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 unsigned long attrs); 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 unsigned long attrs); 54 55 extern void swiotlb_tbl_sync_single(struct device *hwdev, 56 phys_addr_t tlb_addr, 57 size_t size, enum dma_data_direction dir, 58 enum dma_sync_target target); 59 60 /* Accessory functions. */ 61 extern void 62 *swiotlb_alloc_coherent(struct device *hwdev, size_t size, 63 dma_addr_t *dma_handle, gfp_t flags); 64 65 extern void 66 swiotlb_free_coherent(struct device *hwdev, size_t size, 67 void *vaddr, dma_addr_t dma_handle); 68 69 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, 70 unsigned long offset, size_t size, 71 enum dma_data_direction dir, 72 unsigned long attrs); 73 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr, 74 size_t size, enum dma_data_direction dir, 75 unsigned long attrs); 76 77 extern int 78 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, 79 enum dma_data_direction dir, 80 unsigned long attrs); 81 82 extern void 83 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl, 84 int nelems, enum dma_data_direction dir, 85 unsigned long attrs); 86 87 extern void 88 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr, 89 size_t size, enum dma_data_direction dir); 90 91 extern void 92 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg, 93 int nelems, enum dma_data_direction dir); 94 95 extern void 96 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr, 97 size_t size, enum dma_data_direction dir); 98 99 extern void 100 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg, 101 int nelems, enum dma_data_direction dir); 102 103 extern int 104 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr); 105 106 extern int 107 swiotlb_dma_supported(struct device *hwdev, u64 mask); 108 109 #ifdef CONFIG_SWIOTLB 110 extern void __init swiotlb_free(void); 111 #else 112 static inline void swiotlb_free(void) { } 113 #endif 114 115 extern void swiotlb_print_info(void); 116 extern int is_swiotlb_buffer(phys_addr_t paddr); 117 118 #endif /* __LINUX_SWIOTLB_H */ 119