1 files changed, 94 insertions, 0 deletions
diff --git a/src/plugins/perfmon/arm/bundle/stall.c b/src/plugins/perfmon/arm/bundle/stall.c
new file mode 100644
index 00000000000..deef9045516
--- /dev/null
+++ b/src/plugins/perfmon/arm/bundle/stall.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2022 Arm and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vnet/vnet.h>
+#include <vppinfra/linux/sysfs.h>
+#include <perfmon/perfmon.h>
+#include <perfmon/arm/events.h>
+
+/* as per .events[n] in PERFMON_REGISTER_BUNDLE */
+enum
+{
+  STALL_BACKEND,
+  STALL_FRONTEND
+};
+
+static u8 *
+format_arm_stall (u8 *s, va_list *args)
+{
+  perfmon_node_stats_t *ns = va_arg (*args, perfmon_node_stats_t *);
+  int row = va_arg (*args, int);
+
+  switch (row)
+    {
+    case 0:
+      s = format (s, "%llu", ns->value[STALL_BACKEND] / ns->n_packets);
+      break;
+
+    case 1:
+      s = format (s, "%llu", ns->value[STALL_FRONTEND] / ns->n_packets);
+      break;
+
+    case 2:
+      s = format (s, "%llu", ns->value[STALL_BACKEND] / ns->n_calls);
+      break;
+
+    case 3:
+      s = format (s, "%llu", ns->value[STALL_FRONTEND] / ns->n_calls);
+      break;
+
+    case 4:
+      s = format (s, "%llu", ns->n_packets);
+      break;
+
+    case 5:
+      s = format (s, "%llu", ns->n_calls);
+      break;
+    }
+  return s;
+}
+
+PERFMON_REGISTER_BUNDLE (arm_stall) = {
+  .name = "stall",
+  .description = "PE cycle stalls per pkt/call",
+  .source = "arm",
+  .type = PERFMON_BUNDLE_TYPE_NODE,
+  .events[0] = ARMV8_PMUV3_STALL_BACKEND,
+  .events[1] = ARMV8_PMUV3_STALL_FRONTEND,
+  .n_events = 2,
+  .n_columns = 6,
+  .format_fn = format_arm_stall,
+  .column_headers = PERFMON_STRINGS ("Backend/pkt", "Frontend/pkt",
+				     "Backend/call", "Frontend/call",
+				     "packets", "calls"),
+  /*
+   * set a bit for every event used in each column
+   * this allows us to disable columns at bundle registration if an
+   * event is not supported
+   */
+  .column_events = PERFMON_COLUMN_EVENTS (SET_BIT (STALL_BACKEND),
+					  SET_BIT (STALL_FRONTEND),
+					  SET_BIT (STALL_BACKEND),
+					  SET_BIT (STALL_FRONTEND), 0, 0),
+  .footer =
+    "The stall counter counts every Attributable cycle on which no\n"
+    "Attributable instruction or operation was sent for execution\n"
+    "on this PE.\n\n"
+    "     Stall backend: No operation issued due to the backend\n"
+    "     Stall frontend: No operation issued due to the frontend\n"
+    "The division between frontend and backend is IMPLEMENTATION DEFINED\n\n"
+    "- See Armv8-A Architecture Reference Manual, D7.10 PMU events and"
+    " event numbers for full description.\n"
+};