perf pmu-events: Make the metric_constraint an enum

Rename metric_constraint to event_grouping to better explain what the
variable is used for. Switch to use an enum for encoding instead of a
string. Rather than just no constraint/grouping information or
"NO_NMI_WATCHDOG", have 4 enum values. The values encode whether to
group or not, and two cases where the behavior is dependent on either
the NMI watchdog being enabled or SMT being enabled.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Caleb Biggers <caleb.biggers@intel.com>
Cc: Eduard Zingerman <eddyz87@gmail.com>
Cc: Florian Fischer <florian.fischer@muhq.space>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Perry Taylor <perry.taylor@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-stm32@st-md-mailman.stormreply.com
Link: https://lore.kernel.org/r/20230219092848.639226-9-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 16 insertions, 4 deletions

diff --git a/tools/perf/pmu-events/jevents.py b/tools/perf/pmu-events/jevents.py
index 2da55408398f..dc0c56dccb5e 100755
--- a/tools/perf/pmu-events/jevents.py
+++ b/tools/perf/pmu-events/jevents.py
@@ -51,8 +51,8 @@ _json_event_attributes = [
 
 # Attributes that are in pmu_metric rather than pmu_event.
 _json_metric_attributes = [
-    'metric_name', 'metric_group', 'metric_constraint', 'metric_expr', 'desc',
-    'long_desc', 'unit', 'compat', 'aggr_mode'
+    'metric_name', 'metric_group', 'metric_expr', 'desc',
+    'long_desc', 'unit', 'compat', 'aggr_mode', 'event_grouping'
 ]
 
 def removesuffix(s: str, suffix: str) -> str:
@@ -204,6 +204,18 @@ class JsonEvent:
       }
       return aggr_mode_to_enum[aggr_mode]
 
+    def convert_metric_constraint(metric_constraint: str) -> Optional[str]:
+      """Returns the metric_event_groups enum value associated with the JSON string."""
+      if not metric_constraint:
+        return None
+      metric_constraint_to_enum = {
+          'NO_GROUP_EVENTS': '1',
+          'NO_GROUP_EVENTS_NMI': '2',
+          'NO_NMI_WATCHDOG': '2',
+          'NO_GROUP_EVENTS_SMT': '3',
+      }
+      return metric_constraint_to_enum[metric_constraint]
+
     def lookup_msr(num: str) -> Optional[str]:
       """Converts the msr number, or first in a list to the appropriate event field."""
       if not num:
@@ -288,7 +300,7 @@ class JsonEvent:
     self.deprecated = jd.get('Deprecated')
     self.metric_name = jd.get('MetricName')
     self.metric_group = jd.get('MetricGroup')
-    self.metric_constraint = jd.get('MetricConstraint')
+    self.event_grouping = convert_metric_constraint(jd.get('MetricConstraint'))
     self.metric_expr = None
     if 'MetricExpr' in jd:
       self.metric_expr = metric.ParsePerfJson(jd['MetricExpr']).Simplify()
@@ -678,7 +690,7 @@ static void decompress_event(int offset, struct pmu_event *pe)
 {
 \tconst char *p = &big_c_string[offset];
 """)
-  enum_attributes = ['aggr_mode', 'deprecated', 'perpkg']
+  enum_attributes = ['aggr_mode', 'deprecated', 'event_grouping', 'perpkg']
   for attr in _json_event_attributes:
     _args.output_file.write(f'\n\tpe->{attr} = ')
     if attr in enum_attributes: