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 ffad1ea..224c6dd 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -837,6 +837,11 @@
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 6894999..b944b2b 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -249,6 +249,7 @@
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);