include/linux/context_tracking.h

   1 #ifndef _LINUX_CONTEXT_TRACKING_H
   2 #define _LINUX_CONTEXT_TRACKING_H
   3
   4 #include <linux/sched.h>
   5 #include <linux/vtime.h>
   6 #include <linux/context_tracking_state.h>
   7 #include <asm/ptrace.h>
   8
   9
  10 #ifdef CONFIG_CONTEXT_TRACKING
  11 extern void context_tracking_cpu_set(int cpu);
  12
  13 extern void context_tracking_enter(enum ctx_state state);
  14 extern void context_tracking_exit(enum ctx_state state);
  15 extern void context_tracking_user_enter(void);
  16 extern void context_tracking_user_exit(void);
  17
  18 static inline void user_enter(void)
  19 {
  20         if (context_tracking_is_enabled())
  21                 context_tracking_user_enter();
  22
  23 }
  24 static inline void user_exit(void)
  25 {
  26         if (context_tracking_is_enabled())
  27                 context_tracking_user_exit();
  28 }
  29
  30 static inline enum ctx_state exception_enter(void)
  31 {
  32         enum ctx_state prev_ctx;
  33
  34         if (!context_tracking_is_enabled())
  35                 return 0;
  36
  37         prev_ctx = this_cpu_read(context_tracking.state);
  38         if (prev_ctx != CONTEXT_KERNEL)
  39                 context_tracking_exit(prev_ctx);
  40
  41         return prev_ctx;
  42 }
  43
  44 static inline void exception_exit(enum ctx_state prev_ctx)
  45 {
  46         if (context_tracking_is_enabled()) {
  47                 if (prev_ctx != CONTEXT_KERNEL)
  48                         context_tracking_enter(prev_ctx);
  49         }
  50 }
  51
  52 #else
  53 static inline void user_enter(void) { }
  54 static inline void user_exit(void) { }
  55 static inline enum ctx_state exception_enter(void) { return 0; }
  56 static inline void exception_exit(enum ctx_state prev_ctx) { }
  57 #endif /* !CONFIG_CONTEXT_TRACKING */
  58
  59
  60 #ifdef CONFIG_CONTEXT_TRACKING_FORCE
  61 extern void context_tracking_init(void);
  62 #else
  63 static inline void context_tracking_init(void) { }
  64 #endif /* CONFIG_CONTEXT_TRACKING_FORCE */
  65
  66
  67 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
  68 static inline void guest_enter(void)
  69 {
  70         if (vtime_accounting_enabled())
  71                 vtime_guest_enter(current);
  72         else
  73                 current->flags |= PF_VCPU;
  74
  75         if (context_tracking_is_enabled())
  76                 context_tracking_enter(CONTEXT_GUEST);
  77 }
  78
  79 static inline void guest_exit(void)
  80 {
  81         if (context_tracking_is_enabled())
  82                 context_tracking_exit(CONTEXT_GUEST);
  83
  84         if (vtime_accounting_enabled())
  85                 vtime_guest_exit(current);
  86         else
  87                 current->flags &= ~PF_VCPU;
  88 }
  89
  90 #else
  91 static inline void guest_enter(void)
  92 {
  93         /*
  94          * This is running in ioctl context so its safe
  95          * to assume that it's the stime pending cputime
  96          * to flush.
  97          */
  98         vtime_account_system(current);
  99         current->flags |= PF_VCPU;
 100 }
 101
 102 static inline void guest_exit(void)
 103 {
 104         /* Flush the guest cputime we spent on the guest */
 105         vtime_account_system(current);
 106         current->flags &= ~PF_VCPU;
 107 }
 108 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */
 109
 110 #endif