linux-kernel - Re: [PATCH] remoteproc: imx_rproc: iterate all notifiyids in rx callback

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Message-ID: <CANLsYkzZ=resYxStMDEkqEksWiVngH_hJ+wB=z94fqpTtU7PnQ@mail.gmail.com>
Date:   Wed, 28 Jun 2023 13:31:03 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Peng Fan <peng.fan@....com>
Cc:     "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        "andersson@...nel.org" <andersson@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        Daniel Baluta <daniel.baluta@....com>,
        Iuliana Prodan <iuliana.prodan@....com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] remoteproc: imx_rproc: iterate all notifiyids in rx callback

On Tue, 27 Jun 2023 at 18:55, Peng Fan <peng.fan@....com> wrote:
>
> > Subject: Re: [PATCH] remoteproc: imx_rproc: iterate all notifiyids in rx
> > callback
> >
> > On Sun, Jun 25, 2023 at 08:35:14PM +0800, Peng Fan (OSS) wrote:
> > > From: Peng Fan <peng.fan@....com>
> > >
> > > The current code has an assumption that there is one tx and one rx
> > > vring, but it is not always true. There maybe more vrings. So iterate
> > > all notifyids to not miss any vring events.
> >
> > Can you be more specific on the use case where more than 2 virqueues are
> > allocated?  The remoteproc core can handle more than 2 but right now the
> > only configuration I see doesn't support more than that.
>
> In downstream tree, we have below remoteproc node. It use
> vdev0 vring0/vring1 for vdev0, vdev1 vring0/vring1 for vdev1.
> vdev0 and vdev1 are for different services, saying vdev0 for gpio rpmsg,
> vdev1 for i2c rpmsg.

So you are talking about cases where more than one vdev are
instantiated and a single callback channel is available.  Please fix
your changelog description.  The way it is currently written one can
easily think you are referring to more than 2 virtqueues for each
vdev.

One more comment below.

>         cm33: imx93-cm33 {
>                 compatible = "fsl,imx93-cm33";
>                 mbox-names = "tx", "rx", "rxdb";
>                 mboxes = <&mu1 0 1
>                           &mu1 1 1
>                           &mu1 3 1>;
>                 memory-region = <&vdevbuffer>, <&vdev0vring0>, <&vdev0vring1>,
>                                 <&vdev1vring0>, <&vdev1vring1>, <&rsc_table>;
>                 fsl,startup-delay-ms = <500>;
>         };
>
> Thanks,
> Peng.
>
> >
> > >
> > > Signed-off-by: Peng Fan <peng.fan@....com>
> > > ---
> > >  drivers/remoteproc/imx_rproc.c | 14 ++++++++++++--
> > >  1 file changed, 12 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/remoteproc/imx_rproc.c
> > > b/drivers/remoteproc/imx_rproc.c index f9874fc5a80f..e3f40d0e9f3d
> > > 100644
> > > --- a/drivers/remoteproc/imx_rproc.c
> > > +++ b/drivers/remoteproc/imx_rproc.c
> > > @@ -725,13 +725,23 @@ static int imx_rproc_addr_init(struct imx_rproc
> > *priv,
> > >     return 0;
> > >  }
> > >
> > > +static int imx_rproc_notified_idr_cb(int id, void *ptr, void *data) {
> > > +   struct rproc *rproc = data;
> > > +
> > > +   if (rproc_vq_interrupt(rproc, id) == IRQ_NONE)
> > > +           dev_dbg(&rproc->dev, "no message in vqid: %d\n", id);
> > > +

A debug message is already displayed by vring_interrupt(), please remove.

Thanks,
Mathieu

> > > +   return 0;
> > > +}
> > > +
> > >  static void imx_rproc_vq_work(struct work_struct *work)  {
> > >     struct imx_rproc *priv = container_of(work, struct imx_rproc,
> > >                                           rproc_work);
> > > +   struct rproc *rproc = priv->rproc;
> > >
> > > -   rproc_vq_interrupt(priv->rproc, 0);
> > > -   rproc_vq_interrupt(priv->rproc, 1);
> > > +   idr_for_each(&rproc->notifyids, imx_rproc_notified_idr_cb, rproc);
> > >  }
> > >
> > >  static void imx_rproc_rx_callback(struct mbox_client *cl, void *msg)
> > > --
> > > 2.37.1
> > >