[linux-2.6-block.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 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
};

#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 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;
}

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);

#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;
}
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 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;
}

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