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https://github.com/RGBCube/serenity
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8131c0de8c
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.
107 lines
3.7 KiB
C++
107 lines
3.7 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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#include <Kernel/VM/ScatterGatherList.h>
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#include <Kernel/VirtIO/VirtIOConsole.h>
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namespace Kernel {
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unsigned VirtIOConsole::next_device_id = 0;
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VirtIOConsole::VirtIOConsole(PCI::Address address)
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: CharacterDevice(229, next_device_id++)
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, VirtIODevice(address, "VirtIOConsole")
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{
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if (auto cfg = get_config(ConfigurationType::Device)) {
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bool success = negotiate_features([&](u64 supported_features) {
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u64 negotiated = 0;
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if (is_feature_set(supported_features, VIRTIO_CONSOLE_F_SIZE))
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dbgln("VirtIOConsole: Console size is not yet supported!");
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if (is_feature_set(supported_features, VIRTIO_CONSOLE_F_MULTIPORT))
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dbgln("VirtIOConsole: Multi port is not yet supported!");
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return negotiated;
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});
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if (success) {
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u32 max_nr_ports = 0;
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u16 cols = 0, rows = 0;
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read_config_atomic([&]() {
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if (is_feature_accepted(VIRTIO_CONSOLE_F_SIZE)) {
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cols = config_read16(*cfg, 0x0);
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rows = config_read16(*cfg, 0x2);
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}
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if (is_feature_accepted(VIRTIO_CONSOLE_F_MULTIPORT)) {
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max_nr_ports = config_read32(*cfg, 0x4);
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}
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});
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dbgln("VirtIOConsole: cols: {}, rows: {}, max nr ports {}", cols, rows, max_nr_ports);
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success = setup_queues(2 + max_nr_ports * 2); // base receiveq/transmitq for port0 + 2 per every additional port
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}
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if (success) {
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finish_init();
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m_receive_region = MM.allocate_contiguous_kernel_region(PAGE_SIZE, "VirtIOConsole Receive", Region::Access::Read | Region::Access::Write);
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if (m_receive_region) {
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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());
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}
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m_transmit_region = MM.allocate_contiguous_kernel_region(PAGE_SIZE, "VirtIOConsole Transmit", Region::Access::Read | Region::Access::Write);
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}
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}
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}
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VirtIOConsole::~VirtIOConsole()
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{
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}
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bool VirtIOConsole::handle_device_config_change()
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{
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dbgln("VirtIOConsole: Handle device config change");
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return true;
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}
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void VirtIOConsole::handle_queue_update(u16 queue_index)
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{
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VERIFY(queue_index <= TRANSMITQ);
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switch (queue_index) {
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case RECEIVEQ:
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get_queue(RECEIVEQ).discard_used_buffers(); // TODO: do something with incoming data (users writing into qemu console) instead of just clearing
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break;
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case TRANSMITQ:
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get_queue(TRANSMITQ).discard_used_buffers(); // clear outgoing buffers that the device finished with
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break;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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bool VirtIOConsole::can_read(const FileDescription&, size_t) const
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{
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return false;
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}
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KResultOr<size_t> VirtIOConsole::read(FileDescription&, u64, [[maybe_unused]] UserOrKernelBuffer& data, size_t size)
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{
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if (!size)
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return 0;
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return 1;
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}
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bool VirtIOConsole::can_write(const FileDescription&, size_t) const
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{
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return get_queue(TRANSMITQ).can_write();
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}
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KResultOr<size_t> VirtIOConsole::write(FileDescription&, u64, const UserOrKernelBuffer& data, size_t size)
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{
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if (!size)
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return 0;
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auto scatter_list = ScatterGatherRefList::create_from_buffer(static_cast<const u8*>(data.user_or_kernel_ptr()), size);
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supply_buffer_and_notify(TRANSMITQ, scatter_list, BufferType::DeviceReadable, const_cast<void*>(data.user_or_kernel_ptr()));
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return size;
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}
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}
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