linux-kernel - Re: [PATCH v5] i2c: virtio: add a virtio i2c frontend driver

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Date:   Tue, 2 Mar 2021 09:52:33 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Jie Deng <jie.deng@...el.com>,
        Linux I2C <linux-i2c@...r.kernel.org>,
        virtualization@...ts.linux-foundation.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Wolfram Sang <wsa@...nel.org>,
        Jason Wang <jasowang@...hat.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        conghui.chen@...el.com, kblaiech@...lanox.com,
        jarkko.nikula@...ux.intel.com,
        Sergey Semin <Sergey.Semin@...kalelectronics.ru>,
        Mike Rapoport <rppt@...nel.org>, loic.poulain@...aro.org,
        Tali Perry <tali.perry1@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        yu1.wang@...el.com, shuo.a.liu@...el.com
Subject: Re: [PATCH v5] i2c: virtio: add a virtio i2c frontend driver

On 02-03-21, 09:31, Viresh Kumar wrote:
> On 01-03-21, 16:19, Arnd Bergmann wrote:
> > On Mon, Mar 1, 2021 at 7:41 AM Jie Deng <jie.deng@...el.com> wrote:
> > 
> > > --- /dev/null
> > > +++ b/include/uapi/linux/virtio_i2c.h
> > > @@ -0,0 +1,56 @@
> > > +/* SPDX-License-Identifier: GPL-2.0-or-later WITH Linux-syscall-note */
> > > +/*
> > > + * Definitions for virtio I2C Adpter
> > > + *
> > > + * Copyright (c) 2021 Intel Corporation. All rights reserved.
> > > + */
> > > +
> > > +#ifndef _UAPI_LINUX_VIRTIO_I2C_H
> > > +#define _UAPI_LINUX_VIRTIO_I2C_H
> > 
> > Why is this a uapi header? Can't this all be moved into the driver
> > itself?
> > 
> > > +/**
> > > + * struct virtio_i2c_req - the virtio I2C request structure
> > > + * @out_hdr: the OUT header of the virtio I2C message
> > > + * @write_buf: contains one I2C segment being written to the device
> > > + * @read_buf: contains one I2C segment being read from the device
> > > + * @in_hdr: the IN header of the virtio I2C message
> > > + */
> > > +struct virtio_i2c_req {
> > > +       struct virtio_i2c_out_hdr out_hdr;
> > > +       u8 *write_buf;
> > > +       u8 *read_buf;
> > > +       struct virtio_i2c_in_hdr in_hdr;
> > > +};
> > 
> > In particular, this structure looks like it is only ever usable between
> > the transfer functions in the driver itself, it is shared with neither
> > user space nor the virtio host side.
> 
> Why is it so ? Won't you expect hypervisors or userspace apps to use
> these ?

This comment applies only for the first two structures as the third
one is never exchanged over virtio.

-- 
viresh