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Diffstat (limited to 'arch/x86/kernel/pci-gart_64.c')
-rw-r--r--arch/x86/kernel/pci-gart_64.c21
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)