When Address Translation with ATS is enabled, for CHI and CCIX, the set of available control and statistics features is expanded to configure, control and gather statistics.
ATS control is needed to configure, control and report status to the PCIe root complex (host TA), to simplify system configuration and bring up; normally all PCIe endpoint configuration, enumeration and operational control are handled by firmware.
Features available for control are:
- ATS propagation on/off
- PRI propagation on/off
- PRI Retry capability on/off
- PRI Retry threshold level, if PRI Retry capability on
- TAG range support
- Memory attributes on/off (propagated from Host TA override defaults)
- PASID on/off (when enabled - both CCIX and CHI)
- Page attributes Privilege Enable/ Execute Enable on/off (with Host TA PASID propagation enabled)
- Global Invalidate Enabled on/off (with Host TA PASID propagation enabled)