Commit | Line | Data |
---|---|---|
faf96706 AH |
1 | #include "evlist.h" |
2 | #include "evsel.h" | |
3 | #include "cpumap.h" | |
75562573 | 4 | #include "parse-events.h" |
cd0cfad7 | 5 | #include <api/fs/fs.h> |
714647bd | 6 | #include "util.h" |
57480d2c | 7 | #include "cloexec.h" |
75562573 AH |
8 | |
9 | typedef void (*setup_probe_fn_t)(struct perf_evsel *evsel); | |
10 | ||
11 | static int perf_do_probe_api(setup_probe_fn_t fn, int cpu, const char *str) | |
12 | { | |
13 | struct perf_evlist *evlist; | |
14 | struct perf_evsel *evsel; | |
57480d2c | 15 | unsigned long flags = perf_event_open_cloexec_flag(); |
75562573 | 16 | int err = -EAGAIN, fd; |
46ec69ad | 17 | static pid_t pid = -1; |
75562573 AH |
18 | |
19 | evlist = perf_evlist__new(); | |
20 | if (!evlist) | |
21 | return -ENOMEM; | |
22 | ||
b39b8393 | 23 | if (parse_events(evlist, str, NULL)) |
75562573 AH |
24 | goto out_delete; |
25 | ||
26 | evsel = perf_evlist__first(evlist); | |
27 | ||
46ec69ad AH |
28 | while (1) { |
29 | fd = sys_perf_event_open(&evsel->attr, pid, cpu, -1, flags); | |
30 | if (fd < 0) { | |
31 | if (pid == -1 && errno == EACCES) { | |
32 | pid = 0; | |
33 | continue; | |
34 | } | |
35 | goto out_delete; | |
36 | } | |
37 | break; | |
38 | } | |
75562573 AH |
39 | close(fd); |
40 | ||
41 | fn(evsel); | |
42 | ||
46ec69ad | 43 | fd = sys_perf_event_open(&evsel->attr, pid, cpu, -1, flags); |
75562573 AH |
44 | if (fd < 0) { |
45 | if (errno == EINVAL) | |
46 | err = -EINVAL; | |
47 | goto out_delete; | |
48 | } | |
49 | close(fd); | |
50 | err = 0; | |
51 | ||
52 | out_delete: | |
53 | perf_evlist__delete(evlist); | |
54 | return err; | |
55 | } | |
56 | ||
57 | static bool perf_probe_api(setup_probe_fn_t fn) | |
58 | { | |
c6fa3565 | 59 | const char *try[] = {"cycles:u", "instructions:u", "cpu-clock:u", NULL}; |
75562573 AH |
60 | struct cpu_map *cpus; |
61 | int cpu, ret, i = 0; | |
62 | ||
63 | cpus = cpu_map__new(NULL); | |
64 | if (!cpus) | |
65 | return false; | |
66 | cpu = cpus->map[0]; | |
f30a79b0 | 67 | cpu_map__put(cpus); |
75562573 AH |
68 | |
69 | do { | |
70 | ret = perf_do_probe_api(fn, cpu, try[i++]); | |
71 | if (!ret) | |
72 | return true; | |
73 | } while (ret == -EAGAIN && try[i]); | |
74 | ||
75 | return false; | |
76 | } | |
77 | ||
78 | static void perf_probe_sample_identifier(struct perf_evsel *evsel) | |
79 | { | |
80 | evsel->attr.sample_type |= PERF_SAMPLE_IDENTIFIER; | |
81 | } | |
82 | ||
39e09d40 AH |
83 | static void perf_probe_comm_exec(struct perf_evsel *evsel) |
84 | { | |
85 | evsel->attr.comm_exec = 1; | |
86 | } | |
87 | ||
b757bb09 AH |
88 | static void perf_probe_context_switch(struct perf_evsel *evsel) |
89 | { | |
90 | evsel->attr.context_switch = 1; | |
91 | } | |
92 | ||
75562573 AH |
93 | bool perf_can_sample_identifier(void) |
94 | { | |
95 | return perf_probe_api(perf_probe_sample_identifier); | |
96 | } | |
faf96706 | 97 | |
39e09d40 AH |
98 | static bool perf_can_comm_exec(void) |
99 | { | |
100 | return perf_probe_api(perf_probe_comm_exec); | |
101 | } | |
102 | ||
b757bb09 AH |
103 | bool perf_can_record_switch_events(void) |
104 | { | |
105 | return perf_probe_api(perf_probe_context_switch); | |
106 | } | |
107 | ||
83509565 AH |
108 | bool perf_can_record_cpu_wide(void) |
109 | { | |
110 | struct perf_event_attr attr = { | |
111 | .type = PERF_TYPE_SOFTWARE, | |
112 | .config = PERF_COUNT_SW_CPU_CLOCK, | |
113 | .exclude_kernel = 1, | |
114 | }; | |
115 | struct cpu_map *cpus; | |
116 | int cpu, fd; | |
117 | ||
118 | cpus = cpu_map__new(NULL); | |
119 | if (!cpus) | |
120 | return false; | |
121 | cpu = cpus->map[0]; | |
122 | cpu_map__put(cpus); | |
123 | ||
124 | fd = sys_perf_event_open(&attr, -1, cpu, -1, 0); | |
125 | if (fd < 0) | |
126 | return false; | |
127 | close(fd); | |
128 | ||
129 | return true; | |
130 | } | |
131 | ||
e68ae9cf ACM |
132 | void perf_evlist__config(struct perf_evlist *evlist, struct record_opts *opts, |
133 | struct callchain_param *callchain) | |
faf96706 AH |
134 | { |
135 | struct perf_evsel *evsel; | |
75562573 | 136 | bool use_sample_identifier = false; |
39e09d40 | 137 | bool use_comm_exec; |
75562573 | 138 | |
faf96706 AH |
139 | /* |
140 | * Set the evsel leader links before we configure attributes, | |
141 | * since some might depend on this info. | |
142 | */ | |
143 | if (opts->group) | |
144 | perf_evlist__set_leader(evlist); | |
145 | ||
146 | if (evlist->cpus->map[0] < 0) | |
147 | opts->no_inherit = true; | |
148 | ||
39e09d40 AH |
149 | use_comm_exec = perf_can_comm_exec(); |
150 | ||
e5cadb93 | 151 | evlist__for_each_entry(evlist, evsel) { |
e68ae9cf | 152 | perf_evsel__config(evsel, opts, callchain); |
60b0896c | 153 | if (evsel->tracking && use_comm_exec) |
39e09d40 AH |
154 | evsel->attr.comm_exec = 1; |
155 | } | |
faf96706 | 156 | |
9e0cc4fe AH |
157 | if (opts->full_auxtrace) { |
158 | /* | |
159 | * Need to be able to synthesize and parse selected events with | |
160 | * arbitrary sample types, which requires always being able to | |
161 | * match the id. | |
162 | */ | |
163 | use_sample_identifier = perf_can_sample_identifier(); | |
e5cadb93 | 164 | evlist__for_each_entry(evlist, evsel) |
9e0cc4fe AH |
165 | perf_evsel__set_sample_id(evsel, use_sample_identifier); |
166 | } else if (evlist->nr_entries > 1) { | |
75562573 AH |
167 | struct perf_evsel *first = perf_evlist__first(evlist); |
168 | ||
e5cadb93 | 169 | evlist__for_each_entry(evlist, evsel) { |
75562573 AH |
170 | if (evsel->attr.sample_type == first->attr.sample_type) |
171 | continue; | |
172 | use_sample_identifier = perf_can_sample_identifier(); | |
173 | break; | |
174 | } | |
e5cadb93 | 175 | evlist__for_each_entry(evlist, evsel) |
75562573 | 176 | perf_evsel__set_sample_id(evsel, use_sample_identifier); |
faf96706 | 177 | } |
75562573 AH |
178 | |
179 | perf_evlist__set_id_pos(evlist); | |
faf96706 | 180 | } |
714647bd JO |
181 | |
182 | static int get_max_rate(unsigned int *rate) | |
183 | { | |
ce27309f | 184 | return sysctl__read_int("kernel/perf_event_max_sample_rate", (int *)rate); |
714647bd JO |
185 | } |
186 | ||
b4006796 | 187 | static int record_opts__config_freq(struct record_opts *opts) |
714647bd JO |
188 | { |
189 | bool user_freq = opts->user_freq != UINT_MAX; | |
190 | unsigned int max_rate; | |
191 | ||
192 | if (opts->user_interval != ULLONG_MAX) | |
193 | opts->default_interval = opts->user_interval; | |
194 | if (user_freq) | |
195 | opts->freq = opts->user_freq; | |
196 | ||
197 | /* | |
198 | * User specified count overrides default frequency. | |
199 | */ | |
200 | if (opts->default_interval) | |
201 | opts->freq = 0; | |
202 | else if (opts->freq) { | |
203 | opts->default_interval = opts->freq; | |
204 | } else { | |
205 | pr_err("frequency and count are zero, aborting\n"); | |
206 | return -1; | |
207 | } | |
208 | ||
209 | if (get_max_rate(&max_rate)) | |
210 | return 0; | |
211 | ||
212 | /* | |
213 | * User specified frequency is over current maximum. | |
214 | */ | |
215 | if (user_freq && (max_rate < opts->freq)) { | |
216 | pr_err("Maximum frequency rate (%u) reached.\n" | |
217 | "Please use -F freq option with lower value or consider\n" | |
218 | "tweaking /proc/sys/kernel/perf_event_max_sample_rate.\n", | |
219 | max_rate); | |
220 | return -1; | |
221 | } | |
222 | ||
223 | /* | |
224 | * Default frequency is over current maximum. | |
225 | */ | |
226 | if (max_rate < opts->freq) { | |
227 | pr_warning("Lowering default frequency rate to %u.\n" | |
228 | "Please consider tweaking " | |
229 | "/proc/sys/kernel/perf_event_max_sample_rate.\n", | |
230 | max_rate); | |
231 | opts->freq = max_rate; | |
232 | } | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
b4006796 | 237 | int record_opts__config(struct record_opts *opts) |
714647bd | 238 | { |
b4006796 | 239 | return record_opts__config_freq(opts); |
714647bd | 240 | } |
c09ec622 AH |
241 | |
242 | bool perf_evlist__can_select_event(struct perf_evlist *evlist, const char *str) | |
243 | { | |
244 | struct perf_evlist *temp_evlist; | |
245 | struct perf_evsel *evsel; | |
246 | int err, fd, cpu; | |
247 | bool ret = false; | |
46ec69ad | 248 | pid_t pid = -1; |
c09ec622 AH |
249 | |
250 | temp_evlist = perf_evlist__new(); | |
251 | if (!temp_evlist) | |
252 | return false; | |
253 | ||
b39b8393 | 254 | err = parse_events(temp_evlist, str, NULL); |
c09ec622 AH |
255 | if (err) |
256 | goto out_delete; | |
257 | ||
258 | evsel = perf_evlist__last(temp_evlist); | |
259 | ||
260 | if (!evlist || cpu_map__empty(evlist->cpus)) { | |
261 | struct cpu_map *cpus = cpu_map__new(NULL); | |
262 | ||
263 | cpu = cpus ? cpus->map[0] : 0; | |
f30a79b0 | 264 | cpu_map__put(cpus); |
c09ec622 AH |
265 | } else { |
266 | cpu = evlist->cpus->map[0]; | |
267 | } | |
268 | ||
46ec69ad AH |
269 | while (1) { |
270 | fd = sys_perf_event_open(&evsel->attr, pid, cpu, -1, | |
271 | perf_event_open_cloexec_flag()); | |
272 | if (fd < 0) { | |
273 | if (pid == -1 && errno == EACCES) { | |
274 | pid = 0; | |
275 | continue; | |
276 | } | |
277 | goto out_delete; | |
278 | } | |
279 | break; | |
c09ec622 | 280 | } |
46ec69ad AH |
281 | close(fd); |
282 | ret = true; | |
c09ec622 AH |
283 | |
284 | out_delete: | |
285 | perf_evlist__delete(temp_evlist); | |
286 | return ret; | |
287 | } |