kernel/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 struct tlb_state {
  19 #ifdef CONFIG_SMP
  20         struct mm_struct *active_mm;
  21         int state;
  22 #endif
  23
  24         /*
  25          * Access to this CR4 shadow and to H/W CR4 is protected by
  26          * disabling interrupts when modifying either one.
  27          */
  28         unsigned long cr4;
  29 };
  30 DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate);
  31
  32 /* Initialize cr4 shadow for this CPU. */
  33 static inline void cr4_init_shadow(void)
  34 {
  35         this_cpu_write(cpu_tlbstate.cr4, __read_cr4());
  36 }
  37
  38 /* Set in this cpu's CR4. */
  39 static inline void cr4_set_bits(unsigned long mask)
  40 {
  41         unsigned long cr4;
  42
  43         cr4 = this_cpu_read(cpu_tlbstate.cr4);
  44         if ((cr4 | mask) != cr4) {
  45                 cr4 |= mask;
  46                 this_cpu_write(cpu_tlbstate.cr4, cr4);
  47                 __write_cr4(cr4);
  48         }
  49 }
  50
  51 /* Clear in this cpu's CR4. */
  52 static inline void cr4_clear_bits(unsigned long mask)
  53 {
  54         unsigned long cr4;
  55
  56         cr4 = this_cpu_read(cpu_tlbstate.cr4);
  57         if ((cr4 & ~mask) != cr4) {
  58                 cr4 &= ~mask;
  59                 this_cpu_write(cpu_tlbstate.cr4, cr4);
  60                 __write_cr4(cr4);
  61         }
  62 }
  63
  64 /* Read the CR4 shadow. */
  65 static inline unsigned long cr4_read_shadow(void)
  66 {
  67         return this_cpu_read(cpu_tlbstate.cr4);
  68 }
  69
  70 /*
  71  * Save some of cr4 feature set we're using (e.g.  Pentium 4MB
  72  * enable and PPro Global page enable), so that any CPU's that boot
  73  * up after us can get the correct flags.  This should only be used
  74  * during boot on the boot cpu.
  75  */
  76 extern unsigned long mmu_cr4_features;
  77 extern u32 *trampoline_cr4_features;
  78
  79 static inline void cr4_set_bits_and_update_boot(unsigned long mask)
  80 {
  81         mmu_cr4_features |= mask;
  82         if (trampoline_cr4_features)
  83                 *trampoline_cr4_features = mmu_cr4_features;
  84         cr4_set_bits(mask);
  85 }
  86
  87 static inline void __native_flush_tlb(void)
  88 {
  89         native_write_cr3(native_read_cr3());
  90 }
  91
  92 static inline void __native_flush_tlb_global_irq_disabled(void)
  93 {
  94         unsigned long cr4;
  95
  96         cr4 = this_cpu_read(cpu_tlbstate.cr4);
  97         /* clear PGE */
  98         native_write_cr4(cr4 & ~X86_CR4_PGE);
  99         /* write old PGE again and flush TLBs */
 100         native_write_cr4(cr4);
 101 }
 102
 103 static inline void __native_flush_tlb_global(void)
 104 {
 105         unsigned long flags;
 106
 107         /*
 108          * Read-modify-write to CR4 - protect it from preemption and
 109          * from interrupts. (Use the raw variant because this code can
 110          * be called from deep inside debugging code.)
 111          */
 112         raw_local_irq_save(flags);
 113
 114         __native_flush_tlb_global_irq_disabled();
 115
 116         raw_local_irq_restore(flags);
 117 }
 118
 119 static inline void __native_flush_tlb_single(unsigned long addr)
 120 {
 121         asm volatile("invlpg (%0)" ::"r" (addr) : "memory");
 122 }
 123
 124 static inline void __flush_tlb_all(void)
 125 {
 126         if (cpu_has_pge)
 127                 __flush_tlb_global();
 128         else
 129                 __flush_tlb();
 130 }
 131
 132 static inline void __flush_tlb_one(unsigned long addr)
 133 {
 134         count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ONE);
 135         __flush_tlb_single(addr);
 136 }
 137
 138 #define TLB_FLUSH_ALL   -1UL
 139
 140 /*
 141  * TLB flushing:
 142  *
 143  *  - flush_tlb() flushes the current mm struct TLBs
 144  *  - flush_tlb_all() flushes all processes TLBs
 145  *  - flush_tlb_mm(mm) flushes the specified mm context TLB's
 146  *  - flush_tlb_page(vma, vmaddr) flushes one page
 147  *  - flush_tlb_range(vma, start, end) flushes a range of pages
 148  *  - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
 149  *  - flush_tlb_others(cpumask, mm, start, end) flushes TLBs on other cpus
 150  *
 151  * ..but the i386 has somewhat limited tlb flushing capabilities,
 152  * and page-granular flushes are available only on i486 and up.
 153  */
 154
 155 #ifndef CONFIG_SMP
 156
 157 /* "_up" is for UniProcessor.
 158  *
 159  * This is a helper for other header functions.  *Not* intended to be called
 160  * directly.  All global TLB flushes need to either call this, or to bump the
 161  * vm statistics themselves.
 162  */
 163 static inline void __flush_tlb_up(void)
 164 {
 165         count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
 166         __flush_tlb();
 167 }
 168
 169 static inline void flush_tlb_all(void)
 170 {
 171         count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
 172         __flush_tlb_all();
 173 }
 174
 175 static inline void flush_tlb(void)
 176 {
 177         __flush_tlb_up();
 178 }
 179
 180 static inline void local_flush_tlb(void)
 181 {
 182         __flush_tlb_up();
 183 }
 184
 185 static inline void flush_tlb_mm(struct mm_struct *mm)
 186 {
 187         if (mm == current->active_mm)
 188                 __flush_tlb_up();
 189 }
 190
 191 static inline void flush_tlb_page(struct vm_area_struct *vma,
 192                                   unsigned long addr)
 193 {
 194         if (vma->vm_mm == current->active_mm)
 195                 __flush_tlb_one(addr);
 196 }
 197
 198 static inline void flush_tlb_range(struct vm_area_struct *vma,
 199                                    unsigned long start, unsigned long end)
 200 {
 201         if (vma->vm_mm == current->active_mm)
 202                 __flush_tlb_up();
 203 }
 204
 205 static inline void flush_tlb_mm_range(struct mm_struct *mm,
 206            unsigned long start, unsigned long end, unsigned long vmflag)
 207 {
 208         if (mm == current->active_mm)
 209                 __flush_tlb_up();
 210 }
 211
 212 static inline void native_flush_tlb_others(const struct cpumask *cpumask,
 213                                            struct mm_struct *mm,
 214                                            unsigned long start,
 215                                            unsigned long end)
 216 {
 217 }
 218
 219 static inline void reset_lazy_tlbstate(void)
 220 {
 221 }
 222
 223 static inline void flush_tlb_kernel_range(unsigned long start,
 224                                           unsigned long end)
 225 {
 226         flush_tlb_all();
 227 }
 228
 229 #else  /* SMP */
 230
 231 #include <asm/smp.h>
 232
 233 #define local_flush_tlb() __flush_tlb()
 234
 235 #define flush_tlb_mm(mm)        flush_tlb_mm_range(mm, 0UL, TLB_FLUSH_ALL, 0UL)
 236
 237 #define flush_tlb_range(vma, start, end)        \
 238                 flush_tlb_mm_range(vma->vm_mm, start, end, vma->vm_flags)
 239
 240 extern void flush_tlb_all(void);
 241 extern void flush_tlb_current_task(void);
 242 extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
 243 extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
 244                                 unsigned long end, unsigned long vmflag);
 245 extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
 246
 247 #define flush_tlb()     flush_tlb_current_task()
 248
 249 void native_flush_tlb_others(const struct cpumask *cpumask,
 250                                 struct mm_struct *mm,
 251                                 unsigned long start, unsigned long end);
 252
 253 #define TLBSTATE_OK     1
 254 #define TLBSTATE_LAZY   2
 255
 256 static inline void reset_lazy_tlbstate(void)
 257 {
 258         this_cpu_write(cpu_tlbstate.state, 0);
 259         this_cpu_write(cpu_tlbstate.active_mm, &init_mm);
 260 }
 261
 262 #endif  /* SMP */
 263
 264 #ifndef CONFIG_PARAVIRT
 265 #define flush_tlb_others(mask, mm, start, end)  \
 266         native_flush_tlb_others(mask, mm, start, end)
 267 #endif
 268
 269 #endif /* _ASM_X86_TLBFLUSH_H */