include/asm-x86/tlbflush.h

   1 #ifndef _ASM_X86_TLBFLUSH_H
   2 #define _ASM_X86_TLBFLUSH_H
   3
   4 #include <linux/mm.h>
   5 #include <linux/sched.h>
   6
   7 #include <asm/processor.h>
   8 #include <asm/system.h>
   9
  10 #ifdef CONFIG_PARAVIRT
  11 #include <asm/paravirt.h>
  12 #else
  13 #define __flush_tlb() __native_flush_tlb()
  14 #define __flush_tlb_global() __native_flush_tlb_global()
  15 #define __flush_tlb_single(addr) __native_flush_tlb_single(addr)
  16 #endif
  17
  18 static inline void __native_flush_tlb(void)
  19 {
  20         write_cr3(read_cr3());
  21 }
  22
  23 static inline void __native_flush_tlb_global(void)
  24 {
  25         unsigned long cr4 = read_cr4();
  26
  27         /* clear PGE */
  28         write_cr4(cr4 & ~X86_CR4_PGE);
  29         /* write old PGE again and flush TLBs */
  30         write_cr4(cr4);
  31 }
  32
  33 static inline void __native_flush_tlb_single(unsigned long addr)
  34 {
  35         __asm__ __volatile__("invlpg (%0)" ::"r" (addr) : "memory");
  36 }
  37
  38 static inline void __flush_tlb_all(void)
  39 {
  40         if (cpu_has_pge)
  41                 __flush_tlb_global();
  42         else
  43                 __flush_tlb();
  44 }
  45
  46 static inline void __flush_tlb_one(unsigned long addr)
  47 {
  48         if (cpu_has_invlpg)
  49                 __flush_tlb_single(addr);
  50         else
  51                 __flush_tlb();
  52 }
  53
  54 #ifdef CONFIG_X86_32
  55 # define TLB_FLUSH_ALL  0xffffffff
  56 #else
  57 # define TLB_FLUSH_ALL  -1ULL
  58 #endif
  59
  60 /*
  61  * TLB flushing:
  62  *
  63  *  - flush_tlb() flushes the current mm struct TLBs
  64  *  - flush_tlb_all() flushes all processes TLBs
  65  *  - flush_tlb_mm(mm) flushes the specified mm context TLB's
  66  *  - flush_tlb_page(vma, vmaddr) flushes one page
  67  *  - flush_tlb_range(vma, start, end) flushes a range of pages
  68  *  - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
  69  *  - flush_tlb_others(cpumask, mm, va) flushes TLBs on other cpus
  70  *
  71  * ..but the i386 has somewhat limited tlb flushing capabilities,
  72  * and page-granular flushes are available only on i486 and up.
  73  *
  74  * x86-64 can only flush individual pages or full VMs. For a range flush
  75  * we always do the full VM. Might be worth trying if for a small
  76  * range a few INVLPGs in a row are a win.
  77  */
  78
  79 #ifndef CONFIG_SMP
  80
  81 #define flush_tlb() __flush_tlb()
  82 #define flush_tlb_all() __flush_tlb_all()
  83 #define local_flush_tlb() __flush_tlb()
  84
  85 static inline void flush_tlb_mm(struct mm_struct *mm)
  86 {
  87         if (mm == current->active_mm)
  88                 __flush_tlb();
  89 }
  90
  91 static inline void flush_tlb_page(struct vm_area_struct *vma,
  92                                   unsigned long addr)
  93 {
  94         if (vma->vm_mm == current->active_mm)
  95                 __flush_tlb_one(addr);
  96 }
  97
  98 static inline void flush_tlb_range(struct vm_area_struct *vma,
  99                                    unsigned long start, unsigned long end)
 100 {
 101         if (vma->vm_mm == current->active_mm)
 102                 __flush_tlb();
 103 }
 104
 105 static inline void native_flush_tlb_others(const cpumask_t *cpumask,
 106                                            struct mm_struct *mm,
 107                                            unsigned long va)
 108 {
 109 }
 110
 111 #else  /* SMP */
 112
 113 #include <asm/smp.h>
 114
 115 #define local_flush_tlb() __flush_tlb()
 116
 117 extern void flush_tlb_all(void);
 118 extern void flush_tlb_current_task(void);
 119 extern void flush_tlb_mm(struct mm_struct *);
 120 extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
 121
 122 #define flush_tlb()     flush_tlb_current_task()
 123
 124 static inline void flush_tlb_range(struct vm_area_struct *vma,
 125                                    unsigned long start, unsigned long end)
 126 {
 127         flush_tlb_mm(vma->vm_mm);
 128 }
 129
 130 void native_flush_tlb_others(const cpumask_t *cpumask, struct mm_struct *mm,
 131                              unsigned long va);
 132
 133 #define TLBSTATE_OK     1
 134 #define TLBSTATE_LAZY   2
 135
 136 #ifdef CONFIG_X86_32
 137 struct tlb_state
 138 {
 139         struct mm_struct *active_mm;
 140         int state;
 141         char __cacheline_padding[L1_CACHE_BYTES-8];
 142 };
 143 DECLARE_PER_CPU(struct tlb_state, cpu_tlbstate);
 144 #endif
 145
 146 #endif  /* SMP */
 147
 148 #ifndef CONFIG_PARAVIRT
 149 #define flush_tlb_others(mask, mm, va)  native_flush_tlb_others(&mask, mm, va)
 150 #endif
 151
 152 static inline void flush_tlb_kernel_range(unsigned long start,
 153                                           unsigned long end)
 154 {
 155         flush_tlb_all();
 156 }
 157
 158 #endif /* _ASM_X86_TLBFLUSH_H */