mirror of
https://github.com/RGBCube/serenity
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7718842829
Simplify core methods in the VirtIO bus handling code by ensuring proper error propagation. This makes initialization of queues, handling changes in device configuration, and other core patterns more readable as well. It also allows us to remove the obnoxious pattern of checking for boolean "success" and if we get false answer then returning an actual errno code.
80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
/*
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* Copyright (c) 2021, Kyle Pereira <hey@xylepereira.me>
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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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#pragma once
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#include <Kernel/Bus/VirtIO/ConsolePort.h>
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#include <Kernel/Bus/VirtIO/Device.h>
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#include <Kernel/Memory/RingBuffer.h>
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namespace Kernel::VirtIO {
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class Console
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: public VirtIO::Device
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, public AtomicRefCounted<Console> {
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friend VirtIO::ConsolePort;
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public:
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static NonnullLockRefPtr<Console> must_create_for_pci_instance(PCI::DeviceIdentifier const&);
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virtual ~Console() override = default;
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unsigned device_id() const
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{
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return m_device_id;
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}
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virtual ErrorOr<void> initialize_virtio_resources() override;
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private:
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virtual StringView class_name() const override { return "VirtIOConsole"sv; }
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explicit Console(NonnullOwnPtr<TransportEntity>);
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enum class ControlEvent : u16 {
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DeviceReady = 0,
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DeviceAdd = 1,
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PortReady = 3,
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ConsolePort = 4,
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PortOpen = 6,
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};
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struct [[gnu::packed]] ControlMessage {
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u32 id;
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u16 event;
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u16 value;
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enum class Status : u16 {
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Success = 1,
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Failure = 0
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};
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enum class PortStatus : u16 {
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Open = 1,
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Close = 0
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};
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};
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constexpr static u16 CONTROL_RECEIVEQ = 2;
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constexpr static u16 CONTROL_TRANSMITQ = 3;
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constexpr static size_t CONTROL_MESSAGE_SIZE = sizeof(ControlMessage);
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constexpr static size_t CONTROL_BUFFER_SIZE = CONTROL_MESSAGE_SIZE * 32;
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virtual ErrorOr<void> handle_device_config_change() override;
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virtual void handle_queue_update(u16 queue_index) override;
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Vector<LockRefPtr<ConsolePort>> m_ports;
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void setup_multiport();
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void process_control_message(ControlMessage message);
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void write_control_message(ControlMessage message);
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void send_open_control_message(unsigned port_number, bool open);
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unsigned m_device_id;
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OwnPtr<Memory::RingBuffer> m_control_transmit_buffer;
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OwnPtr<Memory::RingBuffer> m_control_receive_buffer;
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WaitQueue m_control_wait_queue;
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static unsigned next_device_id;
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};
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}
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