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AMD IOMMU: avoid unnecessary low zone allocation in alloc_coherent 

x86's common alloc_coherent (dma_alloc_coherent in dma-mapping.h) sets
up the gfp flag according to the device dma_mask but AMD IOMMU doesn't
need it for devices that the IOMMU can do virtual mappings for. This
patch avoids unnecessary low zone allocation.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
FUJITA Tomonori 2008-09-10 20:19:40 +09:00 committed by Ingo Molnar
parent 38ddf41b19
commit 13d9fead3d
1 changed files with 3 additions and 2 deletions
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5
arch/x86/kernel/amd_iommu.c
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@ -1173,6 +1173,9 @@ static void *alloc_coherent(struct device *dev, size_t size,
if (!check_device(dev))
return NULL;
if (!get_device_resources(dev, &iommu, &domain, &devid))
flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
virt_addr = (void *)__get_free_pages(flag, get_order(size));
if (!virt_addr)
return 0;
@ -1180,8 +1183,6 @@ static void *alloc_coherent(struct device *dev, size_t size,
memset(virt_addr, 0, size);
paddr = virt_to_phys(virt_addr);
get_device_resources(dev, &iommu, &domain, &devid);
if (!iommu || !domain) {
*dma_addr = (dma_addr_t)paddr;
return virt_addr;