iommu/amd: Add function to get IOMMUv2 domain for pdev
The AMD IOMMUv2 driver needs to get the IOMMUv2 domain
associated with a particular device. This patch adds a
function to get this information.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 9a7e64b..71773d0 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2958,6 +2958,8 @@
if (!domain->pt_root)
goto out_free;
+ domain->iommu_domain = dom;
+
dom->priv = domain;
return 0;
@@ -3463,3 +3465,19 @@
return iommu_queue_command(iommu, &cmd);
}
EXPORT_SYMBOL(amd_iommu_complete_ppr);
+
+struct iommu_domain *amd_iommu_get_v2_domain(struct pci_dev *pdev)
+{
+ struct protection_domain *domain;
+
+ domain = get_domain(&pdev->dev);
+ if (IS_ERR(domain))
+ return NULL;
+
+ /* Only return IOMMUv2 domains */
+ if (!(domain->flags & PD_IOMMUV2_MASK))
+ return NULL;
+
+ return domain->iommu_domain;
+}
+EXPORT_SYMBOL(amd_iommu_get_v2_domain);
