Improve kernel IPC related syscalls (#1379)

* Implement session count decrement when the handle is closed

* Remove unused field

* Implement SendSyncRequestWithUserBuffer, SendAsyncRequestWithUserBuffer and ReplyAndReceiveWithUserBuffer syscalls

* Nits

* Fix swapped copy dst/src

* Add missing pointer buffer descriptor write on reply

* Fix IPC unaligned buffer copy and restoring client attributes on reply

* Oops

* Fix SetIpcMappingPermission

* Fix unaligned copy bugs

* Free memory used for temporary IPC buffers

1 files changed, 31 insertions, 3 deletions

diff --git a/Ryujinx.HLE/HOS/Kernel/Ipc/KClientSession.cs b/Ryujinx.HLE/HOS/Kernel/Ipc/KClientSession.cs
index b99dd1cb..262058d9 100644
--- a/Ryujinx.HLE/HOS/Kernel/Ipc/KClientSession.cs
+++ b/Ryujinx.HLE/HOS/Kernel/Ipc/KClientSession.cs
@@ -13,18 +13,22 @@ namespace Ryujinx.HLE.HOS.Kernel.Ipc
 
         public ChannelState State { get; set; }
 
+        public KClientPort ParentPort { get; }
+
         // TODO: Remove that, we need it for now to allow HLE
         // services implementation to work with the new IPC system.
         public IpcService Service { get; set; }
 
-        public KClientSession(KernelContext context, KSession parent) : base(context)
+        public KClientSession(KernelContext context, KSession parent, KClientPort parentPort) : base(context)
         {
-            _parent = parent;
+            _parent    = parent;
+            ParentPort = parentPort;
+
+            parentPort?.IncrementReferenceCount();
 
             State = ChannelState.Open;
 
             CreatorProcess = context.Scheduler.GetCurrentProcess();
-
             CreatorProcess.IncrementReferenceCount();
         }
 
@@ -51,6 +55,30 @@ namespace Ryujinx.HLE.HOS.Kernel.Ipc
             return result;
         }
 
+        public KernelResult SendAsyncRequest(KWritableEvent asyncEvent, ulong customCmdBuffAddr = 0, ulong customCmdBuffSize = 0)
+        {
+            KThread currentThread = KernelContext.Scheduler.GetCurrentThread();
+
+            KSessionRequest request = new KSessionRequest(currentThread, customCmdBuffAddr, customCmdBuffSize, asyncEvent);
+
+            KernelContext.CriticalSection.Enter();
+
+            KernelResult result = _parent.ServerSession.EnqueueRequest(request);
+
+            KernelContext.CriticalSection.Leave();
+
+            return result;
+        }
+
+        public void DisconnectFromPort()
+        {
+            if (ParentPort != null)
+            {
+                ParentPort.Disconnect();
+                ParentPort.DecrementReferenceCount();
+            }
+        }
+
         protected override void Destroy()
         {
             _parent.DisconnectClient();