Merge "[sf] Fix latch unsignaled issues" into udc-dev
diff --git a/services/surfaceflinger/FrontEnd/TransactionHandler.cpp b/services/surfaceflinger/FrontEnd/TransactionHandler.cpp
index 8629671..a209cad 100644
--- a/services/surfaceflinger/FrontEnd/TransactionHandler.cpp
+++ b/services/surfaceflinger/FrontEnd/TransactionHandler.cpp
@@ -64,11 +64,61 @@
transactionsPendingBarrier = flushPendingTransactionQueues(transactions, flushState);
} while (lastTransactionsPendingBarrier != transactionsPendingBarrier);
+ applyUnsignaledBufferTransaction(transactions, flushState);
+
mPendingTransactionCount.fetch_sub(transactions.size());
ATRACE_INT("TransactionQueue", static_cast<int>(mPendingTransactionCount.load()));
return transactions;
}
+void TransactionHandler::applyUnsignaledBufferTransaction(
+ std::vector<TransactionState>& transactions, TransactionFlushState& flushState) {
+ // only apply an unsignaled buffer transaction if it's the first one
+ if (!transactions.empty()) {
+ return;
+ }
+
+ if (!flushState.queueWithUnsignaledBuffer) {
+ return;
+ }
+
+ auto it = mPendingTransactionQueues.find(flushState.queueWithUnsignaledBuffer);
+ LOG_ALWAYS_FATAL_IF(it == mPendingTransactionQueues.end(),
+ "Could not find queue with unsignaled buffer!");
+
+ auto& queue = it->second;
+ popTransactionFromPending(transactions, flushState, queue);
+ if (queue.empty()) {
+ it = mPendingTransactionQueues.erase(it);
+ }
+}
+
+void TransactionHandler::popTransactionFromPending(std::vector<TransactionState>& transactions,
+ TransactionFlushState& flushState,
+ std::queue<TransactionState>& queue) {
+ auto& transaction = queue.front();
+ // Transaction is ready move it from the pending queue.
+ flushState.firstTransaction = false;
+ removeFromStalledTransactions(transaction.id);
+ transactions.emplace_back(std::move(transaction));
+ queue.pop();
+
+ auto& readyToApplyTransaction = transactions.back();
+ readyToApplyTransaction.traverseStatesWithBuffers([&](const layer_state_t& state) {
+ const bool frameNumberChanged =
+ state.bufferData->flags.test(BufferData::BufferDataChange::frameNumberChanged);
+ if (frameNumberChanged) {
+ flushState.bufferLayersReadyToPresent.emplace_or_replace(state.surface.get(),
+ state.bufferData->frameNumber);
+ } else {
+ // Barrier function only used for BBQ which always includes a frame number.
+ // This value only used for barrier logic.
+ flushState.bufferLayersReadyToPresent
+ .emplace_or_replace(state.surface.get(), std::numeric_limits<uint64_t>::max());
+ }
+ });
+}
+
TransactionHandler::TransactionReadiness TransactionHandler::applyFilters(
TransactionFlushState& flushState) {
auto ready = TransactionReadiness::Ready;
@@ -79,8 +129,7 @@
case TransactionReadiness::NotReadyBarrier:
return perFilterReady;
- case TransactionReadiness::ReadyUnsignaled:
- case TransactionReadiness::ReadyUnsignaledSingle:
+ case TransactionReadiness::NotReadyUnsignaled:
// If one of the filters allows latching an unsignaled buffer, latch this ready
// state.
ready = perFilterReady;
@@ -97,17 +146,7 @@
int transactionsPendingBarrier = 0;
auto it = mPendingTransactionQueues.begin();
while (it != mPendingTransactionQueues.end()) {
- auto& queue = it->second;
- IBinder* queueToken = it->first.get();
-
- // if we have already flushed a transaction with an unsignaled buffer then stop queue
- // processing
- if (std::find(flushState.queuesWithUnsignaledBuffers.begin(),
- flushState.queuesWithUnsignaledBuffers.end(),
- queueToken) != flushState.queuesWithUnsignaledBuffers.end()) {
- continue;
- }
-
+ auto& [applyToken, queue] = *it;
while (!queue.empty()) {
auto& transaction = queue.front();
flushState.transaction = &transaction;
@@ -117,38 +156,14 @@
break;
} else if (ready == TransactionReadiness::NotReady) {
break;
- }
-
- // Transaction is ready move it from the pending queue.
- flushState.firstTransaction = false;
- removeFromStalledTransactions(transaction.id);
- transactions.emplace_back(std::move(transaction));
- queue.pop();
-
- // If the buffer is unsignaled, then we don't want to signal other transactions using
- // the buffer as a barrier.
- auto& readyToApplyTransaction = transactions.back();
- if (ready == TransactionReadiness::Ready) {
- readyToApplyTransaction.traverseStatesWithBuffers([&](const layer_state_t& state) {
- const bool frameNumberChanged = state.bufferData->flags.test(
- BufferData::BufferDataChange::frameNumberChanged);
- if (frameNumberChanged) {
- flushState.bufferLayersReadyToPresent
- .emplace_or_replace(state.surface.get(),
- state.bufferData->frameNumber);
- } else {
- // Barrier function only used for BBQ which always includes a frame number.
- // This value only used for barrier logic.
- flushState.bufferLayersReadyToPresent
- .emplace_or_replace(state.surface.get(),
- std::numeric_limits<uint64_t>::max());
- }
- });
- } else if (ready == TransactionReadiness::ReadyUnsignaledSingle) {
- // Track queues with a flushed unsingaled buffer.
- flushState.queuesWithUnsignaledBuffers.emplace_back(queueToken);
+ } else if (ready == TransactionReadiness::NotReadyUnsignaled) {
+ // We maybe able to latch this transaction if it's the only transaction
+ // ready to be applied.
+ flushState.queueWithUnsignaledBuffer = applyToken;
break;
}
+ // ready == TransactionReadiness::Ready
+ popTransactionFromPending(transactions, flushState, queue);
}
if (queue.empty()) {
diff --git a/services/surfaceflinger/FrontEnd/TransactionHandler.h b/services/surfaceflinger/FrontEnd/TransactionHandler.h
index 7fc825e..865835f 100644
--- a/services/surfaceflinger/FrontEnd/TransactionHandler.h
+++ b/services/surfaceflinger/FrontEnd/TransactionHandler.h
@@ -40,14 +40,20 @@
// Layer handles that have transactions with buffers that are ready to be applied.
ftl::SmallMap<IBinder* /* binder address */, uint64_t /* framenumber */, 15>
bufferLayersReadyToPresent = {};
- ftl::SmallVector<IBinder* /* queueToken */, 15> queuesWithUnsignaledBuffers;
+ // 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 {
- NotReady,
- NotReadyBarrier,
+ // Transaction is ready to be applied
Ready,
- ReadyUnsignaled,
- ReadyUnsignaledSingle,
+ // 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&)>;
@@ -64,6 +70,9 @@
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;
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 145fd46..b543467 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -4262,20 +4262,23 @@
return TraverseBuffersReturnValues::STOP_TRAVERSAL;
}
- // check fence status
- const bool allowLatchUnsignaled = shouldLatchUnsignaled(layer, s, transaction.states.size(),
- flushState.firstTransaction);
- ATRACE_FORMAT("%s allowLatchUnsignaled=%s", layer->getName().c_str(),
- allowLatchUnsignaled ? "true" : "false");
-
- const bool acquireFenceChanged = s.bufferData &&
+ // ignore the acquire fence if LatchUnsignaledConfig::Always is set.
+ const bool checkAcquireFence = enableLatchUnsignaledConfig != LatchUnsignaledConfig::Always;
+ const bool acquireFenceAvailable = s.bufferData &&
s.bufferData->flags.test(BufferData::BufferDataChange::fenceChanged) &&
s.bufferData->acquireFence;
- const bool fenceSignaled =
- (!acquireFenceChanged ||
- s.bufferData->acquireFence->getStatus() != Fence::Status::Unsignaled);
+ const bool fenceSignaled = !checkAcquireFence || !acquireFenceAvailable ||
+ s.bufferData->acquireFence->getStatus() != Fence::Status::Unsignaled;
if (!fenceSignaled) {
- if (!allowLatchUnsignaled) {
+ // check fence status
+ const bool allowLatchUnsignaled =
+ shouldLatchUnsignaled(layer, s, transaction.states.size(),
+ flushState.firstTransaction);
+ ATRACE_FORMAT("%s allowLatchUnsignaled=%s", layer->getName().c_str(),
+ allowLatchUnsignaled ? "true" : "false");
+ if (allowLatchUnsignaled) {
+ ready = TransactionReadiness::NotReadyUnsignaled;
+ } else {
ready = TransactionReadiness::NotReady;
auto& listener = s.bufferData->releaseBufferListener;
if (listener &&
@@ -4288,10 +4291,6 @@
}
return TraverseBuffersReturnValues::STOP_TRAVERSAL;
}
-
- ready = enableLatchUnsignaledConfig == LatchUnsignaledConfig::AutoSingleLayer
- ? TransactionReadiness::ReadyUnsignaledSingle
- : TransactionReadiness::ReadyUnsignaled;
}
return TraverseBuffersReturnValues::CONTINUE_TRAVERSAL;
});
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 35707a2..6fa918c 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -174,10 +174,15 @@
// Latch unsignaled is permitted when a single layer is updated in a frame,
// and the update includes just a buffer update (i.e. no sync transactions
// or geometry changes).
+ // Latch unsignaled is also only permitted when a single transaction is ready
+ // to be applied. If we pass an unsignaled fence to HWC, HWC might miss presenting
+ // the frame if the fence does not fire in time. If we apply another transaction,
+ // we may penalize the other transaction unfairly.
AutoSingleLayer,
// All buffers are latched unsignaled. This behaviour is discouraged as it
// can break sync transactions, stall the display and cause undesired side effects.
+ // This is equivalent to ignoring the acquire fence when applying transactions.
Always,
};
diff --git a/services/surfaceflinger/tests/unittests/TransactionApplicationTest.cpp b/services/surfaceflinger/tests/unittests/TransactionApplicationTest.cpp
index d4e2357..03c4e71 100644
--- a/services/surfaceflinger/tests/unittests/TransactionApplicationTest.cpp
+++ b/services/surfaceflinger/tests/unittests/TransactionApplicationTest.cpp
@@ -294,7 +294,8 @@
return fence;
}
- ComposerState createComposerState(int layerId, sp<Fence> fence, uint64_t what) {
+ ComposerState createComposerState(int layerId, sp<Fence> fence, uint64_t what,
+ std::optional<sp<IBinder>> layerHandle = std::nullopt) {
ComposerState state;
state.state.bufferData =
std::make_shared<fake::BufferData>(/* bufferId */ 123L, /* width */ 1,
@@ -302,15 +303,20 @@
/* outUsage */ 0);
state.state.bufferData->acquireFence = std::move(fence);
state.state.layerId = layerId;
- state.state.surface =
+ state.state.surface = layerHandle.value_or(
sp<Layer>::make(LayerCreationArgs(mFlinger.flinger(), nullptr, "TestLayer", 0, {}))
- ->getHandle();
+ ->getHandle());
state.state.bufferData->flags = BufferData::BufferDataChange::fenceChanged;
state.state.what = what;
if (what & layer_state_t::eCropChanged) {
state.state.crop = Rect(1, 2, 3, 4);
}
+ if (what & layer_state_t::eFlagsChanged) {
+ state.state.flags = layer_state_t::eEnableBackpressure;
+ state.state.mask = layer_state_t::eEnableBackpressure;
+ }
+
return state;
}
@@ -601,6 +607,41 @@
setTransactionStates({unsignaledTransaction}, kExpectedTransactionsPending);
}
+TEST_F(LatchUnsignaledAutoSingleLayerTest, UnsignaledNotAppliedWhenThereAreSignaled_SignaledFirst) {
+ const sp<IBinder> kApplyToken1 =
+ IInterface::asBinder(TransactionCompletedListener::getIInstance());
+ const sp<IBinder> kApplyToken2 = sp<BBinder>::make();
+ const sp<IBinder> kApplyToken3 = sp<BBinder>::make();
+ const auto kLayerId1 = 1;
+ const auto kLayerId2 = 2;
+ const auto kExpectedTransactionsPending = 1u;
+
+ const auto signaledTransaction =
+ createTransactionInfo(kApplyToken1,
+ {
+ createComposerState(kLayerId1,
+ fence(Fence::Status::Signaled),
+ layer_state_t::eBufferChanged),
+ });
+ const auto signaledTransaction2 =
+ createTransactionInfo(kApplyToken2,
+ {
+ createComposerState(kLayerId1,
+ fence(Fence::Status::Signaled),
+ layer_state_t::eBufferChanged),
+ });
+ const auto unsignaledTransaction =
+ createTransactionInfo(kApplyToken3,
+ {
+ createComposerState(kLayerId2,
+ fence(Fence::Status::Unsignaled),
+ layer_state_t::eBufferChanged),
+ });
+
+ setTransactionStates({signaledTransaction, signaledTransaction2, unsignaledTransaction},
+ kExpectedTransactionsPending);
+}
+
class LatchUnsignaledDisabledTest : public LatchUnsignaledTest {
public:
void SetUp() override {
@@ -943,6 +984,43 @@
kExpectedTransactionsPending);
}
+TEST_F(LatchUnsignaledAlwaysTest, RespectsBackPressureFlag) {
+ const sp<IBinder> kApplyToken1 =
+ IInterface::asBinder(TransactionCompletedListener::getIInstance());
+ const sp<IBinder> kApplyToken2 = sp<BBinder>::make();
+ const auto kLayerId1 = 1;
+ const auto kExpectedTransactionsPending = 1u;
+ auto layer =
+ sp<Layer>::make(LayerCreationArgs(mFlinger.flinger(), nullptr, "TestLayer", 0, {}));
+ auto layerHandle = layer->getHandle();
+ const auto setBackPressureFlagTransaction =
+ createTransactionInfo(kApplyToken1,
+ {createComposerState(kLayerId1, fence(Fence::Status::Unsignaled),
+ layer_state_t::eBufferChanged |
+ layer_state_t::eFlagsChanged,
+ {layerHandle})});
+ setTransactionStates({setBackPressureFlagTransaction}, 0u);
+
+ const auto unsignaledTransaction =
+ createTransactionInfo(kApplyToken1,
+ {
+ createComposerState(kLayerId1,
+ fence(Fence::Status::Unsignaled),
+ layer_state_t::eBufferChanged,
+ {layerHandle}),
+ });
+ const auto unsignaledTransaction2 =
+ createTransactionInfo(kApplyToken1,
+ {
+ createComposerState(kLayerId1,
+ fence(Fence::Status::Unsignaled),
+ layer_state_t::eBufferChanged,
+ {layerHandle}),
+ });
+ setTransactionStates({unsignaledTransaction, unsignaledTransaction2},
+ kExpectedTransactionsPending);
+}
+
TEST_F(LatchUnsignaledAlwaysTest, LatchUnsignaledWhenEarlyOffset) {
const sp<IBinder> kApplyToken =
IInterface::asBinder(TransactionCompletedListener::getIInstance());