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Message-ID: <1453872079-27140-7-git-send-email-anup.patel@broadcom.com>
Date: Wed, 27 Jan 2016 10:51:19 +0530
From: Anup Patel <anup.patel@...adcom.com>
To: Catalin Marinas <catalin.marinas@....com>,
Joerg Roedel <joro@...tes.org>,
Will Deacon <will.deacon@....com>,
Robin Murphy <Robin.Murphy@....com>,
Sricharan R <sricharan@...eaurora.org>,
Linux IOMMU <iommu@...ts.linux-foundation.org>,
Linux ARM Kernel <linux-arm-kernel@...ts.infradead.org>
CC: Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
"Mark Rutland" <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
"Device Tree" <devicetree@...r.kernel.org>,
Ray Jui <rjui@...adcom.com>,
Scott Branden <sbranden@...adcom.com>,
Vikram Prakash <vikramp@...adcom.com>,
"Linux Kernel" <linux-kernel@...r.kernel.org>,
BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
Anup Patel <anup.patel@...adcom.com>
Subject: [RFC PATCH 6/6] iommu/arm-smmu: Update bindings document for smmu-inst-as-data DT option
This patch adds info about 'smmu-inst-as-data' DT option in ARM
SMMUv1/SMMUv2 driver bindings document.
Signed-off-by: Anup Patel <anup.patel@...adcom.com>
Reviewed-by: Ray Jui <rjui@...adcom.com>
Reviewed-by: Vikram Prakash <vikramp@...adcom.com>
Reviewed-by: Scott Branden <sbranden@...adcom.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
--
1.9.1
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