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45633fdc CS |
1 | /* |
2 | * zfcp device driver | |
3 | * | |
4 | * Userspace interface for accessing the | |
5 | * Access Control Lists / Control File Data Channel | |
6 | * | |
3869bb6e | 7 | * Copyright IBM Corporation 2008, 2009 |
45633fdc CS |
8 | */ |
9 | ||
ecf39d42 CS |
10 | #define KMSG_COMPONENT "zfcp" |
11 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
12 | ||
45633fdc CS |
13 | #include <linux/types.h> |
14 | #include <linux/miscdevice.h> | |
15 | #include <asm/ccwdev.h> | |
16 | #include "zfcp_def.h" | |
17 | #include "zfcp_ext.h" | |
18 | #include "zfcp_fsf.h" | |
19 | ||
20 | #define ZFCP_CFDC_CMND_DOWNLOAD_NORMAL 0x00010001 | |
21 | #define ZFCP_CFDC_CMND_DOWNLOAD_FORCE 0x00010101 | |
22 | #define ZFCP_CFDC_CMND_FULL_ACCESS 0x00000201 | |
23 | #define ZFCP_CFDC_CMND_RESTRICTED_ACCESS 0x00000401 | |
24 | #define ZFCP_CFDC_CMND_UPLOAD 0x00010002 | |
25 | ||
26 | #define ZFCP_CFDC_DOWNLOAD 0x00000001 | |
27 | #define ZFCP_CFDC_UPLOAD 0x00000002 | |
28 | #define ZFCP_CFDC_WITH_CONTROL_FILE 0x00010000 | |
29 | ||
30 | #define ZFCP_CFDC_IOC_MAGIC 0xDD | |
31 | #define ZFCP_CFDC_IOC \ | |
32 | _IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_data) | |
33 | ||
34 | /** | |
35 | * struct zfcp_cfdc_data - data for ioctl cfdc interface | |
36 | * @signature: request signature | |
37 | * @devno: FCP adapter device number | |
38 | * @command: command code | |
39 | * @fsf_status: returns status of FSF command to userspace | |
40 | * @fsf_status_qual: returned to userspace | |
41 | * @payloads: access conflicts list | |
42 | * @control_file: access control table | |
43 | */ | |
44 | struct zfcp_cfdc_data { | |
45 | u32 signature; | |
46 | u32 devno; | |
47 | u32 command; | |
48 | u32 fsf_status; | |
49 | u8 fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE]; | |
50 | u8 payloads[256]; | |
51 | u8 control_file[0]; | |
52 | }; | |
53 | ||
54 | static int zfcp_cfdc_copy_from_user(struct scatterlist *sg, | |
55 | void __user *user_buffer) | |
56 | { | |
57 | unsigned int length; | |
58 | unsigned int size = ZFCP_CFDC_MAX_SIZE; | |
59 | ||
60 | while (size) { | |
61 | length = min((unsigned int)size, sg->length); | |
62 | if (copy_from_user(sg_virt(sg++), user_buffer, length)) | |
63 | return -EFAULT; | |
64 | user_buffer += length; | |
65 | size -= length; | |
66 | } | |
67 | return 0; | |
68 | } | |
69 | ||
70 | static int zfcp_cfdc_copy_to_user(void __user *user_buffer, | |
71 | struct scatterlist *sg) | |
72 | { | |
73 | unsigned int length; | |
74 | unsigned int size = ZFCP_CFDC_MAX_SIZE; | |
75 | ||
76 | while (size) { | |
77 | length = min((unsigned int) size, sg->length); | |
78 | if (copy_to_user(user_buffer, sg_virt(sg++), length)) | |
79 | return -EFAULT; | |
80 | user_buffer += length; | |
81 | size -= length; | |
82 | } | |
83 | return 0; | |
84 | } | |
85 | ||
86 | static struct zfcp_adapter *zfcp_cfdc_get_adapter(u32 devno) | |
87 | { | |
b228af02 CS |
88 | char busid[9]; |
89 | snprintf(busid, sizeof(busid), "0.0.%04x", devno); | |
90 | return zfcp_get_adapter_by_busid(busid); | |
45633fdc CS |
91 | } |
92 | ||
93 | static int zfcp_cfdc_set_fsf(struct zfcp_fsf_cfdc *fsf_cfdc, int command) | |
94 | { | |
95 | switch (command) { | |
96 | case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL: | |
97 | fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE; | |
98 | fsf_cfdc->option = FSF_CFDC_OPTION_NORMAL_MODE; | |
99 | break; | |
100 | case ZFCP_CFDC_CMND_DOWNLOAD_FORCE: | |
101 | fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE; | |
102 | fsf_cfdc->option = FSF_CFDC_OPTION_FORCE; | |
103 | break; | |
104 | case ZFCP_CFDC_CMND_FULL_ACCESS: | |
105 | fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE; | |
106 | fsf_cfdc->option = FSF_CFDC_OPTION_FULL_ACCESS; | |
107 | break; | |
108 | case ZFCP_CFDC_CMND_RESTRICTED_ACCESS: | |
109 | fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE; | |
110 | fsf_cfdc->option = FSF_CFDC_OPTION_RESTRICTED_ACCESS; | |
111 | break; | |
112 | case ZFCP_CFDC_CMND_UPLOAD: | |
113 | fsf_cfdc->command = FSF_QTCB_UPLOAD_CONTROL_FILE; | |
114 | fsf_cfdc->option = 0; | |
115 | break; | |
116 | default: | |
117 | return -EINVAL; | |
118 | } | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | static int zfcp_cfdc_sg_setup(int command, struct scatterlist *sg, | |
124 | u8 __user *control_file) | |
125 | { | |
126 | int retval; | |
127 | retval = zfcp_sg_setup_table(sg, ZFCP_CFDC_PAGES); | |
128 | if (retval) | |
129 | return retval; | |
130 | ||
131 | sg[ZFCP_CFDC_PAGES - 1].length = ZFCP_CFDC_MAX_SIZE % PAGE_SIZE; | |
132 | ||
133 | if (command & ZFCP_CFDC_WITH_CONTROL_FILE && | |
134 | command & ZFCP_CFDC_DOWNLOAD) { | |
135 | retval = zfcp_cfdc_copy_from_user(sg, control_file); | |
136 | if (retval) { | |
137 | zfcp_sg_free_table(sg, ZFCP_CFDC_PAGES); | |
138 | return -EFAULT; | |
139 | } | |
140 | } | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
145 | static void zfcp_cfdc_req_to_sense(struct zfcp_cfdc_data *data, | |
146 | struct zfcp_fsf_req *req) | |
147 | { | |
148 | data->fsf_status = req->qtcb->header.fsf_status; | |
149 | memcpy(&data->fsf_status_qual, &req->qtcb->header.fsf_status_qual, | |
150 | sizeof(union fsf_status_qual)); | |
151 | memcpy(&data->payloads, &req->qtcb->bottom.support.els, | |
152 | sizeof(req->qtcb->bottom.support.els)); | |
153 | } | |
154 | ||
155 | static long zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command, | |
156 | unsigned long buffer) | |
157 | { | |
158 | struct zfcp_cfdc_data *data; | |
159 | struct zfcp_cfdc_data __user *data_user; | |
160 | struct zfcp_adapter *adapter; | |
161 | struct zfcp_fsf_req *req; | |
162 | struct zfcp_fsf_cfdc *fsf_cfdc; | |
163 | int retval; | |
164 | ||
165 | if (command != ZFCP_CFDC_IOC) | |
166 | return -ENOTTY; | |
167 | ||
168 | data_user = (void __user *) buffer; | |
169 | if (!data_user) | |
170 | return -EINVAL; | |
171 | ||
172 | fsf_cfdc = kmalloc(sizeof(struct zfcp_fsf_cfdc), GFP_KERNEL); | |
173 | if (!fsf_cfdc) | |
174 | return -ENOMEM; | |
175 | ||
176 | data = kmalloc(sizeof(struct zfcp_cfdc_data), GFP_KERNEL); | |
177 | if (!data) { | |
178 | retval = -ENOMEM; | |
179 | goto no_mem_sense; | |
180 | } | |
181 | ||
182 | retval = copy_from_user(data, data_user, sizeof(*data)); | |
183 | if (retval) { | |
184 | retval = -EFAULT; | |
185 | goto free_buffer; | |
186 | } | |
187 | ||
188 | if (data->signature != 0xCFDCACDF) { | |
189 | retval = -EINVAL; | |
190 | goto free_buffer; | |
191 | } | |
192 | ||
193 | retval = zfcp_cfdc_set_fsf(fsf_cfdc, data->command); | |
194 | ||
195 | adapter = zfcp_cfdc_get_adapter(data->devno); | |
196 | if (!adapter) { | |
197 | retval = -ENXIO; | |
198 | goto free_buffer; | |
199 | } | |
3869bb6e | 200 | zfcp_adapter_get(adapter); |
45633fdc CS |
201 | |
202 | retval = zfcp_cfdc_sg_setup(data->command, fsf_cfdc->sg, | |
203 | data_user->control_file); | |
204 | if (retval) | |
205 | goto adapter_put; | |
206 | req = zfcp_fsf_control_file(adapter, fsf_cfdc); | |
207 | if (IS_ERR(req)) { | |
208 | retval = PTR_ERR(req); | |
209 | goto free_sg; | |
210 | } | |
211 | ||
212 | if (req->status & ZFCP_STATUS_FSFREQ_ERROR) { | |
213 | retval = -ENXIO; | |
214 | goto free_fsf; | |
215 | } | |
216 | ||
217 | zfcp_cfdc_req_to_sense(data, req); | |
218 | retval = copy_to_user(data_user, data, sizeof(*data_user)); | |
219 | if (retval) { | |
220 | retval = -EFAULT; | |
221 | goto free_fsf; | |
222 | } | |
223 | ||
224 | if (data->command & ZFCP_CFDC_UPLOAD) | |
225 | retval = zfcp_cfdc_copy_to_user(&data_user->control_file, | |
226 | fsf_cfdc->sg); | |
227 | ||
228 | free_fsf: | |
229 | zfcp_fsf_req_free(req); | |
230 | free_sg: | |
231 | zfcp_sg_free_table(fsf_cfdc->sg, ZFCP_CFDC_PAGES); | |
232 | adapter_put: | |
233 | zfcp_adapter_put(adapter); | |
234 | free_buffer: | |
235 | kfree(data); | |
236 | no_mem_sense: | |
237 | kfree(fsf_cfdc); | |
238 | return retval; | |
239 | } | |
240 | ||
241 | static const struct file_operations zfcp_cfdc_fops = { | |
242 | .unlocked_ioctl = zfcp_cfdc_dev_ioctl, | |
243 | #ifdef CONFIG_COMPAT | |
244 | .compat_ioctl = zfcp_cfdc_dev_ioctl | |
245 | #endif | |
246 | }; | |
247 | ||
248 | struct miscdevice zfcp_cfdc_misc = { | |
249 | .minor = MISC_DYNAMIC_MINOR, | |
250 | .name = "zfcp_cfdc", | |
251 | .fops = &zfcp_cfdc_fops, | |
252 | }; |