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
9 char _license[] SEC("license") = "GPL";
10
11 #include "hotplug_test.h"
12
13 UEI_DEFINE(uei);
14
15 void BPF_STRUCT_OPS(hotplug_exit, struct scx_exit_info *ei)
16 {
17 UEI_RECORD(uei, ei);
18 }
19
20 static void exit_from_hotplug(s32 cpu, bool onlining)
21 {
22 /*
23 * Ignored, just used to verify that we can invoke blocking kfuncs
24 * from the hotplug path.
25 */
26 scx_bpf_create_dsq(0, -1);
27
28 s64 code = SCX_ECODE_ACT_RESTART | HOTPLUG_EXIT_RSN;
29
30 if (onlining)
31 code |= HOTPLUG_ONLINING;
32
33 scx_bpf_exit(code, "hotplug event detected (%d going %s)", cpu,
34 onlining ? "online" : "offline");
35 }
36
37 void BPF_STRUCT_OPS_SLEEPABLE(hotplug_cpu_online, s32 cpu)
38 {
39 exit_from_hotplug(cpu, true);
40 }
41
42 void BPF_STRUCT_OPS_SLEEPABLE(hotplug_cpu_offline, s32 cpu)
43 {
44 exit_from_hotplug(cpu, false);
45 }
46
47 SEC(".struct_ops.link")
48 struct sched_ext_ops hotplug_cb_ops = {
49 .cpu_online = (void *) hotplug_cpu_online,
50 .cpu_offline = (void *) hotplug_cpu_offline,
51 .exit = (void *) hotplug_exit,
52 .name = "hotplug_cbs",
53 .timeout_ms = 1000U,
54 };
55
56 SEC(".struct_ops.link")
57 struct sched_ext_ops hotplug_nocb_ops = {
58 .exit = (void *) hotplug_exit,
59 .name = "hotplug_nocbs",
60 .timeout_ms = 1000U,
61 };
62
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