1/* SPDX-License-Identifier: GPL-2.0 */
  2/*
  3 * A scheduler with every callback defined.
  4 *
  5 * This scheduler defines every callback.
  6 *
  7 * Copyright (c) 2024 Meta Platforms, Inc. and affiliates.
  8 * Copyright (c) 2024 David Vernet <dvernet@meta.com>
  9 */
 10
 11#include <scx/common.bpf.h>
 12
 13char _license[] SEC("license") = "GPL";
 14
 15#define DSQ_ID 0
 16
 17s32 BPF_STRUCT_OPS(maximal_select_cpu, struct task_struct *p, s32 prev_cpu,
 18		   u64 wake_flags)
 19{
 20	return prev_cpu;
 21}
 22
 23void BPF_STRUCT_OPS(maximal_enqueue, struct task_struct *p, u64 enq_flags)
 24{
 25	scx_bpf_dsq_insert(p, DSQ_ID, SCX_SLICE_DFL, enq_flags);
 26}
 27
 28void BPF_STRUCT_OPS(maximal_dequeue, struct task_struct *p, u64 deq_flags)
 29{}
 30
 31void BPF_STRUCT_OPS(maximal_dispatch, s32 cpu, struct task_struct *prev)
 32{
 33	scx_bpf_dsq_move_to_local(DSQ_ID);
 34}
 35
 36void BPF_STRUCT_OPS(maximal_runnable, struct task_struct *p, u64 enq_flags)
 37{}
 38
 39void BPF_STRUCT_OPS(maximal_running, struct task_struct *p)
 40{}
 41
 42void BPF_STRUCT_OPS(maximal_stopping, struct task_struct *p, bool runnable)
 43{}
 44
 45void BPF_STRUCT_OPS(maximal_quiescent, struct task_struct *p, u64 deq_flags)
 46{}
 47
 48bool BPF_STRUCT_OPS(maximal_yield, struct task_struct *from,
 49		    struct task_struct *to)
 50{
 51	return false;
 52}
 53
 54bool BPF_STRUCT_OPS(maximal_core_sched_before, struct task_struct *a,
 55		    struct task_struct *b)
 56{
 57	return false;
 58}
 59
 60void BPF_STRUCT_OPS(maximal_set_weight, struct task_struct *p, u32 weight)
 61{}
 62
 63void BPF_STRUCT_OPS(maximal_set_cpumask, struct task_struct *p,
 64		    const struct cpumask *cpumask)
 65{}
 66
 67void BPF_STRUCT_OPS(maximal_update_idle, s32 cpu, bool idle)
 68{}
 69
 70void BPF_STRUCT_OPS(maximal_cpu_acquire, s32 cpu,
 71		    struct scx_cpu_acquire_args *args)
 72{}
 73
 74void BPF_STRUCT_OPS(maximal_cpu_release, s32 cpu,
 75		    struct scx_cpu_release_args *args)
 76{}
 77
 78void BPF_STRUCT_OPS(maximal_cpu_online, s32 cpu)
 79{}
 80
 81void BPF_STRUCT_OPS(maximal_cpu_offline, s32 cpu)
 82{}
 83
 84s32 BPF_STRUCT_OPS(maximal_init_task, struct task_struct *p,
 85		   struct scx_init_task_args *args)
 86{
 87	return 0;
 88}
 89
 90void BPF_STRUCT_OPS(maximal_enable, struct task_struct *p)
 91{}
 92
 93void BPF_STRUCT_OPS(maximal_exit_task, struct task_struct *p,
 94		    struct scx_exit_task_args *args)
 95{}
 96
 97void BPF_STRUCT_OPS(maximal_disable, struct task_struct *p)
 98{}
 99
100s32 BPF_STRUCT_OPS(maximal_cgroup_init, struct cgroup *cgrp,
101		   struct scx_cgroup_init_args *args)
102{
103	return 0;
104}
105
106void BPF_STRUCT_OPS(maximal_cgroup_exit, struct cgroup *cgrp)
107{}
108
109s32 BPF_STRUCT_OPS(maximal_cgroup_prep_move, struct task_struct *p,
110		   struct cgroup *from, struct cgroup *to)
111{
112	return 0;
113}
114
115void BPF_STRUCT_OPS(maximal_cgroup_move, struct task_struct *p,
116		    struct cgroup *from, struct cgroup *to)
117{}
118
119void BPF_STRUCT_OPS(maximal_cgroup_cancel_move, struct task_struct *p,
120	       struct cgroup *from, struct cgroup *to)
121{}
122
123void BPF_STRUCT_OPS(maximal_cgroup_set_weight, struct cgroup *cgrp, u32 weight)
124{}
125
126s32 BPF_STRUCT_OPS_SLEEPABLE(maximal_init)
127{
128	return scx_bpf_create_dsq(DSQ_ID, -1);
129}
130
131void BPF_STRUCT_OPS(maximal_exit, struct scx_exit_info *info)
132{}
133
134SEC(".struct_ops.link")
135struct sched_ext_ops maximal_ops = {
136	.select_cpu		= (void *) maximal_select_cpu,
137	.enqueue		= (void *) maximal_enqueue,
138	.dequeue		= (void *) maximal_dequeue,
139	.dispatch		= (void *) maximal_dispatch,
140	.runnable		= (void *) maximal_runnable,
141	.running		= (void *) maximal_running,
142	.stopping		= (void *) maximal_stopping,
143	.quiescent		= (void *) maximal_quiescent,
144	.yield			= (void *) maximal_yield,
145	.core_sched_before	= (void *) maximal_core_sched_before,
146	.set_weight		= (void *) maximal_set_weight,
147	.set_cpumask		= (void *) maximal_set_cpumask,
148	.update_idle		= (void *) maximal_update_idle,
149	.cpu_acquire		= (void *) maximal_cpu_acquire,
150	.cpu_release		= (void *) maximal_cpu_release,
151	.cpu_online		= (void *) maximal_cpu_online,
152	.cpu_offline		= (void *) maximal_cpu_offline,
153	.init_task		= (void *) maximal_init_task,
154	.enable			= (void *) maximal_enable,
155	.exit_task		= (void *) maximal_exit_task,
156	.disable		= (void *) maximal_disable,
157	.cgroup_init		= (void *) maximal_cgroup_init,
158	.cgroup_exit		= (void *) maximal_cgroup_exit,
159	.cgroup_prep_move	= (void *) maximal_cgroup_prep_move,
160	.cgroup_move		= (void *) maximal_cgroup_move,
161	.cgroup_cancel_move	= (void *) maximal_cgroup_cancel_move,
162	.cgroup_set_weight	= (void *) maximal_cgroup_set_weight,
163	.init			= (void *) maximal_init,
164	.exit			= (void *) maximal_exit,
165	.name			= "maximal",
166};