Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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#define PFN_FLAGS_TRACE \
19 { PFN_SG_CHAIN, "SG_CHAIN" }, \
20 { PFN_SG_LAST, "SG_LAST" }, \
21 { PFN_DEV, "DEV" }, \
22 { PFN_MAP, "MAP" }
23
24static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, u64 flags)
25{
26 pfn_t pfn_t = { .val = pfn | (flags & PFN_FLAGS_MASK), };
27
28 return pfn_t;
29}
30
31/* a default pfn to pfn_t conversion assumes that @pfn is pfn_valid() */
32static inline pfn_t pfn_to_pfn_t(unsigned long pfn)
33{
34 return __pfn_to_pfn_t(pfn, 0);
35}
36
37static inline pfn_t phys_to_pfn_t(phys_addr_t addr, u64 flags)
38{
39 return __pfn_to_pfn_t(addr >> PAGE_SHIFT, flags);
40}
41
42static inline bool pfn_t_has_page(pfn_t pfn)
43{
44 return (pfn.val & PFN_MAP) == PFN_MAP || (pfn.val & PFN_DEV) == 0;
45}
46
47static inline unsigned long pfn_t_to_pfn(pfn_t pfn)
48{
49 return pfn.val & ~PFN_FLAGS_MASK;
50}
51
52static inline struct page *pfn_t_to_page(pfn_t pfn)
53{
54 if (pfn_t_has_page(pfn))
55 return pfn_to_page(pfn_t_to_pfn(pfn));
56 return NULL;
57}
58
59static inline phys_addr_t pfn_t_to_phys(pfn_t pfn)
60{
61 return PFN_PHYS(pfn_t_to_pfn(pfn));
62}
63
64static inline void *pfn_t_to_virt(pfn_t pfn)
65{
66 if (pfn_t_has_page(pfn))
67 return __va(pfn_t_to_phys(pfn));
68 return NULL;
69}
70
71static inline pfn_t page_to_pfn_t(struct page *page)
72{
73 return pfn_to_pfn_t(page_to_pfn(page));
74}
75
76static inline int pfn_t_valid(pfn_t pfn)
77{
78 return pfn_valid(pfn_t_to_pfn(pfn));
79}
80
81#ifdef CONFIG_MMU
82static inline pte_t pfn_t_pte(pfn_t pfn, pgprot_t pgprot)
83{
84 return pfn_pte(pfn_t_to_pfn(pfn), pgprot);
85}
86#endif
87
88#ifdef CONFIG_TRANSPARENT_HUGEPAGE
89static inline pmd_t pfn_t_pmd(pfn_t pfn, pgprot_t pgprot)
90{
91 return pfn_pmd(pfn_t_to_pfn(pfn), pgprot);
92}
93
94#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
95static inline pud_t pfn_t_pud(pfn_t pfn, pgprot_t pgprot)
96{
97 return pfn_pud(pfn_t_to_pfn(pfn), pgprot);
98}
99#endif
100#endif
101
102#ifdef __HAVE_ARCH_PTE_DEVMAP
103static inline bool pfn_t_devmap(pfn_t pfn)
104{
105 const u64 flags = PFN_DEV|PFN_MAP;
106
107 return (pfn.val & flags) == flags;
108}
109#else
110static inline bool pfn_t_devmap(pfn_t pfn)
111{
112 return false;
113}
114pte_t pte_mkdevmap(pte_t pte);
115pmd_t pmd_mkdevmap(pmd_t pmd);
116#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && \
117 defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)
118pud_t pud_mkdevmap(pud_t pud);
119#endif
120#endif /* __HAVE_ARCH_PTE_DEVMAP */
121
122#endif /* _LINUX_PFN_T_H_ */