commit caac147d01566b75c3a8ec0f5d4e8ef577f6ba4e
author Matt Buckley <mattbuckley@google.com> Tue Dec 12 03:55:50 2023 +0000
committer Matt Buckley <mattbuckley@google.com> Thu Dec 14 23:00:22 2023 +0000
tree 36d5389e4f413497debdf1d8bfc5c2fd4ea7b0b0
parent d7ddd9743c2c3054a81de83a5182c6524ff23e61

Add AIDL API for PowerHAL to send session updates with FMQ

This patch adds a set of APIs to PowerHAL to enable hint session
communication via FMQ, to reduce both binder overhead and call latency
moving forward.

Bug: 315894228
Test: atest VtsHalPowerTargetTest
Change-Id: I56f89322c7706ab68e640542caf5b70eef36c451

power/aidl/default/Power.cpp

diff --git a/power/aidl/default/Power.cpp b/power/aidl/default/Power.cpp
index 8fe370c..8f15663 100644
--- a/power/aidl/default/Power.cpp
+++ b/power/aidl/default/Power.cpp
@@ -18,6 +18,8 @@
 #include "PowerHintSession.h"
 
 #include <android-base/logging.h>
+#include <fmq/AidlMessageQueue.h>
+#include <fmq/EventFlag.h>
 
 namespace aidl {
 namespace android {
@@ -27,6 +29,10 @@
 namespace example {
 
 using namespace std::chrono_literals;
+using ::aidl::android::hardware::common::fmq::MQDescriptor;
+using ::aidl::android::hardware::common::fmq::SynchronizedReadWrite;
+using ::aidl::android::hardware::power::ChannelMessage;
+using ::android::AidlMessageQueue;
 
 using ndk::ScopedAStatus;
 
@@ -70,6 +76,27 @@
     return ScopedAStatus::ok();
 }
 
+ndk::ScopedAStatus Power::createHintSessionWithConfig(
+        int32_t tgid, int32_t uid, const std::vector<int32_t>& threadIds, int64_t durationNanos,
+        SessionTag, SessionConfig* config, std::shared_ptr<IPowerHintSession>* _aidl_return) {
+    auto out = createHintSession(tgid, uid, threadIds, durationNanos, _aidl_return);
+    static_cast<PowerHintSession*>(_aidl_return->get())->getSessionConfig(config);
+    return out;
+}
+
+ndk::ScopedAStatus Power::getSessionChannel(int32_t, int32_t, ChannelConfig* _aidl_return) {
+    static AidlMessageQueue<ChannelMessage, SynchronizedReadWrite> stubQueue{1, true};
+    _aidl_return->channelDescriptor = stubQueue.dupeDesc();
+    _aidl_return->readFlagBitmask = 0;
+    _aidl_return->writeFlagBitmask = 0;
+    _aidl_return->eventFlagDescriptor = std::nullopt;
+    return ndk::ScopedAStatus::ok();
+}
+
+ndk::ScopedAStatus Power::closeSessionChannel(int32_t, int32_t) {
+    return ndk::ScopedAStatus::ok();
+}
+
 ScopedAStatus Power::getHintSessionPreferredRate(int64_t* outNanoseconds) {
     *outNanoseconds = std::chrono::nanoseconds(1ms).count();
     return ScopedAStatus::ok();