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/*
* Copyright 2022 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 <semaphore.h>
#include <cstdint>
#include <optional>
#include <vector>
#include <LocklessQueue.h>
#include <TransactionState.h>
#include <android-base/thread_annotations.h>
#include <ftl/small_map.h>
#include <ftl/small_vector.h>
namespace android {
class TestableSurfaceFlinger;
namespace surfaceflinger::frontend {
class TransactionHandler {
public:
struct TransactionFlushState {
TransactionState* transaction;
bool firstTransaction = true;
nsecs_t queueProcessTime = 0;
// Layer handles that have transactions with buffers that are ready to be applied.
ftl::SmallMap<IBinder* /* binder address */, uint64_t /* framenumber */, 15>
bufferLayersReadyToPresent = {};
// Tracks the queue with an unsignaled buffer. This is used to handle
// LatchUnsignaledConfig::AutoSingleLayer to ensure we only apply an unsignaled buffer
// if it's the only transaction that is ready to be applied.
sp<IBinder> queueWithUnsignaledBuffer = nullptr;
};
enum class TransactionReadiness {
// Transaction is ready to be applied
Ready,
// Transaction has unmet conditions (fence, present time, etc) and cannot be applied.
NotReady,
// Transaction is waiting on a barrier (another buffer to be latched first)
NotReadyBarrier,
// Transaction has an unsignaled fence but can be applied if it's the only transaction
NotReadyUnsignaled,
};
using TransactionFilter = std::function<TransactionReadiness(const TransactionFlushState&)>;
bool hasPendingTransactions();
// Moves transactions from the lockless queue.
void collectTransactions();
std::vector<TransactionState> flushTransactions();
void addTransactionReadyFilter(TransactionFilter&&);
void queueTransaction(TransactionState&&);
struct StalledTransactionInfo {
pid_t pid;
uint32_t layerId;
std::string layerName;
uint64_t bufferId;
uint64_t frameNumber;
};
void onTransactionQueueStalled(uint64_t transactionId, StalledTransactionInfo);
void removeFromStalledTransactions(uint64_t transactionId);
std::optional<StalledTransactionInfo> getStalledTransactionInfo(pid_t pid);
void onLayerDestroyed(uint32_t layerId);
private:
// For unit tests
friend class ::android::TestableSurfaceFlinger;
int flushPendingTransactionQueues(std::vector<TransactionState>&, TransactionFlushState&);
void applyUnsignaledBufferTransaction(std::vector<TransactionState>&, TransactionFlushState&);
void popTransactionFromPending(std::vector<TransactionState>&, TransactionFlushState&,
std::queue<TransactionState>&);
TransactionReadiness applyFilters(TransactionFlushState&);
std::unordered_map<sp<IBinder>, std::queue<TransactionState>, IListenerHash>
mPendingTransactionQueues;
LocklessQueue<TransactionState> mLocklessTransactionQueue;
std::atomic<size_t> mPendingTransactionCount = 0;
ftl::SmallVector<TransactionFilter, 2> mTransactionReadyFilters;
std::mutex mStalledMutex;
std::unordered_map<uint64_t /* transactionId */, StalledTransactionInfo> mStalledTransactions
GUARDED_BY(mStalledMutex);
};
} // namespace surfaceflinger::frontend
} // namespace android
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