Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
11extern void context_tracking_cpu_set(int cpu);
12
13extern void context_tracking_enter(enum ctx_state state);
14extern void context_tracking_exit(enum ctx_state state);
15extern void context_tracking_user_enter(void);
16extern void context_tracking_user_exit(void);
17extern void __context_tracking_task_switch(struct task_struct *prev,
18 struct task_struct *next);
19
20static inline void user_enter(void)
21{
22 if (context_tracking_is_enabled())
23 context_tracking_user_enter();
24
25}
26static inline void user_exit(void)
27{
28 if (context_tracking_is_enabled())
29 context_tracking_user_exit();
30}
31
32static 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
46static 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
54static 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
61static inline void user_enter(void) { }
62static inline void user_exit(void) { }
63static inline enum ctx_state exception_enter(void) { return 0; }
64static inline void exception_exit(enum ctx_state prev_ctx) { }
65static 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
71extern void context_tracking_init(void);
72#else
73static inline void context_tracking_init(void) { }
74#endif /* CONFIG_CONTEXT_TRACKING_FORCE */
75
76
77#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
78static 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
89static 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
101static 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
112static 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