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 #define UNIQUE_ID_LEN 16 132 struct c8_inquiry { 133 u8 peripheral_info; 134 u8 page_code; /* 0xC8 */ 135 u8 reserved1; 136 u8 page_len; 137 u8 page_id[4]; /* "edid" */ 138 u8 reserved2[3]; 139 u8 vol_uniq_id_len; 140 u8 vol_uniq_id[16]; 141 u8 vol_user_label_len; 142 u8 vol_user_label[60]; 143 u8 array_uniq_id_len; 144 u8 array_unique_id[UNIQUE_ID_LEN]; 145 u8 array_user_label_len; 146 u8 array_user_label[60]; 147 u8 lun[8]; 148 }; 149 150 struct rdac_controller { 151 u8 array_id[UNIQUE_ID_LEN]; 152 int use_ms10; 153 struct kref kref; 154 struct list_head node; /* list of all controllers */ 155 union { 156 struct rdac_pg_legacy legacy; 157 struct rdac_pg_expanded expanded; 158 } mode_select; 159 u8 index; 160 u8 array_name[ARRAY_LABEL_LEN]; 161 struct Scsi_Host *host; 162 spinlock_t ms_lock; 163 int ms_queued; 164 struct work_struct ms_work; 165 struct scsi_device *ms_sdev; 166 struct list_head ms_head; 167 }; 168 169 struct c2_inquiry { 170 u8 peripheral_info; 171 u8 page_code; /* 0xC2 */ 172 u8 reserved1; 173 u8 page_len; 174 u8 page_id[4]; /* "swr4" */ 175 u8 sw_version[3]; 176 u8 sw_date[3]; 177 u8 features_enabled; 178 u8 max_lun_supported; 179 u8 partitions[239]; /* Total allocation length should be 0xFF */ 180 }; 181 182 struct rdac_dh_data { 183 struct rdac_controller *ctlr; 184 #define UNINITIALIZED_LUN (1 << 8) 185 unsigned lun; 186 187 #define RDAC_MODE 0 188 #define RDAC_MODE_AVT 1 189 #define RDAC_MODE_IOSHIP 2 190 unsigned char mode; 191 192 #define RDAC_STATE_ACTIVE 0 193 #define RDAC_STATE_PASSIVE 1 194 unsigned char state; 195 196 #define RDAC_LUN_UNOWNED 0 197 #define RDAC_LUN_OWNED 1 198 char lun_state; 199 200 #define RDAC_PREFERRED 0 201 #define RDAC_NON_PREFERRED 1 202 char preferred; 203 204 unsigned char sense[SCSI_SENSE_BUFFERSIZE]; 205 union { 206 struct c2_inquiry c2; 207 struct c4_inquiry c4; 208 struct c8_inquiry c8; 209 struct c9_inquiry c9; 210 } inq; 211 }; 212 213 static const char *mode[] = { 214 "RDAC", 215 "AVT", 216 "IOSHIP", 217 }; 218 static const char *lun_state[] = 219 { 220 "unowned", 221 "owned", 222 }; 223 224 struct rdac_queue_data { 225 struct list_head entry; 226 struct rdac_dh_data *h; 227 activate_complete callback_fn; 228 void *callback_data; 229 }; 230 231 static LIST_HEAD(ctlr_list); 232 static DEFINE_SPINLOCK(list_lock); 233 static struct workqueue_struct *kmpath_rdacd; 234 static void send_mode_select(struct work_struct *work); 235 236 /* 237 * module parameter to enable rdac debug logging. 238 * 2 bits for each type of logging, only two types defined for now 239 * Can be enhanced if required at later point 240 */ 241 static int rdac_logging = 1; 242 module_param(rdac_logging, int, S_IRUGO|S_IWUSR); 243 MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, " 244 "Default is 1 - failover logging enabled, " 245 "set it to 0xF to enable all the logs"); 246 247 #define RDAC_LOG_FAILOVER 0 248 #define RDAC_LOG_SENSE 2 249 250 #define RDAC_LOG_BITS 2 251 252 #define RDAC_LOG_LEVEL(SHIFT) \ 253 ((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1)) 254 255 #define RDAC_LOG(SHIFT, sdev, f, arg...) \ 256 do { \ 257 if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \ 258 sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \ 259 } while (0); 260 261 static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev) 262 { 263 struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data; 264 BUG_ON(scsi_dh_data == NULL); 265 return ((struct rdac_dh_data *) scsi_dh_data->buf); 266 } 267 268 static 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 (!rq) { 277 sdev_printk(KERN_INFO, sdev, 278 "get_rdac_req: blk_get_request failed.\n"); 279 return NULL; 280 } 281 282 if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) { 283 blk_put_request(rq); 284 sdev_printk(KERN_INFO, sdev, 285 "get_rdac_req: blk_rq_map_kern failed.\n"); 286 return NULL; 287 } 288 289 rq->cmd_type = REQ_TYPE_BLOCK_PC; 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 } 297 298 static 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 } 360 361 static void release_controller(struct kref *kref) 362 { 363 struct rdac_controller *ctlr; 364 ctlr = container_of(kref, struct rdac_controller, kref); 365 366 flush_workqueue(kmpath_rdacd); 367 spin_lock(&list_lock); 368 list_del(&ctlr->node); 369 spin_unlock(&list_lock); 370 kfree(ctlr); 371 } 372 373 static struct rdac_controller *get_controller(int index, char *array_name, 374 u8 *array_id, struct scsi_device *sdev) 375 { 376 struct rdac_controller *ctlr, *tmp; 377 378 spin_lock(&list_lock); 379 380 list_for_each_entry(tmp, &ctlr_list, node) { 381 if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) && 382 (tmp->index == index) && 383 (tmp->host == sdev->host)) { 384 kref_get(&tmp->kref); 385 spin_unlock(&list_lock); 386 return tmp; 387 } 388 } 389 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC); 390 if (!ctlr) 391 goto done; 392 393 /* initialize fields of controller */ 394 memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN); 395 ctlr->index = index; 396 ctlr->host = sdev->host; 397 memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN); 398 399 kref_init(&ctlr->kref); 400 ctlr->use_ms10 = -1; 401 ctlr->ms_queued = 0; 402 ctlr->ms_sdev = NULL; 403 spin_lock_init(&ctlr->ms_lock); 404 INIT_WORK(&ctlr->ms_work, send_mode_select); 405 INIT_LIST_HEAD(&ctlr->ms_head); 406 list_add(&ctlr->node, &ctlr_list); 407 done: 408 spin_unlock(&list_lock); 409 return ctlr; 410 } 411 412 static int submit_inquiry(struct scsi_device *sdev, int page_code, 413 unsigned int len, struct rdac_dh_data *h) 414 { 415 struct request *rq; 416 struct request_queue *q = sdev->request_queue; 417 int err = SCSI_DH_RES_TEMP_UNAVAIL; 418 419 rq = get_rdac_req(sdev, &h->inq, len, READ); 420 if (!rq) 421 goto done; 422 423 /* Prepare the command. */ 424 rq->cmd[0] = INQUIRY; 425 rq->cmd[1] = 1; 426 rq->cmd[2] = page_code; 427 rq->cmd[4] = len; 428 rq->cmd_len = COMMAND_SIZE(INQUIRY); 429 430 rq->sense = h->sense; 431 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); 432 rq->sense_len = 0; 433 434 err = blk_execute_rq(q, NULL, rq, 1); 435 if (err == -EIO) 436 err = SCSI_DH_IO; 437 438 blk_put_request(rq); 439 done: 440 return err; 441 } 442 443 static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h, 444 char *array_name, u8 *array_id) 445 { 446 int err, i; 447 struct c8_inquiry *inqp; 448 449 err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h); 450 if (err == SCSI_DH_OK) { 451 inqp = &h->inq.c8; 452 if (inqp->page_code != 0xc8) 453 return SCSI_DH_NOSYS; 454 if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' || 455 inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd') 456 return SCSI_DH_NOSYS; 457 h->lun = inqp->lun[7]; /* Uses only the last byte */ 458 459 for(i=0; i<ARRAY_LABEL_LEN-1; ++i) 460 *(array_name+i) = inqp->array_user_label[(2*i)+1]; 461 462 *(array_name+ARRAY_LABEL_LEN-1) = '\0'; 463 memset(array_id, 0, UNIQUE_ID_LEN); 464 memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len); 465 } 466 return err; 467 } 468 469 static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h) 470 { 471 int err; 472 struct c9_inquiry *inqp; 473 474 h->state = RDAC_STATE_ACTIVE; 475 err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h); 476 if (err == SCSI_DH_OK) { 477 inqp = &h->inq.c9; 478 /* detect the operating mode */ 479 if ((inqp->avte_cvp >> 5) & 0x1) 480 h->mode = RDAC_MODE_IOSHIP; /* LUN in IOSHIP mode */ 481 else if (inqp->avte_cvp >> 7) 482 h->mode = RDAC_MODE_AVT; /* LUN in AVT mode */ 483 else 484 h->mode = RDAC_MODE; /* LUN in RDAC mode */ 485 486 /* Update ownership */ 487 if (inqp->avte_cvp & 0x1) 488 h->lun_state = RDAC_LUN_OWNED; 489 else { 490 h->lun_state = RDAC_LUN_UNOWNED; 491 if (h->mode == RDAC_MODE) 492 h->state = RDAC_STATE_PASSIVE; 493 } 494 495 /* Update path prio*/ 496 if (inqp->path_prio & 0x1) 497 h->preferred = RDAC_PREFERRED; 498 else 499 h->preferred = RDAC_NON_PREFERRED; 500 } 501 502 return err; 503 } 504 505 static int initialize_controller(struct scsi_device *sdev, 506 struct rdac_dh_data *h, char *array_name, u8 *array_id) 507 { 508 int err, index; 509 struct c4_inquiry *inqp; 510 511 err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h); 512 if (err == SCSI_DH_OK) { 513 inqp = &h->inq.c4; 514 /* get the controller index */ 515 if (inqp->slot_id[1] == 0x31) 516 index = 0; 517 else 518 index = 1; 519 h->ctlr = get_controller(index, array_name, array_id, sdev); 520 if (!h->ctlr) 521 err = SCSI_DH_RES_TEMP_UNAVAIL; 522 } 523 return err; 524 } 525 526 static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h) 527 { 528 int err; 529 struct c2_inquiry *inqp; 530 531 err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h); 532 if (err == SCSI_DH_OK) { 533 inqp = &h->inq.c2; 534 /* 535 * If more than MODE6_MAX_LUN luns are supported, use 536 * mode select 10 537 */ 538 if (inqp->max_lun_supported >= MODE6_MAX_LUN) 539 h->ctlr->use_ms10 = 1; 540 else 541 h->ctlr->use_ms10 = 0; 542 } 543 return err; 544 } 545 546 static int mode_select_handle_sense(struct scsi_device *sdev, 547 unsigned char *sensebuf) 548 { 549 struct scsi_sense_hdr sense_hdr; 550 int err = SCSI_DH_IO, ret; 551 struct rdac_dh_data *h = get_rdac_data(sdev); 552 553 ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr); 554 if (!ret) 555 goto done; 556 557 switch (sense_hdr.sense_key) { 558 case NO_SENSE: 559 case ABORTED_COMMAND: 560 case UNIT_ATTENTION: 561 err = SCSI_DH_RETRY; 562 break; 563 case NOT_READY: 564 if (sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x01) 565 /* LUN Not Ready and is in the Process of Becoming 566 * Ready 567 */ 568 err = SCSI_DH_RETRY; 569 break; 570 case ILLEGAL_REQUEST: 571 if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36) 572 /* 573 * Command Lock contention 574 */ 575 err = SCSI_DH_RETRY; 576 break; 577 default: 578 break; 579 } 580 581 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " 582 "MODE_SELECT returned with sense %02x/%02x/%02x", 583 (char *) h->ctlr->array_name, h->ctlr->index, 584 sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq); 585 586 done: 587 return err; 588 } 589 590 static void send_mode_select(struct work_struct *work) 591 { 592 struct rdac_controller *ctlr = 593 container_of(work, struct rdac_controller, ms_work); 594 struct request *rq; 595 struct scsi_device *sdev = ctlr->ms_sdev; 596 struct rdac_dh_data *h = get_rdac_data(sdev); 597 struct request_queue *q = sdev->request_queue; 598 int err, retry_cnt = RDAC_RETRY_COUNT; 599 struct rdac_queue_data *tmp, *qdata; 600 LIST_HEAD(list); 601 602 spin_lock(&ctlr->ms_lock); 603 list_splice_init(&ctlr->ms_head, &list); 604 ctlr->ms_queued = 0; 605 ctlr->ms_sdev = NULL; 606 spin_unlock(&ctlr->ms_lock); 607 608 retry: 609 err = SCSI_DH_RES_TEMP_UNAVAIL; 610 rq = rdac_failover_get(sdev, h, &list); 611 if (!rq) 612 goto done; 613 614 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " 615 "%s MODE_SELECT command", 616 (char *) h->ctlr->array_name, h->ctlr->index, 617 (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying"); 618 619 err = blk_execute_rq(q, NULL, rq, 1); 620 blk_put_request(rq); 621 if (err != SCSI_DH_OK) { 622 err = mode_select_handle_sense(sdev, h->sense); 623 if (err == SCSI_DH_RETRY && retry_cnt--) 624 goto retry; 625 } 626 if (err == SCSI_DH_OK) { 627 h->state = RDAC_STATE_ACTIVE; 628 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " 629 "MODE_SELECT completed", 630 (char *) h->ctlr->array_name, h->ctlr->index); 631 } 632 633 done: 634 list_for_each_entry_safe(qdata, tmp, &list, entry) { 635 list_del(&qdata->entry); 636 if (err == SCSI_DH_OK) 637 qdata->h->state = RDAC_STATE_ACTIVE; 638 if (qdata->callback_fn) 639 qdata->callback_fn(qdata->callback_data, err); 640 kfree(qdata); 641 } 642 return; 643 } 644 645 static int queue_mode_select(struct scsi_device *sdev, 646 activate_complete fn, void *data) 647 { 648 struct rdac_queue_data *qdata; 649 struct rdac_controller *ctlr; 650 651 qdata = kzalloc(sizeof(*qdata), GFP_KERNEL); 652 if (!qdata) 653 return SCSI_DH_RETRY; 654 655 qdata->h = get_rdac_data(sdev); 656 qdata->callback_fn = fn; 657 qdata->callback_data = data; 658 659 ctlr = qdata->h->ctlr; 660 spin_lock(&ctlr->ms_lock); 661 list_add_tail(&qdata->entry, &ctlr->ms_head); 662 if (!ctlr->ms_queued) { 663 ctlr->ms_queued = 1; 664 ctlr->ms_sdev = sdev; 665 queue_work(kmpath_rdacd, &ctlr->ms_work); 666 } 667 spin_unlock(&ctlr->ms_lock); 668 return SCSI_DH_OK; 669 } 670 671 static int rdac_activate(struct scsi_device *sdev, 672 activate_complete fn, void *data) 673 { 674 struct rdac_dh_data *h = get_rdac_data(sdev); 675 int err = SCSI_DH_OK; 676 int act = 0; 677 678 err = check_ownership(sdev, h); 679 if (err != SCSI_DH_OK) 680 goto done; 681 682 switch (h->mode) { 683 case RDAC_MODE: 684 if (h->lun_state == RDAC_LUN_UNOWNED) 685 act = 1; 686 break; 687 case RDAC_MODE_IOSHIP: 688 if ((h->lun_state == RDAC_LUN_UNOWNED) && 689 (h->preferred == RDAC_PREFERRED)) 690 act = 1; 691 break; 692 default: 693 break; 694 } 695 696 if (act) { 697 err = queue_mode_select(sdev, fn, data); 698 if (err == SCSI_DH_OK) 699 return 0; 700 } 701 done: 702 if (fn) 703 fn(data, err); 704 return 0; 705 } 706 707 static int rdac_prep_fn(struct scsi_device *sdev, struct request *req) 708 { 709 struct rdac_dh_data *h = get_rdac_data(sdev); 710 int ret = BLKPREP_OK; 711 712 if (h->state != RDAC_STATE_ACTIVE) { 713 ret = BLKPREP_KILL; 714 req->cmd_flags |= REQ_QUIET; 715 } 716 return ret; 717 718 } 719 720 static int rdac_check_sense(struct scsi_device *sdev, 721 struct scsi_sense_hdr *sense_hdr) 722 { 723 struct rdac_dh_data *h = get_rdac_data(sdev); 724 725 RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, " 726 "I/O returned with sense %02x/%02x/%02x", 727 (char *) h->ctlr->array_name, h->ctlr->index, 728 sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq); 729 730 switch (sense_hdr->sense_key) { 731 case NOT_READY: 732 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01) 733 /* LUN Not Ready - Logical Unit Not Ready and is in 734 * the process of becoming ready 735 * Just retry. 736 */ 737 return ADD_TO_MLQUEUE; 738 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81) 739 /* LUN Not Ready - Storage firmware incompatible 740 * Manual code synchonisation required. 741 * 742 * Nothing we can do here. Try to bypass the path. 743 */ 744 return SUCCESS; 745 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1) 746 /* LUN Not Ready - Quiescense in progress 747 * 748 * Just retry and wait. 749 */ 750 return ADD_TO_MLQUEUE; 751 if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02) 752 /* LUN Not Ready - Quiescense in progress 753 * or has been achieved 754 * Just retry. 755 */ 756 return ADD_TO_MLQUEUE; 757 break; 758 case ILLEGAL_REQUEST: 759 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) { 760 /* Invalid Request - Current Logical Unit Ownership. 761 * Controller is not the current owner of the LUN, 762 * Fail the path, so that the other path be used. 763 */ 764 h->state = RDAC_STATE_PASSIVE; 765 return SUCCESS; 766 } 767 break; 768 case UNIT_ATTENTION: 769 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00) 770 /* 771 * Power On, Reset, or Bus Device Reset, just retry. 772 */ 773 return ADD_TO_MLQUEUE; 774 if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02) 775 /* 776 * Quiescence in progress , just retry. 777 */ 778 return ADD_TO_MLQUEUE; 779 break; 780 } 781 /* success just means we do not care what scsi-ml does */ 782 return SCSI_RETURN_NOT_HANDLED; 783 } 784 785 static const struct scsi_dh_devlist rdac_dev_list[] = { 786 {"IBM", "1722"}, 787 {"IBM", "1724"}, 788 {"IBM", "1726"}, 789 {"IBM", "1742"}, 790 {"IBM", "1745"}, 791 {"IBM", "1746"}, 792 {"IBM", "1814"}, 793 {"IBM", "1815"}, 794 {"IBM", "1818"}, 795 {"IBM", "3526"}, 796 {"SGI", "TP9400"}, 797 {"SGI", "TP9500"}, 798 {"SGI", "IS"}, 799 {"STK", "OPENstorage D280"}, 800 {"SUN", "CSM200_R"}, 801 {"SUN", "LCSM100_I"}, 802 {"SUN", "LCSM100_S"}, 803 {"SUN", "LCSM100_E"}, 804 {"SUN", "LCSM100_F"}, 805 {"DELL", "MD3000"}, 806 {"DELL", "MD3000i"}, 807 {"DELL", "MD32xx"}, 808 {"DELL", "MD32xxi"}, 809 {"DELL", "MD36xxi"}, 810 {"DELL", "MD36xxf"}, 811 {"LSI", "INF-01-00"}, 812 {"ENGENIO", "INF-01-00"}, 813 {"STK", "FLEXLINE 380"}, 814 {"SUN", "CSM100_R_FC"}, 815 {"SUN", "STK6580_6780"}, 816 {"SUN", "SUN_6180"}, 817 {NULL, NULL}, 818 }; 819 820 static int rdac_bus_attach(struct scsi_device *sdev); 821 static void rdac_bus_detach(struct scsi_device *sdev); 822 823 static struct scsi_device_handler rdac_dh = { 824 .name = RDAC_NAME, 825 .module = THIS_MODULE, 826 .devlist = rdac_dev_list, 827 .prep_fn = rdac_prep_fn, 828 .check_sense = rdac_check_sense, 829 .attach = rdac_bus_attach, 830 .detach = rdac_bus_detach, 831 .activate = rdac_activate, 832 }; 833 834 static int rdac_bus_attach(struct scsi_device *sdev) 835 { 836 struct scsi_dh_data *scsi_dh_data; 837 struct rdac_dh_data *h; 838 unsigned long flags; 839 int err; 840 char array_name[ARRAY_LABEL_LEN]; 841 char array_id[UNIQUE_ID_LEN]; 842 843 scsi_dh_data = kzalloc(sizeof(*scsi_dh_data) 844 + sizeof(*h) , GFP_KERNEL); 845 if (!scsi_dh_data) { 846 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n", 847 RDAC_NAME); 848 return 0; 849 } 850 851 scsi_dh_data->scsi_dh = &rdac_dh; 852 h = (struct rdac_dh_data *) scsi_dh_data->buf; 853 h->lun = UNINITIALIZED_LUN; 854 h->state = RDAC_STATE_ACTIVE; 855 856 err = get_lun_info(sdev, h, array_name, array_id); 857 if (err != SCSI_DH_OK) 858 goto failed; 859 860 err = initialize_controller(sdev, h, array_name, array_id); 861 if (err != SCSI_DH_OK) 862 goto failed; 863 864 err = check_ownership(sdev, h); 865 if (err != SCSI_DH_OK) 866 goto clean_ctlr; 867 868 err = set_mode_select(sdev, h); 869 if (err != SCSI_DH_OK) 870 goto clean_ctlr; 871 872 if (!try_module_get(THIS_MODULE)) 873 goto clean_ctlr; 874 875 spin_lock_irqsave(sdev->request_queue->queue_lock, flags); 876 sdev->scsi_dh_data = scsi_dh_data; 877 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); 878 879 sdev_printk(KERN_NOTICE, sdev, 880 "%s: LUN %d (%s) (%s)\n", 881 RDAC_NAME, h->lun, mode[(int)h->mode], 882 lun_state[(int)h->lun_state]); 883 884 return 0; 885 886 clean_ctlr: 887 kref_put(&h->ctlr->kref, release_controller); 888 889 failed: 890 kfree(scsi_dh_data); 891 sdev_printk(KERN_ERR, sdev, "%s: not attached\n", 892 RDAC_NAME); 893 return -EINVAL; 894 } 895 896 static void rdac_bus_detach( struct scsi_device *sdev ) 897 { 898 struct scsi_dh_data *scsi_dh_data; 899 struct rdac_dh_data *h; 900 unsigned long flags; 901 902 spin_lock_irqsave(sdev->request_queue->queue_lock, flags); 903 scsi_dh_data = sdev->scsi_dh_data; 904 sdev->scsi_dh_data = NULL; 905 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); 906 907 h = (struct rdac_dh_data *) scsi_dh_data->buf; 908 if (h->ctlr) 909 kref_put(&h->ctlr->kref, release_controller); 910 kfree(scsi_dh_data); 911 module_put(THIS_MODULE); 912 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME); 913 } 914 915 916 917 static int __init rdac_init(void) 918 { 919 int r; 920 921 r = scsi_register_device_handler(&rdac_dh); 922 if (r != 0) { 923 printk(KERN_ERR "Failed to register scsi device handler."); 924 goto done; 925 } 926 927 /* 928 * Create workqueue to handle mode selects for rdac 929 */ 930 kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd"); 931 if (!kmpath_rdacd) { 932 scsi_unregister_device_handler(&rdac_dh); 933 printk(KERN_ERR "kmpath_rdacd creation failed.\n"); 934 } 935 done: 936 return r; 937 } 938 939 static void __exit rdac_exit(void) 940 { 941 destroy_workqueue(kmpath_rdacd); 942 scsi_unregister_device_handler(&rdac_dh); 943 } 944 945 module_init(rdac_init); 946 module_exit(rdac_exit); 947 948 MODULE_DESCRIPTION("Multipath LSI/Engenio RDAC driver"); 949 MODULE_AUTHOR("Mike Christie, Chandra Seetharaman"); 950 MODULE_VERSION("01.00.0000.0000"); 951 MODULE_LICENSE("GPL"); 952