x86/irq: Convert IOAPIC to use hierarchical irqdomain interfaces

Convert IOAPIC driver to support and use hierarchical irqdomain
interfaces.  It's a little big, but would break bisecting if we split
it into multiple patches.

Fold in a patch from Andy Shevchenko <[email protected]>
to make it bisectable.
http://lkml.org/lkml/2014/12/10/622

Signed-off-by: Jiang Liu <[email protected]>
Tested-by: Joerg Roedel <[email protected]>
Cc: Konrad Rzeszutek Wilk <[email protected]>
Cc: Sander Eikelenboom <[email protected]>
Cc: David Vrabel <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Joerg Roedel <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: [email protected]
Cc: Bjorn Helgaas <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Rafael J. Wysocki <[email protected]>
Cc: Randy Dunlap <[email protected]>
Cc: Yinghai Lu <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Dimitri Sivanich <[email protected]>
Cc: Len Brown <[email protected]>
Cc: Pavel Machek <[email protected]>
Cc: Grant Likely <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: David Cohen <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

Author: Jiang Liu

arch/x86/kernel/acpi/boot.c

@@ -412,11 +412,6 @@ static int mp_register_gsi(struct device *dev, u32 gsi, int trigger,
 	trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
 	polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
 	node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
-	if (mp_set_gsi_attr(gsi, trigger, polarity, node)) {
-		pr_warn("Failed to set pin attr for GSI%d\n", gsi);
-		return -1;
-	}
-
 	ioapic_set_alloc_attr(&info, node, trigger, polarity);
 	irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
 	if (irq < 0)
@@ -442,8 +437,10 @@ static void mp_unregister_gsi(u32 gsi)
 }
 
 static struct irq_domain_ops acpi_irqdomain_ops = {
-	.map = mp_irqdomain_map,
-	.unmap = mp_irqdomain_unmap,
+	.alloc = mp_irqdomain_alloc,
+	.free = mp_irqdomain_free,
+	.activate = mp_irqdomain_activate,
+	.deactivate = mp_irqdomain_deactivate,
 };
 
 static int __init