Christophe Lombard [off-list ref] writes:

The POWER9 core supports a new feature: ASB_Notify which requires the
support of the Special Purpose Register: TIDR.

The ASB_Notify command, generated by the AFU, will attempt to
wake-up the host thread identified by the particular LPID:PID:TID.

This patch assign a unique TIDR (thread id) for the current thread which
will be used in the process element entry.

Signed-off-by: Christophe Lombard <redacted>
Reviewed-by: Philippe Bergheaud <redacted>

Reviewed-by: Vaibhav Jain <redacted>