From: Jie Deng <jie.deng@intel.com>
To: Viresh Kumar <viresh.kumar@linaro.org>, Arnd Bergmann <arnd@arndb.de>
Cc: "Linux I2C" <linux-i2c@vger.kernel.org>,
virtualization@lists.linux-foundation.org,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Michael S. Tsirkin" <mst@redhat.com>,
"Wolfram Sang" <wsa@kernel.org>,
"Jason Wang" <jasowang@redhat.com>,
"Wolfram Sang" <wsa+renesas@sang-engineering.com>,
"Andy Shevchenko" <andriy.shevchenko@linux.intel.com>,
conghui.chen@intel.com, kblaiech@mellanox.com,
jarkko.nikula@linux.intel.com,
"Sergey Semin" <Sergey.Semin@baikalelectronics.ru>,
"Mike Rapoport" <rppt@kernel.org>,
loic.poulain@linaro.org, "Tali Perry" <tali.perry1@gmail.com>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
"Bjorn Andersson" <bjorn.andersson@linaro.org>,
yu1.wang@intel.com, shuo.a.liu@intel.com,
"Stefan Hajnoczi" <stefanha@redhat.com>
Subject: Re: [PATCH v5] i2c: virtio: add a virtio i2c frontend driver
Date: Tue, 2 Mar 2021 13:06:49 +0800 [thread overview]
Message-ID: <5e66fc1b-81d3-341e-4864-adb021e9ce1e@intel.com> (raw)
In-Reply-To: <20210302042233.7ppagwjk3rah3uh3@vireshk-i7>
On 2021/3/2 12:22, Viresh Kumar wrote:
> 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@intel.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.
Yeah. Actually, the backend only needs "struct virtio_i2c_out_hdr out_hdr"
and "struct virtio_i2c_in_hdr in_hdr" for communication. So we only need
to keep
the first two in uapi and move "struct virtio_i2c_req" into the driver.
But Jason wanted to include "struct virtio_i2c_req" in uapi. He
explained in this link
https://lists.linuxfoundation.org/pipermail/virtualization/2020-October/050222.html.
Do you agree with that explanation ?
next prev parent reply other threads:[~2021-03-02 8:21 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-01 6:41 [PATCH v5] i2c: virtio: add a virtio i2c frontend driver Jie Deng
2021-03-01 11:54 ` Viresh Kumar
2021-03-01 12:09 ` Andy Shevchenko
2021-03-01 12:10 ` Andy Shevchenko
2021-03-01 15:46 ` Arnd Bergmann
2021-03-02 3:46 ` Viresh Kumar
2021-03-02 3:44 ` Viresh Kumar
2021-03-02 2:21 ` Jie Deng
2021-03-02 3:43 ` Viresh Kumar
2021-03-02 6:28 ` Jie Deng
[not found] ` <b99b18e1-06a5-f526-a885-dc663da3612b@intel.com>
2021-03-02 7:24 ` Viresh Kumar
2021-03-02 8:17 ` Jie Deng
2021-03-01 12:07 ` Andy Shevchenko
2021-03-02 7:16 ` Jie Deng
2021-03-01 15:19 ` Arnd Bergmann
2021-03-02 4:01 ` Viresh Kumar
2021-03-02 4:22 ` Viresh Kumar
2021-03-02 5:06 ` Jie Deng [this message]
2021-03-02 5:16 ` Viresh Kumar
2021-03-02 5:42 ` Jason Wang
[not found] ` <56fdef9a-b373-32f2-6dac-e687caa813c8@intel.com>
2021-03-02 9:51 ` Stefan Hajnoczi
2021-03-02 10:54 ` Arnd Bergmann
2021-03-03 17:48 ` Stefan Hajnoczi
2021-03-02 4:42 ` Viresh Kumar
2021-03-02 5:21 ` Jie Deng
2021-03-02 5:25 ` Viresh Kumar
2021-03-03 7:54 ` Viresh Kumar
2021-03-03 8:46 ` Jie Deng
2021-03-03 9:38 ` Viresh Kumar
2021-03-04 1:47 ` Jie Deng
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