Commit e4f0aa3b authored by Cédric Le Goater's avatar Cédric Le Goater Committed by Michael Ellerman
Browse files

powerpc/xics: Add support for IRQ domain hierarchy 



XICS doesn't have any state associated with the IRQ. The support is
straightforward and simpler than for XIVE.

Signed-off-by: default avatarCédric Le Goater <clg@kaod.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210701132750.1475580-21-clg@kaod.org
parent 53b34e8d

arch/powerpc/sysdev/xics/xics-common.c

+41 −0
Original line number Diff line number Diff line
@@ -406,7 +406,48 @@ int xics_retrigger(struct irq_data *data) 
	return 0;

}



#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY

static int xics_host_domain_translate(struct irq_domain *d, struct irq_fwspec *fwspec,

				      unsigned long *hwirq, unsigned int *type)

{

	return xics_host_xlate(d, to_of_node(fwspec->fwnode), fwspec->param,

			       fwspec->param_count, hwirq, type);

}



static int xics_host_domain_alloc(struct irq_domain *domain, unsigned int virq,

				  unsigned int nr_irqs, void *arg)

{

	struct irq_fwspec *fwspec = arg;

	irq_hw_number_t hwirq;

	unsigned int type = IRQ_TYPE_NONE;

	int i, rc;



	rc = xics_host_domain_translate(domain, fwspec, &hwirq, &type);

	if (rc)

		return rc;



	pr_debug("%s %d/%lx #%d\n", __func__, virq, hwirq, nr_irqs);



	for (i = 0; i < nr_irqs; i++)

		irq_domain_set_info(domain, virq + i, hwirq + i, xics_ics->chip,

				    xics_ics, handle_fasteoi_irq, NULL, NULL);



	return 0;

}



static void xics_host_domain_free(struct irq_domain *domain,

				  unsigned int virq, unsigned int nr_irqs)

{

	pr_debug("%s %d #%d\n", __func__, virq, nr_irqs);

}

#endif



static const struct irq_domain_ops xics_host_ops = {

#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY

	.alloc	= xics_host_domain_alloc,

	.free	= xics_host_domain_free,

	.translate = xics_host_domain_translate,

#endif

	.match = xics_host_match,

	.map = xics_host_map,

	.xlate = xics_host_xlate,