xen: add backend driver support
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>
diff --git a/drivers/xen/xenbus/xenbus_probe_frontend.c b/drivers/xen/xenbus/xenbus_probe_frontend.c
index 04c4f01..dd31d5a4 100644
--- a/drivers/xen/xenbus/xenbus_probe_frontend.c
+++ b/drivers/xen/xenbus/xenbus_probe_frontend.c
@@ -62,6 +62,17 @@
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 @@
.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 @@
}
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 @@
}
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;
}