Re: [PATCH v6 3/7] perf jevents: Support more event fields

[John Garry]

On 07/08/2023 08:51, Jing Zhang wrote:
> The usual event descriptions are "event=xxx" or "config=xxx", while the
> event descriptions of CMN are "type=xxx, eventid=xxx" or more complex.
>
> $cat /sys/bus/event_source/devices/arm_cmn_0/events/hnf_cache_fill
> type=0x5,eventid=0x3
>
> When adding aliases for events described as "event=xxx" or "config=xxx",
> EventCode or ConfigCode can be used in the JSON files to describe the
> events. But "eventid=xxx, type=xxx" cannot be supported at present.
>
> If EventCode and ConfigCode is not added in the alias JSON file, the
> event description will add "event=0" by default. So, even if the event
> field is added to supplement "eventid=xxx" and "type=xxx", the final
> parsing result will be "event=0, eventid=xxx, type=xxx".
>
> Therefore, when EventCode and ConfigCode are missing in JSON, "event=0" is
> no longer added by default. EventIdCode and Type are added to the event
> field, and ConfigCode is moved into the event_field array which can also
> guarantee its original function.
>
> Signed-off-by: Jing Zhang <renyu.zj@xxxxxxxxxxxxxxxxx>

I'll let Ian check this change as he is more familiar with this code.

Thanks