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34c0fd54 DW |
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 | */ | |
db78c222 DW |
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) | |
34c0fd54 DW |
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 | ||
f295e53b DW |
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 | } | |
34c0fd54 DW |
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 | ||
76e9f0ee | 53 | static inline phys_addr_t pfn_t_to_phys(pfn_t pfn) |
34c0fd54 DW |
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 | } | |
01c8f1c4 DW |
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 | ||
f25748e3 DW |
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 | ||
01c8f1c4 DW |
89 | #ifdef __HAVE_ARCH_PTE_DEVMAP |
90 | static inline bool pfn_t_devmap(pfn_t pfn) | |
91 | { | |
db78c222 | 92 | const u64 flags = PFN_DEV|PFN_MAP; |
01c8f1c4 DW |
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); | |
f25748e3 | 102 | pmd_t pmd_mkdevmap(pmd_t pmd); |
01c8f1c4 | 103 | #endif |
34c0fd54 | 104 | #endif /* _LINUX_PFN_T_H_ */ |