2 * NVMe I/O command implementation.
3 * Copyright (c) 2015-2016 HGST, a Western Digital Company.
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15 #include <linux/blkdev.h>
16 #include <linux/module.h>
19 static void nvmet_bio_done(struct bio
*bio
)
21 struct nvmet_req
*req
= bio
->bi_private
;
23 nvmet_req_complete(req
,
24 bio
->bi_error
? NVME_SC_INTERNAL
| NVME_SC_DNR
: 0);
26 if (bio
!= &req
->inline_bio
)
30 static inline u32
nvmet_rw_len(struct nvmet_req
*req
)
32 return ((u32
)le16_to_cpu(req
->cmd
->rw
.length
) + 1) <<
33 req
->ns
->blksize_shift
;
36 static void nvmet_inline_bio_init(struct nvmet_req
*req
)
38 struct bio
*bio
= &req
->inline_bio
;
40 bio_init(bio
, req
->inline_bvec
, NVMET_MAX_INLINE_BIOVEC
);
43 static void nvmet_execute_rw(struct nvmet_req
*req
)
45 int sg_cnt
= req
->sg_cnt
;
46 struct scatterlist
*sg
;
50 int op
, op_flags
= 0, i
;
53 nvmet_req_complete(req
, 0);
57 if (req
->cmd
->rw
.opcode
== nvme_cmd_write
) {
59 op_flags
= REQ_SYNC
| REQ_IDLE
;
60 if (req
->cmd
->rw
.control
& cpu_to_le16(NVME_RW_FUA
))
66 sector
= le64_to_cpu(req
->cmd
->rw
.slba
);
67 sector
<<= (req
->ns
->blksize_shift
- 9);
69 nvmet_inline_bio_init(req
);
70 bio
= &req
->inline_bio
;
71 bio
->bi_bdev
= req
->ns
->bdev
;
72 bio
->bi_iter
.bi_sector
= sector
;
73 bio
->bi_private
= req
;
74 bio
->bi_end_io
= nvmet_bio_done
;
75 bio_set_op_attrs(bio
, op
, op_flags
);
77 for_each_sg(req
->sg
, sg
, req
->sg_cnt
, i
) {
78 while (bio_add_page(bio
, sg_page(sg
), sg
->length
, sg
->offset
)
80 struct bio
*prev
= bio
;
82 bio
= bio_alloc(GFP_KERNEL
, min(sg_cnt
, BIO_MAX_PAGES
));
83 bio
->bi_bdev
= req
->ns
->bdev
;
84 bio
->bi_iter
.bi_sector
= sector
;
85 bio_set_op_attrs(bio
, op
, op_flags
);
88 cookie
= submit_bio(prev
);
91 sector
+= sg
->length
>> 9;
95 cookie
= submit_bio(bio
);
97 blk_mq_poll(bdev_get_queue(req
->ns
->bdev
), cookie
);
100 static void nvmet_execute_flush(struct nvmet_req
*req
)
104 nvmet_inline_bio_init(req
);
105 bio
= &req
->inline_bio
;
107 bio
->bi_bdev
= req
->ns
->bdev
;
108 bio
->bi_private
= req
;
109 bio
->bi_end_io
= nvmet_bio_done
;
110 bio
->bi_opf
= REQ_OP_WRITE
| REQ_PREFLUSH
;
115 static u16
nvmet_discard_range(struct nvmet_ns
*ns
,
116 struct nvme_dsm_range
*range
, struct bio
**bio
)
118 if (__blkdev_issue_discard(ns
->bdev
,
119 le64_to_cpu(range
->slba
) << (ns
->blksize_shift
- 9),
120 le32_to_cpu(range
->nlb
) << (ns
->blksize_shift
- 9),
122 return NVME_SC_INTERNAL
| NVME_SC_DNR
;
126 static void nvmet_execute_discard(struct nvmet_req
*req
)
128 struct nvme_dsm_range range
;
129 struct bio
*bio
= NULL
;
133 for (i
= 0; i
<= le32_to_cpu(req
->cmd
->dsm
.nr
); i
++) {
134 status
= nvmet_copy_from_sgl(req
, i
* sizeof(range
), &range
,
139 status
= nvmet_discard_range(req
->ns
, &range
, &bio
);
145 bio
->bi_private
= req
;
146 bio
->bi_end_io
= nvmet_bio_done
;
148 bio
->bi_error
= -EIO
;
154 nvmet_req_complete(req
, status
);
158 static void nvmet_execute_dsm(struct nvmet_req
*req
)
160 switch (le32_to_cpu(req
->cmd
->dsm
.attributes
)) {
162 nvmet_execute_discard(req
);
164 case NVME_DSMGMT_IDR
:
165 case NVME_DSMGMT_IDW
:
167 /* Not supported yet */
168 nvmet_req_complete(req
, 0);
173 static void nvmet_execute_write_zeroes(struct nvmet_req
*req
)
175 struct nvme_write_zeroes_cmd
*write_zeroes
= &req
->cmd
->write_zeroes
;
176 struct bio
*bio
= NULL
;
177 u16 status
= NVME_SC_SUCCESS
;
181 sector
= le64_to_cpu(write_zeroes
->slba
) <<
182 (req
->ns
->blksize_shift
- 9);
183 nr_sector
= (((sector_t
)le16_to_cpu(write_zeroes
->length
)) <<
184 (req
->ns
->blksize_shift
- 9)) + 1;
186 if (__blkdev_issue_zeroout(req
->ns
->bdev
, sector
, nr_sector
,
187 GFP_KERNEL
, &bio
, 0))
188 status
= NVME_SC_INTERNAL
| NVME_SC_DNR
;
191 bio
->bi_private
= req
;
192 bio
->bi_end_io
= nvmet_bio_done
;
195 nvmet_req_complete(req
, status
);
199 u16
nvmet_parse_io_cmd(struct nvmet_req
*req
)
201 struct nvme_command
*cmd
= req
->cmd
;
204 ret
= nvmet_check_ctrl_status(req
, cmd
);
210 req
->ns
= nvmet_find_namespace(req
->sq
->ctrl
, cmd
->rw
.nsid
);
211 if (unlikely(!req
->ns
))
212 return NVME_SC_INVALID_NS
| NVME_SC_DNR
;
214 switch (cmd
->common
.opcode
) {
217 req
->execute
= nvmet_execute_rw
;
218 req
->data_len
= nvmet_rw_len(req
);
221 req
->execute
= nvmet_execute_flush
;
225 req
->execute
= nvmet_execute_dsm
;
226 req
->data_len
= (le32_to_cpu(cmd
->dsm
.nr
) + 1) *
227 sizeof(struct nvme_dsm_range
);
229 case nvme_cmd_write_zeroes
:
230 req
->execute
= nvmet_execute_write_zeroes
;
233 pr_err("unhandled cmd %d on qid %d\n", cmd
->common
.opcode
,
235 return NVME_SC_INVALID_OPCODE
| NVME_SC_DNR
;