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kernel/x86: Add locking around IO-APIC register accesses.

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On SMP systems, we may call ioapic_assign_interrupt_to_cpu from
multiple CPUs at a time, at least under low-latency mode.

May fix #18588.

Change-Id: Ie76e4127b05a8abc5f411d7719997dcfff9c2ff0
Reviewed-on: https://review.haiku-os.org/c/haiku/+/11491
Reviewed-by: waddlesplash <[email protected]>
This commit is contained in:
Augustin Cavalier
2026-08-07 21:57:59 +00:00
committed by waddlesplash
parent 02fad68b15
commit d2fee32bba
1 changed files with 7 additions and 0 deletions
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src/system/kernel/arch/x86/ioapic.cpp
+7
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@@ -16,6 +16,7 @@
#include <string.h>
#include <stdio.h>
#include <cpu.h>
#include <util/AutoLock.h>
#include <arch/x86/apic.h>
#include <arch/x86/arch_int.h>
@@ -102,6 +103,7 @@ struct ioapic {
uint64 level_triggered_mask;
uint64 nmi_mask;
spinlock registers_lock;
area_id register_area;
ioapic_registers* registers;
@@ -254,6 +256,7 @@ ioapic_assign_interrupt_to_cpu(int32 gsi, int32 cpu)
struct ioapic* ioapic = find_ioapic(gsi);
if (ioapic == NULL)
return;
SpinLocker _(ioapic->registers_lock);
uint32 apicid = x86_get_cpu_apic_id(cpu);
@@ -282,6 +285,7 @@ ioapic_enable_io_interrupt(int32 gsi)
struct ioapic* ioapic = find_ioapic(gsi);
if (ioapic == NULL)
return;
SpinLocker _(ioapic->registers_lock);
x86_set_irq_source(gsi, IRQ_SOURCE_IOAPIC);
@@ -301,6 +305,7 @@ ioapic_disable_io_interrupt(int32 gsi)
struct ioapic* ioapic = find_ioapic(gsi);
if (ioapic == NULL)
return;
SpinLocker _(ioapic->registers_lock);
uint8 pin = gsi - ioapic->global_interrupt_base;
TRACE("ioapic_disable_io_interrupt: gsi %" B_PRId32
@@ -318,6 +323,7 @@ ioapic_configure_io_interrupt(int32 gsi, uint32 config)
struct ioapic* ioapic = find_ioapic(gsi);
if (ioapic == NULL)
return;
InterruptsSpinLocker _(ioapic->registers_lock);
uint8 pin = gsi - ioapic->global_interrupt_base;
TRACE("ioapic_configure_io_interrupt: gsi %" B_PRId32
@@ -332,6 +338,7 @@ ioapic_configure_io_interrupt(int32 gsi, uint32 config)
static status_t
ioapic_map_ioapic(struct ioapic& ioapic, phys_addr_t physicalAddress)
{
ioapic.registers_lock = B_SPINLOCK_INITIALIZER;
ioapic.register_area = vm_map_physical_memory(B_SYSTEM_TEAM, "io-apic",
(void**)&ioapic.registers, ioapic.registers != NULL ? B_EXACT_ADDRESS
: B_ANY_KERNEL_ADDRESS, B_PAGE_SIZE, B_KERNEL_READ_AREA