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using Ryujinx.Common;
using Ryujinx.Common.Collections;
using Ryujinx.Common.Logging;
using Silk.NET.Vulkan;
using Silk.NET.Vulkan.Extensions.EXT;
using System;
using System.Collections.Generic;
namespace Ryujinx.Graphics.Vulkan
{
internal class HostMemoryAllocator
{
private readonly struct HostMemoryAllocation
{
public readonly Auto<MemoryAllocation> Allocation;
public readonly IntPtr Pointer;
public readonly ulong Size;
public ulong Start => (ulong)Pointer;
public ulong End => (ulong)Pointer + Size;
public HostMemoryAllocation(Auto<MemoryAllocation> allocation, IntPtr pointer, ulong size)
{
Allocation = allocation;
Pointer = pointer;
Size = size;
}
}
private readonly MemoryAllocator _allocator;
private readonly Vk _api;
private readonly ExtExternalMemoryHost _hostMemoryApi;
private readonly Device _device;
private readonly object _lock = new();
private readonly List<HostMemoryAllocation> _allocations;
private readonly IntervalTree<ulong, HostMemoryAllocation> _allocationTree;
public HostMemoryAllocator(MemoryAllocator allocator, Vk api, ExtExternalMemoryHost hostMemoryApi, Device device)
{
_allocator = allocator;
_api = api;
_hostMemoryApi = hostMemoryApi;
_device = device;
_allocations = new List<HostMemoryAllocation>();
_allocationTree = new IntervalTree<ulong, HostMemoryAllocation>();
}
public unsafe bool TryImport(
MemoryRequirements requirements,
MemoryPropertyFlags flags,
IntPtr pointer,
ulong size)
{
lock (_lock)
{
// Does a compatible allocation exist in the tree?
var allocations = new HostMemoryAllocation[10];
ulong start = (ulong)pointer;
ulong end = start + size;
int count = _allocationTree.Get(start, end, ref allocations);
// A compatible range is one that where the start and end completely cover the requested range.
for (int i = 0; i < count; i++)
{
HostMemoryAllocation existing = allocations[i];
if (start >= existing.Start && end <= existing.End)
{
try
{
existing.Allocation.IncrementReferenceCount();
return true;
}
catch (InvalidOperationException)
{
// Can throw if the allocation has been disposed.
// Just continue the search if this happens.
}
}
}
nint pageAlignedPointer = BitUtils.AlignDown(pointer, Environment.SystemPageSize);
nint pageAlignedEnd = BitUtils.AlignUp((nint)((ulong)pointer + size), Environment.SystemPageSize);
ulong pageAlignedSize = (ulong)(pageAlignedEnd - pageAlignedPointer);
Result getResult = _hostMemoryApi.GetMemoryHostPointerProperties(_device, ExternalMemoryHandleTypeFlags.HostAllocationBitExt, (void*)pageAlignedPointer, out MemoryHostPointerPropertiesEXT properties);
if (getResult < Result.Success)
{
return false;
}
int memoryTypeIndex = _allocator.FindSuitableMemoryTypeIndex(properties.MemoryTypeBits & requirements.MemoryTypeBits, flags);
if (memoryTypeIndex < 0)
{
return false;
}
ImportMemoryHostPointerInfoEXT importInfo = new()
{
SType = StructureType.ImportMemoryHostPointerInfoExt,
HandleType = ExternalMemoryHandleTypeFlags.HostAllocationBitExt,
PHostPointer = (void*)pageAlignedPointer,
};
var memoryAllocateInfo = new MemoryAllocateInfo
{
SType = StructureType.MemoryAllocateInfo,
AllocationSize = pageAlignedSize,
MemoryTypeIndex = (uint)memoryTypeIndex,
PNext = &importInfo,
};
Result result = _api.AllocateMemory(_device, in memoryAllocateInfo, null, out var deviceMemory);
if (result < Result.Success)
{
Logger.Debug?.PrintMsg(LogClass.Gpu, $"Host mapping import 0x{pageAlignedPointer:x16} 0x{pageAlignedSize:x8} failed.");
return false;
}
var allocation = new MemoryAllocation(this, deviceMemory, pageAlignedPointer, 0, pageAlignedSize);
var allocAuto = new Auto<MemoryAllocation>(allocation);
var hostAlloc = new HostMemoryAllocation(allocAuto, pageAlignedPointer, pageAlignedSize);
allocAuto.IncrementReferenceCount();
allocAuto.Dispose(); // Kept alive by ref count only.
// Register this mapping for future use.
_allocationTree.Add(hostAlloc.Start, hostAlloc.End, hostAlloc);
_allocations.Add(hostAlloc);
}
return true;
}
public (Auto<MemoryAllocation>, ulong) GetExistingAllocation(IntPtr pointer, ulong size)
{
lock (_lock)
{
// Does a compatible allocation exist in the tree?
var allocations = new HostMemoryAllocation[10];
ulong start = (ulong)pointer;
ulong end = start + size;
int count = _allocationTree.Get(start, end, ref allocations);
// A compatible range is one that where the start and end completely cover the requested range.
for (int i = 0; i < count; i++)
{
HostMemoryAllocation existing = allocations[i];
if (start >= existing.Start && end <= existing.End)
{
return (existing.Allocation, start - existing.Start);
}
}
throw new InvalidOperationException($"No host allocation was prepared for requested range 0x{pointer:x16}:0x{size:x16}.");
}
}
public void Free(DeviceMemory memory, ulong offset, ulong size)
{
lock (_lock)
{
_allocations.RemoveAll(allocation =>
{
if (allocation.Allocation.GetUnsafe().Memory.Handle == memory.Handle)
{
_allocationTree.Remove(allocation.Start, allocation);
return true;
}
return false;
});
}
_api.FreeMemory(_device, memory, ReadOnlySpan<AllocationCallbacks>.Empty);
}
}
}
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