1275 lines
34 KiB
C
1275 lines
34 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_HUGETLB_H
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#define _LINUX_HUGETLB_H
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#include <linux/mm.h>
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#include <linux/mm_types.h>
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#include <linux/mmdebug.h>
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#include <linux/fs.h>
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#include <linux/hugetlb_inline.h>
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#include <linux/cgroup.h>
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#include <linux/page_ref.h>
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#include <linux/list.h>
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#include <linux/kref.h>
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#include <linux/pgtable.h>
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#include <linux/gfp.h>
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#include <linux/userfaultfd_k.h>
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struct ctl_table;
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struct user_struct;
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struct mmu_gather;
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struct node;
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#ifndef CONFIG_ARCH_HAS_HUGEPD
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typedef struct { unsigned long pd; } hugepd_t;
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#define is_hugepd(hugepd) (0)
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#define __hugepd(x) ((hugepd_t) { (x) })
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#endif
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#ifdef CONFIG_HUGETLB_PAGE
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#include <linux/mempolicy.h>
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#include <linux/shm.h>
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#include <asm/tlbflush.h>
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/*
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* For HugeTLB page, there are more metadata to save in the struct page. But
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* the head struct page cannot meet our needs, so we have to abuse other tail
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* struct page to store the metadata.
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*/
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#define __NR_USED_SUBPAGE 3
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struct hugepage_subpool {
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spinlock_t lock;
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long count;
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long max_hpages; /* Maximum huge pages or -1 if no maximum. */
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long used_hpages; /* Used count against maximum, includes */
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/* both allocated and reserved pages. */
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struct hstate *hstate;
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long min_hpages; /* Minimum huge pages or -1 if no minimum. */
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long rsv_hpages; /* Pages reserved against global pool to */
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/* satisfy minimum size. */
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};
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struct resv_map {
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struct kref refs;
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spinlock_t lock;
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struct list_head regions;
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long adds_in_progress;
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struct list_head region_cache;
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long region_cache_count;
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#ifdef CONFIG_CGROUP_HUGETLB
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/*
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* On private mappings, the counter to uncharge reservations is stored
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* here. If these fields are 0, then either the mapping is shared, or
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* cgroup accounting is disabled for this resv_map.
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*/
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struct page_counter *reservation_counter;
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unsigned long pages_per_hpage;
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struct cgroup_subsys_state *css;
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#endif
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};
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/*
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* Region tracking -- allows tracking of reservations and instantiated pages
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* across the pages in a mapping.
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*
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* The region data structures are embedded into a resv_map and protected
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* by a resv_map's lock. The set of regions within the resv_map represent
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* reservations for huge pages, or huge pages that have already been
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* instantiated within the map. The from and to elements are huge page
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* indices into the associated mapping. from indicates the starting index
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* of the region. to represents the first index past the end of the region.
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*
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* For example, a file region structure with from == 0 and to == 4 represents
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* four huge pages in a mapping. It is important to note that the to element
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* represents the first element past the end of the region. This is used in
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* arithmetic as 4(to) - 0(from) = 4 huge pages in the region.
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*
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* Interval notation of the form [from, to) will be used to indicate that
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* the endpoint from is inclusive and to is exclusive.
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*/
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struct file_region {
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struct list_head link;
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long from;
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long to;
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#ifdef CONFIG_CGROUP_HUGETLB
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/*
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* On shared mappings, each reserved region appears as a struct
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* file_region in resv_map. These fields hold the info needed to
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* uncharge each reservation.
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*/
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struct page_counter *reservation_counter;
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struct cgroup_subsys_state *css;
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#endif
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};
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struct hugetlb_vma_lock {
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struct kref refs;
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struct rw_semaphore rw_sema;
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struct vm_area_struct *vma;
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};
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extern struct resv_map *resv_map_alloc(void);
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void resv_map_release(struct kref *ref);
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extern spinlock_t hugetlb_lock;
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extern int hugetlb_max_hstate __read_mostly;
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#define for_each_hstate(h) \
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for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
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struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
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long min_hpages);
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void hugepage_put_subpool(struct hugepage_subpool *spool);
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void hugetlb_dup_vma_private(struct vm_area_struct *vma);
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void clear_vma_resv_huge_pages(struct vm_area_struct *vma);
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int move_hugetlb_page_tables(struct vm_area_struct *vma,
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struct vm_area_struct *new_vma,
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unsigned long old_addr, unsigned long new_addr,
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unsigned long len);
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int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *,
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struct vm_area_struct *, struct vm_area_struct *);
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struct page *hugetlb_follow_page_mask(struct vm_area_struct *vma,
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unsigned long address, unsigned int flags);
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long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
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struct page **, unsigned long *, unsigned long *,
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long, unsigned int, int *);
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void unmap_hugepage_range(struct vm_area_struct *,
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unsigned long, unsigned long, struct page *,
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zap_flags_t);
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void __unmap_hugepage_range_final(struct mmu_gather *tlb,
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struct vm_area_struct *vma,
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unsigned long start, unsigned long end,
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struct page *ref_page, zap_flags_t zap_flags);
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void hugetlb_report_meminfo(struct seq_file *);
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int hugetlb_report_node_meminfo(char *buf, int len, int nid);
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void hugetlb_show_meminfo_node(int nid);
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unsigned long hugetlb_total_pages(void);
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vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
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unsigned long address, unsigned int flags);
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#ifdef CONFIG_USERFAULTFD
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int hugetlb_mfill_atomic_pte(pte_t *dst_pte,
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struct vm_area_struct *dst_vma,
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unsigned long dst_addr,
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unsigned long src_addr,
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uffd_flags_t flags,
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struct folio **foliop);
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#endif /* CONFIG_USERFAULTFD */
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bool hugetlb_reserve_pages(struct inode *inode, long from, long to,
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struct vm_area_struct *vma,
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vm_flags_t vm_flags);
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long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
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long freed);
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bool isolate_hugetlb(struct folio *folio, struct list_head *list);
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int get_hwpoison_hugetlb_folio(struct folio *folio, bool *hugetlb, bool unpoison);
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int get_huge_page_for_hwpoison(unsigned long pfn, int flags,
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bool *migratable_cleared);
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void folio_putback_active_hugetlb(struct folio *folio);
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void move_hugetlb_state(struct folio *old_folio, struct folio *new_folio, int reason);
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void free_huge_page(struct page *page);
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void hugetlb_fix_reserve_counts(struct inode *inode);
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extern struct mutex *hugetlb_fault_mutex_table;
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u32 hugetlb_fault_mutex_hash(struct address_space *mapping, pgoff_t idx);
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pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct *vma,
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unsigned long addr, pud_t *pud);
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struct address_space *hugetlb_page_mapping_lock_write(struct page *hpage);
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extern int sysctl_hugetlb_shm_group;
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extern struct list_head huge_boot_pages;
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/* arch callbacks */
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#ifndef CONFIG_HIGHPTE
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/*
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* pte_offset_huge() and pte_alloc_huge() are helpers for those architectures
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* which may go down to the lowest PTE level in their huge_pte_offset() and
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* huge_pte_alloc(): to avoid reliance on pte_offset_map() without pte_unmap().
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*/
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static inline pte_t *pte_offset_huge(pmd_t *pmd, unsigned long address)
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{
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return pte_offset_kernel(pmd, address);
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}
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static inline pte_t *pte_alloc_huge(struct mm_struct *mm, pmd_t *pmd,
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unsigned long address)
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{
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return pte_alloc(mm, pmd) ? NULL : pte_offset_huge(pmd, address);
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}
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#endif
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pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
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unsigned long addr, unsigned long sz);
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/*
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* huge_pte_offset(): Walk the hugetlb pgtable until the last level PTE.
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* Returns the pte_t* if found, or NULL if the address is not mapped.
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*
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* IMPORTANT: we should normally not directly call this function, instead
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* this is only a common interface to implement arch-specific
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* walker. Please use hugetlb_walk() instead, because that will attempt to
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* verify the locking for you.
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*
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* Since this function will walk all the pgtable pages (including not only
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* high-level pgtable page, but also PUD entry that can be unshared
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* concurrently for VM_SHARED), the caller of this function should be
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* responsible of its thread safety. One can follow this rule:
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*
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* (1) For private mappings: pmd unsharing is not possible, so holding the
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* mmap_lock for either read or write is sufficient. Most callers
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* already hold the mmap_lock, so normally, no special action is
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* required.
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*
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* (2) For shared mappings: pmd unsharing is possible (so the PUD-ranged
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* pgtable page can go away from under us! It can be done by a pmd
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* unshare with a follow up munmap() on the other process), then we
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* need either:
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*
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* (2.1) hugetlb vma lock read or write held, to make sure pmd unshare
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* won't happen upon the range (it also makes sure the pte_t we
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* read is the right and stable one), or,
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*
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* (2.2) hugetlb mapping i_mmap_rwsem lock held read or write, to make
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* sure even if unshare happened the racy unmap() will wait until
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* i_mmap_rwsem is released.
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*
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* Option (2.1) is the safest, which guarantees pte stability from pmd
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* sharing pov, until the vma lock released. Option (2.2) doesn't protect
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* a concurrent pmd unshare, but it makes sure the pgtable page is safe to
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* access.
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*/
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pte_t *huge_pte_offset(struct mm_struct *mm,
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unsigned long addr, unsigned long sz);
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unsigned long hugetlb_mask_last_page(struct hstate *h);
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int huge_pmd_unshare(struct mm_struct *mm, struct vm_area_struct *vma,
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unsigned long addr, pte_t *ptep);
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void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma,
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unsigned long *start, unsigned long *end);
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void hugetlb_vma_lock_read(struct vm_area_struct *vma);
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void hugetlb_vma_unlock_read(struct vm_area_struct *vma);
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void hugetlb_vma_lock_write(struct vm_area_struct *vma);
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void hugetlb_vma_unlock_write(struct vm_area_struct *vma);
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int hugetlb_vma_trylock_write(struct vm_area_struct *vma);
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void hugetlb_vma_assert_locked(struct vm_area_struct *vma);
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void hugetlb_vma_lock_release(struct kref *kref);
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int pmd_huge(pmd_t pmd);
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int pud_huge(pud_t pud);
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long hugetlb_change_protection(struct vm_area_struct *vma,
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unsigned long address, unsigned long end, pgprot_t newprot,
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unsigned long cp_flags);
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bool is_hugetlb_entry_migration(pte_t pte);
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void hugetlb_unshare_all_pmds(struct vm_area_struct *vma);
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#else /* !CONFIG_HUGETLB_PAGE */
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static inline void hugetlb_dup_vma_private(struct vm_area_struct *vma)
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{
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}
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static inline void clear_vma_resv_huge_pages(struct vm_area_struct *vma)
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{
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}
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static inline unsigned long hugetlb_total_pages(void)
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{
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return 0;
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}
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static inline struct address_space *hugetlb_page_mapping_lock_write(
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struct page *hpage)
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{
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return NULL;
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}
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static inline int huge_pmd_unshare(struct mm_struct *mm,
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struct vm_area_struct *vma,
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unsigned long addr, pte_t *ptep)
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{
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return 0;
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}
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static inline void adjust_range_if_pmd_sharing_possible(
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struct vm_area_struct *vma,
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unsigned long *start, unsigned long *end)
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{
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}
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static inline struct page *hugetlb_follow_page_mask(struct vm_area_struct *vma,
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unsigned long address, unsigned int flags)
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{
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BUILD_BUG(); /* should never be compiled in if !CONFIG_HUGETLB_PAGE*/
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}
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static inline long follow_hugetlb_page(struct mm_struct *mm,
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struct vm_area_struct *vma, struct page **pages,
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unsigned long *position, unsigned long *nr_pages,
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long i, unsigned int flags, int *nonblocking)
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{
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BUG();
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return 0;
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}
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static inline int copy_hugetlb_page_range(struct mm_struct *dst,
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struct mm_struct *src,
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struct vm_area_struct *dst_vma,
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struct vm_area_struct *src_vma)
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{
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BUG();
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return 0;
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}
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static inline int move_hugetlb_page_tables(struct vm_area_struct *vma,
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struct vm_area_struct *new_vma,
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unsigned long old_addr,
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unsigned long new_addr,
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unsigned long len)
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{
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BUG();
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return 0;
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}
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static inline void hugetlb_report_meminfo(struct seq_file *m)
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{
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}
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static inline int hugetlb_report_node_meminfo(char *buf, int len, int nid)
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{
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return 0;
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}
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static inline void hugetlb_show_meminfo_node(int nid)
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{
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}
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static inline int prepare_hugepage_range(struct file *file,
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unsigned long addr, unsigned long len)
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{
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return -EINVAL;
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}
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static inline void hugetlb_vma_lock_read(struct vm_area_struct *vma)
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{
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}
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static inline void hugetlb_vma_unlock_read(struct vm_area_struct *vma)
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{
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}
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static inline void hugetlb_vma_lock_write(struct vm_area_struct *vma)
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{
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}
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static inline void hugetlb_vma_unlock_write(struct vm_area_struct *vma)
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{
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}
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static inline int hugetlb_vma_trylock_write(struct vm_area_struct *vma)
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{
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return 1;
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}
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static inline void hugetlb_vma_assert_locked(struct vm_area_struct *vma)
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{
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}
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static inline int pmd_huge(pmd_t pmd)
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{
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return 0;
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}
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static inline int pud_huge(pud_t pud)
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{
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return 0;
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}
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static inline int is_hugepage_only_range(struct mm_struct *mm,
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unsigned long addr, unsigned long len)
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{
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return 0;
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}
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static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
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unsigned long addr, unsigned long end,
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unsigned long floor, unsigned long ceiling)
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{
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BUG();
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}
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#ifdef CONFIG_USERFAULTFD
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static inline int hugetlb_mfill_atomic_pte(pte_t *dst_pte,
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struct vm_area_struct *dst_vma,
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unsigned long dst_addr,
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unsigned long src_addr,
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uffd_flags_t flags,
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struct folio **foliop)
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{
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BUG();
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return 0;
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}
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#endif /* CONFIG_USERFAULTFD */
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static inline pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
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unsigned long sz)
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{
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return NULL;
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}
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static inline bool isolate_hugetlb(struct folio *folio, struct list_head *list)
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{
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return false;
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}
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static inline int get_hwpoison_hugetlb_folio(struct folio *folio, bool *hugetlb, bool unpoison)
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{
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return 0;
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}
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static inline int get_huge_page_for_hwpoison(unsigned long pfn, int flags,
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bool *migratable_cleared)
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{
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return 0;
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}
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static inline void folio_putback_active_hugetlb(struct folio *folio)
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{
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}
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static inline void move_hugetlb_state(struct folio *old_folio,
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struct folio *new_folio, int reason)
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{
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}
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static inline long hugetlb_change_protection(
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struct vm_area_struct *vma, unsigned long address,
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unsigned long end, pgprot_t newprot,
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unsigned long cp_flags)
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{
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return 0;
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}
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static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
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struct vm_area_struct *vma, unsigned long start,
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unsigned long end, struct page *ref_page,
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zap_flags_t zap_flags)
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{
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BUG();
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}
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static inline vm_fault_t hugetlb_fault(struct mm_struct *mm,
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struct vm_area_struct *vma, unsigned long address,
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unsigned int flags)
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{
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BUG();
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return 0;
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}
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static inline void hugetlb_unshare_all_pmds(struct vm_area_struct *vma) { }
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#endif /* !CONFIG_HUGETLB_PAGE */
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/*
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* hugepages at page global directory. If arch support
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* hugepages at pgd level, they need to define this.
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*/
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#ifndef pgd_huge
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#define pgd_huge(x) 0
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#endif
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#ifndef p4d_huge
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#define p4d_huge(x) 0
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#endif
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#ifndef pgd_write
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static inline int pgd_write(pgd_t pgd)
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{
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BUG();
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return 0;
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}
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#endif
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#define HUGETLB_ANON_FILE "anon_hugepage"
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enum {
|
|
/*
|
|
* The file will be used as an shm file so shmfs accounting rules
|
|
* apply
|
|
*/
|
|
HUGETLB_SHMFS_INODE = 1,
|
|
/*
|
|
* The file is being created on the internal vfs mount and shmfs
|
|
* accounting rules do not apply
|
|
*/
|
|
HUGETLB_ANONHUGE_INODE = 2,
|
|
};
|
|
|
|
#ifdef CONFIG_HUGETLBFS
|
|
struct hugetlbfs_sb_info {
|
|
long max_inodes; /* inodes allowed */
|
|
long free_inodes; /* inodes free */
|
|
spinlock_t stat_lock;
|
|
struct hstate *hstate;
|
|
struct hugepage_subpool *spool;
|
|
kuid_t uid;
|
|
kgid_t gid;
|
|
umode_t mode;
|
|
};
|
|
|
|
static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
|
|
{
|
|
return sb->s_fs_info;
|
|
}
|
|
|
|
struct hugetlbfs_inode_info {
|
|
struct shared_policy policy;
|
|
struct inode vfs_inode;
|
|
unsigned int seals;
|
|
};
|
|
|
|
static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
|
|
{
|
|
return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
|
|
}
|
|
|
|
extern const struct file_operations hugetlbfs_file_operations;
|
|
extern const struct vm_operations_struct hugetlb_vm_ops;
|
|
struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
|
|
int creat_flags, int page_size_log);
|
|
|
|
static inline bool is_file_hugepages(struct file *file)
|
|
{
|
|
if (file->f_op == &hugetlbfs_file_operations)
|
|
return true;
|
|
|
|
return is_file_shm_hugepages(file);
|
|
}
|
|
|
|
static inline struct hstate *hstate_inode(struct inode *i)
|
|
{
|
|
return HUGETLBFS_SB(i->i_sb)->hstate;
|
|
}
|
|
#else /* !CONFIG_HUGETLBFS */
|
|
|
|
#define is_file_hugepages(file) false
|
|
static inline struct file *
|
|
hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
|
|
int creat_flags, int page_size_log)
|
|
{
|
|
return ERR_PTR(-ENOSYS);
|
|
}
|
|
|
|
static inline struct hstate *hstate_inode(struct inode *i)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif /* !CONFIG_HUGETLBFS */
|
|
|
|
#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
|
|
unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
|
|
unsigned long len, unsigned long pgoff,
|
|
unsigned long flags);
|
|
#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
|
|
|
|
unsigned long
|
|
generic_hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
|
|
unsigned long len, unsigned long pgoff,
|
|
unsigned long flags);
|
|
|
|
/*
|
|
* huegtlb page specific state flags. These flags are located in page.private
|
|
* of the hugetlb head page. Functions created via the below macros should be
|
|
* used to manipulate these flags.
|
|
*
|
|
* HPG_restore_reserve - Set when a hugetlb page consumes a reservation at
|
|
* allocation time. Cleared when page is fully instantiated. Free
|
|
* routine checks flag to restore a reservation on error paths.
|
|
* Synchronization: Examined or modified by code that knows it has
|
|
* the only reference to page. i.e. After allocation but before use
|
|
* or when the page is being freed.
|
|
* HPG_migratable - Set after a newly allocated page is added to the page
|
|
* cache and/or page tables. Indicates the page is a candidate for
|
|
* migration.
|
|
* Synchronization: Initially set after new page allocation with no
|
|
* locking. When examined and modified during migration processing
|
|
* (isolate, migrate, putback) the hugetlb_lock is held.
|
|
* HPG_temporary - Set on a page that is temporarily allocated from the buddy
|
|
* allocator. Typically used for migration target pages when no pages
|
|
* are available in the pool. The hugetlb free page path will
|
|
* immediately free pages with this flag set to the buddy allocator.
|
|
* Synchronization: Can be set after huge page allocation from buddy when
|
|
* code knows it has only reference. All other examinations and
|
|
* modifications require hugetlb_lock.
|
|
* HPG_freed - Set when page is on the free lists.
|
|
* Synchronization: hugetlb_lock held for examination and modification.
|
|
* HPG_vmemmap_optimized - Set when the vmemmap pages of the page are freed.
|
|
* HPG_raw_hwp_unreliable - Set when the hugetlb page has a hwpoison sub-page
|
|
* that is not tracked by raw_hwp_page list.
|
|
*/
|
|
enum hugetlb_page_flags {
|
|
HPG_restore_reserve = 0,
|
|
HPG_migratable,
|
|
HPG_temporary,
|
|
HPG_freed,
|
|
HPG_vmemmap_optimized,
|
|
HPG_raw_hwp_unreliable,
|
|
__NR_HPAGEFLAGS,
|
|
};
|
|
|
|
/*
|
|
* Macros to create test, set and clear function definitions for
|
|
* hugetlb specific page flags.
|
|
*/
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
#define TESTHPAGEFLAG(uname, flname) \
|
|
static __always_inline \
|
|
bool folio_test_hugetlb_##flname(struct folio *folio) \
|
|
{ void *private = &folio->private; \
|
|
return test_bit(HPG_##flname, private); \
|
|
} \
|
|
static inline int HPage##uname(struct page *page) \
|
|
{ return test_bit(HPG_##flname, &(page->private)); }
|
|
|
|
#define SETHPAGEFLAG(uname, flname) \
|
|
static __always_inline \
|
|
void folio_set_hugetlb_##flname(struct folio *folio) \
|
|
{ void *private = &folio->private; \
|
|
set_bit(HPG_##flname, private); \
|
|
} \
|
|
static inline void SetHPage##uname(struct page *page) \
|
|
{ set_bit(HPG_##flname, &(page->private)); }
|
|
|
|
#define CLEARHPAGEFLAG(uname, flname) \
|
|
static __always_inline \
|
|
void folio_clear_hugetlb_##flname(struct folio *folio) \
|
|
{ void *private = &folio->private; \
|
|
clear_bit(HPG_##flname, private); \
|
|
} \
|
|
static inline void ClearHPage##uname(struct page *page) \
|
|
{ clear_bit(HPG_##flname, &(page->private)); }
|
|
#else
|
|
#define TESTHPAGEFLAG(uname, flname) \
|
|
static inline bool \
|
|
folio_test_hugetlb_##flname(struct folio *folio) \
|
|
{ return 0; } \
|
|
static inline int HPage##uname(struct page *page) \
|
|
{ return 0; }
|
|
|
|
#define SETHPAGEFLAG(uname, flname) \
|
|
static inline void \
|
|
folio_set_hugetlb_##flname(struct folio *folio) \
|
|
{ } \
|
|
static inline void SetHPage##uname(struct page *page) \
|
|
{ }
|
|
|
|
#define CLEARHPAGEFLAG(uname, flname) \
|
|
static inline void \
|
|
folio_clear_hugetlb_##flname(struct folio *folio) \
|
|
{ } \
|
|
static inline void ClearHPage##uname(struct page *page) \
|
|
{ }
|
|
#endif
|
|
|
|
#define HPAGEFLAG(uname, flname) \
|
|
TESTHPAGEFLAG(uname, flname) \
|
|
SETHPAGEFLAG(uname, flname) \
|
|
CLEARHPAGEFLAG(uname, flname) \
|
|
|
|
/*
|
|
* Create functions associated with hugetlb page flags
|
|
*/
|
|
HPAGEFLAG(RestoreReserve, restore_reserve)
|
|
HPAGEFLAG(Migratable, migratable)
|
|
HPAGEFLAG(Temporary, temporary)
|
|
HPAGEFLAG(Freed, freed)
|
|
HPAGEFLAG(VmemmapOptimized, vmemmap_optimized)
|
|
HPAGEFLAG(RawHwpUnreliable, raw_hwp_unreliable)
|
|
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
|
|
#define HSTATE_NAME_LEN 32
|
|
/* Defines one hugetlb page size */
|
|
struct hstate {
|
|
struct mutex resize_lock;
|
|
int next_nid_to_alloc;
|
|
int next_nid_to_free;
|
|
unsigned int order;
|
|
unsigned int demote_order;
|
|
unsigned long mask;
|
|
unsigned long max_huge_pages;
|
|
unsigned long nr_huge_pages;
|
|
unsigned long free_huge_pages;
|
|
unsigned long resv_huge_pages;
|
|
unsigned long surplus_huge_pages;
|
|
unsigned long nr_overcommit_huge_pages;
|
|
struct list_head hugepage_activelist;
|
|
struct list_head hugepage_freelists[MAX_NUMNODES];
|
|
unsigned int max_huge_pages_node[MAX_NUMNODES];
|
|
unsigned int nr_huge_pages_node[MAX_NUMNODES];
|
|
unsigned int free_huge_pages_node[MAX_NUMNODES];
|
|
unsigned int surplus_huge_pages_node[MAX_NUMNODES];
|
|
#ifdef CONFIG_CGROUP_HUGETLB
|
|
/* cgroup control files */
|
|
struct cftype cgroup_files_dfl[8];
|
|
struct cftype cgroup_files_legacy[10];
|
|
#endif
|
|
char name[HSTATE_NAME_LEN];
|
|
};
|
|
|
|
struct huge_bootmem_page {
|
|
struct list_head list;
|
|
struct hstate *hstate;
|
|
};
|
|
|
|
int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list);
|
|
struct folio *alloc_hugetlb_folio(struct vm_area_struct *vma,
|
|
unsigned long addr, int avoid_reserve);
|
|
struct folio *alloc_hugetlb_folio_nodemask(struct hstate *h, int preferred_nid,
|
|
nodemask_t *nmask, gfp_t gfp_mask);
|
|
struct folio *alloc_hugetlb_folio_vma(struct hstate *h, struct vm_area_struct *vma,
|
|
unsigned long address);
|
|
int hugetlb_add_to_page_cache(struct folio *folio, struct address_space *mapping,
|
|
pgoff_t idx);
|
|
void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
|
|
unsigned long address, struct folio *folio);
|
|
|
|
/* arch callback */
|
|
int __init __alloc_bootmem_huge_page(struct hstate *h, int nid);
|
|
int __init alloc_bootmem_huge_page(struct hstate *h, int nid);
|
|
bool __init hugetlb_node_alloc_supported(void);
|
|
|
|
void __init hugetlb_add_hstate(unsigned order);
|
|
bool __init arch_hugetlb_valid_size(unsigned long size);
|
|
struct hstate *size_to_hstate(unsigned long size);
|
|
|
|
#ifndef HUGE_MAX_HSTATE
|
|
#define HUGE_MAX_HSTATE 1
|
|
#endif
|
|
|
|
extern struct hstate hstates[HUGE_MAX_HSTATE];
|
|
extern unsigned int default_hstate_idx;
|
|
|
|
#define default_hstate (hstates[default_hstate_idx])
|
|
|
|
static inline struct hugepage_subpool *hugetlb_folio_subpool(struct folio *folio)
|
|
{
|
|
return folio->_hugetlb_subpool;
|
|
}
|
|
|
|
static inline void hugetlb_set_folio_subpool(struct folio *folio,
|
|
struct hugepage_subpool *subpool)
|
|
{
|
|
folio->_hugetlb_subpool = subpool;
|
|
}
|
|
|
|
static inline struct hstate *hstate_file(struct file *f)
|
|
{
|
|
return hstate_inode(file_inode(f));
|
|
}
|
|
|
|
static inline struct hstate *hstate_sizelog(int page_size_log)
|
|
{
|
|
if (!page_size_log)
|
|
return &default_hstate;
|
|
|
|
if (page_size_log < BITS_PER_LONG)
|
|
return size_to_hstate(1UL << page_size_log);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
|
|
{
|
|
return hstate_file(vma->vm_file);
|
|
}
|
|
|
|
static inline unsigned long huge_page_size(const struct hstate *h)
|
|
{
|
|
return (unsigned long)PAGE_SIZE << h->order;
|
|
}
|
|
|
|
extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
|
|
|
|
extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
|
|
|
|
static inline unsigned long huge_page_mask(struct hstate *h)
|
|
{
|
|
return h->mask;
|
|
}
|
|
|
|
static inline unsigned int huge_page_order(struct hstate *h)
|
|
{
|
|
return h->order;
|
|
}
|
|
|
|
static inline unsigned huge_page_shift(struct hstate *h)
|
|
{
|
|
return h->order + PAGE_SHIFT;
|
|
}
|
|
|
|
static inline bool hstate_is_gigantic(struct hstate *h)
|
|
{
|
|
return huge_page_order(h) > MAX_ORDER;
|
|
}
|
|
|
|
static inline unsigned int pages_per_huge_page(const struct hstate *h)
|
|
{
|
|
return 1 << h->order;
|
|
}
|
|
|
|
static inline unsigned int blocks_per_huge_page(struct hstate *h)
|
|
{
|
|
return huge_page_size(h) / 512;
|
|
}
|
|
|
|
#include <asm/hugetlb.h>
|
|
|
|
#ifndef is_hugepage_only_range
|
|
static inline int is_hugepage_only_range(struct mm_struct *mm,
|
|
unsigned long addr, unsigned long len)
|
|
{
|
|
return 0;
|
|
}
|
|
#define is_hugepage_only_range is_hugepage_only_range
|
|
#endif
|
|
|
|
#ifndef arch_clear_hugepage_flags
|
|
static inline void arch_clear_hugepage_flags(struct page *page) { }
|
|
#define arch_clear_hugepage_flags arch_clear_hugepage_flags
|
|
#endif
|
|
|
|
#ifndef arch_make_huge_pte
|
|
static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift,
|
|
vm_flags_t flags)
|
|
{
|
|
return pte_mkhuge(entry);
|
|
}
|
|
#endif
|
|
|
|
static inline struct hstate *folio_hstate(struct folio *folio)
|
|
{
|
|
VM_BUG_ON_FOLIO(!folio_test_hugetlb(folio), folio);
|
|
return size_to_hstate(folio_size(folio));
|
|
}
|
|
|
|
static inline struct hstate *page_hstate(struct page *page)
|
|
{
|
|
return folio_hstate(page_folio(page));
|
|
}
|
|
|
|
static inline unsigned hstate_index_to_shift(unsigned index)
|
|
{
|
|
return hstates[index].order + PAGE_SHIFT;
|
|
}
|
|
|
|
static inline int hstate_index(struct hstate *h)
|
|
{
|
|
return h - hstates;
|
|
}
|
|
|
|
extern int dissolve_free_huge_page(struct page *page);
|
|
extern int dissolve_free_huge_pages(unsigned long start_pfn,
|
|
unsigned long end_pfn);
|
|
|
|
#ifdef CONFIG_MEMORY_FAILURE
|
|
extern void folio_clear_hugetlb_hwpoison(struct folio *folio);
|
|
#else
|
|
static inline void folio_clear_hugetlb_hwpoison(struct folio *folio)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
|
|
#ifndef arch_hugetlb_migration_supported
|
|
static inline bool arch_hugetlb_migration_supported(struct hstate *h)
|
|
{
|
|
if ((huge_page_shift(h) == PMD_SHIFT) ||
|
|
(huge_page_shift(h) == PUD_SHIFT) ||
|
|
(huge_page_shift(h) == PGDIR_SHIFT))
|
|
return true;
|
|
else
|
|
return false;
|
|
}
|
|
#endif
|
|
#else
|
|
static inline bool arch_hugetlb_migration_supported(struct hstate *h)
|
|
{
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
static inline bool hugepage_migration_supported(struct hstate *h)
|
|
{
|
|
return arch_hugetlb_migration_supported(h);
|
|
}
|
|
|
|
/*
|
|
* Movability check is different as compared to migration check.
|
|
* It determines whether or not a huge page should be placed on
|
|
* movable zone or not. Movability of any huge page should be
|
|
* required only if huge page size is supported for migration.
|
|
* There won't be any reason for the huge page to be movable if
|
|
* it is not migratable to start with. Also the size of the huge
|
|
* page should be large enough to be placed under a movable zone
|
|
* and still feasible enough to be migratable. Just the presence
|
|
* in movable zone does not make the migration feasible.
|
|
*
|
|
* So even though large huge page sizes like the gigantic ones
|
|
* are migratable they should not be movable because its not
|
|
* feasible to migrate them from movable zone.
|
|
*/
|
|
static inline bool hugepage_movable_supported(struct hstate *h)
|
|
{
|
|
if (!hugepage_migration_supported(h))
|
|
return false;
|
|
|
|
if (hstate_is_gigantic(h))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/* Movability of hugepages depends on migration support. */
|
|
static inline gfp_t htlb_alloc_mask(struct hstate *h)
|
|
{
|
|
if (hugepage_movable_supported(h))
|
|
return GFP_HIGHUSER_MOVABLE;
|
|
else
|
|
return GFP_HIGHUSER;
|
|
}
|
|
|
|
static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask)
|
|
{
|
|
gfp_t modified_mask = htlb_alloc_mask(h);
|
|
|
|
/* Some callers might want to enforce node */
|
|
modified_mask |= (gfp_mask & __GFP_THISNODE);
|
|
|
|
modified_mask |= (gfp_mask & __GFP_NOWARN);
|
|
|
|
return modified_mask;
|
|
}
|
|
|
|
static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
|
|
struct mm_struct *mm, pte_t *pte)
|
|
{
|
|
if (huge_page_size(h) == PMD_SIZE)
|
|
return pmd_lockptr(mm, (pmd_t *) pte);
|
|
VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
|
|
return &mm->page_table_lock;
|
|
}
|
|
|
|
#ifndef hugepages_supported
|
|
/*
|
|
* Some platform decide whether they support huge pages at boot
|
|
* time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
|
|
* when there is no such support
|
|
*/
|
|
#define hugepages_supported() (HPAGE_SHIFT != 0)
|
|
#endif
|
|
|
|
void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
|
|
|
|
static inline void hugetlb_count_init(struct mm_struct *mm)
|
|
{
|
|
atomic_long_set(&mm->hugetlb_usage, 0);
|
|
}
|
|
|
|
static inline void hugetlb_count_add(long l, struct mm_struct *mm)
|
|
{
|
|
atomic_long_add(l, &mm->hugetlb_usage);
|
|
}
|
|
|
|
static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
|
|
{
|
|
atomic_long_sub(l, &mm->hugetlb_usage);
|
|
}
|
|
|
|
#ifndef huge_ptep_modify_prot_start
|
|
#define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
|
|
static inline pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
|
|
unsigned long addr, pte_t *ptep)
|
|
{
|
|
return huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
|
|
}
|
|
#endif
|
|
|
|
#ifndef huge_ptep_modify_prot_commit
|
|
#define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit
|
|
static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
|
|
unsigned long addr, pte_t *ptep,
|
|
pte_t old_pte, pte_t pte)
|
|
{
|
|
set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_NUMA
|
|
void hugetlb_register_node(struct node *node);
|
|
void hugetlb_unregister_node(struct node *node);
|
|
#endif
|
|
|
|
#else /* CONFIG_HUGETLB_PAGE */
|
|
struct hstate {};
|
|
|
|
static inline struct hugepage_subpool *hugetlb_folio_subpool(struct folio *folio)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline int isolate_or_dissolve_huge_page(struct page *page,
|
|
struct list_head *list)
|
|
{
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static inline struct folio *alloc_hugetlb_folio(struct vm_area_struct *vma,
|
|
unsigned long addr,
|
|
int avoid_reserve)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct folio *
|
|
alloc_hugetlb_folio_nodemask(struct hstate *h, int preferred_nid,
|
|
nodemask_t *nmask, gfp_t gfp_mask)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct folio *alloc_hugetlb_folio_vma(struct hstate *h,
|
|
struct vm_area_struct *vma,
|
|
unsigned long address)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline int __alloc_bootmem_huge_page(struct hstate *h)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline struct hstate *hstate_file(struct file *f)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct hstate *hstate_sizelog(int page_size_log)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct hstate *folio_hstate(struct folio *folio)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct hstate *page_hstate(struct page *page)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct hstate *size_to_hstate(unsigned long size)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline unsigned long huge_page_size(struct hstate *h)
|
|
{
|
|
return PAGE_SIZE;
|
|
}
|
|
|
|
static inline unsigned long huge_page_mask(struct hstate *h)
|
|
{
|
|
return PAGE_MASK;
|
|
}
|
|
|
|
static inline unsigned long vma_kernel_pagesize(struct vm_area_struct *vma)
|
|
{
|
|
return PAGE_SIZE;
|
|
}
|
|
|
|
static inline unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
|
|
{
|
|
return PAGE_SIZE;
|
|
}
|
|
|
|
static inline unsigned int huge_page_order(struct hstate *h)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline unsigned int huge_page_shift(struct hstate *h)
|
|
{
|
|
return PAGE_SHIFT;
|
|
}
|
|
|
|
static inline bool hstate_is_gigantic(struct hstate *h)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline unsigned int pages_per_huge_page(struct hstate *h)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static inline unsigned hstate_index_to_shift(unsigned index)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int hstate_index(struct hstate *h)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int dissolve_free_huge_page(struct page *page)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int dissolve_free_huge_pages(unsigned long start_pfn,
|
|
unsigned long end_pfn)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline bool hugepage_migration_supported(struct hstate *h)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool hugepage_movable_supported(struct hstate *h)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline gfp_t htlb_alloc_mask(struct hstate *h)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
|
|
struct mm_struct *mm, pte_t *pte)
|
|
{
|
|
return &mm->page_table_lock;
|
|
}
|
|
|
|
static inline void hugetlb_count_init(struct mm_struct *mm)
|
|
{
|
|
}
|
|
|
|
static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
|
|
{
|
|
}
|
|
|
|
static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
|
|
{
|
|
}
|
|
|
|
static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
|
|
unsigned long addr, pte_t *ptep)
|
|
{
|
|
#ifdef CONFIG_MMU
|
|
return ptep_get(ptep);
|
|
#else
|
|
return *ptep;
|
|
#endif
|
|
}
|
|
|
|
static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
|
|
pte_t *ptep, pte_t pte)
|
|
{
|
|
}
|
|
|
|
static inline void hugetlb_register_node(struct node *node)
|
|
{
|
|
}
|
|
|
|
static inline void hugetlb_unregister_node(struct node *node)
|
|
{
|
|
}
|
|
#endif /* CONFIG_HUGETLB_PAGE */
|
|
|
|
static inline spinlock_t *huge_pte_lock(struct hstate *h,
|
|
struct mm_struct *mm, pte_t *pte)
|
|
{
|
|
spinlock_t *ptl;
|
|
|
|
ptl = huge_pte_lockptr(h, mm, pte);
|
|
spin_lock(ptl);
|
|
return ptl;
|
|
}
|
|
|
|
#if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_CMA)
|
|
extern void __init hugetlb_cma_reserve(int order);
|
|
#else
|
|
static inline __init void hugetlb_cma_reserve(int order)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
|
|
static inline bool hugetlb_pmd_shared(pte_t *pte)
|
|
{
|
|
return page_count(virt_to_page(pte)) > 1;
|
|
}
|
|
#else
|
|
static inline bool hugetlb_pmd_shared(pte_t *pte)
|
|
{
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
bool want_pmd_share(struct vm_area_struct *vma, unsigned long addr);
|
|
|
|
#ifndef __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE
|
|
/*
|
|
* ARCHes with special requirements for evicting HUGETLB backing TLB entries can
|
|
* implement this.
|
|
*/
|
|
#define flush_hugetlb_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end)
|
|
#endif
|
|
|
|
static inline bool __vma_shareable_lock(struct vm_area_struct *vma)
|
|
{
|
|
return (vma->vm_flags & VM_MAYSHARE) && vma->vm_private_data;
|
|
}
|
|
|
|
/*
|
|
* Safe version of huge_pte_offset() to check the locks. See comments
|
|
* above huge_pte_offset().
|
|
*/
|
|
static inline pte_t *
|
|
hugetlb_walk(struct vm_area_struct *vma, unsigned long addr, unsigned long sz)
|
|
{
|
|
#if defined(CONFIG_HUGETLB_PAGE) && \
|
|
defined(CONFIG_ARCH_WANT_HUGE_PMD_SHARE) && defined(CONFIG_LOCKDEP)
|
|
struct hugetlb_vma_lock *vma_lock = vma->vm_private_data;
|
|
|
|
/*
|
|
* If pmd sharing possible, locking needed to safely walk the
|
|
* hugetlb pgtables. More information can be found at the comment
|
|
* above huge_pte_offset() in the same file.
|
|
*
|
|
* NOTE: lockdep_is_held() is only defined with CONFIG_LOCKDEP.
|
|
*/
|
|
if (__vma_shareable_lock(vma))
|
|
WARN_ON_ONCE(!lockdep_is_held(&vma_lock->rw_sema) &&
|
|
!lockdep_is_held(
|
|
&vma->vm_file->f_mapping->i_mmap_rwsem));
|
|
#endif
|
|
return huge_pte_offset(vma->vm_mm, addr, sz);
|
|
}
|
|
|
|
#endif /* _LINUX_HUGETLB_H */
|