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/*
* Copyright (C) 2019 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.
*/
#define LOG_TAG "pwrstats_util"
#include "PowerStatsUtil.h"
#include <android-base/logging.h>
#include <android-base/parsedouble.h>
#include <android/hardware/power/stats/1.0/IPowerStats.h>
#include <fstream>
#include <iostream>
#include <memory>
#include <regex>
#include <string>
#include <unordered_map>
using android::sp;
using android::hardware::Return;
/**
* C-state residency data provider:
* Provides C-state residency information for each of the CPUs and L3 cache.
**/
class CstateDataProvider : public IPwrStatsUtilDataProvider {
public:
CstateDataProvider() = default;
int get(std::unordered_map<std::string, uint64_t>& data) override {
// example accessing a sysfs node
std::ifstream file("/sys/kernel/debug/lpm_stats/stats");
std::smatch matches;
const std::regex searchExpr("\\[(.*?)\\] (.*?):");
std::string line;
const std::string searchStr = "total success time:";
while (std::getline(file, line)) {
if (std::regex_search(line, matches, searchExpr)) {
std::ostringstream key;
key << matches[1] << "__" << matches[2];
while (std::getline(file, line)) {
size_t pos = line.find(searchStr);
if (pos != std::string::npos) {
float val;
if (android::base::ParseFloat(line.substr(pos + searchStr.size()), &val)) {
data.emplace(key.str(), static_cast<uint64_t>(val * 1000));
} else {
LOG(ERROR) << __func__ << ": failed to parse c-state data";
}
break;
}
}
}
}
return 0;
}
};
/**
* Power Stats HAL data provider:
* Provides data monitored by Power Stats HAL 1.0
**/
class PwrStatsHalDataProvider : public IPwrStatsUtilDataProvider {
public:
PwrStatsHalDataProvider() = default;
int get(std::unordered_map<std::string, uint64_t>& data) override {
// example using the power stats HAL
sp<android::hardware::power::stats::V1_0::IPowerStats> powerStatsService =
android::hardware::power::stats::V1_0::IPowerStats::getService();
if (powerStatsService == nullptr) {
LOG(ERROR) << "Unable to get power.stats HAL service.";
return 1;
}
std::unordered_map<uint32_t, std::string> entityNames;
std::unordered_map<uint32_t, std::unordered_map<uint32_t, std::string>> stateNames;
Return<void> ret;
ret = powerStatsService->getPowerEntityInfo([&entityNames](auto infos, auto /* status */) {
for (auto const& info : infos) {
entityNames.emplace(info.powerEntityId, info.powerEntityName);
}
});
if (!ret.isOk()) {
return 1;
}
ret = powerStatsService->getPowerEntityStateInfo({}, [&stateNames](auto stateSpaces,
auto /* status */) {
for (auto const& stateSpace : stateSpaces) {
stateNames.emplace(stateSpace.powerEntityId,
std::unordered_map<uint32_t, std::string>());
auto& entityStateNames = stateNames.at(stateSpace.powerEntityId);
for (auto const& state : stateSpace.states) {
entityStateNames.emplace(state.powerEntityStateId, state.powerEntityStateName);
}
}
});
if (!ret.isOk()) {
return 1;
}
ret = powerStatsService->getPowerEntityStateResidencyData(
{}, [&entityNames, &stateNames, &data](auto results, auto /* status */) {
for (auto const& result : results) {
for (auto stateResidency : result.stateResidencyData) {
std::ostringstream key;
key << entityNames.at(result.powerEntityId) << "__"
<< stateNames.at(result.powerEntityId)
.at(stateResidency.powerEntityStateId);
data.emplace(key.str(),
static_cast<uint64_t>(stateResidency.totalTimeInStateMs));
}
}
});
if (!ret.isOk()) {
return 1;
}
return 0;
}
};
PowerStatsUtil::PowerStatsUtil() {
mDataProviders.emplace_back(std::make_unique<CstateDataProvider>());
mDataProviders.emplace_back(std::make_unique<PwrStatsHalDataProvider>());
}
int PowerStatsUtil::getData(std::unordered_map<std::string, uint64_t>& data) {
data.clear();
for (auto&& provider : mDataProviders) {
int ret = provider->get(data);
if (ret != 0) {
return ret;
}
}
return 0;
}
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