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1 | #include "evlist.h" | |
2 | #include "evsel.h" | |
3 | #include "cpumap.h" | |
4 | #include "parse-events.h" | |
5 | #include <api/fs/fs.h> | |
6 | #include "util.h" | |
7 | ||
8 | typedef void (*setup_probe_fn_t)(struct perf_evsel *evsel); | |
9 | ||
10 | static int perf_do_probe_api(setup_probe_fn_t fn, int cpu, const char *str) | |
11 | { | |
12 | struct perf_evlist *evlist; | |
13 | struct perf_evsel *evsel; | |
14 | int err = -EAGAIN, fd; | |
15 | ||
16 | evlist = perf_evlist__new(); | |
17 | if (!evlist) | |
18 | return -ENOMEM; | |
19 | ||
20 | if (parse_events(evlist, str)) | |
21 | goto out_delete; | |
22 | ||
23 | evsel = perf_evlist__first(evlist); | |
24 | ||
25 | fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0); | |
26 | if (fd < 0) | |
27 | goto out_delete; | |
28 | close(fd); | |
29 | ||
30 | fn(evsel); | |
31 | ||
32 | fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0); | |
33 | if (fd < 0) { | |
34 | if (errno == EINVAL) | |
35 | err = -EINVAL; | |
36 | goto out_delete; | |
37 | } | |
38 | close(fd); | |
39 | err = 0; | |
40 | ||
41 | out_delete: | |
42 | perf_evlist__delete(evlist); | |
43 | return err; | |
44 | } | |
45 | ||
46 | static bool perf_probe_api(setup_probe_fn_t fn) | |
47 | { | |
48 | const char *try[] = {"cycles:u", "instructions:u", "cpu-clock", NULL}; | |
49 | struct cpu_map *cpus; | |
50 | int cpu, ret, i = 0; | |
51 | ||
52 | cpus = cpu_map__new(NULL); | |
53 | if (!cpus) | |
54 | return false; | |
55 | cpu = cpus->map[0]; | |
56 | cpu_map__delete(cpus); | |
57 | ||
58 | do { | |
59 | ret = perf_do_probe_api(fn, cpu, try[i++]); | |
60 | if (!ret) | |
61 | return true; | |
62 | } while (ret == -EAGAIN && try[i]); | |
63 | ||
64 | return false; | |
65 | } | |
66 | ||
67 | static void perf_probe_sample_identifier(struct perf_evsel *evsel) | |
68 | { | |
69 | evsel->attr.sample_type |= PERF_SAMPLE_IDENTIFIER; | |
70 | } | |
71 | ||
72 | bool perf_can_sample_identifier(void) | |
73 | { | |
74 | return perf_probe_api(perf_probe_sample_identifier); | |
75 | } | |
76 | ||
77 | void perf_evlist__config(struct perf_evlist *evlist, struct record_opts *opts) | |
78 | { | |
79 | struct perf_evsel *evsel; | |
80 | bool use_sample_identifier = false; | |
81 | ||
82 | /* | |
83 | * Set the evsel leader links before we configure attributes, | |
84 | * since some might depend on this info. | |
85 | */ | |
86 | if (opts->group) | |
87 | perf_evlist__set_leader(evlist); | |
88 | ||
89 | if (evlist->cpus->map[0] < 0) | |
90 | opts->no_inherit = true; | |
91 | ||
92 | evlist__for_each(evlist, evsel) | |
93 | perf_evsel__config(evsel, opts); | |
94 | ||
95 | if (evlist->nr_entries > 1) { | |
96 | struct perf_evsel *first = perf_evlist__first(evlist); | |
97 | ||
98 | evlist__for_each(evlist, evsel) { | |
99 | if (evsel->attr.sample_type == first->attr.sample_type) | |
100 | continue; | |
101 | use_sample_identifier = perf_can_sample_identifier(); | |
102 | break; | |
103 | } | |
104 | evlist__for_each(evlist, evsel) | |
105 | perf_evsel__set_sample_id(evsel, use_sample_identifier); | |
106 | } | |
107 | ||
108 | perf_evlist__set_id_pos(evlist); | |
109 | } | |
110 | ||
111 | static int get_max_rate(unsigned int *rate) | |
112 | { | |
113 | char path[PATH_MAX]; | |
114 | const char *procfs = procfs__mountpoint(); | |
115 | ||
116 | if (!procfs) | |
117 | return -1; | |
118 | ||
119 | snprintf(path, PATH_MAX, | |
120 | "%s/sys/kernel/perf_event_max_sample_rate", procfs); | |
121 | ||
122 | return filename__read_int(path, (int *) rate); | |
123 | } | |
124 | ||
125 | static int record_opts__config_freq(struct record_opts *opts) | |
126 | { | |
127 | bool user_freq = opts->user_freq != UINT_MAX; | |
128 | unsigned int max_rate; | |
129 | ||
130 | if (opts->user_interval != ULLONG_MAX) | |
131 | opts->default_interval = opts->user_interval; | |
132 | if (user_freq) | |
133 | opts->freq = opts->user_freq; | |
134 | ||
135 | /* | |
136 | * User specified count overrides default frequency. | |
137 | */ | |
138 | if (opts->default_interval) | |
139 | opts->freq = 0; | |
140 | else if (opts->freq) { | |
141 | opts->default_interval = opts->freq; | |
142 | } else { | |
143 | pr_err("frequency and count are zero, aborting\n"); | |
144 | return -1; | |
145 | } | |
146 | ||
147 | if (get_max_rate(&max_rate)) | |
148 | return 0; | |
149 | ||
150 | /* | |
151 | * User specified frequency is over current maximum. | |
152 | */ | |
153 | if (user_freq && (max_rate < opts->freq)) { | |
154 | pr_err("Maximum frequency rate (%u) reached.\n" | |
155 | "Please use -F freq option with lower value or consider\n" | |
156 | "tweaking /proc/sys/kernel/perf_event_max_sample_rate.\n", | |
157 | max_rate); | |
158 | return -1; | |
159 | } | |
160 | ||
161 | /* | |
162 | * Default frequency is over current maximum. | |
163 | */ | |
164 | if (max_rate < opts->freq) { | |
165 | pr_warning("Lowering default frequency rate to %u.\n" | |
166 | "Please consider tweaking " | |
167 | "/proc/sys/kernel/perf_event_max_sample_rate.\n", | |
168 | max_rate); | |
169 | opts->freq = max_rate; | |
170 | } | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
175 | int record_opts__config(struct record_opts *opts) | |
176 | { | |
177 | return record_opts__config_freq(opts); | |
178 | } | |
179 | ||
180 | bool perf_evlist__can_select_event(struct perf_evlist *evlist, const char *str) | |
181 | { | |
182 | struct perf_evlist *temp_evlist; | |
183 | struct perf_evsel *evsel; | |
184 | int err, fd, cpu; | |
185 | bool ret = false; | |
186 | ||
187 | temp_evlist = perf_evlist__new(); | |
188 | if (!temp_evlist) | |
189 | return false; | |
190 | ||
191 | err = parse_events(temp_evlist, str); | |
192 | if (err) | |
193 | goto out_delete; | |
194 | ||
195 | evsel = perf_evlist__last(temp_evlist); | |
196 | ||
197 | if (!evlist || cpu_map__empty(evlist->cpus)) { | |
198 | struct cpu_map *cpus = cpu_map__new(NULL); | |
199 | ||
200 | cpu = cpus ? cpus->map[0] : 0; | |
201 | cpu_map__delete(cpus); | |
202 | } else { | |
203 | cpu = evlist->cpus->map[0]; | |
204 | } | |
205 | ||
206 | fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0); | |
207 | if (fd >= 0) { | |
208 | close(fd); | |
209 | ret = true; | |
210 | } | |
211 | ||
212 | out_delete: | |
213 | perf_evlist__delete(temp_evlist); | |
214 | return ret; | |
215 | } |