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Kernel: Move AHCIPort::ScatterList to VM::ScatterGatherList
We want to move this out of the AHCI subsystem into the VM system, since other parts of the kernel may need to perform scatter-gather IO. We rename the current VM::ScatterGatherList impl that's used in the virtio subsystem to VM::ScatterGatherRefList, since its distinguishing feature from the AHCI scatter-gather list is that it doesn't own its buffers.
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11 changed files with 53 additions and 46 deletions
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@ -7,21 +7,40 @@
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#pragma once
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#include <AK/Vector.h>
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#include <Kernel/Devices/BlockDevice.h>
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#include <Kernel/PhysicalAddress.h>
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#include <Kernel/VM/AnonymousVMObject.h>
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#include <Kernel/VM/MemoryManager.h>
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namespace Kernel {
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class ScatterGatherList {
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struct ScatterGatherEntry {
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/// A Scatter-Gather List type that owns its buffers
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class ScatterGatherList : public RefCounted<ScatterGatherList> {
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public:
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static NonnullRefPtr<ScatterGatherList> create(AsyncBlockDeviceRequest&, NonnullRefPtrVector<PhysicalPage> allocated_pages, size_t device_block_size);
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const VMObject& 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(AsyncBlockDeviceRequest&, NonnullRefPtrVector<PhysicalPage> allocated_pages, size_t device_block_size);
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NonnullRefPtr<AnonymousVMObject> m_vm_object;
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OwnPtr<Region> m_dma_region;
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};
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/// A Scatter-Gather List type that doesn't own its buffers
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class ScatterGatherRefList {
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struct ScatterGatherRef {
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FlatPtr page_base;
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size_t offset;
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size_t length;
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};
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public:
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static ScatterGatherList create_from_buffer(const u8* buffer, size_t);
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static ScatterGatherList create_from_physical(PhysicalAddress, size_t);
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static ScatterGatherRefList create_from_buffer(const u8* buffer, size_t);
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static ScatterGatherRefList create_from_physical(PhysicalAddress, size_t);
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void add_entry(FlatPtr, size_t offset, size_t size);
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[[nodiscard]] size_t length() const { return m_entries.size(); }
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@ -29,7 +48,7 @@ public:
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void for_each_entry(Function<void(const FlatPtr, const size_t)> callback) const;
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private:
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Vector<ScatterGatherEntry> m_entries;
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Vector<ScatterGatherRef> m_entries;
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};
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}
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