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/*
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/HashTable.h>
#include <AK/Singleton.h>
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/FileSystem/InodeMetadata.h>
#include <Kernel/Sections.h>
namespace Kernel {
static Singleton<DeviceManagement> s_the;
UNMAP_AFTER_INIT DeviceManagement::DeviceManagement()
{
}
UNMAP_AFTER_INIT void DeviceManagement::initialize()
{
s_the.ensure_instance();
}
UNMAP_AFTER_INIT void DeviceManagement::attach_console_device(ConsoleDevice const& device)
{
m_console_device = device;
}
UNMAP_AFTER_INIT void DeviceManagement::attach_null_device(NullDevice const& device)
{
m_null_device = device;
}
UNMAP_AFTER_INIT void DeviceManagement::attach_device_control_device(DeviceControlDevice const& device)
{
m_device_control_device = device;
}
DeviceManagement& DeviceManagement::the()
{
return *s_the;
}
Device* DeviceManagement::get_device(MajorNumber major, MinorNumber minor)
{
return m_devices.with([&](auto& map) -> Device* {
auto it = map.find(encoded_device(major.value(), minor.value()));
if (it == map.end())
return nullptr;
return it->value;
});
}
Optional<DeviceEvent> DeviceManagement::dequeue_top_device_event(Badge<DeviceControlDevice>)
{
SpinlockLocker locker(m_event_queue_lock);
if (m_event_queue.is_empty())
return {};
return m_event_queue.dequeue();
}
void DeviceManagement::before_device_removal(Badge<Device>, Device& device)
{
u64 device_id = encoded_device(device.major(), device.minor());
m_devices.with([&](auto& map) -> void {
VERIFY(map.contains(device_id));
map.remove(encoded_device(device.major(), device.minor()));
});
{
DeviceEvent event { DeviceEvent::State::Removed, device.is_block_device(), device.major().value(), device.minor().value() };
SpinlockLocker locker(m_event_queue_lock);
m_event_queue.enqueue(event);
}
if (m_device_control_device)
m_device_control_device->evaluate_block_conditions();
}
void DeviceManagement::after_inserting_device(Badge<Device>, Device& device)
{
u64 device_id = encoded_device(device.major(), device.minor());
m_devices.with([&](auto& map) -> void {
if (map.contains(device_id)) {
dbgln("Already registered {},{}: {}", device.major(), device.minor(), device.class_name());
VERIFY_NOT_REACHED();
}
auto result = map.set(device_id, &device);
if (result != AK::HashSetResult::InsertedNewEntry) {
dbgln("Failed to register {},{}: {}", device.major(), device.minor(), device.class_name());
VERIFY_NOT_REACHED();
}
});
{
DeviceEvent event { DeviceEvent::State::Inserted, device.is_block_device(), device.major().value(), device.minor().value() };
SpinlockLocker locker(m_event_queue_lock);
m_event_queue.enqueue(event);
}
if (m_device_control_device)
m_device_control_device->evaluate_block_conditions();
}
void DeviceManagement::for_each(Function<void(Device&)> callback)
{
m_devices.with([&](auto& map) -> void {
for (auto& entry : map)
callback(*entry.value);
});
}
ErrorOr<void> DeviceManagement::try_for_each(Function<ErrorOr<void>(Device&)> callback)
{
return m_devices.with([&](auto& map) -> ErrorOr<void> {
for (auto& entry : map)
TRY(callback(*entry.value));
return {};
});
}
NullDevice& DeviceManagement::null_device()
{
return *m_null_device;
}
NullDevice const& DeviceManagement::null_device() const
{
return *m_null_device;
}
ConsoleDevice const& DeviceManagement::console_device() const
{
return *m_console_device;
}
ConsoleDevice& DeviceManagement::console_device()
{
return *m_console_device;
}
}
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