[PATCH 4/4] perf arm_spe: Print remaining IMPDEF event numbers

[Leo Yan]

On Wed, Apr 01, 2026 at 03:25:52PM +0100, James Clark wrote:
> Any IMPDEF events not printed out from a known core's IMPDEF list or for
> a completely unknown core will still not be shown to the user. Fix this
> by printing the remaining bits as comma separated raw numbers, e.g.
> "IMPDEF:1,2,3,4".
> 
> Suggested-by: Al Grant <al.grant at arm.com>
> Signed-off-by: James Clark <james.clark at linaro.org>
> ---
>  tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> 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 42a7501d4dfe..b93712ce0aca 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
> @@ -364,6 +364,24 @@ static int arm_spe_pkt_desc_event(const struct arm_spe_pkt *packet,
>  						   payload);
>  	}
>  
> +	/*
> +	 * Print remaining IMPDEF bits that weren't printed above as raw
> +	 * "IMPDEF:1,2,3,4" etc.
> +	 */
> +	if (payload) {
> +		arm_spe_pkt_out_string(&err, &buf, &buf_len, " IMPDEF:",
> +				       payload);
> +		for (int i = 0; i < 64; i++) {

Nitpick: use for_each_set_bit(i, &payload, 64) instead.

> +			const char *sep = payload & (payload - 1) ? "," : "";
> +
> +			if (payload & BIT(i)) {
> +				arm_spe_pkt_out_string(&err, &buf, &buf_len,
> +						       "%d%s", i, sep);
> +				payload &= ~BIT(i);
> +			}
> +		}
> +	}
> +
>  	return err;
>  }
>  
> 
> -- 
> 2.34.1
> 
>