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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>
This commit is contained in:
Russell King 2015-07-27 13:29:16 +01:00 committed by Thierry Reding
parent 8482ee5ea1
commit 34d35f8cbe
1 changed files with 13 additions and 3 deletions
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16
drivers/iommu/tegra-smmu.c
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@ -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;