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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 | ||
84 | int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd, | |
85 | void __user *ubuffer, unsigned bufflen, u32 *result, | |
86 | unsigned timeout) | |
87 | { | |
88 | struct bio *bio = NULL; | |
89 | struct request *req; | |
90 | int ret; | |
91 | ||
92 | req = nvme_alloc_request(q, cmd, 0); | |
93 | if (IS_ERR(req)) | |
94 | return PTR_ERR(req); | |
95 | ||
96 | req->timeout = timeout ? timeout : ADMIN_TIMEOUT; | |
97 | ||
98 | if (ubuffer && bufflen) { | |
21d34711 CH |
99 | ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen, |
100 | GFP_KERNEL); | |
101 | if (ret) | |
102 | goto out; | |
103 | bio = req->bio; | |
104 | } | |
105 | ||
106 | blk_execute_rq(req->q, NULL, req, 0); | |
107 | if (bio) | |
108 | blk_rq_unmap_user(bio); | |
109 | if (result) | |
110 | *result = (u32)(uintptr_t)req->special; | |
111 | ret = req->errors; | |
112 | out: | |
113 | blk_mq_free_request(req); | |
114 | return ret; | |
115 | } | |
116 | ||
1c63dc66 | 117 | int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id) |
21d34711 CH |
118 | { |
119 | struct nvme_command c = { }; | |
120 | int error; | |
121 | ||
122 | /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ | |
123 | c.identify.opcode = nvme_admin_identify; | |
124 | c.identify.cns = cpu_to_le32(1); | |
125 | ||
126 | *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL); | |
127 | if (!*id) | |
128 | return -ENOMEM; | |
129 | ||
130 | error = nvme_submit_sync_cmd(dev->admin_q, &c, *id, | |
131 | sizeof(struct nvme_id_ctrl)); | |
132 | if (error) | |
133 | kfree(*id); | |
134 | return error; | |
135 | } | |
136 | ||
1c63dc66 | 137 | int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid, |
21d34711 CH |
138 | struct nvme_id_ns **id) |
139 | { | |
140 | struct nvme_command c = { }; | |
141 | int error; | |
142 | ||
143 | /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ | |
144 | c.identify.opcode = nvme_admin_identify, | |
145 | c.identify.nsid = cpu_to_le32(nsid), | |
146 | ||
147 | *id = kmalloc(sizeof(struct nvme_id_ns), GFP_KERNEL); | |
148 | if (!*id) | |
149 | return -ENOMEM; | |
150 | ||
151 | error = nvme_submit_sync_cmd(dev->admin_q, &c, *id, | |
152 | sizeof(struct nvme_id_ns)); | |
153 | if (error) | |
154 | kfree(*id); | |
155 | return error; | |
156 | } | |
157 | ||
1c63dc66 | 158 | int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid, |
21d34711 CH |
159 | dma_addr_t dma_addr, u32 *result) |
160 | { | |
161 | struct nvme_command c; | |
162 | ||
163 | memset(&c, 0, sizeof(c)); | |
164 | c.features.opcode = nvme_admin_get_features; | |
165 | c.features.nsid = cpu_to_le32(nsid); | |
166 | c.features.prp1 = cpu_to_le64(dma_addr); | |
167 | c.features.fid = cpu_to_le32(fid); | |
168 | ||
4160982e | 169 | return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0, result, 0); |
21d34711 CH |
170 | } |
171 | ||
1c63dc66 | 172 | int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11, |
21d34711 CH |
173 | dma_addr_t dma_addr, u32 *result) |
174 | { | |
175 | struct nvme_command c; | |
176 | ||
177 | memset(&c, 0, sizeof(c)); | |
178 | c.features.opcode = nvme_admin_set_features; | |
179 | c.features.prp1 = cpu_to_le64(dma_addr); | |
180 | c.features.fid = cpu_to_le32(fid); | |
181 | c.features.dword11 = cpu_to_le32(dword11); | |
182 | ||
4160982e | 183 | return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0, result, 0); |
21d34711 CH |
184 | } |
185 | ||
1c63dc66 | 186 | int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log) |
21d34711 CH |
187 | { |
188 | struct nvme_command c = { }; | |
189 | int error; | |
190 | ||
191 | c.common.opcode = nvme_admin_get_log_page, | |
192 | c.common.nsid = cpu_to_le32(0xFFFFFFFF), | |
193 | c.common.cdw10[0] = cpu_to_le32( | |
194 | (((sizeof(struct nvme_smart_log) / 4) - 1) << 16) | | |
195 | NVME_LOG_SMART), | |
196 | ||
197 | *log = kmalloc(sizeof(struct nvme_smart_log), GFP_KERNEL); | |
198 | if (!*log) | |
199 | return -ENOMEM; | |
200 | ||
201 | error = nvme_submit_sync_cmd(dev->admin_q, &c, *log, | |
202 | sizeof(struct nvme_smart_log)); | |
203 | if (error) | |
204 | kfree(*log); | |
205 | return error; | |
206 | } |