Send power hints from surfaceflinger using the PowerAdvisor

Have SurfaceFlinger send timing hints to the PowerHAL to help meet the frame deadline and dynamically scale clock frequency for different workloads.

This patch additionally refactors a few closely related parts of the PowerAdvisor, and expands the logging there for this feature.

To enable the power hint session, use:
adb shell device_config put surface_flinger_native_boot AdpfFeature__adpf_cpu_hint true

Bug: b/195990840
Test: manual
Change-Id: Ib3eca9d08e0fb5e446ea7075630f741b48940f84

3 files changed, 19 insertions, 0 deletions

diff --git a/libs/renderengine/include/renderengine/RenderEngine.h b/libs/renderengine/include/renderengine/RenderEngine.h
index b9cc6485e5..d646756fc4 100644
--- a/libs/renderengine/include/renderengine/RenderEngine.h
+++ b/libs/renderengine/include/renderengine/RenderEngine.h
@@ -189,6 +189,10 @@ public:
     static void validateInputBufferUsage(const sp<GraphicBuffer>&);
     static void validateOutputBufferUsage(const sp<GraphicBuffer>&);
 
+    // Allows flinger to get the render engine thread id for power management with ADPF
+    // Returns the tid of the renderengine thread if it's threaded, and std::nullopt otherwise
+    virtual std::optional<pid_t> getRenderEngineTid() const { return std::nullopt; }
+
 protected:
     RenderEngine() : RenderEngine(RenderEngineType::GLES) {}
 
diff --git a/libs/renderengine/threaded/RenderEngineThreaded.cpp b/libs/renderengine/threaded/RenderEngineThreaded.cpp
index 08fc81468c..a7176d3279 100644
--- a/libs/renderengine/threaded/RenderEngineThreaded.cpp
+++ b/libs/renderengine/threaded/RenderEngineThreaded.cpp
@@ -389,6 +389,20 @@ void RenderEngineThreaded::onActiveDisplaySizeChanged(ui::Size size) {
     mCondition.notify_one();
 }
 
+std::optional<pid_t> RenderEngineThreaded::getRenderEngineTid() const {
+    std::promise<pid_t> tidPromise;
+    std::future<pid_t> tidFuture = tidPromise.get_future();
+    {
+        std::lock_guard lock(mThreadMutex);
+        mFunctionCalls.push([&tidPromise](renderengine::RenderEngine& instance) {
+            tidPromise.set_value(gettid());
+        });
+    }
+
+    mCondition.notify_one();
+    return std::make_optional(tidFuture.get());
+}
+
 } // namespace threaded
 } // namespace renderengine
 } // namespace android
diff --git a/libs/renderengine/threaded/RenderEngineThreaded.h b/libs/renderengine/threaded/RenderEngineThreaded.h
index 0159cfaece..1ba72ddf81 100644
--- a/libs/renderengine/threaded/RenderEngineThreaded.h
+++ b/libs/renderengine/threaded/RenderEngineThreaded.h
@@ -66,6 +66,7 @@ public:
     int getContextPriority() override;
     bool supportsBackgroundBlur() override;
     void onActiveDisplaySizeChanged(ui::Size size) override;
+    std::optional<pid_t> getRenderEngineTid() const override;
 
 protected:
     void mapExternalTextureBuffer(const sp<GraphicBuffer>& buffer, bool isRenderable) override;