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Release 4.12 include/linux/pfn_t.h

Directory: include/linux
#ifndef _LINUX_PFN_T_H_

#define _LINUX_PFN_T_H_
#include <linux/mm.h>

/*
 * PFN_FLAGS_MASK - mask of all the possible valid pfn_t flags
 * PFN_SG_CHAIN - pfn is a pointer to the next scatterlist entry
 * PFN_SG_LAST - pfn references a page and is the last scatterlist entry
 * PFN_DEV - pfn is not covered by system memmap by default
 * PFN_MAP - pfn has a dynamic page mapping established by a device driver
 */

#define PFN_FLAGS_MASK (((u64) ~PAGE_MASK) << (BITS_PER_LONG_LONG - PAGE_SHIFT))

#define PFN_SG_CHAIN (1ULL << (BITS_PER_LONG_LONG - 1))

#define PFN_SG_LAST (1ULL << (BITS_PER_LONG_LONG - 2))

#define PFN_DEV (1ULL << (BITS_PER_LONG_LONG - 3))

#define PFN_MAP (1ULL << (BITS_PER_LONG_LONG - 4))


#define PFN_FLAGS_TRACE \
	{ PFN_SG_CHAIN, "SG_CHAIN" }, \
        { PFN_SG_LAST,  "SG_LAST" }, \
        { PFN_DEV,      "DEV" }, \
        { PFN_MAP,      "MAP" }


static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, u64 flags) { pfn_t pfn_t = { .val = pfn | (flags & PFN_FLAGS_MASK), }; return pfn_t; }

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/* a default pfn to pfn_t conversion assumes that @pfn is pfn_valid() */
static inline pfn_t pfn_to_pfn_t(unsigned long pfn) { return __pfn_to_pfn_t(pfn, 0); }

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static inline pfn_t phys_to_pfn_t(phys_addr_t addr, u64 flags) { return __pfn_to_pfn_t(addr >> PAGE_SHIFT, flags); }

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static inline bool pfn_t_has_page(pfn_t pfn) { return (pfn.val & PFN_MAP) == PFN_MAP || (pfn.val & PFN_DEV) == 0; }

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static inline unsigned long pfn_t_to_pfn(pfn_t pfn) { return pfn.val & ~PFN_FLAGS_MASK; }

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static inline struct page *pfn_t_to_page(pfn_t pfn) { if (pfn_t_has_page(pfn)) return pfn_to_page(pfn_t_to_pfn(pfn)); return NULL; }

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static inline phys_addr_t pfn_t_to_phys(pfn_t pfn) { return PFN_PHYS(pfn_t_to_pfn(pfn)); }

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static inline void *pfn_t_to_virt(pfn_t pfn) { if (pfn_t_has_page(pfn)) return __va(pfn_t_to_phys(pfn)); return NULL; }

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static inline pfn_t page_to_pfn_t(struct page *page) { return pfn_to_pfn_t(page_to_pfn(page)); }

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static inline int pfn_t_valid(pfn_t pfn) { return pfn_valid(pfn_t_to_pfn(pfn)); }

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#ifdef CONFIG_MMU
static inline pte_t pfn_t_pte(pfn_t pfn, pgprot_t pgprot) { return pfn_pte(pfn_t_to_pfn(pfn), pgprot); }

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#endif #ifdef CONFIG_TRANSPARENT_HUGEPAGE
static inline pmd_t pfn_t_pmd(pfn_t pfn, pgprot_t pgprot) { return pfn_pmd(pfn_t_to_pfn(pfn), pgprot); }

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#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
static inline pud_t pfn_t_pud(pfn_t pfn, pgprot_t pgprot) { return pfn_pud(pfn_t_to_pfn(pfn), pgprot); }

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#endif #endif #ifdef __HAVE_ARCH_PTE_DEVMAP
static inline bool pfn_t_devmap(pfn_t pfn) { const u64 flags = PFN_DEV|PFN_MAP; return (pfn.val & flags) == flags; }

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#else
static inline bool pfn_t_devmap(pfn_t pfn) { return false; }

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pte_t pte_mkdevmap(pte_t pte); pmd_t pmd_mkdevmap(pmd_t pmd); #if defined(CONFIG_TRANSPARENT_HUGEPAGE) && \ defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD) pud_t pud_mkdevmap(pud_t pud); #endif #endif /* __HAVE_ARCH_PTE_DEVMAP */ #endif /* _LINUX_PFN_T_H_ */

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Directory: include/linux
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