include/asm-sparc64/tlb.h

   1 #ifndef _SPARC64_TLB_H
   2 #define _SPARC64_TLB_H
   3
   4 #include <linux/config.h>
   5 #include <linux/swap.h>
   6 #include <asm/pgalloc.h>
   7 #include <asm/tlbflush.h>
   8 #include <asm/mmu_context.h>
   9
  10 #define TLB_BATCH_NR    192
  11
  12 /*
  13  * For UP we don't need to worry about TLB flush
  14  * and page free order so much..
  15  */
  16 #ifdef CONFIG_SMP
  17   #define FREE_PTE_NR   506
  18   #define tlb_fast_mode(bp) ((bp)->pages_nr == ~0U)
  19 #else
  20   #define FREE_PTE_NR   1
  21   #define tlb_fast_mode(bp) 1
  22 #endif
  23
  24 struct mmu_gather {
  25         struct mm_struct *mm;
  26         unsigned int pages_nr;
  27         unsigned int need_flush;
  28         unsigned int tlb_frozen;
  29         unsigned int tlb_nr;
  30         unsigned long freed;
  31         unsigned long vaddrs[TLB_BATCH_NR];
  32         struct page *pages[FREE_PTE_NR];
  33 };
  34
  35 DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);
  36
  37 #ifdef CONFIG_SMP
  38 extern void smp_flush_tlb_pending(struct mm_struct *,
  39                                   unsigned long, unsigned long *);
  40 #endif
  41
  42 extern void __flush_tlb_pending(unsigned long, unsigned long, unsigned long *);
  43 extern void flush_tlb_pending(void);
  44
  45 static inline struct mmu_gather *tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush)
  46 {
  47         struct mmu_gather *mp = &__get_cpu_var(mmu_gathers);
  48
  49         BUG_ON(mp->tlb_nr);
  50
  51         mp->mm = mm;
  52         mp->pages_nr = num_online_cpus() > 1 ? 0U : ~0U;
  53         mp->tlb_frozen = full_mm_flush;
  54         mp->freed = 0;
  55
  56         return mp;
  57 }
  58
  59
  60 static inline void tlb_flush_mmu(struct mmu_gather *mp)
  61 {
  62         if (mp->need_flush) {
  63                 mp->need_flush = 0;
  64                 if (!tlb_fast_mode(mp)) {
  65                         free_pages_and_swap_cache(mp->pages, mp->pages_nr);
  66                         mp->pages_nr = 0;
  67                 }
  68         }
  69
  70 }
  71
  72 #ifdef CONFIG_SMP
  73 extern void smp_flush_tlb_mm(struct mm_struct *mm);
  74 #define do_flush_tlb_mm(mm) smp_flush_tlb_mm(mm)
  75 #else
  76 #define do_flush_tlb_mm(mm) __flush_tlb_mm(CTX_HWBITS(mm->context), SECONDARY_CONTEXT)
  77 #endif
  78
  79 static inline void tlb_finish_mmu(struct mmu_gather *mp, unsigned long start, unsigned long end)
  80 {
  81         unsigned long freed = mp->freed;
  82         struct mm_struct *mm = mp->mm;
  83         unsigned long rss = get_mm_counter(mm, rss);
  84
  85         if (rss < freed)
  86                 freed = rss;
  87         add_mm_counter(mm, rss, -freed);
  88
  89         tlb_flush_mmu(mp);
  90
  91         if (mp->tlb_frozen) {
  92                 if (CTX_VALID(mm->context))
  93                         do_flush_tlb_mm(mm);
  94                 mp->tlb_frozen = 0;
  95         } else
  96                 flush_tlb_pending();
  97
  98         /* keep the page table cache within bounds */
  99         check_pgt_cache();
 100 }
 101
 102 static inline unsigned int tlb_is_full_mm(struct mmu_gather *mp)
 103 {
 104         return mp->tlb_frozen;
 105 }
 106
 107 static inline void tlb_remove_page(struct mmu_gather *mp, struct page *page)
 108 {
 109         mp->need_flush = 1;
 110         if (tlb_fast_mode(mp)) {
 111                 free_page_and_swap_cache(page);
 112                 return;
 113         }
 114         mp->pages[mp->pages_nr++] = page;
 115         if (mp->pages_nr >= FREE_PTE_NR)
 116                 tlb_flush_mmu(mp);
 117 }
 118
 119 #define tlb_remove_tlb_entry(mp,ptep,addr) do { } while (0)
 120 #define pte_free_tlb(mp,ptepage) pte_free(ptepage)
 121 #define pmd_free_tlb(mp,pmdp) pmd_free(pmdp)
 122 #define pud_free_tlb(tlb,pudp) __pud_free_tlb(tlb,pudp)
 123
 124 #define tlb_migrate_finish(mm)  do { } while (0)
 125 #define tlb_start_vma(tlb, vma) do { } while (0)
 126 #define tlb_end_vma(tlb, vma)   do { } while (0)
 127
 128 #endif /* _SPARC64_TLB_H */