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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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23
Kernel/VM/ScatterGatherList.cpp
View file

@ -8,10 +8,21 @@
namespace Kernel {
ScatterGatherList ScatterGatherList::create_from_buffer(const u8* buffer, size_t size)
NonnullRefPtr<ScatterGatherList> ScatterGatherList::create(AsyncBlockDeviceRequest& request, NonnullRefPtrVector<PhysicalPage> allocated_pages, size_t device_block_size)
{
return adopt_ref(*new ScatterGatherList(request, allocated_pages, device_block_size));
}
ScatterGatherList::ScatterGatherList(AsyncBlockDeviceRequest& request, NonnullRefPtrVector<PhysicalPage> allocated_pages, size_t device_block_size)
: m_vm_object(AnonymousVMObject::create_with_physical_pages(allocated_pages))
{
m_dma_region = MM.allocate_kernel_region_with_vmobject(m_vm_object, page_round_up((request.block_count() * device_block_size)), "AHCI Scattered DMA", Region::Access::Read | Region::Access::Write, Region::Cacheable::Yes);
}
ScatterGatherRefList ScatterGatherRefList::create_from_buffer(const u8* buffer, size_t size)
{
VERIFY(buffer && size);
ScatterGatherList new_list;
ScatterGatherRefList new_list;
auto* region = MM.find_region_from_vaddr(VirtualAddress(buffer));
VERIFY(region);
while (size > 0) {
@ -25,20 +36,20 @@ ScatterGatherList ScatterGatherList::create_from_buffer(const u8* buffer, size_t
return new_list;
}
ScatterGatherList ScatterGatherList::create_from_physical(PhysicalAddress paddr, size_t size)
ScatterGatherRefList ScatterGatherRefList::create_from_physical(PhysicalAddress paddr, size_t size)
{
VERIFY(!paddr.is_null() && size);
ScatterGatherList new_list;
ScatterGatherRefList new_list;
new_list.add_entry(paddr.page_base().get(), paddr.offset_in_page(), size);
return new_list;
}
void ScatterGatherList::add_entry(FlatPtr addr, size_t offset, size_t size)
void ScatterGatherRefList::add_entry(FlatPtr addr, size_t offset, size_t size)
{
m_entries.append({ addr, offset, size });
}
void ScatterGatherList::for_each_entry(Function<void(const FlatPtr, const size_t)> callback) const
void ScatterGatherRefList::for_each_entry(Function<void(const FlatPtr, const size_t)> callback) const
{
for (auto& entry : m_entries)
callback(entry.page_base + entry.offset, entry.length);