iommu: Add function to query the default domain of a group

This will be used to handle unity mappings in the iommu
drivers.

Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index ffad1eaf450dbf909749fe410f16feed8325b970..224c6dd2d2490d74140e7f905b9877822f7dbe49 100644 (file)
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -837,6 +837,11 @@ struct iommu_group *iommu_group_get_for_dev(struct device *dev)
        return group;
 }
 
+struct iommu_domain *iommu_group_default_domain(struct iommu_group *group)
+{
+       return group->default_domain;
+}
+
 static int add_iommu_group(struct device *dev, void *data)
 {
        struct iommu_callback_data *cb = data;

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 689499904166e6821b6ea0569f602d24696a7ae8..b944b2be4fa26ef663ec31291926ac38973ab318 100644 (file)
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -249,6 +249,7 @@ extern int iommu_group_unregister_notifier(struct iommu_group *group,
                                           struct notifier_block *nb);
 extern int iommu_group_id(struct iommu_group *group);
 extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
+extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
 
 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
                                 void *data);