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 io_timeout
= 30;
58 module_param(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
;
77 static void nvme_reset_failed_dev(struct work_struct
*ws
);
79 struct async_cmd_info
{
80 struct kthread_work work
;
81 struct kthread_worker
*worker
;
88 * An NVM Express queue. Each device has at least two (one for admin
89 * commands and one for I/O commands).
92 struct rcu_head r_head
;
93 struct device
*q_dmadev
;
95 char irqname
[24]; /* nvme4294967295-65535\0 */
97 struct nvme_command
*sq_cmds
;
98 volatile struct nvme_completion
*cqes
;
99 dma_addr_t sq_dma_addr
;
100 dma_addr_t cq_dma_addr
;
101 wait_queue_head_t sq_full
;
102 wait_queue_t sq_cong_wait
;
103 struct bio_list sq_cong
;
104 struct list_head iod_bio
;
115 cpumask_var_t cpu_mask
;
116 struct async_cmd_info cmdinfo
;
117 unsigned long cmdid_data
[];
121 * Check we didin't inadvertently grow the command struct
123 static inline void _nvme_check_size(void)
125 BUILD_BUG_ON(sizeof(struct nvme_rw_command
) != 64);
126 BUILD_BUG_ON(sizeof(struct nvme_create_cq
) != 64);
127 BUILD_BUG_ON(sizeof(struct nvme_create_sq
) != 64);
128 BUILD_BUG_ON(sizeof(struct nvme_delete_queue
) != 64);
129 BUILD_BUG_ON(sizeof(struct nvme_features
) != 64);
130 BUILD_BUG_ON(sizeof(struct nvme_format_cmd
) != 64);
131 BUILD_BUG_ON(sizeof(struct nvme_abort_cmd
) != 64);
132 BUILD_BUG_ON(sizeof(struct nvme_command
) != 64);
133 BUILD_BUG_ON(sizeof(struct nvme_id_ctrl
) != 4096);
134 BUILD_BUG_ON(sizeof(struct nvme_id_ns
) != 4096);
135 BUILD_BUG_ON(sizeof(struct nvme_lba_range_type
) != 64);
136 BUILD_BUG_ON(sizeof(struct nvme_smart_log
) != 512);
139 typedef void (*nvme_completion_fn
)(struct nvme_queue
*, void *,
140 struct nvme_completion
*);
142 struct nvme_cmd_info
{
143 nvme_completion_fn fn
;
145 unsigned long timeout
;
149 static struct nvme_cmd_info
*nvme_cmd_info(struct nvme_queue
*nvmeq
)
151 return (void *)&nvmeq
->cmdid_data
[BITS_TO_LONGS(nvmeq
->q_depth
)];
154 static unsigned nvme_queue_extra(int depth
)
156 return DIV_ROUND_UP(depth
, 8) + (depth
* sizeof(struct nvme_cmd_info
));
160 * alloc_cmdid() - Allocate a Command ID
161 * @nvmeq: The queue that will be used for this command
162 * @ctx: A pointer that will be passed to the handler
163 * @handler: The function to call on completion
165 * Allocate a Command ID for a queue. The data passed in will
166 * be passed to the completion handler. This is implemented by using
167 * the bottom two bits of the ctx pointer to store the handler ID.
168 * Passing in a pointer that's not 4-byte aligned will cause a BUG.
169 * We can change this if it becomes a problem.
171 * May be called with local interrupts disabled and the q_lock held,
172 * or with interrupts enabled and no locks held.
174 static int alloc_cmdid(struct nvme_queue
*nvmeq
, void *ctx
,
175 nvme_completion_fn handler
, unsigned timeout
)
177 int depth
= nvmeq
->q_depth
- 1;
178 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
182 cmdid
= find_first_zero_bit(nvmeq
->cmdid_data
, depth
);
185 } while (test_and_set_bit(cmdid
, nvmeq
->cmdid_data
));
187 info
[cmdid
].fn
= handler
;
188 info
[cmdid
].ctx
= ctx
;
189 info
[cmdid
].timeout
= jiffies
+ timeout
;
190 info
[cmdid
].aborted
= 0;
194 static int alloc_cmdid_killable(struct nvme_queue
*nvmeq
, void *ctx
,
195 nvme_completion_fn handler
, unsigned timeout
)
198 wait_event_killable(nvmeq
->sq_full
,
199 (cmdid
= alloc_cmdid(nvmeq
, ctx
, handler
, timeout
)) >= 0);
200 return (cmdid
< 0) ? -EINTR
: cmdid
;
203 /* Special values must be less than 0x1000 */
204 #define CMD_CTX_BASE ((void *)POISON_POINTER_DELTA)
205 #define CMD_CTX_CANCELLED (0x30C + CMD_CTX_BASE)
206 #define CMD_CTX_COMPLETED (0x310 + CMD_CTX_BASE)
207 #define CMD_CTX_INVALID (0x314 + CMD_CTX_BASE)
208 #define CMD_CTX_ABORT (0x318 + CMD_CTX_BASE)
210 static void special_completion(struct nvme_queue
*nvmeq
, void *ctx
,
211 struct nvme_completion
*cqe
)
213 if (ctx
== CMD_CTX_CANCELLED
)
215 if (ctx
== CMD_CTX_ABORT
) {
216 ++nvmeq
->dev
->abort_limit
;
219 if (ctx
== CMD_CTX_COMPLETED
) {
220 dev_warn(nvmeq
->q_dmadev
,
221 "completed id %d twice on queue %d\n",
222 cqe
->command_id
, le16_to_cpup(&cqe
->sq_id
));
225 if (ctx
== CMD_CTX_INVALID
) {
226 dev_warn(nvmeq
->q_dmadev
,
227 "invalid id %d completed on queue %d\n",
228 cqe
->command_id
, le16_to_cpup(&cqe
->sq_id
));
232 dev_warn(nvmeq
->q_dmadev
, "Unknown special completion %p\n", ctx
);
235 static void async_completion(struct nvme_queue
*nvmeq
, void *ctx
,
236 struct nvme_completion
*cqe
)
238 struct async_cmd_info
*cmdinfo
= ctx
;
239 cmdinfo
->result
= le32_to_cpup(&cqe
->result
);
240 cmdinfo
->status
= le16_to_cpup(&cqe
->status
) >> 1;
241 queue_kthread_work(cmdinfo
->worker
, &cmdinfo
->work
);
245 * Called with local interrupts disabled and the q_lock held. May not sleep.
247 static void *free_cmdid(struct nvme_queue
*nvmeq
, int cmdid
,
248 nvme_completion_fn
*fn
)
251 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
253 if (cmdid
>= nvmeq
->q_depth
|| !info
[cmdid
].fn
) {
255 *fn
= special_completion
;
256 return CMD_CTX_INVALID
;
259 *fn
= info
[cmdid
].fn
;
260 ctx
= info
[cmdid
].ctx
;
261 info
[cmdid
].fn
= special_completion
;
262 info
[cmdid
].ctx
= CMD_CTX_COMPLETED
;
263 clear_bit(cmdid
, nvmeq
->cmdid_data
);
264 wake_up(&nvmeq
->sq_full
);
268 static void *cancel_cmdid(struct nvme_queue
*nvmeq
, int cmdid
,
269 nvme_completion_fn
*fn
)
272 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
274 *fn
= info
[cmdid
].fn
;
275 ctx
= info
[cmdid
].ctx
;
276 info
[cmdid
].fn
= special_completion
;
277 info
[cmdid
].ctx
= CMD_CTX_CANCELLED
;
281 static struct nvme_queue
*raw_nvmeq(struct nvme_dev
*dev
, int qid
)
283 return rcu_dereference_raw(dev
->queues
[qid
]);
286 static struct nvme_queue
*get_nvmeq(struct nvme_dev
*dev
) __acquires(RCU
)
288 struct nvme_queue
*nvmeq
;
289 unsigned queue_id
= get_cpu_var(*dev
->io_queue
);
292 nvmeq
= rcu_dereference(dev
->queues
[queue_id
]);
297 put_cpu_var(*dev
->io_queue
);
301 static void put_nvmeq(struct nvme_queue
*nvmeq
) __releases(RCU
)
304 put_cpu_var(nvmeq
->dev
->io_queue
);
307 static struct nvme_queue
*lock_nvmeq(struct nvme_dev
*dev
, int q_idx
)
310 struct nvme_queue
*nvmeq
;
313 nvmeq
= rcu_dereference(dev
->queues
[q_idx
]);
321 static void unlock_nvmeq(struct nvme_queue
*nvmeq
) __releases(RCU
)
327 * nvme_submit_cmd() - Copy a command into a queue and ring the doorbell
328 * @nvmeq: The queue to use
329 * @cmd: The command to send
331 * Safe to use from interrupt context
333 static int nvme_submit_cmd(struct nvme_queue
*nvmeq
, struct nvme_command
*cmd
)
337 spin_lock_irqsave(&nvmeq
->q_lock
, flags
);
338 if (nvmeq
->q_suspended
) {
339 spin_unlock_irqrestore(&nvmeq
->q_lock
, flags
);
342 tail
= nvmeq
->sq_tail
;
343 memcpy(&nvmeq
->sq_cmds
[tail
], cmd
, sizeof(*cmd
));
344 if (++tail
== nvmeq
->q_depth
)
346 writel(tail
, nvmeq
->q_db
);
347 nvmeq
->sq_tail
= tail
;
348 spin_unlock_irqrestore(&nvmeq
->q_lock
, flags
);
353 static __le64
**iod_list(struct nvme_iod
*iod
)
355 return ((void *)iod
) + iod
->offset
;
359 * Will slightly overestimate the number of pages needed. This is OK
360 * as it only leads to a small amount of wasted memory for the lifetime of
363 static int nvme_npages(unsigned size
)
365 unsigned nprps
= DIV_ROUND_UP(size
+ PAGE_SIZE
, PAGE_SIZE
);
366 return DIV_ROUND_UP(8 * nprps
, PAGE_SIZE
- 8);
369 static struct nvme_iod
*
370 nvme_alloc_iod(unsigned nseg
, unsigned nbytes
, gfp_t gfp
)
372 struct nvme_iod
*iod
= kmalloc(sizeof(struct nvme_iod
) +
373 sizeof(__le64
*) * nvme_npages(nbytes
) +
374 sizeof(struct scatterlist
) * nseg
, gfp
);
377 iod
->offset
= offsetof(struct nvme_iod
, sg
[nseg
]);
379 iod
->length
= nbytes
;
381 iod
->first_dma
= 0ULL;
382 iod
->start_time
= jiffies
;
388 void nvme_free_iod(struct nvme_dev
*dev
, struct nvme_iod
*iod
)
390 const int last_prp
= PAGE_SIZE
/ 8 - 1;
392 __le64
**list
= iod_list(iod
);
393 dma_addr_t prp_dma
= iod
->first_dma
;
395 if (iod
->npages
== 0)
396 dma_pool_free(dev
->prp_small_pool
, list
[0], prp_dma
);
397 for (i
= 0; i
< iod
->npages
; i
++) {
398 __le64
*prp_list
= list
[i
];
399 dma_addr_t next_prp_dma
= le64_to_cpu(prp_list
[last_prp
]);
400 dma_pool_free(dev
->prp_page_pool
, prp_list
, prp_dma
);
401 prp_dma
= next_prp_dma
;
406 static void nvme_start_io_acct(struct bio
*bio
)
408 struct gendisk
*disk
= bio
->bi_bdev
->bd_disk
;
409 const int rw
= bio_data_dir(bio
);
410 int cpu
= part_stat_lock();
411 part_round_stats(cpu
, &disk
->part0
);
412 part_stat_inc(cpu
, &disk
->part0
, ios
[rw
]);
413 part_stat_add(cpu
, &disk
->part0
, sectors
[rw
], bio_sectors(bio
));
414 part_inc_in_flight(&disk
->part0
, rw
);
418 static void nvme_end_io_acct(struct bio
*bio
, unsigned long start_time
)
420 struct gendisk
*disk
= bio
->bi_bdev
->bd_disk
;
421 const int rw
= bio_data_dir(bio
);
422 unsigned long duration
= jiffies
- start_time
;
423 int cpu
= part_stat_lock();
424 part_stat_add(cpu
, &disk
->part0
, ticks
[rw
], duration
);
425 part_round_stats(cpu
, &disk
->part0
);
426 part_dec_in_flight(&disk
->part0
, rw
);
430 static void bio_completion(struct nvme_queue
*nvmeq
, void *ctx
,
431 struct nvme_completion
*cqe
)
433 struct nvme_iod
*iod
= ctx
;
434 struct bio
*bio
= iod
->private;
435 u16 status
= le16_to_cpup(&cqe
->status
) >> 1;
438 if (unlikely(status
)) {
439 if (!(status
& NVME_SC_DNR
||
440 bio
->bi_rw
& REQ_FAILFAST_MASK
) &&
441 (jiffies
- iod
->start_time
) < IOD_TIMEOUT
) {
442 if (!waitqueue_active(&nvmeq
->sq_full
))
443 add_wait_queue(&nvmeq
->sq_full
,
444 &nvmeq
->sq_cong_wait
);
445 list_add_tail(&iod
->node
, &nvmeq
->iod_bio
);
446 wake_up(&nvmeq
->sq_full
);
452 dma_unmap_sg(nvmeq
->q_dmadev
, iod
->sg
, iod
->nents
,
453 bio_data_dir(bio
) ? DMA_TO_DEVICE
: DMA_FROM_DEVICE
);
454 nvme_end_io_acct(bio
, iod
->start_time
);
456 nvme_free_iod(nvmeq
->dev
, iod
);
458 trace_block_bio_complete(bdev_get_queue(bio
->bi_bdev
), bio
, error
);
459 bio_endio(bio
, error
);
462 /* length is in bytes. gfp flags indicates whether we may sleep. */
463 int nvme_setup_prps(struct nvme_dev
*dev
, struct nvme_iod
*iod
, int total_len
,
466 struct dma_pool
*pool
;
467 int length
= total_len
;
468 struct scatterlist
*sg
= iod
->sg
;
469 int dma_len
= sg_dma_len(sg
);
470 u64 dma_addr
= sg_dma_address(sg
);
471 int offset
= offset_in_page(dma_addr
);
473 __le64
**list
= iod_list(iod
);
477 length
-= (PAGE_SIZE
- offset
);
481 dma_len
-= (PAGE_SIZE
- offset
);
483 dma_addr
+= (PAGE_SIZE
- offset
);
486 dma_addr
= sg_dma_address(sg
);
487 dma_len
= sg_dma_len(sg
);
490 if (length
<= PAGE_SIZE
) {
491 iod
->first_dma
= dma_addr
;
495 nprps
= DIV_ROUND_UP(length
, PAGE_SIZE
);
496 if (nprps
<= (256 / 8)) {
497 pool
= dev
->prp_small_pool
;
500 pool
= dev
->prp_page_pool
;
504 prp_list
= dma_pool_alloc(pool
, gfp
, &prp_dma
);
506 iod
->first_dma
= dma_addr
;
508 return (total_len
- length
) + PAGE_SIZE
;
511 iod
->first_dma
= prp_dma
;
514 if (i
== PAGE_SIZE
/ 8) {
515 __le64
*old_prp_list
= prp_list
;
516 prp_list
= dma_pool_alloc(pool
, gfp
, &prp_dma
);
518 return total_len
- length
;
519 list
[iod
->npages
++] = prp_list
;
520 prp_list
[0] = old_prp_list
[i
- 1];
521 old_prp_list
[i
- 1] = cpu_to_le64(prp_dma
);
524 prp_list
[i
++] = cpu_to_le64(dma_addr
);
525 dma_len
-= PAGE_SIZE
;
526 dma_addr
+= PAGE_SIZE
;
534 dma_addr
= sg_dma_address(sg
);
535 dma_len
= sg_dma_len(sg
);
541 static int nvme_split_and_submit(struct bio
*bio
, struct nvme_queue
*nvmeq
,
544 struct bio
*split
= bio_split(bio
, len
>> 9, GFP_ATOMIC
, NULL
);
548 trace_block_split(bdev_get_queue(bio
->bi_bdev
), bio
,
549 split
->bi_iter
.bi_sector
);
550 bio_chain(split
, bio
);
552 if (!waitqueue_active(&nvmeq
->sq_full
))
553 add_wait_queue(&nvmeq
->sq_full
, &nvmeq
->sq_cong_wait
);
554 bio_list_add(&nvmeq
->sq_cong
, split
);
555 bio_list_add(&nvmeq
->sq_cong
, bio
);
556 wake_up(&nvmeq
->sq_full
);
561 /* NVMe scatterlists require no holes in the virtual address */
562 #define BIOVEC_NOT_VIRT_MERGEABLE(vec1, vec2) ((vec2)->bv_offset || \
563 (((vec1)->bv_offset + (vec1)->bv_len) % PAGE_SIZE))
565 static int nvme_map_bio(struct nvme_queue
*nvmeq
, struct nvme_iod
*iod
,
566 struct bio
*bio
, enum dma_data_direction dma_dir
, int psegs
)
568 struct bio_vec bvec
, bvprv
;
569 struct bvec_iter iter
;
570 struct scatterlist
*sg
= NULL
;
571 int length
= 0, nsegs
= 0, split_len
= bio
->bi_iter
.bi_size
;
574 if (nvmeq
->dev
->stripe_size
)
575 split_len
= nvmeq
->dev
->stripe_size
-
576 ((bio
->bi_iter
.bi_sector
<< 9) &
577 (nvmeq
->dev
->stripe_size
- 1));
579 sg_init_table(iod
->sg
, psegs
);
580 bio_for_each_segment(bvec
, bio
, iter
) {
581 if (!first
&& BIOVEC_PHYS_MERGEABLE(&bvprv
, &bvec
)) {
582 sg
->length
+= bvec
.bv_len
;
584 if (!first
&& BIOVEC_NOT_VIRT_MERGEABLE(&bvprv
, &bvec
))
585 return nvme_split_and_submit(bio
, nvmeq
,
588 sg
= sg
? sg
+ 1 : iod
->sg
;
589 sg_set_page(sg
, bvec
.bv_page
,
590 bvec
.bv_len
, bvec
.bv_offset
);
594 if (split_len
- length
< bvec
.bv_len
)
595 return nvme_split_and_submit(bio
, nvmeq
, split_len
);
596 length
+= bvec
.bv_len
;
602 if (dma_map_sg(nvmeq
->q_dmadev
, iod
->sg
, iod
->nents
, dma_dir
) == 0)
605 BUG_ON(length
!= bio
->bi_iter
.bi_size
);
609 static int nvme_submit_discard(struct nvme_queue
*nvmeq
, struct nvme_ns
*ns
,
610 struct bio
*bio
, struct nvme_iod
*iod
, int cmdid
)
612 struct nvme_dsm_range
*range
=
613 (struct nvme_dsm_range
*)iod_list(iod
)[0];
614 struct nvme_command
*cmnd
= &nvmeq
->sq_cmds
[nvmeq
->sq_tail
];
616 range
->cattr
= cpu_to_le32(0);
617 range
->nlb
= cpu_to_le32(bio
->bi_iter
.bi_size
>> ns
->lba_shift
);
618 range
->slba
= cpu_to_le64(nvme_block_nr(ns
, bio
->bi_iter
.bi_sector
));
620 memset(cmnd
, 0, sizeof(*cmnd
));
621 cmnd
->dsm
.opcode
= nvme_cmd_dsm
;
622 cmnd
->dsm
.command_id
= cmdid
;
623 cmnd
->dsm
.nsid
= cpu_to_le32(ns
->ns_id
);
624 cmnd
->dsm
.prp1
= cpu_to_le64(iod
->first_dma
);
626 cmnd
->dsm
.attributes
= cpu_to_le32(NVME_DSMGMT_AD
);
628 if (++nvmeq
->sq_tail
== nvmeq
->q_depth
)
630 writel(nvmeq
->sq_tail
, nvmeq
->q_db
);
635 static int nvme_submit_flush(struct nvme_queue
*nvmeq
, struct nvme_ns
*ns
,
638 struct nvme_command
*cmnd
= &nvmeq
->sq_cmds
[nvmeq
->sq_tail
];
640 memset(cmnd
, 0, sizeof(*cmnd
));
641 cmnd
->common
.opcode
= nvme_cmd_flush
;
642 cmnd
->common
.command_id
= cmdid
;
643 cmnd
->common
.nsid
= cpu_to_le32(ns
->ns_id
);
645 if (++nvmeq
->sq_tail
== nvmeq
->q_depth
)
647 writel(nvmeq
->sq_tail
, nvmeq
->q_db
);
652 static int nvme_submit_iod(struct nvme_queue
*nvmeq
, struct nvme_iod
*iod
)
654 struct bio
*bio
= iod
->private;
655 struct nvme_ns
*ns
= bio
->bi_bdev
->bd_disk
->private_data
;
656 struct nvme_command
*cmnd
;
661 cmdid
= alloc_cmdid(nvmeq
, iod
, bio_completion
, NVME_IO_TIMEOUT
);
662 if (unlikely(cmdid
< 0))
665 if (bio
->bi_rw
& REQ_DISCARD
)
666 return nvme_submit_discard(nvmeq
, ns
, bio
, iod
, cmdid
);
667 if (bio
->bi_rw
& REQ_FLUSH
)
668 return nvme_submit_flush(nvmeq
, ns
, cmdid
);
671 if (bio
->bi_rw
& REQ_FUA
)
672 control
|= NVME_RW_FUA
;
673 if (bio
->bi_rw
& (REQ_FAILFAST_DEV
| REQ_RAHEAD
))
674 control
|= NVME_RW_LR
;
677 if (bio
->bi_rw
& REQ_RAHEAD
)
678 dsmgmt
|= NVME_RW_DSM_FREQ_PREFETCH
;
680 cmnd
= &nvmeq
->sq_cmds
[nvmeq
->sq_tail
];
681 memset(cmnd
, 0, sizeof(*cmnd
));
683 cmnd
->rw
.opcode
= bio_data_dir(bio
) ? nvme_cmd_write
: nvme_cmd_read
;
684 cmnd
->rw
.command_id
= cmdid
;
685 cmnd
->rw
.nsid
= cpu_to_le32(ns
->ns_id
);
686 cmnd
->rw
.prp1
= cpu_to_le64(sg_dma_address(iod
->sg
));
687 cmnd
->rw
.prp2
= cpu_to_le64(iod
->first_dma
);
688 cmnd
->rw
.slba
= cpu_to_le64(nvme_block_nr(ns
, bio
->bi_iter
.bi_sector
));
690 cpu_to_le16((bio
->bi_iter
.bi_size
>> ns
->lba_shift
) - 1);
691 cmnd
->rw
.control
= cpu_to_le16(control
);
692 cmnd
->rw
.dsmgmt
= cpu_to_le32(dsmgmt
);
694 if (++nvmeq
->sq_tail
== nvmeq
->q_depth
)
696 writel(nvmeq
->sq_tail
, nvmeq
->q_db
);
701 static int nvme_split_flush_data(struct nvme_queue
*nvmeq
, struct bio
*bio
)
703 struct bio
*split
= bio_clone(bio
, GFP_ATOMIC
);
707 split
->bi_iter
.bi_size
= 0;
708 split
->bi_phys_segments
= 0;
709 bio
->bi_rw
&= ~REQ_FLUSH
;
710 bio_chain(split
, bio
);
712 if (!waitqueue_active(&nvmeq
->sq_full
))
713 add_wait_queue(&nvmeq
->sq_full
, &nvmeq
->sq_cong_wait
);
714 bio_list_add(&nvmeq
->sq_cong
, split
);
715 bio_list_add(&nvmeq
->sq_cong
, bio
);
716 wake_up_process(nvme_thread
);
722 * Called with local interrupts disabled and the q_lock held. May not sleep.
724 static int nvme_submit_bio_queue(struct nvme_queue
*nvmeq
, struct nvme_ns
*ns
,
727 struct nvme_iod
*iod
;
728 int psegs
= bio_phys_segments(ns
->queue
, bio
);
731 if ((bio
->bi_rw
& REQ_FLUSH
) && psegs
)
732 return nvme_split_flush_data(nvmeq
, bio
);
734 iod
= nvme_alloc_iod(psegs
, bio
->bi_iter
.bi_size
, GFP_ATOMIC
);
739 if (bio
->bi_rw
& REQ_DISCARD
) {
742 * We reuse the small pool to allocate the 16-byte range here
743 * as it is not worth having a special pool for these or
744 * additional cases to handle freeing the iod.
746 range
= dma_pool_alloc(nvmeq
->dev
->prp_small_pool
,
753 iod_list(iod
)[0] = (__le64
*)range
;
756 result
= nvme_map_bio(nvmeq
, iod
, bio
,
757 bio_data_dir(bio
) ? DMA_TO_DEVICE
: DMA_FROM_DEVICE
,
761 if (nvme_setup_prps(nvmeq
->dev
, iod
, result
, GFP_ATOMIC
) !=
766 nvme_start_io_acct(bio
);
768 if (unlikely(nvme_submit_iod(nvmeq
, iod
))) {
769 if (!waitqueue_active(&nvmeq
->sq_full
))
770 add_wait_queue(&nvmeq
->sq_full
, &nvmeq
->sq_cong_wait
);
771 list_add_tail(&iod
->node
, &nvmeq
->iod_bio
);
776 nvme_free_iod(nvmeq
->dev
, iod
);
780 static int nvme_process_cq(struct nvme_queue
*nvmeq
)
784 head
= nvmeq
->cq_head
;
785 phase
= nvmeq
->cq_phase
;
789 nvme_completion_fn fn
;
790 struct nvme_completion cqe
= nvmeq
->cqes
[head
];
791 if ((le16_to_cpu(cqe
.status
) & 1) != phase
)
793 nvmeq
->sq_head
= le16_to_cpu(cqe
.sq_head
);
794 if (++head
== nvmeq
->q_depth
) {
799 ctx
= free_cmdid(nvmeq
, cqe
.command_id
, &fn
);
800 fn(nvmeq
, ctx
, &cqe
);
803 /* If the controller ignores the cq head doorbell and continuously
804 * writes to the queue, it is theoretically possible to wrap around
805 * the queue twice and mistakenly return IRQ_NONE. Linux only
806 * requires that 0.1% of your interrupts are handled, so this isn't
809 if (head
== nvmeq
->cq_head
&& phase
== nvmeq
->cq_phase
)
812 writel(head
, nvmeq
->q_db
+ nvmeq
->dev
->db_stride
);
813 nvmeq
->cq_head
= head
;
814 nvmeq
->cq_phase
= phase
;
820 static void nvme_make_request(struct request_queue
*q
, struct bio
*bio
)
822 struct nvme_ns
*ns
= q
->queuedata
;
823 struct nvme_queue
*nvmeq
= get_nvmeq(ns
->dev
);
827 bio_endio(bio
, -EIO
);
831 spin_lock_irq(&nvmeq
->q_lock
);
832 if (!nvmeq
->q_suspended
&& bio_list_empty(&nvmeq
->sq_cong
))
833 result
= nvme_submit_bio_queue(nvmeq
, ns
, bio
);
834 if (unlikely(result
)) {
835 if (!waitqueue_active(&nvmeq
->sq_full
))
836 add_wait_queue(&nvmeq
->sq_full
, &nvmeq
->sq_cong_wait
);
837 bio_list_add(&nvmeq
->sq_cong
, bio
);
840 nvme_process_cq(nvmeq
);
841 spin_unlock_irq(&nvmeq
->q_lock
);
845 static irqreturn_t
nvme_irq(int irq
, void *data
)
848 struct nvme_queue
*nvmeq
= data
;
849 spin_lock(&nvmeq
->q_lock
);
850 nvme_process_cq(nvmeq
);
851 result
= nvmeq
->cqe_seen
? IRQ_HANDLED
: IRQ_NONE
;
853 spin_unlock(&nvmeq
->q_lock
);
857 static irqreturn_t
nvme_irq_check(int irq
, void *data
)
859 struct nvme_queue
*nvmeq
= data
;
860 struct nvme_completion cqe
= nvmeq
->cqes
[nvmeq
->cq_head
];
861 if ((le16_to_cpu(cqe
.status
) & 1) != nvmeq
->cq_phase
)
863 return IRQ_WAKE_THREAD
;
866 static void nvme_abort_command(struct nvme_queue
*nvmeq
, int cmdid
)
868 spin_lock_irq(&nvmeq
->q_lock
);
869 cancel_cmdid(nvmeq
, cmdid
, NULL
);
870 spin_unlock_irq(&nvmeq
->q_lock
);
873 struct sync_cmd_info
{
874 struct task_struct
*task
;
879 static void sync_completion(struct nvme_queue
*nvmeq
, void *ctx
,
880 struct nvme_completion
*cqe
)
882 struct sync_cmd_info
*cmdinfo
= ctx
;
883 cmdinfo
->result
= le32_to_cpup(&cqe
->result
);
884 cmdinfo
->status
= le16_to_cpup(&cqe
->status
) >> 1;
885 wake_up_process(cmdinfo
->task
);
889 * Returns 0 on success. If the result is negative, it's a Linux error code;
890 * if the result is positive, it's an NVM Express status code
892 static int nvme_submit_sync_cmd(struct nvme_dev
*dev
, int q_idx
,
893 struct nvme_command
*cmd
,
894 u32
*result
, unsigned timeout
)
897 struct sync_cmd_info cmdinfo
;
898 struct nvme_queue
*nvmeq
;
900 nvmeq
= lock_nvmeq(dev
, q_idx
);
904 cmdinfo
.task
= current
;
905 cmdinfo
.status
= -EINTR
;
907 cmdid
= alloc_cmdid(nvmeq
, &cmdinfo
, sync_completion
, timeout
);
912 cmd
->common
.command_id
= cmdid
;
914 set_current_state(TASK_KILLABLE
);
915 ret
= nvme_submit_cmd(nvmeq
, cmd
);
917 free_cmdid(nvmeq
, cmdid
, NULL
);
919 set_current_state(TASK_RUNNING
);
923 schedule_timeout(timeout
);
925 if (cmdinfo
.status
== -EINTR
) {
926 nvmeq
= lock_nvmeq(dev
, q_idx
);
928 nvme_abort_command(nvmeq
, cmdid
);
935 *result
= cmdinfo
.result
;
937 return cmdinfo
.status
;
940 static int nvme_submit_async_cmd(struct nvme_queue
*nvmeq
,
941 struct nvme_command
*cmd
,
942 struct async_cmd_info
*cmdinfo
, unsigned timeout
)
946 cmdid
= alloc_cmdid_killable(nvmeq
, cmdinfo
, async_completion
, timeout
);
949 cmdinfo
->status
= -EINTR
;
950 cmd
->common
.command_id
= cmdid
;
951 return nvme_submit_cmd(nvmeq
, cmd
);
954 int nvme_submit_admin_cmd(struct nvme_dev
*dev
, struct nvme_command
*cmd
,
957 return nvme_submit_sync_cmd(dev
, 0, cmd
, result
, ADMIN_TIMEOUT
);
960 int nvme_submit_io_cmd(struct nvme_dev
*dev
, struct nvme_command
*cmd
,
963 return nvme_submit_sync_cmd(dev
, smp_processor_id() + 1, cmd
, result
,
967 static int nvme_submit_admin_cmd_async(struct nvme_dev
*dev
,
968 struct nvme_command
*cmd
, struct async_cmd_info
*cmdinfo
)
970 return nvme_submit_async_cmd(raw_nvmeq(dev
, 0), cmd
, cmdinfo
,
974 static int adapter_delete_queue(struct nvme_dev
*dev
, u8 opcode
, u16 id
)
977 struct nvme_command c
;
979 memset(&c
, 0, sizeof(c
));
980 c
.delete_queue
.opcode
= opcode
;
981 c
.delete_queue
.qid
= cpu_to_le16(id
);
983 status
= nvme_submit_admin_cmd(dev
, &c
, NULL
);
989 static int adapter_alloc_cq(struct nvme_dev
*dev
, u16 qid
,
990 struct nvme_queue
*nvmeq
)
993 struct nvme_command c
;
994 int flags
= NVME_QUEUE_PHYS_CONTIG
| NVME_CQ_IRQ_ENABLED
;
996 memset(&c
, 0, sizeof(c
));
997 c
.create_cq
.opcode
= nvme_admin_create_cq
;
998 c
.create_cq
.prp1
= cpu_to_le64(nvmeq
->cq_dma_addr
);
999 c
.create_cq
.cqid
= cpu_to_le16(qid
);
1000 c
.create_cq
.qsize
= cpu_to_le16(nvmeq
->q_depth
- 1);
1001 c
.create_cq
.cq_flags
= cpu_to_le16(flags
);
1002 c
.create_cq
.irq_vector
= cpu_to_le16(nvmeq
->cq_vector
);
1004 status
= nvme_submit_admin_cmd(dev
, &c
, NULL
);
1010 static int adapter_alloc_sq(struct nvme_dev
*dev
, u16 qid
,
1011 struct nvme_queue
*nvmeq
)
1014 struct nvme_command c
;
1015 int flags
= NVME_QUEUE_PHYS_CONTIG
| NVME_SQ_PRIO_MEDIUM
;
1017 memset(&c
, 0, sizeof(c
));
1018 c
.create_sq
.opcode
= nvme_admin_create_sq
;
1019 c
.create_sq
.prp1
= cpu_to_le64(nvmeq
->sq_dma_addr
);
1020 c
.create_sq
.sqid
= cpu_to_le16(qid
);
1021 c
.create_sq
.qsize
= cpu_to_le16(nvmeq
->q_depth
- 1);
1022 c
.create_sq
.sq_flags
= cpu_to_le16(flags
);
1023 c
.create_sq
.cqid
= cpu_to_le16(qid
);
1025 status
= nvme_submit_admin_cmd(dev
, &c
, NULL
);
1031 static int adapter_delete_cq(struct nvme_dev
*dev
, u16 cqid
)
1033 return adapter_delete_queue(dev
, nvme_admin_delete_cq
, cqid
);
1036 static int adapter_delete_sq(struct nvme_dev
*dev
, u16 sqid
)
1038 return adapter_delete_queue(dev
, nvme_admin_delete_sq
, sqid
);
1041 int nvme_identify(struct nvme_dev
*dev
, unsigned nsid
, unsigned cns
,
1042 dma_addr_t dma_addr
)
1044 struct nvme_command c
;
1046 memset(&c
, 0, sizeof(c
));
1047 c
.identify
.opcode
= nvme_admin_identify
;
1048 c
.identify
.nsid
= cpu_to_le32(nsid
);
1049 c
.identify
.prp1
= cpu_to_le64(dma_addr
);
1050 c
.identify
.cns
= cpu_to_le32(cns
);
1052 return nvme_submit_admin_cmd(dev
, &c
, NULL
);
1055 int nvme_get_features(struct nvme_dev
*dev
, unsigned fid
, unsigned nsid
,
1056 dma_addr_t dma_addr
, u32
*result
)
1058 struct nvme_command c
;
1060 memset(&c
, 0, sizeof(c
));
1061 c
.features
.opcode
= nvme_admin_get_features
;
1062 c
.features
.nsid
= cpu_to_le32(nsid
);
1063 c
.features
.prp1
= cpu_to_le64(dma_addr
);
1064 c
.features
.fid
= cpu_to_le32(fid
);
1066 return nvme_submit_admin_cmd(dev
, &c
, result
);
1069 int nvme_set_features(struct nvme_dev
*dev
, unsigned fid
, unsigned dword11
,
1070 dma_addr_t dma_addr
, u32
*result
)
1072 struct nvme_command c
;
1074 memset(&c
, 0, sizeof(c
));
1075 c
.features
.opcode
= nvme_admin_set_features
;
1076 c
.features
.prp1
= cpu_to_le64(dma_addr
);
1077 c
.features
.fid
= cpu_to_le32(fid
);
1078 c
.features
.dword11
= cpu_to_le32(dword11
);
1080 return nvme_submit_admin_cmd(dev
, &c
, result
);
1084 * nvme_abort_cmd - Attempt aborting a command
1085 * @cmdid: Command id of a timed out IO
1086 * @queue: The queue with timed out IO
1088 * Schedule controller reset if the command was already aborted once before and
1089 * still hasn't been returned to the driver, or if this is the admin queue.
1091 static void nvme_abort_cmd(int cmdid
, struct nvme_queue
*nvmeq
)
1094 struct nvme_command cmd
;
1095 struct nvme_dev
*dev
= nvmeq
->dev
;
1096 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
1097 struct nvme_queue
*adminq
;
1099 if (!nvmeq
->qid
|| info
[cmdid
].aborted
) {
1100 if (work_busy(&dev
->reset_work
))
1102 list_del_init(&dev
->node
);
1103 dev_warn(&dev
->pci_dev
->dev
,
1104 "I/O %d QID %d timeout, reset controller\n", cmdid
,
1106 dev
->reset_workfn
= nvme_reset_failed_dev
;
1107 queue_work(nvme_workq
, &dev
->reset_work
);
1111 if (!dev
->abort_limit
)
1114 adminq
= rcu_dereference(dev
->queues
[0]);
1115 a_cmdid
= alloc_cmdid(adminq
, CMD_CTX_ABORT
, special_completion
,
1120 memset(&cmd
, 0, sizeof(cmd
));
1121 cmd
.abort
.opcode
= nvme_admin_abort_cmd
;
1122 cmd
.abort
.cid
= cmdid
;
1123 cmd
.abort
.sqid
= cpu_to_le16(nvmeq
->qid
);
1124 cmd
.abort
.command_id
= a_cmdid
;
1127 info
[cmdid
].aborted
= 1;
1128 info
[cmdid
].timeout
= jiffies
+ ADMIN_TIMEOUT
;
1130 dev_warn(nvmeq
->q_dmadev
, "Aborting I/O %d QID %d\n", cmdid
,
1132 nvme_submit_cmd(adminq
, &cmd
);
1136 * nvme_cancel_ios - Cancel outstanding I/Os
1137 * @queue: The queue to cancel I/Os on
1138 * @timeout: True to only cancel I/Os which have timed out
1140 static void nvme_cancel_ios(struct nvme_queue
*nvmeq
, bool timeout
)
1142 int depth
= nvmeq
->q_depth
- 1;
1143 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
1144 unsigned long now
= jiffies
;
1147 for_each_set_bit(cmdid
, nvmeq
->cmdid_data
, depth
) {
1149 nvme_completion_fn fn
;
1150 static struct nvme_completion cqe
= {
1151 .status
= cpu_to_le16(NVME_SC_ABORT_REQ
<< 1),
1154 if (timeout
&& !time_after(now
, info
[cmdid
].timeout
))
1156 if (info
[cmdid
].ctx
== CMD_CTX_CANCELLED
)
1158 if (timeout
&& nvmeq
->dev
->initialized
) {
1159 nvme_abort_cmd(cmdid
, nvmeq
);
1162 dev_warn(nvmeq
->q_dmadev
, "Cancelling I/O %d QID %d\n", cmdid
,
1164 ctx
= cancel_cmdid(nvmeq
, cmdid
, &fn
);
1165 fn(nvmeq
, ctx
, &cqe
);
1169 static void nvme_free_queue(struct rcu_head
*r
)
1171 struct nvme_queue
*nvmeq
= container_of(r
, struct nvme_queue
, r_head
);
1173 spin_lock_irq(&nvmeq
->q_lock
);
1174 while (bio_list_peek(&nvmeq
->sq_cong
)) {
1175 struct bio
*bio
= bio_list_pop(&nvmeq
->sq_cong
);
1176 bio_endio(bio
, -EIO
);
1178 while (!list_empty(&nvmeq
->iod_bio
)) {
1179 static struct nvme_completion cqe
= {
1180 .status
= cpu_to_le16(
1181 (NVME_SC_ABORT_REQ
| NVME_SC_DNR
) << 1),
1183 struct nvme_iod
*iod
= list_first_entry(&nvmeq
->iod_bio
,
1186 list_del(&iod
->node
);
1187 bio_completion(nvmeq
, iod
, &cqe
);
1189 spin_unlock_irq(&nvmeq
->q_lock
);
1191 dma_free_coherent(nvmeq
->q_dmadev
, CQ_SIZE(nvmeq
->q_depth
),
1192 (void *)nvmeq
->cqes
, nvmeq
->cq_dma_addr
);
1193 dma_free_coherent(nvmeq
->q_dmadev
, SQ_SIZE(nvmeq
->q_depth
),
1194 nvmeq
->sq_cmds
, nvmeq
->sq_dma_addr
);
1196 free_cpumask_var(nvmeq
->cpu_mask
);
1200 static void nvme_free_queues(struct nvme_dev
*dev
, int lowest
)
1204 for (i
= dev
->queue_count
- 1; i
>= lowest
; i
--) {
1205 struct nvme_queue
*nvmeq
= raw_nvmeq(dev
, i
);
1206 rcu_assign_pointer(dev
->queues
[i
], NULL
);
1207 call_rcu(&nvmeq
->r_head
, nvme_free_queue
);
1213 * nvme_suspend_queue - put queue into suspended state
1214 * @nvmeq - queue to suspend
1216 * Returns 1 if already suspended, 0 otherwise.
1218 static int nvme_suspend_queue(struct nvme_queue
*nvmeq
)
1220 int vector
= nvmeq
->dev
->entry
[nvmeq
->cq_vector
].vector
;
1222 spin_lock_irq(&nvmeq
->q_lock
);
1223 if (nvmeq
->q_suspended
) {
1224 spin_unlock_irq(&nvmeq
->q_lock
);
1227 nvmeq
->q_suspended
= 1;
1228 nvmeq
->dev
->online_queues
--;
1229 spin_unlock_irq(&nvmeq
->q_lock
);
1231 irq_set_affinity_hint(vector
, NULL
);
1232 free_irq(vector
, nvmeq
);
1237 static void nvme_clear_queue(struct nvme_queue
*nvmeq
)
1239 spin_lock_irq(&nvmeq
->q_lock
);
1240 nvme_process_cq(nvmeq
);
1241 nvme_cancel_ios(nvmeq
, false);
1242 spin_unlock_irq(&nvmeq
->q_lock
);
1245 static void nvme_disable_queue(struct nvme_dev
*dev
, int qid
)
1247 struct nvme_queue
*nvmeq
= raw_nvmeq(dev
, qid
);
1251 if (nvme_suspend_queue(nvmeq
))
1254 /* Don't tell the adapter to delete the admin queue.
1255 * Don't tell a removed adapter to delete IO queues. */
1256 if (qid
&& readl(&dev
->bar
->csts
) != -1) {
1257 adapter_delete_sq(dev
, qid
);
1258 adapter_delete_cq(dev
, qid
);
1260 nvme_clear_queue(nvmeq
);
1263 static struct nvme_queue
*nvme_alloc_queue(struct nvme_dev
*dev
, int qid
,
1264 int depth
, int vector
)
1266 struct device
*dmadev
= &dev
->pci_dev
->dev
;
1267 unsigned extra
= nvme_queue_extra(depth
);
1268 struct nvme_queue
*nvmeq
= kzalloc(sizeof(*nvmeq
) + extra
, GFP_KERNEL
);
1272 nvmeq
->cqes
= dma_alloc_coherent(dmadev
, CQ_SIZE(depth
),
1273 &nvmeq
->cq_dma_addr
, GFP_KERNEL
);
1276 memset((void *)nvmeq
->cqes
, 0, CQ_SIZE(depth
));
1278 nvmeq
->sq_cmds
= dma_alloc_coherent(dmadev
, SQ_SIZE(depth
),
1279 &nvmeq
->sq_dma_addr
, GFP_KERNEL
);
1280 if (!nvmeq
->sq_cmds
)
1283 if (qid
&& !zalloc_cpumask_var(&nvmeq
->cpu_mask
, GFP_KERNEL
))
1286 nvmeq
->q_dmadev
= dmadev
;
1288 snprintf(nvmeq
->irqname
, sizeof(nvmeq
->irqname
), "nvme%dq%d",
1289 dev
->instance
, qid
);
1290 spin_lock_init(&nvmeq
->q_lock
);
1292 nvmeq
->cq_phase
= 1;
1293 init_waitqueue_head(&nvmeq
->sq_full
);
1294 init_waitqueue_entry(&nvmeq
->sq_cong_wait
, nvme_thread
);
1295 bio_list_init(&nvmeq
->sq_cong
);
1296 INIT_LIST_HEAD(&nvmeq
->iod_bio
);
1297 nvmeq
->q_db
= &dev
->dbs
[qid
* 2 * dev
->db_stride
];
1298 nvmeq
->q_depth
= depth
;
1299 nvmeq
->cq_vector
= vector
;
1301 nvmeq
->q_suspended
= 1;
1303 rcu_assign_pointer(dev
->queues
[qid
], nvmeq
);
1308 dma_free_coherent(dmadev
, SQ_SIZE(depth
), (void *)nvmeq
->sq_cmds
,
1309 nvmeq
->sq_dma_addr
);
1311 dma_free_coherent(dmadev
, CQ_SIZE(depth
), (void *)nvmeq
->cqes
,
1312 nvmeq
->cq_dma_addr
);
1318 static int queue_request_irq(struct nvme_dev
*dev
, struct nvme_queue
*nvmeq
,
1321 if (use_threaded_interrupts
)
1322 return request_threaded_irq(dev
->entry
[nvmeq
->cq_vector
].vector
,
1323 nvme_irq_check
, nvme_irq
, IRQF_SHARED
,
1325 return request_irq(dev
->entry
[nvmeq
->cq_vector
].vector
, nvme_irq
,
1326 IRQF_SHARED
, name
, nvmeq
);
1329 static void nvme_init_queue(struct nvme_queue
*nvmeq
, u16 qid
)
1331 struct nvme_dev
*dev
= nvmeq
->dev
;
1332 unsigned extra
= nvme_queue_extra(nvmeq
->q_depth
);
1336 nvmeq
->cq_phase
= 1;
1337 nvmeq
->q_db
= &dev
->dbs
[qid
* 2 * dev
->db_stride
];
1338 memset(nvmeq
->cmdid_data
, 0, extra
);
1339 memset((void *)nvmeq
->cqes
, 0, CQ_SIZE(nvmeq
->q_depth
));
1340 nvme_cancel_ios(nvmeq
, false);
1341 nvmeq
->q_suspended
= 0;
1342 dev
->online_queues
++;
1345 static int nvme_create_queue(struct nvme_queue
*nvmeq
, int qid
)
1347 struct nvme_dev
*dev
= nvmeq
->dev
;
1350 result
= adapter_alloc_cq(dev
, qid
, nvmeq
);
1354 result
= adapter_alloc_sq(dev
, qid
, nvmeq
);
1358 result
= queue_request_irq(dev
, nvmeq
, nvmeq
->irqname
);
1362 spin_lock_irq(&nvmeq
->q_lock
);
1363 nvme_init_queue(nvmeq
, qid
);
1364 spin_unlock_irq(&nvmeq
->q_lock
);
1369 adapter_delete_sq(dev
, qid
);
1371 adapter_delete_cq(dev
, qid
);
1375 static int nvme_wait_ready(struct nvme_dev
*dev
, u64 cap
, bool enabled
)
1377 unsigned long timeout
;
1378 u32 bit
= enabled
? NVME_CSTS_RDY
: 0;
1380 timeout
= ((NVME_CAP_TIMEOUT(cap
) + 1) * HZ
/ 2) + jiffies
;
1382 while ((readl(&dev
->bar
->csts
) & NVME_CSTS_RDY
) != bit
) {
1384 if (fatal_signal_pending(current
))
1386 if (time_after(jiffies
, timeout
)) {
1387 dev_err(&dev
->pci_dev
->dev
,
1388 "Device not ready; aborting %s\n", enabled
?
1389 "initialisation" : "reset");
1398 * If the device has been passed off to us in an enabled state, just clear
1399 * the enabled bit. The spec says we should set the 'shutdown notification
1400 * bits', but doing so may cause the device to complete commands to the
1401 * admin queue ... and we don't know what memory that might be pointing at!
1403 static int nvme_disable_ctrl(struct nvme_dev
*dev
, u64 cap
)
1405 u32 cc
= readl(&dev
->bar
->cc
);
1407 if (cc
& NVME_CC_ENABLE
)
1408 writel(cc
& ~NVME_CC_ENABLE
, &dev
->bar
->cc
);
1409 return nvme_wait_ready(dev
, cap
, false);
1412 static int nvme_enable_ctrl(struct nvme_dev
*dev
, u64 cap
)
1414 return nvme_wait_ready(dev
, cap
, true);
1417 static int nvme_shutdown_ctrl(struct nvme_dev
*dev
)
1419 unsigned long timeout
;
1422 cc
= (readl(&dev
->bar
->cc
) & ~NVME_CC_SHN_MASK
) | NVME_CC_SHN_NORMAL
;
1423 writel(cc
, &dev
->bar
->cc
);
1425 timeout
= 2 * HZ
+ jiffies
;
1426 while ((readl(&dev
->bar
->csts
) & NVME_CSTS_SHST_MASK
) !=
1427 NVME_CSTS_SHST_CMPLT
) {
1429 if (fatal_signal_pending(current
))
1431 if (time_after(jiffies
, timeout
)) {
1432 dev_err(&dev
->pci_dev
->dev
,
1433 "Device shutdown incomplete; abort shutdown\n");
1441 static int nvme_configure_admin_queue(struct nvme_dev
*dev
)
1445 u64 cap
= readq(&dev
->bar
->cap
);
1446 struct nvme_queue
*nvmeq
;
1448 result
= nvme_disable_ctrl(dev
, cap
);
1452 nvmeq
= raw_nvmeq(dev
, 0);
1454 nvmeq
= nvme_alloc_queue(dev
, 0, 64, 0);
1459 aqa
= nvmeq
->q_depth
- 1;
1462 dev
->ctrl_config
= NVME_CC_ENABLE
| NVME_CC_CSS_NVM
;
1463 dev
->ctrl_config
|= (PAGE_SHIFT
- 12) << NVME_CC_MPS_SHIFT
;
1464 dev
->ctrl_config
|= NVME_CC_ARB_RR
| NVME_CC_SHN_NONE
;
1465 dev
->ctrl_config
|= NVME_CC_IOSQES
| NVME_CC_IOCQES
;
1467 writel(aqa
, &dev
->bar
->aqa
);
1468 writeq(nvmeq
->sq_dma_addr
, &dev
->bar
->asq
);
1469 writeq(nvmeq
->cq_dma_addr
, &dev
->bar
->acq
);
1470 writel(dev
->ctrl_config
, &dev
->bar
->cc
);
1472 result
= nvme_enable_ctrl(dev
, cap
);
1476 result
= queue_request_irq(dev
, nvmeq
, nvmeq
->irqname
);
1480 spin_lock_irq(&nvmeq
->q_lock
);
1481 nvme_init_queue(nvmeq
, 0);
1482 spin_unlock_irq(&nvmeq
->q_lock
);
1486 struct nvme_iod
*nvme_map_user_pages(struct nvme_dev
*dev
, int write
,
1487 unsigned long addr
, unsigned length
)
1489 int i
, err
, count
, nents
, offset
;
1490 struct scatterlist
*sg
;
1491 struct page
**pages
;
1492 struct nvme_iod
*iod
;
1495 return ERR_PTR(-EINVAL
);
1496 if (!length
|| length
> INT_MAX
- PAGE_SIZE
)
1497 return ERR_PTR(-EINVAL
);
1499 offset
= offset_in_page(addr
);
1500 count
= DIV_ROUND_UP(offset
+ length
, PAGE_SIZE
);
1501 pages
= kcalloc(count
, sizeof(*pages
), GFP_KERNEL
);
1503 return ERR_PTR(-ENOMEM
);
1505 err
= get_user_pages_fast(addr
, count
, 1, pages
);
1513 iod
= nvme_alloc_iod(count
, length
, GFP_KERNEL
);
1518 sg_init_table(sg
, count
);
1519 for (i
= 0; i
< count
; i
++) {
1520 sg_set_page(&sg
[i
], pages
[i
],
1521 min_t(unsigned, length
, PAGE_SIZE
- offset
),
1523 length
-= (PAGE_SIZE
- offset
);
1526 sg_mark_end(&sg
[i
- 1]);
1529 nents
= dma_map_sg(&dev
->pci_dev
->dev
, sg
, count
,
1530 write
? DMA_TO_DEVICE
: DMA_FROM_DEVICE
);
1540 for (i
= 0; i
< count
; i
++)
1543 return ERR_PTR(err
);
1546 void nvme_unmap_user_pages(struct nvme_dev
*dev
, int write
,
1547 struct nvme_iod
*iod
)
1551 dma_unmap_sg(&dev
->pci_dev
->dev
, iod
->sg
, iod
->nents
,
1552 write
? DMA_TO_DEVICE
: DMA_FROM_DEVICE
);
1554 for (i
= 0; i
< iod
->nents
; i
++)
1555 put_page(sg_page(&iod
->sg
[i
]));
1558 static int nvme_submit_io(struct nvme_ns
*ns
, struct nvme_user_io __user
*uio
)
1560 struct nvme_dev
*dev
= ns
->dev
;
1561 struct nvme_user_io io
;
1562 struct nvme_command c
;
1563 unsigned length
, meta_len
;
1565 struct nvme_iod
*iod
, *meta_iod
= NULL
;
1566 dma_addr_t meta_dma_addr
;
1567 void *meta
, *uninitialized_var(meta_mem
);
1569 if (copy_from_user(&io
, uio
, sizeof(io
)))
1571 length
= (io
.nblocks
+ 1) << ns
->lba_shift
;
1572 meta_len
= (io
.nblocks
+ 1) * ns
->ms
;
1574 if (meta_len
&& ((io
.metadata
& 3) || !io
.metadata
))
1577 switch (io
.opcode
) {
1578 case nvme_cmd_write
:
1580 case nvme_cmd_compare
:
1581 iod
= nvme_map_user_pages(dev
, io
.opcode
& 1, io
.addr
, length
);
1588 return PTR_ERR(iod
);
1590 memset(&c
, 0, sizeof(c
));
1591 c
.rw
.opcode
= io
.opcode
;
1592 c
.rw
.flags
= io
.flags
;
1593 c
.rw
.nsid
= cpu_to_le32(ns
->ns_id
);
1594 c
.rw
.slba
= cpu_to_le64(io
.slba
);
1595 c
.rw
.length
= cpu_to_le16(io
.nblocks
);
1596 c
.rw
.control
= cpu_to_le16(io
.control
);
1597 c
.rw
.dsmgmt
= cpu_to_le32(io
.dsmgmt
);
1598 c
.rw
.reftag
= cpu_to_le32(io
.reftag
);
1599 c
.rw
.apptag
= cpu_to_le16(io
.apptag
);
1600 c
.rw
.appmask
= cpu_to_le16(io
.appmask
);
1603 meta_iod
= nvme_map_user_pages(dev
, io
.opcode
& 1, io
.metadata
,
1605 if (IS_ERR(meta_iod
)) {
1606 status
= PTR_ERR(meta_iod
);
1611 meta_mem
= dma_alloc_coherent(&dev
->pci_dev
->dev
, meta_len
,
1612 &meta_dma_addr
, GFP_KERNEL
);
1618 if (io
.opcode
& 1) {
1619 int meta_offset
= 0;
1621 for (i
= 0; i
< meta_iod
->nents
; i
++) {
1622 meta
= kmap_atomic(sg_page(&meta_iod
->sg
[i
])) +
1623 meta_iod
->sg
[i
].offset
;
1624 memcpy(meta_mem
+ meta_offset
, meta
,
1625 meta_iod
->sg
[i
].length
);
1626 kunmap_atomic(meta
);
1627 meta_offset
+= meta_iod
->sg
[i
].length
;
1631 c
.rw
.metadata
= cpu_to_le64(meta_dma_addr
);
1634 length
= nvme_setup_prps(dev
, iod
, length
, GFP_KERNEL
);
1635 c
.rw
.prp1
= cpu_to_le64(sg_dma_address(iod
->sg
));
1636 c
.rw
.prp2
= cpu_to_le64(iod
->first_dma
);
1638 if (length
!= (io
.nblocks
+ 1) << ns
->lba_shift
)
1641 status
= nvme_submit_io_cmd(dev
, &c
, NULL
);
1644 if (status
== NVME_SC_SUCCESS
&& !(io
.opcode
& 1)) {
1645 int meta_offset
= 0;
1647 for (i
= 0; i
< meta_iod
->nents
; i
++) {
1648 meta
= kmap_atomic(sg_page(&meta_iod
->sg
[i
])) +
1649 meta_iod
->sg
[i
].offset
;
1650 memcpy(meta
, meta_mem
+ meta_offset
,
1651 meta_iod
->sg
[i
].length
);
1652 kunmap_atomic(meta
);
1653 meta_offset
+= meta_iod
->sg
[i
].length
;
1657 dma_free_coherent(&dev
->pci_dev
->dev
, meta_len
, meta_mem
,
1662 nvme_unmap_user_pages(dev
, io
.opcode
& 1, iod
);
1663 nvme_free_iod(dev
, iod
);
1666 nvme_unmap_user_pages(dev
, io
.opcode
& 1, meta_iod
);
1667 nvme_free_iod(dev
, meta_iod
);
1673 static int nvme_user_admin_cmd(struct nvme_dev
*dev
,
1674 struct nvme_admin_cmd __user
*ucmd
)
1676 struct nvme_admin_cmd cmd
;
1677 struct nvme_command c
;
1679 struct nvme_iod
*uninitialized_var(iod
);
1682 if (!capable(CAP_SYS_ADMIN
))
1684 if (copy_from_user(&cmd
, ucmd
, sizeof(cmd
)))
1687 memset(&c
, 0, sizeof(c
));
1688 c
.common
.opcode
= cmd
.opcode
;
1689 c
.common
.flags
= cmd
.flags
;
1690 c
.common
.nsid
= cpu_to_le32(cmd
.nsid
);
1691 c
.common
.cdw2
[0] = cpu_to_le32(cmd
.cdw2
);
1692 c
.common
.cdw2
[1] = cpu_to_le32(cmd
.cdw3
);
1693 c
.common
.cdw10
[0] = cpu_to_le32(cmd
.cdw10
);
1694 c
.common
.cdw10
[1] = cpu_to_le32(cmd
.cdw11
);
1695 c
.common
.cdw10
[2] = cpu_to_le32(cmd
.cdw12
);
1696 c
.common
.cdw10
[3] = cpu_to_le32(cmd
.cdw13
);
1697 c
.common
.cdw10
[4] = cpu_to_le32(cmd
.cdw14
);
1698 c
.common
.cdw10
[5] = cpu_to_le32(cmd
.cdw15
);
1700 length
= cmd
.data_len
;
1702 iod
= nvme_map_user_pages(dev
, cmd
.opcode
& 1, cmd
.addr
,
1705 return PTR_ERR(iod
);
1706 length
= nvme_setup_prps(dev
, iod
, length
, GFP_KERNEL
);
1707 c
.common
.prp1
= cpu_to_le64(sg_dma_address(iod
->sg
));
1708 c
.common
.prp2
= cpu_to_le64(iod
->first_dma
);
1711 timeout
= cmd
.timeout_ms
? msecs_to_jiffies(cmd
.timeout_ms
) :
1713 if (length
!= cmd
.data_len
)
1716 status
= nvme_submit_sync_cmd(dev
, 0, &c
, &cmd
.result
, timeout
);
1719 nvme_unmap_user_pages(dev
, cmd
.opcode
& 1, iod
);
1720 nvme_free_iod(dev
, iod
);
1723 if ((status
>= 0) && copy_to_user(&ucmd
->result
, &cmd
.result
,
1724 sizeof(cmd
.result
)))
1730 static int nvme_ioctl(struct block_device
*bdev
, fmode_t mode
, unsigned int cmd
,
1733 struct nvme_ns
*ns
= bdev
->bd_disk
->private_data
;
1737 force_successful_syscall_return();
1739 case NVME_IOCTL_ADMIN_CMD
:
1740 return nvme_user_admin_cmd(ns
->dev
, (void __user
*)arg
);
1741 case NVME_IOCTL_SUBMIT_IO
:
1742 return nvme_submit_io(ns
, (void __user
*)arg
);
1743 case SG_GET_VERSION_NUM
:
1744 return nvme_sg_get_version_num((void __user
*)arg
);
1746 return nvme_sg_io(ns
, (void __user
*)arg
);
1752 #ifdef CONFIG_COMPAT
1753 static int nvme_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1754 unsigned int cmd
, unsigned long arg
)
1756 struct nvme_ns
*ns
= bdev
->bd_disk
->private_data
;
1760 return nvme_sg_io32(ns
, arg
);
1762 return nvme_ioctl(bdev
, mode
, cmd
, arg
);
1765 #define nvme_compat_ioctl NULL
1768 static int nvme_open(struct block_device
*bdev
, fmode_t mode
)
1770 struct nvme_ns
*ns
= bdev
->bd_disk
->private_data
;
1771 struct nvme_dev
*dev
= ns
->dev
;
1773 kref_get(&dev
->kref
);
1777 static void nvme_free_dev(struct kref
*kref
);
1779 static void nvme_release(struct gendisk
*disk
, fmode_t mode
)
1781 struct nvme_ns
*ns
= disk
->private_data
;
1782 struct nvme_dev
*dev
= ns
->dev
;
1784 kref_put(&dev
->kref
, nvme_free_dev
);
1787 static int nvme_getgeo(struct block_device
*bd
, struct hd_geometry
*geo
)
1789 /* some standard values */
1790 geo
->heads
= 1 << 6;
1791 geo
->sectors
= 1 << 5;
1792 geo
->cylinders
= get_capacity(bd
->bd_disk
) >> 11;
1796 static const struct block_device_operations nvme_fops
= {
1797 .owner
= THIS_MODULE
,
1798 .ioctl
= nvme_ioctl
,
1799 .compat_ioctl
= nvme_compat_ioctl
,
1801 .release
= nvme_release
,
1802 .getgeo
= nvme_getgeo
,
1805 static void nvme_resubmit_iods(struct nvme_queue
*nvmeq
)
1807 struct nvme_iod
*iod
, *next
;
1809 list_for_each_entry_safe(iod
, next
, &nvmeq
->iod_bio
, node
) {
1810 if (unlikely(nvme_submit_iod(nvmeq
, iod
)))
1812 list_del(&iod
->node
);
1813 if (bio_list_empty(&nvmeq
->sq_cong
) &&
1814 list_empty(&nvmeq
->iod_bio
))
1815 remove_wait_queue(&nvmeq
->sq_full
,
1816 &nvmeq
->sq_cong_wait
);
1820 static void nvme_resubmit_bios(struct nvme_queue
*nvmeq
)
1822 while (bio_list_peek(&nvmeq
->sq_cong
)) {
1823 struct bio
*bio
= bio_list_pop(&nvmeq
->sq_cong
);
1824 struct nvme_ns
*ns
= bio
->bi_bdev
->bd_disk
->private_data
;
1826 if (bio_list_empty(&nvmeq
->sq_cong
) &&
1827 list_empty(&nvmeq
->iod_bio
))
1828 remove_wait_queue(&nvmeq
->sq_full
,
1829 &nvmeq
->sq_cong_wait
);
1830 if (nvme_submit_bio_queue(nvmeq
, ns
, bio
)) {
1831 if (!waitqueue_active(&nvmeq
->sq_full
))
1832 add_wait_queue(&nvmeq
->sq_full
,
1833 &nvmeq
->sq_cong_wait
);
1834 bio_list_add_head(&nvmeq
->sq_cong
, bio
);
1840 static int nvme_kthread(void *data
)
1842 struct nvme_dev
*dev
, *next
;
1844 while (!kthread_should_stop()) {
1845 set_current_state(TASK_INTERRUPTIBLE
);
1846 spin_lock(&dev_list_lock
);
1847 list_for_each_entry_safe(dev
, next
, &dev_list
, node
) {
1849 if (readl(&dev
->bar
->csts
) & NVME_CSTS_CFS
&&
1851 if (work_busy(&dev
->reset_work
))
1853 list_del_init(&dev
->node
);
1854 dev_warn(&dev
->pci_dev
->dev
,
1855 "Failed status, reset controller\n");
1856 dev
->reset_workfn
= nvme_reset_failed_dev
;
1857 queue_work(nvme_workq
, &dev
->reset_work
);
1861 for (i
= 0; i
< dev
->queue_count
; i
++) {
1862 struct nvme_queue
*nvmeq
=
1863 rcu_dereference(dev
->queues
[i
]);
1866 spin_lock_irq(&nvmeq
->q_lock
);
1867 if (nvmeq
->q_suspended
)
1869 nvme_process_cq(nvmeq
);
1870 nvme_cancel_ios(nvmeq
, true);
1871 nvme_resubmit_bios(nvmeq
);
1872 nvme_resubmit_iods(nvmeq
);
1874 spin_unlock_irq(&nvmeq
->q_lock
);
1878 spin_unlock(&dev_list_lock
);
1879 schedule_timeout(round_jiffies_relative(HZ
));
1884 static void nvme_config_discard(struct nvme_ns
*ns
)
1886 u32 logical_block_size
= queue_logical_block_size(ns
->queue
);
1887 ns
->queue
->limits
.discard_zeroes_data
= 0;
1888 ns
->queue
->limits
.discard_alignment
= logical_block_size
;
1889 ns
->queue
->limits
.discard_granularity
= logical_block_size
;
1890 ns
->queue
->limits
.max_discard_sectors
= 0xffffffff;
1891 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, ns
->queue
);
1894 static struct nvme_ns
*nvme_alloc_ns(struct nvme_dev
*dev
, unsigned nsid
,
1895 struct nvme_id_ns
*id
, struct nvme_lba_range_type
*rt
)
1898 struct gendisk
*disk
;
1901 if (rt
->attributes
& NVME_LBART_ATTRIB_HIDE
)
1904 ns
= kzalloc(sizeof(*ns
), GFP_KERNEL
);
1907 ns
->queue
= blk_alloc_queue(GFP_KERNEL
);
1910 ns
->queue
->queue_flags
= QUEUE_FLAG_DEFAULT
;
1911 queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES
, ns
->queue
);
1912 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, ns
->queue
);
1913 blk_queue_make_request(ns
->queue
, nvme_make_request
);
1915 ns
->queue
->queuedata
= ns
;
1917 disk
= alloc_disk(0);
1919 goto out_free_queue
;
1922 lbaf
= id
->flbas
& 0xf;
1923 ns
->lba_shift
= id
->lbaf
[lbaf
].ds
;
1924 ns
->ms
= le16_to_cpu(id
->lbaf
[lbaf
].ms
);
1925 blk_queue_logical_block_size(ns
->queue
, 1 << ns
->lba_shift
);
1926 if (dev
->max_hw_sectors
)
1927 blk_queue_max_hw_sectors(ns
->queue
, dev
->max_hw_sectors
);
1928 if (dev
->vwc
& NVME_CTRL_VWC_PRESENT
)
1929 blk_queue_flush(ns
->queue
, REQ_FLUSH
| REQ_FUA
);
1931 disk
->major
= nvme_major
;
1932 disk
->first_minor
= 0;
1933 disk
->fops
= &nvme_fops
;
1934 disk
->private_data
= ns
;
1935 disk
->queue
= ns
->queue
;
1936 disk
->driverfs_dev
= &dev
->pci_dev
->dev
;
1937 disk
->flags
= GENHD_FL_EXT_DEVT
;
1938 sprintf(disk
->disk_name
, "nvme%dn%d", dev
->instance
, nsid
);
1939 set_capacity(disk
, le64_to_cpup(&id
->nsze
) << (ns
->lba_shift
- 9));
1941 if (dev
->oncs
& NVME_CTRL_ONCS_DSM
)
1942 nvme_config_discard(ns
);
1947 blk_cleanup_queue(ns
->queue
);
1953 static int nvme_find_closest_node(int node
)
1955 int n
, val
, min_val
= INT_MAX
, best_node
= node
;
1957 for_each_online_node(n
) {
1960 val
= node_distance(node
, n
);
1961 if (val
< min_val
) {
1969 static void nvme_set_queue_cpus(cpumask_t
*qmask
, struct nvme_queue
*nvmeq
,
1973 for_each_cpu(cpu
, qmask
) {
1974 if (cpumask_weight(nvmeq
->cpu_mask
) >= count
)
1976 if (!cpumask_test_and_set_cpu(cpu
, nvmeq
->cpu_mask
))
1977 *per_cpu_ptr(nvmeq
->dev
->io_queue
, cpu
) = nvmeq
->qid
;
1981 static void nvme_add_cpus(cpumask_t
*mask
, const cpumask_t
*unassigned_cpus
,
1982 const cpumask_t
*new_mask
, struct nvme_queue
*nvmeq
, int cpus_per_queue
)
1985 for_each_cpu(next_cpu
, new_mask
) {
1986 cpumask_or(mask
, mask
, get_cpu_mask(next_cpu
));
1987 cpumask_or(mask
, mask
, topology_thread_cpumask(next_cpu
));
1988 cpumask_and(mask
, mask
, unassigned_cpus
);
1989 nvme_set_queue_cpus(mask
, nvmeq
, cpus_per_queue
);
1993 static void nvme_create_io_queues(struct nvme_dev
*dev
)
1997 max
= min(dev
->max_qid
, num_online_cpus());
1998 for (i
= dev
->queue_count
; i
<= max
; i
++)
1999 if (!nvme_alloc_queue(dev
, i
, dev
->q_depth
, i
- 1))
2002 max
= min(dev
->queue_count
- 1, num_online_cpus());
2003 for (i
= dev
->online_queues
; i
<= max
; i
++)
2004 if (nvme_create_queue(raw_nvmeq(dev
, i
), i
))
2009 * If there are fewer queues than online cpus, this will try to optimally
2010 * assign a queue to multiple cpus by grouping cpus that are "close" together:
2011 * thread siblings, core, socket, closest node, then whatever else is
2014 static void nvme_assign_io_queues(struct nvme_dev
*dev
)
2016 unsigned cpu
, cpus_per_queue
, queues
, remainder
, i
;
2017 cpumask_var_t unassigned_cpus
;
2019 nvme_create_io_queues(dev
);
2021 queues
= min(dev
->online_queues
- 1, num_online_cpus());
2025 cpus_per_queue
= num_online_cpus() / queues
;
2026 remainder
= queues
- (num_online_cpus() - queues
* cpus_per_queue
);
2028 if (!alloc_cpumask_var(&unassigned_cpus
, GFP_KERNEL
))
2031 cpumask_copy(unassigned_cpus
, cpu_online_mask
);
2032 cpu
= cpumask_first(unassigned_cpus
);
2033 for (i
= 1; i
<= queues
; i
++) {
2034 struct nvme_queue
*nvmeq
= lock_nvmeq(dev
, i
);
2037 cpumask_clear(nvmeq
->cpu_mask
);
2038 if (!cpumask_weight(unassigned_cpus
)) {
2039 unlock_nvmeq(nvmeq
);
2043 mask
= *get_cpu_mask(cpu
);
2044 nvme_set_queue_cpus(&mask
, nvmeq
, cpus_per_queue
);
2045 if (cpus_weight(mask
) < cpus_per_queue
)
2046 nvme_add_cpus(&mask
, unassigned_cpus
,
2047 topology_thread_cpumask(cpu
),
2048 nvmeq
, cpus_per_queue
);
2049 if (cpus_weight(mask
) < cpus_per_queue
)
2050 nvme_add_cpus(&mask
, unassigned_cpus
,
2051 topology_core_cpumask(cpu
),
2052 nvmeq
, cpus_per_queue
);
2053 if (cpus_weight(mask
) < cpus_per_queue
)
2054 nvme_add_cpus(&mask
, unassigned_cpus
,
2055 cpumask_of_node(cpu_to_node(cpu
)),
2056 nvmeq
, cpus_per_queue
);
2057 if (cpus_weight(mask
) < cpus_per_queue
)
2058 nvme_add_cpus(&mask
, unassigned_cpus
,
2060 nvme_find_closest_node(
2062 nvmeq
, cpus_per_queue
);
2063 if (cpus_weight(mask
) < cpus_per_queue
)
2064 nvme_add_cpus(&mask
, unassigned_cpus
,
2066 nvmeq
, cpus_per_queue
);
2068 WARN(cpumask_weight(nvmeq
->cpu_mask
) != cpus_per_queue
,
2069 "nvme%d qid:%d mis-matched queue-to-cpu assignment\n",
2072 irq_set_affinity_hint(dev
->entry
[nvmeq
->cq_vector
].vector
,
2074 cpumask_andnot(unassigned_cpus
, unassigned_cpus
,
2076 cpu
= cpumask_next(cpu
, unassigned_cpus
);
2077 if (remainder
&& !--remainder
)
2079 unlock_nvmeq(nvmeq
);
2081 WARN(cpumask_weight(unassigned_cpus
), "nvme%d unassigned online cpus\n",
2084 cpumask_andnot(unassigned_cpus
, cpu_possible_mask
, cpu_online_mask
);
2085 for_each_cpu(cpu
, unassigned_cpus
)
2086 *per_cpu_ptr(dev
->io_queue
, cpu
) = (i
++ % queues
) + 1;
2087 free_cpumask_var(unassigned_cpus
);
2090 static int set_queue_count(struct nvme_dev
*dev
, int count
)
2094 u32 q_count
= (count
- 1) | ((count
- 1) << 16);
2096 status
= nvme_set_features(dev
, NVME_FEAT_NUM_QUEUES
, q_count
, 0,
2101 dev_err(&dev
->pci_dev
->dev
, "Could not set queue count (%d)\n",
2105 return min(result
& 0xffff, result
>> 16) + 1;
2108 static size_t db_bar_size(struct nvme_dev
*dev
, unsigned nr_io_queues
)
2110 return 4096 + ((nr_io_queues
+ 1) * 8 * dev
->db_stride
);
2113 static int nvme_cpu_notify(struct notifier_block
*self
,
2114 unsigned long action
, void *hcpu
)
2116 struct nvme_dev
*dev
= container_of(self
, struct nvme_dev
, nb
);
2120 nvme_assign_io_queues(dev
);
2126 static int nvme_setup_io_queues(struct nvme_dev
*dev
)
2128 struct nvme_queue
*adminq
= raw_nvmeq(dev
, 0);
2129 struct pci_dev
*pdev
= dev
->pci_dev
;
2130 int result
, i
, vecs
, nr_io_queues
, size
;
2132 nr_io_queues
= num_possible_cpus();
2133 result
= set_queue_count(dev
, nr_io_queues
);
2136 if (result
< nr_io_queues
)
2137 nr_io_queues
= result
;
2139 size
= db_bar_size(dev
, nr_io_queues
);
2143 dev
->bar
= ioremap(pci_resource_start(pdev
, 0), size
);
2146 if (!--nr_io_queues
)
2148 size
= db_bar_size(dev
, nr_io_queues
);
2150 dev
->dbs
= ((void __iomem
*)dev
->bar
) + 4096;
2151 adminq
->q_db
= dev
->dbs
;
2154 /* Deregister the admin queue's interrupt */
2155 free_irq(dev
->entry
[0].vector
, adminq
);
2157 for (i
= 0; i
< nr_io_queues
; i
++)
2158 dev
->entry
[i
].entry
= i
;
2159 vecs
= pci_enable_msix_range(pdev
, dev
->entry
, 1, nr_io_queues
);
2161 vecs
= pci_enable_msi_range(pdev
, 1, min(nr_io_queues
, 32));
2165 for (i
= 0; i
< vecs
; i
++)
2166 dev
->entry
[i
].vector
= i
+ pdev
->irq
;
2171 * Should investigate if there's a performance win from allocating
2172 * more queues than interrupt vectors; it might allow the submission
2173 * path to scale better, even if the receive path is limited by the
2174 * number of interrupts.
2176 nr_io_queues
= vecs
;
2177 dev
->max_qid
= nr_io_queues
;
2179 result
= queue_request_irq(dev
, adminq
, adminq
->irqname
);
2181 adminq
->q_suspended
= 1;
2185 /* Free previously allocated queues that are no longer usable */
2186 nvme_free_queues(dev
, nr_io_queues
+ 1);
2187 nvme_assign_io_queues(dev
);
2189 dev
->nb
.notifier_call
= &nvme_cpu_notify
;
2190 result
= register_hotcpu_notifier(&dev
->nb
);
2197 nvme_free_queues(dev
, 1);
2202 * Return: error value if an error occurred setting up the queues or calling
2203 * Identify Device. 0 if these succeeded, even if adding some of the
2204 * namespaces failed. At the moment, these failures are silent. TBD which
2205 * failures should be reported.
2207 static int nvme_dev_add(struct nvme_dev
*dev
)
2209 struct pci_dev
*pdev
= dev
->pci_dev
;
2213 struct nvme_id_ctrl
*ctrl
;
2214 struct nvme_id_ns
*id_ns
;
2216 dma_addr_t dma_addr
;
2217 int shift
= NVME_CAP_MPSMIN(readq(&dev
->bar
->cap
)) + 12;
2219 mem
= dma_alloc_coherent(&pdev
->dev
, 8192, &dma_addr
, GFP_KERNEL
);
2223 res
= nvme_identify(dev
, 0, 1, dma_addr
);
2225 dev_err(&pdev
->dev
, "Identify Controller failed (%d)\n", res
);
2231 nn
= le32_to_cpup(&ctrl
->nn
);
2232 dev
->oncs
= le16_to_cpup(&ctrl
->oncs
);
2233 dev
->abort_limit
= ctrl
->acl
+ 1;
2234 dev
->vwc
= ctrl
->vwc
;
2235 memcpy(dev
->serial
, ctrl
->sn
, sizeof(ctrl
->sn
));
2236 memcpy(dev
->model
, ctrl
->mn
, sizeof(ctrl
->mn
));
2237 memcpy(dev
->firmware_rev
, ctrl
->fr
, sizeof(ctrl
->fr
));
2239 dev
->max_hw_sectors
= 1 << (ctrl
->mdts
+ shift
- 9);
2240 if ((pdev
->vendor
== PCI_VENDOR_ID_INTEL
) &&
2241 (pdev
->device
== 0x0953) && ctrl
->vs
[3])
2242 dev
->stripe_size
= 1 << (ctrl
->vs
[3] + shift
);
2245 for (i
= 1; i
<= nn
; i
++) {
2246 res
= nvme_identify(dev
, i
, 0, dma_addr
);
2250 if (id_ns
->ncap
== 0)
2253 res
= nvme_get_features(dev
, NVME_FEAT_LBA_RANGE
, i
,
2254 dma_addr
+ 4096, NULL
);
2256 memset(mem
+ 4096, 0, 4096);
2258 ns
= nvme_alloc_ns(dev
, i
, mem
, mem
+ 4096);
2260 list_add_tail(&ns
->list
, &dev
->namespaces
);
2262 list_for_each_entry(ns
, &dev
->namespaces
, list
)
2267 dma_free_coherent(&dev
->pci_dev
->dev
, 8192, mem
, dma_addr
);
2271 static int nvme_dev_map(struct nvme_dev
*dev
)
2274 int bars
, result
= -ENOMEM
;
2275 struct pci_dev
*pdev
= dev
->pci_dev
;
2277 if (pci_enable_device_mem(pdev
))
2280 dev
->entry
[0].vector
= pdev
->irq
;
2281 pci_set_master(pdev
);
2282 bars
= pci_select_bars(pdev
, IORESOURCE_MEM
);
2283 if (pci_request_selected_regions(pdev
, bars
, "nvme"))
2286 if (dma_set_mask_and_coherent(&pdev
->dev
, DMA_BIT_MASK(64)) &&
2287 dma_set_mask_and_coherent(&pdev
->dev
, DMA_BIT_MASK(32)))
2290 dev
->bar
= ioremap(pci_resource_start(pdev
, 0), 8192);
2293 if (readl(&dev
->bar
->csts
) == -1) {
2297 cap
= readq(&dev
->bar
->cap
);
2298 dev
->q_depth
= min_t(int, NVME_CAP_MQES(cap
) + 1, NVME_Q_DEPTH
);
2299 dev
->db_stride
= 1 << NVME_CAP_STRIDE(cap
);
2300 dev
->dbs
= ((void __iomem
*)dev
->bar
) + 4096;
2308 pci_release_regions(pdev
);
2310 pci_disable_device(pdev
);
2314 static void nvme_dev_unmap(struct nvme_dev
*dev
)
2316 if (dev
->pci_dev
->msi_enabled
)
2317 pci_disable_msi(dev
->pci_dev
);
2318 else if (dev
->pci_dev
->msix_enabled
)
2319 pci_disable_msix(dev
->pci_dev
);
2324 pci_release_regions(dev
->pci_dev
);
2327 if (pci_is_enabled(dev
->pci_dev
))
2328 pci_disable_device(dev
->pci_dev
);
2331 struct nvme_delq_ctx
{
2332 struct task_struct
*waiter
;
2333 struct kthread_worker
*worker
;
2337 static void nvme_wait_dq(struct nvme_delq_ctx
*dq
, struct nvme_dev
*dev
)
2339 dq
->waiter
= current
;
2343 set_current_state(TASK_KILLABLE
);
2344 if (!atomic_read(&dq
->refcount
))
2346 if (!schedule_timeout(ADMIN_TIMEOUT
) ||
2347 fatal_signal_pending(current
)) {
2348 set_current_state(TASK_RUNNING
);
2350 nvme_disable_ctrl(dev
, readq(&dev
->bar
->cap
));
2351 nvme_disable_queue(dev
, 0);
2353 send_sig(SIGKILL
, dq
->worker
->task
, 1);
2354 flush_kthread_worker(dq
->worker
);
2358 set_current_state(TASK_RUNNING
);
2361 static void nvme_put_dq(struct nvme_delq_ctx
*dq
)
2363 atomic_dec(&dq
->refcount
);
2365 wake_up_process(dq
->waiter
);
2368 static struct nvme_delq_ctx
*nvme_get_dq(struct nvme_delq_ctx
*dq
)
2370 atomic_inc(&dq
->refcount
);
2374 static void nvme_del_queue_end(struct nvme_queue
*nvmeq
)
2376 struct nvme_delq_ctx
*dq
= nvmeq
->cmdinfo
.ctx
;
2378 nvme_clear_queue(nvmeq
);
2382 static int adapter_async_del_queue(struct nvme_queue
*nvmeq
, u8 opcode
,
2383 kthread_work_func_t fn
)
2385 struct nvme_command c
;
2387 memset(&c
, 0, sizeof(c
));
2388 c
.delete_queue
.opcode
= opcode
;
2389 c
.delete_queue
.qid
= cpu_to_le16(nvmeq
->qid
);
2391 init_kthread_work(&nvmeq
->cmdinfo
.work
, fn
);
2392 return nvme_submit_admin_cmd_async(nvmeq
->dev
, &c
, &nvmeq
->cmdinfo
);
2395 static void nvme_del_cq_work_handler(struct kthread_work
*work
)
2397 struct nvme_queue
*nvmeq
= container_of(work
, struct nvme_queue
,
2399 nvme_del_queue_end(nvmeq
);
2402 static int nvme_delete_cq(struct nvme_queue
*nvmeq
)
2404 return adapter_async_del_queue(nvmeq
, nvme_admin_delete_cq
,
2405 nvme_del_cq_work_handler
);
2408 static void nvme_del_sq_work_handler(struct kthread_work
*work
)
2410 struct nvme_queue
*nvmeq
= container_of(work
, struct nvme_queue
,
2412 int status
= nvmeq
->cmdinfo
.status
;
2415 status
= nvme_delete_cq(nvmeq
);
2417 nvme_del_queue_end(nvmeq
);
2420 static int nvme_delete_sq(struct nvme_queue
*nvmeq
)
2422 return adapter_async_del_queue(nvmeq
, nvme_admin_delete_sq
,
2423 nvme_del_sq_work_handler
);
2426 static void nvme_del_queue_start(struct kthread_work
*work
)
2428 struct nvme_queue
*nvmeq
= container_of(work
, struct nvme_queue
,
2430 allow_signal(SIGKILL
);
2431 if (nvme_delete_sq(nvmeq
))
2432 nvme_del_queue_end(nvmeq
);
2435 static void nvme_disable_io_queues(struct nvme_dev
*dev
)
2438 DEFINE_KTHREAD_WORKER_ONSTACK(worker
);
2439 struct nvme_delq_ctx dq
;
2440 struct task_struct
*kworker_task
= kthread_run(kthread_worker_fn
,
2441 &worker
, "nvme%d", dev
->instance
);
2443 if (IS_ERR(kworker_task
)) {
2444 dev_err(&dev
->pci_dev
->dev
,
2445 "Failed to create queue del task\n");
2446 for (i
= dev
->queue_count
- 1; i
> 0; i
--)
2447 nvme_disable_queue(dev
, i
);
2452 atomic_set(&dq
.refcount
, 0);
2453 dq
.worker
= &worker
;
2454 for (i
= dev
->queue_count
- 1; i
> 0; i
--) {
2455 struct nvme_queue
*nvmeq
= raw_nvmeq(dev
, i
);
2457 if (nvme_suspend_queue(nvmeq
))
2459 nvmeq
->cmdinfo
.ctx
= nvme_get_dq(&dq
);
2460 nvmeq
->cmdinfo
.worker
= dq
.worker
;
2461 init_kthread_work(&nvmeq
->cmdinfo
.work
, nvme_del_queue_start
);
2462 queue_kthread_work(dq
.worker
, &nvmeq
->cmdinfo
.work
);
2464 nvme_wait_dq(&dq
, dev
);
2465 kthread_stop(kworker_task
);
2469 * Remove the node from the device list and check
2470 * for whether or not we need to stop the nvme_thread.
2472 static void nvme_dev_list_remove(struct nvme_dev
*dev
)
2474 struct task_struct
*tmp
= NULL
;
2476 spin_lock(&dev_list_lock
);
2477 list_del_init(&dev
->node
);
2478 if (list_empty(&dev_list
) && !IS_ERR_OR_NULL(nvme_thread
)) {
2482 spin_unlock(&dev_list_lock
);
2488 static void nvme_dev_shutdown(struct nvme_dev
*dev
)
2492 dev
->initialized
= 0;
2493 unregister_hotcpu_notifier(&dev
->nb
);
2495 nvme_dev_list_remove(dev
);
2497 if (!dev
->bar
|| (dev
->bar
&& readl(&dev
->bar
->csts
) == -1)) {
2498 for (i
= dev
->queue_count
- 1; i
>= 0; i
--) {
2499 struct nvme_queue
*nvmeq
= raw_nvmeq(dev
, i
);
2500 nvme_suspend_queue(nvmeq
);
2501 nvme_clear_queue(nvmeq
);
2504 nvme_disable_io_queues(dev
);
2505 nvme_shutdown_ctrl(dev
);
2506 nvme_disable_queue(dev
, 0);
2508 nvme_dev_unmap(dev
);
2511 static void nvme_dev_remove(struct nvme_dev
*dev
)
2515 list_for_each_entry(ns
, &dev
->namespaces
, list
) {
2516 if (ns
->disk
->flags
& GENHD_FL_UP
)
2517 del_gendisk(ns
->disk
);
2518 if (!blk_queue_dying(ns
->queue
))
2519 blk_cleanup_queue(ns
->queue
);
2523 static int nvme_setup_prp_pools(struct nvme_dev
*dev
)
2525 struct device
*dmadev
= &dev
->pci_dev
->dev
;
2526 dev
->prp_page_pool
= dma_pool_create("prp list page", dmadev
,
2527 PAGE_SIZE
, PAGE_SIZE
, 0);
2528 if (!dev
->prp_page_pool
)
2531 /* Optimisation for I/Os between 4k and 128k */
2532 dev
->prp_small_pool
= dma_pool_create("prp list 256", dmadev
,
2534 if (!dev
->prp_small_pool
) {
2535 dma_pool_destroy(dev
->prp_page_pool
);
2541 static void nvme_release_prp_pools(struct nvme_dev
*dev
)
2543 dma_pool_destroy(dev
->prp_page_pool
);
2544 dma_pool_destroy(dev
->prp_small_pool
);
2547 static DEFINE_IDA(nvme_instance_ida
);
2549 static int nvme_set_instance(struct nvme_dev
*dev
)
2551 int instance
, error
;
2554 if (!ida_pre_get(&nvme_instance_ida
, GFP_KERNEL
))
2557 spin_lock(&dev_list_lock
);
2558 error
= ida_get_new(&nvme_instance_ida
, &instance
);
2559 spin_unlock(&dev_list_lock
);
2560 } while (error
== -EAGAIN
);
2565 dev
->instance
= instance
;
2569 static void nvme_release_instance(struct nvme_dev
*dev
)
2571 spin_lock(&dev_list_lock
);
2572 ida_remove(&nvme_instance_ida
, dev
->instance
);
2573 spin_unlock(&dev_list_lock
);
2576 static void nvme_free_namespaces(struct nvme_dev
*dev
)
2578 struct nvme_ns
*ns
, *next
;
2580 list_for_each_entry_safe(ns
, next
, &dev
->namespaces
, list
) {
2581 list_del(&ns
->list
);
2587 static void nvme_free_dev(struct kref
*kref
)
2589 struct nvme_dev
*dev
= container_of(kref
, struct nvme_dev
, kref
);
2591 nvme_free_namespaces(dev
);
2592 free_percpu(dev
->io_queue
);
2598 static int nvme_dev_open(struct inode
*inode
, struct file
*f
)
2600 struct nvme_dev
*dev
= container_of(f
->private_data
, struct nvme_dev
,
2602 kref_get(&dev
->kref
);
2603 f
->private_data
= dev
;
2607 static int nvme_dev_release(struct inode
*inode
, struct file
*f
)
2609 struct nvme_dev
*dev
= f
->private_data
;
2610 kref_put(&dev
->kref
, nvme_free_dev
);
2614 static long nvme_dev_ioctl(struct file
*f
, unsigned int cmd
, unsigned long arg
)
2616 struct nvme_dev
*dev
= f
->private_data
;
2618 case NVME_IOCTL_ADMIN_CMD
:
2619 return nvme_user_admin_cmd(dev
, (void __user
*)arg
);
2625 static const struct file_operations nvme_dev_fops
= {
2626 .owner
= THIS_MODULE
,
2627 .open
= nvme_dev_open
,
2628 .release
= nvme_dev_release
,
2629 .unlocked_ioctl
= nvme_dev_ioctl
,
2630 .compat_ioctl
= nvme_dev_ioctl
,
2633 static int nvme_dev_start(struct nvme_dev
*dev
)
2636 bool start_thread
= false;
2638 result
= nvme_dev_map(dev
);
2642 result
= nvme_configure_admin_queue(dev
);
2646 spin_lock(&dev_list_lock
);
2647 if (list_empty(&dev_list
) && IS_ERR_OR_NULL(nvme_thread
)) {
2648 start_thread
= true;
2651 list_add(&dev
->node
, &dev_list
);
2652 spin_unlock(&dev_list_lock
);
2655 nvme_thread
= kthread_run(nvme_kthread
, NULL
, "nvme");
2656 wake_up(&nvme_kthread_wait
);
2658 wait_event_killable(nvme_kthread_wait
, nvme_thread
);
2660 if (IS_ERR_OR_NULL(nvme_thread
)) {
2661 result
= nvme_thread
? PTR_ERR(nvme_thread
) : -EINTR
;
2665 result
= nvme_setup_io_queues(dev
);
2666 if (result
&& result
!= -EBUSY
)
2672 nvme_disable_queue(dev
, 0);
2673 nvme_dev_list_remove(dev
);
2675 nvme_dev_unmap(dev
);
2679 static int nvme_remove_dead_ctrl(void *arg
)
2681 struct nvme_dev
*dev
= (struct nvme_dev
*)arg
;
2682 struct pci_dev
*pdev
= dev
->pci_dev
;
2684 if (pci_get_drvdata(pdev
))
2685 pci_stop_and_remove_bus_device(pdev
);
2686 kref_put(&dev
->kref
, nvme_free_dev
);
2690 static void nvme_remove_disks(struct work_struct
*ws
)
2692 struct nvme_dev
*dev
= container_of(ws
, struct nvme_dev
, reset_work
);
2694 nvme_dev_remove(dev
);
2695 nvme_free_queues(dev
, 1);
2698 static int nvme_dev_resume(struct nvme_dev
*dev
)
2702 ret
= nvme_dev_start(dev
);
2703 if (ret
&& ret
!= -EBUSY
)
2705 if (ret
== -EBUSY
) {
2706 spin_lock(&dev_list_lock
);
2707 dev
->reset_workfn
= nvme_remove_disks
;
2708 queue_work(nvme_workq
, &dev
->reset_work
);
2709 spin_unlock(&dev_list_lock
);
2711 dev
->initialized
= 1;
2715 static void nvme_dev_reset(struct nvme_dev
*dev
)
2717 nvme_dev_shutdown(dev
);
2718 if (nvme_dev_resume(dev
)) {
2719 dev_err(&dev
->pci_dev
->dev
, "Device failed to resume\n");
2720 kref_get(&dev
->kref
);
2721 if (IS_ERR(kthread_run(nvme_remove_dead_ctrl
, dev
, "nvme%d",
2723 dev_err(&dev
->pci_dev
->dev
,
2724 "Failed to start controller remove task\n");
2725 kref_put(&dev
->kref
, nvme_free_dev
);
2730 static void nvme_reset_failed_dev(struct work_struct
*ws
)
2732 struct nvme_dev
*dev
= container_of(ws
, struct nvme_dev
, reset_work
);
2733 nvme_dev_reset(dev
);
2736 static void nvme_reset_workfn(struct work_struct
*work
)
2738 struct nvme_dev
*dev
= container_of(work
, struct nvme_dev
, reset_work
);
2739 dev
->reset_workfn(work
);
2742 static int nvme_probe(struct pci_dev
*pdev
, const struct pci_device_id
*id
)
2744 int result
= -ENOMEM
;
2745 struct nvme_dev
*dev
;
2747 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
2750 dev
->entry
= kcalloc(num_possible_cpus(), sizeof(*dev
->entry
),
2754 dev
->queues
= kcalloc(num_possible_cpus() + 1, sizeof(void *),
2758 dev
->io_queue
= alloc_percpu(unsigned short);
2762 INIT_LIST_HEAD(&dev
->namespaces
);
2763 dev
->reset_workfn
= nvme_reset_failed_dev
;
2764 INIT_WORK(&dev
->reset_work
, nvme_reset_workfn
);
2765 dev
->pci_dev
= pdev
;
2766 pci_set_drvdata(pdev
, dev
);
2767 result
= nvme_set_instance(dev
);
2771 result
= nvme_setup_prp_pools(dev
);
2775 kref_init(&dev
->kref
);
2776 result
= nvme_dev_start(dev
);
2778 if (result
== -EBUSY
)
2783 result
= nvme_dev_add(dev
);
2788 scnprintf(dev
->name
, sizeof(dev
->name
), "nvme%d", dev
->instance
);
2789 dev
->miscdev
.minor
= MISC_DYNAMIC_MINOR
;
2790 dev
->miscdev
.parent
= &pdev
->dev
;
2791 dev
->miscdev
.name
= dev
->name
;
2792 dev
->miscdev
.fops
= &nvme_dev_fops
;
2793 result
= misc_register(&dev
->miscdev
);
2797 dev
->initialized
= 1;
2801 nvme_dev_remove(dev
);
2802 nvme_free_namespaces(dev
);
2804 nvme_dev_shutdown(dev
);
2806 nvme_free_queues(dev
, 0);
2807 nvme_release_prp_pools(dev
);
2809 nvme_release_instance(dev
);
2811 free_percpu(dev
->io_queue
);
2818 static void nvme_shutdown(struct pci_dev
*pdev
)
2820 struct nvme_dev
*dev
= pci_get_drvdata(pdev
);
2821 nvme_dev_shutdown(dev
);
2824 static void nvme_remove(struct pci_dev
*pdev
)
2826 struct nvme_dev
*dev
= pci_get_drvdata(pdev
);
2828 spin_lock(&dev_list_lock
);
2829 list_del_init(&dev
->node
);
2830 spin_unlock(&dev_list_lock
);
2832 pci_set_drvdata(pdev
, NULL
);
2833 flush_work(&dev
->reset_work
);
2834 misc_deregister(&dev
->miscdev
);
2835 nvme_dev_remove(dev
);
2836 nvme_dev_shutdown(dev
);
2837 nvme_free_queues(dev
, 0);
2839 nvme_release_instance(dev
);
2840 nvme_release_prp_pools(dev
);
2841 kref_put(&dev
->kref
, nvme_free_dev
);
2844 /* These functions are yet to be implemented */
2845 #define nvme_error_detected NULL
2846 #define nvme_dump_registers NULL
2847 #define nvme_link_reset NULL
2848 #define nvme_slot_reset NULL
2849 #define nvme_error_resume NULL
2851 #ifdef CONFIG_PM_SLEEP
2852 static int nvme_suspend(struct device
*dev
)
2854 struct pci_dev
*pdev
= to_pci_dev(dev
);
2855 struct nvme_dev
*ndev
= pci_get_drvdata(pdev
);
2857 nvme_dev_shutdown(ndev
);
2861 static int nvme_resume(struct device
*dev
)
2863 struct pci_dev
*pdev
= to_pci_dev(dev
);
2864 struct nvme_dev
*ndev
= pci_get_drvdata(pdev
);
2866 if (nvme_dev_resume(ndev
) && !work_busy(&ndev
->reset_work
)) {
2867 ndev
->reset_workfn
= nvme_reset_failed_dev
;
2868 queue_work(nvme_workq
, &ndev
->reset_work
);
2874 static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops
, nvme_suspend
, nvme_resume
);
2876 static const struct pci_error_handlers nvme_err_handler
= {
2877 .error_detected
= nvme_error_detected
,
2878 .mmio_enabled
= nvme_dump_registers
,
2879 .link_reset
= nvme_link_reset
,
2880 .slot_reset
= nvme_slot_reset
,
2881 .resume
= nvme_error_resume
,
2884 /* Move to pci_ids.h later */
2885 #define PCI_CLASS_STORAGE_EXPRESS 0x010802
2887 static const struct pci_device_id nvme_id_table
[] = {
2888 { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS
, 0xffffff) },
2891 MODULE_DEVICE_TABLE(pci
, nvme_id_table
);
2893 static struct pci_driver nvme_driver
= {
2895 .id_table
= nvme_id_table
,
2896 .probe
= nvme_probe
,
2897 .remove
= nvme_remove
,
2898 .shutdown
= nvme_shutdown
,
2900 .pm
= &nvme_dev_pm_ops
,
2902 .err_handler
= &nvme_err_handler
,
2905 static int __init
nvme_init(void)
2909 init_waitqueue_head(&nvme_kthread_wait
);
2911 nvme_workq
= create_singlethread_workqueue("nvme");
2915 result
= register_blkdev(nvme_major
, "nvme");
2918 else if (result
> 0)
2919 nvme_major
= result
;
2921 result
= pci_register_driver(&nvme_driver
);
2923 goto unregister_blkdev
;
2927 unregister_blkdev(nvme_major
, "nvme");
2929 destroy_workqueue(nvme_workq
);
2933 static void __exit
nvme_exit(void)
2935 pci_unregister_driver(&nvme_driver
);
2936 unregister_blkdev(nvme_major
, "nvme");
2937 destroy_workqueue(nvme_workq
);
2938 BUG_ON(nvme_thread
&& !IS_ERR(nvme_thread
));
2942 MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>");
2943 MODULE_LICENSE("GPL");
2944 MODULE_VERSION("0.9");
2945 module_init(nvme_init
);
2946 module_exit(nvme_exit
);