arch/arm/include/asm/tlb.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  *  arch/arm/include/asm/tlb.h
   4  *
   5  *  Copyright (C) 2002 Russell King
   6  *
   7  *  Experimentation shows that on a StrongARM, it appears to be faster
   8  *  to use the "invalidate whole tlb" rather than "invalidate single
   9  *  tlb" for this.
  10  *
  11  *  This appears true for both the process fork+exit case, as well as
  12  *  the munmap-large-area case.
  13  */
  14 #ifndef __ASMARM_TLB_H
  15 #define __ASMARM_TLB_H
  16
  17 #include <asm/cacheflush.h>
  18
  19 #ifndef CONFIG_MMU
  20
  21 #include <linux/pagemap.h>
  22
  23 #define tlb_flush(tlb)  ((void) tlb)
  24
  25 #include <asm-generic/tlb.h>
  26
  27 #else /* !CONFIG_MMU */
  28
  29 #include <linux/swap.h>
  30 #include <asm/pgalloc.h>
  31 #include <asm/tlbflush.h>
  32
  33 static inline void __tlb_remove_table(void *_table)
  34 {
  35         free_page_and_swap_cache((struct page *)_table);
  36 }
  37
  38 #include <asm-generic/tlb.h>
  39
  40 static inline void
  41 __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte, unsigned long addr)
  42 {
  43         pgtable_pte_page_dtor(pte);
  44
  45 #ifndef CONFIG_ARM_LPAE
  46         /*
  47          * With the classic ARM MMU, a pte page has two corresponding pmd
  48          * entries, each covering 1MB.
  49          */
  50         addr = (addr & PMD_MASK) + SZ_1M;
  51         __tlb_adjust_range(tlb, addr - PAGE_SIZE, 2 * PAGE_SIZE);
  52 #endif
  53
  54         tlb_remove_table(tlb, pte);
  55 }
  56
  57 static inline void
  58 __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp, unsigned long addr)
  59 {
  60 #ifdef CONFIG_ARM_LPAE
  61         struct page *page = virt_to_page(pmdp);
  62
  63         tlb_remove_table(tlb, page);
  64 #endif
  65 }
  66
  67 #endif /* CONFIG_MMU */
  68 #endif