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/*
* Copyright (c) 2021 Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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
*
* 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 "tensorflow/lite/kernels/internal/compatibility.h"
#include "tensorflow/lite/micro/micro_error_reporter.h"
#include "tensorflow/lite/micro/micro_profiler.h"
#include "tensorflow/lite/micro/micro_time.h"
#include <string.h>
#include "ethosu_profiler.hpp"
#include <ethosu_driver.h>
#include <inttypes.h>
#include <stdio.h>
namespace {
uint64_t GetCurrentEthosuTicks(struct ethosu_driver *drv) {
return ETHOSU_PMU_Get_CCNTR(drv);
}
} // namespace
namespace tflite {
EthosUProfiler::EthosUProfiler(size_t max_events) : max_events_(max_events), num_events_(0) {
tags_ = std::make_unique<const char *[]>(max_events_);
start_ticks_ = std::make_unique<uint64_t[]>(max_events_);
end_ticks_ = std::make_unique<uint64_t[]>(max_events_);
struct ethosu_driver *drv = ethosu_reserve_driver();
ETHOSU_PMU_CNTR_Enable(drv, ETHOSU_PMU_CCNT_Msk);
ETHOSU_PMU_CYCCNT_Reset(drv);
ethosu_release_driver(drv);
}
// NOTE: THIS PROFILER ONLY WORKS ON SYSTEMS WITH 1 NPU
uint32_t EthosUProfiler::BeginEvent(const char *tag) {
if (num_events_ == max_events_) {
tflite::GetMicroErrorReporter()->Report("Profiling event overflow, max: %u events", max_events_);
num_events_ = 0;
}
tags_[num_events_] = tag;
if (strcmp("ethos-u", tag) == 0) {
struct ethosu_driver *ethosu_drv = ethosu_reserve_driver();
ETHOSU_PMU_CYCCNT_Reset(ethosu_drv);
ETHOSU_PMU_PMCCNTR_CFG_Set_Start_Event(ethosu_drv, ETHOSU_PMU_NPU_ACTIVE);
ETHOSU_PMU_PMCCNTR_CFG_Set_Stop_Event(ethosu_drv, ETHOSU_PMU_NPU_IDLE);
start_ticks_[num_events_] = GetCurrentEthosuTicks(ethosu_drv);
ethosu_release_driver(ethosu_drv);
} else {
start_ticks_[num_events_] = GetCurrentTimeTicks();
}
end_ticks_[num_events_] = start_ticks_[num_events_] - 1;
return num_events_++;
}
// NOTE: THIS PROFILER ONLY WORKS ON SYSTEMS WITH 1 NPU
void EthosUProfiler::EndEvent(uint32_t event_handle) {
TFLITE_DCHECK(event_handle < max_events_);
if (strcmp("ethos-u", tags_[event_handle]) == 0) {
struct ethosu_driver *ethosu_drv = ethosu_reserve_driver();
end_ticks_[event_handle] = GetCurrentEthosuTicks(ethosu_drv);
ethosu_release_driver(ethosu_drv);
} else {
end_ticks_[event_handle] = GetCurrentTimeTicks();
}
printf("%s : cycle_cnt : %" PRIu64 " cycles\n",
tags_[event_handle],
end_ticks_[event_handle] - start_ticks_[event_handle]);
}
uint64_t EthosUProfiler::GetTotalTicks() const {
uint64_t ticks = 0;
for (size_t i = 0; i < num_events_; ++i) {
ticks += end_ticks_[i] - start_ticks_[i];
}
return ticks;
}
void EthosUProfiler::Log() const {
#if !defined(TF_LITE_STRIP_ERROR_STRINGS)
for (int i = 0; i < num_events_; ++i) {
uint64_t ticks = end_ticks_[i] - start_ticks_[i];
printf("%s took %" PRIu64 " cycles\n", tags_[i], ticks);
}
#endif
}
} // namespace tflite
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