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genirq/msi: Add helper for creating MSI-parent irq domains 

Creating an irq domain that serves as an MSI parent requires
a substantial amount of esoteric boiler-plate code, some of
which is often provided twice (such as the bus token).

To make things a bit simpler for the unsuspecting MSI tinkerer,
provide a helper that does it for them, and serves as documentation
of what needs to be provided.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250513172819.2216709-3-maz@kernel.org
This commit is contained in:
Marc Zyngier 2025-05-13 18:28:12 +01:00 committed by Thomas Gleixner
parent e51b27438a
commit e4d001b54f
2 changed files with 30 additions and 0 deletions
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4
include/linux/msi.h
View File

@ -636,6 +636,10 @@ struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode,
struct msi_domain_info *info,
struct irq_domain *parent);
struct irq_domain_info;
struct irq_domain *msi_create_parent_irq_domain(struct irq_domain_info *info,
const struct msi_parent_ops *msi_parent_ops);
bool msi_create_device_irq_domain(struct device *dev, unsigned int domid,
const struct msi_domain_template *template,
unsigned int hwsize, void *domain_data,

26
kernel/irq/msi.c
View File

@ -911,6 +911,32 @@ struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode,
return __msi_create_irq_domain(fwnode, info, 0, parent);
}
/**
* msi_create_parent_irq_domain - Create an MSI-parent interrupt domain
* @info: MSI irqdomain creation info
* @msi_parent_ops: MSI parent callbacks and configuration
*
* Return: pointer to the created &struct irq_domain or %NULL on failure
*/
struct irq_domain *msi_create_parent_irq_domain(struct irq_domain_info *info,
const struct msi_parent_ops *msi_parent_ops)
{
struct irq_domain *d;
info->hwirq_max = max(info->hwirq_max, info->size);
info->size = info->hwirq_max;
info->domain_flags |= IRQ_DOMAIN_FLAG_MSI_PARENT;
info->bus_token = msi_parent_ops->bus_select_token;
d = irq_domain_instantiate(info);
if (IS_ERR(d))
return NULL;
d->msi_parent_ops = msi_parent_ops;
return d;
}
EXPORT_SYMBOL_GPL(msi_create_parent_irq_domain);
/**
* msi_parent_init_dev_msi_info - Delegate initialization of device MSI info down
* in the domain hierarchy