linux-kernel - Re: [PATCH v3 2/2] [WIP] tools/power turbostat: Also read package power on AMD F17h (Zen)

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Date:   Wed, 20 Mar 2019 19:36:55 -0400
From:   Len Brown <lenb@...nel.org>
To:     Calvin Walton <calvin.walton@...stin.ca>
Cc:     Linux PM list <linux-pm@...r.kernel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] [WIP] tools/power turbostat: Also read package
 power on AMD F17h (Zen)

Hi Calvin,
I'm inclined to apply this -- because it will not break anything,
and it would at least enable testing by people, who have this hardware.

thoughts?
-Len

On Fri, Aug 17, 2018 at 12:35 PM Calvin Walton <calvin.walton@...stin.ca> wrote:
>
> The package power can also be read from an MSR. It's not clear exactly
> what is included, and whether it's aggregated over all nodes or
> reported separately.
>
> It does look like this is reported separately per CCX (I get a single
> value on the Ryzen R7 1700), but it might be reported separately per-
> die (node?) on larger processors. If that's the case, it would have to
> be recorded per node and aggregated for the socket.
>
> Note that although Zen has these MSRs reporting power, it looks like
> the actual RAPL configuration (power limits, configured TDP) is done
> through PCI configuration space. I have not yet found any public
> documentation for this.
>
> Signed-off-by: Calvin Walton <calvin.walton@...stin.ca>
> ---
>  tools/power/x86/turbostat/turbostat.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
> index 89d4e2e75774..675c894b8595 100644
> --- a/tools/power/x86/turbostat/turbostat.c
> +++ b/tools/power/x86/turbostat/turbostat.c
> @@ -1973,6 +1973,11 @@ int get_counters(struct thread_data *t, struct core_data *c, struct pkg_data *p)
>                         return -16;
>                 p->rapl_dram_perf_status = msr & 0xFFFFFFFF;
>         }
> +       if (do_rapl & RAPL_AMD_F17H) {
> +               if (get_msr(cpu, MSR_PKG_ENERGY_STAT, &msr))
> +                       return -13;
> +               p->energy_pkg = msr & 0xFFFFFFFF;
> +       }
>         if (DO_BIC(BIC_PkgTmp)) {
>                 if (get_msr(cpu, MSR_IA32_PACKAGE_THERM_STATUS, &msr))
>                         return -17;
> @@ -3986,10 +3991,13 @@ void rapl_probe_amd(unsigned int family, unsigned int model)
>         switch (family) {
>         case 0x17: /* Zen, Zen+ */
>                 do_rapl = RAPL_AMD_F17H | RAPL_PER_CORE_ENERGY;
> -               if (rapl_joules)
> +               if (rapl_joules) {
> +                       BIC_PRESENT(BIC_Pkg_J);
>                         BIC_PRESENT(BIC_Cor_J);
> -               else
> +               } else {
> +                       BIC_PRESENT(BIC_PkgWatt);
>                         BIC_PRESENT(BIC_CorWatt);
> +               }
>                 break;
>         default:
>                 return;
> --
> 2.18.0
>


-- 
Len Brown, Intel Open Source Technology Center