perf pmu: Support event aliases for non cpu// pmus

The code for handling pmu aliases without specifying the PMU hardcoded
only supported the cpu PMU.

This patch extends it to work for all PMUs. We always duplicate the
event for all PMUs that have an matching alias.  This allows to
automatically expand an alias for all instances of a PMU (so for example
you can monitor all cache boxes with a single event)

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20170128020345.19007-5-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/parse-events.c

@@ -1504,35 +1504,41 @@ static void perf_pmu__parse_init(void)
 	struct perf_pmu_alias *alias;
 	int len = 0;
 
-	pmu = perf_pmu__find("cpu");
-	if ((pmu == NULL) || list_empty(&pmu->aliases)) {
+	pmu = NULL;
+	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
+		list_for_each_entry(alias, &pmu->aliases, list) {
+			if (strchr(alias->name, '-'))
+				len++;
+			len++;
+		}
+	}
+
+	if (len == 0) {
 		perf_pmu_events_list_num = -1;
 		return;
 	}
-	list_for_each_entry(alias, &pmu->aliases, list) {
-		if (strchr(alias->name, '-'))
-			len++;
-		len++;
-	}
 	perf_pmu_events_list = malloc(sizeof(struct perf_pmu_event_symbol) * len);
 	if (!perf_pmu_events_list)
 		return;
 	perf_pmu_events_list_num = len;
 
 	len = 0;
-	list_for_each_entry(alias, &pmu->aliases, list) {
-		struct perf_pmu_event_symbol *p = perf_pmu_events_list + len;
-		char *tmp = strchr(alias->name, '-');
+	pmu = NULL;
+	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
+		list_for_each_entry(alias, &pmu->aliases, list) {
+			struct perf_pmu_event_symbol *p = perf_pmu_events_list + len;
+			char *tmp = strchr(alias->name, '-');
 
-		if (tmp != NULL) {
-			SET_SYMBOL(strndup(alias->name, tmp - alias->name),
-					PMU_EVENT_SYMBOL_PREFIX);
-			p++;
-			SET_SYMBOL(strdup(++tmp), PMU_EVENT_SYMBOL_SUFFIX);
-			len += 2;
-		} else {
-			SET_SYMBOL(strdup(alias->name), PMU_EVENT_SYMBOL);
-			len++;
+			if (tmp != NULL) {
+				SET_SYMBOL(strndup(alias->name, tmp - alias->name),
+						PMU_EVENT_SYMBOL_PREFIX);
+				p++;
+				SET_SYMBOL(strdup(++tmp), PMU_EVENT_SYMBOL_SUFFIX);
+				len += 2;
+			} else {
+				SET_SYMBOL(strdup(alias->name), PMU_EVENT_SYMBOL);
+				len++;
+			}
 		}
 	}
 	qsort(perf_pmu_events_list, len,

tools/perf/util/parse-events.y

@@ -12,6 +12,7 @@
 #include <linux/list.h>
 #include <linux/types.h>
 #include "util.h"
+#include "pmu.h"
 #include "parse-events.h"
 #include "parse-events-bison.h"
 
@@ -236,15 +237,32 @@ PE_KERNEL_PMU_EVENT sep_dc
 	struct list_head *head;
 	struct parse_events_term *term;
 	struct list_head *list;
+	struct perf_pmu *pmu = NULL;
+	int ok = 0;
 
-	ALLOC_LIST(head);
-	ABORT_ON(parse_events_term__num(&term, PARSE_EVENTS__TERM_TYPE_USER,
-					$1, 1, &@1, NULL));
-	list_add_tail(&term->list, head);
-
+	/* Add it for all PMUs that support the alias */
 	ALLOC_LIST(list);
-	ABORT_ON(parse_events_add_pmu(data, list, "cpu", head));
-	parse_events_terms__delete(head);
+	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
+		struct perf_pmu_alias *alias;
+
+		list_for_each_entry(alias, &pmu->aliases, list) {
+			if (!strcasecmp(alias->name, $1)) {
+				ALLOC_LIST(head);
+				ABORT_ON(parse_events_term__num(&term, PARSE_EVENTS__TERM_TYPE_USER,
+					$1, 1, &@1, NULL));
+				list_add_tail(&term->list, head);
+
+				if (!parse_events_add_pmu(data, list,
+						  pmu->name, head)) {
+					ok++;
+				}
+
+				parse_events_terms__delete(head);
+			}
+		}
+	}
+	if (!ok)
+		YYABORT;
 	$$ = list;
 }
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