include/linux/swiotlb.h

   1 #ifndef __LINUX_SWIOTLB_H
   2 #define __LINUX_SWIOTLB_H
   3
   4 #include <linux/dma-direction.h>
   5 #include <linux/init.h>
   6 #include <linux/types.h>
   7
   8 struct device;
   9 struct page;
  10 struct scatterlist;
  11
  12 extern int swiotlb_force;
  13
  14 /*
  15  * Maximum allowable number of contiguous slabs to map,
  16  * must be a power of 2.  What is the appropriate value ?
  17  * The complexity of {map,unmap}_single is linearly dependent on this value.
  18  */
  19 #define IO_TLB_SEGSIZE  128
  20
  21 /*
  22  * log of the size of each IO TLB slab.  The number of slabs is command line
  23  * controllable.
  24  */
  25 #define IO_TLB_SHIFT 11
  26
  27 extern void swiotlb_init(int verbose);
  28 int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
  29 extern unsigned long swiotlb_nr_tbl(void);
  30 unsigned long swiotlb_size_or_default(void);
  31 extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
  32
  33 /*
  34  * Enumeration for sync targets
  35  */
  36 enum dma_sync_target {
  37         SYNC_FOR_CPU = 0,
  38         SYNC_FOR_DEVICE = 1,
  39 };
  40
  41 /* define the last possible byte of physical address space as a mapping error */
  42 #define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
  43
  44 extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
  45                                           dma_addr_t tbl_dma_addr,
  46                                           phys_addr_t phys, size_t size,
  47                                           enum dma_data_direction dir,
  48                                           unsigned long attrs);
  49
  50 extern void swiotlb_tbl_unmap_single(struct device *hwdev,
  51                                      phys_addr_t tlb_addr,
  52                                      size_t size, enum dma_data_direction dir,
  53                                      unsigned long attrs);
  54
  55 extern void swiotlb_tbl_sync_single(struct device *hwdev,
  56                                     phys_addr_t tlb_addr,
  57                                     size_t size, enum dma_data_direction dir,
  58                                     enum dma_sync_target target);
  59
  60 /* Accessory functions. */
  61 extern void
  62 *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
  63                         dma_addr_t *dma_handle, gfp_t flags);
  64
  65 extern void
  66 swiotlb_free_coherent(struct device *hwdev, size_t size,
  67                       void *vaddr, dma_addr_t dma_handle);
  68
  69 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
  70                                    unsigned long offset, size_t size,
  71                                    enum dma_data_direction dir,
  72                                    unsigned long attrs);
  73 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
  74                                size_t size, enum dma_data_direction dir,
  75                                unsigned long attrs);
  76
  77 extern int
  78 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
  79                      enum dma_data_direction dir,
  80                      unsigned long attrs);
  81
  82 extern void
  83 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
  84                        int nelems, enum dma_data_direction dir,
  85                        unsigned long attrs);
  86
  87 extern void
  88 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
  89                             size_t size, enum dma_data_direction dir);
  90
  91 extern void
  92 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
  93                         int nelems, enum dma_data_direction dir);
  94
  95 extern void
  96 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
  97                                size_t size, enum dma_data_direction dir);
  98
  99 extern void
 100 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 101                            int nelems, enum dma_data_direction dir);
 102
 103 extern int
 104 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
 105
 106 extern int
 107 swiotlb_dma_supported(struct device *hwdev, u64 mask);
 108
 109 #ifdef CONFIG_SWIOTLB
 110 extern void __init swiotlb_free(void);
 111 #else
 112 static inline void swiotlb_free(void) { }
 113 #endif
 114
 115 extern void swiotlb_print_info(void);
 116 extern int is_swiotlb_buffer(phys_addr_t paddr);
 117
 118 #endif /* __LINUX_SWIOTLB_H */