linux-kernel - Re: [PATCH v5 2/3] Documentation: add a isolation strategy sysfs node for uacce

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Date:   Fri, 8 Jul 2022 17:38:17 +0800
From:   "yekai(A)" <yekai13@...wei.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     <herbert@...dor.apana.org.au>, <linux-crypto@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <wangzhou1@...ilicon.com>
Subject: Re: [PATCH v5 2/3] Documentation: add a isolation strategy sysfs node
 for uacce



On 2022/7/8 15:30, Greg KH wrote:
> On Fri, Jul 08, 2022 at 03:08:19PM +0800, Kai Ye wrote:
>> Update documentation describing sysfs node that could help to
>> configure isolation strategy for users in the user space. And
>> describing sysfs node that could read the device isolated state.
>>
>> Signed-off-by: Kai Ye <yekai13@...wei.com>
>> ---
>>  Documentation/ABI/testing/sysfs-driver-uacce | 18 ++++++++++++++++++
>>  1 file changed, 18 insertions(+)
>>
>> diff --git a/Documentation/ABI/testing/sysfs-driver-uacce b/Documentation/ABI/testing/sysfs-driver-uacce
>> index 08f2591138af..a8056271a963 100644
>> --- a/Documentation/ABI/testing/sysfs-driver-uacce
>> +++ b/Documentation/ABI/testing/sysfs-driver-uacce
>> @@ -19,6 +19,24 @@ 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:           Jul 2022
>> +KernelVersion:  5.20
>> +Contact:        linux-accelerators@...ts.ozlabs.org
>> +Description:    A sysfs node that used to configures the hardware error
>
> This is not a "node" it is just a file.
>
>
>> +                isolation strategy. This strategy is a configured integer value.
>> +                The default is 0. The maximum value is 65535. This value
>> +                indicates the number of device slot resets per unit time
>> +                that your service can tolerate.
>
> I do not understand this, sorry.  What do you mean by "that your service
> can tolerate"?

it means the user can tolerable reset frequency, because the reset will 
interrupt services.

>
>> +
>> +What:           /sys/class/uacce/<dev_name>/isolate
>> +Date:           Jul 2022
>> +KernelVersion:  5.20
>> +Contact:        linux-accelerators@...ts.ozlabs.org
>> +Description:    A sysfs node that read the device isolated state. The value 0
>> +                means that the device is working. The value 1 means that the
>> +                device has been isolated.
>
> So 1 means "not working"?  This seems odd, perhaps you can rephrase this
> a bit better?

1 means the device is unavailable. 0 means the device is available.
>
> thanks,
>
> greg k-h
> .
>

Thanks

Kai