2 * NVM Express device driver
3 * Copyright (c) 2011-2014, Intel Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 #include <linux/blkdev.h>
16 #include <linux/blk-mq.h>
17 #include <linux/delay.h>
18 #include <linux/errno.h>
19 #include <linux/hdreg.h>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/list_sort.h>
23 #include <linux/slab.h>
24 #include <linux/types.h>
26 #include <linux/ptrace.h>
27 #include <linux/nvme_ioctl.h>
28 #include <linux/t10-pi.h>
29 #include <linux/pm_qos.h>
30 #include <asm/unaligned.h>
32 #define CREATE_TRACE_POINTS
38 #define NVME_MINORS (1U << MINORBITS)
40 unsigned int admin_timeout = 60;
41 module_param(admin_timeout, uint, 0644);
42 MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands");
43 EXPORT_SYMBOL_GPL(admin_timeout);
45 unsigned int nvme_io_timeout = 30;
46 module_param_named(io_timeout, nvme_io_timeout, uint, 0644);
47 MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O");
48 EXPORT_SYMBOL_GPL(nvme_io_timeout);
50 static unsigned char shutdown_timeout = 5;
51 module_param(shutdown_timeout, byte, 0644);
52 MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown");
54 static u8 nvme_max_retries = 5;
55 module_param_named(max_retries, nvme_max_retries, byte, 0644);
56 MODULE_PARM_DESC(max_retries, "max number of retries a command may have");
58 static unsigned long default_ps_max_latency_us = 100000;
59 module_param(default_ps_max_latency_us, ulong, 0644);
60 MODULE_PARM_DESC(default_ps_max_latency_us,
61 "max power saving latency for new devices; use PM QOS to change per device");
63 static bool force_apst;
64 module_param(force_apst, bool, 0644);
65 MODULE_PARM_DESC(force_apst, "allow APST for newly enumerated devices even if quirked off");
68 module_param(streams, bool, 0644);
69 MODULE_PARM_DESC(streams, "turn on support for Streams write directives");
72 * nvme_wq - hosts nvme related works that are not reset or delete
73 * nvme_reset_wq - hosts nvme reset works
74 * nvme_delete_wq - hosts nvme delete works
76 * nvme_wq will host works such are scan, aen handling, fw activation,
77 * keep-alive error recovery, periodic reconnects etc. nvme_reset_wq
78 * runs reset works which also flush works hosted on nvme_wq for
79 * serialization purposes. nvme_delete_wq host controller deletion
80 * works which flush reset works for serialization.
82 struct workqueue_struct *nvme_wq;
83 EXPORT_SYMBOL_GPL(nvme_wq);
85 struct workqueue_struct *nvme_reset_wq;
86 EXPORT_SYMBOL_GPL(nvme_reset_wq);
88 struct workqueue_struct *nvme_delete_wq;
89 EXPORT_SYMBOL_GPL(nvme_delete_wq);
91 static DEFINE_IDA(nvme_subsystems_ida);
92 static LIST_HEAD(nvme_subsystems);
93 static DEFINE_MUTEX(nvme_subsystems_lock);
95 static DEFINE_IDA(nvme_instance_ida);
96 static dev_t nvme_chr_devt;
97 static struct class *nvme_class;
98 static struct class *nvme_subsys_class;
100 static void nvme_ns_remove(struct nvme_ns *ns);
101 static int nvme_revalidate_disk(struct gendisk *disk);
102 static void nvme_put_subsystem(struct nvme_subsystem *subsys);
103 static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl,
106 static void nvme_set_queue_dying(struct nvme_ns *ns)
109 * Revalidating a dead namespace sets capacity to 0. This will end
110 * buffered writers dirtying pages that can't be synced.
112 if (!ns->disk || test_and_set_bit(NVME_NS_DEAD, &ns->flags))
114 blk_set_queue_dying(ns->queue);
115 /* Forcibly unquiesce queues to avoid blocking dispatch */
116 blk_mq_unquiesce_queue(ns->queue);
118 * Revalidate after unblocking dispatchers that may be holding bd_butex
120 revalidate_disk(ns->disk);
123 static void nvme_queue_scan(struct nvme_ctrl *ctrl)
126 * Only new queue scan work when admin and IO queues are both alive
128 if (ctrl->state == NVME_CTRL_LIVE)
129 queue_work(nvme_wq, &ctrl->scan_work);
132 int nvme_reset_ctrl(struct nvme_ctrl *ctrl)
134 if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING))
136 if (!queue_work(nvme_reset_wq, &ctrl->reset_work))
140 EXPORT_SYMBOL_GPL(nvme_reset_ctrl);
142 int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl)
146 ret = nvme_reset_ctrl(ctrl);
148 flush_work(&ctrl->reset_work);
149 if (ctrl->state != NVME_CTRL_LIVE &&
150 ctrl->state != NVME_CTRL_ADMIN_ONLY)
156 EXPORT_SYMBOL_GPL(nvme_reset_ctrl_sync);
158 static void nvme_delete_ctrl_work(struct work_struct *work)
160 struct nvme_ctrl *ctrl =
161 container_of(work, struct nvme_ctrl, delete_work);
163 dev_info(ctrl->device,
164 "Removing ctrl: NQN \"%s\"\n", ctrl->opts->subsysnqn);
166 flush_work(&ctrl->reset_work);
167 nvme_stop_ctrl(ctrl);
168 nvme_remove_namespaces(ctrl);
169 ctrl->ops->delete_ctrl(ctrl);
170 nvme_uninit_ctrl(ctrl);
174 int nvme_delete_ctrl(struct nvme_ctrl *ctrl)
176 if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING))
178 if (!queue_work(nvme_delete_wq, &ctrl->delete_work))
182 EXPORT_SYMBOL_GPL(nvme_delete_ctrl);
184 int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl)
189 * Keep a reference until the work is flushed since ->delete_ctrl
190 * can free the controller.
193 ret = nvme_delete_ctrl(ctrl);
195 flush_work(&ctrl->delete_work);
199 EXPORT_SYMBOL_GPL(nvme_delete_ctrl_sync);
201 static inline bool nvme_ns_has_pi(struct nvme_ns *ns)
203 return ns->pi_type && ns->ms == sizeof(struct t10_pi_tuple);
206 static blk_status_t nvme_error_status(struct request *req)
208 switch (nvme_req(req)->status & 0x7ff) {
209 case NVME_SC_SUCCESS:
211 case NVME_SC_CAP_EXCEEDED:
212 return BLK_STS_NOSPC;
213 case NVME_SC_LBA_RANGE:
214 return BLK_STS_TARGET;
215 case NVME_SC_BAD_ATTRIBUTES:
216 case NVME_SC_ONCS_NOT_SUPPORTED:
217 case NVME_SC_INVALID_OPCODE:
218 case NVME_SC_INVALID_FIELD:
219 case NVME_SC_INVALID_NS:
220 return BLK_STS_NOTSUPP;
221 case NVME_SC_WRITE_FAULT:
222 case NVME_SC_READ_ERROR:
223 case NVME_SC_UNWRITTEN_BLOCK:
224 case NVME_SC_ACCESS_DENIED:
225 case NVME_SC_READ_ONLY:
226 case NVME_SC_COMPARE_FAILED:
227 return BLK_STS_MEDIUM;
228 case NVME_SC_GUARD_CHECK:
229 case NVME_SC_APPTAG_CHECK:
230 case NVME_SC_REFTAG_CHECK:
231 case NVME_SC_INVALID_PI:
232 return BLK_STS_PROTECTION;
233 case NVME_SC_RESERVATION_CONFLICT:
234 return BLK_STS_NEXUS;
236 return BLK_STS_IOERR;
240 static inline bool nvme_req_needs_retry(struct request *req)
242 if (blk_noretry_request(req))
244 if (nvme_req(req)->status & NVME_SC_DNR)
246 if (nvme_req(req)->retries >= nvme_max_retries)
251 void nvme_complete_rq(struct request *req)
253 blk_status_t status = nvme_error_status(req);
255 trace_nvme_complete_rq(req);
257 if (unlikely(status != BLK_STS_OK && nvme_req_needs_retry(req))) {
258 if ((req->cmd_flags & REQ_NVME_MPATH) && nvme_failover_req(req))
261 if (!blk_queue_dying(req->q)) {
262 nvme_req(req)->retries++;
263 blk_mq_requeue_request(req, true);
267 blk_mq_end_request(req, status);
269 EXPORT_SYMBOL_GPL(nvme_complete_rq);
271 void nvme_cancel_request(struct request *req, void *data, bool reserved)
273 dev_dbg_ratelimited(((struct nvme_ctrl *) data)->device,
274 "Cancelling I/O %d", req->tag);
276 nvme_req(req)->status = NVME_SC_ABORT_REQ;
277 blk_mq_complete_request(req);
280 EXPORT_SYMBOL_GPL(nvme_cancel_request);
282 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
283 enum nvme_ctrl_state new_state)
285 enum nvme_ctrl_state old_state;
287 bool changed = false;
289 spin_lock_irqsave(&ctrl->lock, flags);
291 old_state = ctrl->state;
293 case NVME_CTRL_ADMIN_ONLY:
295 case NVME_CTRL_CONNECTING:
305 case NVME_CTRL_RESETTING:
306 case NVME_CTRL_CONNECTING:
313 case NVME_CTRL_RESETTING:
317 case NVME_CTRL_ADMIN_ONLY:
324 case NVME_CTRL_CONNECTING:
327 case NVME_CTRL_RESETTING:
334 case NVME_CTRL_DELETING:
337 case NVME_CTRL_ADMIN_ONLY:
338 case NVME_CTRL_RESETTING:
339 case NVME_CTRL_CONNECTING:
348 case NVME_CTRL_DELETING:
360 ctrl->state = new_state;
362 spin_unlock_irqrestore(&ctrl->lock, flags);
363 if (changed && ctrl->state == NVME_CTRL_LIVE)
364 nvme_kick_requeue_lists(ctrl);
367 EXPORT_SYMBOL_GPL(nvme_change_ctrl_state);
369 static void nvme_free_ns_head(struct kref *ref)
371 struct nvme_ns_head *head =
372 container_of(ref, struct nvme_ns_head, ref);
374 nvme_mpath_remove_disk(head);
375 ida_simple_remove(&head->subsys->ns_ida, head->instance);
376 list_del_init(&head->entry);
377 cleanup_srcu_struct_quiesced(&head->srcu);
378 nvme_put_subsystem(head->subsys);
382 static void nvme_put_ns_head(struct nvme_ns_head *head)
384 kref_put(&head->ref, nvme_free_ns_head);
387 static void nvme_free_ns(struct kref *kref)
389 struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref);
392 nvme_nvm_unregister(ns);
395 nvme_put_ns_head(ns->head);
396 nvme_put_ctrl(ns->ctrl);
400 static void nvme_put_ns(struct nvme_ns *ns)
402 kref_put(&ns->kref, nvme_free_ns);
405 static inline void nvme_clear_nvme_request(struct request *req)
407 if (!(req->rq_flags & RQF_DONTPREP)) {
408 nvme_req(req)->retries = 0;
409 nvme_req(req)->flags = 0;
410 req->rq_flags |= RQF_DONTPREP;
414 struct request *nvme_alloc_request(struct request_queue *q,
415 struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid)
417 unsigned op = nvme_is_write(cmd) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN;
420 if (qid == NVME_QID_ANY) {
421 req = blk_mq_alloc_request(q, op, flags);
423 req = blk_mq_alloc_request_hctx(q, op, flags,
429 req->cmd_flags |= REQ_FAILFAST_DRIVER;
430 nvme_clear_nvme_request(req);
431 nvme_req(req)->cmd = cmd;
435 EXPORT_SYMBOL_GPL(nvme_alloc_request);
437 static int nvme_toggle_streams(struct nvme_ctrl *ctrl, bool enable)
439 struct nvme_command c;
441 memset(&c, 0, sizeof(c));
443 c.directive.opcode = nvme_admin_directive_send;
444 c.directive.nsid = cpu_to_le32(NVME_NSID_ALL);
445 c.directive.doper = NVME_DIR_SND_ID_OP_ENABLE;
446 c.directive.dtype = NVME_DIR_IDENTIFY;
447 c.directive.tdtype = NVME_DIR_STREAMS;
448 c.directive.endir = enable ? NVME_DIR_ENDIR : 0;
450 return nvme_submit_sync_cmd(ctrl->admin_q, &c, NULL, 0);
453 static int nvme_disable_streams(struct nvme_ctrl *ctrl)
455 return nvme_toggle_streams(ctrl, false);
458 static int nvme_enable_streams(struct nvme_ctrl *ctrl)
460 return nvme_toggle_streams(ctrl, true);
463 static int nvme_get_stream_params(struct nvme_ctrl *ctrl,
464 struct streams_directive_params *s, u32 nsid)
466 struct nvme_command c;
468 memset(&c, 0, sizeof(c));
469 memset(s, 0, sizeof(*s));
471 c.directive.opcode = nvme_admin_directive_recv;
472 c.directive.nsid = cpu_to_le32(nsid);
473 c.directive.numd = cpu_to_le32((sizeof(*s) >> 2) - 1);
474 c.directive.doper = NVME_DIR_RCV_ST_OP_PARAM;
475 c.directive.dtype = NVME_DIR_STREAMS;
477 return nvme_submit_sync_cmd(ctrl->admin_q, &c, s, sizeof(*s));
480 static int nvme_configure_directives(struct nvme_ctrl *ctrl)
482 struct streams_directive_params s;
485 if (!(ctrl->oacs & NVME_CTRL_OACS_DIRECTIVES))
490 ret = nvme_enable_streams(ctrl);
494 ret = nvme_get_stream_params(ctrl, &s, NVME_NSID_ALL);
498 ctrl->nssa = le16_to_cpu(s.nssa);
499 if (ctrl->nssa < BLK_MAX_WRITE_HINTS - 1) {
500 dev_info(ctrl->device, "too few streams (%u) available\n",
502 nvme_disable_streams(ctrl);
506 ctrl->nr_streams = min_t(unsigned, ctrl->nssa, BLK_MAX_WRITE_HINTS - 1);
507 dev_info(ctrl->device, "Using %u streams\n", ctrl->nr_streams);
512 * Check if 'req' has a write hint associated with it. If it does, assign
513 * a valid namespace stream to the write.
515 static void nvme_assign_write_stream(struct nvme_ctrl *ctrl,
516 struct request *req, u16 *control,
519 enum rw_hint streamid = req->write_hint;
521 if (streamid == WRITE_LIFE_NOT_SET || streamid == WRITE_LIFE_NONE)
525 if (WARN_ON_ONCE(streamid > ctrl->nr_streams))
528 *control |= NVME_RW_DTYPE_STREAMS;
529 *dsmgmt |= streamid << 16;
532 if (streamid < ARRAY_SIZE(req->q->write_hints))
533 req->q->write_hints[streamid] += blk_rq_bytes(req) >> 9;
536 static inline void nvme_setup_flush(struct nvme_ns *ns,
537 struct nvme_command *cmnd)
539 memset(cmnd, 0, sizeof(*cmnd));
540 cmnd->common.opcode = nvme_cmd_flush;
541 cmnd->common.nsid = cpu_to_le32(ns->head->ns_id);
544 static blk_status_t nvme_setup_discard(struct nvme_ns *ns, struct request *req,
545 struct nvme_command *cmnd)
547 unsigned short segments = blk_rq_nr_discard_segments(req), n = 0;
548 struct nvme_dsm_range *range;
552 * Some devices do not consider the DSM 'Number of Ranges' field when
553 * determining how much data to DMA. Always allocate memory for maximum
554 * number of segments to prevent device reading beyond end of buffer.
556 static const size_t alloc_size = sizeof(*range) * NVME_DSM_MAX_RANGES;
558 range = kzalloc(alloc_size, GFP_ATOMIC | __GFP_NOWARN);
561 * If we fail allocation our range, fallback to the controller
562 * discard page. If that's also busy, it's safe to return
563 * busy, as we know we can make progress once that's freed.
565 if (test_and_set_bit_lock(0, &ns->ctrl->discard_page_busy))
566 return BLK_STS_RESOURCE;
568 range = page_address(ns->ctrl->discard_page);
571 __rq_for_each_bio(bio, req) {
572 u64 slba = nvme_block_nr(ns, bio->bi_iter.bi_sector);
573 u32 nlb = bio->bi_iter.bi_size >> ns->lba_shift;
576 range[n].cattr = cpu_to_le32(0);
577 range[n].nlb = cpu_to_le32(nlb);
578 range[n].slba = cpu_to_le64(slba);
583 if (WARN_ON_ONCE(n != segments)) {
584 if (virt_to_page(range) == ns->ctrl->discard_page)
585 clear_bit_unlock(0, &ns->ctrl->discard_page_busy);
588 return BLK_STS_IOERR;
591 memset(cmnd, 0, sizeof(*cmnd));
592 cmnd->dsm.opcode = nvme_cmd_dsm;
593 cmnd->dsm.nsid = cpu_to_le32(ns->head->ns_id);
594 cmnd->dsm.nr = cpu_to_le32(segments - 1);
595 cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
597 req->special_vec.bv_page = virt_to_page(range);
598 req->special_vec.bv_offset = offset_in_page(range);
599 req->special_vec.bv_len = alloc_size;
600 req->rq_flags |= RQF_SPECIAL_PAYLOAD;
605 static inline blk_status_t nvme_setup_rw(struct nvme_ns *ns,
606 struct request *req, struct nvme_command *cmnd)
608 struct nvme_ctrl *ctrl = ns->ctrl;
612 if (req->cmd_flags & REQ_FUA)
613 control |= NVME_RW_FUA;
614 if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD))
615 control |= NVME_RW_LR;
617 if (req->cmd_flags & REQ_RAHEAD)
618 dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;
620 memset(cmnd, 0, sizeof(*cmnd));
621 cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read);
622 cmnd->rw.nsid = cpu_to_le32(ns->head->ns_id);
623 cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
624 cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
626 if (req_op(req) == REQ_OP_WRITE && ctrl->nr_streams)
627 nvme_assign_write_stream(ctrl, req, &control, &dsmgmt);
631 * If formated with metadata, the block layer always provides a
632 * metadata buffer if CONFIG_BLK_DEV_INTEGRITY is enabled. Else
633 * we enable the PRACT bit for protection information or set the
634 * namespace capacity to zero to prevent any I/O.
636 if (!blk_integrity_rq(req)) {
637 if (WARN_ON_ONCE(!nvme_ns_has_pi(ns)))
638 return BLK_STS_NOTSUPP;
639 control |= NVME_RW_PRINFO_PRACT;
640 } else if (req_op(req) == REQ_OP_WRITE) {
641 t10_pi_prepare(req, ns->pi_type);
644 switch (ns->pi_type) {
645 case NVME_NS_DPS_PI_TYPE3:
646 control |= NVME_RW_PRINFO_PRCHK_GUARD;
648 case NVME_NS_DPS_PI_TYPE1:
649 case NVME_NS_DPS_PI_TYPE2:
650 control |= NVME_RW_PRINFO_PRCHK_GUARD |
651 NVME_RW_PRINFO_PRCHK_REF;
652 cmnd->rw.reftag = cpu_to_le32(t10_pi_ref_tag(req));
657 cmnd->rw.control = cpu_to_le16(control);
658 cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
662 void nvme_cleanup_cmd(struct request *req)
664 if (blk_integrity_rq(req) && req_op(req) == REQ_OP_READ &&
665 nvme_req(req)->status == 0) {
666 struct nvme_ns *ns = req->rq_disk->private_data;
668 t10_pi_complete(req, ns->pi_type,
669 blk_rq_bytes(req) >> ns->lba_shift);
671 if (req->rq_flags & RQF_SPECIAL_PAYLOAD) {
672 struct nvme_ns *ns = req->rq_disk->private_data;
673 struct page *page = req->special_vec.bv_page;
675 if (page == ns->ctrl->discard_page)
676 clear_bit_unlock(0, &ns->ctrl->discard_page_busy);
678 kfree(page_address(page) + req->special_vec.bv_offset);
681 EXPORT_SYMBOL_GPL(nvme_cleanup_cmd);
683 blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
684 struct nvme_command *cmd)
686 blk_status_t ret = BLK_STS_OK;
688 nvme_clear_nvme_request(req);
690 switch (req_op(req)) {
693 memcpy(cmd, nvme_req(req)->cmd, sizeof(*cmd));
696 nvme_setup_flush(ns, cmd);
698 case REQ_OP_WRITE_ZEROES:
699 /* currently only aliased to deallocate for a few ctrls: */
701 ret = nvme_setup_discard(ns, req, cmd);
705 ret = nvme_setup_rw(ns, req, cmd);
709 return BLK_STS_IOERR;
712 cmd->common.command_id = req->tag;
713 trace_nvme_setup_cmd(req, cmd);
716 EXPORT_SYMBOL_GPL(nvme_setup_cmd);
719 * Returns 0 on success. If the result is negative, it's a Linux error code;
720 * if the result is positive, it's an NVM Express status code
722 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
723 union nvme_result *result, void *buffer, unsigned bufflen,
724 unsigned timeout, int qid, int at_head,
725 blk_mq_req_flags_t flags)
730 req = nvme_alloc_request(q, cmd, flags, qid);
734 req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
736 if (buffer && bufflen) {
737 ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL);
742 blk_execute_rq(req->q, NULL, req, at_head);
744 *result = nvme_req(req)->result;
745 if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
748 ret = nvme_req(req)->status;
750 blk_mq_free_request(req);
753 EXPORT_SYMBOL_GPL(__nvme_submit_sync_cmd);
755 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
756 void *buffer, unsigned bufflen)
758 return __nvme_submit_sync_cmd(q, cmd, NULL, buffer, bufflen, 0,
761 EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd);
763 static void *nvme_add_user_metadata(struct bio *bio, void __user *ubuf,
764 unsigned len, u32 seed, bool write)
766 struct bio_integrity_payload *bip;
770 buf = kmalloc(len, GFP_KERNEL);
775 if (write && copy_from_user(buf, ubuf, len))
778 bip = bio_integrity_alloc(bio, GFP_KERNEL, 1);
784 bip->bip_iter.bi_size = len;
785 bip->bip_iter.bi_sector = seed;
786 ret = bio_integrity_add_page(bio, virt_to_page(buf), len,
787 offset_in_page(buf));
797 static int nvme_submit_user_cmd(struct request_queue *q,
798 struct nvme_command *cmd, void __user *ubuffer,
799 unsigned bufflen, void __user *meta_buffer, unsigned meta_len,
800 u32 meta_seed, u32 *result, unsigned timeout)
802 bool write = nvme_is_write(cmd);
803 struct nvme_ns *ns = q->queuedata;
804 struct gendisk *disk = ns ? ns->disk : NULL;
806 struct bio *bio = NULL;
810 req = nvme_alloc_request(q, cmd, 0, NVME_QID_ANY);
814 req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
815 nvme_req(req)->flags |= NVME_REQ_USERCMD;
817 if (ubuffer && bufflen) {
818 ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
824 if (disk && meta_buffer && meta_len) {
825 meta = nvme_add_user_metadata(bio, meta_buffer, meta_len,
831 req->cmd_flags |= REQ_INTEGRITY;
835 blk_execute_rq(req->q, disk, req, 0);
836 if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
839 ret = nvme_req(req)->status;
841 *result = le32_to_cpu(nvme_req(req)->result.u32);
842 if (meta && !ret && !write) {
843 if (copy_to_user(meta_buffer, meta, meta_len))
849 blk_rq_unmap_user(bio);
851 blk_mq_free_request(req);
855 static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status)
857 struct nvme_ctrl *ctrl = rq->end_io_data;
859 bool startka = false;
861 blk_mq_free_request(rq);
864 dev_err(ctrl->device,
865 "failed nvme_keep_alive_end_io error=%d\n",
870 spin_lock_irqsave(&ctrl->lock, flags);
871 if (ctrl->state == NVME_CTRL_LIVE ||
872 ctrl->state == NVME_CTRL_CONNECTING)
874 spin_unlock_irqrestore(&ctrl->lock, flags);
876 schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
879 static int nvme_keep_alive(struct nvme_ctrl *ctrl)
883 rq = nvme_alloc_request(ctrl->admin_q, &ctrl->ka_cmd, BLK_MQ_REQ_RESERVED,
888 rq->timeout = ctrl->kato * HZ;
889 rq->end_io_data = ctrl;
891 blk_execute_rq_nowait(rq->q, NULL, rq, 0, nvme_keep_alive_end_io);
896 static void nvme_keep_alive_work(struct work_struct *work)
898 struct nvme_ctrl *ctrl = container_of(to_delayed_work(work),
899 struct nvme_ctrl, ka_work);
901 if (nvme_keep_alive(ctrl)) {
902 /* allocation failure, reset the controller */
903 dev_err(ctrl->device, "keep-alive failed\n");
904 nvme_reset_ctrl(ctrl);
909 static void nvme_start_keep_alive(struct nvme_ctrl *ctrl)
911 if (unlikely(ctrl->kato == 0))
914 schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
917 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl)
919 if (unlikely(ctrl->kato == 0))
922 cancel_delayed_work_sync(&ctrl->ka_work);
924 EXPORT_SYMBOL_GPL(nvme_stop_keep_alive);
927 * In NVMe 1.0 the CNS field was just a binary controller or namespace
928 * flag, thus sending any new CNS opcodes has a big chance of not working.
929 * Qemu unfortunately had that bug after reporting a 1.1 version compliance
930 * (but not for any later version).
932 static bool nvme_ctrl_limited_cns(struct nvme_ctrl *ctrl)
934 if (ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)
935 return ctrl->vs < NVME_VS(1, 2, 0);
936 return ctrl->vs < NVME_VS(1, 1, 0);
939 static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
941 struct nvme_command c = { };
944 /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
945 c.identify.opcode = nvme_admin_identify;
946 c.identify.cns = NVME_ID_CNS_CTRL;
948 *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL);
952 error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
953 sizeof(struct nvme_id_ctrl));
959 static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
960 struct nvme_ns_ids *ids)
962 struct nvme_command c = { };
968 c.identify.opcode = nvme_admin_identify;
969 c.identify.nsid = cpu_to_le32(nsid);
970 c.identify.cns = NVME_ID_CNS_NS_DESC_LIST;
972 data = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL);
976 status = nvme_submit_sync_cmd(ctrl->admin_q, &c, data,
977 NVME_IDENTIFY_DATA_SIZE);
981 for (pos = 0; pos < NVME_IDENTIFY_DATA_SIZE; pos += len) {
982 struct nvme_ns_id_desc *cur = data + pos;
988 case NVME_NIDT_EUI64:
989 if (cur->nidl != NVME_NIDT_EUI64_LEN) {
990 dev_warn(ctrl->device,
991 "ctrl returned bogus length: %d for NVME_NIDT_EUI64\n",
995 len = NVME_NIDT_EUI64_LEN;
996 memcpy(ids->eui64, data + pos + sizeof(*cur), len);
998 case NVME_NIDT_NGUID:
999 if (cur->nidl != NVME_NIDT_NGUID_LEN) {
1000 dev_warn(ctrl->device,
1001 "ctrl returned bogus length: %d for NVME_NIDT_NGUID\n",
1005 len = NVME_NIDT_NGUID_LEN;
1006 memcpy(ids->nguid, data + pos + sizeof(*cur), len);
1008 case NVME_NIDT_UUID:
1009 if (cur->nidl != NVME_NIDT_UUID_LEN) {
1010 dev_warn(ctrl->device,
1011 "ctrl returned bogus length: %d for NVME_NIDT_UUID\n",
1015 len = NVME_NIDT_UUID_LEN;
1016 uuid_copy(&ids->uuid, data + pos + sizeof(*cur));
1019 /* Skip unnkown types */
1024 len += sizeof(*cur);
1031 static int nvme_identify_ns_list(struct nvme_ctrl *dev, unsigned nsid, __le32 *ns_list)
1033 struct nvme_command c = { };
1035 c.identify.opcode = nvme_admin_identify;
1036 c.identify.cns = NVME_ID_CNS_NS_ACTIVE_LIST;
1037 c.identify.nsid = cpu_to_le32(nsid);
1038 return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list,
1039 NVME_IDENTIFY_DATA_SIZE);
1042 static struct nvme_id_ns *nvme_identify_ns(struct nvme_ctrl *ctrl,
1045 struct nvme_id_ns *id;
1046 struct nvme_command c = { };
1049 /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
1050 c.identify.opcode = nvme_admin_identify;
1051 c.identify.nsid = cpu_to_le32(nsid);
1052 c.identify.cns = NVME_ID_CNS_NS;
1054 id = kmalloc(sizeof(*id), GFP_KERNEL);
1058 error = nvme_submit_sync_cmd(ctrl->admin_q, &c, id, sizeof(*id));
1060 dev_warn(ctrl->device, "Identify namespace failed\n");
1068 static int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
1069 void *buffer, size_t buflen, u32 *result)
1071 union nvme_result res = { 0 };
1072 struct nvme_command c;
1075 memset(&c, 0, sizeof(c));
1076 c.features.opcode = nvme_admin_set_features;
1077 c.features.fid = cpu_to_le32(fid);
1078 c.features.dword11 = cpu_to_le32(dword11);
1080 ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &res,
1081 buffer, buflen, 0, NVME_QID_ANY, 0, 0);
1082 if (ret >= 0 && result)
1083 *result = le32_to_cpu(res.u32);
1087 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count)
1089 u32 q_count = (*count - 1) | ((*count - 1) << 16);
1091 int status, nr_io_queues;
1093 status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, NULL, 0,
1099 * Degraded controllers might return an error when setting the queue
1100 * count. We still want to be able to bring them online and offer
1101 * access to the admin queue, as that might be only way to fix them up.
1104 dev_err(ctrl->device, "Could not set queue count (%d)\n", status);
1107 nr_io_queues = min(result & 0xffff, result >> 16) + 1;
1108 *count = min(*count, nr_io_queues);
1113 EXPORT_SYMBOL_GPL(nvme_set_queue_count);
1115 #define NVME_AEN_SUPPORTED \
1116 (NVME_AEN_CFG_NS_ATTR | NVME_AEN_CFG_FW_ACT | NVME_AEN_CFG_ANA_CHANGE)
1118 static void nvme_enable_aen(struct nvme_ctrl *ctrl)
1120 u32 result, supported_aens = ctrl->oaes & NVME_AEN_SUPPORTED;
1123 if (!supported_aens)
1126 status = nvme_set_features(ctrl, NVME_FEAT_ASYNC_EVENT, supported_aens,
1129 dev_warn(ctrl->device, "Failed to configure AEN (cfg %x)\n",
1133 static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
1135 struct nvme_user_io io;
1136 struct nvme_command c;
1137 unsigned length, meta_len;
1138 void __user *metadata;
1140 if (copy_from_user(&io, uio, sizeof(io)))
1145 switch (io.opcode) {
1146 case nvme_cmd_write:
1148 case nvme_cmd_compare:
1154 length = (io.nblocks + 1) << ns->lba_shift;
1155 meta_len = (io.nblocks + 1) * ns->ms;
1156 metadata = (void __user *)(uintptr_t)io.metadata;
1161 } else if (meta_len) {
1162 if ((io.metadata & 3) || !io.metadata)
1166 memset(&c, 0, sizeof(c));
1167 c.rw.opcode = io.opcode;
1168 c.rw.flags = io.flags;
1169 c.rw.nsid = cpu_to_le32(ns->head->ns_id);
1170 c.rw.slba = cpu_to_le64(io.slba);
1171 c.rw.length = cpu_to_le16(io.nblocks);
1172 c.rw.control = cpu_to_le16(io.control);
1173 c.rw.dsmgmt = cpu_to_le32(io.dsmgmt);
1174 c.rw.reftag = cpu_to_le32(io.reftag);
1175 c.rw.apptag = cpu_to_le16(io.apptag);
1176 c.rw.appmask = cpu_to_le16(io.appmask);
1178 return nvme_submit_user_cmd(ns->queue, &c,
1179 (void __user *)(uintptr_t)io.addr, length,
1180 metadata, meta_len, io.slba, NULL, 0);
1183 static u32 nvme_known_admin_effects(u8 opcode)
1186 case nvme_admin_format_nvm:
1187 return NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC |
1188 NVME_CMD_EFFECTS_CSE_MASK;
1189 case nvme_admin_sanitize_nvm:
1190 return NVME_CMD_EFFECTS_CSE_MASK;
1197 static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
1204 effects = le32_to_cpu(ctrl->effects->iocs[opcode]);
1205 if (effects & ~NVME_CMD_EFFECTS_CSUPP)
1206 dev_warn(ctrl->device,
1207 "IO command:%02x has unhandled effects:%08x\n",
1213 effects = le32_to_cpu(ctrl->effects->acs[opcode]);
1215 effects = nvme_known_admin_effects(opcode);
1218 * For simplicity, IO to all namespaces is quiesced even if the command
1219 * effects say only one namespace is affected.
1221 if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) {
1222 mutex_lock(&ctrl->scan_lock);
1223 mutex_lock(&ctrl->subsys->lock);
1224 nvme_mpath_start_freeze(ctrl->subsys);
1225 nvme_mpath_wait_freeze(ctrl->subsys);
1226 nvme_start_freeze(ctrl);
1227 nvme_wait_freeze(ctrl);
1232 static void nvme_update_formats(struct nvme_ctrl *ctrl)
1236 down_read(&ctrl->namespaces_rwsem);
1237 list_for_each_entry(ns, &ctrl->namespaces, list)
1238 if (ns->disk && nvme_revalidate_disk(ns->disk))
1239 nvme_set_queue_dying(ns);
1240 up_read(&ctrl->namespaces_rwsem);
1242 nvme_remove_invalid_namespaces(ctrl, NVME_NSID_ALL);
1245 static void nvme_passthru_end(struct nvme_ctrl *ctrl, u32 effects)
1248 * Revalidate LBA changes prior to unfreezing. This is necessary to
1249 * prevent memory corruption if a logical block size was changed by
1252 if (effects & NVME_CMD_EFFECTS_LBCC)
1253 nvme_update_formats(ctrl);
1254 if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) {
1255 nvme_unfreeze(ctrl);
1256 nvme_mpath_unfreeze(ctrl->subsys);
1257 mutex_unlock(&ctrl->subsys->lock);
1258 mutex_unlock(&ctrl->scan_lock);
1260 if (effects & NVME_CMD_EFFECTS_CCC)
1261 nvme_init_identify(ctrl);
1262 if (effects & (NVME_CMD_EFFECTS_NIC | NVME_CMD_EFFECTS_NCC))
1263 nvme_queue_scan(ctrl);
1266 static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
1267 struct nvme_passthru_cmd __user *ucmd)
1269 struct nvme_passthru_cmd cmd;
1270 struct nvme_command c;
1271 unsigned timeout = 0;
1275 if (!capable(CAP_SYS_ADMIN))
1277 if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
1282 memset(&c, 0, sizeof(c));
1283 c.common.opcode = cmd.opcode;
1284 c.common.flags = cmd.flags;
1285 c.common.nsid = cpu_to_le32(cmd.nsid);
1286 c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
1287 c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
1288 c.common.cdw10[0] = cpu_to_le32(cmd.cdw10);
1289 c.common.cdw10[1] = cpu_to_le32(cmd.cdw11);
1290 c.common.cdw10[2] = cpu_to_le32(cmd.cdw12);
1291 c.common.cdw10[3] = cpu_to_le32(cmd.cdw13);
1292 c.common.cdw10[4] = cpu_to_le32(cmd.cdw14);
1293 c.common.cdw10[5] = cpu_to_le32(cmd.cdw15);
1296 timeout = msecs_to_jiffies(cmd.timeout_ms);
1298 effects = nvme_passthru_start(ctrl, ns, cmd.opcode);
1299 status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
1300 (void __user *)(uintptr_t)cmd.addr, cmd.data_len,
1301 (void __user *)(uintptr_t)cmd.metadata, cmd.metadata_len,
1302 0, &cmd.result, timeout);
1303 nvme_passthru_end(ctrl, effects);
1306 if (put_user(cmd.result, &ucmd->result))
1314 * Issue ioctl requests on the first available path. Note that unlike normal
1315 * block layer requests we will not retry failed request on another controller.
1317 static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk,
1318 struct nvme_ns_head **head, int *srcu_idx)
1320 #ifdef CONFIG_NVME_MULTIPATH
1321 if (disk->fops == &nvme_ns_head_ops) {
1324 *head = disk->private_data;
1325 *srcu_idx = srcu_read_lock(&(*head)->srcu);
1326 ns = nvme_find_path(*head);
1328 srcu_read_unlock(&(*head)->srcu, *srcu_idx);
1334 return disk->private_data;
1337 static void nvme_put_ns_from_disk(struct nvme_ns_head *head, int idx)
1340 srcu_read_unlock(&head->srcu, idx);
1343 static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
1344 unsigned int cmd, unsigned long arg)
1346 struct nvme_ns_head *head = NULL;
1347 void __user *argp = (void __user *)arg;
1351 ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx);
1353 return -EWOULDBLOCK;
1356 * Handle ioctls that apply to the controller instead of the namespace
1357 * seperately and drop the ns SRCU reference early. This avoids a
1358 * deadlock when deleting namespaces using the passthrough interface.
1360 if (cmd == NVME_IOCTL_ADMIN_CMD || is_sed_ioctl(cmd)) {
1361 struct nvme_ctrl *ctrl = ns->ctrl;
1363 nvme_get_ctrl(ns->ctrl);
1364 nvme_put_ns_from_disk(head, srcu_idx);
1366 if (cmd == NVME_IOCTL_ADMIN_CMD)
1367 ret = nvme_user_cmd(ctrl, NULL, argp);
1369 ret = sed_ioctl(ctrl->opal_dev, cmd, argp);
1371 nvme_put_ctrl(ctrl);
1377 force_successful_syscall_return();
1378 ret = ns->head->ns_id;
1380 case NVME_IOCTL_IO_CMD:
1381 ret = nvme_user_cmd(ns->ctrl, ns, argp);
1383 case NVME_IOCTL_SUBMIT_IO:
1384 ret = nvme_submit_io(ns, argp);
1388 ret = nvme_nvm_ioctl(ns, cmd, arg);
1393 nvme_put_ns_from_disk(head, srcu_idx);
1397 static int nvme_open(struct block_device *bdev, fmode_t mode)
1399 struct nvme_ns *ns = bdev->bd_disk->private_data;
1401 #ifdef CONFIG_NVME_MULTIPATH
1402 /* should never be called due to GENHD_FL_HIDDEN */
1403 if (WARN_ON_ONCE(ns->head->disk))
1406 if (!kref_get_unless_zero(&ns->kref))
1408 if (!try_module_get(ns->ctrl->ops->module))
1419 static void nvme_release(struct gendisk *disk, fmode_t mode)
1421 struct nvme_ns *ns = disk->private_data;
1423 module_put(ns->ctrl->ops->module);
1427 static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1429 /* some standard values */
1430 geo->heads = 1 << 6;
1431 geo->sectors = 1 << 5;
1432 geo->cylinders = get_capacity(bdev->bd_disk) >> 11;
1436 #ifdef CONFIG_BLK_DEV_INTEGRITY
1437 static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type)
1439 struct blk_integrity integrity;
1441 memset(&integrity, 0, sizeof(integrity));
1443 case NVME_NS_DPS_PI_TYPE3:
1444 integrity.profile = &t10_pi_type3_crc;
1445 integrity.tag_size = sizeof(u16) + sizeof(u32);
1446 integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
1448 case NVME_NS_DPS_PI_TYPE1:
1449 case NVME_NS_DPS_PI_TYPE2:
1450 integrity.profile = &t10_pi_type1_crc;
1451 integrity.tag_size = sizeof(u16);
1452 integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
1455 integrity.profile = NULL;
1458 integrity.tuple_size = ms;
1459 blk_integrity_register(disk, &integrity);
1460 blk_queue_max_integrity_segments(disk->queue, 1);
1463 static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type)
1466 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1468 static void nvme_set_chunk_size(struct nvme_ns *ns)
1470 u32 chunk_size = (((u32)ns->noiob) << (ns->lba_shift - 9));
1471 blk_queue_chunk_sectors(ns->queue, rounddown_pow_of_two(chunk_size));
1474 static void nvme_config_discard(struct nvme_ns *ns)
1476 struct nvme_ctrl *ctrl = ns->ctrl;
1477 struct request_queue *queue = ns->queue;
1478 u32 size = queue_logical_block_size(queue);
1480 if (!(ctrl->oncs & NVME_CTRL_ONCS_DSM)) {
1481 blk_queue_flag_clear(QUEUE_FLAG_DISCARD, queue);
1485 if (ctrl->nr_streams && ns->sws && ns->sgs)
1486 size *= ns->sws * ns->sgs;
1488 BUILD_BUG_ON(PAGE_SIZE / sizeof(struct nvme_dsm_range) <
1489 NVME_DSM_MAX_RANGES);
1491 queue->limits.discard_alignment = 0;
1492 queue->limits.discard_granularity = size;
1494 /* If discard is already enabled, don't reset queue limits */
1495 if (blk_queue_flag_test_and_set(QUEUE_FLAG_DISCARD, queue))
1498 blk_queue_max_discard_sectors(queue, UINT_MAX);
1499 blk_queue_max_discard_segments(queue, NVME_DSM_MAX_RANGES);
1501 if (ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
1502 blk_queue_max_write_zeroes_sectors(queue, UINT_MAX);
1505 static void nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid,
1506 struct nvme_id_ns *id, struct nvme_ns_ids *ids)
1508 memset(ids, 0, sizeof(*ids));
1510 if (ctrl->vs >= NVME_VS(1, 1, 0))
1511 memcpy(ids->eui64, id->eui64, sizeof(id->eui64));
1512 if (ctrl->vs >= NVME_VS(1, 2, 0))
1513 memcpy(ids->nguid, id->nguid, sizeof(id->nguid));
1514 if (ctrl->vs >= NVME_VS(1, 3, 0)) {
1515 /* Don't treat error as fatal we potentially
1516 * already have a NGUID or EUI-64
1518 if (nvme_identify_ns_descs(ctrl, nsid, ids))
1519 dev_warn(ctrl->device,
1520 "%s: Identify Descriptors failed\n", __func__);
1524 static bool nvme_ns_ids_valid(struct nvme_ns_ids *ids)
1526 return !uuid_is_null(&ids->uuid) ||
1527 memchr_inv(ids->nguid, 0, sizeof(ids->nguid)) ||
1528 memchr_inv(ids->eui64, 0, sizeof(ids->eui64));
1531 static bool nvme_ns_ids_equal(struct nvme_ns_ids *a, struct nvme_ns_ids *b)
1533 return uuid_equal(&a->uuid, &b->uuid) &&
1534 memcmp(&a->nguid, &b->nguid, sizeof(a->nguid)) == 0 &&
1535 memcmp(&a->eui64, &b->eui64, sizeof(a->eui64)) == 0;
1538 static void nvme_update_disk_info(struct gendisk *disk,
1539 struct nvme_ns *ns, struct nvme_id_ns *id)
1541 sector_t capacity = le64_to_cpup(&id->nsze) << (ns->lba_shift - 9);
1542 unsigned short bs = 1 << ns->lba_shift;
1544 if (ns->lba_shift > PAGE_SHIFT) {
1545 /* unsupported block size, set capacity to 0 later */
1548 blk_mq_freeze_queue(disk->queue);
1549 blk_integrity_unregister(disk);
1551 blk_queue_logical_block_size(disk->queue, bs);
1552 blk_queue_physical_block_size(disk->queue, bs);
1553 blk_queue_io_min(disk->queue, bs);
1555 if (ns->ms && !ns->ext &&
1556 (ns->ctrl->ops->flags & NVME_F_METADATA_SUPPORTED))
1557 nvme_init_integrity(disk, ns->ms, ns->pi_type);
1558 if ((ns->ms && !nvme_ns_has_pi(ns) && !blk_get_integrity(disk)) ||
1559 ns->lba_shift > PAGE_SHIFT)
1562 set_capacity(disk, capacity);
1563 nvme_config_discard(ns);
1565 if (id->nsattr & (1 << 0))
1566 set_disk_ro(disk, true);
1568 set_disk_ro(disk, false);
1570 blk_mq_unfreeze_queue(disk->queue);
1573 static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
1575 struct nvme_ns *ns = disk->private_data;
1578 * If identify namespace failed, use default 512 byte block size so
1579 * block layer can use before failing read/write for 0 capacity.
1581 ns->lba_shift = id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ds;
1582 if (ns->lba_shift == 0)
1584 ns->noiob = le16_to_cpu(id->noiob);
1585 ns->ms = le16_to_cpu(id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ms);
1586 ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT);
1587 /* the PI implementation requires metadata equal t10 pi tuple size */
1588 if (ns->ms == sizeof(struct t10_pi_tuple))
1589 ns->pi_type = id->dps & NVME_NS_DPS_PI_MASK;
1594 nvme_set_chunk_size(ns);
1595 nvme_update_disk_info(disk, ns, id);
1597 nvme_nvm_update_nvm_info(ns);
1598 #ifdef CONFIG_NVME_MULTIPATH
1599 if (ns->head->disk) {
1600 nvme_update_disk_info(ns->head->disk, ns, id);
1601 blk_queue_stack_limits(ns->head->disk->queue, ns->queue);
1602 nvme_mpath_update_disk_size(ns->head->disk);
1607 static int nvme_revalidate_disk(struct gendisk *disk)
1609 struct nvme_ns *ns = disk->private_data;
1610 struct nvme_ctrl *ctrl = ns->ctrl;
1611 struct nvme_id_ns *id;
1612 struct nvme_ns_ids ids;
1615 if (test_bit(NVME_NS_DEAD, &ns->flags)) {
1616 set_capacity(disk, 0);
1620 id = nvme_identify_ns(ctrl, ns->head->ns_id);
1624 if (id->ncap == 0) {
1629 __nvme_revalidate_disk(disk, id);
1630 nvme_report_ns_ids(ctrl, ns->head->ns_id, id, &ids);
1631 if (!nvme_ns_ids_equal(&ns->head->ids, &ids)) {
1632 dev_err(ctrl->device,
1633 "identifiers changed for nsid %d\n", ns->head->ns_id);
1642 static char nvme_pr_type(enum pr_type type)
1645 case PR_WRITE_EXCLUSIVE:
1647 case PR_EXCLUSIVE_ACCESS:
1649 case PR_WRITE_EXCLUSIVE_REG_ONLY:
1651 case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1653 case PR_WRITE_EXCLUSIVE_ALL_REGS:
1655 case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1662 static int nvme_pr_command(struct block_device *bdev, u32 cdw10,
1663 u64 key, u64 sa_key, u8 op)
1665 struct nvme_ns_head *head = NULL;
1667 struct nvme_command c;
1669 u8 data[16] = { 0, };
1671 ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx);
1673 return -EWOULDBLOCK;
1675 put_unaligned_le64(key, &data[0]);
1676 put_unaligned_le64(sa_key, &data[8]);
1678 memset(&c, 0, sizeof(c));
1679 c.common.opcode = op;
1680 c.common.nsid = cpu_to_le32(ns->head->ns_id);
1681 c.common.cdw10[0] = cpu_to_le32(cdw10);
1683 ret = nvme_submit_sync_cmd(ns->queue, &c, data, 16);
1684 nvme_put_ns_from_disk(head, srcu_idx);
1688 static int nvme_pr_register(struct block_device *bdev, u64 old,
1689 u64 new, unsigned flags)
1693 if (flags & ~PR_FL_IGNORE_KEY)
1696 cdw10 = old ? 2 : 0;
1697 cdw10 |= (flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0;
1698 cdw10 |= (1 << 30) | (1 << 31); /* PTPL=1 */
1699 return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_register);
1702 static int nvme_pr_reserve(struct block_device *bdev, u64 key,
1703 enum pr_type type, unsigned flags)
1707 if (flags & ~PR_FL_IGNORE_KEY)
1710 cdw10 = nvme_pr_type(type) << 8;
1711 cdw10 |= ((flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0);
1712 return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_acquire);
1715 static int nvme_pr_preempt(struct block_device *bdev, u64 old, u64 new,
1716 enum pr_type type, bool abort)
1718 u32 cdw10 = nvme_pr_type(type) << 8 | (abort ? 2 : 1);
1719 return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_acquire);
1722 static int nvme_pr_clear(struct block_device *bdev, u64 key)
1724 u32 cdw10 = 1 | (key ? 1 << 3 : 0);
1725 return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_register);
1728 static int nvme_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1730 u32 cdw10 = nvme_pr_type(type) << 8 | (key ? 1 << 3 : 0);
1731 return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_release);
1734 static const struct pr_ops nvme_pr_ops = {
1735 .pr_register = nvme_pr_register,
1736 .pr_reserve = nvme_pr_reserve,
1737 .pr_release = nvme_pr_release,
1738 .pr_preempt = nvme_pr_preempt,
1739 .pr_clear = nvme_pr_clear,
1742 #ifdef CONFIG_BLK_SED_OPAL
1743 int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
1746 struct nvme_ctrl *ctrl = data;
1747 struct nvme_command cmd;
1749 memset(&cmd, 0, sizeof(cmd));
1751 cmd.common.opcode = nvme_admin_security_send;
1753 cmd.common.opcode = nvme_admin_security_recv;
1754 cmd.common.nsid = 0;
1755 cmd.common.cdw10[0] = cpu_to_le32(((u32)secp) << 24 | ((u32)spsp) << 8);
1756 cmd.common.cdw10[1] = cpu_to_le32(len);
1758 return __nvme_submit_sync_cmd(ctrl->admin_q, &cmd, NULL, buffer, len,
1759 ADMIN_TIMEOUT, NVME_QID_ANY, 1, 0);
1761 EXPORT_SYMBOL_GPL(nvme_sec_submit);
1762 #endif /* CONFIG_BLK_SED_OPAL */
1764 static const struct block_device_operations nvme_fops = {
1765 .owner = THIS_MODULE,
1766 .ioctl = nvme_ioctl,
1767 .compat_ioctl = nvme_ioctl,
1769 .release = nvme_release,
1770 .getgeo = nvme_getgeo,
1771 .revalidate_disk= nvme_revalidate_disk,
1772 .pr_ops = &nvme_pr_ops,
1775 #ifdef CONFIG_NVME_MULTIPATH
1776 static int nvme_ns_head_open(struct block_device *bdev, fmode_t mode)
1778 struct nvme_ns_head *head = bdev->bd_disk->private_data;
1780 if (!kref_get_unless_zero(&head->ref))
1785 static void nvme_ns_head_release(struct gendisk *disk, fmode_t mode)
1787 nvme_put_ns_head(disk->private_data);
1790 const struct block_device_operations nvme_ns_head_ops = {
1791 .owner = THIS_MODULE,
1792 .open = nvme_ns_head_open,
1793 .release = nvme_ns_head_release,
1794 .ioctl = nvme_ioctl,
1795 .compat_ioctl = nvme_ioctl,
1796 .getgeo = nvme_getgeo,
1797 .pr_ops = &nvme_pr_ops,
1799 #endif /* CONFIG_NVME_MULTIPATH */
1801 static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled)
1803 unsigned long timeout =
1804 ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
1805 u32 csts, bit = enabled ? NVME_CSTS_RDY : 0;
1808 while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
1811 if ((csts & NVME_CSTS_RDY) == bit)
1815 if (fatal_signal_pending(current))
1817 if (time_after(jiffies, timeout)) {
1818 dev_err(ctrl->device,
1819 "Device not ready; aborting %s\n", enabled ?
1820 "initialisation" : "reset");
1829 * If the device has been passed off to us in an enabled state, just clear
1830 * the enabled bit. The spec says we should set the 'shutdown notification
1831 * bits', but doing so may cause the device to complete commands to the
1832 * admin queue ... and we don't know what memory that might be pointing at!
1834 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
1838 ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
1839 ctrl->ctrl_config &= ~NVME_CC_ENABLE;
1841 ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
1845 if (ctrl->quirks & NVME_QUIRK_DELAY_BEFORE_CHK_RDY)
1846 msleep(NVME_QUIRK_DELAY_AMOUNT);
1848 return nvme_wait_ready(ctrl, cap, false);
1850 EXPORT_SYMBOL_GPL(nvme_disable_ctrl);
1852 int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
1855 * Default to a 4K page size, with the intention to update this
1856 * path in the future to accomodate architectures with differing
1857 * kernel and IO page sizes.
1859 unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12, page_shift = 12;
1862 if (page_shift < dev_page_min) {
1863 dev_err(ctrl->device,
1864 "Minimum device page size %u too large for host (%u)\n",
1865 1 << dev_page_min, 1 << page_shift);
1869 ctrl->page_size = 1 << page_shift;
1871 ctrl->ctrl_config = NVME_CC_CSS_NVM;
1872 ctrl->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT;
1873 ctrl->ctrl_config |= NVME_CC_AMS_RR | NVME_CC_SHN_NONE;
1874 ctrl->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;
1875 ctrl->ctrl_config |= NVME_CC_ENABLE;
1877 ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
1880 return nvme_wait_ready(ctrl, cap, true);
1882 EXPORT_SYMBOL_GPL(nvme_enable_ctrl);
1884 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
1886 unsigned long timeout = jiffies + (ctrl->shutdown_timeout * HZ);
1890 ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
1891 ctrl->ctrl_config |= NVME_CC_SHN_NORMAL;
1893 ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
1897 while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
1898 if ((csts & NVME_CSTS_SHST_MASK) == NVME_CSTS_SHST_CMPLT)
1902 if (fatal_signal_pending(current))
1904 if (time_after(jiffies, timeout)) {
1905 dev_err(ctrl->device,
1906 "Device shutdown incomplete; abort shutdown\n");
1913 EXPORT_SYMBOL_GPL(nvme_shutdown_ctrl);
1915 static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
1916 struct request_queue *q)
1920 if (ctrl->max_hw_sectors) {
1922 (ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1;
1924 max_segments = min_not_zero(max_segments, ctrl->max_segments);
1925 blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
1926 blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
1928 if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) &&
1929 is_power_of_2(ctrl->max_hw_sectors))
1930 blk_queue_chunk_sectors(q, ctrl->max_hw_sectors);
1931 blk_queue_virt_boundary(q, ctrl->page_size - 1);
1932 if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
1934 blk_queue_write_cache(q, vwc, vwc);
1937 static int nvme_configure_timestamp(struct nvme_ctrl *ctrl)
1942 if (!(ctrl->oncs & NVME_CTRL_ONCS_TIMESTAMP))
1945 ts = cpu_to_le64(ktime_to_ms(ktime_get_real()));
1946 ret = nvme_set_features(ctrl, NVME_FEAT_TIMESTAMP, 0, &ts, sizeof(ts),
1949 dev_warn_once(ctrl->device,
1950 "could not set timestamp (%d)\n", ret);
1954 static int nvme_configure_apst(struct nvme_ctrl *ctrl)
1957 * APST (Autonomous Power State Transition) lets us program a
1958 * table of power state transitions that the controller will
1959 * perform automatically. We configure it with a simple
1960 * heuristic: we are willing to spend at most 2% of the time
1961 * transitioning between power states. Therefore, when running
1962 * in any given state, we will enter the next lower-power
1963 * non-operational state after waiting 50 * (enlat + exlat)
1964 * microseconds, as long as that state's exit latency is under
1965 * the requested maximum latency.
1967 * We will not autonomously enter any non-operational state for
1968 * which the total latency exceeds ps_max_latency_us. Users
1969 * can set ps_max_latency_us to zero to turn off APST.
1973 struct nvme_feat_auto_pst *table;
1979 * If APST isn't supported or if we haven't been initialized yet,
1980 * then don't do anything.
1985 if (ctrl->npss > 31) {
1986 dev_warn(ctrl->device, "NPSS is invalid; not using APST\n");
1990 table = kzalloc(sizeof(*table), GFP_KERNEL);
1994 if (!ctrl->apst_enabled || ctrl->ps_max_latency_us == 0) {
1995 /* Turn off APST. */
1997 dev_dbg(ctrl->device, "APST disabled\n");
1999 __le64 target = cpu_to_le64(0);
2003 * Walk through all states from lowest- to highest-power.
2004 * According to the spec, lower-numbered states use more
2005 * power. NPSS, despite the name, is the index of the
2006 * lowest-power state, not the number of states.
2008 for (state = (int)ctrl->npss; state >= 0; state--) {
2009 u64 total_latency_us, exit_latency_us, transition_ms;
2012 table->entries[state] = target;
2015 * Don't allow transitions to the deepest state
2016 * if it's quirked off.
2018 if (state == ctrl->npss &&
2019 (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS))
2023 * Is this state a useful non-operational state for
2024 * higher-power states to autonomously transition to?
2026 if (!(ctrl->psd[state].flags &
2027 NVME_PS_FLAGS_NON_OP_STATE))
2031 (u64)le32_to_cpu(ctrl->psd[state].exit_lat);
2032 if (exit_latency_us > ctrl->ps_max_latency_us)
2037 le32_to_cpu(ctrl->psd[state].entry_lat);
2040 * This state is good. Use it as the APST idle
2041 * target for higher power states.
2043 transition_ms = total_latency_us + 19;
2044 do_div(transition_ms, 20);
2045 if (transition_ms > (1 << 24) - 1)
2046 transition_ms = (1 << 24) - 1;
2048 target = cpu_to_le64((state << 3) |
2049 (transition_ms << 8));
2054 if (total_latency_us > max_lat_us)
2055 max_lat_us = total_latency_us;
2061 dev_dbg(ctrl->device, "APST enabled but no non-operational states are available\n");
2063 dev_dbg(ctrl->device, "APST enabled: max PS = %d, max round-trip latency = %lluus, table = %*phN\n",
2064 max_ps, max_lat_us, (int)sizeof(*table), table);
2068 ret = nvme_set_features(ctrl, NVME_FEAT_AUTO_PST, apste,
2069 table, sizeof(*table), NULL);
2071 dev_err(ctrl->device, "failed to set APST feature (%d)\n", ret);
2077 static void nvme_set_latency_tolerance(struct device *dev, s32 val)
2079 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
2083 case PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT:
2084 case PM_QOS_LATENCY_ANY:
2092 if (ctrl->ps_max_latency_us != latency) {
2093 ctrl->ps_max_latency_us = latency;
2094 if (ctrl->state == NVME_CTRL_LIVE)
2095 nvme_configure_apst(ctrl);
2099 struct nvme_core_quirk_entry {
2101 * NVMe model and firmware strings are padded with spaces. For
2102 * simplicity, strings in the quirk table are padded with NULLs
2108 unsigned long quirks;
2111 static const struct nvme_core_quirk_entry core_quirks[] = {
2114 * This Toshiba device seems to die using any APST states. See:
2115 * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1678184/comments/11
2118 .mn = "THNSF5256GPUK TOSHIBA",
2119 .quirks = NVME_QUIRK_NO_APST,
2123 /* match is null-terminated but idstr is space-padded. */
2124 static bool string_matches(const char *idstr, const char *match, size_t len)
2131 matchlen = strlen(match);
2132 WARN_ON_ONCE(matchlen > len);
2134 if (memcmp(idstr, match, matchlen))
2137 for (; matchlen < len; matchlen++)
2138 if (idstr[matchlen] != ' ')
2144 static bool quirk_matches(const struct nvme_id_ctrl *id,
2145 const struct nvme_core_quirk_entry *q)
2147 return q->vid == le16_to_cpu(id->vid) &&
2148 string_matches(id->mn, q->mn, sizeof(id->mn)) &&
2149 string_matches(id->fr, q->fr, sizeof(id->fr));
2152 static void nvme_init_subnqn(struct nvme_subsystem *subsys, struct nvme_ctrl *ctrl,
2153 struct nvme_id_ctrl *id)
2158 nqnlen = strnlen(id->subnqn, NVMF_NQN_SIZE);
2159 if (nqnlen > 0 && nqnlen < NVMF_NQN_SIZE) {
2160 strncpy(subsys->subnqn, id->subnqn, NVMF_NQN_SIZE);
2164 if (ctrl->vs >= NVME_VS(1, 2, 1))
2165 dev_warn(ctrl->device, "missing or invalid SUBNQN field.\n");
2167 /* Generate a "fake" NQN per Figure 254 in NVMe 1.3 + ECN 001 */
2168 off = snprintf(subsys->subnqn, NVMF_NQN_SIZE,
2169 "nqn.2014.08.org.nvmexpress:%04x%04x",
2170 le16_to_cpu(id->vid), le16_to_cpu(id->ssvid));
2171 memcpy(subsys->subnqn + off, id->sn, sizeof(id->sn));
2172 off += sizeof(id->sn);
2173 memcpy(subsys->subnqn + off, id->mn, sizeof(id->mn));
2174 off += sizeof(id->mn);
2175 memset(subsys->subnqn + off, 0, sizeof(subsys->subnqn) - off);
2178 static void __nvme_release_subsystem(struct nvme_subsystem *subsys)
2180 ida_simple_remove(&nvme_subsystems_ida, subsys->instance);
2184 static void nvme_release_subsystem(struct device *dev)
2186 __nvme_release_subsystem(container_of(dev, struct nvme_subsystem, dev));
2189 static void nvme_destroy_subsystem(struct kref *ref)
2191 struct nvme_subsystem *subsys =
2192 container_of(ref, struct nvme_subsystem, ref);
2194 mutex_lock(&nvme_subsystems_lock);
2195 list_del(&subsys->entry);
2196 mutex_unlock(&nvme_subsystems_lock);
2198 ida_destroy(&subsys->ns_ida);
2199 device_del(&subsys->dev);
2200 put_device(&subsys->dev);
2203 static void nvme_put_subsystem(struct nvme_subsystem *subsys)
2205 kref_put(&subsys->ref, nvme_destroy_subsystem);
2208 static struct nvme_subsystem *__nvme_find_get_subsystem(const char *subsysnqn)
2210 struct nvme_subsystem *subsys;
2212 lockdep_assert_held(&nvme_subsystems_lock);
2215 * Fail matches for discovery subsystems. This results
2216 * in each discovery controller bound to a unique subsystem.
2217 * This avoids issues with validating controller values
2218 * that can only be true when there is a single unique subsystem.
2219 * There may be multiple and completely independent entities
2220 * that provide discovery controllers.
2222 if (!strcmp(subsysnqn, NVME_DISC_SUBSYS_NAME))
2225 list_for_each_entry(subsys, &nvme_subsystems, entry) {
2226 if (strcmp(subsys->subnqn, subsysnqn))
2228 if (!kref_get_unless_zero(&subsys->ref))
2236 #define SUBSYS_ATTR_RO(_name, _mode, _show) \
2237 struct device_attribute subsys_attr_##_name = \
2238 __ATTR(_name, _mode, _show, NULL)
2240 static ssize_t nvme_subsys_show_nqn(struct device *dev,
2241 struct device_attribute *attr,
2244 struct nvme_subsystem *subsys =
2245 container_of(dev, struct nvme_subsystem, dev);
2247 return snprintf(buf, PAGE_SIZE, "%s\n", subsys->subnqn);
2249 static SUBSYS_ATTR_RO(subsysnqn, S_IRUGO, nvme_subsys_show_nqn);
2251 #define nvme_subsys_show_str_function(field) \
2252 static ssize_t subsys_##field##_show(struct device *dev, \
2253 struct device_attribute *attr, char *buf) \
2255 struct nvme_subsystem *subsys = \
2256 container_of(dev, struct nvme_subsystem, dev); \
2257 return sprintf(buf, "%.*s\n", \
2258 (int)sizeof(subsys->field), subsys->field); \
2260 static SUBSYS_ATTR_RO(field, S_IRUGO, subsys_##field##_show);
2262 nvme_subsys_show_str_function(model);
2263 nvme_subsys_show_str_function(serial);
2264 nvme_subsys_show_str_function(firmware_rev);
2266 static struct attribute *nvme_subsys_attrs[] = {
2267 &subsys_attr_model.attr,
2268 &subsys_attr_serial.attr,
2269 &subsys_attr_firmware_rev.attr,
2270 &subsys_attr_subsysnqn.attr,
2274 static struct attribute_group nvme_subsys_attrs_group = {
2275 .attrs = nvme_subsys_attrs,
2278 static const struct attribute_group *nvme_subsys_attrs_groups[] = {
2279 &nvme_subsys_attrs_group,
2283 static int nvme_active_ctrls(struct nvme_subsystem *subsys)
2286 struct nvme_ctrl *ctrl;
2288 mutex_lock(&subsys->lock);
2289 list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) {
2290 if (ctrl->state != NVME_CTRL_DELETING &&
2291 ctrl->state != NVME_CTRL_DEAD)
2294 mutex_unlock(&subsys->lock);
2299 static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
2301 struct nvme_subsystem *subsys, *found;
2304 subsys = kzalloc(sizeof(*subsys), GFP_KERNEL);
2307 ret = ida_simple_get(&nvme_subsystems_ida, 0, 0, GFP_KERNEL);
2312 subsys->instance = ret;
2313 mutex_init(&subsys->lock);
2314 kref_init(&subsys->ref);
2315 INIT_LIST_HEAD(&subsys->ctrls);
2316 INIT_LIST_HEAD(&subsys->nsheads);
2317 nvme_init_subnqn(subsys, ctrl, id);
2318 memcpy(subsys->serial, id->sn, sizeof(subsys->serial));
2319 memcpy(subsys->model, id->mn, sizeof(subsys->model));
2320 memcpy(subsys->firmware_rev, id->fr, sizeof(subsys->firmware_rev));
2321 subsys->vendor_id = le16_to_cpu(id->vid);
2322 subsys->cmic = id->cmic;
2324 subsys->dev.class = nvme_subsys_class;
2325 subsys->dev.release = nvme_release_subsystem;
2326 subsys->dev.groups = nvme_subsys_attrs_groups;
2327 dev_set_name(&subsys->dev, "nvme-subsys%d", subsys->instance);
2328 device_initialize(&subsys->dev);
2330 mutex_lock(&nvme_subsystems_lock);
2331 found = __nvme_find_get_subsystem(subsys->subnqn);
2334 * Verify that the subsystem actually supports multiple
2335 * controllers, else bail out.
2337 if (!(ctrl->opts && ctrl->opts->discovery_nqn) &&
2338 nvme_active_ctrls(found) && !(id->cmic & (1 << 1))) {
2339 dev_err(ctrl->device,
2340 "ignoring ctrl due to duplicate subnqn (%s).\n",
2342 nvme_put_subsystem(found);
2347 __nvme_release_subsystem(subsys);
2350 ret = device_add(&subsys->dev);
2352 dev_err(ctrl->device,
2353 "failed to register subsystem device.\n");
2356 ida_init(&subsys->ns_ida);
2357 list_add_tail(&subsys->entry, &nvme_subsystems);
2360 ctrl->subsys = subsys;
2361 mutex_unlock(&nvme_subsystems_lock);
2363 if (sysfs_create_link(&subsys->dev.kobj, &ctrl->device->kobj,
2364 dev_name(ctrl->device))) {
2365 dev_err(ctrl->device,
2366 "failed to create sysfs link from subsystem.\n");
2367 /* the transport driver will eventually put the subsystem */
2371 mutex_lock(&subsys->lock);
2372 list_add_tail(&ctrl->subsys_entry, &subsys->ctrls);
2373 mutex_unlock(&subsys->lock);
2378 mutex_unlock(&nvme_subsystems_lock);
2379 put_device(&subsys->dev);
2383 int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp,
2384 void *log, size_t size, u64 offset)
2386 struct nvme_command c = { };
2387 unsigned long dwlen = size / 4 - 1;
2389 c.get_log_page.opcode = nvme_admin_get_log_page;
2390 c.get_log_page.nsid = cpu_to_le32(nsid);
2391 c.get_log_page.lid = log_page;
2392 c.get_log_page.lsp = lsp;
2393 c.get_log_page.numdl = cpu_to_le16(dwlen & ((1 << 16) - 1));
2394 c.get_log_page.numdu = cpu_to_le16(dwlen >> 16);
2395 c.get_log_page.lpol = cpu_to_le32(lower_32_bits(offset));
2396 c.get_log_page.lpou = cpu_to_le32(upper_32_bits(offset));
2398 return nvme_submit_sync_cmd(ctrl->admin_q, &c, log, size);
2401 static int nvme_get_effects_log(struct nvme_ctrl *ctrl)
2406 ctrl->effects = kzalloc(sizeof(*ctrl->effects), GFP_KERNEL);
2411 ret = nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_CMD_EFFECTS, 0,
2412 ctrl->effects, sizeof(*ctrl->effects), 0);
2414 kfree(ctrl->effects);
2415 ctrl->effects = NULL;
2421 * Initialize the cached copies of the Identify data and various controller
2422 * register in our nvme_ctrl structure. This should be called as soon as
2423 * the admin queue is fully up and running.
2425 int nvme_init_identify(struct nvme_ctrl *ctrl)
2427 struct nvme_id_ctrl *id;
2429 int ret, page_shift;
2431 bool prev_apst_enabled;
2433 ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs);
2435 dev_err(ctrl->device, "Reading VS failed (%d)\n", ret);
2439 ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &cap);
2441 dev_err(ctrl->device, "Reading CAP failed (%d)\n", ret);
2444 page_shift = NVME_CAP_MPSMIN(cap) + 12;
2446 if (ctrl->vs >= NVME_VS(1, 1, 0))
2447 ctrl->subsystem = NVME_CAP_NSSRC(cap);
2449 ret = nvme_identify_ctrl(ctrl, &id);
2451 dev_err(ctrl->device, "Identify Controller failed (%d)\n", ret);
2455 if (id->lpa & NVME_CTRL_LPA_CMD_EFFECTS_LOG) {
2456 ret = nvme_get_effects_log(ctrl);
2461 if (!ctrl->identified) {
2464 ret = nvme_init_subsystem(ctrl, id);
2469 * Check for quirks. Quirk can depend on firmware version,
2470 * so, in principle, the set of quirks present can change
2471 * across a reset. As a possible future enhancement, we
2472 * could re-scan for quirks every time we reinitialize
2473 * the device, but we'd have to make sure that the driver
2474 * behaves intelligently if the quirks change.
2476 for (i = 0; i < ARRAY_SIZE(core_quirks); i++) {
2477 if (quirk_matches(id, &core_quirks[i]))
2478 ctrl->quirks |= core_quirks[i].quirks;
2482 if (force_apst && (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS)) {
2483 dev_warn(ctrl->device, "forcibly allowing all power states due to nvme_core.force_apst -- use at your own risk\n");
2484 ctrl->quirks &= ~NVME_QUIRK_NO_DEEPEST_PS;
2487 ctrl->oacs = le16_to_cpu(id->oacs);
2488 ctrl->oncs = le16_to_cpup(&id->oncs);
2489 ctrl->oaes = le32_to_cpu(id->oaes);
2490 atomic_set(&ctrl->abort_limit, id->acl + 1);
2491 ctrl->vwc = id->vwc;
2492 ctrl->cntlid = le16_to_cpup(&id->cntlid);
2494 max_hw_sectors = 1 << (id->mdts + page_shift - 9);
2496 max_hw_sectors = UINT_MAX;
2497 ctrl->max_hw_sectors =
2498 min_not_zero(ctrl->max_hw_sectors, max_hw_sectors);
2500 nvme_set_queue_limits(ctrl, ctrl->admin_q);
2501 ctrl->sgls = le32_to_cpu(id->sgls);
2502 ctrl->kas = le16_to_cpu(id->kas);
2503 ctrl->max_namespaces = le32_to_cpu(id->mnan);
2507 u32 transition_time = le32_to_cpu(id->rtd3e) / 1000000;
2509 ctrl->shutdown_timeout = clamp_t(unsigned int, transition_time,
2510 shutdown_timeout, 60);
2512 if (ctrl->shutdown_timeout != shutdown_timeout)
2513 dev_info(ctrl->device,
2514 "Shutdown timeout set to %u seconds\n",
2515 ctrl->shutdown_timeout);
2517 ctrl->shutdown_timeout = shutdown_timeout;
2519 ctrl->npss = id->npss;
2520 ctrl->apsta = id->apsta;
2521 prev_apst_enabled = ctrl->apst_enabled;
2522 if (ctrl->quirks & NVME_QUIRK_NO_APST) {
2523 if (force_apst && id->apsta) {
2524 dev_warn(ctrl->device, "forcibly allowing APST due to nvme_core.force_apst -- use at your own risk\n");
2525 ctrl->apst_enabled = true;
2527 ctrl->apst_enabled = false;
2530 ctrl->apst_enabled = id->apsta;
2532 memcpy(ctrl->psd, id->psd, sizeof(ctrl->psd));
2534 if (ctrl->ops->flags & NVME_F_FABRICS) {
2535 ctrl->icdoff = le16_to_cpu(id->icdoff);
2536 ctrl->ioccsz = le32_to_cpu(id->ioccsz);
2537 ctrl->iorcsz = le32_to_cpu(id->iorcsz);
2538 ctrl->maxcmd = le16_to_cpu(id->maxcmd);
2541 * In fabrics we need to verify the cntlid matches the
2544 if (ctrl->cntlid != le16_to_cpu(id->cntlid)) {
2549 if (!ctrl->opts->discovery_nqn && !ctrl->kas) {
2550 dev_err(ctrl->device,
2551 "keep-alive support is mandatory for fabrics\n");
2556 ctrl->cntlid = le16_to_cpu(id->cntlid);
2557 ctrl->hmpre = le32_to_cpu(id->hmpre);
2558 ctrl->hmmin = le32_to_cpu(id->hmmin);
2559 ctrl->hmminds = le32_to_cpu(id->hmminds);
2560 ctrl->hmmaxd = le16_to_cpu(id->hmmaxd);
2563 ret = nvme_mpath_init(ctrl, id);
2569 if (ctrl->apst_enabled && !prev_apst_enabled)
2570 dev_pm_qos_expose_latency_tolerance(ctrl->device);
2571 else if (!ctrl->apst_enabled && prev_apst_enabled)
2572 dev_pm_qos_hide_latency_tolerance(ctrl->device);
2574 ret = nvme_configure_apst(ctrl);
2578 ret = nvme_configure_timestamp(ctrl);
2582 ret = nvme_configure_directives(ctrl);
2586 ctrl->identified = true;
2594 EXPORT_SYMBOL_GPL(nvme_init_identify);
2596 static int nvme_dev_open(struct inode *inode, struct file *file)
2598 struct nvme_ctrl *ctrl =
2599 container_of(inode->i_cdev, struct nvme_ctrl, cdev);
2601 switch (ctrl->state) {
2602 case NVME_CTRL_LIVE:
2603 case NVME_CTRL_ADMIN_ONLY:
2606 return -EWOULDBLOCK;
2609 nvme_get_ctrl(ctrl);
2610 if (!try_module_get(ctrl->ops->module)) {
2611 nvme_put_ctrl(ctrl);
2615 file->private_data = ctrl;
2619 static int nvme_dev_release(struct inode *inode, struct file *file)
2621 struct nvme_ctrl *ctrl =
2622 container_of(inode->i_cdev, struct nvme_ctrl, cdev);
2624 module_put(ctrl->ops->module);
2625 nvme_put_ctrl(ctrl);
2629 static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp)
2634 down_read(&ctrl->namespaces_rwsem);
2635 if (list_empty(&ctrl->namespaces)) {
2640 ns = list_first_entry(&ctrl->namespaces, struct nvme_ns, list);
2641 if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) {
2642 dev_warn(ctrl->device,
2643 "NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n");
2648 dev_warn(ctrl->device,
2649 "using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n");
2650 kref_get(&ns->kref);
2651 up_read(&ctrl->namespaces_rwsem);
2653 ret = nvme_user_cmd(ctrl, ns, argp);
2658 up_read(&ctrl->namespaces_rwsem);
2662 static long nvme_dev_ioctl(struct file *file, unsigned int cmd,
2665 struct nvme_ctrl *ctrl = file->private_data;
2666 void __user *argp = (void __user *)arg;
2669 case NVME_IOCTL_ADMIN_CMD:
2670 return nvme_user_cmd(ctrl, NULL, argp);
2671 case NVME_IOCTL_IO_CMD:
2672 return nvme_dev_user_cmd(ctrl, argp);
2673 case NVME_IOCTL_RESET:
2674 dev_warn(ctrl->device, "resetting controller\n");
2675 return nvme_reset_ctrl_sync(ctrl);
2676 case NVME_IOCTL_SUBSYS_RESET:
2677 return nvme_reset_subsystem(ctrl);
2678 case NVME_IOCTL_RESCAN:
2679 nvme_queue_scan(ctrl);
2686 static const struct file_operations nvme_dev_fops = {
2687 .owner = THIS_MODULE,
2688 .open = nvme_dev_open,
2689 .release = nvme_dev_release,
2690 .unlocked_ioctl = nvme_dev_ioctl,
2691 .compat_ioctl = nvme_dev_ioctl,
2694 static ssize_t nvme_sysfs_reset(struct device *dev,
2695 struct device_attribute *attr, const char *buf,
2698 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
2701 ret = nvme_reset_ctrl_sync(ctrl);
2706 static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset);
2708 static ssize_t nvme_sysfs_rescan(struct device *dev,
2709 struct device_attribute *attr, const char *buf,
2712 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
2714 nvme_queue_scan(ctrl);
2717 static DEVICE_ATTR(rescan_controller, S_IWUSR, NULL, nvme_sysfs_rescan);
2719 static inline struct nvme_ns_head *dev_to_ns_head(struct device *dev)
2721 struct gendisk *disk = dev_to_disk(dev);
2723 if (disk->fops == &nvme_fops)
2724 return nvme_get_ns_from_dev(dev)->head;
2726 return disk->private_data;
2729 static ssize_t wwid_show(struct device *dev, struct device_attribute *attr,
2732 struct nvme_ns_head *head = dev_to_ns_head(dev);
2733 struct nvme_ns_ids *ids = &head->ids;
2734 struct nvme_subsystem *subsys = head->subsys;
2735 int serial_len = sizeof(subsys->serial);
2736 int model_len = sizeof(subsys->model);
2738 if (!uuid_is_null(&ids->uuid))
2739 return sprintf(buf, "uuid.%pU\n", &ids->uuid);
2741 if (memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
2742 return sprintf(buf, "eui.%16phN\n", ids->nguid);
2744 if (memchr_inv(ids->eui64, 0, sizeof(ids->eui64)))
2745 return sprintf(buf, "eui.%8phN\n", ids->eui64);
2747 while (serial_len > 0 && (subsys->serial[serial_len - 1] == ' ' ||
2748 subsys->serial[serial_len - 1] == '\0'))
2750 while (model_len > 0 && (subsys->model[model_len - 1] == ' ' ||
2751 subsys->model[model_len - 1] == '\0'))
2754 return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", subsys->vendor_id,
2755 serial_len, subsys->serial, model_len, subsys->model,
2758 static DEVICE_ATTR_RO(wwid);
2760 static ssize_t nguid_show(struct device *dev, struct device_attribute *attr,
2763 return sprintf(buf, "%pU\n", dev_to_ns_head(dev)->ids.nguid);
2765 static DEVICE_ATTR_RO(nguid);
2767 static ssize_t uuid_show(struct device *dev, struct device_attribute *attr,
2770 struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids;
2772 /* For backward compatibility expose the NGUID to userspace if
2773 * we have no UUID set
2775 if (uuid_is_null(&ids->uuid)) {
2776 printk_ratelimited(KERN_WARNING
2777 "No UUID available providing old NGUID\n");
2778 return sprintf(buf, "%pU\n", ids->nguid);
2780 return sprintf(buf, "%pU\n", &ids->uuid);
2782 static DEVICE_ATTR_RO(uuid);
2784 static ssize_t eui_show(struct device *dev, struct device_attribute *attr,
2787 return sprintf(buf, "%8ph\n", dev_to_ns_head(dev)->ids.eui64);
2789 static DEVICE_ATTR_RO(eui);
2791 static ssize_t nsid_show(struct device *dev, struct device_attribute *attr,
2794 return sprintf(buf, "%d\n", dev_to_ns_head(dev)->ns_id);
2796 static DEVICE_ATTR_RO(nsid);
2798 static struct attribute *nvme_ns_id_attrs[] = {
2799 &dev_attr_wwid.attr,
2800 &dev_attr_uuid.attr,
2801 &dev_attr_nguid.attr,
2803 &dev_attr_nsid.attr,
2804 #ifdef CONFIG_NVME_MULTIPATH
2805 &dev_attr_ana_grpid.attr,
2806 &dev_attr_ana_state.attr,
2811 static umode_t nvme_ns_id_attrs_are_visible(struct kobject *kobj,
2812 struct attribute *a, int n)
2814 struct device *dev = container_of(kobj, struct device, kobj);
2815 struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids;
2817 if (a == &dev_attr_uuid.attr) {
2818 if (uuid_is_null(&ids->uuid) &&
2819 !memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
2822 if (a == &dev_attr_nguid.attr) {
2823 if (!memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
2826 if (a == &dev_attr_eui.attr) {
2827 if (!memchr_inv(ids->eui64, 0, sizeof(ids->eui64)))
2830 #ifdef CONFIG_NVME_MULTIPATH
2831 if (a == &dev_attr_ana_grpid.attr || a == &dev_attr_ana_state.attr) {
2832 if (dev_to_disk(dev)->fops != &nvme_fops) /* per-path attr */
2834 if (!nvme_ctrl_use_ana(nvme_get_ns_from_dev(dev)->ctrl))
2841 const struct attribute_group nvme_ns_id_attr_group = {
2842 .attrs = nvme_ns_id_attrs,
2843 .is_visible = nvme_ns_id_attrs_are_visible,
2846 const struct attribute_group *nvme_ns_id_attr_groups[] = {
2847 &nvme_ns_id_attr_group,
2849 &nvme_nvm_attr_group,
2854 #define nvme_show_str_function(field) \
2855 static ssize_t field##_show(struct device *dev, \
2856 struct device_attribute *attr, char *buf) \
2858 struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \
2859 return sprintf(buf, "%.*s\n", \
2860 (int)sizeof(ctrl->subsys->field), ctrl->subsys->field); \
2862 static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
2864 nvme_show_str_function(model);
2865 nvme_show_str_function(serial);
2866 nvme_show_str_function(firmware_rev);
2868 #define nvme_show_int_function(field) \
2869 static ssize_t field##_show(struct device *dev, \
2870 struct device_attribute *attr, char *buf) \
2872 struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \
2873 return sprintf(buf, "%d\n", ctrl->field); \
2875 static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
2877 nvme_show_int_function(cntlid);
2879 static ssize_t nvme_sysfs_delete(struct device *dev,
2880 struct device_attribute *attr, const char *buf,
2883 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
2885 /* Can't delete non-created controllers */
2889 if (device_remove_file_self(dev, attr))
2890 nvme_delete_ctrl_sync(ctrl);
2893 static DEVICE_ATTR(delete_controller, S_IWUSR, NULL, nvme_sysfs_delete);
2895 static ssize_t nvme_sysfs_show_transport(struct device *dev,
2896 struct device_attribute *attr,
2899 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
2901 return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->ops->name);
2903 static DEVICE_ATTR(transport, S_IRUGO, nvme_sysfs_show_transport, NULL);
2905 static ssize_t nvme_sysfs_show_state(struct device *dev,
2906 struct device_attribute *attr,
2909 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
2910 static const char *const state_name[] = {
2911 [NVME_CTRL_NEW] = "new",
2912 [NVME_CTRL_LIVE] = "live",
2913 [NVME_CTRL_ADMIN_ONLY] = "only-admin",
2914 [NVME_CTRL_RESETTING] = "resetting",
2915 [NVME_CTRL_CONNECTING] = "connecting",
2916 [NVME_CTRL_DELETING] = "deleting",
2917 [NVME_CTRL_DEAD] = "dead",
2920 if ((unsigned)ctrl->state < ARRAY_SIZE(state_name) &&
2921 state_name[ctrl->state])
2922 return sprintf(buf, "%s\n", state_name[ctrl->state]);
2924 return sprintf(buf, "unknown state\n");
2927 static DEVICE_ATTR(state, S_IRUGO, nvme_sysfs_show_state, NULL);
2929 static ssize_t nvme_sysfs_show_subsysnqn(struct device *dev,
2930 struct device_attribute *attr,
2933 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
2935 return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->subsys->subnqn);
2937 static DEVICE_ATTR(subsysnqn, S_IRUGO, nvme_sysfs_show_subsysnqn, NULL);
2939 static ssize_t nvme_sysfs_show_address(struct device *dev,
2940 struct device_attribute *attr,
2943 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
2945 return ctrl->ops->get_address(ctrl, buf, PAGE_SIZE);
2947 static DEVICE_ATTR(address, S_IRUGO, nvme_sysfs_show_address, NULL);
2949 static struct attribute *nvme_dev_attrs[] = {
2950 &dev_attr_reset_controller.attr,
2951 &dev_attr_rescan_controller.attr,
2952 &dev_attr_model.attr,
2953 &dev_attr_serial.attr,
2954 &dev_attr_firmware_rev.attr,
2955 &dev_attr_cntlid.attr,
2956 &dev_attr_delete_controller.attr,
2957 &dev_attr_transport.attr,
2958 &dev_attr_subsysnqn.attr,
2959 &dev_attr_address.attr,
2960 &dev_attr_state.attr,
2964 static umode_t nvme_dev_attrs_are_visible(struct kobject *kobj,
2965 struct attribute *a, int n)
2967 struct device *dev = container_of(kobj, struct device, kobj);
2968 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
2970 if (a == &dev_attr_delete_controller.attr && !ctrl->ops->delete_ctrl)
2972 if (a == &dev_attr_address.attr && !ctrl->ops->get_address)
2978 static struct attribute_group nvme_dev_attrs_group = {
2979 .attrs = nvme_dev_attrs,
2980 .is_visible = nvme_dev_attrs_are_visible,
2983 static const struct attribute_group *nvme_dev_attr_groups[] = {
2984 &nvme_dev_attrs_group,
2988 static struct nvme_ns_head *__nvme_find_ns_head(struct nvme_subsystem *subsys,
2991 struct nvme_ns_head *h;
2993 lockdep_assert_held(&subsys->lock);
2995 list_for_each_entry(h, &subsys->nsheads, entry) {
2996 if (h->ns_id == nsid && kref_get_unless_zero(&h->ref))
3003 static int __nvme_check_ids(struct nvme_subsystem *subsys,
3004 struct nvme_ns_head *new)
3006 struct nvme_ns_head *h;
3008 lockdep_assert_held(&subsys->lock);
3010 list_for_each_entry(h, &subsys->nsheads, entry) {
3011 if (nvme_ns_ids_valid(&new->ids) &&
3012 !list_empty(&h->list) &&
3013 nvme_ns_ids_equal(&new->ids, &h->ids))
3020 static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl,
3021 unsigned nsid, struct nvme_id_ns *id)
3023 struct nvme_ns_head *head;
3026 head = kzalloc(sizeof(*head), GFP_KERNEL);
3029 ret = ida_simple_get(&ctrl->subsys->ns_ida, 1, 0, GFP_KERNEL);
3032 head->instance = ret;
3033 INIT_LIST_HEAD(&head->list);
3034 ret = init_srcu_struct(&head->srcu);
3036 goto out_ida_remove;
3037 head->subsys = ctrl->subsys;
3039 kref_init(&head->ref);
3041 nvme_report_ns_ids(ctrl, nsid, id, &head->ids);
3043 ret = __nvme_check_ids(ctrl->subsys, head);
3045 dev_err(ctrl->device,
3046 "duplicate IDs for nsid %d\n", nsid);
3047 goto out_cleanup_srcu;
3050 ret = nvme_mpath_alloc_disk(ctrl, head);
3052 goto out_cleanup_srcu;
3054 list_add_tail(&head->entry, &ctrl->subsys->nsheads);
3056 kref_get(&ctrl->subsys->ref);
3060 cleanup_srcu_struct(&head->srcu);
3062 ida_simple_remove(&ctrl->subsys->ns_ida, head->instance);
3066 return ERR_PTR(ret);
3069 static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid,
3070 struct nvme_id_ns *id)
3072 struct nvme_ctrl *ctrl = ns->ctrl;
3073 bool is_shared = id->nmic & (1 << 0);
3074 struct nvme_ns_head *head = NULL;
3077 mutex_lock(&ctrl->subsys->lock);
3079 head = __nvme_find_ns_head(ctrl->subsys, nsid);
3081 head = nvme_alloc_ns_head(ctrl, nsid, id);
3083 ret = PTR_ERR(head);
3087 struct nvme_ns_ids ids;
3089 nvme_report_ns_ids(ctrl, nsid, id, &ids);
3090 if (!nvme_ns_ids_equal(&head->ids, &ids)) {
3091 dev_err(ctrl->device,
3092 "IDs don't match for shared namespace %d\n",
3099 list_add_tail(&ns->siblings, &head->list);
3103 mutex_unlock(&ctrl->subsys->lock);
3107 static int ns_cmp(void *priv, struct list_head *a, struct list_head *b)
3109 struct nvme_ns *nsa = container_of(a, struct nvme_ns, list);
3110 struct nvme_ns *nsb = container_of(b, struct nvme_ns, list);
3112 return nsa->head->ns_id - nsb->head->ns_id;
3115 static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid)
3117 struct nvme_ns *ns, *ret = NULL;
3119 down_read(&ctrl->namespaces_rwsem);
3120 list_for_each_entry(ns, &ctrl->namespaces, list) {
3121 if (ns->head->ns_id == nsid) {
3122 if (!kref_get_unless_zero(&ns->kref))
3127 if (ns->head->ns_id > nsid)
3130 up_read(&ctrl->namespaces_rwsem);
3134 static int nvme_setup_streams_ns(struct nvme_ctrl *ctrl, struct nvme_ns *ns)
3136 struct streams_directive_params s;
3139 if (!ctrl->nr_streams)
3142 ret = nvme_get_stream_params(ctrl, &s, ns->head->ns_id);
3146 ns->sws = le32_to_cpu(s.sws);
3147 ns->sgs = le16_to_cpu(s.sgs);
3150 unsigned int bs = 1 << ns->lba_shift;
3152 blk_queue_io_min(ns->queue, bs * ns->sws);
3154 blk_queue_io_opt(ns->queue, bs * ns->sws * ns->sgs);
3160 static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
3163 struct gendisk *disk;
3164 struct nvme_id_ns *id;
3165 char disk_name[DISK_NAME_LEN];
3166 int node = dev_to_node(ctrl->dev), flags = GENHD_FL_EXT_DEVT;
3168 ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node);
3172 ns->queue = blk_mq_init_queue(ctrl->tagset);
3173 if (IS_ERR(ns->queue))
3175 blk_queue_flag_set(QUEUE_FLAG_NONROT, ns->queue);
3176 ns->queue->queuedata = ns;
3179 kref_init(&ns->kref);
3180 ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */
3182 blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
3183 nvme_set_queue_limits(ctrl, ns->queue);
3185 id = nvme_identify_ns(ctrl, nsid);
3187 goto out_free_queue;
3192 if (nvme_init_ns_head(ns, nsid, id))
3194 nvme_setup_streams_ns(ctrl, ns);
3195 nvme_set_disk_name(disk_name, ns, ctrl, &flags);
3197 if ((ctrl->quirks & NVME_QUIRK_LIGHTNVM) && id->vs[0] == 0x1) {
3198 if (nvme_nvm_register(ns, disk_name, node)) {
3199 dev_warn(ctrl->device, "LightNVM init failure\n");
3204 disk = alloc_disk_node(0, node);
3208 disk->fops = &nvme_fops;
3209 disk->private_data = ns;
3210 disk->queue = ns->queue;
3211 disk->flags = flags;
3212 memcpy(disk->disk_name, disk_name, DISK_NAME_LEN);
3215 __nvme_revalidate_disk(disk, id);
3217 down_write(&ctrl->namespaces_rwsem);
3218 list_add_tail(&ns->list, &ctrl->namespaces);
3219 up_write(&ctrl->namespaces_rwsem);
3221 nvme_get_ctrl(ctrl);
3223 device_add_disk(ctrl->device, ns->disk, nvme_ns_id_attr_groups);
3225 nvme_mpath_add_disk(ns, id);
3226 nvme_fault_inject_init(ns);
3231 mutex_lock(&ctrl->subsys->lock);
3232 list_del_rcu(&ns->siblings);
3233 mutex_unlock(&ctrl->subsys->lock);
3237 blk_cleanup_queue(ns->queue);
3242 static void nvme_ns_remove(struct nvme_ns *ns)
3244 if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags))
3247 nvme_fault_inject_fini(ns);
3249 mutex_lock(&ns->ctrl->subsys->lock);
3250 list_del_rcu(&ns->siblings);
3251 mutex_unlock(&ns->ctrl->subsys->lock);
3252 synchronize_rcu(); /* guarantee not available in head->list */
3253 nvme_mpath_clear_current_path(ns);
3254 synchronize_srcu(&ns->head->srcu); /* wait for concurrent submissions */
3256 if (ns->disk && ns->disk->flags & GENHD_FL_UP) {
3257 del_gendisk(ns->disk);
3258 blk_cleanup_queue(ns->queue);
3259 if (blk_get_integrity(ns->disk))
3260 blk_integrity_unregister(ns->disk);
3263 down_write(&ns->ctrl->namespaces_rwsem);
3264 list_del_init(&ns->list);
3265 up_write(&ns->ctrl->namespaces_rwsem);
3267 nvme_mpath_check_last_path(ns);
3271 static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid)
3275 ns = nvme_find_get_ns(ctrl, nsid);
3277 if (ns->disk && revalidate_disk(ns->disk))
3281 nvme_alloc_ns(ctrl, nsid);
3284 static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl,
3287 struct nvme_ns *ns, *next;
3290 down_write(&ctrl->namespaces_rwsem);
3291 list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) {
3292 if (ns->head->ns_id > nsid || test_bit(NVME_NS_DEAD, &ns->flags))
3293 list_move_tail(&ns->list, &rm_list);
3295 up_write(&ctrl->namespaces_rwsem);
3297 list_for_each_entry_safe(ns, next, &rm_list, list)
3302 static int nvme_scan_ns_list(struct nvme_ctrl *ctrl, unsigned nn)
3306 unsigned i, j, nsid, prev = 0;
3307 unsigned num_lists = DIV_ROUND_UP_ULL((u64)nn, 1024);
3310 ns_list = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL);
3314 for (i = 0; i < num_lists; i++) {
3315 ret = nvme_identify_ns_list(ctrl, prev, ns_list);
3319 for (j = 0; j < min(nn, 1024U); j++) {
3320 nsid = le32_to_cpu(ns_list[j]);
3324 nvme_validate_ns(ctrl, nsid);
3326 while (++prev < nsid) {
3327 ns = nvme_find_get_ns(ctrl, prev);
3337 nvme_remove_invalid_namespaces(ctrl, prev);
3343 static void nvme_scan_ns_sequential(struct nvme_ctrl *ctrl, unsigned nn)
3347 for (i = 1; i <= nn; i++)
3348 nvme_validate_ns(ctrl, i);
3350 nvme_remove_invalid_namespaces(ctrl, nn);
3353 static void nvme_clear_changed_ns_log(struct nvme_ctrl *ctrl)
3355 size_t log_size = NVME_MAX_CHANGED_NAMESPACES * sizeof(__le32);
3359 log = kzalloc(log_size, GFP_KERNEL);
3364 * We need to read the log to clear the AEN, but we don't want to rely
3365 * on it for the changed namespace information as userspace could have
3366 * raced with us in reading the log page, which could cause us to miss
3369 error = nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_CHANGED_NS, 0, log,
3372 dev_warn(ctrl->device,
3373 "reading changed ns log failed: %d\n", error);
3378 static void nvme_scan_work(struct work_struct *work)
3380 struct nvme_ctrl *ctrl =
3381 container_of(work, struct nvme_ctrl, scan_work);
3382 struct nvme_id_ctrl *id;
3385 if (ctrl->state != NVME_CTRL_LIVE)
3388 WARN_ON_ONCE(!ctrl->tagset);
3390 if (test_and_clear_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events)) {
3391 dev_info(ctrl->device, "rescanning namespaces.\n");
3392 nvme_clear_changed_ns_log(ctrl);
3395 if (nvme_identify_ctrl(ctrl, &id))
3398 mutex_lock(&ctrl->scan_lock);
3399 nn = le32_to_cpu(id->nn);
3400 if (!nvme_ctrl_limited_cns(ctrl)) {
3401 if (!nvme_scan_ns_list(ctrl, nn))
3404 nvme_scan_ns_sequential(ctrl, nn);
3406 mutex_unlock(&ctrl->scan_lock);
3408 down_write(&ctrl->namespaces_rwsem);
3409 list_sort(NULL, &ctrl->namespaces, ns_cmp);
3410 up_write(&ctrl->namespaces_rwsem);
3414 * This function iterates the namespace list unlocked to allow recovery from
3415 * controller failure. It is up to the caller to ensure the namespace list is
3416 * not modified by scan work while this function is executing.
3418 void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
3420 struct nvme_ns *ns, *next;
3423 /* prevent racing with ns scanning */
3424 flush_work(&ctrl->scan_work);
3427 * The dead states indicates the controller was not gracefully
3428 * disconnected. In that case, we won't be able to flush any data while
3429 * removing the namespaces' disks; fail all the queues now to avoid
3430 * potentially having to clean up the failed sync later.
3432 if (ctrl->state == NVME_CTRL_DEAD)
3433 nvme_kill_queues(ctrl);
3435 down_write(&ctrl->namespaces_rwsem);
3436 list_splice_init(&ctrl->namespaces, &ns_list);
3437 up_write(&ctrl->namespaces_rwsem);
3439 list_for_each_entry_safe(ns, next, &ns_list, list)
3442 EXPORT_SYMBOL_GPL(nvme_remove_namespaces);
3444 static void nvme_aen_uevent(struct nvme_ctrl *ctrl)
3446 char *envp[2] = { NULL, NULL };
3447 u32 aen_result = ctrl->aen_result;
3449 ctrl->aen_result = 0;
3453 envp[0] = kasprintf(GFP_KERNEL, "NVME_AEN=%#08x", aen_result);
3456 kobject_uevent_env(&ctrl->device->kobj, KOBJ_CHANGE, envp);
3460 static void nvme_async_event_work(struct work_struct *work)
3462 struct nvme_ctrl *ctrl =
3463 container_of(work, struct nvme_ctrl, async_event_work);
3465 nvme_aen_uevent(ctrl);
3466 ctrl->ops->submit_async_event(ctrl);
3469 static bool nvme_ctrl_pp_status(struct nvme_ctrl *ctrl)
3474 if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts))
3480 return ((ctrl->ctrl_config & NVME_CC_ENABLE) && (csts & NVME_CSTS_PP));
3483 static void nvme_get_fw_slot_info(struct nvme_ctrl *ctrl)
3485 struct nvme_fw_slot_info_log *log;
3487 log = kmalloc(sizeof(*log), GFP_KERNEL);
3491 if (nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_FW_SLOT, 0, log,
3493 dev_warn(ctrl->device, "Get FW SLOT INFO log error\n");
3497 static void nvme_fw_act_work(struct work_struct *work)
3499 struct nvme_ctrl *ctrl = container_of(work,
3500 struct nvme_ctrl, fw_act_work);
3501 unsigned long fw_act_timeout;
3504 fw_act_timeout = jiffies +
3505 msecs_to_jiffies(ctrl->mtfa * 100);
3507 fw_act_timeout = jiffies +
3508 msecs_to_jiffies(admin_timeout * 1000);
3510 nvme_stop_queues(ctrl);
3511 while (nvme_ctrl_pp_status(ctrl)) {
3512 if (time_after(jiffies, fw_act_timeout)) {
3513 dev_warn(ctrl->device,
3514 "Fw activation timeout, reset controller\n");
3515 nvme_reset_ctrl(ctrl);
3521 if (ctrl->state != NVME_CTRL_LIVE)
3524 nvme_start_queues(ctrl);
3525 /* read FW slot information to clear the AER */
3526 nvme_get_fw_slot_info(ctrl);
3529 static void nvme_handle_aen_notice(struct nvme_ctrl *ctrl, u32 result)
3531 switch ((result & 0xff00) >> 8) {
3532 case NVME_AER_NOTICE_NS_CHANGED:
3533 set_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events);
3534 nvme_queue_scan(ctrl);
3536 case NVME_AER_NOTICE_FW_ACT_STARTING:
3537 queue_work(nvme_wq, &ctrl->fw_act_work);
3539 #ifdef CONFIG_NVME_MULTIPATH
3540 case NVME_AER_NOTICE_ANA:
3541 if (!ctrl->ana_log_buf)
3543 queue_work(nvme_wq, &ctrl->ana_work);
3547 dev_warn(ctrl->device, "async event result %08x\n", result);
3551 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
3552 volatile union nvme_result *res)
3554 u32 result = le32_to_cpu(res->u32);
3556 if (le16_to_cpu(status) >> 1 != NVME_SC_SUCCESS)
3559 switch (result & 0x7) {
3560 case NVME_AER_NOTICE:
3561 nvme_handle_aen_notice(ctrl, result);
3563 case NVME_AER_ERROR:
3564 case NVME_AER_SMART:
3567 ctrl->aen_result = result;
3572 queue_work(nvme_wq, &ctrl->async_event_work);
3574 EXPORT_SYMBOL_GPL(nvme_complete_async_event);
3576 void nvme_stop_ctrl(struct nvme_ctrl *ctrl)
3578 nvme_mpath_stop(ctrl);
3579 nvme_stop_keep_alive(ctrl);
3580 flush_work(&ctrl->async_event_work);
3581 cancel_work_sync(&ctrl->fw_act_work);
3582 if (ctrl->ops->stop_ctrl)
3583 ctrl->ops->stop_ctrl(ctrl);
3585 EXPORT_SYMBOL_GPL(nvme_stop_ctrl);
3587 void nvme_start_ctrl(struct nvme_ctrl *ctrl)
3590 nvme_start_keep_alive(ctrl);
3592 if (ctrl->queue_count > 1) {
3593 nvme_queue_scan(ctrl);
3594 nvme_enable_aen(ctrl);
3595 queue_work(nvme_wq, &ctrl->async_event_work);
3596 nvme_start_queues(ctrl);
3598 ctrl->created = true;
3600 EXPORT_SYMBOL_GPL(nvme_start_ctrl);
3602 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl)
3604 dev_pm_qos_hide_latency_tolerance(ctrl->device);
3605 cdev_device_del(&ctrl->cdev, ctrl->device);
3607 EXPORT_SYMBOL_GPL(nvme_uninit_ctrl);
3609 static void nvme_free_ctrl(struct device *dev)
3611 struct nvme_ctrl *ctrl =
3612 container_of(dev, struct nvme_ctrl, ctrl_device);
3613 struct nvme_subsystem *subsys = ctrl->subsys;
3615 ida_simple_remove(&nvme_instance_ida, ctrl->instance);
3616 kfree(ctrl->effects);
3617 nvme_mpath_uninit(ctrl);
3618 __free_page(ctrl->discard_page);
3621 mutex_lock(&subsys->lock);
3622 list_del(&ctrl->subsys_entry);
3623 mutex_unlock(&subsys->lock);
3624 sysfs_remove_link(&subsys->dev.kobj, dev_name(ctrl->device));
3627 ctrl->ops->free_ctrl(ctrl);
3630 nvme_put_subsystem(subsys);
3634 * Initialize a NVMe controller structures. This needs to be called during
3635 * earliest initialization so that we have the initialized structured around
3638 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
3639 const struct nvme_ctrl_ops *ops, unsigned long quirks)
3643 ctrl->state = NVME_CTRL_NEW;
3644 spin_lock_init(&ctrl->lock);
3645 mutex_init(&ctrl->scan_lock);
3646 INIT_LIST_HEAD(&ctrl->namespaces);
3647 init_rwsem(&ctrl->namespaces_rwsem);
3650 ctrl->quirks = quirks;
3651 INIT_WORK(&ctrl->scan_work, nvme_scan_work);
3652 INIT_WORK(&ctrl->async_event_work, nvme_async_event_work);
3653 INIT_WORK(&ctrl->fw_act_work, nvme_fw_act_work);
3654 INIT_WORK(&ctrl->delete_work, nvme_delete_ctrl_work);
3656 INIT_DELAYED_WORK(&ctrl->ka_work, nvme_keep_alive_work);
3657 memset(&ctrl->ka_cmd, 0, sizeof(ctrl->ka_cmd));
3658 ctrl->ka_cmd.common.opcode = nvme_admin_keep_alive;
3660 BUILD_BUG_ON(NVME_DSM_MAX_RANGES * sizeof(struct nvme_dsm_range) >
3662 ctrl->discard_page = alloc_page(GFP_KERNEL);
3663 if (!ctrl->discard_page) {
3668 ret = ida_simple_get(&nvme_instance_ida, 0, 0, GFP_KERNEL);
3671 ctrl->instance = ret;
3673 device_initialize(&ctrl->ctrl_device);
3674 ctrl->device = &ctrl->ctrl_device;
3675 ctrl->device->devt = MKDEV(MAJOR(nvme_chr_devt), ctrl->instance);
3676 ctrl->device->class = nvme_class;
3677 ctrl->device->parent = ctrl->dev;
3678 ctrl->device->groups = nvme_dev_attr_groups;
3679 ctrl->device->release = nvme_free_ctrl;
3680 dev_set_drvdata(ctrl->device, ctrl);
3681 ret = dev_set_name(ctrl->device, "nvme%d", ctrl->instance);
3683 goto out_release_instance;
3685 cdev_init(&ctrl->cdev, &nvme_dev_fops);
3686 ctrl->cdev.owner = ops->module;
3687 ret = cdev_device_add(&ctrl->cdev, ctrl->device);
3692 * Initialize latency tolerance controls. The sysfs files won't
3693 * be visible to userspace unless the device actually supports APST.
3695 ctrl->device->power.set_latency_tolerance = nvme_set_latency_tolerance;
3696 dev_pm_qos_update_user_latency_tolerance(ctrl->device,
3697 min(default_ps_max_latency_us, (unsigned long)S32_MAX));
3701 kfree_const(ctrl->device->kobj.name);
3702 out_release_instance:
3703 ida_simple_remove(&nvme_instance_ida, ctrl->instance);
3705 if (ctrl->discard_page)
3706 __free_page(ctrl->discard_page);
3709 EXPORT_SYMBOL_GPL(nvme_init_ctrl);
3712 * nvme_kill_queues(): Ends all namespace queues
3713 * @ctrl: the dead controller that needs to end
3715 * Call this function when the driver determines it is unable to get the
3716 * controller in a state capable of servicing IO.
3718 void nvme_kill_queues(struct nvme_ctrl *ctrl)
3722 down_read(&ctrl->namespaces_rwsem);
3724 /* Forcibly unquiesce queues to avoid blocking dispatch */
3725 if (ctrl->admin_q && !blk_queue_dying(ctrl->admin_q))
3726 blk_mq_unquiesce_queue(ctrl->admin_q);
3728 list_for_each_entry(ns, &ctrl->namespaces, list)
3729 nvme_set_queue_dying(ns);
3731 up_read(&ctrl->namespaces_rwsem);
3733 EXPORT_SYMBOL_GPL(nvme_kill_queues);
3735 void nvme_unfreeze(struct nvme_ctrl *ctrl)
3739 down_read(&ctrl->namespaces_rwsem);
3740 list_for_each_entry(ns, &ctrl->namespaces, list)
3741 blk_mq_unfreeze_queue(ns->queue);
3742 up_read(&ctrl->namespaces_rwsem);
3744 EXPORT_SYMBOL_GPL(nvme_unfreeze);
3746 void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout)
3750 down_read(&ctrl->namespaces_rwsem);
3751 list_for_each_entry(ns, &ctrl->namespaces, list) {
3752 timeout = blk_mq_freeze_queue_wait_timeout(ns->queue, timeout);
3756 up_read(&ctrl->namespaces_rwsem);
3758 EXPORT_SYMBOL_GPL(nvme_wait_freeze_timeout);
3760 void nvme_wait_freeze(struct nvme_ctrl *ctrl)
3764 down_read(&ctrl->namespaces_rwsem);
3765 list_for_each_entry(ns, &ctrl->namespaces, list)
3766 blk_mq_freeze_queue_wait(ns->queue);
3767 up_read(&ctrl->namespaces_rwsem);
3769 EXPORT_SYMBOL_GPL(nvme_wait_freeze);
3771 void nvme_start_freeze(struct nvme_ctrl *ctrl)
3775 down_read(&ctrl->namespaces_rwsem);
3776 list_for_each_entry(ns, &ctrl->namespaces, list)
3777 blk_freeze_queue_start(ns->queue);
3778 up_read(&ctrl->namespaces_rwsem);
3780 EXPORT_SYMBOL_GPL(nvme_start_freeze);
3782 void nvme_stop_queues(struct nvme_ctrl *ctrl)
3786 down_read(&ctrl->namespaces_rwsem);
3787 list_for_each_entry(ns, &ctrl->namespaces, list)
3788 blk_mq_quiesce_queue(ns->queue);
3789 up_read(&ctrl->namespaces_rwsem);
3791 EXPORT_SYMBOL_GPL(nvme_stop_queues);
3793 void nvme_start_queues(struct nvme_ctrl *ctrl)
3797 down_read(&ctrl->namespaces_rwsem);
3798 list_for_each_entry(ns, &ctrl->namespaces, list)
3799 blk_mq_unquiesce_queue(ns->queue);
3800 up_read(&ctrl->namespaces_rwsem);
3802 EXPORT_SYMBOL_GPL(nvme_start_queues);
3804 int __init nvme_core_init(void)
3806 int result = -ENOMEM;
3808 nvme_wq = alloc_workqueue("nvme-wq",
3809 WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
3813 nvme_reset_wq = alloc_workqueue("nvme-reset-wq",
3814 WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
3818 nvme_delete_wq = alloc_workqueue("nvme-delete-wq",
3819 WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
3820 if (!nvme_delete_wq)
3821 goto destroy_reset_wq;
3823 result = alloc_chrdev_region(&nvme_chr_devt, 0, NVME_MINORS, "nvme");
3825 goto destroy_delete_wq;
3827 nvme_class = class_create(THIS_MODULE, "nvme");
3828 if (IS_ERR(nvme_class)) {
3829 result = PTR_ERR(nvme_class);
3830 goto unregister_chrdev;
3833 nvme_subsys_class = class_create(THIS_MODULE, "nvme-subsystem");
3834 if (IS_ERR(nvme_subsys_class)) {
3835 result = PTR_ERR(nvme_subsys_class);
3841 class_destroy(nvme_class);
3843 unregister_chrdev_region(nvme_chr_devt, NVME_MINORS);
3845 destroy_workqueue(nvme_delete_wq);
3847 destroy_workqueue(nvme_reset_wq);
3849 destroy_workqueue(nvme_wq);
3854 void nvme_core_exit(void)
3856 ida_destroy(&nvme_subsystems_ida);
3857 class_destroy(nvme_subsys_class);
3858 class_destroy(nvme_class);
3859 unregister_chrdev_region(nvme_chr_devt, NVME_MINORS);
3860 destroy_workqueue(nvme_delete_wq);
3861 destroy_workqueue(nvme_reset_wq);
3862 destroy_workqueue(nvme_wq);
3865 MODULE_LICENSE("GPL");
3866 MODULE_VERSION("1.0");
3867 module_init(nvme_core_init);
3868 module_exit(nvme_core_exit);