linux-kernel - Re: [PATCH v3 19/20] perf arm_spe: Decode memory tagging properties

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Date:   Sat, 24 Oct 2020 01:32:37 +0100
From:   André Przywara <andre.przywara@....com>
To:     Leo Yan <leo.yan@...aro.org>,
        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>,
        Wei Li <liwei391@...wei.com>,
        James Clark <james.clark@....com>, Al Grant <Al.Grant@....com>,
        Dave Martin <Dave.Martin@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 19/20] perf arm_spe: Decode memory tagging properties

On 22/10/2020 15:58, Leo Yan wrote:

Hi,

> 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 c1a3b0afd1de..74ac12cbec69 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
> @@ -432,6 +432,7 @@ 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;
>  
>  	switch (idx) {
> @@ -448,9 +449,12 @@ 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(&buf, &buf_len,
> -					    "PA 0x%llx ns=%d", payload, ns);
> +					    "PA 0x%llx ns=%d ch=%d, pat=%x",
> +					    payload, ns, ch, pat);
>  	default:
>  		return 0;
>  	}
> diff --git a/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.h b/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.h
> index 31dbb8c0fde3..d69af0d618ea 100644
> --- a/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.h
> +++ b/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.h
> @@ -75,6 +75,8 @@ struct arm_spe_pkt {
>  
>  #define SPE_ADDR_PKT_GET_NS(v)			(((v) & BIT(63)) >> 63)
>  #define SPE_ADDR_PKT_GET_EL(v)			(((v) & GENMASK_ULL(62, 61)) >> 61)
> +#define SPE_ADDR_PKT_GET_CH(v)			(((v) & BIT(62)) >> 62)

You need BIT_ULL() here to make this work on 32-bit systems.

Cheers,
Andre

> +#define SPE_ADDR_PKT_GET_PAT(v)			(((v) & GENMASK_ULL(59, 56)) >> 56)
>  
>  #define SPE_ADDR_PKT_EL0			0
>  #define SPE_ADDR_PKT_EL1			1
>