Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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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);
17
18static inline void user_enter(void)
19{
20 if (context_tracking_is_enabled())
21 context_tracking_user_enter();
22
23}
24static inline void user_exit(void)
25{
26 if (context_tracking_is_enabled())
27 context_tracking_user_exit();
28}
29
30static inline enum ctx_state exception_enter(void)
31{
32 enum ctx_state prev_ctx;
33
34 if (!context_tracking_is_enabled())
35 return 0;
36
37 prev_ctx = this_cpu_read(context_tracking.state);
38 if (prev_ctx != CONTEXT_KERNEL)
39 context_tracking_exit(prev_ctx);
40
41 return prev_ctx;
42}
43
44static inline void exception_exit(enum ctx_state prev_ctx)
45{
46 if (context_tracking_is_enabled()) {
47 if (prev_ctx != CONTEXT_KERNEL)
48 context_tracking_enter(prev_ctx);
49 }
50}
51
52#else
53static inline void user_enter(void) { }
54static inline void user_exit(void) { }
55static inline enum ctx_state exception_enter(void) { return 0; }
56static inline void exception_exit(enum ctx_state prev_ctx) { }
57#endif /* !CONFIG_CONTEXT_TRACKING */
58
59
60#ifdef CONFIG_CONTEXT_TRACKING_FORCE
61extern void context_tracking_init(void);
62#else
63static inline void context_tracking_init(void) { }
64#endif /* CONFIG_CONTEXT_TRACKING_FORCE */
65
66
67#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
68static inline void guest_enter(void)
69{
70 if (vtime_accounting_enabled())
71 vtime_guest_enter(current);
72 else
73 current->flags |= PF_VCPU;
74
75 if (context_tracking_is_enabled())
76 context_tracking_enter(CONTEXT_GUEST);
77}
78
79static inline void guest_exit(void)
80{
81 if (context_tracking_is_enabled())
82 context_tracking_exit(CONTEXT_GUEST);
83
84 if (vtime_accounting_enabled())
85 vtime_guest_exit(current);
86 else
87 current->flags &= ~PF_VCPU;
88}
89
90#else
91static inline void guest_enter(void)
92{
93 /*
94 * This is running in ioctl context so its safe
95 * to assume that it's the stime pending cputime
96 * to flush.
97 */
98 vtime_account_system(current);
99 current->flags |= PF_VCPU;
100}
101
102static inline void guest_exit(void)
103{
104 /* Flush the guest cputime we spent on the guest */
105 vtime_account_system(current);
106 current->flags &= ~PF_VCPU;
107}
108#endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */
109
110#endif