[mirror_ubuntu-artful-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 mm_struct *mm,
				      struct vm_area_struct *vma,
				      unsigned long address, pmd_t *pmd,
				      unsigned int flags);
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 mm_struct *mm,
				  struct vm_area_struct *vma,
				  unsigned long address, pmd_t *pmd,
				  pmd_t orig_pmd, int dirty);
extern int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
			       unsigned long address, pmd_t *pmd,
			       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 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 int move_huge_pmd(struct vm_area_struct *vma,
			 struct vm_area_struct *new_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);

enum transparent_hugepage_flag {
	TRANSPARENT_HUGEPAGE_FLAG,
	TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
	TRANSPARENT_HUGEPAGE_DEFRAG_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
};

enum page_check_address_pmd_flag {
	PAGE_CHECK_ADDRESS_PMD_FLAG,
	PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
	PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
};
extern pmd_t *page_check_address_pmd(struct page *page,
				     struct mm_struct *mm,
				     unsigned long address,
				     enum page_check_address_pmd_flag flag,
				     spinlock_t **ptl);

#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))

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_defrag(__vma)				\
	((transparent_hugepage_flags &					\
	  (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) ||			\
	 (transparent_hugepage_flags &					\
	  (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) &&		\
	  (__vma)->vm_flags & VM_HUGEPAGE))
#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 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);
}
extern void __split_huge_page_pmd(struct vm_area_struct *vma,
		unsigned long address, pmd_t *pmd);
#define split_huge_page_pmd(__vma, __address, __pmd)			\
	do {								\
		pmd_t *____pmd = (__pmd);				\
		if (unlikely(pmd_trans_huge(*____pmd)))			\
			__split_huge_page_pmd(__vma, __address,		\
					____pmd);			\
	}  while (0)
#define wait_split_huge_page(__anon_vma, __pmd)				\
	do {								\
		pmd_t *____pmd = (__pmd);				\
		anon_vma_lock_write(__anon_vma);			\
		anon_vma_unlock_write(__anon_vma);			\
		BUG_ON(pmd_trans_splitting(*____pmd) ||			\
		       pmd_trans_huge(*____pmd));			\
	} while (0)
extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address,
		pmd_t *pmd);
#if HPAGE_PMD_ORDER >= MAX_ORDER
#error "hugepages can't be allocated by the buddy allocator"
#endif
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 int __pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
		spinlock_t **ptl);
/* mmap_sem must be held on entry */
static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
		spinlock_t **ptl)
{
	VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
	if (pmd_trans_huge(*pmd))
		return __pmd_trans_huge_lock(pmd, vma, ptl);
	else
		return 0;
}
static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
					 unsigned long start,
					 unsigned long end,
					 long adjust_next)
{
	if (!vma->anon_vma || vma->vm_ops)
		return;
	__vma_adjust_trans_huge(vma, start, end, adjust_next);
}
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 mm_struct *mm, struct vm_area_struct *vma,
				unsigned long addr, pmd_t pmd, pmd_t *pmdp);

extern struct page *huge_zero_page;

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

#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

#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;
}
#define split_huge_page_pmd(__vma, __address, __pmd)	\
	do { } while (0)
#define wait_split_huge_page(__anon_vma, __pmd)	\
	do { } while (0)
#define split_huge_page_pmd_mm(__mm, __address, __pmd)	\
	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 pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
		spinlock_t **ptl)
{
	return 0;
}

static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
					unsigned long addr, pmd_t pmd, pmd_t *pmdp)
{
	return 0;
}

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

#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
	4	extern int do_huge_pmd_anonymous_page(struct mm_struct *mm,
	5	struct vm_area_struct *vma,
	6	unsigned long address, pmd_t *pmd,
	7	unsigned int flags);
	8	extern int copy_huge_pmd(struct mm_struct dst_mm, struct mm_struct src_mm,
	9	pmd_t dst_pmd, pmd_t src_pmd, unsigned long addr,
	10	struct vm_area_struct *vma);
a1dd450b WD	11	extern void huge_pmd_set_accessed(struct mm_struct *mm,
	12	struct vm_area_struct *vma,
	13	unsigned long address, pmd_t *pmd,
	14	pmd_t orig_pmd, int dirty);
71e3aac0 AA	15	extern int do_huge_pmd_wp_page(struct mm_struct mm, struct vm_area_struct vma,
	16	unsigned long address, pmd_t *pmd,
	17	pmd_t orig_pmd);
b676b293	18	extern struct page follow_trans_huge_pmd(struct vm_area_struct vma,
71e3aac0 AA	19	unsigned long addr,
	20	pmd_t *pmd,
	21	unsigned int flags);
	22	extern int zap_huge_pmd(struct mmu_gather *tlb,
	23	struct vm_area_struct *vma,
f21760b1	24	pmd_t *pmd, unsigned long addr);
0ca1634d JW	25	extern int mincore_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
	26	unsigned long addr, unsigned long end,
	27	unsigned char *vec);
37a1c49a AA	28	extern int move_huge_pmd(struct vm_area_struct *vma,
	29	struct vm_area_struct *new_vma,
	30	unsigned long old_addr,
	31	unsigned long new_addr, unsigned long old_end,
	32	pmd_t old_pmd, pmd_t new_pmd);
cd7548ab	33	extern int change_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
4b10e7d5 MG	34	unsigned long addr, pgprot_t newprot,
4b10e7d5 MG	35	int prot_numa);
71e3aac0 AA	36
	37	enum transparent_hugepage_flag {
	38	TRANSPARENT_HUGEPAGE_FLAG,
	39	TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
	40	TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
	41	TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
ba76149f	42	TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
79da5407	43	TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
71e3aac0 AA	44	#ifdef CONFIG_DEBUG_VM
	45	TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
	46	#endif
	47	};
	48
	49	enum page_check_address_pmd_flag {
	50	PAGE_CHECK_ADDRESS_PMD_FLAG,
	51	PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
	52	PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
	53	};
	54	extern pmd_t page_check_address_pmd(struct page page,
	55	struct mm_struct *mm,
	56	unsigned long address,
117b0791 KS	57	enum page_check_address_pmd_flag flag,
117b0791 KS	58	spinlock_t **ptl);
71e3aac0	59
d8c37c48 NH	60	#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
	61	#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
	62
71e3aac0	63	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
fde52796 AK	64	#define HPAGE_PMD_SHIFT PMD_SHIFT
	65	#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
	66	#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
71e3aac0	67
20995974 AS	68	extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
20995974 AS	69
71e3aac0	70	#define transparent_hugepage_enabled(__vma) \
a664b2d8 AA	71	((transparent_hugepage_flags & \
	72	(1<<TRANSPARENT_HUGEPAGE_FLAG) \|\| \
	73	(transparent_hugepage_flags & \
	74	(1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
	75	((__vma)->vm_flags & VM_HUGEPAGE))) && \
a7d6e4ec AA	76	!((__vma)->vm_flags & VM_NOHUGEPAGE) && \
a7d6e4ec AA	77	!is_vma_temporary_stack(__vma))
71e3aac0 AA	78	#define transparent_hugepage_defrag(__vma) \
	79	((transparent_hugepage_flags & \
	80	(1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) \|\| \
	81	(transparent_hugepage_flags & \
	82	(1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
	83	(__vma)->vm_flags & VM_HUGEPAGE))
79da5407 KS	84	#define transparent_hugepage_use_zero_page() \
	85	(transparent_hugepage_flags & \
	86	(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
71e3aac0 AA	87	#ifdef CONFIG_DEBUG_VM
	88	#define transparent_hugepage_debug_cow() \
	89	(transparent_hugepage_flags & \
	90	(1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
	91	#else /* CONFIG_DEBUG_VM */
	92	#define transparent_hugepage_debug_cow() 0
	93	#endif /* CONFIG_DEBUG_VM */
	94
	95	extern unsigned long transparent_hugepage_flags;
5bc7b8ac SL	96	extern int split_huge_page_to_list(struct page page, struct list_head list);
	97	static inline int split_huge_page(struct page *page)
	98	{
	99	return split_huge_page_to_list(page, NULL);
	100	}
e180377f KS	101	extern void __split_huge_page_pmd(struct vm_area_struct *vma,
	102	unsigned long address, pmd_t *pmd);
	103	#define split_huge_page_pmd(__vma, __address, __pmd) \
71e3aac0 AA	104	do { \
	105	pmd_t *____pmd = (__pmd); \
	106	if (unlikely(pmd_trans_huge(*____pmd))) \
e180377f KS	107	__split_huge_page_pmd(__vma, __address, \
e180377f KS	108	____pmd); \
71e3aac0 AA	109	} while (0)
	110	#define wait_split_huge_page(__anon_vma, __pmd) \
	111	do { \
	112	pmd_t *____pmd = (__pmd); \
4fc3f1d6	113	anon_vma_lock_write(__anon_vma); \
08b52706	114	anon_vma_unlock_write(__anon_vma); \
71e3aac0 AA	115	BUG_ON(pmd_trans_splitting(*____pmd) \|\| \
	116	pmd_trans_huge(*____pmd)); \
	117	} while (0)
e180377f KS	118	extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address,
e180377f KS	119	pmd_t *pmd);
dfa5e237	120	#if HPAGE_PMD_ORDER >= MAX_ORDER
71e3aac0 AA	121	#error "hugepages can't be allocated by the buddy allocator"
71e3aac0 AA	122	#endif
60ab3244 AA	123	extern int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	124	unsigned long *vm_flags, int advice);
94fcc585 AA	125	extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
	126	unsigned long start,
	127	unsigned long end,
	128	long adjust_next);
bf929152 KS	129	extern int __pmd_trans_huge_lock(pmd_t pmd, struct vm_area_struct vma,
bf929152 KS	130	spinlock_t **ptl);
025c5b24	131	/* mmap_sem must be held on entry */
bf929152 KS	132	static inline int pmd_trans_huge_lock(pmd_t pmd, struct vm_area_struct vma,
bf929152 KS	133	spinlock_t **ptl)
025c5b24	134	{
81d1b09c	135	VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
025c5b24	136	if (pmd_trans_huge(*pmd))
bf929152	137	return __pmd_trans_huge_lock(pmd, vma, ptl);
025c5b24 NH	138	else
	139	return 0;
	140	}
94fcc585 AA	141	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	142	unsigned long start,
	143	unsigned long end,
	144	long adjust_next)
	145	{
78f11a25	146	if (!vma->anon_vma \|\| vma->vm_ops)
94fcc585 AA	147	return;
	148	__vma_adjust_trans_huge(vma, start, end, adjust_next);
	149	}
2c888cfb RR	150	static inline int hpage_nr_pages(struct page *page)
	151	{
	152	if (unlikely(PageTransHuge(page)))
	153	return HPAGE_PMD_NR;
	154	return 1;
	155	}
d10e63f2	156
4daae3b4 MG	157	extern int do_huge_pmd_numa_page(struct mm_struct mm, struct vm_area_struct vma,
4daae3b4 MG	158	unsigned long addr, pmd_t pmd, pmd_t *pmdp);
d10e63f2	159
56873f43 WY	160	extern struct page *huge_zero_page;
	161
	162	static inline bool is_huge_zero_page(struct page *page)
	163	{
	164	return ACCESS_ONCE(huge_zero_page) == page;
	165	}
	166
71e3aac0	167	#else /* CONFIG_TRANSPARENT_HUGEPAGE */
d8c37c48 NH	168	#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
	169	#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
	170	#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
71e3aac0	171
2c888cfb RR	172	#define hpage_nr_pages(x) 1
2c888cfb RR	173
71e3aac0 AA	174	#define transparent_hugepage_enabled(__vma) 0
	175
	176	#define transparent_hugepage_flags 0UL
5bc7b8ac SL	177	static inline int
	178	split_huge_page_to_list(struct page page, struct list_head list)
	179	{
	180	return 0;
	181	}
71e3aac0 AA	182	static inline int split_huge_page(struct page *page)
	183	{
	184	return 0;
	185	}
e180377f	186	#define split_huge_page_pmd(__vma, __address, __pmd) \
71e3aac0 AA	187	do { } while (0)
	188	#define wait_split_huge_page(__anon_vma, __pmd) \
	189	do { } while (0)
e180377f KS	190	#define split_huge_page_pmd_mm(__mm, __address, __pmd) \
e180377f KS	191	do { } while (0)
60ab3244 AA	192	static inline int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	193	unsigned long *vm_flags, int advice)
0af4e98b AA	194	{
	195	BUG();
	196	return 0;
	197	}
94fcc585 AA	198	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	199	unsigned long start,
	200	unsigned long end,
	201	long adjust_next)
	202	{
	203	}
bf929152 KS	204	static inline int pmd_trans_huge_lock(pmd_t pmd, struct vm_area_struct vma,
bf929152 KS	205	spinlock_t **ptl)
025c5b24 NH	206	{
	207	return 0;
	208	}
d10e63f2	209
4daae3b4 MG	210	static inline int do_huge_pmd_numa_page(struct mm_struct mm, struct vm_area_struct vma,
4daae3b4 MG	211	unsigned long addr, pmd_t pmd, pmd_t *pmdp)
d10e63f2	212	{
4daae3b4	213	return 0;
d10e63f2 MG	214	}
d10e63f2 MG	215
56873f43 WY	216	static inline bool is_huge_zero_page(struct page *page)
	217	{
	218	return false;
	219	}
	220
71e3aac0 AA	221	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	222
	223	#endif /* _LINUX_HUGE_MM_H */