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1// SPDX-License-Identifier: GPL-2.0
2#include "../perf.h"
3#include "util.h"
4#include "debug.h"
5#include <api/fs/fs.h>
6#include <sys/mman.h>
7#include <sys/stat.h>
8#include <sys/utsname.h>
9#include <dirent.h>
10#include <fcntl.h>
11#include <inttypes.h>
12#include <signal.h>
13#include <stdio.h>
14#include <stdlib.h>
15#include <string.h>
16#include <errno.h>
17#include <limits.h>
18#include <linux/kernel.h>
19#include <linux/log2.h>
20#include <linux/time64.h>
21#include <unistd.h>
22#include "strlist.h"
23
24/*
25 * XXX We need to find a better place for these things...
26 */
27
28bool perf_singlethreaded = true;
29
30void perf_set_singlethreaded(void)
31{
32 perf_singlethreaded = true;
33}
34
35void perf_set_multithreaded(void)
36{
37 perf_singlethreaded = false;
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 /* to capture ABI version */
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(const 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 /* We have to check symbolic link itself */
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/* A filter which removes dot files */
128bool lsdir_no_dot_filter(const char *name __maybe_unused, struct dirent *d)
129{
130 return d->d_name[0] != '.';
131}
132
133/* lsdir reads a directory and store it in strlist */
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, struct nsinfo *nsi)
162{
163 int err = -1;
164 char *line = NULL;
165 size_t n;
166 FILE *from_fp, *to_fp;
167 struct nscookie nsc;
168
169 nsinfo__mountns_enter(nsi, &nsc);
170 from_fp = fopen(from, "r");
171 nsinfo__mountns_exit(&nsc);
172 if (from_fp == NULL)
173 goto out;
174
175 to_fp = fopen(to, "w");
176 if (to_fp == NULL)
177 goto out_fclose_from;
178
179 while (getline(&line, &n, from_fp) > 0)
180 if (fputs(line, to_fp) == EOF)
181 goto out_fclose_to;
182 err = 0;
183out_fclose_to:
184 fclose(to_fp);
185 free(line);
186out_fclose_from:
187 fclose(from_fp);
188out:
189 return err;
190}
191
192static int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size)
193{
194 void *ptr;
195 loff_t pgoff;
196
197 pgoff = off_in & ~(page_size - 1);
198 off_in -= pgoff;
199
200 ptr = mmap(NULL, off_in + size, PROT_READ, MAP_PRIVATE, ifd, pgoff);
201 if (ptr == MAP_FAILED)
202 return -1;
203
204 while (size) {
205 ssize_t ret = pwrite(ofd, ptr + off_in, size, off_out);
206 if (ret < 0 && errno == EINTR)
207 continue;
208 if (ret <= 0)
209 break;
210
211 size -= ret;
212 off_in += ret;
213 off_out += ret;
214 }
215 munmap(ptr, off_in + size);
216
217 return size ? -1 : 0;
218}
219
220static int copyfile_mode_ns(const char *from, const char *to, mode_t mode,
221 struct nsinfo *nsi)
222{
223 int fromfd, tofd;
224 struct stat st;
225 int err;
226 char *tmp = NULL, *ptr = NULL;
227 struct nscookie nsc;
228
229 nsinfo__mountns_enter(nsi, &nsc);
230 err = stat(from, &st);
231 nsinfo__mountns_exit(&nsc);
232 if (err)
233 goto out;
234 err = -1;
235
236 /* extra 'x' at the end is to reserve space for '.' */
237 if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) {
238 tmp = NULL;
239 goto out;
240 }
241 ptr = strrchr(tmp, '/');
242 if (!ptr)
243 goto out;
244 ptr = memmove(ptr + 1, ptr, strlen(ptr) - 1);
245 *ptr = '.';
246
247 tofd = mkstemp(tmp);
248 if (tofd < 0)
249 goto out;
250
251 if (fchmod(tofd, mode))
252 goto out_close_to;
253
254 if (st.st_size == 0) { /* /proc? do it slowly... */
255 err = slow_copyfile(from, tmp, nsi);
256 goto out_close_to;
257 }
258
259 nsinfo__mountns_enter(nsi, &nsc);
260 fromfd = open(from, O_RDONLY);
261 nsinfo__mountns_exit(&nsc);
262 if (fromfd < 0)
263 goto out_close_to;
264
265 err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size);
266
267 close(fromfd);
268out_close_to:
269 close(tofd);
270 if (!err)
271 err = link(tmp, to);
272 unlink(tmp);
273out:
274 free(tmp);
275 return err;
276}
277
278int copyfile_ns(const char *from, const char *to, struct nsinfo *nsi)
279{
280 return copyfile_mode_ns(from, to, 0755, nsi);
281}
282
283int copyfile_mode(const char *from, const char *to, mode_t mode)
284{
285 return copyfile_mode_ns(from, to, mode, NULL);
286}
287
288int copyfile(const char *from, const char *to)
289{
290 return copyfile_mode(from, to, 0755);
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 /* buf must be treated as const if !is_read. */
300 ssize_t ret = is_read ? read(fd, buf, left) :
301 write(fd, buf, left);
302
303 if (ret < 0 && errno == EINTR)
304 continue;
305 if (ret <= 0)
306 return ret;
307
308 left -= ret;
309 buf += ret;
310 }
311
312 BUG_ON((size_t)(buf - buf_start) != n);
313 return n;
314}
315
316/*
317 * Read exactly 'n' bytes or return an error.
318 */
319ssize_t readn(int fd, void *buf, size_t n)
320{
321 return ion(true, fd, buf, n);
322}
323
324/*
325 * Write exactly 'n' bytes or return an error.
326 */
327ssize_t writen(int fd, const void *buf, size_t n)
328{
329 /* ion does not modify buf. */
330 return ion(false, fd, (void *)buf, n);
331}
332
333size_t hex_width(u64 v)
334{
335 size_t n = 1;
336
337 while ((v >>= 4))
338 ++n;
339
340 return n;
341}
342
343/*
344 * While we find nice hex chars, build a long_val.
345 * Return number of chars processed.
346 */
347int hex2u64(const char *ptr, u64 *long_val)
348{
349 char *p;
350
351 *long_val = strtoull(ptr, &p, 16);
352
353 return p - ptr;
354}
355
356int perf_event_paranoid(void)
357{
358 int value;
359
360 if (sysctl__read_int("kernel/perf_event_paranoid", &value))
361 return INT_MAX;
362
363 return value;
364}
365static int
366fetch_ubuntu_kernel_version(unsigned int *puint)
367{
368 ssize_t len;
369 size_t line_len = 0;
370 char *ptr, *line = NULL;
371 int version, patchlevel, sublevel, err;
372 FILE *vsig;
373
374 if (!puint)
375 return 0;
376
377 vsig = fopen("/proc/version_signature", "r");
378 if (!vsig) {
379 pr_debug("Open /proc/version_signature failed: %s\n",
380 strerror(errno));
381 return -1;
382 }
383
384 len = getline(&line, &line_len, vsig);
385 fclose(vsig);
386 err = -1;
387 if (len <= 0) {
388 pr_debug("Reading from /proc/version_signature failed: %s\n",
389 strerror(errno));
390 goto errout;
391 }
392
393 ptr = strrchr(line, ' ');
394 if (!ptr) {
395 pr_debug("Parsing /proc/version_signature failed: %s\n", line);
396 goto errout;
397 }
398
399 err = sscanf(ptr + 1, "%d.%d.%d",
400 &version, &patchlevel, &sublevel);
401 if (err != 3) {
402 pr_debug("Unable to get kernel version from /proc/version_signature '%s'\n",
403 line);
404 goto errout;
405 }
406
407 *puint = (version << 16) + (patchlevel << 8) + sublevel;
408 err = 0;
409errout:
410 free(line);
411 return err;
412}
413
414int
415fetch_kernel_version(unsigned int *puint, char *str,
416 size_t str_size)
417{
418 struct utsname utsname;
419 int version, patchlevel, sublevel, err;
420 bool int_ver_ready = false;
421
422 if (access("/proc/version_signature", R_OK) == 0)
423 if (!fetch_ubuntu_kernel_version(puint))
424 int_ver_ready = true;
425
426 if (uname(&utsname))
427 return -1;
428
429 if (str && str_size) {
430 strncpy(str, utsname.release, str_size);
431 str[str_size - 1] = '\0';
432 }
433
434 if (!puint || int_ver_ready)
435 return 0;
436
437 err = sscanf(utsname.release, "%d.%d.%d",
438 &version, &patchlevel, &sublevel);
439
440 if (err != 3) {
441 pr_debug("Unable to get kernel version from uname '%s'\n",
442 utsname.release);
443 return -1;
444 }
445
446 *puint = (version << 16) + (patchlevel << 8) + sublevel;
447 return 0;
448}
449
450const char *perf_tip(const char *dirpath)
451{
452 struct strlist *tips;
453 struct str_node *node;
454 char *tip = NULL;
455 struct strlist_config conf = {
456 .dirname = dirpath,
457 .file_only = true,
458 };
459
460 tips = strlist__new("tips.txt", &conf);
461 if (tips == NULL)
462 return errno == ENOENT ? NULL :
463 "Tip: check path of tips.txt or get more memory! ;-p";
464
465 if (strlist__nr_entries(tips) == 0)
466 goto out;
467
468 node = strlist__entry(tips, random() % strlist__nr_entries(tips));
469 if (asprintf(&tip, "Tip: %s", node->s) < 0)
470 tip = (char *)"Tip: get more memory! ;-)";
471
472out:
473 strlist__delete(tips);
474
475 return tip;
476}
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 <linux/time64.h>
19#include <unistd.h>
20#include "callchain.h"
21#include "strlist.h"
22
23#define CALLCHAIN_PARAM_DEFAULT \
24 .mode = CHAIN_GRAPH_ABS, \
25 .min_percent = 0.5, \
26 .order = ORDER_CALLEE, \
27 .key = CCKEY_FUNCTION, \
28 .value = CCVAL_PERCENT, \
29
30struct callchain_param callchain_param = {
31 CALLCHAIN_PARAM_DEFAULT
32};
33
34struct callchain_param callchain_param_default = {
35 CALLCHAIN_PARAM_DEFAULT
36};
37
38/*
39 * XXX We need to find a better place for these things...
40 */
41unsigned int page_size;
42int cacheline_size;
43
44int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH;
45int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK;
46
47bool test_attr__enabled;
48
49bool perf_host = true;
50bool perf_guest = false;
51
52void event_attr_init(struct perf_event_attr *attr)
53{
54 if (!perf_host)
55 attr->exclude_host = 1;
56 if (!perf_guest)
57 attr->exclude_guest = 1;
58 /* to capture ABI version */
59 attr->size = sizeof(*attr);
60}
61
62int mkdir_p(char *path, mode_t mode)
63{
64 struct stat st;
65 int err;
66 char *d = path;
67
68 if (*d != '/')
69 return -1;
70
71 if (stat(path, &st) == 0)
72 return 0;
73
74 while (*++d == '/');
75
76 while ((d = strchr(d, '/'))) {
77 *d = '\0';
78 err = stat(path, &st) && mkdir(path, mode);
79 *d++ = '/';
80 if (err)
81 return -1;
82 while (*d == '/')
83 ++d;
84 }
85 return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
86}
87
88int rm_rf(char *path)
89{
90 DIR *dir;
91 int ret = 0;
92 struct dirent *d;
93 char namebuf[PATH_MAX];
94
95 dir = opendir(path);
96 if (dir == NULL)
97 return 0;
98
99 while ((d = readdir(dir)) != NULL && !ret) {
100 struct stat statbuf;
101
102 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
103 continue;
104
105 scnprintf(namebuf, sizeof(namebuf), "%s/%s",
106 path, d->d_name);
107
108 /* We have to check symbolic link itself */
109 ret = lstat(namebuf, &statbuf);
110 if (ret < 0) {
111 pr_debug("stat failed: %s\n", namebuf);
112 break;
113 }
114
115 if (S_ISDIR(statbuf.st_mode))
116 ret = rm_rf(namebuf);
117 else
118 ret = unlink(namebuf);
119 }
120 closedir(dir);
121
122 if (ret < 0)
123 return ret;
124
125 return rmdir(path);
126}
127
128/* A filter which removes dot files */
129bool lsdir_no_dot_filter(const char *name __maybe_unused, struct dirent *d)
130{
131 return d->d_name[0] != '.';
132}
133
134/* lsdir reads a directory and store it in strlist */
135struct strlist *lsdir(const char *name,
136 bool (*filter)(const char *, struct dirent *))
137{
138 struct strlist *list = NULL;
139 DIR *dir;
140 struct dirent *d;
141
142 dir = opendir(name);
143 if (!dir)
144 return NULL;
145
146 list = strlist__new(NULL, NULL);
147 if (!list) {
148 errno = ENOMEM;
149 goto out;
150 }
151
152 while ((d = readdir(dir)) != NULL) {
153 if (!filter || filter(name, d))
154 strlist__add(list, d->d_name);
155 }
156
157out:
158 closedir(dir);
159 return list;
160}
161
162static int slow_copyfile(const char *from, const char *to)
163{
164 int err = -1;
165 char *line = NULL;
166 size_t n;
167 FILE *from_fp = fopen(from, "r"), *to_fp;
168
169 if (from_fp == NULL)
170 goto out;
171
172 to_fp = fopen(to, "w");
173 if (to_fp == NULL)
174 goto out_fclose_from;
175
176 while (getline(&line, &n, from_fp) > 0)
177 if (fputs(line, to_fp) == EOF)
178 goto out_fclose_to;
179 err = 0;
180out_fclose_to:
181 fclose(to_fp);
182 free(line);
183out_fclose_from:
184 fclose(from_fp);
185out:
186 return err;
187}
188
189int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size)
190{
191 void *ptr;
192 loff_t pgoff;
193
194 pgoff = off_in & ~(page_size - 1);
195 off_in -= pgoff;
196
197 ptr = mmap(NULL, off_in + size, PROT_READ, MAP_PRIVATE, ifd, pgoff);
198 if (ptr == MAP_FAILED)
199 return -1;
200
201 while (size) {
202 ssize_t ret = pwrite(ofd, ptr + off_in, size, off_out);
203 if (ret < 0 && errno == EINTR)
204 continue;
205 if (ret <= 0)
206 break;
207
208 size -= ret;
209 off_in += ret;
210 off_out -= ret;
211 }
212 munmap(ptr, off_in + size);
213
214 return size ? -1 : 0;
215}
216
217int copyfile_mode(const char *from, const char *to, mode_t mode)
218{
219 int fromfd, tofd;
220 struct stat st;
221 int err = -1;
222 char *tmp = NULL, *ptr = NULL;
223
224 if (stat(from, &st))
225 goto out;
226
227 /* extra 'x' at the end is to reserve space for '.' */
228 if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) {
229 tmp = NULL;
230 goto out;
231 }
232 ptr = strrchr(tmp, '/');
233 if (!ptr)
234 goto out;
235 ptr = memmove(ptr + 1, ptr, strlen(ptr) - 1);
236 *ptr = '.';
237
238 tofd = mkstemp(tmp);
239 if (tofd < 0)
240 goto out;
241
242 if (fchmod(tofd, mode))
243 goto out_close_to;
244
245 if (st.st_size == 0) { /* /proc? do it slowly... */
246 err = slow_copyfile(from, tmp);
247 goto out_close_to;
248 }
249
250 fromfd = open(from, O_RDONLY);
251 if (fromfd < 0)
252 goto out_close_to;
253
254 err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size);
255
256 close(fromfd);
257out_close_to:
258 close(tofd);
259 if (!err)
260 err = link(tmp, to);
261 unlink(tmp);
262out:
263 free(tmp);
264 return err;
265}
266
267int copyfile(const char *from, const char *to)
268{
269 return copyfile_mode(from, to, 0755);
270}
271
272unsigned long convert_unit(unsigned long value, char *unit)
273{
274 *unit = ' ';
275
276 if (value > 1000) {
277 value /= 1000;
278 *unit = 'K';
279 }
280
281 if (value > 1000) {
282 value /= 1000;
283 *unit = 'M';
284 }
285
286 if (value > 1000) {
287 value /= 1000;
288 *unit = 'G';
289 }
290
291 return value;
292}
293
294static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
295{
296 void *buf_start = buf;
297 size_t left = n;
298
299 while (left) {
300 ssize_t ret = is_read ? read(fd, buf, left) :
301 write(fd, buf, left);
302
303 if (ret < 0 && errno == EINTR)
304 continue;
305 if (ret <= 0)
306 return ret;
307
308 left -= ret;
309 buf += ret;
310 }
311
312 BUG_ON((size_t)(buf - buf_start) != n);
313 return n;
314}
315
316/*
317 * Read exactly 'n' bytes or return an error.
318 */
319ssize_t readn(int fd, void *buf, size_t n)
320{
321 return ion(true, fd, buf, n);
322}
323
324/*
325 * Write exactly 'n' bytes or return an error.
326 */
327ssize_t writen(int fd, void *buf, size_t n)
328{
329 return ion(false, fd, buf, n);
330}
331
332size_t hex_width(u64 v)
333{
334 size_t n = 1;
335
336 while ((v >>= 4))
337 ++n;
338
339 return n;
340}
341
342static int hex(char ch)
343{
344 if ((ch >= '0') && (ch <= '9'))
345 return ch - '0';
346 if ((ch >= 'a') && (ch <= 'f'))
347 return ch - 'a' + 10;
348 if ((ch >= 'A') && (ch <= 'F'))
349 return ch - 'A' + 10;
350 return -1;
351}
352
353/*
354 * While we find nice hex chars, build a long_val.
355 * Return number of chars processed.
356 */
357int hex2u64(const char *ptr, u64 *long_val)
358{
359 const char *p = ptr;
360 *long_val = 0;
361
362 while (*p) {
363 const int hex_val = hex(*p);
364
365 if (hex_val < 0)
366 break;
367
368 *long_val = (*long_val << 4) | hex_val;
369 p++;
370 }
371
372 return p - ptr;
373}
374
375/* Obtain a backtrace and print it to stdout. */
376#ifdef HAVE_BACKTRACE_SUPPORT
377void dump_stack(void)
378{
379 void *array[16];
380 size_t size = backtrace(array, ARRAY_SIZE(array));
381 char **strings = backtrace_symbols(array, size);
382 size_t i;
383
384 printf("Obtained %zd stack frames.\n", size);
385
386 for (i = 0; i < size; i++)
387 printf("%s\n", strings[i]);
388
389 free(strings);
390}
391#else
392void dump_stack(void) {}
393#endif
394
395void sighandler_dump_stack(int sig)
396{
397 psignal(sig, "perf");
398 dump_stack();
399 signal(sig, SIG_DFL);
400 raise(sig);
401}
402
403int timestamp__scnprintf_usec(u64 timestamp, char *buf, size_t sz)
404{
405 u64 sec = timestamp / NSEC_PER_SEC;
406 u64 usec = (timestamp % NSEC_PER_SEC) / NSEC_PER_USEC;
407
408 return scnprintf(buf, sz, "%"PRIu64".%06"PRIu64, sec, usec);
409}
410
411unsigned long parse_tag_value(const char *str, struct parse_tag *tags)
412{
413 struct parse_tag *i = tags;
414
415 while (i->tag) {
416 char *s;
417
418 s = strchr(str, i->tag);
419 if (s) {
420 unsigned long int value;
421 char *endptr;
422
423 value = strtoul(str, &endptr, 10);
424 if (s != endptr)
425 break;
426
427 if (value > ULONG_MAX / i->mult)
428 break;
429 value *= i->mult;
430 return value;
431 }
432 i++;
433 }
434
435 return (unsigned long) -1;
436}
437
438int get_stack_size(const char *str, unsigned long *_size)
439{
440 char *endptr;
441 unsigned long size;
442 unsigned long max_size = round_down(USHRT_MAX, sizeof(u64));
443
444 size = strtoul(str, &endptr, 0);
445
446 do {
447 if (*endptr)
448 break;
449
450 size = round_up(size, sizeof(u64));
451 if (!size || size > max_size)
452 break;
453
454 *_size = size;
455 return 0;
456
457 } while (0);
458
459 pr_err("callchain: Incorrect stack dump size (max %ld): %s\n",
460 max_size, str);
461 return -1;
462}
463
464int parse_callchain_record(const char *arg, struct callchain_param *param)
465{
466 char *tok, *name, *saveptr = NULL;
467 char *buf;
468 int ret = -1;
469
470 /* We need buffer that we know we can write to. */
471 buf = malloc(strlen(arg) + 1);
472 if (!buf)
473 return -ENOMEM;
474
475 strcpy(buf, arg);
476
477 tok = strtok_r((char *)buf, ",", &saveptr);
478 name = tok ? : (char *)buf;
479
480 do {
481 /* Framepointer style */
482 if (!strncmp(name, "fp", sizeof("fp"))) {
483 if (!strtok_r(NULL, ",", &saveptr)) {
484 param->record_mode = CALLCHAIN_FP;
485 ret = 0;
486 } else
487 pr_err("callchain: No more arguments "
488 "needed for --call-graph fp\n");
489 break;
490
491 /* Dwarf style */
492 } else if (!strncmp(name, "dwarf", sizeof("dwarf"))) {
493 const unsigned long default_stack_dump_size = 8192;
494
495 ret = 0;
496 param->record_mode = CALLCHAIN_DWARF;
497 param->dump_size = default_stack_dump_size;
498
499 tok = strtok_r(NULL, ",", &saveptr);
500 if (tok) {
501 unsigned long size = 0;
502
503 ret = get_stack_size(tok, &size);
504 param->dump_size = size;
505 }
506 } else if (!strncmp(name, "lbr", sizeof("lbr"))) {
507 if (!strtok_r(NULL, ",", &saveptr)) {
508 param->record_mode = CALLCHAIN_LBR;
509 ret = 0;
510 } else
511 pr_err("callchain: No more arguments "
512 "needed for --call-graph lbr\n");
513 break;
514 } else {
515 pr_err("callchain: Unknown --call-graph option "
516 "value: %s\n", arg);
517 break;
518 }
519
520 } while (0);
521
522 free(buf);
523 return ret;
524}
525
526const char *get_filename_for_perf_kvm(void)
527{
528 const char *filename;
529
530 if (perf_host && !perf_guest)
531 filename = strdup("perf.data.host");
532 else if (!perf_host && perf_guest)
533 filename = strdup("perf.data.guest");
534 else
535 filename = strdup("perf.data.kvm");
536
537 return filename;
538}
539
540int perf_event_paranoid(void)
541{
542 int value;
543
544 if (sysctl__read_int("kernel/perf_event_paranoid", &value))
545 return INT_MAX;
546
547 return value;
548}
549
550void mem_bswap_32(void *src, int byte_size)
551{
552 u32 *m = src;
553 while (byte_size > 0) {
554 *m = bswap_32(*m);
555 byte_size -= sizeof(u32);
556 ++m;
557 }
558}
559
560void mem_bswap_64(void *src, int byte_size)
561{
562 u64 *m = src;
563
564 while (byte_size > 0) {
565 *m = bswap_64(*m);
566 byte_size -= sizeof(u64);
567 ++m;
568 }
569}
570
571bool find_process(const char *name)
572{
573 size_t len = strlen(name);
574 DIR *dir;
575 struct dirent *d;
576 int ret = -1;
577
578 dir = opendir(procfs__mountpoint());
579 if (!dir)
580 return false;
581
582 /* Walk through the directory. */
583 while (ret && (d = readdir(dir)) != NULL) {
584 char path[PATH_MAX];
585 char *data;
586 size_t size;
587
588 if ((d->d_type != DT_DIR) ||
589 !strcmp(".", d->d_name) ||
590 !strcmp("..", d->d_name))
591 continue;
592
593 scnprintf(path, sizeof(path), "%s/%s/comm",
594 procfs__mountpoint(), d->d_name);
595
596 if (filename__read_str(path, &data, &size))
597 continue;
598
599 ret = strncmp(name, data, len);
600 free(data);
601 }
602
603 closedir(dir);
604 return ret ? false : true;
605}
606
607static int
608fetch_ubuntu_kernel_version(unsigned int *puint)
609{
610 ssize_t len;
611 size_t line_len = 0;
612 char *ptr, *line = NULL;
613 int version, patchlevel, sublevel, err;
614 FILE *vsig = fopen("/proc/version_signature", "r");
615
616 if (!vsig) {
617 pr_debug("Open /proc/version_signature failed: %s\n",
618 strerror(errno));
619 return -1;
620 }
621
622 len = getline(&line, &line_len, vsig);
623 fclose(vsig);
624 err = -1;
625 if (len <= 0) {
626 pr_debug("Reading from /proc/version_signature failed: %s\n",
627 strerror(errno));
628 goto errout;
629 }
630
631 ptr = strrchr(line, ' ');
632 if (!ptr) {
633 pr_debug("Parsing /proc/version_signature failed: %s\n", line);
634 goto errout;
635 }
636
637 err = sscanf(ptr + 1, "%d.%d.%d",
638 &version, &patchlevel, &sublevel);
639 if (err != 3) {
640 pr_debug("Unable to get kernel version from /proc/version_signature '%s'\n",
641 line);
642 goto errout;
643 }
644
645 if (puint)
646 *puint = (version << 16) + (patchlevel << 8) + sublevel;
647 err = 0;
648errout:
649 free(line);
650 return err;
651}
652
653int
654fetch_kernel_version(unsigned int *puint, char *str,
655 size_t str_size)
656{
657 struct utsname utsname;
658 int version, patchlevel, sublevel, err;
659 bool int_ver_ready = false;
660
661 if (access("/proc/version_signature", R_OK) == 0)
662 if (!fetch_ubuntu_kernel_version(puint))
663 int_ver_ready = true;
664
665 if (uname(&utsname))
666 return -1;
667
668 if (str && str_size) {
669 strncpy(str, utsname.release, str_size);
670 str[str_size - 1] = '\0';
671 }
672
673 err = sscanf(utsname.release, "%d.%d.%d",
674 &version, &patchlevel, &sublevel);
675
676 if (err != 3) {
677 pr_debug("Unable to get kernel version from uname '%s'\n",
678 utsname.release);
679 return -1;
680 }
681
682 if (puint && !int_ver_ready)
683 *puint = (version << 16) + (patchlevel << 8) + sublevel;
684 return 0;
685}
686
687const char *perf_tip(const char *dirpath)
688{
689 struct strlist *tips;
690 struct str_node *node;
691 char *tip = NULL;
692 struct strlist_config conf = {
693 .dirname = dirpath,
694 .file_only = true,
695 };
696
697 tips = strlist__new("tips.txt", &conf);
698 if (tips == NULL)
699 return errno == ENOENT ? NULL : "Tip: get more memory! ;-p";
700
701 if (strlist__nr_entries(tips) == 0)
702 goto out;
703
704 node = strlist__entry(tips, random() % strlist__nr_entries(tips));
705 if (asprintf(&tip, "Tip: %s", node->s) < 0)
706 tip = (char *)"Tip: get more memory! ;-)";
707
708out:
709 strlist__delete(tips);
710
711 return tip;
712}
713
714bool is_regular_file(const char *file)
715{
716 struct stat st;
717
718 if (stat(file, &st))
719 return false;
720
721 return S_ISREG(st.st_mode);
722}
723
724int fetch_current_timestamp(char *buf, size_t sz)
725{
726 struct timeval tv;
727 struct tm tm;
728 char dt[32];
729
730 if (gettimeofday(&tv, NULL) || !localtime_r(&tv.tv_sec, &tm))
731 return -1;
732
733 if (!strftime(dt, sizeof(dt), "%Y%m%d%H%M%S", &tm))
734 return -1;
735
736 scnprintf(buf, sz, "%s%02u", dt, (unsigned)tv.tv_usec / 10000);
737
738 return 0;
739}
740
741void print_binary(unsigned char *data, size_t len,
742 size_t bytes_per_line, print_binary_t printer,
743 void *extra)
744{
745 size_t i, j, mask;
746
747 if (!printer)
748 return;
749
750 bytes_per_line = roundup_pow_of_two(bytes_per_line);
751 mask = bytes_per_line - 1;
752
753 printer(BINARY_PRINT_DATA_BEGIN, 0, extra);
754 for (i = 0; i < len; i++) {
755 if ((i & mask) == 0) {
756 printer(BINARY_PRINT_LINE_BEGIN, -1, extra);
757 printer(BINARY_PRINT_ADDR, i, extra);
758 }
759
760 printer(BINARY_PRINT_NUM_DATA, data[i], extra);
761
762 if (((i & mask) == mask) || i == len - 1) {
763 for (j = 0; j < mask-(i & mask); j++)
764 printer(BINARY_PRINT_NUM_PAD, -1, extra);
765
766 printer(BINARY_PRINT_SEP, i, extra);
767 for (j = i & ~mask; j <= i; j++)
768 printer(BINARY_PRINT_CHAR_DATA, data[j], extra);
769 for (j = 0; j < mask-(i & mask); j++)
770 printer(BINARY_PRINT_CHAR_PAD, i, extra);
771 printer(BINARY_PRINT_LINE_END, -1, extra);
772 }
773 }
774 printer(BINARY_PRINT_DATA_END, -1, extra);
775}
776
777int is_printable_array(char *p, unsigned int len)
778{
779 unsigned int i;
780
781 if (!p || !len || p[len - 1] != 0)
782 return 0;
783
784 len--;
785
786 for (i = 0; i < len; i++) {
787 if (!isprint(p[i]) && !isspace(p[i]))
788 return 0;
789 }
790 return 1;
791}