[mirror_ubuntu-focal-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);

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 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(__anon_vma);				\
		anon_vma_unlock(__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);
/* 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(__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)
#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);
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 JW	33	extern int change_huge_pmd(struct vm_area_struct vma, pmd_t pmd,
cd7548ab JW	34	unsigned long addr, pgprot_t newprot);
71e3aac0 AA	35
	36	enum transparent_hugepage_flag {
	37	TRANSPARENT_HUGEPAGE_FLAG,
	38	TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
	39	TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
	40	TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
ba76149f	41	TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
71e3aac0 AA	42	#ifdef CONFIG_DEBUG_VM
	43	TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
	44	#endif
	45	};
	46
	47	enum page_check_address_pmd_flag {
	48	PAGE_CHECK_ADDRESS_PMD_FLAG,
	49	PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
	50	PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
	51	};
	52	extern pmd_t page_check_address_pmd(struct page page,
	53	struct mm_struct *mm,
	54	unsigned long address,
	55	enum page_check_address_pmd_flag flag);
	56
d8c37c48 NH	57	#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
	58	#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
	59
71e3aac0 AA	60	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	61	#define HPAGE_PMD_SHIFT HPAGE_SHIFT
	62	#define HPAGE_PMD_MASK HPAGE_MASK
	63	#define HPAGE_PMD_SIZE HPAGE_SIZE
	64
20995974 AS	65	extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
20995974 AS	66
71e3aac0	67	#define transparent_hugepage_enabled(__vma) \
a664b2d8 AA	68	((transparent_hugepage_flags & \
	69	(1<<TRANSPARENT_HUGEPAGE_FLAG) \|\| \
	70	(transparent_hugepage_flags & \
	71	(1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
	72	((__vma)->vm_flags & VM_HUGEPAGE))) && \
a7d6e4ec AA	73	!((__vma)->vm_flags & VM_NOHUGEPAGE) && \
a7d6e4ec AA	74	!is_vma_temporary_stack(__vma))
71e3aac0 AA	75	#define transparent_hugepage_defrag(__vma) \
	76	((transparent_hugepage_flags & \
	77	(1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) \|\| \
	78	(transparent_hugepage_flags & \
	79	(1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
	80	(__vma)->vm_flags & VM_HUGEPAGE))
	81	#ifdef CONFIG_DEBUG_VM
	82	#define transparent_hugepage_debug_cow() \
	83	(transparent_hugepage_flags & \
	84	(1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
	85	#else /* CONFIG_DEBUG_VM */
	86	#define transparent_hugepage_debug_cow() 0
	87	#endif /* CONFIG_DEBUG_VM */
	88
	89	extern unsigned long transparent_hugepage_flags;
	90	extern int copy_pte_range(struct mm_struct dst_mm, struct mm_struct src_mm,
	91	pmd_t dst_pmd, pmd_t src_pmd,
	92	struct vm_area_struct *vma,
	93	unsigned long addr, unsigned long end);
	94	extern int handle_pte_fault(struct mm_struct *mm,
	95	struct vm_area_struct *vma, unsigned long address,
	96	pte_t pte, pmd_t pmd, unsigned int flags);
	97	extern int split_huge_page(struct page *page);
e180377f KS	98	extern void __split_huge_page_pmd(struct vm_area_struct *vma,
	99	unsigned long address, pmd_t *pmd);
	100	#define split_huge_page_pmd(__vma, __address, __pmd) \
71e3aac0 AA	101	do { \
	102	pmd_t *____pmd = (__pmd); \
	103	if (unlikely(pmd_trans_huge(*____pmd))) \
e180377f KS	104	__split_huge_page_pmd(__vma, __address, \
e180377f KS	105	____pmd); \
71e3aac0 AA	106	} while (0)
	107	#define wait_split_huge_page(__anon_vma, __pmd) \
	108	do { \
	109	pmd_t *____pmd = (__pmd); \
2b575eb6 PZ	110	anon_vma_lock(__anon_vma); \
2b575eb6 PZ	111	anon_vma_unlock(__anon_vma); \
71e3aac0 AA	112	BUG_ON(pmd_trans_splitting(*____pmd) \|\| \
	113	pmd_trans_huge(*____pmd)); \
	114	} while (0)
e180377f KS	115	extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address,
e180377f KS	116	pmd_t *pmd);
71e3aac0 AA	117	#if HPAGE_PMD_ORDER > MAX_ORDER
	118	#error "hugepages can't be allocated by the buddy allocator"
	119	#endif
60ab3244 AA	120	extern int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	121	unsigned long *vm_flags, int advice);
94fcc585 AA	122	extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
	123	unsigned long start,
	124	unsigned long end,
	125	long adjust_next);
025c5b24 NH	126	extern int __pmd_trans_huge_lock(pmd_t *pmd,
	127	struct vm_area_struct *vma);
	128	/* mmap_sem must be held on entry */
	129	static inline int pmd_trans_huge_lock(pmd_t *pmd,
	130	struct vm_area_struct *vma)
	131	{
	132	VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem));
	133	if (pmd_trans_huge(*pmd))
	134	return __pmd_trans_huge_lock(pmd, vma);
	135	else
	136	return 0;
	137	}
94fcc585 AA	138	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	139	unsigned long start,
	140	unsigned long end,
	141	long adjust_next)
	142	{
78f11a25	143	if (!vma->anon_vma \|\| vma->vm_ops)
94fcc585 AA	144	return;
	145	__vma_adjust_trans_huge(vma, start, end, adjust_next);
	146	}
2c888cfb RR	147	static inline int hpage_nr_pages(struct page *page)
	148	{
	149	if (unlikely(PageTransHuge(page)))
	150	return HPAGE_PMD_NR;
	151	return 1;
	152	}
22e5c47e AA	153	static inline struct page compound_trans_head(struct page page)
	154	{
	155	if (PageTail(page)) {
	156	struct page *head;
	157	head = page->first_page;
	158	smp_rmb();
	159	/*
	160	* head may be a dangling pointer.
	161	* __split_huge_page_refcount clears PageTail before
	162	* overwriting first_page, so if PageTail is still
	163	* there it means the head pointer isn't dangling.
	164	*/
	165	if (PageTail(page))
	166	return head;
	167	}
	168	return page;
	169	}
71e3aac0	170	#else /* CONFIG_TRANSPARENT_HUGEPAGE */
d8c37c48 NH	171	#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
	172	#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
	173	#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
71e3aac0	174
2c888cfb RR	175	#define hpage_nr_pages(x) 1
2c888cfb RR	176
71e3aac0 AA	177	#define transparent_hugepage_enabled(__vma) 0
	178
	179	#define transparent_hugepage_flags 0UL
	180	static inline int split_huge_page(struct page *page)
	181	{
	182	return 0;
	183	}
e180377f	184	#define split_huge_page_pmd(__vma, __address, __pmd) \
71e3aac0 AA	185	do { } while (0)
	186	#define wait_split_huge_page(__anon_vma, __pmd) \
	187	do { } while (0)
e180377f KS	188	#define split_huge_page_pmd_mm(__mm, __address, __pmd) \
e180377f KS	189	do { } while (0)
22e5c47e	190	#define compound_trans_head(page) compound_head(page)
60ab3244 AA	191	static inline int hugepage_madvise(struct vm_area_struct *vma,
60ab3244 AA	192	unsigned long *vm_flags, int advice)
0af4e98b AA	193	{
	194	BUG();
	195	return 0;
	196	}
94fcc585 AA	197	static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
	198	unsigned long start,
	199	unsigned long end,
	200	long adjust_next)
	201	{
	202	}
025c5b24 NH	203	static inline int pmd_trans_huge_lock(pmd_t *pmd,
	204	struct vm_area_struct *vma)
	205	{
	206	return 0;
	207	}
71e3aac0 AA	208	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	209
	210	#endif /* _LINUX_HUGE_MM_H */