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6#include <linux/string.h>
7#include <linux/module.h>
8#include <linux/device.h>
9
10#include "usbip_common.h"
11#include "stub.h"
12
13#define DRIVER_AUTHOR "Takahiro Hirofuchi"
14#define DRIVER_DESC "USB/IP Host Driver"
15
16struct kmem_cache *stub_priv_cache;
17
18
19
20
21
22
23#define MAX_BUSID 16
24static struct bus_id_priv busid_table[MAX_BUSID];
25static spinlock_t busid_table_lock;
26
27static void init_busid_table(void)
28{
29 int i;
30
31
32
33
34
35 memset(busid_table, 0, sizeof(busid_table));
36
37 spin_lock_init(&busid_table_lock);
38
39 for (i = 0; i < MAX_BUSID; i++)
40 spin_lock_init(&busid_table[i].busid_lock);
41}
42
43
44
45
46
47static int get_busid_idx(const char *busid)
48{
49 int i;
50 int idx = -1;
51
52 for (i = 0; i < MAX_BUSID; i++) {
53 spin_lock(&busid_table[i].busid_lock);
54 if (busid_table[i].name[0])
55 if (!strncmp(busid_table[i].name, busid, BUSID_SIZE)) {
56 idx = i;
57 spin_unlock(&busid_table[i].busid_lock);
58 break;
59 }
60 spin_unlock(&busid_table[i].busid_lock);
61 }
62 return idx;
63}
64
65
66struct bus_id_priv *get_busid_priv(const char *busid)
67{
68 int idx;
69 struct bus_id_priv *bid = NULL;
70
71 spin_lock(&busid_table_lock);
72 idx = get_busid_idx(busid);
73 if (idx >= 0) {
74 bid = &(busid_table[idx]);
75
76 spin_lock(&bid->busid_lock);
77 }
78 spin_unlock(&busid_table_lock);
79
80 return bid;
81}
82
83void put_busid_priv(struct bus_id_priv *bid)
84{
85 if (bid)
86 spin_unlock(&bid->busid_lock);
87}
88
89static int add_match_busid(char *busid)
90{
91 int i;
92 int ret = -1;
93
94 spin_lock(&busid_table_lock);
95
96 if (get_busid_idx(busid) >= 0) {
97 ret = 0;
98 goto out;
99 }
100
101 for (i = 0; i < MAX_BUSID; i++) {
102 spin_lock(&busid_table[i].busid_lock);
103 if (!busid_table[i].name[0]) {
104 strlcpy(busid_table[i].name, busid, BUSID_SIZE);
105 if ((busid_table[i].status != STUB_BUSID_ALLOC) &&
106 (busid_table[i].status != STUB_BUSID_REMOV))
107 busid_table[i].status = STUB_BUSID_ADDED;
108 ret = 0;
109 spin_unlock(&busid_table[i].busid_lock);
110 break;
111 }
112 spin_unlock(&busid_table[i].busid_lock);
113 }
114
115out:
116 spin_unlock(&busid_table_lock);
117
118 return ret;
119}
120
121int del_match_busid(char *busid)
122{
123 int idx;
124 int ret = -1;
125
126 spin_lock(&busid_table_lock);
127 idx = get_busid_idx(busid);
128 if (idx < 0)
129 goto out;
130
131
132 ret = 0;
133
134 spin_lock(&busid_table[idx].busid_lock);
135
136 if (busid_table[idx].status == STUB_BUSID_OTHER)
137 memset(busid_table[idx].name, 0, BUSID_SIZE);
138
139 if ((busid_table[idx].status != STUB_BUSID_OTHER) &&
140 (busid_table[idx].status != STUB_BUSID_ADDED))
141 busid_table[idx].status = STUB_BUSID_REMOV;
142
143 spin_unlock(&busid_table[idx].busid_lock);
144out:
145 spin_unlock(&busid_table_lock);
146
147 return ret;
148}
149
150static ssize_t match_busid_show(struct device_driver *drv, char *buf)
151{
152 int i;
153 char *out = buf;
154
155 spin_lock(&busid_table_lock);
156 for (i = 0; i < MAX_BUSID; i++) {
157 spin_lock(&busid_table[i].busid_lock);
158 if (busid_table[i].name[0])
159 out += sprintf(out, "%s ", busid_table[i].name);
160 spin_unlock(&busid_table[i].busid_lock);
161 }
162 spin_unlock(&busid_table_lock);
163 out += sprintf(out, "\n");
164
165 return out - buf;
166}
167
168static ssize_t match_busid_store(struct device_driver *dev, const char *buf,
169 size_t count)
170{
171 int len;
172 char busid[BUSID_SIZE];
173
174 if (count < 5)
175 return -EINVAL;
176
177
178 len = strlcpy(busid, buf + 4, BUSID_SIZE);
179 if (sizeof(busid) <= len)
180 return -EINVAL;
181
182 if (!strncmp(buf, "add ", 4)) {
183 if (add_match_busid(busid) < 0)
184 return -ENOMEM;
185
186 pr_debug("add busid %s\n", busid);
187 return count;
188 }
189
190 if (!strncmp(buf, "del ", 4)) {
191 if (del_match_busid(busid) < 0)
192 return -ENODEV;
193
194 pr_debug("del busid %s\n", busid);
195 return count;
196 }
197
198 return -EINVAL;
199}
200static DRIVER_ATTR_RW(match_busid);
201
202static int do_rebind(char *busid, struct bus_id_priv *busid_priv)
203{
204 int ret = 0;
205
206
207 if (busid_priv->udev->dev.parent)
208 device_lock(busid_priv->udev->dev.parent);
209 ret = device_attach(&busid_priv->udev->dev);
210 if (busid_priv->udev->dev.parent)
211 device_unlock(busid_priv->udev->dev.parent);
212 if (ret < 0)
213 dev_err(&busid_priv->udev->dev, "rebind failed\n");
214 return ret;
215}
216
217static void stub_device_rebind(void)
218{
219#if IS_MODULE(CONFIG_USBIP_HOST)
220 struct bus_id_priv *busid_priv;
221 int i;
222
223
224 spin_lock(&busid_table_lock);
225 for (i = 0; i < MAX_BUSID; i++) {
226 if (busid_table[i].name[0] &&
227 busid_table[i].shutdown_busid) {
228 busid_priv = &(busid_table[i]);
229 busid_priv->status = STUB_BUSID_OTHER;
230 }
231 }
232 spin_unlock(&busid_table_lock);
233
234
235 for (i = 0; i < MAX_BUSID; i++) {
236 if (busid_table[i].name[0] &&
237 busid_table[i].shutdown_busid) {
238 busid_priv = &(busid_table[i]);
239 do_rebind(busid_table[i].name, busid_priv);
240 }
241 }
242#endif
243}
244
245static ssize_t rebind_store(struct device_driver *dev, const char *buf,
246 size_t count)
247{
248 int ret;
249 int len;
250 struct bus_id_priv *bid;
251
252
253 len = strnlen(buf, BUSID_SIZE);
254
255 if (!(len < BUSID_SIZE))
256 return -EINVAL;
257
258 bid = get_busid_priv(buf);
259 if (!bid)
260 return -ENODEV;
261
262
263 bid->status = STUB_BUSID_OTHER;
264
265 put_busid_priv(bid);
266
267 ret = do_rebind((char *) buf, bid);
268 if (ret < 0)
269 return ret;
270
271
272 del_match_busid((char *) buf);
273
274 return count;
275}
276
277static DRIVER_ATTR_WO(rebind);
278
279static struct stub_priv *stub_priv_pop_from_listhead(struct list_head *listhead)
280{
281 struct stub_priv *priv, *tmp;
282
283 list_for_each_entry_safe(priv, tmp, listhead, list) {
284 list_del(&priv->list);
285 return priv;
286 }
287
288 return NULL;
289}
290
291static struct stub_priv *stub_priv_pop(struct stub_device *sdev)
292{
293 unsigned long flags;
294 struct stub_priv *priv;
295
296 spin_lock_irqsave(&sdev->priv_lock, flags);
297
298 priv = stub_priv_pop_from_listhead(&sdev->priv_init);
299 if (priv)
300 goto done;
301
302 priv = stub_priv_pop_from_listhead(&sdev->priv_tx);
303 if (priv)
304 goto done;
305
306 priv = stub_priv_pop_from_listhead(&sdev->priv_free);
307
308done:
309 spin_unlock_irqrestore(&sdev->priv_lock, flags);
310
311 return priv;
312}
313
314void stub_device_cleanup_urbs(struct stub_device *sdev)
315{
316 struct stub_priv *priv;
317 struct urb *urb;
318
319 dev_dbg(&sdev->udev->dev, "Stub device cleaning up urbs\n");
320
321 while ((priv = stub_priv_pop(sdev))) {
322 urb = priv->urb;
323 dev_dbg(&sdev->udev->dev, "free urb seqnum %lu\n",
324 priv->seqnum);
325 usb_kill_urb(urb);
326
327 kmem_cache_free(stub_priv_cache, priv);
328
329 kfree(urb->transfer_buffer);
330 urb->transfer_buffer = NULL;
331
332 kfree(urb->setup_packet);
333 urb->setup_packet = NULL;
334
335 usb_free_urb(urb);
336 }
337}
338
339static int __init usbip_host_init(void)
340{
341 int ret;
342
343 init_busid_table();
344
345 stub_priv_cache = KMEM_CACHE(stub_priv, SLAB_HWCACHE_ALIGN);
346 if (!stub_priv_cache) {
347 pr_err("kmem_cache_create failed\n");
348 return -ENOMEM;
349 }
350
351 ret = usb_register_device_driver(&stub_driver, THIS_MODULE);
352 if (ret) {
353 pr_err("usb_register failed %d\n", ret);
354 goto err_usb_register;
355 }
356
357 ret = driver_create_file(&stub_driver.drvwrap.driver,
358 &driver_attr_match_busid);
359 if (ret) {
360 pr_err("driver_create_file failed\n");
361 goto err_create_file;
362 }
363
364 ret = driver_create_file(&stub_driver.drvwrap.driver,
365 &driver_attr_rebind);
366 if (ret) {
367 pr_err("driver_create_file failed\n");
368 goto err_create_file;
369 }
370
371 return ret;
372
373err_create_file:
374 usb_deregister_device_driver(&stub_driver);
375err_usb_register:
376 kmem_cache_destroy(stub_priv_cache);
377 return ret;
378}
379
380static void __exit usbip_host_exit(void)
381{
382 driver_remove_file(&stub_driver.drvwrap.driver,
383 &driver_attr_match_busid);
384
385 driver_remove_file(&stub_driver.drvwrap.driver,
386 &driver_attr_rebind);
387
388
389
390
391
392 usb_deregister_device_driver(&stub_driver);
393
394
395 stub_device_rebind();
396
397 kmem_cache_destroy(stub_priv_cache);
398}
399
400module_init(usbip_host_init);
401module_exit(usbip_host_exit);
402
403MODULE_AUTHOR(DRIVER_AUTHOR);
404MODULE_DESCRIPTION(DRIVER_DESC);
405MODULE_LICENSE("GPL");
406