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Dan Williams34c0fd52016-01-15 16:56:14 -08001#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 */
Dan Williamsdb78c222016-02-11 16:13:17 -080012#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))
Dan Williams34c0fd52016-01-15 16:56:14 -080017
Dan Williamsdb78c222016-02-11 16:13:17 -080018static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, u64 flags)
Dan Williams34c0fd52016-01-15 16:56:14 -080019{
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
Dan Williamsdb78c222016-02-11 16:13:17 -080031extern pfn_t phys_to_pfn_t(phys_addr_t addr, u64 flags);
Dan Williams34c0fd52016-01-15 16:56:14 -080032
33static inline bool pfn_t_has_page(pfn_t pfn)
34{
35 return (pfn.val & PFN_MAP) == PFN_MAP || (pfn.val & PFN_DEV) == 0;
36}
37
38static inline unsigned long pfn_t_to_pfn(pfn_t pfn)
39{
40 return pfn.val & ~PFN_FLAGS_MASK;
41}
42
43static inline struct page *pfn_t_to_page(pfn_t pfn)
44{
45 if (pfn_t_has_page(pfn))
46 return pfn_to_page(pfn_t_to_pfn(pfn));
47 return NULL;
48}
49
Dan Williams76e9f0e2016-01-22 09:43:28 -080050static inline phys_addr_t pfn_t_to_phys(pfn_t pfn)
Dan Williams34c0fd52016-01-15 16:56:14 -080051{
52 return PFN_PHYS(pfn_t_to_pfn(pfn));
53}
54
55static inline void *pfn_t_to_virt(pfn_t pfn)
56{
57 if (pfn_t_has_page(pfn))
58 return __va(pfn_t_to_phys(pfn));
59 return NULL;
60}
61
62static inline pfn_t page_to_pfn_t(struct page *page)
63{
64 return pfn_to_pfn_t(page_to_pfn(page));
65}
Dan Williams01c8f1c2016-01-15 16:56:40 -080066
67static inline int pfn_t_valid(pfn_t pfn)
68{
69 return pfn_valid(pfn_t_to_pfn(pfn));
70}
71
72#ifdef CONFIG_MMU
73static inline pte_t pfn_t_pte(pfn_t pfn, pgprot_t pgprot)
74{
75 return pfn_pte(pfn_t_to_pfn(pfn), pgprot);
76}
77#endif
78
Dan Williamsf25748e32016-01-15 16:56:43 -080079#ifdef CONFIG_TRANSPARENT_HUGEPAGE
80static inline pmd_t pfn_t_pmd(pfn_t pfn, pgprot_t pgprot)
81{
82 return pfn_pmd(pfn_t_to_pfn(pfn), pgprot);
83}
84#endif
85
Dan Williams01c8f1c2016-01-15 16:56:40 -080086#ifdef __HAVE_ARCH_PTE_DEVMAP
87static inline bool pfn_t_devmap(pfn_t pfn)
88{
Dan Williamsdb78c222016-02-11 16:13:17 -080089 const u64 flags = PFN_DEV|PFN_MAP;
Dan Williams01c8f1c2016-01-15 16:56:40 -080090
91 return (pfn.val & flags) == flags;
92}
93#else
94static inline bool pfn_t_devmap(pfn_t pfn)
95{
96 return false;
97}
98pte_t pte_mkdevmap(pte_t pte);
Dan Williamsf25748e32016-01-15 16:56:43 -080099pmd_t pmd_mkdevmap(pmd_t pmd);
Dan Williams01c8f1c2016-01-15 16:56:40 -0800100#endif
Dan Williams34c0fd52016-01-15 16:56:14 -0800101#endif /* _LINUX_PFN_T_H_ */