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 static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, u64 flags) 19 { 20 pfn_t pfn_t = { .val = pfn | (flags & PFN_FLAGS_MASK), }; 21 22 return pfn_t; 23 } 24 25 /* a default pfn to pfn_t conversion assumes that @pfn is pfn_valid() */ 26 static inline pfn_t pfn_to_pfn_t(unsigned long pfn) 27 { 28 return __pfn_to_pfn_t(pfn, 0); 29 } 30 31 static inline pfn_t phys_to_pfn_t(phys_addr_t addr, u64 flags) 32 { 33 return __pfn_to_pfn_t(addr >> PAGE_SHIFT, flags); 34 } 35 36 static inline bool pfn_t_has_page(pfn_t pfn) 37 { 38 return (pfn.val & PFN_MAP) == PFN_MAP || (pfn.val & PFN_DEV) == 0; 39 } 40 41 static inline unsigned long pfn_t_to_pfn(pfn_t pfn) 42 { 43 return pfn.val & ~PFN_FLAGS_MASK; 44 } 45 46 static inline struct page *pfn_t_to_page(pfn_t pfn) 47 { 48 if (pfn_t_has_page(pfn)) 49 return pfn_to_page(pfn_t_to_pfn(pfn)); 50 return NULL; 51 } 52 53 static inline phys_addr_t pfn_t_to_phys(pfn_t pfn) 54 { 55 return PFN_PHYS(pfn_t_to_pfn(pfn)); 56 } 57 58 static inline void *pfn_t_to_virt(pfn_t pfn) 59 { 60 if (pfn_t_has_page(pfn)) 61 return __va(pfn_t_to_phys(pfn)); 62 return NULL; 63 } 64 65 static inline pfn_t page_to_pfn_t(struct page *page) 66 { 67 return pfn_to_pfn_t(page_to_pfn(page)); 68 } 69 70 static inline int pfn_t_valid(pfn_t pfn) 71 { 72 return pfn_valid(pfn_t_to_pfn(pfn)); 73 } 74 75 #ifdef CONFIG_MMU 76 static inline pte_t pfn_t_pte(pfn_t pfn, pgprot_t pgprot) 77 { 78 return pfn_pte(pfn_t_to_pfn(pfn), pgprot); 79 } 80 #endif 81 82 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 83 static inline pmd_t pfn_t_pmd(pfn_t pfn, pgprot_t pgprot) 84 { 85 return pfn_pmd(pfn_t_to_pfn(pfn), pgprot); 86 } 87 #endif 88 89 #ifdef __HAVE_ARCH_PTE_DEVMAP 90 static inline bool pfn_t_devmap(pfn_t pfn) 91 { 92 const u64 flags = PFN_DEV|PFN_MAP; 93 94 return (pfn.val & flags) == flags; 95 } 96 #else 97 static inline bool pfn_t_devmap(pfn_t pfn) 98 { 99 return false; 100 } 101 pte_t pte_mkdevmap(pte_t pte); 102 pmd_t pmd_mkdevmap(pmd_t pmd); 103 #endif 104 #endif /* _LINUX_PFN_T_H_ */ 105