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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/Singleton.h>
#include <Kernel/Devices/Device.h>
#include <Kernel/FileSystem/InodeMetadata.h>
#include <LibC/errno_numbers.h>
namespace Kernel {
static AK::Singleton<HashMap<u32, Device*>> s_all_devices;
HashMap<u32, Device*>& Device::all_devices()
{
return *s_all_devices;
}
void Device::for_each(Function<void(Device&)> callback)
{
for (auto& entry : all_devices())
callback(*entry.value);
}
Device* Device::get_device(unsigned major, unsigned minor)
{
auto it = all_devices().find(encoded_device(major, minor));
if (it == all_devices().end())
return nullptr;
return it->value;
}
Device::Device(unsigned major, unsigned minor)
: m_major(major)
, m_minor(minor)
{
u32 device_id = encoded_device(major, minor);
auto it = all_devices().find(device_id);
if (it != all_devices().end()) {
dbgln("Already registered {},{}: {}", major, minor, it->value->class_name());
}
ASSERT(!all_devices().contains(device_id));
all_devices().set(device_id, this);
}
Device::~Device()
{
all_devices().remove(encoded_device(m_major, m_minor));
}
String Device::absolute_path() const
{
return String::format("device:%u,%u (%s)", m_major, m_minor, class_name());
}
String Device::absolute_path(const FileDescription&) const
{
return absolute_path();
}
void Device::process_next_queued_request(Badge<AsyncDeviceRequest>, const AsyncDeviceRequest& completed_request)
{
AsyncDeviceRequest* next_request = nullptr;
{
ScopedSpinLock lock(m_requests_lock);
ASSERT(!m_requests.is_empty());
ASSERT(m_requests.first().ptr() == &completed_request);
m_requests.remove(m_requests.begin());
if (!m_requests.is_empty())
next_request = m_requests.first().ptr();
}
if (next_request)
next_request->start();
evaluate_block_conditions();
}
}
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