diff --git a/libs/binder/BackendUnifiedServiceManager.cpp b/libs/binder/BackendUnifiedServiceManager.cpp
index f7b9f05..d32eecd 100644
--- a/libs/binder/BackendUnifiedServiceManager.cpp
+++ b/libs/binder/BackendUnifiedServiceManager.cpp
@@ -105,7 +105,8 @@
 };
 
 bool BinderCacheWithInvalidation::isClientSideCachingEnabled(const std::string& serviceName) {
-    if (ProcessState::self()->getThreadPoolMaxTotalThreadCount() <= 0) {
+    sp<ProcessState> self = ProcessState::selfOrNull();
+    if (!self || self->getThreadPoolMaxTotalThreadCount() <= 0) {
         ALOGW("Thread Pool max thread count is 0. Cannot cache binder as linkToDeath cannot be "
               "implemented. serviceName: %s",
               serviceName.c_str());
@@ -172,10 +173,6 @@
     mCacheForGetService = std::make_shared<BinderCacheWithInvalidation>();
 }
 
-sp<AidlServiceManager> BackendUnifiedServiceManager::getImpl() {
-    return mTheRealServiceManager;
-}
-
 Status BackendUnifiedServiceManager::getService(const ::std::string& name,
                                                 sp<IBinder>* _aidl_return) {
     os::Service service;
diff --git a/libs/binder/BackendUnifiedServiceManager.h b/libs/binder/BackendUnifiedServiceManager.h
index feb8470..abc0eda 100644
--- a/libs/binder/BackendUnifiedServiceManager.h
+++ b/libs/binder/BackendUnifiedServiceManager.h
@@ -121,7 +121,6 @@
 public:
     explicit BackendUnifiedServiceManager(const sp<os::IServiceManager>& impl);
 
-    sp<os::IServiceManager> getImpl();
     binder::Status getService(const ::std::string& name, sp<IBinder>* _aidl_return) override;
     binder::Status getService2(const ::std::string& name, os::Service* out) override;
     binder::Status checkService(const ::std::string& name, os::Service* out) override;
diff --git a/libs/binder/IServiceManager.cpp b/libs/binder/IServiceManager.cpp
index 32388db..39d8c24 100644
--- a/libs/binder/IServiceManager.cpp
+++ b/libs/binder/IServiceManager.cpp
@@ -561,8 +561,9 @@
     sp<IBinder> svc = checkService(name);
     if (svc != nullptr) return svc;
 
+    sp<ProcessState> self = ProcessState::selfOrNull();
     const bool isVendorService =
-        strcmp(ProcessState::self()->getDriverName().c_str(), "/dev/vndbinder") == 0;
+            self && strcmp(self->getDriverName().c_str(), "/dev/vndbinder") == 0;
     constexpr auto timeout = 5s;
     const auto startTime = std::chrono::steady_clock::now();
     // Vendor code can't access system properties
@@ -579,7 +580,7 @@
     const useconds_t sleepTime = gSystemBootCompleted ? 1000 : 100;
 
     ALOGI("Waiting for service '%s' on '%s'...", String8(name).c_str(),
-          ProcessState::self()->getDriverName().c_str());
+          self ? self->getDriverName().c_str() : "RPC accessors only");
 
     int n = 0;
     while (std::chrono::steady_clock::now() - startTime < timeout) {
@@ -661,7 +662,8 @@
     if (Status status = realGetService(name, &out); !status.isOk()) {
         ALOGW("Failed to getService in waitForService for %s: %s", name.c_str(),
               status.toString8().c_str());
-        if (0 == ProcessState::self()->getThreadPoolMaxTotalThreadCount()) {
+        sp<ProcessState> self = ProcessState::selfOrNull();
+        if (self && 0 == self->getThreadPoolMaxTotalThreadCount()) {
             ALOGW("Got service, but may be racey because we could not wait efficiently for it. "
                   "Threadpool has 0 guaranteed threads. "
                   "Is the threadpool configured properly? "
@@ -695,9 +697,10 @@
             if (waiter->mBinder != nullptr) return waiter->mBinder;
         }
 
+        sp<ProcessState> self = ProcessState::selfOrNull();
         ALOGW("Waited one second for %s (is service started? Number of threads started in the "
               "threadpool: %zu. Are binder threads started and available?)",
-              name.c_str(), ProcessState::self()->getThreadPoolMaxTotalThreadCount());
+              name.c_str(), self ? self->getThreadPoolMaxTotalThreadCount() : 0);
 
         // Handle race condition for lazy services. Here is what can happen:
         // - the service dies (not processed by init yet).
diff --git a/libs/binder/rust/Android.bp b/libs/binder/rust/Android.bp
index 020ebcc..8404a48 100644
--- a/libs/binder/rust/Android.bp
+++ b/libs/binder/rust/Android.bp
@@ -139,6 +139,9 @@
         "--raw-line",
         "use libc::sockaddr;",
     ],
+    cflags: [
+        "-DANDROID_PLATFORM",
+    ],
     shared_libs: [
         "libbinder_ndk",
     ],
@@ -179,6 +182,9 @@
         // rustified
         "libbinder_ndk_bindgen_flags.txt",
     ],
+    cflags: [
+        "-DANDROID_PLATFORM",
+    ],
     shared_libs: [
         "libbinder_ndk_on_trusty_mock",
         "libc++",
diff --git a/libs/binder/rust/Cargo.toml b/libs/binder/rust/Cargo.toml
new file mode 100644
index 0000000..e5738c5
--- /dev/null
+++ b/libs/binder/rust/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "android-binder"
+version = "0.1.0"
+edition = "2021"
+description = "Safe bindings to Android Binder, restricted to the NDK"
+license = "Apache-2.0"
+
+[dependencies]
+binder-ndk-sys = { package = "android-binder-ndk-sys", version = "0.1", path = "./sys" }
+downcast-rs = "1.2.1"
+libc = "0.2.159"
+
+[lints.rust.unexpected_cfgs]
+level = "warn"
+check-cfg = ["cfg(android_vendor)", "cfg(android_ndk)", "cfg(android_vndk)", "cfg(trusty)"]
diff --git a/libs/binder/rust/build.rs b/libs/binder/rust/build.rs
new file mode 100644
index 0000000..f3e6b53
--- /dev/null
+++ b/libs/binder/rust/build.rs
@@ -0,0 +1,4 @@
+fn main() {
+    // Anything with cargo is NDK only. If you want to access anything else, use Soong.
+    println!("cargo::rustc-cfg=android_ndk");
+}
diff --git a/libs/binder/rust/src/binder.rs b/libs/binder/rust/src/binder.rs
index 23026e5..8c0501b 100644
--- a/libs/binder/rust/src/binder.rs
+++ b/libs/binder/rust/src/binder.rs
@@ -207,8 +207,10 @@
 /// Corresponds to TF_ONE_WAY -- an asynchronous call.
 pub const FLAG_ONEWAY: TransactionFlags = sys::FLAG_ONEWAY;
 /// Corresponds to TF_CLEAR_BUF -- clear transaction buffers after call is made.
+#[cfg(not(android_ndk))]
 pub const FLAG_CLEAR_BUF: TransactionFlags = sys::FLAG_CLEAR_BUF;
 /// Set to the vendor flag if we are building for the VNDK, 0 otherwise
+#[cfg(not(android_ndk))]
 pub const FLAG_PRIVATE_LOCAL: TransactionFlags = sys::FLAG_PRIVATE_LOCAL;
 
 /// Internal interface of binder local or remote objects for making
@@ -221,7 +223,7 @@
     fn is_binder_alive(&self) -> bool;
 
     /// Indicate that the service intends to receive caller security contexts.
-    #[cfg(not(android_vndk))]
+    #[cfg(not(any(android_vndk, android_ndk)))]
     fn set_requesting_sid(&mut self, enable: bool);
 
     /// Dump this object to the given file handle
@@ -346,7 +348,6 @@
                 panic!("Expected non-null class pointer from AIBinder_Class_define!");
             }
             sys::AIBinder_Class_setOnDump(class, Some(I::on_dump));
-            sys::AIBinder_Class_setHandleShellCommand(class, None);
             class
         };
         InterfaceClass(ptr)
@@ -714,7 +715,7 @@
 pub struct BinderFeatures {
     /// Indicates that the service intends to receive caller security contexts. This must be true
     /// for `ThreadState::with_calling_sid` to work.
-    #[cfg(not(android_vndk))]
+    #[cfg(not(any(android_vndk, android_ndk)))]
     pub set_requesting_sid: bool,
     // Ensure that clients include a ..BinderFeatures::default() to preserve backwards compatibility
     // when new fields are added. #[non_exhaustive] doesn't work because it prevents struct
@@ -916,8 +917,12 @@
         impl $native {
             /// Create a new binder service.
             pub fn new_binder<T: $interface + Sync + Send + 'static>(inner: T, features: $crate::BinderFeatures) -> $crate::Strong<dyn $interface> {
+                #[cfg(not(android_ndk))]
                 let mut binder = $crate::binder_impl::Binder::new_with_stability($native(Box::new(inner)), $stability);
-                #[cfg(not(android_vndk))]
+                #[cfg(android_ndk)]
+                let mut binder = $crate::binder_impl::Binder::new($native(Box::new(inner)));
+
+                #[cfg(not(any(android_vndk, android_ndk)))]
                 $crate::binder_impl::IBinderInternal::set_requesting_sid(&mut binder, features.set_requesting_sid);
                 $crate::Strong::new(Box::new(binder))
             }
diff --git a/libs/binder/rust/src/lib.rs b/libs/binder/rust/src/lib.rs
index f7f3f35..14493db 100644
--- a/libs/binder/rust/src/lib.rs
+++ b/libs/binder/rust/src/lib.rs
@@ -100,11 +100,11 @@
 mod native;
 mod parcel;
 mod proxy;
-#[cfg(not(trusty))]
+#[cfg(not(any(trusty, android_ndk)))]
 mod service;
-#[cfg(not(trusty))]
+#[cfg(not(any(trusty, android_ndk)))]
 mod state;
-#[cfg(not(any(android_vendor, android_vndk)))]
+#[cfg(not(any(android_vendor, android_ndk, android_vndk)))]
 mod system_only;
 
 use binder_ndk_sys as sys;
@@ -114,15 +114,18 @@
 pub use error::{ExceptionCode, IntoBinderResult, Status, StatusCode};
 pub use parcel::{ParcelFileDescriptor, Parcelable, ParcelableHolder};
 pub use proxy::{DeathRecipient, SpIBinder, WpIBinder};
-#[cfg(not(trusty))]
+#[cfg(not(any(trusty, android_ndk)))]
 pub use service::{
     add_service, check_interface, check_service, force_lazy_services_persist,
-    get_declared_instances, get_interface, get_service, is_declared, is_handling_transaction,
-    register_lazy_service, wait_for_interface, wait_for_service, LazyServiceGuard,
+    get_declared_instances, is_declared, is_handling_transaction, register_lazy_service,
+    wait_for_interface, wait_for_service, LazyServiceGuard,
 };
-#[cfg(not(trusty))]
+#[cfg(not(any(trusty, android_ndk)))]
+#[allow(deprecated)]
+pub use service::{get_interface, get_service};
+#[cfg(not(any(trusty, android_ndk)))]
 pub use state::{ProcessState, ThreadState};
-#[cfg(not(any(android_vendor, android_vndk)))]
+#[cfg(not(any(android_vendor, android_vndk, android_ndk)))]
 pub use system_only::{delegate_accessor, Accessor, ConnectionInfo};
 
 /// Binder result containing a [`Status`] on error.
@@ -134,9 +137,10 @@
     pub use crate::binder::{
         IBinderInternal, InterfaceClass, LocalStabilityType, Remotable, Stability, StabilityType,
         ToAsyncInterface, ToSyncInterface, TransactionCode, TransactionFlags, VintfStabilityType,
-        FIRST_CALL_TRANSACTION, FLAG_CLEAR_BUF, FLAG_ONEWAY, FLAG_PRIVATE_LOCAL,
-        LAST_CALL_TRANSACTION,
+        FIRST_CALL_TRANSACTION, FLAG_ONEWAY, LAST_CALL_TRANSACTION,
     };
+    #[cfg(not(android_ndk))]
+    pub use crate::binder::{FLAG_CLEAR_BUF, FLAG_PRIVATE_LOCAL};
     pub use crate::binder_async::BinderAsyncRuntime;
     pub use crate::error::status_t;
     pub use crate::native::Binder;
diff --git a/libs/binder/rust/src/native.rs b/libs/binder/rust/src/native.rs
index c87cc94..9e1cfd6 100644
--- a/libs/binder/rust/src/native.rs
+++ b/libs/binder/rust/src/native.rs
@@ -14,9 +14,9 @@
  * limitations under the License.
  */
 
-use crate::binder::{
-    AsNative, Interface, InterfaceClassMethods, Remotable, Stability, TransactionCode,
-};
+#[cfg(not(android_ndk))]
+use crate::binder::Stability;
+use crate::binder::{AsNative, Interface, InterfaceClassMethods, Remotable, TransactionCode};
 use crate::error::{status_result, status_t, Result, StatusCode};
 use crate::parcel::{BorrowedParcel, Serialize};
 use crate::proxy::SpIBinder;
@@ -76,14 +76,32 @@
     /// This moves the `rust_object` into an owned [`Box`] and Binder will
     /// manage its lifetime.
     pub fn new(rust_object: T) -> Binder<T> {
-        Self::new_with_stability(rust_object, Stability::default())
+        #[cfg(not(android_ndk))]
+        {
+            Self::new_with_stability(rust_object, Stability::default())
+        }
+        #[cfg(android_ndk)]
+        {
+            Self::new_unmarked(rust_object)
+        }
     }
 
     /// Create a new Binder remotable object with the given stability
     ///
     /// This moves the `rust_object` into an owned [`Box`] and Binder will
     /// manage its lifetime.
+    #[cfg(not(android_ndk))]
     pub fn new_with_stability(rust_object: T, stability: Stability) -> Binder<T> {
+        let mut binder = Self::new_unmarked(rust_object);
+        binder.mark_stability(stability);
+        binder
+    }
+
+    /// Creates a new Binder remotable object with unset stability
+    ///
+    /// This is internal because normally we want to set the stability explicitly,
+    /// however for the NDK variant we cannot mark the stability.
+    fn new_unmarked(rust_object: T) -> Binder<T> {
         let class = T::get_class();
         let rust_object = Box::into_raw(Box::new(rust_object));
         // Safety: `AIBinder_new` expects a valid class pointer (which we
@@ -93,9 +111,7 @@
         // decremented via `AIBinder_decStrong` when the reference lifetime
         // ends.
         let ibinder = unsafe { sys::AIBinder_new(class.into(), rust_object as *mut c_void) };
-        let mut binder = Binder { ibinder, rust_object };
-        binder.mark_stability(stability);
-        binder
+        Binder { ibinder, rust_object }
     }
 
     /// Set the extension of a binder interface. This allows a downstream
@@ -189,6 +205,7 @@
     }
 
     /// Mark this binder object with the given stability guarantee
+    #[cfg(not(android_ndk))]
     fn mark_stability(&mut self, stability: Stability) {
         match stability {
             Stability::Local => self.mark_local_stability(),
@@ -215,7 +232,7 @@
 
     /// Mark this binder object with local stability, which is vendor if we are
     /// building for android_vendor and system otherwise.
-    #[cfg(not(android_vendor))]
+    #[cfg(not(any(android_vendor, android_ndk)))]
     fn mark_local_stability(&mut self) {
         // Safety: Self always contains a valid `AIBinder` pointer, so we can
         // always call this C API safely.
diff --git a/libs/binder/rust/src/parcel.rs b/libs/binder/rust/src/parcel.rs
index 3bfc425..485b0bd 100644
--- a/libs/binder/rust/src/parcel.rs
+++ b/libs/binder/rust/src/parcel.rs
@@ -197,6 +197,7 @@
 // Data serialization methods
 impl<'a> BorrowedParcel<'a> {
     /// Data written to parcelable is zero'd before being deleted or reallocated.
+    #[cfg(not(android_ndk))]
     pub fn mark_sensitive(&mut self) {
         // Safety: guaranteed to have a parcel object, and this method never fails
         unsafe { sys::AParcel_markSensitive(self.as_native()) }
@@ -342,6 +343,7 @@
 
 impl Parcel {
     /// Data written to parcelable is zero'd before being deleted or reallocated.
+    #[cfg(not(android_ndk))]
     pub fn mark_sensitive(&mut self) {
         self.borrowed().mark_sensitive()
     }
diff --git a/libs/binder/rust/src/proxy.rs b/libs/binder/rust/src/proxy.rs
index 04f1517..593d12c 100644
--- a/libs/binder/rust/src/proxy.rs
+++ b/libs/binder/rust/src/proxy.rs
@@ -298,7 +298,7 @@
         unsafe { sys::AIBinder_isAlive(self.as_native()) }
     }
 
-    #[cfg(not(android_vndk))]
+    #[cfg(not(any(android_vndk, android_ndk)))]
     fn set_requesting_sid(&mut self, enable: bool) {
         // Safety: `SpIBinder` guarantees that `self` always contains a valid
         // pointer to an `AIBinder`.
diff --git a/libs/binder/rust/src/service.rs b/libs/binder/rust/src/service.rs
index 29dd8e1..f4fdcf5 100644
--- a/libs/binder/rust/src/service.rs
+++ b/libs/binder/rust/src/service.rs
@@ -176,6 +176,7 @@
 /// seconds if it doesn't yet exist.
 #[deprecated = "this polls 5s, use wait_for_interface or check_interface"]
 pub fn get_interface<T: FromIBinder + ?Sized>(name: &str) -> Result<Strong<T>> {
+    #[allow(deprecated)]
     interface_cast(get_service(name))
 }
 
diff --git a/libs/binder/rust/sys/BinderBindings.hpp b/libs/binder/rust/sys/BinderBindings.hpp
index bd666fe..557f0e8 100644
--- a/libs/binder/rust/sys/BinderBindings.hpp
+++ b/libs/binder/rust/sys/BinderBindings.hpp
@@ -15,15 +15,19 @@
  */
 
 #include <android/binder_ibinder.h>
+#include <android/binder_parcel.h>
+#include <android/binder_status.h>
+
+/* Platform only */
+#if defined(ANDROID_PLATFORM) || defined(__ANDROID_VENDOR__)
 #include <android/binder_ibinder_platform.h>
 #include <android/binder_manager.h>
-#include <android/binder_parcel.h>
 #include <android/binder_parcel_platform.h>
 #include <android/binder_process.h>
 #include <android/binder_rpc.h>
 #include <android/binder_shell.h>
 #include <android/binder_stability.h>
-#include <android/binder_status.h>
+#endif
 
 namespace android {
 
@@ -81,8 +85,10 @@
 
 enum {
     FLAG_ONEWAY = FLAG_ONEWAY,
+#if defined(ANDROID_PLATFORM) || defined(__ANDROID_VENDOR__)
     FLAG_CLEAR_BUF = FLAG_CLEAR_BUF,
     FLAG_PRIVATE_LOCAL = FLAG_PRIVATE_LOCAL,
+#endif
 };
 
 } // namespace consts
diff --git a/libs/binder/rust/sys/Cargo.toml b/libs/binder/rust/sys/Cargo.toml
new file mode 100644
index 0000000..ad8e9c2
--- /dev/null
+++ b/libs/binder/rust/sys/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "android-binder-ndk-sys"
+version = "0.1.0"
+edition = "2021"
+description = "Bindgen bindings to android binder, restricted to the NDK"
+license = "Apache-2.0"
+
+[dependencies]
+
+[lib]
+path = "lib.rs"
+
+[build-dependencies]
+bindgen = "0.70.1"
diff --git a/libs/binder/rust/sys/build.rs b/libs/binder/rust/sys/build.rs
new file mode 100644
index 0000000..cb9c65b
--- /dev/null
+++ b/libs/binder/rust/sys/build.rs
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2024 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.
+ */
+
+use std::env;
+use std::path::PathBuf;
+
+fn main() {
+    let ndk_home = PathBuf::from(env::var("ANDROID_NDK_HOME").unwrap());
+    let toolchain = ndk_home.join("toolchains/llvm/prebuilt/linux-x86_64/");
+    let sysroot = toolchain.join("sysroot");
+    let bindings = bindgen::Builder::default()
+        .clang_arg(format!("--sysroot={}", sysroot.display()))
+        // TODO figure out what the "standard" #define is and use that instead
+        .header("BinderBindings.hpp")
+        .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
+        // Keep in sync with libbinder_ndk_bindgen_flags.txt
+        .default_enum_style(bindgen::EnumVariation::Rust { non_exhaustive: true })
+        .constified_enum("android::c_interface::consts::.*")
+        .allowlist_type("android::c_interface::.*")
+        .allowlist_type("AStatus")
+        .allowlist_type("AIBinder_Class")
+        .allowlist_type("AIBinder")
+        .allowlist_type("AIBinder_Weak")
+        .allowlist_type("AIBinder_DeathRecipient")
+        .allowlist_type("AParcel")
+        .allowlist_type("binder_status_t")
+        .blocklist_function("vprintf")
+        .blocklist_function("strtold")
+        .blocklist_function("_vtlog")
+        .blocklist_function("vscanf")
+        .blocklist_function("vfprintf_worker")
+        .blocklist_function("vsprintf")
+        .blocklist_function("vsnprintf")
+        .blocklist_function("vsnprintf_filtered")
+        .blocklist_function("vfscanf")
+        .blocklist_function("vsscanf")
+        .blocklist_function("vdprintf")
+        .blocklist_function("vasprintf")
+        .blocklist_function("strtold_l")
+        .allowlist_function(".*")
+        .generate()
+        .expect("Couldn't generate bindings");
+    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
+    bindings.write_to_file(out_path.join("bindings.rs")).expect("Couldn't write bindings.");
+    println!("cargo::rustc-link-lib=binder_ndk");
+}
diff --git a/libs/binder/rust/sys/lib.rs b/libs/binder/rust/sys/lib.rs
index 5352473..349e5a9 100644
--- a/libs/binder/rust/sys/lib.rs
+++ b/libs/binder/rust/sys/lib.rs
@@ -20,6 +20,7 @@
 use std::fmt;
 
 #[cfg(not(target_os = "trusty"))]
+#[allow(bad_style)]
 mod bindings {
     include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
 }
diff --git a/libs/gui/BLASTBufferQueue.cpp b/libs/gui/BLASTBufferQueue.cpp
index 49f4cba..fdc39ed 100644
--- a/libs/gui/BLASTBufferQueue.cpp
+++ b/libs/gui/BLASTBufferQueue.cpp
@@ -52,19 +52,18 @@
 namespace {
 
 #if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(BUFFER_RELEASE_CHANNEL)
-// RAII wrapper to defer arbitrary work until the Deferred instance is deleted.
-template <class F>
-class Deferred {
+template <class Mutex>
+class UnlockGuard {
 public:
-    explicit Deferred(F f) : mF{std::move(f)} {}
+    explicit UnlockGuard(Mutex& lock) : mLock{lock} { mLock.unlock(); }
 
-    ~Deferred() { mF(); }
+    ~UnlockGuard() { mLock.lock(); }
 
-    Deferred(const Deferred&) = delete;
-    Deferred& operator=(const Deferred&) = delete;
+    UnlockGuard(const UnlockGuard&) = delete;
+    UnlockGuard& operator=(const UnlockGuard&) = delete;
 
 private:
-    F mF;
+    Mutex& mLock;
 };
 #endif
 
@@ -271,9 +270,6 @@
 void BLASTBufferQueue::onFirstRef() {
     // safe default, most producers are expected to override this
     mProducer->setMaxDequeuedBufferCount(2);
-#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(BUFFER_RELEASE_CHANNEL)
-    mBufferReleaseThread.emplace(sp<BLASTBufferQueue>::fromExisting(this));
-#endif
 }
 
 void BLASTBufferQueue::update(const sp<SurfaceControl>& surface, uint32_t width, uint32_t height,
@@ -297,11 +293,16 @@
     mSurfaceControl = surface;
     SurfaceComposerClient::Transaction t;
     if (surfaceControlChanged) {
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(BUFFER_RELEASE_CHANNEL)
+        // SELinux policy may prevent this process from sending the BufferReleaseChannel's file
+        // descriptor to SurfaceFlinger, causing the entire transaction to be dropped. This
+        // transaction is applied separately to ensure we don't lose the other updates.
+        t.setApplyToken(mApplyToken)
+                .setBufferReleaseChannel(mSurfaceControl, mBufferReleaseProducer)
+                .apply(false /* synchronous */, true /* oneWay */);
+#endif
         t.setFlags(mSurfaceControl, layer_state_t::eEnableBackpressure,
                    layer_state_t::eEnableBackpressure);
-#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(BUFFER_RELEASE_CHANNEL)
-        t.setBufferReleaseChannel(mSurfaceControl, mBufferReleaseProducer);
-#endif
         applyTransaction = true;
     }
     mTransformHint = mSurfaceControl->getTransformHint();
@@ -325,7 +326,7 @@
     }
     if (applyTransaction) {
         // All transactions on our apply token are one-way. See comment on mAppliedLastTransaction
-        t.setApplyToken(mApplyToken).apply(false, true);
+        t.setApplyToken(mApplyToken).apply(false /* synchronous */, true /* oneWay */);
     }
 }
 
@@ -419,7 +420,6 @@
                                                     stat.latchTime,
                                                     stat.frameEventStats.dequeueReadyTime);
                 }
-#if !COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(BUFFER_RELEASE_CHANNEL)
                 auto currFrameNumber = stat.frameEventStats.frameNumber;
                 std::vector<ReleaseCallbackId> staleReleases;
                 for (const auto& [key, value]: mSubmitted) {
@@ -435,7 +435,6 @@
                                                 stat.currentMaxAcquiredBufferCount,
                                                 true /* fakeRelease */);
                 }
-#endif
             } else {
                 BQA_LOGE("Failed to find matching SurfaceControl in transactionCallback");
             }
@@ -469,6 +468,9 @@
             return;
         }
         bbq->releaseBufferCallback(id, releaseFence, currentMaxAcquiredBufferCount);
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(BUFFER_RELEASE_CHANNEL)
+        bbq->drainBufferReleaseConsumer();
+#endif
     };
 }
 
@@ -535,8 +537,6 @@
                                      const sp<Fence>& releaseFence) {
     auto it = mSubmitted.find(callbackId);
     if (it == mSubmitted.end()) {
-        BQA_LOGE("ERROR: releaseBufferCallback without corresponding submitted buffer %s",
-                 callbackId.to_string().c_str());
         return;
     }
     mNumAcquired--;
@@ -646,12 +646,7 @@
                            bufferItem.mGraphicBuffer->getHeight(), bufferItem.mTransform,
                            bufferItem.mScalingMode, crop);
 
-#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(BUFFER_RELEASE_CHANNEL)
-    ReleaseBufferCallback releaseBufferCallback =
-            applyTransaction ? nullptr : makeReleaseBufferCallbackThunk();
-#else
     auto releaseBufferCallback = makeReleaseBufferCallbackThunk();
-#endif
     sp<Fence> fence = bufferItem.mFence ? new Fence(bufferItem.mFence->dup()) : Fence::NO_FENCE;
 
     nsecs_t dequeueTime = -1;
@@ -1230,12 +1225,7 @@
         // we want to ignore it. This must be done before unlocking the BufferQueue lock to ensure
         // we don't miss an interrupt.
         bbq->mBufferReleaseReader->clearInterrupts();
-        bbq->mThreadsBlockingOnDequeue++;
-        bufferQueueLock.unlock();
-        Deferred cleanup{[&]() {
-            bufferQueueLock.lock();
-            bbq->mThreadsBlockingOnDequeue--;
-        }};
+        UnlockGuard unlockGuard{bufferQueueLock};
 
         ATRACE_FORMAT("waiting for free buffer");
         ReleaseCallbackId id;
@@ -1345,6 +1335,21 @@
 
 #if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(BUFFER_RELEASE_CHANNEL)
 
+void BLASTBufferQueue::drainBufferReleaseConsumer() {
+    ATRACE_CALL();
+    while (true) {
+        ReleaseCallbackId id;
+        sp<Fence> fence;
+        uint32_t maxAcquiredBufferCount;
+        status_t status =
+                mBufferReleaseConsumer->readReleaseFence(id, fence, maxAcquiredBufferCount);
+        if (status != OK) {
+            return;
+        }
+        releaseBufferCallback(id, fence, maxAcquiredBufferCount);
+    }
+}
+
 BLASTBufferQueue::BufferReleaseReader::BufferReleaseReader(BLASTBufferQueue& bbq) : mBbq{bbq} {
     mEpollFd = android::base::unique_fd{epoll_create1(EPOLL_CLOEXEC)};
     LOG_ALWAYS_FATAL_IF(!mEpollFd.ok(),
@@ -1438,95 +1443,6 @@
     }
 }
 
-BLASTBufferQueue::BufferReleaseThread::BufferReleaseThread(const sp<BLASTBufferQueue>& bbq) {
-    android::base::unique_fd epollFd{epoll_create1(EPOLL_CLOEXEC)};
-    LOG_ALWAYS_FATAL_IF(!epollFd.ok(),
-                        "Failed to create buffer release background thread epoll file descriptor. "
-                        "errno=%d message='%s'",
-                        errno, strerror(errno));
-
-    epoll_event registerEndpointFd{};
-    registerEndpointFd.events = EPOLLIN;
-    registerEndpointFd.data.fd = bbq->mBufferReleaseConsumer->getFd();
-    status_t status = epoll_ctl(epollFd.get(), EPOLL_CTL_ADD, bbq->mBufferReleaseConsumer->getFd(),
-                                &registerEndpointFd);
-    LOG_ALWAYS_FATAL_IF(status == -1,
-                        "Failed to register background thread buffer release consumer file "
-                        "descriptor with epoll. errno=%d message='%s'",
-                        errno, strerror(errno));
-
-    // EventFd is used to break the background thread's loop.
-    android::base::unique_fd eventFd{eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK)};
-    LOG_ALWAYS_FATAL_IF(!eventFd.ok(),
-                        "Failed to create background thread buffer release event file descriptor. "
-                        "errno=%d message='%s'",
-                        errno, strerror(errno));
-
-    epoll_event registerEventFd{};
-    registerEventFd.events = EPOLLIN;
-    registerEventFd.data.fd = eventFd.get();
-    status = epoll_ctl(epollFd.get(), EPOLL_CTL_ADD, eventFd.get(), &registerEventFd);
-    LOG_ALWAYS_FATAL_IF(status == -1,
-                        "Failed to register background thread event file descriptor with epoll. "
-                        "errno=%d message='%s'",
-                        errno, strerror(errno));
-
-    mEventFd = eventFd.get();
-
-    std::thread([epollFd = std::move(epollFd), eventFd = std::move(eventFd),
-                 weakBbq = wp<BLASTBufferQueue>(bbq)]() {
-        pthread_setname_np(pthread_self(), "BufferReleaseThread");
-        while (true) {
-            epoll_event event{};
-            int eventCount;
-            do {
-                eventCount = epoll_wait(epollFd.get(), &event, 1 /*maxevents*/, -1 /*timeout*/);
-            } while (eventCount == -1 && errno != EINTR);
-
-            if (eventCount == -1) {
-                ALOGE("epoll_wait error while waiting for buffer release in background thread. "
-                      "errno=%d message='%s'",
-                      errno, strerror(errno));
-                continue;
-            }
-
-            // EventFd is used to join this thread.
-            if (event.data.fd == eventFd.get()) {
-                return;
-            }
-
-            sp<BLASTBufferQueue> bbq = weakBbq.promote();
-            if (!bbq) {
-                return;
-            }
-
-            // If there are threads blocking on dequeue, give those threads priority for handling
-            // the release.
-            if (bbq->mThreadsBlockingOnDequeue > 0) {
-                std::this_thread::sleep_for(0ms);
-                continue;
-            }
-
-            ReleaseCallbackId id;
-            sp<Fence> fence;
-            uint32_t maxAcquiredBufferCount;
-            status_t status = bbq->mBufferReleaseConsumer->readReleaseFence(id, fence,
-                                                                            maxAcquiredBufferCount);
-            if (status != OK) {
-                ALOGE("failed to read from buffer release consumer in background thread. errno=%d "
-                      "message='%s'",
-                      errno, strerror(errno));
-                continue;
-            }
-            bbq->releaseBufferCallback(id, fence, maxAcquiredBufferCount);
-        }
-    }).detach();
-}
-
-BLASTBufferQueue::BufferReleaseThread::~BufferReleaseThread() {
-    eventfd_write(mEventFd, 1);
-}
-
 #endif
 
 } // namespace android
diff --git a/libs/gui/BufferReleaseChannel.cpp b/libs/gui/BufferReleaseChannel.cpp
index e9c6ef3..e9cb013 100644
--- a/libs/gui/BufferReleaseChannel.cpp
+++ b/libs/gui/BufferReleaseChannel.cpp
@@ -35,35 +35,35 @@
 namespace {
 
 template <typename T>
-static void readAligned(const void*& buffer, size_t& size, T& value) {
+void readAligned(const void*& buffer, size_t& size, T& value) {
     size -= FlattenableUtils::align<alignof(T)>(buffer);
     FlattenableUtils::read(buffer, size, value);
 }
 
 template <typename T>
-static void writeAligned(void*& buffer, size_t& size, T value) {
+void writeAligned(void*& buffer, size_t& size, T value) {
     size -= FlattenableUtils::align<alignof(T)>(buffer);
     FlattenableUtils::write(buffer, size, value);
 }
 
 template <typename T>
-static void addAligned(size_t& size, T /* value */) {
+void addAligned(size_t& size, T /* value */) {
     size = FlattenableUtils::align<sizeof(T)>(size);
     size += sizeof(T);
 }
 
 template <typename T>
-static inline constexpr uint32_t low32(const T n) {
+inline constexpr uint32_t low32(const T n) {
     return static_cast<uint32_t>(static_cast<uint64_t>(n));
 }
 
 template <typename T>
-static inline constexpr uint32_t high32(const T n) {
+inline constexpr uint32_t high32(const T n) {
     return static_cast<uint32_t>(static_cast<uint64_t>(n) >> 32);
 }
 
 template <typename T>
-static inline constexpr T to64(const uint32_t lo, const uint32_t hi) {
+inline constexpr T to64(const uint32_t lo, const uint32_t hi) {
     return static_cast<T>(static_cast<uint64_t>(hi) << 32 | lo);
 }
 
@@ -139,19 +139,18 @@
     std::lock_guard lock{mMutex};
     Message message;
     mFlattenedBuffer.resize(message.getFlattenedSize());
-    std::array<uint8_t, CMSG_SPACE(sizeof(int))> controlMessageBuffer;
+    std::array<uint8_t, CMSG_SPACE(sizeof(int))> controlMessageBuffer{};
 
     iovec iov{
             .iov_base = mFlattenedBuffer.data(),
             .iov_len = mFlattenedBuffer.size(),
     };
 
-    msghdr msg{
-            .msg_iov = &iov,
-            .msg_iovlen = 1,
-            .msg_control = controlMessageBuffer.data(),
-            .msg_controllen = controlMessageBuffer.size(),
-    };
+    msghdr msg{};
+    msg.msg_iov = &iov;
+    msg.msg_iovlen = 1;
+    msg.msg_control = controlMessageBuffer.data();
+    msg.msg_controllen = controlMessageBuffer.size();
 
     ssize_t result;
     do {
@@ -161,7 +160,7 @@
         if (errno == EWOULDBLOCK || errno == EAGAIN) {
             return WOULD_BLOCK;
         }
-        ALOGE("Error reading release fence from socket: error %#x (%s)", errno, strerror(errno));
+        ALOGE("Error reading release fence from socket: error %d (%s)", errno, strerror(errno));
         return UNKNOWN_ERROR;
     }
 
@@ -200,9 +199,9 @@
     return OK;
 }
 
-int BufferReleaseChannel::ProducerEndpoint::writeReleaseFence(const ReleaseCallbackId& callbackId,
-                                                              const sp<Fence>& fence,
-                                                              uint32_t maxAcquiredBufferCount) {
+status_t BufferReleaseChannel::ProducerEndpoint::writeReleaseFence(
+        const ReleaseCallbackId& callbackId, const sp<Fence>& fence,
+        uint32_t maxAcquiredBufferCount) {
     Message message{callbackId, fence ? fence : Fence::NO_FENCE, maxAcquiredBufferCount};
     mFlattenedBuffer.resize(message.getFlattenedSize());
     int flattenedFd;
@@ -213,25 +212,22 @@
         size_t flattenedBufferSize = mFlattenedBuffer.size();
         int* flattenedFdPtr = &flattenedFd;
         size_t flattenedFdCount = 1;
-        if (status_t err = message.flatten(flattenedBufferPtr, flattenedBufferSize, flattenedFdPtr,
-                                           flattenedFdCount);
-            err != OK) {
-            ALOGE("Failed to flatten BufferReleaseChannel message.");
-            return err;
+        if (status_t status = message.flatten(flattenedBufferPtr, flattenedBufferSize,
+                                              flattenedFdPtr, flattenedFdCount);
+            status != OK) {
+            return status;
         }
     }
 
-    iovec iov{
-            .iov_base = mFlattenedBuffer.data(),
-            .iov_len = mFlattenedBuffer.size(),
-    };
+    iovec iov{};
+    iov.iov_base = mFlattenedBuffer.data();
+    iov.iov_len = mFlattenedBuffer.size();
 
-    msghdr msg{
-            .msg_iov = &iov,
-            .msg_iovlen = 1,
-    };
+    msghdr msg{};
+    msg.msg_iov = &iov;
+    msg.msg_iovlen = 1;
 
-    std::array<uint8_t, CMSG_SPACE(sizeof(int))> controlMessageBuffer;
+    std::array<uint8_t, CMSG_SPACE(sizeof(int))> controlMessageBuffer{};
     if (fence && fence->isValid()) {
         msg.msg_control = controlMessageBuffer.data();
         msg.msg_controllen = controlMessageBuffer.size();
@@ -248,7 +244,6 @@
         result = sendmsg(mFd, &msg, 0);
     } while (result == -1 && errno == EINTR);
     if (result == -1) {
-        ALOGD("Error writing release fence to socket: error %#x (%s)", errno, strerror(errno));
         return -errno;
     }
 
@@ -344,13 +339,6 @@
         return -errno;
     }
 
-    // Make the producer write-only
-    if (shutdown(producerFd.get(), SHUT_RD) == -1) {
-        ALOGE("[%s] Failed to shutdown reading on producer socket. errno=%d message='%s'",
-              name.c_str(), errno, strerror(errno));
-        return -errno;
-    }
-
     outConsumer = std::make_unique<ConsumerEndpoint>(name, std::move(consumerFd));
     outProducer = std::make_shared<ProducerEndpoint>(std::move(name), std::move(producerFd));
     return STATUS_OK;
diff --git a/libs/gui/include/gui/BLASTBufferQueue.h b/libs/gui/include/gui/BLASTBufferQueue.h
index 99c64da..4fd44e5 100644
--- a/libs/gui/include/gui/BLASTBufferQueue.h
+++ b/libs/gui/include/gui/BLASTBufferQueue.h
@@ -325,6 +325,8 @@
     std::unique_ptr<gui::BufferReleaseChannel::ConsumerEndpoint> mBufferReleaseConsumer;
     std::shared_ptr<gui::BufferReleaseChannel::ProducerEndpoint> mBufferReleaseProducer;
 
+    void drainBufferReleaseConsumer();
+
     class BufferReleaseReader {
     public:
         explicit BufferReleaseReader(BLASTBufferQueue&);
@@ -353,19 +355,6 @@
     };
 
     std::optional<BufferReleaseReader> mBufferReleaseReader;
-
-    std::atomic<int> mThreadsBlockingOnDequeue = 0;
-
-    class BufferReleaseThread {
-    public:
-        BufferReleaseThread(const sp<BLASTBufferQueue>&);
-        ~BufferReleaseThread();
-
-    private:
-        int mEventFd;
-    };
-
-    std::optional<BufferReleaseThread> mBufferReleaseThread;
 #endif
 };
 
diff --git a/libs/gui/tests/BufferReleaseChannel_test.cpp b/libs/gui/tests/BufferReleaseChannel_test.cpp
index 11d122b..74f69e1 100644
--- a/libs/gui/tests/BufferReleaseChannel_test.cpp
+++ b/libs/gui/tests/BufferReleaseChannel_test.cpp
@@ -29,11 +29,11 @@
 
 // Helper function to check if two file descriptors point to the same file.
 bool is_same_file(int fd1, int fd2) {
-    struct stat stat1;
+    struct stat stat1 {};
     if (fstat(fd1, &stat1) != 0) {
         return false;
     }
-    struct stat stat2;
+    struct stat stat2 {};
     if (fstat(fd2, &stat2) != 0) {
         return false;
     }
@@ -42,7 +42,18 @@
 
 } // namespace
 
-TEST(BufferReleaseChannelTest, MessageFlattenable) {
+class BufferReleaseChannelTest : public testing::Test {
+protected:
+    std::unique_ptr<BufferReleaseChannel::ConsumerEndpoint> mConsumer;
+    std::shared_ptr<BufferReleaseChannel::ProducerEndpoint> mProducer;
+
+    void SetUp() override {
+        ASSERT_EQ(OK,
+                  BufferReleaseChannel::open("BufferReleaseChannelTest"s, mConsumer, mProducer));
+    }
+};
+
+TEST_F(BufferReleaseChannelTest, MessageFlattenable) {
     ReleaseCallbackId releaseCallbackId{1, 2};
     sp<Fence> releaseFence = sp<Fence>::make(memfd_create("fake-fence-fd", 0));
     uint32_t maxAcquiredBufferCount = 5;
@@ -92,31 +103,23 @@
 
 // Verify that the BufferReleaseChannel consume returns WOULD_BLOCK when there's no message
 // available.
-TEST(BufferReleaseChannelTest, ConsumerEndpointIsNonBlocking) {
-    std::unique_ptr<BufferReleaseChannel::ConsumerEndpoint> consumer;
-    std::shared_ptr<BufferReleaseChannel::ProducerEndpoint> producer;
-    ASSERT_EQ(OK, BufferReleaseChannel::open("test-channel"s, consumer, producer));
-
+TEST_F(BufferReleaseChannelTest, ConsumerEndpointIsNonBlocking) {
     ReleaseCallbackId releaseCallbackId;
     sp<Fence> releaseFence;
     uint32_t maxAcquiredBufferCount;
     ASSERT_EQ(WOULD_BLOCK,
-              consumer->readReleaseFence(releaseCallbackId, releaseFence, maxAcquiredBufferCount));
+              mConsumer->readReleaseFence(releaseCallbackId, releaseFence, maxAcquiredBufferCount));
 }
 
 // Verify that we can write a message to the BufferReleaseChannel producer and read that message
 // using the BufferReleaseChannel consumer.
-TEST(BufferReleaseChannelTest, ProduceAndConsume) {
-    std::unique_ptr<BufferReleaseChannel::ConsumerEndpoint> consumer;
-    std::shared_ptr<BufferReleaseChannel::ProducerEndpoint> producer;
-    ASSERT_EQ(OK, BufferReleaseChannel::open("test-channel"s, consumer, producer));
-
+TEST_F(BufferReleaseChannelTest, ProduceAndConsume) {
     sp<Fence> fence = sp<Fence>::make(memfd_create("fake-fence-fd", 0));
 
     for (uint64_t i = 0; i < 64; i++) {
         ReleaseCallbackId producerId{i, i + 1};
         uint32_t maxAcquiredBufferCount = i + 2;
-        ASSERT_EQ(OK, producer->writeReleaseFence(producerId, fence, maxAcquiredBufferCount));
+        ASSERT_EQ(OK, mProducer->writeReleaseFence(producerId, fence, maxAcquiredBufferCount));
     }
 
     for (uint64_t i = 0; i < 64; i++) {
@@ -127,7 +130,7 @@
         sp<Fence> consumerFence;
         uint32_t maxAcquiredBufferCount;
         ASSERT_EQ(OK,
-                  consumer->readReleaseFence(consumerId, consumerFence, maxAcquiredBufferCount));
+                  mConsumer->readReleaseFence(consumerId, consumerFence, maxAcquiredBufferCount));
 
         ASSERT_EQ(expectedId, consumerId);
         ASSERT_TRUE(is_same_file(fence->get(), consumerFence->get()));
@@ -135,4 +138,16 @@
     }
 }
 
+// Verify that BufferReleaseChannel::ConsumerEndpoint's socket can't be written to.
+TEST_F(BufferReleaseChannelTest, ConsumerSocketReadOnly) {
+    uint64_t data = 0;
+    ASSERT_EQ(-1, write(mConsumer->getFd().get(), &data, sizeof(uint64_t)));
+    ASSERT_EQ(errno, EPIPE);
+}
+
+// Verify that BufferReleaseChannel::ProducerEndpoint's socket can't be read from.
+TEST_F(BufferReleaseChannelTest, ProducerSocketWriteOnly) {
+    ASSERT_EQ(0, read(mProducer->getFd().get(), nullptr, sizeof(uint64_t)));
+}
+
 } // namespace android
\ No newline at end of file
diff --git a/libs/gui/tests/EndToEndNativeInputTest.cpp b/libs/gui/tests/EndToEndNativeInputTest.cpp
index 7d0b512..a481d12 100644
--- a/libs/gui/tests/EndToEndNativeInputTest.cpp
+++ b/libs/gui/tests/EndToEndNativeInputTest.cpp
@@ -294,7 +294,7 @@
                     transactionBody) {
         SurfaceComposerClient::Transaction t;
         transactionBody(t, mSurfaceControl);
-        t.apply(true);
+        t.apply(/*synchronously=*/true);
     }
 
     virtual void showAt(int x, int y, Rect crop = Rect(0, 0, 100, 100)) {
@@ -307,7 +307,7 @@
         t.setAlpha(mSurfaceControl, 1);
         auto reportedListener = sp<SynchronousWindowInfosReportedListener>::make();
         t.addWindowInfosReportedListener(reportedListener);
-        t.apply();
+        t.apply(/*synchronously=*/true);
         reportedListener->wait();
     }
 
@@ -319,7 +319,7 @@
         request.timestamp = systemTime(SYSTEM_TIME_MONOTONIC);
         request.displayId = displayId.val();
         t.setFocusedWindow(request);
-        t.apply(true);
+        t.apply(/*synchronously=*/true);
     }
 
 public:
@@ -363,7 +363,7 @@
                     transactionBody) override {
         SurfaceComposerClient::Transaction t;
         transactionBody(t, mParentSurfaceControl);
-        t.apply(true);
+        t.apply(/*synchronously=*/true);
     }
 
     void showAt(int x, int y, Rect crop = Rect(0, 0, 100, 100)) override {
@@ -377,7 +377,7 @@
         t.setInputWindowInfo(mSurfaceControl, mInputInfo);
         t.setCrop(mSurfaceControl, crop);
         t.setAlpha(mSurfaceControl, 1);
-        t.apply(true);
+        t.apply(/*synchronously=*/true);
     }
 
 private:
@@ -417,7 +417,7 @@
                 BufferUsage::COMPOSER_OVERLAY | BufferUsage::GPU_TEXTURE;
         sp<GraphicBuffer> buffer =
                 new GraphicBuffer(w, h, PIXEL_FORMAT_RGBA_8888, 1, usageFlags, "test");
-        Transaction().setBuffer(layer, buffer).apply(true);
+        Transaction().setBuffer(layer, buffer).apply(/*synchronously=*/true);
         usleep(mBufferPostDelay);
     }
 
@@ -1207,7 +1207,7 @@
         t.setDisplayLayerStack(token, layerStack);
         t.setDisplayProjection(token, ui::ROTATION_0, {0, 0, width, height},
                                {offsetX, offsetY, offsetX + width, offsetY + height});
-        t.apply(true);
+        t.apply(/*synchronously=*/true);
 
         mVirtualDisplays.push_back(token);
     }
diff --git a/libs/input/input_flags.aconfig b/libs/input/input_flags.aconfig
index 7acfafb..fd77048 100644
--- a/libs/input/input_flags.aconfig
+++ b/libs/input/input_flags.aconfig
@@ -214,3 +214,20 @@
   description: "Set input device's power/wakeup sysfs node"
   bug: "372812925"
 }
+
+flag {
+  name: "enable_alphabetic_keyboard_wake"
+  namespace: "input"
+  description: "Enable wake from alphabetic keyboards."
+  bug: "352856881"
+  metadata {
+    purpose: PURPOSE_BUGFIX
+  }
+}
+
+flag {
+  name: "connected_displays_cursor"
+  namespace: "lse_desktop_experience"
+  description: "Allow cursor to transition across multiple connected displays"
+  bug: "362719483"
+}
diff --git a/libs/nativewindow/ANativeWindow.cpp b/libs/nativewindow/ANativeWindow.cpp
index f97eed5..ac3a832 100644
--- a/libs/nativewindow/ANativeWindow.cpp
+++ b/libs/nativewindow/ANativeWindow.cpp
@@ -263,6 +263,16 @@
     return native_window_set_frame_rate(window, frameRate, compatibility, changeFrameRateStrategy);
 }
 
+int32_t ANativeWindow_setFrameRateParams(
+        ANativeWindow* window, float desiredMinRate, float desiredMaxRate, float fixedSourceRate,
+        ANativeWindow_ChangeFrameRateStrategy changeFrameRateStrategy) {
+    if (!window || !query(window, NATIVE_WINDOW_IS_VALID)) {
+        return -EINVAL;
+    }
+    return native_window_set_frame_rate_params(window, desiredMinRate, desiredMaxRate,
+                                               fixedSourceRate, changeFrameRateStrategy);
+}
+
 /**************************************************************************************************
  * vndk-stable
  **************************************************************************************************/
diff --git a/libs/nativewindow/include/android/native_window.h b/libs/nativewindow/include/android/native_window.h
index be6623e..bd8d67a 100644
--- a/libs/nativewindow/include/android/native_window.h
+++ b/libs/nativewindow/include/android/native_window.h
@@ -33,8 +33,8 @@
 #ifndef ANDROID_NATIVE_WINDOW_H
 #define ANDROID_NATIVE_WINDOW_H
 
-#include <stdint.h>
 #include <stdbool.h>
+#include <stdint.h>
 #include <sys/cdefs.h>
 
 #include <android/data_space.h>
@@ -282,7 +282,7 @@
 void ANativeWindow_tryAllocateBuffers(ANativeWindow* window) __INTRODUCED_IN(30);
 
 /** Change frame rate strategy value for ANativeWindow_setFrameRate. */
-enum ANativeWindow_ChangeFrameRateStrategy {
+typedef enum ANativeWindow_ChangeFrameRateStrategy : int8_t {
     /**
      * Change the frame rate only if the transition is going to be seamless.
      */
@@ -292,7 +292,7 @@
      * i.e. with visual interruptions for the user.
      */
     ANATIVEWINDOW_CHANGE_FRAME_RATE_ALWAYS = 1
-} __INTRODUCED_IN(31);
+} ANativeWindow_ChangeFrameRateStrategy __INTRODUCED_IN(31);
 
 /**
  * Sets the intended frame rate for this window.
@@ -345,6 +345,76 @@
         __INTRODUCED_IN(31);
 
 /**
+ * Sets the intended frame rate for this window.
+ *
+ * On devices that are capable of running the display at different frame rates,
+ * the system may choose a display refresh rate to better match this surface's frame
+ * rate. Usage of this API won't introduce frame rate throttling, or affect other
+ * aspects of the application's frame production pipeline. However, because the system
+ * may change the display refresh rate, calls to this function may result in changes
+ * to Choreographer callback timings, and changes to the time interval at which the
+ * system releases buffers back to the application.
+ *
+ * Note that this only has an effect for surfaces presented on the display. If this
+ * surface is consumed by something other than the system compositor, e.g. a media
+ * codec, this call has no effect.
+ *
+ * You can register for changes in the refresh rate using
+ * \a AChoreographer_registerRefreshRateCallback.
+ *
+ * See ANativeWindow_clearFrameRate().
+ *
+ * Available since API level 36.
+ *
+ * \param window pointer to an ANativeWindow object.
+ *
+ * \param desiredMinRate The desired minimum frame rate (inclusive) for the window, specifying that
+ * the surface prefers the device render rate to be at least `desiredMinRate`.
+ *
+ * <p>Set `desiredMinRate` = `desiredMaxRate` to indicate the surface prefers an exact frame rate.
+ *
+ * <p>Set `desiredMinRate` = 0 to indicate the window has no preference
+ * and any frame rate is acceptable.
+ *
+ * <p>The value should be greater than or equal to 0.
+ *
+ * \param desiredMaxRate The desired maximum frame rate (inclusive) for the window, specifying that
+ * the surface prefers the device render rate to be at most `desiredMaxRate`.
+ *
+ * <p>Set `desiredMaxRate` = `desiredMinRate` to indicate the surface prefers an exact frame rate.
+ *
+ * <p>Set `desiredMaxRate` = positive infinity to indicate the window has no preference
+ * and any frame rate is acceptable.
+ *
+ * <p>The value should be greater than or equal to `desiredMinRate`.
+ *
+ * \param fixedSourceRate The "fixed source" frame rate of the window if the content has an
+ * inherently fixed frame rate, e.g. a video that has a specific frame rate.
+ *
+ * <p>When the frame rate chosen for the surface is the `fixedSourceRate` or a
+ * multiple, the surface can render without frame pulldown, for optimal smoothness. For
+ * example, a 30 fps video (`fixedSourceRate`=30) renders just as smoothly on 30 fps,
+ * 60 fps, 90 fps, 120 fps, and so on.
+ *
+ * <p>Setting the fixed source rate can also be used together with a desired
+ * frame rate min and max via setting `desiredMinRate` and `desiredMaxRate`. This still
+ * means the window's content has a fixed frame rate of `fixedSourceRate`, but additionally
+ * specifies the preference to be in the range [`desiredMinRate`, `desiredMaxRate`]. For example, an
+ * app might want to specify there is 30 fps video (`fixedSourceRate`=30) as well as a smooth
+ * animation on the same window which looks good when drawing within a frame rate range such as
+ * [`desiredMinRate`, `desiredMaxRate`] = [60,120].
+ *
+ * \param changeFrameRateStrategy Whether display refresh rate transitions caused by this surface
+ * should be seamless. A seamless transition is one that doesn't have any visual interruptions, such
+ * as a black screen for a second or two.
+ *
+ * \return 0 for success, -EINVAL if the arguments are invalid.
+ */
+int32_t ANativeWindow_setFrameRateParams(
+        ANativeWindow* window, float desiredMinRate, float desiredMaxRate, float fixedSourceRate,
+        ANativeWindow_ChangeFrameRateStrategy changeFrameRateStrategy) __INTRODUCED_IN(36);
+
+/**
  * Clears the frame rate which is set for this window.
  *
  * This is equivalent to calling
@@ -366,14 +436,13 @@
  *
  * See ANativeWindow_setFrameRateWithChangeStrategy().
  *
- * Available since API level 34.
+ * Available since API level 31.
  *
  * \param window pointer to an ANativeWindow object.
  *
  * \return 0 for success, -EINVAL if the window value is invalid.
  */
-inline int32_t ANativeWindow_clearFrameRate(ANativeWindow* window)
-        __INTRODUCED_IN(__ANDROID_API_U__) {
+inline int32_t ANativeWindow_clearFrameRate(ANativeWindow* window) __INTRODUCED_IN(31) {
     return ANativeWindow_setFrameRateWithChangeStrategy(window, 0,
             ANATIVEWINDOW_FRAME_RATE_COMPATIBILITY_DEFAULT,
             ANATIVEWINDOW_CHANGE_FRAME_RATE_ONLY_IF_SEAMLESS);
diff --git a/libs/nativewindow/include/system/window.h b/libs/nativewindow/include/system/window.h
index 33c303a..05f49ad 100644
--- a/libs/nativewindow/include/system/window.h
+++ b/libs/nativewindow/include/system/window.h
@@ -1156,6 +1156,23 @@
                            (int)compatibility, (int)changeFrameRateStrategy);
 }
 
+static inline int native_window_set_frame_rate_params(struct ANativeWindow* window,
+                                                      float desiredMinRate, float desiredMaxRate,
+                                                      float fixedSourceRate,
+                                                      int8_t changeFrameRateStrategy) {
+    // TODO(b/362798998): Fix plumbing to send whole params
+    int compatibility = fixedSourceRate == 0 ? ANATIVEWINDOW_FRAME_RATE_COMPATIBILITY_DEFAULT
+                                             : ANATIVEWINDOW_FRAME_RATE_COMPATIBILITY_FIXED_SOURCE;
+    double frameRate = compatibility == ANATIVEWINDOW_FRAME_RATE_COMPATIBILITY_FIXED_SOURCE
+            ? fixedSourceRate
+            : desiredMinRate;
+    if (desiredMaxRate < desiredMinRate) {
+        return -EINVAL;
+    }
+    return window->perform(window, NATIVE_WINDOW_SET_FRAME_RATE, frameRate, compatibility,
+                           changeFrameRateStrategy);
+}
+
 struct ANativeWindowFrameTimelineInfo {
     // Frame Id received from ANativeWindow_getNextFrameId.
     uint64_t frameNumber;
diff --git a/libs/nativewindow/libnativewindow.map.txt b/libs/nativewindow/libnativewindow.map.txt
index e29d5a6..071e354 100644
--- a/libs/nativewindow/libnativewindow.map.txt
+++ b/libs/nativewindow/libnativewindow.map.txt
@@ -53,6 +53,7 @@
     ANativeWindow_setBuffersTransform;
     ANativeWindow_setDequeueTimeout; # systemapi introduced=30
     ANativeWindow_setFrameRate; # introduced=30
+    ANativeWindow_setFrameRateParams; # introduced=36
     ANativeWindow_setFrameRateWithChangeStrategy; # introduced=31
     ANativeWindow_setSharedBufferMode; # llndk
     ANativeWindow_setSwapInterval; # llndk
diff --git a/libs/nativewindow/rust/src/lib.rs b/libs/nativewindow/rust/src/lib.rs
index a1d986e..014c912 100644
--- a/libs/nativewindow/rust/src/lib.rs
+++ b/libs/nativewindow/rust/src/lib.rs
@@ -203,8 +203,8 @@
         Self(buffer_ptr)
     }
 
-    /// Creates a new Rust HardwareBuffer to wrap the given AHardwareBuffer without taking ownership
-    /// of it.
+    /// Creates a new Rust HardwareBuffer to wrap the given `AHardwareBuffer` without taking
+    /// ownership of it.
     ///
     /// Unlike [`from_raw`](Self::from_raw) this method will increment the refcount on the buffer.
     /// This means that the caller can continue to use the raw buffer it passed in, and must call
@@ -220,14 +220,20 @@
         Self(buffer)
     }
 
-    /// Get the internal `AHardwareBuffer` pointer that is only valid when this `HardwareBuffer`
-    /// exists. This can be used to provide a pointer to the AHB for a C/C++ API over the FFI.
+    /// Returns the internal `AHardwareBuffer` pointer.
+    ///
+    /// This is only valid as long as this `HardwareBuffer` exists, so shouldn't be stored. It can
+    /// be used to provide a pointer for a C/C++ API over FFI.
     pub fn as_raw(&self) -> NonNull<AHardwareBuffer> {
         self.0
     }
 
-    /// Get the internal `AHardwareBuffer` pointer without decrementing the refcount. This can
-    /// be used to provide a pointer to the AHB for a C/C++ API over the FFI.
+    /// Gets the internal `AHardwareBuffer` pointer without decrementing the refcount. This can
+    /// be used for a C/C++ API which takes ownership of the pointer.
+    ///
+    /// The caller is responsible for releasing the `AHardwareBuffer` pointer by calling
+    /// `AHardwareBuffer_release` when it is finished with it, or may convert it back to a Rust
+    /// `HardwareBuffer` by calling [`HardwareBuffer::from_raw`].
     pub fn into_raw(self) -> NonNull<AHardwareBuffer> {
         let buffer = ManuallyDrop::new(self);
         buffer.0
diff --git a/services/inputflinger/reader/mapper/KeyboardInputMapper.cpp b/services/inputflinger/reader/mapper/KeyboardInputMapper.cpp
index a433a72..fe3e4c2 100644
--- a/services/inputflinger/reader/mapper/KeyboardInputMapper.cpp
+++ b/services/inputflinger/reader/mapper/KeyboardInputMapper.cpp
@@ -344,12 +344,14 @@
     }
 
     KeyboardType keyboardType = getDeviceContext().getKeyboardType();
-    // Any key down on an external keyboard should wake the device.
-    // We don't do this for internal keyboards to prevent them from waking up in your pocket.
+    // Any key down on an external keyboard or internal alphanumeric keyboard should wake the
+    // device. We don't do this for non-alphanumeric internal keyboards to prevent them from
+    // waking up in your pocket.
     // For internal keyboards and devices for which the default wake behavior is explicitly
     // prevented (e.g. TV remotes), the key layout file should specify the policy flags for each
     // wake key individually.
-    if (down && getDeviceContext().isExternal() && !mParameters.doNotWakeByDefault &&
+    if (down && !mParameters.doNotWakeByDefault &&
+        (getDeviceContext().isExternal() || wakeOnAlphabeticKeyboard(keyboardType)) &&
         !(keyboardType != KeyboardType::ALPHABETIC && isMediaKey(keyCode))) {
         policyFlags |= POLICY_FLAG_WAKE;
     }
@@ -507,4 +509,8 @@
     return deviceSources & ALL_KEYBOARD_SOURCES;
 }
 
+bool KeyboardInputMapper::wakeOnAlphabeticKeyboard(const KeyboardType keyboardType) const {
+    return mEnableAlphabeticKeyboardWakeFlag && (KeyboardType::ALPHABETIC == keyboardType);
+}
+
 } // namespace android
diff --git a/services/inputflinger/reader/mapper/KeyboardInputMapper.h b/services/inputflinger/reader/mapper/KeyboardInputMapper.h
index 10bd424..7d9b3e4 100644
--- a/services/inputflinger/reader/mapper/KeyboardInputMapper.h
+++ b/services/inputflinger/reader/mapper/KeyboardInputMapper.h
@@ -16,6 +16,8 @@
 
 #pragma once
 
+#include <com_android_input_flags.h>
+
 #include "HidUsageAccumulator.h"
 #include "InputMapper.h"
 
@@ -85,6 +87,10 @@
         bool doNotWakeByDefault{};
     } mParameters{};
 
+    // Store the value of enable wake for alphanumeric keyboard flag.
+    const bool mEnableAlphabeticKeyboardWakeFlag =
+            com::android::input::flags::enable_alphabetic_keyboard_wake();
+
     KeyboardInputMapper(InputDeviceContext& deviceContext,
                         const InputReaderConfiguration& readerConfig, uint32_t source);
     void configureParameters();
@@ -109,6 +115,8 @@
     [[nodiscard]] std::list<NotifyArgs> cancelAllDownKeys(nsecs_t when);
     void onKeyDownProcessed(nsecs_t downTime);
     uint32_t getEventSource() const;
+
+    bool wakeOnAlphabeticKeyboard(const KeyboardType keyboardType) const;
 };
 
 } // namespace android
diff --git a/services/inputflinger/tests/Android.bp b/services/inputflinger/tests/Android.bp
index 744cf4a..600ae52 100644
--- a/services/inputflinger/tests/Android.bp
+++ b/services/inputflinger/tests/Android.bp
@@ -78,6 +78,7 @@
         "PreferStylusOverTouch_test.cpp",
         "PropertyProvider_test.cpp",
         "RotaryEncoderInputMapper_test.cpp",
+        "SensorInputMapper_test.cpp",
         "SlopController_test.cpp",
         "SwitchInputMapper_test.cpp",
         "SyncQueue_test.cpp",
diff --git a/services/inputflinger/tests/InputReader_test.cpp b/services/inputflinger/tests/InputReader_test.cpp
index 19b738e..ee3b2a2 100644
--- a/services/inputflinger/tests/InputReader_test.cpp
+++ b/services/inputflinger/tests/InputReader_test.cpp
@@ -28,7 +28,6 @@
 #include <MultiTouchInputMapper.h>
 #include <NotifyArgsBuilders.h>
 #include <PeripheralController.h>
-#include <SensorInputMapper.h>
 #include <SingleTouchInputMapper.h>
 #include <TestEventMatchers.h>
 #include <TestInputListener.h>
@@ -36,6 +35,7 @@
 #include <UinputDevice.h>
 #include <android-base/thread_annotations.h>
 #include <com_android_input_flags.h>
+#include <flag_macros.h>
 #include <ftl/enum.h>
 #include <gtest/gtest.h>
 #include <ui/Rotation.h>
@@ -3031,159 +3031,6 @@
     mapper.assertProcessWasCalled();
 }
 
-// --- SensorInputMapperTest ---
-
-class SensorInputMapperTest : public InputMapperTest {
-protected:
-    static const int32_t ACCEL_RAW_MIN;
-    static const int32_t ACCEL_RAW_MAX;
-    static const int32_t ACCEL_RAW_FUZZ;
-    static const int32_t ACCEL_RAW_FLAT;
-    static const int32_t ACCEL_RAW_RESOLUTION;
-
-    static const int32_t GYRO_RAW_MIN;
-    static const int32_t GYRO_RAW_MAX;
-    static const int32_t GYRO_RAW_FUZZ;
-    static const int32_t GYRO_RAW_FLAT;
-    static const int32_t GYRO_RAW_RESOLUTION;
-
-    static const float GRAVITY_MS2_UNIT;
-    static const float DEGREE_RADIAN_UNIT;
-
-    void prepareAccelAxes();
-    void prepareGyroAxes();
-    void setAccelProperties();
-    void setGyroProperties();
-    void SetUp() override { InputMapperTest::SetUp(DEVICE_CLASSES | InputDeviceClass::SENSOR); }
-};
-
-const int32_t SensorInputMapperTest::ACCEL_RAW_MIN = -32768;
-const int32_t SensorInputMapperTest::ACCEL_RAW_MAX = 32768;
-const int32_t SensorInputMapperTest::ACCEL_RAW_FUZZ = 16;
-const int32_t SensorInputMapperTest::ACCEL_RAW_FLAT = 0;
-const int32_t SensorInputMapperTest::ACCEL_RAW_RESOLUTION = 8192;
-
-const int32_t SensorInputMapperTest::GYRO_RAW_MIN = -2097152;
-const int32_t SensorInputMapperTest::GYRO_RAW_MAX = 2097152;
-const int32_t SensorInputMapperTest::GYRO_RAW_FUZZ = 16;
-const int32_t SensorInputMapperTest::GYRO_RAW_FLAT = 0;
-const int32_t SensorInputMapperTest::GYRO_RAW_RESOLUTION = 1024;
-
-const float SensorInputMapperTest::GRAVITY_MS2_UNIT = 9.80665f;
-const float SensorInputMapperTest::DEGREE_RADIAN_UNIT = 0.0174533f;
-
-void SensorInputMapperTest::prepareAccelAxes() {
-    mFakeEventHub->addAbsoluteAxis(EVENTHUB_ID, ABS_X, ACCEL_RAW_MIN, ACCEL_RAW_MAX, ACCEL_RAW_FUZZ,
-                                   ACCEL_RAW_FLAT, ACCEL_RAW_RESOLUTION);
-    mFakeEventHub->addAbsoluteAxis(EVENTHUB_ID, ABS_Y, ACCEL_RAW_MIN, ACCEL_RAW_MAX, ACCEL_RAW_FUZZ,
-                                   ACCEL_RAW_FLAT, ACCEL_RAW_RESOLUTION);
-    mFakeEventHub->addAbsoluteAxis(EVENTHUB_ID, ABS_Z, ACCEL_RAW_MIN, ACCEL_RAW_MAX, ACCEL_RAW_FUZZ,
-                                   ACCEL_RAW_FLAT, ACCEL_RAW_RESOLUTION);
-}
-
-void SensorInputMapperTest::prepareGyroAxes() {
-    mFakeEventHub->addAbsoluteAxis(EVENTHUB_ID, ABS_RX, GYRO_RAW_MIN, GYRO_RAW_MAX, GYRO_RAW_FUZZ,
-                                   GYRO_RAW_FLAT, GYRO_RAW_RESOLUTION);
-    mFakeEventHub->addAbsoluteAxis(EVENTHUB_ID, ABS_RY, GYRO_RAW_MIN, GYRO_RAW_MAX, GYRO_RAW_FUZZ,
-                                   GYRO_RAW_FLAT, GYRO_RAW_RESOLUTION);
-    mFakeEventHub->addAbsoluteAxis(EVENTHUB_ID, ABS_RZ, GYRO_RAW_MIN, GYRO_RAW_MAX, GYRO_RAW_FUZZ,
-                                   GYRO_RAW_FLAT, GYRO_RAW_RESOLUTION);
-}
-
-void SensorInputMapperTest::setAccelProperties() {
-    mFakeEventHub->addSensorAxis(EVENTHUB_ID, /* absCode */ 0, InputDeviceSensorType::ACCELEROMETER,
-                                 /* sensorDataIndex */ 0);
-    mFakeEventHub->addSensorAxis(EVENTHUB_ID, /* absCode */ 1, InputDeviceSensorType::ACCELEROMETER,
-                                 /* sensorDataIndex */ 1);
-    mFakeEventHub->addSensorAxis(EVENTHUB_ID, /* absCode */ 2, InputDeviceSensorType::ACCELEROMETER,
-                                 /* sensorDataIndex */ 2);
-    mFakeEventHub->setMscEvent(EVENTHUB_ID, MSC_TIMESTAMP);
-    addConfigurationProperty("sensor.accelerometer.reportingMode", "0");
-    addConfigurationProperty("sensor.accelerometer.maxDelay", "100000");
-    addConfigurationProperty("sensor.accelerometer.minDelay", "5000");
-    addConfigurationProperty("sensor.accelerometer.power", "1.5");
-}
-
-void SensorInputMapperTest::setGyroProperties() {
-    mFakeEventHub->addSensorAxis(EVENTHUB_ID, /* absCode */ 3, InputDeviceSensorType::GYROSCOPE,
-                                 /* sensorDataIndex */ 0);
-    mFakeEventHub->addSensorAxis(EVENTHUB_ID, /* absCode */ 4, InputDeviceSensorType::GYROSCOPE,
-                                 /* sensorDataIndex */ 1);
-    mFakeEventHub->addSensorAxis(EVENTHUB_ID, /* absCode */ 5, InputDeviceSensorType::GYROSCOPE,
-                                 /* sensorDataIndex */ 2);
-    mFakeEventHub->setMscEvent(EVENTHUB_ID, MSC_TIMESTAMP);
-    addConfigurationProperty("sensor.gyroscope.reportingMode", "0");
-    addConfigurationProperty("sensor.gyroscope.maxDelay", "100000");
-    addConfigurationProperty("sensor.gyroscope.minDelay", "5000");
-    addConfigurationProperty("sensor.gyroscope.power", "0.8");
-}
-
-TEST_F(SensorInputMapperTest, GetSources) {
-    SensorInputMapper& mapper = constructAndAddMapper<SensorInputMapper>();
-
-    ASSERT_EQ(static_cast<uint32_t>(AINPUT_SOURCE_SENSOR), mapper.getSources());
-}
-
-TEST_F(SensorInputMapperTest, ProcessAccelerometerSensor) {
-    setAccelProperties();
-    prepareAccelAxes();
-    SensorInputMapper& mapper = constructAndAddMapper<SensorInputMapper>();
-
-    ASSERT_TRUE(mapper.enableSensor(InputDeviceSensorType::ACCELEROMETER,
-                                    std::chrono::microseconds(10000),
-                                    std::chrono::microseconds(0)));
-    ASSERT_TRUE(mFakeEventHub->isDeviceEnabled(EVENTHUB_ID));
-    process(mapper, ARBITRARY_TIME, READ_TIME, EV_ABS, ABS_X, 20000);
-    process(mapper, ARBITRARY_TIME, READ_TIME, EV_ABS, ABS_Y, -20000);
-    process(mapper, ARBITRARY_TIME, READ_TIME, EV_ABS, ABS_Z, 40000);
-    process(mapper, ARBITRARY_TIME, READ_TIME, EV_MSC, MSC_TIMESTAMP, 1000);
-    process(mapper, ARBITRARY_TIME, READ_TIME, EV_SYN, SYN_REPORT, 0);
-
-    NotifySensorArgs args;
-    std::vector<float> values = {20000.0f / ACCEL_RAW_RESOLUTION * GRAVITY_MS2_UNIT,
-                                 -20000.0f / ACCEL_RAW_RESOLUTION * GRAVITY_MS2_UNIT,
-                                 40000.0f / ACCEL_RAW_RESOLUTION * GRAVITY_MS2_UNIT};
-
-    ASSERT_NO_FATAL_FAILURE(mFakeListener->assertNotifySensorWasCalled(&args));
-    ASSERT_EQ(args.source, AINPUT_SOURCE_SENSOR);
-    ASSERT_EQ(args.deviceId, DEVICE_ID);
-    ASSERT_EQ(args.sensorType, InputDeviceSensorType::ACCELEROMETER);
-    ASSERT_EQ(args.accuracy, InputDeviceSensorAccuracy::ACCURACY_HIGH);
-    ASSERT_EQ(args.hwTimestamp, ARBITRARY_TIME);
-    ASSERT_EQ(args.values, values);
-    mapper.flushSensor(InputDeviceSensorType::ACCELEROMETER);
-}
-
-TEST_F(SensorInputMapperTest, ProcessGyroscopeSensor) {
-    setGyroProperties();
-    prepareGyroAxes();
-    SensorInputMapper& mapper = constructAndAddMapper<SensorInputMapper>();
-
-    ASSERT_TRUE(mapper.enableSensor(InputDeviceSensorType::GYROSCOPE,
-                                    std::chrono::microseconds(10000),
-                                    std::chrono::microseconds(0)));
-    ASSERT_TRUE(mFakeEventHub->isDeviceEnabled(EVENTHUB_ID));
-    process(mapper, ARBITRARY_TIME, READ_TIME, EV_ABS, ABS_RX, 20000);
-    process(mapper, ARBITRARY_TIME, READ_TIME, EV_ABS, ABS_RY, -20000);
-    process(mapper, ARBITRARY_TIME, READ_TIME, EV_ABS, ABS_RZ, 40000);
-    process(mapper, ARBITRARY_TIME, READ_TIME, EV_MSC, MSC_TIMESTAMP, 1000);
-    process(mapper, ARBITRARY_TIME, READ_TIME, EV_SYN, SYN_REPORT, 0);
-
-    NotifySensorArgs args;
-    std::vector<float> values = {20000.0f / GYRO_RAW_RESOLUTION * DEGREE_RADIAN_UNIT,
-                                 -20000.0f / GYRO_RAW_RESOLUTION * DEGREE_RADIAN_UNIT,
-                                 40000.0f / GYRO_RAW_RESOLUTION * DEGREE_RADIAN_UNIT};
-
-    ASSERT_NO_FATAL_FAILURE(mFakeListener->assertNotifySensorWasCalled(&args));
-    ASSERT_EQ(args.source, AINPUT_SOURCE_SENSOR);
-    ASSERT_EQ(args.deviceId, DEVICE_ID);
-    ASSERT_EQ(args.sensorType, InputDeviceSensorType::GYROSCOPE);
-    ASSERT_EQ(args.accuracy, InputDeviceSensorAccuracy::ACCURACY_HIGH);
-    ASSERT_EQ(args.hwTimestamp, ARBITRARY_TIME);
-    ASSERT_EQ(args.values, values);
-    mapper.flushSensor(InputDeviceSensorType::GYROSCOPE);
-}
-
 // --- KeyboardInputMapperTest ---
 
 class KeyboardInputMapperTest : public InputMapperTest {
@@ -4019,6 +3866,44 @@
     ASSERT_EQ(AKEY_EVENT_FLAG_FROM_SYSTEM | AKEY_EVENT_FLAG_KEEP_TOUCH_MODE, args.flags);
 }
 
+TEST_F_WITH_FLAGS(KeyboardInputMapperTest, WakeBehavior_AlphabeticKeyboard,
+                  REQUIRES_FLAGS_ENABLED(ACONFIG_FLAG(com::android::input::flags,
+                                                      enable_alphabetic_keyboard_wake))) {
+    // For internal alphabetic devices, keys will trigger wake on key down.
+
+    mFakeEventHub->addKey(EVENTHUB_ID, KEY_A, 0, AKEYCODE_A, 0);
+    mFakeEventHub->addKey(EVENTHUB_ID, KEY_HOME, 0, AKEYCODE_HOME, 0);
+    mFakeEventHub->addKey(EVENTHUB_ID, KEY_PLAYPAUSE, 0, AKEYCODE_MEDIA_PLAY_PAUSE, 0);
+
+    KeyboardInputMapper& mapper =
+            constructAndAddMapper<KeyboardInputMapper>(AINPUT_SOURCE_KEYBOARD);
+
+    process(mapper, ARBITRARY_TIME, READ_TIME, EV_KEY, KEY_A, 1);
+    NotifyKeyArgs args;
+    ASSERT_NO_FATAL_FAILURE(mFakeListener->assertNotifyKeyWasCalled(&args));
+    ASSERT_EQ(POLICY_FLAG_WAKE, args.policyFlags);
+
+    process(mapper, ARBITRARY_TIME + 1, READ_TIME, EV_KEY, KEY_A, 0);
+    ASSERT_NO_FATAL_FAILURE(mFakeListener->assertNotifyKeyWasCalled(&args));
+    ASSERT_EQ(uint32_t(0), args.policyFlags);
+
+    process(mapper, ARBITRARY_TIME, READ_TIME, EV_KEY, KEY_HOME, 1);
+    ASSERT_NO_FATAL_FAILURE(mFakeListener->assertNotifyKeyWasCalled(&args));
+    ASSERT_EQ(POLICY_FLAG_WAKE, args.policyFlags);
+
+    process(mapper, ARBITRARY_TIME + 1, READ_TIME, EV_KEY, KEY_HOME, 0);
+    ASSERT_NO_FATAL_FAILURE(mFakeListener->assertNotifyKeyWasCalled(&args));
+    ASSERT_EQ(uint32_t(0), args.policyFlags);
+
+    process(mapper, ARBITRARY_TIME, READ_TIME, EV_KEY, KEY_PLAYPAUSE, 1);
+    ASSERT_NO_FATAL_FAILURE(mFakeListener->assertNotifyKeyWasCalled(&args));
+    ASSERT_EQ(POLICY_FLAG_WAKE, args.policyFlags);
+
+    process(mapper, ARBITRARY_TIME + 1, READ_TIME, EV_KEY, KEY_PLAYPAUSE, 0);
+    ASSERT_NO_FATAL_FAILURE(mFakeListener->assertNotifyKeyWasCalled(&args));
+    ASSERT_EQ(uint32_t(0), args.policyFlags);
+}
+
 /**
  * When there is more than one KeyboardInputMapper for an InputDevice, each mapper should produce
  * events that use the shared keyboard source across all mappers. This is to ensure that each
diff --git a/services/inputflinger/tests/SensorInputMapper_test.cpp b/services/inputflinger/tests/SensorInputMapper_test.cpp
new file mode 100644
index 0000000..01814a6
--- /dev/null
+++ b/services/inputflinger/tests/SensorInputMapper_test.cpp
@@ -0,0 +1,183 @@
+/*
+ * Copyright 2024 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.
+ */
+
+#include "SensorInputMapper.h"
+
+#include <vector>
+
+#include <EventHub.h>
+#include <NotifyArgs.h>
+#include <gtest/gtest.h>
+#include <input/Input.h>
+#include <input/InputDevice.h>
+#include <linux/input-event-codes.h>
+
+#include "InputMapperTest.h"
+
+namespace android {
+
+class SensorInputMapperTest : public InputMapperTest {
+protected:
+    static const int32_t ACCEL_RAW_MIN;
+    static const int32_t ACCEL_RAW_MAX;
+    static const int32_t ACCEL_RAW_FUZZ;
+    static const int32_t ACCEL_RAW_FLAT;
+    static const int32_t ACCEL_RAW_RESOLUTION;
+
+    static const int32_t GYRO_RAW_MIN;
+    static const int32_t GYRO_RAW_MAX;
+    static const int32_t GYRO_RAW_FUZZ;
+    static const int32_t GYRO_RAW_FLAT;
+    static const int32_t GYRO_RAW_RESOLUTION;
+
+    static const float GRAVITY_MS2_UNIT;
+    static const float DEGREE_RADIAN_UNIT;
+
+    void prepareAccelAxes();
+    void prepareGyroAxes();
+    void setAccelProperties();
+    void setGyroProperties();
+    void SetUp() override { InputMapperTest::SetUp(DEVICE_CLASSES | InputDeviceClass::SENSOR); }
+};
+
+const int32_t SensorInputMapperTest::ACCEL_RAW_MIN = -32768;
+const int32_t SensorInputMapperTest::ACCEL_RAW_MAX = 32768;
+const int32_t SensorInputMapperTest::ACCEL_RAW_FUZZ = 16;
+const int32_t SensorInputMapperTest::ACCEL_RAW_FLAT = 0;
+const int32_t SensorInputMapperTest::ACCEL_RAW_RESOLUTION = 8192;
+
+const int32_t SensorInputMapperTest::GYRO_RAW_MIN = -2097152;
+const int32_t SensorInputMapperTest::GYRO_RAW_MAX = 2097152;
+const int32_t SensorInputMapperTest::GYRO_RAW_FUZZ = 16;
+const int32_t SensorInputMapperTest::GYRO_RAW_FLAT = 0;
+const int32_t SensorInputMapperTest::GYRO_RAW_RESOLUTION = 1024;
+
+const float SensorInputMapperTest::GRAVITY_MS2_UNIT = 9.80665f;
+const float SensorInputMapperTest::DEGREE_RADIAN_UNIT = 0.0174533f;
+
+void SensorInputMapperTest::prepareAccelAxes() {
+    mFakeEventHub->addAbsoluteAxis(EVENTHUB_ID, ABS_X, ACCEL_RAW_MIN, ACCEL_RAW_MAX, ACCEL_RAW_FUZZ,
+                                   ACCEL_RAW_FLAT, ACCEL_RAW_RESOLUTION);
+    mFakeEventHub->addAbsoluteAxis(EVENTHUB_ID, ABS_Y, ACCEL_RAW_MIN, ACCEL_RAW_MAX, ACCEL_RAW_FUZZ,
+                                   ACCEL_RAW_FLAT, ACCEL_RAW_RESOLUTION);
+    mFakeEventHub->addAbsoluteAxis(EVENTHUB_ID, ABS_Z, ACCEL_RAW_MIN, ACCEL_RAW_MAX, ACCEL_RAW_FUZZ,
+                                   ACCEL_RAW_FLAT, ACCEL_RAW_RESOLUTION);
+}
+
+void SensorInputMapperTest::prepareGyroAxes() {
+    mFakeEventHub->addAbsoluteAxis(EVENTHUB_ID, ABS_RX, GYRO_RAW_MIN, GYRO_RAW_MAX, GYRO_RAW_FUZZ,
+                                   GYRO_RAW_FLAT, GYRO_RAW_RESOLUTION);
+    mFakeEventHub->addAbsoluteAxis(EVENTHUB_ID, ABS_RY, GYRO_RAW_MIN, GYRO_RAW_MAX, GYRO_RAW_FUZZ,
+                                   GYRO_RAW_FLAT, GYRO_RAW_RESOLUTION);
+    mFakeEventHub->addAbsoluteAxis(EVENTHUB_ID, ABS_RZ, GYRO_RAW_MIN, GYRO_RAW_MAX, GYRO_RAW_FUZZ,
+                                   GYRO_RAW_FLAT, GYRO_RAW_RESOLUTION);
+}
+
+void SensorInputMapperTest::setAccelProperties() {
+    mFakeEventHub->addSensorAxis(EVENTHUB_ID, /* absCode */ 0, InputDeviceSensorType::ACCELEROMETER,
+                                 /* sensorDataIndex */ 0);
+    mFakeEventHub->addSensorAxis(EVENTHUB_ID, /* absCode */ 1, InputDeviceSensorType::ACCELEROMETER,
+                                 /* sensorDataIndex */ 1);
+    mFakeEventHub->addSensorAxis(EVENTHUB_ID, /* absCode */ 2, InputDeviceSensorType::ACCELEROMETER,
+                                 /* sensorDataIndex */ 2);
+    mFakeEventHub->setMscEvent(EVENTHUB_ID, MSC_TIMESTAMP);
+    addConfigurationProperty("sensor.accelerometer.reportingMode", "0");
+    addConfigurationProperty("sensor.accelerometer.maxDelay", "100000");
+    addConfigurationProperty("sensor.accelerometer.minDelay", "5000");
+    addConfigurationProperty("sensor.accelerometer.power", "1.5");
+}
+
+void SensorInputMapperTest::setGyroProperties() {
+    mFakeEventHub->addSensorAxis(EVENTHUB_ID, /* absCode */ 3, InputDeviceSensorType::GYROSCOPE,
+                                 /* sensorDataIndex */ 0);
+    mFakeEventHub->addSensorAxis(EVENTHUB_ID, /* absCode */ 4, InputDeviceSensorType::GYROSCOPE,
+                                 /* sensorDataIndex */ 1);
+    mFakeEventHub->addSensorAxis(EVENTHUB_ID, /* absCode */ 5, InputDeviceSensorType::GYROSCOPE,
+                                 /* sensorDataIndex */ 2);
+    mFakeEventHub->setMscEvent(EVENTHUB_ID, MSC_TIMESTAMP);
+    addConfigurationProperty("sensor.gyroscope.reportingMode", "0");
+    addConfigurationProperty("sensor.gyroscope.maxDelay", "100000");
+    addConfigurationProperty("sensor.gyroscope.minDelay", "5000");
+    addConfigurationProperty("sensor.gyroscope.power", "0.8");
+}
+
+TEST_F(SensorInputMapperTest, GetSources) {
+    SensorInputMapper& mapper = constructAndAddMapper<SensorInputMapper>();
+
+    ASSERT_EQ(static_cast<uint32_t>(AINPUT_SOURCE_SENSOR), mapper.getSources());
+}
+
+TEST_F(SensorInputMapperTest, ProcessAccelerometerSensor) {
+    setAccelProperties();
+    prepareAccelAxes();
+    SensorInputMapper& mapper = constructAndAddMapper<SensorInputMapper>();
+
+    ASSERT_TRUE(mapper.enableSensor(InputDeviceSensorType::ACCELEROMETER,
+                                    std::chrono::microseconds(10000),
+                                    std::chrono::microseconds(0)));
+    ASSERT_TRUE(mFakeEventHub->isDeviceEnabled(EVENTHUB_ID));
+    process(mapper, ARBITRARY_TIME, READ_TIME, EV_ABS, ABS_X, 20000);
+    process(mapper, ARBITRARY_TIME, READ_TIME, EV_ABS, ABS_Y, -20000);
+    process(mapper, ARBITRARY_TIME, READ_TIME, EV_ABS, ABS_Z, 40000);
+    process(mapper, ARBITRARY_TIME, READ_TIME, EV_MSC, MSC_TIMESTAMP, 1000);
+    process(mapper, ARBITRARY_TIME, READ_TIME, EV_SYN, SYN_REPORT, 0);
+
+    NotifySensorArgs args;
+    std::vector<float> values = {20000.0f / ACCEL_RAW_RESOLUTION * GRAVITY_MS2_UNIT,
+                                 -20000.0f / ACCEL_RAW_RESOLUTION * GRAVITY_MS2_UNIT,
+                                 40000.0f / ACCEL_RAW_RESOLUTION * GRAVITY_MS2_UNIT};
+
+    ASSERT_NO_FATAL_FAILURE(mFakeListener->assertNotifySensorWasCalled(&args));
+    ASSERT_EQ(args.source, AINPUT_SOURCE_SENSOR);
+    ASSERT_EQ(args.deviceId, DEVICE_ID);
+    ASSERT_EQ(args.sensorType, InputDeviceSensorType::ACCELEROMETER);
+    ASSERT_EQ(args.accuracy, InputDeviceSensorAccuracy::ACCURACY_HIGH);
+    ASSERT_EQ(args.hwTimestamp, ARBITRARY_TIME);
+    ASSERT_EQ(args.values, values);
+    mapper.flushSensor(InputDeviceSensorType::ACCELEROMETER);
+}
+
+TEST_F(SensorInputMapperTest, ProcessGyroscopeSensor) {
+    setGyroProperties();
+    prepareGyroAxes();
+    SensorInputMapper& mapper = constructAndAddMapper<SensorInputMapper>();
+
+    ASSERT_TRUE(mapper.enableSensor(InputDeviceSensorType::GYROSCOPE,
+                                    std::chrono::microseconds(10000),
+                                    std::chrono::microseconds(0)));
+    ASSERT_TRUE(mFakeEventHub->isDeviceEnabled(EVENTHUB_ID));
+    process(mapper, ARBITRARY_TIME, READ_TIME, EV_ABS, ABS_RX, 20000);
+    process(mapper, ARBITRARY_TIME, READ_TIME, EV_ABS, ABS_RY, -20000);
+    process(mapper, ARBITRARY_TIME, READ_TIME, EV_ABS, ABS_RZ, 40000);
+    process(mapper, ARBITRARY_TIME, READ_TIME, EV_MSC, MSC_TIMESTAMP, 1000);
+    process(mapper, ARBITRARY_TIME, READ_TIME, EV_SYN, SYN_REPORT, 0);
+
+    NotifySensorArgs args;
+    std::vector<float> values = {20000.0f / GYRO_RAW_RESOLUTION * DEGREE_RADIAN_UNIT,
+                                 -20000.0f / GYRO_RAW_RESOLUTION * DEGREE_RADIAN_UNIT,
+                                 40000.0f / GYRO_RAW_RESOLUTION * DEGREE_RADIAN_UNIT};
+
+    ASSERT_NO_FATAL_FAILURE(mFakeListener->assertNotifySensorWasCalled(&args));
+    ASSERT_EQ(args.source, AINPUT_SOURCE_SENSOR);
+    ASSERT_EQ(args.deviceId, DEVICE_ID);
+    ASSERT_EQ(args.sensorType, InputDeviceSensorType::GYROSCOPE);
+    ASSERT_EQ(args.accuracy, InputDeviceSensorAccuracy::ACCURACY_HIGH);
+    ASSERT_EQ(args.hwTimestamp, ARBITRARY_TIME);
+    ASSERT_EQ(args.values, values);
+    mapper.flushSensor(InputDeviceSensorType::GYROSCOPE);
+}
+
+} // namespace android
\ No newline at end of file
diff --git a/services/powermanager/tests/PowerHalWrapperAidlTest.cpp b/services/powermanager/tests/PowerHalWrapperAidlTest.cpp
index 1589c99..f5c4fc5 100644
--- a/services/powermanager/tests/PowerHalWrapperAidlTest.cpp
+++ b/services/powermanager/tests/PowerHalWrapperAidlTest.cpp
@@ -35,6 +35,7 @@
 using aidl::android::hardware::power::Mode;
 using aidl::android::hardware::power::SessionConfig;
 using aidl::android::hardware::power::SessionTag;
+using aidl::android::hardware::power::SupportInfo;
 using android::binder::Status;
 
 using namespace android;
@@ -65,6 +66,7 @@
                 (int32_t tgid, int32_t uid, ChannelConfig* _aidl_return), (override));
     MOCK_METHOD(ndk::ScopedAStatus, closeSessionChannel, (int32_t tgid, int32_t uid), (override));
     MOCK_METHOD(ndk::ScopedAStatus, getHintSessionPreferredRate, (int64_t * rate), (override));
+    MOCK_METHOD(ndk::ScopedAStatus, getSupportInfo, (SupportInfo * _aidl_return), (override));
     MOCK_METHOD(ndk::ScopedAStatus, getInterfaceVersion, (int32_t * version), (override));
     MOCK_METHOD(ndk::ScopedAStatus, getInterfaceHash, (std::string * hash), (override));
     MOCK_METHOD(ndk::SpAIBinder, asBinder, (), (override));
diff --git a/services/surfaceflinger/Android.bp b/services/surfaceflinger/Android.bp
index d500ae8..f1c79c1 100644
--- a/services/surfaceflinger/Android.bp
+++ b/services/surfaceflinger/Android.bp
@@ -148,6 +148,46 @@
     },
 }
 
+// libsurfaceflinger_backend_{headers|sources} are a step towards pulling out
+// the "backend" sources to clean up the dependency graph between
+// CompositionEngine and SurfaceFlinger. Completing the cleanup would require
+// moving the headers in particular so that the dependency can strictly be a
+// DAG. There would certainly be additional cleanups: VirtualDisplaySurface.cpp
+// and FrameBufferSurface.cpp likely belong in CompositionEngine for example.
+cc_library_headers {
+    name: "libsurfaceflinger_backend_headers",
+    export_include_dirs: ["."],
+    static_libs: ["libserviceutils"],
+    export_static_lib_headers: ["libserviceutils"],
+
+    shared_libs: [
+        "android.hardware.configstore-utils",
+        "android.hardware.configstore@1.0",
+        "android.hardware.configstore@1.1",
+        "libbinder_ndk",
+    ],
+    export_shared_lib_headers: [
+        "android.hardware.configstore-utils",
+        "android.hardware.configstore@1.0",
+        "android.hardware.configstore@1.1",
+        "libbinder_ndk",
+    ],
+}
+
+filegroup {
+    name: "libsurfaceflinger_backend_sources",
+    srcs: [
+        "DisplayHardware/AidlComposerHal.cpp",
+        "DisplayHardware/ComposerHal.cpp",
+        "DisplayHardware/FramebufferSurface.cpp",
+        "DisplayHardware/HWC2.cpp",
+        "DisplayHardware/HWComposer.cpp",
+        "DisplayHardware/HidlComposerHal.cpp",
+        "DisplayHardware/PowerAdvisor.cpp",
+        "DisplayHardware/VirtualDisplaySurface.cpp",
+    ],
+}
+
 cc_library_headers {
     name: "libsurfaceflinger_headers",
     export_include_dirs: ["."],
@@ -158,20 +198,13 @@
 filegroup {
     name: "libsurfaceflinger_sources",
     srcs: [
+        ":libsurfaceflinger_backend_sources",
         "BackgroundExecutor.cpp",
         "Client.cpp",
         "ClientCache.cpp",
         "Display/DisplayModeController.cpp",
         "Display/DisplaySnapshot.cpp",
         "DisplayDevice.cpp",
-        "DisplayHardware/AidlComposerHal.cpp",
-        "DisplayHardware/ComposerHal.cpp",
-        "DisplayHardware/FramebufferSurface.cpp",
-        "DisplayHardware/HWC2.cpp",
-        "DisplayHardware/HWComposer.cpp",
-        "DisplayHardware/HidlComposerHal.cpp",
-        "DisplayHardware/PowerAdvisor.cpp",
-        "DisplayHardware/VirtualDisplaySurface.cpp",
         "DisplayRenderArea.cpp",
         "Effects/Daltonizer.cpp",
         "FrontEnd/LayerCreationArgs.cpp",
@@ -251,7 +284,6 @@
     ],
     static_libs: [
         "android.frameworks.displayservice@1.0",
-        "libc++fs",
         "libdisplayservicehidl",
         "libserviceutils",
     ],
diff --git a/services/surfaceflinger/CompositionEngine/Android.bp b/services/surfaceflinger/CompositionEngine/Android.bp
index b4ac9ba..7095b9d 100644
--- a/services/surfaceflinger/CompositionEngine/Android.bp
+++ b/services/surfaceflinger/CompositionEngine/Android.bp
@@ -59,7 +59,7 @@
         "android.hardware.graphics.composer@2.3-command-buffer",
         "android.hardware.graphics.composer@2.4-command-buffer",
         "android.hardware.graphics.composer3-command-buffer",
-        "libsurfaceflinger_headers",
+        "libsurfaceflinger_backend_headers",
     ],
 }
 
@@ -141,6 +141,8 @@
     ],
     srcs: [
         ":libcompositionengine_sources",
+        ":libsurfaceflinger_backend_mock_sources",
+        ":libsurfaceflinger_backend_sources",
         "tests/planner/CachedSetTest.cpp",
         "tests/planner/FlattenerTest.cpp",
         "tests/planner/LayerStateTest.cpp",
@@ -151,14 +153,14 @@
         "tests/DisplayTest.cpp",
         "tests/HwcAsyncWorkerTest.cpp",
         "tests/HwcBufferCacheTest.cpp",
-        "tests/MockHWC2.cpp",
-        "tests/MockHWComposer.cpp",
-        "tests/MockPowerAdvisor.cpp",
         "tests/OutputLayerTest.cpp",
         "tests/OutputTest.cpp",
         "tests/ProjectionSpaceTest.cpp",
         "tests/RenderSurfaceTest.cpp",
     ],
+    header_libs: [
+        "libsurfaceflinger_backend_mock_headers",
+    ],
     static_libs: [
         "libcompositionengine_mocks",
         "libgui_mocks",
@@ -167,6 +169,7 @@
         "libgtest",
     ],
     shared_libs: [
+        "libbinder_ndk",
         // For some reason, libvulkan isn't picked up from librenderengine
         // Probably ASAN related?
         "libvulkan",
diff --git a/services/surfaceflinger/CompositionEngine/tests/CompositionEngineTest.cpp b/services/surfaceflinger/CompositionEngine/tests/CompositionEngineTest.cpp
index 48ebc32..3e0c390 100644
--- a/services/surfaceflinger/CompositionEngine/tests/CompositionEngineTest.cpp
+++ b/services/surfaceflinger/CompositionEngine/tests/CompositionEngineTest.cpp
@@ -26,9 +26,8 @@
 #include <gtest/gtest.h>
 #include <renderengine/mock/RenderEngine.h>
 
-#include "MockHWComposer.h"
 #include "TimeStats/TimeStats.h"
-#include "gmock/gmock.h"
+#include "mock/DisplayHardware/MockHWComposer.h"
 
 using namespace com::android::graphics::surfaceflinger;
 
diff --git a/services/surfaceflinger/CompositionEngine/tests/DisplayTest.cpp b/services/surfaceflinger/CompositionEngine/tests/DisplayTest.cpp
index 9c0e62c..416001e 100644
--- a/services/surfaceflinger/CompositionEngine/tests/DisplayTest.cpp
+++ b/services/surfaceflinger/CompositionEngine/tests/DisplayTest.cpp
@@ -36,10 +36,10 @@
 #include <ui/Rect.h>
 #include <ui/StaticDisplayInfo.h>
 
-#include "MockHWC2.h"
-#include "MockHWComposer.h"
-#include "MockPowerAdvisor.h"
 #include "ftl/future.h"
+#include "mock/DisplayHardware/MockHWC2.h"
+#include "mock/DisplayHardware/MockHWComposer.h"
+#include "mock/DisplayHardware/MockPowerAdvisor.h"
 
 #include <aidl/android/hardware/graphics/composer3/Composition.h>
 
diff --git a/services/surfaceflinger/CompositionEngine/tests/MockHWC2.cpp b/services/surfaceflinger/CompositionEngine/tests/MockHWC2.cpp
deleted file mode 100644
index 0baa79d..0000000
--- a/services/surfaceflinger/CompositionEngine/tests/MockHWC2.cpp
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
- * Copyright 2019 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.
- */
-
-#include "MockHWC2.h"
-
-namespace android::HWC2 {
-
-// This will go away once HWC2::Layer is moved into the "backend" library
-Layer::~Layer() = default;
-
-namespace mock {
-
-// The Google Mock documentation recommends explicit non-header instantiations
-// for better compile time performance.
-Layer::Layer() = default;
-Layer::~Layer() = default;
-
-} // namespace mock
-} // namespace android::HWC2
diff --git a/services/surfaceflinger/CompositionEngine/tests/MockHWC2.h b/services/surfaceflinger/CompositionEngine/tests/MockHWC2.h
deleted file mode 100644
index 26b5f4a..0000000
--- a/services/surfaceflinger/CompositionEngine/tests/MockHWC2.h
+++ /dev/null
@@ -1,86 +0,0 @@
-/*
- * Copyright 2019 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.
- */
-
-#pragma once
-
-#include <gmock/gmock.h>
-#include <ui/Fence.h>
-#include <ui/FloatRect.h>
-#include <ui/GraphicBuffer.h>
-#include <ui/Rect.h>
-#include <ui/Region.h>
-#include <ui/Transform.h>
-
-// TODO(b/129481165): remove the #pragma below and fix conversion issues
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wconversion"
-#pragma clang diagnostic ignored "-Wextra"
-
-#include <ui/GraphicTypes.h>
-#include "DisplayHardware/HWC2.h"
-
-#include <aidl/android/hardware/graphics/composer3/Composition.h>
-#include <aidl/android/hardware/graphics/composer3/Luts.h>
-
-// TODO(b/129481165): remove the #pragma below and fix conversion issues
-#pragma clang diagnostic pop // ignored "-Wconversion -Wextra"
-
-namespace android {
-namespace HWC2 {
-namespace mock {
-
-namespace hal = android::hardware::graphics::composer::hal;
-
-using Error = hal::Error;
-
-class Layer : public HWC2::Layer {
-public:
-    Layer();
-    ~Layer() override;
-
-    MOCK_CONST_METHOD0(getId, hal::HWLayerId());
-
-    MOCK_METHOD2(setCursorPosition, Error(int32_t, int32_t));
-    MOCK_METHOD3(setBuffer,
-                 Error(uint32_t, const android::sp<android::GraphicBuffer>&,
-                       const android::sp<android::Fence>&));
-    MOCK_METHOD2(setBufferSlotsToClear, Error(const std::vector<uint32_t>&, uint32_t));
-    MOCK_METHOD1(setSurfaceDamage, Error(const android::Region&));
-    MOCK_METHOD1(setBlendMode, Error(hal::BlendMode));
-    MOCK_METHOD1(setColor, Error(aidl::android::hardware::graphics::composer3::Color));
-    MOCK_METHOD1(setCompositionType,
-                 Error(aidl::android::hardware::graphics::composer3::Composition));
-    MOCK_METHOD1(setDataspace, Error(android::ui::Dataspace));
-    MOCK_METHOD2(setPerFrameMetadata, Error(const int32_t, const android::HdrMetadata&));
-    MOCK_METHOD1(setDisplayFrame, Error(const android::Rect&));
-    MOCK_METHOD1(setPlaneAlpha, Error(float));
-    MOCK_METHOD1(setSidebandStream, Error(const native_handle_t*));
-    MOCK_METHOD1(setSourceCrop, Error(const android::FloatRect&));
-    MOCK_METHOD1(setTransform, Error(hal::Transform));
-    MOCK_METHOD1(setVisibleRegion, Error(const android::Region&));
-    MOCK_METHOD1(setZOrder, Error(uint32_t));
-
-    MOCK_METHOD1(setColorTransform, Error(const android::mat4&));
-    MOCK_METHOD3(setLayerGenericMetadata,
-                 Error(const std::string&, bool, const std::vector<uint8_t>&));
-    MOCK_METHOD1(setBrightness, Error(float));
-    MOCK_METHOD1(setBlockingRegion, Error(const android::Region&));
-    MOCK_METHOD(Error, setLuts, (aidl::android::hardware::graphics::composer3::Luts&));
-};
-
-} // namespace mock
-} // namespace HWC2
-} // namespace android
diff --git a/services/surfaceflinger/CompositionEngine/tests/MockHWComposer.h b/services/surfaceflinger/CompositionEngine/tests/MockHWComposer.h
deleted file mode 100644
index 5c55ce7..0000000
--- a/services/surfaceflinger/CompositionEngine/tests/MockHWComposer.h
+++ /dev/null
@@ -1,159 +0,0 @@
-/*
- * Copyright 2018 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.
- */
-
-#pragma once
-
-#include <compositionengine/Output.h>
-#include <gmock/gmock.h>
-
-// TODO(b/129481165): remove the #pragma below and fix conversion issues
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wconversion"
-#pragma clang diagnostic ignored "-Wextra"
-
-#include "DisplayHardware/HWComposer.h"
-
-// TODO(b/129481165): remove the #pragma below and fix conversion issues
-#pragma clang diagnostic pop // ignored "-Wconversion -Wextra"
-
-namespace android {
-namespace mock {
-
-namespace hal = android::hardware::graphics::composer::hal;
-
-class HWComposer : public android::HWComposer {
-public:
-    HWComposer();
-    ~HWComposer() override;
-
-    MOCK_METHOD1(setCallback, void(HWC2::ComposerCallback&));
-    MOCK_CONST_METHOD3(getDisplayIdentificationData,
-                       bool(hal::HWDisplayId, uint8_t*, DisplayIdentificationData*));
-    MOCK_CONST_METHOD1(hasCapability,
-                       bool(aidl::android::hardware::graphics::composer3::Capability));
-    MOCK_CONST_METHOD2(hasDisplayCapability,
-                       bool(HalDisplayId,
-                            aidl::android::hardware::graphics::composer3::DisplayCapability));
-
-    MOCK_CONST_METHOD0(getMaxVirtualDisplayCount, size_t());
-    MOCK_CONST_METHOD0(getMaxVirtualDisplayDimension, size_t());
-    MOCK_METHOD3(allocateVirtualDisplay, bool(HalVirtualDisplayId, ui::Size, ui::PixelFormat*));
-    MOCK_METHOD3(allocatePhysicalDisplay,
-                 void(hal::HWDisplayId, PhysicalDisplayId, std::optional<ui::Size>));
-
-    MOCK_METHOD1(createLayer, std::shared_ptr<HWC2::Layer>(HalDisplayId));
-    MOCK_METHOD(status_t, getDeviceCompositionChanges,
-                (HalDisplayId, bool, std::optional<std::chrono::steady_clock::time_point>, nsecs_t,
-                 Fps, std::optional<android::HWComposer::DeviceRequestedChanges>*));
-    MOCK_METHOD(status_t, setClientTarget,
-                (HalDisplayId, uint32_t, const sp<Fence>&, const sp<GraphicBuffer>&, ui::Dataspace,
-                 float),
-                (override));
-    MOCK_METHOD2(presentAndGetReleaseFences,
-                 status_t(HalDisplayId, std::optional<std::chrono::steady_clock::time_point>));
-    MOCK_METHOD(status_t, executeCommands, (HalDisplayId));
-    MOCK_METHOD2(setPowerMode, status_t(PhysicalDisplayId, hal::PowerMode));
-    MOCK_METHOD2(setActiveConfig, status_t(HalDisplayId, size_t));
-    MOCK_METHOD2(setColorTransform, status_t(HalDisplayId, const mat4&));
-    MOCK_METHOD1(disconnectDisplay, void(HalDisplayId));
-    MOCK_CONST_METHOD1(hasDeviceComposition, bool(const std::optional<DisplayId>&));
-    MOCK_CONST_METHOD1(getPresentFence, sp<Fence>(HalDisplayId));
-    MOCK_METHOD(nsecs_t, getPresentTimestamp, (PhysicalDisplayId), (const, override));
-    MOCK_CONST_METHOD2(getLayerReleaseFence, sp<Fence>(HalDisplayId, HWC2::Layer*));
-    MOCK_METHOD3(setOutputBuffer,
-                 status_t(HalVirtualDisplayId, const sp<Fence>&, const sp<GraphicBuffer>&));
-    MOCK_METHOD1(clearReleaseFences, void(HalDisplayId));
-    MOCK_METHOD2(getHdrCapabilities, status_t(HalDisplayId, HdrCapabilities*));
-    MOCK_CONST_METHOD1(getSupportedPerFrameMetadata, int32_t(HalDisplayId));
-    MOCK_CONST_METHOD2(getRenderIntents,
-                       std::vector<ui::RenderIntent>(HalDisplayId, ui::ColorMode));
-    MOCK_METHOD2(getDataspaceSaturationMatrix, mat4(HalDisplayId, ui::Dataspace));
-    MOCK_METHOD4(getDisplayedContentSamplingAttributes,
-                 status_t(HalDisplayId, ui::PixelFormat*, ui::Dataspace*, uint8_t*));
-    MOCK_METHOD4(setDisplayContentSamplingEnabled, status_t(HalDisplayId, bool, uint8_t, uint64_t));
-    MOCK_METHOD4(getDisplayedContentSample,
-                 status_t(HalDisplayId, uint64_t, uint64_t, DisplayedFrameStats*));
-    MOCK_METHOD(ftl::Future<status_t>, setDisplayBrightness,
-                (PhysicalDisplayId, float, float, const Hwc2::Composer::DisplayBrightnessOptions&),
-                (override));
-    MOCK_METHOD2(getDisplayBrightnessSupport, status_t(PhysicalDisplayId, bool*));
-
-    MOCK_METHOD2(onHotplug,
-                 std::optional<DisplayIdentificationInfo>(hal::HWDisplayId, hal::Connection));
-    MOCK_CONST_METHOD0(updatesDeviceProductInfoOnHotplugReconnect, bool());
-    MOCK_METHOD(std::optional<PhysicalDisplayId>, onVsync, (hal::HWDisplayId, int64_t));
-    MOCK_METHOD2(setVsyncEnabled, void(PhysicalDisplayId, hal::Vsync));
-    MOCK_CONST_METHOD1(isConnected, bool(PhysicalDisplayId));
-    MOCK_CONST_METHOD2(getModes,
-                       std::vector<HWComposer::HWCDisplayMode>(PhysicalDisplayId, int32_t));
-    MOCK_CONST_METHOD1(getActiveMode, ftl::Expected<hal::HWConfigId, status_t>(PhysicalDisplayId));
-    MOCK_CONST_METHOD1(getColorModes, std::vector<ui::ColorMode>(PhysicalDisplayId));
-    MOCK_METHOD3(setActiveColorMode, status_t(PhysicalDisplayId, ui::ColorMode, ui::RenderIntent));
-    MOCK_CONST_METHOD0(isUsingVrComposer, bool());
-    MOCK_CONST_METHOD1(getDisplayConnectionType, ui::DisplayConnectionType(PhysicalDisplayId));
-    MOCK_CONST_METHOD1(isVsyncPeriodSwitchSupported, bool(PhysicalDisplayId));
-    MOCK_CONST_METHOD1(getDisplayVsyncPeriod, ftl::Expected<nsecs_t, status_t>(PhysicalDisplayId));
-    MOCK_METHOD4(setActiveModeWithConstraints,
-                 status_t(PhysicalDisplayId, hal::HWConfigId,
-                          const hal::VsyncPeriodChangeConstraints&,
-                          hal::VsyncPeriodChangeTimeline*));
-    MOCK_METHOD2(setBootDisplayMode, status_t(PhysicalDisplayId, hal::HWConfigId));
-    MOCK_METHOD1(clearBootDisplayMode, status_t(PhysicalDisplayId));
-    MOCK_METHOD1(getPreferredBootDisplayMode, std::optional<hal::HWConfigId>(PhysicalDisplayId));
-    MOCK_METHOD0(getBootDisplayModeSupport, bool());
-    MOCK_CONST_METHOD0(
-            getHdrConversionCapabilities,
-            std::vector<aidl::android::hardware::graphics::common::HdrConversionCapability>());
-    MOCK_METHOD2(setHdrConversionStrategy,
-                 status_t(aidl::android::hardware::graphics::common::HdrConversionStrategy,
-                          aidl::android::hardware::graphics::common::Hdr*));
-    MOCK_METHOD2(setAutoLowLatencyMode, status_t(PhysicalDisplayId, bool));
-    MOCK_METHOD(status_t, getSupportedContentTypes,
-                (PhysicalDisplayId, std::vector<hal::ContentType>*), (const, override));
-    MOCK_METHOD2(setContentType, status_t(PhysicalDisplayId, hal::ContentType));
-    MOCK_CONST_METHOD0(getSupportedLayerGenericMetadata,
-                       const std::unordered_map<std::string, bool>&());
-
-    MOCK_CONST_METHOD1(dump, void(std::string&));
-    MOCK_CONST_METHOD1(dumpOverlayProperties, void(std::string&));
-    MOCK_CONST_METHOD0(getComposer, android::Hwc2::Composer*());
-
-    MOCK_METHOD(hal::HWDisplayId, getPrimaryHwcDisplayId, (), (const, override));
-    MOCK_METHOD(PhysicalDisplayId, getPrimaryDisplayId, (), (const, override));
-    MOCK_METHOD(bool, isHeadless, (), (const, override));
-
-    MOCK_METHOD(std::optional<PhysicalDisplayId>, toPhysicalDisplayId, (hal::HWDisplayId),
-                (const, override));
-    MOCK_METHOD(std::optional<hal::HWDisplayId>, fromPhysicalDisplayId, (PhysicalDisplayId),
-                (const, override));
-    MOCK_METHOD2(getDisplayDecorationSupport,
-                 status_t(PhysicalDisplayId,
-                          std::optional<aidl::android::hardware::graphics::common::
-                                                DisplayDecorationSupport>* support));
-    MOCK_METHOD2(setIdleTimerEnabled, status_t(PhysicalDisplayId, std::chrono::milliseconds));
-    MOCK_METHOD(bool, hasDisplayIdleTimerCapability, (PhysicalDisplayId), (const, override));
-    MOCK_METHOD(Hwc2::AidlTransform, getPhysicalDisplayOrientation, (PhysicalDisplayId),
-                (const, override));
-    MOCK_METHOD(bool, getValidateSkipped, (HalDisplayId), (const, override));
-    MOCK_METHOD(const aidl::android::hardware::graphics::composer3::OverlayProperties&,
-                getOverlaySupport, (), (const, override));
-    MOCK_METHOD(status_t, setRefreshRateChangedCallbackDebugEnabled, (PhysicalDisplayId, bool));
-    MOCK_METHOD(status_t, notifyExpectedPresent, (PhysicalDisplayId, TimePoint, Fps));
-    MOCK_METHOD((HWC2::Display::LutFileDescriptorMapper&), getLutFileDescriptorMapper, (), ());
-};
-
-} // namespace mock
-} // namespace android
diff --git a/services/surfaceflinger/CompositionEngine/tests/MockPowerAdvisor.cpp b/services/surfaceflinger/CompositionEngine/tests/MockPowerAdvisor.cpp
deleted file mode 100644
index 85b9403..0000000
--- a/services/surfaceflinger/CompositionEngine/tests/MockPowerAdvisor.cpp
+++ /dev/null
@@ -1,34 +0,0 @@
-/*
- * Copyright 2019 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.
- */
-
-#include "MockPowerAdvisor.h"
-
-namespace android {
-namespace Hwc2 {
-
-// This will go away once PowerAdvisor is moved into the "backend" library
-PowerAdvisor::~PowerAdvisor() = default;
-
-namespace mock {
-
-// The Google Mock documentation recommends explicit non-header instantiations
-// for better compile time performance.
-PowerAdvisor::PowerAdvisor() = default;
-PowerAdvisor::~PowerAdvisor() = default;
-
-} // namespace mock
-} // namespace Hwc2
-} // namespace android
diff --git a/services/surfaceflinger/CompositionEngine/tests/MockPowerAdvisor.h b/services/surfaceflinger/CompositionEngine/tests/MockPowerAdvisor.h
deleted file mode 100644
index ed2ffa9..0000000
--- a/services/surfaceflinger/CompositionEngine/tests/MockPowerAdvisor.h
+++ /dev/null
@@ -1,72 +0,0 @@
-/*
- * Copyright 2019 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.
- */
-
-#pragma once
-
-#include <gmock/gmock.h>
-
-#include "DisplayHardware/PowerAdvisor.h"
-
-namespace android {
-namespace Hwc2 {
-namespace mock {
-
-class PowerAdvisor : public android::Hwc2::PowerAdvisor {
-public:
-    PowerAdvisor();
-    ~PowerAdvisor() override;
-
-    MOCK_METHOD(void, init, (), (override));
-    MOCK_METHOD(void, onBootFinished, (), (override));
-    MOCK_METHOD(void, setExpensiveRenderingExpected, (DisplayId displayId, bool expected),
-                (override));
-    MOCK_METHOD(bool, isUsingExpensiveRendering, (), (override));
-    MOCK_METHOD(void, notifyCpuLoadUp, (), (override));
-    MOCK_METHOD(void, notifyDisplayUpdateImminentAndCpuReset, (), (override));
-    MOCK_METHOD(bool, usePowerHintSession, (), (override));
-    MOCK_METHOD(bool, supportsPowerHintSession, (), (override));
-    MOCK_METHOD(bool, supportsGpuReporting, (), (override));
-    MOCK_METHOD(void, updateTargetWorkDuration, (Duration targetDuration), (override));
-    MOCK_METHOD(void, reportActualWorkDuration, (), (override));
-    MOCK_METHOD(void, enablePowerHintSession, (bool enabled), (override));
-    MOCK_METHOD(bool, startPowerHintSession, (std::vector<int32_t> && threadIds), (override));
-    MOCK_METHOD(void, setGpuStartTime, (DisplayId displayId, TimePoint startTime), (override));
-    MOCK_METHOD(void, setGpuFenceTime,
-                (DisplayId displayId, std::unique_ptr<FenceTime>&& fenceTime), (override));
-    MOCK_METHOD(void, setHwcValidateTiming,
-                (DisplayId displayId, TimePoint validateStartTime, TimePoint validateEndTime),
-                (override));
-    MOCK_METHOD(void, setHwcPresentTiming,
-                (DisplayId displayId, TimePoint presentStartTime, TimePoint presentEndTime),
-                (override));
-    MOCK_METHOD(void, setSkippedValidate, (DisplayId displayId, bool skipped), (override));
-    MOCK_METHOD(void, setRequiresRenderEngine, (DisplayId displayId, bool requiresRenderEngine),
-                (override));
-    MOCK_METHOD(void, setExpectedPresentTime, (TimePoint expectedPresentTime), (override));
-    MOCK_METHOD(void, setSfPresentTiming, (TimePoint presentFenceTime, TimePoint presentEndTime),
-                (override));
-    MOCK_METHOD(void, setHwcPresentDelayedTime,
-                (DisplayId displayId, TimePoint earliestFrameStartTime));
-    MOCK_METHOD(void, setFrameDelay, (Duration frameDelayDuration), (override));
-    MOCK_METHOD(void, setCommitStart, (TimePoint commitStartTime), (override));
-    MOCK_METHOD(void, setCompositeEnd, (TimePoint compositeEndTime), (override));
-    MOCK_METHOD(void, setDisplays, (std::vector<DisplayId> & displayIds), (override));
-    MOCK_METHOD(void, setTotalFrameTargetWorkDuration, (Duration targetDuration), (override));
-};
-
-} // namespace mock
-} // namespace Hwc2
-} // namespace android
diff --git a/services/surfaceflinger/CompositionEngine/tests/OutputLayerTest.cpp b/services/surfaceflinger/CompositionEngine/tests/OutputLayerTest.cpp
index b21533a..f2c5672 100644
--- a/services/surfaceflinger/CompositionEngine/tests/OutputLayerTest.cpp
+++ b/services/surfaceflinger/CompositionEngine/tests/OutputLayerTest.cpp
@@ -23,14 +23,14 @@
 #include <compositionengine/mock/Output.h>
 #include <gtest/gtest.h>
 #include <log/log.h>
-
 #include <renderengine/impl/ExternalTexture.h>
 #include <renderengine/mock/RenderEngine.h>
+#include <ui/FloatRect.h>
 #include <ui/PixelFormat.h>
-#include "MockHWC2.h"
-#include "MockHWComposer.h"
+
 #include "RegionMatcher.h"
-#include "ui/FloatRect.h"
+#include "mock/DisplayHardware/MockHWC2.h"
+#include "mock/DisplayHardware/MockHWComposer.h"
 
 #include <aidl/android/hardware/graphics/composer3/Composition.h>
 
diff --git a/services/surfaceflinger/CompositionEngine/tests/OutputTest.cpp b/services/surfaceflinger/CompositionEngine/tests/OutputTest.cpp
index 74ff124..fe7dd9a 100644
--- a/services/surfaceflinger/CompositionEngine/tests/OutputTest.cpp
+++ b/services/surfaceflinger/CompositionEngine/tests/OutputTest.cpp
@@ -40,8 +40,8 @@
 #include <common/FlagManager.h>
 #include <common/test/FlagUtils.h>
 #include "CallOrderStateMachineHelper.h"
-#include "MockHWC2.h"
 #include "RegionMatcher.h"
+#include "mock/DisplayHardware/MockHWC2.h"
 
 namespace android::compositionengine {
 namespace {
diff --git a/services/surfaceflinger/FrontEnd/readme.md b/services/surfaceflinger/FrontEnd/readme.md
index e5f51a5..6258f7e 100644
--- a/services/surfaceflinger/FrontEnd/readme.md
+++ b/services/surfaceflinger/FrontEnd/readme.md
@@ -17,6 +17,29 @@
 This allows control to be delegated to different parts of the system - such as SystemServer,
 SysUI and Apps.
 
+### Layer Drawing Order
+Layers are drawn based on an inorder traversal, treating relative parents as
+direct parents. Negative z-values place layers below their parent, while
+non-negative values place them above. Layers with the same z-value are drawn
+in creation order (newer on top).  However, relying on creation order for
+z-ordering is discouraged; use unique z-values whenever possible for better
+control.
+
+Traversal pseudo code:
+```
+fn traverseBottomToTop(root):
+  for each child node including relative children,
+    sorted by z then layer id, with z less than 0:
+          traverseBottomToTop(childNode)
+
+  visit(root)
+
+  for each child node including relative children,
+    sorted by z then layer id, with z greater than
+    or equal to 0:
+          traverseBottomToTop(childNode)
+```
+
 ### Layer Lifecycle
 Layer is created by a client. The client receives a strong binder reference to the layer
 handle, which will keep the layer alive as long as the client holds the reference. The
diff --git a/services/surfaceflinger/Layer.cpp b/services/surfaceflinger/Layer.cpp
index c88092b..20ba45f 100644
--- a/services/surfaceflinger/Layer.cpp
+++ b/services/surfaceflinger/Layer.cpp
@@ -689,8 +689,20 @@
         listener->onReleaseBuffer(callbackId, fence, currentMaxAcquiredBufferCount);
     }
 
-    if (mBufferReleaseChannel) {
-        mBufferReleaseChannel->writeReleaseFence(callbackId, fence, currentMaxAcquiredBufferCount);
+    if (!mBufferReleaseChannel) {
+        return;
+    }
+
+    status_t status = mBufferReleaseChannel->writeReleaseFence(callbackId, fence,
+                                                               currentMaxAcquiredBufferCount);
+    if (status != OK) {
+        int error = -status;
+        // callReleaseBufferCallback is called during Layer's destructor. In this case, it's
+        // expected to receive connection errors.
+        if (error != EPIPE && error != ECONNRESET) {
+            ALOGD("[%s] writeReleaseFence failed. error %d (%s)", getDebugName(), error,
+                  strerror(error));
+        }
     }
 }
 
diff --git a/services/surfaceflinger/TransactionCallbackInvoker.cpp b/services/surfaceflinger/TransactionCallbackInvoker.cpp
index de4825b..b22ec66 100644
--- a/services/surfaceflinger/TransactionCallbackInvoker.cpp
+++ b/services/surfaceflinger/TransactionCallbackInvoker.cpp
@@ -144,7 +144,7 @@
                                                     eventStats, handle->previousReleaseCallbackId);
         if (handle->bufferReleaseChannel &&
             handle->previousReleaseCallbackId != ReleaseCallbackId::INVALID_ID) {
-            mBufferReleases.emplace_back(handle->bufferReleaseChannel,
+            mBufferReleases.emplace_back(handle->name, handle->bufferReleaseChannel,
                                          handle->previousReleaseCallbackId,
                                          handle->previousReleaseFence,
                                          handle->currentMaxAcquiredBufferCount);
@@ -159,8 +159,13 @@
 
 void TransactionCallbackInvoker::sendCallbacks(bool onCommitOnly) {
     for (const auto& bufferRelease : mBufferReleases) {
-        bufferRelease.channel->writeReleaseFence(bufferRelease.callbackId, bufferRelease.fence,
-                                                 bufferRelease.currentMaxAcquiredBufferCount);
+        status_t status = bufferRelease.channel
+                                  ->writeReleaseFence(bufferRelease.callbackId, bufferRelease.fence,
+                                                      bufferRelease.currentMaxAcquiredBufferCount);
+        if (status != OK) {
+            ALOGE("[%s] writeReleaseFence failed. error %d (%s)", bufferRelease.layerName.c_str(),
+                  -status, strerror(-status));
+        }
     }
     mBufferReleases.clear();
 
diff --git a/services/surfaceflinger/TransactionCallbackInvoker.h b/services/surfaceflinger/TransactionCallbackInvoker.h
index d81d8d0..178ddbb 100644
--- a/services/surfaceflinger/TransactionCallbackInvoker.h
+++ b/services/surfaceflinger/TransactionCallbackInvoker.h
@@ -83,6 +83,7 @@
         mCompletedTransactions;
 
     struct BufferRelease {
+        std::string layerName;
         std::shared_ptr<gui::BufferReleaseChannel::ProducerEndpoint> channel;
         ReleaseCallbackId callbackId;
         sp<Fence> fence;
diff --git a/services/surfaceflinger/fuzzer/Android.bp b/services/surfaceflinger/fuzzer/Android.bp
index ae502cf..1de6b4a 100644
--- a/services/surfaceflinger/fuzzer/Android.bp
+++ b/services/surfaceflinger/fuzzer/Android.bp
@@ -28,16 +28,18 @@
 cc_defaults {
     name: "surfaceflinger_fuzz_defaults",
     static_libs: [
-        "libc++fs",
         "libsurfaceflinger_common",
     ],
     srcs: [
+        ":libsurfaceflinger_backend_mock_sources",
+        ":libsurfaceflinger_mock_sources",
         ":libsurfaceflinger_sources",
     ],
     defaults: [
         "libsurfaceflinger_defaults",
     ],
     header_libs: [
+        "libsurfaceflinger_backend_mock_headers",
         "libsurfaceflinger_headers",
     ],
     cflags: [
diff --git a/services/surfaceflinger/tests/tracing/Android.bp b/services/surfaceflinger/tests/tracing/Android.bp
index bce1406..6eb7f4a 100644
--- a/services/surfaceflinger/tests/tracing/Android.bp
+++ b/services/surfaceflinger/tests/tracing/Android.bp
@@ -35,9 +35,6 @@
         ":libsurfaceflinger_mock_sources",
         "TransactionTraceTestSuite.cpp",
     ],
-    static_libs: [
-        "libc++fs",
-    ],
     header_libs: [
         "libsurfaceflinger_mocks_headers",
     ],
diff --git a/services/surfaceflinger/tests/unittests/Android.bp b/services/surfaceflinger/tests/unittests/Android.bp
index 40a6fb8..cb8820a 100644
--- a/services/surfaceflinger/tests/unittests/Android.bp
+++ b/services/surfaceflinger/tests/unittests/Android.bp
@@ -22,15 +22,40 @@
     default_team: "trendy_team_android_core_graphics_stack",
 }
 
+// This is a step towards pulling out the "backend" sources to clean up the
+// dependency graph between CompositionEngine and SurfaceFlinger.
+// MockNativeWindow doesn't strictly belong here, but this works for now so
+// that CompositionEngine tests can use these mocks.
 filegroup {
-    name: "libsurfaceflinger_mock_sources",
+    name: "libsurfaceflinger_backend_mock_sources",
     srcs: [
-        "mock/DisplayHardware/MockPowerHalController.cpp",
         "mock/DisplayHardware/MockComposer.cpp",
         "mock/DisplayHardware/MockHWC2.cpp",
+        "mock/DisplayHardware/MockHWComposer.cpp",
         "mock/DisplayHardware/MockIPower.cpp",
         "mock/DisplayHardware/MockPowerHintSessionWrapper.cpp",
         "mock/DisplayHardware/MockPowerAdvisor.cpp",
+        "mock/DisplayHardware/MockPowerHalController.cpp",
+        "mock/system/window/MockNativeWindow.cpp",
+    ],
+}
+
+cc_library_headers {
+    name: "libsurfaceflinger_backend_mock_headers",
+    export_include_dirs: ["."],
+    static_libs: [
+        "libgmock",
+        "libgtest",
+    ],
+    export_static_lib_headers: [
+        "libgmock",
+        "libgtest",
+    ],
+}
+
+filegroup {
+    name: "libsurfaceflinger_mock_sources",
+    srcs: [
         "mock/MockEventThread.cpp",
         "mock/MockFrameTimeline.cpp",
         "mock/MockFrameTracer.cpp",
@@ -39,7 +64,6 @@
         "mock/MockVsyncController.cpp",
         "mock/MockVSyncDispatch.cpp",
         "mock/MockVSyncTracker.cpp",
-        "mock/system/window/MockNativeWindow.cpp",
     ],
 }
 
@@ -57,9 +81,9 @@
         "surfaceflinger_defaults",
     ],
     test_suites: ["device-tests"],
-    static_libs: ["libc++fs"],
     header_libs: ["surfaceflinger_tests_common_headers"],
     srcs: [
+        ":libsurfaceflinger_backend_mock_sources",
         ":libsurfaceflinger_mock_sources",
         ":libsurfaceflinger_sources",
         "libsurfaceflinger_unittest_main.cpp",
diff --git a/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockHWC2.h b/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockHWC2.h
index 384b908..121104d 100644
--- a/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockHWC2.h
+++ b/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockHWC2.h
@@ -126,6 +126,8 @@
                 (uint32_t, const android::sp<android::GraphicBuffer> &,
                  const android::sp<android::Fence> &),
                 (override));
+    MOCK_METHOD(hal::Error, setBufferSlotsToClear,
+                (const std::vector<uint32_t>& slotsToClear, uint32_t activeBufferSlot), (override));
     MOCK_METHOD(hal::Error, setSurfaceDamage, (const android::Region &), (override));
     MOCK_METHOD(hal::Error, setBlendMode, (hal::BlendMode), (override));
     MOCK_METHOD(hal::Error, setColor, (aidl::android::hardware::graphics::composer3::Color),
diff --git a/services/surfaceflinger/CompositionEngine/tests/MockHWComposer.cpp b/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockHWComposer.cpp
similarity index 81%
rename from services/surfaceflinger/CompositionEngine/tests/MockHWComposer.cpp
rename to services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockHWComposer.cpp
index ae52670..f310633 100644
--- a/services/surfaceflinger/CompositionEngine/tests/MockHWComposer.cpp
+++ b/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockHWComposer.cpp
@@ -16,17 +16,11 @@
 
 #include "MockHWComposer.h"
 
-namespace android {
-
-// This will go away once HWComposer is moved into the "backend" library
-HWComposer::~HWComposer() = default;
-
-namespace mock {
+namespace android::mock {
 
 // The Google Mock documentation recommends explicit non-header instantiations
 // for better compile time performance.
 HWComposer::HWComposer() = default;
 HWComposer::~HWComposer() = default;
 
-} // namespace mock
-} // namespace android
+} // namespace android::mock
diff --git a/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockHWComposer.h b/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockHWComposer.h
new file mode 100644
index 0000000..fa7128c
--- /dev/null
+++ b/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockHWComposer.h
@@ -0,0 +1,153 @@
+/*
+ * Copyright 2024 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.
+ */
+
+#pragma once
+
+#include <gmock/gmock.h>
+
+#include "DisplayHardware/HWComposer.h"
+
+namespace android::mock {
+
+class HWComposer : public android::HWComposer {
+public:
+    using HWDisplayId = android::hardware::graphics::composer::hal::HWDisplayId;
+    using PowerMode = android::hardware::graphics::composer::hal::PowerMode;
+
+    HWComposer();
+    ~HWComposer() override;
+
+    MOCK_METHOD(void, setCallback, (HWC2::ComposerCallback&), (override));
+    MOCK_METHOD(bool, getDisplayIdentificationData,
+                (HWDisplayId, uint8_t*, DisplayIdentificationData*), (const, override));
+    MOCK_METHOD(bool, hasCapability, (aidl::android::hardware::graphics::composer3::Capability),
+                (const, override));
+    MOCK_METHOD(bool, hasDisplayCapability,
+                (HalDisplayId, aidl::android::hardware::graphics::composer3::DisplayCapability),
+                (const, override));
+
+    MOCK_METHOD(size_t, getMaxVirtualDisplayCount, (), (const, override));
+    MOCK_METHOD(size_t, getMaxVirtualDisplayDimension, (), (const, override));
+    MOCK_METHOD(bool, allocateVirtualDisplay, (HalVirtualDisplayId, ui::Size, ui::PixelFormat*),
+                (override));
+    MOCK_METHOD(void, allocatePhysicalDisplay,
+                (hal::HWDisplayId, PhysicalDisplayId, std::optional<ui::Size>), (override));
+
+    MOCK_METHOD(std::shared_ptr<HWC2::Layer>, createLayer, (HalDisplayId), (override));
+    MOCK_METHOD(status_t, getDeviceCompositionChanges,
+                (HalDisplayId, bool, std::optional<std::chrono::steady_clock::time_point>, nsecs_t,
+                 Fps, std::optional<android::HWComposer::DeviceRequestedChanges>*));
+    MOCK_METHOD(status_t, setClientTarget,
+                (HalDisplayId, uint32_t, const sp<Fence>&, const sp<GraphicBuffer>&, ui::Dataspace,
+                 float),
+                (override));
+    MOCK_METHOD(status_t, presentAndGetReleaseFences,
+                (HalDisplayId, std::optional<std::chrono::steady_clock::time_point>), (override));
+    MOCK_METHOD(status_t, executeCommands, (HalDisplayId));
+    MOCK_METHOD(status_t, setPowerMode, (PhysicalDisplayId, PowerMode), (override));
+    MOCK_METHOD(status_t, setColorTransform, (HalDisplayId, const mat4&), (override));
+    MOCK_METHOD(void, disconnectDisplay, (HalDisplayId), (override));
+    MOCK_METHOD(sp<Fence>, getPresentFence, (HalDisplayId), (const, override));
+    MOCK_METHOD(nsecs_t, getPresentTimestamp, (PhysicalDisplayId), (const, override));
+    MOCK_METHOD(sp<Fence>, getLayerReleaseFence, (HalDisplayId, HWC2::Layer*), (const, override));
+    MOCK_METHOD(status_t, setOutputBuffer,
+                (HalVirtualDisplayId, const sp<Fence>&, const sp<GraphicBuffer>&), (override));
+    MOCK_METHOD(void, clearReleaseFences, (HalDisplayId), (override));
+    MOCK_METHOD(status_t, getHdrCapabilities, (HalDisplayId, HdrCapabilities*), (override));
+    MOCK_METHOD(int32_t, getSupportedPerFrameMetadata, (HalDisplayId), (const, override));
+    MOCK_METHOD(std::vector<ui::RenderIntent>, getRenderIntents, (HalDisplayId, ui::ColorMode),
+                (const, override));
+    MOCK_METHOD(mat4, getDataspaceSaturationMatrix, (HalDisplayId, ui::Dataspace), (override));
+    MOCK_METHOD(status_t, getDisplayedContentSamplingAttributes,
+                (HalDisplayId, ui::PixelFormat*, ui::Dataspace*, uint8_t*), (override));
+    MOCK_METHOD(status_t, setDisplayContentSamplingEnabled, (HalDisplayId, bool, uint8_t, uint64_t),
+                (override));
+    MOCK_METHOD(status_t, getDisplayedContentSample,
+                (HalDisplayId, uint64_t, uint64_t, DisplayedFrameStats*), (override));
+    MOCK_METHOD(ftl::Future<status_t>, setDisplayBrightness,
+                (PhysicalDisplayId, float, float, const Hwc2::Composer::DisplayBrightnessOptions&),
+                (override));
+    MOCK_METHOD(std::optional<DisplayIdentificationInfo>, onHotplug,
+                (hal::HWDisplayId, hal::Connection), (override));
+    MOCK_METHOD(bool, updatesDeviceProductInfoOnHotplugReconnect, (), (const, override));
+    MOCK_METHOD(std::optional<PhysicalDisplayId>, onVsync, (hal::HWDisplayId, int64_t));
+    MOCK_METHOD(void, setVsyncEnabled, (PhysicalDisplayId, hal::Vsync), (override));
+    MOCK_METHOD(bool, isConnected, (PhysicalDisplayId), (const, override));
+    MOCK_METHOD(std::vector<HWComposer::HWCDisplayMode>, getModes, (PhysicalDisplayId, int32_t),
+                (const, override));
+    MOCK_METHOD((ftl::Expected<hal::HWConfigId, status_t>), getActiveMode, (PhysicalDisplayId),
+                (const, override));
+    MOCK_METHOD(std::vector<ui::ColorMode>, getColorModes, (PhysicalDisplayId), (const, override));
+    MOCK_METHOD(status_t, setActiveColorMode, (PhysicalDisplayId, ui::ColorMode, ui::RenderIntent),
+                (override));
+    MOCK_METHOD(ui::DisplayConnectionType, getDisplayConnectionType, (PhysicalDisplayId),
+                (const, override));
+    MOCK_METHOD(bool, isVsyncPeriodSwitchSupported, (PhysicalDisplayId), (const, override));
+    MOCK_METHOD((ftl::Expected<nsecs_t, status_t>), getDisplayVsyncPeriod, (PhysicalDisplayId),
+                (const, override));
+    MOCK_METHOD(status_t, setActiveModeWithConstraints,
+                (PhysicalDisplayId, hal::HWConfigId, const hal::VsyncPeriodChangeConstraints&,
+                 hal::VsyncPeriodChangeTimeline*),
+                (override));
+    MOCK_METHOD(status_t, setBootDisplayMode, (PhysicalDisplayId, hal::HWConfigId), (override));
+    MOCK_METHOD(status_t, clearBootDisplayMode, (PhysicalDisplayId), (override));
+    MOCK_METHOD(std::optional<hal::HWConfigId>, getPreferredBootDisplayMode, (PhysicalDisplayId),
+                (override));
+
+    MOCK_METHOD(std::vector<aidl::android::hardware::graphics::common::HdrConversionCapability>,
+                getHdrConversionCapabilities, (), (const, override));
+    MOCK_METHOD(status_t, setHdrConversionStrategy,
+                (aidl::android::hardware::graphics::common::HdrConversionStrategy,
+                 aidl::android::hardware::graphics::common::Hdr*),
+                (override));
+    MOCK_METHOD(status_t, setAutoLowLatencyMode, (PhysicalDisplayId, bool), (override));
+    MOCK_METHOD(status_t, getSupportedContentTypes,
+                (PhysicalDisplayId, std::vector<hal::ContentType>*), (const, override));
+    MOCK_METHOD(status_t, setContentType, (PhysicalDisplayId, hal::ContentType)), (override);
+    MOCK_METHOD((const std::unordered_map<std::string, bool>&), getSupportedLayerGenericMetadata,
+                (), (const, override));
+    MOCK_METHOD(void, dump, (std::string&), (const, override));
+    MOCK_METHOD(void, dumpOverlayProperties, (std::string&), (const, override));
+    MOCK_METHOD(android::Hwc2::Composer*, getComposer, (), (const, override));
+
+    MOCK_METHOD(hal::HWDisplayId, getPrimaryHwcDisplayId, (), (const, override));
+    MOCK_METHOD(PhysicalDisplayId, getPrimaryDisplayId, (), (const, override));
+    MOCK_METHOD(bool, isHeadless, (), (const, override));
+
+    MOCK_METHOD(std::optional<PhysicalDisplayId>, toPhysicalDisplayId, (hal::HWDisplayId),
+                (const, override));
+    MOCK_METHOD(std::optional<hal::HWDisplayId>, fromPhysicalDisplayId, (PhysicalDisplayId),
+                (const, override));
+    MOCK_METHOD(status_t, getDisplayDecorationSupport,
+                (PhysicalDisplayId,
+                 std::optional<aidl::android::hardware::graphics::common::DisplayDecorationSupport>*
+                         support),
+                (override));
+    MOCK_METHOD(status_t, setIdleTimerEnabled, (PhysicalDisplayId, std::chrono::milliseconds),
+                (override));
+    MOCK_METHOD(bool, hasDisplayIdleTimerCapability, (PhysicalDisplayId), (const, override));
+    MOCK_METHOD(Hwc2::AidlTransform, getPhysicalDisplayOrientation, (PhysicalDisplayId),
+                (const, override));
+    MOCK_METHOD(bool, getValidateSkipped, (HalDisplayId), (const, override));
+    MOCK_METHOD(const aidl::android::hardware::graphics::composer3::OverlayProperties&,
+                getOverlaySupport, (), (const, override));
+    MOCK_METHOD(status_t, setRefreshRateChangedCallbackDebugEnabled, (PhysicalDisplayId, bool));
+    MOCK_METHOD(status_t, notifyExpectedPresent, (PhysicalDisplayId, TimePoint, Fps));
+    MOCK_METHOD(HWC2::Display::LutFileDescriptorMapper&, getLutFileDescriptorMapper, (),
+                (override));
+};
+
+} // namespace android::mock
diff --git a/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockIPower.h b/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockIPower.h
index ed1405b..4c034d7 100644
--- a/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockIPower.h
+++ b/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockIPower.h
@@ -32,6 +32,7 @@
 using aidl::android::hardware::power::IPowerHintSession;
 using aidl::android::hardware::power::SessionConfig;
 using aidl::android::hardware::power::SessionTag;
+using aidl::android::hardware::power::SupportInfo;
 
 using aidl::android::hardware::power::Mode;
 using android::binder::Status;
@@ -59,6 +60,7 @@
     MOCK_METHOD(ndk::ScopedAStatus, getSessionChannel,
                 (int32_t tgid, int32_t uid, ChannelConfig* _aidl_return), (override));
     MOCK_METHOD(ndk::ScopedAStatus, closeSessionChannel, (int32_t tgid, int32_t uid), (override));
+    MOCK_METHOD(ndk::ScopedAStatus, getSupportInfo, (SupportInfo * _aidl_return), (override));
     MOCK_METHOD(ndk::ScopedAStatus, getInterfaceVersion, (int32_t * version), (override));
     MOCK_METHOD(ndk::ScopedAStatus, getInterfaceHash, (std::string * hash), (override));
     MOCK_METHOD(ndk::SpAIBinder, asBinder, (), (override));