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 SHUTDOWN_TIMEOUT (shutdown_timeout * HZ)
52 #define IOD_TIMEOUT (retry_time * HZ)
54 static unsigned char admin_timeout
= 60;
55 module_param(admin_timeout
, byte
, 0644);
56 MODULE_PARM_DESC(admin_timeout
, "timeout in seconds for admin commands");
58 unsigned char nvme_io_timeout
= 30;
59 module_param_named(io_timeout
, nvme_io_timeout
, byte
, 0644);
60 MODULE_PARM_DESC(io_timeout
, "timeout in seconds for I/O");
62 static unsigned char retry_time
= 30;
63 module_param(retry_time
, byte
, 0644);
64 MODULE_PARM_DESC(retry_time
, "time in seconds to retry failed I/O");
66 static unsigned char shutdown_timeout
= 5;
67 module_param(shutdown_timeout
, byte
, 0644);
68 MODULE_PARM_DESC(shutdown_timeout
, "timeout in seconds for controller shutdown");
70 static int nvme_major
;
71 module_param(nvme_major
, int, 0);
73 static int use_threaded_interrupts
;
74 module_param(use_threaded_interrupts
, int, 0);
76 static DEFINE_SPINLOCK(dev_list_lock
);
77 static LIST_HEAD(dev_list
);
78 static struct task_struct
*nvme_thread
;
79 static struct workqueue_struct
*nvme_workq
;
80 static wait_queue_head_t nvme_kthread_wait
;
81 static struct notifier_block nvme_nb
;
83 static void nvme_reset_failed_dev(struct work_struct
*ws
);
85 struct async_cmd_info
{
86 struct kthread_work work
;
87 struct kthread_worker
*worker
;
94 * An NVM Express queue. Each device has at least two (one for admin
95 * commands and one for I/O commands).
98 struct llist_node node
;
99 struct device
*q_dmadev
;
100 struct nvme_dev
*dev
;
101 char irqname
[24]; /* nvme4294967295-65535\0 */
103 struct nvme_command
*sq_cmds
;
104 volatile struct nvme_completion
*cqes
;
105 dma_addr_t sq_dma_addr
;
106 dma_addr_t cq_dma_addr
;
107 wait_queue_head_t sq_full
;
108 wait_queue_t sq_cong_wait
;
109 struct bio_list sq_cong
;
110 struct list_head iod_bio
;
121 cpumask_var_t cpu_mask
;
122 struct async_cmd_info cmdinfo
;
123 unsigned long cmdid_data
[];
127 * Check we didin't inadvertently grow the command struct
129 static inline void _nvme_check_size(void)
131 BUILD_BUG_ON(sizeof(struct nvme_rw_command
) != 64);
132 BUILD_BUG_ON(sizeof(struct nvme_create_cq
) != 64);
133 BUILD_BUG_ON(sizeof(struct nvme_create_sq
) != 64);
134 BUILD_BUG_ON(sizeof(struct nvme_delete_queue
) != 64);
135 BUILD_BUG_ON(sizeof(struct nvme_features
) != 64);
136 BUILD_BUG_ON(sizeof(struct nvme_format_cmd
) != 64);
137 BUILD_BUG_ON(sizeof(struct nvme_abort_cmd
) != 64);
138 BUILD_BUG_ON(sizeof(struct nvme_command
) != 64);
139 BUILD_BUG_ON(sizeof(struct nvme_id_ctrl
) != 4096);
140 BUILD_BUG_ON(sizeof(struct nvme_id_ns
) != 4096);
141 BUILD_BUG_ON(sizeof(struct nvme_lba_range_type
) != 64);
142 BUILD_BUG_ON(sizeof(struct nvme_smart_log
) != 512);
145 typedef void (*nvme_completion_fn
)(struct nvme_queue
*, void *,
146 struct nvme_completion
*);
148 struct nvme_cmd_info
{
149 nvme_completion_fn fn
;
151 unsigned long timeout
;
155 static struct nvme_cmd_info
*nvme_cmd_info(struct nvme_queue
*nvmeq
)
157 return (void *)&nvmeq
->cmdid_data
[BITS_TO_LONGS(nvmeq
->q_depth
)];
160 static unsigned nvme_queue_extra(int depth
)
162 return DIV_ROUND_UP(depth
, 8) + (depth
* sizeof(struct nvme_cmd_info
));
166 * alloc_cmdid() - Allocate a Command ID
167 * @nvmeq: The queue that will be used for this command
168 * @ctx: A pointer that will be passed to the handler
169 * @handler: The function to call on completion
171 * Allocate a Command ID for a queue. The data passed in will
172 * be passed to the completion handler. This is implemented by using
173 * the bottom two bits of the ctx pointer to store the handler ID.
174 * Passing in a pointer that's not 4-byte aligned will cause a BUG.
175 * We can change this if it becomes a problem.
177 * May be called with local interrupts disabled and the q_lock held,
178 * or with interrupts enabled and no locks held.
180 static int alloc_cmdid(struct nvme_queue
*nvmeq
, void *ctx
,
181 nvme_completion_fn handler
, unsigned timeout
)
183 int depth
= nvmeq
->q_depth
- 1;
184 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
188 cmdid
= find_first_zero_bit(nvmeq
->cmdid_data
, depth
);
191 } while (test_and_set_bit(cmdid
, nvmeq
->cmdid_data
));
193 info
[cmdid
].fn
= handler
;
194 info
[cmdid
].ctx
= ctx
;
195 info
[cmdid
].timeout
= jiffies
+ timeout
;
196 info
[cmdid
].aborted
= 0;
200 static int alloc_cmdid_killable(struct nvme_queue
*nvmeq
, void *ctx
,
201 nvme_completion_fn handler
, unsigned timeout
)
204 wait_event_killable(nvmeq
->sq_full
,
205 (cmdid
= alloc_cmdid(nvmeq
, ctx
, handler
, timeout
)) >= 0);
206 return (cmdid
< 0) ? -EINTR
: cmdid
;
209 /* Special values must be less than 0x1000 */
210 #define CMD_CTX_BASE ((void *)POISON_POINTER_DELTA)
211 #define CMD_CTX_CANCELLED (0x30C + CMD_CTX_BASE)
212 #define CMD_CTX_COMPLETED (0x310 + CMD_CTX_BASE)
213 #define CMD_CTX_INVALID (0x314 + CMD_CTX_BASE)
214 #define CMD_CTX_ABORT (0x318 + CMD_CTX_BASE)
215 #define CMD_CTX_ASYNC (0x31C + CMD_CTX_BASE)
217 static void special_completion(struct nvme_queue
*nvmeq
, void *ctx
,
218 struct nvme_completion
*cqe
)
220 if (ctx
== CMD_CTX_CANCELLED
)
222 if (ctx
== CMD_CTX_ABORT
) {
223 ++nvmeq
->dev
->abort_limit
;
226 if (ctx
== CMD_CTX_COMPLETED
) {
227 dev_warn(nvmeq
->q_dmadev
,
228 "completed id %d twice on queue %d\n",
229 cqe
->command_id
, le16_to_cpup(&cqe
->sq_id
));
232 if (ctx
== CMD_CTX_INVALID
) {
233 dev_warn(nvmeq
->q_dmadev
,
234 "invalid id %d completed on queue %d\n",
235 cqe
->command_id
, le16_to_cpup(&cqe
->sq_id
));
238 if (ctx
== CMD_CTX_ASYNC
) {
239 u32 result
= le32_to_cpup(&cqe
->result
);
240 u16 status
= le16_to_cpup(&cqe
->status
) >> 1;
242 if (status
== NVME_SC_SUCCESS
|| status
== NVME_SC_ABORT_REQ
)
243 ++nvmeq
->dev
->event_limit
;
244 if (status
== NVME_SC_SUCCESS
)
245 dev_warn(nvmeq
->q_dmadev
,
246 "async event result %08x\n", result
);
250 dev_warn(nvmeq
->q_dmadev
, "Unknown special completion %p\n", ctx
);
253 static void async_completion(struct nvme_queue
*nvmeq
, void *ctx
,
254 struct nvme_completion
*cqe
)
256 struct async_cmd_info
*cmdinfo
= ctx
;
257 cmdinfo
->result
= le32_to_cpup(&cqe
->result
);
258 cmdinfo
->status
= le16_to_cpup(&cqe
->status
) >> 1;
259 queue_kthread_work(cmdinfo
->worker
, &cmdinfo
->work
);
263 * Called with local interrupts disabled and the q_lock held. May not sleep.
265 static void *free_cmdid(struct nvme_queue
*nvmeq
, int cmdid
,
266 nvme_completion_fn
*fn
)
269 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
271 if (cmdid
>= nvmeq
->q_depth
|| !info
[cmdid
].fn
) {
273 *fn
= special_completion
;
274 return CMD_CTX_INVALID
;
277 *fn
= info
[cmdid
].fn
;
278 ctx
= info
[cmdid
].ctx
;
279 info
[cmdid
].fn
= special_completion
;
280 info
[cmdid
].ctx
= CMD_CTX_COMPLETED
;
281 clear_bit(cmdid
, nvmeq
->cmdid_data
);
282 wake_up(&nvmeq
->sq_full
);
286 static void *cancel_cmdid(struct nvme_queue
*nvmeq
, int cmdid
,
287 nvme_completion_fn
*fn
)
290 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
292 *fn
= info
[cmdid
].fn
;
293 ctx
= info
[cmdid
].ctx
;
294 info
[cmdid
].fn
= special_completion
;
295 info
[cmdid
].ctx
= CMD_CTX_CANCELLED
;
299 static struct nvme_queue
*raw_nvmeq(struct nvme_dev
*dev
, int qid
)
301 return rcu_dereference_raw(dev
->queues
[qid
]);
304 static struct nvme_queue
*get_nvmeq(struct nvme_dev
*dev
) __acquires(RCU
)
306 struct nvme_queue
*nvmeq
;
307 unsigned queue_id
= get_cpu_var(*dev
->io_queue
);
310 nvmeq
= rcu_dereference(dev
->queues
[queue_id
]);
315 put_cpu_var(*dev
->io_queue
);
319 static void put_nvmeq(struct nvme_queue
*nvmeq
) __releases(RCU
)
322 put_cpu_var(nvmeq
->dev
->io_queue
);
325 static struct nvme_queue
*lock_nvmeq(struct nvme_dev
*dev
, int q_idx
)
328 struct nvme_queue
*nvmeq
;
331 nvmeq
= rcu_dereference(dev
->queues
[q_idx
]);
339 static void unlock_nvmeq(struct nvme_queue
*nvmeq
) __releases(RCU
)
345 * nvme_submit_cmd() - Copy a command into a queue and ring the doorbell
346 * @nvmeq: The queue to use
347 * @cmd: The command to send
349 * Safe to use from interrupt context
351 static int nvme_submit_cmd(struct nvme_queue
*nvmeq
, struct nvme_command
*cmd
)
355 spin_lock_irqsave(&nvmeq
->q_lock
, flags
);
356 if (nvmeq
->q_suspended
) {
357 spin_unlock_irqrestore(&nvmeq
->q_lock
, flags
);
360 tail
= nvmeq
->sq_tail
;
361 memcpy(&nvmeq
->sq_cmds
[tail
], cmd
, sizeof(*cmd
));
362 if (++tail
== nvmeq
->q_depth
)
364 writel(tail
, nvmeq
->q_db
);
365 nvmeq
->sq_tail
= tail
;
366 spin_unlock_irqrestore(&nvmeq
->q_lock
, flags
);
371 static __le64
**iod_list(struct nvme_iod
*iod
)
373 return ((void *)iod
) + iod
->offset
;
377 * Will slightly overestimate the number of pages needed. This is OK
378 * as it only leads to a small amount of wasted memory for the lifetime of
381 static int nvme_npages(unsigned size
, struct nvme_dev
*dev
)
383 unsigned nprps
= DIV_ROUND_UP(size
+ dev
->page_size
, dev
->page_size
);
384 return DIV_ROUND_UP(8 * nprps
, dev
->page_size
- 8);
387 static struct nvme_iod
*
388 nvme_alloc_iod(unsigned nseg
, unsigned nbytes
, struct nvme_dev
*dev
, gfp_t gfp
)
390 struct nvme_iod
*iod
= kmalloc(sizeof(struct nvme_iod
) +
391 sizeof(__le64
*) * nvme_npages(nbytes
, dev
) +
392 sizeof(struct scatterlist
) * nseg
, gfp
);
395 iod
->offset
= offsetof(struct nvme_iod
, sg
[nseg
]);
397 iod
->length
= nbytes
;
399 iod
->first_dma
= 0ULL;
400 iod
->start_time
= jiffies
;
406 void nvme_free_iod(struct nvme_dev
*dev
, struct nvme_iod
*iod
)
408 const int last_prp
= dev
->page_size
/ 8 - 1;
410 __le64
**list
= iod_list(iod
);
411 dma_addr_t prp_dma
= iod
->first_dma
;
413 if (iod
->npages
== 0)
414 dma_pool_free(dev
->prp_small_pool
, list
[0], prp_dma
);
415 for (i
= 0; i
< iod
->npages
; i
++) {
416 __le64
*prp_list
= list
[i
];
417 dma_addr_t next_prp_dma
= le64_to_cpu(prp_list
[last_prp
]);
418 dma_pool_free(dev
->prp_page_pool
, prp_list
, prp_dma
);
419 prp_dma
= next_prp_dma
;
424 static void nvme_start_io_acct(struct bio
*bio
)
426 struct gendisk
*disk
= bio
->bi_bdev
->bd_disk
;
427 if (blk_queue_io_stat(disk
->queue
)) {
428 const int rw
= bio_data_dir(bio
);
429 int cpu
= part_stat_lock();
430 part_round_stats(cpu
, &disk
->part0
);
431 part_stat_inc(cpu
, &disk
->part0
, ios
[rw
]);
432 part_stat_add(cpu
, &disk
->part0
, sectors
[rw
],
434 part_inc_in_flight(&disk
->part0
, rw
);
439 static void nvme_end_io_acct(struct bio
*bio
, unsigned long start_time
)
441 struct gendisk
*disk
= bio
->bi_bdev
->bd_disk
;
442 if (blk_queue_io_stat(disk
->queue
)) {
443 const int rw
= bio_data_dir(bio
);
444 unsigned long duration
= jiffies
- start_time
;
445 int cpu
= part_stat_lock();
446 part_stat_add(cpu
, &disk
->part0
, ticks
[rw
], duration
);
447 part_round_stats(cpu
, &disk
->part0
);
448 part_dec_in_flight(&disk
->part0
, rw
);
453 static int nvme_error_status(u16 status
)
455 switch (status
& 0x7ff) {
456 case NVME_SC_SUCCESS
:
458 case NVME_SC_CAP_EXCEEDED
:
465 static void bio_completion(struct nvme_queue
*nvmeq
, void *ctx
,
466 struct nvme_completion
*cqe
)
468 struct nvme_iod
*iod
= ctx
;
469 struct bio
*bio
= iod
->private;
470 u16 status
= le16_to_cpup(&cqe
->status
) >> 1;
473 if (unlikely(status
)) {
474 if (!(status
& NVME_SC_DNR
||
475 bio
->bi_rw
& REQ_FAILFAST_MASK
) &&
476 (jiffies
- iod
->start_time
) < IOD_TIMEOUT
) {
477 if (!waitqueue_active(&nvmeq
->sq_full
))
478 add_wait_queue(&nvmeq
->sq_full
,
479 &nvmeq
->sq_cong_wait
);
480 list_add_tail(&iod
->node
, &nvmeq
->iod_bio
);
481 wake_up(&nvmeq
->sq_full
);
484 error
= nvme_error_status(status
);
487 dma_unmap_sg(nvmeq
->q_dmadev
, iod
->sg
, iod
->nents
,
488 bio_data_dir(bio
) ? DMA_TO_DEVICE
: DMA_FROM_DEVICE
);
489 nvme_end_io_acct(bio
, iod
->start_time
);
491 nvme_free_iod(nvmeq
->dev
, iod
);
493 trace_block_bio_complete(bdev_get_queue(bio
->bi_bdev
), bio
, error
);
494 bio_endio(bio
, error
);
497 /* length is in bytes. gfp flags indicates whether we may sleep. */
498 int nvme_setup_prps(struct nvme_dev
*dev
, struct nvme_iod
*iod
, int total_len
,
501 struct dma_pool
*pool
;
502 int length
= total_len
;
503 struct scatterlist
*sg
= iod
->sg
;
504 int dma_len
= sg_dma_len(sg
);
505 u64 dma_addr
= sg_dma_address(sg
);
506 int offset
= offset_in_page(dma_addr
);
508 __le64
**list
= iod_list(iod
);
511 u32 page_size
= dev
->page_size
;
513 length
-= (page_size
- offset
);
517 dma_len
-= (page_size
- offset
);
519 dma_addr
+= (page_size
- offset
);
522 dma_addr
= sg_dma_address(sg
);
523 dma_len
= sg_dma_len(sg
);
526 if (length
<= page_size
) {
527 iod
->first_dma
= dma_addr
;
531 nprps
= DIV_ROUND_UP(length
, page_size
);
532 if (nprps
<= (256 / 8)) {
533 pool
= dev
->prp_small_pool
;
536 pool
= dev
->prp_page_pool
;
540 prp_list
= dma_pool_alloc(pool
, gfp
, &prp_dma
);
542 iod
->first_dma
= dma_addr
;
544 return (total_len
- length
) + page_size
;
547 iod
->first_dma
= prp_dma
;
550 if (i
== page_size
>> 3) {
551 __le64
*old_prp_list
= prp_list
;
552 prp_list
= dma_pool_alloc(pool
, gfp
, &prp_dma
);
554 return total_len
- length
;
555 list
[iod
->npages
++] = prp_list
;
556 prp_list
[0] = old_prp_list
[i
- 1];
557 old_prp_list
[i
- 1] = cpu_to_le64(prp_dma
);
560 prp_list
[i
++] = cpu_to_le64(dma_addr
);
561 dma_len
-= page_size
;
562 dma_addr
+= page_size
;
570 dma_addr
= sg_dma_address(sg
);
571 dma_len
= sg_dma_len(sg
);
577 static int nvme_split_and_submit(struct bio
*bio
, struct nvme_queue
*nvmeq
,
580 struct bio
*split
= bio_split(bio
, len
>> 9, GFP_ATOMIC
, NULL
);
584 trace_block_split(bdev_get_queue(bio
->bi_bdev
), bio
,
585 split
->bi_iter
.bi_sector
);
586 bio_chain(split
, bio
);
588 if (!waitqueue_active(&nvmeq
->sq_full
))
589 add_wait_queue(&nvmeq
->sq_full
, &nvmeq
->sq_cong_wait
);
590 bio_list_add(&nvmeq
->sq_cong
, split
);
591 bio_list_add(&nvmeq
->sq_cong
, bio
);
592 wake_up(&nvmeq
->sq_full
);
597 /* NVMe scatterlists require no holes in the virtual address */
598 #define BIOVEC_NOT_VIRT_MERGEABLE(vec1, vec2) ((vec2)->bv_offset || \
599 (((vec1)->bv_offset + (vec1)->bv_len) % PAGE_SIZE))
601 static int nvme_map_bio(struct nvme_queue
*nvmeq
, struct nvme_iod
*iod
,
602 struct bio
*bio
, enum dma_data_direction dma_dir
, int psegs
)
604 struct bio_vec bvec
, bvprv
;
605 struct bvec_iter iter
;
606 struct scatterlist
*sg
= NULL
;
607 int length
= 0, nsegs
= 0, split_len
= bio
->bi_iter
.bi_size
;
610 if (nvmeq
->dev
->stripe_size
)
611 split_len
= nvmeq
->dev
->stripe_size
-
612 ((bio
->bi_iter
.bi_sector
<< 9) &
613 (nvmeq
->dev
->stripe_size
- 1));
615 sg_init_table(iod
->sg
, psegs
);
616 bio_for_each_segment(bvec
, bio
, iter
) {
617 if (!first
&& BIOVEC_PHYS_MERGEABLE(&bvprv
, &bvec
)) {
618 sg
->length
+= bvec
.bv_len
;
620 if (!first
&& BIOVEC_NOT_VIRT_MERGEABLE(&bvprv
, &bvec
))
621 return nvme_split_and_submit(bio
, nvmeq
,
624 sg
= sg
? sg
+ 1 : iod
->sg
;
625 sg_set_page(sg
, bvec
.bv_page
,
626 bvec
.bv_len
, bvec
.bv_offset
);
630 if (split_len
- length
< bvec
.bv_len
)
631 return nvme_split_and_submit(bio
, nvmeq
, split_len
);
632 length
+= bvec
.bv_len
;
638 if (dma_map_sg(nvmeq
->q_dmadev
, iod
->sg
, iod
->nents
, dma_dir
) == 0)
641 BUG_ON(length
!= bio
->bi_iter
.bi_size
);
645 static int nvme_submit_discard(struct nvme_queue
*nvmeq
, struct nvme_ns
*ns
,
646 struct bio
*bio
, struct nvme_iod
*iod
, int cmdid
)
648 struct nvme_dsm_range
*range
=
649 (struct nvme_dsm_range
*)iod_list(iod
)[0];
650 struct nvme_command
*cmnd
= &nvmeq
->sq_cmds
[nvmeq
->sq_tail
];
652 range
->cattr
= cpu_to_le32(0);
653 range
->nlb
= cpu_to_le32(bio
->bi_iter
.bi_size
>> ns
->lba_shift
);
654 range
->slba
= cpu_to_le64(nvme_block_nr(ns
, bio
->bi_iter
.bi_sector
));
656 memset(cmnd
, 0, sizeof(*cmnd
));
657 cmnd
->dsm
.opcode
= nvme_cmd_dsm
;
658 cmnd
->dsm
.command_id
= cmdid
;
659 cmnd
->dsm
.nsid
= cpu_to_le32(ns
->ns_id
);
660 cmnd
->dsm
.prp1
= cpu_to_le64(iod
->first_dma
);
662 cmnd
->dsm
.attributes
= cpu_to_le32(NVME_DSMGMT_AD
);
664 if (++nvmeq
->sq_tail
== nvmeq
->q_depth
)
666 writel(nvmeq
->sq_tail
, nvmeq
->q_db
);
671 static int nvme_submit_flush(struct nvme_queue
*nvmeq
, struct nvme_ns
*ns
,
674 struct nvme_command
*cmnd
= &nvmeq
->sq_cmds
[nvmeq
->sq_tail
];
676 memset(cmnd
, 0, sizeof(*cmnd
));
677 cmnd
->common
.opcode
= nvme_cmd_flush
;
678 cmnd
->common
.command_id
= cmdid
;
679 cmnd
->common
.nsid
= cpu_to_le32(ns
->ns_id
);
681 if (++nvmeq
->sq_tail
== nvmeq
->q_depth
)
683 writel(nvmeq
->sq_tail
, nvmeq
->q_db
);
688 static int nvme_submit_iod(struct nvme_queue
*nvmeq
, struct nvme_iod
*iod
)
690 struct bio
*bio
= iod
->private;
691 struct nvme_ns
*ns
= bio
->bi_bdev
->bd_disk
->private_data
;
692 struct nvme_command
*cmnd
;
697 cmdid
= alloc_cmdid(nvmeq
, iod
, bio_completion
, NVME_IO_TIMEOUT
);
698 if (unlikely(cmdid
< 0))
701 if (bio
->bi_rw
& REQ_DISCARD
)
702 return nvme_submit_discard(nvmeq
, ns
, bio
, iod
, cmdid
);
703 if (bio
->bi_rw
& REQ_FLUSH
)
704 return nvme_submit_flush(nvmeq
, ns
, cmdid
);
707 if (bio
->bi_rw
& REQ_FUA
)
708 control
|= NVME_RW_FUA
;
709 if (bio
->bi_rw
& (REQ_FAILFAST_DEV
| REQ_RAHEAD
))
710 control
|= NVME_RW_LR
;
713 if (bio
->bi_rw
& REQ_RAHEAD
)
714 dsmgmt
|= NVME_RW_DSM_FREQ_PREFETCH
;
716 cmnd
= &nvmeq
->sq_cmds
[nvmeq
->sq_tail
];
717 memset(cmnd
, 0, sizeof(*cmnd
));
719 cmnd
->rw
.opcode
= bio_data_dir(bio
) ? nvme_cmd_write
: nvme_cmd_read
;
720 cmnd
->rw
.command_id
= cmdid
;
721 cmnd
->rw
.nsid
= cpu_to_le32(ns
->ns_id
);
722 cmnd
->rw
.prp1
= cpu_to_le64(sg_dma_address(iod
->sg
));
723 cmnd
->rw
.prp2
= cpu_to_le64(iod
->first_dma
);
724 cmnd
->rw
.slba
= cpu_to_le64(nvme_block_nr(ns
, bio
->bi_iter
.bi_sector
));
726 cpu_to_le16((bio
->bi_iter
.bi_size
>> ns
->lba_shift
) - 1);
727 cmnd
->rw
.control
= cpu_to_le16(control
);
728 cmnd
->rw
.dsmgmt
= cpu_to_le32(dsmgmt
);
730 if (++nvmeq
->sq_tail
== nvmeq
->q_depth
)
732 writel(nvmeq
->sq_tail
, nvmeq
->q_db
);
737 static int nvme_split_flush_data(struct nvme_queue
*nvmeq
, struct bio
*bio
)
739 struct bio
*split
= bio_clone(bio
, GFP_ATOMIC
);
743 split
->bi_iter
.bi_size
= 0;
744 split
->bi_phys_segments
= 0;
745 bio
->bi_rw
&= ~REQ_FLUSH
;
746 bio_chain(split
, bio
);
748 if (!waitqueue_active(&nvmeq
->sq_full
))
749 add_wait_queue(&nvmeq
->sq_full
, &nvmeq
->sq_cong_wait
);
750 bio_list_add(&nvmeq
->sq_cong
, split
);
751 bio_list_add(&nvmeq
->sq_cong
, bio
);
752 wake_up_process(nvme_thread
);
758 * Called with local interrupts disabled and the q_lock held. May not sleep.
760 static int nvme_submit_bio_queue(struct nvme_queue
*nvmeq
, struct nvme_ns
*ns
,
763 struct nvme_iod
*iod
;
764 int psegs
= bio_phys_segments(ns
->queue
, bio
);
766 unsigned size
= !(bio
->bi_rw
& REQ_DISCARD
) ? bio
->bi_iter
.bi_size
:
767 sizeof(struct nvme_dsm_range
);
769 if ((bio
->bi_rw
& REQ_FLUSH
) && psegs
)
770 return nvme_split_flush_data(nvmeq
, bio
);
772 iod
= nvme_alloc_iod(psegs
, size
, ns
->dev
, GFP_ATOMIC
);
777 if (bio
->bi_rw
& REQ_DISCARD
) {
780 * We reuse the small pool to allocate the 16-byte range here
781 * as it is not worth having a special pool for these or
782 * additional cases to handle freeing the iod.
784 range
= dma_pool_alloc(nvmeq
->dev
->prp_small_pool
,
791 iod_list(iod
)[0] = (__le64
*)range
;
794 result
= nvme_map_bio(nvmeq
, iod
, bio
,
795 bio_data_dir(bio
) ? DMA_TO_DEVICE
: DMA_FROM_DEVICE
,
799 if (nvme_setup_prps(nvmeq
->dev
, iod
, result
, GFP_ATOMIC
) !=
804 nvme_start_io_acct(bio
);
806 if (unlikely(nvme_submit_iod(nvmeq
, iod
))) {
807 if (!waitqueue_active(&nvmeq
->sq_full
))
808 add_wait_queue(&nvmeq
->sq_full
, &nvmeq
->sq_cong_wait
);
809 list_add_tail(&iod
->node
, &nvmeq
->iod_bio
);
814 nvme_free_iod(nvmeq
->dev
, iod
);
818 static int nvme_process_cq(struct nvme_queue
*nvmeq
)
822 head
= nvmeq
->cq_head
;
823 phase
= nvmeq
->cq_phase
;
827 nvme_completion_fn fn
;
828 struct nvme_completion cqe
= nvmeq
->cqes
[head
];
829 if ((le16_to_cpu(cqe
.status
) & 1) != phase
)
831 nvmeq
->sq_head
= le16_to_cpu(cqe
.sq_head
);
832 if (++head
== nvmeq
->q_depth
) {
837 ctx
= free_cmdid(nvmeq
, cqe
.command_id
, &fn
);
838 fn(nvmeq
, ctx
, &cqe
);
841 /* If the controller ignores the cq head doorbell and continuously
842 * writes to the queue, it is theoretically possible to wrap around
843 * the queue twice and mistakenly return IRQ_NONE. Linux only
844 * requires that 0.1% of your interrupts are handled, so this isn't
847 if (head
== nvmeq
->cq_head
&& phase
== nvmeq
->cq_phase
)
850 writel(head
, nvmeq
->q_db
+ nvmeq
->dev
->db_stride
);
851 nvmeq
->cq_head
= head
;
852 nvmeq
->cq_phase
= phase
;
858 static void nvme_make_request(struct request_queue
*q
, struct bio
*bio
)
860 struct nvme_ns
*ns
= q
->queuedata
;
861 struct nvme_queue
*nvmeq
= get_nvmeq(ns
->dev
);
865 bio_endio(bio
, -EIO
);
869 spin_lock_irq(&nvmeq
->q_lock
);
870 if (!nvmeq
->q_suspended
&& bio_list_empty(&nvmeq
->sq_cong
))
871 result
= nvme_submit_bio_queue(nvmeq
, ns
, bio
);
872 if (unlikely(result
)) {
873 if (!waitqueue_active(&nvmeq
->sq_full
))
874 add_wait_queue(&nvmeq
->sq_full
, &nvmeq
->sq_cong_wait
);
875 bio_list_add(&nvmeq
->sq_cong
, bio
);
878 nvme_process_cq(nvmeq
);
879 spin_unlock_irq(&nvmeq
->q_lock
);
883 static irqreturn_t
nvme_irq(int irq
, void *data
)
886 struct nvme_queue
*nvmeq
= data
;
887 spin_lock(&nvmeq
->q_lock
);
888 nvme_process_cq(nvmeq
);
889 result
= nvmeq
->cqe_seen
? IRQ_HANDLED
: IRQ_NONE
;
891 spin_unlock(&nvmeq
->q_lock
);
895 static irqreturn_t
nvme_irq_check(int irq
, void *data
)
897 struct nvme_queue
*nvmeq
= data
;
898 struct nvme_completion cqe
= nvmeq
->cqes
[nvmeq
->cq_head
];
899 if ((le16_to_cpu(cqe
.status
) & 1) != nvmeq
->cq_phase
)
901 return IRQ_WAKE_THREAD
;
904 static void nvme_abort_command(struct nvme_queue
*nvmeq
, int cmdid
)
906 spin_lock_irq(&nvmeq
->q_lock
);
907 cancel_cmdid(nvmeq
, cmdid
, NULL
);
908 spin_unlock_irq(&nvmeq
->q_lock
);
911 struct sync_cmd_info
{
912 struct task_struct
*task
;
917 static void sync_completion(struct nvme_queue
*nvmeq
, void *ctx
,
918 struct nvme_completion
*cqe
)
920 struct sync_cmd_info
*cmdinfo
= ctx
;
921 cmdinfo
->result
= le32_to_cpup(&cqe
->result
);
922 cmdinfo
->status
= le16_to_cpup(&cqe
->status
) >> 1;
923 wake_up_process(cmdinfo
->task
);
927 * Returns 0 on success. If the result is negative, it's a Linux error code;
928 * if the result is positive, it's an NVM Express status code
930 static int nvme_submit_sync_cmd(struct nvme_dev
*dev
, int q_idx
,
931 struct nvme_command
*cmd
,
932 u32
*result
, unsigned timeout
)
935 struct sync_cmd_info cmdinfo
;
936 struct nvme_queue
*nvmeq
;
938 nvmeq
= lock_nvmeq(dev
, q_idx
);
942 cmdinfo
.task
= current
;
943 cmdinfo
.status
= -EINTR
;
945 cmdid
= alloc_cmdid(nvmeq
, &cmdinfo
, sync_completion
, timeout
);
950 cmd
->common
.command_id
= cmdid
;
952 set_current_state(TASK_KILLABLE
);
953 ret
= nvme_submit_cmd(nvmeq
, cmd
);
955 free_cmdid(nvmeq
, cmdid
, NULL
);
957 set_current_state(TASK_RUNNING
);
961 schedule_timeout(timeout
);
963 if (cmdinfo
.status
== -EINTR
) {
964 nvmeq
= lock_nvmeq(dev
, q_idx
);
966 nvme_abort_command(nvmeq
, cmdid
);
973 *result
= cmdinfo
.result
;
975 return cmdinfo
.status
;
978 static int nvme_submit_async_cmd(struct nvme_queue
*nvmeq
,
979 struct nvme_command
*cmd
,
980 struct async_cmd_info
*cmdinfo
, unsigned timeout
)
984 cmdid
= alloc_cmdid_killable(nvmeq
, cmdinfo
, async_completion
, timeout
);
987 cmdinfo
->status
= -EINTR
;
988 cmd
->common
.command_id
= cmdid
;
989 return nvme_submit_cmd(nvmeq
, cmd
);
992 int nvme_submit_admin_cmd(struct nvme_dev
*dev
, struct nvme_command
*cmd
,
995 return nvme_submit_sync_cmd(dev
, 0, cmd
, result
, ADMIN_TIMEOUT
);
998 int nvme_submit_io_cmd(struct nvme_dev
*dev
, struct nvme_command
*cmd
,
1001 return nvme_submit_sync_cmd(dev
, this_cpu_read(*dev
->io_queue
), cmd
,
1002 result
, NVME_IO_TIMEOUT
);
1005 static int nvme_submit_admin_cmd_async(struct nvme_dev
*dev
,
1006 struct nvme_command
*cmd
, struct async_cmd_info
*cmdinfo
)
1008 return nvme_submit_async_cmd(raw_nvmeq(dev
, 0), cmd
, cmdinfo
,
1012 static int adapter_delete_queue(struct nvme_dev
*dev
, u8 opcode
, u16 id
)
1015 struct nvme_command c
;
1017 memset(&c
, 0, sizeof(c
));
1018 c
.delete_queue
.opcode
= opcode
;
1019 c
.delete_queue
.qid
= cpu_to_le16(id
);
1021 status
= nvme_submit_admin_cmd(dev
, &c
, NULL
);
1027 static int adapter_alloc_cq(struct nvme_dev
*dev
, u16 qid
,
1028 struct nvme_queue
*nvmeq
)
1031 struct nvme_command c
;
1032 int flags
= NVME_QUEUE_PHYS_CONTIG
| NVME_CQ_IRQ_ENABLED
;
1034 memset(&c
, 0, sizeof(c
));
1035 c
.create_cq
.opcode
= nvme_admin_create_cq
;
1036 c
.create_cq
.prp1
= cpu_to_le64(nvmeq
->cq_dma_addr
);
1037 c
.create_cq
.cqid
= cpu_to_le16(qid
);
1038 c
.create_cq
.qsize
= cpu_to_le16(nvmeq
->q_depth
- 1);
1039 c
.create_cq
.cq_flags
= cpu_to_le16(flags
);
1040 c
.create_cq
.irq_vector
= cpu_to_le16(nvmeq
->cq_vector
);
1042 status
= nvme_submit_admin_cmd(dev
, &c
, NULL
);
1048 static int adapter_alloc_sq(struct nvme_dev
*dev
, u16 qid
,
1049 struct nvme_queue
*nvmeq
)
1052 struct nvme_command c
;
1053 int flags
= NVME_QUEUE_PHYS_CONTIG
| NVME_SQ_PRIO_MEDIUM
;
1055 memset(&c
, 0, sizeof(c
));
1056 c
.create_sq
.opcode
= nvme_admin_create_sq
;
1057 c
.create_sq
.prp1
= cpu_to_le64(nvmeq
->sq_dma_addr
);
1058 c
.create_sq
.sqid
= cpu_to_le16(qid
);
1059 c
.create_sq
.qsize
= cpu_to_le16(nvmeq
->q_depth
- 1);
1060 c
.create_sq
.sq_flags
= cpu_to_le16(flags
);
1061 c
.create_sq
.cqid
= cpu_to_le16(qid
);
1063 status
= nvme_submit_admin_cmd(dev
, &c
, NULL
);
1069 static int adapter_delete_cq(struct nvme_dev
*dev
, u16 cqid
)
1071 return adapter_delete_queue(dev
, nvme_admin_delete_cq
, cqid
);
1074 static int adapter_delete_sq(struct nvme_dev
*dev
, u16 sqid
)
1076 return adapter_delete_queue(dev
, nvme_admin_delete_sq
, sqid
);
1079 int nvme_identify(struct nvme_dev
*dev
, unsigned nsid
, unsigned cns
,
1080 dma_addr_t dma_addr
)
1082 struct nvme_command c
;
1084 memset(&c
, 0, sizeof(c
));
1085 c
.identify
.opcode
= nvme_admin_identify
;
1086 c
.identify
.nsid
= cpu_to_le32(nsid
);
1087 c
.identify
.prp1
= cpu_to_le64(dma_addr
);
1088 c
.identify
.cns
= cpu_to_le32(cns
);
1090 return nvme_submit_admin_cmd(dev
, &c
, NULL
);
1093 int nvme_get_features(struct nvme_dev
*dev
, unsigned fid
, unsigned nsid
,
1094 dma_addr_t dma_addr
, u32
*result
)
1096 struct nvme_command c
;
1098 memset(&c
, 0, sizeof(c
));
1099 c
.features
.opcode
= nvme_admin_get_features
;
1100 c
.features
.nsid
= cpu_to_le32(nsid
);
1101 c
.features
.prp1
= cpu_to_le64(dma_addr
);
1102 c
.features
.fid
= cpu_to_le32(fid
);
1104 return nvme_submit_admin_cmd(dev
, &c
, result
);
1107 int nvme_set_features(struct nvme_dev
*dev
, unsigned fid
, unsigned dword11
,
1108 dma_addr_t dma_addr
, u32
*result
)
1110 struct nvme_command c
;
1112 memset(&c
, 0, sizeof(c
));
1113 c
.features
.opcode
= nvme_admin_set_features
;
1114 c
.features
.prp1
= cpu_to_le64(dma_addr
);
1115 c
.features
.fid
= cpu_to_le32(fid
);
1116 c
.features
.dword11
= cpu_to_le32(dword11
);
1118 return nvme_submit_admin_cmd(dev
, &c
, result
);
1122 * nvme_abort_cmd - Attempt aborting a command
1123 * @cmdid: Command id of a timed out IO
1124 * @queue: The queue with timed out IO
1126 * Schedule controller reset if the command was already aborted once before and
1127 * still hasn't been returned to the driver, or if this is the admin queue.
1129 static void nvme_abort_cmd(int cmdid
, struct nvme_queue
*nvmeq
)
1132 struct nvme_command cmd
;
1133 struct nvme_dev
*dev
= nvmeq
->dev
;
1134 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
1135 struct nvme_queue
*adminq
;
1137 if (!nvmeq
->qid
|| info
[cmdid
].aborted
) {
1138 if (work_busy(&dev
->reset_work
))
1140 list_del_init(&dev
->node
);
1141 dev_warn(&dev
->pci_dev
->dev
,
1142 "I/O %d QID %d timeout, reset controller\n", cmdid
,
1144 dev
->reset_workfn
= nvme_reset_failed_dev
;
1145 queue_work(nvme_workq
, &dev
->reset_work
);
1149 if (!dev
->abort_limit
)
1152 adminq
= rcu_dereference(dev
->queues
[0]);
1153 a_cmdid
= alloc_cmdid(adminq
, CMD_CTX_ABORT
, special_completion
,
1158 memset(&cmd
, 0, sizeof(cmd
));
1159 cmd
.abort
.opcode
= nvme_admin_abort_cmd
;
1160 cmd
.abort
.cid
= cmdid
;
1161 cmd
.abort
.sqid
= cpu_to_le16(nvmeq
->qid
);
1162 cmd
.abort
.command_id
= a_cmdid
;
1165 info
[cmdid
].aborted
= 1;
1166 info
[cmdid
].timeout
= jiffies
+ ADMIN_TIMEOUT
;
1168 dev_warn(nvmeq
->q_dmadev
, "Aborting I/O %d QID %d\n", cmdid
,
1170 nvme_submit_cmd(adminq
, &cmd
);
1174 * nvme_cancel_ios - Cancel outstanding I/Os
1175 * @queue: The queue to cancel I/Os on
1176 * @timeout: True to only cancel I/Os which have timed out
1178 static void nvme_cancel_ios(struct nvme_queue
*nvmeq
, bool timeout
)
1180 int depth
= nvmeq
->q_depth
- 1;
1181 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
1182 unsigned long now
= jiffies
;
1185 for_each_set_bit(cmdid
, nvmeq
->cmdid_data
, depth
) {
1187 nvme_completion_fn fn
;
1188 static struct nvme_completion cqe
= {
1189 .status
= cpu_to_le16(NVME_SC_ABORT_REQ
<< 1),
1192 if (timeout
&& !time_after(now
, info
[cmdid
].timeout
))
1194 if (info
[cmdid
].ctx
== CMD_CTX_CANCELLED
)
1196 if (timeout
&& info
[cmdid
].ctx
== CMD_CTX_ASYNC
)
1198 if (timeout
&& nvmeq
->dev
->initialized
) {
1199 nvme_abort_cmd(cmdid
, nvmeq
);
1202 dev_warn(nvmeq
->q_dmadev
, "Cancelling I/O %d QID %d\n", cmdid
,
1204 ctx
= cancel_cmdid(nvmeq
, cmdid
, &fn
);
1205 fn(nvmeq
, ctx
, &cqe
);
1209 static void nvme_free_queue(struct nvme_queue
*nvmeq
)
1211 spin_lock_irq(&nvmeq
->q_lock
);
1212 while (bio_list_peek(&nvmeq
->sq_cong
)) {
1213 struct bio
*bio
= bio_list_pop(&nvmeq
->sq_cong
);
1214 bio_endio(bio
, -EIO
);
1216 while (!list_empty(&nvmeq
->iod_bio
)) {
1217 static struct nvme_completion cqe
= {
1218 .status
= cpu_to_le16(
1219 (NVME_SC_ABORT_REQ
| NVME_SC_DNR
) << 1),
1221 struct nvme_iod
*iod
= list_first_entry(&nvmeq
->iod_bio
,
1224 list_del(&iod
->node
);
1225 bio_completion(nvmeq
, iod
, &cqe
);
1227 spin_unlock_irq(&nvmeq
->q_lock
);
1229 dma_free_coherent(nvmeq
->q_dmadev
, CQ_SIZE(nvmeq
->q_depth
),
1230 (void *)nvmeq
->cqes
, nvmeq
->cq_dma_addr
);
1231 dma_free_coherent(nvmeq
->q_dmadev
, SQ_SIZE(nvmeq
->q_depth
),
1232 nvmeq
->sq_cmds
, nvmeq
->sq_dma_addr
);
1234 free_cpumask_var(nvmeq
->cpu_mask
);
1238 static void nvme_free_queues(struct nvme_dev
*dev
, int lowest
)
1241 struct nvme_queue
*nvmeq
, *next
;
1242 struct llist_node
*entry
;
1245 for (i
= dev
->queue_count
- 1; i
>= lowest
; i
--) {
1246 nvmeq
= raw_nvmeq(dev
, i
);
1247 RCU_INIT_POINTER(dev
->queues
[i
], NULL
);
1248 llist_add(&nvmeq
->node
, &q_list
);
1252 entry
= llist_del_all(&q_list
);
1253 llist_for_each_entry_safe(nvmeq
, next
, entry
, node
)
1254 nvme_free_queue(nvmeq
);
1258 * nvme_suspend_queue - put queue into suspended state
1259 * @nvmeq - queue to suspend
1261 * Returns 1 if already suspended, 0 otherwise.
1263 static int nvme_suspend_queue(struct nvme_queue
*nvmeq
)
1265 int vector
= nvmeq
->dev
->entry
[nvmeq
->cq_vector
].vector
;
1267 spin_lock_irq(&nvmeq
->q_lock
);
1268 if (nvmeq
->q_suspended
) {
1269 spin_unlock_irq(&nvmeq
->q_lock
);
1272 nvmeq
->q_suspended
= 1;
1273 nvmeq
->dev
->online_queues
--;
1274 spin_unlock_irq(&nvmeq
->q_lock
);
1276 irq_set_affinity_hint(vector
, NULL
);
1277 free_irq(vector
, nvmeq
);
1282 static void nvme_clear_queue(struct nvme_queue
*nvmeq
)
1284 spin_lock_irq(&nvmeq
->q_lock
);
1285 nvme_process_cq(nvmeq
);
1286 nvme_cancel_ios(nvmeq
, false);
1287 spin_unlock_irq(&nvmeq
->q_lock
);
1290 static void nvme_disable_queue(struct nvme_dev
*dev
, int qid
)
1292 struct nvme_queue
*nvmeq
= raw_nvmeq(dev
, qid
);
1296 if (nvme_suspend_queue(nvmeq
))
1299 /* Don't tell the adapter to delete the admin queue.
1300 * Don't tell a removed adapter to delete IO queues. */
1301 if (qid
&& readl(&dev
->bar
->csts
) != -1) {
1302 adapter_delete_sq(dev
, qid
);
1303 adapter_delete_cq(dev
, qid
);
1305 nvme_clear_queue(nvmeq
);
1308 static struct nvme_queue
*nvme_alloc_queue(struct nvme_dev
*dev
, int qid
,
1309 int depth
, int vector
)
1311 struct device
*dmadev
= &dev
->pci_dev
->dev
;
1312 unsigned extra
= nvme_queue_extra(depth
);
1313 struct nvme_queue
*nvmeq
= kzalloc(sizeof(*nvmeq
) + extra
, GFP_KERNEL
);
1317 nvmeq
->cqes
= dma_zalloc_coherent(dmadev
, CQ_SIZE(depth
),
1318 &nvmeq
->cq_dma_addr
, GFP_KERNEL
);
1322 nvmeq
->sq_cmds
= dma_alloc_coherent(dmadev
, SQ_SIZE(depth
),
1323 &nvmeq
->sq_dma_addr
, GFP_KERNEL
);
1324 if (!nvmeq
->sq_cmds
)
1327 if (qid
&& !zalloc_cpumask_var(&nvmeq
->cpu_mask
, GFP_KERNEL
))
1330 nvmeq
->q_dmadev
= dmadev
;
1332 snprintf(nvmeq
->irqname
, sizeof(nvmeq
->irqname
), "nvme%dq%d",
1333 dev
->instance
, qid
);
1334 spin_lock_init(&nvmeq
->q_lock
);
1336 nvmeq
->cq_phase
= 1;
1337 init_waitqueue_head(&nvmeq
->sq_full
);
1338 bio_list_init(&nvmeq
->sq_cong
);
1339 INIT_LIST_HEAD(&nvmeq
->iod_bio
);
1340 nvmeq
->q_db
= &dev
->dbs
[qid
* 2 * dev
->db_stride
];
1341 nvmeq
->q_depth
= depth
;
1342 nvmeq
->cq_vector
= vector
;
1344 nvmeq
->q_suspended
= 1;
1346 rcu_assign_pointer(dev
->queues
[qid
], nvmeq
);
1351 dma_free_coherent(dmadev
, SQ_SIZE(depth
), (void *)nvmeq
->sq_cmds
,
1352 nvmeq
->sq_dma_addr
);
1354 dma_free_coherent(dmadev
, CQ_SIZE(depth
), (void *)nvmeq
->cqes
,
1355 nvmeq
->cq_dma_addr
);
1361 static int queue_request_irq(struct nvme_dev
*dev
, struct nvme_queue
*nvmeq
,
1364 if (use_threaded_interrupts
)
1365 return request_threaded_irq(dev
->entry
[nvmeq
->cq_vector
].vector
,
1366 nvme_irq_check
, nvme_irq
, IRQF_SHARED
,
1368 return request_irq(dev
->entry
[nvmeq
->cq_vector
].vector
, nvme_irq
,
1369 IRQF_SHARED
, name
, nvmeq
);
1372 static void nvme_init_queue(struct nvme_queue
*nvmeq
, u16 qid
)
1374 struct nvme_dev
*dev
= nvmeq
->dev
;
1375 unsigned extra
= nvme_queue_extra(nvmeq
->q_depth
);
1377 spin_lock_irq(&nvmeq
->q_lock
);
1378 init_waitqueue_entry(&nvmeq
->sq_cong_wait
, nvme_thread
);
1381 nvmeq
->cq_phase
= 1;
1382 nvmeq
->q_db
= &dev
->dbs
[qid
* 2 * dev
->db_stride
];
1383 memset(nvmeq
->cmdid_data
, 0, extra
);
1384 memset((void *)nvmeq
->cqes
, 0, CQ_SIZE(nvmeq
->q_depth
));
1385 nvme_cancel_ios(nvmeq
, false);
1386 nvmeq
->q_suspended
= 0;
1387 dev
->online_queues
++;
1388 spin_unlock_irq(&nvmeq
->q_lock
);
1391 static int nvme_create_queue(struct nvme_queue
*nvmeq
, int qid
)
1393 struct nvme_dev
*dev
= nvmeq
->dev
;
1396 result
= adapter_alloc_cq(dev
, qid
, nvmeq
);
1400 result
= adapter_alloc_sq(dev
, qid
, nvmeq
);
1404 result
= queue_request_irq(dev
, nvmeq
, nvmeq
->irqname
);
1408 nvme_init_queue(nvmeq
, qid
);
1412 adapter_delete_sq(dev
, qid
);
1414 adapter_delete_cq(dev
, qid
);
1418 static int nvme_wait_ready(struct nvme_dev
*dev
, u64 cap
, bool enabled
)
1420 unsigned long timeout
;
1421 u32 bit
= enabled
? NVME_CSTS_RDY
: 0;
1423 timeout
= ((NVME_CAP_TIMEOUT(cap
) + 1) * HZ
/ 2) + jiffies
;
1425 while ((readl(&dev
->bar
->csts
) & NVME_CSTS_RDY
) != bit
) {
1427 if (fatal_signal_pending(current
))
1429 if (time_after(jiffies
, timeout
)) {
1430 dev_err(&dev
->pci_dev
->dev
,
1431 "Device not ready; aborting %s\n", enabled
?
1432 "initialisation" : "reset");
1441 * If the device has been passed off to us in an enabled state, just clear
1442 * the enabled bit. The spec says we should set the 'shutdown notification
1443 * bits', but doing so may cause the device to complete commands to the
1444 * admin queue ... and we don't know what memory that might be pointing at!
1446 static int nvme_disable_ctrl(struct nvme_dev
*dev
, u64 cap
)
1448 dev
->ctrl_config
&= ~NVME_CC_SHN_MASK
;
1449 dev
->ctrl_config
&= ~NVME_CC_ENABLE
;
1450 writel(dev
->ctrl_config
, &dev
->bar
->cc
);
1452 return nvme_wait_ready(dev
, cap
, false);
1455 static int nvme_enable_ctrl(struct nvme_dev
*dev
, u64 cap
)
1457 dev
->ctrl_config
&= ~NVME_CC_SHN_MASK
;
1458 dev
->ctrl_config
|= NVME_CC_ENABLE
;
1459 writel(dev
->ctrl_config
, &dev
->bar
->cc
);
1461 return nvme_wait_ready(dev
, cap
, true);
1464 static int nvme_shutdown_ctrl(struct nvme_dev
*dev
)
1466 unsigned long timeout
;
1468 dev
->ctrl_config
&= ~NVME_CC_SHN_MASK
;
1469 dev
->ctrl_config
|= NVME_CC_SHN_NORMAL
;
1471 writel(dev
->ctrl_config
, &dev
->bar
->cc
);
1473 timeout
= SHUTDOWN_TIMEOUT
+ jiffies
;
1474 while ((readl(&dev
->bar
->csts
) & NVME_CSTS_SHST_MASK
) !=
1475 NVME_CSTS_SHST_CMPLT
) {
1477 if (fatal_signal_pending(current
))
1479 if (time_after(jiffies
, timeout
)) {
1480 dev_err(&dev
->pci_dev
->dev
,
1481 "Device shutdown incomplete; abort shutdown\n");
1489 static int nvme_configure_admin_queue(struct nvme_dev
*dev
)
1493 u64 cap
= readq(&dev
->bar
->cap
);
1494 struct nvme_queue
*nvmeq
;
1495 unsigned page_shift
= PAGE_SHIFT
;
1496 unsigned dev_page_min
= NVME_CAP_MPSMIN(cap
) + 12;
1497 unsigned dev_page_max
= NVME_CAP_MPSMAX(cap
) + 12;
1499 if (page_shift
< dev_page_min
) {
1500 dev_err(&dev
->pci_dev
->dev
,
1501 "Minimum device page size (%u) too large for "
1502 "host (%u)\n", 1 << dev_page_min
,
1506 if (page_shift
> dev_page_max
) {
1507 dev_info(&dev
->pci_dev
->dev
,
1508 "Device maximum page size (%u) smaller than "
1509 "host (%u); enabling work-around\n",
1510 1 << dev_page_max
, 1 << page_shift
);
1511 page_shift
= dev_page_max
;
1514 result
= nvme_disable_ctrl(dev
, cap
);
1518 nvmeq
= raw_nvmeq(dev
, 0);
1520 nvmeq
= nvme_alloc_queue(dev
, 0, 64, 0);
1525 aqa
= nvmeq
->q_depth
- 1;
1528 dev
->page_size
= 1 << page_shift
;
1530 dev
->ctrl_config
= NVME_CC_CSS_NVM
;
1531 dev
->ctrl_config
|= (page_shift
- 12) << NVME_CC_MPS_SHIFT
;
1532 dev
->ctrl_config
|= NVME_CC_ARB_RR
| NVME_CC_SHN_NONE
;
1533 dev
->ctrl_config
|= NVME_CC_IOSQES
| NVME_CC_IOCQES
;
1535 writel(aqa
, &dev
->bar
->aqa
);
1536 writeq(nvmeq
->sq_dma_addr
, &dev
->bar
->asq
);
1537 writeq(nvmeq
->cq_dma_addr
, &dev
->bar
->acq
);
1539 result
= nvme_enable_ctrl(dev
, cap
);
1543 result
= queue_request_irq(dev
, nvmeq
, nvmeq
->irqname
);
1550 struct nvme_iod
*nvme_map_user_pages(struct nvme_dev
*dev
, int write
,
1551 unsigned long addr
, unsigned length
)
1553 int i
, err
, count
, nents
, offset
;
1554 struct scatterlist
*sg
;
1555 struct page
**pages
;
1556 struct nvme_iod
*iod
;
1559 return ERR_PTR(-EINVAL
);
1560 if (!length
|| length
> INT_MAX
- PAGE_SIZE
)
1561 return ERR_PTR(-EINVAL
);
1563 offset
= offset_in_page(addr
);
1564 count
= DIV_ROUND_UP(offset
+ length
, PAGE_SIZE
);
1565 pages
= kcalloc(count
, sizeof(*pages
), GFP_KERNEL
);
1567 return ERR_PTR(-ENOMEM
);
1569 err
= get_user_pages_fast(addr
, count
, 1, pages
);
1577 iod
= nvme_alloc_iod(count
, length
, dev
, GFP_KERNEL
);
1582 sg_init_table(sg
, count
);
1583 for (i
= 0; i
< count
; i
++) {
1584 sg_set_page(&sg
[i
], pages
[i
],
1585 min_t(unsigned, length
, PAGE_SIZE
- offset
),
1587 length
-= (PAGE_SIZE
- offset
);
1590 sg_mark_end(&sg
[i
- 1]);
1593 nents
= dma_map_sg(&dev
->pci_dev
->dev
, sg
, count
,
1594 write
? DMA_TO_DEVICE
: DMA_FROM_DEVICE
);
1604 for (i
= 0; i
< count
; i
++)
1607 return ERR_PTR(err
);
1610 void nvme_unmap_user_pages(struct nvme_dev
*dev
, int write
,
1611 struct nvme_iod
*iod
)
1615 dma_unmap_sg(&dev
->pci_dev
->dev
, iod
->sg
, iod
->nents
,
1616 write
? DMA_TO_DEVICE
: DMA_FROM_DEVICE
);
1618 for (i
= 0; i
< iod
->nents
; i
++)
1619 put_page(sg_page(&iod
->sg
[i
]));
1622 static int nvme_submit_io(struct nvme_ns
*ns
, struct nvme_user_io __user
*uio
)
1624 struct nvme_dev
*dev
= ns
->dev
;
1625 struct nvme_user_io io
;
1626 struct nvme_command c
;
1627 unsigned length
, meta_len
;
1629 struct nvme_iod
*iod
, *meta_iod
= NULL
;
1630 dma_addr_t meta_dma_addr
;
1631 void *meta
, *uninitialized_var(meta_mem
);
1633 if (copy_from_user(&io
, uio
, sizeof(io
)))
1635 length
= (io
.nblocks
+ 1) << ns
->lba_shift
;
1636 meta_len
= (io
.nblocks
+ 1) * ns
->ms
;
1638 if (meta_len
&& ((io
.metadata
& 3) || !io
.metadata
))
1641 switch (io
.opcode
) {
1642 case nvme_cmd_write
:
1644 case nvme_cmd_compare
:
1645 iod
= nvme_map_user_pages(dev
, io
.opcode
& 1, io
.addr
, length
);
1652 return PTR_ERR(iod
);
1654 memset(&c
, 0, sizeof(c
));
1655 c
.rw
.opcode
= io
.opcode
;
1656 c
.rw
.flags
= io
.flags
;
1657 c
.rw
.nsid
= cpu_to_le32(ns
->ns_id
);
1658 c
.rw
.slba
= cpu_to_le64(io
.slba
);
1659 c
.rw
.length
= cpu_to_le16(io
.nblocks
);
1660 c
.rw
.control
= cpu_to_le16(io
.control
);
1661 c
.rw
.dsmgmt
= cpu_to_le32(io
.dsmgmt
);
1662 c
.rw
.reftag
= cpu_to_le32(io
.reftag
);
1663 c
.rw
.apptag
= cpu_to_le16(io
.apptag
);
1664 c
.rw
.appmask
= cpu_to_le16(io
.appmask
);
1667 meta_iod
= nvme_map_user_pages(dev
, io
.opcode
& 1, io
.metadata
,
1669 if (IS_ERR(meta_iod
)) {
1670 status
= PTR_ERR(meta_iod
);
1675 meta_mem
= dma_alloc_coherent(&dev
->pci_dev
->dev
, meta_len
,
1676 &meta_dma_addr
, GFP_KERNEL
);
1682 if (io
.opcode
& 1) {
1683 int meta_offset
= 0;
1685 for (i
= 0; i
< meta_iod
->nents
; i
++) {
1686 meta
= kmap_atomic(sg_page(&meta_iod
->sg
[i
])) +
1687 meta_iod
->sg
[i
].offset
;
1688 memcpy(meta_mem
+ meta_offset
, meta
,
1689 meta_iod
->sg
[i
].length
);
1690 kunmap_atomic(meta
);
1691 meta_offset
+= meta_iod
->sg
[i
].length
;
1695 c
.rw
.metadata
= cpu_to_le64(meta_dma_addr
);
1698 length
= nvme_setup_prps(dev
, iod
, length
, GFP_KERNEL
);
1699 c
.rw
.prp1
= cpu_to_le64(sg_dma_address(iod
->sg
));
1700 c
.rw
.prp2
= cpu_to_le64(iod
->first_dma
);
1702 if (length
!= (io
.nblocks
+ 1) << ns
->lba_shift
)
1705 status
= nvme_submit_io_cmd(dev
, &c
, NULL
);
1708 if (status
== NVME_SC_SUCCESS
&& !(io
.opcode
& 1)) {
1709 int meta_offset
= 0;
1711 for (i
= 0; i
< meta_iod
->nents
; i
++) {
1712 meta
= kmap_atomic(sg_page(&meta_iod
->sg
[i
])) +
1713 meta_iod
->sg
[i
].offset
;
1714 memcpy(meta
, meta_mem
+ meta_offset
,
1715 meta_iod
->sg
[i
].length
);
1716 kunmap_atomic(meta
);
1717 meta_offset
+= meta_iod
->sg
[i
].length
;
1721 dma_free_coherent(&dev
->pci_dev
->dev
, meta_len
, meta_mem
,
1726 nvme_unmap_user_pages(dev
, io
.opcode
& 1, iod
);
1727 nvme_free_iod(dev
, iod
);
1730 nvme_unmap_user_pages(dev
, io
.opcode
& 1, meta_iod
);
1731 nvme_free_iod(dev
, meta_iod
);
1737 static int nvme_user_cmd(struct nvme_dev
*dev
,
1738 struct nvme_passthru_cmd __user
*ucmd
, bool ioq
)
1740 struct nvme_passthru_cmd cmd
;
1741 struct nvme_command c
;
1743 struct nvme_iod
*uninitialized_var(iod
);
1746 if (!capable(CAP_SYS_ADMIN
))
1748 if (copy_from_user(&cmd
, ucmd
, sizeof(cmd
)))
1751 memset(&c
, 0, sizeof(c
));
1752 c
.common
.opcode
= cmd
.opcode
;
1753 c
.common
.flags
= cmd
.flags
;
1754 c
.common
.nsid
= cpu_to_le32(cmd
.nsid
);
1755 c
.common
.cdw2
[0] = cpu_to_le32(cmd
.cdw2
);
1756 c
.common
.cdw2
[1] = cpu_to_le32(cmd
.cdw3
);
1757 c
.common
.cdw10
[0] = cpu_to_le32(cmd
.cdw10
);
1758 c
.common
.cdw10
[1] = cpu_to_le32(cmd
.cdw11
);
1759 c
.common
.cdw10
[2] = cpu_to_le32(cmd
.cdw12
);
1760 c
.common
.cdw10
[3] = cpu_to_le32(cmd
.cdw13
);
1761 c
.common
.cdw10
[4] = cpu_to_le32(cmd
.cdw14
);
1762 c
.common
.cdw10
[5] = cpu_to_le32(cmd
.cdw15
);
1764 length
= cmd
.data_len
;
1766 iod
= nvme_map_user_pages(dev
, cmd
.opcode
& 1, cmd
.addr
,
1769 return PTR_ERR(iod
);
1770 length
= nvme_setup_prps(dev
, iod
, length
, GFP_KERNEL
);
1771 c
.common
.prp1
= cpu_to_le64(sg_dma_address(iod
->sg
));
1772 c
.common
.prp2
= cpu_to_le64(iod
->first_dma
);
1775 timeout
= cmd
.timeout_ms
? msecs_to_jiffies(cmd
.timeout_ms
) :
1777 if (length
!= cmd
.data_len
)
1780 status
= nvme_submit_sync_cmd(dev
, this_cpu_read(*dev
->io_queue
), &c
,
1781 &cmd
.result
, timeout
);
1783 status
= nvme_submit_sync_cmd(dev
, 0, &c
, &cmd
.result
, timeout
);
1786 nvme_unmap_user_pages(dev
, cmd
.opcode
& 1, iod
);
1787 nvme_free_iod(dev
, iod
);
1790 if ((status
>= 0) && copy_to_user(&ucmd
->result
, &cmd
.result
,
1791 sizeof(cmd
.result
)))
1797 static int nvme_ioctl(struct block_device
*bdev
, fmode_t mode
, unsigned int cmd
,
1800 struct nvme_ns
*ns
= bdev
->bd_disk
->private_data
;
1804 force_successful_syscall_return();
1806 case NVME_IOCTL_ADMIN_CMD
:
1807 return nvme_user_cmd(ns
->dev
, (void __user
*)arg
, false);
1808 case NVME_IOCTL_IO_CMD
:
1809 return nvme_user_cmd(ns
->dev
, (void __user
*)arg
, true);
1810 case NVME_IOCTL_SUBMIT_IO
:
1811 return nvme_submit_io(ns
, (void __user
*)arg
);
1812 case SG_GET_VERSION_NUM
:
1813 return nvme_sg_get_version_num((void __user
*)arg
);
1815 return nvme_sg_io(ns
, (void __user
*)arg
);
1821 #ifdef CONFIG_COMPAT
1822 static int nvme_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1823 unsigned int cmd
, unsigned long arg
)
1827 return -ENOIOCTLCMD
;
1829 return nvme_ioctl(bdev
, mode
, cmd
, arg
);
1832 #define nvme_compat_ioctl NULL
1835 static int nvme_open(struct block_device
*bdev
, fmode_t mode
)
1840 spin_lock(&dev_list_lock
);
1841 ns
= bdev
->bd_disk
->private_data
;
1844 else if (!kref_get_unless_zero(&ns
->dev
->kref
))
1846 spin_unlock(&dev_list_lock
);
1851 static void nvme_free_dev(struct kref
*kref
);
1853 static void nvme_release(struct gendisk
*disk
, fmode_t mode
)
1855 struct nvme_ns
*ns
= disk
->private_data
;
1856 struct nvme_dev
*dev
= ns
->dev
;
1858 kref_put(&dev
->kref
, nvme_free_dev
);
1861 static int nvme_getgeo(struct block_device
*bd
, struct hd_geometry
*geo
)
1863 /* some standard values */
1864 geo
->heads
= 1 << 6;
1865 geo
->sectors
= 1 << 5;
1866 geo
->cylinders
= get_capacity(bd
->bd_disk
) >> 11;
1870 static int nvme_revalidate_disk(struct gendisk
*disk
)
1872 struct nvme_ns
*ns
= disk
->private_data
;
1873 struct nvme_dev
*dev
= ns
->dev
;
1874 struct nvme_id_ns
*id
;
1875 dma_addr_t dma_addr
;
1878 id
= dma_alloc_coherent(&dev
->pci_dev
->dev
, 4096, &dma_addr
,
1881 dev_warn(&dev
->pci_dev
->dev
, "%s: Memory alocation failure\n",
1886 if (nvme_identify(dev
, ns
->ns_id
, 0, dma_addr
))
1889 lbaf
= id
->flbas
& 0xf;
1890 ns
->lba_shift
= id
->lbaf
[lbaf
].ds
;
1892 blk_queue_logical_block_size(ns
->queue
, 1 << ns
->lba_shift
);
1893 set_capacity(disk
, le64_to_cpup(&id
->nsze
) << (ns
->lba_shift
- 9));
1895 dma_free_coherent(&dev
->pci_dev
->dev
, 4096, id
, dma_addr
);
1899 static const struct block_device_operations nvme_fops
= {
1900 .owner
= THIS_MODULE
,
1901 .ioctl
= nvme_ioctl
,
1902 .compat_ioctl
= nvme_compat_ioctl
,
1904 .release
= nvme_release
,
1905 .getgeo
= nvme_getgeo
,
1906 .revalidate_disk
= nvme_revalidate_disk
,
1909 static void nvme_resubmit_iods(struct nvme_queue
*nvmeq
)
1911 struct nvme_iod
*iod
, *next
;
1913 list_for_each_entry_safe(iod
, next
, &nvmeq
->iod_bio
, node
) {
1914 if (unlikely(nvme_submit_iod(nvmeq
, iod
)))
1916 list_del(&iod
->node
);
1917 if (bio_list_empty(&nvmeq
->sq_cong
) &&
1918 list_empty(&nvmeq
->iod_bio
))
1919 remove_wait_queue(&nvmeq
->sq_full
,
1920 &nvmeq
->sq_cong_wait
);
1924 static void nvme_resubmit_bios(struct nvme_queue
*nvmeq
)
1926 while (bio_list_peek(&nvmeq
->sq_cong
)) {
1927 struct bio
*bio
= bio_list_pop(&nvmeq
->sq_cong
);
1928 struct nvme_ns
*ns
= bio
->bi_bdev
->bd_disk
->private_data
;
1930 if (bio_list_empty(&nvmeq
->sq_cong
) &&
1931 list_empty(&nvmeq
->iod_bio
))
1932 remove_wait_queue(&nvmeq
->sq_full
,
1933 &nvmeq
->sq_cong_wait
);
1934 if (nvme_submit_bio_queue(nvmeq
, ns
, bio
)) {
1935 if (!waitqueue_active(&nvmeq
->sq_full
))
1936 add_wait_queue(&nvmeq
->sq_full
,
1937 &nvmeq
->sq_cong_wait
);
1938 bio_list_add_head(&nvmeq
->sq_cong
, bio
);
1944 static int nvme_submit_async_req(struct nvme_queue
*nvmeq
)
1946 struct nvme_command
*c
;
1949 cmdid
= alloc_cmdid(nvmeq
, CMD_CTX_ASYNC
, special_completion
, 0);
1953 c
= &nvmeq
->sq_cmds
[nvmeq
->sq_tail
];
1954 memset(c
, 0, sizeof(*c
));
1955 c
->common
.opcode
= nvme_admin_async_event
;
1956 c
->common
.command_id
= cmdid
;
1958 if (++nvmeq
->sq_tail
== nvmeq
->q_depth
)
1960 writel(nvmeq
->sq_tail
, nvmeq
->q_db
);
1965 static int nvme_kthread(void *data
)
1967 struct nvme_dev
*dev
, *next
;
1969 while (!kthread_should_stop()) {
1970 set_current_state(TASK_INTERRUPTIBLE
);
1971 spin_lock(&dev_list_lock
);
1972 list_for_each_entry_safe(dev
, next
, &dev_list
, node
) {
1974 if (readl(&dev
->bar
->csts
) & NVME_CSTS_CFS
&&
1976 if (work_busy(&dev
->reset_work
))
1978 list_del_init(&dev
->node
);
1979 dev_warn(&dev
->pci_dev
->dev
,
1980 "Failed status, reset controller\n");
1981 dev
->reset_workfn
= nvme_reset_failed_dev
;
1982 queue_work(nvme_workq
, &dev
->reset_work
);
1986 for (i
= 0; i
< dev
->queue_count
; i
++) {
1987 struct nvme_queue
*nvmeq
=
1988 rcu_dereference(dev
->queues
[i
]);
1991 spin_lock_irq(&nvmeq
->q_lock
);
1992 if (nvmeq
->q_suspended
)
1994 nvme_process_cq(nvmeq
);
1995 nvme_cancel_ios(nvmeq
, true);
1996 nvme_resubmit_bios(nvmeq
);
1997 nvme_resubmit_iods(nvmeq
);
1999 while ((i
== 0) && (dev
->event_limit
> 0)) {
2000 if (nvme_submit_async_req(nvmeq
))
2005 spin_unlock_irq(&nvmeq
->q_lock
);
2009 spin_unlock(&dev_list_lock
);
2010 schedule_timeout(round_jiffies_relative(HZ
));
2015 static void nvme_config_discard(struct nvme_ns
*ns
)
2017 u32 logical_block_size
= queue_logical_block_size(ns
->queue
);
2018 ns
->queue
->limits
.discard_zeroes_data
= 0;
2019 ns
->queue
->limits
.discard_alignment
= logical_block_size
;
2020 ns
->queue
->limits
.discard_granularity
= logical_block_size
;
2021 ns
->queue
->limits
.max_discard_sectors
= 0xffffffff;
2022 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, ns
->queue
);
2025 static struct nvme_ns
*nvme_alloc_ns(struct nvme_dev
*dev
, unsigned nsid
,
2026 struct nvme_id_ns
*id
, struct nvme_lba_range_type
*rt
)
2029 struct gendisk
*disk
;
2032 if (rt
->attributes
& NVME_LBART_ATTRIB_HIDE
)
2035 ns
= kzalloc(sizeof(*ns
), GFP_KERNEL
);
2038 ns
->queue
= blk_alloc_queue(GFP_KERNEL
);
2041 ns
->queue
->queue_flags
= QUEUE_FLAG_DEFAULT
;
2042 queue_flag_clear_unlocked(QUEUE_FLAG_STACKABLE
, ns
->queue
);
2043 queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES
, ns
->queue
);
2044 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, ns
->queue
);
2045 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM
, ns
->queue
);
2046 blk_queue_make_request(ns
->queue
, nvme_make_request
);
2048 ns
->queue
->queuedata
= ns
;
2050 disk
= alloc_disk(0);
2052 goto out_free_queue
;
2055 lbaf
= id
->flbas
& 0xf;
2056 ns
->lba_shift
= id
->lbaf
[lbaf
].ds
;
2057 ns
->ms
= le16_to_cpu(id
->lbaf
[lbaf
].ms
);
2058 blk_queue_logical_block_size(ns
->queue
, 1 << ns
->lba_shift
);
2059 if (dev
->max_hw_sectors
)
2060 blk_queue_max_hw_sectors(ns
->queue
, dev
->max_hw_sectors
);
2061 if (dev
->vwc
& NVME_CTRL_VWC_PRESENT
)
2062 blk_queue_flush(ns
->queue
, REQ_FLUSH
| REQ_FUA
);
2064 disk
->major
= nvme_major
;
2065 disk
->first_minor
= 0;
2066 disk
->fops
= &nvme_fops
;
2067 disk
->private_data
= ns
;
2068 disk
->queue
= ns
->queue
;
2069 disk
->driverfs_dev
= &dev
->pci_dev
->dev
;
2070 disk
->flags
= GENHD_FL_EXT_DEVT
;
2071 sprintf(disk
->disk_name
, "nvme%dn%d", dev
->instance
, nsid
);
2072 set_capacity(disk
, le64_to_cpup(&id
->nsze
) << (ns
->lba_shift
- 9));
2074 if (dev
->oncs
& NVME_CTRL_ONCS_DSM
)
2075 nvme_config_discard(ns
);
2080 blk_cleanup_queue(ns
->queue
);
2086 static int nvme_find_closest_node(int node
)
2088 int n
, val
, min_val
= INT_MAX
, best_node
= node
;
2090 for_each_online_node(n
) {
2093 val
= node_distance(node
, n
);
2094 if (val
< min_val
) {
2102 static void nvme_set_queue_cpus(cpumask_t
*qmask
, struct nvme_queue
*nvmeq
,
2106 for_each_cpu(cpu
, qmask
) {
2107 if (cpumask_weight(nvmeq
->cpu_mask
) >= count
)
2109 if (!cpumask_test_and_set_cpu(cpu
, nvmeq
->cpu_mask
))
2110 *per_cpu_ptr(nvmeq
->dev
->io_queue
, cpu
) = nvmeq
->qid
;
2114 static void nvme_add_cpus(cpumask_t
*mask
, const cpumask_t
*unassigned_cpus
,
2115 const cpumask_t
*new_mask
, struct nvme_queue
*nvmeq
, int cpus_per_queue
)
2118 for_each_cpu(next_cpu
, new_mask
) {
2119 cpumask_or(mask
, mask
, get_cpu_mask(next_cpu
));
2120 cpumask_or(mask
, mask
, topology_thread_cpumask(next_cpu
));
2121 cpumask_and(mask
, mask
, unassigned_cpus
);
2122 nvme_set_queue_cpus(mask
, nvmeq
, cpus_per_queue
);
2126 static void nvme_create_io_queues(struct nvme_dev
*dev
)
2130 max
= min(dev
->max_qid
, num_online_cpus());
2131 for (i
= dev
->queue_count
; i
<= max
; i
++)
2132 if (!nvme_alloc_queue(dev
, i
, dev
->q_depth
, i
- 1))
2135 max
= min(dev
->queue_count
- 1, num_online_cpus());
2136 for (i
= dev
->online_queues
; i
<= max
; i
++)
2137 if (nvme_create_queue(raw_nvmeq(dev
, i
), i
))
2142 * If there are fewer queues than online cpus, this will try to optimally
2143 * assign a queue to multiple cpus by grouping cpus that are "close" together:
2144 * thread siblings, core, socket, closest node, then whatever else is
2147 static void nvme_assign_io_queues(struct nvme_dev
*dev
)
2149 unsigned cpu
, cpus_per_queue
, queues
, remainder
, i
;
2150 cpumask_var_t unassigned_cpus
;
2152 nvme_create_io_queues(dev
);
2154 queues
= min(dev
->online_queues
- 1, num_online_cpus());
2158 cpus_per_queue
= num_online_cpus() / queues
;
2159 remainder
= queues
- (num_online_cpus() - queues
* cpus_per_queue
);
2161 if (!alloc_cpumask_var(&unassigned_cpus
, GFP_KERNEL
))
2164 cpumask_copy(unassigned_cpus
, cpu_online_mask
);
2165 cpu
= cpumask_first(unassigned_cpus
);
2166 for (i
= 1; i
<= queues
; i
++) {
2167 struct nvme_queue
*nvmeq
= lock_nvmeq(dev
, i
);
2170 cpumask_clear(nvmeq
->cpu_mask
);
2171 if (!cpumask_weight(unassigned_cpus
)) {
2172 unlock_nvmeq(nvmeq
);
2176 mask
= *get_cpu_mask(cpu
);
2177 nvme_set_queue_cpus(&mask
, nvmeq
, cpus_per_queue
);
2178 if (cpus_weight(mask
) < cpus_per_queue
)
2179 nvme_add_cpus(&mask
, unassigned_cpus
,
2180 topology_thread_cpumask(cpu
),
2181 nvmeq
, cpus_per_queue
);
2182 if (cpus_weight(mask
) < cpus_per_queue
)
2183 nvme_add_cpus(&mask
, unassigned_cpus
,
2184 topology_core_cpumask(cpu
),
2185 nvmeq
, cpus_per_queue
);
2186 if (cpus_weight(mask
) < cpus_per_queue
)
2187 nvme_add_cpus(&mask
, unassigned_cpus
,
2188 cpumask_of_node(cpu_to_node(cpu
)),
2189 nvmeq
, cpus_per_queue
);
2190 if (cpus_weight(mask
) < cpus_per_queue
)
2191 nvme_add_cpus(&mask
, unassigned_cpus
,
2193 nvme_find_closest_node(
2195 nvmeq
, cpus_per_queue
);
2196 if (cpus_weight(mask
) < cpus_per_queue
)
2197 nvme_add_cpus(&mask
, unassigned_cpus
,
2199 nvmeq
, cpus_per_queue
);
2201 WARN(cpumask_weight(nvmeq
->cpu_mask
) != cpus_per_queue
,
2202 "nvme%d qid:%d mis-matched queue-to-cpu assignment\n",
2205 irq_set_affinity_hint(dev
->entry
[nvmeq
->cq_vector
].vector
,
2207 cpumask_andnot(unassigned_cpus
, unassigned_cpus
,
2209 cpu
= cpumask_next(cpu
, unassigned_cpus
);
2210 if (remainder
&& !--remainder
)
2212 unlock_nvmeq(nvmeq
);
2214 WARN(cpumask_weight(unassigned_cpus
), "nvme%d unassigned online cpus\n",
2217 cpumask_andnot(unassigned_cpus
, cpu_possible_mask
, cpu_online_mask
);
2218 for_each_cpu(cpu
, unassigned_cpus
)
2219 *per_cpu_ptr(dev
->io_queue
, cpu
) = (i
++ % queues
) + 1;
2220 free_cpumask_var(unassigned_cpus
);
2223 static int set_queue_count(struct nvme_dev
*dev
, int count
)
2227 u32 q_count
= (count
- 1) | ((count
- 1) << 16);
2229 status
= nvme_set_features(dev
, NVME_FEAT_NUM_QUEUES
, q_count
, 0,
2234 dev_err(&dev
->pci_dev
->dev
, "Could not set queue count (%d)\n",
2238 return min(result
& 0xffff, result
>> 16) + 1;
2241 static size_t db_bar_size(struct nvme_dev
*dev
, unsigned nr_io_queues
)
2243 return 4096 + ((nr_io_queues
+ 1) * 8 * dev
->db_stride
);
2246 static void nvme_cpu_workfn(struct work_struct
*work
)
2248 struct nvme_dev
*dev
= container_of(work
, struct nvme_dev
, cpu_work
);
2249 if (dev
->initialized
)
2250 nvme_assign_io_queues(dev
);
2253 static int nvme_cpu_notify(struct notifier_block
*self
,
2254 unsigned long action
, void *hcpu
)
2256 struct nvme_dev
*dev
;
2261 spin_lock(&dev_list_lock
);
2262 list_for_each_entry(dev
, &dev_list
, node
)
2263 schedule_work(&dev
->cpu_work
);
2264 spin_unlock(&dev_list_lock
);
2270 static int nvme_setup_io_queues(struct nvme_dev
*dev
)
2272 struct nvme_queue
*adminq
= raw_nvmeq(dev
, 0);
2273 struct pci_dev
*pdev
= dev
->pci_dev
;
2274 int result
, i
, vecs
, nr_io_queues
, size
;
2276 nr_io_queues
= num_possible_cpus();
2277 result
= set_queue_count(dev
, nr_io_queues
);
2280 if (result
< nr_io_queues
)
2281 nr_io_queues
= result
;
2283 size
= db_bar_size(dev
, nr_io_queues
);
2287 dev
->bar
= ioremap(pci_resource_start(pdev
, 0), size
);
2290 if (!--nr_io_queues
)
2292 size
= db_bar_size(dev
, nr_io_queues
);
2294 dev
->dbs
= ((void __iomem
*)dev
->bar
) + 4096;
2295 adminq
->q_db
= dev
->dbs
;
2298 /* Deregister the admin queue's interrupt */
2299 free_irq(dev
->entry
[0].vector
, adminq
);
2301 for (i
= 0; i
< nr_io_queues
; i
++)
2302 dev
->entry
[i
].entry
= i
;
2303 vecs
= pci_enable_msix_range(pdev
, dev
->entry
, 1, nr_io_queues
);
2305 vecs
= pci_enable_msi_range(pdev
, 1, min(nr_io_queues
, 32));
2309 for (i
= 0; i
< vecs
; i
++)
2310 dev
->entry
[i
].vector
= i
+ pdev
->irq
;
2315 * Should investigate if there's a performance win from allocating
2316 * more queues than interrupt vectors; it might allow the submission
2317 * path to scale better, even if the receive path is limited by the
2318 * number of interrupts.
2320 nr_io_queues
= vecs
;
2321 dev
->max_qid
= nr_io_queues
;
2323 result
= queue_request_irq(dev
, adminq
, adminq
->irqname
);
2325 adminq
->q_suspended
= 1;
2329 /* Free previously allocated queues that are no longer usable */
2330 nvme_free_queues(dev
, nr_io_queues
+ 1);
2331 nvme_assign_io_queues(dev
);
2336 nvme_free_queues(dev
, 1);
2341 * Return: error value if an error occurred setting up the queues or calling
2342 * Identify Device. 0 if these succeeded, even if adding some of the
2343 * namespaces failed. At the moment, these failures are silent. TBD which
2344 * failures should be reported.
2346 static int nvme_dev_add(struct nvme_dev
*dev
)
2348 struct pci_dev
*pdev
= dev
->pci_dev
;
2352 struct nvme_id_ctrl
*ctrl
;
2353 struct nvme_id_ns
*id_ns
;
2355 dma_addr_t dma_addr
;
2356 int shift
= NVME_CAP_MPSMIN(readq(&dev
->bar
->cap
)) + 12;
2358 mem
= dma_alloc_coherent(&pdev
->dev
, 8192, &dma_addr
, GFP_KERNEL
);
2362 res
= nvme_identify(dev
, 0, 1, dma_addr
);
2364 dev_err(&pdev
->dev
, "Identify Controller failed (%d)\n", res
);
2370 nn
= le32_to_cpup(&ctrl
->nn
);
2371 dev
->oncs
= le16_to_cpup(&ctrl
->oncs
);
2372 dev
->abort_limit
= ctrl
->acl
+ 1;
2373 dev
->vwc
= ctrl
->vwc
;
2374 dev
->event_limit
= min(ctrl
->aerl
+ 1, 8);
2375 memcpy(dev
->serial
, ctrl
->sn
, sizeof(ctrl
->sn
));
2376 memcpy(dev
->model
, ctrl
->mn
, sizeof(ctrl
->mn
));
2377 memcpy(dev
->firmware_rev
, ctrl
->fr
, sizeof(ctrl
->fr
));
2379 dev
->max_hw_sectors
= 1 << (ctrl
->mdts
+ shift
- 9);
2380 if ((pdev
->vendor
== PCI_VENDOR_ID_INTEL
) &&
2381 (pdev
->device
== 0x0953) && ctrl
->vs
[3])
2382 dev
->stripe_size
= 1 << (ctrl
->vs
[3] + shift
);
2385 for (i
= 1; i
<= nn
; i
++) {
2386 res
= nvme_identify(dev
, i
, 0, dma_addr
);
2390 if (id_ns
->ncap
== 0)
2393 res
= nvme_get_features(dev
, NVME_FEAT_LBA_RANGE
, i
,
2394 dma_addr
+ 4096, NULL
);
2396 memset(mem
+ 4096, 0, 4096);
2398 ns
= nvme_alloc_ns(dev
, i
, mem
, mem
+ 4096);
2400 list_add_tail(&ns
->list
, &dev
->namespaces
);
2402 list_for_each_entry(ns
, &dev
->namespaces
, list
)
2407 dma_free_coherent(&dev
->pci_dev
->dev
, 8192, mem
, dma_addr
);
2411 static int nvme_dev_map(struct nvme_dev
*dev
)
2414 int bars
, result
= -ENOMEM
;
2415 struct pci_dev
*pdev
= dev
->pci_dev
;
2417 if (pci_enable_device_mem(pdev
))
2420 dev
->entry
[0].vector
= pdev
->irq
;
2421 pci_set_master(pdev
);
2422 bars
= pci_select_bars(pdev
, IORESOURCE_MEM
);
2423 if (pci_request_selected_regions(pdev
, bars
, "nvme"))
2426 if (dma_set_mask_and_coherent(&pdev
->dev
, DMA_BIT_MASK(64)) &&
2427 dma_set_mask_and_coherent(&pdev
->dev
, DMA_BIT_MASK(32)))
2430 dev
->bar
= ioremap(pci_resource_start(pdev
, 0), 8192);
2433 if (readl(&dev
->bar
->csts
) == -1) {
2437 cap
= readq(&dev
->bar
->cap
);
2438 dev
->q_depth
= min_t(int, NVME_CAP_MQES(cap
) + 1, NVME_Q_DEPTH
);
2439 dev
->db_stride
= 1 << NVME_CAP_STRIDE(cap
);
2440 dev
->dbs
= ((void __iomem
*)dev
->bar
) + 4096;
2448 pci_release_regions(pdev
);
2450 pci_disable_device(pdev
);
2454 static void nvme_dev_unmap(struct nvme_dev
*dev
)
2456 if (dev
->pci_dev
->msi_enabled
)
2457 pci_disable_msi(dev
->pci_dev
);
2458 else if (dev
->pci_dev
->msix_enabled
)
2459 pci_disable_msix(dev
->pci_dev
);
2464 pci_release_regions(dev
->pci_dev
);
2467 if (pci_is_enabled(dev
->pci_dev
))
2468 pci_disable_device(dev
->pci_dev
);
2471 struct nvme_delq_ctx
{
2472 struct task_struct
*waiter
;
2473 struct kthread_worker
*worker
;
2477 static void nvme_wait_dq(struct nvme_delq_ctx
*dq
, struct nvme_dev
*dev
)
2479 dq
->waiter
= current
;
2483 set_current_state(TASK_KILLABLE
);
2484 if (!atomic_read(&dq
->refcount
))
2486 if (!schedule_timeout(ADMIN_TIMEOUT
) ||
2487 fatal_signal_pending(current
)) {
2488 set_current_state(TASK_RUNNING
);
2490 nvme_disable_ctrl(dev
, readq(&dev
->bar
->cap
));
2491 nvme_disable_queue(dev
, 0);
2493 send_sig(SIGKILL
, dq
->worker
->task
, 1);
2494 flush_kthread_worker(dq
->worker
);
2498 set_current_state(TASK_RUNNING
);
2501 static void nvme_put_dq(struct nvme_delq_ctx
*dq
)
2503 atomic_dec(&dq
->refcount
);
2505 wake_up_process(dq
->waiter
);
2508 static struct nvme_delq_ctx
*nvme_get_dq(struct nvme_delq_ctx
*dq
)
2510 atomic_inc(&dq
->refcount
);
2514 static void nvme_del_queue_end(struct nvme_queue
*nvmeq
)
2516 struct nvme_delq_ctx
*dq
= nvmeq
->cmdinfo
.ctx
;
2518 nvme_clear_queue(nvmeq
);
2522 static int adapter_async_del_queue(struct nvme_queue
*nvmeq
, u8 opcode
,
2523 kthread_work_func_t fn
)
2525 struct nvme_command c
;
2527 memset(&c
, 0, sizeof(c
));
2528 c
.delete_queue
.opcode
= opcode
;
2529 c
.delete_queue
.qid
= cpu_to_le16(nvmeq
->qid
);
2531 init_kthread_work(&nvmeq
->cmdinfo
.work
, fn
);
2532 return nvme_submit_admin_cmd_async(nvmeq
->dev
, &c
, &nvmeq
->cmdinfo
);
2535 static void nvme_del_cq_work_handler(struct kthread_work
*work
)
2537 struct nvme_queue
*nvmeq
= container_of(work
, struct nvme_queue
,
2539 nvme_del_queue_end(nvmeq
);
2542 static int nvme_delete_cq(struct nvme_queue
*nvmeq
)
2544 return adapter_async_del_queue(nvmeq
, nvme_admin_delete_cq
,
2545 nvme_del_cq_work_handler
);
2548 static void nvme_del_sq_work_handler(struct kthread_work
*work
)
2550 struct nvme_queue
*nvmeq
= container_of(work
, struct nvme_queue
,
2552 int status
= nvmeq
->cmdinfo
.status
;
2555 status
= nvme_delete_cq(nvmeq
);
2557 nvme_del_queue_end(nvmeq
);
2560 static int nvme_delete_sq(struct nvme_queue
*nvmeq
)
2562 return adapter_async_del_queue(nvmeq
, nvme_admin_delete_sq
,
2563 nvme_del_sq_work_handler
);
2566 static void nvme_del_queue_start(struct kthread_work
*work
)
2568 struct nvme_queue
*nvmeq
= container_of(work
, struct nvme_queue
,
2570 allow_signal(SIGKILL
);
2571 if (nvme_delete_sq(nvmeq
))
2572 nvme_del_queue_end(nvmeq
);
2575 static void nvme_disable_io_queues(struct nvme_dev
*dev
)
2578 DEFINE_KTHREAD_WORKER_ONSTACK(worker
);
2579 struct nvme_delq_ctx dq
;
2580 struct task_struct
*kworker_task
= kthread_run(kthread_worker_fn
,
2581 &worker
, "nvme%d", dev
->instance
);
2583 if (IS_ERR(kworker_task
)) {
2584 dev_err(&dev
->pci_dev
->dev
,
2585 "Failed to create queue del task\n");
2586 for (i
= dev
->queue_count
- 1; i
> 0; i
--)
2587 nvme_disable_queue(dev
, i
);
2592 atomic_set(&dq
.refcount
, 0);
2593 dq
.worker
= &worker
;
2594 for (i
= dev
->queue_count
- 1; i
> 0; i
--) {
2595 struct nvme_queue
*nvmeq
= raw_nvmeq(dev
, i
);
2597 if (nvme_suspend_queue(nvmeq
))
2599 nvmeq
->cmdinfo
.ctx
= nvme_get_dq(&dq
);
2600 nvmeq
->cmdinfo
.worker
= dq
.worker
;
2601 init_kthread_work(&nvmeq
->cmdinfo
.work
, nvme_del_queue_start
);
2602 queue_kthread_work(dq
.worker
, &nvmeq
->cmdinfo
.work
);
2604 nvme_wait_dq(&dq
, dev
);
2605 kthread_stop(kworker_task
);
2609 * Remove the node from the device list and check
2610 * for whether or not we need to stop the nvme_thread.
2612 static void nvme_dev_list_remove(struct nvme_dev
*dev
)
2614 struct task_struct
*tmp
= NULL
;
2616 spin_lock(&dev_list_lock
);
2617 list_del_init(&dev
->node
);
2618 if (list_empty(&dev_list
) && !IS_ERR_OR_NULL(nvme_thread
)) {
2622 spin_unlock(&dev_list_lock
);
2628 static void nvme_dev_shutdown(struct nvme_dev
*dev
)
2633 dev
->initialized
= 0;
2634 nvme_dev_list_remove(dev
);
2637 csts
= readl(&dev
->bar
->csts
);
2638 if (csts
& NVME_CSTS_CFS
|| !(csts
& NVME_CSTS_RDY
)) {
2639 for (i
= dev
->queue_count
- 1; i
>= 0; i
--) {
2640 struct nvme_queue
*nvmeq
= raw_nvmeq(dev
, i
);
2641 nvme_suspend_queue(nvmeq
);
2642 nvme_clear_queue(nvmeq
);
2645 nvme_disable_io_queues(dev
);
2646 nvme_shutdown_ctrl(dev
);
2647 nvme_disable_queue(dev
, 0);
2649 nvme_dev_unmap(dev
);
2652 static void nvme_dev_remove(struct nvme_dev
*dev
)
2656 list_for_each_entry(ns
, &dev
->namespaces
, list
) {
2657 if (ns
->disk
->flags
& GENHD_FL_UP
)
2658 del_gendisk(ns
->disk
);
2659 if (!blk_queue_dying(ns
->queue
))
2660 blk_cleanup_queue(ns
->queue
);
2664 static int nvme_setup_prp_pools(struct nvme_dev
*dev
)
2666 struct device
*dmadev
= &dev
->pci_dev
->dev
;
2667 dev
->prp_page_pool
= dma_pool_create("prp list page", dmadev
,
2668 PAGE_SIZE
, PAGE_SIZE
, 0);
2669 if (!dev
->prp_page_pool
)
2672 /* Optimisation for I/Os between 4k and 128k */
2673 dev
->prp_small_pool
= dma_pool_create("prp list 256", dmadev
,
2675 if (!dev
->prp_small_pool
) {
2676 dma_pool_destroy(dev
->prp_page_pool
);
2682 static void nvme_release_prp_pools(struct nvme_dev
*dev
)
2684 dma_pool_destroy(dev
->prp_page_pool
);
2685 dma_pool_destroy(dev
->prp_small_pool
);
2688 static DEFINE_IDA(nvme_instance_ida
);
2690 static int nvme_set_instance(struct nvme_dev
*dev
)
2692 int instance
, error
;
2695 if (!ida_pre_get(&nvme_instance_ida
, GFP_KERNEL
))
2698 spin_lock(&dev_list_lock
);
2699 error
= ida_get_new(&nvme_instance_ida
, &instance
);
2700 spin_unlock(&dev_list_lock
);
2701 } while (error
== -EAGAIN
);
2706 dev
->instance
= instance
;
2710 static void nvme_release_instance(struct nvme_dev
*dev
)
2712 spin_lock(&dev_list_lock
);
2713 ida_remove(&nvme_instance_ida
, dev
->instance
);
2714 spin_unlock(&dev_list_lock
);
2717 static void nvme_free_namespaces(struct nvme_dev
*dev
)
2719 struct nvme_ns
*ns
, *next
;
2721 list_for_each_entry_safe(ns
, next
, &dev
->namespaces
, list
) {
2722 list_del(&ns
->list
);
2724 spin_lock(&dev_list_lock
);
2725 ns
->disk
->private_data
= NULL
;
2726 spin_unlock(&dev_list_lock
);
2733 static void nvme_free_dev(struct kref
*kref
)
2735 struct nvme_dev
*dev
= container_of(kref
, struct nvme_dev
, kref
);
2737 pci_dev_put(dev
->pci_dev
);
2738 nvme_free_namespaces(dev
);
2739 free_percpu(dev
->io_queue
);
2745 static int nvme_dev_open(struct inode
*inode
, struct file
*f
)
2747 struct nvme_dev
*dev
= container_of(f
->private_data
, struct nvme_dev
,
2749 kref_get(&dev
->kref
);
2750 f
->private_data
= dev
;
2754 static int nvme_dev_release(struct inode
*inode
, struct file
*f
)
2756 struct nvme_dev
*dev
= f
->private_data
;
2757 kref_put(&dev
->kref
, nvme_free_dev
);
2761 static long nvme_dev_ioctl(struct file
*f
, unsigned int cmd
, unsigned long arg
)
2763 struct nvme_dev
*dev
= f
->private_data
;
2765 case NVME_IOCTL_ADMIN_CMD
:
2766 return nvme_user_cmd(dev
, (void __user
*)arg
, false);
2767 case NVME_IOCTL_IO_CMD
:
2768 return nvme_user_cmd(dev
, (void __user
*)arg
, true);
2774 static const struct file_operations nvme_dev_fops
= {
2775 .owner
= THIS_MODULE
,
2776 .open
= nvme_dev_open
,
2777 .release
= nvme_dev_release
,
2778 .unlocked_ioctl
= nvme_dev_ioctl
,
2779 .compat_ioctl
= nvme_dev_ioctl
,
2782 static int nvme_dev_start(struct nvme_dev
*dev
)
2785 bool start_thread
= false;
2787 result
= nvme_dev_map(dev
);
2791 result
= nvme_configure_admin_queue(dev
);
2795 spin_lock(&dev_list_lock
);
2796 if (list_empty(&dev_list
) && IS_ERR_OR_NULL(nvme_thread
)) {
2797 start_thread
= true;
2800 list_add(&dev
->node
, &dev_list
);
2801 spin_unlock(&dev_list_lock
);
2804 nvme_thread
= kthread_run(nvme_kthread
, NULL
, "nvme");
2805 wake_up_all(&nvme_kthread_wait
);
2807 wait_event_killable(nvme_kthread_wait
, nvme_thread
);
2809 if (IS_ERR_OR_NULL(nvme_thread
)) {
2810 result
= nvme_thread
? PTR_ERR(nvme_thread
) : -EINTR
;
2813 nvme_init_queue(raw_nvmeq(dev
, 0), 0);
2815 result
= nvme_setup_io_queues(dev
);
2822 nvme_disable_queue(dev
, 0);
2823 nvme_dev_list_remove(dev
);
2825 nvme_dev_unmap(dev
);
2829 static int nvme_remove_dead_ctrl(void *arg
)
2831 struct nvme_dev
*dev
= (struct nvme_dev
*)arg
;
2832 struct pci_dev
*pdev
= dev
->pci_dev
;
2834 if (pci_get_drvdata(pdev
))
2835 pci_stop_and_remove_bus_device_locked(pdev
);
2836 kref_put(&dev
->kref
, nvme_free_dev
);
2840 static void nvme_remove_disks(struct work_struct
*ws
)
2842 struct nvme_dev
*dev
= container_of(ws
, struct nvme_dev
, reset_work
);
2844 nvme_free_queues(dev
, 1);
2845 nvme_dev_remove(dev
);
2848 static int nvme_dev_resume(struct nvme_dev
*dev
)
2852 ret
= nvme_dev_start(dev
);
2855 if (dev
->online_queues
< 2) {
2856 spin_lock(&dev_list_lock
);
2857 dev
->reset_workfn
= nvme_remove_disks
;
2858 queue_work(nvme_workq
, &dev
->reset_work
);
2859 spin_unlock(&dev_list_lock
);
2861 dev
->initialized
= 1;
2865 static void nvme_dev_reset(struct nvme_dev
*dev
)
2867 nvme_dev_shutdown(dev
);
2868 if (nvme_dev_resume(dev
)) {
2869 dev_err(&dev
->pci_dev
->dev
, "Device failed to resume\n");
2870 kref_get(&dev
->kref
);
2871 if (IS_ERR(kthread_run(nvme_remove_dead_ctrl
, dev
, "nvme%d",
2873 dev_err(&dev
->pci_dev
->dev
,
2874 "Failed to start controller remove task\n");
2875 kref_put(&dev
->kref
, nvme_free_dev
);
2880 static void nvme_reset_failed_dev(struct work_struct
*ws
)
2882 struct nvme_dev
*dev
= container_of(ws
, struct nvme_dev
, reset_work
);
2883 nvme_dev_reset(dev
);
2886 static void nvme_reset_workfn(struct work_struct
*work
)
2888 struct nvme_dev
*dev
= container_of(work
, struct nvme_dev
, reset_work
);
2889 dev
->reset_workfn(work
);
2892 static int nvme_probe(struct pci_dev
*pdev
, const struct pci_device_id
*id
)
2894 int result
= -ENOMEM
;
2895 struct nvme_dev
*dev
;
2897 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
2900 dev
->entry
= kcalloc(num_possible_cpus(), sizeof(*dev
->entry
),
2904 dev
->queues
= kcalloc(num_possible_cpus() + 1, sizeof(void *),
2908 dev
->io_queue
= alloc_percpu(unsigned short);
2912 INIT_LIST_HEAD(&dev
->namespaces
);
2913 dev
->reset_workfn
= nvme_reset_failed_dev
;
2914 INIT_WORK(&dev
->reset_work
, nvme_reset_workfn
);
2915 INIT_WORK(&dev
->cpu_work
, nvme_cpu_workfn
);
2916 dev
->pci_dev
= pci_dev_get(pdev
);
2917 pci_set_drvdata(pdev
, dev
);
2918 result
= nvme_set_instance(dev
);
2922 result
= nvme_setup_prp_pools(dev
);
2926 kref_init(&dev
->kref
);
2927 result
= nvme_dev_start(dev
);
2931 if (dev
->online_queues
> 1)
2932 result
= nvme_dev_add(dev
);
2936 scnprintf(dev
->name
, sizeof(dev
->name
), "nvme%d", dev
->instance
);
2937 dev
->miscdev
.minor
= MISC_DYNAMIC_MINOR
;
2938 dev
->miscdev
.parent
= &pdev
->dev
;
2939 dev
->miscdev
.name
= dev
->name
;
2940 dev
->miscdev
.fops
= &nvme_dev_fops
;
2941 result
= misc_register(&dev
->miscdev
);
2945 dev
->initialized
= 1;
2949 nvme_dev_remove(dev
);
2950 nvme_free_namespaces(dev
);
2952 nvme_dev_shutdown(dev
);
2954 nvme_free_queues(dev
, 0);
2955 nvme_release_prp_pools(dev
);
2957 nvme_release_instance(dev
);
2959 pci_dev_put(dev
->pci_dev
);
2961 free_percpu(dev
->io_queue
);
2968 static void nvme_reset_notify(struct pci_dev
*pdev
, bool prepare
)
2970 struct nvme_dev
*dev
= pci_get_drvdata(pdev
);
2973 nvme_dev_shutdown(dev
);
2975 nvme_dev_resume(dev
);
2978 static void nvme_shutdown(struct pci_dev
*pdev
)
2980 struct nvme_dev
*dev
= pci_get_drvdata(pdev
);
2981 nvme_dev_shutdown(dev
);
2984 static void nvme_remove(struct pci_dev
*pdev
)
2986 struct nvme_dev
*dev
= pci_get_drvdata(pdev
);
2988 spin_lock(&dev_list_lock
);
2989 list_del_init(&dev
->node
);
2990 spin_unlock(&dev_list_lock
);
2992 pci_set_drvdata(pdev
, NULL
);
2993 flush_work(&dev
->reset_work
);
2994 flush_work(&dev
->cpu_work
);
2995 misc_deregister(&dev
->miscdev
);
2996 nvme_dev_shutdown(dev
);
2997 nvme_free_queues(dev
, 0);
2998 nvme_dev_remove(dev
);
2999 nvme_release_instance(dev
);
3000 nvme_release_prp_pools(dev
);
3001 kref_put(&dev
->kref
, nvme_free_dev
);
3004 /* These functions are yet to be implemented */
3005 #define nvme_error_detected NULL
3006 #define nvme_dump_registers NULL
3007 #define nvme_link_reset NULL
3008 #define nvme_slot_reset NULL
3009 #define nvme_error_resume NULL
3011 #ifdef CONFIG_PM_SLEEP
3012 static int nvme_suspend(struct device
*dev
)
3014 struct pci_dev
*pdev
= to_pci_dev(dev
);
3015 struct nvme_dev
*ndev
= pci_get_drvdata(pdev
);
3017 nvme_dev_shutdown(ndev
);
3021 static int nvme_resume(struct device
*dev
)
3023 struct pci_dev
*pdev
= to_pci_dev(dev
);
3024 struct nvme_dev
*ndev
= pci_get_drvdata(pdev
);
3026 if (nvme_dev_resume(ndev
) && !work_busy(&ndev
->reset_work
)) {
3027 ndev
->reset_workfn
= nvme_reset_failed_dev
;
3028 queue_work(nvme_workq
, &ndev
->reset_work
);
3034 static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops
, nvme_suspend
, nvme_resume
);
3036 static const struct pci_error_handlers nvme_err_handler
= {
3037 .error_detected
= nvme_error_detected
,
3038 .mmio_enabled
= nvme_dump_registers
,
3039 .link_reset
= nvme_link_reset
,
3040 .slot_reset
= nvme_slot_reset
,
3041 .resume
= nvme_error_resume
,
3042 .reset_notify
= nvme_reset_notify
,
3045 /* Move to pci_ids.h later */
3046 #define PCI_CLASS_STORAGE_EXPRESS 0x010802
3048 static const struct pci_device_id nvme_id_table
[] = {
3049 { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS
, 0xffffff) },
3052 MODULE_DEVICE_TABLE(pci
, nvme_id_table
);
3054 static struct pci_driver nvme_driver
= {
3056 .id_table
= nvme_id_table
,
3057 .probe
= nvme_probe
,
3058 .remove
= nvme_remove
,
3059 .shutdown
= nvme_shutdown
,
3061 .pm
= &nvme_dev_pm_ops
,
3063 .err_handler
= &nvme_err_handler
,
3066 static int __init
nvme_init(void)
3070 init_waitqueue_head(&nvme_kthread_wait
);
3072 nvme_workq
= create_singlethread_workqueue("nvme");
3076 result
= register_blkdev(nvme_major
, "nvme");
3079 else if (result
> 0)
3080 nvme_major
= result
;
3082 nvme_nb
.notifier_call
= &nvme_cpu_notify
;
3083 result
= register_hotcpu_notifier(&nvme_nb
);
3085 goto unregister_blkdev
;
3087 result
= pci_register_driver(&nvme_driver
);
3089 goto unregister_hotcpu
;
3093 unregister_hotcpu_notifier(&nvme_nb
);
3095 unregister_blkdev(nvme_major
, "nvme");
3097 destroy_workqueue(nvme_workq
);
3101 static void __exit
nvme_exit(void)
3103 pci_unregister_driver(&nvme_driver
);
3104 unregister_hotcpu_notifier(&nvme_nb
);
3105 unregister_blkdev(nvme_major
, "nvme");
3106 destroy_workqueue(nvme_workq
);
3107 BUG_ON(nvme_thread
&& !IS_ERR(nvme_thread
));
3111 MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>");
3112 MODULE_LICENSE("GPL");
3113 MODULE_VERSION("0.9");
3114 module_init(nvme_init
);
3115 module_exit(nvme_exit
);