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 int nvme_revalidate_disk(struct gendisk *disk);
101 static void nvme_put_subsystem(struct nvme_subsystem *subsys);
102 static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl,
105 static void nvme_set_queue_dying(struct nvme_ns *ns)
108 * Revalidating a dead namespace sets capacity to 0. This will end
109 * buffered writers dirtying pages that can't be synced.
111 if (!ns->disk || test_and_set_bit(NVME_NS_DEAD, &ns->flags))
113 revalidate_disk(ns->disk);
114 blk_set_queue_dying(ns->queue);
115 /* Forcibly unquiesce queues to avoid blocking dispatch */
116 blk_mq_unquiesce_queue(ns->queue);
119 static void nvme_queue_scan(struct nvme_ctrl *ctrl)
122 * Only new queue scan work when admin and IO queues are both alive
124 if (ctrl->state == NVME_CTRL_LIVE)
125 queue_work(nvme_wq, &ctrl->scan_work);
128 int nvme_reset_ctrl(struct nvme_ctrl *ctrl)
130 if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING))
132 if (!queue_work(nvme_reset_wq, &ctrl->reset_work))
136 EXPORT_SYMBOL_GPL(nvme_reset_ctrl);
138 int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl)
142 ret = nvme_reset_ctrl(ctrl);
144 flush_work(&ctrl->reset_work);
145 if (ctrl->state != NVME_CTRL_LIVE &&
146 ctrl->state != NVME_CTRL_ADMIN_ONLY)
152 EXPORT_SYMBOL_GPL(nvme_reset_ctrl_sync);
154 static void nvme_delete_ctrl_work(struct work_struct *work)
156 struct nvme_ctrl *ctrl =
157 container_of(work, struct nvme_ctrl, delete_work);
159 dev_info(ctrl->device,
160 "Removing ctrl: NQN \"%s\"\n", ctrl->opts->subsysnqn);
162 flush_work(&ctrl->reset_work);
163 nvme_stop_ctrl(ctrl);
164 nvme_remove_namespaces(ctrl);
165 ctrl->ops->delete_ctrl(ctrl);
166 nvme_uninit_ctrl(ctrl);
170 int nvme_delete_ctrl(struct nvme_ctrl *ctrl)
172 if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING))
174 if (!queue_work(nvme_delete_wq, &ctrl->delete_work))
178 EXPORT_SYMBOL_GPL(nvme_delete_ctrl);
180 int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl)
185 * Keep a reference until the work is flushed since ->delete_ctrl
186 * can free the controller.
189 ret = nvme_delete_ctrl(ctrl);
191 flush_work(&ctrl->delete_work);
195 EXPORT_SYMBOL_GPL(nvme_delete_ctrl_sync);
197 static inline bool nvme_ns_has_pi(struct nvme_ns *ns)
199 return ns->pi_type && ns->ms == sizeof(struct t10_pi_tuple);
202 static blk_status_t nvme_error_status(struct request *req)
204 switch (nvme_req(req)->status & 0x7ff) {
205 case NVME_SC_SUCCESS:
207 case NVME_SC_CAP_EXCEEDED:
208 return BLK_STS_NOSPC;
209 case NVME_SC_LBA_RANGE:
210 return BLK_STS_TARGET;
211 case NVME_SC_BAD_ATTRIBUTES:
212 case NVME_SC_ONCS_NOT_SUPPORTED:
213 case NVME_SC_INVALID_OPCODE:
214 case NVME_SC_INVALID_FIELD:
215 case NVME_SC_INVALID_NS:
216 return BLK_STS_NOTSUPP;
217 case NVME_SC_WRITE_FAULT:
218 case NVME_SC_READ_ERROR:
219 case NVME_SC_UNWRITTEN_BLOCK:
220 case NVME_SC_ACCESS_DENIED:
221 case NVME_SC_READ_ONLY:
222 case NVME_SC_COMPARE_FAILED:
223 return BLK_STS_MEDIUM;
224 case NVME_SC_GUARD_CHECK:
225 case NVME_SC_APPTAG_CHECK:
226 case NVME_SC_REFTAG_CHECK:
227 case NVME_SC_INVALID_PI:
228 return BLK_STS_PROTECTION;
229 case NVME_SC_RESERVATION_CONFLICT:
230 return BLK_STS_NEXUS;
232 return BLK_STS_IOERR;
236 static inline bool nvme_req_needs_retry(struct request *req)
238 if (blk_noretry_request(req))
240 if (nvme_req(req)->status & NVME_SC_DNR)
242 if (nvme_req(req)->retries >= nvme_max_retries)
247 static void nvme_retry_req(struct request *req)
249 struct nvme_ns *ns = req->q->queuedata;
250 unsigned long delay = 0;
253 /* The mask and shift result must be <= 3 */
254 crd = (nvme_req(req)->status & NVME_SC_CRD) >> 11;
256 delay = ns->ctrl->crdt[crd - 1] * 100;
258 nvme_req(req)->retries++;
259 blk_mq_requeue_request(req, false);
260 blk_mq_delay_kick_requeue_list(req->q, delay);
263 void nvme_complete_rq(struct request *req)
265 blk_status_t status = nvme_error_status(req);
267 trace_nvme_complete_rq(req);
269 if (nvme_req(req)->ctrl->kas)
270 nvme_req(req)->ctrl->comp_seen = true;
272 if (unlikely(status != BLK_STS_OK && nvme_req_needs_retry(req))) {
273 if ((req->cmd_flags & REQ_NVME_MPATH) &&
274 blk_path_error(status)) {
275 nvme_failover_req(req);
279 if (!blk_queue_dying(req->q)) {
284 blk_mq_end_request(req, status);
286 EXPORT_SYMBOL_GPL(nvme_complete_rq);
288 bool nvme_cancel_request(struct request *req, void *data, bool reserved)
290 dev_dbg_ratelimited(((struct nvme_ctrl *) data)->device,
291 "Cancelling I/O %d", req->tag);
293 nvme_req(req)->status = NVME_SC_ABORT_REQ;
294 blk_mq_complete_request(req);
297 EXPORT_SYMBOL_GPL(nvme_cancel_request);
299 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
300 enum nvme_ctrl_state new_state)
302 enum nvme_ctrl_state old_state;
304 bool changed = false;
306 spin_lock_irqsave(&ctrl->lock, flags);
308 old_state = ctrl->state;
310 case NVME_CTRL_ADMIN_ONLY:
312 case NVME_CTRL_CONNECTING:
322 case NVME_CTRL_RESETTING:
323 case NVME_CTRL_CONNECTING:
330 case NVME_CTRL_RESETTING:
334 case NVME_CTRL_ADMIN_ONLY:
341 case NVME_CTRL_CONNECTING:
344 case NVME_CTRL_RESETTING:
351 case NVME_CTRL_DELETING:
354 case NVME_CTRL_ADMIN_ONLY:
355 case NVME_CTRL_RESETTING:
356 case NVME_CTRL_CONNECTING:
365 case NVME_CTRL_DELETING:
377 ctrl->state = new_state;
379 spin_unlock_irqrestore(&ctrl->lock, flags);
380 if (changed && ctrl->state == NVME_CTRL_LIVE)
381 nvme_kick_requeue_lists(ctrl);
384 EXPORT_SYMBOL_GPL(nvme_change_ctrl_state);
386 static void nvme_free_ns_head(struct kref *ref)
388 struct nvme_ns_head *head =
389 container_of(ref, struct nvme_ns_head, ref);
391 nvme_mpath_remove_disk(head);
392 ida_simple_remove(&head->subsys->ns_ida, head->instance);
393 list_del_init(&head->entry);
394 cleanup_srcu_struct_quiesced(&head->srcu);
395 nvme_put_subsystem(head->subsys);
399 static void nvme_put_ns_head(struct nvme_ns_head *head)
401 kref_put(&head->ref, nvme_free_ns_head);
404 static void nvme_free_ns(struct kref *kref)
406 struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref);
409 nvme_nvm_unregister(ns);
412 nvme_put_ns_head(ns->head);
413 nvme_put_ctrl(ns->ctrl);
417 static void nvme_put_ns(struct nvme_ns *ns)
419 kref_put(&ns->kref, nvme_free_ns);
422 static inline void nvme_clear_nvme_request(struct request *req)
424 if (!(req->rq_flags & RQF_DONTPREP)) {
425 nvme_req(req)->retries = 0;
426 nvme_req(req)->flags = 0;
427 req->rq_flags |= RQF_DONTPREP;
431 struct request *nvme_alloc_request(struct request_queue *q,
432 struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid)
434 unsigned op = nvme_is_write(cmd) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN;
437 if (qid == NVME_QID_ANY) {
438 req = blk_mq_alloc_request(q, op, flags);
440 req = blk_mq_alloc_request_hctx(q, op, flags,
446 req->cmd_flags |= REQ_FAILFAST_DRIVER;
447 nvme_clear_nvme_request(req);
448 nvme_req(req)->cmd = cmd;
452 EXPORT_SYMBOL_GPL(nvme_alloc_request);
454 static int nvme_toggle_streams(struct nvme_ctrl *ctrl, bool enable)
456 struct nvme_command c;
458 memset(&c, 0, sizeof(c));
460 c.directive.opcode = nvme_admin_directive_send;
461 c.directive.nsid = cpu_to_le32(NVME_NSID_ALL);
462 c.directive.doper = NVME_DIR_SND_ID_OP_ENABLE;
463 c.directive.dtype = NVME_DIR_IDENTIFY;
464 c.directive.tdtype = NVME_DIR_STREAMS;
465 c.directive.endir = enable ? NVME_DIR_ENDIR : 0;
467 return nvme_submit_sync_cmd(ctrl->admin_q, &c, NULL, 0);
470 static int nvme_disable_streams(struct nvme_ctrl *ctrl)
472 return nvme_toggle_streams(ctrl, false);
475 static int nvme_enable_streams(struct nvme_ctrl *ctrl)
477 return nvme_toggle_streams(ctrl, true);
480 static int nvme_get_stream_params(struct nvme_ctrl *ctrl,
481 struct streams_directive_params *s, u32 nsid)
483 struct nvme_command c;
485 memset(&c, 0, sizeof(c));
486 memset(s, 0, sizeof(*s));
488 c.directive.opcode = nvme_admin_directive_recv;
489 c.directive.nsid = cpu_to_le32(nsid);
490 c.directive.numd = cpu_to_le32((sizeof(*s) >> 2) - 1);
491 c.directive.doper = NVME_DIR_RCV_ST_OP_PARAM;
492 c.directive.dtype = NVME_DIR_STREAMS;
494 return nvme_submit_sync_cmd(ctrl->admin_q, &c, s, sizeof(*s));
497 static int nvme_configure_directives(struct nvme_ctrl *ctrl)
499 struct streams_directive_params s;
502 if (!(ctrl->oacs & NVME_CTRL_OACS_DIRECTIVES))
507 ret = nvme_enable_streams(ctrl);
511 ret = nvme_get_stream_params(ctrl, &s, NVME_NSID_ALL);
515 ctrl->nssa = le16_to_cpu(s.nssa);
516 if (ctrl->nssa < BLK_MAX_WRITE_HINTS - 1) {
517 dev_info(ctrl->device, "too few streams (%u) available\n",
519 nvme_disable_streams(ctrl);
523 ctrl->nr_streams = min_t(unsigned, ctrl->nssa, BLK_MAX_WRITE_HINTS - 1);
524 dev_info(ctrl->device, "Using %u streams\n", ctrl->nr_streams);
529 * Check if 'req' has a write hint associated with it. If it does, assign
530 * a valid namespace stream to the write.
532 static void nvme_assign_write_stream(struct nvme_ctrl *ctrl,
533 struct request *req, u16 *control,
536 enum rw_hint streamid = req->write_hint;
538 if (streamid == WRITE_LIFE_NOT_SET || streamid == WRITE_LIFE_NONE)
542 if (WARN_ON_ONCE(streamid > ctrl->nr_streams))
545 *control |= NVME_RW_DTYPE_STREAMS;
546 *dsmgmt |= streamid << 16;
549 if (streamid < ARRAY_SIZE(req->q->write_hints))
550 req->q->write_hints[streamid] += blk_rq_bytes(req) >> 9;
553 static inline void nvme_setup_flush(struct nvme_ns *ns,
554 struct nvme_command *cmnd)
556 cmnd->common.opcode = nvme_cmd_flush;
557 cmnd->common.nsid = cpu_to_le32(ns->head->ns_id);
560 static blk_status_t nvme_setup_discard(struct nvme_ns *ns, struct request *req,
561 struct nvme_command *cmnd)
563 unsigned short segments = blk_rq_nr_discard_segments(req), n = 0;
564 struct nvme_dsm_range *range;
567 range = kmalloc_array(segments, sizeof(*range),
568 GFP_ATOMIC | __GFP_NOWARN);
571 * If we fail allocation our range, fallback to the controller
572 * discard page. If that's also busy, it's safe to return
573 * busy, as we know we can make progress once that's freed.
575 if (test_and_set_bit_lock(0, &ns->ctrl->discard_page_busy))
576 return BLK_STS_RESOURCE;
578 range = page_address(ns->ctrl->discard_page);
581 __rq_for_each_bio(bio, req) {
582 u64 slba = nvme_block_nr(ns, bio->bi_iter.bi_sector);
583 u32 nlb = bio->bi_iter.bi_size >> ns->lba_shift;
586 range[n].cattr = cpu_to_le32(0);
587 range[n].nlb = cpu_to_le32(nlb);
588 range[n].slba = cpu_to_le64(slba);
593 if (WARN_ON_ONCE(n != segments)) {
594 if (virt_to_page(range) == ns->ctrl->discard_page)
595 clear_bit_unlock(0, &ns->ctrl->discard_page_busy);
598 return BLK_STS_IOERR;
601 cmnd->dsm.opcode = nvme_cmd_dsm;
602 cmnd->dsm.nsid = cpu_to_le32(ns->head->ns_id);
603 cmnd->dsm.nr = cpu_to_le32(segments - 1);
604 cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
606 req->special_vec.bv_page = virt_to_page(range);
607 req->special_vec.bv_offset = offset_in_page(range);
608 req->special_vec.bv_len = sizeof(*range) * segments;
609 req->rq_flags |= RQF_SPECIAL_PAYLOAD;
614 static inline blk_status_t nvme_setup_rw(struct nvme_ns *ns,
615 struct request *req, struct nvme_command *cmnd)
617 struct nvme_ctrl *ctrl = ns->ctrl;
621 if (req->cmd_flags & REQ_FUA)
622 control |= NVME_RW_FUA;
623 if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD))
624 control |= NVME_RW_LR;
626 if (req->cmd_flags & REQ_RAHEAD)
627 dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;
629 cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read);
630 cmnd->rw.nsid = cpu_to_le32(ns->head->ns_id);
631 cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
632 cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
634 if (req_op(req) == REQ_OP_WRITE && ctrl->nr_streams)
635 nvme_assign_write_stream(ctrl, req, &control, &dsmgmt);
639 * If formated with metadata, the block layer always provides a
640 * metadata buffer if CONFIG_BLK_DEV_INTEGRITY is enabled. Else
641 * we enable the PRACT bit for protection information or set the
642 * namespace capacity to zero to prevent any I/O.
644 if (!blk_integrity_rq(req)) {
645 if (WARN_ON_ONCE(!nvme_ns_has_pi(ns)))
646 return BLK_STS_NOTSUPP;
647 control |= NVME_RW_PRINFO_PRACT;
648 } else if (req_op(req) == REQ_OP_WRITE) {
649 t10_pi_prepare(req, ns->pi_type);
652 switch (ns->pi_type) {
653 case NVME_NS_DPS_PI_TYPE3:
654 control |= NVME_RW_PRINFO_PRCHK_GUARD;
656 case NVME_NS_DPS_PI_TYPE1:
657 case NVME_NS_DPS_PI_TYPE2:
658 control |= NVME_RW_PRINFO_PRCHK_GUARD |
659 NVME_RW_PRINFO_PRCHK_REF;
660 cmnd->rw.reftag = cpu_to_le32(t10_pi_ref_tag(req));
665 cmnd->rw.control = cpu_to_le16(control);
666 cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
670 void nvme_cleanup_cmd(struct request *req)
672 if (blk_integrity_rq(req) && req_op(req) == REQ_OP_READ &&
673 nvme_req(req)->status == 0) {
674 struct nvme_ns *ns = req->rq_disk->private_data;
676 t10_pi_complete(req, ns->pi_type,
677 blk_rq_bytes(req) >> ns->lba_shift);
679 if (req->rq_flags & RQF_SPECIAL_PAYLOAD) {
680 struct nvme_ns *ns = req->rq_disk->private_data;
681 struct page *page = req->special_vec.bv_page;
683 if (page == ns->ctrl->discard_page)
684 clear_bit_unlock(0, &ns->ctrl->discard_page_busy);
686 kfree(page_address(page) + req->special_vec.bv_offset);
689 EXPORT_SYMBOL_GPL(nvme_cleanup_cmd);
691 blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
692 struct nvme_command *cmd)
694 blk_status_t ret = BLK_STS_OK;
696 nvme_clear_nvme_request(req);
698 memset(cmd, 0, sizeof(*cmd));
699 switch (req_op(req)) {
702 memcpy(cmd, nvme_req(req)->cmd, sizeof(*cmd));
705 nvme_setup_flush(ns, cmd);
707 case REQ_OP_WRITE_ZEROES:
708 /* currently only aliased to deallocate for a few ctrls: */
710 ret = nvme_setup_discard(ns, req, cmd);
714 ret = nvme_setup_rw(ns, req, cmd);
718 return BLK_STS_IOERR;
721 cmd->common.command_id = req->tag;
722 trace_nvme_setup_cmd(req, cmd);
725 EXPORT_SYMBOL_GPL(nvme_setup_cmd);
727 static void nvme_end_sync_rq(struct request *rq, blk_status_t error)
729 struct completion *waiting = rq->end_io_data;
731 rq->end_io_data = NULL;
735 static void nvme_execute_rq_polled(struct request_queue *q,
736 struct gendisk *bd_disk, struct request *rq, int at_head)
738 DECLARE_COMPLETION_ONSTACK(wait);
740 WARN_ON_ONCE(!test_bit(QUEUE_FLAG_POLL, &q->queue_flags));
742 rq->cmd_flags |= REQ_HIPRI;
743 rq->end_io_data = &wait;
744 blk_execute_rq_nowait(q, bd_disk, rq, at_head, nvme_end_sync_rq);
746 while (!completion_done(&wait)) {
747 blk_poll(q, request_to_qc_t(rq->mq_hctx, rq), true);
753 * Returns 0 on success. If the result is negative, it's a Linux error code;
754 * if the result is positive, it's an NVM Express status code
756 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
757 union nvme_result *result, void *buffer, unsigned bufflen,
758 unsigned timeout, int qid, int at_head,
759 blk_mq_req_flags_t flags, bool poll)
764 req = nvme_alloc_request(q, cmd, flags, qid);
768 req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
770 if (buffer && bufflen) {
771 ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL);
777 nvme_execute_rq_polled(req->q, NULL, req, at_head);
779 blk_execute_rq(req->q, NULL, req, at_head);
781 *result = nvme_req(req)->result;
782 if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
785 ret = nvme_req(req)->status;
787 blk_mq_free_request(req);
790 EXPORT_SYMBOL_GPL(__nvme_submit_sync_cmd);
792 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
793 void *buffer, unsigned bufflen)
795 return __nvme_submit_sync_cmd(q, cmd, NULL, buffer, bufflen, 0,
796 NVME_QID_ANY, 0, 0, false);
798 EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd);
800 static void *nvme_add_user_metadata(struct bio *bio, void __user *ubuf,
801 unsigned len, u32 seed, bool write)
803 struct bio_integrity_payload *bip;
807 buf = kmalloc(len, GFP_KERNEL);
812 if (write && copy_from_user(buf, ubuf, len))
815 bip = bio_integrity_alloc(bio, GFP_KERNEL, 1);
821 bip->bip_iter.bi_size = len;
822 bip->bip_iter.bi_sector = seed;
823 ret = bio_integrity_add_page(bio, virt_to_page(buf), len,
824 offset_in_page(buf));
834 static int nvme_submit_user_cmd(struct request_queue *q,
835 struct nvme_command *cmd, void __user *ubuffer,
836 unsigned bufflen, void __user *meta_buffer, unsigned meta_len,
837 u32 meta_seed, u32 *result, unsigned timeout)
839 bool write = nvme_is_write(cmd);
840 struct nvme_ns *ns = q->queuedata;
841 struct gendisk *disk = ns ? ns->disk : NULL;
843 struct bio *bio = NULL;
847 req = nvme_alloc_request(q, cmd, 0, NVME_QID_ANY);
851 req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
852 nvme_req(req)->flags |= NVME_REQ_USERCMD;
854 if (ubuffer && bufflen) {
855 ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
861 if (disk && meta_buffer && meta_len) {
862 meta = nvme_add_user_metadata(bio, meta_buffer, meta_len,
868 req->cmd_flags |= REQ_INTEGRITY;
872 blk_execute_rq(req->q, disk, req, 0);
873 if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
876 ret = nvme_req(req)->status;
878 *result = le32_to_cpu(nvme_req(req)->result.u32);
879 if (meta && !ret && !write) {
880 if (copy_to_user(meta_buffer, meta, meta_len))
886 blk_rq_unmap_user(bio);
888 blk_mq_free_request(req);
892 static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status)
894 struct nvme_ctrl *ctrl = rq->end_io_data;
896 bool startka = false;
898 blk_mq_free_request(rq);
901 dev_err(ctrl->device,
902 "failed nvme_keep_alive_end_io error=%d\n",
907 ctrl->comp_seen = false;
908 spin_lock_irqsave(&ctrl->lock, flags);
909 if (ctrl->state == NVME_CTRL_LIVE ||
910 ctrl->state == NVME_CTRL_CONNECTING)
912 spin_unlock_irqrestore(&ctrl->lock, flags);
914 schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
917 static int nvme_keep_alive(struct nvme_ctrl *ctrl)
921 rq = nvme_alloc_request(ctrl->admin_q, &ctrl->ka_cmd, BLK_MQ_REQ_RESERVED,
926 rq->timeout = ctrl->kato * HZ;
927 rq->end_io_data = ctrl;
929 blk_execute_rq_nowait(rq->q, NULL, rq, 0, nvme_keep_alive_end_io);
934 static void nvme_keep_alive_work(struct work_struct *work)
936 struct nvme_ctrl *ctrl = container_of(to_delayed_work(work),
937 struct nvme_ctrl, ka_work);
938 bool comp_seen = ctrl->comp_seen;
940 if ((ctrl->ctratt & NVME_CTRL_ATTR_TBKAS) && comp_seen) {
941 dev_dbg(ctrl->device,
942 "reschedule traffic based keep-alive timer\n");
943 ctrl->comp_seen = false;
944 schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
948 if (nvme_keep_alive(ctrl)) {
949 /* allocation failure, reset the controller */
950 dev_err(ctrl->device, "keep-alive failed\n");
951 nvme_reset_ctrl(ctrl);
956 static void nvme_start_keep_alive(struct nvme_ctrl *ctrl)
958 if (unlikely(ctrl->kato == 0))
961 schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
964 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl)
966 if (unlikely(ctrl->kato == 0))
969 cancel_delayed_work_sync(&ctrl->ka_work);
971 EXPORT_SYMBOL_GPL(nvme_stop_keep_alive);
973 static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
975 struct nvme_command c = { };
978 /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
979 c.identify.opcode = nvme_admin_identify;
980 c.identify.cns = NVME_ID_CNS_CTRL;
982 *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL);
986 error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
987 sizeof(struct nvme_id_ctrl));
993 static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
994 struct nvme_ns_ids *ids)
996 struct nvme_command c = { };
1002 c.identify.opcode = nvme_admin_identify;
1003 c.identify.nsid = cpu_to_le32(nsid);
1004 c.identify.cns = NVME_ID_CNS_NS_DESC_LIST;
1006 data = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL);
1010 status = nvme_submit_sync_cmd(ctrl->admin_q, &c, data,
1011 NVME_IDENTIFY_DATA_SIZE);
1015 for (pos = 0; pos < NVME_IDENTIFY_DATA_SIZE; pos += len) {
1016 struct nvme_ns_id_desc *cur = data + pos;
1021 switch (cur->nidt) {
1022 case NVME_NIDT_EUI64:
1023 if (cur->nidl != NVME_NIDT_EUI64_LEN) {
1024 dev_warn(ctrl->device,
1025 "ctrl returned bogus length: %d for NVME_NIDT_EUI64\n",
1029 len = NVME_NIDT_EUI64_LEN;
1030 memcpy(ids->eui64, data + pos + sizeof(*cur), len);
1032 case NVME_NIDT_NGUID:
1033 if (cur->nidl != NVME_NIDT_NGUID_LEN) {
1034 dev_warn(ctrl->device,
1035 "ctrl returned bogus length: %d for NVME_NIDT_NGUID\n",
1039 len = NVME_NIDT_NGUID_LEN;
1040 memcpy(ids->nguid, data + pos + sizeof(*cur), len);
1042 case NVME_NIDT_UUID:
1043 if (cur->nidl != NVME_NIDT_UUID_LEN) {
1044 dev_warn(ctrl->device,
1045 "ctrl returned bogus length: %d for NVME_NIDT_UUID\n",
1049 len = NVME_NIDT_UUID_LEN;
1050 uuid_copy(&ids->uuid, data + pos + sizeof(*cur));
1053 /* Skip unknown types */
1058 len += sizeof(*cur);
1065 static int nvme_identify_ns_list(struct nvme_ctrl *dev, unsigned nsid, __le32 *ns_list)
1067 struct nvme_command c = { };
1069 c.identify.opcode = nvme_admin_identify;
1070 c.identify.cns = NVME_ID_CNS_NS_ACTIVE_LIST;
1071 c.identify.nsid = cpu_to_le32(nsid);
1072 return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list,
1073 NVME_IDENTIFY_DATA_SIZE);
1076 static struct nvme_id_ns *nvme_identify_ns(struct nvme_ctrl *ctrl,
1079 struct nvme_id_ns *id;
1080 struct nvme_command c = { };
1083 /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
1084 c.identify.opcode = nvme_admin_identify;
1085 c.identify.nsid = cpu_to_le32(nsid);
1086 c.identify.cns = NVME_ID_CNS_NS;
1088 id = kmalloc(sizeof(*id), GFP_KERNEL);
1092 error = nvme_submit_sync_cmd(ctrl->admin_q, &c, id, sizeof(*id));
1094 dev_warn(ctrl->device, "Identify namespace failed\n");
1102 static int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
1103 void *buffer, size_t buflen, u32 *result)
1105 struct nvme_command c;
1106 union nvme_result res;
1109 memset(&c, 0, sizeof(c));
1110 c.features.opcode = nvme_admin_set_features;
1111 c.features.fid = cpu_to_le32(fid);
1112 c.features.dword11 = cpu_to_le32(dword11);
1114 ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &res,
1115 buffer, buflen, 0, NVME_QID_ANY, 0, 0, false);
1116 if (ret >= 0 && result)
1117 *result = le32_to_cpu(res.u32);
1121 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count)
1123 u32 q_count = (*count - 1) | ((*count - 1) << 16);
1125 int status, nr_io_queues;
1127 status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, NULL, 0,
1133 * Degraded controllers might return an error when setting the queue
1134 * count. We still want to be able to bring them online and offer
1135 * access to the admin queue, as that might be only way to fix them up.
1138 dev_err(ctrl->device, "Could not set queue count (%d)\n", status);
1141 nr_io_queues = min(result & 0xffff, result >> 16) + 1;
1142 *count = min(*count, nr_io_queues);
1147 EXPORT_SYMBOL_GPL(nvme_set_queue_count);
1149 #define NVME_AEN_SUPPORTED \
1150 (NVME_AEN_CFG_NS_ATTR | NVME_AEN_CFG_FW_ACT | NVME_AEN_CFG_ANA_CHANGE)
1152 static void nvme_enable_aen(struct nvme_ctrl *ctrl)
1154 u32 result, supported_aens = ctrl->oaes & NVME_AEN_SUPPORTED;
1157 if (!supported_aens)
1160 status = nvme_set_features(ctrl, NVME_FEAT_ASYNC_EVENT, supported_aens,
1163 dev_warn(ctrl->device, "Failed to configure AEN (cfg %x)\n",
1167 static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
1169 struct nvme_user_io io;
1170 struct nvme_command c;
1171 unsigned length, meta_len;
1172 void __user *metadata;
1174 if (copy_from_user(&io, uio, sizeof(io)))
1179 switch (io.opcode) {
1180 case nvme_cmd_write:
1182 case nvme_cmd_compare:
1188 length = (io.nblocks + 1) << ns->lba_shift;
1189 meta_len = (io.nblocks + 1) * ns->ms;
1190 metadata = (void __user *)(uintptr_t)io.metadata;
1195 } else if (meta_len) {
1196 if ((io.metadata & 3) || !io.metadata)
1200 memset(&c, 0, sizeof(c));
1201 c.rw.opcode = io.opcode;
1202 c.rw.flags = io.flags;
1203 c.rw.nsid = cpu_to_le32(ns->head->ns_id);
1204 c.rw.slba = cpu_to_le64(io.slba);
1205 c.rw.length = cpu_to_le16(io.nblocks);
1206 c.rw.control = cpu_to_le16(io.control);
1207 c.rw.dsmgmt = cpu_to_le32(io.dsmgmt);
1208 c.rw.reftag = cpu_to_le32(io.reftag);
1209 c.rw.apptag = cpu_to_le16(io.apptag);
1210 c.rw.appmask = cpu_to_le16(io.appmask);
1212 return nvme_submit_user_cmd(ns->queue, &c,
1213 (void __user *)(uintptr_t)io.addr, length,
1214 metadata, meta_len, lower_32_bits(io.slba), NULL, 0);
1217 static u32 nvme_known_admin_effects(u8 opcode)
1220 case nvme_admin_format_nvm:
1221 return NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC |
1222 NVME_CMD_EFFECTS_CSE_MASK;
1223 case nvme_admin_sanitize_nvm:
1224 return NVME_CMD_EFFECTS_CSE_MASK;
1231 static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
1238 effects = le32_to_cpu(ctrl->effects->iocs[opcode]);
1239 if (effects & ~NVME_CMD_EFFECTS_CSUPP)
1240 dev_warn(ctrl->device,
1241 "IO command:%02x has unhandled effects:%08x\n",
1247 effects = le32_to_cpu(ctrl->effects->acs[opcode]);
1249 effects = nvme_known_admin_effects(opcode);
1252 * For simplicity, IO to all namespaces is quiesced even if the command
1253 * effects say only one namespace is affected.
1255 if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) {
1256 mutex_lock(&ctrl->scan_lock);
1257 nvme_start_freeze(ctrl);
1258 nvme_wait_freeze(ctrl);
1263 static void nvme_update_formats(struct nvme_ctrl *ctrl)
1267 down_read(&ctrl->namespaces_rwsem);
1268 list_for_each_entry(ns, &ctrl->namespaces, list)
1269 if (ns->disk && nvme_revalidate_disk(ns->disk))
1270 nvme_set_queue_dying(ns);
1271 up_read(&ctrl->namespaces_rwsem);
1273 nvme_remove_invalid_namespaces(ctrl, NVME_NSID_ALL);
1276 static void nvme_passthru_end(struct nvme_ctrl *ctrl, u32 effects)
1279 * Revalidate LBA changes prior to unfreezing. This is necessary to
1280 * prevent memory corruption if a logical block size was changed by
1283 if (effects & NVME_CMD_EFFECTS_LBCC)
1284 nvme_update_formats(ctrl);
1285 if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) {
1286 nvme_unfreeze(ctrl);
1287 mutex_unlock(&ctrl->scan_lock);
1289 if (effects & NVME_CMD_EFFECTS_CCC)
1290 nvme_init_identify(ctrl);
1291 if (effects & (NVME_CMD_EFFECTS_NIC | NVME_CMD_EFFECTS_NCC))
1292 nvme_queue_scan(ctrl);
1295 static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
1296 struct nvme_passthru_cmd __user *ucmd)
1298 struct nvme_passthru_cmd cmd;
1299 struct nvme_command c;
1300 unsigned timeout = 0;
1304 if (!capable(CAP_SYS_ADMIN))
1306 if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
1311 memset(&c, 0, sizeof(c));
1312 c.common.opcode = cmd.opcode;
1313 c.common.flags = cmd.flags;
1314 c.common.nsid = cpu_to_le32(cmd.nsid);
1315 c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
1316 c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
1317 c.common.cdw10 = cpu_to_le32(cmd.cdw10);
1318 c.common.cdw11 = cpu_to_le32(cmd.cdw11);
1319 c.common.cdw12 = cpu_to_le32(cmd.cdw12);
1320 c.common.cdw13 = cpu_to_le32(cmd.cdw13);
1321 c.common.cdw14 = cpu_to_le32(cmd.cdw14);
1322 c.common.cdw15 = cpu_to_le32(cmd.cdw15);
1325 timeout = msecs_to_jiffies(cmd.timeout_ms);
1327 effects = nvme_passthru_start(ctrl, ns, cmd.opcode);
1328 status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
1329 (void __user *)(uintptr_t)cmd.addr, cmd.data_len,
1330 (void __user *)(uintptr_t)cmd.metadata, cmd.metadata_len,
1331 0, &cmd.result, timeout);
1332 nvme_passthru_end(ctrl, effects);
1335 if (put_user(cmd.result, &ucmd->result))
1343 * Issue ioctl requests on the first available path. Note that unlike normal
1344 * block layer requests we will not retry failed request on another controller.
1346 static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk,
1347 struct nvme_ns_head **head, int *srcu_idx)
1349 #ifdef CONFIG_NVME_MULTIPATH
1350 if (disk->fops == &nvme_ns_head_ops) {
1351 *head = disk->private_data;
1352 *srcu_idx = srcu_read_lock(&(*head)->srcu);
1353 return nvme_find_path(*head);
1358 return disk->private_data;
1361 static void nvme_put_ns_from_disk(struct nvme_ns_head *head, int idx)
1364 srcu_read_unlock(&head->srcu, idx);
1367 static int nvme_ns_ioctl(struct nvme_ns *ns, unsigned cmd, unsigned long arg)
1371 force_successful_syscall_return();
1372 return ns->head->ns_id;
1373 case NVME_IOCTL_ADMIN_CMD:
1374 return nvme_user_cmd(ns->ctrl, NULL, (void __user *)arg);
1375 case NVME_IOCTL_IO_CMD:
1376 return nvme_user_cmd(ns->ctrl, ns, (void __user *)arg);
1377 case NVME_IOCTL_SUBMIT_IO:
1378 return nvme_submit_io(ns, (void __user *)arg);
1382 return nvme_nvm_ioctl(ns, cmd, arg);
1384 if (is_sed_ioctl(cmd))
1385 return sed_ioctl(ns->ctrl->opal_dev, cmd,
1386 (void __user *) arg);
1391 static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
1392 unsigned int cmd, unsigned long arg)
1394 struct nvme_ns_head *head = NULL;
1398 ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx);
1402 ret = nvme_ns_ioctl(ns, cmd, arg);
1403 nvme_put_ns_from_disk(head, srcu_idx);
1407 static int nvme_open(struct block_device *bdev, fmode_t mode)
1409 struct nvme_ns *ns = bdev->bd_disk->private_data;
1411 #ifdef CONFIG_NVME_MULTIPATH
1412 /* should never be called due to GENHD_FL_HIDDEN */
1413 if (WARN_ON_ONCE(ns->head->disk))
1416 if (!kref_get_unless_zero(&ns->kref))
1418 if (!try_module_get(ns->ctrl->ops->module))
1429 static void nvme_release(struct gendisk *disk, fmode_t mode)
1431 struct nvme_ns *ns = disk->private_data;
1433 module_put(ns->ctrl->ops->module);
1437 static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1439 /* some standard values */
1440 geo->heads = 1 << 6;
1441 geo->sectors = 1 << 5;
1442 geo->cylinders = get_capacity(bdev->bd_disk) >> 11;
1446 #ifdef CONFIG_BLK_DEV_INTEGRITY
1447 static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type)
1449 struct blk_integrity integrity;
1451 memset(&integrity, 0, sizeof(integrity));
1453 case NVME_NS_DPS_PI_TYPE3:
1454 integrity.profile = &t10_pi_type3_crc;
1455 integrity.tag_size = sizeof(u16) + sizeof(u32);
1456 integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
1458 case NVME_NS_DPS_PI_TYPE1:
1459 case NVME_NS_DPS_PI_TYPE2:
1460 integrity.profile = &t10_pi_type1_crc;
1461 integrity.tag_size = sizeof(u16);
1462 integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
1465 integrity.profile = NULL;
1468 integrity.tuple_size = ms;
1469 blk_integrity_register(disk, &integrity);
1470 blk_queue_max_integrity_segments(disk->queue, 1);
1473 static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type)
1476 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1478 static void nvme_set_chunk_size(struct nvme_ns *ns)
1480 u32 chunk_size = (((u32)ns->noiob) << (ns->lba_shift - 9));
1481 blk_queue_chunk_sectors(ns->queue, rounddown_pow_of_two(chunk_size));
1484 static void nvme_config_discard(struct nvme_ns *ns)
1486 struct nvme_ctrl *ctrl = ns->ctrl;
1487 struct request_queue *queue = ns->queue;
1488 u32 size = queue_logical_block_size(queue);
1490 if (!(ctrl->oncs & NVME_CTRL_ONCS_DSM)) {
1491 blk_queue_flag_clear(QUEUE_FLAG_DISCARD, queue);
1495 if (ctrl->nr_streams && ns->sws && ns->sgs)
1496 size *= ns->sws * ns->sgs;
1498 BUILD_BUG_ON(PAGE_SIZE / sizeof(struct nvme_dsm_range) <
1499 NVME_DSM_MAX_RANGES);
1501 queue->limits.discard_alignment = 0;
1502 queue->limits.discard_granularity = size;
1504 /* If discard is already enabled, don't reset queue limits */
1505 if (blk_queue_flag_test_and_set(QUEUE_FLAG_DISCARD, queue))
1508 blk_queue_max_discard_sectors(queue, UINT_MAX);
1509 blk_queue_max_discard_segments(queue, NVME_DSM_MAX_RANGES);
1511 if (ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
1512 blk_queue_max_write_zeroes_sectors(queue, UINT_MAX);
1515 static void nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid,
1516 struct nvme_id_ns *id, struct nvme_ns_ids *ids)
1518 memset(ids, 0, sizeof(*ids));
1520 if (ctrl->vs >= NVME_VS(1, 1, 0))
1521 memcpy(ids->eui64, id->eui64, sizeof(id->eui64));
1522 if (ctrl->vs >= NVME_VS(1, 2, 0))
1523 memcpy(ids->nguid, id->nguid, sizeof(id->nguid));
1524 if (ctrl->vs >= NVME_VS(1, 3, 0)) {
1525 /* Don't treat error as fatal we potentially
1526 * already have a NGUID or EUI-64
1528 if (nvme_identify_ns_descs(ctrl, nsid, ids))
1529 dev_warn(ctrl->device,
1530 "%s: Identify Descriptors failed\n", __func__);
1534 static bool nvme_ns_ids_valid(struct nvme_ns_ids *ids)
1536 return !uuid_is_null(&ids->uuid) ||
1537 memchr_inv(ids->nguid, 0, sizeof(ids->nguid)) ||
1538 memchr_inv(ids->eui64, 0, sizeof(ids->eui64));
1541 static bool nvme_ns_ids_equal(struct nvme_ns_ids *a, struct nvme_ns_ids *b)
1543 return uuid_equal(&a->uuid, &b->uuid) &&
1544 memcmp(&a->nguid, &b->nguid, sizeof(a->nguid)) == 0 &&
1545 memcmp(&a->eui64, &b->eui64, sizeof(a->eui64)) == 0;
1548 static void nvme_update_disk_info(struct gendisk *disk,
1549 struct nvme_ns *ns, struct nvme_id_ns *id)
1551 sector_t capacity = le64_to_cpup(&id->nsze) << (ns->lba_shift - 9);
1552 unsigned short bs = 1 << ns->lba_shift;
1554 blk_mq_freeze_queue(disk->queue);
1555 blk_integrity_unregister(disk);
1557 blk_queue_logical_block_size(disk->queue, bs);
1558 blk_queue_physical_block_size(disk->queue, bs);
1559 blk_queue_io_min(disk->queue, bs);
1561 if (ns->ms && !ns->ext &&
1562 (ns->ctrl->ops->flags & NVME_F_METADATA_SUPPORTED))
1563 nvme_init_integrity(disk, ns->ms, ns->pi_type);
1564 if (ns->ms && !nvme_ns_has_pi(ns) && !blk_get_integrity(disk))
1567 set_capacity(disk, capacity);
1568 nvme_config_discard(ns);
1570 if (id->nsattr & (1 << 0))
1571 set_disk_ro(disk, true);
1573 set_disk_ro(disk, false);
1575 blk_mq_unfreeze_queue(disk->queue);
1578 static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
1580 struct nvme_ns *ns = disk->private_data;
1583 * If identify namespace failed, use default 512 byte block size so
1584 * block layer can use before failing read/write for 0 capacity.
1586 ns->lba_shift = id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ds;
1587 if (ns->lba_shift == 0)
1589 ns->noiob = le16_to_cpu(id->noiob);
1590 ns->ms = le16_to_cpu(id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ms);
1591 ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT);
1592 /* the PI implementation requires metadata equal t10 pi tuple size */
1593 if (ns->ms == sizeof(struct t10_pi_tuple))
1594 ns->pi_type = id->dps & NVME_NS_DPS_PI_MASK;
1599 nvme_set_chunk_size(ns);
1600 nvme_update_disk_info(disk, ns, id);
1601 #ifdef CONFIG_NVME_MULTIPATH
1602 if (ns->head->disk) {
1603 nvme_update_disk_info(ns->head->disk, ns, id);
1604 blk_queue_stack_limits(ns->head->disk->queue, ns->queue);
1609 static int nvme_revalidate_disk(struct gendisk *disk)
1611 struct nvme_ns *ns = disk->private_data;
1612 struct nvme_ctrl *ctrl = ns->ctrl;
1613 struct nvme_id_ns *id;
1614 struct nvme_ns_ids ids;
1617 if (test_bit(NVME_NS_DEAD, &ns->flags)) {
1618 set_capacity(disk, 0);
1622 id = nvme_identify_ns(ctrl, ns->head->ns_id);
1626 if (id->ncap == 0) {
1631 __nvme_revalidate_disk(disk, id);
1632 nvme_report_ns_ids(ctrl, ns->head->ns_id, id, &ids);
1633 if (!nvme_ns_ids_equal(&ns->head->ids, &ids)) {
1634 dev_err(ctrl->device,
1635 "identifiers changed for nsid %d\n", ns->head->ns_id);
1644 static char nvme_pr_type(enum pr_type type)
1647 case PR_WRITE_EXCLUSIVE:
1649 case PR_EXCLUSIVE_ACCESS:
1651 case PR_WRITE_EXCLUSIVE_REG_ONLY:
1653 case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1655 case PR_WRITE_EXCLUSIVE_ALL_REGS:
1657 case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1664 static int nvme_pr_command(struct block_device *bdev, u32 cdw10,
1665 u64 key, u64 sa_key, u8 op)
1667 struct nvme_ns_head *head = NULL;
1669 struct nvme_command c;
1671 u8 data[16] = { 0, };
1673 ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx);
1675 return -EWOULDBLOCK;
1677 put_unaligned_le64(key, &data[0]);
1678 put_unaligned_le64(sa_key, &data[8]);
1680 memset(&c, 0, sizeof(c));
1681 c.common.opcode = op;
1682 c.common.nsid = cpu_to_le32(ns->head->ns_id);
1683 c.common.cdw10 = cpu_to_le32(cdw10);
1685 ret = nvme_submit_sync_cmd(ns->queue, &c, data, 16);
1686 nvme_put_ns_from_disk(head, srcu_idx);
1690 static int nvme_pr_register(struct block_device *bdev, u64 old,
1691 u64 new, unsigned flags)
1695 if (flags & ~PR_FL_IGNORE_KEY)
1698 cdw10 = old ? 2 : 0;
1699 cdw10 |= (flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0;
1700 cdw10 |= (1 << 30) | (1 << 31); /* PTPL=1 */
1701 return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_register);
1704 static int nvme_pr_reserve(struct block_device *bdev, u64 key,
1705 enum pr_type type, unsigned flags)
1709 if (flags & ~PR_FL_IGNORE_KEY)
1712 cdw10 = nvme_pr_type(type) << 8;
1713 cdw10 |= ((flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0);
1714 return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_acquire);
1717 static int nvme_pr_preempt(struct block_device *bdev, u64 old, u64 new,
1718 enum pr_type type, bool abort)
1720 u32 cdw10 = nvme_pr_type(type) << 8 | (abort ? 2 : 1);
1721 return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_acquire);
1724 static int nvme_pr_clear(struct block_device *bdev, u64 key)
1726 u32 cdw10 = 1 | (key ? 1 << 3 : 0);
1727 return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_register);
1730 static int nvme_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1732 u32 cdw10 = nvme_pr_type(type) << 8 | (key ? 1 << 3 : 0);
1733 return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_release);
1736 static const struct pr_ops nvme_pr_ops = {
1737 .pr_register = nvme_pr_register,
1738 .pr_reserve = nvme_pr_reserve,
1739 .pr_release = nvme_pr_release,
1740 .pr_preempt = nvme_pr_preempt,
1741 .pr_clear = nvme_pr_clear,
1744 #ifdef CONFIG_BLK_SED_OPAL
1745 int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
1748 struct nvme_ctrl *ctrl = data;
1749 struct nvme_command cmd;
1751 memset(&cmd, 0, sizeof(cmd));
1753 cmd.common.opcode = nvme_admin_security_send;
1755 cmd.common.opcode = nvme_admin_security_recv;
1756 cmd.common.nsid = 0;
1757 cmd.common.cdw10 = cpu_to_le32(((u32)secp) << 24 | ((u32)spsp) << 8);
1758 cmd.common.cdw11 = cpu_to_le32(len);
1760 return __nvme_submit_sync_cmd(ctrl->admin_q, &cmd, NULL, buffer, len,
1761 ADMIN_TIMEOUT, NVME_QID_ANY, 1, 0, false);
1763 EXPORT_SYMBOL_GPL(nvme_sec_submit);
1764 #endif /* CONFIG_BLK_SED_OPAL */
1766 static const struct block_device_operations nvme_fops = {
1767 .owner = THIS_MODULE,
1768 .ioctl = nvme_ioctl,
1769 .compat_ioctl = nvme_ioctl,
1771 .release = nvme_release,
1772 .getgeo = nvme_getgeo,
1773 .revalidate_disk= nvme_revalidate_disk,
1774 .pr_ops = &nvme_pr_ops,
1777 #ifdef CONFIG_NVME_MULTIPATH
1778 static int nvme_ns_head_open(struct block_device *bdev, fmode_t mode)
1780 struct nvme_ns_head *head = bdev->bd_disk->private_data;
1782 if (!kref_get_unless_zero(&head->ref))
1787 static void nvme_ns_head_release(struct gendisk *disk, fmode_t mode)
1789 nvme_put_ns_head(disk->private_data);
1792 const struct block_device_operations nvme_ns_head_ops = {
1793 .owner = THIS_MODULE,
1794 .open = nvme_ns_head_open,
1795 .release = nvme_ns_head_release,
1796 .ioctl = nvme_ioctl,
1797 .compat_ioctl = nvme_ioctl,
1798 .getgeo = nvme_getgeo,
1799 .pr_ops = &nvme_pr_ops,
1801 #endif /* CONFIG_NVME_MULTIPATH */
1803 static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled)
1805 unsigned long timeout =
1806 ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
1807 u32 csts, bit = enabled ? NVME_CSTS_RDY : 0;
1810 while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
1813 if ((csts & NVME_CSTS_RDY) == bit)
1817 if (fatal_signal_pending(current))
1819 if (time_after(jiffies, timeout)) {
1820 dev_err(ctrl->device,
1821 "Device not ready; aborting %s\n", enabled ?
1822 "initialisation" : "reset");
1831 * If the device has been passed off to us in an enabled state, just clear
1832 * the enabled bit. The spec says we should set the 'shutdown notification
1833 * bits', but doing so may cause the device to complete commands to the
1834 * admin queue ... and we don't know what memory that might be pointing at!
1836 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
1840 ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
1841 ctrl->ctrl_config &= ~NVME_CC_ENABLE;
1843 ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
1847 if (ctrl->quirks & NVME_QUIRK_DELAY_BEFORE_CHK_RDY)
1848 msleep(NVME_QUIRK_DELAY_AMOUNT);
1850 return nvme_wait_ready(ctrl, cap, false);
1852 EXPORT_SYMBOL_GPL(nvme_disable_ctrl);
1854 int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
1857 * Default to a 4K page size, with the intention to update this
1858 * path in the future to accomodate architectures with differing
1859 * kernel and IO page sizes.
1861 unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12, page_shift = 12;
1864 if (page_shift < dev_page_min) {
1865 dev_err(ctrl->device,
1866 "Minimum device page size %u too large for host (%u)\n",
1867 1 << dev_page_min, 1 << page_shift);
1871 ctrl->page_size = 1 << page_shift;
1873 ctrl->ctrl_config = NVME_CC_CSS_NVM;
1874 ctrl->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT;
1875 ctrl->ctrl_config |= NVME_CC_AMS_RR | NVME_CC_SHN_NONE;
1876 ctrl->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;
1877 ctrl->ctrl_config |= NVME_CC_ENABLE;
1879 ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
1882 return nvme_wait_ready(ctrl, cap, true);
1884 EXPORT_SYMBOL_GPL(nvme_enable_ctrl);
1886 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
1888 unsigned long timeout = jiffies + (ctrl->shutdown_timeout * HZ);
1892 ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
1893 ctrl->ctrl_config |= NVME_CC_SHN_NORMAL;
1895 ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
1899 while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
1900 if ((csts & NVME_CSTS_SHST_MASK) == NVME_CSTS_SHST_CMPLT)
1904 if (fatal_signal_pending(current))
1906 if (time_after(jiffies, timeout)) {
1907 dev_err(ctrl->device,
1908 "Device shutdown incomplete; abort shutdown\n");
1915 EXPORT_SYMBOL_GPL(nvme_shutdown_ctrl);
1917 static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
1918 struct request_queue *q)
1922 if (ctrl->max_hw_sectors) {
1924 (ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1;
1926 max_segments = min_not_zero(max_segments, ctrl->max_segments);
1927 blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
1928 blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
1930 if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) &&
1931 is_power_of_2(ctrl->max_hw_sectors))
1932 blk_queue_chunk_sectors(q, ctrl->max_hw_sectors);
1933 blk_queue_virt_boundary(q, ctrl->page_size - 1);
1934 if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
1936 blk_queue_write_cache(q, vwc, vwc);
1939 static int nvme_configure_timestamp(struct nvme_ctrl *ctrl)
1944 if (!(ctrl->oncs & NVME_CTRL_ONCS_TIMESTAMP))
1947 ts = cpu_to_le64(ktime_to_ms(ktime_get_real()));
1948 ret = nvme_set_features(ctrl, NVME_FEAT_TIMESTAMP, 0, &ts, sizeof(ts),
1951 dev_warn_once(ctrl->device,
1952 "could not set timestamp (%d)\n", ret);
1956 static int nvme_configure_acre(struct nvme_ctrl *ctrl)
1958 struct nvme_feat_host_behavior *host;
1961 /* Don't bother enabling the feature if retry delay is not reported */
1965 host = kzalloc(sizeof(*host), GFP_KERNEL);
1969 host->acre = NVME_ENABLE_ACRE;
1970 ret = nvme_set_features(ctrl, NVME_FEAT_HOST_BEHAVIOR, 0,
1971 host, sizeof(*host), NULL);
1976 static int nvme_configure_apst(struct nvme_ctrl *ctrl)
1979 * APST (Autonomous Power State Transition) lets us program a
1980 * table of power state transitions that the controller will
1981 * perform automatically. We configure it with a simple
1982 * heuristic: we are willing to spend at most 2% of the time
1983 * transitioning between power states. Therefore, when running
1984 * in any given state, we will enter the next lower-power
1985 * non-operational state after waiting 50 * (enlat + exlat)
1986 * microseconds, as long as that state's exit latency is under
1987 * the requested maximum latency.
1989 * We will not autonomously enter any non-operational state for
1990 * which the total latency exceeds ps_max_latency_us. Users
1991 * can set ps_max_latency_us to zero to turn off APST.
1995 struct nvme_feat_auto_pst *table;
2001 * If APST isn't supported or if we haven't been initialized yet,
2002 * then don't do anything.
2007 if (ctrl->npss > 31) {
2008 dev_warn(ctrl->device, "NPSS is invalid; not using APST\n");
2012 table = kzalloc(sizeof(*table), GFP_KERNEL);
2016 if (!ctrl->apst_enabled || ctrl->ps_max_latency_us == 0) {
2017 /* Turn off APST. */
2019 dev_dbg(ctrl->device, "APST disabled\n");
2021 __le64 target = cpu_to_le64(0);
2025 * Walk through all states from lowest- to highest-power.
2026 * According to the spec, lower-numbered states use more
2027 * power. NPSS, despite the name, is the index of the
2028 * lowest-power state, not the number of states.
2030 for (state = (int)ctrl->npss; state >= 0; state--) {
2031 u64 total_latency_us, exit_latency_us, transition_ms;
2034 table->entries[state] = target;
2037 * Don't allow transitions to the deepest state
2038 * if it's quirked off.
2040 if (state == ctrl->npss &&
2041 (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS))
2045 * Is this state a useful non-operational state for
2046 * higher-power states to autonomously transition to?
2048 if (!(ctrl->psd[state].flags &
2049 NVME_PS_FLAGS_NON_OP_STATE))
2053 (u64)le32_to_cpu(ctrl->psd[state].exit_lat);
2054 if (exit_latency_us > ctrl->ps_max_latency_us)
2059 le32_to_cpu(ctrl->psd[state].entry_lat);
2062 * This state is good. Use it as the APST idle
2063 * target for higher power states.
2065 transition_ms = total_latency_us + 19;
2066 do_div(transition_ms, 20);
2067 if (transition_ms > (1 << 24) - 1)
2068 transition_ms = (1 << 24) - 1;
2070 target = cpu_to_le64((state << 3) |
2071 (transition_ms << 8));
2076 if (total_latency_us > max_lat_us)
2077 max_lat_us = total_latency_us;
2083 dev_dbg(ctrl->device, "APST enabled but no non-operational states are available\n");
2085 dev_dbg(ctrl->device, "APST enabled: max PS = %d, max round-trip latency = %lluus, table = %*phN\n",
2086 max_ps, max_lat_us, (int)sizeof(*table), table);
2090 ret = nvme_set_features(ctrl, NVME_FEAT_AUTO_PST, apste,
2091 table, sizeof(*table), NULL);
2093 dev_err(ctrl->device, "failed to set APST feature (%d)\n", ret);
2099 static void nvme_set_latency_tolerance(struct device *dev, s32 val)
2101 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
2105 case PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT:
2106 case PM_QOS_LATENCY_ANY:
2114 if (ctrl->ps_max_latency_us != latency) {
2115 ctrl->ps_max_latency_us = latency;
2116 nvme_configure_apst(ctrl);
2120 struct nvme_core_quirk_entry {
2122 * NVMe model and firmware strings are padded with spaces. For
2123 * simplicity, strings in the quirk table are padded with NULLs
2129 unsigned long quirks;
2132 static const struct nvme_core_quirk_entry core_quirks[] = {
2135 * This Toshiba device seems to die using any APST states. See:
2136 * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1678184/comments/11
2139 .mn = "THNSF5256GPUK TOSHIBA",
2140 .quirks = NVME_QUIRK_NO_APST,
2144 /* match is null-terminated but idstr is space-padded. */
2145 static bool string_matches(const char *idstr, const char *match, size_t len)
2152 matchlen = strlen(match);
2153 WARN_ON_ONCE(matchlen > len);
2155 if (memcmp(idstr, match, matchlen))
2158 for (; matchlen < len; matchlen++)
2159 if (idstr[matchlen] != ' ')
2165 static bool quirk_matches(const struct nvme_id_ctrl *id,
2166 const struct nvme_core_quirk_entry *q)
2168 return q->vid == le16_to_cpu(id->vid) &&
2169 string_matches(id->mn, q->mn, sizeof(id->mn)) &&
2170 string_matches(id->fr, q->fr, sizeof(id->fr));
2173 static void nvme_init_subnqn(struct nvme_subsystem *subsys, struct nvme_ctrl *ctrl,
2174 struct nvme_id_ctrl *id)
2179 if(!(ctrl->quirks & NVME_QUIRK_IGNORE_DEV_SUBNQN)) {
2180 nqnlen = strnlen(id->subnqn, NVMF_NQN_SIZE);
2181 if (nqnlen > 0 && nqnlen < NVMF_NQN_SIZE) {
2182 strlcpy(subsys->subnqn, id->subnqn, NVMF_NQN_SIZE);
2186 if (ctrl->vs >= NVME_VS(1, 2, 1))
2187 dev_warn(ctrl->device, "missing or invalid SUBNQN field.\n");
2190 /* Generate a "fake" NQN per Figure 254 in NVMe 1.3 + ECN 001 */
2191 off = snprintf(subsys->subnqn, NVMF_NQN_SIZE,
2192 "nqn.2014.08.org.nvmexpress:%04x%04x",
2193 le16_to_cpu(id->vid), le16_to_cpu(id->ssvid));
2194 memcpy(subsys->subnqn + off, id->sn, sizeof(id->sn));
2195 off += sizeof(id->sn);
2196 memcpy(subsys->subnqn + off, id->mn, sizeof(id->mn));
2197 off += sizeof(id->mn);
2198 memset(subsys->subnqn + off, 0, sizeof(subsys->subnqn) - off);
2201 static void __nvme_release_subsystem(struct nvme_subsystem *subsys)
2203 ida_simple_remove(&nvme_subsystems_ida, subsys->instance);
2207 static void nvme_release_subsystem(struct device *dev)
2209 __nvme_release_subsystem(container_of(dev, struct nvme_subsystem, dev));
2212 static void nvme_destroy_subsystem(struct kref *ref)
2214 struct nvme_subsystem *subsys =
2215 container_of(ref, struct nvme_subsystem, ref);
2217 mutex_lock(&nvme_subsystems_lock);
2218 list_del(&subsys->entry);
2219 mutex_unlock(&nvme_subsystems_lock);
2221 ida_destroy(&subsys->ns_ida);
2222 device_del(&subsys->dev);
2223 put_device(&subsys->dev);
2226 static void nvme_put_subsystem(struct nvme_subsystem *subsys)
2228 kref_put(&subsys->ref, nvme_destroy_subsystem);
2231 static struct nvme_subsystem *__nvme_find_get_subsystem(const char *subsysnqn)
2233 struct nvme_subsystem *subsys;
2235 lockdep_assert_held(&nvme_subsystems_lock);
2237 list_for_each_entry(subsys, &nvme_subsystems, entry) {
2238 if (strcmp(subsys->subnqn, subsysnqn))
2240 if (!kref_get_unless_zero(&subsys->ref))
2248 #define SUBSYS_ATTR_RO(_name, _mode, _show) \
2249 struct device_attribute subsys_attr_##_name = \
2250 __ATTR(_name, _mode, _show, NULL)
2252 static ssize_t nvme_subsys_show_nqn(struct device *dev,
2253 struct device_attribute *attr,
2256 struct nvme_subsystem *subsys =
2257 container_of(dev, struct nvme_subsystem, dev);
2259 return snprintf(buf, PAGE_SIZE, "%s\n", subsys->subnqn);
2261 static SUBSYS_ATTR_RO(subsysnqn, S_IRUGO, nvme_subsys_show_nqn);
2263 #define nvme_subsys_show_str_function(field) \
2264 static ssize_t subsys_##field##_show(struct device *dev, \
2265 struct device_attribute *attr, char *buf) \
2267 struct nvme_subsystem *subsys = \
2268 container_of(dev, struct nvme_subsystem, dev); \
2269 return sprintf(buf, "%.*s\n", \
2270 (int)sizeof(subsys->field), subsys->field); \
2272 static SUBSYS_ATTR_RO(field, S_IRUGO, subsys_##field##_show);
2274 nvme_subsys_show_str_function(model);
2275 nvme_subsys_show_str_function(serial);
2276 nvme_subsys_show_str_function(firmware_rev);
2278 static struct attribute *nvme_subsys_attrs[] = {
2279 &subsys_attr_model.attr,
2280 &subsys_attr_serial.attr,
2281 &subsys_attr_firmware_rev.attr,
2282 &subsys_attr_subsysnqn.attr,
2286 static struct attribute_group nvme_subsys_attrs_group = {
2287 .attrs = nvme_subsys_attrs,
2290 static const struct attribute_group *nvme_subsys_attrs_groups[] = {
2291 &nvme_subsys_attrs_group,
2295 static int nvme_active_ctrls(struct nvme_subsystem *subsys)
2298 struct nvme_ctrl *ctrl;
2300 mutex_lock(&subsys->lock);
2301 list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) {
2302 if (ctrl->state != NVME_CTRL_DELETING &&
2303 ctrl->state != NVME_CTRL_DEAD)
2306 mutex_unlock(&subsys->lock);
2311 static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
2313 struct nvme_subsystem *subsys, *found;
2316 subsys = kzalloc(sizeof(*subsys), GFP_KERNEL);
2319 ret = ida_simple_get(&nvme_subsystems_ida, 0, 0, GFP_KERNEL);
2324 subsys->instance = ret;
2325 mutex_init(&subsys->lock);
2326 kref_init(&subsys->ref);
2327 INIT_LIST_HEAD(&subsys->ctrls);
2328 INIT_LIST_HEAD(&subsys->nsheads);
2329 nvme_init_subnqn(subsys, ctrl, id);
2330 memcpy(subsys->serial, id->sn, sizeof(subsys->serial));
2331 memcpy(subsys->model, id->mn, sizeof(subsys->model));
2332 memcpy(subsys->firmware_rev, id->fr, sizeof(subsys->firmware_rev));
2333 subsys->vendor_id = le16_to_cpu(id->vid);
2334 subsys->cmic = id->cmic;
2336 subsys->dev.class = nvme_subsys_class;
2337 subsys->dev.release = nvme_release_subsystem;
2338 subsys->dev.groups = nvme_subsys_attrs_groups;
2339 dev_set_name(&subsys->dev, "nvme-subsys%d", subsys->instance);
2340 device_initialize(&subsys->dev);
2342 mutex_lock(&nvme_subsystems_lock);
2343 found = __nvme_find_get_subsystem(subsys->subnqn);
2346 * Verify that the subsystem actually supports multiple
2347 * controllers, else bail out.
2349 if (!(ctrl->opts && ctrl->opts->discovery_nqn) &&
2350 nvme_active_ctrls(found) && !(id->cmic & (1 << 1))) {
2351 dev_err(ctrl->device,
2352 "ignoring ctrl due to duplicate subnqn (%s).\n",
2354 nvme_put_subsystem(found);
2359 __nvme_release_subsystem(subsys);
2362 ret = device_add(&subsys->dev);
2364 dev_err(ctrl->device,
2365 "failed to register subsystem device.\n");
2368 ida_init(&subsys->ns_ida);
2369 list_add_tail(&subsys->entry, &nvme_subsystems);
2372 ctrl->subsys = subsys;
2373 mutex_unlock(&nvme_subsystems_lock);
2375 if (sysfs_create_link(&subsys->dev.kobj, &ctrl->device->kobj,
2376 dev_name(ctrl->device))) {
2377 dev_err(ctrl->device,
2378 "failed to create sysfs link from subsystem.\n");
2379 /* the transport driver will eventually put the subsystem */
2383 mutex_lock(&subsys->lock);
2384 list_add_tail(&ctrl->subsys_entry, &subsys->ctrls);
2385 mutex_unlock(&subsys->lock);
2390 mutex_unlock(&nvme_subsystems_lock);
2391 put_device(&subsys->dev);
2395 int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp,
2396 void *log, size_t size, u64 offset)
2398 struct nvme_command c = { };
2399 unsigned long dwlen = size / 4 - 1;
2401 c.get_log_page.opcode = nvme_admin_get_log_page;
2402 c.get_log_page.nsid = cpu_to_le32(nsid);
2403 c.get_log_page.lid = log_page;
2404 c.get_log_page.lsp = lsp;
2405 c.get_log_page.numdl = cpu_to_le16(dwlen & ((1 << 16) - 1));
2406 c.get_log_page.numdu = cpu_to_le16(dwlen >> 16);
2407 c.get_log_page.lpol = cpu_to_le32(lower_32_bits(offset));
2408 c.get_log_page.lpou = cpu_to_le32(upper_32_bits(offset));
2410 return nvme_submit_sync_cmd(ctrl->admin_q, &c, log, size);
2413 static int nvme_get_effects_log(struct nvme_ctrl *ctrl)
2418 ctrl->effects = kzalloc(sizeof(*ctrl->effects), GFP_KERNEL);
2423 ret = nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_CMD_EFFECTS, 0,
2424 ctrl->effects, sizeof(*ctrl->effects), 0);
2426 kfree(ctrl->effects);
2427 ctrl->effects = NULL;
2433 * Initialize the cached copies of the Identify data and various controller
2434 * register in our nvme_ctrl structure. This should be called as soon as
2435 * the admin queue is fully up and running.
2437 int nvme_init_identify(struct nvme_ctrl *ctrl)
2439 struct nvme_id_ctrl *id;
2441 int ret, page_shift;
2443 bool prev_apst_enabled;
2445 ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs);
2447 dev_err(ctrl->device, "Reading VS failed (%d)\n", ret);
2451 ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &cap);
2453 dev_err(ctrl->device, "Reading CAP failed (%d)\n", ret);
2456 page_shift = NVME_CAP_MPSMIN(cap) + 12;
2458 if (ctrl->vs >= NVME_VS(1, 1, 0))
2459 ctrl->subsystem = NVME_CAP_NSSRC(cap);
2461 ret = nvme_identify_ctrl(ctrl, &id);
2463 dev_err(ctrl->device, "Identify Controller failed (%d)\n", ret);
2467 if (id->lpa & NVME_CTRL_LPA_CMD_EFFECTS_LOG) {
2468 ret = nvme_get_effects_log(ctrl);
2473 if (!ctrl->identified) {
2476 ret = nvme_init_subsystem(ctrl, id);
2481 * Check for quirks. Quirk can depend on firmware version,
2482 * so, in principle, the set of quirks present can change
2483 * across a reset. As a possible future enhancement, we
2484 * could re-scan for quirks every time we reinitialize
2485 * the device, but we'd have to make sure that the driver
2486 * behaves intelligently if the quirks change.
2488 for (i = 0; i < ARRAY_SIZE(core_quirks); i++) {
2489 if (quirk_matches(id, &core_quirks[i]))
2490 ctrl->quirks |= core_quirks[i].quirks;
2494 if (force_apst && (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS)) {
2495 dev_warn(ctrl->device, "forcibly allowing all power states due to nvme_core.force_apst -- use at your own risk\n");
2496 ctrl->quirks &= ~NVME_QUIRK_NO_DEEPEST_PS;
2499 ctrl->crdt[0] = le16_to_cpu(id->crdt1);
2500 ctrl->crdt[1] = le16_to_cpu(id->crdt2);
2501 ctrl->crdt[2] = le16_to_cpu(id->crdt3);
2503 ctrl->oacs = le16_to_cpu(id->oacs);
2504 ctrl->oncs = le16_to_cpup(&id->oncs);
2505 ctrl->oaes = le32_to_cpu(id->oaes);
2506 atomic_set(&ctrl->abort_limit, id->acl + 1);
2507 ctrl->vwc = id->vwc;
2509 max_hw_sectors = 1 << (id->mdts + page_shift - 9);
2511 max_hw_sectors = UINT_MAX;
2512 ctrl->max_hw_sectors =
2513 min_not_zero(ctrl->max_hw_sectors, max_hw_sectors);
2515 nvme_set_queue_limits(ctrl, ctrl->admin_q);
2516 ctrl->sgls = le32_to_cpu(id->sgls);
2517 ctrl->kas = le16_to_cpu(id->kas);
2518 ctrl->max_namespaces = le32_to_cpu(id->mnan);
2519 ctrl->ctratt = le32_to_cpu(id->ctratt);
2523 u32 transition_time = le32_to_cpu(id->rtd3e) / 1000000;
2525 ctrl->shutdown_timeout = clamp_t(unsigned int, transition_time,
2526 shutdown_timeout, 60);
2528 if (ctrl->shutdown_timeout != shutdown_timeout)
2529 dev_info(ctrl->device,
2530 "Shutdown timeout set to %u seconds\n",
2531 ctrl->shutdown_timeout);
2533 ctrl->shutdown_timeout = shutdown_timeout;
2535 ctrl->npss = id->npss;
2536 ctrl->apsta = id->apsta;
2537 prev_apst_enabled = ctrl->apst_enabled;
2538 if (ctrl->quirks & NVME_QUIRK_NO_APST) {
2539 if (force_apst && id->apsta) {
2540 dev_warn(ctrl->device, "forcibly allowing APST due to nvme_core.force_apst -- use at your own risk\n");
2541 ctrl->apst_enabled = true;
2543 ctrl->apst_enabled = false;
2546 ctrl->apst_enabled = id->apsta;
2548 memcpy(ctrl->psd, id->psd, sizeof(ctrl->psd));
2550 if (ctrl->ops->flags & NVME_F_FABRICS) {
2551 ctrl->icdoff = le16_to_cpu(id->icdoff);
2552 ctrl->ioccsz = le32_to_cpu(id->ioccsz);
2553 ctrl->iorcsz = le32_to_cpu(id->iorcsz);
2554 ctrl->maxcmd = le16_to_cpu(id->maxcmd);
2557 * In fabrics we need to verify the cntlid matches the
2560 if (ctrl->cntlid != le16_to_cpu(id->cntlid)) {
2565 if (!ctrl->opts->discovery_nqn && !ctrl->kas) {
2566 dev_err(ctrl->device,
2567 "keep-alive support is mandatory for fabrics\n");
2572 ctrl->cntlid = le16_to_cpu(id->cntlid);
2573 ctrl->hmpre = le32_to_cpu(id->hmpre);
2574 ctrl->hmmin = le32_to_cpu(id->hmmin);
2575 ctrl->hmminds = le32_to_cpu(id->hmminds);
2576 ctrl->hmmaxd = le16_to_cpu(id->hmmaxd);
2579 ret = nvme_mpath_init(ctrl, id);
2585 if (ctrl->apst_enabled && !prev_apst_enabled)
2586 dev_pm_qos_expose_latency_tolerance(ctrl->device);
2587 else if (!ctrl->apst_enabled && prev_apst_enabled)
2588 dev_pm_qos_hide_latency_tolerance(ctrl->device);
2590 ret = nvme_configure_apst(ctrl);
2594 ret = nvme_configure_timestamp(ctrl);
2598 ret = nvme_configure_directives(ctrl);
2602 ret = nvme_configure_acre(ctrl);
2606 ctrl->identified = true;
2614 EXPORT_SYMBOL_GPL(nvme_init_identify);
2616 static int nvme_dev_open(struct inode *inode, struct file *file)
2618 struct nvme_ctrl *ctrl =
2619 container_of(inode->i_cdev, struct nvme_ctrl, cdev);
2621 switch (ctrl->state) {
2622 case NVME_CTRL_LIVE:
2623 case NVME_CTRL_ADMIN_ONLY:
2626 return -EWOULDBLOCK;
2629 file->private_data = ctrl;
2633 static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp)
2638 down_read(&ctrl->namespaces_rwsem);
2639 if (list_empty(&ctrl->namespaces)) {
2644 ns = list_first_entry(&ctrl->namespaces, struct nvme_ns, list);
2645 if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) {
2646 dev_warn(ctrl->device,
2647 "NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n");
2652 dev_warn(ctrl->device,
2653 "using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n");
2654 kref_get(&ns->kref);
2655 up_read(&ctrl->namespaces_rwsem);
2657 ret = nvme_user_cmd(ctrl, ns, argp);
2662 up_read(&ctrl->namespaces_rwsem);
2666 static long nvme_dev_ioctl(struct file *file, unsigned int cmd,
2669 struct nvme_ctrl *ctrl = file->private_data;
2670 void __user *argp = (void __user *)arg;
2673 case NVME_IOCTL_ADMIN_CMD:
2674 return nvme_user_cmd(ctrl, NULL, argp);
2675 case NVME_IOCTL_IO_CMD:
2676 return nvme_dev_user_cmd(ctrl, argp);
2677 case NVME_IOCTL_RESET:
2678 dev_warn(ctrl->device, "resetting controller\n");
2679 return nvme_reset_ctrl_sync(ctrl);
2680 case NVME_IOCTL_SUBSYS_RESET:
2681 return nvme_reset_subsystem(ctrl);
2682 case NVME_IOCTL_RESCAN:
2683 nvme_queue_scan(ctrl);
2690 static const struct file_operations nvme_dev_fops = {
2691 .owner = THIS_MODULE,
2692 .open = nvme_dev_open,
2693 .unlocked_ioctl = nvme_dev_ioctl,
2694 .compat_ioctl = nvme_dev_ioctl,
2697 static ssize_t nvme_sysfs_reset(struct device *dev,
2698 struct device_attribute *attr, const char *buf,
2701 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
2704 ret = nvme_reset_ctrl_sync(ctrl);
2709 static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset);
2711 static ssize_t nvme_sysfs_rescan(struct device *dev,
2712 struct device_attribute *attr, const char *buf,
2715 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
2717 nvme_queue_scan(ctrl);
2720 static DEVICE_ATTR(rescan_controller, S_IWUSR, NULL, nvme_sysfs_rescan);
2722 static inline struct nvme_ns_head *dev_to_ns_head(struct device *dev)
2724 struct gendisk *disk = dev_to_disk(dev);
2726 if (disk->fops == &nvme_fops)
2727 return nvme_get_ns_from_dev(dev)->head;
2729 return disk->private_data;
2732 static ssize_t wwid_show(struct device *dev, struct device_attribute *attr,
2735 struct nvme_ns_head *head = dev_to_ns_head(dev);
2736 struct nvme_ns_ids *ids = &head->ids;
2737 struct nvme_subsystem *subsys = head->subsys;
2738 int serial_len = sizeof(subsys->serial);
2739 int model_len = sizeof(subsys->model);
2741 if (!uuid_is_null(&ids->uuid))
2742 return sprintf(buf, "uuid.%pU\n", &ids->uuid);
2744 if (memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
2745 return sprintf(buf, "eui.%16phN\n", ids->nguid);
2747 if (memchr_inv(ids->eui64, 0, sizeof(ids->eui64)))
2748 return sprintf(buf, "eui.%8phN\n", ids->eui64);
2750 while (serial_len > 0 && (subsys->serial[serial_len - 1] == ' ' ||
2751 subsys->serial[serial_len - 1] == '\0'))
2753 while (model_len > 0 && (subsys->model[model_len - 1] == ' ' ||
2754 subsys->model[model_len - 1] == '\0'))
2757 return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", subsys->vendor_id,
2758 serial_len, subsys->serial, model_len, subsys->model,
2761 static DEVICE_ATTR_RO(wwid);
2763 static ssize_t nguid_show(struct device *dev, struct device_attribute *attr,
2766 return sprintf(buf, "%pU\n", dev_to_ns_head(dev)->ids.nguid);
2768 static DEVICE_ATTR_RO(nguid);
2770 static ssize_t uuid_show(struct device *dev, struct device_attribute *attr,
2773 struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids;
2775 /* For backward compatibility expose the NGUID to userspace if
2776 * we have no UUID set
2778 if (uuid_is_null(&ids->uuid)) {
2779 printk_ratelimited(KERN_WARNING
2780 "No UUID available providing old NGUID\n");
2781 return sprintf(buf, "%pU\n", ids->nguid);
2783 return sprintf(buf, "%pU\n", &ids->uuid);
2785 static DEVICE_ATTR_RO(uuid);
2787 static ssize_t eui_show(struct device *dev, struct device_attribute *attr,
2790 return sprintf(buf, "%8ph\n", dev_to_ns_head(dev)->ids.eui64);
2792 static DEVICE_ATTR_RO(eui);
2794 static ssize_t nsid_show(struct device *dev, struct device_attribute *attr,
2797 return sprintf(buf, "%d\n", dev_to_ns_head(dev)->ns_id);
2799 static DEVICE_ATTR_RO(nsid);
2801 static struct attribute *nvme_ns_id_attrs[] = {
2802 &dev_attr_wwid.attr,
2803 &dev_attr_uuid.attr,
2804 &dev_attr_nguid.attr,
2806 &dev_attr_nsid.attr,
2807 #ifdef CONFIG_NVME_MULTIPATH
2808 &dev_attr_ana_grpid.attr,
2809 &dev_attr_ana_state.attr,
2814 static umode_t nvme_ns_id_attrs_are_visible(struct kobject *kobj,
2815 struct attribute *a, int n)
2817 struct device *dev = container_of(kobj, struct device, kobj);
2818 struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids;
2820 if (a == &dev_attr_uuid.attr) {
2821 if (uuid_is_null(&ids->uuid) &&
2822 !memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
2825 if (a == &dev_attr_nguid.attr) {
2826 if (!memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
2829 if (a == &dev_attr_eui.attr) {
2830 if (!memchr_inv(ids->eui64, 0, sizeof(ids->eui64)))
2833 #ifdef CONFIG_NVME_MULTIPATH
2834 if (a == &dev_attr_ana_grpid.attr || a == &dev_attr_ana_state.attr) {
2835 if (dev_to_disk(dev)->fops != &nvme_fops) /* per-path attr */
2837 if (!nvme_ctrl_use_ana(nvme_get_ns_from_dev(dev)->ctrl))
2844 static const struct attribute_group nvme_ns_id_attr_group = {
2845 .attrs = nvme_ns_id_attrs,
2846 .is_visible = nvme_ns_id_attrs_are_visible,
2849 const struct attribute_group *nvme_ns_id_attr_groups[] = {
2850 &nvme_ns_id_attr_group,
2852 &nvme_nvm_attr_group,
2857 #define nvme_show_str_function(field) \
2858 static ssize_t field##_show(struct device *dev, \
2859 struct device_attribute *attr, char *buf) \
2861 struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \
2862 return sprintf(buf, "%.*s\n", \
2863 (int)sizeof(ctrl->subsys->field), ctrl->subsys->field); \
2865 static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
2867 nvme_show_str_function(model);
2868 nvme_show_str_function(serial);
2869 nvme_show_str_function(firmware_rev);
2871 #define nvme_show_int_function(field) \
2872 static ssize_t field##_show(struct device *dev, \
2873 struct device_attribute *attr, char *buf) \
2875 struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \
2876 return sprintf(buf, "%d\n", ctrl->field); \
2878 static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
2880 nvme_show_int_function(cntlid);
2881 nvme_show_int_function(numa_node);
2883 static ssize_t nvme_sysfs_delete(struct device *dev,
2884 struct device_attribute *attr, const char *buf,
2887 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
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,
2961 &dev_attr_numa_node.attr,
2965 static umode_t nvme_dev_attrs_are_visible(struct kobject *kobj,
2966 struct attribute *a, int n)
2968 struct device *dev = container_of(kobj, struct device, kobj);
2969 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
2971 if (a == &dev_attr_delete_controller.attr && !ctrl->ops->delete_ctrl)
2973 if (a == &dev_attr_address.attr && !ctrl->ops->get_address)
2979 static struct attribute_group nvme_dev_attrs_group = {
2980 .attrs = nvme_dev_attrs,
2981 .is_visible = nvme_dev_attrs_are_visible,
2984 static const struct attribute_group *nvme_dev_attr_groups[] = {
2985 &nvme_dev_attrs_group,
2989 static struct nvme_ns_head *__nvme_find_ns_head(struct nvme_subsystem *subsys,
2992 struct nvme_ns_head *h;
2994 lockdep_assert_held(&subsys->lock);
2996 list_for_each_entry(h, &subsys->nsheads, entry) {
2997 if (h->ns_id == nsid && kref_get_unless_zero(&h->ref))
3004 static int __nvme_check_ids(struct nvme_subsystem *subsys,
3005 struct nvme_ns_head *new)
3007 struct nvme_ns_head *h;
3009 lockdep_assert_held(&subsys->lock);
3011 list_for_each_entry(h, &subsys->nsheads, entry) {
3012 if (nvme_ns_ids_valid(&new->ids) &&
3013 !list_empty(&h->list) &&
3014 nvme_ns_ids_equal(&new->ids, &h->ids))
3021 static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl,
3022 unsigned nsid, struct nvme_id_ns *id)
3024 struct nvme_ns_head *head;
3025 size_t size = sizeof(*head);
3028 #ifdef CONFIG_NVME_MULTIPATH
3029 size += num_possible_nodes() * sizeof(struct nvme_ns *);
3032 head = kzalloc(size, GFP_KERNEL);
3035 ret = ida_simple_get(&ctrl->subsys->ns_ida, 1, 0, GFP_KERNEL);
3038 head->instance = ret;
3039 INIT_LIST_HEAD(&head->list);
3040 ret = init_srcu_struct(&head->srcu);
3042 goto out_ida_remove;
3043 head->subsys = ctrl->subsys;
3045 kref_init(&head->ref);
3047 nvme_report_ns_ids(ctrl, nsid, id, &head->ids);
3049 ret = __nvme_check_ids(ctrl->subsys, head);
3051 dev_err(ctrl->device,
3052 "duplicate IDs for nsid %d\n", nsid);
3053 goto out_cleanup_srcu;
3056 ret = nvme_mpath_alloc_disk(ctrl, head);
3058 goto out_cleanup_srcu;
3060 list_add_tail(&head->entry, &ctrl->subsys->nsheads);
3062 kref_get(&ctrl->subsys->ref);
3066 cleanup_srcu_struct(&head->srcu);
3068 ida_simple_remove(&ctrl->subsys->ns_ida, head->instance);
3072 return ERR_PTR(ret);
3075 static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid,
3076 struct nvme_id_ns *id)
3078 struct nvme_ctrl *ctrl = ns->ctrl;
3079 bool is_shared = id->nmic & (1 << 0);
3080 struct nvme_ns_head *head = NULL;
3083 mutex_lock(&ctrl->subsys->lock);
3085 head = __nvme_find_ns_head(ctrl->subsys, nsid);
3087 head = nvme_alloc_ns_head(ctrl, nsid, id);
3089 ret = PTR_ERR(head);
3093 struct nvme_ns_ids ids;
3095 nvme_report_ns_ids(ctrl, nsid, id, &ids);
3096 if (!nvme_ns_ids_equal(&head->ids, &ids)) {
3097 dev_err(ctrl->device,
3098 "IDs don't match for shared namespace %d\n",
3105 list_add_tail(&ns->siblings, &head->list);
3109 mutex_unlock(&ctrl->subsys->lock);
3113 static int ns_cmp(void *priv, struct list_head *a, struct list_head *b)
3115 struct nvme_ns *nsa = container_of(a, struct nvme_ns, list);
3116 struct nvme_ns *nsb = container_of(b, struct nvme_ns, list);
3118 return nsa->head->ns_id - nsb->head->ns_id;
3121 static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid)
3123 struct nvme_ns *ns, *ret = NULL;
3125 down_read(&ctrl->namespaces_rwsem);
3126 list_for_each_entry(ns, &ctrl->namespaces, list) {
3127 if (ns->head->ns_id == nsid) {
3128 if (!kref_get_unless_zero(&ns->kref))
3133 if (ns->head->ns_id > nsid)
3136 up_read(&ctrl->namespaces_rwsem);
3140 static int nvme_setup_streams_ns(struct nvme_ctrl *ctrl, struct nvme_ns *ns)
3142 struct streams_directive_params s;
3145 if (!ctrl->nr_streams)
3148 ret = nvme_get_stream_params(ctrl, &s, ns->head->ns_id);
3152 ns->sws = le32_to_cpu(s.sws);
3153 ns->sgs = le16_to_cpu(s.sgs);
3156 unsigned int bs = 1 << ns->lba_shift;
3158 blk_queue_io_min(ns->queue, bs * ns->sws);
3160 blk_queue_io_opt(ns->queue, bs * ns->sws * ns->sgs);
3166 static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
3169 struct gendisk *disk;
3170 struct nvme_id_ns *id;
3171 char disk_name[DISK_NAME_LEN];
3172 int node = ctrl->numa_node, flags = GENHD_FL_EXT_DEVT;
3174 ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node);
3178 ns->queue = blk_mq_init_queue(ctrl->tagset);
3179 if (IS_ERR(ns->queue))
3182 blk_queue_flag_set(QUEUE_FLAG_NONROT, ns->queue);
3183 if (ctrl->ops->flags & NVME_F_PCI_P2PDMA)
3184 blk_queue_flag_set(QUEUE_FLAG_PCI_P2PDMA, ns->queue);
3186 ns->queue->queuedata = ns;
3189 kref_init(&ns->kref);
3190 ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */
3192 blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
3193 nvme_set_queue_limits(ctrl, ns->queue);
3195 id = nvme_identify_ns(ctrl, nsid);
3197 goto out_free_queue;
3202 if (nvme_init_ns_head(ns, nsid, id))
3204 nvme_setup_streams_ns(ctrl, ns);
3205 nvme_set_disk_name(disk_name, ns, ctrl, &flags);
3207 disk = alloc_disk_node(0, node);
3211 disk->fops = &nvme_fops;
3212 disk->private_data = ns;
3213 disk->queue = ns->queue;
3214 disk->flags = flags;
3215 memcpy(disk->disk_name, disk_name, DISK_NAME_LEN);
3218 __nvme_revalidate_disk(disk, id);
3220 if ((ctrl->quirks & NVME_QUIRK_LIGHTNVM) && id->vs[0] == 0x1) {
3221 if (nvme_nvm_register(ns, disk_name, node)) {
3222 dev_warn(ctrl->device, "LightNVM init failure\n");
3227 down_write(&ctrl->namespaces_rwsem);
3228 list_add_tail(&ns->list, &ctrl->namespaces);
3229 up_write(&ctrl->namespaces_rwsem);
3231 nvme_get_ctrl(ctrl);
3233 device_add_disk(ctrl->device, ns->disk, nvme_ns_id_attr_groups);
3235 nvme_mpath_add_disk(ns, id);
3236 nvme_fault_inject_init(ns);
3243 mutex_lock(&ctrl->subsys->lock);
3244 list_del_rcu(&ns->siblings);
3245 mutex_unlock(&ctrl->subsys->lock);
3249 blk_cleanup_queue(ns->queue);
3254 static void nvme_ns_remove(struct nvme_ns *ns)
3256 if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags))
3259 nvme_fault_inject_fini(ns);
3260 if (ns->disk && ns->disk->flags & GENHD_FL_UP) {
3261 del_gendisk(ns->disk);
3262 blk_cleanup_queue(ns->queue);
3263 if (blk_get_integrity(ns->disk))
3264 blk_integrity_unregister(ns->disk);
3267 mutex_lock(&ns->ctrl->subsys->lock);
3268 list_del_rcu(&ns->siblings);
3269 nvme_mpath_clear_current_path(ns);
3270 mutex_unlock(&ns->ctrl->subsys->lock);
3272 down_write(&ns->ctrl->namespaces_rwsem);
3273 list_del_init(&ns->list);
3274 up_write(&ns->ctrl->namespaces_rwsem);
3276 synchronize_srcu(&ns->head->srcu);
3277 nvme_mpath_check_last_path(ns);
3281 static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid)
3285 ns = nvme_find_get_ns(ctrl, nsid);
3287 if (ns->disk && revalidate_disk(ns->disk))
3291 nvme_alloc_ns(ctrl, nsid);
3294 static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl,
3297 struct nvme_ns *ns, *next;
3300 down_write(&ctrl->namespaces_rwsem);
3301 list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) {
3302 if (ns->head->ns_id > nsid || test_bit(NVME_NS_DEAD, &ns->flags))
3303 list_move_tail(&ns->list, &rm_list);
3305 up_write(&ctrl->namespaces_rwsem);
3307 list_for_each_entry_safe(ns, next, &rm_list, list)
3312 static int nvme_scan_ns_list(struct nvme_ctrl *ctrl, unsigned nn)
3316 unsigned i, j, nsid, prev = 0, num_lists = DIV_ROUND_UP(nn, 1024);
3319 ns_list = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL);
3323 for (i = 0; i < num_lists; i++) {
3324 ret = nvme_identify_ns_list(ctrl, prev, ns_list);
3328 for (j = 0; j < min(nn, 1024U); j++) {
3329 nsid = le32_to_cpu(ns_list[j]);
3333 nvme_validate_ns(ctrl, nsid);
3335 while (++prev < nsid) {
3336 ns = nvme_find_get_ns(ctrl, prev);
3346 nvme_remove_invalid_namespaces(ctrl, prev);
3352 static void nvme_scan_ns_sequential(struct nvme_ctrl *ctrl, unsigned nn)
3356 for (i = 1; i <= nn; i++)
3357 nvme_validate_ns(ctrl, i);
3359 nvme_remove_invalid_namespaces(ctrl, nn);
3362 static void nvme_clear_changed_ns_log(struct nvme_ctrl *ctrl)
3364 size_t log_size = NVME_MAX_CHANGED_NAMESPACES * sizeof(__le32);
3368 log = kzalloc(log_size, GFP_KERNEL);
3373 * We need to read the log to clear the AEN, but we don't want to rely
3374 * on it for the changed namespace information as userspace could have
3375 * raced with us in reading the log page, which could cause us to miss
3378 error = nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_CHANGED_NS, 0, log,
3381 dev_warn(ctrl->device,
3382 "reading changed ns log failed: %d\n", error);
3387 static void nvme_scan_work(struct work_struct *work)
3389 struct nvme_ctrl *ctrl =
3390 container_of(work, struct nvme_ctrl, scan_work);
3391 struct nvme_id_ctrl *id;
3394 if (ctrl->state != NVME_CTRL_LIVE)
3397 WARN_ON_ONCE(!ctrl->tagset);
3399 if (test_and_clear_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events)) {
3400 dev_info(ctrl->device, "rescanning namespaces.\n");
3401 nvme_clear_changed_ns_log(ctrl);
3404 if (nvme_identify_ctrl(ctrl, &id))
3407 mutex_lock(&ctrl->scan_lock);
3408 nn = le32_to_cpu(id->nn);
3409 if (ctrl->vs >= NVME_VS(1, 1, 0) &&
3410 !(ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)) {
3411 if (!nvme_scan_ns_list(ctrl, nn))
3414 nvme_scan_ns_sequential(ctrl, nn);
3416 mutex_unlock(&ctrl->scan_lock);
3418 down_write(&ctrl->namespaces_rwsem);
3419 list_sort(NULL, &ctrl->namespaces, ns_cmp);
3420 up_write(&ctrl->namespaces_rwsem);
3424 * This function iterates the namespace list unlocked to allow recovery from
3425 * controller failure. It is up to the caller to ensure the namespace list is
3426 * not modified by scan work while this function is executing.
3428 void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
3430 struct nvme_ns *ns, *next;
3433 /* prevent racing with ns scanning */
3434 flush_work(&ctrl->scan_work);
3437 * The dead states indicates the controller was not gracefully
3438 * disconnected. In that case, we won't be able to flush any data while
3439 * removing the namespaces' disks; fail all the queues now to avoid
3440 * potentially having to clean up the failed sync later.
3442 if (ctrl->state == NVME_CTRL_DEAD)
3443 nvme_kill_queues(ctrl);
3445 down_write(&ctrl->namespaces_rwsem);
3446 list_splice_init(&ctrl->namespaces, &ns_list);
3447 up_write(&ctrl->namespaces_rwsem);
3449 list_for_each_entry_safe(ns, next, &ns_list, list)
3452 EXPORT_SYMBOL_GPL(nvme_remove_namespaces);
3454 static void nvme_aen_uevent(struct nvme_ctrl *ctrl)
3456 char *envp[2] = { NULL, NULL };
3457 u32 aen_result = ctrl->aen_result;
3459 ctrl->aen_result = 0;
3463 envp[0] = kasprintf(GFP_KERNEL, "NVME_AEN=%#08x", aen_result);
3466 kobject_uevent_env(&ctrl->device->kobj, KOBJ_CHANGE, envp);
3470 static void nvme_async_event_work(struct work_struct *work)
3472 struct nvme_ctrl *ctrl =
3473 container_of(work, struct nvme_ctrl, async_event_work);
3475 nvme_aen_uevent(ctrl);
3476 ctrl->ops->submit_async_event(ctrl);
3479 static bool nvme_ctrl_pp_status(struct nvme_ctrl *ctrl)
3484 if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts))
3490 return ((ctrl->ctrl_config & NVME_CC_ENABLE) && (csts & NVME_CSTS_PP));
3493 static void nvme_get_fw_slot_info(struct nvme_ctrl *ctrl)
3495 struct nvme_fw_slot_info_log *log;
3497 log = kmalloc(sizeof(*log), GFP_KERNEL);
3501 if (nvme_get_log(ctrl, NVME_NSID_ALL, 0, NVME_LOG_FW_SLOT, log,
3503 dev_warn(ctrl->device, "Get FW SLOT INFO log error\n");
3507 static void nvme_fw_act_work(struct work_struct *work)
3509 struct nvme_ctrl *ctrl = container_of(work,
3510 struct nvme_ctrl, fw_act_work);
3511 unsigned long fw_act_timeout;
3514 fw_act_timeout = jiffies +
3515 msecs_to_jiffies(ctrl->mtfa * 100);
3517 fw_act_timeout = jiffies +
3518 msecs_to_jiffies(admin_timeout * 1000);
3520 nvme_stop_queues(ctrl);
3521 while (nvme_ctrl_pp_status(ctrl)) {
3522 if (time_after(jiffies, fw_act_timeout)) {
3523 dev_warn(ctrl->device,
3524 "Fw activation timeout, reset controller\n");
3525 nvme_reset_ctrl(ctrl);
3531 if (ctrl->state != NVME_CTRL_LIVE)
3534 nvme_start_queues(ctrl);
3535 /* read FW slot information to clear the AER */
3536 nvme_get_fw_slot_info(ctrl);
3539 static void nvme_handle_aen_notice(struct nvme_ctrl *ctrl, u32 result)
3541 u32 aer_notice_type = (result & 0xff00) >> 8;
3543 switch (aer_notice_type) {
3544 case NVME_AER_NOTICE_NS_CHANGED:
3545 trace_nvme_async_event(ctrl, aer_notice_type);
3546 set_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events);
3547 nvme_queue_scan(ctrl);
3549 case NVME_AER_NOTICE_FW_ACT_STARTING:
3550 trace_nvme_async_event(ctrl, aer_notice_type);
3551 queue_work(nvme_wq, &ctrl->fw_act_work);
3553 #ifdef CONFIG_NVME_MULTIPATH
3554 case NVME_AER_NOTICE_ANA:
3555 trace_nvme_async_event(ctrl, aer_notice_type);
3556 if (!ctrl->ana_log_buf)
3558 queue_work(nvme_wq, &ctrl->ana_work);
3562 dev_warn(ctrl->device, "async event result %08x\n", result);
3566 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
3567 volatile union nvme_result *res)
3569 u32 result = le32_to_cpu(res->u32);
3570 u32 aer_type = result & 0x07;
3572 if (le16_to_cpu(status) >> 1 != NVME_SC_SUCCESS)
3576 case NVME_AER_NOTICE:
3577 nvme_handle_aen_notice(ctrl, result);
3579 case NVME_AER_ERROR:
3580 case NVME_AER_SMART:
3583 trace_nvme_async_event(ctrl, aer_type);
3584 ctrl->aen_result = result;
3589 queue_work(nvme_wq, &ctrl->async_event_work);
3591 EXPORT_SYMBOL_GPL(nvme_complete_async_event);
3593 void nvme_stop_ctrl(struct nvme_ctrl *ctrl)
3595 nvme_mpath_stop(ctrl);
3596 nvme_stop_keep_alive(ctrl);
3597 flush_work(&ctrl->async_event_work);
3598 cancel_work_sync(&ctrl->fw_act_work);
3599 if (ctrl->ops->stop_ctrl)
3600 ctrl->ops->stop_ctrl(ctrl);
3602 EXPORT_SYMBOL_GPL(nvme_stop_ctrl);
3604 void nvme_start_ctrl(struct nvme_ctrl *ctrl)
3607 nvme_start_keep_alive(ctrl);
3609 if (ctrl->queue_count > 1) {
3610 nvme_queue_scan(ctrl);
3611 nvme_enable_aen(ctrl);
3612 queue_work(nvme_wq, &ctrl->async_event_work);
3613 nvme_start_queues(ctrl);
3616 EXPORT_SYMBOL_GPL(nvme_start_ctrl);
3618 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl)
3620 cdev_device_del(&ctrl->cdev, ctrl->device);
3622 EXPORT_SYMBOL_GPL(nvme_uninit_ctrl);
3624 static void nvme_free_ctrl(struct device *dev)
3626 struct nvme_ctrl *ctrl =
3627 container_of(dev, struct nvme_ctrl, ctrl_device);
3628 struct nvme_subsystem *subsys = ctrl->subsys;
3630 ida_simple_remove(&nvme_instance_ida, ctrl->instance);
3631 kfree(ctrl->effects);
3632 nvme_mpath_uninit(ctrl);
3633 __free_page(ctrl->discard_page);
3636 mutex_lock(&subsys->lock);
3637 list_del(&ctrl->subsys_entry);
3638 mutex_unlock(&subsys->lock);
3639 sysfs_remove_link(&subsys->dev.kobj, dev_name(ctrl->device));
3642 ctrl->ops->free_ctrl(ctrl);
3645 nvme_put_subsystem(subsys);
3649 * Initialize a NVMe controller structures. This needs to be called during
3650 * earliest initialization so that we have the initialized structured around
3653 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
3654 const struct nvme_ctrl_ops *ops, unsigned long quirks)
3658 ctrl->state = NVME_CTRL_NEW;
3659 spin_lock_init(&ctrl->lock);
3660 mutex_init(&ctrl->scan_lock);
3661 INIT_LIST_HEAD(&ctrl->namespaces);
3662 init_rwsem(&ctrl->namespaces_rwsem);
3665 ctrl->quirks = quirks;
3666 INIT_WORK(&ctrl->scan_work, nvme_scan_work);
3667 INIT_WORK(&ctrl->async_event_work, nvme_async_event_work);
3668 INIT_WORK(&ctrl->fw_act_work, nvme_fw_act_work);
3669 INIT_WORK(&ctrl->delete_work, nvme_delete_ctrl_work);
3671 INIT_DELAYED_WORK(&ctrl->ka_work, nvme_keep_alive_work);
3672 memset(&ctrl->ka_cmd, 0, sizeof(ctrl->ka_cmd));
3673 ctrl->ka_cmd.common.opcode = nvme_admin_keep_alive;
3675 BUILD_BUG_ON(NVME_DSM_MAX_RANGES * sizeof(struct nvme_dsm_range) >
3677 ctrl->discard_page = alloc_page(GFP_KERNEL);
3678 if (!ctrl->discard_page) {
3683 ret = ida_simple_get(&nvme_instance_ida, 0, 0, GFP_KERNEL);
3686 ctrl->instance = ret;
3688 device_initialize(&ctrl->ctrl_device);
3689 ctrl->device = &ctrl->ctrl_device;
3690 ctrl->device->devt = MKDEV(MAJOR(nvme_chr_devt), ctrl->instance);
3691 ctrl->device->class = nvme_class;
3692 ctrl->device->parent = ctrl->dev;
3693 ctrl->device->groups = nvme_dev_attr_groups;
3694 ctrl->device->release = nvme_free_ctrl;
3695 dev_set_drvdata(ctrl->device, ctrl);
3696 ret = dev_set_name(ctrl->device, "nvme%d", ctrl->instance);
3698 goto out_release_instance;
3700 cdev_init(&ctrl->cdev, &nvme_dev_fops);
3701 ctrl->cdev.owner = ops->module;
3702 ret = cdev_device_add(&ctrl->cdev, ctrl->device);
3707 * Initialize latency tolerance controls. The sysfs files won't
3708 * be visible to userspace unless the device actually supports APST.
3710 ctrl->device->power.set_latency_tolerance = nvme_set_latency_tolerance;
3711 dev_pm_qos_update_user_latency_tolerance(ctrl->device,
3712 min(default_ps_max_latency_us, (unsigned long)S32_MAX));
3716 kfree_const(ctrl->device->kobj.name);
3717 out_release_instance:
3718 ida_simple_remove(&nvme_instance_ida, ctrl->instance);
3720 if (ctrl->discard_page)
3721 __free_page(ctrl->discard_page);
3724 EXPORT_SYMBOL_GPL(nvme_init_ctrl);
3727 * nvme_kill_queues(): Ends all namespace queues
3728 * @ctrl: the dead controller that needs to end
3730 * Call this function when the driver determines it is unable to get the
3731 * controller in a state capable of servicing IO.
3733 void nvme_kill_queues(struct nvme_ctrl *ctrl)
3737 down_read(&ctrl->namespaces_rwsem);
3739 /* Forcibly unquiesce queues to avoid blocking dispatch */
3740 if (ctrl->admin_q && !blk_queue_dying(ctrl->admin_q))
3741 blk_mq_unquiesce_queue(ctrl->admin_q);
3743 list_for_each_entry(ns, &ctrl->namespaces, list)
3744 nvme_set_queue_dying(ns);
3746 up_read(&ctrl->namespaces_rwsem);
3748 EXPORT_SYMBOL_GPL(nvme_kill_queues);
3750 void nvme_unfreeze(struct nvme_ctrl *ctrl)
3754 down_read(&ctrl->namespaces_rwsem);
3755 list_for_each_entry(ns, &ctrl->namespaces, list)
3756 blk_mq_unfreeze_queue(ns->queue);
3757 up_read(&ctrl->namespaces_rwsem);
3759 EXPORT_SYMBOL_GPL(nvme_unfreeze);
3761 void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout)
3765 down_read(&ctrl->namespaces_rwsem);
3766 list_for_each_entry(ns, &ctrl->namespaces, list) {
3767 timeout = blk_mq_freeze_queue_wait_timeout(ns->queue, timeout);
3771 up_read(&ctrl->namespaces_rwsem);
3773 EXPORT_SYMBOL_GPL(nvme_wait_freeze_timeout);
3775 void nvme_wait_freeze(struct nvme_ctrl *ctrl)
3779 down_read(&ctrl->namespaces_rwsem);
3780 list_for_each_entry(ns, &ctrl->namespaces, list)
3781 blk_mq_freeze_queue_wait(ns->queue);
3782 up_read(&ctrl->namespaces_rwsem);
3784 EXPORT_SYMBOL_GPL(nvme_wait_freeze);
3786 void nvme_start_freeze(struct nvme_ctrl *ctrl)
3790 down_read(&ctrl->namespaces_rwsem);
3791 list_for_each_entry(ns, &ctrl->namespaces, list)
3792 blk_freeze_queue_start(ns->queue);
3793 up_read(&ctrl->namespaces_rwsem);
3795 EXPORT_SYMBOL_GPL(nvme_start_freeze);
3797 void nvme_stop_queues(struct nvme_ctrl *ctrl)
3801 down_read(&ctrl->namespaces_rwsem);
3802 list_for_each_entry(ns, &ctrl->namespaces, list)
3803 blk_mq_quiesce_queue(ns->queue);
3804 up_read(&ctrl->namespaces_rwsem);
3806 EXPORT_SYMBOL_GPL(nvme_stop_queues);
3808 void nvme_start_queues(struct nvme_ctrl *ctrl)
3812 down_read(&ctrl->namespaces_rwsem);
3813 list_for_each_entry(ns, &ctrl->namespaces, list)
3814 blk_mq_unquiesce_queue(ns->queue);
3815 up_read(&ctrl->namespaces_rwsem);
3817 EXPORT_SYMBOL_GPL(nvme_start_queues);
3819 int __init nvme_core_init(void)
3821 int result = -ENOMEM;
3823 nvme_wq = alloc_workqueue("nvme-wq",
3824 WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
3828 nvme_reset_wq = alloc_workqueue("nvme-reset-wq",
3829 WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
3833 nvme_delete_wq = alloc_workqueue("nvme-delete-wq",
3834 WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
3835 if (!nvme_delete_wq)
3836 goto destroy_reset_wq;
3838 result = alloc_chrdev_region(&nvme_chr_devt, 0, NVME_MINORS, "nvme");
3840 goto destroy_delete_wq;
3842 nvme_class = class_create(THIS_MODULE, "nvme");
3843 if (IS_ERR(nvme_class)) {
3844 result = PTR_ERR(nvme_class);
3845 goto unregister_chrdev;
3848 nvme_subsys_class = class_create(THIS_MODULE, "nvme-subsystem");
3849 if (IS_ERR(nvme_subsys_class)) {
3850 result = PTR_ERR(nvme_subsys_class);
3856 class_destroy(nvme_class);
3858 unregister_chrdev_region(nvme_chr_devt, NVME_MINORS);
3860 destroy_workqueue(nvme_delete_wq);
3862 destroy_workqueue(nvme_reset_wq);
3864 destroy_workqueue(nvme_wq);
3869 void __exit nvme_core_exit(void)
3871 ida_destroy(&nvme_subsystems_ida);
3872 class_destroy(nvme_subsys_class);
3873 class_destroy(nvme_class);
3874 unregister_chrdev_region(nvme_chr_devt, NVME_MINORS);
3875 destroy_workqueue(nvme_delete_wq);
3876 destroy_workqueue(nvme_reset_wq);
3877 destroy_workqueue(nvme_wq);
3880 MODULE_LICENSE("GPL");
3881 MODULE_VERSION("1.0");
3882 module_init(nvme_core_init);
3883 module_exit(nvme_core_exit);