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powerpc/xics: Add support for IRQ domain hierarchy

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

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210701132750.1475580-21-clg@kaod.org
This commit is contained in:
Cédric Le Goater 2021-07-01 15:27:38 +02:00 committed by Michael Ellerman
parent 53b34e8db7
commit e4f0aa3b47
1 changed files with 41 additions and 0 deletions
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41
arch/powerpc/sysdev/xics/xics-common.c
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@ -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,