131 lines
4.4 KiB
Plaintext
131 lines
4.4 KiB
Plaintext
What: /sys/class/devlink/.../
|
|
Date: May 2020
|
|
Contact: Saravana Kannan <saravanak@google.com>
|
|
Description:
|
|
Provide a place in sysfs for the device link objects in the
|
|
kernel at any given time. The name of a device link directory,
|
|
denoted as ... above, is of the form <supplier>--<consumer>
|
|
where <supplier> is the supplier bus:device name and <consumer>
|
|
is the consumer bus:device name.
|
|
|
|
What: /sys/class/devlink/.../auto_remove_on
|
|
Date: May 2020
|
|
Contact: Saravana Kannan <saravanak@google.com>
|
|
Description:
|
|
This file indicates if the device link will ever be
|
|
automatically removed by the driver core when the consumer and
|
|
supplier devices themselves are still present.
|
|
|
|
This will be one of the following strings:
|
|
|
|
- 'consumer unbind'
|
|
- 'supplier unbind'
|
|
- 'never'
|
|
|
|
'consumer unbind' means the device link will be removed when
|
|
the consumer's driver is unbound from the consumer device.
|
|
|
|
'supplier unbind' means the device link will be removed when
|
|
the supplier's driver is unbound from the supplier device.
|
|
|
|
'never' means the device link will not be automatically removed
|
|
when as long as the supplier and consumer devices themselves
|
|
are still present.
|
|
|
|
What: /sys/class/devlink/.../consumer
|
|
Date: May 2020
|
|
Contact: Saravana Kannan <saravanak@google.com>
|
|
Description:
|
|
This file is a symlink to the consumer device's sysfs directory.
|
|
|
|
What: /sys/class/devlink/.../runtime_pm
|
|
Date: May 2020
|
|
Contact: Saravana Kannan <saravanak@google.com>
|
|
Description:
|
|
This file indicates if the device link has any impact on the
|
|
runtime power management behavior of the consumer and supplier
|
|
devices. For example: Making sure the supplier doesn't enter
|
|
runtime suspend while the consumer is active.
|
|
|
|
This will be one of the following strings:
|
|
|
|
=== ========================================
|
|
'0' Does not affect runtime power management
|
|
'1' Affects runtime power management
|
|
=== ========================================
|
|
|
|
What: /sys/class/devlink/.../status
|
|
Date: May 2020
|
|
Contact: Saravana Kannan <saravanak@google.com>
|
|
Description:
|
|
This file indicates the status of the device link. The status
|
|
of a device link is affected by whether the supplier and
|
|
consumer devices have been bound to their corresponding
|
|
drivers. The status of a device link also affects the binding
|
|
and unbinding of the supplier and consumer devices with their
|
|
drivers and also affects whether the software state of the
|
|
supplier device is synced with the hardware state of the
|
|
supplier device after boot up.
|
|
See also: sysfs-devices-state_synced.
|
|
|
|
This will be one of the following strings:
|
|
|
|
- 'not tracked'
|
|
- 'dormant'
|
|
- 'available'
|
|
- 'consumer probing'
|
|
- 'active'
|
|
- 'supplier unbinding'
|
|
- 'unknown'
|
|
|
|
'not tracked' means this device link does not track the status
|
|
and has no impact on the binding, unbinding and syncing the
|
|
hardware and software device state.
|
|
|
|
'dormant' means the supplier and the consumer devices have not
|
|
bound to their driver.
|
|
|
|
'available' means the supplier has bound to its driver and is
|
|
available to supply resources to the consumer device.
|
|
|
|
'consumer probing' means the consumer device is currently
|
|
trying to bind to its driver.
|
|
|
|
'active' means the supplier and consumer devices have both
|
|
bound successfully to their drivers.
|
|
|
|
'supplier unbinding' means the supplier devices is currently in
|
|
the process of unbinding from its driver.
|
|
|
|
'unknown' means the state of the device link is not any of the
|
|
above. If this is ever the value, there's a bug in the kernel.
|
|
|
|
What: /sys/class/devlink/.../supplier
|
|
Date: May 2020
|
|
Contact: Saravana Kannan <saravanak@google.com>
|
|
Description:
|
|
This file is a symlink to the supplier device's sysfs directory.
|
|
|
|
What: /sys/class/devlink/.../sync_state_only
|
|
Date: May 2020
|
|
Contact: Saravana Kannan <saravanak@google.com>
|
|
Description:
|
|
This file indicates if the device link is limited to only
|
|
affecting the syncing of the hardware and software state of the
|
|
supplier device.
|
|
|
|
This will be one of the following strings:
|
|
|
|
=== ================================
|
|
'0'
|
|
'1' Affects runtime power management
|
|
=== ================================
|
|
|
|
'0' means the device link can affect other device behaviors
|
|
like binding/unbinding, suspend/resume, runtime power
|
|
management, etc.
|
|
|
|
'1' means the device link will only affect the syncing of
|
|
hardware and software state of the supplier device after boot
|
|
up and doesn't not affect other behaviors of the devices.
|