[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 *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 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;

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;
}

static inline bool transhuge_vma_enabled(struct vm_area_struct *vma,
					  unsigned long vm_flags)
{
	/* Explicitly disabled through madvise. */
	if ((vm_flags & VM_NOHUGEPAGE) ||
	    test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
		return false;
	return true;
}

/*
 * to be used on vmas which are known to support THP.
 * Use transparent_hugepage_active 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 (!transhuge_vma_enabled(vma, vma->vm_flags))
		return false;

	if (vma_is_temporary_stack(vma))
		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_active(struct vm_area_struct *vma);

#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_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;
}

/**
 * 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 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 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 folio_test_pmd_mappable(struct folio *folio)
{
	return false;
}

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

static inline bool transparent_hugepage_active(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 bool transhuge_vma_enabled(struct vm_area_struct *vma,
					  unsigned long vm_flags)
{
	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)
{
	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);
}

/**
 * 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,
8f34f1ea	13	struct vm_area_struct dst_vma, struct vm_area_struct src_vma);
5db4f15c	14	void huge_pmd_set_accessed(struct vm_fault *vmf);
ebfe1b8f RC	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
5db4f15c	27	vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf);
ebfe1b8f RC	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
e6be37b2 ML	118	static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
	119	unsigned long haddr)
	120	{
	121	/* Don't have to check pgoff for anonymous vma */
	122	if (!vma_is_anonymous(vma)) {
	123	if (!IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
	124	HPAGE_PMD_NR))
	125	return false;
	126	}
	127
	128	if (haddr < vma->vm_start \|\| haddr + HPAGE_PMD_SIZE > vma->vm_end)
	129	return false;
	130	return true;
	131	}
	132
	133	static inline bool transhuge_vma_enabled(struct vm_area_struct *vma,
	134	unsigned long vm_flags)
	135	{
	136	/* Explicitly disabled through madvise. */
	137	if ((vm_flags & VM_NOHUGEPAGE) \|\|
	138	test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
	139	return false;
	140	return true;
	141	}
	142
7635d9cb MH	143	/*
7635d9cb MH	144	* to be used on vmas which are known to support THP.
e6be37b2	145	* Use transparent_hugepage_active otherwise
7635d9cb MH	146	*/
7635d9cb MH	147	static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
16981d76	148	{
bae84953 AK	149
	150	/*
	151	* If the hardware/firmware marked hugepage support disabled.
	152	*/
	153	if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_NEVER_DAX))
	154	return false;
	155
e6be37b2	156	if (!transhuge_vma_enabled(vma, vma->vm_flags))
16981d76 DW	157	return false;
16981d76 DW	158
222100ee	159	if (vma_is_temporary_stack(vma))
16981d76 DW	160	return false;
16981d76 DW	161
16981d76 DW	162	if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
16981d76 DW	163	return true;
bae84953	164
baabda26 DW	165	if (vma_is_dax(vma))
	166	return true;
	167
16981d76 DW	168	if (transparent_hugepage_flags &
	169	(1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
	170	return !!(vma->vm_flags & VM_HUGEPAGE);
	171
	172	return false;
	173	}
	174
e6be37b2	175	bool transparent_hugepage_active(struct vm_area_struct *vma);
43675e6f	176
79da5407 KS	177	#define transparent_hugepage_use_zero_page() \
	178	(transparent_hugepage_flags & \
	179	(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
71e3aac0	180
ebfe1b8f RC	181	unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
ebfe1b8f RC	182	unsigned long len, unsigned long pgoff, unsigned long flags);
74d2fad1	183
ebfe1b8f RC	184	void prep_transhuge_page(struct page *page);
ebfe1b8f RC	185	void free_transhuge_page(struct page *page);
005ba37c	186	bool is_transparent_hugepage(struct page *page);
9a982250	187
b8f593cd	188	bool can_split_huge_page(struct page page, int pextra_pins);
e9b61f19 KS	189	int split_huge_page_to_list(struct page page, struct list_head list);
	190	static inline int split_huge_page(struct page *page)
	191	{
	192	return split_huge_page_to_list(page, NULL);
	193	}
9a982250	194	void deferred_split_huge_page(struct page *page);
eef1b3ba KS	195
eef1b3ba KS	196	void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
33f4751e	197	unsigned long address, bool freeze, struct page *page);
eef1b3ba KS	198
	199	#define split_huge_pmd(__vma, __pmd, __address) \
	200	do { \
	201	pmd_t *____pmd = (__pmd); \
84c3fc4e	202	if (is_swap_pmd(____pmd) \|\| pmd_trans_huge(____pmd) \
5c7fb56e	203	\|\| pmd_devmap(*____pmd)) \
fec89c10	204	__split_huge_pmd(__vma, __pmd, __address, \
33f4751e	205	false, NULL); \
eef1b3ba	206	} while (0)
ad0bed24	207
2a52bcbc	208
fec89c10 KS	209	void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
fec89c10 KS	210	bool freeze, struct page *page);
2a52bcbc	211
a00cc7d9 MW	212	void __split_huge_pud(struct vm_area_struct vma, pud_t pud,
	213	unsigned long address);
	214
	215	#define split_huge_pud(__vma, __pud, __address) \
	216	do { \
	217	pud_t *____pud = (__pud); \
	218	if (pud_trans_huge(*____pud) \
	219	\|\| pud_devmap(*____pud)) \
	220	__split_huge_pud(__vma, __pud, __address); \
	221	} while (0)
	222
ebfe1b8f RC	223	int hugepage_madvise(struct vm_area_struct vma, unsigned long vm_flags,
	224	int advice);
	225	void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start,
	226	unsigned long end, long adjust_next);
	227	spinlock_t __pmd_trans_huge_lock(pmd_t pmd, struct vm_area_struct *vma);
	228	spinlock_t __pud_trans_huge_lock(pud_t pud, struct vm_area_struct *vma);
84c3fc4e ZY	229
	230	static inline int is_swap_pmd(pmd_t pmd)
	231	{
	232	return !pmd_none(pmd) && !pmd_present(pmd);
	233	}
	234
c1e8d7c6	235	/* mmap_lock must be held on entry */
b6ec57f4 KS	236	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	237	struct vm_area_struct *vma)
025c5b24	238	{
84c3fc4e	239	if (is_swap_pmd(pmd) \|\| pmd_trans_huge(pmd) \|\| pmd_devmap(*pmd))
b6ec57f4	240	return __pmd_trans_huge_lock(pmd, vma);
025c5b24	241	else
969e8d7e	242	return NULL;
025c5b24	243	}
a00cc7d9 MW	244	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	245	struct vm_area_struct *vma)
	246	{
a00cc7d9 MW	247	if (pud_trans_huge(pud) \|\| pud_devmap(pud))
	248	return __pud_trans_huge_lock(pud, vma);
	249	else
	250	return NULL;
	251	}
6ffbb458 MWO	252
	253	/**
	254	* thp_order - Order of a transparent huge page.
	255	* @page: Head page of a transparent huge page.
	256	*/
	257	static inline unsigned int thp_order(struct page *page)
	258	{
	259	VM_BUG_ON_PGFLAGS(PageTail(page), page);
	260	if (PageHead(page))
	261	return HPAGE_PMD_ORDER;
	262	return 0;
	263	}
	264
6c357848 MWO	265	/**
	266	* thp_nr_pages - The number of regular pages in this huge page.
	267	* @page: The head page of a huge page.
	268	*/
	269	static inline int thp_nr_pages(struct page *page)
2c888cfb	270	{
6c357848 MWO	271	VM_BUG_ON_PGFLAGS(PageTail(page), page);
6c357848 MWO	272	if (PageHead(page))
2c888cfb RR	273	return HPAGE_PMD_NR;
	274	return 1;
	275	}
d10e63f2	276
5bf34d7c MWO	277	/**
	278	* folio_test_pmd_mappable - Can we map this folio with a PMD?
	279	* @folio: The folio to test
	280	*/
	281	static inline bool folio_test_pmd_mappable(struct folio *folio)
	282	{
	283	return folio_order(folio) >= HPAGE_PMD_ORDER;
	284	}
	285
a00cc7d9	286	struct page follow_devmap_pmd(struct vm_area_struct vma, unsigned long addr,
df06b37f	287	pmd_t pmd, int flags, struct dev_pagemap *pgmap);
a00cc7d9	288	struct page follow_devmap_pud(struct vm_area_struct vma, unsigned long addr,
df06b37f	289	pud_t pud, int flags, struct dev_pagemap *pgmap);
a00cc7d9	290
5db4f15c	291	vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf);
d10e63f2	292
56873f43	293	extern struct page *huge_zero_page;
3b77e8c8	294	extern unsigned long huge_zero_pfn;
56873f43 WY	295
	296	static inline bool is_huge_zero_page(struct page *page)
	297	{
6aa7de05	298	return READ_ONCE(huge_zero_page) == page;
56873f43 WY	299	}
56873f43 WY	300
fc437044 MW	301	static inline bool is_huge_zero_pmd(pmd_t pmd)
fc437044 MW	302	{
3b77e8c8	303	return READ_ONCE(huge_zero_pfn) == pmd_pfn(pmd) && pmd_present(pmd);
fc437044 MW	304	}
fc437044 MW	305
a00cc7d9 MW	306	static inline bool is_huge_zero_pud(pud_t pud)
	307	{
	308	return false;
	309	}
	310
6fcb52a5 AL	311	struct page mm_get_huge_zero_page(struct mm_struct mm);
6fcb52a5 AL	312	void mm_put_huge_zero_page(struct mm_struct *mm);
fc437044	313
10102459 KS	314	#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
10102459 KS	315
9c670ea3 NH	316	static inline bool thp_migration_supported(void)
	317	{
	318	return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
	319	}
	320
87eaceb3 YS	321	static inline struct list_head page_deferred_list(struct page page)
	322	{
	323	/*
	324	* Global or memcg deferred list in the second tail pages is
	325	* occupied by compound_head.
	326	*/
	327	return &page[2].deferred_list;
	328	}
	329
71e3aac0	330	#else /* CONFIG_TRANSPARENT_HUGEPAGE */
d8c37c48 NH	331	#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
	332	#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
	333	#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
71e3aac0	334
a00cc7d9 MW	335	#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
	336	#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
	337	#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
	338
6ffbb458 MWO	339	static inline unsigned int thp_order(struct page *page)
	340	{
	341	VM_BUG_ON_PGFLAGS(PageTail(page), page);
	342	return 0;
	343	}
	344
6c357848	345	static inline int thp_nr_pages(struct page *page)
77d6b909	346	{
6c357848	347	VM_BUG_ON_PGFLAGS(PageTail(page), page);
77d6b909 MWO	348	return 1;
77d6b909 MWO	349	}
2c888cfb	350
5bf34d7c MWO	351	static inline bool folio_test_pmd_mappable(struct folio *folio)
	352	{
	353	return false;
	354	}
	355
7635d9cb MH	356	static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
	357	{
	358	return false;
	359	}
	360
e6be37b2	361	static inline bool transparent_hugepage_active(struct vm_area_struct *vma)
16981d76 DW	362	{
	363	return false;
	364	}
71e3aac0	365
43675e6f YS	366	static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
	367	unsigned long haddr)
	368	{
	369	return false;
	370	}
	371
e6be37b2 ML	372	static inline bool transhuge_vma_enabled(struct vm_area_struct *vma,
	373	unsigned long vm_flags)
	374	{
	375	return false;
	376	}
	377
800d8c63 KS	378	static inline void prep_transhuge_page(struct page *page) {}
800d8c63 KS	379
005ba37c SC	380	static inline bool is_transparent_hugepage(struct page *page)
	381	{
	382	return false;
	383	}
	384
71e3aac0	385	#define transparent_hugepage_flags 0UL
74d2fad1 TK	386
	387	#define thp_get_unmapped_area NULL
	388
b8f593cd HY	389	static inline bool
	390	can_split_huge_page(struct page page, int pextra_pins)
	391	{
	392	BUILD_BUG();
	393	return false;
	394	}
5bc7b8ac SL	395	static inline int
	396	split_huge_page_to_list(struct page page, struct list_head list)
	397	{
	398	return 0;
	399	}
71e3aac0 AA	400	static inline int split_huge_page(struct page *page)
	401	{
	402	return 0;
	403	}
9a982250	404	static inline void deferred_split_huge_page(struct page *page) {}
78ddc534	405	#define split_huge_pmd(__vma, __pmd, __address) \
e180377f	406	do { } while (0)
2a52bcbc	407
fd60775a DR	408	static inline void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
fd60775a DR	409	unsigned long address, bool freeze, struct page *page) {}
2a52bcbc	410	static inline void split_huge_pmd_address(struct vm_area_struct *vma,
fec89c10	411	unsigned long address, bool freeze, struct page *page) {}
2a52bcbc	412
a00cc7d9 MW	413	#define split_huge_pud(__vma, __pmd, __address) \
	414	do { } while (0)
	415
60ab3244 AA	416	static inline int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	417	unsigned long *vm_flags, int advice)
0af4e98b AA	418	{
	419	BUG();
	420	return 0;
	421	}
94fcc585 AA	422	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	423	unsigned long start,
	424	unsigned long end,
	425	long adjust_next)
	426	{
	427	}
84c3fc4e ZY	428	static inline int is_swap_pmd(pmd_t pmd)
	429	{
	430	return 0;
	431	}
b6ec57f4 KS	432	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	433	struct vm_area_struct *vma)
025c5b24	434	{
b6ec57f4	435	return NULL;
025c5b24	436	}
a00cc7d9 MW	437	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	438	struct vm_area_struct *vma)
	439	{
	440	return NULL;
	441	}
d10e63f2	442
5db4f15c	443	static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf)
d10e63f2	444	{
4daae3b4	445	return 0;
d10e63f2 MG	446	}
d10e63f2 MG	447
56873f43 WY	448	static inline bool is_huge_zero_page(struct page *page)
	449	{
	450	return false;
	451	}
	452
3b77e8c8 HD	453	static inline bool is_huge_zero_pmd(pmd_t pmd)
	454	{
	455	return false;
	456	}
	457
a00cc7d9 MW	458	static inline bool is_huge_zero_pud(pud_t pud)
	459	{
	460	return false;
	461	}
	462
6fcb52a5	463	static inline void mm_put_huge_zero_page(struct mm_struct *mm)
aa88b68c	464	{
6fcb52a5	465	return;
aa88b68c	466	}
3565fce3 DW	467
3565fce3 DW	468	static inline struct page follow_devmap_pmd(struct vm_area_struct vma,
df06b37f	469	unsigned long addr, pmd_t pmd, int flags, struct dev_pagemap *pgmap)
3565fce3 DW	470	{
	471	return NULL;
	472	}
a00cc7d9 MW	473
a00cc7d9 MW	474	static inline struct page follow_devmap_pud(struct vm_area_struct vma,
df06b37f	475	unsigned long addr, pud_t pud, int flags, struct dev_pagemap *pgmap)
a00cc7d9 MW	476	{
	477	return NULL;
	478	}
9c670ea3 NH	479
	480	static inline bool thp_migration_supported(void)
	481	{
	482	return false;
	483	}
71e3aac0 AA	484	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
71e3aac0 AA	485
346cf613 MWO	486	static inline int split_folio_to_list(struct folio *folio,
	487	struct list_head *list)
	488	{
	489	return split_huge_page_to_list(&folio->page, list);
	490	}
	491
af3bbc12 MWO	492	/**
	493	* thp_size - Size of a transparent huge page.
	494	* @page: Head page of a transparent huge page.
	495	*
	496	* Return: Number of bytes in this page.
	497	*/
	498	static inline unsigned long thp_size(struct page *page)
	499	{
	500	return PAGE_SIZE << thp_order(page);
	501	}
	502
71e3aac0	503	#endif /* _LINUX_HUGE_MM_H */