2 * NVM Express device driver
3 * Copyright (c) 2011, 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
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
19 #include <linux/nvme.h>
20 #include <linux/bio.h>
21 #include <linux/bitops.h>
22 #include <linux/blkdev.h>
23 #include <linux/delay.h>
24 #include <linux/errno.h>
26 #include <linux/genhd.h>
27 #include <linux/idr.h>
28 #include <linux/init.h>
29 #include <linux/interrupt.h>
31 #include <linux/kdev_t.h>
32 #include <linux/kthread.h>
33 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/moduleparam.h>
37 #include <linux/pci.h>
38 #include <linux/poison.h>
39 #include <linux/ptrace.h>
40 #include <linux/sched.h>
41 #include <linux/slab.h>
42 #include <linux/types.h>
44 #include <asm-generic/io-64-nonatomic-lo-hi.h>
46 #define NVME_Q_DEPTH 1024
47 #define SQ_SIZE(depth) (depth * sizeof(struct nvme_command))
48 #define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion))
49 #define NVME_MINORS 64
50 #define ADMIN_TIMEOUT (60 * HZ)
52 static int nvme_major
;
53 module_param(nvme_major
, int, 0);
55 static int use_threaded_interrupts
;
56 module_param(use_threaded_interrupts
, int, 0);
58 static DEFINE_SPINLOCK(dev_list_lock
);
59 static LIST_HEAD(dev_list
);
60 static struct task_struct
*nvme_thread
;
63 * An NVM Express queue. Each device has at least two (one for admin
64 * commands and one for I/O commands).
67 struct device
*q_dmadev
;
70 struct nvme_command
*sq_cmds
;
71 volatile struct nvme_completion
*cqes
;
72 dma_addr_t sq_dma_addr
;
73 dma_addr_t cq_dma_addr
;
74 wait_queue_head_t sq_full
;
75 wait_queue_t sq_cong_wait
;
76 struct bio_list sq_cong
;
85 unsigned long cmdid_data
[];
89 * Check we didin't inadvertently grow the command struct
91 static inline void _nvme_check_size(void)
93 BUILD_BUG_ON(sizeof(struct nvme_rw_command
) != 64);
94 BUILD_BUG_ON(sizeof(struct nvme_create_cq
) != 64);
95 BUILD_BUG_ON(sizeof(struct nvme_create_sq
) != 64);
96 BUILD_BUG_ON(sizeof(struct nvme_delete_queue
) != 64);
97 BUILD_BUG_ON(sizeof(struct nvme_features
) != 64);
98 BUILD_BUG_ON(sizeof(struct nvme_format_cmd
) != 64);
99 BUILD_BUG_ON(sizeof(struct nvme_command
) != 64);
100 BUILD_BUG_ON(sizeof(struct nvme_id_ctrl
) != 4096);
101 BUILD_BUG_ON(sizeof(struct nvme_id_ns
) != 4096);
102 BUILD_BUG_ON(sizeof(struct nvme_lba_range_type
) != 64);
103 BUILD_BUG_ON(sizeof(struct nvme_smart_log
) != 512);
106 typedef void (*nvme_completion_fn
)(struct nvme_dev
*, void *,
107 struct nvme_completion
*);
109 struct nvme_cmd_info
{
110 nvme_completion_fn fn
;
112 unsigned long timeout
;
115 static struct nvme_cmd_info
*nvme_cmd_info(struct nvme_queue
*nvmeq
)
117 return (void *)&nvmeq
->cmdid_data
[BITS_TO_LONGS(nvmeq
->q_depth
)];
121 * alloc_cmdid() - Allocate a Command ID
122 * @nvmeq: The queue that will be used for this command
123 * @ctx: A pointer that will be passed to the handler
124 * @handler: The function to call on completion
126 * Allocate a Command ID for a queue. The data passed in will
127 * be passed to the completion handler. This is implemented by using
128 * the bottom two bits of the ctx pointer to store the handler ID.
129 * Passing in a pointer that's not 4-byte aligned will cause a BUG.
130 * We can change this if it becomes a problem.
132 * May be called with local interrupts disabled and the q_lock held,
133 * or with interrupts enabled and no locks held.
135 static int alloc_cmdid(struct nvme_queue
*nvmeq
, void *ctx
,
136 nvme_completion_fn handler
, unsigned timeout
)
138 int depth
= nvmeq
->q_depth
- 1;
139 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
143 cmdid
= find_first_zero_bit(nvmeq
->cmdid_data
, depth
);
146 } while (test_and_set_bit(cmdid
, nvmeq
->cmdid_data
));
148 info
[cmdid
].fn
= handler
;
149 info
[cmdid
].ctx
= ctx
;
150 info
[cmdid
].timeout
= jiffies
+ timeout
;
154 static int alloc_cmdid_killable(struct nvme_queue
*nvmeq
, void *ctx
,
155 nvme_completion_fn handler
, unsigned timeout
)
158 wait_event_killable(nvmeq
->sq_full
,
159 (cmdid
= alloc_cmdid(nvmeq
, ctx
, handler
, timeout
)) >= 0);
160 return (cmdid
< 0) ? -EINTR
: cmdid
;
163 /* Special values must be less than 0x1000 */
164 #define CMD_CTX_BASE ((void *)POISON_POINTER_DELTA)
165 #define CMD_CTX_CANCELLED (0x30C + CMD_CTX_BASE)
166 #define CMD_CTX_COMPLETED (0x310 + CMD_CTX_BASE)
167 #define CMD_CTX_INVALID (0x314 + CMD_CTX_BASE)
168 #define CMD_CTX_FLUSH (0x318 + CMD_CTX_BASE)
170 static void special_completion(struct nvme_dev
*dev
, void *ctx
,
171 struct nvme_completion
*cqe
)
173 if (ctx
== CMD_CTX_CANCELLED
)
175 if (ctx
== CMD_CTX_FLUSH
)
177 if (ctx
== CMD_CTX_COMPLETED
) {
178 dev_warn(&dev
->pci_dev
->dev
,
179 "completed id %d twice on queue %d\n",
180 cqe
->command_id
, le16_to_cpup(&cqe
->sq_id
));
183 if (ctx
== CMD_CTX_INVALID
) {
184 dev_warn(&dev
->pci_dev
->dev
,
185 "invalid id %d completed on queue %d\n",
186 cqe
->command_id
, le16_to_cpup(&cqe
->sq_id
));
190 dev_warn(&dev
->pci_dev
->dev
, "Unknown special completion %p\n", ctx
);
194 * Called with local interrupts disabled and the q_lock held. May not sleep.
196 static void *free_cmdid(struct nvme_queue
*nvmeq
, int cmdid
,
197 nvme_completion_fn
*fn
)
200 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
202 if (cmdid
>= nvmeq
->q_depth
) {
203 *fn
= special_completion
;
204 return CMD_CTX_INVALID
;
207 *fn
= info
[cmdid
].fn
;
208 ctx
= info
[cmdid
].ctx
;
209 info
[cmdid
].fn
= special_completion
;
210 info
[cmdid
].ctx
= CMD_CTX_COMPLETED
;
211 clear_bit(cmdid
, nvmeq
->cmdid_data
);
212 wake_up(&nvmeq
->sq_full
);
216 static void *cancel_cmdid(struct nvme_queue
*nvmeq
, int cmdid
,
217 nvme_completion_fn
*fn
)
220 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
222 *fn
= info
[cmdid
].fn
;
223 ctx
= info
[cmdid
].ctx
;
224 info
[cmdid
].fn
= special_completion
;
225 info
[cmdid
].ctx
= CMD_CTX_CANCELLED
;
229 struct nvme_queue
*get_nvmeq(struct nvme_dev
*dev
)
231 return dev
->queues
[get_cpu() + 1];
234 void put_nvmeq(struct nvme_queue
*nvmeq
)
240 * nvme_submit_cmd() - Copy a command into a queue and ring the doorbell
241 * @nvmeq: The queue to use
242 * @cmd: The command to send
244 * Safe to use from interrupt context
246 static int nvme_submit_cmd(struct nvme_queue
*nvmeq
, struct nvme_command
*cmd
)
250 spin_lock_irqsave(&nvmeq
->q_lock
, flags
);
251 tail
= nvmeq
->sq_tail
;
252 memcpy(&nvmeq
->sq_cmds
[tail
], cmd
, sizeof(*cmd
));
253 if (++tail
== nvmeq
->q_depth
)
255 writel(tail
, nvmeq
->q_db
);
256 nvmeq
->sq_tail
= tail
;
257 spin_unlock_irqrestore(&nvmeq
->q_lock
, flags
);
262 static __le64
**iod_list(struct nvme_iod
*iod
)
264 return ((void *)iod
) + iod
->offset
;
268 * Will slightly overestimate the number of pages needed. This is OK
269 * as it only leads to a small amount of wasted memory for the lifetime of
272 static int nvme_npages(unsigned size
)
274 unsigned nprps
= DIV_ROUND_UP(size
+ PAGE_SIZE
, PAGE_SIZE
);
275 return DIV_ROUND_UP(8 * nprps
, PAGE_SIZE
- 8);
278 static struct nvme_iod
*
279 nvme_alloc_iod(unsigned nseg
, unsigned nbytes
, gfp_t gfp
)
281 struct nvme_iod
*iod
= kmalloc(sizeof(struct nvme_iod
) +
282 sizeof(__le64
*) * nvme_npages(nbytes
) +
283 sizeof(struct scatterlist
) * nseg
, gfp
);
286 iod
->offset
= offsetof(struct nvme_iod
, sg
[nseg
]);
288 iod
->length
= nbytes
;
290 iod
->start_time
= jiffies
;
296 void nvme_free_iod(struct nvme_dev
*dev
, struct nvme_iod
*iod
)
298 const int last_prp
= PAGE_SIZE
/ 8 - 1;
300 __le64
**list
= iod_list(iod
);
301 dma_addr_t prp_dma
= iod
->first_dma
;
303 if (iod
->npages
== 0)
304 dma_pool_free(dev
->prp_small_pool
, list
[0], prp_dma
);
305 for (i
= 0; i
< iod
->npages
; i
++) {
306 __le64
*prp_list
= list
[i
];
307 dma_addr_t next_prp_dma
= le64_to_cpu(prp_list
[last_prp
]);
308 dma_pool_free(dev
->prp_page_pool
, prp_list
, prp_dma
);
309 prp_dma
= next_prp_dma
;
314 static void nvme_start_io_acct(struct bio
*bio
)
316 struct gendisk
*disk
= bio
->bi_bdev
->bd_disk
;
317 const int rw
= bio_data_dir(bio
);
318 int cpu
= part_stat_lock();
319 part_round_stats(cpu
, &disk
->part0
);
320 part_stat_inc(cpu
, &disk
->part0
, ios
[rw
]);
321 part_stat_add(cpu
, &disk
->part0
, sectors
[rw
], bio_sectors(bio
));
322 part_inc_in_flight(&disk
->part0
, rw
);
326 static void nvme_end_io_acct(struct bio
*bio
, unsigned long start_time
)
328 struct gendisk
*disk
= bio
->bi_bdev
->bd_disk
;
329 const int rw
= bio_data_dir(bio
);
330 unsigned long duration
= jiffies
- start_time
;
331 int cpu
= part_stat_lock();
332 part_stat_add(cpu
, &disk
->part0
, ticks
[rw
], duration
);
333 part_round_stats(cpu
, &disk
->part0
);
334 part_dec_in_flight(&disk
->part0
, rw
);
338 static void bio_completion(struct nvme_dev
*dev
, void *ctx
,
339 struct nvme_completion
*cqe
)
341 struct nvme_iod
*iod
= ctx
;
342 struct bio
*bio
= iod
->private;
343 u16 status
= le16_to_cpup(&cqe
->status
) >> 1;
346 dma_unmap_sg(&dev
->pci_dev
->dev
, iod
->sg
, iod
->nents
,
347 bio_data_dir(bio
) ? DMA_TO_DEVICE
: DMA_FROM_DEVICE
);
349 nvme_end_io_acct(bio
, iod
->start_time
);
350 nvme_free_iod(dev
, iod
);
352 bio_endio(bio
, -EIO
);
357 /* length is in bytes. gfp flags indicates whether we may sleep. */
358 int nvme_setup_prps(struct nvme_dev
*dev
, struct nvme_common_command
*cmd
,
359 struct nvme_iod
*iod
, int total_len
, gfp_t gfp
)
361 struct dma_pool
*pool
;
362 int length
= total_len
;
363 struct scatterlist
*sg
= iod
->sg
;
364 int dma_len
= sg_dma_len(sg
);
365 u64 dma_addr
= sg_dma_address(sg
);
366 int offset
= offset_in_page(dma_addr
);
368 __le64
**list
= iod_list(iod
);
372 cmd
->prp1
= cpu_to_le64(dma_addr
);
373 length
-= (PAGE_SIZE
- offset
);
377 dma_len
-= (PAGE_SIZE
- offset
);
379 dma_addr
+= (PAGE_SIZE
- offset
);
382 dma_addr
= sg_dma_address(sg
);
383 dma_len
= sg_dma_len(sg
);
386 if (length
<= PAGE_SIZE
) {
387 cmd
->prp2
= cpu_to_le64(dma_addr
);
391 nprps
= DIV_ROUND_UP(length
, PAGE_SIZE
);
392 if (nprps
<= (256 / 8)) {
393 pool
= dev
->prp_small_pool
;
396 pool
= dev
->prp_page_pool
;
400 prp_list
= dma_pool_alloc(pool
, gfp
, &prp_dma
);
402 cmd
->prp2
= cpu_to_le64(dma_addr
);
404 return (total_len
- length
) + PAGE_SIZE
;
407 iod
->first_dma
= prp_dma
;
408 cmd
->prp2
= cpu_to_le64(prp_dma
);
411 if (i
== PAGE_SIZE
/ 8) {
412 __le64
*old_prp_list
= prp_list
;
413 prp_list
= dma_pool_alloc(pool
, gfp
, &prp_dma
);
415 return total_len
- length
;
416 list
[iod
->npages
++] = prp_list
;
417 prp_list
[0] = old_prp_list
[i
- 1];
418 old_prp_list
[i
- 1] = cpu_to_le64(prp_dma
);
421 prp_list
[i
++] = cpu_to_le64(dma_addr
);
422 dma_len
-= PAGE_SIZE
;
423 dma_addr
+= PAGE_SIZE
;
431 dma_addr
= sg_dma_address(sg
);
432 dma_len
= sg_dma_len(sg
);
438 struct nvme_bio_pair
{
439 struct bio b1
, b2
, *parent
;
440 struct bio_vec
*bv1
, *bv2
;
445 static void nvme_bio_pair_endio(struct bio
*bio
, int err
)
447 struct nvme_bio_pair
*bp
= bio
->bi_private
;
452 if (atomic_dec_and_test(&bp
->cnt
)) {
453 bio_endio(bp
->parent
, bp
->err
);
460 static struct nvme_bio_pair
*nvme_bio_split(struct bio
*bio
, int idx
,
463 struct nvme_bio_pair
*bp
;
465 BUG_ON(len
> bio
->bi_size
);
466 BUG_ON(idx
> bio
->bi_vcnt
);
468 bp
= kmalloc(sizeof(*bp
), GFP_ATOMIC
);
476 bp
->b1
.bi_size
= len
;
477 bp
->b2
.bi_size
-= len
;
478 bp
->b1
.bi_vcnt
= idx
;
480 bp
->b2
.bi_sector
+= len
>> 9;
483 bp
->bv1
= kmalloc(bio
->bi_max_vecs
* sizeof(struct bio_vec
),
488 bp
->bv2
= kmalloc(bio
->bi_max_vecs
* sizeof(struct bio_vec
),
493 memcpy(bp
->bv1
, bio
->bi_io_vec
,
494 bio
->bi_max_vecs
* sizeof(struct bio_vec
));
495 memcpy(bp
->bv2
, bio
->bi_io_vec
,
496 bio
->bi_max_vecs
* sizeof(struct bio_vec
));
498 bp
->b1
.bi_io_vec
= bp
->bv1
;
499 bp
->b2
.bi_io_vec
= bp
->bv2
;
500 bp
->b2
.bi_io_vec
[idx
].bv_offset
+= offset
;
501 bp
->b2
.bi_io_vec
[idx
].bv_len
-= offset
;
502 bp
->b1
.bi_io_vec
[idx
].bv_len
= offset
;
505 bp
->bv1
= bp
->bv2
= NULL
;
507 bp
->b1
.bi_private
= bp
;
508 bp
->b2
.bi_private
= bp
;
510 bp
->b1
.bi_end_io
= nvme_bio_pair_endio
;
511 bp
->b2
.bi_end_io
= nvme_bio_pair_endio
;
514 atomic_set(&bp
->cnt
, 2);
525 static int nvme_split_and_submit(struct bio
*bio
, struct nvme_queue
*nvmeq
,
526 int idx
, int len
, int offset
)
528 struct nvme_bio_pair
*bp
= nvme_bio_split(bio
, idx
, len
, offset
);
532 if (bio_list_empty(&nvmeq
->sq_cong
))
533 add_wait_queue(&nvmeq
->sq_full
, &nvmeq
->sq_cong_wait
);
534 bio_list_add(&nvmeq
->sq_cong
, &bp
->b1
);
535 bio_list_add(&nvmeq
->sq_cong
, &bp
->b2
);
540 /* NVMe scatterlists require no holes in the virtual address */
541 #define BIOVEC_NOT_VIRT_MERGEABLE(vec1, vec2) ((vec2)->bv_offset || \
542 (((vec1)->bv_offset + (vec1)->bv_len) % PAGE_SIZE))
544 static int nvme_map_bio(struct nvme_queue
*nvmeq
, struct nvme_iod
*iod
,
545 struct bio
*bio
, enum dma_data_direction dma_dir
, int psegs
)
547 struct bio_vec
*bvec
, *bvprv
= NULL
;
548 struct scatterlist
*sg
= NULL
;
549 int i
, length
= 0, nsegs
= 0, split_len
= bio
->bi_size
;
551 if (nvmeq
->dev
->stripe_size
)
552 split_len
= nvmeq
->dev
->stripe_size
-
553 ((bio
->bi_sector
<< 9) & (nvmeq
->dev
->stripe_size
- 1));
555 sg_init_table(iod
->sg
, psegs
);
556 bio_for_each_segment(bvec
, bio
, i
) {
557 if (bvprv
&& BIOVEC_PHYS_MERGEABLE(bvprv
, bvec
)) {
558 sg
->length
+= bvec
->bv_len
;
560 if (bvprv
&& BIOVEC_NOT_VIRT_MERGEABLE(bvprv
, bvec
))
561 return nvme_split_and_submit(bio
, nvmeq
, i
,
564 sg
= sg
? sg
+ 1 : iod
->sg
;
565 sg_set_page(sg
, bvec
->bv_page
, bvec
->bv_len
,
570 if (split_len
- length
< bvec
->bv_len
)
571 return nvme_split_and_submit(bio
, nvmeq
, i
, split_len
,
573 length
+= bvec
->bv_len
;
578 if (dma_map_sg(nvmeq
->q_dmadev
, iod
->sg
, iod
->nents
, dma_dir
) == 0)
581 BUG_ON(length
!= bio
->bi_size
);
586 * We reuse the small pool to allocate the 16-byte range here as it is not
587 * worth having a special pool for these or additional cases to handle freeing
590 static int nvme_submit_discard(struct nvme_queue
*nvmeq
, struct nvme_ns
*ns
,
591 struct bio
*bio
, struct nvme_iod
*iod
, int cmdid
)
593 struct nvme_dsm_range
*range
;
594 struct nvme_command
*cmnd
= &nvmeq
->sq_cmds
[nvmeq
->sq_tail
];
596 range
= dma_pool_alloc(nvmeq
->dev
->prp_small_pool
, GFP_ATOMIC
,
601 iod_list(iod
)[0] = (__le64
*)range
;
604 range
->cattr
= cpu_to_le32(0);
605 range
->nlb
= cpu_to_le32(bio
->bi_size
>> ns
->lba_shift
);
606 range
->slba
= cpu_to_le64(nvme_block_nr(ns
, bio
->bi_sector
));
608 memset(cmnd
, 0, sizeof(*cmnd
));
609 cmnd
->dsm
.opcode
= nvme_cmd_dsm
;
610 cmnd
->dsm
.command_id
= cmdid
;
611 cmnd
->dsm
.nsid
= cpu_to_le32(ns
->ns_id
);
612 cmnd
->dsm
.prp1
= cpu_to_le64(iod
->first_dma
);
614 cmnd
->dsm
.attributes
= cpu_to_le32(NVME_DSMGMT_AD
);
616 if (++nvmeq
->sq_tail
== nvmeq
->q_depth
)
618 writel(nvmeq
->sq_tail
, nvmeq
->q_db
);
623 static int nvme_submit_flush(struct nvme_queue
*nvmeq
, struct nvme_ns
*ns
,
626 struct nvme_command
*cmnd
= &nvmeq
->sq_cmds
[nvmeq
->sq_tail
];
628 memset(cmnd
, 0, sizeof(*cmnd
));
629 cmnd
->common
.opcode
= nvme_cmd_flush
;
630 cmnd
->common
.command_id
= cmdid
;
631 cmnd
->common
.nsid
= cpu_to_le32(ns
->ns_id
);
633 if (++nvmeq
->sq_tail
== nvmeq
->q_depth
)
635 writel(nvmeq
->sq_tail
, nvmeq
->q_db
);
640 int nvme_submit_flush_data(struct nvme_queue
*nvmeq
, struct nvme_ns
*ns
)
642 int cmdid
= alloc_cmdid(nvmeq
, (void *)CMD_CTX_FLUSH
,
643 special_completion
, NVME_IO_TIMEOUT
);
644 if (unlikely(cmdid
< 0))
647 return nvme_submit_flush(nvmeq
, ns
, cmdid
);
651 * Called with local interrupts disabled and the q_lock held. May not sleep.
653 static int nvme_submit_bio_queue(struct nvme_queue
*nvmeq
, struct nvme_ns
*ns
,
656 struct nvme_command
*cmnd
;
657 struct nvme_iod
*iod
;
658 enum dma_data_direction dma_dir
;
659 int cmdid
, length
, result
;
662 int psegs
= bio_phys_segments(ns
->queue
, bio
);
664 if ((bio
->bi_rw
& REQ_FLUSH
) && psegs
) {
665 result
= nvme_submit_flush_data(nvmeq
, ns
);
671 iod
= nvme_alloc_iod(psegs
, bio
->bi_size
, GFP_ATOMIC
);
677 cmdid
= alloc_cmdid(nvmeq
, iod
, bio_completion
, NVME_IO_TIMEOUT
);
678 if (unlikely(cmdid
< 0))
681 if (bio
->bi_rw
& REQ_DISCARD
) {
682 result
= nvme_submit_discard(nvmeq
, ns
, bio
, iod
, cmdid
);
687 if ((bio
->bi_rw
& REQ_FLUSH
) && !psegs
)
688 return nvme_submit_flush(nvmeq
, ns
, cmdid
);
691 if (bio
->bi_rw
& REQ_FUA
)
692 control
|= NVME_RW_FUA
;
693 if (bio
->bi_rw
& (REQ_FAILFAST_DEV
| REQ_RAHEAD
))
694 control
|= NVME_RW_LR
;
697 if (bio
->bi_rw
& REQ_RAHEAD
)
698 dsmgmt
|= NVME_RW_DSM_FREQ_PREFETCH
;
700 cmnd
= &nvmeq
->sq_cmds
[nvmeq
->sq_tail
];
702 memset(cmnd
, 0, sizeof(*cmnd
));
703 if (bio_data_dir(bio
)) {
704 cmnd
->rw
.opcode
= nvme_cmd_write
;
705 dma_dir
= DMA_TO_DEVICE
;
707 cmnd
->rw
.opcode
= nvme_cmd_read
;
708 dma_dir
= DMA_FROM_DEVICE
;
711 result
= nvme_map_bio(nvmeq
, iod
, bio
, dma_dir
, psegs
);
716 cmnd
->rw
.command_id
= cmdid
;
717 cmnd
->rw
.nsid
= cpu_to_le32(ns
->ns_id
);
718 length
= nvme_setup_prps(nvmeq
->dev
, &cmnd
->common
, iod
, length
,
720 cmnd
->rw
.slba
= cpu_to_le64(nvme_block_nr(ns
, bio
->bi_sector
));
721 cmnd
->rw
.length
= cpu_to_le16((length
>> ns
->lba_shift
) - 1);
722 cmnd
->rw
.control
= cpu_to_le16(control
);
723 cmnd
->rw
.dsmgmt
= cpu_to_le32(dsmgmt
);
725 nvme_start_io_acct(bio
);
726 if (++nvmeq
->sq_tail
== nvmeq
->q_depth
)
728 writel(nvmeq
->sq_tail
, nvmeq
->q_db
);
733 free_cmdid(nvmeq
, cmdid
, NULL
);
735 nvme_free_iod(nvmeq
->dev
, iod
);
740 static int nvme_process_cq(struct nvme_queue
*nvmeq
)
744 head
= nvmeq
->cq_head
;
745 phase
= nvmeq
->cq_phase
;
749 nvme_completion_fn fn
;
750 struct nvme_completion cqe
= nvmeq
->cqes
[head
];
751 if ((le16_to_cpu(cqe
.status
) & 1) != phase
)
753 nvmeq
->sq_head
= le16_to_cpu(cqe
.sq_head
);
754 if (++head
== nvmeq
->q_depth
) {
759 ctx
= free_cmdid(nvmeq
, cqe
.command_id
, &fn
);
760 fn(nvmeq
->dev
, ctx
, &cqe
);
763 /* If the controller ignores the cq head doorbell and continuously
764 * writes to the queue, it is theoretically possible to wrap around
765 * the queue twice and mistakenly return IRQ_NONE. Linux only
766 * requires that 0.1% of your interrupts are handled, so this isn't
769 if (head
== nvmeq
->cq_head
&& phase
== nvmeq
->cq_phase
)
772 writel(head
, nvmeq
->q_db
+ (1 << nvmeq
->dev
->db_stride
));
773 nvmeq
->cq_head
= head
;
774 nvmeq
->cq_phase
= phase
;
780 static void nvme_make_request(struct request_queue
*q
, struct bio
*bio
)
782 struct nvme_ns
*ns
= q
->queuedata
;
783 struct nvme_queue
*nvmeq
= get_nvmeq(ns
->dev
);
786 spin_lock_irq(&nvmeq
->q_lock
);
787 if (bio_list_empty(&nvmeq
->sq_cong
))
788 result
= nvme_submit_bio_queue(nvmeq
, ns
, bio
);
789 if (unlikely(result
)) {
790 if (bio_list_empty(&nvmeq
->sq_cong
))
791 add_wait_queue(&nvmeq
->sq_full
, &nvmeq
->sq_cong_wait
);
792 bio_list_add(&nvmeq
->sq_cong
, bio
);
795 nvme_process_cq(nvmeq
);
796 spin_unlock_irq(&nvmeq
->q_lock
);
800 static irqreturn_t
nvme_irq(int irq
, void *data
)
803 struct nvme_queue
*nvmeq
= data
;
804 spin_lock(&nvmeq
->q_lock
);
805 nvme_process_cq(nvmeq
);
806 result
= nvmeq
->cqe_seen
? IRQ_HANDLED
: IRQ_NONE
;
808 spin_unlock(&nvmeq
->q_lock
);
812 static irqreturn_t
nvme_irq_check(int irq
, void *data
)
814 struct nvme_queue
*nvmeq
= data
;
815 struct nvme_completion cqe
= nvmeq
->cqes
[nvmeq
->cq_head
];
816 if ((le16_to_cpu(cqe
.status
) & 1) != nvmeq
->cq_phase
)
818 return IRQ_WAKE_THREAD
;
821 static void nvme_abort_command(struct nvme_queue
*nvmeq
, int cmdid
)
823 spin_lock_irq(&nvmeq
->q_lock
);
824 cancel_cmdid(nvmeq
, cmdid
, NULL
);
825 spin_unlock_irq(&nvmeq
->q_lock
);
828 struct sync_cmd_info
{
829 struct task_struct
*task
;
834 static void sync_completion(struct nvme_dev
*dev
, void *ctx
,
835 struct nvme_completion
*cqe
)
837 struct sync_cmd_info
*cmdinfo
= ctx
;
838 cmdinfo
->result
= le32_to_cpup(&cqe
->result
);
839 cmdinfo
->status
= le16_to_cpup(&cqe
->status
) >> 1;
840 wake_up_process(cmdinfo
->task
);
844 * Returns 0 on success. If the result is negative, it's a Linux error code;
845 * if the result is positive, it's an NVM Express status code
847 int nvme_submit_sync_cmd(struct nvme_queue
*nvmeq
, struct nvme_command
*cmd
,
848 u32
*result
, unsigned timeout
)
851 struct sync_cmd_info cmdinfo
;
853 cmdinfo
.task
= current
;
854 cmdinfo
.status
= -EINTR
;
856 cmdid
= alloc_cmdid_killable(nvmeq
, &cmdinfo
, sync_completion
,
860 cmd
->common
.command_id
= cmdid
;
862 set_current_state(TASK_KILLABLE
);
863 nvme_submit_cmd(nvmeq
, cmd
);
864 schedule_timeout(timeout
);
866 if (cmdinfo
.status
== -EINTR
) {
867 nvme_abort_command(nvmeq
, cmdid
);
872 *result
= cmdinfo
.result
;
874 return cmdinfo
.status
;
877 int nvme_submit_admin_cmd(struct nvme_dev
*dev
, struct nvme_command
*cmd
,
880 return nvme_submit_sync_cmd(dev
->queues
[0], cmd
, result
, ADMIN_TIMEOUT
);
883 static int adapter_delete_queue(struct nvme_dev
*dev
, u8 opcode
, u16 id
)
886 struct nvme_command c
;
888 memset(&c
, 0, sizeof(c
));
889 c
.delete_queue
.opcode
= opcode
;
890 c
.delete_queue
.qid
= cpu_to_le16(id
);
892 status
= nvme_submit_admin_cmd(dev
, &c
, NULL
);
898 static int adapter_alloc_cq(struct nvme_dev
*dev
, u16 qid
,
899 struct nvme_queue
*nvmeq
)
902 struct nvme_command c
;
903 int flags
= NVME_QUEUE_PHYS_CONTIG
| NVME_CQ_IRQ_ENABLED
;
905 memset(&c
, 0, sizeof(c
));
906 c
.create_cq
.opcode
= nvme_admin_create_cq
;
907 c
.create_cq
.prp1
= cpu_to_le64(nvmeq
->cq_dma_addr
);
908 c
.create_cq
.cqid
= cpu_to_le16(qid
);
909 c
.create_cq
.qsize
= cpu_to_le16(nvmeq
->q_depth
- 1);
910 c
.create_cq
.cq_flags
= cpu_to_le16(flags
);
911 c
.create_cq
.irq_vector
= cpu_to_le16(nvmeq
->cq_vector
);
913 status
= nvme_submit_admin_cmd(dev
, &c
, NULL
);
919 static int adapter_alloc_sq(struct nvme_dev
*dev
, u16 qid
,
920 struct nvme_queue
*nvmeq
)
923 struct nvme_command c
;
924 int flags
= NVME_QUEUE_PHYS_CONTIG
| NVME_SQ_PRIO_MEDIUM
;
926 memset(&c
, 0, sizeof(c
));
927 c
.create_sq
.opcode
= nvme_admin_create_sq
;
928 c
.create_sq
.prp1
= cpu_to_le64(nvmeq
->sq_dma_addr
);
929 c
.create_sq
.sqid
= cpu_to_le16(qid
);
930 c
.create_sq
.qsize
= cpu_to_le16(nvmeq
->q_depth
- 1);
931 c
.create_sq
.sq_flags
= cpu_to_le16(flags
);
932 c
.create_sq
.cqid
= cpu_to_le16(qid
);
934 status
= nvme_submit_admin_cmd(dev
, &c
, NULL
);
940 static int adapter_delete_cq(struct nvme_dev
*dev
, u16 cqid
)
942 return adapter_delete_queue(dev
, nvme_admin_delete_cq
, cqid
);
945 static int adapter_delete_sq(struct nvme_dev
*dev
, u16 sqid
)
947 return adapter_delete_queue(dev
, nvme_admin_delete_sq
, sqid
);
950 int nvme_identify(struct nvme_dev
*dev
, unsigned nsid
, unsigned cns
,
953 struct nvme_command c
;
955 memset(&c
, 0, sizeof(c
));
956 c
.identify
.opcode
= nvme_admin_identify
;
957 c
.identify
.nsid
= cpu_to_le32(nsid
);
958 c
.identify
.prp1
= cpu_to_le64(dma_addr
);
959 c
.identify
.cns
= cpu_to_le32(cns
);
961 return nvme_submit_admin_cmd(dev
, &c
, NULL
);
964 int nvme_get_features(struct nvme_dev
*dev
, unsigned fid
, unsigned nsid
,
965 dma_addr_t dma_addr
, u32
*result
)
967 struct nvme_command c
;
969 memset(&c
, 0, sizeof(c
));
970 c
.features
.opcode
= nvme_admin_get_features
;
971 c
.features
.nsid
= cpu_to_le32(nsid
);
972 c
.features
.prp1
= cpu_to_le64(dma_addr
);
973 c
.features
.fid
= cpu_to_le32(fid
);
975 return nvme_submit_admin_cmd(dev
, &c
, result
);
978 int nvme_set_features(struct nvme_dev
*dev
, unsigned fid
, unsigned dword11
,
979 dma_addr_t dma_addr
, u32
*result
)
981 struct nvme_command c
;
983 memset(&c
, 0, sizeof(c
));
984 c
.features
.opcode
= nvme_admin_set_features
;
985 c
.features
.prp1
= cpu_to_le64(dma_addr
);
986 c
.features
.fid
= cpu_to_le32(fid
);
987 c
.features
.dword11
= cpu_to_le32(dword11
);
989 return nvme_submit_admin_cmd(dev
, &c
, result
);
993 * nvme_cancel_ios - Cancel outstanding I/Os
994 * @queue: The queue to cancel I/Os on
995 * @timeout: True to only cancel I/Os which have timed out
997 static void nvme_cancel_ios(struct nvme_queue
*nvmeq
, bool timeout
)
999 int depth
= nvmeq
->q_depth
- 1;
1000 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
1001 unsigned long now
= jiffies
;
1004 for_each_set_bit(cmdid
, nvmeq
->cmdid_data
, depth
) {
1006 nvme_completion_fn fn
;
1007 static struct nvme_completion cqe
= {
1008 .status
= cpu_to_le16(NVME_SC_ABORT_REQ
<< 1),
1011 if (timeout
&& !time_after(now
, info
[cmdid
].timeout
))
1013 if (info
[cmdid
].ctx
== CMD_CTX_CANCELLED
)
1015 dev_warn(nvmeq
->q_dmadev
, "Cancelling I/O %d\n", cmdid
);
1016 ctx
= cancel_cmdid(nvmeq
, cmdid
, &fn
);
1017 fn(nvmeq
->dev
, ctx
, &cqe
);
1021 static void nvme_free_queue_mem(struct nvme_queue
*nvmeq
)
1023 dma_free_coherent(nvmeq
->q_dmadev
, CQ_SIZE(nvmeq
->q_depth
),
1024 (void *)nvmeq
->cqes
, nvmeq
->cq_dma_addr
);
1025 dma_free_coherent(nvmeq
->q_dmadev
, SQ_SIZE(nvmeq
->q_depth
),
1026 nvmeq
->sq_cmds
, nvmeq
->sq_dma_addr
);
1030 static void nvme_free_queue(struct nvme_dev
*dev
, int qid
)
1032 struct nvme_queue
*nvmeq
= dev
->queues
[qid
];
1033 int vector
= dev
->entry
[nvmeq
->cq_vector
].vector
;
1035 spin_lock_irq(&nvmeq
->q_lock
);
1036 nvme_cancel_ios(nvmeq
, false);
1037 while (bio_list_peek(&nvmeq
->sq_cong
)) {
1038 struct bio
*bio
= bio_list_pop(&nvmeq
->sq_cong
);
1039 bio_endio(bio
, -EIO
);
1041 spin_unlock_irq(&nvmeq
->q_lock
);
1043 irq_set_affinity_hint(vector
, NULL
);
1044 free_irq(vector
, nvmeq
);
1046 /* Don't tell the adapter to delete the admin queue */
1048 adapter_delete_sq(dev
, qid
);
1049 adapter_delete_cq(dev
, qid
);
1052 nvme_free_queue_mem(nvmeq
);
1055 static struct nvme_queue
*nvme_alloc_queue(struct nvme_dev
*dev
, int qid
,
1056 int depth
, int vector
)
1058 struct device
*dmadev
= &dev
->pci_dev
->dev
;
1059 unsigned extra
= DIV_ROUND_UP(depth
, 8) + (depth
*
1060 sizeof(struct nvme_cmd_info
));
1061 struct nvme_queue
*nvmeq
= kzalloc(sizeof(*nvmeq
) + extra
, GFP_KERNEL
);
1065 nvmeq
->cqes
= dma_alloc_coherent(dmadev
, CQ_SIZE(depth
),
1066 &nvmeq
->cq_dma_addr
, GFP_KERNEL
);
1069 memset((void *)nvmeq
->cqes
, 0, CQ_SIZE(depth
));
1071 nvmeq
->sq_cmds
= dma_alloc_coherent(dmadev
, SQ_SIZE(depth
),
1072 &nvmeq
->sq_dma_addr
, GFP_KERNEL
);
1073 if (!nvmeq
->sq_cmds
)
1076 nvmeq
->q_dmadev
= dmadev
;
1078 spin_lock_init(&nvmeq
->q_lock
);
1080 nvmeq
->cq_phase
= 1;
1081 init_waitqueue_head(&nvmeq
->sq_full
);
1082 init_waitqueue_entry(&nvmeq
->sq_cong_wait
, nvme_thread
);
1083 bio_list_init(&nvmeq
->sq_cong
);
1084 nvmeq
->q_db
= &dev
->dbs
[qid
<< (dev
->db_stride
+ 1)];
1085 nvmeq
->q_depth
= depth
;
1086 nvmeq
->cq_vector
= vector
;
1091 dma_free_coherent(dmadev
, CQ_SIZE(depth
), (void *)nvmeq
->cqes
,
1092 nvmeq
->cq_dma_addr
);
1098 static int queue_request_irq(struct nvme_dev
*dev
, struct nvme_queue
*nvmeq
,
1101 if (use_threaded_interrupts
)
1102 return request_threaded_irq(dev
->entry
[nvmeq
->cq_vector
].vector
,
1103 nvme_irq_check
, nvme_irq
,
1104 IRQF_DISABLED
| IRQF_SHARED
,
1106 return request_irq(dev
->entry
[nvmeq
->cq_vector
].vector
, nvme_irq
,
1107 IRQF_DISABLED
| IRQF_SHARED
, name
, nvmeq
);
1110 static struct nvme_queue
*nvme_create_queue(struct nvme_dev
*dev
, int qid
,
1111 int cq_size
, int vector
)
1114 struct nvme_queue
*nvmeq
= nvme_alloc_queue(dev
, qid
, cq_size
, vector
);
1117 return ERR_PTR(-ENOMEM
);
1119 result
= adapter_alloc_cq(dev
, qid
, nvmeq
);
1123 result
= adapter_alloc_sq(dev
, qid
, nvmeq
);
1127 result
= queue_request_irq(dev
, nvmeq
, "nvme");
1134 adapter_delete_sq(dev
, qid
);
1136 adapter_delete_cq(dev
, qid
);
1138 dma_free_coherent(nvmeq
->q_dmadev
, CQ_SIZE(nvmeq
->q_depth
),
1139 (void *)nvmeq
->cqes
, nvmeq
->cq_dma_addr
);
1140 dma_free_coherent(nvmeq
->q_dmadev
, SQ_SIZE(nvmeq
->q_depth
),
1141 nvmeq
->sq_cmds
, nvmeq
->sq_dma_addr
);
1143 return ERR_PTR(result
);
1146 static int nvme_wait_ready(struct nvme_dev
*dev
, u64 cap
, bool enabled
)
1148 unsigned long timeout
;
1149 u32 bit
= enabled
? NVME_CSTS_RDY
: 0;
1151 timeout
= ((NVME_CAP_TIMEOUT(cap
) + 1) * HZ
/ 2) + jiffies
;
1153 while ((readl(&dev
->bar
->csts
) & NVME_CSTS_RDY
) != bit
) {
1155 if (fatal_signal_pending(current
))
1157 if (time_after(jiffies
, timeout
)) {
1158 dev_err(&dev
->pci_dev
->dev
,
1159 "Device not ready; aborting initialisation\n");
1168 * If the device has been passed off to us in an enabled state, just clear
1169 * the enabled bit. The spec says we should set the 'shutdown notification
1170 * bits', but doing so may cause the device to complete commands to the
1171 * admin queue ... and we don't know what memory that might be pointing at!
1173 static int nvme_disable_ctrl(struct nvme_dev
*dev
, u64 cap
)
1175 u32 cc
= readl(&dev
->bar
->cc
);
1177 if (cc
& NVME_CC_ENABLE
)
1178 writel(cc
& ~NVME_CC_ENABLE
, &dev
->bar
->cc
);
1179 return nvme_wait_ready(dev
, cap
, false);
1182 static int nvme_enable_ctrl(struct nvme_dev
*dev
, u64 cap
)
1184 return nvme_wait_ready(dev
, cap
, true);
1187 static int nvme_configure_admin_queue(struct nvme_dev
*dev
)
1191 u64 cap
= readq(&dev
->bar
->cap
);
1192 struct nvme_queue
*nvmeq
;
1194 dev
->dbs
= ((void __iomem
*)dev
->bar
) + 4096;
1195 dev
->db_stride
= NVME_CAP_STRIDE(cap
);
1197 result
= nvme_disable_ctrl(dev
, cap
);
1201 nvmeq
= nvme_alloc_queue(dev
, 0, 64, 0);
1205 aqa
= nvmeq
->q_depth
- 1;
1208 dev
->ctrl_config
= NVME_CC_ENABLE
| NVME_CC_CSS_NVM
;
1209 dev
->ctrl_config
|= (PAGE_SHIFT
- 12) << NVME_CC_MPS_SHIFT
;
1210 dev
->ctrl_config
|= NVME_CC_ARB_RR
| NVME_CC_SHN_NONE
;
1211 dev
->ctrl_config
|= NVME_CC_IOSQES
| NVME_CC_IOCQES
;
1213 writel(aqa
, &dev
->bar
->aqa
);
1214 writeq(nvmeq
->sq_dma_addr
, &dev
->bar
->asq
);
1215 writeq(nvmeq
->cq_dma_addr
, &dev
->bar
->acq
);
1216 writel(dev
->ctrl_config
, &dev
->bar
->cc
);
1218 result
= nvme_enable_ctrl(dev
, cap
);
1222 result
= queue_request_irq(dev
, nvmeq
, "nvme admin");
1226 dev
->queues
[0] = nvmeq
;
1230 nvme_free_queue_mem(nvmeq
);
1234 struct nvme_iod
*nvme_map_user_pages(struct nvme_dev
*dev
, int write
,
1235 unsigned long addr
, unsigned length
)
1237 int i
, err
, count
, nents
, offset
;
1238 struct scatterlist
*sg
;
1239 struct page
**pages
;
1240 struct nvme_iod
*iod
;
1243 return ERR_PTR(-EINVAL
);
1244 if (!length
|| length
> INT_MAX
- PAGE_SIZE
)
1245 return ERR_PTR(-EINVAL
);
1247 offset
= offset_in_page(addr
);
1248 count
= DIV_ROUND_UP(offset
+ length
, PAGE_SIZE
);
1249 pages
= kcalloc(count
, sizeof(*pages
), GFP_KERNEL
);
1251 return ERR_PTR(-ENOMEM
);
1253 err
= get_user_pages_fast(addr
, count
, 1, pages
);
1260 iod
= nvme_alloc_iod(count
, length
, GFP_KERNEL
);
1262 sg_init_table(sg
, count
);
1263 for (i
= 0; i
< count
; i
++) {
1264 sg_set_page(&sg
[i
], pages
[i
],
1265 min_t(unsigned, length
, PAGE_SIZE
- offset
),
1267 length
-= (PAGE_SIZE
- offset
);
1270 sg_mark_end(&sg
[i
- 1]);
1274 nents
= dma_map_sg(&dev
->pci_dev
->dev
, sg
, count
,
1275 write
? DMA_TO_DEVICE
: DMA_FROM_DEVICE
);
1285 for (i
= 0; i
< count
; i
++)
1288 return ERR_PTR(err
);
1291 void nvme_unmap_user_pages(struct nvme_dev
*dev
, int write
,
1292 struct nvme_iod
*iod
)
1296 dma_unmap_sg(&dev
->pci_dev
->dev
, iod
->sg
, iod
->nents
,
1297 write
? DMA_TO_DEVICE
: DMA_FROM_DEVICE
);
1299 for (i
= 0; i
< iod
->nents
; i
++)
1300 put_page(sg_page(&iod
->sg
[i
]));
1303 static int nvme_submit_io(struct nvme_ns
*ns
, struct nvme_user_io __user
*uio
)
1305 struct nvme_dev
*dev
= ns
->dev
;
1306 struct nvme_queue
*nvmeq
;
1307 struct nvme_user_io io
;
1308 struct nvme_command c
;
1309 unsigned length
, meta_len
;
1311 struct nvme_iod
*iod
, *meta_iod
= NULL
;
1312 dma_addr_t meta_dma_addr
;
1313 void *meta
, *uninitialized_var(meta_mem
);
1315 if (copy_from_user(&io
, uio
, sizeof(io
)))
1317 length
= (io
.nblocks
+ 1) << ns
->lba_shift
;
1318 meta_len
= (io
.nblocks
+ 1) * ns
->ms
;
1320 if (meta_len
&& ((io
.metadata
& 3) || !io
.metadata
))
1323 switch (io
.opcode
) {
1324 case nvme_cmd_write
:
1326 case nvme_cmd_compare
:
1327 iod
= nvme_map_user_pages(dev
, io
.opcode
& 1, io
.addr
, length
);
1334 return PTR_ERR(iod
);
1336 memset(&c
, 0, sizeof(c
));
1337 c
.rw
.opcode
= io
.opcode
;
1338 c
.rw
.flags
= io
.flags
;
1339 c
.rw
.nsid
= cpu_to_le32(ns
->ns_id
);
1340 c
.rw
.slba
= cpu_to_le64(io
.slba
);
1341 c
.rw
.length
= cpu_to_le16(io
.nblocks
);
1342 c
.rw
.control
= cpu_to_le16(io
.control
);
1343 c
.rw
.dsmgmt
= cpu_to_le32(io
.dsmgmt
);
1344 c
.rw
.reftag
= cpu_to_le32(io
.reftag
);
1345 c
.rw
.apptag
= cpu_to_le16(io
.apptag
);
1346 c
.rw
.appmask
= cpu_to_le16(io
.appmask
);
1349 meta_iod
= nvme_map_user_pages(dev
, io
.opcode
& 1, io
.metadata
,
1351 if (IS_ERR(meta_iod
)) {
1352 status
= PTR_ERR(meta_iod
);
1357 meta_mem
= dma_alloc_coherent(&dev
->pci_dev
->dev
, meta_len
,
1358 &meta_dma_addr
, GFP_KERNEL
);
1364 if (io
.opcode
& 1) {
1365 int meta_offset
= 0;
1367 for (i
= 0; i
< meta_iod
->nents
; i
++) {
1368 meta
= kmap_atomic(sg_page(&meta_iod
->sg
[i
])) +
1369 meta_iod
->sg
[i
].offset
;
1370 memcpy(meta_mem
+ meta_offset
, meta
,
1371 meta_iod
->sg
[i
].length
);
1372 kunmap_atomic(meta
);
1373 meta_offset
+= meta_iod
->sg
[i
].length
;
1377 c
.rw
.metadata
= cpu_to_le64(meta_dma_addr
);
1380 length
= nvme_setup_prps(dev
, &c
.common
, iod
, length
, GFP_KERNEL
);
1382 nvmeq
= get_nvmeq(dev
);
1384 * Since nvme_submit_sync_cmd sleeps, we can't keep preemption
1385 * disabled. We may be preempted at any point, and be rescheduled
1386 * to a different CPU. That will cause cacheline bouncing, but no
1387 * additional races since q_lock already protects against other CPUs.
1390 if (length
!= (io
.nblocks
+ 1) << ns
->lba_shift
)
1393 status
= nvme_submit_sync_cmd(nvmeq
, &c
, NULL
, NVME_IO_TIMEOUT
);
1396 if (status
== NVME_SC_SUCCESS
&& !(io
.opcode
& 1)) {
1397 int meta_offset
= 0;
1399 for (i
= 0; i
< meta_iod
->nents
; i
++) {
1400 meta
= kmap_atomic(sg_page(&meta_iod
->sg
[i
])) +
1401 meta_iod
->sg
[i
].offset
;
1402 memcpy(meta
, meta_mem
+ meta_offset
,
1403 meta_iod
->sg
[i
].length
);
1404 kunmap_atomic(meta
);
1405 meta_offset
+= meta_iod
->sg
[i
].length
;
1409 dma_free_coherent(&dev
->pci_dev
->dev
, meta_len
, meta_mem
,
1414 nvme_unmap_user_pages(dev
, io
.opcode
& 1, iod
);
1415 nvme_free_iod(dev
, iod
);
1418 nvme_unmap_user_pages(dev
, io
.opcode
& 1, meta_iod
);
1419 nvme_free_iod(dev
, meta_iod
);
1425 static int nvme_user_admin_cmd(struct nvme_dev
*dev
,
1426 struct nvme_admin_cmd __user
*ucmd
)
1428 struct nvme_admin_cmd cmd
;
1429 struct nvme_command c
;
1431 struct nvme_iod
*uninitialized_var(iod
);
1434 if (!capable(CAP_SYS_ADMIN
))
1436 if (copy_from_user(&cmd
, ucmd
, sizeof(cmd
)))
1439 memset(&c
, 0, sizeof(c
));
1440 c
.common
.opcode
= cmd
.opcode
;
1441 c
.common
.flags
= cmd
.flags
;
1442 c
.common
.nsid
= cpu_to_le32(cmd
.nsid
);
1443 c
.common
.cdw2
[0] = cpu_to_le32(cmd
.cdw2
);
1444 c
.common
.cdw2
[1] = cpu_to_le32(cmd
.cdw3
);
1445 c
.common
.cdw10
[0] = cpu_to_le32(cmd
.cdw10
);
1446 c
.common
.cdw10
[1] = cpu_to_le32(cmd
.cdw11
);
1447 c
.common
.cdw10
[2] = cpu_to_le32(cmd
.cdw12
);
1448 c
.common
.cdw10
[3] = cpu_to_le32(cmd
.cdw13
);
1449 c
.common
.cdw10
[4] = cpu_to_le32(cmd
.cdw14
);
1450 c
.common
.cdw10
[5] = cpu_to_le32(cmd
.cdw15
);
1452 length
= cmd
.data_len
;
1454 iod
= nvme_map_user_pages(dev
, cmd
.opcode
& 1, cmd
.addr
,
1457 return PTR_ERR(iod
);
1458 length
= nvme_setup_prps(dev
, &c
.common
, iod
, length
,
1462 timeout
= cmd
.timeout_ms
? msecs_to_jiffies(cmd
.timeout_ms
) :
1464 if (length
!= cmd
.data_len
)
1467 status
= nvme_submit_sync_cmd(dev
->queues
[0], &c
, &cmd
.result
,
1471 nvme_unmap_user_pages(dev
, cmd
.opcode
& 1, iod
);
1472 nvme_free_iod(dev
, iod
);
1475 if ((status
>= 0) && copy_to_user(&ucmd
->result
, &cmd
.result
,
1476 sizeof(cmd
.result
)))
1482 static int nvme_ioctl(struct block_device
*bdev
, fmode_t mode
, unsigned int cmd
,
1485 struct nvme_ns
*ns
= bdev
->bd_disk
->private_data
;
1489 force_successful_syscall_return();
1491 case NVME_IOCTL_ADMIN_CMD
:
1492 return nvme_user_admin_cmd(ns
->dev
, (void __user
*)arg
);
1493 case NVME_IOCTL_SUBMIT_IO
:
1494 return nvme_submit_io(ns
, (void __user
*)arg
);
1495 case SG_GET_VERSION_NUM
:
1496 return nvme_sg_get_version_num((void __user
*)arg
);
1498 return nvme_sg_io(ns
, (void __user
*)arg
);
1504 static const struct block_device_operations nvme_fops
= {
1505 .owner
= THIS_MODULE
,
1506 .ioctl
= nvme_ioctl
,
1507 .compat_ioctl
= nvme_ioctl
,
1510 static void nvme_resubmit_bios(struct nvme_queue
*nvmeq
)
1512 while (bio_list_peek(&nvmeq
->sq_cong
)) {
1513 struct bio
*bio
= bio_list_pop(&nvmeq
->sq_cong
);
1514 struct nvme_ns
*ns
= bio
->bi_bdev
->bd_disk
->private_data
;
1516 if (bio_list_empty(&nvmeq
->sq_cong
))
1517 remove_wait_queue(&nvmeq
->sq_full
,
1518 &nvmeq
->sq_cong_wait
);
1519 if (nvme_submit_bio_queue(nvmeq
, ns
, bio
)) {
1520 if (bio_list_empty(&nvmeq
->sq_cong
))
1521 add_wait_queue(&nvmeq
->sq_full
,
1522 &nvmeq
->sq_cong_wait
);
1523 bio_list_add_head(&nvmeq
->sq_cong
, bio
);
1529 static int nvme_kthread(void *data
)
1531 struct nvme_dev
*dev
;
1533 while (!kthread_should_stop()) {
1534 set_current_state(TASK_INTERRUPTIBLE
);
1535 spin_lock(&dev_list_lock
);
1536 list_for_each_entry(dev
, &dev_list
, node
) {
1538 for (i
= 0; i
< dev
->queue_count
; i
++) {
1539 struct nvme_queue
*nvmeq
= dev
->queues
[i
];
1542 spin_lock_irq(&nvmeq
->q_lock
);
1543 nvme_process_cq(nvmeq
);
1544 nvme_cancel_ios(nvmeq
, true);
1545 nvme_resubmit_bios(nvmeq
);
1546 spin_unlock_irq(&nvmeq
->q_lock
);
1549 spin_unlock(&dev_list_lock
);
1550 schedule_timeout(round_jiffies_relative(HZ
));
1555 static DEFINE_IDA(nvme_index_ida
);
1557 static int nvme_get_ns_idx(void)
1562 if (!ida_pre_get(&nvme_index_ida
, GFP_KERNEL
))
1565 spin_lock(&dev_list_lock
);
1566 error
= ida_get_new(&nvme_index_ida
, &index
);
1567 spin_unlock(&dev_list_lock
);
1568 } while (error
== -EAGAIN
);
1575 static void nvme_put_ns_idx(int index
)
1577 spin_lock(&dev_list_lock
);
1578 ida_remove(&nvme_index_ida
, index
);
1579 spin_unlock(&dev_list_lock
);
1582 static void nvme_config_discard(struct nvme_ns
*ns
)
1584 u32 logical_block_size
= queue_logical_block_size(ns
->queue
);
1585 ns
->queue
->limits
.discard_zeroes_data
= 0;
1586 ns
->queue
->limits
.discard_alignment
= logical_block_size
;
1587 ns
->queue
->limits
.discard_granularity
= logical_block_size
;
1588 ns
->queue
->limits
.max_discard_sectors
= 0xffffffff;
1589 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, ns
->queue
);
1592 static struct nvme_ns
*nvme_alloc_ns(struct nvme_dev
*dev
, unsigned nsid
,
1593 struct nvme_id_ns
*id
, struct nvme_lba_range_type
*rt
)
1596 struct gendisk
*disk
;
1599 if (rt
->attributes
& NVME_LBART_ATTRIB_HIDE
)
1602 ns
= kzalloc(sizeof(*ns
), GFP_KERNEL
);
1605 ns
->queue
= blk_alloc_queue(GFP_KERNEL
);
1608 ns
->queue
->queue_flags
= QUEUE_FLAG_DEFAULT
;
1609 queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES
, ns
->queue
);
1610 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, ns
->queue
);
1611 blk_queue_make_request(ns
->queue
, nvme_make_request
);
1613 ns
->queue
->queuedata
= ns
;
1615 disk
= alloc_disk(NVME_MINORS
);
1617 goto out_free_queue
;
1620 lbaf
= id
->flbas
& 0xf;
1621 ns
->lba_shift
= id
->lbaf
[lbaf
].ds
;
1622 ns
->ms
= le16_to_cpu(id
->lbaf
[lbaf
].ms
);
1623 blk_queue_logical_block_size(ns
->queue
, 1 << ns
->lba_shift
);
1624 if (dev
->max_hw_sectors
)
1625 blk_queue_max_hw_sectors(ns
->queue
, dev
->max_hw_sectors
);
1627 disk
->major
= nvme_major
;
1628 disk
->minors
= NVME_MINORS
;
1629 disk
->first_minor
= NVME_MINORS
* nvme_get_ns_idx();
1630 disk
->fops
= &nvme_fops
;
1631 disk
->private_data
= ns
;
1632 disk
->queue
= ns
->queue
;
1633 disk
->driverfs_dev
= &dev
->pci_dev
->dev
;
1634 sprintf(disk
->disk_name
, "nvme%dn%d", dev
->instance
, nsid
);
1635 set_capacity(disk
, le64_to_cpup(&id
->nsze
) << (ns
->lba_shift
- 9));
1637 if (dev
->oncs
& NVME_CTRL_ONCS_DSM
)
1638 nvme_config_discard(ns
);
1643 blk_cleanup_queue(ns
->queue
);
1649 static void nvme_ns_free(struct nvme_ns
*ns
)
1651 int index
= ns
->disk
->first_minor
/ NVME_MINORS
;
1653 nvme_put_ns_idx(index
);
1654 blk_cleanup_queue(ns
->queue
);
1658 static int set_queue_count(struct nvme_dev
*dev
, int count
)
1662 u32 q_count
= (count
- 1) | ((count
- 1) << 16);
1664 status
= nvme_set_features(dev
, NVME_FEAT_NUM_QUEUES
, q_count
, 0,
1667 return status
< 0 ? -EIO
: -EBUSY
;
1668 return min(result
& 0xffff, result
>> 16) + 1;
1671 static int nvme_setup_io_queues(struct nvme_dev
*dev
)
1673 struct pci_dev
*pdev
= dev
->pci_dev
;
1674 int result
, cpu
, i
, vecs
, nr_io_queues
, db_bar_size
, q_depth
;
1676 nr_io_queues
= num_online_cpus();
1677 result
= set_queue_count(dev
, nr_io_queues
);
1680 if (result
< nr_io_queues
)
1681 nr_io_queues
= result
;
1683 /* Deregister the admin queue's interrupt */
1684 free_irq(dev
->entry
[0].vector
, dev
->queues
[0]);
1686 db_bar_size
= 4096 + ((nr_io_queues
+ 1) << (dev
->db_stride
+ 3));
1687 if (db_bar_size
> 8192) {
1689 dev
->bar
= ioremap(pci_resource_start(pdev
, 0), db_bar_size
);
1690 dev
->dbs
= ((void __iomem
*)dev
->bar
) + 4096;
1691 dev
->queues
[0]->q_db
= dev
->dbs
;
1694 vecs
= nr_io_queues
;
1695 for (i
= 0; i
< vecs
; i
++)
1696 dev
->entry
[i
].entry
= i
;
1698 result
= pci_enable_msix(pdev
, dev
->entry
, vecs
);
1705 vecs
= nr_io_queues
;
1709 result
= pci_enable_msi_block(pdev
, vecs
);
1711 for (i
= 0; i
< vecs
; i
++)
1712 dev
->entry
[i
].vector
= i
+ pdev
->irq
;
1714 } else if (result
< 0) {
1723 * Should investigate if there's a performance win from allocating
1724 * more queues than interrupt vectors; it might allow the submission
1725 * path to scale better, even if the receive path is limited by the
1726 * number of interrupts.
1728 nr_io_queues
= vecs
;
1730 result
= queue_request_irq(dev
, dev
->queues
[0], "nvme admin");
1731 /* XXX: handle failure here */
1733 cpu
= cpumask_first(cpu_online_mask
);
1734 for (i
= 0; i
< nr_io_queues
; i
++) {
1735 irq_set_affinity_hint(dev
->entry
[i
].vector
, get_cpu_mask(cpu
));
1736 cpu
= cpumask_next(cpu
, cpu_online_mask
);
1739 q_depth
= min_t(int, NVME_CAP_MQES(readq(&dev
->bar
->cap
)) + 1,
1741 for (i
= 0; i
< nr_io_queues
; i
++) {
1742 dev
->queues
[i
+ 1] = nvme_create_queue(dev
, i
+ 1, q_depth
, i
);
1743 if (IS_ERR(dev
->queues
[i
+ 1]))
1744 return PTR_ERR(dev
->queues
[i
+ 1]);
1748 for (; i
< num_possible_cpus(); i
++) {
1749 int target
= i
% rounddown_pow_of_two(dev
->queue_count
- 1);
1750 dev
->queues
[i
+ 1] = dev
->queues
[target
+ 1];
1756 static void nvme_free_queues(struct nvme_dev
*dev
)
1760 for (i
= dev
->queue_count
- 1; i
>= 0; i
--)
1761 nvme_free_queue(dev
, i
);
1765 * Return: error value if an error occurred setting up the queues or calling
1766 * Identify Device. 0 if these succeeded, even if adding some of the
1767 * namespaces failed. At the moment, these failures are silent. TBD which
1768 * failures should be reported.
1770 static int nvme_dev_add(struct nvme_dev
*dev
)
1775 struct nvme_id_ctrl
*ctrl
;
1776 struct nvme_id_ns
*id_ns
;
1778 dma_addr_t dma_addr
;
1779 int shift
= NVME_CAP_MPSMIN(readq(&dev
->bar
->cap
)) + 12;
1781 res
= nvme_setup_io_queues(dev
);
1785 mem
= dma_alloc_coherent(&dev
->pci_dev
->dev
, 8192, &dma_addr
,
1790 res
= nvme_identify(dev
, 0, 1, dma_addr
);
1797 nn
= le32_to_cpup(&ctrl
->nn
);
1798 dev
->oncs
= le16_to_cpup(&ctrl
->oncs
);
1799 memcpy(dev
->serial
, ctrl
->sn
, sizeof(ctrl
->sn
));
1800 memcpy(dev
->model
, ctrl
->mn
, sizeof(ctrl
->mn
));
1801 memcpy(dev
->firmware_rev
, ctrl
->fr
, sizeof(ctrl
->fr
));
1803 dev
->max_hw_sectors
= 1 << (ctrl
->mdts
+ shift
- 9);
1804 if ((dev
->pci_dev
->vendor
== PCI_VENDOR_ID_INTEL
) &&
1805 (dev
->pci_dev
->device
== 0x0953) && ctrl
->vs
[3])
1806 dev
->stripe_size
= 1 << (ctrl
->vs
[3] + shift
);
1809 for (i
= 1; i
<= nn
; i
++) {
1810 res
= nvme_identify(dev
, i
, 0, dma_addr
);
1814 if (id_ns
->ncap
== 0)
1817 res
= nvme_get_features(dev
, NVME_FEAT_LBA_RANGE
, i
,
1818 dma_addr
+ 4096, NULL
);
1820 memset(mem
+ 4096, 0, 4096);
1822 ns
= nvme_alloc_ns(dev
, i
, mem
, mem
+ 4096);
1824 list_add_tail(&ns
->list
, &dev
->namespaces
);
1826 list_for_each_entry(ns
, &dev
->namespaces
, list
)
1831 dma_free_coherent(&dev
->pci_dev
->dev
, 8192, mem
, dma_addr
);
1835 static int nvme_dev_remove(struct nvme_dev
*dev
)
1837 struct nvme_ns
*ns
, *next
;
1839 spin_lock(&dev_list_lock
);
1840 list_del(&dev
->node
);
1841 spin_unlock(&dev_list_lock
);
1843 list_for_each_entry_safe(ns
, next
, &dev
->namespaces
, list
) {
1844 list_del(&ns
->list
);
1845 del_gendisk(ns
->disk
);
1849 nvme_free_queues(dev
);
1854 static int nvme_setup_prp_pools(struct nvme_dev
*dev
)
1856 struct device
*dmadev
= &dev
->pci_dev
->dev
;
1857 dev
->prp_page_pool
= dma_pool_create("prp list page", dmadev
,
1858 PAGE_SIZE
, PAGE_SIZE
, 0);
1859 if (!dev
->prp_page_pool
)
1862 /* Optimisation for I/Os between 4k and 128k */
1863 dev
->prp_small_pool
= dma_pool_create("prp list 256", dmadev
,
1865 if (!dev
->prp_small_pool
) {
1866 dma_pool_destroy(dev
->prp_page_pool
);
1872 static void nvme_release_prp_pools(struct nvme_dev
*dev
)
1874 dma_pool_destroy(dev
->prp_page_pool
);
1875 dma_pool_destroy(dev
->prp_small_pool
);
1878 static DEFINE_IDA(nvme_instance_ida
);
1880 static int nvme_set_instance(struct nvme_dev
*dev
)
1882 int instance
, error
;
1885 if (!ida_pre_get(&nvme_instance_ida
, GFP_KERNEL
))
1888 spin_lock(&dev_list_lock
);
1889 error
= ida_get_new(&nvme_instance_ida
, &instance
);
1890 spin_unlock(&dev_list_lock
);
1891 } while (error
== -EAGAIN
);
1896 dev
->instance
= instance
;
1900 static void nvme_release_instance(struct nvme_dev
*dev
)
1902 spin_lock(&dev_list_lock
);
1903 ida_remove(&nvme_instance_ida
, dev
->instance
);
1904 spin_unlock(&dev_list_lock
);
1907 static void nvme_free_dev(struct kref
*kref
)
1909 struct nvme_dev
*dev
= container_of(kref
, struct nvme_dev
, kref
);
1910 nvme_dev_remove(dev
);
1911 if (dev
->pci_dev
->msi_enabled
)
1912 pci_disable_msi(dev
->pci_dev
);
1913 else if (dev
->pci_dev
->msix_enabled
)
1914 pci_disable_msix(dev
->pci_dev
);
1916 nvme_release_instance(dev
);
1917 nvme_release_prp_pools(dev
);
1918 pci_disable_device(dev
->pci_dev
);
1919 pci_release_regions(dev
->pci_dev
);
1925 static int nvme_dev_open(struct inode
*inode
, struct file
*f
)
1927 struct nvme_dev
*dev
= container_of(f
->private_data
, struct nvme_dev
,
1929 kref_get(&dev
->kref
);
1930 f
->private_data
= dev
;
1934 static int nvme_dev_release(struct inode
*inode
, struct file
*f
)
1936 struct nvme_dev
*dev
= f
->private_data
;
1937 kref_put(&dev
->kref
, nvme_free_dev
);
1941 static long nvme_dev_ioctl(struct file
*f
, unsigned int cmd
, unsigned long arg
)
1943 struct nvme_dev
*dev
= f
->private_data
;
1945 case NVME_IOCTL_ADMIN_CMD
:
1946 return nvme_user_admin_cmd(dev
, (void __user
*)arg
);
1952 static const struct file_operations nvme_dev_fops
= {
1953 .owner
= THIS_MODULE
,
1954 .open
= nvme_dev_open
,
1955 .release
= nvme_dev_release
,
1956 .unlocked_ioctl
= nvme_dev_ioctl
,
1957 .compat_ioctl
= nvme_dev_ioctl
,
1960 static int nvme_probe(struct pci_dev
*pdev
, const struct pci_device_id
*id
)
1962 int bars
, result
= -ENOMEM
;
1963 struct nvme_dev
*dev
;
1965 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
1968 dev
->entry
= kcalloc(num_possible_cpus(), sizeof(*dev
->entry
),
1972 dev
->queues
= kcalloc(num_possible_cpus() + 1, sizeof(void *),
1977 if (pci_enable_device_mem(pdev
))
1979 pci_set_master(pdev
);
1980 bars
= pci_select_bars(pdev
, IORESOURCE_MEM
);
1981 if (pci_request_selected_regions(pdev
, bars
, "nvme"))
1984 INIT_LIST_HEAD(&dev
->namespaces
);
1985 dev
->pci_dev
= pdev
;
1986 pci_set_drvdata(pdev
, dev
);
1988 if (!dma_set_mask(&pdev
->dev
, DMA_BIT_MASK(64)))
1989 dma_set_coherent_mask(&pdev
->dev
, DMA_BIT_MASK(64));
1990 else if (!dma_set_mask(&pdev
->dev
, DMA_BIT_MASK(32)))
1991 dma_set_coherent_mask(&pdev
->dev
, DMA_BIT_MASK(32));
1995 result
= nvme_set_instance(dev
);
1999 dev
->entry
[0].vector
= pdev
->irq
;
2001 result
= nvme_setup_prp_pools(dev
);
2005 dev
->bar
= ioremap(pci_resource_start(pdev
, 0), 8192);
2011 result
= nvme_configure_admin_queue(dev
);
2016 spin_lock(&dev_list_lock
);
2017 list_add(&dev
->node
, &dev_list
);
2018 spin_unlock(&dev_list_lock
);
2020 result
= nvme_dev_add(dev
);
2021 if (result
&& result
!= -EBUSY
)
2024 scnprintf(dev
->name
, sizeof(dev
->name
), "nvme%d", dev
->instance
);
2025 dev
->miscdev
.minor
= MISC_DYNAMIC_MINOR
;
2026 dev
->miscdev
.parent
= &pdev
->dev
;
2027 dev
->miscdev
.name
= dev
->name
;
2028 dev
->miscdev
.fops
= &nvme_dev_fops
;
2029 result
= misc_register(&dev
->miscdev
);
2033 kref_init(&dev
->kref
);
2037 nvme_dev_remove(dev
);
2039 spin_lock(&dev_list_lock
);
2040 list_del(&dev
->node
);
2041 spin_unlock(&dev_list_lock
);
2043 nvme_free_queues(dev
);
2047 if (dev
->pci_dev
->msi_enabled
)
2048 pci_disable_msi(dev
->pci_dev
);
2049 else if (dev
->pci_dev
->msix_enabled
)
2050 pci_disable_msix(dev
->pci_dev
);
2051 nvme_release_instance(dev
);
2052 nvme_release_prp_pools(dev
);
2054 pci_disable_device(pdev
);
2055 pci_release_regions(pdev
);
2063 static void nvme_remove(struct pci_dev
*pdev
)
2065 struct nvme_dev
*dev
= pci_get_drvdata(pdev
);
2066 misc_deregister(&dev
->miscdev
);
2067 kref_put(&dev
->kref
, nvme_free_dev
);
2070 /* These functions are yet to be implemented */
2071 #define nvme_error_detected NULL
2072 #define nvme_dump_registers NULL
2073 #define nvme_link_reset NULL
2074 #define nvme_slot_reset NULL
2075 #define nvme_error_resume NULL
2076 #define nvme_suspend NULL
2077 #define nvme_resume NULL
2079 static const struct pci_error_handlers nvme_err_handler
= {
2080 .error_detected
= nvme_error_detected
,
2081 .mmio_enabled
= nvme_dump_registers
,
2082 .link_reset
= nvme_link_reset
,
2083 .slot_reset
= nvme_slot_reset
,
2084 .resume
= nvme_error_resume
,
2087 /* Move to pci_ids.h later */
2088 #define PCI_CLASS_STORAGE_EXPRESS 0x010802
2090 static DEFINE_PCI_DEVICE_TABLE(nvme_id_table
) = {
2091 { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS
, 0xffffff) },
2094 MODULE_DEVICE_TABLE(pci
, nvme_id_table
);
2096 static struct pci_driver nvme_driver
= {
2098 .id_table
= nvme_id_table
,
2099 .probe
= nvme_probe
,
2100 .remove
= nvme_remove
,
2101 .suspend
= nvme_suspend
,
2102 .resume
= nvme_resume
,
2103 .err_handler
= &nvme_err_handler
,
2106 static int __init
nvme_init(void)
2110 nvme_thread
= kthread_run(nvme_kthread
, NULL
, "nvme");
2111 if (IS_ERR(nvme_thread
))
2112 return PTR_ERR(nvme_thread
);
2114 result
= register_blkdev(nvme_major
, "nvme");
2117 else if (result
> 0)
2118 nvme_major
= result
;
2120 result
= pci_register_driver(&nvme_driver
);
2122 goto unregister_blkdev
;
2126 unregister_blkdev(nvme_major
, "nvme");
2128 kthread_stop(nvme_thread
);
2132 static void __exit
nvme_exit(void)
2134 pci_unregister_driver(&nvme_driver
);
2135 unregister_blkdev(nvme_major
, "nvme");
2136 kthread_stop(nvme_thread
);
2139 MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>");
2140 MODULE_LICENSE("GPL");
2141 MODULE_VERSION("0.8");
2142 module_init(nvme_init
);
2143 module_exit(nvme_exit
);