1 #ifndef __LINUX_SWIOTLB_H 2 #define __LINUX_SWIOTLB_H 3 4 #include <linux/dma-direction.h> 5 #include <linux/init.h> 6 #include <linux/types.h> 7 8 struct device; 9 struct dma_attrs; 10 struct page; 11 struct scatterlist; 12 13 extern int swiotlb_force; 14 15 /* 16 * Maximum allowable number of contiguous slabs to map, 17 * must be a power of 2. What is the appropriate value ? 18 * The complexity of {map,unmap}_single is linearly dependent on this value. 19 */ 20 #define IO_TLB_SEGSIZE 128 21 22 /* 23 * log of the size of each IO TLB slab. The number of slabs is command line 24 * controllable. 25 */ 26 #define IO_TLB_SHIFT 11 27 28 extern void swiotlb_init(int verbose); 29 int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose); 30 extern unsigned long swiotlb_nr_tbl(void); 31 unsigned long swiotlb_size_or_default(void); 32 extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs); 33 34 /* 35 * Enumeration for sync targets 36 */ 37 enum dma_sync_target { 38 SYNC_FOR_CPU = 0, 39 SYNC_FOR_DEVICE = 1, 40 }; 41 42 /* define the last possible byte of physical address space as a mapping error */ 43 #define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0) 44 45 extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, 46 dma_addr_t tbl_dma_addr, 47 phys_addr_t phys, size_t size, 48 enum dma_data_direction dir); 49 50 extern void swiotlb_tbl_unmap_single(struct device *hwdev, 51 phys_addr_t tlb_addr, 52 size_t size, enum dma_data_direction dir); 53 54 extern void swiotlb_tbl_sync_single(struct device *hwdev, 55 phys_addr_t tlb_addr, 56 size_t size, enum dma_data_direction dir, 57 enum dma_sync_target target); 58 59 /* Accessory functions. */ 60 extern void 61 *swiotlb_alloc_coherent(struct device *hwdev, size_t size, 62 dma_addr_t *dma_handle, gfp_t flags); 63 64 extern void 65 swiotlb_free_coherent(struct device *hwdev, size_t size, 66 void *vaddr, dma_addr_t dma_handle); 67 68 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, 69 unsigned long offset, size_t size, 70 enum dma_data_direction dir, 71 struct dma_attrs *attrs); 72 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr, 73 size_t size, enum dma_data_direction dir, 74 struct dma_attrs *attrs); 75 76 extern int 77 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, 78 enum dma_data_direction dir); 79 80 extern void 81 swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents, 82 enum dma_data_direction dir); 83 84 extern int 85 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, 86 enum dma_data_direction dir, struct dma_attrs *attrs); 87 88 extern void 89 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl, 90 int nelems, enum dma_data_direction dir, 91 struct dma_attrs *attrs); 92 93 extern void 94 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr, 95 size_t size, enum dma_data_direction dir); 96 97 extern void 98 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg, 99 int nelems, enum dma_data_direction dir); 100 101 extern void 102 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr, 103 size_t size, enum dma_data_direction dir); 104 105 extern void 106 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg, 107 int nelems, enum dma_data_direction dir); 108 109 extern int 110 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr); 111 112 extern int 113 swiotlb_dma_supported(struct device *hwdev, u64 mask); 114 115 #ifdef CONFIG_SWIOTLB 116 extern void __init swiotlb_free(void); 117 #else 118 static inline void swiotlb_free(void) { } 119 #endif 120 121 extern void swiotlb_print_info(void); 122 extern int is_swiotlb_buffer(phys_addr_t paddr); 123 124 #endif /* __LINUX_SWIOTLB_H */ 125