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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2008-09-10 20:19:40 +0900 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-09-19 12:59:24 +0200 |
| commit | 13d9fead3daa0efa1b8bb6ae59650e4453b39128 (patch) | |
| tree | efbfb74d7f5f11f50ca103686a726dad8398e9e0 | |
| parent | 38ddf41b198e21d3ecbe5752e875857b7ce7589e (diff) | |
| download | blackbird-op-linux-13d9fead3daa0efa1b8bb6ae59650e4453b39128.tar.gz blackbird-op-linux-13d9fead3daa0efa1b8bb6ae59650e4453b39128.zip | |
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>
| -rw-r--r-- | arch/x86/kernel/amd_iommu.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index a34d8e915e3a..e4866660463e 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -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; |
