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/aer.h>
16 #include <linux/bitops.h>
17 #include <linux/blkdev.h>
18 #include <linux/blk-mq.h>
19 #include <linux/blk-mq-pci.h>
20 #include <linux/cpu.h>
21 #include <linux/delay.h>
22 #include <linux/errno.h>
24 #include <linux/genhd.h>
25 #include <linux/hdreg.h>
26 #include <linux/idr.h>
27 #include <linux/init.h>
28 #include <linux/interrupt.h>
30 #include <linux/kdev_t.h>
31 #include <linux/kernel.h>
33 #include <linux/module.h>
34 #include <linux/moduleparam.h>
35 #include <linux/mutex.h>
36 #include <linux/pci.h>
37 #include <linux/poison.h>
38 #include <linux/ptrace.h>
39 #include <linux/sched.h>
40 #include <linux/slab.h>
41 #include <linux/t10-pi.h>
42 #include <linux/timer.h>
43 #include <linux/types.h>
44 #include <linux/io-64-nonatomic-lo-hi.h>
45 #include <asm/unaligned.h>
49 #define NVME_Q_DEPTH 1024
50 #define NVME_AQ_DEPTH 256
51 #define SQ_SIZE(depth) (depth * sizeof(struct nvme_command))
52 #define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion))
55 * We handle AEN commands ourselves and don't even let the
56 * block layer know about them.
58 #define NVME_AQ_BLKMQ_DEPTH (NVME_AQ_DEPTH - NVME_NR_AERS)
60 static int use_threaded_interrupts
;
61 module_param(use_threaded_interrupts
, int, 0);
63 static bool use_cmb_sqes
= true;
64 module_param(use_cmb_sqes
, bool, 0644);
65 MODULE_PARM_DESC(use_cmb_sqes
, "use controller's memory buffer for I/O SQes");
67 static struct workqueue_struct
*nvme_workq
;
72 static int nvme_reset(struct nvme_dev
*dev
);
73 static void nvme_process_cq(struct nvme_queue
*nvmeq
);
74 static void nvme_dev_disable(struct nvme_dev
*dev
, bool shutdown
);
77 * Represents an NVM Express device. Each nvme_dev is a PCI function.
80 struct nvme_queue
**queues
;
81 struct blk_mq_tag_set tagset
;
82 struct blk_mq_tag_set admin_tagset
;
85 struct dma_pool
*prp_page_pool
;
86 struct dma_pool
*prp_small_pool
;
88 unsigned online_queues
;
93 struct work_struct reset_work
;
94 struct work_struct remove_work
;
95 struct timer_list watchdog_timer
;
96 struct mutex shutdown_lock
;
99 dma_addr_t cmb_dma_addr
;
103 struct nvme_ctrl ctrl
;
104 struct completion ioq_wait
;
107 static inline struct nvme_dev
*to_nvme_dev(struct nvme_ctrl
*ctrl
)
109 return container_of(ctrl
, struct nvme_dev
, ctrl
);
113 * An NVM Express queue. Each device has at least two (one for admin
114 * commands and one for I/O commands).
117 struct device
*q_dmadev
;
118 struct nvme_dev
*dev
;
119 char irqname
[24]; /* nvme4294967295-65535\0 */
121 struct nvme_command
*sq_cmds
;
122 struct nvme_command __iomem
*sq_cmds_io
;
123 volatile struct nvme_completion
*cqes
;
124 struct blk_mq_tags
**tags
;
125 dma_addr_t sq_dma_addr
;
126 dma_addr_t cq_dma_addr
;
138 * The nvme_iod describes the data in an I/O, including the list of PRP
139 * entries. You can't see it in this data structure because C doesn't let
140 * me express that. Use nvme_init_iod to ensure there's enough space
141 * allocated to store the PRP list.
144 struct nvme_request req
;
145 struct nvme_queue
*nvmeq
;
147 int npages
; /* In the PRP list. 0 means small pool in use */
148 int nents
; /* Used in scatterlist */
149 int length
; /* Of data, in bytes */
150 dma_addr_t first_dma
;
151 struct scatterlist meta_sg
; /* metadata requires single contiguous buffer */
152 struct scatterlist
*sg
;
153 struct scatterlist inline_sg
[0];
157 * Check we didin't inadvertently grow the command struct
159 static inline void _nvme_check_size(void)
161 BUILD_BUG_ON(sizeof(struct nvme_rw_command
) != 64);
162 BUILD_BUG_ON(sizeof(struct nvme_create_cq
) != 64);
163 BUILD_BUG_ON(sizeof(struct nvme_create_sq
) != 64);
164 BUILD_BUG_ON(sizeof(struct nvme_delete_queue
) != 64);
165 BUILD_BUG_ON(sizeof(struct nvme_features
) != 64);
166 BUILD_BUG_ON(sizeof(struct nvme_format_cmd
) != 64);
167 BUILD_BUG_ON(sizeof(struct nvme_abort_cmd
) != 64);
168 BUILD_BUG_ON(sizeof(struct nvme_command
) != 64);
169 BUILD_BUG_ON(sizeof(struct nvme_id_ctrl
) != 4096);
170 BUILD_BUG_ON(sizeof(struct nvme_id_ns
) != 4096);
171 BUILD_BUG_ON(sizeof(struct nvme_lba_range_type
) != 64);
172 BUILD_BUG_ON(sizeof(struct nvme_smart_log
) != 512);
176 * Max size of iod being embedded in the request payload
178 #define NVME_INT_PAGES 2
179 #define NVME_INT_BYTES(dev) (NVME_INT_PAGES * (dev)->ctrl.page_size)
182 * Will slightly overestimate the number of pages needed. This is OK
183 * as it only leads to a small amount of wasted memory for the lifetime of
186 static int nvme_npages(unsigned size
, struct nvme_dev
*dev
)
188 unsigned nprps
= DIV_ROUND_UP(size
+ dev
->ctrl
.page_size
,
189 dev
->ctrl
.page_size
);
190 return DIV_ROUND_UP(8 * nprps
, PAGE_SIZE
- 8);
193 static unsigned int nvme_iod_alloc_size(struct nvme_dev
*dev
,
194 unsigned int size
, unsigned int nseg
)
196 return sizeof(__le64
*) * nvme_npages(size
, dev
) +
197 sizeof(struct scatterlist
) * nseg
;
200 static unsigned int nvme_cmd_size(struct nvme_dev
*dev
)
202 return sizeof(struct nvme_iod
) +
203 nvme_iod_alloc_size(dev
, NVME_INT_BYTES(dev
), NVME_INT_PAGES
);
206 static int nvmeq_irq(struct nvme_queue
*nvmeq
)
208 return pci_irq_vector(to_pci_dev(nvmeq
->dev
->dev
), nvmeq
->cq_vector
);
211 static int nvme_admin_init_hctx(struct blk_mq_hw_ctx
*hctx
, void *data
,
212 unsigned int hctx_idx
)
214 struct nvme_dev
*dev
= data
;
215 struct nvme_queue
*nvmeq
= dev
->queues
[0];
217 WARN_ON(hctx_idx
!= 0);
218 WARN_ON(dev
->admin_tagset
.tags
[0] != hctx
->tags
);
219 WARN_ON(nvmeq
->tags
);
221 hctx
->driver_data
= nvmeq
;
222 nvmeq
->tags
= &dev
->admin_tagset
.tags
[0];
226 static void nvme_admin_exit_hctx(struct blk_mq_hw_ctx
*hctx
, unsigned int hctx_idx
)
228 struct nvme_queue
*nvmeq
= hctx
->driver_data
;
233 static int nvme_admin_init_request(void *data
, struct request
*req
,
234 unsigned int hctx_idx
, unsigned int rq_idx
,
235 unsigned int numa_node
)
237 struct nvme_dev
*dev
= data
;
238 struct nvme_iod
*iod
= blk_mq_rq_to_pdu(req
);
239 struct nvme_queue
*nvmeq
= dev
->queues
[0];
246 static int nvme_init_hctx(struct blk_mq_hw_ctx
*hctx
, void *data
,
247 unsigned int hctx_idx
)
249 struct nvme_dev
*dev
= data
;
250 struct nvme_queue
*nvmeq
= dev
->queues
[hctx_idx
+ 1];
253 nvmeq
->tags
= &dev
->tagset
.tags
[hctx_idx
];
255 WARN_ON(dev
->tagset
.tags
[hctx_idx
] != hctx
->tags
);
256 hctx
->driver_data
= nvmeq
;
260 static int nvme_init_request(void *data
, struct request
*req
,
261 unsigned int hctx_idx
, unsigned int rq_idx
,
262 unsigned int numa_node
)
264 struct nvme_dev
*dev
= data
;
265 struct nvme_iod
*iod
= blk_mq_rq_to_pdu(req
);
266 struct nvme_queue
*nvmeq
= dev
->queues
[hctx_idx
+ 1];
273 static int nvme_pci_map_queues(struct blk_mq_tag_set
*set
)
275 struct nvme_dev
*dev
= set
->driver_data
;
277 return blk_mq_pci_map_queues(set
, to_pci_dev(dev
->dev
));
281 * __nvme_submit_cmd() - Copy a command into a queue and ring the doorbell
282 * @nvmeq: The queue to use
283 * @cmd: The command to send
285 * Safe to use from interrupt context
287 static void __nvme_submit_cmd(struct nvme_queue
*nvmeq
,
288 struct nvme_command
*cmd
)
290 u16 tail
= nvmeq
->sq_tail
;
292 if (nvmeq
->sq_cmds_io
)
293 memcpy_toio(&nvmeq
->sq_cmds_io
[tail
], cmd
, sizeof(*cmd
));
295 memcpy(&nvmeq
->sq_cmds
[tail
], cmd
, sizeof(*cmd
));
297 if (++tail
== nvmeq
->q_depth
)
299 writel(tail
, nvmeq
->q_db
);
300 nvmeq
->sq_tail
= tail
;
303 static __le64
**iod_list(struct request
*req
)
305 struct nvme_iod
*iod
= blk_mq_rq_to_pdu(req
);
306 return (__le64
**)(iod
->sg
+ blk_rq_nr_phys_segments(req
));
309 static int nvme_init_iod(struct request
*rq
, struct nvme_dev
*dev
)
311 struct nvme_iod
*iod
= blk_mq_rq_to_pdu(rq
);
312 int nseg
= blk_rq_nr_phys_segments(rq
);
313 unsigned int size
= blk_rq_payload_bytes(rq
);
315 if (nseg
> NVME_INT_PAGES
|| size
> NVME_INT_BYTES(dev
)) {
316 iod
->sg
= kmalloc(nvme_iod_alloc_size(dev
, size
, nseg
), GFP_ATOMIC
);
318 return BLK_MQ_RQ_QUEUE_BUSY
;
320 iod
->sg
= iod
->inline_sg
;
328 if (!(rq
->rq_flags
& RQF_DONTPREP
)) {
330 rq
->rq_flags
|= RQF_DONTPREP
;
332 return BLK_MQ_RQ_QUEUE_OK
;
335 static void nvme_free_iod(struct nvme_dev
*dev
, struct request
*req
)
337 struct nvme_iod
*iod
= blk_mq_rq_to_pdu(req
);
338 const int last_prp
= dev
->ctrl
.page_size
/ 8 - 1;
340 __le64
**list
= iod_list(req
);
341 dma_addr_t prp_dma
= iod
->first_dma
;
343 if (iod
->npages
== 0)
344 dma_pool_free(dev
->prp_small_pool
, list
[0], prp_dma
);
345 for (i
= 0; i
< iod
->npages
; i
++) {
346 __le64
*prp_list
= list
[i
];
347 dma_addr_t next_prp_dma
= le64_to_cpu(prp_list
[last_prp
]);
348 dma_pool_free(dev
->prp_page_pool
, prp_list
, prp_dma
);
349 prp_dma
= next_prp_dma
;
352 if (iod
->sg
!= iod
->inline_sg
)
356 #ifdef CONFIG_BLK_DEV_INTEGRITY
357 static void nvme_dif_prep(u32 p
, u32 v
, struct t10_pi_tuple
*pi
)
359 if (be32_to_cpu(pi
->ref_tag
) == v
)
360 pi
->ref_tag
= cpu_to_be32(p
);
363 static void nvme_dif_complete(u32 p
, u32 v
, struct t10_pi_tuple
*pi
)
365 if (be32_to_cpu(pi
->ref_tag
) == p
)
366 pi
->ref_tag
= cpu_to_be32(v
);
370 * nvme_dif_remap - remaps ref tags to bip seed and physical lba
372 * The virtual start sector is the one that was originally submitted by the
373 * block layer. Due to partitioning, MD/DM cloning, etc. the actual physical
374 * start sector may be different. Remap protection information to match the
375 * physical LBA on writes, and back to the original seed on reads.
377 * Type 0 and 3 do not have a ref tag, so no remapping required.
379 static void nvme_dif_remap(struct request
*req
,
380 void (*dif_swap
)(u32 p
, u32 v
, struct t10_pi_tuple
*pi
))
382 struct nvme_ns
*ns
= req
->rq_disk
->private_data
;
383 struct bio_integrity_payload
*bip
;
384 struct t10_pi_tuple
*pi
;
386 u32 i
, nlb
, ts
, phys
, virt
;
388 if (!ns
->pi_type
|| ns
->pi_type
== NVME_NS_DPS_PI_TYPE3
)
391 bip
= bio_integrity(req
->bio
);
395 pmap
= kmap_atomic(bip
->bip_vec
->bv_page
) + bip
->bip_vec
->bv_offset
;
398 virt
= bip_get_seed(bip
);
399 phys
= nvme_block_nr(ns
, blk_rq_pos(req
));
400 nlb
= (blk_rq_bytes(req
) >> ns
->lba_shift
);
401 ts
= ns
->disk
->queue
->integrity
.tuple_size
;
403 for (i
= 0; i
< nlb
; i
++, virt
++, phys
++) {
404 pi
= (struct t10_pi_tuple
*)p
;
405 dif_swap(phys
, virt
, pi
);
410 #else /* CONFIG_BLK_DEV_INTEGRITY */
411 static void nvme_dif_remap(struct request
*req
,
412 void (*dif_swap
)(u32 p
, u32 v
, struct t10_pi_tuple
*pi
))
415 static void nvme_dif_prep(u32 p
, u32 v
, struct t10_pi_tuple
*pi
)
418 static void nvme_dif_complete(u32 p
, u32 v
, struct t10_pi_tuple
*pi
)
423 static bool nvme_setup_prps(struct nvme_dev
*dev
, struct request
*req
)
425 struct nvme_iod
*iod
= blk_mq_rq_to_pdu(req
);
426 struct dma_pool
*pool
;
427 int length
= blk_rq_payload_bytes(req
);
428 struct scatterlist
*sg
= iod
->sg
;
429 int dma_len
= sg_dma_len(sg
);
430 u64 dma_addr
= sg_dma_address(sg
);
431 u32 page_size
= dev
->ctrl
.page_size
;
432 int offset
= dma_addr
& (page_size
- 1);
434 __le64
**list
= iod_list(req
);
438 length
-= (page_size
- offset
);
442 dma_len
-= (page_size
- offset
);
444 dma_addr
+= (page_size
- offset
);
447 dma_addr
= sg_dma_address(sg
);
448 dma_len
= sg_dma_len(sg
);
451 if (length
<= page_size
) {
452 iod
->first_dma
= dma_addr
;
456 nprps
= DIV_ROUND_UP(length
, page_size
);
457 if (nprps
<= (256 / 8)) {
458 pool
= dev
->prp_small_pool
;
461 pool
= dev
->prp_page_pool
;
465 prp_list
= dma_pool_alloc(pool
, GFP_ATOMIC
, &prp_dma
);
467 iod
->first_dma
= dma_addr
;
472 iod
->first_dma
= prp_dma
;
475 if (i
== page_size
>> 3) {
476 __le64
*old_prp_list
= prp_list
;
477 prp_list
= dma_pool_alloc(pool
, GFP_ATOMIC
, &prp_dma
);
480 list
[iod
->npages
++] = prp_list
;
481 prp_list
[0] = old_prp_list
[i
- 1];
482 old_prp_list
[i
- 1] = cpu_to_le64(prp_dma
);
485 prp_list
[i
++] = cpu_to_le64(dma_addr
);
486 dma_len
-= page_size
;
487 dma_addr
+= page_size
;
495 dma_addr
= sg_dma_address(sg
);
496 dma_len
= sg_dma_len(sg
);
502 static int nvme_map_data(struct nvme_dev
*dev
, struct request
*req
,
503 struct nvme_command
*cmnd
)
505 struct nvme_iod
*iod
= blk_mq_rq_to_pdu(req
);
506 struct request_queue
*q
= req
->q
;
507 enum dma_data_direction dma_dir
= rq_data_dir(req
) ?
508 DMA_TO_DEVICE
: DMA_FROM_DEVICE
;
509 int ret
= BLK_MQ_RQ_QUEUE_ERROR
;
511 sg_init_table(iod
->sg
, blk_rq_nr_phys_segments(req
));
512 iod
->nents
= blk_rq_map_sg(q
, req
, iod
->sg
);
516 ret
= BLK_MQ_RQ_QUEUE_BUSY
;
517 if (!dma_map_sg_attrs(dev
->dev
, iod
->sg
, iod
->nents
, dma_dir
,
521 if (!nvme_setup_prps(dev
, req
))
524 ret
= BLK_MQ_RQ_QUEUE_ERROR
;
525 if (blk_integrity_rq(req
)) {
526 if (blk_rq_count_integrity_sg(q
, req
->bio
) != 1)
529 sg_init_table(&iod
->meta_sg
, 1);
530 if (blk_rq_map_integrity_sg(q
, req
->bio
, &iod
->meta_sg
) != 1)
533 if (rq_data_dir(req
))
534 nvme_dif_remap(req
, nvme_dif_prep
);
536 if (!dma_map_sg(dev
->dev
, &iod
->meta_sg
, 1, dma_dir
))
540 cmnd
->rw
.dptr
.prp1
= cpu_to_le64(sg_dma_address(iod
->sg
));
541 cmnd
->rw
.dptr
.prp2
= cpu_to_le64(iod
->first_dma
);
542 if (blk_integrity_rq(req
))
543 cmnd
->rw
.metadata
= cpu_to_le64(sg_dma_address(&iod
->meta_sg
));
544 return BLK_MQ_RQ_QUEUE_OK
;
547 dma_unmap_sg(dev
->dev
, iod
->sg
, iod
->nents
, dma_dir
);
552 static void nvme_unmap_data(struct nvme_dev
*dev
, struct request
*req
)
554 struct nvme_iod
*iod
= blk_mq_rq_to_pdu(req
);
555 enum dma_data_direction dma_dir
= rq_data_dir(req
) ?
556 DMA_TO_DEVICE
: DMA_FROM_DEVICE
;
559 dma_unmap_sg(dev
->dev
, iod
->sg
, iod
->nents
, dma_dir
);
560 if (blk_integrity_rq(req
)) {
561 if (!rq_data_dir(req
))
562 nvme_dif_remap(req
, nvme_dif_complete
);
563 dma_unmap_sg(dev
->dev
, &iod
->meta_sg
, 1, dma_dir
);
567 nvme_cleanup_cmd(req
);
568 nvme_free_iod(dev
, req
);
572 * NOTE: ns is NULL when called on the admin queue.
574 static int nvme_queue_rq(struct blk_mq_hw_ctx
*hctx
,
575 const struct blk_mq_queue_data
*bd
)
577 struct nvme_ns
*ns
= hctx
->queue
->queuedata
;
578 struct nvme_queue
*nvmeq
= hctx
->driver_data
;
579 struct nvme_dev
*dev
= nvmeq
->dev
;
580 struct request
*req
= bd
->rq
;
581 struct nvme_command cmnd
;
582 int ret
= BLK_MQ_RQ_QUEUE_OK
;
585 * If formated with metadata, require the block layer provide a buffer
586 * unless this namespace is formated such that the metadata can be
587 * stripped/generated by the controller with PRACT=1.
589 if (ns
&& ns
->ms
&& !blk_integrity_rq(req
)) {
590 if (!(ns
->pi_type
&& ns
->ms
== 8) &&
591 req
->cmd_type
!= REQ_TYPE_DRV_PRIV
) {
592 blk_mq_end_request(req
, -EFAULT
);
593 return BLK_MQ_RQ_QUEUE_OK
;
597 ret
= nvme_setup_cmd(ns
, req
, &cmnd
);
598 if (ret
!= BLK_MQ_RQ_QUEUE_OK
)
601 ret
= nvme_init_iod(req
, dev
);
602 if (ret
!= BLK_MQ_RQ_QUEUE_OK
)
605 if (blk_rq_nr_phys_segments(req
))
606 ret
= nvme_map_data(dev
, req
, &cmnd
);
608 if (ret
!= BLK_MQ_RQ_QUEUE_OK
)
609 goto out_cleanup_iod
;
611 blk_mq_start_request(req
);
613 spin_lock_irq(&nvmeq
->q_lock
);
614 if (unlikely(nvmeq
->cq_vector
< 0)) {
615 if (ns
&& !test_bit(NVME_NS_DEAD
, &ns
->flags
))
616 ret
= BLK_MQ_RQ_QUEUE_BUSY
;
618 ret
= BLK_MQ_RQ_QUEUE_ERROR
;
619 spin_unlock_irq(&nvmeq
->q_lock
);
620 goto out_cleanup_iod
;
622 __nvme_submit_cmd(nvmeq
, &cmnd
);
623 nvme_process_cq(nvmeq
);
624 spin_unlock_irq(&nvmeq
->q_lock
);
625 return BLK_MQ_RQ_QUEUE_OK
;
627 nvme_free_iod(dev
, req
);
629 nvme_cleanup_cmd(req
);
633 static void nvme_complete_rq(struct request
*req
)
635 struct nvme_iod
*iod
= blk_mq_rq_to_pdu(req
);
636 struct nvme_dev
*dev
= iod
->nvmeq
->dev
;
639 nvme_unmap_data(dev
, req
);
641 if (unlikely(req
->errors
)) {
642 if (nvme_req_needs_retry(req
, req
->errors
)) {
644 nvme_requeue_req(req
);
648 if (req
->cmd_type
== REQ_TYPE_DRV_PRIV
)
651 error
= nvme_error_status(req
->errors
);
654 if (unlikely(iod
->aborted
)) {
655 dev_warn(dev
->ctrl
.device
,
656 "completing aborted command with status: %04x\n",
660 blk_mq_end_request(req
, error
);
663 /* We read the CQE phase first to check if the rest of the entry is valid */
664 static inline bool nvme_cqe_valid(struct nvme_queue
*nvmeq
, u16 head
,
667 return (le16_to_cpu(nvmeq
->cqes
[head
].status
) & 1) == phase
;
670 static void __nvme_process_cq(struct nvme_queue
*nvmeq
, unsigned int *tag
)
674 head
= nvmeq
->cq_head
;
675 phase
= nvmeq
->cq_phase
;
677 while (nvme_cqe_valid(nvmeq
, head
, phase
)) {
678 struct nvme_completion cqe
= nvmeq
->cqes
[head
];
681 if (++head
== nvmeq
->q_depth
) {
686 if (tag
&& *tag
== cqe
.command_id
)
689 if (unlikely(cqe
.command_id
>= nvmeq
->q_depth
)) {
690 dev_warn(nvmeq
->dev
->ctrl
.device
,
691 "invalid id %d completed on queue %d\n",
692 cqe
.command_id
, le16_to_cpu(cqe
.sq_id
));
697 * AEN requests are special as they don't time out and can
698 * survive any kind of queue freeze and often don't respond to
699 * aborts. We don't even bother to allocate a struct request
700 * for them but rather special case them here.
702 if (unlikely(nvmeq
->qid
== 0 &&
703 cqe
.command_id
>= NVME_AQ_BLKMQ_DEPTH
)) {
704 nvme_complete_async_event(&nvmeq
->dev
->ctrl
,
705 cqe
.status
, &cqe
.result
);
709 req
= blk_mq_tag_to_rq(*nvmeq
->tags
, cqe
.command_id
);
710 nvme_req(req
)->result
= cqe
.result
;
711 blk_mq_complete_request(req
, le16_to_cpu(cqe
.status
) >> 1);
714 if (head
== nvmeq
->cq_head
&& phase
== nvmeq
->cq_phase
)
717 if (likely(nvmeq
->cq_vector
>= 0))
718 writel(head
, nvmeq
->q_db
+ nvmeq
->dev
->db_stride
);
719 nvmeq
->cq_head
= head
;
720 nvmeq
->cq_phase
= phase
;
725 static void nvme_process_cq(struct nvme_queue
*nvmeq
)
727 __nvme_process_cq(nvmeq
, NULL
);
730 static irqreturn_t
nvme_irq(int irq
, void *data
)
733 struct nvme_queue
*nvmeq
= data
;
734 spin_lock(&nvmeq
->q_lock
);
735 nvme_process_cq(nvmeq
);
736 result
= nvmeq
->cqe_seen
? IRQ_HANDLED
: IRQ_NONE
;
738 spin_unlock(&nvmeq
->q_lock
);
742 static irqreturn_t
nvme_irq_check(int irq
, void *data
)
744 struct nvme_queue
*nvmeq
= data
;
745 if (nvme_cqe_valid(nvmeq
, nvmeq
->cq_head
, nvmeq
->cq_phase
))
746 return IRQ_WAKE_THREAD
;
750 static int nvme_poll(struct blk_mq_hw_ctx
*hctx
, unsigned int tag
)
752 struct nvme_queue
*nvmeq
= hctx
->driver_data
;
754 if (nvme_cqe_valid(nvmeq
, nvmeq
->cq_head
, nvmeq
->cq_phase
)) {
755 spin_lock_irq(&nvmeq
->q_lock
);
756 __nvme_process_cq(nvmeq
, &tag
);
757 spin_unlock_irq(&nvmeq
->q_lock
);
766 static void nvme_pci_submit_async_event(struct nvme_ctrl
*ctrl
, int aer_idx
)
768 struct nvme_dev
*dev
= to_nvme_dev(ctrl
);
769 struct nvme_queue
*nvmeq
= dev
->queues
[0];
770 struct nvme_command c
;
772 memset(&c
, 0, sizeof(c
));
773 c
.common
.opcode
= nvme_admin_async_event
;
774 c
.common
.command_id
= NVME_AQ_BLKMQ_DEPTH
+ aer_idx
;
776 spin_lock_irq(&nvmeq
->q_lock
);
777 __nvme_submit_cmd(nvmeq
, &c
);
778 spin_unlock_irq(&nvmeq
->q_lock
);
781 static int adapter_delete_queue(struct nvme_dev
*dev
, u8 opcode
, u16 id
)
783 struct nvme_command c
;
785 memset(&c
, 0, sizeof(c
));
786 c
.delete_queue
.opcode
= opcode
;
787 c
.delete_queue
.qid
= cpu_to_le16(id
);
789 return nvme_submit_sync_cmd(dev
->ctrl
.admin_q
, &c
, NULL
, 0);
792 static int adapter_alloc_cq(struct nvme_dev
*dev
, u16 qid
,
793 struct nvme_queue
*nvmeq
)
795 struct nvme_command c
;
796 int flags
= NVME_QUEUE_PHYS_CONTIG
| NVME_CQ_IRQ_ENABLED
;
799 * Note: we (ab)use the fact the the prp fields survive if no data
800 * is attached to the request.
802 memset(&c
, 0, sizeof(c
));
803 c
.create_cq
.opcode
= nvme_admin_create_cq
;
804 c
.create_cq
.prp1
= cpu_to_le64(nvmeq
->cq_dma_addr
);
805 c
.create_cq
.cqid
= cpu_to_le16(qid
);
806 c
.create_cq
.qsize
= cpu_to_le16(nvmeq
->q_depth
- 1);
807 c
.create_cq
.cq_flags
= cpu_to_le16(flags
);
808 c
.create_cq
.irq_vector
= cpu_to_le16(nvmeq
->cq_vector
);
810 return nvme_submit_sync_cmd(dev
->ctrl
.admin_q
, &c
, NULL
, 0);
813 static int adapter_alloc_sq(struct nvme_dev
*dev
, u16 qid
,
814 struct nvme_queue
*nvmeq
)
816 struct nvme_command c
;
817 int flags
= NVME_QUEUE_PHYS_CONTIG
| NVME_SQ_PRIO_MEDIUM
;
820 * Note: we (ab)use the fact the the prp fields survive if no data
821 * is attached to the request.
823 memset(&c
, 0, sizeof(c
));
824 c
.create_sq
.opcode
= nvme_admin_create_sq
;
825 c
.create_sq
.prp1
= cpu_to_le64(nvmeq
->sq_dma_addr
);
826 c
.create_sq
.sqid
= cpu_to_le16(qid
);
827 c
.create_sq
.qsize
= cpu_to_le16(nvmeq
->q_depth
- 1);
828 c
.create_sq
.sq_flags
= cpu_to_le16(flags
);
829 c
.create_sq
.cqid
= cpu_to_le16(qid
);
831 return nvme_submit_sync_cmd(dev
->ctrl
.admin_q
, &c
, NULL
, 0);
834 static int adapter_delete_cq(struct nvme_dev
*dev
, u16 cqid
)
836 return adapter_delete_queue(dev
, nvme_admin_delete_cq
, cqid
);
839 static int adapter_delete_sq(struct nvme_dev
*dev
, u16 sqid
)
841 return adapter_delete_queue(dev
, nvme_admin_delete_sq
, sqid
);
844 static void abort_endio(struct request
*req
, int error
)
846 struct nvme_iod
*iod
= blk_mq_rq_to_pdu(req
);
847 struct nvme_queue
*nvmeq
= iod
->nvmeq
;
848 u16 status
= req
->errors
;
850 dev_warn(nvmeq
->dev
->ctrl
.device
, "Abort status: 0x%x", status
);
851 atomic_inc(&nvmeq
->dev
->ctrl
.abort_limit
);
852 blk_mq_free_request(req
);
855 static enum blk_eh_timer_return
nvme_timeout(struct request
*req
, bool reserved
)
857 struct nvme_iod
*iod
= blk_mq_rq_to_pdu(req
);
858 struct nvme_queue
*nvmeq
= iod
->nvmeq
;
859 struct nvme_dev
*dev
= nvmeq
->dev
;
860 struct request
*abort_req
;
861 struct nvme_command cmd
;
864 * Shutdown immediately if controller times out while starting. The
865 * reset work will see the pci device disabled when it gets the forced
866 * cancellation error. All outstanding requests are completed on
867 * shutdown, so we return BLK_EH_HANDLED.
869 if (dev
->ctrl
.state
== NVME_CTRL_RESETTING
) {
870 dev_warn(dev
->ctrl
.device
,
871 "I/O %d QID %d timeout, disable controller\n",
872 req
->tag
, nvmeq
->qid
);
873 nvme_dev_disable(dev
, false);
874 req
->errors
= NVME_SC_CANCELLED
;
875 return BLK_EH_HANDLED
;
879 * Shutdown the controller immediately and schedule a reset if the
880 * command was already aborted once before and still hasn't been
881 * returned to the driver, or if this is the admin queue.
883 if (!nvmeq
->qid
|| iod
->aborted
) {
884 dev_warn(dev
->ctrl
.device
,
885 "I/O %d QID %d timeout, reset controller\n",
886 req
->tag
, nvmeq
->qid
);
887 nvme_dev_disable(dev
, false);
891 * Mark the request as handled, since the inline shutdown
892 * forces all outstanding requests to complete.
894 req
->errors
= NVME_SC_CANCELLED
;
895 return BLK_EH_HANDLED
;
900 if (atomic_dec_return(&dev
->ctrl
.abort_limit
) < 0) {
901 atomic_inc(&dev
->ctrl
.abort_limit
);
902 return BLK_EH_RESET_TIMER
;
905 memset(&cmd
, 0, sizeof(cmd
));
906 cmd
.abort
.opcode
= nvme_admin_abort_cmd
;
907 cmd
.abort
.cid
= req
->tag
;
908 cmd
.abort
.sqid
= cpu_to_le16(nvmeq
->qid
);
910 dev_warn(nvmeq
->dev
->ctrl
.device
,
911 "I/O %d QID %d timeout, aborting\n",
912 req
->tag
, nvmeq
->qid
);
914 abort_req
= nvme_alloc_request(dev
->ctrl
.admin_q
, &cmd
,
915 BLK_MQ_REQ_NOWAIT
, NVME_QID_ANY
);
916 if (IS_ERR(abort_req
)) {
917 atomic_inc(&dev
->ctrl
.abort_limit
);
918 return BLK_EH_RESET_TIMER
;
921 abort_req
->timeout
= ADMIN_TIMEOUT
;
922 abort_req
->end_io_data
= NULL
;
923 blk_execute_rq_nowait(abort_req
->q
, NULL
, abort_req
, 0, abort_endio
);
926 * The aborted req will be completed on receiving the abort req.
927 * We enable the timer again. If hit twice, it'll cause a device reset,
928 * as the device then is in a faulty state.
930 return BLK_EH_RESET_TIMER
;
933 static void nvme_free_queue(struct nvme_queue
*nvmeq
)
935 dma_free_coherent(nvmeq
->q_dmadev
, CQ_SIZE(nvmeq
->q_depth
),
936 (void *)nvmeq
->cqes
, nvmeq
->cq_dma_addr
);
938 dma_free_coherent(nvmeq
->q_dmadev
, SQ_SIZE(nvmeq
->q_depth
),
939 nvmeq
->sq_cmds
, nvmeq
->sq_dma_addr
);
943 static void nvme_free_queues(struct nvme_dev
*dev
, int lowest
)
947 for (i
= dev
->queue_count
- 1; i
>= lowest
; i
--) {
948 struct nvme_queue
*nvmeq
= dev
->queues
[i
];
950 dev
->queues
[i
] = NULL
;
951 nvme_free_queue(nvmeq
);
956 * nvme_suspend_queue - put queue into suspended state
957 * @nvmeq - queue to suspend
959 static int nvme_suspend_queue(struct nvme_queue
*nvmeq
)
963 spin_lock_irq(&nvmeq
->q_lock
);
964 if (nvmeq
->cq_vector
== -1) {
965 spin_unlock_irq(&nvmeq
->q_lock
);
968 vector
= nvmeq_irq(nvmeq
);
969 nvmeq
->dev
->online_queues
--;
970 nvmeq
->cq_vector
= -1;
971 spin_unlock_irq(&nvmeq
->q_lock
);
973 if (!nvmeq
->qid
&& nvmeq
->dev
->ctrl
.admin_q
)
974 blk_mq_stop_hw_queues(nvmeq
->dev
->ctrl
.admin_q
);
976 free_irq(vector
, nvmeq
);
981 static void nvme_disable_admin_queue(struct nvme_dev
*dev
, bool shutdown
)
983 struct nvme_queue
*nvmeq
= dev
->queues
[0];
987 if (nvme_suspend_queue(nvmeq
))
991 nvme_shutdown_ctrl(&dev
->ctrl
);
993 nvme_disable_ctrl(&dev
->ctrl
, lo_hi_readq(
994 dev
->bar
+ NVME_REG_CAP
));
996 spin_lock_irq(&nvmeq
->q_lock
);
997 nvme_process_cq(nvmeq
);
998 spin_unlock_irq(&nvmeq
->q_lock
);
1001 static int nvme_cmb_qdepth(struct nvme_dev
*dev
, int nr_io_queues
,
1004 int q_depth
= dev
->q_depth
;
1005 unsigned q_size_aligned
= roundup(q_depth
* entry_size
,
1006 dev
->ctrl
.page_size
);
1008 if (q_size_aligned
* nr_io_queues
> dev
->cmb_size
) {
1009 u64 mem_per_q
= div_u64(dev
->cmb_size
, nr_io_queues
);
1010 mem_per_q
= round_down(mem_per_q
, dev
->ctrl
.page_size
);
1011 q_depth
= div_u64(mem_per_q
, entry_size
);
1014 * Ensure the reduced q_depth is above some threshold where it
1015 * would be better to map queues in system memory with the
1025 static int nvme_alloc_sq_cmds(struct nvme_dev
*dev
, struct nvme_queue
*nvmeq
,
1028 if (qid
&& dev
->cmb
&& use_cmb_sqes
&& NVME_CMB_SQS(dev
->cmbsz
)) {
1029 unsigned offset
= (qid
- 1) * roundup(SQ_SIZE(depth
),
1030 dev
->ctrl
.page_size
);
1031 nvmeq
->sq_dma_addr
= dev
->cmb_dma_addr
+ offset
;
1032 nvmeq
->sq_cmds_io
= dev
->cmb
+ offset
;
1034 nvmeq
->sq_cmds
= dma_alloc_coherent(dev
->dev
, SQ_SIZE(depth
),
1035 &nvmeq
->sq_dma_addr
, GFP_KERNEL
);
1036 if (!nvmeq
->sq_cmds
)
1043 static struct nvme_queue
*nvme_alloc_queue(struct nvme_dev
*dev
, int qid
,
1046 struct nvme_queue
*nvmeq
= kzalloc(sizeof(*nvmeq
), GFP_KERNEL
);
1050 nvmeq
->cqes
= dma_zalloc_coherent(dev
->dev
, CQ_SIZE(depth
),
1051 &nvmeq
->cq_dma_addr
, GFP_KERNEL
);
1055 if (nvme_alloc_sq_cmds(dev
, nvmeq
, qid
, depth
))
1058 nvmeq
->q_dmadev
= dev
->dev
;
1060 snprintf(nvmeq
->irqname
, sizeof(nvmeq
->irqname
), "nvme%dq%d",
1061 dev
->ctrl
.instance
, qid
);
1062 spin_lock_init(&nvmeq
->q_lock
);
1064 nvmeq
->cq_phase
= 1;
1065 nvmeq
->q_db
= &dev
->dbs
[qid
* 2 * dev
->db_stride
];
1066 nvmeq
->q_depth
= depth
;
1068 nvmeq
->cq_vector
= -1;
1069 dev
->queues
[qid
] = nvmeq
;
1075 dma_free_coherent(dev
->dev
, CQ_SIZE(depth
), (void *)nvmeq
->cqes
,
1076 nvmeq
->cq_dma_addr
);
1082 static int queue_request_irq(struct nvme_queue
*nvmeq
)
1084 if (use_threaded_interrupts
)
1085 return request_threaded_irq(nvmeq_irq(nvmeq
), nvme_irq_check
,
1086 nvme_irq
, IRQF_SHARED
, nvmeq
->irqname
, nvmeq
);
1088 return request_irq(nvmeq_irq(nvmeq
), nvme_irq
, IRQF_SHARED
,
1089 nvmeq
->irqname
, nvmeq
);
1092 static void nvme_init_queue(struct nvme_queue
*nvmeq
, u16 qid
)
1094 struct nvme_dev
*dev
= nvmeq
->dev
;
1096 spin_lock_irq(&nvmeq
->q_lock
);
1099 nvmeq
->cq_phase
= 1;
1100 nvmeq
->q_db
= &dev
->dbs
[qid
* 2 * dev
->db_stride
];
1101 memset((void *)nvmeq
->cqes
, 0, CQ_SIZE(nvmeq
->q_depth
));
1102 dev
->online_queues
++;
1103 spin_unlock_irq(&nvmeq
->q_lock
);
1106 static int nvme_create_queue(struct nvme_queue
*nvmeq
, int qid
)
1108 struct nvme_dev
*dev
= nvmeq
->dev
;
1111 nvmeq
->cq_vector
= qid
- 1;
1112 result
= adapter_alloc_cq(dev
, qid
, nvmeq
);
1116 result
= adapter_alloc_sq(dev
, qid
, nvmeq
);
1120 result
= queue_request_irq(nvmeq
);
1124 nvme_init_queue(nvmeq
, qid
);
1128 adapter_delete_sq(dev
, qid
);
1130 adapter_delete_cq(dev
, qid
);
1134 static struct blk_mq_ops nvme_mq_admin_ops
= {
1135 .queue_rq
= nvme_queue_rq
,
1136 .complete
= nvme_complete_rq
,
1137 .init_hctx
= nvme_admin_init_hctx
,
1138 .exit_hctx
= nvme_admin_exit_hctx
,
1139 .init_request
= nvme_admin_init_request
,
1140 .timeout
= nvme_timeout
,
1143 static struct blk_mq_ops nvme_mq_ops
= {
1144 .queue_rq
= nvme_queue_rq
,
1145 .complete
= nvme_complete_rq
,
1146 .init_hctx
= nvme_init_hctx
,
1147 .init_request
= nvme_init_request
,
1148 .map_queues
= nvme_pci_map_queues
,
1149 .timeout
= nvme_timeout
,
1153 static void nvme_dev_remove_admin(struct nvme_dev
*dev
)
1155 if (dev
->ctrl
.admin_q
&& !blk_queue_dying(dev
->ctrl
.admin_q
)) {
1157 * If the controller was reset during removal, it's possible
1158 * user requests may be waiting on a stopped queue. Start the
1159 * queue to flush these to completion.
1161 blk_mq_start_stopped_hw_queues(dev
->ctrl
.admin_q
, true);
1162 blk_cleanup_queue(dev
->ctrl
.admin_q
);
1163 blk_mq_free_tag_set(&dev
->admin_tagset
);
1167 static int nvme_alloc_admin_tags(struct nvme_dev
*dev
)
1169 if (!dev
->ctrl
.admin_q
) {
1170 dev
->admin_tagset
.ops
= &nvme_mq_admin_ops
;
1171 dev
->admin_tagset
.nr_hw_queues
= 1;
1174 * Subtract one to leave an empty queue entry for 'Full Queue'
1175 * condition. See NVM-Express 1.2 specification, section 4.1.2.
1177 dev
->admin_tagset
.queue_depth
= NVME_AQ_BLKMQ_DEPTH
- 1;
1178 dev
->admin_tagset
.timeout
= ADMIN_TIMEOUT
;
1179 dev
->admin_tagset
.numa_node
= dev_to_node(dev
->dev
);
1180 dev
->admin_tagset
.cmd_size
= nvme_cmd_size(dev
);
1181 dev
->admin_tagset
.driver_data
= dev
;
1183 if (blk_mq_alloc_tag_set(&dev
->admin_tagset
))
1186 dev
->ctrl
.admin_q
= blk_mq_init_queue(&dev
->admin_tagset
);
1187 if (IS_ERR(dev
->ctrl
.admin_q
)) {
1188 blk_mq_free_tag_set(&dev
->admin_tagset
);
1191 if (!blk_get_queue(dev
->ctrl
.admin_q
)) {
1192 nvme_dev_remove_admin(dev
);
1193 dev
->ctrl
.admin_q
= NULL
;
1197 blk_mq_start_stopped_hw_queues(dev
->ctrl
.admin_q
, true);
1202 static int nvme_configure_admin_queue(struct nvme_dev
*dev
)
1206 u64 cap
= lo_hi_readq(dev
->bar
+ NVME_REG_CAP
);
1207 struct nvme_queue
*nvmeq
;
1209 dev
->subsystem
= readl(dev
->bar
+ NVME_REG_VS
) >= NVME_VS(1, 1, 0) ?
1210 NVME_CAP_NSSRC(cap
) : 0;
1212 if (dev
->subsystem
&&
1213 (readl(dev
->bar
+ NVME_REG_CSTS
) & NVME_CSTS_NSSRO
))
1214 writel(NVME_CSTS_NSSRO
, dev
->bar
+ NVME_REG_CSTS
);
1216 result
= nvme_disable_ctrl(&dev
->ctrl
, cap
);
1220 nvmeq
= dev
->queues
[0];
1222 nvmeq
= nvme_alloc_queue(dev
, 0, NVME_AQ_DEPTH
);
1227 aqa
= nvmeq
->q_depth
- 1;
1230 writel(aqa
, dev
->bar
+ NVME_REG_AQA
);
1231 lo_hi_writeq(nvmeq
->sq_dma_addr
, dev
->bar
+ NVME_REG_ASQ
);
1232 lo_hi_writeq(nvmeq
->cq_dma_addr
, dev
->bar
+ NVME_REG_ACQ
);
1234 result
= nvme_enable_ctrl(&dev
->ctrl
, cap
);
1238 nvmeq
->cq_vector
= 0;
1239 result
= queue_request_irq(nvmeq
);
1241 nvmeq
->cq_vector
= -1;
1248 static bool nvme_should_reset(struct nvme_dev
*dev
, u32 csts
)
1251 /* If true, indicates loss of adapter communication, possibly by a
1252 * NVMe Subsystem reset.
1254 bool nssro
= dev
->subsystem
&& (csts
& NVME_CSTS_NSSRO
);
1256 /* If there is a reset ongoing, we shouldn't reset again. */
1257 if (work_busy(&dev
->reset_work
))
1260 /* We shouldn't reset unless the controller is on fatal error state
1261 * _or_ if we lost the communication with it.
1263 if (!(csts
& NVME_CSTS_CFS
) && !nssro
)
1266 /* If PCI error recovery process is happening, we cannot reset or
1267 * the recovery mechanism will surely fail.
1269 if (pci_channel_offline(to_pci_dev(dev
->dev
)))
1275 static void nvme_warn_reset(struct nvme_dev
*dev
, u32 csts
)
1277 /* Read a config register to help see what died. */
1281 result
= pci_read_config_word(to_pci_dev(dev
->dev
), PCI_STATUS
,
1283 if (result
== PCIBIOS_SUCCESSFUL
)
1285 "controller is down; will reset: CSTS=0x%x, PCI_STATUS=0x%hx\n",
1289 "controller is down; will reset: CSTS=0x%x, PCI_STATUS read failed (%d)\n",
1293 static void nvme_watchdog_timer(unsigned long data
)
1295 struct nvme_dev
*dev
= (struct nvme_dev
*)data
;
1296 u32 csts
= readl(dev
->bar
+ NVME_REG_CSTS
);
1298 /* Skip controllers under certain specific conditions. */
1299 if (nvme_should_reset(dev
, csts
)) {
1300 if (!nvme_reset(dev
))
1301 nvme_warn_reset(dev
, csts
);
1305 mod_timer(&dev
->watchdog_timer
, round_jiffies(jiffies
+ HZ
));
1308 static int nvme_create_io_queues(struct nvme_dev
*dev
)
1313 for (i
= dev
->queue_count
; i
<= dev
->max_qid
; i
++) {
1314 if (!nvme_alloc_queue(dev
, i
, dev
->q_depth
)) {
1320 max
= min(dev
->max_qid
, dev
->queue_count
- 1);
1321 for (i
= dev
->online_queues
; i
<= max
; i
++) {
1322 ret
= nvme_create_queue(dev
->queues
[i
], i
);
1328 * Ignore failing Create SQ/CQ commands, we can continue with less
1329 * than the desired aount of queues, and even a controller without
1330 * I/O queues an still be used to issue admin commands. This might
1331 * be useful to upgrade a buggy firmware for example.
1333 return ret
>= 0 ? 0 : ret
;
1336 static ssize_t
nvme_cmb_show(struct device
*dev
,
1337 struct device_attribute
*attr
,
1340 struct nvme_dev
*ndev
= to_nvme_dev(dev_get_drvdata(dev
));
1342 return scnprintf(buf
, PAGE_SIZE
, "cmbloc : x%08x\ncmbsz : x%08x\n",
1343 ndev
->cmbloc
, ndev
->cmbsz
);
1345 static DEVICE_ATTR(cmb
, S_IRUGO
, nvme_cmb_show
, NULL
);
1347 static void __iomem
*nvme_map_cmb(struct nvme_dev
*dev
)
1349 u64 szu
, size
, offset
;
1350 resource_size_t bar_size
;
1351 struct pci_dev
*pdev
= to_pci_dev(dev
->dev
);
1353 dma_addr_t dma_addr
;
1355 dev
->cmbsz
= readl(dev
->bar
+ NVME_REG_CMBSZ
);
1356 if (!(NVME_CMB_SZ(dev
->cmbsz
)))
1358 dev
->cmbloc
= readl(dev
->bar
+ NVME_REG_CMBLOC
);
1363 szu
= (u64
)1 << (12 + 4 * NVME_CMB_SZU(dev
->cmbsz
));
1364 size
= szu
* NVME_CMB_SZ(dev
->cmbsz
);
1365 offset
= szu
* NVME_CMB_OFST(dev
->cmbloc
);
1366 bar_size
= pci_resource_len(pdev
, NVME_CMB_BIR(dev
->cmbloc
));
1368 if (offset
> bar_size
)
1372 * Controllers may support a CMB size larger than their BAR,
1373 * for example, due to being behind a bridge. Reduce the CMB to
1374 * the reported size of the BAR
1376 if (size
> bar_size
- offset
)
1377 size
= bar_size
- offset
;
1379 dma_addr
= pci_resource_start(pdev
, NVME_CMB_BIR(dev
->cmbloc
)) + offset
;
1380 cmb
= ioremap_wc(dma_addr
, size
);
1384 dev
->cmb_dma_addr
= dma_addr
;
1385 dev
->cmb_size
= size
;
1389 static inline void nvme_release_cmb(struct nvme_dev
*dev
)
1397 static size_t db_bar_size(struct nvme_dev
*dev
, unsigned nr_io_queues
)
1399 return 4096 + ((nr_io_queues
+ 1) * 8 * dev
->db_stride
);
1402 static int nvme_setup_io_queues(struct nvme_dev
*dev
)
1404 struct nvme_queue
*adminq
= dev
->queues
[0];
1405 struct pci_dev
*pdev
= to_pci_dev(dev
->dev
);
1406 int result
, nr_io_queues
, size
;
1408 nr_io_queues
= num_online_cpus();
1409 result
= nvme_set_queue_count(&dev
->ctrl
, &nr_io_queues
);
1413 if (nr_io_queues
== 0)
1416 if (dev
->cmb
&& NVME_CMB_SQS(dev
->cmbsz
)) {
1417 result
= nvme_cmb_qdepth(dev
, nr_io_queues
,
1418 sizeof(struct nvme_command
));
1420 dev
->q_depth
= result
;
1422 nvme_release_cmb(dev
);
1425 size
= db_bar_size(dev
, nr_io_queues
);
1429 dev
->bar
= ioremap(pci_resource_start(pdev
, 0), size
);
1432 if (!--nr_io_queues
)
1434 size
= db_bar_size(dev
, nr_io_queues
);
1436 dev
->dbs
= dev
->bar
+ 4096;
1437 adminq
->q_db
= dev
->dbs
;
1440 /* Deregister the admin queue's interrupt */
1441 free_irq(pci_irq_vector(pdev
, 0), adminq
);
1444 * If we enable msix early due to not intx, disable it again before
1445 * setting up the full range we need.
1447 pci_free_irq_vectors(pdev
);
1448 nr_io_queues
= pci_alloc_irq_vectors(pdev
, 1, nr_io_queues
,
1449 PCI_IRQ_ALL_TYPES
| PCI_IRQ_AFFINITY
);
1450 if (nr_io_queues
<= 0)
1452 dev
->max_qid
= nr_io_queues
;
1455 * Should investigate if there's a performance win from allocating
1456 * more queues than interrupt vectors; it might allow the submission
1457 * path to scale better, even if the receive path is limited by the
1458 * number of interrupts.
1461 result
= queue_request_irq(adminq
);
1463 adminq
->cq_vector
= -1;
1466 return nvme_create_io_queues(dev
);
1469 static void nvme_del_queue_end(struct request
*req
, int error
)
1471 struct nvme_queue
*nvmeq
= req
->end_io_data
;
1473 blk_mq_free_request(req
);
1474 complete(&nvmeq
->dev
->ioq_wait
);
1477 static void nvme_del_cq_end(struct request
*req
, int error
)
1479 struct nvme_queue
*nvmeq
= req
->end_io_data
;
1482 unsigned long flags
;
1485 * We might be called with the AQ q_lock held
1486 * and the I/O queue q_lock should always
1487 * nest inside the AQ one.
1489 spin_lock_irqsave_nested(&nvmeq
->q_lock
, flags
,
1490 SINGLE_DEPTH_NESTING
);
1491 nvme_process_cq(nvmeq
);
1492 spin_unlock_irqrestore(&nvmeq
->q_lock
, flags
);
1495 nvme_del_queue_end(req
, error
);
1498 static int nvme_delete_queue(struct nvme_queue
*nvmeq
, u8 opcode
)
1500 struct request_queue
*q
= nvmeq
->dev
->ctrl
.admin_q
;
1501 struct request
*req
;
1502 struct nvme_command cmd
;
1504 memset(&cmd
, 0, sizeof(cmd
));
1505 cmd
.delete_queue
.opcode
= opcode
;
1506 cmd
.delete_queue
.qid
= cpu_to_le16(nvmeq
->qid
);
1508 req
= nvme_alloc_request(q
, &cmd
, BLK_MQ_REQ_NOWAIT
, NVME_QID_ANY
);
1510 return PTR_ERR(req
);
1512 req
->timeout
= ADMIN_TIMEOUT
;
1513 req
->end_io_data
= nvmeq
;
1515 blk_execute_rq_nowait(q
, NULL
, req
, false,
1516 opcode
== nvme_admin_delete_cq
?
1517 nvme_del_cq_end
: nvme_del_queue_end
);
1521 static void nvme_disable_io_queues(struct nvme_dev
*dev
, int queues
)
1524 unsigned long timeout
;
1525 u8 opcode
= nvme_admin_delete_sq
;
1527 for (pass
= 0; pass
< 2; pass
++) {
1528 int sent
= 0, i
= queues
;
1530 reinit_completion(&dev
->ioq_wait
);
1532 timeout
= ADMIN_TIMEOUT
;
1533 for (; i
> 0; i
--, sent
++)
1534 if (nvme_delete_queue(dev
->queues
[i
], opcode
))
1538 timeout
= wait_for_completion_io_timeout(&dev
->ioq_wait
, timeout
);
1544 opcode
= nvme_admin_delete_cq
;
1549 * Return: error value if an error occurred setting up the queues or calling
1550 * Identify Device. 0 if these succeeded, even if adding some of the
1551 * namespaces failed. At the moment, these failures are silent. TBD which
1552 * failures should be reported.
1554 static int nvme_dev_add(struct nvme_dev
*dev
)
1556 if (!dev
->ctrl
.tagset
) {
1557 dev
->tagset
.ops
= &nvme_mq_ops
;
1558 dev
->tagset
.nr_hw_queues
= dev
->online_queues
- 1;
1559 dev
->tagset
.timeout
= NVME_IO_TIMEOUT
;
1560 dev
->tagset
.numa_node
= dev_to_node(dev
->dev
);
1561 dev
->tagset
.queue_depth
=
1562 min_t(int, dev
->q_depth
, BLK_MQ_MAX_DEPTH
) - 1;
1563 dev
->tagset
.cmd_size
= nvme_cmd_size(dev
);
1564 dev
->tagset
.flags
= BLK_MQ_F_SHOULD_MERGE
;
1565 dev
->tagset
.driver_data
= dev
;
1567 if (blk_mq_alloc_tag_set(&dev
->tagset
))
1569 dev
->ctrl
.tagset
= &dev
->tagset
;
1571 blk_mq_update_nr_hw_queues(&dev
->tagset
, dev
->online_queues
- 1);
1573 /* Free previously allocated queues that are no longer usable */
1574 nvme_free_queues(dev
, dev
->online_queues
);
1580 static int nvme_pci_enable(struct nvme_dev
*dev
)
1583 int result
= -ENOMEM
;
1584 struct pci_dev
*pdev
= to_pci_dev(dev
->dev
);
1586 if (pci_enable_device_mem(pdev
))
1589 pci_set_master(pdev
);
1591 if (dma_set_mask_and_coherent(dev
->dev
, DMA_BIT_MASK(64)) &&
1592 dma_set_mask_and_coherent(dev
->dev
, DMA_BIT_MASK(32)))
1595 if (readl(dev
->bar
+ NVME_REG_CSTS
) == -1) {
1601 * Some devices and/or platforms don't advertise or work with INTx
1602 * interrupts. Pre-enable a single MSIX or MSI vec for setup. We'll
1603 * adjust this later.
1605 result
= pci_alloc_irq_vectors(pdev
, 1, 1, PCI_IRQ_ALL_TYPES
);
1609 cap
= lo_hi_readq(dev
->bar
+ NVME_REG_CAP
);
1611 dev
->q_depth
= min_t(int, NVME_CAP_MQES(cap
) + 1, NVME_Q_DEPTH
);
1612 dev
->db_stride
= 1 << NVME_CAP_STRIDE(cap
);
1613 dev
->dbs
= dev
->bar
+ 4096;
1616 * Temporary fix for the Apple controller found in the MacBook8,1 and
1617 * some MacBook7,1 to avoid controller resets and data loss.
1619 if (pdev
->vendor
== PCI_VENDOR_ID_APPLE
&& pdev
->device
== 0x2001) {
1621 dev_warn(dev
->dev
, "detected Apple NVMe controller, set "
1622 "queue depth=%u to work around controller resets\n",
1627 * CMBs can currently only exist on >=1.2 PCIe devices. We only
1628 * populate sysfs if a CMB is implemented. Note that we add the
1629 * CMB attribute to the nvme_ctrl kobj which removes the need to remove
1630 * it on exit. Since nvme_dev_attrs_group has no name we can pass
1631 * NULL as final argument to sysfs_add_file_to_group.
1634 if (readl(dev
->bar
+ NVME_REG_VS
) >= NVME_VS(1, 2, 0)) {
1635 dev
->cmb
= nvme_map_cmb(dev
);
1638 if (sysfs_add_file_to_group(&dev
->ctrl
.device
->kobj
,
1639 &dev_attr_cmb
.attr
, NULL
))
1641 "failed to add sysfs attribute for CMB\n");
1645 pci_enable_pcie_error_reporting(pdev
);
1646 pci_save_state(pdev
);
1650 pci_disable_device(pdev
);
1654 static void nvme_dev_unmap(struct nvme_dev
*dev
)
1658 pci_release_mem_regions(to_pci_dev(dev
->dev
));
1661 static void nvme_pci_disable(struct nvme_dev
*dev
)
1663 struct pci_dev
*pdev
= to_pci_dev(dev
->dev
);
1665 pci_free_irq_vectors(pdev
);
1667 if (pci_is_enabled(pdev
)) {
1668 pci_disable_pcie_error_reporting(pdev
);
1669 pci_disable_device(pdev
);
1673 static void nvme_dev_disable(struct nvme_dev
*dev
, bool shutdown
)
1678 del_timer_sync(&dev
->watchdog_timer
);
1680 mutex_lock(&dev
->shutdown_lock
);
1681 if (pci_is_enabled(to_pci_dev(dev
->dev
))) {
1682 nvme_stop_queues(&dev
->ctrl
);
1683 csts
= readl(dev
->bar
+ NVME_REG_CSTS
);
1686 queues
= dev
->online_queues
- 1;
1687 for (i
= dev
->queue_count
- 1; i
> 0; i
--)
1688 nvme_suspend_queue(dev
->queues
[i
]);
1690 if (csts
& NVME_CSTS_CFS
|| !(csts
& NVME_CSTS_RDY
)) {
1691 /* A device might become IO incapable very soon during
1692 * probe, before the admin queue is configured. Thus,
1693 * queue_count can be 0 here.
1695 if (dev
->queue_count
)
1696 nvme_suspend_queue(dev
->queues
[0]);
1698 nvme_disable_io_queues(dev
, queues
);
1699 nvme_disable_admin_queue(dev
, shutdown
);
1701 nvme_pci_disable(dev
);
1703 blk_mq_tagset_busy_iter(&dev
->tagset
, nvme_cancel_request
, &dev
->ctrl
);
1704 blk_mq_tagset_busy_iter(&dev
->admin_tagset
, nvme_cancel_request
, &dev
->ctrl
);
1705 mutex_unlock(&dev
->shutdown_lock
);
1708 static int nvme_setup_prp_pools(struct nvme_dev
*dev
)
1710 dev
->prp_page_pool
= dma_pool_create("prp list page", dev
->dev
,
1711 PAGE_SIZE
, PAGE_SIZE
, 0);
1712 if (!dev
->prp_page_pool
)
1715 /* Optimisation for I/Os between 4k and 128k */
1716 dev
->prp_small_pool
= dma_pool_create("prp list 256", dev
->dev
,
1718 if (!dev
->prp_small_pool
) {
1719 dma_pool_destroy(dev
->prp_page_pool
);
1725 static void nvme_release_prp_pools(struct nvme_dev
*dev
)
1727 dma_pool_destroy(dev
->prp_page_pool
);
1728 dma_pool_destroy(dev
->prp_small_pool
);
1731 static void nvme_pci_free_ctrl(struct nvme_ctrl
*ctrl
)
1733 struct nvme_dev
*dev
= to_nvme_dev(ctrl
);
1735 put_device(dev
->dev
);
1736 if (dev
->tagset
.tags
)
1737 blk_mq_free_tag_set(&dev
->tagset
);
1738 if (dev
->ctrl
.admin_q
)
1739 blk_put_queue(dev
->ctrl
.admin_q
);
1744 static void nvme_remove_dead_ctrl(struct nvme_dev
*dev
, int status
)
1746 dev_warn(dev
->ctrl
.device
, "Removing after probe failure status: %d\n", status
);
1748 kref_get(&dev
->ctrl
.kref
);
1749 nvme_dev_disable(dev
, false);
1750 if (!schedule_work(&dev
->remove_work
))
1751 nvme_put_ctrl(&dev
->ctrl
);
1754 static void nvme_reset_work(struct work_struct
*work
)
1756 struct nvme_dev
*dev
= container_of(work
, struct nvme_dev
, reset_work
);
1757 int result
= -ENODEV
;
1759 if (WARN_ON(dev
->ctrl
.state
== NVME_CTRL_RESETTING
))
1763 * If we're called to reset a live controller first shut it down before
1766 if (dev
->ctrl
.ctrl_config
& NVME_CC_ENABLE
)
1767 nvme_dev_disable(dev
, false);
1769 if (!nvme_change_ctrl_state(&dev
->ctrl
, NVME_CTRL_RESETTING
))
1772 result
= nvme_pci_enable(dev
);
1776 result
= nvme_configure_admin_queue(dev
);
1780 nvme_init_queue(dev
->queues
[0], 0);
1781 result
= nvme_alloc_admin_tags(dev
);
1785 result
= nvme_init_identify(&dev
->ctrl
);
1789 result
= nvme_setup_io_queues(dev
);
1794 * A controller that can not execute IO typically requires user
1795 * intervention to correct. For such degraded controllers, the driver
1796 * should not submit commands the user did not request, so skip
1797 * registering for asynchronous event notification on this condition.
1799 if (dev
->online_queues
> 1)
1800 nvme_queue_async_events(&dev
->ctrl
);
1802 mod_timer(&dev
->watchdog_timer
, round_jiffies(jiffies
+ HZ
));
1805 * Keep the controller around but remove all namespaces if we don't have
1806 * any working I/O queue.
1808 if (dev
->online_queues
< 2) {
1809 dev_warn(dev
->ctrl
.device
, "IO queues not created\n");
1810 nvme_kill_queues(&dev
->ctrl
);
1811 nvme_remove_namespaces(&dev
->ctrl
);
1813 nvme_start_queues(&dev
->ctrl
);
1817 if (!nvme_change_ctrl_state(&dev
->ctrl
, NVME_CTRL_LIVE
)) {
1818 dev_warn(dev
->ctrl
.device
, "failed to mark controller live\n");
1822 if (dev
->online_queues
> 1)
1823 nvme_queue_scan(&dev
->ctrl
);
1827 nvme_remove_dead_ctrl(dev
, result
);
1830 static void nvme_remove_dead_ctrl_work(struct work_struct
*work
)
1832 struct nvme_dev
*dev
= container_of(work
, struct nvme_dev
, remove_work
);
1833 struct pci_dev
*pdev
= to_pci_dev(dev
->dev
);
1835 nvme_kill_queues(&dev
->ctrl
);
1836 if (pci_get_drvdata(pdev
))
1837 device_release_driver(&pdev
->dev
);
1838 nvme_put_ctrl(&dev
->ctrl
);
1841 static int nvme_reset(struct nvme_dev
*dev
)
1843 if (!dev
->ctrl
.admin_q
|| blk_queue_dying(dev
->ctrl
.admin_q
))
1845 if (work_busy(&dev
->reset_work
))
1847 if (!queue_work(nvme_workq
, &dev
->reset_work
))
1852 static int nvme_pci_reg_read32(struct nvme_ctrl
*ctrl
, u32 off
, u32
*val
)
1854 *val
= readl(to_nvme_dev(ctrl
)->bar
+ off
);
1858 static int nvme_pci_reg_write32(struct nvme_ctrl
*ctrl
, u32 off
, u32 val
)
1860 writel(val
, to_nvme_dev(ctrl
)->bar
+ off
);
1864 static int nvme_pci_reg_read64(struct nvme_ctrl
*ctrl
, u32 off
, u64
*val
)
1866 *val
= readq(to_nvme_dev(ctrl
)->bar
+ off
);
1870 static int nvme_pci_reset_ctrl(struct nvme_ctrl
*ctrl
)
1872 struct nvme_dev
*dev
= to_nvme_dev(ctrl
);
1873 int ret
= nvme_reset(dev
);
1876 flush_work(&dev
->reset_work
);
1880 static const struct nvme_ctrl_ops nvme_pci_ctrl_ops
= {
1882 .module
= THIS_MODULE
,
1883 .reg_read32
= nvme_pci_reg_read32
,
1884 .reg_write32
= nvme_pci_reg_write32
,
1885 .reg_read64
= nvme_pci_reg_read64
,
1886 .reset_ctrl
= nvme_pci_reset_ctrl
,
1887 .free_ctrl
= nvme_pci_free_ctrl
,
1888 .submit_async_event
= nvme_pci_submit_async_event
,
1891 static int nvme_dev_map(struct nvme_dev
*dev
)
1893 struct pci_dev
*pdev
= to_pci_dev(dev
->dev
);
1895 if (pci_request_mem_regions(pdev
, "nvme"))
1898 dev
->bar
= ioremap(pci_resource_start(pdev
, 0), 8192);
1904 pci_release_mem_regions(pdev
);
1908 static int nvme_probe(struct pci_dev
*pdev
, const struct pci_device_id
*id
)
1910 int node
, result
= -ENOMEM
;
1911 struct nvme_dev
*dev
;
1913 node
= dev_to_node(&pdev
->dev
);
1914 if (node
== NUMA_NO_NODE
)
1915 set_dev_node(&pdev
->dev
, first_memory_node
);
1917 dev
= kzalloc_node(sizeof(*dev
), GFP_KERNEL
, node
);
1920 dev
->queues
= kzalloc_node((num_possible_cpus() + 1) * sizeof(void *),
1925 dev
->dev
= get_device(&pdev
->dev
);
1926 pci_set_drvdata(pdev
, dev
);
1928 result
= nvme_dev_map(dev
);
1932 INIT_WORK(&dev
->reset_work
, nvme_reset_work
);
1933 INIT_WORK(&dev
->remove_work
, nvme_remove_dead_ctrl_work
);
1934 setup_timer(&dev
->watchdog_timer
, nvme_watchdog_timer
,
1935 (unsigned long)dev
);
1936 mutex_init(&dev
->shutdown_lock
);
1937 init_completion(&dev
->ioq_wait
);
1939 result
= nvme_setup_prp_pools(dev
);
1943 result
= nvme_init_ctrl(&dev
->ctrl
, &pdev
->dev
, &nvme_pci_ctrl_ops
,
1948 dev_info(dev
->ctrl
.device
, "pci function %s\n", dev_name(&pdev
->dev
));
1950 queue_work(nvme_workq
, &dev
->reset_work
);
1954 nvme_release_prp_pools(dev
);
1956 put_device(dev
->dev
);
1957 nvme_dev_unmap(dev
);
1964 static void nvme_reset_notify(struct pci_dev
*pdev
, bool prepare
)
1966 struct nvme_dev
*dev
= pci_get_drvdata(pdev
);
1969 nvme_dev_disable(dev
, false);
1974 static void nvme_shutdown(struct pci_dev
*pdev
)
1976 struct nvme_dev
*dev
= pci_get_drvdata(pdev
);
1977 nvme_dev_disable(dev
, true);
1981 * The driver's remove may be called on a device in a partially initialized
1982 * state. This function must not have any dependencies on the device state in
1985 static void nvme_remove(struct pci_dev
*pdev
)
1987 struct nvme_dev
*dev
= pci_get_drvdata(pdev
);
1989 nvme_change_ctrl_state(&dev
->ctrl
, NVME_CTRL_DELETING
);
1991 pci_set_drvdata(pdev
, NULL
);
1993 if (!pci_device_is_present(pdev
))
1994 nvme_change_ctrl_state(&dev
->ctrl
, NVME_CTRL_DEAD
);
1996 flush_work(&dev
->reset_work
);
1997 nvme_uninit_ctrl(&dev
->ctrl
);
1998 nvme_dev_disable(dev
, true);
1999 nvme_dev_remove_admin(dev
);
2000 nvme_free_queues(dev
, 0);
2001 nvme_release_cmb(dev
);
2002 nvme_release_prp_pools(dev
);
2003 nvme_dev_unmap(dev
);
2004 nvme_put_ctrl(&dev
->ctrl
);
2007 static int nvme_pci_sriov_configure(struct pci_dev
*pdev
, int numvfs
)
2012 if (pci_vfs_assigned(pdev
)) {
2013 dev_warn(&pdev
->dev
,
2014 "Cannot disable SR-IOV VFs while assigned\n");
2017 pci_disable_sriov(pdev
);
2021 ret
= pci_enable_sriov(pdev
, numvfs
);
2022 return ret
? ret
: numvfs
;
2025 #ifdef CONFIG_PM_SLEEP
2026 static int nvme_suspend(struct device
*dev
)
2028 struct pci_dev
*pdev
= to_pci_dev(dev
);
2029 struct nvme_dev
*ndev
= pci_get_drvdata(pdev
);
2031 nvme_dev_disable(ndev
, true);
2035 static int nvme_resume(struct device
*dev
)
2037 struct pci_dev
*pdev
= to_pci_dev(dev
);
2038 struct nvme_dev
*ndev
= pci_get_drvdata(pdev
);
2045 static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops
, nvme_suspend
, nvme_resume
);
2047 static pci_ers_result_t
nvme_error_detected(struct pci_dev
*pdev
,
2048 pci_channel_state_t state
)
2050 struct nvme_dev
*dev
= pci_get_drvdata(pdev
);
2053 * A frozen channel requires a reset. When detected, this method will
2054 * shutdown the controller to quiesce. The controller will be restarted
2055 * after the slot reset through driver's slot_reset callback.
2058 case pci_channel_io_normal
:
2059 return PCI_ERS_RESULT_CAN_RECOVER
;
2060 case pci_channel_io_frozen
:
2061 dev_warn(dev
->ctrl
.device
,
2062 "frozen state error detected, reset controller\n");
2063 nvme_dev_disable(dev
, false);
2064 return PCI_ERS_RESULT_NEED_RESET
;
2065 case pci_channel_io_perm_failure
:
2066 dev_warn(dev
->ctrl
.device
,
2067 "failure state error detected, request disconnect\n");
2068 return PCI_ERS_RESULT_DISCONNECT
;
2070 return PCI_ERS_RESULT_NEED_RESET
;
2073 static pci_ers_result_t
nvme_slot_reset(struct pci_dev
*pdev
)
2075 struct nvme_dev
*dev
= pci_get_drvdata(pdev
);
2077 dev_info(dev
->ctrl
.device
, "restart after slot reset\n");
2078 pci_restore_state(pdev
);
2080 return PCI_ERS_RESULT_RECOVERED
;
2083 static void nvme_error_resume(struct pci_dev
*pdev
)
2085 pci_cleanup_aer_uncorrect_error_status(pdev
);
2088 static const struct pci_error_handlers nvme_err_handler
= {
2089 .error_detected
= nvme_error_detected
,
2090 .slot_reset
= nvme_slot_reset
,
2091 .resume
= nvme_error_resume
,
2092 .reset_notify
= nvme_reset_notify
,
2095 static const struct pci_device_id nvme_id_table
[] = {
2096 { PCI_VDEVICE(INTEL
, 0x0953),
2097 .driver_data
= NVME_QUIRK_STRIPE_SIZE
|
2098 NVME_QUIRK_DISCARD_ZEROES
, },
2099 { PCI_VDEVICE(INTEL
, 0x0a53),
2100 .driver_data
= NVME_QUIRK_STRIPE_SIZE
|
2101 NVME_QUIRK_DISCARD_ZEROES
, },
2102 { PCI_VDEVICE(INTEL
, 0x0a54),
2103 .driver_data
= NVME_QUIRK_STRIPE_SIZE
|
2104 NVME_QUIRK_DISCARD_ZEROES
, },
2105 { PCI_VDEVICE(INTEL
, 0x5845), /* Qemu emulated controller */
2106 .driver_data
= NVME_QUIRK_IDENTIFY_CNS
, },
2107 { PCI_DEVICE(0x1c58, 0x0003), /* HGST adapter */
2108 .driver_data
= NVME_QUIRK_DELAY_BEFORE_CHK_RDY
, },
2109 { PCI_DEVICE(0x1c5f, 0x0540), /* Memblaze Pblaze4 adapter */
2110 .driver_data
= NVME_QUIRK_DELAY_BEFORE_CHK_RDY
, },
2111 { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS
, 0xffffff) },
2112 { PCI_DEVICE(PCI_VENDOR_ID_APPLE
, 0x2001) },
2115 MODULE_DEVICE_TABLE(pci
, nvme_id_table
);
2117 static struct pci_driver nvme_driver
= {
2119 .id_table
= nvme_id_table
,
2120 .probe
= nvme_probe
,
2121 .remove
= nvme_remove
,
2122 .shutdown
= nvme_shutdown
,
2124 .pm
= &nvme_dev_pm_ops
,
2126 .sriov_configure
= nvme_pci_sriov_configure
,
2127 .err_handler
= &nvme_err_handler
,
2130 static int __init
nvme_init(void)
2134 nvme_workq
= alloc_workqueue("nvme", WQ_UNBOUND
| WQ_MEM_RECLAIM
, 0);
2138 result
= pci_register_driver(&nvme_driver
);
2140 destroy_workqueue(nvme_workq
);
2144 static void __exit
nvme_exit(void)
2146 pci_unregister_driver(&nvme_driver
);
2147 destroy_workqueue(nvme_workq
);
2151 MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>");
2152 MODULE_LICENSE("GPL");
2153 MODULE_VERSION("1.0");
2154 module_init(nvme_init
);
2155 module_exit(nvme_exit
);