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xen: add backend driver support

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Impact: backend device support

Add the basic machinery to support backend drivers.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
[corresponds to 79727b851bac in git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Ian Campbell
2009-02-09 12:05:51 -08:00
committed by Konrad Rzeszutek Wilk
parent 2de06cc1f1
commit df660251eb
8 changed files with 345 additions and 22 deletions
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39
drivers/xen/xenbus/xenbus_probe_frontend.c
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@@ -62,6 +62,17 @@ static int xenbus_probe_frontend(struct xen_bus_type *bus, const char *type, con
return err;
}
static int xenbus_uevent_frontend(struct device *_dev, struct kobj_uevent_env *env)
{
struct xenbus_device *dev = to_xenbus_device(_dev);
if (add_uevent_var(env, "MODALIAS=xen:%s", dev->devicetype))
return -ENOMEM;
return 0;
}
static void backend_changed(struct xenbus_watch *watch,
const char **vec, unsigned int len)
{
@@ -81,7 +92,7 @@ static struct xen_bus_type xenbus_frontend = {
.bus = {
.name = "xen",
.match = xenbus_match,
.uevent = xenbus_uevent,
.uevent = xenbus_uevent_frontend,
.probe = xenbus_dev_probe,
.remove = xenbus_dev_remove,
.shutdown = xenbus_dev_shutdown,
@@ -232,8 +243,25 @@ int __xenbus_register_frontend(struct xenbus_driver *drv,
}
EXPORT_SYMBOL_GPL(__xenbus_register_frontend);
static int frontend_probe_and_watch(struct notifier_block *notifier,
unsigned long event,
void *data)
{
/* Enumerate devices in xenstore and watch for changes. */
xenbus_probe_devices(&xenbus_frontend);
printk(KERN_CRIT "%s devices probed ok\n", __func__);
register_xenbus_watch(&fe_watch);
printk(KERN_CRIT "%s watch add ok ok\n", __func__);
printk(KERN_CRIT "%s all done\n", __func__);
return NOTIFY_DONE;
}
static int __init xenbus_probe_frontend_init(void)
{
static struct notifier_block xenstore_notifier = {
.notifier_call = frontend_probe_and_watch
};
int err;
DPRINTK("");
@@ -246,14 +274,7 @@ static int __init xenbus_probe_frontend_init(void)
}
printk(KERN_CRIT "%s bus registered ok\n", __func__);
if (!xen_initial_domain()) {
/* Enumerate devices in xenstore and watch for changes. */
xenbus_probe_devices(&xenbus_frontend);
printk(KERN_CRIT "%s devices probed ok\n", __func__);
register_xenbus_watch(&fe_watch);
printk(KERN_CRIT "%s watch add ok ok\n", __func__);
printk(KERN_CRIT "%s all done\n", __func__);
}
register_xenstore_notifier(&xenstore_notifier);
return 0;
}