diff --git a/libs/gui/ConsumerBase.cpp b/libs/gui/ConsumerBase.cpp
index e772f44..504509d 100644
--- a/libs/gui/ConsumerBase.cpp
+++ b/libs/gui/ConsumerBase.cpp
@@ -37,6 +37,8 @@
 
 #include <private/gui/ComposerService.h>
 
+#include <ui/BufferQueueDefs.h>
+
 #include <log/log.h>
 #include <utils/Log.h>
 #include <utils/String8.h>
@@ -59,7 +61,11 @@
     return android_atomic_inc(&globalCounter);
 }
 
-ConsumerBase::ConsumerBase(const sp<IGraphicBufferConsumer>& bufferQueue, bool controlledByApp) :
+ConsumerBase::ConsumerBase(const sp<IGraphicBufferConsumer>& bufferQueue, bool controlledByApp)
+      :
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+        mSlots(BufferQueueDefs::NUM_BUFFER_SLOTS),
+#endif
         mAbandoned(false),
         mConsumer(bufferQueue),
         mPrevFinalReleaseFence(Fence::NO_FENCE) {
@@ -68,7 +74,12 @@
 
 #if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_CONSUMER_BASE_OWNS_BQ)
 ConsumerBase::ConsumerBase(bool controlledByApp, bool consumerIsSurfaceFlinger)
-      : mAbandoned(false), mPrevFinalReleaseFence(Fence::NO_FENCE) {
+      :
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+        mSlots(BufferQueueDefs::NUM_BUFFER_SLOTS),
+#endif
+        mAbandoned(false),
+        mPrevFinalReleaseFence(Fence::NO_FENCE) {
     sp<IGraphicBufferProducer> producer;
     BufferQueue::createBufferQueue(&producer, &mConsumer, consumerIsSurfaceFlinger);
     mSurface = sp<Surface>::make(producer, controlledByApp);
@@ -77,7 +88,11 @@
 
 ConsumerBase::ConsumerBase(const sp<IGraphicBufferProducer>& producer,
                            const sp<IGraphicBufferConsumer>& consumer, bool controlledByApp)
-      : mAbandoned(false),
+      :
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+        mSlots(BufferQueueDefs::NUM_BUFFER_SLOTS),
+#endif
+        mAbandoned(false),
         mConsumer(consumer),
         mSurface(sp<Surface>::make(producer, controlledByApp)),
         mPrevFinalReleaseFence(Fence::NO_FENCE) {
@@ -101,9 +116,16 @@
     if (err != NO_ERROR) {
         CB_LOGE("ConsumerBase: error connecting to BufferQueue: %s (%d)",
                 strerror(-err), err);
-    } else {
-        mConsumer->setConsumerName(mName);
+        return;
     }
+
+    mConsumer->setConsumerName(mName);
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+    if (err = mConsumer->allowUnlimitedSlots(true); err != NO_ERROR) {
+        CB_LOGE("ConsumerBase: error marking as allowed to have unlimited slots: %s (%d)",
+                strerror(-err), err);
+    }
+#endif
 }
 
 ConsumerBase::~ConsumerBase() {
@@ -130,7 +152,11 @@
     }
 
     uint64_t id = buffer->getId();
-    for (int i = 0; i < BufferQueueDefs::NUM_BUFFER_SLOTS; i++) {
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+    for (int i = 0; i < (int)mSlots.size(); ++i) {
+#else
+    for (int i = 0; i < BufferQueue::NUM_BUFFER_SLOTS; i++) {
+#endif
         auto& slot = mSlots[i];
         if (slot.mGraphicBuffer && slot.mGraphicBuffer->getId() == id) {
             return i;
@@ -242,6 +268,15 @@
         return;
     }
 
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+    std::vector<bool> mask;
+    mConsumer->getReleasedBuffersExtended(&mask);
+    for (size_t i = 0; i < mSlots.size(); i++) {
+        if (mask[i]) {
+            freeBufferLocked(i);
+        }
+    }
+#else
     uint64_t mask = 0;
     mConsumer->getReleasedBuffers(&mask);
     for (int i = 0; i < BufferQueue::NUM_BUFFER_SLOTS; i++) {
@@ -249,6 +284,7 @@
             freeBufferLocked(i);
         }
     }
+#endif
 }
 
 void ConsumerBase::onSidebandStreamChanged() {
@@ -281,7 +317,11 @@
         CB_LOGE("abandonLocked: ConsumerBase is abandoned!");
         return;
     }
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+    for (int i = 0; i < (int)mSlots.size(); ++i) {
+#else
     for (int i =0; i < BufferQueue::NUM_BUFFER_SLOTS; i++) {
+#endif
         freeBufferLocked(i);
     }
     // disconnect from the BufferQueue
@@ -398,6 +438,15 @@
         CB_LOGE("setMaxBufferCount: ConsumerBase is abandoned!");
         return NO_INIT;
     }
+
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+    if (status_t err = mConsumer->allowUnlimitedSlots(false); err != NO_ERROR) {
+        CB_LOGE("ConsumerBase: error marking as not allowed to have unlimited slots: %s (%d)",
+                strerror(-err), err);
+        return err;
+    }
+#endif
+
     return mConsumer->setMaxBufferCount(bufferCount);
 }
 #endif // COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_CONSUMER_BASE_OWNS_BQ)
@@ -459,6 +508,15 @@
     if (err != OK) {
         return err;
     }
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+    std::vector<bool> mask;
+    mConsumer->getReleasedBuffersExtended(&mask);
+    for (int i = 0; i < (int)mSlots.size(); i++) {
+        if (mask[i]) {
+            freeBufferLocked(i);
+        }
+    }
+#else
     uint64_t mask;
     mConsumer->getReleasedBuffers(&mask);
     for (int i = 0; i < BufferQueue::NUM_BUFFER_SLOTS; i++) {
@@ -466,6 +524,8 @@
             freeBufferLocked(i);
         }
     }
+#endif
+
     return OK;
 }
 
@@ -607,6 +667,9 @@
     // buffer on the same slot), the buffer producer is definitely no longer
     // tracking it.
     if (!stillTracking(slot, graphicBuffer)) {
+        CB_LOGV("releaseBufferLocked: Not tracking, exiting without calling releaseBuffer for "
+                "slot=%d/%" PRIu64,
+                slot, mSlots[slot].mFrameNumber);
         return OK;
     }
 
@@ -626,7 +689,11 @@
 
 bool ConsumerBase::stillTracking(int slot,
         const sp<GraphicBuffer> graphicBuffer) {
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+    if (slot < 0 || slot >= (int)mSlots.size()) {
+#else
     if (slot < 0 || slot >= BufferQueue::NUM_BUFFER_SLOTS) {
+#endif
         return false;
     }
     return (mSlots[slot].mGraphicBuffer != nullptr &&
diff --git a/libs/gui/GLConsumer.cpp b/libs/gui/GLConsumer.cpp
index f2173cd..168129b 100644
--- a/libs/gui/GLConsumer.cpp
+++ b/libs/gui/GLConsumer.cpp
@@ -119,6 +119,9 @@
         mTexTarget(texTarget),
         mEglDisplay(EGL_NO_DISPLAY),
         mEglContext(EGL_NO_CONTEXT),
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+        mEglSlots(BufferQueueDefs::NUM_BUFFER_SLOTS),
+#endif
         mCurrentTexture(BufferQueue::INVALID_BUFFER_SLOT),
         mAttached(true) {
     GLC_LOGV("GLConsumer");
@@ -129,27 +132,29 @@
 }
 #endif // COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_CONSUMER_BASE_OWNS_BQ)
 
-GLConsumer::GLConsumer(const sp<IGraphicBufferConsumer>& bq, uint32_t tex,
-        uint32_t texTarget, bool useFenceSync, bool isControlledByApp) :
-    ConsumerBase(bq, isControlledByApp),
-    mCurrentCrop(Rect::EMPTY_RECT),
-    mCurrentTransform(0),
-    mCurrentScalingMode(NATIVE_WINDOW_SCALING_MODE_FREEZE),
-    mCurrentFence(Fence::NO_FENCE),
-    mCurrentTimestamp(0),
-    mCurrentDataSpace(HAL_DATASPACE_UNKNOWN),
-    mCurrentFrameNumber(0),
-    mDefaultWidth(1),
-    mDefaultHeight(1),
-    mFilteringEnabled(true),
-    mTexName(tex),
-    mUseFenceSync(useFenceSync),
-    mTexTarget(texTarget),
-    mEglDisplay(EGL_NO_DISPLAY),
-    mEglContext(EGL_NO_CONTEXT),
-    mCurrentTexture(BufferQueue::INVALID_BUFFER_SLOT),
-    mAttached(true)
-{
+GLConsumer::GLConsumer(const sp<IGraphicBufferConsumer>& bq, uint32_t tex, uint32_t texTarget,
+                       bool useFenceSync, bool isControlledByApp)
+      : ConsumerBase(bq, isControlledByApp),
+        mCurrentCrop(Rect::EMPTY_RECT),
+        mCurrentTransform(0),
+        mCurrentScalingMode(NATIVE_WINDOW_SCALING_MODE_FREEZE),
+        mCurrentFence(Fence::NO_FENCE),
+        mCurrentTimestamp(0),
+        mCurrentDataSpace(HAL_DATASPACE_UNKNOWN),
+        mCurrentFrameNumber(0),
+        mDefaultWidth(1),
+        mDefaultHeight(1),
+        mFilteringEnabled(true),
+        mTexName(tex),
+        mUseFenceSync(useFenceSync),
+        mTexTarget(texTarget),
+        mEglDisplay(EGL_NO_DISPLAY),
+        mEglContext(EGL_NO_CONTEXT),
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+        mEglSlots(BufferQueueDefs::NUM_BUFFER_SLOTS),
+#endif
+        mCurrentTexture(BufferQueue::INVALID_BUFFER_SLOT),
+        mAttached(true) {
     GLC_LOGV("GLConsumer");
 
     memcpy(mCurrentTransformMatrix, mtxIdentity.asArray(),
@@ -176,6 +181,9 @@
         mTexTarget(texTarget),
         mEglDisplay(EGL_NO_DISPLAY),
         mEglContext(EGL_NO_CONTEXT),
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+        mEglSlots(BufferQueueDefs::NUM_BUFFER_SLOTS),
+#endif
         mCurrentTexture(BufferQueue::INVALID_BUFFER_SLOT),
         mAttached(false) {
     GLC_LOGV("GLConsumer");
@@ -204,6 +212,9 @@
         mTexTarget(texTarget),
         mEglDisplay(EGL_NO_DISPLAY),
         mEglContext(EGL_NO_CONTEXT),
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+        mEglSlots(BufferQueueDefs::NUM_BUFFER_SLOTS),
+#endif
         mCurrentTexture(BufferQueue::INVALID_BUFFER_SLOT),
         mAttached(false) {
     GLC_LOGV("GLConsumer");
@@ -395,6 +406,17 @@
     return NO_ERROR;
 }
 
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+void GLConsumer::onSlotCountChanged(int slotCount) {
+    ConsumerBase::onSlotCountChanged(slotCount);
+
+    Mutex::Autolock lock(mMutex);
+    if (slotCount > (int)mEglSlots.size()) {
+        mEglSlots.resize(slotCount);
+    }
+}
+#endif
+
 status_t GLConsumer::releaseBufferLocked(int buf,
         sp<GraphicBuffer> graphicBuffer,
         EGLDisplay display, EGLSyncKHR eglFence) {
diff --git a/libs/gui/IGraphicBufferProducerFlattenables.cpp b/libs/gui/IGraphicBufferProducerFlattenables.cpp
index 4e92a39..8b2e2dd 100644
--- a/libs/gui/IGraphicBufferProducerFlattenables.cpp
+++ b/libs/gui/IGraphicBufferProducerFlattenables.cpp
@@ -128,7 +128,7 @@
 constexpr size_t IGraphicBufferProducer::QueueBufferOutput::minFlattenedSize() {
     return sizeof(width) + sizeof(height) + sizeof(transformHint) + sizeof(numPendingBuffers) +
             sizeof(nextFrameNumber) + sizeof(bufferReplaced) + sizeof(maxBufferCount) +
-            sizeof(result);
+            sizeof(result) + sizeof(isSlotExpansionAllowed);
 }
 size_t IGraphicBufferProducer::QueueBufferOutput::getFlattenedSize() const {
     return minFlattenedSize() + frameTimestamps.getFlattenedSize();
@@ -152,6 +152,7 @@
     FlattenableUtils::write(buffer, size, nextFrameNumber);
     FlattenableUtils::write(buffer, size, bufferReplaced);
     FlattenableUtils::write(buffer, size, maxBufferCount);
+    FlattenableUtils::write(buffer, size, isSlotExpansionAllowed);
 
     status_t result = frameTimestamps.flatten(buffer, size, fds, count);
     if (result != NO_ERROR) {
@@ -175,6 +176,7 @@
     FlattenableUtils::read(buffer, size, nextFrameNumber);
     FlattenableUtils::read(buffer, size, bufferReplaced);
     FlattenableUtils::read(buffer, size, maxBufferCount);
+    FlattenableUtils::read(buffer, size, isSlotExpansionAllowed);
 
     status_t result = frameTimestamps.unflatten(buffer, size, fds, count);
     if (result != NO_ERROR) {
diff --git a/libs/gui/Surface.cpp b/libs/gui/Surface.cpp
index e41f9bb..ec23365 100644
--- a/libs/gui/Surface.cpp
+++ b/libs/gui/Surface.cpp
@@ -38,6 +38,7 @@
 #include <utils/NativeHandle.h>
 #include <utils/Trace.h>
 
+#include <ui/BufferQueueDefs.h>
 #include <ui/DynamicDisplayInfo.h>
 #include <ui/Fence.h>
 #include <ui/GraphicBuffer.h>
@@ -98,7 +99,10 @@
       : mGraphicBufferProducer(bufferProducer),
 #if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_PLATFORM_API_IMPROVEMENTS)
         mSurfaceDeathListener(nullptr),
-#endif // COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_PLATFORM_API_IMPROVEMENTS)
+#endif
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+        mSlots(NUM_BUFFER_SLOTS),
+#endif
         mCrop(Rect::EMPTY_RECT),
         mBufferAge(0),
         mGenerationNumber(0),
@@ -192,7 +196,7 @@
 status_t Surface::allowAllocation(bool allowAllocation) {
     return mGraphicBufferProducer->allowAllocation(allowAllocation);
 }
-#endif // COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_PLATFORM_API_IMPROVEMENTS)
+#endif
 
 status_t Surface::setGenerationNumber(uint32_t generation) {
     status_t result = mGraphicBufferProducer->setGenerationNumber(generation);
@@ -658,7 +662,11 @@
         return result;
     }
 
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+    if (buf < 0 || buf >= (int)mSlots.size()) {
+#else
     if (buf < 0 || buf >= NUM_BUFFER_SLOTS) {
+#endif
         ALOGE("dequeueBuffer: IGraphicBufferProducer returned invalid slot number %d", buf);
         android_errorWriteLog(0x534e4554, "36991414"); // SafetyNet logging
         return FAILED_TRANSACTION;
@@ -757,7 +765,11 @@
     Mutex::Autolock lock(mMutex);
 
     uint64_t bufferId = buffer->getId();
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+    for (int slot = 0; slot < (int)mSlots.size(); ++slot) {
+#else
     for (int slot = 0; slot < Surface::NUM_BUFFER_SLOTS; ++slot) {
+#endif
         auto& bufferSlot = mSlots[slot];
         if (bufferSlot.buffer != nullptr && bufferSlot.buffer->getId() == bufferId) {
             bufferSlot.buffer = nullptr;
@@ -840,7 +852,11 @@
             return output.result;
         }
 
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+        if (output.slot < 0 || output.slot >= (int)mSlots.size()) {
+#else
         if (output.slot < 0 || output.slot >= NUM_BUFFER_SLOTS) {
+#endif
             mGraphicBufferProducer->cancelBuffers(cancelBufferInputs, &cancelBufferOutputs);
             ALOGE("%s: IGraphicBufferProducer returned invalid slot number %d",
                     __FUNCTION__, output.slot);
@@ -1027,7 +1043,11 @@
         return BAD_VALUE;
     }
 
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+    for (int i = 0; i < (int)mSlots.size(); i++) {
+#else
     for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
+#endif
         if (mSlots[i].buffer != nullptr &&
                 mSlots[i].buffer->handle == buffer->handle) {
             return i;
@@ -2094,6 +2114,9 @@
         mDefaultHeight = output.height;
         mNextFrameNumber = output.nextFrameNumber;
         mMaxBufferCount = output.maxBufferCount;
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+        mIsSlotExpansionAllowed = output.isSlotExpansionAllowed;
+#endif
 
         // Ignore transform hint if sticky transform is set or transform to display inverse flag is
         // set. Transform hint should be ignored if the client is expected to always submit buffers
@@ -2190,7 +2213,11 @@
         *outFence = Fence::NO_FENCE;
     }
 
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+    for (int i = 0; i < (int)mSlots.size(); i++) {
+#else
     for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
+#endif
         if (mSlots[i].buffer != nullptr &&
                 mSlots[i].buffer->getId() == buffer->getId()) {
             if (mReportRemovedBuffers) {
@@ -2292,8 +2319,35 @@
     ALOGV("Surface::setMaxDequeuedBufferCount");
     Mutex::Autolock lock(mMutex);
 
-    status_t err = mGraphicBufferProducer->setMaxDequeuedBufferCount(
-            maxDequeuedBuffers);
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+    if (maxDequeuedBuffers > BufferQueueDefs::NUM_BUFFER_SLOTS && !mIsSlotExpansionAllowed) {
+        return BAD_VALUE;
+    }
+
+    int minUndequeuedBuffers = 0;
+    status_t err = mGraphicBufferProducer->query(NATIVE_WINDOW_MIN_UNDEQUEUED_BUFFERS,
+                                                 &minUndequeuedBuffers);
+    if (err != OK) {
+        ALOGE("IGraphicBufferProducer::query(NATIVE_WINDOW_MIN_UNDEQUEUED_BUFFERS) returned %s",
+              strerror(-err));
+        return err;
+    }
+
+    if (maxDequeuedBuffers > (int)mSlots.size()) {
+        int newSlotCount = minUndequeuedBuffers + maxDequeuedBuffers;
+        err = mGraphicBufferProducer->extendSlotCount(newSlotCount);
+        if (err != OK) {
+            ALOGE("IGraphicBufferProducer::extendSlotCount(%d) returned %s", newSlotCount,
+                  strerror(-err));
+            return err;
+        }
+
+        mSlots.resize(newSlotCount);
+    }
+    err = mGraphicBufferProducer->setMaxDequeuedBufferCount(maxDequeuedBuffers);
+#else
+    status_t err = mGraphicBufferProducer->setMaxDequeuedBufferCount(maxDequeuedBuffers);
+#endif
     ALOGE_IF(err, "IGraphicBufferProducer::setMaxDequeuedBufferCount(%d) "
             "returned %s", maxDequeuedBuffers, strerror(-err));
 
@@ -2501,7 +2555,11 @@
         ALOGE("%s: %zu buffers were freed while being dequeued!",
                 __FUNCTION__, mDequeuedSlots.size());
     }
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+    for (int i = 0; i < (int)mSlots.size(); i++) {
+#else
     for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
+#endif
         mSlots[i].buffer = nullptr;
     }
 }
@@ -2510,7 +2568,11 @@
         std::vector<sp<GraphicBuffer>>* outBuffers) {
     ALOGV("Surface::getAndFlushBuffersFromSlots");
     for (int32_t i : slots) {
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+        if (i < 0 || i >= (int)mSlots.size()) {
+#else
         if (i < 0 || i >= NUM_BUFFER_SLOTS) {
+#endif
             ALOGE("%s: Invalid slotIndex: %d", __FUNCTION__, i);
             return BAD_VALUE;
         }
@@ -2670,7 +2732,11 @@
             newDirtyRegion.set(bounds);
             mDirtyRegion.clear();
             Mutex::Autolock lock(mMutex);
-            for (size_t i=0 ; i<NUM_BUFFER_SLOTS ; i++) {
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+            for (int i = 0; i < (int)mSlots.size(); i++) {
+#else
+            for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
+#endif
                 mSlots[i].dirtyRegion.clear();
             }
         }
diff --git a/libs/gui/include/gui/GLConsumer.h b/libs/gui/include/gui/GLConsumer.h
index 8a66dc0..30cbfa2 100644
--- a/libs/gui/include/gui/GLConsumer.h
+++ b/libs/gui/include/gui/GLConsumer.h
@@ -266,6 +266,9 @@
     virtual status_t acquireBufferLocked(BufferItem *item, nsecs_t presentWhen,
             uint64_t maxFrameNumber = 0) override;
 
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+    virtual void onSlotCountChanged(int slotCount) override;
+#endif
     // releaseBufferLocked overrides the ConsumerBase method to update the
     // mEglSlots array in addition to the ConsumerBase.
     virtual status_t releaseBufferLocked(int slot, const sp<GraphicBuffer> graphicBuffer,
@@ -496,8 +499,11 @@
     // slot that has not yet been used. The buffer allocated to a slot will also
     // be replaced if the requested buffer usage or geometry differs from that
     // of the buffer allocated to a slot.
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+    std::vector<EglSlot> mEglSlots;
+#else
     EglSlot mEglSlots[BufferQueueDefs::NUM_BUFFER_SLOTS];
-
+#endif
     // mCurrentTexture is the buffer slot index of the buffer that is currently
     // bound to the OpenGL texture. It is initialized to INVALID_BUFFER_SLOT,
     // indicating that no buffer slot is currently bound to the texture. Note,
diff --git a/libs/gui/include/gui/Surface.h b/libs/gui/include/gui/Surface.h
index 14a3513..755674d 100644
--- a/libs/gui/include/gui/Surface.h
+++ b/libs/gui/include/gui/Surface.h
@@ -558,7 +558,11 @@
     // slot that has not yet been used. The buffer allocated to a slot will also
     // be replaced if the requested buffer usage or geometry differs from that
     // of the buffer allocated to a slot.
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+    std::vector<BufferSlot> mSlots;
+#else
     BufferSlot mSlots[NUM_BUFFER_SLOTS];
+#endif
 
     // mReqWidth is the buffer width that will be requested at the next dequeue
     // operation. It is initialized to 1.
@@ -732,6 +736,10 @@
     std::vector<sp<GraphicBuffer>> mRemovedBuffers;
     int mMaxBufferCount;
 
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+    bool mIsSlotExpansionAllowed;
+#endif
+
     sp<IProducerListener> mListenerProxy;
 
     // Get and flush the buffers of given slots, if the buffer in the slot
diff --git a/libs/gui/tests/BufferItemConsumer_test.cpp b/libs/gui/tests/BufferItemConsumer_test.cpp
index 3b6a66e..6453885 100644
--- a/libs/gui/tests/BufferItemConsumer_test.cpp
+++ b/libs/gui/tests/BufferItemConsumer_test.cpp
@@ -22,8 +22,11 @@
 #include <gui/BufferItemConsumer.h>
 #include <gui/IProducerListener.h>
 #include <gui/Surface.h>
+#include <ui/BufferQueueDefs.h>
 #include <ui/GraphicBuffer.h>
 
+#include <unordered_set>
+
 namespace android {
 
 static constexpr int kWidth = 100;
@@ -57,6 +60,8 @@
     };
 
     void SetUp() override {
+        mBuffers.resize(BufferQueueDefs::NUM_BUFFER_SLOTS);
+
         mBIC = new BufferItemConsumer(kUsage, kMaxLockedBuffers, true);
         String8 name("BufferItemConsumer_Under_Test");
         mBIC->setName(name);
@@ -137,6 +142,11 @@
         ASSERT_EQ(NO_ERROR, ret);
     }
 
+    void DetachBuffer(int slot) {
+        ALOGD("detachBuffer: slot=%d", slot);
+        status_t ret = mBIC->detachBuffer(mBuffers[slot]);
+        ASSERT_EQ(NO_ERROR, ret);
+    }
 
     std::mutex mMutex;
     int mFreedBufferCount{0};
@@ -146,7 +156,7 @@
     sp<BufferFreedListener> mBFL;
     sp<IGraphicBufferProducer> mProducer;
     sp<IGraphicBufferConsumer> mConsumer;
-    sp<GraphicBuffer> mBuffers[BufferQueueDefs::NUM_BUFFER_SLOTS];
+    std::vector<sp<GraphicBuffer>> mBuffers;
 };
 
 // Test that detaching buffer from consumer side triggers onBufferFreed.
@@ -239,4 +249,52 @@
 }
 #endif // COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_PLATFORM_API_IMPROVEMENTS)
 
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+TEST_F(BufferItemConsumerTest, UnlimitedSlots_AcquireReleaseAll) {
+    ASSERT_EQ(OK, mProducer->extendSlotCount(256));
+    mBuffers.resize(256);
+
+    ASSERT_EQ(OK, mProducer->setMaxDequeuedBufferCount(100));
+
+    std::unordered_set<int> slots;
+    for (int i = 0; i < 100; i++) {
+        int slot;
+        DequeueBuffer(&slot);
+        slots.insert(slot);
+    }
+    EXPECT_EQ(100u, slots.size());
+
+    for (int dequeuedSlot : slots) {
+        QueueBuffer(dequeuedSlot);
+
+        int slot;
+        AcquireBuffer(&slot);
+        ReleaseBuffer(slot);
+    }
+}
+
+TEST_F(BufferItemConsumerTest, UnlimitedSlots_AcquireDetachAll) {
+    ASSERT_EQ(OK, mProducer->extendSlotCount(256));
+    mBuffers.resize(256);
+
+    ASSERT_EQ(OK, mProducer->setMaxDequeuedBufferCount(100));
+
+    std::unordered_set<int> slots;
+    for (int i = 0; i < 100; i++) {
+        int slot;
+        DequeueBuffer(&slot);
+        slots.insert(slot);
+    }
+    EXPECT_EQ(100u, slots.size());
+
+    for (int dequeuedSlot : slots) {
+        QueueBuffer(dequeuedSlot);
+
+        int slot;
+        AcquireBuffer(&slot);
+        DetachBuffer(slot);
+    }
+}
+#endif
+
 }  // namespace android
diff --git a/libs/gui/tests/BufferQueue_test.cpp b/libs/gui/tests/BufferQueue_test.cpp
index 6138306..77b4ae8 100644
--- a/libs/gui/tests/BufferQueue_test.cpp
+++ b/libs/gui/tests/BufferQueue_test.cpp
@@ -1669,7 +1669,9 @@
     void setUpConsumer() {
         EXPECT_EQ(OK, mConsumer->consumerConnect(mConsumerListener, false));
 
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
         EXPECT_EQ(OK, mConsumer->allowUnlimitedSlots(true));
+#endif
         EXPECT_EQ(OK, mConsumer->setConsumerUsageBits(GraphicBuffer::USAGE_SW_READ_OFTEN));
         EXPECT_EQ(OK, mConsumer->setDefaultBufferSize(10, 10));
         EXPECT_EQ(OK, mConsumer->setDefaultBufferFormat(PIXEL_FORMAT_RGBA_8888));
@@ -1683,7 +1685,9 @@
         EXPECT_EQ(OK,
                   mProducer->connect(mProducerListener, NATIVE_WINDOW_API_CPU,
                                      /*producerControlledByApp*/ true, &output));
-
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+        ASSERT_TRUE(output.isSlotExpansionAllowed);
+#endif
         ASSERT_EQ(OK, mProducer->setMaxDequeuedBufferCount(kDequeableBufferCount));
         ASSERT_EQ(OK, mProducer->allowAllocation(true));
     }
diff --git a/libs/gui/tests/CpuConsumer_test.cpp b/libs/gui/tests/CpuConsumer_test.cpp
index f4239cb..9476930 100644
--- a/libs/gui/tests/CpuConsumer_test.cpp
+++ b/libs/gui/tests/CpuConsumer_test.cpp
@@ -803,6 +803,27 @@
         ::testing::ValuesIn(rgba8888TestSets));
 #endif
 
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+TEST(CpuConsumerSlotTest, UnlimitedSlots_AcquireReleaseAll) {
+    sp<CpuConsumer> cpuConsumer = sp<CpuConsumer>::make(3);
+    sp<Surface> surface = cpuConsumer->getSurface();
+    sp<SurfaceListener> listener = sp<StubSurfaceListener>::make();
 
+    ASSERT_EQ(OK, surface->connect(NATIVE_WINDOW_API_CPU, listener));
+    ASSERT_EQ(OK, surface->setMaxDequeuedBufferCount(256));
 
+    std::vector<Surface::BatchBuffer> buffers(256);
+    EXPECT_EQ(OK, surface->dequeueBuffers(&buffers));
+
+    for (auto& buffer : buffers) {
+        sp<GraphicBuffer> graphicBuffer = GraphicBuffer::from(buffer.buffer);
+        sp<Fence> fence = sp<Fence>::make(buffer.fenceFd);
+        EXPECT_EQ(OK, surface->queueBuffer(graphicBuffer, fence));
+
+        CpuConsumer::LockedBuffer nativeBuffer;
+        EXPECT_EQ(OK, cpuConsumer->lockNextBuffer(&nativeBuffer));
+        EXPECT_EQ(OK, cpuConsumer->unlockBuffer(nativeBuffer));
+    }
+}
+#endif
 } // namespace android
diff --git a/libs/gui/tests/FillBuffer.cpp b/libs/gui/tests/FillBuffer.cpp
index b60995a..11383d9 100644
--- a/libs/gui/tests/FillBuffer.cpp
+++ b/libs/gui/tests/FillBuffer.cpp
@@ -76,7 +76,7 @@
 }
 
 void fillRGBA8Buffer(uint8_t* buf, int w, int h, int stride) {
-    const size_t PIXEL_SIZE = 4;
+    constexpr size_t PIXEL_SIZE = 4;
     for (int x = 0; x < w; x++) {
         for (int y = 0; y < h; y++) {
             off_t offset = (y * stride + x) * PIXEL_SIZE;
@@ -89,6 +89,21 @@
     }
 }
 
+void fillRGBA8Buffer(uint8_t* buf, int w, int h, int stride, uint8_t r, uint8_t g, uint8_t b,
+                     uint8_t a) {
+    constexpr size_t PIXEL_SIZE = 4;
+
+    for (int x = 0; x < w; x++) {
+        for (int y = 0; y < h; y++) {
+            off_t offset = (y * stride + x) * PIXEL_SIZE;
+            buf[offset] = r;
+            buf[offset + 1] = g;
+            buf[offset + 2] = b;
+            buf[offset + 3] = a;
+        }
+    }
+}
+
 void produceOneRGBA8Frame(const sp<ANativeWindow>& anw) {
     android_native_buffer_t* anb;
     ASSERT_EQ(NO_ERROR, native_window_dequeue_buffer_and_wait(anw.get(),
diff --git a/libs/gui/tests/FillBuffer.h b/libs/gui/tests/FillBuffer.h
index b584179..f5d6b8b 100644
--- a/libs/gui/tests/FillBuffer.h
+++ b/libs/gui/tests/FillBuffer.h
@@ -30,6 +30,8 @@
         const android_native_rect_t& rect);
 
 void fillRGBA8Buffer(uint8_t* buf, int w, int h, int stride);
+void fillRGBA8Buffer(uint8_t* buf, int w, int h, int stride, uint8_t r, uint8_t g, uint8_t b,
+                     uint8_t a);
 
 // Produce a single RGBA8 frame by filling a buffer with a checkerboard pattern
 // using the CPU.  This assumes that the ANativeWindow is already configured to
diff --git a/libs/gui/tests/SurfaceTextureGL_test.cpp b/libs/gui/tests/SurfaceTextureGL_test.cpp
index 449533a..b22b853 100644
--- a/libs/gui/tests/SurfaceTextureGL_test.cpp
+++ b/libs/gui/tests/SurfaceTextureGL_test.cpp
@@ -17,6 +17,8 @@
 #define LOG_TAG "SurfaceTextureGL_test"
 //#define LOG_NDEBUG 0
 
+#include <gmock/gmock.h>
+
 #include "SurfaceTextureGL.h"
 
 #include "DisconnectWaiter.h"
@@ -735,4 +737,30 @@
     ASSERT_NE(NO_ERROR, mST->updateTexImage());
 }
 
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_CONSUMER_BASE_OWNS_BQ)
+TEST_F(SurfaceTextureGLTest, TestUnlimitedSlots) {
+    ASSERT_EQ(OK, mSTC->connect(NATIVE_WINDOW_API_CPU, sp<StubSurfaceListener>::make()));
+    ASSERT_EQ(OK, mSTC->setMaxDequeuedBufferCount(256));
+
+    std::vector<Surface::BatchBuffer> buffers(256);
+    ASSERT_EQ(OK, mSTC->dequeueBuffers(&buffers));
+    ASSERT_EQ(256u, buffers.size());
+    ASSERT_THAT(buffers, Each(Field(&Surface::BatchBuffer::buffer, ::testing::NotNull())));
+
+    for (size_t i = 0; i < buffers.size(); ++i) {
+        sp<GraphicBuffer> graphicBuffer = GraphicBuffer::from(buffers[i].buffer);
+        sp<Fence> fence = sp<Fence>::make(buffers[i].fenceFd);
+
+        void* buf;
+        ASSERT_EQ(OK, graphicBuffer->lock(AHARDWAREBUFFER_USAGE_CPU_WRITE_OFTEN, &buf));
+        fillRGBA8Buffer((uint8_t*)buf, graphicBuffer->getWidth(), graphicBuffer->getHeight(),
+                        graphicBuffer->getStride(), i, i, i, i);
+        graphicBuffer->unlock();
+
+        ASSERT_EQ(OK, mSTC->queueBuffer(graphicBuffer, fence));
+        ASSERT_EQ(OK, mST->updateTexImage());
+        checkPixel(0, 0, i, i, i, i);
+    }
+}
+#endif
 } // namespace android
diff --git a/libs/gui/tests/Surface_test.cpp b/libs/gui/tests/Surface_test.cpp
index 76362ff..e771d6d 100644
--- a/libs/gui/tests/Surface_test.cpp
+++ b/libs/gui/tests/Surface_test.cpp
@@ -14,10 +14,6 @@
  * limitations under the License.
  */
 
-#include "gui/view/Surface.h"
-#include "Constants.h"
-#include "MockConsumer.h"
-
 #include <gtest/gtest.h>
 
 #include <SurfaceFlingerProperties.h>
@@ -36,10 +32,13 @@
 #include <gui/IConsumerListener.h>
 #include <gui/IGraphicBufferConsumer.h>
 #include <gui/IGraphicBufferProducer.h>
+#include <gui/IProducerListener.h>
 #include <gui/ISurfaceComposer.h>
 #include <gui/Surface.h>
 #include <gui/SurfaceComposerClient.h>
 #include <gui/SyncScreenCaptureListener.h>
+#include <gui/view/Surface.h>
+#include <nativebase/nativebase.h>
 #include <private/gui/ComposerService.h>
 #include <private/gui/ComposerServiceAIDL.h>
 #include <sys/types.h>
@@ -47,6 +46,7 @@
 #include <ui/BufferQueueDefs.h>
 #include <ui/DisplayMode.h>
 #include <ui/GraphicBuffer.h>
+#include <ui/PixelFormat.h>
 #include <ui/Rect.h>
 #include <utils/Errors.h>
 #include <utils/String8.h>
@@ -55,9 +55,12 @@
 #include <cstddef>
 #include <cstdint>
 #include <future>
+#include <iterator>
 #include <limits>
 #include <thread>
 
+#include "Constants.h"
+#include "MockConsumer.h"
 #include "testserver/TestServerClient.h"
 
 namespace android {
@@ -2529,4 +2532,128 @@
 }
 #endif // COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_PLATFORM_API_IMPROVEMENTS)
 
+#if COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
+TEST_F(SurfaceTest, UnlimitedSlots_FailsOnIncompatibleConsumer) {
+    sp<IGraphicBufferProducer> producer;
+    sp<IGraphicBufferConsumer> consumer;
+    BufferQueue::createBufferQueue(&producer, &consumer);
+
+    sp<IConsumerListener> consumerListener = sp<FakeConsumer>::make();
+
+    EXPECT_EQ(OK, consumer->allowUnlimitedSlots(false));
+    EXPECT_EQ(OK, consumer->consumerConnect(consumerListener, /* consumerListener */ true));
+
+    sp<Surface> surface = sp<Surface>::make(producer);
+    sp<SurfaceListener> surfaceListener = sp<StubSurfaceListener>::make();
+    EXPECT_EQ(OK, surface->connect(NATIVE_WINDOW_API_CPU, surfaceListener));
+
+    EXPECT_NE(OK, surface->setMaxDequeuedBufferCount(128))
+            << "We shouldn't be able to set high max buffer counts if the consumer doesn't allow "
+               "it";
+}
+
+TEST_F(SurfaceTest, UnlimitedSlots_CanDequeueAndQueueMoreThanOldMaximum) {
+    sp<IGraphicBufferProducer> producer;
+    sp<IGraphicBufferConsumer> consumer;
+    BufferQueue::createBufferQueue(&producer, &consumer);
+
+    sp<IConsumerListener> consumerListener = sp<FakeConsumer>::make();
+
+    EXPECT_EQ(OK, consumer->allowUnlimitedSlots(true));
+    EXPECT_EQ(OK, consumer->consumerConnect(consumerListener, /* consumerListener */ true));
+    EXPECT_EQ(OK, consumer->setDefaultBufferFormat(PIXEL_FORMAT_RGBA_8888));
+    EXPECT_EQ(OK, consumer->setConsumerUsageBits(AHARDWAREBUFFER_USAGE_CPU_WRITE_OFTEN));
+
+    sp<Surface> surface = sp<Surface>::make(producer);
+    sp<SurfaceListener> surfaceListener = sp<StubSurfaceListener>::make();
+    EXPECT_EQ(OK, surface->connect(NATIVE_WINDOW_API_CPU, surfaceListener));
+
+    EXPECT_EQ(OK, surface->setMaxDequeuedBufferCount(128))
+            << "If unlimited slots are allowed, we should be able increase the max dequeued buffer "
+               "count arbitrarily";
+
+    std::vector<std::tuple<sp<GraphicBuffer>, sp<Fence>, int>> buffers;
+    for (int i = 0; i < 128; i++) {
+        sp<GraphicBuffer> buffer;
+        sp<Fence> fence;
+        ASSERT_EQ(OK, surface->dequeueBuffer(&buffer, &fence)) << "Unable to dequeue buffer #" << i;
+        buffers.push_back({buffer, fence, i});
+    }
+
+    for (auto& [buffer, fence, idx] : buffers) {
+        ASSERT_EQ(OK, surface->queueBuffer(buffer, fence)) << "Unable to queue buffer #" << idx;
+    }
+}
+
+TEST_F(SurfaceTest, UnlimitedSlots_CanDequeueAndDetachMoreThanOldMaximum) {
+    sp<IGraphicBufferProducer> producer;
+    sp<IGraphicBufferConsumer> consumer;
+    BufferQueue::createBufferQueue(&producer, &consumer);
+
+    sp<IConsumerListener> consumerListener = sp<FakeConsumer>::make();
+
+    EXPECT_EQ(OK, consumer->allowUnlimitedSlots(true));
+    EXPECT_EQ(OK, consumer->consumerConnect(consumerListener, /* consumerListener */ true));
+    EXPECT_EQ(OK, consumer->setDefaultBufferFormat(PIXEL_FORMAT_RGBA_8888));
+    EXPECT_EQ(OK, consumer->setConsumerUsageBits(AHARDWAREBUFFER_USAGE_CPU_WRITE_OFTEN));
+
+    sp<Surface> surface = sp<Surface>::make(producer);
+    sp<SurfaceListener> surfaceListener = sp<StubSurfaceListener>::make();
+    EXPECT_EQ(OK, surface->connect(NATIVE_WINDOW_API_CPU, surfaceListener));
+
+    EXPECT_EQ(OK, surface->setMaxDequeuedBufferCount(128))
+            << "If unlimited slots are allowed, we should be able increase the max dequeued buffer "
+               "count arbitrarily";
+
+    std::vector<std::tuple<sp<GraphicBuffer>, sp<Fence>, int>> buffers;
+    for (int i = 0; i < 128; i++) {
+        sp<GraphicBuffer> buffer;
+        sp<Fence> fence;
+        ASSERT_EQ(OK, surface->dequeueBuffer(&buffer, &fence)) << "Unable to dequeue buffer #" << i;
+        buffers.push_back({buffer, fence, i});
+    }
+
+    for (auto& [buffer, _, idx] : buffers) {
+        ASSERT_EQ(OK, surface->detachBuffer(buffer)) << "Unable to detach buffer #" << idx;
+    }
+}
+
+TEST_F(SurfaceTest, UnlimitedSlots_BatchOperations) {
+    sp<IGraphicBufferProducer> producer;
+    sp<IGraphicBufferConsumer> consumer;
+    BufferQueue::createBufferQueue(&producer, &consumer);
+
+    sp<IConsumerListener> consumerListener = sp<FakeConsumer>::make();
+
+    EXPECT_EQ(OK, consumer->allowUnlimitedSlots(true));
+    EXPECT_EQ(OK, consumer->consumerConnect(consumerListener, /* consumerListener */ true));
+    EXPECT_EQ(OK, consumer->setDefaultBufferFormat(PIXEL_FORMAT_RGBA_8888));
+    EXPECT_EQ(OK, consumer->setConsumerUsageBits(AHARDWAREBUFFER_USAGE_CPU_WRITE_OFTEN));
+
+    sp<Surface> surface = sp<Surface>::make(producer);
+    sp<SurfaceListener> surfaceListener = sp<StubSurfaceListener>::make();
+    EXPECT_EQ(OK, surface->connect(NATIVE_WINDOW_API_CPU, surfaceListener));
+
+    EXPECT_EQ(OK, surface->setMaxDequeuedBufferCount(128))
+            << "If unlimited slots are allowed, we should be able increase the max dequeued buffer "
+               "count arbitrarily";
+
+    std::vector<Surface::BatchBuffer> buffers(128);
+    EXPECT_EQ(OK, surface->dequeueBuffers(&buffers));
+    EXPECT_EQ(128u, buffers.size());
+
+    std::vector<Surface::BatchQueuedBuffer> queuedBuffers;
+    std::transform(buffers.begin(), buffers.end(), std::back_inserter(queuedBuffers),
+                   [](Surface::BatchBuffer& buffer) {
+                       Surface::BatchQueuedBuffer out;
+                       out.buffer = buffer.buffer;
+                       out.fenceFd = buffer.fenceFd;
+                       return out;
+                   });
+
+    std::vector<SurfaceQueueBufferOutput> outputs;
+    EXPECT_EQ(OK, surface->queueBuffers(queuedBuffers, &outputs));
+    EXPECT_EQ(128u, outputs.size());
+}
+#endif // COM_ANDROID_GRAPHICS_LIBGUI_FLAGS(WB_UNLIMITED_SLOTS)
 } // namespace android