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129 lines
3.8 KiB
129 lines
3.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __LINUX_SWIOTLB_H |
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#define __LINUX_SWIOTLB_H |
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#include <linux/dma-direction.h> |
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#include <linux/init.h> |
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#include <linux/types.h> |
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struct device; |
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struct page; |
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struct scatterlist; |
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enum swiotlb_force { |
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SWIOTLB_NORMAL, /* Default - depending on HW DMA mask etc. */ |
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SWIOTLB_FORCE, /* swiotlb=force */ |
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SWIOTLB_NO_FORCE, /* swiotlb=noforce */ |
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}; |
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extern enum swiotlb_force swiotlb_force; |
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/* |
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* Maximum allowable number of contiguous slabs to map, |
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* must be a power of 2. What is the appropriate value ? |
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* The complexity of {map,unmap}_single is linearly dependent on this value. |
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*/ |
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#define IO_TLB_SEGSIZE 128 |
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/* |
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* log of the size of each IO TLB slab. The number of slabs is command line |
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* controllable. |
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*/ |
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#define IO_TLB_SHIFT 11 |
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extern void swiotlb_init(int verbose); |
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int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose); |
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extern unsigned long swiotlb_nr_tbl(void); |
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unsigned long swiotlb_size_or_default(void); |
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extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs); |
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extern void __init swiotlb_update_mem_attributes(void); |
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/* |
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* Enumeration for sync targets |
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*/ |
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enum dma_sync_target { |
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SYNC_FOR_CPU = 0, |
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SYNC_FOR_DEVICE = 1, |
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}; |
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/* define the last possible byte of physical address space as a mapping error */ |
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#define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0) |
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extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, |
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dma_addr_t tbl_dma_addr, |
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phys_addr_t phys, size_t size, |
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enum dma_data_direction dir, |
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unsigned long attrs); |
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extern void swiotlb_tbl_unmap_single(struct device *hwdev, |
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phys_addr_t tlb_addr, |
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size_t size, enum dma_data_direction dir, |
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unsigned long attrs); |
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extern void swiotlb_tbl_sync_single(struct device *hwdev, |
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phys_addr_t tlb_addr, |
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size_t size, enum dma_data_direction dir, |
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enum dma_sync_target target); |
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/* Accessory functions. */ |
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extern void |
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*swiotlb_alloc_coherent(struct device *hwdev, size_t size, |
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dma_addr_t *dma_handle, gfp_t flags); |
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extern void |
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swiotlb_free_coherent(struct device *hwdev, size_t size, |
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void *vaddr, dma_addr_t dma_handle); |
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extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, |
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unsigned long offset, size_t size, |
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enum dma_data_direction dir, |
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unsigned long attrs); |
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extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr, |
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size_t size, enum dma_data_direction dir, |
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unsigned long attrs); |
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extern int |
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swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, |
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enum dma_data_direction dir, |
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unsigned long attrs); |
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extern void |
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swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl, |
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int nelems, enum dma_data_direction dir, |
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unsigned long attrs); |
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extern void |
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swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr, |
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size_t size, enum dma_data_direction dir); |
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extern void |
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swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg, |
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int nelems, enum dma_data_direction dir); |
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extern void |
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swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr, |
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size_t size, enum dma_data_direction dir); |
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extern void |
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swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg, |
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int nelems, enum dma_data_direction dir); |
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extern int |
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swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr); |
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extern int |
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swiotlb_dma_supported(struct device *hwdev, u64 mask); |
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#ifdef CONFIG_SWIOTLB |
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extern void __init swiotlb_free(void); |
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unsigned int swiotlb_max_segment(void); |
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#else |
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static inline void swiotlb_free(void) { } |
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static inline unsigned int swiotlb_max_segment(void) { return 0; } |
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#endif |
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extern void swiotlb_print_info(void); |
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extern int is_swiotlb_buffer(phys_addr_t paddr); |
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extern void swiotlb_set_max_segment(unsigned int); |
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#endif /* __LINUX_SWIOTLB_H */
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