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1What: /sys/class/devlink/.../2Date: May 20203Contact: Saravana Kannan <saravanak@google.com>4Description:5 Provide a place in sysfs for the device link objects in the6 kernel at any given time. The name of a device link directory,7 denoted as ... above, is of the form <supplier>--<consumer>8 where <supplier> is the supplier bus:device name and <consumer>9 is the consumer bus:device name.10 11What: /sys/class/devlink/.../auto_remove_on12Date: May 202013Contact: Saravana Kannan <saravanak@google.com>14Description:15 This file indicates if the device link will ever be16 automatically removed by the driver core when the consumer and17 supplier devices themselves are still present.18 19 This will be one of the following strings:20 21 - 'consumer unbind'22 - 'supplier unbind'23 - 'never'24 25 'consumer unbind' means the device link will be removed when26 the consumer's driver is unbound from the consumer device.27 28 'supplier unbind' means the device link will be removed when29 the supplier's driver is unbound from the supplier device.30 31 'never' means the device link will not be automatically removed32 when as long as the supplier and consumer devices themselves33 are still present.34 35What: /sys/class/devlink/.../consumer36Date: May 202037Contact: Saravana Kannan <saravanak@google.com>38Description:39 This file is a symlink to the consumer device's sysfs directory.40 41What: /sys/class/devlink/.../runtime_pm42Date: May 202043Contact: Saravana Kannan <saravanak@google.com>44Description:45 This file indicates if the device link has any impact on the46 runtime power management behavior of the consumer and supplier47 devices. For example: Making sure the supplier doesn't enter48 runtime suspend while the consumer is active.49 50 This will be one of the following strings:51 52 === ========================================53 '0' Does not affect runtime power management54 '1' Affects runtime power management55 === ========================================56 57What: /sys/class/devlink/.../status58Date: May 202059Contact: Saravana Kannan <saravanak@google.com>60Description:61 This file indicates the status of the device link. The status62 of a device link is affected by whether the supplier and63 consumer devices have been bound to their corresponding64 drivers. The status of a device link also affects the binding65 and unbinding of the supplier and consumer devices with their66 drivers and also affects whether the software state of the67 supplier device is synced with the hardware state of the68 supplier device after boot up.69 See also: sysfs-devices-state_synced.70 71 This will be one of the following strings:72 73 - 'not tracked'74 - 'dormant'75 - 'available'76 - 'consumer probing'77 - 'active'78 - 'supplier unbinding'79 - 'unknown'80 81 'not tracked' means this device link does not track the status82 and has no impact on the binding, unbinding and syncing the83 hardware and software device state.84 85 'dormant' means the supplier and the consumer devices have not86 bound to their driver.87 88 'available' means the supplier has bound to its driver and is89 available to supply resources to the consumer device.90 91 'consumer probing' means the consumer device is currently92 trying to bind to its driver.93 94 'active' means the supplier and consumer devices have both95 bound successfully to their drivers.96 97 'supplier unbinding' means the supplier devices is currently in98 the process of unbinding from its driver.99 100 'unknown' means the state of the device link is not any of the101 above. If this is ever the value, there's a bug in the kernel.102 103What: /sys/class/devlink/.../supplier104Date: May 2020105Contact: Saravana Kannan <saravanak@google.com>106Description:107 This file is a symlink to the supplier device's sysfs directory.108 109What: /sys/class/devlink/.../sync_state_only110Date: May 2020111Contact: Saravana Kannan <saravanak@google.com>112Description:113 This file indicates if the device link is limited to only114 affecting the syncing of the hardware and software state of the115 supplier device.116 117 This will be one of the following strings:118 119 === ================================120 '0'121 '1' Affects runtime power management122 === ================================123 124 '0' means the device link can affect other device behaviors125 like binding/unbinding, suspend/resume, runtime power126 management, etc.127 128 '1' means the device link will only affect the syncing of129 hardware and software state of the supplier device after boot130 up and doesn't not affect other behaviors of the devices.131