powerstats: add common data providers in gs common
Bug: 206576142
Test: dumpsys android.hardware.power.stats.IPowerStats/default
Change-Id: Iee66356150a8bdfcd1e0b3fe8b8d5ec9f601f543
Signed-off-by: Darren Hsu <darrenhsu@google.com>
diff --git a/powerstats/DevfreqStateResidencyDataProvider.cpp b/powerstats/DevfreqStateResidencyDataProvider.cpp
new file mode 100644
index 0000000..d59e1e5
--- /dev/null
+++ b/powerstats/DevfreqStateResidencyDataProvider.cpp
@@ -0,0 +1,111 @@
+/*
+ * 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) + "MHz"};
+ states.push_back(s);
+ }
+
+ return {{mName, states}};
+}
+
+} // namespace stats
+} // namespace power
+} // namespace hardware
+} // namespace android
+} // namespace aidl