[RFC 09/20] iommu: Add page size and address width attributes

[Liu Yi L]

From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>

This exposes PAGE_SIZE and ADDR_WIDTH attributes. The iommufd could use
them to define the IOAS.

Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
---
 include/linux/iommu.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 943de6897f56..86d34e4ce05e 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -153,9 +153,13 @@ enum iommu_dev_features {
 /**
  * enum iommu_devattr - Per device IOMMU attributes
  * @IOMMU_DEV_INFO_FORCE_SNOOP [bool]: IOMMU can force DMA to be snooped.
+ * @IOMMU_DEV_INFO_PAGE_SIZE [u64]: Page sizes that iommu supports.
+ * @IOMMU_DEV_INFO_ADDR_WIDTH [u32]: Address width supported.
  */
 enum iommu_devattr {
 	IOMMU_DEV_INFO_FORCE_SNOOP,
+	IOMMU_DEV_INFO_PAGE_SIZE,
+	IOMMU_DEV_INFO_ADDR_WIDTH,
 };
 
 #define IOMMU_PASID_INVALID	(-1U)
-- 
2.25.1