linux-kernel - Re: [PATCH] remoteproc: virtio: support sharing vdev buffer

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Date:   Thu, 30 Jul 2020 15:54:42 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Peng Fan <peng.fan@....com>
Cc:     "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        "ohad@...ery.com" <ohad@...ery.com>,
        "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] remoteproc: virtio: support sharing vdev buffer

On Thu, 30 Jul 2020 at 00:22, Peng Fan <peng.fan@....com> wrote:
>
> Hi Mathieu,
>
> > Subject: Re: [PATCH] remoteproc: virtio: support sharing vdev buffer
> >
> > Hi Peng,
> >
> > On Wed, Jul 22, 2020 at 09:15:43PM +0800, Peng Fan wrote:
> > > Support sharing vdev buffer between multiple vdevs by using name
> > > "vdevbuffer".
> > >
> > > Reviewed-by: Richard Zhu <hongxing.zhu@....com>
> > > Signed-off-by: Peng Fan <peng.fan@....com>
> > > ---
> > >  drivers/remoteproc/remoteproc_virtio.c | 2 ++
> > >  1 file changed, 2 insertions(+)
> > >
> > > diff --git a/drivers/remoteproc/remoteproc_virtio.c
> > > b/drivers/remoteproc/remoteproc_virtio.c
> > > index dfd3808c34fd..5d78ebea111e 100644
> > > --- a/drivers/remoteproc/remoteproc_virtio.c
> > > +++ b/drivers/remoteproc/remoteproc_virtio.c
> > > @@ -343,6 +343,8 @@ int rproc_add_virtio_dev(struct rproc_vdev *rvdev,
> > > int id)
> > >
> > >     /* Try to find dedicated vdev buffer carveout */
> > >     mem = rproc_find_carveout_by_name(rproc, "vdev%dbuffer",
> > > rvdev->index);
> > > +   if (!mem)
> > > +           mem = rproc_find_carveout_by_name(rproc, "vdevbuffer");
> >
> > We already have a way to share buffers [1], do you think it would work for you?
> > I would rather proceed that way to avoid introducing a 3rd way to deal with
> > vdev buffers.
>
> That should work for me. I just need to move the vdevbuffer to the 1st one
> inside the memory-region.

Perfect

>
> BTW: Do you have time to give a review for
> https://patchwork.kernel.org/patch/11688751/
>

Unfortunately not in a little while.  There are a couple of beefy
patchset in the queue ahead of yours and to make matters worse I am
away next week.

> Thanks,
> Peng.
>
> >
> > Thanks,
> > Mathieu
> >
> > [1].
> > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Felixir.b
> > ootlin.com%2Flinux%2Fv5.8-rc4%2Fsource%2Fdrivers%2Fremoteproc%2Frem
> > oteproc_virtio.c%23L389&amp;data=02%7C01%7Cpeng.fan%40nxp.com%7C
> > 760ae238005c49fe20db08d833e193ca%7C686ea1d3bc2b4c6fa92cd99c5c30
> > 1635%7C0%7C0%7C637316391223184319&amp;sdata=UTN8YVaEynomrwFx
> > 7aTCJ7fp0fjfIS8fscfGG67naKk%3D&amp;reserved=0
> >
> > >     if (mem) {
> > >             phys_addr_t pa;
> > >
> > > --
> > > 2.16.4
> > >