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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2008-09-08 18:10:13 +0900
committerIngo Molnar <mingo@elte.hu>2008-09-08 15:50:07 +0200
commit823e7e8c6ef12cd1943dc42fe7595ca74e8cc3d7 (patch)
tree56f4b01741353ad4d24f24adeeedd68eaa041354 /arch/x86
parent8a53ad675f86ee003482b557da944e070d3c4859 (diff)
x86: dma_alloc_coherent sets gfp flags properly
Non real IOMMU implemenations (which doesn't do virtual mappings, e.g. swiotlb, pci-nommu, etc) need to use proper gfp flags and dma_mask to allocate pages in their own dma_alloc_coherent() (allocated page need to be suitable for device's coherent_dma_mask). This patch makes dma_alloc_coherent do this job so that IOMMUs don't need to take care of it any more. Real IOMMU implemenataions can simply ignore the gfp flags. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kernel/pci-nommu.c19
1 files changed, 2 insertions, 17 deletions
diff --git a/arch/x86/kernel/pci-nommu.c b/arch/x86/kernel/pci-nommu.c
index ada1c87cafc..8e398b56f50 100644
--- a/arch/x86/kernel/pci-nommu.c
+++ b/arch/x86/kernel/pci-nommu.c
@@ -80,26 +80,11 @@ nommu_alloc_coherent(struct device *hwdev, size_t size,
int node;
struct page *page;
- gfp |= __GFP_ZERO;
-
- dma_mask = hwdev->coherent_dma_mask;
- if (!dma_mask)
- dma_mask = *(hwdev->dma_mask);
+ dma_mask = dma_alloc_coherent_mask(hwdev, gfp);
- if (dma_mask < DMA_24BIT_MASK)
- return NULL;
+ gfp |= __GFP_ZERO;
node = dev_to_node(hwdev);
-
-#ifdef CONFIG_X86_64
- if (dma_mask <= DMA_32BIT_MASK && !(gfp & GFP_DMA))
- gfp |= GFP_DMA32;
-#endif
-
- /* No alloc-free penalty for ISA devices */
- if (dma_mask == DMA_24BIT_MASK)
- gfp |= GFP_DMA;
-
again:
page = alloc_pages_node(node, gfp, get_order(size));
if (!page)