1 /* 2 * Copyright (C) 2015 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 17 package com.android.car; 18 19 import static android.os.SystemClock.elapsedRealtime; 20 21 import android.annotation.Nullable; 22 import android.app.Service; 23 import android.content.Intent; 24 import android.hardware.automotive.vehicle.V2_0.IVehicle; 25 import android.os.Build; 26 import android.os.IBinder; 27 import android.os.IHwBinder.DeathRecipient; 28 import android.os.Process; 29 import android.os.RemoteException; 30 import android.os.ServiceManager; 31 import android.os.SystemClock; 32 import android.os.SystemProperties; 33 import android.os.Trace; 34 import android.util.EventLog; 35 import android.util.Slog; 36 37 import com.android.car.internal.common.EventLogTags; 38 import com.android.car.systeminterface.SystemInterface; 39 import com.android.car.util.LimitedTimingsTraceLog; 40 import com.android.internal.annotations.VisibleForTesting; 41 import com.android.internal.util.RingBufferIndices; 42 43 import java.io.FileDescriptor; 44 import java.io.PrintWriter; 45 import java.util.NoSuchElementException; 46 47 public class CarService extends Service { 48 public static final String CAR_SERVICE_INIT_TIMING_TAG = "CAR.InitTiming"; 49 public static final int CAR_SERVICE_INIT_TIMING_MIN_DURATION_MS = 5; 50 51 private static final boolean RESTART_CAR_SERVICE_WHEN_VHAL_CRASH = true; 52 53 private static final long WAIT_FOR_VEHICLE_HAL_TIMEOUT_MS = 10_000; 54 55 private static final boolean IS_USER_BUILD = "user".equals(Build.TYPE); 56 57 private ICarImpl mICarImpl; 58 private IVehicle mVehicle; 59 60 private String mVehicleInterfaceName; 61 62 private final VehicleDeathRecipient mVehicleDeathRecipient = new VehicleDeathRecipient(); 63 64 @Override onCreate()65 public void onCreate() { 66 LimitedTimingsTraceLog initTiming = new LimitedTimingsTraceLog(CAR_SERVICE_INIT_TIMING_TAG, 67 Trace.TRACE_TAG_SYSTEM_SERVER, CAR_SERVICE_INIT_TIMING_MIN_DURATION_MS); 68 initTiming.traceBegin("CarService.onCreate"); 69 70 initTiming.traceBegin("getVehicle"); 71 mVehicle = getVehicle(); 72 initTiming.traceEnd(); 73 74 EventLog.writeEvent(EventLogTags.CAR_SERVICE_CREATE, mVehicle == null ? 0 : 1); 75 76 if (mVehicle == null) { 77 throw new IllegalStateException("Vehicle HAL service is not available."); 78 } 79 try { 80 mVehicleInterfaceName = mVehicle.interfaceDescriptor(); 81 } catch (RemoteException e) { 82 throw new IllegalStateException("Unable to get Vehicle HAL interface descriptor", e); 83 } 84 85 Slog.i(CarLog.TAG_SERVICE, "Connected to " + mVehicleInterfaceName); 86 EventLog.writeEvent(EventLogTags.CAR_SERVICE_CONNECTED, mVehicleInterfaceName); 87 88 mICarImpl = new ICarImpl(this, 89 mVehicle, 90 SystemInterface.Builder.defaultSystemInterface(this).build(), 91 mVehicleInterfaceName); 92 mICarImpl.init(); 93 94 linkToDeath(mVehicle, mVehicleDeathRecipient); 95 96 ServiceManager.addService("car_service", mICarImpl); 97 SystemProperties.set("boot.car_service_created", "1"); 98 99 super.onCreate(); 100 101 initTiming.traceEnd(); // "CarService.onCreate" 102 } 103 104 // onDestroy is best-effort and might not get called on shutdown/reboot. As such it is not 105 // suitable for permanently saving state or other need-to-happen operation. If you have a 106 // cleanup task that you want to make sure happens on shutdown/reboot, see OnShutdownReboot. 107 @Override onDestroy()108 public void onDestroy() { 109 EventLog.writeEvent(EventLogTags.CAR_SERVICE_CREATE, mVehicle == null ? 0 : 1); 110 Slog.i(CarLog.TAG_SERVICE, "Service onDestroy"); 111 mICarImpl.release(); 112 113 if (mVehicle != null) { 114 try { 115 mVehicle.unlinkToDeath(mVehicleDeathRecipient); 116 mVehicle = null; 117 } catch (RemoteException e) { 118 // Ignore errors on shutdown path. 119 } 120 } 121 122 super.onDestroy(); 123 } 124 125 @Override onStartCommand(Intent intent, int flags, int startId)126 public int onStartCommand(Intent intent, int flags, int startId) { 127 // keep it alive. 128 return START_STICKY; 129 } 130 131 @Override onBind(Intent intent)132 public IBinder onBind(Intent intent) { 133 return mICarImpl; 134 } 135 136 @Override dump(FileDescriptor fd, PrintWriter writer, String[] args)137 protected void dump(FileDescriptor fd, PrintWriter writer, String[] args) { 138 // historically, the way to get a dumpsys from CarService has been to use 139 // "dumpsys activity service com.android.car/.CarService" - leaving this 140 // as a forward to car_service makes the previously well-known command still work 141 mICarImpl.dump(fd, writer, args); 142 } 143 144 @Nullable getVehicleWithTimeout(long waitMilliseconds)145 private IVehicle getVehicleWithTimeout(long waitMilliseconds) { 146 IVehicle vehicle = getVehicle(); 147 long start = elapsedRealtime(); 148 while (vehicle == null && (start + waitMilliseconds) > elapsedRealtime()) { 149 try { 150 Thread.sleep(100); 151 } catch (InterruptedException e) { 152 throw new RuntimeException("Sleep was interrupted", e); 153 } 154 155 vehicle = getVehicle(); 156 } 157 158 return vehicle; 159 } 160 161 @Nullable getVehicle()162 private static IVehicle getVehicle() { 163 final String instanceName = SystemProperties.get("ro.vehicle.hal", "default"); 164 165 try { 166 return android.hardware.automotive.vehicle.V2_0.IVehicle.getService(instanceName); 167 } catch (RemoteException e) { 168 Slog.e(CarLog.TAG_SERVICE, "Failed to get IVehicle/" + instanceName + " service", e); 169 } catch (NoSuchElementException e) { 170 Slog.e(CarLog.TAG_SERVICE, "IVehicle/" + instanceName + " service not registered yet"); 171 } 172 return null; 173 } 174 175 private class VehicleDeathRecipient implements DeathRecipient { 176 177 @Override serviceDied(long cookie)178 public void serviceDied(long cookie) { 179 EventLog.writeEvent(EventLogTags.CAR_SERVICE_VHAL_DIED, cookie); 180 Slog.wtf(CarLog.TAG_SERVICE, "***Vehicle HAL died. Car service will restart***"); 181 Process.killProcess(Process.myPid()); 182 } 183 } 184 linkToDeath(IVehicle vehicle, DeathRecipient recipient)185 private static void linkToDeath(IVehicle vehicle, DeathRecipient recipient) { 186 try { 187 vehicle.linkToDeath(recipient, 0); 188 } catch (RemoteException e) { 189 throw new IllegalStateException("Failed to linkToDeath Vehicle HAL"); 190 } 191 } 192 193 @VisibleForTesting 194 static class CrashTracker { 195 private final int mMaxCrashCountLimit; 196 private final int mSlidingWindowMillis; 197 198 private final long[] mCrashTimestamps; 199 private final RingBufferIndices mCrashTimestampsIndices; 200 private final Runnable mCallback; 201 202 /** 203 * If maxCrashCountLimit number of crashes occurred within slidingWindowMillis time frame 204 * then call provided callback function. 205 */ CrashTracker(int maxCrashCountLimit, int slidingWindowMillis, Runnable callback)206 CrashTracker(int maxCrashCountLimit, int slidingWindowMillis, Runnable callback) { 207 mMaxCrashCountLimit = maxCrashCountLimit; 208 mSlidingWindowMillis = slidingWindowMillis; 209 mCallback = callback; 210 211 mCrashTimestamps = new long[maxCrashCountLimit]; 212 mCrashTimestampsIndices = new RingBufferIndices(mMaxCrashCountLimit); 213 } 214 crashDetected()215 void crashDetected() { 216 long lastCrash = SystemClock.elapsedRealtime(); 217 mCrashTimestamps[mCrashTimestampsIndices.add()] = lastCrash; 218 219 if (mCrashTimestampsIndices.size() == mMaxCrashCountLimit) { 220 long firstCrash = mCrashTimestamps[mCrashTimestampsIndices.indexOf(0)]; 221 222 if (lastCrash - firstCrash < mSlidingWindowMillis) { 223 mCallback.run(); 224 } 225 } 226 } 227 } 228 } 229