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 page; 10 struct scatterlist; 11 12 extern int swiotlb_force; 13 14 /* 15 * Maximum allowable number of contiguous slabs to map, 16 * must be a power of 2. What is the appropriate value ? 17 * The complexity of {map,unmap}_single is linearly dependent on this value. 18 */ 19 #define IO_TLB_SEGSIZE 128 20 21 /* 22 * log of the size of each IO TLB slab. The number of slabs is command line 23 * controllable. 24 */ 25 #define IO_TLB_SHIFT 11 26 27 extern void swiotlb_init(int verbose); 28 int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose); 29 extern unsigned long swiotlb_nr_tbl(void); 30 unsigned long swiotlb_size_or_default(void); 31 extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs); 32 33 /* 34 * Enumeration for sync targets 35 */ 36 enum dma_sync_target { 37 SYNC_FOR_CPU = 0, 38 SYNC_FOR_DEVICE = 1, 39 }; 40 41 /* define the last possible byte of physical address space as a mapping error */ 42 #define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0) 43 44 extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, 45 dma_addr_t tbl_dma_addr, 46 phys_addr_t phys, size_t size, 47 enum dma_data_direction dir); 48 49 extern void swiotlb_tbl_unmap_single(struct device *hwdev, 50 phys_addr_t tlb_addr, 51 size_t size, enum dma_data_direction dir); 52 53 extern void swiotlb_tbl_sync_single(struct device *hwdev, 54 phys_addr_t tlb_addr, 55 size_t size, enum dma_data_direction dir, 56 enum dma_sync_target target); 57 58 /* Accessory functions. */ 59 extern void 60 *swiotlb_alloc_coherent(struct device *hwdev, size_t size, 61 dma_addr_t *dma_handle, gfp_t flags); 62 63 extern void 64 swiotlb_free_coherent(struct device *hwdev, size_t size, 65 void *vaddr, dma_addr_t dma_handle); 66 67 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, 68 unsigned long offset, size_t size, 69 enum dma_data_direction dir, 70 unsigned long attrs); 71 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr, 72 size_t size, enum dma_data_direction dir, 73 unsigned long attrs); 74 75 extern int 76 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, 77 enum dma_data_direction dir); 78 79 extern void 80 swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents, 81 enum dma_data_direction dir); 82 83 extern int 84 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, 85 enum dma_data_direction dir, 86 unsigned long 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 unsigned long 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