[RFC PATCH 6/6] iommu/arm-smmu: Update bindings document for smmu-inst-as-data DT option
From: Anup Patel <hidden>
Date: 2016-01-27 05:22:17
Also in:
linux-devicetree, linux-iommu, lkml
Subsystem:
arm smmu drivers, iommu subsystem, open firmware and flattened device tree bindings, the rest · Maintainers:
Will Deacon, Joerg Roedel, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
This patch adds info about 'smmu-inst-as-data' DT option in ARM SMMUv1/SMMUv2 driver bindings document. Signed-off-by: Anup Patel <redacted> Reviewed-by: Ray Jui <rjui@broadcom.com> Reviewed-by: Vikram Prakash <redacted> Reviewed-by: Scott Branden <sbranden@broadcom.com> --- Documentation/devicetree/bindings/iommu/arm,smmu.txt | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.txt b/Documentation/devicetree/bindings/iommu/arm,smmu.txt
index 7180745..4c4d03e 100644
--- a/Documentation/devicetree/bindings/iommu/arm,smmu.txt
+++ b/Documentation/devicetree/bindings/iommu/arm,smmu.txt@@ -49,6 +49,14 @@ conditions. NOTE: this only applies to the SMMU itself, not masters connected upstream of the SMMU. +- smmu-inst-as-data : Treat privilege/unprivilege instruction fetch as + data read for SMMUv2. The SMMU driver by default provides + unprivilege read-write permission in page table entries. + For SMMUv2, privilege instruction fetch from MMU masters + will cause a context fault for unprivilege read-write + pages. To allow both privilege and unprivilege instruction + fetch, we have to forcefully treat it as data read. + - calxeda,smmu-secure-config-access : Enable proper handling of buggy implementations that always use secure access to SMMU configuration registers. In this case non-secure
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1.9.1