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irqchip/msi-lib: Add IRQ_DOMAIN_FLAG_FWNODE_PARENT handling

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In some irqchip implementations the fwnode representing the IRQdomain
and the MSI controller fwnode do not match; in particular the IRQdomain
fwnode is the MSI controller fwnode parent.

To support selecting such IRQ domains, add a flag in core IRQ domain
code that explicitly tells the MSI lib to use the parent fwnode while
carrying out IRQ domain selection.

Update the msi-lib select callback with the resulting logic.

Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20250703-gicv5-host-v7-27-12e71f1b3528@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Lorenzo Pieralisi 2025-07-03 12:25:17 +02:00 committed by Marc Zyngier
parent b4ead12d95
commit 8b65db1e93
2 changed files with 7 additions and 1 deletions
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5
drivers/irqchip/irq-msi-lib.c
View File

@ -133,11 +133,14 @@ int msi_lib_irq_domain_select(struct irq_domain *d, struct irq_fwspec *fwspec,
{
const struct msi_parent_ops *ops = d->msi_parent_ops;
u32 busmask = BIT(bus_token);
struct fwnode_handle *fwh;
if (!ops)
return 0;
if (fwspec->fwnode != d->fwnode || fwspec->param_count != 0)
fwh = d->flags & IRQ_DOMAIN_FLAG_FWNODE_PARENT ? fwnode_get_parent(fwspec->fwnode)
: fwspec->fwnode;
if (fwh != d->fwnode || fwspec->param_count != 0)
return 0;
/* Handle pure domain searches */

3
include/linux/irqdomain.h
View File

@ -212,6 +212,9 @@ enum {
/* Address and data pair is mutable when irq_set_affinity() */
IRQ_DOMAIN_FLAG_MSI_IMMUTABLE = (1 << 11),
/* IRQ domain requires parent fwnode matching */
IRQ_DOMAIN_FLAG_FWNODE_PARENT = (1 << 12),
/*
* Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved
* for implementation specific purposes and ignored by the