linux-kernel - Re: [PATCH v3 03/26] of/irq: Add IRQ affinity reporting interface

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Message-ID: <20251009174959.00001b05@huawei.com>
Date: Thu, 9 Oct 2025 17:49:59 +0100
From: Jonathan Cameron <jonathan.cameron@...wei.com>
To: Marc Zyngier <maz@...nel.org>
CC: <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-acpi@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, "Mark
 Rutland" <mark.rutland@....com>, Will Deacon <will@...nel.org>, "Rafael J.
 Wysocki" <rafael@...nel.org>, Rob Herring <robh@...nel.org>, "Saravana
 Kannan" <saravanak@...gle.com>, Greg Kroah-Hartman
	<gregkh@...uxfoundation.org>, Sven Peter <sven@...nel.org>, Janne Grunau
	<j@...nau.net>, Suzuki K Poulose <suzuki.poulose@....com>, James Clark
	<james.clark@...aro.org>
Subject: Re: [PATCH v3 03/26] of/irq: Add IRQ affinity reporting interface

On Mon, 22 Sep 2025 09:28:10 +0100
Marc Zyngier <maz@...nel.org> wrote:

> Plug the irq_populate_fwspec_info() helper into the OF layer
> to offer an IRQ affinity reporting function.
> 
> Signed-off-by: Marc Zyngier <maz@...nel.org>
Trivial comment inline but I don't care that much.
Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>

> ---
>  drivers/of/irq.c       | 20 ++++++++++++++++++++
>  include/linux/of_irq.h |  7 +++++++
>  2 files changed, 27 insertions(+)
> 
> diff --git a/drivers/of/irq.c b/drivers/of/irq.c
> index 74aaea61de13c..9a205cb033bda 100644
> --- a/drivers/of/irq.c
> +++ b/drivers/of/irq.c
> @@ -479,6 +479,26 @@ int of_irq_get(struct device_node *dev, int index)
>  }
>  EXPORT_SYMBOL_GPL(of_irq_get);
>  
> +const struct cpumask *of_irq_get_affinity(struct device_node *dev, int index)
> +{
> +	struct of_phandle_args oirq;
> +	struct irq_fwspec_info info;
> +	struct irq_fwspec fwspec;
> +	int rc;
> +
> +	rc = of_irq_parse_one(dev, index, &oirq);
> +	if (rc)
> +		return NULL;
> +
> +	of_phandle_args_to_fwspec(oirq.np, oirq.args, oirq.args_count,
> +				  &fwspec);
> +
> +	if (!irq_populate_fwspec_info(&fwspec, &info))
> +		return info.affinity;
My slightly picky mental consistency filter suggests that this would look
more like the ACPI version as

	if (irq_populate_fwspec_info(&fwspec, &info))
		return NULL;

	return info.affinity;

But I don't really care.

> +
> +	return NULL;
> +}
> +