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, va) 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  * x86-64 can only flush individual pages or full VMs. For a range flush
  82  * we always do the full VM. Might be worth trying if for a small
  83  * range a few INVLPGs in a row are a win.
  84  */
  85
  86 #ifndef CONFIG_SMP
  87
  88 #define flush_tlb() __flush_tlb()
  89 #define flush_tlb_all() __flush_tlb_all()
  90 #define local_flush_tlb() __flush_tlb()
  91
  92 static inline void flush_tlb_mm(struct mm_struct *mm)
  93 {
  94         if (mm == current->active_mm)
  95                 __flush_tlb();
  96 }
  97
  98 static inline void flush_tlb_page(struct vm_area_struct *vma,
  99                                   unsigned long addr)
 100 {
 101         if (vma->vm_mm == current->active_mm)
 102                 __flush_tlb_one(addr);
 103 }
 104
 105 static inline void flush_tlb_range(struct vm_area_struct *vma,
 106                                    unsigned long start, unsigned long end)
 107 {
 108         if (vma->vm_mm == current->active_mm)
 109                 __flush_tlb();
 110 }
 111
 112 static inline void native_flush_tlb_others(const struct cpumask *cpumask,
 113                                            struct mm_struct *mm,
 114                                            unsigned long va)
 115 {
 116 }
 117
 118 static inline void reset_lazy_tlbstate(void)
 119 {
 120 }
 121
 122 #else  /* SMP */
 123
 124 #include <asm/smp.h>
 125
 126 #define local_flush_tlb() __flush_tlb()
 127
 128 extern void flush_tlb_all(void);
 129 extern void flush_tlb_current_task(void);
 130 extern void flush_tlb_mm(struct mm_struct *);
 131 extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
 132
 133 #define flush_tlb()     flush_tlb_current_task()
 134
 135 static inline void flush_tlb_range(struct vm_area_struct *vma,
 136                                    unsigned long start, unsigned long end)
 137 {
 138         flush_tlb_mm(vma->vm_mm);
 139 }
 140
 141 void native_flush_tlb_others(const struct cpumask *cpumask,
 142                              struct mm_struct *mm, unsigned long va);
 143
 144 #define TLBSTATE_OK     1
 145 #define TLBSTATE_LAZY   2
 146
 147 struct tlb_state {
 148         struct mm_struct *active_mm;
 149         int state;
 150 };
 151 DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate);
 152
 153 static inline void reset_lazy_tlbstate(void)
 154 {
 155         this_cpu_write(cpu_tlbstate.state, 0);
 156         this_cpu_write(cpu_tlbstate.active_mm, &init_mm);
 157 }
 158
 159 #endif  /* SMP */
 160
 161 #ifndef CONFIG_PARAVIRT
 162 #define flush_tlb_others(mask, mm, va)  native_flush_tlb_others(mask, mm, va)
 163 #endif
 164
 165 static inline void flush_tlb_kernel_range(unsigned long start,
 166                                           unsigned long end)
 167 {
 168         flush_tlb_all();
 169 }
 170
 171 #endif /* _ASM_X86_TLBFLUSH_H */