ARM: dma-mapping: Introduce __atomic_get_pages() for __iommu_get_pages()
Support atomic allocation in __iommu_get_pages(). Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com> [moved __atomic_get_pages() under #ifdef CONFIG_ARM_DMA_USE_IOMMU to avoid unused fuction warning for no-IOMMU case] Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
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@ -1136,10 +1136,22 @@ static int __iommu_remove_mapping(struct device *dev, dma_addr_t iova, size_t si
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return 0;
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}
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static struct page **__atomic_get_pages(void *addr)
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{
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struct dma_pool *pool = &atomic_pool;
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struct page **pages = pool->pages;
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int offs = (addr - pool->vaddr) >> PAGE_SHIFT;
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return pages + offs;
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}
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static struct page **__iommu_get_pages(void *cpu_addr, struct dma_attrs *attrs)
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{
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struct vm_struct *area;
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if (__in_atomic_pool(cpu_addr, PAGE_SIZE))
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return __atomic_get_pages(cpu_addr);
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if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs))
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return cpu_addr;
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