linux-kernel - [RESEND][PATCH 1/2] iommu/tegra-smmu: Fix tlb

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Message-Id: <20200917113155.13438-2-nicoleotsuka@gmail.com>
Date:   Thu, 17 Sep 2020 04:31:54 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     krzk@...nel.org, joro@...tes.org
Cc:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-tegra@...r.kernel.org, jonathanh@...dia.com,
        vdumpa@...dia.com, thierry.reding@...il.com
Subject: [RESEND][PATCH 1/2] iommu/tegra-smmu: Fix tlb_mask

The "num_tlb_lines" might not be a power-of-2 value, being 48 on
Tegra210 for example. So the current way of calculating tlb_mask
using the num_tlb_lines is not correct: tlb_mask=0x5f in case of
num_tlb_lines=48, which will trim a setting of 0x30 (48) to 0x10.

Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>
Acked-by: Thierry Reding <treding@...dia.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 84fdee473873..0becdbfea306 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -1120,7 +1120,7 @@ struct tegra_smmu *tegra_smmu_probe(struct device *dev,
 		BIT_MASK(mc->soc->num_address_bits - SMMU_PTE_SHIFT) - 1;
 	dev_dbg(dev, "address bits: %u, PFN mask: %#lx\n",
 		mc->soc->num_address_bits, smmu->pfn_mask);
-	smmu->tlb_mask = (smmu->soc->num_tlb_lines << 1) - 1;
+	smmu->tlb_mask = (1 << fls(smmu->soc->num_tlb_lines)) - 1;
 	dev_dbg(dev, "TLB lines: %u, mask: %#lx\n", smmu->soc->num_tlb_lines,
 		smmu->tlb_mask);
 
-- 
2.17.1