diff options
Diffstat (limited to 'arch/x86/kernel/pci-gart_64.c')
| -rw-r--r-- | arch/x86/kernel/pci-gart_64.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c index 49285f8fd4d5..076e64b2d4f3 100644 --- a/arch/x86/kernel/pci-gart_64.c +++ b/arch/x86/kernel/pci-gart_64.c @@ -499,6 +499,26 @@ error: return 0; } +/* allocate and map a coherent mapping */ +static void * +gart_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_addr, + gfp_t flag) +{ + void *vaddr; + + vaddr = (void *)__get_free_pages(flag | __GFP_ZERO, get_order(size)); + if (!vaddr) + return NULL; + + *dma_addr = gart_map_single(dev, __pa(vaddr), size, DMA_BIDIRECTIONAL); + if (*dma_addr != bad_dma_address) + return vaddr; + + free_pages((unsigned long)vaddr, get_order(size)); + + return NULL; +} + static int no_agp; static __init unsigned long check_iommu_size(unsigned long aper, u64 aper_size) @@ -701,6 +721,7 @@ static struct dma_mapping_ops gart_dma_ops = { .sync_sg_for_device = NULL, .map_sg = gart_map_sg, .unmap_sg = gart_unmap_sg, + .alloc_coherent = gart_alloc_coherent, }; void gart_iommu_shutdown(void) |