hugetlb.h 16.8 KB
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_HUGETLB_H
#define _LINUX_HUGETLB_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/list.h>
#include <linux/kref.h>
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#include <asm/pgtable.h>
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struct ctl_table;
struct user_struct;
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struct mmu_gather;
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#ifndef is_hugepd
/*
 * Some architectures requires a hugepage directory format that is
 * required to support multiple hugepage sizes. For example
 * a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables"
 * introduced the same on powerpc. This allows for a more flexible hugepage
 * pagetable layout.
 */
typedef struct { unsigned long pd; } hugepd_t;
#define is_hugepd(hugepd) (0)
#define __hugepd(x) ((hugepd_t) { (x) })
static inline int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
			      unsigned pdshift, unsigned long end,
			      int write, struct page **pages, int *nr)
{
	return 0;
}
#else
extern int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
		       unsigned pdshift, unsigned long end,
		       int write, struct page **pages, int *nr);
#endif


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#ifdef CONFIG_HUGETLB_PAGE

#include <linux/mempolicy.h>
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#include <linux/shm.h>
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#include <asm/tlbflush.h>
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struct hugepage_subpool {
	spinlock_t lock;
	long count;
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	long max_hpages;	/* Maximum huge pages or -1 if no maximum. */
	long used_hpages;	/* Used count against maximum, includes */
				/* both alloced and reserved pages. */
	struct hstate *hstate;
	long min_hpages;	/* Minimum huge pages or -1 if no minimum. */
	long rsv_hpages;	/* Pages reserved against global pool to */
				/* sasitfy minimum size. */
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};

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struct resv_map {
	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;
	struct list_head region_cache;
	long region_cache_count;
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};
extern struct resv_map *resv_map_alloc(void);
void resv_map_release(struct kref *ref);

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extern spinlock_t hugetlb_lock;
extern int hugetlb_max_hstate __read_mostly;
#define for_each_hstate(h) \
	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,
						long min_hpages);
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void hugepage_put_subpool(struct hugepage_subpool *spool);

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void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
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int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
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#ifdef CONFIG_NUMA
int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
					void __user *, size_t *, loff_t *);
#endif

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int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
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long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
			 struct page **, struct vm_area_struct **,
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			 unsigned long *, unsigned long *, 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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void __unmap_hugepage_range_final(struct mmu_gather *tlb,
			  struct vm_area_struct *vma,
			  unsigned long start, unsigned long end,
			  struct page *ref_page);
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void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
				unsigned long start, unsigned long end,
				struct page *ref_page);
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void hugetlb_report_meminfo(struct seq_file *);
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int hugetlb_report_node_meminfo(int, char *);
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void hugetlb_show_meminfo(void);
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unsigned long hugetlb_total_pages(void);
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int 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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int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte,
				struct vm_area_struct *dst_vma,
				unsigned long dst_addr,
				unsigned long src_addr,
				struct page **pagep);
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int 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,
						long freed);
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bool isolate_huge_page(struct page *page, struct list_head *list);
void putback_active_hugepage(struct page *page);
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void move_hugetlb_state(struct page *oldpage, struct page *newpage, 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;
u32 hugetlb_fault_mutex_hash(struct hstate *h, struct mm_struct *mm,
				struct vm_area_struct *vma,
				struct address_space *mapping,
				pgoff_t idx, unsigned long address);
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pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);

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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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pte_t *huge_pte_alloc(struct mm_struct *mm,
			unsigned long addr, unsigned long sz);
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pte_t *huge_pte_offset(struct mm_struct *mm,
		       unsigned long addr, unsigned long sz);
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int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
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struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
			      int write);
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struct page *follow_huge_pd(struct vm_area_struct *vma,
			    unsigned long address, hugepd_t hpd,
			    int flags, int pdshift);
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struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
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				pmd_t *pmd, int flags);
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struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
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				pud_t *pud, int flags);
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struct page *follow_huge_pgd(struct mm_struct *mm, unsigned long address,
			     pgd_t *pgd, int flags);

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int pmd_huge(pmd_t pmd);
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int pud_huge(pud_t pud);
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unsigned 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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bool is_hugetlb_entry_migration(pte_t pte);
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#else /* !CONFIG_HUGETLB_PAGE */

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static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
{
}

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static inline unsigned long hugetlb_total_pages(void)
{
	return 0;
}

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#define follow_hugetlb_page(m,v,p,vs,a,b,i,w,n)	({ BUG(); 0; })
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#define follow_huge_addr(mm, addr, write)	ERR_PTR(-EINVAL)
#define copy_hugetlb_page_range(src, dst, vma)	({ BUG(); 0; })
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static inline void hugetlb_report_meminfo(struct seq_file *m)
{
}
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#define hugetlb_report_node_meminfo(n, buf)	0
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static inline void hugetlb_show_meminfo(void)
{
}
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#define follow_huge_pd(vma, addr, hpd, flags, pdshift) NULL
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#define follow_huge_pmd(mm, addr, pmd, flags)	NULL
#define follow_huge_pud(mm, addr, pud, flags)	NULL
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#define follow_huge_pgd(mm, addr, pgd, flags)	NULL
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#define prepare_hugepage_range(file, addr, len)	(-EINVAL)
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#define pmd_huge(x)	0
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#define pud_huge(x)	0
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#define is_hugepage_only_range(mm, addr, len)	0
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#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
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#define hugetlb_fault(mm, vma, addr, flags)	({ BUG(); 0; })
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#define hugetlb_mcopy_atomic_pte(dst_mm, dst_pte, dst_vma, dst_addr, \
				src_addr, pagep)	({ BUG(); 0; })
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#define huge_pte_offset(mm, address, sz)	0
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static inline bool isolate_huge_page(struct page *page, struct list_head *list)
{
	return false;
}
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#define putback_active_hugepage(p)	do {} while (0)
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#define move_hugetlb_state(old, new, reason)	do {} while (0)
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static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
		unsigned long address, unsigned long end, pgprot_t newprot)
{
	return 0;
}
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static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
			struct vm_area_struct *vma, unsigned long start,
			unsigned long end, struct page *ref_page)
{
	BUG();
}

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static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
			struct vm_area_struct *vma, unsigned long start,
			unsigned long end, struct page *ref_page)
{
	BUG();
}

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#endif /* !CONFIG_HUGETLB_PAGE */
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/*
 * hugepages at page global directory. If arch support
 * hugepages at pgd level, they need to define this.
 */
#ifndef pgd_huge
#define pgd_huge(x)	0
#endif
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#ifndef p4d_huge
#define p4d_huge(x)	0
#endif
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#ifndef pgd_write
static inline int pgd_write(pgd_t pgd)
{
	BUG();
	return 0;
}
#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,
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	/*
	 * The file is being created on the internal vfs mount and shmfs
	 * accounting rules do not apply
	 */
	HUGETLB_ANONHUGE_INODE  = 2,
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};

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#ifdef CONFIG_HUGETLBFS
struct hugetlbfs_sb_info {
	long	max_inodes;   /* inodes allowed */
	long	free_inodes;  /* inodes free */
	spinlock_t	stat_lock;
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	struct hstate *hstate;
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	struct hugepage_subpool *spool;
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	kuid_t	uid;
	kgid_t	gid;
	umode_t mode;
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};

static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
{
	return sb->s_fs_info;
}

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struct hugetlbfs_inode_info {
	struct shared_policy policy;
	struct inode vfs_inode;
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	unsigned int seals;
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};

static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
{
	return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
}

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extern const struct file_operations hugetlbfs_file_operations;
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extern const struct vm_operations_struct hugetlb_vm_ops;
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struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
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				struct user_struct **user, int creat_flags,
				int page_size_log);
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static inline bool is_file_hugepages(struct file *file)
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{
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	if (file->f_op == &hugetlbfs_file_operations)
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		return true;
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	return is_file_shm_hugepages(file);
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}

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#else /* !CONFIG_HUGETLBFS */

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#define is_file_hugepages(file)			false
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static inline struct file *
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hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
		struct user_struct **user, int creat_flags,
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		int page_size_log)
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{
	return ERR_PTR(-ENOSYS);
}
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#endif /* !CONFIG_HUGETLBFS */

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#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 */

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#ifdef CONFIG_HUGETLB_PAGE

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#define HSTATE_NAME_LEN 32
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/* Defines one hugetlb page size */
struct hstate {
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	int next_nid_to_alloc;
	int next_nid_to_free;
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	unsigned int 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;
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	struct list_head hugepage_activelist;
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	struct list_head hugepage_freelists[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];
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#ifdef CONFIG_CGROUP_HUGETLB
	/* cgroup control files */
	struct cftype cgroup_files[5];
#endif
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	char name[HSTATE_NAME_LEN];
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};

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struct huge_bootmem_page {
	struct list_head list;
	struct hstate *hstate;
};

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struct page *alloc_huge_page(struct vm_area_struct *vma,
				unsigned long addr, int avoid_reserve);
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struct page *alloc_huge_page_node(struct hstate *h, int nid);
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struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
				nodemask_t *nmask);
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struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
				unsigned long address);
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int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
			pgoff_t idx);
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/* arch callback */
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int __init __alloc_bootmem_huge_page(struct hstate *h);
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int __init alloc_bootmem_huge_page(struct hstate *h);

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void __init hugetlb_bad_size(void);
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void __init hugetlb_add_hstate(unsigned order);
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])
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static inline struct hstate *hstate_inode(struct inode *i)
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{
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	return HUGETLBFS_SB(i->i_sb)->hstate;
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}

static inline struct hstate *hstate_file(struct file *f)
{
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	return hstate_inode(file_inode(f));
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}

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static inline struct hstate *hstate_sizelog(int page_size_log)
{
	if (!page_size_log)
		return &default_hstate;
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	return size_to_hstate(1UL << page_size_log);
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}

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static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
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{
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	return hstate_file(vma->vm_file);
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}

static inline unsigned long huge_page_size(struct hstate *h)
{
	return (unsigned long)PAGE_SIZE << h->order;
}

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extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);

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extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);

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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;
}

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static inline bool hstate_is_gigantic(struct hstate *h)
{
	return huge_page_order(h) >= MAX_ORDER;
}

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static inline unsigned int pages_per_huge_page(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>

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#ifndef arch_make_huge_pte
static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
				       struct page *page, int writable)
{
	return entry;
}
#endif

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static inline struct hstate *page_hstate(struct page *page)
{
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	VM_BUG_ON_PAGE(!PageHuge(page), page);
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	return size_to_hstate(PAGE_SIZE << compound_order(page));
}

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static inline unsigned hstate_index_to_shift(unsigned index)
{
	return hstates[index].order + PAGE_SHIFT;
}

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static inline int hstate_index(struct hstate *h)
{
	return h - hstates;
}

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pgoff_t __basepage_index(struct page *page);

/* Return page->index in PAGE_SIZE units */
static inline pgoff_t basepage_index(struct page *page)
{
	if (!PageCompound(page))
		return page->index;

	return __basepage_index(page);
}

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extern int dissolve_free_huge_page(struct page *page);
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extern int dissolve_free_huge_pages(unsigned long start_pfn,
				    unsigned long end_pfn);
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static inline bool hugepage_migration_supported(struct hstate *h)
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{
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#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
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	if ((huge_page_shift(h) == PMD_SHIFT) ||
		(huge_page_shift(h) == PGDIR_SHIFT))
		return true;
	else
		return false;
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#else
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	return false;
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#endif
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}
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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;
}

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#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
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void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);

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);
}
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#ifndef set_huge_swap_pte_at
static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
					pte_t *ptep, pte_t pte, unsigned long sz)
{
	set_huge_pte_at(mm, addr, ptep, pte);
}
#endif
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#else	/* CONFIG_HUGETLB_PAGE */
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struct hstate {};
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#define alloc_huge_page(v, a, r) NULL
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#define alloc_huge_page_node(h, nid) NULL
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#define alloc_huge_page_nodemask(h, preferred_nid, nmask) NULL
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#define alloc_huge_page_vma(h, vma, address) NULL
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#define alloc_bootmem_huge_page(h) NULL
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#define hstate_file(f) NULL
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#define hstate_sizelog(s) NULL
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#define hstate_vma(v) NULL
#define hstate_inode(i) NULL
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#define page_hstate(page) NULL
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#define huge_page_size(h) PAGE_SIZE
#define huge_page_mask(h) PAGE_MASK
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#define vma_kernel_pagesize(v) PAGE_SIZE
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#define vma_mmu_pagesize(v) PAGE_SIZE
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#define huge_page_order(h) 0
#define huge_page_shift(h) PAGE_SHIFT
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static inline bool hstate_is_gigantic(struct hstate *h)
{
	return false;
}

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static inline unsigned int pages_per_huge_page(struct hstate *h)
{
	return 1;
}
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static inline unsigned hstate_index_to_shift(unsigned index)
{
	return 0;
}

static inline int hstate_index(struct hstate *h)
{
	return 0;
}
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static inline pgoff_t basepage_index(struct page *page)
{
	return page->index;
}
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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;
}
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static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
					   struct mm_struct *mm, pte_t *pte)
{
	return &mm->page_table_lock;
}
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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)
{
}
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static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
					pte_t *ptep, pte_t pte, unsigned long sz)
{
}
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#endif	/* CONFIG_HUGETLB_PAGE */
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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;
}

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#endif /* _LINUX_HUGETLB_H */