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 /* 7 * PFN_FLAGS_MASK - mask of all the possible valid pfn_t flags 8 * PFN_SG_CHAIN - pfn is a pointer to the next scatterlist entry 9 * PFN_SG_LAST - pfn references a page and is the last scatterlist entry 10 * PFN_DEV - pfn is not covered by system memmap by default 11 * PFN_MAP - pfn has a dynamic page mapping established by a device driver 12 */ 13 #define PFN_FLAGS_MASK (((u64) ~PAGE_MASK) << (BITS_PER_LONG_LONG - PAGE_SHIFT)) 14 #define PFN_SG_CHAIN (1ULL << (BITS_PER_LONG_LONG - 1)) 15 #define PFN_SG_LAST (1ULL << (BITS_PER_LONG_LONG - 2)) 16 #define PFN_DEV (1ULL << (BITS_PER_LONG_LONG - 3)) 17 #define PFN_MAP (1ULL << (BITS_PER_LONG_LONG - 4)) 18 19 #define PFN_FLAGS_TRACE \ 20 { PFN_SG_CHAIN, "SG_CHAIN" }, \ 21 { PFN_SG_LAST, "SG_LAST" }, \ 22 { PFN_DEV, "DEV" }, \ 23 { PFN_MAP, "MAP" } 24 25 static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, u64 flags) 26 { 27 pfn_t pfn_t = { .val = pfn | (flags & PFN_FLAGS_MASK), }; 28 29 return pfn_t; 30 } 31 32 /* a default pfn to pfn_t conversion assumes that @pfn is pfn_valid() */ 33 static inline pfn_t pfn_to_pfn_t(unsigned long pfn) 34 { 35 return __pfn_to_pfn_t(pfn, 0); 36 } 37 38 static inline pfn_t phys_to_pfn_t(phys_addr_t addr, u64 flags) 39 { 40 return __pfn_to_pfn_t(addr >> PAGE_SHIFT, flags); 41 } 42 43 static inline bool pfn_t_has_page(pfn_t pfn) 44 { 45 return (pfn.val & PFN_MAP) == PFN_MAP || (pfn.val & PFN_DEV) == 0; 46 } 47 48 static inline unsigned long pfn_t_to_pfn(pfn_t pfn) 49 { 50 return pfn.val & ~PFN_FLAGS_MASK; 51 } 52 53 static inline struct page *pfn_t_to_page(pfn_t pfn) 54 { 55 if (pfn_t_has_page(pfn)) 56 return pfn_to_page(pfn_t_to_pfn(pfn)); 57 return NULL; 58 } 59 60 static inline phys_addr_t pfn_t_to_phys(pfn_t pfn) 61 { 62 return PFN_PHYS(pfn_t_to_pfn(pfn)); 63 } 64 65 static inline void *pfn_t_to_virt(pfn_t pfn) 66 { 67 if (pfn_t_has_page(pfn)) 68 return __va(pfn_t_to_phys(pfn)); 69 return NULL; 70 } 71 72 static inline pfn_t page_to_pfn_t(struct page *page) 73 { 74 return pfn_to_pfn_t(page_to_pfn(page)); 75 } 76 77 static inline int pfn_t_valid(pfn_t pfn) 78 { 79 return pfn_valid(pfn_t_to_pfn(pfn)); 80 } 81 82 #ifdef CONFIG_MMU 83 static inline pte_t pfn_t_pte(pfn_t pfn, pgprot_t pgprot) 84 { 85 return pfn_pte(pfn_t_to_pfn(pfn), pgprot); 86 } 87 #endif 88 89 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 90 static inline pmd_t pfn_t_pmd(pfn_t pfn, pgprot_t pgprot) 91 { 92 return pfn_pmd(pfn_t_to_pfn(pfn), pgprot); 93 } 94 95 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD 96 static inline pud_t pfn_t_pud(pfn_t pfn, pgprot_t pgprot) 97 { 98 return pfn_pud(pfn_t_to_pfn(pfn), pgprot); 99 } 100 #endif 101 #endif 102 103 #ifdef __HAVE_ARCH_PTE_DEVMAP 104 static inline bool pfn_t_devmap(pfn_t pfn) 105 { 106 const u64 flags = PFN_DEV|PFN_MAP; 107 108 return (pfn.val & flags) == flags; 109 } 110 #else 111 static inline bool pfn_t_devmap(pfn_t pfn) 112 { 113 return false; 114 } 115 pte_t pte_mkdevmap(pte_t pte); 116 pmd_t pmd_mkdevmap(pmd_t pmd); 117 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) && \ 118 defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD) 119 pud_t pud_mkdevmap(pud_t pud); 120 #endif 121 #endif /* __HAVE_ARCH_PTE_DEVMAP */ 122 123 #endif /* _LINUX_PFN_T_H_ */ 124