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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
34c0fd54 DW |
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 | |
cc4b8c79 YS |
12 | * PFN_SPECIAL - for CONFIG_FS_DAX_LIMITED builds to allow XIP, but not |
13 | * get_user_pages | |
34c0fd54 | 14 | */ |
4d54954a | 15 | #define PFN_FLAGS_MASK (((u64) (~PAGE_MASK)) << (BITS_PER_LONG_LONG - PAGE_SHIFT)) |
db78c222 DW |
16 | #define PFN_SG_CHAIN (1ULL << (BITS_PER_LONG_LONG - 1)) |
17 | #define PFN_SG_LAST (1ULL << (BITS_PER_LONG_LONG - 2)) | |
18 | #define PFN_DEV (1ULL << (BITS_PER_LONG_LONG - 3)) | |
19 | #define PFN_MAP (1ULL << (BITS_PER_LONG_LONG - 4)) | |
785a3fab | 20 | #define PFN_SPECIAL (1ULL << (BITS_PER_LONG_LONG - 5)) |
db78c222 | 21 | |
27a7ffac | 22 | #define PFN_FLAGS_TRACE \ |
785a3fab | 23 | { PFN_SPECIAL, "SPECIAL" }, \ |
27a7ffac RZ |
24 | { PFN_SG_CHAIN, "SG_CHAIN" }, \ |
25 | { PFN_SG_LAST, "SG_LAST" }, \ | |
26 | { PFN_DEV, "DEV" }, \ | |
27 | { PFN_MAP, "MAP" } | |
28 | ||
db78c222 | 29 | static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, u64 flags) |
34c0fd54 DW |
30 | { |
31 | pfn_t pfn_t = { .val = pfn | (flags & PFN_FLAGS_MASK), }; | |
32 | ||
33 | return pfn_t; | |
34 | } | |
35 | ||
36 | /* a default pfn to pfn_t conversion assumes that @pfn is pfn_valid() */ | |
37 | static inline pfn_t pfn_to_pfn_t(unsigned long pfn) | |
38 | { | |
39 | return __pfn_to_pfn_t(pfn, 0); | |
40 | } | |
41 | ||
f295e53b DW |
42 | static inline pfn_t phys_to_pfn_t(phys_addr_t addr, u64 flags) |
43 | { | |
44 | return __pfn_to_pfn_t(addr >> PAGE_SHIFT, flags); | |
45 | } | |
34c0fd54 DW |
46 | |
47 | static inline bool pfn_t_has_page(pfn_t pfn) | |
48 | { | |
49 | return (pfn.val & PFN_MAP) == PFN_MAP || (pfn.val & PFN_DEV) == 0; | |
50 | } | |
51 | ||
52 | static inline unsigned long pfn_t_to_pfn(pfn_t pfn) | |
53 | { | |
54 | return pfn.val & ~PFN_FLAGS_MASK; | |
55 | } | |
56 | ||
57 | static inline struct page *pfn_t_to_page(pfn_t pfn) | |
58 | { | |
59 | if (pfn_t_has_page(pfn)) | |
60 | return pfn_to_page(pfn_t_to_pfn(pfn)); | |
61 | return NULL; | |
62 | } | |
63 | ||
76e9f0ee | 64 | static inline phys_addr_t pfn_t_to_phys(pfn_t pfn) |
34c0fd54 DW |
65 | { |
66 | return PFN_PHYS(pfn_t_to_pfn(pfn)); | |
67 | } | |
68 | ||
69 | static inline void *pfn_t_to_virt(pfn_t pfn) | |
70 | { | |
71 | if (pfn_t_has_page(pfn)) | |
72 | return __va(pfn_t_to_phys(pfn)); | |
73 | return NULL; | |
74 | } | |
75 | ||
76 | static inline pfn_t page_to_pfn_t(struct page *page) | |
77 | { | |
78 | return pfn_to_pfn_t(page_to_pfn(page)); | |
79 | } | |
01c8f1c4 DW |
80 | |
81 | static inline int pfn_t_valid(pfn_t pfn) | |
82 | { | |
83 | return pfn_valid(pfn_t_to_pfn(pfn)); | |
84 | } | |
85 | ||
86 | #ifdef CONFIG_MMU | |
87 | static inline pte_t pfn_t_pte(pfn_t pfn, pgprot_t pgprot) | |
88 | { | |
89 | return pfn_pte(pfn_t_to_pfn(pfn), pgprot); | |
90 | } | |
91 | #endif | |
92 | ||
f25748e3 DW |
93 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
94 | static inline pmd_t pfn_t_pmd(pfn_t pfn, pgprot_t pgprot) | |
95 | { | |
96 | return pfn_pmd(pfn_t_to_pfn(pfn), pgprot); | |
97 | } | |
a00cc7d9 MW |
98 | |
99 | #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD | |
100 | static inline pud_t pfn_t_pud(pfn_t pfn, pgprot_t pgprot) | |
101 | { | |
102 | return pfn_pud(pfn_t_to_pfn(pfn), pgprot); | |
103 | } | |
104 | #endif | |
f25748e3 DW |
105 | #endif |
106 | ||
01c8f1c4 DW |
107 | #ifdef __HAVE_ARCH_PTE_DEVMAP |
108 | static inline bool pfn_t_devmap(pfn_t pfn) | |
109 | { | |
db78c222 | 110 | const u64 flags = PFN_DEV|PFN_MAP; |
01c8f1c4 DW |
111 | |
112 | return (pfn.val & flags) == flags; | |
113 | } | |
114 | #else | |
115 | static inline bool pfn_t_devmap(pfn_t pfn) | |
116 | { | |
117 | return false; | |
118 | } | |
119 | pte_t pte_mkdevmap(pte_t pte); | |
f25748e3 | 120 | pmd_t pmd_mkdevmap(pmd_t pmd); |
a00cc7d9 MW |
121 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) && \ |
122 | defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD) | |
123 | pud_t pud_mkdevmap(pud_t pud); | |
01c8f1c4 | 124 | #endif |
a00cc7d9 MW |
125 | #endif /* __HAVE_ARCH_PTE_DEVMAP */ |
126 | ||
3010a5ea | 127 | #ifdef CONFIG_ARCH_HAS_PTE_SPECIAL |
785a3fab DW |
128 | static inline bool pfn_t_special(pfn_t pfn) |
129 | { | |
130 | return (pfn.val & PFN_SPECIAL) == PFN_SPECIAL; | |
131 | } | |
132 | #else | |
133 | static inline bool pfn_t_special(pfn_t pfn) | |
134 | { | |
135 | return false; | |
136 | } | |
3010a5ea | 137 | #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */ |
34c0fd54 | 138 | #endif /* _LINUX_PFN_T_H_ */ |