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1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_PFN_T_H_
3 #define _LINUX_PFN_T_H_
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
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))
19 #define PFN_FLAGS_TRACE \
20 { PFN_SG_CHAIN, "SG_CHAIN" }, \
21 { PFN_SG_LAST, "SG_LAST" }, \
25 static inline pfn_t
__pfn_to_pfn_t(unsigned long pfn
, u64 flags
)
27 pfn_t pfn_t
= { .val
= pfn
| (flags
& PFN_FLAGS_MASK
), };
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
)
35 return __pfn_to_pfn_t(pfn
, 0);
38 static inline pfn_t
phys_to_pfn_t(phys_addr_t addr
, u64 flags
)
40 return __pfn_to_pfn_t(addr
>> PAGE_SHIFT
, flags
);
43 static inline bool pfn_t_has_page(pfn_t pfn
)
45 return (pfn
.val
& PFN_MAP
) == PFN_MAP
|| (pfn
.val
& PFN_DEV
) == 0;
48 static inline unsigned long pfn_t_to_pfn(pfn_t pfn
)
50 return pfn
.val
& ~PFN_FLAGS_MASK
;
53 static inline struct page
*pfn_t_to_page(pfn_t pfn
)
55 if (pfn_t_has_page(pfn
))
56 return pfn_to_page(pfn_t_to_pfn(pfn
));
60 static inline phys_addr_t
pfn_t_to_phys(pfn_t pfn
)
62 return PFN_PHYS(pfn_t_to_pfn(pfn
));
65 static inline void *pfn_t_to_virt(pfn_t pfn
)
67 if (pfn_t_has_page(pfn
))
68 return __va(pfn_t_to_phys(pfn
));
72 static inline pfn_t
page_to_pfn_t(struct page
*page
)
74 return pfn_to_pfn_t(page_to_pfn(page
));
77 static inline int pfn_t_valid(pfn_t pfn
)
79 return pfn_valid(pfn_t_to_pfn(pfn
));
83 static inline pte_t
pfn_t_pte(pfn_t pfn
, pgprot_t pgprot
)
85 return pfn_pte(pfn_t_to_pfn(pfn
), pgprot
);
89 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
90 static inline pmd_t
pfn_t_pmd(pfn_t pfn
, pgprot_t pgprot
)
92 return pfn_pmd(pfn_t_to_pfn(pfn
), pgprot
);
95 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
96 static inline pud_t
pfn_t_pud(pfn_t pfn
, pgprot_t pgprot
)
98 return pfn_pud(pfn_t_to_pfn(pfn
), pgprot
);
103 #ifdef __HAVE_ARCH_PTE_DEVMAP
104 static inline bool pfn_t_devmap(pfn_t pfn
)
106 const u64 flags
= PFN_DEV
|PFN_MAP
;
108 return (pfn
.val
& flags
) == flags
;
111 static inline bool pfn_t_devmap(pfn_t pfn
)
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
);
121 #endif /* __HAVE_ARCH_PTE_DEVMAP */
123 #endif /* _LINUX_PFN_T_H_ */