[PATCH 3/3] perf, tools: List kernel supplied event aliases in perf list

[Andi Kleen]

From: Andi Kleen <ak@xxxxxxxxxxxxxxx>

List the kernel supplied pmu event aliases in perf list

It's better when the users can actually see them.

Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
---
 tools/perf/Documentation/perf-list.txt |    4 +-
 tools/perf/builtin-list.c              |    3 +
 tools/perf/util/parse-events.c         |    5 ++-
 tools/perf/util/pmu.c                  |   71 ++++++++++++++++++++++++++++++++
 tools/perf/util/pmu.h                  |    3 +
 5 files changed, 84 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Documentation/perf-list.txt b/tools/perf/Documentation/perf-list.txt
index d1e39dc..826f3d6 100644
--- a/tools/perf/Documentation/perf-list.txt
+++ b/tools/perf/Documentation/perf-list.txt
@@ -8,7 +8,7 @@ perf-list - List all symbolic event types
 SYNOPSIS
 --------
 [verse]
-'perf list' [hw|sw|cache|tracepoint|event_glob]
+'perf list' [hw|sw|cache|tracepoint|pmu|event_glob]
 
 DESCRIPTION
 -----------
@@ -104,6 +104,8 @@ To limit the list use:
   'subsys_glob:event_glob' to filter by tracepoint subsystems such as sched,
   block, etc.
 
+. 'pmu' to print the kernel supplied PMU events.
+
 . If none of the above is matched, it will apply the supplied glob to all
   events, printing the ones that match.
 
diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
index 1948ece..e79f423 100644
--- a/tools/perf/builtin-list.c
+++ b/tools/perf/builtin-list.c
@@ -13,6 +13,7 @@
 
 #include "util/parse-events.h"
 #include "util/cache.h"
+#include "util/pmu.h"
 
 int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
 {
@@ -37,6 +38,8 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
 			else if (strcmp(argv[i], "cache") == 0 ||
 				 strcmp(argv[i], "hwcache") == 0)
 				print_hwcache_events(NULL, false);
+			else if (strcmp(argv[i], "pmu") == 0)
+				print_pmu_events(NULL, false);
 			else if (strcmp(argv[i], "--raw-dump") == 0)
 				print_events(NULL, true);
 			else {
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 4e7117f..0b1a4b1 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1033,6 +1033,8 @@ int print_hwcache_events(const char *event_glob, bool name_only)
 		}
 	}
 
+	if (printed)
+		printf("\n");
 	return printed;
 }
 
@@ -1087,11 +1089,12 @@ void print_events(const char *event_glob, bool name_only)
 
 	print_hwcache_events(event_glob, name_only);
 
+	print_pmu_events(event_glob, name_only);
+
 	if (event_glob != NULL)
 		return;
 
 	if (!name_only) {
-		printf("\n");
 		printf("  %-50s [%s]\n",
 		       "rNNN",
 		       event_type_descriptors[PERF_TYPE_RAW]);
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 8a2229d..c0d2fc9 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -551,6 +551,77 @@ void perf_pmu__set_format(unsigned long *bits, long from, long to)
 		set_bit(b, bits);
 }
 
+static char *format_alias(char *buf, int len, struct perf_pmu *pmu,
+			  struct perf_pmu__alias *alias)
+{
+	snprintf(buf, len, "%s/%s/", pmu->name, alias->name);
+	return buf;		
+}
+
+static char *format_alias_or(char *buf, int len, struct perf_pmu *pmu,
+			     struct perf_pmu__alias *alias)
+{
+	snprintf(buf, len, "%s OR %s/%s/", alias->name, pmu->name, alias->name);
+	return buf;		
+}
+
+static int cmp_string(const void *a, const void *b)
+{
+	const char * const *as = a;
+	const char * const *bs = b;
+	return strcmp(*as, *bs);
+}
+
+void print_pmu_events(const char *event_glob, bool name_only)
+{
+	struct perf_pmu *pmu;
+	struct perf_pmu__alias *alias;
+	char buf[1024];
+	int printed = 0;
+	int len, j;
+	char **aliases;
+
+	pmu = NULL;
+	len = 0;
+	while ((pmu = perf_pmu__scan(pmu)) != NULL)
+		list_for_each_entry (alias, &pmu->aliases, list)
+			len++;
+	aliases = malloc(sizeof(char *) * len);
+	if (!aliases)
+		return;
+	pmu = NULL;
+	j = 0;
+	while ((pmu = perf_pmu__scan(pmu)) != NULL)
+		list_for_each_entry (alias, &pmu->aliases, list) {
+			char *name = format_alias(buf, sizeof buf, pmu, alias);
+			bool is_cpu = !strcmp(pmu->name, "cpu");
+
+			if (event_glob != NULL && 
+			    !(strglobmatch(name, event_glob) ||
+			      (!is_cpu && strglobmatch(alias->name, event_glob))))
+				continue;
+			aliases[j] = name;
+			if (is_cpu && !name_only)
+				aliases[j] = format_alias_or(buf, sizeof buf,
+							      pmu, alias);
+			aliases[j] = strdup(aliases[j]);
+			j++;
+		}
+	qsort(aliases, len, sizeof(char *), cmp_string);
+	for (j = 0; j < len; j++) {
+		if (name_only) {
+			printf("%s ", aliases[j]);
+			continue;
+		}
+		printf("  %-50s [Kernel PMU event]\n", aliases[j]);
+		free(aliases[j]);
+		printed++;
+	}
+	if (printed)
+		printf("\n");
+	free(aliases);
+}
+
 /* Simulated format definitions. */
 static struct test_format {
 	const char *name;
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 53c7794..b4e0203 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -3,6 +3,7 @@
 
 #include <linux/bitops.h>
 #include "../../../include/linux/perf_event.h"
+#include <stdbool.h>
 
 enum {
 	PERF_PMU_FORMAT_VALUE_CONFIG,
@@ -49,5 +50,7 @@ void perf_pmu__set_format(unsigned long *bits, long from, long to);
 
 struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu);
 
+void print_pmu_events(const char *event_glob, bool name_only);
+
 int perf_pmu__test(void);
 #endif /* __PMU_H */
-- 
1.7.7.6

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