linux-kernel - [PATCH 1/3] iommu/tegra-smmu: Do not use PAGE_SHIFT and PAGE

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Message-Id: <20200911071643.17212-2-nicoleotsuka@gmail.com>
Date:   Fri, 11 Sep 2020 00:16:41 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     joro@...tes.org, thierry.reding@...il.com
Cc:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-tegra@...r.kernel.org, jonathanh@...dia.com,
        vdumpa@...dia.com
Subject: [PATCH 1/3] iommu/tegra-smmu: Do not use PAGE_SHIFT and PAGE_MASK

PAGE_SHIFT and PAGE_MASK are defined corresponding to the page size
for CPU virtual addresses, which means PAGE_SHIFT could be a number
other than 12, but tegra-smmu maintains fixed 4KB IOVA pages and has
fixed [21:12] bit range for PTE entries.

So this patch replaces all PAGE_SHIFT/PAGE_MASK references with the
macros defined with SMMU_PTE_SHIFT.

Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>
---
 drivers/iommu/tegra-smmu.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 046add7acb61..789d21c01b77 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -130,6 +130,11 @@ static inline u32 smmu_readl(struct tegra_smmu *smmu, unsigned long offset)
 #define SMMU_PDE_SHIFT 22
 #define SMMU_PTE_SHIFT 12
 
+#define SMMU_PAGE_MASK		(~(SMMU_SIZE_PT-1))
+#define SMMU_OFFSET_IN_PAGE(x)	((unsigned long)(x) & ~SMMU_PAGE_MASK)
+#define SMMU_PFN_PHYS(x)	((phys_addr_t)(x) << SMMU_PTE_SHIFT)
+#define SMMU_PHYS_PFN(x)	((unsigned long)((x) >> SMMU_PTE_SHIFT))
+
 #define SMMU_PD_READABLE	(1 << 31)
 #define SMMU_PD_WRITABLE	(1 << 30)
 #define SMMU_PD_NONSECURE	(1 << 29)
@@ -644,7 +649,7 @@ static void tegra_smmu_set_pte(struct tegra_smmu_as *as, unsigned long iova,
 			       u32 *pte, dma_addr_t pte_dma, u32 val)
 {
 	struct tegra_smmu *smmu = as->smmu;
-	unsigned long offset = offset_in_page(pte);
+	unsigned long offset = SMMU_OFFSET_IN_PAGE(pte);
 
 	*pte = val;
 
@@ -726,7 +731,7 @@ __tegra_smmu_map(struct iommu_domain *domain, unsigned long iova,
 		pte_attrs |= SMMU_PTE_WRITABLE;
 
 	tegra_smmu_set_pte(as, iova, pte, pte_dma,
-			   __phys_to_pfn(paddr) | pte_attrs);
+			   SMMU_PHYS_PFN(paddr) | pte_attrs);
 
 	return 0;
 }
@@ -790,7 +795,7 @@ static phys_addr_t tegra_smmu_iova_to_phys(struct iommu_domain *domain,
 
 	pfn = *pte & as->smmu->pfn_mask;
 
-	return PFN_PHYS(pfn);
+	return SMMU_PFN_PHYS(pfn);
 }
 
 static struct tegra_smmu *tegra_smmu_find(struct device_node *np)
@@ -1108,7 +1113,8 @@ struct tegra_smmu *tegra_smmu_probe(struct device *dev,
 	smmu->dev = dev;
 	smmu->mc = mc;
 
-	smmu->pfn_mask = BIT_MASK(mc->soc->num_address_bits - PAGE_SHIFT) - 1;
+	smmu->pfn_mask =
+		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;
-- 
2.17.1