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