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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>
This commit is contained in:
Hiroshi Doyu 2012-08-28 08:13:03 +03:00 committed by Marek Szyprowski
parent 21d0a75951
commit 665bad7bb9
1 changed files with 12 additions and 0 deletions
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12
arch/arm/mm/dma-mapping.c
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@ -1136,10 +1136,22 @@ static int __iommu_remove_mapping(struct device *dev, dma_addr_t iova, size_t si
return 0;
}
static struct page **__atomic_get_pages(void *addr)
{
struct dma_pool *pool = &atomic_pool;
struct page **pages = pool->pages;
int offs = (addr - pool->vaddr) >> PAGE_SHIFT;
return pages + offs;
}
static struct page **__iommu_get_pages(void *cpu_addr, struct dma_attrs *attrs)
{
struct vm_struct *area;
if (__in_atomic_pool(cpu_addr, PAGE_SIZE))
return __atomic_get_pages(cpu_addr);
if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs))
return cpu_addr;