[GitHub/mt8127/android_kernel_alcatel_ttab.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 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,
#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;
}

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);

#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;
}

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;
}

#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);
b676b293	14	extern struct page follow_trans_huge_pmd(struct vm_area_struct vma,
71e3aac0 AA	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	29	extern int change_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
4b10e7d5 MG	30	unsigned long addr, pgprot_t newprot,
4b10e7d5 MG	31	int prot_numa);
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
d8c37c48 NH	54	#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
	55	#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
	56
71e3aac0 AA	57	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	58	#define HPAGE_PMD_SHIFT HPAGE_SHIFT
	59	#define HPAGE_PMD_MASK HPAGE_MASK
	60	#define HPAGE_PMD_SIZE HPAGE_SIZE
	61
20995974 AS	62	extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
20995974 AS	63
71e3aac0	64	#define transparent_hugepage_enabled(__vma) \
a664b2d8 AA	65	((transparent_hugepage_flags & \
	66	(1<<TRANSPARENT_HUGEPAGE_FLAG) \|\| \
	67	(transparent_hugepage_flags & \
	68	(1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
	69	((__vma)->vm_flags & VM_HUGEPAGE))) && \
a7d6e4ec AA	70	!((__vma)->vm_flags & VM_NOHUGEPAGE) && \
a7d6e4ec AA	71	!is_vma_temporary_stack(__vma))
71e3aac0 AA	72	#define transparent_hugepage_defrag(__vma) \
	73	((transparent_hugepage_flags & \
	74	(1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) \|\| \
	75	(transparent_hugepage_flags & \
	76	(1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
	77	(__vma)->vm_flags & VM_HUGEPAGE))
	78	#ifdef CONFIG_DEBUG_VM
	79	#define transparent_hugepage_debug_cow() \
	80	(transparent_hugepage_flags & \
	81	(1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
	82	#else /* CONFIG_DEBUG_VM */
	83	#define transparent_hugepage_debug_cow() 0
	84	#endif /* CONFIG_DEBUG_VM */
	85
	86	extern unsigned long transparent_hugepage_flags;
	87	extern int copy_pte_range(struct mm_struct dst_mm, struct mm_struct src_mm,
	88	pmd_t dst_pmd, pmd_t src_pmd,
	89	struct vm_area_struct *vma,
	90	unsigned long addr, unsigned long end);
	91	extern int handle_pte_fault(struct mm_struct *mm,
	92	struct vm_area_struct *vma, unsigned long address,
	93	pte_t pte, pmd_t pmd, unsigned int flags);
	94	extern int split_huge_page(struct page *page);
	95	extern void __split_huge_page_pmd(struct mm_struct mm, pmd_t pmd);
	96	#define split_huge_page_pmd(__mm, __pmd) \
	97	do { \
	98	pmd_t *____pmd = (__pmd); \
	99	if (unlikely(pmd_trans_huge(*____pmd))) \
	100	__split_huge_page_pmd(__mm, ____pmd); \
	101	} while (0)
	102	#define wait_split_huge_page(__anon_vma, __pmd) \
	103	do { \
	104	pmd_t *____pmd = (__pmd); \
2b575eb6 PZ	105	anon_vma_lock(__anon_vma); \
2b575eb6 PZ	106	anon_vma_unlock(__anon_vma); \
71e3aac0 AA	107	BUG_ON(pmd_trans_splitting(*____pmd) \|\| \
	108	pmd_trans_huge(*____pmd)); \
	109	} while (0)
71e3aac0 AA	110	#if HPAGE_PMD_ORDER > MAX_ORDER
	111	#error "hugepages can't be allocated by the buddy allocator"
	112	#endif
60ab3244 AA	113	extern int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	114	unsigned long *vm_flags, int advice);
94fcc585 AA	115	extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
	116	unsigned long start,
	117	unsigned long end,
	118	long adjust_next);
025c5b24 NH	119	extern int __pmd_trans_huge_lock(pmd_t *pmd,
	120	struct vm_area_struct *vma);
	121	/* mmap_sem must be held on entry */
	122	static inline int pmd_trans_huge_lock(pmd_t *pmd,
	123	struct vm_area_struct *vma)
	124	{
	125	VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem));
	126	if (pmd_trans_huge(*pmd))
	127	return __pmd_trans_huge_lock(pmd, vma);
	128	else
	129	return 0;
	130	}
94fcc585 AA	131	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	132	unsigned long start,
	133	unsigned long end,
	134	long adjust_next)
	135	{
78f11a25	136	if (!vma->anon_vma \|\| vma->vm_ops)
94fcc585 AA	137	return;
	138	__vma_adjust_trans_huge(vma, start, end, adjust_next);
	139	}
2c888cfb RR	140	static inline int hpage_nr_pages(struct page *page)
	141	{
	142	if (unlikely(PageTransHuge(page)))
	143	return HPAGE_PMD_NR;
	144	return 1;
	145	}
22e5c47e AA	146	static inline struct page compound_trans_head(struct page page)
	147	{
	148	if (PageTail(page)) {
	149	struct page *head;
	150	head = page->first_page;
	151	smp_rmb();
	152	/*
	153	* head may be a dangling pointer.
	154	* __split_huge_page_refcount clears PageTail before
	155	* overwriting first_page, so if PageTail is still
	156	* there it means the head pointer isn't dangling.
	157	*/
	158	if (PageTail(page))
	159	return head;
	160	}
	161	return page;
	162	}
d10e63f2	163
4daae3b4 MG	164	extern int do_huge_pmd_numa_page(struct mm_struct mm, struct vm_area_struct vma,
4daae3b4 MG	165	unsigned long addr, pmd_t pmd, pmd_t *pmdp);
d10e63f2	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
	177	static inline int split_huge_page(struct page *page)
	178	{
	179	return 0;
	180	}
	181	#define split_huge_page_pmd(__mm, __pmd) \
	182	do { } while (0)
	183	#define wait_split_huge_page(__anon_vma, __pmd) \
	184	do { } while (0)
22e5c47e	185	#define compound_trans_head(page) compound_head(page)
60ab3244 AA	186	static inline int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	187	unsigned long *vm_flags, int advice)
0af4e98b AA	188	{
	189	BUG();
	190	return 0;
	191	}
94fcc585 AA	192	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	193	unsigned long start,
	194	unsigned long end,
	195	long adjust_next)
	196	{
	197	}
025c5b24 NH	198	static inline int pmd_trans_huge_lock(pmd_t *pmd,
	199	struct vm_area_struct *vma)
	200	{
	201	return 0;
	202	}
d10e63f2	203
4daae3b4 MG	204	static inline int do_huge_pmd_numa_page(struct mm_struct mm, struct vm_area_struct vma,
4daae3b4 MG	205	unsigned long addr, pmd_t pmd, pmd_t *pmdp)
d10e63f2	206	{
4daae3b4	207	return 0;
d10e63f2 MG	208	}
d10e63f2 MG	209
71e3aac0 AA	210	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	211
	212	#endif /* _LINUX_HUGE_MM_H */