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powerpc/xive: Add support for IRQ domain hierarchy

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This adds handlers to allocate/free IRQs in a domain hierarchy. We
could try to use xive_irq_domain_map() in xive_irq_domain_alloc() but
we rely on xive_irq_alloc_data() to set the IRQ handler data and
duplicating the code is simpler.

xive_irq_free_data() needs to be called when IRQ are freed to clear
the MMIO mappings and free the XIVE handler data, xive_irq_data
structure. This is going to be a problem with MSI domains which we
will address later.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210701132750.1475580-4-clg@kaod.org
This commit is contained in:
Cédric Le Goater 2021-07-01 15:27:21 +02:00 committed by Michael Ellerman
parent e812020073
commit 14be098c53
1 changed files with 64 additions and 0 deletions
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64
arch/powerpc/sysdev/xive/common.c
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@ -1366,7 +1366,71 @@ static void xive_irq_domain_debug_show(struct seq_file *m, struct irq_domain *d,
}
#endif
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
static int xive_irq_domain_translate(struct irq_domain *d,
struct irq_fwspec *fwspec,
unsigned long *hwirq,
unsigned int *type)
{
return xive_irq_domain_xlate(d, to_of_node(fwspec->fwnode),
fwspec->param, fwspec->param_count,
hwirq, type);
}
static int xive_irq_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 = xive_irq_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++) {
/* TODO: call xive_irq_domain_map() */
/*
* Mark interrupts as edge sensitive by default so that resend
* actually works. Will fix that up below if needed.
*/
irq_clear_status_flags(virq, IRQ_LEVEL);
/* allocates and sets handler data */
rc = xive_irq_alloc_data(virq + i, hwirq + i);
if (rc)
return rc;
irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
&xive_irq_chip, domain->host_data);
irq_set_handler(virq + i, handle_fasteoi_irq);
}
return 0;
}
static void xive_irq_domain_free(struct irq_domain *domain,
unsigned int virq, unsigned int nr_irqs)
{
int i;
pr_debug("%s %d #%d\n", __func__, virq, nr_irqs);
for (i = 0; i < nr_irqs; i++)
xive_irq_free_data(virq + i);
}
#endif
static const struct irq_domain_ops xive_irq_domain_ops = {
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
.alloc = xive_irq_domain_alloc,
.free = xive_irq_domain_free,
.translate = xive_irq_domain_translate,
#endif
.match = xive_irq_domain_match,
.map = xive_irq_domain_map,
.unmap = xive_irq_domain_unmap,