pfn_t.h 3.2 KB

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  1. /* SPDX-License-Identifier: GPL-2.0 */
  2. #ifndef _LINUX_PFN_T_H_
  3. #define _LINUX_PFN_T_H_
  4. #include <linux/mm.h>
  5. /*
  6. * PFN_FLAGS_MASK - mask of all the possible valid pfn_t flags
  7. * PFN_SG_CHAIN - pfn is a pointer to the next scatterlist entry
  8. * PFN_SG_LAST - pfn references a page and is the last scatterlist entry
  9. * PFN_DEV - pfn is not covered by system memmap by default
  10. * PFN_MAP - pfn has a dynamic page mapping established by a device driver
  11. * PFN_SPECIAL - for CONFIG_FS_DAX_LIMITED builds to allow XIP, but not
  12. * get_user_pages
  13. */
  14. #define PFN_FLAGS_MASK (((u64) (~PAGE_MASK)) << (BITS_PER_LONG_LONG - PAGE_SHIFT))
  15. #define PFN_SG_CHAIN (1ULL << (BITS_PER_LONG_LONG - 1))
  16. #define PFN_SG_LAST (1ULL << (BITS_PER_LONG_LONG - 2))
  17. #define PFN_DEV (1ULL << (BITS_PER_LONG_LONG - 3))
  18. #define PFN_MAP (1ULL << (BITS_PER_LONG_LONG - 4))
  19. #define PFN_SPECIAL (1ULL << (BITS_PER_LONG_LONG - 5))
  20. #define PFN_FLAGS_TRACE \
  21. { PFN_SPECIAL, "SPECIAL" }, \
  22. { PFN_SG_CHAIN, "SG_CHAIN" }, \
  23. { PFN_SG_LAST, "SG_LAST" }, \
  24. { PFN_DEV, "DEV" }, \
  25. { PFN_MAP, "MAP" }
  26. static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, u64 flags)
  27. {
  28. pfn_t pfn_t = { .val = pfn | (flags & PFN_FLAGS_MASK), };
  29. return pfn_t;
  30. }
  31. /* a default pfn to pfn_t conversion assumes that @pfn is pfn_valid() */
  32. static inline pfn_t pfn_to_pfn_t(unsigned long pfn)
  33. {
  34. return __pfn_to_pfn_t(pfn, 0);
  35. }
  36. static inline pfn_t phys_to_pfn_t(phys_addr_t addr, u64 flags)
  37. {
  38. return __pfn_to_pfn_t(addr >> PAGE_SHIFT, flags);
  39. }
  40. static inline bool pfn_t_has_page(pfn_t pfn)
  41. {
  42. return (pfn.val & PFN_MAP) == PFN_MAP || (pfn.val & PFN_DEV) == 0;
  43. }
  44. static inline unsigned long pfn_t_to_pfn(pfn_t pfn)
  45. {
  46. return pfn.val & ~PFN_FLAGS_MASK;
  47. }
  48. static inline struct page *pfn_t_to_page(pfn_t pfn)
  49. {
  50. if (pfn_t_has_page(pfn))
  51. return pfn_to_page(pfn_t_to_pfn(pfn));
  52. return NULL;
  53. }
  54. static inline phys_addr_t pfn_t_to_phys(pfn_t pfn)
  55. {
  56. return PFN_PHYS(pfn_t_to_pfn(pfn));
  57. }
  58. static inline pfn_t page_to_pfn_t(struct page *page)
  59. {
  60. return pfn_to_pfn_t(page_to_pfn(page));
  61. }
  62. static inline int pfn_t_valid(pfn_t pfn)
  63. {
  64. return pfn_valid(pfn_t_to_pfn(pfn));
  65. }
  66. #ifdef CONFIG_MMU
  67. static inline pte_t pfn_t_pte(pfn_t pfn, pgprot_t pgprot)
  68. {
  69. return pfn_pte(pfn_t_to_pfn(pfn), pgprot);
  70. }
  71. #endif
  72. #ifdef CONFIG_TRANSPARENT_HUGEPAGE
  73. static inline pmd_t pfn_t_pmd(pfn_t pfn, pgprot_t pgprot)
  74. {
  75. return pfn_pmd(pfn_t_to_pfn(pfn), pgprot);
  76. }
  77. #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
  78. static inline pud_t pfn_t_pud(pfn_t pfn, pgprot_t pgprot)
  79. {
  80. return pfn_pud(pfn_t_to_pfn(pfn), pgprot);
  81. }
  82. #endif
  83. #endif
  84. #ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
  85. static inline bool pfn_t_devmap(pfn_t pfn)
  86. {
  87. const u64 flags = PFN_DEV|PFN_MAP;
  88. return (pfn.val & flags) == flags;
  89. }
  90. #else
  91. static inline bool pfn_t_devmap(pfn_t pfn)
  92. {
  93. return false;
  94. }
  95. pte_t pte_mkdevmap(pte_t pte);
  96. pmd_t pmd_mkdevmap(pmd_t pmd);
  97. #if defined(CONFIG_TRANSPARENT_HUGEPAGE) && \
  98. defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)
  99. pud_t pud_mkdevmap(pud_t pud);
  100. #endif
  101. #endif /* CONFIG_ARCH_HAS_PTE_DEVMAP */
  102. #ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
  103. static inline bool pfn_t_special(pfn_t pfn)
  104. {
  105. return (pfn.val & PFN_SPECIAL) == PFN_SPECIAL;
  106. }
  107. #else
  108. static inline bool pfn_t_special(pfn_t pfn)
  109. {
  110. return false;
  111. }
  112. #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
  113. #endif /* _LINUX_PFN_T_H_ */