forked from Minki/linux
157d4d0620
This should not have any impact on hash, because hash does tlb invalidate with every pte update and we don't implement flush_tlb_* functions for hash. With radix we should make an explicit call to flush tlb outside pte update. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
/*
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* Copyright 2015-2016, Aneesh Kumar K.V, IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/sched.h>
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#include <asm/pgalloc.h>
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#include <asm/tlb.h>
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#include "mmu_decl.h"
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#include <trace/events/thp.h>
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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/*
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* This is called when relaxing access to a hugepage. It's also called in the page
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* fault path when we don't hit any of the major fault cases, ie, a minor
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* update of _PAGE_ACCESSED, _PAGE_DIRTY, etc... The generic code will have
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* handled those two for us, we additionally deal with missing execute
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* permission here on some processors
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*/
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int pmdp_set_access_flags(struct vm_area_struct *vma, unsigned long address,
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pmd_t *pmdp, pmd_t entry, int dirty)
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{
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int changed;
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#ifdef CONFIG_DEBUG_VM
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WARN_ON(!pmd_trans_huge(*pmdp));
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assert_spin_locked(&vma->vm_mm->page_table_lock);
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#endif
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changed = !pmd_same(*(pmdp), entry);
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if (changed) {
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__ptep_set_access_flags(pmdp_ptep(pmdp), pmd_pte(entry));
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flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
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}
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return changed;
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}
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int pmdp_test_and_clear_young(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp)
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{
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return __pmdp_test_and_clear_young(vma->vm_mm, address, pmdp);
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}
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/*
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* set a new huge pmd. We should not be called for updating
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* an existing pmd entry. That should go via pmd_hugepage_update.
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*/
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void set_pmd_at(struct mm_struct *mm, unsigned long addr,
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pmd_t *pmdp, pmd_t pmd)
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{
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#ifdef CONFIG_DEBUG_VM
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WARN_ON(pte_present(pmd_pte(*pmdp)) && !pte_protnone(pmd_pte(*pmdp)));
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assert_spin_locked(&mm->page_table_lock);
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WARN_ON(!pmd_trans_huge(pmd));
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#endif
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trace_hugepage_set_pmd(addr, pmd_val(pmd));
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return set_pte_at(mm, addr, pmdp_ptep(pmdp), pmd_pte(pmd));
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}
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/*
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* We use this to invalidate a pmdp entry before switching from a
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* hugepte to regular pmd entry.
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*/
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void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
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pmd_t *pmdp)
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{
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pmd_hugepage_update(vma->vm_mm, address, pmdp, _PAGE_PRESENT, 0);
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flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
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/*
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* This ensures that generic code that rely on IRQ disabling
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* to prevent a parallel THP split work as expected.
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*/
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kick_all_cpus_sync();
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}
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static pmd_t pmd_set_protbits(pmd_t pmd, pgprot_t pgprot)
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{
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return __pmd(pmd_val(pmd) | pgprot_val(pgprot));
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}
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pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot)
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{
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unsigned long pmdv;
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pmdv = (pfn << PAGE_SHIFT) & PTE_RPN_MASK;
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return pmd_set_protbits(__pmd(pmdv), pgprot);
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}
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pmd_t mk_pmd(struct page *page, pgprot_t pgprot)
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{
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return pfn_pmd(page_to_pfn(page), pgprot);
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}
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pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
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{
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unsigned long pmdv;
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pmdv = pmd_val(pmd);
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pmdv &= _HPAGE_CHG_MASK;
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return pmd_set_protbits(__pmd(pmdv), newprot);
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}
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/*
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* This is called at the end of handling a user page fault, when the
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* fault has been handled by updating a HUGE PMD entry in the linux page tables.
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* We use it to preload an HPTE into the hash table corresponding to
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* the updated linux HUGE PMD entry.
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*/
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void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long addr,
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pmd_t *pmd)
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{
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return;
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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