[gpu/NVDRV] Unstub SetChannelPriority and adjust ChannelSetTimeSlice (#3017)

Games usually rely on either 1 of this services or both.
The last call adjusts channel_timeslice.
This behavior closely resembles Ryujinx accurate behavior for setting the channel_timeslice accordingly to the situation.

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3017
Reviewed-by: Caio Oliveira <caiooliveirafarias0@gmail.com>
Reviewed-by: crueter <crueter@eden-emu.dev>
Co-authored-by: SDK Chan <sdkchan@eden-emu.dev>
Co-committed-by: SDK Chan <sdkchan@eden-emu.dev>

src/core/hle/service/nvdrv/devices/nvhost_gpu.cpp

@@ -168,7 +168,15 @@ NvResult nvhost_gpu::SetErrorNotifier(IoctlSetErrorNotifier& params) {
 
 NvResult nvhost_gpu::SetChannelPriority(IoctlChannelSetPriority& params) {
     channel_priority = params.priority;
-    LOG_DEBUG(Service_NVDRV, "(STUBBED) called, priority={:X}", channel_priority);
+    LOG_INFO(Service_NVDRV, "called, priority={:X}", channel_priority);
+
+    switch (static_cast<ChannelPriority>(channel_priority)) {
+    case ChannelPriority::Low: channel_timeslice = 1300; break;
+    case ChannelPriority::Medium: channel_timeslice = 2600; break;
+    case ChannelPriority::High: channel_timeslice = 5200; break;
+    default : return NvResult::BadParameter;
+    }
+
     return NvResult::Success;
 }
 
@@ -402,6 +410,10 @@ NvResult nvhost_gpu::ChannelSetTimeout(IoctlChannelSetTimeout& params) {
 NvResult nvhost_gpu::ChannelSetTimeslice(IoctlSetTimeslice& params) {
     LOG_INFO(Service_NVDRV, "called, timeslice={:#X}", params.timeslice);
 
+    if (params.timeslice < 1000 || params.timeslice > 5000) {
+        return NvResult::BadParameter;
+    }
+
     channel_timeslice = params.timeslice;
 
     return NvResult::Success;

src/core/hle/service/nvdrv/devices/nvhost_gpu.h

@@ -66,6 +66,12 @@ private:
         CtxChannelGPFIFO = 0xB06F,
     };
 
+    enum class ChannelPriority : u32 {
+        Low = 0x32,
+        Medium = 0x64,
+        High = 0x96,
+    };
+
     struct IoctlSetNvmapFD {
         s32_le nvmap_fd{};
     };