1 | #ifndef _LINUX_SCHED_ISOLATION_H |
2 | #define _LINUX_SCHED_ISOLATION_H |
3 | |
4 | #include <linux/cpumask.h> |
5 | #include <linux/init.h> |
6 | #include <linux/tick.h> |
7 | |
8 | enum hk_type { |
9 | HK_TYPE_TIMER, |
10 | HK_TYPE_RCU, |
11 | HK_TYPE_MISC, |
12 | HK_TYPE_SCHED, |
13 | HK_TYPE_TICK, |
14 | HK_TYPE_DOMAIN, |
15 | HK_TYPE_WQ, |
16 | HK_TYPE_MANAGED_IRQ, |
17 | HK_TYPE_KTHREAD, |
18 | HK_TYPE_MAX |
19 | }; |
20 | |
21 | #ifdef CONFIG_CPU_ISOLATION |
22 | DECLARE_STATIC_KEY_FALSE(housekeeping_overridden); |
23 | extern int housekeeping_any_cpu(enum hk_type type); |
24 | extern const struct cpumask *housekeeping_cpumask(enum hk_type type); |
25 | extern bool housekeeping_enabled(enum hk_type type); |
26 | extern void housekeeping_affine(struct task_struct *t, enum hk_type type); |
27 | extern bool housekeeping_test_cpu(int cpu, enum hk_type type); |
28 | extern void __init housekeeping_init(void); |
29 | |
30 | #else |
31 | |
32 | static inline int housekeeping_any_cpu(enum hk_type type) |
33 | { |
34 | return smp_processor_id(); |
35 | } |
36 | |
37 | static inline const struct cpumask *housekeeping_cpumask(enum hk_type type) |
38 | { |
39 | return cpu_possible_mask; |
40 | } |
41 | |
42 | static inline bool housekeeping_enabled(enum hk_type type) |
43 | { |
44 | return false; |
45 | } |
46 | |
47 | static inline void housekeeping_affine(struct task_struct *t, |
48 | enum hk_type type) { } |
49 | |
50 | static inline bool housekeeping_test_cpu(int cpu, enum hk_type type) |
51 | { |
52 | return true; |
53 | } |
54 | |
55 | static inline void housekeeping_init(void) { } |
56 | #endif /* CONFIG_CPU_ISOLATION */ |
57 | |
58 | static inline bool housekeeping_cpu(int cpu, enum hk_type type) |
59 | { |
60 | #ifdef CONFIG_CPU_ISOLATION |
61 | if (static_branch_unlikely(&housekeeping_overridden)) |
62 | return housekeeping_test_cpu(cpu, type); |
63 | #endif |
64 | return true; |
65 | } |
66 | |
67 | static inline bool cpu_is_isolated(int cpu) |
68 | { |
69 | return !housekeeping_test_cpu(cpu, type: HK_TYPE_DOMAIN) || |
70 | !housekeeping_test_cpu(cpu, type: HK_TYPE_TICK); |
71 | } |
72 | |
73 | #endif /* _LINUX_SCHED_ISOLATION_H */ |
74 | |