^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * This file contains the routines for TLB flushing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * On machines where the MMU uses a hash table to store virtual to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * physical translations, these routines flush entries from the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * hash table also.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * -- paulus
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Derived from arch/ppc/mm/init.c:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * and Cort Dougan (PReP) (cort@cs.nmt.edu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Copyright (C) 1996 Paul Mackerras
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * Derived from "arch/i386/mm/init.c"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/highmem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <asm/tlbflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <asm/tlb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <mm/mmu_decl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * Called when unmapping pages to flush entries from the TLB/hash table.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) void flush_hash_entry(struct mm_struct *mm, pte_t *ptep, unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) unsigned long ptephys;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) if (Hash) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) ptephys = __pa(ptep) & PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) flush_hash_pages(mm->context.id, addr, ptephys, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) EXPORT_SYMBOL(flush_hash_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * Called at the end of a mmu_gather operation to make sure the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * TLB flush is completely done.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) void tlb_flush(struct mmu_gather *tlb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) if (!Hash) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * 603 needs to flush the whole TLB here since
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * it doesn't use a hash table.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) _tlbia();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * TLB flushing:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * - flush_tlb_mm(mm) flushes the specified mm context TLB's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * - flush_tlb_page(vma, vmaddr) flushes one page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * - flush_tlb_range(vma, start, end) flushes a range of pages
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * - flush_tlb_kernel_range(start, end) flushes kernel pages
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * since the hardware hash table functions as an extension of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * tlb as far as the linux tables are concerned, flush it too.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * -- Cort
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) static void flush_range(struct mm_struct *mm, unsigned long start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) pmd_t *pmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) unsigned long pmd_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) int count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) unsigned int ctx = mm->context.id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) start &= PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) if (!Hash) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (end - start <= PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) _tlbie(start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) _tlbia();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (start >= end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) end = (end - 1) | ~PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) pmd = pmd_off(mm, start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) for (;;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) pmd_end = ((start + PGDIR_SIZE) & PGDIR_MASK) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (pmd_end > end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) pmd_end = end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if (!pmd_none(*pmd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) count = ((pmd_end - start) >> PAGE_SHIFT) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) flush_hash_pages(ctx, start, pmd_val(*pmd), count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (pmd_end == end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) start = pmd_end + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) ++pmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * Flush kernel TLB entries in the given range
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) void flush_tlb_kernel_range(unsigned long start, unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) flush_range(&init_mm, start, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) EXPORT_SYMBOL(flush_tlb_kernel_range);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) * Flush all the (user) entries for the address space described by mm.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) void flush_tlb_mm(struct mm_struct *mm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) struct vm_area_struct *mp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) if (!Hash) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) _tlbia();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) * It is safe to go down the mm's list of vmas when called
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) * from dup_mmap, holding mmap_lock. It would also be safe from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) * unmap_region or exit_mmap, but not from vmtruncate on SMP -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) * but it seems dup_mmap is the only SMP case which gets here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) for (mp = mm->mmap; mp != NULL; mp = mp->vm_next)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) flush_range(mp->vm_mm, mp->vm_start, mp->vm_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) EXPORT_SYMBOL(flush_tlb_mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) struct mm_struct *mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) pmd_t *pmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (!Hash) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) _tlbie(vmaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) mm = (vmaddr < TASK_SIZE)? vma->vm_mm: &init_mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) pmd = pmd_off(mm, vmaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) if (!pmd_none(*pmd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) flush_hash_pages(mm->context.id, vmaddr, pmd_val(*pmd), 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) EXPORT_SYMBOL(flush_tlb_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) * For each address in the range, find the pte for the address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) * and check _PAGE_HASHPTE bit; if it is set, find and destroy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) * the corresponding HPTE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) flush_range(vma->vm_mm, start, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) EXPORT_SYMBOL(flush_tlb_range);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) void __init early_init_mmu(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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