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Commit | Line | Data |
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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 AH |
16 | int err = -EAGAIN, fd; |
17 | ||
18 | evlist = perf_evlist__new(); | |
19 | if (!evlist) | |
20 | return -ENOMEM; | |
21 | ||
22 | if (parse_events(evlist, str)) | |
23 | goto out_delete; | |
24 | ||
25 | evsel = perf_evlist__first(evlist); | |
26 | ||
57480d2c | 27 | fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, flags); |
75562573 AH |
28 | if (fd < 0) |
29 | goto out_delete; | |
30 | close(fd); | |
31 | ||
32 | fn(evsel); | |
33 | ||
57480d2c | 34 | fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, flags); |
75562573 AH |
35 | if (fd < 0) { |
36 | if (errno == EINVAL) | |
37 | err = -EINVAL; | |
38 | goto out_delete; | |
39 | } | |
40 | close(fd); | |
41 | err = 0; | |
42 | ||
43 | out_delete: | |
44 | perf_evlist__delete(evlist); | |
45 | return err; | |
46 | } | |
47 | ||
48 | static bool perf_probe_api(setup_probe_fn_t fn) | |
49 | { | |
50 | const char *try[] = {"cycles:u", "instructions:u", "cpu-clock", NULL}; | |
51 | struct cpu_map *cpus; | |
52 | int cpu, ret, i = 0; | |
53 | ||
54 | cpus = cpu_map__new(NULL); | |
55 | if (!cpus) | |
56 | return false; | |
57 | cpu = cpus->map[0]; | |
58 | cpu_map__delete(cpus); | |
59 | ||
60 | do { | |
61 | ret = perf_do_probe_api(fn, cpu, try[i++]); | |
62 | if (!ret) | |
63 | return true; | |
64 | } while (ret == -EAGAIN && try[i]); | |
65 | ||
66 | return false; | |
67 | } | |
68 | ||
69 | static void perf_probe_sample_identifier(struct perf_evsel *evsel) | |
70 | { | |
71 | evsel->attr.sample_type |= PERF_SAMPLE_IDENTIFIER; | |
72 | } | |
73 | ||
39e09d40 AH |
74 | static void perf_probe_comm_exec(struct perf_evsel *evsel) |
75 | { | |
76 | evsel->attr.comm_exec = 1; | |
77 | } | |
78 | ||
75562573 AH |
79 | bool perf_can_sample_identifier(void) |
80 | { | |
81 | return perf_probe_api(perf_probe_sample_identifier); | |
82 | } | |
faf96706 | 83 | |
39e09d40 AH |
84 | static bool perf_can_comm_exec(void) |
85 | { | |
86 | return perf_probe_api(perf_probe_comm_exec); | |
87 | } | |
88 | ||
b4006796 | 89 | void perf_evlist__config(struct perf_evlist *evlist, struct record_opts *opts) |
faf96706 AH |
90 | { |
91 | struct perf_evsel *evsel; | |
75562573 | 92 | bool use_sample_identifier = false; |
39e09d40 | 93 | bool use_comm_exec; |
75562573 | 94 | |
faf96706 AH |
95 | /* |
96 | * Set the evsel leader links before we configure attributes, | |
97 | * since some might depend on this info. | |
98 | */ | |
99 | if (opts->group) | |
100 | perf_evlist__set_leader(evlist); | |
101 | ||
102 | if (evlist->cpus->map[0] < 0) | |
103 | opts->no_inherit = true; | |
104 | ||
39e09d40 AH |
105 | use_comm_exec = perf_can_comm_exec(); |
106 | ||
107 | evlist__for_each(evlist, evsel) { | |
faf96706 | 108 | perf_evsel__config(evsel, opts); |
39e09d40 AH |
109 | if (!evsel->idx && use_comm_exec) |
110 | evsel->attr.comm_exec = 1; | |
111 | } | |
faf96706 | 112 | |
75562573 AH |
113 | if (evlist->nr_entries > 1) { |
114 | struct perf_evsel *first = perf_evlist__first(evlist); | |
115 | ||
0050f7aa | 116 | evlist__for_each(evlist, evsel) { |
75562573 AH |
117 | if (evsel->attr.sample_type == first->attr.sample_type) |
118 | continue; | |
119 | use_sample_identifier = perf_can_sample_identifier(); | |
120 | break; | |
121 | } | |
0050f7aa | 122 | evlist__for_each(evlist, evsel) |
75562573 | 123 | perf_evsel__set_sample_id(evsel, use_sample_identifier); |
faf96706 | 124 | } |
75562573 AH |
125 | |
126 | perf_evlist__set_id_pos(evlist); | |
faf96706 | 127 | } |
714647bd JO |
128 | |
129 | static int get_max_rate(unsigned int *rate) | |
130 | { | |
131 | char path[PATH_MAX]; | |
132 | const char *procfs = procfs__mountpoint(); | |
133 | ||
134 | if (!procfs) | |
135 | return -1; | |
136 | ||
137 | snprintf(path, PATH_MAX, | |
138 | "%s/sys/kernel/perf_event_max_sample_rate", procfs); | |
139 | ||
140 | return filename__read_int(path, (int *) rate); | |
141 | } | |
142 | ||
b4006796 | 143 | static int record_opts__config_freq(struct record_opts *opts) |
714647bd JO |
144 | { |
145 | bool user_freq = opts->user_freq != UINT_MAX; | |
146 | unsigned int max_rate; | |
147 | ||
148 | if (opts->user_interval != ULLONG_MAX) | |
149 | opts->default_interval = opts->user_interval; | |
150 | if (user_freq) | |
151 | opts->freq = opts->user_freq; | |
152 | ||
153 | /* | |
154 | * User specified count overrides default frequency. | |
155 | */ | |
156 | if (opts->default_interval) | |
157 | opts->freq = 0; | |
158 | else if (opts->freq) { | |
159 | opts->default_interval = opts->freq; | |
160 | } else { | |
161 | pr_err("frequency and count are zero, aborting\n"); | |
162 | return -1; | |
163 | } | |
164 | ||
165 | if (get_max_rate(&max_rate)) | |
166 | return 0; | |
167 | ||
168 | /* | |
169 | * User specified frequency is over current maximum. | |
170 | */ | |
171 | if (user_freq && (max_rate < opts->freq)) { | |
172 | pr_err("Maximum frequency rate (%u) reached.\n" | |
173 | "Please use -F freq option with lower value or consider\n" | |
174 | "tweaking /proc/sys/kernel/perf_event_max_sample_rate.\n", | |
175 | max_rate); | |
176 | return -1; | |
177 | } | |
178 | ||
179 | /* | |
180 | * Default frequency is over current maximum. | |
181 | */ | |
182 | if (max_rate < opts->freq) { | |
183 | pr_warning("Lowering default frequency rate to %u.\n" | |
184 | "Please consider tweaking " | |
185 | "/proc/sys/kernel/perf_event_max_sample_rate.\n", | |
186 | max_rate); | |
187 | opts->freq = max_rate; | |
188 | } | |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
b4006796 | 193 | int record_opts__config(struct record_opts *opts) |
714647bd | 194 | { |
b4006796 | 195 | return record_opts__config_freq(opts); |
714647bd | 196 | } |
c09ec622 AH |
197 | |
198 | bool perf_evlist__can_select_event(struct perf_evlist *evlist, const char *str) | |
199 | { | |
200 | struct perf_evlist *temp_evlist; | |
201 | struct perf_evsel *evsel; | |
202 | int err, fd, cpu; | |
203 | bool ret = false; | |
204 | ||
205 | temp_evlist = perf_evlist__new(); | |
206 | if (!temp_evlist) | |
207 | return false; | |
208 | ||
209 | err = parse_events(temp_evlist, str); | |
210 | if (err) | |
211 | goto out_delete; | |
212 | ||
213 | evsel = perf_evlist__last(temp_evlist); | |
214 | ||
215 | if (!evlist || cpu_map__empty(evlist->cpus)) { | |
216 | struct cpu_map *cpus = cpu_map__new(NULL); | |
217 | ||
218 | cpu = cpus ? cpus->map[0] : 0; | |
219 | cpu_map__delete(cpus); | |
220 | } else { | |
221 | cpu = evlist->cpus->map[0]; | |
222 | } | |
223 | ||
57480d2c YD |
224 | fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, |
225 | perf_event_open_cloexec_flag()); | |
c09ec622 AH |
226 | if (fd >= 0) { |
227 | close(fd); | |
228 | ret = true; | |
229 | } | |
230 | ||
231 | out_delete: | |
232 | perf_evlist__delete(temp_evlist); | |
233 | return ret; | |
234 | } |