xref: /linux/include/linux/sched/rt.h (revision c8990f3179e5636832fc22e6a262de5d50c797e3) 
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_SCHED_RT_H
3 #define _LINUX_SCHED_RT_H
4 
5 #include <linux/sched.h>
6 
7 struct task_struct;
8 
rt_prio(int prio)9 static inline bool rt_prio(int prio)
10 {
11 	return unlikely(prio < MAX_RT_PRIO && prio >= MAX_DL_PRIO);
12 }
13 
rt_or_dl_prio(int prio)14 static inline bool rt_or_dl_prio(int prio)
15 {
16 	return unlikely(prio < MAX_RT_PRIO);
17 }
18 
19 /*
20  * Returns true if a task has a priority that belongs to RT class. PI-boosted
21  * tasks will return true. Use rt_policy() to ignore PI-boosted tasks.
22  */
rt_task(struct task_struct * p)23 static inline bool rt_task(struct task_struct *p)
24 {
25 	return rt_prio(p->prio);
26 }
27 
28 /*
29  * Returns true if a task has a priority that belongs to RT or DL classes.
30  * PI-boosted tasks will return true. Use rt_or_dl_task_policy() to ignore
31  * PI-boosted tasks.
32  */
rt_or_dl_task(struct task_struct * p)33 static inline bool rt_or_dl_task(struct task_struct *p)
34 {
35 	return rt_or_dl_prio(p->prio);
36 }
37 
38 /*
39  * Returns true if a task has a policy that belongs to RT or DL classes.
40  * PI-boosted tasks will return false.
41  */
rt_or_dl_task_policy(struct task_struct * tsk)42 static inline bool rt_or_dl_task_policy(struct task_struct *tsk)
43 {
44 	int policy = tsk->policy;
45 
46 	if (policy == SCHED_FIFO || policy == SCHED_RR)
47 		return true;
48 	if (policy == SCHED_DEADLINE)
49 		return true;
50 	return false;
51 }
52 
53 #ifdef CONFIG_RT_MUTEXES
54 extern void rt_mutex_pre_schedule(void);
55 extern void rt_mutex_futex_pre_schedule(void);
56 extern void rt_mutex_schedule(void);
57 extern void rt_mutex_post_schedule(void);
58 extern void rt_mutex_futex_post_schedule(void);
59 
60 /*
61  * Must hold either p->pi_lock or task_rq(p)->lock.
62  */
rt_mutex_get_top_task(struct task_struct * p)63 static inline struct task_struct *rt_mutex_get_top_task(struct task_struct *p)
64 {
65 	return p->pi_top_task;
66 }
67 extern void rt_mutex_setprio(struct task_struct *p, struct task_struct *pi_task);
68 extern void rt_mutex_adjust_pi(struct task_struct *p);
69 #else
rt_mutex_get_top_task(struct task_struct * task)70 static inline struct task_struct *rt_mutex_get_top_task(struct task_struct *task)
71 {
72 	return NULL;
73 }
74 # define rt_mutex_adjust_pi(p)		do { } while (0)
75 #endif
76 
77 extern void normalize_rt_tasks(void);
78 
79 
80 /*
81  * default timeslice is 100 msecs (used only for SCHED_RR tasks).
82  * Timeslices get refilled after they expire.
83  */
84 #define RR_TIMESLICE		(100 * HZ / 1000)
85 
86 #endif /* _LINUX_SCHED_RT_H */
87