[PATCH 2/5] perf, tools: Support per pmu json aliases

[Andi Kleen]

From: Andi Kleen <ak@xxxxxxxxxxxxxxx>

Add support for registering json aliases per PMU. Any alias
with an unit matching the prefix is registered to the PMU.
Uncore has are multiple instances of most units, so all
these aliases get registered for each individual PMU
(this is important later to run the event on every instance
of the PMU).

To avoid printing the events multiple times in perf list
filter out duplicated events during printing.

Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
---
 tools/perf/util/pmu.c | 29 ++++++++++++++++++++++++-----
 1 file changed, 24 insertions(+), 5 deletions(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 5ecbd1e..dac87bc 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -474,7 +474,8 @@ char * __weak get_cpuid_str(void)
  * to the current running CPU. Then, add all PMU events from that table
  * as aliases.
  */
-static int pmu_add_cpu_aliases(struct list_head *head)
+static int pmu_add_cpu_aliases(struct list_head *head, const char *name,
+				const char *type)
 {
 	int i;
 	struct pmu_events_map *map;
@@ -497,6 +498,9 @@ static int pmu_add_cpu_aliases(struct list_head *head)
 		if (!map->table)
 			goto out;
 
+		if (strcmp(map->type, type))
+			continue;
+
 		if (!strcmp(map->cpuid, cpuid))
 			break;
 	}
@@ -510,6 +514,9 @@ static int pmu_add_cpu_aliases(struct list_head *head)
 		if (!pe->name)
 			break;
 
+		if (pe->unit && strncmp(pe->unit, name, strlen(pe->unit)))
+			continue;
+
 		/* need type casts to override 'const' */
 		__perf_pmu__new_alias(head, NULL, (char *)pe->name,
 				(char *)pe->desc, (char *)pe->event,
@@ -533,6 +540,8 @@ static struct perf_pmu *pmu_lookup(const char *name)
 	LIST_HEAD(format);
 	LIST_HEAD(aliases);
 	__u32 type;
+	const char *typename;
+	int noff = 0;
 
 	/* No support for intel_bts or intel_pt so disallow them */
 	if (!strcmp(name, "intel_bts") || !strcmp(name, "intel_pt"))
@@ -546,15 +555,22 @@ static struct perf_pmu *pmu_lookup(const char *name)
 	if (pmu_format(name, &format))
 		return NULL;
 
+	if (pmu_type(name, &type))
+		return NULL;
+
 	if (pmu_aliases(name, &aliases))
 		return NULL;
 
 	if (!strcmp(name, "cpu"))
-		(void)pmu_add_cpu_aliases(&aliases);
-
-	if (pmu_type(name, &type))
-		return NULL;
+		typename = "core";
+	else if (!strncmp(name, "uncore_", 7)) {
+		typename = "uncore";
+		noff = 7;
+	} else
+		typename = NULL;
 
+	if (typename)
+		pmu_add_cpu_aliases(&aliases, name + noff, typename);
 	pmu = zalloc(sizeof(*pmu));
 	if (!pmu)
 		return NULL;
@@ -1113,6 +1129,9 @@ void print_pmu_events(const char *event_glob, bool name_only, bool quiet_flag,
 	len = j;
 	qsort(aliases, len, sizeof(struct sevent), cmp_sevent);
 	for (j = 0; j < len; j++) {
+		/* Skip duplicates */
+		if (j > 0 && !strcmp(aliases[j].name, aliases[j - 1].name))
+			continue;
 		if (name_only) {
 			printf("%s ", aliases[j].name);
 			continue;
-- 
2.4.2

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