x86 gart: allocate size-aligned address for alloc_coherent, v2

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This patch changes GART IOMMU to return a size aligned address wrt
dma_alloc_coherent, as DMA-mapping.txt defines:

The cpu return address and the DMA bus master address are both
guaranteed to be aligned to the smallest PAGE_SIZE order which
is greater than or equal to the requested size.  This invariant
exists (for example) to guarantee that if you allocate a chunk
which is smaller than or equal to 64 kilobytes, the extent of the
buffer you receive will not cross a 64K boundary.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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FUJITA Tomonori 2008-08-18 00:36:18 +09:00 • committed by Ingo Molnar

parent f3efbe582b

commit 7b22ff5344

1 changed files with 16 additions and 9 deletions

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arch/x86/kernel/pci-gart_64.c

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