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using ChocolArm64.Memory;
using System;
using System.Collections.Generic;
namespace Ryujinx.HLE.Gpu
{
class NvGpuVmmCache
{
private const int MaxCpCount = 10000;
private const int MaxCpTimeDelta = 60000;
private class CachedPage
{
private List<(long Start, long End)> Regions;
public LinkedListNode<long> Node { get; set; }
public int Count => Regions.Count;
public int Timestamp { get; private set; }
public long PABase { get; private set; }
public NvGpuBufferType BufferType { get; private set; }
public CachedPage(long PABase, NvGpuBufferType BufferType)
{
this.PABase = PABase;
this.BufferType = BufferType;
Regions = new List<(long, long)>();
}
public bool AddRange(long Start, long End)
{
for (int Index = 0; Index < Regions.Count; Index++)
{
(long RgStart, long RgEnd) = Regions[Index];
if (Start >= RgStart && End <= RgEnd)
{
return false;
}
if (Start <= RgEnd && RgStart <= End)
{
long MinStart = Math.Min(RgStart, Start);
long MaxEnd = Math.Max(RgEnd, End);
Regions[Index] = (MinStart, MaxEnd);
Timestamp = Environment.TickCount;
return true;
}
}
Regions.Add((Start, End));
Timestamp = Environment.TickCount;
return true;
}
}
private Dictionary<long, CachedPage> Cache;
private LinkedList<long> SortedCache;
private int CpCount;
public NvGpuVmmCache()
{
Cache = new Dictionary<long, CachedPage>();
SortedCache = new LinkedList<long>();
}
public bool IsRegionModified(
AMemory Memory,
NvGpuBufferType BufferType,
long VA,
long PA,
long Size)
{
ClearCachedPagesIfNeeded();
long PageSize = Memory.GetHostPageSize();
long Mask = PageSize - 1;
long VAEnd = VA + Size;
long PAEnd = PA + Size;
bool RegMod = false;
while (VA < VAEnd)
{
long Key = VA & ~Mask;
long PABase = PA & ~Mask;
long VAPgEnd = Math.Min((VA + PageSize) & ~Mask, VAEnd);
long PAPgEnd = Math.Min((PA + PageSize) & ~Mask, PAEnd);
bool IsCached = Cache.TryGetValue(Key, out CachedPage Cp);
bool PgReset = false;
if (!IsCached)
{
Cp = new CachedPage(PABase, BufferType);
Cache.Add(Key, Cp);
}
else
{
CpCount -= Cp.Count;
SortedCache.Remove(Cp.Node);
if (Cp.PABase != PABase ||
Cp.BufferType != BufferType)
{
PgReset = true;
}
}
PgReset |= Memory.IsRegionModified(PA, PAPgEnd - PA) && IsCached;
if (PgReset)
{
Cp = new CachedPage(PABase, BufferType);
Cache[Key] = Cp;
}
Cp.Node = SortedCache.AddLast(Key);
RegMod |= Cp.AddRange(VA, VAPgEnd);
CpCount += Cp.Count;
VA = VAPgEnd;
PA = PAPgEnd;
}
return RegMod;
}
private void ClearCachedPagesIfNeeded()
{
if (CpCount <= MaxCpCount)
{
return;
}
int Timestamp = Environment.TickCount;
int TimeDelta;
do
{
if (!TryPopOldestCachedPageKey(Timestamp, out long Key))
{
break;
}
CachedPage Cp = Cache[Key];
Cache.Remove(Key);
CpCount -= Cp.Count;
TimeDelta = RingDelta(Cp.Timestamp, Timestamp);
}
while (CpCount > (MaxCpCount >> 1) || (uint)TimeDelta > (uint)MaxCpTimeDelta);
}
private bool TryPopOldestCachedPageKey(int Timestamp, out long Key)
{
LinkedListNode<long> Node = SortedCache.First;
if (Node == null)
{
Key = 0;
return false;
}
SortedCache.Remove(Node);
Key = Node.Value;
return true;
}
private int RingDelta(int Old, int New)
{
if ((uint)New < (uint)Old)
{
return New + (~Old + 1);
}
else
{
return New - Old;
}
}
}
}
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