linux-kernel - Re: [PATCH] powercap: intel

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Date:	Thu, 17 Mar 2016 23:51:00 +0100
From:	Borislav Petkov <bp@...e.de>
To:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc:	rjw@...ysocki.net, linux-pm@...r.kernel.org, mingo@...hat.com,
	tglx@...utronix.de, x86@...nel.org, hpa@...or.com,
	linux-kernel@...r.kernel.org, jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH] powercap: intel_rapl: PSys support

On Thu, Mar 17, 2016 at 03:23:29PM -0700, Srinivas Pandruvada wrote:
> Skylake processor supports a new set of RAPL registers for controlling
> entire platform instead of just CPU package. This is useful for thermal
> and power control when source of power/thermal is not just CPU/GPU.
> This change adds a new platform domain (AKA PSys) to the current
> power capping Intel RAPL driver.
> PSys also supports PL1 (long term) and PL2 (short term) control like
> package domain. This also follows same MSRs for energy and time
> units as package domain.
> Unlike package domain, PSys support requires more than just processor
> level implementation. The other parts in the system need additional
> implementation, which OEMs needs to support. So not all Skylake
> systems will support PSys.
> 
> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> ---
>  arch/x86/include/asm/msr-index.h |  3 ++
>  drivers/powercap/intel_rapl.c    | 63 ++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 66 insertions(+)
> 
> diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
> index 2da46ac..bd383f5 100644
> --- a/arch/x86/include/asm/msr-index.h
> +++ b/arch/x86/include/asm/msr-index.h
> @@ -190,6 +190,9 @@
>  #define MSR_PP1_ENERGY_STATUS		0x00000641
>  #define MSR_PP1_POLICY			0x00000642
>  
> +#define MSR_PLATFORM_ENERGY_STATUS	0x0000064d
> +#define MSR_PLATFORM_POWER_LIMIT	0x0000065c

Please add those defines to intel_rapl.c as they're being used only
there, apparently.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--