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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 | ||
24 | /* | |
25 | * Returns 0 on success. If the result is negative, it's a Linux error code; | |
26 | * if the result is positive, it's an NVM Express status code | |
27 | */ | |
28 | int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, | |
29 | void *buffer, void __user *ubuffer, unsigned bufflen, | |
30 | u32 *result, unsigned timeout) | |
31 | { | |
32 | bool write = cmd->common.opcode & 1; | |
33 | struct bio *bio = NULL; | |
34 | struct request *req; | |
35 | int ret; | |
36 | ||
37 | req = blk_mq_alloc_request(q, write, 0); | |
38 | if (IS_ERR(req)) | |
39 | return PTR_ERR(req); | |
40 | ||
41 | req->cmd_type = REQ_TYPE_DRV_PRIV; | |
42 | req->cmd_flags |= REQ_FAILFAST_DRIVER; | |
43 | req->__data_len = 0; | |
44 | req->__sector = (sector_t) -1; | |
45 | req->bio = req->biotail = NULL; | |
46 | ||
47 | req->timeout = timeout ? timeout : ADMIN_TIMEOUT; | |
48 | ||
49 | req->cmd = (unsigned char *)cmd; | |
50 | req->cmd_len = sizeof(struct nvme_command); | |
51 | req->special = (void *)0; | |
52 | ||
53 | if (buffer && bufflen) { | |
54 | ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL); | |
55 | if (ret) | |
56 | goto out; | |
57 | } else if (ubuffer && bufflen) { | |
58 | ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen, | |
59 | GFP_KERNEL); | |
60 | if (ret) | |
61 | goto out; | |
62 | bio = req->bio; | |
63 | } | |
64 | ||
65 | blk_execute_rq(req->q, NULL, req, 0); | |
66 | if (bio) | |
67 | blk_rq_unmap_user(bio); | |
68 | if (result) | |
69 | *result = (u32)(uintptr_t)req->special; | |
70 | ret = req->errors; | |
71 | out: | |
72 | blk_mq_free_request(req); | |
73 | return ret; | |
74 | } | |
75 | ||
76 | int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, | |
77 | void *buffer, unsigned bufflen) | |
78 | { | |
79 | return __nvme_submit_sync_cmd(q, cmd, buffer, NULL, bufflen, NULL, 0); | |
80 | } | |
81 | ||
82 | int nvme_identify_ctrl(struct nvme_dev *dev, struct nvme_id_ctrl **id) | |
83 | { | |
84 | struct nvme_command c = { }; | |
85 | int error; | |
86 | ||
87 | /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ | |
88 | c.identify.opcode = nvme_admin_identify; | |
89 | c.identify.cns = cpu_to_le32(1); | |
90 | ||
91 | *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL); | |
92 | if (!*id) | |
93 | return -ENOMEM; | |
94 | ||
95 | error = nvme_submit_sync_cmd(dev->admin_q, &c, *id, | |
96 | sizeof(struct nvme_id_ctrl)); | |
97 | if (error) | |
98 | kfree(*id); | |
99 | return error; | |
100 | } | |
101 | ||
102 | int nvme_identify_ns(struct nvme_dev *dev, unsigned nsid, | |
103 | struct nvme_id_ns **id) | |
104 | { | |
105 | struct nvme_command c = { }; | |
106 | int error; | |
107 | ||
108 | /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ | |
109 | c.identify.opcode = nvme_admin_identify, | |
110 | c.identify.nsid = cpu_to_le32(nsid), | |
111 | ||
112 | *id = kmalloc(sizeof(struct nvme_id_ns), GFP_KERNEL); | |
113 | if (!*id) | |
114 | return -ENOMEM; | |
115 | ||
116 | error = nvme_submit_sync_cmd(dev->admin_q, &c, *id, | |
117 | sizeof(struct nvme_id_ns)); | |
118 | if (error) | |
119 | kfree(*id); | |
120 | return error; | |
121 | } | |
122 | ||
123 | int nvme_get_features(struct nvme_dev *dev, unsigned fid, unsigned nsid, | |
124 | dma_addr_t dma_addr, u32 *result) | |
125 | { | |
126 | struct nvme_command c; | |
127 | ||
128 | memset(&c, 0, sizeof(c)); | |
129 | c.features.opcode = nvme_admin_get_features; | |
130 | c.features.nsid = cpu_to_le32(nsid); | |
131 | c.features.prp1 = cpu_to_le64(dma_addr); | |
132 | c.features.fid = cpu_to_le32(fid); | |
133 | ||
134 | return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, NULL, 0, | |
135 | result, 0); | |
136 | } | |
137 | ||
138 | int nvme_set_features(struct nvme_dev *dev, unsigned fid, unsigned dword11, | |
139 | dma_addr_t dma_addr, u32 *result) | |
140 | { | |
141 | struct nvme_command c; | |
142 | ||
143 | memset(&c, 0, sizeof(c)); | |
144 | c.features.opcode = nvme_admin_set_features; | |
145 | c.features.prp1 = cpu_to_le64(dma_addr); | |
146 | c.features.fid = cpu_to_le32(fid); | |
147 | c.features.dword11 = cpu_to_le32(dword11); | |
148 | ||
149 | return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, NULL, 0, | |
150 | result, 0); | |
151 | } | |
152 | ||
153 | int nvme_get_log_page(struct nvme_dev *dev, struct nvme_smart_log **log) | |
154 | { | |
155 | struct nvme_command c = { }; | |
156 | int error; | |
157 | ||
158 | c.common.opcode = nvme_admin_get_log_page, | |
159 | c.common.nsid = cpu_to_le32(0xFFFFFFFF), | |
160 | c.common.cdw10[0] = cpu_to_le32( | |
161 | (((sizeof(struct nvme_smart_log) / 4) - 1) << 16) | | |
162 | NVME_LOG_SMART), | |
163 | ||
164 | *log = kmalloc(sizeof(struct nvme_smart_log), GFP_KERNEL); | |
165 | if (!*log) | |
166 | return -ENOMEM; | |
167 | ||
168 | error = nvme_submit_sync_cmd(dev->admin_q, &c, *log, | |
169 | sizeof(struct nvme_smart_log)); | |
170 | if (error) | |
171 | kfree(*log); | |
172 | return error; | |
173 | } |