mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 05:34:00 +08:00
8d1acce453
If ptep_clear_flush() is called to clear a page table entry that is accessible anyway by the CPU, eg. a _PAGE_PROTNONE page table entry, there is no need to flush the TLB on remote CPUs. Signed-off-by: Rik van Riel <riel@redhat.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/n/tip-vm3rkzevahelwhejx5uwm8ex@git.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
174 lines
4.6 KiB
C
174 lines
4.6 KiB
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
|