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Commit | Line | Data |
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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> | |
8ce79960 JF |
6 | #include <linux/swiotlb.h> |
7 | #include <linux/bootmem.h> | |
d6bd3a39 REB |
8 | #include <linux/dma-mapping.h> |
9 | ||
46a7fa27 | 10 | #include <asm/iommu.h> |
17a941d8 MBY |
11 | #include <asm/swiotlb.h> |
12 | #include <asm/dma.h> | |
13 | ||
14 | int swiotlb __read_mostly; | |
17a941d8 | 15 | |
03967c52 FT |
16 | static void *x86_swiotlb_alloc_coherent(struct device *hwdev, size_t size, |
17 | dma_addr_t *dma_handle, gfp_t flags) | |
18 | { | |
19 | void *vaddr; | |
20 | ||
21 | vaddr = dma_generic_alloc_coherent(hwdev, size, dma_handle, flags); | |
22 | if (vaddr) | |
23 | return vaddr; | |
24 | ||
25 | return swiotlb_alloc_coherent(hwdev, size, dma_handle, flags); | |
26 | } | |
27 | ||
ff6c6fed | 28 | static struct dma_map_ops swiotlb_dma_ops = { |
17a941d8 | 29 | .mapping_error = swiotlb_dma_mapping_error, |
03967c52 | 30 | .alloc_coherent = x86_swiotlb_alloc_coherent, |
17a941d8 | 31 | .free_coherent = swiotlb_free_coherent, |
17a941d8 MBY |
32 | .sync_single_for_cpu = swiotlb_sync_single_for_cpu, |
33 | .sync_single_for_device = swiotlb_sync_single_for_device, | |
34 | .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu, | |
35 | .sync_single_range_for_device = swiotlb_sync_single_range_for_device, | |
36 | .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, | |
37 | .sync_sg_for_device = swiotlb_sync_sg_for_device, | |
160c1d8e FT |
38 | .map_sg = swiotlb_map_sg_attrs, |
39 | .unmap_sg = swiotlb_unmap_sg_attrs, | |
4cf37bb7 FT |
40 | .map_page = swiotlb_map_page, |
41 | .unmap_page = swiotlb_unmap_page, | |
17a941d8 MBY |
42 | .dma_supported = NULL, |
43 | }; | |
44 | ||
b18485e7 | 45 | /* |
186a2502 | 46 | * pci_swiotlb_detect - set swiotlb to 1 if necessary |
b18485e7 FT |
47 | * |
48 | * This returns non-zero if we are forced to use swiotlb (by the boot | |
49 | * option). | |
50 | */ | |
186a2502 | 51 | int __init pci_swiotlb_detect(void) |
17a941d8 | 52 | { |
273bee27 FT |
53 | int use_swiotlb = swiotlb | swiotlb_force; |
54 | ||
17a941d8 | 55 | /* don't initialize swiotlb if iommu=off (no_iommu=1) */ |
cfb80c9e | 56 | #ifdef CONFIG_X86_64 |
75f1cdf1 | 57 | if (!no_iommu && max_pfn > MAX_DMA32_PFN) |
19943b0e | 58 | swiotlb = 1; |
cfb80c9e | 59 | #endif |
b18485e7 FT |
60 | if (swiotlb_force) |
61 | swiotlb = 1; | |
62 | ||
186a2502 FT |
63 | return use_swiotlb; |
64 | } | |
65 | ||
66 | void __init pci_swiotlb_init(void) | |
67 | { | |
17a941d8 | 68 | if (swiotlb) { |
ad32e8cb | 69 | swiotlb_init(0); |
17a941d8 | 70 | dma_ops = &swiotlb_dma_ops; |
a3b28ee1 | 71 | } |
17a941d8 | 72 | } |