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Linux/samples/bpf/tracex6_user.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #define _GNU_SOURCE
  3 
  4 #include <assert.h>
  5 #include <fcntl.h>
  6 #include <linux/perf_event.h>
  7 #include <linux/bpf.h>
  8 #include <sched.h>
  9 #include <stdio.h>
 10 #include <stdlib.h>
 11 #include <sys/ioctl.h>
 12 #include <sys/resource.h>
 13 #include <sys/time.h>
 14 #include <sys/types.h>
 15 #include <sys/wait.h>
 16 #include <unistd.h>
 17 
 18 #include "bpf_load.h"
 19 #include <bpf/bpf.h>
 20 #include "perf-sys.h"
 21 
 22 #define SAMPLE_PERIOD  0x7fffffffffffffffULL
 23 
 24 static void check_on_cpu(int cpu, struct perf_event_attr *attr)
 25 {
 26         struct bpf_perf_event_value value2;
 27         int pmu_fd, error = 0;
 28         cpu_set_t set;
 29         __u64 value;
 30 
 31         /* Move to target CPU */
 32         CPU_ZERO(&set);
 33         CPU_SET(cpu, &set);
 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);
 37         if (pmu_fd < 0) {
 38                 fprintf(stderr, "sys_perf_event_open failed on CPU %d\n", cpu);
 39                 error = 1;
 40                 goto on_exit;
 41         }
 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);
 46         /* Check the value */
 47         if (bpf_map_lookup_elem(map_fd[1], &cpu, &value)) {
 48                 fprintf(stderr, "Value missing for CPU %d\n", cpu);
 49                 error = 1;
 50                 goto on_exit;
 51         } else {
 52                 fprintf(stderr, "CPU %d: %llu\n", cpu, value);
 53         }
 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);
 57                 error = 1;
 58                 goto on_exit;
 59         } else {
 60                 fprintf(stderr, "CPU %d: counter: %llu, enabled: %llu, running: %llu\n", cpu,
 61                         value2.counter, value2.enabled, value2.running);
 62         }
 63 
 64 on_exit:
 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);
 69         exit(error);
 70 }
 71 
 72 static void test_perf_event_array(struct perf_event_attr *attr,
 73                                   const char *name)
 74 {
 75         int i, status, nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
 76         pid_t pid[nr_cpus];
 77         int err = 0;
 78 
 79         printf("Test reading %s counters\n", name);
 80 
 81         for (i = 0; i < nr_cpus; i++) {
 82                 pid[i] = fork();
 83                 assert(pid[i] >= 0);
 84                 if (pid[i] == 0) {
 85                         check_on_cpu(i, attr);
 86                         exit(1);
 87                 }
 88         }
 89 
 90         for (i = 0; i < nr_cpus; i++) {
 91                 assert(waitpid(pid[i], &status, 0) == pid[i]);
 92                 err |= status;
 93         }
 94 
 95         if (err)
 96                 printf("Test: %s FAILED\n", name);
 97 }
 98 
 99 static void test_bpf_perf_event(void)
100 {
101         struct perf_event_attr attr_cycles = {
102                 .freq = 0,
103                 .sample_period = SAMPLE_PERIOD,
104                 .inherit = 0,
105                 .type = PERF_TYPE_HARDWARE,
106                 .read_format = 0,
107                 .sample_type = 0,
108                 .config = PERF_COUNT_HW_CPU_CYCLES,
109         };
110         struct perf_event_attr attr_clock = {
111                 .freq = 0,
112                 .sample_period = SAMPLE_PERIOD,
113                 .inherit = 0,
114                 .type = PERF_TYPE_SOFTWARE,
115                 .read_format = 0,
116                 .sample_type = 0,
117                 .config = PERF_COUNT_SW_CPU_CLOCK,
118         };
119         struct perf_event_attr attr_raw = {
120                 .freq = 0,
121                 .sample_period = SAMPLE_PERIOD,
122                 .inherit = 0,
123                 .type = PERF_TYPE_RAW,
124                 .read_format = 0,
125                 .sample_type = 0,
126                 /* Intel Instruction Retired */
127                 .config = 0xc0,
128         };
129         struct perf_event_attr attr_l1d_load = {
130                 .freq = 0,
131                 .sample_period = SAMPLE_PERIOD,
132                 .inherit = 0,
133                 .type = PERF_TYPE_HW_CACHE,
134                 .read_format = 0,
135                 .sample_type = 0,
136                 .config =
137                         PERF_COUNT_HW_CACHE_L1D |
138                         (PERF_COUNT_HW_CACHE_OP_READ << 8) |
139                         (PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16),
140         };
141         struct perf_event_attr attr_llc_miss = {
142                 .freq = 0,
143                 .sample_period = SAMPLE_PERIOD,
144                 .inherit = 0,
145                 .type = PERF_TYPE_HW_CACHE,
146                 .read_format = 0,
147                 .sample_type = 0,
148                 .config =
149                         PERF_COUNT_HW_CACHE_LL |
150                         (PERF_COUNT_HW_CACHE_OP_READ << 8) |
151                         (PERF_COUNT_HW_CACHE_RESULT_MISS << 16),
152         };
153         struct perf_event_attr attr_msr_tsc = {
154                 .freq = 0,
155                 .sample_period = 0,
156                 .inherit = 0,
157                 /* From /sys/bus/event_source/devices/msr/ */
158                 .type = 7,
159                 .read_format = 0,
160                 .sample_type = 0,
161                 .config = 0,
162         };
163 
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");
168 
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");
172 }
173 
174 int main(int argc, char **argv)
175 {
176         struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
177         char filename[256];
178 
179         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
180 
181         setrlimit(RLIMIT_MEMLOCK, &r);
182         if (load_bpf_file(filename)) {
183                 printf("%s", bpf_log_buf);
184                 return 1;
185         }
186 
187         test_bpf_perf_event();
188         return 0;
189 }
190 

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