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

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Date:   Fri, 28 Feb 2020 11:00:45 -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": "ls_pref_instr_disp.prefetch_nta",
> > +    "EventCode": "0x4b",
> > +    "BriefDescription": "Software Prefetch Instructions (PREFETCHNTA instruction) Dispatched.",
> > +    "PublicDescription": "Software Prefetch Instructions (PREFETCHNTA instruction) Dispatched.",
> > +    "UMask": "0x4"
> > +  },
> > +  {
> > +    "EventName": "ls_pref_instr_disp.store_prefetch_w",
> > +    "EventCode": "0x4b",
> > +    "BriefDescription": "Software Prefetch Instructions (3DNow PREFETCHW instruction) Dispatched.",
> > +    "PublicDescription": "Software Prefetch Instructions (3DNow PREFETCHW instruction) Dispatched.",
> > +    "UMask": "0x2"
> > +  },
> > +  {
> > +    "EventName": "ls_pref_instr_disp.load_prefetch_w",
> > +    "EventCode": "0x4b",
> > +    "BriefDescription": "Prefetch, Prefetch_T0_T1_T2.",
> > +    "PublicDescription": "Software Prefetch Instructions Dispatched. Prefetch, Prefetch_T0_T1_T2.",
> > +    "UMask": "0x1"
> > +  },
These three are present in the PPR for model 71h (56176 Rev 3.06 - Jul
17, 2019) but are missing from the PPR for model 31h (55803 Rev 0.54 -
Sep 12, 2019). Not sure what to do about it. 

Similarly, PMC 0x0AF - Dispatch Resource Stall Cycles 0 only has one
subcounter in the model 31h PPR, whereas the PPR for 71h is the one that
contains the eight subcounters we see in the mainline right now.

There could be more subtle differences like these, since I have not
really compared the PPR versions that thoroughly. I was going with the
assumption that since both are for SoCs based on the Zen2, they would
have identical events. 

Otherwise, I have made all the other changes and corrections, and will
send in v3 after you suggest how to proceed about the above two.

Best,
Vijay