arch/x86/include/asm/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/special_insns.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         native_write_cr3(native_read_cr3());
  21 }
  22
  23 static inline void __native_flush_tlb_global(void)
  24 {
  25         unsigned long flags;
  26         unsigned long cr4;
  27
  28         /*
  29          * Read-modify-write to CR4 - protect it from preemption and
  30          * from interrupts. (Use the raw variant because this code can
  31          * be called from deep inside debugging code.)
  32          */
  33         raw_local_irq_save(flags);
  34
  35         cr4 = native_read_cr4();
  36         /* clear PGE */
  37         native_write_cr4(cr4 & ~X86_CR4_PGE);
  38         /* write old PGE again and flush TLBs */
  39         native_write_cr4(cr4);
  40
  41         raw_local_irq_restore(flags);
  42 }
  43
  44 static inline void __native_flush_tlb_single(unsigned long addr)
  45 {
  46         asm volatile("invlpg (%0)" ::"r" (addr) : "memory");
  47 }
  48
  49 static inline void __flush_tlb_all(void)
  50 {
  51         if (cpu_has_pge)
  52                 __flush_tlb_global();
  53         else
  54                 __flush_tlb();
  55 }
  56
  57 static inline void __flush_tlb_one(unsigned long addr)
  58 {
  59         if (cpu_has_invlpg)
  60                 __flush_tlb_single(addr);
  61         else
  62                 __flush_tlb();
  63 }
  64
  65 #define TLB_FLUSH_ALL   -1UL
  66
  67 /*
  68  * TLB flushing:
  69  *
  70  *  - flush_tlb() flushes the current mm struct TLBs
  71  *  - flush_tlb_all() flushes all processes TLBs
  72  *  - flush_tlb_mm(mm) flushes the specified mm context TLB's
  73  *  - flush_tlb_page(vma, vmaddr) flushes one page
  74  *  - flush_tlb_range(vma, start, end) flushes a range of pages
  75  *  - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
  76  *  - flush_tlb_others(cpumask, mm, start, end) flushes TLBs on other cpus
  77  *
  78  * ..but the i386 has somewhat limited tlb flushing capabilities,
  79  * and page-granular flushes are available only on i486 and up.
  80  */
  81
  82 #ifndef CONFIG_SMP
  83
  84 #define flush_tlb() __flush_tlb()
  85 #define flush_tlb_all() __flush_tlb_all()
  86 #define local_flush_tlb() __flush_tlb()
  87
  88 static inline void flush_tlb_mm(struct mm_struct *mm)
  89 {
  90         if (mm == current->active_mm)
  91                 __flush_tlb();
  92 }
  93
  94 static inline void flush_tlb_page(struct vm_area_struct *vma,
  95                                   unsigned long addr)
  96 {
  97         if (vma->vm_mm == current->active_mm)
  98                 __flush_tlb_one(addr);
  99 }
 100
 101 static inline void flush_tlb_range(struct vm_area_struct *vma,
 102                                    unsigned long start, unsigned long end)
 103 {
 104         if (vma->vm_mm == current->active_mm)
 105                 __flush_tlb();
 106 }
 107
 108 static inline void flush_tlb_mm_range(struct mm_struct *mm,
 109            unsigned long start, unsigned long end, unsigned long vmflag)
 110 {
 111         if (mm == current->active_mm)
 112                 __flush_tlb();
 113 }
 114
 115 static inline void native_flush_tlb_others(const struct cpumask *cpumask,
 116                                            struct mm_struct *mm,
 117                                            unsigned long start,
 118                                            unsigned long end)
 119 {
 120 }
 121
 122 static inline void reset_lazy_tlbstate(void)
 123 {
 124 }
 125
 126 static inline void flush_tlb_kernel_range(unsigned long start,
 127                                           unsigned long end)
 128 {
 129         flush_tlb_all();
 130 }
 131
 132 #else  /* SMP */
 133
 134 #include <asm/smp.h>
 135
 136 #define local_flush_tlb() __flush_tlb()
 137
 138 #define flush_tlb_mm(mm)        flush_tlb_mm_range(mm, 0UL, TLB_FLUSH_ALL, 0UL)
 139
 140 #define flush_tlb_range(vma, start, end)        \
 141                 flush_tlb_mm_range(vma->vm_mm, start, end, vma->vm_flags)
 142
 143 extern void flush_tlb_all(void);
 144 extern void flush_tlb_current_task(void);
 145 extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
 146 extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
 147                                 unsigned long end, unsigned long vmflag);
 148 extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
 149
 150 #define flush_tlb()     flush_tlb_current_task()
 151
 152 void native_flush_tlb_others(const struct cpumask *cpumask,
 153                                 struct mm_struct *mm,
 154                                 unsigned long start, unsigned long end);
 155
 156 #define TLBSTATE_OK     1
 157 #define TLBSTATE_LAZY   2
 158
 159 struct tlb_state {
 160         struct mm_struct *active_mm;
 161         int state;
 162 };
 163 DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate);
 164
 165 static inline void reset_lazy_tlbstate(void)
 166 {
 167         this_cpu_write(cpu_tlbstate.state, 0);
 168         this_cpu_write(cpu_tlbstate.active_mm, &init_mm);
 169 }
 170
 171 #endif  /* SMP */
 172
 173 #ifndef CONFIG_PARAVIRT
 174 #define flush_tlb_others(mask, mm, start, end)  \
 175         native_flush_tlb_others(mask, mm, start, end)
 176 #endif
 177
 178 #endif /* _ASM_X86_TLBFLUSH_H */