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Commit | Line | Data |
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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 | ||
5a0e3ad6 | 13 | #include <linux/slab.h> |
45633fdc CS |
14 | #include <linux/types.h> |
15 | #include <linux/miscdevice.h> | |
9e2ab1fa | 16 | #include <asm/compat.h> |
45633fdc CS |
17 | #include <asm/ccwdev.h> |
18 | #include "zfcp_def.h" | |
19 | #include "zfcp_ext.h" | |
20 | #include "zfcp_fsf.h" | |
21 | ||
22 | #define ZFCP_CFDC_CMND_DOWNLOAD_NORMAL 0x00010001 | |
23 | #define ZFCP_CFDC_CMND_DOWNLOAD_FORCE 0x00010101 | |
24 | #define ZFCP_CFDC_CMND_FULL_ACCESS 0x00000201 | |
25 | #define ZFCP_CFDC_CMND_RESTRICTED_ACCESS 0x00000401 | |
26 | #define ZFCP_CFDC_CMND_UPLOAD 0x00010002 | |
27 | ||
28 | #define ZFCP_CFDC_DOWNLOAD 0x00000001 | |
29 | #define ZFCP_CFDC_UPLOAD 0x00000002 | |
30 | #define ZFCP_CFDC_WITH_CONTROL_FILE 0x00010000 | |
31 | ||
32 | #define ZFCP_CFDC_IOC_MAGIC 0xDD | |
33 | #define ZFCP_CFDC_IOC \ | |
34 | _IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_data) | |
35 | ||
36 | /** | |
37 | * struct zfcp_cfdc_data - data for ioctl cfdc interface | |
38 | * @signature: request signature | |
39 | * @devno: FCP adapter device number | |
40 | * @command: command code | |
41 | * @fsf_status: returns status of FSF command to userspace | |
42 | * @fsf_status_qual: returned to userspace | |
43 | * @payloads: access conflicts list | |
44 | * @control_file: access control table | |
45 | */ | |
46 | struct zfcp_cfdc_data { | |
47 | u32 signature; | |
48 | u32 devno; | |
49 | u32 command; | |
50 | u32 fsf_status; | |
51 | u8 fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE]; | |
52 | u8 payloads[256]; | |
53 | u8 control_file[0]; | |
54 | }; | |
55 | ||
56 | static int zfcp_cfdc_copy_from_user(struct scatterlist *sg, | |
57 | void __user *user_buffer) | |
58 | { | |
59 | unsigned int length; | |
60 | unsigned int size = ZFCP_CFDC_MAX_SIZE; | |
61 | ||
62 | while (size) { | |
63 | length = min((unsigned int)size, sg->length); | |
64 | if (copy_from_user(sg_virt(sg++), user_buffer, length)) | |
65 | return -EFAULT; | |
66 | user_buffer += length; | |
67 | size -= length; | |
68 | } | |
69 | return 0; | |
70 | } | |
71 | ||
72 | static int zfcp_cfdc_copy_to_user(void __user *user_buffer, | |
73 | struct scatterlist *sg) | |
74 | { | |
75 | unsigned int length; | |
76 | unsigned int size = ZFCP_CFDC_MAX_SIZE; | |
77 | ||
78 | while (size) { | |
79 | length = min((unsigned int) size, sg->length); | |
80 | if (copy_to_user(user_buffer, sg_virt(sg++), length)) | |
81 | return -EFAULT; | |
82 | user_buffer += length; | |
83 | size -= length; | |
84 | } | |
85 | return 0; | |
86 | } | |
87 | ||
88 | static struct zfcp_adapter *zfcp_cfdc_get_adapter(u32 devno) | |
89 | { | |
b228af02 | 90 | char busid[9]; |
de3dc572 SS |
91 | struct ccw_device *cdev; |
92 | struct zfcp_adapter *adapter; | |
c5afd81e | 93 | |
b228af02 | 94 | snprintf(busid, sizeof(busid), "0.0.%04x", devno); |
de3dc572 SS |
95 | cdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid); |
96 | if (!cdev) | |
97 | return NULL; | |
98 | ||
99 | adapter = zfcp_ccw_adapter_by_cdev(cdev); | |
100 | ||
101 | put_device(&cdev->dev); | |
c5afd81e | 102 | return adapter; |
45633fdc CS |
103 | } |
104 | ||
105 | static int zfcp_cfdc_set_fsf(struct zfcp_fsf_cfdc *fsf_cfdc, int command) | |
106 | { | |
107 | switch (command) { | |
108 | case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL: | |
109 | fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE; | |
110 | fsf_cfdc->option = FSF_CFDC_OPTION_NORMAL_MODE; | |
111 | break; | |
112 | case ZFCP_CFDC_CMND_DOWNLOAD_FORCE: | |
113 | fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE; | |
114 | fsf_cfdc->option = FSF_CFDC_OPTION_FORCE; | |
115 | break; | |
116 | case ZFCP_CFDC_CMND_FULL_ACCESS: | |
117 | fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE; | |
118 | fsf_cfdc->option = FSF_CFDC_OPTION_FULL_ACCESS; | |
119 | break; | |
120 | case ZFCP_CFDC_CMND_RESTRICTED_ACCESS: | |
121 | fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE; | |
122 | fsf_cfdc->option = FSF_CFDC_OPTION_RESTRICTED_ACCESS; | |
123 | break; | |
124 | case ZFCP_CFDC_CMND_UPLOAD: | |
125 | fsf_cfdc->command = FSF_QTCB_UPLOAD_CONTROL_FILE; | |
126 | fsf_cfdc->option = 0; | |
127 | break; | |
128 | default: | |
129 | return -EINVAL; | |
130 | } | |
131 | ||
132 | return 0; | |
133 | } | |
134 | ||
135 | static int zfcp_cfdc_sg_setup(int command, struct scatterlist *sg, | |
136 | u8 __user *control_file) | |
137 | { | |
138 | int retval; | |
139 | retval = zfcp_sg_setup_table(sg, ZFCP_CFDC_PAGES); | |
140 | if (retval) | |
141 | return retval; | |
142 | ||
143 | sg[ZFCP_CFDC_PAGES - 1].length = ZFCP_CFDC_MAX_SIZE % PAGE_SIZE; | |
144 | ||
145 | if (command & ZFCP_CFDC_WITH_CONTROL_FILE && | |
146 | command & ZFCP_CFDC_DOWNLOAD) { | |
147 | retval = zfcp_cfdc_copy_from_user(sg, control_file); | |
148 | if (retval) { | |
149 | zfcp_sg_free_table(sg, ZFCP_CFDC_PAGES); | |
150 | return -EFAULT; | |
151 | } | |
152 | } | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
157 | static void zfcp_cfdc_req_to_sense(struct zfcp_cfdc_data *data, | |
158 | struct zfcp_fsf_req *req) | |
159 | { | |
160 | data->fsf_status = req->qtcb->header.fsf_status; | |
161 | memcpy(&data->fsf_status_qual, &req->qtcb->header.fsf_status_qual, | |
162 | sizeof(union fsf_status_qual)); | |
163 | memcpy(&data->payloads, &req->qtcb->bottom.support.els, | |
164 | sizeof(req->qtcb->bottom.support.els)); | |
165 | } | |
166 | ||
167 | static long zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command, | |
9e2ab1fa | 168 | unsigned long arg) |
45633fdc CS |
169 | { |
170 | struct zfcp_cfdc_data *data; | |
171 | struct zfcp_cfdc_data __user *data_user; | |
172 | struct zfcp_adapter *adapter; | |
173 | struct zfcp_fsf_req *req; | |
174 | struct zfcp_fsf_cfdc *fsf_cfdc; | |
175 | int retval; | |
176 | ||
177 | if (command != ZFCP_CFDC_IOC) | |
178 | return -ENOTTY; | |
179 | ||
9e2ab1fa HC |
180 | if (is_compat_task()) |
181 | data_user = compat_ptr(arg); | |
182 | else | |
183 | data_user = (void __user *)arg; | |
184 | ||
45633fdc CS |
185 | if (!data_user) |
186 | return -EINVAL; | |
187 | ||
188 | fsf_cfdc = kmalloc(sizeof(struct zfcp_fsf_cfdc), GFP_KERNEL); | |
189 | if (!fsf_cfdc) | |
190 | return -ENOMEM; | |
191 | ||
192 | data = kmalloc(sizeof(struct zfcp_cfdc_data), GFP_KERNEL); | |
193 | if (!data) { | |
194 | retval = -ENOMEM; | |
195 | goto no_mem_sense; | |
196 | } | |
197 | ||
198 | retval = copy_from_user(data, data_user, sizeof(*data)); | |
199 | if (retval) { | |
200 | retval = -EFAULT; | |
201 | goto free_buffer; | |
202 | } | |
203 | ||
204 | if (data->signature != 0xCFDCACDF) { | |
205 | retval = -EINVAL; | |
206 | goto free_buffer; | |
207 | } | |
208 | ||
209 | retval = zfcp_cfdc_set_fsf(fsf_cfdc, data->command); | |
210 | ||
211 | adapter = zfcp_cfdc_get_adapter(data->devno); | |
212 | if (!adapter) { | |
213 | retval = -ENXIO; | |
214 | goto free_buffer; | |
215 | } | |
216 | ||
217 | retval = zfcp_cfdc_sg_setup(data->command, fsf_cfdc->sg, | |
218 | data_user->control_file); | |
219 | if (retval) | |
220 | goto adapter_put; | |
221 | req = zfcp_fsf_control_file(adapter, fsf_cfdc); | |
222 | if (IS_ERR(req)) { | |
223 | retval = PTR_ERR(req); | |
224 | goto free_sg; | |
225 | } | |
226 | ||
227 | if (req->status & ZFCP_STATUS_FSFREQ_ERROR) { | |
228 | retval = -ENXIO; | |
229 | goto free_fsf; | |
230 | } | |
231 | ||
232 | zfcp_cfdc_req_to_sense(data, req); | |
233 | retval = copy_to_user(data_user, data, sizeof(*data_user)); | |
234 | if (retval) { | |
235 | retval = -EFAULT; | |
236 | goto free_fsf; | |
237 | } | |
238 | ||
239 | if (data->command & ZFCP_CFDC_UPLOAD) | |
240 | retval = zfcp_cfdc_copy_to_user(&data_user->control_file, | |
241 | fsf_cfdc->sg); | |
242 | ||
243 | free_fsf: | |
244 | zfcp_fsf_req_free(req); | |
245 | free_sg: | |
246 | zfcp_sg_free_table(fsf_cfdc->sg, ZFCP_CFDC_PAGES); | |
247 | adapter_put: | |
de3dc572 | 248 | zfcp_ccw_adapter_put(adapter); |
45633fdc CS |
249 | free_buffer: |
250 | kfree(data); | |
251 | no_mem_sense: | |
252 | kfree(fsf_cfdc); | |
253 | return retval; | |
254 | } | |
255 | ||
256 | static const struct file_operations zfcp_cfdc_fops = { | |
257 | .unlocked_ioctl = zfcp_cfdc_dev_ioctl, | |
258 | #ifdef CONFIG_COMPAT | |
259 | .compat_ioctl = zfcp_cfdc_dev_ioctl | |
260 | #endif | |
261 | }; | |
262 | ||
263 | struct miscdevice zfcp_cfdc_misc = { | |
264 | .minor = MISC_DYNAMIC_MINOR, | |
265 | .name = "zfcp_cfdc", | |
266 | .fops = &zfcp_cfdc_fops, | |
267 | }; |