Implement GPU syncpoints (#980)

* Implement GPU syncpoints

This adds support for GPU syncpoints on the GPU backend & nvservices.

Everything that was implemented here is based on my researches,
hardware testing of the GM20B and reversing of nvservices (8.1.0).

Thanks to @fincs for the informations about some behaviours of the pusher
and for the initial informations about syncpoints.

* syncpoint: address gdkchan's comments

* Add some missing logic to handle SubmitGpfifo correctly

* Handle the NV event API correctly

* evnt => hostEvent

* Finish addressing gdkchan's comments

* nvservices: write the output buffer even when an error is returned

* dma pusher: Implemnet prefetch barrier

lso fix when the commands should be prefetch.

* Partially fix prefetch barrier

* Add a missing syncpoint check in QueryEvent of NvHostSyncPt

* Address Ac_K's comments and fix GetSyncpoint for ChannelResourcePolicy == Channel

* fix SyncptWait & SyncptWaitEx cmds logic

* Address ripinperi's comments

* Address gdkchan's comments

* Move user event management to the control channel

* Fix mm implementation, nvdec works again

* Address ripinperi's comments

* Address gdkchan's comments

* Implement nvhost-ctrl close accurately + make nvservices dispose channels when stopping the emulator

* Fix typo in MultiMediaOperationType

1 files changed, 4 insertions, 4 deletions

diff --git a/Ryujinx.Graphics.Gpu/Engine/MethodReport.cs b/Ryujinx.Graphics.Gpu/Engine/MethodReport.cs
index 173989c3..0565acdc 100644
--- a/Ryujinx.Graphics.Gpu/Engine/MethodReport.cs
+++ b/Ryujinx.Graphics.Gpu/Engine/MethodReport.cs
@@ -26,16 +26,16 @@ namespace Ryujinx.Graphics.Gpu.Engine
 
             switch (mode)
             {
-                case ReportMode.Semaphore: ReportSemaphore(state);     break;
-                case ReportMode.Counter:   ReportCounter(state, type); break;
+                case ReportMode.Release: ReleaseSemaphore(state);    break;
+                case ReportMode.Counter: ReportCounter(state, type); break;
             }
         }
 
         /// <summary>
-        /// Writes a GPU semaphore value to guest memory.
+        /// Writes (or Releases) a GPU semaphore value to guest memory.
         /// </summary>
         /// <param name="state">Current GPU state</param>
-        private void ReportSemaphore(GpuState state)
+        private void ReleaseSemaphore(GpuState state)
         {
             var rs = state.Get<ReportState>(MethodOffset.ReportState);