linux-kernel - Re: [PATCH v2 07/13] trinity: Add sysfs module

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Date:   Mon, 19 Sep 2022 15:44:15 +0900
From:   Jiho Chu <jiho.chu@...sung.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     arnd@...db.de, ogabbay@...nel.org, krzysztof.kozlowski@...aro.org,
        broonie@...nel.org, linux-kernel@...r.kernel.org,
        yelini.jeong@...sung.com, myungjoo.ham@...sung.com
Subject: Re: [PATCH v2 07/13] trinity: Add sysfs module

On Sun, 18 Sep 2022 12:33:06 +0200
Greg KH <gregkh@...uxfoundation.org> wrote:

> On Sat, Sep 17, 2022 at 04:23:50PM +0900, Jiho Chu wrote:
> > This patch includes sysfs interfaces.
> > 
> > sysfs interface provides NPU's internal statistics, status and control
> > attribes.
> > 
> > The sysfs information provided by the Trinity are:
> > - IDU version
> > - profiling result
> > - allocated debugfs buffer
> > 
> > The control attributes are including:
> > - initialize profile operation
> > - NPU control (suspend/resume/stop)
> > 
> > Signed-off-by: Jiho Chu <jiho.chu@...sung.com>
> > Signed-off-by: Yelin Jeong <yelini.jeong@...sung.com>
> > Signed-off-by: Dongju Chae <dongju.chae@...sung.com>
> > Signed-off-by: MyungJoo Ham <myungjoo.ham@...sung.com>
> > ---
> >  .../ABI/testing/sysfs-driver-trinity          |  55 ++
> >  drivers/misc/trinity/Makefile                 |   1 +
> >  drivers/misc/trinity/trinity_sysfs.c          | 667 ++++++++++++++++++
> >  3 files changed, 723 insertions(+)
> >  create mode 100644 Documentation/ABI/testing/sysfs-driver-trinity
> >  create mode 100644 drivers/misc/trinity/trinity_sysfs.c
> > 
> > diff --git a/Documentation/ABI/testing/sysfs-driver-trinity b/Documentation/ABI/testing/sysfs-driver-trinity
> > new file mode 100644
> > index 000000000000..754e6f36a1dc
> > --- /dev/null
> > +++ b/Documentation/ABI/testing/sysfs-driver-trinity
> > @@ -0,0 +1,55 @@
> > +What:           /sys/devices/platform/trinity/*.triv2/debug/debugfs_max
> > +Date:           July 2022
> > +KernelVersion:  5.19-rc8
> > +Contact:        Jiho Chu <jiho.chu@...sung.com>
> > +Description:    Shows current allocated debugfs entry size.
> > +                Note that, Writing max entry size allocates NPU's hardware
> > +                memory for debugfs entries.
> 
> Why are debugfs things being mentioned in sysfs entries?
> 
> That's not needed, nor is it allowed, sorry.
> 
> Please put all debugfs stuff in debugfs.
> 
> Also, sysfs is "one value per file", you violate that in lots of ways
> with this patch.  Please fix all of that, and use the sysfs_emit() calls
> instead of snprintf() for your sysfs show calls.
> 
> thanks,
> 
> greg k-h
> 

Thanks for checking.
I'll fix sysfs entries.

Best regards,
Jiho Chu