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

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Date:   Sun, 19 Sep 2021 14:38:37 +0800
From:   Liu Yi L <yi.l.liu@...el.com>
To:     alex.williamson@...hat.com, jgg@...dia.com, hch@....de,
        jasowang@...hat.com, joro@...tes.org
Cc:     jean-philippe@...aro.org, kevin.tian@...el.com, parav@...lanox.com,
        lkml@...ux.net, pbonzini@...hat.com, lushenming@...wei.com,
        eric.auger@...hat.com, corbet@....net, ashok.raj@...el.com,
        yi.l.liu@...el.com, yi.l.liu@...ux.intel.com, jun.j.tian@...el.com,
        hao.wu@...el.com, dave.jiang@...el.com,
        jacob.jun.pan@...ux.intel.com, kwankhede@...dia.com,
        robin.murphy@....com, kvm@...r.kernel.org,
        iommu@...ts.linux-foundation.org, dwmw2@...radead.org,
        linux-kernel@...r.kernel.org, baolu.lu@...ux.intel.com,
        david@...son.dropbear.id.au, nicolinc@...dia.com
Subject: [RFC 09/20] iommu: Add page size and address width attributes

From: Lu Baolu <baolu.lu@...ux.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@...ux.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