[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 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;

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;
}

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 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 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);
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 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 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) {}

#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)
{
	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);
}

#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);
4a18419f NA	39	int change_huge_pmd(struct mmu_gather tlb, struct vm_area_struct vma,
	40	pmd_t *pmd, unsigned long addr, pgprot_t newprot,
	41	unsigned long cp_flags);
9a9731b1 THV	42	vm_fault_t vmf_insert_pfn_pmd_prot(struct vm_fault *vmf, pfn_t pfn,
	43	pgprot_t pgprot, bool write);
	44
	45	/**
	46	* vmf_insert_pfn_pmd - insert a pmd size pfn
	47	* @vmf: Structure describing the fault
	48	* @pfn: pfn to insert
	49	* @pgprot: page protection to use
	50	* @write: whether it's a write fault
	51	*
	52	* Insert a pmd size pfn. See vmf_insert_pfn() for additional info.
	53	*
	54	* Return: vm_fault_t value.
	55	*/
	56	static inline vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn,
	57	bool write)
	58	{
	59	return vmf_insert_pfn_pmd_prot(vmf, pfn, vmf->vma->vm_page_prot, write);
	60	}
	61	vm_fault_t vmf_insert_pfn_pud_prot(struct vm_fault *vmf, pfn_t pfn,
	62	pgprot_t pgprot, bool write);
	63
	64	/**
	65	* vmf_insert_pfn_pud - insert a pud size pfn
	66	* @vmf: Structure describing the fault
	67	* @pfn: pfn to insert
	68	* @pgprot: page protection to use
	69	* @write: whether it's a write fault
	70	*
	71	* Insert a pud size pfn. See vmf_insert_pfn() for additional info.
	72	*
	73	* Return: vm_fault_t value.
	74	*/
	75	static inline vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn,
	76	bool write)
	77	{
	78	return vmf_insert_pfn_pud_prot(vmf, pfn, vmf->vma->vm_page_prot, write);
	79	}
	80
71e3aac0	81	enum transparent_hugepage_flag {
bae84953	82	TRANSPARENT_HUGEPAGE_NEVER_DAX,
71e3aac0 AA	83	TRANSPARENT_HUGEPAGE_FLAG,
71e3aac0 AA	84	TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
444eb2a4 MG	85	TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
444eb2a4 MG	86	TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
21440d7e	87	TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
71e3aac0	88	TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
ba76149f	89	TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
79da5407	90	TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
71e3aac0 AA	91	};
71e3aac0 AA	92
b46e756f KS	93	struct kobject;
	94	struct kobj_attribute;
	95
ebfe1b8f RC	96	ssize_t single_hugepage_flag_store(struct kobject *kobj,
	97	struct kobj_attribute *attr,
	98	const char *buf, size_t count,
	99	enum transparent_hugepage_flag flag);
	100	ssize_t single_hugepage_flag_show(struct kobject *kobj,
	101	struct kobj_attribute attr, char buf,
	102	enum transparent_hugepage_flag flag);
5a6e75f8 KS	103	extern struct kobj_attribute shmem_enabled_attr;
5a6e75f8 KS	104
d8c37c48 NH	105	#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
	106	#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
	107
71e3aac0	108	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
fde52796 AK	109	#define HPAGE_PMD_SHIFT PMD_SHIFT
	110	#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
	111	#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
71e3aac0	112
a00cc7d9 MW	113	#define HPAGE_PUD_SHIFT PUD_SHIFT
	114	#define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
	115	#define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
	116
16981d76 DW	117	extern unsigned long transparent_hugepage_flags;
16981d76 DW	118
e6be37b2 ML	119	static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
	120	unsigned long haddr)
	121	{
	122	/* Don't have to check pgoff for anonymous vma */
	123	if (!vma_is_anonymous(vma)) {
	124	if (!IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
	125	HPAGE_PMD_NR))
	126	return false;
	127	}
	128
	129	if (haddr < vma->vm_start \|\| haddr + HPAGE_PMD_SIZE > vma->vm_end)
	130	return false;
	131	return true;
	132	}
	133
	134	static inline bool transhuge_vma_enabled(struct vm_area_struct *vma,
	135	unsigned long vm_flags)
	136	{
	137	/* Explicitly disabled through madvise. */
	138	if ((vm_flags & VM_NOHUGEPAGE) \|\|
	139	test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
	140	return false;
	141	return true;
	142	}
	143
7635d9cb MH	144	/*
7635d9cb MH	145	* to be used on vmas which are known to support THP.
e6be37b2	146	* Use transparent_hugepage_active otherwise
7635d9cb MH	147	*/
7635d9cb MH	148	static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
16981d76	149	{
bae84953 AK	150
	151	/*
	152	* If the hardware/firmware marked hugepage support disabled.
	153	*/
	154	if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_NEVER_DAX))
	155	return false;
	156
e6be37b2	157	if (!transhuge_vma_enabled(vma, vma->vm_flags))
16981d76 DW	158	return false;
16981d76 DW	159
222100ee	160	if (vma_is_temporary_stack(vma))
16981d76 DW	161	return false;
16981d76 DW	162
16981d76 DW	163	if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
16981d76 DW	164	return true;
bae84953	165
baabda26 DW	166	if (vma_is_dax(vma))
	167	return true;
	168
16981d76 DW	169	if (transparent_hugepage_flags &
	170	(1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
	171	return !!(vma->vm_flags & VM_HUGEPAGE);
	172
	173	return false;
	174	}
	175
78d12c19 YS	176	static inline bool file_thp_enabled(struct vm_area_struct *vma)
	177	{
	178	struct inode *inode;
	179
	180	if (!vma->vm_file)
	181	return false;
	182
	183	inode = vma->vm_file->f_inode;
	184
	185	return (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS)) &&
	186	(vma->vm_flags & VM_EXEC) &&
	187	!inode_is_open_for_write(inode) && S_ISREG(inode->i_mode);
	188	}
	189
e6be37b2	190	bool transparent_hugepage_active(struct vm_area_struct *vma);
43675e6f	191
79da5407 KS	192	#define transparent_hugepage_use_zero_page() \
	193	(transparent_hugepage_flags & \
	194	(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
71e3aac0	195
ebfe1b8f RC	196	unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
ebfe1b8f RC	197	unsigned long len, unsigned long pgoff, unsigned long flags);
74d2fad1	198
ebfe1b8f RC	199	void prep_transhuge_page(struct page *page);
ebfe1b8f RC	200	void free_transhuge_page(struct page *page);
9a982250	201
d4b4084a	202	bool can_split_folio(struct folio folio, int pextra_pins);
e9b61f19 KS	203	int split_huge_page_to_list(struct page page, struct list_head list);
	204	static inline int split_huge_page(struct page *page)
	205	{
	206	return split_huge_page_to_list(page, NULL);
	207	}
9a982250	208	void deferred_split_huge_page(struct page *page);
eef1b3ba KS	209
eef1b3ba KS	210	void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
af28a988	211	unsigned long address, bool freeze, struct folio *folio);
eef1b3ba KS	212
	213	#define split_huge_pmd(__vma, __pmd, __address) \
	214	do { \
	215	pmd_t *____pmd = (__pmd); \
84c3fc4e	216	if (is_swap_pmd(____pmd) \|\| pmd_trans_huge(____pmd) \
5c7fb56e	217	\|\| pmd_devmap(*____pmd)) \
fec89c10	218	__split_huge_pmd(__vma, __pmd, __address, \
33f4751e	219	false, NULL); \
eef1b3ba	220	} while (0)
ad0bed24	221
2a52bcbc	222
fec89c10	223	void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
af28a988	224	bool freeze, struct folio *folio);
2a52bcbc	225
a00cc7d9 MW	226	void __split_huge_pud(struct vm_area_struct vma, pud_t pud,
	227	unsigned long address);
	228
	229	#define split_huge_pud(__vma, __pud, __address) \
	230	do { \
	231	pud_t *____pud = (__pud); \
	232	if (pud_trans_huge(*____pud) \
	233	\|\| pud_devmap(*____pud)) \
	234	__split_huge_pud(__vma, __pud, __address); \
	235	} while (0)
	236
ebfe1b8f RC	237	int hugepage_madvise(struct vm_area_struct vma, unsigned long vm_flags,
	238	int advice);
	239	void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start,
	240	unsigned long end, long adjust_next);
	241	spinlock_t __pmd_trans_huge_lock(pmd_t pmd, struct vm_area_struct *vma);
	242	spinlock_t __pud_trans_huge_lock(pud_t pud, struct vm_area_struct *vma);
84c3fc4e ZY	243
	244	static inline int is_swap_pmd(pmd_t pmd)
	245	{
	246	return !pmd_none(pmd) && !pmd_present(pmd);
	247	}
	248
c1e8d7c6	249	/* mmap_lock must be held on entry */
b6ec57f4 KS	250	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	251	struct vm_area_struct *vma)
025c5b24	252	{
84c3fc4e	253	if (is_swap_pmd(pmd) \|\| pmd_trans_huge(pmd) \|\| pmd_devmap(*pmd))
b6ec57f4	254	return __pmd_trans_huge_lock(pmd, vma);
025c5b24	255	else
969e8d7e	256	return NULL;
025c5b24	257	}
a00cc7d9 MW	258	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	259	struct vm_area_struct *vma)
	260	{
a00cc7d9 MW	261	if (pud_trans_huge(pud) \|\| pud_devmap(pud))
	262	return __pud_trans_huge_lock(pud, vma);
	263	else
	264	return NULL;
	265	}
6ffbb458	266
5bf34d7c MWO	267	/**
	268	* folio_test_pmd_mappable - Can we map this folio with a PMD?
	269	* @folio: The folio to test
	270	*/
	271	static inline bool folio_test_pmd_mappable(struct folio *folio)
	272	{
	273	return folio_order(folio) >= HPAGE_PMD_ORDER;
	274	}
	275
a00cc7d9	276	struct page follow_devmap_pmd(struct vm_area_struct vma, unsigned long addr,
df06b37f	277	pmd_t pmd, int flags, struct dev_pagemap *pgmap);
a00cc7d9	278	struct page follow_devmap_pud(struct vm_area_struct vma, unsigned long addr,
df06b37f	279	pud_t pud, int flags, struct dev_pagemap *pgmap);
a00cc7d9	280
5db4f15c	281	vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf);
d10e63f2	282
56873f43	283	extern struct page *huge_zero_page;
3b77e8c8	284	extern unsigned long huge_zero_pfn;
56873f43 WY	285
	286	static inline bool is_huge_zero_page(struct page *page)
	287	{
6aa7de05	288	return READ_ONCE(huge_zero_page) == page;
56873f43 WY	289	}
56873f43 WY	290
fc437044 MW	291	static inline bool is_huge_zero_pmd(pmd_t pmd)
fc437044 MW	292	{
3b77e8c8	293	return READ_ONCE(huge_zero_pfn) == pmd_pfn(pmd) && pmd_present(pmd);
fc437044 MW	294	}
fc437044 MW	295
a00cc7d9 MW	296	static inline bool is_huge_zero_pud(pud_t pud)
	297	{
	298	return false;
	299	}
	300
6fcb52a5 AL	301	struct page mm_get_huge_zero_page(struct mm_struct mm);
6fcb52a5 AL	302	void mm_put_huge_zero_page(struct mm_struct *mm);
fc437044	303
10102459 KS	304	#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
10102459 KS	305
9c670ea3 NH	306	static inline bool thp_migration_supported(void)
	307	{
	308	return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
	309	}
	310
87eaceb3 YS	311	static inline struct list_head page_deferred_list(struct page page)
	312	{
	313	/*
	314	* Global or memcg deferred list in the second tail pages is
	315	* occupied by compound_head.
	316	*/
	317	return &page[2].deferred_list;
	318	}
	319
71e3aac0	320	#else /* CONFIG_TRANSPARENT_HUGEPAGE */
d8c37c48 NH	321	#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
	322	#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
	323	#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
71e3aac0	324
a00cc7d9 MW	325	#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
	326	#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
	327	#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
	328
5bf34d7c MWO	329	static inline bool folio_test_pmd_mappable(struct folio *folio)
	330	{
	331	return false;
	332	}
	333
7635d9cb MH	334	static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
	335	{
	336	return false;
	337	}
	338
e6be37b2	339	static inline bool transparent_hugepage_active(struct vm_area_struct *vma)
16981d76 DW	340	{
	341	return false;
	342	}
71e3aac0	343
43675e6f YS	344	static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
	345	unsigned long haddr)
	346	{
	347	return false;
	348	}
	349
e6be37b2 ML	350	static inline bool transhuge_vma_enabled(struct vm_area_struct *vma,
	351	unsigned long vm_flags)
	352	{
	353	return false;
	354	}
	355
800d8c63 KS	356	static inline void prep_transhuge_page(struct page *page) {}
800d8c63 KS	357
71e3aac0	358	#define transparent_hugepage_flags 0UL
74d2fad1 TK	359
	360	#define thp_get_unmapped_area NULL
	361
b8f593cd	362	static inline bool
d4b4084a	363	can_split_folio(struct folio folio, int pextra_pins)
b8f593cd	364	{
b8f593cd HY	365	return false;
b8f593cd HY	366	}
5bc7b8ac SL	367	static inline int
	368	split_huge_page_to_list(struct page page, struct list_head list)
	369	{
	370	return 0;
	371	}
71e3aac0 AA	372	static inline int split_huge_page(struct page *page)
	373	{
	374	return 0;
	375	}
9a982250	376	static inline void deferred_split_huge_page(struct page *page) {}
78ddc534	377	#define split_huge_pmd(__vma, __pmd, __address) \
e180377f	378	do { } while (0)
2a52bcbc	379
fd60775a	380	static inline void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
af28a988	381	unsigned long address, bool freeze, struct folio *folio) {}
2a52bcbc	382	static inline void split_huge_pmd_address(struct vm_area_struct *vma,
af28a988	383	unsigned long address, bool freeze, struct folio *folio) {}
2a52bcbc	384
a00cc7d9 MW	385	#define split_huge_pud(__vma, __pmd, __address) \
	386	do { } while (0)
	387
60ab3244 AA	388	static inline int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	389	unsigned long *vm_flags, int advice)
0af4e98b AA	390	{
	391	BUG();
	392	return 0;
	393	}
94fcc585 AA	394	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	395	unsigned long start,
	396	unsigned long end,
	397	long adjust_next)
	398	{
	399	}
84c3fc4e ZY	400	static inline int is_swap_pmd(pmd_t pmd)
	401	{
	402	return 0;
	403	}
b6ec57f4 KS	404	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	405	struct vm_area_struct *vma)
025c5b24	406	{
b6ec57f4	407	return NULL;
025c5b24	408	}
a00cc7d9 MW	409	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	410	struct vm_area_struct *vma)
	411	{
	412	return NULL;
	413	}
d10e63f2	414
5db4f15c	415	static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf)
d10e63f2	416	{
4daae3b4	417	return 0;
d10e63f2 MG	418	}
d10e63f2 MG	419
56873f43 WY	420	static inline bool is_huge_zero_page(struct page *page)
	421	{
	422	return false;
	423	}
	424
3b77e8c8 HD	425	static inline bool is_huge_zero_pmd(pmd_t pmd)
	426	{
	427	return false;
	428	}
	429
a00cc7d9 MW	430	static inline bool is_huge_zero_pud(pud_t pud)
	431	{
	432	return false;
	433	}
	434
6fcb52a5	435	static inline void mm_put_huge_zero_page(struct mm_struct *mm)
aa88b68c	436	{
6fcb52a5	437	return;
aa88b68c	438	}
3565fce3 DW	439
3565fce3 DW	440	static inline struct page follow_devmap_pmd(struct vm_area_struct vma,
df06b37f	441	unsigned long addr, pmd_t pmd, int flags, struct dev_pagemap *pgmap)
3565fce3 DW	442	{
	443	return NULL;
	444	}
a00cc7d9 MW	445
a00cc7d9 MW	446	static inline struct page follow_devmap_pud(struct vm_area_struct vma,
df06b37f	447	unsigned long addr, pud_t pud, int flags, struct dev_pagemap *pgmap)
a00cc7d9 MW	448	{
	449	return NULL;
	450	}
9c670ea3 NH	451
	452	static inline bool thp_migration_supported(void)
	453	{
	454	return false;
	455	}
71e3aac0 AA	456	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
71e3aac0 AA	457
346cf613 MWO	458	static inline int split_folio_to_list(struct folio *folio,
	459	struct list_head *list)
	460	{
	461	return split_huge_page_to_list(&folio->page, list);
	462	}
	463
71e3aac0	464	#endif /* _LINUX_HUGE_MM_H */