1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2017-2018 Christoph Hellwig. 4 */ 5 6 #include <linux/backing-dev.h> 7 #include <linux/moduleparam.h> 8 #include <trace/events/block.h> 9 #include "nvme.h" 10 11 static bool multipath = true; 12 module_param(multipath, bool, 0444); 13 MODULE_PARM_DESC(multipath, 14 "turn on native support for multiple controllers per subsystem"); 15 16 void nvme_mpath_unfreeze(struct nvme_subsystem *subsys) 17 { 18 struct nvme_ns_head *h; 19 20 lockdep_assert_held(&subsys->lock); 21 list_for_each_entry(h, &subsys->nsheads, entry) 22 if (h->disk) 23 blk_mq_unfreeze_queue(h->disk->queue); 24 } 25 26 void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys) 27 { 28 struct nvme_ns_head *h; 29 30 lockdep_assert_held(&subsys->lock); 31 list_for_each_entry(h, &subsys->nsheads, entry) 32 if (h->disk) 33 blk_mq_freeze_queue_wait(h->disk->queue); 34 } 35 36 void nvme_mpath_start_freeze(struct nvme_subsystem *subsys) 37 { 38 struct nvme_ns_head *h; 39 40 lockdep_assert_held(&subsys->lock); 41 list_for_each_entry(h, &subsys->nsheads, entry) 42 if (h->disk) 43 blk_freeze_queue_start(h->disk->queue); 44 } 45 46 /* 47 * If multipathing is enabled we need to always use the subsystem instance 48 * number for numbering our devices to avoid conflicts between subsystems that 49 * have multiple controllers and thus use the multipath-aware subsystem node 50 * and those that have a single controller and use the controller node 51 * directly. 52 */ 53 void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns, 54 struct nvme_ctrl *ctrl, int *flags) 55 { 56 if (!multipath) { 57 sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->head->instance); 58 } else if (ns->head->disk) { 59 sprintf(disk_name, "nvme%dc%dn%d", ctrl->subsys->instance, 60 ctrl->instance, ns->head->instance); 61 *flags = GENHD_FL_HIDDEN; 62 } else { 63 sprintf(disk_name, "nvme%dn%d", ctrl->subsys->instance, 64 ns->head->instance); 65 } 66 } 67 68 void nvme_failover_req(struct request *req) 69 { 70 struct nvme_ns *ns = req->q->queuedata; 71 u16 status = nvme_req(req)->status & 0x7ff; 72 unsigned long flags; 73 74 nvme_mpath_clear_current_path(ns); 75 76 /* 77 * If we got back an ANA error, we know the controller is alive but not 78 * ready to serve this namespace. Kick of a re-read of the ANA 79 * information page, and just try any other available path for now. 80 */ 81 if (nvme_is_ana_error(status) && ns->ctrl->ana_log_buf) { 82 set_bit(NVME_NS_ANA_PENDING, &ns->flags); 83 queue_work(nvme_wq, &ns->ctrl->ana_work); 84 } 85 86 spin_lock_irqsave(&ns->head->requeue_lock, flags); 87 blk_steal_bios(&ns->head->requeue_list, req); 88 spin_unlock_irqrestore(&ns->head->requeue_lock, flags); 89 90 blk_mq_end_request(req, 0); 91 kblockd_schedule_work(&ns->head->requeue_work); 92 } 93 94 void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl) 95 { 96 struct nvme_ns *ns; 97 98 down_read(&ctrl->namespaces_rwsem); 99 list_for_each_entry(ns, &ctrl->namespaces, list) { 100 if (ns->head->disk) 101 kblockd_schedule_work(&ns->head->requeue_work); 102 } 103 up_read(&ctrl->namespaces_rwsem); 104 } 105 106 static const char *nvme_ana_state_names[] = { 107 [0] = "invalid state", 108 [NVME_ANA_OPTIMIZED] = "optimized", 109 [NVME_ANA_NONOPTIMIZED] = "non-optimized", 110 [NVME_ANA_INACCESSIBLE] = "inaccessible", 111 [NVME_ANA_PERSISTENT_LOSS] = "persistent-loss", 112 [NVME_ANA_CHANGE] = "change", 113 }; 114 115 bool nvme_mpath_clear_current_path(struct nvme_ns *ns) 116 { 117 struct nvme_ns_head *head = ns->head; 118 bool changed = false; 119 int node; 120 121 if (!head) 122 goto out; 123 124 for_each_node(node) { 125 if (ns == rcu_access_pointer(head->current_path[node])) { 126 rcu_assign_pointer(head->current_path[node], NULL); 127 changed = true; 128 } 129 } 130 out: 131 return changed; 132 } 133 134 void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl) 135 { 136 struct nvme_ns *ns; 137 138 mutex_lock(&ctrl->scan_lock); 139 down_read(&ctrl->namespaces_rwsem); 140 list_for_each_entry(ns, &ctrl->namespaces, list) 141 if (nvme_mpath_clear_current_path(ns)) 142 kblockd_schedule_work(&ns->head->requeue_work); 143 up_read(&ctrl->namespaces_rwsem); 144 mutex_unlock(&ctrl->scan_lock); 145 } 146 147 static bool nvme_path_is_disabled(struct nvme_ns *ns) 148 { 149 /* 150 * We don't treat NVME_CTRL_DELETING as a disabled path as I/O should 151 * still be able to complete assuming that the controller is connected. 152 * Otherwise it will fail immediately and return to the requeue list. 153 */ 154 if (ns->ctrl->state != NVME_CTRL_LIVE && 155 ns->ctrl->state != NVME_CTRL_DELETING) 156 return true; 157 if (test_bit(NVME_NS_ANA_PENDING, &ns->flags) || 158 test_bit(NVME_NS_REMOVING, &ns->flags)) 159 return true; 160 return false; 161 } 162 163 static struct nvme_ns *__nvme_find_path(struct nvme_ns_head *head, int node) 164 { 165 int found_distance = INT_MAX, fallback_distance = INT_MAX, distance; 166 struct nvme_ns *found = NULL, *fallback = NULL, *ns; 167 168 list_for_each_entry_rcu(ns, &head->list, siblings) { 169 if (nvme_path_is_disabled(ns)) 170 continue; 171 172 if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_NUMA) 173 distance = node_distance(node, ns->ctrl->numa_node); 174 else 175 distance = LOCAL_DISTANCE; 176 177 switch (ns->ana_state) { 178 case NVME_ANA_OPTIMIZED: 179 if (distance < found_distance) { 180 found_distance = distance; 181 found = ns; 182 } 183 break; 184 case NVME_ANA_NONOPTIMIZED: 185 if (distance < fallback_distance) { 186 fallback_distance = distance; 187 fallback = ns; 188 } 189 break; 190 default: 191 break; 192 } 193 } 194 195 if (!found) 196 found = fallback; 197 if (found) 198 rcu_assign_pointer(head->current_path[node], found); 199 return found; 200 } 201 202 static struct nvme_ns *nvme_next_ns(struct nvme_ns_head *head, 203 struct nvme_ns *ns) 204 { 205 ns = list_next_or_null_rcu(&head->list, &ns->siblings, struct nvme_ns, 206 siblings); 207 if (ns) 208 return ns; 209 return list_first_or_null_rcu(&head->list, struct nvme_ns, siblings); 210 } 211 212 static struct nvme_ns *nvme_round_robin_path(struct nvme_ns_head *head, 213 int node, struct nvme_ns *old) 214 { 215 struct nvme_ns *ns, *found = NULL; 216 217 if (list_is_singular(&head->list)) { 218 if (nvme_path_is_disabled(old)) 219 return NULL; 220 return old; 221 } 222 223 for (ns = nvme_next_ns(head, old); 224 ns != old; 225 ns = nvme_next_ns(head, ns)) { 226 if (nvme_path_is_disabled(ns)) 227 continue; 228 229 if (ns->ana_state == NVME_ANA_OPTIMIZED) { 230 found = ns; 231 goto out; 232 } 233 if (ns->ana_state == NVME_ANA_NONOPTIMIZED) 234 found = ns; 235 } 236 237 /* 238 * The loop above skips the current path for round-robin semantics. 239 * Fall back to the current path if either: 240 * - no other optimized path found and current is optimized, 241 * - no other usable path found and current is usable. 242 */ 243 if (!nvme_path_is_disabled(old) && 244 (old->ana_state == NVME_ANA_OPTIMIZED || 245 (!found && old->ana_state == NVME_ANA_NONOPTIMIZED))) 246 return old; 247 248 if (!found) 249 return NULL; 250 out: 251 rcu_assign_pointer(head->current_path[node], found); 252 return found; 253 } 254 255 static inline bool nvme_path_is_optimized(struct nvme_ns *ns) 256 { 257 return ns->ctrl->state == NVME_CTRL_LIVE && 258 ns->ana_state == NVME_ANA_OPTIMIZED; 259 } 260 261 inline struct nvme_ns *nvme_find_path(struct nvme_ns_head *head) 262 { 263 int node = numa_node_id(); 264 struct nvme_ns *ns; 265 266 ns = srcu_dereference(head->current_path[node], &head->srcu); 267 if (unlikely(!ns)) 268 return __nvme_find_path(head, node); 269 270 if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR) 271 return nvme_round_robin_path(head, node, ns); 272 if (unlikely(!nvme_path_is_optimized(ns))) 273 return __nvme_find_path(head, node); 274 return ns; 275 } 276 277 static bool nvme_available_path(struct nvme_ns_head *head) 278 { 279 struct nvme_ns *ns; 280 281 list_for_each_entry_rcu(ns, &head->list, siblings) { 282 switch (ns->ctrl->state) { 283 case NVME_CTRL_LIVE: 284 case NVME_CTRL_RESETTING: 285 case NVME_CTRL_CONNECTING: 286 /* fallthru */ 287 return true; 288 default: 289 break; 290 } 291 } 292 return false; 293 } 294 295 blk_qc_t nvme_ns_head_submit_bio(struct bio *bio) 296 { 297 struct nvme_ns_head *head = bio->bi_disk->private_data; 298 struct device *dev = disk_to_dev(head->disk); 299 struct nvme_ns *ns; 300 blk_qc_t ret = BLK_QC_T_NONE; 301 int srcu_idx; 302 303 /* 304 * The namespace might be going away and the bio might be moved to a 305 * different queue via blk_steal_bios(), so we need to use the bio_split 306 * pool from the original queue to allocate the bvecs from. 307 */ 308 blk_queue_split(&bio); 309 310 srcu_idx = srcu_read_lock(&head->srcu); 311 ns = nvme_find_path(head); 312 if (likely(ns)) { 313 bio->bi_disk = ns->disk; 314 bio->bi_opf |= REQ_NVME_MPATH; 315 trace_block_bio_remap(bio->bi_disk->queue, bio, 316 disk_devt(ns->head->disk), 317 bio->bi_iter.bi_sector); 318 ret = submit_bio_noacct(bio); 319 } else if (nvme_available_path(head)) { 320 dev_warn_ratelimited(dev, "no usable path - requeuing I/O\n"); 321 322 spin_lock_irq(&head->requeue_lock); 323 bio_list_add(&head->requeue_list, bio); 324 spin_unlock_irq(&head->requeue_lock); 325 } else { 326 dev_warn_ratelimited(dev, "no available path - failing I/O\n"); 327 328 bio->bi_status = BLK_STS_IOERR; 329 bio_endio(bio); 330 } 331 332 srcu_read_unlock(&head->srcu, srcu_idx); 333 return ret; 334 } 335 336 static void nvme_requeue_work(struct work_struct *work) 337 { 338 struct nvme_ns_head *head = 339 container_of(work, struct nvme_ns_head, requeue_work); 340 struct bio *bio, *next; 341 342 spin_lock_irq(&head->requeue_lock); 343 next = bio_list_get(&head->requeue_list); 344 spin_unlock_irq(&head->requeue_lock); 345 346 while ((bio = next) != NULL) { 347 next = bio->bi_next; 348 bio->bi_next = NULL; 349 350 /* 351 * Reset disk to the mpath node and resubmit to select a new 352 * path. 353 */ 354 bio->bi_disk = head->disk; 355 submit_bio_noacct(bio); 356 } 357 } 358 359 int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head) 360 { 361 struct request_queue *q; 362 bool vwc = false; 363 364 mutex_init(&head->lock); 365 bio_list_init(&head->requeue_list); 366 spin_lock_init(&head->requeue_lock); 367 INIT_WORK(&head->requeue_work, nvme_requeue_work); 368 369 /* 370 * Add a multipath node if the subsystems supports multiple controllers. 371 * We also do this for private namespaces as the namespace sharing data could 372 * change after a rescan. 373 */ 374 if (!(ctrl->subsys->cmic & NVME_CTRL_CMIC_MULTI_CTRL) || !multipath) 375 return 0; 376 377 q = blk_alloc_queue(ctrl->numa_node); 378 if (!q) 379 goto out; 380 blk_queue_flag_set(QUEUE_FLAG_NONROT, q); 381 /* set to a default value for 512 until disk is validated */ 382 blk_queue_logical_block_size(q, 512); 383 blk_set_stacking_limits(&q->limits); 384 385 /* we need to propagate up the VMC settings */ 386 if (ctrl->vwc & NVME_CTRL_VWC_PRESENT) 387 vwc = true; 388 blk_queue_write_cache(q, vwc, vwc); 389 390 head->disk = alloc_disk(0); 391 if (!head->disk) 392 goto out_cleanup_queue; 393 head->disk->fops = &nvme_ns_head_ops; 394 head->disk->private_data = head; 395 head->disk->queue = q; 396 head->disk->flags = GENHD_FL_EXT_DEVT; 397 sprintf(head->disk->disk_name, "nvme%dn%d", 398 ctrl->subsys->instance, head->instance); 399 return 0; 400 401 out_cleanup_queue: 402 blk_cleanup_queue(q); 403 out: 404 return -ENOMEM; 405 } 406 407 static void nvme_mpath_set_live(struct nvme_ns *ns) 408 { 409 struct nvme_ns_head *head = ns->head; 410 411 if (!head->disk) 412 return; 413 414 if (!test_and_set_bit(NVME_NSHEAD_DISK_LIVE, &head->flags)) 415 device_add_disk(&head->subsys->dev, head->disk, 416 nvme_ns_id_attr_groups); 417 418 mutex_lock(&head->lock); 419 if (nvme_path_is_optimized(ns)) { 420 int node, srcu_idx; 421 422 srcu_idx = srcu_read_lock(&head->srcu); 423 for_each_node(node) 424 __nvme_find_path(head, node); 425 srcu_read_unlock(&head->srcu, srcu_idx); 426 } 427 mutex_unlock(&head->lock); 428 429 synchronize_srcu(&head->srcu); 430 kblockd_schedule_work(&head->requeue_work); 431 } 432 433 static int nvme_parse_ana_log(struct nvme_ctrl *ctrl, void *data, 434 int (*cb)(struct nvme_ctrl *ctrl, struct nvme_ana_group_desc *, 435 void *)) 436 { 437 void *base = ctrl->ana_log_buf; 438 size_t offset = sizeof(struct nvme_ana_rsp_hdr); 439 int error, i; 440 441 lockdep_assert_held(&ctrl->ana_lock); 442 443 for (i = 0; i < le16_to_cpu(ctrl->ana_log_buf->ngrps); i++) { 444 struct nvme_ana_group_desc *desc = base + offset; 445 u32 nr_nsids; 446 size_t nsid_buf_size; 447 448 if (WARN_ON_ONCE(offset > ctrl->ana_log_size - sizeof(*desc))) 449 return -EINVAL; 450 451 nr_nsids = le32_to_cpu(desc->nnsids); 452 nsid_buf_size = nr_nsids * sizeof(__le32); 453 454 if (WARN_ON_ONCE(desc->grpid == 0)) 455 return -EINVAL; 456 if (WARN_ON_ONCE(le32_to_cpu(desc->grpid) > ctrl->anagrpmax)) 457 return -EINVAL; 458 if (WARN_ON_ONCE(desc->state == 0)) 459 return -EINVAL; 460 if (WARN_ON_ONCE(desc->state > NVME_ANA_CHANGE)) 461 return -EINVAL; 462 463 offset += sizeof(*desc); 464 if (WARN_ON_ONCE(offset > ctrl->ana_log_size - nsid_buf_size)) 465 return -EINVAL; 466 467 error = cb(ctrl, desc, data); 468 if (error) 469 return error; 470 471 offset += nsid_buf_size; 472 } 473 474 return 0; 475 } 476 477 static inline bool nvme_state_is_live(enum nvme_ana_state state) 478 { 479 return state == NVME_ANA_OPTIMIZED || state == NVME_ANA_NONOPTIMIZED; 480 } 481 482 static void nvme_update_ns_ana_state(struct nvme_ana_group_desc *desc, 483 struct nvme_ns *ns) 484 { 485 ns->ana_grpid = le32_to_cpu(desc->grpid); 486 ns->ana_state = desc->state; 487 clear_bit(NVME_NS_ANA_PENDING, &ns->flags); 488 489 if (nvme_state_is_live(ns->ana_state)) 490 nvme_mpath_set_live(ns); 491 } 492 493 static int nvme_update_ana_state(struct nvme_ctrl *ctrl, 494 struct nvme_ana_group_desc *desc, void *data) 495 { 496 u32 nr_nsids = le32_to_cpu(desc->nnsids), n = 0; 497 unsigned *nr_change_groups = data; 498 struct nvme_ns *ns; 499 500 dev_dbg(ctrl->device, "ANA group %d: %s.\n", 501 le32_to_cpu(desc->grpid), 502 nvme_ana_state_names[desc->state]); 503 504 if (desc->state == NVME_ANA_CHANGE) 505 (*nr_change_groups)++; 506 507 if (!nr_nsids) 508 return 0; 509 510 down_read(&ctrl->namespaces_rwsem); 511 list_for_each_entry(ns, &ctrl->namespaces, list) { 512 unsigned nsid = le32_to_cpu(desc->nsids[n]); 513 514 if (ns->head->ns_id < nsid) 515 continue; 516 if (ns->head->ns_id == nsid) 517 nvme_update_ns_ana_state(desc, ns); 518 if (++n == nr_nsids) 519 break; 520 } 521 up_read(&ctrl->namespaces_rwsem); 522 return 0; 523 } 524 525 static int nvme_read_ana_log(struct nvme_ctrl *ctrl) 526 { 527 u32 nr_change_groups = 0; 528 int error; 529 530 mutex_lock(&ctrl->ana_lock); 531 error = nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_ANA, 0, NVME_CSI_NVM, 532 ctrl->ana_log_buf, ctrl->ana_log_size, 0); 533 if (error) { 534 dev_warn(ctrl->device, "Failed to get ANA log: %d\n", error); 535 goto out_unlock; 536 } 537 538 error = nvme_parse_ana_log(ctrl, &nr_change_groups, 539 nvme_update_ana_state); 540 if (error) 541 goto out_unlock; 542 543 /* 544 * In theory we should have an ANATT timer per group as they might enter 545 * the change state at different times. But that is a lot of overhead 546 * just to protect against a target that keeps entering new changes 547 * states while never finishing previous ones. But we'll still 548 * eventually time out once all groups are in change state, so this 549 * isn't a big deal. 550 * 551 * We also double the ANATT value to provide some slack for transports 552 * or AEN processing overhead. 553 */ 554 if (nr_change_groups) 555 mod_timer(&ctrl->anatt_timer, ctrl->anatt * HZ * 2 + jiffies); 556 else 557 del_timer_sync(&ctrl->anatt_timer); 558 out_unlock: 559 mutex_unlock(&ctrl->ana_lock); 560 return error; 561 } 562 563 static void nvme_ana_work(struct work_struct *work) 564 { 565 struct nvme_ctrl *ctrl = container_of(work, struct nvme_ctrl, ana_work); 566 567 if (ctrl->state != NVME_CTRL_LIVE) 568 return; 569 570 nvme_read_ana_log(ctrl); 571 } 572 573 static void nvme_anatt_timeout(struct timer_list *t) 574 { 575 struct nvme_ctrl *ctrl = from_timer(ctrl, t, anatt_timer); 576 577 dev_info(ctrl->device, "ANATT timeout, resetting controller.\n"); 578 nvme_reset_ctrl(ctrl); 579 } 580 581 void nvme_mpath_stop(struct nvme_ctrl *ctrl) 582 { 583 if (!nvme_ctrl_use_ana(ctrl)) 584 return; 585 del_timer_sync(&ctrl->anatt_timer); 586 cancel_work_sync(&ctrl->ana_work); 587 } 588 589 #define SUBSYS_ATTR_RW(_name, _mode, _show, _store) \ 590 struct device_attribute subsys_attr_##_name = \ 591 __ATTR(_name, _mode, _show, _store) 592 593 static const char *nvme_iopolicy_names[] = { 594 [NVME_IOPOLICY_NUMA] = "numa", 595 [NVME_IOPOLICY_RR] = "round-robin", 596 }; 597 598 static ssize_t nvme_subsys_iopolicy_show(struct device *dev, 599 struct device_attribute *attr, char *buf) 600 { 601 struct nvme_subsystem *subsys = 602 container_of(dev, struct nvme_subsystem, dev); 603 604 return sprintf(buf, "%s\n", 605 nvme_iopolicy_names[READ_ONCE(subsys->iopolicy)]); 606 } 607 608 static ssize_t nvme_subsys_iopolicy_store(struct device *dev, 609 struct device_attribute *attr, const char *buf, size_t count) 610 { 611 struct nvme_subsystem *subsys = 612 container_of(dev, struct nvme_subsystem, dev); 613 int i; 614 615 for (i = 0; i < ARRAY_SIZE(nvme_iopolicy_names); i++) { 616 if (sysfs_streq(buf, nvme_iopolicy_names[i])) { 617 WRITE_ONCE(subsys->iopolicy, i); 618 return count; 619 } 620 } 621 622 return -EINVAL; 623 } 624 SUBSYS_ATTR_RW(iopolicy, S_IRUGO | S_IWUSR, 625 nvme_subsys_iopolicy_show, nvme_subsys_iopolicy_store); 626 627 static ssize_t ana_grpid_show(struct device *dev, struct device_attribute *attr, 628 char *buf) 629 { 630 return sprintf(buf, "%d\n", nvme_get_ns_from_dev(dev)->ana_grpid); 631 } 632 DEVICE_ATTR_RO(ana_grpid); 633 634 static ssize_t ana_state_show(struct device *dev, struct device_attribute *attr, 635 char *buf) 636 { 637 struct nvme_ns *ns = nvme_get_ns_from_dev(dev); 638 639 return sprintf(buf, "%s\n", nvme_ana_state_names[ns->ana_state]); 640 } 641 DEVICE_ATTR_RO(ana_state); 642 643 static int nvme_lookup_ana_group_desc(struct nvme_ctrl *ctrl, 644 struct nvme_ana_group_desc *desc, void *data) 645 { 646 struct nvme_ana_group_desc *dst = data; 647 648 if (desc->grpid != dst->grpid) 649 return 0; 650 651 *dst = *desc; 652 return -ENXIO; /* just break out of the loop */ 653 } 654 655 void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id) 656 { 657 if (nvme_ctrl_use_ana(ns->ctrl)) { 658 struct nvme_ana_group_desc desc = { 659 .grpid = id->anagrpid, 660 .state = 0, 661 }; 662 663 mutex_lock(&ns->ctrl->ana_lock); 664 ns->ana_grpid = le32_to_cpu(id->anagrpid); 665 nvme_parse_ana_log(ns->ctrl, &desc, nvme_lookup_ana_group_desc); 666 mutex_unlock(&ns->ctrl->ana_lock); 667 if (desc.state) { 668 /* found the group desc: update */ 669 nvme_update_ns_ana_state(&desc, ns); 670 } 671 } else { 672 ns->ana_state = NVME_ANA_OPTIMIZED; 673 nvme_mpath_set_live(ns); 674 } 675 676 if (bdi_cap_stable_pages_required(ns->queue->backing_dev_info)) { 677 struct gendisk *disk = ns->head->disk; 678 679 if (disk) 680 disk->queue->backing_dev_info->capabilities |= 681 BDI_CAP_STABLE_WRITES; 682 } 683 } 684 685 void nvme_mpath_remove_disk(struct nvme_ns_head *head) 686 { 687 if (!head->disk) 688 return; 689 if (head->disk->flags & GENHD_FL_UP) 690 del_gendisk(head->disk); 691 blk_set_queue_dying(head->disk->queue); 692 /* make sure all pending bios are cleaned up */ 693 kblockd_schedule_work(&head->requeue_work); 694 flush_work(&head->requeue_work); 695 blk_cleanup_queue(head->disk->queue); 696 if (!test_bit(NVME_NSHEAD_DISK_LIVE, &head->flags)) { 697 /* 698 * if device_add_disk wasn't called, prevent 699 * disk release to put a bogus reference on the 700 * request queue 701 */ 702 head->disk->queue = NULL; 703 } 704 put_disk(head->disk); 705 } 706 707 int nvme_mpath_init(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id) 708 { 709 int error; 710 711 /* check if multipath is enabled and we have the capability */ 712 if (!multipath || !ctrl->subsys || 713 !(ctrl->subsys->cmic & NVME_CTRL_CMIC_ANA)) 714 return 0; 715 716 ctrl->anacap = id->anacap; 717 ctrl->anatt = id->anatt; 718 ctrl->nanagrpid = le32_to_cpu(id->nanagrpid); 719 ctrl->anagrpmax = le32_to_cpu(id->anagrpmax); 720 721 mutex_init(&ctrl->ana_lock); 722 timer_setup(&ctrl->anatt_timer, nvme_anatt_timeout, 0); 723 ctrl->ana_log_size = sizeof(struct nvme_ana_rsp_hdr) + 724 ctrl->nanagrpid * sizeof(struct nvme_ana_group_desc); 725 ctrl->ana_log_size += ctrl->max_namespaces * sizeof(__le32); 726 727 if (ctrl->ana_log_size > ctrl->max_hw_sectors << SECTOR_SHIFT) { 728 dev_err(ctrl->device, 729 "ANA log page size (%zd) larger than MDTS (%d).\n", 730 ctrl->ana_log_size, 731 ctrl->max_hw_sectors << SECTOR_SHIFT); 732 dev_err(ctrl->device, "disabling ANA support.\n"); 733 return 0; 734 } 735 736 INIT_WORK(&ctrl->ana_work, nvme_ana_work); 737 kfree(ctrl->ana_log_buf); 738 ctrl->ana_log_buf = kmalloc(ctrl->ana_log_size, GFP_KERNEL); 739 if (!ctrl->ana_log_buf) { 740 error = -ENOMEM; 741 goto out; 742 } 743 744 error = nvme_read_ana_log(ctrl); 745 if (error) 746 goto out_free_ana_log_buf; 747 return 0; 748 out_free_ana_log_buf: 749 kfree(ctrl->ana_log_buf); 750 ctrl->ana_log_buf = NULL; 751 out: 752 return error; 753 } 754 755 void nvme_mpath_uninit(struct nvme_ctrl *ctrl) 756 { 757 kfree(ctrl->ana_log_buf); 758 ctrl->ana_log_buf = NULL; 759 } 760 761