6 #include <sys/utsname.h>
7 #ifdef HAVE_BACKTRACE_SUPPORT
16 #include <linux/kernel.h>
18 #include "callchain.h"
20 struct callchain_param callchain_param = {
21 .mode = CHAIN_GRAPH_ABS,
23 .order = ORDER_CALLEE,
28 * XXX We need to find a better place for these things...
30 unsigned int page_size;
33 bool test_attr__enabled;
35 bool perf_host = true;
36 bool perf_guest = false;
38 void event_attr_init(struct perf_event_attr *attr)
41 attr->exclude_host = 1;
43 attr->exclude_guest = 1;
44 /* to capture ABI version */
45 attr->size = sizeof(*attr);
48 int mkdir_p(char *path, mode_t mode)
57 if (stat(path, &st) == 0)
62 while ((d = strchr(d, '/'))) {
64 err = stat(path, &st) && mkdir(path, mode);
71 return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
79 char namebuf[PATH_MAX];
85 while ((d = readdir(dir)) != NULL && !ret) {
88 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
91 scnprintf(namebuf, sizeof(namebuf), "%s/%s",
94 ret = stat(namebuf, &statbuf);
96 pr_debug("stat failed: %s\n", namebuf);
100 if (S_ISREG(statbuf.st_mode))
101 ret = unlink(namebuf);
102 else if (S_ISDIR(statbuf.st_mode))
103 ret = rm_rf(namebuf);
105 pr_debug("unknown file: %s\n", namebuf);
117 static int slow_copyfile(const char *from, const char *to)
122 FILE *from_fp = fopen(from, "r"), *to_fp;
127 to_fp = fopen(to, "w");
129 goto out_fclose_from;
131 while (getline(&line, &n, from_fp) > 0)
132 if (fputs(line, to_fp) == EOF)
144 int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size)
149 pgoff = off_in & ~(page_size - 1);
152 ptr = mmap(NULL, off_in + size, PROT_READ, MAP_PRIVATE, ifd, pgoff);
153 if (ptr == MAP_FAILED)
157 ssize_t ret = pwrite(ofd, ptr + off_in, size, off_out);
158 if (ret < 0 && errno == EINTR)
167 munmap(ptr, off_in + size);
169 return size ? -1 : 0;
172 int copyfile_mode(const char *from, const char *to, mode_t mode)
177 char *tmp = NULL, *ptr = NULL;
182 /* extra 'x' at the end is to reserve space for '.' */
183 if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) {
187 ptr = strrchr(tmp, '/');
190 ptr = memmove(ptr + 1, ptr, strlen(ptr) - 1);
197 if (fchmod(tofd, mode))
200 if (st.st_size == 0) { /* /proc? do it slowly... */
201 err = slow_copyfile(from, tmp);
205 fromfd = open(from, O_RDONLY);
209 err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size);
222 int copyfile(const char *from, const char *to)
224 return copyfile_mode(from, to, 0755);
227 unsigned long convert_unit(unsigned long value, char *unit)
249 static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
251 void *buf_start = buf;
255 ssize_t ret = is_read ? read(fd, buf, left) :
256 write(fd, buf, left);
258 if (ret < 0 && errno == EINTR)
267 BUG_ON((size_t)(buf - buf_start) != n);
272 * Read exactly 'n' bytes or return an error.
274 ssize_t readn(int fd, void *buf, size_t n)
276 return ion(true, fd, buf, n);
280 * Write exactly 'n' bytes or return an error.
282 ssize_t writen(int fd, void *buf, size_t n)
284 return ion(false, fd, buf, n);
287 size_t hex_width(u64 v)
297 static int hex(char ch)
299 if ((ch >= '0') && (ch <= '9'))
301 if ((ch >= 'a') && (ch <= 'f'))
302 return ch - 'a' + 10;
303 if ((ch >= 'A') && (ch <= 'F'))
304 return ch - 'A' + 10;
309 * While we find nice hex chars, build a long_val.
310 * Return number of chars processed.
312 int hex2u64(const char *ptr, u64 *long_val)
318 const int hex_val = hex(*p);
323 *long_val = (*long_val << 4) | hex_val;
330 /* Obtain a backtrace and print it to stdout. */
331 #ifdef HAVE_BACKTRACE_SUPPORT
332 void dump_stack(void)
335 size_t size = backtrace(array, ARRAY_SIZE(array));
336 char **strings = backtrace_symbols(array, size);
339 printf("Obtained %zd stack frames.\n", size);
341 for (i = 0; i < size; i++)
342 printf("%s\n", strings[i]);
347 void dump_stack(void) {}
350 void sighandler_dump_stack(int sig)
352 psignal(sig, "perf");
357 void get_term_dimensions(struct winsize *ws)
359 char *s = getenv("LINES");
362 ws->ws_row = atoi(s);
363 s = getenv("COLUMNS");
365 ws->ws_col = atoi(s);
366 if (ws->ws_row && ws->ws_col)
371 if (ioctl(1, TIOCGWINSZ, ws) == 0 &&
372 ws->ws_row && ws->ws_col)
379 void set_term_quiet_input(struct termios *old)
385 tc.c_lflag &= ~(ICANON | ECHO);
388 tcsetattr(0, TCSANOW, &tc);
391 int parse_nsec_time(const char *str, u64 *ptime)
393 u64 time_sec, time_nsec;
396 time_sec = strtoul(str, &end, 10);
397 if (*end != '.' && *end != '\0')
404 if (strlen(++end) > 9)
407 strncpy(nsec_buf, end, 9);
410 /* make it nsec precision */
411 for (i = strlen(nsec_buf); i < 9; i++)
414 time_nsec = strtoul(nsec_buf, &end, 10);
420 *ptime = time_sec * NSEC_PER_SEC + time_nsec;
424 unsigned long parse_tag_value(const char *str, struct parse_tag *tags)
426 struct parse_tag *i = tags;
431 s = strchr(str, i->tag);
433 unsigned long int value;
436 value = strtoul(str, &endptr, 10);
440 if (value > ULONG_MAX / i->mult)
448 return (unsigned long) -1;
451 int get_stack_size(const char *str, unsigned long *_size)
455 unsigned long max_size = round_down(USHRT_MAX, sizeof(u64));
457 size = strtoul(str, &endptr, 0);
463 size = round_up(size, sizeof(u64));
464 if (!size || size > max_size)
472 pr_err("callchain: Incorrect stack dump size (max %ld): %s\n",
477 int parse_callchain_record(const char *arg, struct callchain_param *param)
479 char *tok, *name, *saveptr = NULL;
483 /* We need buffer that we know we can write to. */
484 buf = malloc(strlen(arg) + 1);
490 tok = strtok_r((char *)buf, ",", &saveptr);
491 name = tok ? : (char *)buf;
494 /* Framepointer style */
495 if (!strncmp(name, "fp", sizeof("fp"))) {
496 if (!strtok_r(NULL, ",", &saveptr)) {
497 param->record_mode = CALLCHAIN_FP;
500 pr_err("callchain: No more arguments "
501 "needed for --call-graph fp\n");
504 #ifdef HAVE_DWARF_UNWIND_SUPPORT
506 } else if (!strncmp(name, "dwarf", sizeof("dwarf"))) {
507 const unsigned long default_stack_dump_size = 8192;
510 param->record_mode = CALLCHAIN_DWARF;
511 param->dump_size = default_stack_dump_size;
513 tok = strtok_r(NULL, ",", &saveptr);
515 unsigned long size = 0;
517 ret = get_stack_size(tok, &size);
518 param->dump_size = size;
520 #endif /* HAVE_DWARF_UNWIND_SUPPORT */
521 } else if (!strncmp(name, "lbr", sizeof("lbr"))) {
522 if (!strtok_r(NULL, ",", &saveptr)) {
523 param->record_mode = CALLCHAIN_LBR;
526 pr_err("callchain: No more arguments "
527 "needed for --call-graph lbr\n");
530 pr_err("callchain: Unknown --call-graph option "
541 int filename__read_str(const char *filename, char **buf, size_t *sizep)
543 size_t size = 0, alloc_size = 0;
544 void *bf = NULL, *nbf;
546 char sbuf[STRERR_BUFSIZE];
548 fd = open(filename, O_RDONLY);
553 if (size == alloc_size) {
554 alloc_size += BUFSIZ;
555 nbf = realloc(bf, alloc_size);
564 n = read(fd, bf + size, alloc_size - size);
567 pr_warning("read failed %d: %s\n", errno,
568 strerror_r(errno, sbuf, sizeof(sbuf)));
589 const char *get_filename_for_perf_kvm(void)
591 const char *filename;
593 if (perf_host && !perf_guest)
594 filename = strdup("perf.data.host");
595 else if (!perf_host && perf_guest)
596 filename = strdup("perf.data.guest");
598 filename = strdup("perf.data.kvm");
603 int perf_event_paranoid(void)
607 if (sysctl__read_int("kernel/perf_event_paranoid", &value))
613 void mem_bswap_32(void *src, int byte_size)
616 while (byte_size > 0) {
618 byte_size -= sizeof(u32);
623 void mem_bswap_64(void *src, int byte_size)
627 while (byte_size > 0) {
629 byte_size -= sizeof(u64);
634 bool find_process(const char *name)
636 size_t len = strlen(name);
641 dir = opendir(procfs__mountpoint());
645 /* Walk through the directory. */
646 while (ret && (d = readdir(dir)) != NULL) {
651 if ((d->d_type != DT_DIR) ||
652 !strcmp(".", d->d_name) ||
653 !strcmp("..", d->d_name))
656 scnprintf(path, sizeof(path), "%s/%s/comm",
657 procfs__mountpoint(), d->d_name);
659 if (filename__read_str(path, &data, &size))
662 ret = strncmp(name, data, len);
667 return ret ? false : true;
671 fetch_kernel_version(unsigned int *puint, char *str,
674 struct utsname utsname;
675 int version, patchlevel, sublevel, err;
680 if (str && str_size) {
681 strncpy(str, utsname.release, str_size);
682 str[str_size - 1] = '\0';
685 err = sscanf(utsname.release, "%d.%d.%d",
686 &version, &patchlevel, &sublevel);
689 pr_debug("Unablt to get kernel version from uname '%s'\n",
695 *puint = (version << 16) + (patchlevel << 8) + sublevel;