linux-kernel - Re: [PATCH v2] tools/power turbostat: Fix RAPL summary collection on AMD processors

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Message-ID: <a5637148-7a21-e4e1-a4e7-c470bbb3bfe0@gmx.com>
Date:   Tue, 20 Apr 2021 14:06:04 +0000
From:   "Artem S. Tashkinov" <aros@....com>
To:     Chen Yu <yu.c.chen@...el.com>, Borislav Petkov <bp@...e.de>
Cc:     Terry Bowman <terry.bowman@....com>, lenb@...nel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        calvin.walton@...stin.ca, wei.huang2@....com
Subject: Re: [PATCH v2] tools/power turbostat: Fix RAPL summary collection on
 AMD processors

On 4/20/21 1:15 PM, Chen Yu wrote:
> On Tue, Apr 20, 2021 at 10:07:01AM +0200, Borislav Petkov wrote:
>> On Tue, Apr 20, 2021 at 10:03:36AM +0800, Chen Yu wrote:
>>> On Mon, Apr 19, 2021 at 02:58:12PM -0500, Terry Bowman wrote:
>>>> Turbostat fails to correctly collect and display RAPL summary information
>>>> on Family 17h and 19h AMD processors. Running turbostat on these processors
>>>> returns immediately. If turbostat is working correctly then RAPL summary
>>>> data is displayed until the user provided command completes. If a command
>>>> is not provided by the user then turbostat is designed to continuously
>>>> display RAPL information until interrupted.
>>>>
>>>> The issue is due to offset_to_idx() and idx_to_offset() missing support for
>>>> AMD MSR addresses/offsets. offset_to_idx()'s switch statement is missing
>>>> cases for AMD MSRs and idx_to_offset() does not include a path to return
>>>> AMD MSR(s) for any idx.
>>>>
>>>> The solution is add AMD MSR support to offset_to_idx() and idx_to_offset().
>>>> These functions are split-out and renamed along architecture vendor lines
>>>> for supporting both AMD and Intel MSRs.
>>>>
>>>> Fixes: 9972d5d84d76 ("tools/power turbostat: Enable accumulate RAPL display")
>>>> Signed-off-by: Terry Bowman <terry.bowman@....com>
>>> Thanks for fixing, Terry, and previously there was a patch for this from Bas Nieuwenhuizen:
>>> https://lkml.org/lkml/2021/3/12/682
>>> and it is expected to have been merged in Len's branch already.
>>
>> Expected?
>>
>> So is it or is it not?
>>
> This patch was sent to Len and it is not in public repo yet. He is preparing for a new
> release of turbostat as merge window is approaching.
>> And can you folks agree on a patch already and give it to Artem for
>> testing (CCed) because he's triggering it too:
>>
>> https://bugzilla.kernel.org/show_bug.cgi?id=212357
>>
> Okay. I would vote for the the patch from Bas as it was a combined work from two
> authors and tested by several AMD users. But let me paste it here too for Artem to
> see if this also works for him:
>
>
>  From 00e0622b1b693a5c7dc343aeb3aa51614a9e125e Mon Sep 17 00:00:00 2001
> From: Bas Nieuwenhuizen <bas@...nieuwenhuizen.nl>
> Date: Fri, 12 Mar 2021 21:27:40 +0800
> Subject: [PATCH] tools/power/turbostat: Fix turbostat for AMD Zen CPUs
>
> It was reported that on Zen+ system turbostat started exiting,
> which was tracked down to the MSR_PKG_ENERGY_STAT read failing because
> offset_to_idx wasn't returning a non-negative index.
>
> This patch combined the modification from Bingsong Si and
> Bas Nieuwenhuizen and addd the MSR to the index system as alternative for
> MSR_PKG_ENERGY_STATUS.
>
> Fixes: 9972d5d84d76 ("tools/power turbostat: Enable accumulate RAPL display")
> Reported-by: youling257 <youling257@...il.com>
> Tested-by: youling257 <youling257@...il.com>
> Tested-by: sibingsong <owen.si@...oud.cn>
> Tested-by: Kurt Garloff <kurt@...loff.de>
> Co-developed-by: Bingsong Si <owen.si@...oud.cn>
> Signed-off-by: Chen Yu <yu.c.chen@...el.com>
> ---
>   tools/power/x86/turbostat/turbostat.c | 8 ++++++--
>   1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
> index a7c4f0772e53..a7c965734fdf 100644
> --- a/tools/power/x86/turbostat/turbostat.c
> +++ b/tools/power/x86/turbostat/turbostat.c
> @@ -297,7 +297,10 @@ int idx_to_offset(int idx)
>
>   	switch (idx) {
>   	case IDX_PKG_ENERGY:
> -		offset = MSR_PKG_ENERGY_STATUS;
> +		if (do_rapl & RAPL_AMD_F17H)
> +			offset = MSR_PKG_ENERGY_STAT;
> +		else
> +			offset = MSR_PKG_ENERGY_STATUS;
>   		break;
>   	case IDX_DRAM_ENERGY:
>   		offset = MSR_DRAM_ENERGY_STATUS;
> @@ -326,6 +329,7 @@ int offset_to_idx(int offset)
>
>   	switch (offset) {
>   	case MSR_PKG_ENERGY_STATUS:
> +	case MSR_PKG_ENERGY_STAT:
>   		idx = IDX_PKG_ENERGY;
>   		break;
>   	case MSR_DRAM_ENERGY_STATUS:
> @@ -353,7 +357,7 @@ int idx_valid(int idx)
>   {
>   	switch (idx) {
>   	case IDX_PKG_ENERGY:
> -		return do_rapl & RAPL_PKG;
> +		return do_rapl & (RAPL_PKG | RAPL_AMD_F17H);
>   	case IDX_DRAM_ENERGY:
>   		return do_rapl & RAPL_DRAM;
>   	case IDX_PP0_ENERGY:
>

The patch works for me.

Tested-by: Artem S. Tashkinov <aros@....com>