[PATCH v9 02/11] perf, tools: Add support for text descriptions of events and alias add

[Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>]

From: Andi Kleen <ak@linux.intel.com>

Change pmu.c to allow descriptions of events and add interfaces
to add aliases at runtime from another file. To be used by jevents in
a followon patch

Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
---
Changelog[v9] by Sukadev Bhattiprolu
	Rebase to 4.0
	v2: Move perf list changes to other patch.
---
 tools/perf/util/json.c |    1 +
 tools/perf/util/pmu.c  |   48 +++++++++++++++++++++++++++++++++---------------
 tools/perf/util/pmu.h  |    1 +
 3 files changed, 35 insertions(+), 15 deletions(-)

diff --git a/tools/perf/util/json.c b/tools/perf/util/json.c
index e20001f..2219844 100644
--- a/tools/perf/util/json.c
+++ b/tools/perf/util/json.c
@@ -38,6 +38,7 @@
 #include "jsmn.h"
 #include "json.h"
 #include <linux/kernel.h>
+#include "debug.h"
 
 static char *mapfile(const char *fn, size_t *size)
 {
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 4841167..527da74 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -198,17 +198,12 @@ static int perf_pmu__parse_snapshot(struct perf_pmu_alias *alias,
 	return 0;
 }
 
-static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FILE *file)
+static int __perf_pmu__new_alias(struct list_head *list, char *name, char *dir,
+			char *desc, char *val)
 {
 	struct perf_pmu_alias *alias;
-	char buf[256];
 	int ret;
 
-	ret = fread(buf, 1, sizeof(buf), file);
-	if (ret == 0)
-		return -EINVAL;
-	buf[ret] = 0;
-
 	alias = malloc(sizeof(*alias));
 	if (!alias)
 		return -ENOMEM;
@@ -218,26 +213,49 @@ static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FI
 	alias->unit[0] = '\0';
 	alias->per_pkg = false;
 
-	ret = parse_events_terms(&alias->terms, buf);
+	ret = parse_events_terms(&alias->terms, val);
 	if (ret) {
+		pr_err("Cannot parse alias %s: %d\n", val, ret);
 		free(alias);
 		return ret;
 	}
 
 	alias->name = strdup(name);
-	/*
-	 * load unit name and scale if available
-	 */
-	perf_pmu__parse_unit(alias, dir, name);
-	perf_pmu__parse_scale(alias, dir, name);
-	perf_pmu__parse_per_pkg(alias, dir, name);
-	perf_pmu__parse_snapshot(alias, dir, name);
+
+	if (dir) {
+		/*
+		 * load unit name and scale if available
+		 */
+		perf_pmu__parse_unit(alias, dir, name);
+		perf_pmu__parse_scale(alias, dir, name);
+		perf_pmu__parse_per_pkg(alias, dir, name);
+		perf_pmu__parse_snapshot(alias, dir, name);
+	}
+
+	alias->desc = desc ? strdup(desc) : NULL;
 
 	list_add_tail(&alias->list, list);
 
 	return 0;
 }
 
+static int perf_pmu__new_alias(struct list_head *list,
+		char *dir,
+		char *name,
+		FILE *file)
+{
+	char buf[256];
+	int ret;
+
+	ret = fread(buf, 1, sizeof(buf), file);
+	if (ret == 0)
+		return -EINVAL;
+	buf[ret] = 0;
+
+	return __perf_pmu__new_alias(list, name, dir, NULL, buf);
+}
+
+
 static inline bool pmu_alias_info_file(char *name)
 {
 	size_t len;
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 6b1249f..d06496d 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -37,6 +37,7 @@ struct perf_pmu_info {
 
 struct perf_pmu_alias {
 	char *name;
+	char *desc;
 	struct list_head terms; /* HEAD struct parse_events_term -> list */
 	struct list_head list;  /* ELEM */
 	char unit[UNIT_MAX_LEN+1];
-- 
1.7.9.5