1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * BPF extensible scheduler class: Documentation/scheduler/sched-ext.rst
4 *
5 * Copyright (c) 2022 Meta Platforms, Inc. and affiliates.
6 * Copyright (c) 2022 Tejun Heo <tj@kernel.org>
7 * Copyright (c) 2022 David Vernet <dvernet@meta.com>
8 */
9 #ifdef CONFIG_SCHED_CLASS_EXT
10
11 void scx_tick(struct rq *rq);
12 void init_scx_entity(struct sched_ext_entity *scx);
13 void scx_pre_fork(struct task_struct *p);
14 int scx_fork(struct task_struct *p);
15 void scx_post_fork(struct task_struct *p);
16 void scx_cancel_fork(struct task_struct *p);
17 bool scx_can_stop_tick(struct rq *rq);
18 void scx_rq_activate(struct rq *rq);
19 void scx_rq_deactivate(struct rq *rq);
20 int scx_check_setscheduler(struct task_struct *p, int policy);
21 bool task_should_scx(int policy);
22 void init_sched_ext_class(void);
23
24 static inline u32 scx_cpuperf_target(s32 cpu)
25 {
26 if (scx_enabled())
27 return cpu_rq(cpu)->scx.cpuperf_target;
28 else
29 return 0;
30 }
31
32 static inline bool task_on_scx(const struct task_struct *p)
33 {
34 return scx_enabled() && p->sched_class == &ext_sched_class;
35 }
36
37 #ifdef CONFIG_SCHED_CORE
38 bool scx_prio_less(const struct task_struct *a, const struct task_struct *b,
39 bool in_fi);
40 #endif
41
42 #else /* CONFIG_SCHED_CLASS_EXT */
43
44 static inline void scx_tick(struct rq *rq) {}
45 static inline void scx_pre_fork(struct task_struct *p) {}
46 static inline int scx_fork(struct task_struct *p) { return 0; }
47 static inline void scx_post_fork(struct task_struct *p) {}
48 static inline void scx_cancel_fork(struct task_struct *p) {}
49 static inline u32 scx_cpuperf_target(s32 cpu) { return 0; }
50 static inline bool scx_can_stop_tick(struct rq *rq) { return true; }
51 static inline void scx_rq_activate(struct rq *rq) {}
52 static inline void scx_rq_deactivate(struct rq *rq) {}
53 static inline int scx_check_setscheduler(struct task_struct *p, int policy) { return 0; }
54 static inline bool task_on_scx(const struct task_struct *p) { return false; }
55 static inline void init_sched_ext_class(void) {}
56
57 #endif /* CONFIG_SCHED_CLASS_EXT */
58
59 #if defined(CONFIG_SCHED_CLASS_EXT) && defined(CONFIG_SMP)
60 void __scx_update_idle(struct rq *rq, bool idle);
61
62 static inline void scx_update_idle(struct rq *rq, bool idle)
63 {
64 if (scx_enabled())
65 __scx_update_idle(rq, idle);
66 }
67 #else
68 static inline void scx_update_idle(struct rq *rq, bool idle) {}
69 #endif
70
71 #ifdef CONFIG_CGROUP_SCHED
72 #ifdef CONFIG_EXT_GROUP_SCHED
73 int scx_tg_online(struct task_group *tg);
74 void scx_tg_offline(struct task_group *tg);
75 int scx_cgroup_can_attach(struct cgroup_taskset *tset);
76 void scx_move_task(struct task_struct *p);
77 void scx_cgroup_finish_attach(void);
78 void scx_cgroup_cancel_attach(struct cgroup_taskset *tset);
79 void scx_group_set_weight(struct task_group *tg, unsigned long cgrp_weight);
80 void scx_group_set_idle(struct task_group *tg, bool idle);
81 #else /* CONFIG_EXT_GROUP_SCHED */
82 static inline int scx_tg_online(struct task_group *tg) { return 0; }
83 static inline void scx_tg_offline(struct task_group *tg) {}
84 static inline int scx_cgroup_can_attach(struct cgroup_taskset *tset) { return 0; }
85 static inline void scx_move_task(struct task_struct *p) {}
86 static inline void scx_cgroup_finish_attach(void) {}
87 static inline void scx_cgroup_cancel_attach(struct cgroup_taskset *tset) {}
88 static inline void scx_group_set_weight(struct task_group *tg, unsigned long cgrp_weight) {}
89 static inline void scx_group_set_idle(struct task_group *tg, bool idle) {}
90 #endif /* CONFIG_EXT_GROUP_SCHED */
91 #endif /* CONFIG_CGROUP_SCHED */
92
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