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