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>
36 #include <linux/list.h>
37 #include <linux/kernel.h>
40 #include "trace-event.h"
46 #define TRACE_CTRL "tracing_on"
48 #define AVAILABLE "available_tracers"
49 #define CURRENT "current_tracer"
50 #define ITER_CTRL "trace_options"
51 #define MAX_LATENCY "tracing_max_latency"
53 unsigned int page_size;
55 static const char *output_file = "trace.info";
59 struct event_list *next;
64 struct events *sibling;
65 struct events *children;
71 static void *malloc_or_die(unsigned int size)
81 static const char *find_debugfs(void)
83 const char *path = debugfs_mount(NULL);
86 die("Your kernel not support debugfs filesystem");
92 * Finds the path to the debugfs/tracing
93 * Allocates the string and stores it.
95 static const char *find_tracing_dir(void)
98 static int tracing_found;
104 debugfs = find_debugfs();
106 tracing = malloc_or_die(strlen(debugfs) + 9);
108 sprintf(tracing, "%s/tracing", debugfs);
114 static char *get_tracing_file(const char *name)
119 tracing = find_tracing_dir();
123 file = malloc_or_die(strlen(tracing) + strlen(name) + 2);
125 sprintf(file, "%s/%s", tracing, name);
129 static void put_tracing_file(char *file)
134 static ssize_t calc_data_size;
136 static ssize_t write_or_die(const void *buf, size_t len)
140 if (calc_data_size) {
141 calc_data_size += len;
145 ret = write(output_fd, buf, len);
147 die("writing to '%s'", output_file);
154 unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
157 ptr = (unsigned int *)(void *)str;
158 return *ptr == 0x01020304;
161 /* unfortunately, you can not stat debugfs or proc files for size */
162 static void record_file(const char *file, size_t hdr_sz)
164 unsigned long long size = 0;
165 char buf[BUFSIZ], *sizep;
166 off_t hdr_pos = lseek(output_fd, 0, SEEK_CUR);
169 fd = open(file, O_RDONLY);
171 die("Can't read '%s'", file);
173 /* put in zeros for file size, then fill true size later */
175 write_or_die(&size, hdr_sz);
178 r = read(fd, buf, BUFSIZ);
181 write_or_die(buf, r);
186 /* ugh, handle big-endian hdr_size == 4 */
187 sizep = (char*)&size;
189 sizep += sizeof(u64) - hdr_sz;
191 if (hdr_sz && pwrite(output_fd, sizep, hdr_sz, hdr_pos) < 0)
192 die("writing to %s", output_file);
195 static void read_header_files(void)
200 path = get_tracing_file("events/header_page");
201 if (stat(path, &st) < 0)
202 die("can't read '%s'", path);
204 write_or_die("header_page", 12);
205 record_file(path, 8);
206 put_tracing_file(path);
208 path = get_tracing_file("events/header_event");
209 if (stat(path, &st) < 0)
210 die("can't read '%s'", path);
212 write_or_die("header_event", 13);
213 record_file(path, 8);
214 put_tracing_file(path);
217 static bool name_in_tp_list(char *sys, struct tracepoint_path *tps)
220 if (!strcmp(sys, tps->name))
228 static void copy_event_system(const char *sys, struct tracepoint_path *tps)
239 die("can't read directory '%s'", sys);
241 while ((dent = readdir(dir))) {
242 if (dent->d_type != DT_DIR ||
243 strcmp(dent->d_name, ".") == 0 ||
244 strcmp(dent->d_name, "..") == 0 ||
245 !name_in_tp_list(dent->d_name, tps))
247 format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
248 sprintf(format, "%s/%s/format", sys, dent->d_name);
249 ret = stat(format, &st);
256 write_or_die(&count, 4);
259 while ((dent = readdir(dir))) {
260 if (dent->d_type != DT_DIR ||
261 strcmp(dent->d_name, ".") == 0 ||
262 strcmp(dent->d_name, "..") == 0 ||
263 !name_in_tp_list(dent->d_name, tps))
265 format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
266 sprintf(format, "%s/%s/format", sys, dent->d_name);
267 ret = stat(format, &st);
270 record_file(format, 8);
277 static void read_ftrace_files(struct tracepoint_path *tps)
281 path = get_tracing_file("events/ftrace");
283 copy_event_system(path, tps);
285 put_tracing_file(path);
288 static bool system_in_tp_list(char *sys, struct tracepoint_path *tps)
291 if (!strcmp(sys, tps->system))
299 static void read_event_files(struct tracepoint_path *tps)
309 path = get_tracing_file("events");
313 die("can't read directory '%s'", path);
315 while ((dent = readdir(dir))) {
316 if (dent->d_type != DT_DIR ||
317 strcmp(dent->d_name, ".") == 0 ||
318 strcmp(dent->d_name, "..") == 0 ||
319 strcmp(dent->d_name, "ftrace") == 0 ||
320 !system_in_tp_list(dent->d_name, tps))
325 write_or_die(&count, 4);
328 while ((dent = readdir(dir))) {
329 if (dent->d_type != DT_DIR ||
330 strcmp(dent->d_name, ".") == 0 ||
331 strcmp(dent->d_name, "..") == 0 ||
332 strcmp(dent->d_name, "ftrace") == 0 ||
333 !system_in_tp_list(dent->d_name, tps))
335 sys = malloc_or_die(strlen(path) + strlen(dent->d_name) + 2);
336 sprintf(sys, "%s/%s", path, dent->d_name);
337 ret = stat(sys, &st);
339 write_or_die(dent->d_name, strlen(dent->d_name) + 1);
340 copy_event_system(sys, tps);
346 put_tracing_file(path);
349 static void read_proc_kallsyms(void)
352 const char *path = "/proc/kallsyms";
356 ret = stat(path, &st);
360 write_or_die(&size, 4);
363 record_file(path, 4);
366 static void read_ftrace_printk(void)
373 path = get_tracing_file("printk_formats");
374 ret = stat(path, &st);
378 write_or_die(&size, 4);
381 record_file(path, 4);
384 put_tracing_file(path);
387 static struct tracepoint_path *
388 get_tracepoints_path(struct list_head *pattrs)
390 struct tracepoint_path path, *ppath = &path;
391 struct perf_evsel *pos;
392 int nr_tracepoints = 0;
394 list_for_each_entry(pos, pattrs, node) {
395 if (pos->attr.type != PERF_TYPE_TRACEPOINT)
398 ppath->next = tracepoint_id_to_path(pos->attr.config);
400 die("%s\n", "No memory to alloc tracepoints list");
404 return nr_tracepoints > 0 ? path.next : NULL;
408 put_tracepoints_path(struct tracepoint_path *tps)
411 struct tracepoint_path *t = tps;
420 bool have_tracepoints(struct list_head *pattrs)
422 struct perf_evsel *pos;
424 list_for_each_entry(pos, pattrs, node)
425 if (pos->attr.type == PERF_TYPE_TRACEPOINT)
431 static void tracing_data_header(void)
435 /* just guessing this is someone's birthday.. ;) */
439 memcpy(buf + 3, "tracing", 7);
441 write_or_die(buf, 10);
443 write_or_die(VERSION, strlen(VERSION) + 1);
451 read_trace_init(buf[0], buf[0]);
453 write_or_die(buf, 1);
455 /* save size of long */
456 buf[0] = sizeof(long);
457 write_or_die(buf, 1);
460 page_size = sysconf(_SC_PAGESIZE);
461 write_or_die(&page_size, 4);
464 struct tracing_data *tracing_data_get(struct list_head *pattrs,
467 struct tracepoint_path *tps;
468 struct tracing_data *tdata;
472 tps = get_tracepoints_path(pattrs);
476 tdata = malloc_or_die(sizeof(*tdata));
483 snprintf(tdata->temp_file, sizeof(tdata->temp_file),
485 if (!mkstemp(tdata->temp_file))
486 die("Can't make temp file");
488 temp_fd = open(tdata->temp_file, O_RDWR);
490 die("Can't read '%s'", tdata->temp_file);
493 * Set the temp file the default output, so all the
494 * tracing data are stored into it.
499 tracing_data_header();
501 read_ftrace_files(tps);
502 read_event_files(tps);
503 read_proc_kallsyms();
504 read_ftrace_printk();
507 * All tracing data are stored by now, we can restore
508 * the default output file in case we used temp file.
511 tdata->size = lseek(output_fd, 0, SEEK_CUR);
516 put_tracepoints_path(tps);
520 void tracing_data_put(struct tracing_data *tdata)
523 record_file(tdata->temp_file, 0);
524 unlink(tdata->temp_file);
530 int read_tracing_data(int fd, struct list_head *pattrs)
532 struct tracing_data *tdata;
535 * We work over the real file, so we can write data
536 * directly, no temp file is needed.
538 tdata = tracing_data_get(pattrs, fd, false);
542 tracing_data_put(tdata);