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 enum swiotlb_force {
  13         SWIOTLB_NORMAL,         /* Default - depending on HW DMA mask etc. */
  14         SWIOTLB_FORCE,          /* swiotlb=force */
  15         SWIOTLB_NO_FORCE,       /* swiotlb=noforce */
  16 };
  17
  18 extern enum swiotlb_force swiotlb_force;
  19
  20 /*
  21  * Maximum allowable number of contiguous slabs to map,
  22  * must be a power of 2.  What is the appropriate value ?
  23  * The complexity of {map,unmap}_single is linearly dependent on this value.
  24  */
  25 #define IO_TLB_SEGSIZE  128
  26
  27 /*
  28  * log of the size of each IO TLB slab.  The number of slabs is command line
  29  * controllable.
  30  */
  31 #define IO_TLB_SHIFT 11
  32
  33 extern void swiotlb_init(int verbose);
  34 int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
  35 extern unsigned long swiotlb_nr_tbl(void);
  36 unsigned long swiotlb_size_or_default(void);
  37 extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
  38 extern void __init swiotlb_update_mem_attributes(void);
  39
  40 /*
  41  * Enumeration for sync targets
  42  */
  43 enum dma_sync_target {
  44         SYNC_FOR_CPU = 0,
  45         SYNC_FOR_DEVICE = 1,
  46 };
  47
  48 /* define the last possible byte of physical address space as a mapping error */
  49 #define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
  50
  51 extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
  52                                           dma_addr_t tbl_dma_addr,
  53                                           phys_addr_t phys, size_t size,
  54                                           enum dma_data_direction dir,
  55                                           unsigned long attrs);
  56
  57 extern void swiotlb_tbl_unmap_single(struct device *hwdev,
  58                                      phys_addr_t tlb_addr,
  59                                      size_t size, enum dma_data_direction dir,
  60                                      unsigned long attrs);
  61
  62 extern void swiotlb_tbl_sync_single(struct device *hwdev,
  63                                     phys_addr_t tlb_addr,
  64                                     size_t size, enum dma_data_direction dir,
  65                                     enum dma_sync_target target);
  66
  67 /* Accessory functions. */
  68 extern void
  69 *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
  70                         dma_addr_t *dma_handle, gfp_t flags);
  71
  72 extern void
  73 swiotlb_free_coherent(struct device *hwdev, size_t size,
  74                       void *vaddr, dma_addr_t dma_handle);
  75
  76 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
  77                                    unsigned long offset, size_t size,
  78                                    enum dma_data_direction dir,
  79                                    unsigned long attrs);
  80 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
  81                                size_t size, enum dma_data_direction dir,
  82                                unsigned long attrs);
  83
  84 extern int
  85 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
  86                      enum dma_data_direction dir,
  87                      unsigned long attrs);
  88
  89 extern void
  90 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
  91                        int nelems, enum dma_data_direction dir,
  92                        unsigned long attrs);
  93
  94 extern void
  95 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
  96                             size_t size, enum dma_data_direction dir);
  97
  98 extern void
  99 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 100                         int nelems, enum dma_data_direction dir);
 101
 102 extern void
 103 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
 104                                size_t size, enum dma_data_direction dir);
 105
 106 extern void
 107 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 108                            int nelems, enum dma_data_direction dir);
 109
 110 extern int
 111 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
 112
 113 extern int
 114 swiotlb_dma_supported(struct device *hwdev, u64 mask);
 115
 116 #ifdef CONFIG_SWIOTLB
 117 extern void __init swiotlb_free(void);
 118 unsigned int swiotlb_max_segment(void);
 119 #else
 120 static inline void swiotlb_free(void) { }
 121 static inline unsigned int swiotlb_max_segment(void) { return 0; }
 122 #endif
 123
 124 extern void swiotlb_print_info(void);
 125 extern int is_swiotlb_buffer(phys_addr_t paddr);
 126 extern void swiotlb_set_max_segment(unsigned int);
 127
 128 #endif /* __LINUX_SWIOTLB_H */