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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
{
BR_RETIRED,
BR_MIS_PRED_RETIRED,
BR_PRED,
BR_MIS_PRED
};
static u8 *
format_arm_branch_pred (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, "%.2f", (f64) ns->value[BR_RETIRED] / ns->n_calls);
break;
case 1:
s = format (s, "%.2f", (f64) ns->value[BR_RETIRED] / ns->n_packets);
break;
case 2:
s =
format (s, "%.2f", (f64) ns->value[BR_MIS_PRED_RETIRED] / ns->n_calls);
break;
case 3:
s = format (s, "%.2f",
(f64) ns->value[BR_MIS_PRED_RETIRED] / ns->n_packets);
break;
case 4:
s =
format (s, "%.2f%%",
(ns->value[BR_RETIRED] ? (f64) ns->value[BR_MIS_PRED_RETIRED] /
ns->value[BR_RETIRED] * 100 :
0));
break;
case 5:
s = format (s, "%.2f", (f64) ns->value[BR_PRED] / ns->n_calls);
break;
case 6:
s = format (s, "%.2f", (f64) ns->value[BR_PRED] / ns->n_packets);
break;
case 7:
s = format (s, "%.2f", (f64) ns->value[BR_MIS_PRED] / ns->n_calls);
break;
case 8:
s = format (s, "%.2f", (f64) ns->value[BR_MIS_PRED] / ns->n_packets);
break;
case 9:
s = format (s, "%.2f%%",
(ns->value[BR_PRED] ?
(f64) ns->value[BR_MIS_PRED] / ns->value[BR_PRED] * 100 :
0));
break;
case 10:
s = format (s, "%llu", ns->n_packets);
break;
}
return s;
}
PERFMON_REGISTER_BUNDLE (arm_branch_pred) = {
.name = "branch-pred",
.description = "Branch (mis)predictions per call/packet",
.source = "arm",
.type = PERFMON_BUNDLE_TYPE_NODE,
.events[0] = ARMV8_PMUV3_BR_RETIRED,
.events[1] = ARMV8_PMUV3_BR_MIS_PRED_RETIRED,
.events[2] = ARMV8_PMUV3_BR_PRED,
.events[3] = ARMV8_PMUV3_BR_MIS_PRED,
.n_events = 4,
.n_columns = 11,
.format_fn = format_arm_branch_pred,
.column_headers = PERFMON_STRINGS ("[1.1]", "[1.2]", "[1.3]", "[1.4]", "\%",
"[2.1]", "[2.2]", "[2.3]", "[2.4]", "\%",
"pkts"),
/*
* 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 (BR_RETIRED), SET_BIT (BR_RETIRED), SET_BIT (BR_MIS_PRED_RETIRED),
SET_BIT (BR_MIS_PRED_RETIRED),
SET_BIT (BR_RETIRED) | SET_BIT (BR_MIS_PRED_RETIRED), SET_BIT (BR_PRED),
SET_BIT (BR_PRED), SET_BIT (BR_MIS_PRED), SET_BIT (BR_MIS_PRED),
SET_BIT (BR_PRED) | SET_BIT (BR_MIS_PRED), 0),
.footer =
"An instruction that has been executed and retired is defined to\n"
"be architecturally executed. When a PE can perform speculative\n"
"execution, an instruction is not architecturally executed if the\n"
"PE discards the results of the speculative execution.\n\n"
"Per node statistics:\n"
"[1] Branch instruction architecturally executed\n"
" [1.1] Branches/call\n"
" [1.2] Branches/pkt\n"
" [1.3] Mispredicted/call \n"
" [1.4] Mispredicted/pkt\n"
" [\%] Percentage of branches mispredicted\n"
"[2] Predictable branch speculatively executed\n"
" [2.1] Branches/call\n"
" [2.2] Branches/pkt\n"
" [2.3] Mispredicted/call \n"
" [2.4] Mispredicted/pkt\n"
" [\%] Percentage of branches mispredicted\n\n"
"- See Armv8-A Architecture Reference Manual, D7.10 PMU events and"
" event numbers for full description.\n"
};
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