[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() */

extern vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf);
extern 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);
extern void huge_pmd_set_accessed(struct vm_fault *vmf, pmd_t orig_pmd);
extern 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
extern 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

extern vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd);
extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
					  unsigned long addr,
					  pmd_t *pmd,
					  unsigned int flags);
extern bool madvise_free_huge_pmd(struct mmu_gather *tlb,
			struct vm_area_struct *vma,
			pmd_t *pmd, unsigned long addr, unsigned long next);
extern int zap_huge_pmd(struct mmu_gather *tlb,
			struct vm_area_struct *vma,
			pmd_t *pmd, unsigned long addr);
extern int zap_huge_pud(struct mmu_gather *tlb,
			struct vm_area_struct *vma,
			pud_t *pud, unsigned long addr);
extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
			unsigned long addr, unsigned long end,
			unsigned char *vec);
extern bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
			 unsigned long new_addr, unsigned long old_end,
			 pmd_t *old_pmd, pmd_t *new_pmd);
extern 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_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,
#ifdef CONFIG_DEBUG_VM
	TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
#endif
};

struct kobject;
struct kobj_attribute;

extern ssize_t single_hugepage_flag_store(struct kobject *kobj,
				 struct kobj_attribute *attr,
				 const char *buf, size_t count,
				 enum transparent_hugepage_flag flag);
extern 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 (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;
	/*
	 * For dax vmas, try to always use hugepage mappings. If the kernel does
	 * not support hugepages, fsdax mappings will fallback to PAGE_SIZE
	 * mappings, and device-dax namespaces, that try to guarantee a given
	 * mapping size, will fail to enable
	 */
	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))
#ifdef CONFIG_DEBUG_VM
#define transparent_hugepage_debug_cow()				\
	(transparent_hugepage_flags &					\
	 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
#else /* CONFIG_DEBUG_VM */
#define transparent_hugepage_debug_cow() 0
#endif /* CONFIG_DEBUG_VM */

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

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

extern int hugepage_madvise(struct vm_area_struct *vma,
			    unsigned long *vm_flags, int advice);
extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
				    unsigned long start,
				    unsigned long end,
				    long adjust_next);
extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
		struct vm_area_struct *vma);
extern 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;
}
static inline int hpage_nr_pages(struct page *page)
{
	if (unlikely(PageTransHuge(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);

extern 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 int hpage_nr_pages(struct page *page)
{
	VM_BUG_ON_PAGE(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 */

#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
2b740303	10	extern vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf);
71e3aac0 AA	11	extern 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);
82b0f8c3	14	extern void huge_pmd_set_accessed(struct vm_fault *vmf, pmd_t orig_pmd);
a00cc7d9 MW	15	extern 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);
	18
	19	#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
	20	extern void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud);
	21	#else
	22	static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud)
	23	{
	24	}
	25	#endif
	26
2b740303	27	extern vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd);
b676b293	28	extern struct page follow_trans_huge_pmd(struct vm_area_struct vma,
71e3aac0 AA	29	unsigned long addr,
	30	pmd_t *pmd,
	31	unsigned int flags);
319904ad	32	extern bool madvise_free_huge_pmd(struct mmu_gather *tlb,
b8d3c4c3 MK	33	struct vm_area_struct *vma,
b8d3c4c3 MK	34	pmd_t *pmd, unsigned long addr, unsigned long next);
71e3aac0 AA	35	extern int zap_huge_pmd(struct mmu_gather *tlb,
71e3aac0 AA	36	struct vm_area_struct *vma,
f21760b1	37	pmd_t *pmd, unsigned long addr);
a00cc7d9 MW	38	extern int zap_huge_pud(struct mmu_gather *tlb,
	39	struct vm_area_struct *vma,
	40	pud_t *pud, unsigned long addr);
0ca1634d JW	41	extern int mincore_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
	42	unsigned long addr, unsigned long end,
	43	unsigned char *vec);
bf8616d5	44	extern bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
37a1c49a	45	unsigned long new_addr, unsigned long old_end,
eb66ae03	46	pmd_t old_pmd, pmd_t new_pmd);
cd7548ab	47	extern int change_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
4b10e7d5	48	unsigned long addr, pgprot_t newprot,
58705444	49	unsigned long cp_flags);
9a9731b1 THV	50	vm_fault_t vmf_insert_pfn_pmd_prot(struct vm_fault *vmf, pfn_t pfn,
	51	pgprot_t pgprot, bool write);
	52
	53	/**
	54	* vmf_insert_pfn_pmd - insert a pmd size pfn
	55	* @vmf: Structure describing the fault
	56	* @pfn: pfn to insert
	57	* @pgprot: page protection to use
	58	* @write: whether it's a write fault
	59	*
	60	* Insert a pmd size pfn. See vmf_insert_pfn() for additional info.
	61	*
	62	* Return: vm_fault_t value.
	63	*/
	64	static inline vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn,
	65	bool write)
	66	{
	67	return vmf_insert_pfn_pmd_prot(vmf, pfn, vmf->vma->vm_page_prot, write);
	68	}
	69	vm_fault_t vmf_insert_pfn_pud_prot(struct vm_fault *vmf, pfn_t pfn,
	70	pgprot_t pgprot, bool write);
	71
	72	/**
	73	* vmf_insert_pfn_pud - insert a pud size pfn
	74	* @vmf: Structure describing the fault
	75	* @pfn: pfn to insert
	76	* @pgprot: page protection to use
	77	* @write: whether it's a write fault
	78	*
	79	* Insert a pud size pfn. See vmf_insert_pfn() for additional info.
	80	*
	81	* Return: vm_fault_t value.
	82	*/
	83	static inline vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn,
	84	bool write)
	85	{
	86	return vmf_insert_pfn_pud_prot(vmf, pfn, vmf->vma->vm_page_prot, write);
	87	}
	88
71e3aac0 AA	89	enum transparent_hugepage_flag {
	90	TRANSPARENT_HUGEPAGE_FLAG,
	91	TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
444eb2a4 MG	92	TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
444eb2a4 MG	93	TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
21440d7e	94	TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
71e3aac0	95	TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
ba76149f	96	TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
79da5407	97	TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
71e3aac0 AA	98	#ifdef CONFIG_DEBUG_VM
	99	TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
	100	#endif
	101	};
	102
b46e756f KS	103	struct kobject;
	104	struct kobj_attribute;
	105
	106	extern ssize_t single_hugepage_flag_store(struct kobject *kobj,
	107	struct kobj_attribute *attr,
	108	const char *buf, size_t count,
	109	enum transparent_hugepage_flag flag);
	110	extern ssize_t single_hugepage_flag_show(struct kobject *kobj,
	111	struct kobj_attribute attr, char buf,
	112	enum transparent_hugepage_flag flag);
5a6e75f8 KS	113	extern struct kobj_attribute shmem_enabled_attr;
5a6e75f8 KS	114
d8c37c48 NH	115	#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
	116	#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
	117
71e3aac0	118	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
fde52796 AK	119	#define HPAGE_PMD_SHIFT PMD_SHIFT
	120	#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
	121	#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
71e3aac0	122
a00cc7d9 MW	123	#define HPAGE_PUD_SHIFT PUD_SHIFT
	124	#define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
	125	#define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
	126
16981d76 DW	127	extern unsigned long transparent_hugepage_flags;
16981d76 DW	128
7635d9cb MH	129	/*
	130	* to be used on vmas which are known to support THP.
	131	* Use transparent_hugepage_enabled otherwise
	132	*/
	133	static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
16981d76 DW	134	{
	135	if (vma->vm_flags & VM_NOHUGEPAGE)
	136	return false;
	137
222100ee	138	if (vma_is_temporary_stack(vma))
16981d76 DW	139	return false;
	140
	141	if (test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
	142	return false;
	143
	144	if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
	145	return true;
f5376699 AK	146	/*
	147	* For dax vmas, try to always use hugepage mappings. If the kernel does
	148	* not support hugepages, fsdax mappings will fallback to PAGE_SIZE
	149	* mappings, and device-dax namespaces, that try to guarantee a given
	150	* mapping size, will fail to enable
	151	*/
baabda26 DW	152	if (vma_is_dax(vma))
	153	return true;
	154
16981d76 DW	155	if (transparent_hugepage_flags &
	156	(1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
	157	return !!(vma->vm_flags & VM_HUGEPAGE);
	158
	159	return false;
	160	}
	161
7635d9cb MH	162	bool transparent_hugepage_enabled(struct vm_area_struct *vma);
7635d9cb MH	163
43675e6f YS	164	#define HPAGE_CACHE_INDEX_MASK (HPAGE_PMD_NR - 1)
	165
	166	static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
	167	unsigned long haddr)
	168	{
	169	/* Don't have to check pgoff for anonymous vma */
	170	if (!vma_is_anonymous(vma)) {
	171	if (((vma->vm_start >> PAGE_SHIFT) & HPAGE_CACHE_INDEX_MASK) !=
	172	(vma->vm_pgoff & HPAGE_CACHE_INDEX_MASK))
	173	return false;
	174	}
	175
	176	if (haddr < vma->vm_start \|\| haddr + HPAGE_PMD_SIZE > vma->vm_end)
	177	return false;
	178	return true;
	179	}
	180
79da5407 KS	181	#define transparent_hugepage_use_zero_page() \
	182	(transparent_hugepage_flags & \
	183	(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
71e3aac0 AA	184	#ifdef CONFIG_DEBUG_VM
	185	#define transparent_hugepage_debug_cow() \
	186	(transparent_hugepage_flags & \
	187	(1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
	188	#else /* CONFIG_DEBUG_VM */
	189	#define transparent_hugepage_debug_cow() 0
	190	#endif /* CONFIG_DEBUG_VM */
	191
74d2fad1 TK	192	extern unsigned long thp_get_unmapped_area(struct file *filp,
	193	unsigned long addr, unsigned long len, unsigned long pgoff,
	194	unsigned long flags);
	195
9a982250 KS	196	extern void prep_transhuge_page(struct page *page);
9a982250 KS	197	extern void free_transhuge_page(struct page *page);
005ba37c	198	bool is_transparent_hugepage(struct page *page);
9a982250	199
b8f593cd	200	bool can_split_huge_page(struct page page, int pextra_pins);
e9b61f19 KS	201	int split_huge_page_to_list(struct page page, struct list_head list);
	202	static inline int split_huge_page(struct page *page)
	203	{
	204	return split_huge_page_to_list(page, NULL);
	205	}
9a982250	206	void deferred_split_huge_page(struct page *page);
eef1b3ba KS	207
eef1b3ba KS	208	void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
33f4751e	209	unsigned long address, bool freeze, struct page *page);
eef1b3ba KS	210
	211	#define split_huge_pmd(__vma, __pmd, __address) \
	212	do { \
	213	pmd_t *____pmd = (__pmd); \
84c3fc4e	214	if (is_swap_pmd(____pmd) \|\| pmd_trans_huge(____pmd) \
5c7fb56e	215	\|\| pmd_devmap(*____pmd)) \
fec89c10	216	__split_huge_pmd(__vma, __pmd, __address, \
33f4751e	217	false, NULL); \
eef1b3ba	218	} while (0)
ad0bed24	219
2a52bcbc	220
fec89c10 KS	221	void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
fec89c10 KS	222	bool freeze, struct page *page);
2a52bcbc	223
a00cc7d9 MW	224	void __split_huge_pud(struct vm_area_struct vma, pud_t pud,
	225	unsigned long address);
	226
	227	#define split_huge_pud(__vma, __pud, __address) \
	228	do { \
	229	pud_t *____pud = (__pud); \
	230	if (pud_trans_huge(*____pud) \
	231	\|\| pud_devmap(*____pud)) \
	232	__split_huge_pud(__vma, __pud, __address); \
	233	} while (0)
	234
60ab3244 AA	235	extern int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	236	unsigned long *vm_flags, int advice);
e1b9996b	237	extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
94fcc585 AA	238	unsigned long start,
	239	unsigned long end,
	240	long adjust_next);
b6ec57f4 KS	241	extern spinlock_t __pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	242	struct vm_area_struct *vma);
a00cc7d9 MW	243	extern spinlock_t __pud_trans_huge_lock(pud_t pud,
a00cc7d9 MW	244	struct vm_area_struct *vma);
84c3fc4e ZY	245
	246	static inline int is_swap_pmd(pmd_t pmd)
	247	{
	248	return !pmd_none(pmd) && !pmd_present(pmd);
	249	}
	250
c1e8d7c6	251	/* mmap_lock must be held on entry */
b6ec57f4 KS	252	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	253	struct vm_area_struct *vma)
025c5b24	254	{
84c3fc4e	255	if (is_swap_pmd(pmd) \|\| pmd_trans_huge(pmd) \|\| pmd_devmap(*pmd))
b6ec57f4	256	return __pmd_trans_huge_lock(pmd, vma);
025c5b24	257	else
969e8d7e	258	return NULL;
025c5b24	259	}
a00cc7d9 MW	260	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	261	struct vm_area_struct *vma)
	262	{
a00cc7d9 MW	263	if (pud_trans_huge(pud) \|\| pud_devmap(pud))
	264	return __pud_trans_huge_lock(pud, vma);
	265	else
	266	return NULL;
	267	}
2c888cfb RR	268	static inline int hpage_nr_pages(struct page *page)
	269	{
	270	if (unlikely(PageTransHuge(page)))
	271	return HPAGE_PMD_NR;
	272	return 1;
	273	}
d10e63f2	274
a00cc7d9	275	struct page follow_devmap_pmd(struct vm_area_struct vma, unsigned long addr,
df06b37f	276	pmd_t pmd, int flags, struct dev_pagemap *pgmap);
a00cc7d9	277	struct page follow_devmap_pud(struct vm_area_struct vma, unsigned long addr,
df06b37f	278	pud_t pud, int flags, struct dev_pagemap *pgmap);
a00cc7d9	279
2b740303	280	extern vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
d10e63f2	281
56873f43 WY	282	extern struct page *huge_zero_page;
	283
	284	static inline bool is_huge_zero_page(struct page *page)
	285	{
6aa7de05	286	return READ_ONCE(huge_zero_page) == page;
56873f43 WY	287	}
56873f43 WY	288
fc437044 MW	289	static inline bool is_huge_zero_pmd(pmd_t pmd)
	290	{
	291	return is_huge_zero_page(pmd_page(pmd));
	292	}
	293
a00cc7d9 MW	294	static inline bool is_huge_zero_pud(pud_t pud)
	295	{
	296	return false;
	297	}
	298
6fcb52a5 AL	299	struct page mm_get_huge_zero_page(struct mm_struct mm);
6fcb52a5 AL	300	void mm_put_huge_zero_page(struct mm_struct *mm);
fc437044	301
10102459 KS	302	#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
10102459 KS	303
9c670ea3 NH	304	static inline bool thp_migration_supported(void)
	305	{
	306	return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
	307	}
	308
87eaceb3 YS	309	static inline struct list_head page_deferred_list(struct page page)
	310	{
	311	/*
	312	* Global or memcg deferred list in the second tail pages is
	313	* occupied by compound_head.
	314	*/
	315	return &page[2].deferred_list;
	316	}
	317
71e3aac0	318	#else /* CONFIG_TRANSPARENT_HUGEPAGE */
d8c37c48 NH	319	#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
	320	#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
	321	#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
71e3aac0	322
a00cc7d9 MW	323	#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
	324	#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
	325	#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
	326
77d6b909 MWO	327	static inline int hpage_nr_pages(struct page *page)
	328	{
	329	VM_BUG_ON_PAGE(PageTail(page), page);
	330	return 1;
	331	}
2c888cfb	332
7635d9cb MH	333	static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
	334	{
	335	return false;
	336	}
	337
16981d76 DW	338	static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
	339	{
	340	return false;
	341	}
71e3aac0	342
43675e6f YS	343	static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
	344	unsigned long haddr)
	345	{
	346	return false;
	347	}
	348
800d8c63 KS	349	static inline void prep_transhuge_page(struct page *page) {}
800d8c63 KS	350
005ba37c SC	351	static inline bool is_transparent_hugepage(struct page *page)
	352	{
	353	return false;
	354	}
	355
71e3aac0	356	#define transparent_hugepage_flags 0UL
74d2fad1 TK	357
	358	#define thp_get_unmapped_area NULL
	359
b8f593cd HY	360	static inline bool
	361	can_split_huge_page(struct page page, int pextra_pins)
	362	{
	363	BUILD_BUG();
	364	return false;
	365	}
5bc7b8ac SL	366	static inline int
	367	split_huge_page_to_list(struct page page, struct list_head list)
	368	{
	369	return 0;
	370	}
71e3aac0 AA	371	static inline int split_huge_page(struct page *page)
	372	{
	373	return 0;
	374	}
9a982250	375	static inline void deferred_split_huge_page(struct page *page) {}
78ddc534	376	#define split_huge_pmd(__vma, __pmd, __address) \
e180377f	377	do { } while (0)
2a52bcbc	378
fd60775a DR	379	static inline void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
fd60775a DR	380	unsigned long address, bool freeze, struct page *page) {}
2a52bcbc	381	static inline void split_huge_pmd_address(struct vm_area_struct *vma,
fec89c10	382	unsigned long address, bool freeze, struct page *page) {}
2a52bcbc	383
a00cc7d9 MW	384	#define split_huge_pud(__vma, __pmd, __address) \
	385	do { } while (0)
	386
60ab3244 AA	387	static inline int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	388	unsigned long *vm_flags, int advice)
0af4e98b AA	389	{
	390	BUG();
	391	return 0;
	392	}
94fcc585 AA	393	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	394	unsigned long start,
	395	unsigned long end,
	396	long adjust_next)
	397	{
	398	}
84c3fc4e ZY	399	static inline int is_swap_pmd(pmd_t pmd)
	400	{
	401	return 0;
	402	}
b6ec57f4 KS	403	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	404	struct vm_area_struct *vma)
025c5b24	405	{
b6ec57f4	406	return NULL;
025c5b24	407	}
a00cc7d9 MW	408	static inline spinlock_t pud_trans_huge_lock(pud_t pud,
	409	struct vm_area_struct *vma)
	410	{
	411	return NULL;
	412	}
d10e63f2	413
2b740303 SJ	414	static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf,
2b740303 SJ	415	pmd_t orig_pmd)
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
a00cc7d9 MW	425	static inline bool is_huge_zero_pud(pud_t pud)
	426	{
	427	return false;
	428	}
	429
6fcb52a5	430	static inline void mm_put_huge_zero_page(struct mm_struct *mm)
aa88b68c	431	{
6fcb52a5	432	return;
aa88b68c	433	}
3565fce3 DW	434
3565fce3 DW	435	static inline struct page follow_devmap_pmd(struct vm_area_struct vma,
df06b37f	436	unsigned long addr, pmd_t pmd, int flags, struct dev_pagemap *pgmap)
3565fce3 DW	437	{
	438	return NULL;
	439	}
a00cc7d9 MW	440
a00cc7d9 MW	441	static inline struct page follow_devmap_pud(struct vm_area_struct vma,
df06b37f	442	unsigned long addr, pud_t pud, int flags, struct dev_pagemap *pgmap)
a00cc7d9 MW	443	{
	444	return NULL;
	445	}
9c670ea3 NH	446
	447	static inline bool thp_migration_supported(void)
	448	{
	449	return false;
	450	}
71e3aac0 AA	451	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	452
	453	#endif /* _LINUX_HUGE_MM_H */