iommu/amd: Implement DOMAIN_ATTR_GEOMETRY attribute

Implement the attribute itself and add the code for the
AMD IOMMU driver.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

2 files changed, 20 insertions, 3 deletions

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index a2e418cba0ff..259a6beddece 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3069,6 +3069,10 @@ static int amd_iommu_domain_init(struct iommu_domain *dom)
 
         dom->priv = domain;
 
+        dom->geometry.aperture_start = 0;
+        dom->geometry.aperture_end   = ~0ULL;
+        dom->geometry.force_aperture = true;
+
         return 0;
 
 out_free:
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index c39972d8ded3..ed5e0a553ca7 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -348,10 +348,23 @@ EXPORT_SYMBOL_GPL(iommu_device_group);
 int iommu_domain_get_attr(struct iommu_domain *domain,
                           enum iommu_attr attr, void *data)
 {
-        if (!domain->ops->domain_get_attr)
-                return -EINVAL;
+        struct iommu_domain_geometry *geometry;
+        int ret = 0;
+
+        switch (attr) {
+        case DOMAIN_ATTR_GEOMETRY:
+                geometry  = data;
+                *geometry = domain->geometry;
+
+                break;
+        default:
+                if (!domain->ops->domain_get_attr)
+                        return -EINVAL;
 
-        return domain->ops->domain_get_attr(domain, attr, data);
+                ret = domain->ops->domain_get_attr(domain, attr, data);
+        }
+
+        return ret;
 }
 EXPORT_SYMBOL_GPL(iommu_domain_get_attr);