]>
Commit | Line | Data |
---|---|---|
8dd0e952 BB |
1 | /* |
2 | * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation | |
3 | * | |
4 | * Provide default implementations of the DMA mapping callbacks for | |
5 | * busses using the iommu infrastructure | |
6 | */ | |
7 | ||
8 | #include <asm/iommu.h> | |
9 | ||
10 | /* | |
11 | * Generic iommu implementation | |
12 | */ | |
13 | ||
14 | /* Allocates a contiguous real buffer and creates mappings over it. | |
15 | * Returns the virtual address of the buffer and sets dma_handle | |
16 | * to the dma address (mapping) of the first page. | |
17 | */ | |
18 | static void *dma_iommu_alloc_coherent(struct device *dev, size_t size, | |
19 | dma_addr_t *dma_handle, gfp_t flag) | |
20 | { | |
738ef42e | 21 | return iommu_alloc_coherent(dev, get_iommu_table_base(dev), size, |
8dd0e952 | 22 | dma_handle, device_to_mask(dev), flag, |
8fae0353 | 23 | dev_to_node(dev)); |
8dd0e952 BB |
24 | } |
25 | ||
26 | static void dma_iommu_free_coherent(struct device *dev, size_t size, | |
27 | void *vaddr, dma_addr_t dma_handle) | |
28 | { | |
738ef42e | 29 | iommu_free_coherent(get_iommu_table_base(dev), size, vaddr, dma_handle); |
8dd0e952 BB |
30 | } |
31 | ||
32 | /* Creates TCEs for a user provided buffer. The user buffer must be | |
f9226d57 MN |
33 | * contiguous real kernel storage (not vmalloc). The address passed here |
34 | * comprises a page address and offset into that page. The dma_addr_t | |
35 | * returned will point to the same byte within the page as was passed in. | |
8dd0e952 | 36 | */ |
f9226d57 MN |
37 | static dma_addr_t dma_iommu_map_page(struct device *dev, struct page *page, |
38 | unsigned long offset, size_t size, | |
39 | enum dma_data_direction direction, | |
40 | struct dma_attrs *attrs) | |
8dd0e952 | 41 | { |
738ef42e BB |
42 | return iommu_map_page(dev, get_iommu_table_base(dev), page, offset, |
43 | size, device_to_mask(dev), direction, attrs); | |
8dd0e952 BB |
44 | } |
45 | ||
46 | ||
f9226d57 MN |
47 | static void dma_iommu_unmap_page(struct device *dev, dma_addr_t dma_handle, |
48 | size_t size, enum dma_data_direction direction, | |
49 | struct dma_attrs *attrs) | |
8dd0e952 | 50 | { |
738ef42e | 51 | iommu_unmap_page(get_iommu_table_base(dev), dma_handle, size, direction, |
f9226d57 | 52 | attrs); |
8dd0e952 BB |
53 | } |
54 | ||
55 | ||
56 | static int dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist, | |
57 | int nelems, enum dma_data_direction direction, | |
58 | struct dma_attrs *attrs) | |
59 | { | |
738ef42e | 60 | return iommu_map_sg(dev, get_iommu_table_base(dev), sglist, nelems, |
8dd0e952 BB |
61 | device_to_mask(dev), direction, attrs); |
62 | } | |
63 | ||
64 | static void dma_iommu_unmap_sg(struct device *dev, struct scatterlist *sglist, | |
65 | int nelems, enum dma_data_direction direction, | |
66 | struct dma_attrs *attrs) | |
67 | { | |
738ef42e | 68 | iommu_unmap_sg(get_iommu_table_base(dev), sglist, nelems, direction, |
8dd0e952 BB |
69 | attrs); |
70 | } | |
71 | ||
72 | /* We support DMA to/from any memory page via the iommu */ | |
73 | static int dma_iommu_dma_supported(struct device *dev, u64 mask) | |
74 | { | |
738ef42e | 75 | struct iommu_table *tbl = get_iommu_table_base(dev); |
8dd0e952 BB |
76 | |
77 | if (!tbl || tbl->it_offset > mask) { | |
78 | printk(KERN_INFO | |
79 | "Warning: IOMMU offset too big for device mask\n"); | |
80 | if (tbl) | |
81 | printk(KERN_INFO | |
fe333321 | 82 | "mask: 0x%08llx, table offset: 0x%08lx\n", |
8dd0e952 BB |
83 | mask, tbl->it_offset); |
84 | else | |
fe333321 | 85 | printk(KERN_INFO "mask: 0x%08llx, table unavailable\n", |
8dd0e952 BB |
86 | mask); |
87 | return 0; | |
88 | } else | |
89 | return 1; | |
90 | } | |
91 | ||
45223c54 | 92 | struct dma_map_ops dma_iommu_ops = { |
8dd0e952 BB |
93 | .alloc_coherent = dma_iommu_alloc_coherent, |
94 | .free_coherent = dma_iommu_free_coherent, | |
8dd0e952 BB |
95 | .map_sg = dma_iommu_map_sg, |
96 | .unmap_sg = dma_iommu_unmap_sg, | |
97 | .dma_supported = dma_iommu_dma_supported, | |
f9226d57 MN |
98 | .map_page = dma_iommu_map_page, |
99 | .unmap_page = dma_iommu_unmap_page, | |
8dd0e952 BB |
100 | }; |
101 | EXPORT_SYMBOL(dma_iommu_ops); |