linux-kernel - Re: [PATCH 08/14] powercap/intel_rapl: Support multi-die/package

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Date:   Mon, 08 Apr 2019 09:35:47 +0800
From:   Zhang Rui <rui.zhang@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>, Len Brown <lenb@...nel.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Len Brown <len.brown@...el.com>, linux-pm@...r.kernel.org
Subject: Re: [PATCH 08/14] powercap/intel_rapl: Support multi-die/package

On 五, 2019-04-05 at 20:27 +0200, Thomas Gleixner wrote:
> On Tue, 26 Feb 2019, Len Brown wrote:
> 
> > 
> > From: Zhang Rui <rui.zhang@...el.com>
> > 
> > On the new dual-die/package systems, the RAPL MSR becomes die-
> > scope.
> > Thus instead of one powercap device per physical package, now there
> > should be one powercap device for each unique die on these systems.
> > 
> > This patch introduces intel_rapl driver support for new
> > dual-die/package systems.
> This patch .... See Documentation/processs/
> 
> and this sentence is not really helpful either.
> 
> > 
> > On the hardwares that do not have multi-die,
> > topology_logical_die_id()
> > equals topology_physical_package_id(), thus there is no functional
> > change.
> Something like this:
> 
> To support this the RAPL package domain has to be identified by the
> die id
> instead of the package id. On single die CPUs the die id is the same
> as the
> physical package id.
> 
> Hmm?

Yeah, sounds much better.
Len, will you help me update the changelog or do you want me to send an
updated version to you?

thanks,
rui

> 
> > 
> > Signed-off-by: Zhang Rui <rui.zhang@...el.com>
> > Signed-off-by: Len Brown <len.brown@...el.com>
> > Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > Cc: linux-pm@...r.kernel.org
> > ---
> >  drivers/powercap/intel_rapl.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/powercap/intel_rapl.c
> > b/drivers/powercap/intel_rapl.c
> > index 6057d9695fed..8723e9ae7436 100644
> > --- a/drivers/powercap/intel_rapl.c
> > +++ b/drivers/powercap/intel_rapl.c
> > @@ -266,7 +266,7 @@ static struct rapl_domain
> > *platform_rapl_domain; /* Platform (PSys) domain */
> >  /* caller to ensure CPU hotplug lock is held */
> >  static struct rapl_package *rapl_find_package(int cpu)
> >  {
> > -	int id = topology_physical_package_id(cpu);
> > +	int id = topology_logical_die_id(cpu);
> >  	struct rapl_package *rp;
> >  
> >  	list_for_each_entry(rp, &rapl_packages, plist) {
> > @@ -1457,7 +1457,7 @@ static void rapl_remove_package(struct
> > rapl_package *rp)
> >  /* called from CPU hotplug notifier, hotplug lock held */
> >  static struct rapl_package *rapl_add_package(int cpu)
> >  {
> > -	int id = topology_physical_package_id(cpu);
> > +	int id = topology_logical_die_id(cpu);
> >  	struct rapl_package *rp;
> >  	int ret;
> >