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| author |   Russell King <rmk+kernel@arm.linux.org.uk> | 2015-08-06 14:56:39 +0200 |
|---|---|---|
| committer |   Thierry Reding <treding@nvidia.com> | 2015-08-13 16:06:43 +0200 |
| commit | 7ffc6f066eb73b07a0ef7c94d05107aef271ac21 (patch) | |
| tree | 976b618114e7527e91d1c234bcd710ca6afec72e /drivers/iommu/tegra-smmu.c | |
| parent | iommu/tegra-smmu: Use __GFP_ZERO to allocate zeroed pages (diff) | |
| download | linux-dev-7ffc6f066eb73b07a0ef7c94d05107aef271ac21.tar.xz linux-dev-7ffc6f066eb73b07a0ef7c94d05107aef271ac21.zip | |
iommu/tegra-smmu: Extract tegra_smmu_pte_get_use()
Extract the use count reference accounting into a separate function and
separate it from allocating the PTE.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
[treding@nvidia.com: extract and write commit message]
Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'drivers/iommu/tegra-smmu.c')
| -rw-r--r-- | drivers/iommu/tegra-smmu.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c index 27d31f62a822..74ad1f43265a 100644 --- a/drivers/iommu/tegra-smmu.c +++ b/drivers/iommu/tegra-smmu.c @@ -522,7 +522,7 @@ static u32 *tegra_smmu_pte_lookup(struct tegra_smmu_as *as, unsigned long iova, static u32 *as_get_pte(struct tegra_smmu_as *as, dma_addr_t iova, dma_addr_t *dmap) { - u32 *pd = page_address(as->pd), *pt; + u32 *pd = page_address(as->pd); unsigned int pde = iova_pd_index(iova); struct tegra_smmu *smmu = as->smmu; @@ -563,13 +563,14 @@ static u32 *as_get_pte(struct tegra_smmu_as *as, dma_addr_t iova, *dmap = smmu_pde_to_dma(pd[pde]); } - pt = tegra_smmu_pte_offset(as->pts[pde], iova); + return tegra_smmu_pte_offset(as->pts[pde], iova); +} - /* Keep track of entries in this page table. */ - if (*pt == 0) - as->count[pde]++; +static void tegra_smmu_pte_get_use(struct tegra_smmu_as *as, unsigned long iova) +{ + unsigned int pd_index = iova_pd_index(iova); - return pt; + as->count[pd_index]++; } static void tegra_smmu_pte_put_use(struct tegra_smmu_as *as, unsigned long iova) @@ -630,6 +631,10 @@ static int tegra_smmu_map(struct iommu_domain *domain, unsigned long iova, if (!pte) return -ENOMEM; + /* If we aren't overwriting a pre-existing entry, increment use */ + if (*pte == 0) + tegra_smmu_pte_get_use(as, iova); + tegra_smmu_set_pte(as, iova, pte, pte_dma, __phys_to_pfn(paddr) | SMMU_PTE_ATTR); |