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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 | * | |
7 | * Copyright IBM Corporation 2008 | |
8 | */ | |
9 | ||
10 | #include <linux/types.h> | |
11 | #include <linux/miscdevice.h> | |
12 | #include <asm/ccwdev.h> | |
13 | #include "zfcp_def.h" | |
14 | #include "zfcp_ext.h" | |
15 | #include "zfcp_fsf.h" | |
16 | ||
17 | #define ZFCP_CFDC_CMND_DOWNLOAD_NORMAL 0x00010001 | |
18 | #define ZFCP_CFDC_CMND_DOWNLOAD_FORCE 0x00010101 | |
19 | #define ZFCP_CFDC_CMND_FULL_ACCESS 0x00000201 | |
20 | #define ZFCP_CFDC_CMND_RESTRICTED_ACCESS 0x00000401 | |
21 | #define ZFCP_CFDC_CMND_UPLOAD 0x00010002 | |
22 | ||
23 | #define ZFCP_CFDC_DOWNLOAD 0x00000001 | |
24 | #define ZFCP_CFDC_UPLOAD 0x00000002 | |
25 | #define ZFCP_CFDC_WITH_CONTROL_FILE 0x00010000 | |
26 | ||
27 | #define ZFCP_CFDC_IOC_MAGIC 0xDD | |
28 | #define ZFCP_CFDC_IOC \ | |
29 | _IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_data) | |
30 | ||
31 | /** | |
32 | * struct zfcp_cfdc_data - data for ioctl cfdc interface | |
33 | * @signature: request signature | |
34 | * @devno: FCP adapter device number | |
35 | * @command: command code | |
36 | * @fsf_status: returns status of FSF command to userspace | |
37 | * @fsf_status_qual: returned to userspace | |
38 | * @payloads: access conflicts list | |
39 | * @control_file: access control table | |
40 | */ | |
41 | struct zfcp_cfdc_data { | |
42 | u32 signature; | |
43 | u32 devno; | |
44 | u32 command; | |
45 | u32 fsf_status; | |
46 | u8 fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE]; | |
47 | u8 payloads[256]; | |
48 | u8 control_file[0]; | |
49 | }; | |
50 | ||
51 | static int zfcp_cfdc_copy_from_user(struct scatterlist *sg, | |
52 | void __user *user_buffer) | |
53 | { | |
54 | unsigned int length; | |
55 | unsigned int size = ZFCP_CFDC_MAX_SIZE; | |
56 | ||
57 | while (size) { | |
58 | length = min((unsigned int)size, sg->length); | |
59 | if (copy_from_user(sg_virt(sg++), user_buffer, length)) | |
60 | return -EFAULT; | |
61 | user_buffer += length; | |
62 | size -= length; | |
63 | } | |
64 | return 0; | |
65 | } | |
66 | ||
67 | static int zfcp_cfdc_copy_to_user(void __user *user_buffer, | |
68 | struct scatterlist *sg) | |
69 | { | |
70 | unsigned int length; | |
71 | unsigned int size = ZFCP_CFDC_MAX_SIZE; | |
72 | ||
73 | while (size) { | |
74 | length = min((unsigned int) size, sg->length); | |
75 | if (copy_to_user(user_buffer, sg_virt(sg++), length)) | |
76 | return -EFAULT; | |
77 | user_buffer += length; | |
78 | size -= length; | |
79 | } | |
80 | return 0; | |
81 | } | |
82 | ||
83 | static struct zfcp_adapter *zfcp_cfdc_get_adapter(u32 devno) | |
84 | { | |
85 | struct zfcp_adapter *adapter = NULL, *cur_adapter; | |
86 | struct ccw_dev_id dev_id; | |
87 | ||
88 | read_lock_irq(&zfcp_data.config_lock); | |
89 | list_for_each_entry(cur_adapter, &zfcp_data.adapter_list_head, list) { | |
90 | ccw_device_get_id(cur_adapter->ccw_device, &dev_id); | |
91 | if (dev_id.devno == devno) { | |
92 | adapter = cur_adapter; | |
93 | zfcp_adapter_get(adapter); | |
94 | break; | |
95 | } | |
96 | } | |
97 | read_unlock_irq(&zfcp_data.config_lock); | |
98 | return adapter; | |
99 | } | |
100 | ||
101 | static int zfcp_cfdc_set_fsf(struct zfcp_fsf_cfdc *fsf_cfdc, int command) | |
102 | { | |
103 | switch (command) { | |
104 | case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL: | |
105 | fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE; | |
106 | fsf_cfdc->option = FSF_CFDC_OPTION_NORMAL_MODE; | |
107 | break; | |
108 | case ZFCP_CFDC_CMND_DOWNLOAD_FORCE: | |
109 | fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE; | |
110 | fsf_cfdc->option = FSF_CFDC_OPTION_FORCE; | |
111 | break; | |
112 | case ZFCP_CFDC_CMND_FULL_ACCESS: | |
113 | fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE; | |
114 | fsf_cfdc->option = FSF_CFDC_OPTION_FULL_ACCESS; | |
115 | break; | |
116 | case ZFCP_CFDC_CMND_RESTRICTED_ACCESS: | |
117 | fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE; | |
118 | fsf_cfdc->option = FSF_CFDC_OPTION_RESTRICTED_ACCESS; | |
119 | break; | |
120 | case ZFCP_CFDC_CMND_UPLOAD: | |
121 | fsf_cfdc->command = FSF_QTCB_UPLOAD_CONTROL_FILE; | |
122 | fsf_cfdc->option = 0; | |
123 | break; | |
124 | default: | |
125 | return -EINVAL; | |
126 | } | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | static int zfcp_cfdc_sg_setup(int command, struct scatterlist *sg, | |
132 | u8 __user *control_file) | |
133 | { | |
134 | int retval; | |
135 | retval = zfcp_sg_setup_table(sg, ZFCP_CFDC_PAGES); | |
136 | if (retval) | |
137 | return retval; | |
138 | ||
139 | sg[ZFCP_CFDC_PAGES - 1].length = ZFCP_CFDC_MAX_SIZE % PAGE_SIZE; | |
140 | ||
141 | if (command & ZFCP_CFDC_WITH_CONTROL_FILE && | |
142 | command & ZFCP_CFDC_DOWNLOAD) { | |
143 | retval = zfcp_cfdc_copy_from_user(sg, control_file); | |
144 | if (retval) { | |
145 | zfcp_sg_free_table(sg, ZFCP_CFDC_PAGES); | |
146 | return -EFAULT; | |
147 | } | |
148 | } | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | static void zfcp_cfdc_req_to_sense(struct zfcp_cfdc_data *data, | |
154 | struct zfcp_fsf_req *req) | |
155 | { | |
156 | data->fsf_status = req->qtcb->header.fsf_status; | |
157 | memcpy(&data->fsf_status_qual, &req->qtcb->header.fsf_status_qual, | |
158 | sizeof(union fsf_status_qual)); | |
159 | memcpy(&data->payloads, &req->qtcb->bottom.support.els, | |
160 | sizeof(req->qtcb->bottom.support.els)); | |
161 | } | |
162 | ||
163 | static long zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command, | |
164 | unsigned long buffer) | |
165 | { | |
166 | struct zfcp_cfdc_data *data; | |
167 | struct zfcp_cfdc_data __user *data_user; | |
168 | struct zfcp_adapter *adapter; | |
169 | struct zfcp_fsf_req *req; | |
170 | struct zfcp_fsf_cfdc *fsf_cfdc; | |
171 | int retval; | |
172 | ||
173 | if (command != ZFCP_CFDC_IOC) | |
174 | return -ENOTTY; | |
175 | ||
176 | data_user = (void __user *) buffer; | |
177 | if (!data_user) | |
178 | return -EINVAL; | |
179 | ||
180 | fsf_cfdc = kmalloc(sizeof(struct zfcp_fsf_cfdc), GFP_KERNEL); | |
181 | if (!fsf_cfdc) | |
182 | return -ENOMEM; | |
183 | ||
184 | data = kmalloc(sizeof(struct zfcp_cfdc_data), GFP_KERNEL); | |
185 | if (!data) { | |
186 | retval = -ENOMEM; | |
187 | goto no_mem_sense; | |
188 | } | |
189 | ||
190 | retval = copy_from_user(data, data_user, sizeof(*data)); | |
191 | if (retval) { | |
192 | retval = -EFAULT; | |
193 | goto free_buffer; | |
194 | } | |
195 | ||
196 | if (data->signature != 0xCFDCACDF) { | |
197 | retval = -EINVAL; | |
198 | goto free_buffer; | |
199 | } | |
200 | ||
201 | retval = zfcp_cfdc_set_fsf(fsf_cfdc, data->command); | |
202 | ||
203 | adapter = zfcp_cfdc_get_adapter(data->devno); | |
204 | if (!adapter) { | |
205 | retval = -ENXIO; | |
206 | goto free_buffer; | |
207 | } | |
208 | ||
209 | retval = zfcp_cfdc_sg_setup(data->command, fsf_cfdc->sg, | |
210 | data_user->control_file); | |
211 | if (retval) | |
212 | goto adapter_put; | |
213 | req = zfcp_fsf_control_file(adapter, fsf_cfdc); | |
214 | if (IS_ERR(req)) { | |
215 | retval = PTR_ERR(req); | |
216 | goto free_sg; | |
217 | } | |
218 | ||
219 | if (req->status & ZFCP_STATUS_FSFREQ_ERROR) { | |
220 | retval = -ENXIO; | |
221 | goto free_fsf; | |
222 | } | |
223 | ||
224 | zfcp_cfdc_req_to_sense(data, req); | |
225 | retval = copy_to_user(data_user, data, sizeof(*data_user)); | |
226 | if (retval) { | |
227 | retval = -EFAULT; | |
228 | goto free_fsf; | |
229 | } | |
230 | ||
231 | if (data->command & ZFCP_CFDC_UPLOAD) | |
232 | retval = zfcp_cfdc_copy_to_user(&data_user->control_file, | |
233 | fsf_cfdc->sg); | |
234 | ||
235 | free_fsf: | |
236 | zfcp_fsf_req_free(req); | |
237 | free_sg: | |
238 | zfcp_sg_free_table(fsf_cfdc->sg, ZFCP_CFDC_PAGES); | |
239 | adapter_put: | |
240 | zfcp_adapter_put(adapter); | |
241 | free_buffer: | |
242 | kfree(data); | |
243 | no_mem_sense: | |
244 | kfree(fsf_cfdc); | |
245 | return retval; | |
246 | } | |
247 | ||
248 | static const struct file_operations zfcp_cfdc_fops = { | |
249 | .unlocked_ioctl = zfcp_cfdc_dev_ioctl, | |
250 | #ifdef CONFIG_COMPAT | |
251 | .compat_ioctl = zfcp_cfdc_dev_ioctl | |
252 | #endif | |
253 | }; | |
254 | ||
255 | struct miscdevice zfcp_cfdc_misc = { | |
256 | .minor = MISC_DYNAMIC_MINOR, | |
257 | .name = "zfcp_cfdc", | |
258 | .fops = &zfcp_cfdc_fops, | |
259 | }; |