diff options
Diffstat (limited to 'include/linux/huge_mm.h')
| -rw-r--r-- | include/linux/huge_mm.h | 464 |
1 files changed, 464 insertions, 0 deletions
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h new file mode 100644 index 000000000..a1341fdcf --- /dev/null +++ b/include/linux/huge_mm.h @@ -0,0 +1,464 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_HUGE_MM_H +#define _LINUX_HUGE_MM_H + +#include <linux/sched/coredump.h> +#include <linux/mm_types.h> + +#include <linux/fs.h> /* only for vma_is_dax() */ + +vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf); +int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm, + pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr, + struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma); +void huge_pmd_set_accessed(struct vm_fault *vmf); +int copy_huge_pud(struct mm_struct *dst_mm, struct mm_struct *src_mm, + pud_t *dst_pud, pud_t *src_pud, unsigned long addr, + struct vm_area_struct *vma); + +#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD +void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud); +#else +static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud) +{ +} +#endif + +vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf); +struct page *follow_trans_huge_pmd(struct vm_area_struct *vma, + unsigned long addr, pmd_t *pmd, + unsigned int flags); +bool madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, + pmd_t *pmd, unsigned long addr, unsigned long next); +int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, pmd_t *pmd, + unsigned long addr); +int zap_huge_pud(struct mmu_gather *tlb, struct vm_area_struct *vma, pud_t *pud, + unsigned long addr); +bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr, + unsigned long new_addr, pmd_t *old_pmd, pmd_t *new_pmd); +int change_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, + pmd_t *pmd, unsigned long addr, pgprot_t newprot, + unsigned long cp_flags); +vm_fault_t vmf_insert_pfn_pmd_prot(struct vm_fault *vmf, pfn_t pfn, + pgprot_t pgprot, bool write); + +/** + * vmf_insert_pfn_pmd - insert a pmd size pfn + * @vmf: Structure describing the fault + * @pfn: pfn to insert + * @pgprot: page protection to use + * @write: whether it's a write fault + * + * Insert a pmd size pfn. See vmf_insert_pfn() for additional info. + * + * Return: vm_fault_t value. + */ +static inline vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, + bool write) +{ + return vmf_insert_pfn_pmd_prot(vmf, pfn, vmf->vma->vm_page_prot, write); +} +vm_fault_t vmf_insert_pfn_pud_prot(struct vm_fault *vmf, pfn_t pfn, + pgprot_t pgprot, bool write); + +/** + * vmf_insert_pfn_pud - insert a pud size pfn + * @vmf: Structure describing the fault + * @pfn: pfn to insert + * @pgprot: page protection to use + * @write: whether it's a write fault + * + * Insert a pud size pfn. See vmf_insert_pfn() for additional info. + * + * Return: vm_fault_t value. + */ +static inline vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, + bool write) +{ + return vmf_insert_pfn_pud_prot(vmf, pfn, vmf->vma->vm_page_prot, write); +} + +enum transparent_hugepage_flag { + TRANSPARENT_HUGEPAGE_NEVER_DAX, + TRANSPARENT_HUGEPAGE_FLAG, + TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG, + TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG, + TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG, + TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG, + TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, + TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG, + TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG, +}; + +struct kobject; +struct kobj_attribute; + +ssize_t single_hugepage_flag_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count, + enum transparent_hugepage_flag flag); +ssize_t single_hugepage_flag_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf, + enum transparent_hugepage_flag flag); +extern struct kobj_attribute shmem_enabled_attr; + +#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT) +#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER) + +#ifdef CONFIG_TRANSPARENT_HUGEPAGE +#define HPAGE_PMD_SHIFT PMD_SHIFT +#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT) +#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1)) + +#define HPAGE_PUD_SHIFT PUD_SHIFT +#define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT) +#define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1)) + +extern unsigned long transparent_hugepage_flags; + +#define hugepage_flags_enabled() \ + (transparent_hugepage_flags & \ + ((1<<TRANSPARENT_HUGEPAGE_FLAG) | \ + (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))) +#define hugepage_flags_always() \ + (transparent_hugepage_flags & \ + (1<<TRANSPARENT_HUGEPAGE_FLAG)) + +/* + * Do the below checks: + * - For file vma, check if the linear page offset of vma is + * HPAGE_PMD_NR aligned within the file. The hugepage is + * guaranteed to be hugepage-aligned within the file, but we must + * check that the PMD-aligned addresses in the VMA map to + * PMD-aligned offsets within the file, else the hugepage will + * not be PMD-mappable. + * - For all vmas, check if the haddr is in an aligned HPAGE_PMD_SIZE + * area. + */ +static inline bool transhuge_vma_suitable(struct vm_area_struct *vma, + unsigned long addr) +{ + unsigned long haddr; + + /* Don't have to check pgoff for anonymous vma */ + if (!vma_is_anonymous(vma)) { + if (!IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff, + HPAGE_PMD_NR)) + return false; + } + + haddr = addr & HPAGE_PMD_MASK; + + if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end) + return false; + return true; +} + +static inline bool file_thp_enabled(struct vm_area_struct *vma) +{ + struct inode *inode; + + if (!vma->vm_file) + return false; + + inode = vma->vm_file->f_inode; + + return (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS)) && + (vma->vm_flags & VM_EXEC) && + !inode_is_open_for_write(inode) && S_ISREG(inode->i_mode); +} + +bool hugepage_vma_check(struct vm_area_struct *vma, unsigned long vm_flags, + bool smaps, bool in_pf, bool enforce_sysfs); + +#define transparent_hugepage_use_zero_page() \ + (transparent_hugepage_flags & \ + (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG)) + +unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr, + unsigned long len, unsigned long pgoff, unsigned long flags); + +void prep_transhuge_page(struct page *page); +void free_transhuge_page(struct page *page); + +bool can_split_folio(struct folio *folio, int *pextra_pins); +int split_huge_page_to_list(struct page *page, struct list_head *list); +static inline int split_huge_page(struct page *page) +{ + return split_huge_page_to_list(page, NULL); +} +void deferred_split_huge_page(struct page *page); + +void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, + unsigned long address, bool freeze, struct folio *folio); + +#define split_huge_pmd(__vma, __pmd, __address) \ + do { \ + pmd_t *____pmd = (__pmd); \ + if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \ + || pmd_devmap(*____pmd)) \ + __split_huge_pmd(__vma, __pmd, __address, \ + false, NULL); \ + } while (0) + + +void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address, + bool freeze, struct folio *folio); + +void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud, + unsigned long address); + +#define split_huge_pud(__vma, __pud, __address) \ + do { \ + pud_t *____pud = (__pud); \ + if (pud_trans_huge(*____pud) \ + || pud_devmap(*____pud)) \ + __split_huge_pud(__vma, __pud, __address); \ + } while (0) + +int hugepage_madvise(struct vm_area_struct *vma, unsigned long *vm_flags, + int advice); +int madvise_collapse(struct vm_area_struct *vma, + struct vm_area_struct **prev, + unsigned long start, unsigned long end); +void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start, + unsigned long end, long adjust_next); +spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma); +spinlock_t *__pud_trans_huge_lock(pud_t *pud, struct vm_area_struct *vma); + +static inline int is_swap_pmd(pmd_t pmd) +{ + return !pmd_none(pmd) && !pmd_present(pmd); +} + +/* mmap_lock must be held on entry */ +static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd, + struct vm_area_struct *vma) +{ + if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd)) + return __pmd_trans_huge_lock(pmd, vma); + else + return NULL; +} +static inline spinlock_t *pud_trans_huge_lock(pud_t *pud, + struct vm_area_struct *vma) +{ + if (pud_trans_huge(*pud) || pud_devmap(*pud)) + return __pud_trans_huge_lock(pud, vma); + else + return NULL; +} + +/** + * folio_test_pmd_mappable - Can we map this folio with a PMD? + * @folio: The folio to test + */ +static inline bool folio_test_pmd_mappable(struct folio *folio) +{ + return folio_order(folio) >= HPAGE_PMD_ORDER; +} + +struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr, + pmd_t *pmd, int flags, struct dev_pagemap **pgmap); +struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr, + pud_t *pud, int flags, struct dev_pagemap **pgmap); + +vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf); + +extern struct page *huge_zero_page; +extern unsigned long huge_zero_pfn; + +static inline bool is_huge_zero_page(struct page *page) +{ + return READ_ONCE(huge_zero_page) == page; +} + +static inline bool is_huge_zero_pmd(pmd_t pmd) +{ + return pmd_present(pmd) && READ_ONCE(huge_zero_pfn) == pmd_pfn(pmd); +} + +static inline bool is_huge_zero_pud(pud_t pud) +{ + return false; +} + +struct page *mm_get_huge_zero_page(struct mm_struct *mm); +void mm_put_huge_zero_page(struct mm_struct *mm); + +#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot)) + +static inline bool thp_migration_supported(void) +{ + return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION); +} + +static inline struct list_head *page_deferred_list(struct page *page) +{ + /* + * See organization of tail pages of compound page in + * "struct page" definition. + */ + return &page[2].deferred_list; +} + +#else /* CONFIG_TRANSPARENT_HUGEPAGE */ +#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) +#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; }) +#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; }) + +#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; }) +#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; }) +#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; }) + +static inline bool folio_test_pmd_mappable(struct folio *folio) +{ + return false; +} + +static inline bool transhuge_vma_suitable(struct vm_area_struct *vma, + unsigned long addr) +{ + return false; +} + +static inline bool hugepage_vma_check(struct vm_area_struct *vma, + unsigned long vm_flags, bool smaps, + bool in_pf, bool enforce_sysfs) +{ + return false; +} + +static inline void prep_transhuge_page(struct page *page) {} + +#define transparent_hugepage_flags 0UL + +#define thp_get_unmapped_area NULL + +static inline bool +can_split_folio(struct folio *folio, int *pextra_pins) +{ + return false; +} +static inline int +split_huge_page_to_list(struct page *page, struct list_head *list) +{ + return 0; +} +static inline int split_huge_page(struct page *page) +{ + return 0; +} +static inline void deferred_split_huge_page(struct page *page) {} +#define split_huge_pmd(__vma, __pmd, __address) \ + do { } while (0) + +static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, + unsigned long address, bool freeze, struct folio *folio) {} +static inline void split_huge_pmd_address(struct vm_area_struct *vma, + unsigned long address, bool freeze, struct folio *folio) {} + +#define split_huge_pud(__vma, __pmd, __address) \ + do { } while (0) + +static inline int hugepage_madvise(struct vm_area_struct *vma, + unsigned long *vm_flags, int advice) +{ + return -EINVAL; +} + +static inline int madvise_collapse(struct vm_area_struct *vma, + struct vm_area_struct **prev, + unsigned long start, unsigned long end) +{ + return -EINVAL; +} + +static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, + unsigned long start, + unsigned long end, + long adjust_next) +{ +} +static inline int is_swap_pmd(pmd_t pmd) +{ + return 0; +} +static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd, + struct vm_area_struct *vma) +{ + return NULL; +} +static inline spinlock_t *pud_trans_huge_lock(pud_t *pud, + struct vm_area_struct *vma) +{ + return NULL; +} + +static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf) +{ + return 0; +} + +static inline bool is_huge_zero_page(struct page *page) +{ + return false; +} + +static inline bool is_huge_zero_pmd(pmd_t pmd) +{ + return false; +} + +static inline bool is_huge_zero_pud(pud_t pud) +{ + return false; +} + +static inline void mm_put_huge_zero_page(struct mm_struct *mm) +{ + return; +} + +static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma, + unsigned long addr, pmd_t *pmd, int flags, struct dev_pagemap **pgmap) +{ + return NULL; +} + +static inline struct page *follow_devmap_pud(struct vm_area_struct *vma, + unsigned long addr, pud_t *pud, int flags, struct dev_pagemap **pgmap) +{ + return NULL; +} + +static inline bool thp_migration_supported(void) +{ + return false; +} +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ + +static inline int split_folio_to_list(struct folio *folio, + struct list_head *list) +{ + return split_huge_page_to_list(&folio->page, list); +} + +static inline int split_folio(struct folio *folio) +{ + return split_folio_to_list(folio, NULL); +} + +/* + * archs that select ARCH_WANTS_THP_SWAP but don't support THP_SWP due to + * limitations in the implementation like arm64 MTE can override this to + * false + */ +#ifndef arch_thp_swp_supported +static inline bool arch_thp_swp_supported(void) +{ + return true; +} +#endif + +#endif /* _LINUX_HUGE_MM_H */ |