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 flush_workqueue(kmpath_rdacd); 368 spin_lock(&list_lock); 369 list_del(&ctlr->node); 370 spin_unlock(&list_lock); 371 kfree(ctlr); 372 } 373 374 static struct rdac_controller *get_controller(int index, char *array_name, 375 u8 *array_id, struct scsi_device *sdev) 376 { 377 struct rdac_controller *ctlr, *tmp; 378 379 spin_lock(&list_lock); 380 381 list_for_each_entry(tmp, &ctlr_list, node) { 382 if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) && 383 (tmp->index == index) && 384 (tmp->host == sdev->host)) { 385 kref_get(&tmp->kref); 386 spin_unlock(&list_lock); 387 return tmp; 388 } 389 } 390 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC); 391 if (!ctlr) 392 goto done; 393 394 /* initialize fields of controller */ 395 memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN); 396 ctlr->index = index; 397 ctlr->host = sdev->host; 398 memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN); 399 400 kref_init(&ctlr->kref); 401 ctlr->use_ms10 = -1; 402 ctlr->ms_queued = 0; 403 ctlr->ms_sdev = NULL; 404 spin_lock_init(&ctlr->ms_lock); 405 INIT_WORK(&ctlr->ms_work, send_mode_select); 406 INIT_LIST_HEAD(&ctlr->ms_head); 407 list_add(&ctlr->node, &ctlr_list); 408 done: 409 spin_unlock(&list_lock); 410 return ctlr; 411 } 412 413 static int submit_inquiry(struct scsi_device *sdev, int page_code, 414 unsigned int len, struct rdac_dh_data *h) 415 { 416 struct request *rq; 417 struct request_queue *q = sdev->request_queue; 418 int err = SCSI_DH_RES_TEMP_UNAVAIL; 419 420 rq = get_rdac_req(sdev, &h->inq, len, READ); 421 if (!rq) 422 goto done; 423 424 /* Prepare the command. */ 425 rq->cmd[0] = INQUIRY; 426 rq->cmd[1] = 1; 427 rq->cmd[2] = page_code; 428 rq->cmd[4] = len; 429 rq->cmd_len = COMMAND_SIZE(INQUIRY); 430 431 rq->sense = h->sense; 432 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); 433 rq->sense_len = 0; 434 435 err = blk_execute_rq(q, NULL, rq, 1); 436 if (err == -EIO) 437 err = SCSI_DH_IO; 438 439 blk_put_request(rq); 440 done: 441 return err; 442 } 443 444 static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h, 445 char *array_name, u8 *array_id) 446 { 447 int err, i; 448 struct c8_inquiry *inqp; 449 450 err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h); 451 if (err == SCSI_DH_OK) { 452 inqp = &h->inq.c8; 453 if (inqp->page_code != 0xc8) 454 return SCSI_DH_NOSYS; 455 if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' || 456 inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd') 457 return SCSI_DH_NOSYS; 458 h->lun = inqp->lun[7]; /* Uses only the last byte */ 459 460 for(i=0; i<ARRAY_LABEL_LEN-1; ++i) 461 *(array_name+i) = inqp->array_user_label[(2*i)+1]; 462 463 *(array_name+ARRAY_LABEL_LEN-1) = '\0'; 464 memset(array_id, 0, UNIQUE_ID_LEN); 465 memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len); 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, u8 *array_id) 508 { 509 int err, index; 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 /* get the controller index */ 516 if (inqp->slot_id[1] == 0x31) 517 index = 0; 518 else 519 index = 1; 520 h->ctlr = get_controller(index, array_name, array_id, sdev); 521 if (!h->ctlr) 522 err = SCSI_DH_RES_TEMP_UNAVAIL; 523 } 524 return err; 525 } 526 527 static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h) 528 { 529 int err; 530 struct c2_inquiry *inqp; 531 532 err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h); 533 if (err == SCSI_DH_OK) { 534 inqp = &h->inq.c2; 535 /* 536 * If more than MODE6_MAX_LUN luns are supported, use 537 * mode select 10 538 */ 539 if (inqp->max_lun_supported >= MODE6_MAX_LUN) 540 h->ctlr->use_ms10 = 1; 541 else 542 h->ctlr->use_ms10 = 0; 543 } 544 return err; 545 } 546 547 static int mode_select_handle_sense(struct scsi_device *sdev, 548 unsigned char *sensebuf) 549 { 550 struct scsi_sense_hdr sense_hdr; 551 int err = SCSI_DH_IO, ret; 552 struct rdac_dh_data *h = get_rdac_data(sdev); 553 554 ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr); 555 if (!ret) 556 goto done; 557 558 switch (sense_hdr.sense_key) { 559 case NO_SENSE: 560 case ABORTED_COMMAND: 561 case UNIT_ATTENTION: 562 err = SCSI_DH_RETRY; 563 break; 564 case NOT_READY: 565 if (sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x01) 566 /* LUN Not Ready and is in the Process of Becoming 567 * Ready 568 */ 569 err = SCSI_DH_RETRY; 570 break; 571 case ILLEGAL_REQUEST: 572 if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36) 573 /* 574 * Command Lock contention 575 */ 576 err = SCSI_DH_RETRY; 577 break; 578 default: 579 break; 580 } 581 582 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " 583 "MODE_SELECT returned with sense %02x/%02x/%02x", 584 (char *) h->ctlr->array_name, h->ctlr->index, 585 sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq); 586 587 done: 588 return err; 589 } 590 591 static void send_mode_select(struct work_struct *work) 592 { 593 struct rdac_controller *ctlr = 594 container_of(work, struct rdac_controller, ms_work); 595 struct request *rq; 596 struct scsi_device *sdev = ctlr->ms_sdev; 597 struct rdac_dh_data *h = get_rdac_data(sdev); 598 struct request_queue *q = sdev->request_queue; 599 int err, retry_cnt = RDAC_RETRY_COUNT; 600 struct rdac_queue_data *tmp, *qdata; 601 LIST_HEAD(list); 602 603 spin_lock(&ctlr->ms_lock); 604 list_splice_init(&ctlr->ms_head, &list); 605 ctlr->ms_queued = 0; 606 ctlr->ms_sdev = NULL; 607 spin_unlock(&ctlr->ms_lock); 608 609 retry: 610 err = SCSI_DH_RES_TEMP_UNAVAIL; 611 rq = rdac_failover_get(sdev, h, &list); 612 if (!rq) 613 goto done; 614 615 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " 616 "%s MODE_SELECT command", 617 (char *) h->ctlr->array_name, h->ctlr->index, 618 (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying"); 619 620 err = blk_execute_rq(q, NULL, rq, 1); 621 blk_put_request(rq); 622 if (err != SCSI_DH_OK) { 623 err = mode_select_handle_sense(sdev, h->sense); 624 if (err == SCSI_DH_RETRY && retry_cnt--) 625 goto retry; 626 } 627 if (err == SCSI_DH_OK) { 628 h->state = RDAC_STATE_ACTIVE; 629 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, " 630 "MODE_SELECT completed", 631 (char *) h->ctlr->array_name, h->ctlr->index); 632 } 633 634 done: 635 list_for_each_entry_safe(qdata, tmp, &list, entry) { 636 list_del(&qdata->entry); 637 if (err == SCSI_DH_OK) 638 qdata->h->state = RDAC_STATE_ACTIVE; 639 if (qdata->callback_fn) 640 qdata->callback_fn(qdata->callback_data, err); 641 kfree(qdata); 642 } 643 return; 644 } 645 646 static int queue_mode_select(struct scsi_device *sdev, 647 activate_complete fn, void *data) 648 { 649 struct rdac_queue_data *qdata; 650 struct rdac_controller *ctlr; 651 652 qdata = kzalloc(sizeof(*qdata), GFP_KERNEL); 653 if (!qdata) 654 return SCSI_DH_RETRY; 655 656 qdata->h = get_rdac_data(sdev); 657 qdata->callback_fn = fn; 658 qdata->callback_data = data; 659 660 ctlr = qdata->h->ctlr; 661 spin_lock(&ctlr->ms_lock); 662 list_add_tail(&qdata->entry, &ctlr->ms_head); 663 if (!ctlr->ms_queued) { 664 ctlr->ms_queued = 1; 665 ctlr->ms_sdev = sdev; 666 queue_work(kmpath_rdacd, &ctlr->ms_work); 667 } 668 spin_unlock(&ctlr->ms_lock); 669 return SCSI_DH_OK; 670 } 671 672 static int rdac_activate(struct scsi_device *sdev, 673 activate_complete fn, void *data) 674 { 675 struct rdac_dh_data *h = get_rdac_data(sdev); 676 int err = SCSI_DH_OK; 677 int act = 0; 678 679 err = check_ownership(sdev, h); 680 if (err != SCSI_DH_OK) 681 goto done; 682 683 switch (h->mode) { 684 case RDAC_MODE: 685 if (h->lun_state == RDAC_LUN_UNOWNED) 686 act = 1; 687 break; 688 case RDAC_MODE_IOSHIP: 689 if ((h->lun_state == RDAC_LUN_UNOWNED) && 690 (h->preferred == RDAC_PREFERRED)) 691 act = 1; 692 break; 693 default: 694 break; 695 } 696 697 if (act) { 698 err = queue_mode_select(sdev, fn, data); 699 if (err == SCSI_DH_OK) 700 return 0; 701 } 702 done: 703 if (fn) 704 fn(data, err); 705 return 0; 706 } 707 708 static int rdac_prep_fn(struct scsi_device *sdev, struct request *req) 709 { 710 struct rdac_dh_data *h = get_rdac_data(sdev); 711 int ret = BLKPREP_OK; 712 713 if (h->state != RDAC_STATE_ACTIVE) { 714 ret = BLKPREP_KILL; 715 req->cmd_flags |= REQ_QUIET; 716 } 717 return ret; 718 719 } 720 721 static int rdac_check_sense(struct scsi_device *sdev, 722 struct scsi_sense_hdr *sense_hdr) 723 { 724 struct rdac_dh_data *h = get_rdac_data(sdev); 725 726 RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, " 727 "I/O returned with sense %02x/%02x/%02x", 728 (char *) h->ctlr->array_name, h->ctlr->index, 729 sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq); 730 731 switch (sense_hdr->sense_key) { 732 case NOT_READY: 733 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01) 734 /* LUN Not Ready - Logical Unit Not Ready and is in 735 * the process of becoming ready 736 * Just retry. 737 */ 738 return ADD_TO_MLQUEUE; 739 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81) 740 /* LUN Not Ready - Storage firmware incompatible 741 * Manual code synchonisation required. 742 * 743 * Nothing we can do here. Try to bypass the path. 744 */ 745 return SUCCESS; 746 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1) 747 /* LUN Not Ready - Quiescense in progress 748 * 749 * Just retry and wait. 750 */ 751 return ADD_TO_MLQUEUE; 752 if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02) 753 /* LUN Not Ready - Quiescense in progress 754 * or has been achieved 755 * Just retry. 756 */ 757 return ADD_TO_MLQUEUE; 758 break; 759 case ILLEGAL_REQUEST: 760 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) { 761 /* Invalid Request - Current Logical Unit Ownership. 762 * Controller is not the current owner of the LUN, 763 * Fail the path, so that the other path be used. 764 */ 765 h->state = RDAC_STATE_PASSIVE; 766 return SUCCESS; 767 } 768 break; 769 case UNIT_ATTENTION: 770 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00) 771 /* 772 * Power On, Reset, or Bus Device Reset, just retry. 773 */ 774 return ADD_TO_MLQUEUE; 775 if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02) 776 /* 777 * Quiescence in progress , just retry. 778 */ 779 return ADD_TO_MLQUEUE; 780 break; 781 } 782 /* success just means we do not care what scsi-ml does */ 783 return SCSI_RETURN_NOT_HANDLED; 784 } 785 786 static const struct scsi_dh_devlist rdac_dev_list[] = { 787 {"IBM", "1722"}, 788 {"IBM", "1724"}, 789 {"IBM", "1726"}, 790 {"IBM", "1742"}, 791 {"IBM", "1745"}, 792 {"IBM", "1746"}, 793 {"IBM", "1814"}, 794 {"IBM", "1815"}, 795 {"IBM", "1818"}, 796 {"IBM", "3526"}, 797 {"SGI", "TP9400"}, 798 {"SGI", "TP9500"}, 799 {"SGI", "TP9700"}, 800 {"SGI", "IS"}, 801 {"STK", "OPENstorage D280"}, 802 {"SUN", "CSM200_R"}, 803 {"SUN", "LCSM100_I"}, 804 {"SUN", "LCSM100_S"}, 805 {"SUN", "LCSM100_E"}, 806 {"SUN", "LCSM100_F"}, 807 {"DELL", "MD3000"}, 808 {"DELL", "MD3000i"}, 809 {"DELL", "MD32xx"}, 810 {"DELL", "MD32xxi"}, 811 {"DELL", "MD36xxi"}, 812 {"DELL", "MD36xxf"}, 813 {"LSI", "INF-01-00"}, 814 {"ENGENIO", "INF-01-00"}, 815 {"STK", "FLEXLINE 380"}, 816 {"SUN", "CSM100_R_FC"}, 817 {"SUN", "STK6580_6780"}, 818 {"SUN", "SUN_6180"}, 819 {"SUN", "ArrayStorage"}, 820 {NULL, NULL}, 821 }; 822 823 static int rdac_bus_attach(struct scsi_device *sdev); 824 static void rdac_bus_detach(struct scsi_device *sdev); 825 826 static struct scsi_device_handler rdac_dh = { 827 .name = RDAC_NAME, 828 .module = THIS_MODULE, 829 .devlist = rdac_dev_list, 830 .prep_fn = rdac_prep_fn, 831 .check_sense = rdac_check_sense, 832 .attach = rdac_bus_attach, 833 .detach = rdac_bus_detach, 834 .activate = rdac_activate, 835 }; 836 837 static int rdac_bus_attach(struct scsi_device *sdev) 838 { 839 struct scsi_dh_data *scsi_dh_data; 840 struct rdac_dh_data *h; 841 unsigned long flags; 842 int err; 843 char array_name[ARRAY_LABEL_LEN]; 844 char array_id[UNIQUE_ID_LEN]; 845 846 scsi_dh_data = kzalloc(sizeof(*scsi_dh_data) 847 + sizeof(*h) , GFP_KERNEL); 848 if (!scsi_dh_data) { 849 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n", 850 RDAC_NAME); 851 return 0; 852 } 853 854 scsi_dh_data->scsi_dh = &rdac_dh; 855 h = (struct rdac_dh_data *) scsi_dh_data->buf; 856 h->lun = UNINITIALIZED_LUN; 857 h->state = RDAC_STATE_ACTIVE; 858 859 err = get_lun_info(sdev, h, array_name, array_id); 860 if (err != SCSI_DH_OK) 861 goto failed; 862 863 err = initialize_controller(sdev, h, array_name, array_id); 864 if (err != SCSI_DH_OK) 865 goto failed; 866 867 err = check_ownership(sdev, h); 868 if (err != SCSI_DH_OK) 869 goto clean_ctlr; 870 871 err = set_mode_select(sdev, h); 872 if (err != SCSI_DH_OK) 873 goto clean_ctlr; 874 875 if (!try_module_get(THIS_MODULE)) 876 goto clean_ctlr; 877 878 spin_lock_irqsave(sdev->request_queue->queue_lock, flags); 879 sdev->scsi_dh_data = scsi_dh_data; 880 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); 881 882 sdev_printk(KERN_NOTICE, sdev, 883 "%s: LUN %d (%s) (%s)\n", 884 RDAC_NAME, h->lun, mode[(int)h->mode], 885 lun_state[(int)h->lun_state]); 886 887 return 0; 888 889 clean_ctlr: 890 kref_put(&h->ctlr->kref, release_controller); 891 892 failed: 893 kfree(scsi_dh_data); 894 sdev_printk(KERN_ERR, sdev, "%s: not attached\n", 895 RDAC_NAME); 896 return -EINVAL; 897 } 898 899 static void rdac_bus_detach( struct scsi_device *sdev ) 900 { 901 struct scsi_dh_data *scsi_dh_data; 902 struct rdac_dh_data *h; 903 unsigned long flags; 904 905 spin_lock_irqsave(sdev->request_queue->queue_lock, flags); 906 scsi_dh_data = sdev->scsi_dh_data; 907 sdev->scsi_dh_data = NULL; 908 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); 909 910 h = (struct rdac_dh_data *) scsi_dh_data->buf; 911 if (h->ctlr) 912 kref_put(&h->ctlr->kref, release_controller); 913 kfree(scsi_dh_data); 914 module_put(THIS_MODULE); 915 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME); 916 } 917 918 919 920 static int __init rdac_init(void) 921 { 922 int r; 923 924 r = scsi_register_device_handler(&rdac_dh); 925 if (r != 0) { 926 printk(KERN_ERR "Failed to register scsi device handler."); 927 goto done; 928 } 929 930 /* 931 * Create workqueue to handle mode selects for rdac 932 */ 933 kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd"); 934 if (!kmpath_rdacd) { 935 scsi_unregister_device_handler(&rdac_dh); 936 printk(KERN_ERR "kmpath_rdacd creation failed.\n"); 937 } 938 done: 939 return r; 940 } 941 942 static void __exit rdac_exit(void) 943 { 944 destroy_workqueue(kmpath_rdacd); 945 scsi_unregister_device_handler(&rdac_dh); 946 } 947 948 module_init(rdac_init); 949 module_exit(rdac_exit); 950 951 MODULE_DESCRIPTION("Multipath LSI/Engenio/NetApp E-Series RDAC driver"); 952 MODULE_AUTHOR("Mike Christie, Chandra Seetharaman"); 953 MODULE_VERSION("01.00.0000.0000"); 954 MODULE_LICENSE("GPL"); 955