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 11static bool multipath = true; 12module_param(multipath, bool, 0444); 13MODULE_PARM_DESC(multipath, 14 "turn on native support for multiple controllers per subsystem"); 15 16void 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 26void 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 36void 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 */ 53void 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 68void 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 94void 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 106static 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 115bool 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 } 130out: 131 return changed; 132} 133 134void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl) 135{ 136 struct nvme_ns *ns; 137 138 down_read(&ctrl->namespaces_rwsem); 139 list_for_each_entry(ns, &ctrl->namespaces, list) { 140 nvme_mpath_clear_current_path(ns); 141 kblockd_schedule_work(&ns->head->requeue_work); 142 } 143 up_read(&ctrl->namespaces_rwsem); 144} 145 146static bool nvme_path_is_disabled(struct nvme_ns *ns) 147{ 148 /* 149 * We don't treat NVME_CTRL_DELETING as a disabled path as I/O should 150 * still be able to complete assuming that the controller is connected. 151 * Otherwise it will fail immediately and return to the requeue list. 152 */ 153 if (ns->ctrl->state != NVME_CTRL_LIVE && 154 ns->ctrl->state != NVME_CTRL_DELETING) 155 return true; 156 if (test_bit(NVME_NS_ANA_PENDING, &ns->flags) || 157 test_bit(NVME_NS_REMOVING, &ns->flags)) 158 return true; 159 return false; 160} 161 162static struct nvme_ns *__nvme_find_path(struct nvme_ns_head *head, int node) 163{ 164 int found_distance = INT_MAX, fallback_distance = INT_MAX, distance; 165 struct nvme_ns *found = NULL, *fallback = NULL, *ns; 166 167 list_for_each_entry_rcu(ns, &head->list, siblings) { 168 if (nvme_path_is_disabled(ns)) 169 continue; 170 171 if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_NUMA) 172 distance = node_distance(node, ns->ctrl->numa_node); 173 else 174 distance = LOCAL_DISTANCE; 175 176 switch (ns->ana_state) { 177 case NVME_ANA_OPTIMIZED: 178 if (distance < found_distance) { 179 found_distance = distance; 180 found = ns; 181 } 182 break; 183 case NVME_ANA_NONOPTIMIZED: 184 if (distance < fallback_distance) { 185 fallback_distance = distance; 186 fallback = ns; 187 } 188 break; 189 default: 190 break; 191 } 192 } 193 194 if (!found) 195 found = fallback; 196 if (found) 197 rcu_assign_pointer(head->current_path[node], found); 198 return found; 199} 200 201static struct nvme_ns *nvme_next_ns(struct nvme_ns_head *head, 202 struct nvme_ns *ns) 203{ 204 ns = list_next_or_null_rcu(&head->list, &ns->siblings, struct nvme_ns, 205 siblings); 206 if (ns) 207 return ns; 208 return list_first_or_null_rcu(&head->list, struct nvme_ns, siblings); 209} 210 211static struct nvme_ns *nvme_round_robin_path(struct nvme_ns_head *head, 212 int node, struct nvme_ns *old) 213{ 214 struct nvme_ns *ns, *found = NULL; 215 216 if (list_is_singular(&head->list)) { 217 if (nvme_path_is_disabled(old)) 218 return NULL; 219 return old; 220 } 221 222 for (ns = nvme_next_ns(head, old); 223 ns && ns != old; 224 ns = nvme_next_ns(head, ns)) { 225 if (nvme_path_is_disabled(ns)) 226 continue; 227 228 if (ns->ana_state == NVME_ANA_OPTIMIZED) { 229 found = ns; 230 goto out; 231 } 232 if (ns->ana_state == NVME_ANA_NONOPTIMIZED) 233 found = ns; 234 } 235 236 /* 237 * The loop above skips the current path for round-robin semantics. 238 * Fall back to the current path if either: 239 * - no other optimized path found and current is optimized, 240 * - no other usable path found and current is usable. 241 */ 242 if (!nvme_path_is_disabled(old) && 243 (old->ana_state == NVME_ANA_OPTIMIZED || 244 (!found && old->ana_state == NVME_ANA_NONOPTIMIZED))) 245 return old; 246 247 if (!found) 248 return NULL; 249out: 250 rcu_assign_pointer(head->current_path[node], found); 251 return found; 252} 253 254static inline bool nvme_path_is_optimized(struct nvme_ns *ns) 255{ 256 return ns->ctrl->state == NVME_CTRL_LIVE && 257 ns->ana_state == NVME_ANA_OPTIMIZED; 258} 259 260inline struct nvme_ns *nvme_find_path(struct nvme_ns_head *head) 261{ 262 int node = numa_node_id(); 263 struct nvme_ns *ns; 264 265 ns = srcu_dereference(head->current_path[node], &head->srcu); 266 if (unlikely(!ns)) 267 return __nvme_find_path(head, node); 268 269 if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR) 270 return nvme_round_robin_path(head, node, ns); 271 if (unlikely(!nvme_path_is_optimized(ns))) 272 return __nvme_find_path(head, node); 273 return ns; 274} 275 276static bool nvme_available_path(struct nvme_ns_head *head) 277{ 278 struct nvme_ns *ns; 279 280 list_for_each_entry_rcu(ns, &head->list, siblings) { 281 switch (ns->ctrl->state) { 282 case NVME_CTRL_LIVE: 283 case NVME_CTRL_RESETTING: 284 case NVME_CTRL_CONNECTING: 285 /* fallthru */ 286 return true; 287 default: 288 break; 289 } 290 } 291 return false; 292} 293 294blk_qc_t nvme_ns_head_submit_bio(struct bio *bio) 295{ 296 struct nvme_ns_head *head = bio->bi_disk->private_data; 297 struct device *dev = disk_to_dev(head->disk); 298 struct nvme_ns *ns; 299 blk_qc_t ret = BLK_QC_T_NONE; 300 int srcu_idx; 301 302 /* 303 * The namespace might be going away and the bio might be moved to a 304 * different queue via blk_steal_bios(), so we need to use the bio_split 305 * pool from the original queue to allocate the bvecs from. 306 */ 307 blk_queue_split(&bio); 308 309 srcu_idx = srcu_read_lock(&head->srcu); 310 ns = nvme_find_path(head); 311 if (likely(ns)) { 312 bio->bi_disk = ns->disk; 313 bio->bi_opf |= REQ_NVME_MPATH; 314 trace_block_bio_remap(bio->bi_disk->queue, bio, 315 disk_devt(ns->head->disk), 316 bio->bi_iter.bi_sector); 317 ret = submit_bio_noacct(bio); 318 } else if (nvme_available_path(head)) { 319 dev_warn_ratelimited(dev, "no usable path - requeuing I/O\n"); 320 321 spin_lock_irq(&head->requeue_lock); 322 bio_list_add(&head->requeue_list, bio); 323 spin_unlock_irq(&head->requeue_lock); 324 } else { 325 dev_warn_ratelimited(dev, "no available path - failing I/O\n"); 326 327 bio->bi_status = BLK_STS_IOERR; 328 bio_endio(bio); 329 } 330 331 srcu_read_unlock(&head->srcu, srcu_idx); 332 return ret; 333} 334 335static void nvme_requeue_work(struct work_struct *work) 336{ 337 struct nvme_ns_head *head = 338 container_of(work, struct nvme_ns_head, requeue_work); 339 struct bio *bio, *next; 340 341 spin_lock_irq(&head->requeue_lock); 342 next = bio_list_get(&head->requeue_list); 343 spin_unlock_irq(&head->requeue_lock); 344 345 while ((bio = next) != NULL) { 346 next = bio->bi_next; 347 bio->bi_next = NULL; 348 349 /* 350 * Reset disk to the mpath node and resubmit to select a new 351 * path. 352 */ 353 bio->bi_disk = head->disk; 354 submit_bio_noacct(bio); 355 } 356} 357 358int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head) 359{ 360 struct request_queue *q; 361 bool vwc = false; 362 363 mutex_init(&head->lock); 364 bio_list_init(&head->requeue_list); 365 spin_lock_init(&head->requeue_lock); 366 INIT_WORK(&head->requeue_work, nvme_requeue_work); 367 368 /* 369 * Add a multipath node if the subsystems supports multiple controllers. 370 * We also do this for private namespaces as the namespace sharing data could 371 * change after a rescan. 372 */ 373 if (!(ctrl->subsys->cmic & NVME_CTRL_CMIC_MULTI_CTRL) || !multipath) 374 return 0; 375 376 q = blk_alloc_queue(ctrl->numa_node); 377 if (!q) 378 goto out; 379 blk_queue_flag_set(QUEUE_FLAG_NONROT, q); 380 /* set to a default value for 512 until disk is validated */ 381 blk_queue_logical_block_size(q, 512); 382 blk_set_stacking_limits(&q->limits); 383 384 /* we need to propagate up the VMC settings */ 385 if (ctrl->vwc & NVME_CTRL_VWC_PRESENT) 386 vwc = true; 387 blk_queue_write_cache(q, vwc, vwc); 388 389 head->disk = alloc_disk(0); 390 if (!head->disk) 391 goto out_cleanup_queue; 392 head->disk->fops = &nvme_ns_head_ops; 393 head->disk->private_data = head; 394 head->disk->queue = q; 395 head->disk->flags = GENHD_FL_EXT_DEVT; 396 sprintf(head->disk->disk_name, "nvme%dn%d", 397 ctrl->subsys->instance, head->instance); 398 return 0; 399 400out_cleanup_queue: 401 blk_cleanup_queue(q); 402out: 403 return -ENOMEM; 404} 405 406static void nvme_mpath_set_live(struct nvme_ns *ns) 407{ 408 struct nvme_ns_head *head = ns->head; 409 410 if (!head->disk) 411 return; 412 413 if (!test_and_set_bit(NVME_NSHEAD_DISK_LIVE, &head->flags)) 414 device_add_disk(&head->subsys->dev, head->disk, 415 nvme_ns_id_attr_groups); 416 417 mutex_lock(&head->lock); 418 if (nvme_path_is_optimized(ns)) { 419 int node, srcu_idx; 420 421 srcu_idx = srcu_read_lock(&head->srcu); 422 for_each_node(node) 423 __nvme_find_path(head, node); 424 srcu_read_unlock(&head->srcu, srcu_idx); 425 } 426 mutex_unlock(&head->lock); 427 428 synchronize_srcu(&head->srcu); 429 kblockd_schedule_work(&head->requeue_work); 430} 431 432static int nvme_parse_ana_log(struct nvme_ctrl *ctrl, void *data, 433 int (*cb)(struct nvme_ctrl *ctrl, struct nvme_ana_group_desc *, 434 void *)) 435{ 436 void *base = ctrl->ana_log_buf; 437 size_t offset = sizeof(struct nvme_ana_rsp_hdr); 438 int error, i; 439 440 lockdep_assert_held(&ctrl->ana_lock); 441 442 for (i = 0; i < le16_to_cpu(ctrl->ana_log_buf->ngrps); i++) { 443 struct nvme_ana_group_desc *desc = base + offset; 444 u32 nr_nsids; 445 size_t nsid_buf_size; 446 447 if (WARN_ON_ONCE(offset > ctrl->ana_log_size - sizeof(*desc))) 448 return -EINVAL; 449 450 nr_nsids = le32_to_cpu(desc->nnsids); 451 nsid_buf_size = nr_nsids * sizeof(__le32); 452 453 if (WARN_ON_ONCE(desc->grpid == 0)) 454 return -EINVAL; 455 if (WARN_ON_ONCE(le32_to_cpu(desc->grpid) > ctrl->anagrpmax)) 456 return -EINVAL; 457 if (WARN_ON_ONCE(desc->state == 0)) 458 return -EINVAL; 459 if (WARN_ON_ONCE(desc->state > NVME_ANA_CHANGE)) 460 return -EINVAL; 461 462 offset += sizeof(*desc); 463 if (WARN_ON_ONCE(offset > ctrl->ana_log_size - nsid_buf_size)) 464 return -EINVAL; 465 466 error = cb(ctrl, desc, data); 467 if (error) 468 return error; 469 470 offset += nsid_buf_size; 471 } 472 473 return 0; 474} 475 476static inline bool nvme_state_is_live(enum nvme_ana_state state) 477{ 478 return state == NVME_ANA_OPTIMIZED || state == NVME_ANA_NONOPTIMIZED; 479} 480 481static void nvme_update_ns_ana_state(struct nvme_ana_group_desc *desc, 482 struct nvme_ns *ns) 483{ 484 ns->ana_grpid = le32_to_cpu(desc->grpid); 485 ns->ana_state = desc->state; 486 clear_bit(NVME_NS_ANA_PENDING, &ns->flags); 487 /* 488 * nvme_mpath_set_live() will trigger I/O to the multipath path device 489 * and in turn to this path device. However we cannot accept this I/O 490 * if the controller is not live. This may deadlock if called from 491 * nvme_mpath_init_identify() and the ctrl will never complete 492 * initialization, preventing I/O from completing. For this case we 493 * will reprocess the ANA log page in nvme_mpath_update() once the 494 * controller is ready. 495 */ 496 if (nvme_state_is_live(ns->ana_state) && 497 ns->ctrl->state == NVME_CTRL_LIVE) 498 nvme_mpath_set_live(ns); 499} 500 501static int nvme_update_ana_state(struct nvme_ctrl *ctrl, 502 struct nvme_ana_group_desc *desc, void *data) 503{ 504 u32 nr_nsids = le32_to_cpu(desc->nnsids), n = 0; 505 unsigned *nr_change_groups = data; 506 struct nvme_ns *ns; 507 508 dev_dbg(ctrl->device, "ANA group %d: %s.\n", 509 le32_to_cpu(desc->grpid), 510 nvme_ana_state_names[desc->state]); 511 512 if (desc->state == NVME_ANA_CHANGE) 513 (*nr_change_groups)++; 514 515 if (!nr_nsids) 516 return 0; 517 518 down_read(&ctrl->namespaces_rwsem); 519 list_for_each_entry(ns, &ctrl->namespaces, list) { 520 unsigned nsid; 521again: 522 nsid = le32_to_cpu(desc->nsids[n]); 523 if (ns->head->ns_id < nsid) 524 continue; 525 if (ns->head->ns_id == nsid) 526 nvme_update_ns_ana_state(desc, ns); 527 if (++n == nr_nsids) 528 break; 529 if (ns->head->ns_id > nsid) 530 goto again; 531 } 532 up_read(&ctrl->namespaces_rwsem); 533 return 0; 534} 535 536static int nvme_read_ana_log(struct nvme_ctrl *ctrl) 537{ 538 u32 nr_change_groups = 0; 539 int error; 540 541 mutex_lock(&ctrl->ana_lock); 542 error = nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_ANA, 0, NVME_CSI_NVM, 543 ctrl->ana_log_buf, ctrl->ana_log_size, 0); 544 if (error) { 545 dev_warn(ctrl->device, "Failed to get ANA log: %d\n", error); 546 goto out_unlock; 547 } 548 549 error = nvme_parse_ana_log(ctrl, &nr_change_groups, 550 nvme_update_ana_state); 551 if (error) 552 goto out_unlock; 553 554 /* 555 * In theory we should have an ANATT timer per group as they might enter 556 * the change state at different times. But that is a lot of overhead 557 * just to protect against a target that keeps entering new changes 558 * states while never finishing previous ones. But we'll still 559 * eventually time out once all groups are in change state, so this 560 * isn't a big deal. 561 * 562 * We also double the ANATT value to provide some slack for transports 563 * or AEN processing overhead. 564 */ 565 if (nr_change_groups) 566 mod_timer(&ctrl->anatt_timer, ctrl->anatt * HZ * 2 + jiffies); 567 else 568 del_timer_sync(&ctrl->anatt_timer); 569out_unlock: 570 mutex_unlock(&ctrl->ana_lock); 571 return error; 572} 573 574static void nvme_ana_work(struct work_struct *work) 575{ 576 struct nvme_ctrl *ctrl = container_of(work, struct nvme_ctrl, ana_work); 577 578 if (ctrl->state != NVME_CTRL_LIVE) 579 return; 580 581 nvme_read_ana_log(ctrl); 582} 583 584void nvme_mpath_update(struct nvme_ctrl *ctrl) 585{ 586 u32 nr_change_groups = 0; 587 588 if (!ctrl->ana_log_buf) 589 return; 590 591 mutex_lock(&ctrl->ana_lock); 592 nvme_parse_ana_log(ctrl, &nr_change_groups, nvme_update_ana_state); 593 mutex_unlock(&ctrl->ana_lock); 594} 595 596static void nvme_anatt_timeout(struct timer_list *t) 597{ 598 struct nvme_ctrl *ctrl = from_timer(ctrl, t, anatt_timer); 599 600 dev_info(ctrl->device, "ANATT timeout, resetting controller.\n"); 601 nvme_reset_ctrl(ctrl); 602} 603 604void nvme_mpath_stop(struct nvme_ctrl *ctrl) 605{ 606 if (!nvme_ctrl_use_ana(ctrl)) 607 return; 608 del_timer_sync(&ctrl->anatt_timer); 609 cancel_work_sync(&ctrl->ana_work); 610} 611 612#define SUBSYS_ATTR_RW(_name, _mode, _show, _store) \ 613 struct device_attribute subsys_attr_##_name = \ 614 __ATTR(_name, _mode, _show, _store) 615 616static const char *nvme_iopolicy_names[] = { 617 [NVME_IOPOLICY_NUMA] = "numa", 618 [NVME_IOPOLICY_RR] = "round-robin", 619}; 620 621static ssize_t nvme_subsys_iopolicy_show(struct device *dev, 622 struct device_attribute *attr, char *buf) 623{ 624 struct nvme_subsystem *subsys = 625 container_of(dev, struct nvme_subsystem, dev); 626 627 return sysfs_emit(buf, "%s\n", 628 nvme_iopolicy_names[READ_ONCE(subsys->iopolicy)]); 629} 630 631static ssize_t nvme_subsys_iopolicy_store(struct device *dev, 632 struct device_attribute *attr, const char *buf, size_t count) 633{ 634 struct nvme_subsystem *subsys = 635 container_of(dev, struct nvme_subsystem, dev); 636 int i; 637 638 for (i = 0; i < ARRAY_SIZE(nvme_iopolicy_names); i++) { 639 if (sysfs_streq(buf, nvme_iopolicy_names[i])) { 640 WRITE_ONCE(subsys->iopolicy, i); 641 return count; 642 } 643 } 644 645 return -EINVAL; 646} 647SUBSYS_ATTR_RW(iopolicy, S_IRUGO | S_IWUSR, 648 nvme_subsys_iopolicy_show, nvme_subsys_iopolicy_store); 649 650static ssize_t ana_grpid_show(struct device *dev, struct device_attribute *attr, 651 char *buf) 652{ 653 return sysfs_emit(buf, "%d\n", nvme_get_ns_from_dev(dev)->ana_grpid); 654} 655DEVICE_ATTR_RO(ana_grpid); 656 657static ssize_t ana_state_show(struct device *dev, struct device_attribute *attr, 658 char *buf) 659{ 660 struct nvme_ns *ns = nvme_get_ns_from_dev(dev); 661 662 return sysfs_emit(buf, "%s\n", nvme_ana_state_names[ns->ana_state]); 663} 664DEVICE_ATTR_RO(ana_state); 665 666static int nvme_lookup_ana_group_desc(struct nvme_ctrl *ctrl, 667 struct nvme_ana_group_desc *desc, void *data) 668{ 669 struct nvme_ana_group_desc *dst = data; 670 671 if (desc->grpid != dst->grpid) 672 return 0; 673 674 *dst = *desc; 675 return -ENXIO; /* just break out of the loop */ 676} 677 678void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id) 679{ 680 if (nvme_ctrl_use_ana(ns->ctrl)) { 681 struct nvme_ana_group_desc desc = { 682 .grpid = id->anagrpid, 683 .state = 0, 684 }; 685 686 mutex_lock(&ns->ctrl->ana_lock); 687 ns->ana_grpid = le32_to_cpu(id->anagrpid); 688 nvme_parse_ana_log(ns->ctrl, &desc, nvme_lookup_ana_group_desc); 689 mutex_unlock(&ns->ctrl->ana_lock); 690 if (desc.state) { 691 /* found the group desc: update */ 692 nvme_update_ns_ana_state(&desc, ns); 693 } else { 694 /* group desc not found: trigger a re-read */ 695 set_bit(NVME_NS_ANA_PENDING, &ns->flags); 696 queue_work(nvme_wq, &ns->ctrl->ana_work); 697 } 698 } else { 699 ns->ana_state = NVME_ANA_OPTIMIZED; 700 nvme_mpath_set_live(ns); 701 } 702 703 if (blk_queue_stable_writes(ns->queue) && ns->head->disk) 704 blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, 705 ns->head->disk->queue); 706#ifdef CONFIG_BLK_DEV_ZONED 707 if (blk_queue_is_zoned(ns->queue) && ns->head->disk) 708 ns->head->disk->queue->nr_zones = ns->queue->nr_zones; 709#endif 710} 711 712void nvme_mpath_remove_disk(struct nvme_ns_head *head) 713{ 714 if (!head->disk) 715 return; 716 if (head->disk->flags & GENHD_FL_UP) 717 del_gendisk(head->disk); 718 blk_set_queue_dying(head->disk->queue); 719 /* make sure all pending bios are cleaned up */ 720 kblockd_schedule_work(&head->requeue_work); 721 flush_work(&head->requeue_work); 722 blk_cleanup_queue(head->disk->queue); 723 if (!test_bit(NVME_NSHEAD_DISK_LIVE, &head->flags)) { 724 /* 725 * if device_add_disk wasn't called, prevent 726 * disk release to put a bogus reference on the 727 * request queue 728 */ 729 head->disk->queue = NULL; 730 } 731 put_disk(head->disk); 732} 733 734void nvme_mpath_init_ctrl(struct nvme_ctrl *ctrl) 735{ 736 mutex_init(&ctrl->ana_lock); 737 timer_setup(&ctrl->anatt_timer, nvme_anatt_timeout, 0); 738 INIT_WORK(&ctrl->ana_work, nvme_ana_work); 739} 740 741int nvme_mpath_init_identify(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id) 742{ 743 size_t max_transfer_size = ctrl->max_hw_sectors << SECTOR_SHIFT; 744 size_t ana_log_size; 745 int error = 0; 746 747 /* check if multipath is enabled and we have the capability */ 748 if (!multipath || !ctrl->subsys || 749 !(ctrl->subsys->cmic & NVME_CTRL_CMIC_ANA)) 750 return 0; 751 752 ctrl->anacap = id->anacap; 753 ctrl->anatt = id->anatt; 754 ctrl->nanagrpid = le32_to_cpu(id->nanagrpid); 755 ctrl->anagrpmax = le32_to_cpu(id->anagrpmax); 756 757 ana_log_size = sizeof(struct nvme_ana_rsp_hdr) + 758 ctrl->nanagrpid * sizeof(struct nvme_ana_group_desc) + 759 ctrl->max_namespaces * sizeof(__le32); 760 if (ana_log_size > max_transfer_size) { 761 dev_err(ctrl->device, 762 "ANA log page size (%zd) larger than MDTS (%zd).\n", 763 ana_log_size, max_transfer_size); 764 dev_err(ctrl->device, "disabling ANA support.\n"); 765 goto out_uninit; 766 } 767 if (ana_log_size > ctrl->ana_log_size) { 768 nvme_mpath_stop(ctrl); 769 kfree(ctrl->ana_log_buf); 770 ctrl->ana_log_buf = kmalloc(ana_log_size, GFP_KERNEL); 771 if (!ctrl->ana_log_buf) 772 return -ENOMEM; 773 } 774 ctrl->ana_log_size = ana_log_size; 775 error = nvme_read_ana_log(ctrl); 776 if (error) 777 goto out_uninit; 778 return 0; 779 780out_uninit: 781 nvme_mpath_uninit(ctrl); 782 return error; 783} 784 785void nvme_mpath_uninit(struct nvme_ctrl *ctrl) 786{ 787 kfree(ctrl->ana_log_buf); 788 ctrl->ana_log_buf = NULL; 789} 790 791