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From: Laurent Vivier <lvivier@redhat.com>
To: Marc Zyngier <maz@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
	Paul Mackerras <paulus@samba.org>,
	linux-pci@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	"Michael S . Tsirkin" <mst@redhat.com>,
	Greg Kurz <groug@kaod.org>, Christoph Hellwig <hch@lst.de>,
	Michael Ellerman <mpe@ellerman.id.au>
Subject: Re: [PATCH v2 1/2] genirq: add an irq_create_mapping_affinity() function
Date: Wed, 25 Nov 2020 16:00:03 +0100	[thread overview]
Message-ID: <84cdd8d0-8b8f-cc8e-9672-2661f6377114@redhat.com> (raw)
In-Reply-To: <5100171ff6d4c3efffe008e1e0bf3707@kernel.org>

On 25/11/2020 15:54, Marc Zyngier wrote:
> On 2020-11-25 14:09, Laurent Vivier wrote:
>> On 25/11/2020 14:20, Thomas Gleixner wrote:
>>> Laurent,
>>>
>>> On Wed, Nov 25 2020 at 12:16, Laurent Vivier wrote:
>>>
>>> The proper subsystem prefix is: 'genirq/irqdomain:' and the first letter
>>> after the colon wants to be uppercase.
>>
>> Ok.
>>
>>>> This function adds an affinity parameter to irq_create_mapping().
>>>> This parameter is needed to pass it to irq_domain_alloc_descs().
>>>
>>> A changelog has to explain the WHY. 'The parameter is needed' is not
>>> really useful information.
>>>
>>
>> The reason of this change is explained in PATCH 2.
>>
>> I have two patches, one to change the interface with no functional
>> change (PATCH 1) and
>> one to fix the problem (PATCH 2). Moreover they don't cover the same subsystems.
>>
>> I can either:
>> - merge the two patches
>> - or make a reference in the changelog of PATCH 1 to PATCH 2
>>   (something like "(see folowing patch "powerpc/pseries: pass MSI affinity to
>>    irq_create_mapping()")")
>> - or copy some information from PATCH 2
>>   (something like "this parameter is needed by rtas_setup_msi_irqs()
>> to pass the affinity
>>    to irq_domain_alloc_descs() to fix multiqueue affinity")
>>
>> What do you prefer?
> 
> How about something like this for the first patch:
> 
> "There is currently no way to convey the affinity of an interrupt
>  via irq_create_mapping(), which creates issues for devices that
>  expect that affinity to be managed by the kernel.
> 
>  In order to sort this out, rename irq_create_mapping() to
>  irq_create_mapping_affinity() with an additional affinity parameter
>  that can conveniently passed down to irq_domain_alloc_descs().
> 
>  irq_create_mapping() is then re-implemented as a wrapper around
>  irq_create_mapping_affinity()."

It looks perfect. I update the changelog with that.

Thanks,
Laurent


  reply	other threads:[~2020-11-25 15:00 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-25 11:16 [PATCH v2 0/2] powerpc/pseries: fix MSI/X IRQ affinity on pseries Laurent Vivier
2020-11-25 11:16 ` [PATCH v2 1/2] genirq: add an irq_create_mapping_affinity() function Laurent Vivier
2020-11-25 12:45   ` Greg Kurz
2020-11-25 13:20   ` Thomas Gleixner
2020-11-25 14:09     ` Laurent Vivier
2020-11-25 14:54       ` Marc Zyngier
2020-11-25 15:00         ` Laurent Vivier [this message]
2020-11-25 11:16 ` [PATCH v2 2/2] powerpc/pseries: pass MSI affinity to irq_create_mapping() Laurent Vivier
2020-11-25 12:51   ` Greg Kurz

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