linux-kernel - Re: [PATCH] Documentation: admin-guide: pm: Add Out of Band mode

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Message-ID: <19189e1c806bf812e41a400e826c5e23892900e0.camel@linux.intel.com>
Date:   Mon, 23 May 2022 11:00:29 -0700
From:   srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     Jonathan Corbet <corbet@....net>, rafael@...nel.org,
        hdegoede@...hat.com, markgross@...nel.org
Cc:     lenb@...nel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-doc@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, prarit@...hat.com
Subject: Re: [PATCH] Documentation: admin-guide: pm: Add Out of Band mode

On Mon, 2022-05-23 at 11:46 -0600, Jonathan Corbet wrote:
> Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com> writes:
> 
> > Update documentation for using the tool to support performance
> > level
> > change via OOB (Out of Band) interface.
> > 
> > Signed-off-by: Srinivas Pandruvada
> > <srinivas.pandruvada@...ux.intel.com>
> > ---
> >  .../admin-guide/pm/intel-speed-select.rst     | 19
> > +++++++++++++++++++
> >  1 file changed, 19 insertions(+)
> > 
> > diff --git a/Documentation/admin-guide/pm/intel-speed-select.rst
> > b/Documentation/admin-guide/pm/intel-speed-select.rst
> > index 0a1fbdb54bfe..4146a2da35ea 100644
> > --- a/Documentation/admin-guide/pm/intel-speed-select.rst
> > +++ b/Documentation/admin-guide/pm/intel-speed-select.rst
> > @@ -262,6 +262,25 @@ Which shows that the base frequency now
> > increased from 2600 MHz at performance
> >  level 0 to 2800 MHz at performance level 4. As a result, any
> > workload, which can
> >  use fewer CPUs, can see a boost of 200 MHz compared to performance
> > level 0.
> >  
> > +Changing performance level via BMC Interface
> > +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > +
> > +It is possible to change SST-PP level using out of band (OOB)
> > agent (Via some
> > +remote management console, through BMC "Baseboard Management
> > Controller"
> > +interface). This mode is supported from the Sapphire Rapids
> > processor
> > +generation. The kernel and tool change to support this mode is
> > added to Linux
> > +kernel version 5.18. To enable this feature, kernel config
> > +"CONFIG_INTEL_HFI_THERMAL" is required. The minimum version of the
> > tool
> > +is "v1.12" to support this feature, which is part of Linux kernel
> > version 5.18.
> > +
> > +To support such configuration, this tool can be used as a daemon.
> > Add
> > +a command line option --oob::
> > +
> > +# intel-speed-select --oob
> > +
> 
> This suggests you haven't actually built the documentation with your
> change and verified that you got the result you were after.
You mean I should print the result with the command? Something like
this:
#intel-speed-select --oob
Intel(R) Speed Select Technology
OOB mode is enabled and will run as daemon


>   Literal
> blocks need to be indented.
I will submit v2.

Thanks,
Srinivas

> 
> Thanks,
> 
> jon