Commit 0d5daa93 authored by Marc Zyngier's avatar Marc Zyngier Committed by Thomas Gleixner
Browse files

platform: Add firmware-agnostic irq and affinity retrieval interface 



Expand platform_get_irq_optional() to also return an affinity if available,
renaming it to platform_get_irq_affinity() in the process.

platform_get_irq_optional() is preserved with its current semantics by
calling into the new helper with a NULL affinity pointer.

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>
Link: https://patch.msgid.link/20251020122944.3074811-5-maz@kernel.org
parent 5404f5c0

drivers/base/platform.c

+56 −15
Original line number Diff line number Diff line
@@ -150,25 +150,37 @@ devm_platform_ioremap_resource_byname(struct platform_device *pdev, 
EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource_byname);

#endif /* CONFIG_HAS_IOMEM */



static const struct cpumask *get_irq_affinity(struct platform_device *dev,

					      unsigned int num)

{

	const struct cpumask *mask = NULL;

#ifndef CONFIG_SPARC

	struct fwnode_handle *fwnode = dev_fwnode(&dev->dev);



	if (is_of_node(fwnode))

		mask = of_irq_get_affinity(to_of_node(fwnode), num);

	else if (is_acpi_device_node(fwnode))

		mask = acpi_irq_get_affinity(ACPI_HANDLE_FWNODE(fwnode), num);

#endif



	return mask ?: cpu_possible_mask;

}



/**

 * platform_get_irq_optional - get an optional IRQ for a device

 * platform_get_irq_affinity - get an optional IRQ and its affinity for a device

 * @dev:	platform device

 * @num: IRQ number index

 * @num:	interrupt number index

 * @affinity:	optional cpumask pointer to get the affinity of a per-cpu interrupt

 *

 * Gets an IRQ for a platform device. Device drivers should check the return

 * value for errors so as to not pass a negative integer value to the

 * request_irq() APIs. This is the same as platform_get_irq(), except that it

 * does not print an error message if an IRQ can not be obtained.

 *

 * For example::

 * Gets an interupt for a platform device. Device drivers should check the

 * return value for errors so as to not pass a negative integer value to

 * the request_irq() APIs. Optional affinity information is provided in the

 * affinity pointer if available, and NULL otherwise.

 *

 *		int irq = platform_get_irq_optional(pdev, 0);

 *		if (irq < 0)

 *			return irq;

 *

 * Return: non-zero IRQ number on success, negative error number on failure.

 * Return: non-zero interrupt number on success, negative error number on failure.

 */

int platform_get_irq_optional(struct platform_device *dev, unsigned int num)

int platform_get_irq_affinity(struct platform_device *dev, unsigned int num,

			      const struct cpumask **affinity)

{

	int ret;

#ifdef CONFIG_SPARC
@@ -236,8 +248,37 @@ int platform_get_irq_optional(struct platform_device *dev, unsigned int num) 
out:

	if (WARN(!ret, "0 is an invalid IRQ number\n"))

		return -EINVAL;



	if (ret > 0 && affinity)

		*affinity = get_irq_affinity(dev, num);



	return ret;

}

EXPORT_SYMBOL_GPL(platform_get_irq_affinity);



/**

 * platform_get_irq_optional - get an optional interrupt for a device

 * @dev:	platform device

 * @num:	interrupt number index

 *

 * Gets an interrupt for a platform device. Device drivers should check the

 * return value for errors so as to not pass a negative integer value to

 * the request_irq() APIs. This is the same as platform_get_irq(), except

 * that it does not print an error message if an interrupt can not be

 * obtained.

 *

 * For example::

 *

 *		int irq = platform_get_irq_optional(pdev, 0);

 *		if (irq < 0)

 *			return irq;

 *

 * Return: non-zero interrupt number on success, negative error number on failure.

 */

int platform_get_irq_optional(struct platform_device *dev, unsigned int num)

{

	return platform_get_irq_affinity(dev, num, NULL);

}

EXPORT_SYMBOL_GPL(platform_get_irq_optional);



/**

include/linux/platform_device.h

+2 −0
Original line number Diff line number Diff line
@@ -102,6 +102,8 @@ devm_platform_ioremap_resource_byname(struct platform_device *pdev, 


extern int platform_get_irq(struct platform_device *, unsigned int);

extern int platform_get_irq_optional(struct platform_device *, unsigned int);

extern int platform_get_irq_affinity(struct platform_device *, unsigned int,

				     const struct cpumask **);

extern int platform_irq_count(struct platform_device *);

extern int devm_platform_get_irqs_affinity(struct platform_device *dev,

					   struct irq_affinity *affd,