Commit 8b65db1e authored by Lorenzo Pieralisi's avatar Lorenzo Pieralisi Committed by Marc Zyngier
Browse files

irqchip/msi-lib: Add IRQ_DOMAIN_FLAG_FWNODE_PARENT handling 



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: default avatarLorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: default avatarMarc 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: default avatarMarc Zyngier <maz@kernel.org>
parent b4ead12d

drivers/irqchip/irq-msi-lib.c

+4 −1
Original line number Diff line number Diff line
@@ -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 */

include/linux/irqdomain.h

+3 −0
Original line number Diff line number Diff line
@@ -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