Subject: Re: [PATCH 0/4] perf arm_spe: Dump IMPDEF events

From: Namhyung Kim <[email-masked]>
Date: Mon, 6 Apr 2026 11:18:09 -0700

Hi James,

On Wed, Apr 01, 2026 at 03:25:48PM +0100, James Clark wrote:
> In the Arm SPE raw data dump, IMPDEF events aren't printed. Add the
> ability to add names for some known events or print the raw event number
> for unknown events.
> 
> For example:
> 
>   $ perf report -D
> 
>   ... ARM SPE data: size 0xd000 bytes
>   00000000: b0 18 c6 32 80 00 80 ff a0  PC 0xff80008032c618 el1 ns=1
>   00000009: 64 e7 42 00 00              CONTEXT 0x42e7 el1
>   0000000e: 00 00 00 00 00              PAD
>   00000013: 49 00                       LD GP-REG
>   00000015: 52 16 10               	EV RETIRED L1D-ACCESS TLB-ACCESS
> 
> On N1 the event line becomes:
> 
>   00000015: 52 16 10                    EV RETIRED L1D-ACCESS TLB-ACCESS LATE-PREFETCH
> 
> Or on other cores it becomes:
> 
>   00000015: 52 16 10                    EV RETIRED L1D-ACCESS TLB-ACCESS IMPDEF:12
> 
> Signed-off-by: James Clark <[email-masked]>
> ---
> James Clark (4):
>       perf arm_spe: Make a function to get the MIDR
>       perf arm_spe: Turn event name mappings into an array
>       perf arm_spe: Decode Arm N1 IMPDEF events
>       perf arm_spe: Print remaining IMPDEF event numbers

Will you send v2 or do you think it's ok to merge v1?

Thanks,
Namhyung

> 
>  tools/perf/util/arm-spe-decoder/Build              |   2 +
>  .../util/arm-spe-decoder/arm-spe-pkt-decoder.c     | 147 ++++++++++++++-------
>  .../util/arm-spe-decoder/arm-spe-pkt-decoder.h     |   5 +-
>  tools/perf/util/arm-spe.c                          |  49 ++++---
>  4 files changed, 135 insertions(+), 68 deletions(-)
> ---
> base-commit: 74e2dbe7be5037a5e5eed6bc1ad562747ac88566
> change-id: 20260331-james-spe-impdef-decode-d944f4fdcff7
> 
> Best regards,
> -- 
> James Clark <[email-masked]>
>