From 5324fe21ba9b77b299c02191645a97777cdd73ac Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Mon, 20 Oct 2025 13:29:19 +0100 Subject: [PATCH] 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: Marc Zyngier Signed-off-by: Thomas Gleixner Tested-by: Will Deacon Reviewed-by: Jonathan Cameron Acked-by: Rafael J. Wysocki (Intel) Link: https://patch.msgid.link/20251020122944.3074811-3-maz@kernel.org --- drivers/acpi/irq.c | 19 +++++++++++++++++++ include/linux/acpi.h | 7 +++++++ 2 files changed, 26 insertions(+) diff --git a/drivers/acpi/irq.c b/drivers/acpi/irq.c index 76a856c32c4d0..d1595156c86a4 100644 --- a/drivers/acpi/irq.c +++ b/drivers/acpi/irq.c @@ -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 diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 5ff5d99f6ead5..607db773b6721 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -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 -- 2.47.3