linux-kernel - Re: [PATCH 1/3] i915/gvt: Introduce the mmio

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Date:   Tue, 08 Feb 2022 10:04:07 +0200
From:   Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
To:     "Wang, Zhi A" <zhi.a.wang@...el.com>,
        Christoph Hellwig <hch@....de>,
        Jani Nikula <jani.nikula@...ux.intel.com>
Cc:     Christoph Hellwig <hch@....de>,
        Zhi Wang <zhi.wang.linux@...il.com>,
        "jgg@...dia.com" <jgg@...dia.com>,
        "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
        "intel-gvt-dev@...ts.freedesktop.org" 
        <intel-gvt-dev@...ts.freedesktop.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Vivi, Rodrigo" <rodrigo.vivi@...el.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        "Xu, Terrence" <terrence.xu@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...el.com>
Subject: Re: [PATCH 1/3] i915/gvt: Introduce the mmio_table.c to support VFIO new mdev API

Quoting Jani Nikula (2022-02-07 12:48:08)
> On Mon, 07 Feb 2022, Christoph Hellwig <hch@....de> wrote:
> > On Mon, Feb 07, 2022 at 08:28:13AM +0000, Wang, Zhi A wrote:
> >> 1) About having the mmio_table.h, I would like to keep the stuff in a
> >> dedicated header as putting them in intel_gvt.h might needs i915 guys
> >> to maintain it.
> >> 2) The other one is about if we should move the mmio_table.c into
> >> i915 folder. I guess we need the some comments from Jani. In the
> >> current version that I am testing, it's still in GVT folder. Guess we
> >> can submit a patch to move it to i915 folder later if Jani is ok
> >> about that.
> >
> > Yes, let's have Jani chime in on these.  They're basically one and the
> > same issue.  This code will have to be built into into the core i915
> > driver even with my planned split, which is kindof the point of this
> > exercise.  I think it makes sense to use the subdirectories as boundaries
> > for where the code ends up and not to declarare maintainership boundaries,
> > but it will be up to the i915 and gvt maintainers to decide that.
> 
> Agreed. If there's going to be a gvt.ko, I think all of gvt/ should be
> part of that module, nothing more, nothing less.
> 
> The gvt related files in i915/ should probably be named intel_gvt* or
> something, ditto for function naming, and we'll probably want patches
> touching them be Cc'd to intel-gfx list.
> 
> Joonas, Rodrigo, Tvrtko, thoughts?

Agreed on above. I don't think we expect much changes on the golden MMIO
state capture set.

Regards, Joonas