/include/linux/iova.h

https://gitlab.com/simplified-mandatory-access-control-kernel/ossecus-simplified-mandatory-access-control-kernel · C Header · 51 lines · 32 code · 7 blank · 12 comment · 0 complexity · 3bd346b010bf151c8a75e37d8eb78348 MD5 · raw file 

    

  1. /*
    2. 

  2.  * Copyright (c) 2006, Intel Corporation.
    3. 

  3.  *
    4. 

  4.  * This file is released under the GPLv2.
    5. 

  5.  *
    6. 

  6.  * Copyright (C) 2006-2008 Intel Corporation
    7. 

  7.  * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
    8. 

  8.  *
    9. 

  9.  */
    10. 

  10. 

  11. #ifndef _IOVA_H_
    12. 

  12. #define _IOVA_H_
    13. 

  13. 

  14. #include <linux/types.h>
    15. 

  15. #include <linux/kernel.h>
    16. 

  16. #include <linux/rbtree.h>
    17. 

  17. #include <linux/dma-mapping.h>
    18. 

  18. 

  19. /* IO virtual address start page frame number */
    20. 

  20. #define IOVA_START_PFN		(1)
    21. 

  21. 

  22. /* iova structure */
    23. 

  23. struct iova {
    24. 

  24. 	struct rb_node	node;
    25. 

  25. 	unsigned long	pfn_hi; /* IOMMU dish out addr hi */
    26. 

  26. 	unsigned long	pfn_lo; /* IOMMU dish out addr lo */
    27. 

  27. };
    28. 

  28. 

  29. /* holds all the iova translations for a domain */
    30. 

  30. struct iova_domain {
    31. 

  31. 	spinlock_t	iova_rbtree_lock; /* Lock to protect update of rbtree */
    32. 

  32. 	struct rb_root	rbroot;		/* iova domain rbtree root */
    33. 

  33. 	struct rb_node	*cached32_node; /* Save last alloced node */
    34. 

  34. 	unsigned long	dma_32bit_pfn;
    35. 

  35. };
    36. 

  36. 

  37. struct iova *alloc_iova_mem(void);
    38. 

  38. void free_iova_mem(struct iova *iova);
    39. 

  39. void free_iova(struct iova_domain *iovad, unsigned long pfn);
    40. 

  40. void __free_iova(struct iova_domain *iovad, struct iova *iova);
    41. 

  41. struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
    42. 

  42. 	unsigned long limit_pfn,
    43. 

  43. 	bool size_aligned);
    44. 

  44. struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
    45. 

  45. 	unsigned long pfn_hi);
    46. 

  46. void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
    47. 

  47. void init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit);
    48. 

  48. struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
    49. 

  49. void put_iova_domain(struct iova_domain *iovad);
    50. 

  50. 

  51. #endif
    52.