linux-kernel - Re: [PATCH v2 2/3] Documentation: add a isolation strategy vfs node for uacce

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Date:   Wed, 15 Jun 2022 09:48:13 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     Kai Ye <yekai13@...wei.com>, <herbert@...dor.apana.org.au>,
        <linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
        <wangzhou1@...ilicon.com>, <linux-crypto@...r.kernel.org>,
        <zhangfei.gao@...aro.org>, <linux-accelerators@...ts.ozlabs.org>
Subject: Re: [PATCH v2 2/3] Documentation: add a isolation strategy vfs node
 for uacce

On Tue, 14 Jun 2022 14:41:52 +0200
Greg KH <gregkh@...uxfoundation.org> wrote:

> On Tue, Jun 14, 2022 at 08:29:39PM +0800, Kai Ye wrote:
> > Update documentation describing DebugFS that could help to
> > configure hard error frequency for users in th user space.
> > 
> > Signed-off-by: Kai Ye <yekai13@...wei.com>
> > ---
> >  Documentation/ABI/testing/sysfs-driver-uacce | 17 +++++++++++++++++
> >  1 file changed, 17 insertions(+)
> > 
> > diff --git a/Documentation/ABI/testing/sysfs-driver-uacce b/Documentation/ABI/testing/sysfs-driver-uacce
> > index 08f2591138af..0c4226364182 100644
> > --- a/Documentation/ABI/testing/sysfs-driver-uacce
> > +++ b/Documentation/ABI/testing/sysfs-driver-uacce
> > @@ -19,6 +19,23 @@ Contact:        linux-accelerators@...ts.ozlabs.org
> >  Description:    Available instances left of the device
> >                  Return -ENODEV if uacce_ops get_available_instances is not provided
> >  
> > +What:           /sys/class/uacce/<dev_name>/isolate_strategy
> > +Date:           Jun 2022
> > +KernelVersion:  5.19
> > +Contact:        linux-accelerators@...ts.ozlabs.org
> > +Description:    A vfs node that used to configures the hardware  
> 
> What is a "vfs node"?
> 
> > +                error frequency. This frequency is abstract. Like once an hour
> > +                or once a day. The specific isolation strategy can be defined in
> > +                each driver module.  
> 
> No, you need to be specific here and describe the units and the format.
> Otherwise it is no description at all :(

Also, rename it.   A frequency isn't a strategy.  Strategy would be something
like:

* First fault
* Faults in moving time window.
* Faults in fixed time window.

some of which would then need separate controls for the threshold and the
time window - those should be in separate sysfs attributes.

> 
> > +
> > +What:           /sys/class/uacce/<dev_name>/isolate
> > +Date:           Jun 2022
> > +KernelVersion:  5.19  
> 
> 5.19 will not have this change.
> 
> > +Contact:        linux-accelerators@...ts.ozlabs.org
> > +Description:    A vfs node that show the device isolated state. The value 0
> > +                means that the device is working. The value 1 means that the
> > +                device has been isolated.  
> 
> What does "working" or "isolated" mean?
> 
> thanks,
> 
> greg k-h