linux-kernel - [PATCH 7/7] iommu/arm-smmu-v3: add support for non-strict mode

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Message-ID: <1527752569-18020-8-git-send-email-thunder.leizhen@huawei.com>
Date:   Thu, 31 May 2018 15:42:49 +0800
From:   Zhen Lei <thunder.leizhen@...wei.com>
To:     Robin Murphy <robin.murphy@....com>,
        Will Deacon <will.deacon@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Clark <robdclark@...il.com>,
        Joerg Roedel <joro@...tes.org>,
        linux-mediatek <linux-mediatek@...ts.infradead.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        iommu <iommu@...ts.linux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
CC:     Zhen Lei <thunder.leizhen@...wei.com>,
        Hanjun Guo <guohanjun@...wei.com>,
        Libin <huawei.libin@...wei.com>,
        Guozhu Li <liguozhu@...ilicon.com>,
        "Xinwei Hu" <huxinwei@...wei.com>
Subject: [PATCH 7/7] iommu/arm-smmu-v3: add support for non-strict mode

1. Add IOMMU_CAP_NON_STRICT capability.
2. Dynamic choose strict or non-strict mode base on the iommu domain type.

Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
---
 drivers/iommu/arm-smmu-v3.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 59b3387..25bccbd 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -1440,6 +1440,8 @@ static bool arm_smmu_capable(enum iommu_cap cap)
 		return true;
 	case IOMMU_CAP_NOEXEC:
 		return true;
+	case IOMMU_CAP_NON_STRICT:
+		return true;
 	default:
 		return false;
 	}
@@ -1767,7 +1769,7 @@ static int arm_smmu_map(struct iommu_domain *domain, unsigned long iova,
 	if (!ops)
 		return 0;
 
-	return ops->unmap(ops, iova, size, IOMMU_STRICT);
+	return ops->unmap(ops, iova, size, IOMMU_DOMAIN_IS_STRICT(domain));
 }
 
 static void arm_smmu_flush_iotlb_all(struct iommu_domain *domain)
@@ -1782,7 +1784,7 @@ static void arm_smmu_iotlb_sync(struct iommu_domain *domain)
 {
 	struct arm_smmu_device *smmu = to_smmu_domain(domain)->smmu;
 
-	if (smmu)
+	if (smmu && IOMMU_DOMAIN_IS_STRICT(domain))
 		__arm_smmu_tlb_sync(smmu);
 }
 
-- 
1.8.3