/* * 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/kthread.h> #include <linux/module.h> #include "usbip_common.h" #include "stub.h" /* * Define device IDs here if you want to explicitly limit exportable devices. * In most cases, wildcard matching will be okay because driver binding can be * changed dynamically by a userland program. */ static struct usb_device_id stub_table[] = { #if 0 /* just an example */ { USB_DEVICE(0x05ac, 0x0301) }, /* Mac 1 button mouse */ { USB_DEVICE(0x0430, 0x0009) }, /* Plat Home Keyboard */ { USB_DEVICE(0x059b, 0x0001) }, /* Iomega USB Zip 100 */ { USB_DEVICE(0x04b3, 0x4427) }, /* IBM USB CD-ROM */ { USB_DEVICE(0x05a9, 0xa511) }, /* LifeView USB cam */ { USB_DEVICE(0x55aa, 0x0201) }, /* Imation card reader */ { USB_DEVICE(0x046d, 0x0870) }, /* Qcam Express(QV-30) */ { USB_DEVICE(0x04bb, 0x0101) }, /* IO-DATA HD 120GB */ { USB_DEVICE(0x04bb, 0x0904) }, /* IO-DATA USB-ET/TX */ { USB_DEVICE(0x04bb, 0x0201) }, /* IO-DATA USB-ET/TX */ { USB_DEVICE(0x08bb, 0x2702) }, /* ONKYO USB Speaker */ { USB_DEVICE(0x046d, 0x08b2) }, /* Logicool Qcam 4000 Pro */ #endif /* magic for wild card */ { .driver_info = 1 }, { 0, } /* Terminating entry */ }; MODULE_DEVICE_TABLE(usb, stub_table); /* * usbip_status shows the status of usbip-host as long as this driver is bound * to the target device. */ static ssize_t show_status(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(&sdev->ud.lock); status = sdev->ud.status; spin_unlock(&sdev->ud.lock); return snprintf(buf, PAGE_SIZE, "%d\n", status); } static DEVICE_ATTR(usbip_status, S_IRUGO, show_status, NULL); /* * 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; if (!sdev) { dev_err(dev, "sdev is null\n"); return -ENODEV; } sscanf(buf, "%d", &sockfd); if (sockfd != -1) { dev_info(dev, "stub up\n"); spin_lock(&sdev->ud.lock); if (sdev->ud.status != SDEV_ST_AVAILABLE) { dev_err(dev, "not ready\n"); spin_unlock(&sdev->ud.lock); return -EINVAL; } socket = sockfd_to_socket(sockfd); if (!socket) { spin_unlock(&sdev->ud.lock); return -EINVAL; } sdev->ud.tcp_socket = socket; spin_unlock(&sdev->ud.lock); sdev->ud.tcp_rx = kthread_run(stub_rx_loop, &sdev->ud, "stub_rx"); sdev->ud.tcp_tx = kthread_run(stub_tx_loop, &sdev->ud, "stub_tx"); spin_lock(&sdev->ud.lock); sdev->ud.status = SDEV_ST_USED; spin_unlock(&sdev->ud.lock); } else { dev_info(dev, "stub down\n"); spin_lock(&sdev->ud.lock); if (sdev->ud.status != SDEV_ST_USED) { spin_unlock(&sdev->ud.lock); return -EINVAL; } spin_unlock(&sdev->ud.lock); usbip_event_add(&sdev->ud, SDEV_EVENT_DOWN); } return count; } 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; } 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); } 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 && !task_is_dead(ud->tcp_rx)) kthread_stop(ud->tcp_rx); if (ud->tcp_tx && !task_is_dead(ud->tcp_tx)) kthread_stop(ud->tcp_tx); /* * 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) { sock_release(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); } } 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, sdev->interface); if (ret < 0) { dev_err(&udev->dev, "lock for reset\n"); spin_lock(&ud->lock); ud->status = SDEV_ST_ERROR; spin_unlock(&ud->lock); return; } /* try to reset the device */ ret = usb_reset_device(udev); usb_unlock_device(udev); spin_lock(&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(&ud->lock); } static void stub_device_unusable(struct usbip_device *ud) { spin_lock(&ud->lock); ud->status = SDEV_ST_ERROR; spin_unlock(&ud->lock); } /** * stub_device_alloc - allocate a new stub_device struct * @interface: usb_interface of a new device * * Allocates and initializes a new stub_device struct. */ static struct stub_device *stub_device_alloc(struct usb_device *udev, struct usb_interface *interface) { struct stub_device *sdev; int busnum = interface_to_busnum(interface); int devnum = interface_to_devnum(interface); dev_dbg(&interface->dev, "allocating stub device"); /* yes, it's a new device */ sdev = kzalloc(sizeof(struct stub_device), GFP_KERNEL); if (!sdev) { dev_err(&interface->dev, "no memory for stub_device\n"); return NULL; } sdev->interface = usb_get_intf(interface); 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; /* sdev->ud.lock = SPIN_LOCK_UNLOCKED; */ 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); /* sdev->priv_lock = SPIN_LOCK_UNLOCKED; */ 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(&interface->dev, "register new interface\n"); return sdev; } static int stub_device_free(struct stub_device *sdev) { if (!sdev) return -EINVAL; kfree(sdev); pr_debug("kfree udev ok\n"); return 0; } /* * If a usb device has multiple active interfaces, this driver is bound to all * the active interfaces. However, usbip exports *a* usb device (i.e., not *an* * active interface). Currently, a userland program must ensure that it * looks at the usbip's sysfs entries of only the first active interface. * * TODO: use "struct usb_device_driver" to bind a usb device. * However, it seems it is not fully supported in mainline kernel yet * (2.6.19.2). */ static int stub_probe(struct usb_interface *interface, const struct usb_device_id *id) { struct usb_device *udev = interface_to_usbdev(interface); struct stub_device *sdev = NULL; const char *udev_busid = dev_name(interface->dev.parent); int err = 0; struct bus_id_priv *busid_priv; dev_dbg(&interface->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(&interface->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; } if (busid_priv->status == STUB_BUSID_ALLOC) { sdev = busid_priv->sdev; if (!sdev) return -ENODEV; busid_priv->interf_count++; dev_info(&interface->dev, "usbip-host: register new interface " "(bus %u dev %u ifn %u)\n", udev->bus->busnum, udev->devnum, interface->cur_altsetting->desc.bInterfaceNumber); /* set private data to usb_interface */ usb_set_intfdata(interface, sdev); err = stub_add_files(&interface->dev); if (err) { dev_err(&interface->dev, "stub_add_files for %s\n", udev_busid); usb_set_intfdata(interface, NULL); busid_priv->interf_count--; return err; } usb_get_intf(interface); return 0; } /* ok, this is my device */ sdev = stub_device_alloc(udev, interface); if (!sdev) return -ENOMEM; dev_info(&interface->dev, "usbip-host: register new device " "(bus %u dev %u ifn %u)\n", udev->bus->busnum, udev->devnum, interface->cur_altsetting->desc.bInterfaceNumber); busid_priv->interf_count = 0; busid_priv->shutdown_busid = 0; /* set private data to usb_interface */ usb_set_intfdata(interface, sdev); busid_priv->interf_count++; busid_priv->sdev = sdev; err = stub_add_files(&interface->dev); if (err) { dev_err(&interface->dev, "stub_add_files for %s\n", udev_busid); usb_set_intfdata(interface, NULL); usb_put_intf(interface); busid_priv->interf_count = 0; busid_priv->sdev = NULL; stub_device_free(sdev); return err; } busid_priv->status = STUB_BUSID_ALLOC; return 0; } 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); /* 2. wait for the stop of the event handler */ usbip_stop_eh(&busid_priv->sdev->ud); } } /* * called in usb_disconnect() or usb_deregister() * but only if actconfig(active configuration) exists */ static void stub_disconnect(struct usb_interface *interface) { struct stub_device *sdev; const char *udev_busid = dev_name(interface->dev.parent); struct bus_id_priv *busid_priv; dev_dbg(&interface->dev, "Enter\n"); busid_priv = get_busid_priv(udev_busid); if (!busid_priv) { BUG(); return; } sdev = usb_get_intfdata(interface); /* get stub_device */ if (!sdev) { dev_err(&interface->dev, "could not get device"); /* BUG(); */ return; } usb_set_intfdata(interface, NULL); /* * NOTE: * rx/tx threads are invoked for each usb_device. */ stub_remove_files(&interface->dev); /*If usb reset called from event handler*/ if (busid_priv->sdev->ud.eh == current) { busid_priv->interf_count--; return; } if (busid_priv->interf_count > 1) { busid_priv->interf_count--; shutdown_busid(busid_priv); usb_put_intf(interface); return; } busid_priv->interf_count = 0; /* 1. shutdown the current connection */ shutdown_busid(busid_priv); usb_put_dev(sdev->udev); usb_put_intf(interface); /* 3. 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); } } /* * Presence of pre_reset and post_reset prevents the driver from being unbound * when the device is being reset */ int stub_pre_reset(struct usb_interface *interface) { dev_dbg(&interface->dev, "pre_reset\n"); return 0; } int stub_post_reset(struct usb_interface *interface) { dev_dbg(&interface->dev, "post_reset\n"); return 0; } struct usb_driver stub_driver = { .name = "usbip-host", .probe = stub_probe, .disconnect = stub_disconnect, .id_table = stub_table, .pre_reset = stub_pre_reset, .post_reset = stub_post_reset, };