linux-kernel - RE: [patch V2 07/33] genirq/msi: Provide msi_create/free_device_irq

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Date:   Wed, 23 Nov 2022 22:01:56 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     "Tian, Kevin" <kevin.tian@...el.com>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     "x86@...nel.org" <x86@...nel.org>, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Marc Zyngier <maz@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jason Gunthorpe <jgg@...lanox.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        "Raj, Ashok" <ashok.raj@...el.com>, Jon Mason <jdmason@...zu.us>,
        Allen Hubbe <allenbh@...il.com>
Subject: RE: [patch V2 07/33] genirq/msi: Provide
 msi_create/free_device_irq_domain()

On Wed, Nov 23 2022 at 12:38, Thomas Gleixner wrote:
> On Wed, Nov 23 2022 at 08:02, Kevin Tian wrote:
>>> +	bundle->info.hwsize = hwsize ? hwsize : MSI_MAX_INDEX;
>>
>> patch04 marks that hwsize being 0 means unknown or unlimited in the
>> header file.
>>
>> but here info.hwsize always gets a value i.e. the meaning of 0 only exists
>> in this function. What about removing the trailing words about 0 in
>> patch04?
>>
>> - + * @hwsize:		The hardware table size (0 if unknown/unlimited)
>> + + * @hwsize:		The hardware table size
>
> Fair enough, though I rather make that:
>
>  * @hwsize:		The hardware table size or the software defined
>                         index limit
>

Actually 0 still needs to be valid to guarantee backward compatibility
for all existing msi_domain_info implementations.

The above is the per device domain creation function, but yes, I can lift
that initialization into the common MSI domain creation code.

Let me stare at this some more.