[deliverable/linux.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 pgtable_t get_pmd_huge_pte(struct mm_struct *mm);
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);

#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define HPAGE_PMD_SHIFT HPAGE_SHIFT
#define HPAGE_PMD_MASK HPAGE_MASK
#define HPAGE_PMD_SIZE HPAGE_SIZE

#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)
#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
#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 ({ BUG(); 0; })
#define HPAGE_PMD_MASK ({ BUG(); 0; })
#define HPAGE_PMD_SIZE ({ 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);
	14	extern pgtable_t get_pmd_huge_pte(struct mm_struct *mm);
	15	extern struct page follow_trans_huge_pmd(struct mm_struct mm,
	16	unsigned long addr,
	17	pmd_t *pmd,
	18	unsigned int flags);
	19	extern int zap_huge_pmd(struct mmu_gather *tlb,
	20	struct vm_area_struct *vma,
f21760b1	21	pmd_t *pmd, unsigned long addr);
0ca1634d JW	22	extern int mincore_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
	23	unsigned long addr, unsigned long end,
	24	unsigned char *vec);
37a1c49a AA	25	extern int move_huge_pmd(struct vm_area_struct *vma,
	26	struct vm_area_struct *new_vma,
	27	unsigned long old_addr,
	28	unsigned long new_addr, unsigned long old_end,
	29	pmd_t old_pmd, pmd_t new_pmd);
cd7548ab JW	30	extern int change_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
cd7548ab JW	31	unsigned long addr, pgprot_t newprot);
71e3aac0 AA	32
	33	enum transparent_hugepage_flag {
	34	TRANSPARENT_HUGEPAGE_FLAG,
	35	TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
	36	TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
	37	TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
ba76149f	38	TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
71e3aac0 AA	39	#ifdef CONFIG_DEBUG_VM
	40	TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
	41	#endif
	42	};
	43
	44	enum page_check_address_pmd_flag {
	45	PAGE_CHECK_ADDRESS_PMD_FLAG,
	46	PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
	47	PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
	48	};
	49	extern pmd_t page_check_address_pmd(struct page page,
	50	struct mm_struct *mm,
	51	unsigned long address,
	52	enum page_check_address_pmd_flag flag);
	53
	54	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	55	#define HPAGE_PMD_SHIFT HPAGE_SHIFT
	56	#define HPAGE_PMD_MASK HPAGE_MASK
	57	#define HPAGE_PMD_SIZE HPAGE_SIZE
	58
	59	#define transparent_hugepage_enabled(__vma) \
a664b2d8 AA	60	((transparent_hugepage_flags & \
	61	(1<<TRANSPARENT_HUGEPAGE_FLAG) \|\| \
	62	(transparent_hugepage_flags & \
	63	(1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
	64	((__vma)->vm_flags & VM_HUGEPAGE))) && \
a7d6e4ec AA	65	!((__vma)->vm_flags & VM_NOHUGEPAGE) && \
a7d6e4ec AA	66	!is_vma_temporary_stack(__vma))
71e3aac0 AA	67	#define transparent_hugepage_defrag(__vma) \
	68	((transparent_hugepage_flags & \
	69	(1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) \|\| \
	70	(transparent_hugepage_flags & \
	71	(1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
	72	(__vma)->vm_flags & VM_HUGEPAGE))
	73	#ifdef CONFIG_DEBUG_VM
	74	#define transparent_hugepage_debug_cow() \
	75	(transparent_hugepage_flags & \
	76	(1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
	77	#else /* CONFIG_DEBUG_VM */
	78	#define transparent_hugepage_debug_cow() 0
	79	#endif /* CONFIG_DEBUG_VM */
	80
	81	extern unsigned long transparent_hugepage_flags;
	82	extern int copy_pte_range(struct mm_struct dst_mm, struct mm_struct src_mm,
	83	pmd_t dst_pmd, pmd_t src_pmd,
	84	struct vm_area_struct *vma,
	85	unsigned long addr, unsigned long end);
	86	extern int handle_pte_fault(struct mm_struct *mm,
	87	struct vm_area_struct *vma, unsigned long address,
	88	pte_t pte, pmd_t pmd, unsigned int flags);
	89	extern int split_huge_page(struct page *page);
	90	extern void __split_huge_page_pmd(struct mm_struct mm, pmd_t pmd);
	91	#define split_huge_page_pmd(__mm, __pmd) \
	92	do { \
	93	pmd_t *____pmd = (__pmd); \
	94	if (unlikely(pmd_trans_huge(*____pmd))) \
	95	__split_huge_page_pmd(__mm, ____pmd); \
	96	} while (0)
	97	#define wait_split_huge_page(__anon_vma, __pmd) \
	98	do { \
	99	pmd_t *____pmd = (__pmd); \
2b575eb6 PZ	100	anon_vma_lock(__anon_vma); \
2b575eb6 PZ	101	anon_vma_unlock(__anon_vma); \
71e3aac0 AA	102	BUG_ON(pmd_trans_splitting(*____pmd) \|\| \
	103	pmd_trans_huge(*____pmd)); \
	104	} while (0)
	105	#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
	106	#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
	107	#if HPAGE_PMD_ORDER > MAX_ORDER
	108	#error "hugepages can't be allocated by the buddy allocator"
	109	#endif
60ab3244 AA	110	extern int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	111	unsigned long *vm_flags, int advice);
94fcc585 AA	112	extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
	113	unsigned long start,
	114	unsigned long end,
	115	long adjust_next);
025c5b24 NH	116	extern int __pmd_trans_huge_lock(pmd_t *pmd,
	117	struct vm_area_struct *vma);
	118	/* mmap_sem must be held on entry */
	119	static inline int pmd_trans_huge_lock(pmd_t *pmd,
	120	struct vm_area_struct *vma)
	121	{
	122	VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem));
	123	if (pmd_trans_huge(*pmd))
	124	return __pmd_trans_huge_lock(pmd, vma);
	125	else
	126	return 0;
	127	}
94fcc585 AA	128	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	129	unsigned long start,
	130	unsigned long end,
	131	long adjust_next)
	132	{
78f11a25	133	if (!vma->anon_vma \|\| vma->vm_ops)
94fcc585 AA	134	return;
	135	__vma_adjust_trans_huge(vma, start, end, adjust_next);
	136	}
2c888cfb RR	137	static inline int hpage_nr_pages(struct page *page)
	138	{
	139	if (unlikely(PageTransHuge(page)))
	140	return HPAGE_PMD_NR;
	141	return 1;
	142	}
22e5c47e AA	143	static inline struct page compound_trans_head(struct page page)
	144	{
	145	if (PageTail(page)) {
	146	struct page *head;
	147	head = page->first_page;
	148	smp_rmb();
	149	/*
	150	* head may be a dangling pointer.
	151	* __split_huge_page_refcount clears PageTail before
	152	* overwriting first_page, so if PageTail is still
	153	* there it means the head pointer isn't dangling.
	154	*/
	155	if (PageTail(page))
	156	return head;
	157	}
	158	return page;
	159	}
71e3aac0 AA	160	#else /* CONFIG_TRANSPARENT_HUGEPAGE */
	161	#define HPAGE_PMD_SHIFT ({ BUG(); 0; })
	162	#define HPAGE_PMD_MASK ({ BUG(); 0; })
	163	#define HPAGE_PMD_SIZE ({ BUG(); 0; })
	164
2c888cfb RR	165	#define hpage_nr_pages(x) 1
2c888cfb RR	166
71e3aac0 AA	167	#define transparent_hugepage_enabled(__vma) 0
	168
	169	#define transparent_hugepage_flags 0UL
	170	static inline int split_huge_page(struct page *page)
	171	{
	172	return 0;
	173	}
	174	#define split_huge_page_pmd(__mm, __pmd) \
	175	do { } while (0)
	176	#define wait_split_huge_page(__anon_vma, __pmd) \
	177	do { } while (0)
22e5c47e	178	#define compound_trans_head(page) compound_head(page)
60ab3244 AA	179	static inline int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	180	unsigned long *vm_flags, int advice)
0af4e98b AA	181	{
	182	BUG();
	183	return 0;
	184	}
94fcc585 AA	185	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	186	unsigned long start,
	187	unsigned long end,
	188	long adjust_next)
	189	{
	190	}
025c5b24 NH	191	static inline int pmd_trans_huge_lock(pmd_t *pmd,
	192	struct vm_area_struct *vma)
	193	{
	194	return 0;
	195	}
71e3aac0 AA	196	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	197
	198	#endif /* _LINUX_HUGE_MM_H */