Eighth-round integrations of the driver-manager migration's D-phase.
This round closes the remaining gaps from the v1.9 assessment: the
/modalias write path is now wired, the smart scheduler decides
serial-vs-concurrent based on device count, exclusive_with mutual
exclusion works for the CachyOS amdgpu/radeon pattern, pci=nomsi
env var matches Linux's kernel parameter, and pciehp hotplug events
are read from /scheme/pci/pciehp.
scheme.rs:
- Added /modalias write path. Write MODALIAS string, get back the
matching driver name (via modalias::lookup_modalias). The endpoint
is now a real read/write interface, not a static hint.
modalias.rs:
- Added lookup_modalias(modalias) that iterates over registered
drivers (via drivers_registered()) and computes match_modalias for
each. Returns the driver's name if a match is found.
config.rs:
- Added REGISTERED_DRIVERS static (OnceLock<Vec<DriverConfig>>) and
set_registered_drivers() so lookup_modalias has real data.
- Added exclusive_with: Vec<String> to DriverConfig + RawDriverEntry +
RawLegacyEntry + convert_legacy. When two drivers in different
[[driver]] blocks could match the same PCI ID, the first one (per
priority) wins and the other is deferred (CachyOS amdgpu/radeon
mutual-exclusion pattern).
- Added pci=nomsi env var handling: if pci=nomsi or pci=no_msi is set,
the spawned child gets REDBEAR_DRIVER_PCI_IRQ_MODE=intx_only so
it cannot use MSI or MSI-X. Matches Linux's pci=nomsi kernel parameter.
main.rs:
- Declared pciehp module. Spawned the pciehp listener thread alongside
AER (both poll every 500ms, falling back to log-and-no-op when the
files don't exist).
pciehp.rs (NEW):
- PciehpEvent + PciehpEventKind enum (PresenceDetectChanged,
AttentionButton, MrlSensorChanged, DataLinkStateChanged, Unknown)
- spawn_pciehp_listener polls /scheme/pci/pciehp every 500ms and
routes events to bound drivers via the existing hotplug fallback
- 6 unit tests cover parse_pdc_event, parse_attention_button,
parse_mrl_sensor, parse_dll_state, parse_rejects_missing_device, and
event_kind_label_round_trips
reaper.rs:
- Fixed the reap_flag_round_trip test to clean up after itself (was
failing because the shared REAP_FLAG was left set by the previous
test)
manager.rs:
- Smart scheduler: DeviceManager::enumerate now decides serial vs
concurrent based on device count. If remaining devices >= 4 AND
max_concurrent_probes > 1, use the concurrent worker pool
(ConcurrentDeviceManager::from_manager). Otherwise, use serial.
The manager's state is synced back from the concurrent path after
enumeration.
concurrent.rs:
- Added deferred_queue_snapshot() method so the manager can sync
state back from the concurrent path.
Test totals: 46 tests across 4 crates, all passing.
§ 0.5 audit gate: 0 violations across 38 files.
vasilito
fb2922e4fd