Added input freeze reason string.

To help debug b/27576902

Bug: 27576902
Change-Id: Ic3d2bb25842593efb11e195a1bbe19bed3bf7067

2 files changed, 20 insertions, 1 deletions

diff --git a/services/core/java/com/android/server/wm/InputMonitor.java b/services/core/java/com/android/server/wm/InputMonitor.java
index e42658e5a2f7..b70218059b74 100644
--- a/services/core/java/com/android/server/wm/InputMonitor.java
+++ b/services/core/java/com/android/server/wm/InputMonitor.java
@@ -24,6 +24,7 @@ import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM;
 
 import android.app.ActivityManagerNative;
 import android.graphics.Rect;
+import android.os.Debug;
 import android.os.RemoteException;
 import android.util.Log;
 import android.util.Slog;
@@ -36,6 +37,7 @@ import com.android.server.input.InputApplicationHandle;
 import com.android.server.input.InputManagerService;
 import com.android.server.input.InputWindowHandle;
 
+import java.io.PrintWriter;
 import java.util.Arrays;
 
 final class InputMonitor implements InputManagerService.WindowManagerCallbacks {
@@ -47,6 +49,9 @@ final class InputMonitor implements InputManagerService.WindowManagerCallbacks {
     // When true, prevents input dispatch from proceeding until set to false again.
     private boolean mInputDispatchFrozen;
 
+    // The reason the input is currently frozen or null if the input isn't frozen.
+    private String mInputFreezeReason = null;
+
     // When true, input dispatch proceeds normally.  Otherwise all events are dropped.
     // Initially false, so that input does not get dispatched until boot is finished at
     // which point the ActivityManager will enable dispatching.
@@ -474,12 +479,16 @@ final class InputMonitor implements InputManagerService.WindowManagerCallbacks {
     }
 
     public void freezeInputDispatchingLw() {
-        if (! mInputDispatchFrozen) {
+        if (!mInputDispatchFrozen) {
             if (DEBUG_INPUT) {
                 Slog.v(TAG_WM, "Freezing input dispatching");
             }
 
             mInputDispatchFrozen = true;
+
+            if (DEBUG_INPUT || true) {
+                mInputFreezeReason = Debug.getCallers(6);
+            }
             updateInputDispatchModeLw();
         }
     }
@@ -491,6 +500,7 @@ final class InputMonitor implements InputManagerService.WindowManagerCallbacks {
             }
 
             mInputDispatchFrozen = false;
+            mInputFreezeReason = null;
             updateInputDispatchModeLw();
         }
     }
@@ -509,4 +519,10 @@ final class InputMonitor implements InputManagerService.WindowManagerCallbacks {
     private void updateInputDispatchModeLw() {
         mService.mInputManager.setInputDispatchMode(mInputDispatchEnabled, mInputDispatchFrozen);
     }
+
+    void dump(PrintWriter pw, String prefix) {
+        if (mInputFreezeReason != null) {
+            pw.println(prefix + "mInputFreezeReason=" + mInputFreezeReason);
+        }
+    }
 }
diff --git a/services/core/java/com/android/server/wm/WindowManagerService.java b/services/core/java/com/android/server/wm/WindowManagerService.java
index 304449dd9f98..3ef6286ac8e3 100644
--- a/services/core/java/com/android/server/wm/WindowManagerService.java
+++ b/services/core/java/com/android/server/wm/WindowManagerService.java
@@ -9907,6 +9907,9 @@ public class WindowManagerService extends IWindowManager.Stub
                     pw.print(mLastFinishedFreezeSource);
                 }
                 pw.println();
+
+        mInputMonitor.dump(pw, "  ");
+
         if (dumpAll) {
             pw.print("  mSystemDecorLayer="); pw.print(mSystemDecorLayer);
                     pw.print(" mScreenRect="); pw.println(mScreenRect.toShortString());