linux-kernel - [PATCH v10 4/5] Documentation: add debugfs description for vfio

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Message-ID: <20230408074224.62608-5-liulongfang@huawei.com>
Date:   Sat, 8 Apr 2023 15:42:23 +0800
From:   Longfang Liu <liulongfang@...wei.com>
To:     <alex.williamson@...hat.com>, <jgg@...dia.com>,
        <shameerali.kolothum.thodi@...wei.com>,
        <jonathan.cameron@...wei.com>
CC:     <cohuck@...hat.com>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...neuler.org>, <liulongfang@...wei.com>
Subject: [PATCH v10 4/5] Documentation: add debugfs description for vfio

1.Add two 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@...wei.com>
---
 .../ABI/testing/debugfs-hisi-migration        | 39 +++++++++++++++++++
 Documentation/ABI/testing/debugfs-vfio        | 25 ++++++++++++
 MAINTAINERS                                   |  2 +
 3 files changed, 66 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..e67478685ed0
--- /dev/null
+++ b/Documentation/ABI/testing/debugfs-hisi-migration
@@ -0,0 +1,39 @@
+What:		/sys/kernel/debug/vfio/<device>/migration/hisi_acc/data
+Date:		April 2023
+KernelVersion:  6.2
+Contact:	Longfang Liu <liulongfang@...wei.com>
+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/<device>/migration/hisi_acc/attr
+Date:		April 2023
+KernelVersion:  6.2
+Contact:	Longfang Liu <liulongfang@...wei.com>
+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/<device>/migration/hisi_acc/io_test
+Date:		April 2023
+KernelVersion:  6.2
+Contact:	Longfang Liu <liulongfang@...wei.com>
+Description:	Trigger the HiSilicon accelerator device to perform
+		the io test through the read operation, and directly output
+		the test result.
+
+What:		/sys/kernel/debug/vfio/<device>/migration/hisi_acc/save
+Date:		April 2023
+KernelVersion:  6.2
+Contact:	Longfang Liu <liulongfang@...wei.com>
+Description:	Trigger the Hisilicon accelerator device to perform
+		the state saving operation of live migration through the read
+		operation, and directly output the operation result.
+
+What:		/sys/kernel/debug/vfio/<device>/migration/hisi_acc/restore
+Date:		April 2023
+KernelVersion:  6.2
+Contact:	Longfang Liu <liulongfang@...wei.com>
+Description:	Trigger the Hisilicon accelerator device to perform
+		the state restoration operation of live migration through
+		the read operation, and directly output the operation result.
\ No newline at end of file
diff --git a/Documentation/ABI/testing/debugfs-vfio b/Documentation/ABI/testing/debugfs-vfio
new file mode 100644
index 000000000000..85d2b676cb87
--- /dev/null
+++ b/Documentation/ABI/testing/debugfs-vfio
@@ -0,0 +1,25 @@
+What:		/sys/kernel/debug/vfio
+Date:		April 2023
+KernelVersion:  6.2
+Contact:	Longfang Liu <liulongfang@...wei.com>
+Description:	This debugfs file directory is used for debugging
+		of vfio devices.
+		Each device can create a device subdirectory under this
+		directory by referencing the public registration interface.
+
+What:		/sys/kernel/debug/vfio/<device>/migration
+Date:		April 2023
+KernelVersion:  6.2
+Contact:	Longfang Liu <liulongfang@...wei.com>
+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:		April 2023
+KernelVersion:  6.2
+Contact:	Longfang Liu <liulongfang@...wei.com>
+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 61d3d019cfc7..147c597c9239 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -21860,6 +21860,7 @@ L:	kvm@...r.kernel.org
 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
@@ -21877,6 +21878,7 @@ M:	Longfang Liu <liulongfang@...wei.com>
 M:	Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
 L:	kvm@...r.kernel.org
 S:	Maintained
+F:	Documentation/ABI/testing/debugfs-hisi-migration
 F:	drivers/vfio/pci/hisilicon/
 
 VFIO MEDIATED DEVICE DRIVERS
-- 
2.24.0