[PATCH v3 04/20] perf jevents: Add CheckPmu to see if a PMU is in loaded json events

[Ian Rogers <irogers@google.com>]

CheckPmu can be used to determine if hybrid events are present,
allowing for hybrid conditional metrics/events/pmus to be premised on
the json files rather than hard coded tables.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/pmu-events/metric.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/perf/pmu-events/metric.py b/tools/perf/pmu-events/metric.py
index 03312cd6d491..e1847cccfdb0 100644
--- a/tools/perf/pmu-events/metric.py
+++ b/tools/perf/pmu-events/metric.py
@@ -8,10 +8,12 @@ import re
 from enum import Enum
 from typing import Dict, List, Optional, Set, Tuple, Union
 
+all_pmus = set()
 all_events = set()
 
 def LoadEvents(directory: str) -> None:
   """Populate a global set of all known events for the purpose of validating Event names"""
+  global all_pmus
   global all_events
   all_events = {
       "context\-switches",
@@ -24,12 +26,18 @@ def LoadEvents(directory: str) -> None:
     filename = os.fsdecode(file)
     if filename.endswith(".json"):
       for x in json.load(open(f"{directory}/{filename}")):
+        if "Unit" in x:
+          all_pmus.add(x["Unit"])
         if "EventName" in x:
           all_events.add(x["EventName"])
         elif "ArchStdEvent" in x:
           all_events.add(x["ArchStdEvent"])
 
 
+def CheckPmu(name: str) -> bool:
+  return name in all_pmus
+
+
 def CheckEvent(name: str) -> bool:
   """Check the event name exists in the set of all loaded events"""
   global all_events
-- 
2.44.0.278.ge034bb2e1d-goog