include/asm-arm26/tlb.h

   1 #ifndef __ASMARM_TLB_H
   2 #define __ASMARM_TLB_H
   3
   4 #include <asm/pgalloc.h>
   5 #include <asm/tlbflush.h>
   6 #include <linux/vs_memory.h>
   7
   8 /*
   9  * TLB handling.  This allows us to remove pages from the page
  10  * tables, and efficiently handle the TLB issues.
  11  */
  12 struct mmu_gather {
  13         struct mm_struct        *mm;
  14         unsigned int            freed;
  15         unsigned int            fullmm;
  16
  17         unsigned int            flushes;
  18         unsigned int            avoided_flushes;
  19 };
  20
  21 extern struct mmu_gather mmu_gathers[NR_CPUS];
  22
  23 static inline struct mmu_gather *
  24 tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush)
  25 {
  26         int cpu = smp_processor_id();
  27         struct mmu_gather *tlb = &mmu_gathers[cpu];
  28
  29         tlb->mm = mm;
  30         tlb->freed = 0;
  31         tlb->fullmm = full_mm_flush;
  32
  33         return tlb;
  34 }
  35
  36 static inline void
  37 tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
  38 {
  39         struct mm_struct *mm = tlb->mm;
  40         unsigned long freed = tlb->freed;
  41         int rss = get_mm_counter(mm, rss);
  42
  43         if (rss < freed)
  44                 freed = rss;
  45         add_mm_counter(mm, rss, -freed);
  46
  47         if (freed) {
  48                 flush_tlb_mm(mm);
  49                 tlb->flushes++;
  50         } else {
  51                 tlb->avoided_flushes++;
  52         }
  53
  54         /* keep the page table cache within bounds */
  55         check_pgt_cache();
  56 }
  57
  58
  59 static inline unsigned int
  60 tlb_is_full_mm(struct mmu_gather *tlb)
  61 {
  62      return tlb->fullmm;
  63 }
  64
  65 #define tlb_remove_tlb_entry(tlb,ptep,address)  do { } while (0)
  66 //#define tlb_start_vma(tlb,vma)                  do { } while (0)
  67 //FIXME - ARM32 uses this now that things changed in the kernel. seems like it may be pointless on arm26, however to get things compiling...
  68 #define tlb_start_vma(tlb,vma)                                          \
  69         do {                                                            \
  70                 if (!tlb->fullmm)                                       \
  71                         flush_cache_range(vma, vma->vm_start, vma->vm_end); \
  72         } while (0)
  73 #define tlb_end_vma(tlb,vma)                    do { } while (0)
  74
  75 #define tlb_remove_page(tlb,page)       free_page_and_swap_cache(page)
  76 #define pte_free_tlb(tlb,ptep)          pte_free(ptep)
  77 #define pmd_free_tlb(tlb,pmdp)          pmd_free(pmdp)
  78
  79 #endif