Commit 14be098c authored by Cédric Le Goater's avatar Cédric Le Goater Committed by Michael Ellerman
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powerpc/xive: Add support for IRQ domain hierarchy 



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: default avatarCédric Le Goater <clg@kaod.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210701132750.1475580-4-clg@kaod.org
parent e8120200

arch/powerpc/sysdev/xive/common.c

+64 −0
Original line number Diff line number Diff line
@@ -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,