708 lines
28 KiB
C#
708 lines
28 KiB
C#
using Ryujinx.Common.Memory.PartialUnmaps;
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using System;
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using System.Diagnostics;
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using System.Runtime.CompilerServices;
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using System.Runtime.Versioning;
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using System.Threading;
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namespace Ryujinx.Memory.WindowsShared
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{
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/// <summary>
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/// Windows memory placeholder manager.
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/// </summary>
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[SupportedOSPlatform("windows")]
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class PlaceholderManager
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{
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private const int InitialOverlapsSize = 10;
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private readonly MappingTree<ulong> _mappings;
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private readonly MappingTree<MemoryPermission> _protections;
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private readonly IntPtr _partialUnmapStatePtr;
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private readonly Thread _partialUnmapTrimThread;
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/// <summary>
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/// Creates a new instance of the Windows memory placeholder manager.
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/// </summary>
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public PlaceholderManager()
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{
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_mappings = new MappingTree<ulong>();
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_protections = new MappingTree<MemoryPermission>();
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_partialUnmapStatePtr = PartialUnmapState.GlobalState;
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_partialUnmapTrimThread = new Thread(TrimThreadLocalMapLoop);
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_partialUnmapTrimThread.Name = "CPU.PartialUnmapTrimThread";
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_partialUnmapTrimThread.IsBackground = true;
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_partialUnmapTrimThread.Start();
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}
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/// <summary>
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/// Gets a reference to the partial unmap state struct.
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/// </summary>
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/// <returns>A reference to the partial unmap state struct</returns>
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private unsafe ref PartialUnmapState GetPartialUnmapState()
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{
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return ref Unsafe.AsRef<PartialUnmapState>((void*)_partialUnmapStatePtr);
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}
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/// <summary>
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/// Trims inactive threads from the partial unmap state's thread mapping every few seconds.
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/// Should be run in a Background thread so that it doesn't stop the program from closing.
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/// </summary>
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private void TrimThreadLocalMapLoop()
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{
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while (true)
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{
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Thread.Sleep(2000);
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GetPartialUnmapState().TrimThreads();
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}
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}
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/// <summary>
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/// Reserves a range of the address space to be later mapped as shared memory views.
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/// </summary>
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/// <param name="address">Start address of the region to reserve</param>
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/// <param name="size">Size in bytes of the region to reserve</param>
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public void ReserveRange(ulong address, ulong size)
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{
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lock (_mappings)
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{
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_mappings.Add(new RangeNode<ulong>(address, address + size, ulong.MaxValue));
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}
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lock (_protections)
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{
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_protections.Add(new RangeNode<MemoryPermission>(address, size, MemoryPermission.None));
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}
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}
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/// <summary>
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/// Unreserves a range of memory that has been previously reserved with <see cref="ReserveRange"/>.
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/// </summary>
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/// <param name="address">Start address of the region to unreserve</param>
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/// <param name="size">Size in bytes of the region to unreserve</param>
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/// <exception cref="WindowsApiException">Thrown when the Windows API returns an error unreserving the memory</exception>
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public void UnreserveRange(ulong address, ulong size)
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{
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ulong endAddress = address + size;
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lock (_mappings)
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{
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RangeNode<ulong> node = _mappings.GetNode(new RangeNode<ulong>(address, address + 1UL, default));
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for (; node != null; node = node.Successor)
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{
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if (IsMapped(node.Value))
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{
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if (!WindowsApi.UnmapViewOfFile2(WindowsApi.CurrentProcessHandle, (IntPtr)node.Start, 2))
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{
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throw new WindowsApiException("UnmapViewOfFile2");
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}
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}
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_mappings.Remove(node);
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if (node.End >= endAddress)
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{
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break;
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}
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}
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}
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RemoveProtection(address, size);
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}
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/// <summary>
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/// Maps a shared memory view on a previously reserved memory region.
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/// </summary>
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/// <param name="sharedMemory">Shared memory that will be the backing storage for the view</param>
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/// <param name="srcOffset">Offset in the shared memory to map</param>
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/// <param name="location">Address to map the view into</param>
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/// <param name="size">Size of the view in bytes</param>
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/// <param name="owner">Memory block that owns the mapping</param>
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public void MapView(IntPtr sharedMemory, ulong srcOffset, IntPtr location, IntPtr size, MemoryBlock owner)
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{
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ref var partialUnmapLock = ref GetPartialUnmapState().PartialUnmapLock;
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partialUnmapLock.AcquireReaderLock();
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try
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{
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UnmapViewInternal(sharedMemory, location, size, owner, updateProtection: false);
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MapViewInternal(sharedMemory, srcOffset, location, size);
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}
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finally
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{
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partialUnmapLock.ReleaseReaderLock();
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}
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}
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/// <summary>
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/// Maps a shared memory view on a previously reserved memory region.
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/// </summary>
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/// <param name="sharedMemory">Shared memory that will be the backing storage for the view</param>
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/// <param name="srcOffset">Offset in the shared memory to map</param>
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/// <param name="location">Address to map the view into</param>
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/// <param name="size">Size of the view in bytes</param>
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/// <exception cref="WindowsApiException">Thrown when the Windows API returns an error mapping the memory</exception>
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private void MapViewInternal(IntPtr sharedMemory, ulong srcOffset, IntPtr location, IntPtr size)
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{
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SplitForMap((ulong)location, (ulong)size, srcOffset);
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var ptr = WindowsApi.MapViewOfFile3(
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sharedMemory,
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WindowsApi.CurrentProcessHandle,
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location,
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srcOffset,
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size,
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0x4000,
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MemoryProtection.ReadWrite,
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IntPtr.Zero,
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0);
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if (ptr == IntPtr.Zero)
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{
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throw new WindowsApiException("MapViewOfFile3");
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}
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UpdateProtection((ulong)location, (ulong)size, MemoryPermission.ReadAndWrite);
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}
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/// <summary>
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/// Splits a larger placeholder, slicing at the start and end address, for a new memory mapping.
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/// </summary>
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/// <param name="address">Address to split</param>
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/// <param name="size">Size of the new region</param>
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/// <param name="backingOffset">Offset in the shared memory that will be mapped</param>
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private void SplitForMap(ulong address, ulong size, ulong backingOffset)
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{
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ulong endAddress = address + size;
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var overlaps = new RangeNode<ulong>[InitialOverlapsSize];
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lock (_mappings)
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{
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int count = _mappings.GetNodes(address, endAddress, ref overlaps);
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Debug.Assert(count == 1);
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Debug.Assert(!IsMapped(overlaps[0].Value));
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var overlap = overlaps[0];
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ulong overlapStart = overlap.Start;
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ulong overlapEnd = overlap.End;
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ulong overlapValue = overlap.Value;
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_mappings.Remove(overlap);
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bool overlapStartsBefore = overlapStart < address;
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bool overlapEndsAfter = overlapEnd > endAddress;
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if (overlapStartsBefore && overlapEndsAfter)
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{
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CheckFreeResult(WindowsApi.VirtualFree(
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(IntPtr)address,
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(IntPtr)size,
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AllocationType.Release | AllocationType.PreservePlaceholder));
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_mappings.Add(new RangeNode<ulong>(overlapStart, address, overlapValue));
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_mappings.Add(new RangeNode<ulong>(endAddress, overlapEnd, AddBackingOffset(overlapValue, endAddress - overlapStart)));
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}
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else if (overlapStartsBefore)
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{
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ulong overlappedSize = overlapEnd - address;
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CheckFreeResult(WindowsApi.VirtualFree(
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(IntPtr)address,
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(IntPtr)overlappedSize,
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AllocationType.Release | AllocationType.PreservePlaceholder));
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_mappings.Add(new RangeNode<ulong>(overlapStart, address, overlapValue));
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}
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else if (overlapEndsAfter)
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{
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ulong overlappedSize = endAddress - overlapStart;
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CheckFreeResult(WindowsApi.VirtualFree(
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(IntPtr)overlapStart,
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(IntPtr)overlappedSize,
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AllocationType.Release | AllocationType.PreservePlaceholder));
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_mappings.Add(new RangeNode<ulong>(endAddress, overlapEnd, AddBackingOffset(overlapValue, overlappedSize)));
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}
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_mappings.Add(new RangeNode<ulong>(address, endAddress, backingOffset));
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}
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}
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/// <summary>
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/// Unmaps a view that has been previously mapped with <see cref="MapView"/>.
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/// </summary>
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/// <remarks>
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/// For "partial unmaps" (when not the entire mapped range is being unmapped), it might be
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/// necessary to unmap the whole range and then remap the sub-ranges that should remain mapped.
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/// </remarks>
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/// <param name="sharedMemory">Shared memory that the view being unmapped belongs to</param>
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/// <param name="location">Address to unmap</param>
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/// <param name="size">Size of the region to unmap in bytes</param>
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/// <param name="owner">Memory block that owns the mapping</param>
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public void UnmapView(IntPtr sharedMemory, IntPtr location, IntPtr size, MemoryBlock owner)
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{
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ref var partialUnmapLock = ref GetPartialUnmapState().PartialUnmapLock;
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partialUnmapLock.AcquireReaderLock();
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try
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{
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UnmapViewInternal(sharedMemory, location, size, owner, updateProtection: true);
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}
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finally
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{
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partialUnmapLock.ReleaseReaderLock();
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}
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}
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/// <summary>
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/// Unmaps a view that has been previously mapped with <see cref="MapView"/>.
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/// </summary>
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/// <remarks>
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/// For "partial unmaps" (when not the entire mapped range is being unmapped), it might be
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/// necessary to unmap the whole range and then remap the sub-ranges that should remain mapped.
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/// </remarks>
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/// <param name="sharedMemory">Shared memory that the view being unmapped belongs to</param>
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/// <param name="location">Address to unmap</param>
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/// <param name="size">Size of the region to unmap in bytes</param>
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/// <param name="owner">Memory block that owns the mapping</param>
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/// <param name="updateProtection">Indicates if the memory protections should be updated after the unmap</param>
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/// <exception cref="WindowsApiException">Thrown when the Windows API returns an error unmapping or remapping the memory</exception>
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private void UnmapViewInternal(IntPtr sharedMemory, IntPtr location, IntPtr size, MemoryBlock owner, bool updateProtection)
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{
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ulong startAddress = (ulong)location;
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ulong unmapSize = (ulong)size;
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ulong endAddress = startAddress + unmapSize;
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var overlaps = new RangeNode<ulong>[InitialOverlapsSize];
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int count;
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lock (_mappings)
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{
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count = _mappings.GetNodes(startAddress, endAddress, ref overlaps);
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}
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for (int index = 0; index < count; index++)
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{
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var overlap = overlaps[index];
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if (IsMapped(overlap.Value))
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{
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lock (_mappings)
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{
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_mappings.Remove(overlap);
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_mappings.Add(new RangeNode<ulong>(overlap.Start, overlap.End, ulong.MaxValue));
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}
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bool overlapStartsBefore = overlap.Start < startAddress;
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bool overlapEndsAfter = overlap.End > endAddress;
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if (overlapStartsBefore || overlapEndsAfter)
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{
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// If the overlap extends beyond the region we are unmapping,
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// then we need to re-map the regions that are supposed to remain mapped.
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// This is necessary because Windows does not support partial view unmaps.
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// That is, you can only fully unmap a view that was previously mapped, you can't just unmap a chunck of it.
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ref var partialUnmapState = ref GetPartialUnmapState();
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ref var partialUnmapLock = ref partialUnmapState.PartialUnmapLock;
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partialUnmapLock.UpgradeToWriterLock();
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try
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{
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partialUnmapState.PartialUnmapsCount++;
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if (!WindowsApi.UnmapViewOfFile2(WindowsApi.CurrentProcessHandle, (IntPtr)overlap.Start, 2))
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{
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throw new WindowsApiException("UnmapViewOfFile2");
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}
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if (overlapStartsBefore)
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{
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ulong remapSize = startAddress - overlap.Start;
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MapViewInternal(sharedMemory, overlap.Value, (IntPtr)overlap.Start, (IntPtr)remapSize);
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RestoreRangeProtection(overlap.Start, remapSize);
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}
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if (overlapEndsAfter)
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{
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ulong overlappedSize = endAddress - overlap.Start;
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ulong remapBackingOffset = overlap.Value + overlappedSize;
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ulong remapAddress = overlap.Start + overlappedSize;
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ulong remapSize = overlap.End - endAddress;
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MapViewInternal(sharedMemory, remapBackingOffset, (IntPtr)remapAddress, (IntPtr)remapSize);
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RestoreRangeProtection(remapAddress, remapSize);
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}
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}
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finally
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{
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partialUnmapLock.DowngradeFromWriterLock();
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}
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}
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else if (!WindowsApi.UnmapViewOfFile2(WindowsApi.CurrentProcessHandle, (IntPtr)overlap.Start, 2))
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{
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throw new WindowsApiException("UnmapViewOfFile2");
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}
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}
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}
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CoalesceForUnmap(startAddress, unmapSize, owner);
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if (updateProtection)
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{
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UpdateProtection(startAddress, unmapSize, MemoryPermission.None);
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}
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}
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/// <summary>
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/// Coalesces adjacent placeholders after unmap.
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/// </summary>
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/// <param name="address">Address of the region that was unmapped</param>
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/// <param name="size">Size of the region that was unmapped in bytes</param>
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/// <param name="owner">Memory block that owns the mapping</param>
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private void CoalesceForUnmap(ulong address, ulong size, MemoryBlock owner)
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{
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ulong endAddress = address + size;
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ulong blockAddress = (ulong)owner.Pointer;
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ulong blockEnd = blockAddress + owner.Size;
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var overlaps = new RangeNode<ulong>[InitialOverlapsSize];
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int unmappedCount = 0;
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lock (_mappings)
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{
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int count = _mappings.GetNodes(address, endAddress, ref overlaps);
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if (count == 0)
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{
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// Nothing to coalesce if we no overlaps.
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return;
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}
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RangeNode<ulong> predecessor = overlaps[0].Predecessor;
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RangeNode<ulong> successor = overlaps[count - 1].Successor;
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for (int index = 0; index < count; index++)
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{
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var overlap = overlaps[index];
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if (!IsMapped(overlap.Value))
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{
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address = Math.Min(address, overlap.Start);
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endAddress = Math.Max(endAddress, overlap.End);
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_mappings.Remove(overlap);
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unmappedCount++;
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}
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}
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if (predecessor != null && !IsMapped(predecessor.Value) && predecessor.Start >= blockAddress)
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{
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address = Math.Min(address, predecessor.Start);
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_mappings.Remove(predecessor);
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unmappedCount++;
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}
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if (successor != null && !IsMapped(successor.Value) && successor.End <= blockEnd)
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{
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endAddress = Math.Max(endAddress, successor.End);
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_mappings.Remove(successor);
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unmappedCount++;
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}
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_mappings.Add(new RangeNode<ulong>(address, endAddress, ulong.MaxValue));
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}
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if (unmappedCount > 1)
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{
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size = endAddress - address;
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CheckFreeResult(WindowsApi.VirtualFree(
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(IntPtr)address,
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(IntPtr)size,
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AllocationType.Release | AllocationType.CoalescePlaceholders));
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}
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}
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/// <summary>
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/// Reprotects a region of memory that has been mapped.
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/// </summary>
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/// <param name="address">Address of the region to reprotect</param>
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/// <param name="size">Size of the region to reprotect in bytes</param>
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/// <param name="permission">New permissions</param>
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/// <returns>True if the reprotection was successful, false otherwise</returns>
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public bool ReprotectView(IntPtr address, IntPtr size, MemoryPermission permission)
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{
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ref var partialUnmapLock = ref GetPartialUnmapState().PartialUnmapLock;
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partialUnmapLock.AcquireReaderLock();
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try
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{
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return ReprotectViewInternal(address, size, permission, false);
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}
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finally
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{
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partialUnmapLock.ReleaseReaderLock();
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}
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}
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/// <summary>
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/// Reprotects a region of memory that has been mapped.
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/// </summary>
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/// <param name="address">Address of the region to reprotect</param>
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/// <param name="size">Size of the region to reprotect in bytes</param>
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/// <param name="permission">New permissions</param>
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/// <param name="throwOnError">Throw an exception instead of returning an error if the operation fails</param>
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/// <returns>True if the reprotection was successful or if <paramref name="throwOnError"/> is true, false otherwise</returns>
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/// <exception cref="WindowsApiException">If <paramref name="throwOnError"/> is true, it is thrown when the Windows API returns an error reprotecting the memory</exception>
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private bool ReprotectViewInternal(IntPtr address, IntPtr size, MemoryPermission permission, bool throwOnError)
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{
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ulong reprotectAddress = (ulong)address;
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ulong reprotectSize = (ulong)size;
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ulong endAddress = reprotectAddress + reprotectSize;
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var overlaps = new RangeNode<ulong>[InitialOverlapsSize];
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int count;
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lock (_mappings)
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{
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count = _mappings.GetNodes(reprotectAddress, endAddress, ref overlaps);
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}
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bool success = true;
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for (int index = 0; index < count; index++)
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{
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var overlap = overlaps[index];
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ulong mappedAddress = overlap.Start;
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ulong mappedSize = overlap.End - overlap.Start;
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if (mappedAddress < reprotectAddress)
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{
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ulong delta = reprotectAddress - mappedAddress;
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mappedAddress = reprotectAddress;
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mappedSize -= delta;
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}
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ulong mappedEndAddress = mappedAddress + mappedSize;
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if (mappedEndAddress > endAddress)
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{
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ulong delta = mappedEndAddress - endAddress;
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mappedSize -= delta;
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}
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if (!WindowsApi.VirtualProtect((IntPtr)mappedAddress, (IntPtr)mappedSize, WindowsApi.GetProtection(permission), out _))
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{
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if (throwOnError)
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{
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throw new WindowsApiException("VirtualProtect");
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}
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success = false;
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}
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}
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UpdateProtection(reprotectAddress, reprotectSize, permission);
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return success;
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}
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/// <summary>
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/// Checks the result of a VirtualFree operation, throwing if needed.
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/// </summary>
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/// <param name="success">Operation result</param>
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/// <exception cref="WindowsApiException">Thrown if <paramref name="success"/> is false</exception>
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private static void CheckFreeResult(bool success)
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{
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if (!success)
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{
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throw new WindowsApiException("VirtualFree");
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}
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}
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/// <summary>
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/// Adds an offset to a backing offset. This will do nothing if the backing offset is the special "unmapped" value.
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/// </summary>
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/// <param name="backingOffset">Backing offset</param>
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/// <param name="offset">Offset to be added</param>
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/// <returns>Added offset or just <paramref name="backingOffset"/> if the region is unmapped</returns>
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private static ulong AddBackingOffset(ulong backingOffset, ulong offset)
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{
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if (backingOffset == ulong.MaxValue)
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{
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return backingOffset;
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}
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return backingOffset + offset;
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}
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/// <summary>
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/// Checks if a region is unmapped.
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/// </summary>
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/// <param name="backingOffset">Backing offset to check</param>
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/// <returns>True if the backing offset is the special "unmapped" value, false otherwise</returns>
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private static bool IsMapped(ulong backingOffset)
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{
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return backingOffset != ulong.MaxValue;
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}
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/// <summary>
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/// Adds a protection to the list of protections.
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/// </summary>
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/// <param name="address">Address of the protected region</param>
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/// <param name="size">Size of the protected region in bytes</param>
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/// <param name="permission">Memory permissions of the region</param>
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private void UpdateProtection(ulong address, ulong size, MemoryPermission permission)
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{
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ulong endAddress = address + size;
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var overlaps = new RangeNode<MemoryPermission>[InitialOverlapsSize];
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int count;
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lock (_protections)
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{
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count = _protections.GetNodes(address, endAddress, ref overlaps);
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if (count == 1 &&
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overlaps[0].Start <= address &&
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overlaps[0].End >= endAddress &&
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overlaps[0].Value == permission)
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{
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return;
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}
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ulong startAddress = address;
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for (int index = 0; index < count; index++)
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{
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var protection = overlaps[index];
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ulong protAddress = protection.Start;
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ulong protEndAddress = protection.End;
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MemoryPermission protPermission = protection.Value;
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_protections.Remove(protection);
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if (protection.Value == permission)
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{
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if (startAddress > protAddress)
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{
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startAddress = protAddress;
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}
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if (endAddress < protEndAddress)
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{
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endAddress = protEndAddress;
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}
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}
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else
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{
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if (startAddress > protAddress)
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{
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_protections.Add(new RangeNode<MemoryPermission>(protAddress, startAddress, protPermission));
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}
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if (endAddress < protEndAddress)
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{
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_protections.Add(new RangeNode<MemoryPermission>(endAddress, protEndAddress, protPermission));
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}
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}
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}
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_protections.Add(new RangeNode<MemoryPermission>(startAddress, endAddress, permission));
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}
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}
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/// <summary>
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/// Removes protection from the list of protections.
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/// </summary>
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/// <param name="address">Address of the protected region</param>
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/// <param name="size">Size of the protected region in bytes</param>
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private void RemoveProtection(ulong address, ulong size)
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|
{
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ulong endAddress = address + size;
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var overlaps = new RangeNode<MemoryPermission>[InitialOverlapsSize];
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|
int count;
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lock (_protections)
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|
{
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count = _protections.GetNodes(address, endAddress, ref overlaps);
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|
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|
for (int index = 0; index < count; index++)
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|
{
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var protection = overlaps[index];
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ulong protAddress = protection.Start;
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ulong protEndAddress = protection.End;
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MemoryPermission protPermission = protection.Value;
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_protections.Remove(protection);
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if (address > protAddress)
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{
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|
_protections.Add(new RangeNode<MemoryPermission>(protAddress, address, protPermission));
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}
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|
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if (endAddress < protEndAddress)
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|
{
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|
_protections.Add(new RangeNode<MemoryPermission>(endAddress, protEndAddress, protPermission));
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|
}
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|
}
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|
}
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|
}
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|
/// <summary>
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|
/// Restores the protection of a given memory region that was remapped, using the protections list.
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|
/// </summary>
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|
/// <param name="address">Address of the remapped region</param>
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|
/// <param name="size">Size of the remapped region in bytes</param>
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|
private void RestoreRangeProtection(ulong address, ulong size)
|
|
{
|
|
ulong endAddress = address + size;
|
|
var overlaps = new RangeNode<MemoryPermission>[InitialOverlapsSize];
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|
int count;
|
|
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|
lock (_protections)
|
|
{
|
|
count = _protections.GetNodes(address, endAddress, ref overlaps);
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|
}
|
|
|
|
ulong startAddress = address;
|
|
|
|
for (int index = 0; index < count; index++)
|
|
{
|
|
var protection = overlaps[index];
|
|
|
|
// If protection is R/W we don't need to reprotect as views are initially mapped as R/W.
|
|
if (protection.Value == MemoryPermission.ReadAndWrite)
|
|
{
|
|
continue;
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|
}
|
|
|
|
ulong protAddress = protection.Start;
|
|
ulong protEndAddress = protection.End;
|
|
|
|
if (protAddress < address)
|
|
{
|
|
protAddress = address;
|
|
}
|
|
|
|
if (protEndAddress > endAddress)
|
|
{
|
|
protEndAddress = endAddress;
|
|
}
|
|
|
|
ReprotectViewInternal((IntPtr)protAddress, (IntPtr)(protEndAddress - protAddress), protection.Value, true);
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|
}
|
|
}
|
|
}
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|
} |