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 58 struct rdac_mode_6_hdr { 59 u8 data_len; 60 u8 medium_type; 61 u8 device_params; 62 u8 block_desc_len; 63 }; 64 65 struct 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 73 struct 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 82 struct 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 94 struct 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 }; 104 105 struct 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 31 119 120 struct 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 16 133 struct 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 }; 150 151 struct 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 }; 169 170 struct 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 }; 182 183 struct rdac_dh_data { 184 struct rdac_controller *ctlr; 185 #define UNINITIALIZED_LUN (1 << 8) 186 unsigned lun; 187 188 #define RDAC_MODE 0 189 #define RDAC_MODE_AVT 1 190 #define RDAC_MODE_IOSHIP 2 191 unsigned char mode; 192 193 #define RDAC_STATE_ACTIVE 0 194 #define RDAC_STATE_PASSIVE 1 195 unsigned char state; 196 197 #define RDAC_LUN_UNOWNED 0 198 #define RDAC_LUN_OWNED 1 199 char lun_state; 200 201 #define RDAC_PREFERRED 0 202 #define RDAC_NON_PREFERRED 1 203 char preferred; 204 205 unsigned char sense[SCSI_SENSE_BUFFERSIZE]; 206 union { 207 struct c2_inquiry c2; 208 struct c4_inquiry c4; 209 struct c8_inquiry c8; 210 struct c9_inquiry c9; 211 } inq; 212 }; 213 214 static const char *mode[] = { 215 "RDAC", 216 "AVT", 217 "IOSHIP", 218 }; 219 static const char *lun_state[] = 220 { 221 "unowned", 222 "owned", 223 }; 224 225 struct rdac_queue_data { 226 struct list_head entry; 227 struct rdac_dh_data *h; 228 activate_complete callback_fn; 229 void *callback_data; 230 }; 231 232 static LIST_HEAD(ctlr_list); 233 static DEFINE_SPINLOCK(list_lock); 234 static struct workqueue_struct *kmpath_rdacd; 235 static void send_mode_select(struct work_struct *work); 236 237 /* 238 * module parameter to enable rdac debug logging. 239 * 2 bits for each type of logging, only two types defined for now 240 * Can be enhanced if required at later point 241 */ 242 static int rdac_logging = 1; 243 module_param(rdac_logging, int, S_IRUGO|S_IWUSR); 244 MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, " 245 "Default is 1 - failover logging enabled, " 246 "set it to 0xF to enable all the logs"); 247 248 #define RDAC_LOG_FAILOVER 0 249 #define RDAC_LOG_SENSE 2 250 251 #define RDAC_LOG_BITS 2 252 253 #define RDAC_LOG_LEVEL(SHIFT) \ 254 ((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1)) 255 256 #define RDAC_LOG(SHIFT, sdev, f, arg...) \ 257 do { \ 258 if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \ 259 sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \ 260 } while (0); 261 262 static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev) 263 { 264 struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data; 265 BUG_ON(scsi_dh_data == NULL); 266 return ((struct rdac_dh_data *) scsi_dh_data->buf); 267 } 268 269 static struct request *get_rdac_req(struct scsi_device *sdev, 270 void *buffer, unsigned buflen, int rw) 271 { 272 struct request *rq; 273 struct request_queue *q = sdev->request_queue; 274 275 rq = blk_get_request(q, rw, GFP_NOIO); 276 277 if (!rq) { 278 sdev_printk(KERN_INFO, sdev, 279 "get_rdac_req: blk_get_request failed.\n"); 280 return NULL; 281 } 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_type = REQ_TYPE_BLOCK_PC; 291 rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | 292 REQ_FAILFAST_DRIVER; 293 rq->retries = RDAC_RETRIES; 294 rq->timeout = RDAC_TIMEOUT; 295 296 return rq; 297 } 298 299 static struct request *rdac_failover_get(struct scsi_device *sdev, 300 struct rdac_dh_data *h, struct list_head *list) 301 { 302 struct request *rq; 303 struct rdac_mode_common *common; 304 unsigned data_size; 305 struct rdac_queue_data *qdata; 306 u8 *lun_table; 307 308 if (h->ctlr->use_ms10) { 309 struct rdac_pg_expanded *rdac_pg; 310 311 data_size = sizeof(struct rdac_pg_expanded); 312 rdac_pg = &h->ctlr->mode_select.expanded; 313 memset(rdac_pg, 0, data_size); 314 common = &rdac_pg->common; 315 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40; 316 rdac_pg->subpage_code = 0x1; 317 rdac_pg->page_len[0] = 0x01; 318 rdac_pg->page_len[1] = 0x28; 319 lun_table = rdac_pg->lun_table; 320 } else { 321 struct rdac_pg_legacy *rdac_pg; 322 323 data_size = sizeof(struct rdac_pg_legacy); 324 rdac_pg = &h->ctlr->mode_select.legacy; 325 memset(rdac_pg, 0, data_size); 326 common = &rdac_pg->common; 327 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER; 328 rdac_pg->page_len = 0x68; 329 lun_table = rdac_pg->lun_table; 330 } 331 common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS; 332 common->quiescence_timeout = RDAC_QUIESCENCE_TIME; 333 common->rdac_options = RDAC_FORCED_QUIESENCE; 334 335 list_for_each_entry(qdata, list, entry) { 336 lun_table[qdata->h->lun] = 0x81; 337 } 338 339 /* get request for block layer packet command */ 340 rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE); 341 if (!rq) 342 return NULL; 343 344 /* Prepare the command. */ 345 if (h->ctlr->use_ms10) { 346 rq->cmd[0] = MODE_SELECT_10; 347 rq->cmd[7] = data_size >> 8; 348 rq->cmd[8] = data_size & 0xff; 349 } else { 350 rq->cmd[0] = MODE_SELECT; 351 rq->cmd[4] = data_size; 352 } 353 rq->cmd_len = COMMAND_SIZE(rq->cmd[0]); 354 355 rq->sense = h->sense; 356 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); 357 rq->sense_len = 0; 358 359 return rq; 360 } 361 362 static void release_controller(struct kref *kref) 363 { 364 struct rdac_controller *ctlr; 365 ctlr = container_of(kref, struct rdac_controller, kref); 366 367 list_del(&ctlr->node); 368 kfree(ctlr); 369 } 370 371 static struct rdac_controller *get_controller(int index, char *array_name, 372 u8 *array_id, struct scsi_device *sdev) 373 { 374 struct rdac_controller *ctlr, *tmp; 375 376 list_for_each_entry(tmp, &ctlr_list, node) { 377 if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) && 378 (tmp->index == index) && 379 (tmp->host == sdev->host)) { 380 kref_get(&tmp->kref); 381 return tmp; 382 } 383 } 384 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC); 385 if (!ctlr) 386 return NULL; 387 388 /* initialize fields of controller */ 389 memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN); 390 ctlr->index = index; 391 ctlr->host = sdev->host; 392 memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN); 393 394 kref_init(&ctlr->kref); 395 ctlr->use_ms10 = -1; 396 ctlr->ms_queued = 0; 397 ctlr->ms_sdev = NULL; 398 spin_lock_init(&ctlr->ms_lock); 399 INIT_WORK(&ctlr->ms_work, send_mode_select); 400 INIT_LIST_HEAD(&ctlr->ms_head); 401 list_add(&ctlr->node, &ctlr_list); 402 403 return ctlr; 404 } 405 406 static int submit_inquiry(struct scsi_device *sdev, int page_code, 407 unsigned int len, struct rdac_dh_data *h) 408 { 409 struct request *rq; 410 struct request_queue *q = sdev->request_queue; 411 int err = SCSI_DH_RES_TEMP_UNAVAIL; 412 413 rq = get_rdac_req(sdev, &h->inq, len, READ); 414 if (!rq) 415 goto done; 416 417 /* Prepare the command. */ 418 rq->cmd[0] = INQUIRY; 419 rq->cmd[1] = 1; 420 rq->cmd[2] = page_code; 421 rq->cmd[4] = len; 422 rq->cmd_len = COMMAND_SIZE(INQUIRY); 423 424 rq->sense = h->sense; 425 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); 426 rq->sense_len = 0; 427 428 err = blk_execute_rq(q, NULL, rq, 1); 429 if (err == -EIO) 430 err = SCSI_DH_IO; 431 432 blk_put_request(rq); 433 done: 434 return err; 435 } 436 437 static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h, 438 char *array_name, u8 *array_id) 439 { 440 int err, i; 441 struct c8_inquiry *inqp; 442 443 err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h); 444 if (err == SCSI_DH_OK) { 445 inqp = &h->inq.c8; 446 if (inqp->page_code != 0xc8) 447 return SCSI_DH_NOSYS; 448 if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' || 449 inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd') 450 return SCSI_DH_NOSYS; 451 h->lun = inqp->lun[7]; /* Uses only the last byte */ 452 453 for(i=0; i<ARRAY_LABEL_LEN-1; ++i) 454 *(array_name+i) = inqp->array_user_label[(2*i)+1]; 455 456 *(array_name+ARRAY_LABEL_LEN-1) = '\0'; 457 memset(array_id, 0, UNIQUE_ID_LEN); 458 memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len); 459 } 460 return err; 461 } 462 463 static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h) 464 { 465 int err; 466 struct c9_inquiry *inqp; 467 468 h->state = RDAC_STATE_ACTIVE; 469 err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h); 470 if (err == SCSI_DH_OK) { 471 inqp = &h->inq.c9; 472 /* detect the operating mode */ 473 if ((inqp->avte_cvp >> 5) & 0x1) 474 h->mode = RDAC_MODE_IOSHIP; /* LUN in IOSHIP mode */ 475 else if (inqp->avte_cvp >> 7) 476 h->mode = RDAC_MODE_AVT; /* LUN in AVT mode */ 477 else 478 h->mode = RDAC_MODE; /* LUN in RDAC mode */ 479 480 /* Update ownership */ 481 if (inqp->avte_cvp & 0x1) 482 h->lun_state = RDAC_LUN_OWNED; 483 else { 484 h->lun_state = RDAC_LUN_UNOWNED; 485 if (h->mode == RDAC_MODE) 486 h->state = RDAC_STATE_PASSIVE; 487 } 488 489 /* Update path prio*/ 490 if (inqp->path_prio & 0x1) 491 h->preferred = RDAC_PREFERRED; 492 else 493 h->preferred = RDAC_NON_PREFERRED; 494 } 495 496 return err; 497 } 498 499 static int initialize_controller(struct scsi_device *sdev, 500 struct rdac_dh_data *h, char *array_name, u8 *array_id) 501 { 502 int err, index; 503 struct c4_inquiry *inqp; 504 505 err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h); 506 if (err == SCSI_DH_OK) { 507 inqp = &h->inq.c4; 508 /* get the controller index */ 509 if (inqp->slot_id[1] == 0x31) 510 index = 0; 511 else 512 index = 1; 513 514 spin_lock(&list_lock); 515 h->ctlr = get_controller(index, array_name, array_id, sdev); 516 if (!h->ctlr) 517 err = SCSI_DH_RES_TEMP_UNAVAIL; 518 spin_unlock(&list_lock); 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", "TP9700"}, 796 {"SGI", "IS"}, 797 {"STK", "OPENstorage D280"}, 798 {"SUN", "CSM200_R"}, 799 {"SUN", "LCSM100_I"}, 800 {"SUN", "LCSM100_S"}, 801 {"SUN", "LCSM100_E"}, 802 {"SUN", "LCSM100_F"}, 803 {"DELL", "MD3000"}, 804 {"DELL", "MD3000i"}, 805 {"DELL", "MD32xx"}, 806 {"DELL", "MD32xxi"}, 807 {"DELL", "MD36xxi"}, 808 {"DELL", "MD36xxf"}, 809 {"LSI", "INF-01-00"}, 810 {"ENGENIO", "INF-01-00"}, 811 {"STK", "FLEXLINE 380"}, 812 {"SUN", "CSM100_R_FC"}, 813 {"SUN", "STK6580_6780"}, 814 {"SUN", "SUN_6180"}, 815 {"SUN", "ArrayStorage"}, 816 {NULL, NULL}, 817 }; 818 819 static bool rdac_match(struct scsi_device *sdev) 820 { 821 int i; 822 823 if (scsi_device_tpgs(sdev)) 824 return false; 825 826 for (i = 0; rdac_dev_list[i].vendor; i++) { 827 if (!strncmp(sdev->vendor, rdac_dev_list[i].vendor, 828 strlen(rdac_dev_list[i].vendor)) && 829 !strncmp(sdev->model, rdac_dev_list[i].model, 830 strlen(rdac_dev_list[i].model))) { 831 return true; 832 } 833 } 834 return false; 835 } 836 837 static int rdac_bus_attach(struct scsi_device *sdev); 838 static void rdac_bus_detach(struct scsi_device *sdev); 839 840 static struct scsi_device_handler rdac_dh = { 841 .name = RDAC_NAME, 842 .module = THIS_MODULE, 843 .devlist = rdac_dev_list, 844 .prep_fn = rdac_prep_fn, 845 .check_sense = rdac_check_sense, 846 .attach = rdac_bus_attach, 847 .detach = rdac_bus_detach, 848 .activate = rdac_activate, 849 .match = rdac_match, 850 }; 851 852 static int rdac_bus_attach(struct scsi_device *sdev) 853 { 854 struct scsi_dh_data *scsi_dh_data; 855 struct rdac_dh_data *h; 856 unsigned long flags; 857 int err; 858 char array_name[ARRAY_LABEL_LEN]; 859 char array_id[UNIQUE_ID_LEN]; 860 861 scsi_dh_data = kzalloc(sizeof(*scsi_dh_data) 862 + sizeof(*h) , GFP_KERNEL); 863 if (!scsi_dh_data) { 864 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n", 865 RDAC_NAME); 866 return 0; 867 } 868 869 scsi_dh_data->scsi_dh = &rdac_dh; 870 h = (struct rdac_dh_data *) scsi_dh_data->buf; 871 h->lun = UNINITIALIZED_LUN; 872 h->state = RDAC_STATE_ACTIVE; 873 874 err = get_lun_info(sdev, h, array_name, array_id); 875 if (err != SCSI_DH_OK) 876 goto failed; 877 878 err = initialize_controller(sdev, h, array_name, array_id); 879 if (err != SCSI_DH_OK) 880 goto failed; 881 882 err = check_ownership(sdev, h); 883 if (err != SCSI_DH_OK) 884 goto clean_ctlr; 885 886 err = set_mode_select(sdev, h); 887 if (err != SCSI_DH_OK) 888 goto clean_ctlr; 889 890 if (!try_module_get(THIS_MODULE)) 891 goto clean_ctlr; 892 893 spin_lock_irqsave(sdev->request_queue->queue_lock, flags); 894 sdev->scsi_dh_data = scsi_dh_data; 895 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); 896 897 sdev_printk(KERN_NOTICE, sdev, 898 "%s: LUN %d (%s) (%s)\n", 899 RDAC_NAME, h->lun, mode[(int)h->mode], 900 lun_state[(int)h->lun_state]); 901 902 return 0; 903 904 clean_ctlr: 905 spin_lock(&list_lock); 906 kref_put(&h->ctlr->kref, release_controller); 907 spin_unlock(&list_lock); 908 909 failed: 910 kfree(scsi_dh_data); 911 sdev_printk(KERN_ERR, sdev, "%s: not attached\n", 912 RDAC_NAME); 913 return -EINVAL; 914 } 915 916 static void rdac_bus_detach( struct scsi_device *sdev ) 917 { 918 struct scsi_dh_data *scsi_dh_data; 919 struct rdac_dh_data *h; 920 unsigned long flags; 921 922 scsi_dh_data = sdev->scsi_dh_data; 923 h = (struct rdac_dh_data *) scsi_dh_data->buf; 924 if (h->ctlr && h->ctlr->ms_queued) 925 flush_workqueue(kmpath_rdacd); 926 927 spin_lock_irqsave(sdev->request_queue->queue_lock, flags); 928 sdev->scsi_dh_data = NULL; 929 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); 930 931 spin_lock(&list_lock); 932 if (h->ctlr) 933 kref_put(&h->ctlr->kref, release_controller); 934 spin_unlock(&list_lock); 935 kfree(scsi_dh_data); 936 module_put(THIS_MODULE); 937 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME); 938 } 939 940 941 942 static int __init rdac_init(void) 943 { 944 int r; 945 946 r = scsi_register_device_handler(&rdac_dh); 947 if (r != 0) { 948 printk(KERN_ERR "Failed to register scsi device handler."); 949 goto done; 950 } 951 952 /* 953 * Create workqueue to handle mode selects for rdac 954 */ 955 kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd"); 956 if (!kmpath_rdacd) { 957 scsi_unregister_device_handler(&rdac_dh); 958 printk(KERN_ERR "kmpath_rdacd creation failed.\n"); 959 960 r = -EINVAL; 961 } 962 done: 963 return r; 964 } 965 966 static void __exit rdac_exit(void) 967 { 968 destroy_workqueue(kmpath_rdacd); 969 scsi_unregister_device_handler(&rdac_dh); 970 } 971 972 module_init(rdac_init); 973 module_exit(rdac_exit); 974 975 MODULE_DESCRIPTION("Multipath LSI/Engenio/NetApp E-Series RDAC driver"); 976 MODULE_AUTHOR("Mike Christie, Chandra Seetharaman"); 977 MODULE_VERSION("01.00.0000.0000"); 978 MODULE_LICENSE("GPL"); 979