Linux kernel has multiple subsystems that expose operations via sysfs or provide mechanisms for userspace to interact with the driver. For this reason, kw offers some options that target some specific subsystems for providing facilities for users to interact with a particular subsystem. Currently, we only support drm.
This feature is responsible to deal with DRM features.
- --local, --remote [<remote>:<port>]:
This option specifies the target device for the drm action, it can be a remote or local machine. If these options are not explicitly passed via command line, kw going to take the target set in the variable default_deploy_target (kworkflow.config) for identifying the target. It is important to highlight that the drm feature does not support VM.
- -lm, --load-module=<module>[:<param1>,…][;<module>:…]:
Allow user to specify one or more modules to be load with or without parameters. If you want to indicate more than one module, you have to separate them using ‘;’. Additionally, if users wish to provide specific parameters for the target module, they have to use ‘:’ and separate each parameter with ‘,’. This option can be combined with
--gui-on, kw will make sure that the target module will be load first and after that trigger the GUI.
- -um=<module>[;<module>;…], --unload-module=<module>[;<module>;…]:
This option allows users to unload one or more DRM drivers. Users can provide a single module to be unloaded or a list separated by ‘;’. This command first disables the user interface and, after that, unloads the module.
This option provides a mechanism for turn-on the GUI, by default it uses systemctl operation; however, users are free to add any specific command for activating their preferred GUI in the variable gui_on on the kworkflow.config file.
Turn off the target GUI in the specified target, by default, it uses the systemctl operation but users can change this behavior by set gui_off with a specific command in the kworkflow.config file with the specific command.
Show all connectors available in the target machine.
Show all available modes per card.
Verbose mode is an option that causes the kw program to display debug messages to track its progress. This functionality is very useful during the debugging process, allowing you to identify possible errors more easily.
For these examples, we suppose the fields in your kworkflow.config file are already configured.
If you are working with DRM drivers, you can take advantage of load and unload commands combined with GUI control commands. For example:
kw drm --load-module='amdgpu' --gui-on # Load a driver and trigger the user GUI kw drm --unload-module='amdgpu' # Turn off user GUI and unload the driver
You have to wait for the sshd to become ready.