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Diffstat (limited to 'include/linux/swiotlb.h')
-rw-r--r-- | include/linux/swiotlb.h | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h new file mode 100644 index 000000000..5d2dbe7e0 --- /dev/null +++ b/include/linux/swiotlb.h @@ -0,0 +1,109 @@ +/* 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) + +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); +#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; +} +#endif /* CONFIG_SWIOTLB */ + +extern void swiotlb_print_info(void); +extern void swiotlb_set_max_segment(unsigned int); + +#endif /* __LINUX_SWIOTLB_H */ |