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25763b3c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1c47910e | 2 | /* Copyright (c) 2016 Facebook |
1c47910e AS |
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" | |
205c8ada | 20 | #include "perf-sys.h" |
28dbf861 | 21 | #include "trace_helpers.h" |
1c47910e AS |
22 | |
23 | #define SAMPLE_FREQ 50 | |
24 | ||
25 | static bool sys_read_seen, sys_write_seen; | |
26 | ||
27 | static void print_ksym(__u64 addr) | |
28 | { | |
29 | struct ksym *sym; | |
30 | ||
31 | if (!addr) | |
32 | return; | |
33 | sym = ksym_search(addr); | |
e67b2c71 DL |
34 | if (!sym) { |
35 | printf("ksym not found. Is kallsyms loaded?\n"); | |
36 | return; | |
37 | } | |
38 | ||
1c47910e AS |
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 | ||
46 | static void print_addr(__u64 addr) | |
47 | { | |
48 | if (!addr) | |
49 | return; | |
50 | printf("%llx;", addr); | |
51 | } | |
52 | ||
53 | #define TASK_COMM_LEN 16 | |
54 | ||
55 | struct key_t { | |
56 | char comm[TASK_COMM_LEN]; | |
57 | __u32 kernstack; | |
58 | __u32 userstack; | |
59 | }; | |
60 | ||
61 | static 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); | |
d40fc181 | 68 | if (bpf_map_lookup_elem(map_fd[1], &key->kernstack, ip) != 0) { |
1c47910e AS |
69 | printf("---;"); |
70 | } else { | |
71 | for (i = PERF_MAX_STACK_DEPTH - 1; i >= 0; i--) | |
72 | print_ksym(ip[i]); | |
73 | } | |
74 | printf("-;"); | |
d40fc181 | 75 | if (bpf_map_lookup_elem(map_fd[1], &key->userstack, ip) != 0) { |
1c47910e AS |
76 | printf("---;"); |
77 | } else { | |
78 | for (i = PERF_MAX_STACK_DEPTH - 1; i >= 0; i--) | |
79 | print_addr(ip[i]); | |
80 | } | |
41e9a804 TQ |
81 | if (count < 6) |
82 | printf("\r"); | |
83 | else | |
84 | printf("\n"); | |
1c47910e AS |
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 | ||
94 | static void int_exit(int sig) | |
95 | { | |
96 | kill(0, SIGKILL); | |
97 | exit(0); | |
98 | } | |
99 | ||
100 | static 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; | |
d40fc181 JS |
108 | while (bpf_map_get_next_key(fd, &key, &next_key) == 0) { |
109 | bpf_map_lookup_elem(fd, &next_key, &value); | |
1c47910e | 110 | print_stack(&next_key, value); |
d40fc181 | 111 | bpf_map_delete_elem(fd, &next_key); |
1c47910e AS |
112 | key = next_key; |
113 | } | |
41e9a804 | 114 | printf("\n"); |
1c47910e AS |
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 */ | |
d40fc181 JS |
121 | while (bpf_map_get_next_key(stack_map, &stackid, &next_id) == 0) { |
122 | bpf_map_delete_elem(stack_map, &next_id); | |
1c47910e AS |
123 | stackid = next_id; |
124 | } | |
125 | } | |
126 | ||
492b7e89 TS |
127 | static 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 | ||
1c47910e AS |
137 | static 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)); | |
41e9a804 | 141 | int i, error = 0; |
1c47910e | 142 | |
81b9cf80 YS |
143 | /* system wide perf event, no need to inherit */ |
144 | attr->inherit = 0; | |
145 | ||
1c47910e AS |
146 | /* open perf_event on all cpus */ |
147 | for (i = 0; i < nr_cpus; i++) { | |
205c8ada | 148 | pmu_fd[i] = sys_perf_event_open(attr, -1, i, -1, 0); |
1c47910e | 149 | if (pmu_fd[i] < 0) { |
205c8ada | 150 | printf("sys_perf_event_open failed\n"); |
41e9a804 | 151 | error = 1; |
1c47910e AS |
152 | goto all_cpu_err; |
153 | } | |
154 | assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_SET_BPF, prog_fd[0]) == 0); | |
41e9a804 | 155 | assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_ENABLE) == 0); |
1c47910e | 156 | } |
492b7e89 TS |
157 | |
158 | if (generate_load() < 0) { | |
159 | error = 1; | |
160 | goto all_cpu_err; | |
161 | } | |
1c47910e AS |
162 | print_stacks(); |
163 | all_cpu_err: | |
41e9a804 TQ |
164 | for (i--; i >= 0; i--) { |
165 | ioctl(pmu_fd[i], PERF_EVENT_IOC_DISABLE); | |
1c47910e | 166 | close(pmu_fd[i]); |
41e9a804 | 167 | } |
1c47910e | 168 | free(pmu_fd); |
41e9a804 TQ |
169 | if (error) |
170 | int_exit(0); | |
1c47910e AS |
171 | } |
172 | ||
173 | static void test_perf_event_task(struct perf_event_attr *attr) | |
174 | { | |
492b7e89 | 175 | int pmu_fd, error = 0; |
1c47910e | 176 | |
81b9cf80 YS |
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 | ||
1c47910e | 182 | /* open task bound event */ |
205c8ada | 183 | pmu_fd = sys_perf_event_open(attr, 0, -1, -1, 0); |
1c47910e | 184 | if (pmu_fd < 0) { |
205c8ada | 185 | printf("sys_perf_event_open failed\n"); |
41e9a804 | 186 | int_exit(0); |
1c47910e AS |
187 | } |
188 | assert(ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd[0]) == 0); | |
41e9a804 | 189 | assert(ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE) == 0); |
492b7e89 TS |
190 | |
191 | if (generate_load() < 0) { | |
192 | error = 1; | |
193 | goto err; | |
194 | } | |
1c47910e | 195 | print_stacks(); |
492b7e89 | 196 | err: |
41e9a804 | 197 | ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE); |
1c47910e | 198 | close(pmu_fd); |
492b7e89 TS |
199 | if (error) |
200 | int_exit(0); | |
1c47910e AS |
201 | } |
202 | ||
203 | static 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, | |
1c47910e AS |
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, | |
1c47910e | 216 | }; |
41e9a804 TQ |
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), | |
41e9a804 TQ |
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), | |
41e9a804 TQ |
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, | |
41e9a804 | 241 | }; |
12fe1225 TQ |
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 | }; | |
1c47910e | 253 | |
41e9a804 | 254 | printf("Test HW_CPU_CYCLES\n"); |
1c47910e AS |
255 | test_perf_event_all_cpu(&attr_type_hw); |
256 | test_perf_event_task(&attr_type_hw); | |
41e9a804 TQ |
257 | |
258 | printf("Test SW_CPU_CLOCK\n"); | |
1c47910e AS |
259 | test_perf_event_all_cpu(&attr_type_sw); |
260 | test_perf_event_task(&attr_type_sw); | |
41e9a804 TQ |
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 | ||
12fe1225 TQ |
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 | ||
41e9a804 | 278 | printf("*** PASS ***\n"); |
1c47910e AS |
279 | } |
280 | ||
281 | ||
282 | int 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); | |
ad990dbe | 291 | signal(SIGTERM, int_exit); |
1c47910e AS |
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(); | |
1c47910e AS |
308 | int_exit(0); |
309 | return 0; | |
310 | } |