Makoto Onuki | ce643a3 | 2017-11-20 14:31:06 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package com.android.server.power.batterysaver; |
| 17 | |
| 18 | import android.util.ArrayMap; |
| 19 | import android.util.Slog; |
| 20 | |
| 21 | import com.android.internal.annotations.GuardedBy; |
| 22 | |
| 23 | import java.util.Map; |
| 24 | |
| 25 | |
| 26 | /** |
| 27 | * Helper to parse a list of "core-number:frequency" pairs concatenated with / as a separator, |
| 28 | * and convert them into a map of "filename -> value" that should be written to |
| 29 | * /sys/.../scaling_max_freq. |
| 30 | * |
| 31 | * Example input: "0:1900800/4:2500000", which will be converted into: |
| 32 | * "/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq" "1900800" |
| 33 | * "/sys/devices/system/cpu/cpu4/cpufreq/scaling_max_freq" "2500000" |
| 34 | * |
| 35 | * Test: |
| 36 | atest $ANDROID_BUILD_TOP/frameworks/base/services/tests/servicestests/src/com/android/server/power/batterysaver/CpuFrequenciesTest.java |
| 37 | */ |
| 38 | public class CpuFrequencies { |
| 39 | private static final String TAG = "CpuFrequencies"; |
| 40 | |
| 41 | private final Object mLock = new Object(); |
| 42 | |
| 43 | @GuardedBy("mLock") |
| 44 | private final ArrayMap<Integer, Long> mCoreAndFrequencies = new ArrayMap<>(); |
| 45 | |
| 46 | public CpuFrequencies() { |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * Parse a string. |
| 51 | */ |
| 52 | public CpuFrequencies parseString(String cpuNumberAndFrequencies) { |
| 53 | synchronized (mLock) { |
| 54 | mCoreAndFrequencies.clear(); |
| 55 | try { |
| 56 | for (String pair : cpuNumberAndFrequencies.split("/")) { |
Makoto Onuki | afd6ff3 | 2017-11-30 14:37:26 -0800 | [diff] [blame^] | 57 | pair = pair.trim(); |
| 58 | if (pair.length() == 0) { |
| 59 | continue; |
| 60 | } |
Makoto Onuki | ce643a3 | 2017-11-20 14:31:06 -0800 | [diff] [blame] | 61 | final String[] coreAndFreq = pair.split(":", 2); |
| 62 | |
| 63 | if (coreAndFreq.length != 2) { |
| 64 | throw new IllegalArgumentException("Wrong format"); |
| 65 | } |
| 66 | final int core = Integer.parseInt(coreAndFreq[0]); |
| 67 | final long freq = Long.parseLong(coreAndFreq[1]); |
| 68 | |
| 69 | mCoreAndFrequencies.put(core, freq); |
| 70 | } |
| 71 | } catch (IllegalArgumentException e) { |
Makoto Onuki | afd6ff3 | 2017-11-30 14:37:26 -0800 | [diff] [blame^] | 72 | Slog.wtf(TAG, "Invalid configuration: '" + cpuNumberAndFrequencies + "'"); |
Makoto Onuki | ce643a3 | 2017-11-20 14:31:06 -0800 | [diff] [blame] | 73 | } |
| 74 | } |
| 75 | return this; |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * Return a new map containing the filename-value pairs. |
| 80 | */ |
| 81 | public ArrayMap<String, String> toSysFileMap() { |
| 82 | final ArrayMap<String, String> map = new ArrayMap<>(); |
| 83 | addToSysFileMap(map); |
| 84 | return map; |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * Add the filename-value pairs to an existing map. |
| 89 | */ |
| 90 | public void addToSysFileMap(Map<String, String> map) { |
| 91 | synchronized (mLock) { |
| 92 | final int size = mCoreAndFrequencies.size(); |
| 93 | |
| 94 | for (int i = 0; i < size; i++) { |
| 95 | final int core = mCoreAndFrequencies.keyAt(i); |
| 96 | final long freq = mCoreAndFrequencies.valueAt(i); |
| 97 | |
| 98 | final String file = "/sys/devices/system/cpu/cpu" + Integer.toString(core) + |
| 99 | "/cpufreq/scaling_max_freq"; |
| 100 | |
| 101 | map.put(file, Long.toString(freq)); |
| 102 | } |
| 103 | } |
| 104 | } |
| 105 | } |