diff --git a/src/core/hle/service/nvdrv/devices/nvhost_gpu.cpp b/src/core/hle/service/nvdrv/devices/nvhost_gpu.cpp
index 7c81068ed8..630ca3c038 100644
--- a/src/core/hle/service/nvdrv/devices/nvhost_gpu.cpp
+++ b/src/core/hle/service/nvdrv/devices/nvhost_gpu.cpp
@@ -75,6 +75,8 @@ NvResult nvhost_gpu::Ioctl1(DeviceFD fd, Ioctl command, std::span<const u8> inpu
             return WrapFixed(this, &nvhost_gpu::SetErrorNotifier, input, output);
         case 0xd:
             return WrapFixed(this, &nvhost_gpu::SetChannelPriority, input, output);
+        case 0x18:
+            return WrapFixed(this, &nvhost_gpu::AllocGPFIFOEx, input, output, fd);
         case 0x1a:
             return WrapFixed(this, &nvhost_gpu::AllocGPFIFOEx2, input, output, fd);
         case 0x1b:
@@ -167,12 +169,36 @@ NvResult nvhost_gpu::SetChannelPriority(IoctlChannelSetPriority& params) {
     return NvResult::Success;
 }
 
-NvResult nvhost_gpu::AllocGPFIFOEx2(IoctlAllocGpfifoEx2& params, DeviceFD fd) {
-    LOG_WARNING(Service_NVDRV,
-                "called, num_entries={:X}, flags={:X}, unk0={:X}, "
-                "unk1={:X}, unk2={:X}, unk3={:X}",
-                params.num_entries, params.flags, params.unk0, params.unk1, params.unk2,
-                params.unk3);
+NvResult nvhost_gpu::AllocGPFIFOEx(IoctlAllocGpfifoEx& params, DeviceFD fd) {
+    LOG_DEBUG(Service_NVDRV,
+              "called, num_entries={:X}, flags={:X}, reserved1={:X}, "
+              "reserved2={:X}, reserved3={:X}",
+              params.num_entries, params.flags, params.reserved[0], params.reserved[1],
+              params.reserved[2]);
+
+    if (channel_state->initialized) {
+        LOG_CRITICAL(Service_NVDRV, "Already allocated!");
+        return NvResult::AlreadyAllocated;
+    }
+
+    u64 program_id{};
+    if (auto* const session = core.GetSession(sessions[fd]); session != nullptr) {
+        program_id = session->process->GetProgramId();
+    }
+
+    system.GPU().InitChannel(*channel_state, program_id);
+
+    params.fence_out = syncpoint_manager.GetSyncpointFence(channel_syncpoint);
+
+    return NvResult::Success;
+}
+
+NvResult nvhost_gpu::AllocGPFIFOEx2(IoctlAllocGpfifoEx& params, DeviceFD fd) {
+    LOG_DEBUG(Service_NVDRV,
+              "called, num_entries={:X}, flags={:X}, reserved1={:X}, "
+              "reserved2={:X}, reserved3={:X}",
+              params.num_entries, params.flags, params.reserved[0], params.reserved[1],
+              params.reserved[2]);
 
     if (channel_state->initialized) {
         LOG_CRITICAL(Service_NVDRV, "Already allocated!");
diff --git a/src/core/hle/service/nvdrv/devices/nvhost_gpu.h b/src/core/hle/service/nvdrv/devices/nvhost_gpu.h
index e0aeef9536..b4ea1e5f60 100644
--- a/src/core/hle/service/nvdrv/devices/nvhost_gpu.h
+++ b/src/core/hle/service/nvdrv/devices/nvhost_gpu.h
@@ -128,27 +128,13 @@ private:
     static_assert(sizeof(NvFence) == 8, "Fence is incorrect size");
 
     struct IoctlAllocGpfifoEx {
-        u32_le num_entries{};
-        u32_le flags{};
-        u32_le unk0{};
-        u32_le unk1{};
-        u32_le unk2{};
-        u32_le unk3{};
-        u32_le unk4{};
-        u32_le unk5{};
-    };
-    static_assert(sizeof(IoctlAllocGpfifoEx) == 32, "IoctlAllocGpfifoEx is incorrect size");
-
-    struct IoctlAllocGpfifoEx2 {
         u32_le num_entries{}; // in
+        u32_le num_jobs{};    // in
         u32_le flags{};       // in
-        u32_le unk0{};        // in (1 works)
         NvFence fence_out{};  // out
-        u32_le unk1{};        // in
-        u32_le unk2{};        // in
-        u32_le unk3{};        // in
+        std::array<u32_le, 3> reserved{};   // in and ingored (for now) according to switch brew
     };
-    static_assert(sizeof(IoctlAllocGpfifoEx2) == 32, "IoctlAllocGpfifoEx2 is incorrect size");
+    static_assert(sizeof(IoctlAllocGpfifoEx) == 32, "IoctlAllocGpfifoEx2 is incorrect size");
 
     struct IoctlAllocObjCtx {
         u32_le class_num{}; // 0x902D=2d, 0xB197=3d, 0xB1C0=compute, 0xA140=kepler, 0xB0B5=DMA,
@@ -192,7 +178,8 @@ private:
     NvResult ZCullBind(IoctlZCullBind& params);
     NvResult SetErrorNotifier(IoctlSetErrorNotifier& params);
     NvResult SetChannelPriority(IoctlChannelSetPriority& params);
-    NvResult AllocGPFIFOEx2(IoctlAllocGpfifoEx2& params, DeviceFD fd);
+    NvResult AllocGPFIFOEx(IoctlAllocGpfifoEx& params, DeviceFD fd);
+    NvResult AllocGPFIFOEx2(IoctlAllocGpfifoEx& params, DeviceFD fd);
     NvResult AllocateObjectContext(IoctlAllocObjCtx& params);
 
     NvResult SubmitGPFIFOImpl(IoctlSubmitGpfifo& params, Tegra::CommandList&& entries);