linux-kernel - Re: [PATCH v3 1/2] remoteproc: Add remoteproc character device interface

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Date:   Wed, 1 Jul 2020 11:53:18 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Arnaud POULIQUEN <arnaud.pouliquen@...com>
Cc:     Siddharth Gupta <sidgup@...eaurora.org>,
        "rishabhb@...eaurora.org" <rishabhb@...eaurora.org>,
        "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mathieu.poirier@...aro.org" <mathieu.poirier@...aro.org>,
        "ohad@...ery.com" <ohad@...ery.com>,
        "tsoni@...eaurora.org" <tsoni@...eaurora.org>,
        "psodagud@...eaurora.org" <psodagud@...eaurora.org>,
        "linux-remoteproc-owner@...r.kernel.org" 
        <linux-remoteproc-owner@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] remoteproc: Add remoteproc character device
 interface

On Wed 01 Jul 05:13 PDT 2020, Arnaud POULIQUEN wrote:

> 
> 
> On 7/1/20 12:02 AM, Siddharth Gupta wrote:
> > 
> > On 6/30/2020 12:43 AM, Arnaud POULIQUEN wrote:
> >>
> >> On 6/30/20 7:38 AM, Siddharth Gupta wrote:
> >>> On 6/17/2020 1:44 AM, Arnaud POULIQUEN wrote:
> >>>> On 6/16/20 9:56 PM, rishabhb@...eaurora.org wrote:
> >>>>> On 2020-04-30 01:30, Arnaud POULIQUEN wrote:
[..]
> >>>>>> IOCTLs should probaly be documented.
> >>>>> I have added documentation to
> >>>>> Documentation/userspace-api/ioctl/ioctl-number.rst
> >>>>> Is there another place where I need to add documentation for this?
> >>>> Could you add in this file comments that describe
> >>>> the IOCTL usage and associated parameter?
> >>>>
> >>>> Regards,
> >>>> Arnaud
> > 
> > I don't see any for of comments that describe in detail the IOCTL usage, 
> > i.e.,
> > input parameters, etc. Could you provide an example so I can follow it?
> > 
> > If not, should I instead put them in Documentation/remoteproc.txt?
> 
> Bjorn and Mathieu are the right persons to decide on the best place.
> 
> Here are 2 exemples of "inline" documented IOCTRLs.
> 
> https://elixir.bootlin.com/linux/latest/source/arch/s390/include/uapi/asm/tape390.h#L15
> https://elixir.bootlin.com/linux/latest/source/drivers/net/wan/cosa.h#L63 
> 
> Could be something like that:
> 
> /*
>  * The RPROC_SET_SHUTDOWN_ON_RELEASE ioctl allows to enable/disable the 
>  * automatic remote processors shutdown when the controlling userpsace
>  * closes the char device interface.
>  *
>  * input parameter: integer
>  *   0    : disable automatic shutdown
>  *   other: enable automatic shutdown
>  */ 
> #define RPROC_SET_SHUTDOWN_ON_RELEASE _IOW(RPROC_MAGIC, 1, int)
> 
> /*
>  * The RPROC_GET_SHUTDOWN_ON_RELEASE ioctl gets information about the 
>  * automatic remote processors shutdown when the controlling userpsace
>  * closes the char device interface.
>  *
>  * output parameter: integer
>  *   0: automatic shutdown disable
>  *   1: automatic shutdown enable
>  */ 
> #define RPROC_GET_SHUTDOWN_ON_RELEASE _IOR(RPROC_MAGIC, 2, int)
> 

I like this. Thanks for digging up an example Arnaud!

Regards,
Bjorn