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efb135b74c
* Clear CPU side data on GPU buffer clears * Implement tracked fill operation that can signal other resource types except buffer * Fix tests, add missing XML doc * PR feedback
306 lines
13 KiB
C#
306 lines
13 KiB
C#
using Ryujinx.Common.Pools;
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using Ryujinx.Memory.Range;
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using System.Collections.Generic;
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namespace Ryujinx.Memory.Tracking
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{
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/// <summary>
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/// Manages memory tracking for a given virutal/physical memory block.
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/// </summary>
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public class MemoryTracking
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{
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private readonly IVirtualMemoryManager _memoryManager;
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private readonly InvalidAccessHandler _invalidAccessHandler;
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// Only use these from within the lock.
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private readonly NonOverlappingRangeList<VirtualRegion> _virtualRegions;
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private readonly int _pageSize;
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/// <summary>
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/// This lock must be obtained when traversing or updating the region-handle hierarchy.
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/// It is not required when reading dirty flags.
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/// </summary>
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internal object TrackingLock = new object();
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/// <summary>
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/// Create a new tracking structure for the given "physical" memory block,
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/// with a given "virtual" memory manager that will provide mappings and virtual memory protection.
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/// </summary>
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/// <param name="memoryManager">Virtual memory manager</param>
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/// <param name="block">Physical memory block</param>
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/// <param name="pageSize">Page size of the virtual memory space</param>
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public MemoryTracking(IVirtualMemoryManager memoryManager, int pageSize, InvalidAccessHandler invalidAccessHandler = null)
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{
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_memoryManager = memoryManager;
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_pageSize = pageSize;
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_invalidAccessHandler = invalidAccessHandler;
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_virtualRegions = new NonOverlappingRangeList<VirtualRegion>();
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}
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private (ulong address, ulong size) PageAlign(ulong address, ulong size)
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{
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ulong pageMask = (ulong)_pageSize - 1;
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ulong rA = address & ~pageMask;
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ulong rS = ((address + size + pageMask) & ~pageMask) - rA;
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return (rA, rS);
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}
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/// <summary>
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/// Indicate that a virtual region has been mapped, and which physical region it has been mapped to.
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/// Should be called after the mapping is complete.
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/// </summary>
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/// <param name="va">Virtual memory address</param>
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/// <param name="size">Size to be mapped</param>
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public void Map(ulong va, ulong size)
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{
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// A mapping may mean we need to re-evaluate each VirtualRegion's affected area.
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// Find all handles that overlap with the range, we need to recalculate their physical regions
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lock (TrackingLock)
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{
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ref var overlaps = ref ThreadStaticArray<VirtualRegion>.Get();
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int count = _virtualRegions.FindOverlapsNonOverlapping(va, size, ref overlaps);
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for (int i = 0; i < count; i++)
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{
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VirtualRegion region = overlaps[i];
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// If the region has been fully remapped, signal that it has been mapped again.
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bool remapped = _memoryManager.IsRangeMapped(region.Address, region.Size);
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if (remapped)
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{
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region.SignalMappingChanged(true);
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}
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region.UpdateProtection();
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}
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}
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}
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/// <summary>
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/// Indicate that a virtual region has been unmapped.
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/// Should be called before the unmapping is complete.
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/// </summary>
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/// <param name="va">Virtual memory address</param>
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/// <param name="size">Size to be unmapped</param>
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public void Unmap(ulong va, ulong size)
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{
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// An unmapping may mean we need to re-evaluate each VirtualRegion's affected area.
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// Find all handles that overlap with the range, we need to notify them that the region was unmapped.
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lock (TrackingLock)
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{
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ref var overlaps = ref ThreadStaticArray<VirtualRegion>.Get();
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int count = _virtualRegions.FindOverlapsNonOverlapping(va, size, ref overlaps);
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for (int i = 0; i < count; i++)
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{
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VirtualRegion region = overlaps[i];
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region.SignalMappingChanged(false);
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}
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}
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}
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/// <summary>
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/// Get a list of virtual regions that a handle covers.
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/// </summary>
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/// <param name="va">Starting virtual memory address of the handle</param>
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/// <param name="size">Size of the handle's memory region</param>
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/// <returns>A list of virtual regions within the given range</returns>
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internal List<VirtualRegion> GetVirtualRegionsForHandle(ulong va, ulong size)
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{
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List<VirtualRegion> result = new List<VirtualRegion>();
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_virtualRegions.GetOrAddRegions(result, va, size, (va, size) => new VirtualRegion(this, va, size));
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return result;
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}
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/// <summary>
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/// Remove a virtual region from the range list. This assumes that the lock has been acquired.
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/// </summary>
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/// <param name="region">Region to remove</param>
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internal void RemoveVirtual(VirtualRegion region)
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{
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_virtualRegions.Remove(region);
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}
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/// <summary>
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/// Obtains a memory tracking handle for the given virtual region, with a specified granularity. This should be disposed when finished with.
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/// </summary>
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/// <param name="address">CPU virtual address of the region</param>
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/// <param name="size">Size of the region</param>
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/// <param name="handles">Handles to inherit state from or reuse. When none are present, provide null</param>
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/// <param name="granularity">Desired granularity of write tracking</param>
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/// <param name="id">Handle ID</param>
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/// <returns>The memory tracking handle</returns>
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public MultiRegionHandle BeginGranularTracking(ulong address, ulong size, IEnumerable<IRegionHandle> handles, ulong granularity, int id)
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{
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return new MultiRegionHandle(this, address, size, handles, granularity, id);
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}
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/// <summary>
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/// Obtains a smart memory tracking handle for the given virtual region, with a specified granularity. This should be disposed when finished with.
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/// </summary>
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/// <param name="address">CPU virtual address of the region</param>
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/// <param name="size">Size of the region</param>
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/// <param name="granularity">Desired granularity of write tracking</param>
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/// <param name="id">Handle ID</param>
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/// <returns>The memory tracking handle</returns>
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public SmartMultiRegionHandle BeginSmartGranularTracking(ulong address, ulong size, ulong granularity, int id)
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{
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(address, size) = PageAlign(address, size);
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return new SmartMultiRegionHandle(this, address, size, granularity, id);
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}
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/// <summary>
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/// Obtains a memory tracking handle for the given virtual region. This should be disposed when finished with.
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/// </summary>
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/// <param name="address">CPU virtual address of the region</param>
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/// <param name="size">Size of the region</param>
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/// <param name="id">Handle ID</param>
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/// <returns>The memory tracking handle</returns>
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public RegionHandle BeginTracking(ulong address, ulong size, int id)
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{
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var (paAddress, paSize) = PageAlign(address, size);
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lock (TrackingLock)
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{
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bool mapped = _memoryManager.IsRangeMapped(address, size);
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RegionHandle handle = new RegionHandle(this, paAddress, paSize, address, size, id, mapped);
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return handle;
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}
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}
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/// <summary>
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/// Obtains a memory tracking handle for the given virtual region. This should be disposed when finished with.
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/// </summary>
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/// <param name="address">CPU virtual address of the region</param>
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/// <param name="size">Size of the region</param>
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/// <param name="bitmap">The bitmap owning the dirty flag for this handle</param>
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/// <param name="bit">The bit of this handle within the dirty flag</param>
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/// <param name="id">Handle ID</param>
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/// <returns>The memory tracking handle</returns>
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internal RegionHandle BeginTrackingBitmap(ulong address, ulong size, ConcurrentBitmap bitmap, int bit, int id)
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{
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var (paAddress, paSize) = PageAlign(address, size);
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lock (TrackingLock)
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{
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bool mapped = _memoryManager.IsRangeMapped(address, size);
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RegionHandle handle = new RegionHandle(this, paAddress, paSize, address, size, bitmap, bit, id, mapped);
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return handle;
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}
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}
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/// <summary>
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/// Signal that a virtual memory event happened at the given location.
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/// </summary>
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/// <param name="address">Virtual address accessed</param>
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/// <param name="size">Size of the region affected in bytes</param>
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/// <param name="write">Whether the region was written to or read</param>
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/// <returns>True if the event triggered any tracking regions, false otherwise</returns>
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public bool VirtualMemoryEvent(ulong address, ulong size, bool write)
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{
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return VirtualMemoryEvent(address, size, write, precise: false, null);
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}
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/// <summary>
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/// Signal that a virtual memory event happened at the given location.
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/// This can be flagged as a precise event, which will avoid reprotection and call special handlers if possible.
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/// A precise event has an exact address and size, rather than triggering on page granularity.
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/// </summary>
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/// <param name="address">Virtual address accessed</param>
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/// <param name="size">Size of the region affected in bytes</param>
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/// <param name="write">Whether the region was written to or read</param>
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/// <param name="precise">True if the access is precise, false otherwise</param>
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/// <param name="exemptId">Optional ID that of the handles that should not be signalled</param>
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/// <returns>True if the event triggered any tracking regions, false otherwise</returns>
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public bool VirtualMemoryEvent(ulong address, ulong size, bool write, bool precise, int? exemptId = null)
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{
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// Look up the virtual region using the region list.
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// Signal up the chain to relevant handles.
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bool shouldThrow = false;
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lock (TrackingLock)
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{
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ref var overlaps = ref ThreadStaticArray<VirtualRegion>.Get();
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int count = _virtualRegions.FindOverlapsNonOverlapping(address, size, ref overlaps);
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if (count == 0 && !precise)
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{
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if (_memoryManager.IsRangeMapped(address, size))
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{
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// TODO: There is currently the possibility that a page can be protected after its virtual region is removed.
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// This code handles that case when it happens, but it would be better to find out how this happens.
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_memoryManager.TrackingReprotect(address & ~(ulong)(_pageSize - 1), (ulong)_pageSize, MemoryPermission.ReadAndWrite);
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return true; // This memory _should_ be mapped, so we need to try again.
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}
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else
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{
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shouldThrow = true;
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}
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}
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else
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{
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for (int i = 0; i < count; i++)
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{
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VirtualRegion region = overlaps[i];
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if (precise)
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{
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region.SignalPrecise(address, size, write, exemptId);
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}
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else
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{
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region.Signal(address, size, write, exemptId);
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}
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}
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}
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}
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if (shouldThrow)
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{
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_invalidAccessHandler?.Invoke(address);
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// We can't continue - it's impossible to remove protection from the page.
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// Even if the access handler wants us to continue, we wouldn't be able to.
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throw new InvalidMemoryRegionException();
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}
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return true;
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}
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/// <summary>
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/// Reprotect a given virtual region. The virtual memory manager will handle this.
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/// </summary>
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/// <param name="region">Region to reprotect</param>
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/// <param name="permission">Memory permission to protect with</param>
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internal void ProtectVirtualRegion(VirtualRegion region, MemoryPermission permission)
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{
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_memoryManager.TrackingReprotect(region.Address, region.Size, permission);
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}
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/// <summary>
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/// Returns the number of virtual regions currently being tracked.
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/// Useful for tests and metrics.
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/// </summary>
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/// <returns>The number of virtual regions</returns>
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public int GetRegionCount()
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{
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lock (TrackingLock)
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{
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return _virtualRegions.Count;
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}
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}
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}
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}
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