Re: [PATCH v7 4/4] Documentation: add debugfs description for hisi migration

[liulongfang <liulongfang@huawei.com>]

On 2024/8/5 17:09, Shameerali Kolothum Thodi wrote:
> 
> 
>> -----Original Message-----
>> From: liulongfang <liulongfang@huawei.com>
>> Sent: Tuesday, July 30, 2024 1:15 PM
>> To: alex.williamson@redhat.com; jgg@nvidia.com; Shameerali Kolothum
>> Thodi <shameerali.kolothum.thodi@huawei.com>; Jonathan Cameron
>> <jonathan.cameron@huawei.com>
>> Cc: kvm@vger.kernel.org; linux-kernel@vger.kernel.org;
>> linuxarm@openeuler.org; liulongfang <liulongfang@huawei.com>
>> Subject: [PATCH v7 4/4] Documentation: add debugfs description for hisi
>> migration
>>
>> Add a debugfs document description file to help users understand
>> how to use the hisilicon accelerator live migration driver's
>> debugfs.
>>
>> Update the file paths that need to be maintained in MAINTAINERS
>>
>> Signed-off-by: Longfang Liu <liulongfang@huawei.com>
>> ---
>>  .../ABI/testing/debugfs-hisi-migration        | 25 +++++++++++++++++++
>>  1 file changed, 25 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..053f3ebba9b1
>> --- /dev/null
>> +++ b/Documentation/ABI/testing/debugfs-hisi-migration
>> @@ -0,0 +1,25 @@
>> +What:
>> 	/sys/kernel/debug/vfio/<device>/migration/hisi_acc/dev_data
>> +Date:		Jul 2024
>> +KernelVersion:  6.11
>> +Contact:	Longfang Liu <liulongfang@huawei.com>
>> +Description:	Read the configuration data and some status data
>> +		required for device live migration. These data include device
>> +		status data, queue configuration data, some task
>> configuration
>> +		data and device attribute data. The output format of the data
>> +		is defined by the live migration driver.
>> +
>> +What:
>> 	/sys/kernel/debug/vfio/<device>/migration/hisi_acc/migf_data
>> +Date:		Jul 2024
>> +KernelVersion:  6.11
>> +Contact:	Longfang Liu <liulongfang@huawei.com>
>> +Description:	Read the data from the last completed live migration.
>> +		This data includes the same device status data as in
>> "dev_data".
>> +		And some device status data after the migration is
>> completed.
> 
> Actually what info is different from dev_data here? Only that it is the
> dev_data after a migration is attempted/completed, right?
>

Yes, the only difference is: The mig_data is the dev_data that is migrated.

Thanks.
Longfang.

> Thanks,
> Shameer
> 
>> +
>> +What:
>> 	/sys/kernel/debug/vfio/<device>/migration/hisi_acc/cmd_state
>> +Date:		Jul 2024
>> +KernelVersion:  6.11
>> +Contact:	Longfang Liu <liulongfang@huawei.com>
>> +Description:	Used to obtain the device command sending and receiving
>> +		channel status. Returns failure or success logs based on the
>> +		results.
>> --
>> 2.24.0
> 
> .
>