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