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Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -06001/*
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
matt mooney7aaacb42011-05-11 22:33:43 -070020#include <linux/string.h>
Paul Gortmaker99c97852011-07-03 15:49:50 -040021#include <linux/module.h>
Valentina Maneaa46034c2014-03-08 14:53:33 +020022#include <linux/device.h>
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -060023
24#include "usbip_common.h"
25#include "stub.h"
26
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -060027#define DRIVER_AUTHOR "Takahiro Hirofuchi"
matt mooney64e62422011-05-11 22:33:44 -070028#define DRIVER_DESC "USB/IP Host Driver"
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -060029
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -060030struct kmem_cache *stub_priv_cache;
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -060031/*
32 * busid_tables defines matching busids that usbip can grab. A user can change
33 * dynamically what device is locally used and what device is exported to a
34 * remote host.
35 */
36#define MAX_BUSID 16
Endre Kollaraa5873e2010-07-27 12:39:30 +020037static struct bus_id_priv busid_table[MAX_BUSID];
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -060038static spinlock_t busid_table_lock;
39
matt mooneyefad25e2011-05-19 21:36:57 -070040static void init_busid_table(void)
41{
Kurt Kanzenbach521e1e72013-04-04 16:03:10 +020042 /*
43 * This also sets the bus_table[i].status to
44 * STUB_BUSID_OTHER, which is 0.
45 */
matt mooney0a186be2011-05-27 01:49:24 -070046 memset(busid_table, 0, sizeof(busid_table));
matt mooneyefad25e2011-05-19 21:36:57 -070047
48 spin_lock_init(&busid_table_lock);
49}
50
matt mooney41e02f02011-05-19 21:36:58 -070051/*
52 * Find the index of the busid by name.
53 * Must be called with busid_table_lock held.
54 */
55static int get_busid_idx(const char *busid)
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -060056{
57 int i;
matt mooney41e02f02011-05-19 21:36:58 -070058 int idx = -1;
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -060059
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -060060 for (i = 0; i < MAX_BUSID; i++)
Endre Kollaraa5873e2010-07-27 12:39:30 +020061 if (busid_table[i].name[0])
62 if (!strncmp(busid_table[i].name, busid, BUSID_SIZE)) {
matt mooney41e02f02011-05-19 21:36:58 -070063 idx = i;
64 break;
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -060065 }
matt mooney41e02f02011-05-19 21:36:58 -070066 return idx;
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -060067}
68
Endre Kollaraa5873e2010-07-27 12:39:30 +020069struct bus_id_priv *get_busid_priv(const char *busid)
70{
matt mooney41e02f02011-05-19 21:36:58 -070071 int idx;
72 struct bus_id_priv *bid = NULL;
Endre Kollaraa5873e2010-07-27 12:39:30 +020073
74 spin_lock(&busid_table_lock);
matt mooney41e02f02011-05-19 21:36:58 -070075 idx = get_busid_idx(busid);
76 if (idx >= 0)
77 bid = &(busid_table[idx]);
Endre Kollaraa5873e2010-07-27 12:39:30 +020078 spin_unlock(&busid_table_lock);
79
matt mooney41e02f02011-05-19 21:36:58 -070080 return bid;
Endre Kollaraa5873e2010-07-27 12:39:30 +020081}
82
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -060083static int add_match_busid(char *busid)
84{
85 int i;
matt mooney41e02f02011-05-19 21:36:58 -070086 int ret = -1;
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -060087
88 spin_lock(&busid_table_lock);
matt mooney41e02f02011-05-19 21:36:58 -070089 /* already registered? */
90 if (get_busid_idx(busid) >= 0) {
91 ret = 0;
92 goto out;
93 }
94
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -060095 for (i = 0; i < MAX_BUSID; i++)
Endre Kollaraa5873e2010-07-27 12:39:30 +020096 if (!busid_table[i].name[0]) {
Rickard Strandqvist96955ed2014-07-26 16:43:20 +020097 strlcpy(busid_table[i].name, busid, BUSID_SIZE);
Endre Kollaraa5873e2010-07-27 12:39:30 +020098 if ((busid_table[i].status != STUB_BUSID_ALLOC) &&
99 (busid_table[i].status != STUB_BUSID_REMOV))
100 busid_table[i].status = STUB_BUSID_ADDED;
matt mooney41e02f02011-05-19 21:36:58 -0700101 ret = 0;
102 break;
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600103 }
matt mooney41e02f02011-05-19 21:36:58 -0700104
105out:
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600106 spin_unlock(&busid_table_lock);
107
matt mooney41e02f02011-05-19 21:36:58 -0700108 return ret;
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600109}
110
Endre Kollaraa5873e2010-07-27 12:39:30 +0200111int del_match_busid(char *busid)
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600112{
matt mooney41e02f02011-05-19 21:36:58 -0700113 int idx;
114 int ret = -1;
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600115
116 spin_lock(&busid_table_lock);
matt mooney41e02f02011-05-19 21:36:58 -0700117 idx = get_busid_idx(busid);
118 if (idx < 0)
119 goto out;
120
121 /* found */
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:
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600132 spin_unlock(&busid_table_lock);
133
matt mooney41e02f02011-05-19 21:36:58 -0700134 return ret;
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600135}
matt mooney6c033b42011-05-06 03:47:42 -0700136
matt mooneyefad25e2011-05-19 21:36:57 -0700137static ssize_t show_match_busid(struct device_driver *drv, char *buf)
Endre Kollaraa5873e2010-07-27 12:39:30 +0200138{
139 int i;
matt mooneyefad25e2011-05-19 21:36:57 -0700140 char *out = buf;
Endre Kollaraa5873e2010-07-27 12:39:30 +0200141
matt mooneyefad25e2011-05-19 21:36:57 -0700142 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);
matt mooneyefad25e2011-05-19 21:36:57 -0700147 out += sprintf(out, "\n");
matt mooney41e02f02011-05-19 21:36:58 -0700148
matt mooneyefad25e2011-05-19 21:36:57 -0700149 return out - buf;
Endre Kollaraa5873e2010-07-27 12:39:30 +0200150}
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600151
152static ssize_t store_match_busid(struct device_driver *dev, const char *buf,
matt mooney6c033b42011-05-06 03:47:42 -0700153 size_t count)
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600154{
155 int len;
Kay Sieverse9133972008-10-30 01:59:32 +0100156 char busid[BUSID_SIZE];
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600157
158 if (count < 5)
159 return -EINVAL;
160
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600161 /* busid needs to include \0 termination */
Rickard Strandqvist96955ed2014-07-26 16:43:20 +0200162 len = strlcpy(busid, buf + 4, BUSID_SIZE);
163 if (sizeof(busid) <= len)
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600164 return -EINVAL;
165
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600166 if (!strncmp(buf, "add ", 4)) {
Kurt Kanzenbach2183b772013-04-04 16:03:09 +0200167 if (add_match_busid(busid) < 0)
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600168 return -ENOMEM;
Kurt Kanzenbach2183b772013-04-04 16:03:09 +0200169
170 pr_debug("add busid %s\n", busid);
171 return count;
matt mooney41e02f02011-05-19 21:36:58 -0700172 }
Kurt Kanzenbach2183b772013-04-04 16:03:09 +0200173
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;
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600183}
matt mooney41e02f02011-05-19 21:36:58 -0700184static DRIVER_ATTR(match_busid, S_IRUSR | S_IWUSR, show_match_busid,
matt mooney6c033b42011-05-06 03:47:42 -0700185 store_match_busid);
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600186
Valentina Maneaa46034c2014-03-08 14:53:33 +0200187static ssize_t rebind_store(struct device_driver *dev, const char *buf,
188 size_t count)
189{
190 int ret;
191 int len;
192 struct bus_id_priv *bid;
193
194 /* buf length should be less that BUSID_SIZE */
195 len = strnlen(buf, BUSID_SIZE);
196
197 if (!(len < BUSID_SIZE))
198 return -EINVAL;
199
200 bid = get_busid_priv(buf);
201 if (!bid)
202 return -ENODEV;
203
204 ret = device_attach(&bid->udev->dev);
205 if (ret < 0) {
206 dev_err(&bid->udev->dev, "rebind failed\n");
207 return ret;
208 }
209
210 return count;
211}
212
213static DRIVER_ATTR_WO(rebind);
214
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600215static struct stub_priv *stub_priv_pop_from_listhead(struct list_head *listhead)
216{
217 struct stub_priv *priv, *tmp;
218
219 list_for_each_entry_safe(priv, tmp, listhead, list) {
220 list_del(&priv->list);
221 return priv;
222 }
223
224 return NULL;
225}
226
227static struct stub_priv *stub_priv_pop(struct stub_device *sdev)
228{
229 unsigned long flags;
230 struct stub_priv *priv;
231
232 spin_lock_irqsave(&sdev->priv_lock, flags);
233
234 priv = stub_priv_pop_from_listhead(&sdev->priv_init);
matt mooney41e02f02011-05-19 21:36:58 -0700235 if (priv)
236 goto done;
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600237
238 priv = stub_priv_pop_from_listhead(&sdev->priv_tx);
matt mooney41e02f02011-05-19 21:36:58 -0700239 if (priv)
240 goto done;
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600241
242 priv = stub_priv_pop_from_listhead(&sdev->priv_free);
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600243
matt mooney41e02f02011-05-19 21:36:58 -0700244done:
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600245 spin_unlock_irqrestore(&sdev->priv_lock, flags);
matt mooney41e02f02011-05-19 21:36:58 -0700246
247 return priv;
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600248}
249
250void stub_device_cleanup_urbs(struct stub_device *sdev)
251{
252 struct stub_priv *priv;
matt mooney41e02f02011-05-19 21:36:58 -0700253 struct urb *urb;
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600254
matt mooney1a4b6f62011-05-19 16:47:32 -0700255 dev_dbg(&sdev->udev->dev, "free sdev %p\n", sdev);
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600256
257 while ((priv = stub_priv_pop(sdev))) {
matt mooney41e02f02011-05-19 21:36:58 -0700258 urb = priv->urb;
matt mooney1a4b6f62011-05-19 16:47:32 -0700259 dev_dbg(&sdev->udev->dev, "free urb %p\n", urb);
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600260 usb_kill_urb(urb);
261
262 kmem_cache_free(stub_priv_cache, priv);
263
Ilia Mirkin06dde502011-03-13 00:29:12 -0500264 kfree(urb->transfer_buffer);
Ilia Mirkin06dde502011-03-13 00:29:12 -0500265 kfree(urb->setup_packet);
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600266 usb_free_urb(urb);
267 }
268}
269
matt mooney27ed5da2011-05-19 21:36:59 -0700270static int __init usbip_host_init(void)
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600271{
272 int ret;
273
Bart Westgeest737912e2012-01-25 13:46:32 -0500274 init_busid_table();
matt mooney7d4de892011-05-19 21:37:00 -0700275
Bart Westgeest737912e2012-01-25 13:46:32 -0500276 stub_priv_cache = KMEM_CACHE(stub_priv, SLAB_HWCACHE_ALIGN);
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600277 if (!stub_priv_cache) {
matt mooney41e02f02011-05-19 21:36:58 -0700278 pr_err("kmem_cache_create failed\n");
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600279 return -ENOMEM;
280 }
281
Valentina Maneab7945b72014-01-23 23:12:29 +0200282 ret = usb_register_device_driver(&stub_driver, THIS_MODULE);
navin patidar1583aeb2013-09-10 10:44:07 +0530283 if (ret) {
matt mooney1a4b6f62011-05-19 16:47:32 -0700284 pr_err("usb_register failed %d\n", ret);
matt mooney41e02f02011-05-19 21:36:58 -0700285 goto err_usb_register;
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600286 }
287
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600288 ret = driver_create_file(&stub_driver.drvwrap.driver,
289 &driver_attr_match_busid);
navin patidar1583aeb2013-09-10 10:44:07 +0530290 if (ret) {
matt mooney41e02f02011-05-19 21:36:58 -0700291 pr_err("driver_create_file failed\n");
292 goto err_create_file;
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600293 }
294
Valentina Maneaa46034c2014-03-08 14:53:33 +0200295 ret = driver_create_file(&stub_driver.drvwrap.driver,
296 &driver_attr_rebind);
297 if (ret) {
298 pr_err("driver_create_file failed\n");
299 goto err_create_file;
300 }
301
matt mooney41e02f02011-05-19 21:36:58 -0700302 pr_info(DRIVER_DESC " v" USBIP_VERSION "\n");
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600303 return ret;
matt mooney41e02f02011-05-19 21:36:58 -0700304
305err_create_file:
Valentina Maneab7945b72014-01-23 23:12:29 +0200306 usb_deregister_device_driver(&stub_driver);
matt mooney41e02f02011-05-19 21:36:58 -0700307err_usb_register:
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600308 kmem_cache_destroy(stub_priv_cache);
309 return ret;
310}
311
matt mooney27ed5da2011-05-19 21:36:59 -0700312static void __exit usbip_host_exit(void)
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600313{
314 driver_remove_file(&stub_driver.drvwrap.driver,
315 &driver_attr_match_busid);
316
Valentina Maneaa46034c2014-03-08 14:53:33 +0200317 driver_remove_file(&stub_driver.drvwrap.driver,
318 &driver_attr_rebind);
319
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600320 /*
321 * deregister() calls stub_disconnect() for all devices. Device
322 * specific data is cleared in stub_disconnect().
323 */
Valentina Maneab7945b72014-01-23 23:12:29 +0200324 usb_deregister_device_driver(&stub_driver);
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600325
326 kmem_cache_destroy(stub_priv_cache);
327}
328
matt mooney27ed5da2011-05-19 21:36:59 -0700329module_init(usbip_host_init);
330module_exit(usbip_host_exit);
Takahiro Hirofuchi4d7b5c72008-07-09 14:56:51 -0600331
332MODULE_AUTHOR(DRIVER_AUTHOR);
333MODULE_DESCRIPTION(DRIVER_DESC);
334MODULE_LICENSE("GPL");
matt mooney6973c6f2011-05-11 01:54:14 -0700335MODULE_VERSION(USBIP_VERSION);