include/asm-sparc64/tlb.h

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