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iommu/tegra-smmu: Factor out tegra_smmu_set_pde()
This code is used both when creating a new page directory entry and when tearing it down, with only the PDE value changing between both cases. Factor the code out so that it can be reused. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> [treding@nvidia.com: make commit message more accurate] Signed-off-by: Thierry Reding <treding@nvidia.com>
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7ffc6f066e
commit
4080e99b83
1 changed files with 28 additions and 21 deletions
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@ -495,6 +495,27 @@ static void tegra_smmu_detach_dev(struct iommu_domain *domain, struct device *de
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}
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}
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static void tegra_smmu_set_pde(struct tegra_smmu_as *as, unsigned long iova,
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u32 value)
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{
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unsigned int pd_index = iova_pd_index(iova);
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struct tegra_smmu *smmu = as->smmu;
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u32 *pd = page_address(as->pd);
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unsigned long offset = pd_index * sizeof(*pd);
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/* Set the page directory entry first */
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pd[pd_index] = value;
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/* The flush the page directory entry from caches */
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dma_sync_single_range_for_device(smmu->dev, as->pd_dma, offset,
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sizeof(*pd), DMA_TO_DEVICE);
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/* And flush the iommu */
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smmu_flush_ptc(smmu, as->pd_dma, offset);
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smmu_flush_tlb_section(smmu, as->id, iova);
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smmu_flush(smmu);
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}
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static u32 *tegra_smmu_pte_offset(struct page *pt_page, unsigned long iova)
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{
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u32 *pt = page_address(pt_page);
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@ -522,7 +543,6 @@ static u32 *tegra_smmu_pte_lookup(struct tegra_smmu_as *as, unsigned long iova,
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static u32 *as_get_pte(struct tegra_smmu_as *as, dma_addr_t iova,
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dma_addr_t *dmap)
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{
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u32 *pd = page_address(as->pd);
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unsigned int pde = iova_pd_index(iova);
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struct tegra_smmu *smmu = as->smmu;
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@ -550,16 +570,13 @@ static u32 *as_get_pte(struct tegra_smmu_as *as, dma_addr_t iova,
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as->pts[pde] = page;
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pd[pde] = SMMU_MK_PDE(dma, SMMU_PDE_ATTR | SMMU_PDE_NEXT);
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dma_sync_single_range_for_device(smmu->dev, as->pd_dma,
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pde << 2, 4, DMA_TO_DEVICE);
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smmu_flush_ptc(smmu, as->pd_dma, pde << 2);
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smmu_flush_tlb_section(smmu, as->id, iova);
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smmu_flush(smmu);
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tegra_smmu_set_pde(as, iova, SMMU_MK_PDE(dma, SMMU_PDE_ATTR |
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SMMU_PDE_NEXT));
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*dmap = dma;
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} else {
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u32 *pd = page_address(as->pd);
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*dmap = smmu_pde_to_dma(pd[pde]);
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}
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@ -575,9 +592,7 @@ static void tegra_smmu_pte_get_use(struct tegra_smmu_as *as, unsigned long iova)
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static void tegra_smmu_pte_put_use(struct tegra_smmu_as *as, unsigned long iova)
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{
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struct tegra_smmu *smmu = as->smmu;
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unsigned int pde = iova_pd_index(iova);
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u32 *pd = page_address(as->pd);
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struct page *page = as->pts[pde];
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/*
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@ -585,20 +600,12 @@ static void tegra_smmu_pte_put_use(struct tegra_smmu_as *as, unsigned long iova)
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* memory page to the system.
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*/
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if (--as->count[pde] == 0) {
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unsigned int offset = pde * sizeof(*pd);
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struct tegra_smmu *smmu = as->smmu;
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u32 *pd = page_address(as->pd);
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dma_addr_t pte_dma = smmu_pde_to_dma(pd[pde]);
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/* Clear the page directory entry first */
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pd[pde] = 0;
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tegra_smmu_set_pde(as, iova, 0);
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/* Flush the page directory entry */
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dma_sync_single_range_for_device(smmu->dev, as->pd_dma, offset,
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sizeof(*pd), DMA_TO_DEVICE);
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smmu_flush_ptc(smmu, as->pd_dma, offset);
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smmu_flush_tlb_section(smmu, as->id, iova);
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smmu_flush(smmu);
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/* Finally, free the page */
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dma_unmap_page(smmu->dev, pte_dma, SMMU_SIZE_PT, DMA_TO_DEVICE);
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__free_page(page);
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as->pts[pde] = NULL;
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