Commit 0725cbb9 authored Jul 08, 2008 by Jeremy Fitzhardinge Committed by Ingo Molnar Jul 16, 2008

xen64: add identity irq->vector map



The x86_64 interrupt subsystem is oriented towards vectors, as opposed
to a flat irq space as it is in x86-32.  This patch adds a simple
identity irq->vector mapping so that we can continue to feed irqs into
do_IRQ() and get a good result.

Ideally x86_32 will unify with the 64-bit code and use vectors too.
At that point we can move to mapping event channels to vectors, which
will allow us to economise on irqs (so per-cpu event channels can
share irqs, rather than having to allocte one per cpu, for example).

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent 88459d4c

arch/x86/xen/enlighten.c

+18 −1

Original line number	Diff line number	Diff line
		@@ -1085,8 +1085,25 @@ static const struct pv_cpu_ops xen_cpu_ops __initdata = {
		},
		};

		static void __init __xen_init_IRQ(void)
		{
		#ifdef CONFIG_X86_64
		int i;

		/* Create identity vector->irq map */
		for(i = 0; i < NR_VECTORS; i++) {
		int cpu;

		for_each_possible_cpu(cpu)
		per_cpu(vector_irq, cpu)[i] = i;
		}
		#endif /* CONFIG_X86_64 */

		xen_init_IRQ();
		}

		static const struct pv_irq_ops xen_irq_ops __initdata = {
		.init_IRQ = xen_init_IRQ,
		.init_IRQ = __xen_init_IRQ,
		.save_fl = xen_save_fl,
		.restore_fl = xen_restore_fl,
		.irq_disable = xen_irq_disable,