Kernel: Add MSI support to AHCI

Add MSI support to AHCI. Prefer MSI interrupts over pin-based
interrupts.

Kernel/Storage/ATA/AHCI/Controller.cpp

@@ -167,12 +167,13 @@ UNMAP_AFTER_INIT ErrorOr<void> AHCIController::initialize_hba(PCI::DeviceIdentif
     u32 version = hba().control_regs.version;
 
     hba().control_regs.ghc = 0x80000000; // Ensure that HBA knows we are AHCI aware.
-    PCI::enable_interrupt_line(device_identifier());
     PCI::enable_bus_mastering(device_identifier());
+    TRY(reserve_irqs(1, true));
+    auto irq = MUST(allocate_irq(0));
     enable_global_interrupts();
 
     auto implemented_ports = AHCI::MaskedBitField((u32 volatile&)(hba().control_regs.pi));
-    m_irq_handler = AHCIInterruptHandler::create(*this, pci_device_identifier.interrupt_line().value(), implemented_ports).release_value_but_fixme_should_propagate_errors();
+    m_irq_handler = AHCIInterruptHandler::create(*this, irq, implemented_ports).release_value_but_fixme_should_propagate_errors();
     TRY(reset());
 
     dbgln_if(AHCI_DEBUG, "{}: AHCI Controller Version = {:#08x}", device_identifier().address(), version);

Kernel/Storage/ATA/AHCI/InterruptHandler.cpp

@@ -23,7 +23,7 @@ void AHCIInterruptHandler::allocate_resources_and_initialize_ports()
 }
 
 UNMAP_AFTER_INIT AHCIInterruptHandler::AHCIInterruptHandler(AHCIController& controller, u8 irq, AHCI::MaskedBitField taken_ports)
-    : IRQHandler(irq)
+    : PCIIRQHandler(controller, irq)
     , m_parent_controller(controller)
     , m_taken_ports(taken_ports)
     , m_pending_ports_interrupts(create_pending_ports_interrupts_bitfield())

Kernel/Storage/ATA/AHCI/InterruptHandler.h

@@ -7,7 +7,7 @@
 #pragma once
 
 #include <Kernel/Devices/Device.h>
-#include <Kernel/Interrupts/IRQHandler.h>
+#include <Kernel/Interrupts/PCIIRQHandler.h>
 #include <Kernel/Library/LockRefPtr.h>
 #include <Kernel/Locking/Mutex.h>
 #include <Kernel/Memory/PhysicalPage.h>
@@ -25,7 +25,7 @@ class AsyncBlockDeviceRequest;
 
 class AHCIController;
 class AHCIPort;
-class AHCIInterruptHandler final : public IRQHandler {
+class AHCIInterruptHandler final : public PCIIRQHandler {
     friend class AHCIController;
 
 public: