1*a5db7817SDavid Vernet /* SPDX-License-Identifier: GPL-2.0 */
2*a5db7817SDavid Vernet /*
3*a5db7817SDavid Vernet * Copyright (c) 2023 Meta Platforms, Inc. and affiliates.
4*a5db7817SDavid Vernet * Copyright (c) 2023 David Vernet <dvernet@meta.com>
5*a5db7817SDavid Vernet * Copyright (c) 2023 Tejun Heo <tj@kernel.org>
6*a5db7817SDavid Vernet */
7*a5db7817SDavid Vernet #include <bpf/bpf.h>
8*a5db7817SDavid Vernet #include <scx/common.h>
9*a5db7817SDavid Vernet #include <sys/wait.h>
10*a5db7817SDavid Vernet #include <unistd.h>
11*a5db7817SDavid Vernet #include "select_cpu_dfl_nodispatch.bpf.skel.h"
12*a5db7817SDavid Vernet #include "scx_test.h"
13*a5db7817SDavid Vernet
14*a5db7817SDavid Vernet #define NUM_CHILDREN 1028
15*a5db7817SDavid Vernet
setup(void ** ctx)16*a5db7817SDavid Vernet static enum scx_test_status setup(void **ctx)
17*a5db7817SDavid Vernet {
18*a5db7817SDavid Vernet struct select_cpu_dfl_nodispatch *skel;
19*a5db7817SDavid Vernet
20*a5db7817SDavid Vernet skel = select_cpu_dfl_nodispatch__open_and_load();
21*a5db7817SDavid Vernet SCX_FAIL_IF(!skel, "Failed to open and load skel");
22*a5db7817SDavid Vernet *ctx = skel;
23*a5db7817SDavid Vernet
24*a5db7817SDavid Vernet return SCX_TEST_PASS;
25*a5db7817SDavid Vernet }
26*a5db7817SDavid Vernet
run(void * ctx)27*a5db7817SDavid Vernet static enum scx_test_status run(void *ctx)
28*a5db7817SDavid Vernet {
29*a5db7817SDavid Vernet struct select_cpu_dfl_nodispatch *skel = ctx;
30*a5db7817SDavid Vernet struct bpf_link *link;
31*a5db7817SDavid Vernet pid_t pids[NUM_CHILDREN];
32*a5db7817SDavid Vernet int i, status;
33*a5db7817SDavid Vernet
34*a5db7817SDavid Vernet link = bpf_map__attach_struct_ops(skel->maps.select_cpu_dfl_nodispatch_ops);
35*a5db7817SDavid Vernet SCX_FAIL_IF(!link, "Failed to attach scheduler");
36*a5db7817SDavid Vernet
37*a5db7817SDavid Vernet for (i = 0; i < NUM_CHILDREN; i++) {
38*a5db7817SDavid Vernet pids[i] = fork();
39*a5db7817SDavid Vernet if (pids[i] == 0) {
40*a5db7817SDavid Vernet sleep(1);
41*a5db7817SDavid Vernet exit(0);
42*a5db7817SDavid Vernet }
43*a5db7817SDavid Vernet }
44*a5db7817SDavid Vernet
45*a5db7817SDavid Vernet for (i = 0; i < NUM_CHILDREN; i++) {
46*a5db7817SDavid Vernet SCX_EQ(waitpid(pids[i], &status, 0), pids[i]);
47*a5db7817SDavid Vernet SCX_EQ(status, 0);
48*a5db7817SDavid Vernet }
49*a5db7817SDavid Vernet
50*a5db7817SDavid Vernet SCX_ASSERT(skel->bss->saw_local);
51*a5db7817SDavid Vernet
52*a5db7817SDavid Vernet bpf_link__destroy(link);
53*a5db7817SDavid Vernet
54*a5db7817SDavid Vernet return SCX_TEST_PASS;
55*a5db7817SDavid Vernet }
56*a5db7817SDavid Vernet
cleanup(void * ctx)57*a5db7817SDavid Vernet static void cleanup(void *ctx)
58*a5db7817SDavid Vernet {
59*a5db7817SDavid Vernet struct select_cpu_dfl_nodispatch *skel = ctx;
60*a5db7817SDavid Vernet
61*a5db7817SDavid Vernet select_cpu_dfl_nodispatch__destroy(skel);
62*a5db7817SDavid Vernet }
63*a5db7817SDavid Vernet
64*a5db7817SDavid Vernet struct scx_test select_cpu_dfl_nodispatch = {
65*a5db7817SDavid Vernet .name = "select_cpu_dfl_nodispatch",
66*a5db7817SDavid Vernet .description = "Verify behavior of scx_bpf_select_cpu_dfl() in "
67*a5db7817SDavid Vernet "ops.select_cpu()",
68*a5db7817SDavid Vernet .setup = setup,
69*a5db7817SDavid Vernet .run = run,
70*a5db7817SDavid Vernet .cleanup = cleanup,
71*a5db7817SDavid Vernet };
72*a5db7817SDavid Vernet REGISTER_SCX_TEST(&select_cpu_dfl_nodispatch)
73