linux-kernel - [PATCH 3/4] iommu/tegra-smmu: Fix iova->phys translation

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Message-Id: <20191220002914.19043-4-nicoleotsuka@gmail.com>
Date:   Thu, 19 Dec 2019 16:29:13 -0800
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     thierry.reding@...il.com, joro@...tes.org
Cc:     jonathanh@...dia.com, linux-tegra@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] iommu/tegra-smmu: Fix iova->phys translation

IOVA might not be always 4KB aligned. So tegra_smmu_iova_to_phys
function needs to add on the lower 12-bit offset from input iova.

Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>
---
 drivers/iommu/tegra-smmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 5594b47a88bf..3999ecb63cfa 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -721,7 +721,7 @@ static phys_addr_t tegra_smmu_iova_to_phys(struct iommu_domain *domain,
 
 	pfn = *pte & as->smmu->pfn_mask;
 
-	return SMMU_PFN_PHYS(pfn);
+	return SMMU_PFN_PHYS(pfn) + SMMU_OFFSET_IN_PAGE(iova);
 }
 
 static struct tegra_smmu *tegra_smmu_find(struct device_node *np)
-- 
2.17.1