linux-kernel - [PATCH v5 4/5] iommu/arm-smmu-v3: add support for non-strict mode

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Date:   Wed, 15 Aug 2018 09:28:29 +0800
From:   Zhen Lei <thunder.leizhen@...wei.com>
To:     Robin Murphy <robin.murphy@....com>,
        Will Deacon <will.deacon@....com>,
        Joerg Roedel <joro@...tes.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>,
        LinuxArm <linuxarm@...wei.com>,
        Hanjun Guo <guohanjun@...wei.com>,
        Libin <huawei.libin@...wei.com>,
        "John Garry" <john.garry@...wei.com>
Subject: [PATCH v5 4/5] iommu/arm-smmu-v3: add support for non-strict mode

Dynamically choose strict or non-strict mode for page table config based
on the iommu domain type.

Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
---
 drivers/iommu/arm-smmu-v3.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 4402187..61eb7ec 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -1622,6 +1622,11 @@ static int arm_smmu_domain_finalise(struct iommu_domain *domain)
 	if (smmu->features & ARM_SMMU_FEAT_COHERENCY)
 		pgtbl_cfg.quirks = IO_PGTABLE_QUIRK_NO_DMA;

+	if (domain->type == IOMMU_DOMAIN_DMA) {
+		domain->non_strict = true;
+		pgtbl_cfg.quirks |= IO_PGTABLE_QUIRK_NON_STRICT;
+	}
+
 	pgtbl_ops = alloc_io_pgtable_ops(fmt, &pgtbl_cfg, smmu_domain);
 	if (!pgtbl_ops)
 		return -ENOMEM;
--
1.8.3