linux-kernel - Re: [PATCH v2 15/15] vfio: Add struct device to vfio

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Date:   Thu, 8 Sep 2022 09:37:07 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Eric Auger <eric.auger@...hat.com>
Cc:     Yi Liu <yi.l.liu@...el.com>, Kevin Tian <kevin.tian@...el.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Eric Farman <farman@...ux.ibm.com>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        Halil Pasic <pasic@...ux.ibm.com>,
        Vineeth Vijayan <vneethv@...ux.ibm.com>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Tony Krowiak <akrowiak@...ux.ibm.com>,
        Jason Herne <jjherne@...ux.ibm.com>,
        Harald Freudenberger <freude@...ux.ibm.com>,
        Diana Craciun <diana.craciun@....nxp.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Longfang Liu <liulongfang@...wei.com>,
        Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
        Yishai Hadas <yishaih@...dia.com>,
        Kirti Wankhede <kwankhede@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        Abhishek Sahu <abhsahu@...dia.com>,
        intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH v2 15/15] vfio: Add struct device to vfio_device

On Thu, Sep 08, 2022 at 11:39:07AM +0200, Eric Auger wrote:

> >> I am not totally clear about remaining 'struct device *dev;' in
> >> vfio_device struct. I see it used in some places. Is it supposed to
> >> disappear at some point?
> >
> > no, Eric. *dev will not disappear, it stores the dev pointet passed in by
> > caller of vfio_init_device().
> 
> yeah I see but you have device->device.parent = device->dev;

IIRC we have a number of these redundancies now, often the drivers
store another copy of the dev too.

A significant use of dev is for printing things, what should be done
here is to create a subsystem wide vfio_warn/etc that takes in the
vfio_device, and then print properly from there. Now that we have a
struct device all the prints should also include the VFIO struct
device name, and then the PCI device perhaps in brackets.

Jason