1 #ifndef __LINUX_SWIOTLB_H
2 #define __LINUX_SWIOTLB_H
4 #include <linux/types.h>
10 extern int swiotlb_force;
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.
17 #define IO_TLB_SEGSIZE 128
20 * log of the size of each IO TLB slab. The number of slabs is command line
23 #define IO_TLB_SHIFT 11
25 extern void swiotlb_init(int verbose);
26 extern void swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
29 * Enumeration for sync targets
31 enum dma_sync_target {
35 extern void *swiotlb_tbl_map_single(struct device *hwdev, dma_addr_t tbl_dma_addr,
36 phys_addr_t phys, size_t size,
37 enum dma_data_direction dir);
39 extern void swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr,
40 size_t size, enum dma_data_direction dir);
42 extern void swiotlb_tbl_sync_single(struct device *hwdev, char *dma_addr,
43 size_t size, enum dma_data_direction dir,
44 enum dma_sync_target target);
46 /* Accessory functions. */
47 extern void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
48 enum dma_data_direction dir);
51 *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
52 dma_addr_t *dma_handle, gfp_t flags);
55 swiotlb_free_coherent(struct device *hwdev, size_t size,
56 void *vaddr, dma_addr_t dma_handle);
58 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
59 unsigned long offset, size_t size,
60 enum dma_data_direction dir,
61 struct dma_attrs *attrs);
62 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
63 size_t size, enum dma_data_direction dir,
64 struct dma_attrs *attrs);
67 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
68 enum dma_data_direction dir);
71 swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
72 enum dma_data_direction dir);
75 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
76 enum dma_data_direction dir, struct dma_attrs *attrs);
79 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
80 int nelems, enum dma_data_direction dir,
81 struct dma_attrs *attrs);
84 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
85 size_t size, enum dma_data_direction dir);
88 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
89 int nelems, enum dma_data_direction dir);
92 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
93 size_t size, enum dma_data_direction dir);
96 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
97 int nelems, enum dma_data_direction dir);
100 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
103 swiotlb_dma_supported(struct device *hwdev, u64 mask);
105 #ifdef CONFIG_SWIOTLB
106 extern void __init swiotlb_free(void);
108 static inline void swiotlb_free(void) { }
111 extern void swiotlb_print_info(void);
112 #endif /* __LINUX_SWIOTLB_H */