summaryrefslogtreecommitdiffstats
path: root/tools/perf/util/trace-event-read.c
blob: 40b425949aa31d7b4b334fa5923436f57dd2c842 (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
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
/*
 * Copyright (C) 2009, Steven Rostedt <srostedt@redhat.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License (not later!)
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */
#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>

#include "../perf.h"
#include "util.h"
#include "trace-event.h"
#include "debug.h"

static int input_fd;

static ssize_t trace_data_size;
static bool repipe;

static int __do_read(int fd, void *buf, int size)
{
	int rsize = size;

	while (size) {
		int ret = read(fd, buf, size);

		if (ret <= 0)
			return -1;

		if (repipe) {
			int retw = write(STDOUT_FILENO, buf, ret);

			if (retw <= 0 || retw != ret) {
				pr_debug("repiping input file");
				return -1;
			}
		}

		size -= ret;
		buf += ret;
	}

	return rsize;
}

static int do_read(void *data, int size)
{
	int r;

	r = __do_read(input_fd, data, size);
	if (r <= 0) {
		pr_debug("reading input file (size expected=%d received=%d)",
			 size, r);
		return -1;
	}

	trace_data_size += r;

	return r;
}

/* If it fails, the next read will report it */
static void skip(int size)
{
	char buf[BUFSIZ];
	int r;

	while (size) {
		r = size > BUFSIZ ? BUFSIZ : size;
		do_read(buf, r);
		size -= r;
	};
}

static unsigned int read4(struct pevent *pevent)
{
	unsigned int data;

	if (do_read(&data, 4) < 0)
		return 0;
	return __data2host4(pevent, data);
}

static unsigned long long read8(struct pevent *pevent)
{
	unsigned long long data;

	if (do_read(&data, 8) < 0)
		return 0;
	return __data2host8(pevent, data);
}

static char *read_string(void)
{
	char buf[BUFSIZ];
	char *str = NULL;
	int size = 0;
	off_t r;
	char c;

	for (;;) {
		r = read(input_fd, &c, 1);
		if (r < 0) {
			pr_debug("reading input file");
			goto out;
		}

		if (!r) {
			pr_debug("no data");
			goto out;
		}

		if (repipe) {
			int retw = write(STDOUT_FILENO, &c, 1);

			if (retw <= 0 || retw != r) {
				pr_debug("repiping input file string");
				goto out;
			}
		}

		buf[size++] = c;

		if (!c)
			break;
	}

	trace_data_size += size;

	str = malloc(size);
	if (str)
		memcpy(str, buf, size);
out:
	return str;
}

static int read_proc_kallsyms(struct pevent *pevent)
{
	unsigned int size;

	size = read4(pevent);
	if (!size)
		return 0;
	/*
	 * Just skip it, now that we configure libtraceevent to use the
	 * tools/perf/ symbol resolver.
	 *
	 * We need to skip it so that we can continue parsing old perf.data
	 * files, that contains this /proc/kallsyms payload.
	 *
	 * Newer perf.data files will have just the 4-bytes zeros "kallsyms
	 * payload", so that older tools can continue reading it and interpret
	 * it as "no kallsyms payload is present".
	 */
	lseek(input_fd, size, SEEK_CUR);
	trace_data_size += size;
	return 0;
}

static int read_ftrace_printk(struct pevent *pevent)
{
	unsigned int size;
	char *buf;

	/* it can have 0 size */
	size = read4(pevent);
	if (!size)
		return 0;

	buf = malloc(size + 1);
	if (buf == NULL)
		return -1;

	if (do_read(buf, size) < 0) {
		free(buf);
		return -1;
	}

	buf[size] = '\0';

	parse_ftrace_printk(pevent, buf, size);

	free(buf);
	return 0;
}

static int read_header_files(struct pevent *pevent)
{
	unsigned long long size;
	char *header_page;
	char buf[BUFSIZ];
	int ret = 0;

	if (do_read(buf, 12) < 0)
		return -1;

	if (memcmp(buf, "header_page", 12) != 0) {
		pr_debug("did not read header page");
		return -1;
	}

	size = read8(pevent);

	header_page = malloc(size);
	if (header_page == NULL)
		return -1;

	if (do_read(header_page, size) < 0) {
		pr_debug("did not read header page");
		free(header_page);
		return -1;
	}

	if (!pevent_parse_header_page(pevent, header_page, size,
				      pevent_get_long_size(pevent))) {
		/*
		 * The commit field in the page is of type long,
		 * use that instead, since it represents the kernel.
		 */
		pevent_set_long_size(pevent, pevent->header_page_size_size);
	}
	free(header_page);

	if (do_read(buf, 13) < 0)
		return -1;

	if (memcmp(buf, "header_event", 13) != 0) {
		pr_debug("did not read header event");
		return -1;
	}

	size = read8(pevent);
	skip(size);

	return ret;
}

static int read_ftrace_file(struct pevent *pevent, unsigned long long size)
{
	int ret;
	char *buf;

	buf = malloc(size);
	if (buf == NULL) {
		pr_debug("memory allocation failure\n");
		return -1;
	}

	ret = do_read(buf, size);
	if (ret < 0) {
		pr_debug("error reading ftrace file.\n");
		goto out;
	}

	ret = parse_ftrace_file(pevent, buf, size);
	if (ret < 0)
		pr_debug("error parsing ftrace file.\n");
out:
	free(buf);
	return ret;
}

static int read_event_file(struct pevent *pevent, char *sys,
			    unsigned long long size)
{
	int ret;
	char *buf;

	buf = malloc(size);
	if (buf == NULL) {
		pr_debug("memory allocation failure\n");
		return -1;
	}

	ret = do_read(buf, size);
	if (ret < 0) {
		free(buf);
		goto out;
	}

	ret = parse_event_file(pevent, buf, size, sys);
	if (ret < 0)
		pr_debug("error parsing event file.\n");
out:
	free(buf);
	return ret;
}

static int read_ftrace_files(struct pevent *pevent)
{
	unsigned long long size;
	int count;
	int i;
	int ret;

	count = read4(pevent);

	for (i = 0; i < count; i++) {
		size = read8(pevent);
		ret = read_ftrace_file(pevent, size);
		if (ret)
			return ret;
	}
	return 0;
}

static int read_event_files(struct pevent *pevent)
{
	unsigned long long size;
	char *sys;
	int systems;
	int count;
	int i,x;
	int ret;

	systems = read4(pevent);

	for (i = 0; i < systems; i++) {
		sys = read_string();
		if (sys == NULL)
			return -1;

		count = read4(pevent);

		for (x=0; x < count; x++) {
			size = read8(pevent);
			ret = read_event_file(pevent, sys, size);
			if (ret)
				return ret;
		}
	}
	return 0;
}

static int read_saved_cmdline(struct pevent *pevent)
{
	unsigned long long size;
	char *buf;
	int ret;

	/* it can have 0 size */
	size = read8(pevent);
	if (!size)
		return 0;

	buf = malloc(size + 1);
	if (buf == NULL) {
		pr_debug("memory allocation failure\n");
		return -1;
	}

	ret = do_read(buf, size);
	if (ret < 0) {
		pr_debug("error reading saved cmdlines\n");
		goto out;
	}

	parse_saved_cmdline(pevent, buf, size);
	ret = 0;
out:
	free(buf);
	return ret;
}

ssize_t trace_report(int fd, struct trace_event *tevent, bool __repipe)
{
	char buf[BUFSIZ];
	char test[] = { 23, 8, 68 };
	char *version;
	int show_version = 0;
	int show_funcs = 0;
	int show_printk = 0;
	ssize_t size = -1;
	int file_bigendian;
	int host_bigendian;
	int file_long_size;
	int file_page_size;
	struct pevent *pevent = NULL;
	int err;

	repipe = __repipe;
	input_fd = fd;

	if (do_read(buf, 3) < 0)
		return -1;
	if (memcmp(buf, test, 3) != 0) {
		pr_debug("no trace data in the file");
		return -1;
	}

	if (do_read(buf, 7) < 0)
		return -1;
	if (memcmp(buf, "tracing", 7) != 0) {
		pr_debug("not a trace file (missing 'tracing' tag)");
		return -1;
	}

	version = read_string();
	if (version == NULL)
		return -1;
	if (show_version)
		printf("version = %s\n", version);

	if (do_read(buf, 1) < 0) {
		free(version);
		return -1;
	}
	file_bigendian = buf[0];
	host_bigendian = bigendian();

	if (trace_event__init(tevent)) {
		pr_debug("trace_event__init failed");
		goto out;
	}

	pevent = tevent->pevent;

	pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
	pevent_set_file_bigendian(pevent, file_bigendian);
	pevent_set_host_bigendian(pevent, host_bigendian);

	if (do_read(buf, 1) < 0)
		goto out;
	file_long_size = buf[0];

	file_page_size = read4(pevent);
	if (!file_page_size)
		goto out;

	pevent_set_long_size(pevent, file_long_size);
	pevent_set_page_size(pevent, file_page_size);

	err = read_header_files(pevent);
	if (err)
		goto out;
	err = read_ftrace_files(pevent);
	if (err)
		goto out;
	err = read_event_files(pevent);
	if (err)
		goto out;
	err = read_proc_kallsyms(pevent);
	if (err)
		goto out;
	err = read_ftrace_printk(pevent);
	if (err)
		goto out;
	if (atof(version) >= 0.6) {
		err = read_saved_cmdline(pevent);
		if (err)
			goto out;
	}

	size = trace_data_size;
	repipe = false;

	if (show_funcs) {
		pevent_print_funcs(pevent);
	} else if (show_printk) {
		pevent_print_printk(pevent);
	}

	pevent = NULL;

out:
	if (pevent)
		trace_event__cleanup(tevent);
	free(version);
	return size;
}
OpenPOWER on IntegriCloud