iommu: Implement DOMAIN_ATTR_PAGING attribute

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 <joro@8bytes.org>

iommu: Implement DOMAIN_ATTR_PAGING attribute
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 <joro@8bytes.org>
Joerg Roedel
1 parent 57886518a8
Showing 2 changed files with 6 additions and 0 deletions Side-by-side Diff
drivers/iommu/iommu.c
include/linux/iommu.h
@@ -869,6 +869,7 @@
 			  enum iommu_attr attr, void *data)
 {
 	struct iommu_domain_geometry *geometry;
+	bool *paging;
 	int ret = 0;
  
 	switch (attr) {
@@ -876,6 +877,10 @@
 		geometry  = data;
 		*geometry = domain->geometry;
  
+		break;
+	case DOMAIN_ATTR_PAGING:
+		paging  = data;
+		*paging = (domain->ops->pgsize_bitmap != 0UL);
 		break;
 	default:
 		if (!domain->ops->domain_get_attr)
@@ -59,6 +59,7 @@
  
 enum iommu_attr {
 	DOMAIN_ATTR_GEOMETRY,
+	DOMAIN_ATTR_PAGING,
 	DOMAIN_ATTR_MAX,
 };
...	...	@@ -869,6 +869,7 @@
869	869	enum iommu_attr attr, void *data)
870	870	{
871	871	struct iommu_domain_geometry *geometry;
	872	+ bool *paging;
872	873	int ret = 0;
873	874
874	875	switch (attr) {
...	...	@@ -876,6 +877,10 @@
876	877	geometry = data;
877	878	*geometry = domain->geometry;
878	879
	880	+ break;
	881	+ case DOMAIN_ATTR_PAGING:
	882	+ paging = data;
	883	+ *paging = (domain->ops->pgsize_bitmap != 0UL);
879	884	break;
880	885	default:
881	886	if (!domain->ops->domain_get_attr)
...	...	@@ -59,6 +59,7 @@
59	59
60	60	enum iommu_attr {
61	61	DOMAIN_ATTR_GEOMETRY,
	62	+ DOMAIN_ATTR_PAGING,
62	63	DOMAIN_ATTR_MAX,
63	64	};
64	65