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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: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2015-11-23 08:26:06 +00:00
parent b2eba39bca
commit 2145ac9310
2 changed files with 42 additions and 0 deletions
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2
include/linux/msi.h
View File

@ -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

40
kernel/irq/msi.c
View File

@ -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