[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 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 mm_struct *mm,
					  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);

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,
#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);

#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 HPAGE_SHIFT
#define HPAGE_PMD_MASK HPAGE_MASK
#define HPAGE_PMD_SIZE HPAGE_SIZE

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))
#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 copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
			  pmd_t *dst_pmd, pmd_t *src_pmd,
			  struct vm_area_struct *vma,
			  unsigned long addr, unsigned long end);
extern int handle_pte_fault(struct mm_struct *mm,
			    struct vm_area_struct *vma, unsigned long address,
			    pte_t *pte, pmd_t *pmd, unsigned int flags);
extern int split_huge_page(struct page *page);
extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
#define split_huge_page_pmd(__mm, __pmd)				\
	do {								\
		pmd_t *____pmd = (__pmd);				\
		if (unlikely(pmd_trans_huge(*____pmd)))			\
			__split_huge_page_pmd(__mm, ____pmd);		\
	}  while (0)
#define wait_split_huge_page(__anon_vma, __pmd)				\
	do {								\
		pmd_t *____pmd = (__pmd);				\
		anon_vma_lock(__anon_vma);				\
		anon_vma_unlock(__anon_vma);				\
		BUG_ON(pmd_trans_splitting(*____pmd) ||			\
		       pmd_trans_huge(*____pmd));			\
	} while (0)
#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);
/* mmap_sem must be held on entry */
static inline int pmd_trans_huge_lock(pmd_t *pmd,
				      struct vm_area_struct *vma)
{
	VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem));
	if (pmd_trans_huge(*pmd))
		return __pmd_trans_huge_lock(pmd, vma);
	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;
}
static inline struct page *compound_trans_head(struct page *page)
{
	if (PageTail(page)) {
		struct page *head;
		head = page->first_page;
		smp_rmb();
		/*
		 * head may be a dangling pointer.
		 * __split_huge_page_refcount clears PageTail before
		 * overwriting first_page, so if PageTail is still
		 * there it means the head pointer isn't dangling.
		 */
		if (PageTail(page))
			return head;
	}
	return 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(struct page *page)
{
	return 0;
}
#define split_huge_page_pmd(__mm, __pmd)	\
	do { } while (0)
#define wait_split_huge_page(__anon_vma, __pmd)	\
	do { } while (0)
#define compound_trans_head(page) compound_head(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 int pmd_trans_huge_lock(pmd_t *pmd,
				      struct vm_area_struct *vma)
{
	return 0;
}
#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);
	11	extern int do_huge_pmd_wp_page(struct mm_struct mm, struct vm_area_struct vma,
	12	unsigned long address, pmd_t *pmd,
	13	pmd_t orig_pmd);
71e3aac0 AA	14	extern struct page follow_trans_huge_pmd(struct mm_struct mm,
	15	unsigned long addr,
	16	pmd_t *pmd,
	17	unsigned int flags);
	18	extern int zap_huge_pmd(struct mmu_gather *tlb,
	19	struct vm_area_struct *vma,
f21760b1	20	pmd_t *pmd, unsigned long addr);
0ca1634d JW	21	extern int mincore_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
	22	unsigned long addr, unsigned long end,
	23	unsigned char *vec);
37a1c49a AA	24	extern int move_huge_pmd(struct vm_area_struct *vma,
	25	struct vm_area_struct *new_vma,
	26	unsigned long old_addr,
	27	unsigned long new_addr, unsigned long old_end,
	28	pmd_t old_pmd, pmd_t new_pmd);
cd7548ab JW	29	extern int change_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
cd7548ab JW	30	unsigned long addr, pgprot_t newprot);
71e3aac0 AA	31
	32	enum transparent_hugepage_flag {
	33	TRANSPARENT_HUGEPAGE_FLAG,
	34	TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
	35	TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
	36	TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
ba76149f	37	TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
71e3aac0 AA	38	#ifdef CONFIG_DEBUG_VM
	39	TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
	40	#endif
	41	};
	42
	43	enum page_check_address_pmd_flag {
	44	PAGE_CHECK_ADDRESS_PMD_FLAG,
	45	PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
	46	PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
	47	};
	48	extern pmd_t page_check_address_pmd(struct page page,
	49	struct mm_struct *mm,
	50	unsigned long address,
	51	enum page_check_address_pmd_flag flag);
	52
d8c37c48 NH	53	#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
	54	#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
	55
71e3aac0 AA	56	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	57	#define HPAGE_PMD_SHIFT HPAGE_SHIFT
	58	#define HPAGE_PMD_MASK HPAGE_MASK
	59	#define HPAGE_PMD_SIZE HPAGE_SIZE
	60
20995974 AS	61	extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
20995974 AS	62
71e3aac0	63	#define transparent_hugepage_enabled(__vma) \
a664b2d8 AA	64	((transparent_hugepage_flags & \
	65	(1<<TRANSPARENT_HUGEPAGE_FLAG) \|\| \
	66	(transparent_hugepage_flags & \
	67	(1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
	68	((__vma)->vm_flags & VM_HUGEPAGE))) && \
a7d6e4ec AA	69	!((__vma)->vm_flags & VM_NOHUGEPAGE) && \
a7d6e4ec AA	70	!is_vma_temporary_stack(__vma))
71e3aac0 AA	71	#define transparent_hugepage_defrag(__vma) \
	72	((transparent_hugepage_flags & \
	73	(1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) \|\| \
	74	(transparent_hugepage_flags & \
	75	(1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
	76	(__vma)->vm_flags & VM_HUGEPAGE))
	77	#ifdef CONFIG_DEBUG_VM
	78	#define transparent_hugepage_debug_cow() \
	79	(transparent_hugepage_flags & \
	80	(1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
	81	#else /* CONFIG_DEBUG_VM */
	82	#define transparent_hugepage_debug_cow() 0
	83	#endif /* CONFIG_DEBUG_VM */
	84
	85	extern unsigned long transparent_hugepage_flags;
	86	extern int copy_pte_range(struct mm_struct dst_mm, struct mm_struct src_mm,
	87	pmd_t dst_pmd, pmd_t src_pmd,
	88	struct vm_area_struct *vma,
	89	unsigned long addr, unsigned long end);
	90	extern int handle_pte_fault(struct mm_struct *mm,
	91	struct vm_area_struct *vma, unsigned long address,
	92	pte_t pte, pmd_t pmd, unsigned int flags);
	93	extern int split_huge_page(struct page *page);
	94	extern void __split_huge_page_pmd(struct mm_struct mm, pmd_t pmd);
	95	#define split_huge_page_pmd(__mm, __pmd) \
	96	do { \
	97	pmd_t *____pmd = (__pmd); \
	98	if (unlikely(pmd_trans_huge(*____pmd))) \
	99	__split_huge_page_pmd(__mm, ____pmd); \
	100	} while (0)
	101	#define wait_split_huge_page(__anon_vma, __pmd) \
	102	do { \
	103	pmd_t *____pmd = (__pmd); \
2b575eb6 PZ	104	anon_vma_lock(__anon_vma); \
2b575eb6 PZ	105	anon_vma_unlock(__anon_vma); \
71e3aac0 AA	106	BUG_ON(pmd_trans_splitting(*____pmd) \|\| \
	107	pmd_trans_huge(*____pmd)); \
	108	} while (0)
71e3aac0 AA	109	#if HPAGE_PMD_ORDER > MAX_ORDER
	110	#error "hugepages can't be allocated by the buddy allocator"
	111	#endif
60ab3244 AA	112	extern int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	113	unsigned long *vm_flags, int advice);
94fcc585 AA	114	extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
	115	unsigned long start,
	116	unsigned long end,
	117	long adjust_next);
025c5b24 NH	118	extern int __pmd_trans_huge_lock(pmd_t *pmd,
	119	struct vm_area_struct *vma);
	120	/* mmap_sem must be held on entry */
	121	static inline int pmd_trans_huge_lock(pmd_t *pmd,
	122	struct vm_area_struct *vma)
	123	{
	124	VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem));
	125	if (pmd_trans_huge(*pmd))
	126	return __pmd_trans_huge_lock(pmd, vma);
	127	else
	128	return 0;
	129	}
94fcc585 AA	130	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	131	unsigned long start,
	132	unsigned long end,
	133	long adjust_next)
	134	{
78f11a25	135	if (!vma->anon_vma \|\| vma->vm_ops)
94fcc585 AA	136	return;
	137	__vma_adjust_trans_huge(vma, start, end, adjust_next);
	138	}
2c888cfb RR	139	static inline int hpage_nr_pages(struct page *page)
	140	{
	141	if (unlikely(PageTransHuge(page)))
	142	return HPAGE_PMD_NR;
	143	return 1;
	144	}
22e5c47e AA	145	static inline struct page compound_trans_head(struct page page)
	146	{
	147	if (PageTail(page)) {
	148	struct page *head;
	149	head = page->first_page;
	150	smp_rmb();
	151	/*
	152	* head may be a dangling pointer.
	153	* __split_huge_page_refcount clears PageTail before
	154	* overwriting first_page, so if PageTail is still
	155	* there it means the head pointer isn't dangling.
	156	*/
	157	if (PageTail(page))
	158	return head;
	159	}
	160	return page;
	161	}
71e3aac0	162	#else /* CONFIG_TRANSPARENT_HUGEPAGE */
d8c37c48 NH	163	#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
	164	#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
	165	#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
71e3aac0	166
2c888cfb RR	167	#define hpage_nr_pages(x) 1
2c888cfb RR	168
71e3aac0 AA	169	#define transparent_hugepage_enabled(__vma) 0
	170
	171	#define transparent_hugepage_flags 0UL
	172	static inline int split_huge_page(struct page *page)
	173	{
	174	return 0;
	175	}
	176	#define split_huge_page_pmd(__mm, __pmd) \
	177	do { } while (0)
	178	#define wait_split_huge_page(__anon_vma, __pmd) \
	179	do { } while (0)
22e5c47e	180	#define compound_trans_head(page) compound_head(page)
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	}
025c5b24 NH	193	static inline int pmd_trans_huge_lock(pmd_t *pmd,
	194	struct vm_area_struct *vma)
	195	{
	196	return 0;
	197	}
71e3aac0 AA	198	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	199
	200	#endif /* _LINUX_HUGE_MM_H */