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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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4
Kernel/VirtIO/VirtIOConsole.cpp
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@ -43,7 +43,7 @@ VirtIOConsole::VirtIOConsole(PCI::Address address)
finish_init();
m_receive_region = MM.allocate_contiguous_kernel_region(PAGE_SIZE, "VirtIOConsole Receive", Region::Access::Read | Region::Access::Write);
if (m_receive_region) {
supply_buffer_and_notify(RECEIVEQ, ScatterGatherList::create_from_physical(m_receive_region->physical_page(0)->paddr(), m_receive_region->size()), BufferType::DeviceWritable, m_receive_region->vaddr().as_ptr());
supply_buffer_and_notify(RECEIVEQ, ScatterGatherRefList::create_from_physical(m_receive_region->physical_page(0)->paddr(), m_receive_region->size()), BufferType::DeviceWritable, m_receive_region->vaddr().as_ptr());
}
m_transmit_region = MM.allocate_contiguous_kernel_region(PAGE_SIZE, "VirtIOConsole Transmit", Region::Access::Read | Region::Access::Write);
}
@ -98,7 +98,7 @@ KResultOr<size_t> VirtIOConsole::write(FileDescription&, u64, const UserOrKernel
if (!size)
return 0;
auto scatter_list = ScatterGatherList::create_from_buffer(static_cast<const u8*>(data.user_or_kernel_ptr()), size);
auto scatter_list = ScatterGatherRefList::create_from_buffer(static_cast<const u8*>(data.user_or_kernel_ptr()), size);
supply_buffer_and_notify(TRANSMITQ, scatter_list, BufferType::DeviceReadable, const_cast<void*>(data.user_or_kernel_ptr()));
return size;