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kernel / Documentation / ABI / stable / sysfs-driver-qaic
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1What: /sys/bus/pci/drivers/qaic/XXXX:XX:XX.X/accel/accel<minor_nr>/dbc<N>_state 2Date: October 2025 3KernelVersion: 6.19 4Contact: Jeff Hugo <jeff.hugo@oss.qualcomm.com> 5Description: Represents the current state of DMA Bridge channel (DBC). Below are the possible 6 states: 7 8 =================== ========================================================== 9 IDLE (0) DBC is free and can be activated 10 ASSIGNED (1) DBC is activated and a workload is running on device 11 BEFORE_SHUTDOWN (2) Sub-system associated with this workload has crashed and 12 it will shutdown soon 13 AFTER_SHUTDOWN (3) Sub-system associated with this workload has crashed and 14 it has shutdown 15 BEFORE_POWER_UP (4) Sub-system associated with this workload is shutdown and 16 it will be powered up soon 17 AFTER_POWER_UP (5) Sub-system associated with this workload is now powered up 18 =================== ========================================================== 19Users: Any userspace application or clients interested in DBC state.