]>
Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1aed2671 | 2 | #include "../perf.h" |
4cf40131 | 3 | #include "util.h" |
84f5d36f | 4 | #include "debug.h" |
cd0cfad7 | 5 | #include <api/fs/fs.h> |
69e3f52d | 6 | #include <sys/mman.h> |
7a8ef4c4 | 7 | #include <sys/stat.h> |
07bc5c69 | 8 | #include <sys/utsname.h> |
76b31a29 | 9 | #include <dirent.h> |
fd20e811 | 10 | #include <inttypes.h> |
9607ad3a | 11 | #include <signal.h> |
dc4552bf ACM |
12 | #include <stdio.h> |
13 | #include <stdlib.h> | |
cef82c9f JO |
14 | #include <string.h> |
15 | #include <errno.h> | |
1a47245d | 16 | #include <limits.h> |
838d1452 | 17 | #include <linux/kernel.h> |
c339b1a9 | 18 | #include <linux/log2.h> |
bd48c63e | 19 | #include <linux/time64.h> |
9398c484 | 20 | #include <unistd.h> |
14cbfbeb | 21 | #include "strlist.h" |
23aadb1f | 22 | |
1aed2671 JR |
23 | /* |
24 | * XXX We need to find a better place for these things... | |
25 | */ | |
0c1fe6b2 | 26 | unsigned int page_size; |
2b1b7100 | 27 | int cacheline_size; |
0c1fe6b2 | 28 | |
a29d5c9b ACM |
29 | int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH; |
30 | int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK; | |
4cb93446 | 31 | |
0c6332e9 ACM |
32 | bool test_attr__enabled; |
33 | ||
1aed2671 | 34 | bool perf_host = true; |
c4a7dca9 | 35 | bool perf_guest = false; |
1aed2671 JR |
36 | |
37 | void event_attr_init(struct perf_event_attr *attr) | |
38 | { | |
39 | if (!perf_host) | |
40 | attr->exclude_host = 1; | |
41 | if (!perf_guest) | |
42 | attr->exclude_guest = 1; | |
7e1ccd38 SE |
43 | /* to capture ABI version */ |
44 | attr->size = sizeof(*attr); | |
1aed2671 JR |
45 | } |
46 | ||
4cf40131 ACM |
47 | int mkdir_p(char *path, mode_t mode) |
48 | { | |
49 | struct stat st; | |
50 | int err; | |
51 | char *d = path; | |
52 | ||
53 | if (*d != '/') | |
54 | return -1; | |
55 | ||
56 | if (stat(path, &st) == 0) | |
57 | return 0; | |
58 | ||
59 | while (*++d == '/'); | |
60 | ||
61 | while ((d = strchr(d, '/'))) { | |
62 | *d = '\0'; | |
63 | err = stat(path, &st) && mkdir(path, mode); | |
64 | *d++ = '/'; | |
65 | if (err) | |
66 | return -1; | |
67 | while (*d == '/') | |
68 | ++d; | |
69 | } | |
70 | return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0; | |
71 | } | |
72 | ||
9a9c733d | 73 | int rm_rf(const char *path) |
0b1de0be NK |
74 | { |
75 | DIR *dir; | |
76 | int ret = 0; | |
77 | struct dirent *d; | |
78 | char namebuf[PATH_MAX]; | |
79 | ||
80 | dir = opendir(path); | |
81 | if (dir == NULL) | |
82 | return 0; | |
83 | ||
84 | while ((d = readdir(dir)) != NULL && !ret) { | |
85 | struct stat statbuf; | |
86 | ||
87 | if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, "..")) | |
88 | continue; | |
89 | ||
90 | scnprintf(namebuf, sizeof(namebuf), "%s/%s", | |
91 | path, d->d_name); | |
92 | ||
2a1ef032 MH |
93 | /* We have to check symbolic link itself */ |
94 | ret = lstat(namebuf, &statbuf); | |
0b1de0be NK |
95 | if (ret < 0) { |
96 | pr_debug("stat failed: %s\n", namebuf); | |
97 | break; | |
98 | } | |
99 | ||
2a1ef032 | 100 | if (S_ISDIR(statbuf.st_mode)) |
0b1de0be | 101 | ret = rm_rf(namebuf); |
2a1ef032 MH |
102 | else |
103 | ret = unlink(namebuf); | |
0b1de0be NK |
104 | } |
105 | closedir(dir); | |
106 | ||
107 | if (ret < 0) | |
108 | return ret; | |
109 | ||
110 | return rmdir(path); | |
111 | } | |
112 | ||
e1ce726e MH |
113 | /* A filter which removes dot files */ |
114 | bool lsdir_no_dot_filter(const char *name __maybe_unused, struct dirent *d) | |
115 | { | |
116 | return d->d_name[0] != '.'; | |
117 | } | |
118 | ||
119 | /* lsdir reads a directory and store it in strlist */ | |
120 | struct strlist *lsdir(const char *name, | |
121 | bool (*filter)(const char *, struct dirent *)) | |
122 | { | |
123 | struct strlist *list = NULL; | |
124 | DIR *dir; | |
125 | struct dirent *d; | |
126 | ||
127 | dir = opendir(name); | |
128 | if (!dir) | |
129 | return NULL; | |
130 | ||
131 | list = strlist__new(NULL, NULL); | |
132 | if (!list) { | |
357a54f3 | 133 | errno = ENOMEM; |
e1ce726e MH |
134 | goto out; |
135 | } | |
136 | ||
137 | while ((d = readdir(dir)) != NULL) { | |
138 | if (!filter || filter(name, d)) | |
139 | strlist__add(list, d->d_name); | |
140 | } | |
141 | ||
142 | out: | |
143 | closedir(dir); | |
144 | return list; | |
145 | } | |
146 | ||
f045b8c4 | 147 | static int slow_copyfile(const char *from, const char *to, struct nsinfo *nsi) |
9e201442 | 148 | { |
9a17d726 | 149 | int err = -1; |
9e201442 ACM |
150 | char *line = NULL; |
151 | size_t n; | |
f045b8c4 KJ |
152 | FILE *from_fp, *to_fp; |
153 | struct nscookie nsc; | |
9e201442 | 154 | |
f045b8c4 KJ |
155 | nsinfo__mountns_enter(nsi, &nsc); |
156 | from_fp = fopen(from, "r"); | |
157 | nsinfo__mountns_exit(&nsc); | |
9e201442 ACM |
158 | if (from_fp == NULL) |
159 | goto out; | |
160 | ||
161 | to_fp = fopen(to, "w"); | |
162 | if (to_fp == NULL) | |
163 | goto out_fclose_from; | |
164 | ||
165 | while (getline(&line, &n, from_fp) > 0) | |
166 | if (fputs(line, to_fp) == EOF) | |
167 | goto out_fclose_to; | |
168 | err = 0; | |
169 | out_fclose_to: | |
170 | fclose(to_fp); | |
171 | free(line); | |
172 | out_fclose_from: | |
173 | fclose(from_fp); | |
174 | out: | |
175 | return err; | |
176 | } | |
177 | ||
9c9f5a2f NK |
178 | int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size) |
179 | { | |
180 | void *ptr; | |
181 | loff_t pgoff; | |
182 | ||
183 | pgoff = off_in & ~(page_size - 1); | |
184 | off_in -= pgoff; | |
185 | ||
186 | ptr = mmap(NULL, off_in + size, PROT_READ, MAP_PRIVATE, ifd, pgoff); | |
187 | if (ptr == MAP_FAILED) | |
188 | return -1; | |
189 | ||
190 | while (size) { | |
191 | ssize_t ret = pwrite(ofd, ptr + off_in, size, off_out); | |
192 | if (ret < 0 && errno == EINTR) | |
193 | continue; | |
194 | if (ret <= 0) | |
195 | break; | |
196 | ||
197 | size -= ret; | |
198 | off_in += ret; | |
199 | off_out -= ret; | |
200 | } | |
201 | munmap(ptr, off_in + size); | |
202 | ||
203 | return size ? -1 : 0; | |
204 | } | |
205 | ||
f045b8c4 KJ |
206 | static int copyfile_mode_ns(const char *from, const char *to, mode_t mode, |
207 | struct nsinfo *nsi) | |
4cf40131 ACM |
208 | { |
209 | int fromfd, tofd; | |
210 | struct stat st; | |
f045b8c4 | 211 | int err; |
d7c72606 | 212 | char *tmp = NULL, *ptr = NULL; |
f045b8c4 | 213 | struct nscookie nsc; |
4cf40131 | 214 | |
f045b8c4 KJ |
215 | nsinfo__mountns_enter(nsi, &nsc); |
216 | err = stat(from, &st); | |
217 | nsinfo__mountns_exit(&nsc); | |
218 | if (err) | |
4cf40131 | 219 | goto out; |
f045b8c4 | 220 | err = -1; |
4cf40131 | 221 | |
d7c72606 MV |
222 | /* extra 'x' at the end is to reserve space for '.' */ |
223 | if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) { | |
224 | tmp = NULL; | |
4cf40131 | 225 | goto out; |
d7c72606 MV |
226 | } |
227 | ptr = strrchr(tmp, '/'); | |
228 | if (!ptr) | |
229 | goto out; | |
230 | ptr = memmove(ptr + 1, ptr, strlen(ptr) - 1); | |
231 | *ptr = '.'; | |
4cf40131 | 232 | |
d7c72606 | 233 | tofd = mkstemp(tmp); |
4cf40131 | 234 | if (tofd < 0) |
d7c72606 MV |
235 | goto out; |
236 | ||
237 | if (fchmod(tofd, mode)) | |
238 | goto out_close_to; | |
239 | ||
240 | if (st.st_size == 0) { /* /proc? do it slowly... */ | |
f045b8c4 | 241 | err = slow_copyfile(from, tmp, nsi); |
d7c72606 MV |
242 | goto out_close_to; |
243 | } | |
244 | ||
f045b8c4 | 245 | nsinfo__mountns_enter(nsi, &nsc); |
d7c72606 | 246 | fromfd = open(from, O_RDONLY); |
f045b8c4 | 247 | nsinfo__mountns_exit(&nsc); |
d7c72606 MV |
248 | if (fromfd < 0) |
249 | goto out_close_to; | |
4cf40131 | 250 | |
9c9f5a2f | 251 | err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size); |
4cf40131 | 252 | |
4cf40131 | 253 | close(fromfd); |
d7c72606 MV |
254 | out_close_to: |
255 | close(tofd); | |
256 | if (!err) | |
257 | err = link(tmp, to); | |
258 | unlink(tmp); | |
4cf40131 | 259 | out: |
d7c72606 | 260 | free(tmp); |
4cf40131 ACM |
261 | return err; |
262 | } | |
c82ee828 | 263 | |
f045b8c4 KJ |
264 | int copyfile_ns(const char *from, const char *to, struct nsinfo *nsi) |
265 | { | |
266 | return copyfile_mode_ns(from, to, 0755, nsi); | |
267 | } | |
268 | ||
269 | int copyfile_mode(const char *from, const char *to, mode_t mode) | |
270 | { | |
271 | return copyfile_mode_ns(from, to, mode, NULL); | |
272 | } | |
273 | ||
9a17d726 AH |
274 | int copyfile(const char *from, const char *to) |
275 | { | |
276 | return copyfile_mode(from, to, 0755); | |
277 | } | |
278 | ||
bc3a502b | 279 | static ssize_t ion(bool is_read, int fd, void *buf, size_t n) |
1e7972cc ACM |
280 | { |
281 | void *buf_start = buf; | |
838d1452 | 282 | size_t left = n; |
1e7972cc | 283 | |
838d1452 | 284 | while (left) { |
7c724405 | 285 | /* buf must be treated as const if !is_read. */ |
bc3a502b JO |
286 | ssize_t ret = is_read ? read(fd, buf, left) : |
287 | write(fd, buf, left); | |
1e7972cc | 288 | |
e148c760 NK |
289 | if (ret < 0 && errno == EINTR) |
290 | continue; | |
1e7972cc ACM |
291 | if (ret <= 0) |
292 | return ret; | |
293 | ||
838d1452 JO |
294 | left -= ret; |
295 | buf += ret; | |
1e7972cc ACM |
296 | } |
297 | ||
838d1452 JO |
298 | BUG_ON((size_t)(buf - buf_start) != n); |
299 | return n; | |
1e7972cc | 300 | } |
61e04b33 | 301 | |
bc3a502b JO |
302 | /* |
303 | * Read exactly 'n' bytes or return an error. | |
304 | */ | |
305 | ssize_t readn(int fd, void *buf, size_t n) | |
306 | { | |
307 | return ion(true, fd, buf, n); | |
308 | } | |
309 | ||
310 | /* | |
311 | * Write exactly 'n' bytes or return an error. | |
312 | */ | |
7c724405 | 313 | ssize_t writen(int fd, const void *buf, size_t n) |
bc3a502b | 314 | { |
7c724405 DCC |
315 | /* ion does not modify buf. */ |
316 | return ion(false, fd, (void *)buf, n); | |
bc3a502b JO |
317 | } |
318 | ||
61e04b33 ACM |
319 | size_t hex_width(u64 v) |
320 | { | |
321 | size_t n = 1; | |
322 | ||
323 | while ((v >>= 4)) | |
324 | ++n; | |
325 | ||
326 | return n; | |
327 | } | |
dc4552bf | 328 | |
b2aff5f6 JO |
329 | static int hex(char ch) |
330 | { | |
331 | if ((ch >= '0') && (ch <= '9')) | |
332 | return ch - '0'; | |
333 | if ((ch >= 'a') && (ch <= 'f')) | |
334 | return ch - 'a' + 10; | |
335 | if ((ch >= 'A') && (ch <= 'F')) | |
336 | return ch - 'A' + 10; | |
337 | return -1; | |
338 | } | |
339 | ||
340 | /* | |
341 | * While we find nice hex chars, build a long_val. | |
342 | * Return number of chars processed. | |
343 | */ | |
344 | int hex2u64(const char *ptr, u64 *long_val) | |
345 | { | |
346 | const char *p = ptr; | |
347 | *long_val = 0; | |
348 | ||
349 | while (*p) { | |
350 | const int hex_val = hex(*p); | |
351 | ||
352 | if (hex_val < 0) | |
353 | break; | |
354 | ||
355 | *long_val = (*long_val << 4) | hex_val; | |
356 | p++; | |
357 | } | |
358 | ||
359 | return p - ptr; | |
360 | } | |
361 | ||
1a47245d AH |
362 | int perf_event_paranoid(void) |
363 | { | |
1a47245d AH |
364 | int value; |
365 | ||
ce27309f | 366 | if (sysctl__read_int("kernel/perf_event_paranoid", &value)) |
1a47245d AH |
367 | return INT_MAX; |
368 | ||
369 | return value; | |
370 | } | |
d18acd15 WN |
371 | static int |
372 | fetch_ubuntu_kernel_version(unsigned int *puint) | |
373 | { | |
374 | ssize_t len; | |
375 | size_t line_len = 0; | |
376 | char *ptr, *line = NULL; | |
377 | int version, patchlevel, sublevel, err; | |
44b58e06 | 378 | FILE *vsig; |
d18acd15 | 379 | |
44b58e06 ACM |
380 | if (!puint) |
381 | return 0; | |
382 | ||
383 | vsig = fopen("/proc/version_signature", "r"); | |
d18acd15 WN |
384 | if (!vsig) { |
385 | pr_debug("Open /proc/version_signature failed: %s\n", | |
386 | strerror(errno)); | |
387 | return -1; | |
388 | } | |
389 | ||
390 | len = getline(&line, &line_len, vsig); | |
391 | fclose(vsig); | |
392 | err = -1; | |
393 | if (len <= 0) { | |
394 | pr_debug("Reading from /proc/version_signature failed: %s\n", | |
395 | strerror(errno)); | |
396 | goto errout; | |
397 | } | |
398 | ||
399 | ptr = strrchr(line, ' '); | |
400 | if (!ptr) { | |
401 | pr_debug("Parsing /proc/version_signature failed: %s\n", line); | |
402 | goto errout; | |
403 | } | |
404 | ||
405 | err = sscanf(ptr + 1, "%d.%d.%d", | |
406 | &version, &patchlevel, &sublevel); | |
407 | if (err != 3) { | |
408 | pr_debug("Unable to get kernel version from /proc/version_signature '%s'\n", | |
409 | line); | |
410 | goto errout; | |
411 | } | |
412 | ||
44b58e06 | 413 | *puint = (version << 16) + (patchlevel << 8) + sublevel; |
d18acd15 WN |
414 | err = 0; |
415 | errout: | |
416 | free(line); | |
417 | return err; | |
418 | } | |
419 | ||
07bc5c69 WN |
420 | int |
421 | fetch_kernel_version(unsigned int *puint, char *str, | |
422 | size_t str_size) | |
423 | { | |
424 | struct utsname utsname; | |
425 | int version, patchlevel, sublevel, err; | |
d18acd15 WN |
426 | bool int_ver_ready = false; |
427 | ||
428 | if (access("/proc/version_signature", R_OK) == 0) | |
429 | if (!fetch_ubuntu_kernel_version(puint)) | |
430 | int_ver_ready = true; | |
07bc5c69 WN |
431 | |
432 | if (uname(&utsname)) | |
433 | return -1; | |
434 | ||
435 | if (str && str_size) { | |
436 | strncpy(str, utsname.release, str_size); | |
437 | str[str_size - 1] = '\0'; | |
438 | } | |
439 | ||
44b58e06 ACM |
440 | if (!puint || int_ver_ready) |
441 | return 0; | |
442 | ||
07bc5c69 WN |
443 | err = sscanf(utsname.release, "%d.%d.%d", |
444 | &version, &patchlevel, &sublevel); | |
445 | ||
446 | if (err != 3) { | |
d18acd15 | 447 | pr_debug("Unable to get kernel version from uname '%s'\n", |
07bc5c69 WN |
448 | utsname.release); |
449 | return -1; | |
450 | } | |
451 | ||
44b58e06 | 452 | *puint = (version << 16) + (patchlevel << 8) + sublevel; |
07bc5c69 WN |
453 | return 0; |
454 | } | |
14cbfbeb NK |
455 | |
456 | const char *perf_tip(const char *dirpath) | |
457 | { | |
458 | struct strlist *tips; | |
459 | struct str_node *node; | |
460 | char *tip = NULL; | |
461 | struct strlist_config conf = { | |
34b7b0f9 NK |
462 | .dirname = dirpath, |
463 | .file_only = true, | |
14cbfbeb NK |
464 | }; |
465 | ||
466 | tips = strlist__new("tips.txt", &conf); | |
34b7b0f9 | 467 | if (tips == NULL) |
570eda03 DCC |
468 | return errno == ENOENT ? NULL : |
469 | "Tip: check path of tips.txt or get more memory! ;-p"; | |
34b7b0f9 NK |
470 | |
471 | if (strlist__nr_entries(tips) == 0) | |
14cbfbeb | 472 | goto out; |
14cbfbeb NK |
473 | |
474 | node = strlist__entry(tips, random() % strlist__nr_entries(tips)); | |
475 | if (asprintf(&tip, "Tip: %s", node->s) < 0) | |
476 | tip = (char *)"Tip: get more memory! ;-)"; | |
477 | ||
478 | out: | |
479 | strlist__delete(tips); | |
480 | ||
481 | return tip; | |
482 | } |