diff --git a/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/as_gpu.cpp b/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/as_gpu.cpp
index 1c487ef5..5b4d85a9 100644
--- a/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/as_gpu.cpp
+++ b/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/as_gpu.cpp
@@ -22,7 +22,13 @@ namespace skyline::service::nvdrv::device::nvhost {
     }
 
     PosixResult AsGpu::AllocSpace(In<u32> pages, In<u32> pageSize, In<MappingFlags> flags, InOut<u64> offset) {
-        state.logger->Debug("pages: 0x{:X}, pageSize: 0x{:X}, flags: ( fixed: {}, sparse: {} ), offset: 0x{:X}", pages, pageSize, flags.fixed, flags.sparse, offset);
+        state.logger->Debug("pages: 0x{:X}, pageSize: 0x{:X}, flags: ( fixed: {}, sparse: {} ), offset: 0x{:X}",
+                            pages, pageSize, flags.fixed, flags.sparse, offset);
+
+        std::scoped_lock lock(mutex);
+
+        if (!vm.initialised)
+            return PosixResult::InvalidArgument;
 
         if (pageSize != VM::PageSize && pageSize != vm.bigPageSize)
             return PosixResult::InvalidArgument;
@@ -44,7 +50,7 @@ namespace skyline::service::nvdrv::device::nvhost {
         else
             offset = static_cast<u64>(allocator->Allocate(pages)) << pageSizeBits;
 
-        u64 size{static_cast<u64>(pages) * static_cast<u64>(pageSize)};
+        u64 size{static_cast<u64>(pages) * pageSize};
 
         if (flags.sparse)
             state.soc->gm20b.gmmu.Map(offset, GMMU::SparsePlaceholderAddress(), size, true);
@@ -58,14 +64,67 @@ namespace skyline::service::nvdrv::device::nvhost {
         return PosixResult::Success;
     }
 
+    void AsGpu::FreeMappingLocked(u64 offset) {
+        auto mapping{mappingMap.at(offset)};
+
+        if (!mapping->fixed) {
+            auto &allocator{mapping->bigPage ? vm.bigPageAllocator : vm.smallPageAllocator};
+            u32 pageSizeBits{mapping->bigPage ? vm.bigPageSizeBits : VM::PageSizeBits};
+
+            allocator->Free(mapping->offset >> pageSizeBits, mapping->size >> pageSizeBits);
+        }
+
+        // Sparse mappings shouldn't be fully unmapped, just returned to their sparse state
+        // Only FreeSpace can unmap them fully
+        if (mapping->sparseAlloc)
+            state.soc->gm20b.gmmu.Map(offset, GMMU::SparsePlaceholderAddress(), mapping->size, true);
+        else
+            state.soc->gm20b.gmmu.Unmap(offset, mapping->size);
+
+        mappingMap.erase(offset);
+    }
+
     PosixResult AsGpu::FreeSpace(In<u64> offset, In<u32> pages, In<u32> pageSize) {
-        // TODO: implement after UNMAP
+        state.logger->Debug("offset: 0x{:X}, pages: 0x{:X}, pageSize: 0x{:X}", offset, pages, pageSize);
+
+        std::scoped_lock lock(mutex);
+
+        if (!vm.initialised)
+            return PosixResult::InvalidArgument;
+
+        try {
+            auto allocation{allocationMap[offset]};
+
+            if (allocation.pageSize != pageSize || allocation.size != (static_cast<u64>(pages) * pageSize))
+                return PosixResult::InvalidArgument;
+
+            for (const auto &mapping : allocation.mappings)
+                FreeMapping(mapping->offset);
+
+            // Unset sparse flag if required
+            if (allocation.sparse)
+                state.soc->gm20b.gmmu.Unmap(offset, allocation.size);
+
+            auto &allocator{pageSize == VM::PageSize ? vm.smallPageAllocator : vm.bigPageAllocator};
+            u32 pageSizeBits{pageSize == VM::PageSize ? VM::PageSizeBits : vm.bigPageSizeBits};
+
+            allocator->Free(offset >> pageSizeBits, allocation.size >> pageSizeBits);
+            allocationMap.erase(offset);
+        } catch (const std::out_of_range &e) {
+            return PosixResult::InvalidArgument;
+        }
+
         return PosixResult::Success;
     }
 
     PosixResult AsGpu::UnmapBuffer(In<u64> offset) {
         state.logger->Debug("offset: 0x{:X}", offset);
 
+        std::scoped_lock lock(mutex);
+
+        if (!vm.initialised)
+            return PosixResult::InvalidArgument;
+
         try {
             auto mapping{mappingMap.at(offset)};
 
@@ -92,11 +151,13 @@ namespace skyline::service::nvdrv::device::nvhost {
     }
 
     PosixResult AsGpu::MapBufferEx(In<MappingFlags> flags, In<u32> kind, In<core::NvMap::Handle::Id> handle, In<u64> bufferOffset, In<u64> mappingSize, InOut<u64> offset) {
+        state.logger->Debug("flags: ( fixed: {}, remap: {} ), kind: {}, handle: {}, bufferOffset: 0x{:X}, mappingSize: 0x{:X}, offset: 0x{:X}", flags.fixed, flags.remap, kind, handle, bufferOffset, mappingSize, offset);
+
+        std::scoped_lock lock(mutex);
+
         if (!vm.initialised)
             return PosixResult::InvalidArgument;
 
-        state.logger->Debug("flags: ( fixed: {}, remap: {} ), kind: {}, handle: {}, bufferOffset: 0x{:X}, mappingSize: 0x{:X}, offset: 0x{:X}", flags.fixed, flags.remap, kind, handle, bufferOffset, mappingSize, offset);
-
         // Remaps a subregion of an existing mapping to a different PA
         if (flags.remap) {
             try {
@@ -164,6 +225,8 @@ namespace skyline::service::nvdrv::device::nvhost {
     }
 
     PosixResult AsGpu::GetVaRegions(In<u64> bufAddr, InOut<u32> bufSize, Out<std::array<VaRegion, 2>> vaRegions) {
+        std::scoped_lock lock(mutex);
+
         if (!vm.initialised)
             return PosixResult::InvalidArgument;
 
@@ -188,6 +251,8 @@ namespace skyline::service::nvdrv::device::nvhost {
     }
 
     PosixResult AsGpu::AllocAsEx(In<u32> flags, In<FileDescriptor> asFd, In<u32> bigPageSize, In<u64> vaRangeStart, In<u64> vaRangeEnd, In<u64> vaRangeSplit) {
+        std::scoped_lock lock(mutex);
+
         if (vm.initialised)
             throw exception("Cannot initialise an address space twice!");
 
@@ -232,6 +297,11 @@ namespace skyline::service::nvdrv::device::nvhost {
     }
 
     PosixResult AsGpu::Remap(span<RemapEntry> entries) {
+        std::scoped_lock lock(mutex);
+
+        if (!vm.initialised)
+            return PosixResult::InvalidArgument;
+
         for (const auto &entry : entries) {
             u64 virtAddr{static_cast<u64>(entry.asOffsetBigPages) << vm.bigPageSizeBits};
             u64 size{static_cast<u64>(entry.bigPages) << vm.bigPageSizeBits};
diff --git a/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/as_gpu.h b/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/as_gpu.h
index edce48bf..00529fe7 100644
--- a/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/as_gpu.h
+++ b/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/as_gpu.h
@@ -38,9 +38,8 @@ namespace skyline::service::nvdrv::device::nvhost {
         };
 
         std::map<u64, std::shared_ptr<Mapping>> mappingMap; //!< This maps the base addresses of mapped buffers to their total sizes and mapping type, this is needed as what was originally a single buffer may have been split into multiple GPU side buffers with the remap flag.
-
-        std::map<u64, Allocation> allocationMap;
-
+        std::map<u64, Allocation> allocationMap; //!< Holds allocations created by AllocSpace from which fixed buffers can be mapped into
+        std::mutex mutex; //!< Locks all AS operations
 
         struct VM {
             static constexpr u32 PageSize{0x1000};
@@ -66,6 +65,7 @@ namespace skyline::service::nvdrv::device::nvhost {
             bool initialised{};
         } vm;
 
+        void FreeMappingLocked(u64 offset);
 
       public:
         struct MappingFlags {
diff --git a/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/ctrl.cpp b/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/ctrl.cpp
index 45a1ca33..bb1798da 100644
--- a/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/ctrl.cpp
+++ b/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/ctrl.cpp
@@ -70,6 +70,9 @@ namespace skyline::service::nvdrv::device::nvhost {
     }
 
     PosixResult Ctrl::SyncpointWaitEventImpl(In<Fence> fence, In<i32> timeout, InOut<SyncpointEventValue> value, bool allocate) {
+        state.logger->Debug("fence: ( id: {}, threshold: {} ), timeout: {}, value: {}, allocate: {}",
+                            fence.id, fence.threshold, timeout, value.val, allocate);
+
         if (fence.id >= soc::host1x::SyncpointCount)
             return PosixResult::InvalidArgument;
 
@@ -147,6 +150,8 @@ namespace skyline::service::nvdrv::device::nvhost {
     }
 
     PosixResult Ctrl::SyncpointClearEventWait(In<SyncpointEventValue> value) {
+        state.logger->Debug("slot: {}", value.slot);
+
         u16 slot{value.slot};
         if (slot >= SyncpointEventCount)
             return PosixResult::InvalidArgument;
@@ -178,7 +183,7 @@ namespace skyline::service::nvdrv::device::nvhost {
     }
 
     PosixResult Ctrl::SyncpointAllocateEvent(In<u32> slot) {
-        state.logger->Debug("Registering syncpoint event: {}", slot);
+        state.logger->Debug("slot: {}", slot);
 
         if (slot >= SyncpointEventCount)
             return PosixResult::InvalidArgument;
@@ -196,11 +201,15 @@ namespace skyline::service::nvdrv::device::nvhost {
     }
 
     PosixResult Ctrl::SyncpointFreeEvent(In<u32> slot) {
+        state.logger->Debug("slot: {}", slot);
+
         std::lock_guard lock(syncpointEventMutex);
         return SyncpointFreeEventLocked(slot);
     }
 
     PosixResult Ctrl::SyncpointFreeEventBatch(In<u64> bitmask) {
+        state.logger->Debug("bitmask: 0x{:X}", bitmask);
+
         auto err{PosixResult::Success};
 
         // Avoid repeated locks/unlocks by just locking now
diff --git a/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/gpu_channel.cpp b/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/gpu_channel.cpp
index af2b3549..29b652fe 100644
--- a/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/gpu_channel.cpp
+++ b/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/gpu_channel.cpp
@@ -15,14 +15,23 @@ namespace skyline::service::nvdrv::device::nvhost {
     }
 
     PosixResult GpuChannel::SetNvmapFd(In<core::NvMap::Handle::Id> id) {
+        state.logger->Debug("id: {}", id);
         return PosixResult::Success;
     }
 
     PosixResult GpuChannel::SetTimeout(In<u32> timeout) {
+        state.logger->Debug("timeout: {}", timeout);
         return PosixResult::Success;
     }
 
     PosixResult GpuChannel::SubmitGpfifo(In<u64> userAddress, In<u32> numEntries, InOut<SubmitGpfifoFlags> flags, InOut<Fence> fence, span<soc::gm20b::GpEntry> gpEntries) {
+        state.logger->Debug("userAddress: 0x{:X}, numEntries: {},"
+                            "flags ( fenceWait: {}, fenceIncrement: {}, hwFormat: {}, suppressWfi: {}, incrementWithValue: {}),"
+                            "fence ( id: {}, threshold: {} )",
+                            userAddress, numEntries,
+                            +flags.fenceWait, +flags.fenceIncrement, +flags.hwFormat, +flags.suppressWfi, +flags.incrementWithValue,
+                            fence.id, fence.threshold);
+
         if (numEntries > gpEntries.size())
             throw exception("GpEntry size mismatch!");
 
@@ -54,22 +63,27 @@ namespace skyline::service::nvdrv::device::nvhost {
     }
 
     PosixResult GpuChannel::AllocObjCtx(In<u32> classId, In<u32> flags, Out<u64> objId) {
+        state.logger->Debug("classId: 0x{:X}, flags: 0x{:X}", classId, flags);
         return PosixResult::Success;
     }
 
     PosixResult GpuChannel::ZcullBind(In<u64> gpuVa, In<u32> mode) {
+        state.logger->Debug("gpuVa: 0x{:X}, mode: {}", gpuVa, mode);
         return PosixResult::Success;
     }
 
     PosixResult GpuChannel::SetErrorNotifier(In<u64> offset, In<u64> size, In<u32> mem) {
+        state.logger->Debug("offset: 0x{:X}, size: 0x{:X}, mem: 0x{:X}", offset, size, mem);
         return PosixResult::Success;
     }
 
     PosixResult GpuChannel::SetPriority(In<u32> priority) {
+        state.logger->Debug("priority: {}", priority);
         return PosixResult::Success;
     }
 
     PosixResult GpuChannel::AllocGpfifoEx2(In<u32> numEntries, In<u32> numJobs, In<u32> flags, Out<Fence> fence) {
+        state.logger->Debug("numEntries: {}, numJobs: {}, flags: 0x{:X}", numEntries, numJobs, flags);
         state.soc->gm20b.gpfifo.Initialize(numEntries);
 
         fence = core.syncpointManager.GetSyncpointFence(channelSyncpoint);
@@ -78,10 +92,12 @@ namespace skyline::service::nvdrv::device::nvhost {
     }
 
     PosixResult GpuChannel::SetTimeslice(In<u32> timeslice) {
+        state.logger->Debug("timeslice: {}", timeslice);
         return PosixResult::Success;
     }
 
     PosixResult GpuChannel::SetUserData(In<u64> userData) {
+        state.logger->Debug("userData: 0x{:X}", userData);
         channelUserData = userData;
         return PosixResult::Success;
     }
diff --git a/app/src/main/cpp/skyline/services/nvdrv/devices/nvmap.cpp b/app/src/main/cpp/skyline/services/nvdrv/devices/nvmap.cpp
index 586e3e6c..dc80888d 100644
--- a/app/src/main/cpp/skyline/services/nvdrv/devices/nvmap.cpp
+++ b/app/src/main/cpp/skyline/services/nvdrv/devices/nvmap.cpp
@@ -20,6 +20,8 @@ namespace skyline::service::nvdrv::device {
     }
 
     PosixResult NvMap::FromId(In<NvMapCore::Handle::Id> id, Out<NvMapCore::Handle::Id> handle) {
+        state.logger->Debug("id: {}", id);
+
         // Handles and IDs are always the same value in nvmap however IDs can be used globally given the right permissions.
         // Since we don't plan on ever supporting multiprocess we can skip implementing handle refs and so this function
         // just does simple validation and passes through the handle id.
@@ -34,6 +36,8 @@ namespace skyline::service::nvdrv::device {
     }
 
     PosixResult NvMap::Alloc(In<NvMapCore::Handle::Id> handle, In<u32> heapMask, In<NvMapCore::Handle::Flags> flags, InOut<u32> align, In<u8> kind, In<u64> address) {
+        state.logger->Debug("handle: {}, flags: ( mapUncached: {}, keepUncachedAfterFree: {} ), align: 0x{:X}, kind: {}, address: 0x{:X}", handle, flags.mapUncached, flags.keepUncachedAfterFree, align, kind, address);
+
         if (!handle) [[unlikely]]
             return PosixResult::InvalidArgument;
 
@@ -48,12 +52,12 @@ namespace skyline::service::nvdrv::device {
         if (!h) [[unlikely]]
             return PosixResult::InvalidArgument;
 
-        state.logger->Debug("handle: {}, flags: ( mapUncached: {}, keepUncachedAfterFree: {} ), align: 0x{:X}, kind: {}, address: 0x{:X}", handle, flags.mapUncached, flags.keepUncachedAfterFree, align, kind, address);
-
         return h->Alloc(flags, align, kind, address);
     }
 
     PosixResult NvMap::Free(In<NvMapCore::Handle::Id> handle, Out<u64> address, Out<u32> size, Out<NvMapCore::Handle::Flags> flags) {
+        state.logger->Debug("handle: {}", handle);
+
         if (!handle) [[unlikely]]
             return PosixResult::Success;
 
@@ -61,12 +65,16 @@ namespace skyline::service::nvdrv::device {
             address = freeInfo->address;
             size = static_cast<u32>(freeInfo->size);
             flags = NvMapCore::Handle::Flags{ .mapUncached = freeInfo->wasUncached };
+        } else {
+            state.logger->Debug("Handle not freed");
         }
 
         return PosixResult::Success;
     }
 
     PosixResult NvMap::Param(In<NvMapCore::Handle::Id> handle, In<HandleParameterType> param, Out<u32> result) {
+        state.logger->Debug("handle: {}, param: {}", handle, param);
+
         if (!handle)
             return PosixResult::InvalidArgument;
 
@@ -103,6 +111,8 @@ namespace skyline::service::nvdrv::device {
     }
 
     PosixResult NvMap::GetId(Out<NvMapCore::Handle::Id> id, In<NvMapCore::Handle::Id> handle) {
+        state.logger->Debug("handle: {}", handle);
+
         // See the comment in FromId for extra info on this function
         if (!handle) [[unlikely]]
             return PosixResult::InvalidArgument;