1 /*
2 * Copyright (C) 2009, Steven Rostedt <srostedt@redhat.com>
3 *
4 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 of the License (not later!)
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
20 */
21 #include <dirent.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <stdarg.h>
26 #include <sys/types.h>
27 #include <sys/stat.h>
28 #include <sys/wait.h>
29 #include <sys/mman.h>
30 #include <pthread.h>
31 #include <fcntl.h>
32 #include <unistd.h>
33 #include <errno.h>
34
35 #include "../perf.h"
36 #include "util.h"
37 #include "trace-event.h"
38 #include "debug.h"
39
40 static int input_fd;
41
42 static ssize_t trace_data_size;
43 static bool repipe;
44
__do_read(int fd,void * buf,int size)45 static int __do_read(int fd, void *buf, int size)
46 {
47 int rsize = size;
48
49 while (size) {
50 int ret = read(fd, buf, size);
51
52 if (ret <= 0)
53 return -1;
54
55 if (repipe) {
56 int retw = write(STDOUT_FILENO, buf, ret);
57
58 if (retw <= 0 || retw != ret) {
59 pr_debug("repiping input file");
60 return -1;
61 }
62 }
63
64 size -= ret;
65 buf += ret;
66 }
67
68 return rsize;
69 }
70
do_read(void * data,int size)71 static int do_read(void *data, int size)
72 {
73 int r;
74
75 r = __do_read(input_fd, data, size);
76 if (r <= 0) {
77 pr_debug("reading input file (size expected=%d received=%d)",
78 size, r);
79 return -1;
80 }
81
82 trace_data_size += r;
83
84 return r;
85 }
86
87 /* If it fails, the next read will report it */
skip(int size)88 static void skip(int size)
89 {
90 char buf[BUFSIZ];
91 int r;
92
93 while (size) {
94 r = size > BUFSIZ ? BUFSIZ : size;
95 do_read(buf, r);
96 size -= r;
97 };
98 }
99
read4(struct pevent * pevent)100 static unsigned int read4(struct pevent *pevent)
101 {
102 unsigned int data;
103
104 if (do_read(&data, 4) < 0)
105 return 0;
106 return __data2host4(pevent, data);
107 }
108
read8(struct pevent * pevent)109 static unsigned long long read8(struct pevent *pevent)
110 {
111 unsigned long long data;
112
113 if (do_read(&data, 8) < 0)
114 return 0;
115 return __data2host8(pevent, data);
116 }
117
read_string(void)118 static char *read_string(void)
119 {
120 char buf[BUFSIZ];
121 char *str = NULL;
122 int size = 0;
123 off_t r;
124 char c;
125
126 for (;;) {
127 r = read(input_fd, &c, 1);
128 if (r < 0) {
129 pr_debug("reading input file");
130 goto out;
131 }
132
133 if (!r) {
134 pr_debug("no data");
135 goto out;
136 }
137
138 if (repipe) {
139 int retw = write(STDOUT_FILENO, &c, 1);
140
141 if (retw <= 0 || retw != r) {
142 pr_debug("repiping input file string");
143 goto out;
144 }
145 }
146
147 buf[size++] = c;
148
149 if (!c)
150 break;
151 }
152
153 trace_data_size += size;
154
155 str = malloc(size);
156 if (str)
157 memcpy(str, buf, size);
158 out:
159 return str;
160 }
161
read_proc_kallsyms(struct pevent * pevent)162 static int read_proc_kallsyms(struct pevent *pevent)
163 {
164 unsigned int size;
165
166 size = read4(pevent);
167 if (!size)
168 return 0;
169 /*
170 * Just skip it, now that we configure libtraceevent to use the
171 * tools/perf/ symbol resolver.
172 *
173 * We need to skip it so that we can continue parsing old perf.data
174 * files, that contains this /proc/kallsyms payload.
175 *
176 * Newer perf.data files will have just the 4-bytes zeros "kallsyms
177 * payload", so that older tools can continue reading it and interpret
178 * it as "no kallsyms payload is present".
179 */
180 lseek(input_fd, size, SEEK_CUR);
181 trace_data_size += size;
182 return 0;
183 }
184
read_ftrace_printk(struct pevent * pevent)185 static int read_ftrace_printk(struct pevent *pevent)
186 {
187 unsigned int size;
188 char *buf;
189
190 /* it can have 0 size */
191 size = read4(pevent);
192 if (!size)
193 return 0;
194
195 buf = malloc(size);
196 if (buf == NULL)
197 return -1;
198
199 if (do_read(buf, size) < 0) {
200 free(buf);
201 return -1;
202 }
203
204 parse_ftrace_printk(pevent, buf, size);
205
206 free(buf);
207 return 0;
208 }
209
read_header_files(struct pevent * pevent)210 static int read_header_files(struct pevent *pevent)
211 {
212 unsigned long long size;
213 char *header_page;
214 char buf[BUFSIZ];
215 int ret = 0;
216
217 if (do_read(buf, 12) < 0)
218 return -1;
219
220 if (memcmp(buf, "header_page", 12) != 0) {
221 pr_debug("did not read header page");
222 return -1;
223 }
224
225 size = read8(pevent);
226
227 header_page = malloc(size);
228 if (header_page == NULL)
229 return -1;
230
231 if (do_read(header_page, size) < 0) {
232 pr_debug("did not read header page");
233 free(header_page);
234 return -1;
235 }
236
237 if (!pevent_parse_header_page(pevent, header_page, size,
238 pevent_get_long_size(pevent))) {
239 /*
240 * The commit field in the page is of type long,
241 * use that instead, since it represents the kernel.
242 */
243 pevent_set_long_size(pevent, pevent->header_page_size_size);
244 }
245 free(header_page);
246
247 if (do_read(buf, 13) < 0)
248 return -1;
249
250 if (memcmp(buf, "header_event", 13) != 0) {
251 pr_debug("did not read header event");
252 return -1;
253 }
254
255 size = read8(pevent);
256 skip(size);
257
258 return ret;
259 }
260
read_ftrace_file(struct pevent * pevent,unsigned long long size)261 static int read_ftrace_file(struct pevent *pevent, unsigned long long size)
262 {
263 char *buf;
264
265 buf = malloc(size);
266 if (buf == NULL)
267 return -1;
268
269 if (do_read(buf, size) < 0) {
270 free(buf);
271 return -1;
272 }
273
274 parse_ftrace_file(pevent, buf, size);
275 free(buf);
276 return 0;
277 }
278
read_event_file(struct pevent * pevent,char * sys,unsigned long long size)279 static int read_event_file(struct pevent *pevent, char *sys,
280 unsigned long long size)
281 {
282 char *buf;
283
284 buf = malloc(size);
285 if (buf == NULL)
286 return -1;
287
288 if (do_read(buf, size) < 0) {
289 free(buf);
290 return -1;
291 }
292
293 parse_event_file(pevent, buf, size, sys);
294 free(buf);
295 return 0;
296 }
297
read_ftrace_files(struct pevent * pevent)298 static int read_ftrace_files(struct pevent *pevent)
299 {
300 unsigned long long size;
301 int count;
302 int i;
303 int ret;
304
305 count = read4(pevent);
306
307 for (i = 0; i < count; i++) {
308 size = read8(pevent);
309 ret = read_ftrace_file(pevent, size);
310 if (ret)
311 return ret;
312 }
313 return 0;
314 }
315
read_event_files(struct pevent * pevent)316 static int read_event_files(struct pevent *pevent)
317 {
318 unsigned long long size;
319 char *sys;
320 int systems;
321 int count;
322 int i,x;
323 int ret;
324
325 systems = read4(pevent);
326
327 for (i = 0; i < systems; i++) {
328 sys = read_string();
329 if (sys == NULL)
330 return -1;
331
332 count = read4(pevent);
333
334 for (x=0; x < count; x++) {
335 size = read8(pevent);
336 ret = read_event_file(pevent, sys, size);
337 if (ret) {
338 free(sys);
339 return ret;
340 }
341 }
342 free(sys);
343 }
344 return 0;
345 }
346
trace_report(int fd,struct trace_event * tevent,bool __repipe)347 ssize_t trace_report(int fd, struct trace_event *tevent, bool __repipe)
348 {
349 char buf[BUFSIZ];
350 char test[] = { 23, 8, 68 };
351 char *version;
352 int show_version = 0;
353 int show_funcs = 0;
354 int show_printk = 0;
355 ssize_t size = -1;
356 int file_bigendian;
357 int host_bigendian;
358 int file_long_size;
359 int file_page_size;
360 struct pevent *pevent = NULL;
361 int err;
362
363 repipe = __repipe;
364 input_fd = fd;
365
366 if (do_read(buf, 3) < 0)
367 return -1;
368 if (memcmp(buf, test, 3) != 0) {
369 pr_debug("no trace data in the file");
370 return -1;
371 }
372
373 if (do_read(buf, 7) < 0)
374 return -1;
375 if (memcmp(buf, "tracing", 7) != 0) {
376 pr_debug("not a trace file (missing 'tracing' tag)");
377 return -1;
378 }
379
380 version = read_string();
381 if (version == NULL)
382 return -1;
383 if (show_version)
384 printf("version = %s\n", version);
385 free(version);
386
387 if (do_read(buf, 1) < 0)
388 return -1;
389 file_bigendian = buf[0];
390 host_bigendian = bigendian();
391
392 if (trace_event__init(tevent)) {
393 pr_debug("trace_event__init failed");
394 goto out;
395 }
396
397 pevent = tevent->pevent;
398
399 pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
400 pevent_set_file_bigendian(pevent, file_bigendian);
401 pevent_set_host_bigendian(pevent, host_bigendian);
402
403 if (do_read(buf, 1) < 0)
404 goto out;
405 file_long_size = buf[0];
406
407 file_page_size = read4(pevent);
408 if (!file_page_size)
409 goto out;
410
411 pevent_set_long_size(pevent, file_long_size);
412 pevent_set_page_size(pevent, file_page_size);
413
414 err = read_header_files(pevent);
415 if (err)
416 goto out;
417 err = read_ftrace_files(pevent);
418 if (err)
419 goto out;
420 err = read_event_files(pevent);
421 if (err)
422 goto out;
423 err = read_proc_kallsyms(pevent);
424 if (err)
425 goto out;
426 err = read_ftrace_printk(pevent);
427 if (err)
428 goto out;
429
430 size = trace_data_size;
431 repipe = false;
432
433 if (show_funcs) {
434 pevent_print_funcs(pevent);
435 } else if (show_printk) {
436 pevent_print_printk(pevent);
437 }
438
439 pevent = NULL;
440
441 out:
442 if (pevent)
443 trace_event__cleanup(tevent);
444 return size;
445 }
446