linux-kernel - Re: [patch 21/32] NTB/msi: Convert to msi_on_each

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Message-ID: <20211201151121.GL4670@nvidia.com>
Date:   Wed, 1 Dec 2021 11:11:21 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Logan Gunthorpe <logang@...tatee.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Marc Zygnier <maz@...nel.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Megha Dey <megha.dey@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, linux-pci@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jon Mason <jdmason@...zu.us>,
        Dave Jiang <dave.jiang@...el.com>,
        Allen Hubbe <allenbh@...il.com>, linux-ntb@...glegroups.com,
        linux-s390@...r.kernel.org, Heiko Carstens <hca@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>, x86@...nel.org
Subject: Re: [patch 21/32] NTB/msi: Convert to msi_on_each_desc()

On Wed, Dec 01, 2021 at 03:52:02PM +0100, Thomas Gleixner wrote:
> So we really can go and create a MSI irqdomain and stick the pointer
> into stdev->dev.irqdomain. The parent domain of this irqdomain is
> 
>      stdev->pdev.dev.irqdomain->parent

It can work (pending some solution to the iommu stuff), but IMHO it is
strange/hacky to put HW objects like irqdomain on what is a character
struct device with a set major/minor in dev->devt and associated
struct cdev.

Conceptually it makes no sense to me, cdevs are software constructs,
they should never go into HW areas..

Jason