diff options
| author | Marc Zyngier <maz@kernel.org> | 2025-05-13 18:28:12 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2025-05-16 21:32:20 +0200 |
| commit | e4d001b54f78769ba1a1404c2801ae95e19fd893 (patch) | |
| tree | 0b1ec43cc196f444b9b65fcb41562124296b2791 | |
| parent | e51b27438a10391fdc94dd2046d9ffa9c2679c74 (diff) | |
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
| -rw-r--r-- | include/linux/msi.h | 4 | ||||
| -rw-r--r-- | kernel/irq/msi.c | 26 |
2 files changed, 30 insertions, 0 deletions
diff --git a/include/linux/msi.h b/include/linux/msi.h index f4b94ccaf0c1..6863540f4b71 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -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, diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index b5559fa609eb..4830b7575e0a 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -912,6 +912,32 @@ struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode, } /** + * 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 * @dev: The device for which the domain should be created |