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 extern void __context_tracking_task_switch(struct task_struct *prev,
18 					   struct task_struct *next);
19 
user_enter(void)20 static inline void user_enter(void)
21 {
22 	if (context_tracking_is_enabled())
23 		context_tracking_user_enter();
24 
25 }
user_exit(void)26 static inline void user_exit(void)
27 {
28 	if (context_tracking_is_enabled())
29 		context_tracking_user_exit();
30 }
31 
exception_enter(void)32 static inline enum ctx_state exception_enter(void)
33 {
34 	enum ctx_state prev_ctx;
35 
36 	if (!context_tracking_is_enabled())
37 		return 0;
38 
39 	prev_ctx = this_cpu_read(context_tracking.state);
40 	if (prev_ctx != CONTEXT_KERNEL)
41 		context_tracking_exit(prev_ctx);
42 
43 	return prev_ctx;
44 }
45 
exception_exit(enum ctx_state prev_ctx)46 static inline void exception_exit(enum ctx_state prev_ctx)
47 {
48 	if (context_tracking_is_enabled()) {
49 		if (prev_ctx != CONTEXT_KERNEL)
50 			context_tracking_enter(prev_ctx);
51 	}
52 }
53 
context_tracking_task_switch(struct task_struct * prev,struct task_struct * next)54 static inline void context_tracking_task_switch(struct task_struct *prev,
55 						struct task_struct *next)
56 {
57 	if (context_tracking_is_enabled())
58 		__context_tracking_task_switch(prev, next);
59 }
60 #else
user_enter(void)61 static inline void user_enter(void) { }
user_exit(void)62 static inline void user_exit(void) { }
exception_enter(void)63 static inline enum ctx_state exception_enter(void) { return 0; }
exception_exit(enum ctx_state prev_ctx)64 static inline void exception_exit(enum ctx_state prev_ctx) { }
context_tracking_task_switch(struct task_struct * prev,struct task_struct * next)65 static inline void context_tracking_task_switch(struct task_struct *prev,
66 						struct task_struct *next) { }
67 #endif /* !CONFIG_CONTEXT_TRACKING */
68 
69 
70 #ifdef CONFIG_CONTEXT_TRACKING_FORCE
71 extern void context_tracking_init(void);
72 #else
context_tracking_init(void)73 static inline void context_tracking_init(void) { }
74 #endif /* CONFIG_CONTEXT_TRACKING_FORCE */
75 
76 
77 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
guest_enter(void)78 static inline void guest_enter(void)
79 {
80 	if (vtime_accounting_enabled())
81 		vtime_guest_enter(current);
82 	else
83 		current->flags |= PF_VCPU;
84 
85 	if (context_tracking_is_enabled())
86 		context_tracking_enter(CONTEXT_GUEST);
87 }
88 
guest_exit(void)89 static inline void guest_exit(void)
90 {
91 	if (context_tracking_is_enabled())
92 		context_tracking_exit(CONTEXT_GUEST);
93 
94 	if (vtime_accounting_enabled())
95 		vtime_guest_exit(current);
96 	else
97 		current->flags &= ~PF_VCPU;
98 }
99 
100 #else
guest_enter(void)101 static inline void guest_enter(void)
102 {
103 	/*
104 	 * This is running in ioctl context so its safe
105 	 * to assume that it's the stime pending cputime
106 	 * to flush.
107 	 */
108 	vtime_account_system(current);
109 	current->flags |= PF_VCPU;
110 }
111 
guest_exit(void)112 static inline void guest_exit(void)
113 {
114 	/* Flush the guest cputime we spent on the guest */
115 	vtime_account_system(current);
116 	current->flags &= ~PF_VCPU;
117 }
118 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */
119 
120 #endif
121