summaryrefslogtreecommitdiff
path: root/include/linux/context_tracking.h
blob: 158158704c30e75820913051283c6533ce669a4b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
#ifndef _LINUX_CONTEXT_TRACKING_H
#define _LINUX_CONTEXT_TRACKING_H

#include <linux/sched.h>
#include <linux/vtime.h>
#include <linux/context_tracking_state.h>
#include <asm/ptrace.h>


#ifdef CONFIG_CONTEXT_TRACKING
extern void context_tracking_cpu_set(int cpu);

extern void context_tracking_user_enter(void);
extern void context_tracking_user_exit(void);
extern void __context_tracking_task_switch(struct task_struct *prev,
					   struct task_struct *next);

static inline void user_enter(void)
{
	if (static_key_false(&context_tracking_enabled))
		context_tracking_user_enter();

}
static inline void user_exit(void)
{
	if (static_key_false(&context_tracking_enabled))
		context_tracking_user_exit();
}

static inline enum ctx_state exception_enter(void)
{
	enum ctx_state prev_ctx;

	if (!static_key_false(&context_tracking_enabled))
		return 0;

	prev_ctx = this_cpu_read(context_tracking.state);
	context_tracking_user_exit();

	return prev_ctx;
}

static inline void exception_exit(enum ctx_state prev_ctx)
{
	if (static_key_false(&context_tracking_enabled)) {
		if (prev_ctx == IN_USER)
			context_tracking_user_enter();
	}
}

static inline void context_tracking_task_switch(struct task_struct *prev,
						struct task_struct *next)
{
	if (static_key_false(&context_tracking_enabled))
		__context_tracking_task_switch(prev, next);
}
#else
static inline void user_enter(void) { }
static inline void user_exit(void) { }
static inline enum ctx_state exception_enter(void) { return 0; }
static inline void exception_exit(enum ctx_state prev_ctx) { }
static inline void context_tracking_task_switch(struct task_struct *prev,
						struct task_struct *next) { }
#endif /* !CONFIG_CONTEXT_TRACKING */


#ifdef CONFIG_CONTEXT_TRACKING_FORCE
extern void context_tracking_init(void);
#else
static inline void context_tracking_init(void) { }
#endif /* CONFIG_CONTEXT_TRACKING_FORCE */


#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
static inline void guest_enter(void)
{
	if (vtime_accounting_enabled())
		vtime_guest_enter(current);
	else
		current->flags |= PF_VCPU;
}

static inline void guest_exit(void)
{
	if (vtime_accounting_enabled())
		vtime_guest_exit(current);
	else
		current->flags &= ~PF_VCPU;
}

#else
static inline void guest_enter(void)
{
	/*
	 * This is running in ioctl context so its safe
	 * to assume that it's the stime pending cputime
	 * to flush.
	 */
	vtime_account_system(current);
	current->flags |= PF_VCPU;
}

static inline void guest_exit(void)
{
	/* Flush the guest cputime we spent on the guest */
	vtime_account_system(current);
	current->flags &= ~PF_VCPU;
}
#endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */

#endif