linux-kernel - Re: [PATCH 08/11] powercap/intel_rapl: Support multi-die/package

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Date:   Tue, 19 Feb 2019 10:10:54 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Len Brown <lenb@...nel.org>
Cc:     "the arch/x86 maintainers" <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Len Brown <len.brown@...el.com>,
        Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 08/11] powercap/intel_rapl: Support multi-die/package

On Tue, Feb 19, 2019 at 4:40 AM Len Brown <lenb@...nel.org> 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.
>
> On the hardwares that do not have multi-die, topology_unique_die_id()
> equals topology_physical_package_id(), thus there is no functional change.
>
> Signed-off-by: Zhang Rui <rui.zhang@...el.com>
> Signed-off-by: Len Brown <len.brown@...el.com>
> Cc: linux-pm@...r.kernel.org
> Signed-off-by: Len Brown <len.brown@...el.com>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

> ---
>  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..e004707283da 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_unique_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_unique_die_id(cpu);
>         struct rapl_package *rp;
>         int ret;
>
> --
> 2.18.0-rc0
>