| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __LINUX_SWIOTLB_H |
| #define __LINUX_SWIOTLB_H |
| |
| #include <linux/dma-direction.h> |
| #include <linux/init.h> |
| #include <linux/types.h> |
| #include <linux/limits.h> |
| |
| struct device; |
| struct page; |
| struct scatterlist; |
| |
| enum swiotlb_force { |
| SWIOTLB_NORMAL, /* Default - depending on HW DMA mask etc. */ |
| SWIOTLB_FORCE, /* swiotlb=force */ |
| SWIOTLB_NO_FORCE, /* swiotlb=noforce */ |
| }; |
| |
| /* |
| * Maximum allowable number of contiguous slabs to map, |
| * must be a power of 2. What is the appropriate value ? |
| * The complexity of {map,unmap}_single is linearly dependent on this value. |
| */ |
| #define IO_TLB_SEGSIZE 128 |
| |
| /* |
| * log of the size of each IO TLB slab. The number of slabs is command line |
| * controllable. |
| */ |
| #define IO_TLB_SHIFT 11 |
| #define IO_TLB_SIZE (1 << IO_TLB_SHIFT) |
| |
| /* default to 64MB */ |
| #define IO_TLB_DEFAULT_SIZE (64UL<<20) |
| |
| extern void swiotlb_init(int verbose); |
| int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose); |
| extern unsigned long swiotlb_nr_tbl(void); |
| unsigned long swiotlb_size_or_default(void); |
| extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs); |
| extern int swiotlb_late_init_with_default_size(size_t default_size); |
| extern void __init swiotlb_update_mem_attributes(void); |
| |
| /* |
| * Enumeration for sync targets |
| */ |
| enum dma_sync_target { |
| SYNC_FOR_CPU = 0, |
| SYNC_FOR_DEVICE = 1, |
| }; |
| |
| phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys, |
| size_t mapping_size, size_t alloc_size, |
| enum dma_data_direction dir, unsigned long attrs); |
| |
| extern void swiotlb_tbl_unmap_single(struct device *hwdev, |
| phys_addr_t tlb_addr, |
| size_t mapping_size, |
| size_t alloc_size, |
| enum dma_data_direction dir, |
| unsigned long attrs); |
| |
| extern void swiotlb_tbl_sync_single(struct device *hwdev, |
| phys_addr_t tlb_addr, |
| size_t size, enum dma_data_direction dir, |
| enum dma_sync_target target); |
| |
| dma_addr_t swiotlb_map(struct device *dev, phys_addr_t phys, |
| size_t size, enum dma_data_direction dir, unsigned long attrs); |
| |
| #ifdef CONFIG_SWIOTLB |
| extern enum swiotlb_force swiotlb_force; |
| extern phys_addr_t io_tlb_start, io_tlb_end; |
| |
| static inline bool is_swiotlb_buffer(phys_addr_t paddr) |
| { |
| return paddr >= io_tlb_start && paddr < io_tlb_end; |
| } |
| |
| void __init swiotlb_exit(void); |
| unsigned int swiotlb_max_segment(void); |
| size_t swiotlb_max_mapping_size(struct device *dev); |
| bool is_swiotlb_active(void); |
| void __init swiotlb_adjust_size(unsigned long new_size); |
| #else |
| #define swiotlb_force SWIOTLB_NO_FORCE |
| static inline bool is_swiotlb_buffer(phys_addr_t paddr) |
| { |
| return false; |
| } |
| static inline void swiotlb_exit(void) |
| { |
| } |
| static inline unsigned int swiotlb_max_segment(void) |
| { |
| return 0; |
| } |
| static inline size_t swiotlb_max_mapping_size(struct device *dev) |
| { |
| return SIZE_MAX; |
| } |
| |
| static inline bool is_swiotlb_active(void) |
| { |
| return false; |
| } |
| |
| static inline void swiotlb_adjust_size(unsigned long new_size) |
| { |
| } |
| #endif /* CONFIG_SWIOTLB */ |
| |
| extern void swiotlb_print_info(void); |
| extern void swiotlb_set_max_segment(unsigned int); |
| |
| #endif /* __LINUX_SWIOTLB_H */ |