This attribute of a domain can be queried to find out if the
domain supports setting up page-tables using the iommu_map()
and iommu_unmap() functions.
Signed-off-by: Joerg Roedel <j...@8bytes.org>
---
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 622360f..ab9dafd 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -869,6 +869,7 @@ int iommu_domain_get_attr(struct iommu_domain *domain,
enum iommu_attr attr, void *data)
{
struct iommu_domain_geometry *geometry;
+ bool *paging;
int ret = 0;
switch (attr) {
@@ -877,6 +878,10 @@ int iommu_domain_get_attr(struct iommu_domain *domain,
*geometry = domain->geometry;
break;
+ case DOMAIN_ATTR_PAGING:
+ paging = data;
+ *paging = (domain->ops->pgsize_bitmap != 0UL);
+ break;
default:
if (!domain->ops->domain_get_attr)
return -EINVAL;
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 7e6ce72..26066f5 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -59,6 +59,7 @@ struct iommu_domain {
enum iommu_attr {
DOMAIN_ATTR_GEOMETRY,
+ DOMAIN_ATTR_PAGING,
DOMAIN_ATTR_MAX,
};
--
1.7.9.5
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