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>
13 SWIOTLB_NORMAL
, /* Default - depending on HW DMA mask etc. */
14 SWIOTLB_FORCE
, /* swiotlb=force */
15 SWIOTLB_NO_FORCE
, /* swiotlb=noforce */
18 extern enum swiotlb_force swiotlb_force
;
21 * Maximum allowable number of contiguous slabs to map,
22 * must be a power of 2. What is the appropriate value ?
23 * The complexity of {map,unmap}_single is linearly dependent on this value.
25 #define IO_TLB_SEGSIZE 128
28 * log of the size of each IO TLB slab. The number of slabs is command line
31 #define IO_TLB_SHIFT 11
33 extern void swiotlb_init(int verbose
);
34 int swiotlb_init_with_tbl(char *tlb
, unsigned long nslabs
, int verbose
);
35 extern unsigned long swiotlb_nr_tbl(void);
36 unsigned long swiotlb_size_or_default(void);
37 extern int swiotlb_late_init_with_tbl(char *tlb
, unsigned long nslabs
);
38 extern void __init
swiotlb_update_mem_attributes(void);
41 * Enumeration for sync targets
43 enum dma_sync_target
{
48 /* define the last possible byte of physical address space as a mapping error */
49 #define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
51 extern phys_addr_t
swiotlb_tbl_map_single(struct device
*hwdev
,
52 dma_addr_t tbl_dma_addr
,
53 phys_addr_t phys
, size_t size
,
54 enum dma_data_direction dir
,
57 extern void swiotlb_tbl_unmap_single(struct device
*hwdev
,
59 size_t size
, enum dma_data_direction dir
,
62 extern void swiotlb_tbl_sync_single(struct device
*hwdev
,
64 size_t size
, enum dma_data_direction dir
,
65 enum dma_sync_target target
);
67 /* Accessory functions. */
69 *swiotlb_alloc_coherent(struct device
*hwdev
, size_t size
,
70 dma_addr_t
*dma_handle
, gfp_t flags
);
73 swiotlb_free_coherent(struct device
*hwdev
, size_t size
,
74 void *vaddr
, dma_addr_t dma_handle
);
76 extern dma_addr_t
swiotlb_map_page(struct device
*dev
, struct page
*page
,
77 unsigned long offset
, size_t size
,
78 enum dma_data_direction dir
,
80 extern void swiotlb_unmap_page(struct device
*hwdev
, dma_addr_t dev_addr
,
81 size_t size
, enum dma_data_direction dir
,
85 swiotlb_map_sg_attrs(struct device
*hwdev
, struct scatterlist
*sgl
, int nelems
,
86 enum dma_data_direction dir
,
90 swiotlb_unmap_sg_attrs(struct device
*hwdev
, struct scatterlist
*sgl
,
91 int nelems
, enum dma_data_direction dir
,
95 swiotlb_sync_single_for_cpu(struct device
*hwdev
, dma_addr_t dev_addr
,
96 size_t size
, enum dma_data_direction dir
);
99 swiotlb_sync_sg_for_cpu(struct device
*hwdev
, struct scatterlist
*sg
,
100 int nelems
, enum dma_data_direction dir
);
103 swiotlb_sync_single_for_device(struct device
*hwdev
, dma_addr_t dev_addr
,
104 size_t size
, enum dma_data_direction dir
);
107 swiotlb_sync_sg_for_device(struct device
*hwdev
, struct scatterlist
*sg
,
108 int nelems
, enum dma_data_direction dir
);
111 swiotlb_dma_mapping_error(struct device
*hwdev
, dma_addr_t dma_addr
);
114 swiotlb_dma_supported(struct device
*hwdev
, u64 mask
);
116 #ifdef CONFIG_SWIOTLB
117 extern void __init
swiotlb_free(void);
118 unsigned int swiotlb_max_segment(void);
120 static inline void swiotlb_free(void) { }
121 static inline unsigned int swiotlb_max_segment(void) { return 0; }
124 extern void swiotlb_print_info(void);
125 extern int is_swiotlb_buffer(phys_addr_t paddr
);
126 extern void swiotlb_set_max_segment(unsigned int);
128 #endif /* __LINUX_SWIOTLB_H */