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path: root/drivers/iommu/irq_remapping.c
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Diffstat (limited to 'drivers/iommu/irq_remapping.c')
-rw-r--r--drivers/iommu/irq_remapping.c31
1 files changed, 30 insertions, 1 deletions
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 19381b90e619..db3dcaf4ddf0 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -1,3 +1,4 @@
+#include <linux/cpumask.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/cpumask.h>
@@ -6,6 +7,9 @@
#include <asm/hw_irq.h>
#include <asm/irq_remapping.h>
+#include <asm/processor.h>
+#include <asm/x86_init.h>
+#include <asm/apic.h>
#include "irq_remapping.h"
@@ -17,6 +21,24 @@ int no_x2apic_optout;
static struct irq_remap_ops *remap_ops;
+static void irq_remapping_disable_io_apic(void)
+{
+ /*
+ * With interrupt-remapping, for now we will use virtual wire A
+ * mode, as virtual wire B is little complex (need to configure
+ * both IOAPIC RTE as well as interrupt-remapping table entry).
+ * As this gets called during crash dump, keep this simple for
+ * now.
+ */
+ if (cpu_has_apic || apic_from_smp_config())
+ disconnect_bsp_APIC(0);
+}
+
+static void __init irq_remapping_modify_x86_ops(void)
+{
+ x86_io_apic_ops.disable = irq_remapping_disable_io_apic;
+}
+
static __init int setup_nointremap(char *str)
{
disable_irq_remap = 1;
@@ -79,10 +101,17 @@ int __init irq_remapping_prepare(void)
int __init irq_remapping_enable(void)
{
+ int ret;
+
if (!remap_ops || !remap_ops->enable)
return -ENODEV;
- return remap_ops->enable();
+ ret = remap_ops->enable();
+
+ if (irq_remapping_enabled)
+ irq_remapping_modify_x86_ops();
+
+ return ret;
}
void irq_remapping_disable(void)