1 #ifndef _LINUX_SCHED_ISOLATION_H
2 #define _LINUX_SCHED_ISOLATION_H
3
4 #include <linux/cpumask.h>
5 #include <linux/cpuset.h>
6 #include <linux/init.h>
7 #include <linux/tick.h>
8
9 enum hk_type {
10 HK_TYPE_TIMER,
11 HK_TYPE_RCU,
12 HK_TYPE_MISC,
13 HK_TYPE_SCHED,
14 HK_TYPE_TICK,
15 HK_TYPE_DOMAIN,
16 HK_TYPE_WQ,
17 HK_TYPE_MANAGED_IRQ,
18 HK_TYPE_KTHREAD,
19 HK_TYPE_MAX
20 };
21
22 #ifdef CONFIG_CPU_ISOLATION
23 DECLARE_STATIC_KEY_FALSE(housekeeping_overridden);
24 extern int housekeeping_any_cpu(enum hk_type type);
25 extern const struct cpumask *housekeeping_cpumask(enum hk_type type);
26 extern bool housekeeping_enabled(enum hk_type type);
27 extern void housekeeping_affine(struct task_struct *t, enum hk_type type);
28 extern bool housekeeping_test_cpu(int cpu, enum hk_type type);
29 extern void __init housekeeping_init(void);
30
31 #else
32
housekeeping_any_cpu(enum hk_type type)33 static inline int housekeeping_any_cpu(enum hk_type type)
34 {
35 return smp_processor_id();
36 }
37
housekeeping_cpumask(enum hk_type type)38 static inline const struct cpumask *housekeeping_cpumask(enum hk_type type)
39 {
40 return cpu_possible_mask;
41 }
42
housekeeping_enabled(enum hk_type type)43 static inline bool housekeeping_enabled(enum hk_type type)
44 {
45 return false;
46 }
47
housekeeping_affine(struct task_struct * t,enum hk_type type)48 static inline void housekeeping_affine(struct task_struct *t,
49 enum hk_type type) { }
50
housekeeping_test_cpu(int cpu,enum hk_type type)51 static inline bool housekeeping_test_cpu(int cpu, enum hk_type type)
52 {
53 return true;
54 }
55
housekeeping_init(void)56 static inline void housekeeping_init(void) { }
57 #endif /* CONFIG_CPU_ISOLATION */
58
housekeeping_cpu(int cpu,enum hk_type type)59 static inline bool housekeeping_cpu(int cpu, enum hk_type type)
60 {
61 #ifdef CONFIG_CPU_ISOLATION
62 if (static_branch_unlikely(&housekeeping_overridden))
63 return housekeeping_test_cpu(cpu, type);
64 #endif
65 return true;
66 }
67
cpu_is_isolated(int cpu)68 static inline bool cpu_is_isolated(int cpu)
69 {
70 return !housekeeping_test_cpu(cpu, HK_TYPE_DOMAIN) ||
71 !housekeeping_test_cpu(cpu, HK_TYPE_TICK) ||
72 cpuset_cpu_is_isolated(cpu);
73 }
74
75 #endif /* _LINUX_SCHED_ISOLATION_H */
76