From 4aef24ba32df2364ce428f93e7e5504faf2061b3 Mon Sep 17 00:00:00 2001
From: Billy Laws <blaws05@gmail.com>
Date: Wed, 31 Aug 2022 15:16:41 +0100
Subject: [PATCH] Implement NVGPU_GPU_IOCTL_GET_GPU_TIME in nvdrv

---
 .../skyline/services/nvdrv/devices/nvhost/ctrl_gpu.cpp    | 8 ++++++++
 .../cpp/skyline/services/nvdrv/devices/nvhost/ctrl_gpu.h  | 5 +++++
 2 files changed, 13 insertions(+)

diff --git a/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/ctrl_gpu.cpp b/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/ctrl_gpu.cpp
index bce3b770..193f3af0 100644
--- a/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/ctrl_gpu.cpp
+++ b/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/ctrl_gpu.cpp
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: MIT OR MPL-2.0
 // Copyright © 2021 Skyline Team and Contributors (https://github.com/skyline-emu/)
 
+#include <common/utils.h>
 #include <services/nvdrv/devices/deserialisation/deserialisation.h>
 #include "ctrl_gpu.h"
 
@@ -55,6 +56,11 @@ namespace skyline::service::nvdrv::device::nvhost {
         return PosixResult::Success;
     }
 
+    PosixResult CtrlGpu::GetGpuTime(Out<u64> time) {
+        time = static_cast<u64>(util::GetTimeNs());
+        return PosixResult::Success;
+    }
+
     std::shared_ptr<type::KEvent> CtrlGpu::QueryEvent(u32 eventId) {
         switch (eventId) {
             case 1:
@@ -82,6 +88,8 @@ namespace skyline::service::nvdrv::device::nvhost {
                         GetTpcMasks,        ARGS(In<u32>, Pad<u32, 3>, Out<u32>))
         IOCTL_CASE_ARGS(OUT,   SIZE(0x8),  MAGIC(CtrlGpuMagic), FUNC(0x14),
                         GetActiveSlotMask,  ARGS(Out<u32>, Out<u32>))
+        IOCTL_CASE_ARGS(INOUT, SIZE(0x10), MAGIC(CtrlGpuMagic), FUNC(0x1C),
+                        GetGpuTime,         ARGS(Out<u64>, Pad<u64>))
     }))
 
     INLINE_IOCTL_HANDLER_FUNC(Ioctl3, CtrlGpu, ({
diff --git a/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/ctrl_gpu.h b/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/ctrl_gpu.h
index 127046fd..52a4f4e2 100644
--- a/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/ctrl_gpu.h
+++ b/app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/ctrl_gpu.h
@@ -123,6 +123,11 @@ namespace skyline::service::nvdrv::device::nvhost {
          */
         PosixResult GetActiveSlotMask(Out<u32> slot, Out<u32> mask);
 
+        /**
+         * @url https://switchbrew.org/wiki/NV_services#NVGPU_GPU_IOCTL_GET_GPU_TIME
+         */
+        PosixResult GetGpuTime(Out<u64> time);
+
         std::shared_ptr<type::KEvent> QueryEvent(u32 eventId) override;
 
         PosixResult Ioctl(IoctlDescriptor cmd, span<u8> buffer) override;