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         /*
  21          * If current->mm == NULL then we borrow a mm which may change during a
  22          * task switch and therefore we must not be preempted while we write CR3
  23          * back:
  24          */
  25         preempt_disable();
  26         native_write_cr3(native_read_cr3());
  27         preempt_enable();
  28 }
  29
  30 static inline void __native_flush_tlb_global_irq_disabled(void)
  31 {
  32         unsigned long cr4;
  33
  34         cr4 = native_read_cr4();
  35         /* clear PGE */
  36         native_write_cr4(cr4 & ~X86_CR4_PGE);
  37         /* write old PGE again and flush TLBs */
  38         native_write_cr4(cr4);
  39 }
  40
  41 static inline void __native_flush_tlb_global(void)
  42 {
  43         unsigned long flags;
  44
  45         /*
  46          * Read-modify-write to CR4 - protect it from preemption and
  47          * from interrupts. (Use the raw variant because this code can
  48          * be called from deep inside debugging code.)
  49          */
  50         raw_local_irq_save(flags);
  51
  52         __native_flush_tlb_global_irq_disabled();
  53
  54         raw_local_irq_restore(flags);
  55 }
  56
  57 static inline void __native_flush_tlb_single(unsigned long addr)
  58 {
  59         asm volatile("invlpg (%0)" ::"r" (addr) : "memory");
  60 }
  61
  62 static inline void __flush_tlb_all(void)
  63 {
  64         if (cpu_has_pge)
  65                 __flush_tlb_global();
  66         else
  67                 __flush_tlb();
  68 }
  69
  70 static inline void __flush_tlb_one(unsigned long addr)
  71 {
  72         count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ONE);
  73         __flush_tlb_single(addr);
  74 }
  75
  76 #define TLB_FLUSH_ALL   -1UL
  77
  78 /*
  79  * TLB flushing:
  80  *
  81  *  - flush_tlb() flushes the current mm struct TLBs
  82  *  - flush_tlb_all() flushes all processes TLBs
  83  *  - flush_tlb_mm(mm) flushes the specified mm context TLB's
  84  *  - flush_tlb_page(vma, vmaddr) flushes one page
  85  *  - flush_tlb_range(vma, start, end) flushes a range of pages
  86  *  - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
  87  *  - flush_tlb_others(cpumask, mm, start, end) flushes TLBs on other cpus
  88  *
  89  * ..but the i386 has somewhat limited tlb flushing capabilities,
  90  * and page-granular flushes are available only on i486 and up.
  91  */
  92
  93 #ifndef CONFIG_SMP
  94
  95 /* "_up" is for UniProcessor.
  96  *
  97  * This is a helper for other header functions.  *Not* intended to be called
  98  * directly.  All global TLB flushes need to either call this, or to bump the
  99  * vm statistics themselves.
 100  */
 101 static inline void __flush_tlb_up(void)
 102 {
 103         count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
 104         __flush_tlb();
 105 }
 106
 107 static inline void flush_tlb_all(void)
 108 {
 109         count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
 110         __flush_tlb_all();
 111 }
 112
 113 static inline void flush_tlb(void)
 114 {
 115         __flush_tlb_up();
 116 }
 117
 118 static inline void local_flush_tlb(void)
 119 {
 120         __flush_tlb_up();
 121 }
 122
 123 static inline void flush_tlb_mm(struct mm_struct *mm)
 124 {
 125         if (mm == current->active_mm)
 126                 __flush_tlb_up();
 127 }
 128
 129 static inline void flush_tlb_page(struct vm_area_struct *vma,
 130                                   unsigned long addr)
 131 {
 132         if (vma->vm_mm == current->active_mm)
 133                 __flush_tlb_one(addr);
 134 }
 135
 136 static inline void flush_tlb_range(struct vm_area_struct *vma,
 137                                    unsigned long start, unsigned long end)
 138 {
 139         if (vma->vm_mm == current->active_mm)
 140                 __flush_tlb_up();
 141 }
 142
 143 static inline void flush_tlb_mm_range(struct mm_struct *mm,
 144            unsigned long start, unsigned long end, unsigned long vmflag)
 145 {
 146         if (mm == current->active_mm)
 147                 __flush_tlb_up();
 148 }
 149
 150 static inline void native_flush_tlb_others(const struct cpumask *cpumask,
 151                                            struct mm_struct *mm,
 152                                            unsigned long start,
 153                                            unsigned long end)
 154 {
 155 }
 156
 157 static inline void reset_lazy_tlbstate(void)
 158 {
 159 }
 160
 161 static inline void flush_tlb_kernel_range(unsigned long start,
 162                                           unsigned long end)
 163 {
 164         flush_tlb_all();
 165 }
 166
 167 #else  /* SMP */
 168
 169 #include <asm/smp.h>
 170
 171 #define local_flush_tlb() __flush_tlb()
 172
 173 #define flush_tlb_mm(mm)        flush_tlb_mm_range(mm, 0UL, TLB_FLUSH_ALL, 0UL)
 174
 175 #define flush_tlb_range(vma, start, end)        \
 176                 flush_tlb_mm_range(vma->vm_mm, start, end, vma->vm_flags)
 177
 178 extern void flush_tlb_all(void);
 179 extern void flush_tlb_current_task(void);
 180 extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
 181 extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
 182                                 unsigned long end, unsigned long vmflag);
 183 extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
 184
 185 #define flush_tlb()     flush_tlb_current_task()
 186
 187 void native_flush_tlb_others(const struct cpumask *cpumask,
 188                                 struct mm_struct *mm,
 189                                 unsigned long start, unsigned long end);
 190
 191 #define TLBSTATE_OK     1
 192 #define TLBSTATE_LAZY   2
 193
 194 struct tlb_state {
 195         struct mm_struct *active_mm;
 196         int state;
 197 };
 198 DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate);
 199
 200 static inline void reset_lazy_tlbstate(void)
 201 {
 202         this_cpu_write(cpu_tlbstate.state, 0);
 203         this_cpu_write(cpu_tlbstate.active_mm, &init_mm);
 204 }
 205
 206 #endif  /* SMP */
 207
 208 #ifndef CONFIG_PARAVIRT
 209 #define flush_tlb_others(mask, mm, start, end)  \
 210         native_flush_tlb_others(mask, mm, start, end)
 211 #endif
 212
 213 #endif /* _ASM_X86_TLBFLUSH_H */