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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2025 Andrea Righi <arighi@nvidia.com>
*/
#include <bpf/bpf.h>
#include <scx/common.h>
#include <sys/wait.h>
#include <unistd.h>
#include "allowed_cpus.bpf.skel.h"
#include "scx_test.h"
static enum scx_test_status setup(void **ctx)
{
struct allowed_cpus *skel;
skel = allowed_cpus__open();
SCX_FAIL_IF(!skel, "Failed to open");
SCX_ENUM_INIT(skel);
SCX_FAIL_IF(allowed_cpus__load(skel), "Failed to load skel");
*ctx = skel;
return SCX_TEST_PASS;
}
static int test_select_cpu_from_user(const struct allowed_cpus *skel)
{
int fd, ret;
__u64 args[1];
LIBBPF_OPTS(bpf_test_run_opts, attr,
.ctx_in = args,
.ctx_size_in = sizeof(args),
);
args[0] = getpid();
fd = bpf_program__fd(skel->progs.select_cpu_from_user);
if (fd < 0)
return fd;
ret = bpf_prog_test_run_opts(fd, &attr);
if (ret < 0)
return ret;
fprintf(stderr, "%s: CPU %d\n", __func__, attr.retval);
return 0;
}
static enum scx_test_status run(void *ctx)
{
struct allowed_cpus *skel = ctx;
struct bpf_link *link;
link = bpf_map__attach_struct_ops(skel->maps.allowed_cpus_ops);
SCX_FAIL_IF(!link, "Failed to attach scheduler");
/* Pick an idle CPU from user-space */
SCX_FAIL_IF(test_select_cpu_from_user(skel), "Failed to pick idle CPU");
/* Just sleeping is fine, plenty of scheduling events happening */
sleep(1);
SCX_EQ(skel->data->uei.kind, EXIT_KIND(SCX_EXIT_NONE));
bpf_link__destroy(link);
return SCX_TEST_PASS;
}
static void cleanup(void *ctx)
{
struct allowed_cpus *skel = ctx;
allowed_cpus__destroy(skel);
}
struct scx_test allowed_cpus = {
.name = "allowed_cpus",
.description = "Verify scx_bpf_select_cpu_and()",
.setup = setup,
.run = run,
.cleanup = cleanup,
};
REGISTER_SCX_TEST(&allowed_cpus)
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