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-rw-r--r--src/plugins/perfmon/arm/bundle/stall.c94
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"
+};