perf jevent: Parse metric thresholds

Parse the metric threshold and add to the pmu-events.c file. The
metric isn't parsed as the parser uses python's parser and will break
the operator precedence.

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/20230219092848.639226-34-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/pmu-events/jevents.py

@@ -51,7 +51,7 @@
 
 # Attributes that are in pmu_metric rather than pmu_event.
 _json_metric_attributes = [
-    'metric_name', 'metric_group', 'metric_expr', 'desc',
+    'metric_name', 'metric_group', 'metric_expr', 'metric_threshold', 'desc',
     'long_desc', 'unit', 'compat', 'aggr_mode', 'event_grouping'
 ]
 # Attributes that are bools or enum int values, encoded as '0', '1',...
@@ -306,6 +306,9 @@ def unit_to_pmu(unit: str) -> Optional[str]:
     self.metric_expr = None
     if 'MetricExpr' in jd:
       self.metric_expr = metric.ParsePerfJson(jd['MetricExpr']).Simplify()
+    # Note, the metric formula for the threshold isn't parsed as the &
+    # and > have incorrect precedence.
+    self.metric_threshold = jd.get('MetricThreshold')
 
     arch_std = jd.get('ArchStdEvent')
     if precise and self.desc and '(Precise Event)' not in self.desc:
@@ -362,6 +365,8 @@ def build_c_string(self, metric: bool) -> str:
         # Convert parsed metric expressions into a string. Slashes
         # must be doubled in the file.
         x = x.ToPerfJson().replace('\\', '\\\\')
+      if metric and x and attr == 'metric_threshold':
+        x = x.replace('\\', '\\\\')
       if attr in _json_enum_attributes:
         s += x if x else '0'
       else:

tools/perf/pmu-events/pmu-events.h

@@ -54,6 +54,7 @@ struct pmu_metric {
 	const char *metric_name;
 	const char *metric_group;
 	const char *metric_expr;
+	const char *metric_threshold;
 	const char *unit;
 	const char *compat;
 	const char *desc;