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); 26int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose); 27extern unsigned long swiotlb_nr_tbl(void); 28unsigned long swiotlb_size_or_default(void); 29extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs); 30 31/* 32 * Enumeration for sync targets 33 */ 34enum dma_sync_target { 35 SYNC_FOR_CPU = 0, 36 SYNC_FOR_DEVICE = 1, 37}; 38 39/* define the last possible byte of physical address space as a mapping error */ 40#define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0) 41 42extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, 43 dma_addr_t tbl_dma_addr, 44 phys_addr_t phys, size_t size, 45 enum dma_data_direction dir); 46 47extern void swiotlb_tbl_unmap_single(struct device *hwdev, 48 phys_addr_t tlb_addr, 49 size_t size, enum dma_data_direction dir); 50 51extern void swiotlb_tbl_sync_single(struct device *hwdev, 52 phys_addr_t tlb_addr, 53 size_t size, enum dma_data_direction dir, 54 enum dma_sync_target target); 55 56/* Accessory functions. */ 57extern void 58*swiotlb_alloc_coherent(struct device *hwdev, size_t size, 59 dma_addr_t *dma_handle, gfp_t flags); 60 61extern void 62swiotlb_free_coherent(struct device *hwdev, size_t size, 63 void *vaddr, dma_addr_t dma_handle); 64 65extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, 66 unsigned long offset, size_t size, 67 enum dma_data_direction dir, 68 struct dma_attrs *attrs); 69extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr, 70 size_t size, enum dma_data_direction dir, 71 struct dma_attrs *attrs); 72 73extern int 74swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, 75 enum dma_data_direction dir); 76 77extern void 78swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents, 79 enum dma_data_direction dir); 80 81extern int 82swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, 83 enum dma_data_direction dir, struct dma_attrs *attrs); 84 85extern void 86swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl, 87 int nelems, enum dma_data_direction dir, 88 struct dma_attrs *attrs); 89 90extern void 91swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr, 92 size_t size, enum dma_data_direction dir); 93 94extern void 95swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg, 96 int nelems, enum dma_data_direction dir); 97 98extern void 99swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr, 100 size_t size, enum dma_data_direction dir); 101 102extern void 103swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg, 104 int nelems, enum dma_data_direction dir); 105 106extern int 107swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr); 108 109extern int 110swiotlb_dma_supported(struct device *hwdev, u64 mask); 111 112#ifdef CONFIG_SWIOTLB 113extern void __init swiotlb_free(void); 114#else 115static inline void swiotlb_free(void) { } 116#endif 117 118extern void swiotlb_print_info(void); 119extern int is_swiotlb_buffer(phys_addr_t paddr); 120 121#endif /* __LINUX_SWIOTLB_H */ 122