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Commit b2eba39b authored by Marc Zyngier's avatar Marc Zyngier
Browse files

genirq/msi: Make the .prepare callback reusable 



The .prepare callbacks are so far only called from msi_domain_alloc_irqs.
In order to reuse that code, split that code and create a
msi_domain_prepare_irqs function that the existing code can call into.

Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent c466595c

include/linux/msi.h

+4 −0
Original line number Diff line number Diff line
@@ -279,6 +279,10 @@ struct irq_domain *platform_msi_create_irq_domain(struct fwnode_handle *fwnode, 
int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,

				   irq_write_msi_msg_t write_msi_msg);

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);

#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */



#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN

kernel/irq/msi.c

+15 −3
Original line number Diff line number Diff line
@@ -252,6 +252,20 @@ struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode, 
					   &msi_domain_ops, info);

}



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

			    int nvec, msi_alloc_info_t *arg)

{

	struct msi_domain_info *info = domain->host_data;

	struct msi_domain_ops *ops = info->ops;

	int ret;



	ret = ops->msi_check(domain, info, dev);

	if (ret == 0)

		ret = ops->msi_prepare(domain, dev, nvec, arg);



	return ret;

}



/**

 * msi_domain_alloc_irqs - Allocate interrupts from a MSI interrupt domain

 * @domain:	The domain to allocate from
@@ -270,9 +284,7 @@ int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev, 
	struct msi_desc *desc;

	int i, ret, virq = -1;



	ret = ops->msi_check(domain, info, dev);

	if (ret == 0)

		ret = ops->msi_prepare(domain, dev, nvec, &arg);

	ret = msi_domain_prepare_irqs(domain, dev, nvec, &arg);

	if (ret)

		return ret;