diff options
| author | Saravana Kannan <saravanak@google.com> | 2020-05-21 22:18:00 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-07-10 16:24:56 +0300 |
| commit | da6d647598a6d182eb6a0344a7b14ae005244399 (patch) | |
| tree | 88dcad2df2466fa911d88dcad5669b7c72d5b016 /Documentation/ABI | |
| parent | 8fd456ec0cf03875908d6b67c1cd20cf0a7b4474 (diff) | |
| download | linux-da6d647598a6d182eb6a0344a7b14ae005244399.tar.xz | |
driver core: Add waiting_for_supplier sysfs file for devices
This would be useful to check if a device is not probing because it's
waiting for a supplier to be added and then linked to before it can
probe.
To reduce sysfs clutter, this file is added only if it can ever be 1.
So, if fw_devlink is disabled or set to permissive, this file is not
added. Also, this file is removed once the device probes as it's no
longer relevant.
Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20200521191800.136035-4-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-devices-waiting_for_supplier | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-waiting_for_supplier b/Documentation/ABI/testing/sysfs-devices-waiting_for_supplier new file mode 100644 index 000000000000..59d073d20db6 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-devices-waiting_for_supplier @@ -0,0 +1,17 @@ +What: /sys/devices/.../waiting_for_supplier +Date: May 2020 +Contact: Saravana Kannan <saravanak@google.com> +Description: + The /sys/devices/.../waiting_for_supplier attribute is only + present when fw_devlink kernel command line option is enabled + and is set to something stricter than "permissive". It is + removed once a device probes successfully (because the + information is no longer relevant). The number read from it (0 + or 1) reflects whether the device is waiting for one or more + suppliers to be added and then linked to using device links + before the device can probe. + + A value of 0 means the device is not waiting for any suppliers + to be added before it can probe. A value of 1 means the device + is waiting for one or more suppliers to be added before it can + probe. |