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 #include <linux/limits.h> 9 10 struct device; 11 struct page; 12 struct scatterlist; 13 14 enum swiotlb_force { 15 SWIOTLB_NORMAL, /* Default - depending on HW DMA mask etc. */ 16 SWIOTLB_FORCE, /* swiotlb=force */ 17 SWIOTLB_NO_FORCE, /* swiotlb=noforce */ 18 }; 19 20 /* 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. 24 */ 25 #define IO_TLB_SEGSIZE 128 26 27 /* 28 * log of the size of each IO TLB slab. The number of slabs is command line 29 * controllable. 30 */ 31 #define IO_TLB_SHIFT 11 32 #define IO_TLB_SIZE (1 << IO_TLB_SHIFT) 33 34 /* default to 64MB */ 35 #define IO_TLB_DEFAULT_SIZE (64UL<<20) 36 37 extern void swiotlb_init(int verbose); 38 int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose); 39 extern unsigned long swiotlb_nr_tbl(void); 40 unsigned long swiotlb_size_or_default(void); 41 extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs); 42 extern int swiotlb_late_init_with_default_size(size_t default_size); 43 extern void __init swiotlb_update_mem_attributes(void); 44 45 /* 46 * Enumeration for sync targets 47 */ 48 enum dma_sync_target { 49 SYNC_FOR_CPU = 0, 50 SYNC_FOR_DEVICE = 1, 51 }; 52 53 phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys, 54 size_t mapping_size, size_t alloc_size, 55 enum dma_data_direction dir, unsigned long attrs); 56 57 extern void swiotlb_tbl_unmap_single(struct device *hwdev, 58 phys_addr_t tlb_addr, 59 size_t mapping_size, 60 size_t alloc_size, 61 enum dma_data_direction dir, 62 unsigned long attrs); 63 64 extern void swiotlb_tbl_sync_single(struct device *hwdev, 65 phys_addr_t tlb_addr, 66 size_t size, enum dma_data_direction dir, 67 enum dma_sync_target target); 68 69 dma_addr_t swiotlb_map(struct device *dev, phys_addr_t phys, 70 size_t size, enum dma_data_direction dir, unsigned long attrs); 71 72 #ifdef CONFIG_SWIOTLB 73 extern enum swiotlb_force swiotlb_force; 74 extern phys_addr_t io_tlb_start, io_tlb_end; 75 76 static inline bool is_swiotlb_buffer(phys_addr_t paddr) 77 { 78 return paddr >= io_tlb_start && paddr < io_tlb_end; 79 } 80 81 void __init swiotlb_exit(void); 82 unsigned int swiotlb_max_segment(void); 83 size_t swiotlb_max_mapping_size(struct device *dev); 84 bool is_swiotlb_active(void); 85 void __init swiotlb_adjust_size(unsigned long new_size); 86 #else 87 #define swiotlb_force SWIOTLB_NO_FORCE 88 static inline bool is_swiotlb_buffer(phys_addr_t paddr) 89 { 90 return false; 91 } 92 static inline void swiotlb_exit(void) 93 { 94 } 95 static inline unsigned int swiotlb_max_segment(void) 96 { 97 return 0; 98 } 99 static inline size_t swiotlb_max_mapping_size(struct device *dev) 100 { 101 return SIZE_MAX; 102 } 103 104 static inline bool is_swiotlb_active(void) 105 { 106 return false; 107 } 108 109 static inline void swiotlb_adjust_size(unsigned long new_size) 110 { 111 } 112 #endif /* CONFIG_SWIOTLB */ 113 114 extern void swiotlb_print_info(void); 115 extern void swiotlb_set_max_segment(unsigned int); 116 117 #endif /* __LINUX_SWIOTLB_H */ 118