linux-kernel - Re: [PATCH v6 20/21] perf arm_spe: Decode memory tagging properties

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Date:   Tue, 3 Nov 2020 12:14:07 +0000
From:   Dave Martin <Dave.Martin@....com>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <Mark.Rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andre Przywara <Andre.Przywara@....com>,
        James Clark <James.Clark@....com>, Al Grant <Al.Grant@....com>,
        Wei Li <liwei391@...wei.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 20/21] perf arm_spe: Decode memory tagging properties

On Tue, Nov 03, 2020 at 06:51:01AM +0000, Leo Yan wrote:
> On Mon, Nov 02, 2020 at 04:25:36PM +0000, Dave Martin wrote:
> > On Fri, Oct 30, 2020 at 02:57:23AM +0000, Leo Yan wrote:
> > > From: Andre Przywara <andre.przywara@....com>
> > > 
> > > When SPE records a physical address, it can additionally tag the event
> > > with information from the Memory Tagging architecture extension.
> > > 
> > > Decode the two additional fields in the SPE event payload.
> > > 
> > > [leoy: Refined patch to use predefined macros]
> > > 
> > > Signed-off-by: Andre Przywara <andre.przywara@....com>
> > > Signed-off-by: Leo Yan <leo.yan@...aro.org>
> > > ---
> > >  tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c | 6 +++++-
> > >  tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.h | 2 ++
> > >  2 files changed, 7 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c b/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c
> > > index 3fca65e9cbbf..9ec3057de86f 100644
> > > --- a/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c
> > > +++ b/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c
> > > @@ -371,6 +371,7 @@ static int arm_spe_pkt_desc_addr(const struct arm_spe_pkt *packet,
> > >  				 char *buf, size_t buf_len)
> > >  {
> > >  	int ns, el, idx = packet->index;
> > > +	int ch, pat;
> > >  	u64 payload = packet->payload;
> > >  	int err = 0;
> > >  
> > > @@ -388,9 +389,12 @@ static int arm_spe_pkt_desc_addr(const struct arm_spe_pkt *packet,
> > >  					    "VA 0x%llx", payload);
> > >  	case SPE_ADDR_PKT_HDR_INDEX_DATA_PHYS:
> > >  		ns = !!SPE_ADDR_PKT_GET_NS(payload);
> > > +		ch = !!SPE_ADDR_PKT_GET_CH(payload);
> > > +		pat = SPE_ADDR_PKT_GET_PAT(payload);
> > >  		payload = SPE_ADDR_PKT_ADDR_GET_BYTES_0_6(payload);
> > >  		return arm_spe_pkt_snprintf(&err, &buf, &buf_len,
> > > -					    "PA 0x%llx ns=%d", payload, ns);
> > > +					    "PA 0x%llx ns=%d ch=%d, pat=%x",
> > 
> > Nit: given that this data is all closely related, do we really want the
> > extra comma here?
> 
> No reason for adding comma.  Will remove it.

OK, I'm happy for my Reviewed-by to stand.

[...]

Cheers
---Dave