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131 lines
3.2 KiB
131 lines
3.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_PFN_T_H_ |
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#define _LINUX_PFN_T_H_ |
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#include <linux/mm.h> |
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/* |
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* PFN_FLAGS_MASK - mask of all the possible valid pfn_t flags |
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* PFN_SG_CHAIN - pfn is a pointer to the next scatterlist entry |
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* PFN_SG_LAST - pfn references a page and is the last scatterlist entry |
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* PFN_DEV - pfn is not covered by system memmap by default |
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* PFN_MAP - pfn has a dynamic page mapping established by a device driver |
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* PFN_SPECIAL - for CONFIG_FS_DAX_LIMITED builds to allow XIP, but not |
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* get_user_pages |
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*/ |
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#define PFN_FLAGS_MASK (((u64) (~PAGE_MASK)) << (BITS_PER_LONG_LONG - PAGE_SHIFT)) |
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#define PFN_SG_CHAIN (1ULL << (BITS_PER_LONG_LONG - 1)) |
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#define PFN_SG_LAST (1ULL << (BITS_PER_LONG_LONG - 2)) |
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#define PFN_DEV (1ULL << (BITS_PER_LONG_LONG - 3)) |
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#define PFN_MAP (1ULL << (BITS_PER_LONG_LONG - 4)) |
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#define PFN_SPECIAL (1ULL << (BITS_PER_LONG_LONG - 5)) |
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#define PFN_FLAGS_TRACE \ |
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{ PFN_SPECIAL, "SPECIAL" }, \ |
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{ PFN_SG_CHAIN, "SG_CHAIN" }, \ |
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{ PFN_SG_LAST, "SG_LAST" }, \ |
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{ PFN_DEV, "DEV" }, \ |
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{ PFN_MAP, "MAP" } |
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static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, u64 flags) |
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{ |
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pfn_t pfn_t = { .val = pfn | (flags & PFN_FLAGS_MASK), }; |
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return pfn_t; |
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} |
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/* a default pfn to pfn_t conversion assumes that @pfn is pfn_valid() */ |
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static inline pfn_t pfn_to_pfn_t(unsigned long pfn) |
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{ |
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return __pfn_to_pfn_t(pfn, 0); |
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} |
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static inline pfn_t phys_to_pfn_t(phys_addr_t addr, u64 flags) |
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{ |
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return __pfn_to_pfn_t(addr >> PAGE_SHIFT, flags); |
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} |
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static inline bool pfn_t_has_page(pfn_t pfn) |
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{ |
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return (pfn.val & PFN_MAP) == PFN_MAP || (pfn.val & PFN_DEV) == 0; |
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} |
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static inline unsigned long pfn_t_to_pfn(pfn_t pfn) |
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{ |
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return pfn.val & ~PFN_FLAGS_MASK; |
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} |
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static inline struct page *pfn_t_to_page(pfn_t pfn) |
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{ |
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if (pfn_t_has_page(pfn)) |
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return pfn_to_page(pfn_t_to_pfn(pfn)); |
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return NULL; |
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} |
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static inline phys_addr_t pfn_t_to_phys(pfn_t pfn) |
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{ |
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return PFN_PHYS(pfn_t_to_pfn(pfn)); |
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} |
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static inline pfn_t page_to_pfn_t(struct page *page) |
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{ |
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return pfn_to_pfn_t(page_to_pfn(page)); |
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} |
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static inline int pfn_t_valid(pfn_t pfn) |
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{ |
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return pfn_valid(pfn_t_to_pfn(pfn)); |
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} |
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#ifdef CONFIG_MMU |
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static inline pte_t pfn_t_pte(pfn_t pfn, pgprot_t pgprot) |
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{ |
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return pfn_pte(pfn_t_to_pfn(pfn), pgprot); |
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} |
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#endif |
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
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static inline pmd_t pfn_t_pmd(pfn_t pfn, pgprot_t pgprot) |
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{ |
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return pfn_pmd(pfn_t_to_pfn(pfn), pgprot); |
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} |
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#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD |
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static inline pud_t pfn_t_pud(pfn_t pfn, pgprot_t pgprot) |
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{ |
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return pfn_pud(pfn_t_to_pfn(pfn), pgprot); |
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} |
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#endif |
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#endif |
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#ifdef CONFIG_ARCH_HAS_PTE_DEVMAP |
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static inline bool pfn_t_devmap(pfn_t pfn) |
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{ |
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const u64 flags = PFN_DEV|PFN_MAP; |
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return (pfn.val & flags) == flags; |
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} |
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#else |
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static inline bool pfn_t_devmap(pfn_t pfn) |
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{ |
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return false; |
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} |
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pte_t pte_mkdevmap(pte_t pte); |
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pmd_t pmd_mkdevmap(pmd_t pmd); |
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#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && \ |
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defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD) |
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pud_t pud_mkdevmap(pud_t pud); |
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#endif |
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#endif /* CONFIG_ARCH_HAS_PTE_DEVMAP */ |
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#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL |
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static inline bool pfn_t_special(pfn_t pfn) |
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{ |
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return (pfn.val & PFN_SPECIAL) == PFN_SPECIAL; |
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} |
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#else |
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static inline bool pfn_t_special(pfn_t pfn) |
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{ |
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return false; |
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} |
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#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */ |
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#endif /* _LINUX_PFN_T_H_ */
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