2 * NVM Express device driver
3 * Copyright (c) 2011-2014, Intel Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 #include <linux/blkdev.h>
16 #include <linux/blk-mq.h>
17 #include <linux/delay.h>
18 #include <linux/errno.h>
19 #include <linux/hdreg.h>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/list_sort.h>
23 #include <linux/slab.h>
24 #include <linux/types.h>
26 #include <linux/ptrace.h>
27 #include <linux/nvme_ioctl.h>
28 #include <linux/t10-pi.h>
30 #include <asm/unaligned.h>
34 #define NVME_MINORS (1U << MINORBITS)
36 static int nvme_major
;
37 module_param(nvme_major
, int, 0);
39 static int nvme_char_major
;
40 module_param(nvme_char_major
, int, 0);
42 static LIST_HEAD(nvme_ctrl_list
);
43 DEFINE_SPINLOCK(dev_list_lock
);
45 static struct class *nvme_class
;
47 static void nvme_free_ns(struct kref
*kref
)
49 struct nvme_ns
*ns
= container_of(kref
, struct nvme_ns
, kref
);
51 if (ns
->type
== NVME_NS_LIGHTNVM
)
52 nvme_nvm_unregister(ns
->queue
, ns
->disk
->disk_name
);
54 spin_lock(&dev_list_lock
);
55 ns
->disk
->private_data
= NULL
;
56 spin_unlock(&dev_list_lock
);
58 nvme_put_ctrl(ns
->ctrl
);
63 static void nvme_put_ns(struct nvme_ns
*ns
)
65 kref_put(&ns
->kref
, nvme_free_ns
);
68 static struct nvme_ns
*nvme_get_ns_from_disk(struct gendisk
*disk
)
72 spin_lock(&dev_list_lock
);
73 ns
= disk
->private_data
;
74 if (ns
&& !kref_get_unless_zero(&ns
->kref
))
76 spin_unlock(&dev_list_lock
);
81 struct request
*nvme_alloc_request(struct request_queue
*q
,
82 struct nvme_command
*cmd
, unsigned int flags
)
84 bool write
= cmd
->common
.opcode
& 1;
87 req
= blk_mq_alloc_request(q
, write
, flags
);
91 req
->cmd_type
= REQ_TYPE_DRV_PRIV
;
92 req
->cmd_flags
|= REQ_FAILFAST_DRIVER
;
94 req
->__sector
= (sector_t
) -1;
95 req
->bio
= req
->biotail
= NULL
;
97 req
->cmd
= (unsigned char *)cmd
;
98 req
->cmd_len
= sizeof(struct nvme_command
);
99 req
->special
= (void *)0;
105 * Returns 0 on success. If the result is negative, it's a Linux error code;
106 * if the result is positive, it's an NVM Express status code
108 int __nvme_submit_sync_cmd(struct request_queue
*q
, struct nvme_command
*cmd
,
109 void *buffer
, unsigned bufflen
, u32
*result
, unsigned timeout
)
114 req
= nvme_alloc_request(q
, cmd
, 0);
118 req
->timeout
= timeout
? timeout
: ADMIN_TIMEOUT
;
120 if (buffer
&& bufflen
) {
121 ret
= blk_rq_map_kern(q
, req
, buffer
, bufflen
, GFP_KERNEL
);
126 blk_execute_rq(req
->q
, NULL
, req
, 0);
128 *result
= (u32
)(uintptr_t)req
->special
;
131 blk_mq_free_request(req
);
135 int nvme_submit_sync_cmd(struct request_queue
*q
, struct nvme_command
*cmd
,
136 void *buffer
, unsigned bufflen
)
138 return __nvme_submit_sync_cmd(q
, cmd
, buffer
, bufflen
, NULL
, 0);
141 int __nvme_submit_user_cmd(struct request_queue
*q
, struct nvme_command
*cmd
,
142 void __user
*ubuffer
, unsigned bufflen
,
143 void __user
*meta_buffer
, unsigned meta_len
, u32 meta_seed
,
144 u32
*result
, unsigned timeout
)
146 bool write
= cmd
->common
.opcode
& 1;
147 struct nvme_ns
*ns
= q
->queuedata
;
148 struct gendisk
*disk
= ns
? ns
->disk
: NULL
;
150 struct bio
*bio
= NULL
;
154 req
= nvme_alloc_request(q
, cmd
, 0);
158 req
->timeout
= timeout
? timeout
: ADMIN_TIMEOUT
;
160 if (ubuffer
&& bufflen
) {
161 ret
= blk_rq_map_user(q
, req
, NULL
, ubuffer
, bufflen
,
169 bio
->bi_bdev
= bdget_disk(disk
, 0);
176 struct bio_integrity_payload
*bip
;
178 meta
= kmalloc(meta_len
, GFP_KERNEL
);
185 if (copy_from_user(meta
, meta_buffer
,
192 bip
= bio_integrity_alloc(bio
, GFP_KERNEL
, 1);
198 bip
->bip_iter
.bi_size
= meta_len
;
199 bip
->bip_iter
.bi_sector
= meta_seed
;
201 ret
= bio_integrity_add_page(bio
, virt_to_page(meta
),
202 meta_len
, offset_in_page(meta
));
203 if (ret
!= meta_len
) {
210 blk_execute_rq(req
->q
, disk
, req
, 0);
213 *result
= (u32
)(uintptr_t)req
->special
;
214 if (meta
&& !ret
&& !write
) {
215 if (copy_to_user(meta_buffer
, meta
, meta_len
))
222 if (disk
&& bio
->bi_bdev
)
224 blk_rq_unmap_user(bio
);
227 blk_mq_free_request(req
);
231 int nvme_submit_user_cmd(struct request_queue
*q
, struct nvme_command
*cmd
,
232 void __user
*ubuffer
, unsigned bufflen
, u32
*result
,
235 return __nvme_submit_user_cmd(q
, cmd
, ubuffer
, bufflen
, NULL
, 0, 0,
239 int nvme_identify_ctrl(struct nvme_ctrl
*dev
, struct nvme_id_ctrl
**id
)
241 struct nvme_command c
= { };
244 /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
245 c
.identify
.opcode
= nvme_admin_identify
;
246 c
.identify
.cns
= cpu_to_le32(1);
248 *id
= kmalloc(sizeof(struct nvme_id_ctrl
), GFP_KERNEL
);
252 error
= nvme_submit_sync_cmd(dev
->admin_q
, &c
, *id
,
253 sizeof(struct nvme_id_ctrl
));
259 int nvme_identify_ns(struct nvme_ctrl
*dev
, unsigned nsid
,
260 struct nvme_id_ns
**id
)
262 struct nvme_command c
= { };
265 /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
266 c
.identify
.opcode
= nvme_admin_identify
,
267 c
.identify
.nsid
= cpu_to_le32(nsid
),
269 *id
= kmalloc(sizeof(struct nvme_id_ns
), GFP_KERNEL
);
273 error
= nvme_submit_sync_cmd(dev
->admin_q
, &c
, *id
,
274 sizeof(struct nvme_id_ns
));
280 int nvme_get_features(struct nvme_ctrl
*dev
, unsigned fid
, unsigned nsid
,
281 dma_addr_t dma_addr
, u32
*result
)
283 struct nvme_command c
;
285 memset(&c
, 0, sizeof(c
));
286 c
.features
.opcode
= nvme_admin_get_features
;
287 c
.features
.nsid
= cpu_to_le32(nsid
);
288 c
.features
.prp1
= cpu_to_le64(dma_addr
);
289 c
.features
.fid
= cpu_to_le32(fid
);
291 return __nvme_submit_sync_cmd(dev
->admin_q
, &c
, NULL
, 0, result
, 0);
294 int nvme_set_features(struct nvme_ctrl
*dev
, unsigned fid
, unsigned dword11
,
295 dma_addr_t dma_addr
, u32
*result
)
297 struct nvme_command c
;
299 memset(&c
, 0, sizeof(c
));
300 c
.features
.opcode
= nvme_admin_set_features
;
301 c
.features
.prp1
= cpu_to_le64(dma_addr
);
302 c
.features
.fid
= cpu_to_le32(fid
);
303 c
.features
.dword11
= cpu_to_le32(dword11
);
305 return __nvme_submit_sync_cmd(dev
->admin_q
, &c
, NULL
, 0, result
, 0);
308 int nvme_get_log_page(struct nvme_ctrl
*dev
, struct nvme_smart_log
**log
)
310 struct nvme_command c
= { };
313 c
.common
.opcode
= nvme_admin_get_log_page
,
314 c
.common
.nsid
= cpu_to_le32(0xFFFFFFFF),
315 c
.common
.cdw10
[0] = cpu_to_le32(
316 (((sizeof(struct nvme_smart_log
) / 4) - 1) << 16) |
319 *log
= kmalloc(sizeof(struct nvme_smart_log
), GFP_KERNEL
);
323 error
= nvme_submit_sync_cmd(dev
->admin_q
, &c
, *log
,
324 sizeof(struct nvme_smart_log
));
330 int nvme_set_queue_count(struct nvme_ctrl
*ctrl
, int *count
)
332 u32 q_count
= (*count
- 1) | ((*count
- 1) << 16);
334 int status
, nr_io_queues
;
336 status
= nvme_set_features(ctrl
, NVME_FEAT_NUM_QUEUES
, q_count
, 0,
341 nr_io_queues
= min(result
& 0xffff, result
>> 16) + 1;
342 *count
= min(*count
, nr_io_queues
);
346 static int nvme_submit_io(struct nvme_ns
*ns
, struct nvme_user_io __user
*uio
)
348 struct nvme_user_io io
;
349 struct nvme_command c
;
350 unsigned length
, meta_len
;
351 void __user
*metadata
;
353 if (copy_from_user(&io
, uio
, sizeof(io
)))
359 case nvme_cmd_compare
:
365 length
= (io
.nblocks
+ 1) << ns
->lba_shift
;
366 meta_len
= (io
.nblocks
+ 1) * ns
->ms
;
367 metadata
= (void __user
*)(uintptr_t)io
.metadata
;
372 } else if (meta_len
) {
373 if ((io
.metadata
& 3) || !io
.metadata
)
377 memset(&c
, 0, sizeof(c
));
378 c
.rw
.opcode
= io
.opcode
;
379 c
.rw
.flags
= io
.flags
;
380 c
.rw
.nsid
= cpu_to_le32(ns
->ns_id
);
381 c
.rw
.slba
= cpu_to_le64(io
.slba
);
382 c
.rw
.length
= cpu_to_le16(io
.nblocks
);
383 c
.rw
.control
= cpu_to_le16(io
.control
);
384 c
.rw
.dsmgmt
= cpu_to_le32(io
.dsmgmt
);
385 c
.rw
.reftag
= cpu_to_le32(io
.reftag
);
386 c
.rw
.apptag
= cpu_to_le16(io
.apptag
);
387 c
.rw
.appmask
= cpu_to_le16(io
.appmask
);
389 return __nvme_submit_user_cmd(ns
->queue
, &c
,
390 (void __user
*)(uintptr_t)io
.addr
, length
,
391 metadata
, meta_len
, io
.slba
, NULL
, 0);
394 static int nvme_user_cmd(struct nvme_ctrl
*ctrl
, struct nvme_ns
*ns
,
395 struct nvme_passthru_cmd __user
*ucmd
)
397 struct nvme_passthru_cmd cmd
;
398 struct nvme_command c
;
399 unsigned timeout
= 0;
402 if (!capable(CAP_SYS_ADMIN
))
404 if (copy_from_user(&cmd
, ucmd
, sizeof(cmd
)))
407 memset(&c
, 0, sizeof(c
));
408 c
.common
.opcode
= cmd
.opcode
;
409 c
.common
.flags
= cmd
.flags
;
410 c
.common
.nsid
= cpu_to_le32(cmd
.nsid
);
411 c
.common
.cdw2
[0] = cpu_to_le32(cmd
.cdw2
);
412 c
.common
.cdw2
[1] = cpu_to_le32(cmd
.cdw3
);
413 c
.common
.cdw10
[0] = cpu_to_le32(cmd
.cdw10
);
414 c
.common
.cdw10
[1] = cpu_to_le32(cmd
.cdw11
);
415 c
.common
.cdw10
[2] = cpu_to_le32(cmd
.cdw12
);
416 c
.common
.cdw10
[3] = cpu_to_le32(cmd
.cdw13
);
417 c
.common
.cdw10
[4] = cpu_to_le32(cmd
.cdw14
);
418 c
.common
.cdw10
[5] = cpu_to_le32(cmd
.cdw15
);
421 timeout
= msecs_to_jiffies(cmd
.timeout_ms
);
423 status
= nvme_submit_user_cmd(ns
? ns
->queue
: ctrl
->admin_q
, &c
,
424 (void __user
*)(uintptr_t)cmd
.addr
, cmd
.data_len
,
425 &cmd
.result
, timeout
);
427 if (put_user(cmd
.result
, &ucmd
->result
))
434 static int nvme_ioctl(struct block_device
*bdev
, fmode_t mode
,
435 unsigned int cmd
, unsigned long arg
)
437 struct nvme_ns
*ns
= bdev
->bd_disk
->private_data
;
441 force_successful_syscall_return();
443 case NVME_IOCTL_ADMIN_CMD
:
444 return nvme_user_cmd(ns
->ctrl
, NULL
, (void __user
*)arg
);
445 case NVME_IOCTL_IO_CMD
:
446 return nvme_user_cmd(ns
->ctrl
, ns
, (void __user
*)arg
);
447 case NVME_IOCTL_SUBMIT_IO
:
448 return nvme_submit_io(ns
, (void __user
*)arg
);
449 case SG_GET_VERSION_NUM
:
450 return nvme_sg_get_version_num((void __user
*)arg
);
452 return nvme_sg_io(ns
, (void __user
*)arg
);
459 static int nvme_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
460 unsigned int cmd
, unsigned long arg
)
466 return nvme_ioctl(bdev
, mode
, cmd
, arg
);
469 #define nvme_compat_ioctl NULL
472 static int nvme_open(struct block_device
*bdev
, fmode_t mode
)
474 return nvme_get_ns_from_disk(bdev
->bd_disk
) ? 0 : -ENXIO
;
477 static void nvme_release(struct gendisk
*disk
, fmode_t mode
)
479 nvme_put_ns(disk
->private_data
);
482 static int nvme_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
484 /* some standard values */
486 geo
->sectors
= 1 << 5;
487 geo
->cylinders
= get_capacity(bdev
->bd_disk
) >> 11;
491 #ifdef CONFIG_BLK_DEV_INTEGRITY
492 static void nvme_init_integrity(struct nvme_ns
*ns
)
494 struct blk_integrity integrity
;
496 switch (ns
->pi_type
) {
497 case NVME_NS_DPS_PI_TYPE3
:
498 integrity
.profile
= &t10_pi_type3_crc
;
500 case NVME_NS_DPS_PI_TYPE1
:
501 case NVME_NS_DPS_PI_TYPE2
:
502 integrity
.profile
= &t10_pi_type1_crc
;
505 integrity
.profile
= NULL
;
508 integrity
.tuple_size
= ns
->ms
;
509 blk_integrity_register(ns
->disk
, &integrity
);
510 blk_queue_max_integrity_segments(ns
->queue
, 1);
513 static void nvme_init_integrity(struct nvme_ns
*ns
)
516 #endif /* CONFIG_BLK_DEV_INTEGRITY */
518 static void nvme_config_discard(struct nvme_ns
*ns
)
520 u32 logical_block_size
= queue_logical_block_size(ns
->queue
);
521 ns
->queue
->limits
.discard_zeroes_data
= 0;
522 ns
->queue
->limits
.discard_alignment
= logical_block_size
;
523 ns
->queue
->limits
.discard_granularity
= logical_block_size
;
524 blk_queue_max_discard_sectors(ns
->queue
, 0xffffffff);
525 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, ns
->queue
);
528 static int nvme_revalidate_disk(struct gendisk
*disk
)
530 struct nvme_ns
*ns
= disk
->private_data
;
531 struct nvme_id_ns
*id
;
536 if (nvme_identify_ns(ns
->ctrl
, ns
->ns_id
, &id
)) {
537 dev_warn(ns
->ctrl
->dev
, "%s: Identify failure nvme%dn%d\n",
538 __func__
, ns
->ctrl
->instance
, ns
->ns_id
);
546 if (nvme_nvm_ns_supported(ns
, id
) && ns
->type
!= NVME_NS_LIGHTNVM
) {
547 if (nvme_nvm_register(ns
->queue
, disk
->disk_name
)) {
548 dev_warn(ns
->ctrl
->dev
,
549 "%s: LightNVM init failure\n", __func__
);
553 ns
->type
= NVME_NS_LIGHTNVM
;
557 lbaf
= id
->flbas
& NVME_NS_FLBAS_LBA_MASK
;
558 ns
->lba_shift
= id
->lbaf
[lbaf
].ds
;
559 ns
->ms
= le16_to_cpu(id
->lbaf
[lbaf
].ms
);
560 ns
->ext
= ns
->ms
&& (id
->flbas
& NVME_NS_FLBAS_META_EXT
);
563 * If identify namespace failed, use default 512 byte block size so
564 * block layer can use before failing read/write for 0 capacity.
566 if (ns
->lba_shift
== 0)
568 bs
= 1 << ns
->lba_shift
;
570 /* XXX: PI implementation requires metadata equal t10 pi tuple size */
571 pi_type
= ns
->ms
== sizeof(struct t10_pi_tuple
) ?
572 id
->dps
& NVME_NS_DPS_PI_MASK
: 0;
574 blk_mq_freeze_queue(disk
->queue
);
575 if (blk_get_integrity(disk
) && (ns
->pi_type
!= pi_type
||
577 bs
!= queue_logical_block_size(disk
->queue
) ||
578 (ns
->ms
&& ns
->ext
)))
579 blk_integrity_unregister(disk
);
581 ns
->pi_type
= pi_type
;
582 blk_queue_logical_block_size(ns
->queue
, bs
);
584 if (ns
->ms
&& !ns
->ext
)
585 nvme_init_integrity(ns
);
587 if (ns
->ms
&& !(ns
->ms
== 8 && ns
->pi_type
) && !blk_get_integrity(disk
))
588 set_capacity(disk
, 0);
590 set_capacity(disk
, le64_to_cpup(&id
->nsze
) << (ns
->lba_shift
- 9));
592 if (ns
->ctrl
->oncs
& NVME_CTRL_ONCS_DSM
)
593 nvme_config_discard(ns
);
594 blk_mq_unfreeze_queue(disk
->queue
);
600 static char nvme_pr_type(enum pr_type type
)
603 case PR_WRITE_EXCLUSIVE
:
605 case PR_EXCLUSIVE_ACCESS
:
607 case PR_WRITE_EXCLUSIVE_REG_ONLY
:
609 case PR_EXCLUSIVE_ACCESS_REG_ONLY
:
611 case PR_WRITE_EXCLUSIVE_ALL_REGS
:
613 case PR_EXCLUSIVE_ACCESS_ALL_REGS
:
620 static int nvme_pr_command(struct block_device
*bdev
, u32 cdw10
,
621 u64 key
, u64 sa_key
, u8 op
)
623 struct nvme_ns
*ns
= bdev
->bd_disk
->private_data
;
624 struct nvme_command c
;
625 u8 data
[16] = { 0, };
627 put_unaligned_le64(key
, &data
[0]);
628 put_unaligned_le64(sa_key
, &data
[8]);
630 memset(&c
, 0, sizeof(c
));
631 c
.common
.opcode
= op
;
632 c
.common
.nsid
= cpu_to_le32(ns
->ns_id
);
633 c
.common
.cdw10
[0] = cpu_to_le32(cdw10
);
635 return nvme_submit_sync_cmd(ns
->queue
, &c
, data
, 16);
638 static int nvme_pr_register(struct block_device
*bdev
, u64 old
,
639 u64
new, unsigned flags
)
643 if (flags
& ~PR_FL_IGNORE_KEY
)
647 cdw10
|= (flags
& PR_FL_IGNORE_KEY
) ? 1 << 3 : 0;
648 cdw10
|= (1 << 30) | (1 << 31); /* PTPL=1 */
649 return nvme_pr_command(bdev
, cdw10
, old
, new, nvme_cmd_resv_register
);
652 static int nvme_pr_reserve(struct block_device
*bdev
, u64 key
,
653 enum pr_type type
, unsigned flags
)
657 if (flags
& ~PR_FL_IGNORE_KEY
)
660 cdw10
= nvme_pr_type(type
) << 8;
661 cdw10
|= ((flags
& PR_FL_IGNORE_KEY
) ? 1 << 3 : 0);
662 return nvme_pr_command(bdev
, cdw10
, key
, 0, nvme_cmd_resv_acquire
);
665 static int nvme_pr_preempt(struct block_device
*bdev
, u64 old
, u64
new,
666 enum pr_type type
, bool abort
)
668 u32 cdw10
= nvme_pr_type(type
) << 8 | abort
? 2 : 1;
669 return nvme_pr_command(bdev
, cdw10
, old
, new, nvme_cmd_resv_acquire
);
672 static int nvme_pr_clear(struct block_device
*bdev
, u64 key
)
674 u32 cdw10
= 1 | (key
? 1 << 3 : 0);
675 return nvme_pr_command(bdev
, cdw10
, key
, 0, nvme_cmd_resv_register
);
678 static int nvme_pr_release(struct block_device
*bdev
, u64 key
, enum pr_type type
)
680 u32 cdw10
= nvme_pr_type(type
) << 8 | key
? 1 << 3 : 0;
681 return nvme_pr_command(bdev
, cdw10
, key
, 0, nvme_cmd_resv_release
);
684 static const struct pr_ops nvme_pr_ops
= {
685 .pr_register
= nvme_pr_register
,
686 .pr_reserve
= nvme_pr_reserve
,
687 .pr_release
= nvme_pr_release
,
688 .pr_preempt
= nvme_pr_preempt
,
689 .pr_clear
= nvme_pr_clear
,
692 static const struct block_device_operations nvme_fops
= {
693 .owner
= THIS_MODULE
,
695 .compat_ioctl
= nvme_compat_ioctl
,
697 .release
= nvme_release
,
698 .getgeo
= nvme_getgeo
,
699 .revalidate_disk
= nvme_revalidate_disk
,
700 .pr_ops
= &nvme_pr_ops
,
703 static int nvme_wait_ready(struct nvme_ctrl
*ctrl
, u64 cap
, bool enabled
)
705 unsigned long timeout
=
706 ((NVME_CAP_TIMEOUT(cap
) + 1) * HZ
/ 2) + jiffies
;
707 u32 csts
, bit
= enabled
? NVME_CSTS_RDY
: 0;
710 while ((ret
= ctrl
->ops
->reg_read32(ctrl
, NVME_REG_CSTS
, &csts
)) == 0) {
711 if ((csts
& NVME_CSTS_RDY
) == bit
)
715 if (fatal_signal_pending(current
))
717 if (time_after(jiffies
, timeout
)) {
719 "Device not ready; aborting %s\n", enabled
?
720 "initialisation" : "reset");
729 * If the device has been passed off to us in an enabled state, just clear
730 * the enabled bit. The spec says we should set the 'shutdown notification
731 * bits', but doing so may cause the device to complete commands to the
732 * admin queue ... and we don't know what memory that might be pointing at!
734 int nvme_disable_ctrl(struct nvme_ctrl
*ctrl
, u64 cap
)
738 ctrl
->ctrl_config
&= ~NVME_CC_SHN_MASK
;
739 ctrl
->ctrl_config
&= ~NVME_CC_ENABLE
;
741 ret
= ctrl
->ops
->reg_write32(ctrl
, NVME_REG_CC
, ctrl
->ctrl_config
);
744 return nvme_wait_ready(ctrl
, cap
, false);
747 int nvme_enable_ctrl(struct nvme_ctrl
*ctrl
, u64 cap
)
750 * Default to a 4K page size, with the intention to update this
751 * path in the future to accomodate architectures with differing
752 * kernel and IO page sizes.
754 unsigned dev_page_min
= NVME_CAP_MPSMIN(cap
) + 12, page_shift
= 12;
757 if (page_shift
< dev_page_min
) {
759 "Minimum device page size %u too large for host (%u)\n",
760 1 << dev_page_min
, 1 << page_shift
);
764 ctrl
->page_size
= 1 << page_shift
;
766 ctrl
->ctrl_config
= NVME_CC_CSS_NVM
;
767 ctrl
->ctrl_config
|= (page_shift
- 12) << NVME_CC_MPS_SHIFT
;
768 ctrl
->ctrl_config
|= NVME_CC_ARB_RR
| NVME_CC_SHN_NONE
;
769 ctrl
->ctrl_config
|= NVME_CC_IOSQES
| NVME_CC_IOCQES
;
770 ctrl
->ctrl_config
|= NVME_CC_ENABLE
;
772 ret
= ctrl
->ops
->reg_write32(ctrl
, NVME_REG_CC
, ctrl
->ctrl_config
);
775 return nvme_wait_ready(ctrl
, cap
, true);
778 int nvme_shutdown_ctrl(struct nvme_ctrl
*ctrl
)
780 unsigned long timeout
= SHUTDOWN_TIMEOUT
+ jiffies
;
784 ctrl
->ctrl_config
&= ~NVME_CC_SHN_MASK
;
785 ctrl
->ctrl_config
|= NVME_CC_SHN_NORMAL
;
787 ret
= ctrl
->ops
->reg_write32(ctrl
, NVME_REG_CC
, ctrl
->ctrl_config
);
791 while ((ret
= ctrl
->ops
->reg_read32(ctrl
, NVME_REG_CSTS
, &csts
)) == 0) {
792 if ((csts
& NVME_CSTS_SHST_MASK
) == NVME_CSTS_SHST_CMPLT
)
796 if (fatal_signal_pending(current
))
798 if (time_after(jiffies
, timeout
)) {
800 "Device shutdown incomplete; abort shutdown\n");
809 * Initialize the cached copies of the Identify data and various controller
810 * register in our nvme_ctrl structure. This should be called as soon as
811 * the admin queue is fully up and running.
813 int nvme_init_identify(struct nvme_ctrl
*ctrl
)
815 struct nvme_id_ctrl
*id
;
819 ret
= ctrl
->ops
->reg_read32(ctrl
, NVME_REG_VS
, &ctrl
->vs
);
821 dev_err(ctrl
->dev
, "Reading VS failed (%d)\n", ret
);
825 ret
= ctrl
->ops
->reg_read64(ctrl
, NVME_REG_CAP
, &cap
);
827 dev_err(ctrl
->dev
, "Reading CAP failed (%d)\n", ret
);
830 page_shift
= NVME_CAP_MPSMIN(cap
) + 12;
832 if (ctrl
->vs
>= NVME_VS(1, 1))
833 ctrl
->subsystem
= NVME_CAP_NSSRC(cap
);
835 ret
= nvme_identify_ctrl(ctrl
, &id
);
837 dev_err(ctrl
->dev
, "Identify Controller failed (%d)\n", ret
);
841 ctrl
->oncs
= le16_to_cpup(&id
->oncs
);
842 atomic_set(&ctrl
->abort_limit
, id
->acl
+ 1);
844 memcpy(ctrl
->serial
, id
->sn
, sizeof(id
->sn
));
845 memcpy(ctrl
->model
, id
->mn
, sizeof(id
->mn
));
846 memcpy(ctrl
->firmware_rev
, id
->fr
, sizeof(id
->fr
));
848 ctrl
->max_hw_sectors
= 1 << (id
->mdts
+ page_shift
- 9);
850 ctrl
->max_hw_sectors
= UINT_MAX
;
852 if ((ctrl
->quirks
& NVME_QUIRK_STRIPE_SIZE
) && id
->vs
[3]) {
853 unsigned int max_hw_sectors
;
855 ctrl
->stripe_size
= 1 << (id
->vs
[3] + page_shift
);
856 max_hw_sectors
= ctrl
->stripe_size
>> (page_shift
- 9);
857 if (ctrl
->max_hw_sectors
) {
858 ctrl
->max_hw_sectors
= min(max_hw_sectors
,
859 ctrl
->max_hw_sectors
);
861 ctrl
->max_hw_sectors
= max_hw_sectors
;
869 static int nvme_dev_open(struct inode
*inode
, struct file
*file
)
871 struct nvme_ctrl
*ctrl
;
872 int instance
= iminor(inode
);
875 spin_lock(&dev_list_lock
);
876 list_for_each_entry(ctrl
, &nvme_ctrl_list
, node
) {
877 if (ctrl
->instance
!= instance
)
880 if (!ctrl
->admin_q
) {
884 if (!kref_get_unless_zero(&ctrl
->kref
))
886 file
->private_data
= ctrl
;
890 spin_unlock(&dev_list_lock
);
895 static int nvme_dev_release(struct inode
*inode
, struct file
*file
)
897 nvme_put_ctrl(file
->private_data
);
901 static long nvme_dev_ioctl(struct file
*file
, unsigned int cmd
,
904 struct nvme_ctrl
*ctrl
= file
->private_data
;
905 void __user
*argp
= (void __user
*)arg
;
909 case NVME_IOCTL_ADMIN_CMD
:
910 return nvme_user_cmd(ctrl
, NULL
, argp
);
911 case NVME_IOCTL_IO_CMD
:
912 if (list_empty(&ctrl
->namespaces
))
914 ns
= list_first_entry(&ctrl
->namespaces
, struct nvme_ns
, list
);
915 return nvme_user_cmd(ctrl
, ns
, argp
);
916 case NVME_IOCTL_RESET
:
917 dev_warn(ctrl
->dev
, "resetting controller\n");
918 return ctrl
->ops
->reset_ctrl(ctrl
);
919 case NVME_IOCTL_SUBSYS_RESET
:
920 return nvme_reset_subsystem(ctrl
);
926 static const struct file_operations nvme_dev_fops
= {
927 .owner
= THIS_MODULE
,
928 .open
= nvme_dev_open
,
929 .release
= nvme_dev_release
,
930 .unlocked_ioctl
= nvme_dev_ioctl
,
931 .compat_ioctl
= nvme_dev_ioctl
,
934 static ssize_t
nvme_sysfs_reset(struct device
*dev
,
935 struct device_attribute
*attr
, const char *buf
,
938 struct nvme_ctrl
*ctrl
= dev_get_drvdata(dev
);
941 ret
= ctrl
->ops
->reset_ctrl(ctrl
);
946 static DEVICE_ATTR(reset_controller
, S_IWUSR
, NULL
, nvme_sysfs_reset
);
948 static int ns_cmp(void *priv
, struct list_head
*a
, struct list_head
*b
)
950 struct nvme_ns
*nsa
= container_of(a
, struct nvme_ns
, list
);
951 struct nvme_ns
*nsb
= container_of(b
, struct nvme_ns
, list
);
953 return nsa
->ns_id
- nsb
->ns_id
;
956 static struct nvme_ns
*nvme_find_ns(struct nvme_ctrl
*ctrl
, unsigned nsid
)
960 list_for_each_entry(ns
, &ctrl
->namespaces
, list
) {
961 if (ns
->ns_id
== nsid
)
963 if (ns
->ns_id
> nsid
)
969 static void nvme_alloc_ns(struct nvme_ctrl
*ctrl
, unsigned nsid
)
972 struct gendisk
*disk
;
973 int node
= dev_to_node(ctrl
->dev
);
975 ns
= kzalloc_node(sizeof(*ns
), GFP_KERNEL
, node
);
979 ns
->queue
= blk_mq_init_queue(ctrl
->tagset
);
980 if (IS_ERR(ns
->queue
))
982 queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES
, ns
->queue
);
983 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, ns
->queue
);
984 ns
->queue
->queuedata
= ns
;
987 disk
= alloc_disk_node(0, node
);
991 kref_init(&ns
->kref
);
994 ns
->lba_shift
= 9; /* set to a default value for 512 until disk is validated */
995 list_add_tail(&ns
->list
, &ctrl
->namespaces
);
997 blk_queue_logical_block_size(ns
->queue
, 1 << ns
->lba_shift
);
998 if (ctrl
->max_hw_sectors
) {
999 blk_queue_max_hw_sectors(ns
->queue
, ctrl
->max_hw_sectors
);
1000 blk_queue_max_segments(ns
->queue
,
1001 (ctrl
->max_hw_sectors
/ (ctrl
->page_size
>> 9)) + 1);
1003 if (ctrl
->stripe_size
)
1004 blk_queue_chunk_sectors(ns
->queue
, ctrl
->stripe_size
>> 9);
1005 if (ctrl
->vwc
& NVME_CTRL_VWC_PRESENT
)
1006 blk_queue_flush(ns
->queue
, REQ_FLUSH
| REQ_FUA
);
1007 blk_queue_virt_boundary(ns
->queue
, ctrl
->page_size
- 1);
1009 disk
->major
= nvme_major
;
1010 disk
->first_minor
= 0;
1011 disk
->fops
= &nvme_fops
;
1012 disk
->private_data
= ns
;
1013 disk
->queue
= ns
->queue
;
1014 disk
->driverfs_dev
= ctrl
->device
;
1015 disk
->flags
= GENHD_FL_EXT_DEVT
;
1016 sprintf(disk
->disk_name
, "nvme%dn%d", ctrl
->instance
, nsid
);
1019 * Initialize capacity to 0 until we establish the namespace format and
1020 * setup integrity extentions if necessary. The revalidate_disk after
1021 * add_disk allows the driver to register with integrity if the format
1024 set_capacity(disk
, 0);
1025 if (nvme_revalidate_disk(ns
->disk
))
1028 kref_get(&ctrl
->kref
);
1029 if (ns
->type
!= NVME_NS_LIGHTNVM
) {
1032 struct block_device
*bd
= bdget_disk(ns
->disk
, 0);
1035 if (blkdev_get(bd
, FMODE_READ
, NULL
)) {
1039 blkdev_reread_part(bd
);
1040 blkdev_put(bd
, FMODE_READ
);
1047 list_del(&ns
->list
);
1049 blk_cleanup_queue(ns
->queue
);
1054 static void nvme_ns_remove(struct nvme_ns
*ns
)
1056 bool kill
= nvme_io_incapable(ns
->ctrl
) &&
1057 !blk_queue_dying(ns
->queue
);
1060 blk_set_queue_dying(ns
->queue
);
1061 if (ns
->disk
->flags
& GENHD_FL_UP
) {
1062 if (blk_get_integrity(ns
->disk
))
1063 blk_integrity_unregister(ns
->disk
);
1064 del_gendisk(ns
->disk
);
1066 if (kill
|| !blk_queue_dying(ns
->queue
)) {
1067 blk_mq_abort_requeue_list(ns
->queue
);
1068 blk_cleanup_queue(ns
->queue
);
1070 list_del_init(&ns
->list
);
1074 static void __nvme_scan_namespaces(struct nvme_ctrl
*ctrl
, unsigned nn
)
1076 struct nvme_ns
*ns
, *next
;
1079 for (i
= 1; i
<= nn
; i
++) {
1080 ns
= nvme_find_ns(ctrl
, i
);
1082 if (revalidate_disk(ns
->disk
))
1085 nvme_alloc_ns(ctrl
, i
);
1087 list_for_each_entry_safe(ns
, next
, &ctrl
->namespaces
, list
) {
1091 list_sort(NULL
, &ctrl
->namespaces
, ns_cmp
);
1094 void nvme_scan_namespaces(struct nvme_ctrl
*ctrl
)
1096 struct nvme_id_ctrl
*id
;
1098 if (nvme_identify_ctrl(ctrl
, &id
))
1100 __nvme_scan_namespaces(ctrl
, le32_to_cpup(&id
->nn
));
1104 void nvme_remove_namespaces(struct nvme_ctrl
*ctrl
)
1106 struct nvme_ns
*ns
, *next
;
1108 list_for_each_entry_safe(ns
, next
, &ctrl
->namespaces
, list
)
1112 static DEFINE_IDA(nvme_instance_ida
);
1114 static int nvme_set_instance(struct nvme_ctrl
*ctrl
)
1116 int instance
, error
;
1119 if (!ida_pre_get(&nvme_instance_ida
, GFP_KERNEL
))
1122 spin_lock(&dev_list_lock
);
1123 error
= ida_get_new(&nvme_instance_ida
, &instance
);
1124 spin_unlock(&dev_list_lock
);
1125 } while (error
== -EAGAIN
);
1130 ctrl
->instance
= instance
;
1134 static void nvme_release_instance(struct nvme_ctrl
*ctrl
)
1136 spin_lock(&dev_list_lock
);
1137 ida_remove(&nvme_instance_ida
, ctrl
->instance
);
1138 spin_unlock(&dev_list_lock
);
1141 static void nvme_free_ctrl(struct kref
*kref
)
1143 struct nvme_ctrl
*ctrl
= container_of(kref
, struct nvme_ctrl
, kref
);
1145 spin_lock(&dev_list_lock
);
1146 list_del(&ctrl
->node
);
1147 spin_unlock(&dev_list_lock
);
1149 put_device(ctrl
->device
);
1150 nvme_release_instance(ctrl
);
1151 device_destroy(nvme_class
, MKDEV(nvme_char_major
, ctrl
->instance
));
1153 ctrl
->ops
->free_ctrl(ctrl
);
1156 void nvme_put_ctrl(struct nvme_ctrl
*ctrl
)
1158 kref_put(&ctrl
->kref
, nvme_free_ctrl
);
1162 * Initialize a NVMe controller structures. This needs to be called during
1163 * earliest initialization so that we have the initialized structured around
1166 int nvme_init_ctrl(struct nvme_ctrl
*ctrl
, struct device
*dev
,
1167 const struct nvme_ctrl_ops
*ops
, unsigned long quirks
)
1171 INIT_LIST_HEAD(&ctrl
->namespaces
);
1172 kref_init(&ctrl
->kref
);
1175 ctrl
->quirks
= quirks
;
1177 ret
= nvme_set_instance(ctrl
);
1181 ctrl
->device
= device_create(nvme_class
, ctrl
->dev
,
1182 MKDEV(nvme_char_major
, ctrl
->instance
),
1183 dev
, "nvme%d", ctrl
->instance
);
1184 if (IS_ERR(ctrl
->device
)) {
1185 ret
= PTR_ERR(ctrl
->device
);
1186 goto out_release_instance
;
1188 get_device(ctrl
->device
);
1189 dev_set_drvdata(ctrl
->device
, ctrl
);
1191 ret
= device_create_file(ctrl
->device
, &dev_attr_reset_controller
);
1193 goto out_put_device
;
1195 spin_lock(&dev_list_lock
);
1196 list_add_tail(&ctrl
->node
, &nvme_ctrl_list
);
1197 spin_unlock(&dev_list_lock
);
1202 put_device(ctrl
->device
);
1203 device_destroy(nvme_class
, MKDEV(nvme_char_major
, ctrl
->instance
));
1204 out_release_instance
:
1205 nvme_release_instance(ctrl
);
1210 int __init
nvme_core_init(void)
1214 result
= register_blkdev(nvme_major
, "nvme");
1217 else if (result
> 0)
1218 nvme_major
= result
;
1220 result
= __register_chrdev(nvme_char_major
, 0, NVME_MINORS
, "nvme",
1223 goto unregister_blkdev
;
1224 else if (result
> 0)
1225 nvme_char_major
= result
;
1227 nvme_class
= class_create(THIS_MODULE
, "nvme");
1228 if (IS_ERR(nvme_class
)) {
1229 result
= PTR_ERR(nvme_class
);
1230 goto unregister_chrdev
;
1236 __unregister_chrdev(nvme_char_major
, 0, NVME_MINORS
, "nvme");
1238 unregister_blkdev(nvme_major
, "nvme");
1242 void nvme_core_exit(void)
1244 unregister_blkdev(nvme_major
, "nvme");
1245 class_destroy(nvme_class
);
1246 __unregister_chrdev(nvme_char_major
, 0, NVME_MINORS
, "nvme");