1 /*
2 * Copyright (C) 2003-2008 Takahiro Hirofuchi
3 *
4 * This is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
17 * USA.
18 */
19
20 #include <linux/string.h>
21 #include <linux/module.h>
22
23 #include "usbip_common.h"
24 #include "stub.h"
25
26 #define DRIVER_AUTHOR "Takahiro Hirofuchi"
27 #define DRIVER_DESC "USB/IP Host Driver"
28
29 struct kmem_cache *stub_priv_cache;
30 /*
31 * busid_tables defines matching busids that usbip can grab. A user can change
32 * dynamically what device is locally used and what device is exported to a
33 * remote host.
34 */
35 #define MAX_BUSID 16
36 static struct bus_id_priv busid_table[MAX_BUSID];
37 static spinlock_t busid_table_lock;
38
init_busid_table(void)39 static void init_busid_table(void)
40 {
41 int i;
42
43 memset(busid_table, 0, sizeof(busid_table));
44 for (i = 0; i < MAX_BUSID; i++)
45 busid_table[i].status = STUB_BUSID_OTHER;
46
47 spin_lock_init(&busid_table_lock);
48 }
49
50 /*
51 * Find the index of the busid by name.
52 * Must be called with busid_table_lock held.
53 */
get_busid_idx(const char * busid)54 static int get_busid_idx(const char *busid)
55 {
56 int i;
57 int idx = -1;
58
59 for (i = 0; i < MAX_BUSID; i++)
60 if (busid_table[i].name[0])
61 if (!strncmp(busid_table[i].name, busid, BUSID_SIZE)) {
62 idx = i;
63 break;
64 }
65 return idx;
66 }
67
get_busid_priv(const char * busid)68 struct bus_id_priv *get_busid_priv(const char *busid)
69 {
70 int idx;
71 struct bus_id_priv *bid = NULL;
72
73 spin_lock(&busid_table_lock);
74 idx = get_busid_idx(busid);
75 if (idx >= 0)
76 bid = &(busid_table[idx]);
77 spin_unlock(&busid_table_lock);
78
79 return bid;
80 }
81
add_match_busid(char * busid)82 static int add_match_busid(char *busid)
83 {
84 int i;
85 int ret = -1;
86
87 spin_lock(&busid_table_lock);
88 /* already registered? */
89 if (get_busid_idx(busid) >= 0) {
90 ret = 0;
91 goto out;
92 }
93
94 for (i = 0; i < MAX_BUSID; i++)
95 if (!busid_table[i].name[0]) {
96 strncpy(busid_table[i].name, busid, BUSID_SIZE);
97 if ((busid_table[i].status != STUB_BUSID_ALLOC) &&
98 (busid_table[i].status != STUB_BUSID_REMOV))
99 busid_table[i].status = STUB_BUSID_ADDED;
100 ret = 0;
101 break;
102 }
103
104 out:
105 spin_unlock(&busid_table_lock);
106
107 return ret;
108 }
109
del_match_busid(char * busid)110 int del_match_busid(char *busid)
111 {
112 int idx;
113 int ret = -1;
114
115 spin_lock(&busid_table_lock);
116 idx = get_busid_idx(busid);
117 if (idx < 0)
118 goto out;
119
120 /* found */
121 ret = 0;
122
123 if (busid_table[idx].status == STUB_BUSID_OTHER)
124 memset(busid_table[idx].name, 0, BUSID_SIZE);
125
126 if ((busid_table[idx].status != STUB_BUSID_OTHER) &&
127 (busid_table[idx].status != STUB_BUSID_ADDED))
128 busid_table[idx].status = STUB_BUSID_REMOV;
129
130 out:
131 spin_unlock(&busid_table_lock);
132
133 return ret;
134 }
135
show_match_busid(struct device_driver * drv,char * buf)136 static ssize_t show_match_busid(struct device_driver *drv, char *buf)
137 {
138 int i;
139 char *out = buf;
140
141 spin_lock(&busid_table_lock);
142 for (i = 0; i < MAX_BUSID; i++)
143 if (busid_table[i].name[0])
144 out += sprintf(out, "%s ", busid_table[i].name);
145 spin_unlock(&busid_table_lock);
146 out += sprintf(out, "\n");
147
148 return out - buf;
149 }
150
store_match_busid(struct device_driver * dev,const char * buf,size_t count)151 static ssize_t store_match_busid(struct device_driver *dev, const char *buf,
152 size_t count)
153 {
154 int len;
155 char busid[BUSID_SIZE];
156
157 if (count < 5)
158 return -EINVAL;
159
160 /* strnlen() does not include \0 */
161 len = strnlen(buf + 4, BUSID_SIZE);
162
163 /* busid needs to include \0 termination */
164 if (!(len < BUSID_SIZE))
165 return -EINVAL;
166
167 strncpy(busid, buf + 4, BUSID_SIZE);
168
169 if (!strncmp(buf, "add ", 4)) {
170 if (add_match_busid(busid) < 0) {
171 return -ENOMEM;
172 } else {
173 pr_debug("add busid %s\n", busid);
174 return count;
175 }
176 } else if (!strncmp(buf, "del ", 4)) {
177 if (del_match_busid(busid) < 0) {
178 return -ENODEV;
179 } else {
180 pr_debug("del busid %s\n", busid);
181 return count;
182 }
183 } else {
184 return -EINVAL;
185 }
186 }
187 static DRIVER_ATTR(match_busid, S_IRUSR | S_IWUSR, show_match_busid,
188 store_match_busid);
189
stub_priv_pop_from_listhead(struct list_head * listhead)190 static struct stub_priv *stub_priv_pop_from_listhead(struct list_head *listhead)
191 {
192 struct stub_priv *priv, *tmp;
193
194 list_for_each_entry_safe(priv, tmp, listhead, list) {
195 list_del(&priv->list);
196 return priv;
197 }
198
199 return NULL;
200 }
201
stub_priv_pop(struct stub_device * sdev)202 static struct stub_priv *stub_priv_pop(struct stub_device *sdev)
203 {
204 unsigned long flags;
205 struct stub_priv *priv;
206
207 spin_lock_irqsave(&sdev->priv_lock, flags);
208
209 priv = stub_priv_pop_from_listhead(&sdev->priv_init);
210 if (priv)
211 goto done;
212
213 priv = stub_priv_pop_from_listhead(&sdev->priv_tx);
214 if (priv)
215 goto done;
216
217 priv = stub_priv_pop_from_listhead(&sdev->priv_free);
218
219 done:
220 spin_unlock_irqrestore(&sdev->priv_lock, flags);
221
222 return priv;
223 }
224
stub_device_cleanup_urbs(struct stub_device * sdev)225 void stub_device_cleanup_urbs(struct stub_device *sdev)
226 {
227 struct stub_priv *priv;
228 struct urb *urb;
229
230 dev_dbg(&sdev->udev->dev, "free sdev %p\n", sdev);
231
232 while ((priv = stub_priv_pop(sdev))) {
233 urb = priv->urb;
234 dev_dbg(&sdev->udev->dev, "free urb %p\n", urb);
235 usb_kill_urb(urb);
236
237 kmem_cache_free(stub_priv_cache, priv);
238
239 kfree(urb->transfer_buffer);
240 kfree(urb->setup_packet);
241 usb_free_urb(urb);
242 }
243 }
244
usbip_host_init(void)245 static int __init usbip_host_init(void)
246 {
247 int ret;
248
249 init_busid_table();
250
251 stub_priv_cache = KMEM_CACHE(stub_priv, SLAB_HWCACHE_ALIGN);
252 if (!stub_priv_cache) {
253 pr_err("kmem_cache_create failed\n");
254 return -ENOMEM;
255 }
256
257 ret = usb_register(&stub_driver);
258 if (ret < 0) {
259 pr_err("usb_register failed %d\n", ret);
260 goto err_usb_register;
261 }
262
263 ret = driver_create_file(&stub_driver.drvwrap.driver,
264 &driver_attr_match_busid);
265 if (ret < 0) {
266 pr_err("driver_create_file failed\n");
267 goto err_create_file;
268 }
269
270 pr_info(DRIVER_DESC " v" USBIP_VERSION "\n");
271 return ret;
272
273 err_create_file:
274 usb_deregister(&stub_driver);
275 err_usb_register:
276 kmem_cache_destroy(stub_priv_cache);
277 return ret;
278 }
279
usbip_host_exit(void)280 static void __exit usbip_host_exit(void)
281 {
282 driver_remove_file(&stub_driver.drvwrap.driver,
283 &driver_attr_match_busid);
284
285 /*
286 * deregister() calls stub_disconnect() for all devices. Device
287 * specific data is cleared in stub_disconnect().
288 */
289 usb_deregister(&stub_driver);
290
291 kmem_cache_destroy(stub_priv_cache);
292 }
293
294 module_init(usbip_host_init);
295 module_exit(usbip_host_exit);
296
297 MODULE_AUTHOR(DRIVER_AUTHOR);
298 MODULE_DESCRIPTION(DRIVER_DESC);
299 MODULE_LICENSE("GPL");
300 MODULE_VERSION(USBIP_VERSION);
301