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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.
53 lines
1.8 KiB
C++
53 lines
1.8 KiB
C++
/*
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* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Bus/PCI/API.h>
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#include <Kernel/Devices/PCISerialDevice.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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static SerialDevice* s_the = nullptr;
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UNMAP_AFTER_INIT void PCISerialDevice::detect()
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{
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size_t current_device_minor = 68;
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MUST(PCI::enumerate([&](PCI::DeviceIdentifier const& device_identifier) {
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for (auto& board_definition : board_definitions) {
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if (board_definition.device_id != device_identifier.hardware_id())
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continue;
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auto bar_base = PCI::get_BAR(device_identifier.address(), board_definition.pci_bar) & ~1;
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auto port_base = IOAddress(bar_base + board_definition.first_offset);
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for (size_t i = 0; i < board_definition.port_count; i++) {
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auto serial_device = new SerialDevice(port_base.offset(board_definition.port_size * i), current_device_minor++);
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if (board_definition.baud_rate != SerialDevice::Baud::Baud38400) // non-default baud
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serial_device->set_baud(board_definition.baud_rate);
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// If this is the first port of the first pci serial device, store it as the debug PCI serial port (TODO: Make this configurable somehow?)
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if (!is_available())
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s_the = serial_device;
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// NOTE: We intentionally leak the reference to serial_device here.
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}
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dmesgln("PCISerialDevice: Found {} @ {}", board_definition.name, device_identifier.address());
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return;
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}
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}));
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}
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SerialDevice& PCISerialDevice::the()
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{
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VERIFY(s_the);
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return *s_the;
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}
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bool PCISerialDevice::is_available()
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{
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return s_the;
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}
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}
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