linux-kernel - Re: [PATCH v2 0/3] Power10 basic energy management

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Date:   Mon, 13 Jul 2020 16:18:37 +0530
From:   Gautham R Shenoy <ego@...ux.vnet.ibm.com>
To:     Nicholas Piggin <npiggin@...il.com>
Cc:     benh@...nel.crashing.org, ego@...ux.vnet.ibm.com,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        mikey@...ling.org, mpe@...erman.id.au, paulus@...ba.org,
        pratik.r.sampat@...il.com,
        Pratik Rajesh Sampat <psampat@...ux.ibm.com>,
        ravi.bangoria@...ux.ibm.com, svaidy@...ux.ibm.com
Subject: Re: [PATCH v2 0/3] Power10 basic energy management

On Mon, Jul 13, 2020 at 03:23:21PM +1000, Nicholas Piggin wrote:
> Excerpts from Pratik Rajesh Sampat's message of July 10, 2020 3:22 pm:
> > Changelog v1 --> v2:
> > 1. Save-restore DAWR and DAWRX unconditionally as they are lost in
> > shallow idle states too
> > 2. Rename pnv_first_spr_loss_level to pnv_first_fullstate_loss_level to
> > correct naming terminology
> > 
> > Pratik Rajesh Sampat (3):
> >   powerpc/powernv/idle: Exclude mfspr on HID1,4,5 on P9 and above
> >   powerpc/powernv/idle: save-restore DAWR0,DAWRX0 for P10
> >   powerpc/powernv/idle: Rename pnv_first_spr_loss_level variable
> > 
> >  arch/powerpc/platforms/powernv/idle.c | 34 +++++++++++++++++----------
> >  1 file changed, 22 insertions(+), 12 deletions(-)
> 
> These look okay to me, but the CPU_FTR_ARCH_300 test for 
> pnv_power9_idle_init() is actually wrong, it should be a PVR test 
> because idle is not completely architected (not even shallow stop 
> states, unfortunately).
> 
> It doesn't look like we support POWER10 idle correctly yet, and on older
> kernels it wouldn't work even if we fixed newer, so ideally the PVR 
> check would be backported as a fix in the front of the series.
> 
> Sadly, we have no OPAL idle driver yet. Hopefully we will before the
> next processor shows up :P

Abhishek posted a version recently :
https://patchwork.ozlabs.org/project/skiboot/patch/20200706043533.76539-1-huntbag@linux.vnet.ibm.com/


> 
> Thanks,
> Nick

--
Thanks and Regards
gautham.