2 * Copyright (C) 2008,2009, 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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
28 #include <sys/types.h>
37 #include <linux/kernel.h>
40 #include "trace-event.h"
46 #define STR(x) _STR(x)
49 #define TRACE_CTRL "tracing_on"
51 #define AVAILABLE "available_tracers"
52 #define CURRENT "current_tracer"
53 #define ITER_CTRL "trace_options"
54 #define MAX_LATENCY "tracing_max_latency"
56 unsigned int page_size;
58 static const char *output_file = "trace.info";
62 struct event_list *next;
67 struct events *sibling;
68 struct events *children;
75 static void die(const char *fmt, ...)
87 vfprintf(stderr, fmt, ap);
90 fprintf(stderr, "\n");
94 void *malloc_or_die(unsigned int size)
104 static const char *find_debugfs(void)
106 const char *path = debugfs_mount(NULL);
109 die("Your kernel not support debugfs filesystem");
115 * Finds the path to the debugfs/tracing
116 * Allocates the string and stores it.
118 static const char *find_tracing_dir(void)
120 static char *tracing;
121 static int tracing_found;
127 debugfs = find_debugfs();
129 tracing = malloc_or_die(strlen(debugfs) + 9);
131 sprintf(tracing, "%s/tracing", debugfs);
137 static char *get_tracing_file(const char *name)
142 tracing = find_tracing_dir();
146 file = malloc_or_die(strlen(tracing) + strlen(name) + 2);
148 sprintf(file, "%s/%s", tracing, name);
152 static void put_tracing_file(char *file)
157 static ssize_t write_or_die(const void *buf, size_t len)
161 ret = write(output_fd, buf, len);
163 die("writing to '%s'", output_file);
170 unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
173 ptr = (unsigned int *)(void *)str;
174 return *ptr == 0x01020304;
177 static unsigned long long copy_file_fd(int fd)
179 unsigned long long size = 0;
184 r = read(fd, buf, BUFSIZ);
187 write_or_die(buf, r);
194 static unsigned long long copy_file(const char *file)
196 unsigned long long size = 0;
199 fd = open(file, O_RDONLY);
201 die("Can't read '%s'", file);
202 size = copy_file_fd(fd);
208 static unsigned long get_size_fd(int fd)
210 unsigned long long size = 0;
215 r = read(fd, buf, BUFSIZ);
220 lseek(fd, 0, SEEK_SET);
225 static unsigned long get_size(const char *file)
227 unsigned long long size = 0;
230 fd = open(file, O_RDONLY);
232 die("Can't read '%s'", file);
233 size = get_size_fd(fd);
239 static void read_header_files(void)
241 unsigned long long size, check_size;
245 path = get_tracing_file("events/header_page");
246 fd = open(path, O_RDONLY);
248 die("can't read '%s'", path);
250 /* unfortunately, you can not stat debugfs files for size */
251 size = get_size_fd(fd);
253 write_or_die("header_page", 12);
254 write_or_die(&size, 8);
255 check_size = copy_file_fd(fd);
258 if (size != check_size)
259 die("wrong size for '%s' size=%lld read=%lld",
260 path, size, check_size);
261 put_tracing_file(path);
263 path = get_tracing_file("events/header_event");
264 fd = open(path, O_RDONLY);
266 die("can't read '%s'", path);
268 size = get_size_fd(fd);
270 write_or_die("header_event", 13);
271 write_or_die(&size, 8);
272 check_size = copy_file_fd(fd);
273 if (size != check_size)
274 die("wrong size for '%s'", path);
275 put_tracing_file(path);
279 static bool name_in_tp_list(char *sys, struct tracepoint_path *tps)
282 if (!strcmp(sys, tps->name))
290 static void copy_event_system(const char *sys, struct tracepoint_path *tps)
292 unsigned long long size, check_size;
302 die("can't read directory '%s'", sys);
304 while ((dent = readdir(dir))) {
305 if (dent->d_type != DT_DIR ||
306 strcmp(dent->d_name, ".") == 0 ||
307 strcmp(dent->d_name, "..") == 0 ||
308 !name_in_tp_list(dent->d_name, tps))
310 format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
311 sprintf(format, "%s/%s/format", sys, dent->d_name);
312 ret = stat(format, &st);
319 write_or_die(&count, 4);
322 while ((dent = readdir(dir))) {
323 if (dent->d_type != DT_DIR ||
324 strcmp(dent->d_name, ".") == 0 ||
325 strcmp(dent->d_name, "..") == 0 ||
326 !name_in_tp_list(dent->d_name, tps))
328 format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
329 sprintf(format, "%s/%s/format", sys, dent->d_name);
330 ret = stat(format, &st);
333 /* unfortunately, you can not stat debugfs files for size */
334 size = get_size(format);
335 write_or_die(&size, 8);
336 check_size = copy_file(format);
337 if (size != check_size)
338 die("error in size of file '%s'", format);
346 static void read_ftrace_files(struct tracepoint_path *tps)
350 path = get_tracing_file("events/ftrace");
352 copy_event_system(path, tps);
354 put_tracing_file(path);
357 static bool system_in_tp_list(char *sys, struct tracepoint_path *tps)
360 if (!strcmp(sys, tps->system))
368 static void read_event_files(struct tracepoint_path *tps)
378 path = get_tracing_file("events");
382 die("can't read directory '%s'", path);
384 while ((dent = readdir(dir))) {
385 if (dent->d_type != DT_DIR ||
386 strcmp(dent->d_name, ".") == 0 ||
387 strcmp(dent->d_name, "..") == 0 ||
388 strcmp(dent->d_name, "ftrace") == 0 ||
389 !system_in_tp_list(dent->d_name, tps))
394 write_or_die(&count, 4);
397 while ((dent = readdir(dir))) {
398 if (dent->d_type != DT_DIR ||
399 strcmp(dent->d_name, ".") == 0 ||
400 strcmp(dent->d_name, "..") == 0 ||
401 strcmp(dent->d_name, "ftrace") == 0 ||
402 !system_in_tp_list(dent->d_name, tps))
404 sys = malloc_or_die(strlen(path) + strlen(dent->d_name) + 2);
405 sprintf(sys, "%s/%s", path, dent->d_name);
406 ret = stat(sys, &st);
408 write_or_die(dent->d_name, strlen(dent->d_name) + 1);
409 copy_event_system(sys, tps);
415 put_tracing_file(path);
418 static void read_proc_kallsyms(void)
420 unsigned int size, check_size;
421 const char *path = "/proc/kallsyms";
425 ret = stat(path, &st);
429 write_or_die(&size, 4);
432 size = get_size(path);
433 write_or_die(&size, 4);
434 check_size = copy_file(path);
435 if (size != check_size)
436 die("error in size of file '%s'", path);
440 static void read_ftrace_printk(void)
442 unsigned int size, check_size;
447 path = get_tracing_file("printk_formats");
448 ret = stat(path, &st);
452 write_or_die(&size, 4);
455 size = get_size(path);
456 write_or_die(&size, 4);
457 check_size = copy_file(path);
458 if (size != check_size)
459 die("error in size of file '%s'", path);
461 put_tracing_file(path);
464 static struct tracepoint_path *
465 get_tracepoints_path(struct perf_event_attr *pattrs, int nb_events)
467 struct tracepoint_path path, *ppath = &path;
468 int i, nr_tracepoints = 0;
470 for (i = 0; i < nb_events; i++) {
471 if (pattrs[i].type != PERF_TYPE_TRACEPOINT)
474 ppath->next = tracepoint_id_to_path(pattrs[i].config);
476 die("%s\n", "No memory to alloc tracepoints list");
480 return nr_tracepoints > 0 ? path.next : NULL;
483 int read_tracing_data(int fd, struct perf_event_attr *pattrs, int nb_events)
486 struct tracepoint_path *tps = get_tracepoints_path(pattrs, nb_events);
489 * What? No tracepoints? No sense writing anything here, bail out.
499 memcpy(buf + 3, "tracing", 7);
501 write_or_die(buf, 10);
503 write_or_die(VERSION, strlen(VERSION) + 1);
511 write_or_die(buf, 1);
513 /* save size of long */
514 buf[0] = sizeof(long);
515 write_or_die(buf, 1);
518 page_size = getpagesize();
519 write_or_die(&page_size, 4);
522 read_ftrace_files(tps);
523 read_event_files(tps);
524 read_proc_kallsyms();
525 read_ftrace_printk();