This source file includes following definitions.
- ufs_bsg_get_query_desc_size
- ufs_bsg_verify_query_size
- ufs_bsg_alloc_desc_buffer
- ufs_bsg_request
- ufs_bsg_remove
- ufs_bsg_node_release
- ufs_bsg_probe
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7 #include "ufs_bsg.h"
8
9 static int ufs_bsg_get_query_desc_size(struct ufs_hba *hba, int *desc_len,
10 struct utp_upiu_query *qr)
11 {
12 int desc_size = be16_to_cpu(qr->length);
13 int desc_id = qr->idn;
14 int ret;
15
16 if (desc_size <= 0)
17 return -EINVAL;
18
19 ret = ufshcd_map_desc_id_to_length(hba, desc_id, desc_len);
20 if (ret || !*desc_len)
21 return -EINVAL;
22
23 *desc_len = min_t(int, *desc_len, desc_size);
24
25 return 0;
26 }
27
28 static int ufs_bsg_verify_query_size(struct ufs_hba *hba,
29 unsigned int request_len,
30 unsigned int reply_len)
31 {
32 int min_req_len = sizeof(struct ufs_bsg_request);
33 int min_rsp_len = sizeof(struct ufs_bsg_reply);
34
35 if (min_req_len > request_len || min_rsp_len > reply_len) {
36 dev_err(hba->dev, "not enough space assigned\n");
37 return -EINVAL;
38 }
39
40 return 0;
41 }
42
43 static int ufs_bsg_alloc_desc_buffer(struct ufs_hba *hba, struct bsg_job *job,
44 uint8_t **desc_buff, int *desc_len,
45 enum query_opcode desc_op)
46 {
47 struct ufs_bsg_request *bsg_request = job->request;
48 struct utp_upiu_query *qr;
49 u8 *descp;
50
51 if (desc_op != UPIU_QUERY_OPCODE_WRITE_DESC &&
52 desc_op != UPIU_QUERY_OPCODE_READ_DESC)
53 goto out;
54
55 qr = &bsg_request->upiu_req.qr;
56 if (ufs_bsg_get_query_desc_size(hba, desc_len, qr)) {
57 dev_err(hba->dev, "Illegal desc size\n");
58 return -EINVAL;
59 }
60
61 if (*desc_len > job->request_payload.payload_len) {
62 dev_err(hba->dev, "Illegal desc size\n");
63 return -EINVAL;
64 }
65
66 descp = kzalloc(*desc_len, GFP_KERNEL);
67 if (!descp)
68 return -ENOMEM;
69
70 if (desc_op == UPIU_QUERY_OPCODE_WRITE_DESC)
71 sg_copy_to_buffer(job->request_payload.sg_list,
72 job->request_payload.sg_cnt, descp,
73 *desc_len);
74
75 *desc_buff = descp;
76
77 out:
78 return 0;
79 }
80
81 static int ufs_bsg_request(struct bsg_job *job)
82 {
83 struct ufs_bsg_request *bsg_request = job->request;
84 struct ufs_bsg_reply *bsg_reply = job->reply;
85 struct ufs_hba *hba = shost_priv(dev_to_shost(job->dev->parent));
86 unsigned int req_len = job->request_len;
87 unsigned int reply_len = job->reply_len;
88 struct uic_command uc = {};
89 int msgcode;
90 uint8_t *desc_buff = NULL;
91 int desc_len = 0;
92 enum query_opcode desc_op = UPIU_QUERY_OPCODE_NOP;
93 int ret;
94
95 ret = ufs_bsg_verify_query_size(hba, req_len, reply_len);
96 if (ret)
97 goto out;
98
99 bsg_reply->reply_payload_rcv_len = 0;
100
101 pm_runtime_get_sync(hba->dev);
102
103 msgcode = bsg_request->msgcode;
104 switch (msgcode) {
105 case UPIU_TRANSACTION_QUERY_REQ:
106 desc_op = bsg_request->upiu_req.qr.opcode;
107 ret = ufs_bsg_alloc_desc_buffer(hba, job, &desc_buff,
108 &desc_len, desc_op);
109 if (ret)
110 goto out;
111
112
113 case UPIU_TRANSACTION_NOP_OUT:
114 case UPIU_TRANSACTION_TASK_REQ:
115 ret = ufshcd_exec_raw_upiu_cmd(hba, &bsg_request->upiu_req,
116 &bsg_reply->upiu_rsp, msgcode,
117 desc_buff, &desc_len, desc_op);
118 if (ret)
119 dev_err(hba->dev,
120 "exe raw upiu: error code %d\n", ret);
121
122 break;
123 case UPIU_TRANSACTION_UIC_CMD:
124 memcpy(&uc, &bsg_request->upiu_req.uc, UIC_CMD_SIZE);
125 ret = ufshcd_send_uic_cmd(hba, &uc);
126 if (ret)
127 dev_err(hba->dev,
128 "send uic cmd: error code %d\n", ret);
129
130 memcpy(&bsg_reply->upiu_rsp.uc, &uc, UIC_CMD_SIZE);
131
132 break;
133 default:
134 ret = -ENOTSUPP;
135 dev_err(hba->dev, "unsupported msgcode 0x%x\n", msgcode);
136
137 break;
138 }
139
140 pm_runtime_put_sync(hba->dev);
141
142 if (!desc_buff)
143 goto out;
144
145 if (desc_op == UPIU_QUERY_OPCODE_READ_DESC && desc_len)
146 bsg_reply->reply_payload_rcv_len =
147 sg_copy_from_buffer(job->request_payload.sg_list,
148 job->request_payload.sg_cnt,
149 desc_buff, desc_len);
150
151 kfree(desc_buff);
152
153 out:
154 bsg_reply->result = ret;
155 job->reply_len = sizeof(struct ufs_bsg_reply);
156
157 if (ret == 0)
158 bsg_job_done(job, ret, bsg_reply->reply_payload_rcv_len);
159
160 return ret;
161 }
162
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164
165
166
167
168 void ufs_bsg_remove(struct ufs_hba *hba)
169 {
170 struct device *bsg_dev = &hba->bsg_dev;
171
172 if (!hba->bsg_queue)
173 return;
174
175 bsg_remove_queue(hba->bsg_queue);
176
177 device_del(bsg_dev);
178 put_device(bsg_dev);
179 }
180
181 static inline void ufs_bsg_node_release(struct device *dev)
182 {
183 put_device(dev->parent);
184 }
185
186
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188
189
190
191
192 int ufs_bsg_probe(struct ufs_hba *hba)
193 {
194 struct device *bsg_dev = &hba->bsg_dev;
195 struct Scsi_Host *shost = hba->host;
196 struct device *parent = &shost->shost_gendev;
197 struct request_queue *q;
198 int ret;
199
200 device_initialize(bsg_dev);
201
202 bsg_dev->parent = get_device(parent);
203 bsg_dev->release = ufs_bsg_node_release;
204
205 dev_set_name(bsg_dev, "ufs-bsg%u", shost->host_no);
206
207 ret = device_add(bsg_dev);
208 if (ret)
209 goto out;
210
211 q = bsg_setup_queue(bsg_dev, dev_name(bsg_dev), ufs_bsg_request, NULL, 0);
212 if (IS_ERR(q)) {
213 ret = PTR_ERR(q);
214 goto out;
215 }
216
217 hba->bsg_queue = q;
218
219 return 0;
220
221 out:
222 dev_err(bsg_dev, "fail to initialize a bsg dev %d\n", shost->host_no);
223 put_device(bsg_dev);
224 return ret;
225 }