[PATCH v15 2/2] Documentation: add debugfs description for vfio

[liulongfang]

From: Longfang Liu <liulongfang@xxxxxxxxxx>

1.Add an debugfs document description file to help users understand
how to use the accelerator live migration driver's debugfs.
2.Update the file paths that need to be maintained in MAINTAINERS

Signed-off-by: Longfang Liu <liulongfang@xxxxxxxxxx>
---
 Documentation/ABI/testing/debugfs-vfio | 25 +++++++++++++++++++++++++
 MAINTAINERS                            |  1 +
 2 files changed, 26 insertions(+)
 create mode 100644 Documentation/ABI/testing/debugfs-vfio

diff --git a/Documentation/ABI/testing/debugfs-vfio b/Documentation/ABI/testing/debugfs-vfio
new file mode 100644
index 000000000000..086a8c52df35
--- /dev/null
+++ b/Documentation/ABI/testing/debugfs-vfio
@@ -0,0 +1,25 @@
+What:		/sys/kernel/debug/vfio
+Date:		Aug 2023
+KernelVersion:  6.6
+Contact:	Longfang Liu <liulongfang@xxxxxxxxxx>
+Description:	This debugfs file directory is used for debugging
+		of vfio devices, it's a common directory for all vfio devices.
+		Each device should create a device subdirectory under this
+		directory by referencing the public registration interface.
+
+What:		/sys/kernel/debug/vfio/<device>/migration
+Date:		Aug 2023
+KernelVersion:  6.6
+Contact:	Longfang Liu <liulongfang@xxxxxxxxxx>
+Description:	This debugfs file directory is used for debugging
+		of vfio devices that support live migration.
+		The debugfs of each vfio device that supports live migration
+		could be created under this directory.
+
+What:		/sys/kernel/debug/vfio/<device>/migration/state
+Date:		Aug 2023
+KernelVersion:  6.6
+Contact:	Longfang Liu <liulongfang@xxxxxxxxxx>
+Description:	Read the live migration status of the vfio device.
+		The status of these live migrations includes:
+		ERROR, RUNNING, STOP, STOP_COPY, RESUMING.
diff --git a/MAINTAINERS b/MAINTAINERS
index 7b1306615fc0..bd01ca674c60 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -22304,6 +22304,7 @@ L:	kvm@xxxxxxxxxxxxxxx
 S:	Maintained
 T:	git https://github.com/awilliam/linux-vfio.git
 F:	Documentation/ABI/testing/sysfs-devices-vfio-dev
+F:	Documentation/ABI/testing/debugfs-vfio
 F:	Documentation/driver-api/vfio.rst
 F:	drivers/vfio/
 F:	include/linux/vfio.h
-- 
2.24.0