How does chwd_port match PCI and USB IDs against hardware driver profiles?

[amandeavor]

Can someone explain the matching algorithm used in chwd_port when scanning /sys/bus/pci/devices and how priority resolution works for proprietary vs open-source kernel drivers?

[amandeavor]

Overview of chwd_port Driver Matching Algorithm

chwd_port scans /sys/bus/pci/devices and parses vendor, device, class, and subsystem_device hex identifiers. Here is how resolution works:

1. Hardware Discovery: Scans udev and sysfs descriptors into an in-memory PciDevice struct array.
2. Declarative Profile Evaluation: Compares discovered IDs against declarative YAML/JSON profiles located in /usr/share/chwd/profiles/.
3. Priority & Driver Selection:
   • Open-source (Mesa/nouveau/amdgpu): Base default profile priority score = 50.
   • Proprietary (nvidia-dkms): Enhanced priority score = 100 when proprietary mode is selected.
4. Service & Package Provisioning: Once the highest priority profile matches, chwd_port invokes xbps-install for packages and activates associated runit services.