114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras/* 214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * This file contains the routines for TLB flushing. 314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * On machines where the MMU uses a hash table to store virtual to 414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * physical translations, these routines flush entries from the 514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * hash table also. 614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * -- paulus 714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * 814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Derived from arch/ppc/mm/init.c: 914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 1014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * 1114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) 1214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * and Cort Dougan (PReP) (cort@cs.nmt.edu) 1314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Copyright (C) 1996 Paul Mackerras 1414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * 1514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Derived from "arch/i386/mm/init.c" 1614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds 1714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * 1814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * This program is free software; you can redistribute it and/or 1914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * modify it under the terms of the GNU General Public License 2014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * as published by the Free Software Foundation; either version 2114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * 2 of the License, or (at your option) any later version. 2214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * 2314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 2414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 2514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#include <linux/kernel.h> 2614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#include <linux/mm.h> 2714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#include <linux/init.h> 2814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#include <linux/highmem.h> 2997d22d26b4a5aefc5a18ac81ef4e7b46da451426Mariusz Kozlowski#include <linux/pagemap.h> 30930879488495e19178f8c63297fd4b9b4df9e9fcPaul Gortmaker#include <linux/export.h> 3197d22d26b4a5aefc5a18ac81ef4e7b46da451426Mariusz Kozlowski 3214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#include <asm/tlbflush.h> 3314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#include <asm/tlb.h> 3414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 3514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras#include "mmu_decl.h" 3614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 3714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras/* 3814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Called when unmapping pages to flush entries from the TLB/hash table. 3914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 4014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasvoid flush_hash_entry(struct mm_struct *mm, pte_t *ptep, unsigned long addr) 4114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 4214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras unsigned long ptephys; 4314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 4414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (Hash != 0) { 4514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras ptephys = __pa(ptep) & PAGE_MASK; 466218a761bbc27acc65248c80024875bcc06d52b1Paul Mackerras flush_hash_pages(mm->context.id, addr, ptephys, 1); 4714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 4814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 494ee7084eb11e00eb02dc8435fd18273a61ffa9bfBecky BruceEXPORT_SYMBOL(flush_hash_entry); 5014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 5114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras/* 5214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Called by ptep_set_access_flags, must flush on CPUs for which the 5314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * DSI handler can't just "fixup" the TLB on a write fault 5414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 5514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasvoid flush_tlb_page_nohash(struct vm_area_struct *vma, unsigned long addr) 5614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 5714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (Hash != 0) 5814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return; 5914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras _tlbie(addr); 6014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 6114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 6214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras/* 6314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Called at the end of a mmu_gather operation to make sure the 6414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * TLB flush is completely done. 6514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 6614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasvoid tlb_flush(struct mmu_gather *tlb) 6714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 6814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (Hash == 0) { 6914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras /* 7014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * 603 needs to flush the whole TLB here since 7114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * it doesn't use a hash table. 7214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 7314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras _tlbia(); 7414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 7514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 7614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 7714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras/* 7814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * TLB flushing: 7914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * 8014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * - flush_tlb_mm(mm) flushes the specified mm context TLB's 8114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * - flush_tlb_page(vma, vmaddr) flushes one page 8214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * - flush_tlb_range(vma, start, end) flushes a range of pages 8314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * - flush_tlb_kernel_range(start, end) flushes kernel pages 8414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * 8514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * since the hardware hash table functions as an extension of the 8614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * tlb as far as the linux tables are concerned, flush it too. 8714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * -- Cort 8814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 8914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 9014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasstatic void flush_range(struct mm_struct *mm, unsigned long start, 9114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras unsigned long end) 9214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 9314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pmd_t *pmd; 9414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras unsigned long pmd_end; 9514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras int count; 966218a761bbc27acc65248c80024875bcc06d52b1Paul Mackerras unsigned int ctx = mm->context.id; 9714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 9814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (Hash == 0) { 9914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras _tlbia(); 10014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return; 10114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 10214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras start &= PAGE_MASK; 10314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (start >= end) 10414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return; 10514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras end = (end - 1) | ~PAGE_MASK; 106f1a1eb299a8422c3e8d41753095bec44b2493398David Gibson pmd = pmd_offset(pud_offset(pgd_offset(mm, start), start), start); 10714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras for (;;) { 10814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pmd_end = ((start + PGDIR_SIZE) & PGDIR_MASK) - 1; 10914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (pmd_end > end) 11014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pmd_end = end; 11114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (!pmd_none(*pmd)) { 11214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras count = ((pmd_end - start) >> PAGE_SHIFT) + 1; 11314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras flush_hash_pages(ctx, start, pmd_val(*pmd), count); 11414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 11514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (pmd_end == end) 11614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras break; 11714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras start = pmd_end + 1; 11814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras ++pmd; 11914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 12014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 12114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 12214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras/* 12314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Flush kernel TLB entries in the given range 12414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 12514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasvoid flush_tlb_kernel_range(unsigned long start, unsigned long end) 12614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 12714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras flush_range(&init_mm, start, end); 12814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 129f048aace29e007f2b642097e2da8231e0e9cce2dBenjamin HerrenschmidtEXPORT_SYMBOL(flush_tlb_kernel_range); 13014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 13114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras/* 13214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * Flush all the (user) entries for the address space described by mm. 13314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 13414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasvoid flush_tlb_mm(struct mm_struct *mm) 13514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 13614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras struct vm_area_struct *mp; 13714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 13814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (Hash == 0) { 13914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras _tlbia(); 14014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return; 14114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 14214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 14301edcd891c3e9f4bb992ff2ceb69836bf76f8ddfHugh Dickins /* 14401edcd891c3e9f4bb992ff2ceb69836bf76f8ddfHugh Dickins * It is safe to go down the mm's list of vmas when called 14501edcd891c3e9f4bb992ff2ceb69836bf76f8ddfHugh Dickins * from dup_mmap, holding mmap_sem. It would also be safe from 14601edcd891c3e9f4bb992ff2ceb69836bf76f8ddfHugh Dickins * unmap_region or exit_mmap, but not from vmtruncate on SMP - 14701edcd891c3e9f4bb992ff2ceb69836bf76f8ddfHugh Dickins * but it seems dup_mmap is the only SMP case which gets here. 14801edcd891c3e9f4bb992ff2ceb69836bf76f8ddfHugh Dickins */ 14914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras for (mp = mm->mmap; mp != NULL; mp = mp->vm_next) 15014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras flush_range(mp->vm_mm, mp->vm_start, mp->vm_end); 15114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 152f048aace29e007f2b642097e2da8231e0e9cce2dBenjamin HerrenschmidtEXPORT_SYMBOL(flush_tlb_mm); 15314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 15414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasvoid flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr) 15514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 15614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras struct mm_struct *mm; 15714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras pmd_t *pmd; 15814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 15914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (Hash == 0) { 16014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras _tlbie(vmaddr); 16114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras return; 16214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras } 16314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras mm = (vmaddr < TASK_SIZE)? vma->vm_mm: &init_mm; 164f1a1eb299a8422c3e8d41753095bec44b2493398David Gibson pmd = pmd_offset(pud_offset(pgd_offset(mm, vmaddr), vmaddr), vmaddr); 16514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras if (!pmd_none(*pmd)) 1666218a761bbc27acc65248c80024875bcc06d52b1Paul Mackerras flush_hash_pages(mm->context.id, vmaddr, pmd_val(*pmd), 1); 16714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 168f048aace29e007f2b642097e2da8231e0e9cce2dBenjamin HerrenschmidtEXPORT_SYMBOL(flush_tlb_page); 16914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras 17014cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras/* 17114cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * For each address in the range, find the pte for the address 17214cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * and check _PAGE_HASHPTE bit; if it is set, find and destroy 17314cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras * the corresponding HPTE. 17414cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras */ 17514cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerrasvoid flush_tlb_range(struct vm_area_struct *vma, unsigned long start, 17614cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras unsigned long end) 17714cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras{ 17814cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras flush_range(vma->vm_mm, start, end); 17914cf11af6cf608eb8c23e989ddb17a715ddce109Paul Mackerras} 180f048aace29e007f2b642097e2da8231e0e9cce2dBenjamin HerrenschmidtEXPORT_SYMBOL(flush_tlb_range); 18191b191c71eae79c0e652c52a968d06cd96b539c5Dave Kleikamp 18291b191c71eae79c0e652c52a968d06cd96b539c5Dave Kleikampvoid __init early_init_mmu(void) 18391b191c71eae79c0e652c52a968d06cd96b539c5Dave Kleikamp{ 18491b191c71eae79c0e652c52a968d06cd96b539c5Dave Kleikamp} 185