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>
Reviewed-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Link: https://lore.kernel.org/r/20241112073322.54550-5-liulongfang@huawei.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

diff --git a/Documentation/ABI/testing/debugfs-hisi-migration b/Documentation/ABI/testing/debugfs-hisi-migration
new file mode 100644 (file)
index 0000000..2c01b2d
--- /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:          Jan 2025
+KernelVersion:  6.13
+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:          Jan 2025
+KernelVersion:  6.13
+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".
+               The migf_data is the dev_data that is migrated.
+
+What:          /sys/kernel/debug/vfio/<device>/migration/hisi_acc/cmd_state
+Date:          Jan 2025
+KernelVersion:  6.13
+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.