[PATCH] x86_64: Use function pointers to call DMA mapping functions
[linux-2.6.git] / arch / x86_64 / kernel / pci-swiotlb.c
1 /* Glue code to lib/swiotlb.c */
2
3 #include <linux/pci.h>
4 #include <linux/cache.h>
5 #include <linux/module.h>
6 #include <asm/dma-mapping.h>
7 #include <asm/proto.h>
8 #include <asm/swiotlb.h>
9 #include <asm/dma.h>
10
11 int swiotlb __read_mostly;
12 EXPORT_SYMBOL(swiotlb);
13
14 struct dma_mapping_ops swiotlb_dma_ops = {
15         .mapping_error = swiotlb_dma_mapping_error,
16         .alloc_coherent = swiotlb_alloc_coherent,
17         .free_coherent = swiotlb_free_coherent,
18         .map_single = swiotlb_map_single,
19         .unmap_single = swiotlb_unmap_single,
20         .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
21         .sync_single_for_device = swiotlb_sync_single_for_device,
22         .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu,
23         .sync_single_range_for_device = swiotlb_sync_single_range_for_device,
24         .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
25         .sync_sg_for_device = swiotlb_sync_sg_for_device,
26         .map_sg = swiotlb_map_sg,
27         .unmap_sg = swiotlb_unmap_sg,
28         .dma_supported = NULL,
29 };
30
31 void pci_swiotlb_init(void)
32 {
33         /* don't initialize swiotlb if iommu=off (no_iommu=1) */
34         if (!iommu_aperture && !no_iommu &&
35             (end_pfn > MAX_DMA32_PFN || force_iommu))
36                swiotlb = 1;
37         if (swiotlb) {
38                 swiotlb_init();
39                 printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n");
40                 dma_ops = &swiotlb_dma_ops;
41         }
42 }