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 27 extern void 28 *swiotlb_alloc_coherent(struct device *hwdev, size_t size, 29 dma_addr_t *dma_handle, gfp_t flags); 30 31 extern void 32 swiotlb_free_coherent(struct device *hwdev, size_t size, 33 void *vaddr, dma_addr_t dma_handle); 34 35 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, 36 unsigned long offset, size_t size, 37 enum dma_data_direction dir, 38 struct dma_attrs *attrs); 39 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr, 40 size_t size, enum dma_data_direction dir, 41 struct dma_attrs *attrs); 42 43 extern int 44 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, 45 int direction); 46 47 extern void 48 swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents, 49 int direction); 50 51 extern int 52 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, 53 enum dma_data_direction dir, struct dma_attrs *attrs); 54 55 extern void 56 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl, 57 int nelems, enum dma_data_direction dir, 58 struct dma_attrs *attrs); 59 60 extern void 61 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr, 62 size_t size, enum dma_data_direction dir); 63 64 extern void 65 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg, 66 int nelems, enum dma_data_direction dir); 67 68 extern void 69 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr, 70 size_t size, enum dma_data_direction dir); 71 72 extern void 73 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg, 74 int nelems, enum dma_data_direction dir); 75 76 extern void 77 swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr, 78 unsigned long offset, size_t size, 79 enum dma_data_direction dir); 80 81 extern void 82 swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr, 83 unsigned long offset, size_t size, 84 enum dma_data_direction dir); 85 86 extern int 87 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr); 88 89 extern int 90 swiotlb_dma_supported(struct device *hwdev, u64 mask); 91 92 #ifdef CONFIG_SWIOTLB 93 extern void __init swiotlb_free(void); 94 #else 95 static inline void swiotlb_free(void) { } 96 #endif 97 98 extern void swiotlb_print_info(void); 99 #endif /* __LINUX_SWIOTLB_H */ 100