arch/sh/include/asm/tlb.h

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