include/linux/iommu-common.h

   1 #ifndef _LINUX_IOMMU_COMMON_H
   2 #define _LINUX_IOMMU_COMMON_H
   3
   4 #include <linux/spinlock_types.h>
   5 #include <linux/device.h>
   6 #include <asm/page.h>
   7
   8 #define IOMMU_POOL_HASHBITS     4
   9 #define IOMMU_NR_POOLS          (1 << IOMMU_POOL_HASHBITS)
  10
  11 struct iommu_pool {
  12         unsigned long   start;
  13         unsigned long   end;
  14         unsigned long   hint;
  15         spinlock_t      lock;
  16 };
  17
  18 struct iommu_table;
  19
  20 struct iommu_tbl_ops {
  21         unsigned long   (*cookie_to_index)(u64, void *);
  22         void            (*demap)(void *, unsigned long, unsigned long);
  23         void            (*reset)(struct iommu_table *);
  24 };
  25
  26 struct iommu_table {
  27         unsigned long           page_table_map_base;
  28         unsigned long           page_table_shift;
  29         unsigned long           nr_pools;
  30         const struct iommu_tbl_ops  *iommu_tbl_ops;
  31         unsigned long           poolsize;
  32         struct iommu_pool       arena_pool[IOMMU_NR_POOLS];
  33         u32                     flags;
  34 #define IOMMU_HAS_LARGE_POOL    0x00000001
  35         struct iommu_pool       large_pool;
  36         unsigned long           *map;
  37 };
  38
  39 extern void iommu_tbl_pool_init(struct iommu_table *iommu,
  40                                 unsigned long num_entries,
  41                                 u32 page_table_shift,
  42                                 const struct iommu_tbl_ops *iommu_tbl_ops,
  43                                 bool large_pool, u32 npools);
  44
  45 extern unsigned long iommu_tbl_range_alloc(struct device *dev,
  46                                            struct iommu_table *iommu,
  47                                            unsigned long npages,
  48                                            unsigned long *handle,
  49                                            unsigned int pool_hash);
  50
  51 extern void iommu_tbl_range_free(struct iommu_table *iommu,
  52                                  u64 dma_addr, unsigned long npages,
  53                                  bool do_demap, void *demap_arg);
  54
  55 #endif