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Commit 2145ac93 authored by Marc Zyngier's avatar Marc Zyngier
Browse files

genirq/msi: Add msi_domain_populate_irqs 



To be able to allocate interrupts from the MSI layer down,
add a new msi_domain_populate_irqs entry point.

Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent b2eba39b

include/linux/msi.h

+2 −0
Original line number Diff line number Diff line
@@ -283,6 +283,8 @@ void platform_msi_domain_free_irqs(struct device *dev); 
/* When an MSI domain is used as an intermediate domain */

int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev,

			    int nvec, msi_alloc_info_t *args);

int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,

			     int virq, int nvec, msi_alloc_info_t *args);

#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */



#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN

kernel/irq/msi.c

+40 −0
Original line number Diff line number Diff line
@@ -266,6 +266,46 @@ int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev, 
	return ret;

}



int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,

			     int virq, int nvec, msi_alloc_info_t *arg)

{

	struct msi_domain_info *info = domain->host_data;

	struct msi_domain_ops *ops = info->ops;

	struct msi_desc *desc;

	int ret = 0;



	for_each_msi_entry(desc, dev) {

		/* Don't even try the multi-MSI brain damage. */

		if (WARN_ON(!desc->irq || desc->nvec_used != 1)) {

			ret = -EINVAL;

			break;

		}



		if (!(desc->irq >= virq && desc->irq < (virq + nvec)))

			continue;



		ops->set_desc(arg, desc);

		/* Assumes the domain mutex is held! */

		ret = irq_domain_alloc_irqs_recursive(domain, virq, 1, arg);

		if (ret)

			break;



		irq_set_msi_desc_off(virq, 0, desc);

	}



	if (ret) {

		/* Mop up the damage */

		for_each_msi_entry(desc, dev) {

			if (!(desc->irq >= virq && desc->irq < (virq + nvec)))

				continue;



			irq_domain_free_irqs_common(domain, desc->irq, 1);

		}

	}



	return ret;

}



/**

 * msi_domain_alloc_irqs - Allocate interrupts from a MSI interrupt domain

 * @domain:	The domain to allocate from