// 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)