New Intel VSEC features will have dependencies on other features, requiring
certain supplier drivers to be probed before their consumers. To enforce
this dependency ordering, introduce device links using device_link_add(),
ensuring that suppliers are fully registered before consumers are probed.
- Add device link tracking by storing supplier devices and tracking their
state.
- Implement intel_vsec_link_devices() to establish links between suppliers
and consumers based on feature dependencies.
- Add get_consumer_dependencies() to retrieve supplier-consumer
relationships.
- Modify feature registration logic:
* Consumers now check that all required suppliers are registered before
being initialized.
* suppliers_ready() verifies that all required supplier devices are
available.
- Prevent potential null consumer name issue in sysfs:
- Use dev_set_name() when creating auxiliary devices to ensure a
unique, non-null consumer name.
- Update intel_vsec_pci_probe() to loop up to the number of possible
features or when all devices are registered, whichever comes first.
- Introduce VSEC_CAP_UNUSED to prevent sub-features (registered via
exported APIs) from being mistakenly linked.
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Link: https://lore.kernel.org/r/20250703022832.1302928-5-david.e.box@linux.intel.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
