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Kernel/PCI: Set IRQ as reserved for pin-based interrupts

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Set pin-based interrupt handler as reserved during PCI bus init.
This is required so that MSI(x) based interrupts can avoid sharing the
IRQ which has been marked as reserved.
This commit is contained in:
Pankaj Raghav 2023-04-28 14:07:03 +02:00 • committed by Jelle Raaijmakers
parent e5cc78e9db
commit a5ec5f07fa
1 changed files with 11 additions and 0 deletions
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11
Kernel/Arch/x86_64/PCI/Initializer.cpp
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@ -4,6 +4,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Arch/Interrupts.h>
#include <Kernel/Arch/x86_64/IO.h>
#include <Kernel/Bus/PCI/API.h>
#include <Kernel/Bus/PCI/Access.h>
@ -70,6 +71,16 @@ UNMAP_AFTER_INIT void initialize()
PCIBusSysFSDirectory::initialize();
// IRQ from pin-based interrupt should be set as reserved as soon as possible so that the PCI device
// that chooses to use MSI(x) based interrupt can avoid sharing the IRQ with other devices.
MUST(PCI::enumerate([&](DeviceIdentifier const& device_identifier) {
// A simple sanity check to avoid getting a panic in get_interrupt_handler() before setting the IRQ as reserved.
if (auto irq = device_identifier.interrupt_line().value(); irq < GENERIC_INTERRUPT_HANDLERS_COUNT) {
auto& handler = get_interrupt_handler(irq);
handler.set_reserved();
}
}));
MUST(PCI::enumerate([&](DeviceIdentifier const& device_identifier) {
dmesgln("{} {}", device_identifier.address(), device_identifier.hardware_id());
}));