[Patch Part1 V2 21/29] x86, mpparse, irq: provide basic irqdomain support

[Jiang Liu <jiang.liu@linux.intel.com>]

Enhance mpparse to provide basic support of irqdomain with identity
mapping between GSIs and IRQs.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
---
 arch/x86/kernel/mpparse.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/mpparse.c b/arch/x86/kernel/mpparse.c
index 6cb9a43ecde1..b9823bea332a 100644
--- a/arch/x86/kernel/mpparse.c
+++ b/arch/x86/kernel/mpparse.c
@@ -19,6 +19,7 @@
 #include <linux/module.h>
 #include <linux/smp.h>
 #include <linux/pci.h>
+#include <linux/irqdomain.h>
 
 #include <asm/mtrr.h>
 #include <asm/mpspec.h>
@@ -112,10 +113,18 @@ static void __init MP_bus_info(struct mpc_bus *m)
 		pr_warn("Unknown bustype %s - ignoring\n", str);
 }
 
+static struct irq_domain_ops mp_ioapic_irqdomain_ops;
+
+static struct irq_domain *mp_ioapic_create_irqdomain(int ioapic, void *arg)
+{
+	return mp_irqdomain_create(ioapic, NULL, &mp_ioapic_irqdomain_ops);
+}
+
 static void __init MP_ioapic_info(struct mpc_ioapic *m)
 {
 	if (m->flags & MPC_APIC_USABLE)
-		mp_register_ioapic(m->apicid, m->apicaddr, gsi_top, NULL, NULL);
+		mp_register_ioapic(m->apicid, m->apicaddr, gsi_top,
+				   mp_ioapic_create_irqdomain, NULL);
 }
 
 static void __init print_mp_irq_info(struct mpc_intsrc *mp_irq)
-- 
1.7.10.4