1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * A scheduler that validates the behavior of direct dispatching with a default
4  * select_cpu implementation.
5  *
6  * Copyright (c) 2023 Meta Platforms, Inc. and affiliates.
7  * Copyright (c) 2023 David Vernet <[email protected]>
8  * Copyright (c) 2023 Tejun Heo <[email protected]>
9  */
10 
11 #include <scx/common.bpf.h>
12 
13 char _license[] SEC("license") = "GPL";
14 
15 UEI_DEFINE(uei);
16 
17 s32 BPF_STRUCT_OPS(select_cpu_dispatch_bad_dsq_select_cpu, struct task_struct *p,
18 		   s32 prev_cpu, u64 wake_flags)
19 {
20 	/* Dispatching to a random DSQ should fail. */
21 	scx_bpf_dsq_insert(p, 0xcafef00d, SCX_SLICE_DFL, 0);
22 
23 	return prev_cpu;
24 }
25 
26 void BPF_STRUCT_OPS(select_cpu_dispatch_bad_dsq_exit, struct scx_exit_info *ei)
27 {
28 	UEI_RECORD(uei, ei);
29 }
30 
31 SEC(".struct_ops.link")
32 struct sched_ext_ops select_cpu_dispatch_bad_dsq_ops = {
33 	.select_cpu		= (void *) select_cpu_dispatch_bad_dsq_select_cpu,
34 	.exit			= (void *) select_cpu_dispatch_bad_dsq_exit,
35 	.name			= "select_cpu_dispatch_bad_dsq",
36 	.timeout_ms		= 1000U,
37 };
38