Release 4.11 drivers/usb/usbip/stub_dev.c

/*
 * Copyright (C) 2003-2008 Takahiro Hirofuchi
 *
 * This is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
 * USA.
 */

#include <linux/device.h>
#include <linux/file.h>
#include <linux/kthread.h>
#include <linux/module.h>

#include "usbip_common.h"
#include "stub.h"

/*
 * usbip_status shows the status of usbip-host as long as this driver is bound
 * to the target device.
 */


static ssize_t usbip_status_show(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	struct stub_device *sdev = dev_get_drvdata(dev);
	int status;

	if (!sdev) {
		dev_err(dev, "sdev is null\n");
		return -ENODEV;
	}

	spin_lock_irq(&sdev->ud.lock);
	status = sdev->ud.status;
	spin_unlock_irq(&sdev->ud.lock);

	return snprintf(buf, PAGE_SIZE, "%d\n", status);
}
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Takahiro Hirofuchi
88
96.70%
1
33.33%
Huawei (Harvey) Yang
2
2.20%
1
33.33%
Greg Kroah-Hartman
1
1.10%
1
33.33%
Total
91
100.00%
3
100.00%

static DEVICE_ATTR_RO(usbip_status);

/*
 * usbip_sockfd gets a socket descriptor of an established TCP connection that
 * is used to transfer usbip requests by kernel threads. -1 is a magic number
 * by which usbip connection is finished.
 */


static ssize_t store_sockfd(struct device *dev, struct device_attribute *attr,
			    const char *buf, size_t count)
{
	struct stub_device *sdev = dev_get_drvdata(dev);
	int sockfd = 0;
	struct socket *socket;
	int rv;

	if (!sdev) {
		dev_err(dev, "sdev is null\n");
		return -ENODEV;
	}

	rv = sscanf(buf, "%d", &sockfd);
	if (rv != 1)
		return -EINVAL;

	if (sockfd != -1) {
		int err;

		dev_info(dev, "stub up\n");

		spin_lock_irq(&sdev->ud.lock);

		if (sdev->ud.status != SDEV_ST_AVAILABLE) {
			dev_err(dev, "not ready\n");
			goto err;
		}

		socket = sockfd_lookup(sockfd, &err);
		if (!socket)
			goto err;

		sdev->ud.tcp_socket = socket;

		spin_unlock_irq(&sdev->ud.lock);

		sdev->ud.tcp_rx = kthread_get_run(stub_rx_loop, &sdev->ud,
						  "stub_rx");
		sdev->ud.tcp_tx = kthread_get_run(stub_tx_loop, &sdev->ud,
						  "stub_tx");

		spin_lock_irq(&sdev->ud.lock);
		sdev->ud.status = SDEV_ST_USED;
		spin_unlock_irq(&sdev->ud.lock);

	} else {
		dev_info(dev, "stub down\n");

		spin_lock_irq(&sdev->ud.lock);
		if (sdev->ud.status != SDEV_ST_USED)
			goto err;

		spin_unlock_irq(&sdev->ud.lock);

		usbip_event_add(&sdev->ud, SDEV_EVENT_DOWN);
	}

	return count;

err:
	spin_unlock_irq(&sdev->ud.lock);
	return -EINVAL;
}
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Takahiro Hirofuchi
230
74.19%
1
14.29%
Arnd Bergmann
27
8.71%
1
14.29%
Kurt Kanzenbach
21
6.77%
1
14.29%
Elena Oat
15
4.84%
1
14.29%
Al Viro
9
2.90%
1
14.29%
Huawei (Harvey) Yang
6
1.94%
1
14.29%
Oleg Nesterov
2
0.65%
1
14.29%
Total
310
100.00%
7
100.00%

static DEVICE_ATTR(usbip_sockfd, S_IWUSR, NULL, store_sockfd);



static int stub_add_files(struct device *dev)
{
	int err = 0;

	err = device_create_file(dev, &dev_attr_usbip_status);
	if (err)
		goto err_status;

	err = device_create_file(dev, &dev_attr_usbip_sockfd);
	if (err)
		goto err_sockfd;

	err = device_create_file(dev, &dev_attr_usbip_debug);
	if (err)
		goto err_debug;

	return 0;

err_debug:
	device_remove_file(dev, &dev_attr_usbip_sockfd);
err_sockfd:
	device_remove_file(dev, &dev_attr_usbip_status);
err_status:
	return err;
}

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Takahiro Hirofuchi
95
100.00%
1
100.00%
Total
95
100.00%
1
100.00%



static void stub_remove_files(struct device *dev)
{
	device_remove_file(dev, &dev_attr_usbip_status);
	device_remove_file(dev, &dev_attr_usbip_sockfd);
	device_remove_file(dev, &dev_attr_usbip_debug);
}

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Takahiro Hirofuchi
35
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1
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35
100.00%
1
100.00%



static void stub_shutdown_connection(struct usbip_device *ud)
{
	struct stub_device *sdev = container_of(ud, struct stub_device, ud);

	/*
         * When removing an exported device, kernel panic sometimes occurred
         * and then EIP was sk_wait_data of stub_rx thread. Is this because
         * sk_wait_data returned though stub_rx thread was already finished by
         * step 1?
         */
	if (ud->tcp_socket) {
		dev_dbg(&sdev->udev->dev, "shutdown tcp_socket %p\n",
			ud->tcp_socket);
		kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
	}

	/* 1. stop threads */
	if (ud->tcp_rx) {
		kthread_stop_put(ud->tcp_rx);
		ud->tcp_rx = NULL;
	}
	if (ud->tcp_tx) {
		kthread_stop_put(ud->tcp_tx);
		ud->tcp_tx = NULL;
	}

	/*
         * 2. close the socket
         *
         * tcp_socket is freed after threads are killed so that usbip_xmit does
         * not touch NULL socket.
         */
	if (ud->tcp_socket) {
		sockfd_put(ud->tcp_socket);
		ud->tcp_socket = NULL;
	}

	/* 3. free used data */
	stub_device_cleanup_urbs(sdev);

	/* 4. free stub_unlink */
	{
		unsigned long flags;
		struct stub_unlink *unlink, *tmp;

		spin_lock_irqsave(&sdev->priv_lock, flags);
		list_for_each_entry_safe(unlink, tmp, &sdev->unlink_tx, list) {
			list_del(&unlink->list);
			kfree(unlink);
		}
		list_for_each_entry_safe(unlink, tmp, &sdev->unlink_free,
					 list) {
			list_del(&unlink->list);
			kfree(unlink);
		}
		spin_unlock_irqrestore(&sdev->priv_lock, flags);
	}
}

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Takahiro Hirofuchi
168
77.78%
1
12.50%
Navin Patidar
16
7.41%
1
12.50%
Arjan Mels
12
5.56%
1
12.50%
Matt Mooney
9
4.17%
2
25.00%
Arnd Bergmann
8
3.70%
1
12.50%
Oleg Nesterov
2
0.93%
1
12.50%
Al Viro
1
0.46%
1
12.50%
Total
216
100.00%
8
100.00%



static void stub_device_reset(struct usbip_device *ud)
{
	struct stub_device *sdev = container_of(ud, struct stub_device, ud);
	struct usb_device *udev = sdev->udev;
	int ret;

	dev_dbg(&udev->dev, "device reset");

	ret = usb_lock_device_for_reset(udev, NULL);
	if (ret < 0) {
		dev_err(&udev->dev, "lock for reset\n");
		spin_lock_irq(&ud->lock);
		ud->status = SDEV_ST_ERROR;
		spin_unlock_irq(&ud->lock);
		return;
	}

	/* try to reset the device */
	ret = usb_reset_device(udev);
	usb_unlock_device(udev);

	spin_lock_irq(&ud->lock);
	if (ret) {
		dev_err(&udev->dev, "device reset\n");
		ud->status = SDEV_ST_ERROR;
	} else {
		dev_info(&udev->dev, "device reset\n");
		ud->status = SDEV_ST_AVAILABLE;
	}
	spin_unlock_irq(&ud->lock);
}

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Takahiro Hirofuchi
156
92.86%
1
20.00%
Matt Mooney
6
3.57%
1
20.00%
Huawei (Harvey) Yang
4
2.38%
1
20.00%
Max Vozeler
1
0.60%
1
20.00%
Alexander Popov
1
0.60%
1
20.00%
Total
168
100.00%
5
100.00%



static void stub_device_unusable(struct usbip_device *ud)
{
	spin_lock_irq(&ud->lock);
	ud->status = SDEV_ST_ERROR;
	spin_unlock_irq(&ud->lock);
}

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Takahiro Hirofuchi
31
93.94%
1
50.00%
Huawei (Harvey) Yang
2
6.06%
1
50.00%
Total
33
100.00%
2
100.00%

/**
 * stub_device_alloc - allocate a new stub_device struct
 * @udev: usb_device of a new device
 *
 * Allocates and initializes a new stub_device struct.
 */


static struct stub_device *stub_device_alloc(struct usb_device *udev)
{
	struct stub_device *sdev;
	int busnum = udev->bus->busnum;
	int devnum = udev->devnum;

	dev_dbg(&udev->dev, "allocating stub device");

	/* yes, it's a new device */
	sdev = kzalloc(sizeof(struct stub_device), GFP_KERNEL);
	if (!sdev)
		return NULL;

	sdev->udev = usb_get_dev(udev);

	/*
         * devid is defined with devnum when this driver is first allocated.
         * devnum may change later if a device is reset. However, devid never
         * changes during a usbip connection.
         */
	sdev->devid		= (busnum << 16) | devnum;
	sdev->ud.side		= USBIP_STUB;
	sdev->ud.status		= SDEV_ST_AVAILABLE;
	spin_lock_init(&sdev->ud.lock);
	sdev->ud.tcp_socket	= NULL;

	INIT_LIST_HEAD(&sdev->priv_init);
	INIT_LIST_HEAD(&sdev->priv_tx);
	INIT_LIST_HEAD(&sdev->priv_free);
	INIT_LIST_HEAD(&sdev->unlink_free);
	INIT_LIST_HEAD(&sdev->unlink_tx);
	spin_lock_init(&sdev->priv_lock);

	init_waitqueue_head(&sdev->tx_waitq);

	sdev->ud.eh_ops.shutdown = stub_shutdown_connection;
	sdev->ud.eh_ops.reset    = stub_device_reset;
	sdev->ud.eh_ops.unusable = stub_device_unusable;

	usbip_start_eh(&sdev->ud);

	dev_dbg(&udev->dev, "register new device\n");

	return sdev;
}

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204
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1
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Valentina Manea
11
4.80%
1
25.00%
Max Vozeler
9
3.93%
1
25.00%
Matt Mooney
5
2.18%
1
25.00%
Total
229
100.00%
4
100.00%



static void stub_device_free(struct stub_device *sdev)
{
	kfree(sdev);
}

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15
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1
6.25%
1
50.00%
Total
16
100.00%
2
100.00%



static int stub_probe(struct usb_device *udev)
{
	struct stub_device *sdev = NULL;
	const char *udev_busid = dev_name(&udev->dev);
	struct bus_id_priv *busid_priv;
	int rc;

	dev_dbg(&udev->dev, "Enter\n");

	/* check we should claim or not by busid_table */
	busid_priv = get_busid_priv(udev_busid);
	if (!busid_priv || (busid_priv->status == STUB_BUSID_REMOV) ||
	    (busid_priv->status == STUB_BUSID_OTHER)) {
		dev_info(&udev->dev,
			"%s is not in match_busid table... skip!\n",
			udev_busid);

		/*
                 * Return value should be ENODEV or ENOXIO to continue trying
                 * other matched drivers by the driver core.
                 * See driver_probe_device() in driver/base/dd.c
                 */
		return -ENODEV;
	}

	if (udev->descriptor.bDeviceClass == USB_CLASS_HUB) {
		dev_dbg(&udev->dev, "%s is a usb hub device... skip!\n",
			 udev_busid);
		return -ENODEV;
	}

	if (!strcmp(udev->bus->bus_name, "vhci_hcd")) {
		dev_dbg(&udev->dev,
			"%s is attached on vhci_hcd... skip!\n",
			udev_busid);

		return -ENODEV;
	}

	/* ok, this is my device */
	sdev = stub_device_alloc(udev);
	if (!sdev)
		return -ENOMEM;

	dev_info(&udev->dev,
		"usbip-host: register new device (bus %u dev %u)\n",
		udev->bus->busnum, udev->devnum);

	busid_priv->shutdown_busid = 0;

	/* set private data to usb_device */
	dev_set_drvdata(&udev->dev, sdev);
	busid_priv->sdev = sdev;
	busid_priv->udev = udev;

	/*
         * Claim this hub port.
         * It doesn't matter what value we pass as owner
         * (struct dev_state) as long as it is unique.
         */
	rc = usb_hub_claim_port(udev->parent, udev->portnum,
			(struct usb_dev_state *) udev);
	if (rc) {
		dev_dbg(&udev->dev, "unable to claim port\n");
		goto err_port;
	}

	rc = stub_add_files(&udev->dev);
	if (rc) {
		dev_err(&udev->dev, "stub_add_files for %s\n", udev_busid);
		goto err_files;
	}
	busid_priv->status = STUB_BUSID_ALLOC;

	return 0;
err_files:
	usb_hub_release_port(udev->parent, udev->portnum,
			     (struct usb_dev_state *) udev);
err_port:
	dev_set_drvdata(&udev->dev, NULL);
	usb_put_dev(udev);

	busid_priv->sdev = NULL;
	stub_device_free(sdev);
	return rc;
}

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Takahiro Hirofuchi
129
36.44%
1
8.33%
Valentina Manea
78
22.03%
4
33.33%
Endre Kollar
72
20.34%
1
8.33%
Alexey Khoroshilov
41
11.58%
1
8.33%
Matt Mooney
15
4.24%
1
8.33%
Vasiliy Kulikov
9
2.54%
1
8.33%
Huawei (Harvey) Yang
5
1.41%
1
8.33%
Kay Sievers
4
1.13%
1
8.33%
Elad Wexler
1
0.28%
1
8.33%
Total
354
100.00%
12
100.00%



static void shutdown_busid(struct bus_id_priv *busid_priv)
{
	if (busid_priv->sdev && !busid_priv->shutdown_busid) {
		busid_priv->shutdown_busid = 1;
		usbip_event_add(&busid_priv->sdev->ud, SDEV_EVENT_REMOVED);

		/* wait for the stop of the event handler */
		usbip_stop_eh(&busid_priv->sdev->ud);
	}
}

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52
98.11%
1
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1
1.89%
1
50.00%
Total
53
100.00%
2
100.00%

/*
 * called in usb_disconnect() or usb_deregister()
 * but only if actconfig(active configuration) exists
 */


static void stub_disconnect(struct usb_device *udev)
{
	struct stub_device *sdev;
	const char *udev_busid = dev_name(&udev->dev);
	struct bus_id_priv *busid_priv;
	int rc;

	dev_dbg(&udev->dev, "Enter\n");

	busid_priv = get_busid_priv(udev_busid);
	if (!busid_priv) {
		BUG();
		return;
	}

	sdev = dev_get_drvdata(&udev->dev);

	/* get stub_device */
	if (!sdev) {
		dev_err(&udev->dev, "could not get device");
		return;
	}

	dev_set_drvdata(&udev->dev, NULL);

	/*
         * NOTE: rx/tx threads are invoked for each usb_device.
         */
	stub_remove_files(&udev->dev);

	/* release port */
	rc = usb_hub_release_port(udev->parent, udev->portnum,
				  (struct usb_dev_state *) udev);
	if (rc) {
		dev_dbg(&udev->dev, "unable to release port\n");
		return;
	}

	/* If usb reset is called from event handler */
	if (usbip_in_eh(current))
		return;

	/* shutdown the current connection */
	shutdown_busid(busid_priv);

	usb_put_dev(sdev->udev);

	/* free sdev */
	busid_priv->sdev = NULL;
	stub_device_free(sdev);

	if (busid_priv->status == STUB_BUSID_ALLOC) {
		busid_priv->status = STUB_BUSID_ADDED;
	} else {
		busid_priv->status = STUB_BUSID_OTHER;
		del_match_busid((char *)udev_busid);
	}
}

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Endre Kollar
84
38.36%
1
11.11%
Valentina Manea
58
26.48%
3
33.33%
Takahiro Hirofuchi
48
21.92%
1
11.11%
Matt Mooney
15
6.85%
1
11.11%
Max Vozeler
7
3.20%
1
11.11%
Bart Westgeest
4
1.83%
1
11.11%
Nobuo Iwata
3
1.37%
1
11.11%
Total
219
100.00%
9
100.00%

#ifdef CONFIG_PM

/* These functions need usb_port_suspend and usb_port_resume,
 * which reside in drivers/usb/core/usb.h. Skip for now. */



static int stub_suspend(struct usb_device *udev, pm_message_t message)
{
	dev_dbg(&udev->dev, "stub_suspend\n");

	return 0;
}

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Arjan Mels
18
66.67%
1
33.33%
Valentina Manea
8
29.63%
1
33.33%
Peter Hüwe
1
3.70%
1
33.33%
Total
27
100.00%
3
100.00%



static int stub_resume(struct usb_device *udev, pm_message_t message)
{
	dev_dbg(&udev->dev, "stub_resume\n");

	return 0;
}

Contributors
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Arjan Mels
18
66.67%
1
33.33%
Valentina Manea
8
29.63%
1
33.33%
Peter Hüwe
1
3.70%
1
33.33%
Total
27
100.00%
3
100.00%

#endif	/* CONFIG_PM */


struct usb_device_driver stub_driver = {
	.name		= "usbip-host",
	.probe		= stub_probe,
	.disconnect	= stub_disconnect,
#ifdef CONFIG_PM
	.suspend	= stub_suspend,
	.resume		= stub_resume,
#endif
	.supports_autosuspend	=	0,
};
Overall Contributors
Person
Tokens
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Commits
CommitProp
Takahiro Hirofuchi
1225
62.44%
1
2.78%
Endre Kollar
208
10.60%
1
2.78%
Valentina Manea
182
9.28%
4
11.11%
Matt Mooney
74
3.77%
4
11.11%
Arjan Mels
54
2.75%
2
5.56%
Alexey Khoroshilov
41
2.09%
1
2.78%
Arnd Bergmann
38
1.94%
1
2.78%
Kurt Kanzenbach
23
1.17%
3
8.33%
Huawei (Harvey) Yang
19
0.97%
2
5.56%
Max Vozeler
17
0.87%
1
2.78%
Navin Patidar
16
0.82%
1
2.78%
Elena Oat
15
0.76%
1
2.78%
Al Viro
10
0.51%
1
2.78%
Vasiliy Kulikov
9
0.46%
1
2.78%
Bart Westgeest
4
0.20%
1
2.78%
Kay Sievers
4
0.20%
1
2.78%
Oleg Nesterov
4
0.20%
1
2.78%
Nobuo Iwata
3
0.15%
1
2.78%
Bernard Blackham
3
0.15%
1
2.78%
Paul Gortmaker
3
0.15%
1
2.78%
Peter Hüwe
2
0.10%
1
2.78%
Tejun Heo
2
0.10%
1
2.78%
Alexander Popov
2
0.10%
1
2.78%
Greg Kroah-Hartman
2
0.10%
1
2.78%
Elad Wexler
1
0.05%
1
2.78%
Akshay Joshi
1
0.05%
1
2.78%
Total
1962
100.00%
36
100.00%
Directory: drivers/usb/usbip

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