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 extern 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 25 extern void swiotlb_init(int verbose); 26 extern void swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose); 27 extern unsigned long swiotlb_nr_tbl(void); 28 extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs); 29 30 /* 31 * Enumeration for sync targets 32 */ 33 enum dma_sync_target { 34 SYNC_FOR_CPU = 0, 35 SYNC_FOR_DEVICE = 1, 36 }; 37 38 /* define the last possible byte of physical address space as a mapping error */ 39 #define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0) 40 41 extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, 42 dma_addr_t tbl_dma_addr, 43 phys_addr_t phys, size_t size, 44 enum dma_data_direction dir); 45 46 extern void swiotlb_tbl_unmap_single(struct device *hwdev, 47 phys_addr_t tlb_addr, 48 size_t size, enum dma_data_direction dir); 49 50 extern void swiotlb_tbl_sync_single(struct device *hwdev, 51 phys_addr_t tlb_addr, 52 size_t size, enum dma_data_direction dir, 53 enum dma_sync_target target); 54 55 /* Accessory functions. */ 56 extern void 57 *swiotlb_alloc_coherent(struct device *hwdev, size_t size, 58 dma_addr_t *dma_handle, gfp_t flags); 59 60 extern void 61 swiotlb_free_coherent(struct device *hwdev, size_t size, 62 void *vaddr, dma_addr_t dma_handle); 63 64 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, 65 unsigned long offset, size_t size, 66 enum dma_data_direction dir, 67 struct dma_attrs *attrs); 68 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr, 69 size_t size, enum dma_data_direction dir, 70 struct dma_attrs *attrs); 71 72 extern int 73 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, 74 enum dma_data_direction dir); 75 76 extern void 77 swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents, 78 enum dma_data_direction dir); 79 80 extern int 81 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, 82 enum dma_data_direction dir, struct dma_attrs *attrs); 83 84 extern void 85 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl, 86 int nelems, enum dma_data_direction dir, 87 struct dma_attrs *attrs); 88 89 extern void 90 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr, 91 size_t size, enum dma_data_direction dir); 92 93 extern void 94 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg, 95 int nelems, enum dma_data_direction dir); 96 97 extern void 98 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr, 99 size_t size, enum dma_data_direction dir); 100 101 extern void 102 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg, 103 int nelems, enum dma_data_direction dir); 104 105 extern int 106 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr); 107 108 extern int 109 swiotlb_dma_supported(struct device *hwdev, u64 mask); 110 111 #ifdef CONFIG_SWIOTLB 112 extern void __init swiotlb_free(void); 113 #else 114 static inline void swiotlb_free(void) { } 115 #endif 116 117 extern void swiotlb_print_info(void); 118 #endif /* __LINUX_SWIOTLB_H */ 119