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_irq_disabled(void)
  24 {
  25         unsigned long cr4;
  26
  27         cr4 = native_read_cr4();
  28         /* clear PGE */
  29         native_write_cr4(cr4 & ~X86_CR4_PGE);
  30         /* write old PGE again and flush TLBs */
  31         native_write_cr4(cr4);
  32 }
  33
  34 static inline void __native_flush_tlb_global(void)
  35 {
  36         unsigned long flags;
  37
  38         /*
  39          * Read-modify-write to CR4 - protect it from preemption and
  40          * from interrupts. (Use the raw variant because this code can
  41          * be called from deep inside debugging code.)
  42          */
  43         raw_local_irq_save(flags);
  44
  45         __native_flush_tlb_global_irq_disabled();
  46
  47         raw_local_irq_restore(flags);
  48 }
  49
  50 static inline void __native_flush_tlb_single(unsigned long addr)
  51 {
  52         asm volatile("invlpg (%0)" ::"r" (addr) : "memory");
  53 }
  54
  55 static inline void __flush_tlb_all(void)
  56 {
  57         if (cpu_has_pge)
  58                 __flush_tlb_global();
  59         else
  60                 __flush_tlb();
  61 }
  62
  63 static inline void __flush_tlb_one(unsigned long addr)
  64 {
  65         count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ONE);
  66         __flush_tlb_single(addr);
  67 }
  68
  69 #define TLB_FLUSH_ALL   -1UL
  70
  71 /*
  72  * TLB flushing:
  73  *
  74  *  - flush_tlb() flushes the current mm struct TLBs
  75  *  - flush_tlb_all() flushes all processes TLBs
  76  *  - flush_tlb_mm(mm) flushes the specified mm context TLB's
  77  *  - flush_tlb_page(vma, vmaddr) flushes one page
  78  *  - flush_tlb_range(vma, start, end) flushes a range of pages
  79  *  - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
  80  *  - flush_tlb_others(cpumask, mm, start, end) flushes TLBs on other cpus
  81  *
  82  * ..but the i386 has somewhat limited tlb flushing capabilities,
  83  * and page-granular flushes are available only on i486 and up.
  84  */
  85
  86 #ifndef CONFIG_SMP
  87
  88 /* "_up" is for UniProcessor.
  89  *
  90  * This is a helper for other header functions.  *Not* intended to be called
  91  * directly.  All global TLB flushes need to either call this, or to bump the
  92  * vm statistics themselves.
  93  */
  94 static inline void __flush_tlb_up(void)
  95 {
  96         count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
  97         __flush_tlb();
  98 }
  99
 100 static inline void flush_tlb_all(void)
 101 {
 102         count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
 103         __flush_tlb_all();
 104 }
 105
 106 static inline void flush_tlb(void)
 107 {
 108         __flush_tlb_up();
 109 }
 110
 111 static inline void local_flush_tlb(void)
 112 {
 113         __flush_tlb_up();
 114 }
 115
 116 static inline void flush_tlb_mm(struct mm_struct *mm)
 117 {
 118         if (mm == current->active_mm)
 119                 __flush_tlb_up();
 120 }
 121
 122 static inline void flush_tlb_page(struct vm_area_struct *vma,
 123                                   unsigned long addr)
 124 {
 125         if (vma->vm_mm == current->active_mm)
 126                 __flush_tlb_one(addr);
 127 }
 128
 129 static inline void flush_tlb_range(struct vm_area_struct *vma,
 130                                    unsigned long start, unsigned long end)
 131 {
 132         if (vma->vm_mm == current->active_mm)
 133                 __flush_tlb_up();
 134 }
 135
 136 static inline void flush_tlb_mm_range(struct mm_struct *mm,
 137            unsigned long start, unsigned long end, unsigned long vmflag)
 138 {
 139         if (mm == current->active_mm)
 140                 __flush_tlb_up();
 141 }
 142
 143 static inline void native_flush_tlb_others(const struct cpumask *cpumask,
 144                                            struct mm_struct *mm,
 145                                            unsigned long start,
 146                                            unsigned long end)
 147 {
 148 }
 149
 150 static inline void reset_lazy_tlbstate(void)
 151 {
 152 }
 153
 154 static inline void flush_tlb_kernel_range(unsigned long start,
 155                                           unsigned long end)
 156 {
 157         flush_tlb_all();
 158 }
 159
 160 #else  /* SMP */
 161
 162 #include <asm/smp.h>
 163
 164 #define local_flush_tlb() __flush_tlb()
 165
 166 #define flush_tlb_mm(mm)        flush_tlb_mm_range(mm, 0UL, TLB_FLUSH_ALL, 0UL)
 167
 168 #define flush_tlb_range(vma, start, end)        \
 169                 flush_tlb_mm_range(vma->vm_mm, start, end, vma->vm_flags)
 170
 171 extern void flush_tlb_all(void);
 172 extern void flush_tlb_current_task(void);
 173 extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
 174 extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
 175                                 unsigned long end, unsigned long vmflag);
 176 extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
 177
 178 #define flush_tlb()     flush_tlb_current_task()
 179
 180 void native_flush_tlb_others(const struct cpumask *cpumask,
 181                                 struct mm_struct *mm,
 182                                 unsigned long start, unsigned long end);
 183
 184 #define TLBSTATE_OK     1
 185 #define TLBSTATE_LAZY   2
 186
 187 struct tlb_state {
 188         struct mm_struct *active_mm;
 189         int state;
 190 };
 191 DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate);
 192
 193 static inline void reset_lazy_tlbstate(void)
 194 {
 195         this_cpu_write(cpu_tlbstate.state, 0);
 196         this_cpu_write(cpu_tlbstate.active_mm, &init_mm);
 197 }
 198
 199 #endif  /* SMP */
 200
 201 #ifndef CONFIG_PARAVIRT
 202 #define flush_tlb_others(mask, mm, start, end)  \
 203         native_flush_tlb_others(mask, mm, start, end)
 204 #endif
 205
 206 #endif /* _ASM_X86_TLBFLUSH_H */