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
18static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, u64 flags)
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() */
26static inline pfn_t pfn_to_pfn_t(unsigned long pfn)
27{
28 return __pfn_to_pfn_t(pfn, 0);
29}
30
31static 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}
35
36static 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
41static inline unsigned long pfn_t_to_pfn(pfn_t pfn)
42{
43 return pfn.val & ~PFN_FLAGS_MASK;
44}
45
46static 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
53static inline phys_addr_t pfn_t_to_phys(pfn_t pfn)
54{
55 return PFN_PHYS(pfn_t_to_pfn(pfn));
56}
57
58static 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
65static inline pfn_t page_to_pfn_t(struct page *page)
66{
67 return pfn_to_pfn_t(page_to_pfn(page));
68}
69
70static inline int pfn_t_valid(pfn_t pfn)
71{
72 return pfn_valid(pfn_t_to_pfn(pfn));
73}
74
75#ifdef CONFIG_MMU
76static 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
82#ifdef CONFIG_TRANSPARENT_HUGEPAGE
83static 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
89#ifdef __HAVE_ARCH_PTE_DEVMAP
90static inline bool pfn_t_devmap(pfn_t pfn)
91{
92 const u64 flags = PFN_DEV|PFN_MAP;
93
94 return (pfn.val & flags) == flags;
95}
96#else
97static inline bool pfn_t_devmap(pfn_t pfn)
98{
99 return false;
100}
101pte_t pte_mkdevmap(pte_t pte);
102pmd_t pmd_mkdevmap(pmd_t pmd);
103#endif
104#endif /* _LINUX_PFN_T_H_ */