// SPDX-License-Identifier: GPL-2.0 #include <test_progs.h> void test_stacktrace_map(void) { int control_map_fd, stackid_hmap_fd, stackmap_fd, stack_amap_fd; const char *prog_name = "oncpu"; int err, prog_fd, stack_trace_len; const char *file = "./test_stacktrace_map.o"; __u32 key, val, duration = 0; struct bpf_program *prog; struct bpf_object *obj; struct bpf_link *link; err = bpf_prog_test_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd); if (CHECK(err, "prog_load", "err %d errno %d\n", err, errno)) return; prog = bpf_object__find_program_by_name(obj, prog_name); if (CHECK(!prog, "find_prog", "prog '%s' not found\n", prog_name)) goto close_prog; link = bpf_program__attach_tracepoint(prog, "sched", "sched_switch"); if (!ASSERT_OK_PTR(link, "attach_tp")) goto close_prog; /* find map fds */ control_map_fd = bpf_find_map(__func__, obj, "control_map"); if (CHECK_FAIL(control_map_fd < 0)) goto disable_pmu; stackid_hmap_fd = bpf_find_map(__func__, obj, "stackid_hmap"); if (CHECK_FAIL(stackid_hmap_fd < 0)) goto disable_pmu; stackmap_fd = bpf_find_map(__func__, obj, "stackmap"); if (CHECK_FAIL(stackmap_fd < 0)) goto disable_pmu; stack_amap_fd = bpf_find_map(__func__, obj, "stack_amap"); if (CHECK_FAIL(stack_amap_fd < 0)) goto disable_pmu; /* give some time for bpf program run */ sleep(1); /* disable stack trace collection */ key = 0; val = 1; bpf_map_update_elem(control_map_fd, &key, &val, 0); /* for every element in stackid_hmap, we can find a corresponding one * in stackmap, and vise versa. */ err = compare_map_keys(stackid_hmap_fd, stackmap_fd); if (CHECK(err, "compare_map_keys stackid_hmap vs. stackmap", "err %d errno %d\n", err, errno)) goto disable_pmu; err = compare_map_keys(stackmap_fd, stackid_hmap_fd); if (CHECK(err, "compare_map_keys stackmap vs. stackid_hmap", "err %d errno %d\n", err, errno)) goto disable_pmu; stack_trace_len = PERF_MAX_STACK_DEPTH * sizeof(__u64); err = compare_stack_ips(stackmap_fd, stack_amap_fd, stack_trace_len); if (CHECK(err, "compare_stack_ips stackmap vs. stack_amap", "err %d errno %d\n", err, errno)) goto disable_pmu; disable_pmu: bpf_link__destroy(link); close_prog: bpf_object__close(obj); }