tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
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
12 */
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))
18
19#define PFN_FLAGS_TRACE \
20 { PFN_SG_CHAIN, "SG_CHAIN" }, \
21 { PFN_SG_LAST, "SG_LAST" }, \
22 { PFN_DEV, "DEV" }, \
23 { PFN_MAP, "MAP" }
24
25static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, u64 flags)
26{
27 pfn_t pfn_t = { .val = pfn | (flags & PFN_FLAGS_MASK), };
28
29 return pfn_t;
30}
31
32/* a default pfn to pfn_t conversion assumes that @pfn is pfn_valid() */
33static inline pfn_t pfn_to_pfn_t(unsigned long pfn)
34{
35 return __pfn_to_pfn_t(pfn, 0);
36}
37
38static inline pfn_t phys_to_pfn_t(phys_addr_t addr, u64 flags)
39{
40 return __pfn_to_pfn_t(addr >> PAGE_SHIFT, flags);
41}
42
43static inline bool pfn_t_has_page(pfn_t pfn)
44{
45 return (pfn.val & PFN_MAP) == PFN_MAP || (pfn.val & PFN_DEV) == 0;
46}
47
48static inline unsigned long pfn_t_to_pfn(pfn_t pfn)
49{
50 return pfn.val & ~PFN_FLAGS_MASK;
51}
52
53static inline struct page *pfn_t_to_page(pfn_t pfn)
54{
55 if (pfn_t_has_page(pfn))
56 return pfn_to_page(pfn_t_to_pfn(pfn));
57 return NULL;
58}
59
60static inline phys_addr_t pfn_t_to_phys(pfn_t pfn)
61{
62 return PFN_PHYS(pfn_t_to_pfn(pfn));
63}
64
65static inline void *pfn_t_to_virt(pfn_t pfn)
66{
67 if (pfn_t_has_page(pfn))
68 return __va(pfn_t_to_phys(pfn));
69 return NULL;
70}
71
72static inline pfn_t page_to_pfn_t(struct page *page)
73{
74 return pfn_to_pfn_t(page_to_pfn(page));
75}
76
77static inline int pfn_t_valid(pfn_t pfn)
78{
79 return pfn_valid(pfn_t_to_pfn(pfn));
80}
81
82#ifdef CONFIG_MMU
83static inline pte_t pfn_t_pte(pfn_t pfn, pgprot_t pgprot)
84{
85 return pfn_pte(pfn_t_to_pfn(pfn), pgprot);
86}
87#endif
88
89#ifdef CONFIG_TRANSPARENT_HUGEPAGE
90static inline pmd_t pfn_t_pmd(pfn_t pfn, pgprot_t pgprot)
91{
92 return pfn_pmd(pfn_t_to_pfn(pfn), pgprot);
93}
94
95#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
96static inline pud_t pfn_t_pud(pfn_t pfn, pgprot_t pgprot)
97{
98 return pfn_pud(pfn_t_to_pfn(pfn), pgprot);
99}
100#endif
101#endif
102
103#ifdef __HAVE_ARCH_PTE_DEVMAP
104static inline bool pfn_t_devmap(pfn_t pfn)
105{
106 const u64 flags = PFN_DEV|PFN_MAP;
107
108 return (pfn.val & flags) == flags;
109}
110#else
111static inline bool pfn_t_devmap(pfn_t pfn)
112{
113 return false;
114}
115pte_t pte_mkdevmap(pte_t pte);
116pmd_t pmd_mkdevmap(pmd_t pmd);
117#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && \
118 defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)
119pud_t pud_mkdevmap(pud_t pud);
120#endif
121#endif /* __HAVE_ARCH_PTE_DEVMAP */
122
123#endif /* _LINUX_PFN_T_H_ */