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/*
* 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"
};
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