linux-kernel - Re: [PATCH] perf/x86/amd: Do not WARN on every IRQ

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Message-ID: <CAE4VaGDkAcs8v8ReT3ZhimWmMY0MGH0Rsi5GX1C4=-B-81vSYA@mail.gmail.com>
Date:   Thu, 14 Sep 2023 15:50:57 +0200
From:   Jirka Hladky <jhladky@...hat.com>
To:     Breno Leitao <leitao@...ian.org>
Cc:     Sandipan Das <sandipan.das@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, leit@...com,
        dcostantino@...a.com,
        "open list:PERFORMANCE EVENTS SUBSYSTEM" 
        <linux-perf-users@...r.kernel.org>,
        "open list:PERFORMANCE EVENTS SUBSYSTEM" 
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf/x86/amd: Do not WARN on every IRQ

Thank you, all!

I have confirmed that the latest microcode fixes the issue.

=============================================
cat /proc/cpuinfo
microcode       : 0xaa00212

perf top runs fine, without any kernel warnings
=============================================

Jirka


On Thu, Sep 14, 2023 at 2:22 PM Breno Leitao <leitao@...ian.org> wrote:
>
> On Thu, Sep 14, 2023 at 04:52:13PM +0530, Sandipan Das wrote:
> > On 9/14/2023 4:48 PM, Peter Zijlstra wrote:
> > > On Thu, Sep 14, 2023 at 02:30:43AM -0700, Breno Leitao wrote:
> > >> On Thu, Sep 14, 2023 at 11:12:34AM +0200, Peter Zijlstra wrote:
> > >>> On Thu, Sep 14, 2023 at 02:25:40PM +0530, Sandipan Das wrote:
> > >>
> > >>>> I agree with using WARN_ON_ONCE() to make this less intrusive.
> > >>>
> > >>> Could you send a patch that AMD is happy with?
> > >>
> > >> Why the current patch is not good enough?
> > >
> > > Sandipan, can you answer this? I don't tihnk I'm qualified to speak for
> > > the AMD pmu and certainly I don't have insight into their design future.
> >
> > Hi Breno,
> >
> > Functionally, the patch looks good to me and I will be reusing it
> > without any change to the authorship. However, as Peter suggested, I
> > wanted to add a message to prompt users to update the microcode and
> > also call out the required patch levels in the commit message since
> > different Zen 4 variants and steppings use different microcode.
> >
> > Here's what I plan to send.
>
> Awesome. Thanks for addressing it.
>


-- 
-Jirka