| What: /sys/bus/thunderbolt/devices/.../domainX/boot_acl |
| Date: Jun 2018 |
| KernelVersion: 4.17 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: Holds a comma separated list of device unique_ids that |
| are allowed to be connected automatically during system |
| startup (e.g boot devices). The list always contains |
| maximum supported number of unique_ids where unused |
| entries are empty. This allows the userspace software |
| to determine how many entries the controller supports. |
| If there are multiple controllers, each controller has |
| its own ACL list and size may be different between the |
| controllers. |
| |
| System BIOS may have an option "Preboot ACL" or similar |
| that needs to be selected before this list is taken into |
| consideration. |
| |
| Software always updates a full list in each write. |
| |
| If a device is authorized automatically during boot its |
| boot attribute is set to 1. |
| |
| What: /sys/bus/thunderbolt/devices/.../domainX/deauthorization |
| Date: May 2021 |
| KernelVersion: 5.12 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: This attribute tells whether the system supports |
| de-authorization of devices. Value of 1 means user can |
| de-authorize PCIe tunnel by writing 0 to authorized |
| attribute under each device. |
| |
| What: /sys/bus/thunderbolt/devices/.../domainX/iommu_dma_protection |
| Date: Mar 2019 |
| KernelVersion: 4.21 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: This attribute tells whether the system uses IOMMU |
| for DMA protection. Value of 1 means IOMMU is used 0 means |
| it is not (DMA protection is solely based on Thunderbolt |
| security levels). |
| |
| What: /sys/bus/thunderbolt/devices/.../domainX/security |
| Date: Sep 2017 |
| KernelVersion: 4.13 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: This attribute holds current Thunderbolt security level |
| set by the system BIOS. Possible values are: |
| |
| ======= ================================================== |
| none All devices are automatically authorized |
| user Devices are only authorized based on writing |
| appropriate value to the authorized attribute |
| secure Require devices that support secure connect at |
| minimum. User needs to authorize each device. |
| dponly Automatically tunnel Display port (and USB). No |
| PCIe tunnels are created. |
| usbonly Automatically tunnel USB controller of the |
| connected Thunderbolt dock (and Display Port). All |
| PCIe links downstream of the dock are removed. |
| nopcie USB4 system where PCIe tunneling is disabled from |
| the BIOS. |
| ======= ================================================== |
| |
| What: /sys/bus/thunderbolt/devices/.../authorized |
| Date: Sep 2017 |
| KernelVersion: 4.13 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: This attribute is used to authorize Thunderbolt devices |
| after they have been connected. If the device is not |
| authorized, no PCIe devices are available to the system. |
| |
| Contents of this attribute will be 0 when the device is not |
| yet authorized. |
| |
| Possible values are supported: |
| |
| == =================================================== |
| 0 The device will be de-authorized (only supported if |
| deauthorization attribute under domain contains 1) |
| 1 The device will be authorized and connected |
| == =================================================== |
| |
| When key attribute contains 32 byte hex string the possible |
| values are: |
| |
| == ======================================================== |
| 0 The device will be de-authorized (only supported if |
| deauthorization attribute under domain contains 1) |
| 1 The 32 byte hex string is added to the device NVM and |
| the device is authorized. |
| 2 Send a challenge based on the 32 byte hex string. If the |
| challenge response from device is valid, the device is |
| authorized. In case of failure errno will be ENOKEY if |
| the device did not contain a key at all, and |
| EKEYREJECTED if the challenge response did not match. |
| == ======================================================== |
| |
| What: /sys/bus/thunderbolt/devices/.../boot |
| Date: Jun 2018 |
| KernelVersion: 4.17 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: This attribute contains 1 if Thunderbolt device was already |
| authorized on boot and 0 otherwise. |
| |
| What: /sys/bus/thunderbolt/devices/.../generation |
| Date: Jan 2020 |
| KernelVersion: 5.5 |
| Contact: Christian Kellner <christian@kellner.me> |
| Description: This attribute contains the generation of the Thunderbolt |
| controller associated with the device. It will contain 4 |
| for USB4. |
| |
| What: /sys/bus/thunderbolt/devices/.../key |
| Date: Sep 2017 |
| KernelVersion: 4.13 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: When a devices supports Thunderbolt secure connect it will |
| have this attribute. Writing 32 byte hex string changes |
| authorization to use the secure connection method instead. |
| Writing an empty string clears the key and regular connection |
| method can be used again. |
| |
| What: /sys/bus/thunderbolt/devices/.../device |
| Date: Sep 2017 |
| KernelVersion: 4.13 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: This attribute contains id of this device extracted from |
| the device DROM. |
| |
| What: /sys/bus/thunderbolt/devices/.../device_name |
| Date: Sep 2017 |
| KernelVersion: 4.13 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: This attribute contains name of this device extracted from |
| the device DROM. |
| |
| What: /sys/bus/thunderbolt/devices/.../maxhopid |
| Date: Jul 2021 |
| KernelVersion: 5.13 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: Only set for XDomains. The maximum HopID the other host |
| supports as its input HopID. |
| |
| What: /sys/bus/thunderbolt/devices/.../rx_speed |
| Date: Jan 2020 |
| KernelVersion: 5.5 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: This attribute reports the device RX speed per lane. |
| All RX lanes run at the same speed. |
| |
| What: /sys/bus/thunderbolt/devices/.../rx_lanes |
| Date: Jan 2020 |
| KernelVersion: 5.5 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: This attribute reports number of RX lanes the device is |
| using simultaneously through its upstream port. |
| |
| What: /sys/bus/thunderbolt/devices/.../tx_speed |
| Date: Jan 2020 |
| KernelVersion: 5.5 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: This attribute reports the TX speed per lane. |
| All TX lanes run at the same speed. |
| |
| What: /sys/bus/thunderbolt/devices/.../tx_lanes |
| Date: Jan 2020 |
| KernelVersion: 5.5 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: This attribute reports number of TX lanes the device is |
| using simultaneously through its upstream port. |
| |
| What: /sys/bus/thunderbolt/devices/.../vendor |
| Date: Sep 2017 |
| KernelVersion: 4.13 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: This attribute contains vendor id of this device extracted |
| from the device DROM. |
| |
| What: /sys/bus/thunderbolt/devices/.../vendor_name |
| Date: Sep 2017 |
| KernelVersion: 4.13 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: This attribute contains vendor name of this device extracted |
| from the device DROM. |
| |
| What: /sys/bus/thunderbolt/devices/.../unique_id |
| Date: Sep 2017 |
| KernelVersion: 4.13 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: This attribute contains unique_id string of this device. |
| This is either read from hardware registers (UUID on |
| newer hardware) or based on UID from the device DROM. |
| Can be used to uniquely identify particular device. |
| |
| What: /sys/bus/thunderbolt/devices/.../nvm_version |
| Date: Sep 2017 |
| KernelVersion: 4.13 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: If the device has upgradeable firmware the version |
| number is available here. Format: %x.%x, major.minor. |
| If the device is in safe mode reading the file returns |
| -ENODATA instead as the NVM version is not available. |
| |
| What: /sys/bus/thunderbolt/devices/.../nvm_authenticate |
| Date: Sep 2017 |
| KernelVersion: 4.13 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: When new NVM image is written to the non-active NVM |
| area (through non_activeX NVMem device), the |
| authentication procedure is started by writing to |
| this file. |
| If everything goes well, the device is |
| restarted with the new NVM firmware. If the image |
| verification fails an error code is returned instead. |
| |
| This file will accept writing values "1", "2" or "3". |
| |
| - Writing "1" will flush the image to the storage |
| area and authenticate the image in one action. |
| - Writing "2" will run some basic validation on the image |
| and flush it to the storage area. |
| - Writing "3" will authenticate the image that is |
| currently written in the storage area. This is only |
| supported with USB4 devices and retimers. |
| |
| When read holds status of the last authentication |
| operation if an error occurred during the process. This |
| is directly the status value from the DMA configuration |
| based mailbox before the device is power cycled. Writing |
| 0 here clears the status. |
| |
| What: /sys/bus/thunderbolt/devices/.../nvm_authenticate_on_disconnect |
| Date: Oct 2020 |
| KernelVersion: v5.9 |
| Contact: Mario Limonciello <mario.limonciello@outlook.com> |
| Description: For supported devices, automatically authenticate the new Thunderbolt |
| image when the device is disconnected from the host system. |
| |
| This file will accept writing values "1" or "2" |
| |
| - Writing "1" will flush the image to the storage |
| area and prepare the device for authentication on disconnect. |
| - Writing "2" will run some basic validation on the image |
| and flush it to the storage area. |
| |
| What: /sys/bus/thunderbolt/devices/<xdomain>.<service>/key |
| Date: Jan 2018 |
| KernelVersion: 4.15 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: This contains name of the property directory the XDomain |
| service exposes. This entry describes the protocol in |
| question. Following directories are already reserved by |
| the Apple XDomain specification: |
| |
| ======== =============================================== |
| network IP/ethernet over Thunderbolt |
| targetdm Target disk mode protocol over Thunderbolt |
| extdisp External display mode protocol over Thunderbolt |
| ======== =============================================== |
| |
| What: /sys/bus/thunderbolt/devices/<xdomain>.<service>/modalias |
| Date: Jan 2018 |
| KernelVersion: 4.15 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: Stores the same MODALIAS value emitted by uevent for |
| the XDomain service. Format: tbtsvc:kSpNvNrN |
| |
| What: /sys/bus/thunderbolt/devices/<xdomain>.<service>/prtcid |
| Date: Jan 2018 |
| KernelVersion: 4.15 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: This contains XDomain protocol identifier the XDomain |
| service supports. |
| |
| What: /sys/bus/thunderbolt/devices/<xdomain>.<service>/prtcvers |
| Date: Jan 2018 |
| KernelVersion: 4.15 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: This contains XDomain protocol version the XDomain |
| service supports. |
| |
| What: /sys/bus/thunderbolt/devices/<xdomain>.<service>/prtcrevs |
| Date: Jan 2018 |
| KernelVersion: 4.15 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: This contains XDomain software version the XDomain |
| service supports. |
| |
| What: /sys/bus/thunderbolt/devices/<xdomain>.<service>/prtcstns |
| Date: Jan 2018 |
| KernelVersion: 4.15 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: This contains XDomain service specific settings as |
| bitmask. Format: %x |
| |
| What: /sys/bus/thunderbolt/devices/usb4_portX/connector |
| Date: April 2022 |
| Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> |
| Description: |
| Symlink to the USB Type-C connector. This link is only |
| created when USB Type-C Connector Class is enabled, |
| and only if the system firmware is capable of |
| describing the connection between a port and its |
| connector. |
| |
| What: /sys/bus/thunderbolt/devices/usb4_portX/link |
| Date: Sep 2021 |
| KernelVersion: v5.14 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: Returns the current link mode. Possible values are |
| "usb4", "tbt" and "none". |
| |
| What: /sys/bus/thunderbolt/devices/usb4_portX/offline |
| Date: Sep 2021 |
| KernelVersion: v5.14 |
| Contact: Rajmohan Mani <rajmohan.mani@intel.com> |
| Description: Writing 1 to this attribute puts the USB4 port into |
| offline mode. Only allowed when there is nothing |
| connected to the port (link attribute returns "none"). |
| Once the port is in offline mode it does not receive any |
| hotplug events. This is used to update NVM firmware of |
| on-board retimers. Writing 0 puts the port back to |
| online mode. |
| |
| This attribute is only visible if the platform supports |
| powering on retimers when there is no cable connected. |
| |
| What: /sys/bus/thunderbolt/devices/usb4_portX/rescan |
| Date: Sep 2021 |
| KernelVersion: v5.14 |
| Contact: Rajmohan Mani <rajmohan.mani@intel.com> |
| Description: When the USB4 port is in offline mode writing 1 to this |
| attribute forces rescan of the sideband for on-board |
| retimers. Each retimer appear under the USB4 port as if |
| the USB4 link was up. These retimers act in the same way |
| as if the cable was connected so upgrading their NVM |
| firmware can be done the usual way. |
| |
| What: /sys/bus/thunderbolt/devices/<device>:<port>.<index>/device |
| Date: Oct 2020 |
| KernelVersion: v5.9 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: Retimer device identifier read from the hardware. |
| |
| What: /sys/bus/thunderbolt/devices/<device>:<port>.<index>/nvm_authenticate |
| Date: Oct 2020 |
| KernelVersion: v5.9 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: When new NVM image is written to the non-active NVM |
| area (through non_activeX NVMem device), the |
| authentication procedure is started by writing 1 to |
| this file. If everything goes well, the device is |
| restarted with the new NVM firmware. If the image |
| verification fails an error code is returned instead. |
| |
| When read holds status of the last authentication |
| operation if an error occurred during the process. |
| Format: %x. |
| |
| What: /sys/bus/thunderbolt/devices/<device>:<port>.<index>/nvm_version |
| Date: Oct 2020 |
| KernelVersion: v5.9 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: Holds retimer NVM version number. Format: %x.%x, major.minor. |
| |
| What: /sys/bus/thunderbolt/devices/<device>:<port>.<index>/vendor |
| Date: Oct 2020 |
| KernelVersion: v5.9 |
| Contact: Mika Westerberg <mika.westerberg@linux.intel.com> |
| Description: Retimer vendor identifier read from the hardware. |
