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xen64: add identity irq->vector map

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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>
This commit is contained in:
Jeremy Fitzhardinge 2008-07-08 15:07:03 -07:00 committed by Ingo Molnar
parent 88459d4c7e
commit 0725cbb977
1 changed files with 18 additions and 1 deletions
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19
arch/x86/xen/enlighten.c
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@ -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,