[linux-2.6-block.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), as well as write 
 * permission. 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_fix_spurious_fault(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);
	if (pte_accessible(pte))
		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	/*
cef23d9d RR	15	* Only sets the access flags (dirty, accessed), as well as write
cef23d9d RR	16	* permission. Furthermore, we know it always gets set to a "more
e2cda322 AA	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);
cef23d9d	30	flush_tlb_fix_spurious_fault(vma, address);
e2cda322 AA	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);
8d1acce4 RR	91	if (pte_accessible(pte))
8d1acce4 RR	92	flush_tlb_page(vma, address);
e2cda322 AA	93	return pte;
	94	}
	95	#endif
	96
	97	#ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH
b3697c02	98	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
e2cda322 AA	99	pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address,
	100	pmd_t *pmdp)
	101	{
	102	pmd_t pmd;
e2cda322 AA	103	VM_BUG_ON(address & ~HPAGE_PMD_MASK);
	104	pmd = pmdp_get_and_clear(vma->vm_mm, address, pmdp);
	105	flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
	106	return pmd;
	107	}
b3697c02	108	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
e2cda322 AA	109	#endif
	110
	111	#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
b3697c02	112	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
73636b1a CM	113	void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
73636b1a CM	114	pmd_t *pmdp)
e2cda322	115	{
e2cda322 AA	116	pmd_t pmd = pmd_mksplitting(*pmdp);
	117	VM_BUG_ON(address & ~HPAGE_PMD_MASK);
	118	set_pmd_at(vma->vm_mm, address, pmdp, pmd);
	119	/* tlb flush only to serialize against gup-fast */
	120	flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
e2cda322	121	}
b3697c02	122	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
e2cda322	123	#endif
e3ebcf64 GS	124
	125	#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
	126	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	127	void pgtable_trans_huge_deposit(struct mm_struct *mm, pgtable_t pgtable)
	128	{
	129	assert_spin_locked(&mm->page_table_lock);
	130
	131	/* FIFO */
	132	if (!mm->pmd_huge_pte)
	133	INIT_LIST_HEAD(&pgtable->lru);
	134	else
	135	list_add(&pgtable->lru, &mm->pmd_huge_pte->lru);
	136	mm->pmd_huge_pte = pgtable;
	137	}
	138	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	139	#endif
	140
	141	#ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
	142	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	143	/* no "address" argument so destroys page coloring of some arch */
	144	pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm)
	145	{
	146	pgtable_t pgtable;
	147
	148	assert_spin_locked(&mm->page_table_lock);
	149
	150	/* FIFO */
	151	pgtable = mm->pmd_huge_pte;
	152	if (list_empty(&pgtable->lru))
	153	mm->pmd_huge_pte = NULL;
	154	else {
	155	mm->pmd_huge_pte = list_entry(pgtable->lru.next,
	156	struct page, lru);
	157	list_del(&pgtable->lru);
	158	}
	159	return pgtable;
	160	}
	161	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	162	#endif
46dcde73 GS	163
	164	#ifndef __HAVE_ARCH_PMDP_INVALIDATE
	165	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	166	void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
	167	pmd_t *pmdp)
	168	{
	169	set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(*pmdp));
	170	flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
	171	}
	172	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	173	#endif