1#include "../perf.h"
2#include "util.h"
3#include "debug.h"
4#include <api/fs/fs.h>
5#include <sys/mman.h>
6#include <sys/utsname.h>
7#ifdef HAVE_BACKTRACE_SUPPORT
8#include <execinfo.h>
9#endif
10#include <stdio.h>
11#include <stdlib.h>
12#include <string.h>
13#include <errno.h>
14#include <limits.h>
15#include <byteswap.h>
16#include <linux/kernel.h>
17#include <linux/log2.h>
18#include <unistd.h>
19#include "callchain.h"
20#include "strlist.h"
21
22#define CALLCHAIN_PARAM_DEFAULT \
23 .mode = CHAIN_GRAPH_ABS, \
24 .min_percent = 0.5, \
25 .order = ORDER_CALLEE, \
26 .key = CCKEY_FUNCTION, \
27 .value = CCVAL_PERCENT, \
28
29struct callchain_param callchain_param = {
30 CALLCHAIN_PARAM_DEFAULT
31};
32
33struct callchain_param callchain_param_default = {
34 CALLCHAIN_PARAM_DEFAULT
35};
36
37
38
39
40unsigned int page_size;
41int cacheline_size;
42
43int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH;
44int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK;
45
46bool test_attr__enabled;
47
48bool perf_host = true;
49bool perf_guest = false;
50
51void event_attr_init(struct perf_event_attr *attr)
52{
53 if (!perf_host)
54 attr->exclude_host = 1;
55 if (!perf_guest)
56 attr->exclude_guest = 1;
57
58 attr->size = sizeof(*attr);
59}
60
61int mkdir_p(char *path, mode_t mode)
62{
63 struct stat st;
64 int err;
65 char *d = path;
66
67 if (*d != '/')
68 return -1;
69
70 if (stat(path, &st) == 0)
71 return 0;
72
73 while (*++d == '/');
74
75 while ((d = strchr(d, '/'))) {
76 *d = '\0';
77 err = stat(path, &st) && mkdir(path, mode);
78 *d++ = '/';
79 if (err)
80 return -1;
81 while (*d == '/')
82 ++d;
83 }
84 return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
85}
86
87int rm_rf(char *path)
88{
89 DIR *dir;
90 int ret = 0;
91 struct dirent *d;
92 char namebuf[PATH_MAX];
93
94 dir = opendir(path);
95 if (dir == NULL)
96 return 0;
97
98 while ((d = readdir(dir)) != NULL && !ret) {
99 struct stat statbuf;
100
101 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
102 continue;
103
104 scnprintf(namebuf, sizeof(namebuf), "%s/%s",
105 path, d->d_name);
106
107
108 ret = lstat(namebuf, &statbuf);
109 if (ret < 0) {
110 pr_debug("stat failed: %s\n", namebuf);
111 break;
112 }
113
114 if (S_ISDIR(statbuf.st_mode))
115 ret = rm_rf(namebuf);
116 else
117 ret = unlink(namebuf);
118 }
119 closedir(dir);
120
121 if (ret < 0)
122 return ret;
123
124 return rmdir(path);
125}
126
127
128bool lsdir_no_dot_filter(const char *name __maybe_unused, struct dirent *d)
129{
130 return d->d_name[0] != '.';
131}
132
133
134struct strlist *lsdir(const char *name,
135 bool (*filter)(const char *, struct dirent *))
136{
137 struct strlist *list = NULL;
138 DIR *dir;
139 struct dirent *d;
140
141 dir = opendir(name);
142 if (!dir)
143 return NULL;
144
145 list = strlist__new(NULL, NULL);
146 if (!list) {
147 errno = ENOMEM;
148 goto out;
149 }
150
151 while ((d = readdir(dir)) != NULL) {
152 if (!filter || filter(name, d))
153 strlist__add(list, d->d_name);
154 }
155
156out:
157 closedir(dir);
158 return list;
159}
160
161static int slow_copyfile(const char *from, const char *to)
162{
163 int err = -1;
164 char *line = NULL;
165 size_t n;
166 FILE *from_fp = fopen(from, "r"), *to_fp;
167
168 if (from_fp == NULL)
169 goto out;
170
171 to_fp = fopen(to, "w");
172 if (to_fp == NULL)
173 goto out_fclose_from;
174
175 while (getline(&line, &n, from_fp) > 0)
176 if (fputs(line, to_fp) == EOF)
177 goto out_fclose_to;
178 err = 0;
179out_fclose_to:
180 fclose(to_fp);
181 free(line);
182out_fclose_from:
183 fclose(from_fp);
184out:
185 return err;
186}
187
188int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size)
189{
190 void *ptr;
191 loff_t pgoff;
192
193 pgoff = off_in & ~(page_size - 1);
194 off_in -= pgoff;
195
196 ptr = mmap(NULL, off_in + size, PROT_READ, MAP_PRIVATE, ifd, pgoff);
197 if (ptr == MAP_FAILED)
198 return -1;
199
200 while (size) {
201 ssize_t ret = pwrite(ofd, ptr + off_in, size, off_out);
202 if (ret < 0 && errno == EINTR)
203 continue;
204 if (ret <= 0)
205 break;
206
207 size -= ret;
208 off_in += ret;
209 off_out -= ret;
210 }
211 munmap(ptr, off_in + size);
212
213 return size ? -1 : 0;
214}
215
216int copyfile_mode(const char *from, const char *to, mode_t mode)
217{
218 int fromfd, tofd;
219 struct stat st;
220 int err = -1;
221 char *tmp = NULL, *ptr = NULL;
222
223 if (stat(from, &st))
224 goto out;
225
226
227 if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) {
228 tmp = NULL;
229 goto out;
230 }
231 ptr = strrchr(tmp, '/');
232 if (!ptr)
233 goto out;
234 ptr = memmove(ptr + 1, ptr, strlen(ptr) - 1);
235 *ptr = '.';
236
237 tofd = mkstemp(tmp);
238 if (tofd < 0)
239 goto out;
240
241 if (fchmod(tofd, mode))
242 goto out_close_to;
243
244 if (st.st_size == 0) {
245 err = slow_copyfile(from, tmp);
246 goto out_close_to;
247 }
248
249 fromfd = open(from, O_RDONLY);
250 if (fromfd < 0)
251 goto out_close_to;
252
253 err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size);
254
255 close(fromfd);
256out_close_to:
257 close(tofd);
258 if (!err)
259 err = link(tmp, to);
260 unlink(tmp);
261out:
262 free(tmp);
263 return err;
264}
265
266int copyfile(const char *from, const char *to)
267{
268 return copyfile_mode(from, to, 0755);
269}
270
271unsigned long convert_unit(unsigned long value, char *unit)
272{
273 *unit = ' ';
274
275 if (value > 1000) {
276 value /= 1000;
277 *unit = 'K';
278 }
279
280 if (value > 1000) {
281 value /= 1000;
282 *unit = 'M';
283 }
284
285 if (value > 1000) {
286 value /= 1000;
287 *unit = 'G';
288 }
289
290 return value;
291}
292
293static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
294{
295 void *buf_start = buf;
296 size_t left = n;
297
298 while (left) {
299 ssize_t ret = is_read ? read(fd, buf, left) :
300 write(fd, buf, left);
301
302 if (ret < 0 && errno == EINTR)
303 continue;
304 if (ret <= 0)
305 return ret;
306
307 left -= ret;
308 buf += ret;
309 }
310
311 BUG_ON((size_t)(buf - buf_start) != n);
312 return n;
313}
314
315
316
317
318ssize_t readn(int fd, void *buf, size_t n)
319{
320 return ion(true, fd, buf, n);
321}
322
323
324
325
326ssize_t writen(int fd, void *buf, size_t n)
327{
328 return ion(false, fd, buf, n);
329}
330
331size_t hex_width(u64 v)
332{
333 size_t n = 1;
334
335 while ((v >>= 4))
336 ++n;
337
338 return n;
339}
340
341static int hex(char ch)
342{
343 if ((ch >= '0') && (ch <= '9'))
344 return ch - '0';
345 if ((ch >= 'a') && (ch <= 'f'))
346 return ch - 'a' + 10;
347 if ((ch >= 'A') && (ch <= 'F'))
348 return ch - 'A' + 10;
349 return -1;
350}
351
352
353
354
355
356int hex2u64(const char *ptr, u64 *long_val)
357{
358 const char *p = ptr;
359 *long_val = 0;
360
361 while (*p) {
362 const int hex_val = hex(*p);
363
364 if (hex_val < 0)
365 break;
366
367 *long_val = (*long_val << 4) | hex_val;
368 p++;
369 }
370
371 return p - ptr;
372}
373
374
375#ifdef HAVE_BACKTRACE_SUPPORT
376void dump_stack(void)
377{
378 void *array[16];
379 size_t size = backtrace(array, ARRAY_SIZE(array));
380 char **strings = backtrace_symbols(array, size);
381 size_t i;
382
383 printf("Obtained %zd stack frames.\n", size);
384
385 for (i = 0; i < size; i++)
386 printf("%s\n", strings[i]);
387
388 free(strings);
389}
390#else
391void dump_stack(void) {}
392#endif
393
394void sighandler_dump_stack(int sig)
395{
396 psignal(sig, "perf");
397 dump_stack();
398 signal(sig, SIG_DFL);
399 raise(sig);
400}
401
402int parse_nsec_time(const char *str, u64 *ptime)
403{
404 u64 time_sec, time_nsec;
405 char *end;
406
407 time_sec = strtoul(str, &end, 10);
408 if (*end != '.' && *end != '\0')
409 return -1;
410
411 if (*end == '.') {
412 int i;
413 char nsec_buf[10];
414
415 if (strlen(++end) > 9)
416 return -1;
417
418 strncpy(nsec_buf, end, 9);
419 nsec_buf[9] = '\0';
420
421
422 for (i = strlen(nsec_buf); i < 9; i++)
423 nsec_buf[i] = '0';
424
425 time_nsec = strtoul(nsec_buf, &end, 10);
426 if (*end != '\0')
427 return -1;
428 } else
429 time_nsec = 0;
430
431 *ptime = time_sec * NSEC_PER_SEC + time_nsec;
432 return 0;
433}
434
435unsigned long parse_tag_value(const char *str, struct parse_tag *tags)
436{
437 struct parse_tag *i = tags;
438
439 while (i->tag) {
440 char *s;
441
442 s = strchr(str, i->tag);
443 if (s) {
444 unsigned long int value;
445 char *endptr;
446
447 value = strtoul(str, &endptr, 10);
448 if (s != endptr)
449 break;
450
451 if (value > ULONG_MAX / i->mult)
452 break;
453 value *= i->mult;
454 return value;
455 }
456 i++;
457 }
458
459 return (unsigned long) -1;
460}
461
462int get_stack_size(const char *str, unsigned long *_size)
463{
464 char *endptr;
465 unsigned long size;
466 unsigned long max_size = round_down(USHRT_MAX, sizeof(u64));
467
468 size = strtoul(str, &endptr, 0);
469
470 do {
471 if (*endptr)
472 break;
473
474 size = round_up(size, sizeof(u64));
475 if (!size || size > max_size)
476 break;
477
478 *_size = size;
479 return 0;
480
481 } while (0);
482
483 pr_err("callchain: Incorrect stack dump size (max %ld): %s\n",
484 max_size, str);
485 return -1;
486}
487
488int parse_callchain_record(const char *arg, struct callchain_param *param)
489{
490 char *tok, *name, *saveptr = NULL;
491 char *buf;
492 int ret = -1;
493
494
495 buf = malloc(strlen(arg) + 1);
496 if (!buf)
497 return -ENOMEM;
498
499 strcpy(buf, arg);
500
501 tok = strtok_r((char *)buf, ",", &saveptr);
502 name = tok ? : (char *)buf;
503
504 do {
505
506 if (!strncmp(name, "fp", sizeof("fp"))) {
507 if (!strtok_r(NULL, ",", &saveptr)) {
508 param->record_mode = CALLCHAIN_FP;
509 ret = 0;
510 } else
511 pr_err("callchain: No more arguments "
512 "needed for --call-graph fp\n");
513 break;
514
515
516 } else if (!strncmp(name, "dwarf", sizeof("dwarf"))) {
517 const unsigned long default_stack_dump_size = 8192;
518
519 ret = 0;
520 param->record_mode = CALLCHAIN_DWARF;
521 param->dump_size = default_stack_dump_size;
522
523 tok = strtok_r(NULL, ",", &saveptr);
524 if (tok) {
525 unsigned long size = 0;
526
527 ret = get_stack_size(tok, &size);
528 param->dump_size = size;
529 }
530 } else if (!strncmp(name, "lbr", sizeof("lbr"))) {
531 if (!strtok_r(NULL, ",", &saveptr)) {
532 param->record_mode = CALLCHAIN_LBR;
533 ret = 0;
534 } else
535 pr_err("callchain: No more arguments "
536 "needed for --call-graph lbr\n");
537 break;
538 } else {
539 pr_err("callchain: Unknown --call-graph option "
540 "value: %s\n", arg);
541 break;
542 }
543
544 } while (0);
545
546 free(buf);
547 return ret;
548}
549
550const char *get_filename_for_perf_kvm(void)
551{
552 const char *filename;
553
554 if (perf_host && !perf_guest)
555 filename = strdup("perf.data.host");
556 else if (!perf_host && perf_guest)
557 filename = strdup("perf.data.guest");
558 else
559 filename = strdup("perf.data.kvm");
560
561 return filename;
562}
563
564int perf_event_paranoid(void)
565{
566 int value;
567
568 if (sysctl__read_int("kernel/perf_event_paranoid", &value))
569 return INT_MAX;
570
571 return value;
572}
573
574void mem_bswap_32(void *src, int byte_size)
575{
576 u32 *m = src;
577 while (byte_size > 0) {
578 *m = bswap_32(*m);
579 byte_size -= sizeof(u32);
580 ++m;
581 }
582}
583
584void mem_bswap_64(void *src, int byte_size)
585{
586 u64 *m = src;
587
588 while (byte_size > 0) {
589 *m = bswap_64(*m);
590 byte_size -= sizeof(u64);
591 ++m;
592 }
593}
594
595bool find_process(const char *name)
596{
597 size_t len = strlen(name);
598 DIR *dir;
599 struct dirent *d;
600 int ret = -1;
601
602 dir = opendir(procfs__mountpoint());
603 if (!dir)
604 return false;
605
606
607 while (ret && (d = readdir(dir)) != NULL) {
608 char path[PATH_MAX];
609 char *data;
610 size_t size;
611
612 if ((d->d_type != DT_DIR) ||
613 !strcmp(".", d->d_name) ||
614 !strcmp("..", d->d_name))
615 continue;
616
617 scnprintf(path, sizeof(path), "%s/%s/comm",
618 procfs__mountpoint(), d->d_name);
619
620 if (filename__read_str(path, &data, &size))
621 continue;
622
623 ret = strncmp(name, data, len);
624 free(data);
625 }
626
627 closedir(dir);
628 return ret ? false : true;
629}
630
631int
632fetch_kernel_version(unsigned int *puint, char *str,
633 size_t str_size)
634{
635 struct utsname utsname;
636 int version, patchlevel, sublevel, err;
637
638 if (uname(&utsname))
639 return -1;
640
641 if (str && str_size) {
642 strncpy(str, utsname.release, str_size);
643 str[str_size - 1] = '\0';
644 }
645
646 err = sscanf(utsname.release, "%d.%d.%d",
647 &version, &patchlevel, &sublevel);
648
649 if (err != 3) {
650 pr_debug("Unablt to get kernel version from uname '%s'\n",
651 utsname.release);
652 return -1;
653 }
654
655 if (puint)
656 *puint = (version << 16) + (patchlevel << 8) + sublevel;
657 return 0;
658}
659
660const char *perf_tip(const char *dirpath)
661{
662 struct strlist *tips;
663 struct str_node *node;
664 char *tip = NULL;
665 struct strlist_config conf = {
666 .dirname = dirpath,
667 .file_only = true,
668 };
669
670 tips = strlist__new("tips.txt", &conf);
671 if (tips == NULL)
672 return errno == ENOENT ? NULL : "Tip: get more memory! ;-p";
673
674 if (strlist__nr_entries(tips) == 0)
675 goto out;
676
677 node = strlist__entry(tips, random() % strlist__nr_entries(tips));
678 if (asprintf(&tip, "Tip: %s", node->s) < 0)
679 tip = (char *)"Tip: get more memory! ;-)";
680
681out:
682 strlist__delete(tips);
683
684 return tip;
685}
686
687bool is_regular_file(const char *file)
688{
689 struct stat st;
690
691 if (stat(file, &st))
692 return false;
693
694 return S_ISREG(st.st_mode);
695}
696
697int fetch_current_timestamp(char *buf, size_t sz)
698{
699 struct timeval tv;
700 struct tm tm;
701 char dt[32];
702
703 if (gettimeofday(&tv, NULL) || !localtime_r(&tv.tv_sec, &tm))
704 return -1;
705
706 if (!strftime(dt, sizeof(dt), "%Y%m%d%H%M%S", &tm))
707 return -1;
708
709 scnprintf(buf, sz, "%s%02u", dt, (unsigned)tv.tv_usec / 10000);
710
711 return 0;
712}
713
714void print_binary(unsigned char *data, size_t len,
715 size_t bytes_per_line, print_binary_t printer,
716 void *extra)
717{
718 size_t i, j, mask;
719
720 if (!printer)
721 return;
722
723 bytes_per_line = roundup_pow_of_two(bytes_per_line);
724 mask = bytes_per_line - 1;
725
726 printer(BINARY_PRINT_DATA_BEGIN, 0, extra);
727 for (i = 0; i < len; i++) {
728 if ((i & mask) == 0) {
729 printer(BINARY_PRINT_LINE_BEGIN, -1, extra);
730 printer(BINARY_PRINT_ADDR, i, extra);
731 }
732
733 printer(BINARY_PRINT_NUM_DATA, data[i], extra);
734
735 if (((i & mask) == mask) || i == len - 1) {
736 for (j = 0; j < mask-(i & mask); j++)
737 printer(BINARY_PRINT_NUM_PAD, -1, extra);
738
739 printer(BINARY_PRINT_SEP, i, extra);
740 for (j = i & ~mask; j <= i; j++)
741 printer(BINARY_PRINT_CHAR_DATA, data[j], extra);
742 for (j = 0; j < mask-(i & mask); j++)
743 printer(BINARY_PRINT_CHAR_PAD, i, extra);
744 printer(BINARY_PRINT_LINE_END, -1, extra);
745 }
746 }
747 printer(BINARY_PRINT_DATA_END, -1, extra);
748}
749
750int is_printable_array(char *p, unsigned int len)
751{
752 unsigned int i;
753
754 if (!p || !len || p[len - 1] != 0)
755 return 0;
756
757 len--;
758
759 for (i = 0; i < len; i++) {
760 if (!isprint(p[i]) && !isspace(p[i]))
761 return 0;
762 }
763 return 1;
764}
765
