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using ChocolArm64.Memory;
using System;
using System.Collections.Generic;
namespace Ryujinx.HLE.Gpu.Memory
{
class NvGpuVmmCache
{
private const int MaxCpCount = 10000;
private const int MaxCpTimeDelta = 60000;
private class CachedPage
{
private struct Range
{
public long Start;
public long End;
public Range(long Start, long End)
{
this.Start = Start;
this.End = End;
}
}
private List<Range>[] Regions;
public LinkedListNode<long> Node { get; set; }
public int Timestamp { get; private set; }
public CachedPage()
{
Regions = new List<Range>[(int)NvGpuBufferType.Count];
for (int Index = 0; Index < Regions.Length; Index++)
{
Regions[Index] = new List<Range>();
}
}
public bool AddRange(long Start, long End, NvGpuBufferType BufferType)
{
List<Range> BtRegions = Regions[(int)BufferType];
for (int Index = 0; Index < BtRegions.Count; Index++)
{
Range Rg = BtRegions[Index];
if (Start >= Rg.Start && End <= Rg.End)
{
return false;
}
if (Start <= Rg.End && Rg.Start <= End)
{
long MinStart = Math.Min(Rg.Start, Start);
long MaxEnd = Math.Max(Rg.End, End);
BtRegions[Index] = new Range(MinStart, MaxEnd);
Timestamp = Environment.TickCount;
return true;
}
}
BtRegions.Add(new Range(Start, End));
Timestamp = Environment.TickCount;
return true;
}
public int GetTotalCount()
{
int Count = 0;
for (int Index = 0; Index < Regions.Length; Index++)
{
Count += Regions[Index].Count;
}
return Count;
}
}
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 PA, long Size)
{
bool[] Modified = Memory.IsRegionModified(PA, Size);
if (Modified == null)
{
return true;
}
ClearCachedPagesIfNeeded();
long PageSize = Memory.GetHostPageSize();
long Mask = PageSize - 1;
long PAEnd = PA + Size;
bool RegMod = false;
int Index = 0;
while (PA < PAEnd)
{
long Key = PA & ~Mask;
long PAPgEnd = Math.Min((PA + PageSize) & ~Mask, PAEnd);
bool IsCached = Cache.TryGetValue(Key, out CachedPage Cp);
if (IsCached)
{
CpCount -= Cp.GetTotalCount();
SortedCache.Remove(Cp.Node);
}
else
{
Cp = new CachedPage();
Cache.Add(Key, Cp);
}
if (Modified[Index++] && IsCached)
{
Cp = new CachedPage();
Cache[Key] = Cp;
}
Cp.Node = SortedCache.AddLast(Key);
RegMod |= Cp.AddRange(PA, PAPgEnd, BufferType);
CpCount += Cp.GetTotalCount();
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.GetTotalCount();
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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