1 #ifndef _X8664_DMA_MAPPING_H
2 #define _X8664_DMA_MAPPING_H 1
5 * IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for
10 #include <asm/scatterlist.h>
12 #include <asm/swiotlb.h>
14 struct dma_mapping_ops {
15 int (*mapping_error)(dma_addr_t dma_addr);
16 void* (*alloc_coherent)(struct device *dev, size_t size,
17 dma_addr_t *dma_handle, gfp_t gfp);
18 void (*free_coherent)(struct device *dev, size_t size,
19 void *vaddr, dma_addr_t dma_handle);
20 dma_addr_t (*map_single)(struct device *hwdev, void *ptr,
21 size_t size, int direction);
22 /* like map_single, but doesn't check the device mask */
23 dma_addr_t (*map_simple)(struct device *hwdev, char *ptr,
24 size_t size, int direction);
25 void (*unmap_single)(struct device *dev, dma_addr_t addr,
26 size_t size, int direction);
27 void (*sync_single_for_cpu)(struct device *hwdev,
28 dma_addr_t dma_handle, size_t size,
30 void (*sync_single_for_device)(struct device *hwdev,
31 dma_addr_t dma_handle, size_t size,
33 void (*sync_single_range_for_cpu)(struct device *hwdev,
34 dma_addr_t dma_handle, unsigned long offset,
35 size_t size, int direction);
36 void (*sync_single_range_for_device)(struct device *hwdev,
37 dma_addr_t dma_handle, unsigned long offset,
38 size_t size, int direction);
39 void (*sync_sg_for_cpu)(struct device *hwdev,
40 struct scatterlist *sg, int nelems,
42 void (*sync_sg_for_device)(struct device *hwdev,
43 struct scatterlist *sg, int nelems,
45 int (*map_sg)(struct device *hwdev, struct scatterlist *sg,
46 int nents, int direction);
47 void (*unmap_sg)(struct device *hwdev,
48 struct scatterlist *sg, int nents,
50 int (*dma_supported)(struct device *hwdev, u64 mask);
54 extern dma_addr_t bad_dma_address;
55 extern struct dma_mapping_ops* dma_ops;
56 extern int iommu_merge;
58 static inline int dma_mapping_error(dma_addr_t dma_addr)
60 if (dma_ops->mapping_error)
61 return dma_ops->mapping_error(dma_addr);
63 return (dma_addr == bad_dma_address);
66 extern void *dma_alloc_coherent(struct device *dev, size_t size,
67 dma_addr_t *dma_handle, gfp_t gfp);
68 extern void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
69 dma_addr_t dma_handle);
71 static inline dma_addr_t
72 dma_map_single(struct device *hwdev, void *ptr, size_t size,
75 return dma_ops->map_single(hwdev, ptr, size, direction);
79 dma_unmap_single(struct device *dev, dma_addr_t addr,size_t size,
82 dma_ops->unmap_single(dev, addr, size, direction);
85 #define dma_map_page(dev,page,offset,size,dir) \
86 dma_map_single((dev), page_address(page)+(offset), (size), (dir))
88 #define dma_unmap_page dma_unmap_single
91 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
92 size_t size, int direction)
94 if (dma_ops->sync_single_for_cpu)
95 dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
97 flush_write_buffers();
101 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
102 size_t size, int direction)
104 if (dma_ops->sync_single_for_device)
105 dma_ops->sync_single_for_device(hwdev, dma_handle, size,
107 flush_write_buffers();
111 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
112 unsigned long offset, size_t size, int direction)
114 if (dma_ops->sync_single_range_for_cpu) {
115 dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset, size, direction);
118 flush_write_buffers();
122 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
123 unsigned long offset, size_t size, int direction)
125 if (dma_ops->sync_single_range_for_device)
126 dma_ops->sync_single_range_for_device(hwdev, dma_handle,
127 offset, size, direction);
129 flush_write_buffers();
133 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
134 int nelems, int direction)
136 if (dma_ops->sync_sg_for_cpu)
137 dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
138 flush_write_buffers();
142 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
143 int nelems, int direction)
145 if (dma_ops->sync_sg_for_device) {
146 dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
149 flush_write_buffers();
153 dma_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, int direction)
155 return dma_ops->map_sg(hwdev, sg, nents, direction);
159 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
162 dma_ops->unmap_sg(hwdev, sg, nents, direction);
165 extern int dma_supported(struct device *hwdev, u64 mask);
167 /* same for gart, swiotlb, and nommu */
168 static inline int dma_get_cache_alignment(void)
170 return boot_cpu_data.x86_clflush_size;
173 #define dma_is_consistent(h) 1
175 extern int dma_set_mask(struct device *dev, u64 mask);
178 dma_cache_sync(void *vaddr, size_t size, enum dma_data_direction dir)
180 flush_write_buffers();
183 extern struct device fallback_dev;
184 extern int panic_on_overflow;
186 #endif /* _X8664_DMA_MAPPING_H */