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 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 int swiotlb_late_init_with_default_size(size_t default_size); 39 extern void __init swiotlb_update_mem_attributes(void); 40 41 /* 42 * Enumeration for sync targets 43 */ 44 enum dma_sync_target { 45 SYNC_FOR_CPU = 0, 46 SYNC_FOR_DEVICE = 1, 47 }; 48 49 phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys, 50 size_t mapping_size, size_t alloc_size, 51 enum dma_data_direction dir, unsigned long attrs); 52 53 extern void swiotlb_tbl_unmap_single(struct device *hwdev, 54 phys_addr_t tlb_addr, 55 size_t mapping_size, 56 size_t alloc_size, 57 enum dma_data_direction dir, 58 unsigned long attrs); 59 60 extern void swiotlb_tbl_sync_single(struct device *hwdev, 61 phys_addr_t tlb_addr, 62 size_t size, enum dma_data_direction dir, 63 enum dma_sync_target target); 64 65 dma_addr_t swiotlb_map(struct device *dev, phys_addr_t phys, 66 size_t size, enum dma_data_direction dir, unsigned long attrs); 67 68 #ifdef CONFIG_SWIOTLB 69 extern enum swiotlb_force swiotlb_force; 70 extern phys_addr_t io_tlb_start, io_tlb_end; 71 72 static inline bool is_swiotlb_buffer(phys_addr_t paddr) 73 { 74 return paddr >= io_tlb_start && paddr < io_tlb_end; 75 } 76 77 void __init swiotlb_exit(void); 78 unsigned int swiotlb_max_segment(void); 79 size_t swiotlb_max_mapping_size(struct device *dev); 80 bool is_swiotlb_active(void); 81 #else 82 #define swiotlb_force SWIOTLB_NO_FORCE 83 static inline bool is_swiotlb_buffer(phys_addr_t paddr) 84 { 85 return false; 86 } 87 static inline void swiotlb_exit(void) 88 { 89 } 90 static inline unsigned int swiotlb_max_segment(void) 91 { 92 return 0; 93 } 94 static inline size_t swiotlb_max_mapping_size(struct device *dev) 95 { 96 return SIZE_MAX; 97 } 98 99 static inline bool is_swiotlb_active(void) 100 { 101 return false; 102 } 103 #endif /* CONFIG_SWIOTLB */ 104 105 extern void swiotlb_print_info(void); 106 extern void swiotlb_set_max_segment(unsigned int); 107 108 #endif /* __LINUX_SWIOTLB_H */ 109