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xen: remap GSIs as pirqs when running as initial domain

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Implement xen_register_gsi to setup the correct triggering and polarity
properties of a gsi.
Implement xen_register_pirq to register a particular gsi as pirq and
receive interrupts as events.
Call xen_setup_pirqs to register all the legacy ISA irqs as pirqs.

Signed-off-by: Jeremy Fitzhardinge <[email protected]>
Signed-off-by: Stefano Stabellini <[email protected]>
Reviewed-by: Konrad Rzeszutek Wilk <[email protected]>
This commit is contained in:
Jeremy Fitzhardinge 2010-09-02 14:51:39 +01:00 • committed by Stefano Stabellini
commit 38aa66fcb7
4 changed files with 165 additions and 0 deletions
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13
drivers/xen/events.c
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@ -681,6 +681,8 @@ out:
int xen_destroy_irq(int irq)
{
struct irq_desc *desc;
struct physdev_unmap_pirq unmap_irq;
struct irq_info *info = info_for_irq(irq);
int rc = -ENOENT;
spin_lock(&irq_mapping_update_lock);
@ -689,6 +691,15 @@ int xen_destroy_irq(int irq)
if (!desc)
goto out;
if (xen_initial_domain()) {
unmap_irq.pirq = info->u.pirq.gsi;
unmap_irq.domid = DOMID_SELF;
rc = HYPERVISOR_physdev_op(PHYSDEVOP_unmap_pirq, &unmap_irq);
if (rc) {
printk(KERN_WARNING "unmap irq failed %d\n", rc);
goto out;
}
}
irq_info[irq] = mk_unbound_info();
irq_free_desc(irq);
@ -1425,5 +1436,7 @@ void __init xen_init_IRQ(void)
pci_xen_hvm_init();
} else {
irq_ctx_init(smp_processor_id());
if (xen_initial_domain())
xen_setup_pirqs();
}
}