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Linux kernel mirror (for testing)
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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 * Copyright (c) 2024 Tejun Heo <tj@kernel.org>
6 */
7#include <bpf/bpf.h>
8#include <scx/common.h>
9#include <unistd.h>
10#include "ddsp_vtimelocal_fail.bpf.skel.h"
11#include "scx_test.h"
12
13static enum scx_test_status setup(void **ctx)
14{
15 struct ddsp_vtimelocal_fail *skel;
16
17 skel = ddsp_vtimelocal_fail__open();
18 SCX_FAIL_IF(!skel, "Failed to open");
19 SCX_ENUM_INIT(skel);
20 SCX_FAIL_IF(ddsp_vtimelocal_fail__load(skel), "Failed to load skel");
21
22 *ctx = skel;
23
24 return SCX_TEST_PASS;
25}
26
27static enum scx_test_status run(void *ctx)
28{
29 struct ddsp_vtimelocal_fail *skel = ctx;
30 struct bpf_link *link;
31
32 link = bpf_map__attach_struct_ops(skel->maps.ddsp_vtimelocal_fail_ops);
33 SCX_FAIL_IF(!link, "Failed to attach struct_ops");
34
35 sleep(1);
36
37 SCX_EQ(skel->data->uei.kind, EXIT_KIND(SCX_EXIT_ERROR));
38 bpf_link__destroy(link);
39
40 return SCX_TEST_PASS;
41}
42
43static void cleanup(void *ctx)
44{
45 struct ddsp_vtimelocal_fail *skel = ctx;
46
47 ddsp_vtimelocal_fail__destroy(skel);
48}
49
50struct scx_test ddsp_vtimelocal_fail = {
51 .name = "ddsp_vtimelocal_fail",
52 .description = "Verify we gracefully fail, and fall back to using a "
53 "built-in DSQ, if we do a direct vtime dispatch to a "
54 "built-in DSQ from DSQ in ops.select_cpu()",
55 .setup = setup,
56 .run = run,
57 .cleanup = cleanup,
58};
59REGISTER_SCX_TEST(&ddsp_vtimelocal_fail)