108 lines
2.9 KiB
C
108 lines
2.9 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* This file contains the routines for TLB flushing.
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* On machines where the MMU uses a hash table to store virtual to
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* physical translations, these routines flush entries from the
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* hash table also.
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* -- paulus
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*
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* Derived from arch/ppc/mm/init.c:
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
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* and Cort Dougan (PReP) (cort@cs.nmt.edu)
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* Copyright (C) 1996 Paul Mackerras
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*
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* Derived from "arch/i386/mm/init.c"
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* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
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*/
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/highmem.h>
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#include <linux/pagemap.h>
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#include <linux/export.h>
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#include <asm/tlbflush.h>
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#include <asm/tlb.h>
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#include <mm/mmu_decl.h>
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/*
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* TLB flushing:
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*
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* - flush_tlb_mm(mm) flushes the specified mm context TLB's
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* - flush_tlb_page(vma, vmaddr) flushes one page
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* - flush_tlb_range(vma, start, end) flushes a range of pages
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* - flush_tlb_kernel_range(start, end) flushes kernel pages
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*
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* since the hardware hash table functions as an extension of the
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* tlb as far as the linux tables are concerned, flush it too.
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* -- Cort
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*/
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/*
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* For each address in the range, find the pte for the address
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* and check _PAGE_HASHPTE bit; if it is set, find and destroy
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* the corresponding HPTE.
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*/
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void hash__flush_range(struct mm_struct *mm, unsigned long start, unsigned long end)
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{
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pmd_t *pmd;
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unsigned long pmd_end;
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int count;
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unsigned int ctx = mm->context.id;
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start &= PAGE_MASK;
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if (start >= end)
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return;
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end = (end - 1) | ~PAGE_MASK;
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pmd = pmd_off(mm, start);
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for (;;) {
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pmd_end = ((start + PGDIR_SIZE) & PGDIR_MASK) - 1;
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if (pmd_end > end)
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pmd_end = end;
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if (!pmd_none(*pmd)) {
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count = ((pmd_end - start) >> PAGE_SHIFT) + 1;
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flush_hash_pages(ctx, start, pmd_val(*pmd), count);
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}
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if (pmd_end == end)
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break;
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start = pmd_end + 1;
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++pmd;
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}
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}
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EXPORT_SYMBOL(hash__flush_range);
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/*
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* Flush all the (user) entries for the address space described by mm.
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*/
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void hash__flush_tlb_mm(struct mm_struct *mm)
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{
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struct vm_area_struct *mp;
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VMA_ITERATOR(vmi, mm, 0);
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/*
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* It is safe to iterate the vmas when called from dup_mmap,
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* holding mmap_lock. It would also be safe from unmap_region
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* or exit_mmap, but not from vmtruncate on SMP - but it seems
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* dup_mmap is the only SMP case which gets here.
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*/
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for_each_vma(vmi, mp)
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hash__flush_range(mp->vm_mm, mp->vm_start, mp->vm_end);
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}
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EXPORT_SYMBOL(hash__flush_tlb_mm);
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void hash__flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
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{
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struct mm_struct *mm;
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pmd_t *pmd;
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mm = (vmaddr < TASK_SIZE)? vma->vm_mm: &init_mm;
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pmd = pmd_off(mm, vmaddr);
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if (!pmd_none(*pmd))
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flush_hash_pages(mm->context.id, vmaddr, pmd_val(*pmd), 1);
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}
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EXPORT_SYMBOL(hash__flush_tlb_page);
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