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https://github.com/RGBCube/serenity
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2c72d495a3
I believe this to be safe, as the main thing that LockRefPtr provides over RefPtr is safe copying from a shared LockRefPtr instance. I've inspected the uses of RefPtr<PhysicalPage> and it seems they're all guarded by external locking. Some of it is less obvious, but this is an area where we're making continuous headway.
33 lines
1.1 KiB
C++
33 lines
1.1 KiB
C++
/*
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* Copyright (c) 2021, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/AtomicRefCounted.h>
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#include <AK/Vector.h>
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#include <Kernel/Devices/BlockDevice.h>
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#include <Kernel/Memory/AnonymousVMObject.h>
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#include <Kernel/Memory/MemoryManager.h>
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#include <Kernel/PhysicalAddress.h>
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namespace Kernel::Memory {
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// A Scatter-Gather List type that owns its buffers
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class ScatterGatherList final : public AtomicRefCounted<ScatterGatherList> {
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public:
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static LockRefPtr<ScatterGatherList> try_create(AsyncBlockDeviceRequest&, Span<NonnullRefPtr<PhysicalPage>> allocated_pages, size_t device_block_size);
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VMObject const& vmobject() const { return m_vm_object; }
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VirtualAddress dma_region() const { return m_dma_region->vaddr(); }
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size_t scatters_count() const { return m_vm_object->physical_pages().size(); }
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private:
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ScatterGatherList(NonnullLockRefPtr<AnonymousVMObject>, AsyncBlockDeviceRequest&, size_t device_block_size);
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NonnullLockRefPtr<AnonymousVMObject> m_vm_object;
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OwnPtr<Region> m_dma_region;
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};
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}
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