Refactor interrupt remapping in OSTD

ostd/src/arch/riscv/irq.rs

@@ -83,6 +83,14 @@ impl IrqLine {
         Arc::new(IRQ_LIST.get().unwrap().get(irq_num as usize).unwrap())
     }
 
+    /// Gets the remapping index of the IRQ line.
+    ///
+    /// This method will return `None` if interrupt remapping is disabled or
+    /// not supported by the architecture.
+    pub fn remapping_index(&self) -> Option<u16> {
+        None
+    }
+
     /// Get the IRQ number.
     pub fn num(&self) -> u8 {
         self.irq_num

ostd/src/arch/riscv/pci.rs

@@ -6,9 +6,7 @@ use log::warn;
 use spin::Once;
 
 use super::boot::DEVICE_TREE;
-use crate::{
-    bus::pci::PciDeviceLocation, io::IoMem, mm::VmIoOnce, prelude::*, trap::IrqLine, Error,
-};
+use crate::{bus::pci::PciDeviceLocation, io::IoMem, mm::VmIoOnce, prelude::*, Error};
 
 static PCI_BASE_ADDR: Once<IoMem> = Once::new();
 
@@ -64,7 +62,7 @@ pub(crate) fn init() -> Result<()> {
 
 pub(crate) const MSIX_DEFAULT_MSG_ADDR: u32 = 0x2400_0000;
 
-pub(crate) fn construct_remappable_msix_address(irq: &IrqLine) -> u32 {
+pub(crate) fn construct_remappable_msix_address(remapping_index: u32) -> u32 {
     unimplemented!()
 }
 

ostd/src/arch/x86/iommu/mod.rs

@@ -9,7 +9,9 @@ mod invalidate;
 mod registers;
 
 pub(crate) use dma_remapping::{has_dma_remapping, map, unmap};
-pub(crate) use interrupt_remapping::{alloc_irt_entry, has_interrupt_remapping, IrtEntryHandle};
+pub(in crate::arch) use interrupt_remapping::{
+    alloc_irt_entry, has_interrupt_remapping, IrtEntryHandle,
+};
 
 use crate::{io::IoMemAllocatorBuilder, mm::page_table::PageTableError};
 

ostd/src/arch/x86/irq.rs

@@ -104,14 +104,24 @@ impl IrqLine {
         if has_interrupt_remapping() {
             let handle = alloc_irt_entry();
             if let Some(handle) = handle {
+                // Enable the IRT entry
+                handle
+                    .lock()
+                    .irt_entry_mut()
+                    .unwrap()
+                    .enable_default(irq_num as u32);
                 irq.bind_remapping_entry.call_once(|| handle);
             }
         }
         irq
     }
 
-    pub fn bind_remapping_entry(&self) -> Option<&Arc<SpinLock<IrtEntryHandle, LocalIrqDisabled>>> {
-        self.bind_remapping_entry.get()
+    /// Gets the remapping index of the IRQ line.
+    ///
+    /// This method will return `None` if interrupt remapping is disabled or
+    /// not supported by the architecture.
+    pub fn remapping_index(&self) -> Option<u16> {
+        Some(self.bind_remapping_entry.get()?.lock().index())
     }
 
     /// Gets the IRQ number.

ostd/src/arch/x86/kernel/apic/ioapic.rs

@@ -15,7 +15,7 @@ use volatile::{
 };
 
 use crate::{
-    arch::{if_tdx_enabled, iommu::has_interrupt_remapping, kernel::acpi::get_platform_info},
+    arch::{if_tdx_enabled, kernel::acpi::get_platform_info},
     io::IoMemAllocatorBuilder,
     mm::paddr_to_vaddr,
     sync::SpinLock,
@@ -54,19 +54,14 @@ impl IoApic {
         if value.get_bits(0..8) as u8 != 0 {
             return Err(Error::AccessDenied);
         }
-        if has_interrupt_remapping() {
-            let mut handle = irq.inner_irq().bind_remapping_entry().unwrap().lock();
-
-            // Enable irt entry
-            let irt_entry_mut = handle.irt_entry_mut().unwrap();
-            irt_entry_mut.enable_default(irq.num() as u32);
 
+        if let Some(remapping_index) = irq.remapping_index() {
             // Construct remappable format RTE with RTE[48] set.
             let mut value: u64 = irq.num() as u64 | 0x1_0000_0000_0000;
 
             // Interrupt index[14:0] is on RTE[63:49] and interrupt index[15] is on RTE[11].
-            value |= ((handle.index() & 0x8000) >> 4) as u64;
-            value |= (handle.index() as u64 & 0x7FFF) << 49;
+            value |= ((remapping_index & 0x8000) >> 4) as u64;
+            value |= (remapping_index as u64 & 0x7FFF) << 49;
 
             self.access.write(
                 Self::TABLE_REG_BASE + 2 * index,
@@ -76,15 +71,12 @@ impl IoApic {
                 Self::TABLE_REG_BASE + 2 * index + 1,
                 value.get_bits(32..64) as u32,
             );
-
-            drop(handle);
-            self.irqs.push(irq);
-            return Ok(());
-        }
-
+        } else {
             self.access
                 .write(Self::TABLE_REG_BASE + 2 * index, irq.num() as u32);
             self.access.write(Self::TABLE_REG_BASE + 2 * index + 1, 0);
+        }
+
         self.irqs.push(irq);
         Ok(())
     }

ostd/src/arch/x86/pci.rs

@@ -3,7 +3,7 @@
 //! PCI bus access
 
 use super::device::io_port::{ReadWriteAccess, WriteOnlyAccess};
-use crate::{bus::pci::PciDeviceLocation, io::IoPort, prelude::*, trap::IrqLine};
+use crate::{bus::pci::PciDeviceLocation, io::IoPort, prelude::*};
 
 static PCI_ADDRESS_PORT: IoPort<u32, WriteOnlyAccess> = unsafe { IoPort::new(0x0CF8) };
 static PCI_DATA_PORT: IoPort<u32, ReadWriteAccess> = unsafe { IoPort::new(0x0CFC) };
@@ -27,19 +27,13 @@ pub(crate) fn has_pci_bus() -> bool {
 
 pub(crate) const MSIX_DEFAULT_MSG_ADDR: u32 = 0xFEE0_0000;
 
-pub(crate) fn construct_remappable_msix_address(irq: &IrqLine) -> u32 {
-    let mut handle = irq.inner_irq().bind_remapping_entry().unwrap().lock();
-
-    // Enable irt entry
-    let irt_entry_mut = handle.irt_entry_mut().unwrap();
-    irt_entry_mut.enable_default(irq.num() as u32);
-
+pub(crate) fn construct_remappable_msix_address(remapping_index: u32) -> u32 {
     // Use remappable format. The bits[4:3] should be always set to 1 according to the manual.
     let mut address = MSIX_DEFAULT_MSG_ADDR | 0b1_1000;
 
     // Interrupt index[14:0] is on address[19:5] and interrupt index[15] is on address[2].
-    address |= (handle.index() as u32 & 0x7FFF) << 5;
-    address |= (handle.index() as u32 & 0x8000) >> 13;
+    address |= (remapping_index & 0x7FFF) << 5;
+    address |= (remapping_index & 0x8000) >> 13;
 
     address
 }

ostd/src/bus/pci/capability/msix.rs

@@ -8,10 +8,7 @@
 use alloc::{sync::Arc, vec::Vec};
 
 use crate::{
-    arch::{
-        iommu::has_interrupt_remapping,
-        pci::{construct_remappable_msix_address, MSIX_DEFAULT_MSG_ADDR},
-    },
+    arch::pci::{construct_remappable_msix_address, MSIX_DEFAULT_MSG_ADDR},
     bus::pci::{
         cfg_space::{Bar, Command, MemoryBar},
         common_device::PciCommonDevice,
@@ -150,8 +147,8 @@ impl CapabilityMsixData {
         }
 
         // If interrupt remapping is enabled, then we need to change the value of the message address.
-        if has_interrupt_remapping() {
-            let address = construct_remappable_msix_address(&irq);
+        if let Some(remapping_index) = irq.remapping_index() {
+            let address = construct_remappable_msix_address(remapping_index as u32);
 
             self.table_bar
                 .io_mem()

ostd/src/trap/irq.rs

@@ -80,8 +80,12 @@ impl IrqLine {
         self.callbacks.is_empty()
     }
 
-    pub(crate) fn inner_irq(&self) -> &'static irq::IrqLine {
-        &self.inner_irq
+    /// Gets the remapping index of the IRQ line.
+    ///
+    /// This method will return `None` if interrupt remapping is disabled or
+    /// not supported by the architecture.
+    pub fn remapping_index(&self) -> Option<u16> {
+        self.inner_irq.remapping_index()
     }
 }