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);
54 * ct_state() - return the current context tracking state if known
56 * Returns the current cpu's context tracking state if context tracking
57 * is enabled. If context tracking is disabled, returns
58 * CONTEXT_DISABLED. This should be used primarily for debugging.
60 static inline enum ctx_state ct_state(void)
62 return context_tracking_is_enabled() ?
63 this_cpu_read(context_tracking.state) : CONTEXT_DISABLED;
66 static inline void user_enter(void) { }
67 static inline void user_exit(void) { }
68 static inline enum ctx_state exception_enter(void) { return 0; }
69 static inline void exception_exit(enum ctx_state prev_ctx) { }
70 static inline enum ctx_state ct_state(void) { return CONTEXT_DISABLED; }
71 #endif /* !CONFIG_CONTEXT_TRACKING */
73 #define CT_WARN_ON(cond) WARN_ON(context_tracking_is_enabled() && (cond))
75 #ifdef CONFIG_CONTEXT_TRACKING_FORCE
76 extern void context_tracking_init(void);
78 static inline void context_tracking_init(void) { }
79 #endif /* CONFIG_CONTEXT_TRACKING_FORCE */
82 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
83 static inline void guest_enter(void)
85 if (vtime_accounting_enabled())
86 vtime_guest_enter(current);
88 current->flags |= PF_VCPU;
90 if (context_tracking_is_enabled())
91 context_tracking_enter(CONTEXT_GUEST);
94 static inline void guest_exit(void)
96 if (context_tracking_is_enabled())
97 context_tracking_exit(CONTEXT_GUEST);
99 if (vtime_accounting_enabled())
100 vtime_guest_exit(current);
102 current->flags &= ~PF_VCPU;
106 static inline void guest_enter(void)
109 * This is running in ioctl context so its safe
110 * to assume that it's the stime pending cputime
113 vtime_account_system(current);
114 current->flags |= PF_VCPU;
117 static inline void guest_exit(void)
119 /* Flush the guest cputime we spent on the guest */
120 vtime_account_system(current);
121 current->flags &= ~PF_VCPU;
123 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */