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iommu: Implement DOMAIN_ATTR_PAGING attribute

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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>
This commit is contained in:
Joerg Roedel 2013-01-29 13:49:04 +01:00
parent 57886518a8
commit d2e1216016
2 changed files with 6 additions and 0 deletions
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5
drivers/iommu/iommu.c
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@ -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) {
@ -876,6 +877,10 @@ int iommu_domain_get_attr(struct iommu_domain *domain,
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)

1
include/linux/iommu.h
View File

@ -59,6 +59,7 @@ struct iommu_domain {
enum iommu_attr {
DOMAIN_ATTR_GEOMETRY,
DOMAIN_ATTR_PAGING,
DOMAIN_ATTR_MAX,
};