v4.19.13 snapshot.
diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
new file mode 100644
index 0000000..514f70f
--- /dev/null
+++ b/tools/perf/builtin-config.c
@@ -0,0 +1,260 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * builtin-config.c
+ *
+ * Copyright (C) 2015, Taeung Song <treeze.taeung@gmail.com>
+ *
+ */
+#include "builtin.h"
+
+#include "perf.h"
+
+#include "util/cache.h"
+#include <subcmd/parse-options.h>
+#include "util/util.h"
+#include "util/debug.h"
+#include "util/config.h"
+#include <linux/string.h>
+
+static bool use_system_config, use_user_config;
+
+static const char * const config_usage[] = {
+ "perf config [<file-option>] [options] [section.name[=value] ...]",
+ NULL
+};
+
+enum actions {
+ ACTION_LIST = 1
+} actions;
+
+static struct option config_options[] = {
+ OPT_SET_UINT('l', "list", &actions,
+ "show current config variables", ACTION_LIST),
+ OPT_BOOLEAN(0, "system", &use_system_config, "use system config file"),
+ OPT_BOOLEAN(0, "user", &use_user_config, "use user config file"),
+ OPT_END()
+};
+
+static int set_config(struct perf_config_set *set, const char *file_name)
+{
+ struct perf_config_section *section = NULL;
+ struct perf_config_item *item = NULL;
+ const char *first_line = "# this file is auto-generated.";
+ FILE *fp;
+
+ if (set == NULL)
+ return -1;
+
+ fp = fopen(file_name, "w");
+ if (!fp)
+ return -1;
+
+ fprintf(fp, "%s\n", first_line);
+
+ /* overwrite configvariables */
+ perf_config_items__for_each_entry(&set->sections, section) {
+ if (!use_system_config && section->from_system_config)
+ continue;
+ fprintf(fp, "[%s]\n", section->name);
+
+ perf_config_items__for_each_entry(§ion->items, item) {
+ if (!use_system_config && item->from_system_config)
+ continue;
+ if (item->value)
+ fprintf(fp, "\t%s = %s\n",
+ item->name, item->value);
+ }
+ }
+ fclose(fp);
+
+ return 0;
+}
+
+static int show_spec_config(struct perf_config_set *set, const char *var)
+{
+ struct perf_config_section *section;
+ struct perf_config_item *item;
+
+ if (set == NULL)
+ return -1;
+
+ perf_config_items__for_each_entry(&set->sections, section) {
+ if (!strstarts(var, section->name))
+ continue;
+
+ perf_config_items__for_each_entry(§ion->items, item) {
+ const char *name = var + strlen(section->name) + 1;
+
+ if (strcmp(name, item->name) == 0) {
+ char *value = item->value;
+
+ if (value) {
+ printf("%s=%s\n", var, value);
+ return 0;
+ }
+ }
+
+ }
+ }
+
+ return 0;
+}
+
+static int show_config(struct perf_config_set *set)
+{
+ struct perf_config_section *section;
+ struct perf_config_item *item;
+
+ if (set == NULL)
+ return -1;
+
+ perf_config_set__for_each_entry(set, section, item) {
+ char *value = item->value;
+
+ if (value)
+ printf("%s.%s=%s\n", section->name,
+ item->name, value);
+ }
+
+ return 0;
+}
+
+static int parse_config_arg(char *arg, char **var, char **value)
+{
+ const char *last_dot = strchr(arg, '.');
+
+ /*
+ * Since "var" actually contains the section name and the real
+ * config variable name separated by a dot, we have to know where the dot is.
+ */
+ if (last_dot == NULL || last_dot == arg) {
+ pr_err("The config variable does not contain a section name: %s\n", arg);
+ return -1;
+ }
+ if (!last_dot[1]) {
+ pr_err("The config variable does not contain a variable name: %s\n", arg);
+ return -1;
+ }
+
+ *value = strchr(arg, '=');
+ if (*value == NULL)
+ *var = arg;
+ else if (!strcmp(*value, "=")) {
+ pr_err("The config variable does not contain a value: %s\n", arg);
+ return -1;
+ } else {
+ *value = *value + 1; /* excluding a first character '=' */
+ *var = strsep(&arg, "=");
+ if (*var[0] == '\0') {
+ pr_err("invalid config variable: %s\n", arg);
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+int cmd_config(int argc, const char **argv)
+{
+ int i, ret = -1;
+ struct perf_config_set *set;
+ char *user_config = mkpath("%s/.perfconfig", getenv("HOME"));
+ const char *config_filename;
+ bool changed = false;
+
+ argc = parse_options(argc, argv, config_options, config_usage,
+ PARSE_OPT_STOP_AT_NON_OPTION);
+
+ if (use_system_config && use_user_config) {
+ pr_err("Error: only one config file at a time\n");
+ parse_options_usage(config_usage, config_options, "user", 0);
+ parse_options_usage(NULL, config_options, "system", 0);
+ return -1;
+ }
+
+ if (use_system_config)
+ config_exclusive_filename = perf_etc_perfconfig();
+ else if (use_user_config)
+ config_exclusive_filename = user_config;
+
+ if (!config_exclusive_filename)
+ config_filename = user_config;
+ else
+ config_filename = config_exclusive_filename;
+
+ /*
+ * At only 'config' sub-command, individually use the config set
+ * because of reinitializing with options config file location.
+ */
+ set = perf_config_set__new();
+ if (!set)
+ goto out_err;
+
+ switch (actions) {
+ case ACTION_LIST:
+ if (argc) {
+ pr_err("Error: takes no arguments\n");
+ parse_options_usage(config_usage, config_options, "l", 1);
+ } else {
+ if (show_config(set) < 0) {
+ pr_err("Nothing configured, "
+ "please check your %s \n", config_filename);
+ goto out_err;
+ }
+ }
+ break;
+ default:
+ if (!argc) {
+ usage_with_options(config_usage, config_options);
+ break;
+ }
+
+ for (i = 0; argv[i]; i++) {
+ char *var, *value;
+ char *arg = strdup(argv[i]);
+
+ if (!arg) {
+ pr_err("%s: strdup failed\n", __func__);
+ goto out_err;
+ }
+
+ if (parse_config_arg(arg, &var, &value) < 0) {
+ free(arg);
+ goto out_err;
+ }
+
+ if (value == NULL) {
+ if (show_spec_config(set, var) < 0) {
+ pr_err("%s is not configured: %s\n",
+ var, config_filename);
+ free(arg);
+ goto out_err;
+ }
+ } else {
+ if (perf_config_set__collect(set, config_filename,
+ var, value) < 0) {
+ pr_err("Failed to add '%s=%s'\n",
+ var, value);
+ free(arg);
+ goto out_err;
+ }
+ changed = true;
+ }
+ free(arg);
+ }
+
+ if (!changed)
+ break;
+
+ if (set_config(set, config_filename) < 0) {
+ pr_err("Failed to set the configs on %s\n",
+ config_filename);
+ goto out_err;
+ }
+ }
+
+ ret = 0;
+out_err:
+ perf_config_set__delete(set);
+ return ret;
+}