core.c 90.9 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
/*
 * NVM Express device driver
 * Copyright (c) 2011-2014, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#include <linux/blkdev.h>
#include <linux/blk-mq.h>
17
#include <linux/delay.h>
18
#include <linux/errno.h>
19
#include <linux/hdreg.h>
20
#include <linux/kernel.h>
21 22
#include <linux/module.h>
#include <linux/list_sort.h>
23 24
#include <linux/slab.h>
#include <linux/types.h>
25 26 27 28
#include <linux/pr.h>
#include <linux/ptrace.h>
#include <linux/nvme_ioctl.h>
#include <linux/t10-pi.h>
29
#include <linux/pm_qos.h>
30
#include <asm/unaligned.h>
31

32 33 34
#define CREATE_TRACE_POINTS
#include "trace.h"

35
#include "nvme.h"
S
Sagi Grimberg 已提交
36
#include "fabrics.h"
37

38 39
#define NVME_MINORS		(1U << MINORBITS)

40 41
unsigned int admin_timeout = 60;
module_param(admin_timeout, uint, 0644);
42
MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands");
43
EXPORT_SYMBOL_GPL(admin_timeout);
44

45 46
unsigned int nvme_io_timeout = 30;
module_param_named(io_timeout, nvme_io_timeout, uint, 0644);
47
MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O");
48
EXPORT_SYMBOL_GPL(nvme_io_timeout);
49

50
static unsigned char shutdown_timeout = 5;
51 52 53
module_param(shutdown_timeout, byte, 0644);
MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown");

54 55
static u8 nvme_max_retries = 5;
module_param_named(max_retries, nvme_max_retries, byte, 0644);
K
Keith Busch 已提交
56
MODULE_PARM_DESC(max_retries, "max number of retries a command may have");
57

58
static unsigned long default_ps_max_latency_us = 100000;
59 60 61 62
module_param(default_ps_max_latency_us, ulong, 0644);
MODULE_PARM_DESC(default_ps_max_latency_us,
		 "max power saving latency for new devices; use PM QOS to change per device");

63 64 65 66
static bool force_apst;
module_param(force_apst, bool, 0644);
MODULE_PARM_DESC(force_apst, "allow APST for newly enumerated devices even if quirked off");

67 68 69 70
static bool streams;
module_param(streams, bool, 0644);
MODULE_PARM_DESC(streams, "turn on support for Streams write directives");

71 72 73 74 75 76 77 78 79 80 81
/*
 * nvme_wq - hosts nvme related works that are not reset or delete
 * nvme_reset_wq - hosts nvme reset works
 * nvme_delete_wq - hosts nvme delete works
 *
 * nvme_wq will host works such are scan, aen handling, fw activation,
 * keep-alive error recovery, periodic reconnects etc. nvme_reset_wq
 * runs reset works which also flush works hosted on nvme_wq for
 * serialization purposes. nvme_delete_wq host controller deletion
 * works which flush reset works for serialization.
 */
82 83 84
struct workqueue_struct *nvme_wq;
EXPORT_SYMBOL_GPL(nvme_wq);

85 86 87 88 89 90
struct workqueue_struct *nvme_reset_wq;
EXPORT_SYMBOL_GPL(nvme_reset_wq);

struct workqueue_struct *nvme_delete_wq;
EXPORT_SYMBOL_GPL(nvme_delete_wq);

C
Christoph Hellwig 已提交
91 92 93
static DEFINE_IDA(nvme_subsystems_ida);
static LIST_HEAD(nvme_subsystems);
static DEFINE_MUTEX(nvme_subsystems_lock);
94

95
static DEFINE_IDA(nvme_instance_ida);
96
static dev_t nvme_chr_devt;
97
static struct class *nvme_class;
C
Christoph Hellwig 已提交
98
static struct class *nvme_subsys_class;
99

100 101
static void nvme_ns_remove(struct nvme_ns *ns);
static int nvme_revalidate_disk(struct gendisk *disk);
102

103 104 105 106
int nvme_reset_ctrl(struct nvme_ctrl *ctrl)
{
	if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING))
		return -EBUSY;
107
	if (!queue_work(nvme_reset_wq, &ctrl->reset_work))
108 109 110 111 112
		return -EBUSY;
	return 0;
}
EXPORT_SYMBOL_GPL(nvme_reset_ctrl);

S
Sagi Grimberg 已提交
113
int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl)
114 115 116 117
{
	int ret;

	ret = nvme_reset_ctrl(ctrl);
118
	if (!ret) {
119
		flush_work(&ctrl->reset_work);
120 121 122 123
		if (ctrl->state != NVME_CTRL_LIVE)
			ret = -ENETRESET;
	}

124 125
	return ret;
}
S
Sagi Grimberg 已提交
126
EXPORT_SYMBOL_GPL(nvme_reset_ctrl_sync);
127

128 129 130 131 132
static void nvme_delete_ctrl_work(struct work_struct *work)
{
	struct nvme_ctrl *ctrl =
		container_of(work, struct nvme_ctrl, delete_work);

133 134 135
	dev_info(ctrl->device,
		 "Removing ctrl: NQN \"%s\"\n", ctrl->opts->subsysnqn);

136
	flush_work(&ctrl->reset_work);
137 138
	nvme_stop_ctrl(ctrl);
	nvme_remove_namespaces(ctrl);
139
	ctrl->ops->delete_ctrl(ctrl);
140 141
	nvme_uninit_ctrl(ctrl);
	nvme_put_ctrl(ctrl);
142 143 144 145 146 147
}

int nvme_delete_ctrl(struct nvme_ctrl *ctrl)
{
	if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING))
		return -EBUSY;
148
	if (!queue_work(nvme_delete_wq, &ctrl->delete_work))
149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170
		return -EBUSY;
	return 0;
}
EXPORT_SYMBOL_GPL(nvme_delete_ctrl);

int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl)
{
	int ret = 0;

	/*
	 * Keep a reference until the work is flushed since ->delete_ctrl
	 * can free the controller.
	 */
	nvme_get_ctrl(ctrl);
	ret = nvme_delete_ctrl(ctrl);
	if (!ret)
		flush_work(&ctrl->delete_work);
	nvme_put_ctrl(ctrl);
	return ret;
}
EXPORT_SYMBOL_GPL(nvme_delete_ctrl_sync);

171 172 173 174 175
static inline bool nvme_ns_has_pi(struct nvme_ns *ns)
{
	return ns->pi_type && ns->ms == sizeof(struct t10_pi_tuple);
}

176
static blk_status_t nvme_error_status(struct request *req)
177 178 179
{
	switch (nvme_req(req)->status & 0x7ff) {
	case NVME_SC_SUCCESS:
180
		return BLK_STS_OK;
181
	case NVME_SC_CAP_EXCEEDED:
182
		return BLK_STS_NOSPC;
183 184 185
	case NVME_SC_LBA_RANGE:
		return BLK_STS_TARGET;
	case NVME_SC_BAD_ATTRIBUTES:
186
	case NVME_SC_ONCS_NOT_SUPPORTED:
187 188 189
	case NVME_SC_INVALID_OPCODE:
	case NVME_SC_INVALID_FIELD:
	case NVME_SC_INVALID_NS:
190
		return BLK_STS_NOTSUPP;
191 192 193
	case NVME_SC_WRITE_FAULT:
	case NVME_SC_READ_ERROR:
	case NVME_SC_UNWRITTEN_BLOCK:
194 195
	case NVME_SC_ACCESS_DENIED:
	case NVME_SC_READ_ONLY:
196
	case NVME_SC_COMPARE_FAILED:
197
		return BLK_STS_MEDIUM;
198 199 200 201 202 203 204
	case NVME_SC_GUARD_CHECK:
	case NVME_SC_APPTAG_CHECK:
	case NVME_SC_REFTAG_CHECK:
	case NVME_SC_INVALID_PI:
		return BLK_STS_PROTECTION;
	case NVME_SC_RESERVATION_CONFLICT:
		return BLK_STS_NEXUS;
205 206
	default:
		return BLK_STS_IOERR;
207 208 209
	}
}

210
static inline bool nvme_req_needs_retry(struct request *req)
211
{
212 213
	if (blk_noretry_request(req))
		return false;
214
	if (nvme_req(req)->status & NVME_SC_DNR)
215
		return false;
216
	if (nvme_req(req)->retries >= nvme_max_retries)
217 218
		return false;
	return true;
219 220 221 222
}

void nvme_complete_rq(struct request *req)
{
223 224
	blk_status_t status = nvme_error_status(req);

225 226
	trace_nvme_complete_rq(req);

227 228
	if (unlikely(status != BLK_STS_OK && nvme_req_needs_retry(req))) {
		if (nvme_req_needs_failover(req, status)) {
229 230 231 232 233 234 235 236 237
			nvme_failover_req(req);
			return;
		}

		if (!blk_queue_dying(req->q)) {
			nvme_req(req)->retries++;
			blk_mq_requeue_request(req, true);
			return;
		}
238
	}
239
	blk_mq_end_request(req, status);
240 241 242
}
EXPORT_SYMBOL_GPL(nvme_complete_rq);

243 244 245 246 247 248 249 250
void nvme_cancel_request(struct request *req, void *data, bool reserved)
{
	if (!blk_mq_request_started(req))
		return;

	dev_dbg_ratelimited(((struct nvme_ctrl *) data)->device,
				"Cancelling I/O %d", req->tag);

251
	nvme_req(req)->status = NVME_SC_ABORT_REQ;
252
	blk_mq_complete_request(req);
253

254 255 256
}
EXPORT_SYMBOL_GPL(nvme_cancel_request);

257 258 259
bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
		enum nvme_ctrl_state new_state)
{
260
	enum nvme_ctrl_state old_state;
261
	unsigned long flags;
262 263
	bool changed = false;

264
	spin_lock_irqsave(&ctrl->lock, flags);
265 266

	old_state = ctrl->state;
267
	switch (new_state) {
268 269
	case NVME_CTRL_ADMIN_ONLY:
		switch (old_state) {
270
		case NVME_CTRL_CONNECTING:
271 272 273 274 275 276
			changed = true;
			/* FALLTHRU */
		default:
			break;
		}
		break;
277 278
	case NVME_CTRL_LIVE:
		switch (old_state) {
279
		case NVME_CTRL_NEW:
280
		case NVME_CTRL_RESETTING:
281
		case NVME_CTRL_CONNECTING:
282 283 284 285 286 287 288 289 290
			changed = true;
			/* FALLTHRU */
		default:
			break;
		}
		break;
	case NVME_CTRL_RESETTING:
		switch (old_state) {
		case NVME_CTRL_NEW:
291
		case NVME_CTRL_LIVE:
292
		case NVME_CTRL_ADMIN_ONLY:
293 294 295 296 297 298
			changed = true;
			/* FALLTHRU */
		default:
			break;
		}
		break;
299
	case NVME_CTRL_CONNECTING:
300
		switch (old_state) {
301
		case NVME_CTRL_NEW:
302
		case NVME_CTRL_RESETTING:
303 304 305 306 307 308 309 310 311
			changed = true;
			/* FALLTHRU */
		default:
			break;
		}
		break;
	case NVME_CTRL_DELETING:
		switch (old_state) {
		case NVME_CTRL_LIVE:
312
		case NVME_CTRL_ADMIN_ONLY:
313
		case NVME_CTRL_RESETTING:
314
		case NVME_CTRL_CONNECTING:
315 316 317 318 319 320
			changed = true;
			/* FALLTHRU */
		default:
			break;
		}
		break;
321 322 323 324 325 326 327 328 329
	case NVME_CTRL_DEAD:
		switch (old_state) {
		case NVME_CTRL_DELETING:
			changed = true;
			/* FALLTHRU */
		default:
			break;
		}
		break;
330 331 332 333 334 335 336
	default:
		break;
	}

	if (changed)
		ctrl->state = new_state;

337
	spin_unlock_irqrestore(&ctrl->lock, flags);
338 339
	if (changed && ctrl->state == NVME_CTRL_LIVE)
		nvme_kick_requeue_lists(ctrl);
340 341 342 343
	return changed;
}
EXPORT_SYMBOL_GPL(nvme_change_ctrl_state);

C
Christoph Hellwig 已提交
344 345 346 347 348
static void nvme_free_ns_head(struct kref *ref)
{
	struct nvme_ns_head *head =
		container_of(ref, struct nvme_ns_head, ref);

349
	nvme_mpath_remove_disk(head);
C
Christoph Hellwig 已提交
350 351 352 353 354 355 356 357 358 359 360
	ida_simple_remove(&head->subsys->ns_ida, head->instance);
	list_del_init(&head->entry);
	cleanup_srcu_struct(&head->srcu);
	kfree(head);
}

static void nvme_put_ns_head(struct nvme_ns_head *head)
{
	kref_put(&head->ref, nvme_free_ns_head);
}

361 362 363 364
static void nvme_free_ns(struct kref *kref)
{
	struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref);

365 366
	if (ns->ndev)
		nvme_nvm_unregister(ns);
367 368

	put_disk(ns->disk);
C
Christoph Hellwig 已提交
369
	nvme_put_ns_head(ns->head);
370
	nvme_put_ctrl(ns->ctrl);
371 372 373
	kfree(ns);
}

374
static void nvme_put_ns(struct nvme_ns *ns)
375 376 377 378
{
	kref_put(&ns->kref, nvme_free_ns);
}

379
struct request *nvme_alloc_request(struct request_queue *q,
380
		struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid)
381
{
382
	unsigned op = nvme_is_write(cmd) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN;
383 384
	struct request *req;

385
	if (qid == NVME_QID_ANY) {
386
		req = blk_mq_alloc_request(q, op, flags);
387
	} else {
388
		req = blk_mq_alloc_request_hctx(q, op, flags,
389 390
				qid ? qid - 1 : 0);
	}
391
	if (IS_ERR(req))
392
		return req;
393 394

	req->cmd_flags |= REQ_FAILFAST_DRIVER;
395
	nvme_req(req)->cmd = cmd;
396

397 398
	return req;
}
399
EXPORT_SYMBOL_GPL(nvme_alloc_request);
400

401 402 403 404 405 406 407
static int nvme_toggle_streams(struct nvme_ctrl *ctrl, bool enable)
{
	struct nvme_command c;

	memset(&c, 0, sizeof(c));

	c.directive.opcode = nvme_admin_directive_send;
A
Arnav Dawn 已提交
408
	c.directive.nsid = cpu_to_le32(NVME_NSID_ALL);
409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436
	c.directive.doper = NVME_DIR_SND_ID_OP_ENABLE;
	c.directive.dtype = NVME_DIR_IDENTIFY;
	c.directive.tdtype = NVME_DIR_STREAMS;
	c.directive.endir = enable ? NVME_DIR_ENDIR : 0;

	return nvme_submit_sync_cmd(ctrl->admin_q, &c, NULL, 0);
}

static int nvme_disable_streams(struct nvme_ctrl *ctrl)
{
	return nvme_toggle_streams(ctrl, false);
}

static int nvme_enable_streams(struct nvme_ctrl *ctrl)
{
	return nvme_toggle_streams(ctrl, true);
}

static int nvme_get_stream_params(struct nvme_ctrl *ctrl,
				  struct streams_directive_params *s, u32 nsid)
{
	struct nvme_command c;

	memset(&c, 0, sizeof(c));
	memset(s, 0, sizeof(*s));

	c.directive.opcode = nvme_admin_directive_recv;
	c.directive.nsid = cpu_to_le32(nsid);
437
	c.directive.numd = cpu_to_le32((sizeof(*s) >> 2) - 1);
438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457
	c.directive.doper = NVME_DIR_RCV_ST_OP_PARAM;
	c.directive.dtype = NVME_DIR_STREAMS;

	return nvme_submit_sync_cmd(ctrl->admin_q, &c, s, sizeof(*s));
}

static int nvme_configure_directives(struct nvme_ctrl *ctrl)
{
	struct streams_directive_params s;
	int ret;

	if (!(ctrl->oacs & NVME_CTRL_OACS_DIRECTIVES))
		return 0;
	if (!streams)
		return 0;

	ret = nvme_enable_streams(ctrl);
	if (ret)
		return ret;

A
Arnav Dawn 已提交
458
	ret = nvme_get_stream_params(ctrl, &s, NVME_NSID_ALL);
459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499
	if (ret)
		return ret;

	ctrl->nssa = le16_to_cpu(s.nssa);
	if (ctrl->nssa < BLK_MAX_WRITE_HINTS - 1) {
		dev_info(ctrl->device, "too few streams (%u) available\n",
					ctrl->nssa);
		nvme_disable_streams(ctrl);
		return 0;
	}

	ctrl->nr_streams = min_t(unsigned, ctrl->nssa, BLK_MAX_WRITE_HINTS - 1);
	dev_info(ctrl->device, "Using %u streams\n", ctrl->nr_streams);
	return 0;
}

/*
 * Check if 'req' has a write hint associated with it. If it does, assign
 * a valid namespace stream to the write.
 */
static void nvme_assign_write_stream(struct nvme_ctrl *ctrl,
				     struct request *req, u16 *control,
				     u32 *dsmgmt)
{
	enum rw_hint streamid = req->write_hint;

	if (streamid == WRITE_LIFE_NOT_SET || streamid == WRITE_LIFE_NONE)
		streamid = 0;
	else {
		streamid--;
		if (WARN_ON_ONCE(streamid > ctrl->nr_streams))
			return;

		*control |= NVME_RW_DTYPE_STREAMS;
		*dsmgmt |= streamid << 16;
	}

	if (streamid < ARRAY_SIZE(req->q->write_hints))
		req->q->write_hints[streamid] += blk_rq_bytes(req) >> 9;
}

M
Ming Lin 已提交
500 501 502 503 504
static inline void nvme_setup_flush(struct nvme_ns *ns,
		struct nvme_command *cmnd)
{
	memset(cmnd, 0, sizeof(*cmnd));
	cmnd->common.opcode = nvme_cmd_flush;
C
Christoph Hellwig 已提交
505
	cmnd->common.nsid = cpu_to_le32(ns->head->ns_id);
M
Ming Lin 已提交
506 507
}

508
static blk_status_t nvme_setup_discard(struct nvme_ns *ns, struct request *req,
M
Ming Lin 已提交
509 510
		struct nvme_command *cmnd)
{
511
	unsigned short segments = blk_rq_nr_discard_segments(req), n = 0;
M
Ming Lin 已提交
512
	struct nvme_dsm_range *range;
513
	struct bio *bio;
M
Ming Lin 已提交
514

515
	range = kmalloc_array(segments, sizeof(*range), GFP_ATOMIC);
M
Ming Lin 已提交
516
	if (!range)
517
		return BLK_STS_RESOURCE;
M
Ming Lin 已提交
518

519 520 521 522
	__rq_for_each_bio(bio, req) {
		u64 slba = nvme_block_nr(ns, bio->bi_iter.bi_sector);
		u32 nlb = bio->bi_iter.bi_size >> ns->lba_shift;

K
Keith Busch 已提交
523 524 525 526 527
		if (n < segments) {
			range[n].cattr = cpu_to_le32(0);
			range[n].nlb = cpu_to_le32(nlb);
			range[n].slba = cpu_to_le64(slba);
		}
528 529 530 531 532
		n++;
	}

	if (WARN_ON_ONCE(n != segments)) {
		kfree(range);
533
		return BLK_STS_IOERR;
534
	}
M
Ming Lin 已提交
535 536 537

	memset(cmnd, 0, sizeof(*cmnd));
	cmnd->dsm.opcode = nvme_cmd_dsm;
C
Christoph Hellwig 已提交
538
	cmnd->dsm.nsid = cpu_to_le32(ns->head->ns_id);
539
	cmnd->dsm.nr = cpu_to_le32(segments - 1);
M
Ming Lin 已提交
540 541
	cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);

542 543
	req->special_vec.bv_page = virt_to_page(range);
	req->special_vec.bv_offset = offset_in_page(range);
544
	req->special_vec.bv_len = sizeof(*range) * segments;
545
	req->rq_flags |= RQF_SPECIAL_PAYLOAD;
M
Ming Lin 已提交
546

547
	return BLK_STS_OK;
M
Ming Lin 已提交
548 549
}

550 551
static inline blk_status_t nvme_setup_rw(struct nvme_ns *ns,
		struct request *req, struct nvme_command *cmnd)
M
Ming Lin 已提交
552
{
553
	struct nvme_ctrl *ctrl = ns->ctrl;
M
Ming Lin 已提交
554 555 556 557 558 559 560 561 562 563 564 565 566
	u16 control = 0;
	u32 dsmgmt = 0;

	if (req->cmd_flags & REQ_FUA)
		control |= NVME_RW_FUA;
	if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD))
		control |= NVME_RW_LR;

	if (req->cmd_flags & REQ_RAHEAD)
		dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;

	memset(cmnd, 0, sizeof(*cmnd));
	cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read);
C
Christoph Hellwig 已提交
567
	cmnd->rw.nsid = cpu_to_le32(ns->head->ns_id);
M
Ming Lin 已提交
568 569 570
	cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
	cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);

571 572 573
	if (req_op(req) == REQ_OP_WRITE && ctrl->nr_streams)
		nvme_assign_write_stream(ctrl, req, &control, &dsmgmt);

M
Ming Lin 已提交
574
	if (ns->ms) {
575 576 577 578 579 580 581 582 583 584 585 586
		/*
		 * If formated with metadata, the block layer always provides a
		 * metadata buffer if CONFIG_BLK_DEV_INTEGRITY is enabled.  Else
		 * we enable the PRACT bit for protection information or set the
		 * namespace capacity to zero to prevent any I/O.
		 */
		if (!blk_integrity_rq(req)) {
			if (WARN_ON_ONCE(!nvme_ns_has_pi(ns)))
				return BLK_STS_NOTSUPP;
			control |= NVME_RW_PRINFO_PRACT;
		}

M
Ming Lin 已提交
587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602
		switch (ns->pi_type) {
		case NVME_NS_DPS_PI_TYPE3:
			control |= NVME_RW_PRINFO_PRCHK_GUARD;
			break;
		case NVME_NS_DPS_PI_TYPE1:
		case NVME_NS_DPS_PI_TYPE2:
			control |= NVME_RW_PRINFO_PRCHK_GUARD |
					NVME_RW_PRINFO_PRCHK_REF;
			cmnd->rw.reftag = cpu_to_le32(
					nvme_block_nr(ns, blk_rq_pos(req)));
			break;
		}
	}

	cmnd->rw.control = cpu_to_le16(control);
	cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
603
	return 0;
M
Ming Lin 已提交
604 605
}

606
blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
M
Ming Lin 已提交
607 608
		struct nvme_command *cmd)
{
609
	blk_status_t ret = BLK_STS_OK;
M
Ming Lin 已提交
610

611
	if (!(req->rq_flags & RQF_DONTPREP)) {
612
		nvme_req(req)->retries = 0;
613
		nvme_req(req)->flags = 0;
614 615 616
		req->rq_flags |= RQF_DONTPREP;
	}

617 618 619
	switch (req_op(req)) {
	case REQ_OP_DRV_IN:
	case REQ_OP_DRV_OUT:
620
		memcpy(cmd, nvme_req(req)->cmd, sizeof(*cmd));
621 622
		break;
	case REQ_OP_FLUSH:
M
Ming Lin 已提交
623
		nvme_setup_flush(ns, cmd);
624
		break;
625 626
	case REQ_OP_WRITE_ZEROES:
		/* currently only aliased to deallocate for a few ctrls: */
627
	case REQ_OP_DISCARD:
M
Ming Lin 已提交
628
		ret = nvme_setup_discard(ns, req, cmd);
629 630 631
		break;
	case REQ_OP_READ:
	case REQ_OP_WRITE:
632
		ret = nvme_setup_rw(ns, req, cmd);
633 634 635
		break;
	default:
		WARN_ON_ONCE(1);
636
		return BLK_STS_IOERR;
637
	}
M
Ming Lin 已提交
638

639
	cmd->common.command_id = req->tag;
640 641 642 643
	if (ns)
		trace_nvme_setup_nvm_cmd(req->q->id, cmd);
	else
		trace_nvme_setup_admin_cmd(cmd);
M
Ming Lin 已提交
644 645 646 647
	return ret;
}
EXPORT_SYMBOL_GPL(nvme_setup_cmd);

648 649 650 651 652
/*
 * Returns 0 on success.  If the result is negative, it's a Linux error code;
 * if the result is positive, it's an NVM Express status code
 */
int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
653
		union nvme_result *result, void *buffer, unsigned bufflen,
654 655
		unsigned timeout, int qid, int at_head,
		blk_mq_req_flags_t flags)
656 657 658 659
{
	struct request *req;
	int ret;

660
	req = nvme_alloc_request(q, cmd, flags, qid);
661 662 663 664 665
	if (IS_ERR(req))
		return PTR_ERR(req);

	req->timeout = timeout ? timeout : ADMIN_TIMEOUT;

666 667 668 669
	if (buffer && bufflen) {
		ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL);
		if (ret)
			goto out;
670 671
	}

672
	blk_execute_rq(req->q, NULL, req, at_head);
673 674
	if (result)
		*result = nvme_req(req)->result;
675 676 677 678
	if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
		ret = -EINTR;
	else
		ret = nvme_req(req)->status;
679 680 681 682
 out:
	blk_mq_free_request(req);
	return ret;
}
683
EXPORT_SYMBOL_GPL(__nvme_submit_sync_cmd);
684 685 686 687

int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
		void *buffer, unsigned bufflen)
{
688 689
	return __nvme_submit_sync_cmd(q, cmd, NULL, buffer, bufflen, 0,
			NVME_QID_ANY, 0, 0);
690
}
691
EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd);
692

693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726
static void *nvme_add_user_metadata(struct bio *bio, void __user *ubuf,
		unsigned len, u32 seed, bool write)
{
	struct bio_integrity_payload *bip;
	int ret = -ENOMEM;
	void *buf;

	buf = kmalloc(len, GFP_KERNEL);
	if (!buf)
		goto out;

	ret = -EFAULT;
	if (write && copy_from_user(buf, ubuf, len))
		goto out_free_meta;

	bip = bio_integrity_alloc(bio, GFP_KERNEL, 1);
	if (IS_ERR(bip)) {
		ret = PTR_ERR(bip);
		goto out_free_meta;
	}

	bip->bip_iter.bi_size = len;
	bip->bip_iter.bi_sector = seed;
	ret = bio_integrity_add_page(bio, virt_to_page(buf), len,
			offset_in_page(buf));
	if (ret == len)
		return buf;
	ret = -ENOMEM;
out_free_meta:
	kfree(buf);
out:
	return ERR_PTR(ret);
}

727
static int nvme_submit_user_cmd(struct request_queue *q,
728 729 730
		struct nvme_command *cmd, void __user *ubuffer,
		unsigned bufflen, void __user *meta_buffer, unsigned meta_len,
		u32 meta_seed, u32 *result, unsigned timeout)
731
{
732
	bool write = nvme_is_write(cmd);
733 734
	struct nvme_ns *ns = q->queuedata;
	struct gendisk *disk = ns ? ns->disk : NULL;
735
	struct request *req;
736 737
	struct bio *bio = NULL;
	void *meta = NULL;
738 739
	int ret;

740
	req = nvme_alloc_request(q, cmd, 0, NVME_QID_ANY);
741 742 743 744 745 746
	if (IS_ERR(req))
		return PTR_ERR(req);

	req->timeout = timeout ? timeout : ADMIN_TIMEOUT;

	if (ubuffer && bufflen) {
747 748 749 750 751
		ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
				GFP_KERNEL);
		if (ret)
			goto out;
		bio = req->bio;
752
		bio->bi_disk = disk;
753 754 755 756 757
		if (disk && meta_buffer && meta_len) {
			meta = nvme_add_user_metadata(bio, meta_buffer, meta_len,
					meta_seed, write);
			if (IS_ERR(meta)) {
				ret = PTR_ERR(meta);
758 759 760 761
				goto out_unmap;
			}
		}
	}
762

763
	blk_execute_rq(req->q, disk, req, 0);
764 765 766 767
	if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
		ret = -EINTR;
	else
		ret = nvme_req(req)->status;
768
	if (result)
769
		*result = le32_to_cpu(nvme_req(req)->result.u32);
770 771 772 773 774 775
	if (meta && !ret && !write) {
		if (copy_to_user(meta_buffer, meta, meta_len))
			ret = -EFAULT;
	}
	kfree(meta);
 out_unmap:
776
	if (bio)
777
		blk_rq_unmap_user(bio);
778 779 780 781 782
 out:
	blk_mq_free_request(req);
	return ret;
}

783
static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status)
S
Sagi Grimberg 已提交
784 785 786 787 788
{
	struct nvme_ctrl *ctrl = rq->end_io_data;

	blk_mq_free_request(rq);

789
	if (status) {
S
Sagi Grimberg 已提交
790
		dev_err(ctrl->device,
791 792
			"failed nvme_keep_alive_end_io error=%d\n",
				status);
S
Sagi Grimberg 已提交
793 794 795 796 797 798 799 800 801 802
		return;
	}

	schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
}

static int nvme_keep_alive(struct nvme_ctrl *ctrl)
{
	struct request *rq;

803
	rq = nvme_alloc_request(ctrl->admin_q, &ctrl->ka_cmd, BLK_MQ_REQ_RESERVED,
S
Sagi Grimberg 已提交
804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823
			NVME_QID_ANY);
	if (IS_ERR(rq))
		return PTR_ERR(rq);

	rq->timeout = ctrl->kato * HZ;
	rq->end_io_data = ctrl;

	blk_execute_rq_nowait(rq->q, NULL, rq, 0, nvme_keep_alive_end_io);

	return 0;
}

static void nvme_keep_alive_work(struct work_struct *work)
{
	struct nvme_ctrl *ctrl = container_of(to_delayed_work(work),
			struct nvme_ctrl, ka_work);

	if (nvme_keep_alive(ctrl)) {
		/* allocation failure, reset the controller */
		dev_err(ctrl->device, "keep-alive failed\n");
824
		nvme_reset_ctrl(ctrl);
S
Sagi Grimberg 已提交
825 826 827 828 829 830 831 832 833 834
		return;
	}
}

void nvme_start_keep_alive(struct nvme_ctrl *ctrl)
{
	if (unlikely(ctrl->kato == 0))
		return;

	INIT_DELAYED_WORK(&ctrl->ka_work, nvme_keep_alive_work);
835 836
	memset(&ctrl->ka_cmd, 0, sizeof(ctrl->ka_cmd));
	ctrl->ka_cmd.common.opcode = nvme_admin_keep_alive;
S
Sagi Grimberg 已提交
837 838 839 840 841 842 843 844 845 846 847 848 849
	schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
}
EXPORT_SYMBOL_GPL(nvme_start_keep_alive);

void nvme_stop_keep_alive(struct nvme_ctrl *ctrl)
{
	if (unlikely(ctrl->kato == 0))
		return;

	cancel_delayed_work_sync(&ctrl->ka_work);
}
EXPORT_SYMBOL_GPL(nvme_stop_keep_alive);

K
Keith Busch 已提交
850
static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
851 852 853 854 855 856
{
	struct nvme_command c = { };
	int error;

	/* gcc-4.4.4 (at least) has issues with initializers and anon unions */
	c.identify.opcode = nvme_admin_identify;
857
	c.identify.cns = NVME_ID_CNS_CTRL;
858 859 860 861 862 863 864 865 866 867 868 869

	*id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL);
	if (!*id)
		return -ENOMEM;

	error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
			sizeof(struct nvme_id_ctrl));
	if (error)
		kfree(*id);
	return error;
}

870
static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
871
		struct nvme_ns_ids *ids)
872 873 874 875 876 877 878 879 880 881 882 883 884 885 886
{
	struct nvme_command c = { };
	int status;
	void *data;
	int pos;
	int len;

	c.identify.opcode = nvme_admin_identify;
	c.identify.nsid = cpu_to_le32(nsid);
	c.identify.cns = NVME_ID_CNS_NS_DESC_LIST;

	data = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL);
	if (!data)
		return -ENOMEM;

887
	status = nvme_submit_sync_cmd(ctrl->admin_q, &c, data,
888 889 890 891 892 893 894 895 896 897 898 899 900
				      NVME_IDENTIFY_DATA_SIZE);
	if (status)
		goto free_data;

	for (pos = 0; pos < NVME_IDENTIFY_DATA_SIZE; pos += len) {
		struct nvme_ns_id_desc *cur = data + pos;

		if (cur->nidl == 0)
			break;

		switch (cur->nidt) {
		case NVME_NIDT_EUI64:
			if (cur->nidl != NVME_NIDT_EUI64_LEN) {
901
				dev_warn(ctrl->device,
902 903 904 905 906
					 "ctrl returned bogus length: %d for NVME_NIDT_EUI64\n",
					 cur->nidl);
				goto free_data;
			}
			len = NVME_NIDT_EUI64_LEN;
907
			memcpy(ids->eui64, data + pos + sizeof(*cur), len);
908 909 910
			break;
		case NVME_NIDT_NGUID:
			if (cur->nidl != NVME_NIDT_NGUID_LEN) {
911
				dev_warn(ctrl->device,
912 913 914 915 916
					 "ctrl returned bogus length: %d for NVME_NIDT_NGUID\n",
					 cur->nidl);
				goto free_data;
			}
			len = NVME_NIDT_NGUID_LEN;
917
			memcpy(ids->nguid, data + pos + sizeof(*cur), len);
918 919 920
			break;
		case NVME_NIDT_UUID:
			if (cur->nidl != NVME_NIDT_UUID_LEN) {
921
				dev_warn(ctrl->device,
922 923 924 925 926
					 "ctrl returned bogus length: %d for NVME_NIDT_UUID\n",
					 cur->nidl);
				goto free_data;
			}
			len = NVME_NIDT_UUID_LEN;
927
			uuid_copy(&ids->uuid, data + pos + sizeof(*cur));
928 929 930 931 932 933 934 935 936 937 938 939 940 941
			break;
		default:
			/* Skip unnkown types */
			len = cur->nidl;
			break;
		}

		len += sizeof(*cur);
	}
free_data:
	kfree(data);
	return status;
}

942 943 944 945 946
static int nvme_identify_ns_list(struct nvme_ctrl *dev, unsigned nsid, __le32 *ns_list)
{
	struct nvme_command c = { };

	c.identify.opcode = nvme_admin_identify;
947
	c.identify.cns = NVME_ID_CNS_NS_ACTIVE_LIST;
948
	c.identify.nsid = cpu_to_le32(nsid);
949 950
	return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list,
				    NVME_IDENTIFY_DATA_SIZE);
951 952
}

953 954
static struct nvme_id_ns *nvme_identify_ns(struct nvme_ctrl *ctrl,
		unsigned nsid)
955
{
956
	struct nvme_id_ns *id;
957 958 959 960
	struct nvme_command c = { };
	int error;

	/* gcc-4.4.4 (at least) has issues with initializers and anon unions */
961 962
	c.identify.opcode = nvme_admin_identify;
	c.identify.nsid = cpu_to_le32(nsid);
963
	c.identify.cns = NVME_ID_CNS_NS;
964

965 966 967
	id = kmalloc(sizeof(*id), GFP_KERNEL);
	if (!id)
		return NULL;
968

969 970 971 972 973 974 975 976
	error = nvme_submit_sync_cmd(ctrl->admin_q, &c, id, sizeof(*id));
	if (error) {
		dev_warn(ctrl->device, "Identify namespace failed\n");
		kfree(id);
		return NULL;
	}

	return id;
977 978
}

K
Keith Busch 已提交
979
static int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
980
		      void *buffer, size_t buflen, u32 *result)
981 982
{
	struct nvme_command c;
983
	union nvme_result res;
984
	int ret;
985 986 987 988 989 990

	memset(&c, 0, sizeof(c));
	c.features.opcode = nvme_admin_set_features;
	c.features.fid = cpu_to_le32(fid);
	c.features.dword11 = cpu_to_le32(dword11);

991
	ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &res,
992
			buffer, buflen, 0, NVME_QID_ANY, 0, 0);
993
	if (ret >= 0 && result)
994
		*result = le32_to_cpu(res.u32);
995
	return ret;
996 997
}

C
Christoph Hellwig 已提交
998 999 1000 1001 1002 1003
int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count)
{
	u32 q_count = (*count - 1) | ((*count - 1) << 16);
	u32 result;
	int status, nr_io_queues;

1004
	status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, NULL, 0,
C
Christoph Hellwig 已提交
1005
			&result);
1006
	if (status < 0)
C
Christoph Hellwig 已提交
1007 1008
		return status;

1009 1010 1011 1012 1013 1014
	/*
	 * Degraded controllers might return an error when setting the queue
	 * count.  We still want to be able to bring them online and offer
	 * access to the admin queue, as that might be only way to fix them up.
	 */
	if (status > 0) {
1015
		dev_err(ctrl->device, "Could not set queue count (%d)\n", status);
1016 1017 1018 1019 1020 1021
		*count = 0;
	} else {
		nr_io_queues = min(result & 0xffff, result >> 16) + 1;
		*count = min(*count, nr_io_queues);
	}

C
Christoph Hellwig 已提交
1022 1023
	return 0;
}
1024
EXPORT_SYMBOL_GPL(nvme_set_queue_count);
C
Christoph Hellwig 已提交
1025

1026 1027 1028 1029 1030 1031 1032 1033 1034
static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
{
	struct nvme_user_io io;
	struct nvme_command c;
	unsigned length, meta_len;
	void __user *metadata;

	if (copy_from_user(&io, uio, sizeof(io)))
		return -EFAULT;
1035 1036
	if (io.flags)
		return -EINVAL;
1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061

	switch (io.opcode) {
	case nvme_cmd_write:
	case nvme_cmd_read:
	case nvme_cmd_compare:
		break;
	default:
		return -EINVAL;
	}

	length = (io.nblocks + 1) << ns->lba_shift;
	meta_len = (io.nblocks + 1) * ns->ms;
	metadata = (void __user *)(uintptr_t)io.metadata;

	if (ns->ext) {
		length += meta_len;
		meta_len = 0;
	} else if (meta_len) {
		if ((io.metadata & 3) || !io.metadata)
			return -EINVAL;
	}

	memset(&c, 0, sizeof(c));
	c.rw.opcode = io.opcode;
	c.rw.flags = io.flags;
C
Christoph Hellwig 已提交
1062
	c.rw.nsid = cpu_to_le32(ns->head->ns_id);
1063 1064 1065 1066 1067 1068 1069 1070
	c.rw.slba = cpu_to_le64(io.slba);
	c.rw.length = cpu_to_le16(io.nblocks);
	c.rw.control = cpu_to_le16(io.control);
	c.rw.dsmgmt = cpu_to_le32(io.dsmgmt);
	c.rw.reftag = cpu_to_le32(io.reftag);
	c.rw.apptag = cpu_to_le16(io.apptag);
	c.rw.appmask = cpu_to_le16(io.appmask);

1071
	return nvme_submit_user_cmd(ns->queue, &c,
1072 1073 1074 1075
			(void __user *)(uintptr_t)io.addr, length,
			metadata, meta_len, io.slba, NULL, 0);
}

1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122
static u32 nvme_known_admin_effects(u8 opcode)
{
	switch (opcode) {
	case nvme_admin_format_nvm:
		return NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC |
					NVME_CMD_EFFECTS_CSE_MASK;
	case nvme_admin_sanitize_nvm:
		return NVME_CMD_EFFECTS_CSE_MASK;
	default:
		break;
	}
	return 0;
}

static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
								u8 opcode)
{
	u32 effects = 0;

	if (ns) {
		if (ctrl->effects)
			effects = le32_to_cpu(ctrl->effects->iocs[opcode]);
		if (effects & ~NVME_CMD_EFFECTS_CSUPP)
			dev_warn(ctrl->device,
				 "IO command:%02x has unhandled effects:%08x\n",
				 opcode, effects);
		return 0;
	}

	if (ctrl->effects)
		effects = le32_to_cpu(ctrl->effects->iocs[opcode]);
	else
		effects = nvme_known_admin_effects(opcode);

	/*
	 * For simplicity, IO to all namespaces is quiesced even if the command
	 * effects say only one namespace is affected.
	 */
	if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) {
		nvme_start_freeze(ctrl);
		nvme_wait_freeze(ctrl);
	}
	return effects;
}

static void nvme_update_formats(struct nvme_ctrl *ctrl)
{
1123 1124
	struct nvme_ns *ns, *next;
	LIST_HEAD(rm_list);
1125

1126
	down_write(&ctrl->namespaces_rwsem);
1127
	list_for_each_entry(ns, &ctrl->namespaces, list) {
1128 1129 1130
		if (ns->disk && nvme_revalidate_disk(ns->disk)) {
			list_move_tail(&ns->list, &rm_list);
		}
1131
	}
1132
	up_write(&ctrl->namespaces_rwsem);
1133 1134 1135

	list_for_each_entry_safe(ns, next, &rm_list, list)
		nvme_ns_remove(ns);
1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154
}

static void nvme_passthru_end(struct nvme_ctrl *ctrl, u32 effects)
{
	/*
	 * Revalidate LBA changes prior to unfreezing. This is necessary to
	 * prevent memory corruption if a logical block size was changed by
	 * this command.
	 */
	if (effects & NVME_CMD_EFFECTS_LBCC)
		nvme_update_formats(ctrl);
	if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK))
		nvme_unfreeze(ctrl);
	if (effects & NVME_CMD_EFFECTS_CCC)
		nvme_init_identify(ctrl);
	if (effects & (NVME_CMD_EFFECTS_NIC | NVME_CMD_EFFECTS_NCC))
		nvme_queue_scan(ctrl);
}

1155
static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
1156 1157 1158 1159 1160
			struct nvme_passthru_cmd __user *ucmd)
{
	struct nvme_passthru_cmd cmd;
	struct nvme_command c;
	unsigned timeout = 0;
1161
	u32 effects;
1162 1163 1164 1165 1166 1167
	int status;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
		return -EFAULT;
1168 1169
	if (cmd.flags)
		return -EINVAL;
1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186

	memset(&c, 0, sizeof(c));
	c.common.opcode = cmd.opcode;
	c.common.flags = cmd.flags;
	c.common.nsid = cpu_to_le32(cmd.nsid);
	c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
	c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
	c.common.cdw10[0] = cpu_to_le32(cmd.cdw10);
	c.common.cdw10[1] = cpu_to_le32(cmd.cdw11);
	c.common.cdw10[2] = cpu_to_le32(cmd.cdw12);
	c.common.cdw10[3] = cpu_to_le32(cmd.cdw13);
	c.common.cdw10[4] = cpu_to_le32(cmd.cdw14);
	c.common.cdw10[5] = cpu_to_le32(cmd.cdw15);

	if (cmd.timeout_ms)
		timeout = msecs_to_jiffies(cmd.timeout_ms);

1187
	effects = nvme_passthru_start(ctrl, ns, cmd.opcode);
1188
	status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
1189
			(void __user *)(uintptr_t)cmd.addr, cmd.data_len,
1190 1191
			(void __user *)(uintptr_t)cmd.metadata, cmd.metadata,
			0, &cmd.result, timeout);
1192 1193
	nvme_passthru_end(ctrl, effects);

1194 1195 1196 1197 1198 1199 1200 1201
	if (status >= 0) {
		if (put_user(cmd.result, &ucmd->result))
			return -EFAULT;
	}

	return status;
}

1202 1203 1204 1205 1206 1207
/*
 * Issue ioctl requests on the first available path.  Note that unlike normal
 * block layer requests we will not retry failed request on another controller.
 */
static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk,
		struct nvme_ns_head **head, int *srcu_idx)
1208
{
1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219
#ifdef CONFIG_NVME_MULTIPATH
	if (disk->fops == &nvme_ns_head_ops) {
		*head = disk->private_data;
		*srcu_idx = srcu_read_lock(&(*head)->srcu);
		return nvme_find_path(*head);
	}
#endif
	*head = NULL;
	*srcu_idx = -1;
	return disk->private_data;
}
1220

1221 1222 1223 1224 1225
static void nvme_put_ns_from_disk(struct nvme_ns_head *head, int idx)
{
	if (head)
		srcu_read_unlock(&head->srcu, idx);
}
1226

1227 1228
static int nvme_ns_ioctl(struct nvme_ns *ns, unsigned cmd, unsigned long arg)
{
1229 1230 1231
	switch (cmd) {
	case NVME_IOCTL_ID:
		force_successful_syscall_return();
C
Christoph Hellwig 已提交
1232
		return ns->head->ns_id;
1233 1234 1235 1236 1237 1238 1239
	case NVME_IOCTL_ADMIN_CMD:
		return nvme_user_cmd(ns->ctrl, NULL, (void __user *)arg);
	case NVME_IOCTL_IO_CMD:
		return nvme_user_cmd(ns->ctrl, ns, (void __user *)arg);
	case NVME_IOCTL_SUBMIT_IO:
		return nvme_submit_io(ns, (void __user *)arg);
	default:
1240 1241 1242 1243
#ifdef CONFIG_NVM
		if (ns->ndev)
			return nvme_nvm_ioctl(ns, cmd, arg);
#endif
1244
		if (is_sed_ioctl(cmd))
1245
			return sed_ioctl(ns->ctrl->opal_dev, cmd,
1246
					 (void __user *) arg);
1247 1248 1249 1250
		return -ENOTTY;
	}
}

1251 1252
static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
		unsigned int cmd, unsigned long arg)
1253
{
1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264
	struct nvme_ns_head *head = NULL;
	struct nvme_ns *ns;
	int srcu_idx, ret;

	ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx);
	if (unlikely(!ns))
		ret = -EWOULDBLOCK;
	else
		ret = nvme_ns_ioctl(ns, cmd, arg);
	nvme_put_ns_from_disk(head, srcu_idx);
	return ret;
1265 1266 1267 1268
}

static int nvme_open(struct block_device *bdev, fmode_t mode)
{
C
Christoph Hellwig 已提交
1269 1270
	struct nvme_ns *ns = bdev->bd_disk->private_data;

1271 1272 1273
#ifdef CONFIG_NVME_MULTIPATH
	/* should never be called due to GENHD_FL_HIDDEN */
	if (WARN_ON_ONCE(ns->head->disk))
1274
		goto fail;
1275
#endif
C
Christoph Hellwig 已提交
1276
	if (!kref_get_unless_zero(&ns->kref))
1277 1278 1279 1280
		goto fail;
	if (!try_module_get(ns->ctrl->ops->module))
		goto fail_put_ns;

C
Christoph Hellwig 已提交
1281
	return 0;
1282 1283 1284 1285 1286

fail_put_ns:
	nvme_put_ns(ns);
fail:
	return -ENXIO;
1287 1288 1289 1290
}

static void nvme_release(struct gendisk *disk, fmode_t mode)
{
1291 1292 1293 1294
	struct nvme_ns *ns = disk->private_data;

	module_put(ns->ctrl->ops->module);
	nvme_put_ns(ns);
1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306
}

static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
	/* some standard values */
	geo->heads = 1 << 6;
	geo->sectors = 1 << 5;
	geo->cylinders = get_capacity(bdev->bd_disk) >> 11;
	return 0;
}

#ifdef CONFIG_BLK_DEV_INTEGRITY
1307
static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type)
1308 1309 1310
{
	struct blk_integrity integrity;

1311
	memset(&integrity, 0, sizeof(integrity));
1312
	switch (pi_type) {
1313 1314
	case NVME_NS_DPS_PI_TYPE3:
		integrity.profile = &t10_pi_type3_crc;
1315 1316
		integrity.tag_size = sizeof(u16) + sizeof(u32);
		integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
1317 1318 1319 1320
		break;
	case NVME_NS_DPS_PI_TYPE1:
	case NVME_NS_DPS_PI_TYPE2:
		integrity.profile = &t10_pi_type1_crc;
1321 1322
		integrity.tag_size = sizeof(u16);
		integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
1323 1324 1325 1326 1327
		break;
	default:
		integrity.profile = NULL;
		break;
	}
1328 1329 1330
	integrity.tuple_size = ms;
	blk_integrity_register(disk, &integrity);
	blk_queue_max_integrity_segments(disk->queue, 1);
1331 1332
}
#else
1333
static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type)
1334 1335 1336 1337
{
}
#endif /* CONFIG_BLK_DEV_INTEGRITY */

1338 1339 1340 1341 1342 1343
static void nvme_set_chunk_size(struct nvme_ns *ns)
{
	u32 chunk_size = (((u32)ns->noiob) << (ns->lba_shift - 9));
	blk_queue_chunk_sectors(ns->queue, rounddown_pow_of_two(chunk_size));
}

1344 1345
static void nvme_config_discard(struct nvme_ctrl *ctrl,
		unsigned stream_alignment, struct request_queue *queue)
1346
{
1347 1348 1349 1350
	u32 size = queue_logical_block_size(queue);

	if (stream_alignment)
		size *= stream_alignment;
1351

1352 1353 1354
	BUILD_BUG_ON(PAGE_SIZE / sizeof(struct nvme_dsm_range) <
			NVME_DSM_MAX_RANGES);

1355
	queue->limits.discard_alignment = 0;
1356
	queue->limits.discard_granularity = size;
1357

1358 1359
	blk_queue_max_discard_sectors(queue, UINT_MAX);
	blk_queue_max_discard_segments(queue, NVME_DSM_MAX_RANGES);
1360
	blk_queue_flag_set(QUEUE_FLAG_DISCARD, queue);
1361 1362

	if (ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
1363
		blk_queue_max_write_zeroes_sectors(queue, UINT_MAX);
1364 1365
}

1366
static void nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid,
1367
		struct nvme_id_ns *id, struct nvme_ns_ids *ids)
1368
{
1369 1370
	memset(ids, 0, sizeof(*ids));

1371
	if (ctrl->vs >= NVME_VS(1, 1, 0))
1372
		memcpy(ids->eui64, id->eui64, sizeof(id->eui64));
1373
	if (ctrl->vs >= NVME_VS(1, 2, 0))
1374
		memcpy(ids->nguid, id->nguid, sizeof(id->nguid));
1375
	if (ctrl->vs >= NVME_VS(1, 3, 0)) {
1376 1377 1378
		 /* Don't treat error as fatal we potentially
		  * already have a NGUID or EUI-64
		  */
1379
		if (nvme_identify_ns_descs(ctrl, nsid, ids))
1380
			dev_warn(ctrl->device,
1381 1382
				 "%s: Identify Descriptors failed\n", __func__);
	}
1383 1384
}

C
Christoph Hellwig 已提交
1385 1386 1387 1388 1389 1390 1391
static bool nvme_ns_ids_valid(struct nvme_ns_ids *ids)
{
	return !uuid_is_null(&ids->uuid) ||
		memchr_inv(ids->nguid, 0, sizeof(ids->nguid)) ||
		memchr_inv(ids->eui64, 0, sizeof(ids->eui64));
}

1392 1393 1394 1395 1396 1397 1398
static bool nvme_ns_ids_equal(struct nvme_ns_ids *a, struct nvme_ns_ids *b)
{
	return uuid_equal(&a->uuid, &b->uuid) &&
		memcmp(&a->nguid, &b->nguid, sizeof(a->nguid)) == 0 &&
		memcmp(&a->eui64, &b->eui64, sizeof(a->eui64)) == 0;
}

1399 1400 1401 1402
static void nvme_update_disk_info(struct gendisk *disk,
		struct nvme_ns *ns, struct nvme_id_ns *id)
{
	sector_t capacity = le64_to_cpup(&id->nsze) << (ns->lba_shift - 9);
1403
	unsigned short bs = 1 << ns->lba_shift;
1404 1405 1406 1407 1408 1409 1410 1411
	unsigned stream_alignment = 0;

	if (ns->ctrl->nr_streams && ns->sws && ns->sgs)
		stream_alignment = ns->sws * ns->sgs;

	blk_mq_freeze_queue(disk->queue);
	blk_integrity_unregister(disk);

1412 1413 1414 1415
	blk_queue_logical_block_size(disk->queue, bs);
	blk_queue_physical_block_size(disk->queue, bs);
	blk_queue_io_min(disk->queue, bs);

1416 1417 1418
	if (ns->ms && !ns->ext &&
	    (ns->ctrl->ops->flags & NVME_F_METADATA_SUPPORTED))
		nvme_init_integrity(disk, ns->ms, ns->pi_type);
1419
	if (ns->ms && !nvme_ns_has_pi(ns) && !blk_get_integrity(disk))
1420 1421 1422 1423 1424 1425 1426 1427
		capacity = 0;
	set_capacity(disk, capacity);

	if (ns->ctrl->oncs & NVME_CTRL_ONCS_DSM)
		nvme_config_discard(ns->ctrl, stream_alignment, disk->queue);
	blk_mq_unfreeze_queue(disk->queue);
}

1428 1429 1430
static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
{
	struct nvme_ns *ns = disk->private_data;
1431 1432 1433 1434 1435

	/*
	 * If identify namespace failed, use default 512 byte block size so
	 * block layer can use before failing read/write for 0 capacity.
	 */
1436
	ns->lba_shift = id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ds;
1437 1438
	if (ns->lba_shift == 0)
		ns->lba_shift = 9;
1439
	ns->noiob = le16_to_cpu(id->noiob);
1440 1441 1442 1443 1444 1445 1446
	ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT);
	ns->ms = le16_to_cpu(id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ms);
	/* the PI implementation requires metadata equal t10 pi tuple size */
	if (ns->ms == sizeof(struct t10_pi_tuple))
		ns->pi_type = id->dps & NVME_NS_DPS_PI_MASK;
	else
		ns->pi_type = 0;
1447

1448 1449
	if (ns->noiob)
		nvme_set_chunk_size(ns);
1450
	nvme_update_disk_info(disk, ns, id);
1451 1452 1453 1454
#ifdef CONFIG_NVME_MULTIPATH
	if (ns->head->disk)
		nvme_update_disk_info(ns->head->disk, ns, id);
#endif
1455
}
1456

1457 1458 1459
static int nvme_revalidate_disk(struct gendisk *disk)
{
	struct nvme_ns *ns = disk->private_data;
1460 1461
	struct nvme_ctrl *ctrl = ns->ctrl;
	struct nvme_id_ns *id;
1462
	struct nvme_ns_ids ids;
1463
	int ret = 0;
1464 1465 1466 1467 1468 1469

	if (test_bit(NVME_NS_DEAD, &ns->flags)) {
		set_capacity(disk, 0);
		return -ENODEV;
	}

C
Christoph Hellwig 已提交
1470
	id = nvme_identify_ns(ctrl, ns->head->ns_id);
1471 1472
	if (!id)
		return -ENODEV;
1473

1474 1475 1476 1477
	if (id->ncap == 0) {
		ret = -ENODEV;
		goto out;
	}
1478

1479
	__nvme_revalidate_disk(disk, id);
C
Christoph Hellwig 已提交
1480 1481
	nvme_report_ns_ids(ctrl, ns->head->ns_id, id, &ids);
	if (!nvme_ns_ids_equal(&ns->head->ids, &ids)) {
1482
		dev_err(ctrl->device,
C
Christoph Hellwig 已提交
1483
			"identifiers changed for nsid %d\n", ns->head->ns_id);
1484 1485 1486
		ret = -ENODEV;
	}

1487 1488 1489
out:
	kfree(id);
	return ret;
1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514
}

static char nvme_pr_type(enum pr_type type)
{
	switch (type) {
	case PR_WRITE_EXCLUSIVE:
		return 1;
	case PR_EXCLUSIVE_ACCESS:
		return 2;
	case PR_WRITE_EXCLUSIVE_REG_ONLY:
		return 3;
	case PR_EXCLUSIVE_ACCESS_REG_ONLY:
		return 4;
	case PR_WRITE_EXCLUSIVE_ALL_REGS:
		return 5;
	case PR_EXCLUSIVE_ACCESS_ALL_REGS:
		return 6;
	default:
		return 0;
	}
};

static int nvme_pr_command(struct block_device *bdev, u32 cdw10,
				u64 key, u64 sa_key, u8 op)
{
1515 1516
	struct nvme_ns_head *head = NULL;
	struct nvme_ns *ns;
1517
	struct nvme_command c;
1518
	int srcu_idx, ret;
1519 1520
	u8 data[16] = { 0, };

1521 1522 1523 1524
	ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx);
	if (unlikely(!ns))
		return -EWOULDBLOCK;

1525 1526 1527 1528 1529
	put_unaligned_le64(key, &data[0]);
	put_unaligned_le64(sa_key, &data[8]);

	memset(&c, 0, sizeof(c));
	c.common.opcode = op;
1530
	c.common.nsid = cpu_to_le32(ns->head->ns_id);
1531 1532
	c.common.cdw10[0] = cpu_to_le32(cdw10);

1533
	ret = nvme_submit_sync_cmd(ns->queue, &c, data, 16);
1534 1535
	nvme_put_ns_from_disk(head, srcu_idx);
	return ret;
1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573
}

static int nvme_pr_register(struct block_device *bdev, u64 old,
		u64 new, unsigned flags)
{
	u32 cdw10;

	if (flags & ~PR_FL_IGNORE_KEY)
		return -EOPNOTSUPP;

	cdw10 = old ? 2 : 0;
	cdw10 |= (flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0;
	cdw10 |= (1 << 30) | (1 << 31); /* PTPL=1 */
	return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_register);
}

static int nvme_pr_reserve(struct block_device *bdev, u64 key,
		enum pr_type type, unsigned flags)
{
	u32 cdw10;

	if (flags & ~PR_FL_IGNORE_KEY)
		return -EOPNOTSUPP;

	cdw10 = nvme_pr_type(type) << 8;
	cdw10 |= ((flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0);
	return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_acquire);
}

static int nvme_pr_preempt(struct block_device *bdev, u64 old, u64 new,
		enum pr_type type, bool abort)
{
	u32 cdw10 = nvme_pr_type(type) << 8 | abort ? 2 : 1;
	return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_acquire);
}

static int nvme_pr_clear(struct block_device *bdev, u64 key)
{
1574
	u32 cdw10 = 1 | (key ? 1 << 3 : 0);
1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591
	return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_register);
}

static int nvme_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
{
	u32 cdw10 = nvme_pr_type(type) << 8 | key ? 1 << 3 : 0;
	return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_release);
}

static const struct pr_ops nvme_pr_ops = {
	.pr_register	= nvme_pr_register,
	.pr_reserve	= nvme_pr_reserve,
	.pr_release	= nvme_pr_release,
	.pr_preempt	= nvme_pr_preempt,
	.pr_clear	= nvme_pr_clear,
};

1592
#ifdef CONFIG_BLK_SED_OPAL
1593 1594
int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
		bool send)
1595
{
1596
	struct nvme_ctrl *ctrl = data;
1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613
	struct nvme_command cmd;

	memset(&cmd, 0, sizeof(cmd));
	if (send)
		cmd.common.opcode = nvme_admin_security_send;
	else
		cmd.common.opcode = nvme_admin_security_recv;
	cmd.common.nsid = 0;
	cmd.common.cdw10[0] = cpu_to_le32(((u32)secp) << 24 | ((u32)spsp) << 8);
	cmd.common.cdw10[1] = cpu_to_le32(len);

	return __nvme_submit_sync_cmd(ctrl->admin_q, &cmd, NULL, buffer, len,
				      ADMIN_TIMEOUT, NVME_QID_ANY, 1, 0);
}
EXPORT_SYMBOL_GPL(nvme_sec_submit);
#endif /* CONFIG_BLK_SED_OPAL */

1614
static const struct block_device_operations nvme_fops = {
1615 1616
	.owner		= THIS_MODULE,
	.ioctl		= nvme_ioctl,
1617
	.compat_ioctl	= nvme_ioctl,
1618 1619 1620 1621 1622 1623 1624
	.open		= nvme_open,
	.release	= nvme_release,
	.getgeo		= nvme_getgeo,
	.revalidate_disk= nvme_revalidate_disk,
	.pr_ops		= &nvme_pr_ops,
};

1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650
#ifdef CONFIG_NVME_MULTIPATH
static int nvme_ns_head_open(struct block_device *bdev, fmode_t mode)
{
	struct nvme_ns_head *head = bdev->bd_disk->private_data;

	if (!kref_get_unless_zero(&head->ref))
		return -ENXIO;
	return 0;
}

static void nvme_ns_head_release(struct gendisk *disk, fmode_t mode)
{
	nvme_put_ns_head(disk->private_data);
}

const struct block_device_operations nvme_ns_head_ops = {
	.owner		= THIS_MODULE,
	.open		= nvme_ns_head_open,
	.release	= nvme_ns_head_release,
	.ioctl		= nvme_ioctl,
	.compat_ioctl	= nvme_ioctl,
	.getgeo		= nvme_getgeo,
	.pr_ops		= &nvme_pr_ops,
};
#endif /* CONFIG_NVME_MULTIPATH */

1651 1652 1653 1654 1655 1656 1657 1658
static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled)
{
	unsigned long timeout =
		((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
	u32 csts, bit = enabled ? NVME_CSTS_RDY : 0;
	int ret;

	while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
K
Keith Busch 已提交
1659 1660
		if (csts == ~0)
			return -ENODEV;
1661 1662 1663 1664 1665 1666 1667
		if ((csts & NVME_CSTS_RDY) == bit)
			break;

		msleep(100);
		if (fatal_signal_pending(current))
			return -EINTR;
		if (time_after(jiffies, timeout)) {
1668
			dev_err(ctrl->device,
1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693
				"Device not ready; aborting %s\n", enabled ?
						"initialisation" : "reset");
			return -ENODEV;
		}
	}

	return ret;
}

/*
 * If the device has been passed off to us in an enabled state, just clear
 * the enabled bit.  The spec says we should set the 'shutdown notification
 * bits', but doing so may cause the device to complete commands to the
 * admin queue ... and we don't know what memory that might be pointing at!
 */
int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
{
	int ret;

	ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
	ctrl->ctrl_config &= ~NVME_CC_ENABLE;

	ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
	if (ret)
		return ret;
1694

1695
	if (ctrl->quirks & NVME_QUIRK_DELAY_BEFORE_CHK_RDY)
1696 1697
		msleep(NVME_QUIRK_DELAY_AMOUNT);

1698 1699
	return nvme_wait_ready(ctrl, cap, false);
}
1700
EXPORT_SYMBOL_GPL(nvme_disable_ctrl);
1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712

int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
{
	/*
	 * Default to a 4K page size, with the intention to update this
	 * path in the future to accomodate architectures with differing
	 * kernel and IO page sizes.
	 */
	unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12, page_shift = 12;
	int ret;

	if (page_shift < dev_page_min) {
1713
		dev_err(ctrl->device,
1714 1715 1716 1717 1718 1719 1720 1721 1722
			"Minimum device page size %u too large for host (%u)\n",
			1 << dev_page_min, 1 << page_shift);
		return -ENODEV;
	}

	ctrl->page_size = 1 << page_shift;

	ctrl->ctrl_config = NVME_CC_CSS_NVM;
	ctrl->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT;
1723
	ctrl->ctrl_config |= NVME_CC_AMS_RR | NVME_CC_SHN_NONE;
1724 1725 1726 1727 1728 1729 1730 1731
	ctrl->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;
	ctrl->ctrl_config |= NVME_CC_ENABLE;

	ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
	if (ret)
		return ret;
	return nvme_wait_ready(ctrl, cap, true);
}
1732
EXPORT_SYMBOL_GPL(nvme_enable_ctrl);
1733 1734 1735

int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
{
1736
	unsigned long timeout = jiffies + (ctrl->shutdown_timeout * HZ);
1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754
	u32 csts;
	int ret;

	ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
	ctrl->ctrl_config |= NVME_CC_SHN_NORMAL;

	ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
	if (ret)
		return ret;

	while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
		if ((csts & NVME_CSTS_SHST_MASK) == NVME_CSTS_SHST_CMPLT)
			break;

		msleep(100);
		if (fatal_signal_pending(current))
			return -EINTR;
		if (time_after(jiffies, timeout)) {
1755
			dev_err(ctrl->device,
1756 1757 1758 1759 1760 1761 1762
				"Device shutdown incomplete; abort shutdown\n");
			return -ENODEV;
		}
	}

	return ret;
}
1763
EXPORT_SYMBOL_GPL(nvme_shutdown_ctrl);
1764

1765 1766 1767
static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
		struct request_queue *q)
{
1768 1769
	bool vwc = false;

1770
	if (ctrl->max_hw_sectors) {
1771 1772 1773
		u32 max_segments =
			(ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1;

1774
		blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
1775
		blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
1776
	}
1777 1778
	if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) &&
	    is_power_of_2(ctrl->max_hw_sectors))
K
Keith Busch 已提交
1779
		blk_queue_chunk_sectors(q, ctrl->max_hw_sectors);
1780
	blk_queue_virt_boundary(q, ctrl->page_size - 1);
1781 1782 1783
	if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
		vwc = true;
	blk_queue_write_cache(q, vwc, vwc);
1784 1785
}

1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802
static int nvme_configure_timestamp(struct nvme_ctrl *ctrl)
{
	__le64 ts;
	int ret;

	if (!(ctrl->oncs & NVME_CTRL_ONCS_TIMESTAMP))
		return 0;

	ts = cpu_to_le64(ktime_to_ms(ktime_get_real()));
	ret = nvme_set_features(ctrl, NVME_FEAT_TIMESTAMP, 0, &ts, sizeof(ts),
			NULL);
	if (ret)
		dev_warn_once(ctrl->device,
			"could not set timestamp (%d)\n", ret);
	return ret;
}

1803
static int nvme_configure_apst(struct nvme_ctrl *ctrl)
1804 1805 1806 1807 1808 1809 1810 1811
{
	/*
	 * APST (Autonomous Power State Transition) lets us program a
	 * table of power state transitions that the controller will
	 * perform automatically.  We configure it with a simple
	 * heuristic: we are willing to spend at most 2% of the time
	 * transitioning between power states.  Therefore, when running
	 * in any given state, we will enter the next lower-power
A
Andy Lutomirski 已提交
1812
	 * non-operational state after waiting 50 * (enlat + exlat)
1813
	 * microseconds, as long as that state's exit latency is under
1814 1815 1816 1817 1818 1819 1820 1821 1822
	 * the requested maximum latency.
	 *
	 * We will not autonomously enter any non-operational state for
	 * which the total latency exceeds ps_max_latency_us.  Users
	 * can set ps_max_latency_us to zero to turn off APST.
	 */

	unsigned apste;
	struct nvme_feat_auto_pst *table;
1823 1824
	u64 max_lat_us = 0;
	int max_ps = -1;
1825 1826 1827 1828 1829 1830 1831
	int ret;

	/*
	 * If APST isn't supported or if we haven't been initialized yet,
	 * then don't do anything.
	 */
	if (!ctrl->apsta)
1832
		return 0;
1833 1834 1835

	if (ctrl->npss > 31) {
		dev_warn(ctrl->device, "NPSS is invalid; not using APST\n");
1836
		return 0;
1837 1838 1839 1840
	}

	table = kzalloc(sizeof(*table), GFP_KERNEL);
	if (!table)
1841
		return 0;
1842

1843
	if (!ctrl->apst_enabled || ctrl->ps_max_latency_us == 0) {
1844 1845
		/* Turn off APST. */
		apste = 0;
1846
		dev_dbg(ctrl->device, "APST disabled\n");
1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857
	} else {
		__le64 target = cpu_to_le64(0);
		int state;

		/*
		 * Walk through all states from lowest- to highest-power.
		 * According to the spec, lower-numbered states use more
		 * power.  NPSS, despite the name, is the index of the
		 * lowest-power state, not the number of states.
		 */
		for (state = (int)ctrl->npss; state >= 0; state--) {
1858
			u64 total_latency_us, exit_latency_us, transition_ms;
1859 1860 1861 1862

			if (target)
				table->entries[state] = target;

1863 1864 1865 1866 1867 1868 1869 1870
			/*
			 * Don't allow transitions to the deepest state
			 * if it's quirked off.
			 */
			if (state == ctrl->npss &&
			    (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS))
				continue;

1871 1872 1873 1874 1875 1876 1877 1878
			/*
			 * Is this state a useful non-operational state for
			 * higher-power states to autonomously transition to?
			 */
			if (!(ctrl->psd[state].flags &
			      NVME_PS_FLAGS_NON_OP_STATE))
				continue;

1879 1880 1881
			exit_latency_us =
				(u64)le32_to_cpu(ctrl->psd[state].exit_lat);
			if (exit_latency_us > ctrl->ps_max_latency_us)
1882 1883
				continue;

1884 1885 1886 1887
			total_latency_us =
				exit_latency_us +
				le32_to_cpu(ctrl->psd[state].entry_lat);

1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898
			/*
			 * This state is good.  Use it as the APST idle
			 * target for higher power states.
			 */
			transition_ms = total_latency_us + 19;
			do_div(transition_ms, 20);
			if (transition_ms > (1 << 24) - 1)
				transition_ms = (1 << 24) - 1;

			target = cpu_to_le64((state << 3) |
					     (transition_ms << 8));
1899 1900 1901 1902 1903 1904

			if (max_ps == -1)
				max_ps = state;

			if (total_latency_us > max_lat_us)
				max_lat_us = total_latency_us;
1905 1906 1907
		}

		apste = 1;
1908 1909 1910 1911 1912 1913 1914

		if (max_ps == -1) {
			dev_dbg(ctrl->device, "APST enabled but no non-operational states are available\n");
		} else {
			dev_dbg(ctrl->device, "APST enabled: max PS = %d, max round-trip latency = %lluus, table = %*phN\n",
				max_ps, max_lat_us, (int)sizeof(*table), table);
		}
1915 1916 1917 1918 1919 1920 1921 1922
	}

	ret = nvme_set_features(ctrl, NVME_FEAT_AUTO_PST, apste,
				table, sizeof(*table), NULL);
	if (ret)
		dev_err(ctrl->device, "failed to set APST feature (%d)\n", ret);

	kfree(table);
1923
	return ret;
1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946
}

static void nvme_set_latency_tolerance(struct device *dev, s32 val)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
	u64 latency;

	switch (val) {
	case PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT:
	case PM_QOS_LATENCY_ANY:
		latency = U64_MAX;
		break;

	default:
		latency = val;
	}

	if (ctrl->ps_max_latency_us != latency) {
		ctrl->ps_max_latency_us = latency;
		nvme_configure_apst(ctrl);
	}
}

1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959
struct nvme_core_quirk_entry {
	/*
	 * NVMe model and firmware strings are padded with spaces.  For
	 * simplicity, strings in the quirk table are padded with NULLs
	 * instead.
	 */
	u16 vid;
	const char *mn;
	const char *fr;
	unsigned long quirks;
};

static const struct nvme_core_quirk_entry core_quirks[] = {
1960
	{
1961 1962 1963 1964 1965 1966
		/*
		 * This Toshiba device seems to die using any APST states.  See:
		 * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1678184/comments/11
		 */
		.vid = 0x1179,
		.mn = "THNSF5256GPUK TOSHIBA",
1967
		.quirks = NVME_QUIRK_NO_APST,
1968
	}
1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999
};

/* match is null-terminated but idstr is space-padded. */
static bool string_matches(const char *idstr, const char *match, size_t len)
{
	size_t matchlen;

	if (!match)
		return true;

	matchlen = strlen(match);
	WARN_ON_ONCE(matchlen > len);

	if (memcmp(idstr, match, matchlen))
		return false;

	for (; matchlen < len; matchlen++)
		if (idstr[matchlen] != ' ')
			return false;

	return true;
}

static bool quirk_matches(const struct nvme_id_ctrl *id,
			  const struct nvme_core_quirk_entry *q)
{
	return q->vid == le16_to_cpu(id->vid) &&
		string_matches(id->mn, q->mn, sizeof(id->mn)) &&
		string_matches(id->fr, q->fr, sizeof(id->fr));
}

C
Christoph Hellwig 已提交
2000 2001
static void nvme_init_subnqn(struct nvme_subsystem *subsys, struct nvme_ctrl *ctrl,
		struct nvme_id_ctrl *id)
2002 2003 2004 2005 2006 2007
{
	size_t nqnlen;
	int off;

	nqnlen = strnlen(id->subnqn, NVMF_NQN_SIZE);
	if (nqnlen > 0 && nqnlen < NVMF_NQN_SIZE) {
C
Christoph Hellwig 已提交
2008
		strncpy(subsys->subnqn, id->subnqn, NVMF_NQN_SIZE);
2009 2010 2011 2012 2013 2014 2015
		return;
	}

	if (ctrl->vs >= NVME_VS(1, 2, 1))
		dev_warn(ctrl->device, "missing or invalid SUBNQN field.\n");

	/* Generate a "fake" NQN per Figure 254 in NVMe 1.3 + ECN 001 */
C
Christoph Hellwig 已提交
2016
	off = snprintf(subsys->subnqn, NVMF_NQN_SIZE,
2017 2018
			"nqn.2014.08.org.nvmexpress:%4x%4x",
			le16_to_cpu(id->vid), le16_to_cpu(id->ssvid));
C
Christoph Hellwig 已提交
2019
	memcpy(subsys->subnqn + off, id->sn, sizeof(id->sn));
2020
	off += sizeof(id->sn);
C
Christoph Hellwig 已提交
2021
	memcpy(subsys->subnqn + off, id->mn, sizeof(id->mn));
2022
	off += sizeof(id->mn);
C
Christoph Hellwig 已提交
2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045
	memset(subsys->subnqn + off, 0, sizeof(subsys->subnqn) - off);
}

static void __nvme_release_subsystem(struct nvme_subsystem *subsys)
{
	ida_simple_remove(&nvme_subsystems_ida, subsys->instance);
	kfree(subsys);
}

static void nvme_release_subsystem(struct device *dev)
{
	__nvme_release_subsystem(container_of(dev, struct nvme_subsystem, dev));
}

static void nvme_destroy_subsystem(struct kref *ref)
{
	struct nvme_subsystem *subsys =
			container_of(ref, struct nvme_subsystem, ref);

	mutex_lock(&nvme_subsystems_lock);
	list_del(&subsys->entry);
	mutex_unlock(&nvme_subsystems_lock);

C
Christoph Hellwig 已提交
2046
	ida_destroy(&subsys->ns_ida);
C
Christoph Hellwig 已提交
2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072
	device_del(&subsys->dev);
	put_device(&subsys->dev);
}

static void nvme_put_subsystem(struct nvme_subsystem *subsys)
{
	kref_put(&subsys->ref, nvme_destroy_subsystem);
}

static struct nvme_subsystem *__nvme_find_get_subsystem(const char *subsysnqn)
{
	struct nvme_subsystem *subsys;

	lockdep_assert_held(&nvme_subsystems_lock);

	list_for_each_entry(subsys, &nvme_subsystems, entry) {
		if (strcmp(subsys->subnqn, subsysnqn))
			continue;
		if (!kref_get_unless_zero(&subsys->ref))
			continue;
		return subsys;
	}

	return NULL;
}

2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119
#define SUBSYS_ATTR_RO(_name, _mode, _show)			\
	struct device_attribute subsys_attr_##_name = \
		__ATTR(_name, _mode, _show, NULL)

static ssize_t nvme_subsys_show_nqn(struct device *dev,
				    struct device_attribute *attr,
				    char *buf)
{
	struct nvme_subsystem *subsys =
		container_of(dev, struct nvme_subsystem, dev);

	return snprintf(buf, PAGE_SIZE, "%s\n", subsys->subnqn);
}
static SUBSYS_ATTR_RO(subsysnqn, S_IRUGO, nvme_subsys_show_nqn);

#define nvme_subsys_show_str_function(field)				\
static ssize_t subsys_##field##_show(struct device *dev,		\
			    struct device_attribute *attr, char *buf)	\
{									\
	struct nvme_subsystem *subsys =					\
		container_of(dev, struct nvme_subsystem, dev);		\
	return sprintf(buf, "%.*s\n",					\
		       (int)sizeof(subsys->field), subsys->field);	\
}									\
static SUBSYS_ATTR_RO(field, S_IRUGO, subsys_##field##_show);

nvme_subsys_show_str_function(model);
nvme_subsys_show_str_function(serial);
nvme_subsys_show_str_function(firmware_rev);

static struct attribute *nvme_subsys_attrs[] = {
	&subsys_attr_model.attr,
	&subsys_attr_serial.attr,
	&subsys_attr_firmware_rev.attr,
	&subsys_attr_subsysnqn.attr,
	NULL,
};

static struct attribute_group nvme_subsys_attrs_group = {
	.attrs = nvme_subsys_attrs,
};

static const struct attribute_group *nvme_subsys_attrs_groups[] = {
	&nvme_subsys_attrs_group,
	NULL,
};

2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135
static int nvme_active_ctrls(struct nvme_subsystem *subsys)
{
	int count = 0;
	struct nvme_ctrl *ctrl;

	mutex_lock(&subsys->lock);
	list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) {
		if (ctrl->state != NVME_CTRL_DELETING &&
		    ctrl->state != NVME_CTRL_DEAD)
			count++;
	}
	mutex_unlock(&subsys->lock);

	return count;
}

C
Christoph Hellwig 已提交
2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152
static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
{
	struct nvme_subsystem *subsys, *found;
	int ret;

	subsys = kzalloc(sizeof(*subsys), GFP_KERNEL);
	if (!subsys)
		return -ENOMEM;
	ret = ida_simple_get(&nvme_subsystems_ida, 0, 0, GFP_KERNEL);
	if (ret < 0) {
		kfree(subsys);
		return ret;
	}
	subsys->instance = ret;
	mutex_init(&subsys->lock);
	kref_init(&subsys->ref);
	INIT_LIST_HEAD(&subsys->ctrls);
C
Christoph Hellwig 已提交
2153
	INIT_LIST_HEAD(&subsys->nsheads);
C
Christoph Hellwig 已提交
2154 2155 2156 2157 2158 2159 2160 2161 2162
	nvme_init_subnqn(subsys, ctrl, id);
	memcpy(subsys->serial, id->sn, sizeof(subsys->serial));
	memcpy(subsys->model, id->mn, sizeof(subsys->model));
	memcpy(subsys->firmware_rev, id->fr, sizeof(subsys->firmware_rev));
	subsys->vendor_id = le16_to_cpu(id->vid);
	subsys->cmic = id->cmic;

	subsys->dev.class = nvme_subsys_class;
	subsys->dev.release = nvme_release_subsystem;
2163
	subsys->dev.groups = nvme_subsys_attrs_groups;
C
Christoph Hellwig 已提交
2164 2165 2166 2167 2168 2169 2170 2171 2172 2173
	dev_set_name(&subsys->dev, "nvme-subsys%d", subsys->instance);
	device_initialize(&subsys->dev);

	mutex_lock(&nvme_subsystems_lock);
	found = __nvme_find_get_subsystem(subsys->subnqn);
	if (found) {
		/*
		 * Verify that the subsystem actually supports multiple
		 * controllers, else bail out.
		 */
2174
		if (nvme_active_ctrls(found) && !(id->cmic & (1 << 1))) {
C
Christoph Hellwig 已提交
2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191
			dev_err(ctrl->device,
				"ignoring ctrl due to duplicate subnqn (%s).\n",
				found->subnqn);
			nvme_put_subsystem(found);
			ret = -EINVAL;
			goto out_unlock;
		}

		__nvme_release_subsystem(subsys);
		subsys = found;
	} else {
		ret = device_add(&subsys->dev);
		if (ret) {
			dev_err(ctrl->device,
				"failed to register subsystem device.\n");
			goto out_unlock;
		}
C
Christoph Hellwig 已提交
2192
		ida_init(&subsys->ns_ida);
C
Christoph Hellwig 已提交
2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216
		list_add_tail(&subsys->entry, &nvme_subsystems);
	}

	ctrl->subsys = subsys;
	mutex_unlock(&nvme_subsystems_lock);

	if (sysfs_create_link(&subsys->dev.kobj, &ctrl->device->kobj,
			dev_name(ctrl->device))) {
		dev_err(ctrl->device,
			"failed to create sysfs link from subsystem.\n");
		/* the transport driver will eventually put the subsystem */
		return -EINVAL;
	}

	mutex_lock(&subsys->lock);
	list_add_tail(&ctrl->subsys_entry, &subsys->ctrls);
	mutex_unlock(&subsys->lock);

	return 0;

out_unlock:
	mutex_unlock(&nvme_subsystems_lock);
	put_device(&subsys->dev);
	return ret;
2217 2218
}

2219 2220 2221
static int nvme_get_log_ext(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
			    u8 log_page, void *log,
			    size_t size, size_t offset)
K
Keith Busch 已提交
2222 2223
{
	struct nvme_command c = { };
2224 2225 2226 2227 2228 2229 2230 2231
	unsigned long dwlen = size / 4 - 1;

	c.get_log_page.opcode = nvme_admin_get_log_page;

	if (ns)
		c.get_log_page.nsid = cpu_to_le32(ns->head->ns_id);
	else
		c.get_log_page.nsid = cpu_to_le32(NVME_NSID_ALL);
K
Keith Busch 已提交
2232

2233 2234 2235 2236 2237
	c.get_log_page.lid = log_page;
	c.get_log_page.numdl = cpu_to_le16(dwlen & ((1 << 16) - 1));
	c.get_log_page.numdu = cpu_to_le16(dwlen >> 16);
	c.get_log_page.lpol = cpu_to_le32(offset & ((1ULL << 32) - 1));
	c.get_log_page.lpou = cpu_to_le32(offset >> 32ULL);
K
Keith Busch 已提交
2238 2239 2240 2241

	return nvme_submit_sync_cmd(ctrl->admin_q, &c, log, size);
}

2242 2243 2244 2245 2246 2247
static int nvme_get_log(struct nvme_ctrl *ctrl, u8 log_page, void *log,
			size_t size)
{
	return nvme_get_log_ext(ctrl, NULL, log_page, log, size, 0);
}

2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264
static int nvme_get_effects_log(struct nvme_ctrl *ctrl)
{
	int ret;

	if (!ctrl->effects)
		ctrl->effects = kzalloc(sizeof(*ctrl->effects), GFP_KERNEL);

	if (!ctrl->effects)
		return 0;

	ret = nvme_get_log(ctrl, NVME_LOG_CMD_EFFECTS, ctrl->effects,
					sizeof(*ctrl->effects));
	if (ret) {
		kfree(ctrl->effects);
		ctrl->effects = NULL;
	}
	return ret;
2265 2266
}

2267 2268 2269 2270 2271 2272 2273 2274 2275 2276
/*
 * Initialize the cached copies of the Identify data and various controller
 * register in our nvme_ctrl structure.  This should be called as soon as
 * the admin queue is fully up and running.
 */
int nvme_init_identify(struct nvme_ctrl *ctrl)
{
	struct nvme_id_ctrl *id;
	u64 cap;
	int ret, page_shift;
2277
	u32 max_hw_sectors;
2278
	bool prev_apst_enabled;
2279

2280 2281
	ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs);
	if (ret) {
2282
		dev_err(ctrl->device, "Reading VS failed (%d)\n", ret);
2283 2284 2285
		return ret;
	}

2286 2287
	ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &cap);
	if (ret) {
2288
		dev_err(ctrl->device, "Reading CAP failed (%d)\n", ret);
2289 2290 2291 2292
		return ret;
	}
	page_shift = NVME_CAP_MPSMIN(cap) + 12;

2293
	if (ctrl->vs >= NVME_VS(1, 1, 0))
2294 2295
		ctrl->subsystem = NVME_CAP_NSSRC(cap);

2296 2297
	ret = nvme_identify_ctrl(ctrl, &id);
	if (ret) {
2298
		dev_err(ctrl->device, "Identify Controller failed (%d)\n", ret);
2299 2300 2301
		return -EIO;
	}

2302 2303 2304 2305 2306
	if (id->lpa & NVME_CTRL_LPA_CMD_EFFECTS_LOG) {
		ret = nvme_get_effects_log(ctrl);
		if (ret < 0)
			return ret;
	}
2307

2308
	if (!ctrl->identified) {
C
Christoph Hellwig 已提交
2309 2310 2311 2312 2313 2314
		int i;

		ret = nvme_init_subsystem(ctrl, id);
		if (ret)
			goto out_free;

2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328
		/*
		 * Check for quirks.  Quirk can depend on firmware version,
		 * so, in principle, the set of quirks present can change
		 * across a reset.  As a possible future enhancement, we
		 * could re-scan for quirks every time we reinitialize
		 * the device, but we'd have to make sure that the driver
		 * behaves intelligently if the quirks change.
		 */
		for (i = 0; i < ARRAY_SIZE(core_quirks); i++) {
			if (quirk_matches(id, &core_quirks[i]))
				ctrl->quirks |= core_quirks[i].quirks;
		}
	}

2329
	if (force_apst && (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS)) {
2330
		dev_warn(ctrl->device, "forcibly allowing all power states due to nvme_core.force_apst -- use at your own risk\n");
2331 2332 2333
		ctrl->quirks &= ~NVME_QUIRK_NO_DEEPEST_PS;
	}

2334
	ctrl->oacs = le16_to_cpu(id->oacs);
2335
	ctrl->oncs = le16_to_cpup(&id->oncs);
2336
	atomic_set(&ctrl->abort_limit, id->acl + 1);
2337
	ctrl->vwc = id->vwc;
M
Ming Lin 已提交
2338
	ctrl->cntlid = le16_to_cpup(&id->cntlid);
2339
	if (id->mdts)
2340
		max_hw_sectors = 1 << (id->mdts + page_shift - 9);
2341
	else
2342 2343 2344
		max_hw_sectors = UINT_MAX;
	ctrl->max_hw_sectors =
		min_not_zero(ctrl->max_hw_sectors, max_hw_sectors);
2345

2346
	nvme_set_queue_limits(ctrl, ctrl->admin_q);
2347
	ctrl->sgls = le32_to_cpu(id->sgls);
S
Sagi Grimberg 已提交
2348
	ctrl->kas = le16_to_cpu(id->kas);
2349

2350 2351 2352 2353 2354 2355 2356 2357
	if (id->rtd3e) {
		/* us -> s */
		u32 transition_time = le32_to_cpu(id->rtd3e) / 1000000;

		ctrl->shutdown_timeout = clamp_t(unsigned int, transition_time,
						 shutdown_timeout, 60);

		if (ctrl->shutdown_timeout != shutdown_timeout)
2358
			dev_info(ctrl->device,
2359 2360 2361 2362 2363
				 "Shutdown timeout set to %u seconds\n",
				 ctrl->shutdown_timeout);
	} else
		ctrl->shutdown_timeout = shutdown_timeout;

2364
	ctrl->npss = id->npss;
2365 2366
	ctrl->apsta = id->apsta;
	prev_apst_enabled = ctrl->apst_enabled;
2367 2368
	if (ctrl->quirks & NVME_QUIRK_NO_APST) {
		if (force_apst && id->apsta) {
2369
			dev_warn(ctrl->device, "forcibly allowing APST due to nvme_core.force_apst -- use at your own risk\n");
2370
			ctrl->apst_enabled = true;
2371
		} else {
2372
			ctrl->apst_enabled = false;
2373 2374
		}
	} else {
2375
		ctrl->apst_enabled = id->apsta;
2376
	}
2377 2378
	memcpy(ctrl->psd, id->psd, sizeof(ctrl->psd));

2379
	if (ctrl->ops->flags & NVME_F_FABRICS) {
2380 2381 2382 2383 2384 2385 2386 2387 2388
		ctrl->icdoff = le16_to_cpu(id->icdoff);
		ctrl->ioccsz = le32_to_cpu(id->ioccsz);
		ctrl->iorcsz = le32_to_cpu(id->iorcsz);
		ctrl->maxcmd = le16_to_cpu(id->maxcmd);

		/*
		 * In fabrics we need to verify the cntlid matches the
		 * admin connect
		 */
2389
		if (ctrl->cntlid != le16_to_cpu(id->cntlid)) {
2390
			ret = -EINVAL;
2391 2392
			goto out_free;
		}
S
Sagi Grimberg 已提交
2393 2394

		if (!ctrl->opts->discovery_nqn && !ctrl->kas) {
2395
			dev_err(ctrl->device,
S
Sagi Grimberg 已提交
2396 2397
				"keep-alive support is mandatory for fabrics\n");
			ret = -EINVAL;
2398
			goto out_free;
S
Sagi Grimberg 已提交
2399
		}
2400 2401
	} else {
		ctrl->cntlid = le16_to_cpu(id->cntlid);
2402 2403
		ctrl->hmpre = le32_to_cpu(id->hmpre);
		ctrl->hmmin = le32_to_cpu(id->hmmin);
2404 2405
		ctrl->hmminds = le32_to_cpu(id->hmminds);
		ctrl->hmmaxd = le16_to_cpu(id->hmmaxd);
2406
	}
2407

2408
	kfree(id);
2409

2410
	if (ctrl->apst_enabled && !prev_apst_enabled)
2411
		dev_pm_qos_expose_latency_tolerance(ctrl->device);
2412
	else if (!ctrl->apst_enabled && prev_apst_enabled)
2413 2414
		dev_pm_qos_hide_latency_tolerance(ctrl->device);

2415 2416 2417
	ret = nvme_configure_apst(ctrl);
	if (ret < 0)
		return ret;
2418 2419 2420 2421
	
	ret = nvme_configure_timestamp(ctrl);
	if (ret < 0)
		return ret;
2422 2423 2424 2425

	ret = nvme_configure_directives(ctrl);
	if (ret < 0)
		return ret;
2426

2427
	ctrl->identified = true;
2428

2429 2430 2431 2432
	return 0;

out_free:
	kfree(id);
2433
	return ret;
2434
}
2435
EXPORT_SYMBOL_GPL(nvme_init_identify);
2436

2437
static int nvme_dev_open(struct inode *inode, struct file *file)
2438
{
2439 2440
	struct nvme_ctrl *ctrl =
		container_of(inode->i_cdev, struct nvme_ctrl, cdev);
2441

2442 2443 2444 2445 2446
	switch (ctrl->state) {
	case NVME_CTRL_LIVE:
	case NVME_CTRL_ADMIN_ONLY:
		break;
	default:
2447
		return -EWOULDBLOCK;
2448 2449
	}

2450
	file->private_data = ctrl;
2451 2452 2453
	return 0;
}

2454 2455 2456 2457 2458
static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp)
{
	struct nvme_ns *ns;
	int ret;

2459
	down_read(&ctrl->namespaces_rwsem);
2460 2461 2462 2463 2464 2465 2466
	if (list_empty(&ctrl->namespaces)) {
		ret = -ENOTTY;
		goto out_unlock;
	}

	ns = list_first_entry(&ctrl->namespaces, struct nvme_ns, list);
	if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) {
2467
		dev_warn(ctrl->device,
2468 2469 2470 2471 2472
			"NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n");
		ret = -EINVAL;
		goto out_unlock;
	}

2473
	dev_warn(ctrl->device,
2474 2475
		"using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n");
	kref_get(&ns->kref);
2476
	up_read(&ctrl->namespaces_rwsem);
2477 2478 2479 2480 2481 2482

	ret = nvme_user_cmd(ctrl, ns, argp);
	nvme_put_ns(ns);
	return ret;

out_unlock:
2483
	up_read(&ctrl->namespaces_rwsem);
2484 2485 2486
	return ret;
}

2487 2488 2489 2490 2491 2492 2493 2494 2495 2496
static long nvme_dev_ioctl(struct file *file, unsigned int cmd,
		unsigned long arg)
{
	struct nvme_ctrl *ctrl = file->private_data;
	void __user *argp = (void __user *)arg;

	switch (cmd) {
	case NVME_IOCTL_ADMIN_CMD:
		return nvme_user_cmd(ctrl, NULL, argp);
	case NVME_IOCTL_IO_CMD:
2497
		return nvme_dev_user_cmd(ctrl, argp);
2498
	case NVME_IOCTL_RESET:
2499
		dev_warn(ctrl->device, "resetting controller\n");
2500
		return nvme_reset_ctrl_sync(ctrl);
2501 2502
	case NVME_IOCTL_SUBSYS_RESET:
		return nvme_reset_subsystem(ctrl);
K
Keith Busch 已提交
2503 2504 2505
	case NVME_IOCTL_RESCAN:
		nvme_queue_scan(ctrl);
		return 0;
2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524
	default:
		return -ENOTTY;
	}
}

static const struct file_operations nvme_dev_fops = {
	.owner		= THIS_MODULE,
	.open		= nvme_dev_open,
	.unlocked_ioctl	= nvme_dev_ioctl,
	.compat_ioctl	= nvme_dev_ioctl,
};

static ssize_t nvme_sysfs_reset(struct device *dev,
				struct device_attribute *attr, const char *buf,
				size_t count)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
	int ret;

2525
	ret = nvme_reset_ctrl_sync(ctrl);
2526 2527 2528
	if (ret < 0)
		return ret;
	return count;
2529
}
2530
static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset);
2531

K
Keith Busch 已提交
2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542
static ssize_t nvme_sysfs_rescan(struct device *dev,
				struct device_attribute *attr, const char *buf,
				size_t count)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);

	nvme_queue_scan(ctrl);
	return count;
}
static DEVICE_ATTR(rescan_controller, S_IWUSR, NULL, nvme_sysfs_rescan);

2543 2544 2545 2546 2547 2548 2549 2550 2551 2552
static inline struct nvme_ns_head *dev_to_ns_head(struct device *dev)
{
	struct gendisk *disk = dev_to_disk(dev);

	if (disk->fops == &nvme_fops)
		return nvme_get_ns_from_dev(dev)->head;
	else
		return disk->private_data;
}

2553
static ssize_t wwid_show(struct device *dev, struct device_attribute *attr,
2554
		char *buf)
2555
{
2556 2557 2558
	struct nvme_ns_head *head = dev_to_ns_head(dev);
	struct nvme_ns_ids *ids = &head->ids;
	struct nvme_subsystem *subsys = head->subsys;
C
Christoph Hellwig 已提交
2559 2560
	int serial_len = sizeof(subsys->serial);
	int model_len = sizeof(subsys->model);
2561

2562 2563
	if (!uuid_is_null(&ids->uuid))
		return sprintf(buf, "uuid.%pU\n", &ids->uuid);
2564

2565 2566
	if (memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
		return sprintf(buf, "eui.%16phN\n", ids->nguid);
2567

2568 2569
	if (memchr_inv(ids->eui64, 0, sizeof(ids->eui64)))
		return sprintf(buf, "eui.%8phN\n", ids->eui64);
2570

C
Christoph Hellwig 已提交
2571 2572
	while (serial_len > 0 && (subsys->serial[serial_len - 1] == ' ' ||
				  subsys->serial[serial_len - 1] == '\0'))
2573
		serial_len--;
C
Christoph Hellwig 已提交
2574 2575
	while (model_len > 0 && (subsys->model[model_len - 1] == ' ' ||
				 subsys->model[model_len - 1] == '\0'))
2576 2577
		model_len--;

C
Christoph Hellwig 已提交
2578 2579
	return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", subsys->vendor_id,
		serial_len, subsys->serial, model_len, subsys->model,
2580
		head->ns_id);
2581
}
J
Joe Perches 已提交
2582
static DEVICE_ATTR_RO(wwid);
2583

2584
static ssize_t nguid_show(struct device *dev, struct device_attribute *attr,
2585
		char *buf)
2586
{
2587
	return sprintf(buf, "%pU\n", dev_to_ns_head(dev)->ids.nguid);
2588
}
J
Joe Perches 已提交
2589
static DEVICE_ATTR_RO(nguid);
2590

2591
static ssize_t uuid_show(struct device *dev, struct device_attribute *attr,
2592
		char *buf)
2593
{
2594
	struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids;
2595 2596 2597 2598

	/* For backward compatibility expose the NGUID to userspace if
	 * we have no UUID set
	 */
2599
	if (uuid_is_null(&ids->uuid)) {
2600 2601
		printk_ratelimited(KERN_WARNING
				   "No UUID available providing old NGUID\n");
2602
		return sprintf(buf, "%pU\n", ids->nguid);
2603
	}
2604
	return sprintf(buf, "%pU\n", &ids->uuid);
2605
}
J
Joe Perches 已提交
2606
static DEVICE_ATTR_RO(uuid);
2607 2608

static ssize_t eui_show(struct device *dev, struct device_attribute *attr,
2609
		char *buf)
2610
{
2611
	return sprintf(buf, "%8ph\n", dev_to_ns_head(dev)->ids.eui64);
2612
}
J
Joe Perches 已提交
2613
static DEVICE_ATTR_RO(eui);
2614 2615

static ssize_t nsid_show(struct device *dev, struct device_attribute *attr,
2616
		char *buf)
2617
{
2618
	return sprintf(buf, "%d\n", dev_to_ns_head(dev)->ns_id);
2619
}
J
Joe Perches 已提交
2620
static DEVICE_ATTR_RO(nsid);
2621

2622
static struct attribute *nvme_ns_id_attrs[] = {
2623
	&dev_attr_wwid.attr,
2624
	&dev_attr_uuid.attr,
2625
	&dev_attr_nguid.attr,
2626 2627 2628 2629 2630
	&dev_attr_eui.attr,
	&dev_attr_nsid.attr,
	NULL,
};

2631
static umode_t nvme_ns_id_attrs_are_visible(struct kobject *kobj,
2632 2633 2634
		struct attribute *a, int n)
{
	struct device *dev = container_of(kobj, struct device, kobj);
2635
	struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids;
2636 2637

	if (a == &dev_attr_uuid.attr) {
2638
		if (uuid_is_null(&ids->uuid) &&
2639
		    !memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
2640 2641 2642
			return 0;
	}
	if (a == &dev_attr_nguid.attr) {
2643
		if (!memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
2644 2645 2646
			return 0;
	}
	if (a == &dev_attr_eui.attr) {
2647
		if (!memchr_inv(ids->eui64, 0, sizeof(ids->eui64)))
2648 2649 2650 2651 2652
			return 0;
	}
	return a->mode;
}

2653 2654 2655
const struct attribute_group nvme_ns_id_attr_group = {
	.attrs		= nvme_ns_id_attrs,
	.is_visible	= nvme_ns_id_attrs_are_visible,
2656 2657
};

M
Ming Lin 已提交
2658
#define nvme_show_str_function(field)						\
2659 2660 2661 2662
static ssize_t  field##_show(struct device *dev,				\
			    struct device_attribute *attr, char *buf)		\
{										\
        struct nvme_ctrl *ctrl = dev_get_drvdata(dev);				\
C
Christoph Hellwig 已提交
2663 2664
        return sprintf(buf, "%.*s\n",						\
		(int)sizeof(ctrl->subsys->field), ctrl->subsys->field);		\
2665 2666 2667
}										\
static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);

C
Christoph Hellwig 已提交
2668 2669 2670 2671
nvme_show_str_function(model);
nvme_show_str_function(serial);
nvme_show_str_function(firmware_rev);

M
Ming Lin 已提交
2672 2673 2674 2675 2676 2677 2678 2679 2680 2681
#define nvme_show_int_function(field)						\
static ssize_t  field##_show(struct device *dev,				\
			    struct device_attribute *attr, char *buf)		\
{										\
        struct nvme_ctrl *ctrl = dev_get_drvdata(dev);				\
        return sprintf(buf, "%d\n", ctrl->field);	\
}										\
static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);

nvme_show_int_function(cntlid);
2682

M
Ming Lin 已提交
2683 2684 2685 2686 2687 2688 2689
static ssize_t nvme_sysfs_delete(struct device *dev,
				struct device_attribute *attr, const char *buf,
				size_t count)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);

	if (device_remove_file_self(dev, attr))
2690
		nvme_delete_ctrl_sync(ctrl);
M
Ming Lin 已提交
2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704
	return count;
}
static DEVICE_ATTR(delete_controller, S_IWUSR, NULL, nvme_sysfs_delete);

static ssize_t nvme_sysfs_show_transport(struct device *dev,
					 struct device_attribute *attr,
					 char *buf)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->ops->name);
}
static DEVICE_ATTR(transport, S_IRUGO, nvme_sysfs_show_transport, NULL);

2705 2706 2707 2708 2709 2710 2711 2712
static ssize_t nvme_sysfs_show_state(struct device *dev,
				     struct device_attribute *attr,
				     char *buf)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
	static const char *const state_name[] = {
		[NVME_CTRL_NEW]		= "new",
		[NVME_CTRL_LIVE]	= "live",
2713
		[NVME_CTRL_ADMIN_ONLY]	= "only-admin",
2714
		[NVME_CTRL_RESETTING]	= "resetting",
2715
		[NVME_CTRL_CONNECTING]	= "connecting",
2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728
		[NVME_CTRL_DELETING]	= "deleting",
		[NVME_CTRL_DEAD]	= "dead",
	};

	if ((unsigned)ctrl->state < ARRAY_SIZE(state_name) &&
	    state_name[ctrl->state])
		return sprintf(buf, "%s\n", state_name[ctrl->state]);

	return sprintf(buf, "unknown state\n");
}

static DEVICE_ATTR(state, S_IRUGO, nvme_sysfs_show_state, NULL);

M
Ming Lin 已提交
2729 2730 2731 2732 2733 2734
static ssize_t nvme_sysfs_show_subsysnqn(struct device *dev,
					 struct device_attribute *attr,
					 char *buf)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);

C
Christoph Hellwig 已提交
2735
	return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->subsys->subnqn);
M
Ming Lin 已提交
2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748
}
static DEVICE_ATTR(subsysnqn, S_IRUGO, nvme_sysfs_show_subsysnqn, NULL);

static ssize_t nvme_sysfs_show_address(struct device *dev,
					 struct device_attribute *attr,
					 char *buf)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);

	return ctrl->ops->get_address(ctrl, buf, PAGE_SIZE);
}
static DEVICE_ATTR(address, S_IRUGO, nvme_sysfs_show_address, NULL);

2749 2750
static struct attribute *nvme_dev_attrs[] = {
	&dev_attr_reset_controller.attr,
K
Keith Busch 已提交
2751
	&dev_attr_rescan_controller.attr,
2752 2753 2754
	&dev_attr_model.attr,
	&dev_attr_serial.attr,
	&dev_attr_firmware_rev.attr,
M
Ming Lin 已提交
2755
	&dev_attr_cntlid.attr,
M
Ming Lin 已提交
2756 2757 2758 2759
	&dev_attr_delete_controller.attr,
	&dev_attr_transport.attr,
	&dev_attr_subsysnqn.attr,
	&dev_attr_address.attr,
2760
	&dev_attr_state.attr,
2761 2762 2763
	NULL
};

M
Ming Lin 已提交
2764 2765 2766 2767 2768 2769
static umode_t nvme_dev_attrs_are_visible(struct kobject *kobj,
		struct attribute *a, int n)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);

2770 2771 2772 2773
	if (a == &dev_attr_delete_controller.attr && !ctrl->ops->delete_ctrl)
		return 0;
	if (a == &dev_attr_address.attr && !ctrl->ops->get_address)
		return 0;
M
Ming Lin 已提交
2774 2775 2776 2777

	return a->mode;
}

2778
static struct attribute_group nvme_dev_attrs_group = {
M
Ming Lin 已提交
2779 2780
	.attrs		= nvme_dev_attrs,
	.is_visible	= nvme_dev_attrs_are_visible,
2781 2782 2783 2784 2785 2786 2787
};

static const struct attribute_group *nvme_dev_attr_groups[] = {
	&nvme_dev_attrs_group,
	NULL,
};

C
Christoph Hellwig 已提交
2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811
static struct nvme_ns_head *__nvme_find_ns_head(struct nvme_subsystem *subsys,
		unsigned nsid)
{
	struct nvme_ns_head *h;

	lockdep_assert_held(&subsys->lock);

	list_for_each_entry(h, &subsys->nsheads, entry) {
		if (h->ns_id == nsid && kref_get_unless_zero(&h->ref))
			return h;
	}

	return NULL;
}

static int __nvme_check_ids(struct nvme_subsystem *subsys,
		struct nvme_ns_head *new)
{
	struct nvme_ns_head *h;

	lockdep_assert_held(&subsys->lock);

	list_for_each_entry(h, &subsys->nsheads, entry) {
		if (nvme_ns_ids_valid(&new->ids) &&
2812
		    !list_empty(&h->list) &&
C
Christoph Hellwig 已提交
2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847
		    nvme_ns_ids_equal(&new->ids, &h->ids))
			return -EINVAL;
	}

	return 0;
}

static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl,
		unsigned nsid, struct nvme_id_ns *id)
{
	struct nvme_ns_head *head;
	int ret = -ENOMEM;

	head = kzalloc(sizeof(*head), GFP_KERNEL);
	if (!head)
		goto out;
	ret = ida_simple_get(&ctrl->subsys->ns_ida, 1, 0, GFP_KERNEL);
	if (ret < 0)
		goto out_free_head;
	head->instance = ret;
	INIT_LIST_HEAD(&head->list);
	init_srcu_struct(&head->srcu);
	head->subsys = ctrl->subsys;
	head->ns_id = nsid;
	kref_init(&head->ref);

	nvme_report_ns_ids(ctrl, nsid, id, &head->ids);

	ret = __nvme_check_ids(ctrl->subsys, head);
	if (ret) {
		dev_err(ctrl->device,
			"duplicate IDs for nsid %d\n", nsid);
		goto out_cleanup_srcu;
	}

2848 2849 2850 2851
	ret = nvme_mpath_alloc_disk(ctrl, head);
	if (ret)
		goto out_cleanup_srcu;

C
Christoph Hellwig 已提交
2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863
	list_add_tail(&head->entry, &ctrl->subsys->nsheads);
	return head;
out_cleanup_srcu:
	cleanup_srcu_struct(&head->srcu);
	ida_simple_remove(&ctrl->subsys->ns_ida, head->instance);
out_free_head:
	kfree(head);
out:
	return ERR_PTR(ret);
}

static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid,
2864
		struct nvme_id_ns *id)
C
Christoph Hellwig 已提交
2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900
{
	struct nvme_ctrl *ctrl = ns->ctrl;
	bool is_shared = id->nmic & (1 << 0);
	struct nvme_ns_head *head = NULL;
	int ret = 0;

	mutex_lock(&ctrl->subsys->lock);
	if (is_shared)
		head = __nvme_find_ns_head(ctrl->subsys, nsid);
	if (!head) {
		head = nvme_alloc_ns_head(ctrl, nsid, id);
		if (IS_ERR(head)) {
			ret = PTR_ERR(head);
			goto out_unlock;
		}
	} else {
		struct nvme_ns_ids ids;

		nvme_report_ns_ids(ctrl, nsid, id, &ids);
		if (!nvme_ns_ids_equal(&head->ids, &ids)) {
			dev_err(ctrl->device,
				"IDs don't match for shared namespace %d\n",
					nsid);
			ret = -EINVAL;
			goto out_unlock;
		}
	}

	list_add_tail(&ns->siblings, &head->list);
	ns->head = head;

out_unlock:
	mutex_unlock(&ctrl->subsys->lock);
	return ret;
}

2901 2902 2903 2904 2905
static int ns_cmp(void *priv, struct list_head *a, struct list_head *b)
{
	struct nvme_ns *nsa = container_of(a, struct nvme_ns, list);
	struct nvme_ns *nsb = container_of(b, struct nvme_ns, list);

C
Christoph Hellwig 已提交
2906
	return nsa->head->ns_id - nsb->head->ns_id;
2907 2908
}

2909
static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid)
2910
{
2911
	struct nvme_ns *ns, *ret = NULL;
2912

2913
	down_read(&ctrl->namespaces_rwsem);
2914
	list_for_each_entry(ns, &ctrl->namespaces, list) {
C
Christoph Hellwig 已提交
2915
		if (ns->head->ns_id == nsid) {
2916 2917
			if (!kref_get_unless_zero(&ns->kref))
				continue;
2918 2919 2920
			ret = ns;
			break;
		}
C
Christoph Hellwig 已提交
2921
		if (ns->head->ns_id > nsid)
2922 2923
			break;
	}
2924
	up_read(&ctrl->namespaces_rwsem);
2925
	return ret;
2926 2927
}

2928 2929 2930 2931 2932 2933 2934 2935
static int nvme_setup_streams_ns(struct nvme_ctrl *ctrl, struct nvme_ns *ns)
{
	struct streams_directive_params s;
	int ret;

	if (!ctrl->nr_streams)
		return 0;

C
Christoph Hellwig 已提交
2936
	ret = nvme_get_stream_params(ctrl, &s, ns->head->ns_id);
2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953
	if (ret)
		return ret;

	ns->sws = le32_to_cpu(s.sws);
	ns->sgs = le16_to_cpu(s.sgs);

	if (ns->sws) {
		unsigned int bs = 1 << ns->lba_shift;

		blk_queue_io_min(ns->queue, bs * ns->sws);
		if (ns->sgs)
			blk_queue_io_opt(ns->queue, bs * ns->sws * ns->sgs);
	}

	return 0;
}

2954 2955 2956 2957
static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
{
	struct nvme_ns *ns;
	struct gendisk *disk;
2958 2959
	struct nvme_id_ns *id;
	char disk_name[DISK_NAME_LEN];
2960
	int node = dev_to_node(ctrl->dev), flags = GENHD_FL_EXT_DEVT;
2961 2962 2963 2964 2965 2966 2967

	ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node);
	if (!ns)
		return;

	ns->queue = blk_mq_init_queue(ctrl->tagset);
	if (IS_ERR(ns->queue))
C
Christoph Hellwig 已提交
2968
		goto out_free_ns;
2969
	blk_queue_flag_set(QUEUE_FLAG_NONROT, ns->queue);
2970 2971 2972 2973 2974 2975 2976
	ns->queue->queuedata = ns;
	ns->ctrl = ctrl;

	kref_init(&ns->kref);
	ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */

	blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
2977
	nvme_set_queue_limits(ctrl, ns->queue);
2978

2979 2980
	id = nvme_identify_ns(ctrl, nsid);
	if (!id)
2981 2982
		goto out_free_queue;

2983 2984 2985
	if (id->ncap == 0)
		goto out_free_id;

2986
	if (nvme_init_ns_head(ns, nsid, id))
C
Christoph Hellwig 已提交
2987
		goto out_free_id;
2988
	nvme_setup_streams_ns(ctrl, ns);
C
Christoph Hellwig 已提交
2989
	
2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011
#ifdef CONFIG_NVME_MULTIPATH
	/*
	 * If multipathing is enabled we need to always use the subsystem
	 * instance number for numbering our devices to avoid conflicts
	 * between subsystems that have multiple controllers and thus use
	 * the multipath-aware subsystem node and those that have a single
	 * controller and use the controller node directly.
	 */
	if (ns->head->disk) {
		sprintf(disk_name, "nvme%dc%dn%d", ctrl->subsys->instance,
				ctrl->cntlid, ns->head->instance);
		flags = GENHD_FL_HIDDEN;
	} else {
		sprintf(disk_name, "nvme%dn%d", ctrl->subsys->instance,
				ns->head->instance);
	}
#else
	/*
	 * But without the multipath code enabled, multiple controller per
	 * subsystems are visible as devices and thus we cannot use the
	 * subsystem instance.
	 */
C
Christoph Hellwig 已提交
3012
	sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->head->instance);
3013
#endif
3014

C
Christoph Hellwig 已提交
3015 3016 3017
	if ((ctrl->quirks & NVME_QUIRK_LIGHTNVM) && id->vs[0] == 0x1) {
		if (nvme_nvm_register(ns, disk_name, node)) {
			dev_warn(ctrl->device, "LightNVM init failure\n");
C
Christoph Hellwig 已提交
3018
			goto out_unlink_ns;
C
Christoph Hellwig 已提交
3019
		}
3020
	}
3021

3022 3023
	disk = alloc_disk_node(0, node);
	if (!disk)
C
Christoph Hellwig 已提交
3024
		goto out_unlink_ns;
3025

3026 3027 3028
	disk->fops = &nvme_fops;
	disk->private_data = ns;
	disk->queue = ns->queue;
3029
	disk->flags = flags;
3030 3031 3032 3033
	memcpy(disk->disk_name, disk_name, DISK_NAME_LEN);
	ns->disk = disk;

	__nvme_revalidate_disk(disk, id);
3034

3035
	down_write(&ctrl->namespaces_rwsem);
3036
	list_add_tail(&ns->list, &ctrl->namespaces);
3037
	up_write(&ctrl->namespaces_rwsem);
3038

3039
	nvme_get_ctrl(ctrl);
3040 3041 3042

	kfree(id);

3043
	device_add_disk(ctrl->device, ns->disk);
3044
	if (sysfs_create_group(&disk_to_dev(ns->disk)->kobj,
3045
					&nvme_ns_id_attr_group))
3046 3047
		pr_warn("%s: failed to create sysfs group for identification\n",
			ns->disk->disk_name);
3048 3049 3050
	if (ns->ndev && nvme_nvm_register_sysfs(ns))
		pr_warn("%s: failed to register lightnvm sysfs group for identification\n",
			ns->disk->disk_name);
3051

3052
	nvme_mpath_add_disk(ns->head);
3053
	nvme_mpath_add_disk_links(ns);
T
Thomas Tai 已提交
3054
	nvme_fault_inject_init(ns);
3055
	return;
C
Christoph Hellwig 已提交
3056 3057 3058 3059
 out_unlink_ns:
	mutex_lock(&ctrl->subsys->lock);
	list_del_rcu(&ns->siblings);
	mutex_unlock(&ctrl->subsys->lock);
3060 3061
 out_free_id:
	kfree(id);
3062 3063 3064 3065 3066 3067 3068 3069
 out_free_queue:
	blk_cleanup_queue(ns->queue);
 out_free_ns:
	kfree(ns);
}

static void nvme_ns_remove(struct nvme_ns *ns)
{
3070 3071
	if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags))
		return;
3072

T
Thomas Tai 已提交
3073
	nvme_fault_inject_fini(ns);
3074
	if (ns->disk && ns->disk->flags & GENHD_FL_UP) {
3075
		nvme_mpath_remove_disk_links(ns);
3076
		sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
3077
					&nvme_ns_id_attr_group);
3078 3079
		if (ns->ndev)
			nvme_nvm_unregister_sysfs(ns);
3080 3081
		del_gendisk(ns->disk);
		blk_cleanup_queue(ns->queue);
3082 3083
		if (blk_get_integrity(ns->disk))
			blk_integrity_unregister(ns->disk);
3084
	}
3085

C
Christoph Hellwig 已提交
3086
	mutex_lock(&ns->ctrl->subsys->lock);
3087
	nvme_mpath_clear_current_path(ns);
3088
	list_del_rcu(&ns->siblings);
C
Christoph Hellwig 已提交
3089 3090
	mutex_unlock(&ns->ctrl->subsys->lock);

3091
	down_write(&ns->ctrl->namespaces_rwsem);
3092
	list_del_init(&ns->list);
3093
	up_write(&ns->ctrl->namespaces_rwsem);
3094

3095
	synchronize_srcu(&ns->head->srcu);
3096
	nvme_mpath_check_last_path(ns);
3097 3098 3099
	nvme_put_ns(ns);
}

3100 3101 3102 3103
static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid)
{
	struct nvme_ns *ns;

3104
	ns = nvme_find_get_ns(ctrl, nsid);
3105
	if (ns) {
3106
		if (ns->disk && revalidate_disk(ns->disk))
3107
			nvme_ns_remove(ns);
3108
		nvme_put_ns(ns);
3109 3110 3111 3112
	} else
		nvme_alloc_ns(ctrl, nsid);
}

3113 3114 3115 3116
static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl,
					unsigned nsid)
{
	struct nvme_ns *ns, *next;
3117
	LIST_HEAD(rm_list);
3118

3119
	down_write(&ctrl->namespaces_rwsem);
3120
	list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) {
C
Christoph Hellwig 已提交
3121
		if (ns->head->ns_id > nsid)
3122
			list_move_tail(&ns->list, &rm_list);
3123
	}
3124
	up_write(&ctrl->namespaces_rwsem);
3125 3126 3127 3128

	list_for_each_entry_safe(ns, next, &rm_list, list)
		nvme_ns_remove(ns);

3129 3130
}

3131 3132 3133 3134 3135 3136 3137
static int nvme_scan_ns_list(struct nvme_ctrl *ctrl, unsigned nn)
{
	struct nvme_ns *ns;
	__le32 *ns_list;
	unsigned i, j, nsid, prev = 0, num_lists = DIV_ROUND_UP(nn, 1024);
	int ret = 0;

3138
	ns_list = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL);
3139 3140 3141 3142 3143 3144
	if (!ns_list)
		return -ENOMEM;

	for (i = 0; i < num_lists; i++) {
		ret = nvme_identify_ns_list(ctrl, prev, ns_list);
		if (ret)
3145
			goto free;
3146 3147 3148 3149 3150 3151 3152 3153 3154

		for (j = 0; j < min(nn, 1024U); j++) {
			nsid = le32_to_cpu(ns_list[j]);
			if (!nsid)
				goto out;

			nvme_validate_ns(ctrl, nsid);

			while (++prev < nsid) {
3155 3156
				ns = nvme_find_get_ns(ctrl, prev);
				if (ns) {
3157
					nvme_ns_remove(ns);
3158 3159
					nvme_put_ns(ns);
				}
3160 3161 3162 3163 3164
			}
		}
		nn -= j;
	}
 out:
3165 3166
	nvme_remove_invalid_namespaces(ctrl, prev);
 free:
3167 3168 3169 3170
	kfree(ns_list);
	return ret;
}

3171
static void nvme_scan_ns_sequential(struct nvme_ctrl *ctrl, unsigned nn)
3172 3173 3174
{
	unsigned i;

3175 3176 3177
	for (i = 1; i <= nn; i++)
		nvme_validate_ns(ctrl, i);

3178
	nvme_remove_invalid_namespaces(ctrl, nn);
3179 3180
}

3181
static void nvme_scan_work(struct work_struct *work)
3182
{
3183 3184
	struct nvme_ctrl *ctrl =
		container_of(work, struct nvme_ctrl, scan_work);
3185
	struct nvme_id_ctrl *id;
3186
	unsigned nn;
3187

3188 3189 3190
	if (ctrl->state != NVME_CTRL_LIVE)
		return;

3191 3192
	WARN_ON_ONCE(!ctrl->tagset);

3193 3194
	if (nvme_identify_ctrl(ctrl, &id))
		return;
3195 3196

	nn = le32_to_cpu(id->nn);
3197
	if (ctrl->vs >= NVME_VS(1, 1, 0) &&
3198 3199 3200 3201
	    !(ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)) {
		if (!nvme_scan_ns_list(ctrl, nn))
			goto done;
	}
3202
	nvme_scan_ns_sequential(ctrl, nn);
3203
 done:
3204
	down_write(&ctrl->namespaces_rwsem);
3205
	list_sort(NULL, &ctrl->namespaces, ns_cmp);
3206
	up_write(&ctrl->namespaces_rwsem);
3207 3208
	kfree(id);
}
3209 3210 3211 3212

void nvme_queue_scan(struct nvme_ctrl *ctrl)
{
	/*
3213
	 * Only new queue scan work when admin and IO queues are both alive
3214 3215
	 */
	if (ctrl->state == NVME_CTRL_LIVE)
3216
		queue_work(nvme_wq, &ctrl->scan_work);
3217 3218
}
EXPORT_SYMBOL_GPL(nvme_queue_scan);
3219

3220 3221 3222 3223 3224
/*
 * This function iterates the namespace list unlocked to allow recovery from
 * controller failure. It is up to the caller to ensure the namespace list is
 * not modified by scan work while this function is executing.
 */
3225 3226 3227
void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
{
	struct nvme_ns *ns, *next;
3228
	LIST_HEAD(ns_list);
3229

3230 3231 3232 3233 3234 3235 3236 3237 3238
	/*
	 * The dead states indicates the controller was not gracefully
	 * disconnected. In that case, we won't be able to flush any data while
	 * removing the namespaces' disks; fail all the queues now to avoid
	 * potentially having to clean up the failed sync later.
	 */
	if (ctrl->state == NVME_CTRL_DEAD)
		nvme_kill_queues(ctrl);

3239
	down_write(&ctrl->namespaces_rwsem);
3240
	list_splice_init(&ctrl->namespaces, &ns_list);
3241
	up_write(&ctrl->namespaces_rwsem);
3242 3243

	list_for_each_entry_safe(ns, next, &ns_list, list)
3244 3245
		nvme_ns_remove(ns);
}
3246
EXPORT_SYMBOL_GPL(nvme_remove_namespaces);
3247

3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263
static void nvme_aen_uevent(struct nvme_ctrl *ctrl)
{
	char *envp[2] = { NULL, NULL };
	u32 aen_result = ctrl->aen_result;

	ctrl->aen_result = 0;
	if (!aen_result)
		return;

	envp[0] = kasprintf(GFP_KERNEL, "NVME_AEN=%#08x", aen_result);
	if (!envp[0])
		return;
	kobject_uevent_env(&ctrl->device->kobj, KOBJ_CHANGE, envp);
	kfree(envp[0]);
}

3264 3265 3266 3267 3268
static void nvme_async_event_work(struct work_struct *work)
{
	struct nvme_ctrl *ctrl =
		container_of(work, struct nvme_ctrl, async_event_work);

3269
	nvme_aen_uevent(ctrl);
3270
	ctrl->ops->submit_async_event(ctrl);
3271 3272
}

3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294
static bool nvme_ctrl_pp_status(struct nvme_ctrl *ctrl)
{

	u32 csts;

	if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts))
		return false;

	if (csts == ~0)
		return false;

	return ((ctrl->ctrl_config & NVME_CC_ENABLE) && (csts & NVME_CSTS_PP));
}

static void nvme_get_fw_slot_info(struct nvme_ctrl *ctrl)
{
	struct nvme_fw_slot_info_log *log;

	log = kmalloc(sizeof(*log), GFP_KERNEL);
	if (!log)
		return;

K
Keith Busch 已提交
3295
	if (nvme_get_log(ctrl, NVME_LOG_FW_SLOT, log, sizeof(*log)))
3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328
		dev_warn(ctrl->device,
				"Get FW SLOT INFO log error\n");
	kfree(log);
}

static void nvme_fw_act_work(struct work_struct *work)
{
	struct nvme_ctrl *ctrl = container_of(work,
				struct nvme_ctrl, fw_act_work);
	unsigned long fw_act_timeout;

	if (ctrl->mtfa)
		fw_act_timeout = jiffies +
				msecs_to_jiffies(ctrl->mtfa * 100);
	else
		fw_act_timeout = jiffies +
				msecs_to_jiffies(admin_timeout * 1000);

	nvme_stop_queues(ctrl);
	while (nvme_ctrl_pp_status(ctrl)) {
		if (time_after(jiffies, fw_act_timeout)) {
			dev_warn(ctrl->device,
				"Fw activation timeout, reset controller\n");
			nvme_reset_ctrl(ctrl);
			break;
		}
		msleep(100);
	}

	if (ctrl->state != NVME_CTRL_LIVE)
		return;

	nvme_start_queues(ctrl);
3329
	/* read FW slot information to clear the AER */
3330 3331 3332
	nvme_get_fw_slot_info(ctrl);
}

3333 3334
void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
		union nvme_result *res)
3335
{
3336
	u32 result = le32_to_cpu(res->u32);
3337

3338
	if (le16_to_cpu(status) >> 1 != NVME_SC_SUCCESS)
3339 3340
		return;

3341 3342 3343 3344 3345 3346
	switch (result & 0x7) {
	case NVME_AER_ERROR:
	case NVME_AER_SMART:
	case NVME_AER_CSS:
	case NVME_AER_VS:
		ctrl->aen_result = result;
3347 3348 3349
		break;
	default:
		break;
3350 3351 3352 3353 3354 3355 3356
	}

	switch (result & 0xff07) {
	case NVME_AER_NOTICE_NS_CHANGED:
		dev_info(ctrl->device, "rescanning\n");
		nvme_queue_scan(ctrl);
		break;
3357
	case NVME_AER_NOTICE_FW_ACT_STARTING:
3358
		queue_work(nvme_wq, &ctrl->fw_act_work);
3359
		break;
3360 3361 3362
	default:
		dev_warn(ctrl->device, "async event result %08x\n", result);
	}
3363
	queue_work(nvme_wq, &ctrl->async_event_work);
3364 3365
}
EXPORT_SYMBOL_GPL(nvme_complete_async_event);
3366

3367
void nvme_stop_ctrl(struct nvme_ctrl *ctrl)
3368
{
3369
	nvme_stop_keep_alive(ctrl);
3370
	flush_work(&ctrl->async_event_work);
3371
	flush_work(&ctrl->scan_work);
3372
	cancel_work_sync(&ctrl->fw_act_work);
3373 3374 3375 3376 3377 3378 3379 3380 3381 3382
}
EXPORT_SYMBOL_GPL(nvme_stop_ctrl);

void nvme_start_ctrl(struct nvme_ctrl *ctrl)
{
	if (ctrl->kato)
		nvme_start_keep_alive(ctrl);

	if (ctrl->queue_count > 1) {
		nvme_queue_scan(ctrl);
3383
		queue_work(nvme_wq, &ctrl->async_event_work);
3384 3385 3386 3387
		nvme_start_queues(ctrl);
	}
}
EXPORT_SYMBOL_GPL(nvme_start_ctrl);
3388

3389 3390
void nvme_uninit_ctrl(struct nvme_ctrl *ctrl)
{
3391
	cdev_device_del(&ctrl->cdev, ctrl->device);
3392
}
3393
EXPORT_SYMBOL_GPL(nvme_uninit_ctrl);
3394

3395
static void nvme_free_ctrl(struct device *dev)
3396
{
3397 3398
	struct nvme_ctrl *ctrl =
		container_of(dev, struct nvme_ctrl, ctrl_device);
C
Christoph Hellwig 已提交
3399
	struct nvme_subsystem *subsys = ctrl->subsys;
3400

3401
	ida_simple_remove(&nvme_instance_ida, ctrl->instance);
3402
	kfree(ctrl->effects);
3403

C
Christoph Hellwig 已提交
3404 3405 3406 3407 3408 3409
	if (subsys) {
		mutex_lock(&subsys->lock);
		list_del(&ctrl->subsys_entry);
		mutex_unlock(&subsys->lock);
		sysfs_remove_link(&subsys->dev.kobj, dev_name(ctrl->device));
	}
3410 3411 3412

	ctrl->ops->free_ctrl(ctrl);

C
Christoph Hellwig 已提交
3413 3414
	if (subsys)
		nvme_put_subsystem(subsys);
3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426
}

/*
 * Initialize a NVMe controller structures.  This needs to be called during
 * earliest initialization so that we have the initialized structured around
 * during probing.
 */
int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
		const struct nvme_ctrl_ops *ops, unsigned long quirks)
{
	int ret;

3427 3428
	ctrl->state = NVME_CTRL_NEW;
	spin_lock_init(&ctrl->lock);
3429
	INIT_LIST_HEAD(&ctrl->namespaces);
3430
	init_rwsem(&ctrl->namespaces_rwsem);
3431 3432 3433
	ctrl->dev = dev;
	ctrl->ops = ops;
	ctrl->quirks = quirks;
3434
	INIT_WORK(&ctrl->scan_work, nvme_scan_work);
3435
	INIT_WORK(&ctrl->async_event_work, nvme_async_event_work);
3436
	INIT_WORK(&ctrl->fw_act_work, nvme_fw_act_work);
3437
	INIT_WORK(&ctrl->delete_work, nvme_delete_ctrl_work);
3438

3439 3440
	ret = ida_simple_get(&nvme_instance_ida, 0, 0, GFP_KERNEL);
	if (ret < 0)
3441
		goto out;
3442
	ctrl->instance = ret;
3443

3444 3445
	device_initialize(&ctrl->ctrl_device);
	ctrl->device = &ctrl->ctrl_device;
3446
	ctrl->device->devt = MKDEV(MAJOR(nvme_chr_devt), ctrl->instance);
3447 3448 3449 3450 3451 3452 3453
	ctrl->device->class = nvme_class;
	ctrl->device->parent = ctrl->dev;
	ctrl->device->groups = nvme_dev_attr_groups;
	ctrl->device->release = nvme_free_ctrl;
	dev_set_drvdata(ctrl->device, ctrl);
	ret = dev_set_name(ctrl->device, "nvme%d", ctrl->instance);
	if (ret)
3454 3455
		goto out_release_instance;

3456 3457 3458
	cdev_init(&ctrl->cdev, &nvme_dev_fops);
	ctrl->cdev.owner = ops->module;
	ret = cdev_device_add(&ctrl->cdev, ctrl->device);
3459 3460
	if (ret)
		goto out_free_name;
3461

3462 3463 3464 3465 3466 3467 3468 3469
	/*
	 * Initialize latency tolerance controls.  The sysfs files won't
	 * be visible to userspace unless the device actually supports APST.
	 */
	ctrl->device->power.set_latency_tolerance = nvme_set_latency_tolerance;
	dev_pm_qos_update_user_latency_tolerance(ctrl->device,
		min(default_ps_max_latency_us, (unsigned long)S32_MAX));

3470
	return 0;
3471 3472
out_free_name:
	kfree_const(dev->kobj.name);
3473
out_release_instance:
3474
	ida_simple_remove(&nvme_instance_ida, ctrl->instance);
3475 3476 3477
out:
	return ret;
}
3478
EXPORT_SYMBOL_GPL(nvme_init_ctrl);
3479

3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490
/**
 * nvme_kill_queues(): Ends all namespace queues
 * @ctrl: the dead controller that needs to end
 *
 * Call this function when the driver determines it is unable to get the
 * controller in a state capable of servicing IO.
 */
void nvme_kill_queues(struct nvme_ctrl *ctrl)
{
	struct nvme_ns *ns;

3491
	down_read(&ctrl->namespaces_rwsem);
M
Ming Lei 已提交
3492

3493
	/* Forcibly unquiesce queues to avoid blocking dispatch */
3494 3495
	if (ctrl->admin_q)
		blk_mq_unquiesce_queue(ctrl->admin_q);
3496

3497
	list_for_each_entry(ns, &ctrl->namespaces, list) {
3498 3499 3500 3501
		/*
		 * Revalidating a dead namespace sets capacity to 0. This will
		 * end buffered writers dirtying pages that can't be synced.
		 */
3502 3503 3504
		if (!ns->disk || test_and_set_bit(NVME_NS_DEAD, &ns->flags))
			continue;
		revalidate_disk(ns->disk);
3505
		blk_set_queue_dying(ns->queue);
3506

3507 3508
		/* Forcibly unquiesce queues to avoid blocking dispatch */
		blk_mq_unquiesce_queue(ns->queue);
3509
	}
3510
	up_read(&ctrl->namespaces_rwsem);
3511
}
3512
EXPORT_SYMBOL_GPL(nvme_kill_queues);
3513

K
Keith Busch 已提交
3514 3515 3516 3517
void nvme_unfreeze(struct nvme_ctrl *ctrl)
{
	struct nvme_ns *ns;

3518
	down_read(&ctrl->namespaces_rwsem);
K
Keith Busch 已提交
3519 3520
	list_for_each_entry(ns, &ctrl->namespaces, list)
		blk_mq_unfreeze_queue(ns->queue);
3521
	up_read(&ctrl->namespaces_rwsem);
K
Keith Busch 已提交
3522 3523 3524 3525 3526 3527 3528
}
EXPORT_SYMBOL_GPL(nvme_unfreeze);

void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout)
{
	struct nvme_ns *ns;

3529
	down_read(&ctrl->namespaces_rwsem);
K
Keith Busch 已提交
3530 3531 3532 3533 3534
	list_for_each_entry(ns, &ctrl->namespaces, list) {
		timeout = blk_mq_freeze_queue_wait_timeout(ns->queue, timeout);
		if (timeout <= 0)
			break;
	}
3535
	up_read(&ctrl->namespaces_rwsem);
K
Keith Busch 已提交
3536 3537 3538 3539 3540 3541 3542
}
EXPORT_SYMBOL_GPL(nvme_wait_freeze_timeout);

void nvme_wait_freeze(struct nvme_ctrl *ctrl)
{
	struct nvme_ns *ns;

3543
	down_read(&ctrl->namespaces_rwsem);
K
Keith Busch 已提交
3544 3545
	list_for_each_entry(ns, &ctrl->namespaces, list)
		blk_mq_freeze_queue_wait(ns->queue);
3546
	up_read(&ctrl->namespaces_rwsem);
K
Keith Busch 已提交
3547 3548 3549 3550 3551 3552 3553
}
EXPORT_SYMBOL_GPL(nvme_wait_freeze);

void nvme_start_freeze(struct nvme_ctrl *ctrl)
{
	struct nvme_ns *ns;

3554
	down_read(&ctrl->namespaces_rwsem);
K
Keith Busch 已提交
3555
	list_for_each_entry(ns, &ctrl->namespaces, list)
3556
		blk_freeze_queue_start(ns->queue);
3557
	up_read(&ctrl->namespaces_rwsem);
K
Keith Busch 已提交
3558 3559 3560
}
EXPORT_SYMBOL_GPL(nvme_start_freeze);

3561
void nvme_stop_queues(struct nvme_ctrl *ctrl)
3562 3563 3564
{
	struct nvme_ns *ns;

3565
	down_read(&ctrl->namespaces_rwsem);
3566
	list_for_each_entry(ns, &ctrl->namespaces, list)
3567
		blk_mq_quiesce_queue(ns->queue);
3568
	up_read(&ctrl->namespaces_rwsem);
3569
}
3570
EXPORT_SYMBOL_GPL(nvme_stop_queues);
3571

3572
void nvme_start_queues(struct nvme_ctrl *ctrl)
3573 3574 3575
{
	struct nvme_ns *ns;

3576
	down_read(&ctrl->namespaces_rwsem);
3577
	list_for_each_entry(ns, &ctrl->namespaces, list)
3578
		blk_mq_unquiesce_queue(ns->queue);
3579
	up_read(&ctrl->namespaces_rwsem);
3580
}
3581
EXPORT_SYMBOL_GPL(nvme_start_queues);
3582

S
Sagi Grimberg 已提交
3583 3584 3585 3586 3587 3588 3589 3590 3591 3592
int nvme_reinit_tagset(struct nvme_ctrl *ctrl, struct blk_mq_tag_set *set)
{
	if (!ctrl->ops->reinit_request)
		return 0;

	return blk_mq_tagset_iter(set, set->driver_data,
			ctrl->ops->reinit_request);
}
EXPORT_SYMBOL_GPL(nvme_reinit_tagset);

3593 3594
int __init nvme_core_init(void)
{
3595
	int result = -ENOMEM;
3596

3597 3598 3599
	nvme_wq = alloc_workqueue("nvme-wq",
			WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
	if (!nvme_wq)
3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610
		goto out;

	nvme_reset_wq = alloc_workqueue("nvme-reset-wq",
			WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
	if (!nvme_reset_wq)
		goto destroy_wq;

	nvme_delete_wq = alloc_workqueue("nvme-delete-wq",
			WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
	if (!nvme_delete_wq)
		goto destroy_reset_wq;
3611

3612
	result = alloc_chrdev_region(&nvme_chr_devt, 0, NVME_MINORS, "nvme");
3613
	if (result < 0)
3614
		goto destroy_delete_wq;
3615 3616 3617 3618 3619 3620 3621

	nvme_class = class_create(THIS_MODULE, "nvme");
	if (IS_ERR(nvme_class)) {
		result = PTR_ERR(nvme_class);
		goto unregister_chrdev;
	}

C
Christoph Hellwig 已提交
3622 3623 3624 3625 3626
	nvme_subsys_class = class_create(THIS_MODULE, "nvme-subsystem");
	if (IS_ERR(nvme_subsys_class)) {
		result = PTR_ERR(nvme_subsys_class);
		goto destroy_class;
	}
3627
	return 0;
3628

C
Christoph Hellwig 已提交
3629 3630
destroy_class:
	class_destroy(nvme_class);
3631
unregister_chrdev:
3632
	unregister_chrdev_region(nvme_chr_devt, NVME_MINORS);
3633 3634 3635 3636
destroy_delete_wq:
	destroy_workqueue(nvme_delete_wq);
destroy_reset_wq:
	destroy_workqueue(nvme_reset_wq);
3637 3638
destroy_wq:
	destroy_workqueue(nvme_wq);
3639
out:
3640
	return result;
3641 3642 3643 3644
}

void nvme_core_exit(void)
{
C
Christoph Hellwig 已提交
3645 3646
	ida_destroy(&nvme_subsystems_ida);
	class_destroy(nvme_subsys_class);
3647
	class_destroy(nvme_class);
3648
	unregister_chrdev_region(nvme_chr_devt, NVME_MINORS);
3649 3650
	destroy_workqueue(nvme_delete_wq);
	destroy_workqueue(nvme_reset_wq);
3651
	destroy_workqueue(nvme_wq);
3652
}
3653 3654 3655 3656 3657

MODULE_LICENSE("GPL");
MODULE_VERSION("1.0");
module_init(nvme_core_init);
module_exit(nvme_core_exit);