diff options
Diffstat (limited to 'drivers/staging/usbip/vhci_hcd.c')
| -rw-r--r-- | drivers/staging/usbip/vhci_hcd.c | 1171 |
1 files changed, 0 insertions, 1171 deletions
diff --git a/drivers/staging/usbip/vhci_hcd.c b/drivers/staging/usbip/vhci_hcd.c deleted file mode 100644 index c02374b6049c..000000000000 --- a/drivers/staging/usbip/vhci_hcd.c +++ /dev/null @@ -1,1171 +0,0 @@ -/* - * 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/init.h> -#include <linux/file.h> -#include <linux/kernel.h> -#include <linux/kthread.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/slab.h> - -#include "usbip_common.h" -#include "vhci.h" - -#define DRIVER_AUTHOR "Takahiro Hirofuchi" -#define DRIVER_DESC "USB/IP 'Virtual' Host Controller (VHCI) Driver" - -/* - * TODO - * - update root hub emulation - * - move the emulation code to userland ? - * porting to other operating systems - * minimize kernel code - * - add suspend/resume code - * - clean up everything - */ - -/* See usb gadget dummy hcd */ - -static int vhci_hub_status(struct usb_hcd *hcd, char *buff); -static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, - u16 wIndex, char *buff, u16 wLength); -static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, - gfp_t mem_flags); -static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status); -static int vhci_start(struct usb_hcd *vhci_hcd); -static void vhci_stop(struct usb_hcd *hcd); -static int vhci_get_frame_number(struct usb_hcd *hcd); - -static const char driver_name[] = "vhci_hcd"; -static const char driver_desc[] = "USB/IP Virtual Host Controller"; - -struct vhci_hcd *the_controller; - -static const char * const bit_desc[] = { - "CONNECTION", /*0*/ - "ENABLE", /*1*/ - "SUSPEND", /*2*/ - "OVER_CURRENT", /*3*/ - "RESET", /*4*/ - "R5", /*5*/ - "R6", /*6*/ - "R7", /*7*/ - "POWER", /*8*/ - "LOWSPEED", /*9*/ - "HIGHSPEED", /*10*/ - "PORT_TEST", /*11*/ - "INDICATOR", /*12*/ - "R13", /*13*/ - "R14", /*14*/ - "R15", /*15*/ - "C_CONNECTION", /*16*/ - "C_ENABLE", /*17*/ - "C_SUSPEND", /*18*/ - "C_OVER_CURRENT", /*19*/ - "C_RESET", /*20*/ - "R21", /*21*/ - "R22", /*22*/ - "R23", /*23*/ - "R24", /*24*/ - "R25", /*25*/ - "R26", /*26*/ - "R27", /*27*/ - "R28", /*28*/ - "R29", /*29*/ - "R30", /*30*/ - "R31", /*31*/ -}; - -static void dump_port_status_diff(u32 prev_status, u32 new_status) -{ - int i = 0; - u32 bit = 1; - - pr_debug("status prev -> new: %08x -> %08x\n", prev_status, new_status); - while (bit) { - u32 prev = prev_status & bit; - u32 new = new_status & bit; - char change; - - if (!prev && new) - change = '+'; - else if (prev && !new) - change = '-'; - else - change = ' '; - - if (prev || new) - pr_debug(" %c%s\n", change, bit_desc[i]); - bit <<= 1; - i++; - } - pr_debug("\n"); -} - -void rh_port_connect(int rhport, enum usb_device_speed speed) -{ - usbip_dbg_vhci_rh("rh_port_connect %d\n", rhport); - - spin_lock(&the_controller->lock); - - the_controller->port_status[rhport] |= USB_PORT_STAT_CONNECTION - | (1 << USB_PORT_FEAT_C_CONNECTION); - - switch (speed) { - case USB_SPEED_HIGH: - the_controller->port_status[rhport] |= USB_PORT_STAT_HIGH_SPEED; - break; - case USB_SPEED_LOW: - the_controller->port_status[rhport] |= USB_PORT_STAT_LOW_SPEED; - break; - default: - break; - } - - spin_unlock(&the_controller->lock); - - usb_hcd_poll_rh_status(vhci_to_hcd(the_controller)); -} - -static void rh_port_disconnect(int rhport) -{ - usbip_dbg_vhci_rh("rh_port_disconnect %d\n", rhport); - - spin_lock(&the_controller->lock); - - the_controller->port_status[rhport] &= ~USB_PORT_STAT_CONNECTION; - the_controller->port_status[rhport] |= - (1 << USB_PORT_FEAT_C_CONNECTION); - - spin_unlock(&the_controller->lock); - usb_hcd_poll_rh_status(vhci_to_hcd(the_controller)); -} - -#define PORT_C_MASK \ - ((USB_PORT_STAT_C_CONNECTION \ - | USB_PORT_STAT_C_ENABLE \ - | USB_PORT_STAT_C_SUSPEND \ - | USB_PORT_STAT_C_OVERCURRENT \ - | USB_PORT_STAT_C_RESET) << 16) - -/* - * Returns 0 if the status hasn't changed, or the number of bytes in buf. - * Ports are 0-indexed from the HCD point of view, - * and 1-indexed from the USB core pointer of view. - * - * @buf: a bitmap to show which port status has been changed. - * bit 0: reserved - * bit 1: the status of port 0 has been changed. - * bit 2: the status of port 1 has been changed. - * ... - */ -static int vhci_hub_status(struct usb_hcd *hcd, char *buf) -{ - struct vhci_hcd *vhci; - int retval; - int rhport; - int changed = 0; - - retval = DIV_ROUND_UP(VHCI_NPORTS + 1, 8); - memset(buf, 0, retval); - - vhci = hcd_to_vhci(hcd); - - spin_lock(&vhci->lock); - if (!HCD_HW_ACCESSIBLE(hcd)) { - usbip_dbg_vhci_rh("hw accessible flag not on?\n"); - goto done; - } - - /* check pseudo status register for each port */ - for (rhport = 0; rhport < VHCI_NPORTS; rhport++) { - if ((vhci->port_status[rhport] & PORT_C_MASK)) { - /* The status of a port has been changed, */ - usbip_dbg_vhci_rh("port %d status changed\n", rhport); - - buf[(rhport + 1) / 8] |= 1 << (rhport + 1) % 8; - changed = 1; - } - } - - if ((hcd->state == HC_STATE_SUSPENDED) && (changed == 1)) - usb_hcd_resume_root_hub(hcd); - -done: - spin_unlock(&vhci->lock); - return changed ? retval : 0; -} - -static inline void hub_descriptor(struct usb_hub_descriptor *desc) -{ - memset(desc, 0, sizeof(*desc)); - desc->bDescriptorType = 0x29; - desc->bDescLength = 9; - desc->wHubCharacteristics = (__constant_cpu_to_le16(0x0001)); - desc->bNbrPorts = VHCI_NPORTS; - desc->u.hs.DeviceRemovable[0] = 0xff; - desc->u.hs.DeviceRemovable[1] = 0xff; -} - -static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, - u16 wIndex, char *buf, u16 wLength) -{ - struct vhci_hcd *dum; - int retval = 0; - int rhport; - - u32 prev_port_status[VHCI_NPORTS]; - - if (!HCD_HW_ACCESSIBLE(hcd)) - return -ETIMEDOUT; - - /* - * NOTE: - * wIndex shows the port number and begins from 1. - */ - usbip_dbg_vhci_rh("typeReq %x wValue %x wIndex %x\n", typeReq, wValue, - wIndex); - if (wIndex > VHCI_NPORTS) - pr_err("invalid port number %d\n", wIndex); - rhport = ((__u8)(wIndex & 0x00ff)) - 1; - - dum = hcd_to_vhci(hcd); - - spin_lock(&dum->lock); - - /* store old status and compare now and old later */ - if (usbip_dbg_flag_vhci_rh) { - memcpy(prev_port_status, dum->port_status, - sizeof(prev_port_status)); - } - - switch (typeReq) { - case ClearHubFeature: - usbip_dbg_vhci_rh(" ClearHubFeature\n"); - break; - case ClearPortFeature: - switch (wValue) { - case USB_PORT_FEAT_SUSPEND: - if (dum->port_status[rhport] & USB_PORT_STAT_SUSPEND) { - /* 20msec signaling */ - dum->resuming = 1; - dum->re_timeout = - jiffies + msecs_to_jiffies(20); - } - break; - case USB_PORT_FEAT_POWER: - usbip_dbg_vhci_rh( - " ClearPortFeature: USB_PORT_FEAT_POWER\n"); - dum->port_status[rhport] = 0; - dum->resuming = 0; - break; - case USB_PORT_FEAT_C_RESET: - usbip_dbg_vhci_rh( - " ClearPortFeature: USB_PORT_FEAT_C_RESET\n"); - switch (dum->vdev[rhport].speed) { - case USB_SPEED_HIGH: - dum->port_status[rhport] |= - USB_PORT_STAT_HIGH_SPEED; - break; - case USB_SPEED_LOW: - dum->port_status[rhport] |= - USB_PORT_STAT_LOW_SPEED; - break; - default: - break; - } - default: - usbip_dbg_vhci_rh(" ClearPortFeature: default %x\n", - wValue); - dum->port_status[rhport] &= ~(1 << wValue); - break; - } - break; - case GetHubDescriptor: - usbip_dbg_vhci_rh(" GetHubDescriptor\n"); - hub_descriptor((struct usb_hub_descriptor *) buf); - break; - case GetHubStatus: - usbip_dbg_vhci_rh(" GetHubStatus\n"); - *(__le32 *) buf = cpu_to_le32(0); - break; - case GetPortStatus: - usbip_dbg_vhci_rh(" GetPortStatus port %x\n", wIndex); - if (wIndex > VHCI_NPORTS || wIndex < 1) { - pr_err("invalid port number %d\n", wIndex); - retval = -EPIPE; - } - - /* we do not care about resume. */ - - /* whoever resets or resumes must GetPortStatus to - * complete it!! - */ - if (dum->resuming && time_after(jiffies, dum->re_timeout)) { - dum->port_status[rhport] |= - (1 << USB_PORT_FEAT_C_SUSPEND); - dum->port_status[rhport] &= - ~(1 << USB_PORT_FEAT_SUSPEND); - dum->resuming = 0; - dum->re_timeout = 0; - } - - if ((dum->port_status[rhport] & (1 << USB_PORT_FEAT_RESET)) != - 0 && time_after(jiffies, dum->re_timeout)) { - dum->port_status[rhport] |= - (1 << USB_PORT_FEAT_C_RESET); - dum->port_status[rhport] &= - ~(1 << USB_PORT_FEAT_RESET); - dum->re_timeout = 0; - - if (dum->vdev[rhport].ud.status == - VDEV_ST_NOTASSIGNED) { - usbip_dbg_vhci_rh( - " enable rhport %d (status %u)\n", - rhport, - dum->vdev[rhport].ud.status); - dum->port_status[rhport] |= - USB_PORT_STAT_ENABLE; - } - } - ((__le16 *) buf)[0] = cpu_to_le16(dum->port_status[rhport]); - ((__le16 *) buf)[1] = - cpu_to_le16(dum->port_status[rhport] >> 16); - - usbip_dbg_vhci_rh(" GetPortStatus bye %x %x\n", ((u16 *)buf)[0], - ((u16 *)buf)[1]); - break; - case SetHubFeature: - usbip_dbg_vhci_rh(" SetHubFeature\n"); - retval = -EPIPE; - break; - case SetPortFeature: - switch (wValue) { - case USB_PORT_FEAT_SUSPEND: - usbip_dbg_vhci_rh( - " SetPortFeature: USB_PORT_FEAT_SUSPEND\n"); - break; - case USB_PORT_FEAT_RESET: - usbip_dbg_vhci_rh( - " SetPortFeature: USB_PORT_FEAT_RESET\n"); - /* if it's already running, disconnect first */ - if (dum->port_status[rhport] & USB_PORT_STAT_ENABLE) { - dum->port_status[rhport] &= - ~(USB_PORT_STAT_ENABLE | - USB_PORT_STAT_LOW_SPEED | - USB_PORT_STAT_HIGH_SPEED); - /* FIXME test that code path! */ - } - /* 50msec reset signaling */ - dum->re_timeout = jiffies + msecs_to_jiffies(50); - - /* FALLTHROUGH */ - default: - usbip_dbg_vhci_rh(" SetPortFeature: default %d\n", - wValue); - dum->port_status[rhport] |= (1 << wValue); - break; - } - break; - - default: - pr_err("default: no such request\n"); - - /* "protocol stall" on error */ - retval = -EPIPE; - } - - if (usbip_dbg_flag_vhci_rh) { - pr_debug("port %d\n", rhport); - /* Only dump valid port status */ - if (rhport >= 0) { - dump_port_status_diff(prev_port_status[rhport], - dum->port_status[rhport]); - } - } - usbip_dbg_vhci_rh(" bye\n"); - - spin_unlock(&dum->lock); - - return retval; -} - -static struct vhci_device *get_vdev(struct usb_device *udev) -{ - int i; - - if (!udev) - return NULL; - - for (i = 0; i < VHCI_NPORTS; i++) - if (the_controller->vdev[i].udev == udev) - return port_to_vdev(i); - - return NULL; -} - -static void vhci_tx_urb(struct urb *urb) -{ - struct vhci_device *vdev = get_vdev(urb->dev); - struct vhci_priv *priv; - - if (!vdev) { - pr_err("could not get virtual device"); - return; - } - - priv = kzalloc(sizeof(struct vhci_priv), GFP_ATOMIC); - if (!priv) { - usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC); - return; - } - - spin_lock(&vdev->priv_lock); - - priv->seqnum = atomic_inc_return(&the_controller->seqnum); - if (priv->seqnum == 0xffff) - dev_info(&urb->dev->dev, "seqnum max\n"); - - priv->vdev = vdev; - priv->urb = urb; - - urb->hcpriv = (void *) priv; - - list_add_tail(&priv->list, &vdev->priv_tx); - - wake_up(&vdev->waitq_tx); - spin_unlock(&vdev->priv_lock); -} - -static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, - gfp_t mem_flags) -{ - struct device *dev = &urb->dev->dev; - int ret = 0; - struct vhci_device *vdev; - - usbip_dbg_vhci_hc("enter, usb_hcd %p urb %p mem_flags %d\n", - hcd, urb, mem_flags); - - /* patch to usb_sg_init() is in 2.5.60 */ - BUG_ON(!urb->transfer_buffer && urb->transfer_buffer_length); - - spin_lock(&the_controller->lock); - - if (urb->status != -EINPROGRESS) { - dev_err(dev, "URB already unlinked!, status %d\n", urb->status); - spin_unlock(&the_controller->lock); - return urb->status; - } - - vdev = port_to_vdev(urb->dev->portnum-1); - - /* refuse enqueue for dead connection */ - spin_lock(&vdev->ud.lock); - if (vdev->ud.status == VDEV_ST_NULL || - vdev->ud.status == VDEV_ST_ERROR) { - dev_err(dev, "enqueue for inactive port %d\n", vdev->rhport); - spin_unlock(&vdev->ud.lock); - spin_unlock(&the_controller->lock); - return -ENODEV; - } - spin_unlock(&vdev->ud.lock); - - ret = usb_hcd_link_urb_to_ep(hcd, urb); - if (ret) - goto no_need_unlink; - - /* - * The enumeration process is as follows; - * - * 1. Get_Descriptor request to DevAddrs(0) EndPoint(0) - * to get max packet length of default pipe - * - * 2. Set_Address request to DevAddr(0) EndPoint(0) - * - */ - if (usb_pipedevice(urb->pipe) == 0) { - __u8 type = usb_pipetype(urb->pipe); - struct usb_ctrlrequest *ctrlreq = - (struct usb_ctrlrequest *) urb->setup_packet; - - if (type != PIPE_CONTROL || !ctrlreq) { - dev_err(dev, "invalid request to devnum 0\n"); - ret = -EINVAL; - goto no_need_xmit; - } - - switch (ctrlreq->bRequest) { - case USB_REQ_SET_ADDRESS: - /* set_address may come when a device is reset */ - dev_info(dev, "SetAddress Request (%d) to port %d\n", - ctrlreq->wValue, vdev->rhport); - - if (vdev->udev) - usb_put_dev(vdev->udev); - vdev->udev = usb_get_dev(urb->dev); - - spin_lock(&vdev->ud.lock); - vdev->ud.status = VDEV_ST_USED; - spin_unlock(&vdev->ud.lock); - - if (urb->status == -EINPROGRESS) { - /* This request is successfully completed. */ - /* If not -EINPROGRESS, possibly unlinked. */ - urb->status = 0; - } - - goto no_need_xmit; - - case USB_REQ_GET_DESCRIPTOR: - if (ctrlreq->wValue == cpu_to_le16(USB_DT_DEVICE << 8)) - usbip_dbg_vhci_hc( - "Not yet?:Get_Descriptor to device 0 (get max pipe size)\n"); - - if (vdev->udev) - usb_put_dev(vdev->udev); - vdev->udev = usb_get_dev(urb->dev); - goto out; - - default: - /* NOT REACHED */ - dev_err(dev, - "invalid request to devnum 0 bRequest %u, wValue %u\n", - ctrlreq->bRequest, - ctrlreq->wValue); - ret = -EINVAL; - goto no_need_xmit; - } - - } - -out: - vhci_tx_urb(urb); - spin_unlock(&the_controller->lock); - - return 0; - -no_need_xmit: - usb_hcd_unlink_urb_from_ep(hcd, urb); -no_need_unlink: - spin_unlock(&the_controller->lock); - usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status); - return ret; -} - -/* - * vhci_rx gives back the urb after receiving the reply of the urb. If an - * unlink pdu is sent or not, vhci_rx receives a normal return pdu and gives - * back its urb. For the driver unlinking the urb, the content of the urb is - * not important, but the calling to its completion handler is important; the - * completion of unlinking is notified by the completion handler. - * - * - * CLIENT SIDE - * - * - When vhci_hcd receives RET_SUBMIT, - * - * - case 1a). the urb of the pdu is not unlinking. - * - normal case - * => just give back the urb - * - * - case 1b). the urb of the pdu is unlinking. - * - usbip.ko will return a reply of the unlinking request. - * => give back the urb now and go to case 2b). - * - * - When vhci_hcd receives RET_UNLINK, - * - * - case 2a). a submit request is still pending in vhci_hcd. - * - urb was really pending in usbip.ko and urb_unlink_urb() was - * completed there. - * => free a pending submit request - * => notify unlink completeness by giving back the urb - * - * - case 2b). a submit request is *not* pending in vhci_hcd. - * - urb was already given back to the core driver. - * => do not give back the urb - * - * - * SERVER SIDE - * - * - When usbip receives CMD_UNLINK, - * - * - case 3a). the urb of the unlink request is now in submission. - * => do usb_unlink_urb(). - * => after the unlink is completed, send RET_UNLINK. - * - * - case 3b). the urb of the unlink request is not in submission. - * - may be already completed or never be received - * => send RET_UNLINK - * - */ -static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) -{ - struct vhci_priv *priv; - struct vhci_device *vdev; - - pr_info("dequeue a urb %p\n", urb); - - spin_lock(&the_controller->lock); - - priv = urb->hcpriv; - if (!priv) { - /* URB was never linked! or will be soon given back by - * vhci_rx. */ - spin_unlock(&the_controller->lock); - return 0; - } - - { - int ret = 0; - - ret = usb_hcd_check_unlink_urb(hcd, urb, status); - if (ret) { - spin_unlock(&the_controller->lock); - return ret; - } - } - - /* send unlink request here? */ - vdev = priv->vdev; - - if (!vdev->ud.tcp_socket) { - /* tcp connection is closed */ - spin_lock(&vdev->priv_lock); - - pr_info("device %p seems to be disconnected\n", vdev); - list_del(&priv->list); - kfree(priv); - urb->hcpriv = NULL; - - spin_unlock(&vdev->priv_lock); - - /* - * If tcp connection is alive, we have sent CMD_UNLINK. - * vhci_rx will receive RET_UNLINK and give back the URB. - * Otherwise, we give back it here. - */ - pr_info("gives back urb %p\n", urb); - - usb_hcd_unlink_urb_from_ep(hcd, urb); - - spin_unlock(&the_controller->lock); - usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, - urb->status); - spin_lock(&the_controller->lock); - - } else { - /* tcp connection is alive */ - struct vhci_unlink *unlink; - - spin_lock(&vdev->priv_lock); - - /* setup CMD_UNLINK pdu */ - unlink = kzalloc(sizeof(struct vhci_unlink), GFP_ATOMIC); - if (!unlink) { - spin_unlock(&vdev->priv_lock); - spin_unlock(&the_controller->lock); - usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC); - return -ENOMEM; - } - - unlink->seqnum = atomic_inc_return(&the_controller->seqnum); - if (unlink->seqnum == 0xffff) - pr_info("seqnum max\n"); - - unlink->unlink_seqnum = priv->seqnum; - - pr_info("device %p seems to be still connected\n", vdev); - - /* send cmd_unlink and try to cancel the pending URB in the - * peer */ - list_add_tail(&unlink->list, &vdev->unlink_tx); - wake_up(&vdev->waitq_tx); - - spin_unlock(&vdev->priv_lock); - } - - spin_unlock(&the_controller->lock); - - usbip_dbg_vhci_hc("leave\n"); - return 0; -} - -static void vhci_device_unlink_cleanup(struct vhci_device *vdev) -{ - struct vhci_unlink *unlink, *tmp; - - spin_lock(&the_controller->lock); - spin_lock(&vdev->priv_lock); - - list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) { - pr_info("unlink cleanup tx %lu\n", unlink->unlink_seqnum); - list_del(&unlink->list); - kfree(unlink); - } - - while (!list_empty(&vdev->unlink_rx)) { - struct urb *urb; - - unlink = list_first_entry(&vdev->unlink_rx, struct vhci_unlink, - list); - - /* give back URB of unanswered unlink request */ - pr_info("unlink cleanup rx %lu\n", unlink->unlink_seqnum); - - urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum); - if (!urb) { - pr_info("the urb (seqnum %lu) was already given back\n", - unlink->unlink_seqnum); - list_del(&unlink->list); - kfree(unlink); - continue; - } - - urb->status = -ENODEV; - - usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb); - - list_del(&unlink->list); - - spin_unlock(&vdev->priv_lock); - spin_unlock(&the_controller->lock); - - usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, - urb->status); - - spin_lock(&the_controller->lock); - spin_lock(&vdev->priv_lock); - - kfree(unlink); - } - - spin_unlock(&vdev->priv_lock); - spin_unlock(&the_controller->lock); -} - -/* - * The important thing is that only one context begins cleanup. - * This is why error handling and cleanup become simple. - * We do not want to consider race condition as possible. - */ -static void vhci_shutdown_connection(struct usbip_device *ud) -{ - struct vhci_device *vdev = container_of(ud, struct vhci_device, ud); - - /* need this? see stub_dev.c */ - if (ud->tcp_socket) { - pr_debug("shutdown tcp_socket %p\n", ud->tcp_socket); - kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR); - } - - /* kill threads related to this sdev */ - if (vdev->ud.tcp_rx) { - kthread_stop_put(vdev->ud.tcp_rx); - vdev->ud.tcp_rx = NULL; - } - if (vdev->ud.tcp_tx) { - kthread_stop_put(vdev->ud.tcp_tx); - vdev->ud.tcp_tx = NULL; - } - pr_info("stop threads\n"); - - /* active connection is closed */ - if (vdev->ud.tcp_socket) { - sockfd_put(vdev->ud.tcp_socket); - vdev->ud.tcp_socket = NULL; - } - pr_info("release socket\n"); - - vhci_device_unlink_cleanup(vdev); - - /* - * rh_port_disconnect() is a trigger of ... - * usb_disable_device(): - * disable all the endpoints for a USB device. - * usb_disable_endpoint(): - * disable endpoints. pending urbs are unlinked(dequeued). - * - * NOTE: After calling rh_port_disconnect(), the USB device drivers of a - * detached device should release used urbs in a cleanup function (i.e. - * xxx_disconnect()). Therefore, vhci_hcd does not need to release - * pushed urbs and their private data in this function. - * - * NOTE: vhci_dequeue() must be considered carefully. When shutting down - * a connection, vhci_shutdown_connection() expects vhci_dequeue() - * gives back pushed urbs and frees their private data by request of - * the cleanup function of a USB driver. When unlinking a urb with an - * active connection, vhci_dequeue() does not give back the urb which - * is actually given back by vhci_rx after receiving its return pdu. - * - */ - rh_port_disconnect(vdev->rhport); - - pr_info("disconnect device\n"); -} - - -static void vhci_device_reset(struct usbip_device *ud) -{ - struct vhci_device *vdev = container_of(ud, struct vhci_device, ud); - - spin_lock(&ud->lock); - - vdev->speed = 0; - vdev->devid = 0; - - if (vdev->udev) - usb_put_dev(vdev->udev); - vdev->udev = NULL; - - if (ud->tcp_socket) { - sockfd_put(ud->tcp_socket); - ud->tcp_socket = NULL; - } - ud->status = VDEV_ST_NULL; - - spin_unlock(&ud->lock); -} - -static void vhci_device_unusable(struct usbip_device *ud) -{ - spin_lock(&ud->lock); - ud->status = VDEV_ST_ERROR; - spin_unlock(&ud->lock); -} - -static void vhci_device_init(struct vhci_device *vdev) -{ - memset(vdev, 0, sizeof(*vdev)); - - vdev->ud.side = USBIP_VHCI; - vdev->ud.status = VDEV_ST_NULL; - spin_lock_init(&vdev->ud.lock); - - INIT_LIST_HEAD(&vdev->priv_rx); - INIT_LIST_HEAD(&vdev->priv_tx); - INIT_LIST_HEAD(&vdev->unlink_tx); - INIT_LIST_HEAD(&vdev->unlink_rx); - spin_lock_init(&vdev->priv_lock); - - init_waitqueue_head(&vdev->waitq_tx); - - vdev->ud.eh_ops.shutdown = vhci_shutdown_connection; - vdev->ud.eh_ops.reset = vhci_device_reset; - vdev->ud.eh_ops.unusable = vhci_device_unusable; - - usbip_start_eh(&vdev->ud); -} - -static int vhci_start(struct usb_hcd *hcd) -{ - struct vhci_hcd *vhci = hcd_to_vhci(hcd); - int rhport; - int err = 0; - - usbip_dbg_vhci_hc("enter vhci_start\n"); - - /* initialize private data of usb_hcd */ - - for (rhport = 0; rhport < VHCI_NPORTS; rhport++) { - struct vhci_device *vdev = &vhci->vdev[rhport]; - - vhci_device_init(vdev); - vdev->rhport = rhport; - } - - atomic_set(&vhci->seqnum, 0); - spin_lock_init(&vhci->lock); - - hcd->power_budget = 0; /* no limit */ - hcd->uses_new_polling = 1; - - /* vhci_hcd is now ready to be controlled through sysfs */ - err = sysfs_create_group(&vhci_dev(vhci)->kobj, &dev_attr_group); - if (err) { - pr_err("create sysfs files\n"); - return err; - } - - return 0; -} - -static void vhci_stop(struct usb_hcd *hcd) -{ - struct vhci_hcd *vhci = hcd_to_vhci(hcd); - int rhport = 0; - - usbip_dbg_vhci_hc("stop VHCI controller\n"); - - /* 1. remove the userland interface of vhci_hcd */ - sysfs_remove_group(&vhci_dev(vhci)->kobj, &dev_attr_group); - - /* 2. shutdown all the ports of vhci_hcd */ - for (rhport = 0; rhport < VHCI_NPORTS; rhport++) { - struct vhci_device *vdev = &vhci->vdev[rhport]; - - usbip_event_add(&vdev->ud, VDEV_EVENT_REMOVED); - usbip_stop_eh(&vdev->ud); - } -} - -static int vhci_get_frame_number(struct usb_hcd *hcd) -{ - pr_err("Not yet implemented\n"); - return 0; -} - -#ifdef CONFIG_PM - -/* FIXME: suspend/resume */ -static int vhci_bus_suspend(struct usb_hcd *hcd) -{ - struct vhci_hcd *vhci = hcd_to_vhci(hcd); - - dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); - - spin_lock(&vhci->lock); - hcd->state = HC_STATE_SUSPENDED; - spin_unlock(&vhci->lock); - - return 0; -} - -static int vhci_bus_resume(struct usb_hcd *hcd) -{ - struct vhci_hcd *vhci = hcd_to_vhci(hcd); - int rc = 0; - - dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); - - spin_lock(&vhci->lock); - if (!HCD_HW_ACCESSIBLE(hcd)) - rc = -ESHUTDOWN; - else - hcd->state = HC_STATE_RUNNING; - spin_unlock(&vhci->lock); - - return rc; -} - -#else - -#define vhci_bus_suspend NULL -#define vhci_bus_resume NULL -#endif - -static struct hc_driver vhci_hc_driver = { - .description = driver_name, - .product_desc = driver_desc, - .hcd_priv_size = sizeof(struct vhci_hcd), - - .flags = HCD_USB2, - - .start = vhci_start, - .stop = vhci_stop, - - .urb_enqueue = vhci_urb_enqueue, - .urb_dequeue = vhci_urb_dequeue, - - .get_frame_number = vhci_get_frame_number, - - .hub_status_data = vhci_hub_status, - .hub_control = vhci_hub_control, - .bus_suspend = vhci_bus_suspend, - .bus_resume = vhci_bus_resume, -}; - -static int vhci_hcd_probe(struct platform_device *pdev) -{ - struct usb_hcd *hcd; - int ret; - - usbip_dbg_vhci_hc("name %s id %d\n", pdev->name, pdev->id); - - /* - * Allocate and initialize hcd. - * Our private data is also allocated automatically. - */ - hcd = usb_create_hcd(&vhci_hc_driver, &pdev->dev, dev_name(&pdev->dev)); - if (!hcd) { - pr_err("create hcd failed\n"); - return -ENOMEM; - } - hcd->has_tt = 1; - - /* this is private data for vhci_hcd */ - the_controller = hcd_to_vhci(hcd); - - /* - * Finish generic HCD structure initialization and register. - * Call the driver's reset() and start() routines. - */ - ret = usb_add_hcd(hcd, 0, 0); - if (ret != 0) { - pr_err("usb_add_hcd failed %d\n", ret); - usb_put_hcd(hcd); - the_controller = NULL; - return ret; - } - - usbip_dbg_vhci_hc("bye\n"); - return 0; -} - -static int vhci_hcd_remove(struct platform_device *pdev) -{ - struct usb_hcd *hcd; - - hcd = platform_get_drvdata(pdev); - if (!hcd) - return 0; - - /* - * Disconnects the root hub, - * then reverses the effects of usb_add_hcd(), - * invoking the HCD's stop() methods. - */ - usb_remove_hcd(hcd); - usb_put_hcd(hcd); - the_controller = NULL; - - return 0; -} - -#ifdef CONFIG_PM - -/* what should happen for USB/IP under suspend/resume? */ -static int vhci_hcd_suspend(struct platform_device *pdev, pm_message_t state) -{ - struct usb_hcd *hcd; - int rhport = 0; - int connected = 0; - int ret = 0; - - hcd = platform_get_drvdata(pdev); - - spin_lock(&the_controller->lock); - - for (rhport = 0; rhport < VHCI_NPORTS; rhport++) - if (the_controller->port_status[rhport] & - USB_PORT_STAT_CONNECTION) - connected += 1; - - spin_unlock(&the_controller->lock); - - if (connected > 0) { - dev_info(&pdev->dev, - "We have %d active connection%s. Do not suspend.\n", - connected, (connected == 1 ? "" : "s")); - ret = -EBUSY; - } else { - dev_info(&pdev->dev, "suspend vhci_hcd"); - clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); - } - - return ret; -} - -static int vhci_hcd_resume(struct platform_device *pdev) -{ - struct usb_hcd *hcd; - - dev_dbg(&pdev->dev, "%s\n", __func__); - - hcd = platform_get_drvdata(pdev); - set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); - usb_hcd_poll_rh_status(hcd); - - return 0; -} - -#else - -#define vhci_hcd_suspend NULL -#define vhci_hcd_resume NULL - -#endif - -static struct platform_driver vhci_driver = { - .probe = vhci_hcd_probe, - .remove = vhci_hcd_remove, - .suspend = vhci_hcd_suspend, - .resume = vhci_hcd_resume, - .driver = { - .name = driver_name, - .owner = THIS_MODULE, - }, -}; - -/* - * The VHCI 'device' is 'virtual'; not a real plug&play hardware. - * We need to add this virtual device as a platform device arbitrarily: - * 1. platform_device_register() - */ -static void the_pdev_release(struct device *dev) -{ -} - -static struct platform_device the_pdev = { - /* should be the same name as driver_name */ - .name = driver_name, - .id = -1, - .dev = { - .release = the_pdev_release, - }, -}; - -static int __init vhci_hcd_init(void) -{ - int ret; - - if (usb_disabled()) - return -ENODEV; - - ret = platform_driver_register(&vhci_driver); - if (ret) - goto err_driver_register; - - ret = platform_device_register(&the_pdev); - if (ret) - goto err_platform_device_register; - - pr_info(DRIVER_DESC " v" USBIP_VERSION "\n"); - return ret; - -err_platform_device_register: - platform_driver_unregister(&vhci_driver); -err_driver_register: - return ret; -} - -static void __exit vhci_hcd_exit(void) -{ - platform_device_unregister(&the_pdev); - platform_driver_unregister(&vhci_driver); -} - -module_init(vhci_hcd_init); -module_exit(vhci_hcd_exit); - -MODULE_AUTHOR(DRIVER_AUTHOR); -MODULE_DESCRIPTION(DRIVER_DESC); -MODULE_LICENSE("GPL"); -MODULE_VERSION(USBIP_VERSION); |