xref: /linux-6.15/include/linux/sched/isolation.h (revision e00a844a)
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_flags {
9 	HK_FLAG_TIMER		= 1,
10 	HK_FLAG_RCU		= (1 << 1),
11 	HK_FLAG_MISC		= (1 << 2),
12 	HK_FLAG_SCHED		= (1 << 3),
13 	HK_FLAG_TICK		= (1 << 4),
14 	HK_FLAG_DOMAIN		= (1 << 5),
15 };
16 
17 #ifdef CONFIG_CPU_ISOLATION
18 DECLARE_STATIC_KEY_FALSE(housekeeping_overriden);
19 extern int housekeeping_any_cpu(enum hk_flags flags);
20 extern const struct cpumask *housekeeping_cpumask(enum hk_flags flags);
21 extern void housekeeping_affine(struct task_struct *t, enum hk_flags flags);
22 extern bool housekeeping_test_cpu(int cpu, enum hk_flags flags);
23 extern void __init housekeeping_init(void);
24 
25 #else
26 
27 static inline int housekeeping_any_cpu(enum hk_flags flags)
28 {
29 	return smp_processor_id();
30 }
31 
32 static inline const struct cpumask *housekeeping_cpumask(enum hk_flags flags)
33 {
34 	return cpu_possible_mask;
35 }
36 
37 static inline void housekeeping_affine(struct task_struct *t,
38 				       enum hk_flags flags) { }
39 static inline void housekeeping_init(void) { }
40 #endif /* CONFIG_CPU_ISOLATION */
41 
42 static inline bool housekeeping_cpu(int cpu, enum hk_flags flags)
43 {
44 #ifdef CONFIG_CPU_ISOLATION
45 	if (static_branch_unlikely(&housekeeping_overriden))
46 		return housekeeping_test_cpu(cpu, flags);
47 #endif
48 	return true;
49 }
50 
51 #endif /* _LINUX_SCHED_ISOLATION_H */
52