diff options
| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2008-09-11 23:08:48 +0900 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-09-14 16:43:58 +0200 |
| commit | f6a32a36ab96016675cd414802904feb288d7899 (patch) | |
| tree | 1782f3b01261ea952da18208c20f9d30370856ba /arch/x86/kernel/pci-gart_64.c | |
| parent | f10ac8a232496bf9271cfc67c6eea432891f04a6 (diff) | |
x86: gart alloc_coherent does virtual mapppings only when necessary
gart alloc_coherent need to do virtual mapppings only when an
allocated buffer is not DMA-capable for a device.
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/kernel/pci-gart_64.c')
| -rw-r--r-- | arch/x86/kernel/pci-gart_64.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c index 9972c42ac925..9739d5682093 100644 --- a/arch/x86/kernel/pci-gart_64.c +++ b/arch/x86/kernel/pci-gart_64.c @@ -505,15 +505,23 @@ gart_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_addr, gfp_t flag) { void *vaddr; + dma_addr_t paddr; unsigned long align_mask; + u64 dma_mask = dma_alloc_coherent_mask(dev, flag); vaddr = (void *)__get_free_pages(flag | __GFP_ZERO, get_order(size)); if (!vaddr) return NULL; + paddr = virt_to_phys(vaddr); + if (is_buffer_dma_capable(dma_mask, paddr, size)) { + *dma_addr = paddr; + return vaddr; + } + align_mask = (1UL << get_order(size)) - 1; - *dma_addr = dma_map_area(dev, __pa(vaddr), size, DMA_BIDIRECTIONAL, + *dma_addr = dma_map_area(dev, paddr, size, DMA_BIDIRECTIONAL, align_mask, dma_mask); flush_gart(); |