Loading...
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// SPDX-License-Identifier: GPL-2.0
2#include "util.h"
3#include "debug.h"
4#include "event.h"
5#include <api/fs/fs.h>
6#include <sys/stat.h>
7#include <sys/utsname.h>
8#include <dirent.h>
9#include <fcntl.h>
10#include <inttypes.h>
11#include <signal.h>
12#include <stdio.h>
13#include <stdlib.h>
14#include <string.h>
15#include <errno.h>
16#include <limits.h>
17#include <linux/capability.h>
18#include <linux/kernel.h>
19#include <linux/log2.h>
20#include <linux/time64.h>
21#include <unistd.h>
22#include "cap.h"
23#include "strlist.h"
24#include "string2.h"
25
26/*
27 * XXX We need to find a better place for these things...
28 */
29
30bool perf_singlethreaded = true;
31
32void perf_set_singlethreaded(void)
33{
34 perf_singlethreaded = true;
35}
36
37void perf_set_multithreaded(void)
38{
39 perf_singlethreaded = false;
40}
41
42int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH;
43int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK;
44
45int sysctl__max_stack(void)
46{
47 int value;
48
49 if (sysctl__read_int("kernel/perf_event_max_stack", &value) == 0)
50 sysctl_perf_event_max_stack = value;
51
52 if (sysctl__read_int("kernel/perf_event_max_contexts_per_stack", &value) == 0)
53 sysctl_perf_event_max_contexts_per_stack = value;
54
55 return sysctl_perf_event_max_stack;
56}
57
58bool sysctl__nmi_watchdog_enabled(void)
59{
60 static bool cached;
61 static bool nmi_watchdog;
62 int value;
63
64 if (cached)
65 return nmi_watchdog;
66
67 if (sysctl__read_int("kernel/nmi_watchdog", &value) < 0)
68 return false;
69
70 nmi_watchdog = (value > 0) ? true : false;
71 cached = true;
72
73 return nmi_watchdog;
74}
75
76bool test_attr__enabled;
77
78bool perf_host = true;
79bool perf_guest = false;
80
81void event_attr_init(struct perf_event_attr *attr)
82{
83 if (!perf_host)
84 attr->exclude_host = 1;
85 if (!perf_guest)
86 attr->exclude_guest = 1;
87 /* to capture ABI version */
88 attr->size = sizeof(*attr);
89}
90
91int mkdir_p(char *path, mode_t mode)
92{
93 struct stat st;
94 int err;
95 char *d = path;
96
97 if (*d != '/')
98 return -1;
99
100 if (stat(path, &st) == 0)
101 return 0;
102
103 while (*++d == '/');
104
105 while ((d = strchr(d, '/'))) {
106 *d = '\0';
107 err = stat(path, &st) && mkdir(path, mode);
108 *d++ = '/';
109 if (err)
110 return -1;
111 while (*d == '/')
112 ++d;
113 }
114 return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
115}
116
117static bool match_pat(char *file, const char **pat)
118{
119 int i = 0;
120
121 if (!pat)
122 return true;
123
124 while (pat[i]) {
125 if (strglobmatch(file, pat[i]))
126 return true;
127
128 i++;
129 }
130
131 return false;
132}
133
134/*
135 * The depth specify how deep the removal will go.
136 * 0 - will remove only files under the 'path' directory
137 * 1 .. x - will dive in x-level deep under the 'path' directory
138 *
139 * If specified the pat is array of string patterns ended with NULL,
140 * which are checked upon every file/directory found. Only matching
141 * ones are removed.
142 *
143 * The function returns:
144 * 0 on success
145 * -1 on removal failure with errno set
146 * -2 on pattern failure
147 */
148static int rm_rf_depth_pat(const char *path, int depth, const char **pat)
149{
150 DIR *dir;
151 int ret;
152 struct dirent *d;
153 char namebuf[PATH_MAX];
154 struct stat statbuf;
155
156 /* Do not fail if there's no file. */
157 ret = lstat(path, &statbuf);
158 if (ret)
159 return 0;
160
161 /* Try to remove any file we get. */
162 if (!(statbuf.st_mode & S_IFDIR))
163 return unlink(path);
164
165 /* We have directory in path. */
166 dir = opendir(path);
167 if (dir == NULL)
168 return -1;
169
170 while ((d = readdir(dir)) != NULL && !ret) {
171
172 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
173 continue;
174
175 if (!match_pat(d->d_name, pat)) {
176 ret = -2;
177 break;
178 }
179
180 scnprintf(namebuf, sizeof(namebuf), "%s/%s",
181 path, d->d_name);
182
183 /* We have to check symbolic link itself */
184 ret = lstat(namebuf, &statbuf);
185 if (ret < 0) {
186 pr_debug("stat failed: %s\n", namebuf);
187 break;
188 }
189
190 if (S_ISDIR(statbuf.st_mode))
191 ret = depth ? rm_rf_depth_pat(namebuf, depth - 1, pat) : 0;
192 else
193 ret = unlink(namebuf);
194 }
195 closedir(dir);
196
197 if (ret < 0)
198 return ret;
199
200 return rmdir(path);
201}
202
203static int rm_rf_kcore_dir(const char *path)
204{
205 char kcore_dir_path[PATH_MAX];
206 const char *pat[] = {
207 "kcore",
208 "kallsyms",
209 "modules",
210 NULL,
211 };
212
213 snprintf(kcore_dir_path, sizeof(kcore_dir_path), "%s/kcore_dir", path);
214
215 return rm_rf_depth_pat(kcore_dir_path, 0, pat);
216}
217
218int rm_rf_perf_data(const char *path)
219{
220 const char *pat[] = {
221 "data",
222 "data.*",
223 NULL,
224 };
225
226 rm_rf_kcore_dir(path);
227
228 return rm_rf_depth_pat(path, 0, pat);
229}
230
231int rm_rf(const char *path)
232{
233 return rm_rf_depth_pat(path, INT_MAX, NULL);
234}
235
236/* A filter which removes dot files */
237bool lsdir_no_dot_filter(const char *name __maybe_unused, struct dirent *d)
238{
239 return d->d_name[0] != '.';
240}
241
242/* lsdir reads a directory and store it in strlist */
243struct strlist *lsdir(const char *name,
244 bool (*filter)(const char *, struct dirent *))
245{
246 struct strlist *list = NULL;
247 DIR *dir;
248 struct dirent *d;
249
250 dir = opendir(name);
251 if (!dir)
252 return NULL;
253
254 list = strlist__new(NULL, NULL);
255 if (!list) {
256 errno = ENOMEM;
257 goto out;
258 }
259
260 while ((d = readdir(dir)) != NULL) {
261 if (!filter || filter(name, d))
262 strlist__add(list, d->d_name);
263 }
264
265out:
266 closedir(dir);
267 return list;
268}
269
270size_t hex_width(u64 v)
271{
272 size_t n = 1;
273
274 while ((v >>= 4))
275 ++n;
276
277 return n;
278}
279
280int perf_event_paranoid(void)
281{
282 int value;
283
284 if (sysctl__read_int("kernel/perf_event_paranoid", &value))
285 return INT_MAX;
286
287 return value;
288}
289
290bool perf_event_paranoid_check(int max_level)
291{
292 return perf_cap__capable(CAP_SYS_ADMIN) ||
293 perf_cap__capable(CAP_PERFMON) ||
294 perf_event_paranoid() <= max_level;
295}
296
297static int
298fetch_ubuntu_kernel_version(unsigned int *puint)
299{
300 ssize_t len;
301 size_t line_len = 0;
302 char *ptr, *line = NULL;
303 int version, patchlevel, sublevel, err;
304 FILE *vsig;
305
306 if (!puint)
307 return 0;
308
309 vsig = fopen("/proc/version_signature", "r");
310 if (!vsig) {
311 pr_debug("Open /proc/version_signature failed: %s\n",
312 strerror(errno));
313 return -1;
314 }
315
316 len = getline(&line, &line_len, vsig);
317 fclose(vsig);
318 err = -1;
319 if (len <= 0) {
320 pr_debug("Reading from /proc/version_signature failed: %s\n",
321 strerror(errno));
322 goto errout;
323 }
324
325 ptr = strrchr(line, ' ');
326 if (!ptr) {
327 pr_debug("Parsing /proc/version_signature failed: %s\n", line);
328 goto errout;
329 }
330
331 err = sscanf(ptr + 1, "%d.%d.%d",
332 &version, &patchlevel, &sublevel);
333 if (err != 3) {
334 pr_debug("Unable to get kernel version from /proc/version_signature '%s'\n",
335 line);
336 goto errout;
337 }
338
339 *puint = (version << 16) + (patchlevel << 8) + sublevel;
340 err = 0;
341errout:
342 free(line);
343 return err;
344}
345
346int
347fetch_kernel_version(unsigned int *puint, char *str,
348 size_t str_size)
349{
350 struct utsname utsname;
351 int version, patchlevel, sublevel, err;
352 bool int_ver_ready = false;
353
354 if (access("/proc/version_signature", R_OK) == 0)
355 if (!fetch_ubuntu_kernel_version(puint))
356 int_ver_ready = true;
357
358 if (uname(&utsname))
359 return -1;
360
361 if (str && str_size) {
362 strncpy(str, utsname.release, str_size);
363 str[str_size - 1] = '\0';
364 }
365
366 if (!puint || int_ver_ready)
367 return 0;
368
369 err = sscanf(utsname.release, "%d.%d.%d",
370 &version, &patchlevel, &sublevel);
371
372 if (err != 3) {
373 pr_debug("Unable to get kernel version from uname '%s'\n",
374 utsname.release);
375 return -1;
376 }
377
378 *puint = (version << 16) + (patchlevel << 8) + sublevel;
379 return 0;
380}
381
382const char *perf_tip(const char *dirpath)
383{
384 struct strlist *tips;
385 struct str_node *node;
386 char *tip = NULL;
387 struct strlist_config conf = {
388 .dirname = dirpath,
389 .file_only = true,
390 };
391
392 tips = strlist__new("tips.txt", &conf);
393 if (tips == NULL)
394 return errno == ENOENT ? NULL :
395 "Tip: check path of tips.txt or get more memory! ;-p";
396
397 if (strlist__nr_entries(tips) == 0)
398 goto out;
399
400 node = strlist__entry(tips, random() % strlist__nr_entries(tips));
401 if (asprintf(&tip, "Tip: %s", node->s) < 0)
402 tip = (char *)"Tip: get more memory! ;-)";
403
404out:
405 strlist__delete(tips);
406
407 return tip;
408}
409
410char *perf_exe(char *buf, int len)
411{
412 int n = readlink("/proc/self/exe", buf, len);
413 if (n > 0) {
414 buf[n] = 0;
415 return buf;
416 }
417 return strcpy(buf, "perf");
418}