tools/perf/util/trace-event-read.c

   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 <getopt.h>
  26 #include <stdarg.h>
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29 #include <sys/wait.h>
  30 #include <sys/mman.h>
  31 #include <pthread.h>
  32 #include <fcntl.h>
  33 #include <unistd.h>
  34 #include <errno.h>
  35
  36 #include "../perf.h"
  37 #include "util.h"
  38 #include "trace-event.h"
  39
  40 static int input_fd;
  41
  42 static ssize_t trace_data_size;
  43 static bool repipe;
  44
  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
  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 */
  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
 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
 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
 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
 162 static int read_proc_kallsyms(struct pevent *pevent)
 163 {
 164         unsigned int size;
 165         char *buf;
 166
 167         size = read4(pevent);
 168         if (!size)
 169                 return 0;
 170
 171         buf = malloc(size + 1);
 172         if (buf == NULL)
 173                 return -1;
 174
 175         if (do_read(buf, size) < 0) {
 176                 free(buf);
 177                 return -1;
 178         }
 179         buf[size] = '\0';
 180
 181         parse_proc_kallsyms(pevent, buf, size);
 182
 183         free(buf);
 184         return 0;
 185 }
 186
 187 static int read_ftrace_printk(struct pevent *pevent)
 188 {
 189         unsigned int size;
 190         char *buf;
 191
 192         /* it can have 0 size */
 193         size = read4(pevent);
 194         if (!size)
 195                 return 0;
 196
 197         buf = malloc(size);
 198         if (buf == NULL)
 199                 return -1;
 200
 201         if (do_read(buf, size) < 0) {
 202                 free(buf);
 203                 return -1;
 204         }
 205
 206         parse_ftrace_printk(pevent, buf, size);
 207
 208         free(buf);
 209         return 0;
 210 }
 211
 212 static int read_header_files(struct pevent *pevent)
 213 {
 214         unsigned long long size;
 215         char *header_page;
 216         char buf[BUFSIZ];
 217         int ret = 0;
 218
 219         if (do_read(buf, 12) < 0)
 220                 return -1;
 221
 222         if (memcmp(buf, "header_page", 12) != 0) {
 223                 pr_debug("did not read header page");
 224                 return -1;
 225         }
 226
 227         size = read8(pevent);
 228
 229         header_page = malloc(size);
 230         if (header_page == NULL)
 231                 return -1;
 232
 233         if (do_read(header_page, size) < 0) {
 234                 pr_debug("did not read header page");
 235                 free(header_page);
 236                 return -1;
 237         }
 238
 239         if (!pevent_parse_header_page(pevent, header_page, size,
 240                                       pevent_get_long_size(pevent))) {
 241                 /*
 242                  * The commit field in the page is of type long,
 243                  * use that instead, since it represents the kernel.
 244                  */
 245                 pevent_set_long_size(pevent, pevent->header_page_size_size);
 246         }
 247         free(header_page);
 248
 249         if (do_read(buf, 13) < 0)
 250                 return -1;
 251
 252         if (memcmp(buf, "header_event", 13) != 0) {
 253                 pr_debug("did not read header event");
 254                 return -1;
 255         }
 256
 257         size = read8(pevent);
 258         skip(size);
 259
 260         return ret;
 261 }
 262
 263 static int read_ftrace_file(struct pevent *pevent, unsigned long long size)
 264 {
 265         char *buf;
 266
 267         buf = malloc(size);
 268         if (buf == NULL)
 269                 return -1;
 270
 271         if (do_read(buf, size) < 0) {
 272                 free(buf);
 273                 return -1;
 274         }
 275
 276         parse_ftrace_file(pevent, buf, size);
 277         free(buf);
 278         return 0;
 279 }
 280
 281 static int read_event_file(struct pevent *pevent, char *sys,
 282                             unsigned long long size)
 283 {
 284         char *buf;
 285
 286         buf = malloc(size);
 287         if (buf == NULL)
 288                 return -1;
 289
 290         if (do_read(buf, size) < 0) {
 291                 free(buf);
 292                 return -1;
 293         }
 294
 295         parse_event_file(pevent, buf, size, sys);
 296         free(buf);
 297         return 0;
 298 }
 299
 300 static int read_ftrace_files(struct pevent *pevent)
 301 {
 302         unsigned long long size;
 303         int count;
 304         int i;
 305         int ret;
 306
 307         count = read4(pevent);
 308
 309         for (i = 0; i < count; i++) {
 310                 size = read8(pevent);
 311                 ret = read_ftrace_file(pevent, size);
 312                 if (ret)
 313                         return ret;
 314         }
 315         return 0;
 316 }
 317
 318 static int read_event_files(struct pevent *pevent)
 319 {
 320         unsigned long long size;
 321         char *sys;
 322         int systems;
 323         int count;
 324         int i,x;
 325         int ret;
 326
 327         systems = read4(pevent);
 328
 329         for (i = 0; i < systems; i++) {
 330                 sys = read_string();
 331                 if (sys == NULL)
 332                         return -1;
 333
 334                 count = read4(pevent);
 335
 336                 for (x=0; x < count; x++) {
 337                         size = read8(pevent);
 338                         ret = read_event_file(pevent, sys, size);
 339                         if (ret)
 340                                 return ret;
 341                 }
 342         }
 343         return 0;
 344 }
 345
 346 ssize_t trace_report(int fd, struct trace_event *tevent, bool __repipe)
 347 {
 348         char buf[BUFSIZ];
 349         char test[] = { 23, 8, 68 };
 350         char *version;
 351         int show_version = 0;
 352         int show_funcs = 0;
 353         int show_printk = 0;
 354         ssize_t size = -1;
 355         int file_bigendian;
 356         int host_bigendian;
 357         int file_long_size;
 358         int file_page_size;
 359         struct pevent *pevent = NULL;
 360         int err;
 361
 362         repipe = __repipe;
 363         input_fd = fd;
 364
 365         if (do_read(buf, 3) < 0)
 366                 return -1;
 367         if (memcmp(buf, test, 3) != 0) {
 368                 pr_debug("no trace data in the file");
 369                 return -1;
 370         }
 371
 372         if (do_read(buf, 7) < 0)
 373                 return -1;
 374         if (memcmp(buf, "tracing", 7) != 0) {
 375                 pr_debug("not a trace file (missing 'tracing' tag)");
 376                 return -1;
 377         }
 378
 379         version = read_string();
 380         if (version == NULL)
 381                 return -1;
 382         if (show_version)
 383                 printf("version = %s\n", version);
 384         free(version);
 385
 386         if (do_read(buf, 1) < 0)
 387                 return -1;
 388         file_bigendian = buf[0];
 389         host_bigendian = bigendian();
 390
 391         if (trace_event__init(tevent)) {
 392                 pr_debug("trace_event__init failed");
 393                 goto out;
 394         }
 395
 396         pevent = tevent->pevent;
 397
 398         pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
 399         pevent_set_file_bigendian(pevent, file_bigendian);
 400         pevent_set_host_bigendian(pevent, host_bigendian);
 401
 402         if (do_read(buf, 1) < 0)
 403                 goto out;
 404         file_long_size = buf[0];
 405
 406         file_page_size = read4(pevent);
 407         if (!file_page_size)
 408                 goto out;
 409
 410         pevent_set_long_size(pevent, file_long_size);
 411         pevent_set_page_size(pevent, file_page_size);
 412
 413         err = read_header_files(pevent);
 414         if (err)
 415                 goto out;
 416         err = read_ftrace_files(pevent);
 417         if (err)
 418                 goto out;
 419         err = read_event_files(pevent);
 420         if (err)
 421                 goto out;
 422         err = read_proc_kallsyms(pevent);
 423         if (err)
 424                 goto out;
 425         err = read_ftrace_printk(pevent);
 426         if (err)
 427                 goto out;
 428
 429         size = trace_data_size;
 430         repipe = false;
 431
 432         if (show_funcs) {
 433                 pevent_print_funcs(pevent);
 434         } else if (show_printk) {
 435                 pevent_print_printk(pevent);
 436         }
 437
 438         pevent = NULL;
 439
 440 out:
 441         if (pevent)
 442                 trace_event__cleanup(tevent);
 443         return size;
 444 }