arch/sh/include/asm/tlb.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_SH_TLB_H
   3 #define __ASM_SH_TLB_H
   4
   5 #ifdef CONFIG_SUPERH64
   6 # include <asm/tlb_64.h>
   7 #endif
   8
   9 #ifndef __ASSEMBLY__
  10 #include <linux/pagemap.h>
  11
  12 #ifdef CONFIG_MMU
  13 #include <linux/swap.h>
  14 #include <asm/pgalloc.h>
  15 #include <asm/tlbflush.h>
  16 #include <asm/mmu_context.h>
  17
  18 /*
  19  * TLB handling.  This allows us to remove pages from the page
  20  * tables, and efficiently handle the TLB issues.
  21  */
  22 struct mmu_gather {
  23         struct mm_struct        *mm;
  24         unsigned int            fullmm;
  25         unsigned long           start, end;
  26 };
  27
  28 static inline void init_tlb_gather(struct mmu_gather *tlb)
  29 {
  30         tlb->start = TASK_SIZE;
  31         tlb->end = 0;
  32
  33         if (tlb->fullmm) {
  34                 tlb->start = 0;
  35                 tlb->end = TASK_SIZE;
  36         }
  37 }
  38
  39 static inline void
  40 arch_tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm,
  41                 unsigned long start, unsigned long end)
  42 {
  43         tlb->mm = mm;
  44         tlb->start = start;
  45         tlb->end = end;
  46         tlb->fullmm = !(start | (end+1));
  47
  48         init_tlb_gather(tlb);
  49 }
  50
  51 static inline void
  52 arch_tlb_finish_mmu(struct mmu_gather *tlb,
  53                 unsigned long start, unsigned long end, bool force)
  54 {
  55         if (tlb->fullmm || force)
  56                 flush_tlb_mm(tlb->mm);
  57
  58         /* keep the page table cache within bounds */
  59         check_pgt_cache();
  60 }
  61
  62 static inline void
  63 tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long address)
  64 {
  65         if (tlb->start > address)
  66                 tlb->start = address;
  67         if (tlb->end < address + PAGE_SIZE)
  68                 tlb->end = address + PAGE_SIZE;
  69 }
  70
  71 #define tlb_remove_huge_tlb_entry(h, tlb, ptep, address)        \
  72         tlb_remove_tlb_entry(tlb, ptep, address)
  73
  74 /*
  75  * In the case of tlb vma handling, we can optimise these away in the
  76  * case where we're doing a full MM flush.  When we're doing a munmap,
  77  * the vmas are adjusted to only cover the region to be torn down.
  78  */
  79 static inline void
  80 tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
  81 {
  82         if (!tlb->fullmm)
  83                 flush_cache_range(vma, vma->vm_start, vma->vm_end);
  84 }
  85
  86 static inline void
  87 tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
  88 {
  89         if (!tlb->fullmm && tlb->end) {
  90                 flush_tlb_range(vma, tlb->start, tlb->end);
  91                 init_tlb_gather(tlb);
  92         }
  93 }
  94
  95 static inline void tlb_flush_mmu_tlbonly(struct mmu_gather *tlb)
  96 {
  97 }
  98
  99 static inline void tlb_flush_mmu_free(struct mmu_gather *tlb)
 100 {
 101 }
 102
 103 static inline void tlb_flush_mmu(struct mmu_gather *tlb)
 104 {
 105 }
 106
 107 static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
 108 {
 109         free_page_and_swap_cache(page);
 110         return false; /* avoid calling tlb_flush_mmu */
 111 }
 112
 113 static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
 114 {
 115         __tlb_remove_page(tlb, page);
 116 }
 117
 118 static inline bool __tlb_remove_page_size(struct mmu_gather *tlb,
 119                                           struct page *page, int page_size)
 120 {
 121         return __tlb_remove_page(tlb, page);
 122 }
 123
 124 static inline void tlb_remove_page_size(struct mmu_gather *tlb,
 125                                         struct page *page, int page_size)
 126 {
 127         return tlb_remove_page(tlb, page);
 128 }
 129
 130 #define tlb_remove_check_page_size_change tlb_remove_check_page_size_change
 131 static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb,
 132                                                      unsigned int page_size)
 133 {
 134 }
 135
 136 #define pte_free_tlb(tlb, ptep, addr)   pte_free((tlb)->mm, ptep)
 137 #define pmd_free_tlb(tlb, pmdp, addr)   pmd_free((tlb)->mm, pmdp)
 138 #define pud_free_tlb(tlb, pudp, addr)   pud_free((tlb)->mm, pudp)
 139
 140 #define tlb_migrate_finish(mm)          do { } while (0)
 141
 142 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_SUPERH64)
 143 extern void tlb_wire_entry(struct vm_area_struct *, unsigned long, pte_t);
 144 extern void tlb_unwire_entry(void);
 145 #else
 146 static inline void tlb_wire_entry(struct vm_area_struct *vma ,
 147                                   unsigned long addr, pte_t pte)
 148 {
 149         BUG();
 150 }
 151
 152 static inline void tlb_unwire_entry(void)
 153 {
 154         BUG();
 155 }
 156 #endif
 157
 158 #else /* CONFIG_MMU */
 159
 160 #define tlb_start_vma(tlb, vma)                         do { } while (0)
 161 #define tlb_end_vma(tlb, vma)                           do { } while (0)
 162 #define __tlb_remove_tlb_entry(tlb, pte, address)       do { } while (0)
 163 #define tlb_flush(tlb)                                  do { } while (0)
 164
 165 #include <asm-generic/tlb.h>
 166
 167 #endif /* CONFIG_MMU */
 168 #endif /* __ASSEMBLY__ */
 169 #endif /* __ASM_SH_TLB_H */