ddsp_vtimelocal_fail.c

 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)