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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
faf96706 AH |
2 | #include "evlist.h" |
3 | #include "evsel.h" | |
4 | #include "cpumap.h" | |
75562573 | 5 | #include "parse-events.h" |
a43783ae | 6 | #include <errno.h> |
cd0cfad7 | 7 | #include <api/fs/fs.h> |
67230479 | 8 | #include <subcmd/parse-options.h> |
714647bd | 9 | #include "util.h" |
57480d2c | 10 | #include "cloexec.h" |
75562573 | 11 | |
32dcd021 | 12 | typedef void (*setup_probe_fn_t)(struct evsel *evsel); |
75562573 AH |
13 | |
14 | static int perf_do_probe_api(setup_probe_fn_t fn, int cpu, const char *str) | |
15 | { | |
63503dba | 16 | struct evlist *evlist; |
32dcd021 | 17 | struct evsel *evsel; |
57480d2c | 18 | unsigned long flags = perf_event_open_cloexec_flag(); |
75562573 | 19 | int err = -EAGAIN, fd; |
46ec69ad | 20 | static pid_t pid = -1; |
75562573 | 21 | |
0f98b11c | 22 | evlist = evlist__new(); |
75562573 AH |
23 | if (!evlist) |
24 | return -ENOMEM; | |
25 | ||
b39b8393 | 26 | if (parse_events(evlist, str, NULL)) |
75562573 AH |
27 | goto out_delete; |
28 | ||
29 | evsel = perf_evlist__first(evlist); | |
30 | ||
46ec69ad | 31 | while (1) { |
1fc632ce | 32 | fd = sys_perf_event_open(&evsel->core.attr, pid, cpu, -1, flags); |
46ec69ad AH |
33 | if (fd < 0) { |
34 | if (pid == -1 && errno == EACCES) { | |
35 | pid = 0; | |
36 | continue; | |
37 | } | |
38 | goto out_delete; | |
39 | } | |
40 | break; | |
41 | } | |
75562573 AH |
42 | close(fd); |
43 | ||
44 | fn(evsel); | |
45 | ||
1fc632ce | 46 | fd = sys_perf_event_open(&evsel->core.attr, pid, cpu, -1, flags); |
75562573 AH |
47 | if (fd < 0) { |
48 | if (errno == EINVAL) | |
49 | err = -EINVAL; | |
50 | goto out_delete; | |
51 | } | |
52 | close(fd); | |
53 | err = 0; | |
54 | ||
55 | out_delete: | |
c12995a5 | 56 | evlist__delete(evlist); |
75562573 AH |
57 | return err; |
58 | } | |
59 | ||
60 | static bool perf_probe_api(setup_probe_fn_t fn) | |
61 | { | |
c6fa3565 | 62 | const char *try[] = {"cycles:u", "instructions:u", "cpu-clock:u", NULL}; |
f854839b | 63 | struct perf_cpu_map *cpus; |
75562573 AH |
64 | int cpu, ret, i = 0; |
65 | ||
66 | cpus = cpu_map__new(NULL); | |
67 | if (!cpus) | |
68 | return false; | |
69 | cpu = cpus->map[0]; | |
38f01d8d | 70 | perf_cpu_map__put(cpus); |
75562573 AH |
71 | |
72 | do { | |
73 | ret = perf_do_probe_api(fn, cpu, try[i++]); | |
74 | if (!ret) | |
75 | return true; | |
76 | } while (ret == -EAGAIN && try[i]); | |
77 | ||
78 | return false; | |
79 | } | |
80 | ||
32dcd021 | 81 | static void perf_probe_sample_identifier(struct evsel *evsel) |
75562573 | 82 | { |
1fc632ce | 83 | evsel->core.attr.sample_type |= PERF_SAMPLE_IDENTIFIER; |
75562573 AH |
84 | } |
85 | ||
32dcd021 | 86 | static void perf_probe_comm_exec(struct evsel *evsel) |
39e09d40 | 87 | { |
1fc632ce | 88 | evsel->core.attr.comm_exec = 1; |
39e09d40 AH |
89 | } |
90 | ||
32dcd021 | 91 | static void perf_probe_context_switch(struct evsel *evsel) |
b757bb09 | 92 | { |
1fc632ce | 93 | evsel->core.attr.context_switch = 1; |
b757bb09 AH |
94 | } |
95 | ||
75562573 AH |
96 | bool perf_can_sample_identifier(void) |
97 | { | |
98 | return perf_probe_api(perf_probe_sample_identifier); | |
99 | } | |
faf96706 | 100 | |
39e09d40 AH |
101 | static bool perf_can_comm_exec(void) |
102 | { | |
103 | return perf_probe_api(perf_probe_comm_exec); | |
104 | } | |
105 | ||
b757bb09 AH |
106 | bool perf_can_record_switch_events(void) |
107 | { | |
108 | return perf_probe_api(perf_probe_context_switch); | |
109 | } | |
110 | ||
83509565 AH |
111 | bool perf_can_record_cpu_wide(void) |
112 | { | |
113 | struct perf_event_attr attr = { | |
114 | .type = PERF_TYPE_SOFTWARE, | |
115 | .config = PERF_COUNT_SW_CPU_CLOCK, | |
116 | .exclude_kernel = 1, | |
117 | }; | |
f854839b | 118 | struct perf_cpu_map *cpus; |
83509565 AH |
119 | int cpu, fd; |
120 | ||
121 | cpus = cpu_map__new(NULL); | |
122 | if (!cpus) | |
123 | return false; | |
124 | cpu = cpus->map[0]; | |
38f01d8d | 125 | perf_cpu_map__put(cpus); |
83509565 AH |
126 | |
127 | fd = sys_perf_event_open(&attr, -1, cpu, -1, 0); | |
128 | if (fd < 0) | |
129 | return false; | |
130 | close(fd); | |
131 | ||
132 | return true; | |
133 | } | |
134 | ||
63503dba | 135 | void perf_evlist__config(struct evlist *evlist, struct record_opts *opts, |
e68ae9cf | 136 | struct callchain_param *callchain) |
faf96706 | 137 | { |
32dcd021 | 138 | struct evsel *evsel; |
75562573 | 139 | bool use_sample_identifier = false; |
39e09d40 | 140 | bool use_comm_exec; |
ad46e48c | 141 | bool sample_id = opts->sample_id; |
75562573 | 142 | |
faf96706 AH |
143 | /* |
144 | * Set the evsel leader links before we configure attributes, | |
145 | * since some might depend on this info. | |
146 | */ | |
147 | if (opts->group) | |
148 | perf_evlist__set_leader(evlist); | |
149 | ||
150 | if (evlist->cpus->map[0] < 0) | |
151 | opts->no_inherit = true; | |
152 | ||
39e09d40 AH |
153 | use_comm_exec = perf_can_comm_exec(); |
154 | ||
e5cadb93 | 155 | evlist__for_each_entry(evlist, evsel) { |
e68ae9cf | 156 | perf_evsel__config(evsel, opts, callchain); |
60b0896c | 157 | if (evsel->tracking && use_comm_exec) |
1fc632ce | 158 | evsel->core.attr.comm_exec = 1; |
39e09d40 | 159 | } |
faf96706 | 160 | |
9e0cc4fe AH |
161 | if (opts->full_auxtrace) { |
162 | /* | |
163 | * Need to be able to synthesize and parse selected events with | |
164 | * arbitrary sample types, which requires always being able to | |
165 | * match the id. | |
166 | */ | |
167 | use_sample_identifier = perf_can_sample_identifier(); | |
ad46e48c | 168 | sample_id = true; |
6484d2f9 | 169 | } else if (evlist->core.nr_entries > 1) { |
32dcd021 | 170 | struct evsel *first = perf_evlist__first(evlist); |
75562573 | 171 | |
e5cadb93 | 172 | evlist__for_each_entry(evlist, evsel) { |
1fc632ce | 173 | if (evsel->core.attr.sample_type == first->core.attr.sample_type) |
75562573 AH |
174 | continue; |
175 | use_sample_identifier = perf_can_sample_identifier(); | |
176 | break; | |
177 | } | |
ad46e48c JO |
178 | sample_id = true; |
179 | } | |
180 | ||
181 | if (sample_id) { | |
e5cadb93 | 182 | evlist__for_each_entry(evlist, evsel) |
75562573 | 183 | perf_evsel__set_sample_id(evsel, use_sample_identifier); |
faf96706 | 184 | } |
75562573 AH |
185 | |
186 | perf_evlist__set_id_pos(evlist); | |
faf96706 | 187 | } |
714647bd JO |
188 | |
189 | static int get_max_rate(unsigned int *rate) | |
190 | { | |
ce27309f | 191 | return sysctl__read_int("kernel/perf_event_max_sample_rate", (int *)rate); |
714647bd JO |
192 | } |
193 | ||
b4006796 | 194 | static int record_opts__config_freq(struct record_opts *opts) |
714647bd JO |
195 | { |
196 | bool user_freq = opts->user_freq != UINT_MAX; | |
197 | unsigned int max_rate; | |
198 | ||
199 | if (opts->user_interval != ULLONG_MAX) | |
200 | opts->default_interval = opts->user_interval; | |
201 | if (user_freq) | |
202 | opts->freq = opts->user_freq; | |
203 | ||
204 | /* | |
205 | * User specified count overrides default frequency. | |
206 | */ | |
207 | if (opts->default_interval) | |
208 | opts->freq = 0; | |
209 | else if (opts->freq) { | |
210 | opts->default_interval = opts->freq; | |
211 | } else { | |
212 | pr_err("frequency and count are zero, aborting\n"); | |
213 | return -1; | |
214 | } | |
215 | ||
216 | if (get_max_rate(&max_rate)) | |
217 | return 0; | |
218 | ||
219 | /* | |
220 | * User specified frequency is over current maximum. | |
221 | */ | |
222 | if (user_freq && (max_rate < opts->freq)) { | |
b09c2364 ACM |
223 | if (opts->strict_freq) { |
224 | pr_err("error: Maximum frequency rate (%'u Hz) exceeded.\n" | |
225 | " Please use -F freq option with a lower value or consider\n" | |
226 | " tweaking /proc/sys/kernel/perf_event_max_sample_rate.\n", | |
227 | max_rate); | |
228 | return -1; | |
229 | } else { | |
230 | pr_warning("warning: Maximum frequency rate (%'u Hz) exceeded, throttling from %'u Hz to %'u Hz.\n" | |
231 | " The limit can be raised via /proc/sys/kernel/perf_event_max_sample_rate.\n" | |
232 | " The kernel will lower it when perf's interrupts take too long.\n" | |
233 | " Use --strict-freq to disable this throttling, refusing to record.\n", | |
234 | max_rate, opts->freq, max_rate); | |
235 | ||
236 | opts->freq = max_rate; | |
237 | } | |
714647bd JO |
238 | } |
239 | ||
240 | /* | |
241 | * Default frequency is over current maximum. | |
242 | */ | |
243 | if (max_rate < opts->freq) { | |
244 | pr_warning("Lowering default frequency rate to %u.\n" | |
245 | "Please consider tweaking " | |
246 | "/proc/sys/kernel/perf_event_max_sample_rate.\n", | |
247 | max_rate); | |
248 | opts->freq = max_rate; | |
249 | } | |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
b4006796 | 254 | int record_opts__config(struct record_opts *opts) |
714647bd | 255 | { |
b4006796 | 256 | return record_opts__config_freq(opts); |
714647bd | 257 | } |
c09ec622 | 258 | |
63503dba | 259 | bool perf_evlist__can_select_event(struct evlist *evlist, const char *str) |
c09ec622 | 260 | { |
63503dba | 261 | struct evlist *temp_evlist; |
32dcd021 | 262 | struct evsel *evsel; |
c09ec622 AH |
263 | int err, fd, cpu; |
264 | bool ret = false; | |
46ec69ad | 265 | pid_t pid = -1; |
c09ec622 | 266 | |
0f98b11c | 267 | temp_evlist = evlist__new(); |
c09ec622 AH |
268 | if (!temp_evlist) |
269 | return false; | |
270 | ||
b39b8393 | 271 | err = parse_events(temp_evlist, str, NULL); |
c09ec622 AH |
272 | if (err) |
273 | goto out_delete; | |
274 | ||
275 | evsel = perf_evlist__last(temp_evlist); | |
276 | ||
277 | if (!evlist || cpu_map__empty(evlist->cpus)) { | |
f854839b | 278 | struct perf_cpu_map *cpus = cpu_map__new(NULL); |
c09ec622 AH |
279 | |
280 | cpu = cpus ? cpus->map[0] : 0; | |
38f01d8d | 281 | perf_cpu_map__put(cpus); |
c09ec622 AH |
282 | } else { |
283 | cpu = evlist->cpus->map[0]; | |
284 | } | |
285 | ||
46ec69ad | 286 | while (1) { |
1fc632ce | 287 | fd = sys_perf_event_open(&evsel->core.attr, pid, cpu, -1, |
46ec69ad AH |
288 | perf_event_open_cloexec_flag()); |
289 | if (fd < 0) { | |
290 | if (pid == -1 && errno == EACCES) { | |
291 | pid = 0; | |
292 | continue; | |
293 | } | |
294 | goto out_delete; | |
295 | } | |
296 | break; | |
c09ec622 | 297 | } |
46ec69ad AH |
298 | close(fd); |
299 | ret = true; | |
c09ec622 AH |
300 | |
301 | out_delete: | |
c12995a5 | 302 | evlist__delete(temp_evlist); |
c09ec622 AH |
303 | return ret; |
304 | } | |
67230479 ACM |
305 | |
306 | int record__parse_freq(const struct option *opt, const char *str, int unset __maybe_unused) | |
307 | { | |
308 | unsigned int freq; | |
309 | struct record_opts *opts = opt->value; | |
310 | ||
311 | if (!str) | |
312 | return -EINVAL; | |
313 | ||
314 | if (strcasecmp(str, "max") == 0) { | |
315 | if (get_max_rate(&freq)) { | |
316 | pr_err("couldn't read /proc/sys/kernel/perf_event_max_sample_rate\n"); | |
317 | return -1; | |
318 | } | |
319 | pr_info("info: Using a maximum frequency rate of %'d Hz\n", freq); | |
320 | } else { | |
321 | freq = atoi(str); | |
322 | } | |
323 | ||
324 | opts->user_freq = freq; | |
325 | return 0; | |
326 | } |