[PATCH v5 3/6] perf config: Add a option 'list-all' to perf-config

[Taeung Song]

A option 'list-all' is to display both current config variables and
all possible config variables with default values.
The syntax examples are like below

    perf config [options]

    display all perf config with default values.
    # perf config -a | --list-all

Signed-off-by: Taeung Song <treeze.taeung@xxxxxxxxx>
---
 tools/perf/Documentation/perf-config.txt |   6 +
 tools/perf/builtin-config.c              | 490 ++++++++++++++++++++++++++++++-
 tools/perf/util/cache.h                  |  15 +
 3 files changed, 510 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt
index b2abb16..d95baad 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -9,6 +9,8 @@ SYNOPSIS
 --------
 [verse]
 'perf config' [<file-option>] -l | --list
+or
+'perf config' [<file-option>] -a | --list-all
 
 DESCRIPTION
 -----------
@@ -29,6 +31,10 @@ OPTIONS
 	For writing and reading options: write to system-wide
 	'$(sysconfdir)/perfconfig' or read it.
 
+-a::
+--list-all::
+	Show current and all possible config variables with default values.
+
 CONFIGURATION FILE
 ------------------
 
diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index df70b90..ac13aaf 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -22,7 +22,8 @@ static const char * const config_usage[] = {
 };
 
 enum actions {
-	ACTION_LIST = 1
+	ACTION_LIST = 1,
+	ACTION_LIST_ALL
 } actions;
 
 static const struct option config_options[] = {
@@ -32,9 +33,362 @@ static const struct option config_options[] = {
 	OPT_GROUP("Action"),
 	OPT_SET_UINT('l', "list", &actions,
 		     "show current config variables", ACTION_LIST),
+	OPT_SET_UINT('a', "list-all", &actions,
+		     "show current and all possible config variables with default values",
+		     ACTION_LIST_ALL),
 	OPT_END()
 };
 
+/* section names */
+#define COLORS "colors"
+#define TUI "tui"
+#define BUILDID "buildid"
+#define ANNOTATE "annotate"
+#define GTK "gtk"
+#define PAGER "pager"
+#define HELP "help"
+#define HIST "hist"
+#define UI "ui"
+#define CALL_GRAPH "call-graph"
+#define REPORT "report"
+#define TOP "top"
+#define MAN "man"
+#define KMEM "kmem"
+
+/* config variable types */
+#define TYPE_INT "int"
+#define TYPE_LONG "long"
+#define TYPE_DIRNAME "dirname"
+#define TYPE_BOOL "bool"
+#define TYPE_ON_OFF "on_off"
+
+static struct default_configset {
+	const char *section_name;
+	const char *name, *value, *type;
+
+} default_configsets[] = {
+	{
+		.section_name = COLORS,
+		.name = "top",
+		.value = "red, default",
+		.type = NULL,
+	},
+	{
+		.section_name = COLORS,
+		.name = "medium",
+		.value = "green, default",
+		.type = NULL,
+	},
+	{
+		.section_name = COLORS,
+		.name = "normal",
+		.value = "lightgray, default",
+		.type = NULL,
+	},
+	{
+		.section_name = COLORS,
+		.name = "selected",
+		.value = "white, lightgray",
+		.type = NULL,
+	},
+	{
+		.section_name = COLORS,
+		.name = "code",
+		.value = "blue, default",
+		.type = NULL,
+	},
+	{
+		.section_name = COLORS,
+		.name = "addr",
+		.value = "magenta, default",
+		.type = NULL,
+	},
+	{
+		.section_name = COLORS,
+		.name = "root",
+		.value = "white, blue",
+		.type = NULL,
+	},
+	{
+		.section_name = TUI,
+		.name = "report",
+		.value = "on",
+		.type = TYPE_ON_OFF,
+	},
+	{
+		.section_name = TUI,
+		.name = "annotate",
+		.value = "on",
+		.type = TYPE_ON_OFF,
+	},
+	{
+		.section_name = TUI,
+		.name = "top",
+		.value = "on",
+		.type = TYPE_ON_OFF,
+	},
+	{
+		.section_name = BUILDID,
+		.name = "dir",
+		.value = "~/.debug",
+		.type = TYPE_DIRNAME,
+	},
+	{
+		.section_name = ANNOTATE,
+		.name = "hide_src_code",
+		.value = "false",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = ANNOTATE,
+		.name = "use_offset",
+		.value = "true",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = ANNOTATE,
+		.name = "jump_arrows",
+		.value = "true",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = ANNOTATE,
+		.name = "show_nr_jumps",
+		.value = "false",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = GTK,
+		.name = "annotate",
+		.value = "off",
+		.type = TYPE_ON_OFF,
+	},
+	{
+		.section_name = GTK,
+		.name = "report",
+		.value = "off",
+		.type = TYPE_ON_OFF,
+	},
+	{
+		.section_name = GTK,
+		.name = "top",
+		.value = "off",
+		.type = TYPE_ON_OFF,
+	},
+	{
+		.section_name = PAGER,
+		.name = "cmd",
+		.value = "true",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = PAGER,
+		.name = "report",
+		.value = "true",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = PAGER,
+		.name = "annotate",
+		.value = "true",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = PAGER,
+		.name = "record",
+		.value = "true",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = PAGER,
+		.name = "top",
+		.value = "true",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = PAGER,
+		.name = "diff",
+		.value = "true",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = HELP,
+		.name = "format",
+		.value = "man",
+		.type = NULL,
+	},
+	{
+		.section_name = HELP,
+		.name = "autocorrect",
+		.value = "0",
+		.type = NULL,
+	},
+	{
+		.section_name = HIST,
+		.name = "percentage",
+		.value = "absolute",
+		.type = NULL,
+	},
+	{
+		.section_name = UI,
+		.name = "show-headers",
+		.value = "true",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = CALL_GRAPH,
+		.name = "record-mode",
+		.value = "fp",
+	},
+	{
+		.section_name = CALL_GRAPH,
+		.name = "dump-size",
+		.value = "8192",
+		.type = TYPE_INT,
+	},
+	{
+		.section_name = CALL_GRAPH,
+		.name = "print-type",
+		.value = "fractal",
+		.type = NULL,
+	},
+	{
+		.section_name = CALL_GRAPH,
+		.name = "order",
+		.value = "caller",
+		.type = NULL,
+	},
+	{
+		.section_name = CALL_GRAPH,
+		.name = "sort-key",
+		.value = "function",
+		.type = NULL,
+	},
+	{
+		.section_name = CALL_GRAPH,
+		.name = "threshold",
+		.value = "0.5",
+		.type = TYPE_LONG,
+	},
+	{
+		.section_name = CALL_GRAPH,
+		.name = "print-limit",
+		.value = "0",
+		.type = TYPE_INT,
+	},
+	{
+		.section_name = REPORT,
+		.name = "children",
+		.value = "false",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = REPORT,
+		.name = "percent-limit",
+		.value = "0",
+		.type = TYPE_INT,
+	},
+	{
+		.section_name = REPORT,
+		.name = "queue-size",
+		.value = "0",
+		.type = TYPE_INT,
+	},
+	{
+		.section_name = TOP,
+		.name = "children",
+		.value = "false",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = MAN,
+		.name = "viewer",
+		.value = "man",
+		.type = NULL,
+	},
+	{
+		.section_name = KMEM,
+		.name = "default",
+		.value = "slab",
+		.type = NULL,
+	},
+	{
+		.section_name = NULL,
+		.name = NULL,
+		.value = NULL,
+		.type = NULL,
+	},
+};
+
+static struct config_section *find_section(const char *section_name)
+{
+	struct config_section *section_node;
+
+	list_for_each_entry(section_node, &sections, list)
+		if (!strcmp(section_node->name, section_name))
+			return section_node;
+
+	return NULL;
+}
+
+static struct config_element *find_element(const char *name,
+					   struct config_section *section_node)
+{
+	struct config_element *element_node;
+
+	list_for_each_entry(element_node, &section_node->element_head, list)
+		if (!strcmp(element_node->name, name))
+			return element_node;
+
+	return NULL;
+}
+
+static struct config_section *init_section(const char *section_name)
+{
+	struct config_section *section_node;
+
+	section_node = zalloc(sizeof(*section_node));
+	if (!section_node)
+		return NULL;
+
+	INIT_LIST_HEAD(&section_node->element_head);
+	section_node->name = strdup(section_name);
+	if (!section_node->name) {
+		pr_err("%s: strdup failed\n", __func__);
+		free(section_node);
+		return NULL;
+	}
+
+	return section_node;
+}
+
+static int add_element(struct list_head *head,
+			      const char *name, const char *value)
+{
+	struct config_element *element_node;
+
+	element_node = zalloc(sizeof(*element_node));
+	if (!element_node)
+		return -1;
+
+	element_node->name = strdup(name);
+	if (!element_node->name) {
+		pr_err("%s: strdup failed\n", __func__);
+		goto out_free;
+	}
+	if (value)
+		element_node->value = (char *)value;
+	else
+		element_node->value = NULL;
+
+	list_add_tail(&element_node->list, head);
+	return 0;
+
+out_free:
+	free(element_node);
+	return -1;
+}
+
 static int show_config(const char *key, const char *value,
 		       void *cb __maybe_unused)
 {
@@ -46,6 +400,132 @@ static int show_config(const char *key, const char *value,
 	return 0;
 }
 
+static void find_config(struct config_section **section_node,
+			struct config_element **element_node,
+			const char *section_name, const char *name)
+{
+	*section_node = find_section(section_name);
+
+	if (*section_node != NULL)
+		*element_node = find_element(name, *section_node);
+	else
+		*element_node = NULL;
+}
+
+static char *normalize_value(const char *section_name, const char *name, const char *value)
+{
+	int i, ret = 0;
+	char key[BUFSIZ];
+	char *normalized;
+
+	scnprintf(key, sizeof(key), "%s.%s", section_name, name);
+	for (i = 0; default_configsets[i].section_name != NULL; i++) {
+		struct default_configset *config = &default_configsets[i];
+
+		if (!strcmp(config->section_name, section_name)
+		    && !strcmp(config->name, name)) {
+			if (!config->type)
+				ret = asprintf(&normalized, "%s", value);
+			else if (!strcmp(config->type, TYPE_BOOL))
+				ret = asprintf(&normalized, "%s",
+					       perf_config_bool(key, value) ? "true" : "false");
+			else if (!strcmp(config->type, TYPE_ON_OFF))
+				ret = asprintf(&normalized, "%s",
+					       perf_config_bool(key, value) ? "on" : "off");
+			else if (!strcmp(config->type, TYPE_INT))
+				ret = asprintf(&normalized, "%d",
+					       perf_config_int(key, value));
+			else if (!strcmp(config->type, TYPE_LONG))
+				ret = asprintf(&normalized, "%"PRId64,
+					       perf_config_u64(key, value));
+			else if (!strcmp(config->type, TYPE_DIRNAME))
+				ret = asprintf(&normalized, "%s",
+					       perf_config_dirname(key, value));
+			if (ret < 0)
+				return NULL;
+
+			return normalized;
+		}
+	}
+
+	normalized = strdup(value);
+	if (!normalized) {
+		pr_err("%s: strdup failed\n", __func__);
+		return NULL;
+	}
+
+	return normalized;
+}
+
+static int collect_current_config(const char *var, const char *value,
+			  void *cb __maybe_unused)
+{
+	struct config_section *section_node;
+	char *key = strdup(var);
+	char *section_name, *name;
+
+	if (!key) {
+		pr_err("%s: strdup failed\n", __func__);
+		return -1;
+	}
+
+	section_name = strsep(&key, ".");
+	name = strsep(&key, ".");
+	free(key);
+	if (name == NULL)
+		return -1;
+
+	section_node = find_section(section_name);
+	if (!section_node) {
+		section_node = init_section(section_name);
+		if (!section_node)
+			return -1;
+		list_add_tail(&section_node->list, &sections);
+	}
+
+	return add_element(&section_node->element_head, name,
+			   normalize_value(section_name, name, value));
+}
+
+static int show_all_config(void)
+{
+	int i;
+	bool has_config;
+	struct config_section *section_node;
+	struct config_element *element_node;
+
+	for (i = 0; default_configsets[i].section_name != NULL; i++) {
+		find_config(&section_node, &element_node,
+			    default_configsets[i].section_name, default_configsets[i].name);
+
+		if (!element_node)
+			printf("%s.%s=%s\n", default_configsets[i].section_name,
+			       default_configsets[i].name, default_configsets[i].value);
+		else
+			printf("%s.%s=%s\n", section_node->name,
+			       element_node->name, element_node->value);
+	}
+
+	/* Print config variables the default configsets haven't */
+	list_for_each_entry(section_node, &sections, list) {
+		list_for_each_entry(element_node, &section_node->element_head, list) {
+			has_config = false;
+			for (i = 0; default_configsets[i].section_name != NULL; i++) {
+				if (!strcmp(default_configsets[i].section_name, section_node->name)
+				    && !strcmp(default_configsets[i].name, element_node->name)) {
+					has_config = true;
+					break;
+				}
+			}
+			if (!has_config)
+				printf("%s.%s=%s\n", section_node->name,
+				       element_node->name, element_node->value);
+		}
+	}
+
+	return 0;
+}
+
 int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
 {
 	int ret = 0;
@@ -62,7 +542,15 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
 				  access(config_file_name, R_OK) == -1))
 		config_file_name = perf_etc_perfconfig();
 
+	INIT_LIST_HEAD(&sections);
+	perf_config_from_file(collect_current_config, config_file_name, NULL);
+
 	switch (actions) {
+	case ACTION_LIST_ALL:
+		if (argc == 0) {
+			ret = show_all_config();
+			break;
+		}
 	case ACTION_LIST:
 	default:
 		if (argc) {
diff --git a/tools/perf/util/cache.h b/tools/perf/util/cache.h
index bad3e4e..f49a5e2 100644
--- a/tools/perf/util/cache.h
+++ b/tools/perf/util/cache.h
@@ -1,6 +1,7 @@
 #ifndef __PERF_CACHE_H
 #define __PERF_CACHE_H
 
+#include <linux/list.h>
 #include <stdbool.h>
 #include "util.h"
 #include "strbuf.h"
@@ -19,6 +20,20 @@
 #define PERF_DEBUGFS_ENVIRONMENT "PERF_DEBUGFS_DIR"
 #define PERF_TRACEFS_ENVIRONMENT "PERF_TRACEFS_DIR"
 
+struct config_element {
+	char *name;
+	char *value;
+	struct list_head list;
+};
+
+struct config_section {
+	char *name;
+	struct list_head element_head;
+	struct list_head list;
+};
+
+struct list_head sections;
+
 typedef int (*config_fn_t)(const char *, const char *, void *);
 extern int perf_default_config(const char *, const char *, void *);
 extern int perf_config(config_fn_t fn, void *);
-- 
1.9.1

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