[mirror_ubuntu-jammy-kernel.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);

#define HPAGE_CACHE_INDEX_MASK (HPAGE_PMD_NR - 1)

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 (((vma->vm_start >> PAGE_SHIFT) & HPAGE_CACHE_INDEX_MASK) !=
			(vma->vm_pgoff & HPAGE_CACHE_INDEX_MASK))
			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;

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 is_huge_zero_page(pmd_page(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_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	#define HPAGE_CACHE_INDEX_MASK (HPAGE_PMD_NR - 1)
	156
	157	static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
	158	unsigned long haddr)
	159	{
	160	/* Don't have to check pgoff for anonymous vma */
	161	if (!vma_is_anonymous(vma)) {
	162	if (((vma->vm_start >> PAGE_SHIFT) & HPAGE_CACHE_INDEX_MASK) !=
	163	(vma->vm_pgoff & HPAGE_CACHE_INDEX_MASK))
	164	return false;
	165	}
	166
	167	if (haddr < vma->vm_start \|\| haddr + HPAGE_PMD_SIZE > vma->vm_end)
	168	return false;
	169	return true;
	170	}
	171
79da5407 KS	172	#define transparent_hugepage_use_zero_page() \
	173	(transparent_hugepage_flags & \
	174	(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
71e3aac0	175
ebfe1b8f RC	176	unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
ebfe1b8f RC	177	unsigned long len, unsigned long pgoff, unsigned long flags);
74d2fad1	178
ebfe1b8f RC	179	void prep_transhuge_page(struct page *page);
ebfe1b8f RC	180	void free_transhuge_page(struct page *page);
005ba37c	181	bool is_transparent_hugepage(struct page *page);
9a982250	182
b8f593cd	183	bool can_split_huge_page(struct page page, int pextra_pins);
e9b61f19 KS	184	int split_huge_page_to_list(struct page page, struct list_head list);
	185	static inline int split_huge_page(struct page *page)
	186	{
	187	return split_huge_page_to_list(page, NULL);
	188	}
9a982250	189	void deferred_split_huge_page(struct page *page);
eef1b3ba KS	190
eef1b3ba KS	191	void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
33f4751e	192	unsigned long address, bool freeze, struct page *page);
eef1b3ba KS	193
	194	#define split_huge_pmd(__vma, __pmd, __address) \
	195	do { \
	196	pmd_t *____pmd = (__pmd); \
84c3fc4e	197	if (is_swap_pmd(____pmd) \|\| pmd_trans_huge(____pmd) \
5c7fb56e	198	\|\| pmd_devmap(*____pmd)) \
fec89c10	199	__split_huge_pmd(__vma, __pmd, __address, \
33f4751e	200	false, NULL); \
eef1b3ba	201	} while (0)
ad0bed24	202
2a52bcbc	203
fec89c10 KS	204	void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
fec89c10 KS	205	bool freeze, struct page *page);
2a52bcbc	206
a00cc7d9 MW	207	void __split_huge_pud(struct vm_area_struct vma, pud_t pud,
	208	unsigned long address);
	209
	210	#define split_huge_pud(__vma, __pud, __address) \
	211	do { \
	212	pud_t *____pud = (__pud); \
	213	if (pud_trans_huge(*____pud) \
	214	\|\| pud_devmap(*____pud)) \
	215	__split_huge_pud(__vma, __pud, __address); \
	216	} while (0)
	217
ebfe1b8f RC	218	int hugepage_madvise(struct vm_area_struct vma, unsigned long vm_flags,
	219	int advice);
	220	void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start,
	221	unsigned long end, long adjust_next);
	222	spinlock_t __pmd_trans_huge_lock(pmd_t pmd, struct vm_area_struct *vma);
	223	spinlock_t __pud_trans_huge_lock(pud_t pud, struct vm_area_struct *vma);
84c3fc4e ZY	224
	225	static inline int is_swap_pmd(pmd_t pmd)
	226	{
	227	return !pmd_none(pmd) && !pmd_present(pmd);
	228	}
	229
c1e8d7c6	230	/* mmap_lock must be held on entry */
b6ec57f4 KS	231	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	232	struct vm_area_struct *vma)
025c5b24	233	{
84c3fc4e	234	if (is_swap_pmd(pmd) \|\| pmd_trans_huge(pmd) \|\| pmd_devmap(*pmd))
b6ec57f4	235	return __pmd_trans_huge_lock(pmd, vma);
025c5b24	236	else
969e8d7e	237	return NULL;
025c5b24	238	}
a00cc7d9 MW	239	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	240	struct vm_area_struct *vma)
	241	{
a00cc7d9 MW	242	if (pud_trans_huge(pud) \|\| pud_devmap(pud))
	243	return __pud_trans_huge_lock(pud, vma);
	244	else
	245	return NULL;
	246	}
6ffbb458	247
2be1d718 MWO	248	/**
	249	* thp_head - Head page of a transparent huge page.
	250	* @page: Any page (tail, head or regular) found in the page cache.
	251	*/
	252	static inline struct page thp_head(struct page page)
	253	{
	254	return compound_head(page);
	255	}
	256
6ffbb458 MWO	257	/**
	258	* thp_order - Order of a transparent huge page.
	259	* @page: Head page of a transparent huge page.
	260	*/
	261	static inline unsigned int thp_order(struct page *page)
	262	{
	263	VM_BUG_ON_PGFLAGS(PageTail(page), page);
	264	if (PageHead(page))
	265	return HPAGE_PMD_ORDER;
	266	return 0;
	267	}
	268
6c357848 MWO	269	/**
	270	* thp_nr_pages - The number of regular pages in this huge page.
	271	* @page: The head page of a huge page.
	272	*/
	273	static inline int thp_nr_pages(struct page *page)
2c888cfb	274	{
6c357848 MWO	275	VM_BUG_ON_PGFLAGS(PageTail(page), page);
6c357848 MWO	276	if (PageHead(page))
2c888cfb RR	277	return HPAGE_PMD_NR;
	278	return 1;
	279	}
d10e63f2	280
a00cc7d9	281	struct page follow_devmap_pmd(struct vm_area_struct vma, unsigned long addr,
df06b37f	282	pmd_t pmd, int flags, struct dev_pagemap *pgmap);
a00cc7d9	283	struct page follow_devmap_pud(struct vm_area_struct vma, unsigned long addr,
df06b37f	284	pud_t pud, int flags, struct dev_pagemap *pgmap);
a00cc7d9	285
ebfe1b8f	286	vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
d10e63f2	287
56873f43 WY	288	extern struct page *huge_zero_page;
	289
	290	static inline bool is_huge_zero_page(struct page *page)
	291	{
6aa7de05	292	return READ_ONCE(huge_zero_page) == page;
56873f43 WY	293	}
56873f43 WY	294
fc437044 MW	295	static inline bool is_huge_zero_pmd(pmd_t pmd)
	296	{
	297	return is_huge_zero_page(pmd_page(pmd));
	298	}
	299
a00cc7d9 MW	300	static inline bool is_huge_zero_pud(pud_t pud)
	301	{
	302	return false;
	303	}
	304
6fcb52a5 AL	305	struct page mm_get_huge_zero_page(struct mm_struct mm);
6fcb52a5 AL	306	void mm_put_huge_zero_page(struct mm_struct *mm);
fc437044	307
10102459 KS	308	#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
10102459 KS	309
9c670ea3 NH	310	static inline bool thp_migration_supported(void)
	311	{
	312	return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
	313	}
	314
87eaceb3 YS	315	static inline struct list_head page_deferred_list(struct page page)
	316	{
	317	/*
	318	* Global or memcg deferred list in the second tail pages is
	319	* occupied by compound_head.
	320	*/
	321	return &page[2].deferred_list;
	322	}
	323
71e3aac0	324	#else /* CONFIG_TRANSPARENT_HUGEPAGE */
d8c37c48 NH	325	#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
	326	#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
	327	#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
71e3aac0	328
a00cc7d9 MW	329	#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
	330	#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
	331	#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
	332
2be1d718 MWO	333	static inline struct page thp_head(struct page page)
	334	{
	335	VM_BUG_ON_PGFLAGS(PageTail(page), page);
	336	return page;
	337	}
	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
7635d9cb MH	351	static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
	352	{
	353	return false;
	354	}
	355
16981d76 DW	356	static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
	357	{
	358	return false;
	359	}
71e3aac0	360
43675e6f YS	361	static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
	362	unsigned long haddr)
	363	{
	364	return false;
	365	}
	366
800d8c63 KS	367	static inline void prep_transhuge_page(struct page *page) {}
800d8c63 KS	368
005ba37c SC	369	static inline bool is_transparent_hugepage(struct page *page)
	370	{
	371	return false;
	372	}
	373
71e3aac0	374	#define transparent_hugepage_flags 0UL
74d2fad1 TK	375
	376	#define thp_get_unmapped_area NULL
	377
b8f593cd HY	378	static inline bool
	379	can_split_huge_page(struct page page, int pextra_pins)
	380	{
	381	BUILD_BUG();
	382	return false;
	383	}
5bc7b8ac SL	384	static inline int
	385	split_huge_page_to_list(struct page page, struct list_head list)
	386	{
	387	return 0;
	388	}
71e3aac0 AA	389	static inline int split_huge_page(struct page *page)
	390	{
	391	return 0;
	392	}
9a982250	393	static inline void deferred_split_huge_page(struct page *page) {}
78ddc534	394	#define split_huge_pmd(__vma, __pmd, __address) \
e180377f	395	do { } while (0)
2a52bcbc	396
fd60775a DR	397	static inline void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
fd60775a DR	398	unsigned long address, bool freeze, struct page *page) {}
2a52bcbc	399	static inline void split_huge_pmd_address(struct vm_area_struct *vma,
fec89c10	400	unsigned long address, bool freeze, struct page *page) {}
2a52bcbc	401
a00cc7d9 MW	402	#define split_huge_pud(__vma, __pmd, __address) \
	403	do { } while (0)
	404
60ab3244 AA	405	static inline int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	406	unsigned long *vm_flags, int advice)
0af4e98b AA	407	{
	408	BUG();
	409	return 0;
	410	}
94fcc585 AA	411	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	412	unsigned long start,
	413	unsigned long end,
	414	long adjust_next)
	415	{
	416	}
84c3fc4e ZY	417	static inline int is_swap_pmd(pmd_t pmd)
	418	{
	419	return 0;
	420	}
b6ec57f4 KS	421	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	422	struct vm_area_struct *vma)
025c5b24	423	{
b6ec57f4	424	return NULL;
025c5b24	425	}
a00cc7d9 MW	426	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	427	struct vm_area_struct *vma)
	428	{
	429	return NULL;
	430	}
d10e63f2	431
2b740303 SJ	432	static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf,
2b740303 SJ	433	pmd_t orig_pmd)
d10e63f2	434	{
4daae3b4	435	return 0;
d10e63f2 MG	436	}
d10e63f2 MG	437
56873f43 WY	438	static inline bool is_huge_zero_page(struct page *page)
	439	{
	440	return false;
	441	}
	442
a00cc7d9 MW	443	static inline bool is_huge_zero_pud(pud_t pud)
	444	{
	445	return false;
	446	}
	447
6fcb52a5	448	static inline void mm_put_huge_zero_page(struct mm_struct *mm)
aa88b68c	449	{
6fcb52a5	450	return;
aa88b68c	451	}
3565fce3 DW	452
3565fce3 DW	453	static inline struct page follow_devmap_pmd(struct vm_area_struct vma,
df06b37f	454	unsigned long addr, pmd_t pmd, int flags, struct dev_pagemap *pgmap)
3565fce3 DW	455	{
	456	return NULL;
	457	}
a00cc7d9 MW	458
a00cc7d9 MW	459	static inline struct page follow_devmap_pud(struct vm_area_struct vma,
df06b37f	460	unsigned long addr, pud_t pud, int flags, struct dev_pagemap *pgmap)
a00cc7d9 MW	461	{
	462	return NULL;
	463	}
9c670ea3 NH	464
	465	static inline bool thp_migration_supported(void)
	466	{
	467	return false;
	468	}
71e3aac0 AA	469	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
71e3aac0 AA	470
af3bbc12 MWO	471	/**
	472	* thp_size - Size of a transparent huge page.
	473	* @page: Head page of a transparent huge page.
	474	*
	475	* Return: Number of bytes in this page.
	476	*/
	477	static inline unsigned long thp_size(struct page *page)
	478	{
	479	return PAGE_SIZE << thp_order(page);
	480	}
	481
71e3aac0	482	#endif /* _LINUX_HUGE_MM_H */