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 /* Called with interrupts disabled. */
14 extern void __context_tracking_enter(enum ctx_state state
);
15 extern void __context_tracking_exit(enum ctx_state state
);
17 extern void context_tracking_enter(enum ctx_state state
);
18 extern void context_tracking_exit(enum ctx_state state
);
19 extern void context_tracking_user_enter(void);
20 extern void context_tracking_user_exit(void);
22 static inline void user_enter(void)
24 if (context_tracking_is_enabled())
25 context_tracking_enter(CONTEXT_USER
);
28 static inline void user_exit(void)
30 if (context_tracking_is_enabled())
31 context_tracking_exit(CONTEXT_USER
);
34 static inline enum ctx_state
exception_enter(void)
36 enum ctx_state prev_ctx
;
38 if (!context_tracking_is_enabled())
41 prev_ctx
= this_cpu_read(context_tracking
.state
);
42 if (prev_ctx
!= CONTEXT_KERNEL
)
43 context_tracking_exit(prev_ctx
);
48 static inline void exception_exit(enum ctx_state prev_ctx
)
50 if (context_tracking_is_enabled()) {
51 if (prev_ctx
!= CONTEXT_KERNEL
)
52 context_tracking_enter(prev_ctx
);
58 * ct_state() - return the current context tracking state if known
60 * Returns the current cpu's context tracking state if context tracking
61 * is enabled. If context tracking is disabled, returns
62 * CONTEXT_DISABLED. This should be used primarily for debugging.
64 static inline enum ctx_state
ct_state(void)
66 return context_tracking_is_enabled() ?
67 this_cpu_read(context_tracking
.state
) : CONTEXT_DISABLED
;
70 static inline void user_enter(void) { }
71 static inline void user_exit(void) { }
72 static inline enum ctx_state
exception_enter(void) { return 0; }
73 static inline void exception_exit(enum ctx_state prev_ctx
) { }
74 static inline enum ctx_state
ct_state(void) { return CONTEXT_DISABLED
; }
75 #endif /* !CONFIG_CONTEXT_TRACKING */
77 #define CT_WARN_ON(cond) WARN_ON(context_tracking_is_enabled() && (cond))
79 #ifdef CONFIG_CONTEXT_TRACKING_FORCE
80 extern void context_tracking_init(void);
82 static inline void context_tracking_init(void) { }
83 #endif /* CONFIG_CONTEXT_TRACKING_FORCE */
86 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
87 static inline void guest_enter(void)
89 if (vtime_accounting_cpu_enabled())
90 vtime_guest_enter(current
);
92 current
->flags
|= PF_VCPU
;
94 if (context_tracking_is_enabled())
95 __context_tracking_enter(CONTEXT_GUEST
);
98 static inline void guest_exit(void)
100 if (context_tracking_is_enabled())
101 __context_tracking_exit(CONTEXT_GUEST
);
103 if (vtime_accounting_cpu_enabled())
104 vtime_guest_exit(current
);
106 current
->flags
&= ~PF_VCPU
;
110 static inline void guest_enter(void)
113 * This is running in ioctl context so its safe
114 * to assume that it's the stime pending cputime
117 vtime_account_system(current
);
118 current
->flags
|= PF_VCPU
;
121 static inline void guest_exit(void)
123 /* Flush the guest cputime we spent on the guest */
124 vtime_account_system(current
);
125 current
->flags
&= ~PF_VCPU
;
127 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */
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