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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2008-09-11 23:08:48 +0900
committerIngo Molnar <mingo@elte.hu>2008-09-14 16:43:58 +0200
commitf6a32a36ab96016675cd414802904feb288d7899 (patch)
tree1782f3b01261ea952da18208c20f9d30370856ba /arch/x86/kernel/pci-gart_64.c
parentf10ac8a232496bf9271cfc67c6eea432891f04a6 (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.c10
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();