perf annotate browser: Allow toggling the visualization of source code lines
[linux-2.6/linux-mips.git] / tools / perf / util / trace-event-read.c
blobf55cc3a765a12ab55dba204e11e7edb26bcfd0b6
1 /*
2 * Copyright (C) 2009, Steven Rostedt <srostedt@redhat.com>
4 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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!)
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.
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
19 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
21 #define _FILE_OFFSET_BITS 64
23 #include <dirent.h>
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <getopt.h>
28 #include <stdarg.h>
29 #include <sys/types.h>
30 #include <sys/stat.h>
31 #include <sys/wait.h>
32 #include <sys/mman.h>
33 #include <pthread.h>
34 #include <fcntl.h>
35 #include <unistd.h>
36 #include <ctype.h>
37 #include <errno.h>
39 #include "../perf.h"
40 #include "util.h"
41 #include "trace-event.h"
43 static int input_fd;
45 static int read_page;
47 int file_bigendian;
48 int host_bigendian;
49 static int long_size;
51 static unsigned long page_size;
53 static ssize_t calc_data_size;
54 static bool repipe;
56 static int do_read(int fd, void *buf, int size)
58 int rsize = size;
60 while (size) {
61 int ret = read(fd, buf, size);
63 if (ret <= 0)
64 return -1;
66 if (repipe) {
67 int retw = write(STDOUT_FILENO, buf, ret);
69 if (retw <= 0 || retw != ret)
70 die("repiping input file");
73 size -= ret;
74 buf += ret;
77 return rsize;
80 static int read_or_die(void *data, int size)
82 int r;
84 r = do_read(input_fd, data, size);
85 if (r <= 0)
86 die("reading input file (size expected=%d received=%d)",
87 size, r);
89 if (calc_data_size)
90 calc_data_size += r;
92 return r;
95 /* If it fails, the next read will report it */
96 static void skip(int size)
98 char buf[BUFSIZ];
99 int r;
101 while (size) {
102 r = size > BUFSIZ ? BUFSIZ : size;
103 read_or_die(buf, r);
104 size -= r;
108 static unsigned int read4(void)
110 unsigned int data;
112 read_or_die(&data, 4);
113 return __data2host4(data);
116 static unsigned long long read8(void)
118 unsigned long long data;
120 read_or_die(&data, 8);
121 return __data2host8(data);
124 static char *read_string(void)
126 char buf[BUFSIZ];
127 char *str = NULL;
128 int size = 0;
129 off_t r;
130 char c;
132 for (;;) {
133 r = read(input_fd, &c, 1);
134 if (r < 0)
135 die("reading input file");
137 if (!r)
138 die("no data");
140 if (repipe) {
141 int retw = write(STDOUT_FILENO, &c, 1);
143 if (retw <= 0 || retw != r)
144 die("repiping input file string");
147 buf[size++] = c;
149 if (!c)
150 break;
153 if (calc_data_size)
154 calc_data_size += size;
156 str = malloc_or_die(size);
157 memcpy(str, buf, size);
159 return str;
162 static void read_proc_kallsyms(void)
164 unsigned int size;
165 char *buf;
167 size = read4();
168 if (!size)
169 return;
171 buf = malloc_or_die(size + 1);
172 read_or_die(buf, size);
173 buf[size] = '\0';
175 parse_proc_kallsyms(buf, size);
177 free(buf);
180 static void read_ftrace_printk(void)
182 unsigned int size;
183 char *buf;
185 size = read4();
186 if (!size)
187 return;
189 buf = malloc_or_die(size);
190 read_or_die(buf, size);
192 parse_ftrace_printk(buf, size);
194 free(buf);
197 static void read_header_files(void)
199 unsigned long long size;
200 char *header_event;
201 char buf[BUFSIZ];
203 read_or_die(buf, 12);
205 if (memcmp(buf, "header_page", 12) != 0)
206 die("did not read header page");
208 size = read8();
209 skip(size);
212 * The size field in the page is of type long,
213 * use that instead, since it represents the kernel.
215 long_size = header_page_size_size;
217 read_or_die(buf, 13);
218 if (memcmp(buf, "header_event", 13) != 0)
219 die("did not read header event");
221 size = read8();
222 header_event = malloc_or_die(size);
223 read_or_die(header_event, size);
224 free(header_event);
227 static void read_ftrace_file(unsigned long long size)
229 char *buf;
231 buf = malloc_or_die(size);
232 read_or_die(buf, size);
233 parse_ftrace_file(buf, size);
234 free(buf);
237 static void read_event_file(char *sys, unsigned long long size)
239 char *buf;
241 buf = malloc_or_die(size);
242 read_or_die(buf, size);
243 parse_event_file(buf, size, sys);
244 free(buf);
247 static void read_ftrace_files(void)
249 unsigned long long size;
250 int count;
251 int i;
253 count = read4();
255 for (i = 0; i < count; i++) {
256 size = read8();
257 read_ftrace_file(size);
261 static void read_event_files(void)
263 unsigned long long size;
264 char *sys;
265 int systems;
266 int count;
267 int i,x;
269 systems = read4();
271 for (i = 0; i < systems; i++) {
272 sys = read_string();
274 count = read4();
275 for (x=0; x < count; x++) {
276 size = read8();
277 read_event_file(sys, size);
282 struct cpu_data {
283 unsigned long long offset;
284 unsigned long long size;
285 unsigned long long timestamp;
286 struct record *next;
287 char *page;
288 int cpu;
289 int index;
290 int page_size;
293 static struct cpu_data *cpu_data;
295 static void update_cpu_data_index(int cpu)
297 cpu_data[cpu].offset += page_size;
298 cpu_data[cpu].size -= page_size;
299 cpu_data[cpu].index = 0;
302 static void get_next_page(int cpu)
304 off_t save_seek;
305 off_t ret;
307 if (!cpu_data[cpu].page)
308 return;
310 if (read_page) {
311 if (cpu_data[cpu].size <= page_size) {
312 free(cpu_data[cpu].page);
313 cpu_data[cpu].page = NULL;
314 return;
317 update_cpu_data_index(cpu);
319 /* other parts of the code may expect the pointer to not move */
320 save_seek = lseek(input_fd, 0, SEEK_CUR);
322 ret = lseek(input_fd, cpu_data[cpu].offset, SEEK_SET);
323 if (ret == (off_t)-1)
324 die("failed to lseek");
325 ret = read(input_fd, cpu_data[cpu].page, page_size);
326 if (ret < 0)
327 die("failed to read page");
329 /* reset the file pointer back */
330 lseek(input_fd, save_seek, SEEK_SET);
332 return;
335 munmap(cpu_data[cpu].page, page_size);
336 cpu_data[cpu].page = NULL;
338 if (cpu_data[cpu].size <= page_size)
339 return;
341 update_cpu_data_index(cpu);
343 cpu_data[cpu].page = mmap(NULL, page_size, PROT_READ, MAP_PRIVATE,
344 input_fd, cpu_data[cpu].offset);
345 if (cpu_data[cpu].page == MAP_FAILED)
346 die("failed to mmap cpu %d at offset 0x%llx",
347 cpu, cpu_data[cpu].offset);
350 static unsigned int type_len4host(unsigned int type_len_ts)
352 if (file_bigendian)
353 return (type_len_ts >> 27) & ((1 << 5) - 1);
354 else
355 return type_len_ts & ((1 << 5) - 1);
358 static unsigned int ts4host(unsigned int type_len_ts)
360 if (file_bigendian)
361 return type_len_ts & ((1 << 27) - 1);
362 else
363 return type_len_ts >> 5;
366 static int calc_index(void *ptr, int cpu)
368 return (unsigned long)ptr - (unsigned long)cpu_data[cpu].page;
371 struct record *trace_peek_data(int cpu)
373 struct record *data;
374 void *page = cpu_data[cpu].page;
375 int idx = cpu_data[cpu].index;
376 void *ptr = page + idx;
377 unsigned long long extend;
378 unsigned int type_len_ts;
379 unsigned int type_len;
380 unsigned int delta;
381 unsigned int length = 0;
383 if (cpu_data[cpu].next)
384 return cpu_data[cpu].next;
386 if (!page)
387 return NULL;
389 if (!idx) {
390 /* FIXME: handle header page */
391 if (header_page_ts_size != 8)
392 die("expected a long long type for timestamp");
393 cpu_data[cpu].timestamp = data2host8(ptr);
394 ptr += 8;
395 switch (header_page_size_size) {
396 case 4:
397 cpu_data[cpu].page_size = data2host4(ptr);
398 ptr += 4;
399 break;
400 case 8:
401 cpu_data[cpu].page_size = data2host8(ptr);
402 ptr += 8;
403 break;
404 default:
405 die("bad long size");
407 ptr = cpu_data[cpu].page + header_page_data_offset;
410 read_again:
411 idx = calc_index(ptr, cpu);
413 if (idx >= cpu_data[cpu].page_size) {
414 get_next_page(cpu);
415 return trace_peek_data(cpu);
418 type_len_ts = data2host4(ptr);
419 ptr += 4;
421 type_len = type_len4host(type_len_ts);
422 delta = ts4host(type_len_ts);
424 switch (type_len) {
425 case RINGBUF_TYPE_PADDING:
426 if (!delta)
427 die("error, hit unexpected end of page");
428 length = data2host4(ptr);
429 ptr += 4;
430 length *= 4;
431 ptr += length;
432 goto read_again;
434 case RINGBUF_TYPE_TIME_EXTEND:
435 extend = data2host4(ptr);
436 ptr += 4;
437 extend <<= TS_SHIFT;
438 extend += delta;
439 cpu_data[cpu].timestamp += extend;
440 goto read_again;
442 case RINGBUF_TYPE_TIME_STAMP:
443 ptr += 12;
444 break;
445 case 0:
446 length = data2host4(ptr);
447 ptr += 4;
448 die("here! length=%d", length);
449 break;
450 default:
451 length = type_len * 4;
452 break;
455 cpu_data[cpu].timestamp += delta;
457 data = malloc_or_die(sizeof(*data));
458 memset(data, 0, sizeof(*data));
460 data->ts = cpu_data[cpu].timestamp;
461 data->size = length;
462 data->data = ptr;
463 ptr += length;
465 cpu_data[cpu].index = calc_index(ptr, cpu);
466 cpu_data[cpu].next = data;
468 return data;
471 struct record *trace_read_data(int cpu)
473 struct record *data;
475 data = trace_peek_data(cpu);
476 cpu_data[cpu].next = NULL;
478 return data;
481 ssize_t trace_report(int fd, bool __repipe)
483 char buf[BUFSIZ];
484 char test[] = { 23, 8, 68 };
485 char *version;
486 int show_version = 0;
487 int show_funcs = 0;
488 int show_printk = 0;
489 ssize_t size;
491 calc_data_size = 1;
492 repipe = __repipe;
494 input_fd = fd;
496 read_or_die(buf, 3);
497 if (memcmp(buf, test, 3) != 0)
498 die("no trace data in the file");
500 read_or_die(buf, 7);
501 if (memcmp(buf, "tracing", 7) != 0)
502 die("not a trace file (missing 'tracing' tag)");
504 version = read_string();
505 if (show_version)
506 printf("version = %s\n", version);
507 free(version);
509 read_or_die(buf, 1);
510 file_bigendian = buf[0];
511 host_bigendian = bigendian();
513 read_or_die(buf, 1);
514 long_size = buf[0];
516 page_size = read4();
518 read_header_files();
520 read_ftrace_files();
521 read_event_files();
522 read_proc_kallsyms();
523 read_ftrace_printk();
525 size = calc_data_size - 1;
526 calc_data_size = 0;
527 repipe = false;
529 if (show_funcs) {
530 print_funcs();
531 return size;
533 if (show_printk) {
534 print_printk();
535 return size;
538 return size;