[PATCH RFC 4/9] perf jevents: Add sys_events_find_events_table()

[John Garry <john.g.garry@oracle.com>]

Add a function to get the events table associated with a metric table for
struct pmu_sys_events.

We could also use something like:
struct pmu_sys_events *sys = container_of(metrics, struct pmu_sys_events,
						metric_table);

to lookup struct pmu_sys_events, but that relies on the user always passing
a sys events metric struct pointer, so this way is safer, but slower.

Signed-off-by: John Garry <john.g.garry@oracle.com>
---
 tools/perf/pmu-events/empty-pmu-events.c |  6 ++++++
 tools/perf/pmu-events/jevents.py         | 11 +++++++++++
 tools/perf/pmu-events/pmu-events.h       |  3 +++
 3 files changed, 20 insertions(+)

diff --git a/tools/perf/pmu-events/empty-pmu-events.c b/tools/perf/pmu-events/empty-pmu-events.c
index a630c617e879..ae431b6bdf91 100644
--- a/tools/perf/pmu-events/empty-pmu-events.c
+++ b/tools/perf/pmu-events/empty-pmu-events.c
@@ -290,6 +290,12 @@ int pmu_metrics_table_for_each_metric(const struct pmu_metrics_table *table, pmu
 	return 0;
 }
 
+const struct pmu_events_table *
+sys_events_find_events_table(__maybe_unused const struct pmu_metrics_table *metrics)
+{
+	return NULL;
+}
+
 const struct pmu_events_table *perf_pmu__find_events_table(struct perf_pmu *pmu)
 {
 	const struct pmu_events_table *table = NULL;
diff --git a/tools/perf/pmu-events/jevents.py b/tools/perf/pmu-events/jevents.py
index 80b569b8634b..947e8b1efa26 100755
--- a/tools/perf/pmu-events/jevents.py
+++ b/tools/perf/pmu-events/jevents.py
@@ -786,6 +786,17 @@ int pmu_metrics_table_for_each_metric(const struct pmu_metrics_table *table,
         return 0;
 }
 
+const struct pmu_events_table *
+sys_events_find_events_table(const struct pmu_metrics_table *metrics)
+{
+	for (const struct pmu_sys_events *tables = &pmu_sys_event_tables[0];
+             tables->name; tables++) {
+		if (&tables->metric_table == metrics)
+			return &tables->event_table;
+	}
+	return NULL;
+}
+
 const struct pmu_events_table *perf_pmu__find_events_table(struct perf_pmu *pmu)
 {
         const struct pmu_events_table *table = NULL;
diff --git a/tools/perf/pmu-events/pmu-events.h b/tools/perf/pmu-events/pmu-events.h
index caf59f23cd64..a3642c08e39d 100644
--- a/tools/perf/pmu-events/pmu-events.h
+++ b/tools/perf/pmu-events/pmu-events.h
@@ -77,6 +77,9 @@ typedef int (*pmu_metric_iter_fn)(const struct pmu_metric *pm,
 				  const struct pmu_metrics_table *table,
 				  void *data);
 
+const struct pmu_events_table *
+sys_events_find_events_table(const struct pmu_metrics_table *metrics);
+
 int pmu_events_table_for_each_event(const struct pmu_events_table *table, pmu_event_iter_fn fn,
 				    void *data);
 int pmu_metrics_table_for_each_metric(const struct pmu_metrics_table *table, pmu_metric_iter_fn fn,
-- 
2.35.3