af51a9f184
Currently swiotlb is the only consumer for swiotlb_bounce. Since that is the case it doesn't make much sense to be exporting it so make it a static function only. In addition we can save a few more lines of code by making it so that it accepts the DMA address as a physical address instead of a virtual one. This is the last piece in essentially pushing all of the DMA address values to use physical addresses in swiotlb. In order to clarify things since we now have 2 physical addresses in use inside of swiotlb_bounce I am renaming phys to orig_addr, and dma_addr to tlb_addr. This way is should be clear that orig_addr is contained within io_orig_addr and tlb_addr is an address within the io_tlb_addr buffer. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
118 lines
3.4 KiB
C
118 lines
3.4 KiB
C
#ifndef __LINUX_SWIOTLB_H
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#define __LINUX_SWIOTLB_H
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#include <linux/types.h>
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struct device;
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struct dma_attrs;
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struct scatterlist;
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extern int 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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extern void 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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extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
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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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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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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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struct dma_attrs *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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struct dma_attrs *attrs);
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extern int
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swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
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enum dma_data_direction dir);
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extern void
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swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
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enum dma_data_direction dir);
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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, struct dma_attrs *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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struct dma_attrs *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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#else
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static inline void swiotlb_free(void) { }
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#endif
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extern void swiotlb_print_info(void);
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#endif /* __LINUX_SWIOTLB_H */
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