linux-kernel - Re: [PATCH v2 2/3] perf vendor events amd: add Zen2 events

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Date:   Fri, 28 Feb 2020 12:34:19 -0500
From:   Vijay Thakkar <vijaythakkar@...com>
To:     Kim Phillips <kim.phillips@....com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Martin Liška <mliska@...e.cz>,
        Jon Grimm <jon.grimm@....com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v2 2/3] perf vendor events amd: add Zen2 events

> > +  {
> > +    "EventName": "de_dis_dispatch_token_stalls0.sc_agu_dispatch_stall",
> > +    "EventCode": "0xaf",
> > +    "BriefDescription": "SC AGU dispatch stall.",
> > +    "PublicDescription": "Cycles where a dispatch group is valid but does not get dispatched due to a token stall. RETIRE Tokens unavailable.",
> > +    "UMask": "0x80"
> > +  },
> 
> All the above Public descriptions have "RETIRE Tokens unavailable." 
> yet their BriefDescriptions are different.  Please fix.

Just noticed that this one is not present at all in PPR 56176 Rev 3.06 - Jul
17, 2019 and that the umasks for the rest of the sub-counters in PMC0xAF
are right shifted by one when compared to those in Zen1. As a result,
the previous counter at umask 0x1 is no longer present.

I will update this counter to reflect what is documented in model 71h PPR 56176 Rev
3.06 - Jul 17, 2019.

-Vijay