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Kernel: Support multiport for VirtIOConsole

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This involves refactoring VirtIOConsole into VirtIOConsole and
VirtIOConsolePort. VirtIOConsole is the VirtIODevice, it owns multiple
VirtIOConsolePorts as well as two control queues. Each
VirtIOConsolePort is a CharacterDevice.
This commit is contained in:
x-yl 2021-06-23 15:19:24 +04:00 • committed by Ali Mohammad Pur
parent 1492bb2fd6
commit 1fe08759e3
6 changed files with 419 additions and 126 deletions
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63
Kernel/VirtIO/VirtIOConsolePort.h Normal file
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/*
* Copyright (c) 2021, the SerenityOS developers.
* Copyright (c) 2021, Kyle Pereira <hey@xylepereira.me>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <Kernel/Devices/CharacterDevice.h>
#include <Kernel/FileSystem/FileDescription.h>
#include <Kernel/VM/RingBuffer.h>
#include <Kernel/VirtIO/VirtIO.h>
namespace Kernel {
class VirtIOConsole;
#define VIRTIO_CONSOLE_F_SIZE (1 << 0)
#define VIRTIO_CONSOLE_F_MULTIPORT (1 << 1)
#define VIRTIO_CONSOLE_F_EMERG_WRITE (1 << 2)
class VirtIOConsolePort
: public CharacterDevice {
public:
explicit VirtIOConsolePort(unsigned port, VirtIOConsole&);
void handle_queue_update(Badge<VirtIOConsole>, u16 queue_index);
void set_open(Badge<VirtIOConsole>, bool state) { m_open = state; }
bool is_open() const { return m_open; }
private:
constexpr static size_t RINGBUFFER_SIZE = 2 * PAGE_SIZE;
virtual const char* class_name() const override { return "VirtIOConsolePort"; }
virtual bool can_read(const FileDescription&, size_t) const override;
virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual bool can_write(const FileDescription&, size_t) const override;
virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
virtual KResultOr<NonnullRefPtr<FileDescription>> open(int options) override;
mode_t required_mode() const override { return 0666; }
String device_name() const override;
void init_receive_buffer();
static unsigned next_device_id;
u16 m_receive_queue {};
u16 m_transmit_queue {};
OwnPtr<RingBuffer> m_receive_buffer;
OwnPtr<RingBuffer> m_transmit_buffer;
VirtIOConsole& m_console;
unsigned m_port;
bool m_open { false };
Atomic<bool> m_receive_buffer_exhausted;
};
}