linux-kernel - Re: [PATCH v3 18/20] perf arm-spe: Add more sub classes for operation packet

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Date:   Sat, 24 Oct 2020 01:32:27 +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 18/20] perf arm-spe: Add more sub classes for operation
 packet

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

Hi,

> For the operation type packet payload with load/store class, it misses
> to support these sub classes:
> 
>   - A load/store targeting the general-purpose registers;
>   - A load/store targeting unspecified registers;
>   - The ARMv8.4 nested virtualisation extension can redirect system
>     register accesses to a memory page controlled by the hypervisor.
>     The SPE profiling feature in newer implementations can tag those
>     memory accesses accordingly.
> 
> Add the bit pattern describing load/store sub classes, so that the perf
> tool can decode it properly.
> 
> Inspired by Andre Przywara, refined the commit log and code for more
> clear description.
> 
> Co-developed-by: Andre Przywara <andre.przywara@....com>
> Signed-off-by: Leo Yan <leo.yan@...aro.org>

Reviewed-by: Andre Przywara <andre.przywara@....com>

Cheers,
Andre

> ---
>  .../arm-spe-decoder/arm-spe-pkt-decoder.c     | 28 +++++++++++++++++--
>  1 file changed, 26 insertions(+), 2 deletions(-)
> 
> 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 59b538563d31..c1a3b0afd1de 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
> @@ -370,11 +370,35 @@ static int arm_spe_pkt_desc_op_type(const struct arm_spe_pkt *packet,
>  				if (ret < 0)
>  					return ret;
>  			}
> -		} else if (SPE_OP_PKT_LDST_SUBCLASS_GET(payload) ==
> -					SPE_OP_PKT_LDST_SUBCLASS_SIMD_FP) {
> +		}
> +
> +		switch (SPE_OP_PKT_LDST_SUBCLASS_GET(payload)) {
> +		case SPE_OP_PKT_LDST_SUBCLASS_SIMD_FP:
>  			ret = arm_spe_pkt_snprintf(&buf, &blen, " SIMD-FP");
>  			if (ret < 0)
>  				return ret;
> +
> +			break;
> +		case SPE_OP_PKT_LDST_SUBCLASS_GP_REG:
> +			ret = arm_spe_pkt_snprintf(&buf, &blen, " GP-REG");
> +			if (ret < 0)
> +				return ret;
> +
> +			break;
> +		case SPE_OP_PKT_LDST_SUBCLASS_UNSPEC_REG:
> +			ret = arm_spe_pkt_snprintf(&buf, &blen, " UNSPEC-REG");
> +			if (ret < 0)
> +				return ret;
> +
> +			break;
> +		case SPE_OP_PKT_LDST_SUBCLASS_NV_SYSREG:
> +			ret = arm_spe_pkt_snprintf(&buf, &blen, " NV-SYSREG");
> +			if (ret < 0)
> +				return ret;
> +
> +			break;
> +		default:
> +			break;
>  		}
>  
>  		return buf_len - blen;
>