[mirror_ubuntu-zesty-kernel.git] / include / linux / huge_mm.h

#ifndef _LINUX_HUGE_MM_H
#define _LINUX_HUGE_MM_H

extern int do_huge_pmd_anonymous_page(struct fault_env *fe);
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 fault_env *fe, pmd_t orig_pmd);
extern int do_huge_pmd_wp_page(struct fault_env *fe, 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 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,
			int prot_numa);
int vmf_insert_pfn_pmd(struct vm_area_struct *, unsigned long addr, pmd_t *,
			pfn_t pfn, bool 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_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
struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
		pmd_t *pmd, int flags);

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

extern bool is_vma_temporary_stack(struct vm_area_struct *vma);

#define transparent_hugepage_enabled(__vma)				\
	((transparent_hugepage_flags &					\
	  (1<<TRANSPARENT_HUGEPAGE_FLAG) ||				\
	  (transparent_hugepage_flags &					\
	   (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) &&			\
	   ((__vma)->vm_flags & VM_HUGEPAGE))) &&			\
	 !((__vma)->vm_flags & VM_NOHUGEPAGE) &&			\
	 !is_vma_temporary_stack(__vma))
#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 transparent_hugepage_flags;

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

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 (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);

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);
/* mmap_sem must be held on entry */
static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
		struct vm_area_struct *vma)
{
	VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
	if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
		return __pmd_trans_huge_lock(pmd, vma);
	else
		return NULL;
}
static inline int hpage_nr_pages(struct page *page)
{
	if (unlikely(PageTransHuge(page)))
		return HPAGE_PMD_NR;
	return 1;
}

extern int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t orig_pmd);

extern struct page *huge_zero_page;

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

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

struct page *get_huge_zero_page(void);
void put_huge_zero_page(void);

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

#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_nr_pages(x) 1

#define transparent_hugepage_enabled(__vma) 0

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

#define transparent_hugepage_flags 0UL
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_address(struct vm_area_struct *vma,
		unsigned long address, bool freeze, struct page *page) {}

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 spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
		struct vm_area_struct *vma)
{
	return NULL;
}

static inline int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t orig_pmd)
{
	return 0;
}

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

static inline void put_huge_zero_page(void)
{
	BUILD_BUG();
}

static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
		unsigned long addr, pmd_t *pmd, int flags)
{
	return NULL;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */

#endif /* _LINUX_HUGE_MM_H */
Commit	Line	Data
71e3aac0 AA	1	#ifndef _LINUX_HUGE_MM_H
	2	#define _LINUX_HUGE_MM_H
	3
bae473a4	4	extern int do_huge_pmd_anonymous_page(struct fault_env *fe);
71e3aac0 AA	5	extern int copy_huge_pmd(struct mm_struct dst_mm, struct mm_struct src_mm,
	6	pmd_t dst_pmd, pmd_t src_pmd, unsigned long addr,
	7	struct vm_area_struct *vma);
bae473a4 KS	8	extern void huge_pmd_set_accessed(struct fault_env *fe, pmd_t orig_pmd);
bae473a4 KS	9	extern int do_huge_pmd_wp_page(struct fault_env *fe, pmd_t orig_pmd);
b676b293	10	extern struct page follow_trans_huge_pmd(struct vm_area_struct vma,
71e3aac0 AA	11	unsigned long addr,
	12	pmd_t *pmd,
	13	unsigned int flags);
319904ad	14	extern bool madvise_free_huge_pmd(struct mmu_gather *tlb,
b8d3c4c3 MK	15	struct vm_area_struct *vma,
b8d3c4c3 MK	16	pmd_t *pmd, unsigned long addr, unsigned long next);
71e3aac0 AA	17	extern int zap_huge_pmd(struct mmu_gather *tlb,
71e3aac0 AA	18	struct vm_area_struct *vma,
f21760b1	19	pmd_t *pmd, unsigned long addr);
0ca1634d JW	20	extern int mincore_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
	21	unsigned long addr, unsigned long end,
	22	unsigned char *vec);
bf8616d5	23	extern bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
37a1c49a AA	24	unsigned long new_addr, unsigned long old_end,
37a1c49a AA	25	pmd_t old_pmd, pmd_t new_pmd);
cd7548ab	26	extern int change_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
4b10e7d5 MG	27	unsigned long addr, pgprot_t newprot,
4b10e7d5 MG	28	int prot_numa);
5cad465d	29	int vmf_insert_pfn_pmd(struct vm_area_struct , unsigned long addr, pmd_t ,
f25748e3	30	pfn_t pfn, bool write);
71e3aac0 AA	31	enum transparent_hugepage_flag {
	32	TRANSPARENT_HUGEPAGE_FLAG,
	33	TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
444eb2a4 MG	34	TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
444eb2a4 MG	35	TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
71e3aac0	36	TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
ba76149f	37	TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
79da5407	38	TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
71e3aac0 AA	39	#ifdef CONFIG_DEBUG_VM
	40	TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
	41	#endif
	42	};
	43
b46e756f KS	44	struct kobject;
	45	struct kobj_attribute;
	46
	47	extern ssize_t single_hugepage_flag_store(struct kobject *kobj,
	48	struct kobj_attribute *attr,
	49	const char *buf, size_t count,
	50	enum transparent_hugepage_flag flag);
	51	extern ssize_t single_hugepage_flag_show(struct kobject *kobj,
	52	struct kobj_attribute attr, char buf,
	53	enum transparent_hugepage_flag flag);
5a6e75f8 KS	54	extern struct kobj_attribute shmem_enabled_attr;
5a6e75f8 KS	55
d8c37c48 NH	56	#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
	57	#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
	58
71e3aac0	59	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
3565fce3 DW	60	struct page follow_devmap_pmd(struct vm_area_struct vma, unsigned long addr,
	61	pmd_t *pmd, int flags);
	62
fde52796 AK	63	#define HPAGE_PMD_SHIFT PMD_SHIFT
	64	#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
	65	#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
71e3aac0	66
20995974 AS	67	extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
20995974 AS	68
71e3aac0	69	#define transparent_hugepage_enabled(__vma) \
a664b2d8 AA	70	((transparent_hugepage_flags & \
	71	(1<<TRANSPARENT_HUGEPAGE_FLAG) \|\| \
	72	(transparent_hugepage_flags & \
	73	(1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
	74	((__vma)->vm_flags & VM_HUGEPAGE))) && \
a7d6e4ec AA	75	!((__vma)->vm_flags & VM_NOHUGEPAGE) && \
a7d6e4ec AA	76	!is_vma_temporary_stack(__vma))
79da5407 KS	77	#define transparent_hugepage_use_zero_page() \
	78	(transparent_hugepage_flags & \
	79	(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
71e3aac0 AA	80	#ifdef CONFIG_DEBUG_VM
	81	#define transparent_hugepage_debug_cow() \
	82	(transparent_hugepage_flags & \
	83	(1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
	84	#else /* CONFIG_DEBUG_VM */
	85	#define transparent_hugepage_debug_cow() 0
	86	#endif /* CONFIG_DEBUG_VM */
	87
	88	extern unsigned long transparent_hugepage_flags;
ad0bed24	89
9a982250 KS	90	extern void prep_transhuge_page(struct page *page);
	91	extern void free_transhuge_page(struct page *page);
	92
e9b61f19 KS	93	int split_huge_page_to_list(struct page page, struct list_head list);
	94	static inline int split_huge_page(struct page *page)
	95	{
	96	return split_huge_page_to_list(page, NULL);
	97	}
9a982250	98	void deferred_split_huge_page(struct page *page);
eef1b3ba KS	99
eef1b3ba KS	100	void __split_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
33f4751e	101	unsigned long address, bool freeze, struct page *page);
eef1b3ba KS	102
	103	#define split_huge_pmd(__vma, __pmd, __address) \
	104	do { \
	105	pmd_t *____pmd = (__pmd); \
5c7fb56e DW	106	if (pmd_trans_huge(*____pmd) \
5c7fb56e DW	107	\|\| pmd_devmap(*____pmd)) \
fec89c10	108	__split_huge_pmd(__vma, __pmd, __address, \
33f4751e	109	false, NULL); \
eef1b3ba	110	} while (0)
ad0bed24	111
2a52bcbc	112
fec89c10 KS	113	void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
fec89c10 KS	114	bool freeze, struct page *page);
2a52bcbc	115
60ab3244 AA	116	extern int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	117	unsigned long *vm_flags, int advice);
e1b9996b	118	extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
94fcc585 AA	119	unsigned long start,
	120	unsigned long end,
	121	long adjust_next);
b6ec57f4 KS	122	extern spinlock_t __pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	123	struct vm_area_struct *vma);
025c5b24	124	/* mmap_sem must be held on entry */
b6ec57f4 KS	125	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	126	struct vm_area_struct *vma)
025c5b24	127	{
81d1b09c	128	VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
5c7fb56e	129	if (pmd_trans_huge(pmd) \|\| pmd_devmap(pmd))
b6ec57f4	130	return __pmd_trans_huge_lock(pmd, vma);
025c5b24	131	else
969e8d7e	132	return NULL;
025c5b24	133	}
2c888cfb RR	134	static inline int hpage_nr_pages(struct page *page)
	135	{
	136	if (unlikely(PageTransHuge(page)))
	137	return HPAGE_PMD_NR;
	138	return 1;
	139	}
d10e63f2	140
bae473a4	141	extern int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t orig_pmd);
d10e63f2	142
56873f43 WY	143	extern struct page *huge_zero_page;
	144
	145	static inline bool is_huge_zero_page(struct page *page)
	146	{
	147	return ACCESS_ONCE(huge_zero_page) == page;
	148	}
	149
fc437044 MW	150	static inline bool is_huge_zero_pmd(pmd_t pmd)
	151	{
	152	return is_huge_zero_page(pmd_page(pmd));
	153	}
	154
	155	struct page *get_huge_zero_page(void);
aa88b68c	156	void put_huge_zero_page(void);
fc437044	157
10102459 KS	158	#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
10102459 KS	159
71e3aac0	160	#else /* CONFIG_TRANSPARENT_HUGEPAGE */
d8c37c48 NH	161	#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
	162	#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
	163	#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
71e3aac0	164
2c888cfb RR	165	#define hpage_nr_pages(x) 1
2c888cfb RR	166
71e3aac0 AA	167	#define transparent_hugepage_enabled(__vma) 0
71e3aac0 AA	168
800d8c63 KS	169	static inline void prep_transhuge_page(struct page *page) {}
800d8c63 KS	170
71e3aac0	171	#define transparent_hugepage_flags 0UL
5bc7b8ac SL	172	static inline int
	173	split_huge_page_to_list(struct page page, struct list_head list)
	174	{
	175	return 0;
	176	}
71e3aac0 AA	177	static inline int split_huge_page(struct page *page)
	178	{
	179	return 0;
	180	}
9a982250	181	static inline void deferred_split_huge_page(struct page *page) {}
78ddc534	182	#define split_huge_pmd(__vma, __pmd, __address) \
e180377f	183	do { } while (0)
2a52bcbc KS	184
2a52bcbc KS	185	static inline void split_huge_pmd_address(struct vm_area_struct *vma,
fec89c10	186	unsigned long address, bool freeze, struct page *page) {}
2a52bcbc	187
60ab3244 AA	188	static inline int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	189	unsigned long *vm_flags, int advice)
0af4e98b AA	190	{
	191	BUG();
	192	return 0;
	193	}
94fcc585 AA	194	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	195	unsigned long start,
	196	unsigned long end,
	197	long adjust_next)
	198	{
	199	}
b6ec57f4 KS	200	static inline spinlock_t pmd_trans_huge_lock(pmd_t pmd,
b6ec57f4 KS	201	struct vm_area_struct *vma)
025c5b24	202	{
b6ec57f4	203	return NULL;
025c5b24	204	}
d10e63f2	205
bae473a4	206	static inline int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t orig_pmd)
d10e63f2	207	{
4daae3b4	208	return 0;
d10e63f2 MG	209	}
d10e63f2 MG	210
56873f43 WY	211	static inline bool is_huge_zero_page(struct page *page)
	212	{
	213	return false;
	214	}
	215
aa88b68c KS	216	static inline void put_huge_zero_page(void)
	217	{
	218	BUILD_BUG();
	219	}
3565fce3 DW	220
	221	static inline struct page follow_devmap_pmd(struct vm_area_struct vma,
	222	unsigned long addr, pmd_t *pmd, int flags)
	223	{
	224	return NULL;
	225	}
71e3aac0 AA	226	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	227
	228	#endif /* _LINUX_HUGE_MM_H */