diff --git a/libs/gui/ISurfaceComposer.cpp b/libs/gui/ISurfaceComposer.cpp
index 53721cf..71e18a9 100644
--- a/libs/gui/ISurfaceComposer.cpp
+++ b/libs/gui/ISurfaceComposer.cpp
@@ -824,6 +824,36 @@
         return error;
     }
 
+    virtual status_t addTunnelModeEnabledListener(
+            const sp<gui::ITunnelModeEnabledListener>& listener) {
+        Parcel data, reply;
+        SAFE_PARCEL(data.writeInterfaceToken, ISurfaceComposer::getInterfaceDescriptor());
+        SAFE_PARCEL(data.writeStrongBinder, IInterface::asBinder(listener));
+
+        const status_t error =
+                remote()->transact(BnSurfaceComposer::ADD_TUNNEL_MODE_ENABLED_LISTENER, data,
+                                   &reply);
+        if (error != NO_ERROR) {
+            ALOGE("addTunnelModeEnabledListener: Failed to transact");
+        }
+        return error;
+    }
+
+    virtual status_t removeTunnelModeEnabledListener(
+            const sp<gui::ITunnelModeEnabledListener>& listener) {
+        Parcel data, reply;
+        SAFE_PARCEL(data.writeInterfaceToken, ISurfaceComposer::getInterfaceDescriptor());
+        SAFE_PARCEL(data.writeStrongBinder, IInterface::asBinder(listener));
+
+        const status_t error =
+                remote()->transact(BnSurfaceComposer::REMOVE_TUNNEL_MODE_ENABLED_LISTENER, data,
+                                   &reply);
+        if (error != NO_ERROR) {
+            ALOGE("removeTunnelModeEnabledListener: Failed to transact");
+        }
+        return error;
+    }
+
     status_t setDesiredDisplayModeSpecs(const sp<IBinder>& displayToken,
                                         ui::DisplayModeId defaultMode, bool allowGroupSwitching,
                                         float primaryRefreshRateMin, float primaryRefreshRateMax,
@@ -1740,6 +1770,26 @@
             }
             return removeFpsListener(listener);
         }
+        case ADD_TUNNEL_MODE_ENABLED_LISTENER: {
+            CHECK_INTERFACE(ISurfaceComposer, data, reply);
+            sp<gui::ITunnelModeEnabledListener> listener;
+            status_t result = data.readNullableStrongBinder(&listener);
+            if (result != NO_ERROR) {
+                ALOGE("addTunnelModeEnabledListener: Failed to read listener");
+                return result;
+            }
+            return addTunnelModeEnabledListener(listener);
+        }
+        case REMOVE_TUNNEL_MODE_ENABLED_LISTENER: {
+            CHECK_INTERFACE(ISurfaceComposer, data, reply);
+            sp<gui::ITunnelModeEnabledListener> listener;
+            status_t result = data.readNullableStrongBinder(&listener);
+            if (result != NO_ERROR) {
+                ALOGE("removeTunnelModeEnabledListener: Failed to read listener");
+                return result;
+            }
+            return removeTunnelModeEnabledListener(listener);
+        }
         case SET_DESIRED_DISPLAY_MODE_SPECS: {
             CHECK_INTERFACE(ISurfaceComposer, data, reply);
             sp<IBinder> displayToken = data.readStrongBinder();
diff --git a/libs/gui/SurfaceComposerClient.cpp b/libs/gui/SurfaceComposerClient.cpp
index aa93808..80ff653 100644
--- a/libs/gui/SurfaceComposerClient.cpp
+++ b/libs/gui/SurfaceComposerClient.cpp
@@ -2077,6 +2077,16 @@
     return ComposerService::getComposerService()->removeFpsListener(listener);
 }
 
+status_t SurfaceComposerClient::addTunnelModeEnabledListener(
+        const sp<gui::ITunnelModeEnabledListener>& listener) {
+    return ComposerService::getComposerService()->addTunnelModeEnabledListener(listener);
+}
+
+status_t SurfaceComposerClient::removeTunnelModeEnabledListener(
+        const sp<gui::ITunnelModeEnabledListener>& listener) {
+    return ComposerService::getComposerService()->removeTunnelModeEnabledListener(listener);
+}
+
 bool SurfaceComposerClient::getDisplayBrightnessSupport(const sp<IBinder>& displayToken) {
     bool support = false;
     ComposerService::getComposerService()->getDisplayBrightnessSupport(displayToken, &support);
diff --git a/libs/gui/aidl/android/gui/ITunnelModeEnabledListener.aidl b/libs/gui/aidl/android/gui/ITunnelModeEnabledListener.aidl
new file mode 100644
index 0000000..2a89cca
--- /dev/null
+++ b/libs/gui/aidl/android/gui/ITunnelModeEnabledListener.aidl
@@ -0,0 +1,29 @@
+/*
+ * Copyright 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.
+ */
+
+package android.gui;
+
+/** @hide */
+oneway interface ITunnelModeEnabledListener {
+
+    /**
+     * Called when tunnel mode status has changed. Tunnel mode is:
+     *  - enabled when there is a sideband stream attached to one of the layers in
+     *    surface flinger
+     *  - disabled when there is no layer with a sideband stream
+     */
+    void onTunnelModeEnabledChanged(boolean enabled);
+}
diff --git a/libs/gui/include/gui/ISurfaceComposer.h b/libs/gui/include/gui/ISurfaceComposer.h
index cb04689..439d90a 100644
--- a/libs/gui/include/gui/ISurfaceComposer.h
+++ b/libs/gui/include/gui/ISurfaceComposer.h
@@ -21,6 +21,7 @@
 #include <android/gui/IHdrLayerInfoListener.h>
 #include <android/gui/IScreenCaptureListener.h>
 #include <android/gui/ITransactionTraceListener.h>
+#include <android/gui/ITunnelModeEnabledListener.h>
 #include <binder/IBinder.h>
 #include <binder/IInterface.h>
 #include <gui/FrameTimelineInfo.h>
@@ -377,6 +378,21 @@
      */
     virtual status_t removeFpsListener(const sp<gui::IFpsListener>& listener) = 0;
 
+    /* Registers a listener to receive tunnel mode enabled updates from SurfaceFlinger.
+     *
+     * Requires ACCESS_SURFACE_FLINGER permission.
+     */
+    virtual status_t addTunnelModeEnabledListener(
+            const sp<gui::ITunnelModeEnabledListener>& listener) = 0;
+
+    /*
+     * Removes a listener that was receiving tunnel mode enabled updates from SurfaceFlinger.
+     *
+     * Requires ACCESS_SURFACE_FLINGER permission.
+     */
+    virtual status_t removeTunnelModeEnabledListener(
+            const sp<gui::ITunnelModeEnabledListener>& listener) = 0;
+
     /* Sets the refresh rate boundaries for the display.
      *
      * The primary refresh rate range represents display manager's general guidance on the display
@@ -607,6 +623,8 @@
         ADD_HDR_LAYER_INFO_LISTENER,
         REMOVE_HDR_LAYER_INFO_LISTENER,
         ON_PULL_ATOM,
+        ADD_TUNNEL_MODE_ENABLED_LISTENER,
+        REMOVE_TUNNEL_MODE_ENABLED_LISTENER,
         // Always append new enum to the end.
     };
 
diff --git a/libs/gui/include/gui/SurfaceComposerClient.h b/libs/gui/include/gui/SurfaceComposerClient.h
index 0940e9d..2582882 100644
--- a/libs/gui/include/gui/SurfaceComposerClient.h
+++ b/libs/gui/include/gui/SurfaceComposerClient.h
@@ -50,6 +50,7 @@
 class ISurfaceComposerClient;
 class IGraphicBufferProducer;
 class IRegionSamplingListener;
+class ITunnelModeEnabledListener;
 class Region;
 
 struct SurfaceControlStats {
@@ -610,6 +611,10 @@
     static status_t removeRegionSamplingListener(const sp<IRegionSamplingListener>& listener);
     static status_t addFpsListener(int32_t taskId, const sp<gui::IFpsListener>& listener);
     static status_t removeFpsListener(const sp<gui::IFpsListener>& listener);
+    static status_t addTunnelModeEnabledListener(
+            const sp<gui::ITunnelModeEnabledListener>& listener);
+    static status_t removeTunnelModeEnabledListener(
+            const sp<gui::ITunnelModeEnabledListener>& listener);
 
 private:
     virtual void onFirstRef();
diff --git a/libs/gui/tests/Surface_test.cpp b/libs/gui/tests/Surface_test.cpp
index ea8c295..b8d34c3 100644
--- a/libs/gui/tests/Surface_test.cpp
+++ b/libs/gui/tests/Surface_test.cpp
@@ -845,6 +845,16 @@
         return NO_ERROR;
     }
     status_t removeFpsListener(const sp<gui::IFpsListener>& /*listener*/) { return NO_ERROR; }
+
+    status_t addTunnelModeEnabledListener(const sp<gui::ITunnelModeEnabledListener>& /*listener*/) {
+        return NO_ERROR;
+    }
+
+    status_t removeTunnelModeEnabledListener(
+            const sp<gui::ITunnelModeEnabledListener>& /*listener*/) {
+        return NO_ERROR;
+    }
+
     status_t setDesiredDisplayModeSpecs(const sp<IBinder>& /*displayToken*/,
                                         ui::DisplayModeId /*defaultMode*/,
                                         bool /*allowGroupSwitching*/,