1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2023 Meta Platforms, Inc. and affiliates.
4 * Copyright (c) 2023 David Vernet <dvernet@meta.com>
5 * Copyright (c) 2023 Tejun Heo <tj@kernel.org>
6 */
7 #include <bpf/bpf.h>
8 #include <scx/common.h>
9 #include <sys/wait.h>
10 #include <unistd.h>
11 #include "enq_select_cpu.bpf.skel.h"
12 #include "scx_test.h"
13
setup(void ** ctx)14 static enum scx_test_status setup(void **ctx)
15 {
16 struct enq_select_cpu *skel;
17
18 skel = enq_select_cpu__open();
19 SCX_FAIL_IF(!skel, "Failed to open");
20 SCX_ENUM_INIT(skel);
21 SCX_FAIL_IF(enq_select_cpu__load(skel), "Failed to load skel");
22
23 *ctx = skel;
24
25 return SCX_TEST_PASS;
26 }
27
test_select_cpu_from_user(const struct enq_select_cpu * skel)28 static int test_select_cpu_from_user(const struct enq_select_cpu *skel)
29 {
30 int fd, ret;
31 __u64 args[1];
32
33 LIBBPF_OPTS(bpf_test_run_opts, attr,
34 .ctx_in = args,
35 .ctx_size_in = sizeof(args),
36 );
37
38 args[0] = getpid();
39 fd = bpf_program__fd(skel->progs.select_cpu_from_user);
40 if (fd < 0)
41 return fd;
42
43 ret = bpf_prog_test_run_opts(fd, &attr);
44 if (ret < 0)
45 return ret;
46
47 fprintf(stderr, "%s: CPU %d\n", __func__, attr.retval);
48
49 return 0;
50 }
51
run(void * ctx)52 static enum scx_test_status run(void *ctx)
53 {
54 struct enq_select_cpu *skel = ctx;
55 struct bpf_link *link;
56
57 link = bpf_map__attach_struct_ops(skel->maps.enq_select_cpu_ops);
58 if (!link) {
59 SCX_ERR("Failed to attach scheduler");
60 return SCX_TEST_FAIL;
61 }
62
63 /* Pick an idle CPU from user-space */
64 SCX_FAIL_IF(test_select_cpu_from_user(skel), "Failed to pick idle CPU");
65
66 sleep(1);
67
68 SCX_EQ(skel->data->uei.kind, EXIT_KIND(SCX_EXIT_NONE));
69 bpf_link__destroy(link);
70
71 return SCX_TEST_PASS;
72 }
73
cleanup(void * ctx)74 static void cleanup(void *ctx)
75 {
76 struct enq_select_cpu *skel = ctx;
77
78 enq_select_cpu__destroy(skel);
79 }
80
81 struct scx_test enq_select_cpu = {
82 .name = "enq_select_cpu",
83 .description = "Verify scx_bpf_select_cpu_dfl() from multiple contexts",
84 .setup = setup,
85 .run = run,
86 .cleanup = cleanup,
87 };
88 REGISTER_SCX_TEST(&enq_select_cpu)
89