Commit | Line | Data |
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21d34711 CH |
1 | /* |
2 | * NVM Express device driver | |
3 | * Copyright (c) 2011-2014, Intel Corporation. | |
4 | * | |
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. | |
8 | * | |
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 | |
12 | * more details. | |
13 | */ | |
14 | ||
15 | #include <linux/blkdev.h> | |
16 | #include <linux/blk-mq.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/types.h> | |
21 | ||
22 | #include "nvme.h" | |
23 | ||
4160982e CH |
24 | struct request *nvme_alloc_request(struct request_queue *q, |
25 | struct nvme_command *cmd, unsigned int flags) | |
21d34711 CH |
26 | { |
27 | bool write = cmd->common.opcode & 1; | |
21d34711 | 28 | struct request *req; |
21d34711 | 29 | |
4160982e | 30 | req = blk_mq_alloc_request(q, write, flags); |
21d34711 | 31 | if (IS_ERR(req)) |
4160982e | 32 | return req; |
21d34711 CH |
33 | |
34 | req->cmd_type = REQ_TYPE_DRV_PRIV; | |
35 | req->cmd_flags |= REQ_FAILFAST_DRIVER; | |
36 | req->__data_len = 0; | |
37 | req->__sector = (sector_t) -1; | |
38 | req->bio = req->biotail = NULL; | |
39 | ||
21d34711 CH |
40 | req->cmd = (unsigned char *)cmd; |
41 | req->cmd_len = sizeof(struct nvme_command); | |
42 | req->special = (void *)0; | |
43 | ||
4160982e CH |
44 | return req; |
45 | } | |
46 | ||
47 | /* | |
48 | * Returns 0 on success. If the result is negative, it's a Linux error code; | |
49 | * if the result is positive, it's an NVM Express status code | |
50 | */ | |
51 | int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, | |
52 | void *buffer, unsigned bufflen, u32 *result, unsigned timeout) | |
53 | { | |
54 | struct request *req; | |
55 | int ret; | |
56 | ||
57 | req = nvme_alloc_request(q, cmd, 0); | |
58 | if (IS_ERR(req)) | |
59 | return PTR_ERR(req); | |
60 | ||
61 | req->timeout = timeout ? timeout : ADMIN_TIMEOUT; | |
62 | ||
21d34711 CH |
63 | if (buffer && bufflen) { |
64 | ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL); | |
65 | if (ret) | |
66 | goto out; | |
4160982e CH |
67 | } |
68 | ||
69 | blk_execute_rq(req->q, NULL, req, 0); | |
70 | if (result) | |
71 | *result = (u32)(uintptr_t)req->special; | |
72 | ret = req->errors; | |
73 | out: | |
74 | blk_mq_free_request(req); | |
75 | return ret; | |
76 | } | |
77 | ||
78 | int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, | |
79 | void *buffer, unsigned bufflen) | |
80 | { | |
81 | return __nvme_submit_sync_cmd(q, cmd, buffer, bufflen, NULL, 0); | |
82 | } | |
83 | ||
0b7f1f26 KB |
84 | int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd, |
85 | void __user *ubuffer, unsigned bufflen, | |
86 | void __user *meta_buffer, unsigned meta_len, u32 meta_seed, | |
87 | u32 *result, unsigned timeout) | |
4160982e | 88 | { |
0b7f1f26 KB |
89 | bool write = cmd->common.opcode & 1; |
90 | struct nvme_ns *ns = q->queuedata; | |
91 | struct gendisk *disk = ns ? ns->disk : NULL; | |
4160982e | 92 | struct request *req; |
0b7f1f26 KB |
93 | struct bio *bio = NULL; |
94 | void *meta = NULL; | |
4160982e CH |
95 | int ret; |
96 | ||
97 | req = nvme_alloc_request(q, cmd, 0); | |
98 | if (IS_ERR(req)) | |
99 | return PTR_ERR(req); | |
100 | ||
101 | req->timeout = timeout ? timeout : ADMIN_TIMEOUT; | |
102 | ||
103 | if (ubuffer && bufflen) { | |
21d34711 CH |
104 | ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen, |
105 | GFP_KERNEL); | |
106 | if (ret) | |
107 | goto out; | |
108 | bio = req->bio; | |
21d34711 | 109 | |
0b7f1f26 KB |
110 | if (!disk) |
111 | goto submit; | |
112 | bio->bi_bdev = bdget_disk(disk, 0); | |
113 | if (!bio->bi_bdev) { | |
114 | ret = -ENODEV; | |
115 | goto out_unmap; | |
116 | } | |
117 | ||
118 | if (meta_buffer) { | |
119 | struct bio_integrity_payload *bip; | |
120 | ||
121 | meta = kmalloc(meta_len, GFP_KERNEL); | |
122 | if (!meta) { | |
123 | ret = -ENOMEM; | |
124 | goto out_unmap; | |
125 | } | |
126 | ||
127 | if (write) { | |
128 | if (copy_from_user(meta, meta_buffer, | |
129 | meta_len)) { | |
130 | ret = -EFAULT; | |
131 | goto out_free_meta; | |
132 | } | |
133 | } | |
134 | ||
135 | bip = bio_integrity_alloc(bio, GFP_KERNEL, 1); | |
136 | if (!bip) { | |
137 | ret = -ENOMEM; | |
138 | goto out_free_meta; | |
139 | } | |
140 | ||
141 | bip->bip_iter.bi_size = meta_len; | |
142 | bip->bip_iter.bi_sector = meta_seed; | |
143 | ||
144 | ret = bio_integrity_add_page(bio, virt_to_page(meta), | |
145 | meta_len, offset_in_page(meta)); | |
146 | if (ret != meta_len) { | |
147 | ret = -ENOMEM; | |
148 | goto out_free_meta; | |
149 | } | |
150 | } | |
151 | } | |
152 | submit: | |
153 | blk_execute_rq(req->q, disk, req, 0); | |
154 | ret = req->errors; | |
21d34711 CH |
155 | if (result) |
156 | *result = (u32)(uintptr_t)req->special; | |
0b7f1f26 KB |
157 | if (meta && !ret && !write) { |
158 | if (copy_to_user(meta_buffer, meta, meta_len)) | |
159 | ret = -EFAULT; | |
160 | } | |
161 | out_free_meta: | |
162 | kfree(meta); | |
163 | out_unmap: | |
164 | if (bio) { | |
165 | if (disk && bio->bi_bdev) | |
166 | bdput(bio->bi_bdev); | |
167 | blk_rq_unmap_user(bio); | |
168 | } | |
21d34711 CH |
169 | out: |
170 | blk_mq_free_request(req); | |
171 | return ret; | |
172 | } | |
173 | ||
0b7f1f26 KB |
174 | int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd, |
175 | void __user *ubuffer, unsigned bufflen, u32 *result, | |
176 | unsigned timeout) | |
177 | { | |
178 | return __nvme_submit_user_cmd(q, cmd, ubuffer, bufflen, NULL, 0, 0, | |
179 | result, timeout); | |
180 | } | |
181 | ||
1c63dc66 | 182 | int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id) |
21d34711 CH |
183 | { |
184 | struct nvme_command c = { }; | |
185 | int error; | |
186 | ||
187 | /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ | |
188 | c.identify.opcode = nvme_admin_identify; | |
189 | c.identify.cns = cpu_to_le32(1); | |
190 | ||
191 | *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL); | |
192 | if (!*id) | |
193 | return -ENOMEM; | |
194 | ||
195 | error = nvme_submit_sync_cmd(dev->admin_q, &c, *id, | |
196 | sizeof(struct nvme_id_ctrl)); | |
197 | if (error) | |
198 | kfree(*id); | |
199 | return error; | |
200 | } | |
201 | ||
1c63dc66 | 202 | int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid, |
21d34711 CH |
203 | struct nvme_id_ns **id) |
204 | { | |
205 | struct nvme_command c = { }; | |
206 | int error; | |
207 | ||
208 | /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ | |
209 | c.identify.opcode = nvme_admin_identify, | |
210 | c.identify.nsid = cpu_to_le32(nsid), | |
211 | ||
212 | *id = kmalloc(sizeof(struct nvme_id_ns), GFP_KERNEL); | |
213 | if (!*id) | |
214 | return -ENOMEM; | |
215 | ||
216 | error = nvme_submit_sync_cmd(dev->admin_q, &c, *id, | |
217 | sizeof(struct nvme_id_ns)); | |
218 | if (error) | |
219 | kfree(*id); | |
220 | return error; | |
221 | } | |
222 | ||
1c63dc66 | 223 | int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid, |
21d34711 CH |
224 | dma_addr_t dma_addr, u32 *result) |
225 | { | |
226 | struct nvme_command c; | |
227 | ||
228 | memset(&c, 0, sizeof(c)); | |
229 | c.features.opcode = nvme_admin_get_features; | |
230 | c.features.nsid = cpu_to_le32(nsid); | |
231 | c.features.prp1 = cpu_to_le64(dma_addr); | |
232 | c.features.fid = cpu_to_le32(fid); | |
233 | ||
4160982e | 234 | return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0, result, 0); |
21d34711 CH |
235 | } |
236 | ||
1c63dc66 | 237 | int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11, |
21d34711 CH |
238 | dma_addr_t dma_addr, u32 *result) |
239 | { | |
240 | struct nvme_command c; | |
241 | ||
242 | memset(&c, 0, sizeof(c)); | |
243 | c.features.opcode = nvme_admin_set_features; | |
244 | c.features.prp1 = cpu_to_le64(dma_addr); | |
245 | c.features.fid = cpu_to_le32(fid); | |
246 | c.features.dword11 = cpu_to_le32(dword11); | |
247 | ||
4160982e | 248 | return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0, result, 0); |
21d34711 CH |
249 | } |
250 | ||
1c63dc66 | 251 | int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log) |
21d34711 CH |
252 | { |
253 | struct nvme_command c = { }; | |
254 | int error; | |
255 | ||
256 | c.common.opcode = nvme_admin_get_log_page, | |
257 | c.common.nsid = cpu_to_le32(0xFFFFFFFF), | |
258 | c.common.cdw10[0] = cpu_to_le32( | |
259 | (((sizeof(struct nvme_smart_log) / 4) - 1) << 16) | | |
260 | NVME_LOG_SMART), | |
261 | ||
262 | *log = kmalloc(sizeof(struct nvme_smart_log), GFP_KERNEL); | |
263 | if (!*log) | |
264 | return -ENOMEM; | |
265 | ||
266 | error = nvme_submit_sync_cmd(dev->admin_q, &c, *log, | |
267 | sizeof(struct nvme_smart_log)); | |
268 | if (error) | |
269 | kfree(*log); | |
270 | return error; | |
271 | } |