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>

powerstats/UfsStateResidencyDataProvider.cpp

@@ -0,0 +1,82 @@
+/*
+ * 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 "UfsStateResidencyDataProvider.h"
+
+#include <android-base/logging.h>
+#include <android-base/parseint.h>
+#include <android-base/strings.h>
+
+#include <string>
+#include <utility>
+
+using android::base::ParseInt;
+using android::base::Split;
+using android::base::StartsWith;
+using android::base::Trim;
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace power {
+namespace stats {
+
+const int32_t HIBERNATE_STATE_ID = 0;
+const std::string UFS_NAME = "UFS";
+
+UfsStateResidencyDataProvider::UfsStateResidencyDataProvider(std::string prefix) : kPrefix(prefix) {}
+
+bool UfsStateResidencyDataProvider::getStateResidencies(
+        std::unordered_map<std::string, std::vector<StateResidency>> *residencies) {
+    StateResidency residency;
+    residency.id = HIBERNATE_STATE_ID;
+
+        // The transform function converts microseconds to milliseconds.
+    std::function<uint64_t(uint64_t)> usecToMs = [](uint64_t a) { return a / 1000; };
+
+    residency.totalTimeInStateMs = usecToMs(readStat(kPrefix + "hibern8_total_us"));
+    residency.totalStateEntryCount = readStat(kPrefix + "hibern8_exit_cnt");
+    residency.lastEntryTimestampMs = usecToMs(readStat(kPrefix + "last_hibern8_enter_time"));
+
+    residencies->emplace(UFS_NAME, std::vector<StateResidency>{residency});
+    return true;
+}
+
+std::unordered_map<std::string, std::vector<State>> UfsStateResidencyDataProvider::getInfo() {
+    return {{UFS_NAME, std::vector<State>{{HIBERNATE_STATE_ID, "HIBERN8"}} }};
+}
+
+int64_t UfsStateResidencyDataProvider::readStat(std::string path) {
+    std::unique_ptr<FILE, decltype(&fclose)> fp(fopen(path.c_str(), "r"), fclose);
+    if (!fp) {
+        PLOG(ERROR) << __func__ << ":Failed to open file " << path
+                    << " Error = " << strerror(errno);
+        return 0;
+    }
+    const size_t size = 20;
+    char buf[size];
+    (void)fread(&buf, sizeof(char), size, fp.get());
+    int64_t ret;
+    if (!ParseInt(Trim(std::string(buf)), &ret)) {
+        LOG(ERROR) << "Failed to parse int64 from [" << std::string(buf) << "]";
+    }
+    return ret;
+}
+
+}  // namespace stats
+}  // namespace power
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl