projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 17a941d8 MBY |
1 | /* Glue code to lib/swiotlb.c */ |
| 2 | ||
| 3 | #include <linux/pci.h> | |
| 4 | #include <linux/cache.h> | |
| 5 | #include <linux/module.h> | |
| d6bd3a39 REB |
6 | #include <linux/dma-mapping.h> |
| 7 | ||
| 46a7fa27 | 8 | #include <asm/iommu.h> |
| 17a941d8 MBY |
9 | #include <asm/swiotlb.h> |
| 10 | #include <asm/dma.h> | |
| 11 | ||
| 12 | int swiotlb __read_mostly; | |
| 17a941d8 | 13 | |
| 2be62149 IM |
14 | static dma_addr_t |
| 15 | swiotlb_map_single_phys(struct device *hwdev, phys_addr_t paddr, size_t size, | |
| 16 | int direction) | |
| 17 | { | |
| 18 | return swiotlb_map_single(hwdev, phys_to_virt(paddr), size, direction); | |
| 19 | } | |
| 20 | ||
| 03967c52 FT |
21 | static void *x86_swiotlb_alloc_coherent(struct device *hwdev, size_t size, |
| 22 | dma_addr_t *dma_handle, gfp_t flags) | |
| 23 | { | |
| 24 | void *vaddr; | |
| 25 | ||
| 26 | vaddr = dma_generic_alloc_coherent(hwdev, size, dma_handle, flags); | |
| 27 | if (vaddr) | |
| 28 | return vaddr; | |
| 29 | ||
| 30 | return swiotlb_alloc_coherent(hwdev, size, dma_handle, flags); | |
| 31 | } | |
| 32 | ||
| 8d8bb39b | 33 | struct dma_mapping_ops swiotlb_dma_ops = { |
| 17a941d8 | 34 | .mapping_error = swiotlb_dma_mapping_error, |
| 03967c52 | 35 | .alloc_coherent = x86_swiotlb_alloc_coherent, |
| 17a941d8 | 36 | .free_coherent = swiotlb_free_coherent, |
| 2be62149 | 37 | .map_single = swiotlb_map_single_phys, |
| 17a941d8 MBY |
38 | .unmap_single = swiotlb_unmap_single, |
| 39 | .sync_single_for_cpu = swiotlb_sync_single_for_cpu, | |
| 40 | .sync_single_for_device = swiotlb_sync_single_for_device, | |
| 41 | .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu, | |
| 42 | .sync_single_range_for_device = swiotlb_sync_single_range_for_device, | |
| 43 | .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, | |
| 44 | .sync_sg_for_device = swiotlb_sync_sg_for_device, | |
| 45 | .map_sg = swiotlb_map_sg, | |
| 46 | .unmap_sg = swiotlb_unmap_sg, | |
| 47 | .dma_supported = NULL, | |
| 48 | }; | |
| 49 | ||
| 563aaf06 | 50 | void __init pci_swiotlb_init(void) |
| 17a941d8 MBY |
51 | { |
| 52 | /* don't initialize swiotlb if iommu=off (no_iommu=1) */ | |
| c987d12f | 53 | if (!iommu_detected && !no_iommu && max_pfn > MAX_DMA32_PFN) |
| 17a941d8 | 54 | swiotlb = 1; |
| 65f87d8a AK |
55 | if (swiotlb_force) |
| 56 | swiotlb = 1; | |
| 17a941d8 | 57 | if (swiotlb) { |
| 17a941d8 | 58 | printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n"); |
| 5b7b644c | 59 | swiotlb_init(); |
| 17a941d8 MBY |
60 | dma_ops = &swiotlb_dma_ops; |
| 61 | } | |
| 62 | } |