/*
* release_device() must stop using any attached domain on the device.
- * If there are still other devices in the group they are not effected
+ * If there are still other devices in the group, they are not affected
* by this callback.
*
- * The IOMMU driver must set the device to either an identity or
- * blocking translation and stop using any domain pointer, as it is
- * going to be freed.
+ * If the iommu driver provides release_domain, the core code ensures
+ * that domain is attached prior to calling release_device. Drivers can
+ * use this to enforce a translation on the idle iommu. Typically, the
+ * global static blocked_domain is a good choice.
+ *
+ * Otherwise, the iommu driver must set the device to either an identity
+ * or a blocking translation in release_device() and stop using any
+ * domain pointer, as it is going to be freed.
+ *
+ * Regardless, if a delayed attach never occurred, then the release
+ * should still avoid touching any hardware configuration either.
*/
+ if (!dev->iommu->attach_deferred && ops->release_domain)
+ ops->release_domain->ops->attach_dev(ops->release_domain, dev);
+
if (ops->release_device)
ops->release_device(dev);
struct module *owner;
struct iommu_domain *identity_domain;
struct iommu_domain *blocked_domain;
+ struct iommu_domain *release_domain;
struct iommu_domain *default_domain;
};