2 * NVM Express device driver
3 * Copyright (c) 2011, 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
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
19 #include <linux/nvme.h>
20 #include <linux/bio.h>
21 #include <linux/bitops.h>
22 #include <linux/blkdev.h>
23 #include <linux/delay.h>
24 #include <linux/errno.h>
26 #include <linux/genhd.h>
27 #include <linux/idr.h>
28 #include <linux/init.h>
29 #include <linux/interrupt.h>
31 #include <linux/kdev_t.h>
32 #include <linux/kthread.h>
33 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/moduleparam.h>
37 #include <linux/pci.h>
38 #include <linux/poison.h>
39 #include <linux/sched.h>
40 #include <linux/slab.h>
41 #include <linux/types.h>
42 #include <linux/version.h>
44 #define NVME_Q_DEPTH 1024
45 #define SQ_SIZE(depth) (depth * sizeof(struct nvme_command))
46 #define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion))
47 #define NVME_MINORS 64
48 #define IO_TIMEOUT (5 * HZ)
49 #define ADMIN_TIMEOUT (60 * HZ)
51 static int nvme_major
;
52 module_param(nvme_major
, int, 0);
54 static int use_threaded_interrupts
;
55 module_param(use_threaded_interrupts
, int, 0);
57 static DEFINE_SPINLOCK(dev_list_lock
);
58 static LIST_HEAD(dev_list
);
59 static struct task_struct
*nvme_thread
;
62 * Represents an NVM Express device. Each nvme_dev is a PCI function.
65 struct list_head node
;
66 struct nvme_queue
**queues
;
68 struct pci_dev
*pci_dev
;
69 struct dma_pool
*prp_page_pool
;
70 struct dma_pool
*prp_small_pool
;
74 struct msix_entry
*entry
;
75 struct nvme_bar __iomem
*bar
;
76 struct list_head namespaces
;
83 * An NVM Express namespace is equivalent to a SCSI LUN
86 struct list_head list
;
89 struct request_queue
*queue
;
97 * An NVM Express queue. Each device has at least two (one for admin
98 * commands and one for I/O commands).
101 struct device
*q_dmadev
;
102 struct nvme_dev
*dev
;
104 struct nvme_command
*sq_cmds
;
105 volatile struct nvme_completion
*cqes
;
106 dma_addr_t sq_dma_addr
;
107 dma_addr_t cq_dma_addr
;
108 wait_queue_head_t sq_full
;
109 wait_queue_t sq_cong_wait
;
110 struct bio_list sq_cong
;
118 unsigned long cmdid_data
[];
122 * Check we didin't inadvertently grow the command struct
124 static inline void _nvme_check_size(void)
126 BUILD_BUG_ON(sizeof(struct nvme_rw_command
) != 64);
127 BUILD_BUG_ON(sizeof(struct nvme_create_cq
) != 64);
128 BUILD_BUG_ON(sizeof(struct nvme_create_sq
) != 64);
129 BUILD_BUG_ON(sizeof(struct nvme_delete_queue
) != 64);
130 BUILD_BUG_ON(sizeof(struct nvme_features
) != 64);
131 BUILD_BUG_ON(sizeof(struct nvme_command
) != 64);
132 BUILD_BUG_ON(sizeof(struct nvme_id_ctrl
) != 4096);
133 BUILD_BUG_ON(sizeof(struct nvme_id_ns
) != 4096);
134 BUILD_BUG_ON(sizeof(struct nvme_lba_range_type
) != 64);
137 struct nvme_cmd_info
{
139 unsigned long timeout
;
142 static struct nvme_cmd_info
*nvme_cmd_info(struct nvme_queue
*nvmeq
)
144 return (void *)&nvmeq
->cmdid_data
[BITS_TO_LONGS(nvmeq
->q_depth
)];
148 * alloc_cmdid() - Allocate a Command ID
149 * @nvmeq: The queue that will be used for this command
150 * @ctx: A pointer that will be passed to the handler
151 * @handler: The ID of the handler to call
153 * Allocate a Command ID for a queue. The data passed in will
154 * be passed to the completion handler. This is implemented by using
155 * the bottom two bits of the ctx pointer to store the handler ID.
156 * Passing in a pointer that's not 4-byte aligned will cause a BUG.
157 * We can change this if it becomes a problem.
159 * May be called with local interrupts disabled and the q_lock held,
160 * or with interrupts enabled and no locks held.
162 static int alloc_cmdid(struct nvme_queue
*nvmeq
, void *ctx
, int handler
,
165 int depth
= nvmeq
->q_depth
- 1;
166 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
169 BUG_ON((unsigned long)ctx
& 3);
172 cmdid
= find_first_zero_bit(nvmeq
->cmdid_data
, depth
);
175 } while (test_and_set_bit(cmdid
, nvmeq
->cmdid_data
));
177 info
[cmdid
].ctx
= (unsigned long)ctx
| handler
;
178 info
[cmdid
].timeout
= jiffies
+ timeout
;
182 static int alloc_cmdid_killable(struct nvme_queue
*nvmeq
, void *ctx
,
183 int handler
, unsigned timeout
)
186 wait_event_killable(nvmeq
->sq_full
,
187 (cmdid
= alloc_cmdid(nvmeq
, ctx
, handler
, timeout
)) >= 0);
188 return (cmdid
< 0) ? -EINTR
: cmdid
;
192 * If you need more than four handlers, you'll need to change how
193 * alloc_cmdid and nvme_process_cq work. Consider using a special
194 * CMD_CTX value instead, if that works for your situation.
197 sync_completion_id
= 0,
201 /* Special values must be a multiple of 4, and less than 0x1000 */
202 #define CMD_CTX_BASE (POISON_POINTER_DELTA + sync_completion_id)
203 #define CMD_CTX_CANCELLED (0x30C + CMD_CTX_BASE)
204 #define CMD_CTX_COMPLETED (0x310 + CMD_CTX_BASE)
205 #define CMD_CTX_INVALID (0x314 + CMD_CTX_BASE)
206 #define CMD_CTX_FLUSH (0x318 + CMD_CTX_BASE)
209 * Called with local interrupts disabled and the q_lock held. May not sleep.
211 static unsigned long free_cmdid(struct nvme_queue
*nvmeq
, int cmdid
)
214 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
216 if (cmdid
>= nvmeq
->q_depth
)
217 return CMD_CTX_INVALID
;
218 data
= info
[cmdid
].ctx
;
219 info
[cmdid
].ctx
= CMD_CTX_COMPLETED
;
220 clear_bit(cmdid
, nvmeq
->cmdid_data
);
221 wake_up(&nvmeq
->sq_full
);
225 static unsigned long cancel_cmdid(struct nvme_queue
*nvmeq
, int cmdid
)
228 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
229 data
= info
[cmdid
].ctx
;
230 info
[cmdid
].ctx
= CMD_CTX_CANCELLED
;
234 static struct nvme_queue
*get_nvmeq(struct nvme_ns
*ns
)
236 return ns
->dev
->queues
[get_cpu() + 1];
239 static void put_nvmeq(struct nvme_queue
*nvmeq
)
245 * nvme_submit_cmd() - Copy a command into a queue and ring the doorbell
246 * @nvmeq: The queue to use
247 * @cmd: The command to send
249 * Safe to use from interrupt context
251 static int nvme_submit_cmd(struct nvme_queue
*nvmeq
, struct nvme_command
*cmd
)
255 spin_lock_irqsave(&nvmeq
->q_lock
, flags
);
256 tail
= nvmeq
->sq_tail
;
257 memcpy(&nvmeq
->sq_cmds
[tail
], cmd
, sizeof(*cmd
));
258 if (++tail
== nvmeq
->q_depth
)
260 writel(tail
, nvmeq
->q_db
);
261 nvmeq
->sq_tail
= tail
;
262 spin_unlock_irqrestore(&nvmeq
->q_lock
, flags
);
269 dma_addr_t first_dma
;
273 static void nvme_free_prps(struct nvme_dev
*dev
, struct nvme_prps
*prps
)
275 const int last_prp
= PAGE_SIZE
/ 8 - 1;
282 prp_dma
= prps
->first_dma
;
284 if (prps
->npages
== 0)
285 dma_pool_free(dev
->prp_small_pool
, prps
->list
[0], prp_dma
);
286 for (i
= 0; i
< prps
->npages
; i
++) {
287 __le64
*prp_list
= prps
->list
[i
];
288 dma_addr_t next_prp_dma
= le64_to_cpu(prp_list
[last_prp
]);
289 dma_pool_free(dev
->prp_page_pool
, prp_list
, prp_dma
);
290 prp_dma
= next_prp_dma
;
298 struct nvme_prps
*prps
;
299 struct scatterlist sg
[0];
302 /* XXX: use a mempool */
303 static struct nvme_bio
*alloc_nbio(unsigned nseg
, gfp_t gfp
)
305 return kzalloc(sizeof(struct nvme_bio
) +
306 sizeof(struct scatterlist
) * nseg
, gfp
);
309 static void free_nbio(struct nvme_queue
*nvmeq
, struct nvme_bio
*nbio
)
311 nvme_free_prps(nvmeq
->dev
, nbio
->prps
);
315 static void bio_completion(struct nvme_queue
*nvmeq
, void *ctx
,
316 struct nvme_completion
*cqe
)
318 struct nvme_bio
*nbio
= ctx
;
319 struct bio
*bio
= nbio
->bio
;
320 u16 status
= le16_to_cpup(&cqe
->status
) >> 1;
322 dma_unmap_sg(nvmeq
->q_dmadev
, nbio
->sg
, nbio
->nents
,
323 bio_data_dir(bio
) ? DMA_TO_DEVICE
: DMA_FROM_DEVICE
);
324 free_nbio(nvmeq
, nbio
);
326 bio_endio(bio
, -EIO
);
327 } else if (bio
->bi_vcnt
> bio
->bi_idx
) {
328 if (bio_list_empty(&nvmeq
->sq_cong
))
329 add_wait_queue(&nvmeq
->sq_full
, &nvmeq
->sq_cong_wait
);
330 bio_list_add(&nvmeq
->sq_cong
, bio
);
331 wake_up_process(nvme_thread
);
337 /* length is in bytes. gfp flags indicates whether we may sleep. */
338 static struct nvme_prps
*nvme_setup_prps(struct nvme_dev
*dev
,
339 struct nvme_common_command
*cmd
,
340 struct scatterlist
*sg
, int *len
,
343 struct dma_pool
*pool
;
345 int dma_len
= sg_dma_len(sg
);
346 u64 dma_addr
= sg_dma_address(sg
);
347 int offset
= offset_in_page(dma_addr
);
350 int nprps
, npages
, i
, prp_page
;
351 struct nvme_prps
*prps
= NULL
;
353 cmd
->prp1
= cpu_to_le64(dma_addr
);
354 length
-= (PAGE_SIZE
- offset
);
358 dma_len
-= (PAGE_SIZE
- offset
);
360 dma_addr
+= (PAGE_SIZE
- offset
);
363 dma_addr
= sg_dma_address(sg
);
364 dma_len
= sg_dma_len(sg
);
367 if (length
<= PAGE_SIZE
) {
368 cmd
->prp2
= cpu_to_le64(dma_addr
);
372 nprps
= DIV_ROUND_UP(length
, PAGE_SIZE
);
373 npages
= DIV_ROUND_UP(8 * nprps
, PAGE_SIZE
);
374 prps
= kmalloc(sizeof(*prps
) + sizeof(__le64
*) * npages
, gfp
);
376 cmd
->prp2
= cpu_to_le64(dma_addr
);
377 *len
= (*len
- length
) + PAGE_SIZE
;
381 if (nprps
<= (256 / 8)) {
382 pool
= dev
->prp_small_pool
;
385 pool
= dev
->prp_page_pool
;
386 prps
->npages
= npages
;
389 prp_list
= dma_pool_alloc(pool
, gfp
, &prp_dma
);
391 cmd
->prp2
= cpu_to_le64(dma_addr
);
392 *len
= (*len
- length
) + PAGE_SIZE
;
396 prps
->list
[prp_page
++] = prp_list
;
397 prps
->first_dma
= prp_dma
;
398 cmd
->prp2
= cpu_to_le64(prp_dma
);
401 if (i
== PAGE_SIZE
/ 8) {
402 __le64
*old_prp_list
= prp_list
;
403 prp_list
= dma_pool_alloc(pool
, gfp
, &prp_dma
);
405 *len
= (*len
- length
);
408 prps
->list
[prp_page
++] = prp_list
;
409 prp_list
[0] = old_prp_list
[i
- 1];
410 old_prp_list
[i
- 1] = cpu_to_le64(prp_dma
);
413 prp_list
[i
++] = cpu_to_le64(dma_addr
);
414 dma_len
-= PAGE_SIZE
;
415 dma_addr
+= PAGE_SIZE
;
423 dma_addr
= sg_dma_address(sg
);
424 dma_len
= sg_dma_len(sg
);
430 /* NVMe scatterlists require no holes in the virtual address */
431 #define BIOVEC_NOT_VIRT_MERGEABLE(vec1, vec2) ((vec2)->bv_offset || \
432 (((vec1)->bv_offset + (vec1)->bv_len) % PAGE_SIZE))
434 static int nvme_map_bio(struct device
*dev
, struct nvme_bio
*nbio
,
435 struct bio
*bio
, enum dma_data_direction dma_dir
, int psegs
)
437 struct bio_vec
*bvec
, *bvprv
= NULL
;
438 struct scatterlist
*sg
= NULL
;
439 int i
, old_idx
, length
= 0, nsegs
= 0;
441 sg_init_table(nbio
->sg
, psegs
);
442 old_idx
= bio
->bi_idx
;
443 bio_for_each_segment(bvec
, bio
, i
) {
444 if (bvprv
&& BIOVEC_PHYS_MERGEABLE(bvprv
, bvec
)) {
445 sg
->length
+= bvec
->bv_len
;
447 if (bvprv
&& BIOVEC_NOT_VIRT_MERGEABLE(bvprv
, bvec
))
449 sg
= sg
? sg
+ 1 : nbio
->sg
;
450 sg_set_page(sg
, bvec
->bv_page
, bvec
->bv_len
,
454 length
+= bvec
->bv_len
;
460 if (dma_map_sg(dev
, nbio
->sg
, nbio
->nents
, dma_dir
) == 0) {
461 bio
->bi_idx
= old_idx
;
467 static int nvme_submit_flush(struct nvme_queue
*nvmeq
, struct nvme_ns
*ns
,
470 struct nvme_command
*cmnd
= &nvmeq
->sq_cmds
[nvmeq
->sq_tail
];
472 memset(cmnd
, 0, sizeof(*cmnd
));
473 cmnd
->common
.opcode
= nvme_cmd_flush
;
474 cmnd
->common
.command_id
= cmdid
;
475 cmnd
->common
.nsid
= cpu_to_le32(ns
->ns_id
);
477 if (++nvmeq
->sq_tail
== nvmeq
->q_depth
)
479 writel(nvmeq
->sq_tail
, nvmeq
->q_db
);
484 static int nvme_submit_flush_data(struct nvme_queue
*nvmeq
, struct nvme_ns
*ns
)
486 int cmdid
= alloc_cmdid(nvmeq
, (void *)CMD_CTX_FLUSH
,
487 sync_completion_id
, IO_TIMEOUT
);
488 if (unlikely(cmdid
< 0))
491 return nvme_submit_flush(nvmeq
, ns
, cmdid
);
495 * Called with local interrupts disabled and the q_lock held. May not sleep.
497 static int nvme_submit_bio_queue(struct nvme_queue
*nvmeq
, struct nvme_ns
*ns
,
500 struct nvme_command
*cmnd
;
501 struct nvme_bio
*nbio
;
502 enum dma_data_direction dma_dir
;
503 int cmdid
, length
, result
= -ENOMEM
;
506 int psegs
= bio_phys_segments(ns
->queue
, bio
);
508 if ((bio
->bi_rw
& REQ_FLUSH
) && psegs
) {
509 result
= nvme_submit_flush_data(nvmeq
, ns
);
514 nbio
= alloc_nbio(psegs
, GFP_ATOMIC
);
520 cmdid
= alloc_cmdid(nvmeq
, nbio
, bio_completion_id
, IO_TIMEOUT
);
521 if (unlikely(cmdid
< 0))
524 if ((bio
->bi_rw
& REQ_FLUSH
) && !psegs
)
525 return nvme_submit_flush(nvmeq
, ns
, cmdid
);
528 if (bio
->bi_rw
& REQ_FUA
)
529 control
|= NVME_RW_FUA
;
530 if (bio
->bi_rw
& (REQ_FAILFAST_DEV
| REQ_RAHEAD
))
531 control
|= NVME_RW_LR
;
534 if (bio
->bi_rw
& REQ_RAHEAD
)
535 dsmgmt
|= NVME_RW_DSM_FREQ_PREFETCH
;
537 cmnd
= &nvmeq
->sq_cmds
[nvmeq
->sq_tail
];
539 memset(cmnd
, 0, sizeof(*cmnd
));
540 if (bio_data_dir(bio
)) {
541 cmnd
->rw
.opcode
= nvme_cmd_write
;
542 dma_dir
= DMA_TO_DEVICE
;
544 cmnd
->rw
.opcode
= nvme_cmd_read
;
545 dma_dir
= DMA_FROM_DEVICE
;
548 result
= nvme_map_bio(nvmeq
->q_dmadev
, nbio
, bio
, dma_dir
, psegs
);
553 cmnd
->rw
.command_id
= cmdid
;
554 cmnd
->rw
.nsid
= cpu_to_le32(ns
->ns_id
);
555 nbio
->prps
= nvme_setup_prps(nvmeq
->dev
, &cmnd
->common
, nbio
->sg
,
556 &length
, GFP_ATOMIC
);
557 cmnd
->rw
.slba
= cpu_to_le64(bio
->bi_sector
>> (ns
->lba_shift
- 9));
558 cmnd
->rw
.length
= cpu_to_le16((length
>> ns
->lba_shift
) - 1);
559 cmnd
->rw
.control
= cpu_to_le16(control
);
560 cmnd
->rw
.dsmgmt
= cpu_to_le32(dsmgmt
);
562 bio
->bi_sector
+= length
>> 9;
564 if (++nvmeq
->sq_tail
== nvmeq
->q_depth
)
566 writel(nvmeq
->sq_tail
, nvmeq
->q_db
);
571 free_nbio(nvmeq
, nbio
);
577 * NB: return value of non-zero would mean that we were a stacking driver.
578 * make_request must always succeed.
580 static int nvme_make_request(struct request_queue
*q
, struct bio
*bio
)
582 struct nvme_ns
*ns
= q
->queuedata
;
583 struct nvme_queue
*nvmeq
= get_nvmeq(ns
);
586 spin_lock_irq(&nvmeq
->q_lock
);
587 if (bio_list_empty(&nvmeq
->sq_cong
))
588 result
= nvme_submit_bio_queue(nvmeq
, ns
, bio
);
589 if (unlikely(result
)) {
590 if (bio_list_empty(&nvmeq
->sq_cong
))
591 add_wait_queue(&nvmeq
->sq_full
, &nvmeq
->sq_cong_wait
);
592 bio_list_add(&nvmeq
->sq_cong
, bio
);
595 spin_unlock_irq(&nvmeq
->q_lock
);
601 struct sync_cmd_info
{
602 struct task_struct
*task
;
607 static void sync_completion(struct nvme_queue
*nvmeq
, void *ctx
,
608 struct nvme_completion
*cqe
)
610 struct sync_cmd_info
*cmdinfo
= ctx
;
611 if (unlikely((unsigned long)cmdinfo
== CMD_CTX_CANCELLED
))
613 if ((unsigned long)cmdinfo
== CMD_CTX_FLUSH
)
615 if (unlikely((unsigned long)cmdinfo
== CMD_CTX_COMPLETED
)) {
616 dev_warn(nvmeq
->q_dmadev
,
617 "completed id %d twice on queue %d\n",
618 cqe
->command_id
, le16_to_cpup(&cqe
->sq_id
));
621 if (unlikely((unsigned long)cmdinfo
== CMD_CTX_INVALID
)) {
622 dev_warn(nvmeq
->q_dmadev
,
623 "invalid id %d completed on queue %d\n",
624 cqe
->command_id
, le16_to_cpup(&cqe
->sq_id
));
627 cmdinfo
->result
= le32_to_cpup(&cqe
->result
);
628 cmdinfo
->status
= le16_to_cpup(&cqe
->status
) >> 1;
629 wake_up_process(cmdinfo
->task
);
632 typedef void (*completion_fn
)(struct nvme_queue
*, void *,
633 struct nvme_completion
*);
635 static const completion_fn nvme_completions
[4] = {
636 [sync_completion_id
] = sync_completion
,
637 [bio_completion_id
] = bio_completion
,
640 static irqreturn_t
nvme_process_cq(struct nvme_queue
*nvmeq
)
644 head
= nvmeq
->cq_head
;
645 phase
= nvmeq
->cq_phase
;
650 unsigned char handler
;
651 struct nvme_completion cqe
= nvmeq
->cqes
[head
];
652 if ((le16_to_cpu(cqe
.status
) & 1) != phase
)
654 nvmeq
->sq_head
= le16_to_cpu(cqe
.sq_head
);
655 if (++head
== nvmeq
->q_depth
) {
660 data
= free_cmdid(nvmeq
, cqe
.command_id
);
662 ptr
= (void *)(data
& ~3UL);
663 nvme_completions
[handler
](nvmeq
, ptr
, &cqe
);
666 /* If the controller ignores the cq head doorbell and continuously
667 * writes to the queue, it is theoretically possible to wrap around
668 * the queue twice and mistakenly return IRQ_NONE. Linux only
669 * requires that 0.1% of your interrupts are handled, so this isn't
672 if (head
== nvmeq
->cq_head
&& phase
== nvmeq
->cq_phase
)
675 writel(head
, nvmeq
->q_db
+ 1);
676 nvmeq
->cq_head
= head
;
677 nvmeq
->cq_phase
= phase
;
682 static irqreturn_t
nvme_irq(int irq
, void *data
)
685 struct nvme_queue
*nvmeq
= data
;
686 spin_lock(&nvmeq
->q_lock
);
687 result
= nvme_process_cq(nvmeq
);
688 spin_unlock(&nvmeq
->q_lock
);
692 static irqreturn_t
nvme_irq_check(int irq
, void *data
)
694 struct nvme_queue
*nvmeq
= data
;
695 struct nvme_completion cqe
= nvmeq
->cqes
[nvmeq
->cq_head
];
696 if ((le16_to_cpu(cqe
.status
) & 1) != nvmeq
->cq_phase
)
698 return IRQ_WAKE_THREAD
;
701 static void nvme_abort_command(struct nvme_queue
*nvmeq
, int cmdid
)
703 spin_lock_irq(&nvmeq
->q_lock
);
704 cancel_cmdid(nvmeq
, cmdid
);
705 spin_unlock_irq(&nvmeq
->q_lock
);
709 * Returns 0 on success. If the result is negative, it's a Linux error code;
710 * if the result is positive, it's an NVM Express status code
712 static int nvme_submit_sync_cmd(struct nvme_queue
*nvmeq
,
713 struct nvme_command
*cmd
, u32
*result
, unsigned timeout
)
716 struct sync_cmd_info cmdinfo
;
718 cmdinfo
.task
= current
;
719 cmdinfo
.status
= -EINTR
;
721 cmdid
= alloc_cmdid_killable(nvmeq
, &cmdinfo
, sync_completion_id
,
725 cmd
->common
.command_id
= cmdid
;
727 set_current_state(TASK_KILLABLE
);
728 nvme_submit_cmd(nvmeq
, cmd
);
731 if (cmdinfo
.status
== -EINTR
) {
732 nvme_abort_command(nvmeq
, cmdid
);
737 *result
= cmdinfo
.result
;
739 return cmdinfo
.status
;
742 static int nvme_submit_admin_cmd(struct nvme_dev
*dev
, struct nvme_command
*cmd
,
745 return nvme_submit_sync_cmd(dev
->queues
[0], cmd
, result
, ADMIN_TIMEOUT
);
748 static int adapter_delete_queue(struct nvme_dev
*dev
, u8 opcode
, u16 id
)
751 struct nvme_command c
;
753 memset(&c
, 0, sizeof(c
));
754 c
.delete_queue
.opcode
= opcode
;
755 c
.delete_queue
.qid
= cpu_to_le16(id
);
757 status
= nvme_submit_admin_cmd(dev
, &c
, NULL
);
763 static int adapter_alloc_cq(struct nvme_dev
*dev
, u16 qid
,
764 struct nvme_queue
*nvmeq
)
767 struct nvme_command c
;
768 int flags
= NVME_QUEUE_PHYS_CONTIG
| NVME_CQ_IRQ_ENABLED
;
770 memset(&c
, 0, sizeof(c
));
771 c
.create_cq
.opcode
= nvme_admin_create_cq
;
772 c
.create_cq
.prp1
= cpu_to_le64(nvmeq
->cq_dma_addr
);
773 c
.create_cq
.cqid
= cpu_to_le16(qid
);
774 c
.create_cq
.qsize
= cpu_to_le16(nvmeq
->q_depth
- 1);
775 c
.create_cq
.cq_flags
= cpu_to_le16(flags
);
776 c
.create_cq
.irq_vector
= cpu_to_le16(nvmeq
->cq_vector
);
778 status
= nvme_submit_admin_cmd(dev
, &c
, NULL
);
784 static int adapter_alloc_sq(struct nvme_dev
*dev
, u16 qid
,
785 struct nvme_queue
*nvmeq
)
788 struct nvme_command c
;
789 int flags
= NVME_QUEUE_PHYS_CONTIG
| NVME_SQ_PRIO_MEDIUM
;
791 memset(&c
, 0, sizeof(c
));
792 c
.create_sq
.opcode
= nvme_admin_create_sq
;
793 c
.create_sq
.prp1
= cpu_to_le64(nvmeq
->sq_dma_addr
);
794 c
.create_sq
.sqid
= cpu_to_le16(qid
);
795 c
.create_sq
.qsize
= cpu_to_le16(nvmeq
->q_depth
- 1);
796 c
.create_sq
.sq_flags
= cpu_to_le16(flags
);
797 c
.create_sq
.cqid
= cpu_to_le16(qid
);
799 status
= nvme_submit_admin_cmd(dev
, &c
, NULL
);
805 static int adapter_delete_cq(struct nvme_dev
*dev
, u16 cqid
)
807 return adapter_delete_queue(dev
, nvme_admin_delete_cq
, cqid
);
810 static int adapter_delete_sq(struct nvme_dev
*dev
, u16 sqid
)
812 return adapter_delete_queue(dev
, nvme_admin_delete_sq
, sqid
);
815 static void nvme_free_queue(struct nvme_dev
*dev
, int qid
)
817 struct nvme_queue
*nvmeq
= dev
->queues
[qid
];
818 int vector
= dev
->entry
[nvmeq
->cq_vector
].vector
;
820 irq_set_affinity_hint(vector
, NULL
);
821 free_irq(vector
, nvmeq
);
823 /* Don't tell the adapter to delete the admin queue */
825 adapter_delete_sq(dev
, qid
);
826 adapter_delete_cq(dev
, qid
);
829 dma_free_coherent(nvmeq
->q_dmadev
, CQ_SIZE(nvmeq
->q_depth
),
830 (void *)nvmeq
->cqes
, nvmeq
->cq_dma_addr
);
831 dma_free_coherent(nvmeq
->q_dmadev
, SQ_SIZE(nvmeq
->q_depth
),
832 nvmeq
->sq_cmds
, nvmeq
->sq_dma_addr
);
836 static struct nvme_queue
*nvme_alloc_queue(struct nvme_dev
*dev
, int qid
,
837 int depth
, int vector
)
839 struct device
*dmadev
= &dev
->pci_dev
->dev
;
840 unsigned extra
= (depth
/ 8) + (depth
* sizeof(struct nvme_cmd_info
));
841 struct nvme_queue
*nvmeq
= kzalloc(sizeof(*nvmeq
) + extra
, GFP_KERNEL
);
845 nvmeq
->cqes
= dma_alloc_coherent(dmadev
, CQ_SIZE(depth
),
846 &nvmeq
->cq_dma_addr
, GFP_KERNEL
);
849 memset((void *)nvmeq
->cqes
, 0, CQ_SIZE(depth
));
851 nvmeq
->sq_cmds
= dma_alloc_coherent(dmadev
, SQ_SIZE(depth
),
852 &nvmeq
->sq_dma_addr
, GFP_KERNEL
);
856 nvmeq
->q_dmadev
= dmadev
;
858 spin_lock_init(&nvmeq
->q_lock
);
861 init_waitqueue_head(&nvmeq
->sq_full
);
862 init_waitqueue_entry(&nvmeq
->sq_cong_wait
, nvme_thread
);
863 bio_list_init(&nvmeq
->sq_cong
);
864 nvmeq
->q_db
= &dev
->dbs
[qid
* 2];
865 nvmeq
->q_depth
= depth
;
866 nvmeq
->cq_vector
= vector
;
871 dma_free_coherent(dmadev
, CQ_SIZE(nvmeq
->q_depth
), (void *)nvmeq
->cqes
,
878 static int queue_request_irq(struct nvme_dev
*dev
, struct nvme_queue
*nvmeq
,
881 if (use_threaded_interrupts
)
882 return request_threaded_irq(dev
->entry
[nvmeq
->cq_vector
].vector
,
883 nvme_irq_check
, nvme_irq
,
884 IRQF_DISABLED
| IRQF_SHARED
,
886 return request_irq(dev
->entry
[nvmeq
->cq_vector
].vector
, nvme_irq
,
887 IRQF_DISABLED
| IRQF_SHARED
, name
, nvmeq
);
890 static __devinit
struct nvme_queue
*nvme_create_queue(struct nvme_dev
*dev
,
891 int qid
, int cq_size
, int vector
)
894 struct nvme_queue
*nvmeq
= nvme_alloc_queue(dev
, qid
, cq_size
, vector
);
897 return ERR_PTR(-ENOMEM
);
899 result
= adapter_alloc_cq(dev
, qid
, nvmeq
);
903 result
= adapter_alloc_sq(dev
, qid
, nvmeq
);
907 result
= queue_request_irq(dev
, nvmeq
, "nvme");
914 adapter_delete_sq(dev
, qid
);
916 adapter_delete_cq(dev
, qid
);
918 dma_free_coherent(nvmeq
->q_dmadev
, CQ_SIZE(nvmeq
->q_depth
),
919 (void *)nvmeq
->cqes
, nvmeq
->cq_dma_addr
);
920 dma_free_coherent(nvmeq
->q_dmadev
, SQ_SIZE(nvmeq
->q_depth
),
921 nvmeq
->sq_cmds
, nvmeq
->sq_dma_addr
);
923 return ERR_PTR(result
);
926 static int __devinit
nvme_configure_admin_queue(struct nvme_dev
*dev
)
931 unsigned long timeout
;
932 struct nvme_queue
*nvmeq
;
934 dev
->dbs
= ((void __iomem
*)dev
->bar
) + 4096;
936 nvmeq
= nvme_alloc_queue(dev
, 0, 64, 0);
940 aqa
= nvmeq
->q_depth
- 1;
943 dev
->ctrl_config
= NVME_CC_ENABLE
| NVME_CC_CSS_NVM
;
944 dev
->ctrl_config
|= (PAGE_SHIFT
- 12) << NVME_CC_MPS_SHIFT
;
945 dev
->ctrl_config
|= NVME_CC_ARB_RR
| NVME_CC_SHN_NONE
;
946 dev
->ctrl_config
|= NVME_CC_IOSQES
| NVME_CC_IOCQES
;
948 writel(0, &dev
->bar
->cc
);
949 writel(aqa
, &dev
->bar
->aqa
);
950 writeq(nvmeq
->sq_dma_addr
, &dev
->bar
->asq
);
951 writeq(nvmeq
->cq_dma_addr
, &dev
->bar
->acq
);
952 writel(dev
->ctrl_config
, &dev
->bar
->cc
);
954 cap
= readq(&dev
->bar
->cap
);
955 timeout
= ((NVME_CAP_TIMEOUT(cap
) + 1) * HZ
/ 2) + jiffies
;
957 while (!(readl(&dev
->bar
->csts
) & NVME_CSTS_RDY
)) {
959 if (fatal_signal_pending(current
))
961 if (time_after(jiffies
, timeout
)) {
962 dev_err(&dev
->pci_dev
->dev
,
963 "Device not ready; aborting initialisation\n");
968 result
= queue_request_irq(dev
, nvmeq
, "nvme admin");
969 dev
->queues
[0] = nvmeq
;
973 static int nvme_map_user_pages(struct nvme_dev
*dev
, int write
,
974 unsigned long addr
, unsigned length
,
975 struct scatterlist
**sgp
)
977 int i
, err
, count
, nents
, offset
;
978 struct scatterlist
*sg
;
986 offset
= offset_in_page(addr
);
987 count
= DIV_ROUND_UP(offset
+ length
, PAGE_SIZE
);
988 pages
= kcalloc(count
, sizeof(*pages
), GFP_KERNEL
);
990 err
= get_user_pages_fast(addr
, count
, 1, pages
);
997 sg
= kcalloc(count
, sizeof(*sg
), GFP_KERNEL
);
998 sg_init_table(sg
, count
);
999 sg_set_page(&sg
[0], pages
[0], PAGE_SIZE
- offset
, offset
);
1000 length
-= (PAGE_SIZE
- offset
);
1001 for (i
= 1; i
< count
; i
++) {
1002 sg_set_page(&sg
[i
], pages
[i
], min_t(int, length
, PAGE_SIZE
), 0);
1003 length
-= PAGE_SIZE
;
1007 nents
= dma_map_sg(&dev
->pci_dev
->dev
, sg
, count
,
1008 write
? DMA_TO_DEVICE
: DMA_FROM_DEVICE
);
1017 for (i
= 0; i
< count
; i
++)
1023 static void nvme_unmap_user_pages(struct nvme_dev
*dev
, int write
,
1024 unsigned long addr
, int length
,
1025 struct scatterlist
*sg
, int nents
)
1029 count
= DIV_ROUND_UP(offset_in_page(addr
) + length
, PAGE_SIZE
);
1030 dma_unmap_sg(&dev
->pci_dev
->dev
, sg
, nents
, DMA_FROM_DEVICE
);
1032 for (i
= 0; i
< count
; i
++)
1033 put_page(sg_page(&sg
[i
]));
1036 static int nvme_submit_io(struct nvme_ns
*ns
, struct nvme_user_io __user
*uio
)
1038 struct nvme_dev
*dev
= ns
->dev
;
1039 struct nvme_queue
*nvmeq
;
1040 struct nvme_user_io io
;
1041 struct nvme_command c
;
1044 struct scatterlist
*sg
;
1045 struct nvme_prps
*prps
;
1047 if (copy_from_user(&io
, uio
, sizeof(io
)))
1049 length
= (io
.nblocks
+ 1) << ns
->lba_shift
;
1051 switch (io
.opcode
) {
1052 case nvme_cmd_write
:
1054 case nvme_cmd_compare
:
1055 nents
= nvme_map_user_pages(dev
, io
.opcode
& 1, io
.addr
,
1064 memset(&c
, 0, sizeof(c
));
1065 c
.rw
.opcode
= io
.opcode
;
1066 c
.rw
.flags
= io
.flags
;
1067 c
.rw
.nsid
= cpu_to_le32(ns
->ns_id
);
1068 c
.rw
.slba
= cpu_to_le64(io
.slba
);
1069 c
.rw
.length
= cpu_to_le16(io
.nblocks
);
1070 c
.rw
.control
= cpu_to_le16(io
.control
);
1071 c
.rw
.dsmgmt
= cpu_to_le16(io
.dsmgmt
);
1072 c
.rw
.reftag
= io
.reftag
;
1073 c
.rw
.apptag
= io
.apptag
;
1074 c
.rw
.appmask
= io
.appmask
;
1076 prps
= nvme_setup_prps(dev
, &c
.common
, sg
, &length
, GFP_KERNEL
);
1078 nvmeq
= get_nvmeq(ns
);
1080 * Since nvme_submit_sync_cmd sleeps, we can't keep preemption
1081 * disabled. We may be preempted at any point, and be rescheduled
1082 * to a different CPU. That will cause cacheline bouncing, but no
1083 * additional races since q_lock already protects against other CPUs.
1086 if (length
!= (io
.nblocks
+ 1) << ns
->lba_shift
)
1089 status
= nvme_submit_sync_cmd(nvmeq
, &c
, NULL
, IO_TIMEOUT
);
1091 nvme_unmap_user_pages(dev
, io
.opcode
& 1, io
.addr
, length
, sg
, nents
);
1092 nvme_free_prps(dev
, prps
);
1096 static int nvme_user_admin_cmd(struct nvme_ns
*ns
,
1097 struct nvme_admin_cmd __user
*ucmd
)
1099 struct nvme_dev
*dev
= ns
->dev
;
1100 struct nvme_admin_cmd cmd
;
1101 struct nvme_command c
;
1102 int status
, length
, nents
= 0;
1103 struct scatterlist
*sg
;
1104 struct nvme_prps
*prps
= NULL
;
1106 if (!capable(CAP_SYS_ADMIN
))
1108 if (copy_from_user(&cmd
, ucmd
, sizeof(cmd
)))
1111 memset(&c
, 0, sizeof(c
));
1112 c
.common
.opcode
= cmd
.opcode
;
1113 c
.common
.flags
= cmd
.flags
;
1114 c
.common
.nsid
= cpu_to_le32(cmd
.nsid
);
1115 c
.common
.cdw2
[0] = cpu_to_le32(cmd
.cdw2
);
1116 c
.common
.cdw2
[1] = cpu_to_le32(cmd
.cdw3
);
1117 c
.common
.cdw10
[0] = cpu_to_le32(cmd
.cdw10
);
1118 c
.common
.cdw10
[1] = cpu_to_le32(cmd
.cdw11
);
1119 c
.common
.cdw10
[2] = cpu_to_le32(cmd
.cdw12
);
1120 c
.common
.cdw10
[3] = cpu_to_le32(cmd
.cdw13
);
1121 c
.common
.cdw10
[4] = cpu_to_le32(cmd
.cdw14
);
1122 c
.common
.cdw10
[5] = cpu_to_le32(cmd
.cdw15
);
1124 length
= cmd
.data_len
;
1126 nents
= nvme_map_user_pages(dev
, 1, cmd
.addr
, length
, &sg
);
1129 prps
= nvme_setup_prps(dev
, &c
.common
, sg
, &length
, GFP_KERNEL
);
1132 if (length
!= cmd
.data_len
)
1135 status
= nvme_submit_admin_cmd(dev
, &c
, NULL
);
1137 nvme_unmap_user_pages(dev
, 0, cmd
.addr
, cmd
.data_len
, sg
,
1139 nvme_free_prps(dev
, prps
);
1144 static int nvme_ioctl(struct block_device
*bdev
, fmode_t mode
, unsigned int cmd
,
1147 struct nvme_ns
*ns
= bdev
->bd_disk
->private_data
;
1152 case NVME_IOCTL_ADMIN_CMD
:
1153 return nvme_user_admin_cmd(ns
, (void __user
*)arg
);
1154 case NVME_IOCTL_SUBMIT_IO
:
1155 return nvme_submit_io(ns
, (void __user
*)arg
);
1161 static const struct block_device_operations nvme_fops
= {
1162 .owner
= THIS_MODULE
,
1163 .ioctl
= nvme_ioctl
,
1164 .compat_ioctl
= nvme_ioctl
,
1167 static void nvme_timeout_ios(struct nvme_queue
*nvmeq
)
1169 int depth
= nvmeq
->q_depth
- 1;
1170 struct nvme_cmd_info
*info
= nvme_cmd_info(nvmeq
);
1171 unsigned long now
= jiffies
;
1174 for_each_set_bit(cmdid
, nvmeq
->cmdid_data
, depth
) {
1177 unsigned char handler
;
1178 static struct nvme_completion cqe
= { .status
= cpu_to_le16(NVME_SC_ABORT_REQ
) << 1, };
1180 if (!time_after(now
, info
[cmdid
].timeout
))
1182 dev_warn(nvmeq
->q_dmadev
, "Timing out I/O %d\n", cmdid
);
1183 data
= cancel_cmdid(nvmeq
, cmdid
);
1185 ptr
= (void *)(data
& ~3UL);
1186 nvme_completions
[handler
](nvmeq
, ptr
, &cqe
);
1190 static void nvme_resubmit_bios(struct nvme_queue
*nvmeq
)
1192 while (bio_list_peek(&nvmeq
->sq_cong
)) {
1193 struct bio
*bio
= bio_list_pop(&nvmeq
->sq_cong
);
1194 struct nvme_ns
*ns
= bio
->bi_bdev
->bd_disk
->private_data
;
1195 if (nvme_submit_bio_queue(nvmeq
, ns
, bio
)) {
1196 bio_list_add_head(&nvmeq
->sq_cong
, bio
);
1199 if (bio_list_empty(&nvmeq
->sq_cong
))
1200 remove_wait_queue(&nvmeq
->sq_full
,
1201 &nvmeq
->sq_cong_wait
);
1205 static int nvme_kthread(void *data
)
1207 struct nvme_dev
*dev
;
1209 while (!kthread_should_stop()) {
1210 __set_current_state(TASK_RUNNING
);
1211 spin_lock(&dev_list_lock
);
1212 list_for_each_entry(dev
, &dev_list
, node
) {
1214 for (i
= 0; i
< dev
->queue_count
; i
++) {
1215 struct nvme_queue
*nvmeq
= dev
->queues
[i
];
1218 spin_lock_irq(&nvmeq
->q_lock
);
1219 if (nvme_process_cq(nvmeq
))
1220 printk("process_cq did something\n");
1221 nvme_timeout_ios(nvmeq
);
1222 nvme_resubmit_bios(nvmeq
);
1223 spin_unlock_irq(&nvmeq
->q_lock
);
1226 spin_unlock(&dev_list_lock
);
1227 set_current_state(TASK_INTERRUPTIBLE
);
1228 schedule_timeout(HZ
);
1233 static DEFINE_IDA(nvme_index_ida
);
1235 static int nvme_get_ns_idx(void)
1240 if (!ida_pre_get(&nvme_index_ida
, GFP_KERNEL
))
1243 spin_lock(&dev_list_lock
);
1244 error
= ida_get_new(&nvme_index_ida
, &index
);
1245 spin_unlock(&dev_list_lock
);
1246 } while (error
== -EAGAIN
);
1253 static void nvme_put_ns_idx(int index
)
1255 spin_lock(&dev_list_lock
);
1256 ida_remove(&nvme_index_ida
, index
);
1257 spin_unlock(&dev_list_lock
);
1260 static struct nvme_ns
*nvme_alloc_ns(struct nvme_dev
*dev
, int nsid
,
1261 struct nvme_id_ns
*id
, struct nvme_lba_range_type
*rt
)
1264 struct gendisk
*disk
;
1267 if (rt
->attributes
& NVME_LBART_ATTRIB_HIDE
)
1270 ns
= kzalloc(sizeof(*ns
), GFP_KERNEL
);
1273 ns
->queue
= blk_alloc_queue(GFP_KERNEL
);
1276 ns
->queue
->queue_flags
= QUEUE_FLAG_DEFAULT
| QUEUE_FLAG_NOMERGES
|
1277 QUEUE_FLAG_NONROT
| QUEUE_FLAG_DISCARD
;
1278 blk_queue_make_request(ns
->queue
, nvme_make_request
);
1280 ns
->queue
->queuedata
= ns
;
1282 disk
= alloc_disk(NVME_MINORS
);
1284 goto out_free_queue
;
1287 lbaf
= id
->flbas
& 0xf;
1288 ns
->lba_shift
= id
->lbaf
[lbaf
].ds
;
1290 disk
->major
= nvme_major
;
1291 disk
->minors
= NVME_MINORS
;
1292 disk
->first_minor
= NVME_MINORS
* nvme_get_ns_idx();
1293 disk
->fops
= &nvme_fops
;
1294 disk
->private_data
= ns
;
1295 disk
->queue
= ns
->queue
;
1296 disk
->driverfs_dev
= &dev
->pci_dev
->dev
;
1297 sprintf(disk
->disk_name
, "nvme%dn%d", dev
->instance
, nsid
);
1298 set_capacity(disk
, le64_to_cpup(&id
->nsze
) << (ns
->lba_shift
- 9));
1303 blk_cleanup_queue(ns
->queue
);
1309 static void nvme_ns_free(struct nvme_ns
*ns
)
1311 int index
= ns
->disk
->first_minor
/ NVME_MINORS
;
1313 nvme_put_ns_idx(index
);
1314 blk_cleanup_queue(ns
->queue
);
1318 static int set_queue_count(struct nvme_dev
*dev
, int count
)
1322 struct nvme_command c
;
1323 u32 q_count
= (count
- 1) | ((count
- 1) << 16);
1325 memset(&c
, 0, sizeof(c
));
1326 c
.features
.opcode
= nvme_admin_get_features
;
1327 c
.features
.fid
= cpu_to_le32(NVME_FEAT_NUM_QUEUES
);
1328 c
.features
.dword11
= cpu_to_le32(q_count
);
1330 status
= nvme_submit_admin_cmd(dev
, &c
, &result
);
1333 return min(result
& 0xffff, result
>> 16) + 1;
1336 static int __devinit
nvme_setup_io_queues(struct nvme_dev
*dev
)
1338 int result
, cpu
, i
, nr_io_queues
;
1340 nr_io_queues
= num_online_cpus();
1341 result
= set_queue_count(dev
, nr_io_queues
);
1344 if (result
< nr_io_queues
)
1345 nr_io_queues
= result
;
1347 /* Deregister the admin queue's interrupt */
1348 free_irq(dev
->entry
[0].vector
, dev
->queues
[0]);
1350 for (i
= 0; i
< nr_io_queues
; i
++)
1351 dev
->entry
[i
].entry
= i
;
1353 result
= pci_enable_msix(dev
->pci_dev
, dev
->entry
,
1357 } else if (result
> 0) {
1358 nr_io_queues
= result
;
1366 result
= queue_request_irq(dev
, dev
->queues
[0], "nvme admin");
1367 /* XXX: handle failure here */
1369 cpu
= cpumask_first(cpu_online_mask
);
1370 for (i
= 0; i
< nr_io_queues
; i
++) {
1371 irq_set_affinity_hint(dev
->entry
[i
].vector
, get_cpu_mask(cpu
));
1372 cpu
= cpumask_next(cpu
, cpu_online_mask
);
1375 for (i
= 0; i
< nr_io_queues
; i
++) {
1376 dev
->queues
[i
+ 1] = nvme_create_queue(dev
, i
+ 1,
1378 if (IS_ERR(dev
->queues
[i
+ 1]))
1379 return PTR_ERR(dev
->queues
[i
+ 1]);
1383 for (; i
< num_possible_cpus(); i
++) {
1384 int target
= i
% rounddown_pow_of_two(dev
->queue_count
- 1);
1385 dev
->queues
[i
+ 1] = dev
->queues
[target
+ 1];
1391 static void nvme_free_queues(struct nvme_dev
*dev
)
1395 for (i
= dev
->queue_count
- 1; i
>= 0; i
--)
1396 nvme_free_queue(dev
, i
);
1399 static int __devinit
nvme_dev_add(struct nvme_dev
*dev
)
1402 struct nvme_ns
*ns
, *next
;
1403 struct nvme_id_ctrl
*ctrl
;
1405 dma_addr_t dma_addr
;
1406 struct nvme_command cid
, crt
;
1408 res
= nvme_setup_io_queues(dev
);
1412 /* XXX: Switch to a SG list once prp2 works */
1413 id
= dma_alloc_coherent(&dev
->pci_dev
->dev
, 8192, &dma_addr
,
1416 memset(&cid
, 0, sizeof(cid
));
1417 cid
.identify
.opcode
= nvme_admin_identify
;
1418 cid
.identify
.nsid
= 0;
1419 cid
.identify
.prp1
= cpu_to_le64(dma_addr
);
1420 cid
.identify
.cns
= cpu_to_le32(1);
1422 res
= nvme_submit_admin_cmd(dev
, &cid
, NULL
);
1429 nn
= le32_to_cpup(&ctrl
->nn
);
1430 memcpy(dev
->serial
, ctrl
->sn
, sizeof(ctrl
->sn
));
1431 memcpy(dev
->model
, ctrl
->mn
, sizeof(ctrl
->mn
));
1432 memcpy(dev
->firmware_rev
, ctrl
->fr
, sizeof(ctrl
->fr
));
1434 cid
.identify
.cns
= 0;
1435 memset(&crt
, 0, sizeof(crt
));
1436 crt
.features
.opcode
= nvme_admin_get_features
;
1437 crt
.features
.prp1
= cpu_to_le64(dma_addr
+ 4096);
1438 crt
.features
.fid
= cpu_to_le32(NVME_FEAT_LBA_RANGE
);
1440 for (i
= 0; i
<= nn
; i
++) {
1441 cid
.identify
.nsid
= cpu_to_le32(i
);
1442 res
= nvme_submit_admin_cmd(dev
, &cid
, NULL
);
1446 if (((struct nvme_id_ns
*)id
)->ncap
== 0)
1449 crt
.features
.nsid
= cpu_to_le32(i
);
1450 res
= nvme_submit_admin_cmd(dev
, &crt
, NULL
);
1454 ns
= nvme_alloc_ns(dev
, i
, id
, id
+ 4096);
1456 list_add_tail(&ns
->list
, &dev
->namespaces
);
1458 list_for_each_entry(ns
, &dev
->namespaces
, list
)
1461 dma_free_coherent(&dev
->pci_dev
->dev
, 4096, id
, dma_addr
);
1465 list_for_each_entry_safe(ns
, next
, &dev
->namespaces
, list
) {
1466 list_del(&ns
->list
);
1470 dma_free_coherent(&dev
->pci_dev
->dev
, 4096, id
, dma_addr
);
1474 static int nvme_dev_remove(struct nvme_dev
*dev
)
1476 struct nvme_ns
*ns
, *next
;
1478 spin_lock(&dev_list_lock
);
1479 list_del(&dev
->node
);
1480 spin_unlock(&dev_list_lock
);
1482 /* TODO: wait all I/O finished or cancel them */
1484 list_for_each_entry_safe(ns
, next
, &dev
->namespaces
, list
) {
1485 list_del(&ns
->list
);
1486 del_gendisk(ns
->disk
);
1490 nvme_free_queues(dev
);
1495 static int nvme_setup_prp_pools(struct nvme_dev
*dev
)
1497 struct device
*dmadev
= &dev
->pci_dev
->dev
;
1498 dev
->prp_page_pool
= dma_pool_create("prp list page", dmadev
,
1499 PAGE_SIZE
, PAGE_SIZE
, 0);
1500 if (!dev
->prp_page_pool
)
1503 /* Optimisation for I/Os between 4k and 128k */
1504 dev
->prp_small_pool
= dma_pool_create("prp list 256", dmadev
,
1506 if (!dev
->prp_small_pool
) {
1507 dma_pool_destroy(dev
->prp_page_pool
);
1513 static void nvme_release_prp_pools(struct nvme_dev
*dev
)
1515 dma_pool_destroy(dev
->prp_page_pool
);
1516 dma_pool_destroy(dev
->prp_small_pool
);
1519 /* XXX: Use an ida or something to let remove / add work correctly */
1520 static void nvme_set_instance(struct nvme_dev
*dev
)
1522 static int instance
;
1523 dev
->instance
= instance
++;
1526 static void nvme_release_instance(struct nvme_dev
*dev
)
1530 static int __devinit
nvme_probe(struct pci_dev
*pdev
,
1531 const struct pci_device_id
*id
)
1533 int bars
, result
= -ENOMEM
;
1534 struct nvme_dev
*dev
;
1536 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
1539 dev
->entry
= kcalloc(num_possible_cpus(), sizeof(*dev
->entry
),
1543 dev
->queues
= kcalloc(num_possible_cpus() + 1, sizeof(void *),
1548 if (pci_enable_device_mem(pdev
))
1550 pci_set_master(pdev
);
1551 bars
= pci_select_bars(pdev
, IORESOURCE_MEM
);
1552 if (pci_request_selected_regions(pdev
, bars
, "nvme"))
1555 INIT_LIST_HEAD(&dev
->namespaces
);
1556 dev
->pci_dev
= pdev
;
1557 pci_set_drvdata(pdev
, dev
);
1558 dma_set_mask(&pdev
->dev
, DMA_BIT_MASK(64));
1559 dma_set_coherent_mask(&pdev
->dev
, DMA_BIT_MASK(64));
1560 nvme_set_instance(dev
);
1561 dev
->entry
[0].vector
= pdev
->irq
;
1563 result
= nvme_setup_prp_pools(dev
);
1567 dev
->bar
= ioremap(pci_resource_start(pdev
, 0), 8192);
1573 result
= nvme_configure_admin_queue(dev
);
1578 spin_lock(&dev_list_lock
);
1579 list_add(&dev
->node
, &dev_list
);
1580 spin_unlock(&dev_list_lock
);
1582 result
= nvme_dev_add(dev
);
1589 spin_lock(&dev_list_lock
);
1590 list_del(&dev
->node
);
1591 spin_unlock(&dev_list_lock
);
1593 nvme_free_queues(dev
);
1597 pci_disable_msix(pdev
);
1598 nvme_release_instance(dev
);
1599 nvme_release_prp_pools(dev
);
1601 pci_disable_device(pdev
);
1602 pci_release_regions(pdev
);
1610 static void __devexit
nvme_remove(struct pci_dev
*pdev
)
1612 struct nvme_dev
*dev
= pci_get_drvdata(pdev
);
1613 nvme_dev_remove(dev
);
1614 pci_disable_msix(pdev
);
1616 nvme_release_instance(dev
);
1617 nvme_release_prp_pools(dev
);
1618 pci_disable_device(pdev
);
1619 pci_release_regions(pdev
);
1625 /* These functions are yet to be implemented */
1626 #define nvme_error_detected NULL
1627 #define nvme_dump_registers NULL
1628 #define nvme_link_reset NULL
1629 #define nvme_slot_reset NULL
1630 #define nvme_error_resume NULL
1631 #define nvme_suspend NULL
1632 #define nvme_resume NULL
1634 static struct pci_error_handlers nvme_err_handler
= {
1635 .error_detected
= nvme_error_detected
,
1636 .mmio_enabled
= nvme_dump_registers
,
1637 .link_reset
= nvme_link_reset
,
1638 .slot_reset
= nvme_slot_reset
,
1639 .resume
= nvme_error_resume
,
1642 /* Move to pci_ids.h later */
1643 #define PCI_CLASS_STORAGE_EXPRESS 0x010802
1645 static DEFINE_PCI_DEVICE_TABLE(nvme_id_table
) = {
1646 { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS
, 0xffffff) },
1649 MODULE_DEVICE_TABLE(pci
, nvme_id_table
);
1651 static struct pci_driver nvme_driver
= {
1653 .id_table
= nvme_id_table
,
1654 .probe
= nvme_probe
,
1655 .remove
= __devexit_p(nvme_remove
),
1656 .suspend
= nvme_suspend
,
1657 .resume
= nvme_resume
,
1658 .err_handler
= &nvme_err_handler
,
1661 static int __init
nvme_init(void)
1663 int result
= -EBUSY
;
1665 nvme_thread
= kthread_run(nvme_kthread
, NULL
, "nvme");
1666 if (IS_ERR(nvme_thread
))
1667 return PTR_ERR(nvme_thread
);
1669 nvme_major
= register_blkdev(nvme_major
, "nvme");
1670 if (nvme_major
<= 0)
1673 result
= pci_register_driver(&nvme_driver
);
1675 goto unregister_blkdev
;
1679 unregister_blkdev(nvme_major
, "nvme");
1681 kthread_stop(nvme_thread
);
1685 static void __exit
nvme_exit(void)
1687 pci_unregister_driver(&nvme_driver
);
1688 unregister_blkdev(nvme_major
, "nvme");
1689 kthread_stop(nvme_thread
);
1692 MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>");
1693 MODULE_LICENSE("GPL");
1694 MODULE_VERSION("0.6");
1695 module_init(nvme_init
);
1696 module_exit(nvme_exit
);