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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-07-27 13:29:16 +0100 |
|---|---|---|
| committer | Thierry Reding <treding@nvidia.com> | 2015-08-13 16:06:38 +0200 |
| commit | 34d35f8cbe51bf93faf3214ee5b5d6f8ae7df4c1 (patch) | |
| tree | ce4e87831235e429cbfb5e0d36ae0f052ae53701 /drivers/iommu | |
| parent | 8482ee5ea1097445f6498ee522965f5311667763 (diff) | |
| download | linux-34d35f8cbe51bf93faf3214ee5b5d6f8ae7df4c1.tar.bz2 | |
iommu/tegra-smmu: Add iova_pd_index() and iova_pt_index() helpers
Add a pair of helpers to get the page directory and page table indexes.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/tegra-smmu.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c index 53d0f15dac6f..4c4bc7966046 100644 --- a/drivers/iommu/tegra-smmu.c +++ b/drivers/iommu/tegra-smmu.c @@ -134,6 +134,16 @@ static inline u32 smmu_readl(struct tegra_smmu *smmu, unsigned long offset) #define SMMU_PTE_ATTR (SMMU_PTE_READABLE | SMMU_PTE_WRITABLE | \ SMMU_PTE_NONSECURE) +static unsigned int iova_pd_index(unsigned long iova) +{ + return (iova >> SMMU_PDE_SHIFT) & (SMMU_NUM_PDE - 1); +} + +static unsigned int iova_pt_index(unsigned long iova) +{ + return (iova >> SMMU_PTE_SHIFT) & (SMMU_NUM_PTE - 1); +} + static inline void smmu_flush_ptc(struct tegra_smmu *smmu, struct page *page, unsigned long offset) { @@ -469,8 +479,8 @@ static u32 *as_get_pte(struct tegra_smmu_as *as, dma_addr_t iova, struct page **pagep) { u32 *pd = page_address(as->pd), *pt, *count; - u32 pde = (iova >> SMMU_PDE_SHIFT) & 0x3ff; - u32 pte = (iova >> SMMU_PTE_SHIFT) & 0x3ff; + unsigned int pde = iova_pd_index(iova); + unsigned int pte = iova_pt_index(iova); struct tegra_smmu *smmu = as->smmu; struct page *page; unsigned int i; @@ -512,7 +522,7 @@ static u32 *as_get_pte(struct tegra_smmu_as *as, dma_addr_t iova, static void tegra_smmu_pte_put_use(struct tegra_smmu_as *as, unsigned long iova) { struct tegra_smmu *smmu = as->smmu; - u32 pde = (iova >> SMMU_PDE_SHIFT) & 0x3ff; + unsigned int pde = iova_pd_index(iova); u32 *count = page_address(as->count); u32 *pd = page_address(as->pd); struct page *page; |