diff options
| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2008-10-23 23:14:29 +0900 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-10-23 21:54:40 +0200 |
| commit | 03967c5267b0e7312d1d55dc814d94cf190ca573 (patch) | |
| tree | 71db8a764b7422d8c21b33fb70dc310c3659984d /kernel | |
| parent | 75bebb7f0c2a709812cccb4d3151a21b012c5cad (diff) | |
x86: restore the old swiotlb alloc_coherent behavior
This restores the old swiotlb alloc_coherent behavior (before the
alloc_coherent rewrite):
http://lkml.org/lkml/2008/8/12/200
The old alloc_coherent avoids GFP_DMA allocation first and if the
allocated address is not fit for the device's coherent_dma_mask, then
dma_alloc_coherent does GFP_DMA allocation. If it fails,
alloc_coherent calls swiotlb_alloc_coherent (in short, we rarely used
swiotlb_alloc_coherent).
After the alloc_coherent rewrite, dma_alloc_coherent
(include/asm-x86/dma-mapping.h) directly calls swiotlb_alloc_coherent.
It means that we possibly can't handle a device having dma_masks >
24bit < 32bits since swiotlb_alloc_coherent doesn't have the above
GFP_DMA retry mechanism.
This patch fixes x86's swiotlb alloc_coherent to use the GFP_DMA retry
mechanism, which dma_generic_alloc_coherent() provides now
(pci-nommu.c and GART IOMMU driver also use
dma_generic_alloc_coherent).
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions