Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 *  mm/pgtable-generic.c
 *
 *  Generic pgtable methods declared in linux/pgtable.h
 *
 *  Copyright (C) 2010  Linus Torvalds
 */
 
#include <linux/pagemap.h>
#include <linux/hugetlb.h>
#include <linux/pgtable.h>
#include <asm/tlb.h>
 
/*
 * If a p?d_bad entry is found while walking page tables, report
 * the error, before resetting entry to p?d_none.  Usually (but
 * very seldom) called out from the p?d_none_or_clear_bad macros.
 */
 
void pgd_clear_bad(pgd_t *pgd)
{
<------>pgd_ERROR(*pgd);
<------>pgd_clear(pgd);
}
 
#ifndef __PAGETABLE_P4D_FOLDED
void p4d_clear_bad(p4d_t *p4d)
{
<------>p4d_ERROR(*p4d);
<------>p4d_clear(p4d);
}
#endif
 
#ifndef __PAGETABLE_PUD_FOLDED
void pud_clear_bad(pud_t *pud)
{
<------>pud_ERROR(*pud);
<------>pud_clear(pud);
}
#endif
 
/*
 * Note that the pmd variant below can't be stub'ed out just as for p4d/pud
 * above. pmd folding is special and typically pmd_* macros refer to upper
 * level even when folded
 */
void pmd_clear_bad(pmd_t *pmd)
{
<------>pmd_ERROR(*pmd);
<------>pmd_clear(pmd);
}
 
#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_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_PTEP_CLEAR_FLUSH
pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
<------><------>       pte_t *ptep)
{
<------>struct mm_struct *mm = (vma)->vm_mm;
<------>pte_t pte;
<------>pte = ptep_get_and_clear(mm, address, ptep);
<------>if (pte_accessible(mm, pte))
<------><------>flush_tlb_page(vma, address);
<------>return pte;
}
#endif
 
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 
#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)
{
<------>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_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
<------>}
<------>return changed;
}
#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;
<------>VM_BUG_ON(address & ~HPAGE_PMD_MASK);
<------>young = pmdp_test_and_clear_young(vma, address, pmdp);
<------>if (young)
<------><------>flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
<------>return young;
}
#endif
 
#ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
<------><------><------>    pmd_t *pmdp)
{
<------>pmd_t pmd;
<------>VM_BUG_ON(address & ~HPAGE_PMD_MASK);
<------>VM_BUG_ON(pmd_present(*pmdp) && !pmd_trans_huge(*pmdp) &&
<------><------><------>   !pmd_devmap(*pmdp));
<------>pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
<------>flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
<------>return pmd;
}
 
#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
pud_t pudp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
<------><------><------>    pud_t *pudp)
{
<------>pud_t pud;
 
<------>VM_BUG_ON(address & ~HPAGE_PUD_MASK);
<------>VM_BUG_ON(!pud_trans_huge(*pudp) && !pud_devmap(*pudp));
<------>pud = pudp_huge_get_and_clear(vma->vm_mm, address, pudp);
<------>flush_pud_tlb_range(vma, address, address + HPAGE_PUD_SIZE);
<------>return pud;
}
#endif
#endif
 
#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
<------><------><------><------>pgtable_t pgtable)
{
<------>assert_spin_locked(pmd_lockptr(mm, pmdp));
 
<------>/* FIFO */
<------>if (!pmd_huge_pte(mm, pmdp))
<------><------>INIT_LIST_HEAD(&pgtable->lru);
<------>else
<------><------>list_add(&pgtable->lru, &pmd_huge_pte(mm, pmdp)->lru);
<------>pmd_huge_pte(mm, pmdp) = pgtable;
}
#endif
 
#ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
/* no "address" argument so destroys page coloring of some arch */
pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
{
<------>pgtable_t pgtable;
 
<------>assert_spin_locked(pmd_lockptr(mm, pmdp));
 
<------>/* FIFO */
<------>pgtable = pmd_huge_pte(mm, pmdp);
<------>pmd_huge_pte(mm, pmdp) = list_first_entry_or_null(&pgtable->lru,
<------><------><------><------><------><------><------>  struct page, lru);
<------>if (pmd_huge_pte(mm, pmdp))
<------><------>list_del(&pgtable->lru);
<------>return pgtable;
}
#endif
 
#ifndef __HAVE_ARCH_PMDP_INVALIDATE
pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
<------><------>     pmd_t *pmdp)
{
<------>pmd_t old = pmdp_establish(vma, address, pmdp, pmd_mkinvalid(*pmdp));
<------>flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
<------>return old;
}
#endif
 
#ifndef pmdp_collapse_flush
pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
<------><------><------>  pmd_t *pmdp)
{
<------>/*
<------> * pmd and hugepage pte format are same. So we could
<------> * use the same function.
<------> */
<------>pmd_t pmd;
 
<------>VM_BUG_ON(address & ~HPAGE_PMD_MASK);
<------>VM_BUG_ON(pmd_trans_huge(*pmdp));
<------>pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
 
<------>/* collapse entails shooting down ptes not pmd */
<------>flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
<------>return pmd;
}
#endif
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */