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)
210 #define CMD_CTX_ASYNC (0x31C + CMD_CTX_BASE)
212 static void special_completion(struct nvme_queue
*nvmeq
, void *ctx
,
213 struct nvme_completion
*cqe
)
215 if (ctx
== CMD_CTX_CANCELLED
)
217 if (ctx
== CMD_CTX_ABORT
) {
218 ++nvmeq
->dev
->abort_limit
;
221 if (ctx
== CMD_CTX_COMPLETED
) {
222 dev_warn(nvmeq
->q_dmadev
,
223 "completed id %d twice on queue %d\n",
224 cqe
->command_id
, le16_to_cpup(&cqe
->sq_id
));
227 if (ctx
== CMD_CTX_INVALID
) {
228 dev_warn(nvmeq
->q_dmadev
,
229 "invalid id %d completed on queue %d\n",
230 cqe
->command_id
, le16_to_cpup(&cqe
->sq_id
));
233 if (ctx
== CMD_CTX_ASYNC
) {
234 u32 result
= le32_to_cpup(&cqe
->result
);
235 u16 status
= le16_to_cpup(&cqe
->status
) >> 1;
237 if (status
== NVME_SC_SUCCESS
|| status
== NVME_SC_ABORT_REQ
)
238 ++nvmeq
->dev
->event_limit
;
239 if (status
== NVME_SC_SUCCESS
)
240 dev_warn(nvmeq
->q_dmadev
,
241 "async event result %08x\n", result
);
245 dev_warn(nvmeq
->q_dmadev
, "Unknown special completion %p\n", ctx
);
248 static void async_completion(struct nvme_queue
*nvmeq
, void *ctx
,
249 struct nvme_completion
*cqe
)
251 struct async_cmd_info
*cmdinfo
= ctx
;
252 cmdinfo
->result
= le32_to_cpup(&cqe
->result
);
253 cmdinfo
->status
= le16_to_cpup(&cqe
->status
) >> 1;
254 queue_kthread_work(cmdinfo
->worker
, &cmdinfo
->work
);
258 * Called with local interrupts disabled and the q_lock held. May not sleep.
260 static void *free_cmdid(struct nvme_queue
*nvmeq
, int cmdid
,
261 nvme_completion_fn
*fn
)
264 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
266 if (cmdid
>= nvmeq
->q_depth
|| !info
[cmdid
].fn
) {
268 *fn
= special_completion
;
269 return CMD_CTX_INVALID
;
272 *fn
= info
[cmdid
].fn
;
273 ctx
= info
[cmdid
].ctx
;
274 info
[cmdid
].fn
= special_completion
;
275 info
[cmdid
].ctx
= CMD_CTX_COMPLETED
;
276 clear_bit(cmdid
, nvmeq
->cmdid_data
);
277 wake_up(&nvmeq
->sq_full
);
281 static void *cancel_cmdid(struct nvme_queue
*nvmeq
, int cmdid
,
282 nvme_completion_fn
*fn
)
285 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
287 *fn
= info
[cmdid
].fn
;
288 ctx
= info
[cmdid
].ctx
;
289 info
[cmdid
].fn
= special_completion
;
290 info
[cmdid
].ctx
= CMD_CTX_CANCELLED
;
294 static struct nvme_queue
*raw_nvmeq(struct nvme_dev
*dev
, int qid
)
296 return rcu_dereference_raw(dev
->queues
[qid
]);
299 static struct nvme_queue
*get_nvmeq(struct nvme_dev
*dev
) __acquires(RCU
)
301 struct nvme_queue
*nvmeq
;
302 unsigned queue_id
= get_cpu_var(*dev
->io_queue
);
305 nvmeq
= rcu_dereference(dev
->queues
[queue_id
]);
310 put_cpu_var(*dev
->io_queue
);
314 static void put_nvmeq(struct nvme_queue
*nvmeq
) __releases(RCU
)
317 put_cpu_var(nvmeq
->dev
->io_queue
);
320 static struct nvme_queue
*lock_nvmeq(struct nvme_dev
*dev
, int q_idx
)
323 struct nvme_queue
*nvmeq
;
326 nvmeq
= rcu_dereference(dev
->queues
[q_idx
]);
334 static void unlock_nvmeq(struct nvme_queue
*nvmeq
) __releases(RCU
)
340 * nvme_submit_cmd() - Copy a command into a queue and ring the doorbell
341 * @nvmeq: The queue to use
342 * @cmd: The command to send
344 * Safe to use from interrupt context
346 static int nvme_submit_cmd(struct nvme_queue
*nvmeq
, struct nvme_command
*cmd
)
350 spin_lock_irqsave(&nvmeq
->q_lock
, flags
);
351 if (nvmeq
->q_suspended
) {
352 spin_unlock_irqrestore(&nvmeq
->q_lock
, flags
);
355 tail
= nvmeq
->sq_tail
;
356 memcpy(&nvmeq
->sq_cmds
[tail
], cmd
, sizeof(*cmd
));
357 if (++tail
== nvmeq
->q_depth
)
359 writel(tail
, nvmeq
->q_db
);
360 nvmeq
->sq_tail
= tail
;
361 spin_unlock_irqrestore(&nvmeq
->q_lock
, flags
);
366 static __le64
**iod_list(struct nvme_iod
*iod
)
368 return ((void *)iod
) + iod
->offset
;
372 * Will slightly overestimate the number of pages needed. This is OK
373 * as it only leads to a small amount of wasted memory for the lifetime of
376 static int nvme_npages(unsigned size
, struct nvme_dev
*dev
)
378 unsigned nprps
= DIV_ROUND_UP(size
+ dev
->page_size
, dev
->page_size
);
379 return DIV_ROUND_UP(8 * nprps
, dev
->page_size
- 8);
382 static struct nvme_iod
*
383 nvme_alloc_iod(unsigned nseg
, unsigned nbytes
, struct nvme_dev
*dev
, gfp_t gfp
)
385 struct nvme_iod
*iod
= kmalloc(sizeof(struct nvme_iod
) +
386 sizeof(__le64
*) * nvme_npages(nbytes
, dev
) +
387 sizeof(struct scatterlist
) * nseg
, gfp
);
390 iod
->offset
= offsetof(struct nvme_iod
, sg
[nseg
]);
392 iod
->length
= nbytes
;
394 iod
->first_dma
= 0ULL;
395 iod
->start_time
= jiffies
;
401 void nvme_free_iod(struct nvme_dev
*dev
, struct nvme_iod
*iod
)
403 const int last_prp
= dev
->page_size
/ 8 - 1;
405 __le64
**list
= iod_list(iod
);
406 dma_addr_t prp_dma
= iod
->first_dma
;
408 if (iod
->npages
== 0)
409 dma_pool_free(dev
->prp_small_pool
, list
[0], prp_dma
);
410 for (i
= 0; i
< iod
->npages
; i
++) {
411 __le64
*prp_list
= list
[i
];
412 dma_addr_t next_prp_dma
= le64_to_cpu(prp_list
[last_prp
]);
413 dma_pool_free(dev
->prp_page_pool
, prp_list
, prp_dma
);
414 prp_dma
= next_prp_dma
;
419 static void nvme_start_io_acct(struct bio
*bio
)
421 struct gendisk
*disk
= bio
->bi_bdev
->bd_disk
;
422 if (blk_queue_io_stat(disk
->queue
)) {
423 const int rw
= bio_data_dir(bio
);
424 int cpu
= part_stat_lock();
425 part_round_stats(cpu
, &disk
->part0
);
426 part_stat_inc(cpu
, &disk
->part0
, ios
[rw
]);
427 part_stat_add(cpu
, &disk
->part0
, sectors
[rw
],
429 part_inc_in_flight(&disk
->part0
, rw
);
434 static void nvme_end_io_acct(struct bio
*bio
, unsigned long start_time
)
436 struct gendisk
*disk
= bio
->bi_bdev
->bd_disk
;
437 if (blk_queue_io_stat(disk
->queue
)) {
438 const int rw
= bio_data_dir(bio
);
439 unsigned long duration
= jiffies
- start_time
;
440 int cpu
= part_stat_lock();
441 part_stat_add(cpu
, &disk
->part0
, ticks
[rw
], duration
);
442 part_round_stats(cpu
, &disk
->part0
);
443 part_dec_in_flight(&disk
->part0
, rw
);
448 static void bio_completion(struct nvme_queue
*nvmeq
, void *ctx
,
449 struct nvme_completion
*cqe
)
451 struct nvme_iod
*iod
= ctx
;
452 struct bio
*bio
= iod
->private;
453 u16 status
= le16_to_cpup(&cqe
->status
) >> 1;
456 if (unlikely(status
)) {
457 if (!(status
& NVME_SC_DNR
||
458 bio
->bi_rw
& REQ_FAILFAST_MASK
) &&
459 (jiffies
- iod
->start_time
) < IOD_TIMEOUT
) {
460 if (!waitqueue_active(&nvmeq
->sq_full
))
461 add_wait_queue(&nvmeq
->sq_full
,
462 &nvmeq
->sq_cong_wait
);
463 list_add_tail(&iod
->node
, &nvmeq
->iod_bio
);
464 wake_up(&nvmeq
->sq_full
);
470 dma_unmap_sg(nvmeq
->q_dmadev
, iod
->sg
, iod
->nents
,
471 bio_data_dir(bio
) ? DMA_TO_DEVICE
: DMA_FROM_DEVICE
);
472 nvme_end_io_acct(bio
, iod
->start_time
);
474 nvme_free_iod(nvmeq
->dev
, iod
);
476 trace_block_bio_complete(bdev_get_queue(bio
->bi_bdev
), bio
, error
);
477 bio_endio(bio
, error
);
480 /* length is in bytes. gfp flags indicates whether we may sleep. */
481 int nvme_setup_prps(struct nvme_dev
*dev
, struct nvme_iod
*iod
, int total_len
,
484 struct dma_pool
*pool
;
485 int length
= total_len
;
486 struct scatterlist
*sg
= iod
->sg
;
487 int dma_len
= sg_dma_len(sg
);
488 u64 dma_addr
= sg_dma_address(sg
);
489 int offset
= offset_in_page(dma_addr
);
491 __le64
**list
= iod_list(iod
);
494 u32 page_size
= dev
->page_size
;
496 length
-= (page_size
- offset
);
500 dma_len
-= (page_size
- offset
);
502 dma_addr
+= (page_size
- offset
);
505 dma_addr
= sg_dma_address(sg
);
506 dma_len
= sg_dma_len(sg
);
509 if (length
<= page_size
) {
510 iod
->first_dma
= dma_addr
;
514 nprps
= DIV_ROUND_UP(length
, page_size
);
515 if (nprps
<= (256 / 8)) {
516 pool
= dev
->prp_small_pool
;
519 pool
= dev
->prp_page_pool
;
523 prp_list
= dma_pool_alloc(pool
, gfp
, &prp_dma
);
525 iod
->first_dma
= dma_addr
;
527 return (total_len
- length
) + page_size
;
530 iod
->first_dma
= prp_dma
;
533 if (i
== page_size
>> 3) {
534 __le64
*old_prp_list
= prp_list
;
535 prp_list
= dma_pool_alloc(pool
, gfp
, &prp_dma
);
537 return total_len
- length
;
538 list
[iod
->npages
++] = prp_list
;
539 prp_list
[0] = old_prp_list
[i
- 1];
540 old_prp_list
[i
- 1] = cpu_to_le64(prp_dma
);
543 prp_list
[i
++] = cpu_to_le64(dma_addr
);
544 dma_len
-= page_size
;
545 dma_addr
+= page_size
;
553 dma_addr
= sg_dma_address(sg
);
554 dma_len
= sg_dma_len(sg
);
560 static int nvme_split_and_submit(struct bio
*bio
, struct nvme_queue
*nvmeq
,
563 struct bio
*split
= bio_split(bio
, len
>> 9, GFP_ATOMIC
, NULL
);
567 trace_block_split(bdev_get_queue(bio
->bi_bdev
), bio
,
568 split
->bi_iter
.bi_sector
);
569 bio_chain(split
, bio
);
571 if (!waitqueue_active(&nvmeq
->sq_full
))
572 add_wait_queue(&nvmeq
->sq_full
, &nvmeq
->sq_cong_wait
);
573 bio_list_add(&nvmeq
->sq_cong
, split
);
574 bio_list_add(&nvmeq
->sq_cong
, bio
);
575 wake_up(&nvmeq
->sq_full
);
580 /* NVMe scatterlists require no holes in the virtual address */
581 #define BIOVEC_NOT_VIRT_MERGEABLE(vec1, vec2) ((vec2)->bv_offset || \
582 (((vec1)->bv_offset + (vec1)->bv_len) % PAGE_SIZE))
584 static int nvme_map_bio(struct nvme_queue
*nvmeq
, struct nvme_iod
*iod
,
585 struct bio
*bio
, enum dma_data_direction dma_dir
, int psegs
)
587 struct bio_vec bvec
, bvprv
;
588 struct bvec_iter iter
;
589 struct scatterlist
*sg
= NULL
;
590 int length
= 0, nsegs
= 0, split_len
= bio
->bi_iter
.bi_size
;
593 if (nvmeq
->dev
->stripe_size
)
594 split_len
= nvmeq
->dev
->stripe_size
-
595 ((bio
->bi_iter
.bi_sector
<< 9) &
596 (nvmeq
->dev
->stripe_size
- 1));
598 sg_init_table(iod
->sg
, psegs
);
599 bio_for_each_segment(bvec
, bio
, iter
) {
600 if (!first
&& BIOVEC_PHYS_MERGEABLE(&bvprv
, &bvec
)) {
601 sg
->length
+= bvec
.bv_len
;
603 if (!first
&& BIOVEC_NOT_VIRT_MERGEABLE(&bvprv
, &bvec
))
604 return nvme_split_and_submit(bio
, nvmeq
,
607 sg
= sg
? sg
+ 1 : iod
->sg
;
608 sg_set_page(sg
, bvec
.bv_page
,
609 bvec
.bv_len
, bvec
.bv_offset
);
613 if (split_len
- length
< bvec
.bv_len
)
614 return nvme_split_and_submit(bio
, nvmeq
, split_len
);
615 length
+= bvec
.bv_len
;
621 if (dma_map_sg(nvmeq
->q_dmadev
, iod
->sg
, iod
->nents
, dma_dir
) == 0)
624 BUG_ON(length
!= bio
->bi_iter
.bi_size
);
628 static int nvme_submit_discard(struct nvme_queue
*nvmeq
, struct nvme_ns
*ns
,
629 struct bio
*bio
, struct nvme_iod
*iod
, int cmdid
)
631 struct nvme_dsm_range
*range
=
632 (struct nvme_dsm_range
*)iod_list(iod
)[0];
633 struct nvme_command
*cmnd
= &nvmeq
->sq_cmds
[nvmeq
->sq_tail
];
635 range
->cattr
= cpu_to_le32(0);
636 range
->nlb
= cpu_to_le32(bio
->bi_iter
.bi_size
>> ns
->lba_shift
);
637 range
->slba
= cpu_to_le64(nvme_block_nr(ns
, bio
->bi_iter
.bi_sector
));
639 memset(cmnd
, 0, sizeof(*cmnd
));
640 cmnd
->dsm
.opcode
= nvme_cmd_dsm
;
641 cmnd
->dsm
.command_id
= cmdid
;
642 cmnd
->dsm
.nsid
= cpu_to_le32(ns
->ns_id
);
643 cmnd
->dsm
.prp1
= cpu_to_le64(iod
->first_dma
);
645 cmnd
->dsm
.attributes
= cpu_to_le32(NVME_DSMGMT_AD
);
647 if (++nvmeq
->sq_tail
== nvmeq
->q_depth
)
649 writel(nvmeq
->sq_tail
, nvmeq
->q_db
);
654 static int nvme_submit_flush(struct nvme_queue
*nvmeq
, struct nvme_ns
*ns
,
657 struct nvme_command
*cmnd
= &nvmeq
->sq_cmds
[nvmeq
->sq_tail
];
659 memset(cmnd
, 0, sizeof(*cmnd
));
660 cmnd
->common
.opcode
= nvme_cmd_flush
;
661 cmnd
->common
.command_id
= cmdid
;
662 cmnd
->common
.nsid
= cpu_to_le32(ns
->ns_id
);
664 if (++nvmeq
->sq_tail
== nvmeq
->q_depth
)
666 writel(nvmeq
->sq_tail
, nvmeq
->q_db
);
671 static int nvme_submit_iod(struct nvme_queue
*nvmeq
, struct nvme_iod
*iod
)
673 struct bio
*bio
= iod
->private;
674 struct nvme_ns
*ns
= bio
->bi_bdev
->bd_disk
->private_data
;
675 struct nvme_command
*cmnd
;
680 cmdid
= alloc_cmdid(nvmeq
, iod
, bio_completion
, NVME_IO_TIMEOUT
);
681 if (unlikely(cmdid
< 0))
684 if (bio
->bi_rw
& REQ_DISCARD
)
685 return nvme_submit_discard(nvmeq
, ns
, bio
, iod
, cmdid
);
686 if (bio
->bi_rw
& REQ_FLUSH
)
687 return nvme_submit_flush(nvmeq
, ns
, cmdid
);
690 if (bio
->bi_rw
& REQ_FUA
)
691 control
|= NVME_RW_FUA
;
692 if (bio
->bi_rw
& (REQ_FAILFAST_DEV
| REQ_RAHEAD
))
693 control
|= NVME_RW_LR
;
696 if (bio
->bi_rw
& REQ_RAHEAD
)
697 dsmgmt
|= NVME_RW_DSM_FREQ_PREFETCH
;
699 cmnd
= &nvmeq
->sq_cmds
[nvmeq
->sq_tail
];
700 memset(cmnd
, 0, sizeof(*cmnd
));
702 cmnd
->rw
.opcode
= bio_data_dir(bio
) ? nvme_cmd_write
: nvme_cmd_read
;
703 cmnd
->rw
.command_id
= cmdid
;
704 cmnd
->rw
.nsid
= cpu_to_le32(ns
->ns_id
);
705 cmnd
->rw
.prp1
= cpu_to_le64(sg_dma_address(iod
->sg
));
706 cmnd
->rw
.prp2
= cpu_to_le64(iod
->first_dma
);
707 cmnd
->rw
.slba
= cpu_to_le64(nvme_block_nr(ns
, bio
->bi_iter
.bi_sector
));
709 cpu_to_le16((bio
->bi_iter
.bi_size
>> ns
->lba_shift
) - 1);
710 cmnd
->rw
.control
= cpu_to_le16(control
);
711 cmnd
->rw
.dsmgmt
= cpu_to_le32(dsmgmt
);
713 if (++nvmeq
->sq_tail
== nvmeq
->q_depth
)
715 writel(nvmeq
->sq_tail
, nvmeq
->q_db
);
720 static int nvme_split_flush_data(struct nvme_queue
*nvmeq
, struct bio
*bio
)
722 struct bio
*split
= bio_clone(bio
, GFP_ATOMIC
);
726 split
->bi_iter
.bi_size
= 0;
727 split
->bi_phys_segments
= 0;
728 bio
->bi_rw
&= ~REQ_FLUSH
;
729 bio_chain(split
, bio
);
731 if (!waitqueue_active(&nvmeq
->sq_full
))
732 add_wait_queue(&nvmeq
->sq_full
, &nvmeq
->sq_cong_wait
);
733 bio_list_add(&nvmeq
->sq_cong
, split
);
734 bio_list_add(&nvmeq
->sq_cong
, bio
);
735 wake_up_process(nvme_thread
);
741 * Called with local interrupts disabled and the q_lock held. May not sleep.
743 static int nvme_submit_bio_queue(struct nvme_queue
*nvmeq
, struct nvme_ns
*ns
,
746 struct nvme_iod
*iod
;
747 int psegs
= bio_phys_segments(ns
->queue
, bio
);
750 if ((bio
->bi_rw
& REQ_FLUSH
) && psegs
)
751 return nvme_split_flush_data(nvmeq
, bio
);
753 iod
= nvme_alloc_iod(psegs
, bio
->bi_iter
.bi_size
, ns
->dev
, GFP_ATOMIC
);
758 if (bio
->bi_rw
& REQ_DISCARD
) {
761 * We reuse the small pool to allocate the 16-byte range here
762 * as it is not worth having a special pool for these or
763 * additional cases to handle freeing the iod.
765 range
= dma_pool_alloc(nvmeq
->dev
->prp_small_pool
,
772 iod_list(iod
)[0] = (__le64
*)range
;
775 result
= nvme_map_bio(nvmeq
, iod
, bio
,
776 bio_data_dir(bio
) ? DMA_TO_DEVICE
: DMA_FROM_DEVICE
,
780 if (nvme_setup_prps(nvmeq
->dev
, iod
, result
, GFP_ATOMIC
) !=
785 nvme_start_io_acct(bio
);
787 if (unlikely(nvme_submit_iod(nvmeq
, iod
))) {
788 if (!waitqueue_active(&nvmeq
->sq_full
))
789 add_wait_queue(&nvmeq
->sq_full
, &nvmeq
->sq_cong_wait
);
790 list_add_tail(&iod
->node
, &nvmeq
->iod_bio
);
795 nvme_free_iod(nvmeq
->dev
, iod
);
799 static int nvme_process_cq(struct nvme_queue
*nvmeq
)
803 head
= nvmeq
->cq_head
;
804 phase
= nvmeq
->cq_phase
;
808 nvme_completion_fn fn
;
809 struct nvme_completion cqe
= nvmeq
->cqes
[head
];
810 if ((le16_to_cpu(cqe
.status
) & 1) != phase
)
812 nvmeq
->sq_head
= le16_to_cpu(cqe
.sq_head
);
813 if (++head
== nvmeq
->q_depth
) {
818 ctx
= free_cmdid(nvmeq
, cqe
.command_id
, &fn
);
819 fn(nvmeq
, ctx
, &cqe
);
822 /* If the controller ignores the cq head doorbell and continuously
823 * writes to the queue, it is theoretically possible to wrap around
824 * the queue twice and mistakenly return IRQ_NONE. Linux only
825 * requires that 0.1% of your interrupts are handled, so this isn't
828 if (head
== nvmeq
->cq_head
&& phase
== nvmeq
->cq_phase
)
831 writel(head
, nvmeq
->q_db
+ nvmeq
->dev
->db_stride
);
832 nvmeq
->cq_head
= head
;
833 nvmeq
->cq_phase
= phase
;
839 static void nvme_make_request(struct request_queue
*q
, struct bio
*bio
)
841 struct nvme_ns
*ns
= q
->queuedata
;
842 struct nvme_queue
*nvmeq
= get_nvmeq(ns
->dev
);
846 bio_endio(bio
, -EIO
);
850 spin_lock_irq(&nvmeq
->q_lock
);
851 if (!nvmeq
->q_suspended
&& bio_list_empty(&nvmeq
->sq_cong
))
852 result
= nvme_submit_bio_queue(nvmeq
, ns
, bio
);
853 if (unlikely(result
)) {
854 if (!waitqueue_active(&nvmeq
->sq_full
))
855 add_wait_queue(&nvmeq
->sq_full
, &nvmeq
->sq_cong_wait
);
856 bio_list_add(&nvmeq
->sq_cong
, bio
);
859 nvme_process_cq(nvmeq
);
860 spin_unlock_irq(&nvmeq
->q_lock
);
864 static irqreturn_t
nvme_irq(int irq
, void *data
)
867 struct nvme_queue
*nvmeq
= data
;
868 spin_lock(&nvmeq
->q_lock
);
869 nvme_process_cq(nvmeq
);
870 result
= nvmeq
->cqe_seen
? IRQ_HANDLED
: IRQ_NONE
;
872 spin_unlock(&nvmeq
->q_lock
);
876 static irqreturn_t
nvme_irq_check(int irq
, void *data
)
878 struct nvme_queue
*nvmeq
= data
;
879 struct nvme_completion cqe
= nvmeq
->cqes
[nvmeq
->cq_head
];
880 if ((le16_to_cpu(cqe
.status
) & 1) != nvmeq
->cq_phase
)
882 return IRQ_WAKE_THREAD
;
885 static void nvme_abort_command(struct nvme_queue
*nvmeq
, int cmdid
)
887 spin_lock_irq(&nvmeq
->q_lock
);
888 cancel_cmdid(nvmeq
, cmdid
, NULL
);
889 spin_unlock_irq(&nvmeq
->q_lock
);
892 struct sync_cmd_info
{
893 struct task_struct
*task
;
898 static void sync_completion(struct nvme_queue
*nvmeq
, void *ctx
,
899 struct nvme_completion
*cqe
)
901 struct sync_cmd_info
*cmdinfo
= ctx
;
902 cmdinfo
->result
= le32_to_cpup(&cqe
->result
);
903 cmdinfo
->status
= le16_to_cpup(&cqe
->status
) >> 1;
904 wake_up_process(cmdinfo
->task
);
908 * Returns 0 on success. If the result is negative, it's a Linux error code;
909 * if the result is positive, it's an NVM Express status code
911 static int nvme_submit_sync_cmd(struct nvme_dev
*dev
, int q_idx
,
912 struct nvme_command
*cmd
,
913 u32
*result
, unsigned timeout
)
916 struct sync_cmd_info cmdinfo
;
917 struct nvme_queue
*nvmeq
;
919 nvmeq
= lock_nvmeq(dev
, q_idx
);
923 cmdinfo
.task
= current
;
924 cmdinfo
.status
= -EINTR
;
926 cmdid
= alloc_cmdid(nvmeq
, &cmdinfo
, sync_completion
, timeout
);
931 cmd
->common
.command_id
= cmdid
;
933 set_current_state(TASK_KILLABLE
);
934 ret
= nvme_submit_cmd(nvmeq
, cmd
);
936 free_cmdid(nvmeq
, cmdid
, NULL
);
938 set_current_state(TASK_RUNNING
);
942 schedule_timeout(timeout
);
944 if (cmdinfo
.status
== -EINTR
) {
945 nvmeq
= lock_nvmeq(dev
, q_idx
);
947 nvme_abort_command(nvmeq
, cmdid
);
954 *result
= cmdinfo
.result
;
956 return cmdinfo
.status
;
959 static int nvme_submit_async_cmd(struct nvme_queue
*nvmeq
,
960 struct nvme_command
*cmd
,
961 struct async_cmd_info
*cmdinfo
, unsigned timeout
)
965 cmdid
= alloc_cmdid_killable(nvmeq
, cmdinfo
, async_completion
, timeout
);
968 cmdinfo
->status
= -EINTR
;
969 cmd
->common
.command_id
= cmdid
;
970 return nvme_submit_cmd(nvmeq
, cmd
);
973 int nvme_submit_admin_cmd(struct nvme_dev
*dev
, struct nvme_command
*cmd
,
976 return nvme_submit_sync_cmd(dev
, 0, cmd
, result
, ADMIN_TIMEOUT
);
979 int nvme_submit_io_cmd(struct nvme_dev
*dev
, struct nvme_command
*cmd
,
982 return nvme_submit_sync_cmd(dev
, smp_processor_id() + 1, cmd
, result
,
986 static int nvme_submit_admin_cmd_async(struct nvme_dev
*dev
,
987 struct nvme_command
*cmd
, struct async_cmd_info
*cmdinfo
)
989 return nvme_submit_async_cmd(raw_nvmeq(dev
, 0), cmd
, cmdinfo
,
993 static int adapter_delete_queue(struct nvme_dev
*dev
, u8 opcode
, u16 id
)
996 struct nvme_command c
;
998 memset(&c
, 0, sizeof(c
));
999 c
.delete_queue
.opcode
= opcode
;
1000 c
.delete_queue
.qid
= cpu_to_le16(id
);
1002 status
= nvme_submit_admin_cmd(dev
, &c
, NULL
);
1008 static int adapter_alloc_cq(struct nvme_dev
*dev
, u16 qid
,
1009 struct nvme_queue
*nvmeq
)
1012 struct nvme_command c
;
1013 int flags
= NVME_QUEUE_PHYS_CONTIG
| NVME_CQ_IRQ_ENABLED
;
1015 memset(&c
, 0, sizeof(c
));
1016 c
.create_cq
.opcode
= nvme_admin_create_cq
;
1017 c
.create_cq
.prp1
= cpu_to_le64(nvmeq
->cq_dma_addr
);
1018 c
.create_cq
.cqid
= cpu_to_le16(qid
);
1019 c
.create_cq
.qsize
= cpu_to_le16(nvmeq
->q_depth
- 1);
1020 c
.create_cq
.cq_flags
= cpu_to_le16(flags
);
1021 c
.create_cq
.irq_vector
= cpu_to_le16(nvmeq
->cq_vector
);
1023 status
= nvme_submit_admin_cmd(dev
, &c
, NULL
);
1029 static int adapter_alloc_sq(struct nvme_dev
*dev
, u16 qid
,
1030 struct nvme_queue
*nvmeq
)
1033 struct nvme_command c
;
1034 int flags
= NVME_QUEUE_PHYS_CONTIG
| NVME_SQ_PRIO_MEDIUM
;
1036 memset(&c
, 0, sizeof(c
));
1037 c
.create_sq
.opcode
= nvme_admin_create_sq
;
1038 c
.create_sq
.prp1
= cpu_to_le64(nvmeq
->sq_dma_addr
);
1039 c
.create_sq
.sqid
= cpu_to_le16(qid
);
1040 c
.create_sq
.qsize
= cpu_to_le16(nvmeq
->q_depth
- 1);
1041 c
.create_sq
.sq_flags
= cpu_to_le16(flags
);
1042 c
.create_sq
.cqid
= cpu_to_le16(qid
);
1044 status
= nvme_submit_admin_cmd(dev
, &c
, NULL
);
1050 static int adapter_delete_cq(struct nvme_dev
*dev
, u16 cqid
)
1052 return adapter_delete_queue(dev
, nvme_admin_delete_cq
, cqid
);
1055 static int adapter_delete_sq(struct nvme_dev
*dev
, u16 sqid
)
1057 return adapter_delete_queue(dev
, nvme_admin_delete_sq
, sqid
);
1060 int nvme_identify(struct nvme_dev
*dev
, unsigned nsid
, unsigned cns
,
1061 dma_addr_t dma_addr
)
1063 struct nvme_command c
;
1065 memset(&c
, 0, sizeof(c
));
1066 c
.identify
.opcode
= nvme_admin_identify
;
1067 c
.identify
.nsid
= cpu_to_le32(nsid
);
1068 c
.identify
.prp1
= cpu_to_le64(dma_addr
);
1069 c
.identify
.cns
= cpu_to_le32(cns
);
1071 return nvme_submit_admin_cmd(dev
, &c
, NULL
);
1074 int nvme_get_features(struct nvme_dev
*dev
, unsigned fid
, unsigned nsid
,
1075 dma_addr_t dma_addr
, u32
*result
)
1077 struct nvme_command c
;
1079 memset(&c
, 0, sizeof(c
));
1080 c
.features
.opcode
= nvme_admin_get_features
;
1081 c
.features
.nsid
= cpu_to_le32(nsid
);
1082 c
.features
.prp1
= cpu_to_le64(dma_addr
);
1083 c
.features
.fid
= cpu_to_le32(fid
);
1085 return nvme_submit_admin_cmd(dev
, &c
, result
);
1088 int nvme_set_features(struct nvme_dev
*dev
, unsigned fid
, unsigned dword11
,
1089 dma_addr_t dma_addr
, u32
*result
)
1091 struct nvme_command c
;
1093 memset(&c
, 0, sizeof(c
));
1094 c
.features
.opcode
= nvme_admin_set_features
;
1095 c
.features
.prp1
= cpu_to_le64(dma_addr
);
1096 c
.features
.fid
= cpu_to_le32(fid
);
1097 c
.features
.dword11
= cpu_to_le32(dword11
);
1099 return nvme_submit_admin_cmd(dev
, &c
, result
);
1103 * nvme_abort_cmd - Attempt aborting a command
1104 * @cmdid: Command id of a timed out IO
1105 * @queue: The queue with timed out IO
1107 * Schedule controller reset if the command was already aborted once before and
1108 * still hasn't been returned to the driver, or if this is the admin queue.
1110 static void nvme_abort_cmd(int cmdid
, struct nvme_queue
*nvmeq
)
1113 struct nvme_command cmd
;
1114 struct nvme_dev
*dev
= nvmeq
->dev
;
1115 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
1116 struct nvme_queue
*adminq
;
1118 if (!nvmeq
->qid
|| info
[cmdid
].aborted
) {
1119 if (work_busy(&dev
->reset_work
))
1121 list_del_init(&dev
->node
);
1122 dev_warn(&dev
->pci_dev
->dev
,
1123 "I/O %d QID %d timeout, reset controller\n", cmdid
,
1125 dev
->reset_workfn
= nvme_reset_failed_dev
;
1126 queue_work(nvme_workq
, &dev
->reset_work
);
1130 if (!dev
->abort_limit
)
1133 adminq
= rcu_dereference(dev
->queues
[0]);
1134 a_cmdid
= alloc_cmdid(adminq
, CMD_CTX_ABORT
, special_completion
,
1139 memset(&cmd
, 0, sizeof(cmd
));
1140 cmd
.abort
.opcode
= nvme_admin_abort_cmd
;
1141 cmd
.abort
.cid
= cmdid
;
1142 cmd
.abort
.sqid
= cpu_to_le16(nvmeq
->qid
);
1143 cmd
.abort
.command_id
= a_cmdid
;
1146 info
[cmdid
].aborted
= 1;
1147 info
[cmdid
].timeout
= jiffies
+ ADMIN_TIMEOUT
;
1149 dev_warn(nvmeq
->q_dmadev
, "Aborting I/O %d QID %d\n", cmdid
,
1151 nvme_submit_cmd(adminq
, &cmd
);
1155 * nvme_cancel_ios - Cancel outstanding I/Os
1156 * @queue: The queue to cancel I/Os on
1157 * @timeout: True to only cancel I/Os which have timed out
1159 static void nvme_cancel_ios(struct nvme_queue
*nvmeq
, bool timeout
)
1161 int depth
= nvmeq
->q_depth
- 1;
1162 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
1163 unsigned long now
= jiffies
;
1166 for_each_set_bit(cmdid
, nvmeq
->cmdid_data
, depth
) {
1168 nvme_completion_fn fn
;
1169 static struct nvme_completion cqe
= {
1170 .status
= cpu_to_le16(NVME_SC_ABORT_REQ
<< 1),
1173 if (timeout
&& !time_after(now
, info
[cmdid
].timeout
))
1175 if (info
[cmdid
].ctx
== CMD_CTX_CANCELLED
)
1177 if (timeout
&& info
[cmdid
].ctx
== CMD_CTX_ASYNC
)
1179 if (timeout
&& nvmeq
->dev
->initialized
) {
1180 nvme_abort_cmd(cmdid
, nvmeq
);
1183 dev_warn(nvmeq
->q_dmadev
, "Cancelling I/O %d QID %d\n", cmdid
,
1185 ctx
= cancel_cmdid(nvmeq
, cmdid
, &fn
);
1186 fn(nvmeq
, ctx
, &cqe
);
1190 static void nvme_free_queue(struct rcu_head
*r
)
1192 struct nvme_queue
*nvmeq
= container_of(r
, struct nvme_queue
, r_head
);
1194 spin_lock_irq(&nvmeq
->q_lock
);
1195 while (bio_list_peek(&nvmeq
->sq_cong
)) {
1196 struct bio
*bio
= bio_list_pop(&nvmeq
->sq_cong
);
1197 bio_endio(bio
, -EIO
);
1199 while (!list_empty(&nvmeq
->iod_bio
)) {
1200 static struct nvme_completion cqe
= {
1201 .status
= cpu_to_le16(
1202 (NVME_SC_ABORT_REQ
| NVME_SC_DNR
) << 1),
1204 struct nvme_iod
*iod
= list_first_entry(&nvmeq
->iod_bio
,
1207 list_del(&iod
->node
);
1208 bio_completion(nvmeq
, iod
, &cqe
);
1210 spin_unlock_irq(&nvmeq
->q_lock
);
1212 dma_free_coherent(nvmeq
->q_dmadev
, CQ_SIZE(nvmeq
->q_depth
),
1213 (void *)nvmeq
->cqes
, nvmeq
->cq_dma_addr
);
1214 dma_free_coherent(nvmeq
->q_dmadev
, SQ_SIZE(nvmeq
->q_depth
),
1215 nvmeq
->sq_cmds
, nvmeq
->sq_dma_addr
);
1217 free_cpumask_var(nvmeq
->cpu_mask
);
1221 static void nvme_free_queues(struct nvme_dev
*dev
, int lowest
)
1225 for (i
= dev
->queue_count
- 1; i
>= lowest
; i
--) {
1226 struct nvme_queue
*nvmeq
= raw_nvmeq(dev
, i
);
1227 rcu_assign_pointer(dev
->queues
[i
], NULL
);
1228 call_rcu(&nvmeq
->r_head
, nvme_free_queue
);
1234 * nvme_suspend_queue - put queue into suspended state
1235 * @nvmeq - queue to suspend
1237 * Returns 1 if already suspended, 0 otherwise.
1239 static int nvme_suspend_queue(struct nvme_queue
*nvmeq
)
1241 int vector
= nvmeq
->dev
->entry
[nvmeq
->cq_vector
].vector
;
1243 spin_lock_irq(&nvmeq
->q_lock
);
1244 if (nvmeq
->q_suspended
) {
1245 spin_unlock_irq(&nvmeq
->q_lock
);
1248 nvmeq
->q_suspended
= 1;
1249 nvmeq
->dev
->online_queues
--;
1250 spin_unlock_irq(&nvmeq
->q_lock
);
1252 irq_set_affinity_hint(vector
, NULL
);
1253 free_irq(vector
, nvmeq
);
1258 static void nvme_clear_queue(struct nvme_queue
*nvmeq
)
1260 spin_lock_irq(&nvmeq
->q_lock
);
1261 nvme_process_cq(nvmeq
);
1262 nvme_cancel_ios(nvmeq
, false);
1263 spin_unlock_irq(&nvmeq
->q_lock
);
1266 static void nvme_disable_queue(struct nvme_dev
*dev
, int qid
)
1268 struct nvme_queue
*nvmeq
= raw_nvmeq(dev
, qid
);
1272 if (nvme_suspend_queue(nvmeq
))
1275 /* Don't tell the adapter to delete the admin queue.
1276 * Don't tell a removed adapter to delete IO queues. */
1277 if (qid
&& readl(&dev
->bar
->csts
) != -1) {
1278 adapter_delete_sq(dev
, qid
);
1279 adapter_delete_cq(dev
, qid
);
1281 nvme_clear_queue(nvmeq
);
1284 static struct nvme_queue
*nvme_alloc_queue(struct nvme_dev
*dev
, int qid
,
1285 int depth
, int vector
)
1287 struct device
*dmadev
= &dev
->pci_dev
->dev
;
1288 unsigned extra
= nvme_queue_extra(depth
);
1289 struct nvme_queue
*nvmeq
= kzalloc(sizeof(*nvmeq
) + extra
, GFP_KERNEL
);
1293 nvmeq
->cqes
= dma_zalloc_coherent(dmadev
, CQ_SIZE(depth
),
1294 &nvmeq
->cq_dma_addr
, GFP_KERNEL
);
1298 nvmeq
->sq_cmds
= dma_alloc_coherent(dmadev
, SQ_SIZE(depth
),
1299 &nvmeq
->sq_dma_addr
, GFP_KERNEL
);
1300 if (!nvmeq
->sq_cmds
)
1303 if (qid
&& !zalloc_cpumask_var(&nvmeq
->cpu_mask
, GFP_KERNEL
))
1306 nvmeq
->q_dmadev
= dmadev
;
1308 snprintf(nvmeq
->irqname
, sizeof(nvmeq
->irqname
), "nvme%dq%d",
1309 dev
->instance
, qid
);
1310 spin_lock_init(&nvmeq
->q_lock
);
1312 nvmeq
->cq_phase
= 1;
1313 init_waitqueue_head(&nvmeq
->sq_full
);
1314 init_waitqueue_entry(&nvmeq
->sq_cong_wait
, nvme_thread
);
1315 bio_list_init(&nvmeq
->sq_cong
);
1316 INIT_LIST_HEAD(&nvmeq
->iod_bio
);
1317 nvmeq
->q_db
= &dev
->dbs
[qid
* 2 * dev
->db_stride
];
1318 nvmeq
->q_depth
= depth
;
1319 nvmeq
->cq_vector
= vector
;
1321 nvmeq
->q_suspended
= 1;
1323 rcu_assign_pointer(dev
->queues
[qid
], nvmeq
);
1328 dma_free_coherent(dmadev
, SQ_SIZE(depth
), (void *)nvmeq
->sq_cmds
,
1329 nvmeq
->sq_dma_addr
);
1331 dma_free_coherent(dmadev
, CQ_SIZE(depth
), (void *)nvmeq
->cqes
,
1332 nvmeq
->cq_dma_addr
);
1338 static int queue_request_irq(struct nvme_dev
*dev
, struct nvme_queue
*nvmeq
,
1341 if (use_threaded_interrupts
)
1342 return request_threaded_irq(dev
->entry
[nvmeq
->cq_vector
].vector
,
1343 nvme_irq_check
, nvme_irq
, IRQF_SHARED
,
1345 return request_irq(dev
->entry
[nvmeq
->cq_vector
].vector
, nvme_irq
,
1346 IRQF_SHARED
, name
, nvmeq
);
1349 static void nvme_init_queue(struct nvme_queue
*nvmeq
, u16 qid
)
1351 struct nvme_dev
*dev
= nvmeq
->dev
;
1352 unsigned extra
= nvme_queue_extra(nvmeq
->q_depth
);
1356 nvmeq
->cq_phase
= 1;
1357 nvmeq
->q_db
= &dev
->dbs
[qid
* 2 * dev
->db_stride
];
1358 memset(nvmeq
->cmdid_data
, 0, extra
);
1359 memset((void *)nvmeq
->cqes
, 0, CQ_SIZE(nvmeq
->q_depth
));
1360 nvme_cancel_ios(nvmeq
, false);
1361 nvmeq
->q_suspended
= 0;
1362 dev
->online_queues
++;
1365 static int nvme_create_queue(struct nvme_queue
*nvmeq
, int qid
)
1367 struct nvme_dev
*dev
= nvmeq
->dev
;
1370 result
= adapter_alloc_cq(dev
, qid
, nvmeq
);
1374 result
= adapter_alloc_sq(dev
, qid
, nvmeq
);
1378 result
= queue_request_irq(dev
, nvmeq
, nvmeq
->irqname
);
1382 spin_lock_irq(&nvmeq
->q_lock
);
1383 nvme_init_queue(nvmeq
, qid
);
1384 spin_unlock_irq(&nvmeq
->q_lock
);
1389 adapter_delete_sq(dev
, qid
);
1391 adapter_delete_cq(dev
, qid
);
1395 static int nvme_wait_ready(struct nvme_dev
*dev
, u64 cap
, bool enabled
)
1397 unsigned long timeout
;
1398 u32 bit
= enabled
? NVME_CSTS_RDY
: 0;
1400 timeout
= ((NVME_CAP_TIMEOUT(cap
) + 1) * HZ
/ 2) + jiffies
;
1402 while ((readl(&dev
->bar
->csts
) & NVME_CSTS_RDY
) != bit
) {
1404 if (fatal_signal_pending(current
))
1406 if (time_after(jiffies
, timeout
)) {
1407 dev_err(&dev
->pci_dev
->dev
,
1408 "Device not ready; aborting %s\n", enabled
?
1409 "initialisation" : "reset");
1418 * If the device has been passed off to us in an enabled state, just clear
1419 * the enabled bit. The spec says we should set the 'shutdown notification
1420 * bits', but doing so may cause the device to complete commands to the
1421 * admin queue ... and we don't know what memory that might be pointing at!
1423 static int nvme_disable_ctrl(struct nvme_dev
*dev
, u64 cap
)
1425 dev
->ctrl_config
&= ~NVME_CC_SHN_MASK
;
1426 dev
->ctrl_config
&= ~NVME_CC_ENABLE
;
1427 writel(dev
->ctrl_config
, &dev
->bar
->cc
);
1429 return nvme_wait_ready(dev
, cap
, false);
1432 static int nvme_enable_ctrl(struct nvme_dev
*dev
, u64 cap
)
1434 dev
->ctrl_config
&= ~NVME_CC_SHN_MASK
;
1435 dev
->ctrl_config
|= NVME_CC_ENABLE
;
1436 writel(dev
->ctrl_config
, &dev
->bar
->cc
);
1438 return nvme_wait_ready(dev
, cap
, true);
1441 static int nvme_shutdown_ctrl(struct nvme_dev
*dev
)
1443 unsigned long timeout
;
1445 dev
->ctrl_config
&= ~NVME_CC_SHN_MASK
;
1446 dev
->ctrl_config
|= NVME_CC_SHN_NORMAL
;
1448 writel(dev
->ctrl_config
, &dev
->bar
->cc
);
1450 timeout
= 2 * HZ
+ jiffies
;
1451 while ((readl(&dev
->bar
->csts
) & NVME_CSTS_SHST_MASK
) !=
1452 NVME_CSTS_SHST_CMPLT
) {
1454 if (fatal_signal_pending(current
))
1456 if (time_after(jiffies
, timeout
)) {
1457 dev_err(&dev
->pci_dev
->dev
,
1458 "Device shutdown incomplete; abort shutdown\n");
1466 static int nvme_configure_admin_queue(struct nvme_dev
*dev
)
1470 u64 cap
= readq(&dev
->bar
->cap
);
1471 struct nvme_queue
*nvmeq
;
1472 unsigned page_shift
= PAGE_SHIFT
;
1473 unsigned dev_page_min
= NVME_CAP_MPSMIN(cap
) + 12;
1474 unsigned dev_page_max
= NVME_CAP_MPSMAX(cap
) + 12;
1476 if (page_shift
< dev_page_min
) {
1477 dev_err(&dev
->pci_dev
->dev
,
1478 "Minimum device page size (%u) too large for "
1479 "host (%u)\n", 1 << dev_page_min
,
1483 if (page_shift
> dev_page_max
) {
1484 dev_info(&dev
->pci_dev
->dev
,
1485 "Device maximum page size (%u) smaller than "
1486 "host (%u); enabling work-around\n",
1487 1 << dev_page_max
, 1 << page_shift
);
1488 page_shift
= dev_page_max
;
1491 result
= nvme_disable_ctrl(dev
, cap
);
1495 nvmeq
= raw_nvmeq(dev
, 0);
1497 nvmeq
= nvme_alloc_queue(dev
, 0, 64, 0);
1502 aqa
= nvmeq
->q_depth
- 1;
1505 dev
->page_size
= 1 << page_shift
;
1507 dev
->ctrl_config
= NVME_CC_CSS_NVM
;
1508 dev
->ctrl_config
|= (page_shift
- 12) << NVME_CC_MPS_SHIFT
;
1509 dev
->ctrl_config
|= NVME_CC_ARB_RR
| NVME_CC_SHN_NONE
;
1510 dev
->ctrl_config
|= NVME_CC_IOSQES
| NVME_CC_IOCQES
;
1512 writel(aqa
, &dev
->bar
->aqa
);
1513 writeq(nvmeq
->sq_dma_addr
, &dev
->bar
->asq
);
1514 writeq(nvmeq
->cq_dma_addr
, &dev
->bar
->acq
);
1516 result
= nvme_enable_ctrl(dev
, cap
);
1520 result
= queue_request_irq(dev
, nvmeq
, nvmeq
->irqname
);
1524 spin_lock_irq(&nvmeq
->q_lock
);
1525 nvme_init_queue(nvmeq
, 0);
1526 spin_unlock_irq(&nvmeq
->q_lock
);
1530 struct nvme_iod
*nvme_map_user_pages(struct nvme_dev
*dev
, int write
,
1531 unsigned long addr
, unsigned length
)
1533 int i
, err
, count
, nents
, offset
;
1534 struct scatterlist
*sg
;
1535 struct page
**pages
;
1536 struct nvme_iod
*iod
;
1539 return ERR_PTR(-EINVAL
);
1540 if (!length
|| length
> INT_MAX
- PAGE_SIZE
)
1541 return ERR_PTR(-EINVAL
);
1543 offset
= offset_in_page(addr
);
1544 count
= DIV_ROUND_UP(offset
+ length
, PAGE_SIZE
);
1545 pages
= kcalloc(count
, sizeof(*pages
), GFP_KERNEL
);
1547 return ERR_PTR(-ENOMEM
);
1549 err
= get_user_pages_fast(addr
, count
, 1, pages
);
1557 iod
= nvme_alloc_iod(count
, length
, dev
, GFP_KERNEL
);
1562 sg_init_table(sg
, count
);
1563 for (i
= 0; i
< count
; i
++) {
1564 sg_set_page(&sg
[i
], pages
[i
],
1565 min_t(unsigned, length
, PAGE_SIZE
- offset
),
1567 length
-= (PAGE_SIZE
- offset
);
1570 sg_mark_end(&sg
[i
- 1]);
1573 nents
= dma_map_sg(&dev
->pci_dev
->dev
, sg
, count
,
1574 write
? DMA_TO_DEVICE
: DMA_FROM_DEVICE
);
1584 for (i
= 0; i
< count
; i
++)
1587 return ERR_PTR(err
);
1590 void nvme_unmap_user_pages(struct nvme_dev
*dev
, int write
,
1591 struct nvme_iod
*iod
)
1595 dma_unmap_sg(&dev
->pci_dev
->dev
, iod
->sg
, iod
->nents
,
1596 write
? DMA_TO_DEVICE
: DMA_FROM_DEVICE
);
1598 for (i
= 0; i
< iod
->nents
; i
++)
1599 put_page(sg_page(&iod
->sg
[i
]));
1602 static int nvme_submit_io(struct nvme_ns
*ns
, struct nvme_user_io __user
*uio
)
1604 struct nvme_dev
*dev
= ns
->dev
;
1605 struct nvme_user_io io
;
1606 struct nvme_command c
;
1607 unsigned length
, meta_len
;
1609 struct nvme_iod
*iod
, *meta_iod
= NULL
;
1610 dma_addr_t meta_dma_addr
;
1611 void *meta
, *uninitialized_var(meta_mem
);
1613 if (copy_from_user(&io
, uio
, sizeof(io
)))
1615 length
= (io
.nblocks
+ 1) << ns
->lba_shift
;
1616 meta_len
= (io
.nblocks
+ 1) * ns
->ms
;
1618 if (meta_len
&& ((io
.metadata
& 3) || !io
.metadata
))
1621 switch (io
.opcode
) {
1622 case nvme_cmd_write
:
1624 case nvme_cmd_compare
:
1625 iod
= nvme_map_user_pages(dev
, io
.opcode
& 1, io
.addr
, length
);
1632 return PTR_ERR(iod
);
1634 memset(&c
, 0, sizeof(c
));
1635 c
.rw
.opcode
= io
.opcode
;
1636 c
.rw
.flags
= io
.flags
;
1637 c
.rw
.nsid
= cpu_to_le32(ns
->ns_id
);
1638 c
.rw
.slba
= cpu_to_le64(io
.slba
);
1639 c
.rw
.length
= cpu_to_le16(io
.nblocks
);
1640 c
.rw
.control
= cpu_to_le16(io
.control
);
1641 c
.rw
.dsmgmt
= cpu_to_le32(io
.dsmgmt
);
1642 c
.rw
.reftag
= cpu_to_le32(io
.reftag
);
1643 c
.rw
.apptag
= cpu_to_le16(io
.apptag
);
1644 c
.rw
.appmask
= cpu_to_le16(io
.appmask
);
1647 meta_iod
= nvme_map_user_pages(dev
, io
.opcode
& 1, io
.metadata
,
1649 if (IS_ERR(meta_iod
)) {
1650 status
= PTR_ERR(meta_iod
);
1655 meta_mem
= dma_alloc_coherent(&dev
->pci_dev
->dev
, meta_len
,
1656 &meta_dma_addr
, GFP_KERNEL
);
1662 if (io
.opcode
& 1) {
1663 int meta_offset
= 0;
1665 for (i
= 0; i
< meta_iod
->nents
; i
++) {
1666 meta
= kmap_atomic(sg_page(&meta_iod
->sg
[i
])) +
1667 meta_iod
->sg
[i
].offset
;
1668 memcpy(meta_mem
+ meta_offset
, meta
,
1669 meta_iod
->sg
[i
].length
);
1670 kunmap_atomic(meta
);
1671 meta_offset
+= meta_iod
->sg
[i
].length
;
1675 c
.rw
.metadata
= cpu_to_le64(meta_dma_addr
);
1678 length
= nvme_setup_prps(dev
, iod
, length
, GFP_KERNEL
);
1679 c
.rw
.prp1
= cpu_to_le64(sg_dma_address(iod
->sg
));
1680 c
.rw
.prp2
= cpu_to_le64(iod
->first_dma
);
1682 if (length
!= (io
.nblocks
+ 1) << ns
->lba_shift
)
1685 status
= nvme_submit_io_cmd(dev
, &c
, NULL
);
1688 if (status
== NVME_SC_SUCCESS
&& !(io
.opcode
& 1)) {
1689 int meta_offset
= 0;
1691 for (i
= 0; i
< meta_iod
->nents
; i
++) {
1692 meta
= kmap_atomic(sg_page(&meta_iod
->sg
[i
])) +
1693 meta_iod
->sg
[i
].offset
;
1694 memcpy(meta
, meta_mem
+ meta_offset
,
1695 meta_iod
->sg
[i
].length
);
1696 kunmap_atomic(meta
);
1697 meta_offset
+= meta_iod
->sg
[i
].length
;
1701 dma_free_coherent(&dev
->pci_dev
->dev
, meta_len
, meta_mem
,
1706 nvme_unmap_user_pages(dev
, io
.opcode
& 1, iod
);
1707 nvme_free_iod(dev
, iod
);
1710 nvme_unmap_user_pages(dev
, io
.opcode
& 1, meta_iod
);
1711 nvme_free_iod(dev
, meta_iod
);
1717 static int nvme_user_admin_cmd(struct nvme_dev
*dev
,
1718 struct nvme_admin_cmd __user
*ucmd
)
1720 struct nvme_admin_cmd cmd
;
1721 struct nvme_command c
;
1723 struct nvme_iod
*uninitialized_var(iod
);
1726 if (!capable(CAP_SYS_ADMIN
))
1728 if (copy_from_user(&cmd
, ucmd
, sizeof(cmd
)))
1731 memset(&c
, 0, sizeof(c
));
1732 c
.common
.opcode
= cmd
.opcode
;
1733 c
.common
.flags
= cmd
.flags
;
1734 c
.common
.nsid
= cpu_to_le32(cmd
.nsid
);
1735 c
.common
.cdw2
[0] = cpu_to_le32(cmd
.cdw2
);
1736 c
.common
.cdw2
[1] = cpu_to_le32(cmd
.cdw3
);
1737 c
.common
.cdw10
[0] = cpu_to_le32(cmd
.cdw10
);
1738 c
.common
.cdw10
[1] = cpu_to_le32(cmd
.cdw11
);
1739 c
.common
.cdw10
[2] = cpu_to_le32(cmd
.cdw12
);
1740 c
.common
.cdw10
[3] = cpu_to_le32(cmd
.cdw13
);
1741 c
.common
.cdw10
[4] = cpu_to_le32(cmd
.cdw14
);
1742 c
.common
.cdw10
[5] = cpu_to_le32(cmd
.cdw15
);
1744 length
= cmd
.data_len
;
1746 iod
= nvme_map_user_pages(dev
, cmd
.opcode
& 1, cmd
.addr
,
1749 return PTR_ERR(iod
);
1750 length
= nvme_setup_prps(dev
, iod
, length
, GFP_KERNEL
);
1751 c
.common
.prp1
= cpu_to_le64(sg_dma_address(iod
->sg
));
1752 c
.common
.prp2
= cpu_to_le64(iod
->first_dma
);
1755 timeout
= cmd
.timeout_ms
? msecs_to_jiffies(cmd
.timeout_ms
) :
1757 if (length
!= cmd
.data_len
)
1760 status
= nvme_submit_sync_cmd(dev
, 0, &c
, &cmd
.result
, timeout
);
1763 nvme_unmap_user_pages(dev
, cmd
.opcode
& 1, iod
);
1764 nvme_free_iod(dev
, iod
);
1767 if ((status
>= 0) && copy_to_user(&ucmd
->result
, &cmd
.result
,
1768 sizeof(cmd
.result
)))
1774 static int nvme_ioctl(struct block_device
*bdev
, fmode_t mode
, unsigned int cmd
,
1777 struct nvme_ns
*ns
= bdev
->bd_disk
->private_data
;
1781 force_successful_syscall_return();
1783 case NVME_IOCTL_ADMIN_CMD
:
1784 return nvme_user_admin_cmd(ns
->dev
, (void __user
*)arg
);
1785 case NVME_IOCTL_SUBMIT_IO
:
1786 return nvme_submit_io(ns
, (void __user
*)arg
);
1787 case SG_GET_VERSION_NUM
:
1788 return nvme_sg_get_version_num((void __user
*)arg
);
1790 return nvme_sg_io(ns
, (void __user
*)arg
);
1796 #ifdef CONFIG_COMPAT
1797 static int nvme_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1798 unsigned int cmd
, unsigned long arg
)
1800 struct nvme_ns
*ns
= bdev
->bd_disk
->private_data
;
1804 return nvme_sg_io32(ns
, arg
);
1806 return nvme_ioctl(bdev
, mode
, cmd
, arg
);
1809 #define nvme_compat_ioctl NULL
1812 static int nvme_open(struct block_device
*bdev
, fmode_t mode
)
1814 struct nvme_ns
*ns
= bdev
->bd_disk
->private_data
;
1815 struct nvme_dev
*dev
= ns
->dev
;
1817 kref_get(&dev
->kref
);
1821 static void nvme_free_dev(struct kref
*kref
);
1823 static void nvme_release(struct gendisk
*disk
, fmode_t mode
)
1825 struct nvme_ns
*ns
= disk
->private_data
;
1826 struct nvme_dev
*dev
= ns
->dev
;
1828 kref_put(&dev
->kref
, nvme_free_dev
);
1831 static int nvme_getgeo(struct block_device
*bd
, struct hd_geometry
*geo
)
1833 /* some standard values */
1834 geo
->heads
= 1 << 6;
1835 geo
->sectors
= 1 << 5;
1836 geo
->cylinders
= get_capacity(bd
->bd_disk
) >> 11;
1840 static const struct block_device_operations nvme_fops
= {
1841 .owner
= THIS_MODULE
,
1842 .ioctl
= nvme_ioctl
,
1843 .compat_ioctl
= nvme_compat_ioctl
,
1845 .release
= nvme_release
,
1846 .getgeo
= nvme_getgeo
,
1849 static void nvme_resubmit_iods(struct nvme_queue
*nvmeq
)
1851 struct nvme_iod
*iod
, *next
;
1853 list_for_each_entry_safe(iod
, next
, &nvmeq
->iod_bio
, node
) {
1854 if (unlikely(nvme_submit_iod(nvmeq
, iod
)))
1856 list_del(&iod
->node
);
1857 if (bio_list_empty(&nvmeq
->sq_cong
) &&
1858 list_empty(&nvmeq
->iod_bio
))
1859 remove_wait_queue(&nvmeq
->sq_full
,
1860 &nvmeq
->sq_cong_wait
);
1864 static void nvme_resubmit_bios(struct nvme_queue
*nvmeq
)
1866 while (bio_list_peek(&nvmeq
->sq_cong
)) {
1867 struct bio
*bio
= bio_list_pop(&nvmeq
->sq_cong
);
1868 struct nvme_ns
*ns
= bio
->bi_bdev
->bd_disk
->private_data
;
1870 if (bio_list_empty(&nvmeq
->sq_cong
) &&
1871 list_empty(&nvmeq
->iod_bio
))
1872 remove_wait_queue(&nvmeq
->sq_full
,
1873 &nvmeq
->sq_cong_wait
);
1874 if (nvme_submit_bio_queue(nvmeq
, ns
, bio
)) {
1875 if (!waitqueue_active(&nvmeq
->sq_full
))
1876 add_wait_queue(&nvmeq
->sq_full
,
1877 &nvmeq
->sq_cong_wait
);
1878 bio_list_add_head(&nvmeq
->sq_cong
, bio
);
1884 static int nvme_submit_async_req(struct nvme_queue
*nvmeq
)
1886 struct nvme_command
*c
;
1889 cmdid
= alloc_cmdid(nvmeq
, CMD_CTX_ASYNC
, special_completion
, 0);
1893 c
= &nvmeq
->sq_cmds
[nvmeq
->sq_tail
];
1894 memset(c
, 0, sizeof(*c
));
1895 c
->common
.opcode
= nvme_admin_async_event
;
1896 c
->common
.command_id
= cmdid
;
1898 if (++nvmeq
->sq_tail
== nvmeq
->q_depth
)
1900 writel(nvmeq
->sq_tail
, nvmeq
->q_db
);
1905 static int nvme_kthread(void *data
)
1907 struct nvme_dev
*dev
, *next
;
1909 while (!kthread_should_stop()) {
1910 set_current_state(TASK_INTERRUPTIBLE
);
1911 spin_lock(&dev_list_lock
);
1912 list_for_each_entry_safe(dev
, next
, &dev_list
, node
) {
1914 if (readl(&dev
->bar
->csts
) & NVME_CSTS_CFS
&&
1916 if (work_busy(&dev
->reset_work
))
1918 list_del_init(&dev
->node
);
1919 dev_warn(&dev
->pci_dev
->dev
,
1920 "Failed status, reset controller\n");
1921 dev
->reset_workfn
= nvme_reset_failed_dev
;
1922 queue_work(nvme_workq
, &dev
->reset_work
);
1926 for (i
= 0; i
< dev
->queue_count
; i
++) {
1927 struct nvme_queue
*nvmeq
=
1928 rcu_dereference(dev
->queues
[i
]);
1931 spin_lock_irq(&nvmeq
->q_lock
);
1932 if (nvmeq
->q_suspended
)
1934 nvme_process_cq(nvmeq
);
1935 nvme_cancel_ios(nvmeq
, true);
1936 nvme_resubmit_bios(nvmeq
);
1937 nvme_resubmit_iods(nvmeq
);
1939 while ((i
== 0) && (dev
->event_limit
> 0)) {
1940 if (nvme_submit_async_req(nvmeq
))
1945 spin_unlock_irq(&nvmeq
->q_lock
);
1949 spin_unlock(&dev_list_lock
);
1950 schedule_timeout(round_jiffies_relative(HZ
));
1955 static void nvme_config_discard(struct nvme_ns
*ns
)
1957 u32 logical_block_size
= queue_logical_block_size(ns
->queue
);
1958 ns
->queue
->limits
.discard_zeroes_data
= 0;
1959 ns
->queue
->limits
.discard_alignment
= logical_block_size
;
1960 ns
->queue
->limits
.discard_granularity
= logical_block_size
;
1961 ns
->queue
->limits
.max_discard_sectors
= 0xffffffff;
1962 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, ns
->queue
);
1965 static struct nvme_ns
*nvme_alloc_ns(struct nvme_dev
*dev
, unsigned nsid
,
1966 struct nvme_id_ns
*id
, struct nvme_lba_range_type
*rt
)
1969 struct gendisk
*disk
;
1972 if (rt
->attributes
& NVME_LBART_ATTRIB_HIDE
)
1975 ns
= kzalloc(sizeof(*ns
), GFP_KERNEL
);
1978 ns
->queue
= blk_alloc_queue(GFP_KERNEL
);
1981 ns
->queue
->queue_flags
= QUEUE_FLAG_DEFAULT
;
1982 queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES
, ns
->queue
);
1983 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, ns
->queue
);
1984 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM
, ns
->queue
);
1985 blk_queue_make_request(ns
->queue
, nvme_make_request
);
1987 ns
->queue
->queuedata
= ns
;
1989 disk
= alloc_disk(0);
1991 goto out_free_queue
;
1994 lbaf
= id
->flbas
& 0xf;
1995 ns
->lba_shift
= id
->lbaf
[lbaf
].ds
;
1996 ns
->ms
= le16_to_cpu(id
->lbaf
[lbaf
].ms
);
1997 blk_queue_logical_block_size(ns
->queue
, 1 << ns
->lba_shift
);
1998 if (dev
->max_hw_sectors
)
1999 blk_queue_max_hw_sectors(ns
->queue
, dev
->max_hw_sectors
);
2000 if (dev
->vwc
& NVME_CTRL_VWC_PRESENT
)
2001 blk_queue_flush(ns
->queue
, REQ_FLUSH
| REQ_FUA
);
2003 disk
->major
= nvme_major
;
2004 disk
->first_minor
= 0;
2005 disk
->fops
= &nvme_fops
;
2006 disk
->private_data
= ns
;
2007 disk
->queue
= ns
->queue
;
2008 disk
->driverfs_dev
= &dev
->pci_dev
->dev
;
2009 disk
->flags
= GENHD_FL_EXT_DEVT
;
2010 sprintf(disk
->disk_name
, "nvme%dn%d", dev
->instance
, nsid
);
2011 set_capacity(disk
, le64_to_cpup(&id
->nsze
) << (ns
->lba_shift
- 9));
2013 if (dev
->oncs
& NVME_CTRL_ONCS_DSM
)
2014 nvme_config_discard(ns
);
2019 blk_cleanup_queue(ns
->queue
);
2025 static int nvme_find_closest_node(int node
)
2027 int n
, val
, min_val
= INT_MAX
, best_node
= node
;
2029 for_each_online_node(n
) {
2032 val
= node_distance(node
, n
);
2033 if (val
< min_val
) {
2041 static void nvme_set_queue_cpus(cpumask_t
*qmask
, struct nvme_queue
*nvmeq
,
2045 for_each_cpu(cpu
, qmask
) {
2046 if (cpumask_weight(nvmeq
->cpu_mask
) >= count
)
2048 if (!cpumask_test_and_set_cpu(cpu
, nvmeq
->cpu_mask
))
2049 *per_cpu_ptr(nvmeq
->dev
->io_queue
, cpu
) = nvmeq
->qid
;
2053 static void nvme_add_cpus(cpumask_t
*mask
, const cpumask_t
*unassigned_cpus
,
2054 const cpumask_t
*new_mask
, struct nvme_queue
*nvmeq
, int cpus_per_queue
)
2057 for_each_cpu(next_cpu
, new_mask
) {
2058 cpumask_or(mask
, mask
, get_cpu_mask(next_cpu
));
2059 cpumask_or(mask
, mask
, topology_thread_cpumask(next_cpu
));
2060 cpumask_and(mask
, mask
, unassigned_cpus
);
2061 nvme_set_queue_cpus(mask
, nvmeq
, cpus_per_queue
);
2065 static void nvme_create_io_queues(struct nvme_dev
*dev
)
2069 max
= min(dev
->max_qid
, num_online_cpus());
2070 for (i
= dev
->queue_count
; i
<= max
; i
++)
2071 if (!nvme_alloc_queue(dev
, i
, dev
->q_depth
, i
- 1))
2074 max
= min(dev
->queue_count
- 1, num_online_cpus());
2075 for (i
= dev
->online_queues
; i
<= max
; i
++)
2076 if (nvme_create_queue(raw_nvmeq(dev
, i
), i
))
2081 * If there are fewer queues than online cpus, this will try to optimally
2082 * assign a queue to multiple cpus by grouping cpus that are "close" together:
2083 * thread siblings, core, socket, closest node, then whatever else is
2086 static void nvme_assign_io_queues(struct nvme_dev
*dev
)
2088 unsigned cpu
, cpus_per_queue
, queues
, remainder
, i
;
2089 cpumask_var_t unassigned_cpus
;
2091 nvme_create_io_queues(dev
);
2093 queues
= min(dev
->online_queues
- 1, num_online_cpus());
2097 cpus_per_queue
= num_online_cpus() / queues
;
2098 remainder
= queues
- (num_online_cpus() - queues
* cpus_per_queue
);
2100 if (!alloc_cpumask_var(&unassigned_cpus
, GFP_KERNEL
))
2103 cpumask_copy(unassigned_cpus
, cpu_online_mask
);
2104 cpu
= cpumask_first(unassigned_cpus
);
2105 for (i
= 1; i
<= queues
; i
++) {
2106 struct nvme_queue
*nvmeq
= lock_nvmeq(dev
, i
);
2109 cpumask_clear(nvmeq
->cpu_mask
);
2110 if (!cpumask_weight(unassigned_cpus
)) {
2111 unlock_nvmeq(nvmeq
);
2115 mask
= *get_cpu_mask(cpu
);
2116 nvme_set_queue_cpus(&mask
, nvmeq
, cpus_per_queue
);
2117 if (cpus_weight(mask
) < cpus_per_queue
)
2118 nvme_add_cpus(&mask
, unassigned_cpus
,
2119 topology_thread_cpumask(cpu
),
2120 nvmeq
, cpus_per_queue
);
2121 if (cpus_weight(mask
) < cpus_per_queue
)
2122 nvme_add_cpus(&mask
, unassigned_cpus
,
2123 topology_core_cpumask(cpu
),
2124 nvmeq
, cpus_per_queue
);
2125 if (cpus_weight(mask
) < cpus_per_queue
)
2126 nvme_add_cpus(&mask
, unassigned_cpus
,
2127 cpumask_of_node(cpu_to_node(cpu
)),
2128 nvmeq
, cpus_per_queue
);
2129 if (cpus_weight(mask
) < cpus_per_queue
)
2130 nvme_add_cpus(&mask
, unassigned_cpus
,
2132 nvme_find_closest_node(
2134 nvmeq
, cpus_per_queue
);
2135 if (cpus_weight(mask
) < cpus_per_queue
)
2136 nvme_add_cpus(&mask
, unassigned_cpus
,
2138 nvmeq
, cpus_per_queue
);
2140 WARN(cpumask_weight(nvmeq
->cpu_mask
) != cpus_per_queue
,
2141 "nvme%d qid:%d mis-matched queue-to-cpu assignment\n",
2144 irq_set_affinity_hint(dev
->entry
[nvmeq
->cq_vector
].vector
,
2146 cpumask_andnot(unassigned_cpus
, unassigned_cpus
,
2148 cpu
= cpumask_next(cpu
, unassigned_cpus
);
2149 if (remainder
&& !--remainder
)
2151 unlock_nvmeq(nvmeq
);
2153 WARN(cpumask_weight(unassigned_cpus
), "nvme%d unassigned online cpus\n",
2156 cpumask_andnot(unassigned_cpus
, cpu_possible_mask
, cpu_online_mask
);
2157 for_each_cpu(cpu
, unassigned_cpus
)
2158 *per_cpu_ptr(dev
->io_queue
, cpu
) = (i
++ % queues
) + 1;
2159 free_cpumask_var(unassigned_cpus
);
2162 static int set_queue_count(struct nvme_dev
*dev
, int count
)
2166 u32 q_count
= (count
- 1) | ((count
- 1) << 16);
2168 status
= nvme_set_features(dev
, NVME_FEAT_NUM_QUEUES
, q_count
, 0,
2173 dev_err(&dev
->pci_dev
->dev
, "Could not set queue count (%d)\n",
2177 return min(result
& 0xffff, result
>> 16) + 1;
2180 static size_t db_bar_size(struct nvme_dev
*dev
, unsigned nr_io_queues
)
2182 return 4096 + ((nr_io_queues
+ 1) * 8 * dev
->db_stride
);
2185 static void nvme_cpu_workfn(struct work_struct
*work
)
2187 struct nvme_dev
*dev
= container_of(work
, struct nvme_dev
, cpu_work
);
2188 if (dev
->initialized
)
2189 nvme_assign_io_queues(dev
);
2192 static int nvme_cpu_notify(struct notifier_block
*self
,
2193 unsigned long action
, void *hcpu
)
2195 struct nvme_dev
*dev
;
2200 spin_lock(&dev_list_lock
);
2201 list_for_each_entry(dev
, &dev_list
, node
)
2202 schedule_work(&dev
->cpu_work
);
2203 spin_unlock(&dev_list_lock
);
2209 static int nvme_setup_io_queues(struct nvme_dev
*dev
)
2211 struct nvme_queue
*adminq
= raw_nvmeq(dev
, 0);
2212 struct pci_dev
*pdev
= dev
->pci_dev
;
2213 int result
, i
, vecs
, nr_io_queues
, size
;
2215 nr_io_queues
= num_possible_cpus();
2216 result
= set_queue_count(dev
, nr_io_queues
);
2219 if (result
< nr_io_queues
)
2220 nr_io_queues
= result
;
2222 size
= db_bar_size(dev
, nr_io_queues
);
2226 dev
->bar
= ioremap(pci_resource_start(pdev
, 0), size
);
2229 if (!--nr_io_queues
)
2231 size
= db_bar_size(dev
, nr_io_queues
);
2233 dev
->dbs
= ((void __iomem
*)dev
->bar
) + 4096;
2234 adminq
->q_db
= dev
->dbs
;
2237 /* Deregister the admin queue's interrupt */
2238 free_irq(dev
->entry
[0].vector
, adminq
);
2240 for (i
= 0; i
< nr_io_queues
; i
++)
2241 dev
->entry
[i
].entry
= i
;
2242 vecs
= pci_enable_msix_range(pdev
, dev
->entry
, 1, nr_io_queues
);
2244 vecs
= pci_enable_msi_range(pdev
, 1, min(nr_io_queues
, 32));
2248 for (i
= 0; i
< vecs
; i
++)
2249 dev
->entry
[i
].vector
= i
+ pdev
->irq
;
2254 * Should investigate if there's a performance win from allocating
2255 * more queues than interrupt vectors; it might allow the submission
2256 * path to scale better, even if the receive path is limited by the
2257 * number of interrupts.
2259 nr_io_queues
= vecs
;
2260 dev
->max_qid
= nr_io_queues
;
2262 result
= queue_request_irq(dev
, adminq
, adminq
->irqname
);
2264 adminq
->q_suspended
= 1;
2268 /* Free previously allocated queues that are no longer usable */
2269 nvme_free_queues(dev
, nr_io_queues
+ 1);
2270 nvme_assign_io_queues(dev
);
2275 nvme_free_queues(dev
, 1);
2280 * Return: error value if an error occurred setting up the queues or calling
2281 * Identify Device. 0 if these succeeded, even if adding some of the
2282 * namespaces failed. At the moment, these failures are silent. TBD which
2283 * failures should be reported.
2285 static int nvme_dev_add(struct nvme_dev
*dev
)
2287 struct pci_dev
*pdev
= dev
->pci_dev
;
2291 struct nvme_id_ctrl
*ctrl
;
2292 struct nvme_id_ns
*id_ns
;
2294 dma_addr_t dma_addr
;
2295 int shift
= NVME_CAP_MPSMIN(readq(&dev
->bar
->cap
)) + 12;
2297 mem
= dma_alloc_coherent(&pdev
->dev
, 8192, &dma_addr
, GFP_KERNEL
);
2301 res
= nvme_identify(dev
, 0, 1, dma_addr
);
2303 dev_err(&pdev
->dev
, "Identify Controller failed (%d)\n", res
);
2309 nn
= le32_to_cpup(&ctrl
->nn
);
2310 dev
->oncs
= le16_to_cpup(&ctrl
->oncs
);
2311 dev
->abort_limit
= ctrl
->acl
+ 1;
2312 dev
->vwc
= ctrl
->vwc
;
2313 dev
->event_limit
= min(ctrl
->aerl
+ 1, 8);
2314 memcpy(dev
->serial
, ctrl
->sn
, sizeof(ctrl
->sn
));
2315 memcpy(dev
->model
, ctrl
->mn
, sizeof(ctrl
->mn
));
2316 memcpy(dev
->firmware_rev
, ctrl
->fr
, sizeof(ctrl
->fr
));
2318 dev
->max_hw_sectors
= 1 << (ctrl
->mdts
+ shift
- 9);
2319 if ((pdev
->vendor
== PCI_VENDOR_ID_INTEL
) &&
2320 (pdev
->device
== 0x0953) && ctrl
->vs
[3])
2321 dev
->stripe_size
= 1 << (ctrl
->vs
[3] + shift
);
2324 for (i
= 1; i
<= nn
; i
++) {
2325 res
= nvme_identify(dev
, i
, 0, dma_addr
);
2329 if (id_ns
->ncap
== 0)
2332 res
= nvme_get_features(dev
, NVME_FEAT_LBA_RANGE
, i
,
2333 dma_addr
+ 4096, NULL
);
2335 memset(mem
+ 4096, 0, 4096);
2337 ns
= nvme_alloc_ns(dev
, i
, mem
, mem
+ 4096);
2339 list_add_tail(&ns
->list
, &dev
->namespaces
);
2341 list_for_each_entry(ns
, &dev
->namespaces
, list
)
2346 dma_free_coherent(&dev
->pci_dev
->dev
, 8192, mem
, dma_addr
);
2350 static int nvme_dev_map(struct nvme_dev
*dev
)
2353 int bars
, result
= -ENOMEM
;
2354 struct pci_dev
*pdev
= dev
->pci_dev
;
2356 if (pci_enable_device_mem(pdev
))
2359 dev
->entry
[0].vector
= pdev
->irq
;
2360 pci_set_master(pdev
);
2361 bars
= pci_select_bars(pdev
, IORESOURCE_MEM
);
2362 if (pci_request_selected_regions(pdev
, bars
, "nvme"))
2365 if (dma_set_mask_and_coherent(&pdev
->dev
, DMA_BIT_MASK(64)) &&
2366 dma_set_mask_and_coherent(&pdev
->dev
, DMA_BIT_MASK(32)))
2369 dev
->bar
= ioremap(pci_resource_start(pdev
, 0), 8192);
2372 if (readl(&dev
->bar
->csts
) == -1) {
2376 cap
= readq(&dev
->bar
->cap
);
2377 dev
->q_depth
= min_t(int, NVME_CAP_MQES(cap
) + 1, NVME_Q_DEPTH
);
2378 dev
->db_stride
= 1 << NVME_CAP_STRIDE(cap
);
2379 dev
->dbs
= ((void __iomem
*)dev
->bar
) + 4096;
2387 pci_release_regions(pdev
);
2389 pci_disable_device(pdev
);
2393 static void nvme_dev_unmap(struct nvme_dev
*dev
)
2395 if (dev
->pci_dev
->msi_enabled
)
2396 pci_disable_msi(dev
->pci_dev
);
2397 else if (dev
->pci_dev
->msix_enabled
)
2398 pci_disable_msix(dev
->pci_dev
);
2403 pci_release_regions(dev
->pci_dev
);
2406 if (pci_is_enabled(dev
->pci_dev
))
2407 pci_disable_device(dev
->pci_dev
);
2410 struct nvme_delq_ctx
{
2411 struct task_struct
*waiter
;
2412 struct kthread_worker
*worker
;
2416 static void nvme_wait_dq(struct nvme_delq_ctx
*dq
, struct nvme_dev
*dev
)
2418 dq
->waiter
= current
;
2422 set_current_state(TASK_KILLABLE
);
2423 if (!atomic_read(&dq
->refcount
))
2425 if (!schedule_timeout(ADMIN_TIMEOUT
) ||
2426 fatal_signal_pending(current
)) {
2427 set_current_state(TASK_RUNNING
);
2429 nvme_disable_ctrl(dev
, readq(&dev
->bar
->cap
));
2430 nvme_disable_queue(dev
, 0);
2432 send_sig(SIGKILL
, dq
->worker
->task
, 1);
2433 flush_kthread_worker(dq
->worker
);
2437 set_current_state(TASK_RUNNING
);
2440 static void nvme_put_dq(struct nvme_delq_ctx
*dq
)
2442 atomic_dec(&dq
->refcount
);
2444 wake_up_process(dq
->waiter
);
2447 static struct nvme_delq_ctx
*nvme_get_dq(struct nvme_delq_ctx
*dq
)
2449 atomic_inc(&dq
->refcount
);
2453 static void nvme_del_queue_end(struct nvme_queue
*nvmeq
)
2455 struct nvme_delq_ctx
*dq
= nvmeq
->cmdinfo
.ctx
;
2457 nvme_clear_queue(nvmeq
);
2461 static int adapter_async_del_queue(struct nvme_queue
*nvmeq
, u8 opcode
,
2462 kthread_work_func_t fn
)
2464 struct nvme_command c
;
2466 memset(&c
, 0, sizeof(c
));
2467 c
.delete_queue
.opcode
= opcode
;
2468 c
.delete_queue
.qid
= cpu_to_le16(nvmeq
->qid
);
2470 init_kthread_work(&nvmeq
->cmdinfo
.work
, fn
);
2471 return nvme_submit_admin_cmd_async(nvmeq
->dev
, &c
, &nvmeq
->cmdinfo
);
2474 static void nvme_del_cq_work_handler(struct kthread_work
*work
)
2476 struct nvme_queue
*nvmeq
= container_of(work
, struct nvme_queue
,
2478 nvme_del_queue_end(nvmeq
);
2481 static int nvme_delete_cq(struct nvme_queue
*nvmeq
)
2483 return adapter_async_del_queue(nvmeq
, nvme_admin_delete_cq
,
2484 nvme_del_cq_work_handler
);
2487 static void nvme_del_sq_work_handler(struct kthread_work
*work
)
2489 struct nvme_queue
*nvmeq
= container_of(work
, struct nvme_queue
,
2491 int status
= nvmeq
->cmdinfo
.status
;
2494 status
= nvme_delete_cq(nvmeq
);
2496 nvme_del_queue_end(nvmeq
);
2499 static int nvme_delete_sq(struct nvme_queue
*nvmeq
)
2501 return adapter_async_del_queue(nvmeq
, nvme_admin_delete_sq
,
2502 nvme_del_sq_work_handler
);
2505 static void nvme_del_queue_start(struct kthread_work
*work
)
2507 struct nvme_queue
*nvmeq
= container_of(work
, struct nvme_queue
,
2509 allow_signal(SIGKILL
);
2510 if (nvme_delete_sq(nvmeq
))
2511 nvme_del_queue_end(nvmeq
);
2514 static void nvme_disable_io_queues(struct nvme_dev
*dev
)
2517 DEFINE_KTHREAD_WORKER_ONSTACK(worker
);
2518 struct nvme_delq_ctx dq
;
2519 struct task_struct
*kworker_task
= kthread_run(kthread_worker_fn
,
2520 &worker
, "nvme%d", dev
->instance
);
2522 if (IS_ERR(kworker_task
)) {
2523 dev_err(&dev
->pci_dev
->dev
,
2524 "Failed to create queue del task\n");
2525 for (i
= dev
->queue_count
- 1; i
> 0; i
--)
2526 nvme_disable_queue(dev
, i
);
2531 atomic_set(&dq
.refcount
, 0);
2532 dq
.worker
= &worker
;
2533 for (i
= dev
->queue_count
- 1; i
> 0; i
--) {
2534 struct nvme_queue
*nvmeq
= raw_nvmeq(dev
, i
);
2536 if (nvme_suspend_queue(nvmeq
))
2538 nvmeq
->cmdinfo
.ctx
= nvme_get_dq(&dq
);
2539 nvmeq
->cmdinfo
.worker
= dq
.worker
;
2540 init_kthread_work(&nvmeq
->cmdinfo
.work
, nvme_del_queue_start
);
2541 queue_kthread_work(dq
.worker
, &nvmeq
->cmdinfo
.work
);
2543 nvme_wait_dq(&dq
, dev
);
2544 kthread_stop(kworker_task
);
2548 * Remove the node from the device list and check
2549 * for whether or not we need to stop the nvme_thread.
2551 static void nvme_dev_list_remove(struct nvme_dev
*dev
)
2553 struct task_struct
*tmp
= NULL
;
2555 spin_lock(&dev_list_lock
);
2556 list_del_init(&dev
->node
);
2557 if (list_empty(&dev_list
) && !IS_ERR_OR_NULL(nvme_thread
)) {
2561 spin_unlock(&dev_list_lock
);
2567 static void nvme_dev_shutdown(struct nvme_dev
*dev
)
2571 dev
->initialized
= 0;
2572 nvme_dev_list_remove(dev
);
2574 if (!dev
->bar
|| (dev
->bar
&& readl(&dev
->bar
->csts
) == -1)) {
2575 for (i
= dev
->queue_count
- 1; i
>= 0; i
--) {
2576 struct nvme_queue
*nvmeq
= raw_nvmeq(dev
, i
);
2577 nvme_suspend_queue(nvmeq
);
2578 nvme_clear_queue(nvmeq
);
2581 nvme_disable_io_queues(dev
);
2582 nvme_shutdown_ctrl(dev
);
2583 nvme_disable_queue(dev
, 0);
2585 nvme_dev_unmap(dev
);
2588 static void nvme_dev_remove(struct nvme_dev
*dev
)
2592 list_for_each_entry(ns
, &dev
->namespaces
, list
) {
2593 if (ns
->disk
->flags
& GENHD_FL_UP
)
2594 del_gendisk(ns
->disk
);
2595 if (!blk_queue_dying(ns
->queue
))
2596 blk_cleanup_queue(ns
->queue
);
2600 static int nvme_setup_prp_pools(struct nvme_dev
*dev
)
2602 struct device
*dmadev
= &dev
->pci_dev
->dev
;
2603 dev
->prp_page_pool
= dma_pool_create("prp list page", dmadev
,
2604 PAGE_SIZE
, PAGE_SIZE
, 0);
2605 if (!dev
->prp_page_pool
)
2608 /* Optimisation for I/Os between 4k and 128k */
2609 dev
->prp_small_pool
= dma_pool_create("prp list 256", dmadev
,
2611 if (!dev
->prp_small_pool
) {
2612 dma_pool_destroy(dev
->prp_page_pool
);
2618 static void nvme_release_prp_pools(struct nvme_dev
*dev
)
2620 dma_pool_destroy(dev
->prp_page_pool
);
2621 dma_pool_destroy(dev
->prp_small_pool
);
2624 static DEFINE_IDA(nvme_instance_ida
);
2626 static int nvme_set_instance(struct nvme_dev
*dev
)
2628 int instance
, error
;
2631 if (!ida_pre_get(&nvme_instance_ida
, GFP_KERNEL
))
2634 spin_lock(&dev_list_lock
);
2635 error
= ida_get_new(&nvme_instance_ida
, &instance
);
2636 spin_unlock(&dev_list_lock
);
2637 } while (error
== -EAGAIN
);
2642 dev
->instance
= instance
;
2646 static void nvme_release_instance(struct nvme_dev
*dev
)
2648 spin_lock(&dev_list_lock
);
2649 ida_remove(&nvme_instance_ida
, dev
->instance
);
2650 spin_unlock(&dev_list_lock
);
2653 static void nvme_free_namespaces(struct nvme_dev
*dev
)
2655 struct nvme_ns
*ns
, *next
;
2657 list_for_each_entry_safe(ns
, next
, &dev
->namespaces
, list
) {
2658 list_del(&ns
->list
);
2664 static void nvme_free_dev(struct kref
*kref
)
2666 struct nvme_dev
*dev
= container_of(kref
, struct nvme_dev
, kref
);
2668 nvme_free_namespaces(dev
);
2669 free_percpu(dev
->io_queue
);
2675 static int nvme_dev_open(struct inode
*inode
, struct file
*f
)
2677 struct nvme_dev
*dev
= container_of(f
->private_data
, struct nvme_dev
,
2679 kref_get(&dev
->kref
);
2680 f
->private_data
= dev
;
2684 static int nvme_dev_release(struct inode
*inode
, struct file
*f
)
2686 struct nvme_dev
*dev
= f
->private_data
;
2687 kref_put(&dev
->kref
, nvme_free_dev
);
2691 static long nvme_dev_ioctl(struct file
*f
, unsigned int cmd
, unsigned long arg
)
2693 struct nvme_dev
*dev
= f
->private_data
;
2695 case NVME_IOCTL_ADMIN_CMD
:
2696 return nvme_user_admin_cmd(dev
, (void __user
*)arg
);
2702 static const struct file_operations nvme_dev_fops
= {
2703 .owner
= THIS_MODULE
,
2704 .open
= nvme_dev_open
,
2705 .release
= nvme_dev_release
,
2706 .unlocked_ioctl
= nvme_dev_ioctl
,
2707 .compat_ioctl
= nvme_dev_ioctl
,
2710 static int nvme_dev_start(struct nvme_dev
*dev
)
2713 bool start_thread
= false;
2715 result
= nvme_dev_map(dev
);
2719 result
= nvme_configure_admin_queue(dev
);
2723 spin_lock(&dev_list_lock
);
2724 if (list_empty(&dev_list
) && IS_ERR_OR_NULL(nvme_thread
)) {
2725 start_thread
= true;
2728 list_add(&dev
->node
, &dev_list
);
2729 spin_unlock(&dev_list_lock
);
2732 nvme_thread
= kthread_run(nvme_kthread
, NULL
, "nvme");
2733 wake_up(&nvme_kthread_wait
);
2735 wait_event_killable(nvme_kthread_wait
, nvme_thread
);
2737 if (IS_ERR_OR_NULL(nvme_thread
)) {
2738 result
= nvme_thread
? PTR_ERR(nvme_thread
) : -EINTR
;
2742 result
= nvme_setup_io_queues(dev
);
2749 nvme_disable_queue(dev
, 0);
2750 nvme_dev_list_remove(dev
);
2752 nvme_dev_unmap(dev
);
2756 static int nvme_remove_dead_ctrl(void *arg
)
2758 struct nvme_dev
*dev
= (struct nvme_dev
*)arg
;
2759 struct pci_dev
*pdev
= dev
->pci_dev
;
2761 if (pci_get_drvdata(pdev
))
2762 pci_stop_and_remove_bus_device(pdev
);
2763 kref_put(&dev
->kref
, nvme_free_dev
);
2767 static void nvme_remove_disks(struct work_struct
*ws
)
2769 struct nvme_dev
*dev
= container_of(ws
, struct nvme_dev
, reset_work
);
2771 nvme_dev_remove(dev
);
2772 nvme_free_queues(dev
, 1);
2775 static int nvme_dev_resume(struct nvme_dev
*dev
)
2779 ret
= nvme_dev_start(dev
);
2782 if (dev
->online_queues
< 2) {
2783 spin_lock(&dev_list_lock
);
2784 dev
->reset_workfn
= nvme_remove_disks
;
2785 queue_work(nvme_workq
, &dev
->reset_work
);
2786 spin_unlock(&dev_list_lock
);
2788 dev
->initialized
= 1;
2792 static void nvme_dev_reset(struct nvme_dev
*dev
)
2794 nvme_dev_shutdown(dev
);
2795 if (nvme_dev_resume(dev
)) {
2796 dev_err(&dev
->pci_dev
->dev
, "Device failed to resume\n");
2797 kref_get(&dev
->kref
);
2798 if (IS_ERR(kthread_run(nvme_remove_dead_ctrl
, dev
, "nvme%d",
2800 dev_err(&dev
->pci_dev
->dev
,
2801 "Failed to start controller remove task\n");
2802 kref_put(&dev
->kref
, nvme_free_dev
);
2807 static void nvme_reset_failed_dev(struct work_struct
*ws
)
2809 struct nvme_dev
*dev
= container_of(ws
, struct nvme_dev
, reset_work
);
2810 nvme_dev_reset(dev
);
2813 static void nvme_reset_workfn(struct work_struct
*work
)
2815 struct nvme_dev
*dev
= container_of(work
, struct nvme_dev
, reset_work
);
2816 dev
->reset_workfn(work
);
2819 static int nvme_probe(struct pci_dev
*pdev
, const struct pci_device_id
*id
)
2821 int result
= -ENOMEM
;
2822 struct nvme_dev
*dev
;
2824 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
2827 dev
->entry
= kcalloc(num_possible_cpus(), sizeof(*dev
->entry
),
2831 dev
->queues
= kcalloc(num_possible_cpus() + 1, sizeof(void *),
2835 dev
->io_queue
= alloc_percpu(unsigned short);
2839 INIT_LIST_HEAD(&dev
->namespaces
);
2840 dev
->reset_workfn
= nvme_reset_failed_dev
;
2841 INIT_WORK(&dev
->reset_work
, nvme_reset_workfn
);
2842 INIT_WORK(&dev
->cpu_work
, nvme_cpu_workfn
);
2843 dev
->pci_dev
= pdev
;
2844 pci_set_drvdata(pdev
, dev
);
2845 result
= nvme_set_instance(dev
);
2849 result
= nvme_setup_prp_pools(dev
);
2853 kref_init(&dev
->kref
);
2854 result
= nvme_dev_start(dev
);
2858 if (dev
->online_queues
> 1)
2859 result
= nvme_dev_add(dev
);
2863 scnprintf(dev
->name
, sizeof(dev
->name
), "nvme%d", dev
->instance
);
2864 dev
->miscdev
.minor
= MISC_DYNAMIC_MINOR
;
2865 dev
->miscdev
.parent
= &pdev
->dev
;
2866 dev
->miscdev
.name
= dev
->name
;
2867 dev
->miscdev
.fops
= &nvme_dev_fops
;
2868 result
= misc_register(&dev
->miscdev
);
2872 dev
->initialized
= 1;
2876 nvme_dev_remove(dev
);
2877 nvme_free_namespaces(dev
);
2879 nvme_dev_shutdown(dev
);
2881 nvme_free_queues(dev
, 0);
2882 nvme_release_prp_pools(dev
);
2884 nvme_release_instance(dev
);
2886 free_percpu(dev
->io_queue
);
2893 static void nvme_reset_notify(struct pci_dev
*pdev
, bool prepare
)
2895 struct nvme_dev
*dev
= pci_get_drvdata(pdev
);
2898 nvme_dev_shutdown(dev
);
2900 nvme_dev_resume(dev
);
2903 static void nvme_shutdown(struct pci_dev
*pdev
)
2905 struct nvme_dev
*dev
= pci_get_drvdata(pdev
);
2906 nvme_dev_shutdown(dev
);
2909 static void nvme_remove(struct pci_dev
*pdev
)
2911 struct nvme_dev
*dev
= pci_get_drvdata(pdev
);
2913 spin_lock(&dev_list_lock
);
2914 list_del_init(&dev
->node
);
2915 spin_unlock(&dev_list_lock
);
2917 pci_set_drvdata(pdev
, NULL
);
2918 flush_work(&dev
->reset_work
);
2919 flush_work(&dev
->cpu_work
);
2920 misc_deregister(&dev
->miscdev
);
2921 nvme_dev_remove(dev
);
2922 nvme_dev_shutdown(dev
);
2923 nvme_free_queues(dev
, 0);
2925 nvme_release_instance(dev
);
2926 nvme_release_prp_pools(dev
);
2927 kref_put(&dev
->kref
, nvme_free_dev
);
2930 /* These functions are yet to be implemented */
2931 #define nvme_error_detected NULL
2932 #define nvme_dump_registers NULL
2933 #define nvme_link_reset NULL
2934 #define nvme_slot_reset NULL
2935 #define nvme_error_resume NULL
2937 #ifdef CONFIG_PM_SLEEP
2938 static int nvme_suspend(struct device
*dev
)
2940 struct pci_dev
*pdev
= to_pci_dev(dev
);
2941 struct nvme_dev
*ndev
= pci_get_drvdata(pdev
);
2943 nvme_dev_shutdown(ndev
);
2947 static int nvme_resume(struct device
*dev
)
2949 struct pci_dev
*pdev
= to_pci_dev(dev
);
2950 struct nvme_dev
*ndev
= pci_get_drvdata(pdev
);
2952 if (nvme_dev_resume(ndev
) && !work_busy(&ndev
->reset_work
)) {
2953 ndev
->reset_workfn
= nvme_reset_failed_dev
;
2954 queue_work(nvme_workq
, &ndev
->reset_work
);
2960 static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops
, nvme_suspend
, nvme_resume
);
2962 static const struct pci_error_handlers nvme_err_handler
= {
2963 .error_detected
= nvme_error_detected
,
2964 .mmio_enabled
= nvme_dump_registers
,
2965 .link_reset
= nvme_link_reset
,
2966 .slot_reset
= nvme_slot_reset
,
2967 .resume
= nvme_error_resume
,
2968 .reset_notify
= nvme_reset_notify
,
2971 /* Move to pci_ids.h later */
2972 #define PCI_CLASS_STORAGE_EXPRESS 0x010802
2974 static const struct pci_device_id nvme_id_table
[] = {
2975 { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS
, 0xffffff) },
2978 MODULE_DEVICE_TABLE(pci
, nvme_id_table
);
2980 static struct pci_driver nvme_driver
= {
2982 .id_table
= nvme_id_table
,
2983 .probe
= nvme_probe
,
2984 .remove
= nvme_remove
,
2985 .shutdown
= nvme_shutdown
,
2987 .pm
= &nvme_dev_pm_ops
,
2989 .err_handler
= &nvme_err_handler
,
2992 static int __init
nvme_init(void)
2996 init_waitqueue_head(&nvme_kthread_wait
);
2998 nvme_workq
= create_singlethread_workqueue("nvme");
3002 result
= register_blkdev(nvme_major
, "nvme");
3005 else if (result
> 0)
3006 nvme_major
= result
;
3008 nvme_nb
.notifier_call
= &nvme_cpu_notify
;
3009 result
= register_hotcpu_notifier(&nvme_nb
);
3011 goto unregister_blkdev
;
3013 result
= pci_register_driver(&nvme_driver
);
3015 goto unregister_hotcpu
;
3019 unregister_hotcpu_notifier(&nvme_nb
);
3021 unregister_blkdev(nvme_major
, "nvme");
3023 destroy_workqueue(nvme_workq
);
3027 static void __exit
nvme_exit(void)
3029 pci_unregister_driver(&nvme_driver
);
3030 unregister_hotcpu_notifier(&nvme_nb
);
3031 unregister_blkdev(nvme_major
, "nvme");
3032 destroy_workqueue(nvme_workq
);
3033 BUG_ON(nvme_thread
&& !IS_ERR(nvme_thread
));
3037 MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>");
3038 MODULE_LICENSE("GPL");
3039 MODULE_VERSION("0.9");
3040 module_init(nvme_init
);
3041 module_exit(nvme_exit
);