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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - include/linux/pfn_t.h
1 #ifndef _LINUX_PFN_T_H_
2 #define _LINUX_PFN_T_H_
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
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))
18 static inline pfn_t
__pfn_to_pfn_t(unsigned long pfn
, u64 flags
)
20 pfn_t pfn_t
= { .val
= pfn
| (flags
& PFN_FLAGS_MASK
), };
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
)
28 return __pfn_to_pfn_t(pfn
, 0);
31 extern pfn_t
phys_to_pfn_t(phys_addr_t addr
, u64 flags
);
33 static inline bool pfn_t_has_page(pfn_t pfn
)
35 return (pfn
.val
& PFN_MAP
) == PFN_MAP
|| (pfn
.val
& PFN_DEV
) == 0;
38 static inline unsigned long pfn_t_to_pfn(pfn_t pfn
)
40 return pfn
.val
& ~PFN_FLAGS_MASK
;
43 static inline struct page
*pfn_t_to_page(pfn_t pfn
)
45 if (pfn_t_has_page(pfn
))
46 return pfn_to_page(pfn_t_to_pfn(pfn
));
50 static inline phys_addr_t
pfn_t_to_phys(pfn_t pfn
)
52 return PFN_PHYS(pfn_t_to_pfn(pfn
));
55 static inline void *pfn_t_to_virt(pfn_t pfn
)
57 if (pfn_t_has_page(pfn
))
58 return __va(pfn_t_to_phys(pfn
));
62 static inline pfn_t
page_to_pfn_t(struct page
*page
)
64 return pfn_to_pfn_t(page_to_pfn(page
));
67 static inline int pfn_t_valid(pfn_t pfn
)
69 return pfn_valid(pfn_t_to_pfn(pfn
));
73 static inline pte_t
pfn_t_pte(pfn_t pfn
, pgprot_t pgprot
)
75 return pfn_pte(pfn_t_to_pfn(pfn
), pgprot
);
79 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
80 static inline pmd_t
pfn_t_pmd(pfn_t pfn
, pgprot_t pgprot
)
82 return pfn_pmd(pfn_t_to_pfn(pfn
), pgprot
);
86 #ifdef __HAVE_ARCH_PTE_DEVMAP
87 static inline bool pfn_t_devmap(pfn_t pfn
)
89 const u64 flags
= PFN_DEV
|PFN_MAP
;
91 return (pfn
.val
& flags
) == flags
;
94 static inline bool pfn_t_devmap(pfn_t pfn
)
98 pte_t
pte_mkdevmap(pte_t pte
);
99 pmd_t
pmd_mkdevmap(pmd_t pmd
);
101 #endif /* _LINUX_PFN_T_H_ */