summaryrefslogtreecommitdiffstats
path: root/tools/perf/builtin-inject.c
blob: e29f04ed33963c0839b8d1c7e9d2fe1e310f4ea6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
/*
 * builtin-inject.c
 *
 * Builtin inject command: Examine the live mode (stdin) event stream
 * and repipe it to stdout while optionally injecting additional
 * events into it.
 */
#include "builtin.h"

#include "perf.h"
#include "util/session.h"
#include "util/debug.h"

#include "util/parse-options.h"

static char		const *input_name = "-";
static bool		inject_build_ids;

static int perf_event__repipe_synth(union perf_event *event,
				    struct perf_session *session __used)
{
	uint32_t size;
	void *buf = event;

	size = event->header.size;

	while (size) {
		int ret = write(STDOUT_FILENO, buf, size);
		if (ret < 0)
			return -errno;

		size -= ret;
		buf += ret;
	}

	return 0;
}

static int perf_event__repipe(union perf_event *event,
			      struct perf_sample *sample __used,
			      struct perf_session *session)
{
	return perf_event__repipe_synth(event, session);
}

static int perf_event__repipe_mmap(union perf_event *event,
				   struct perf_sample *sample,
				   struct perf_session *session)
{
	int err;

	err = perf_event__process_mmap(event, sample, session);
	perf_event__repipe(event, sample, session);

	return err;
}

static int perf_event__repipe_task(union perf_event *event,
				   struct perf_sample *sample,
				   struct perf_session *session)
{
	int err;

	err = perf_event__process_task(event, sample, session);
	perf_event__repipe(event, sample, session);

	return err;
}

static int perf_event__repipe_tracing_data(union perf_event *event,
					   struct perf_session *session)
{
	int err;

	perf_event__repipe_synth(event, session);
	err = perf_event__process_tracing_data(event, session);

	return err;
}

static int dso__read_build_id(struct dso *self)
{
	if (self->has_build_id)
		return 0;

	if (filename__read_build_id(self->long_name, self->build_id,
				    sizeof(self->build_id)) > 0) {
		self->has_build_id = true;
		return 0;
	}

	return -1;
}

static int dso__inject_build_id(struct dso *self, struct perf_session *session)
{
	u16 misc = PERF_RECORD_MISC_USER;
	struct machine *machine;
	int err;

	if (dso__read_build_id(self) < 0) {
		pr_debug("no build_id found for %s\n", self->long_name);
		return -1;
	}

	machine = perf_session__find_host_machine(session);
	if (machine == NULL) {
		pr_err("Can't find machine for session\n");
		return -1;
	}

	if (self->kernel)
		misc = PERF_RECORD_MISC_KERNEL;

	err = perf_event__synthesize_build_id(self, misc, perf_event__repipe,
					      machine, session);
	if (err) {
		pr_err("Can't synthesize build_id event for %s\n", self->long_name);
		return -1;
	}

	return 0;
}

static int perf_event__inject_buildid(union perf_event *event,
				      struct perf_sample *sample,
				      struct perf_session *session)
{
	struct addr_location al;
	struct thread *thread;
	u8 cpumode;

	cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;

	thread = perf_session__findnew(session, event->ip.pid);
	if (thread == NULL) {
		pr_err("problem processing %d event, skipping it.\n",
		       event->header.type);
		goto repipe;
	}

	thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
			      event->ip.pid, event->ip.ip, &al);

	if (al.map != NULL) {
		if (!al.map->dso->hit) {
			al.map->dso->hit = 1;
			if (map__load(al.map, NULL) >= 0) {
				dso__inject_build_id(al.map->dso, session);
				/*
				 * If this fails, too bad, let the other side
				 * account this as unresolved.
				 */
			} else
				pr_warning("no symbols found in %s, maybe "
					   "install a debug package?\n",
					   al.map->dso->long_name);
		}
	}

repipe:
	perf_event__repipe(event, sample, session);
	return 0;
}

struct perf_event_ops inject_ops = {
	.sample		= perf_event__repipe,
	.mmap		= perf_event__repipe,
	.comm		= perf_event__repipe,
	.fork		= perf_event__repipe,
	.exit		= perf_event__repipe,
	.lost		= perf_event__repipe,
	.read		= perf_event__repipe,
	.throttle	= perf_event__repipe,
	.unthrottle	= perf_event__repipe,
	.attr		= perf_event__repipe_synth,
	.event_type 	= perf_event__repipe_synth,
	.tracing_data 	= perf_event__repipe_synth,
	.build_id 	= perf_event__repipe_synth,
};

extern volatile int session_done;

static void sig_handler(int sig __attribute__((__unused__)))
{
	session_done = 1;
}

static int __cmd_inject(void)
{
	struct perf_session *session;
	int ret = -EINVAL;

	signal(SIGINT, sig_handler);

	if (inject_build_ids) {
		inject_ops.sample	= perf_event__inject_buildid;
		inject_ops.mmap		= perf_event__repipe_mmap;
		inject_ops.fork		= perf_event__repipe_task;
		inject_ops.tracing_data	= perf_event__repipe_tracing_data;
	}

	session = perf_session__new(input_name, O_RDONLY, false, true, &inject_ops);
	if (session == NULL)
		return -ENOMEM;

	ret = perf_session__process_events(session, &inject_ops);

	perf_session__delete(session);

	return ret;
}

static const char * const report_usage[] = {
	"perf inject [<options>]",
	NULL
};

static const struct option options[] = {
	OPT_BOOLEAN('b', "build-ids", &inject_build_ids,
		    "Inject build-ids into the output stream"),
	OPT_INCR('v', "verbose", &verbose,
		 "be more verbose (show build ids, etc)"),
	OPT_END()
};

int cmd_inject(int argc, const char **argv, const char *prefix __used)
{
	argc = parse_options(argc, argv, options, report_usage, 0);

	/*
	 * Any (unrecognized) arguments left?
	 */
	if (argc)
		usage_with_options(report_usage, options);

	if (symbol__init() < 0)
		return -1;

	return __cmd_inject();
}
OpenPOWER on IntegriCloud