diff options
Diffstat (limited to 'drivers/vfio/vfio.c')
| -rw-r--r-- | drivers/vfio/vfio.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index bd36c16b0ef2..301eed07a0ab 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -1901,6 +1901,79 @@ err_unpin_pages: } EXPORT_SYMBOL(vfio_unpin_pages); +int vfio_register_notifier(struct device *dev, struct notifier_block *nb) +{ + struct vfio_container *container; + struct vfio_group *group; + struct vfio_iommu_driver *driver; + int ret; + + if (!dev || !nb) + return -EINVAL; + + group = vfio_group_get_from_dev(dev); + if (IS_ERR(group)) + return PTR_ERR(group); + + ret = vfio_group_add_container_user(group); + if (ret) + goto err_register_nb; + + container = group->container; + down_read(&container->group_lock); + + driver = container->iommu_driver; + if (likely(driver && driver->ops->register_notifier)) + ret = driver->ops->register_notifier(container->iommu_data, nb); + else + ret = -ENOTTY; + + up_read(&container->group_lock); + vfio_group_try_dissolve_container(group); + +err_register_nb: + vfio_group_put(group); + return ret; +} +EXPORT_SYMBOL(vfio_register_notifier); + +int vfio_unregister_notifier(struct device *dev, struct notifier_block *nb) +{ + struct vfio_container *container; + struct vfio_group *group; + struct vfio_iommu_driver *driver; + int ret; + + if (!dev || !nb) + return -EINVAL; + + group = vfio_group_get_from_dev(dev); + if (IS_ERR(group)) + return PTR_ERR(group); + + ret = vfio_group_add_container_user(group); + if (ret) + goto err_unregister_nb; + + container = group->container; + down_read(&container->group_lock); + + driver = container->iommu_driver; + if (likely(driver && driver->ops->unregister_notifier)) + ret = driver->ops->unregister_notifier(container->iommu_data, + nb); + else + ret = -ENOTTY; + + up_read(&container->group_lock); + vfio_group_try_dissolve_container(group); + +err_unregister_nb: + vfio_group_put(group); + return ret; +} +EXPORT_SYMBOL(vfio_unregister_notifier); + /** * Module/class support */ |