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Subject: Re: [PATCH v6 2/3] Documentation: add a isolation strategy sysfs node
 for uacce
To:     Greg KH <gregkh@linuxfoundation.org>
References: <20220730083246.55646-1-yekai13@huawei.com>
 <20220730083246.55646-3-yekai13@huawei.com> <YuUQuNPIV6Xrfmwt@kroah.com>
CC:     <herbert@gondor.apana.org.au>, <linux-crypto@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <wangzhou1@hisilicon.com>,
        <liulongfang@huawei.com>
From:   "yekai (A)" <yekai13@huawei.com>
Message-ID: <901896fa-2acc-127c-a8ea-8143cda47b1b@huawei.com>
Date:   Mon, 1 Aug 2022 10:20:27 +0800
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On 2022/7/30 19:06, Greg KH wrote:
> On Sat, Jul 30, 2022 at 04:32:45PM +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@huawei.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..1601f9dac29c 100644
>> --- a/Documentation/ABI/testing/sysfs-driver-uacce
>> +++ b/Documentation/ABI/testing/sysfs-driver-uacce
>> @@ -19,6 +19,23 @@ Contact:        linux-accelerators@lists.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@lists.ozlabs.org
>> +Description:    (RW) Configure the frequency size for the hardware error
>> +                isolation strategy. This size is a configured integer value.
>> +                The default is 0. The maximum value is 65535. This value is a
>> +                threshold based on your driver handling strategy.
> what is a "driver handling strategy"?  What exactly is this units in?
> Any documentation for how to use this?
>
> thanks,
>
> greg k-h
> .
The unit is the number of times, also means frequency size.
e.g.
In the  hisilicon acc engine, First we will time-stamp every slot AER error. Then check the AER error log when the device
AER error occurred. if the device slot AER error count  exceeds the preset the number of times in one hour, the isolated state
will be set to true. So the device will be isolated.  And the AER error log that exceed one hour  will be cleared.  Of course,
different strategy can be defined in different drivers.

thanks
Kai