| // 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 *file = "./test_stacktrace_map.o"; |
| int bytes, efd, err, pmu_fd, prog_fd, stack_trace_len; |
| struct perf_event_attr attr = {}; |
| __u32 key, val, duration = 0; |
| struct bpf_object *obj; |
| char buf[256]; |
| |
| err = bpf_prog_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd); |
| if (CHECK(err, "prog_load", "err %d errno %d\n", err, errno)) |
| return; |
| |
| /* Get the ID for the sched/sched_switch tracepoint */ |
| snprintf(buf, sizeof(buf), |
| "/sys/kernel/debug/tracing/events/sched/sched_switch/id"); |
| efd = open(buf, O_RDONLY, 0); |
| if (CHECK(efd < 0, "open", "err %d errno %d\n", efd, errno)) |
| goto close_prog; |
| |
| bytes = read(efd, buf, sizeof(buf)); |
| close(efd); |
| if (bytes <= 0 || bytes >= sizeof(buf)) |
| goto close_prog; |
| |
| /* Open the perf event and attach bpf progrram */ |
| attr.config = strtol(buf, NULL, 0); |
| attr.type = PERF_TYPE_TRACEPOINT; |
| attr.sample_type = PERF_SAMPLE_RAW | PERF_SAMPLE_CALLCHAIN; |
| attr.sample_period = 1; |
| attr.wakeup_events = 1; |
| pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */, |
| 0 /* cpu 0 */, -1 /* group id */, |
| 0 /* flags */); |
| if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d\n", |
| pmu_fd, errno)) |
| goto close_prog; |
| |
| err = ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0); |
| if (err) |
| goto disable_pmu; |
| |
| err = ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd); |
| if (err) |
| goto disable_pmu; |
| |
| /* find map fds */ |
| control_map_fd = bpf_find_map(__func__, obj, "control_map"); |
| if (control_map_fd < 0) |
| goto disable_pmu; |
| |
| stackid_hmap_fd = bpf_find_map(__func__, obj, "stackid_hmap"); |
| if (stackid_hmap_fd < 0) |
| goto disable_pmu; |
| |
| stackmap_fd = bpf_find_map(__func__, obj, "stackmap"); |
| if (stackmap_fd < 0) |
| goto disable_pmu; |
| |
| stack_amap_fd = bpf_find_map(__func__, obj, "stack_amap"); |
| if (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_noerr; |
| |
| 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_noerr; |
| |
| 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_noerr; |
| |
| goto disable_pmu_noerr; |
| disable_pmu: |
| error_cnt++; |
| disable_pmu_noerr: |
| ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE); |
| close(pmu_fd); |
| close_prog: |
| bpf_object__close(obj); |
| } |