MLK-15007-1 iommu: arm: pgtable: alloc pagetable in DMA area
Normally the iommu pagetable could be in 64bit address space, but we have one patch to address PCIE driver, 'commit 9e03e5076269 ("MLK-15064-2 ARM64: DMA: limit the dma mask to be 32bit")' The patch restrict swiotlb and iommu dma to be in 32bit address. So if we allocate pages in highmem, then dma_map_single will return a 32bit address. Then, we will get "Cannot accommodate DMA translation for IOMMU page tables", because `dma != virt_to_phys(pages)`. So we strict the lpae iommu pgtable in DMA area to fix this issue. Signed-off-by: Peng Fan <peng.fan@nxp.com>pull/10/head
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@ -14,6 +14,7 @@
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright (C) 2014 ARM Limited
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* Copyright 2017 NXP
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*
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* Author: Will Deacon <will.deacon@arm.com>
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*/
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@ -215,7 +216,7 @@ static void *__arm_lpae_alloc_pages(size_t size, gfp_t gfp,
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{
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struct device *dev = cfg->iommu_dev;
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dma_addr_t dma;
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void *pages = alloc_pages_exact(size, gfp | __GFP_ZERO);
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void *pages = alloc_pages_exact(size, gfp | __GFP_ZERO | __GFP_DMA);
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if (!pages)
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return NULL;
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