static int xenbus_uevent_backend(struct device *dev, struct kobj_uevent_env *env)
{
struct xenbus_device *xdev;
struct xenbus_driver *drv;
DPRINTK("");
if (dev == NULL)
return -ENODEV;
xdev = to_xenbus_device(dev);
if (xdev == NULL)
return -ENODEV;
/* stuff we want to pass to /sbin/hotplug */
add_uevent_var(env, "XENBUS_TYPE=%s", xdev->devicetype);
add_uevent_var(env, "XENBUS_PATH=%s", xdev->nodename);
add_uevent_var(env, "XENBUS_BASE_PATH=%s", xenbus_backend.root);
if (dev->driver) {
drv = to_xenbus_driver(dev->driver);
if (drv && drv->uevent)
return drv->uevent(xdev, env);
}
return 0;
}
static int is_device_connecting(struct device *dev, void *data, bool ignore_nonessential)
{
struct xenbus_device *xendev = to_xenbus_device(dev);
struct device_driver *drv = data;
struct xenbus_driver *xendrv;
/*
*/
if (!dev->driver)
return 0;
/* */
if (drv && (dev->driver != drv))
return 0;
if (ignore_nonessential) {
/*
*/
if ((strncmp(xendev->nodename, "device/vkbd", 11) == 0))
return 0;
if ((strncmp(xendev->nodename, "device/vfb", 10) == 0))
return 0;
}
xendrv = to_xenbus_driver(dev->driver);
return (xendev->state < XenbusStateConnected ||
(xendev->state == XenbusStateConnected &&
xendrv->is_ready && !xendrv->is_ready(xendev)));
}
static int is_device_connecting(struct device *dev, void *data, bool ignore_nonessential)
{
struct xenbus_device *xendev = to_xenbus_device(dev);
struct device_driver *drv = data;
struct xenbus_driver *xendrv;
/*
* A device with no driver will never connect. We care only about
* devices which should currently be in the process of connecting.
*/
if (!dev->driver)
return 0;
/* Is this search limited to a particular driver? */
if (drv && (dev->driver != drv))
return 0;
if (ignore_nonessential) {
/* With older QEMU, for PVonHVM guests the guest config files
* could contain: vfb = [ 'vnc=1, vnclisten=0.0.0.0']
* which is nonsensical as there is no PV FB (there can be
* a PVKB) running as HVM guest. */
if ((strncmp(xendev->nodename, "device/vkbd", 11) == 0))
return 0;
if ((strncmp(xendev->nodename, "device/vfb", 10) == 0))
return 0;
}
xendrv = to_xenbus_driver(dev->driver);
return (xendev->state < XenbusStateConnected ||
(xendev->state == XenbusStateConnected &&
xendrv->is_ready && !xendrv->is_ready(xendev)));
}
static int talk_to_otherend(struct xenbus_device *dev)
{
struct xenbus_driver *drv = to_xenbus_driver(dev->dev.driver);
free_otherend_watch(dev);
free_otherend_details(dev);
return drv->read_otherend_details(dev);
}
int xenbus_match(struct device *_dev, struct device_driver *_drv)
{
struct xenbus_driver *drv = to_xenbus_driver(_drv);
if (!drv->ids)
return 0;
return match_device(drv->ids, to_xenbus_device(_dev)) != NULL;
}
int xenbus_dev_probe(struct device *_dev)
{
struct xenbus_device *dev = to_xenbus_device(_dev);
struct xenbus_driver *drv = to_xenbus_driver(_dev->driver);
const struct xenbus_device_id *id;
int err;
DPRINTK("%s", dev->nodename);
if (!drv->probe) {
err = -ENODEV;
goto fail;
}
id = match_device(drv->ids, dev);
if (!id) {
err = -ENODEV;
goto fail;
}
err = talk_to_otherend(dev);
if (err) {
dev_warn(&dev->dev,
"xenbus_probe: talk_to_otherend on %s failed.\n",
dev->nodename);
return err;
}
err = drv->probe(dev, id);
if (err)
goto fail;
err = watch_otherend(dev);
if (err) {
dev_warn(&dev->dev,
"xenbus_probe: watch_otherend on %s failed.\n",
dev->nodename);
return err;
}
return 0;
fail:
xenbus_dev_error(dev, err, "xenbus_dev_probe on %s", dev->nodename);
xenbus_switch_state(dev, XenbusStateClosed);
#if defined(CONFIG_XEN) || defined(MODULE)
return -ENODEV;
#else
return err;
#endif
}
/* add for vmdq migrate.When the device is vmdq_vnic ,return */
if(0 == strcmp(xendev->devicetype, VMDQ_VNIC)){
return 0;
}
int err = xenbus_gather(XBT_NIL, xendev->nodename,
id_node, "%i", &xendev->otherend_id,
path_node, NULL, &xendev->otherend,
NULL);
if (err) {
xenbus_dev_fatal(xendev, err,
"reading other end details from %s",
xendev->nodename);
return err;
}
if (strlen(xendev->otherend) == 0 ||
!xenbus_exists(XBT_NIL, xendev->otherend, "")) {
xenbus_dev_fatal(xendev, -ENOENT,
"unable to read other end from %s. "
"missing or inaccessible.",
xendev->nodename);
free_otherend_details(xendev);
return -ENOENT;
}
return 0;
}
PARAVIRT_EXPORT_SYMBOL(xenbus_read_otherend_details);
#if defined(CONFIG_XEN) || defined(MODULE)
static int read_backend_details(struct xenbus_device *xendev)
{
return xenbus_read_otherend_details(xendev, "backend-id", "backend");
}
static void otherend_changed(struct xenbus_watch *watch,
const char **vec, unsigned int len)
#else /* !CONFIG_XEN && !MODULE */
void xenbus_otherend_changed(struct xenbus_watch *watch,
const char **vec, unsigned int len,
int ignore_on_shutdown)
#endif /* CONFIG_XEN || MODULE */
{
struct xenbus_device *dev =
container_of(watch, struct xenbus_device, otherend_watch);
struct xenbus_driver *drv = to_xenbus_driver(dev->dev.driver);
enum xenbus_state state;
/* Protect us against watches firing on old details when the otherend
details change, say immediately after a resume. */
if (!dev->otherend ||
strncmp(dev->otherend, vec[XS_WATCH_PATH],
strlen(dev->otherend))) {
dev_dbg(&dev->dev, "Ignoring watch at %s", vec[XS_WATCH_PATH]);
return;
}
state = xenbus_read_driver_state(dev->otherend);
dev_dbg(&dev->dev, "state is %d (%s), %s, %s",
state, xenbus_strstate(state), dev->otherend_watch.node,
vec[XS_WATCH_PATH]);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
/*
* Ignore xenbus transitions during shutdown. This prevents us doing
* work that can fail e.g., when the rootfs is gone.
*/
if (system_state > SYSTEM_RUNNING) {
/* If we're frontend, drive the state machine to Closed. */
/* This should cause the backend to release our resources. */
# if defined(CONFIG_XEN) || defined(MODULE)
const struct xen_bus_type *bus =
container_of(dev->dev.bus, struct xen_bus_type, bus);
int ignore_on_shutdown = (bus->levels == 2);
# endif
if (ignore_on_shutdown && (state == XenbusStateClosing))
xenbus_frontend_closed(dev);
return;
}
#endif
if (drv->otherend_changed)
drv->otherend_changed(dev, state);
}
int xenbus_dev_remove(struct device *_dev)
{
struct xenbus_device *dev = to_xenbus_device(_dev);
struct xenbus_driver *drv = to_xenbus_driver(_dev->driver);
DPRINTK("%s", dev->nodename);
free_otherend_watch(dev);
free_otherend_details(dev);
if (drv->remove)
drv->remove(dev);
xenbus_switch_state(dev, XenbusStateClosed);
return 0;
}
static int xenbus_dev_probe(struct device *_dev)
{
struct xenbus_device *dev = to_xenbus_device(_dev);
struct xenbus_driver *drv = to_xenbus_driver(_dev->driver);
const struct xenbus_device_id *id;
int err;
DPRINTK("%s", dev->nodename);
if (!drv->probe) {
err = -ENODEV;
goto fail;
}
id = match_device(drv->ids, dev);
if (!id) {
err = -ENODEV;
goto fail;
}
err = talk_to_otherend(dev);
if (err) {
printk(KERN_WARNING
"xenbus_probe: talk_to_otherend on %s failed.\n",
dev->nodename);
return err;
}
err = drv->probe(dev, id);
if (err)
goto fail;
err = watch_otherend(dev);
if (err) {
printk(KERN_WARNING
"xenbus_probe: watch_otherend on %s failed.\n",
dev->nodename);
return err;
}
return 0;
fail:
xenbus_dev_error(dev, err, "xenbus_dev_probe on %s", dev->nodename);
xenbus_switch_state(dev, XenbusStateClosed);
return -ENODEV;
}
static int xenbus_hotplug_backend(struct device *dev, char **envp,
int num_envp, char *buffer, int buffer_size)
{
struct xenbus_device *xdev;
struct xenbus_driver *drv;
int i = 0;
int length = 0;
DPRINTK("");
if (dev == NULL)
return -ENODEV;
xdev = to_xenbus_device(dev);
if (xdev == NULL)
return -ENODEV;
/* stuff we want to pass to /sbin/hotplug */
add_hotplug_env_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"XENBUS_TYPE=%s", xdev->devicetype);
add_hotplug_env_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"XENBUS_PATH=%s", xdev->nodename);
add_hotplug_env_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"XENBUS_BASE_PATH=%s", xenbus_backend.root);
/* terminate, set to next free slot, shrink available space */
envp[i] = NULL;
envp = &envp[i];
num_envp -= i;
buffer = &buffer[length];
buffer_size -= length;
if (dev->driver) {
drv = to_xenbus_driver(dev->driver);
if (drv && drv->uevent)
return drv->uevent(xdev, envp, num_envp, buffer,
buffer_size);
}
return 0;
}
int xenbus_dev_suspend(struct device *dev)
{
int err = 0;
struct xenbus_driver *drv;
struct xenbus_device *xdev
= container_of(dev, struct xenbus_device, dev);
DPRINTK("%s", xdev->nodename);
if (dev->driver == NULL)
return 0;
drv = to_xenbus_driver(dev->driver);
if (drv->suspend)
err = drv->suspend(xdev);
if (err)
pr_warn("suspend %s failed: %i\n", dev_name(dev), err);
return 0;
}
static int resume_dev(struct device *dev, void *data)
{
int err;
struct xenbus_driver *drv;
struct xenbus_device *xdev;
DPRINTK("");
if (dev->driver == NULL)
return 0;
drv = to_xenbus_driver(dev->driver);
xdev = container_of(dev, struct xenbus_device, dev);
err = talk_to_otherend(xdev);
if (err) {
printk(KERN_WARNING
"xenbus: resume (talk_to_otherend) %s failed: %i\n",
dev_name(dev), err);
return err;
}
xdev->state = XenbusStateInitialising;
if (drv->resume) {
err = drv->resume(xdev);
if (err) {
printk(KERN_WARNING
"xenbus: resume %s failed: %i\n",
dev_name(dev), err);
return err;
}
}
err = watch_otherend(xdev);
if (err) {
printk(KERN_WARNING
"xenbus_probe: resume (watch_otherend) %s failed: "
"%d.\n", dev_name(dev), err);
return err;
}
return 0;
}
static int suspend_dev(struct device *dev, void *data)
{
int err = 0;
struct xenbus_driver *drv;
struct xenbus_device *xdev;
DPRINTK("");
if (dev->driver == NULL)
return 0;
drv = to_xenbus_driver(dev->driver);
xdev = container_of(dev, struct xenbus_device, dev);
if (drv->suspend)
err = drv->suspend(xdev);
if (err)
printk(KERN_WARNING
"xenbus: suspend %s failed: %i\n", dev_name(dev), err);
return 0;
}
static int suspend_cancel_dev(struct device *dev, void *data)
{
int err = 0;
struct xenbus_driver *drv;
struct xenbus_device *xdev;
DPRINTK("");
if (dev->driver == NULL)
return 0;
drv = to_xenbus_driver(dev->driver);
xdev = container_of(dev, struct xenbus_device, dev);
if (drv->suspend_cancel)
err = drv->suspend_cancel(xdev);
if (err)
pr_warning("xenbus: suspend_cancel %s failed: %i\n",
dev_name(dev), err);
return 0;
}
int xenbus_dev_suspend(struct device *dev, pm_message_t state)
{
int err = 0;
struct xenbus_driver *drv;
struct xenbus_device *xdev
= container_of(dev, struct xenbus_device, dev);
DPRINTK("%s", xdev->nodename);
if (dev->driver == NULL)
return 0;
drv = to_xenbus_driver(dev->driver);
if (drv->suspend)
err = drv->suspend(xdev, state);
if (err)
printk(KERN_WARNING
"xenbus: suspend %s failed: %i\n", dev_name(dev), err);
return 0;
}
static void otherend_changed(struct xenbus_watch *watch,
const char **vec, unsigned int len)
{
struct xenbus_device *dev =
container_of(watch, struct xenbus_device, otherend_watch);
struct xenbus_driver *drv = to_xenbus_driver(dev->dev.driver);
enum xenbus_state state;
/* Protect us against watches firing on old details when the otherend
details change, say immediately after a resume. */
if (!dev->otherend ||
strncmp(dev->otherend, vec[XS_WATCH_PATH],
strlen(dev->otherend))) {
dev_dbg(&dev->dev, "Ignoring watch at %s\n",
vec[XS_WATCH_PATH]);
return;
}
state = xenbus_read_driver_state(dev->otherend);
dev_dbg(&dev->dev, "state is %d, (%s), %s, %s\n",
state, xenbus_strstate(state), dev->otherend_watch.node,
vec[XS_WATCH_PATH]);
/*
* Ignore xenbus transitions during shutdown. This prevents us doing
* work that can fail e.g., when the rootfs is gone.
*/
if (system_state > SYSTEM_RUNNING) {
struct xen_bus_type *bus = bus;
bus = container_of(dev->dev.bus, struct xen_bus_type, bus);
/* If we're frontend, drive the state machine to Closed. */
/* This should cause the backend to release our resources. */
if ((bus == &xenbus_frontend) && (state == XenbusStateClosing))
xenbus_frontend_closed(dev);
return;
}
if (drv->otherend_changed)
drv->otherend_changed(dev, state);
}
static int is_disconnected_device(struct device *dev, void *data)
{
struct xenbus_device *xendev = to_xenbus_device(dev);
struct device_driver *drv = data;
struct xenbus_driver *xendrv;
/*
* A device with no driver will never connect. We care only about
* devices which should currently be in the process of connecting.
*/
if (!dev->driver)
return 0;
/* Is this search limited to a particular driver? */
if (drv && (dev->driver != drv))
return 0;
xendrv = to_xenbus_driver(dev->driver);
return (xendev->state != XenbusStateConnected ||
(xendrv->is_ready && !xendrv->is_ready(xendev)));
}
int xenbus_dev_resume(struct device *dev)
#endif
{
int err;
struct xenbus_driver *drv;
struct xenbus_device *xdev
= container_of(dev, struct xenbus_device, dev);
DPRINTK("%s", xdev->nodename);
if (dev->driver == NULL)
return 0;
drv = to_xenbus_driver(dev->driver);
err = talk_to_otherend(xdev);
if (err) {
pr_warning("xenbus: resume (talk_to_otherend) %s failed: %i\n",
dev_name(dev), err);
return err;
}
xdev->state = XenbusStateInitialising;
if (drv->resume) {
err = drv->resume(xdev);
if (err) {
pr_warning("xenbus: resume %s failed: %i\n",
dev_name(dev), err);
return err;
}
}
err = watch_otherend(xdev);
if (err) {
pr_warning("xenbus_probe: resume (watch_otherend) %s failed:"
" %d\n", dev_name(dev), err);
return err;
}
return 0;
}
void xenbus_otherend_changed(struct xenbus_watch *watch,
const char **vec, unsigned int len,
int ignore_on_shutdown)
{
struct xenbus_device *dev =
container_of(watch, struct xenbus_device, otherend_watch);
struct xenbus_driver *drv = to_xenbus_driver(dev->dev.driver);
enum xenbus_state state;
/* Protect us against watches firing on old details when the otherend
details change, say immediately after a resume. */
if (!dev->otherend ||
strncmp(dev->otherend, vec[XS_WATCH_PATH],
strlen(dev->otherend))) {
dev_dbg(&dev->dev, "Ignoring watch at %s\n",
vec[XS_WATCH_PATH]);
return;
}
state = xenbus_read_driver_state(dev->otherend);
dev_dbg(&dev->dev, "state is %d, (%s), %s, %s\n",
state, xenbus_strstate(state), dev->otherend_watch.node,
vec[XS_WATCH_PATH]);
/*
* Ignore xenbus transitions during shutdown. This prevents us doing
* work that can fail e.g., when the rootfs is gone.
*/
if (system_state > SYSTEM_RUNNING) {
if (ignore_on_shutdown && (state == XenbusStateClosing))
xenbus_frontend_closed(dev);
return;
}
if (drv->otherend_changed)
drv->otherend_changed(dev, state);
}
static int xenbus_uevent_backend(struct device *dev,
struct kobj_uevent_env *env)
{
struct xenbus_device *xdev;
struct xenbus_driver *drv;
struct xen_bus_type *bus;
DPRINTK("");
if (dev == NULL)
return -ENODEV;
xdev = to_xenbus_device(dev);
bus = container_of(xdev->dev.bus, struct xen_bus_type, bus);
if (add_uevent_var(env, "MODALIAS=xen-backend:%s", xdev->devicetype))
return -ENOMEM;
/* stuff we want to pass to /sbin/hotplug */
if (add_uevent_var(env, "XENBUS_TYPE=%s", xdev->devicetype))
return -ENOMEM;
if (add_uevent_var(env, "XENBUS_PATH=%s", xdev->nodename))
return -ENOMEM;
if (add_uevent_var(env, "XENBUS_BASE_PATH=%s", bus->root))
return -ENOMEM;
if (dev->driver) {
drv = to_xenbus_driver(dev->driver);
if (drv && drv->uevent)
return drv->uevent(xdev, env);
}
return 0;
}