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 /*
  19  * log of the size of each IO TLB slab.  The number of slabs is command line
  20  * controllable.
  21  */
  22 #define IO_TLB_SHIFT 11
  23
  24 extern void
  25 swiotlb_init(void);
  26
  27 extern void *swiotlb_alloc_boot(size_t bytes, unsigned long nslabs);
  28 extern void *swiotlb_alloc(unsigned order, unsigned long nslabs);
  29
  30 extern dma_addr_t swiotlb_phys_to_bus(struct device *hwdev,
  31                                       phys_addr_t address);
  32 extern phys_addr_t swiotlb_bus_to_phys(dma_addr_t address);
  33
  34 extern int swiotlb_arch_range_needs_mapping(void *ptr, size_t size);
  35
  36 extern void
  37 *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
  38                         dma_addr_t *dma_handle, gfp_t flags);
  39
  40 extern void
  41 swiotlb_free_coherent(struct device *hwdev, size_t size,
  42                       void *vaddr, dma_addr_t dma_handle);
  43
  44 extern dma_addr_t
  45 swiotlb_map_single(struct device *hwdev, void *ptr, size_t size, int dir);
  46
  47 extern void
  48 swiotlb_unmap_single(struct device *hwdev, dma_addr_t dev_addr,
  49                      size_t size, int dir);
  50
  51 extern dma_addr_t
  52 swiotlb_map_single_attrs(struct device *hwdev, void *ptr, size_t size,
  53                          int dir, struct dma_attrs *attrs);
  54
  55 extern void
  56 swiotlb_unmap_single_attrs(struct device *hwdev, dma_addr_t dev_addr,
  57                            size_t size, int dir, struct dma_attrs *attrs);
  58
  59 extern int
  60 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  61                int direction);
  62
  63 extern void
  64 swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  65                  int direction);
  66
  67 extern int
  68 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
  69                      int dir, struct dma_attrs *attrs);
  70
  71 extern void
  72 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
  73                        int nelems, int dir, struct dma_attrs *attrs);
  74
  75 extern void
  76 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
  77                             size_t size, int dir);
  78
  79 extern void
  80 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
  81                         int nelems, int dir);
  82
  83 extern void
  84 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
  85                                size_t size, int dir);
  86
  87 extern void
  88 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
  89                            int nelems, int dir);
  90
  91 extern void
  92 swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
  93                                   unsigned long offset, size_t size, int dir);
  94
  95 extern void
  96 swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
  97                                      unsigned long offset, size_t size,
  98                                      int dir);
  99
 100 extern int
 101 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
 102
 103 extern int
 104 swiotlb_dma_supported(struct device *hwdev, u64 mask);
 105
 106 #endif /* __LINUX_SWIOTLB_H */