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Ensure mappings are always aligned to big page size when deallocated and

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mapped

Since we align up when allocating, not doing so when deallocating would result in a gradual buildup of boundary pages that eventually fill the whole address space.
This commit is contained in:
Billy Laws 2023-01-29 22:18:31 +00:00
parent d659b4f55e
commit 94ac457ce0
1 changed files with 6 additions and 4 deletions
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10
app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/as_gpu.cpp
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@ -93,8 +93,9 @@ namespace skyline::service::nvdrv::device::nvhost {
if (!mapping->fixed) {
auto &allocator{mapping->bigPage ? *vm.bigPageAllocator : *vm.smallPageAllocator};
u32 pageSizeBits{mapping->bigPage ? vm.bigPageSizeBits : VM::PageSizeBits};
u32 pageSize{mapping->bigPage ? vm.bigPageSize : VM::PageSize};
allocator.Free(static_cast<u32>(mapping->offset >> pageSizeBits), static_cast<u32>(mapping->size >> pageSizeBits));
allocator.Free(static_cast<u32>(mapping->offset >> pageSizeBits), static_cast<u32>(util::AlignUp(mapping->size, pageSize) >> pageSizeBits));
}
// Sparse mappings shouldn't be fully unmapped, just returned to their sparse state
@ -128,8 +129,9 @@ namespace skyline::service::nvdrv::device::nvhost {
if (allocation.sparse)
asCtx->gmmu.Unmap(offset, allocation.size);
auto &allocator{pageSize == VM::PageSize ? *vm.smallPageAllocator : *vm.bigPageAllocator};
u32 pageSizeBits{pageSize == VM::PageSize ? VM::PageSizeBits : vm.bigPageSizeBits};
bool bigPage{pageSize != VM::PageSize};
auto &allocator{bigPage ? *vm.bigPageAllocator : *vm.smallPageAllocator};
u32 pageSizeBits{bigPage ? vm.bigPageSizeBits : VM::PageSizeBits};
allocator.Free(static_cast<u32>(offset >> pageSizeBits), static_cast<u32>(allocation.size >> pageSizeBits));
allocationMap.erase(offset);
@ -226,7 +228,7 @@ namespace skyline::service::nvdrv::device::nvhost {
if (!offset)
throw exception("Failed to allocate free space in the GPU AS!");
asCtx->gmmu.Map(offset, cpuPtr, size);
asCtx->gmmu.Map(offset, cpuPtr, util::AlignUp(size, pageSize));
auto mapping{std::make_shared<Mapping>(cpuPtr, offset, size, false, bigPage, false)};
mappingMap[offset] = mapping;