1#ifndef __LINUX_SWIOTLB_H 2#define __LINUX_SWIOTLB_H 3 4#include <linux/types.h> 5 6struct device; 7struct dma_attrs; 8struct scatterlist; 9 10extern int swiotlb_force; 11 12/* 13 * Maximum allowable number of contiguous slabs to map, 14 * must be a power of 2. What is the appropriate value ? 15 * The complexity of {map,unmap}_single is linearly dependent on this value. 16 */ 17#define IO_TLB_SEGSIZE 128 18 19/* 20 * log of the size of each IO TLB slab. The number of slabs is command line 21 * controllable. 22 */ 23#define IO_TLB_SHIFT 11 24 25extern void swiotlb_init(int verbose); 26extern void swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose); 27 28/* 29 * Enumeration for sync targets 30 */ 31enum dma_sync_target { 32 SYNC_FOR_CPU = 0, 33 SYNC_FOR_DEVICE = 1, 34}; 35extern void *swiotlb_tbl_map_single(struct device *hwdev, dma_addr_t tbl_dma_addr, 36 phys_addr_t phys, size_t size, 37 enum dma_data_direction dir); 38 39extern void swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr, 40 size_t size, enum dma_data_direction dir); 41 42extern void swiotlb_tbl_sync_single(struct device *hwdev, char *dma_addr, 43 size_t size, enum dma_data_direction dir, 44 enum dma_sync_target target); 45 46/* Accessory functions. */ 47extern void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size, 48 enum dma_data_direction dir); 49 50extern void 51*swiotlb_alloc_coherent(struct device *hwdev, size_t size, 52 dma_addr_t *dma_handle, gfp_t flags); 53 54extern void 55swiotlb_free_coherent(struct device *hwdev, size_t size, 56 void *vaddr, dma_addr_t dma_handle); 57 58extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, 59 unsigned long offset, size_t size, 60 enum dma_data_direction dir, 61 struct dma_attrs *attrs); 62extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr, 63 size_t size, enum dma_data_direction dir, 64 struct dma_attrs *attrs); 65 66extern int 67swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, 68 enum dma_data_direction dir); 69 70extern void 71swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents, 72 enum dma_data_direction dir); 73 74extern int 75swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, 76 enum dma_data_direction dir, struct dma_attrs *attrs); 77 78extern void 79swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl, 80 int nelems, enum dma_data_direction dir, 81 struct dma_attrs *attrs); 82 83extern void 84swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr, 85 size_t size, enum dma_data_direction dir); 86 87extern void 88swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg, 89 int nelems, enum dma_data_direction dir); 90 91extern void 92swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr, 93 size_t size, enum dma_data_direction dir); 94 95extern void 96swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg, 97 int nelems, enum dma_data_direction dir); 98 99extern int 100swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr); 101 102extern int 103swiotlb_dma_supported(struct device *hwdev, u64 mask); 104 105#ifdef CONFIG_SWIOTLB 106extern void __init swiotlb_free(void); 107#else 108static inline void swiotlb_free(void) { } 109#endif 110 111extern void swiotlb_print_info(void); 112#endif /* __LINUX_SWIOTLB_H */ 113