/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. * Copyright (c) 2024 David Vernet <dvernet@meta.com> */ #include <bpf/bpf.h> #include <sched.h> #include <scx/common.h> #include <sys/wait.h> #include <unistd.h> #include "exit.bpf.skel.h" #include "scx_test.h" #include "exit_test.h" static enum scx_test_status run(void *ctx) { enum exit_test_case tc; for (tc = 0; tc < NUM_EXITS; tc++) { struct exit *skel; struct bpf_link *link; char buf[16]; /* * On single-CPU systems, ops.select_cpu() is never * invoked, so skip this test to avoid getting stuck * indefinitely. */ if (tc == EXIT_SELECT_CPU && libbpf_num_possible_cpus() == 1) continue; skel = exit__open(); SCX_ENUM_INIT(skel); skel->rodata->exit_point = tc; SCX_FAIL_IF(exit__load(skel), "Failed to load skel"); link = bpf_map__attach_struct_ops(skel->maps.exit_ops); if (!link) { SCX_ERR("Failed to attach scheduler"); exit__destroy(skel); return SCX_TEST_FAIL; } /* Assumes uei.kind is written last */ while (skel->data->uei.kind == EXIT_KIND(SCX_EXIT_NONE)) sched_yield(); SCX_EQ(skel->data->uei.kind, EXIT_KIND(SCX_EXIT_UNREG_BPF)); SCX_EQ(skel->data->uei.exit_code, tc); sprintf(buf, "%d", tc); SCX_ASSERT(!strcmp(skel->data->uei.msg, buf)); bpf_link__destroy(link); exit__destroy(skel); } return SCX_TEST_PASS; } struct scx_test exit_test = { .name = "exit", .description = "Verify we can cleanly exit a scheduler in multiple places", .run = run, }; REGISTER_SCX_TEST(&exit_test)