Ryujinx/Ryujinx.Memory/Tracking/MemoryTracking.cs
riperiperi d92fff541b
Replace CacheResourceWrite with more general "precise" write (#2684)
* Replace CacheResourceWrite with more general "precise" write

The goal of CacheResourceWrite was to notify GPU resources when they were modified directly, by looking up the modified address/size in a structure and calling a method on each resource. The downside of this is that each resource cache has to be queried individually, they all have to implement their own way to do this, and it can only signal to resources using the same PhysicalMemory instance.

This PR adds the ability to signal a write as "precise" on the tracking, which signals a special handler (if present) which can be used to avoid unnecessary flush actions, or maybe even more. For buffers, precise writes specifically do not flush, and instead punch a hole in the modified range list to indicate that the data on GPU has been replaced.

The downside is that precise actions must ignore the page protection bits and always signal - as they need to notify the target resource to ignore the sequence number optimization.

I had to reintroduce the sequence number increment after I2M, as removing it was causing issues in rabbids kingdom battle. However - all resources modified by I2M are notified directly to lower their sequence number, so the problem is likely that another unrelated resource is not being properly updated. Thankfully, doing this does not affect performance in the games I tested.

This should fix regressions from #2624. Test any games that were broken by that. (RF4, rabbids kingdom battle)

I've also added a sequence number increment to ThreedClass.IncrementSyncpoint, as it seems to fix buffer corruption in OpenGL homebrew. (this was a regression from removing sequence number increment from constant buffer update - another unrelated resource thing)

* Add tests.

* Add XML docs for GpuRegionHandle

* Skip UpdateProtection if only precise actions were called

This allows precise actions to skip reprotection costs.
2021-09-29 02:27:03 +02:00

268 lines
11 KiB
C#

using Ryujinx.Common.Pools;
using Ryujinx.Memory.Range;
using System;
using System.Collections.Generic;
namespace Ryujinx.Memory.Tracking
{
/// <summary>
/// Manages memory tracking for a given virutal/physical memory block.
/// </summary>
public class MemoryTracking
{
private readonly IVirtualMemoryManager _memoryManager;
private readonly InvalidAccessHandler _invalidAccessHandler;
// Only use these from within the lock.
private readonly NonOverlappingRangeList<VirtualRegion> _virtualRegions;
private readonly int _pageSize;
/// <summary>
/// This lock must be obtained when traversing or updating the region-handle hierarchy.
/// It is not required when reading dirty flags.
/// </summary>
internal object TrackingLock = new object();
/// <summary>
/// Create a new tracking structure for the given "physical" memory block,
/// with a given "virtual" memory manager that will provide mappings and virtual memory protection.
/// </summary>
/// <param name="memoryManager">Virtual memory manager</param>
/// <param name="block">Physical memory block</param>
/// <param name="pageSize">Page size of the virtual memory space</param>
public MemoryTracking(IVirtualMemoryManager memoryManager, int pageSize, InvalidAccessHandler invalidAccessHandler = null)
{
_memoryManager = memoryManager;
_pageSize = pageSize;
_invalidAccessHandler = invalidAccessHandler;
_virtualRegions = new NonOverlappingRangeList<VirtualRegion>();
}
private (ulong address, ulong size) PageAlign(ulong address, ulong size)
{
ulong pageMask = (ulong)_pageSize - 1;
ulong rA = address & ~pageMask;
ulong rS = ((address + size + pageMask) & ~pageMask) - rA;
return (rA, rS);
}
/// <summary>
/// Indicate that a virtual region has been mapped, and which physical region it has been mapped to.
/// Should be called after the mapping is complete.
/// </summary>
/// <param name="va">Virtual memory address</param>
/// <param name="size">Size to be mapped</param>
public void Map(ulong va, ulong size)
{
// A mapping may mean we need to re-evaluate each VirtualRegion's affected area.
// Find all handles that overlap with the range, we need to recalculate their physical regions
lock (TrackingLock)
{
ref var overlaps = ref ThreadStaticArray<VirtualRegion>.Get();
int count = _virtualRegions.FindOverlapsNonOverlapping(va, size, ref overlaps);
for (int i = 0; i < count; i++)
{
VirtualRegion region = overlaps[i];
// If the region has been fully remapped, signal that it has been mapped again.
bool remapped = _memoryManager.IsRangeMapped(region.Address, region.Size);
if (remapped)
{
region.SignalMappingChanged(true);
}
region.UpdateProtection();
}
}
}
/// <summary>
/// Indicate that a virtual region has been unmapped.
/// Should be called before the unmapping is complete.
/// </summary>
/// <param name="va">Virtual memory address</param>
/// <param name="size">Size to be unmapped</param>
public void Unmap(ulong va, ulong size)
{
// An unmapping may mean we need to re-evaluate each VirtualRegion's affected area.
// Find all handles that overlap with the range, we need to notify them that the region was unmapped.
lock (TrackingLock)
{
ref var overlaps = ref ThreadStaticArray<VirtualRegion>.Get();
int count = _virtualRegions.FindOverlapsNonOverlapping(va, size, ref overlaps);
for (int i = 0; i < count; i++)
{
VirtualRegion region = overlaps[i];
region.SignalMappingChanged(false);
}
}
}
/// <summary>
/// Get a list of virtual regions that a handle covers.
/// </summary>
/// <param name="va">Starting virtual memory address of the handle</param>
/// <param name="size">Size of the handle's memory region</param>
/// <returns>A list of virtual regions within the given range</returns>
internal List<VirtualRegion> GetVirtualRegionsForHandle(ulong va, ulong size)
{
List<VirtualRegion> result = new List<VirtualRegion>();
_virtualRegions.GetOrAddRegions(result, va, size, (va, size) => new VirtualRegion(this, va, size));
return result;
}
/// <summary>
/// Remove a virtual region from the range list. This assumes that the lock has been acquired.
/// </summary>
/// <param name="region">Region to remove</param>
internal void RemoveVirtual(VirtualRegion region)
{
_virtualRegions.Remove(region);
}
/// <summary>
/// Obtains a memory tracking handle for the given virtual region, with a specified granularity. This should be disposed when finished with.
/// </summary>
/// <param name="address">CPU virtual address of the region</param>
/// <param name="size">Size of the region</param>
/// <param name="handles">Handles to inherit state from or reuse. When none are present, provide null</param>
/// <param name="granularity">Desired granularity of write tracking</param>
/// <returns>The memory tracking handle</returns>
public MultiRegionHandle BeginGranularTracking(ulong address, ulong size, IEnumerable<IRegionHandle> handles, ulong granularity)
{
(address, size) = PageAlign(address, size);
return new MultiRegionHandle(this, address, size, handles, granularity);
}
/// <summary>
/// Obtains a smart memory tracking handle for the given virtual region, with a specified granularity. This should be disposed when finished with.
/// </summary>
/// <param name="address">CPU virtual address of the region</param>
/// <param name="size">Size of the region</param>
/// <param name="granularity">Desired granularity of write tracking</param>
/// <returns>The memory tracking handle</returns>
public SmartMultiRegionHandle BeginSmartGranularTracking(ulong address, ulong size, ulong granularity)
{
(address, size) = PageAlign(address, size);
return new SmartMultiRegionHandle(this, address, size, granularity);
}
/// <summary>
/// Obtains a memory tracking handle for the given virtual region. This should be disposed when finished with.
/// </summary>
/// <param name="address">CPU virtual address of the region</param>
/// <param name="size">Size of the region</param>
/// <returns>The memory tracking handle</returns>
public RegionHandle BeginTracking(ulong address, ulong size)
{
(address, size) = PageAlign(address, size);
lock (TrackingLock)
{
RegionHandle handle = new RegionHandle(this, address, size, _memoryManager.IsRangeMapped(address, size));
return handle;
}
}
/// <summary>
/// Signal that a virtual memory event happened at the given location (one byte).
/// </summary>
/// <param name="address">Virtual address accessed</param>
/// <param name="write">Whether the address was written to or read</param>
/// <returns>True if the event triggered any tracking regions, false otherwise</returns>
public bool VirtualMemoryEventTracking(ulong address, bool write)
{
return VirtualMemoryEvent(address, 1, write);
}
/// <summary>
/// Signal that a virtual memory event happened at the given location.
/// This can be flagged as a precise event, which will avoid reprotection and call special handlers if possible.
/// A precise event has an exact address and size, rather than triggering on page granularity.
/// </summary>
/// <param name="address">Virtual address accessed</param>
/// <param name="size">Size of the region affected in bytes</param>
/// <param name="write">Whether the region was written to or read</param>
/// <param name="precise">True if the access is precise, false otherwise</param>
/// <returns>True if the event triggered any tracking regions, false otherwise</returns>
public bool VirtualMemoryEvent(ulong address, ulong size, bool write, bool precise = false)
{
// Look up the virtual region using the region list.
// Signal up the chain to relevant handles.
lock (TrackingLock)
{
ref var overlaps = ref ThreadStaticArray<VirtualRegion>.Get();
int count = _virtualRegions.FindOverlapsNonOverlapping(address, size, ref overlaps);
if (count == 0 && !precise)
{
if (!_memoryManager.IsMapped(address))
{
_invalidAccessHandler?.Invoke(address);
// We can't continue - it's impossible to remove protection from the page.
// Even if the access handler wants us to continue, we wouldn't be able to.
throw new InvalidMemoryRegionException();
}
_memoryManager.TrackingReprotect(address & ~(ulong)(_pageSize - 1), (ulong)_pageSize, MemoryPermission.ReadAndWrite);
return false; // We can't handle this - it's probably a real invalid access.
}
for (int i = 0; i < count; i++)
{
VirtualRegion region = overlaps[i];
if (precise)
{
region.SignalPrecise(address, size, write);
}
else
{
region.Signal(address, size, write);
}
}
}
return true;
}
/// <summary>
/// Reprotect a given virtual region. The virtual memory manager will handle this.
/// </summary>
/// <param name="region">Region to reprotect</param>
/// <param name="permission">Memory permission to protect with</param>
internal void ProtectVirtualRegion(VirtualRegion region, MemoryPermission permission)
{
_memoryManager.TrackingReprotect(region.Address, region.Size, permission);
}
/// <summary>
/// Returns the number of virtual regions currently being tracked.
/// Useful for tests and metrics.
/// </summary>
/// <returns>The number of virtual regions</returns>
public int GetRegionCount()
{
lock (TrackingLock)
{
return _virtualRegions.Count;
}
}
}
}