[PATCH v8 4/5] Documentation: add debugfs description for vfio

[Longfang Liu]

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@xxxxxxxxxx>
---
 .../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
+Date:		Feb 2023
+KernelVersion:  6.2
+Contact:	linux-kernel@xxxxxxxxxxxxxxx
+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@xxxxxxxxxxxxxxx
+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@xxxxxxxxxxxxxxx
+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@xxxxxxxxxxxxxxx
+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@xxxxxxxxxxxxxxx
+Description:	Read the live migration status of the vfio device.
+		The status of these live migrations includes:
+		ERROR, RUNNING, STOP, STOP_COPY, RESUMING.
-- 
2.24.0