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authorJoerg Roedel <joro@8bytes.org>2012-09-26 12:44:35 +0200
committerJoerg Roedel <joro@8bytes.org>2013-01-28 10:48:30 +0100
commit1c4248ca4e783e47cc34e313d9f82b4ea52774cc (patch)
treee64dba1b95ad1ed8bbf6b3bb6cd0ec893d3c7d9c /drivers/iommu
parent336224ba5e4fb42a95d02ab0aa0fdff21649bb38 (diff)
x86, io_apic: Introduce x86_io_apic_ops.disable()
This function pointer is used to call a system-specific function for disabling the IO-APIC. Currently this is used for IRQ remapping which has its own disable routine. Also introduce the necessary infrastructure in the interrupt remapping code to overwrite this and other function pointers as necessary by interrupt remapping. Signed-off-by: Joerg Roedel <joro@8bytes.org> Acked-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/iommu')
-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)