arch/arm64/include/asm/tlb.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Based on arch/arm/include/asm/tlb.h
   4  *
   5  * Copyright (C) 2002 Russell King
   6  * Copyright (C) 2012 ARM Ltd.
   7  */
   8 #ifndef __ASM_TLB_H
   9 #define __ASM_TLB_H
  10
  11 #include <linux/pagemap.h>
  12 #include <linux/swap.h>
  13
  14 static inline void __tlb_remove_table(void *_table)
  15 {
  16         free_page_and_swap_cache((struct page *)_table);
  17 }
  18
  19 #define tlb_flush tlb_flush
  20 static void tlb_flush(struct mmu_gather *tlb);
  21
  22 #include <asm-generic/tlb.h>
  23
  24 /*
  25  * get the tlbi levels in arm64.  Default value is 0 if more than one
  26  * of cleared_* is set or neither is set.
  27  * Arm64 doesn't support p4ds now.
  28  */
  29 static inline int tlb_get_level(struct mmu_gather *tlb)
  30 {
  31         if (tlb->cleared_ptes && !(tlb->cleared_pmds ||
  32                                    tlb->cleared_puds ||
  33                                    tlb->cleared_p4ds))
  34                 return 3;
  35
  36         if (tlb->cleared_pmds && !(tlb->cleared_ptes ||
  37                                    tlb->cleared_puds ||
  38                                    tlb->cleared_p4ds))
  39                 return 2;
  40
  41         if (tlb->cleared_puds && !(tlb->cleared_ptes ||
  42                                    tlb->cleared_pmds ||
  43                                    tlb->cleared_p4ds))
  44                 return 1;
  45
  46         return 0;
  47 }
  48
  49 static inline void tlb_flush(struct mmu_gather *tlb)
  50 {
  51         struct vm_area_struct vma = TLB_FLUSH_VMA(tlb->mm, 0);
  52         bool last_level = !tlb->freed_tables;
  53         unsigned long stride = tlb_get_unmap_size(tlb);
  54         int tlb_level = tlb_get_level(tlb);
  55
  56         /*
  57          * If we're tearing down the address space then we only care about
  58          * invalidating the walk-cache, since the ASID allocator won't
  59          * reallocate our ASID without invalidating the entire TLB.
  60          */
  61         if (tlb->fullmm) {
  62                 if (!last_level)
  63                         flush_tlb_mm(tlb->mm);
  64                 return;
  65         }
  66
  67         __flush_tlb_range(&vma, tlb->start, tlb->end, stride,
  68                           last_level, tlb_level);
  69 }
  70
  71 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
  72                                   unsigned long addr)
  73 {
  74         pgtable_pte_page_dtor(pte);
  75         tlb_remove_table(tlb, pte);
  76 }
  77
  78 #if CONFIG_PGTABLE_LEVELS > 2
  79 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
  80                                   unsigned long addr)
  81 {
  82         struct page *page = virt_to_page(pmdp);
  83
  84         pgtable_pmd_page_dtor(page);
  85         tlb_remove_table(tlb, page);
  86 }
  87 #endif
  88
  89 #if CONFIG_PGTABLE_LEVELS > 3
  90 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pudp,
  91                                   unsigned long addr)
  92 {
  93         tlb_remove_table(tlb, virt_to_page(pudp));
  94 }
  95 #endif
  96
  97 #endif