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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/tools/perf/util/record.c
..
..
@@ -1,141 +1,98 @@
1
1
 // SPDX-License-Identifier: GPL-2.0
2
+#include "debug.h"
2
3
 #include "evlist.h"
3
4
 #include "evsel.h"
4
-#include "cpumap.h"
5
+#include "evsel_config.h"
5
6
 #include "parse-events.h"
6
7
 #include <errno.h>
8
+#include <limits.h>
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+#include <stdlib.h>
7
10
 #include <api/fs/fs.h>
8
11
 #include <subcmd/parse-options.h>
9
-#include "util.h"
12
+#include <perf/cpumap.h>
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13
 #include "cloexec.h"
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+#include "util/perf_api_probe.h"
15
+#include "record.h"
16
+#include "../perf-sys.h"
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+#include "topdown.h"
11
18
 
12
-typedef void (*setup_probe_fn_t)(struct perf_evsel *evsel);
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-
14
-static int perf_do_probe_api(setup_probe_fn_t fn, int cpu, const char *str)
19
+/*
20
+ * evsel__config_leader_sampling() uses special rules for leader sampling.
21
+ * However, if the leader is an AUX area event, then assume the event to sample
22
+ * is the next event.
23
+ */
24
+static struct evsel *evsel__read_sampler(struct evsel *evsel, struct evlist *evlist)
15
25
 {
16
-	struct perf_evlist *evlist;
17
-	struct perf_evsel *evsel;
18
-	unsigned long flags = perf_event_open_cloexec_flag();
19
-	int err = -EAGAIN, fd;
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-	static pid_t pid = -1;
26
+	struct evsel *leader = evsel->leader;
21
27
 
22
-	evlist = perf_evlist__new();
23
-	if (!evlist)
24
-		return -ENOMEM;
25
-
26
-	if (parse_events(evlist, str, NULL))
27
-		goto out_delete;
28
-
29
-	evsel = perf_evlist__first(evlist);
30
-
31
-	while (1) {
32
-		fd = sys_perf_event_open(&evsel->attr, pid, cpu, -1, flags);
33
-		if (fd < 0) {
34
-			if (pid == -1 && errno == EACCES) {
35
-				pid = 0;
36
-				continue;
37
-			}
38
-			goto out_delete;
28
+	if (evsel__is_aux_event(leader) || arch_topdown_sample_read(leader)) {
29
+		evlist__for_each_entry(evlist, evsel) {
30
+			if (evsel->leader == leader && evsel != evsel->leader)
31
+				return evsel;
39
32
 		}
40
-		break;
41
33
 	}
42
-	close(fd);
43
34
 
44
-	fn(evsel);
35
+	return leader;
36
+}
45
37
 
46
-	fd = sys_perf_event_open(&evsel->attr, pid, cpu, -1, flags);
47
-	if (fd < 0) {
48
-		if (errno == EINVAL)
49
-			err = -EINVAL;
50
-		goto out_delete;
38
+static u64 evsel__config_term_mask(struct evsel *evsel)
39
+{
40
+	struct evsel_config_term *term;
41
+	struct list_head *config_terms = &evsel->config_terms;
42
+	u64 term_types = 0;
43
+
44
+	list_for_each_entry(term, config_terms, list) {
45
+		term_types |= 1 << term->type;
51
46
 	}
52
-	close(fd);
53
-	err = 0;
54
-
55
-out_delete:
56
-	perf_evlist__delete(evlist);
57
-	return err;
47
+	return term_types;
58
48
 }
59
49
 
60
-static bool perf_probe_api(setup_probe_fn_t fn)
50
+static void evsel__config_leader_sampling(struct evsel *evsel, struct evlist *evlist)
61
51
 {
62
-	const char *try[] = {"cycles:u", "instructions:u", "cpu-clock:u", NULL};
63
-	struct cpu_map *cpus;
64
-	int cpu, ret, i = 0;
52
+	struct perf_event_attr *attr = &evsel->core.attr;
53
+	struct evsel *leader = evsel->leader;
54
+	struct evsel *read_sampler;
55
+	u64 term_types, freq_mask;
65
56
 
66
-	cpus = cpu_map__new(NULL);
67
-	if (!cpus)
68
-		return false;
69
-	cpu = cpus->map[0];
70
-	cpu_map__put(cpus);
57
+	if (!leader->sample_read)
58
+		return;
71
59
 
72
-	do {
73
-		ret = perf_do_probe_api(fn, cpu, try[i++]);
74
-		if (!ret)
75
-			return true;
76
-	} while (ret == -EAGAIN && try[i]);
60
+	read_sampler = evsel__read_sampler(evsel, evlist);
77
61
 
78
-	return false;
62
+	if (evsel == read_sampler)
63
+		return;
64
+
65
+	term_types = evsel__config_term_mask(evsel);
66
+	/*
67
+	 * Disable sampling for all group members except those with explicit
68
+	 * config terms or the leader. In the case of an AUX area event, the 2nd
69
+	 * event in the group is the one that 'leads' the sampling.
70
+	 */
71
+	freq_mask = (1 << EVSEL__CONFIG_TERM_FREQ) | (1 << EVSEL__CONFIG_TERM_PERIOD);
72
+	if ((term_types & freq_mask) == 0) {
73
+		attr->freq           = 0;
74
+		attr->sample_freq    = 0;
75
+		attr->sample_period  = 0;
76
+	}
77
+	if ((term_types & (1 << EVSEL__CONFIG_TERM_OVERWRITE)) == 0)
78
+		attr->write_backward = 0;
79
+
80
+	/*
81
+	 * We don't get a sample for slave events, we make them when delivering
82
+	 * the group leader sample. Set the slave event to follow the master
83
+	 * sample_type to ease up reporting.
84
+	 * An AUX area event also has sample_type requirements, so also include
85
+	 * the sample type bits from the leader's sample_type to cover that
86
+	 * case.
87
+	 */
88
+	attr->sample_type = read_sampler->core.attr.sample_type |
89
+			    leader->core.attr.sample_type;
79
90
 }
80
91
 
81
-static void perf_probe_sample_identifier(struct perf_evsel *evsel)
82
-{
83
-	evsel->attr.sample_type |= PERF_SAMPLE_IDENTIFIER;
84
-}
85
-
86
-static void perf_probe_comm_exec(struct perf_evsel *evsel)
87
-{
88
-	evsel->attr.comm_exec = 1;
89
-}
90
-
91
-static void perf_probe_context_switch(struct perf_evsel *evsel)
92
-{
93
-	evsel->attr.context_switch = 1;
94
-}
95
-
96
-bool perf_can_sample_identifier(void)
97
-{
98
-	return perf_probe_api(perf_probe_sample_identifier);
99
-}
100
-
101
-static bool perf_can_comm_exec(void)
102
-{
103
-	return perf_probe_api(perf_probe_comm_exec);
104
-}
105
-
106
-bool perf_can_record_switch_events(void)
107
-{
108
-	return perf_probe_api(perf_probe_context_switch);
109
-}
110
-
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
-	};
118
-	struct cpu_map *cpus;
119
-	int cpu, fd;
120
-
121
-	cpus = cpu_map__new(NULL);
122
-	if (!cpus)
123
-		return false;
124
-	cpu = cpus->map[0];
125
-	cpu_map__put(cpus);
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
-
135
-void perf_evlist__config(struct perf_evlist *evlist, struct record_opts *opts,
92
+void perf_evlist__config(struct evlist *evlist, struct record_opts *opts,
136
93
 			 struct callchain_param *callchain)
137
94
 {
138
-	struct perf_evsel *evsel;
95
+	struct evsel *evsel;
139
96
 	bool use_sample_identifier = false;
140
97
 	bool use_comm_exec;
141
98
 	bool sample_id = opts->sample_id;
..
..
@@ -147,16 +104,20 @@
147
104
 	if (opts->group)
148
105
 		perf_evlist__set_leader(evlist);
149
106
 
150
-	if (evlist->cpus->map[0] < 0)
107
+	if (evlist->core.cpus->map[0] < 0)
151
108
 		opts->no_inherit = true;
152
109
 
153
110
 	use_comm_exec = perf_can_comm_exec();
154
111
 
155
112
 	evlist__for_each_entry(evlist, evsel) {
156
-		perf_evsel__config(evsel, opts, callchain);
113
+		evsel__config(evsel, opts, callchain);
157
114
 		if (evsel->tracking && use_comm_exec)
158
-			evsel->attr.comm_exec = 1;
115
+			evsel->core.attr.comm_exec = 1;
159
116
 	}
117
+
118
+	/* Configure leader sampling here now that the sample type is known */
119
+	evlist__for_each_entry(evlist, evsel)
120
+		evsel__config_leader_sampling(evsel, evlist);
160
121
 
161
122
 	if (opts->full_auxtrace) {
162
123
 		/*
..
..
@@ -166,11 +127,11 @@
166
127
 		 */
167
128
 		use_sample_identifier = perf_can_sample_identifier();
168
129
 		sample_id = true;
169
-	} else if (evlist->nr_entries > 1) {
170
-		struct perf_evsel *first = perf_evlist__first(evlist);
130
+	} else if (evlist->core.nr_entries > 1) {
131
+		struct evsel *first = evlist__first(evlist);
171
132
 
172
133
 		evlist__for_each_entry(evlist, evsel) {
173
-			if (evsel->attr.sample_type == first->attr.sample_type)
134
+			if (evsel->core.attr.sample_type == first->core.attr.sample_type)
174
135
 				continue;
175
136
 			use_sample_identifier = perf_can_sample_identifier();
176
137
 			break;
..
..
@@ -180,7 +141,7 @@
180
141
 
181
142
 	if (sample_id) {
182
143
 		evlist__for_each_entry(evlist, evsel)
183
-			perf_evsel__set_sample_id(evsel, use_sample_identifier);
144
+			evsel__set_sample_id(evsel, use_sample_identifier);
184
145
 	}
185
146
 
186
147
 	perf_evlist__set_id_pos(evlist);
..
..
@@ -256,15 +217,15 @@
256
217
 	return record_opts__config_freq(opts);
257
218
 }
258
219
 
259
-bool perf_evlist__can_select_event(struct perf_evlist *evlist, const char *str)
220
+bool perf_evlist__can_select_event(struct evlist *evlist, const char *str)
260
221
 {
261
-	struct perf_evlist *temp_evlist;
262
-	struct perf_evsel *evsel;
222
+	struct evlist *temp_evlist;
223
+	struct evsel *evsel;
263
224
 	int err, fd, cpu;
264
225
 	bool ret = false;
265
226
 	pid_t pid = -1;
266
227
 
267
-	temp_evlist = perf_evlist__new();
228
+	temp_evlist = evlist__new();
268
229
 	if (!temp_evlist)
269
230
 		return false;
270
231
 
..
..
@@ -272,19 +233,19 @@
272
233
 	if (err)
273
234
 		goto out_delete;
274
235
 
275
-	evsel = perf_evlist__last(temp_evlist);
236
+	evsel = evlist__last(temp_evlist);
276
237
 
277
-	if (!evlist || cpu_map__empty(evlist->cpus)) {
278
-		struct cpu_map *cpus = cpu_map__new(NULL);
238
+	if (!evlist || perf_cpu_map__empty(evlist->core.cpus)) {
239
+		struct perf_cpu_map *cpus = perf_cpu_map__new(NULL);
279
240
 
280
241
 		cpu =  cpus ? cpus->map[0] : 0;
281
-		cpu_map__put(cpus);
242
+		perf_cpu_map__put(cpus);
282
243
 	} else {
283
-		cpu = evlist->cpus->map[0];
244
+		cpu = evlist->core.cpus->map[0];
284
245
 	}
285
246
 
286
247
 	while (1) {
287
-		fd = sys_perf_event_open(&evsel->attr, pid, cpu, -1,
248
+		fd = sys_perf_event_open(&evsel->core.attr, pid, cpu, -1,
288
249
 					 perf_event_open_cloexec_flag());
289
250
 		if (fd < 0) {
290
251
 			if (pid == -1 && errno == EACCES) {
..
..
@@ -299,7 +260,7 @@
299
260
 	ret = true;
300
261
 
301
262
 out_delete:
302
-	perf_evlist__delete(temp_evlist);
263
+	evlist__delete(temp_evlist);
303
264
 	return ret;
304
265
 }
305
266