linux-kernel - Re: [PATCH 10/22] powercap/intel_rapl: Support multi-die/package

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Date:   Tue, 7 May 2019 14:14:59 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Len Brown <lenb@...nel.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Zhang Rui <rui.zhang@...el.com>,
        Len Brown <len.brown@...el.com>, linux-pm@...r.kernel.org
Subject: Re: [PATCH 10/22] powercap/intel_rapl: Support multi-die/package

On Mon, May 06, 2019 at 05:26:05PM -0400, Len Brown wrote:
> From: Zhang Rui <rui.zhang@...el.com>
> 
> RAPL "package" domains are actually implemented in hardware per-die.
> Thus, the new multi-die/package systems have mulitple domains
> within each physical package.
> 
> Update the intel_rapl driver to be "die aware" -- exporting multiple
> domains within a single package, when present.
> No change on single die/package systems.
> 
> 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 3c3c0c23180b..9202dbcef96d 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_domain(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) {
> @@ -1459,7 +1459,7 @@ 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;

Both functions are still misnomers. rapl_find_package_domain() does in
fact now do rapl_find_die_domain(), right? Same for rapl_add_package()