1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * Copyright (c) 2024 Meta Platforms, Inc. and affiliates.
 4 * Copyright (c) 2024 David Vernet <dvernet@meta.com>
 5 */
 6
 7#include <scx/common.bpf.h>
 8
 9char _license[] SEC("license") = "GPL";
10
11#include "exit_test.h"
12
13const volatile int exit_point;
14UEI_DEFINE(uei);
15
16#define EXIT_CLEANLY() scx_bpf_exit(exit_point, "%d", exit_point)
17
18#define DSQ_ID 0
19
20s32 BPF_STRUCT_OPS(exit_select_cpu, struct task_struct *p,
21		   s32 prev_cpu, u64 wake_flags)
22{
23	bool found;
24
25	if (exit_point == EXIT_SELECT_CPU)
26		EXIT_CLEANLY();
27
28	return scx_bpf_select_cpu_dfl(p, prev_cpu, wake_flags, &found);
29}
30
31void BPF_STRUCT_OPS(exit_enqueue, struct task_struct *p, u64 enq_flags)
32{
33	if (exit_point == EXIT_ENQUEUE)
34		EXIT_CLEANLY();
35
36	scx_bpf_dsq_insert(p, DSQ_ID, SCX_SLICE_DFL, enq_flags);
37}
38
39void BPF_STRUCT_OPS(exit_dispatch, s32 cpu, struct task_struct *p)
40{
41	if (exit_point == EXIT_DISPATCH)
42		EXIT_CLEANLY();
43
44	scx_bpf_dsq_move_to_local(DSQ_ID);
45}
46
47void BPF_STRUCT_OPS(exit_enable, struct task_struct *p)
48{
49	if (exit_point == EXIT_ENABLE)
50		EXIT_CLEANLY();
51}
52
53s32 BPF_STRUCT_OPS(exit_init_task, struct task_struct *p,
54		    struct scx_init_task_args *args)
55{
56	if (exit_point == EXIT_INIT_TASK)
57		EXIT_CLEANLY();
58
59	return 0;
60}
61
62void BPF_STRUCT_OPS(exit_exit, struct scx_exit_info *ei)
63{
64	UEI_RECORD(uei, ei);
65}
66
67s32 BPF_STRUCT_OPS_SLEEPABLE(exit_init)
68{
69	if (exit_point == EXIT_INIT)
70		EXIT_CLEANLY();
71
72	return scx_bpf_create_dsq(DSQ_ID, -1);
73}
74
75SEC(".struct_ops.link")
76struct sched_ext_ops exit_ops = {
77	.select_cpu		= (void *) exit_select_cpu,
78	.enqueue		= (void *) exit_enqueue,
79	.dispatch		= (void *) exit_dispatch,
80	.init_task		= (void *) exit_init_task,
81	.enable			= (void *) exit_enable,
82	.exit			= (void *) exit_exit,
83	.init			= (void *) exit_init,
84	.name			= "exit",
85	.timeout_ms		= 1000U,
86};