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
29 #include <sys/types.h>
41 #include "trace-event.h"
51 static unsigned long page_size;
53 static ssize_t calc_data_size;
56 static int do_read(int fd, void *buf, int size)
61 int ret = read(fd, buf, size);
67 int retw = write(STDOUT_FILENO, buf, ret);
69 if (retw <= 0 || retw != ret)
70 die("repiping input file");
80 static int read_or_die(void *data, int size)
84 r = do_read(input_fd, data, size);
86 die("reading input file (size expected=%d received=%d)",
95 /* If it fails, the next read will report it */
96 static void skip(int size)
102 r = size > BUFSIZ ? BUFSIZ : size;
108 static unsigned int read4(void)
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)
133 r = read(input_fd, &c, 1);
135 die("reading input file");
141 int retw = write(STDOUT_FILENO, &c, 1);
143 if (retw <= 0 || retw != r)
144 die("repiping input file string");
154 calc_data_size += size;
156 str = malloc_or_die(size);
157 memcpy(str, buf, size);
162 static void read_proc_kallsyms(void)
171 buf = malloc_or_die(size + 1);
172 read_or_die(buf, size);
175 parse_proc_kallsyms(buf, size);
180 static void read_ftrace_printk(void)
189 buf = malloc_or_die(size);
190 read_or_die(buf, size);
192 parse_ftrace_printk(buf, size);
197 static void read_header_files(void)
199 unsigned long long size;
203 read_or_die(buf, 12);
205 if (memcmp(buf, "header_page", 12) != 0)
206 die("did not read header page");
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");
222 header_event = malloc_or_die(size);
223 read_or_die(header_event, size);
227 static void read_ftrace_file(unsigned long long size)
231 buf = malloc_or_die(size);
232 read_or_die(buf, size);
233 parse_ftrace_file(buf, size);
237 static void read_event_file(char *sys, unsigned long long size)
241 buf = malloc_or_die(size);
242 read_or_die(buf, size);
243 parse_event_file(buf, size, sys);
247 static void read_ftrace_files(void)
249 unsigned long long size;
255 for (i = 0; i < count; i++) {
257 read_ftrace_file(size);
261 static void read_event_files(void)
263 unsigned long long size;
271 for (i = 0; i < systems; i++) {
275 for (x=0; x < count; x++) {
277 read_event_file(sys, size);
283 unsigned long long offset;
284 unsigned long long size;
285 unsigned long long timestamp;
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)
307 if (!cpu_data[cpu].page)
311 if (cpu_data[cpu].size <= page_size) {
312 free(cpu_data[cpu].page);
313 cpu_data[cpu].page = NULL;
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);
327 die("failed to read page");
329 /* reset the file pointer back */
330 lseek(input_fd, save_seek, SEEK_SET);
335 munmap(cpu_data[cpu].page, page_size);
336 cpu_data[cpu].page = NULL;
338 if (cpu_data[cpu].size <= page_size)
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)
353 return (type_len_ts >> 27) & ((1 << 5) - 1);
355 return type_len_ts & ((1 << 5) - 1);
358 static unsigned int ts4host(unsigned int type_len_ts)
361 return type_len_ts & ((1 << 27) - 1);
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)
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;
381 unsigned int length = 0;
383 if (cpu_data[cpu].next)
384 return cpu_data[cpu].next;
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);
395 switch (header_page_size_size) {
397 cpu_data[cpu].page_size = data2host4(ptr);
401 cpu_data[cpu].page_size = data2host8(ptr);
405 die("bad long size");
407 ptr = cpu_data[cpu].page + header_page_data_offset;
411 idx = calc_index(ptr, cpu);
413 if (idx >= cpu_data[cpu].page_size) {
415 return trace_peek_data(cpu);
418 type_len_ts = data2host4(ptr);
421 type_len = type_len4host(type_len_ts);
422 delta = ts4host(type_len_ts);
425 case RINGBUF_TYPE_PADDING:
427 die("error, hit unexpected end of page");
428 length = data2host4(ptr);
434 case RINGBUF_TYPE_TIME_EXTEND:
435 extend = data2host4(ptr);
439 cpu_data[cpu].timestamp += extend;
442 case RINGBUF_TYPE_TIME_STAMP:
446 length = data2host4(ptr);
448 die("here! length=%d", length);
451 length = type_len * 4;
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;
465 cpu_data[cpu].index = calc_index(ptr, cpu);
466 cpu_data[cpu].next = data;
471 struct record *trace_read_data(int cpu)
475 data = trace_peek_data(cpu);
476 cpu_data[cpu].next = NULL;
481 ssize_t trace_report(int fd, bool __repipe)
484 char test[] = { 23, 8, 68 };
486 int show_version = 0;
497 if (memcmp(buf, test, 3) != 0)
498 die("no trace data in the file");
501 if (memcmp(buf, "tracing", 7) != 0)
502 die("not a trace file (missing 'tracing' tag)");
504 version = read_string();
506 printf("version = %s\n", version);
510 file_bigendian = buf[0];
511 host_bigendian = bigendian();
522 read_proc_kallsyms();
523 read_ftrace_printk();
525 size = calc_data_size - 1;