linux-kernel - [PATCH v6 1/5] iommu: Add DOMAIN_ATTR_SPLIT

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Message-Id: <20200409233350.6343-2-jcrouse@codeaurora.org>
Date:   Thu,  9 Apr 2020 17:33:46 -0600
From:   Jordan Crouse <jcrouse@...eaurora.org>
To:     iommu@...ts.linux-foundation.org
Cc:     linux-arm-msm@...r.kernel.org, robin.murphy@....com,
        will@...nel.org, linux-arm-kernel@...ts.infradead.org,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org
Subject: [PATCH v6 1/5] iommu: Add DOMAIN_ATTR_SPLIT_TABLES

Add a new attribute to enable and query the state of split pagetables
for the domain.

Acked-by: Will Deacon <will@...nel.org>
Signed-off-by: Jordan Crouse <jcrouse@...eaurora.org>
---

 include/linux/iommu.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 7ef8b0bda695..d0f96f748a00 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -126,6 +126,8 @@ enum iommu_attr {
 	DOMAIN_ATTR_FSL_PAMUV1,
 	DOMAIN_ATTR_NESTING,	/* two stages of translation */
 	DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE,
+	/* Enable split pagetables (for example, TTBR1 on arm-smmu) */
+	DOMAIN_ATTR_SPLIT_TABLES,
 	DOMAIN_ATTR_MAX,
 };
 
-- 
2.17.1