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TSR Berry 2023-04-08 01:22:00 +02:00 • committed by Mary
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src/Ryujinx.Graphics.Gpu/Memory/BufferCache.cs Normal file
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using Ryujinx.Graphics.GAL;
using Ryujinx.Memory.Range;
using System;
using System.Collections.Generic;
using System.Linq;
namespace Ryujinx.Graphics.Gpu.Memory
{
/// <summary>
/// Buffer cache.
/// </summary>
class BufferCache : IDisposable
{
private const int OverlapsBufferInitialCapacity = 10;
private const int OverlapsBufferMaxCapacity = 10000;
private const ulong BufferAlignmentSize = 0x1000;
private const ulong BufferAlignmentMask = BufferAlignmentSize - 1;
private const ulong MaxDynamicGrowthSize = 0x100000;
private readonly GpuContext _context;
private readonly PhysicalMemory _physicalMemory;
/// <remarks>
/// Only modified from the GPU thread. Must lock for add/remove.
/// Must lock for any access from other threads.
/// </remarks>
private readonly RangeList<Buffer> _buffers;
private Buffer[] _bufferOverlaps;
private readonly Dictionary<ulong, BufferCacheEntry> _dirtyCache;
private readonly Dictionary<ulong, BufferCacheEntry> _modifiedCache;
private bool _pruneCaches;
public event Action NotifyBuffersModified;
/// <summary>
/// Creates a new instance of the buffer manager.
/// </summary>
/// <param name="context">The GPU context that the buffer manager belongs to</param>
/// <param name="physicalMemory">Physical memory where the cached buffers are mapped</param>
public BufferCache(GpuContext context, PhysicalMemory physicalMemory)
{
_context = context;
_physicalMemory = physicalMemory;
_buffers = new RangeList<Buffer>();
_bufferOverlaps = new Buffer[OverlapsBufferInitialCapacity];
_dirtyCache = new Dictionary<ulong, BufferCacheEntry>();
// There are a lot more entries on the modified cache, so it is separate from the one for ForceDirty.
_modifiedCache = new Dictionary<ulong, BufferCacheEntry>();
}
/// <summary>
/// Handles removal of buffers written to a memory region being unmapped.
/// </summary>
/// <param name="sender">Sender object</param>
/// <param name="e">Event arguments</param>
public void MemoryUnmappedHandler(object sender, UnmapEventArgs e)
{
Buffer[] overlaps = new Buffer[10];
int overlapCount;
ulong address = ((MemoryManager)sender).Translate(e.Address);
ulong size = e.Size;
lock (_buffers)
{
overlapCount = _buffers.FindOverlaps(address, size, ref overlaps);
}
for (int i = 0; i < overlapCount; i++)
{
overlaps[i].Unmapped(address, size);
}
}
/// <summary>
/// Performs address translation of the GPU virtual address, and creates a
/// new buffer, if needed, for the specified range.
/// </summary>
/// <param name="memoryManager">GPU memory manager where the buffer is mapped</param>
/// <param name="gpuVa">Start GPU virtual address of the buffer</param>
/// <param name="size">Size in bytes of the buffer</param>
/// <returns>CPU virtual address of the buffer, after address translation</returns>
public ulong TranslateAndCreateBuffer(MemoryManager memoryManager, ulong gpuVa, ulong size)
{
if (gpuVa == 0)
{
return 0;
}
ulong address = memoryManager.Translate(gpuVa);
if (address == MemoryManager.PteUnmapped)
{
return 0;
}
CreateBuffer(address, size);
return address;
}
/// <summary>
/// Creates a new buffer for the specified range, if it does not yet exist.
/// This can be used to ensure the existance of a buffer.
/// </summary>
/// <param name="address">Address of the buffer in memory</param>
/// <param name="size">Size of the buffer in bytes</param>
public void CreateBuffer(ulong address, ulong size)
{
ulong endAddress = address + size;
ulong alignedAddress = address & ~BufferAlignmentMask;
ulong alignedEndAddress = (endAddress + BufferAlignmentMask) & ~BufferAlignmentMask;
// The buffer must have the size of at least one page.
if (alignedEndAddress == alignedAddress)
{
alignedEndAddress += BufferAlignmentSize;
}
CreateBufferAligned(alignedAddress, alignedEndAddress - alignedAddress);
}
/// <summary>
/// Performs address translation of the GPU virtual address, and attempts to force
/// the buffer in the region as dirty.
/// The buffer lookup for this function is cached in a dictionary for quick access, which
/// accelerates common UBO updates.
/// </summary>
/// <param name="memoryManager">GPU memory manager where the buffer is mapped</param>
/// <param name="gpuVa">Start GPU virtual address of the buffer</param>
/// <param name="size">Size in bytes of the buffer</param>
public void ForceDirty(MemoryManager memoryManager, ulong gpuVa, ulong size)
{
if (_pruneCaches)
{
Prune();
}
if (!_dirtyCache.TryGetValue(gpuVa, out BufferCacheEntry result) ||
result.EndGpuAddress < gpuVa + size ||
result.UnmappedSequence != result.Buffer.UnmappedSequence)
{
ulong address = TranslateAndCreateBuffer(memoryManager, gpuVa, size);
result = new BufferCacheEntry(address, gpuVa, GetBuffer(address, size));
_dirtyCache[gpuVa] = result;
}
result.Buffer.ForceDirty(result.Address, size);
}
/// <summary>
/// Checks if the given buffer range has been GPU modifed.
/// </summary>
/// <param name="memoryManager">GPU memory manager where the buffer is mapped</param>
/// <param name="gpuVa">Start GPU virtual address of the buffer</param>
/// <param name="size">Size in bytes of the buffer</param>
/// <returns>True if modified, false otherwise</returns>
public bool CheckModified(MemoryManager memoryManager, ulong gpuVa, ulong size, out ulong outAddr)
{
if (_pruneCaches)
{
Prune();
}
// Align the address to avoid creating too many entries on the quick lookup dictionary.
ulong mask = BufferAlignmentMask;
ulong alignedGpuVa = gpuVa & (~mask);
ulong alignedEndGpuVa = (gpuVa + size + mask) & (~mask);
size = alignedEndGpuVa - alignedGpuVa;
if (!_modifiedCache.TryGetValue(alignedGpuVa, out BufferCacheEntry result) ||
result.EndGpuAddress < alignedEndGpuVa ||
result.UnmappedSequence != result.Buffer.UnmappedSequence)
{
ulong address = TranslateAndCreateBuffer(memoryManager, alignedGpuVa, size);
result = new BufferCacheEntry(address, alignedGpuVa, GetBuffer(address, size));
_modifiedCache[alignedGpuVa] = result;
}
outAddr = result.Address | (gpuVa & mask);
return result.Buffer.IsModified(result.Address, size);
}
/// <summary>
/// Creates a new buffer for the specified range, if needed.
/// If a buffer where this range can be fully contained already exists,
/// then the creation of a new buffer is not necessary.
/// </summary>
/// <param name="address">Address of the buffer in guest memory</param>
/// <param name="size">Size in bytes of the buffer</param>
private void CreateBufferAligned(ulong address, ulong size)
{
int overlapsCount = _buffers.FindOverlapsNonOverlapping(address, size, ref _bufferOverlaps);
if (overlapsCount != 0)
{
// The buffer already exists. We can just return the existing buffer
// if the buffer we need is fully contained inside the overlapping buffer.
// Otherwise, we must delete the overlapping buffers and create a bigger buffer
// that fits all the data we need. We also need to copy the contents from the
// old buffer(s) to the new buffer.
ulong endAddress = address + size;
if (_bufferOverlaps[0].Address > address || _bufferOverlaps[0].EndAddress < endAddress)
{
// Check if the following conditions are met:
// - We have a single overlap.
// - The overlap starts at or before the requested range. That is, the overlap happens at the end.
// - The size delta between the new, merged buffer and the old one is of at most 2 pages.
// In this case, we attempt to extend the buffer further than the requested range,
// this can potentially avoid future resizes if the application keeps using overlapping
// sequential memory.
// Allowing for 2 pages (rather than just one) is necessary to catch cases where the
// range crosses a page, and after alignment, ends having a size of 2 pages.
if (overlapsCount == 1 &&
address >= _bufferOverlaps[0].Address &&
endAddress - _bufferOverlaps[0].EndAddress <= BufferAlignmentSize * 2)
{
// Try to grow the buffer by 1.5x of its current size.
// This improves performance in the cases where the buffer is resized often by small amounts.
ulong existingSize = _bufferOverlaps[0].Size;
ulong growthSize = (existingSize + Math.Min(existingSize >> 1, MaxDynamicGrowthSize)) & ~BufferAlignmentMask;
size = Math.Max(size, growthSize);
endAddress = address + size;
overlapsCount = _buffers.FindOverlapsNonOverlapping(address, size, ref _bufferOverlaps);
}
for (int index = 0; index < overlapsCount; index++)
{
Buffer buffer = _bufferOverlaps[index];
address = Math.Min(address, buffer.Address);
endAddress = Math.Max(endAddress, buffer.EndAddress);
lock (_buffers)
{
_buffers.Remove(buffer);
}
}
ulong newSize = endAddress - address;
Buffer newBuffer = new Buffer(_context, _physicalMemory, address, newSize, _bufferOverlaps.Take(overlapsCount));
lock (_buffers)
{
_buffers.Add(newBuffer);
}
for (int index = 0; index < overlapsCount; index++)
{
Buffer buffer = _bufferOverlaps[index];
int dstOffset = (int)(buffer.Address - newBuffer.Address);
buffer.CopyTo(newBuffer, dstOffset);
newBuffer.InheritModifiedRanges(buffer);
buffer.DecrementReferenceCount();
}
newBuffer.SynchronizeMemory(address, newSize);
// Existing buffers were modified, we need to rebind everything.
NotifyBuffersModified?.Invoke();
}
}
else
{
// No overlap, just create a new buffer.
Buffer buffer = new Buffer(_context, _physicalMemory, address, size);
lock (_buffers)
{
_buffers.Add(buffer);
}
}
ShrinkOverlapsBufferIfNeeded();
}
/// <summary>
/// Resizes the temporary buffer used for range list intersection results, if it has grown too much.
/// </summary>
private void ShrinkOverlapsBufferIfNeeded()
{
if (_bufferOverlaps.Length > OverlapsBufferMaxCapacity)
{
Array.Resize(ref _bufferOverlaps, OverlapsBufferMaxCapacity);
}
}
/// <summary>
/// Copy a buffer data from a given address to another.
/// </summary>
/// <remarks>
/// This does a GPU side copy.
/// </remarks>
/// <param name="memoryManager">GPU memory manager where the buffer is mapped</param>
/// <param name="srcVa">GPU virtual address of the copy source</param>
/// <param name="dstVa">GPU virtual address of the copy destination</param>
/// <param name="size">Size in bytes of the copy</param>
public void CopyBuffer(MemoryManager memoryManager, ulong srcVa, ulong dstVa, ulong size)
{
ulong srcAddress = TranslateAndCreateBuffer(memoryManager, srcVa, size);
ulong dstAddress = TranslateAndCreateBuffer(memoryManager, dstVa, size);
Buffer srcBuffer = GetBuffer(srcAddress, size);
Buffer dstBuffer = GetBuffer(dstAddress, size);
int srcOffset = (int)(srcAddress - srcBuffer.Address);
int dstOffset = (int)(dstAddress - dstBuffer.Address);
_context.Renderer.Pipeline.CopyBuffer(
srcBuffer.Handle,
dstBuffer.Handle,
srcOffset,
dstOffset,
(int)size);
if (srcBuffer.IsModified(srcAddress, size))
{
dstBuffer.SignalModified(dstAddress, size);
}
else
{
// Optimization: If the data being copied is already in memory, then copy it directly instead of flushing from GPU.
dstBuffer.ClearModified(dstAddress, size);
memoryManager.Physical.WriteUntracked(dstAddress, memoryManager.Physical.GetSpan(srcAddress, (int)size));
}
}
/// <summary>
/// Clears a buffer at a given address with the specified value.
/// </summary>
/// <remarks>
/// Both the address and size must be aligned to 4 bytes.
/// </remarks>
/// <param name="memoryManager">GPU memory manager where the buffer is mapped</param>
/// <param name="gpuVa">GPU virtual address of the region to clear</param>
/// <param name="size">Number of bytes to clear</param>
/// <param name="value">Value to be written into the buffer</param>
public void ClearBuffer(MemoryManager memoryManager, ulong gpuVa, ulong size, uint value)
{
ulong address = TranslateAndCreateBuffer(memoryManager, gpuVa, size);
Buffer buffer = GetBuffer(address, size);
int offset = (int)(address - buffer.Address);
_context.Renderer.Pipeline.ClearBuffer(buffer.Handle, offset, (int)size, value);
memoryManager.Physical.FillTrackedResource(address, size, value, ResourceKind.Buffer);
}
/// <summary>
/// Gets a buffer sub-range starting at a given memory address.
/// </summary>
/// <param name="address">Start address of the memory range</param>
/// <param name="size">Size in bytes of the memory range</param>
/// <param name="write">Whether the buffer will be written to by this use</param>
/// <returns>The buffer sub-range starting at the given memory address</returns>
public BufferRange GetBufferRangeTillEnd(ulong address, ulong size, bool write = false)
{
return GetBuffer(address, size, write).GetRange(address);
}
/// <summary>
/// Gets a buffer sub-range for a given memory range.
/// </summary>
/// <param name="address">Start address of the memory range</param>
/// <param name="size">Size in bytes of the memory range</param>
/// <param name="write">Whether the buffer will be written to by this use</param>
/// <returns>The buffer sub-range for the given range</returns>
public BufferRange GetBufferRange(ulong address, ulong size, bool write = false)
{
return GetBuffer(address, size, write).GetRange(address, size);
}
/// <summary>
/// Gets a buffer for a given memory range.
/// A buffer overlapping with the specified range is assumed to already exist on the cache.
/// </summary>
/// <param name="address">Start address of the memory range</param>
/// <param name="size">Size in bytes of the memory range</param>
/// <param name="write">Whether the buffer will be written to by this use</param>
/// <returns>The buffer where the range is fully contained</returns>
private Buffer GetBuffer(ulong address, ulong size, bool write = false)
{
Buffer buffer;
if (size != 0)
{
buffer = _buffers.FindFirstOverlap(address, size);
buffer.SynchronizeMemory(address, size);
if (write)
{
buffer.SignalModified(address, size);
}
}
else
{
buffer = _buffers.FindFirstOverlap(address, 1);
}
return buffer;
}
/// <summary>
/// Performs guest to host memory synchronization of a given memory range.
/// </summary>
/// <param name="address">Start address of the memory range</param>
/// <param name="size">Size in bytes of the memory range</param>
public void SynchronizeBufferRange(ulong address, ulong size)
{
if (size != 0)
{
Buffer buffer = _buffers.FindFirstOverlap(address, size);
buffer.SynchronizeMemory(address, size);
}
}
/// <summary>
/// Prune any invalid entries from a quick access dictionary.
/// </summary>
/// <param name="dictionary">Dictionary to prune</param>
/// <param name="toDelete">List used to track entries to delete</param>
private void Prune(Dictionary<ulong, BufferCacheEntry> dictionary, ref List<ulong> toDelete)
{
foreach (var entry in dictionary)
{
if (entry.Value.UnmappedSequence != entry.Value.Buffer.UnmappedSequence)
{
(toDelete ??= new()).Add(entry.Key);
}
}
if (toDelete != null)
{
foreach (ulong entry in toDelete)
{
dictionary.Remove(entry);
}
}
}
/// <summary>
/// Prune any invalid entries from the quick access dictionaries.
/// </summary>
private void Prune()
{
List<ulong> toDelete = null;
Prune(_dirtyCache, ref toDelete);
toDelete?.Clear();
Prune(_modifiedCache, ref toDelete);
_pruneCaches = false;
}
/// <summary>
/// Queues a prune of invalid entries the next time a dictionary cache is accessed.
/// </summary>
public void QueuePrune()
{
_pruneCaches = true;
}
/// <summary>
/// Disposes all buffers in the cache.
/// It's an error to use the buffer manager after disposal.
/// </summary>
public void Dispose()
{
lock (_buffers)
{
foreach (Buffer buffer in _buffers)
{
buffer.Dispose();
}
}
}
}
}