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https://github.com/RGBCube/serenity
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3fb289e27d
Instead, hold the lock while we copy the contents to a stack-based Vector then iterate on it without any locking. Because we rely on heap allocations, we need to propagate errors back in case of OOM condition, therefore, both PCI::enumerate API function and PCI::Access::add_host_controller_and_enumerate_attached_devices use now a ErrorOr<void> return value to propagate errors. OOM Error can only occur when enumerating the m_device_identifiers vector under a spinlock and trying to expand the temporary Vector which will be used locklessly to actually iterate over the PCI::DeviceIdentifiers objects.
85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
/*
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Singleton.h>
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#include <Kernel/Bus/PCI/API.h>
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#include <Kernel/Bus/PCI/IDs.h>
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#include <Kernel/Devices/Audio/AC97.h>
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#include <Kernel/Devices/Audio/Management.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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static Singleton<AudioManagement> s_the;
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static Atomic<u32> s_device_minor_number;
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MajorNumber AudioManagement::audio_type_major_number()
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{
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return 116;
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}
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MinorNumber AudioManagement::generate_storage_minor_number()
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{
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auto minor_number = s_device_minor_number.load();
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s_device_minor_number++;
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return minor_number;
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}
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AudioManagement& AudioManagement::the()
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{
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return *s_the;
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}
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UNMAP_AFTER_INIT AudioManagement::AudioManagement()
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{
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}
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UNMAP_AFTER_INIT void AudioManagement::enumerate_hardware_controllers()
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{
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if (!PCI::Access::is_disabled()) {
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MUST(PCI::enumerate([&](PCI::DeviceIdentifier const& device_identifier) {
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// Note: Only consider PCI audio controllers
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if (device_identifier.class_code().value() != to_underlying(PCI::ClassID::Multimedia)
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|| device_identifier.subclass_code().value() != to_underlying(PCI::Multimedia::SubclassID::AudioController))
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return;
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dbgln("AC97: found audio controller at {}", device_identifier.address());
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auto ac97_device = AC97::try_create(device_identifier);
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if (ac97_device.is_error()) {
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// FIXME: Propagate errors properly
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dbgln("AudioManagement: failed to initialize AC97 device: {}", ac97_device.error());
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return;
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}
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m_controllers_list.append(ac97_device.release_value());
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}));
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}
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}
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UNMAP_AFTER_INIT void AudioManagement::enumerate_hardware_audio_channels()
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{
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for (auto& controller : m_controllers_list)
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controller.detect_hardware_audio_channels({});
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}
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UNMAP_AFTER_INIT bool AudioManagement::initialize()
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{
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/* Explanation on the flow:
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* 1. Enumerate all audio controllers connected to the system:
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* a. Try to find the SB16 ISA-based controller.
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* b. Enumerate the PCI bus and try to find audio controllers there too
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* 2. Ask each controller to detect the audio channels and instantiate AudioChannel objects.
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*/
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enumerate_hardware_controllers();
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enumerate_hardware_audio_channels();
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if (m_controllers_list.is_empty()) {
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dbgln("No audio controller was initialized.");
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return false;
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}
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return true;
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}
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}
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