Hi Nick,
On 7/13/20 11:22 AM, Nicholas Piggin wrote:
Excerpts from Pratik Rajesh Sampat's message of July 10, 2020 3:22 pm:
Additional registers DAWR0, DAWRX0 may be lost on Power 10 for
stop levels < 4.
Therefore save the values of these SPRs before entering a "stop"
state and restore their values on wakeup.
Hmm, where do you get this from? Documentation I see says DAWR is lost
on POWER9 but not P10.
Does idle thread even need to save DAWR, or does it get switched when
going to a thread that has a watchpoint set?
I don't know how idle states works internally but IIUC, we need to save/restore
DAWRs. This is needed when user creates per-cpu watchpoint event.
Ravi
