLKPREP_KILL; 711 req->cmd_flags |= REQ_QUIET; 712 } 713 return ret; 714 715 } 716 717 static int rdac_check_sense(struct scsi_device *sdev, 718 struct scsi_sense_hdr *sense_hdr) 719 { 720 struct rdac_dh_data *h = get_rdac_data(sdev); 721 722 RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, " 723 "I/O returned with sense %02x/%02x/%02x", 724 (char *) h->ctlr->array_name, h->ctlr->index, 725 sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq); 726 727 switch (sense_hdr->sense_key) { 728 case NOT_READY: 729 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01) 730 /* LUN Not Ready - Logical Unit Not Ready and is in 731 * the process of becoming ready 732 * Just retry. 733 */ 734 return ADD_TO_MLQUEUE; 735 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81) 736 /* LUN Not Ready - Storage firmware incompatible 737 * Manual code synchonisation required. 738 * 739 * Nothing we can do here. Try to bypass the path. 740 */ 741 return SUCCESS; 742 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1) 743 /* LUN Not Ready - Quiescense in progress 744 * 745 * Just retry and wait. 746 */ 747 return ADD_TO_MLQUEUE; 748 if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02) 749 /* LUN Not Ready - Quiescense in progress 750 * or has been achieved 751 * Just retry. 752 */ 753 return ADD_TO_MLQUEUE; 754 break; 755 case ILLEGAL_REQUEST: 756 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) { 757 /* Invalid Request - Current Logical Unit Ownership. 758 * Controller is not the current owner of the LUN, 759 * Fail the path, so that the other path be used. 760 */ 761 h->state = RDAC_STATE_PASSIVE; 762 return SUCCESS; 763 } 764 break; 765 case UNIT_ATTENTION: 766 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00) 767 /* 768 * Power On, Reset, or Bus Device Reset, just retry. 769 */ 770 return ADD_TO_MLQUEUE; 771 if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02) 772 /* 773 * Quiescence in progress , just retry. 774 */ 775 return ADD_TO_MLQUEUE; 776 break; 777 } 778 /* success just means we do not care what scsi-ml does */ 779 return SCSI_RETURN_NOT_HANDLED; 780 } 781 782 static const struct scsi_dh_devlist rdac_dev_list[] = { 783 {"IBM", "1722"}, 784 {"IBM", "1724"}, 785 {"IBM", "1726"}, 786 {"IBM", "1742"}, 787 {"IBM", "1745"}, 788 {"IBM", "1746"}, 789 {"IBM", "1814"}, 790 {"IBM", "1815"}, 791 {"IBM", "1818"}, 792 {"IBM", "3526"}, 793 {"SGI", "TP9400"}, 794 {"SGI", "TP9500"}, 795 {"SGI", "IS"}, 796 {"STK", "OPENstorage D280"}, 797 {"SUN", "CSM200_R"}, 798 {"SUN", "LCSM100_I"}, 799 {"SUN", "LCSM100_S"}, 800 {"SUN", "LCSM100_E"}, 801 {"SUN", "LCSM100_F"}, 802 {"DELL", "MD3000"}, 803 {"DELL", "MD3000i"}, 804 {"DELL", "MD32xx"}, 805 {"DELL", "MD32xxi"}, 806 {"DELL", "MD36xxi"}, 807 {"DELL", "MD36xxf"}, 808 {"LSI", "INF-01-00"}, 809 {"ENGENIO", "INF-01-00"}, 810 {"STK", "FLEXLINE 380"}, 811 {"SUN", "CSM100_R_FC"}, 812 {"SUN", "STK6580_6780"}, 813 {"SUN", "SUN_6180"}, 814 {NULL, NULL}, 815 }; 816 817 static int rdac_bus_attach(struct scsi_device *sdev); 818 static void rdac_bus_detach(struct scsi_device *sdev); 819 820 static struct scsi_device_handler rdac_dh = { 821 .name = RDAC_NAME, 822 .module = THIS_MODULE, 823 .devlist = rdac_dev_list, 824 .prep_fn = rdac_prep_fn, 825 .check_sense = rdac_check_sense, 826 .attach = rdac_bus_attach, 827 .detach = rdac_bus_detach, 828 .activate = rdac_activate, 829 }; 830 831 static int rdac_bus_attach(struct scsi_device *sdev) 832 { 833 struct scsi_dh_data *scsi_dh_data; 834 struct rdac_dh_data *h; 835 unsigned long flags; 836 int err; 837 char array_name[ARRAY_LABEL_LEN]; 838 839 scsi_dh_data = kzalloc(sizeof(*scsi_dh_data) 840 + sizeof(*h) , GFP_KERNEL); 841 if (!scsi_dh_data) { 842 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n", 843 RDAC_NAME); 844 return 0; 845 } 846 847 scsi_dh_data->scsi_dh = &rdac_dh; 848 h = (struct rdac_dh_data *) scsi_dh_data->buf; 849 h->lun = UNINITIALIZED_LUN; 850 h->state = RDAC_STATE_ACTIVE; 851 852 err = get_lun_info(sdev, h, array_name); 853 if (err != SCSI_DH_OK) 854 goto failed; 855 856 err = initialize_controller(sdev, h, array_name); 857 if (err != SCSI_DH_OK) 858 goto failed; 859 860 err = check_ownership(sdev, h); 861 if (err != SCSI_DH_OK) 862 goto clean_ctlr; 863 864 err = set_mode_select(sdev, h); 865 if (err != SCSI_DH_OK) 866 goto clean_ctlr; 867 868 if (!try_module_get(THIS_MODULE)) 869 goto clean_ctlr; 870 871 spin_lock_irqsave(sdev->request_queue->queue_lock, flags); 872 sdev->scsi_dh_data = scsi_dh_data; 873 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); 874 875 sdev_printk(KERN_NOTICE, sdev, 876 "%s: LUN %d (%s) (%s)\n", 877 RDAC_NAME, h->lun, mode[(int)h->mode], 878 lun_state[(int)h->lun_state]); 879 880 return 0; 881 882 clean_ctlr: 883 kref_put(&h->ctlr->kref, release_controller); 884 885 failed: 886 kfree(scsi_dh_data); 887 sdev_printk(KERN_ERR, sdev, "%s: not attached\n", 888 RDAC_NAME); 889 return -EINVAL; 890 } 891 892 static void rdac_bus_detach( struct scsi_device *sdev ) 893 { 894 struct scsi_dh_data *scsi_dh_data; 895 struct rdac_dh_data *h; 896 unsigned long flags; 897 898 spin_lock_irqsave(sdev->request_queue->queue_lock, flags); 899 scsi_dh_data = sdev->scsi_dh_data; 900 sdev->scsi_dh_data = NULL; 901 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); 902 903 h = (struct rdac_dh_data *) scsi_dh_data->buf; 904 if (h->ctlr) 905 kref_put(&h->ctlr->kref, release_controller); 906 kfree(scsi_dh_data); 907 module_put(THIS_MODULE); 908 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME); 909 } 910 911 912 913 static int __init rdac_init(void) 914 { 915 int r; 916 917 r = scsi_register_device_handler(&rdac_dh); 918 if (r != 0) { 919 printk(KERN_ERR "Failed to register scsi device handler."); 920 goto done; 921 } 922 923 /* 924 * Create workqueue to handle mode selects for rdac 925 */ 926 kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd"); 927 if (!kmpath_rdacd) { 928 scsi_unregister_device_handler(&rdac_dh); 929 printk(KERN_ERR "kmpath_rdacd creation failed.\n"); 930 } 931 done: 932 return r; 933 } 934 935 static void __exit rdac_exit(void) 936 { 937 destroy_workqueue(kmpath_rdacd); 938 scsi_unregister_device_handler(&rdac_dh); 939 } 940 941 module_init(rdac_init); 942 module_exit(rdac_exit); 943 944 MODULE_DESCRIPTION("Multipath LSI/Engenio RDAC driver"); 945 MODULE_AUTHOR("Mike Christie, Chandra Seetharaman"); 946 MODULE_VERSION("01.00.0000.0000"); 947 MODULE_LICENSE("GPL"); 948