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);
27 extern unsigned long swiotlb_nr_tbl(void);
28 extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
31 * Enumeration for sync targets
33 enum dma_sync_target {
38 /* define the last possible byte of physical address space as a mapping error */
39 #define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
41 extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
42 dma_addr_t tbl_dma_addr,
43 phys_addr_t phys, size_t size,
44 enum dma_data_direction dir);
46 extern void swiotlb_tbl_unmap_single(struct device *hwdev,
48 size_t size, enum dma_data_direction dir);
50 extern void swiotlb_tbl_sync_single(struct device *hwdev,
52 size_t size, enum dma_data_direction dir,
53 enum dma_sync_target target);
55 /* Accessory functions. */
57 *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
58 dma_addr_t *dma_handle, gfp_t flags);
61 swiotlb_free_coherent(struct device *hwdev, size_t size,
62 void *vaddr, dma_addr_t dma_handle);
64 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
65 unsigned long offset, size_t size,
66 enum dma_data_direction dir,
67 struct dma_attrs *attrs);
68 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
69 size_t size, enum dma_data_direction dir,
70 struct dma_attrs *attrs);
73 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
74 enum dma_data_direction dir);
77 swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
78 enum dma_data_direction dir);
81 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
82 enum dma_data_direction dir, struct dma_attrs *attrs);
85 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
86 int nelems, enum dma_data_direction dir,
87 struct dma_attrs *attrs);
90 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
91 size_t size, enum dma_data_direction dir);
94 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
95 int nelems, enum dma_data_direction dir);
98 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
99 size_t size, enum dma_data_direction dir);
102 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
103 int nelems, enum dma_data_direction dir);
106 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
109 swiotlb_dma_supported(struct device *hwdev, u64 mask);
111 #ifdef CONFIG_SWIOTLB
112 extern void __init swiotlb_free(void);
114 static inline void swiotlb_free(void) { }
117 extern void swiotlb_print_info(void);
118 #endif /* __LINUX_SWIOTLB_H */