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/compat.h>
10 #include <linux/delay.h>
11 #include <linux/errno.h>
12 #include <linux/hdreg.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/backing-dev.h>
16 #include <linux/list_sort.h>
17 #include <linux/slab.h>
18 #include <linux/types.h>
20 #include <linux/ptrace.h>
21 #include <linux/nvme_ioctl.h>
22 #include <linux/t10-pi.h>
23 #include <linux/pm_qos.h>
24 #include <asm/unaligned.h>
29 #define CREATE_TRACE_POINTS
32 #define NVME_MINORS (1U << MINORBITS)
34 unsigned int admin_timeout = 60;
35 module_param(admin_timeout, uint, 0644);
36 MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands");
37 EXPORT_SYMBOL_GPL(admin_timeout);
39 unsigned int nvme_io_timeout = 30;
40 module_param_named(io_timeout, nvme_io_timeout, uint, 0644);
41 MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O");
42 EXPORT_SYMBOL_GPL(nvme_io_timeout);
44 static unsigned char shutdown_timeout = 5;
45 module_param(shutdown_timeout, byte, 0644);
46 MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown");
48 static u8 nvme_max_retries = 5;
49 module_param_named(max_retries, nvme_max_retries, byte, 0644);
50 MODULE_PARM_DESC(max_retries, "max number of retries a command may have");
52 static unsigned long default_ps_max_latency_us = 100000;
53 module_param(default_ps_max_latency_us, ulong, 0644);
54 MODULE_PARM_DESC(default_ps_max_latency_us,
55 "max power saving latency for new devices; use PM QOS to change per device");
57 static bool force_apst;
58 module_param(force_apst, bool, 0644);
59 MODULE_PARM_DESC(force_apst, "allow APST for newly enumerated devices even if quirked off");
62 module_param(streams, bool, 0644);
63 MODULE_PARM_DESC(streams, "turn on support for Streams write directives");
66 * nvme_wq - hosts nvme related works that are not reset or delete
67 * nvme_reset_wq - hosts nvme reset works
68 * nvme_delete_wq - hosts nvme delete works
70 * nvme_wq will host works such as scan, aen handling, fw activation,
71 * keep-alive, periodic reconnects etc. nvme_reset_wq
72 * runs reset works which also flush works hosted on nvme_wq for
73 * serialization purposes. nvme_delete_wq host controller deletion
74 * works which flush reset works for serialization.
76 struct workqueue_struct *nvme_wq;
77 EXPORT_SYMBOL_GPL(nvme_wq);
79 struct workqueue_struct *nvme_reset_wq;
80 EXPORT_SYMBOL_GPL(nvme_reset_wq);
82 struct workqueue_struct *nvme_delete_wq;
83 EXPORT_SYMBOL_GPL(nvme_delete_wq);
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 blk_set_queue_dying(ns->queue);
107 /* Forcibly unquiesce queues to avoid blocking dispatch */
108 blk_mq_unquiesce_queue(ns->queue);
110 * Revalidate after unblocking dispatchers that may be holding bd_butex
112 revalidate_disk(ns->disk);
115 static void nvme_queue_scan(struct nvme_ctrl *ctrl)
118 * Only new queue scan work when admin and IO queues are both alive
120 if (ctrl->state == NVME_CTRL_LIVE && ctrl->tagset)
121 queue_work(nvme_wq, &ctrl->scan_work);
125 * Use this function to proceed with scheduling reset_work for a controller
126 * that had previously been set to the resetting state. This is intended for
127 * code paths that can't be interrupted by other reset attempts. A hot removal
128 * may prevent this from succeeding.
130 int nvme_try_sched_reset(struct nvme_ctrl *ctrl)
132 if (ctrl->state != NVME_CTRL_RESETTING)
134 if (!queue_work(nvme_reset_wq, &ctrl->reset_work))
138 EXPORT_SYMBOL_GPL(nvme_try_sched_reset);
140 int nvme_reset_ctrl(struct nvme_ctrl *ctrl)
142 if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING))
144 if (!queue_work(nvme_reset_wq, &ctrl->reset_work))
148 EXPORT_SYMBOL_GPL(nvme_reset_ctrl);
150 int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl)
154 ret = nvme_reset_ctrl(ctrl);
156 flush_work(&ctrl->reset_work);
157 if (ctrl->state != NVME_CTRL_LIVE)
163 EXPORT_SYMBOL_GPL(nvme_reset_ctrl_sync);
165 static void nvme_do_delete_ctrl(struct nvme_ctrl *ctrl)
167 dev_info(ctrl->device,
168 "Removing ctrl: NQN \"%s\"\n", ctrl->opts->subsysnqn);
170 flush_work(&ctrl->reset_work);
171 nvme_stop_ctrl(ctrl);
172 nvme_remove_namespaces(ctrl);
173 ctrl->ops->delete_ctrl(ctrl);
174 nvme_uninit_ctrl(ctrl);
177 static void nvme_delete_ctrl_work(struct work_struct *work)
179 struct nvme_ctrl *ctrl =
180 container_of(work, struct nvme_ctrl, delete_work);
182 nvme_do_delete_ctrl(ctrl);
185 int nvme_delete_ctrl(struct nvme_ctrl *ctrl)
187 if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING))
189 if (!queue_work(nvme_delete_wq, &ctrl->delete_work))
193 EXPORT_SYMBOL_GPL(nvme_delete_ctrl);
195 static void nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl)
198 * Keep a reference until nvme_do_delete_ctrl() complete,
199 * since ->delete_ctrl can free the controller.
202 if (nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING))
203 nvme_do_delete_ctrl(ctrl);
207 static inline bool nvme_ns_has_pi(struct nvme_ns *ns)
209 return ns->pi_type && ns->ms == sizeof(struct t10_pi_tuple);
212 static blk_status_t nvme_error_status(u16 status)
214 switch (status & 0x7ff) {
215 case NVME_SC_SUCCESS:
217 case NVME_SC_CAP_EXCEEDED:
218 return BLK_STS_NOSPC;
219 case NVME_SC_LBA_RANGE:
220 case NVME_SC_CMD_INTERRUPTED:
221 case NVME_SC_NS_NOT_READY:
222 return BLK_STS_TARGET;
223 case NVME_SC_BAD_ATTRIBUTES:
224 case NVME_SC_ONCS_NOT_SUPPORTED:
225 case NVME_SC_INVALID_OPCODE:
226 case NVME_SC_INVALID_FIELD:
227 case NVME_SC_INVALID_NS:
228 return BLK_STS_NOTSUPP;
229 case NVME_SC_WRITE_FAULT:
230 case NVME_SC_READ_ERROR:
231 case NVME_SC_UNWRITTEN_BLOCK:
232 case NVME_SC_ACCESS_DENIED:
233 case NVME_SC_READ_ONLY:
234 case NVME_SC_COMPARE_FAILED:
235 return BLK_STS_MEDIUM;
236 case NVME_SC_GUARD_CHECK:
237 case NVME_SC_APPTAG_CHECK:
238 case NVME_SC_REFTAG_CHECK:
239 case NVME_SC_INVALID_PI:
240 return BLK_STS_PROTECTION;
241 case NVME_SC_RESERVATION_CONFLICT:
242 return BLK_STS_NEXUS;
243 case NVME_SC_HOST_PATH_ERROR:
244 return BLK_STS_TRANSPORT;
246 return BLK_STS_IOERR;
250 static inline bool nvme_req_needs_retry(struct request *req)
252 if (blk_noretry_request(req))
254 if (nvme_req(req)->status & NVME_SC_DNR)
256 if (nvme_req(req)->retries >= nvme_max_retries)
261 static void nvme_retry_req(struct request *req)
263 struct nvme_ns *ns = req->q->queuedata;
264 unsigned long delay = 0;
267 /* The mask and shift result must be <= 3 */
268 crd = (nvme_req(req)->status & NVME_SC_CRD) >> 11;
270 delay = ns->ctrl->crdt[crd - 1] * 100;
272 nvme_req(req)->retries++;
273 blk_mq_requeue_request(req, false);
274 blk_mq_delay_kick_requeue_list(req->q, delay);
277 void nvme_complete_rq(struct request *req)
279 blk_status_t status = nvme_error_status(nvme_req(req)->status);
281 trace_nvme_complete_rq(req);
283 nvme_cleanup_cmd(req);
285 if (nvme_req(req)->ctrl->kas)
286 nvme_req(req)->ctrl->comp_seen = true;
288 if (unlikely(status != BLK_STS_OK && nvme_req_needs_retry(req))) {
289 if ((req->cmd_flags & REQ_NVME_MPATH) && nvme_failover_req(req))
292 if (!blk_queue_dying(req->q)) {
298 nvme_trace_bio_complete(req, status);
299 blk_mq_end_request(req, status);
301 EXPORT_SYMBOL_GPL(nvme_complete_rq);
303 bool nvme_cancel_request(struct request *req, void *data, bool reserved)
305 dev_dbg_ratelimited(((struct nvme_ctrl *) data)->device,
306 "Cancelling I/O %d", req->tag);
308 /* don't abort one completed request */
309 if (blk_mq_request_completed(req))
312 nvme_req(req)->status = NVME_SC_HOST_ABORTED_CMD;
313 blk_mq_complete_request(req);
316 EXPORT_SYMBOL_GPL(nvme_cancel_request);
318 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
319 enum nvme_ctrl_state new_state)
321 enum nvme_ctrl_state old_state;
323 bool changed = false;
325 spin_lock_irqsave(&ctrl->lock, flags);
327 old_state = ctrl->state;
332 case NVME_CTRL_RESETTING:
333 case NVME_CTRL_CONNECTING:
340 case NVME_CTRL_RESETTING:
350 case NVME_CTRL_CONNECTING:
353 case NVME_CTRL_RESETTING:
360 case NVME_CTRL_DELETING:
363 case NVME_CTRL_RESETTING:
364 case NVME_CTRL_CONNECTING:
373 case NVME_CTRL_DELETING:
385 ctrl->state = new_state;
386 wake_up_all(&ctrl->state_wq);
389 spin_unlock_irqrestore(&ctrl->lock, flags);
390 if (changed && ctrl->state == NVME_CTRL_LIVE)
391 nvme_kick_requeue_lists(ctrl);
394 EXPORT_SYMBOL_GPL(nvme_change_ctrl_state);
397 * Returns true for sink states that can't ever transition back to live.
399 static bool nvme_state_terminal(struct nvme_ctrl *ctrl)
401 switch (ctrl->state) {
404 case NVME_CTRL_RESETTING:
405 case NVME_CTRL_CONNECTING:
407 case NVME_CTRL_DELETING:
411 WARN_ONCE(1, "Unhandled ctrl state:%d", ctrl->state);
417 * Waits for the controller state to be resetting, or returns false if it is
418 * not possible to ever transition to that state.
420 bool nvme_wait_reset(struct nvme_ctrl *ctrl)
422 wait_event(ctrl->state_wq,
423 nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING) ||
424 nvme_state_terminal(ctrl));
425 return ctrl->state == NVME_CTRL_RESETTING;
427 EXPORT_SYMBOL_GPL(nvme_wait_reset);
429 static void nvme_free_ns_head(struct kref *ref)
431 struct nvme_ns_head *head =
432 container_of(ref, struct nvme_ns_head, ref);
434 nvme_mpath_remove_disk(head);
435 ida_simple_remove(&head->subsys->ns_ida, head->instance);
436 cleanup_srcu_struct(&head->srcu);
437 nvme_put_subsystem(head->subsys);
441 static void nvme_put_ns_head(struct nvme_ns_head *head)
443 kref_put(&head->ref, nvme_free_ns_head);
446 static void nvme_free_ns(struct kref *kref)
448 struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref);
451 nvme_nvm_unregister(ns);
454 nvme_put_ns_head(ns->head);
455 nvme_put_ctrl(ns->ctrl);
459 static void nvme_put_ns(struct nvme_ns *ns)
461 kref_put(&ns->kref, nvme_free_ns);
464 static inline void nvme_clear_nvme_request(struct request *req)
466 if (!(req->rq_flags & RQF_DONTPREP)) {
467 nvme_req(req)->retries = 0;
468 nvme_req(req)->flags = 0;
469 req->rq_flags |= RQF_DONTPREP;
473 struct request *nvme_alloc_request(struct request_queue *q,
474 struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid)
476 unsigned op = nvme_is_write(cmd) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN;
479 if (qid == NVME_QID_ANY) {
480 req = blk_mq_alloc_request(q, op, flags);
482 req = blk_mq_alloc_request_hctx(q, op, flags,
488 req->cmd_flags |= REQ_FAILFAST_DRIVER;
489 nvme_clear_nvme_request(req);
490 nvme_req(req)->cmd = cmd;
494 EXPORT_SYMBOL_GPL(nvme_alloc_request);
496 static int nvme_toggle_streams(struct nvme_ctrl *ctrl, bool enable)
498 struct nvme_command c;
500 memset(&c, 0, sizeof(c));
502 c.directive.opcode = nvme_admin_directive_send;
503 c.directive.nsid = cpu_to_le32(NVME_NSID_ALL);
504 c.directive.doper = NVME_DIR_SND_ID_OP_ENABLE;
505 c.directive.dtype = NVME_DIR_IDENTIFY;
506 c.directive.tdtype = NVME_DIR_STREAMS;
507 c.directive.endir = enable ? NVME_DIR_ENDIR : 0;
509 return nvme_submit_sync_cmd(ctrl->admin_q, &c, NULL, 0);
512 static int nvme_disable_streams(struct nvme_ctrl *ctrl)
514 return nvme_toggle_streams(ctrl, false);
517 static int nvme_enable_streams(struct nvme_ctrl *ctrl)
519 return nvme_toggle_streams(ctrl, true);
522 static int nvme_get_stream_params(struct nvme_ctrl *ctrl,
523 struct streams_directive_params *s, u32 nsid)
525 struct nvme_command c;
527 memset(&c, 0, sizeof(c));
528 memset(s, 0, sizeof(*s));
530 c.directive.opcode = nvme_admin_directive_recv;
531 c.directive.nsid = cpu_to_le32(nsid);
532 c.directive.numd = cpu_to_le32(nvme_bytes_to_numd(sizeof(*s)));
533 c.directive.doper = NVME_DIR_RCV_ST_OP_PARAM;
534 c.directive.dtype = NVME_DIR_STREAMS;
536 return nvme_submit_sync_cmd(ctrl->admin_q, &c, s, sizeof(*s));
539 static int nvme_configure_directives(struct nvme_ctrl *ctrl)
541 struct streams_directive_params s;
544 if (!(ctrl->oacs & NVME_CTRL_OACS_DIRECTIVES))
549 ret = nvme_enable_streams(ctrl);
553 ret = nvme_get_stream_params(ctrl, &s, NVME_NSID_ALL);
557 ctrl->nssa = le16_to_cpu(s.nssa);
558 if (ctrl->nssa < BLK_MAX_WRITE_HINTS - 1) {
559 dev_info(ctrl->device, "too few streams (%u) available\n",
561 nvme_disable_streams(ctrl);
565 ctrl->nr_streams = min_t(unsigned, ctrl->nssa, BLK_MAX_WRITE_HINTS - 1);
566 dev_info(ctrl->device, "Using %u streams\n", ctrl->nr_streams);
571 * Check if 'req' has a write hint associated with it. If it does, assign
572 * a valid namespace stream to the write.
574 static void nvme_assign_write_stream(struct nvme_ctrl *ctrl,
575 struct request *req, u16 *control,
578 enum rw_hint streamid = req->write_hint;
580 if (streamid == WRITE_LIFE_NOT_SET || streamid == WRITE_LIFE_NONE)
584 if (WARN_ON_ONCE(streamid > ctrl->nr_streams))
587 *control |= NVME_RW_DTYPE_STREAMS;
588 *dsmgmt |= streamid << 16;
591 if (streamid < ARRAY_SIZE(req->q->write_hints))
592 req->q->write_hints[streamid] += blk_rq_bytes(req) >> 9;
595 static inline void nvme_setup_flush(struct nvme_ns *ns,
596 struct nvme_command *cmnd)
598 cmnd->common.opcode = nvme_cmd_flush;
599 cmnd->common.nsid = cpu_to_le32(ns->head->ns_id);
602 static blk_status_t nvme_setup_discard(struct nvme_ns *ns, struct request *req,
603 struct nvme_command *cmnd)
605 unsigned short segments = blk_rq_nr_discard_segments(req), n = 0;
606 struct nvme_dsm_range *range;
610 * Some devices do not consider the DSM 'Number of Ranges' field when
611 * determining how much data to DMA. Always allocate memory for maximum
612 * number of segments to prevent device reading beyond end of buffer.
614 static const size_t alloc_size = sizeof(*range) * NVME_DSM_MAX_RANGES;
616 range = kzalloc(alloc_size, GFP_ATOMIC | __GFP_NOWARN);
619 * If we fail allocation our range, fallback to the controller
620 * discard page. If that's also busy, it's safe to return
621 * busy, as we know we can make progress once that's freed.
623 if (test_and_set_bit_lock(0, &ns->ctrl->discard_page_busy))
624 return BLK_STS_RESOURCE;
626 range = page_address(ns->ctrl->discard_page);
629 __rq_for_each_bio(bio, req) {
630 u64 slba = nvme_sect_to_lba(ns, bio->bi_iter.bi_sector);
631 u32 nlb = bio->bi_iter.bi_size >> ns->lba_shift;
634 range[n].cattr = cpu_to_le32(0);
635 range[n].nlb = cpu_to_le32(nlb);
636 range[n].slba = cpu_to_le64(slba);
641 if (WARN_ON_ONCE(n != segments)) {
642 if (virt_to_page(range) == ns->ctrl->discard_page)
643 clear_bit_unlock(0, &ns->ctrl->discard_page_busy);
646 return BLK_STS_IOERR;
649 cmnd->dsm.opcode = nvme_cmd_dsm;
650 cmnd->dsm.nsid = cpu_to_le32(ns->head->ns_id);
651 cmnd->dsm.nr = cpu_to_le32(segments - 1);
652 cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
654 req->special_vec.bv_page = virt_to_page(range);
655 req->special_vec.bv_offset = offset_in_page(range);
656 req->special_vec.bv_len = alloc_size;
657 req->rq_flags |= RQF_SPECIAL_PAYLOAD;
662 static inline blk_status_t nvme_setup_write_zeroes(struct nvme_ns *ns,
663 struct request *req, struct nvme_command *cmnd)
665 if (ns->ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
666 return nvme_setup_discard(ns, req, cmnd);
668 cmnd->write_zeroes.opcode = nvme_cmd_write_zeroes;
669 cmnd->write_zeroes.nsid = cpu_to_le32(ns->head->ns_id);
670 cmnd->write_zeroes.slba =
671 cpu_to_le64(nvme_sect_to_lba(ns, blk_rq_pos(req)));
672 cmnd->write_zeroes.length =
673 cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
674 cmnd->write_zeroes.control = 0;
678 static inline blk_status_t nvme_setup_rw(struct nvme_ns *ns,
679 struct request *req, struct nvme_command *cmnd)
681 struct nvme_ctrl *ctrl = ns->ctrl;
685 if (req->cmd_flags & REQ_FUA)
686 control |= NVME_RW_FUA;
687 if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD))
688 control |= NVME_RW_LR;
690 if (req->cmd_flags & REQ_RAHEAD)
691 dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;
693 cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read);
694 cmnd->rw.nsid = cpu_to_le32(ns->head->ns_id);
695 cmnd->rw.slba = cpu_to_le64(nvme_sect_to_lba(ns, blk_rq_pos(req)));
696 cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
698 if (req_op(req) == REQ_OP_WRITE && ctrl->nr_streams)
699 nvme_assign_write_stream(ctrl, req, &control, &dsmgmt);
703 * If formated with metadata, the block layer always provides a
704 * metadata buffer if CONFIG_BLK_DEV_INTEGRITY is enabled. Else
705 * we enable the PRACT bit for protection information or set the
706 * namespace capacity to zero to prevent any I/O.
708 if (!blk_integrity_rq(req)) {
709 if (WARN_ON_ONCE(!nvme_ns_has_pi(ns)))
710 return BLK_STS_NOTSUPP;
711 control |= NVME_RW_PRINFO_PRACT;
714 switch (ns->pi_type) {
715 case NVME_NS_DPS_PI_TYPE3:
716 control |= NVME_RW_PRINFO_PRCHK_GUARD;
718 case NVME_NS_DPS_PI_TYPE1:
719 case NVME_NS_DPS_PI_TYPE2:
720 control |= NVME_RW_PRINFO_PRCHK_GUARD |
721 NVME_RW_PRINFO_PRCHK_REF;
722 cmnd->rw.reftag = cpu_to_le32(t10_pi_ref_tag(req));
727 cmnd->rw.control = cpu_to_le16(control);
728 cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
732 void nvme_cleanup_cmd(struct request *req)
734 if (req->rq_flags & RQF_SPECIAL_PAYLOAD) {
735 struct nvme_ns *ns = req->rq_disk->private_data;
736 struct page *page = req->special_vec.bv_page;
738 if (page == ns->ctrl->discard_page)
739 clear_bit_unlock(0, &ns->ctrl->discard_page_busy);
741 kfree(page_address(page) + req->special_vec.bv_offset);
744 EXPORT_SYMBOL_GPL(nvme_cleanup_cmd);
746 blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
747 struct nvme_command *cmd)
749 blk_status_t ret = BLK_STS_OK;
751 nvme_clear_nvme_request(req);
753 memset(cmd, 0, sizeof(*cmd));
754 switch (req_op(req)) {
757 memcpy(cmd, nvme_req(req)->cmd, sizeof(*cmd));
760 nvme_setup_flush(ns, cmd);
762 case REQ_OP_WRITE_ZEROES:
763 ret = nvme_setup_write_zeroes(ns, req, cmd);
766 ret = nvme_setup_discard(ns, req, cmd);
770 ret = nvme_setup_rw(ns, req, cmd);
774 return BLK_STS_IOERR;
777 cmd->common.command_id = req->tag;
778 trace_nvme_setup_cmd(req, cmd);
781 EXPORT_SYMBOL_GPL(nvme_setup_cmd);
783 static void nvme_end_sync_rq(struct request *rq, blk_status_t error)
785 struct completion *waiting = rq->end_io_data;
787 rq->end_io_data = NULL;
791 static void nvme_execute_rq_polled(struct request_queue *q,
792 struct gendisk *bd_disk, struct request *rq, int at_head)
794 DECLARE_COMPLETION_ONSTACK(wait);
796 WARN_ON_ONCE(!test_bit(QUEUE_FLAG_POLL, &q->queue_flags));
798 rq->cmd_flags |= REQ_HIPRI;
799 rq->end_io_data = &wait;
800 blk_execute_rq_nowait(q, bd_disk, rq, at_head, nvme_end_sync_rq);
802 while (!completion_done(&wait)) {
803 blk_poll(q, request_to_qc_t(rq->mq_hctx, rq), true);
809 * Returns 0 on success. If the result is negative, it's a Linux error code;
810 * if the result is positive, it's an NVM Express status code
812 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
813 union nvme_result *result, void *buffer, unsigned bufflen,
814 unsigned timeout, int qid, int at_head,
815 blk_mq_req_flags_t flags, bool poll)
820 req = nvme_alloc_request(q, cmd, flags, qid);
824 req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
826 if (buffer && bufflen) {
827 ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL);
833 nvme_execute_rq_polled(req->q, NULL, req, at_head);
835 blk_execute_rq(req->q, NULL, req, at_head);
837 *result = nvme_req(req)->result;
838 if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
841 ret = nvme_req(req)->status;
843 blk_mq_free_request(req);
846 EXPORT_SYMBOL_GPL(__nvme_submit_sync_cmd);
848 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
849 void *buffer, unsigned bufflen)
851 return __nvme_submit_sync_cmd(q, cmd, NULL, buffer, bufflen, 0,
852 NVME_QID_ANY, 0, 0, false);
854 EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd);
856 static void *nvme_add_user_metadata(struct bio *bio, void __user *ubuf,
857 unsigned len, u32 seed, bool write)
859 struct bio_integrity_payload *bip;
863 buf = kmalloc(len, GFP_KERNEL);
868 if (write && copy_from_user(buf, ubuf, len))
871 bip = bio_integrity_alloc(bio, GFP_KERNEL, 1);
877 bip->bip_iter.bi_size = len;
878 bip->bip_iter.bi_sector = seed;
879 ret = bio_integrity_add_page(bio, virt_to_page(buf), len,
880 offset_in_page(buf));
890 static int nvme_submit_user_cmd(struct request_queue *q,
891 struct nvme_command *cmd, void __user *ubuffer,
892 unsigned bufflen, void __user *meta_buffer, unsigned meta_len,
893 u32 meta_seed, u64 *result, unsigned timeout)
895 bool write = nvme_is_write(cmd);
896 struct nvme_ns *ns = q->queuedata;
897 struct gendisk *disk = ns ? ns->disk : NULL;
899 struct bio *bio = NULL;
903 req = nvme_alloc_request(q, cmd, 0, NVME_QID_ANY);
907 req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
908 nvme_req(req)->flags |= NVME_REQ_USERCMD;
910 if (ubuffer && bufflen) {
911 ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
917 if (disk && meta_buffer && meta_len) {
918 meta = nvme_add_user_metadata(bio, meta_buffer, meta_len,
924 req->cmd_flags |= REQ_INTEGRITY;
928 blk_execute_rq(req->q, disk, req, 0);
929 if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
932 ret = nvme_req(req)->status;
934 *result = le64_to_cpu(nvme_req(req)->result.u64);
935 if (meta && !ret && !write) {
936 if (copy_to_user(meta_buffer, meta, meta_len))
942 blk_rq_unmap_user(bio);
944 blk_mq_free_request(req);
948 static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status)
950 struct nvme_ctrl *ctrl = rq->end_io_data;
952 bool startka = false;
954 blk_mq_free_request(rq);
957 dev_err(ctrl->device,
958 "failed nvme_keep_alive_end_io error=%d\n",
963 ctrl->comp_seen = false;
964 spin_lock_irqsave(&ctrl->lock, flags);
965 if (ctrl->state == NVME_CTRL_LIVE ||
966 ctrl->state == NVME_CTRL_CONNECTING)
968 spin_unlock_irqrestore(&ctrl->lock, flags);
970 queue_delayed_work(nvme_wq, &ctrl->ka_work, ctrl->kato * HZ);
973 static int nvme_keep_alive(struct nvme_ctrl *ctrl)
977 rq = nvme_alloc_request(ctrl->admin_q, &ctrl->ka_cmd, BLK_MQ_REQ_RESERVED,
982 rq->timeout = ctrl->kato * HZ;
983 rq->end_io_data = ctrl;
985 blk_execute_rq_nowait(rq->q, NULL, rq, 0, nvme_keep_alive_end_io);
990 static void nvme_keep_alive_work(struct work_struct *work)
992 struct nvme_ctrl *ctrl = container_of(to_delayed_work(work),
993 struct nvme_ctrl, ka_work);
994 bool comp_seen = ctrl->comp_seen;
996 if ((ctrl->ctratt & NVME_CTRL_ATTR_TBKAS) && comp_seen) {
997 dev_dbg(ctrl->device,
998 "reschedule traffic based keep-alive timer\n");
999 ctrl->comp_seen = false;
1000 queue_delayed_work(nvme_wq, &ctrl->ka_work, ctrl->kato * HZ);
1004 if (nvme_keep_alive(ctrl)) {
1005 /* allocation failure, reset the controller */
1006 dev_err(ctrl->device, "keep-alive failed\n");
1007 nvme_reset_ctrl(ctrl);
1012 static void nvme_start_keep_alive(struct nvme_ctrl *ctrl)
1014 if (unlikely(ctrl->kato == 0))
1017 queue_delayed_work(nvme_wq, &ctrl->ka_work, ctrl->kato * HZ);
1020 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl)
1022 if (unlikely(ctrl->kato == 0))
1025 cancel_delayed_work_sync(&ctrl->ka_work);
1027 EXPORT_SYMBOL_GPL(nvme_stop_keep_alive);
1030 * In NVMe 1.0 the CNS field was just a binary controller or namespace
1031 * flag, thus sending any new CNS opcodes has a big chance of not working.
1032 * Qemu unfortunately had that bug after reporting a 1.1 version compliance
1033 * (but not for any later version).
1035 static bool nvme_ctrl_limited_cns(struct nvme_ctrl *ctrl)
1037 if (ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)
1038 return ctrl->vs < NVME_VS(1, 2, 0);
1039 return ctrl->vs < NVME_VS(1, 1, 0);
1042 static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
1044 struct nvme_command c = { };
1047 /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
1048 c.identify.opcode = nvme_admin_identify;
1049 c.identify.cns = NVME_ID_CNS_CTRL;
1051 *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL);
1055 error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
1056 sizeof(struct nvme_id_ctrl));
1062 static int nvme_process_ns_desc(struct nvme_ctrl *ctrl, struct nvme_ns_ids *ids,
1063 struct nvme_ns_id_desc *cur)
1065 const char *warn_str = "ctrl returned bogus length:";
1068 switch (cur->nidt) {
1069 case NVME_NIDT_EUI64:
1070 if (cur->nidl != NVME_NIDT_EUI64_LEN) {
1071 dev_warn(ctrl->device, "%s %d for NVME_NIDT_EUI64\n",
1072 warn_str, cur->nidl);
1075 memcpy(ids->eui64, data + sizeof(*cur), NVME_NIDT_EUI64_LEN);
1076 return NVME_NIDT_EUI64_LEN;
1077 case NVME_NIDT_NGUID:
1078 if (cur->nidl != NVME_NIDT_NGUID_LEN) {
1079 dev_warn(ctrl->device, "%s %d for NVME_NIDT_NGUID\n",
1080 warn_str, cur->nidl);
1083 memcpy(ids->nguid, data + sizeof(*cur), NVME_NIDT_NGUID_LEN);
1084 return NVME_NIDT_NGUID_LEN;
1085 case NVME_NIDT_UUID:
1086 if (cur->nidl != NVME_NIDT_UUID_LEN) {
1087 dev_warn(ctrl->device, "%s %d for NVME_NIDT_UUID\n",
1088 warn_str, cur->nidl);
1091 uuid_copy(&ids->uuid, data + sizeof(*cur));
1092 return NVME_NIDT_UUID_LEN;
1094 /* Skip unknown types */
1099 static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
1100 struct nvme_ns_ids *ids)
1102 struct nvme_command c = { };
1108 c.identify.opcode = nvme_admin_identify;
1109 c.identify.nsid = cpu_to_le32(nsid);
1110 c.identify.cns = NVME_ID_CNS_NS_DESC_LIST;
1112 data = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL);
1116 status = nvme_submit_sync_cmd(ctrl->admin_q, &c, data,
1117 NVME_IDENTIFY_DATA_SIZE);
1119 dev_warn(ctrl->device,
1120 "Identify Descriptors failed (%d)\n", status);
1122 * Don't treat an error as fatal, as we potentially already
1123 * have a NGUID or EUI-64.
1125 if (status > 0 && !(status & NVME_SC_DNR))
1130 for (pos = 0; pos < NVME_IDENTIFY_DATA_SIZE; pos += len) {
1131 struct nvme_ns_id_desc *cur = data + pos;
1136 len = nvme_process_ns_desc(ctrl, ids, cur);
1140 len += sizeof(*cur);
1147 static int nvme_identify_ns_list(struct nvme_ctrl *dev, unsigned nsid, __le32 *ns_list)
1149 struct nvme_command c = { };
1151 c.identify.opcode = nvme_admin_identify;
1152 c.identify.cns = NVME_ID_CNS_NS_ACTIVE_LIST;
1153 c.identify.nsid = cpu_to_le32(nsid);
1154 return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list,
1155 NVME_IDENTIFY_DATA_SIZE);
1158 static int nvme_identify_ns(struct nvme_ctrl *ctrl,
1159 unsigned nsid, struct nvme_id_ns **id)
1161 struct nvme_command c = { };
1164 /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
1165 c.identify.opcode = nvme_admin_identify;
1166 c.identify.nsid = cpu_to_le32(nsid);
1167 c.identify.cns = NVME_ID_CNS_NS;
1169 *id = kmalloc(sizeof(**id), GFP_KERNEL);
1173 error = nvme_submit_sync_cmd(ctrl->admin_q, &c, *id, sizeof(**id));
1175 dev_warn(ctrl->device, "Identify namespace failed (%d)\n", error);
1182 static int nvme_features(struct nvme_ctrl *dev, u8 op, unsigned int fid,
1183 unsigned int dword11, void *buffer, size_t buflen, u32 *result)
1185 union nvme_result res = { 0 };
1186 struct nvme_command c;
1189 memset(&c, 0, sizeof(c));
1190 c.features.opcode = op;
1191 c.features.fid = cpu_to_le32(fid);
1192 c.features.dword11 = cpu_to_le32(dword11);
1194 ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &res,
1195 buffer, buflen, 0, NVME_QID_ANY, 0, 0, false);
1196 if (ret >= 0 && result)
1197 *result = le32_to_cpu(res.u32);
1201 int nvme_set_features(struct nvme_ctrl *dev, unsigned int fid,
1202 unsigned int dword11, void *buffer, size_t buflen,
1205 return nvme_features(dev, nvme_admin_set_features, fid, dword11, buffer,
1208 EXPORT_SYMBOL_GPL(nvme_set_features);
1210 int nvme_get_features(struct nvme_ctrl *dev, unsigned int fid,
1211 unsigned int dword11, void *buffer, size_t buflen,
1214 return nvme_features(dev, nvme_admin_get_features, fid, dword11, buffer,
1217 EXPORT_SYMBOL_GPL(nvme_get_features);
1219 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count)
1221 u32 q_count = (*count - 1) | ((*count - 1) << 16);
1223 int status, nr_io_queues;
1225 status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, NULL, 0,
1231 * Degraded controllers might return an error when setting the queue
1232 * count. We still want to be able to bring them online and offer
1233 * access to the admin queue, as that might be only way to fix them up.
1236 dev_err(ctrl->device, "Could not set queue count (%d)\n", status);
1239 nr_io_queues = min(result & 0xffff, result >> 16) + 1;
1240 *count = min(*count, nr_io_queues);
1245 EXPORT_SYMBOL_GPL(nvme_set_queue_count);
1247 #define NVME_AEN_SUPPORTED \
1248 (NVME_AEN_CFG_NS_ATTR | NVME_AEN_CFG_FW_ACT | \
1249 NVME_AEN_CFG_ANA_CHANGE | NVME_AEN_CFG_DISC_CHANGE)
1251 static void nvme_enable_aen(struct nvme_ctrl *ctrl)
1253 u32 result, supported_aens = ctrl->oaes & NVME_AEN_SUPPORTED;
1256 if (!supported_aens)
1259 status = nvme_set_features(ctrl, NVME_FEAT_ASYNC_EVENT, supported_aens,
1262 dev_warn(ctrl->device, "Failed to configure AEN (cfg %x)\n",
1265 queue_work(nvme_wq, &ctrl->async_event_work);
1269 * Convert integer values from ioctl structures to user pointers, silently
1270 * ignoring the upper bits in the compat case to match behaviour of 32-bit
1273 static void __user *nvme_to_user_ptr(uintptr_t ptrval)
1275 if (in_compat_syscall())
1276 ptrval = (compat_uptr_t)ptrval;
1277 return (void __user *)ptrval;
1280 static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
1282 struct nvme_user_io io;
1283 struct nvme_command c;
1284 unsigned length, meta_len;
1285 void __user *metadata;
1287 if (copy_from_user(&io, uio, sizeof(io)))
1292 switch (io.opcode) {
1293 case nvme_cmd_write:
1295 case nvme_cmd_compare:
1301 length = (io.nblocks + 1) << ns->lba_shift;
1302 meta_len = (io.nblocks + 1) * ns->ms;
1303 metadata = nvme_to_user_ptr(io.metadata);
1308 } else if (meta_len) {
1309 if ((io.metadata & 3) || !io.metadata)
1313 memset(&c, 0, sizeof(c));
1314 c.rw.opcode = io.opcode;
1315 c.rw.flags = io.flags;
1316 c.rw.nsid = cpu_to_le32(ns->head->ns_id);
1317 c.rw.slba = cpu_to_le64(io.slba);
1318 c.rw.length = cpu_to_le16(io.nblocks);
1319 c.rw.control = cpu_to_le16(io.control);
1320 c.rw.dsmgmt = cpu_to_le32(io.dsmgmt);
1321 c.rw.reftag = cpu_to_le32(io.reftag);
1322 c.rw.apptag = cpu_to_le16(io.apptag);
1323 c.rw.appmask = cpu_to_le16(io.appmask);
1325 return nvme_submit_user_cmd(ns->queue, &c,
1326 nvme_to_user_ptr(io.addr), length,
1327 metadata, meta_len, lower_32_bits(io.slba), NULL, 0);
1330 static u32 nvme_known_admin_effects(u8 opcode)
1333 case nvme_admin_format_nvm:
1334 return NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC |
1335 NVME_CMD_EFFECTS_CSE_MASK;
1336 case nvme_admin_sanitize_nvm:
1337 return NVME_CMD_EFFECTS_CSE_MASK;
1344 static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
1351 effects = le32_to_cpu(ctrl->effects->iocs[opcode]);
1352 if (effects & ~(NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC))
1353 dev_warn(ctrl->device,
1354 "IO command:%02x has unhandled effects:%08x\n",
1360 effects = le32_to_cpu(ctrl->effects->acs[opcode]);
1361 effects |= nvme_known_admin_effects(opcode);
1364 * For simplicity, IO to all namespaces is quiesced even if the command
1365 * effects say only one namespace is affected.
1367 if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) {
1368 mutex_lock(&ctrl->scan_lock);
1369 mutex_lock(&ctrl->subsys->lock);
1370 nvme_mpath_start_freeze(ctrl->subsys);
1371 nvme_mpath_wait_freeze(ctrl->subsys);
1372 nvme_start_freeze(ctrl);
1373 nvme_wait_freeze(ctrl);
1378 static void nvme_update_formats(struct nvme_ctrl *ctrl)
1382 down_read(&ctrl->namespaces_rwsem);
1383 list_for_each_entry(ns, &ctrl->namespaces, list)
1384 if (ns->disk && nvme_revalidate_disk(ns->disk))
1385 nvme_set_queue_dying(ns);
1386 up_read(&ctrl->namespaces_rwsem);
1389 static void nvme_passthru_end(struct nvme_ctrl *ctrl, u32 effects)
1392 * Revalidate LBA changes prior to unfreezing. This is necessary to
1393 * prevent memory corruption if a logical block size was changed by
1396 if (effects & NVME_CMD_EFFECTS_LBCC)
1397 nvme_update_formats(ctrl);
1398 if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) {
1399 nvme_unfreeze(ctrl);
1400 nvme_mpath_unfreeze(ctrl->subsys);
1401 mutex_unlock(&ctrl->subsys->lock);
1402 nvme_remove_invalid_namespaces(ctrl, NVME_NSID_ALL);
1403 mutex_unlock(&ctrl->scan_lock);
1405 if (effects & NVME_CMD_EFFECTS_CCC)
1406 nvme_init_identify(ctrl);
1407 if (effects & (NVME_CMD_EFFECTS_NIC | NVME_CMD_EFFECTS_NCC))
1408 nvme_queue_scan(ctrl);
1411 static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
1412 struct nvme_passthru_cmd __user *ucmd)
1414 struct nvme_passthru_cmd cmd;
1415 struct nvme_command c;
1416 unsigned timeout = 0;
1421 if (!capable(CAP_SYS_ADMIN))
1423 if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
1428 memset(&c, 0, sizeof(c));
1429 c.common.opcode = cmd.opcode;
1430 c.common.flags = cmd.flags;
1431 c.common.nsid = cpu_to_le32(cmd.nsid);
1432 c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
1433 c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
1434 c.common.cdw10 = cpu_to_le32(cmd.cdw10);
1435 c.common.cdw11 = cpu_to_le32(cmd.cdw11);
1436 c.common.cdw12 = cpu_to_le32(cmd.cdw12);
1437 c.common.cdw13 = cpu_to_le32(cmd.cdw13);
1438 c.common.cdw14 = cpu_to_le32(cmd.cdw14);
1439 c.common.cdw15 = cpu_to_le32(cmd.cdw15);
1442 timeout = msecs_to_jiffies(cmd.timeout_ms);
1444 effects = nvme_passthru_start(ctrl, ns, cmd.opcode);
1445 status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
1446 nvme_to_user_ptr(cmd.addr), cmd.data_len,
1447 nvme_to_user_ptr(cmd.metadata), cmd.metadata_len,
1448 0, &result, timeout);
1449 nvme_passthru_end(ctrl, effects);
1452 if (put_user(result, &ucmd->result))
1459 static int nvme_user_cmd64(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
1460 struct nvme_passthru_cmd64 __user *ucmd)
1462 struct nvme_passthru_cmd64 cmd;
1463 struct nvme_command c;
1464 unsigned timeout = 0;
1468 if (!capable(CAP_SYS_ADMIN))
1470 if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
1475 memset(&c, 0, sizeof(c));
1476 c.common.opcode = cmd.opcode;
1477 c.common.flags = cmd.flags;
1478 c.common.nsid = cpu_to_le32(cmd.nsid);
1479 c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
1480 c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
1481 c.common.cdw10 = cpu_to_le32(cmd.cdw10);
1482 c.common.cdw11 = cpu_to_le32(cmd.cdw11);
1483 c.common.cdw12 = cpu_to_le32(cmd.cdw12);
1484 c.common.cdw13 = cpu_to_le32(cmd.cdw13);
1485 c.common.cdw14 = cpu_to_le32(cmd.cdw14);
1486 c.common.cdw15 = cpu_to_le32(cmd.cdw15);
1489 timeout = msecs_to_jiffies(cmd.timeout_ms);
1491 effects = nvme_passthru_start(ctrl, ns, cmd.opcode);
1492 status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
1493 nvme_to_user_ptr(cmd.addr), cmd.data_len,
1494 nvme_to_user_ptr(cmd.metadata), cmd.metadata_len,
1495 0, &cmd.result, timeout);
1496 nvme_passthru_end(ctrl, effects);
1499 if (put_user(cmd.result, &ucmd->result))
1507 * Issue ioctl requests on the first available path. Note that unlike normal
1508 * block layer requests we will not retry failed request on another controller.
1510 static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk,
1511 struct nvme_ns_head **head, int *srcu_idx)
1513 #ifdef CONFIG_NVME_MULTIPATH
1514 if (disk->fops == &nvme_ns_head_ops) {
1517 *head = disk->private_data;
1518 *srcu_idx = srcu_read_lock(&(*head)->srcu);
1519 ns = nvme_find_path(*head);
1521 srcu_read_unlock(&(*head)->srcu, *srcu_idx);
1527 return disk->private_data;
1530 static void nvme_put_ns_from_disk(struct nvme_ns_head *head, int idx)
1533 srcu_read_unlock(&head->srcu, idx);
1536 static bool is_ctrl_ioctl(unsigned int cmd)
1538 if (cmd == NVME_IOCTL_ADMIN_CMD || cmd == NVME_IOCTL_ADMIN64_CMD)
1540 if (is_sed_ioctl(cmd))
1545 static int nvme_handle_ctrl_ioctl(struct nvme_ns *ns, unsigned int cmd,
1547 struct nvme_ns_head *head,
1550 struct nvme_ctrl *ctrl = ns->ctrl;
1553 nvme_get_ctrl(ns->ctrl);
1554 nvme_put_ns_from_disk(head, srcu_idx);
1557 case NVME_IOCTL_ADMIN_CMD:
1558 ret = nvme_user_cmd(ctrl, NULL, argp);
1560 case NVME_IOCTL_ADMIN64_CMD:
1561 ret = nvme_user_cmd64(ctrl, NULL, argp);
1564 ret = sed_ioctl(ctrl->opal_dev, cmd, argp);
1567 nvme_put_ctrl(ctrl);
1571 static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
1572 unsigned int cmd, unsigned long arg)
1574 struct nvme_ns_head *head = NULL;
1575 void __user *argp = (void __user *)arg;
1579 ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx);
1581 return -EWOULDBLOCK;
1584 * Handle ioctls that apply to the controller instead of the namespace
1585 * seperately and drop the ns SRCU reference early. This avoids a
1586 * deadlock when deleting namespaces using the passthrough interface.
1588 if (is_ctrl_ioctl(cmd))
1589 return nvme_handle_ctrl_ioctl(ns, cmd, argp, head, srcu_idx);
1593 force_successful_syscall_return();
1594 ret = ns->head->ns_id;
1596 case NVME_IOCTL_IO_CMD:
1597 ret = nvme_user_cmd(ns->ctrl, ns, argp);
1599 case NVME_IOCTL_SUBMIT_IO:
1600 ret = nvme_submit_io(ns, argp);
1602 case NVME_IOCTL_IO64_CMD:
1603 ret = nvme_user_cmd64(ns->ctrl, ns, argp);
1607 ret = nvme_nvm_ioctl(ns, cmd, arg);
1612 nvme_put_ns_from_disk(head, srcu_idx);
1616 #ifdef CONFIG_COMPAT
1617 struct nvme_user_io32 {
1630 } __attribute__((__packed__));
1632 #define NVME_IOCTL_SUBMIT_IO32 _IOW('N', 0x42, struct nvme_user_io32)
1634 static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode,
1635 unsigned int cmd, unsigned long arg)
1638 * Corresponds to the difference of NVME_IOCTL_SUBMIT_IO
1639 * between 32 bit programs and 64 bit kernel.
1640 * The cause is that the results of sizeof(struct nvme_user_io),
1641 * which is used to define NVME_IOCTL_SUBMIT_IO,
1642 * are not same between 32 bit compiler and 64 bit compiler.
1643 * NVME_IOCTL_SUBMIT_IO32 is for 64 bit kernel handling
1644 * NVME_IOCTL_SUBMIT_IO issued from 32 bit programs.
1645 * Other IOCTL numbers are same between 32 bit and 64 bit.
1646 * So there is nothing to do regarding to other IOCTL numbers.
1648 if (cmd == NVME_IOCTL_SUBMIT_IO32)
1649 return nvme_ioctl(bdev, mode, NVME_IOCTL_SUBMIT_IO, arg);
1651 return nvme_ioctl(bdev, mode, cmd, arg);
1654 #define nvme_compat_ioctl NULL
1655 #endif /* CONFIG_COMPAT */
1657 static int nvme_open(struct block_device *bdev, fmode_t mode)
1659 struct nvme_ns *ns = bdev->bd_disk->private_data;
1661 #ifdef CONFIG_NVME_MULTIPATH
1662 /* should never be called due to GENHD_FL_HIDDEN */
1663 if (WARN_ON_ONCE(ns->head->disk))
1666 if (!kref_get_unless_zero(&ns->kref))
1668 if (!try_module_get(ns->ctrl->ops->module))
1679 static void nvme_release(struct gendisk *disk, fmode_t mode)
1681 struct nvme_ns *ns = disk->private_data;
1683 module_put(ns->ctrl->ops->module);
1687 static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1689 /* some standard values */
1690 geo->heads = 1 << 6;
1691 geo->sectors = 1 << 5;
1692 geo->cylinders = get_capacity(bdev->bd_disk) >> 11;
1696 #ifdef CONFIG_BLK_DEV_INTEGRITY
1697 static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type)
1699 struct blk_integrity integrity;
1701 memset(&integrity, 0, sizeof(integrity));
1703 case NVME_NS_DPS_PI_TYPE3:
1704 integrity.profile = &t10_pi_type3_crc;
1705 integrity.tag_size = sizeof(u16) + sizeof(u32);
1706 integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
1708 case NVME_NS_DPS_PI_TYPE1:
1709 case NVME_NS_DPS_PI_TYPE2:
1710 integrity.profile = &t10_pi_type1_crc;
1711 integrity.tag_size = sizeof(u16);
1712 integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
1715 integrity.profile = NULL;
1718 integrity.tuple_size = ms;
1719 blk_integrity_register(disk, &integrity);
1720 blk_queue_max_integrity_segments(disk->queue, 1);
1723 static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type)
1726 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1728 static void nvme_config_discard(struct gendisk *disk, struct nvme_ns *ns)
1730 struct nvme_ctrl *ctrl = ns->ctrl;
1731 struct request_queue *queue = disk->queue;
1732 u32 size = queue_logical_block_size(queue);
1734 if (!(ctrl->oncs & NVME_CTRL_ONCS_DSM)) {
1735 blk_queue_flag_clear(QUEUE_FLAG_DISCARD, queue);
1739 if (ctrl->nr_streams && ns->sws && ns->sgs)
1740 size *= ns->sws * ns->sgs;
1742 BUILD_BUG_ON(PAGE_SIZE / sizeof(struct nvme_dsm_range) <
1743 NVME_DSM_MAX_RANGES);
1745 queue->limits.discard_alignment = 0;
1746 queue->limits.discard_granularity = size;
1748 /* If discard is already enabled, don't reset queue limits */
1749 if (blk_queue_flag_test_and_set(QUEUE_FLAG_DISCARD, queue))
1752 blk_queue_max_discard_sectors(queue, UINT_MAX);
1753 blk_queue_max_discard_segments(queue, NVME_DSM_MAX_RANGES);
1755 if (ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
1756 blk_queue_max_write_zeroes_sectors(queue, UINT_MAX);
1759 static void nvme_config_write_zeroes(struct gendisk *disk, struct nvme_ns *ns)
1763 if (!(ns->ctrl->oncs & NVME_CTRL_ONCS_WRITE_ZEROES) ||
1764 (ns->ctrl->quirks & NVME_QUIRK_DISABLE_WRITE_ZEROES))
1767 * Even though NVMe spec explicitly states that MDTS is not
1768 * applicable to the write-zeroes:- "The restriction does not apply to
1769 * commands that do not transfer data between the host and the
1770 * controller (e.g., Write Uncorrectable ro Write Zeroes command).".
1771 * In order to be more cautious use controller's max_hw_sectors value
1772 * to configure the maximum sectors for the write-zeroes which is
1773 * configured based on the controller's MDTS field in the
1774 * nvme_init_identify() if available.
1776 if (ns->ctrl->max_hw_sectors == UINT_MAX)
1777 max_blocks = (u64)USHRT_MAX + 1;
1779 max_blocks = ns->ctrl->max_hw_sectors + 1;
1781 blk_queue_max_write_zeroes_sectors(disk->queue,
1782 nvme_lba_to_sect(ns, max_blocks));
1785 static int nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid,
1786 struct nvme_id_ns *id, struct nvme_ns_ids *ids)
1788 memset(ids, 0, sizeof(*ids));
1790 if (ctrl->vs >= NVME_VS(1, 1, 0))
1791 memcpy(ids->eui64, id->eui64, sizeof(id->eui64));
1792 if (ctrl->vs >= NVME_VS(1, 2, 0))
1793 memcpy(ids->nguid, id->nguid, sizeof(id->nguid));
1794 if (ctrl->vs >= NVME_VS(1, 3, 0))
1795 return nvme_identify_ns_descs(ctrl, nsid, ids);
1799 static bool nvme_ns_ids_valid(struct nvme_ns_ids *ids)
1801 return !uuid_is_null(&ids->uuid) ||
1802 memchr_inv(ids->nguid, 0, sizeof(ids->nguid)) ||
1803 memchr_inv(ids->eui64, 0, sizeof(ids->eui64));
1806 static bool nvme_ns_ids_equal(struct nvme_ns_ids *a, struct nvme_ns_ids *b)
1808 return uuid_equal(&a->uuid, &b->uuid) &&
1809 memcmp(&a->nguid, &b->nguid, sizeof(a->nguid)) == 0 &&
1810 memcmp(&a->eui64, &b->eui64, sizeof(a->eui64)) == 0;
1813 static void nvme_update_disk_info(struct gendisk *disk,
1814 struct nvme_ns *ns, struct nvme_id_ns *id)
1816 sector_t capacity = nvme_lba_to_sect(ns, le64_to_cpu(id->nsze));
1817 unsigned short bs = 1 << ns->lba_shift;
1818 u32 atomic_bs, phys_bs, io_opt;
1820 if (ns->lba_shift > PAGE_SHIFT) {
1821 /* unsupported block size, set capacity to 0 later */
1824 blk_mq_freeze_queue(disk->queue);
1825 blk_integrity_unregister(disk);
1827 if (id->nabo == 0) {
1829 * Bit 1 indicates whether NAWUPF is defined for this namespace
1830 * and whether it should be used instead of AWUPF. If NAWUPF ==
1831 * 0 then AWUPF must be used instead.
1833 if (id->nsfeat & (1 << 1) && id->nawupf)
1834 atomic_bs = (1 + le16_to_cpu(id->nawupf)) * bs;
1836 atomic_bs = (1 + ns->ctrl->subsys->awupf) * bs;
1842 if (id->nsfeat & (1 << 4)) {
1843 /* NPWG = Namespace Preferred Write Granularity */
1844 phys_bs *= 1 + le16_to_cpu(id->npwg);
1845 /* NOWS = Namespace Optimal Write Size */
1846 io_opt *= 1 + le16_to_cpu(id->nows);
1849 blk_queue_logical_block_size(disk->queue, bs);
1851 * Linux filesystems assume writing a single physical block is
1852 * an atomic operation. Hence limit the physical block size to the
1853 * value of the Atomic Write Unit Power Fail parameter.
1855 blk_queue_physical_block_size(disk->queue, min(phys_bs, atomic_bs));
1856 blk_queue_io_min(disk->queue, phys_bs);
1857 blk_queue_io_opt(disk->queue, io_opt);
1859 if (ns->ms && !ns->ext &&
1860 (ns->ctrl->ops->flags & NVME_F_METADATA_SUPPORTED))
1861 nvme_init_integrity(disk, ns->ms, ns->pi_type);
1862 if ((ns->ms && !nvme_ns_has_pi(ns) && !blk_get_integrity(disk)) ||
1863 ns->lba_shift > PAGE_SHIFT)
1866 set_capacity_revalidate_and_notify(disk, capacity, false);
1868 nvme_config_discard(disk, ns);
1869 nvme_config_write_zeroes(disk, ns);
1871 if (id->nsattr & (1 << 0))
1872 set_disk_ro(disk, true);
1874 set_disk_ro(disk, false);
1876 blk_mq_unfreeze_queue(disk->queue);
1879 static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
1881 struct nvme_ns *ns = disk->private_data;
1885 * If identify namespace failed, use default 512 byte block size so
1886 * block layer can use before failing read/write for 0 capacity.
1888 ns->lba_shift = id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ds;
1889 if (ns->lba_shift == 0)
1892 if ((ns->ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) &&
1893 is_power_of_2(ns->ctrl->max_hw_sectors))
1894 iob = ns->ctrl->max_hw_sectors;
1896 iob = nvme_lba_to_sect(ns, le16_to_cpu(id->noiob));
1898 ns->ms = le16_to_cpu(id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ms);
1899 ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT);
1900 /* the PI implementation requires metadata equal t10 pi tuple size */
1901 if (ns->ms == sizeof(struct t10_pi_tuple))
1902 ns->pi_type = id->dps & NVME_NS_DPS_PI_MASK;
1907 blk_queue_chunk_sectors(ns->queue, rounddown_pow_of_two(iob));
1908 nvme_update_disk_info(disk, ns, id);
1909 #ifdef CONFIG_NVME_MULTIPATH
1910 if (ns->head->disk) {
1911 nvme_update_disk_info(ns->head->disk, ns, id);
1912 blk_queue_stack_limits(ns->head->disk->queue, ns->queue);
1913 revalidate_disk(ns->head->disk);
1918 static int nvme_revalidate_disk(struct gendisk *disk)
1920 struct nvme_ns *ns = disk->private_data;
1921 struct nvme_ctrl *ctrl = ns->ctrl;
1922 struct nvme_id_ns *id;
1923 struct nvme_ns_ids ids;
1926 if (test_bit(NVME_NS_DEAD, &ns->flags)) {
1927 set_capacity(disk, 0);
1931 ret = nvme_identify_ns(ctrl, ns->head->ns_id, &id);
1935 if (id->ncap == 0) {
1940 ret = nvme_report_ns_ids(ctrl, ns->head->ns_id, id, &ids);
1944 if (!nvme_ns_ids_equal(&ns->head->ids, &ids)) {
1945 dev_err(ctrl->device,
1946 "identifiers changed for nsid %d\n", ns->head->ns_id);
1951 __nvme_revalidate_disk(disk, id);
1956 * Only fail the function if we got a fatal error back from the
1957 * device, otherwise ignore the error and just move on.
1959 if (ret == -ENOMEM || (ret > 0 && !(ret & NVME_SC_DNR)))
1962 ret = blk_status_to_errno(nvme_error_status(ret));
1966 static char nvme_pr_type(enum pr_type type)
1969 case PR_WRITE_EXCLUSIVE:
1971 case PR_EXCLUSIVE_ACCESS:
1973 case PR_WRITE_EXCLUSIVE_REG_ONLY:
1975 case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1977 case PR_WRITE_EXCLUSIVE_ALL_REGS:
1979 case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1986 static int nvme_pr_command(struct block_device *bdev, u32 cdw10,
1987 u64 key, u64 sa_key, u8 op)
1989 struct nvme_ns_head *head = NULL;
1991 struct nvme_command c;
1993 u8 data[16] = { 0, };
1995 ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx);
1997 return -EWOULDBLOCK;
1999 put_unaligned_le64(key, &data[0]);
2000 put_unaligned_le64(sa_key, &data[8]);
2002 memset(&c, 0, sizeof(c));
2003 c.common.opcode = op;
2004 c.common.nsid = cpu_to_le32(ns->head->ns_id);
2005 c.common.cdw10 = cpu_to_le32(cdw10);
2007 ret = nvme_submit_sync_cmd(ns->queue, &c, data, 16);
2008 nvme_put_ns_from_disk(head, srcu_idx);
2012 static int nvme_pr_register(struct block_device *bdev, u64 old,
2013 u64 new, unsigned flags)
2017 if (flags & ~PR_FL_IGNORE_KEY)
2020 cdw10 = old ? 2 : 0;
2021 cdw10 |= (flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0;
2022 cdw10 |= (1 << 30) | (1 << 31); /* PTPL=1 */
2023 return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_register);
2026 static int nvme_pr_reserve(struct block_device *bdev, u64 key,
2027 enum pr_type type, unsigned flags)
2031 if (flags & ~PR_FL_IGNORE_KEY)
2034 cdw10 = nvme_pr_type(type) << 8;
2035 cdw10 |= ((flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0);
2036 return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_acquire);
2039 static int nvme_pr_preempt(struct block_device *bdev, u64 old, u64 new,
2040 enum pr_type type, bool abort)
2042 u32 cdw10 = nvme_pr_type(type) << 8 | (abort ? 2 : 1);
2043 return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_acquire);
2046 static int nvme_pr_clear(struct block_device *bdev, u64 key)
2048 u32 cdw10 = 1 | (key ? 1 << 3 : 0);
2049 return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_register);
2052 static int nvme_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
2054 u32 cdw10 = nvme_pr_type(type) << 8 | (key ? 1 << 3 : 0);
2055 return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_release);
2058 static const struct pr_ops nvme_pr_ops = {
2059 .pr_register = nvme_pr_register,
2060 .pr_reserve = nvme_pr_reserve,
2061 .pr_release = nvme_pr_release,
2062 .pr_preempt = nvme_pr_preempt,
2063 .pr_clear = nvme_pr_clear,
2066 #ifdef CONFIG_BLK_SED_OPAL
2067 int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
2070 struct nvme_ctrl *ctrl = data;
2071 struct nvme_command cmd;
2073 memset(&cmd, 0, sizeof(cmd));
2075 cmd.common.opcode = nvme_admin_security_send;
2077 cmd.common.opcode = nvme_admin_security_recv;
2078 cmd.common.nsid = 0;
2079 cmd.common.cdw10 = cpu_to_le32(((u32)secp) << 24 | ((u32)spsp) << 8);
2080 cmd.common.cdw11 = cpu_to_le32(len);
2082 return __nvme_submit_sync_cmd(ctrl->admin_q, &cmd, NULL, buffer, len,
2083 ADMIN_TIMEOUT, NVME_QID_ANY, 1, 0, false);
2085 EXPORT_SYMBOL_GPL(nvme_sec_submit);
2086 #endif /* CONFIG_BLK_SED_OPAL */
2088 static const struct block_device_operations nvme_fops = {
2089 .owner = THIS_MODULE,
2090 .ioctl = nvme_ioctl,
2091 .compat_ioctl = nvme_compat_ioctl,
2093 .release = nvme_release,
2094 .getgeo = nvme_getgeo,
2095 .revalidate_disk= nvme_revalidate_disk,
2096 .pr_ops = &nvme_pr_ops,
2099 #ifdef CONFIG_NVME_MULTIPATH
2100 static int nvme_ns_head_open(struct block_device *bdev, fmode_t mode)
2102 struct nvme_ns_head *head = bdev->bd_disk->private_data;
2104 if (!kref_get_unless_zero(&head->ref))
2109 static void nvme_ns_head_release(struct gendisk *disk, fmode_t mode)
2111 nvme_put_ns_head(disk->private_data);
2114 const struct block_device_operations nvme_ns_head_ops = {
2115 .owner = THIS_MODULE,
2116 .open = nvme_ns_head_open,
2117 .release = nvme_ns_head_release,
2118 .ioctl = nvme_ioctl,
2119 .compat_ioctl = nvme_compat_ioctl,
2120 .getgeo = nvme_getgeo,
2121 .pr_ops = &nvme_pr_ops,
2123 #endif /* CONFIG_NVME_MULTIPATH */
2125 static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled)
2127 unsigned long timeout =
2128 ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
2129 u32 csts, bit = enabled ? NVME_CSTS_RDY : 0;
2132 while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
2135 if ((csts & NVME_CSTS_RDY) == bit)
2138 usleep_range(1000, 2000);
2139 if (fatal_signal_pending(current))
2141 if (time_after(jiffies, timeout)) {
2142 dev_err(ctrl->device,
2143 "Device not ready; aborting %s, CSTS=0x%x\n",
2144 enabled ? "initialisation" : "reset", csts);
2153 * If the device has been passed off to us in an enabled state, just clear
2154 * the enabled bit. The spec says we should set the 'shutdown notification
2155 * bits', but doing so may cause the device to complete commands to the
2156 * admin queue ... and we don't know what memory that might be pointing at!
2158 int nvme_disable_ctrl(struct nvme_ctrl *ctrl)
2162 ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
2163 ctrl->ctrl_config &= ~NVME_CC_ENABLE;
2165 ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
2169 if (ctrl->quirks & NVME_QUIRK_DELAY_BEFORE_CHK_RDY)
2170 msleep(NVME_QUIRK_DELAY_AMOUNT);
2172 return nvme_wait_ready(ctrl, ctrl->cap, false);
2174 EXPORT_SYMBOL_GPL(nvme_disable_ctrl);
2176 int nvme_enable_ctrl(struct nvme_ctrl *ctrl)
2179 * Default to a 4K page size, with the intention to update this
2180 * path in the future to accomodate architectures with differing
2181 * kernel and IO page sizes.
2183 unsigned dev_page_min, page_shift = 12;
2186 ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &ctrl->cap);
2188 dev_err(ctrl->device, "Reading CAP failed (%d)\n", ret);
2191 dev_page_min = NVME_CAP_MPSMIN(ctrl->cap) + 12;
2193 if (page_shift < dev_page_min) {
2194 dev_err(ctrl->device,
2195 "Minimum device page size %u too large for host (%u)\n",
2196 1 << dev_page_min, 1 << page_shift);
2200 ctrl->page_size = 1 << page_shift;
2202 ctrl->ctrl_config = NVME_CC_CSS_NVM;
2203 ctrl->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT;
2204 ctrl->ctrl_config |= NVME_CC_AMS_RR | NVME_CC_SHN_NONE;
2205 ctrl->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;
2206 ctrl->ctrl_config |= NVME_CC_ENABLE;
2208 ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
2211 return nvme_wait_ready(ctrl, ctrl->cap, true);
2213 EXPORT_SYMBOL_GPL(nvme_enable_ctrl);
2215 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
2217 unsigned long timeout = jiffies + (ctrl->shutdown_timeout * HZ);
2221 ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
2222 ctrl->ctrl_config |= NVME_CC_SHN_NORMAL;
2224 ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
2228 while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
2229 if ((csts & NVME_CSTS_SHST_MASK) == NVME_CSTS_SHST_CMPLT)
2233 if (fatal_signal_pending(current))
2235 if (time_after(jiffies, timeout)) {
2236 dev_err(ctrl->device,
2237 "Device shutdown incomplete; abort shutdown\n");
2244 EXPORT_SYMBOL_GPL(nvme_shutdown_ctrl);
2246 static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
2247 struct request_queue *q)
2251 if (ctrl->max_hw_sectors) {
2253 (ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1;
2255 max_segments = min_not_zero(max_segments, ctrl->max_segments);
2256 blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
2257 blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
2259 blk_queue_virt_boundary(q, ctrl->page_size - 1);
2260 if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
2262 blk_queue_write_cache(q, vwc, vwc);
2265 static int nvme_configure_timestamp(struct nvme_ctrl *ctrl)
2270 if (!(ctrl->oncs & NVME_CTRL_ONCS_TIMESTAMP))
2273 ts = cpu_to_le64(ktime_to_ms(ktime_get_real()));
2274 ret = nvme_set_features(ctrl, NVME_FEAT_TIMESTAMP, 0, &ts, sizeof(ts),
2277 dev_warn_once(ctrl->device,
2278 "could not set timestamp (%d)\n", ret);
2282 static int nvme_configure_acre(struct nvme_ctrl *ctrl)
2284 struct nvme_feat_host_behavior *host;
2287 /* Don't bother enabling the feature if retry delay is not reported */
2291 host = kzalloc(sizeof(*host), GFP_KERNEL);
2295 host->acre = NVME_ENABLE_ACRE;
2296 ret = nvme_set_features(ctrl, NVME_FEAT_HOST_BEHAVIOR, 0,
2297 host, sizeof(*host), NULL);
2302 static int nvme_configure_apst(struct nvme_ctrl *ctrl)
2305 * APST (Autonomous Power State Transition) lets us program a
2306 * table of power state transitions that the controller will
2307 * perform automatically. We configure it with a simple
2308 * heuristic: we are willing to spend at most 2% of the time
2309 * transitioning between power states. Therefore, when running
2310 * in any given state, we will enter the next lower-power
2311 * non-operational state after waiting 50 * (enlat + exlat)
2312 * microseconds, as long as that state's exit latency is under
2313 * the requested maximum latency.
2315 * We will not autonomously enter any non-operational state for
2316 * which the total latency exceeds ps_max_latency_us. Users
2317 * can set ps_max_latency_us to zero to turn off APST.
2321 struct nvme_feat_auto_pst *table;
2327 * If APST isn't supported or if we haven't been initialized yet,
2328 * then don't do anything.
2333 if (ctrl->npss > 31) {
2334 dev_warn(ctrl->device, "NPSS is invalid; not using APST\n");
2338 table = kzalloc(sizeof(*table), GFP_KERNEL);
2342 if (!ctrl->apst_enabled || ctrl->ps_max_latency_us == 0) {
2343 /* Turn off APST. */
2345 dev_dbg(ctrl->device, "APST disabled\n");
2347 __le64 target = cpu_to_le64(0);
2351 * Walk through all states from lowest- to highest-power.
2352 * According to the spec, lower-numbered states use more
2353 * power. NPSS, despite the name, is the index of the
2354 * lowest-power state, not the number of states.
2356 for (state = (int)ctrl->npss; state >= 0; state--) {
2357 u64 total_latency_us, exit_latency_us, transition_ms;
2360 table->entries[state] = target;
2363 * Don't allow transitions to the deepest state
2364 * if it's quirked off.
2366 if (state == ctrl->npss &&
2367 (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS))
2371 * Is this state a useful non-operational state for
2372 * higher-power states to autonomously transition to?
2374 if (!(ctrl->psd[state].flags &
2375 NVME_PS_FLAGS_NON_OP_STATE))
2379 (u64)le32_to_cpu(ctrl->psd[state].exit_lat);
2380 if (exit_latency_us > ctrl->ps_max_latency_us)
2385 le32_to_cpu(ctrl->psd[state].entry_lat);
2388 * This state is good. Use it as the APST idle
2389 * target for higher power states.
2391 transition_ms = total_latency_us + 19;
2392 do_div(transition_ms, 20);
2393 if (transition_ms > (1 << 24) - 1)
2394 transition_ms = (1 << 24) - 1;
2396 target = cpu_to_le64((state << 3) |
2397 (transition_ms << 8));
2402 if (total_latency_us > max_lat_us)
2403 max_lat_us = total_latency_us;
2409 dev_dbg(ctrl->device, "APST enabled but no non-operational states are available\n");
2411 dev_dbg(ctrl->device, "APST enabled: max PS = %d, max round-trip latency = %lluus, table = %*phN\n",
2412 max_ps, max_lat_us, (int)sizeof(*table), table);
2416 ret = nvme_set_features(ctrl, NVME_FEAT_AUTO_PST, apste,
2417 table, sizeof(*table), NULL);
2419 dev_err(ctrl->device, "failed to set APST feature (%d)\n", ret);
2425 static void nvme_set_latency_tolerance(struct device *dev, s32 val)
2427 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
2431 case PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT:
2432 case PM_QOS_LATENCY_ANY:
2440 if (ctrl->ps_max_latency_us != latency) {
2441 ctrl->ps_max_latency_us = latency;
2442 nvme_configure_apst(ctrl);
2446 struct nvme_core_quirk_entry {
2448 * NVMe model and firmware strings are padded with spaces. For
2449 * simplicity, strings in the quirk table are padded with NULLs
2455 unsigned long quirks;
2458 static const struct nvme_core_quirk_entry core_quirks[] = {
2461 * This Toshiba device seems to die using any APST states. See:
2462 * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1678184/comments/11
2465 .mn = "THNSF5256GPUK TOSHIBA",
2466 .quirks = NVME_QUIRK_NO_APST,
2470 * This LiteON CL1-3D*-Q11 firmware version has a race
2471 * condition associated with actions related to suspend to idle
2472 * LiteON has resolved the problem in future firmware
2476 .quirks = NVME_QUIRK_SIMPLE_SUSPEND,
2480 /* match is null-terminated but idstr is space-padded. */
2481 static bool string_matches(const char *idstr, const char *match, size_t len)
2488 matchlen = strlen(match);
2489 WARN_ON_ONCE(matchlen > len);
2491 if (memcmp(idstr, match, matchlen))
2494 for (; matchlen < len; matchlen++)
2495 if (idstr[matchlen] != ' ')
2501 static bool quirk_matches(const struct nvme_id_ctrl *id,
2502 const struct nvme_core_quirk_entry *q)
2504 return q->vid == le16_to_cpu(id->vid) &&
2505 string_matches(id->mn, q->mn, sizeof(id->mn)) &&
2506 string_matches(id->fr, q->fr, sizeof(id->fr));
2509 static void nvme_init_subnqn(struct nvme_subsystem *subsys, struct nvme_ctrl *ctrl,
2510 struct nvme_id_ctrl *id)
2515 if(!(ctrl->quirks & NVME_QUIRK_IGNORE_DEV_SUBNQN)) {
2516 nqnlen = strnlen(id->subnqn, NVMF_NQN_SIZE);
2517 if (nqnlen > 0 && nqnlen < NVMF_NQN_SIZE) {
2518 strlcpy(subsys->subnqn, id->subnqn, NVMF_NQN_SIZE);
2522 if (ctrl->vs >= NVME_VS(1, 2, 1))
2523 dev_warn(ctrl->device, "missing or invalid SUBNQN field.\n");
2526 /* Generate a "fake" NQN per Figure 254 in NVMe 1.3 + ECN 001 */
2527 off = snprintf(subsys->subnqn, NVMF_NQN_SIZE,
2528 "nqn.2014.08.org.nvmexpress:%04x%04x",
2529 le16_to_cpu(id->vid), le16_to_cpu(id->ssvid));
2530 memcpy(subsys->subnqn + off, id->sn, sizeof(id->sn));
2531 off += sizeof(id->sn);
2532 memcpy(subsys->subnqn + off, id->mn, sizeof(id->mn));
2533 off += sizeof(id->mn);
2534 memset(subsys->subnqn + off, 0, sizeof(subsys->subnqn) - off);
2537 static void nvme_release_subsystem(struct device *dev)
2539 struct nvme_subsystem *subsys =
2540 container_of(dev, struct nvme_subsystem, dev);
2542 if (subsys->instance >= 0)
2543 ida_simple_remove(&nvme_instance_ida, subsys->instance);
2547 static void nvme_destroy_subsystem(struct kref *ref)
2549 struct nvme_subsystem *subsys =
2550 container_of(ref, struct nvme_subsystem, ref);
2552 mutex_lock(&nvme_subsystems_lock);
2553 list_del(&subsys->entry);
2554 mutex_unlock(&nvme_subsystems_lock);
2556 ida_destroy(&subsys->ns_ida);
2557 device_del(&subsys->dev);
2558 put_device(&subsys->dev);
2561 static void nvme_put_subsystem(struct nvme_subsystem *subsys)
2563 kref_put(&subsys->ref, nvme_destroy_subsystem);
2566 static struct nvme_subsystem *__nvme_find_get_subsystem(const char *subsysnqn)
2568 struct nvme_subsystem *subsys;
2570 lockdep_assert_held(&nvme_subsystems_lock);
2573 * Fail matches for discovery subsystems. This results
2574 * in each discovery controller bound to a unique subsystem.
2575 * This avoids issues with validating controller values
2576 * that can only be true when there is a single unique subsystem.
2577 * There may be multiple and completely independent entities
2578 * that provide discovery controllers.
2580 if (!strcmp(subsysnqn, NVME_DISC_SUBSYS_NAME))
2583 list_for_each_entry(subsys, &nvme_subsystems, entry) {
2584 if (strcmp(subsys->subnqn, subsysnqn))
2586 if (!kref_get_unless_zero(&subsys->ref))
2594 #define SUBSYS_ATTR_RO(_name, _mode, _show) \
2595 struct device_attribute subsys_attr_##_name = \
2596 __ATTR(_name, _mode, _show, NULL)
2598 static ssize_t nvme_subsys_show_nqn(struct device *dev,
2599 struct device_attribute *attr,
2602 struct nvme_subsystem *subsys =
2603 container_of(dev, struct nvme_subsystem, dev);
2605 return snprintf(buf, PAGE_SIZE, "%s\n", subsys->subnqn);
2607 static SUBSYS_ATTR_RO(subsysnqn, S_IRUGO, nvme_subsys_show_nqn);
2609 #define nvme_subsys_show_str_function(field) \
2610 static ssize_t subsys_##field##_show(struct device *dev, \
2611 struct device_attribute *attr, char *buf) \
2613 struct nvme_subsystem *subsys = \
2614 container_of(dev, struct nvme_subsystem, dev); \
2615 return sprintf(buf, "%.*s\n", \
2616 (int)sizeof(subsys->field), subsys->field); \
2618 static SUBSYS_ATTR_RO(field, S_IRUGO, subsys_##field##_show);
2620 nvme_subsys_show_str_function(model);
2621 nvme_subsys_show_str_function(serial);
2622 nvme_subsys_show_str_function(firmware_rev);
2624 static struct attribute *nvme_subsys_attrs[] = {
2625 &subsys_attr_model.attr,
2626 &subsys_attr_serial.attr,
2627 &subsys_attr_firmware_rev.attr,
2628 &subsys_attr_subsysnqn.attr,
2629 #ifdef CONFIG_NVME_MULTIPATH
2630 &subsys_attr_iopolicy.attr,
2635 static struct attribute_group nvme_subsys_attrs_group = {
2636 .attrs = nvme_subsys_attrs,
2639 static const struct attribute_group *nvme_subsys_attrs_groups[] = {
2640 &nvme_subsys_attrs_group,
2644 static bool nvme_validate_cntlid(struct nvme_subsystem *subsys,
2645 struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
2647 struct nvme_ctrl *tmp;
2649 lockdep_assert_held(&nvme_subsystems_lock);
2651 list_for_each_entry(tmp, &subsys->ctrls, subsys_entry) {
2652 if (nvme_state_terminal(tmp))
2655 if (tmp->cntlid == ctrl->cntlid) {
2656 dev_err(ctrl->device,
2657 "Duplicate cntlid %u with %s, rejecting\n",
2658 ctrl->cntlid, dev_name(tmp->device));
2662 if ((id->cmic & (1 << 1)) ||
2663 (ctrl->opts && ctrl->opts->discovery_nqn))
2666 dev_err(ctrl->device,
2667 "Subsystem does not support multiple controllers\n");
2674 static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
2676 struct nvme_subsystem *subsys, *found;
2679 subsys = kzalloc(sizeof(*subsys), GFP_KERNEL);
2683 subsys->instance = -1;
2684 mutex_init(&subsys->lock);
2685 kref_init(&subsys->ref);
2686 INIT_LIST_HEAD(&subsys->ctrls);
2687 INIT_LIST_HEAD(&subsys->nsheads);
2688 nvme_init_subnqn(subsys, ctrl, id);
2689 memcpy(subsys->serial, id->sn, sizeof(subsys->serial));
2690 memcpy(subsys->model, id->mn, sizeof(subsys->model));
2691 memcpy(subsys->firmware_rev, id->fr, sizeof(subsys->firmware_rev));
2692 subsys->vendor_id = le16_to_cpu(id->vid);
2693 subsys->cmic = id->cmic;
2694 subsys->awupf = le16_to_cpu(id->awupf);
2695 #ifdef CONFIG_NVME_MULTIPATH
2696 subsys->iopolicy = NVME_IOPOLICY_NUMA;
2699 subsys->dev.class = nvme_subsys_class;
2700 subsys->dev.release = nvme_release_subsystem;
2701 subsys->dev.groups = nvme_subsys_attrs_groups;
2702 dev_set_name(&subsys->dev, "nvme-subsys%d", ctrl->instance);
2703 device_initialize(&subsys->dev);
2705 mutex_lock(&nvme_subsystems_lock);
2706 found = __nvme_find_get_subsystem(subsys->subnqn);
2708 put_device(&subsys->dev);
2711 if (!nvme_validate_cntlid(subsys, ctrl, id)) {
2713 goto out_put_subsystem;
2716 ret = device_add(&subsys->dev);
2718 dev_err(ctrl->device,
2719 "failed to register subsystem device.\n");
2720 put_device(&subsys->dev);
2723 ida_init(&subsys->ns_ida);
2724 list_add_tail(&subsys->entry, &nvme_subsystems);
2727 ret = sysfs_create_link(&subsys->dev.kobj, &ctrl->device->kobj,
2728 dev_name(ctrl->device));
2730 dev_err(ctrl->device,
2731 "failed to create sysfs link from subsystem.\n");
2732 goto out_put_subsystem;
2736 subsys->instance = ctrl->instance;
2737 ctrl->subsys = subsys;
2738 list_add_tail(&ctrl->subsys_entry, &subsys->ctrls);
2739 mutex_unlock(&nvme_subsystems_lock);
2743 nvme_put_subsystem(subsys);
2745 mutex_unlock(&nvme_subsystems_lock);
2749 int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp,
2750 void *log, size_t size, u64 offset)
2752 struct nvme_command c = { };
2753 u32 dwlen = nvme_bytes_to_numd(size);
2755 c.get_log_page.opcode = nvme_admin_get_log_page;
2756 c.get_log_page.nsid = cpu_to_le32(nsid);
2757 c.get_log_page.lid = log_page;
2758 c.get_log_page.lsp = lsp;
2759 c.get_log_page.numdl = cpu_to_le16(dwlen & ((1 << 16) - 1));
2760 c.get_log_page.numdu = cpu_to_le16(dwlen >> 16);
2761 c.get_log_page.lpol = cpu_to_le32(lower_32_bits(offset));
2762 c.get_log_page.lpou = cpu_to_le32(upper_32_bits(offset));
2764 return nvme_submit_sync_cmd(ctrl->admin_q, &c, log, size);
2767 static int nvme_get_effects_log(struct nvme_ctrl *ctrl)
2772 ctrl->effects = kzalloc(sizeof(*ctrl->effects), GFP_KERNEL);
2777 ret = nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_CMD_EFFECTS, 0,
2778 ctrl->effects, sizeof(*ctrl->effects), 0);
2780 kfree(ctrl->effects);
2781 ctrl->effects = NULL;
2787 * Initialize the cached copies of the Identify data and various controller
2788 * register in our nvme_ctrl structure. This should be called as soon as
2789 * the admin queue is fully up and running.
2791 int nvme_init_identify(struct nvme_ctrl *ctrl)
2793 struct nvme_id_ctrl *id;
2794 int ret, page_shift;
2796 bool prev_apst_enabled;
2798 ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs);
2800 dev_err(ctrl->device, "Reading VS failed (%d)\n", ret);
2803 page_shift = NVME_CAP_MPSMIN(ctrl->cap) + 12;
2804 ctrl->sqsize = min_t(int, NVME_CAP_MQES(ctrl->cap), ctrl->sqsize);
2806 if (ctrl->vs >= NVME_VS(1, 1, 0))
2807 ctrl->subsystem = NVME_CAP_NSSRC(ctrl->cap);
2809 ret = nvme_identify_ctrl(ctrl, &id);
2811 dev_err(ctrl->device, "Identify Controller failed (%d)\n", ret);
2815 if (id->lpa & NVME_CTRL_LPA_CMD_EFFECTS_LOG) {
2816 ret = nvme_get_effects_log(ctrl);
2821 if (!(ctrl->ops->flags & NVME_F_FABRICS))
2822 ctrl->cntlid = le16_to_cpu(id->cntlid);
2824 if (!ctrl->identified) {
2827 ret = nvme_init_subsystem(ctrl, id);
2832 * Check for quirks. Quirk can depend on firmware version,
2833 * so, in principle, the set of quirks present can change
2834 * across a reset. As a possible future enhancement, we
2835 * could re-scan for quirks every time we reinitialize
2836 * the device, but we'd have to make sure that the driver
2837 * behaves intelligently if the quirks change.
2839 for (i = 0; i < ARRAY_SIZE(core_quirks); i++) {
2840 if (quirk_matches(id, &core_quirks[i]))
2841 ctrl->quirks |= core_quirks[i].quirks;
2845 if (force_apst && (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS)) {
2846 dev_warn(ctrl->device, "forcibly allowing all power states due to nvme_core.force_apst -- use at your own risk\n");
2847 ctrl->quirks &= ~NVME_QUIRK_NO_DEEPEST_PS;
2850 ctrl->crdt[0] = le16_to_cpu(id->crdt1);
2851 ctrl->crdt[1] = le16_to_cpu(id->crdt2);
2852 ctrl->crdt[2] = le16_to_cpu(id->crdt3);
2854 ctrl->oacs = le16_to_cpu(id->oacs);
2855 ctrl->oncs = le16_to_cpu(id->oncs);
2856 ctrl->mtfa = le16_to_cpu(id->mtfa);
2857 ctrl->oaes = le32_to_cpu(id->oaes);
2858 ctrl->wctemp = le16_to_cpu(id->wctemp);
2859 ctrl->cctemp = le16_to_cpu(id->cctemp);
2861 atomic_set(&ctrl->abort_limit, id->acl + 1);
2862 ctrl->vwc = id->vwc;
2864 max_hw_sectors = 1 << (id->mdts + page_shift - 9);
2866 max_hw_sectors = UINT_MAX;
2867 ctrl->max_hw_sectors =
2868 min_not_zero(ctrl->max_hw_sectors, max_hw_sectors);
2870 nvme_set_queue_limits(ctrl, ctrl->admin_q);
2871 ctrl->sgls = le32_to_cpu(id->sgls);
2872 ctrl->kas = le16_to_cpu(id->kas);
2873 ctrl->max_namespaces = le32_to_cpu(id->mnan);
2874 ctrl->ctratt = le32_to_cpu(id->ctratt);
2878 u32 transition_time = le32_to_cpu(id->rtd3e) / 1000000;
2880 ctrl->shutdown_timeout = clamp_t(unsigned int, transition_time,
2881 shutdown_timeout, 60);
2883 if (ctrl->shutdown_timeout != shutdown_timeout)
2884 dev_info(ctrl->device,
2885 "Shutdown timeout set to %u seconds\n",
2886 ctrl->shutdown_timeout);
2888 ctrl->shutdown_timeout = shutdown_timeout;
2890 ctrl->npss = id->npss;
2891 ctrl->apsta = id->apsta;
2892 prev_apst_enabled = ctrl->apst_enabled;
2893 if (ctrl->quirks & NVME_QUIRK_NO_APST) {
2894 if (force_apst && id->apsta) {
2895 dev_warn(ctrl->device, "forcibly allowing APST due to nvme_core.force_apst -- use at your own risk\n");
2896 ctrl->apst_enabled = true;
2898 ctrl->apst_enabled = false;
2901 ctrl->apst_enabled = id->apsta;
2903 memcpy(ctrl->psd, id->psd, sizeof(ctrl->psd));
2905 if (ctrl->ops->flags & NVME_F_FABRICS) {
2906 ctrl->icdoff = le16_to_cpu(id->icdoff);
2907 ctrl->ioccsz = le32_to_cpu(id->ioccsz);
2908 ctrl->iorcsz = le32_to_cpu(id->iorcsz);
2909 ctrl->maxcmd = le16_to_cpu(id->maxcmd);
2912 * In fabrics we need to verify the cntlid matches the
2915 if (ctrl->cntlid != le16_to_cpu(id->cntlid)) {
2916 dev_err(ctrl->device,
2917 "Mismatching cntlid: Connect %u vs Identify "
2919 ctrl->cntlid, le16_to_cpu(id->cntlid));
2924 if (!ctrl->opts->discovery_nqn && !ctrl->kas) {
2925 dev_err(ctrl->device,
2926 "keep-alive support is mandatory for fabrics\n");
2931 ctrl->hmpre = le32_to_cpu(id->hmpre);
2932 ctrl->hmmin = le32_to_cpu(id->hmmin);
2933 ctrl->hmminds = le32_to_cpu(id->hmminds);
2934 ctrl->hmmaxd = le16_to_cpu(id->hmmaxd);
2937 ret = nvme_mpath_init(ctrl, id);
2943 if (ctrl->apst_enabled && !prev_apst_enabled)
2944 dev_pm_qos_expose_latency_tolerance(ctrl->device);
2945 else if (!ctrl->apst_enabled && prev_apst_enabled)
2946 dev_pm_qos_hide_latency_tolerance(ctrl->device);
2948 ret = nvme_configure_apst(ctrl);
2952 ret = nvme_configure_timestamp(ctrl);
2956 ret = nvme_configure_directives(ctrl);
2960 ret = nvme_configure_acre(ctrl);
2964 if (!ctrl->identified)
2965 nvme_hwmon_init(ctrl);
2967 ctrl->identified = true;
2975 EXPORT_SYMBOL_GPL(nvme_init_identify);
2977 static int nvme_dev_open(struct inode *inode, struct file *file)
2979 struct nvme_ctrl *ctrl =
2980 container_of(inode->i_cdev, struct nvme_ctrl, cdev);
2982 switch (ctrl->state) {
2983 case NVME_CTRL_LIVE:
2986 return -EWOULDBLOCK;
2989 file->private_data = ctrl;
2993 static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp)
2998 down_read(&ctrl->namespaces_rwsem);
2999 if (list_empty(&ctrl->namespaces)) {
3004 ns = list_first_entry(&ctrl->namespaces, struct nvme_ns, list);
3005 if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) {
3006 dev_warn(ctrl->device,
3007 "NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n");
3012 dev_warn(ctrl->device,
3013 "using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n");
3014 kref_get(&ns->kref);
3015 up_read(&ctrl->namespaces_rwsem);
3017 ret = nvme_user_cmd(ctrl, ns, argp);
3022 up_read(&ctrl->namespaces_rwsem);
3026 static long nvme_dev_ioctl(struct file *file, unsigned int cmd,
3029 struct nvme_ctrl *ctrl = file->private_data;
3030 void __user *argp = (void __user *)arg;
3033 case NVME_IOCTL_ADMIN_CMD:
3034 return nvme_user_cmd(ctrl, NULL, argp);
3035 case NVME_IOCTL_ADMIN64_CMD:
3036 return nvme_user_cmd64(ctrl, NULL, argp);
3037 case NVME_IOCTL_IO_CMD:
3038 return nvme_dev_user_cmd(ctrl, argp);
3039 case NVME_IOCTL_RESET:
3040 dev_warn(ctrl->device, "resetting controller\n");
3041 return nvme_reset_ctrl_sync(ctrl);
3042 case NVME_IOCTL_SUBSYS_RESET:
3043 return nvme_reset_subsystem(ctrl);
3044 case NVME_IOCTL_RESCAN:
3045 nvme_queue_scan(ctrl);
3052 static const struct file_operations nvme_dev_fops = {
3053 .owner = THIS_MODULE,
3054 .open = nvme_dev_open,
3055 .unlocked_ioctl = nvme_dev_ioctl,
3056 .compat_ioctl = compat_ptr_ioctl,
3059 static ssize_t nvme_sysfs_reset(struct device *dev,
3060 struct device_attribute *attr, const char *buf,
3063 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3066 ret = nvme_reset_ctrl_sync(ctrl);
3071 static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset);
3073 static ssize_t nvme_sysfs_rescan(struct device *dev,
3074 struct device_attribute *attr, const char *buf,
3077 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3079 nvme_queue_scan(ctrl);
3082 static DEVICE_ATTR(rescan_controller, S_IWUSR, NULL, nvme_sysfs_rescan);
3084 static inline struct nvme_ns_head *dev_to_ns_head(struct device *dev)
3086 struct gendisk *disk = dev_to_disk(dev);
3088 if (disk->fops == &nvme_fops)
3089 return nvme_get_ns_from_dev(dev)->head;
3091 return disk->private_data;
3094 static ssize_t wwid_show(struct device *dev, struct device_attribute *attr,
3097 struct nvme_ns_head *head = dev_to_ns_head(dev);
3098 struct nvme_ns_ids *ids = &head->ids;
3099 struct nvme_subsystem *subsys = head->subsys;
3100 int serial_len = sizeof(subsys->serial);
3101 int model_len = sizeof(subsys->model);
3103 if (!uuid_is_null(&ids->uuid))
3104 return sprintf(buf, "uuid.%pU\n", &ids->uuid);
3106 if (memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
3107 return sprintf(buf, "eui.%16phN\n", ids->nguid);
3109 if (memchr_inv(ids->eui64, 0, sizeof(ids->eui64)))
3110 return sprintf(buf, "eui.%8phN\n", ids->eui64);
3112 while (serial_len > 0 && (subsys->serial[serial_len - 1] == ' ' ||
3113 subsys->serial[serial_len - 1] == '\0'))
3115 while (model_len > 0 && (subsys->model[model_len - 1] == ' ' ||
3116 subsys->model[model_len - 1] == '\0'))
3119 return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", subsys->vendor_id,
3120 serial_len, subsys->serial, model_len, subsys->model,
3123 static DEVICE_ATTR_RO(wwid);
3125 static ssize_t nguid_show(struct device *dev, struct device_attribute *attr,
3128 return sprintf(buf, "%pU\n", dev_to_ns_head(dev)->ids.nguid);
3130 static DEVICE_ATTR_RO(nguid);
3132 static ssize_t uuid_show(struct device *dev, struct device_attribute *attr,
3135 struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids;
3137 /* For backward compatibility expose the NGUID to userspace if
3138 * we have no UUID set
3140 if (uuid_is_null(&ids->uuid)) {
3141 printk_ratelimited(KERN_WARNING
3142 "No UUID available providing old NGUID\n");
3143 return sprintf(buf, "%pU\n", ids->nguid);
3145 return sprintf(buf, "%pU\n", &ids->uuid);
3147 static DEVICE_ATTR_RO(uuid);
3149 static ssize_t eui_show(struct device *dev, struct device_attribute *attr,
3152 return sprintf(buf, "%8ph\n", dev_to_ns_head(dev)->ids.eui64);
3154 static DEVICE_ATTR_RO(eui);
3156 static ssize_t nsid_show(struct device *dev, struct device_attribute *attr,
3159 return sprintf(buf, "%d\n", dev_to_ns_head(dev)->ns_id);
3161 static DEVICE_ATTR_RO(nsid);
3163 static struct attribute *nvme_ns_id_attrs[] = {
3164 &dev_attr_wwid.attr,
3165 &dev_attr_uuid.attr,
3166 &dev_attr_nguid.attr,
3168 &dev_attr_nsid.attr,
3169 #ifdef CONFIG_NVME_MULTIPATH
3170 &dev_attr_ana_grpid.attr,
3171 &dev_attr_ana_state.attr,
3176 static umode_t nvme_ns_id_attrs_are_visible(struct kobject *kobj,
3177 struct attribute *a, int n)
3179 struct device *dev = container_of(kobj, struct device, kobj);
3180 struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids;
3182 if (a == &dev_attr_uuid.attr) {
3183 if (uuid_is_null(&ids->uuid) &&
3184 !memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
3187 if (a == &dev_attr_nguid.attr) {
3188 if (!memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
3191 if (a == &dev_attr_eui.attr) {
3192 if (!memchr_inv(ids->eui64, 0, sizeof(ids->eui64)))
3195 #ifdef CONFIG_NVME_MULTIPATH
3196 if (a == &dev_attr_ana_grpid.attr || a == &dev_attr_ana_state.attr) {
3197 if (dev_to_disk(dev)->fops != &nvme_fops) /* per-path attr */
3199 if (!nvme_ctrl_use_ana(nvme_get_ns_from_dev(dev)->ctrl))
3206 static const struct attribute_group nvme_ns_id_attr_group = {
3207 .attrs = nvme_ns_id_attrs,
3208 .is_visible = nvme_ns_id_attrs_are_visible,
3211 const struct attribute_group *nvme_ns_id_attr_groups[] = {
3212 &nvme_ns_id_attr_group,
3214 &nvme_nvm_attr_group,
3219 #define nvme_show_str_function(field) \
3220 static ssize_t field##_show(struct device *dev, \
3221 struct device_attribute *attr, char *buf) \
3223 struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \
3224 return sprintf(buf, "%.*s\n", \
3225 (int)sizeof(ctrl->subsys->field), ctrl->subsys->field); \
3227 static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
3229 nvme_show_str_function(model);
3230 nvme_show_str_function(serial);
3231 nvme_show_str_function(firmware_rev);
3233 #define nvme_show_int_function(field) \
3234 static ssize_t field##_show(struct device *dev, \
3235 struct device_attribute *attr, char *buf) \
3237 struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \
3238 return sprintf(buf, "%d\n", ctrl->field); \
3240 static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
3242 nvme_show_int_function(cntlid);
3243 nvme_show_int_function(numa_node);
3244 nvme_show_int_function(queue_count);
3245 nvme_show_int_function(sqsize);
3247 static ssize_t nvme_sysfs_delete(struct device *dev,
3248 struct device_attribute *attr, const char *buf,
3251 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3253 /* Can't delete non-created controllers */
3257 if (device_remove_file_self(dev, attr))
3258 nvme_delete_ctrl_sync(ctrl);
3261 static DEVICE_ATTR(delete_controller, S_IWUSR, NULL, nvme_sysfs_delete);
3263 static ssize_t nvme_sysfs_show_transport(struct device *dev,
3264 struct device_attribute *attr,
3267 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3269 return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->ops->name);
3271 static DEVICE_ATTR(transport, S_IRUGO, nvme_sysfs_show_transport, NULL);
3273 static ssize_t nvme_sysfs_show_state(struct device *dev,
3274 struct device_attribute *attr,
3277 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3278 static const char *const state_name[] = {
3279 [NVME_CTRL_NEW] = "new",
3280 [NVME_CTRL_LIVE] = "live",
3281 [NVME_CTRL_RESETTING] = "resetting",
3282 [NVME_CTRL_CONNECTING] = "connecting",
3283 [NVME_CTRL_DELETING] = "deleting",
3284 [NVME_CTRL_DEAD] = "dead",
3287 if ((unsigned)ctrl->state < ARRAY_SIZE(state_name) &&
3288 state_name[ctrl->state])
3289 return sprintf(buf, "%s\n", state_name[ctrl->state]);
3291 return sprintf(buf, "unknown state\n");
3294 static DEVICE_ATTR(state, S_IRUGO, nvme_sysfs_show_state, NULL);
3296 static ssize_t nvme_sysfs_show_subsysnqn(struct device *dev,
3297 struct device_attribute *attr,
3300 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3302 return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->subsys->subnqn);
3304 static DEVICE_ATTR(subsysnqn, S_IRUGO, nvme_sysfs_show_subsysnqn, NULL);
3306 static ssize_t nvme_sysfs_show_hostnqn(struct device *dev,
3307 struct device_attribute *attr,
3310 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3312 return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->opts->host->nqn);
3314 static DEVICE_ATTR(hostnqn, S_IRUGO, nvme_sysfs_show_hostnqn, NULL);
3316 static ssize_t nvme_sysfs_show_hostid(struct device *dev,
3317 struct device_attribute *attr,
3320 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3322 return snprintf(buf, PAGE_SIZE, "%pU\n", &ctrl->opts->host->id);
3324 static DEVICE_ATTR(hostid, S_IRUGO, nvme_sysfs_show_hostid, NULL);
3326 static ssize_t nvme_sysfs_show_address(struct device *dev,
3327 struct device_attribute *attr,
3330 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3332 return ctrl->ops->get_address(ctrl, buf, PAGE_SIZE);
3334 static DEVICE_ATTR(address, S_IRUGO, nvme_sysfs_show_address, NULL);
3336 static struct attribute *nvme_dev_attrs[] = {
3337 &dev_attr_reset_controller.attr,
3338 &dev_attr_rescan_controller.attr,
3339 &dev_attr_model.attr,
3340 &dev_attr_serial.attr,
3341 &dev_attr_firmware_rev.attr,
3342 &dev_attr_cntlid.attr,
3343 &dev_attr_delete_controller.attr,
3344 &dev_attr_transport.attr,
3345 &dev_attr_subsysnqn.attr,
3346 &dev_attr_address.attr,
3347 &dev_attr_state.attr,
3348 &dev_attr_numa_node.attr,
3349 &dev_attr_queue_count.attr,
3350 &dev_attr_sqsize.attr,
3351 &dev_attr_hostnqn.attr,
3352 &dev_attr_hostid.attr,
3356 static umode_t nvme_dev_attrs_are_visible(struct kobject *kobj,
3357 struct attribute *a, int n)
3359 struct device *dev = container_of(kobj, struct device, kobj);
3360 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3362 if (a == &dev_attr_delete_controller.attr && !ctrl->ops->delete_ctrl)
3364 if (a == &dev_attr_address.attr && !ctrl->ops->get_address)
3366 if (a == &dev_attr_hostnqn.attr && !ctrl->opts)
3368 if (a == &dev_attr_hostid.attr && !ctrl->opts)
3374 static struct attribute_group nvme_dev_attrs_group = {
3375 .attrs = nvme_dev_attrs,
3376 .is_visible = nvme_dev_attrs_are_visible,
3379 static const struct attribute_group *nvme_dev_attr_groups[] = {
3380 &nvme_dev_attrs_group,
3384 static struct nvme_ns_head *nvme_find_ns_head(struct nvme_subsystem *subsys,
3387 struct nvme_ns_head *h;
3389 lockdep_assert_held(&subsys->lock);
3391 list_for_each_entry(h, &subsys->nsheads, entry) {
3392 if (h->ns_id == nsid && kref_get_unless_zero(&h->ref))
3399 static int __nvme_check_ids(struct nvme_subsystem *subsys,
3400 struct nvme_ns_head *new)
3402 struct nvme_ns_head *h;
3404 lockdep_assert_held(&subsys->lock);
3406 list_for_each_entry(h, &subsys->nsheads, entry) {
3407 if (nvme_ns_ids_valid(&new->ids) &&
3408 nvme_ns_ids_equal(&new->ids, &h->ids))
3415 static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl,
3416 unsigned nsid, struct nvme_ns_ids *ids)
3418 struct nvme_ns_head *head;
3419 size_t size = sizeof(*head);
3422 #ifdef CONFIG_NVME_MULTIPATH
3423 size += num_possible_nodes() * sizeof(struct nvme_ns *);
3426 head = kzalloc(size, GFP_KERNEL);
3429 ret = ida_simple_get(&ctrl->subsys->ns_ida, 1, 0, GFP_KERNEL);
3432 head->instance = ret;
3433 INIT_LIST_HEAD(&head->list);
3434 ret = init_srcu_struct(&head->srcu);
3436 goto out_ida_remove;
3437 head->subsys = ctrl->subsys;
3440 kref_init(&head->ref);
3442 ret = __nvme_check_ids(ctrl->subsys, head);
3444 dev_err(ctrl->device,
3445 "duplicate IDs for nsid %d\n", nsid);
3446 goto out_cleanup_srcu;
3449 ret = nvme_mpath_alloc_disk(ctrl, head);
3451 goto out_cleanup_srcu;
3453 list_add_tail(&head->entry, &ctrl->subsys->nsheads);
3455 kref_get(&ctrl->subsys->ref);
3459 cleanup_srcu_struct(&head->srcu);
3461 ida_simple_remove(&ctrl->subsys->ns_ida, head->instance);
3466 ret = blk_status_to_errno(nvme_error_status(ret));
3467 return ERR_PTR(ret);
3470 static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid,
3471 struct nvme_id_ns *id)
3473 struct nvme_ctrl *ctrl = ns->ctrl;
3474 bool is_shared = id->nmic & (1 << 0);
3475 struct nvme_ns_head *head = NULL;
3476 struct nvme_ns_ids ids;
3479 ret = nvme_report_ns_ids(ctrl, nsid, id, &ids);
3483 mutex_lock(&ctrl->subsys->lock);
3484 head = nvme_find_ns_head(ctrl->subsys, nsid);
3486 head = nvme_alloc_ns_head(ctrl, nsid, &ids);
3488 ret = PTR_ERR(head);
3491 head->shared = is_shared;
3493 if (!is_shared || !head->shared) {
3494 dev_err(ctrl->device,
3495 "Duplicate unshared namespace %d\n",
3498 nvme_put_ns_head(head);
3501 if (!nvme_ns_ids_equal(&head->ids, &ids)) {
3502 dev_err(ctrl->device,
3503 "IDs don't match for shared namespace %d\n",
3506 nvme_put_ns_head(head);
3511 list_add_tail(&ns->siblings, &head->list);
3515 mutex_unlock(&ctrl->subsys->lock);
3518 ret = blk_status_to_errno(nvme_error_status(ret));
3522 static int ns_cmp(void *priv, struct list_head *a, struct list_head *b)
3524 struct nvme_ns *nsa = container_of(a, struct nvme_ns, list);
3525 struct nvme_ns *nsb = container_of(b, struct nvme_ns, list);
3527 return nsa->head->ns_id - nsb->head->ns_id;
3530 static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid)
3532 struct nvme_ns *ns, *ret = NULL;
3534 down_read(&ctrl->namespaces_rwsem);
3535 list_for_each_entry(ns, &ctrl->namespaces, list) {
3536 if (ns->head->ns_id == nsid) {
3537 if (!kref_get_unless_zero(&ns->kref))
3542 if (ns->head->ns_id > nsid)
3545 up_read(&ctrl->namespaces_rwsem);
3549 static int nvme_setup_streams_ns(struct nvme_ctrl *ctrl, struct nvme_ns *ns)
3551 struct streams_directive_params s;
3554 if (!ctrl->nr_streams)
3557 ret = nvme_get_stream_params(ctrl, &s, ns->head->ns_id);
3561 ns->sws = le32_to_cpu(s.sws);
3562 ns->sgs = le16_to_cpu(s.sgs);
3565 unsigned int bs = 1 << ns->lba_shift;
3567 blk_queue_io_min(ns->queue, bs * ns->sws);
3569 blk_queue_io_opt(ns->queue, bs * ns->sws * ns->sgs);
3575 static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
3578 struct gendisk *disk;
3579 struct nvme_id_ns *id;
3580 char disk_name[DISK_NAME_LEN];
3581 int node = ctrl->numa_node, flags = GENHD_FL_EXT_DEVT, ret;
3583 ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node);
3587 ns->queue = blk_mq_init_queue(ctrl->tagset);
3588 if (IS_ERR(ns->queue))
3591 if (ctrl->opts && ctrl->opts->data_digest)
3592 ns->queue->backing_dev_info->capabilities
3593 |= BDI_CAP_STABLE_WRITES;
3595 blk_queue_flag_set(QUEUE_FLAG_NONROT, ns->queue);
3596 if (ctrl->ops->flags & NVME_F_PCI_P2PDMA)
3597 blk_queue_flag_set(QUEUE_FLAG_PCI_P2PDMA, ns->queue);
3599 ns->queue->queuedata = ns;
3602 kref_init(&ns->kref);
3603 ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */
3605 blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
3606 nvme_set_queue_limits(ctrl, ns->queue);
3608 ret = nvme_identify_ns(ctrl, nsid, &id);
3610 goto out_free_queue;
3612 if (id->ncap == 0) /* no namespace (legacy quirk) */
3615 ret = nvme_init_ns_head(ns, nsid, id);
3618 nvme_setup_streams_ns(ctrl, ns);
3619 nvme_set_disk_name(disk_name, ns, ctrl, &flags);
3621 disk = alloc_disk_node(0, node);
3625 disk->fops = &nvme_fops;
3626 disk->private_data = ns;
3627 disk->queue = ns->queue;
3628 disk->flags = flags;
3629 memcpy(disk->disk_name, disk_name, DISK_NAME_LEN);
3632 __nvme_revalidate_disk(disk, id);
3634 if ((ctrl->quirks & NVME_QUIRK_LIGHTNVM) && id->vs[0] == 0x1) {
3635 ret = nvme_nvm_register(ns, disk_name, node);
3637 dev_warn(ctrl->device, "LightNVM init failure\n");
3642 down_write(&ctrl->namespaces_rwsem);
3643 list_add_tail(&ns->list, &ctrl->namespaces);
3644 up_write(&ctrl->namespaces_rwsem);
3646 nvme_get_ctrl(ctrl);
3648 device_add_disk(ctrl->device, ns->disk, nvme_ns_id_attr_groups);
3650 nvme_mpath_add_disk(ns, id);
3651 nvme_fault_inject_init(&ns->fault_inject, ns->disk->disk_name);
3656 /* prevent double queue cleanup */
3657 ns->disk->queue = NULL;
3660 mutex_lock(&ctrl->subsys->lock);
3661 list_del_rcu(&ns->siblings);
3662 if (list_empty(&ns->head->list))
3663 list_del_init(&ns->head->entry);
3664 mutex_unlock(&ctrl->subsys->lock);
3665 nvme_put_ns_head(ns->head);
3669 blk_cleanup_queue(ns->queue);
3674 static void nvme_ns_remove(struct nvme_ns *ns)
3676 if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags))
3679 nvme_fault_inject_fini(&ns->fault_inject);
3681 mutex_lock(&ns->ctrl->subsys->lock);
3682 list_del_rcu(&ns->siblings);
3683 if (list_empty(&ns->head->list))
3684 list_del_init(&ns->head->entry);
3685 mutex_unlock(&ns->ctrl->subsys->lock);
3687 synchronize_rcu(); /* guarantee not available in head->list */
3688 nvme_mpath_clear_current_path(ns);
3689 synchronize_srcu(&ns->head->srcu); /* wait for concurrent submissions */
3691 if (ns->disk && ns->disk->flags & GENHD_FL_UP) {
3692 del_gendisk(ns->disk);
3693 blk_cleanup_queue(ns->queue);
3694 if (blk_get_integrity(ns->disk))
3695 blk_integrity_unregister(ns->disk);
3698 down_write(&ns->ctrl->namespaces_rwsem);
3699 list_del_init(&ns->list);
3700 up_write(&ns->ctrl->namespaces_rwsem);
3702 nvme_mpath_check_last_path(ns);
3706 static void nvme_ns_remove_by_nsid(struct nvme_ctrl *ctrl, u32 nsid)
3708 struct nvme_ns *ns = nvme_find_get_ns(ctrl, nsid);
3716 static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid)
3720 ns = nvme_find_get_ns(ctrl, nsid);
3722 if (ns->disk && revalidate_disk(ns->disk))
3726 nvme_alloc_ns(ctrl, nsid);
3729 static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl,
3732 struct nvme_ns *ns, *next;
3735 down_write(&ctrl->namespaces_rwsem);
3736 list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) {
3737 if (ns->head->ns_id > nsid || test_bit(NVME_NS_DEAD, &ns->flags))
3738 list_move_tail(&ns->list, &rm_list);
3740 up_write(&ctrl->namespaces_rwsem);
3742 list_for_each_entry_safe(ns, next, &rm_list, list)
3747 static int nvme_scan_ns_list(struct nvme_ctrl *ctrl)
3749 const int nr_entries = NVME_IDENTIFY_DATA_SIZE / sizeof(__le32);
3754 if (nvme_ctrl_limited_cns(ctrl))
3757 ns_list = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL);
3762 ret = nvme_identify_ns_list(ctrl, prev, ns_list);
3766 for (i = 0; i < nr_entries; i++) {
3767 u32 nsid = le32_to_cpu(ns_list[i]);
3769 if (!nsid) /* end of the list? */
3771 nvme_validate_ns(ctrl, nsid);
3772 while (++prev < nsid)
3773 nvme_ns_remove_by_nsid(ctrl, prev);
3777 nvme_remove_invalid_namespaces(ctrl, prev);
3783 static void nvme_scan_ns_sequential(struct nvme_ctrl *ctrl)
3785 struct nvme_id_ctrl *id;
3788 if (nvme_identify_ctrl(ctrl, &id))
3790 nn = le32_to_cpu(id->nn);
3793 for (i = 1; i <= nn; i++)
3794 nvme_validate_ns(ctrl, i);
3796 nvme_remove_invalid_namespaces(ctrl, nn);
3799 static void nvme_clear_changed_ns_log(struct nvme_ctrl *ctrl)
3801 size_t log_size = NVME_MAX_CHANGED_NAMESPACES * sizeof(__le32);
3805 log = kzalloc(log_size, GFP_KERNEL);
3810 * We need to read the log to clear the AEN, but we don't want to rely
3811 * on it for the changed namespace information as userspace could have
3812 * raced with us in reading the log page, which could cause us to miss
3815 error = nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_CHANGED_NS, 0, log,
3818 dev_warn(ctrl->device,
3819 "reading changed ns log failed: %d\n", error);
3824 static void nvme_scan_work(struct work_struct *work)
3826 struct nvme_ctrl *ctrl =
3827 container_of(work, struct nvme_ctrl, scan_work);
3829 /* No tagset on a live ctrl means IO queues could not created */
3830 if (ctrl->state != NVME_CTRL_LIVE || !ctrl->tagset)
3833 if (test_and_clear_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events)) {
3834 dev_info(ctrl->device, "rescanning namespaces.\n");
3835 nvme_clear_changed_ns_log(ctrl);
3838 mutex_lock(&ctrl->scan_lock);
3839 if (nvme_scan_ns_list(ctrl) != 0)
3840 nvme_scan_ns_sequential(ctrl);
3841 mutex_unlock(&ctrl->scan_lock);
3843 down_write(&ctrl->namespaces_rwsem);
3844 list_sort(NULL, &ctrl->namespaces, ns_cmp);
3845 up_write(&ctrl->namespaces_rwsem);
3849 * This function iterates the namespace list unlocked to allow recovery from
3850 * controller failure. It is up to the caller to ensure the namespace list is
3851 * not modified by scan work while this function is executing.
3853 void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
3855 struct nvme_ns *ns, *next;
3859 * make sure to requeue I/O to all namespaces as these
3860 * might result from the scan itself and must complete
3861 * for the scan_work to make progress
3863 nvme_mpath_clear_ctrl_paths(ctrl);
3865 /* prevent racing with ns scanning */
3866 flush_work(&ctrl->scan_work);
3869 * The dead states indicates the controller was not gracefully
3870 * disconnected. In that case, we won't be able to flush any data while
3871 * removing the namespaces' disks; fail all the queues now to avoid
3872 * potentially having to clean up the failed sync later.
3874 if (ctrl->state == NVME_CTRL_DEAD)
3875 nvme_kill_queues(ctrl);
3877 down_write(&ctrl->namespaces_rwsem);
3878 list_splice_init(&ctrl->namespaces, &ns_list);
3879 up_write(&ctrl->namespaces_rwsem);
3881 list_for_each_entry_safe(ns, next, &ns_list, list)
3884 EXPORT_SYMBOL_GPL(nvme_remove_namespaces);
3886 static int nvme_class_uevent(struct device *dev, struct kobj_uevent_env *env)
3888 struct nvme_ctrl *ctrl =
3889 container_of(dev, struct nvme_ctrl, ctrl_device);
3890 struct nvmf_ctrl_options *opts = ctrl->opts;
3893 ret = add_uevent_var(env, "NVME_TRTYPE=%s", ctrl->ops->name);
3898 ret = add_uevent_var(env, "NVME_TRADDR=%s", opts->traddr);
3902 ret = add_uevent_var(env, "NVME_TRSVCID=%s",
3903 opts->trsvcid ?: "none");
3907 ret = add_uevent_var(env, "NVME_HOST_TRADDR=%s",
3908 opts->host_traddr ?: "none");
3913 static void nvme_aen_uevent(struct nvme_ctrl *ctrl)
3915 char *envp[2] = { NULL, NULL };
3916 u32 aen_result = ctrl->aen_result;
3918 ctrl->aen_result = 0;
3922 envp[0] = kasprintf(GFP_KERNEL, "NVME_AEN=%#08x", aen_result);
3925 kobject_uevent_env(&ctrl->device->kobj, KOBJ_CHANGE, envp);
3929 static void nvme_async_event_work(struct work_struct *work)
3931 struct nvme_ctrl *ctrl =
3932 container_of(work, struct nvme_ctrl, async_event_work);
3934 nvme_aen_uevent(ctrl);
3935 ctrl->ops->submit_async_event(ctrl);
3938 static bool nvme_ctrl_pp_status(struct nvme_ctrl *ctrl)
3943 if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts))
3949 return ((ctrl->ctrl_config & NVME_CC_ENABLE) && (csts & NVME_CSTS_PP));
3952 static void nvme_get_fw_slot_info(struct nvme_ctrl *ctrl)
3954 struct nvme_fw_slot_info_log *log;
3956 log = kmalloc(sizeof(*log), GFP_KERNEL);
3960 if (nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_FW_SLOT, 0, log,
3962 dev_warn(ctrl->device, "Get FW SLOT INFO log error\n");
3966 static void nvme_fw_act_work(struct work_struct *work)
3968 struct nvme_ctrl *ctrl = container_of(work,
3969 struct nvme_ctrl, fw_act_work);
3970 unsigned long fw_act_timeout;
3973 fw_act_timeout = jiffies +
3974 msecs_to_jiffies(ctrl->mtfa * 100);
3976 fw_act_timeout = jiffies +
3977 msecs_to_jiffies(admin_timeout * 1000);
3979 nvme_stop_queues(ctrl);
3980 while (nvme_ctrl_pp_status(ctrl)) {
3981 if (time_after(jiffies, fw_act_timeout)) {
3982 dev_warn(ctrl->device,
3983 "Fw activation timeout, reset controller\n");
3984 nvme_try_sched_reset(ctrl);
3990 if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_LIVE))
3993 nvme_start_queues(ctrl);
3994 /* read FW slot information to clear the AER */
3995 nvme_get_fw_slot_info(ctrl);
3998 static void nvme_handle_aen_notice(struct nvme_ctrl *ctrl, u32 result)
4000 u32 aer_notice_type = (result & 0xff00) >> 8;
4002 trace_nvme_async_event(ctrl, aer_notice_type);
4004 switch (aer_notice_type) {
4005 case NVME_AER_NOTICE_NS_CHANGED:
4006 set_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events);
4007 nvme_queue_scan(ctrl);
4009 case NVME_AER_NOTICE_FW_ACT_STARTING:
4011 * We are (ab)using the RESETTING state to prevent subsequent
4012 * recovery actions from interfering with the controller's
4013 * firmware activation.
4015 if (nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING))
4016 queue_work(nvme_wq, &ctrl->fw_act_work);
4018 #ifdef CONFIG_NVME_MULTIPATH
4019 case NVME_AER_NOTICE_ANA:
4020 if (!ctrl->ana_log_buf)
4022 queue_work(nvme_wq, &ctrl->ana_work);
4025 case NVME_AER_NOTICE_DISC_CHANGED:
4026 ctrl->aen_result = result;
4029 dev_warn(ctrl->device, "async event result %08x\n", result);
4033 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
4034 volatile union nvme_result *res)
4036 u32 result = le32_to_cpu(res->u32);
4037 u32 aer_type = result & 0x07;
4039 if (le16_to_cpu(status) >> 1 != NVME_SC_SUCCESS)
4043 case NVME_AER_NOTICE:
4044 nvme_handle_aen_notice(ctrl, result);
4046 case NVME_AER_ERROR:
4047 case NVME_AER_SMART:
4050 trace_nvme_async_event(ctrl, aer_type);
4051 ctrl->aen_result = result;
4056 queue_work(nvme_wq, &ctrl->async_event_work);
4058 EXPORT_SYMBOL_GPL(nvme_complete_async_event);
4060 void nvme_stop_ctrl(struct nvme_ctrl *ctrl)
4062 nvme_mpath_stop(ctrl);
4063 nvme_stop_keep_alive(ctrl);
4064 flush_work(&ctrl->async_event_work);
4065 cancel_work_sync(&ctrl->fw_act_work);
4067 EXPORT_SYMBOL_GPL(nvme_stop_ctrl);
4069 void nvme_start_ctrl(struct nvme_ctrl *ctrl)
4072 nvme_start_keep_alive(ctrl);
4074 nvme_enable_aen(ctrl);
4076 if (ctrl->queue_count > 1) {
4077 nvme_queue_scan(ctrl);
4078 nvme_start_queues(ctrl);
4080 ctrl->created = true;
4082 EXPORT_SYMBOL_GPL(nvme_start_ctrl);
4084 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl)
4086 nvme_fault_inject_fini(&ctrl->fault_inject);
4087 dev_pm_qos_hide_latency_tolerance(ctrl->device);
4088 cdev_device_del(&ctrl->cdev, ctrl->device);
4089 nvme_put_ctrl(ctrl);
4091 EXPORT_SYMBOL_GPL(nvme_uninit_ctrl);
4093 static void nvme_free_ctrl(struct device *dev)
4095 struct nvme_ctrl *ctrl =
4096 container_of(dev, struct nvme_ctrl, ctrl_device);
4097 struct nvme_subsystem *subsys = ctrl->subsys;
4099 if (subsys && ctrl->instance != subsys->instance)
4100 ida_simple_remove(&nvme_instance_ida, ctrl->instance);
4102 kfree(ctrl->effects);
4103 nvme_mpath_uninit(ctrl);
4104 __free_page(ctrl->discard_page);
4107 mutex_lock(&nvme_subsystems_lock);
4108 list_del(&ctrl->subsys_entry);
4109 sysfs_remove_link(&subsys->dev.kobj, dev_name(ctrl->device));
4110 mutex_unlock(&nvme_subsystems_lock);
4113 ctrl->ops->free_ctrl(ctrl);
4116 nvme_put_subsystem(subsys);
4120 * Initialize a NVMe controller structures. This needs to be called during
4121 * earliest initialization so that we have the initialized structured around
4124 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
4125 const struct nvme_ctrl_ops *ops, unsigned long quirks)
4129 ctrl->state = NVME_CTRL_NEW;
4130 spin_lock_init(&ctrl->lock);
4131 mutex_init(&ctrl->scan_lock);
4132 INIT_LIST_HEAD(&ctrl->namespaces);
4133 init_rwsem(&ctrl->namespaces_rwsem);
4136 ctrl->quirks = quirks;
4137 INIT_WORK(&ctrl->scan_work, nvme_scan_work);
4138 INIT_WORK(&ctrl->async_event_work, nvme_async_event_work);
4139 INIT_WORK(&ctrl->fw_act_work, nvme_fw_act_work);
4140 INIT_WORK(&ctrl->delete_work, nvme_delete_ctrl_work);
4141 init_waitqueue_head(&ctrl->state_wq);
4143 INIT_DELAYED_WORK(&ctrl->ka_work, nvme_keep_alive_work);
4144 memset(&ctrl->ka_cmd, 0, sizeof(ctrl->ka_cmd));
4145 ctrl->ka_cmd.common.opcode = nvme_admin_keep_alive;
4147 BUILD_BUG_ON(NVME_DSM_MAX_RANGES * sizeof(struct nvme_dsm_range) >
4149 ctrl->discard_page = alloc_page(GFP_KERNEL);
4150 if (!ctrl->discard_page) {
4155 ret = ida_simple_get(&nvme_instance_ida, 0, 0, GFP_KERNEL);
4158 ctrl->instance = ret;
4160 device_initialize(&ctrl->ctrl_device);
4161 ctrl->device = &ctrl->ctrl_device;
4162 ctrl->device->devt = MKDEV(MAJOR(nvme_chr_devt), ctrl->instance);
4163 ctrl->device->class = nvme_class;
4164 ctrl->device->parent = ctrl->dev;
4165 ctrl->device->groups = nvme_dev_attr_groups;
4166 ctrl->device->release = nvme_free_ctrl;
4167 dev_set_drvdata(ctrl->device, ctrl);
4168 ret = dev_set_name(ctrl->device, "nvme%d", ctrl->instance);
4170 goto out_release_instance;
4172 nvme_get_ctrl(ctrl);
4173 cdev_init(&ctrl->cdev, &nvme_dev_fops);
4174 ctrl->cdev.owner = ops->module;
4175 ret = cdev_device_add(&ctrl->cdev, ctrl->device);
4180 * Initialize latency tolerance controls. The sysfs files won't
4181 * be visible to userspace unless the device actually supports APST.
4183 ctrl->device->power.set_latency_tolerance = nvme_set_latency_tolerance;
4184 dev_pm_qos_update_user_latency_tolerance(ctrl->device,
4185 min(default_ps_max_latency_us, (unsigned long)S32_MAX));
4187 nvme_fault_inject_init(&ctrl->fault_inject, dev_name(ctrl->device));
4191 nvme_put_ctrl(ctrl);
4192 kfree_const(ctrl->device->kobj.name);
4193 out_release_instance:
4194 ida_simple_remove(&nvme_instance_ida, ctrl->instance);
4196 if (ctrl->discard_page)
4197 __free_page(ctrl->discard_page);
4200 EXPORT_SYMBOL_GPL(nvme_init_ctrl);
4203 * nvme_kill_queues(): Ends all namespace queues
4204 * @ctrl: the dead controller that needs to end
4206 * Call this function when the driver determines it is unable to get the
4207 * controller in a state capable of servicing IO.
4209 void nvme_kill_queues(struct nvme_ctrl *ctrl)
4213 down_read(&ctrl->namespaces_rwsem);
4215 /* Forcibly unquiesce queues to avoid blocking dispatch */
4216 if (ctrl->admin_q && !blk_queue_dying(ctrl->admin_q))
4217 blk_mq_unquiesce_queue(ctrl->admin_q);
4219 list_for_each_entry(ns, &ctrl->namespaces, list)
4220 nvme_set_queue_dying(ns);
4222 up_read(&ctrl->namespaces_rwsem);
4224 EXPORT_SYMBOL_GPL(nvme_kill_queues);
4226 void nvme_unfreeze(struct nvme_ctrl *ctrl)
4230 down_read(&ctrl->namespaces_rwsem);
4231 list_for_each_entry(ns, &ctrl->namespaces, list)
4232 blk_mq_unfreeze_queue(ns->queue);
4233 up_read(&ctrl->namespaces_rwsem);
4235 EXPORT_SYMBOL_GPL(nvme_unfreeze);
4237 void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout)
4241 down_read(&ctrl->namespaces_rwsem);
4242 list_for_each_entry(ns, &ctrl->namespaces, list) {
4243 timeout = blk_mq_freeze_queue_wait_timeout(ns->queue, timeout);
4247 up_read(&ctrl->namespaces_rwsem);
4249 EXPORT_SYMBOL_GPL(nvme_wait_freeze_timeout);
4251 void nvme_wait_freeze(struct nvme_ctrl *ctrl)
4255 down_read(&ctrl->namespaces_rwsem);
4256 list_for_each_entry(ns, &ctrl->namespaces, list)
4257 blk_mq_freeze_queue_wait(ns->queue);
4258 up_read(&ctrl->namespaces_rwsem);
4260 EXPORT_SYMBOL_GPL(nvme_wait_freeze);
4262 void nvme_start_freeze(struct nvme_ctrl *ctrl)
4266 down_read(&ctrl->namespaces_rwsem);
4267 list_for_each_entry(ns, &ctrl->namespaces, list)
4268 blk_freeze_queue_start(ns->queue);
4269 up_read(&ctrl->namespaces_rwsem);
4271 EXPORT_SYMBOL_GPL(nvme_start_freeze);
4273 void nvme_stop_queues(struct nvme_ctrl *ctrl)
4277 down_read(&ctrl->namespaces_rwsem);
4278 list_for_each_entry(ns, &ctrl->namespaces, list)
4279 blk_mq_quiesce_queue(ns->queue);
4280 up_read(&ctrl->namespaces_rwsem);
4282 EXPORT_SYMBOL_GPL(nvme_stop_queues);
4284 void nvme_start_queues(struct nvme_ctrl *ctrl)
4288 down_read(&ctrl->namespaces_rwsem);
4289 list_for_each_entry(ns, &ctrl->namespaces, list)
4290 blk_mq_unquiesce_queue(ns->queue);
4291 up_read(&ctrl->namespaces_rwsem);
4293 EXPORT_SYMBOL_GPL(nvme_start_queues);
4296 void nvme_sync_queues(struct nvme_ctrl *ctrl)
4300 down_read(&ctrl->namespaces_rwsem);
4301 list_for_each_entry(ns, &ctrl->namespaces, list)
4302 blk_sync_queue(ns->queue);
4303 up_read(&ctrl->namespaces_rwsem);
4306 blk_sync_queue(ctrl->admin_q);
4308 EXPORT_SYMBOL_GPL(nvme_sync_queues);
4311 * Check we didn't inadvertently grow the command structure sizes:
4313 static inline void _nvme_check_size(void)
4315 BUILD_BUG_ON(sizeof(struct nvme_common_command) != 64);
4316 BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64);
4317 BUILD_BUG_ON(sizeof(struct nvme_identify) != 64);
4318 BUILD_BUG_ON(sizeof(struct nvme_features) != 64);
4319 BUILD_BUG_ON(sizeof(struct nvme_download_firmware) != 64);
4320 BUILD_BUG_ON(sizeof(struct nvme_format_cmd) != 64);
4321 BUILD_BUG_ON(sizeof(struct nvme_dsm_cmd) != 64);
4322 BUILD_BUG_ON(sizeof(struct nvme_write_zeroes_cmd) != 64);
4323 BUILD_BUG_ON(sizeof(struct nvme_abort_cmd) != 64);
4324 BUILD_BUG_ON(sizeof(struct nvme_get_log_page_command) != 64);
4325 BUILD_BUG_ON(sizeof(struct nvme_command) != 64);
4326 BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != NVME_IDENTIFY_DATA_SIZE);
4327 BUILD_BUG_ON(sizeof(struct nvme_id_ns) != NVME_IDENTIFY_DATA_SIZE);
4328 BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64);
4329 BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512);
4330 BUILD_BUG_ON(sizeof(struct nvme_dbbuf) != 64);
4331 BUILD_BUG_ON(sizeof(struct nvme_directive_cmd) != 64);
4335 static int __init nvme_core_init(void)
4337 int result = -ENOMEM;
4341 nvme_wq = alloc_workqueue("nvme-wq",
4342 WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
4346 nvme_reset_wq = alloc_workqueue("nvme-reset-wq",
4347 WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
4351 nvme_delete_wq = alloc_workqueue("nvme-delete-wq",
4352 WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
4353 if (!nvme_delete_wq)
4354 goto destroy_reset_wq;
4356 result = alloc_chrdev_region(&nvme_chr_devt, 0, NVME_MINORS, "nvme");
4358 goto destroy_delete_wq;
4360 nvme_class = class_create(THIS_MODULE, "nvme");
4361 if (IS_ERR(nvme_class)) {
4362 result = PTR_ERR(nvme_class);
4363 goto unregister_chrdev;
4365 nvme_class->dev_uevent = nvme_class_uevent;
4367 nvme_subsys_class = class_create(THIS_MODULE, "nvme-subsystem");
4368 if (IS_ERR(nvme_subsys_class)) {
4369 result = PTR_ERR(nvme_subsys_class);
4375 class_destroy(nvme_class);
4377 unregister_chrdev_region(nvme_chr_devt, NVME_MINORS);
4379 destroy_workqueue(nvme_delete_wq);
4381 destroy_workqueue(nvme_reset_wq);
4383 destroy_workqueue(nvme_wq);
4388 static void __exit nvme_core_exit(void)
4390 class_destroy(nvme_subsys_class);
4391 class_destroy(nvme_class);
4392 unregister_chrdev_region(nvme_chr_devt, NVME_MINORS);
4393 destroy_workqueue(nvme_delete_wq);
4394 destroy_workqueue(nvme_reset_wq);
4395 destroy_workqueue(nvme_wq);
4396 ida_destroy(&nvme_instance_ida);
4399 MODULE_LICENSE("GPL");
4400 MODULE_VERSION("1.0");
4401 module_init(nvme_core_init);
4402 module_exit(nvme_core_exit);