[PATCH v4 02/26] ACPI: irq: Add IRQ affinity reporting interface
From: Marc Zyngier <maz@kernel.org>
Date: 2025-10-20 12:30:10
Also in:
linux-acpi, lkml
Subsystem:
acpi, the rest · Maintainers:
"Rafael J. Wysocki", Linus Torvalds
Plug the irq_populate_fwspec_info() helper into the ACPI layer to offer an IRQ 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. Acked-by: Rafael J. Wysocki (Intel) <rafael@kernel.org> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com> Tested-by: Will Deacon <will@kernel.org> Signed-off-by: Marc Zyngier <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