[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(struct vm_fault *vmf, pfn_t pfn, bool write);
vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, bool write);

enum transparent_hugepage_flag {
	TRANSPARENT_HUGEPAGE_UNSUPPORTED,
	TRANSPARENT_HUGEPAGE_FLAG,
	TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
	TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
	TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
	TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
	TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
	TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
	TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
};

struct kobject;
struct kobj_attribute;

ssize_t single_hugepage_flag_store(struct kobject *kobj,
				   struct kobj_attribute *attr,
				   const char *buf, size_t count,
				   enum transparent_hugepage_flag flag);
ssize_t single_hugepage_flag_show(struct kobject *kobj,
				  struct kobj_attribute *attr, char *buf,
				  enum transparent_hugepage_flag flag);
extern struct kobj_attribute shmem_enabled_attr;

#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)

#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define HPAGE_PMD_SHIFT PMD_SHIFT
#define HPAGE_PMD_SIZE	((1UL) << HPAGE_PMD_SHIFT)
#define HPAGE_PMD_MASK	(~(HPAGE_PMD_SIZE - 1))

#define HPAGE_PUD_SHIFT PUD_SHIFT
#define HPAGE_PUD_SIZE	((1UL) << HPAGE_PUD_SHIFT)
#define HPAGE_PUD_MASK	(~(HPAGE_PUD_SIZE - 1))

extern unsigned long transparent_hugepage_flags;

#define hugepage_flags_enabled()					       \
	(transparent_hugepage_flags &				       \
	 ((1<<TRANSPARENT_HUGEPAGE_FLAG) |		       \
	  (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)))
#define hugepage_flags_always()				\
	(transparent_hugepage_flags &			\
	 (1<<TRANSPARENT_HUGEPAGE_FLAG))

/*
 * Do the below checks:
 *   - For file vma, check if the linear page offset of vma is
 *     HPAGE_PMD_NR aligned within the file.  The hugepage is
 *     guaranteed to be hugepage-aligned within the file, but we must
 *     check that the PMD-aligned addresses in the VMA map to
 *     PMD-aligned offsets within the file, else the hugepage will
 *     not be PMD-mappable.
 *   - For all vmas, check if the haddr is in an aligned HPAGE_PMD_SIZE
 *     area.
 */
static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
		unsigned long addr)
{
	unsigned long haddr;

	/* Don't have to check pgoff for anonymous vma */
	if (!vma_is_anonymous(vma)) {
		if (!IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
				HPAGE_PMD_NR))
			return false;
	}

	haddr = addr & HPAGE_PMD_MASK;

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

static inline bool file_thp_enabled(struct vm_area_struct *vma)
{
	struct inode *inode;

	if (!vma->vm_file)
		return false;

	inode = vma->vm_file->f_inode;

	return (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS)) &&
	       (vma->vm_flags & VM_EXEC) &&
	       !inode_is_open_for_write(inode) && S_ISREG(inode->i_mode);
}

bool hugepage_vma_check(struct vm_area_struct *vma, unsigned long vm_flags,
			bool smaps, bool in_pf, bool enforce_sysfs);

#define transparent_hugepage_use_zero_page()				\
	(transparent_hugepage_flags &					\
	 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))

unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
		unsigned long len, unsigned long pgoff, unsigned long flags);

void prep_transhuge_page(struct page *page);
void free_transhuge_page(struct page *page);

bool can_split_folio(struct folio *folio, int *pextra_pins);
int split_huge_page_to_list(struct page *page, struct list_head *list);
static inline int split_huge_page(struct page *page)
{
	return split_huge_page_to_list(page, NULL);
}
void deferred_split_folio(struct folio *folio);

void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
		unsigned long address, bool freeze, struct folio *folio);

#define split_huge_pmd(__vma, __pmd, __address)				\
	do {								\
		pmd_t *____pmd = (__pmd);				\
		if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd)	\
					|| pmd_devmap(*____pmd))	\
			__split_huge_pmd(__vma, __pmd, __address,	\
						false, NULL);		\
	}  while (0)


void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
		bool freeze, struct folio *folio);

void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
		unsigned long address);

#define split_huge_pud(__vma, __pud, __address)				\
	do {								\
		pud_t *____pud = (__pud);				\
		if (pud_trans_huge(*____pud)				\
					|| pud_devmap(*____pud))	\
			__split_huge_pud(__vma, __pud, __address);	\
	}  while (0)

int hugepage_madvise(struct vm_area_struct *vma, unsigned long *vm_flags,
		     int advice);
int madvise_collapse(struct vm_area_struct *vma,
		     struct vm_area_struct **prev,
		     unsigned long start, unsigned long end);
void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start,
			   unsigned long end, long adjust_next);
spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma);
spinlock_t *__pud_trans_huge_lock(pud_t *pud, struct vm_area_struct *vma);

static inline int is_swap_pmd(pmd_t pmd)
{
	return !pmd_none(pmd) && !pmd_present(pmd);
}

/* mmap_lock must be held on entry */
static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
		struct vm_area_struct *vma)
{
	if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
		return __pmd_trans_huge_lock(pmd, vma);
	else
		return NULL;
}
static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
		struct vm_area_struct *vma)
{
	if (pud_trans_huge(*pud) || pud_devmap(*pud))
		return __pud_trans_huge_lock(pud, vma);
	else
		return NULL;
}

/**
 * folio_test_pmd_mappable - Can we map this folio with a PMD?
 * @folio: The folio to test
 */
static inline bool folio_test_pmd_mappable(struct folio *folio)
{
	return folio_order(folio) >= HPAGE_PMD_ORDER;
}

struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
		pmd_t *pmd, int flags, struct dev_pagemap **pgmap);
struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
		pud_t *pud, int flags, struct dev_pagemap **pgmap);

vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf);

extern struct page *huge_zero_page;
extern unsigned long huge_zero_pfn;

static inline bool is_huge_zero_page(struct page *page)
{
	return READ_ONCE(huge_zero_page) == page;
}

static inline bool is_huge_zero_pmd(pmd_t pmd)
{
	return pmd_present(pmd) && READ_ONCE(huge_zero_pfn) == pmd_pfn(pmd);
}

static inline bool is_huge_zero_pud(pud_t pud)
{
	return false;
}

struct page *mm_get_huge_zero_page(struct mm_struct *mm);
void mm_put_huge_zero_page(struct mm_struct *mm);

#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))

static inline bool thp_migration_supported(void)
{
	return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
}

#else /* CONFIG_TRANSPARENT_HUGEPAGE */
#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })

#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })

static inline bool folio_test_pmd_mappable(struct folio *folio)
{
	return false;
}

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

static inline bool hugepage_vma_check(struct vm_area_struct *vma,
				      unsigned long vm_flags, bool smaps,
				      bool in_pf, bool enforce_sysfs)
{
	return false;
}

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

#define transparent_hugepage_flags 0UL

#define thp_get_unmapped_area	NULL

static inline bool
can_split_folio(struct folio *folio, int *pextra_pins)
{
	return false;
}
static inline int
split_huge_page_to_list(struct page *page, struct list_head *list)
{
	return 0;
}
static inline int split_huge_page(struct page *page)
{
	return 0;
}
static inline void deferred_split_folio(struct folio *folio) {}
#define split_huge_pmd(__vma, __pmd, __address)	\
	do { } while (0)

static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
		unsigned long address, bool freeze, struct folio *folio) {}
static inline void split_huge_pmd_address(struct vm_area_struct *vma,
		unsigned long address, bool freeze, struct folio *folio) {}

#define split_huge_pud(__vma, __pmd, __address)	\
	do { } while (0)

static inline int hugepage_madvise(struct vm_area_struct *vma,
				   unsigned long *vm_flags, int advice)
{
	return -EINVAL;
}

static inline int madvise_collapse(struct vm_area_struct *vma,
				   struct vm_area_struct **prev,
				   unsigned long start, unsigned long end)
{
	return -EINVAL;
}

static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
					 unsigned long start,
					 unsigned long end,
					 long adjust_next)
{
}
static inline int is_swap_pmd(pmd_t pmd)
{
	return 0;
}
static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
		struct vm_area_struct *vma)
{
	return NULL;
}
static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
		struct vm_area_struct *vma)
{
	return NULL;
}

static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf)
{
	return 0;
}

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

static inline bool is_huge_zero_pmd(pmd_t pmd)
{
	return false;
}

static inline bool is_huge_zero_pud(pud_t pud)
{
	return false;
}

static inline void mm_put_huge_zero_page(struct mm_struct *mm)
{
	return;
}

static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
	unsigned long addr, pmd_t *pmd, int flags, struct dev_pagemap **pgmap)
{
	return NULL;
}

static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
	unsigned long addr, pud_t *pud, int flags, struct dev_pagemap **pgmap)
{
	return NULL;
}

static inline bool thp_migration_supported(void)
{
	return false;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */

static inline int split_folio_to_list(struct folio *folio,
		struct list_head *list)
{
	return split_huge_page_to_list(&folio->page, list);
}

static inline int split_folio(struct folio *folio)
{
	return split_folio_to_list(folio, NULL);
}

/*
 * archs that select ARCH_WANTS_THP_SWAP but don't support THP_SWP due to
 * limitations in the implementation like arm64 MTE can override this to
 * false
 */
#ifndef arch_thp_swp_supported
static inline bool arch_thp_swp_supported(void)
{
	return true;
}
#endif

#endif /* _LINUX_HUGE_MM_H */
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	42
7b806d22 LS	43	vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, bool write);
7b806d22 LS	44	vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, bool write);
9a9731b1	45
71e3aac0	46	enum transparent_hugepage_flag {
3c556d24	47	TRANSPARENT_HUGEPAGE_UNSUPPORTED,
71e3aac0 AA	48	TRANSPARENT_HUGEPAGE_FLAG,
71e3aac0 AA	49	TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
444eb2a4 MG	50	TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
444eb2a4 MG	51	TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
21440d7e	52	TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
71e3aac0	53	TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
ba76149f	54	TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
79da5407	55	TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
71e3aac0 AA	56	};
71e3aac0 AA	57
b46e756f KS	58	struct kobject;
	59	struct kobj_attribute;
	60
ebfe1b8f RC	61	ssize_t single_hugepage_flag_store(struct kobject *kobj,
	62	struct kobj_attribute *attr,
	63	const char *buf, size_t count,
	64	enum transparent_hugepage_flag flag);
	65	ssize_t single_hugepage_flag_show(struct kobject *kobj,
	66	struct kobj_attribute attr, char buf,
	67	enum transparent_hugepage_flag flag);
5a6e75f8 KS	68	extern struct kobj_attribute shmem_enabled_attr;
5a6e75f8 KS	69
d8c37c48 NH	70	#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
	71	#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
	72
71e3aac0	73	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
fde52796 AK	74	#define HPAGE_PMD_SHIFT PMD_SHIFT
	75	#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
	76	#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
71e3aac0	77
a00cc7d9 MW	78	#define HPAGE_PUD_SHIFT PUD_SHIFT
	79	#define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
	80	#define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
	81
16981d76 DW	82	extern unsigned long transparent_hugepage_flags;
16981d76 DW	83
1064026b YS	84	#define hugepage_flags_enabled() \
	85	(transparent_hugepage_flags & \
	86	((1<<TRANSPARENT_HUGEPAGE_FLAG) \| \
	87	(1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)))
	88	#define hugepage_flags_always() \
	89	(transparent_hugepage_flags & \
	90	(1<<TRANSPARENT_HUGEPAGE_FLAG))
	91
4fa6893f YS	92	/*
	93	* Do the below checks:
	94	* - For file vma, check if the linear page offset of vma is
	95	* HPAGE_PMD_NR aligned within the file. The hugepage is
	96	* guaranteed to be hugepage-aligned within the file, but we must
	97	* check that the PMD-aligned addresses in the VMA map to
	98	* PMD-aligned offsets within the file, else the hugepage will
	99	* not be PMD-mappable.
	100	* - For all vmas, check if the haddr is in an aligned HPAGE_PMD_SIZE
	101	* area.
	102	*/
e6be37b2	103	static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
c453d8c7	104	unsigned long addr)
e6be37b2	105	{
c453d8c7 YS	106	unsigned long haddr;
c453d8c7 YS	107
e6be37b2 ML	108	/* Don't have to check pgoff for anonymous vma */
	109	if (!vma_is_anonymous(vma)) {
	110	if (!IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
	111	HPAGE_PMD_NR))
	112	return false;
	113	}
	114
c453d8c7	115	haddr = addr & HPAGE_PMD_MASK;
e6be37b2	116
e6be37b2	117	if (haddr < vma->vm_start \|\| haddr + HPAGE_PMD_SIZE > vma->vm_end)
e6be37b2 ML	118	return false;
	119	return true;
	120	}
	121
78d12c19 YS	122	static inline bool file_thp_enabled(struct vm_area_struct *vma)
	123	{
	124	struct inode *inode;
	125
	126	if (!vma->vm_file)
	127	return false;
	128
	129	inode = vma->vm_file->f_inode;
	130
	131	return (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS)) &&
	132	(vma->vm_flags & VM_EXEC) &&
	133	!inode_is_open_for_write(inode) && S_ISREG(inode->i_mode);
	134	}
	135
a7f4e6e4 ZK	136	bool hugepage_vma_check(struct vm_area_struct *vma, unsigned long vm_flags,
a7f4e6e4 ZK	137	bool smaps, bool in_pf, bool enforce_sysfs);
43675e6f	138
79da5407 KS	139	#define transparent_hugepage_use_zero_page() \
	140	(transparent_hugepage_flags & \
	141	(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
71e3aac0	142
ebfe1b8f RC	143	unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
ebfe1b8f RC	144	unsigned long len, unsigned long pgoff, unsigned long flags);
74d2fad1	145
ebfe1b8f RC	146	void prep_transhuge_page(struct page *page);
ebfe1b8f RC	147	void free_transhuge_page(struct page *page);
9a982250	148
d4b4084a	149	bool can_split_folio(struct folio folio, int pextra_pins);
e9b61f19 KS	150	int split_huge_page_to_list(struct page page, struct list_head list);
	151	static inline int split_huge_page(struct page *page)
	152	{
	153	return split_huge_page_to_list(page, NULL);
	154	}
f158ed61	155	void deferred_split_folio(struct folio *folio);
eef1b3ba KS	156
eef1b3ba KS	157	void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
af28a988	158	unsigned long address, bool freeze, struct folio *folio);
eef1b3ba KS	159
	160	#define split_huge_pmd(__vma, __pmd, __address) \
	161	do { \
	162	pmd_t *____pmd = (__pmd); \
84c3fc4e	163	if (is_swap_pmd(____pmd) \|\| pmd_trans_huge(____pmd) \
5c7fb56e	164	\|\| pmd_devmap(*____pmd)) \
fec89c10	165	__split_huge_pmd(__vma, __pmd, __address, \
33f4751e	166	false, NULL); \
eef1b3ba	167	} while (0)
ad0bed24	168
2a52bcbc	169
fec89c10	170	void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
af28a988	171	bool freeze, struct folio *folio);
2a52bcbc	172
a00cc7d9 MW	173	void __split_huge_pud(struct vm_area_struct vma, pud_t pud,
	174	unsigned long address);
	175
	176	#define split_huge_pud(__vma, __pud, __address) \
	177	do { \
	178	pud_t *____pud = (__pud); \
	179	if (pud_trans_huge(*____pud) \
	180	\|\| pud_devmap(*____pud)) \
	181	__split_huge_pud(__vma, __pud, __address); \
	182	} while (0)
	183
ebfe1b8f RC	184	int hugepage_madvise(struct vm_area_struct vma, unsigned long vm_flags,
ebfe1b8f RC	185	int advice);
7d8faaf1 ZK	186	int madvise_collapse(struct vm_area_struct *vma,
	187	struct vm_area_struct **prev,
	188	unsigned long start, unsigned long end);
ebfe1b8f RC	189	void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start,
	190	unsigned long end, long adjust_next);
	191	spinlock_t __pmd_trans_huge_lock(pmd_t pmd, struct vm_area_struct *vma);
	192	spinlock_t __pud_trans_huge_lock(pud_t pud, struct vm_area_struct *vma);
84c3fc4e ZY	193
	194	static inline int is_swap_pmd(pmd_t pmd)
	195	{
	196	return !pmd_none(pmd) && !pmd_present(pmd);
	197	}
	198
c1e8d7c6	199	/* mmap_lock must be held on entry */
b6ec57f4 KS	200	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	201	struct vm_area_struct *vma)
025c5b24	202	{
84c3fc4e	203	if (is_swap_pmd(pmd) \|\| pmd_trans_huge(pmd) \|\| pmd_devmap(*pmd))
b6ec57f4	204	return __pmd_trans_huge_lock(pmd, vma);
025c5b24	205	else
969e8d7e	206	return NULL;
025c5b24	207	}
a00cc7d9 MW	208	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	209	struct vm_area_struct *vma)
	210	{
a00cc7d9 MW	211	if (pud_trans_huge(pud) \|\| pud_devmap(pud))
	212	return __pud_trans_huge_lock(pud, vma);
	213	else
	214	return NULL;
	215	}
6ffbb458	216
5bf34d7c MWO	217	/**
	218	* folio_test_pmd_mappable - Can we map this folio with a PMD?
	219	* @folio: The folio to test
	220	*/
	221	static inline bool folio_test_pmd_mappable(struct folio *folio)
	222	{
	223	return folio_order(folio) >= HPAGE_PMD_ORDER;
	224	}
	225
a00cc7d9	226	struct page follow_devmap_pmd(struct vm_area_struct vma, unsigned long addr,
df06b37f	227	pmd_t pmd, int flags, struct dev_pagemap *pgmap);
a00cc7d9	228	struct page follow_devmap_pud(struct vm_area_struct vma, unsigned long addr,
df06b37f	229	pud_t pud, int flags, struct dev_pagemap *pgmap);
a00cc7d9	230
5db4f15c	231	vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf);
d10e63f2	232
56873f43	233	extern struct page *huge_zero_page;
3b77e8c8	234	extern unsigned long huge_zero_pfn;
56873f43 WY	235
	236	static inline bool is_huge_zero_page(struct page *page)
	237	{
6aa7de05	238	return READ_ONCE(huge_zero_page) == page;
56873f43 WY	239	}
56873f43 WY	240
fc437044 MW	241	static inline bool is_huge_zero_pmd(pmd_t pmd)
fc437044 MW	242	{
3ce4fee4	243	return pmd_present(pmd) && READ_ONCE(huge_zero_pfn) == pmd_pfn(pmd);
fc437044 MW	244	}
fc437044 MW	245
a00cc7d9 MW	246	static inline bool is_huge_zero_pud(pud_t pud)
	247	{
	248	return false;
	249	}
	250
6fcb52a5 AL	251	struct page mm_get_huge_zero_page(struct mm_struct mm);
6fcb52a5 AL	252	void mm_put_huge_zero_page(struct mm_struct *mm);
fc437044	253
10102459 KS	254	#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
10102459 KS	255
9c670ea3 NH	256	static inline bool thp_migration_supported(void)
	257	{
	258	return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
	259	}
	260
71e3aac0	261	#else /* CONFIG_TRANSPARENT_HUGEPAGE */
d8c37c48 NH	262	#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
	263	#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
	264	#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
71e3aac0	265
a00cc7d9 MW	266	#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
	267	#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
	268	#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
	269
5bf34d7c MWO	270	static inline bool folio_test_pmd_mappable(struct folio *folio)
	271	{
	272	return false;
	273	}
	274
43675e6f	275	static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
c453d8c7	276	unsigned long addr)
43675e6f YS	277	{
	278	return false;
	279	}
	280
9fec5168	281	static inline bool hugepage_vma_check(struct vm_area_struct *vma,
a7f4e6e4 ZK	282	unsigned long vm_flags, bool smaps,
a7f4e6e4 ZK	283	bool in_pf, bool enforce_sysfs)
e6be37b2 ML	284	{
	285	return false;
	286	}
	287
800d8c63 KS	288	static inline void prep_transhuge_page(struct page *page) {}
800d8c63 KS	289
71e3aac0	290	#define transparent_hugepage_flags 0UL
74d2fad1 TK	291
	292	#define thp_get_unmapped_area NULL
	293
b8f593cd	294	static inline bool
d4b4084a	295	can_split_folio(struct folio folio, int pextra_pins)
b8f593cd	296	{
b8f593cd HY	297	return false;
b8f593cd HY	298	}
5bc7b8ac SL	299	static inline int
	300	split_huge_page_to_list(struct page page, struct list_head list)
	301	{
	302	return 0;
	303	}
71e3aac0 AA	304	static inline int split_huge_page(struct page *page)
	305	{
	306	return 0;
	307	}
f158ed61	308	static inline void deferred_split_folio(struct folio *folio) {}
78ddc534	309	#define split_huge_pmd(__vma, __pmd, __address) \
e180377f	310	do { } while (0)
2a52bcbc	311
fd60775a	312	static inline void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
af28a988	313	unsigned long address, bool freeze, struct folio *folio) {}
2a52bcbc	314	static inline void split_huge_pmd_address(struct vm_area_struct *vma,
af28a988	315	unsigned long address, bool freeze, struct folio *folio) {}
2a52bcbc	316
a00cc7d9 MW	317	#define split_huge_pud(__vma, __pmd, __address) \
	318	do { } while (0)
	319
60ab3244 AA	320	static inline int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	321	unsigned long *vm_flags, int advice)
0af4e98b	322	{
7d8faaf1	323	return -EINVAL;
0af4e98b	324	}
7d8faaf1 ZK	325
	326	static inline int madvise_collapse(struct vm_area_struct *vma,
	327	struct vm_area_struct **prev,
	328	unsigned long start, unsigned long end)
	329	{
	330	return -EINVAL;
	331	}
	332
94fcc585 AA	333	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	334	unsigned long start,
	335	unsigned long end,
	336	long adjust_next)
	337	{
	338	}
84c3fc4e ZY	339	static inline int is_swap_pmd(pmd_t pmd)
	340	{
	341	return 0;
	342	}
b6ec57f4 KS	343	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	344	struct vm_area_struct *vma)
025c5b24	345	{
b6ec57f4	346	return NULL;
025c5b24	347	}
a00cc7d9 MW	348	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	349	struct vm_area_struct *vma)
	350	{
	351	return NULL;
	352	}
d10e63f2	353
5db4f15c	354	static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf)
d10e63f2	355	{
4daae3b4	356	return 0;
d10e63f2 MG	357	}
d10e63f2 MG	358
56873f43 WY	359	static inline bool is_huge_zero_page(struct page *page)
	360	{
	361	return false;
	362	}
	363
3b77e8c8 HD	364	static inline bool is_huge_zero_pmd(pmd_t pmd)
	365	{
	366	return false;
	367	}
	368
a00cc7d9 MW	369	static inline bool is_huge_zero_pud(pud_t pud)
	370	{
	371	return false;
	372	}
	373
6fcb52a5	374	static inline void mm_put_huge_zero_page(struct mm_struct *mm)
aa88b68c	375	{
6fcb52a5	376	return;
aa88b68c	377	}
3565fce3 DW	378
3565fce3 DW	379	static inline struct page follow_devmap_pmd(struct vm_area_struct vma,
df06b37f	380	unsigned long addr, pmd_t pmd, int flags, struct dev_pagemap *pgmap)
3565fce3 DW	381	{
	382	return NULL;
	383	}
a00cc7d9 MW	384
a00cc7d9 MW	385	static inline struct page follow_devmap_pud(struct vm_area_struct vma,
df06b37f	386	unsigned long addr, pud_t pud, int flags, struct dev_pagemap *pgmap)
a00cc7d9 MW	387	{
	388	return NULL;
	389	}
9c670ea3 NH	390
	391	static inline bool thp_migration_supported(void)
	392	{
	393	return false;
	394	}
71e3aac0 AA	395	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
71e3aac0 AA	396
346cf613 MWO	397	static inline int split_folio_to_list(struct folio *folio,
	398	struct list_head *list)
	399	{
	400	return split_huge_page_to_list(&folio->page, list);
	401	}
	402
d788f5b3 MWO	403	static inline int split_folio(struct folio *folio)
	404	{
	405	return split_folio_to_list(folio, NULL);
	406	}
	407
d0637c50 BS	408	/*
	409	* archs that select ARCH_WANTS_THP_SWAP but don't support THP_SWP due to
	410	* limitations in the implementation like arm64 MTE can override this to
	411	* false
	412	*/
	413	#ifndef arch_thp_swp_supported
	414	static inline bool arch_thp_swp_supported(void)
	415	{
	416	return true;
	417	}
	418	#endif
	419
71e3aac0	420	#endif /* _LINUX_HUGE_MM_H */