linux-kernel - Re: [PATCH v2] pinctrl: samsung: add irq_set_affinity() for non wake up external gpio interrupt

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Date:   Tue, 28 Nov 2023 08:29:30 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Youngmin Nam <youngmin.nam@...sung.com>
Cc:     tomasz.figa@...il.com, s.nawrocki@...sung.com,
        alim.akhtar@...sung.com, linus.walleij@...aro.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, semen.protsenko@...aro.org
Subject: Re: [PATCH v2] pinctrl: samsung: add irq_set_affinity() for non wake
 up external gpio interrupt

On 28/11/2023 02:01, Youngmin Nam wrote:
> On Mon, Nov 27, 2023 at 10:54:56AM +0100, Krzysztof Kozlowski wrote:
>> On 26/11/2023 10:46, Youngmin Nam wrote:
>>> To support affinity setting for non wake up external gpio interrupt,
>>> add irq_set_affinity callback using irq number from pinctrl driver data.
>>>
>>> Before this patch, changing the irq affinity of gpio interrupt is not possible:
>>>
>>>     # cat /proc/irq/418/smp_affinity
>>>     3ff
>>>     # echo 00f > /proc/irq/418/smp_affinity
>>
>> Does this command succeed on your board?
>>
> Yes.

Hm, fails all the time one mine.

> 
>>>     # cat /proc/irq/418/smp_affinity
>>>     3ff
>>>     # cat /proc/interrupts
>>>                CPU0       CPU1       CPU2       CPU3    ...
>>>     418:       3631          0          0          0    ...
>>>
>>> With this patch applied, it's possible to change irq affinity of gpio interrupt:
>>
>> ...
>>
>> On which board did you test it?
>>
>>
> I tested on S5E9945 ERD(Exynos Reference Development) board.

There is no such board upstream. How can we reproduce this issue? I am
afraid we cannot test neither the bug nor the fix.

> 
>>> +	if (parent)
>>> +		return parent->chip->irq_set_affinity(parent, dest, force);
>>> +
>>
>> I think there is a  helper for it: irq_chip_set_affinity_parent().
>>
>>
> 
> The irq_chip_set_affinity_parent() requires parent_data of irq_data.

Hm, so now I wonder why do we not have parent_data...

> But when I tested as below, exynos's irqd->parent_data was null.
> So we should use irqchip's affinity function instead of the helper function.
> 



Best regards,
Krzysztof