[PATCH 12/22] iommu: Add function to query the default domain of a group

[Joerg Roedel]

From: Joerg Roedel <jroedel@xxxxxxx>

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

Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
---
 drivers/iommu/iommu.c | 5 +++++
 include/linux/iommu.h | 1 +
 2 files changed, 6 insertions(+)

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 @@ 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 6894999..b944b2b 100644
--- 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);
-- 
1.9.1

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