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 #include <bpf/bpf.h>
7 #include <sched.h>
8 #include <scx/common.h>
9 #include <sys/wait.h>
10 #include <unistd.h>
11 #include "exit.bpf.skel.h"
12 #include "scx_test.h"
13
14 #include "exit_test.h"
15
run(void * ctx)16 static enum scx_test_status run(void *ctx)
17 {
18 enum exit_test_case tc;
19
20 for (tc = 0; tc < NUM_EXITS; tc++) {
21 struct exit *skel;
22 struct bpf_link *link;
23 char buf[16];
24
25 /*
26 * On single-CPU systems, ops.select_cpu() is never
27 * invoked, so skip this test to avoid getting stuck
28 * indefinitely.
29 */
30 if (tc == EXIT_SELECT_CPU && libbpf_num_possible_cpus() == 1)
31 continue;
32
33 skel = exit__open();
34 SCX_ENUM_INIT(skel);
35 skel->rodata->exit_point = tc;
36 exit__load(skel);
37 link = bpf_map__attach_struct_ops(skel->maps.exit_ops);
38 if (!link) {
39 SCX_ERR("Failed to attach scheduler");
40 exit__destroy(skel);
41 return SCX_TEST_FAIL;
42 }
43
44 /* Assumes uei.kind is written last */
45 while (skel->data->uei.kind == EXIT_KIND(SCX_EXIT_NONE))
46 sched_yield();
47
48 SCX_EQ(skel->data->uei.kind, EXIT_KIND(SCX_EXIT_UNREG_BPF));
49 SCX_EQ(skel->data->uei.exit_code, tc);
50 sprintf(buf, "%d", tc);
51 SCX_ASSERT(!strcmp(skel->data->uei.msg, buf));
52 bpf_link__destroy(link);
53 exit__destroy(skel);
54 }
55
56 return SCX_TEST_PASS;
57 }
58
59 struct scx_test exit_test = {
60 .name = "exit",
61 .description = "Verify we can cleanly exit a scheduler in multiple places",
62 .run = run,
63 };
64 REGISTER_SCX_TEST(&exit_test)
65