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
housekeeping_any_cpu(enum hk_type type)32 static inline int housekeeping_any_cpu(enum hk_type type)
33 {
34 return smp_processor_id();
35 }
36
housekeeping_cpumask(enum hk_type type)37 static inline const struct cpumask *housekeeping_cpumask(enum hk_type type)
38 {
39 return cpu_possible_mask;
40 }
41
housekeeping_enabled(enum hk_type type)42 static inline bool housekeeping_enabled(enum hk_type type)
43 {
44 return false;
45 }
46
housekeeping_affine(struct task_struct * t,enum hk_type type)47 static inline void housekeeping_affine(struct task_struct *t,
48 enum hk_type type) { }
49
housekeeping_test_cpu(int cpu,enum hk_type type)50 static inline bool housekeeping_test_cpu(int cpu, enum hk_type type)
51 {
52 return true;
53 }
54
housekeeping_init(void)55 static inline void housekeeping_init(void) { }
56 #endif /* CONFIG_CPU_ISOLATION */
57
housekeeping_cpu(int cpu,enum hk_type type)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
cpu_is_isolated(int cpu)67 static inline bool cpu_is_isolated(int cpu)
68 {
69 return !housekeeping_test_cpu(cpu, HK_TYPE_DOMAIN) ||
70 !housekeeping_test_cpu(cpu, HK_TYPE_TICK);
71 }
72
73 #endif /* _LINUX_SCHED_ISOLATION_H */
74