[linux-block.git] / include / linux / huge_mm.h

/* 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 *vma);
void huge_pmd_set_accessed(struct vm_fault *vmf, pmd_t orig_pmd);
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, pmd_t orig_pmd);
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 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;

/*
 * to be used on vmas which are known to support THP.
 * Use transparent_hugepage_enabled otherwise
 */
static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
{

	/*
	 * If the hardware/firmware marked hugepage support disabled.
	 */
	if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_NEVER_DAX))
		return false;

	if (vma->vm_flags & VM_NOHUGEPAGE)
		return false;

	if (vma_is_temporary_stack(vma))
		return false;

	if (test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
		return false;

	if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
		return true;

	if (vma_is_dax(vma))
		return true;

	if (transparent_hugepage_flags &
				(1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
		return !!(vma->vm_flags & VM_HUGEPAGE);

	return false;
}

bool transparent_hugepage_enabled(struct vm_area_struct *vma);

static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
		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;
	}

	if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end)
		return false;
	return true;
}

#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 is_transparent_hugepage(struct page *page);

bool can_split_huge_page(struct page *page, 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 page *page);

#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 page *page);

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);
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;
}

/**
 * thp_head - Head page of a transparent huge page.
 * @page: Any page (tail, head or regular) found in the page cache.
 */
static inline struct page *thp_head(struct page *page)
{
	return compound_head(page);
}

/**
 * thp_order - Order of a transparent huge page.
 * @page: Head page of a transparent huge page.
 */
static inline unsigned int thp_order(struct page *page)
{
	VM_BUG_ON_PGFLAGS(PageTail(page), page);
	if (PageHead(page))
		return HPAGE_PMD_ORDER;
	return 0;
}

/**
 * thp_nr_pages - The number of regular pages in this huge page.
 * @page: The head page of a huge page.
 */
static inline int thp_nr_pages(struct page *page)
{
	VM_BUG_ON_PGFLAGS(PageTail(page), page);
	if (PageHead(page))
		return HPAGE_PMD_NR;
	return 1;
}

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, pmd_t orig_pmd);

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 READ_ONCE(huge_zero_pfn) == pmd_pfn(pmd) && pmd_present(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)
{
	/*
	 * Global or memcg deferred list in the second tail pages is
	 * occupied by compound_head.
	 */
	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 struct page *thp_head(struct page *page)
{
	VM_BUG_ON_PGFLAGS(PageTail(page), page);
	return page;
}

static inline unsigned int thp_order(struct page *page)
{
	VM_BUG_ON_PGFLAGS(PageTail(page), page);
	return 0;
}

static inline int thp_nr_pages(struct page *page)
{
	VM_BUG_ON_PGFLAGS(PageTail(page), page);
	return 1;
}

static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
{
	return false;
}

static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
{
	return false;
}

static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
		unsigned long haddr)
{
	return false;
}

static inline void prep_transhuge_page(struct page *page) {}

static inline bool is_transparent_hugepage(struct page *page)
{
	return false;
}

#define transparent_hugepage_flags 0UL

#define thp_get_unmapped_area	NULL

static inline bool
can_split_huge_page(struct page *page, int *pextra_pins)
{
	BUILD_BUG();
	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 page *page) {}
static inline void split_huge_pmd_address(struct vm_area_struct *vma,
		unsigned long address, bool freeze, struct page *page) {}

#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)
{
	BUG();
	return 0;
}
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,
		pmd_t orig_pmd)
{
	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 */

/**
 * thp_size - Size of a transparent huge page.
 * @page: Head page of a transparent huge page.
 *
 * Return: Number of bytes in this page.
 */
static inline unsigned long thp_size(struct page *page)
{
	return PAGE_SIZE << thp_order(page);
}

#endif /* _LINUX_HUGE_MM_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
71e3aac0 AA	2	#ifndef _LINUX_HUGE_MM_H
	3	#define _LINUX_HUGE_MM_H
	4
16981d76	5	#include <linux/sched/coredump.h>
226ab561	6	#include <linux/mm_types.h>
16981d76	7
baabda26 DW	8	#include <linux/fs.h> /* only for vma_is_dax() */
baabda26 DW	9
ebfe1b8f RC	10	vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf);
	11	int copy_huge_pmd(struct mm_struct dst_mm, struct mm_struct src_mm,
	12	pmd_t dst_pmd, pmd_t src_pmd, unsigned long addr,
	13	struct vm_area_struct *vma);
	14	void huge_pmd_set_accessed(struct vm_fault *vmf, pmd_t orig_pmd);
	15	int copy_huge_pud(struct mm_struct dst_mm, struct mm_struct src_mm,
	16	pud_t dst_pud, pud_t src_pud, unsigned long addr,
	17	struct vm_area_struct *vma);
a00cc7d9 MW	18
a00cc7d9 MW	19	#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
ebfe1b8f	20	void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud);
a00cc7d9 MW	21	#else
	22	static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud)
	23	{
	24	}
	25	#endif
	26
ebfe1b8f RC	27	vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd);
	28	struct page follow_trans_huge_pmd(struct vm_area_struct vma,
	29	unsigned long addr, pmd_t *pmd,
	30	unsigned int flags);
	31	bool madvise_free_huge_pmd(struct mmu_gather tlb, struct vm_area_struct vma,
	32	pmd_t *pmd, unsigned long addr, unsigned long next);
	33	int zap_huge_pmd(struct mmu_gather tlb, struct vm_area_struct vma, pmd_t *pmd,
	34	unsigned long addr);
	35	int zap_huge_pud(struct mmu_gather tlb, struct vm_area_struct vma, pud_t *pud,
	36	unsigned long addr);
	37	bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
	38	unsigned long new_addr, pmd_t old_pmd, pmd_t new_pmd);
	39	int change_huge_pmd(struct vm_area_struct vma, pmd_t pmd, unsigned long addr,
	40	pgprot_t newprot, unsigned long cp_flags);
9a9731b1 THV	41	vm_fault_t vmf_insert_pfn_pmd_prot(struct vm_fault *vmf, pfn_t pfn,
	42	pgprot_t pgprot, bool write);
	43
	44	/**
	45	* vmf_insert_pfn_pmd - insert a pmd size pfn
	46	* @vmf: Structure describing the fault
	47	* @pfn: pfn to insert
	48	* @pgprot: page protection to use
	49	* @write: whether it's a write fault
	50	*
	51	* Insert a pmd size pfn. See vmf_insert_pfn() for additional info.
	52	*
	53	* Return: vm_fault_t value.
	54	*/
	55	static inline vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn,
	56	bool write)
	57	{
	58	return vmf_insert_pfn_pmd_prot(vmf, pfn, vmf->vma->vm_page_prot, write);
	59	}
	60	vm_fault_t vmf_insert_pfn_pud_prot(struct vm_fault *vmf, pfn_t pfn,
	61	pgprot_t pgprot, bool write);
	62
	63	/**
	64	* vmf_insert_pfn_pud - insert a pud size pfn
	65	* @vmf: Structure describing the fault
	66	* @pfn: pfn to insert
	67	* @pgprot: page protection to use
	68	* @write: whether it's a write fault
	69	*
	70	* Insert a pud size pfn. See vmf_insert_pfn() for additional info.
	71	*
	72	* Return: vm_fault_t value.
	73	*/
	74	static inline vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn,
	75	bool write)
	76	{
	77	return vmf_insert_pfn_pud_prot(vmf, pfn, vmf->vma->vm_page_prot, write);
	78	}
	79
71e3aac0	80	enum transparent_hugepage_flag {
bae84953	81	TRANSPARENT_HUGEPAGE_NEVER_DAX,
71e3aac0 AA	82	TRANSPARENT_HUGEPAGE_FLAG,
71e3aac0 AA	83	TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
444eb2a4 MG	84	TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
444eb2a4 MG	85	TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
21440d7e	86	TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
71e3aac0	87	TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
ba76149f	88	TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
79da5407	89	TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
71e3aac0 AA	90	};
71e3aac0 AA	91
b46e756f KS	92	struct kobject;
	93	struct kobj_attribute;
	94
ebfe1b8f RC	95	ssize_t single_hugepage_flag_store(struct kobject *kobj,
	96	struct kobj_attribute *attr,
	97	const char *buf, size_t count,
	98	enum transparent_hugepage_flag flag);
	99	ssize_t single_hugepage_flag_show(struct kobject *kobj,
	100	struct kobj_attribute attr, char buf,
	101	enum transparent_hugepage_flag flag);
5a6e75f8 KS	102	extern struct kobj_attribute shmem_enabled_attr;
5a6e75f8 KS	103
d8c37c48 NH	104	#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
	105	#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
	106
71e3aac0	107	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
fde52796 AK	108	#define HPAGE_PMD_SHIFT PMD_SHIFT
	109	#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
	110	#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
71e3aac0	111
a00cc7d9 MW	112	#define HPAGE_PUD_SHIFT PUD_SHIFT
	113	#define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
	114	#define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
	115
16981d76 DW	116	extern unsigned long transparent_hugepage_flags;
16981d76 DW	117
7635d9cb MH	118	/*
	119	* to be used on vmas which are known to support THP.
	120	* Use transparent_hugepage_enabled otherwise
	121	*/
	122	static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
16981d76	123	{
bae84953 AK	124
	125	/*
	126	* If the hardware/firmware marked hugepage support disabled.
	127	*/
	128	if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_NEVER_DAX))
	129	return false;
	130
16981d76 DW	131	if (vma->vm_flags & VM_NOHUGEPAGE)
	132	return false;
	133
222100ee	134	if (vma_is_temporary_stack(vma))
16981d76 DW	135	return false;
	136
	137	if (test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
	138	return false;
	139
	140	if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
	141	return true;
bae84953	142
baabda26 DW	143	if (vma_is_dax(vma))
	144	return true;
	145
16981d76 DW	146	if (transparent_hugepage_flags &
	147	(1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
	148	return !!(vma->vm_flags & VM_HUGEPAGE);
	149
	150	return false;
	151	}
	152
7635d9cb MH	153	bool transparent_hugepage_enabled(struct vm_area_struct *vma);
7635d9cb MH	154
43675e6f YS	155	static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
	156	unsigned long haddr)
	157	{
	158	/* Don't have to check pgoff for anonymous vma */
	159	if (!vma_is_anonymous(vma)) {
b2bd53f1 ML	160	if (!IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
b2bd53f1 ML	161	HPAGE_PMD_NR))
43675e6f YS	162	return false;
	163	}
	164
	165	if (haddr < vma->vm_start \|\| haddr + HPAGE_PMD_SIZE > vma->vm_end)
	166	return false;
	167	return true;
	168	}
	169
79da5407 KS	170	#define transparent_hugepage_use_zero_page() \
	171	(transparent_hugepage_flags & \
	172	(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
71e3aac0	173
ebfe1b8f RC	174	unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
ebfe1b8f RC	175	unsigned long len, unsigned long pgoff, unsigned long flags);
74d2fad1	176
ebfe1b8f RC	177	void prep_transhuge_page(struct page *page);
ebfe1b8f RC	178	void free_transhuge_page(struct page *page);
005ba37c	179	bool is_transparent_hugepage(struct page *page);
9a982250	180
b8f593cd	181	bool can_split_huge_page(struct page page, int pextra_pins);
e9b61f19 KS	182	int split_huge_page_to_list(struct page page, struct list_head list);
	183	static inline int split_huge_page(struct page *page)
	184	{
	185	return split_huge_page_to_list(page, NULL);
	186	}
9a982250	187	void deferred_split_huge_page(struct page *page);
eef1b3ba KS	188
eef1b3ba KS	189	void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
33f4751e	190	unsigned long address, bool freeze, struct page *page);
eef1b3ba KS	191
	192	#define split_huge_pmd(__vma, __pmd, __address) \
	193	do { \
	194	pmd_t *____pmd = (__pmd); \
84c3fc4e	195	if (is_swap_pmd(____pmd) \|\| pmd_trans_huge(____pmd) \
5c7fb56e	196	\|\| pmd_devmap(*____pmd)) \
fec89c10	197	__split_huge_pmd(__vma, __pmd, __address, \
33f4751e	198	false, NULL); \
eef1b3ba	199	} while (0)
ad0bed24	200
2a52bcbc	201
fec89c10 KS	202	void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
fec89c10 KS	203	bool freeze, struct page *page);
2a52bcbc	204
a00cc7d9 MW	205	void __split_huge_pud(struct vm_area_struct vma, pud_t pud,
	206	unsigned long address);
	207
	208	#define split_huge_pud(__vma, __pud, __address) \
	209	do { \
	210	pud_t *____pud = (__pud); \
	211	if (pud_trans_huge(*____pud) \
	212	\|\| pud_devmap(*____pud)) \
	213	__split_huge_pud(__vma, __pud, __address); \
	214	} while (0)
	215
ebfe1b8f RC	216	int hugepage_madvise(struct vm_area_struct vma, unsigned long vm_flags,
	217	int advice);
	218	void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start,
	219	unsigned long end, long adjust_next);
	220	spinlock_t __pmd_trans_huge_lock(pmd_t pmd, struct vm_area_struct *vma);
	221	spinlock_t __pud_trans_huge_lock(pud_t pud, struct vm_area_struct *vma);
84c3fc4e ZY	222
	223	static inline int is_swap_pmd(pmd_t pmd)
	224	{
	225	return !pmd_none(pmd) && !pmd_present(pmd);
	226	}
	227
c1e8d7c6	228	/* mmap_lock must be held on entry */
b6ec57f4 KS	229	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	230	struct vm_area_struct *vma)
025c5b24	231	{
84c3fc4e	232	if (is_swap_pmd(pmd) \|\| pmd_trans_huge(pmd) \|\| pmd_devmap(*pmd))
b6ec57f4	233	return __pmd_trans_huge_lock(pmd, vma);
025c5b24	234	else
969e8d7e	235	return NULL;
025c5b24	236	}
a00cc7d9 MW	237	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	238	struct vm_area_struct *vma)
	239	{
a00cc7d9 MW	240	if (pud_trans_huge(pud) \|\| pud_devmap(pud))
	241	return __pud_trans_huge_lock(pud, vma);
	242	else
	243	return NULL;
	244	}
6ffbb458	245
2be1d718 MWO	246	/**
	247	* thp_head - Head page of a transparent huge page.
	248	* @page: Any page (tail, head or regular) found in the page cache.
	249	*/
	250	static inline struct page thp_head(struct page page)
	251	{
	252	return compound_head(page);
	253	}
	254
6ffbb458 MWO	255	/**
	256	* thp_order - Order of a transparent huge page.
	257	* @page: Head page of a transparent huge page.
	258	*/
	259	static inline unsigned int thp_order(struct page *page)
	260	{
	261	VM_BUG_ON_PGFLAGS(PageTail(page), page);
	262	if (PageHead(page))
	263	return HPAGE_PMD_ORDER;
	264	return 0;
	265	}
	266
6c357848 MWO	267	/**
	268	* thp_nr_pages - The number of regular pages in this huge page.
	269	* @page: The head page of a huge page.
	270	*/
	271	static inline int thp_nr_pages(struct page *page)
2c888cfb	272	{
6c357848 MWO	273	VM_BUG_ON_PGFLAGS(PageTail(page), page);
6c357848 MWO	274	if (PageHead(page))
2c888cfb RR	275	return HPAGE_PMD_NR;
	276	return 1;
	277	}
d10e63f2	278
a00cc7d9	279	struct page follow_devmap_pmd(struct vm_area_struct vma, unsigned long addr,
df06b37f	280	pmd_t pmd, int flags, struct dev_pagemap *pgmap);
a00cc7d9	281	struct page follow_devmap_pud(struct vm_area_struct vma, unsigned long addr,
df06b37f	282	pud_t pud, int flags, struct dev_pagemap *pgmap);
a00cc7d9	283
ebfe1b8f	284	vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
d10e63f2	285
56873f43	286	extern struct page *huge_zero_page;
3b77e8c8	287	extern unsigned long huge_zero_pfn;
56873f43 WY	288
	289	static inline bool is_huge_zero_page(struct page *page)
	290	{
6aa7de05	291	return READ_ONCE(huge_zero_page) == page;
56873f43 WY	292	}
56873f43 WY	293
fc437044 MW	294	static inline bool is_huge_zero_pmd(pmd_t pmd)
fc437044 MW	295	{
3b77e8c8	296	return READ_ONCE(huge_zero_pfn) == pmd_pfn(pmd) && pmd_present(pmd);
fc437044 MW	297	}
fc437044 MW	298
a00cc7d9 MW	299	static inline bool is_huge_zero_pud(pud_t pud)
	300	{
	301	return false;
	302	}
	303
6fcb52a5 AL	304	struct page mm_get_huge_zero_page(struct mm_struct mm);
6fcb52a5 AL	305	void mm_put_huge_zero_page(struct mm_struct *mm);
fc437044	306
10102459 KS	307	#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
10102459 KS	308
9c670ea3 NH	309	static inline bool thp_migration_supported(void)
	310	{
	311	return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
	312	}
	313
87eaceb3 YS	314	static inline struct list_head page_deferred_list(struct page page)
	315	{
	316	/*
	317	* Global or memcg deferred list in the second tail pages is
	318	* occupied by compound_head.
	319	*/
	320	return &page[2].deferred_list;
	321	}
	322
71e3aac0	323	#else /* CONFIG_TRANSPARENT_HUGEPAGE */
d8c37c48 NH	324	#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
	325	#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
	326	#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
71e3aac0	327
a00cc7d9 MW	328	#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
	329	#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
	330	#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
	331
2be1d718 MWO	332	static inline struct page thp_head(struct page page)
	333	{
	334	VM_BUG_ON_PGFLAGS(PageTail(page), page);
	335	return page;
	336	}
	337
6ffbb458 MWO	338	static inline unsigned int thp_order(struct page *page)
	339	{
	340	VM_BUG_ON_PGFLAGS(PageTail(page), page);
	341	return 0;
	342	}
	343
6c357848	344	static inline int thp_nr_pages(struct page *page)
77d6b909	345	{
6c357848	346	VM_BUG_ON_PGFLAGS(PageTail(page), page);
77d6b909 MWO	347	return 1;
77d6b909 MWO	348	}
2c888cfb	349
7635d9cb MH	350	static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
	351	{
	352	return false;
	353	}
	354
16981d76 DW	355	static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
	356	{
	357	return false;
	358	}
71e3aac0	359
43675e6f YS	360	static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
	361	unsigned long haddr)
	362	{
	363	return false;
	364	}
	365
800d8c63 KS	366	static inline void prep_transhuge_page(struct page *page) {}
800d8c63 KS	367
005ba37c SC	368	static inline bool is_transparent_hugepage(struct page *page)
	369	{
	370	return false;
	371	}
	372
71e3aac0	373	#define transparent_hugepage_flags 0UL
74d2fad1 TK	374
	375	#define thp_get_unmapped_area NULL
	376
b8f593cd HY	377	static inline bool
	378	can_split_huge_page(struct page page, int pextra_pins)
	379	{
	380	BUILD_BUG();
	381	return false;
	382	}
5bc7b8ac SL	383	static inline int
	384	split_huge_page_to_list(struct page page, struct list_head list)
	385	{
	386	return 0;
	387	}
71e3aac0 AA	388	static inline int split_huge_page(struct page *page)
	389	{
	390	return 0;
	391	}
9a982250	392	static inline void deferred_split_huge_page(struct page *page) {}
78ddc534	393	#define split_huge_pmd(__vma, __pmd, __address) \
e180377f	394	do { } while (0)
2a52bcbc	395
fd60775a DR	396	static inline void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
fd60775a DR	397	unsigned long address, bool freeze, struct page *page) {}
2a52bcbc	398	static inline void split_huge_pmd_address(struct vm_area_struct *vma,
fec89c10	399	unsigned long address, bool freeze, struct page *page) {}
2a52bcbc	400
a00cc7d9 MW	401	#define split_huge_pud(__vma, __pmd, __address) \
	402	do { } while (0)
	403
60ab3244 AA	404	static inline int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	405	unsigned long *vm_flags, int advice)
0af4e98b AA	406	{
	407	BUG();
	408	return 0;
	409	}
94fcc585 AA	410	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	411	unsigned long start,
	412	unsigned long end,
	413	long adjust_next)
	414	{
	415	}
84c3fc4e ZY	416	static inline int is_swap_pmd(pmd_t pmd)
	417	{
	418	return 0;
	419	}
b6ec57f4 KS	420	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	421	struct vm_area_struct *vma)
025c5b24	422	{
b6ec57f4	423	return NULL;
025c5b24	424	}
a00cc7d9 MW	425	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	426	struct vm_area_struct *vma)
	427	{
	428	return NULL;
	429	}
d10e63f2	430
2b740303 SJ	431	static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf,
2b740303 SJ	432	pmd_t orig_pmd)
d10e63f2	433	{
4daae3b4	434	return 0;
d10e63f2 MG	435	}
d10e63f2 MG	436
56873f43 WY	437	static inline bool is_huge_zero_page(struct page *page)
	438	{
	439	return false;
	440	}
	441
3b77e8c8 HD	442	static inline bool is_huge_zero_pmd(pmd_t pmd)
	443	{
	444	return false;
	445	}
	446
a00cc7d9 MW	447	static inline bool is_huge_zero_pud(pud_t pud)
	448	{
	449	return false;
	450	}
	451
6fcb52a5	452	static inline void mm_put_huge_zero_page(struct mm_struct *mm)
aa88b68c	453	{
6fcb52a5	454	return;
aa88b68c	455	}
3565fce3 DW	456
3565fce3 DW	457	static inline struct page follow_devmap_pmd(struct vm_area_struct vma,
df06b37f	458	unsigned long addr, pmd_t pmd, int flags, struct dev_pagemap *pgmap)
3565fce3 DW	459	{
	460	return NULL;
	461	}
a00cc7d9 MW	462
a00cc7d9 MW	463	static inline struct page follow_devmap_pud(struct vm_area_struct vma,
df06b37f	464	unsigned long addr, pud_t pud, int flags, struct dev_pagemap *pgmap)
a00cc7d9 MW	465	{
	466	return NULL;
	467	}
9c670ea3 NH	468
	469	static inline bool thp_migration_supported(void)
	470	{
	471	return false;
	472	}
71e3aac0 AA	473	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
71e3aac0 AA	474
af3bbc12 MWO	475	/**
	476	* thp_size - Size of a transparent huge page.
	477	* @page: Head page of a transparent huge page.
	478	*
	479	* Return: Number of bytes in this page.
	480	*/
	481	static inline unsigned long thp_size(struct page *page)
	482	{
	483	return PAGE_SIZE << thp_order(page);
	484	}
	485
71e3aac0	486	#endif /* _LINUX_HUGE_MM_H */