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/*
* Copyright (C) 2021 The Android Open Source Project
*
* 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 "DevfreqStateResidencyDataProvider.h"
#include <android-base/logging.h>
static const std::string nameSuffix = "-DVFS";
static const std::string pathSuffix = "/time_in_state";
namespace aidl {
namespace android {
namespace hardware {
namespace power {
namespace stats {
DevfreqStateResidencyDataProvider::DevfreqStateResidencyDataProvider(const std::string& name,
const std::string& path) : mName(name + nameSuffix), mPath(path + pathSuffix) {}
bool DevfreqStateResidencyDataProvider::extractNum(const char *str, char **str_end, int base,
int64_t* num) {
// errno can be set to any non-zero value by a library function call
// regardless of whether there was an error, so it needs to be cleared
// in order to check the error set by strtoll
errno = 0;
*num = std::strtoll(str, str_end, base);
return (errno != ERANGE);
}
std::vector<std::pair<int64_t, int64_t>> DevfreqStateResidencyDataProvider::parseTimeInState() {
// Using FILE* instead of std::ifstream for performance reasons
std::unique_ptr<FILE, decltype(&fclose)> fp(fopen(mPath.c_str(), "r"), fclose);
if (!fp) {
PLOG(ERROR) << "Failed to open file " << mPath;
return {};
}
std::vector<std::pair<int64_t, int64_t>> timeInState;
char *line = nullptr;
size_t len = 0;
while (getline(&line, &len, fp.get()) != -1) {
char* pEnd;
int64_t frequencyHz, totalTimeMs;
if (!extractNum(line, &pEnd, 10, &frequencyHz) ||
!extractNum(pEnd, &pEnd, 10, &totalTimeMs)) {
PLOG(ERROR) << "Failed to parse " << mPath;
free(line);
return {};
}
timeInState.push_back({frequencyHz, totalTimeMs});
}
free(line);
return timeInState;
}
bool DevfreqStateResidencyDataProvider::getStateResidencies(
std::unordered_map<std::string, std::vector<StateResidency>> *residencies) {
std::vector<std::pair<int64_t, int64_t>> timeInState = parseTimeInState();
if (timeInState.empty()) {
return false;
}
int32_t id = 0;
std::vector<StateResidency> stateResidencies;
for (const auto[frequencyHz, totalTimeMs] : timeInState) {
StateResidency s = {.id = id++, .totalTimeInStateMs = totalTimeMs};
stateResidencies.push_back(s);
}
residencies->emplace(mName, stateResidencies);
return true;
}
std::unordered_map<std::string, std::vector<State>> DevfreqStateResidencyDataProvider::getInfo() {
std::vector<std::pair<int64_t, int64_t>> timeInState = parseTimeInState();
if (timeInState.empty()) {
return {};
}
int32_t id = 0;
std::vector<State> states;
for (const auto[frequencyHz, totalTimeMs] : timeInState) {
State s = {.id = id++, .name = std::to_string(frequencyHz / 1000) + "KHz"};
states.push_back(s);
}
return {{mName, states}};
}
} // namespace stats
} // namespace power
} // namespace hardware
} // namespace android
} // namespace aidl
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