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x86: export pci-nommu's alloc_coherent

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This patch exports nommu_alloc_coherent (renamed
dma_generic_alloc_coherent). GART needs this function.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
FUJITA Tomonori
2008-09-24 20:48:35 +09:00
committed by Ingo Molnar
parent afa9fdc2f5
commit 9f6ac57729
3 changed files with 35 additions and 38 deletions
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31
arch/x86/kernel/pci-dma.c
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@@ -134,6 +134,37 @@ unsigned long iommu_num_pages(unsigned long addr, unsigned long len)
EXPORT_SYMBOL(iommu_num_pages);
#endif
void *dma_generic_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_addr, gfp_t flag)
{
unsigned long dma_mask;
struct page *page;
dma_addr_t addr;
dma_mask = dma_alloc_coherent_mask(dev, flag);
flag |= __GFP_ZERO;
again:
page = alloc_pages_node(dev_to_node(dev), flag, get_order(size));
if (!page)
return NULL;
addr = page_to_phys(page);
if (!is_buffer_dma_capable(dma_mask, addr, size)) {
__free_pages(page, get_order(size));
if (dma_mask < DMA_32BIT_MASK && !(flag & GFP_DMA)) {
flag = (flag & ~GFP_DMA32) | GFP_DMA;
goto again;
}
return NULL;
}
*dma_addr = addr;
return page_address(page);
}
/*
* See <Documentation/x86_64/boot-options.txt> for the iommu kernel parameter
* documentation.