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https://github.com/ryujinx-mirror/ryujinx.git
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2e143365eb
* Optimized memory modified check This was initially in some cases more expensive than plainly sending the data. Now it should have way better performance. * Small refactoring * renamed InvalidAccessEventArgs * Renamed PtPageBits * Removed ValueRange(set) They are currently unused and won't be likely to be used in the near future
83 lines
2.3 KiB
C#
83 lines
2.3 KiB
C#
using ChocolArm64.Events;
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using ChocolArm64.Memory;
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using System.Collections.Concurrent;
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namespace Ryujinx.Graphics.Memory
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{
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class NvGpuVmmCache
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{
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private const int PageBits = MemoryManager.PageBits;
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private const long PageSize = MemoryManager.PageSize;
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private const long PageMask = MemoryManager.PageMask;
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private ConcurrentDictionary<long, int>[] CachedPages;
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private MemoryManager _memory;
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public NvGpuVmmCache(MemoryManager memory)
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{
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_memory = memory;
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_memory.ObservedAccess += MemoryAccessHandler;
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CachedPages = new ConcurrentDictionary<long, int>[1 << 20];
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}
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private void MemoryAccessHandler(object sender, MemoryAccessEventArgs e)
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{
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long pa = _memory.GetPhysicalAddress(e.Position);
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CachedPages[pa >> PageBits]?.Clear();
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}
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public bool IsRegionModified(long position, long size, NvGpuBufferType bufferType)
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{
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long pa = _memory.GetPhysicalAddress(position);
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long addr = pa;
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long endAddr = (addr + size + PageMask) & ~PageMask;
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int newBuffMask = 1 << (int)bufferType;
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_memory.StartObservingRegion(position, size);
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long cachedPagesCount = 0;
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while (addr < endAddr)
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{
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long page = addr >> PageBits;
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ConcurrentDictionary<long, int> dictionary = CachedPages[page];
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if (dictionary == null)
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{
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dictionary = new ConcurrentDictionary<long, int>();
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CachedPages[page] = dictionary;
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}
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if (dictionary.TryGetValue(pa, out int currBuffMask))
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{
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if ((currBuffMask & newBuffMask) != 0)
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{
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cachedPagesCount++;
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}
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else
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{
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dictionary[pa] |= newBuffMask;
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}
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}
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else
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{
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dictionary[pa] = newBuffMask;
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}
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addr += PageSize;
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}
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return cachedPagesCount != (endAddr - pa + PageMask) >> PageBits;
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}
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}
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} |