linux-kernel - Re: [PATCH v8 4/5] Documentation: add debugfs description for vfio

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Date:   Tue, 14 Mar 2023 18:56:44 +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 v8 4/5] Documentation: add debugfs description for vfio

On 2023/3/11 7:39, Alex Williamson wrote:
> On Fri, 17 Feb 2023 16:48:30 +0800
> Longfang Liu <liulongfang@...wei.com> wrote:
> 
>> Add two 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        | 28 +++++++++++++++++++
>>  Documentation/ABI/testing/debugfs-vfio        | 17 +++++++++++
>>  2 files changed, 45 insertions(+)
>>  create mode 100644 Documentation/ABI/testing/debugfs-hisi-migration
>>  create mode 100644 Documentation/ABI/testing/debugfs-vfio
>>
>> diff --git a/Documentation/ABI/testing/debugfs-hisi-migration b/Documentation/ABI/testing/debugfs-hisi-migration
>> new file mode 100644
>> index 000000000000..0f45f30ff6d4
>> --- /dev/null
>> +++ b/Documentation/ABI/testing/debugfs-hisi-migration
>> @@ -0,0 +1,28 @@
>> +What:		/sys/kernel/debug/vfio/<bdf>/migration_data
> 
> s/bdf/name/ throughout.
> 
OK, I will change it in the next version.

>> +Date:		Feb 2023
>> +KernelVersion:  6.2
>> +Contact:	linux-kernel@...r.kernel.org
> 
> Is there not someone at Huawei willing to be the contact point for the
> hisi_acc specific attributes?
> 

Sorry, I misunderstood here.
Before, I thought it could only be the contact information of the public community.
I will add my email address in the next version.

>> +Description:	Read the live migration data of the vfio device.
>> +		The output format of the data is defined by the live
>> +		migration driver.
>> +
>> +What:		/sys/kernel/debug/vfio/<bdf>/migration_attr
>> +Date:		Feb 2023
>> +KernelVersion:  6.2
>> +Contact:	linux-kernel@...r.kernel.org
>> +Description:	Read the live migration attributes of the vfio device.
>> +		The output format of the attributes is defined by the live
>> +		migration driver.
>> +
>> +What:		/sys/kernel/debug/vfio/<bdf>/migration_debug
>> +Date:		Feb 2023
>> +KernelVersion:  6.2
>> +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
>> diff --git a/Documentation/ABI/testing/debugfs-vfio b/Documentation/ABI/testing/debugfs-vfio
>> new file mode 100644
>> index 000000000000..e22531d16674
>> --- /dev/null
>> +++ b/Documentation/ABI/testing/debugfs-vfio
>> @@ -0,0 +1,17 @@
>> +What:		/sys/kernel/debug/vfio
>> +Date:		Feb 2023
>> +KernelVersion:  6.2
>> +Contact:	linux-kernel@...r.kernel.org
> 
> These should likely at least be the kvm list as the official list of
> vfio if you're not interested in being the contact point.
> 

I misunderstood here.
I will add my email address in the next version.

Thanks,
Longfang.
> Thanks,
> Alex
> 
>> +Description:	This debugfs file directory is used for debugging
>> +		of vfio devices that support live migration.
>> +		Each device that supports live migration can create a device
>> +		subdirectory under this directory by referencing the public
>> +		registration interface.
>> +
>> +What:		/sys/kernel/debug/vfio/<bdf>/migration_state
>> +Date:		Feb 2023
>> +KernelVersion:  6.2
>> +Contact:	linux-kernel@...r.kernel.org
>> +Description:	Read the live migration status of the vfio device.
>> +		The status of these live migrations includes:
>> +		ERROR, RUNNING, STOP, STOP_COPY, RESUMING.
> 
> .
>