mdev: Send uevents around parent device registration

This allows udev to trigger rules when a parent device is registered
or unregistered from mdev.

Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Kirti Wankhede <kwankhede@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index ed86087631344b2eb6d6ac2d55210cd8eb020fc6..b558d4cfd082ad44a6263b52faae9bdc4f84c774 100644 (file)
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -143,6 +143,8 @@ int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops)
 {
        int ret;
        struct mdev_parent *parent;
+       char *env_string = "MDEV_STATE=registered";
+       char *envp[] = { env_string, NULL };
 
        /* check for mandatory ops */
        if (!ops || !ops->create || !ops->remove || !ops->supported_type_groups)
@@ -194,6 +196,8 @@ int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops)
        mutex_unlock(&parent_list_lock);
 
        dev_info(dev, "MDEV: Registered\n");
+       kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
+
        return 0;
 
 add_dev_err:
@@ -217,6 +221,8 @@ EXPORT_SYMBOL(mdev_register_device);
 void mdev_unregister_device(struct device *dev)
 {
        struct mdev_parent *parent;
+       char *env_string = "MDEV_STATE=unregistered";
+       char *envp[] = { env_string, NULL };
 
        mutex_lock(&parent_list_lock);
        parent = __find_parent_device(dev);
@@ -240,6 +246,9 @@ void mdev_unregister_device(struct device *dev)
        up_write(&parent->unreg_sem);
 
        mdev_put_parent(parent);
+
+       /* We still have the caller's reference to use for the uevent */
+       kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
 }
 EXPORT_SYMBOL(mdev_unregister_device);