[mirror_ubuntu-artful-kernel.git] / mm / pgtable-generic.c

/*
 *  mm/pgtable-generic.c
 *
 *  Generic pgtable methods declared in asm-generic/pgtable.h
 *
 *  Copyright (C) 2010  Linus Torvalds
 */

#include <linux/pagemap.h>
#include <asm/tlb.h>
#include <asm-generic/pgtable.h>

#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
/*
 * Only sets the access flags (dirty, accessed, and
 * writable). Furthermore, we know it always gets set to a "more
 * permissive" setting, which allows most architectures to optimize
 * this. We return whether the PTE actually changed, which in turn
 * instructs the caller to do things like update__mmu_cache.  This
 * used to be done in the caller, but sparc needs minor faults to
 * force that call on sun4c so we changed this macro slightly
 */
int ptep_set_access_flags(struct vm_area_struct *vma,
			  unsigned long address, pte_t *ptep,
			  pte_t entry, int dirty)
{
	int changed = !pte_same(*ptep, entry);
	if (changed) {
		set_pte_at(vma->vm_mm, address, ptep, entry);
		flush_tlb_page(vma, address);
	}
	return changed;
}
#endif

#ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
int pmdp_set_access_flags(struct vm_area_struct *vma,
			  unsigned long address, pmd_t *pmdp,
			  pmd_t entry, int dirty)
{
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	int changed = !pmd_same(*pmdp, entry);
	VM_BUG_ON(address & ~HPAGE_PMD_MASK);
	if (changed) {
		set_pmd_at(vma->vm_mm, address, pmdp, entry);
		flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
	}
	return changed;
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
	BUG();
	return 0;
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
}
#endif

#ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
int ptep_clear_flush_young(struct vm_area_struct *vma,
			   unsigned long address, pte_t *ptep)
{
	int young;
	young = ptep_test_and_clear_young(vma, address, ptep);
	if (young)
		flush_tlb_page(vma, address);
	return young;
}
#endif

#ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
int pmdp_clear_flush_young(struct vm_area_struct *vma,
			   unsigned long address, pmd_t *pmdp)
{
	int young;
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	VM_BUG_ON(address & ~HPAGE_PMD_MASK);
#else
	BUG();
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	young = pmdp_test_and_clear_young(vma, address, pmdp);
	if (young)
		flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
	return young;
}
#endif

#ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
		       pte_t *ptep)
{
	pte_t pte;
	pte = ptep_get_and_clear((vma)->vm_mm, address, ptep);
	flush_tlb_page(vma, address);
	return pte;
}
#endif

#ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address,
		       pmd_t *pmdp)
{
	pmd_t pmd;
	VM_BUG_ON(address & ~HPAGE_PMD_MASK);
	pmd = pmdp_get_and_clear(vma->vm_mm, address, pmdp);
	flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
	return pmd;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif

#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
			  pmd_t *pmdp)
{
	pmd_t pmd = pmd_mksplitting(*pmdp);
	VM_BUG_ON(address & ~HPAGE_PMD_MASK);
	set_pmd_at(vma->vm_mm, address, pmdp, pmd);
	/* tlb flush only to serialize against gup-fast */
	flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif

#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
void pgtable_trans_huge_deposit(struct mm_struct *mm, pgtable_t pgtable)
{
	assert_spin_locked(&mm->page_table_lock);

	/* FIFO */
	if (!mm->pmd_huge_pte)
		INIT_LIST_HEAD(&pgtable->lru);
	else
		list_add(&pgtable->lru, &mm->pmd_huge_pte->lru);
	mm->pmd_huge_pte = pgtable;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif

#ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
/* no "address" argument so destroys page coloring of some arch */
pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm)
{
	pgtable_t pgtable;

	assert_spin_locked(&mm->page_table_lock);

	/* FIFO */
	pgtable = mm->pmd_huge_pte;
	if (list_empty(&pgtable->lru))
		mm->pmd_huge_pte = NULL;
	else {
		mm->pmd_huge_pte = list_entry(pgtable->lru.next,
					      struct page, lru);
		list_del(&pgtable->lru);
	}
	return pgtable;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif

#ifndef __HAVE_ARCH_PMDP_INVALIDATE
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
		     pmd_t *pmdp)
{
	set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(*pmdp));
	flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif
Commit	Line	Data
e2cda322 AA	1	/*
	2	* mm/pgtable-generic.c
	3	*
	4	* Generic pgtable methods declared in asm-generic/pgtable.h
	5	*
	6	* Copyright (C) 2010 Linus Torvalds
	7	*/
	8
f95ba941	9	#include <linux/pagemap.h>
e2cda322 AA	10	#include <asm/tlb.h>
	11	#include <asm-generic/pgtable.h>
	12
	13	#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
	14	/*
	15	* Only sets the access flags (dirty, accessed, and
	16	* writable). Furthermore, we know it always gets set to a "more
	17	* permissive" setting, which allows most architectures to optimize
	18	* this. We return whether the PTE actually changed, which in turn
	19	* instructs the caller to do things like update__mmu_cache. This
	20	* used to be done in the caller, but sparc needs minor faults to
	21	* force that call on sun4c so we changed this macro slightly
	22	*/
	23	int ptep_set_access_flags(struct vm_area_struct *vma,
	24	unsigned long address, pte_t *ptep,
	25	pte_t entry, int dirty)
	26	{
	27	int changed = !pte_same(*ptep, entry);
	28	if (changed) {
	29	set_pte_at(vma->vm_mm, address, ptep, entry);
	30	flush_tlb_page(vma, address);
	31	}
	32	return changed;
	33	}
	34	#endif
	35
	36	#ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
	37	int pmdp_set_access_flags(struct vm_area_struct *vma,
	38	unsigned long address, pmd_t *pmdp,
	39	pmd_t entry, int dirty)
	40	{
	41	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	42	int changed = !pmd_same(*pmdp, entry);
	43	VM_BUG_ON(address & ~HPAGE_PMD_MASK);
	44	if (changed) {
	45	set_pmd_at(vma->vm_mm, address, pmdp, entry);
	46	flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
	47	}
	48	return changed;
	49	#else /* CONFIG_TRANSPARENT_HUGEPAGE */
	50	BUG();
	51	return 0;
	52	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	53	}
	54	#endif
	55
	56	#ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
	57	int ptep_clear_flush_young(struct vm_area_struct *vma,
	58	unsigned long address, pte_t *ptep)
	59	{
	60	int young;
	61	young = ptep_test_and_clear_young(vma, address, ptep);
	62	if (young)
	63	flush_tlb_page(vma, address);
	64	return young;
	65	}
	66	#endif
	67
	68	#ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
	69	int pmdp_clear_flush_young(struct vm_area_struct *vma,
	70	unsigned long address, pmd_t *pmdp)
	71	{
	72	int young;
d8c37c48 NH	73	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	74	VM_BUG_ON(address & ~HPAGE_PMD_MASK);
	75	#else
e2cda322 AA	76	BUG();
e2cda322 AA	77	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
e2cda322 AA	78	young = pmdp_test_and_clear_young(vma, address, pmdp);
	79	if (young)
	80	flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
	81	return young;
	82	}
	83	#endif
	84
	85	#ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
	86	pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
	87	pte_t *ptep)
	88	{
	89	pte_t pte;
	90	pte = ptep_get_and_clear((vma)->vm_mm, address, ptep);
	91	flush_tlb_page(vma, address);
	92	return pte;
	93	}
	94	#endif
	95
	96	#ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH
b3697c02	97	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
e2cda322 AA	98	pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address,
	99	pmd_t *pmdp)
	100	{
	101	pmd_t pmd;
e2cda322 AA	102	VM_BUG_ON(address & ~HPAGE_PMD_MASK);
	103	pmd = pmdp_get_and_clear(vma->vm_mm, address, pmdp);
	104	flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
	105	return pmd;
	106	}
b3697c02	107	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
e2cda322 AA	108	#endif
	109
	110	#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
b3697c02	111	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
73636b1a CM	112	void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
73636b1a CM	113	pmd_t *pmdp)
e2cda322	114	{
e2cda322 AA	115	pmd_t pmd = pmd_mksplitting(*pmdp);
	116	VM_BUG_ON(address & ~HPAGE_PMD_MASK);
	117	set_pmd_at(vma->vm_mm, address, pmdp, pmd);
	118	/* tlb flush only to serialize against gup-fast */
	119	flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
e2cda322	120	}
b3697c02	121	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
e2cda322	122	#endif
e3ebcf64 GS	123
	124	#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
	125	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	126	void pgtable_trans_huge_deposit(struct mm_struct *mm, pgtable_t pgtable)
	127	{
	128	assert_spin_locked(&mm->page_table_lock);
	129
	130	/* FIFO */
	131	if (!mm->pmd_huge_pte)
	132	INIT_LIST_HEAD(&pgtable->lru);
	133	else
	134	list_add(&pgtable->lru, &mm->pmd_huge_pte->lru);
	135	mm->pmd_huge_pte = pgtable;
	136	}
	137	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	138	#endif
	139
	140	#ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
	141	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	142	/* no "address" argument so destroys page coloring of some arch */
	143	pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm)
	144	{
	145	pgtable_t pgtable;
	146
	147	assert_spin_locked(&mm->page_table_lock);
	148
	149	/* FIFO */
	150	pgtable = mm->pmd_huge_pte;
	151	if (list_empty(&pgtable->lru))
	152	mm->pmd_huge_pte = NULL;
	153	else {
	154	mm->pmd_huge_pte = list_entry(pgtable->lru.next,
	155	struct page, lru);
	156	list_del(&pgtable->lru);
	157	}
	158	return pgtable;
	159	}
	160	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	161	#endif
46dcde73 GS	162
	163	#ifndef __HAVE_ARCH_PMDP_INVALIDATE
	164	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	165	void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
	166	pmd_t *pmdp)
	167	{
	168	set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(*pmdp));
	169	flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
	170	}
	171	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	172	#endif