1 // SPDX-License-Identifier: GPL-2.0
7 #include <sys/utsname.h>
17 #include <linux/capability.h>
18 #include <linux/kernel.h>
19 #include <linux/log2.h>
20 #include <linux/time64.h>
27 * XXX We need to find a better place for these things...
30 bool perf_singlethreaded = true;
32 void perf_set_singlethreaded(void)
34 perf_singlethreaded = true;
37 void perf_set_multithreaded(void)
39 perf_singlethreaded = false;
42 int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH;
43 int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK;
45 int sysctl__max_stack(void)
49 if (sysctl__read_int("kernel/perf_event_max_stack", &value) == 0)
50 sysctl_perf_event_max_stack = value;
52 if (sysctl__read_int("kernel/perf_event_max_contexts_per_stack", &value) == 0)
53 sysctl_perf_event_max_contexts_per_stack = value;
55 return sysctl_perf_event_max_stack;
58 bool test_attr__enabled;
60 bool perf_host = true;
61 bool perf_guest = false;
63 void event_attr_init(struct perf_event_attr *attr)
66 attr->exclude_host = 1;
68 attr->exclude_guest = 1;
69 /* to capture ABI version */
70 attr->size = sizeof(*attr);
73 int mkdir_p(char *path, mode_t mode)
82 if (stat(path, &st) == 0)
87 while ((d = strchr(d, '/'))) {
89 err = stat(path, &st) && mkdir(path, mode);
96 return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
99 static bool match_pat(char *file, const char **pat)
107 if (strglobmatch(file, pat[i]))
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
121 * If specified the pat is array of string patterns ended with NULL,
122 * which are checked upon every file/directory found. Only matching
125 * The function returns:
127 * -1 on removal failure with errno set
128 * -2 on pattern failure
130 static int rm_rf_depth_pat(const char *path, int depth, const char **pat)
135 char namebuf[PATH_MAX];
138 /* Do not fail if there's no file. */
139 ret = lstat(path, &statbuf);
143 /* Try to remove any file we get. */
144 if (!(statbuf.st_mode & S_IFDIR))
147 /* We have directory in path. */
152 while ((d = readdir(dir)) != NULL && !ret) {
154 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
157 if (!match_pat(d->d_name, pat)) {
162 scnprintf(namebuf, sizeof(namebuf), "%s/%s",
165 /* We have to check symbolic link itself */
166 ret = lstat(namebuf, &statbuf);
168 pr_debug("stat failed: %s\n", namebuf);
172 if (S_ISDIR(statbuf.st_mode))
173 ret = depth ? rm_rf_depth_pat(namebuf, depth - 1, pat) : 0;
175 ret = unlink(namebuf);
185 static int rm_rf_kcore_dir(const char *path)
187 char kcore_dir_path[PATH_MAX];
188 const char *pat[] = {
195 snprintf(kcore_dir_path, sizeof(kcore_dir_path), "%s/kcore_dir", path);
197 return rm_rf_depth_pat(kcore_dir_path, 0, pat);
200 int rm_rf_perf_data(const char *path)
202 const char *pat[] = {
208 rm_rf_kcore_dir(path);
210 return rm_rf_depth_pat(path, 0, pat);
213 int rm_rf(const char *path)
215 return rm_rf_depth_pat(path, INT_MAX, NULL);
218 /* A filter which removes dot files */
219 bool lsdir_no_dot_filter(const char *name __maybe_unused, struct dirent *d)
221 return d->d_name[0] != '.';
224 /* lsdir reads a directory and store it in strlist */
225 struct strlist *lsdir(const char *name,
226 bool (*filter)(const char *, struct dirent *))
228 struct strlist *list = NULL;
236 list = strlist__new(NULL, NULL);
242 while ((d = readdir(dir)) != NULL) {
243 if (!filter || filter(name, d))
244 strlist__add(list, d->d_name);
252 size_t hex_width(u64 v)
262 int perf_event_paranoid(void)
266 if (sysctl__read_int("kernel/perf_event_paranoid", &value))
272 bool perf_event_paranoid_check(int max_level)
274 return perf_cap__capable(CAP_SYS_ADMIN) ||
275 perf_event_paranoid() <= max_level;
279 fetch_ubuntu_kernel_version(unsigned int *puint)
283 char *ptr, *line = NULL;
284 int version, patchlevel, sublevel, err;
290 vsig = fopen("/proc/version_signature", "r");
292 pr_debug("Open /proc/version_signature failed: %s\n",
297 len = getline(&line, &line_len, vsig);
301 pr_debug("Reading from /proc/version_signature failed: %s\n",
306 ptr = strrchr(line, ' ');
308 pr_debug("Parsing /proc/version_signature failed: %s\n", line);
312 err = sscanf(ptr + 1, "%d.%d.%d",
313 &version, &patchlevel, &sublevel);
315 pr_debug("Unable to get kernel version from /proc/version_signature '%s'\n",
320 *puint = (version << 16) + (patchlevel << 8) + sublevel;
328 fetch_kernel_version(unsigned int *puint, char *str,
331 struct utsname utsname;
332 int version, patchlevel, sublevel, err;
333 bool int_ver_ready = false;
335 if (access("/proc/version_signature", R_OK) == 0)
336 if (!fetch_ubuntu_kernel_version(puint))
337 int_ver_ready = true;
342 if (str && str_size) {
343 strncpy(str, utsname.release, str_size);
344 str[str_size - 1] = '\0';
347 if (!puint || int_ver_ready)
350 err = sscanf(utsname.release, "%d.%d.%d",
351 &version, &patchlevel, &sublevel);
354 pr_debug("Unable to get kernel version from uname '%s'\n",
359 *puint = (version << 16) + (patchlevel << 8) + sublevel;
363 const char *perf_tip(const char *dirpath)
365 struct strlist *tips;
366 struct str_node *node;
368 struct strlist_config conf = {
373 tips = strlist__new("tips.txt", &conf);
375 return errno == ENOENT ? NULL :
376 "Tip: check path of tips.txt or get more memory! ;-p";
378 if (strlist__nr_entries(tips) == 0)
381 node = strlist__entry(tips, random() % strlist__nr_entries(tips));
382 if (asprintf(&tip, "Tip: %s", node->s) < 0)
383 tip = (char *)"Tip: get more memory! ;-)";
386 strlist__delete(tips);
391 char *perf_exe(char *buf, int len)
393 int n = readlink("/proc/self/exe", buf, len);
398 return strcpy(buf, "perf");