PCI: Allow userspace to query and set device reset mechanism

[sfrench/cifs-2.6.git] / Documentation / ABI / testing / sysfs-bus-pci

diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci
index 793cbb76cd2505d4365fddff9f485c609fc4a16d..d4ae03296861e4710e7befe7527937c5e165050b 100644 (file)
--- a/Documentation/ABI/testing/sysfs-bus-pci
+++ b/Documentation/ABI/testing/sysfs-bus-pci
@@ -121,6 +121,23 @@ Description:
                child buses, and re-discover devices removed earlier
                from this part of the device tree.
 
+What:          /sys/bus/pci/devices/.../reset_method
+Date:          August 2021
+Contact:       Amey Narkhede <ameynarkhede03@gmail.com>
+Description:
+               Some devices allow an individual function to be reset
+               without affecting other functions in the same slot.
+
+               For devices that have this support, a file named
+               reset_method is present in sysfs.  Reading this file
+               gives names of the supported and enabled reset methods and
+               their ordering.  Writing a space-separated list of names of
+               reset methods sets the reset methods and ordering to be
+               used when resetting the device.  Writing an empty string
+               disables the ability to reset the device.  Writing
+               "default" enables all supported reset methods in the
+               default ordering.
+
 What:          /sys/bus/pci/devices/.../reset
 Date:          July 2009
 Contact:       Michael S. Tsirkin <mst@redhat.com>