1 #ifndef __LINUX_SWIOTLB_H
2 #define __LINUX_SWIOTLB_H
4 #include <linux/dma-direction.h>
5 #include <linux/init.h>
6 #include <linux/types.h>
12 extern int swiotlb_force;
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.
19 #define IO_TLB_SEGSIZE 128
22 * log of the size of each IO TLB slab. The number of slabs is command line
25 #define IO_TLB_SHIFT 11
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);
34 * Enumeration for sync targets
36 enum dma_sync_target {
41 /* define the last possible byte of physical address space as a mapping error */
42 #define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
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,
50 extern void swiotlb_tbl_unmap_single(struct device *hwdev,
52 size_t size, enum dma_data_direction dir,
55 extern void swiotlb_tbl_sync_single(struct device *hwdev,
57 size_t size, enum dma_data_direction dir,
58 enum dma_sync_target target);
60 /* Accessory functions. */
62 *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
63 dma_addr_t *dma_handle, gfp_t flags);
66 swiotlb_free_coherent(struct device *hwdev, size_t size,
67 void *vaddr, dma_addr_t dma_handle);
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,
73 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
74 size_t size, enum dma_data_direction dir,
78 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
79 enum dma_data_direction dir,
83 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
84 int nelems, enum dma_data_direction dir,
88 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
89 size_t size, enum dma_data_direction dir);
92 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
93 int nelems, enum dma_data_direction dir);
96 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
97 size_t size, enum dma_data_direction dir);
100 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
101 int nelems, enum dma_data_direction dir);
104 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
107 swiotlb_dma_supported(struct device *hwdev, u64 mask);
109 #ifdef CONFIG_SWIOTLB
110 extern void __init swiotlb_free(void);
112 static inline void swiotlb_free(void) { }
115 extern void swiotlb_print_info(void);
116 extern int is_swiotlb_buffer(phys_addr_t paddr);
118 #endif /* __LINUX_SWIOTLB_H */