perf jevents: Provide better path information for broken JSON

If the JSON input to jevents.py is broken it can be problematic to
work out which particular JSON file is broken. When processing files
catch exceptions that occur that re-raise the exception with path
details added.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Benjamin Gray <bgray@linux.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Xu Yang <xu.yang_2@nxp.com>
Link: https://lore.kernel.org/r/20241114172309.840241-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/pmu-events/jevents.py b/tools/perf/pmu-events/jevents.py
index 139dae1f1f8326e1faa55af89aba354cb85120e8..3e204700b59afc1e93c1d0a5771260904b8c5a39 100755 (executable)
--- a/tools/perf/pmu-events/jevents.py
+++ b/tools/perf/pmu-events/jevents.py
@@ -464,12 +464,16 @@ def preprocess_arch_std_files(archpath: str) -> None:
   """Read in all architecture standard events."""
   global _arch_std_events
   for item in os.scandir(archpath):
-    if item.is_file() and item.name.endswith('.json'):
+    if not item.is_file() or not item.name.endswith('.json'):
+      continue
+    try:
       for event in read_json_events(item.path, topic=''):
         if event.name:
           _arch_std_events[event.name.lower()] = event
         if event.metric_name:
           _arch_std_events[event.metric_name.lower()] = event
+    except Exception as e:
+        raise RuntimeError(f'Failure processing \'{item.name}\' in \'{archpath}\'') from e
 
 
 def add_events_table_entries(item: os.DirEntry, topic: str) -> None:
@@ -1255,7 +1259,10 @@ def main() -> None:
           item_path = '/'.join(parents) + ('/' if len(parents) > 0 else '') + item.name
           if 'test' not in item_path and 'common' not in item_path and item_path not in _args.model.split(','):
             continue
-      action(parents, item)
+      try:
+        action(parents, item)
+      except Exception as e:
+        raise RuntimeError(f'Action failure for \'{item.name}\' in {parents}') from e
       if item.is_dir():
         ftw(item.path, parents + [item.name], action)