a00cc7d9dd
The current transparent hugepage code only supports PMDs. This patch adds support for transparent use of PUDs with DAX. It does not include support for anonymous pages. x86 support code also added. Most of this patch simply parallels the work that was done for huge PMDs. The only major difference is how the new ->pud_entry method in mm_walk works. The ->pmd_entry method replaces the ->pte_entry method, whereas the ->pud_entry method works along with either ->pmd_entry or ->pte_entry. The pagewalk code takes care of locking the PUD before calling ->pud_walk, so handlers do not need to worry whether the PUD is stable. [dave.jiang@intel.com: fix SMP x86 32bit build for native_pud_clear()] Link: http://lkml.kernel.org/r/148719066814.31111.3239231168815337012.stgit@djiang5-desk3.ch.intel.com [dave.jiang@intel.com: native_pud_clear missing on i386 build] Link: http://lkml.kernel.org/r/148640375195.69754.3315433724330910314.stgit@djiang5-desk3.ch.intel.com Link: http://lkml.kernel.org/r/148545059381.17912.8602162635537598445.stgit@djiang5-desk3.ch.intel.com Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com> Signed-off-by: Dave Jiang <dave.jiang@intel.com> Tested-by: Alexander Kapshuk <alexander.kapshuk@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Jan Kara <jack@suse.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Nilesh Choudhury <nilesh.choudhury@oracle.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
123 lines
2.9 KiB
C
123 lines
2.9 KiB
C
#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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*/
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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_FLAGS_TRACE \
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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 void *pfn_t_to_virt(pfn_t pfn)
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{
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if (pfn_t_has_page(pfn))
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return __va(pfn_t_to_phys(pfn));
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return NULL;
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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 __HAVE_ARCH_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 /* __HAVE_ARCH_PTE_DEVMAP */
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#endif /* _LINUX_PFN_T_H_ */
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