alistair23-linux/drivers/usb/usbip/vhci_hcd.c
Greg Kroah-Hartman 083d5ad1a9 usbip: rate limit get_frame_number message
It's annoying to constantly see the same "Not yet implemented" message
over and over with nothing able to be done about it, so rate limit it
for now to keep user's logs "clean".

Reported-by: Lars Täuber <lars.taeuber@web.de>
Tested-by: Lars Täuber <lars.taeuber@web.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-06-17 18:00:46 -07:00

1187 lines
28 KiB
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/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)
{
unsigned long flags;
usbip_dbg_vhci_rh("rh_port_connect %d\n", rhport);
spin_lock_irqsave(&the_controller->lock, flags);
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_irqrestore(&the_controller->lock, flags);
usb_hcd_poll_rh_status(vhci_to_hcd(the_controller));
}
static void rh_port_disconnect(int rhport)
{
unsigned long flags;
usbip_dbg_vhci_rh("rh_port_disconnect %d\n", rhport);
spin_lock_irqsave(&the_controller->lock, flags);
the_controller->port_status[rhport] &= ~USB_PORT_STAT_CONNECTION;
the_controller->port_status[rhport] |=
(1 << USB_PORT_FEAT_C_CONNECTION);
spin_unlock_irqrestore(&the_controller->lock, flags);
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;
unsigned long flags;
retval = DIV_ROUND_UP(VHCI_NPORTS + 1, 8);
memset(buf, 0, retval);
vhci = hcd_to_vhci(hcd);
spin_lock_irqsave(&vhci->lock, flags);
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_irqrestore(&vhci->lock, flags);
return changed ? retval : 0;
}
static inline void hub_descriptor(struct usb_hub_descriptor *desc)
{
memset(desc, 0, sizeof(*desc));
desc->bDescriptorType = USB_DT_HUB;
desc->bDescLength = 9;
desc->wHubCharacteristics = cpu_to_le16(
HUB_CHAR_INDV_PORT_LPSM | HUB_CHAR_COMMON_OCPM);
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;
unsigned long flags;
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_irqsave(&dum->lock, flags);
/* 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_irqrestore(&dum->lock, flags);
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;
unsigned long flags;
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_irqsave(&vdev->priv_lock, flags);
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_irqrestore(&vdev->priv_lock, flags);
}
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;
unsigned long flags;
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_irqsave(&the_controller->lock, flags);
if (urb->status != -EINPROGRESS) {
dev_err(dev, "URB already unlinked!, status %d\n", urb->status);
spin_unlock_irqrestore(&the_controller->lock, flags);
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_irqrestore(&the_controller->lock, flags);
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);
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");
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_irqrestore(&the_controller->lock, flags);
return 0;
no_need_xmit:
usb_hcd_unlink_urb_from_ep(hcd, urb);
no_need_unlink:
spin_unlock_irqrestore(&the_controller->lock, flags);
if (!ret)
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;
unsigned long flags;
pr_info("dequeue a urb %p\n", urb);
spin_lock_irqsave(&the_controller->lock, flags);
priv = urb->hcpriv;
if (!priv) {
/* URB was never linked! or will be soon given back by
* vhci_rx. */
spin_unlock_irqrestore(&the_controller->lock, flags);
return -EIDRM;
}
{
int ret = 0;
ret = usb_hcd_check_unlink_urb(hcd, urb, status);
if (ret) {
spin_unlock_irqrestore(&the_controller->lock, flags);
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_irqrestore(&the_controller->lock, flags);
usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb,
urb->status);
spin_lock_irqsave(&the_controller->lock, flags);
} 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_irqrestore(&the_controller->lock, flags);
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_irqrestore(&the_controller->lock, flags);
usbip_dbg_vhci_hc("leave\n");
return 0;
}
static void vhci_device_unlink_cleanup(struct vhci_device *vdev)
{
struct vhci_unlink *unlink, *tmp;
unsigned long flags;
spin_lock_irqsave(&the_controller->lock, flags);
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_irqrestore(&the_controller->lock, flags);
usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb,
urb->status);
spin_lock_irqsave(&the_controller->lock, flags);
spin_lock(&vdev->priv_lock);
kfree(unlink);
}
spin_unlock(&vdev->priv_lock);
spin_unlock_irqrestore(&the_controller->lock, flags);
}
/*
* 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);
unsigned long flags;
spin_lock_irqsave(&ud->lock, flags);
vdev->speed = 0;
vdev->devid = 0;
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_irqrestore(&ud->lock, flags);
}
static void vhci_device_unusable(struct usbip_device *ud)
{
unsigned long flags;
spin_lock_irqsave(&ud->lock, flags);
ud->status = VDEV_ST_ERROR;
spin_unlock_irqrestore(&ud->lock, flags);
}
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)
{
dev_err_ratelimited(&hcd->self.root_hub->dev, "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);
unsigned long flags;
dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
spin_lock_irqsave(&vhci->lock, flags);
hcd->state = HC_STATE_SUSPENDED;
spin_unlock_irqrestore(&vhci->lock, flags);
return 0;
}
static int vhci_bus_resume(struct usb_hcd *hcd)
{
struct vhci_hcd *vhci = hcd_to_vhci(hcd);
int rc = 0;
unsigned long flags;
dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
spin_lock_irqsave(&vhci->lock, flags);
if (!HCD_HW_ACCESSIBLE(hcd))
rc = -ESHUTDOWN;
else
hcd->state = HC_STATE_RUNNING;
spin_unlock_irqrestore(&vhci->lock, flags);
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;
unsigned long flags;
hcd = platform_get_drvdata(pdev);
spin_lock_irqsave(&the_controller->lock, flags);
for (rhport = 0; rhport < VHCI_NPORTS; rhport++)
if (the_controller->port_status[rhport] &
USB_PORT_STAT_CONNECTION)
connected += 1;
spin_unlock_irqrestore(&the_controller->lock, flags);
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,
},
};
/*
* 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);