1 #ifndef _LINUX_PFN_T_H_ 2 #define _LINUX_PFN_T_H_ 3 #include <linux/mm.h> 4 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 */ 12 #define PFN_FLAGS_MASK (((u64) ~PAGE_MASK) << (BITS_PER_LONG_LONG - PAGE_SHIFT)) 13 #define PFN_SG_CHAIN (1ULL << (BITS_PER_LONG_LONG - 1)) 14 #define PFN_SG_LAST (1ULL << (BITS_PER_LONG_LONG - 2)) 15 #define PFN_DEV (1ULL << (BITS_PER_LONG_LONG - 3)) 16 #define PFN_MAP (1ULL << (BITS_PER_LONG_LONG - 4)) 17 18 #define PFN_FLAGS_TRACE \ 19 { PFN_SG_CHAIN, "SG_CHAIN" }, \ 20 { PFN_SG_LAST, "SG_LAST" }, \ 21 { PFN_DEV, "DEV" }, \ 22 { PFN_MAP, "MAP" } 23 24 static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, u64 flags) 25 { 26 pfn_t pfn_t = { .val = pfn | (flags & PFN_FLAGS_MASK), }; 27 28 return pfn_t; 29 } 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 37 static inline pfn_t phys_to_pfn_t(phys_addr_t addr, u64 flags) 38 { 39 return __pfn_to_pfn_t(addr >> PAGE_SHIFT, flags); 40 } 41 42 static inline bool pfn_t_has_page(pfn_t pfn) 43 { 44 return (pfn.val & PFN_MAP) == PFN_MAP || (pfn.val & PFN_DEV) == 0; 45 } 46 47 static inline unsigned long pfn_t_to_pfn(pfn_t pfn) 48 { 49 return pfn.val & ~PFN_FLAGS_MASK; 50 } 51 52 static inline struct page *pfn_t_to_page(pfn_t pfn) 53 { 54 if (pfn_t_has_page(pfn)) 55 return pfn_to_page(pfn_t_to_pfn(pfn)); 56 return NULL; 57 } 58 59 static inline phys_addr_t pfn_t_to_phys(pfn_t pfn) 60 { 61 return PFN_PHYS(pfn_t_to_pfn(pfn)); 62 } 63 64 static inline void *pfn_t_to_virt(pfn_t pfn) 65 { 66 if (pfn_t_has_page(pfn)) 67 return __va(pfn_t_to_phys(pfn)); 68 return NULL; 69 } 70 71 static inline pfn_t page_to_pfn_t(struct page *page) 72 { 73 return pfn_to_pfn_t(page_to_pfn(page)); 74 } 75 76 static inline int pfn_t_valid(pfn_t pfn) 77 { 78 return pfn_valid(pfn_t_to_pfn(pfn)); 79 } 80 81 #ifdef CONFIG_MMU 82 static inline pte_t pfn_t_pte(pfn_t pfn, pgprot_t pgprot) 83 { 84 return pfn_pte(pfn_t_to_pfn(pfn), pgprot); 85 } 86 #endif 87 88 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 89 static inline pmd_t pfn_t_pmd(pfn_t pfn, pgprot_t pgprot) 90 { 91 return pfn_pmd(pfn_t_to_pfn(pfn), pgprot); 92 } 93 #endif 94 95 #ifdef __HAVE_ARCH_PTE_DEVMAP 96 static inline bool pfn_t_devmap(pfn_t pfn) 97 { 98 const u64 flags = PFN_DEV|PFN_MAP; 99 100 return (pfn.val & flags) == flags; 101 } 102 #else 103 static inline bool pfn_t_devmap(pfn_t pfn) 104 { 105 return false; 106 } 107 pte_t pte_mkdevmap(pte_t pte); 108 pmd_t pmd_mkdevmap(pmd_t pmd); 109 #endif 110 #endif /* _LINUX_PFN_T_H_ */ 111