1 // SPDX-License-Identifier: GPL-2.0
6 #include <linux/perf_event.h>
11 #include <sys/ioctl.h>
12 #include <sys/resource.h>
14 #include <sys/types.h>
22 #define SAMPLE_PERIOD 0x7fffffffffffffffULL
24 static void check_on_cpu(int cpu, struct perf_event_attr *attr)
26 struct bpf_perf_event_value value2;
27 int pmu_fd, error = 0;
31 /* Move to target CPU */
34 assert(sched_setaffinity(0, sizeof(set), &set) == 0);
35 /* Open perf event and attach to the perf_event_array */
36 pmu_fd = sys_perf_event_open(attr, -1/*pid*/, cpu/*cpu*/, -1/*group_fd*/, 0);
38 fprintf(stderr, "sys_perf_event_open failed on CPU %d\n", cpu);
42 assert(bpf_map_update_elem(map_fd[0], &cpu, &pmu_fd, BPF_ANY) == 0);
43 assert(ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0) == 0);
44 /* Trigger the kprobe */
45 bpf_map_get_next_key(map_fd[1], &cpu, NULL);
47 if (bpf_map_lookup_elem(map_fd[1], &cpu, &value)) {
48 fprintf(stderr, "Value missing for CPU %d\n", cpu);
52 fprintf(stderr, "CPU %d: %llu\n", cpu, value);
54 /* The above bpf_map_lookup_elem should trigger the second kprobe */
55 if (bpf_map_lookup_elem(map_fd[2], &cpu, &value2)) {
56 fprintf(stderr, "Value2 missing for CPU %d\n", cpu);
60 fprintf(stderr, "CPU %d: counter: %llu, enabled: %llu, running: %llu\n", cpu,
61 value2.counter, value2.enabled, value2.running);
65 assert(bpf_map_delete_elem(map_fd[0], &cpu) == 0 || error);
66 assert(ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE, 0) == 0 || error);
67 assert(close(pmu_fd) == 0 || error);
68 assert(bpf_map_delete_elem(map_fd[1], &cpu) == 0 || error);
72 static void test_perf_event_array(struct perf_event_attr *attr,
75 int i, status, nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
79 printf("Test reading %s counters\n", name);
81 for (i = 0; i < nr_cpus; i++) {
85 check_on_cpu(i, attr);
90 for (i = 0; i < nr_cpus; i++) {
91 assert(waitpid(pid[i], &status, 0) == pid[i]);
96 printf("Test: %s FAILED\n", name);
99 static void test_bpf_perf_event(void)
101 struct perf_event_attr attr_cycles = {
103 .sample_period = SAMPLE_PERIOD,
105 .type = PERF_TYPE_HARDWARE,
108 .config = PERF_COUNT_HW_CPU_CYCLES,
110 struct perf_event_attr attr_clock = {
112 .sample_period = SAMPLE_PERIOD,
114 .type = PERF_TYPE_SOFTWARE,
117 .config = PERF_COUNT_SW_CPU_CLOCK,
119 struct perf_event_attr attr_raw = {
121 .sample_period = SAMPLE_PERIOD,
123 .type = PERF_TYPE_RAW,
126 /* Intel Instruction Retired */
129 struct perf_event_attr attr_l1d_load = {
131 .sample_period = SAMPLE_PERIOD,
133 .type = PERF_TYPE_HW_CACHE,
137 PERF_COUNT_HW_CACHE_L1D |
138 (PERF_COUNT_HW_CACHE_OP_READ << 8) |
139 (PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16),
141 struct perf_event_attr attr_llc_miss = {
143 .sample_period = SAMPLE_PERIOD,
145 .type = PERF_TYPE_HW_CACHE,
149 PERF_COUNT_HW_CACHE_LL |
150 (PERF_COUNT_HW_CACHE_OP_READ << 8) |
151 (PERF_COUNT_HW_CACHE_RESULT_MISS << 16),
153 struct perf_event_attr attr_msr_tsc = {
157 /* From /sys/bus/event_source/devices/msr/ */
164 test_perf_event_array(&attr_cycles, "HARDWARE-cycles");
165 test_perf_event_array(&attr_clock, "SOFTWARE-clock");
166 test_perf_event_array(&attr_raw, "RAW-instruction-retired");
167 test_perf_event_array(&attr_l1d_load, "HW_CACHE-L1D-load");
169 /* below tests may fail in qemu */
170 test_perf_event_array(&attr_llc_miss, "HW_CACHE-LLC-miss");
171 test_perf_event_array(&attr_msr_tsc, "Dynamic-msr-tsc");
174 int main(int argc, char **argv)
176 struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
179 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
181 setrlimit(RLIMIT_MEMLOCK, &r);
182 if (load_bpf_file(filename)) {
183 printf("%s", bpf_log_buf);
187 test_bpf_perf_event();