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 int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose); 27 extern unsigned long swiotlb_nr_tbl(void); 28 unsigned long swiotlb_size_or_default(void); 29 extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs); 30 31 /* 32 * Enumeration for sync targets 33 */ 34 enum 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 42 extern 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 47 extern void swiotlb_tbl_unmap_single(struct device *hwdev, 48 phys_addr_t tlb_addr, 49 size_t size, enum dma_data_direction dir); 50 51 extern 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. */ 57 extern void 58 *swiotlb_alloc_coherent(struct device *hwdev, size_t size, 59 dma_addr_t *dma_handle, gfp_t flags); 60 61 extern void 62 swiotlb_free_coherent(struct device *hwdev, size_t size, 63 void *vaddr, dma_addr_t dma_handle); 64 65 extern 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); 69 extern 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 73 extern int 74 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, 75 enum dma_data_direction dir); 76 77 extern void 78 swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents, 79 enum dma_data_direction dir); 80 81 extern int 82 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, 83 enum dma_data_direction dir, struct dma_attrs *attrs); 84 85 extern void 86 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl, 87 int nelems, enum dma_data_direction dir, 88 struct dma_attrs *attrs); 89 90 extern void 91 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr, 92 size_t size, enum dma_data_direction dir); 93 94 extern void 95 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg, 96 int nelems, enum dma_data_direction dir); 97 98 extern void 99 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr, 100 size_t size, enum dma_data_direction dir); 101 102 extern void 103 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg, 104 int nelems, enum dma_data_direction dir); 105 106 extern int 107 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr); 108 109 extern int 110 swiotlb_dma_supported(struct device *hwdev, u64 mask); 111 112 #ifdef CONFIG_SWIOTLB 113 extern void __init swiotlb_free(void); 114 #else 115 static inline void swiotlb_free(void) { } 116 #endif 117 118 extern void swiotlb_print_info(void); 119 extern int is_swiotlb_buffer(phys_addr_t paddr); 120 121 #endif /* __LINUX_SWIOTLB_H */ 122