1
2
3
4
5
6
7#include <linux/blkdev.h>
8#include <linux/blk-mq.h>
9#include <linux/delay.h>
10#include <linux/errno.h>
11#include <linux/hdreg.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/backing-dev.h>
15#include <linux/list_sort.h>
16#include <linux/slab.h>
17#include <linux/types.h>
18#include <linux/pr.h>
19#include <linux/ptrace.h>
20#include <linux/nvme_ioctl.h>
21#include <linux/t10-pi.h>
22#include <linux/pm_qos.h>
23#include <asm/unaligned.h>
24
25#define CREATE_TRACE_POINTS
26#include "trace.h"
27
28#include "nvme.h"
29#include "fabrics.h"
30
31#define NVME_MINORS (1U << MINORBITS)
32
33unsigned int admin_timeout = 60;
34module_param(admin_timeout, uint, 0644);
35MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands");
36EXPORT_SYMBOL_GPL(admin_timeout);
37
38unsigned int nvme_io_timeout = 30;
39module_param_named(io_timeout, nvme_io_timeout, uint, 0644);
40MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O");
41EXPORT_SYMBOL_GPL(nvme_io_timeout);
42
43static unsigned char shutdown_timeout = 5;
44module_param(shutdown_timeout, byte, 0644);
45MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown");
46
47static u8 nvme_max_retries = 5;
48module_param_named(max_retries, nvme_max_retries, byte, 0644);
49MODULE_PARM_DESC(max_retries, "max number of retries a command may have");
50
51static unsigned long default_ps_max_latency_us = 100000;
52module_param(default_ps_max_latency_us, ulong, 0644);
53MODULE_PARM_DESC(default_ps_max_latency_us,
54 "max power saving latency for new devices; use PM QOS to change per device");
55
56static bool force_apst;
57module_param(force_apst, bool, 0644);
58MODULE_PARM_DESC(force_apst, "allow APST for newly enumerated devices even if quirked off");
59
60static bool streams;
61module_param(streams, bool, 0644);
62MODULE_PARM_DESC(streams, "turn on support for Streams write directives");
63
64
65
66
67
68
69
70
71
72
73
74
75struct workqueue_struct *nvme_wq;
76EXPORT_SYMBOL_GPL(nvme_wq);
77
78struct workqueue_struct *nvme_reset_wq;
79EXPORT_SYMBOL_GPL(nvme_reset_wq);
80
81struct workqueue_struct *nvme_delete_wq;
82EXPORT_SYMBOL_GPL(nvme_delete_wq);
83
84static DEFINE_IDA(nvme_subsystems_ida);
85static LIST_HEAD(nvme_subsystems);
86static DEFINE_MUTEX(nvme_subsystems_lock);
87
88static DEFINE_IDA(nvme_instance_ida);
89static dev_t nvme_chr_devt;
90static struct class *nvme_class;
91static struct class *nvme_subsys_class;
92
93static int nvme_revalidate_disk(struct gendisk *disk);
94static void nvme_put_subsystem(struct nvme_subsystem *subsys);
95static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl,
96 unsigned nsid);
97
98static void nvme_set_queue_dying(struct nvme_ns *ns)
99{
100
101
102
103
104 if (!ns->disk || test_and_set_bit(NVME_NS_DEAD, &ns->flags))
105 return;
106 revalidate_disk(ns->disk);
107 blk_set_queue_dying(ns->queue);
108
109 blk_mq_unquiesce_queue(ns->queue);
110}
111
112static void nvme_queue_scan(struct nvme_ctrl *ctrl)
113{
114
115
116
117 if (ctrl->state == NVME_CTRL_LIVE)
118 queue_work(nvme_wq, &ctrl->scan_work);
119}
120
121int nvme_reset_ctrl(struct nvme_ctrl *ctrl)
122{
123 if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING))
124 return -EBUSY;
125 if (!queue_work(nvme_reset_wq, &ctrl->reset_work))
126 return -EBUSY;
127 return 0;
128}
129EXPORT_SYMBOL_GPL(nvme_reset_ctrl);
130
131int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl)
132{
133 int ret;
134
135 ret = nvme_reset_ctrl(ctrl);
136 if (!ret) {
137 flush_work(&ctrl->reset_work);
138 if (ctrl->state != NVME_CTRL_LIVE &&
139 ctrl->state != NVME_CTRL_ADMIN_ONLY)
140 ret = -ENETRESET;
141 }
142
143 return ret;
144}
145EXPORT_SYMBOL_GPL(nvme_reset_ctrl_sync);
146
147static void nvme_do_delete_ctrl(struct nvme_ctrl *ctrl)
148{
149 dev_info(ctrl->device,
150 "Removing ctrl: NQN \"%s\"\n", ctrl->opts->subsysnqn);
151
152 flush_work(&ctrl->reset_work);
153 nvme_stop_ctrl(ctrl);
154 nvme_remove_namespaces(ctrl);
155 ctrl->ops->delete_ctrl(ctrl);
156 nvme_uninit_ctrl(ctrl);
157 nvme_put_ctrl(ctrl);
158}
159
160static void nvme_delete_ctrl_work(struct work_struct *work)
161{
162 struct nvme_ctrl *ctrl =
163 container_of(work, struct nvme_ctrl, delete_work);
164
165 nvme_do_delete_ctrl(ctrl);
166}
167
168int nvme_delete_ctrl(struct nvme_ctrl *ctrl)
169{
170 if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING))
171 return -EBUSY;
172 if (!queue_work(nvme_delete_wq, &ctrl->delete_work))
173 return -EBUSY;
174 return 0;
175}
176EXPORT_SYMBOL_GPL(nvme_delete_ctrl);
177
178static int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl)
179{
180 int ret = 0;
181
182
183
184
185
186 nvme_get_ctrl(ctrl);
187 if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING))
188 ret = -EBUSY;
189 if (!ret)
190 nvme_do_delete_ctrl(ctrl);
191 nvme_put_ctrl(ctrl);
192 return ret;
193}
194
195static inline bool nvme_ns_has_pi(struct nvme_ns *ns)
196{
197 return ns->pi_type && ns->ms == sizeof(struct t10_pi_tuple);
198}
199
200static blk_status_t nvme_error_status(struct request *req)
201{
202 switch (nvme_req(req)->status & 0x7ff) {
203 case NVME_SC_SUCCESS:
204 return BLK_STS_OK;
205 case NVME_SC_CAP_EXCEEDED:
206 return BLK_STS_NOSPC;
207 case NVME_SC_LBA_RANGE:
208 return BLK_STS_TARGET;
209 case NVME_SC_BAD_ATTRIBUTES:
210 case NVME_SC_ONCS_NOT_SUPPORTED:
211 case NVME_SC_INVALID_OPCODE:
212 case NVME_SC_INVALID_FIELD:
213 case NVME_SC_INVALID_NS:
214 return BLK_STS_NOTSUPP;
215 case NVME_SC_WRITE_FAULT:
216 case NVME_SC_READ_ERROR:
217 case NVME_SC_UNWRITTEN_BLOCK:
218 case NVME_SC_ACCESS_DENIED:
219 case NVME_SC_READ_ONLY:
220 case NVME_SC_COMPARE_FAILED:
221 return BLK_STS_MEDIUM;
222 case NVME_SC_GUARD_CHECK:
223 case NVME_SC_APPTAG_CHECK:
224 case NVME_SC_REFTAG_CHECK:
225 case NVME_SC_INVALID_PI:
226 return BLK_STS_PROTECTION;
227 case NVME_SC_RESERVATION_CONFLICT:
228 return BLK_STS_NEXUS;
229 default:
230 return BLK_STS_IOERR;
231 }
232}
233
234static inline bool nvme_req_needs_retry(struct request *req)
235{
236 if (blk_noretry_request(req))
237 return false;
238 if (nvme_req(req)->status & NVME_SC_DNR)
239 return false;
240 if (nvme_req(req)->retries >= nvme_max_retries)
241 return false;
242 return true;
243}
244
245static void nvme_retry_req(struct request *req)
246{
247 struct nvme_ns *ns = req->q->queuedata;
248 unsigned long delay = 0;
249 u16 crd;
250
251
252 crd = (nvme_req(req)->status & NVME_SC_CRD) >> 11;
253 if (ns && crd)
254 delay = ns->ctrl->crdt[crd - 1] * 100;
255
256 nvme_req(req)->retries++;
257 blk_mq_requeue_request(req, false);
258 blk_mq_delay_kick_requeue_list(req->q, delay);
259}
260
261void nvme_complete_rq(struct request *req)
262{
263 blk_status_t status = nvme_error_status(req);
264
265 trace_nvme_complete_rq(req);
266
267 if (nvme_req(req)->ctrl->kas)
268 nvme_req(req)->ctrl->comp_seen = true;
269
270 if (unlikely(status != BLK_STS_OK && nvme_req_needs_retry(req))) {
271 if ((req->cmd_flags & REQ_NVME_MPATH) &&
272 blk_path_error(status)) {
273 nvme_failover_req(req);
274 return;
275 }
276
277 if (!blk_queue_dying(req->q)) {
278 nvme_retry_req(req);
279 return;
280 }
281 }
282 blk_mq_end_request(req, status);
283}
284EXPORT_SYMBOL_GPL(nvme_complete_rq);
285
286bool nvme_cancel_request(struct request *req, void *data, bool reserved)
287{
288 dev_dbg_ratelimited(((struct nvme_ctrl *) data)->device,
289 "Cancelling I/O %d", req->tag);
290
291 nvme_req(req)->status = NVME_SC_ABORT_REQ;
292 blk_mq_complete_request_sync(req);
293 return true;
294}
295EXPORT_SYMBOL_GPL(nvme_cancel_request);
296
297bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
298 enum nvme_ctrl_state new_state)
299{
300 enum nvme_ctrl_state old_state;
301 unsigned long flags;
302 bool changed = false;
303
304 spin_lock_irqsave(&ctrl->lock, flags);
305
306 old_state = ctrl->state;
307 switch (new_state) {
308 case NVME_CTRL_ADMIN_ONLY:
309 switch (old_state) {
310 case NVME_CTRL_CONNECTING:
311 changed = true;
312
313 default:
314 break;
315 }
316 break;
317 case NVME_CTRL_LIVE:
318 switch (old_state) {
319 case NVME_CTRL_NEW:
320 case NVME_CTRL_RESETTING:
321 case NVME_CTRL_CONNECTING:
322 changed = true;
323
324 default:
325 break;
326 }
327 break;
328 case NVME_CTRL_RESETTING:
329 switch (old_state) {
330 case NVME_CTRL_NEW:
331 case NVME_CTRL_LIVE:
332 case NVME_CTRL_ADMIN_ONLY:
333 changed = true;
334
335 default:
336 break;
337 }
338 break;
339 case NVME_CTRL_CONNECTING:
340 switch (old_state) {
341 case NVME_CTRL_NEW:
342 case NVME_CTRL_RESETTING:
343 changed = true;
344
345 default:
346 break;
347 }
348 break;
349 case NVME_CTRL_DELETING:
350 switch (old_state) {
351 case NVME_CTRL_LIVE:
352 case NVME_CTRL_ADMIN_ONLY:
353 case NVME_CTRL_RESETTING:
354 case NVME_CTRL_CONNECTING:
355 changed = true;
356
357 default:
358 break;
359 }
360 break;
361 case NVME_CTRL_DEAD:
362 switch (old_state) {
363 case NVME_CTRL_DELETING:
364 changed = true;
365
366 default:
367 break;
368 }
369 break;
370 default:
371 break;
372 }
373
374 if (changed)
375 ctrl->state = new_state;
376
377 spin_unlock_irqrestore(&ctrl->lock, flags);
378 if (changed && ctrl->state == NVME_CTRL_LIVE)
379 nvme_kick_requeue_lists(ctrl);
380 return changed;
381}
382EXPORT_SYMBOL_GPL(nvme_change_ctrl_state);
383
384static void nvme_free_ns_head(struct kref *ref)
385{
386 struct nvme_ns_head *head =
387 container_of(ref, struct nvme_ns_head, ref);
388
389 nvme_mpath_remove_disk(head);
390 ida_simple_remove(&head->subsys->ns_ida, head->instance);
391 list_del_init(&head->entry);
392 cleanup_srcu_struct(&head->srcu);
393 nvme_put_subsystem(head->subsys);
394 kfree(head);
395}
396
397static void nvme_put_ns_head(struct nvme_ns_head *head)
398{
399 kref_put(&head->ref, nvme_free_ns_head);
400}
401
402static void nvme_free_ns(struct kref *kref)
403{
404 struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref);
405
406 if (ns->ndev)
407 nvme_nvm_unregister(ns);
408
409 put_disk(ns->disk);
410 nvme_put_ns_head(ns->head);
411 nvme_put_ctrl(ns->ctrl);
412 kfree(ns);
413}
414
415static void nvme_put_ns(struct nvme_ns *ns)
416{
417 kref_put(&ns->kref, nvme_free_ns);
418}
419
420static inline void nvme_clear_nvme_request(struct request *req)
421{
422 if (!(req->rq_flags & RQF_DONTPREP)) {
423 nvme_req(req)->retries = 0;
424 nvme_req(req)->flags = 0;
425 req->rq_flags |= RQF_DONTPREP;
426 }
427}
428
429struct request *nvme_alloc_request(struct request_queue *q,
430 struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid)
431{
432 unsigned op = nvme_is_write(cmd) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN;
433 struct request *req;
434
435 if (qid == NVME_QID_ANY) {
436 req = blk_mq_alloc_request(q, op, flags);
437 } else {
438 req = blk_mq_alloc_request_hctx(q, op, flags,
439 qid ? qid - 1 : 0);
440 }
441 if (IS_ERR(req))
442 return req;
443
444 req->cmd_flags |= REQ_FAILFAST_DRIVER;
445 nvme_clear_nvme_request(req);
446 nvme_req(req)->cmd = cmd;
447
448 return req;
449}
450EXPORT_SYMBOL_GPL(nvme_alloc_request);
451
452static int nvme_toggle_streams(struct nvme_ctrl *ctrl, bool enable)
453{
454 struct nvme_command c;
455
456 memset(&c, 0, sizeof(c));
457
458 c.directive.opcode = nvme_admin_directive_send;
459 c.directive.nsid = cpu_to_le32(NVME_NSID_ALL);
460 c.directive.doper = NVME_DIR_SND_ID_OP_ENABLE;
461 c.directive.dtype = NVME_DIR_IDENTIFY;
462 c.directive.tdtype = NVME_DIR_STREAMS;
463 c.directive.endir = enable ? NVME_DIR_ENDIR : 0;
464
465 return nvme_submit_sync_cmd(ctrl->admin_q, &c, NULL, 0);
466}
467
468static int nvme_disable_streams(struct nvme_ctrl *ctrl)
469{
470 return nvme_toggle_streams(ctrl, false);
471}
472
473static int nvme_enable_streams(struct nvme_ctrl *ctrl)
474{
475 return nvme_toggle_streams(ctrl, true);
476}
477
478static int nvme_get_stream_params(struct nvme_ctrl *ctrl,
479 struct streams_directive_params *s, u32 nsid)
480{
481 struct nvme_command c;
482
483 memset(&c, 0, sizeof(c));
484 memset(s, 0, sizeof(*s));
485
486 c.directive.opcode = nvme_admin_directive_recv;
487 c.directive.nsid = cpu_to_le32(nsid);
488 c.directive.numd = cpu_to_le32((sizeof(*s) >> 2) - 1);
489 c.directive.doper = NVME_DIR_RCV_ST_OP_PARAM;
490 c.directive.dtype = NVME_DIR_STREAMS;
491
492 return nvme_submit_sync_cmd(ctrl->admin_q, &c, s, sizeof(*s));
493}
494
495static int nvme_configure_directives(struct nvme_ctrl *ctrl)
496{
497 struct streams_directive_params s;
498 int ret;
499
500 if (!(ctrl->oacs & NVME_CTRL_OACS_DIRECTIVES))
501 return 0;
502 if (!streams)
503 return 0;
504
505 ret = nvme_enable_streams(ctrl);
506 if (ret)
507 return ret;
508
509 ret = nvme_get_stream_params(ctrl, &s, NVME_NSID_ALL);
510 if (ret)
511 return ret;
512
513 ctrl->nssa = le16_to_cpu(s.nssa);
514 if (ctrl->nssa < BLK_MAX_WRITE_HINTS - 1) {
515 dev_info(ctrl->device, "too few streams (%u) available\n",
516 ctrl->nssa);
517 nvme_disable_streams(ctrl);
518 return 0;
519 }
520
521 ctrl->nr_streams = min_t(unsigned, ctrl->nssa, BLK_MAX_WRITE_HINTS - 1);
522 dev_info(ctrl->device, "Using %u streams\n", ctrl->nr_streams);
523 return 0;
524}
525
526
527
528
529
530static void nvme_assign_write_stream(struct nvme_ctrl *ctrl,
531 struct request *req, u16 *control,
532 u32 *dsmgmt)
533{
534 enum rw_hint streamid = req->write_hint;
535
536 if (streamid == WRITE_LIFE_NOT_SET || streamid == WRITE_LIFE_NONE)
537 streamid = 0;
538 else {
539 streamid--;
540 if (WARN_ON_ONCE(streamid > ctrl->nr_streams))
541 return;
542
543 *control |= NVME_RW_DTYPE_STREAMS;
544 *dsmgmt |= streamid << 16;
545 }
546
547 if (streamid < ARRAY_SIZE(req->q->write_hints))
548 req->q->write_hints[streamid] += blk_rq_bytes(req) >> 9;
549}
550
551static inline void nvme_setup_flush(struct nvme_ns *ns,
552 struct nvme_command *cmnd)
553{
554 cmnd->common.opcode = nvme_cmd_flush;
555 cmnd->common.nsid = cpu_to_le32(ns->head->ns_id);
556}
557
558static blk_status_t nvme_setup_discard(struct nvme_ns *ns, struct request *req,
559 struct nvme_command *cmnd)
560{
561 unsigned short segments = blk_rq_nr_discard_segments(req), n = 0;
562 struct nvme_dsm_range *range;
563 struct bio *bio;
564
565 range = kmalloc_array(segments, sizeof(*range),
566 GFP_ATOMIC | __GFP_NOWARN);
567 if (!range) {
568
569
570
571
572
573 if (test_and_set_bit_lock(0, &ns->ctrl->discard_page_busy))
574 return BLK_STS_RESOURCE;
575
576 range = page_address(ns->ctrl->discard_page);
577 }
578
579 __rq_for_each_bio(bio, req) {
580 u64 slba = nvme_block_nr(ns, bio->bi_iter.bi_sector);
581 u32 nlb = bio->bi_iter.bi_size >> ns->lba_shift;
582
583 if (n < segments) {
584 range[n].cattr = cpu_to_le32(0);
585 range[n].nlb = cpu_to_le32(nlb);
586 range[n].slba = cpu_to_le64(slba);
587 }
588 n++;
589 }
590
591 if (WARN_ON_ONCE(n != segments)) {
592 if (virt_to_page(range) == ns->ctrl->discard_page)
593 clear_bit_unlock(0, &ns->ctrl->discard_page_busy);
594 else
595 kfree(range);
596 return BLK_STS_IOERR;
597 }
598
599 cmnd->dsm.opcode = nvme_cmd_dsm;
600 cmnd->dsm.nsid = cpu_to_le32(ns->head->ns_id);
601 cmnd->dsm.nr = cpu_to_le32(segments - 1);
602 cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
603
604 req->special_vec.bv_page = virt_to_page(range);
605 req->special_vec.bv_offset = offset_in_page(range);
606 req->special_vec.bv_len = sizeof(*range) * segments;
607 req->rq_flags |= RQF_SPECIAL_PAYLOAD;
608
609 return BLK_STS_OK;
610}
611
612static inline blk_status_t nvme_setup_write_zeroes(struct nvme_ns *ns,
613 struct request *req, struct nvme_command *cmnd)
614{
615 if (ns->ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
616 return nvme_setup_discard(ns, req, cmnd);
617
618 cmnd->write_zeroes.opcode = nvme_cmd_write_zeroes;
619 cmnd->write_zeroes.nsid = cpu_to_le32(ns->head->ns_id);
620 cmnd->write_zeroes.slba =
621 cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
622 cmnd->write_zeroes.length =
623 cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
624 cmnd->write_zeroes.control = 0;
625 return BLK_STS_OK;
626}
627
628static inline blk_status_t nvme_setup_rw(struct nvme_ns *ns,
629 struct request *req, struct nvme_command *cmnd)
630{
631 struct nvme_ctrl *ctrl = ns->ctrl;
632 u16 control = 0;
633 u32 dsmgmt = 0;
634
635 if (req->cmd_flags & REQ_FUA)
636 control |= NVME_RW_FUA;
637 if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD))
638 control |= NVME_RW_LR;
639
640 if (req->cmd_flags & REQ_RAHEAD)
641 dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;
642
643 cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read);
644 cmnd->rw.nsid = cpu_to_le32(ns->head->ns_id);
645 cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
646 cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
647
648 if (req_op(req) == REQ_OP_WRITE && ctrl->nr_streams)
649 nvme_assign_write_stream(ctrl, req, &control, &dsmgmt);
650
651 if (ns->ms) {
652
653
654
655
656
657
658 if (!blk_integrity_rq(req)) {
659 if (WARN_ON_ONCE(!nvme_ns_has_pi(ns)))
660 return BLK_STS_NOTSUPP;
661 control |= NVME_RW_PRINFO_PRACT;
662 } else if (req_op(req) == REQ_OP_WRITE) {
663 t10_pi_prepare(req, ns->pi_type);
664 }
665
666 switch (ns->pi_type) {
667 case NVME_NS_DPS_PI_TYPE3:
668 control |= NVME_RW_PRINFO_PRCHK_GUARD;
669 break;
670 case NVME_NS_DPS_PI_TYPE1:
671 case NVME_NS_DPS_PI_TYPE2:
672 control |= NVME_RW_PRINFO_PRCHK_GUARD |
673 NVME_RW_PRINFO_PRCHK_REF;
674 cmnd->rw.reftag = cpu_to_le32(t10_pi_ref_tag(req));
675 break;
676 }
677 }
678
679 cmnd->rw.control = cpu_to_le16(control);
680 cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
681 return 0;
682}
683
684void nvme_cleanup_cmd(struct request *req)
685{
686 if (blk_integrity_rq(req) && req_op(req) == REQ_OP_READ &&
687 nvme_req(req)->status == 0) {
688 struct nvme_ns *ns = req->rq_disk->private_data;
689
690 t10_pi_complete(req, ns->pi_type,
691 blk_rq_bytes(req) >> ns->lba_shift);
692 }
693 if (req->rq_flags & RQF_SPECIAL_PAYLOAD) {
694 struct nvme_ns *ns = req->rq_disk->private_data;
695 struct page *page = req->special_vec.bv_page;
696
697 if (page == ns->ctrl->discard_page)
698 clear_bit_unlock(0, &ns->ctrl->discard_page_busy);
699 else
700 kfree(page_address(page) + req->special_vec.bv_offset);
701 }
702}
703EXPORT_SYMBOL_GPL(nvme_cleanup_cmd);
704
705blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
706 struct nvme_command *cmd)
707{
708 blk_status_t ret = BLK_STS_OK;
709
710 nvme_clear_nvme_request(req);
711
712 memset(cmd, 0, sizeof(*cmd));
713 switch (req_op(req)) {
714 case REQ_OP_DRV_IN:
715 case REQ_OP_DRV_OUT:
716 memcpy(cmd, nvme_req(req)->cmd, sizeof(*cmd));
717 break;
718 case REQ_OP_FLUSH:
719 nvme_setup_flush(ns, cmd);
720 break;
721 case REQ_OP_WRITE_ZEROES:
722 ret = nvme_setup_write_zeroes(ns, req, cmd);
723 break;
724 case REQ_OP_DISCARD:
725 ret = nvme_setup_discard(ns, req, cmd);
726 break;
727 case REQ_OP_READ:
728 case REQ_OP_WRITE:
729 ret = nvme_setup_rw(ns, req, cmd);
730 break;
731 default:
732 WARN_ON_ONCE(1);
733 return BLK_STS_IOERR;
734 }
735
736 cmd->common.command_id = req->tag;
737 trace_nvme_setup_cmd(req, cmd);
738 return ret;
739}
740EXPORT_SYMBOL_GPL(nvme_setup_cmd);
741
742static void nvme_end_sync_rq(struct request *rq, blk_status_t error)
743{
744 struct completion *waiting = rq->end_io_data;
745
746 rq->end_io_data = NULL;
747 complete(waiting);
748}
749
750static void nvme_execute_rq_polled(struct request_queue *q,
751 struct gendisk *bd_disk, struct request *rq, int at_head)
752{
753 DECLARE_COMPLETION_ONSTACK(wait);
754
755 WARN_ON_ONCE(!test_bit(QUEUE_FLAG_POLL, &q->queue_flags));
756
757 rq->cmd_flags |= REQ_HIPRI;
758 rq->end_io_data = &wait;
759 blk_execute_rq_nowait(q, bd_disk, rq, at_head, nvme_end_sync_rq);
760
761 while (!completion_done(&wait)) {
762 blk_poll(q, request_to_qc_t(rq->mq_hctx, rq), true);
763 cond_resched();
764 }
765}
766
767
768
769
770
771int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
772 union nvme_result *result, void *buffer, unsigned bufflen,
773 unsigned timeout, int qid, int at_head,
774 blk_mq_req_flags_t flags, bool poll)
775{
776 struct request *req;
777 int ret;
778
779 req = nvme_alloc_request(q, cmd, flags, qid);
780 if (IS_ERR(req))
781 return PTR_ERR(req);
782
783 req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
784
785 if (buffer && bufflen) {
786 ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL);
787 if (ret)
788 goto out;
789 }
790
791 if (poll)
792 nvme_execute_rq_polled(req->q, NULL, req, at_head);
793 else
794 blk_execute_rq(req->q, NULL, req, at_head);
795 if (result)
796 *result = nvme_req(req)->result;
797 if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
798 ret = -EINTR;
799 else
800 ret = nvme_req(req)->status;
801 out:
802 blk_mq_free_request(req);
803 return ret;
804}
805EXPORT_SYMBOL_GPL(__nvme_submit_sync_cmd);
806
807int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
808 void *buffer, unsigned bufflen)
809{
810 return __nvme_submit_sync_cmd(q, cmd, NULL, buffer, bufflen, 0,
811 NVME_QID_ANY, 0, 0, false);
812}
813EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd);
814
815static void *nvme_add_user_metadata(struct bio *bio, void __user *ubuf,
816 unsigned len, u32 seed, bool write)
817{
818 struct bio_integrity_payload *bip;
819 int ret = -ENOMEM;
820 void *buf;
821
822 buf = kmalloc(len, GFP_KERNEL);
823 if (!buf)
824 goto out;
825
826 ret = -EFAULT;
827 if (write && copy_from_user(buf, ubuf, len))
828 goto out_free_meta;
829
830 bip = bio_integrity_alloc(bio, GFP_KERNEL, 1);
831 if (IS_ERR(bip)) {
832 ret = PTR_ERR(bip);
833 goto out_free_meta;
834 }
835
836 bip->bip_iter.bi_size = len;
837 bip->bip_iter.bi_sector = seed;
838 ret = bio_integrity_add_page(bio, virt_to_page(buf), len,
839 offset_in_page(buf));
840 if (ret == len)
841 return buf;
842 ret = -ENOMEM;
843out_free_meta:
844 kfree(buf);
845out:
846 return ERR_PTR(ret);
847}
848
849static int nvme_submit_user_cmd(struct request_queue *q,
850 struct nvme_command *cmd, void __user *ubuffer,
851 unsigned bufflen, void __user *meta_buffer, unsigned meta_len,
852 u32 meta_seed, u32 *result, unsigned timeout)
853{
854 bool write = nvme_is_write(cmd);
855 struct nvme_ns *ns = q->queuedata;
856 struct gendisk *disk = ns ? ns->disk : NULL;
857 struct request *req;
858 struct bio *bio = NULL;
859 void *meta = NULL;
860 int ret;
861
862 req = nvme_alloc_request(q, cmd, 0, NVME_QID_ANY);
863 if (IS_ERR(req))
864 return PTR_ERR(req);
865
866 req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
867 nvme_req(req)->flags |= NVME_REQ_USERCMD;
868
869 if (ubuffer && bufflen) {
870 ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
871 GFP_KERNEL);
872 if (ret)
873 goto out;
874 bio = req->bio;
875 bio->bi_disk = disk;
876 if (disk && meta_buffer && meta_len) {
877 meta = nvme_add_user_metadata(bio, meta_buffer, meta_len,
878 meta_seed, write);
879 if (IS_ERR(meta)) {
880 ret = PTR_ERR(meta);
881 goto out_unmap;
882 }
883 req->cmd_flags |= REQ_INTEGRITY;
884 }
885 }
886
887 blk_execute_rq(req->q, disk, req, 0);
888 if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
889 ret = -EINTR;
890 else
891 ret = nvme_req(req)->status;
892 if (result)
893 *result = le32_to_cpu(nvme_req(req)->result.u32);
894 if (meta && !ret && !write) {
895 if (copy_to_user(meta_buffer, meta, meta_len))
896 ret = -EFAULT;
897 }
898 kfree(meta);
899 out_unmap:
900 if (bio)
901 blk_rq_unmap_user(bio);
902 out:
903 blk_mq_free_request(req);
904 return ret;
905}
906
907static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status)
908{
909 struct nvme_ctrl *ctrl = rq->end_io_data;
910 unsigned long flags;
911 bool startka = false;
912
913 blk_mq_free_request(rq);
914
915 if (status) {
916 dev_err(ctrl->device,
917 "failed nvme_keep_alive_end_io error=%d\n",
918 status);
919 return;
920 }
921
922 ctrl->comp_seen = false;
923 spin_lock_irqsave(&ctrl->lock, flags);
924 if (ctrl->state == NVME_CTRL_LIVE ||
925 ctrl->state == NVME_CTRL_CONNECTING)
926 startka = true;
927 spin_unlock_irqrestore(&ctrl->lock, flags);
928 if (startka)
929 schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
930}
931
932static int nvme_keep_alive(struct nvme_ctrl *ctrl)
933{
934 struct request *rq;
935
936 rq = nvme_alloc_request(ctrl->admin_q, &ctrl->ka_cmd, BLK_MQ_REQ_RESERVED,
937 NVME_QID_ANY);
938 if (IS_ERR(rq))
939 return PTR_ERR(rq);
940
941 rq->timeout = ctrl->kato * HZ;
942 rq->end_io_data = ctrl;
943
944 blk_execute_rq_nowait(rq->q, NULL, rq, 0, nvme_keep_alive_end_io);
945
946 return 0;
947}
948
949static void nvme_keep_alive_work(struct work_struct *work)
950{
951 struct nvme_ctrl *ctrl = container_of(to_delayed_work(work),
952 struct nvme_ctrl, ka_work);
953 bool comp_seen = ctrl->comp_seen;
954
955 if ((ctrl->ctratt & NVME_CTRL_ATTR_TBKAS) && comp_seen) {
956 dev_dbg(ctrl->device,
957 "reschedule traffic based keep-alive timer\n");
958 ctrl->comp_seen = false;
959 schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
960 return;
961 }
962
963 if (nvme_keep_alive(ctrl)) {
964
965 dev_err(ctrl->device, "keep-alive failed\n");
966 nvme_reset_ctrl(ctrl);
967 return;
968 }
969}
970
971static void nvme_start_keep_alive(struct nvme_ctrl *ctrl)
972{
973 if (unlikely(ctrl->kato == 0))
974 return;
975
976 schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
977}
978
979void nvme_stop_keep_alive(struct nvme_ctrl *ctrl)
980{
981 if (unlikely(ctrl->kato == 0))
982 return;
983
984 cancel_delayed_work_sync(&ctrl->ka_work);
985}
986EXPORT_SYMBOL_GPL(nvme_stop_keep_alive);
987
988static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
989{
990 struct nvme_command c = { };
991 int error;
992
993
994 c.identify.opcode = nvme_admin_identify;
995 c.identify.cns = NVME_ID_CNS_CTRL;
996
997 *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL);
998 if (!*id)
999 return -ENOMEM;
1000
1001 error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
1002 sizeof(struct nvme_id_ctrl));
1003 if (error)
1004 kfree(*id);
1005 return error;
1006}
1007
1008static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
1009 struct nvme_ns_ids *ids)
1010{
1011 struct nvme_command c = { };
1012 int status;
1013 void *data;
1014 int pos;
1015 int len;
1016
1017 c.identify.opcode = nvme_admin_identify;
1018 c.identify.nsid = cpu_to_le32(nsid);
1019 c.identify.cns = NVME_ID_CNS_NS_DESC_LIST;
1020
1021 data = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL);
1022 if (!data)
1023 return -ENOMEM;
1024
1025 status = nvme_submit_sync_cmd(ctrl->admin_q, &c, data,
1026 NVME_IDENTIFY_DATA_SIZE);
1027 if (status)
1028 goto free_data;
1029
1030 for (pos = 0; pos < NVME_IDENTIFY_DATA_SIZE; pos += len) {
1031 struct nvme_ns_id_desc *cur = data + pos;
1032
1033 if (cur->nidl == 0)
1034 break;
1035
1036 switch (cur->nidt) {
1037 case NVME_NIDT_EUI64:
1038 if (cur->nidl != NVME_NIDT_EUI64_LEN) {
1039 dev_warn(ctrl->device,
1040 "ctrl returned bogus length: %d for NVME_NIDT_EUI64\n",
1041 cur->nidl);
1042 goto free_data;
1043 }
1044 len = NVME_NIDT_EUI64_LEN;
1045 memcpy(ids->eui64, data + pos + sizeof(*cur), len);
1046 break;
1047 case NVME_NIDT_NGUID:
1048 if (cur->nidl != NVME_NIDT_NGUID_LEN) {
1049 dev_warn(ctrl->device,
1050 "ctrl returned bogus length: %d for NVME_NIDT_NGUID\n",
1051 cur->nidl);
1052 goto free_data;
1053 }
1054 len = NVME_NIDT_NGUID_LEN;
1055 memcpy(ids->nguid, data + pos + sizeof(*cur), len);
1056 break;
1057 case NVME_NIDT_UUID:
1058 if (cur->nidl != NVME_NIDT_UUID_LEN) {
1059 dev_warn(ctrl->device,
1060 "ctrl returned bogus length: %d for NVME_NIDT_UUID\n",
1061 cur->nidl);
1062 goto free_data;
1063 }
1064 len = NVME_NIDT_UUID_LEN;
1065 uuid_copy(&ids->uuid, data + pos + sizeof(*cur));
1066 break;
1067 default:
1068
1069 len = cur->nidl;
1070 break;
1071 }
1072
1073 len += sizeof(*cur);
1074 }
1075free_data:
1076 kfree(data);
1077 return status;
1078}
1079
1080static int nvme_identify_ns_list(struct nvme_ctrl *dev, unsigned nsid, __le32 *ns_list)
1081{
1082 struct nvme_command c = { };
1083
1084 c.identify.opcode = nvme_admin_identify;
1085 c.identify.cns = NVME_ID_CNS_NS_ACTIVE_LIST;
1086 c.identify.nsid = cpu_to_le32(nsid);
1087 return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list,
1088 NVME_IDENTIFY_DATA_SIZE);
1089}
1090
1091static struct nvme_id_ns *nvme_identify_ns(struct nvme_ctrl *ctrl,
1092 unsigned nsid)
1093{
1094 struct nvme_id_ns *id;
1095 struct nvme_command c = { };
1096 int error;
1097
1098
1099 c.identify.opcode = nvme_admin_identify;
1100 c.identify.nsid = cpu_to_le32(nsid);
1101 c.identify.cns = NVME_ID_CNS_NS;
1102
1103 id = kmalloc(sizeof(*id), GFP_KERNEL);
1104 if (!id)
1105 return NULL;
1106
1107 error = nvme_submit_sync_cmd(ctrl->admin_q, &c, id, sizeof(*id));
1108 if (error) {
1109 dev_warn(ctrl->device, "Identify namespace failed (%d)\n", error);
1110 kfree(id);
1111 return NULL;
1112 }
1113
1114 return id;
1115}
1116
1117static int nvme_features(struct nvme_ctrl *dev, u8 op, unsigned int fid,
1118 unsigned int dword11, void *buffer, size_t buflen, u32 *result)
1119{
1120 struct nvme_command c;
1121 union nvme_result res;
1122 int ret;
1123
1124 memset(&c, 0, sizeof(c));
1125 c.features.opcode = op;
1126 c.features.fid = cpu_to_le32(fid);
1127 c.features.dword11 = cpu_to_le32(dword11);
1128
1129 ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &res,
1130 buffer, buflen, 0, NVME_QID_ANY, 0, 0, false);
1131 if (ret >= 0 && result)
1132 *result = le32_to_cpu(res.u32);
1133 return ret;
1134}
1135
1136int nvme_set_features(struct nvme_ctrl *dev, unsigned int fid,
1137 unsigned int dword11, void *buffer, size_t buflen,
1138 u32 *result)
1139{
1140 return nvme_features(dev, nvme_admin_set_features, fid, dword11, buffer,
1141 buflen, result);
1142}
1143EXPORT_SYMBOL_GPL(nvme_set_features);
1144
1145int nvme_get_features(struct nvme_ctrl *dev, unsigned int fid,
1146 unsigned int dword11, void *buffer, size_t buflen,
1147 u32 *result)
1148{
1149 return nvme_features(dev, nvme_admin_get_features, fid, dword11, buffer,
1150 buflen, result);
1151}
1152EXPORT_SYMBOL_GPL(nvme_get_features);
1153
1154int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count)
1155{
1156 u32 q_count = (*count - 1) | ((*count - 1) << 16);
1157 u32 result;
1158 int status, nr_io_queues;
1159
1160 status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, NULL, 0,
1161 &result);
1162 if (status < 0)
1163 return status;
1164
1165
1166
1167
1168
1169
1170 if (status > 0) {
1171 dev_err(ctrl->device, "Could not set queue count (%d)\n", status);
1172 *count = 0;
1173 } else {
1174 nr_io_queues = min(result & 0xffff, result >> 16) + 1;
1175 *count = min(*count, nr_io_queues);
1176 }
1177
1178 return 0;
1179}
1180EXPORT_SYMBOL_GPL(nvme_set_queue_count);
1181
1182#define NVME_AEN_SUPPORTED \
1183 (NVME_AEN_CFG_NS_ATTR | NVME_AEN_CFG_FW_ACT | NVME_AEN_CFG_ANA_CHANGE)
1184
1185static void nvme_enable_aen(struct nvme_ctrl *ctrl)
1186{
1187 u32 result, supported_aens = ctrl->oaes & NVME_AEN_SUPPORTED;
1188 int status;
1189
1190 if (!supported_aens)
1191 return;
1192
1193 status = nvme_set_features(ctrl, NVME_FEAT_ASYNC_EVENT, supported_aens,
1194 NULL, 0, &result);
1195 if (status)
1196 dev_warn(ctrl->device, "Failed to configure AEN (cfg %x)\n",
1197 supported_aens);
1198}
1199
1200static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
1201{
1202 struct nvme_user_io io;
1203 struct nvme_command c;
1204 unsigned length, meta_len;
1205 void __user *metadata;
1206
1207 if (copy_from_user(&io, uio, sizeof(io)))
1208 return -EFAULT;
1209 if (io.flags)
1210 return -EINVAL;
1211
1212 switch (io.opcode) {
1213 case nvme_cmd_write:
1214 case nvme_cmd_read:
1215 case nvme_cmd_compare:
1216 break;
1217 default:
1218 return -EINVAL;
1219 }
1220
1221 length = (io.nblocks + 1) << ns->lba_shift;
1222 meta_len = (io.nblocks + 1) * ns->ms;
1223 metadata = (void __user *)(uintptr_t)io.metadata;
1224
1225 if (ns->ext) {
1226 length += meta_len;
1227 meta_len = 0;
1228 } else if (meta_len) {
1229 if ((io.metadata & 3) || !io.metadata)
1230 return -EINVAL;
1231 }
1232
1233 memset(&c, 0, sizeof(c));
1234 c.rw.opcode = io.opcode;
1235 c.rw.flags = io.flags;
1236 c.rw.nsid = cpu_to_le32(ns->head->ns_id);
1237 c.rw.slba = cpu_to_le64(io.slba);
1238 c.rw.length = cpu_to_le16(io.nblocks);
1239 c.rw.control = cpu_to_le16(io.control);
1240 c.rw.dsmgmt = cpu_to_le32(io.dsmgmt);
1241 c.rw.reftag = cpu_to_le32(io.reftag);
1242 c.rw.apptag = cpu_to_le16(io.apptag);
1243 c.rw.appmask = cpu_to_le16(io.appmask);
1244
1245 return nvme_submit_user_cmd(ns->queue, &c,
1246 (void __user *)(uintptr_t)io.addr, length,
1247 metadata, meta_len, lower_32_bits(io.slba), NULL, 0);
1248}
1249
1250static u32 nvme_known_admin_effects(u8 opcode)
1251{
1252 switch (opcode) {
1253 case nvme_admin_format_nvm:
1254 return NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC |
1255 NVME_CMD_EFFECTS_CSE_MASK;
1256 case nvme_admin_sanitize_nvm:
1257 return NVME_CMD_EFFECTS_CSE_MASK;
1258 default:
1259 break;
1260 }
1261 return 0;
1262}
1263
1264static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
1265 u8 opcode)
1266{
1267 u32 effects = 0;
1268
1269 if (ns) {
1270 if (ctrl->effects)
1271 effects = le32_to_cpu(ctrl->effects->iocs[opcode]);
1272 if (effects & ~(NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC))
1273 dev_warn(ctrl->device,
1274 "IO command:%02x has unhandled effects:%08x\n",
1275 opcode, effects);
1276 return 0;
1277 }
1278
1279 if (ctrl->effects)
1280 effects = le32_to_cpu(ctrl->effects->acs[opcode]);
1281 effects |= nvme_known_admin_effects(opcode);
1282
1283
1284
1285
1286
1287 if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) {
1288 mutex_lock(&ctrl->scan_lock);
1289 mutex_lock(&ctrl->subsys->lock);
1290 nvme_mpath_start_freeze(ctrl->subsys);
1291 nvme_mpath_wait_freeze(ctrl->subsys);
1292 nvme_start_freeze(ctrl);
1293 nvme_wait_freeze(ctrl);
1294 }
1295 return effects;
1296}
1297
1298static void nvme_update_formats(struct nvme_ctrl *ctrl)
1299{
1300 struct nvme_ns *ns;
1301
1302 down_read(&ctrl->namespaces_rwsem);
1303 list_for_each_entry(ns, &ctrl->namespaces, list)
1304 if (ns->disk && nvme_revalidate_disk(ns->disk))
1305 nvme_set_queue_dying(ns);
1306 up_read(&ctrl->namespaces_rwsem);
1307
1308 nvme_remove_invalid_namespaces(ctrl, NVME_NSID_ALL);
1309}
1310
1311static void nvme_passthru_end(struct nvme_ctrl *ctrl, u32 effects)
1312{
1313
1314
1315
1316
1317
1318 if (effects & NVME_CMD_EFFECTS_LBCC)
1319 nvme_update_formats(ctrl);
1320 if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) {
1321 nvme_unfreeze(ctrl);
1322 nvme_mpath_unfreeze(ctrl->subsys);
1323 mutex_unlock(&ctrl->subsys->lock);
1324 mutex_unlock(&ctrl->scan_lock);
1325 }
1326 if (effects & NVME_CMD_EFFECTS_CCC)
1327 nvme_init_identify(ctrl);
1328 if (effects & (NVME_CMD_EFFECTS_NIC | NVME_CMD_EFFECTS_NCC))
1329 nvme_queue_scan(ctrl);
1330}
1331
1332static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
1333 struct nvme_passthru_cmd __user *ucmd)
1334{
1335 struct nvme_passthru_cmd cmd;
1336 struct nvme_command c;
1337 unsigned timeout = 0;
1338 u32 effects;
1339 int status;
1340
1341 if (!capable(CAP_SYS_ADMIN))
1342 return -EACCES;
1343 if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
1344 return -EFAULT;
1345 if (cmd.flags)
1346 return -EINVAL;
1347
1348 memset(&c, 0, sizeof(c));
1349 c.common.opcode = cmd.opcode;
1350 c.common.flags = cmd.flags;
1351 c.common.nsid = cpu_to_le32(cmd.nsid);
1352 c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
1353 c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
1354 c.common.cdw10 = cpu_to_le32(cmd.cdw10);
1355 c.common.cdw11 = cpu_to_le32(cmd.cdw11);
1356 c.common.cdw12 = cpu_to_le32(cmd.cdw12);
1357 c.common.cdw13 = cpu_to_le32(cmd.cdw13);
1358 c.common.cdw14 = cpu_to_le32(cmd.cdw14);
1359 c.common.cdw15 = cpu_to_le32(cmd.cdw15);
1360
1361 if (cmd.timeout_ms)
1362 timeout = msecs_to_jiffies(cmd.timeout_ms);
1363
1364 effects = nvme_passthru_start(ctrl, ns, cmd.opcode);
1365 status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
1366 (void __user *)(uintptr_t)cmd.addr, cmd.data_len,
1367 (void __user *)(uintptr_t)cmd.metadata, cmd.metadata_len,
1368 0, &cmd.result, timeout);
1369 nvme_passthru_end(ctrl, effects);
1370
1371 if (status >= 0) {
1372 if (put_user(cmd.result, &ucmd->result))
1373 return -EFAULT;
1374 }
1375
1376 return status;
1377}
1378
1379
1380
1381
1382
1383static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk,
1384 struct nvme_ns_head **head, int *srcu_idx)
1385{
1386#ifdef CONFIG_NVME_MULTIPATH
1387 if (disk->fops == &nvme_ns_head_ops) {
1388 struct nvme_ns *ns;
1389
1390 *head = disk->private_data;
1391 *srcu_idx = srcu_read_lock(&(*head)->srcu);
1392 ns = nvme_find_path(*head);
1393 if (!ns)
1394 srcu_read_unlock(&(*head)->srcu, *srcu_idx);
1395 return ns;
1396 }
1397#endif
1398 *head = NULL;
1399 *srcu_idx = -1;
1400 return disk->private_data;
1401}
1402
1403static void nvme_put_ns_from_disk(struct nvme_ns_head *head, int idx)
1404{
1405 if (head)
1406 srcu_read_unlock(&head->srcu, idx);
1407}
1408
1409static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
1410 unsigned int cmd, unsigned long arg)
1411{
1412 struct nvme_ns_head *head = NULL;
1413 void __user *argp = (void __user *)arg;
1414 struct nvme_ns *ns;
1415 int srcu_idx, ret;
1416
1417 ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx);
1418 if (unlikely(!ns))
1419 return -EWOULDBLOCK;
1420
1421
1422
1423
1424
1425
1426 if (cmd == NVME_IOCTL_ADMIN_CMD || is_sed_ioctl(cmd)) {
1427 struct nvme_ctrl *ctrl = ns->ctrl;
1428
1429 nvme_get_ctrl(ns->ctrl);
1430 nvme_put_ns_from_disk(head, srcu_idx);
1431
1432 if (cmd == NVME_IOCTL_ADMIN_CMD)
1433 ret = nvme_user_cmd(ctrl, NULL, argp);
1434 else
1435 ret = sed_ioctl(ctrl->opal_dev, cmd, argp);
1436
1437 nvme_put_ctrl(ctrl);
1438 return ret;
1439 }
1440
1441 switch (cmd) {
1442 case NVME_IOCTL_ID:
1443 force_successful_syscall_return();
1444 ret = ns->head->ns_id;
1445 break;
1446 case NVME_IOCTL_IO_CMD:
1447 ret = nvme_user_cmd(ns->ctrl, ns, argp);
1448 break;
1449 case NVME_IOCTL_SUBMIT_IO:
1450 ret = nvme_submit_io(ns, argp);
1451 break;
1452 default:
1453 if (ns->ndev)
1454 ret = nvme_nvm_ioctl(ns, cmd, arg);
1455 else
1456 ret = -ENOTTY;
1457 }
1458
1459 nvme_put_ns_from_disk(head, srcu_idx);
1460 return ret;
1461}
1462
1463static int nvme_open(struct block_device *bdev, fmode_t mode)
1464{
1465 struct nvme_ns *ns = bdev->bd_disk->private_data;
1466
1467#ifdef CONFIG_NVME_MULTIPATH
1468
1469 if (WARN_ON_ONCE(ns->head->disk))
1470 goto fail;
1471#endif
1472 if (!kref_get_unless_zero(&ns->kref))
1473 goto fail;
1474 if (!try_module_get(ns->ctrl->ops->module))
1475 goto fail_put_ns;
1476
1477 return 0;
1478
1479fail_put_ns:
1480 nvme_put_ns(ns);
1481fail:
1482 return -ENXIO;
1483}
1484
1485static void nvme_release(struct gendisk *disk, fmode_t mode)
1486{
1487 struct nvme_ns *ns = disk->private_data;
1488
1489 module_put(ns->ctrl->ops->module);
1490 nvme_put_ns(ns);
1491}
1492
1493static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1494{
1495
1496 geo->heads = 1 << 6;
1497 geo->sectors = 1 << 5;
1498 geo->cylinders = get_capacity(bdev->bd_disk) >> 11;
1499 return 0;
1500}
1501
1502#ifdef CONFIG_BLK_DEV_INTEGRITY
1503static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type)
1504{
1505 struct blk_integrity integrity;
1506
1507 memset(&integrity, 0, sizeof(integrity));
1508 switch (pi_type) {
1509 case NVME_NS_DPS_PI_TYPE3:
1510 integrity.profile = &t10_pi_type3_crc;
1511 integrity.tag_size = sizeof(u16) + sizeof(u32);
1512 integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
1513 break;
1514 case NVME_NS_DPS_PI_TYPE1:
1515 case NVME_NS_DPS_PI_TYPE2:
1516 integrity.profile = &t10_pi_type1_crc;
1517 integrity.tag_size = sizeof(u16);
1518 integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
1519 break;
1520 default:
1521 integrity.profile = NULL;
1522 break;
1523 }
1524 integrity.tuple_size = ms;
1525 blk_integrity_register(disk, &integrity);
1526 blk_queue_max_integrity_segments(disk->queue, 1);
1527}
1528#else
1529static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type)
1530{
1531}
1532#endif
1533
1534static void nvme_set_chunk_size(struct nvme_ns *ns)
1535{
1536 u32 chunk_size = (((u32)ns->noiob) << (ns->lba_shift - 9));
1537 blk_queue_chunk_sectors(ns->queue, rounddown_pow_of_two(chunk_size));
1538}
1539
1540static void nvme_config_discard(struct gendisk *disk, struct nvme_ns *ns)
1541{
1542 struct nvme_ctrl *ctrl = ns->ctrl;
1543 struct request_queue *queue = disk->queue;
1544 u32 size = queue_logical_block_size(queue);
1545
1546 if (!(ctrl->oncs & NVME_CTRL_ONCS_DSM)) {
1547 blk_queue_flag_clear(QUEUE_FLAG_DISCARD, queue);
1548 return;
1549 }
1550
1551 if (ctrl->nr_streams && ns->sws && ns->sgs)
1552 size *= ns->sws * ns->sgs;
1553
1554 BUILD_BUG_ON(PAGE_SIZE / sizeof(struct nvme_dsm_range) <
1555 NVME_DSM_MAX_RANGES);
1556
1557 queue->limits.discard_alignment = 0;
1558 queue->limits.discard_granularity = size;
1559
1560
1561 if (blk_queue_flag_test_and_set(QUEUE_FLAG_DISCARD, queue))
1562 return;
1563
1564 blk_queue_max_discard_sectors(queue, UINT_MAX);
1565 blk_queue_max_discard_segments(queue, NVME_DSM_MAX_RANGES);
1566
1567 if (ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
1568 blk_queue_max_write_zeroes_sectors(queue, UINT_MAX);
1569}
1570
1571static void nvme_config_write_zeroes(struct gendisk *disk, struct nvme_ns *ns)
1572{
1573 u32 max_sectors;
1574 unsigned short bs = 1 << ns->lba_shift;
1575
1576 if (!(ns->ctrl->oncs & NVME_CTRL_ONCS_WRITE_ZEROES) ||
1577 (ns->ctrl->quirks & NVME_QUIRK_DISABLE_WRITE_ZEROES))
1578 return;
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589 if (ns->ctrl->max_hw_sectors == UINT_MAX)
1590 max_sectors = ((u32)(USHRT_MAX + 1) * bs) >> 9;
1591 else
1592 max_sectors = ((u32)(ns->ctrl->max_hw_sectors + 1) * bs) >> 9;
1593
1594 blk_queue_max_write_zeroes_sectors(disk->queue, max_sectors);
1595}
1596
1597static void nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid,
1598 struct nvme_id_ns *id, struct nvme_ns_ids *ids)
1599{
1600 memset(ids, 0, sizeof(*ids));
1601
1602 if (ctrl->vs >= NVME_VS(1, 1, 0))
1603 memcpy(ids->eui64, id->eui64, sizeof(id->eui64));
1604 if (ctrl->vs >= NVME_VS(1, 2, 0))
1605 memcpy(ids->nguid, id->nguid, sizeof(id->nguid));
1606 if (ctrl->vs >= NVME_VS(1, 3, 0)) {
1607
1608
1609
1610 if (nvme_identify_ns_descs(ctrl, nsid, ids))
1611 dev_warn(ctrl->device,
1612 "%s: Identify Descriptors failed\n", __func__);
1613 }
1614}
1615
1616static bool nvme_ns_ids_valid(struct nvme_ns_ids *ids)
1617{
1618 return !uuid_is_null(&ids->uuid) ||
1619 memchr_inv(ids->nguid, 0, sizeof(ids->nguid)) ||
1620 memchr_inv(ids->eui64, 0, sizeof(ids->eui64));
1621}
1622
1623static bool nvme_ns_ids_equal(struct nvme_ns_ids *a, struct nvme_ns_ids *b)
1624{
1625 return uuid_equal(&a->uuid, &b->uuid) &&
1626 memcmp(&a->nguid, &b->nguid, sizeof(a->nguid)) == 0 &&
1627 memcmp(&a->eui64, &b->eui64, sizeof(a->eui64)) == 0;
1628}
1629
1630static void nvme_update_disk_info(struct gendisk *disk,
1631 struct nvme_ns *ns, struct nvme_id_ns *id)
1632{
1633 sector_t capacity = le64_to_cpu(id->nsze) << (ns->lba_shift - 9);
1634 unsigned short bs = 1 << ns->lba_shift;
1635 u32 atomic_bs, phys_bs, io_opt;
1636
1637 if (ns->lba_shift > PAGE_SHIFT) {
1638
1639 bs = (1 << 9);
1640 }
1641 blk_mq_freeze_queue(disk->queue);
1642 blk_integrity_unregister(disk);
1643
1644 if (id->nabo == 0) {
1645
1646
1647
1648
1649
1650 if (id->nsfeat & (1 << 1) && id->nawupf)
1651 atomic_bs = (1 + le16_to_cpu(id->nawupf)) * bs;
1652 else
1653 atomic_bs = (1 + ns->ctrl->subsys->awupf) * bs;
1654 } else {
1655 atomic_bs = bs;
1656 }
1657 phys_bs = bs;
1658 io_opt = bs;
1659 if (id->nsfeat & (1 << 4)) {
1660
1661 phys_bs *= 1 + le16_to_cpu(id->npwg);
1662
1663 io_opt *= 1 + le16_to_cpu(id->nows);
1664 }
1665
1666 blk_queue_logical_block_size(disk->queue, bs);
1667
1668
1669
1670
1671
1672 blk_queue_physical_block_size(disk->queue, min(phys_bs, atomic_bs));
1673 blk_queue_io_min(disk->queue, phys_bs);
1674 blk_queue_io_opt(disk->queue, io_opt);
1675
1676 if (ns->ms && !ns->ext &&
1677 (ns->ctrl->ops->flags & NVME_F_METADATA_SUPPORTED))
1678 nvme_init_integrity(disk, ns->ms, ns->pi_type);
1679 if ((ns->ms && !nvme_ns_has_pi(ns) && !blk_get_integrity(disk)) ||
1680 ns->lba_shift > PAGE_SHIFT)
1681 capacity = 0;
1682
1683 set_capacity(disk, capacity);
1684
1685 nvme_config_discard(disk, ns);
1686 nvme_config_write_zeroes(disk, ns);
1687
1688 if (id->nsattr & (1 << 0))
1689 set_disk_ro(disk, true);
1690 else
1691 set_disk_ro(disk, false);
1692
1693 blk_mq_unfreeze_queue(disk->queue);
1694}
1695
1696static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
1697{
1698 struct nvme_ns *ns = disk->private_data;
1699
1700
1701
1702
1703
1704 ns->lba_shift = id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ds;
1705 if (ns->lba_shift == 0)
1706 ns->lba_shift = 9;
1707 ns->noiob = le16_to_cpu(id->noiob);
1708 ns->ms = le16_to_cpu(id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ms);
1709 ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT);
1710
1711 if (ns->ms == sizeof(struct t10_pi_tuple))
1712 ns->pi_type = id->dps & NVME_NS_DPS_PI_MASK;
1713 else
1714 ns->pi_type = 0;
1715
1716 if (ns->noiob)
1717 nvme_set_chunk_size(ns);
1718 nvme_update_disk_info(disk, ns, id);
1719#ifdef CONFIG_NVME_MULTIPATH
1720 if (ns->head->disk) {
1721 nvme_update_disk_info(ns->head->disk, ns, id);
1722 blk_queue_stack_limits(ns->head->disk->queue, ns->queue);
1723 revalidate_disk(ns->head->disk);
1724 }
1725#endif
1726}
1727
1728static int nvme_revalidate_disk(struct gendisk *disk)
1729{
1730 struct nvme_ns *ns = disk->private_data;
1731 struct nvme_ctrl *ctrl = ns->ctrl;
1732 struct nvme_id_ns *id;
1733 struct nvme_ns_ids ids;
1734 int ret = 0;
1735
1736 if (test_bit(NVME_NS_DEAD, &ns->flags)) {
1737 set_capacity(disk, 0);
1738 return -ENODEV;
1739 }
1740
1741 id = nvme_identify_ns(ctrl, ns->head->ns_id);
1742 if (!id)
1743 return -ENODEV;
1744
1745 if (id->ncap == 0) {
1746 ret = -ENODEV;
1747 goto out;
1748 }
1749
1750 __nvme_revalidate_disk(disk, id);
1751 nvme_report_ns_ids(ctrl, ns->head->ns_id, id, &ids);
1752 if (!nvme_ns_ids_equal(&ns->head->ids, &ids)) {
1753 dev_err(ctrl->device,
1754 "identifiers changed for nsid %d\n", ns->head->ns_id);
1755 ret = -ENODEV;
1756 }
1757
1758out:
1759 kfree(id);
1760 return ret;
1761}
1762
1763static char nvme_pr_type(enum pr_type type)
1764{
1765 switch (type) {
1766 case PR_WRITE_EXCLUSIVE:
1767 return 1;
1768 case PR_EXCLUSIVE_ACCESS:
1769 return 2;
1770 case PR_WRITE_EXCLUSIVE_REG_ONLY:
1771 return 3;
1772 case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1773 return 4;
1774 case PR_WRITE_EXCLUSIVE_ALL_REGS:
1775 return 5;
1776 case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1777 return 6;
1778 default:
1779 return 0;
1780 }
1781};
1782
1783static int nvme_pr_command(struct block_device *bdev, u32 cdw10,
1784 u64 key, u64 sa_key, u8 op)
1785{
1786 struct nvme_ns_head *head = NULL;
1787 struct nvme_ns *ns;
1788 struct nvme_command c;
1789 int srcu_idx, ret;
1790 u8 data[16] = { 0, };
1791
1792 ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx);
1793 if (unlikely(!ns))
1794 return -EWOULDBLOCK;
1795
1796 put_unaligned_le64(key, &data[0]);
1797 put_unaligned_le64(sa_key, &data[8]);
1798
1799 memset(&c, 0, sizeof(c));
1800 c.common.opcode = op;
1801 c.common.nsid = cpu_to_le32(ns->head->ns_id);
1802 c.common.cdw10 = cpu_to_le32(cdw10);
1803
1804 ret = nvme_submit_sync_cmd(ns->queue, &c, data, 16);
1805 nvme_put_ns_from_disk(head, srcu_idx);
1806 return ret;
1807}
1808
1809static int nvme_pr_register(struct block_device *bdev, u64 old,
1810 u64 new, unsigned flags)
1811{
1812 u32 cdw10;
1813
1814 if (flags & ~PR_FL_IGNORE_KEY)
1815 return -EOPNOTSUPP;
1816
1817 cdw10 = old ? 2 : 0;
1818 cdw10 |= (flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0;
1819 cdw10 |= (1 << 30) | (1 << 31);
1820 return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_register);
1821}
1822
1823static int nvme_pr_reserve(struct block_device *bdev, u64 key,
1824 enum pr_type type, unsigned flags)
1825{
1826 u32 cdw10;
1827
1828 if (flags & ~PR_FL_IGNORE_KEY)
1829 return -EOPNOTSUPP;
1830
1831 cdw10 = nvme_pr_type(type) << 8;
1832 cdw10 |= ((flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0);
1833 return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_acquire);
1834}
1835
1836static int nvme_pr_preempt(struct block_device *bdev, u64 old, u64 new,
1837 enum pr_type type, bool abort)
1838{
1839 u32 cdw10 = nvme_pr_type(type) << 8 | (abort ? 2 : 1);
1840 return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_acquire);
1841}
1842
1843static int nvme_pr_clear(struct block_device *bdev, u64 key)
1844{
1845 u32 cdw10 = 1 | (key ? 1 << 3 : 0);
1846 return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_register);
1847}
1848
1849static int nvme_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1850{
1851 u32 cdw10 = nvme_pr_type(type) << 8 | (key ? 1 << 3 : 0);
1852 return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_release);
1853}
1854
1855static const struct pr_ops nvme_pr_ops = {
1856 .pr_register = nvme_pr_register,
1857 .pr_reserve = nvme_pr_reserve,
1858 .pr_release = nvme_pr_release,
1859 .pr_preempt = nvme_pr_preempt,
1860 .pr_clear = nvme_pr_clear,
1861};
1862
1863#ifdef CONFIG_BLK_SED_OPAL
1864int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
1865 bool send)
1866{
1867 struct nvme_ctrl *ctrl = data;
1868 struct nvme_command cmd;
1869
1870 memset(&cmd, 0, sizeof(cmd));
1871 if (send)
1872 cmd.common.opcode = nvme_admin_security_send;
1873 else
1874 cmd.common.opcode = nvme_admin_security_recv;
1875 cmd.common.nsid = 0;
1876 cmd.common.cdw10 = cpu_to_le32(((u32)secp) << 24 | ((u32)spsp) << 8);
1877 cmd.common.cdw11 = cpu_to_le32(len);
1878
1879 return __nvme_submit_sync_cmd(ctrl->admin_q, &cmd, NULL, buffer, len,
1880 ADMIN_TIMEOUT, NVME_QID_ANY, 1, 0, false);
1881}
1882EXPORT_SYMBOL_GPL(nvme_sec_submit);
1883#endif
1884
1885static const struct block_device_operations nvme_fops = {
1886 .owner = THIS_MODULE,
1887 .ioctl = nvme_ioctl,
1888 .compat_ioctl = nvme_ioctl,
1889 .open = nvme_open,
1890 .release = nvme_release,
1891 .getgeo = nvme_getgeo,
1892 .revalidate_disk= nvme_revalidate_disk,
1893 .pr_ops = &nvme_pr_ops,
1894};
1895
1896#ifdef CONFIG_NVME_MULTIPATH
1897static int nvme_ns_head_open(struct block_device *bdev, fmode_t mode)
1898{
1899 struct nvme_ns_head *head = bdev->bd_disk->private_data;
1900
1901 if (!kref_get_unless_zero(&head->ref))
1902 return -ENXIO;
1903 return 0;
1904}
1905
1906static void nvme_ns_head_release(struct gendisk *disk, fmode_t mode)
1907{
1908 nvme_put_ns_head(disk->private_data);
1909}
1910
1911const struct block_device_operations nvme_ns_head_ops = {
1912 .owner = THIS_MODULE,
1913 .open = nvme_ns_head_open,
1914 .release = nvme_ns_head_release,
1915 .ioctl = nvme_ioctl,
1916 .compat_ioctl = nvme_ioctl,
1917 .getgeo = nvme_getgeo,
1918 .pr_ops = &nvme_pr_ops,
1919};
1920#endif
1921
1922static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled)
1923{
1924 unsigned long timeout =
1925 ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
1926 u32 csts, bit = enabled ? NVME_CSTS_RDY : 0;
1927 int ret;
1928
1929 while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
1930 if (csts == ~0)
1931 return -ENODEV;
1932 if ((csts & NVME_CSTS_RDY) == bit)
1933 break;
1934
1935 msleep(100);
1936 if (fatal_signal_pending(current))
1937 return -EINTR;
1938 if (time_after(jiffies, timeout)) {
1939 dev_err(ctrl->device,
1940 "Device not ready; aborting %s\n", enabled ?
1941 "initialisation" : "reset");
1942 return -ENODEV;
1943 }
1944 }
1945
1946 return ret;
1947}
1948
1949
1950
1951
1952
1953
1954
1955int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
1956{
1957 int ret;
1958
1959 ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
1960 ctrl->ctrl_config &= ~NVME_CC_ENABLE;
1961
1962 ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
1963 if (ret)
1964 return ret;
1965
1966 if (ctrl->quirks & NVME_QUIRK_DELAY_BEFORE_CHK_RDY)
1967 msleep(NVME_QUIRK_DELAY_AMOUNT);
1968
1969 return nvme_wait_ready(ctrl, cap, false);
1970}
1971EXPORT_SYMBOL_GPL(nvme_disable_ctrl);
1972
1973int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
1974{
1975
1976
1977
1978
1979
1980 unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12, page_shift = 12;
1981 int ret;
1982
1983 if (page_shift < dev_page_min) {
1984 dev_err(ctrl->device,
1985 "Minimum device page size %u too large for host (%u)\n",
1986 1 << dev_page_min, 1 << page_shift);
1987 return -ENODEV;
1988 }
1989
1990 ctrl->page_size = 1 << page_shift;
1991
1992 ctrl->ctrl_config = NVME_CC_CSS_NVM;
1993 ctrl->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT;
1994 ctrl->ctrl_config |= NVME_CC_AMS_RR | NVME_CC_SHN_NONE;
1995 ctrl->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;
1996 ctrl->ctrl_config |= NVME_CC_ENABLE;
1997
1998 ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
1999 if (ret)
2000 return ret;
2001 return nvme_wait_ready(ctrl, cap, true);
2002}
2003EXPORT_SYMBOL_GPL(nvme_enable_ctrl);
2004
2005int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
2006{
2007 unsigned long timeout = jiffies + (ctrl->shutdown_timeout * HZ);
2008 u32 csts;
2009 int ret;
2010
2011 ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
2012 ctrl->ctrl_config |= NVME_CC_SHN_NORMAL;
2013
2014 ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
2015 if (ret)
2016 return ret;
2017
2018 while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
2019 if ((csts & NVME_CSTS_SHST_MASK) == NVME_CSTS_SHST_CMPLT)
2020 break;
2021
2022 msleep(100);
2023 if (fatal_signal_pending(current))
2024 return -EINTR;
2025 if (time_after(jiffies, timeout)) {
2026 dev_err(ctrl->device,
2027 "Device shutdown incomplete; abort shutdown\n");
2028 return -ENODEV;
2029 }
2030 }
2031
2032 return ret;
2033}
2034EXPORT_SYMBOL_GPL(nvme_shutdown_ctrl);
2035
2036static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
2037 struct request_queue *q)
2038{
2039 bool vwc = false;
2040
2041 if (ctrl->max_hw_sectors) {
2042 u32 max_segments =
2043 (ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1;
2044
2045 max_segments = min_not_zero(max_segments, ctrl->max_segments);
2046 blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
2047 blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
2048 }
2049 if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) &&
2050 is_power_of_2(ctrl->max_hw_sectors))
2051 blk_queue_chunk_sectors(q, ctrl->max_hw_sectors);
2052 blk_queue_virt_boundary(q, ctrl->page_size - 1);
2053 if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
2054 vwc = true;
2055 blk_queue_write_cache(q, vwc, vwc);
2056}
2057
2058static int nvme_configure_timestamp(struct nvme_ctrl *ctrl)
2059{
2060 __le64 ts;
2061 int ret;
2062
2063 if (!(ctrl->oncs & NVME_CTRL_ONCS_TIMESTAMP))
2064 return 0;
2065
2066 ts = cpu_to_le64(ktime_to_ms(ktime_get_real()));
2067 ret = nvme_set_features(ctrl, NVME_FEAT_TIMESTAMP, 0, &ts, sizeof(ts),
2068 NULL);
2069 if (ret)
2070 dev_warn_once(ctrl->device,
2071 "could not set timestamp (%d)\n", ret);
2072 return ret;
2073}
2074
2075static int nvme_configure_acre(struct nvme_ctrl *ctrl)
2076{
2077 struct nvme_feat_host_behavior *host;
2078 int ret;
2079
2080
2081 if (!ctrl->crdt[0])
2082 return 0;
2083
2084 host = kzalloc(sizeof(*host), GFP_KERNEL);
2085 if (!host)
2086 return 0;
2087
2088 host->acre = NVME_ENABLE_ACRE;
2089 ret = nvme_set_features(ctrl, NVME_FEAT_HOST_BEHAVIOR, 0,
2090 host, sizeof(*host), NULL);
2091 kfree(host);
2092 return ret;
2093}
2094
2095static int nvme_configure_apst(struct nvme_ctrl *ctrl)
2096{
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113 unsigned apste;
2114 struct nvme_feat_auto_pst *table;
2115 u64 max_lat_us = 0;
2116 int max_ps = -1;
2117 int ret;
2118
2119
2120
2121
2122
2123 if (!ctrl->apsta)
2124 return 0;
2125
2126 if (ctrl->npss > 31) {
2127 dev_warn(ctrl->device, "NPSS is invalid; not using APST\n");
2128 return 0;
2129 }
2130
2131 table = kzalloc(sizeof(*table), GFP_KERNEL);
2132 if (!table)
2133 return 0;
2134
2135 if (!ctrl->apst_enabled || ctrl->ps_max_latency_us == 0) {
2136
2137 apste = 0;
2138 dev_dbg(ctrl->device, "APST disabled\n");
2139 } else {
2140 __le64 target = cpu_to_le64(0);
2141 int state;
2142
2143
2144
2145
2146
2147
2148
2149 for (state = (int)ctrl->npss; state >= 0; state--) {
2150 u64 total_latency_us, exit_latency_us, transition_ms;
2151
2152 if (target)
2153 table->entries[state] = target;
2154
2155
2156
2157
2158
2159 if (state == ctrl->npss &&
2160 (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS))
2161 continue;
2162
2163
2164
2165
2166
2167 if (!(ctrl->psd[state].flags &
2168 NVME_PS_FLAGS_NON_OP_STATE))
2169 continue;
2170
2171 exit_latency_us =
2172 (u64)le32_to_cpu(ctrl->psd[state].exit_lat);
2173 if (exit_latency_us > ctrl->ps_max_latency_us)
2174 continue;
2175
2176 total_latency_us =
2177 exit_latency_us +
2178 le32_to_cpu(ctrl->psd[state].entry_lat);
2179
2180
2181
2182
2183
2184 transition_ms = total_latency_us + 19;
2185 do_div(transition_ms, 20);
2186 if (transition_ms > (1 << 24) - 1)
2187 transition_ms = (1 << 24) - 1;
2188
2189 target = cpu_to_le64((state << 3) |
2190 (transition_ms << 8));
2191
2192 if (max_ps == -1)
2193 max_ps = state;
2194
2195 if (total_latency_us > max_lat_us)
2196 max_lat_us = total_latency_us;
2197 }
2198
2199 apste = 1;
2200
2201 if (max_ps == -1) {
2202 dev_dbg(ctrl->device, "APST enabled but no non-operational states are available\n");
2203 } else {
2204 dev_dbg(ctrl->device, "APST enabled: max PS = %d, max round-trip latency = %lluus, table = %*phN\n",
2205 max_ps, max_lat_us, (int)sizeof(*table), table);
2206 }
2207 }
2208
2209 ret = nvme_set_features(ctrl, NVME_FEAT_AUTO_PST, apste,
2210 table, sizeof(*table), NULL);
2211 if (ret)
2212 dev_err(ctrl->device, "failed to set APST feature (%d)\n", ret);
2213
2214 kfree(table);
2215 return ret;
2216}
2217
2218static void nvme_set_latency_tolerance(struct device *dev, s32 val)
2219{
2220 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
2221 u64 latency;
2222
2223 switch (val) {
2224 case PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT:
2225 case PM_QOS_LATENCY_ANY:
2226 latency = U64_MAX;
2227 break;
2228
2229 default:
2230 latency = val;
2231 }
2232
2233 if (ctrl->ps_max_latency_us != latency) {
2234 ctrl->ps_max_latency_us = latency;
2235 nvme_configure_apst(ctrl);
2236 }
2237}
2238
2239struct nvme_core_quirk_entry {
2240
2241
2242
2243
2244
2245 u16 vid;
2246 const char *mn;
2247 const char *fr;
2248 unsigned long quirks;
2249};
2250
2251static const struct nvme_core_quirk_entry core_quirks[] = {
2252 {
2253
2254
2255
2256
2257 .vid = 0x1179,
2258 .mn = "THNSF5256GPUK TOSHIBA",
2259 .quirks = NVME_QUIRK_NO_APST,
2260 },
2261 {
2262
2263
2264
2265
2266
2267 .vid = 0x14a4,
2268 .fr = "22301111",
2269 .quirks = NVME_QUIRK_SIMPLE_SUSPEND,
2270 }
2271};
2272
2273
2274static bool string_matches(const char *idstr, const char *match, size_t len)
2275{
2276 size_t matchlen;
2277
2278 if (!match)
2279 return true;
2280
2281 matchlen = strlen(match);
2282 WARN_ON_ONCE(matchlen > len);
2283
2284 if (memcmp(idstr, match, matchlen))
2285 return false;
2286
2287 for (; matchlen < len; matchlen++)
2288 if (idstr[matchlen] != ' ')
2289 return false;
2290
2291 return true;
2292}
2293
2294static bool quirk_matches(const struct nvme_id_ctrl *id,
2295 const struct nvme_core_quirk_entry *q)
2296{
2297 return q->vid == le16_to_cpu(id->vid) &&
2298 string_matches(id->mn, q->mn, sizeof(id->mn)) &&
2299 string_matches(id->fr, q->fr, sizeof(id->fr));
2300}
2301
2302static void nvme_init_subnqn(struct nvme_subsystem *subsys, struct nvme_ctrl *ctrl,
2303 struct nvme_id_ctrl *id)
2304{
2305 size_t nqnlen;
2306 int off;
2307
2308 if(!(ctrl->quirks & NVME_QUIRK_IGNORE_DEV_SUBNQN)) {
2309 nqnlen = strnlen(id->subnqn, NVMF_NQN_SIZE);
2310 if (nqnlen > 0 && nqnlen < NVMF_NQN_SIZE) {
2311 strlcpy(subsys->subnqn, id->subnqn, NVMF_NQN_SIZE);
2312 return;
2313 }
2314
2315 if (ctrl->vs >= NVME_VS(1, 2, 1))
2316 dev_warn(ctrl->device, "missing or invalid SUBNQN field.\n");
2317 }
2318
2319
2320 off = snprintf(subsys->subnqn, NVMF_NQN_SIZE,
2321 "nqn.2014.08.org.nvmexpress:%04x%04x",
2322 le16_to_cpu(id->vid), le16_to_cpu(id->ssvid));
2323 memcpy(subsys->subnqn + off, id->sn, sizeof(id->sn));
2324 off += sizeof(id->sn);
2325 memcpy(subsys->subnqn + off, id->mn, sizeof(id->mn));
2326 off += sizeof(id->mn);
2327 memset(subsys->subnqn + off, 0, sizeof(subsys->subnqn) - off);
2328}
2329
2330static void nvme_release_subsystem(struct device *dev)
2331{
2332 struct nvme_subsystem *subsys =
2333 container_of(dev, struct nvme_subsystem, dev);
2334
2335 ida_simple_remove(&nvme_subsystems_ida, subsys->instance);
2336 kfree(subsys);
2337}
2338
2339static void nvme_destroy_subsystem(struct kref *ref)
2340{
2341 struct nvme_subsystem *subsys =
2342 container_of(ref, struct nvme_subsystem, ref);
2343
2344 mutex_lock(&nvme_subsystems_lock);
2345 list_del(&subsys->entry);
2346 mutex_unlock(&nvme_subsystems_lock);
2347
2348 ida_destroy(&subsys->ns_ida);
2349 device_del(&subsys->dev);
2350 put_device(&subsys->dev);
2351}
2352
2353static void nvme_put_subsystem(struct nvme_subsystem *subsys)
2354{
2355 kref_put(&subsys->ref, nvme_destroy_subsystem);
2356}
2357
2358static struct nvme_subsystem *__nvme_find_get_subsystem(const char *subsysnqn)
2359{
2360 struct nvme_subsystem *subsys;
2361
2362 lockdep_assert_held(&nvme_subsystems_lock);
2363
2364 list_for_each_entry(subsys, &nvme_subsystems, entry) {
2365 if (strcmp(subsys->subnqn, subsysnqn))
2366 continue;
2367 if (!kref_get_unless_zero(&subsys->ref))
2368 continue;
2369 return subsys;
2370 }
2371
2372 return NULL;
2373}
2374
2375#define SUBSYS_ATTR_RO(_name, _mode, _show) \
2376 struct device_attribute subsys_attr_##_name = \
2377 __ATTR(_name, _mode, _show, NULL)
2378
2379static ssize_t nvme_subsys_show_nqn(struct device *dev,
2380 struct device_attribute *attr,
2381 char *buf)
2382{
2383 struct nvme_subsystem *subsys =
2384 container_of(dev, struct nvme_subsystem, dev);
2385
2386 return snprintf(buf, PAGE_SIZE, "%s\n", subsys->subnqn);
2387}
2388static SUBSYS_ATTR_RO(subsysnqn, S_IRUGO, nvme_subsys_show_nqn);
2389
2390#define nvme_subsys_show_str_function(field) \
2391static ssize_t subsys_##field##_show(struct device *dev, \
2392 struct device_attribute *attr, char *buf) \
2393{ \
2394 struct nvme_subsystem *subsys = \
2395 container_of(dev, struct nvme_subsystem, dev); \
2396 return sprintf(buf, "%.*s\n", \
2397 (int)sizeof(subsys->field), subsys->field); \
2398} \
2399static SUBSYS_ATTR_RO(field, S_IRUGO, subsys_##field##_show);
2400
2401nvme_subsys_show_str_function(model);
2402nvme_subsys_show_str_function(serial);
2403nvme_subsys_show_str_function(firmware_rev);
2404
2405static struct attribute *nvme_subsys_attrs[] = {
2406 &subsys_attr_model.attr,
2407 &subsys_attr_serial.attr,
2408 &subsys_attr_firmware_rev.attr,
2409 &subsys_attr_subsysnqn.attr,
2410#ifdef CONFIG_NVME_MULTIPATH
2411 &subsys_attr_iopolicy.attr,
2412#endif
2413 NULL,
2414};
2415
2416static struct attribute_group nvme_subsys_attrs_group = {
2417 .attrs = nvme_subsys_attrs,
2418};
2419
2420static const struct attribute_group *nvme_subsys_attrs_groups[] = {
2421 &nvme_subsys_attrs_group,
2422 NULL,
2423};
2424
2425static bool nvme_validate_cntlid(struct nvme_subsystem *subsys,
2426 struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
2427{
2428 struct nvme_ctrl *tmp;
2429
2430 lockdep_assert_held(&nvme_subsystems_lock);
2431
2432 list_for_each_entry(tmp, &subsys->ctrls, subsys_entry) {
2433 if (tmp->state == NVME_CTRL_DELETING ||
2434 tmp->state == NVME_CTRL_DEAD)
2435 continue;
2436
2437 if (tmp->cntlid == ctrl->cntlid) {
2438 dev_err(ctrl->device,
2439 "Duplicate cntlid %u with %s, rejecting\n",
2440 ctrl->cntlid, dev_name(tmp->device));
2441 return false;
2442 }
2443
2444 if ((id->cmic & (1 << 1)) ||
2445 (ctrl->opts && ctrl->opts->discovery_nqn))
2446 continue;
2447
2448 dev_err(ctrl->device,
2449 "Subsystem does not support multiple controllers\n");
2450 return false;
2451 }
2452
2453 return true;
2454}
2455
2456static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
2457{
2458 struct nvme_subsystem *subsys, *found;
2459 int ret;
2460
2461 subsys = kzalloc(sizeof(*subsys), GFP_KERNEL);
2462 if (!subsys)
2463 return -ENOMEM;
2464 ret = ida_simple_get(&nvme_subsystems_ida, 0, 0, GFP_KERNEL);
2465 if (ret < 0) {
2466 kfree(subsys);
2467 return ret;
2468 }
2469 subsys->instance = ret;
2470 mutex_init(&subsys->lock);
2471 kref_init(&subsys->ref);
2472 INIT_LIST_HEAD(&subsys->ctrls);
2473 INIT_LIST_HEAD(&subsys->nsheads);
2474 nvme_init_subnqn(subsys, ctrl, id);
2475 memcpy(subsys->serial, id->sn, sizeof(subsys->serial));
2476 memcpy(subsys->model, id->mn, sizeof(subsys->model));
2477 memcpy(subsys->firmware_rev, id->fr, sizeof(subsys->firmware_rev));
2478 subsys->vendor_id = le16_to_cpu(id->vid);
2479 subsys->cmic = id->cmic;
2480 subsys->awupf = le16_to_cpu(id->awupf);
2481#ifdef CONFIG_NVME_MULTIPATH
2482 subsys->iopolicy = NVME_IOPOLICY_NUMA;
2483#endif
2484
2485 subsys->dev.class = nvme_subsys_class;
2486 subsys->dev.release = nvme_release_subsystem;
2487 subsys->dev.groups = nvme_subsys_attrs_groups;
2488 dev_set_name(&subsys->dev, "nvme-subsys%d", subsys->instance);
2489 device_initialize(&subsys->dev);
2490
2491 mutex_lock(&nvme_subsystems_lock);
2492 found = __nvme_find_get_subsystem(subsys->subnqn);
2493 if (found) {
2494 put_device(&subsys->dev);
2495 subsys = found;
2496
2497 if (!nvme_validate_cntlid(subsys, ctrl, id)) {
2498 ret = -EINVAL;
2499 goto out_put_subsystem;
2500 }
2501 } else {
2502 ret = device_add(&subsys->dev);
2503 if (ret) {
2504 dev_err(ctrl->device,
2505 "failed to register subsystem device.\n");
2506 put_device(&subsys->dev);
2507 goto out_unlock;
2508 }
2509 ida_init(&subsys->ns_ida);
2510 list_add_tail(&subsys->entry, &nvme_subsystems);
2511 }
2512
2513 if (sysfs_create_link(&subsys->dev.kobj, &ctrl->device->kobj,
2514 dev_name(ctrl->device))) {
2515 dev_err(ctrl->device,
2516 "failed to create sysfs link from subsystem.\n");
2517 goto out_put_subsystem;
2518 }
2519
2520 ctrl->subsys = subsys;
2521 list_add_tail(&ctrl->subsys_entry, &subsys->ctrls);
2522 mutex_unlock(&nvme_subsystems_lock);
2523 return 0;
2524
2525out_put_subsystem:
2526 nvme_put_subsystem(subsys);
2527out_unlock:
2528 mutex_unlock(&nvme_subsystems_lock);
2529 return ret;
2530}
2531
2532int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp,
2533 void *log, size_t size, u64 offset)
2534{
2535 struct nvme_command c = { };
2536 unsigned long dwlen = size / 4 - 1;
2537
2538 c.get_log_page.opcode = nvme_admin_get_log_page;
2539 c.get_log_page.nsid = cpu_to_le32(nsid);
2540 c.get_log_page.lid = log_page;
2541 c.get_log_page.lsp = lsp;
2542 c.get_log_page.numdl = cpu_to_le16(dwlen & ((1 << 16) - 1));
2543 c.get_log_page.numdu = cpu_to_le16(dwlen >> 16);
2544 c.get_log_page.lpol = cpu_to_le32(lower_32_bits(offset));
2545 c.get_log_page.lpou = cpu_to_le32(upper_32_bits(offset));
2546
2547 return nvme_submit_sync_cmd(ctrl->admin_q, &c, log, size);
2548}
2549
2550static int nvme_get_effects_log(struct nvme_ctrl *ctrl)
2551{
2552 int ret;
2553
2554 if (!ctrl->effects)
2555 ctrl->effects = kzalloc(sizeof(*ctrl->effects), GFP_KERNEL);
2556
2557 if (!ctrl->effects)
2558 return 0;
2559
2560 ret = nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_CMD_EFFECTS, 0,
2561 ctrl->effects, sizeof(*ctrl->effects), 0);
2562 if (ret) {
2563 kfree(ctrl->effects);
2564 ctrl->effects = NULL;
2565 }
2566 return ret;
2567}
2568
2569
2570
2571
2572
2573
2574int nvme_init_identify(struct nvme_ctrl *ctrl)
2575{
2576 struct nvme_id_ctrl *id;
2577 u64 cap;
2578 int ret, page_shift;
2579 u32 max_hw_sectors;
2580 bool prev_apst_enabled;
2581
2582 ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs);
2583 if (ret) {
2584 dev_err(ctrl->device, "Reading VS failed (%d)\n", ret);
2585 return ret;
2586 }
2587
2588 ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &cap);
2589 if (ret) {
2590 dev_err(ctrl->device, "Reading CAP failed (%d)\n", ret);
2591 return ret;
2592 }
2593 page_shift = NVME_CAP_MPSMIN(cap) + 12;
2594
2595 if (ctrl->vs >= NVME_VS(1, 1, 0))
2596 ctrl->subsystem = NVME_CAP_NSSRC(cap);
2597
2598 ret = nvme_identify_ctrl(ctrl, &id);
2599 if (ret) {
2600 dev_err(ctrl->device, "Identify Controller failed (%d)\n", ret);
2601 return -EIO;
2602 }
2603
2604 if (id->lpa & NVME_CTRL_LPA_CMD_EFFECTS_LOG) {
2605 ret = nvme_get_effects_log(ctrl);
2606 if (ret < 0)
2607 goto out_free;
2608 }
2609
2610 if (!(ctrl->ops->flags & NVME_F_FABRICS))
2611 ctrl->cntlid = le16_to_cpu(id->cntlid);
2612
2613 if (!ctrl->identified) {
2614 int i;
2615
2616 ret = nvme_init_subsystem(ctrl, id);
2617 if (ret)
2618 goto out_free;
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628 for (i = 0; i < ARRAY_SIZE(core_quirks); i++) {
2629 if (quirk_matches(id, &core_quirks[i]))
2630 ctrl->quirks |= core_quirks[i].quirks;
2631 }
2632 }
2633
2634 if (force_apst && (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS)) {
2635 dev_warn(ctrl->device, "forcibly allowing all power states due to nvme_core.force_apst -- use at your own risk\n");
2636 ctrl->quirks &= ~NVME_QUIRK_NO_DEEPEST_PS;
2637 }
2638
2639 ctrl->crdt[0] = le16_to_cpu(id->crdt1);
2640 ctrl->crdt[1] = le16_to_cpu(id->crdt2);
2641 ctrl->crdt[2] = le16_to_cpu(id->crdt3);
2642
2643 ctrl->oacs = le16_to_cpu(id->oacs);
2644 ctrl->oncs = le16_to_cpu(id->oncs);
2645 ctrl->mtfa = le16_to_cpu(id->mtfa);
2646 ctrl->oaes = le32_to_cpu(id->oaes);
2647 atomic_set(&ctrl->abort_limit, id->acl + 1);
2648 ctrl->vwc = id->vwc;
2649 if (id->mdts)
2650 max_hw_sectors = 1 << (id->mdts + page_shift - 9);
2651 else
2652 max_hw_sectors = UINT_MAX;
2653 ctrl->max_hw_sectors =
2654 min_not_zero(ctrl->max_hw_sectors, max_hw_sectors);
2655
2656 nvme_set_queue_limits(ctrl, ctrl->admin_q);
2657 ctrl->sgls = le32_to_cpu(id->sgls);
2658 ctrl->kas = le16_to_cpu(id->kas);
2659 ctrl->max_namespaces = le32_to_cpu(id->mnan);
2660 ctrl->ctratt = le32_to_cpu(id->ctratt);
2661
2662 if (id->rtd3e) {
2663
2664 u32 transition_time = le32_to_cpu(id->rtd3e) / 1000000;
2665
2666 ctrl->shutdown_timeout = clamp_t(unsigned int, transition_time,
2667 shutdown_timeout, 60);
2668
2669 if (ctrl->shutdown_timeout != shutdown_timeout)
2670 dev_info(ctrl->device,
2671 "Shutdown timeout set to %u seconds\n",
2672 ctrl->shutdown_timeout);
2673 } else
2674 ctrl->shutdown_timeout = shutdown_timeout;
2675
2676 ctrl->npss = id->npss;
2677 ctrl->apsta = id->apsta;
2678 prev_apst_enabled = ctrl->apst_enabled;
2679 if (ctrl->quirks & NVME_QUIRK_NO_APST) {
2680 if (force_apst && id->apsta) {
2681 dev_warn(ctrl->device, "forcibly allowing APST due to nvme_core.force_apst -- use at your own risk\n");
2682 ctrl->apst_enabled = true;
2683 } else {
2684 ctrl->apst_enabled = false;
2685 }
2686 } else {
2687 ctrl->apst_enabled = id->apsta;
2688 }
2689 memcpy(ctrl->psd, id->psd, sizeof(ctrl->psd));
2690
2691 if (ctrl->ops->flags & NVME_F_FABRICS) {
2692 ctrl->icdoff = le16_to_cpu(id->icdoff);
2693 ctrl->ioccsz = le32_to_cpu(id->ioccsz);
2694 ctrl->iorcsz = le32_to_cpu(id->iorcsz);
2695 ctrl->maxcmd = le16_to_cpu(id->maxcmd);
2696
2697
2698
2699
2700
2701 if (ctrl->cntlid != le16_to_cpu(id->cntlid)) {
2702 ret = -EINVAL;
2703 goto out_free;
2704 }
2705
2706 if (!ctrl->opts->discovery_nqn && !ctrl->kas) {
2707 dev_err(ctrl->device,
2708 "keep-alive support is mandatory for fabrics\n");
2709 ret = -EINVAL;
2710 goto out_free;
2711 }
2712 } else {
2713 ctrl->hmpre = le32_to_cpu(id->hmpre);
2714 ctrl->hmmin = le32_to_cpu(id->hmmin);
2715 ctrl->hmminds = le32_to_cpu(id->hmminds);
2716 ctrl->hmmaxd = le16_to_cpu(id->hmmaxd);
2717 }
2718
2719 ret = nvme_mpath_init(ctrl, id);
2720 kfree(id);
2721
2722 if (ret < 0)
2723 return ret;
2724
2725 if (ctrl->apst_enabled && !prev_apst_enabled)
2726 dev_pm_qos_expose_latency_tolerance(ctrl->device);
2727 else if (!ctrl->apst_enabled && prev_apst_enabled)
2728 dev_pm_qos_hide_latency_tolerance(ctrl->device);
2729
2730 ret = nvme_configure_apst(ctrl);
2731 if (ret < 0)
2732 return ret;
2733
2734 ret = nvme_configure_timestamp(ctrl);
2735 if (ret < 0)
2736 return ret;
2737
2738 ret = nvme_configure_directives(ctrl);
2739 if (ret < 0)
2740 return ret;
2741
2742 ret = nvme_configure_acre(ctrl);
2743 if (ret < 0)
2744 return ret;
2745
2746 ctrl->identified = true;
2747
2748 return 0;
2749
2750out_free:
2751 kfree(id);
2752 return ret;
2753}
2754EXPORT_SYMBOL_GPL(nvme_init_identify);
2755
2756static int nvme_dev_open(struct inode *inode, struct file *file)
2757{
2758 struct nvme_ctrl *ctrl =
2759 container_of(inode->i_cdev, struct nvme_ctrl, cdev);
2760
2761 switch (ctrl->state) {
2762 case NVME_CTRL_LIVE:
2763 case NVME_CTRL_ADMIN_ONLY:
2764 break;
2765 default:
2766 return -EWOULDBLOCK;
2767 }
2768
2769 file->private_data = ctrl;
2770 return 0;
2771}
2772
2773static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp)
2774{
2775 struct nvme_ns *ns;
2776 int ret;
2777
2778 down_read(&ctrl->namespaces_rwsem);
2779 if (list_empty(&ctrl->namespaces)) {
2780 ret = -ENOTTY;
2781 goto out_unlock;
2782 }
2783
2784 ns = list_first_entry(&ctrl->namespaces, struct nvme_ns, list);
2785 if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) {
2786 dev_warn(ctrl->device,
2787 "NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n");
2788 ret = -EINVAL;
2789 goto out_unlock;
2790 }
2791
2792 dev_warn(ctrl->device,
2793 "using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n");
2794 kref_get(&ns->kref);
2795 up_read(&ctrl->namespaces_rwsem);
2796
2797 ret = nvme_user_cmd(ctrl, ns, argp);
2798 nvme_put_ns(ns);
2799 return ret;
2800
2801out_unlock:
2802 up_read(&ctrl->namespaces_rwsem);
2803 return ret;
2804}
2805
2806static long nvme_dev_ioctl(struct file *file, unsigned int cmd,
2807 unsigned long arg)
2808{
2809 struct nvme_ctrl *ctrl = file->private_data;
2810 void __user *argp = (void __user *)arg;
2811
2812 switch (cmd) {
2813 case NVME_IOCTL_ADMIN_CMD:
2814 return nvme_user_cmd(ctrl, NULL, argp);
2815 case NVME_IOCTL_IO_CMD:
2816 return nvme_dev_user_cmd(ctrl, argp);
2817 case NVME_IOCTL_RESET:
2818 dev_warn(ctrl->device, "resetting controller\n");
2819 return nvme_reset_ctrl_sync(ctrl);
2820 case NVME_IOCTL_SUBSYS_RESET:
2821 return nvme_reset_subsystem(ctrl);
2822 case NVME_IOCTL_RESCAN:
2823 nvme_queue_scan(ctrl);
2824 return 0;
2825 default:
2826 return -ENOTTY;
2827 }
2828}
2829
2830static const struct file_operations nvme_dev_fops = {
2831 .owner = THIS_MODULE,
2832 .open = nvme_dev_open,
2833 .unlocked_ioctl = nvme_dev_ioctl,
2834 .compat_ioctl = nvme_dev_ioctl,
2835};
2836
2837static ssize_t nvme_sysfs_reset(struct device *dev,
2838 struct device_attribute *attr, const char *buf,
2839 size_t count)
2840{
2841 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
2842 int ret;
2843
2844 ret = nvme_reset_ctrl_sync(ctrl);
2845 if (ret < 0)
2846 return ret;
2847 return count;
2848}
2849static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset);
2850
2851static ssize_t nvme_sysfs_rescan(struct device *dev,
2852 struct device_attribute *attr, const char *buf,
2853 size_t count)
2854{
2855 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
2856
2857 nvme_queue_scan(ctrl);
2858 return count;
2859}
2860static DEVICE_ATTR(rescan_controller, S_IWUSR, NULL, nvme_sysfs_rescan);
2861
2862static inline struct nvme_ns_head *dev_to_ns_head(struct device *dev)
2863{
2864 struct gendisk *disk = dev_to_disk(dev);
2865
2866 if (disk->fops == &nvme_fops)
2867 return nvme_get_ns_from_dev(dev)->head;
2868 else
2869 return disk->private_data;
2870}
2871
2872static ssize_t wwid_show(struct device *dev, struct device_attribute *attr,
2873 char *buf)
2874{
2875 struct nvme_ns_head *head = dev_to_ns_head(dev);
2876 struct nvme_ns_ids *ids = &head->ids;
2877 struct nvme_subsystem *subsys = head->subsys;
2878 int serial_len = sizeof(subsys->serial);
2879 int model_len = sizeof(subsys->model);
2880
2881 if (!uuid_is_null(&ids->uuid))
2882 return sprintf(buf, "uuid.%pU\n", &ids->uuid);
2883
2884 if (memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
2885 return sprintf(buf, "eui.%16phN\n", ids->nguid);
2886
2887 if (memchr_inv(ids->eui64, 0, sizeof(ids->eui64)))
2888 return sprintf(buf, "eui.%8phN\n", ids->eui64);
2889
2890 while (serial_len > 0 && (subsys->serial[serial_len - 1] == ' ' ||
2891 subsys->serial[serial_len - 1] == '\0'))
2892 serial_len--;
2893 while (model_len > 0 && (subsys->model[model_len - 1] == ' ' ||
2894 subsys->model[model_len - 1] == '\0'))
2895 model_len--;
2896
2897 return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", subsys->vendor_id,
2898 serial_len, subsys->serial, model_len, subsys->model,
2899 head->ns_id);
2900}
2901static DEVICE_ATTR_RO(wwid);
2902
2903static ssize_t nguid_show(struct device *dev, struct device_attribute *attr,
2904 char *buf)
2905{
2906 return sprintf(buf, "%pU\n", dev_to_ns_head(dev)->ids.nguid);
2907}
2908static DEVICE_ATTR_RO(nguid);
2909
2910static ssize_t uuid_show(struct device *dev, struct device_attribute *attr,
2911 char *buf)
2912{
2913 struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids;
2914
2915
2916
2917
2918 if (uuid_is_null(&ids->uuid)) {
2919 printk_ratelimited(KERN_WARNING
2920 "No UUID available providing old NGUID\n");
2921 return sprintf(buf, "%pU\n", ids->nguid);
2922 }
2923 return sprintf(buf, "%pU\n", &ids->uuid);
2924}
2925static DEVICE_ATTR_RO(uuid);
2926
2927static ssize_t eui_show(struct device *dev, struct device_attribute *attr,
2928 char *buf)
2929{
2930 return sprintf(buf, "%8ph\n", dev_to_ns_head(dev)->ids.eui64);
2931}
2932static DEVICE_ATTR_RO(eui);
2933
2934static ssize_t nsid_show(struct device *dev, struct device_attribute *attr,
2935 char *buf)
2936{
2937 return sprintf(buf, "%d\n", dev_to_ns_head(dev)->ns_id);
2938}
2939static DEVICE_ATTR_RO(nsid);
2940
2941static struct attribute *nvme_ns_id_attrs[] = {
2942 &dev_attr_wwid.attr,
2943 &dev_attr_uuid.attr,
2944 &dev_attr_nguid.attr,
2945 &dev_attr_eui.attr,
2946 &dev_attr_nsid.attr,
2947#ifdef CONFIG_NVME_MULTIPATH
2948 &dev_attr_ana_grpid.attr,
2949 &dev_attr_ana_state.attr,
2950#endif
2951 NULL,
2952};
2953
2954static umode_t nvme_ns_id_attrs_are_visible(struct kobject *kobj,
2955 struct attribute *a, int n)
2956{
2957 struct device *dev = container_of(kobj, struct device, kobj);
2958 struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids;
2959
2960 if (a == &dev_attr_uuid.attr) {
2961 if (uuid_is_null(&ids->uuid) &&
2962 !memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
2963 return 0;
2964 }
2965 if (a == &dev_attr_nguid.attr) {
2966 if (!memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
2967 return 0;
2968 }
2969 if (a == &dev_attr_eui.attr) {
2970 if (!memchr_inv(ids->eui64, 0, sizeof(ids->eui64)))
2971 return 0;
2972 }
2973#ifdef CONFIG_NVME_MULTIPATH
2974 if (a == &dev_attr_ana_grpid.attr || a == &dev_attr_ana_state.attr) {
2975 if (dev_to_disk(dev)->fops != &nvme_fops)
2976 return 0;
2977 if (!nvme_ctrl_use_ana(nvme_get_ns_from_dev(dev)->ctrl))
2978 return 0;
2979 }
2980#endif
2981 return a->mode;
2982}
2983
2984static const struct attribute_group nvme_ns_id_attr_group = {
2985 .attrs = nvme_ns_id_attrs,
2986 .is_visible = nvme_ns_id_attrs_are_visible,
2987};
2988
2989const struct attribute_group *nvme_ns_id_attr_groups[] = {
2990 &nvme_ns_id_attr_group,
2991#ifdef CONFIG_NVM
2992 &nvme_nvm_attr_group,
2993#endif
2994 NULL,
2995};
2996
2997#define nvme_show_str_function(field) \
2998static ssize_t field##_show(struct device *dev, \
2999 struct device_attribute *attr, char *buf) \
3000{ \
3001 struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \
3002 return sprintf(buf, "%.*s\n", \
3003 (int)sizeof(ctrl->subsys->field), ctrl->subsys->field); \
3004} \
3005static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
3006
3007nvme_show_str_function(model);
3008nvme_show_str_function(serial);
3009nvme_show_str_function(firmware_rev);
3010
3011#define nvme_show_int_function(field) \
3012static ssize_t field##_show(struct device *dev, \
3013 struct device_attribute *attr, char *buf) \
3014{ \
3015 struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \
3016 return sprintf(buf, "%d\n", ctrl->field); \
3017} \
3018static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
3019
3020nvme_show_int_function(cntlid);
3021nvme_show_int_function(numa_node);
3022
3023static ssize_t nvme_sysfs_delete(struct device *dev,
3024 struct device_attribute *attr, const char *buf,
3025 size_t count)
3026{
3027 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3028
3029 if (device_remove_file_self(dev, attr))
3030 nvme_delete_ctrl_sync(ctrl);
3031 return count;
3032}
3033static DEVICE_ATTR(delete_controller, S_IWUSR, NULL, nvme_sysfs_delete);
3034
3035static ssize_t nvme_sysfs_show_transport(struct device *dev,
3036 struct device_attribute *attr,
3037 char *buf)
3038{
3039 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3040
3041 return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->ops->name);
3042}
3043static DEVICE_ATTR(transport, S_IRUGO, nvme_sysfs_show_transport, NULL);
3044
3045static ssize_t nvme_sysfs_show_state(struct device *dev,
3046 struct device_attribute *attr,
3047 char *buf)
3048{
3049 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3050 static const char *const state_name[] = {
3051 [NVME_CTRL_NEW] = "new",
3052 [NVME_CTRL_LIVE] = "live",
3053 [NVME_CTRL_ADMIN_ONLY] = "only-admin",
3054 [NVME_CTRL_RESETTING] = "resetting",
3055 [NVME_CTRL_CONNECTING] = "connecting",
3056 [NVME_CTRL_DELETING] = "deleting",
3057 [NVME_CTRL_DEAD] = "dead",
3058 };
3059
3060 if ((unsigned)ctrl->state < ARRAY_SIZE(state_name) &&
3061 state_name[ctrl->state])
3062 return sprintf(buf, "%s\n", state_name[ctrl->state]);
3063
3064 return sprintf(buf, "unknown state\n");
3065}
3066
3067static DEVICE_ATTR(state, S_IRUGO, nvme_sysfs_show_state, NULL);
3068
3069static ssize_t nvme_sysfs_show_subsysnqn(struct device *dev,
3070 struct device_attribute *attr,
3071 char *buf)
3072{
3073 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3074
3075 return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->subsys->subnqn);
3076}
3077static DEVICE_ATTR(subsysnqn, S_IRUGO, nvme_sysfs_show_subsysnqn, NULL);
3078
3079static ssize_t nvme_sysfs_show_address(struct device *dev,
3080 struct device_attribute *attr,
3081 char *buf)
3082{
3083 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3084
3085 return ctrl->ops->get_address(ctrl, buf, PAGE_SIZE);
3086}
3087static DEVICE_ATTR(address, S_IRUGO, nvme_sysfs_show_address, NULL);
3088
3089static struct attribute *nvme_dev_attrs[] = {
3090 &dev_attr_reset_controller.attr,
3091 &dev_attr_rescan_controller.attr,
3092 &dev_attr_model.attr,
3093 &dev_attr_serial.attr,
3094 &dev_attr_firmware_rev.attr,
3095 &dev_attr_cntlid.attr,
3096 &dev_attr_delete_controller.attr,
3097 &dev_attr_transport.attr,
3098 &dev_attr_subsysnqn.attr,
3099 &dev_attr_address.attr,
3100 &dev_attr_state.attr,
3101 &dev_attr_numa_node.attr,
3102 NULL
3103};
3104
3105static umode_t nvme_dev_attrs_are_visible(struct kobject *kobj,
3106 struct attribute *a, int n)
3107{
3108 struct device *dev = container_of(kobj, struct device, kobj);
3109 struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
3110
3111 if (a == &dev_attr_delete_controller.attr && !ctrl->ops->delete_ctrl)
3112 return 0;
3113 if (a == &dev_attr_address.attr && !ctrl->ops->get_address)
3114 return 0;
3115
3116 return a->mode;
3117}
3118
3119static struct attribute_group nvme_dev_attrs_group = {
3120 .attrs = nvme_dev_attrs,
3121 .is_visible = nvme_dev_attrs_are_visible,
3122};
3123
3124static const struct attribute_group *nvme_dev_attr_groups[] = {
3125 &nvme_dev_attrs_group,
3126 NULL,
3127};
3128
3129static struct nvme_ns_head *__nvme_find_ns_head(struct nvme_subsystem *subsys,
3130 unsigned nsid)
3131{
3132 struct nvme_ns_head *h;
3133
3134 lockdep_assert_held(&subsys->lock);
3135
3136 list_for_each_entry(h, &subsys->nsheads, entry) {
3137 if (h->ns_id == nsid && kref_get_unless_zero(&h->ref))
3138 return h;
3139 }
3140
3141 return NULL;
3142}
3143
3144static int __nvme_check_ids(struct nvme_subsystem *subsys,
3145 struct nvme_ns_head *new)
3146{
3147 struct nvme_ns_head *h;
3148
3149 lockdep_assert_held(&subsys->lock);
3150
3151 list_for_each_entry(h, &subsys->nsheads, entry) {
3152 if (nvme_ns_ids_valid(&new->ids) &&
3153 !list_empty(&h->list) &&
3154 nvme_ns_ids_equal(&new->ids, &h->ids))
3155 return -EINVAL;
3156 }
3157
3158 return 0;
3159}
3160
3161static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl,
3162 unsigned nsid, struct nvme_id_ns *id)
3163{
3164 struct nvme_ns_head *head;
3165 size_t size = sizeof(*head);
3166 int ret = -ENOMEM;
3167
3168#ifdef CONFIG_NVME_MULTIPATH
3169 size += num_possible_nodes() * sizeof(struct nvme_ns *);
3170#endif
3171
3172 head = kzalloc(size, GFP_KERNEL);
3173 if (!head)
3174 goto out;
3175 ret = ida_simple_get(&ctrl->subsys->ns_ida, 1, 0, GFP_KERNEL);
3176 if (ret < 0)
3177 goto out_free_head;
3178 head->instance = ret;
3179 INIT_LIST_HEAD(&head->list);
3180 ret = init_srcu_struct(&head->srcu);
3181 if (ret)
3182 goto out_ida_remove;
3183 head->subsys = ctrl->subsys;
3184 head->ns_id = nsid;
3185 kref_init(&head->ref);
3186
3187 nvme_report_ns_ids(ctrl, nsid, id, &head->ids);
3188
3189 ret = __nvme_check_ids(ctrl->subsys, head);
3190 if (ret) {
3191 dev_err(ctrl->device,
3192 "duplicate IDs for nsid %d\n", nsid);
3193 goto out_cleanup_srcu;
3194 }
3195
3196 ret = nvme_mpath_alloc_disk(ctrl, head);
3197 if (ret)
3198 goto out_cleanup_srcu;
3199
3200 list_add_tail(&head->entry, &ctrl->subsys->nsheads);
3201
3202 kref_get(&ctrl->subsys->ref);
3203
3204 return head;
3205out_cleanup_srcu:
3206 cleanup_srcu_struct(&head->srcu);
3207out_ida_remove:
3208 ida_simple_remove(&ctrl->subsys->ns_ida, head->instance);
3209out_free_head:
3210 kfree(head);
3211out:
3212 return ERR_PTR(ret);
3213}
3214
3215static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid,
3216 struct nvme_id_ns *id)
3217{
3218 struct nvme_ctrl *ctrl = ns->ctrl;
3219 bool is_shared = id->nmic & (1 << 0);
3220 struct nvme_ns_head *head = NULL;
3221 int ret = 0;
3222
3223 mutex_lock(&ctrl->subsys->lock);
3224 if (is_shared)
3225 head = __nvme_find_ns_head(ctrl->subsys, nsid);
3226 if (!head) {
3227 head = nvme_alloc_ns_head(ctrl, nsid, id);
3228 if (IS_ERR(head)) {
3229 ret = PTR_ERR(head);
3230 goto out_unlock;
3231 }
3232 } else {
3233 struct nvme_ns_ids ids;
3234
3235 nvme_report_ns_ids(ctrl, nsid, id, &ids);
3236 if (!nvme_ns_ids_equal(&head->ids, &ids)) {
3237 dev_err(ctrl->device,
3238 "IDs don't match for shared namespace %d\n",
3239 nsid);
3240 ret = -EINVAL;
3241 goto out_unlock;
3242 }
3243 }
3244
3245 list_add_tail(&ns->siblings, &head->list);
3246 ns->head = head;
3247
3248out_unlock:
3249 mutex_unlock(&ctrl->subsys->lock);
3250 return ret;
3251}
3252
3253static int ns_cmp(void *priv, struct list_head *a, struct list_head *b)
3254{
3255 struct nvme_ns *nsa = container_of(a, struct nvme_ns, list);
3256 struct nvme_ns *nsb = container_of(b, struct nvme_ns, list);
3257
3258 return nsa->head->ns_id - nsb->head->ns_id;
3259}
3260
3261static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid)
3262{
3263 struct nvme_ns *ns, *ret = NULL;
3264
3265 down_read(&ctrl->namespaces_rwsem);
3266 list_for_each_entry(ns, &ctrl->namespaces, list) {
3267 if (ns->head->ns_id == nsid) {
3268 if (!kref_get_unless_zero(&ns->kref))
3269 continue;
3270 ret = ns;
3271 break;
3272 }
3273 if (ns->head->ns_id > nsid)
3274 break;
3275 }
3276 up_read(&ctrl->namespaces_rwsem);
3277 return ret;
3278}
3279
3280static int nvme_setup_streams_ns(struct nvme_ctrl *ctrl, struct nvme_ns *ns)
3281{
3282 struct streams_directive_params s;
3283 int ret;
3284
3285 if (!ctrl->nr_streams)
3286 return 0;
3287
3288 ret = nvme_get_stream_params(ctrl, &s, ns->head->ns_id);
3289 if (ret)
3290 return ret;
3291
3292 ns->sws = le32_to_cpu(s.sws);
3293 ns->sgs = le16_to_cpu(s.sgs);
3294
3295 if (ns->sws) {
3296 unsigned int bs = 1 << ns->lba_shift;
3297
3298 blk_queue_io_min(ns->queue, bs * ns->sws);
3299 if (ns->sgs)
3300 blk_queue_io_opt(ns->queue, bs * ns->sws * ns->sgs);
3301 }
3302
3303 return 0;
3304}
3305
3306static int nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
3307{
3308 struct nvme_ns *ns;
3309 struct gendisk *disk;
3310 struct nvme_id_ns *id;
3311 char disk_name[DISK_NAME_LEN];
3312 int node = ctrl->numa_node, flags = GENHD_FL_EXT_DEVT, ret;
3313
3314 ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node);
3315 if (!ns)
3316 return -ENOMEM;
3317
3318 ns->queue = blk_mq_init_queue(ctrl->tagset);
3319 if (IS_ERR(ns->queue)) {
3320 ret = PTR_ERR(ns->queue);
3321 goto out_free_ns;
3322 }
3323
3324 if (ctrl->opts && ctrl->opts->data_digest)
3325 ns->queue->backing_dev_info->capabilities
3326 |= BDI_CAP_STABLE_WRITES;
3327
3328 blk_queue_flag_set(QUEUE_FLAG_NONROT, ns->queue);
3329 if (ctrl->ops->flags & NVME_F_PCI_P2PDMA)
3330 blk_queue_flag_set(QUEUE_FLAG_PCI_P2PDMA, ns->queue);
3331
3332 ns->queue->queuedata = ns;
3333 ns->ctrl = ctrl;
3334
3335 kref_init(&ns->kref);
3336 ns->lba_shift = 9;
3337
3338 blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
3339 nvme_set_queue_limits(ctrl, ns->queue);
3340
3341 id = nvme_identify_ns(ctrl, nsid);
3342 if (!id) {
3343 ret = -EIO;
3344 goto out_free_queue;
3345 }
3346
3347 if (id->ncap == 0) {
3348 ret = -EINVAL;
3349 goto out_free_id;
3350 }
3351
3352 ret = nvme_init_ns_head(ns, nsid, id);
3353 if (ret)
3354 goto out_free_id;
3355 nvme_setup_streams_ns(ctrl, ns);
3356 nvme_set_disk_name(disk_name, ns, ctrl, &flags);
3357
3358 disk = alloc_disk_node(0, node);
3359 if (!disk) {
3360 ret = -ENOMEM;
3361 goto out_unlink_ns;
3362 }
3363
3364 disk->fops = &nvme_fops;
3365 disk->private_data = ns;
3366 disk->queue = ns->queue;
3367 disk->flags = flags;
3368 memcpy(disk->disk_name, disk_name, DISK_NAME_LEN);
3369 ns->disk = disk;
3370
3371 __nvme_revalidate_disk(disk, id);
3372
3373 if ((ctrl->quirks & NVME_QUIRK_LIGHTNVM) && id->vs[0] == 0x1) {
3374 ret = nvme_nvm_register(ns, disk_name, node);
3375 if (ret) {
3376 dev_warn(ctrl->device, "LightNVM init failure\n");
3377 goto out_put_disk;
3378 }
3379 }
3380
3381 down_write(&ctrl->namespaces_rwsem);
3382 list_add_tail(&ns->list, &ctrl->namespaces);
3383 up_write(&ctrl->namespaces_rwsem);
3384
3385 nvme_get_ctrl(ctrl);
3386
3387 device_add_disk(ctrl->device, ns->disk, nvme_ns_id_attr_groups);
3388
3389 nvme_mpath_add_disk(ns, id);
3390 nvme_fault_inject_init(&ns->fault_inject, ns->disk->disk_name);
3391 kfree(id);
3392
3393 return 0;
3394 out_put_disk:
3395 put_disk(ns->disk);
3396 out_unlink_ns:
3397 mutex_lock(&ctrl->subsys->lock);
3398 list_del_rcu(&ns->siblings);
3399 mutex_unlock(&ctrl->subsys->lock);
3400 nvme_put_ns_head(ns->head);
3401 out_free_id:
3402 kfree(id);
3403 out_free_queue:
3404 blk_cleanup_queue(ns->queue);
3405 out_free_ns:
3406 kfree(ns);
3407 return ret;
3408}
3409
3410static void nvme_ns_remove(struct nvme_ns *ns)
3411{
3412 if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags))
3413 return;
3414
3415 nvme_fault_inject_fini(&ns->fault_inject);
3416
3417 mutex_lock(&ns->ctrl->subsys->lock);
3418 list_del_rcu(&ns->siblings);
3419 mutex_unlock(&ns->ctrl->subsys->lock);
3420 synchronize_rcu();
3421 nvme_mpath_clear_current_path(ns);
3422 synchronize_srcu(&ns->head->srcu);
3423
3424 if (ns->disk && ns->disk->flags & GENHD_FL_UP) {
3425 del_gendisk(ns->disk);
3426 blk_cleanup_queue(ns->queue);
3427 if (blk_get_integrity(ns->disk))
3428 blk_integrity_unregister(ns->disk);
3429 }
3430
3431 down_write(&ns->ctrl->namespaces_rwsem);
3432 list_del_init(&ns->list);
3433 up_write(&ns->ctrl->namespaces_rwsem);
3434
3435 nvme_mpath_check_last_path(ns);
3436 nvme_put_ns(ns);
3437}
3438
3439static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid)
3440{
3441 struct nvme_ns *ns;
3442
3443 ns = nvme_find_get_ns(ctrl, nsid);
3444 if (ns) {
3445 if (ns->disk && revalidate_disk(ns->disk))
3446 nvme_ns_remove(ns);
3447 nvme_put_ns(ns);
3448 } else
3449 nvme_alloc_ns(ctrl, nsid);
3450}
3451
3452static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl,
3453 unsigned nsid)
3454{
3455 struct nvme_ns *ns, *next;
3456 LIST_HEAD(rm_list);
3457
3458 down_write(&ctrl->namespaces_rwsem);
3459 list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) {
3460 if (ns->head->ns_id > nsid || test_bit(NVME_NS_DEAD, &ns->flags))
3461 list_move_tail(&ns->list, &rm_list);
3462 }
3463 up_write(&ctrl->namespaces_rwsem);
3464
3465 list_for_each_entry_safe(ns, next, &rm_list, list)
3466 nvme_ns_remove(ns);
3467
3468}
3469
3470static int nvme_scan_ns_list(struct nvme_ctrl *ctrl, unsigned nn)
3471{
3472 struct nvme_ns *ns;
3473 __le32 *ns_list;
3474 unsigned i, j, nsid, prev = 0;
3475 unsigned num_lists = DIV_ROUND_UP_ULL((u64)nn, 1024);
3476 int ret = 0;
3477
3478 ns_list = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL);
3479 if (!ns_list)
3480 return -ENOMEM;
3481
3482 for (i = 0; i < num_lists; i++) {
3483 ret = nvme_identify_ns_list(ctrl, prev, ns_list);
3484 if (ret)
3485 goto free;
3486
3487 for (j = 0; j < min(nn, 1024U); j++) {
3488 nsid = le32_to_cpu(ns_list[j]);
3489 if (!nsid)
3490 goto out;
3491
3492 nvme_validate_ns(ctrl, nsid);
3493
3494 while (++prev < nsid) {
3495 ns = nvme_find_get_ns(ctrl, prev);
3496 if (ns) {
3497 nvme_ns_remove(ns);
3498 nvme_put_ns(ns);
3499 }
3500 }
3501 }
3502 nn -= j;
3503 }
3504 out:
3505 nvme_remove_invalid_namespaces(ctrl, prev);
3506 free:
3507 kfree(ns_list);
3508 return ret;
3509}
3510
3511static void nvme_scan_ns_sequential(struct nvme_ctrl *ctrl, unsigned nn)
3512{
3513 unsigned i;
3514
3515 for (i = 1; i <= nn; i++)
3516 nvme_validate_ns(ctrl, i);
3517
3518 nvme_remove_invalid_namespaces(ctrl, nn);
3519}
3520
3521static void nvme_clear_changed_ns_log(struct nvme_ctrl *ctrl)
3522{
3523 size_t log_size = NVME_MAX_CHANGED_NAMESPACES * sizeof(__le32);
3524 __le32 *log;
3525 int error;
3526
3527 log = kzalloc(log_size, GFP_KERNEL);
3528 if (!log)
3529 return;
3530
3531
3532
3533
3534
3535
3536
3537 error = nvme_get_log(ctrl, NVME_NSID_ALL, NVME_LOG_CHANGED_NS, 0, log,
3538 log_size, 0);
3539 if (error)
3540 dev_warn(ctrl->device,
3541 "reading changed ns log failed: %d\n", error);
3542
3543 kfree(log);
3544}
3545
3546static void nvme_scan_work(struct work_struct *work)
3547{
3548 struct nvme_ctrl *ctrl =
3549 container_of(work, struct nvme_ctrl, scan_work);
3550 struct nvme_id_ctrl *id;
3551 unsigned nn;
3552
3553 if (ctrl->state != NVME_CTRL_LIVE)
3554 return;
3555
3556 WARN_ON_ONCE(!ctrl->tagset);
3557
3558 if (test_and_clear_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events)) {
3559 dev_info(ctrl->device, "rescanning namespaces.\n");
3560 nvme_clear_changed_ns_log(ctrl);
3561 }
3562
3563 if (nvme_identify_ctrl(ctrl, &id))
3564 return;
3565
3566 mutex_lock(&ctrl->scan_lock);
3567 nn = le32_to_cpu(id->nn);
3568 if (ctrl->vs >= NVME_VS(1, 1, 0) &&
3569 !(ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)) {
3570 if (!nvme_scan_ns_list(ctrl, nn))
3571 goto out_free_id;
3572 }
3573 nvme_scan_ns_sequential(ctrl, nn);
3574out_free_id:
3575 mutex_unlock(&ctrl->scan_lock);
3576 kfree(id);
3577 down_write(&ctrl->namespaces_rwsem);
3578 list_sort(NULL, &ctrl->namespaces, ns_cmp);
3579 up_write(&ctrl->namespaces_rwsem);
3580}
3581
3582
3583
3584
3585
3586
3587void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
3588{
3589 struct nvme_ns *ns, *next;
3590 LIST_HEAD(ns_list);
3591
3592
3593
3594
3595
3596
3597 nvme_mpath_clear_ctrl_paths(ctrl);
3598
3599
3600 flush_work(&ctrl->scan_work);
3601
3602
3603
3604
3605
3606
3607
3608 if (ctrl->state == NVME_CTRL_DEAD)
3609 nvme_kill_queues(ctrl);
3610
3611 down_write(&ctrl->namespaces_rwsem);
3612 list_splice_init(&ctrl->namespaces, &ns_list);
3613 up_write(&ctrl->namespaces_rwsem);
3614
3615 list_for_each_entry_safe(ns, next, &ns_list, list)
3616 nvme_ns_remove(ns);
3617}
3618EXPORT_SYMBOL_GPL(nvme_remove_namespaces);
3619
3620static void nvme_aen_uevent(struct nvme_ctrl *ctrl)
3621{
3622 char *envp[2] = { NULL, NULL };
3623 u32 aen_result = ctrl->aen_result;
3624
3625 ctrl->aen_result = 0;
3626 if (!aen_result)
3627 return;
3628
3629 envp[0] = kasprintf(GFP_KERNEL, "NVME_AEN=%#08x", aen_result);
3630 if (!envp[0])
3631 return;
3632 kobject_uevent_env(&ctrl->device->kobj, KOBJ_CHANGE, envp);
3633 kfree(envp[0]);
3634}
3635
3636static void nvme_async_event_work(struct work_struct *work)
3637{
3638 struct nvme_ctrl *ctrl =
3639 container_of(work, struct nvme_ctrl, async_event_work);
3640
3641 nvme_aen_uevent(ctrl);
3642 ctrl->ops->submit_async_event(ctrl);
3643}
3644
3645static bool nvme_ctrl_pp_status(struct nvme_ctrl *ctrl)
3646{
3647
3648 u32 csts;
3649
3650 if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts))
3651 return false;
3652
3653 if (csts == ~0)
3654 return false;
3655
3656 return ((ctrl->ctrl_config & NVME_CC_ENABLE) && (csts & NVME_CSTS_PP));
3657}
3658
3659static void nvme_get_fw_slot_info(struct nvme_ctrl *ctrl)
3660{
3661 struct nvme_fw_slot_info_log *log;
3662
3663 log = kmalloc(sizeof(*log), GFP_KERNEL);
3664 if (!log)
3665 return;
3666
3667 if (nvme_get_log(ctrl, NVME_NSID_ALL, 0, NVME_LOG_FW_SLOT, log,
3668 sizeof(*log), 0))
3669 dev_warn(ctrl->device, "Get FW SLOT INFO log error\n");
3670 kfree(log);
3671}
3672
3673static void nvme_fw_act_work(struct work_struct *work)
3674{
3675 struct nvme_ctrl *ctrl = container_of(work,
3676 struct nvme_ctrl, fw_act_work);
3677 unsigned long fw_act_timeout;
3678
3679 if (ctrl->mtfa)
3680 fw_act_timeout = jiffies +
3681 msecs_to_jiffies(ctrl->mtfa * 100);
3682 else
3683 fw_act_timeout = jiffies +
3684 msecs_to_jiffies(admin_timeout * 1000);
3685
3686 nvme_stop_queues(ctrl);
3687 while (nvme_ctrl_pp_status(ctrl)) {
3688 if (time_after(jiffies, fw_act_timeout)) {
3689 dev_warn(ctrl->device,
3690 "Fw activation timeout, reset controller\n");
3691 nvme_reset_ctrl(ctrl);
3692 break;
3693 }
3694 msleep(100);
3695 }
3696
3697 if (ctrl->state != NVME_CTRL_LIVE)
3698 return;
3699
3700 nvme_start_queues(ctrl);
3701
3702 nvme_get_fw_slot_info(ctrl);
3703}
3704
3705static void nvme_handle_aen_notice(struct nvme_ctrl *ctrl, u32 result)
3706{
3707 u32 aer_notice_type = (result & 0xff00) >> 8;
3708
3709 trace_nvme_async_event(ctrl, aer_notice_type);
3710
3711 switch (aer_notice_type) {
3712 case NVME_AER_NOTICE_NS_CHANGED:
3713 set_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events);
3714 nvme_queue_scan(ctrl);
3715 break;
3716 case NVME_AER_NOTICE_FW_ACT_STARTING:
3717 queue_work(nvme_wq, &ctrl->fw_act_work);
3718 break;
3719#ifdef CONFIG_NVME_MULTIPATH
3720 case NVME_AER_NOTICE_ANA:
3721 if (!ctrl->ana_log_buf)
3722 break;
3723 queue_work(nvme_wq, &ctrl->ana_work);
3724 break;
3725#endif
3726 default:
3727 dev_warn(ctrl->device, "async event result %08x\n", result);
3728 }
3729}
3730
3731void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
3732 volatile union nvme_result *res)
3733{
3734 u32 result = le32_to_cpu(res->u32);
3735 u32 aer_type = result & 0x07;
3736
3737 if (le16_to_cpu(status) >> 1 != NVME_SC_SUCCESS)
3738 return;
3739
3740 switch (aer_type) {
3741 case NVME_AER_NOTICE:
3742 nvme_handle_aen_notice(ctrl, result);
3743 break;
3744 case NVME_AER_ERROR:
3745 case NVME_AER_SMART:
3746 case NVME_AER_CSS:
3747 case NVME_AER_VS:
3748 trace_nvme_async_event(ctrl, aer_type);
3749 ctrl->aen_result = result;
3750 break;
3751 default:
3752 break;
3753 }
3754 queue_work(nvme_wq, &ctrl->async_event_work);
3755}
3756EXPORT_SYMBOL_GPL(nvme_complete_async_event);
3757
3758void nvme_stop_ctrl(struct nvme_ctrl *ctrl)
3759{
3760 nvme_mpath_stop(ctrl);
3761 nvme_stop_keep_alive(ctrl);
3762 flush_work(&ctrl->async_event_work);
3763 cancel_work_sync(&ctrl->fw_act_work);
3764}
3765EXPORT_SYMBOL_GPL(nvme_stop_ctrl);
3766
3767void nvme_start_ctrl(struct nvme_ctrl *ctrl)
3768{
3769 if (ctrl->kato)
3770 nvme_start_keep_alive(ctrl);
3771
3772 if (ctrl->queue_count > 1) {
3773 nvme_queue_scan(ctrl);
3774 nvme_enable_aen(ctrl);
3775 queue_work(nvme_wq, &ctrl->async_event_work);
3776 nvme_start_queues(ctrl);
3777 }
3778}
3779EXPORT_SYMBOL_GPL(nvme_start_ctrl);
3780
3781void nvme_uninit_ctrl(struct nvme_ctrl *ctrl)
3782{
3783 nvme_fault_inject_fini(&ctrl->fault_inject);
3784 dev_pm_qos_hide_latency_tolerance(ctrl->device);
3785 cdev_device_del(&ctrl->cdev, ctrl->device);
3786}
3787EXPORT_SYMBOL_GPL(nvme_uninit_ctrl);
3788
3789static void nvme_free_ctrl(struct device *dev)
3790{
3791 struct nvme_ctrl *ctrl =
3792 container_of(dev, struct nvme_ctrl, ctrl_device);
3793 struct nvme_subsystem *subsys = ctrl->subsys;
3794
3795 ida_simple_remove(&nvme_instance_ida, ctrl->instance);
3796 kfree(ctrl->effects);
3797 nvme_mpath_uninit(ctrl);
3798 __free_page(ctrl->discard_page);
3799
3800 if (subsys) {
3801 mutex_lock(&nvme_subsystems_lock);
3802 list_del(&ctrl->subsys_entry);
3803 sysfs_remove_link(&subsys->dev.kobj, dev_name(ctrl->device));
3804 mutex_unlock(&nvme_subsystems_lock);
3805 }
3806
3807 ctrl->ops->free_ctrl(ctrl);
3808
3809 if (subsys)
3810 nvme_put_subsystem(subsys);
3811}
3812
3813
3814
3815
3816
3817
3818int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
3819 const struct nvme_ctrl_ops *ops, unsigned long quirks)
3820{
3821 int ret;
3822
3823 ctrl->state = NVME_CTRL_NEW;
3824 spin_lock_init(&ctrl->lock);
3825 mutex_init(&ctrl->scan_lock);
3826 INIT_LIST_HEAD(&ctrl->namespaces);
3827 init_rwsem(&ctrl->namespaces_rwsem);
3828 ctrl->dev = dev;
3829 ctrl->ops = ops;
3830 ctrl->quirks = quirks;
3831 INIT_WORK(&ctrl->scan_work, nvme_scan_work);
3832 INIT_WORK(&ctrl->async_event_work, nvme_async_event_work);
3833 INIT_WORK(&ctrl->fw_act_work, nvme_fw_act_work);
3834 INIT_WORK(&ctrl->delete_work, nvme_delete_ctrl_work);
3835
3836 INIT_DELAYED_WORK(&ctrl->ka_work, nvme_keep_alive_work);
3837 memset(&ctrl->ka_cmd, 0, sizeof(ctrl->ka_cmd));
3838 ctrl->ka_cmd.common.opcode = nvme_admin_keep_alive;
3839
3840 BUILD_BUG_ON(NVME_DSM_MAX_RANGES * sizeof(struct nvme_dsm_range) >
3841 PAGE_SIZE);
3842 ctrl->discard_page = alloc_page(GFP_KERNEL);
3843 if (!ctrl->discard_page) {
3844 ret = -ENOMEM;
3845 goto out;
3846 }
3847
3848 ret = ida_simple_get(&nvme_instance_ida, 0, 0, GFP_KERNEL);
3849 if (ret < 0)
3850 goto out;
3851 ctrl->instance = ret;
3852
3853 device_initialize(&ctrl->ctrl_device);
3854 ctrl->device = &ctrl->ctrl_device;
3855 ctrl->device->devt = MKDEV(MAJOR(nvme_chr_devt), ctrl->instance);
3856 ctrl->device->class = nvme_class;
3857 ctrl->device->parent = ctrl->dev;
3858 ctrl->device->groups = nvme_dev_attr_groups;
3859 ctrl->device->release = nvme_free_ctrl;
3860 dev_set_drvdata(ctrl->device, ctrl);
3861 ret = dev_set_name(ctrl->device, "nvme%d", ctrl->instance);
3862 if (ret)
3863 goto out_release_instance;
3864
3865 cdev_init(&ctrl->cdev, &nvme_dev_fops);
3866 ctrl->cdev.owner = ops->module;
3867 ret = cdev_device_add(&ctrl->cdev, ctrl->device);
3868 if (ret)
3869 goto out_free_name;
3870
3871
3872
3873
3874
3875 ctrl->device->power.set_latency_tolerance = nvme_set_latency_tolerance;
3876 dev_pm_qos_update_user_latency_tolerance(ctrl->device,
3877 min(default_ps_max_latency_us, (unsigned long)S32_MAX));
3878
3879 nvme_fault_inject_init(&ctrl->fault_inject, dev_name(ctrl->device));
3880
3881 return 0;
3882out_free_name:
3883 kfree_const(ctrl->device->kobj.name);
3884out_release_instance:
3885 ida_simple_remove(&nvme_instance_ida, ctrl->instance);
3886out:
3887 if (ctrl->discard_page)
3888 __free_page(ctrl->discard_page);
3889 return ret;
3890}
3891EXPORT_SYMBOL_GPL(nvme_init_ctrl);
3892
3893
3894
3895
3896
3897
3898
3899
3900void nvme_kill_queues(struct nvme_ctrl *ctrl)
3901{
3902 struct nvme_ns *ns;
3903
3904 down_read(&ctrl->namespaces_rwsem);
3905
3906
3907 if (ctrl->admin_q && !blk_queue_dying(ctrl->admin_q))
3908 blk_mq_unquiesce_queue(ctrl->admin_q);
3909
3910 list_for_each_entry(ns, &ctrl->namespaces, list)
3911 nvme_set_queue_dying(ns);
3912
3913 up_read(&ctrl->namespaces_rwsem);
3914}
3915EXPORT_SYMBOL_GPL(nvme_kill_queues);
3916
3917void nvme_unfreeze(struct nvme_ctrl *ctrl)
3918{
3919 struct nvme_ns *ns;
3920
3921 down_read(&ctrl->namespaces_rwsem);
3922 list_for_each_entry(ns, &ctrl->namespaces, list)
3923 blk_mq_unfreeze_queue(ns->queue);
3924 up_read(&ctrl->namespaces_rwsem);
3925}
3926EXPORT_SYMBOL_GPL(nvme_unfreeze);
3927
3928void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout)
3929{
3930 struct nvme_ns *ns;
3931
3932 down_read(&ctrl->namespaces_rwsem);
3933 list_for_each_entry(ns, &ctrl->namespaces, list) {
3934 timeout = blk_mq_freeze_queue_wait_timeout(ns->queue, timeout);
3935 if (timeout <= 0)
3936 break;
3937 }
3938 up_read(&ctrl->namespaces_rwsem);
3939}
3940EXPORT_SYMBOL_GPL(nvme_wait_freeze_timeout);
3941
3942void nvme_wait_freeze(struct nvme_ctrl *ctrl)
3943{
3944 struct nvme_ns *ns;
3945
3946 down_read(&ctrl->namespaces_rwsem);
3947 list_for_each_entry(ns, &ctrl->namespaces, list)
3948 blk_mq_freeze_queue_wait(ns->queue);
3949 up_read(&ctrl->namespaces_rwsem);
3950}
3951EXPORT_SYMBOL_GPL(nvme_wait_freeze);
3952
3953void nvme_start_freeze(struct nvme_ctrl *ctrl)
3954{
3955 struct nvme_ns *ns;
3956
3957 down_read(&ctrl->namespaces_rwsem);
3958 list_for_each_entry(ns, &ctrl->namespaces, list)
3959 blk_freeze_queue_start(ns->queue);
3960 up_read(&ctrl->namespaces_rwsem);
3961}
3962EXPORT_SYMBOL_GPL(nvme_start_freeze);
3963
3964void nvme_stop_queues(struct nvme_ctrl *ctrl)
3965{
3966 struct nvme_ns *ns;
3967
3968 down_read(&ctrl->namespaces_rwsem);
3969 list_for_each_entry(ns, &ctrl->namespaces, list)
3970 blk_mq_quiesce_queue(ns->queue);
3971 up_read(&ctrl->namespaces_rwsem);
3972}
3973EXPORT_SYMBOL_GPL(nvme_stop_queues);
3974
3975void nvme_start_queues(struct nvme_ctrl *ctrl)
3976{
3977 struct nvme_ns *ns;
3978
3979 down_read(&ctrl->namespaces_rwsem);
3980 list_for_each_entry(ns, &ctrl->namespaces, list)
3981 blk_mq_unquiesce_queue(ns->queue);
3982 up_read(&ctrl->namespaces_rwsem);
3983}
3984EXPORT_SYMBOL_GPL(nvme_start_queues);
3985
3986
3987void nvme_sync_queues(struct nvme_ctrl *ctrl)
3988{
3989 struct nvme_ns *ns;
3990
3991 down_read(&ctrl->namespaces_rwsem);
3992 list_for_each_entry(ns, &ctrl->namespaces, list)
3993 blk_sync_queue(ns->queue);
3994 up_read(&ctrl->namespaces_rwsem);
3995}
3996EXPORT_SYMBOL_GPL(nvme_sync_queues);
3997
3998
3999
4000
4001static inline void _nvme_check_size(void)
4002{
4003 BUILD_BUG_ON(sizeof(struct nvme_common_command) != 64);
4004 BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64);
4005 BUILD_BUG_ON(sizeof(struct nvme_identify) != 64);
4006 BUILD_BUG_ON(sizeof(struct nvme_features) != 64);
4007 BUILD_BUG_ON(sizeof(struct nvme_download_firmware) != 64);
4008 BUILD_BUG_ON(sizeof(struct nvme_format_cmd) != 64);
4009 BUILD_BUG_ON(sizeof(struct nvme_dsm_cmd) != 64);
4010 BUILD_BUG_ON(sizeof(struct nvme_write_zeroes_cmd) != 64);
4011 BUILD_BUG_ON(sizeof(struct nvme_abort_cmd) != 64);
4012 BUILD_BUG_ON(sizeof(struct nvme_get_log_page_command) != 64);
4013 BUILD_BUG_ON(sizeof(struct nvme_command) != 64);
4014 BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != NVME_IDENTIFY_DATA_SIZE);
4015 BUILD_BUG_ON(sizeof(struct nvme_id_ns) != NVME_IDENTIFY_DATA_SIZE);
4016 BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64);
4017 BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512);
4018 BUILD_BUG_ON(sizeof(struct nvme_dbbuf) != 64);
4019 BUILD_BUG_ON(sizeof(struct nvme_directive_cmd) != 64);
4020}
4021
4022
4023static int __init nvme_core_init(void)
4024{
4025 int result = -ENOMEM;
4026
4027 _nvme_check_size();
4028
4029 nvme_wq = alloc_workqueue("nvme-wq",
4030 WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
4031 if (!nvme_wq)
4032 goto out;
4033
4034 nvme_reset_wq = alloc_workqueue("nvme-reset-wq",
4035 WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
4036 if (!nvme_reset_wq)
4037 goto destroy_wq;
4038
4039 nvme_delete_wq = alloc_workqueue("nvme-delete-wq",
4040 WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
4041 if (!nvme_delete_wq)
4042 goto destroy_reset_wq;
4043
4044 result = alloc_chrdev_region(&nvme_chr_devt, 0, NVME_MINORS, "nvme");
4045 if (result < 0)
4046 goto destroy_delete_wq;
4047
4048 nvme_class = class_create(THIS_MODULE, "nvme");
4049 if (IS_ERR(nvme_class)) {
4050 result = PTR_ERR(nvme_class);
4051 goto unregister_chrdev;
4052 }
4053
4054 nvme_subsys_class = class_create(THIS_MODULE, "nvme-subsystem");
4055 if (IS_ERR(nvme_subsys_class)) {
4056 result = PTR_ERR(nvme_subsys_class);
4057 goto destroy_class;
4058 }
4059 return 0;
4060
4061destroy_class:
4062 class_destroy(nvme_class);
4063unregister_chrdev:
4064 unregister_chrdev_region(nvme_chr_devt, NVME_MINORS);
4065destroy_delete_wq:
4066 destroy_workqueue(nvme_delete_wq);
4067destroy_reset_wq:
4068 destroy_workqueue(nvme_reset_wq);
4069destroy_wq:
4070 destroy_workqueue(nvme_wq);
4071out:
4072 return result;
4073}
4074
4075static void __exit nvme_core_exit(void)
4076{
4077 ida_destroy(&nvme_subsystems_ida);
4078 class_destroy(nvme_subsys_class);
4079 class_destroy(nvme_class);
4080 unregister_chrdev_region(nvme_chr_devt, NVME_MINORS);
4081 destroy_workqueue(nvme_delete_wq);
4082 destroy_workqueue(nvme_reset_wq);
4083 destroy_workqueue(nvme_wq);
4084}
4085
4086MODULE_LICENSE("GPL");
4087MODULE_VERSION("1.0");
4088module_init(nvme_core_init);
4089module_exit(nvme_core_exit);
4090