31:4

0h

RO

Reserved

3:2

0h

RO/V

Reset Type Required (RTR)

00: Software can issue a Reset Device command to the Command Register (see #341204 section 9.2.12) to recover the device.
01: Device requires a function-level reset (FLR) to recover from the current state.
10: Device requires a warm-reset to recover from the current state.
11: Device requires a cold-reset to recover. This is typically after a severe error that cannot be cleared with a function-reset (FLR) or warm reset.
Note: This field indicates the minimum reset type needed to recover. Software can always choose to invoke a stronger type of reset to reinitialize the device. The mechanism used to trigger a reset may be platform-specific. It should be noted that when using Function Level Reset, software is expected to follow the app note in the PCIe specification, #341204 section 6.6.2.

1:0

0h

RO/V

Device State (DEVST)

00: Device is Disabled. No work is performed. All ENQ operations return Retry.
01: Device is Enabled. Work queues may be enabled, and descriptors may be submitted to enabled work queues.
10: Disable Device or Reset Device command is in progress. Descriptors are not accepted into any WQ. All Descriptors are being drained.
11: Halt State. The device is halted due to an error or unsupported condition that was encountered. Additional details related to this state and related software actions needed are described in #341204 section 5.6.