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

Liu Yi L
2021-09-19T06:43:00Z

From: Lu Baolu <baolu.lu@linux.intel.com>

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

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
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