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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 | |
79ff56eb | 16 | void * __init swiotlb_alloc_boot(size_t size, unsigned long nslabs) |
8ce79960 JF |
17 | { |
18 | return alloc_bootmem_low_pages(size); | |
19 | } | |
20 | ||
21 | void *swiotlb_alloc(unsigned order, unsigned long nslabs) | |
22 | { | |
23 | return (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN, order); | |
24 | } | |
25 | ||
70a7d3cc | 26 | dma_addr_t swiotlb_phys_to_bus(struct device *hwdev, phys_addr_t paddr) |
1d32251e IC |
27 | { |
28 | return paddr; | |
29 | } | |
30 | ||
31 | phys_addr_t swiotlb_bus_to_phys(dma_addr_t baddr) | |
32 | { | |
33 | return baddr; | |
34 | } | |
35 | ||
0b8698ab | 36 | int __weak swiotlb_arch_range_needs_mapping(phys_addr_t paddr, size_t size) |
a0863669 IC |
37 | { |
38 | return 0; | |
39 | } | |
40 | ||
03967c52 FT |
41 | static void *x86_swiotlb_alloc_coherent(struct device *hwdev, size_t size, |
42 | dma_addr_t *dma_handle, gfp_t flags) | |
43 | { | |
44 | void *vaddr; | |
45 | ||
46 | vaddr = dma_generic_alloc_coherent(hwdev, size, dma_handle, flags); | |
47 | if (vaddr) | |
48 | return vaddr; | |
49 | ||
50 | return swiotlb_alloc_coherent(hwdev, size, dma_handle, flags); | |
51 | } | |
52 | ||
ff6c6fed | 53 | static struct dma_map_ops swiotlb_dma_ops = { |
17a941d8 | 54 | .mapping_error = swiotlb_dma_mapping_error, |
03967c52 | 55 | .alloc_coherent = x86_swiotlb_alloc_coherent, |
17a941d8 | 56 | .free_coherent = swiotlb_free_coherent, |
17a941d8 MBY |
57 | .sync_single_for_cpu = swiotlb_sync_single_for_cpu, |
58 | .sync_single_for_device = swiotlb_sync_single_for_device, | |
59 | .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu, | |
60 | .sync_single_range_for_device = swiotlb_sync_single_range_for_device, | |
61 | .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, | |
62 | .sync_sg_for_device = swiotlb_sync_sg_for_device, | |
160c1d8e FT |
63 | .map_sg = swiotlb_map_sg_attrs, |
64 | .unmap_sg = swiotlb_unmap_sg_attrs, | |
4cf37bb7 FT |
65 | .map_page = swiotlb_map_page, |
66 | .unmap_page = swiotlb_unmap_page, | |
17a941d8 MBY |
67 | .dma_supported = NULL, |
68 | }; | |
69 | ||
563aaf06 | 70 | void __init pci_swiotlb_init(void) |
17a941d8 MBY |
71 | { |
72 | /* don't initialize swiotlb if iommu=off (no_iommu=1) */ | |
cfb80c9e | 73 | #ifdef CONFIG_X86_64 |
c987d12f | 74 | if (!iommu_detected && !no_iommu && max_pfn > MAX_DMA32_PFN) |
17a941d8 | 75 | swiotlb = 1; |
cfb80c9e | 76 | #endif |
65f87d8a AK |
77 | if (swiotlb_force) |
78 | swiotlb = 1; | |
17a941d8 | 79 | if (swiotlb) { |
17a941d8 | 80 | printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n"); |
5b7b644c | 81 | swiotlb_init(); |
17a941d8 MBY |
82 | dma_ops = &swiotlb_dma_ops; |
83 | } | |
84 | } |