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TOMOYO Linux Cross Reference
Linux/include/linux/swiotlb.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef __LINUX_SWIOTLB_H
  3 #define __LINUX_SWIOTLB_H
  4 
  5 #include <linux/dma-direction.h>
  6 #include <linux/init.h>
  7 #include <linux/types.h>
  8 
  9 struct device;
 10 struct page;
 11 struct scatterlist;
 12 
 13 enum swiotlb_force {
 14         SWIOTLB_NORMAL,         /* Default - depending on HW DMA mask etc. */
 15         SWIOTLB_FORCE,          /* swiotlb=force */
 16         SWIOTLB_NO_FORCE,       /* swiotlb=noforce */
 17 };
 18 
 19 /*
 20  * Maximum allowable number of contiguous slabs to map,
 21  * must be a power of 2.  What is the appropriate value ?
 22  * The complexity of {map,unmap}_single is linearly dependent on this value.
 23  */
 24 #define IO_TLB_SEGSIZE  128
 25 
 26 /*
 27  * log of the size of each IO TLB slab.  The number of slabs is command line
 28  * controllable.
 29  */
 30 #define IO_TLB_SHIFT 11
 31 
 32 extern void swiotlb_init(int verbose);
 33 int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
 34 extern unsigned long swiotlb_nr_tbl(void);
 35 unsigned long swiotlb_size_or_default(void);
 36 extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
 37 extern void __init swiotlb_update_mem_attributes(void);
 38 
 39 /*
 40  * Enumeration for sync targets
 41  */
 42 enum dma_sync_target {
 43         SYNC_FOR_CPU = 0,
 44         SYNC_FOR_DEVICE = 1,
 45 };
 46 
 47 extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
 48                                           dma_addr_t tbl_dma_addr,
 49                                           phys_addr_t phys, size_t size,
 50                                           enum dma_data_direction dir,
 51                                           unsigned long attrs);
 52 
 53 extern void swiotlb_tbl_unmap_single(struct device *hwdev,
 54                                      phys_addr_t tlb_addr,
 55                                      size_t size, enum dma_data_direction dir,
 56                                      unsigned long attrs);
 57 
 58 extern void swiotlb_tbl_sync_single(struct device *hwdev,
 59                                     phys_addr_t tlb_addr,
 60                                     size_t size, enum dma_data_direction dir,
 61                                     enum dma_sync_target target);
 62 
 63 #ifdef CONFIG_SWIOTLB
 64 extern enum swiotlb_force swiotlb_force;
 65 extern phys_addr_t io_tlb_start, io_tlb_end;
 66 
 67 static inline bool is_swiotlb_buffer(phys_addr_t paddr)
 68 {
 69         return paddr >= io_tlb_start && paddr < io_tlb_end;
 70 }
 71 
 72 bool swiotlb_map(struct device *dev, phys_addr_t *phys, dma_addr_t *dma_addr,
 73                 size_t size, enum dma_data_direction dir, unsigned long attrs);
 74 void __init swiotlb_exit(void);
 75 unsigned int swiotlb_max_segment(void);
 76 size_t swiotlb_max_mapping_size(struct device *dev);
 77 bool is_swiotlb_active(void);
 78 #else
 79 #define swiotlb_force SWIOTLB_NO_FORCE
 80 static inline bool is_swiotlb_buffer(phys_addr_t paddr)
 81 {
 82         return false;
 83 }
 84 static inline bool swiotlb_map(struct device *dev, phys_addr_t *phys,
 85                 dma_addr_t *dma_addr, size_t size, enum dma_data_direction dir,
 86                 unsigned long attrs)
 87 {
 88         return false;
 89 }
 90 static inline void swiotlb_exit(void)
 91 {
 92 }
 93 static inline unsigned int swiotlb_max_segment(void)
 94 {
 95         return 0;
 96 }
 97 static inline size_t swiotlb_max_mapping_size(struct device *dev)
 98 {
 99         return SIZE_MAX;
100 }
101 
102 static inline bool is_swiotlb_active(void)
103 {
104         return false;
105 }
106 #endif /* CONFIG_SWIOTLB */
107 
108 extern void swiotlb_print_info(void);
109 extern void swiotlb_set_max_segment(unsigned int);
110 
111 #endif /* __LINUX_SWIOTLB_H */
112 

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