linux-kernel - RE: [PATCH v7 4/4] Documentation: add debugfs description for hisi migration

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Message-ID: <6b13310df6df42faba08eb7335c4b33b@huawei.com>
Date: Mon, 5 Aug 2024 09:09:37 +0000
From: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
To: liulongfang <liulongfang@...wei.com>, "alex.williamson@...hat.com"
	<alex.williamson@...hat.com>, "jgg@...dia.com" <jgg@...dia.com>, "Jonathan
 Cameron" <jonathan.cameron@...wei.com>
CC: "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linuxarm@...neuler.org" <linuxarm@...neuler.org>
Subject: RE: [PATCH v7 4/4] Documentation: add debugfs description for hisi
 migration



> -----Original Message-----
> From: liulongfang <liulongfang@...wei.com>
> Sent: Tuesday, July 30, 2024 1:15 PM
> To: alex.williamson@...hat.com; jgg@...dia.com; Shameerali Kolothum
> Thodi <shameerali.kolothum.thodi@...wei.com>; Jonathan Cameron
> <jonathan.cameron@...wei.com>
> Cc: kvm@...r.kernel.org; linux-kernel@...r.kernel.org;
> linuxarm@...neuler.org; liulongfang <liulongfang@...wei.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@...wei.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@...wei.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@...wei.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?

Thanks,
Shameer

> +
> +What:
> 	/sys/kernel/debug/vfio/<device>/migration/hisi_acc/cmd_state
> +Date:		Jul 2024
> +KernelVersion:  6.11
> +Contact:	Longfang Liu <liulongfang@...wei.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