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/nvme.h>
16 #include <linux/bio.h>
17 #include <linux/bitops.h>
18 #include <linux/blkdev.h>
19 #include <linux/cpu.h>
20 #include <linux/delay.h>
21 #include <linux/errno.h>
23 #include <linux/genhd.h>
24 #include <linux/hdreg.h>
25 #include <linux/idr.h>
26 #include <linux/init.h>
27 #include <linux/interrupt.h>
29 #include <linux/kdev_t.h>
30 #include <linux/kthread.h>
31 #include <linux/kernel.h>
33 #include <linux/module.h>
34 #include <linux/moduleparam.h>
35 #include <linux/pci.h>
36 #include <linux/percpu.h>
37 #include <linux/poison.h>
38 #include <linux/ptrace.h>
39 #include <linux/sched.h>
40 #include <linux/slab.h>
41 #include <linux/types.h>
43 #include <asm-generic/io-64-nonatomic-lo-hi.h>
45 #include <trace/events/block.h>
47 #define NVME_Q_DEPTH 1024
48 #define SQ_SIZE(depth) (depth * sizeof(struct nvme_command))
49 #define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion))
50 #define ADMIN_TIMEOUT (admin_timeout * HZ)
51 #define IOD_TIMEOUT (retry_time * HZ)
53 static unsigned char admin_timeout
= 60;
54 module_param(admin_timeout
, byte
, 0644);
55 MODULE_PARM_DESC(admin_timeout
, "timeout in seconds for admin commands");
57 unsigned char nvme_io_timeout
= 30;
58 module_param_named(io_timeout
, nvme_io_timeout
, byte
, 0644);
59 MODULE_PARM_DESC(io_timeout
, "timeout in seconds for I/O");
61 static unsigned char retry_time
= 30;
62 module_param(retry_time
, byte
, 0644);
63 MODULE_PARM_DESC(retry_time
, "time in seconds to retry failed I/O");
65 static int nvme_major
;
66 module_param(nvme_major
, int, 0);
68 static int use_threaded_interrupts
;
69 module_param(use_threaded_interrupts
, int, 0);
71 static DEFINE_SPINLOCK(dev_list_lock
);
72 static LIST_HEAD(dev_list
);
73 static struct task_struct
*nvme_thread
;
74 static struct workqueue_struct
*nvme_workq
;
75 static wait_queue_head_t nvme_kthread_wait
;
76 static struct notifier_block nvme_nb
;
78 static void nvme_reset_failed_dev(struct work_struct
*ws
);
80 struct async_cmd_info
{
81 struct kthread_work work
;
82 struct kthread_worker
*worker
;
89 * An NVM Express queue. Each device has at least two (one for admin
90 * commands and one for I/O commands).
93 struct rcu_head r_head
;
94 struct device
*q_dmadev
;
96 char irqname
[24]; /* nvme4294967295-65535\0 */
98 struct nvme_command
*sq_cmds
;
99 volatile struct nvme_completion
*cqes
;
100 dma_addr_t sq_dma_addr
;
101 dma_addr_t cq_dma_addr
;
102 wait_queue_head_t sq_full
;
103 wait_queue_t sq_cong_wait
;
104 struct bio_list sq_cong
;
105 struct list_head iod_bio
;
116 cpumask_var_t cpu_mask
;
117 struct async_cmd_info cmdinfo
;
118 unsigned long cmdid_data
[];
122 * Check we didin't inadvertently grow the command struct
124 static inline void _nvme_check_size(void)
126 BUILD_BUG_ON(sizeof(struct nvme_rw_command
) != 64);
127 BUILD_BUG_ON(sizeof(struct nvme_create_cq
) != 64);
128 BUILD_BUG_ON(sizeof(struct nvme_create_sq
) != 64);
129 BUILD_BUG_ON(sizeof(struct nvme_delete_queue
) != 64);
130 BUILD_BUG_ON(sizeof(struct nvme_features
) != 64);
131 BUILD_BUG_ON(sizeof(struct nvme_format_cmd
) != 64);
132 BUILD_BUG_ON(sizeof(struct nvme_abort_cmd
) != 64);
133 BUILD_BUG_ON(sizeof(struct nvme_command
) != 64);
134 BUILD_BUG_ON(sizeof(struct nvme_id_ctrl
) != 4096);
135 BUILD_BUG_ON(sizeof(struct nvme_id_ns
) != 4096);
136 BUILD_BUG_ON(sizeof(struct nvme_lba_range_type
) != 64);
137 BUILD_BUG_ON(sizeof(struct nvme_smart_log
) != 512);
140 typedef void (*nvme_completion_fn
)(struct nvme_queue
*, void *,
141 struct nvme_completion
*);
143 struct nvme_cmd_info
{
144 nvme_completion_fn fn
;
146 unsigned long timeout
;
150 static struct nvme_cmd_info
*nvme_cmd_info(struct nvme_queue
*nvmeq
)
152 return (void *)&nvmeq
->cmdid_data
[BITS_TO_LONGS(nvmeq
->q_depth
)];
155 static unsigned nvme_queue_extra(int depth
)
157 return DIV_ROUND_UP(depth
, 8) + (depth
* sizeof(struct nvme_cmd_info
));
161 * alloc_cmdid() - Allocate a Command ID
162 * @nvmeq: The queue that will be used for this command
163 * @ctx: A pointer that will be passed to the handler
164 * @handler: The function to call on completion
166 * Allocate a Command ID for a queue. The data passed in will
167 * be passed to the completion handler. This is implemented by using
168 * the bottom two bits of the ctx pointer to store the handler ID.
169 * Passing in a pointer that's not 4-byte aligned will cause a BUG.
170 * We can change this if it becomes a problem.
172 * May be called with local interrupts disabled and the q_lock held,
173 * or with interrupts enabled and no locks held.
175 static int alloc_cmdid(struct nvme_queue
*nvmeq
, void *ctx
,
176 nvme_completion_fn handler
, unsigned timeout
)
178 int depth
= nvmeq
->q_depth
- 1;
179 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
183 cmdid
= find_first_zero_bit(nvmeq
->cmdid_data
, depth
);
186 } while (test_and_set_bit(cmdid
, nvmeq
->cmdid_data
));
188 info
[cmdid
].fn
= handler
;
189 info
[cmdid
].ctx
= ctx
;
190 info
[cmdid
].timeout
= jiffies
+ timeout
;
191 info
[cmdid
].aborted
= 0;
195 static int alloc_cmdid_killable(struct nvme_queue
*nvmeq
, void *ctx
,
196 nvme_completion_fn handler
, unsigned timeout
)
199 wait_event_killable(nvmeq
->sq_full
,
200 (cmdid
= alloc_cmdid(nvmeq
, ctx
, handler
, timeout
)) >= 0);
201 return (cmdid
< 0) ? -EINTR
: cmdid
;
204 /* Special values must be less than 0x1000 */
205 #define CMD_CTX_BASE ((void *)POISON_POINTER_DELTA)
206 #define CMD_CTX_CANCELLED (0x30C + CMD_CTX_BASE)
207 #define CMD_CTX_COMPLETED (0x310 + CMD_CTX_BASE)
208 #define CMD_CTX_INVALID (0x314 + CMD_CTX_BASE)
209 #define CMD_CTX_ABORT (0x318 + CMD_CTX_BASE)
211 static void special_completion(struct nvme_queue
*nvmeq
, void *ctx
,
212 struct nvme_completion
*cqe
)
214 if (ctx
== CMD_CTX_CANCELLED
)
216 if (ctx
== CMD_CTX_ABORT
) {
217 ++nvmeq
->dev
->abort_limit
;
220 if (ctx
== CMD_CTX_COMPLETED
) {
221 dev_warn(nvmeq
->q_dmadev
,
222 "completed id %d twice on queue %d\n",
223 cqe
->command_id
, le16_to_cpup(&cqe
->sq_id
));
226 if (ctx
== CMD_CTX_INVALID
) {
227 dev_warn(nvmeq
->q_dmadev
,
228 "invalid id %d completed on queue %d\n",
229 cqe
->command_id
, le16_to_cpup(&cqe
->sq_id
));
233 dev_warn(nvmeq
->q_dmadev
, "Unknown special completion %p\n", ctx
);
236 static void async_completion(struct nvme_queue
*nvmeq
, void *ctx
,
237 struct nvme_completion
*cqe
)
239 struct async_cmd_info
*cmdinfo
= ctx
;
240 cmdinfo
->result
= le32_to_cpup(&cqe
->result
);
241 cmdinfo
->status
= le16_to_cpup(&cqe
->status
) >> 1;
242 queue_kthread_work(cmdinfo
->worker
, &cmdinfo
->work
);
246 * Called with local interrupts disabled and the q_lock held. May not sleep.
248 static void *free_cmdid(struct nvme_queue
*nvmeq
, int cmdid
,
249 nvme_completion_fn
*fn
)
252 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
254 if (cmdid
>= nvmeq
->q_depth
|| !info
[cmdid
].fn
) {
256 *fn
= special_completion
;
257 return CMD_CTX_INVALID
;
260 *fn
= info
[cmdid
].fn
;
261 ctx
= info
[cmdid
].ctx
;
262 info
[cmdid
].fn
= special_completion
;
263 info
[cmdid
].ctx
= CMD_CTX_COMPLETED
;
264 clear_bit(cmdid
, nvmeq
->cmdid_data
);
265 wake_up(&nvmeq
->sq_full
);
269 static void *cancel_cmdid(struct nvme_queue
*nvmeq
, int cmdid
,
270 nvme_completion_fn
*fn
)
273 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
275 *fn
= info
[cmdid
].fn
;
276 ctx
= info
[cmdid
].ctx
;
277 info
[cmdid
].fn
= special_completion
;
278 info
[cmdid
].ctx
= CMD_CTX_CANCELLED
;
282 static struct nvme_queue
*raw_nvmeq(struct nvme_dev
*dev
, int qid
)
284 return rcu_dereference_raw(dev
->queues
[qid
]);
287 static struct nvme_queue
*get_nvmeq(struct nvme_dev
*dev
) __acquires(RCU
)
289 struct nvme_queue
*nvmeq
;
290 unsigned queue_id
= get_cpu_var(*dev
->io_queue
);
293 nvmeq
= rcu_dereference(dev
->queues
[queue_id
]);
298 put_cpu_var(*dev
->io_queue
);
302 static void put_nvmeq(struct nvme_queue
*nvmeq
) __releases(RCU
)
305 put_cpu_var(nvmeq
->dev
->io_queue
);
308 static struct nvme_queue
*lock_nvmeq(struct nvme_dev
*dev
, int q_idx
)
311 struct nvme_queue
*nvmeq
;
314 nvmeq
= rcu_dereference(dev
->queues
[q_idx
]);
322 static void unlock_nvmeq(struct nvme_queue
*nvmeq
) __releases(RCU
)
328 * nvme_submit_cmd() - Copy a command into a queue and ring the doorbell
329 * @nvmeq: The queue to use
330 * @cmd: The command to send
332 * Safe to use from interrupt context
334 static int nvme_submit_cmd(struct nvme_queue
*nvmeq
, struct nvme_command
*cmd
)
338 spin_lock_irqsave(&nvmeq
->q_lock
, flags
);
339 if (nvmeq
->q_suspended
) {
340 spin_unlock_irqrestore(&nvmeq
->q_lock
, flags
);
343 tail
= nvmeq
->sq_tail
;
344 memcpy(&nvmeq
->sq_cmds
[tail
], cmd
, sizeof(*cmd
));
345 if (++tail
== nvmeq
->q_depth
)
347 writel(tail
, nvmeq
->q_db
);
348 nvmeq
->sq_tail
= tail
;
349 spin_unlock_irqrestore(&nvmeq
->q_lock
, flags
);
354 static __le64
**iod_list(struct nvme_iod
*iod
)
356 return ((void *)iod
) + iod
->offset
;
360 * Will slightly overestimate the number of pages needed. This is OK
361 * as it only leads to a small amount of wasted memory for the lifetime of
364 static int nvme_npages(unsigned size
)
366 unsigned nprps
= DIV_ROUND_UP(size
+ PAGE_SIZE
, PAGE_SIZE
);
367 return DIV_ROUND_UP(8 * nprps
, PAGE_SIZE
- 8);
370 static struct nvme_iod
*
371 nvme_alloc_iod(unsigned nseg
, unsigned nbytes
, gfp_t gfp
)
373 struct nvme_iod
*iod
= kmalloc(sizeof(struct nvme_iod
) +
374 sizeof(__le64
*) * nvme_npages(nbytes
) +
375 sizeof(struct scatterlist
) * nseg
, gfp
);
378 iod
->offset
= offsetof(struct nvme_iod
, sg
[nseg
]);
380 iod
->length
= nbytes
;
382 iod
->first_dma
= 0ULL;
383 iod
->start_time
= jiffies
;
389 void nvme_free_iod(struct nvme_dev
*dev
, struct nvme_iod
*iod
)
391 const int last_prp
= PAGE_SIZE
/ 8 - 1;
393 __le64
**list
= iod_list(iod
);
394 dma_addr_t prp_dma
= iod
->first_dma
;
396 if (iod
->npages
== 0)
397 dma_pool_free(dev
->prp_small_pool
, list
[0], prp_dma
);
398 for (i
= 0; i
< iod
->npages
; i
++) {
399 __le64
*prp_list
= list
[i
];
400 dma_addr_t next_prp_dma
= le64_to_cpu(prp_list
[last_prp
]);
401 dma_pool_free(dev
->prp_page_pool
, prp_list
, prp_dma
);
402 prp_dma
= next_prp_dma
;
407 static void nvme_start_io_acct(struct bio
*bio
)
409 struct gendisk
*disk
= bio
->bi_bdev
->bd_disk
;
410 if (blk_queue_io_stat(disk
->queue
)) {
411 const int rw
= bio_data_dir(bio
);
412 int cpu
= part_stat_lock();
413 part_round_stats(cpu
, &disk
->part0
);
414 part_stat_inc(cpu
, &disk
->part0
, ios
[rw
]);
415 part_stat_add(cpu
, &disk
->part0
, sectors
[rw
],
417 part_inc_in_flight(&disk
->part0
, rw
);
422 static void nvme_end_io_acct(struct bio
*bio
, unsigned long start_time
)
424 struct gendisk
*disk
= bio
->bi_bdev
->bd_disk
;
425 if (blk_queue_io_stat(disk
->queue
)) {
426 const int rw
= bio_data_dir(bio
);
427 unsigned long duration
= jiffies
- start_time
;
428 int cpu
= part_stat_lock();
429 part_stat_add(cpu
, &disk
->part0
, ticks
[rw
], duration
);
430 part_round_stats(cpu
, &disk
->part0
);
431 part_dec_in_flight(&disk
->part0
, rw
);
436 static void bio_completion(struct nvme_queue
*nvmeq
, void *ctx
,
437 struct nvme_completion
*cqe
)
439 struct nvme_iod
*iod
= ctx
;
440 struct bio
*bio
= iod
->private;
441 u16 status
= le16_to_cpup(&cqe
->status
) >> 1;
444 if (unlikely(status
)) {
445 if (!(status
& NVME_SC_DNR
||
446 bio
->bi_rw
& REQ_FAILFAST_MASK
) &&
447 (jiffies
- iod
->start_time
) < IOD_TIMEOUT
) {
448 if (!waitqueue_active(&nvmeq
->sq_full
))
449 add_wait_queue(&nvmeq
->sq_full
,
450 &nvmeq
->sq_cong_wait
);
451 list_add_tail(&iod
->node
, &nvmeq
->iod_bio
);
452 wake_up(&nvmeq
->sq_full
);
458 dma_unmap_sg(nvmeq
->q_dmadev
, iod
->sg
, iod
->nents
,
459 bio_data_dir(bio
) ? DMA_TO_DEVICE
: DMA_FROM_DEVICE
);
460 nvme_end_io_acct(bio
, iod
->start_time
);
462 nvme_free_iod(nvmeq
->dev
, iod
);
464 trace_block_bio_complete(bdev_get_queue(bio
->bi_bdev
), bio
, error
);
465 bio_endio(bio
, error
);
468 /* length is in bytes. gfp flags indicates whether we may sleep. */
469 int nvme_setup_prps(struct nvme_dev
*dev
, struct nvme_iod
*iod
, int total_len
,
472 struct dma_pool
*pool
;
473 int length
= total_len
;
474 struct scatterlist
*sg
= iod
->sg
;
475 int dma_len
= sg_dma_len(sg
);
476 u64 dma_addr
= sg_dma_address(sg
);
477 int offset
= offset_in_page(dma_addr
);
479 __le64
**list
= iod_list(iod
);
483 length
-= (PAGE_SIZE
- offset
);
487 dma_len
-= (PAGE_SIZE
- offset
);
489 dma_addr
+= (PAGE_SIZE
- offset
);
492 dma_addr
= sg_dma_address(sg
);
493 dma_len
= sg_dma_len(sg
);
496 if (length
<= PAGE_SIZE
) {
497 iod
->first_dma
= dma_addr
;
501 nprps
= DIV_ROUND_UP(length
, PAGE_SIZE
);
502 if (nprps
<= (256 / 8)) {
503 pool
= dev
->prp_small_pool
;
506 pool
= dev
->prp_page_pool
;
510 prp_list
= dma_pool_alloc(pool
, gfp
, &prp_dma
);
512 iod
->first_dma
= dma_addr
;
514 return (total_len
- length
) + PAGE_SIZE
;
517 iod
->first_dma
= prp_dma
;
520 if (i
== PAGE_SIZE
/ 8) {
521 __le64
*old_prp_list
= prp_list
;
522 prp_list
= dma_pool_alloc(pool
, gfp
, &prp_dma
);
524 return total_len
- length
;
525 list
[iod
->npages
++] = prp_list
;
526 prp_list
[0] = old_prp_list
[i
- 1];
527 old_prp_list
[i
- 1] = cpu_to_le64(prp_dma
);
530 prp_list
[i
++] = cpu_to_le64(dma_addr
);
531 dma_len
-= PAGE_SIZE
;
532 dma_addr
+= PAGE_SIZE
;
540 dma_addr
= sg_dma_address(sg
);
541 dma_len
= sg_dma_len(sg
);
547 static int nvme_split_and_submit(struct bio
*bio
, struct nvme_queue
*nvmeq
,
550 struct bio
*split
= bio_split(bio
, len
>> 9, GFP_ATOMIC
, NULL
);
554 trace_block_split(bdev_get_queue(bio
->bi_bdev
), bio
,
555 split
->bi_iter
.bi_sector
);
556 bio_chain(split
, bio
);
558 if (!waitqueue_active(&nvmeq
->sq_full
))
559 add_wait_queue(&nvmeq
->sq_full
, &nvmeq
->sq_cong_wait
);
560 bio_list_add(&nvmeq
->sq_cong
, split
);
561 bio_list_add(&nvmeq
->sq_cong
, bio
);
562 wake_up(&nvmeq
->sq_full
);
567 /* NVMe scatterlists require no holes in the virtual address */
568 #define BIOVEC_NOT_VIRT_MERGEABLE(vec1, vec2) ((vec2)->bv_offset || \
569 (((vec1)->bv_offset + (vec1)->bv_len) % PAGE_SIZE))
571 static int nvme_map_bio(struct nvme_queue
*nvmeq
, struct nvme_iod
*iod
,
572 struct bio
*bio
, enum dma_data_direction dma_dir
, int psegs
)
574 struct bio_vec bvec
, bvprv
;
575 struct bvec_iter iter
;
576 struct scatterlist
*sg
= NULL
;
577 int length
= 0, nsegs
= 0, split_len
= bio
->bi_iter
.bi_size
;
580 if (nvmeq
->dev
->stripe_size
)
581 split_len
= nvmeq
->dev
->stripe_size
-
582 ((bio
->bi_iter
.bi_sector
<< 9) &
583 (nvmeq
->dev
->stripe_size
- 1));
585 sg_init_table(iod
->sg
, psegs
);
586 bio_for_each_segment(bvec
, bio
, iter
) {
587 if (!first
&& BIOVEC_PHYS_MERGEABLE(&bvprv
, &bvec
)) {
588 sg
->length
+= bvec
.bv_len
;
590 if (!first
&& BIOVEC_NOT_VIRT_MERGEABLE(&bvprv
, &bvec
))
591 return nvme_split_and_submit(bio
, nvmeq
,
594 sg
= sg
? sg
+ 1 : iod
->sg
;
595 sg_set_page(sg
, bvec
.bv_page
,
596 bvec
.bv_len
, bvec
.bv_offset
);
600 if (split_len
- length
< bvec
.bv_len
)
601 return nvme_split_and_submit(bio
, nvmeq
, split_len
);
602 length
+= bvec
.bv_len
;
608 if (dma_map_sg(nvmeq
->q_dmadev
, iod
->sg
, iod
->nents
, dma_dir
) == 0)
611 BUG_ON(length
!= bio
->bi_iter
.bi_size
);
615 static int nvme_submit_discard(struct nvme_queue
*nvmeq
, struct nvme_ns
*ns
,
616 struct bio
*bio
, struct nvme_iod
*iod
, int cmdid
)
618 struct nvme_dsm_range
*range
=
619 (struct nvme_dsm_range
*)iod_list(iod
)[0];
620 struct nvme_command
*cmnd
= &nvmeq
->sq_cmds
[nvmeq
->sq_tail
];
622 range
->cattr
= cpu_to_le32(0);
623 range
->nlb
= cpu_to_le32(bio
->bi_iter
.bi_size
>> ns
->lba_shift
);
624 range
->slba
= cpu_to_le64(nvme_block_nr(ns
, bio
->bi_iter
.bi_sector
));
626 memset(cmnd
, 0, sizeof(*cmnd
));
627 cmnd
->dsm
.opcode
= nvme_cmd_dsm
;
628 cmnd
->dsm
.command_id
= cmdid
;
629 cmnd
->dsm
.nsid
= cpu_to_le32(ns
->ns_id
);
630 cmnd
->dsm
.prp1
= cpu_to_le64(iod
->first_dma
);
632 cmnd
->dsm
.attributes
= cpu_to_le32(NVME_DSMGMT_AD
);
634 if (++nvmeq
->sq_tail
== nvmeq
->q_depth
)
636 writel(nvmeq
->sq_tail
, nvmeq
->q_db
);
641 static int nvme_submit_flush(struct nvme_queue
*nvmeq
, struct nvme_ns
*ns
,
644 struct nvme_command
*cmnd
= &nvmeq
->sq_cmds
[nvmeq
->sq_tail
];
646 memset(cmnd
, 0, sizeof(*cmnd
));
647 cmnd
->common
.opcode
= nvme_cmd_flush
;
648 cmnd
->common
.command_id
= cmdid
;
649 cmnd
->common
.nsid
= cpu_to_le32(ns
->ns_id
);
651 if (++nvmeq
->sq_tail
== nvmeq
->q_depth
)
653 writel(nvmeq
->sq_tail
, nvmeq
->q_db
);
658 static int nvme_submit_iod(struct nvme_queue
*nvmeq
, struct nvme_iod
*iod
)
660 struct bio
*bio
= iod
->private;
661 struct nvme_ns
*ns
= bio
->bi_bdev
->bd_disk
->private_data
;
662 struct nvme_command
*cmnd
;
667 cmdid
= alloc_cmdid(nvmeq
, iod
, bio_completion
, NVME_IO_TIMEOUT
);
668 if (unlikely(cmdid
< 0))
671 if (bio
->bi_rw
& REQ_DISCARD
)
672 return nvme_submit_discard(nvmeq
, ns
, bio
, iod
, cmdid
);
673 if (bio
->bi_rw
& REQ_FLUSH
)
674 return nvme_submit_flush(nvmeq
, ns
, cmdid
);
677 if (bio
->bi_rw
& REQ_FUA
)
678 control
|= NVME_RW_FUA
;
679 if (bio
->bi_rw
& (REQ_FAILFAST_DEV
| REQ_RAHEAD
))
680 control
|= NVME_RW_LR
;
683 if (bio
->bi_rw
& REQ_RAHEAD
)
684 dsmgmt
|= NVME_RW_DSM_FREQ_PREFETCH
;
686 cmnd
= &nvmeq
->sq_cmds
[nvmeq
->sq_tail
];
687 memset(cmnd
, 0, sizeof(*cmnd
));
689 cmnd
->rw
.opcode
= bio_data_dir(bio
) ? nvme_cmd_write
: nvme_cmd_read
;
690 cmnd
->rw
.command_id
= cmdid
;
691 cmnd
->rw
.nsid
= cpu_to_le32(ns
->ns_id
);
692 cmnd
->rw
.prp1
= cpu_to_le64(sg_dma_address(iod
->sg
));
693 cmnd
->rw
.prp2
= cpu_to_le64(iod
->first_dma
);
694 cmnd
->rw
.slba
= cpu_to_le64(nvme_block_nr(ns
, bio
->bi_iter
.bi_sector
));
696 cpu_to_le16((bio
->bi_iter
.bi_size
>> ns
->lba_shift
) - 1);
697 cmnd
->rw
.control
= cpu_to_le16(control
);
698 cmnd
->rw
.dsmgmt
= cpu_to_le32(dsmgmt
);
700 if (++nvmeq
->sq_tail
== nvmeq
->q_depth
)
702 writel(nvmeq
->sq_tail
, nvmeq
->q_db
);
707 static int nvme_split_flush_data(struct nvme_queue
*nvmeq
, struct bio
*bio
)
709 struct bio
*split
= bio_clone(bio
, GFP_ATOMIC
);
713 split
->bi_iter
.bi_size
= 0;
714 split
->bi_phys_segments
= 0;
715 bio
->bi_rw
&= ~REQ_FLUSH
;
716 bio_chain(split
, bio
);
718 if (!waitqueue_active(&nvmeq
->sq_full
))
719 add_wait_queue(&nvmeq
->sq_full
, &nvmeq
->sq_cong_wait
);
720 bio_list_add(&nvmeq
->sq_cong
, split
);
721 bio_list_add(&nvmeq
->sq_cong
, bio
);
722 wake_up_process(nvme_thread
);
728 * Called with local interrupts disabled and the q_lock held. May not sleep.
730 static int nvme_submit_bio_queue(struct nvme_queue
*nvmeq
, struct nvme_ns
*ns
,
733 struct nvme_iod
*iod
;
734 int psegs
= bio_phys_segments(ns
->queue
, bio
);
737 if ((bio
->bi_rw
& REQ_FLUSH
) && psegs
)
738 return nvme_split_flush_data(nvmeq
, bio
);
740 iod
= nvme_alloc_iod(psegs
, bio
->bi_iter
.bi_size
, GFP_ATOMIC
);
745 if (bio
->bi_rw
& REQ_DISCARD
) {
748 * We reuse the small pool to allocate the 16-byte range here
749 * as it is not worth having a special pool for these or
750 * additional cases to handle freeing the iod.
752 range
= dma_pool_alloc(nvmeq
->dev
->prp_small_pool
,
759 iod_list(iod
)[0] = (__le64
*)range
;
762 result
= nvme_map_bio(nvmeq
, iod
, bio
,
763 bio_data_dir(bio
) ? DMA_TO_DEVICE
: DMA_FROM_DEVICE
,
767 if (nvme_setup_prps(nvmeq
->dev
, iod
, result
, GFP_ATOMIC
) !=
772 nvme_start_io_acct(bio
);
774 if (unlikely(nvme_submit_iod(nvmeq
, iod
))) {
775 if (!waitqueue_active(&nvmeq
->sq_full
))
776 add_wait_queue(&nvmeq
->sq_full
, &nvmeq
->sq_cong_wait
);
777 list_add_tail(&iod
->node
, &nvmeq
->iod_bio
);
782 nvme_free_iod(nvmeq
->dev
, iod
);
786 static int nvme_process_cq(struct nvme_queue
*nvmeq
)
790 head
= nvmeq
->cq_head
;
791 phase
= nvmeq
->cq_phase
;
795 nvme_completion_fn fn
;
796 struct nvme_completion cqe
= nvmeq
->cqes
[head
];
797 if ((le16_to_cpu(cqe
.status
) & 1) != phase
)
799 nvmeq
->sq_head
= le16_to_cpu(cqe
.sq_head
);
800 if (++head
== nvmeq
->q_depth
) {
805 ctx
= free_cmdid(nvmeq
, cqe
.command_id
, &fn
);
806 fn(nvmeq
, ctx
, &cqe
);
809 /* If the controller ignores the cq head doorbell and continuously
810 * writes to the queue, it is theoretically possible to wrap around
811 * the queue twice and mistakenly return IRQ_NONE. Linux only
812 * requires that 0.1% of your interrupts are handled, so this isn't
815 if (head
== nvmeq
->cq_head
&& phase
== nvmeq
->cq_phase
)
818 writel(head
, nvmeq
->q_db
+ nvmeq
->dev
->db_stride
);
819 nvmeq
->cq_head
= head
;
820 nvmeq
->cq_phase
= phase
;
826 static void nvme_make_request(struct request_queue
*q
, struct bio
*bio
)
828 struct nvme_ns
*ns
= q
->queuedata
;
829 struct nvme_queue
*nvmeq
= get_nvmeq(ns
->dev
);
833 bio_endio(bio
, -EIO
);
837 spin_lock_irq(&nvmeq
->q_lock
);
838 if (!nvmeq
->q_suspended
&& bio_list_empty(&nvmeq
->sq_cong
))
839 result
= nvme_submit_bio_queue(nvmeq
, ns
, bio
);
840 if (unlikely(result
)) {
841 if (!waitqueue_active(&nvmeq
->sq_full
))
842 add_wait_queue(&nvmeq
->sq_full
, &nvmeq
->sq_cong_wait
);
843 bio_list_add(&nvmeq
->sq_cong
, bio
);
846 nvme_process_cq(nvmeq
);
847 spin_unlock_irq(&nvmeq
->q_lock
);
851 static irqreturn_t
nvme_irq(int irq
, void *data
)
854 struct nvme_queue
*nvmeq
= data
;
855 spin_lock(&nvmeq
->q_lock
);
856 nvme_process_cq(nvmeq
);
857 result
= nvmeq
->cqe_seen
? IRQ_HANDLED
: IRQ_NONE
;
859 spin_unlock(&nvmeq
->q_lock
);
863 static irqreturn_t
nvme_irq_check(int irq
, void *data
)
865 struct nvme_queue
*nvmeq
= data
;
866 struct nvme_completion cqe
= nvmeq
->cqes
[nvmeq
->cq_head
];
867 if ((le16_to_cpu(cqe
.status
) & 1) != nvmeq
->cq_phase
)
869 return IRQ_WAKE_THREAD
;
872 static void nvme_abort_command(struct nvme_queue
*nvmeq
, int cmdid
)
874 spin_lock_irq(&nvmeq
->q_lock
);
875 cancel_cmdid(nvmeq
, cmdid
, NULL
);
876 spin_unlock_irq(&nvmeq
->q_lock
);
879 struct sync_cmd_info
{
880 struct task_struct
*task
;
885 static void sync_completion(struct nvme_queue
*nvmeq
, void *ctx
,
886 struct nvme_completion
*cqe
)
888 struct sync_cmd_info
*cmdinfo
= ctx
;
889 cmdinfo
->result
= le32_to_cpup(&cqe
->result
);
890 cmdinfo
->status
= le16_to_cpup(&cqe
->status
) >> 1;
891 wake_up_process(cmdinfo
->task
);
895 * Returns 0 on success. If the result is negative, it's a Linux error code;
896 * if the result is positive, it's an NVM Express status code
898 static int nvme_submit_sync_cmd(struct nvme_dev
*dev
, int q_idx
,
899 struct nvme_command
*cmd
,
900 u32
*result
, unsigned timeout
)
903 struct sync_cmd_info cmdinfo
;
904 struct nvme_queue
*nvmeq
;
906 nvmeq
= lock_nvmeq(dev
, q_idx
);
910 cmdinfo
.task
= current
;
911 cmdinfo
.status
= -EINTR
;
913 cmdid
= alloc_cmdid(nvmeq
, &cmdinfo
, sync_completion
, timeout
);
918 cmd
->common
.command_id
= cmdid
;
920 set_current_state(TASK_KILLABLE
);
921 ret
= nvme_submit_cmd(nvmeq
, cmd
);
923 free_cmdid(nvmeq
, cmdid
, NULL
);
925 set_current_state(TASK_RUNNING
);
929 schedule_timeout(timeout
);
931 if (cmdinfo
.status
== -EINTR
) {
932 nvmeq
= lock_nvmeq(dev
, q_idx
);
934 nvme_abort_command(nvmeq
, cmdid
);
941 *result
= cmdinfo
.result
;
943 return cmdinfo
.status
;
946 static int nvme_submit_async_cmd(struct nvme_queue
*nvmeq
,
947 struct nvme_command
*cmd
,
948 struct async_cmd_info
*cmdinfo
, unsigned timeout
)
952 cmdid
= alloc_cmdid_killable(nvmeq
, cmdinfo
, async_completion
, timeout
);
955 cmdinfo
->status
= -EINTR
;
956 cmd
->common
.command_id
= cmdid
;
957 return nvme_submit_cmd(nvmeq
, cmd
);
960 int nvme_submit_admin_cmd(struct nvme_dev
*dev
, struct nvme_command
*cmd
,
963 return nvme_submit_sync_cmd(dev
, 0, cmd
, result
, ADMIN_TIMEOUT
);
966 int nvme_submit_io_cmd(struct nvme_dev
*dev
, struct nvme_command
*cmd
,
969 return nvme_submit_sync_cmd(dev
, smp_processor_id() + 1, cmd
, result
,
973 static int nvme_submit_admin_cmd_async(struct nvme_dev
*dev
,
974 struct nvme_command
*cmd
, struct async_cmd_info
*cmdinfo
)
976 return nvme_submit_async_cmd(raw_nvmeq(dev
, 0), cmd
, cmdinfo
,
980 static int adapter_delete_queue(struct nvme_dev
*dev
, u8 opcode
, u16 id
)
983 struct nvme_command c
;
985 memset(&c
, 0, sizeof(c
));
986 c
.delete_queue
.opcode
= opcode
;
987 c
.delete_queue
.qid
= cpu_to_le16(id
);
989 status
= nvme_submit_admin_cmd(dev
, &c
, NULL
);
995 static int adapter_alloc_cq(struct nvme_dev
*dev
, u16 qid
,
996 struct nvme_queue
*nvmeq
)
999 struct nvme_command c
;
1000 int flags
= NVME_QUEUE_PHYS_CONTIG
| NVME_CQ_IRQ_ENABLED
;
1002 memset(&c
, 0, sizeof(c
));
1003 c
.create_cq
.opcode
= nvme_admin_create_cq
;
1004 c
.create_cq
.prp1
= cpu_to_le64(nvmeq
->cq_dma_addr
);
1005 c
.create_cq
.cqid
= cpu_to_le16(qid
);
1006 c
.create_cq
.qsize
= cpu_to_le16(nvmeq
->q_depth
- 1);
1007 c
.create_cq
.cq_flags
= cpu_to_le16(flags
);
1008 c
.create_cq
.irq_vector
= cpu_to_le16(nvmeq
->cq_vector
);
1010 status
= nvme_submit_admin_cmd(dev
, &c
, NULL
);
1016 static int adapter_alloc_sq(struct nvme_dev
*dev
, u16 qid
,
1017 struct nvme_queue
*nvmeq
)
1020 struct nvme_command c
;
1021 int flags
= NVME_QUEUE_PHYS_CONTIG
| NVME_SQ_PRIO_MEDIUM
;
1023 memset(&c
, 0, sizeof(c
));
1024 c
.create_sq
.opcode
= nvme_admin_create_sq
;
1025 c
.create_sq
.prp1
= cpu_to_le64(nvmeq
->sq_dma_addr
);
1026 c
.create_sq
.sqid
= cpu_to_le16(qid
);
1027 c
.create_sq
.qsize
= cpu_to_le16(nvmeq
->q_depth
- 1);
1028 c
.create_sq
.sq_flags
= cpu_to_le16(flags
);
1029 c
.create_sq
.cqid
= cpu_to_le16(qid
);
1031 status
= nvme_submit_admin_cmd(dev
, &c
, NULL
);
1037 static int adapter_delete_cq(struct nvme_dev
*dev
, u16 cqid
)
1039 return adapter_delete_queue(dev
, nvme_admin_delete_cq
, cqid
);
1042 static int adapter_delete_sq(struct nvme_dev
*dev
, u16 sqid
)
1044 return adapter_delete_queue(dev
, nvme_admin_delete_sq
, sqid
);
1047 int nvme_identify(struct nvme_dev
*dev
, unsigned nsid
, unsigned cns
,
1048 dma_addr_t dma_addr
)
1050 struct nvme_command c
;
1052 memset(&c
, 0, sizeof(c
));
1053 c
.identify
.opcode
= nvme_admin_identify
;
1054 c
.identify
.nsid
= cpu_to_le32(nsid
);
1055 c
.identify
.prp1
= cpu_to_le64(dma_addr
);
1056 c
.identify
.cns
= cpu_to_le32(cns
);
1058 return nvme_submit_admin_cmd(dev
, &c
, NULL
);
1061 int nvme_get_features(struct nvme_dev
*dev
, unsigned fid
, unsigned nsid
,
1062 dma_addr_t dma_addr
, u32
*result
)
1064 struct nvme_command c
;
1066 memset(&c
, 0, sizeof(c
));
1067 c
.features
.opcode
= nvme_admin_get_features
;
1068 c
.features
.nsid
= cpu_to_le32(nsid
);
1069 c
.features
.prp1
= cpu_to_le64(dma_addr
);
1070 c
.features
.fid
= cpu_to_le32(fid
);
1072 return nvme_submit_admin_cmd(dev
, &c
, result
);
1075 int nvme_set_features(struct nvme_dev
*dev
, unsigned fid
, unsigned dword11
,
1076 dma_addr_t dma_addr
, u32
*result
)
1078 struct nvme_command c
;
1080 memset(&c
, 0, sizeof(c
));
1081 c
.features
.opcode
= nvme_admin_set_features
;
1082 c
.features
.prp1
= cpu_to_le64(dma_addr
);
1083 c
.features
.fid
= cpu_to_le32(fid
);
1084 c
.features
.dword11
= cpu_to_le32(dword11
);
1086 return nvme_submit_admin_cmd(dev
, &c
, result
);
1090 * nvme_abort_cmd - Attempt aborting a command
1091 * @cmdid: Command id of a timed out IO
1092 * @queue: The queue with timed out IO
1094 * Schedule controller reset if the command was already aborted once before and
1095 * still hasn't been returned to the driver, or if this is the admin queue.
1097 static void nvme_abort_cmd(int cmdid
, struct nvme_queue
*nvmeq
)
1100 struct nvme_command cmd
;
1101 struct nvme_dev
*dev
= nvmeq
->dev
;
1102 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
1103 struct nvme_queue
*adminq
;
1105 if (!nvmeq
->qid
|| info
[cmdid
].aborted
) {
1106 if (work_busy(&dev
->reset_work
))
1108 list_del_init(&dev
->node
);
1109 dev_warn(&dev
->pci_dev
->dev
,
1110 "I/O %d QID %d timeout, reset controller\n", cmdid
,
1112 dev
->reset_workfn
= nvme_reset_failed_dev
;
1113 queue_work(nvme_workq
, &dev
->reset_work
);
1117 if (!dev
->abort_limit
)
1120 adminq
= rcu_dereference(dev
->queues
[0]);
1121 a_cmdid
= alloc_cmdid(adminq
, CMD_CTX_ABORT
, special_completion
,
1126 memset(&cmd
, 0, sizeof(cmd
));
1127 cmd
.abort
.opcode
= nvme_admin_abort_cmd
;
1128 cmd
.abort
.cid
= cmdid
;
1129 cmd
.abort
.sqid
= cpu_to_le16(nvmeq
->qid
);
1130 cmd
.abort
.command_id
= a_cmdid
;
1133 info
[cmdid
].aborted
= 1;
1134 info
[cmdid
].timeout
= jiffies
+ ADMIN_TIMEOUT
;
1136 dev_warn(nvmeq
->q_dmadev
, "Aborting I/O %d QID %d\n", cmdid
,
1138 nvme_submit_cmd(adminq
, &cmd
);
1142 * nvme_cancel_ios - Cancel outstanding I/Os
1143 * @queue: The queue to cancel I/Os on
1144 * @timeout: True to only cancel I/Os which have timed out
1146 static void nvme_cancel_ios(struct nvme_queue
*nvmeq
, bool timeout
)
1148 int depth
= nvmeq
->q_depth
- 1;
1149 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
1150 unsigned long now
= jiffies
;
1153 for_each_set_bit(cmdid
, nvmeq
->cmdid_data
, depth
) {
1155 nvme_completion_fn fn
;
1156 static struct nvme_completion cqe
= {
1157 .status
= cpu_to_le16(NVME_SC_ABORT_REQ
<< 1),
1160 if (timeout
&& !time_after(now
, info
[cmdid
].timeout
))
1162 if (info
[cmdid
].ctx
== CMD_CTX_CANCELLED
)
1164 if (timeout
&& nvmeq
->dev
->initialized
) {
1165 nvme_abort_cmd(cmdid
, nvmeq
);
1168 dev_warn(nvmeq
->q_dmadev
, "Cancelling I/O %d QID %d\n", cmdid
,
1170 ctx
= cancel_cmdid(nvmeq
, cmdid
, &fn
);
1171 fn(nvmeq
, ctx
, &cqe
);
1175 static void nvme_free_queue(struct rcu_head
*r
)
1177 struct nvme_queue
*nvmeq
= container_of(r
, struct nvme_queue
, r_head
);
1179 spin_lock_irq(&nvmeq
->q_lock
);
1180 while (bio_list_peek(&nvmeq
->sq_cong
)) {
1181 struct bio
*bio
= bio_list_pop(&nvmeq
->sq_cong
);
1182 bio_endio(bio
, -EIO
);
1184 while (!list_empty(&nvmeq
->iod_bio
)) {
1185 static struct nvme_completion cqe
= {
1186 .status
= cpu_to_le16(
1187 (NVME_SC_ABORT_REQ
| NVME_SC_DNR
) << 1),
1189 struct nvme_iod
*iod
= list_first_entry(&nvmeq
->iod_bio
,
1192 list_del(&iod
->node
);
1193 bio_completion(nvmeq
, iod
, &cqe
);
1195 spin_unlock_irq(&nvmeq
->q_lock
);
1197 dma_free_coherent(nvmeq
->q_dmadev
, CQ_SIZE(nvmeq
->q_depth
),
1198 (void *)nvmeq
->cqes
, nvmeq
->cq_dma_addr
);
1199 dma_free_coherent(nvmeq
->q_dmadev
, SQ_SIZE(nvmeq
->q_depth
),
1200 nvmeq
->sq_cmds
, nvmeq
->sq_dma_addr
);
1202 free_cpumask_var(nvmeq
->cpu_mask
);
1206 static void nvme_free_queues(struct nvme_dev
*dev
, int lowest
)
1210 for (i
= dev
->queue_count
- 1; i
>= lowest
; i
--) {
1211 struct nvme_queue
*nvmeq
= raw_nvmeq(dev
, i
);
1212 rcu_assign_pointer(dev
->queues
[i
], NULL
);
1213 call_rcu(&nvmeq
->r_head
, nvme_free_queue
);
1219 * nvme_suspend_queue - put queue into suspended state
1220 * @nvmeq - queue to suspend
1222 * Returns 1 if already suspended, 0 otherwise.
1224 static int nvme_suspend_queue(struct nvme_queue
*nvmeq
)
1226 int vector
= nvmeq
->dev
->entry
[nvmeq
->cq_vector
].vector
;
1228 spin_lock_irq(&nvmeq
->q_lock
);
1229 if (nvmeq
->q_suspended
) {
1230 spin_unlock_irq(&nvmeq
->q_lock
);
1233 nvmeq
->q_suspended
= 1;
1234 nvmeq
->dev
->online_queues
--;
1235 spin_unlock_irq(&nvmeq
->q_lock
);
1237 irq_set_affinity_hint(vector
, NULL
);
1238 free_irq(vector
, nvmeq
);
1243 static void nvme_clear_queue(struct nvme_queue
*nvmeq
)
1245 spin_lock_irq(&nvmeq
->q_lock
);
1246 nvme_process_cq(nvmeq
);
1247 nvme_cancel_ios(nvmeq
, false);
1248 spin_unlock_irq(&nvmeq
->q_lock
);
1251 static void nvme_disable_queue(struct nvme_dev
*dev
, int qid
)
1253 struct nvme_queue
*nvmeq
= raw_nvmeq(dev
, qid
);
1257 if (nvme_suspend_queue(nvmeq
))
1260 /* Don't tell the adapter to delete the admin queue.
1261 * Don't tell a removed adapter to delete IO queues. */
1262 if (qid
&& readl(&dev
->bar
->csts
) != -1) {
1263 adapter_delete_sq(dev
, qid
);
1264 adapter_delete_cq(dev
, qid
);
1266 nvme_clear_queue(nvmeq
);
1269 static struct nvme_queue
*nvme_alloc_queue(struct nvme_dev
*dev
, int qid
,
1270 int depth
, int vector
)
1272 struct device
*dmadev
= &dev
->pci_dev
->dev
;
1273 unsigned extra
= nvme_queue_extra(depth
);
1274 struct nvme_queue
*nvmeq
= kzalloc(sizeof(*nvmeq
) + extra
, GFP_KERNEL
);
1278 nvmeq
->cqes
= dma_alloc_coherent(dmadev
, CQ_SIZE(depth
),
1279 &nvmeq
->cq_dma_addr
, GFP_KERNEL
);
1282 memset((void *)nvmeq
->cqes
, 0, CQ_SIZE(depth
));
1284 nvmeq
->sq_cmds
= dma_alloc_coherent(dmadev
, SQ_SIZE(depth
),
1285 &nvmeq
->sq_dma_addr
, GFP_KERNEL
);
1286 if (!nvmeq
->sq_cmds
)
1289 if (qid
&& !zalloc_cpumask_var(&nvmeq
->cpu_mask
, GFP_KERNEL
))
1292 nvmeq
->q_dmadev
= dmadev
;
1294 snprintf(nvmeq
->irqname
, sizeof(nvmeq
->irqname
), "nvme%dq%d",
1295 dev
->instance
, qid
);
1296 spin_lock_init(&nvmeq
->q_lock
);
1298 nvmeq
->cq_phase
= 1;
1299 init_waitqueue_head(&nvmeq
->sq_full
);
1300 init_waitqueue_entry(&nvmeq
->sq_cong_wait
, nvme_thread
);
1301 bio_list_init(&nvmeq
->sq_cong
);
1302 INIT_LIST_HEAD(&nvmeq
->iod_bio
);
1303 nvmeq
->q_db
= &dev
->dbs
[qid
* 2 * dev
->db_stride
];
1304 nvmeq
->q_depth
= depth
;
1305 nvmeq
->cq_vector
= vector
;
1307 nvmeq
->q_suspended
= 1;
1309 rcu_assign_pointer(dev
->queues
[qid
], nvmeq
);
1314 dma_free_coherent(dmadev
, SQ_SIZE(depth
), (void *)nvmeq
->sq_cmds
,
1315 nvmeq
->sq_dma_addr
);
1317 dma_free_coherent(dmadev
, CQ_SIZE(depth
), (void *)nvmeq
->cqes
,
1318 nvmeq
->cq_dma_addr
);
1324 static int queue_request_irq(struct nvme_dev
*dev
, struct nvme_queue
*nvmeq
,
1327 if (use_threaded_interrupts
)
1328 return request_threaded_irq(dev
->entry
[nvmeq
->cq_vector
].vector
,
1329 nvme_irq_check
, nvme_irq
, IRQF_SHARED
,
1331 return request_irq(dev
->entry
[nvmeq
->cq_vector
].vector
, nvme_irq
,
1332 IRQF_SHARED
, name
, nvmeq
);
1335 static void nvme_init_queue(struct nvme_queue
*nvmeq
, u16 qid
)
1337 struct nvme_dev
*dev
= nvmeq
->dev
;
1338 unsigned extra
= nvme_queue_extra(nvmeq
->q_depth
);
1342 nvmeq
->cq_phase
= 1;
1343 nvmeq
->q_db
= &dev
->dbs
[qid
* 2 * dev
->db_stride
];
1344 memset(nvmeq
->cmdid_data
, 0, extra
);
1345 memset((void *)nvmeq
->cqes
, 0, CQ_SIZE(nvmeq
->q_depth
));
1346 nvme_cancel_ios(nvmeq
, false);
1347 nvmeq
->q_suspended
= 0;
1348 dev
->online_queues
++;
1351 static int nvme_create_queue(struct nvme_queue
*nvmeq
, int qid
)
1353 struct nvme_dev
*dev
= nvmeq
->dev
;
1356 result
= adapter_alloc_cq(dev
, qid
, nvmeq
);
1360 result
= adapter_alloc_sq(dev
, qid
, nvmeq
);
1364 result
= queue_request_irq(dev
, nvmeq
, nvmeq
->irqname
);
1368 spin_lock_irq(&nvmeq
->q_lock
);
1369 nvme_init_queue(nvmeq
, qid
);
1370 spin_unlock_irq(&nvmeq
->q_lock
);
1375 adapter_delete_sq(dev
, qid
);
1377 adapter_delete_cq(dev
, qid
);
1381 static int nvme_wait_ready(struct nvme_dev
*dev
, u64 cap
, bool enabled
)
1383 unsigned long timeout
;
1384 u32 bit
= enabled
? NVME_CSTS_RDY
: 0;
1386 timeout
= ((NVME_CAP_TIMEOUT(cap
) + 1) * HZ
/ 2) + jiffies
;
1388 while ((readl(&dev
->bar
->csts
) & NVME_CSTS_RDY
) != bit
) {
1390 if (fatal_signal_pending(current
))
1392 if (time_after(jiffies
, timeout
)) {
1393 dev_err(&dev
->pci_dev
->dev
,
1394 "Device not ready; aborting %s\n", enabled
?
1395 "initialisation" : "reset");
1404 * If the device has been passed off to us in an enabled state, just clear
1405 * the enabled bit. The spec says we should set the 'shutdown notification
1406 * bits', but doing so may cause the device to complete commands to the
1407 * admin queue ... and we don't know what memory that might be pointing at!
1409 static int nvme_disable_ctrl(struct nvme_dev
*dev
, u64 cap
)
1411 u32 cc
= readl(&dev
->bar
->cc
);
1413 if (cc
& NVME_CC_ENABLE
)
1414 writel(cc
& ~NVME_CC_ENABLE
, &dev
->bar
->cc
);
1415 return nvme_wait_ready(dev
, cap
, false);
1418 static int nvme_enable_ctrl(struct nvme_dev
*dev
, u64 cap
)
1420 return nvme_wait_ready(dev
, cap
, true);
1423 static int nvme_shutdown_ctrl(struct nvme_dev
*dev
)
1425 unsigned long timeout
;
1428 cc
= (readl(&dev
->bar
->cc
) & ~NVME_CC_SHN_MASK
) | NVME_CC_SHN_NORMAL
;
1429 writel(cc
, &dev
->bar
->cc
);
1431 timeout
= 2 * HZ
+ jiffies
;
1432 while ((readl(&dev
->bar
->csts
) & NVME_CSTS_SHST_MASK
) !=
1433 NVME_CSTS_SHST_CMPLT
) {
1435 if (fatal_signal_pending(current
))
1437 if (time_after(jiffies
, timeout
)) {
1438 dev_err(&dev
->pci_dev
->dev
,
1439 "Device shutdown incomplete; abort shutdown\n");
1447 static int nvme_configure_admin_queue(struct nvme_dev
*dev
)
1451 u64 cap
= readq(&dev
->bar
->cap
);
1452 struct nvme_queue
*nvmeq
;
1454 result
= nvme_disable_ctrl(dev
, cap
);
1458 nvmeq
= raw_nvmeq(dev
, 0);
1460 nvmeq
= nvme_alloc_queue(dev
, 0, 64, 0);
1465 aqa
= nvmeq
->q_depth
- 1;
1468 dev
->ctrl_config
= NVME_CC_ENABLE
| NVME_CC_CSS_NVM
;
1469 dev
->ctrl_config
|= (PAGE_SHIFT
- 12) << NVME_CC_MPS_SHIFT
;
1470 dev
->ctrl_config
|= NVME_CC_ARB_RR
| NVME_CC_SHN_NONE
;
1471 dev
->ctrl_config
|= NVME_CC_IOSQES
| NVME_CC_IOCQES
;
1473 writel(aqa
, &dev
->bar
->aqa
);
1474 writeq(nvmeq
->sq_dma_addr
, &dev
->bar
->asq
);
1475 writeq(nvmeq
->cq_dma_addr
, &dev
->bar
->acq
);
1476 writel(dev
->ctrl_config
, &dev
->bar
->cc
);
1478 result
= nvme_enable_ctrl(dev
, cap
);
1482 result
= queue_request_irq(dev
, nvmeq
, nvmeq
->irqname
);
1486 spin_lock_irq(&nvmeq
->q_lock
);
1487 nvme_init_queue(nvmeq
, 0);
1488 spin_unlock_irq(&nvmeq
->q_lock
);
1492 struct nvme_iod
*nvme_map_user_pages(struct nvme_dev
*dev
, int write
,
1493 unsigned long addr
, unsigned length
)
1495 int i
, err
, count
, nents
, offset
;
1496 struct scatterlist
*sg
;
1497 struct page
**pages
;
1498 struct nvme_iod
*iod
;
1501 return ERR_PTR(-EINVAL
);
1502 if (!length
|| length
> INT_MAX
- PAGE_SIZE
)
1503 return ERR_PTR(-EINVAL
);
1505 offset
= offset_in_page(addr
);
1506 count
= DIV_ROUND_UP(offset
+ length
, PAGE_SIZE
);
1507 pages
= kcalloc(count
, sizeof(*pages
), GFP_KERNEL
);
1509 return ERR_PTR(-ENOMEM
);
1511 err
= get_user_pages_fast(addr
, count
, 1, pages
);
1519 iod
= nvme_alloc_iod(count
, length
, GFP_KERNEL
);
1524 sg_init_table(sg
, count
);
1525 for (i
= 0; i
< count
; i
++) {
1526 sg_set_page(&sg
[i
], pages
[i
],
1527 min_t(unsigned, length
, PAGE_SIZE
- offset
),
1529 length
-= (PAGE_SIZE
- offset
);
1532 sg_mark_end(&sg
[i
- 1]);
1535 nents
= dma_map_sg(&dev
->pci_dev
->dev
, sg
, count
,
1536 write
? DMA_TO_DEVICE
: DMA_FROM_DEVICE
);
1546 for (i
= 0; i
< count
; i
++)
1549 return ERR_PTR(err
);
1552 void nvme_unmap_user_pages(struct nvme_dev
*dev
, int write
,
1553 struct nvme_iod
*iod
)
1557 dma_unmap_sg(&dev
->pci_dev
->dev
, iod
->sg
, iod
->nents
,
1558 write
? DMA_TO_DEVICE
: DMA_FROM_DEVICE
);
1560 for (i
= 0; i
< iod
->nents
; i
++)
1561 put_page(sg_page(&iod
->sg
[i
]));
1564 static int nvme_submit_io(struct nvme_ns
*ns
, struct nvme_user_io __user
*uio
)
1566 struct nvme_dev
*dev
= ns
->dev
;
1567 struct nvme_user_io io
;
1568 struct nvme_command c
;
1569 unsigned length
, meta_len
;
1571 struct nvme_iod
*iod
, *meta_iod
= NULL
;
1572 dma_addr_t meta_dma_addr
;
1573 void *meta
, *uninitialized_var(meta_mem
);
1575 if (copy_from_user(&io
, uio
, sizeof(io
)))
1577 length
= (io
.nblocks
+ 1) << ns
->lba_shift
;
1578 meta_len
= (io
.nblocks
+ 1) * ns
->ms
;
1580 if (meta_len
&& ((io
.metadata
& 3) || !io
.metadata
))
1583 switch (io
.opcode
) {
1584 case nvme_cmd_write
:
1586 case nvme_cmd_compare
:
1587 iod
= nvme_map_user_pages(dev
, io
.opcode
& 1, io
.addr
, length
);
1594 return PTR_ERR(iod
);
1596 memset(&c
, 0, sizeof(c
));
1597 c
.rw
.opcode
= io
.opcode
;
1598 c
.rw
.flags
= io
.flags
;
1599 c
.rw
.nsid
= cpu_to_le32(ns
->ns_id
);
1600 c
.rw
.slba
= cpu_to_le64(io
.slba
);
1601 c
.rw
.length
= cpu_to_le16(io
.nblocks
);
1602 c
.rw
.control
= cpu_to_le16(io
.control
);
1603 c
.rw
.dsmgmt
= cpu_to_le32(io
.dsmgmt
);
1604 c
.rw
.reftag
= cpu_to_le32(io
.reftag
);
1605 c
.rw
.apptag
= cpu_to_le16(io
.apptag
);
1606 c
.rw
.appmask
= cpu_to_le16(io
.appmask
);
1609 meta_iod
= nvme_map_user_pages(dev
, io
.opcode
& 1, io
.metadata
,
1611 if (IS_ERR(meta_iod
)) {
1612 status
= PTR_ERR(meta_iod
);
1617 meta_mem
= dma_alloc_coherent(&dev
->pci_dev
->dev
, meta_len
,
1618 &meta_dma_addr
, GFP_KERNEL
);
1624 if (io
.opcode
& 1) {
1625 int meta_offset
= 0;
1627 for (i
= 0; i
< meta_iod
->nents
; i
++) {
1628 meta
= kmap_atomic(sg_page(&meta_iod
->sg
[i
])) +
1629 meta_iod
->sg
[i
].offset
;
1630 memcpy(meta_mem
+ meta_offset
, meta
,
1631 meta_iod
->sg
[i
].length
);
1632 kunmap_atomic(meta
);
1633 meta_offset
+= meta_iod
->sg
[i
].length
;
1637 c
.rw
.metadata
= cpu_to_le64(meta_dma_addr
);
1640 length
= nvme_setup_prps(dev
, iod
, length
, GFP_KERNEL
);
1641 c
.rw
.prp1
= cpu_to_le64(sg_dma_address(iod
->sg
));
1642 c
.rw
.prp2
= cpu_to_le64(iod
->first_dma
);
1644 if (length
!= (io
.nblocks
+ 1) << ns
->lba_shift
)
1647 status
= nvme_submit_io_cmd(dev
, &c
, NULL
);
1650 if (status
== NVME_SC_SUCCESS
&& !(io
.opcode
& 1)) {
1651 int meta_offset
= 0;
1653 for (i
= 0; i
< meta_iod
->nents
; i
++) {
1654 meta
= kmap_atomic(sg_page(&meta_iod
->sg
[i
])) +
1655 meta_iod
->sg
[i
].offset
;
1656 memcpy(meta
, meta_mem
+ meta_offset
,
1657 meta_iod
->sg
[i
].length
);
1658 kunmap_atomic(meta
);
1659 meta_offset
+= meta_iod
->sg
[i
].length
;
1663 dma_free_coherent(&dev
->pci_dev
->dev
, meta_len
, meta_mem
,
1668 nvme_unmap_user_pages(dev
, io
.opcode
& 1, iod
);
1669 nvme_free_iod(dev
, iod
);
1672 nvme_unmap_user_pages(dev
, io
.opcode
& 1, meta_iod
);
1673 nvme_free_iod(dev
, meta_iod
);
1679 static int nvme_user_admin_cmd(struct nvme_dev
*dev
,
1680 struct nvme_admin_cmd __user
*ucmd
)
1682 struct nvme_admin_cmd cmd
;
1683 struct nvme_command c
;
1685 struct nvme_iod
*uninitialized_var(iod
);
1688 if (!capable(CAP_SYS_ADMIN
))
1690 if (copy_from_user(&cmd
, ucmd
, sizeof(cmd
)))
1693 memset(&c
, 0, sizeof(c
));
1694 c
.common
.opcode
= cmd
.opcode
;
1695 c
.common
.flags
= cmd
.flags
;
1696 c
.common
.nsid
= cpu_to_le32(cmd
.nsid
);
1697 c
.common
.cdw2
[0] = cpu_to_le32(cmd
.cdw2
);
1698 c
.common
.cdw2
[1] = cpu_to_le32(cmd
.cdw3
);
1699 c
.common
.cdw10
[0] = cpu_to_le32(cmd
.cdw10
);
1700 c
.common
.cdw10
[1] = cpu_to_le32(cmd
.cdw11
);
1701 c
.common
.cdw10
[2] = cpu_to_le32(cmd
.cdw12
);
1702 c
.common
.cdw10
[3] = cpu_to_le32(cmd
.cdw13
);
1703 c
.common
.cdw10
[4] = cpu_to_le32(cmd
.cdw14
);
1704 c
.common
.cdw10
[5] = cpu_to_le32(cmd
.cdw15
);
1706 length
= cmd
.data_len
;
1708 iod
= nvme_map_user_pages(dev
, cmd
.opcode
& 1, cmd
.addr
,
1711 return PTR_ERR(iod
);
1712 length
= nvme_setup_prps(dev
, iod
, length
, GFP_KERNEL
);
1713 c
.common
.prp1
= cpu_to_le64(sg_dma_address(iod
->sg
));
1714 c
.common
.prp2
= cpu_to_le64(iod
->first_dma
);
1717 timeout
= cmd
.timeout_ms
? msecs_to_jiffies(cmd
.timeout_ms
) :
1719 if (length
!= cmd
.data_len
)
1722 status
= nvme_submit_sync_cmd(dev
, 0, &c
, &cmd
.result
, timeout
);
1725 nvme_unmap_user_pages(dev
, cmd
.opcode
& 1, iod
);
1726 nvme_free_iod(dev
, iod
);
1729 if ((status
>= 0) && copy_to_user(&ucmd
->result
, &cmd
.result
,
1730 sizeof(cmd
.result
)))
1736 static int nvme_ioctl(struct block_device
*bdev
, fmode_t mode
, unsigned int cmd
,
1739 struct nvme_ns
*ns
= bdev
->bd_disk
->private_data
;
1743 force_successful_syscall_return();
1745 case NVME_IOCTL_ADMIN_CMD
:
1746 return nvme_user_admin_cmd(ns
->dev
, (void __user
*)arg
);
1747 case NVME_IOCTL_SUBMIT_IO
:
1748 return nvme_submit_io(ns
, (void __user
*)arg
);
1749 case SG_GET_VERSION_NUM
:
1750 return nvme_sg_get_version_num((void __user
*)arg
);
1752 return nvme_sg_io(ns
, (void __user
*)arg
);
1758 #ifdef CONFIG_COMPAT
1759 static int nvme_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1760 unsigned int cmd
, unsigned long arg
)
1762 struct nvme_ns
*ns
= bdev
->bd_disk
->private_data
;
1766 return nvme_sg_io32(ns
, arg
);
1768 return nvme_ioctl(bdev
, mode
, cmd
, arg
);
1771 #define nvme_compat_ioctl NULL
1774 static int nvme_open(struct block_device
*bdev
, fmode_t mode
)
1776 struct nvme_ns
*ns
= bdev
->bd_disk
->private_data
;
1777 struct nvme_dev
*dev
= ns
->dev
;
1779 kref_get(&dev
->kref
);
1783 static void nvme_free_dev(struct kref
*kref
);
1785 static void nvme_release(struct gendisk
*disk
, fmode_t mode
)
1787 struct nvme_ns
*ns
= disk
->private_data
;
1788 struct nvme_dev
*dev
= ns
->dev
;
1790 kref_put(&dev
->kref
, nvme_free_dev
);
1793 static int nvme_getgeo(struct block_device
*bd
, struct hd_geometry
*geo
)
1795 /* some standard values */
1796 geo
->heads
= 1 << 6;
1797 geo
->sectors
= 1 << 5;
1798 geo
->cylinders
= get_capacity(bd
->bd_disk
) >> 11;
1802 static const struct block_device_operations nvme_fops
= {
1803 .owner
= THIS_MODULE
,
1804 .ioctl
= nvme_ioctl
,
1805 .compat_ioctl
= nvme_compat_ioctl
,
1807 .release
= nvme_release
,
1808 .getgeo
= nvme_getgeo
,
1811 static void nvme_resubmit_iods(struct nvme_queue
*nvmeq
)
1813 struct nvme_iod
*iod
, *next
;
1815 list_for_each_entry_safe(iod
, next
, &nvmeq
->iod_bio
, node
) {
1816 if (unlikely(nvme_submit_iod(nvmeq
, iod
)))
1818 list_del(&iod
->node
);
1819 if (bio_list_empty(&nvmeq
->sq_cong
) &&
1820 list_empty(&nvmeq
->iod_bio
))
1821 remove_wait_queue(&nvmeq
->sq_full
,
1822 &nvmeq
->sq_cong_wait
);
1826 static void nvme_resubmit_bios(struct nvme_queue
*nvmeq
)
1828 while (bio_list_peek(&nvmeq
->sq_cong
)) {
1829 struct bio
*bio
= bio_list_pop(&nvmeq
->sq_cong
);
1830 struct nvme_ns
*ns
= bio
->bi_bdev
->bd_disk
->private_data
;
1832 if (bio_list_empty(&nvmeq
->sq_cong
) &&
1833 list_empty(&nvmeq
->iod_bio
))
1834 remove_wait_queue(&nvmeq
->sq_full
,
1835 &nvmeq
->sq_cong_wait
);
1836 if (nvme_submit_bio_queue(nvmeq
, ns
, bio
)) {
1837 if (!waitqueue_active(&nvmeq
->sq_full
))
1838 add_wait_queue(&nvmeq
->sq_full
,
1839 &nvmeq
->sq_cong_wait
);
1840 bio_list_add_head(&nvmeq
->sq_cong
, bio
);
1846 static int nvme_kthread(void *data
)
1848 struct nvme_dev
*dev
, *next
;
1850 while (!kthread_should_stop()) {
1851 set_current_state(TASK_INTERRUPTIBLE
);
1852 spin_lock(&dev_list_lock
);
1853 list_for_each_entry_safe(dev
, next
, &dev_list
, node
) {
1855 if (readl(&dev
->bar
->csts
) & NVME_CSTS_CFS
&&
1857 if (work_busy(&dev
->reset_work
))
1859 list_del_init(&dev
->node
);
1860 dev_warn(&dev
->pci_dev
->dev
,
1861 "Failed status, reset controller\n");
1862 dev
->reset_workfn
= nvme_reset_failed_dev
;
1863 queue_work(nvme_workq
, &dev
->reset_work
);
1867 for (i
= 0; i
< dev
->queue_count
; i
++) {
1868 struct nvme_queue
*nvmeq
=
1869 rcu_dereference(dev
->queues
[i
]);
1872 spin_lock_irq(&nvmeq
->q_lock
);
1873 if (nvmeq
->q_suspended
)
1875 nvme_process_cq(nvmeq
);
1876 nvme_cancel_ios(nvmeq
, true);
1877 nvme_resubmit_bios(nvmeq
);
1878 nvme_resubmit_iods(nvmeq
);
1880 spin_unlock_irq(&nvmeq
->q_lock
);
1884 spin_unlock(&dev_list_lock
);
1885 schedule_timeout(round_jiffies_relative(HZ
));
1890 static void nvme_config_discard(struct nvme_ns
*ns
)
1892 u32 logical_block_size
= queue_logical_block_size(ns
->queue
);
1893 ns
->queue
->limits
.discard_zeroes_data
= 0;
1894 ns
->queue
->limits
.discard_alignment
= logical_block_size
;
1895 ns
->queue
->limits
.discard_granularity
= logical_block_size
;
1896 ns
->queue
->limits
.max_discard_sectors
= 0xffffffff;
1897 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, ns
->queue
);
1900 static struct nvme_ns
*nvme_alloc_ns(struct nvme_dev
*dev
, unsigned nsid
,
1901 struct nvme_id_ns
*id
, struct nvme_lba_range_type
*rt
)
1904 struct gendisk
*disk
;
1907 if (rt
->attributes
& NVME_LBART_ATTRIB_HIDE
)
1910 ns
= kzalloc(sizeof(*ns
), GFP_KERNEL
);
1913 ns
->queue
= blk_alloc_queue(GFP_KERNEL
);
1916 ns
->queue
->queue_flags
= QUEUE_FLAG_DEFAULT
;
1917 queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES
, ns
->queue
);
1918 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, ns
->queue
);
1919 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM
, ns
->queue
);
1920 blk_queue_make_request(ns
->queue
, nvme_make_request
);
1922 ns
->queue
->queuedata
= ns
;
1924 disk
= alloc_disk(0);
1926 goto out_free_queue
;
1929 lbaf
= id
->flbas
& 0xf;
1930 ns
->lba_shift
= id
->lbaf
[lbaf
].ds
;
1931 ns
->ms
= le16_to_cpu(id
->lbaf
[lbaf
].ms
);
1932 blk_queue_logical_block_size(ns
->queue
, 1 << ns
->lba_shift
);
1933 if (dev
->max_hw_sectors
)
1934 blk_queue_max_hw_sectors(ns
->queue
, dev
->max_hw_sectors
);
1935 if (dev
->vwc
& NVME_CTRL_VWC_PRESENT
)
1936 blk_queue_flush(ns
->queue
, REQ_FLUSH
| REQ_FUA
);
1938 disk
->major
= nvme_major
;
1939 disk
->first_minor
= 0;
1940 disk
->fops
= &nvme_fops
;
1941 disk
->private_data
= ns
;
1942 disk
->queue
= ns
->queue
;
1943 disk
->driverfs_dev
= &dev
->pci_dev
->dev
;
1944 disk
->flags
= GENHD_FL_EXT_DEVT
;
1945 sprintf(disk
->disk_name
, "nvme%dn%d", dev
->instance
, nsid
);
1946 set_capacity(disk
, le64_to_cpup(&id
->nsze
) << (ns
->lba_shift
- 9));
1948 if (dev
->oncs
& NVME_CTRL_ONCS_DSM
)
1949 nvme_config_discard(ns
);
1954 blk_cleanup_queue(ns
->queue
);
1960 static int nvme_find_closest_node(int node
)
1962 int n
, val
, min_val
= INT_MAX
, best_node
= node
;
1964 for_each_online_node(n
) {
1967 val
= node_distance(node
, n
);
1968 if (val
< min_val
) {
1976 static void nvme_set_queue_cpus(cpumask_t
*qmask
, struct nvme_queue
*nvmeq
,
1980 for_each_cpu(cpu
, qmask
) {
1981 if (cpumask_weight(nvmeq
->cpu_mask
) >= count
)
1983 if (!cpumask_test_and_set_cpu(cpu
, nvmeq
->cpu_mask
))
1984 *per_cpu_ptr(nvmeq
->dev
->io_queue
, cpu
) = nvmeq
->qid
;
1988 static void nvme_add_cpus(cpumask_t
*mask
, const cpumask_t
*unassigned_cpus
,
1989 const cpumask_t
*new_mask
, struct nvme_queue
*nvmeq
, int cpus_per_queue
)
1992 for_each_cpu(next_cpu
, new_mask
) {
1993 cpumask_or(mask
, mask
, get_cpu_mask(next_cpu
));
1994 cpumask_or(mask
, mask
, topology_thread_cpumask(next_cpu
));
1995 cpumask_and(mask
, mask
, unassigned_cpus
);
1996 nvme_set_queue_cpus(mask
, nvmeq
, cpus_per_queue
);
2000 static void nvme_create_io_queues(struct nvme_dev
*dev
)
2004 max
= min(dev
->max_qid
, num_online_cpus());
2005 for (i
= dev
->queue_count
; i
<= max
; i
++)
2006 if (!nvme_alloc_queue(dev
, i
, dev
->q_depth
, i
- 1))
2009 max
= min(dev
->queue_count
- 1, num_online_cpus());
2010 for (i
= dev
->online_queues
; i
<= max
; i
++)
2011 if (nvme_create_queue(raw_nvmeq(dev
, i
), i
))
2016 * If there are fewer queues than online cpus, this will try to optimally
2017 * assign a queue to multiple cpus by grouping cpus that are "close" together:
2018 * thread siblings, core, socket, closest node, then whatever else is
2021 static void nvme_assign_io_queues(struct nvme_dev
*dev
)
2023 unsigned cpu
, cpus_per_queue
, queues
, remainder
, i
;
2024 cpumask_var_t unassigned_cpus
;
2026 nvme_create_io_queues(dev
);
2028 queues
= min(dev
->online_queues
- 1, num_online_cpus());
2032 cpus_per_queue
= num_online_cpus() / queues
;
2033 remainder
= queues
- (num_online_cpus() - queues
* cpus_per_queue
);
2035 if (!alloc_cpumask_var(&unassigned_cpus
, GFP_KERNEL
))
2038 cpumask_copy(unassigned_cpus
, cpu_online_mask
);
2039 cpu
= cpumask_first(unassigned_cpus
);
2040 for (i
= 1; i
<= queues
; i
++) {
2041 struct nvme_queue
*nvmeq
= lock_nvmeq(dev
, i
);
2044 cpumask_clear(nvmeq
->cpu_mask
);
2045 if (!cpumask_weight(unassigned_cpus
)) {
2046 unlock_nvmeq(nvmeq
);
2050 mask
= *get_cpu_mask(cpu
);
2051 nvme_set_queue_cpus(&mask
, nvmeq
, cpus_per_queue
);
2052 if (cpus_weight(mask
) < cpus_per_queue
)
2053 nvme_add_cpus(&mask
, unassigned_cpus
,
2054 topology_thread_cpumask(cpu
),
2055 nvmeq
, cpus_per_queue
);
2056 if (cpus_weight(mask
) < cpus_per_queue
)
2057 nvme_add_cpus(&mask
, unassigned_cpus
,
2058 topology_core_cpumask(cpu
),
2059 nvmeq
, cpus_per_queue
);
2060 if (cpus_weight(mask
) < cpus_per_queue
)
2061 nvme_add_cpus(&mask
, unassigned_cpus
,
2062 cpumask_of_node(cpu_to_node(cpu
)),
2063 nvmeq
, cpus_per_queue
);
2064 if (cpus_weight(mask
) < cpus_per_queue
)
2065 nvme_add_cpus(&mask
, unassigned_cpus
,
2067 nvme_find_closest_node(
2069 nvmeq
, cpus_per_queue
);
2070 if (cpus_weight(mask
) < cpus_per_queue
)
2071 nvme_add_cpus(&mask
, unassigned_cpus
,
2073 nvmeq
, cpus_per_queue
);
2075 WARN(cpumask_weight(nvmeq
->cpu_mask
) != cpus_per_queue
,
2076 "nvme%d qid:%d mis-matched queue-to-cpu assignment\n",
2079 irq_set_affinity_hint(dev
->entry
[nvmeq
->cq_vector
].vector
,
2081 cpumask_andnot(unassigned_cpus
, unassigned_cpus
,
2083 cpu
= cpumask_next(cpu
, unassigned_cpus
);
2084 if (remainder
&& !--remainder
)
2086 unlock_nvmeq(nvmeq
);
2088 WARN(cpumask_weight(unassigned_cpus
), "nvme%d unassigned online cpus\n",
2091 cpumask_andnot(unassigned_cpus
, cpu_possible_mask
, cpu_online_mask
);
2092 for_each_cpu(cpu
, unassigned_cpus
)
2093 *per_cpu_ptr(dev
->io_queue
, cpu
) = (i
++ % queues
) + 1;
2094 free_cpumask_var(unassigned_cpus
);
2097 static int set_queue_count(struct nvme_dev
*dev
, int count
)
2101 u32 q_count
= (count
- 1) | ((count
- 1) << 16);
2103 status
= nvme_set_features(dev
, NVME_FEAT_NUM_QUEUES
, q_count
, 0,
2108 dev_err(&dev
->pci_dev
->dev
, "Could not set queue count (%d)\n",
2112 return min(result
& 0xffff, result
>> 16) + 1;
2115 static size_t db_bar_size(struct nvme_dev
*dev
, unsigned nr_io_queues
)
2117 return 4096 + ((nr_io_queues
+ 1) * 8 * dev
->db_stride
);
2120 static void nvme_cpu_workfn(struct work_struct
*work
)
2122 struct nvme_dev
*dev
= container_of(work
, struct nvme_dev
, cpu_work
);
2123 if (dev
->initialized
)
2124 nvme_assign_io_queues(dev
);
2127 static int nvme_cpu_notify(struct notifier_block
*self
,
2128 unsigned long action
, void *hcpu
)
2130 struct nvme_dev
*dev
;
2135 spin_lock(&dev_list_lock
);
2136 list_for_each_entry(dev
, &dev_list
, node
)
2137 schedule_work(&dev
->cpu_work
);
2138 spin_unlock(&dev_list_lock
);
2144 static int nvme_setup_io_queues(struct nvme_dev
*dev
)
2146 struct nvme_queue
*adminq
= raw_nvmeq(dev
, 0);
2147 struct pci_dev
*pdev
= dev
->pci_dev
;
2148 int result
, i
, vecs
, nr_io_queues
, size
;
2150 nr_io_queues
= num_possible_cpus();
2151 result
= set_queue_count(dev
, nr_io_queues
);
2154 if (result
< nr_io_queues
)
2155 nr_io_queues
= result
;
2157 size
= db_bar_size(dev
, nr_io_queues
);
2161 dev
->bar
= ioremap(pci_resource_start(pdev
, 0), size
);
2164 if (!--nr_io_queues
)
2166 size
= db_bar_size(dev
, nr_io_queues
);
2168 dev
->dbs
= ((void __iomem
*)dev
->bar
) + 4096;
2169 adminq
->q_db
= dev
->dbs
;
2172 /* Deregister the admin queue's interrupt */
2173 free_irq(dev
->entry
[0].vector
, adminq
);
2175 for (i
= 0; i
< nr_io_queues
; i
++)
2176 dev
->entry
[i
].entry
= i
;
2177 vecs
= pci_enable_msix_range(pdev
, dev
->entry
, 1, nr_io_queues
);
2179 vecs
= pci_enable_msi_range(pdev
, 1, min(nr_io_queues
, 32));
2183 for (i
= 0; i
< vecs
; i
++)
2184 dev
->entry
[i
].vector
= i
+ pdev
->irq
;
2189 * Should investigate if there's a performance win from allocating
2190 * more queues than interrupt vectors; it might allow the submission
2191 * path to scale better, even if the receive path is limited by the
2192 * number of interrupts.
2194 nr_io_queues
= vecs
;
2195 dev
->max_qid
= nr_io_queues
;
2197 result
= queue_request_irq(dev
, adminq
, adminq
->irqname
);
2199 adminq
->q_suspended
= 1;
2203 /* Free previously allocated queues that are no longer usable */
2204 nvme_free_queues(dev
, nr_io_queues
+ 1);
2205 nvme_assign_io_queues(dev
);
2210 nvme_free_queues(dev
, 1);
2215 * Return: error value if an error occurred setting up the queues or calling
2216 * Identify Device. 0 if these succeeded, even if adding some of the
2217 * namespaces failed. At the moment, these failures are silent. TBD which
2218 * failures should be reported.
2220 static int nvme_dev_add(struct nvme_dev
*dev
)
2222 struct pci_dev
*pdev
= dev
->pci_dev
;
2226 struct nvme_id_ctrl
*ctrl
;
2227 struct nvme_id_ns
*id_ns
;
2229 dma_addr_t dma_addr
;
2230 int shift
= NVME_CAP_MPSMIN(readq(&dev
->bar
->cap
)) + 12;
2232 mem
= dma_alloc_coherent(&pdev
->dev
, 8192, &dma_addr
, GFP_KERNEL
);
2236 res
= nvme_identify(dev
, 0, 1, dma_addr
);
2238 dev_err(&pdev
->dev
, "Identify Controller failed (%d)\n", res
);
2244 nn
= le32_to_cpup(&ctrl
->nn
);
2245 dev
->oncs
= le16_to_cpup(&ctrl
->oncs
);
2246 dev
->abort_limit
= ctrl
->acl
+ 1;
2247 dev
->vwc
= ctrl
->vwc
;
2248 memcpy(dev
->serial
, ctrl
->sn
, sizeof(ctrl
->sn
));
2249 memcpy(dev
->model
, ctrl
->mn
, sizeof(ctrl
->mn
));
2250 memcpy(dev
->firmware_rev
, ctrl
->fr
, sizeof(ctrl
->fr
));
2252 dev
->max_hw_sectors
= 1 << (ctrl
->mdts
+ shift
- 9);
2253 if ((pdev
->vendor
== PCI_VENDOR_ID_INTEL
) &&
2254 (pdev
->device
== 0x0953) && ctrl
->vs
[3])
2255 dev
->stripe_size
= 1 << (ctrl
->vs
[3] + shift
);
2258 for (i
= 1; i
<= nn
; i
++) {
2259 res
= nvme_identify(dev
, i
, 0, dma_addr
);
2263 if (id_ns
->ncap
== 0)
2266 res
= nvme_get_features(dev
, NVME_FEAT_LBA_RANGE
, i
,
2267 dma_addr
+ 4096, NULL
);
2269 memset(mem
+ 4096, 0, 4096);
2271 ns
= nvme_alloc_ns(dev
, i
, mem
, mem
+ 4096);
2273 list_add_tail(&ns
->list
, &dev
->namespaces
);
2275 list_for_each_entry(ns
, &dev
->namespaces
, list
)
2280 dma_free_coherent(&dev
->pci_dev
->dev
, 8192, mem
, dma_addr
);
2284 static int nvme_dev_map(struct nvme_dev
*dev
)
2287 int bars
, result
= -ENOMEM
;
2288 struct pci_dev
*pdev
= dev
->pci_dev
;
2290 if (pci_enable_device_mem(pdev
))
2293 dev
->entry
[0].vector
= pdev
->irq
;
2294 pci_set_master(pdev
);
2295 bars
= pci_select_bars(pdev
, IORESOURCE_MEM
);
2296 if (pci_request_selected_regions(pdev
, bars
, "nvme"))
2299 if (dma_set_mask_and_coherent(&pdev
->dev
, DMA_BIT_MASK(64)) &&
2300 dma_set_mask_and_coherent(&pdev
->dev
, DMA_BIT_MASK(32)))
2303 dev
->bar
= ioremap(pci_resource_start(pdev
, 0), 8192);
2306 if (readl(&dev
->bar
->csts
) == -1) {
2310 cap
= readq(&dev
->bar
->cap
);
2311 dev
->q_depth
= min_t(int, NVME_CAP_MQES(cap
) + 1, NVME_Q_DEPTH
);
2312 dev
->db_stride
= 1 << NVME_CAP_STRIDE(cap
);
2313 dev
->dbs
= ((void __iomem
*)dev
->bar
) + 4096;
2321 pci_release_regions(pdev
);
2323 pci_disable_device(pdev
);
2327 static void nvme_dev_unmap(struct nvme_dev
*dev
)
2329 if (dev
->pci_dev
->msi_enabled
)
2330 pci_disable_msi(dev
->pci_dev
);
2331 else if (dev
->pci_dev
->msix_enabled
)
2332 pci_disable_msix(dev
->pci_dev
);
2337 pci_release_regions(dev
->pci_dev
);
2340 if (pci_is_enabled(dev
->pci_dev
))
2341 pci_disable_device(dev
->pci_dev
);
2344 struct nvme_delq_ctx
{
2345 struct task_struct
*waiter
;
2346 struct kthread_worker
*worker
;
2350 static void nvme_wait_dq(struct nvme_delq_ctx
*dq
, struct nvme_dev
*dev
)
2352 dq
->waiter
= current
;
2356 set_current_state(TASK_KILLABLE
);
2357 if (!atomic_read(&dq
->refcount
))
2359 if (!schedule_timeout(ADMIN_TIMEOUT
) ||
2360 fatal_signal_pending(current
)) {
2361 set_current_state(TASK_RUNNING
);
2363 nvme_disable_ctrl(dev
, readq(&dev
->bar
->cap
));
2364 nvme_disable_queue(dev
, 0);
2366 send_sig(SIGKILL
, dq
->worker
->task
, 1);
2367 flush_kthread_worker(dq
->worker
);
2371 set_current_state(TASK_RUNNING
);
2374 static void nvme_put_dq(struct nvme_delq_ctx
*dq
)
2376 atomic_dec(&dq
->refcount
);
2378 wake_up_process(dq
->waiter
);
2381 static struct nvme_delq_ctx
*nvme_get_dq(struct nvme_delq_ctx
*dq
)
2383 atomic_inc(&dq
->refcount
);
2387 static void nvme_del_queue_end(struct nvme_queue
*nvmeq
)
2389 struct nvme_delq_ctx
*dq
= nvmeq
->cmdinfo
.ctx
;
2391 nvme_clear_queue(nvmeq
);
2395 static int adapter_async_del_queue(struct nvme_queue
*nvmeq
, u8 opcode
,
2396 kthread_work_func_t fn
)
2398 struct nvme_command c
;
2400 memset(&c
, 0, sizeof(c
));
2401 c
.delete_queue
.opcode
= opcode
;
2402 c
.delete_queue
.qid
= cpu_to_le16(nvmeq
->qid
);
2404 init_kthread_work(&nvmeq
->cmdinfo
.work
, fn
);
2405 return nvme_submit_admin_cmd_async(nvmeq
->dev
, &c
, &nvmeq
->cmdinfo
);
2408 static void nvme_del_cq_work_handler(struct kthread_work
*work
)
2410 struct nvme_queue
*nvmeq
= container_of(work
, struct nvme_queue
,
2412 nvme_del_queue_end(nvmeq
);
2415 static int nvme_delete_cq(struct nvme_queue
*nvmeq
)
2417 return adapter_async_del_queue(nvmeq
, nvme_admin_delete_cq
,
2418 nvme_del_cq_work_handler
);
2421 static void nvme_del_sq_work_handler(struct kthread_work
*work
)
2423 struct nvme_queue
*nvmeq
= container_of(work
, struct nvme_queue
,
2425 int status
= nvmeq
->cmdinfo
.status
;
2428 status
= nvme_delete_cq(nvmeq
);
2430 nvme_del_queue_end(nvmeq
);
2433 static int nvme_delete_sq(struct nvme_queue
*nvmeq
)
2435 return adapter_async_del_queue(nvmeq
, nvme_admin_delete_sq
,
2436 nvme_del_sq_work_handler
);
2439 static void nvme_del_queue_start(struct kthread_work
*work
)
2441 struct nvme_queue
*nvmeq
= container_of(work
, struct nvme_queue
,
2443 allow_signal(SIGKILL
);
2444 if (nvme_delete_sq(nvmeq
))
2445 nvme_del_queue_end(nvmeq
);
2448 static void nvme_disable_io_queues(struct nvme_dev
*dev
)
2451 DEFINE_KTHREAD_WORKER_ONSTACK(worker
);
2452 struct nvme_delq_ctx dq
;
2453 struct task_struct
*kworker_task
= kthread_run(kthread_worker_fn
,
2454 &worker
, "nvme%d", dev
->instance
);
2456 if (IS_ERR(kworker_task
)) {
2457 dev_err(&dev
->pci_dev
->dev
,
2458 "Failed to create queue del task\n");
2459 for (i
= dev
->queue_count
- 1; i
> 0; i
--)
2460 nvme_disable_queue(dev
, i
);
2465 atomic_set(&dq
.refcount
, 0);
2466 dq
.worker
= &worker
;
2467 for (i
= dev
->queue_count
- 1; i
> 0; i
--) {
2468 struct nvme_queue
*nvmeq
= raw_nvmeq(dev
, i
);
2470 if (nvme_suspend_queue(nvmeq
))
2472 nvmeq
->cmdinfo
.ctx
= nvme_get_dq(&dq
);
2473 nvmeq
->cmdinfo
.worker
= dq
.worker
;
2474 init_kthread_work(&nvmeq
->cmdinfo
.work
, nvme_del_queue_start
);
2475 queue_kthread_work(dq
.worker
, &nvmeq
->cmdinfo
.work
);
2477 nvme_wait_dq(&dq
, dev
);
2478 kthread_stop(kworker_task
);
2482 * Remove the node from the device list and check
2483 * for whether or not we need to stop the nvme_thread.
2485 static void nvme_dev_list_remove(struct nvme_dev
*dev
)
2487 struct task_struct
*tmp
= NULL
;
2489 spin_lock(&dev_list_lock
);
2490 list_del_init(&dev
->node
);
2491 if (list_empty(&dev_list
) && !IS_ERR_OR_NULL(nvme_thread
)) {
2495 spin_unlock(&dev_list_lock
);
2501 static void nvme_dev_shutdown(struct nvme_dev
*dev
)
2505 dev
->initialized
= 0;
2506 nvme_dev_list_remove(dev
);
2508 if (!dev
->bar
|| (dev
->bar
&& readl(&dev
->bar
->csts
) == -1)) {
2509 for (i
= dev
->queue_count
- 1; i
>= 0; i
--) {
2510 struct nvme_queue
*nvmeq
= raw_nvmeq(dev
, i
);
2511 nvme_suspend_queue(nvmeq
);
2512 nvme_clear_queue(nvmeq
);
2515 nvme_disable_io_queues(dev
);
2516 nvme_shutdown_ctrl(dev
);
2517 nvme_disable_queue(dev
, 0);
2519 nvme_dev_unmap(dev
);
2522 static void nvme_dev_remove(struct nvme_dev
*dev
)
2526 list_for_each_entry(ns
, &dev
->namespaces
, list
) {
2527 if (ns
->disk
->flags
& GENHD_FL_UP
)
2528 del_gendisk(ns
->disk
);
2529 if (!blk_queue_dying(ns
->queue
))
2530 blk_cleanup_queue(ns
->queue
);
2534 static int nvme_setup_prp_pools(struct nvme_dev
*dev
)
2536 struct device
*dmadev
= &dev
->pci_dev
->dev
;
2537 dev
->prp_page_pool
= dma_pool_create("prp list page", dmadev
,
2538 PAGE_SIZE
, PAGE_SIZE
, 0);
2539 if (!dev
->prp_page_pool
)
2542 /* Optimisation for I/Os between 4k and 128k */
2543 dev
->prp_small_pool
= dma_pool_create("prp list 256", dmadev
,
2545 if (!dev
->prp_small_pool
) {
2546 dma_pool_destroy(dev
->prp_page_pool
);
2552 static void nvme_release_prp_pools(struct nvme_dev
*dev
)
2554 dma_pool_destroy(dev
->prp_page_pool
);
2555 dma_pool_destroy(dev
->prp_small_pool
);
2558 static DEFINE_IDA(nvme_instance_ida
);
2560 static int nvme_set_instance(struct nvme_dev
*dev
)
2562 int instance
, error
;
2565 if (!ida_pre_get(&nvme_instance_ida
, GFP_KERNEL
))
2568 spin_lock(&dev_list_lock
);
2569 error
= ida_get_new(&nvme_instance_ida
, &instance
);
2570 spin_unlock(&dev_list_lock
);
2571 } while (error
== -EAGAIN
);
2576 dev
->instance
= instance
;
2580 static void nvme_release_instance(struct nvme_dev
*dev
)
2582 spin_lock(&dev_list_lock
);
2583 ida_remove(&nvme_instance_ida
, dev
->instance
);
2584 spin_unlock(&dev_list_lock
);
2587 static void nvme_free_namespaces(struct nvme_dev
*dev
)
2589 struct nvme_ns
*ns
, *next
;
2591 list_for_each_entry_safe(ns
, next
, &dev
->namespaces
, list
) {
2592 list_del(&ns
->list
);
2598 static void nvme_free_dev(struct kref
*kref
)
2600 struct nvme_dev
*dev
= container_of(kref
, struct nvme_dev
, kref
);
2602 nvme_free_namespaces(dev
);
2603 free_percpu(dev
->io_queue
);
2609 static int nvme_dev_open(struct inode
*inode
, struct file
*f
)
2611 struct nvme_dev
*dev
= container_of(f
->private_data
, struct nvme_dev
,
2613 kref_get(&dev
->kref
);
2614 f
->private_data
= dev
;
2618 static int nvme_dev_release(struct inode
*inode
, struct file
*f
)
2620 struct nvme_dev
*dev
= f
->private_data
;
2621 kref_put(&dev
->kref
, nvme_free_dev
);
2625 static long nvme_dev_ioctl(struct file
*f
, unsigned int cmd
, unsigned long arg
)
2627 struct nvme_dev
*dev
= f
->private_data
;
2629 case NVME_IOCTL_ADMIN_CMD
:
2630 return nvme_user_admin_cmd(dev
, (void __user
*)arg
);
2636 static const struct file_operations nvme_dev_fops
= {
2637 .owner
= THIS_MODULE
,
2638 .open
= nvme_dev_open
,
2639 .release
= nvme_dev_release
,
2640 .unlocked_ioctl
= nvme_dev_ioctl
,
2641 .compat_ioctl
= nvme_dev_ioctl
,
2644 static int nvme_dev_start(struct nvme_dev
*dev
)
2647 bool start_thread
= false;
2649 result
= nvme_dev_map(dev
);
2653 result
= nvme_configure_admin_queue(dev
);
2657 spin_lock(&dev_list_lock
);
2658 if (list_empty(&dev_list
) && IS_ERR_OR_NULL(nvme_thread
)) {
2659 start_thread
= true;
2662 list_add(&dev
->node
, &dev_list
);
2663 spin_unlock(&dev_list_lock
);
2666 nvme_thread
= kthread_run(nvme_kthread
, NULL
, "nvme");
2667 wake_up(&nvme_kthread_wait
);
2669 wait_event_killable(nvme_kthread_wait
, nvme_thread
);
2671 if (IS_ERR_OR_NULL(nvme_thread
)) {
2672 result
= nvme_thread
? PTR_ERR(nvme_thread
) : -EINTR
;
2676 result
= nvme_setup_io_queues(dev
);
2677 if (result
&& result
!= -EBUSY
)
2683 nvme_disable_queue(dev
, 0);
2684 nvme_dev_list_remove(dev
);
2686 nvme_dev_unmap(dev
);
2690 static int nvme_remove_dead_ctrl(void *arg
)
2692 struct nvme_dev
*dev
= (struct nvme_dev
*)arg
;
2693 struct pci_dev
*pdev
= dev
->pci_dev
;
2695 if (pci_get_drvdata(pdev
))
2696 pci_stop_and_remove_bus_device(pdev
);
2697 kref_put(&dev
->kref
, nvme_free_dev
);
2701 static void nvme_remove_disks(struct work_struct
*ws
)
2703 struct nvme_dev
*dev
= container_of(ws
, struct nvme_dev
, reset_work
);
2705 nvme_dev_remove(dev
);
2706 nvme_free_queues(dev
, 1);
2709 static int nvme_dev_resume(struct nvme_dev
*dev
)
2713 ret
= nvme_dev_start(dev
);
2714 if (ret
&& ret
!= -EBUSY
)
2716 if (ret
== -EBUSY
) {
2717 spin_lock(&dev_list_lock
);
2718 dev
->reset_workfn
= nvme_remove_disks
;
2719 queue_work(nvme_workq
, &dev
->reset_work
);
2720 spin_unlock(&dev_list_lock
);
2722 dev
->initialized
= 1;
2726 static void nvme_dev_reset(struct nvme_dev
*dev
)
2728 nvme_dev_shutdown(dev
);
2729 if (nvme_dev_resume(dev
)) {
2730 dev_err(&dev
->pci_dev
->dev
, "Device failed to resume\n");
2731 kref_get(&dev
->kref
);
2732 if (IS_ERR(kthread_run(nvme_remove_dead_ctrl
, dev
, "nvme%d",
2734 dev_err(&dev
->pci_dev
->dev
,
2735 "Failed to start controller remove task\n");
2736 kref_put(&dev
->kref
, nvme_free_dev
);
2741 static void nvme_reset_failed_dev(struct work_struct
*ws
)
2743 struct nvme_dev
*dev
= container_of(ws
, struct nvme_dev
, reset_work
);
2744 nvme_dev_reset(dev
);
2747 static void nvme_reset_workfn(struct work_struct
*work
)
2749 struct nvme_dev
*dev
= container_of(work
, struct nvme_dev
, reset_work
);
2750 dev
->reset_workfn(work
);
2753 static int nvme_probe(struct pci_dev
*pdev
, const struct pci_device_id
*id
)
2755 int result
= -ENOMEM
;
2756 struct nvme_dev
*dev
;
2758 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
2761 dev
->entry
= kcalloc(num_possible_cpus(), sizeof(*dev
->entry
),
2765 dev
->queues
= kcalloc(num_possible_cpus() + 1, sizeof(void *),
2769 dev
->io_queue
= alloc_percpu(unsigned short);
2773 INIT_LIST_HEAD(&dev
->namespaces
);
2774 dev
->reset_workfn
= nvme_reset_failed_dev
;
2775 INIT_WORK(&dev
->reset_work
, nvme_reset_workfn
);
2776 INIT_WORK(&dev
->cpu_work
, nvme_cpu_workfn
);
2777 dev
->pci_dev
= pdev
;
2778 pci_set_drvdata(pdev
, dev
);
2779 result
= nvme_set_instance(dev
);
2783 result
= nvme_setup_prp_pools(dev
);
2787 kref_init(&dev
->kref
);
2788 result
= nvme_dev_start(dev
);
2790 if (result
== -EBUSY
)
2795 result
= nvme_dev_add(dev
);
2800 scnprintf(dev
->name
, sizeof(dev
->name
), "nvme%d", dev
->instance
);
2801 dev
->miscdev
.minor
= MISC_DYNAMIC_MINOR
;
2802 dev
->miscdev
.parent
= &pdev
->dev
;
2803 dev
->miscdev
.name
= dev
->name
;
2804 dev
->miscdev
.fops
= &nvme_dev_fops
;
2805 result
= misc_register(&dev
->miscdev
);
2809 dev
->initialized
= 1;
2813 nvme_dev_remove(dev
);
2814 nvme_free_namespaces(dev
);
2816 nvme_dev_shutdown(dev
);
2818 nvme_free_queues(dev
, 0);
2819 nvme_release_prp_pools(dev
);
2821 nvme_release_instance(dev
);
2823 free_percpu(dev
->io_queue
);
2830 static void nvme_reset_notify(struct pci_dev
*pdev
, bool prepare
)
2832 struct nvme_dev
*dev
= pci_get_drvdata(pdev
);
2835 nvme_dev_shutdown(dev
);
2837 nvme_dev_resume(dev
);
2840 static void nvme_shutdown(struct pci_dev
*pdev
)
2842 struct nvme_dev
*dev
= pci_get_drvdata(pdev
);
2843 nvme_dev_shutdown(dev
);
2846 static void nvme_remove(struct pci_dev
*pdev
)
2848 struct nvme_dev
*dev
= pci_get_drvdata(pdev
);
2850 spin_lock(&dev_list_lock
);
2851 list_del_init(&dev
->node
);
2852 spin_unlock(&dev_list_lock
);
2854 pci_set_drvdata(pdev
, NULL
);
2855 flush_work(&dev
->reset_work
);
2856 flush_work(&dev
->cpu_work
);
2857 misc_deregister(&dev
->miscdev
);
2858 nvme_dev_remove(dev
);
2859 nvme_dev_shutdown(dev
);
2860 nvme_free_queues(dev
, 0);
2862 nvme_release_instance(dev
);
2863 nvme_release_prp_pools(dev
);
2864 kref_put(&dev
->kref
, nvme_free_dev
);
2867 /* These functions are yet to be implemented */
2868 #define nvme_error_detected NULL
2869 #define nvme_dump_registers NULL
2870 #define nvme_link_reset NULL
2871 #define nvme_slot_reset NULL
2872 #define nvme_error_resume NULL
2874 #ifdef CONFIG_PM_SLEEP
2875 static int nvme_suspend(struct device
*dev
)
2877 struct pci_dev
*pdev
= to_pci_dev(dev
);
2878 struct nvme_dev
*ndev
= pci_get_drvdata(pdev
);
2880 nvme_dev_shutdown(ndev
);
2884 static int nvme_resume(struct device
*dev
)
2886 struct pci_dev
*pdev
= to_pci_dev(dev
);
2887 struct nvme_dev
*ndev
= pci_get_drvdata(pdev
);
2889 if (nvme_dev_resume(ndev
) && !work_busy(&ndev
->reset_work
)) {
2890 ndev
->reset_workfn
= nvme_reset_failed_dev
;
2891 queue_work(nvme_workq
, &ndev
->reset_work
);
2897 static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops
, nvme_suspend
, nvme_resume
);
2899 static const struct pci_error_handlers nvme_err_handler
= {
2900 .error_detected
= nvme_error_detected
,
2901 .mmio_enabled
= nvme_dump_registers
,
2902 .link_reset
= nvme_link_reset
,
2903 .slot_reset
= nvme_slot_reset
,
2904 .resume
= nvme_error_resume
,
2905 .reset_notify
= nvme_reset_notify
,
2908 /* Move to pci_ids.h later */
2909 #define PCI_CLASS_STORAGE_EXPRESS 0x010802
2911 static const struct pci_device_id nvme_id_table
[] = {
2912 { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS
, 0xffffff) },
2915 MODULE_DEVICE_TABLE(pci
, nvme_id_table
);
2917 static struct pci_driver nvme_driver
= {
2919 .id_table
= nvme_id_table
,
2920 .probe
= nvme_probe
,
2921 .remove
= nvme_remove
,
2922 .shutdown
= nvme_shutdown
,
2924 .pm
= &nvme_dev_pm_ops
,
2926 .err_handler
= &nvme_err_handler
,
2929 static int __init
nvme_init(void)
2933 init_waitqueue_head(&nvme_kthread_wait
);
2935 nvme_workq
= create_singlethread_workqueue("nvme");
2939 result
= register_blkdev(nvme_major
, "nvme");
2942 else if (result
> 0)
2943 nvme_major
= result
;
2945 nvme_nb
.notifier_call
= &nvme_cpu_notify
;
2946 result
= register_hotcpu_notifier(&nvme_nb
);
2948 goto unregister_blkdev
;
2950 result
= pci_register_driver(&nvme_driver
);
2952 goto unregister_hotcpu
;
2956 unregister_hotcpu_notifier(&nvme_nb
);
2958 unregister_blkdev(nvme_major
, "nvme");
2960 destroy_workqueue(nvme_workq
);
2964 static void __exit
nvme_exit(void)
2966 pci_unregister_driver(&nvme_driver
);
2967 unregister_hotcpu_notifier(&nvme_nb
);
2968 unregister_blkdev(nvme_major
, "nvme");
2969 destroy_workqueue(nvme_workq
);
2970 BUG_ON(nvme_thread
&& !IS_ERR(nvme_thread
));
2974 MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>");
2975 MODULE_LICENSE("GPL");
2976 MODULE_VERSION("0.9");
2977 module_init(nvme_init
);
2978 module_exit(nvme_exit
);