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1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (c) 2016 Facebook
3 */
4#include <stdio.h>
5#include <unistd.h>
6#include <stdlib.h>
7#include <stdbool.h>
8#include <string.h>
9#include <fcntl.h>
10#include <poll.h>
11#include <sys/ioctl.h>
12#include <linux/perf_event.h>
13#include <linux/bpf.h>
14#include <signal.h>
15#include <assert.h>
16#include <errno.h>
17#include <sys/resource.h>
18#include "libbpf.h"
19#include "bpf_load.h"
20#include "perf-sys.h"
21#include "trace_helpers.h"
22
23#define SAMPLE_FREQ 50
24
25static bool sys_read_seen, sys_write_seen;
26
27static void print_ksym(__u64 addr)
28{
29 struct ksym *sym;
30
31 if (!addr)
32 return;
33 sym = ksym_search(addr);
34 if (!sym) {
35 printf("ksym not found. Is kallsyms loaded?\n");
36 return;
37 }
38
39 printf("%s;", sym->name);
40 if (!strcmp(sym->name, "sys_read"))
41 sys_read_seen = true;
42 else if (!strcmp(sym->name, "sys_write"))
43 sys_write_seen = true;
44}
45
46static void print_addr(__u64 addr)
47{
48 if (!addr)
49 return;
50 printf("%llx;", addr);
51}
52
53#define TASK_COMM_LEN 16
54
55struct key_t {
56 char comm[TASK_COMM_LEN];
57 __u32 kernstack;
58 __u32 userstack;
59};
60
61static void print_stack(struct key_t *key, __u64 count)
62{
63 __u64 ip[PERF_MAX_STACK_DEPTH] = {};
64 static bool warned;
65 int i;
66
67 printf("%3lld %s;", count, key->comm);
68 if (bpf_map_lookup_elem(map_fd[1], &key->kernstack, ip) != 0) {
69 printf("---;");
70 } else {
71 for (i = PERF_MAX_STACK_DEPTH - 1; i >= 0; i--)
72 print_ksym(ip[i]);
73 }
74 printf("-;");
75 if (bpf_map_lookup_elem(map_fd[1], &key->userstack, ip) != 0) {
76 printf("---;");
77 } else {
78 for (i = PERF_MAX_STACK_DEPTH - 1; i >= 0; i--)
79 print_addr(ip[i]);
80 }
81 if (count < 6)
82 printf("\r");
83 else
84 printf("\n");
85
86 if (key->kernstack == -EEXIST && !warned) {
87 printf("stackmap collisions seen. Consider increasing size\n");
88 warned = true;
89 } else if ((int)key->kernstack < 0 && (int)key->userstack < 0) {
90 printf("err stackid %d %d\n", key->kernstack, key->userstack);
91 }
92}
93
94static void int_exit(int sig)
95{
96 kill(0, SIGKILL);
97 exit(0);
98}
99
100static void print_stacks(void)
101{
102 struct key_t key = {}, next_key;
103 __u64 value;
104 __u32 stackid = 0, next_id;
105 int fd = map_fd[0], stack_map = map_fd[1];
106
107 sys_read_seen = sys_write_seen = false;
108 while (bpf_map_get_next_key(fd, &key, &next_key) == 0) {
109 bpf_map_lookup_elem(fd, &next_key, &value);
110 print_stack(&next_key, value);
111 bpf_map_delete_elem(fd, &next_key);
112 key = next_key;
113 }
114 printf("\n");
115 if (!sys_read_seen || !sys_write_seen) {
116 printf("BUG kernel stack doesn't contain sys_read() and sys_write()\n");
117 int_exit(0);
118 }
119
120 /* clear stack map */
121 while (bpf_map_get_next_key(stack_map, &stackid, &next_id) == 0) {
122 bpf_map_delete_elem(stack_map, &next_id);
123 stackid = next_id;
124 }
125}
126
127static inline int generate_load(void)
128{
129 if (system("dd if=/dev/zero of=/dev/null count=5000k status=none") < 0) {
130 printf("failed to generate some load with dd: %s\n", strerror(errno));
131 return -1;
132 }
133
134 return 0;
135}
136
137static void test_perf_event_all_cpu(struct perf_event_attr *attr)
138{
139 int nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
140 int *pmu_fd = malloc(nr_cpus * sizeof(int));
141 int i, error = 0;
142
143 /* system wide perf event, no need to inherit */
144 attr->inherit = 0;
145
146 /* open perf_event on all cpus */
147 for (i = 0; i < nr_cpus; i++) {
148 pmu_fd[i] = sys_perf_event_open(attr, -1, i, -1, 0);
149 if (pmu_fd[i] < 0) {
150 printf("sys_perf_event_open failed\n");
151 error = 1;
152 goto all_cpu_err;
153 }
154 assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_SET_BPF, prog_fd[0]) == 0);
155 assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_ENABLE) == 0);
156 }
157
158 if (generate_load() < 0) {
159 error = 1;
160 goto all_cpu_err;
161 }
162 print_stacks();
163all_cpu_err:
164 for (i--; i >= 0; i--) {
165 ioctl(pmu_fd[i], PERF_EVENT_IOC_DISABLE);
166 close(pmu_fd[i]);
167 }
168 free(pmu_fd);
169 if (error)
170 int_exit(0);
171}
172
173static void test_perf_event_task(struct perf_event_attr *attr)
174{
175 int pmu_fd, error = 0;
176
177 /* per task perf event, enable inherit so the "dd ..." command can be traced properly.
178 * Enabling inherit will cause bpf_perf_prog_read_time helper failure.
179 */
180 attr->inherit = 1;
181
182 /* open task bound event */
183 pmu_fd = sys_perf_event_open(attr, 0, -1, -1, 0);
184 if (pmu_fd < 0) {
185 printf("sys_perf_event_open failed\n");
186 int_exit(0);
187 }
188 assert(ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd[0]) == 0);
189 assert(ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE) == 0);
190
191 if (generate_load() < 0) {
192 error = 1;
193 goto err;
194 }
195 print_stacks();
196err:
197 ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE);
198 close(pmu_fd);
199 if (error)
200 int_exit(0);
201}
202
203static void test_bpf_perf_event(void)
204{
205 struct perf_event_attr attr_type_hw = {
206 .sample_freq = SAMPLE_FREQ,
207 .freq = 1,
208 .type = PERF_TYPE_HARDWARE,
209 .config = PERF_COUNT_HW_CPU_CYCLES,
210 };
211 struct perf_event_attr attr_type_sw = {
212 .sample_freq = SAMPLE_FREQ,
213 .freq = 1,
214 .type = PERF_TYPE_SOFTWARE,
215 .config = PERF_COUNT_SW_CPU_CLOCK,
216 };
217 struct perf_event_attr attr_hw_cache_l1d = {
218 .sample_freq = SAMPLE_FREQ,
219 .freq = 1,
220 .type = PERF_TYPE_HW_CACHE,
221 .config =
222 PERF_COUNT_HW_CACHE_L1D |
223 (PERF_COUNT_HW_CACHE_OP_READ << 8) |
224 (PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16),
225 };
226 struct perf_event_attr attr_hw_cache_branch_miss = {
227 .sample_freq = SAMPLE_FREQ,
228 .freq = 1,
229 .type = PERF_TYPE_HW_CACHE,
230 .config =
231 PERF_COUNT_HW_CACHE_BPU |
232 (PERF_COUNT_HW_CACHE_OP_READ << 8) |
233 (PERF_COUNT_HW_CACHE_RESULT_MISS << 16),
234 };
235 struct perf_event_attr attr_type_raw = {
236 .sample_freq = SAMPLE_FREQ,
237 .freq = 1,
238 .type = PERF_TYPE_RAW,
239 /* Intel Instruction Retired */
240 .config = 0xc0,
241 };
242 struct perf_event_attr attr_type_raw_lock_load = {
243 .sample_freq = SAMPLE_FREQ,
244 .freq = 1,
245 .type = PERF_TYPE_RAW,
246 /* Intel MEM_UOPS_RETIRED.LOCK_LOADS */
247 .config = 0x21d0,
248 /* Request to record lock address from PEBS */
249 .sample_type = PERF_SAMPLE_ADDR,
250 /* Record address value requires precise event */
251 .precise_ip = 2,
252 };
253
254 printf("Test HW_CPU_CYCLES\n");
255 test_perf_event_all_cpu(&attr_type_hw);
256 test_perf_event_task(&attr_type_hw);
257
258 printf("Test SW_CPU_CLOCK\n");
259 test_perf_event_all_cpu(&attr_type_sw);
260 test_perf_event_task(&attr_type_sw);
261
262 printf("Test HW_CACHE_L1D\n");
263 test_perf_event_all_cpu(&attr_hw_cache_l1d);
264 test_perf_event_task(&attr_hw_cache_l1d);
265
266 printf("Test HW_CACHE_BPU\n");
267 test_perf_event_all_cpu(&attr_hw_cache_branch_miss);
268 test_perf_event_task(&attr_hw_cache_branch_miss);
269
270 printf("Test Instruction Retired\n");
271 test_perf_event_all_cpu(&attr_type_raw);
272 test_perf_event_task(&attr_type_raw);
273
274 printf("Test Lock Load\n");
275 test_perf_event_all_cpu(&attr_type_raw_lock_load);
276 test_perf_event_task(&attr_type_raw_lock_load);
277
278 printf("*** PASS ***\n");
279}
280
281
282int main(int argc, char **argv)
283{
284 struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
285 char filename[256];
286
287 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
288 setrlimit(RLIMIT_MEMLOCK, &r);
289
290 signal(SIGINT, int_exit);
291 signal(SIGTERM, int_exit);
292
293 if (load_kallsyms()) {
294 printf("failed to process /proc/kallsyms\n");
295 return 1;
296 }
297
298 if (load_bpf_file(filename)) {
299 printf("%s", bpf_log_buf);
300 return 2;
301 }
302
303 if (fork() == 0) {
304 read_trace_pipe();
305 return 0;
306 }
307 test_bpf_perf_event();
308 int_exit(0);
309 return 0;
310}
1/* Copyright (c) 2016 Facebook
2 *
3 * This program is free software; you can redistribute it and/or
4 * modify it under the terms of version 2 of the GNU General Public
5 * License as published by the Free Software Foundation.
6 */
7#include <stdio.h>
8#include <unistd.h>
9#include <stdlib.h>
10#include <stdbool.h>
11#include <string.h>
12#include <fcntl.h>
13#include <poll.h>
14#include <sys/ioctl.h>
15#include <linux/perf_event.h>
16#include <linux/bpf.h>
17#include <signal.h>
18#include <assert.h>
19#include <errno.h>
20#include <sys/resource.h>
21#include "libbpf.h"
22#include "bpf_load.h"
23#include "perf-sys.h"
24
25#define SAMPLE_FREQ 50
26
27static bool sys_read_seen, sys_write_seen;
28
29static void print_ksym(__u64 addr)
30{
31 struct ksym *sym;
32
33 if (!addr)
34 return;
35 sym = ksym_search(addr);
36 printf("%s;", sym->name);
37 if (!strcmp(sym->name, "sys_read"))
38 sys_read_seen = true;
39 else if (!strcmp(sym->name, "sys_write"))
40 sys_write_seen = true;
41}
42
43static void print_addr(__u64 addr)
44{
45 if (!addr)
46 return;
47 printf("%llx;", addr);
48}
49
50#define TASK_COMM_LEN 16
51
52struct key_t {
53 char comm[TASK_COMM_LEN];
54 __u32 kernstack;
55 __u32 userstack;
56};
57
58static void print_stack(struct key_t *key, __u64 count)
59{
60 __u64 ip[PERF_MAX_STACK_DEPTH] = {};
61 static bool warned;
62 int i;
63
64 printf("%3lld %s;", count, key->comm);
65 if (bpf_map_lookup_elem(map_fd[1], &key->kernstack, ip) != 0) {
66 printf("---;");
67 } else {
68 for (i = PERF_MAX_STACK_DEPTH - 1; i >= 0; i--)
69 print_ksym(ip[i]);
70 }
71 printf("-;");
72 if (bpf_map_lookup_elem(map_fd[1], &key->userstack, ip) != 0) {
73 printf("---;");
74 } else {
75 for (i = PERF_MAX_STACK_DEPTH - 1; i >= 0; i--)
76 print_addr(ip[i]);
77 }
78 if (count < 6)
79 printf("\r");
80 else
81 printf("\n");
82
83 if (key->kernstack == -EEXIST && !warned) {
84 printf("stackmap collisions seen. Consider increasing size\n");
85 warned = true;
86 } else if ((int)key->kernstack < 0 && (int)key->userstack < 0) {
87 printf("err stackid %d %d\n", key->kernstack, key->userstack);
88 }
89}
90
91static void int_exit(int sig)
92{
93 kill(0, SIGKILL);
94 exit(0);
95}
96
97static void print_stacks(void)
98{
99 struct key_t key = {}, next_key;
100 __u64 value;
101 __u32 stackid = 0, next_id;
102 int fd = map_fd[0], stack_map = map_fd[1];
103
104 sys_read_seen = sys_write_seen = false;
105 while (bpf_map_get_next_key(fd, &key, &next_key) == 0) {
106 bpf_map_lookup_elem(fd, &next_key, &value);
107 print_stack(&next_key, value);
108 bpf_map_delete_elem(fd, &next_key);
109 key = next_key;
110 }
111 printf("\n");
112 if (!sys_read_seen || !sys_write_seen) {
113 printf("BUG kernel stack doesn't contain sys_read() and sys_write()\n");
114 int_exit(0);
115 }
116
117 /* clear stack map */
118 while (bpf_map_get_next_key(stack_map, &stackid, &next_id) == 0) {
119 bpf_map_delete_elem(stack_map, &next_id);
120 stackid = next_id;
121 }
122}
123
124static void test_perf_event_all_cpu(struct perf_event_attr *attr)
125{
126 int nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
127 int *pmu_fd = malloc(nr_cpus * sizeof(int));
128 int i, error = 0;
129
130 /* system wide perf event, no need to inherit */
131 attr->inherit = 0;
132
133 /* open perf_event on all cpus */
134 for (i = 0; i < nr_cpus; i++) {
135 pmu_fd[i] = sys_perf_event_open(attr, -1, i, -1, 0);
136 if (pmu_fd[i] < 0) {
137 printf("sys_perf_event_open failed\n");
138 error = 1;
139 goto all_cpu_err;
140 }
141 assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_SET_BPF, prog_fd[0]) == 0);
142 assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_ENABLE) == 0);
143 }
144 system("dd if=/dev/zero of=/dev/null count=5000k status=none");
145 print_stacks();
146all_cpu_err:
147 for (i--; i >= 0; i--) {
148 ioctl(pmu_fd[i], PERF_EVENT_IOC_DISABLE);
149 close(pmu_fd[i]);
150 }
151 free(pmu_fd);
152 if (error)
153 int_exit(0);
154}
155
156static void test_perf_event_task(struct perf_event_attr *attr)
157{
158 int pmu_fd;
159
160 /* per task perf event, enable inherit so the "dd ..." command can be traced properly.
161 * Enabling inherit will cause bpf_perf_prog_read_time helper failure.
162 */
163 attr->inherit = 1;
164
165 /* open task bound event */
166 pmu_fd = sys_perf_event_open(attr, 0, -1, -1, 0);
167 if (pmu_fd < 0) {
168 printf("sys_perf_event_open failed\n");
169 int_exit(0);
170 }
171 assert(ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd[0]) == 0);
172 assert(ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE) == 0);
173 system("dd if=/dev/zero of=/dev/null count=5000k status=none");
174 print_stacks();
175 ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE);
176 close(pmu_fd);
177}
178
179static void test_bpf_perf_event(void)
180{
181 struct perf_event_attr attr_type_hw = {
182 .sample_freq = SAMPLE_FREQ,
183 .freq = 1,
184 .type = PERF_TYPE_HARDWARE,
185 .config = PERF_COUNT_HW_CPU_CYCLES,
186 };
187 struct perf_event_attr attr_type_sw = {
188 .sample_freq = SAMPLE_FREQ,
189 .freq = 1,
190 .type = PERF_TYPE_SOFTWARE,
191 .config = PERF_COUNT_SW_CPU_CLOCK,
192 };
193 struct perf_event_attr attr_hw_cache_l1d = {
194 .sample_freq = SAMPLE_FREQ,
195 .freq = 1,
196 .type = PERF_TYPE_HW_CACHE,
197 .config =
198 PERF_COUNT_HW_CACHE_L1D |
199 (PERF_COUNT_HW_CACHE_OP_READ << 8) |
200 (PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16),
201 };
202 struct perf_event_attr attr_hw_cache_branch_miss = {
203 .sample_freq = SAMPLE_FREQ,
204 .freq = 1,
205 .type = PERF_TYPE_HW_CACHE,
206 .config =
207 PERF_COUNT_HW_CACHE_BPU |
208 (PERF_COUNT_HW_CACHE_OP_READ << 8) |
209 (PERF_COUNT_HW_CACHE_RESULT_MISS << 16),
210 };
211 struct perf_event_attr attr_type_raw = {
212 .sample_freq = SAMPLE_FREQ,
213 .freq = 1,
214 .type = PERF_TYPE_RAW,
215 /* Intel Instruction Retired */
216 .config = 0xc0,
217 };
218 struct perf_event_attr attr_type_raw_lock_load = {
219 .sample_freq = SAMPLE_FREQ,
220 .freq = 1,
221 .type = PERF_TYPE_RAW,
222 /* Intel MEM_UOPS_RETIRED.LOCK_LOADS */
223 .config = 0x21d0,
224 /* Request to record lock address from PEBS */
225 .sample_type = PERF_SAMPLE_ADDR,
226 /* Record address value requires precise event */
227 .precise_ip = 2,
228 };
229
230 printf("Test HW_CPU_CYCLES\n");
231 test_perf_event_all_cpu(&attr_type_hw);
232 test_perf_event_task(&attr_type_hw);
233
234 printf("Test SW_CPU_CLOCK\n");
235 test_perf_event_all_cpu(&attr_type_sw);
236 test_perf_event_task(&attr_type_sw);
237
238 printf("Test HW_CACHE_L1D\n");
239 test_perf_event_all_cpu(&attr_hw_cache_l1d);
240 test_perf_event_task(&attr_hw_cache_l1d);
241
242 printf("Test HW_CACHE_BPU\n");
243 test_perf_event_all_cpu(&attr_hw_cache_branch_miss);
244 test_perf_event_task(&attr_hw_cache_branch_miss);
245
246 printf("Test Instruction Retired\n");
247 test_perf_event_all_cpu(&attr_type_raw);
248 test_perf_event_task(&attr_type_raw);
249
250 printf("Test Lock Load\n");
251 test_perf_event_all_cpu(&attr_type_raw_lock_load);
252 test_perf_event_task(&attr_type_raw_lock_load);
253
254 printf("*** PASS ***\n");
255}
256
257
258int main(int argc, char **argv)
259{
260 struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
261 char filename[256];
262
263 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
264 setrlimit(RLIMIT_MEMLOCK, &r);
265
266 signal(SIGINT, int_exit);
267 signal(SIGTERM, int_exit);
268
269 if (load_kallsyms()) {
270 printf("failed to process /proc/kallsyms\n");
271 return 1;
272 }
273
274 if (load_bpf_file(filename)) {
275 printf("%s", bpf_log_buf);
276 return 2;
277 }
278
279 if (fork() == 0) {
280 read_trace_pipe();
281 return 0;
282 }
283 test_bpf_perf_event();
284 int_exit(0);
285 return 0;
286}