1 files changed, 178 insertions, 96 deletions

diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 37a9492edb3e..0f031eb80b4c 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -18,6 +18,7 @@
 #include <linux/kernel.h>
 #include <linux/log2.h>
 #include <linux/time64.h>
+#include <linux/overflow.h>
 #include <unistd.h>
 #include "cap.h"
 #include "strlist.h"
@@ -27,6 +28,8 @@
  * XXX We need to find a better place for these things...
  */
 
+const char *input_name;
+
 bool perf_singlethreaded = true;
 
 void perf_set_singlethreaded(void)
@@ -75,17 +78,23 @@ bool sysctl__nmi_watchdog_enabled(void)
 
 bool test_attr__enabled;
 
+bool exclude_GH_default;
+
 bool perf_host  = true;
 bool perf_guest = false;
 
 void event_attr_init(struct perf_event_attr *attr)
 {
+	/* to capture ABI version */
+	attr->size = sizeof(*attr);
+
+	if (!exclude_GH_default)
+		return;
+
 	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)
@@ -200,7 +209,7 @@ static int rm_rf_depth_pat(const char *path, int depth, const char **pat)
 	return rmdir(path);
 }
 
-static int rm_rf_kcore_dir(const char *path)
+static int rm_rf_a_kcore_dir(const char *path, const char *name)
 {
 	char kcore_dir_path[PATH_MAX];
 	const char *pat[] = {
@@ -210,11 +219,44 @@ static int rm_rf_kcore_dir(const char *path)
 		NULL,
 	};
 
-	snprintf(kcore_dir_path, sizeof(kcore_dir_path), "%s/kcore_dir", path);
+	snprintf(kcore_dir_path, sizeof(kcore_dir_path), "%s/%s", path, name);
 
 	return rm_rf_depth_pat(kcore_dir_path, 0, pat);
 }
 
+static bool kcore_dir_filter(const char *name __maybe_unused, struct dirent *d)
+{
+	const char *pat[] = {
+		"kcore_dir",
+		"kcore_dir__[1-9]*",
+		NULL,
+	};
+
+	return match_pat(d->d_name, pat);
+}
+
+static int rm_rf_kcore_dir(const char *path)
+{
+	struct strlist *kcore_dirs;
+	struct str_node *nd;
+	int ret;
+
+	kcore_dirs = lsdir(path, kcore_dir_filter);
+
+	if (!kcore_dirs)
+		return 0;
+
+	strlist__for_each_entry(nd, kcore_dirs) {
+		ret = rm_rf_a_kcore_dir(path, nd->s);
+		if (ret)
+			return ret;
+	}
+
+	strlist__delete(kcore_dirs);
+
+	return 0;
+}
+
 int rm_rf_perf_data(const char *path)
 {
 	const char *pat[] = {
@@ -289,122 +331,43 @@ int perf_event_paranoid(void)
 
 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;
+	bool used_root;
 
-	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 (perf_cap__capable(CAP_SYS_ADMIN, &used_root))
+		return true;
 
-	if (err != 3) {
-		pr_debug("Unable to get kernel version from uname '%s'\n",
-			 utsname.release);
-		return -1;
-	}
+	if (!used_root && perf_cap__capable(CAP_PERFMON, &used_root))
+		return true;
 
-	*puint = (version << 16) + (patchlevel << 8) + sublevel;
-	return 0;
+	return perf_event_paranoid() <= max_level;
 }
 
-const char *perf_tip(const char *dirpath)
+int perf_tip(char **strp, const char *dirpath)
 {
 	struct strlist *tips;
 	struct str_node *node;
-	char *tip = NULL;
 	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 == ENOENT ? NULL :
-			"Tip: check path of tips.txt or get more memory! ;-p";
+		return -errno;
 
 	if (strlist__nr_entries(tips) == 0)
 		goto out;
 
 	node = strlist__entry(tips, random() % strlist__nr_entries(tips));
-	if (asprintf(&tip, "Tip: %s", node->s) < 0)
-		tip = (char *)"Tip: get more memory! ;-)";
+	if (asprintf(strp, "Tip: %s", node->s) < 0)
+		ret = -ENOMEM;
 
 out:
 	strlist__delete(tips);
 
-	return tip;
+	return ret;
 }
 
 char *perf_exe(char *buf, int len)
@@ -416,3 +379,122 @@ char *perf_exe(char *buf, int len)
 	}
 	return strcpy(buf, "perf");
 }
+
+void perf_debuginfod_setup(struct perf_debuginfod *di)
+{
+	/*
+	 * By default '!di->set' we clear DEBUGINFOD_URLS, so debuginfod
+	 * processing is not triggered, otherwise we set it to 'di->urls'
+	 * value. If 'di->urls' is "system" we keep DEBUGINFOD_URLS value.
+	 */
+	if (!di->set)
+		setenv("DEBUGINFOD_URLS", "", 1);
+	else if (di->urls && strcmp(di->urls, "system"))
+		setenv("DEBUGINFOD_URLS", di->urls, 1);
+
+	pr_debug("DEBUGINFOD_URLS=%s\n", getenv("DEBUGINFOD_URLS"));
+
+#ifndef HAVE_DEBUGINFOD_SUPPORT
+	if (di->set)
+		pr_warning("WARNING: debuginfod support requested, but perf is not built with it\n");
+#endif
+}
+
+/*
+ * Return a new filename prepended with task's root directory if it's in
+ * a chroot.  Callers should free the returned string.
+ */
+char *filename_with_chroot(int pid, const char *filename)
+{
+	char buf[PATH_MAX];
+	char proc_root[32];
+	char *new_name = NULL;
+	int ret;
+
+	scnprintf(proc_root, sizeof(proc_root), "/proc/%d/root", pid);
+	ret = readlink(proc_root, buf, sizeof(buf) - 1);
+	if (ret <= 0)
+		return NULL;
+
+	/* readlink(2) does not append a null byte to buf */
+	buf[ret] = '\0';
+
+	if (!strcmp(buf, "/"))
+		return NULL;
+
+	if (strstr(buf, "(deleted)"))
+		return NULL;
+
+	if (asprintf(&new_name, "%s/%s", buf, filename) < 0)
+		return NULL;
+
+	return new_name;
+}
+
+/*
+ * Reallocate an array *arr of size *arr_sz so that it is big enough to contain
+ * x elements of size msz, initializing new entries to *init_val or zero if
+ * init_val is NULL
+ */
+int do_realloc_array_as_needed(void **arr, size_t *arr_sz, size_t x, size_t msz, const void *init_val)
+{
+	size_t new_sz = *arr_sz;
+	void *new_arr;
+	size_t i;
+
+	if (!new_sz)
+		new_sz = msz >= 64 ? 1 : roundup(64, msz); /* Start with at least 64 bytes */
+	while (x >= new_sz) {
+		if (check_mul_overflow(new_sz, (size_t)2, &new_sz))
+			return -ENOMEM;
+	}
+	if (new_sz == *arr_sz)
+		return 0;
+	new_arr = calloc(new_sz, msz);
+	if (!new_arr)
+		return -ENOMEM;
+	if (*arr_sz)
+		memcpy(new_arr, *arr, *arr_sz * msz);
+	if (init_val) {
+		for (i = *arr_sz; i < new_sz; i++)
+			memcpy(new_arr + (i * msz), init_val, msz);
+	}
+	*arr = new_arr;
+	*arr_sz = new_sz;
+	return 0;
+}
+
+#ifndef HAVE_SCHED_GETCPU_SUPPORT
+int sched_getcpu(void)
+{
+#ifdef __NR_getcpu
+	unsigned int cpu;
+	int err = syscall(__NR_getcpu, &cpu, NULL, NULL);
+
+	if (!err)
+		return cpu;
+#else
+	errno = ENOSYS;
+#endif
+	return -1;
+}
+#endif
+
+#ifndef HAVE_SCANDIRAT_SUPPORT
+int scandirat(int dirfd, const char *dirp,
+	      struct dirent ***namelist,
+	      int (*filter)(const struct dirent *),
+	      int (*compar)(const struct dirent **, const struct dirent **))
+{
+	char path[PATH_MAX];
+	int err, fd = openat(dirfd, dirp, O_PATH);
+
+	if (fd < 0)
+		return fd;
+
+	snprintf(path, sizeof(path), "/proc/%d/fd/%d", getpid(), fd);
+	err = scandir(path, namelist, filter, compar);
+	close(fd);
+	return err;
+}
+#endif