1 // SPDX-License-Identifier: GPL-2.0
3 * NVM Express device driver
4 * Copyright (c) 2011-2014, Intel Corporation.
7 #include <linux/blkdev.h>
8 #include <linux/blk-mq.h>
9 #include <linux/delay.h>
10 #include <linux/errno.h>
11 #include <linux/hdreg.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/backing-dev.h>
15 #include <linux/list_sort.h>
16 #include <linux/slab.h>
17 #include <linux/types.h>
19 #include <linux/ptrace.h>
20 #include <linux/nvme_ioctl.h>
21 #include <linux/t10-pi.h>
22 #include <linux/pm_qos.h>
23 #include <asm/unaligned.h>
28 #define CREATE_TRACE_POINTS
31 #define NVME_MINORS (1U << MINORBITS)
33 unsigned int admin_timeout = 60;
34 module_param(admin_timeout, uint, 0644);
35 MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands");
36 EXPORT_SYMBOL_GPL(admin_timeout);
38 unsigned int nvme_io_timeout = 30;
39 module_param_named(io_timeout, nvme_io_timeout, uint, 0644);
40 MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O");
41 EXPORT_SYMBOL_GPL(nvme_io_timeout);
43 static unsigned char shutdown_timeout = 5;
44 module_param(shutdown_timeout, byte, 0644);
45 MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown");
47 static u8 nvme_max_retries = 5;
48 module_param_named(max_retries, nvme_max_retries, byte, 0644);
49 MODULE_PARM_DESC(max_retries, "max number of retries a command may have");
51 static unsigned long default_ps_max_latency_us = 100000;
52 module_param(default_ps_max_latency_us, ulong, 0644);
53 MODULE_PARM_DESC(default_ps_max_latency_us,
54 "max power saving latency for new devices; use PM QOS to change per device");
56 static bool force_apst;
57 module_param(force_apst, bool, 0644);
58 MODULE_PARM_DESC(force_apst, "allow APST for newly enumerated devices even if quirked off");
61 module_param(streams, bool, 0644);
62 MODULE_PARM_DESC(streams, "turn on support for Streams write directives");
65 * nvme_wq - hosts nvme related works that are not reset or delete
66 * nvme_reset_wq - hosts nvme reset works
67 * nvme_delete_wq - hosts nvme delete works
69 * nvme_wq will host works such are scan, aen handling, fw activation,
70 * keep-alive error recovery, periodic reconnects etc. nvme_reset_wq
71 * runs reset works which also flush works hosted on nvme_wq for
72 * serialization purposes. nvme_delete_wq host controller deletion
73 * works which flush reset works for serialization.
75 struct workqueue_struct *nvme_wq;
76 EXPORT_SYMBOL_GPL(nvme_wq);
78 struct workqueue_struct *nvme_reset_wq;
79 EXPORT_SYMBOL_GPL(nvme_reset_wq);
81 struct workqueue_struct *nvme_delete_wq;
82 EXPORT_SYMBOL_GPL(nvme_delete_wq);
84 static DEFINE_IDA(nvme_subsystems_ida);
85 static LIST_HEAD(nvme_subsystems);
86 static DEFINE_MUTEX(nvme_subsystems_lock);
88 static DEFINE_IDA(nvme_instance_ida);
89 static dev_t nvme_chr_devt;
90 static struct class *nvme_class;
91 static struct class *nvme_subsys_class;
93 static int nvme_revalidate_disk(struct gendisk *disk);
94 static void nvme_put_subsystem(struct nvme_subsystem *subsys);
95 static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl,
98 static void nvme_set_queue_dying(struct nvme_ns *ns)
101 * Revalidating a dead namespace sets capacity to 0. This will end
102 * buffered writers dirtying pages that can't be synced.
104 if (!ns->disk || test_and_set_bit(NVME_NS_DEAD, &ns->flags))
106 revalidate_disk(ns->disk);
107 blk_set_queue_dying(ns->queue);
108 /* Forcibly unquiesce queues to avoid blocking dispatch */
109 blk_mq_unquiesce_queue(ns->queue);
112 static void nvme_queue_scan(struct nvme_ctrl *ctrl)
115 * Only new queue scan work when admin and IO queues are both alive
117 if (ctrl->state == NVME_CTRL_LIVE)
118 queue_work(nvme_wq, &ctrl->scan_work);
121 int nvme_reset_ctrl(struct nvme_ctrl *ctrl)
123 if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING))
125 if (!queue_work(nvme_reset_wq, &ctrl->reset_work))
129 EXPORT_SYMBOL_GPL(nvme_reset_ctrl);
131 int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl)
135 ret = nvme_reset_ctrl(ctrl);
137 flush_work(&ctrl->reset_work);
138 if (ctrl->state != NVME_CTRL_LIVE &&
139 ctrl->state != NVME_CTRL_ADMIN_ONLY)
145 EXPORT_SYMBOL_GPL(nvme_reset_ctrl_sync);
147 static void nvme_do_delete_ctrl(struct nvme_ctrl *ctrl)
149 dev_info(ctrl->device,
150 "Removing ctrl: NQN \"%s\"\n", ctrl->opts->subsysnqn);
152 flush_work(&ctrl->reset_work);
153 nvme_stop_ctrl(ctrl);
154 nvme_remove_namespaces(ctrl);
155 ctrl->ops->delete_ctrl(ctrl);
156 nvme_uninit_ctrl(ctrl);
160 static void nvme_delete_ctrl_work(struct work_struct *work)
162 struct nvme_ctrl *ctrl =
163 container_of(work, struct nvme_ctrl, delete_work);
165 nvme_do_delete_ctrl(ctrl);
168 int nvme_delete_ctrl(struct nvme_ctrl *ctrl)
170 if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING))
172 if (!queue_work(nvme_delete_wq, &ctrl->delete_work))
176 EXPORT_SYMBOL_GPL(nvme_delete_ctrl);
178 static int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl)
183 * Keep a reference until nvme_do_delete_ctrl() complete,
184 * since ->delete_ctrl can free the controller.
187 if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING))
190 nvme_do_delete_ctrl(ctrl);
195 static inline bool nvme_ns_has_pi(struct nvme_ns *ns)
197 return ns->pi_type && ns->ms == sizeof(struct t10_pi_tuple);
200 static blk_status_t nvme_error_status(u16 status)
202 switch (status & 0x7ff) {
203 case NVME_SC_SUCCESS:
205 case NVME_SC_CAP_EXCEEDED:
206 return BLK_STS_NOSPC;
207 case NVME_SC_LBA_RANGE:
208 return BLK_STS_TARGET;
209 case NVME_SC_BAD_ATTRIBUTES:
210 case NVME_SC_ONCS_NOT_SUPPORTED:
211 case NVME_SC_INVALID_OPCODE:
212 case NVME_SC_INVALID_FIELD:
213 case NVME_SC_INVALID_NS:
214 return BLK_STS_NOTSUPP;
215 case NVME_SC_WRITE_FAULT:
216 case NVME_SC_READ_ERROR:
217 case NVME_SC_UNWRITTEN_BLOCK:
218 case NVME_SC_ACCESS_DENIED:
219 case NVME_SC_READ_ONLY:
220 case NVME_SC_COMPARE_FAILED:
221 return BLK_STS_MEDIUM;
222 case NVME_SC_GUARD_CHECK:
223 case NVME_SC_APPTAG_CHECK:
224 case NVME_SC_REFTAG_CHECK:
225 case NVME_SC_INVALID_PI:
226 return BLK_STS_PROTECTION;
227 case NVME_SC_RESERVATION_CONFLICT:
228 return BLK_STS_NEXUS;
229 case NVME_SC_HOST_PATH_ERROR:
230 return BLK_STS_TRANSPORT;
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(nvme_req(req)->status);
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)) {
285 nvme_trace_bio_complete(req, status);
286 blk_mq_end_request(req, status);
288 EXPORT_SYMBOL_GPL(nvme_complete_rq);
290 bool nvme_cancel_request(struct request *req, void *data, bool reserved)
292 dev_dbg_ratelimited(((struct nvme_ctrl *) data)->device,
293 "Cancelling I/O %d", req->tag);
295 /* don't abort one completed request */
296 if (blk_mq_request_completed(req))
299 nvme_req(req)->status = NVME_SC_HOST_PATH_ERROR;
300 blk_mq_complete_request(req);
303 EXPORT_SYMBOL_GPL(nvme_cancel_request);
305 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
306 enum nvme_ctrl_state new_state)
308 enum nvme_ctrl_state old_state;
310 bool changed = false;
312 spin_lock_irqsave(&ctrl->lock, flags);
314 old_state = ctrl->state;
316 case NVME_CTRL_ADMIN_ONLY:
318 case NVME_CTRL_CONNECTING:
328 case NVME_CTRL_RESETTING:
329 case NVME_CTRL_CONNECTING:
336 case NVME_CTRL_RESETTING:
340 case NVME_CTRL_ADMIN_ONLY:
347 case NVME_CTRL_CONNECTING:
350 case NVME_CTRL_RESETTING:
357 case NVME_CTRL_DELETING:
360 case NVME_CTRL_ADMIN_ONLY:
361 case NVME_CTRL_RESETTING:
362 case NVME_CTRL_CONNECTING:
371 case NVME_CTRL_DELETING:
383 ctrl->state = new_state;
385 spin_unlock_irqrestore(&ctrl->lock, flags);
386 if (changed && ctrl->state == NVME_CTRL_LIVE)
387 nvme_kick_requeue_lists(ctrl);
390 EXPORT_SYMBOL_GPL(nvme_change_ctrl_state);
392 static void nvme_free_ns_head(struct kref *ref)
394 struct nvme_ns_head *head =
395 container_of(ref, struct nvme_ns_head, ref);
397 nvme_mpath_remove_disk(head);
398 ida_simple_remove(&head->subsys->ns_ida, head->instance);
399 list_del_init(&head->entry);
400 cleanup_srcu_struct(&head->srcu);
401 nvme_put_subsystem(head->subsys);
405 static void nvme_put_ns_head(struct nvme_ns_head *head)
407 kref_put(&head->ref, nvme_free_ns_head);
410 static void nvme_free_ns(struct kref *kref)
412 struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref);
415 nvme_nvm_unregister(ns);
418 nvme_put_ns_head(ns->head);
419 nvme_put_ctrl(ns->ctrl);
423 static void nvme_put_ns(struct nvme_ns *ns)
425 kref_put(&ns->kref, nvme_free_ns);
428 static inline void nvme_clear_nvme_request(struct request *req)
430 if (!(req->rq_flags & RQF_DONTPREP)) {
431 nvme_req(req)->retries = 0;
432 nvme_req(req)->flags = 0;
433 req->rq_flags |= RQF_DONTPREP;
437 struct request *nvme_alloc_request(struct request_queue *q,
438 struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid)
440 unsigned op = nvme_is_write(cmd) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN;
443 if (qid == NVME_QID_ANY) {
444 req = blk_mq_alloc_request(q, op, flags);
446 req = blk_mq_alloc_request_hctx(q, op, flags,
452 req->cmd_flags |= REQ_FAILFAST_DRIVER;
453 nvme_clear_nvme_request(req);
454 nvme_req(req)->cmd = cmd;
458 EXPORT_SYMBOL_GPL(nvme_alloc_request);
460 static int nvme_toggle_streams(struct nvme_ctrl *ctrl, bool enable)
462 struct nvme_command c;
464 memset(&c, 0, sizeof(c));
466 c.directive.opcode = nvme_admin_directive_send;
467 c.directive.nsid = cpu_to_le32(NVME_NSID_ALL);
468 c.directive.doper = NVME_DIR_SND_ID_OP_ENABLE;
469 c.directive.dtype = NVME_DIR_IDENTIFY;
470 c.directive.tdtype = NVME_DIR_STREAMS;
471 c.directive.endir = enable ? NVME_DIR_ENDIR : 0;
473 return nvme_submit_sync_cmd(ctrl->admin_q, &c, NULL, 0);
476 static int nvme_disable_streams(struct nvme_ctrl *ctrl)
478 return nvme_toggle_streams(ctrl, false);
481 static int nvme_enable_streams(struct nvme_ctrl *ctrl)
483 return nvme_toggle_streams(ctrl, true);
486 static int nvme_get_stream_params(struct nvme_ctrl *ctrl,
487 struct streams_directive_params *s, u32 nsid)
489 struct nvme_command c;
491 memset(&c, 0, sizeof(c));
492 memset(s, 0, sizeof(*s));
494 c.directive.opcode = nvme_admin_directive_recv;
495 c.directive.nsid = cpu_to_le32(nsid);
496 c.directive.numd = cpu_to_le32((sizeof(*s) >> 2) - 1);
497 c.directive.doper = NVME_DIR_RCV_ST_OP_PARAM;
498 c.directive.dtype = NVME_DIR_STREAMS;
500 return nvme_submit_sync_cmd(ctrl->admin_q, &c, s, sizeof(*s));
503 static int nvme_configure_directives(struct nvme_ctrl *ctrl)
505 struct streams_directive_params s;
508 if (!(ctrl->oacs & NVME_CTRL_OACS_DIRECTIVES))
513 ret = nvme_enable_streams(ctrl);
517 ret = nvme_get_stream_params(ctrl, &s, NVME_NSID_ALL);
521 ctrl->nssa = le16_to_cpu(s.nssa);
522 if (ctrl->nssa < BLK_MAX_WRITE_HINTS - 1) {
523 dev_info(ctrl->device, "too few streams (%u) available\n",
525 nvme_disable_streams(ctrl);
529 ctrl->nr_streams = min_t(unsigned, ctrl->nssa, BLK_MAX_WRITE_HINTS - 1);
530 dev_info(ctrl->device, "Using %u streams\n", ctrl->nr_streams);
535 * Check if 'req' has a write hint associated with it. If it does, assign
536 * a valid namespace stream to the write.
538 static void nvme_assign_write_stream(struct nvme_ctrl *ctrl,
539 struct request *req, u16 *control,
542 enum rw_hint streamid = req->write_hint;
544 if (streamid == WRITE_LIFE_NOT_SET || streamid == WRITE_LIFE_NONE)
548 if (WARN_ON_ONCE(streamid > ctrl->nr_streams))
551 *control |= NVME_RW_DTYPE_STREAMS;
552 *dsmgmt |= streamid << 16;
555 if (streamid < ARRAY_SIZE(req->q->write_hints))
556 req->q->write_hints[streamid] += blk_rq_bytes(req) >> 9;
559 static inline void nvme_setup_flush(struct nvme_ns *ns,
560 struct nvme_command *cmnd)
562 cmnd->common.opcode = nvme_cmd_flush;
563 cmnd->common.nsid = cpu_to_le32(ns->head->ns_id);
566 static blk_status_t nvme_setup_discard(struct nvme_ns *ns, struct request *req,
567 struct nvme_command *cmnd)
569 unsigned short segments = blk_rq_nr_discard_segments(req), n = 0;
570 struct nvme_dsm_range *range;
573 range = kmalloc_array(segments, sizeof(*range),
574 GFP_ATOMIC | __GFP_NOWARN);
577 * If we fail allocation our range, fallback to the controller
578 * discard page. If that's also busy, it's safe to return
579 * busy, as we know we can make progress once that's freed.
581 if (test_and_set_bit_lock(0, &ns->ctrl->discard_page_busy))
582 return BLK_STS_RESOURCE;
584 range = page_address(ns->ctrl->discard_page);
587 __rq_for_each_bio(bio, req) {
588 u64 slba = nvme_block_nr(ns, bio->bi_iter.bi_sector);
589 u32 nlb = bio->bi_iter.bi_size >> ns->lba_shift;
592 range[n].cattr = cpu_to_le32(0);
593 range[n].nlb = cpu_to_le32(nlb);
594 range[n].slba = cpu_to_le64(slba);
599 if (WARN_ON_ONCE(n != segments)) {
600 if (virt_to_page(range) == ns->ctrl->discard_page)
601 clear_bit_unlock(0, &ns->ctrl->discard_page_busy);
604 return BLK_STS_IOERR;
607 cmnd->dsm.opcode = nvme_cmd_dsm;
608 cmnd->dsm.nsid = cpu_to_le32(ns->head->ns_id);
609 cmnd->dsm.nr = cpu_to_le32(segments - 1);
610 cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
612 req->special_vec.bv_page = virt_to_page(range);
613 req->special_vec.bv_offset = offset_in_page(range);
614 req->special_vec.bv_len = sizeof(*range) * segments;
615 req->rq_flags |= RQF_SPECIAL_PAYLOAD;
620 static inline blk_status_t nvme_setup_write_zeroes(struct nvme_ns *ns,
621 struct request *req, struct nvme_command *cmnd)
623 if (ns->ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
624 return nvme_setup_discard(ns, req, cmnd);
626 cmnd->write_zeroes.opcode = nvme_cmd_write_zeroes;
627 cmnd->write_zeroes.nsid = cpu_to_le32(ns->head->ns_id);
628 cmnd->write_zeroes.slba =
629 cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
630 cmnd->write_zeroes.length =
631 cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
632 cmnd->write_zeroes.control = 0;
636 static inline blk_status_t nvme_setup_rw(struct nvme_ns *ns,
637 struct request *req, struct nvme_command *cmnd)
639 struct nvme_ctrl *ctrl = ns->ctrl;
643 if (req->cmd_flags & REQ_FUA)
644 control |= NVME_RW_FUA;
645 if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD))
646 control |= NVME_RW_LR;
648 if (req->cmd_flags & REQ_RAHEAD)
649 dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;
651 cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read);
652 cmnd->rw.nsid = cpu_to_le32(ns->head->ns_id);
653 cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
654 cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
656 if (req_op(req) == REQ_OP_WRITE && ctrl->nr_streams)
657 nvme_assign_write_stream(ctrl, req, &control, &dsmgmt);
661 * If formated with metadata, the block layer always provides a
662 * metadata buffer if CONFIG_BLK_DEV_INTEGRITY is enabled. Else
663 * we enable the PRACT bit for protection information or set the
664 * namespace capacity to zero to prevent any I/O.
666 if (!blk_integrity_rq(req)) {
667 if (WARN_ON_ONCE(!nvme_ns_has_pi(ns)))
668 return BLK_STS_NOTSUPP;
669 control |= NVME_RW_PRINFO_PRACT;
670 } else if (req_op(req) == REQ_OP_WRITE) {
671 t10_pi_prepare(req, ns->pi_type);
674 switch (ns->pi_type) {
675 case NVME_NS_DPS_PI_TYPE3:
676 control |= NVME_RW_PRINFO_PRCHK_GUARD;
678 case NVME_NS_DPS_PI_TYPE1:
679 case NVME_NS_DPS_PI_TYPE2:
680 control |= NVME_RW_PRINFO_PRCHK_GUARD |
681 NVME_RW_PRINFO_PRCHK_REF;
682 cmnd->rw.reftag = cpu_to_le32(t10_pi_ref_tag(req));
687 cmnd->rw.control = cpu_to_le16(control);
688 cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
692 void nvme_cleanup_cmd(struct request *req)
694 if (blk_integrity_rq(req) && req_op(req) == REQ_OP_READ &&
695 nvme_req(req)->status == 0) {
696 struct nvme_ns *ns = req->rq_disk->private_data;
698 t10_pi_complete(req, ns->pi_type,
699 blk_rq_bytes(req) >> ns->lba_shift);
701 if (req->rq_flags & RQF_SPECIAL_PAYLOAD) {
702 struct nvme_ns *ns = req->rq_disk->private_data;
703 struct page *page = req->special_vec.bv_page;
705 if (page == ns->ctrl->discard_page)
706 clear_bit_unlock(0, &ns->ctrl->discard_page_busy);
708 kfree(page_address(page) + req->special_vec.bv_offset);
711 EXPORT_SYMBOL_GPL(nvme_cleanup_cmd);
713 blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
714 struct nvme_command *cmd)
716 blk_status_t ret = BLK_STS_OK;
718 nvme_clear_nvme_request(req);
720 memset(cmd, 0, sizeof(*cmd));
721 switch (req_op(req)) {
724 memcpy(cmd, nvme_req(req)->cmd, sizeof(*cmd));
727 nvme_setup_flush(ns, cmd);
729 case REQ_OP_WRITE_ZEROES:
730 ret = nvme_setup_write_zeroes(ns, req, cmd);
733 ret = nvme_setup_discard(ns, req, cmd);
737 ret = nvme_setup_rw(ns, req, cmd);
741 return BLK_STS_IOERR;
744 cmd->common.command_id = req->tag;
745 trace_nvme_setup_cmd(req, cmd);
748 EXPORT_SYMBOL_GPL(nvme_setup_cmd);
750 static void nvme_end_sync_rq(struct request *rq, blk_status_t error)
752 struct completion *waiting = rq->end_io_data;
754 rq->end_io_data = NULL;
758 static void nvme_execute_rq_polled(struct request_queue *q,
759 struct gendisk *bd_disk, struct request *rq, int at_head)
761 DECLARE_COMPLETION_ONSTACK(wait);
763 WARN_ON_ONCE(!test_bit(QUEUE_FLAG_POLL, &q->queue_flags));
765 rq->cmd_flags |= REQ_HIPRI;
766 rq->end_io_data = &wait;
767 blk_execute_rq_nowait(q, bd_disk, rq, at_head, nvme_end_sync_rq);
769 while (!completion_done(&wait)) {
770 blk_poll(q, request_to_qc_t(rq->mq_hctx, rq), true);
776 * Returns 0 on success. If the result is negative, it's a Linux error code;
777 * if the result is positive, it's an NVM Express status code
779 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
780 union nvme_result *result, void *buffer, unsigned bufflen,
781 unsigned timeout, int qid, int at_head,
782 blk_mq_req_flags_t flags, bool poll)
787 req = nvme_alloc_request(q, cmd, flags, qid);
791 req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
793 if (buffer && bufflen) {
794 ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL);
800 nvme_execute_rq_polled(req->q, NULL, req, at_head);
802 blk_execute_rq(req->q, NULL, req, at_head);
804 *result = nvme_req(req)->result;
805 if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
808 ret = nvme_req(req)->status;
810 blk_mq_free_request(req);
813 EXPORT_SYMBOL_GPL(__nvme_submit_sync_cmd);
815 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
816 void *buffer, unsigned bufflen)
818 return __nvme_submit_sync_cmd(q, cmd, NULL, buffer, bufflen, 0,
819 NVME_QID_ANY, 0, 0, false);
821 EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd);
823 static void *nvme_add_user_metadata(struct bio *bio, void __user *ubuf,
824 unsigned len, u32 seed, bool write)
826 struct bio_integrity_payload *bip;
830 buf = kmalloc(len, GFP_KERNEL);
835 if (write && copy_from_user(buf, ubuf, len))
838 bip = bio_integrity_alloc(bio, GFP_KERNEL, 1);
844 bip->bip_iter.bi_size = len;
845 bip->bip_iter.bi_sector = seed;
846 ret = bio_integrity_add_page(bio, virt_to_page(buf), len,
847 offset_in_page(buf));
857 static int nvme_submit_user_cmd(struct request_queue *q,
858 struct nvme_command *cmd, void __user *ubuffer,
859 unsigned bufflen, void __user *meta_buffer, unsigned meta_len,
860 u32 meta_seed, u32 *result, unsigned timeout)
862 bool write = nvme_is_write(cmd);
863 struct nvme_ns *ns = q->queuedata;
864 struct gendisk *disk = ns ? ns->disk : NULL;
866 struct bio *bio = NULL;
870 req = nvme_alloc_request(q, cmd, 0, NVME_QID_ANY);
874 req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
875 nvme_req(req)->flags |= NVME_REQ_USERCMD;
877 if (ubuffer && bufflen) {
878 ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
884 if (disk && meta_buffer && meta_len) {
885 meta = nvme_add_user_metadata(bio, meta_buffer, meta_len,
891 req->cmd_flags |= REQ_INTEGRITY;
895 blk_execute_rq(req->q, disk, req, 0);
896 if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
899 ret = nvme_req(req)->status;
901 *result = le32_to_cpu(nvme_req(req)->result.u32);
902 if (meta && !ret && !write) {
903 if (copy_to_user(meta_buffer, meta, meta_len))
909 blk_rq_unmap_user(bio);
911 blk_mq_free_request(req);
915 static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status)
917 struct nvme_ctrl *ctrl = rq->end_io_data;
919 bool startka = false;
921 blk_mq_free_request(rq);
924 dev_err(ctrl->device,
925 "failed nvme_keep_alive_end_io error=%d\n",
930 ctrl->comp_seen = false;
931 spin_lock_irqsave(&ctrl->lock, flags);
932 if (ctrl->state == NVME_CTRL_LIVE ||
933 ctrl->state == NVME_CTRL_CONNECTING)
935 spin_unlock_irqrestore(&ctrl->lock, flags);
937 schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
940 static int nvme_keep_alive(struct nvme_ctrl *ctrl)
944 rq = nvme_alloc_request(ctrl->admin_q, &ctrl->ka_cmd, BLK_MQ_REQ_RESERVED,
949 rq->timeout = ctrl->kato * HZ;
950 rq->end_io_data = ctrl;
952 blk_execute_rq_nowait(rq->q, NULL, rq, 0, nvme_keep_alive_end_io);
957 static void nvme_keep_alive_work(struct work_struct *work)
959 struct nvme_ctrl *ctrl = container_of(to_delayed_work(work),
960 struct nvme_ctrl, ka_work);
961 bool comp_seen = ctrl->comp_seen;
963 if ((ctrl->ctratt & NVME_CTRL_ATTR_TBKAS) && comp_seen) {
964 dev_dbg(ctrl->device,
965 "reschedule traffic based keep-alive timer\n");
966 ctrl->comp_seen = false;
967 schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
971 if (nvme_keep_alive(ctrl)) {
972 /* allocation failure, reset the controller */
973 dev_err(ctrl->device, "keep-alive failed\n");
974 nvme_reset_ctrl(ctrl);
979 static void nvme_start_keep_alive(struct nvme_ctrl *ctrl)
981 if (unlikely(ctrl->kato == 0))
984 schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
987 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl)
989 if (unlikely(ctrl->kato == 0))
992 cancel_delayed_work_sync(&ctrl->ka_work);
994 EXPORT_SYMBOL_GPL(nvme_stop_keep_alive);
996 static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
998 struct nvme_command c = { };
1001 /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
1002 c.identify.opcode = nvme_admin_identify;
1003 c.identify.cns = NVME_ID_CNS_CTRL;
1005 *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL);
1009 error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
1010 sizeof(struct nvme_id_ctrl));
1016 static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
1017 struct nvme_ns_ids *ids)
1019 struct nvme_command c = { };
1025 c.identify.opcode = nvme_admin_identify;
1026 c.identify.nsid = cpu_to_le32(nsid);
1027 c.identify.cns = NVME_ID_CNS_NS_DESC_LIST;
1029 data = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL);
1033 status = nvme_submit_sync_cmd(ctrl->admin_q, &c, data,
1034 NVME_IDENTIFY_DATA_SIZE);
1038 for (pos = 0; pos < NVME_IDENTIFY_DATA_SIZE; pos += len) {
1039 struct nvme_ns_id_desc *cur = data + pos;
1044 switch (cur->nidt) {
1045 case NVME_NIDT_EUI64:
1046 if (cur->nidl != NVME_NIDT_EUI64_LEN) {
1047 dev_warn(ctrl->device,
1048 "ctrl returned bogus length: %d for NVME_NIDT_EUI64\n",
1052 len = NVME_NIDT_EUI64_LEN;
1053 memcpy(ids->eui64, data + pos + sizeof(*cur), len);
1055 case NVME_NIDT_NGUID:
1056 if (cur->nidl != NVME_NIDT_NGUID_LEN) {
1057 dev_warn(ctrl->device,
1058 "ctrl returned bogus length: %d for NVME_NIDT_NGUID\n",
1062 len = NVME_NIDT_NGUID_LEN;
1063 memcpy(ids->nguid, data + pos + sizeof(*cur), len);
1065 case NVME_NIDT_UUID:
1066 if (cur->nidl != NVME_NIDT_UUID_LEN) {
1067 dev_warn(ctrl->device,
1068 "ctrl returned bogus length: %d for NVME_NIDT_UUID\n",
1072 len = NVME_NIDT_UUID_LEN;
1073 uuid_copy(&ids->uuid, data + pos + sizeof(*cur));
1076 /* Skip unknown types */
1081 len += sizeof(*cur);
1088 static int nvme_identify_ns_list(struct nvme_ctrl *dev, unsigned nsid, __le32 *ns_list)
1090 struct nvme_command c = { };
1092 c.identify.opcode = nvme_admin_identify;
1093 c.identify.cns = NVME_ID_CNS_NS_ACTIVE_LIST;
1094 c.identify.nsid = cpu_to_le32(nsid);
1095 return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list,
1096 NVME_IDENTIFY_DATA_SIZE);
1099 static int nvme_identify_ns(struct nvme_ctrl *ctrl,
1100 unsigned nsid, struct nvme_id_ns **id)
1102 struct nvme_command c = { };
1105 /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
1106 c.identify.opcode = nvme_admin_identify;
1107 c.identify.nsid = cpu_to_le32(nsid);
1108 c.identify.cns = NVME_ID_CNS_NS;
1110 *id = kmalloc(sizeof(**id), GFP_KERNEL);
1114 error = nvme_submit_sync_cmd(ctrl->admin_q, &c, *id, sizeof(**id));
1116 dev_warn(ctrl->device, "Identify namespace failed (%d)\n", error);
1123 static int nvme_features(struct nvme_ctrl *dev, u8 op, unsigned int fid,
1124 unsigned int dword11, void *buffer, size_t buflen, u32 *result)
1126 struct nvme_command c;
1127 union nvme_result res;
1130 memset(&c, 0, sizeof(c));
1131 c.features.opcode = op;
1132 c.features.fid = cpu_to_le32(fid);
1133 c.features.dword11 = cpu_to_le32(dword11);
1135 ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &res,
1136 buffer, buflen, 0, NVME_QID_ANY, 0, 0, false);
1137 if (ret >= 0 && result)
1138 *result = le32_to_cpu(res.u32);
1142 int nvme_set_features(struct nvme_ctrl *dev, unsigned int fid,
1143 unsigned int dword11, void *buffer, size_t buflen,
1146 return nvme_features(dev, nvme_admin_set_features, fid, dword11, buffer,
1149 EXPORT_SYMBOL_GPL(nvme_set_features);
1151 int nvme_get_features(struct nvme_ctrl *dev, unsigned int fid,
1152 unsigned int dword11, void *buffer, size_t buflen,
1155 return nvme_features(dev, nvme_admin_get_features, fid, dword11, buffer,
1158 EXPORT_SYMBOL_GPL(nvme_get_features);
1160 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count)
1162 u32 q_count = (*count - 1) | ((*count - 1) << 16);
1164 int status, nr_io_queues;
1166 status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, NULL, 0,
1172 * Degraded controllers might return an error when setting the queue
1173 * count. We still want to be able to bring them online and offer
1174 * access to the admin queue, as that might be only way to fix them up.
1177 dev_err(ctrl->device, "Could not set queue count (%d)\n", status);
1180 nr_io_queues = min(result & 0xffff, result >> 16) + 1;
1181 *count = min(*count, nr_io_queues);
1186 EXPORT_SYMBOL_GPL(nvme_set_queue_count);
1188 #define NVME_AEN_SUPPORTED \
1189 (NVME_AEN_CFG_NS_ATTR | NVME_AEN_CFG_FW_ACT | NVME_AEN_CFG_ANA_CHANGE)
1191 static void nvme_enable_aen(struct nvme_ctrl *ctrl)
1193 u32 result, supported_aens = ctrl->oaes & NVME_AEN_SUPPORTED;
1196 if (!supported_aens)
1199 status = nvme_set_features(ctrl, NVME_FEAT_ASYNC_EVENT, supported_aens,
1202 dev_warn(ctrl->device, "Failed to configure AEN (cfg %x)\n",
1206 static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
1208 struct nvme_user_io io;
1209 struct nvme_command c;
1210 unsigned length, meta_len;
1211 void __user *metadata;
1213 if (copy_from_user(&io, uio, sizeof(io)))
1218 switch (io.opcode) {
1219 case nvme_cmd_write:
1221 case nvme_cmd_compare:
1227 length = (io.nblocks + 1) << ns->lba_shift;
1228 meta_len = (io.nblocks + 1) * ns->ms;
1229 metadata = (void __user *)(uintptr_t)io.metadata;
1234 } else if (meta_len) {
1235 if ((io.metadata & 3) || !io.metadata)
1239 memset(&c, 0, sizeof(c));
1240 c.rw.opcode = io.opcode;
1241 c.rw.flags = io.flags;
1242 c.rw.nsid = cpu_to_le32(ns->head->ns_id);
1243 c.rw.slba = cpu_to_le64(io.slba);
1244 c.rw.length = cpu_to_le16(io.nblocks);
1245 c.rw.control = cpu_to_le16(io.control);
1246 c.rw.dsmgmt = cpu_to_le32(io.dsmgmt);
1247 c.rw.reftag = cpu_to_le32(io.reftag);
1248 c.rw.apptag = cpu_to_le16(io.apptag);
1249 c.rw.appmask = cpu_to_le16(io.appmask);
1251 return nvme_submit_user_cmd(ns->queue, &c,
1252 (void __user *)(uintptr_t)io.addr, length,
1253 metadata, meta_len, lower_32_bits(io.slba), NULL, 0);
1256 static u32 nvme_known_admin_effects(u8 opcode)
1259 case nvme_admin_format_nvm:
1260 return NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC |
1261 NVME_CMD_EFFECTS_CSE_MASK;
1262 case nvme_admin_sanitize_nvm:
1263 return NVME_CMD_EFFECTS_CSE_MASK;
1270 static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
1277 effects = le32_to_cpu(ctrl->effects->iocs[opcode]);
1278 if (effects & ~(NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC))
1279 dev_warn(ctrl->device,
1280 "IO command:%02x has unhandled effects:%08x\n",
1286 effects = le32_to_cpu(ctrl->effects->acs[opcode]);
1287 effects |= nvme_known_admin_effects(opcode);
1290 * For simplicity, IO to all namespaces is quiesced even if the command
1291 * effects say only one namespace is affected.
1293 if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) {
1294 mutex_lock(&ctrl->scan_lock);
1295 nvme_start_freeze(ctrl);
1296 nvme_wait_freeze(ctrl);
1301 static void nvme_update_formats(struct nvme_ctrl *ctrl)
1305 down_read(&ctrl->namespaces_rwsem);
1306 list_for_each_entry(ns, &ctrl->namespaces, list)
1307 if (ns->disk && nvme_revalidate_disk(ns->disk))
1308 nvme_set_queue_dying(ns);
1309 up_read(&ctrl->namespaces_rwsem);
1311 nvme_remove_invalid_namespaces(ctrl, NVME_NSID_ALL);
1314 static void nvme_passthru_end(struct nvme_ctrl *ctrl, u32 effects)
1317 * Revalidate LBA changes prior to unfreezing. This is necessary to
1318 * prevent memory corruption if a logical block size was changed by
1321 if (effects & NVME_CMD_EFFECTS_LBCC)
1322 nvme_update_formats(ctrl);
1323 if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) {
1324 nvme_unfreeze(ctrl);
1325 mutex_unlock(&ctrl->scan_lock);
1327 if (effects & NVME_CMD_EFFECTS_CCC)
1328 nvme_init_identify(ctrl);
1329 if (effects & (NVME_CMD_EFFECTS_NIC | NVME_CMD_EFFECTS_NCC))
1330 nvme_queue_scan(ctrl);
1333 static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
1334 struct nvme_passthru_cmd __user *ucmd)
1336 struct nvme_passthru_cmd cmd;
1337 struct nvme_command c;
1338 unsigned timeout = 0;
1342 if (!capable(CAP_SYS_ADMIN))
1344 if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
1349 memset(&c, 0, sizeof(c));
1350 c.common.opcode = cmd.opcode;
1351 c.common.flags = cmd.flags;
1352 c.common.nsid = cpu_to_le32(cmd.nsid);
1353 c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
1354 c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
1355 c.common.cdw10 = cpu_to_le32(cmd.cdw10);
1356 c.common.cdw11 = cpu_to_le32(cmd.cdw11);
1357 c.common.cdw12 = cpu_to_le32(cmd.cdw12);
1358 c.common.cdw13 = cpu_to_le32(cmd.cdw13);
1359 c.common.cdw14 = cpu_to_le32(cmd.cdw14);
1360 c.common.cdw15 = cpu_to_le32(cmd.cdw15);
1363 timeout = msecs_to_jiffies(cmd.timeout_ms);
1365 effects = nvme_passthru_start(ctrl, ns, cmd.opcode);
1366 status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
1367 (void __user *)(uintptr_t)cmd.addr, cmd.data_len,
1368 (void __user *)(uintptr_t)cmd.metadata, cmd.metadata_len,
1369 0, &cmd.result, timeout);
1370 nvme_passthru_end(ctrl, effects);
1373 if (put_user(cmd.result, &ucmd->result))
1381 * Issue ioctl requests on the first available path. Note that unlike normal
1382 * block layer requests we will not retry failed request on another controller.
1384 static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk,
1385 struct nvme_ns_head **head, int *srcu_idx)
1387 #ifdef CONFIG_NVME_MULTIPATH
1388 if (disk->fops == &nvme_ns_head_ops) {
1391 *head = disk->private_data;
1392 *srcu_idx = srcu_read_lock(&(*head)->srcu);
1393 ns = nvme_find_path(*head);
1395 srcu_read_unlock(&(*head)->srcu, *srcu_idx);
1401 return disk->private_data;
1404 static void nvme_put_ns_from_disk(struct nvme_ns_head *head, int idx)
1407 srcu_read_unlock(&head->srcu, idx);
1410 static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
1411 unsigned int cmd, unsigned long arg)
1413 struct nvme_ns_head *head = NULL;
1414 void __user *argp = (void __user *)arg;
1418 ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx);
1420 return -EWOULDBLOCK;
1423 * Handle ioctls that apply to the controller instead of the namespace
1424 * seperately and drop the ns SRCU reference early. This avoids a
1425 * deadlock when deleting namespaces using the passthrough interface.
1427 if (cmd == NVME_IOCTL_ADMIN_CMD || is_sed_ioctl(cmd)) {
1428 struct nvme_ctrl *ctrl = ns->ctrl;
1430 nvme_get_ctrl(ns->ctrl);
1431 nvme_put_ns_from_disk(head, srcu_idx);
1433 if (cmd == NVME_IOCTL_ADMIN_CMD)
1434 ret = nvme_user_cmd(ctrl, NULL, argp);
1436 ret = sed_ioctl(ctrl->opal_dev, cmd, argp);
1438 nvme_put_ctrl(ctrl);
1444 force_successful_syscall_return();
1445 ret = ns->head->ns_id;
1447 case NVME_IOCTL_IO_CMD:
1448 ret = nvme_user_cmd(ns->ctrl, ns, argp);
1450 case NVME_IOCTL_SUBMIT_IO:
1451 ret = nvme_submit_io(ns, argp);
1455 ret = nvme_nvm_ioctl(ns, cmd, arg);
1460 nvme_put_ns_from_disk(head, srcu_idx);
1464 static int nvme_open(struct block_device *bdev, fmode_t mode)
1466 struct nvme_ns *ns = bdev->bd_disk->private_data;
1468 #ifdef CONFIG_NVME_MULTIPATH
1469 /* should never be called due to GENHD_FL_HIDDEN */
1470 if (WARN_ON_ONCE(ns->head->disk))
1473 if (!kref_get_unless_zero(&ns->kref))
1475 if (!try_module_get(ns->ctrl->ops->module))
1486 static void nvme_release(struct gendisk *disk, fmode_t mode)
1488 struct nvme_ns *ns = disk->private_data;
1490 module_put(ns->ctrl->ops->module);
1494 static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1496 /* some standard values */
1497 geo->heads = 1 << 6;
1498 geo->sectors = 1 << 5;
1499 geo->cylinders = get_capacity(bdev->bd_disk) >> 11;
1503 #ifdef CONFIG_BLK_DEV_INTEGRITY
1504 static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type)
1506 struct blk_integrity integrity;
1508 memset(&integrity, 0, sizeof(integrity));
1510 case NVME_NS_DPS_PI_TYPE3:
1511 integrity.profile = &t10_pi_type3_crc;
1512 integrity.tag_size = sizeof(u16) + sizeof(u32);
1513 integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
1515 case NVME_NS_DPS_PI_TYPE1:
1516 case NVME_NS_DPS_PI_TYPE2:
1517 integrity.profile = &t10_pi_type1_crc;
1518 integrity.tag_size = sizeof(u16);
1519 integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
1522 integrity.profile = NULL;
1525 integrity.tuple_size = ms;
1526 blk_integrity_register(disk, &integrity);
1527 blk_queue_max_integrity_segments(disk->queue, 1);
1530 static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type)
1533 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1535 static void nvme_set_chunk_size(struct nvme_ns *ns)
1537 u32 chunk_size = (((u32)ns->noiob) << (ns->lba_shift - 9));
1538 blk_queue_chunk_sectors(ns->queue, rounddown_pow_of_two(chunk_size));
1541 static void nvme_config_discard(struct gendisk *disk, struct nvme_ns *ns)
1543 struct nvme_ctrl *ctrl = ns->ctrl;
1544 struct request_queue *queue = disk->queue;
1545 u32 size = queue_logical_block_size(queue);
1547 if (!(ctrl->oncs & NVME_CTRL_ONCS_DSM)) {
1548 blk_queue_flag_clear(QUEUE_FLAG_DISCARD, queue);
1552 if (ctrl->nr_streams && ns->sws && ns->sgs)
1553 size *= ns->sws * ns->sgs;
1555 BUILD_BUG_ON(PAGE_SIZE / sizeof(struct nvme_dsm_range) <
1556 NVME_DSM_MAX_RANGES);
1558 queue->limits.discard_alignment = 0;
1559 queue->limits.discard_granularity = size;
1561 /* If discard is already enabled, don't reset queue limits */
1562 if (blk_queue_flag_test_and_set(QUEUE_FLAG_DISCARD, queue))
1565 blk_queue_max_discard_sectors(queue, UINT_MAX);
1566 blk_queue_max_discard_segments(queue, NVME_DSM_MAX_RANGES);
1568 if (ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
1569 blk_queue_max_write_zeroes_sectors(queue, UINT_MAX);
1572 static void nvme_config_write_zeroes(struct gendisk *disk, struct nvme_ns *ns)
1575 unsigned short bs = 1 << ns->lba_shift;
1577 if (!(ns->ctrl->oncs & NVME_CTRL_ONCS_WRITE_ZEROES) ||
1578 (ns->ctrl->quirks & NVME_QUIRK_DISABLE_WRITE_ZEROES))
1581 * Even though NVMe spec explicitly states that MDTS is not
1582 * applicable to the write-zeroes:- "The restriction does not apply to
1583 * commands that do not transfer data between the host and the
1584 * controller (e.g., Write Uncorrectable ro Write Zeroes command).".
1585 * In order to be more cautious use controller's max_hw_sectors value
1586 * to configure the maximum sectors for the write-zeroes which is
1587 * configured based on the controller's MDTS field in the
1588 * nvme_init_identify() if available.
1590 if (ns->ctrl->max_hw_sectors == UINT_MAX)
1591 max_sectors = ((u32)(USHRT_MAX + 1) * bs) >> 9;
1593 max_sectors = ((u32)(ns->ctrl->max_hw_sectors + 1) * bs) >> 9;
1595 blk_queue_max_write_zeroes_sectors(disk->queue, max_sectors);
1598 static int nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid,
1599 struct nvme_id_ns *id, struct nvme_ns_ids *ids)
1603 memset(ids, 0, sizeof(*ids));
1605 if (ctrl->vs >= NVME_VS(1, 1, 0))
1606 memcpy(ids->eui64, id->eui64, sizeof(id->eui64));
1607 if (ctrl->vs >= NVME_VS(1, 2, 0))
1608 memcpy(ids->nguid, id->nguid, sizeof(id->nguid));
1609 if (ctrl->vs >= NVME_VS(1, 3, 0)) {
1610 /* Don't treat error as fatal we potentially
1611 * already have a NGUID or EUI-64
1613 ret = nvme_identify_ns_descs(ctrl, nsid, ids);
1615 dev_warn(ctrl->device,
1616 "Identify Descriptors failed (%d)\n", ret);
1621 static bool nvme_ns_ids_valid(struct nvme_ns_ids *ids)
1623 return !uuid_is_null(&ids->uuid) ||
1624 memchr_inv(ids->nguid, 0, sizeof(ids->nguid)) ||
1625 memchr_inv(ids->eui64, 0, sizeof(ids->eui64));
1628 static bool nvme_ns_ids_equal(struct nvme_ns_ids *a, struct nvme_ns_ids *b)
1630 return uuid_equal(&a->uuid, &b->uuid) &&
1631 memcmp(&a->nguid, &b->nguid, sizeof(a->nguid)) == 0 &&
1632 memcmp(&a->eui64, &b->eui64, sizeof(a->eui64)) == 0;
1635 static void nvme_update_disk_info(struct gendisk *disk,
1636 struct nvme_ns *ns, struct nvme_id_ns *id)
1638 sector_t capacity = le64_to_cpu(id->nsze) << (ns->lba_shift - 9);
1639 unsigned short bs = 1 << ns->lba_shift;
1640 u32 atomic_bs, phys_bs, io_opt;
1642 if (ns->lba_shift > PAGE_SHIFT) {
1643 /* unsupported block size, set capacity to 0 later */
1646 blk_mq_freeze_queue(disk->queue);
1647 blk_integrity_unregister(disk);
1649 if (id->nabo == 0) {
1651 * Bit 1 indicates whether NAWUPF is defined for this namespace
1652 * and whether it should be used instead of AWUPF. If NAWUPF ==
1653 * 0 then AWUPF must be used instead.
1655 if (id->nsfeat & (1 << 1) && id->nawupf)
1656 atomic_bs = (1 + le16_to_cpu(id->nawupf)) * bs;
1658 atomic_bs = (1 + ns->ctrl->subsys->awupf) * bs;
1664 if (id->nsfeat & (1 << 4)) {
1665 /* NPWG = Namespace Preferred Write Granularity */
1666 phys_bs *= 1 + le16_to_cpu(id->npwg);
1667 /* NOWS = Namespace Optimal Write Size */
1668 io_opt *= 1 + le16_to_cpu(id->nows);
1671 blk_queue_logical_block_size(disk->queue, bs);
1673 * Linux filesystems assume writing a single physical block is
1674 * an atomic operation. Hence limit the physical block size to the
1675 * value of the Atomic Write Unit Power Fail parameter.
1677 blk_queue_physical_block_size(disk->queue, min(phys_bs, atomic_bs));
1678 blk_queue_io_min(disk->queue, phys_bs);
1679 blk_queue_io_opt(disk->queue, io_opt);
1681 if (ns->ms && !ns->ext &&
1682 (ns->ctrl->ops->flags & NVME_F_METADATA_SUPPORTED))
1683 nvme_init_integrity(disk, ns->ms, ns->pi_type);
1684 if ((ns->ms && !nvme_ns_has_pi(ns) && !blk_get_integrity(disk)) ||
1685 ns->lba_shift > PAGE_SHIFT)
1688 set_capacity(disk, capacity);
1690 nvme_config_discard(disk, ns);
1691 nvme_config_write_zeroes(disk, ns);
1693 if (id->nsattr & (1 << 0))
1694 set_disk_ro(disk, true);
1696 set_disk_ro(disk, false);
1698 blk_mq_unfreeze_queue(disk->queue);
1701 static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
1703 struct nvme_ns *ns = disk->private_data;
1706 * If identify namespace failed, use default 512 byte block size so
1707 * block layer can use before failing read/write for 0 capacity.
1709 ns->lba_shift = id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ds;
1710 if (ns->lba_shift == 0)
1712 ns->noiob = le16_to_cpu(id->noiob);
1713 ns->ms = le16_to_cpu(id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ms);
1714 ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT);
1715 /* the PI implementation requires metadata equal t10 pi tuple size */
1716 if (ns->ms == sizeof(struct t10_pi_tuple))
1717 ns->pi_type = id->dps & NVME_NS_DPS_PI_MASK;
1722 nvme_set_chunk_size(ns);
1723 nvme_update_disk_info(disk, ns, id);
1724 #ifdef CONFIG_NVME_MULTIPATH
1725 if (ns->head->disk) {
1726 nvme_update_disk_info(ns->head->disk, ns, id);
1727 blk_queue_stack_limits(ns->head->disk->queue, ns->queue);
1732 static int nvme_revalidate_disk(struct gendisk *disk)
1734 struct nvme_ns *ns = disk->private_data;
1735 struct nvme_ctrl *ctrl = ns->ctrl;
1736 struct nvme_id_ns *id;
1737 struct nvme_ns_ids ids;
1740 if (test_bit(NVME_NS_DEAD, &ns->flags)) {
1741 set_capacity(disk, 0);
1745 ret = nvme_identify_ns(ctrl, ns->head->ns_id, &id);
1749 if (id->ncap == 0) {
1754 __nvme_revalidate_disk(disk, id);
1755 ret = nvme_report_ns_ids(ctrl, ns->head->ns_id, id, &ids);
1759 if (!nvme_ns_ids_equal(&ns->head->ids, &ids)) {
1760 dev_err(ctrl->device,
1761 "identifiers changed for nsid %d\n", ns->head->ns_id);
1769 ret = blk_status_to_errno(nvme_error_status(ret));
1773 static char nvme_pr_type(enum pr_type type)
1776 case PR_WRITE_EXCLUSIVE:
1778 case PR_EXCLUSIVE_ACCESS:
1780 case PR_WRITE_EXCLUSIVE_REG_ONLY:
1782 case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1784 case PR_WRITE_EXCLUSIVE_ALL_REGS:
1786 case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1793 static int nvme_pr_command(struct block_device *bdev, u32 cdw10,
1794 u64 key, u64 sa_key, u8 op)
1796 struct nvme_ns_head *head = NULL;
1798 struct nvme_command c;
1800 u8 data[16] = { 0, };
1802 ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx);
1804 return -EWOULDBLOCK;
1806 put_unaligned_le64(key, &data[0]);
1807 put_unaligned_le64(sa_key, &data[8]);
1809 memset(&c, 0, sizeof(c));
1810 c.common.opcode = op;
1811 c.common.nsid = cpu_to_le32(ns->head->ns_id);
1812 c.common.cdw10 = cpu_to_le32(cdw10);
1814 ret = nvme_submit_sync_cmd(ns->queue, &c, data, 16);
1815 nvme_put_ns_from_disk(head, srcu_idx);
1819 static int nvme_pr_register(struct block_device *bdev, u64 old,
1820 u64 new, unsigned flags)
1824 if (flags & ~PR_FL_IGNORE_KEY)
1827 cdw10 = old ? 2 : 0;
1828 cdw10 |= (flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0;
1829 cdw10 |= (1 << 30) | (1 << 31); /* PTPL=1 */
1830 return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_register);
1833 static int nvme_pr_reserve(struct block_device *bdev, u64 key,
1834 enum pr_type type, unsigned flags)
1838 if (flags & ~PR_FL_IGNORE_KEY)
1841 cdw10 = nvme_pr_type(type) << 8;
1842 cdw10 |= ((flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0);
1843 return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_acquire);
1846 static int nvme_pr_preempt(struct block_device *bdev, u64 old, u64 new,
1847 enum pr_type type, bool abort)
1849 u32 cdw10 = nvme_pr_type(type) << 8 | (abort ? 2 : 1);
1850 return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_acquire);
1853 static int nvme_pr_clear(struct block_device *bdev, u64 key)
1855 u32 cdw10 = 1 | (key ? 1 << 3 : 0);
1856 return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_register);
1859 static int nvme_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1861 u32 cdw10 = nvme_pr_type(type) << 8 | (key ? 1 << 3 : 0);
1862 return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_release);
1865 static const struct pr_ops nvme_pr_ops = {
1866 .pr_register = nvme_pr_register,
1867 .pr_reserve = nvme_pr_reserve,
1868 .pr_release = nvme_pr_release,
1869 .pr_preempt = nvme_pr_preempt,
1870 .pr_clear = nvme_pr_clear,
1873 #ifdef CONFIG_BLK_SED_OPAL
1874 int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
1877 struct nvme_ctrl *ctrl = data;
1878 struct nvme_command cmd;
1880 memset(&cmd, 0, sizeof(cmd));
1882 cmd.common.opcode = nvme_admin_security_send;
1884 cmd.common.opcode = nvme_admin_security_recv;
1885 cmd.common.nsid = 0;
1886 cmd.common.cdw10 = cpu_to_le32(((u32)secp) << 24 | ((u32)spsp) << 8);
1887 cmd.common.cdw11 = cpu_to_le32(len);
1889 return __nvme_submit_sync_cmd(ctrl->admin_q, &cmd, NULL, buffer, len,
1890 ADMIN_TIMEOUT, NVME_QID_ANY, 1, 0, false);
1892 EXPORT_SYMBOL_GPL(nvme_sec_submit);
1893 #endif /* CONFIG_BLK_SED_OPAL */
1895 static const struct block_device_operations nvme_fops = {
1896 .owner = THIS_MODULE,
1897 .ioctl = nvme_ioctl,
1898 .compat_ioctl = nvme_ioctl,
1900 .release = nvme_release,
1901 .getgeo = nvme_getgeo,
1902 .revalidate_disk= nvme_revalidate_disk,
1903 .pr_ops = &nvme_pr_ops,
1906 #ifdef CONFIG_NVME_MULTIPATH
1907 static int nvme_ns_head_open(struct block_device *bdev, fmode_t mode)
1909 struct nvme_ns_head *head = bdev->bd_disk->private_data;
1911 if (!kref_get_unless_zero(&head->ref))
1916 static void nvme_ns_head_release(struct gendisk *disk, fmode_t mode)
1918 nvme_put_ns_head(disk->private_data);
1921 const struct block_device_operations nvme_ns_head_ops = {
1922 .owner = THIS_MODULE,
1923 .open = nvme_ns_head_open,
1924 .release = nvme_ns_head_release,
1925 .ioctl = nvme_ioctl,
1926 .compat_ioctl = nvme_ioctl,
1927 .getgeo = nvme_getgeo,
1928 .pr_ops = &nvme_pr_ops,
1930 #endif /* CONFIG_NVME_MULTIPATH */
1932 static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled)
1934 unsigned long timeout =
1935 ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
1936 u32 csts, bit = enabled ? NVME_CSTS_RDY : 0;
1939 while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
1942 if ((csts & NVME_CSTS_RDY) == bit)
1946 if (fatal_signal_pending(current))
1948 if (time_after(jiffies, timeout)) {
1949 dev_err(ctrl->device,
1950 "Device not ready; aborting %s\n", enabled ?
1951 "initialisation" : "reset");
1960 * If the device has been passed off to us in an enabled state, just clear
1961 * the enabled bit. The spec says we should set the 'shutdown notification
1962 * bits', but doing so may cause the device to complete commands to the
1963 * admin queue ... and we don't know what memory that might be pointing at!
1965 int nvme_disable_ctrl(struct nvme_ctrl *ctrl)
1969 ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
1970 ctrl->ctrl_config &= ~NVME_CC_ENABLE;
1972 ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
1976 if (ctrl->quirks & NVME_QUIRK_DELAY_BEFORE_CHK_RDY)
1977 msleep(NVME_QUIRK_DELAY_AMOUNT);
1979 return nvme_wait_ready(ctrl, ctrl->cap, false);
1981 EXPORT_SYMBOL_GPL(nvme_disable_ctrl);
1983 int nvme_enable_ctrl(struct nvme_ctrl *ctrl)
1986 * Default to a 4K page size, with the intention to update this
1987 * path in the future to accomodate architectures with differing
1988 * kernel and IO page sizes.
1990 unsigned dev_page_min, page_shift = 12;
1993 ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &ctrl->cap);
1995 dev_err(ctrl->device, "Reading CAP failed (%d)\n", ret);
1998 dev_page_min = NVME_CAP_MPSMIN(ctrl->cap) + 12;
2000 if (page_shift < dev_page_min) {
2001 dev_err(ctrl->device,
2002 "Minimum device page size %u too large for host (%u)\n",
2003 1 << dev_page_min, 1 << page_shift);
2007 ctrl->page_size = 1 << page_shift;
2009 ctrl->ctrl_config = NVME_CC_CSS_NVM;
2010 ctrl->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT;
2011 ctrl->ctrl_config |= NVME_CC_AMS_RR | NVME_CC_SHN_NONE;
2012 ctrl->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;
2013 ctrl->ctrl_config |= NVME_CC_ENABLE;
2015 ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
2018 return nvme_wait_ready(ctrl, ctrl->cap, true);
2020 EXPORT_SYMBOL_GPL(nvme_enable_ctrl);
2022 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
2024 unsigned long timeout = jiffies + (ctrl->shutdown_timeout * HZ);
2028 ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
2029 ctrl->ctrl_config |= NVME_CC_SHN_NORMAL;
2031 ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
2035 while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
2036 if ((csts & NVME_CSTS_SHST_MASK) == NVME_CSTS_SHST_CMPLT)
2040 if (fatal_signal_pending(current))
2042 if (time_after(jiffies, timeout)) {
2043 dev_err(ctrl->device,
2044 "Device shutdown incomplete; abort shutdown\n");
2051 EXPORT_SYMBOL_GPL(nvme_shutdown_ctrl);
2053 static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
2054 struct request_queue *q)
2058 if (ctrl->max_hw_sectors) {
2060 (ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1;
2062 max_segments = min_not_zero(max_segments, ctrl->max_segments);
2063 blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
2064 blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
2066 if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) &&
2067 is_power_of_2(ctrl->max_hw_sectors))
2068 blk_queue_chunk_sectors(q, ctrl->max_hw_sectors);
2069 blk_queue_virt_boundary(q, ctrl->page_size - 1);
2070 if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
2072 blk_queue_write_cache(q, vwc, vwc);
2075 static int nvme_configure_timestamp(struct nvme_ctrl *ctrl)
2080 if (!(ctrl->oncs & NVME_CTRL_ONCS_TIMESTAMP))
2083 ts = cpu_to_le64(ktime_to_ms(ktime_get_real()));
2084 ret = nvme_set_features(ctrl, NVME_FEAT_TIMESTAMP, 0, &ts, sizeof(ts),
2087 dev_warn_once(ctrl->device,
2088 "could not set timestamp (%d)\n", ret);
2092 static int nvme_configure_acre(struct nvme_ctrl *ctrl)
2094 struct nvme_feat_host_behavior *host;
2097 /* Don't bother enabling the feature if retry delay is not reported */
2101 host = kzalloc(sizeof(*host), GFP_KERNEL);
2105 host->acre = NVME_ENABLE_ACRE;
2106 ret = nvme_set_features(ctrl, NVME_FEAT_HOST_BEHAVIOR, 0,
2107 host, sizeof(*host), NULL);
2112 static int nvme_configure_apst(struct nvme_ctrl *ctrl)
2115 * APST (Autonomous Power State Transition) lets us program a
2116 * table of power state transitions that the controller will
2117 * perform automatically. We configure it with a simple
2118 * heuristic: we are willing to spend at most 2% of the time
2119 * transitioning between power states. Therefore, when running
2120 * in any given state, we will enter the next lower-power
2121 * non-operational state after waiting 50 * (enlat + exlat)
2122 * microseconds, as long as that state's exit latency is under
2123 * the requested maximum latency.
2125 * We will not autonomously enter any non-operational state for
2126 * which the total latency exceeds ps_max_latency_us. Users
2127 * can set ps_max_latency_us to zero to turn off APST.
2131 struct nvme_feat_auto_pst *table;
2137 * If APST isn't supported or if we haven't been initialized yet,
2138 * then don't do anything.
2143 if (ctrl->npss > 31) {
2144 dev_warn(ctrl->device, "NPSS is invalid; not using APST\n");
2148 table = kzalloc(sizeof(*table), GFP_KERNEL);
2152 if (!ctrl->apst_enabled || ctrl->ps_max_latency_us == 0) {
2153 /* Turn off APST. */
2155 dev_dbg(ctrl->device, "APST disabled\n");
2157 __le64 target = cpu_to_le64(0);
2161 * Walk through all states from lowest- to highest-power.
2162 * According to the spec, lower-numbered states use more
2163 * power. NPSS, despite the name, is the index of the
2164 * lowest-power state, not the number of states.
2166 for (state = (int)ctrl->npss; state >= 0; state--) {
2167 u64 total_latency_us, exit_latency_us, transition_ms;
2170 table->entries[state] = target;
2173 * Don't allow transitions to the deepest state
2174 * if it's quirked off.
2176 if (state == ctrl->npss &&
2177 (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS))
2181 * Is this state a useful non-operational state for
2182 * higher-power states to autonomously transition to?
2184 if (!(ctrl->psd[state].flags &
2185 NVME_PS_FLAGS_NON_OP_STATE))
2189 (u64)le32_to_cpu(ctrl->psd[state].exit_lat);
2190 if (exit_latency_us > ctrl->ps_max_latency_us)
2195 le32_to_cpu(ctrl->psd[state].entry_lat);
2198 * This state is good. Use it as the APST idle
2199 * target for higher power states.
2201 transition_ms = total_latency_us + 19;
2202 do_div(transition_ms, 20);
2203 if (transition_ms > (1 << 24) - 1)
2204 transition_ms = (1 << 24) - 1;
2206 target = cpu_to_le64((state << 3) |
2207 (transition_ms << 8));
2212 if (total_latency_us > max_lat_us)
2213 max_lat_us = total_latency_us;
2219 dev_dbg(ctrl->device, "APST enabled but no non-operational states are available\n");
2221 dev_dbg(ctrl->device, "APST enabled: max PS = %d, max round-trip latency = %lluus, table = %*phN\n",
2222 max_ps, max_lat_us, (int)sizeof(*table), table);
2226 ret = nvme_set_features(ctrl, NVME_FEAT_AUTO_PST, apste,
2227 table, sizeof(*table), NULL);
2229 dev_err(ctrl->device, "failed to set APST feature (%d)\n", ret);
2235 static void nvme_set_latency_tolerance(struct device *dev, s32 val)
2237 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
2241 case PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT:
2242 case PM_QOS_LATENCY_ANY:
2250 if (ctrl->ps_max_latency_us != latency) {
2251 ctrl->ps_max_latency_us = latency;
2252 nvme_configure_apst(ctrl);
2256 struct nvme_core_quirk_entry {
2258 * NVMe model and firmware strings are padded with spaces. For
2259 * simplicity, strings in the quirk table are padded with NULLs
2265 unsigned long quirks;
2268 static const struct nvme_core_quirk_entry core_quirks[] = {
2271 * This Toshiba device seems to die using any APST states. See:
2272 * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1678184/comments/11
2275 .mn = "THNSF5256GPUK TOSHIBA",
2276 .quirks = NVME_QUIRK_NO_APST,
2280 /* match is null-terminated but idstr is space-padded. */
2281 static bool string_matches(const char *idstr, const char *match, size_t len)
2288 matchlen = strlen(match);
2289 WARN_ON_ONCE(matchlen > len);
2291 if (memcmp(idstr, match, matchlen))
2294 for (; matchlen < len; matchlen++)
2295 if (idstr[matchlen] != ' ')
2301 static bool quirk_matches(const struct nvme_id_ctrl *id,
2302 const struct nvme_core_quirk_entry *q)
2304 return q->vid == le16_to_cpu(id->vid) &&
2305 string_matches(id->mn, q->mn, sizeof(id->mn)) &&
2306 string_matches(id->fr, q->fr, sizeof(id->fr));
2309 static void nvme_init_subnqn(struct nvme_subsystem *subsys, struct nvme_ctrl *ctrl,
2310 struct nvme_id_ctrl *id)
2315 if(!(ctrl->quirks & NVME_QUIRK_IGNORE_DEV_SUBNQN)) {
2316 nqnlen = strnlen(id->subnqn, NVMF_NQN_SIZE);
2317 if (nqnlen > 0 && nqnlen < NVMF_NQN_SIZE) {
2318 strlcpy(subsys->subnqn, id->subnqn, NVMF_NQN_SIZE);
2322 if (ctrl->vs >= NVME_VS(1, 2, 1))
2323 dev_warn(ctrl->device, "missing or invalid SUBNQN field.\n");
2326 /* Generate a "fake" NQN per Figure 254 in NVMe 1.3 + ECN 001 */
2327 off = snprintf(subsys->subnqn, NVMF_NQN_SIZE,
2328 "nqn.2014.08.org.nvmexpress:%04x%04x",
2329 le16_to_cpu(id->vid), le16_to_cpu(id->ssvid));
2330 memcpy(subsys->subnqn + off, id->sn, sizeof(id->sn));
2331 off += sizeof(id->sn);
2332 memcpy(subsys->subnqn + off, id->mn, sizeof(id->mn));
2333 off += sizeof(id->mn);
2334 memset(subsys->subnqn + off, 0, sizeof(subsys->subnqn) - off);
2337 static void nvme_release_subsystem(struct device *dev)
2339 struct nvme_subsystem *subsys =
2340 container_of(dev, struct nvme_subsystem, dev);
2342 ida_simple_remove(&nvme_subsystems_ida, subsys->instance);
2346 static void nvme_destroy_subsystem(struct kref *ref)
2348 struct nvme_subsystem *subsys =
2349 container_of(ref, struct nvme_subsystem, ref);
2351 mutex_lock(&nvme_subsystems_lock);
2352 list_del(&subsys->entry);
2353 mutex_unlock(&nvme_subsystems_lock);
2355 ida_destroy(&subsys->ns_ida);
2356 device_del(&subsys->dev);
2357 put_device(&subsys->dev);
2360 static void nvme_put_subsystem(struct nvme_subsystem *subsys)
2362 kref_put(&subsys->ref, nvme_destroy_subsystem);
2365 static struct nvme_subsystem *__nvme_find_get_subsystem(const char *subsysnqn)
2367 struct nvme_subsystem *subsys;
2369 lockdep_assert_held(&nvme_subsystems_lock);
2371 list_for_each_entry(subsys, &nvme_subsystems, entry) {
2372 if (strcmp(subsys->subnqn, subsysnqn))
2374 if (!kref_get_unless_zero(&subsys->ref))
2382 #define SUBSYS_ATTR_RO(_name, _mode, _show) \
2383 struct device_attribute subsys_attr_##_name = \
2384 __ATTR(_name, _mode, _show, NULL)
2386 static ssize_t nvme_subsys_show_nqn(struct device *dev,
2387 struct device_attribute *attr,
2390 struct nvme_subsystem *subsys =
2391 container_of(dev, struct nvme_subsystem, dev);
2393 return snprintf(buf, PAGE_SIZE, "%s\n", subsys->subnqn);
2395 static SUBSYS_ATTR_RO(subsysnqn, S_IRUGO, nvme_subsys_show_nqn);
2397 #define nvme_subsys_show_str_function(field) \
2398 static ssize_t subsys_##field##_show(struct device *dev, \
2399 struct device_attribute *attr, char *buf) \
2401 struct nvme_subsystem *subsys = \
2402 container_of(dev, struct nvme_subsystem, dev); \
2403 return sprintf(buf, "%.*s\n", \
2404 (int)sizeof(subsys->field), subsys->field); \
2406 static SUBSYS_ATTR_RO(field, S_IRUGO, subsys_##field##_show);
2408 nvme_subsys_show_str_function(model);
2409 nvme_subsys_show_str_function(serial);
2410 nvme_subsys_show_str_function(firmware_rev);
2412 static struct attribute *nvme_subsys_attrs[] = {
2413 &subsys_attr_model.attr,
2414 &subsys_attr_serial.attr,
2415 &subsys_attr_firmware_rev.attr,
2416 &subsys_attr_subsysnqn.attr,
2417 #ifdef CONFIG_NVME_MULTIPATH
2418 &subsys_attr_iopolicy.attr,
2423 static struct attribute_group nvme_subsys_attrs_group = {
2424 .attrs = nvme_subsys_attrs,
2427 static const struct attribute_group *nvme_subsys_attrs_groups[] = {
2428 &nvme_subsys_attrs_group,
2432 static bool nvme_validate_cntlid(struct nvme_subsystem *subsys,
2433 struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
2435 struct nvme_ctrl *tmp;
2437 lockdep_assert_held(&nvme_subsystems_lock);
2439 list_for_each_entry(tmp, &subsys->ctrls, subsys_entry) {
2440 if (tmp->state == NVME_CTRL_DELETING ||
2441 tmp->state == NVME_CTRL_DEAD)
2444 if (tmp->cntlid == ctrl->cntlid) {
2445 dev_err(ctrl->device,
2446 "Duplicate cntlid %u with %s, rejecting\n",
2447 ctrl->cntlid, dev_name(tmp->device));
2451 if ((id->cmic & (1 << 1)) ||
2452 (ctrl->opts && ctrl->opts->discovery_nqn))
2455 dev_err(ctrl->device,
2456 "Subsystem does not support multiple controllers\n");
2463 static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
2465 struct nvme_subsystem *subsys, *found;
2468 subsys = kzalloc(sizeof(*subsys), GFP_KERNEL);
2471 ret = ida_simple_get(&nvme_subsystems_ida, 0, 0, GFP_KERNEL);
2476 subsys->instance = ret;
2477 mutex_init(&subsys->lock);
2478 kref_init(&subsys->ref);
2479 INIT_LIST_HEAD(&subsys->ctrls);
2480 INIT_LIST_HEAD(&subsys->nsheads);
2481 nvme_init_subnqn(subsys, ctrl, id);
2482 memcpy(subsys->serial, id->sn, sizeof(subsys->serial));
2483 memcpy(subsys->model, id->mn, sizeof(subsys->model));
2484 memcpy(subsys->firmware_rev, id->fr, sizeof(subsys->firmware_rev));
2485 subsys->vendor_id = le16_to_cpu(id->vid);
2486 subsys->cmic = id->cmic;
2487 subsys->awupf = le16_to_cpu(id->awupf);
2488 #ifdef CONFIG_NVME_MULTIPATH
2489 subsys->iopolicy = NVME_IOPOLICY_NUMA;
2492 subsys->dev.class = nvme_subsys_class;
2493 subsys->dev.release = nvme_release_subsystem;
2494 subsys->dev.groups = nvme_subsys_attrs_groups;
2495 dev_set_name(&subsys->dev, "nvme-subsys%d", subsys->instance);
2496 device_initialize(&subsys->dev);
2498 mutex_lock(&nvme_subsystems_lock);
2499 found = __nvme_find_get_subsystem(subsys->subnqn);
2501 put_device(&subsys->dev);
2504 if (!nvme_validate_cntlid(subsys, ctrl, id)) {
2506 goto out_put_subsystem;
2509 ret = device_add(&subsys->dev);
2511 dev_err(ctrl->device,
2512 "failed to register subsystem device.\n");
2515 ida_init(&subsys->ns_ida);
2516 list_add_tail(&subsys->entry, &nvme_subsystems);
2519 if (sysfs_create_link(&subsys->dev.kobj, &ctrl->device->kobj,
2520 dev_name(ctrl->device))) {
2521 dev_err(ctrl->device,
2522 "failed to create sysfs link from subsystem.\n");
2523 goto out_put_subsystem;
2526 ctrl->subsys = subsys;
2527 list_add_tail(&ctrl->subsys_entry, &subsys->ctrls);
2528 mutex_unlock(&nvme_subsystems_lock);
2532 nvme_put_subsystem(subsys);
2534 mutex_unlock(&nvme_subsystems_lock);
2535 put_device(&subsys->dev);
2539 int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp,
2540 void *log, size_t size, u64 offset)
2542 struct nvme_command c = { };
2543 unsigned long dwlen = size / 4 - 1;
2545 c.get_log_page.opcode = nvme_admin_get_log_page;
2546 c.get_log_page.nsid = cpu_to_le32(nsid);
2547 c.get_log_page.lid = log_page;
2548 c.get_log_page.lsp = lsp;
2549 c.get_log_page.numdl = cpu_to_le16(dwlen & ((1 << 16) - 1));
2550 c.get_log_page.numdu = cpu_to_le16(dwlen >> 16);
2551 c.get_log_page.lpol = cpu_to_le32(lower_32_bits(offset));
2552 c.get_log_page.lpou = cpu_to_le32(upper_32_bits(offset));
2554 return nvme_submit_sync_cmd(ctrl->admin_q, &c, log, size);
2557 static int nvme_get_effects_log(struct nvme_ctrl *ctrl)
2562 ctrl->effects = kzalloc(sizeof(*ctrl->effects), GFP_KERNEL);
2567 ret = nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_CMD_EFFECTS, 0,
2568 ctrl->effects, sizeof(*ctrl->effects), 0);
2570 kfree(ctrl->effects);
2571 ctrl->effects = NULL;
2577 * Initialize the cached copies of the Identify data and various controller
2578 * register in our nvme_ctrl structure. This should be called as soon as
2579 * the admin queue is fully up and running.
2581 int nvme_init_identify(struct nvme_ctrl *ctrl)
2583 struct nvme_id_ctrl *id;
2584 int ret, page_shift;
2586 bool prev_apst_enabled;
2588 ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs);
2590 dev_err(ctrl->device, "Reading VS failed (%d)\n", ret);
2593 page_shift = NVME_CAP_MPSMIN(ctrl->cap) + 12;
2594 ctrl->sqsize = min_t(int, NVME_CAP_MQES(ctrl->cap), ctrl->sqsize);
2596 if (ctrl->vs >= NVME_VS(1, 1, 0))
2597 ctrl->subsystem = NVME_CAP_NSSRC(ctrl->cap);
2599 ret = nvme_identify_ctrl(ctrl, &id);
2601 dev_err(ctrl->device, "Identify Controller failed (%d)\n", ret);
2605 if (id->lpa & NVME_CTRL_LPA_CMD_EFFECTS_LOG) {
2606 ret = nvme_get_effects_log(ctrl);
2611 if (!ctrl->identified) {
2614 ret = nvme_init_subsystem(ctrl, id);
2619 * Check for quirks. Quirk can depend on firmware version,
2620 * so, in principle, the set of quirks present can change
2621 * across a reset. As a possible future enhancement, we
2622 * could re-scan for quirks every time we reinitialize
2623 * the device, but we'd have to make sure that the driver
2624 * behaves intelligently if the quirks change.
2626 for (i = 0; i < ARRAY_SIZE(core_quirks); i++) {
2627 if (quirk_matches(id, &core_quirks[i]))
2628 ctrl->quirks |= core_quirks[i].quirks;
2632 if (force_apst && (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS)) {
2633 dev_warn(ctrl->device, "forcibly allowing all power states due to nvme_core.force_apst -- use at your own risk\n");
2634 ctrl->quirks &= ~NVME_QUIRK_NO_DEEPEST_PS;
2637 ctrl->crdt[0] = le16_to_cpu(id->crdt1);
2638 ctrl->crdt[1] = le16_to_cpu(id->crdt2);
2639 ctrl->crdt[2] = le16_to_cpu(id->crdt3);
2641 ctrl->oacs = le16_to_cpu(id->oacs);
2642 ctrl->oncs = le16_to_cpu(id->oncs);
2643 ctrl->mtfa = le16_to_cpu(id->mtfa);
2644 ctrl->oaes = le32_to_cpu(id->oaes);
2645 atomic_set(&ctrl->abort_limit, id->acl + 1);
2646 ctrl->vwc = id->vwc;
2648 max_hw_sectors = 1 << (id->mdts + page_shift - 9);
2650 max_hw_sectors = UINT_MAX;
2651 ctrl->max_hw_sectors =
2652 min_not_zero(ctrl->max_hw_sectors, max_hw_sectors);
2654 nvme_set_queue_limits(ctrl, ctrl->admin_q);
2655 ctrl->sgls = le32_to_cpu(id->sgls);
2656 ctrl->kas = le16_to_cpu(id->kas);
2657 ctrl->max_namespaces = le32_to_cpu(id->mnan);
2658 ctrl->ctratt = le32_to_cpu(id->ctratt);
2662 u32 transition_time = le32_to_cpu(id->rtd3e) / 1000000;
2664 ctrl->shutdown_timeout = clamp_t(unsigned int, transition_time,
2665 shutdown_timeout, 60);
2667 if (ctrl->shutdown_timeout != shutdown_timeout)
2668 dev_info(ctrl->device,
2669 "Shutdown timeout set to %u seconds\n",
2670 ctrl->shutdown_timeout);
2672 ctrl->shutdown_timeout = shutdown_timeout;
2674 ctrl->npss = id->npss;
2675 ctrl->apsta = id->apsta;
2676 prev_apst_enabled = ctrl->apst_enabled;
2677 if (ctrl->quirks & NVME_QUIRK_NO_APST) {
2678 if (force_apst && id->apsta) {
2679 dev_warn(ctrl->device, "forcibly allowing APST due to nvme_core.force_apst -- use at your own risk\n");
2680 ctrl->apst_enabled = true;
2682 ctrl->apst_enabled = false;
2685 ctrl->apst_enabled = id->apsta;
2687 memcpy(ctrl->psd, id->psd, sizeof(ctrl->psd));
2689 if (ctrl->ops->flags & NVME_F_FABRICS) {
2690 ctrl->icdoff = le16_to_cpu(id->icdoff);
2691 ctrl->ioccsz = le32_to_cpu(id->ioccsz);
2692 ctrl->iorcsz = le32_to_cpu(id->iorcsz);
2693 ctrl->maxcmd = le16_to_cpu(id->maxcmd);
2696 * In fabrics we need to verify the cntlid matches the
2699 if (ctrl->cntlid != le16_to_cpu(id->cntlid)) {
2704 if (!ctrl->opts->discovery_nqn && !ctrl->kas) {
2705 dev_err(ctrl->device,
2706 "keep-alive support is mandatory for fabrics\n");
2711 ctrl->cntlid = le16_to_cpu(id->cntlid);
2712 ctrl->hmpre = le32_to_cpu(id->hmpre);
2713 ctrl->hmmin = le32_to_cpu(id->hmmin);
2714 ctrl->hmminds = le32_to_cpu(id->hmminds);
2715 ctrl->hmmaxd = le16_to_cpu(id->hmmaxd);
2718 ret = nvme_mpath_init(ctrl, id);
2724 if (ctrl->apst_enabled && !prev_apst_enabled)
2725 dev_pm_qos_expose_latency_tolerance(ctrl->device);
2726 else if (!ctrl->apst_enabled && prev_apst_enabled)
2727 dev_pm_qos_hide_latency_tolerance(ctrl->device);
2729 ret = nvme_configure_apst(ctrl);
2733 ret = nvme_configure_timestamp(ctrl);
2737 ret = nvme_configure_directives(ctrl);
2741 ret = nvme_configure_acre(ctrl);
2745 ctrl->identified = true;
2753 EXPORT_SYMBOL_GPL(nvme_init_identify);
2755 static int nvme_dev_open(struct inode *inode, struct file *file)
2757 struct nvme_ctrl *ctrl =
2758 container_of(inode->i_cdev, struct nvme_ctrl, cdev);
2760 switch (ctrl->state) {
2761 case NVME_CTRL_LIVE:
2762 case NVME_CTRL_ADMIN_ONLY:
2765 return -EWOULDBLOCK;
2768 file->private_data = ctrl;
2772 static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp)
2777 down_read(&ctrl->namespaces_rwsem);
2778 if (list_empty(&ctrl->namespaces)) {
2783 ns = list_first_entry(&ctrl->namespaces, struct nvme_ns, list);
2784 if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) {
2785 dev_warn(ctrl->device,
2786 "NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n");
2791 dev_warn(ctrl->device,
2792 "using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n");
2793 kref_get(&ns->kref);
2794 up_read(&ctrl->namespaces_rwsem);
2796 ret = nvme_user_cmd(ctrl, ns, argp);
2801 up_read(&ctrl->namespaces_rwsem);
2805 static long nvme_dev_ioctl(struct file *file, unsigned int cmd,
2808 struct nvme_ctrl *ctrl = file->private_data;
2809 void __user *argp = (void __user *)arg;
2812 case NVME_IOCTL_ADMIN_CMD:
2813 return nvme_user_cmd(ctrl, NULL, argp);
2814 case NVME_IOCTL_IO_CMD:
2815 return nvme_dev_user_cmd(ctrl, argp);
2816 case NVME_IOCTL_RESET:
2817 dev_warn(ctrl->device, "resetting controller\n");
2818 return nvme_reset_ctrl_sync(ctrl);
2819 case NVME_IOCTL_SUBSYS_RESET:
2820 return nvme_reset_subsystem(ctrl);
2821 case NVME_IOCTL_RESCAN:
2822 nvme_queue_scan(ctrl);
2829 static const struct file_operations nvme_dev_fops = {
2830 .owner = THIS_MODULE,
2831 .open = nvme_dev_open,
2832 .unlocked_ioctl = nvme_dev_ioctl,
2833 .compat_ioctl = nvme_dev_ioctl,
2836 static ssize_t nvme_sysfs_reset(struct device *dev,
2837 struct device_attribute *attr, const char *buf,
2840 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
2843 ret = nvme_reset_ctrl_sync(ctrl);
2848 static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset);
2850 static ssize_t nvme_sysfs_rescan(struct device *dev,
2851 struct device_attribute *attr, const char *buf,
2854 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
2856 nvme_queue_scan(ctrl);
2859 static DEVICE_ATTR(rescan_controller, S_IWUSR, NULL, nvme_sysfs_rescan);
2861 static inline struct nvme_ns_head *dev_to_ns_head(struct device *dev)
2863 struct gendisk *disk = dev_to_disk(dev);
2865 if (disk->fops == &nvme_fops)
2866 return nvme_get_ns_from_dev(dev)->head;
2868 return disk->private_data;
2871 static ssize_t wwid_show(struct device *dev, struct device_attribute *attr,
2874 struct nvme_ns_head *head = dev_to_ns_head(dev);
2875 struct nvme_ns_ids *ids = &head->ids;
2876 struct nvme_subsystem *subsys = head->subsys;
2877 int serial_len = sizeof(subsys->serial);
2878 int model_len = sizeof(subsys->model);
2880 if (!uuid_is_null(&ids->uuid))
2881 return sprintf(buf, "uuid.%pU\n", &ids->uuid);
2883 if (memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
2884 return sprintf(buf, "eui.%16phN\n", ids->nguid);
2886 if (memchr_inv(ids->eui64, 0, sizeof(ids->eui64)))
2887 return sprintf(buf, "eui.%8phN\n", ids->eui64);
2889 while (serial_len > 0 && (subsys->serial[serial_len - 1] == ' ' ||
2890 subsys->serial[serial_len - 1] == '\0'))
2892 while (model_len > 0 && (subsys->model[model_len - 1] == ' ' ||
2893 subsys->model[model_len - 1] == '\0'))
2896 return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", subsys->vendor_id,
2897 serial_len, subsys->serial, model_len, subsys->model,
2900 static DEVICE_ATTR_RO(wwid);
2902 static ssize_t nguid_show(struct device *dev, struct device_attribute *attr,
2905 return sprintf(buf, "%pU\n", dev_to_ns_head(dev)->ids.nguid);
2907 static DEVICE_ATTR_RO(nguid);
2909 static ssize_t uuid_show(struct device *dev, struct device_attribute *attr,
2912 struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids;
2914 /* For backward compatibility expose the NGUID to userspace if
2915 * we have no UUID set
2917 if (uuid_is_null(&ids->uuid)) {
2918 printk_ratelimited(KERN_WARNING
2919 "No UUID available providing old NGUID\n");
2920 return sprintf(buf, "%pU\n", ids->nguid);
2922 return sprintf(buf, "%pU\n", &ids->uuid);
2924 static DEVICE_ATTR_RO(uuid);
2926 static ssize_t eui_show(struct device *dev, struct device_attribute *attr,
2929 return sprintf(buf, "%8ph\n", dev_to_ns_head(dev)->ids.eui64);
2931 static DEVICE_ATTR_RO(eui);
2933 static ssize_t nsid_show(struct device *dev, struct device_attribute *attr,
2936 return sprintf(buf, "%d\n", dev_to_ns_head(dev)->ns_id);
2938 static DEVICE_ATTR_RO(nsid);
2940 static struct attribute *nvme_ns_id_attrs[] = {
2941 &dev_attr_wwid.attr,
2942 &dev_attr_uuid.attr,
2943 &dev_attr_nguid.attr,
2945 &dev_attr_nsid.attr,
2946 #ifdef CONFIG_NVME_MULTIPATH
2947 &dev_attr_ana_grpid.attr,
2948 &dev_attr_ana_state.attr,
2953 static umode_t nvme_ns_id_attrs_are_visible(struct kobject *kobj,
2954 struct attribute *a, int n)
2956 struct device *dev = container_of(kobj, struct device, kobj);
2957 struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids;
2959 if (a == &dev_attr_uuid.attr) {
2960 if (uuid_is_null(&ids->uuid) &&
2961 !memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
2964 if (a == &dev_attr_nguid.attr) {
2965 if (!memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
2968 if (a == &dev_attr_eui.attr) {
2969 if (!memchr_inv(ids->eui64, 0, sizeof(ids->eui64)))
2972 #ifdef CONFIG_NVME_MULTIPATH
2973 if (a == &dev_attr_ana_grpid.attr || a == &dev_attr_ana_state.attr) {
2974 if (dev_to_disk(dev)->fops != &nvme_fops) /* per-path attr */
2976 if (!nvme_ctrl_use_ana(nvme_get_ns_from_dev(dev)->ctrl))
2983 static const struct attribute_group nvme_ns_id_attr_group = {
2984 .attrs = nvme_ns_id_attrs,
2985 .is_visible = nvme_ns_id_attrs_are_visible,
2988 const struct attribute_group *nvme_ns_id_attr_groups[] = {
2989 &nvme_ns_id_attr_group,
2991 &nvme_nvm_attr_group,
2996 #define nvme_show_str_function(field) \
2997 static ssize_t field##_show(struct device *dev, \
2998 struct device_attribute *attr, char *buf) \
3000 struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \
3001 return sprintf(buf, "%.*s\n", \
3002 (int)sizeof(ctrl->subsys->field), ctrl->subsys->field); \
3004 static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
3006 nvme_show_str_function(model);
3007 nvme_show_str_function(serial);
3008 nvme_show_str_function(firmware_rev);
3010 #define nvme_show_int_function(field) \
3011 static ssize_t field##_show(struct device *dev, \
3012 struct device_attribute *attr, char *buf) \
3014 struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \
3015 return sprintf(buf, "%d\n", ctrl->field); \
3017 static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
3019 nvme_show_int_function(cntlid);
3020 nvme_show_int_function(numa_node);
3022 static ssize_t nvme_sysfs_delete(struct device *dev,
3023 struct device_attribute *attr, const char *buf,
3026 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3028 if (device_remove_file_self(dev, attr))
3029 nvme_delete_ctrl_sync(ctrl);
3032 static DEVICE_ATTR(delete_controller, S_IWUSR, NULL, nvme_sysfs_delete);
3034 static ssize_t nvme_sysfs_show_transport(struct device *dev,
3035 struct device_attribute *attr,
3038 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3040 return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->ops->name);
3042 static DEVICE_ATTR(transport, S_IRUGO, nvme_sysfs_show_transport, NULL);
3044 static ssize_t nvme_sysfs_show_state(struct device *dev,
3045 struct device_attribute *attr,
3048 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3049 static const char *const state_name[] = {
3050 [NVME_CTRL_NEW] = "new",
3051 [NVME_CTRL_LIVE] = "live",
3052 [NVME_CTRL_ADMIN_ONLY] = "only-admin",
3053 [NVME_CTRL_RESETTING] = "resetting",
3054 [NVME_CTRL_CONNECTING] = "connecting",
3055 [NVME_CTRL_DELETING] = "deleting",
3056 [NVME_CTRL_DEAD] = "dead",
3059 if ((unsigned)ctrl->state < ARRAY_SIZE(state_name) &&
3060 state_name[ctrl->state])
3061 return sprintf(buf, "%s\n", state_name[ctrl->state]);
3063 return sprintf(buf, "unknown state\n");
3066 static DEVICE_ATTR(state, S_IRUGO, nvme_sysfs_show_state, NULL);
3068 static ssize_t nvme_sysfs_show_subsysnqn(struct device *dev,
3069 struct device_attribute *attr,
3072 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3074 return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->subsys->subnqn);
3076 static DEVICE_ATTR(subsysnqn, S_IRUGO, nvme_sysfs_show_subsysnqn, NULL);
3078 static ssize_t nvme_sysfs_show_address(struct device *dev,
3079 struct device_attribute *attr,
3082 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3084 return ctrl->ops->get_address(ctrl, buf, PAGE_SIZE);
3086 static DEVICE_ATTR(address, S_IRUGO, nvme_sysfs_show_address, NULL);
3088 static struct attribute *nvme_dev_attrs[] = {
3089 &dev_attr_reset_controller.attr,
3090 &dev_attr_rescan_controller.attr,
3091 &dev_attr_model.attr,
3092 &dev_attr_serial.attr,
3093 &dev_attr_firmware_rev.attr,
3094 &dev_attr_cntlid.attr,
3095 &dev_attr_delete_controller.attr,
3096 &dev_attr_transport.attr,
3097 &dev_attr_subsysnqn.attr,
3098 &dev_attr_address.attr,
3099 &dev_attr_state.attr,
3100 &dev_attr_numa_node.attr,
3104 static umode_t nvme_dev_attrs_are_visible(struct kobject *kobj,
3105 struct attribute *a, int n)
3107 struct device *dev = container_of(kobj, struct device, kobj);
3108 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3110 if (a == &dev_attr_delete_controller.attr && !ctrl->ops->delete_ctrl)
3112 if (a == &dev_attr_address.attr && !ctrl->ops->get_address)
3118 static struct attribute_group nvme_dev_attrs_group = {
3119 .attrs = nvme_dev_attrs,
3120 .is_visible = nvme_dev_attrs_are_visible,
3123 static const struct attribute_group *nvme_dev_attr_groups[] = {
3124 &nvme_dev_attrs_group,
3128 static struct nvme_ns_head *__nvme_find_ns_head(struct nvme_subsystem *subsys,
3131 struct nvme_ns_head *h;
3133 lockdep_assert_held(&subsys->lock);
3135 list_for_each_entry(h, &subsys->nsheads, entry) {
3136 if (h->ns_id == nsid && kref_get_unless_zero(&h->ref))
3143 static int __nvme_check_ids(struct nvme_subsystem *subsys,
3144 struct nvme_ns_head *new)
3146 struct nvme_ns_head *h;
3148 lockdep_assert_held(&subsys->lock);
3150 list_for_each_entry(h, &subsys->nsheads, entry) {
3151 if (nvme_ns_ids_valid(&new->ids) &&
3152 !list_empty(&h->list) &&
3153 nvme_ns_ids_equal(&new->ids, &h->ids))
3160 static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl,
3161 unsigned nsid, struct nvme_id_ns *id)
3163 struct nvme_ns_head *head;
3164 size_t size = sizeof(*head);
3167 #ifdef CONFIG_NVME_MULTIPATH
3168 size += num_possible_nodes() * sizeof(struct nvme_ns *);
3171 head = kzalloc(size, GFP_KERNEL);
3174 ret = ida_simple_get(&ctrl->subsys->ns_ida, 1, 0, GFP_KERNEL);
3177 head->instance = ret;
3178 INIT_LIST_HEAD(&head->list);
3179 ret = init_srcu_struct(&head->srcu);
3181 goto out_ida_remove;
3182 head->subsys = ctrl->subsys;
3184 kref_init(&head->ref);
3186 ret = nvme_report_ns_ids(ctrl, nsid, id, &head->ids);
3188 goto out_cleanup_srcu;
3190 ret = __nvme_check_ids(ctrl->subsys, head);
3192 dev_err(ctrl->device,
3193 "duplicate IDs for nsid %d\n", nsid);
3194 goto out_cleanup_srcu;
3197 ret = nvme_mpath_alloc_disk(ctrl, head);
3199 goto out_cleanup_srcu;
3201 list_add_tail(&head->entry, &ctrl->subsys->nsheads);
3203 kref_get(&ctrl->subsys->ref);
3207 cleanup_srcu_struct(&head->srcu);
3209 ida_simple_remove(&ctrl->subsys->ns_ida, head->instance);
3214 ret = blk_status_to_errno(nvme_error_status(ret));
3215 return ERR_PTR(ret);
3218 static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid,
3219 struct nvme_id_ns *id)
3221 struct nvme_ctrl *ctrl = ns->ctrl;
3222 bool is_shared = id->nmic & (1 << 0);
3223 struct nvme_ns_head *head = NULL;
3226 mutex_lock(&ctrl->subsys->lock);
3228 head = __nvme_find_ns_head(ctrl->subsys, nsid);
3230 head = nvme_alloc_ns_head(ctrl, nsid, id);
3232 ret = PTR_ERR(head);
3236 struct nvme_ns_ids ids;
3238 ret = nvme_report_ns_ids(ctrl, nsid, id, &ids);
3242 if (!nvme_ns_ids_equal(&head->ids, &ids)) {
3243 dev_err(ctrl->device,
3244 "IDs don't match for shared namespace %d\n",
3251 list_add_tail(&ns->siblings, &head->list);
3255 mutex_unlock(&ctrl->subsys->lock);
3257 ret = blk_status_to_errno(nvme_error_status(ret));
3261 static int ns_cmp(void *priv, struct list_head *a, struct list_head *b)
3263 struct nvme_ns *nsa = container_of(a, struct nvme_ns, list);
3264 struct nvme_ns *nsb = container_of(b, struct nvme_ns, list);
3266 return nsa->head->ns_id - nsb->head->ns_id;
3269 static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid)
3271 struct nvme_ns *ns, *ret = NULL;
3273 down_read(&ctrl->namespaces_rwsem);
3274 list_for_each_entry(ns, &ctrl->namespaces, list) {
3275 if (ns->head->ns_id == nsid) {
3276 if (!kref_get_unless_zero(&ns->kref))
3281 if (ns->head->ns_id > nsid)
3284 up_read(&ctrl->namespaces_rwsem);
3288 static int nvme_setup_streams_ns(struct nvme_ctrl *ctrl, struct nvme_ns *ns)
3290 struct streams_directive_params s;
3293 if (!ctrl->nr_streams)
3296 ret = nvme_get_stream_params(ctrl, &s, ns->head->ns_id);
3300 ns->sws = le32_to_cpu(s.sws);
3301 ns->sgs = le16_to_cpu(s.sgs);
3304 unsigned int bs = 1 << ns->lba_shift;
3306 blk_queue_io_min(ns->queue, bs * ns->sws);
3308 blk_queue_io_opt(ns->queue, bs * ns->sws * ns->sgs);
3314 static int nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
3317 struct gendisk *disk;
3318 struct nvme_id_ns *id;
3319 char disk_name[DISK_NAME_LEN];
3320 int node = ctrl->numa_node, flags = GENHD_FL_EXT_DEVT, ret;
3322 ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node);
3326 ns->queue = blk_mq_init_queue(ctrl->tagset);
3327 if (IS_ERR(ns->queue)) {
3328 ret = PTR_ERR(ns->queue);
3332 if (ctrl->opts && ctrl->opts->data_digest)
3333 ns->queue->backing_dev_info->capabilities
3334 |= BDI_CAP_STABLE_WRITES;
3336 blk_queue_flag_set(QUEUE_FLAG_NONROT, ns->queue);
3337 if (ctrl->ops->flags & NVME_F_PCI_P2PDMA)
3338 blk_queue_flag_set(QUEUE_FLAG_PCI_P2PDMA, ns->queue);
3340 ns->queue->queuedata = ns;
3343 kref_init(&ns->kref);
3344 ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */
3346 blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
3347 nvme_set_queue_limits(ctrl, ns->queue);
3349 ret = nvme_identify_ns(ctrl, nsid, &id);
3351 goto out_free_queue;
3353 if (id->ncap == 0) {
3358 ret = nvme_init_ns_head(ns, nsid, id);
3361 nvme_setup_streams_ns(ctrl, ns);
3362 nvme_set_disk_name(disk_name, ns, ctrl, &flags);
3364 disk = alloc_disk_node(0, node);
3370 disk->fops = &nvme_fops;
3371 disk->private_data = ns;
3372 disk->queue = ns->queue;
3373 disk->flags = flags;
3374 memcpy(disk->disk_name, disk_name, DISK_NAME_LEN);
3377 __nvme_revalidate_disk(disk, id);
3379 if ((ctrl->quirks & NVME_QUIRK_LIGHTNVM) && id->vs[0] == 0x1) {
3380 ret = nvme_nvm_register(ns, disk_name, node);
3382 dev_warn(ctrl->device, "LightNVM init failure\n");
3387 down_write(&ctrl->namespaces_rwsem);
3388 list_add_tail(&ns->list, &ctrl->namespaces);
3389 up_write(&ctrl->namespaces_rwsem);
3391 nvme_get_ctrl(ctrl);
3393 device_add_disk(ctrl->device, ns->disk, nvme_ns_id_attr_groups);
3395 nvme_mpath_add_disk(ns, id);
3396 nvme_fault_inject_init(&ns->fault_inject, ns->disk->disk_name);
3403 mutex_lock(&ctrl->subsys->lock);
3404 list_del_rcu(&ns->siblings);
3405 mutex_unlock(&ctrl->subsys->lock);
3406 nvme_put_ns_head(ns->head);
3410 blk_cleanup_queue(ns->queue);
3414 ret = blk_status_to_errno(nvme_error_status(ret));
3418 static void nvme_ns_remove(struct nvme_ns *ns)
3420 if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags))
3423 nvme_fault_inject_fini(&ns->fault_inject);
3425 mutex_lock(&ns->ctrl->subsys->lock);
3426 list_del_rcu(&ns->siblings);
3427 mutex_unlock(&ns->ctrl->subsys->lock);
3428 synchronize_rcu(); /* guarantee not available in head->list */
3429 nvme_mpath_clear_current_path(ns);
3430 synchronize_srcu(&ns->head->srcu); /* wait for concurrent submissions */
3432 if (ns->disk && ns->disk->flags & GENHD_FL_UP) {
3433 del_gendisk(ns->disk);
3434 blk_cleanup_queue(ns->queue);
3435 if (blk_get_integrity(ns->disk))
3436 blk_integrity_unregister(ns->disk);
3439 down_write(&ns->ctrl->namespaces_rwsem);
3440 list_del_init(&ns->list);
3441 up_write(&ns->ctrl->namespaces_rwsem);
3443 nvme_mpath_check_last_path(ns);
3447 static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid)
3451 ns = nvme_find_get_ns(ctrl, nsid);
3453 if (ns->disk && revalidate_disk(ns->disk))
3457 nvme_alloc_ns(ctrl, nsid);
3460 static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl,
3463 struct nvme_ns *ns, *next;
3466 down_write(&ctrl->namespaces_rwsem);
3467 list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) {
3468 if (ns->head->ns_id > nsid || test_bit(NVME_NS_DEAD, &ns->flags))
3469 list_move_tail(&ns->list, &rm_list);
3471 up_write(&ctrl->namespaces_rwsem);
3473 list_for_each_entry_safe(ns, next, &rm_list, list)
3478 static int nvme_scan_ns_list(struct nvme_ctrl *ctrl, unsigned nn)
3482 unsigned i, j, nsid, prev = 0;
3483 unsigned num_lists = DIV_ROUND_UP_ULL((u64)nn, 1024);
3486 ns_list = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL);
3490 for (i = 0; i < num_lists; i++) {
3491 ret = nvme_identify_ns_list(ctrl, prev, ns_list);
3495 for (j = 0; j < min(nn, 1024U); j++) {
3496 nsid = le32_to_cpu(ns_list[j]);
3500 nvme_validate_ns(ctrl, nsid);
3502 while (++prev < nsid) {
3503 ns = nvme_find_get_ns(ctrl, prev);
3513 nvme_remove_invalid_namespaces(ctrl, prev);
3519 static void nvme_scan_ns_sequential(struct nvme_ctrl *ctrl, unsigned nn)
3523 for (i = 1; i <= nn; i++)
3524 nvme_validate_ns(ctrl, i);
3526 nvme_remove_invalid_namespaces(ctrl, nn);
3529 static void nvme_clear_changed_ns_log(struct nvme_ctrl *ctrl)
3531 size_t log_size = NVME_MAX_CHANGED_NAMESPACES * sizeof(__le32);
3535 log = kzalloc(log_size, GFP_KERNEL);
3540 * We need to read the log to clear the AEN, but we don't want to rely
3541 * on it for the changed namespace information as userspace could have
3542 * raced with us in reading the log page, which could cause us to miss
3545 error = nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_CHANGED_NS, 0, log,
3548 dev_warn(ctrl->device,
3549 "reading changed ns log failed: %d\n", error);
3554 static void nvme_scan_work(struct work_struct *work)
3556 struct nvme_ctrl *ctrl =
3557 container_of(work, struct nvme_ctrl, scan_work);
3558 struct nvme_id_ctrl *id;
3561 if (ctrl->state != NVME_CTRL_LIVE)
3564 WARN_ON_ONCE(!ctrl->tagset);
3566 if (test_and_clear_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events)) {
3567 dev_info(ctrl->device, "rescanning namespaces.\n");
3568 nvme_clear_changed_ns_log(ctrl);
3571 if (nvme_identify_ctrl(ctrl, &id))
3574 mutex_lock(&ctrl->scan_lock);
3575 nn = le32_to_cpu(id->nn);
3576 if (ctrl->vs >= NVME_VS(1, 1, 0) &&
3577 !(ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)) {
3578 if (!nvme_scan_ns_list(ctrl, nn))
3581 nvme_scan_ns_sequential(ctrl, nn);
3583 mutex_unlock(&ctrl->scan_lock);
3585 down_write(&ctrl->namespaces_rwsem);
3586 list_sort(NULL, &ctrl->namespaces, ns_cmp);
3587 up_write(&ctrl->namespaces_rwsem);
3591 * This function iterates the namespace list unlocked to allow recovery from
3592 * controller failure. It is up to the caller to ensure the namespace list is
3593 * not modified by scan work while this function is executing.
3595 void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
3597 struct nvme_ns *ns, *next;
3600 /* prevent racing with ns scanning */
3601 flush_work(&ctrl->scan_work);
3604 * The dead states indicates the controller was not gracefully
3605 * disconnected. In that case, we won't be able to flush any data while
3606 * removing the namespaces' disks; fail all the queues now to avoid
3607 * potentially having to clean up the failed sync later.
3609 if (ctrl->state == NVME_CTRL_DEAD)
3610 nvme_kill_queues(ctrl);
3612 down_write(&ctrl->namespaces_rwsem);
3613 list_splice_init(&ctrl->namespaces, &ns_list);
3614 up_write(&ctrl->namespaces_rwsem);
3616 list_for_each_entry_safe(ns, next, &ns_list, list)
3619 EXPORT_SYMBOL_GPL(nvme_remove_namespaces);
3621 static void nvme_aen_uevent(struct nvme_ctrl *ctrl)
3623 char *envp[2] = { NULL, NULL };
3624 u32 aen_result = ctrl->aen_result;
3626 ctrl->aen_result = 0;
3630 envp[0] = kasprintf(GFP_KERNEL, "NVME_AEN=%#08x", aen_result);
3633 kobject_uevent_env(&ctrl->device->kobj, KOBJ_CHANGE, envp);
3637 static void nvme_async_event_work(struct work_struct *work)
3639 struct nvme_ctrl *ctrl =
3640 container_of(work, struct nvme_ctrl, async_event_work);
3642 nvme_aen_uevent(ctrl);
3643 ctrl->ops->submit_async_event(ctrl);
3646 static bool nvme_ctrl_pp_status(struct nvme_ctrl *ctrl)
3651 if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts))
3657 return ((ctrl->ctrl_config & NVME_CC_ENABLE) && (csts & NVME_CSTS_PP));
3660 static void nvme_get_fw_slot_info(struct nvme_ctrl *ctrl)
3662 struct nvme_fw_slot_info_log *log;
3664 log = kmalloc(sizeof(*log), GFP_KERNEL);
3668 if (nvme_get_log(ctrl, NVME_NSID_ALL, 0, NVME_LOG_FW_SLOT, log,
3670 dev_warn(ctrl->device, "Get FW SLOT INFO log error\n");
3674 static void nvme_fw_act_work(struct work_struct *work)
3676 struct nvme_ctrl *ctrl = container_of(work,
3677 struct nvme_ctrl, fw_act_work);
3678 unsigned long fw_act_timeout;
3681 fw_act_timeout = jiffies +
3682 msecs_to_jiffies(ctrl->mtfa * 100);
3684 fw_act_timeout = jiffies +
3685 msecs_to_jiffies(admin_timeout * 1000);
3687 nvme_stop_queues(ctrl);
3688 while (nvme_ctrl_pp_status(ctrl)) {
3689 if (time_after(jiffies, fw_act_timeout)) {
3690 dev_warn(ctrl->device,
3691 "Fw activation timeout, reset controller\n");
3692 nvme_reset_ctrl(ctrl);
3698 if (ctrl->state != NVME_CTRL_LIVE)
3701 nvme_start_queues(ctrl);
3702 /* read FW slot information to clear the AER */
3703 nvme_get_fw_slot_info(ctrl);
3706 static void nvme_handle_aen_notice(struct nvme_ctrl *ctrl, u32 result)
3708 u32 aer_notice_type = (result & 0xff00) >> 8;
3710 trace_nvme_async_event(ctrl, aer_notice_type);
3712 switch (aer_notice_type) {
3713 case NVME_AER_NOTICE_NS_CHANGED:
3714 set_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events);
3715 nvme_queue_scan(ctrl);
3717 case NVME_AER_NOTICE_FW_ACT_STARTING:
3718 queue_work(nvme_wq, &ctrl->fw_act_work);
3720 #ifdef CONFIG_NVME_MULTIPATH
3721 case NVME_AER_NOTICE_ANA:
3722 if (!ctrl->ana_log_buf)
3724 queue_work(nvme_wq, &ctrl->ana_work);
3728 dev_warn(ctrl->device, "async event result %08x\n", result);
3732 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
3733 volatile union nvme_result *res)
3735 u32 result = le32_to_cpu(res->u32);
3736 u32 aer_type = result & 0x07;
3738 if (le16_to_cpu(status) >> 1 != NVME_SC_SUCCESS)
3742 case NVME_AER_NOTICE:
3743 nvme_handle_aen_notice(ctrl, result);
3745 case NVME_AER_ERROR:
3746 case NVME_AER_SMART:
3749 trace_nvme_async_event(ctrl, aer_type);
3750 ctrl->aen_result = result;
3755 queue_work(nvme_wq, &ctrl->async_event_work);
3757 EXPORT_SYMBOL_GPL(nvme_complete_async_event);
3759 void nvme_stop_ctrl(struct nvme_ctrl *ctrl)
3761 nvme_mpath_stop(ctrl);
3762 nvme_stop_keep_alive(ctrl);
3763 flush_work(&ctrl->async_event_work);
3764 cancel_work_sync(&ctrl->fw_act_work);
3766 EXPORT_SYMBOL_GPL(nvme_stop_ctrl);
3768 void nvme_start_ctrl(struct nvme_ctrl *ctrl)
3771 nvme_start_keep_alive(ctrl);
3773 if (ctrl->queue_count > 1) {
3774 nvme_queue_scan(ctrl);
3775 nvme_enable_aen(ctrl);
3776 queue_work(nvme_wq, &ctrl->async_event_work);
3777 nvme_start_queues(ctrl);
3780 EXPORT_SYMBOL_GPL(nvme_start_ctrl);
3782 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl)
3784 nvme_fault_inject_fini(&ctrl->fault_inject);
3785 dev_pm_qos_hide_latency_tolerance(ctrl->device);
3786 cdev_device_del(&ctrl->cdev, ctrl->device);
3788 EXPORT_SYMBOL_GPL(nvme_uninit_ctrl);
3790 static void nvme_free_ctrl(struct device *dev)
3792 struct nvme_ctrl *ctrl =
3793 container_of(dev, struct nvme_ctrl, ctrl_device);
3794 struct nvme_subsystem *subsys = ctrl->subsys;
3796 ida_simple_remove(&nvme_instance_ida, ctrl->instance);
3797 kfree(ctrl->effects);
3798 nvme_mpath_uninit(ctrl);
3799 __free_page(ctrl->discard_page);
3802 mutex_lock(&nvme_subsystems_lock);
3803 list_del(&ctrl->subsys_entry);
3804 sysfs_remove_link(&subsys->dev.kobj, dev_name(ctrl->device));
3805 mutex_unlock(&nvme_subsystems_lock);
3808 ctrl->ops->free_ctrl(ctrl);
3811 nvme_put_subsystem(subsys);
3815 * Initialize a NVMe controller structures. This needs to be called during
3816 * earliest initialization so that we have the initialized structured around
3819 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
3820 const struct nvme_ctrl_ops *ops, unsigned long quirks)
3824 ctrl->state = NVME_CTRL_NEW;
3825 spin_lock_init(&ctrl->lock);
3826 mutex_init(&ctrl->scan_lock);
3827 INIT_LIST_HEAD(&ctrl->namespaces);
3828 init_rwsem(&ctrl->namespaces_rwsem);
3831 ctrl->quirks = quirks;
3832 INIT_WORK(&ctrl->scan_work, nvme_scan_work);
3833 INIT_WORK(&ctrl->async_event_work, nvme_async_event_work);
3834 INIT_WORK(&ctrl->fw_act_work, nvme_fw_act_work);
3835 INIT_WORK(&ctrl->delete_work, nvme_delete_ctrl_work);
3837 INIT_DELAYED_WORK(&ctrl->ka_work, nvme_keep_alive_work);
3838 memset(&ctrl->ka_cmd, 0, sizeof(ctrl->ka_cmd));
3839 ctrl->ka_cmd.common.opcode = nvme_admin_keep_alive;
3841 BUILD_BUG_ON(NVME_DSM_MAX_RANGES * sizeof(struct nvme_dsm_range) >
3843 ctrl->discard_page = alloc_page(GFP_KERNEL);
3844 if (!ctrl->discard_page) {
3849 ret = ida_simple_get(&nvme_instance_ida, 0, 0, GFP_KERNEL);
3852 ctrl->instance = ret;
3854 device_initialize(&ctrl->ctrl_device);
3855 ctrl->device = &ctrl->ctrl_device;
3856 ctrl->device->devt = MKDEV(MAJOR(nvme_chr_devt), ctrl->instance);
3857 ctrl->device->class = nvme_class;
3858 ctrl->device->parent = ctrl->dev;
3859 ctrl->device->groups = nvme_dev_attr_groups;
3860 ctrl->device->release = nvme_free_ctrl;
3861 dev_set_drvdata(ctrl->device, ctrl);
3862 ret = dev_set_name(ctrl->device, "nvme%d", ctrl->instance);
3864 goto out_release_instance;
3866 cdev_init(&ctrl->cdev, &nvme_dev_fops);
3867 ctrl->cdev.owner = ops->module;
3868 ret = cdev_device_add(&ctrl->cdev, ctrl->device);
3873 * Initialize latency tolerance controls. The sysfs files won't
3874 * be visible to userspace unless the device actually supports APST.
3876 ctrl->device->power.set_latency_tolerance = nvme_set_latency_tolerance;
3877 dev_pm_qos_update_user_latency_tolerance(ctrl->device,
3878 min(default_ps_max_latency_us, (unsigned long)S32_MAX));
3880 nvme_fault_inject_init(&ctrl->fault_inject, dev_name(ctrl->device));
3884 kfree_const(ctrl->device->kobj.name);
3885 out_release_instance:
3886 ida_simple_remove(&nvme_instance_ida, ctrl->instance);
3888 if (ctrl->discard_page)
3889 __free_page(ctrl->discard_page);
3892 EXPORT_SYMBOL_GPL(nvme_init_ctrl);
3895 * nvme_kill_queues(): Ends all namespace queues
3896 * @ctrl: the dead controller that needs to end
3898 * Call this function when the driver determines it is unable to get the
3899 * controller in a state capable of servicing IO.
3901 void nvme_kill_queues(struct nvme_ctrl *ctrl)
3905 down_read(&ctrl->namespaces_rwsem);
3907 /* Forcibly unquiesce queues to avoid blocking dispatch */
3908 if (ctrl->admin_q && !blk_queue_dying(ctrl->admin_q))
3909 blk_mq_unquiesce_queue(ctrl->admin_q);
3911 list_for_each_entry(ns, &ctrl->namespaces, list)
3912 nvme_set_queue_dying(ns);
3914 up_read(&ctrl->namespaces_rwsem);
3916 EXPORT_SYMBOL_GPL(nvme_kill_queues);
3918 void nvme_unfreeze(struct nvme_ctrl *ctrl)
3922 down_read(&ctrl->namespaces_rwsem);
3923 list_for_each_entry(ns, &ctrl->namespaces, list)
3924 blk_mq_unfreeze_queue(ns->queue);
3925 up_read(&ctrl->namespaces_rwsem);
3927 EXPORT_SYMBOL_GPL(nvme_unfreeze);
3929 void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout)
3933 down_read(&ctrl->namespaces_rwsem);
3934 list_for_each_entry(ns, &ctrl->namespaces, list) {
3935 timeout = blk_mq_freeze_queue_wait_timeout(ns->queue, timeout);
3939 up_read(&ctrl->namespaces_rwsem);
3941 EXPORT_SYMBOL_GPL(nvme_wait_freeze_timeout);
3943 void nvme_wait_freeze(struct nvme_ctrl *ctrl)
3947 down_read(&ctrl->namespaces_rwsem);
3948 list_for_each_entry(ns, &ctrl->namespaces, list)
3949 blk_mq_freeze_queue_wait(ns->queue);
3950 up_read(&ctrl->namespaces_rwsem);
3952 EXPORT_SYMBOL_GPL(nvme_wait_freeze);
3954 void nvme_start_freeze(struct nvme_ctrl *ctrl)
3958 down_read(&ctrl->namespaces_rwsem);
3959 list_for_each_entry(ns, &ctrl->namespaces, list)
3960 blk_freeze_queue_start(ns->queue);
3961 up_read(&ctrl->namespaces_rwsem);
3963 EXPORT_SYMBOL_GPL(nvme_start_freeze);
3965 void nvme_stop_queues(struct nvme_ctrl *ctrl)
3969 down_read(&ctrl->namespaces_rwsem);
3970 list_for_each_entry(ns, &ctrl->namespaces, list)
3971 blk_mq_quiesce_queue(ns->queue);
3972 up_read(&ctrl->namespaces_rwsem);
3974 EXPORT_SYMBOL_GPL(nvme_stop_queues);
3976 void nvme_start_queues(struct nvme_ctrl *ctrl)
3980 down_read(&ctrl->namespaces_rwsem);
3981 list_for_each_entry(ns, &ctrl->namespaces, list)
3982 blk_mq_unquiesce_queue(ns->queue);
3983 up_read(&ctrl->namespaces_rwsem);
3985 EXPORT_SYMBOL_GPL(nvme_start_queues);
3988 void nvme_sync_queues(struct nvme_ctrl *ctrl)
3992 down_read(&ctrl->namespaces_rwsem);
3993 list_for_each_entry(ns, &ctrl->namespaces, list)
3994 blk_sync_queue(ns->queue);
3995 up_read(&ctrl->namespaces_rwsem);
3997 EXPORT_SYMBOL_GPL(nvme_sync_queues);
4000 * Check we didn't inadvertently grow the command structure sizes:
4002 static inline void _nvme_check_size(void)
4004 BUILD_BUG_ON(sizeof(struct nvme_common_command) != 64);
4005 BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64);
4006 BUILD_BUG_ON(sizeof(struct nvme_identify) != 64);
4007 BUILD_BUG_ON(sizeof(struct nvme_features) != 64);
4008 BUILD_BUG_ON(sizeof(struct nvme_download_firmware) != 64);
4009 BUILD_BUG_ON(sizeof(struct nvme_format_cmd) != 64);
4010 BUILD_BUG_ON(sizeof(struct nvme_dsm_cmd) != 64);
4011 BUILD_BUG_ON(sizeof(struct nvme_write_zeroes_cmd) != 64);
4012 BUILD_BUG_ON(sizeof(struct nvme_abort_cmd) != 64);
4013 BUILD_BUG_ON(sizeof(struct nvme_get_log_page_command) != 64);
4014 BUILD_BUG_ON(sizeof(struct nvme_command) != 64);
4015 BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != NVME_IDENTIFY_DATA_SIZE);
4016 BUILD_BUG_ON(sizeof(struct nvme_id_ns) != NVME_IDENTIFY_DATA_SIZE);
4017 BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64);
4018 BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512);
4019 BUILD_BUG_ON(sizeof(struct nvme_dbbuf) != 64);
4020 BUILD_BUG_ON(sizeof(struct nvme_directive_cmd) != 64);
4024 static int __init nvme_core_init(void)
4026 int result = -ENOMEM;
4030 nvme_wq = alloc_workqueue("nvme-wq",
4031 WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
4035 nvme_reset_wq = alloc_workqueue("nvme-reset-wq",
4036 WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
4040 nvme_delete_wq = alloc_workqueue("nvme-delete-wq",
4041 WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
4042 if (!nvme_delete_wq)
4043 goto destroy_reset_wq;
4045 result = alloc_chrdev_region(&nvme_chr_devt, 0, NVME_MINORS, "nvme");
4047 goto destroy_delete_wq;
4049 nvme_class = class_create(THIS_MODULE, "nvme");
4050 if (IS_ERR(nvme_class)) {
4051 result = PTR_ERR(nvme_class);
4052 goto unregister_chrdev;
4055 nvme_subsys_class = class_create(THIS_MODULE, "nvme-subsystem");
4056 if (IS_ERR(nvme_subsys_class)) {
4057 result = PTR_ERR(nvme_subsys_class);
4063 class_destroy(nvme_class);
4065 unregister_chrdev_region(nvme_chr_devt, NVME_MINORS);
4067 destroy_workqueue(nvme_delete_wq);
4069 destroy_workqueue(nvme_reset_wq);
4071 destroy_workqueue(nvme_wq);
4076 static void __exit nvme_core_exit(void)
4078 ida_destroy(&nvme_subsystems_ida);
4079 class_destroy(nvme_subsys_class);
4080 class_destroy(nvme_class);
4081 unregister_chrdev_region(nvme_chr_devt, NVME_MINORS);
4082 destroy_workqueue(nvme_delete_wq);
4083 destroy_workqueue(nvme_reset_wq);
4084 destroy_workqueue(nvme_wq);
4087 MODULE_LICENSE("GPL");
4088 MODULE_VERSION("1.0");
4089 module_init(nvme_core_init);
4090 module_exit(nvme_core_exit);