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-rw-r--r--arch/x86/include/asm/io_apic.h1
-rw-r--r--arch/x86/kernel/acpi/boot.c22
-rw-r--r--arch/x86/kernel/apic/io_apic.c11
3 files changed, 34 insertions, 0 deletions
diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index ce63cf34c93c..0db2b7037e4b 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -191,6 +191,7 @@ extern void mp_unmap_irq(int irq);
extern int mp_register_ioapic(int id, u32 address, u32 gsi_base,
struct ioapic_domain_cfg *cfg);
extern int mp_unregister_ioapic(u32 gsi_base);
+extern int mp_ioapic_registered(u32 gsi_base);
extern int mp_irqdomain_map(struct irq_domain *domain, unsigned int virq,
irq_hw_number_t hwirq);
extern void mp_irqdomain_unmap(struct irq_domain *domain, unsigned int virq);
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 5427d9b70f75..ddddaed91872 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -826,6 +826,28 @@ int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
}
EXPORT_SYMBOL(acpi_unregister_ioapic);
+/**
+ * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
+ * has been registered
+ * @handle: ACPI handle of the IOAPIC deivce
+ * @gsi_base: GSI base associated with the IOAPIC
+ *
+ * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
+ * with acpi_register_ioapic()/acpi_unregister_ioapic().
+ */
+int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
+{
+ int ret = 0;
+
+#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
+ mutex_lock(&acpi_ioapic_lock);
+ ret = mp_ioapic_registered(gsi_base);
+ mutex_unlock(&acpi_ioapic_lock);
+#endif
+
+ return ret;
+}
+
static int __init acpi_parse_sbf(struct acpi_table_header *table)
{
struct acpi_table_boot *sb;
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 06a0a6ce6750..1cedf410096e 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -4026,6 +4026,17 @@ int mp_unregister_ioapic(u32 gsi_base)
return 0;
}
+int mp_ioapic_registered(u32 gsi_base)
+{
+ int ioapic;
+
+ for_each_ioapic(ioapic)
+ if (ioapics[ioapic].gsi_config.gsi_base == gsi_base)
+ return 1;
+
+ return 0;
+}
+
int mp_irqdomain_map(struct irq_domain *domain, unsigned int virq,
irq_hw_number_t hwirq)
{