linux-kernel - Re: [PATCH v7 4/5] Documentation: add debugfs description for hisi_acc_vfio

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Date:   Wed, 1 Feb 2023 11:26:51 +0800
From:   liulongfang <liulongfang@...wei.com>
To:     Alex Williamson <alex.williamson@...hat.com>
CC:     <jgg@...dia.com>, <shameerali.kolothum.thodi@...wei.com>,
        <jonathan.cameron@...wei.com>, <cohuck@...hat.com>,
        <linux-kernel@...r.kernel.org>, <linuxarm@...neuler.org>
Subject: Re: [PATCH v7 4/5] Documentation: add debugfs description for
 hisi_acc_vfio_pci

On 2023/1/27 3:28, Alex Williamson wrote:
> On Fri, 20 Jan 2023 11:29:29 +0800
> Longfang Liu <liulongfang@...wei.com> wrote:
> 
>> Add a debugfs document description file to help users understand
>> how to use the accelerator live migration driver's debugfs.
>>
>> Signed-off-by: Longfang Liu <liulongfang@...wei.com>
>> ---
>>  .../ABI/testing/debugfs-hisi-migration        | 32 +++++++++++++++++++
>>  1 file changed, 32 insertions(+)
>>  create mode 100644 Documentation/ABI/testing/debugfs-hisi-migration
>>
>> diff --git a/Documentation/ABI/testing/debugfs-hisi-migration b/Documentation/ABI/testing/debugfs-hisi-migration
>> new file mode 100644
>> index 000000000000..d644a497c464
>> --- /dev/null
>> +++ b/Documentation/ABI/testing/debugfs-hisi-migration
>> @@ -0,0 +1,32 @@
>> +What:		/sys/kernel/debug/vfio_mig/<bdf>/state
>> +Date:		Jan 2023
>> +Contact:	linux-kernel@...r.kernel.org
>> +Description:	Read the live migration status of the VF device.
>> +		The status of these live migrations includes:
>> +		ERROR, RUNNING, STOP, STOP_COPY, RESUMING.
> 
> state is added by vfio-pci-core in this series, so the documentation
> can't be limited to hisi_acc.
> 
>> +
>> +What:		/sys/kernel/debug/vfio_mig/<bdf>/mig_data
>> +Date:		Jan 2023
>> +Contact:	linux-kernel@...r.kernel.org
>> +Description:	Read the live migration data of the VF device.
>> +		The output format of the data is defined by the live
>> +		migration driver.
>> +
>> +What:		/sys/kernel/debug/vfio_mig/<bdf>/mig_attr
>> +Date:		Jan 2023
>> +Contact:	linux-kernel@...r.kernel.org
>> +Description:	Read the live migration attributes of the VF device.
>> +		The output format of the attributes is defined by the live
>> +		migration driver.
>> +
>> +What:		/sys/kernel/debug/vfio_mig/<bdf>/debug
>> +Date:		Jan 2023
>> +Contact:	linux-kernel@...r.kernel.org
>> +Description:	This debug file supports "echo" command	write operations.
>> +		The command is actually represented by an integer number, and the
>> +		specific meaning is defined by the corresponding device driver.
>> +		For example, three commands are defined in the HiSilicon accelerator
>> +		live migration driver:
>> +		0: State save
>> +		1: State resume
>> +		2: IO test
> 
> I think the goal here is to create some sort of standard interface for
> migration, so these should also be documented for all devices, and any
> device specific behavior noted.  Otherwise these should all be prefixed
> hisi_acc_ to denote them as device specific implementations.  Thanks,
> 

Ok, the ABI file name needs to be changed, and the internal description needs
to be updated, not limited to hisi_acc.

> Alex
> 
Thansk,
Longfang.
> .
>