Path: blob/master/Documentation/ABI/stable/sysfs-driver-qaic
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What: /sys/bus/pci/drivers/qaic/XXXX:XX:XX.X/accel/accel<minor_nr>/dbc<N>_state Date: October 2025 KernelVersion: 6.19 Contact: Jeff Hugo <[email protected]> Description: Represents the current state of DMA Bridge channel (DBC). Below are the possible states: =================== ========================================================== IDLE (0) DBC is free and can be activated ASSIGNED (1) DBC is activated and a workload is running on device BEFORE_SHUTDOWN (2) Sub-system associated with this workload has crashed and it will shutdown soon AFTER_SHUTDOWN (3) Sub-system associated with this workload has crashed and it has shutdown BEFORE_POWER_UP (4) Sub-system associated with this workload is shutdown and it will be powered up soon AFTER_POWER_UP (5) Sub-system associated with this workload is now powered up =================== ========================================================== Users: Any userspace application or clients interested in DBC state.