Fix deadlock between VrManager, ActivityManager and WindowManager

Let WM register to listen for Vr mode state changes and keep
track of it locally to avoid calling out to vr manager.

Bug: 28342910
Change-Id: I071666fab7319f315021f48058177dd3141acc3a

services/core/java/com/android/server/policy/ImmersiveModeConfirmation.java

@@ -32,6 +32,7 @@ import android.os.ServiceManager;
 import android.os.UserHandle;
 import android.provider.Settings;
 import android.service.vr.IVrManager;
+import android.service.vr.IVrStateCallbacks;
 import android.util.DisplayMetrics;
 import android.util.Slog;
 import android.util.SparseBooleanArray;
@@ -70,7 +71,9 @@ public class ImmersiveModeConfirmation {
     private long mPanicTime;
     private WindowManager mWindowManager;
     private int mCurrentUserId;
-    private IVrManager mVrManager;
+    // Local copy of vr mode enabled state, to avoid calling into VrManager with
+    // the lock held.
+    boolean mVrModeEnabled = false;
 
     public ImmersiveModeConfirmation(Context context) {
         mContext = context;
@@ -117,22 +120,19 @@ public class ImmersiveModeConfirmation {
         }
     }
 
-    private boolean getVrMode() {
-        boolean vrMode = false;
-        if (mVrManager == null) {
-            // lazily grab this service since it may not be available at construction time
-            mVrManager = (IVrManager) IVrManager.Stub.asInterface(
+    void systemReady() {
+        IVrManager vrManager = IVrManager.Stub.asInterface(
                 ServiceManager.getService(VrManagerService.VR_MANAGER_BINDER_SERVICE));
-        }
-        if (mVrManager != null) {
+        if (vrManager != null) {
             try {
-                vrMode = mVrManager.getVrModeState();
-            } catch (RemoteException ex) { }
+                vrManager.registerListener(mVrStateCallbacks);
+                mVrModeEnabled = vrManager.getVrModeState();
+            } catch (RemoteException re) {
+            }
         }
-        return vrMode;
     }
 
-    public void immersiveModeChanged(String pkg, boolean isImmersiveMode,
+    public void immersiveModeChangedLw(String pkg, boolean isImmersiveMode,
             boolean userSetupComplete) {
         mHandler.removeMessages(H.SHOW);
         if (isImmersiveMode) {
@@ -142,7 +142,7 @@ public class ImmersiveModeConfirmation {
             if (!disabled
                     && (DEBUG_SHOW_EVERY_TIME || !mConfirmed)
                     && userSetupComplete
-                    && !getVrMode()) {
+                    && !mVrModeEnabled) {
                 mHandler.sendEmptyMessageDelayed(H.SHOW, mShowDelayMs);
             }
         } else {
@@ -375,4 +375,11 @@ public class ImmersiveModeConfirmation {
             }
         }
     }
+
+    private final IVrStateCallbacks mVrStateCallbacks = new IVrStateCallbacks.Stub() {
+        @Override
+        public void onVrStateChanged(boolean enabled) throws RemoteException {
+            mVrModeEnabled = enabled;
+        }
+    };
 }

services/core/java/com/android/server/policy/PhoneWindowManager.java

@@ -6643,6 +6643,7 @@ public class PhoneWindowManager implements WindowManagerPolicy {
             mKeyguardDelegate.onBootCompleted();
         }
         mSystemGestures.systemReady();
+        mImmersiveModeConfirmation.systemReady();
     }
 
     /** {@inheritDoc} */
@@ -7347,7 +7348,7 @@ public class PhoneWindowManager implements WindowManagerPolicy {
         boolean newImmersiveMode = isImmersiveMode(vis);
         if (win != null && oldImmersiveMode != newImmersiveMode) {
             final String pkg = win.getOwningPackage();
-            mImmersiveModeConfirmation.immersiveModeChanged(pkg, newImmersiveMode,
+            mImmersiveModeConfirmation.immersiveModeChangedLw(pkg, newImmersiveMode,
                     isUserSetupComplete());
         }