include/linux/swiotlb.h

   1 #ifndef __LINUX_SWIOTLB_H
   2 #define __LINUX_SWIOTLB_H
   3
   4 #include <linux/types.h>
   5
   6 struct device;
   7 struct dma_attrs;
   8 struct scatterlist;
   9
  10 /*
  11  * Maximum allowable number of contiguous slabs to map,
  12  * must be a power of 2.  What is the appropriate value ?
  13  * The complexity of {map,unmap}_single is linearly dependent on this value.
  14  */
  15 #define IO_TLB_SEGSIZE  128
  16
  17 /*
  18  * log of the size of each IO TLB slab.  The number of slabs is command line
  19  * controllable.
  20  */
  21 #define IO_TLB_SHIFT 11
  22
  23 extern void
  24 swiotlb_init(void);
  25
  26 extern void
  27 *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
  28                         dma_addr_t *dma_handle, gfp_t flags);
  29
  30 extern void
  31 swiotlb_free_coherent(struct device *hwdev, size_t size,
  32                       void *vaddr, dma_addr_t dma_handle);
  33
  34 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
  35                                    unsigned long offset, size_t size,
  36                                    enum dma_data_direction dir,
  37                                    struct dma_attrs *attrs);
  38 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
  39                                size_t size, enum dma_data_direction dir,
  40                                struct dma_attrs *attrs);
  41
  42 extern int
  43 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  44                int direction);
  45
  46 extern void
  47 swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  48                  int direction);
  49
  50 extern int
  51 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
  52                      enum dma_data_direction dir, struct dma_attrs *attrs);
  53
  54 extern void
  55 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
  56                        int nelems, enum dma_data_direction dir,
  57                        struct dma_attrs *attrs);
  58
  59 extern void
  60 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
  61                             size_t size, enum dma_data_direction dir);
  62
  63 extern void
  64 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
  65                         int nelems, enum dma_data_direction dir);
  66
  67 extern void
  68 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
  69                                size_t size, enum dma_data_direction dir);
  70
  71 extern void
  72 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
  73                            int nelems, enum dma_data_direction dir);
  74
  75 extern void
  76 swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
  77                                   unsigned long offset, size_t size,
  78                                   enum dma_data_direction dir);
  79
  80 extern void
  81 swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
  82                                      unsigned long offset, size_t size,
  83                                      enum dma_data_direction dir);
  84
  85 extern int
  86 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
  87
  88 extern int
  89 swiotlb_dma_supported(struct device *hwdev, u64 mask);
  90
  91 #endif /* __LINUX_SWIOTLB_H */