1 #ifndef __LINUX_SWIOTLB_H 2 #define __LINUX_SWIOTLB_H 3 4 #include <linux/types.h> 5 6 struct device; 7 struct dma_attrs; 8 struct scatterlist; 9 10 /* 11 * Maximum allowable number of contiguous slabs to map, 12 * must be a power of 2. What is the appropriate value ? 13 * The complexity of {map,unmap}_single is linearly dependent on this value. 14 */ 15 #define IO_TLB_SEGSIZE 128 16 17 /* 18 * log of the size of each IO TLB slab. The number of slabs is command line 19 * controllable. 20 */ 21 #define IO_TLB_SHIFT 11 22 23 extern void 24 swiotlb_init(void); 25 26 extern void 27 *swiotlb_alloc_coherent(struct device *hwdev, size_t size, 28 dma_addr_t *dma_handle, gfp_t flags); 29 30 extern void 31 swiotlb_free_coherent(struct device *hwdev, size_t size, 32 void *vaddr, dma_addr_t dma_handle); 33 34 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, 35 unsigned long offset, size_t size, 36 enum dma_data_direction dir, 37 struct dma_attrs *attrs); 38 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr, 39 size_t size, enum dma_data_direction dir, 40 struct dma_attrs *attrs); 41 42 extern int 43 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, 44 int direction); 45 46 extern void 47 swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents, 48 int direction); 49 50 extern int 51 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, 52 enum dma_data_direction dir, struct dma_attrs *attrs); 53 54 extern void 55 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl, 56 int nelems, enum dma_data_direction dir, 57 struct dma_attrs *attrs); 58 59 extern void 60 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr, 61 size_t size, enum dma_data_direction dir); 62 63 extern void 64 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg, 65 int nelems, enum dma_data_direction dir); 66 67 extern void 68 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr, 69 size_t size, enum dma_data_direction dir); 70 71 extern void 72 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg, 73 int nelems, enum dma_data_direction dir); 74 75 extern void 76 swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr, 77 unsigned long offset, size_t size, 78 enum dma_data_direction dir); 79 80 extern void 81 swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr, 82 unsigned long offset, size_t size, 83 enum dma_data_direction dir); 84 85 extern int 86 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr); 87 88 extern int 89 swiotlb_dma_supported(struct device *hwdev, u64 mask); 90 91 #endif /* __LINUX_SWIOTLB_H */ 92