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Kernel: Move AHCIPort::ScatterList to VM::ScatterGatherList

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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.
This commit is contained in:
Sahan Fernando 2021-04-24 11:30:27 +10:00 • committed by Andreas Kling
parent b63b15eeb5
commit 8131c0de8c
11 changed files with 53 additions and 46 deletions
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29
Kernel/VM/ScatterGatherList.h
View file

@ -7,21 +7,40 @@
#pragma once
#include <AK/Vector.h>
#include <Kernel/Devices/BlockDevice.h>
#include <Kernel/PhysicalAddress.h>
#include <Kernel/VM/AnonymousVMObject.h>
#include <Kernel/VM/MemoryManager.h>
namespace Kernel {
class ScatterGatherList {
struct ScatterGatherEntry {
/// A Scatter-Gather List type that owns its buffers
class ScatterGatherList : public RefCounted<ScatterGatherList> {
public:
static NonnullRefPtr<ScatterGatherList> create(AsyncBlockDeviceRequest&, NonnullRefPtrVector<PhysicalPage> allocated_pages, size_t device_block_size);
const VMObject& vmobject() const { return m_vm_object; }
VirtualAddress dma_region() const { return m_dma_region->vaddr(); }
size_t scatters_count() const { return m_vm_object->physical_pages().size(); }
private:
ScatterGatherList(AsyncBlockDeviceRequest&, NonnullRefPtrVector<PhysicalPage> allocated_pages, size_t device_block_size);
NonnullRefPtr<AnonymousVMObject> m_vm_object;
OwnPtr<Region> m_dma_region;
};
/// A Scatter-Gather List type that doesn't own its buffers
class ScatterGatherRefList {
struct ScatterGatherRef {
FlatPtr page_base;
size_t offset;
size_t length;
};
public:
static ScatterGatherList create_from_buffer(const u8* buffer, size_t);
static ScatterGatherList create_from_physical(PhysicalAddress, size_t);
static ScatterGatherRefList create_from_buffer(const u8* buffer, size_t);
static ScatterGatherRefList create_from_physical(PhysicalAddress, size_t);
void add_entry(FlatPtr, size_t offset, size_t size);
[[nodiscard]] size_t length() const { return m_entries.size(); }
@ -29,7 +48,7 @@ public:
void for_each_entry(Function<void(const FlatPtr, const size_t)> callback) const;
private:
Vector<ScatterGatherEntry> m_entries;
Vector<ScatterGatherRef> m_entries;
};
}