1 #ifndef _LINUX_CONTEXT_TRACKING_H
2 #define _LINUX_CONTEXT_TRACKING_H
4 #include <linux/sched.h>
5 #include <linux/vtime.h>
6 #include <linux/context_tracking_state.h>
7 #include <asm/ptrace.h>
10 #ifdef CONFIG_CONTEXT_TRACKING
11 extern void context_tracking_cpu_set(int cpu
);
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);
18 static inline void user_enter(void)
20 if (context_tracking_is_enabled())
21 context_tracking_user_enter();
24 static inline void user_exit(void)
26 if (context_tracking_is_enabled())
27 context_tracking_user_exit();
30 static inline enum ctx_state
exception_enter(void)
32 enum ctx_state prev_ctx
;
34 if (!context_tracking_is_enabled())
37 prev_ctx
= this_cpu_read(context_tracking
.state
);
38 if (prev_ctx
!= CONTEXT_KERNEL
)
39 context_tracking_exit(prev_ctx
);
44 static inline void exception_exit(enum ctx_state prev_ctx
)
46 if (context_tracking_is_enabled()) {
47 if (prev_ctx
!= CONTEXT_KERNEL
)
48 context_tracking_enter(prev_ctx
);
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 */
60 #ifdef CONFIG_CONTEXT_TRACKING_FORCE
61 extern void context_tracking_init(void);
63 static inline void context_tracking_init(void) { }
64 #endif /* CONFIG_CONTEXT_TRACKING_FORCE */
67 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
68 static inline void guest_enter(void)
70 if (vtime_accounting_enabled())
71 vtime_guest_enter(current
);
73 current
->flags
|= PF_VCPU
;
75 if (context_tracking_is_enabled())
76 context_tracking_enter(CONTEXT_GUEST
);
79 static inline void guest_exit(void)
81 if (context_tracking_is_enabled())
82 context_tracking_exit(CONTEXT_GUEST
);
84 if (vtime_accounting_enabled())
85 vtime_guest_exit(current
);
87 current
->flags
&= ~PF_VCPU
;
91 static inline void guest_enter(void)
94 * This is running in ioctl context so its safe
95 * to assume that it's the stime pending cputime
98 vtime_account_system(current
);
99 current
->flags
|= PF_VCPU
;
102 static inline void guest_exit(void)
104 /* Flush the guest cputime we spent on the guest */
105 vtime_account_system(current
);
106 current
->flags
&= ~PF_VCPU
;
108 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */
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