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20#include <linux/string.h>
21#include <linux/module.h>
22#include <linux/device.h>
23
24#include "usbip_common.h"
25#include "stub.h"
26
27#define DRIVER_AUTHOR "Takahiro Hirofuchi"
28#define DRIVER_DESC "USB/IP Host Driver"
29
30struct kmem_cache *stub_priv_cache;
31
32
33
34
35
36#define MAX_BUSID 16
37static struct bus_id_priv busid_table[MAX_BUSID];
38static spinlock_t busid_table_lock;
39
40static void init_busid_table(void)
41{
42
43
44
45
46 memset(busid_table, 0, sizeof(busid_table));
47
48 spin_lock_init(&busid_table_lock);
49}
50
51
52
53
54
55static int get_busid_idx(const char *busid)
56{
57 int i;
58 int idx = -1;
59
60 for (i = 0; i < MAX_BUSID; i++)
61 if (busid_table[i].name[0])
62 if (!strncmp(busid_table[i].name, busid, BUSID_SIZE)) {
63 idx = i;
64 break;
65 }
66 return idx;
67}
68
69struct bus_id_priv *get_busid_priv(const char *busid)
70{
71 int idx;
72 struct bus_id_priv *bid = NULL;
73
74 spin_lock(&busid_table_lock);
75 idx = get_busid_idx(busid);
76 if (idx >= 0)
77 bid = &(busid_table[idx]);
78 spin_unlock(&busid_table_lock);
79
80 return bid;
81}
82
83static int add_match_busid(char *busid)
84{
85 int i;
86 int ret = -1;
87
88 spin_lock(&busid_table_lock);
89
90 if (get_busid_idx(busid) >= 0) {
91 ret = 0;
92 goto out;
93 }
94
95 for (i = 0; i < MAX_BUSID; i++)
96 if (!busid_table[i].name[0]) {
97 strlcpy(busid_table[i].name, busid, BUSID_SIZE);
98 if ((busid_table[i].status != STUB_BUSID_ALLOC) &&
99 (busid_table[i].status != STUB_BUSID_REMOV))
100 busid_table[i].status = STUB_BUSID_ADDED;
101 ret = 0;
102 break;
103 }
104
105out:
106 spin_unlock(&busid_table_lock);
107
108 return ret;
109}
110
111int del_match_busid(char *busid)
112{
113 int idx;
114 int ret = -1;
115
116 spin_lock(&busid_table_lock);
117 idx = get_busid_idx(busid);
118 if (idx < 0)
119 goto out;
120
121
122 ret = 0;
123
124 if (busid_table[idx].status == STUB_BUSID_OTHER)
125 memset(busid_table[idx].name, 0, BUSID_SIZE);
126
127 if ((busid_table[idx].status != STUB_BUSID_OTHER) &&
128 (busid_table[idx].status != STUB_BUSID_ADDED))
129 busid_table[idx].status = STUB_BUSID_REMOV;
130
131out:
132 spin_unlock(&busid_table_lock);
133
134 return ret;
135}
136
137static ssize_t match_busid_show(struct device_driver *drv, char *buf)
138{
139 int i;
140 char *out = buf;
141
142 spin_lock(&busid_table_lock);
143 for (i = 0; i < MAX_BUSID; i++)
144 if (busid_table[i].name[0])
145 out += sprintf(out, "%s ", busid_table[i].name);
146 spin_unlock(&busid_table_lock);
147 out += sprintf(out, "\n");
148
149 return out - buf;
150}
151
152static ssize_t match_busid_store(struct device_driver *dev, const char *buf,
153 size_t count)
154{
155 int len;
156 char busid[BUSID_SIZE];
157
158 if (count < 5)
159 return -EINVAL;
160
161
162 len = strlcpy(busid, buf + 4, BUSID_SIZE);
163 if (sizeof(busid) <= len)
164 return -EINVAL;
165
166 if (!strncmp(buf, "add ", 4)) {
167 if (add_match_busid(busid) < 0)
168 return -ENOMEM;
169
170 pr_debug("add busid %s\n", busid);
171 return count;
172 }
173
174 if (!strncmp(buf, "del ", 4)) {
175 if (del_match_busid(busid) < 0)
176 return -ENODEV;
177
178 pr_debug("del busid %s\n", busid);
179 return count;
180 }
181
182 return -EINVAL;
183}
184static DRIVER_ATTR_RW(match_busid);
185
186static ssize_t rebind_store(struct device_driver *dev, const char *buf,
187 size_t count)
188{
189 int ret;
190 int len;
191 struct bus_id_priv *bid;
192
193
194 len = strnlen(buf, BUSID_SIZE);
195
196 if (!(len < BUSID_SIZE))
197 return -EINVAL;
198
199 bid = get_busid_priv(buf);
200 if (!bid)
201 return -ENODEV;
202
203 ret = device_attach(&bid->udev->dev);
204 if (ret < 0) {
205 dev_err(&bid->udev->dev, "rebind failed\n");
206 return ret;
207 }
208
209 return count;
210}
211
212static DRIVER_ATTR_WO(rebind);
213
214static struct stub_priv *stub_priv_pop_from_listhead(struct list_head *listhead)
215{
216 struct stub_priv *priv, *tmp;
217
218 list_for_each_entry_safe(priv, tmp, listhead, list) {
219 list_del(&priv->list);
220 return priv;
221 }
222
223 return NULL;
224}
225
226static struct stub_priv *stub_priv_pop(struct stub_device *sdev)
227{
228 unsigned long flags;
229 struct stub_priv *priv;
230
231 spin_lock_irqsave(&sdev->priv_lock, flags);
232
233 priv = stub_priv_pop_from_listhead(&sdev->priv_init);
234 if (priv)
235 goto done;
236
237 priv = stub_priv_pop_from_listhead(&sdev->priv_tx);
238 if (priv)
239 goto done;
240
241 priv = stub_priv_pop_from_listhead(&sdev->priv_free);
242
243done:
244 spin_unlock_irqrestore(&sdev->priv_lock, flags);
245
246 return priv;
247}
248
249void stub_device_cleanup_urbs(struct stub_device *sdev)
250{
251 struct stub_priv *priv;
252 struct urb *urb;
253
254 dev_dbg(&sdev->udev->dev, "free sdev %p\n", sdev);
255
256 while ((priv = stub_priv_pop(sdev))) {
257 urb = priv->urb;
258 dev_dbg(&sdev->udev->dev, "free urb %p\n", urb);
259 usb_kill_urb(urb);
260
261 kmem_cache_free(stub_priv_cache, priv);
262
263 kfree(urb->transfer_buffer);
264 urb->transfer_buffer = NULL;
265
266 kfree(urb->setup_packet);
267 urb->setup_packet = NULL;
268
269 usb_free_urb(urb);
270 }
271}
272
273static int __init usbip_host_init(void)
274{
275 int ret;
276
277 init_busid_table();
278
279 stub_priv_cache = KMEM_CACHE(stub_priv, SLAB_HWCACHE_ALIGN);
280 if (!stub_priv_cache) {
281 pr_err("kmem_cache_create failed\n");
282 return -ENOMEM;
283 }
284
285 ret = usb_register_device_driver(&stub_driver, THIS_MODULE);
286 if (ret) {
287 pr_err("usb_register failed %d\n", ret);
288 goto err_usb_register;
289 }
290
291 ret = driver_create_file(&stub_driver.drvwrap.driver,
292 &driver_attr_match_busid);
293 if (ret) {
294 pr_err("driver_create_file failed\n");
295 goto err_create_file;
296 }
297
298 ret = driver_create_file(&stub_driver.drvwrap.driver,
299 &driver_attr_rebind);
300 if (ret) {
301 pr_err("driver_create_file failed\n");
302 goto err_create_file;
303 }
304
305 pr_info(DRIVER_DESC " v" USBIP_VERSION "\n");
306 return ret;
307
308err_create_file:
309 usb_deregister_device_driver(&stub_driver);
310err_usb_register:
311 kmem_cache_destroy(stub_priv_cache);
312 return ret;
313}
314
315static void __exit usbip_host_exit(void)
316{
317 driver_remove_file(&stub_driver.drvwrap.driver,
318 &driver_attr_match_busid);
319
320 driver_remove_file(&stub_driver.drvwrap.driver,
321 &driver_attr_rebind);
322
323
324
325
326
327 usb_deregister_device_driver(&stub_driver);
328
329 kmem_cache_destroy(stub_priv_cache);
330}
331
332module_init(usbip_host_init);
333module_exit(usbip_host_exit);
334
335MODULE_AUTHOR(DRIVER_AUTHOR);
336MODULE_DESCRIPTION(DRIVER_DESC);
337MODULE_LICENSE("GPL");
338MODULE_VERSION(USBIP_VERSION);
339