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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/perf/util/util.c | |
parent | Initial commit. (diff) | |
download | linux-upstream/5.10.209.tar.xz linux-upstream/5.10.209.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | tools/perf/util/util.c | 418 |
1 files changed, 418 insertions, 0 deletions
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c new file mode 100644 index 000000000..df3c4671b --- /dev/null +++ b/tools/perf/util/util.c @@ -0,0 +1,418 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "util.h" +#include "debug.h" +#include "event.h" +#include <api/fs/fs.h> +#include <sys/stat.h> +#include <sys/utsname.h> +#include <dirent.h> +#include <fcntl.h> +#include <inttypes.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> +#include <limits.h> +#include <linux/capability.h> +#include <linux/kernel.h> +#include <linux/log2.h> +#include <linux/time64.h> +#include <unistd.h> +#include "cap.h" +#include "strlist.h" +#include "string2.h" + +/* + * XXX We need to find a better place for these things... + */ + +bool perf_singlethreaded = true; + +void perf_set_singlethreaded(void) +{ + perf_singlethreaded = true; +} + +void perf_set_multithreaded(void) +{ + perf_singlethreaded = false; +} + +int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH; +int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK; + +int sysctl__max_stack(void) +{ + int value; + + if (sysctl__read_int("kernel/perf_event_max_stack", &value) == 0) + sysctl_perf_event_max_stack = value; + + if (sysctl__read_int("kernel/perf_event_max_contexts_per_stack", &value) == 0) + sysctl_perf_event_max_contexts_per_stack = value; + + return sysctl_perf_event_max_stack; +} + +bool sysctl__nmi_watchdog_enabled(void) +{ + static bool cached; + static bool nmi_watchdog; + int value; + + if (cached) + return nmi_watchdog; + + if (sysctl__read_int("kernel/nmi_watchdog", &value) < 0) + return false; + + nmi_watchdog = (value > 0) ? true : false; + cached = true; + + return nmi_watchdog; +} + +bool test_attr__enabled; + +bool perf_host = true; +bool perf_guest = false; + +void event_attr_init(struct perf_event_attr *attr) +{ + if (!perf_host) + attr->exclude_host = 1; + if (!perf_guest) + attr->exclude_guest = 1; + /* to capture ABI version */ + attr->size = sizeof(*attr); +} + +int mkdir_p(char *path, mode_t mode) +{ + struct stat st; + int err; + char *d = path; + + if (*d != '/') + return -1; + + if (stat(path, &st) == 0) + return 0; + + while (*++d == '/'); + + while ((d = strchr(d, '/'))) { + *d = '\0'; + err = stat(path, &st) && mkdir(path, mode); + *d++ = '/'; + if (err) + return -1; + while (*d == '/') + ++d; + } + return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0; +} + +static bool match_pat(char *file, const char **pat) +{ + int i = 0; + + if (!pat) + return true; + + while (pat[i]) { + if (strglobmatch(file, pat[i])) + return true; + + i++; + } + + return false; +} + +/* + * The depth specify how deep the removal will go. + * 0 - will remove only files under the 'path' directory + * 1 .. x - will dive in x-level deep under the 'path' directory + * + * If specified the pat is array of string patterns ended with NULL, + * which are checked upon every file/directory found. Only matching + * ones are removed. + * + * The function returns: + * 0 on success + * -1 on removal failure with errno set + * -2 on pattern failure + */ +static int rm_rf_depth_pat(const char *path, int depth, const char **pat) +{ + DIR *dir; + int ret; + struct dirent *d; + char namebuf[PATH_MAX]; + struct stat statbuf; + + /* Do not fail if there's no file. */ + ret = lstat(path, &statbuf); + if (ret) + return 0; + + /* Try to remove any file we get. */ + if (!(statbuf.st_mode & S_IFDIR)) + return unlink(path); + + /* We have directory in path. */ + dir = opendir(path); + if (dir == NULL) + return -1; + + while ((d = readdir(dir)) != NULL && !ret) { + + if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, "..")) + continue; + + if (!match_pat(d->d_name, pat)) { + ret = -2; + break; + } + + scnprintf(namebuf, sizeof(namebuf), "%s/%s", + path, d->d_name); + + /* We have to check symbolic link itself */ + ret = lstat(namebuf, &statbuf); + if (ret < 0) { + pr_debug("stat failed: %s\n", namebuf); + break; + } + + if (S_ISDIR(statbuf.st_mode)) + ret = depth ? rm_rf_depth_pat(namebuf, depth - 1, pat) : 0; + else + ret = unlink(namebuf); + } + closedir(dir); + + if (ret < 0) + return ret; + + return rmdir(path); +} + +static int rm_rf_kcore_dir(const char *path) +{ + char kcore_dir_path[PATH_MAX]; + const char *pat[] = { + "kcore", + "kallsyms", + "modules", + NULL, + }; + + snprintf(kcore_dir_path, sizeof(kcore_dir_path), "%s/kcore_dir", path); + + return rm_rf_depth_pat(kcore_dir_path, 0, pat); +} + +int rm_rf_perf_data(const char *path) +{ + const char *pat[] = { + "data", + "data.*", + NULL, + }; + + rm_rf_kcore_dir(path); + + return rm_rf_depth_pat(path, 0, pat); +} + +int rm_rf(const char *path) +{ + return rm_rf_depth_pat(path, INT_MAX, NULL); +} + +/* A filter which removes dot files */ +bool lsdir_no_dot_filter(const char *name __maybe_unused, struct dirent *d) +{ + return d->d_name[0] != '.'; +} + +/* lsdir reads a directory and store it in strlist */ +struct strlist *lsdir(const char *name, + bool (*filter)(const char *, struct dirent *)) +{ + struct strlist *list = NULL; + DIR *dir; + struct dirent *d; + + dir = opendir(name); + if (!dir) + return NULL; + + list = strlist__new(NULL, NULL); + if (!list) { + errno = ENOMEM; + goto out; + } + + while ((d = readdir(dir)) != NULL) { + if (!filter || filter(name, d)) + strlist__add(list, d->d_name); + } + +out: + closedir(dir); + return list; +} + +size_t hex_width(u64 v) +{ + size_t n = 1; + + while ((v >>= 4)) + ++n; + + return n; +} + +int perf_event_paranoid(void) +{ + int value; + + if (sysctl__read_int("kernel/perf_event_paranoid", &value)) + return INT_MAX; + + return value; +} + +bool perf_event_paranoid_check(int max_level) +{ + return perf_cap__capable(CAP_SYS_ADMIN) || + perf_cap__capable(CAP_PERFMON) || + perf_event_paranoid() <= max_level; +} + +static int +fetch_ubuntu_kernel_version(unsigned int *puint) +{ + ssize_t len; + size_t line_len = 0; + char *ptr, *line = NULL; + int version, patchlevel, sublevel, err; + FILE *vsig; + + if (!puint) + return 0; + + vsig = fopen("/proc/version_signature", "r"); + if (!vsig) { + pr_debug("Open /proc/version_signature failed: %s\n", + strerror(errno)); + return -1; + } + + len = getline(&line, &line_len, vsig); + fclose(vsig); + err = -1; + if (len <= 0) { + pr_debug("Reading from /proc/version_signature failed: %s\n", + strerror(errno)); + goto errout; + } + + ptr = strrchr(line, ' '); + if (!ptr) { + pr_debug("Parsing /proc/version_signature failed: %s\n", line); + goto errout; + } + + err = sscanf(ptr + 1, "%d.%d.%d", + &version, &patchlevel, &sublevel); + if (err != 3) { + pr_debug("Unable to get kernel version from /proc/version_signature '%s'\n", + line); + goto errout; + } + + *puint = (version << 16) + (patchlevel << 8) + sublevel; + err = 0; +errout: + free(line); + return err; +} + +int +fetch_kernel_version(unsigned int *puint, char *str, + size_t str_size) +{ + struct utsname utsname; + int version, patchlevel, sublevel, err; + bool int_ver_ready = false; + + if (access("/proc/version_signature", R_OK) == 0) + if (!fetch_ubuntu_kernel_version(puint)) + int_ver_ready = true; + + if (uname(&utsname)) + return -1; + + if (str && str_size) { + strncpy(str, utsname.release, str_size); + str[str_size - 1] = '\0'; + } + + if (!puint || int_ver_ready) + return 0; + + err = sscanf(utsname.release, "%d.%d.%d", + &version, &patchlevel, &sublevel); + + if (err != 3) { + pr_debug("Unable to get kernel version from uname '%s'\n", + utsname.release); + return -1; + } + + *puint = (version << 16) + (patchlevel << 8) + sublevel; + return 0; +} + +int perf_tip(char **strp, const char *dirpath) +{ + struct strlist *tips; + struct str_node *node; + struct strlist_config conf = { + .dirname = dirpath, + .file_only = true, + }; + int ret = 0; + + *strp = NULL; + tips = strlist__new("tips.txt", &conf); + if (tips == NULL) + return -errno; + + if (strlist__nr_entries(tips) == 0) + goto out; + + node = strlist__entry(tips, random() % strlist__nr_entries(tips)); + if (asprintf(strp, "Tip: %s", node->s) < 0) + ret = -ENOMEM; + +out: + strlist__delete(tips); + + return ret; +} + +char *perf_exe(char *buf, int len) +{ + int n = readlink("/proc/self/exe", buf, len); + if (n > 0) { + buf[n] = 0; + return buf; + } + return strcpy(buf, "perf"); +} |