Commit 5324fe21 authored by Marc Zyngier's avatar Marc Zyngier Committed by Thomas Gleixner
Browse files

ACPI: irq: Add interrupt affinity reporting interface 



Plug the irq_populate_fwspec_info() helper into the ACPI layer to offer an
interrupt affinity reporting function. This is currently only supported for
the CONFIG_ACPI_GENERIC_GSI configurations, but could later be extended to
legacy architectures if necessary.

Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Tested-by: default avatarWill Deacon <will@kernel.org>
Reviewed-by: default avatarJonathan Cameron <jonathan.cameron@huawei.com>
Acked-by: default avatarRafael J. Wysocki (Intel) <rafael@kernel.org>
Link: https://patch.msgid.link/20251020122944.3074811-3-maz@kernel.org
parent 87b0031f

drivers/acpi/irq.c

+19 −0
Original line number Diff line number Diff line
@@ -300,6 +300,25 @@ int acpi_irq_get(acpi_handle handle, unsigned int index, struct resource *res) 
}

EXPORT_SYMBOL_GPL(acpi_irq_get);



const struct cpumask *acpi_irq_get_affinity(acpi_handle handle,

					    unsigned int index)

{

	struct irq_fwspec_info info;

	struct irq_fwspec fwspec;

	unsigned long flags;



	if (acpi_irq_parse_one(handle, index, &fwspec, &flags))

		return NULL;



	if (irq_populate_fwspec_info(&fwspec, &info))

		return NULL;



	if (!(info.flags & IRQ_FWSPEC_INFO_AFFINITY_VALID))

		return NULL;



	return info.affinity;

}



/**

 * acpi_set_irq_model - Setup the GSI irqdomain information

 * @model: the value assigned to acpi_irq_model

include/linux/acpi.h

+7 −0
Original line number Diff line number Diff line
@@ -1509,12 +1509,19 @@ static inline int acpi_parse_spcr(bool enable_earlycon, bool enable_console) 


#if IS_ENABLED(CONFIG_ACPI_GENERIC_GSI)

int acpi_irq_get(acpi_handle handle, unsigned int index, struct resource *res);

const struct cpumask *acpi_irq_get_affinity(acpi_handle handle,

					    unsigned int index);

#else

static inline

int acpi_irq_get(acpi_handle handle, unsigned int index, struct resource *res)

{

	return -EINVAL;

}

static inline const struct cpumask *acpi_irq_get_affinity(acpi_handle handle,

							  unsigned int index)

{

	return NULL;

}

#endif



#ifdef CONFIG_ACPI_LPIT